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Commit | Line | Data |
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e184e2be | 1 | // SPDX-License-Identifier: GPL-2.0+ |
ed9eccbe | 2 | /* |
f6fef5df IA |
3 | * comedi/comedi_fops.c |
4 | * comedi kernel module | |
5 | * | |
6 | * COMEDI - Linux Control and Measurement Device Interface | |
e0d0bf8a AV |
7 | * Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org> |
8 | * compat ioctls: | |
9 | * Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk> | |
10 | * Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/> | |
f6fef5df | 11 | */ |
ed9eccbe | 12 | |
c2ad078b HS |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
ed9eccbe DS |
15 | #include <linux/module.h> |
16 | #include <linux/errno.h> | |
17 | #include <linux/kernel.h> | |
174cd4b1 | 18 | #include <linux/sched/signal.h> |
ed9eccbe DS |
19 | #include <linux/fcntl.h> |
20 | #include <linux/delay.h> | |
ed9eccbe DS |
21 | #include <linux/mm.h> |
22 | #include <linux/slab.h> | |
ed9eccbe | 23 | #include <linux/poll.h> |
ed9eccbe | 24 | #include <linux/device.h> |
ed9eccbe DS |
25 | #include <linux/fs.h> |
26 | #include "comedidev.h" | |
27 | #include <linux/cdev.h> | |
28 | ||
476b8477 GKH |
29 | #include <linux/io.h> |
30 | #include <linux/uaccess.h> | |
e0d0bf8a | 31 | #include <linux/compat.h> |
ed9eccbe | 32 | |
3a5fa275 | 33 | #include "comedi_internal.h" |
ed9eccbe | 34 | |
63107ce8 | 35 | /* |
eb340aca | 36 | * comedi_subdevice "runflags" |
63107ce8 IA |
37 | * COMEDI_SRF_RT: DEPRECATED: command is running real-time |
38 | * COMEDI_SRF_ERROR: indicates an COMEDI_CB_ERROR event has occurred | |
eb340aca | 39 | * since the last command was started |
63107ce8 IA |
40 | * COMEDI_SRF_RUNNING: command is running |
41 | * COMEDI_SRF_FREE_SPRIV: free s->private on detach | |
eb340aca | 42 | * |
63107ce8 | 43 | * COMEDI_SRF_BUSY_MASK: runflags that indicate the subdevice is "busy" |
eb340aca IA |
44 | */ |
45 | #define COMEDI_SRF_RT BIT(1) | |
46 | #define COMEDI_SRF_ERROR BIT(2) | |
47 | #define COMEDI_SRF_RUNNING BIT(27) | |
48 | #define COMEDI_SRF_FREE_SPRIV BIT(31) | |
49 | ||
50 | #define COMEDI_SRF_BUSY_MASK (COMEDI_SRF_ERROR | COMEDI_SRF_RUNNING) | |
51 | ||
20f083c0 | 52 | /** |
a3e39942 IA |
53 | * struct comedi_file - Per-file private data for COMEDI device |
54 | * @dev: COMEDI device. | |
55 | * @read_subdev: Current "read" subdevice. | |
56 | * @write_subdev: Current "write" subdevice. | |
57 | * @last_detach_count: Last known detach count. | |
58 | * @last_attached: Last known attached/detached state. | |
20f083c0 IA |
59 | */ |
60 | struct comedi_file { | |
61 | struct comedi_device *dev; | |
62 | struct comedi_subdevice *read_subdev; | |
63 | struct comedi_subdevice *write_subdev; | |
64 | unsigned int last_detach_count; | |
b3c16227 | 65 | unsigned int last_attached:1; |
20f083c0 IA |
66 | }; |
67 | ||
eda56825 | 68 | #define COMEDI_NUM_MINORS 0x100 |
5b7dba1b IA |
69 | #define COMEDI_NUM_SUBDEVICE_MINORS \ |
70 | (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS) | |
eda56825 | 71 | |
d1d78d20 CKC |
72 | static unsigned short comedi_num_legacy_minors; |
73 | module_param(comedi_num_legacy_minors, ushort, 0444); | |
4d7df821 IA |
74 | MODULE_PARM_DESC(comedi_num_legacy_minors, |
75 | "number of comedi minor devices to reserve for non-auto-configured devices (default 0)" | |
76 | ); | |
77 | ||
234bb3c6 | 78 | unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; |
6e302939 | 79 | module_param(comedi_default_buf_size_kb, uint, 0644); |
4d7df821 IA |
80 | MODULE_PARM_DESC(comedi_default_buf_size_kb, |
81 | "default asynchronous buffer size in KiB (default " | |
234bb3c6 | 82 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); |
4d7df821 | 83 | |
642e0692 NK |
84 | unsigned int comedi_default_buf_maxsize_kb = |
85 | CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; | |
6e302939 | 86 | module_param(comedi_default_buf_maxsize_kb, uint, 0644); |
4d7df821 IA |
87 | MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, |
88 | "default maximum size of asynchronous buffer in KiB (default " | |
234bb3c6 | 89 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); |
1dd33ab8 | 90 | |
5b7dba1b | 91 | static DEFINE_MUTEX(comedi_board_minor_table_lock); |
cb6b79de | 92 | static struct comedi_device |
5b7dba1b IA |
93 | *comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]; |
94 | ||
95 | static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); | |
96 | /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */ | |
bd5b4173 | 97 | static struct comedi_subdevice |
5b7dba1b | 98 | *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; |
476b8477 | 99 | |
d9740a03 IA |
100 | static struct class *comedi_class; |
101 | static struct cdev comedi_cdev; | |
102 | ||
103 | static void comedi_device_init(struct comedi_device *dev) | |
104 | { | |
5b13ed94 | 105 | kref_init(&dev->refcount); |
d9740a03 IA |
106 | spin_lock_init(&dev->spinlock); |
107 | mutex_init(&dev->mutex); | |
2f3fdcd7 | 108 | init_rwsem(&dev->attach_lock); |
d9740a03 IA |
109 | dev->minor = -1; |
110 | } | |
111 | ||
5b13ed94 IA |
112 | static void comedi_dev_kref_release(struct kref *kref) |
113 | { | |
114 | struct comedi_device *dev = | |
115 | container_of(kref, struct comedi_device, refcount); | |
116 | ||
117 | mutex_destroy(&dev->mutex); | |
8f988d87 | 118 | put_device(dev->class_dev); |
5b13ed94 IA |
119 | kfree(dev); |
120 | } | |
121 | ||
dd630cde | 122 | /** |
a3e39942 IA |
123 | * comedi_dev_put() - Release a use of a COMEDI device |
124 | * @dev: COMEDI device. | |
dd630cde | 125 | * |
a3e39942 IA |
126 | * Must be called when a user of a COMEDI device is finished with it. |
127 | * When the last user of the COMEDI device calls this function, the | |
128 | * COMEDI device is destroyed. | |
dd630cde | 129 | * |
a3e39942 IA |
130 | * Return: 1 if the COMEDI device is destroyed by this call or @dev is |
131 | * NULL, otherwise return 0. Callers must not assume the COMEDI | |
dd630cde IA |
132 | * device is still valid if this function returns 0. |
133 | */ | |
5b13ed94 IA |
134 | int comedi_dev_put(struct comedi_device *dev) |
135 | { | |
136 | if (dev) | |
137 | return kref_put(&dev->refcount, comedi_dev_kref_release); | |
138 | return 1; | |
139 | } | |
b449c1ca IA |
140 | EXPORT_SYMBOL_GPL(comedi_dev_put); |
141 | ||
142 | static struct comedi_device *comedi_dev_get(struct comedi_device *dev) | |
143 | { | |
144 | if (dev) | |
145 | kref_get(&dev->refcount); | |
146 | return dev; | |
147 | } | |
5b13ed94 | 148 | |
d9740a03 IA |
149 | static void comedi_device_cleanup(struct comedi_device *dev) |
150 | { | |
151 | struct module *driver_module = NULL; | |
152 | ||
88cc30cf | 153 | if (!dev) |
d9740a03 IA |
154 | return; |
155 | mutex_lock(&dev->mutex); | |
156 | if (dev->attached) | |
157 | driver_module = dev->driver->module; | |
158 | comedi_device_detach(dev); | |
1363e4fb IA |
159 | if (driver_module && dev->use_count) |
160 | module_put(driver_module); | |
d9740a03 | 161 | mutex_unlock(&dev->mutex); |
d9740a03 IA |
162 | } |
163 | ||
db210da2 IA |
164 | static bool comedi_clear_board_dev(struct comedi_device *dev) |
165 | { | |
166 | unsigned int i = dev->minor; | |
167 | bool cleared = false; | |
168 | ||
77c21b62 | 169 | lockdep_assert_held(&dev->mutex); |
db210da2 IA |
170 | mutex_lock(&comedi_board_minor_table_lock); |
171 | if (dev == comedi_board_minor_table[i]) { | |
172 | comedi_board_minor_table[i] = NULL; | |
173 | cleared = true; | |
174 | } | |
175 | mutex_unlock(&comedi_board_minor_table_lock); | |
176 | return cleared; | |
177 | } | |
178 | ||
d4d47895 | 179 | static struct comedi_device *comedi_clear_board_minor(unsigned int minor) |
d9740a03 | 180 | { |
cb6b79de | 181 | struct comedi_device *dev; |
d9740a03 | 182 | |
5b7dba1b | 183 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de | 184 | dev = comedi_board_minor_table[minor]; |
5b7dba1b IA |
185 | comedi_board_minor_table[minor] = NULL; |
186 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 187 | return dev; |
d9740a03 IA |
188 | } |
189 | ||
cb6b79de | 190 | static void comedi_free_board_dev(struct comedi_device *dev) |
d9740a03 | 191 | { |
cb6b79de | 192 | if (dev) { |
52ef9e7c | 193 | comedi_device_cleanup(dev); |
cb6b79de IA |
194 | if (dev->class_dev) { |
195 | device_destroy(comedi_class, | |
196 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
d9740a03 | 197 | } |
5b13ed94 | 198 | comedi_dev_put(dev); |
d9740a03 IA |
199 | } |
200 | } | |
8ab4ed6e | 201 | |
b2073dcb IA |
202 | static struct comedi_subdevice * |
203 | comedi_subdevice_from_minor(const struct comedi_device *dev, unsigned int minor) | |
5b7dba1b | 204 | { |
bd5b4173 | 205 | struct comedi_subdevice *s; |
5b7dba1b IA |
206 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; |
207 | ||
5b7dba1b | 208 | mutex_lock(&comedi_subdevice_minor_table_lock); |
bd5b4173 | 209 | s = comedi_subdevice_minor_table[i]; |
63ab0395 IA |
210 | if (s && s->device != dev) |
211 | s = NULL; | |
5b7dba1b | 212 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
bd5b4173 | 213 | return s; |
5b7dba1b IA |
214 | } |
215 | ||
d4d47895 | 216 | static struct comedi_device *comedi_dev_get_from_board_minor(unsigned int minor) |
b449c1ca IA |
217 | { |
218 | struct comedi_device *dev; | |
219 | ||
b449c1ca IA |
220 | mutex_lock(&comedi_board_minor_table_lock); |
221 | dev = comedi_dev_get(comedi_board_minor_table[minor]); | |
222 | mutex_unlock(&comedi_board_minor_table_lock); | |
223 | return dev; | |
224 | } | |
225 | ||
b2073dcb IA |
226 | static struct comedi_device * |
227 | comedi_dev_get_from_subdevice_minor(unsigned int minor) | |
b449c1ca IA |
228 | { |
229 | struct comedi_device *dev; | |
230 | struct comedi_subdevice *s; | |
231 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; | |
232 | ||
b449c1ca IA |
233 | mutex_lock(&comedi_subdevice_minor_table_lock); |
234 | s = comedi_subdevice_minor_table[i]; | |
235 | dev = comedi_dev_get(s ? s->device : NULL); | |
236 | mutex_unlock(&comedi_subdevice_minor_table_lock); | |
237 | return dev; | |
238 | } | |
239 | ||
dd630cde | 240 | /** |
a3e39942 IA |
241 | * comedi_dev_get_from_minor() - Get COMEDI device by minor device number |
242 | * @minor: Minor device number. | |
dd630cde | 243 | * |
a3e39942 IA |
244 | * Finds the COMEDI device associated with the minor device number, if any, |
245 | * and increments its reference count. The COMEDI device is prevented from | |
dd630cde IA |
246 | * being freed until a matching call is made to comedi_dev_put(). |
247 | * | |
a3e39942 IA |
248 | * Return: A pointer to the COMEDI device if it exists, with its usage |
249 | * reference incremented. Return NULL if no COMEDI device exists with the | |
dd630cde IA |
250 | * specified minor device number. |
251 | */ | |
d4d47895 | 252 | struct comedi_device *comedi_dev_get_from_minor(unsigned int minor) |
b449c1ca IA |
253 | { |
254 | if (minor < COMEDI_NUM_BOARD_MINORS) | |
255 | return comedi_dev_get_from_board_minor(minor); | |
cb3aadae KH |
256 | |
257 | return comedi_dev_get_from_subdevice_minor(minor); | |
b449c1ca IA |
258 | } |
259 | EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor); | |
260 | ||
43bd33f2 | 261 | static struct comedi_subdevice * |
da56fdc6 | 262 | comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 263 | { |
bd5b4173 | 264 | struct comedi_subdevice *s; |
da56fdc6 | 265 | |
77c21b62 | 266 | lockdep_assert_held(&dev->mutex); |
da56fdc6 | 267 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
63ab0395 | 268 | s = comedi_subdevice_from_minor(dev, minor); |
88cc30cf | 269 | if (!s || (s->subdev_flags & SDF_CMD_READ)) |
bd5b4173 | 270 | return s; |
da56fdc6 IA |
271 | } |
272 | return dev->read_subdev; | |
43bd33f2 HS |
273 | } |
274 | ||
275 | static struct comedi_subdevice * | |
da56fdc6 | 276 | comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 277 | { |
bd5b4173 | 278 | struct comedi_subdevice *s; |
da56fdc6 | 279 | |
77c21b62 | 280 | lockdep_assert_held(&dev->mutex); |
da56fdc6 | 281 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
63ab0395 | 282 | s = comedi_subdevice_from_minor(dev, minor); |
88cc30cf | 283 | if (!s || (s->subdev_flags & SDF_CMD_WRITE)) |
bd5b4173 | 284 | return s; |
da56fdc6 IA |
285 | } |
286 | return dev->write_subdev; | |
43bd33f2 HS |
287 | } |
288 | ||
20f083c0 IA |
289 | static void comedi_file_reset(struct file *file) |
290 | { | |
291 | struct comedi_file *cfp = file->private_data; | |
292 | struct comedi_device *dev = cfp->dev; | |
293 | struct comedi_subdevice *s, *read_s, *write_s; | |
294 | unsigned int minor = iminor(file_inode(file)); | |
295 | ||
296 | read_s = dev->read_subdev; | |
297 | write_s = dev->write_subdev; | |
298 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
299 | s = comedi_subdevice_from_minor(dev, minor); | |
88cc30cf | 300 | if (!s || s->subdev_flags & SDF_CMD_READ) |
20f083c0 | 301 | read_s = s; |
88cc30cf | 302 | if (!s || s->subdev_flags & SDF_CMD_WRITE) |
20f083c0 IA |
303 | write_s = s; |
304 | } | |
305 | cfp->last_attached = dev->attached; | |
306 | cfp->last_detach_count = dev->detach_count; | |
34d34732 SS |
307 | WRITE_ONCE(cfp->read_subdev, read_s); |
308 | WRITE_ONCE(cfp->write_subdev, write_s); | |
20f083c0 IA |
309 | } |
310 | ||
311 | static void comedi_file_check(struct file *file) | |
312 | { | |
313 | struct comedi_file *cfp = file->private_data; | |
314 | struct comedi_device *dev = cfp->dev; | |
315 | ||
316 | if (cfp->last_attached != dev->attached || | |
317 | cfp->last_detach_count != dev->detach_count) | |
318 | comedi_file_reset(file); | |
319 | } | |
320 | ||
321 | static struct comedi_subdevice *comedi_file_read_subdevice(struct file *file) | |
322 | { | |
323 | struct comedi_file *cfp = file->private_data; | |
324 | ||
325 | comedi_file_check(file); | |
34d34732 | 326 | return READ_ONCE(cfp->read_subdev); |
20f083c0 IA |
327 | } |
328 | ||
329 | static struct comedi_subdevice *comedi_file_write_subdevice(struct file *file) | |
330 | { | |
331 | struct comedi_file *cfp = file->private_data; | |
332 | ||
333 | comedi_file_check(file); | |
34d34732 | 334 | return READ_ONCE(cfp->write_subdev); |
20f083c0 IA |
335 | } |
336 | ||
883db3d9 | 337 | static int resize_async_buffer(struct comedi_device *dev, |
b2073dcb IA |
338 | struct comedi_subdevice *s, |
339 | unsigned int new_size) | |
a5011a26 | 340 | { |
482f0a21 | 341 | struct comedi_async *async = s->async; |
a5011a26 HS |
342 | int retval; |
343 | ||
77c21b62 IA |
344 | lockdep_assert_held(&dev->mutex); |
345 | ||
a5011a26 HS |
346 | if (new_size > async->max_bufsize) |
347 | return -EPERM; | |
348 | ||
349 | if (s->busy) { | |
272850f0 HS |
350 | dev_dbg(dev->class_dev, |
351 | "subdevice is busy, cannot resize buffer\n"); | |
a5011a26 HS |
352 | return -EBUSY; |
353 | } | |
d4526ab4 | 354 | if (comedi_buf_is_mmapped(s)) { |
272850f0 HS |
355 | dev_dbg(dev->class_dev, |
356 | "subdevice is mmapped, cannot resize buffer\n"); | |
a5011a26 HS |
357 | return -EBUSY; |
358 | } | |
359 | ||
a2aab8b4 | 360 | /* make sure buffer is an integral number of pages (we round up) */ |
a5011a26 HS |
361 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
362 | ||
363 | retval = comedi_buf_alloc(dev, s, new_size); | |
364 | if (retval < 0) | |
365 | return retval; | |
366 | ||
367 | if (s->buf_change) { | |
d546b896 | 368 | retval = s->buf_change(dev, s); |
a5011a26 HS |
369 | if (retval < 0) |
370 | return retval; | |
371 | } | |
372 | ||
272850f0 HS |
373 | dev_dbg(dev->class_dev, "subd %d buffer resized to %i bytes\n", |
374 | s->index, async->prealloc_bufsz); | |
a5011a26 HS |
375 | return 0; |
376 | } | |
377 | ||
378 | /* sysfs attribute files */ | |
379 | ||
e56341ad | 380 | static ssize_t max_read_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
381 | struct device_attribute *attr, char *buf) |
382 | { | |
c88db469 | 383 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
384 | struct comedi_device *dev; |
385 | struct comedi_subdevice *s; | |
72fd9fac | 386 | unsigned int size = 0; |
a5011a26 | 387 | |
be535c9a | 388 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 389 | if (!dev) |
c88db469 IA |
390 | return -ENODEV; |
391 | ||
7f4656c5 | 392 | mutex_lock(&dev->mutex); |
da56fdc6 | 393 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
394 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
395 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 396 | mutex_unlock(&dev->mutex); |
a5011a26 | 397 | |
be535c9a | 398 | comedi_dev_put(dev); |
ecd56ff9 | 399 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
400 | } |
401 | ||
e56341ad | 402 | static ssize_t max_read_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
403 | struct device_attribute *attr, |
404 | const char *buf, size_t count) | |
405 | { | |
c88db469 | 406 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
407 | struct comedi_device *dev; |
408 | struct comedi_subdevice *s; | |
72fd9fac HS |
409 | unsigned int size; |
410 | int err; | |
411 | ||
412 | err = kstrtouint(buf, 10, &size); | |
413 | if (err) | |
414 | return err; | |
415 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 416 | return -EINVAL; |
72fd9fac | 417 | size *= 1024; |
a5011a26 | 418 | |
be535c9a | 419 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 420 | if (!dev) |
c88db469 IA |
421 | return -ENODEV; |
422 | ||
7f4656c5 | 423 | mutex_lock(&dev->mutex); |
da56fdc6 | 424 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
425 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
426 | s->async->max_bufsize = size; | |
427 | else | |
428 | err = -EINVAL; | |
7f4656c5 | 429 | mutex_unlock(&dev->mutex); |
a5011a26 | 430 | |
be535c9a | 431 | comedi_dev_put(dev); |
72fd9fac | 432 | return err ? err : count; |
a5011a26 | 433 | } |
e56341ad | 434 | static DEVICE_ATTR_RW(max_read_buffer_kb); |
a5011a26 | 435 | |
e56341ad | 436 | static ssize_t read_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
437 | struct device_attribute *attr, char *buf) |
438 | { | |
c88db469 | 439 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
440 | struct comedi_device *dev; |
441 | struct comedi_subdevice *s; | |
72fd9fac | 442 | unsigned int size = 0; |
a5011a26 | 443 | |
be535c9a | 444 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 445 | if (!dev) |
c88db469 IA |
446 | return -ENODEV; |
447 | ||
7f4656c5 | 448 | mutex_lock(&dev->mutex); |
da56fdc6 | 449 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
450 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
451 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 452 | mutex_unlock(&dev->mutex); |
a5011a26 | 453 | |
be535c9a | 454 | comedi_dev_put(dev); |
ecd56ff9 | 455 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
456 | } |
457 | ||
e56341ad | 458 | static ssize_t read_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
459 | struct device_attribute *attr, |
460 | const char *buf, size_t count) | |
461 | { | |
c88db469 | 462 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
463 | struct comedi_device *dev; |
464 | struct comedi_subdevice *s; | |
72fd9fac HS |
465 | unsigned int size; |
466 | int err; | |
467 | ||
468 | err = kstrtouint(buf, 10, &size); | |
469 | if (err) | |
470 | return err; | |
471 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 472 | return -EINVAL; |
72fd9fac | 473 | size *= 1024; |
a5011a26 | 474 | |
be535c9a | 475 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 476 | if (!dev) |
c88db469 IA |
477 | return -ENODEV; |
478 | ||
7f4656c5 | 479 | mutex_lock(&dev->mutex); |
da56fdc6 | 480 | s = comedi_read_subdevice(dev, minor); |
72fd9fac | 481 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
482f0a21 | 482 | err = resize_async_buffer(dev, s, size); |
72fd9fac HS |
483 | else |
484 | err = -EINVAL; | |
7f4656c5 | 485 | mutex_unlock(&dev->mutex); |
a5011a26 | 486 | |
be535c9a | 487 | comedi_dev_put(dev); |
72fd9fac | 488 | return err ? err : count; |
a5011a26 | 489 | } |
e56341ad | 490 | static DEVICE_ATTR_RW(read_buffer_kb); |
883db3d9 | 491 | |
e56341ad | 492 | static ssize_t max_write_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
493 | struct device_attribute *attr, |
494 | char *buf) | |
495 | { | |
c88db469 | 496 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
497 | struct comedi_device *dev; |
498 | struct comedi_subdevice *s; | |
72fd9fac | 499 | unsigned int size = 0; |
a5011a26 | 500 | |
be535c9a | 501 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 502 | if (!dev) |
c88db469 IA |
503 | return -ENODEV; |
504 | ||
7f4656c5 | 505 | mutex_lock(&dev->mutex); |
da56fdc6 | 506 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
507 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
508 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 509 | mutex_unlock(&dev->mutex); |
a5011a26 | 510 | |
be535c9a | 511 | comedi_dev_put(dev); |
ecd56ff9 | 512 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
513 | } |
514 | ||
e56341ad | 515 | static ssize_t max_write_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
516 | struct device_attribute *attr, |
517 | const char *buf, size_t count) | |
518 | { | |
c88db469 | 519 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
520 | struct comedi_device *dev; |
521 | struct comedi_subdevice *s; | |
72fd9fac HS |
522 | unsigned int size; |
523 | int err; | |
524 | ||
525 | err = kstrtouint(buf, 10, &size); | |
526 | if (err) | |
527 | return err; | |
528 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 529 | return -EINVAL; |
72fd9fac | 530 | size *= 1024; |
a5011a26 | 531 | |
be535c9a | 532 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 533 | if (!dev) |
c88db469 IA |
534 | return -ENODEV; |
535 | ||
7f4656c5 | 536 | mutex_lock(&dev->mutex); |
da56fdc6 | 537 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
538 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
539 | s->async->max_bufsize = size; | |
540 | else | |
541 | err = -EINVAL; | |
7f4656c5 | 542 | mutex_unlock(&dev->mutex); |
a5011a26 | 543 | |
be535c9a | 544 | comedi_dev_put(dev); |
72fd9fac | 545 | return err ? err : count; |
a5011a26 | 546 | } |
e56341ad | 547 | static DEVICE_ATTR_RW(max_write_buffer_kb); |
a5011a26 | 548 | |
e56341ad | 549 | static ssize_t write_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
550 | struct device_attribute *attr, char *buf) |
551 | { | |
c88db469 | 552 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
553 | struct comedi_device *dev; |
554 | struct comedi_subdevice *s; | |
72fd9fac | 555 | unsigned int size = 0; |
a5011a26 | 556 | |
be535c9a | 557 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 558 | if (!dev) |
c88db469 IA |
559 | return -ENODEV; |
560 | ||
7f4656c5 | 561 | mutex_lock(&dev->mutex); |
da56fdc6 | 562 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
563 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
564 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 565 | mutex_unlock(&dev->mutex); |
a5011a26 | 566 | |
be535c9a | 567 | comedi_dev_put(dev); |
ecd56ff9 | 568 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
569 | } |
570 | ||
e56341ad | 571 | static ssize_t write_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
572 | struct device_attribute *attr, |
573 | const char *buf, size_t count) | |
574 | { | |
c88db469 | 575 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
576 | struct comedi_device *dev; |
577 | struct comedi_subdevice *s; | |
72fd9fac HS |
578 | unsigned int size; |
579 | int err; | |
580 | ||
581 | err = kstrtouint(buf, 10, &size); | |
582 | if (err) | |
583 | return err; | |
584 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 585 | return -EINVAL; |
72fd9fac | 586 | size *= 1024; |
a5011a26 | 587 | |
be535c9a | 588 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 589 | if (!dev) |
c88db469 IA |
590 | return -ENODEV; |
591 | ||
7f4656c5 | 592 | mutex_lock(&dev->mutex); |
da56fdc6 | 593 | s = comedi_write_subdevice(dev, minor); |
72fd9fac | 594 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
482f0a21 | 595 | err = resize_async_buffer(dev, s, size); |
72fd9fac HS |
596 | else |
597 | err = -EINVAL; | |
7f4656c5 | 598 | mutex_unlock(&dev->mutex); |
a5011a26 | 599 | |
be535c9a | 600 | comedi_dev_put(dev); |
72fd9fac | 601 | return err ? err : count; |
a5011a26 | 602 | } |
e56341ad GKH |
603 | static DEVICE_ATTR_RW(write_buffer_kb); |
604 | ||
605 | static struct attribute *comedi_dev_attrs[] = { | |
606 | &dev_attr_max_read_buffer_kb.attr, | |
607 | &dev_attr_read_buffer_kb.attr, | |
608 | &dev_attr_max_write_buffer_kb.attr, | |
609 | &dev_attr_write_buffer_kb.attr, | |
610 | NULL, | |
a5011a26 | 611 | }; |
e56341ad | 612 | ATTRIBUTE_GROUPS(comedi_dev); |
ed9eccbe | 613 | |
ef4b4b27 | 614 | static void __comedi_clear_subdevice_runflags(struct comedi_subdevice *s, |
d4d47895 | 615 | unsigned int bits) |
ef4b4b27 IA |
616 | { |
617 | s->runflags &= ~bits; | |
618 | } | |
619 | ||
620 | static void __comedi_set_subdevice_runflags(struct comedi_subdevice *s, | |
d4d47895 | 621 | unsigned int bits) |
ef4b4b27 IA |
622 | { |
623 | s->runflags |= bits; | |
624 | } | |
625 | ||
cc64ea42 | 626 | static void comedi_update_subdevice_runflags(struct comedi_subdevice *s, |
b2073dcb IA |
627 | unsigned int mask, |
628 | unsigned int bits) | |
2aae0076 HS |
629 | { |
630 | unsigned long flags; | |
631 | ||
632 | spin_lock_irqsave(&s->spin_lock, flags); | |
ef4b4b27 IA |
633 | __comedi_clear_subdevice_runflags(s, mask); |
634 | __comedi_set_subdevice_runflags(s, bits & mask); | |
2aae0076 HS |
635 | spin_unlock_irqrestore(&s->spin_lock, flags); |
636 | } | |
637 | ||
d4d47895 | 638 | static unsigned int __comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
ef4b4b27 IA |
639 | { |
640 | return s->runflags; | |
641 | } | |
642 | ||
d4d47895 | 643 | static unsigned int comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
74120719 HS |
644 | { |
645 | unsigned long flags; | |
d4d47895 | 646 | unsigned int runflags; |
74120719 HS |
647 | |
648 | spin_lock_irqsave(&s->spin_lock, flags); | |
ef4b4b27 | 649 | runflags = __comedi_get_subdevice_runflags(s); |
74120719 HS |
650 | spin_unlock_irqrestore(&s->spin_lock, flags); |
651 | return runflags; | |
652 | } | |
74120719 | 653 | |
d4d47895 | 654 | static bool comedi_is_runflags_running(unsigned int runflags) |
b183a836 IA |
655 | { |
656 | return runflags & COMEDI_SRF_RUNNING; | |
657 | } | |
658 | ||
d4d47895 | 659 | static bool comedi_is_runflags_in_error(unsigned int runflags) |
b183a836 IA |
660 | { |
661 | return runflags & COMEDI_SRF_ERROR; | |
662 | } | |
663 | ||
dd630cde | 664 | /** |
a3e39942 IA |
665 | * comedi_is_subdevice_running() - Check if async command running on subdevice |
666 | * @s: COMEDI subdevice. | |
dd630cde | 667 | * |
a3e39942 IA |
668 | * Return: %true if an asynchronous COMEDI command is active on the |
669 | * subdevice, else %false. | |
dd630cde | 670 | */ |
e0dac318 HS |
671 | bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
672 | { | |
d4d47895 | 673 | unsigned int runflags = comedi_get_subdevice_runflags(s); |
e0dac318 | 674 | |
b183a836 | 675 | return comedi_is_runflags_running(runflags); |
e0dac318 HS |
676 | } |
677 | EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); | |
678 | ||
ef4b4b27 IA |
679 | static bool __comedi_is_subdevice_running(struct comedi_subdevice *s) |
680 | { | |
d4d47895 | 681 | unsigned int runflags = __comedi_get_subdevice_runflags(s); |
ef4b4b27 IA |
682 | |
683 | return comedi_is_runflags_running(runflags); | |
684 | } | |
685 | ||
8fc369ae IA |
686 | bool comedi_can_auto_free_spriv(struct comedi_subdevice *s) |
687 | { | |
d4d47895 | 688 | unsigned int runflags = __comedi_get_subdevice_runflags(s); |
8fc369ae IA |
689 | |
690 | return runflags & COMEDI_SRF_FREE_SPRIV; | |
691 | } | |
692 | ||
693 | /** | |
a3e39942 IA |
694 | * comedi_set_spriv_auto_free() - Mark subdevice private data as freeable |
695 | * @s: COMEDI subdevice. | |
8fc369ae IA |
696 | * |
697 | * Mark the subdevice as having a pointer to private data that can be | |
a3e39942 IA |
698 | * automatically freed when the COMEDI device is detached from the low-level |
699 | * driver. | |
8fc369ae IA |
700 | */ |
701 | void comedi_set_spriv_auto_free(struct comedi_subdevice *s) | |
702 | { | |
703 | __comedi_set_subdevice_runflags(s, COMEDI_SRF_FREE_SPRIV); | |
704 | } | |
705 | EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free); | |
706 | ||
588ba6dc | 707 | /** |
a3e39942 IA |
708 | * comedi_alloc_spriv - Allocate memory for the subdevice private data |
709 | * @s: COMEDI subdevice. | |
710 | * @size: Size of the memory to allocate. | |
588ba6dc | 711 | * |
a3e39942 IA |
712 | * Allocate memory for the subdevice private data and point @s->private |
713 | * to it. The memory will be freed automatically when the COMEDI device | |
714 | * is detached from the low-level driver. | |
715 | * | |
716 | * Return: A pointer to the allocated memory @s->private on success. | |
717 | * Return NULL on failure. | |
588ba6dc | 718 | */ |
0480bcb9 | 719 | void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size) |
588ba6dc | 720 | { |
0480bcb9 HS |
721 | s->private = kzalloc(size, GFP_KERNEL); |
722 | if (s->private) | |
8fc369ae | 723 | comedi_set_spriv_auto_free(s); |
0480bcb9 | 724 | return s->private; |
588ba6dc | 725 | } |
0480bcb9 | 726 | EXPORT_SYMBOL_GPL(comedi_alloc_spriv); |
588ba6dc | 727 | |
2aae0076 | 728 | /* |
a2aab8b4 | 729 | * This function restores a subdevice to an idle state. |
2aae0076 HS |
730 | */ |
731 | static void do_become_nonbusy(struct comedi_device *dev, | |
732 | struct comedi_subdevice *s) | |
733 | { | |
734 | struct comedi_async *async = s->async; | |
735 | ||
77c21b62 | 736 | lockdep_assert_held(&dev->mutex); |
cc64ea42 | 737 | comedi_update_subdevice_runflags(s, COMEDI_SRF_RUNNING, 0); |
2aae0076 | 738 | if (async) { |
fcc18a9a | 739 | comedi_buf_reset(s); |
2aae0076 HS |
740 | async->inttrig = NULL; |
741 | kfree(async->cmd.chanlist); | |
742 | async->cmd.chanlist = NULL; | |
8da8c86f | 743 | s->busy = NULL; |
258c1dd7 | 744 | wake_up_interruptible_all(&async->wait_head); |
2aae0076 HS |
745 | } else { |
746 | dev_err(dev->class_dev, | |
e4f857f7 | 747 | "BUG: (?) %s called with async=NULL\n", __func__); |
8da8c86f | 748 | s->busy = NULL; |
2aae0076 | 749 | } |
2aae0076 HS |
750 | } |
751 | ||
752 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
753 | { | |
754 | int ret = 0; | |
755 | ||
77c21b62 | 756 | lockdep_assert_held(&dev->mutex); |
f0124630 | 757 | if (comedi_is_subdevice_running(s) && s->cancel) |
2aae0076 HS |
758 | ret = s->cancel(dev, s); |
759 | ||
760 | do_become_nonbusy(dev, s); | |
761 | ||
762 | return ret; | |
763 | } | |
764 | ||
d19db51a IA |
765 | void comedi_device_cancel_all(struct comedi_device *dev) |
766 | { | |
767 | struct comedi_subdevice *s; | |
768 | int i; | |
769 | ||
77c21b62 | 770 | lockdep_assert_held(&dev->mutex); |
d19db51a IA |
771 | if (!dev->attached) |
772 | return; | |
773 | ||
774 | for (i = 0; i < dev->n_subdevices; i++) { | |
775 | s = &dev->subdevices[i]; | |
776 | if (s->async) | |
777 | do_cancel(dev, s); | |
778 | } | |
779 | } | |
780 | ||
2aae0076 HS |
781 | static int is_device_busy(struct comedi_device *dev) |
782 | { | |
783 | struct comedi_subdevice *s; | |
784 | int i; | |
785 | ||
77c21b62 | 786 | lockdep_assert_held(&dev->mutex); |
2aae0076 HS |
787 | if (!dev->attached) |
788 | return 0; | |
789 | ||
790 | for (i = 0; i < dev->n_subdevices; i++) { | |
791 | s = &dev->subdevices[i]; | |
792 | if (s->busy) | |
793 | return 1; | |
d4526ab4 | 794 | if (s->async && comedi_buf_is_mmapped(s)) |
2aae0076 HS |
795 | return 1; |
796 | } | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
ed9eccbe | 801 | /* |
18e01b24 IA |
802 | * COMEDI_DEVCONFIG ioctl |
803 | * attaches (and configures) or detaches a legacy device | |
804 | * | |
805 | * arg: | |
806 | * pointer to comedi_devconfig structure (NULL if detaching) | |
807 | * | |
808 | * reads: | |
809 | * comedi_devconfig structure (if attaching) | |
810 | * | |
811 | * writes: | |
812 | * nothing | |
813 | */ | |
0a85b6f0 | 814 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 815 | struct comedi_devconfig __user *arg) |
ed9eccbe | 816 | { |
0707bb04 | 817 | struct comedi_devconfig it; |
ed9eccbe | 818 | |
77c21b62 | 819 | lockdep_assert_held(&dev->mutex); |
ed9eccbe DS |
820 | if (!capable(CAP_SYS_ADMIN)) |
821 | return -EPERM; | |
822 | ||
88cc30cf | 823 | if (!arg) { |
ed9eccbe DS |
824 | if (is_device_busy(dev)) |
825 | return -EBUSY; | |
476b8477 | 826 | if (dev->attached) { |
ed9eccbe | 827 | struct module *driver_module = dev->driver->module; |
4bac39f6 | 828 | |
ed9eccbe DS |
829 | comedi_device_detach(dev); |
830 | module_put(driver_module); | |
831 | } | |
832 | return 0; | |
833 | } | |
834 | ||
bc252fd1 | 835 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
836 | return -EFAULT; |
837 | ||
838 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
839 | ||
d1843132 HS |
840 | if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
841 | dev_warn(dev->class_dev, | |
842 | "comedi_config --init_data is deprecated\n"); | |
843 | return -EINVAL; | |
ed9eccbe DS |
844 | } |
845 | ||
8ab4ed6e IA |
846 | if (dev->minor >= comedi_num_legacy_minors) |
847 | /* don't re-use dynamically allocated comedi devices */ | |
848 | return -EBUSY; | |
849 | ||
b2a644b4 IA |
850 | /* This increments the driver module count on success. */ |
851 | return comedi_device_attach(dev, &it); | |
ed9eccbe DS |
852 | } |
853 | ||
854 | /* | |
18e01b24 IA |
855 | * COMEDI_BUFCONFIG ioctl |
856 | * buffer configuration | |
857 | * | |
858 | * arg: | |
859 | * pointer to comedi_bufconfig structure | |
860 | * | |
861 | * reads: | |
862 | * comedi_bufconfig structure | |
863 | * | |
864 | * writes: | |
865 | * modified comedi_bufconfig structure | |
866 | */ | |
92d0127c GKH |
867 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
868 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 869 | { |
be6aba4a | 870 | struct comedi_bufconfig bc; |
d163679c | 871 | struct comedi_async *async; |
34c43922 | 872 | struct comedi_subdevice *s; |
883db3d9 | 873 | int retval = 0; |
ed9eccbe | 874 | |
77c21b62 | 875 | lockdep_assert_held(&dev->mutex); |
bc252fd1 | 876 | if (copy_from_user(&bc, arg, sizeof(bc))) |
ed9eccbe DS |
877 | return -EFAULT; |
878 | ||
11f80ddf | 879 | if (bc.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
880 | return -EINVAL; |
881 | ||
b077f2cd | 882 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
883 | async = s->async; |
884 | ||
885 | if (!async) { | |
272850f0 HS |
886 | dev_dbg(dev->class_dev, |
887 | "subdevice does not have async capability\n"); | |
ed9eccbe DS |
888 | bc.size = 0; |
889 | bc.maximum_size = 0; | |
890 | goto copyback; | |
891 | } | |
892 | ||
893 | if (bc.maximum_size) { | |
894 | if (!capable(CAP_SYS_ADMIN)) | |
895 | return -EPERM; | |
896 | ||
897 | async->max_bufsize = bc.maximum_size; | |
898 | } | |
899 | ||
900 | if (bc.size) { | |
482f0a21 | 901 | retval = resize_async_buffer(dev, s, bc.size); |
883db3d9 FMH |
902 | if (retval < 0) |
903 | return retval; | |
ed9eccbe DS |
904 | } |
905 | ||
906 | bc.size = async->prealloc_bufsz; | |
907 | bc.maximum_size = async->max_bufsize; | |
908 | ||
476b8477 | 909 | copyback: |
bc252fd1 | 910 | if (copy_to_user(arg, &bc, sizeof(bc))) |
ed9eccbe DS |
911 | return -EFAULT; |
912 | ||
913 | return 0; | |
914 | } | |
915 | ||
916 | /* | |
18e01b24 IA |
917 | * COMEDI_DEVINFO ioctl |
918 | * device info | |
919 | * | |
920 | * arg: | |
921 | * pointer to comedi_devinfo structure | |
922 | * | |
923 | * reads: | |
924 | * nothing | |
925 | * | |
926 | * writes: | |
927 | * comedi_devinfo structure | |
928 | */ | |
0a85b6f0 | 929 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
930 | struct comedi_devinfo __user *arg, |
931 | struct file *file) | |
ed9eccbe | 932 | { |
0e700923 HS |
933 | struct comedi_subdevice *s; |
934 | struct comedi_devinfo devinfo; | |
ed9eccbe | 935 | |
77c21b62 | 936 | lockdep_assert_held(&dev->mutex); |
ed9eccbe DS |
937 | memset(&devinfo, 0, sizeof(devinfo)); |
938 | ||
939 | /* fill devinfo structure */ | |
940 | devinfo.version_code = COMEDI_VERSION_CODE; | |
941 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
942 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
943 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 944 | |
20f083c0 | 945 | s = comedi_file_read_subdevice(file); |
0e700923 | 946 | if (s) |
90a35c15 | 947 | devinfo.read_subdevice = s->index; |
476b8477 | 948 | else |
ed9eccbe | 949 | devinfo.read_subdevice = -1; |
476b8477 | 950 | |
20f083c0 | 951 | s = comedi_file_write_subdevice(file); |
0e700923 | 952 | if (s) |
90a35c15 | 953 | devinfo.write_subdevice = s->index; |
476b8477 | 954 | else |
ed9eccbe | 955 | devinfo.write_subdevice = -1; |
ed9eccbe | 956 | |
bc252fd1 | 957 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
ed9eccbe DS |
958 | return -EFAULT; |
959 | ||
960 | return 0; | |
961 | } | |
962 | ||
963 | /* | |
18e01b24 IA |
964 | * COMEDI_SUBDINFO ioctl |
965 | * subdevices info | |
966 | * | |
967 | * arg: | |
968 | * pointer to array of comedi_subdinfo structures | |
969 | * | |
970 | * reads: | |
971 | * nothing | |
972 | * | |
973 | * writes: | |
974 | * array of comedi_subdinfo structures | |
975 | */ | |
0a85b6f0 | 976 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 977 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
978 | { |
979 | int ret, i; | |
bd52efbb | 980 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 981 | struct comedi_subdevice *s; |
ed9eccbe | 982 | |
77c21b62 | 983 | lockdep_assert_held(&dev->mutex); |
bc252fd1 | 984 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
ed9eccbe DS |
985 | if (!tmp) |
986 | return -ENOMEM; | |
987 | ||
988 | /* fill subdinfo structs */ | |
989 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 990 | s = &dev->subdevices[i]; |
ed9eccbe DS |
991 | us = tmp + i; |
992 | ||
993 | us->type = s->type; | |
994 | us->n_chan = s->n_chan; | |
995 | us->subd_flags = s->subdev_flags; | |
f0124630 | 996 | if (comedi_is_subdevice_running(s)) |
ed9eccbe DS |
997 | us->subd_flags |= SDF_RUNNING; |
998 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
999 | us->timer_type = TIMER_nanosec; | |
1000 | us->len_chanlist = s->len_chanlist; | |
1001 | us->maxdata = s->maxdata; | |
1002 | if (s->range_table) { | |
1003 | us->range_type = | |
476b8477 | 1004 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
1005 | } else { |
1006 | us->range_type = 0; /* XXX */ | |
1007 | } | |
ed9eccbe DS |
1008 | |
1009 | if (s->busy) | |
1010 | us->subd_flags |= SDF_BUSY; | |
1011 | if (s->busy == file) | |
1012 | us->subd_flags |= SDF_BUSY_OWNER; | |
1013 | if (s->lock) | |
1014 | us->subd_flags |= SDF_LOCKED; | |
1015 | if (s->lock == file) | |
1016 | us->subd_flags |= SDF_LOCK_OWNER; | |
1017 | if (!s->maxdata && s->maxdata_list) | |
1018 | us->subd_flags |= SDF_MAXDATA; | |
ed9eccbe DS |
1019 | if (s->range_table_list) |
1020 | us->subd_flags |= SDF_RANGETYPE; | |
1021 | if (s->do_cmd) | |
1022 | us->subd_flags |= SDF_CMD; | |
1023 | ||
1024 | if (s->insn_bits != &insn_inval) | |
1025 | us->insn_bits_support = COMEDI_SUPPORTED; | |
1026 | else | |
1027 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
ed9eccbe DS |
1028 | } |
1029 | ||
bc252fd1 | 1030 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
ed9eccbe DS |
1031 | |
1032 | kfree(tmp); | |
1033 | ||
1034 | return ret ? -EFAULT : 0; | |
1035 | } | |
1036 | ||
1037 | /* | |
18e01b24 IA |
1038 | * COMEDI_CHANINFO ioctl |
1039 | * subdevice channel info | |
1040 | * | |
1041 | * arg: | |
1042 | * pointer to comedi_chaninfo structure | |
1043 | * | |
1044 | * reads: | |
1045 | * comedi_chaninfo structure | |
1046 | * | |
1047 | * writes: | |
1048 | * array of maxdata values to chaninfo->maxdata_list if requested | |
1049 | * array of range table lengths to chaninfo->range_table_list if requested | |
1050 | */ | |
0a85b6f0 | 1051 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
3fbfd222 | 1052 | struct comedi_chaninfo *it) |
ed9eccbe | 1053 | { |
34c43922 | 1054 | struct comedi_subdevice *s; |
ed9eccbe | 1055 | |
77c21b62 | 1056 | lockdep_assert_held(&dev->mutex); |
ed9eccbe | 1057 | |
3fbfd222 | 1058 | if (it->subdev >= dev->n_subdevices) |
ed9eccbe | 1059 | return -EINVAL; |
3fbfd222 | 1060 | s = &dev->subdevices[it->subdev]; |
ed9eccbe | 1061 | |
3fbfd222 | 1062 | if (it->maxdata_list) { |
ed9eccbe DS |
1063 | if (s->maxdata || !s->maxdata_list) |
1064 | return -EINVAL; | |
3fbfd222 | 1065 | if (copy_to_user(it->maxdata_list, s->maxdata_list, |
790c5541 | 1066 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
1067 | return -EFAULT; |
1068 | } | |
1069 | ||
3fbfd222 | 1070 | if (it->flaglist) |
64d9b1d2 | 1071 | return -EINVAL; /* flaglist not supported */ |
ed9eccbe | 1072 | |
3fbfd222 | 1073 | if (it->rangelist) { |
ed9eccbe DS |
1074 | int i; |
1075 | ||
1076 | if (!s->range_table_list) | |
1077 | return -EINVAL; | |
1078 | for (i = 0; i < s->n_chan; i++) { | |
1079 | int x; | |
1080 | ||
3fbfd222 | 1081 | x = (dev->minor << 28) | (it->subdev << 24) | (i << 16) | |
476b8477 | 1082 | (s->range_table_list[i]->length); |
3fbfd222 | 1083 | if (put_user(x, it->rangelist + i)) |
81604d43 | 1084 | return -EFAULT; |
ed9eccbe | 1085 | } |
ed9eccbe DS |
1086 | } |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
18e01b24 IA |
1091 | /* |
1092 | * COMEDI_BUFINFO ioctl | |
1093 | * buffer information | |
1094 | * | |
1095 | * arg: | |
1096 | * pointer to comedi_bufinfo structure | |
1097 | * | |
1098 | * reads: | |
1099 | * comedi_bufinfo structure | |
1100 | * | |
1101 | * writes: | |
1102 | * modified comedi_bufinfo structure | |
1103 | */ | |
92d0127c | 1104 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 1105 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 1106 | { |
9aa5339a | 1107 | struct comedi_bufinfo bi; |
34c43922 | 1108 | struct comedi_subdevice *s; |
d163679c | 1109 | struct comedi_async *async; |
36a51170 IA |
1110 | unsigned int runflags; |
1111 | int retval = 0; | |
06578561 | 1112 | bool become_nonbusy = false; |
ed9eccbe | 1113 | |
77c21b62 | 1114 | lockdep_assert_held(&dev->mutex); |
bc252fd1 | 1115 | if (copy_from_user(&bi, arg, sizeof(bi))) |
ed9eccbe DS |
1116 | return -EFAULT; |
1117 | ||
7b1a5e2f | 1118 | if (bi.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
1119 | return -EINVAL; |
1120 | ||
b077f2cd | 1121 | s = &dev->subdevices[bi.subdevice]; |
53fa827e | 1122 | |
ed9eccbe DS |
1123 | async = s->async; |
1124 | ||
57c563bf IA |
1125 | if (!async || s->busy != file) |
1126 | return -EINVAL; | |
ed9eccbe | 1127 | |
be611a1d | 1128 | runflags = comedi_get_subdevice_runflags(s); |
66c36502 IA |
1129 | if (!(async->cmd.flags & CMDF_WRITE)) { |
1130 | /* command was set up in "read" direction */ | |
1131 | if (bi.bytes_read) { | |
1132 | comedi_buf_read_alloc(s, bi.bytes_read); | |
1133 | bi.bytes_read = comedi_buf_read_free(s, bi.bytes_read); | |
ed9eccbe | 1134 | } |
36a51170 IA |
1135 | /* |
1136 | * If nothing left to read, and command has stopped, and | |
1137 | * {"read" position not updated or command stopped normally}, | |
1138 | * then become non-busy. | |
1139 | */ | |
36a51170 IA |
1140 | if (comedi_buf_read_n_available(s) == 0 && |
1141 | !comedi_is_runflags_running(runflags) && | |
1142 | (bi.bytes_read == 0 || | |
1143 | !comedi_is_runflags_in_error(runflags))) { | |
f3aa8c0b | 1144 | become_nonbusy = true; |
36a51170 IA |
1145 | if (comedi_is_runflags_in_error(runflags)) |
1146 | retval = -EPIPE; | |
1147 | } | |
66c36502 IA |
1148 | bi.bytes_written = 0; |
1149 | } else { | |
1150 | /* command was set up in "write" direction */ | |
be611a1d | 1151 | if (!comedi_is_runflags_running(runflags)) { |
bb0c6bfa | 1152 | bi.bytes_written = 0; |
be611a1d IA |
1153 | become_nonbusy = true; |
1154 | if (comedi_is_runflags_in_error(runflags)) | |
1155 | retval = -EPIPE; | |
1156 | } else if (bi.bytes_written) { | |
66c36502 IA |
1157 | comedi_buf_write_alloc(s, bi.bytes_written); |
1158 | bi.bytes_written = | |
1159 | comedi_buf_write_free(s, bi.bytes_written); | |
1160 | } | |
1161 | bi.bytes_read = 0; | |
ed9eccbe DS |
1162 | } |
1163 | ||
1164 | bi.buf_write_count = async->buf_write_count; | |
1165 | bi.buf_write_ptr = async->buf_write_ptr; | |
1166 | bi.buf_read_count = async->buf_read_count; | |
1167 | bi.buf_read_ptr = async->buf_read_ptr; | |
1168 | ||
06578561 IA |
1169 | if (become_nonbusy) |
1170 | do_become_nonbusy(dev, s); | |
1171 | ||
36a51170 IA |
1172 | if (retval) |
1173 | return retval; | |
1174 | ||
bc252fd1 | 1175 | if (copy_to_user(arg, &bi, sizeof(bi))) |
ed9eccbe DS |
1176 | return -EFAULT; |
1177 | ||
1178 | return 0; | |
1179 | } | |
1180 | ||
0a85b6f0 MT |
1181 | static int check_insn_config_length(struct comedi_insn *insn, |
1182 | unsigned int *data) | |
ed9eccbe | 1183 | { |
476b8477 GKH |
1184 | if (insn->n < 1) |
1185 | return -EINVAL; | |
ed9eccbe DS |
1186 | |
1187 | switch (data[0]) { | |
1188 | case INSN_CONFIG_DIO_OUTPUT: | |
1189 | case INSN_CONFIG_DIO_INPUT: | |
1190 | case INSN_CONFIG_DISARM: | |
1191 | case INSN_CONFIG_RESET: | |
1192 | if (insn->n == 1) | |
1193 | return 0; | |
1194 | break; | |
1195 | case INSN_CONFIG_ARM: | |
1196 | case INSN_CONFIG_DIO_QUERY: | |
1197 | case INSN_CONFIG_BLOCK_SIZE: | |
1198 | case INSN_CONFIG_FILTER: | |
1199 | case INSN_CONFIG_SERIAL_CLOCK: | |
1200 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
1201 | case INSN_CONFIG_ALT_SOURCE: | |
1202 | case INSN_CONFIG_SET_COUNTER_MODE: | |
1203 | case INSN_CONFIG_8254_READ_STATUS: | |
1204 | case INSN_CONFIG_SET_ROUTING: | |
1205 | case INSN_CONFIG_GET_ROUTING: | |
1206 | case INSN_CONFIG_GET_PWM_STATUS: | |
1207 | case INSN_CONFIG_PWM_SET_PERIOD: | |
1208 | case INSN_CONFIG_PWM_GET_PERIOD: | |
1209 | if (insn->n == 2) | |
1210 | return 0; | |
1211 | break; | |
1212 | case INSN_CONFIG_SET_GATE_SRC: | |
1213 | case INSN_CONFIG_GET_GATE_SRC: | |
1214 | case INSN_CONFIG_SET_CLOCK_SRC: | |
1215 | case INSN_CONFIG_GET_CLOCK_SRC: | |
1216 | case INSN_CONFIG_SET_OTHER_SRC: | |
1217 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
1218 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
1219 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
1220 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
1221 | if (insn->n == 3) | |
1222 | return 0; | |
1223 | break; | |
1224 | case INSN_CONFIG_PWM_OUTPUT: | |
1225 | case INSN_CONFIG_ANALOG_TRIG: | |
e3b9ea9a | 1226 | case INSN_CONFIG_TIMER_1: |
ed9eccbe DS |
1227 | if (insn->n == 5) |
1228 | return 0; | |
1229 | break; | |
b0a2b6d8 IA |
1230 | case INSN_CONFIG_DIGITAL_TRIG: |
1231 | if (insn->n == 6) | |
1232 | return 0; | |
1233 | break; | |
832f3336 SO |
1234 | case INSN_CONFIG_GET_CMD_TIMING_CONSTRAINTS: |
1235 | if (insn->n >= 4) | |
1236 | return 0; | |
1237 | break; | |
a2aab8b4 IA |
1238 | /* |
1239 | * by default we allow the insn since we don't have checks for | |
1240 | * all possible cases yet | |
1241 | */ | |
ed9eccbe | 1242 | default: |
c2ad078b | 1243 | pr_warn("No check for data length of config insn id %i is implemented\n", |
4f870fe6 | 1244 | data[0]); |
c2ad078b HS |
1245 | pr_warn("Add a check to %s in %s\n", __func__, __FILE__); |
1246 | pr_warn("Assuming n=%i is correct\n", insn->n); | |
ed9eccbe | 1247 | return 0; |
ed9eccbe DS |
1248 | } |
1249 | return -EINVAL; | |
1250 | } | |
1251 | ||
d7569ad7 SO |
1252 | static int check_insn_device_config_length(struct comedi_insn *insn, |
1253 | unsigned int *data) | |
1254 | { | |
1255 | if (insn->n < 1) | |
1256 | return -EINVAL; | |
1257 | ||
1258 | switch (data[0]) { | |
1259 | case INSN_DEVICE_CONFIG_TEST_ROUTE: | |
1260 | case INSN_DEVICE_CONFIG_CONNECT_ROUTE: | |
1261 | case INSN_DEVICE_CONFIG_DISCONNECT_ROUTE: | |
1262 | if (insn->n == 3) | |
1263 | return 0; | |
1264 | break; | |
1265 | case INSN_DEVICE_CONFIG_GET_ROUTES: | |
1266 | /* | |
1267 | * Big enough for config_id and the length of the userland | |
1268 | * memory buffer. Additional length should be in factors of 2 | |
1269 | * to communicate any returned route pairs (source,destination). | |
1270 | */ | |
1271 | if (insn->n >= 2) | |
1272 | return 0; | |
1273 | break; | |
1274 | } | |
1275 | return -EINVAL; | |
1276 | } | |
1277 | ||
1278 | /** | |
1279 | * get_valid_routes() - Calls low-level driver get_valid_routes function to | |
1280 | * either return a count of valid routes to user, or copy | |
1281 | * of list of all valid device routes to buffer in | |
1282 | * userspace. | |
1283 | * @dev: comedi device pointer | |
1284 | * @data: data from user insn call. The length of the data must be >= 2. | |
1285 | * data[0] must contain the INSN_DEVICE_CONFIG config_id. | |
1286 | * data[1](input) contains the number of _pairs_ for which memory is | |
1287 | * allotted from the user. If the user specifies '0', then only | |
1288 | * the number of pairs available is returned. | |
1289 | * data[1](output) returns either the number of pairs available (if none | |
1290 | * where requested) or the number of _pairs_ that are copied back | |
1291 | * to the user. | |
1292 | * data[2::2] returns each (source, destination) pair. | |
1293 | * | |
1294 | * Return: -EINVAL if low-level driver does not allocate and return routes as | |
1295 | * expected. Returns 0 otherwise. | |
1296 | */ | |
1297 | static int get_valid_routes(struct comedi_device *dev, unsigned int *data) | |
1298 | { | |
77c21b62 | 1299 | lockdep_assert_held(&dev->mutex); |
d7569ad7 SO |
1300 | data[1] = dev->get_valid_routes(dev, data[1], data + 2); |
1301 | return 0; | |
1302 | } | |
1303 | ||
0a85b6f0 MT |
1304 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
1305 | unsigned int *data, void *file) | |
ed9eccbe | 1306 | { |
34c43922 | 1307 | struct comedi_subdevice *s; |
ed9eccbe DS |
1308 | int ret = 0; |
1309 | int i; | |
1310 | ||
77c21b62 | 1311 | lockdep_assert_held(&dev->mutex); |
ed9eccbe DS |
1312 | if (insn->insn & INSN_MASK_SPECIAL) { |
1313 | /* a non-subdevice instruction */ | |
1314 | ||
1315 | switch (insn->insn) { | |
1316 | case INSN_GTOD: | |
1317 | { | |
70db384c | 1318 | struct timespec64 tv; |
ed9eccbe DS |
1319 | |
1320 | if (insn->n != 2) { | |
1321 | ret = -EINVAL; | |
1322 | break; | |
1323 | } | |
1324 | ||
70db384c AB |
1325 | ktime_get_real_ts64(&tv); |
1326 | /* unsigned data safe until 2106 */ | |
1327 | data[0] = (unsigned int)tv.tv_sec; | |
1328 | data[1] = tv.tv_nsec / NSEC_PER_USEC; | |
ed9eccbe DS |
1329 | ret = 2; |
1330 | ||
1331 | break; | |
1332 | } | |
1333 | case INSN_WAIT: | |
1334 | if (insn->n != 1 || data[0] >= 100000) { | |
1335 | ret = -EINVAL; | |
1336 | break; | |
1337 | } | |
1338 | udelay(data[0] / 1000); | |
1339 | ret = 1; | |
1340 | break; | |
1341 | case INSN_INTTRIG: | |
1342 | if (insn->n != 1) { | |
1343 | ret = -EINVAL; | |
1344 | break; | |
1345 | } | |
1346 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1347 | dev_dbg(dev->class_dev, |
1348 | "%d not usable subdevice\n", | |
ed9eccbe DS |
1349 | insn->subdev); |
1350 | ret = -EINVAL; | |
1351 | break; | |
1352 | } | |
b077f2cd | 1353 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe | 1354 | if (!s->async) { |
272850f0 | 1355 | dev_dbg(dev->class_dev, "no async\n"); |
ed9eccbe DS |
1356 | ret = -EINVAL; |
1357 | break; | |
1358 | } | |
1359 | if (!s->async->inttrig) { | |
272850f0 | 1360 | dev_dbg(dev->class_dev, "no inttrig\n"); |
ed9eccbe DS |
1361 | ret = -EAGAIN; |
1362 | break; | |
1363 | } | |
5d06e3df | 1364 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1365 | if (ret >= 0) |
1366 | ret = 1; | |
1367 | break; | |
d7569ad7 SO |
1368 | case INSN_DEVICE_CONFIG: |
1369 | ret = check_insn_device_config_length(insn, data); | |
1370 | if (ret) | |
1371 | break; | |
1372 | ||
1373 | if (data[0] == INSN_DEVICE_CONFIG_GET_ROUTES) { | |
1374 | /* | |
1375 | * data[1] should be the number of _pairs_ that | |
1376 | * the memory can hold. | |
1377 | */ | |
1378 | data[1] = (insn->n - 2) / 2; | |
1379 | ret = get_valid_routes(dev, data); | |
1380 | break; | |
1381 | } | |
1382 | ||
1383 | /* other global device config instructions. */ | |
1384 | ret = dev->insn_device_config(dev, insn, data); | |
1385 | break; | |
ed9eccbe | 1386 | default: |
272850f0 | 1387 | dev_dbg(dev->class_dev, "invalid insn\n"); |
ed9eccbe DS |
1388 | ret = -EINVAL; |
1389 | break; | |
1390 | } | |
1391 | } else { | |
1392 | /* a subdevice instruction */ | |
790c5541 | 1393 | unsigned int maxdata; |
ed9eccbe DS |
1394 | |
1395 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1396 | dev_dbg(dev->class_dev, "subdevice %d out of range\n", |
1397 | insn->subdev); | |
ed9eccbe DS |
1398 | ret = -EINVAL; |
1399 | goto out; | |
1400 | } | |
b077f2cd | 1401 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1402 | |
1403 | if (s->type == COMEDI_SUBD_UNUSED) { | |
272850f0 HS |
1404 | dev_dbg(dev->class_dev, "%d not usable subdevice\n", |
1405 | insn->subdev); | |
ed9eccbe DS |
1406 | ret = -EIO; |
1407 | goto out; | |
1408 | } | |
1409 | ||
1410 | /* are we locked? (ioctl lock) */ | |
1411 | if (s->lock && s->lock != file) { | |
272850f0 | 1412 | dev_dbg(dev->class_dev, "device locked\n"); |
ed9eccbe DS |
1413 | ret = -EACCES; |
1414 | goto out; | |
1415 | } | |
1416 | ||
0fd0ca75 | 1417 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1418 | if (ret < 0) { |
ed9eccbe | 1419 | ret = -EINVAL; |
272850f0 | 1420 | dev_dbg(dev->class_dev, "bad chanspec\n"); |
ed9eccbe DS |
1421 | goto out; |
1422 | } | |
1423 | ||
1424 | if (s->busy) { | |
1425 | ret = -EBUSY; | |
1426 | goto out; | |
1427 | } | |
1428 | /* This looks arbitrary. It is. */ | |
30cc9bd6 | 1429 | s->busy = parse_insn; |
ed9eccbe DS |
1430 | switch (insn->insn) { |
1431 | case INSN_READ: | |
1432 | ret = s->insn_read(dev, s, insn, data); | |
22ca19d9 HS |
1433 | if (ret == -ETIMEDOUT) { |
1434 | dev_dbg(dev->class_dev, | |
1435 | "subdevice %d read instruction timed out\n", | |
1436 | s->index); | |
1437 | } | |
ed9eccbe DS |
1438 | break; |
1439 | case INSN_WRITE: | |
1440 | maxdata = s->maxdata_list | |
476b8477 GKH |
1441 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1442 | : s->maxdata; | |
ed9eccbe DS |
1443 | for (i = 0; i < insn->n; ++i) { |
1444 | if (data[i] > maxdata) { | |
1445 | ret = -EINVAL; | |
272850f0 HS |
1446 | dev_dbg(dev->class_dev, |
1447 | "bad data value(s)\n"); | |
ed9eccbe DS |
1448 | break; |
1449 | } | |
1450 | } | |
22ca19d9 | 1451 | if (ret == 0) { |
ed9eccbe | 1452 | ret = s->insn_write(dev, s, insn, data); |
22ca19d9 HS |
1453 | if (ret == -ETIMEDOUT) { |
1454 | dev_dbg(dev->class_dev, | |
1455 | "subdevice %d write instruction timed out\n", | |
1456 | s->index); | |
1457 | } | |
1458 | } | |
ed9eccbe DS |
1459 | break; |
1460 | case INSN_BITS: | |
1461 | if (insn->n != 2) { | |
1462 | ret = -EINVAL; | |
2f644ccf | 1463 | } else { |
a2aab8b4 IA |
1464 | /* |
1465 | * Most drivers ignore the base channel in | |
2f644ccf | 1466 | * insn->chanspec. Fix this here if |
a2aab8b4 IA |
1467 | * the subdevice has <= 32 channels. |
1468 | */ | |
36efbacd HS |
1469 | unsigned int orig_mask = data[0]; |
1470 | unsigned int shift = 0; | |
2f644ccf | 1471 | |
2f644ccf IA |
1472 | if (s->n_chan <= 32) { |
1473 | shift = CR_CHAN(insn->chanspec); | |
1474 | if (shift > 0) { | |
1475 | insn->chanspec = 0; | |
1476 | data[0] <<= shift; | |
1477 | data[1] <<= shift; | |
1478 | } | |
36efbacd | 1479 | } |
2f644ccf IA |
1480 | ret = s->insn_bits(dev, s, insn, data); |
1481 | data[0] = orig_mask; | |
1482 | if (shift > 0) | |
1483 | data[1] >>= shift; | |
ed9eccbe | 1484 | } |
ed9eccbe DS |
1485 | break; |
1486 | case INSN_CONFIG: | |
1487 | ret = check_insn_config_length(insn, data); | |
1488 | if (ret) | |
1489 | break; | |
1490 | ret = s->insn_config(dev, s, insn, data); | |
1491 | break; | |
1492 | default: | |
1493 | ret = -EINVAL; | |
1494 | break; | |
1495 | } | |
1496 | ||
1497 | s->busy = NULL; | |
1498 | } | |
1499 | ||
476b8477 | 1500 | out: |
ed9eccbe DS |
1501 | return ret; |
1502 | } | |
1503 | ||
5b6cbd87 | 1504 | /* |
18e01b24 IA |
1505 | * COMEDI_INSNLIST ioctl |
1506 | * synchronous instruction list | |
5b6cbd87 | 1507 | * |
18e01b24 IA |
1508 | * arg: |
1509 | * pointer to comedi_insnlist structure | |
5b6cbd87 | 1510 | * |
18e01b24 IA |
1511 | * reads: |
1512 | * comedi_insnlist structure | |
1513 | * array of comedi_insn structures from insnlist->insns pointer | |
1514 | * data (for writes) from insns[].data pointers | |
5b6cbd87 | 1515 | * |
18e01b24 IA |
1516 | * writes: |
1517 | * data (for reads) to insns[].data pointers | |
5b6cbd87 HS |
1518 | */ |
1519 | /* arbitrary limits */ | |
f8bc1b2e SO |
1520 | #define MIN_SAMPLES 16 |
1521 | #define MAX_SAMPLES 65536 | |
5b6cbd87 HS |
1522 | static int do_insnlist_ioctl(struct comedi_device *dev, |
1523 | struct comedi_insnlist __user *arg, void *file) | |
1524 | { | |
1525 | struct comedi_insnlist insnlist; | |
1526 | struct comedi_insn *insns = NULL; | |
1527 | unsigned int *data = NULL; | |
f8bc1b2e | 1528 | unsigned int max_n_data_required = MIN_SAMPLES; |
5b6cbd87 HS |
1529 | int i = 0; |
1530 | int ret = 0; | |
1531 | ||
77c21b62 | 1532 | lockdep_assert_held(&dev->mutex); |
5b6cbd87 HS |
1533 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) |
1534 | return -EFAULT; | |
1535 | ||
5b6cbd87 HS |
1536 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); |
1537 | if (!insns) { | |
5b6cbd87 HS |
1538 | ret = -ENOMEM; |
1539 | goto error; | |
1540 | } | |
1541 | ||
1542 | if (copy_from_user(insns, insnlist.insns, | |
1543 | sizeof(*insns) * insnlist.n_insns)) { | |
272850f0 | 1544 | dev_dbg(dev->class_dev, "copy_from_user failed\n"); |
5b6cbd87 HS |
1545 | ret = -EFAULT; |
1546 | goto error; | |
1547 | } | |
1548 | ||
f8bc1b2e SO |
1549 | /* Determine maximum memory needed for all instructions. */ |
1550 | for (i = 0; i < insnlist.n_insns; ++i) { | |
5b6cbd87 | 1551 | if (insns[i].n > MAX_SAMPLES) { |
272850f0 HS |
1552 | dev_dbg(dev->class_dev, |
1553 | "number of samples too large\n"); | |
5b6cbd87 HS |
1554 | ret = -EINVAL; |
1555 | goto error; | |
1556 | } | |
f8bc1b2e SO |
1557 | max_n_data_required = max(max_n_data_required, insns[i].n); |
1558 | } | |
1559 | ||
1560 | /* Allocate scratch space for all instruction data. */ | |
1561 | data = kmalloc_array(max_n_data_required, sizeof(unsigned int), | |
1562 | GFP_KERNEL); | |
1563 | if (!data) { | |
1564 | ret = -ENOMEM; | |
1565 | goto error; | |
1566 | } | |
1567 | ||
1568 | for (i = 0; i < insnlist.n_insns; ++i) { | |
5b6cbd87 HS |
1569 | if (insns[i].insn & INSN_MASK_WRITE) { |
1570 | if (copy_from_user(data, insns[i].data, | |
1571 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1572 | dev_dbg(dev->class_dev, |
1573 | "copy_from_user failed\n"); | |
5b6cbd87 HS |
1574 | ret = -EFAULT; |
1575 | goto error; | |
1576 | } | |
1577 | } | |
1578 | ret = parse_insn(dev, insns + i, data, file); | |
1579 | if (ret < 0) | |
1580 | goto error; | |
1581 | if (insns[i].insn & INSN_MASK_READ) { | |
1582 | if (copy_to_user(insns[i].data, data, | |
1583 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1584 | dev_dbg(dev->class_dev, |
1585 | "copy_to_user failed\n"); | |
5b6cbd87 HS |
1586 | ret = -EFAULT; |
1587 | goto error; | |
1588 | } | |
1589 | } | |
1590 | if (need_resched()) | |
1591 | schedule(); | |
1592 | } | |
1593 | ||
1594 | error: | |
1595 | kfree(insns); | |
1596 | kfree(data); | |
1597 | ||
1598 | if (ret < 0) | |
1599 | return ret; | |
1600 | return i; | |
1601 | } | |
1602 | ||
ed9eccbe | 1603 | /* |
18e01b24 IA |
1604 | * COMEDI_INSN ioctl |
1605 | * synchronous instruction | |
ed9eccbe | 1606 | * |
18e01b24 IA |
1607 | * arg: |
1608 | * pointer to comedi_insn structure | |
ed9eccbe | 1609 | * |
18e01b24 IA |
1610 | * reads: |
1611 | * comedi_insn structure | |
1612 | * data (for writes) from insn->data pointer | |
ed9eccbe | 1613 | * |
18e01b24 IA |
1614 | * writes: |
1615 | * data (for reads) to insn->data pointer | |
ed9eccbe | 1616 | */ |
92d0127c GKH |
1617 | static int do_insn_ioctl(struct comedi_device *dev, |
1618 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1619 | { |
90035c08 | 1620 | struct comedi_insn insn; |
790c5541 | 1621 | unsigned int *data = NULL; |
f8bc1b2e | 1622 | unsigned int n_data = MIN_SAMPLES; |
ed9eccbe DS |
1623 | int ret = 0; |
1624 | ||
77c21b62 | 1625 | lockdep_assert_held(&dev->mutex); |
56eec180 | 1626 | if (copy_from_user(&insn, arg, sizeof(insn))) |
f8bc1b2e | 1627 | return -EFAULT; |
56eec180 | 1628 | |
f8bc1b2e SO |
1629 | n_data = max(n_data, insn.n); |
1630 | ||
ed9eccbe | 1631 | /* This is where the behavior of insn and insnlist deviate. */ |
f8bc1b2e | 1632 | if (insn.n > MAX_SAMPLES) { |
ed9eccbe | 1633 | insn.n = MAX_SAMPLES; |
f8bc1b2e SO |
1634 | n_data = MAX_SAMPLES; |
1635 | } | |
1636 | ||
1637 | data = kmalloc_array(n_data, sizeof(unsigned int), GFP_KERNEL); | |
1638 | if (!data) { | |
1639 | ret = -ENOMEM; | |
1640 | goto error; | |
1641 | } | |
1642 | ||
ed9eccbe | 1643 | if (insn.insn & INSN_MASK_WRITE) { |
21fe2eea M |
1644 | if (copy_from_user(data, |
1645 | insn.data, | |
1646 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1647 | ret = -EFAULT; |
1648 | goto error; | |
1649 | } | |
1650 | } | |
1651 | ret = parse_insn(dev, &insn, data, file); | |
1652 | if (ret < 0) | |
1653 | goto error; | |
1654 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1655 | if (copy_to_user(insn.data, |
1656 | data, | |
1657 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1658 | ret = -EFAULT; |
1659 | goto error; | |
1660 | } | |
1661 | } | |
1662 | ret = insn.n; | |
1663 | ||
476b8477 GKH |
1664 | error: |
1665 | kfree(data); | |
ed9eccbe DS |
1666 | |
1667 | return ret; | |
1668 | } | |
1669 | ||
87ece583 HS |
1670 | static int __comedi_get_user_cmd(struct comedi_device *dev, |
1671 | struct comedi_cmd __user *arg, | |
1672 | struct comedi_cmd *cmd) | |
ed9eccbe | 1673 | { |
34c43922 | 1674 | struct comedi_subdevice *s; |
ed9eccbe | 1675 | |
77c21b62 | 1676 | lockdep_assert_held(&dev->mutex); |
87ece583 | 1677 | if (copy_from_user(cmd, arg, sizeof(*cmd))) { |
272850f0 | 1678 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe DS |
1679 | return -EFAULT; |
1680 | } | |
ed9eccbe | 1681 | |
87ece583 HS |
1682 | if (cmd->subdev >= dev->n_subdevices) { |
1683 | dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev); | |
ed9eccbe DS |
1684 | return -ENODEV; |
1685 | } | |
1686 | ||
87ece583 | 1687 | s = &dev->subdevices[cmd->subdev]; |
ed9eccbe DS |
1688 | |
1689 | if (s->type == COMEDI_SUBD_UNUSED) { | |
b2f48741 YD |
1690 | dev_dbg(dev->class_dev, "%d not valid subdevice\n", |
1691 | cmd->subdev); | |
ed9eccbe DS |
1692 | return -EIO; |
1693 | } | |
1694 | ||
1695 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
272850f0 | 1696 | dev_dbg(dev->class_dev, |
b2f48741 YD |
1697 | "subdevice %d does not support commands\n", |
1698 | cmd->subdev); | |
ed9eccbe DS |
1699 | return -EIO; |
1700 | } | |
1701 | ||
87ece583 HS |
1702 | /* make sure channel/gain list isn't too long */ |
1703 | if (cmd->chanlist_len > s->len_chanlist) { | |
1704 | dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n", | |
1705 | cmd->chanlist_len, s->len_chanlist); | |
1706 | return -EINVAL; | |
1707 | } | |
1708 | ||
5d070cf2 IA |
1709 | /* |
1710 | * Set the CMDF_WRITE flag to the correct state if the subdevice | |
1711 | * supports only "read" commands or only "write" commands. | |
1712 | */ | |
1713 | switch (s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) { | |
1714 | case SDF_CMD_READ: | |
1715 | cmd->flags &= ~CMDF_WRITE; | |
1716 | break; | |
1717 | case SDF_CMD_WRITE: | |
1718 | cmd->flags |= CMDF_WRITE; | |
1719 | break; | |
1720 | default: | |
1721 | break; | |
1722 | } | |
1723 | ||
87ece583 HS |
1724 | return 0; |
1725 | } | |
1726 | ||
c6cd0eef HS |
1727 | static int __comedi_get_user_chanlist(struct comedi_device *dev, |
1728 | struct comedi_subdevice *s, | |
1729 | unsigned int __user *user_chanlist, | |
1730 | struct comedi_cmd *cmd) | |
1731 | { | |
1732 | unsigned int *chanlist; | |
1733 | int ret; | |
1734 | ||
77c21b62 | 1735 | lockdep_assert_held(&dev->mutex); |
238b5ad8 | 1736 | cmd->chanlist = NULL; |
c6cd0eef HS |
1737 | chanlist = memdup_user(user_chanlist, |
1738 | cmd->chanlist_len * sizeof(unsigned int)); | |
1739 | if (IS_ERR(chanlist)) | |
1740 | return PTR_ERR(chanlist); | |
1741 | ||
1742 | /* make sure each element in channel/gain list is valid */ | |
1743 | ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist); | |
1744 | if (ret < 0) { | |
1745 | kfree(chanlist); | |
1746 | return ret; | |
1747 | } | |
1748 | ||
1749 | cmd->chanlist = chanlist; | |
1750 | ||
1751 | return 0; | |
1752 | } | |
1753 | ||
18e01b24 IA |
1754 | /* |
1755 | * COMEDI_CMD ioctl | |
1756 | * asynchronous acquisition command set-up | |
1757 | * | |
1758 | * arg: | |
1759 | * pointer to comedi_cmd structure | |
1760 | * | |
1761 | * reads: | |
1762 | * comedi_cmd structure | |
1763 | * channel/range list from cmd->chanlist pointer | |
1764 | * | |
1765 | * writes: | |
1766 | * possibly modified comedi_cmd structure (when -EAGAIN returned) | |
1767 | */ | |
87ece583 HS |
1768 | static int do_cmd_ioctl(struct comedi_device *dev, |
1769 | struct comedi_cmd __user *arg, void *file) | |
1770 | { | |
1771 | struct comedi_cmd cmd; | |
1772 | struct comedi_subdevice *s; | |
1773 | struct comedi_async *async; | |
1774 | unsigned int __user *user_chanlist; | |
1775 | int ret; | |
1776 | ||
77c21b62 IA |
1777 | lockdep_assert_held(&dev->mutex); |
1778 | ||
87ece583 HS |
1779 | /* get the user's cmd and do some simple validation */ |
1780 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1781 | if (ret) | |
1782 | return ret; | |
1783 | ||
1784 | /* save user's chanlist pointer so it can be restored later */ | |
1785 | user_chanlist = (unsigned int __user *)cmd.chanlist; | |
1786 | ||
1787 | s = &dev->subdevices[cmd.subdev]; | |
1788 | async = s->async; | |
1789 | ||
ed9eccbe DS |
1790 | /* are we locked? (ioctl lock) */ |
1791 | if (s->lock && s->lock != file) { | |
272850f0 | 1792 | dev_dbg(dev->class_dev, "subdevice locked\n"); |
ed9eccbe DS |
1793 | return -EACCES; |
1794 | } | |
1795 | ||
1796 | /* are we busy? */ | |
1797 | if (s->busy) { | |
272850f0 | 1798 | dev_dbg(dev->class_dev, "subdevice busy\n"); |
ed9eccbe DS |
1799 | return -EBUSY; |
1800 | } | |
ed9eccbe | 1801 | |
ed9eccbe | 1802 | /* make sure channel/gain list isn't too short */ |
88bc0574 | 1803 | if (cmd.chanlist_len < 1) { |
272850f0 | 1804 | dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n", |
88bc0574 | 1805 | cmd.chanlist_len); |
4b18f08b | 1806 | return -EINVAL; |
ed9eccbe DS |
1807 | } |
1808 | ||
88bc0574 | 1809 | async->cmd = cmd; |
ed9eccbe | 1810 | async->cmd.data = NULL; |
ed9eccbe | 1811 | |
c6cd0eef HS |
1812 | /* load channel/gain list */ |
1813 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd); | |
1814 | if (ret) | |
ed9eccbe | 1815 | goto cleanup; |
ed9eccbe DS |
1816 | |
1817 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1818 | ||
b0446a21 | 1819 | if (async->cmd.flags & CMDF_BOGUS || ret) { |
272850f0 | 1820 | dev_dbg(dev->class_dev, "test returned %d\n", ret); |
88bc0574 | 1821 | cmd = async->cmd; |
476b8477 | 1822 | /* restore chanlist pointer before copying back */ |
95bc359f | 1823 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 | 1824 | cmd.data = NULL; |
bc252fd1 | 1825 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1826 | dev_dbg(dev->class_dev, "fault writing cmd\n"); |
ed9eccbe DS |
1827 | ret = -EFAULT; |
1828 | goto cleanup; | |
1829 | } | |
1830 | ret = -EAGAIN; | |
1831 | goto cleanup; | |
1832 | } | |
1833 | ||
1834 | if (!async->prealloc_bufsz) { | |
1835 | ret = -ENOMEM; | |
272850f0 | 1836 | dev_dbg(dev->class_dev, "no buffer (?)\n"); |
ed9eccbe DS |
1837 | goto cleanup; |
1838 | } | |
1839 | ||
fcc18a9a | 1840 | comedi_buf_reset(s); |
ed9eccbe | 1841 | |
781f933c | 1842 | async->cb_mask = COMEDI_CB_BLOCK | COMEDI_CB_CANCEL_MASK; |
d8bff6e3 | 1843 | if (async->cmd.flags & CMDF_WAKE_EOS) |
ed9eccbe | 1844 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe | 1845 | |
cc64ea42 IA |
1846 | comedi_update_subdevice_runflags(s, COMEDI_SRF_BUSY_MASK, |
1847 | COMEDI_SRF_RUNNING); | |
ed9eccbe | 1848 | |
84bb0bcc HS |
1849 | /* |
1850 | * Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid | |
1851 | * race with comedi_read() or comedi_write(). | |
1852 | */ | |
4b18f08b | 1853 | s->busy = file; |
ed9eccbe DS |
1854 | ret = s->do_cmd(dev, s); |
1855 | if (ret == 0) | |
1856 | return 0; | |
1857 | ||
476b8477 | 1858 | cleanup: |
ed9eccbe DS |
1859 | do_become_nonbusy(dev, s); |
1860 | ||
1861 | return ret; | |
1862 | } | |
1863 | ||
1864 | /* | |
18e01b24 | 1865 | * COMEDI_CMDTEST ioctl |
69e98df7 | 1866 | * asynchronous acquisition command testing |
18e01b24 IA |
1867 | * |
1868 | * arg: | |
1869 | * pointer to comedi_cmd structure | |
1870 | * | |
1871 | * reads: | |
1872 | * comedi_cmd structure | |
1873 | * channel/range list from cmd->chanlist pointer | |
1874 | * | |
1875 | * writes: | |
1876 | * possibly modified comedi_cmd structure | |
1877 | */ | |
92d0127c GKH |
1878 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1879 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1880 | { |
f8348677 | 1881 | struct comedi_cmd cmd; |
34c43922 | 1882 | struct comedi_subdevice *s; |
95bc359f | 1883 | unsigned int __user *user_chanlist; |
87ece583 HS |
1884 | int ret; |
1885 | ||
77c21b62 IA |
1886 | lockdep_assert_held(&dev->mutex); |
1887 | ||
87ece583 HS |
1888 | /* get the user's cmd and do some simple validation */ |
1889 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1890 | if (ret) | |
1891 | return ret; | |
ed9eccbe | 1892 | |
476b8477 | 1893 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1894 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1895 | |
f8348677 | 1896 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe | 1897 | |
6cab7a37 IA |
1898 | /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */ |
1899 | if (user_chanlist) { | |
1900 | /* load channel/gain list */ | |
1901 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd); | |
1902 | if (ret) | |
1903 | return ret; | |
1904 | } | |
ed9eccbe | 1905 | |
f8348677 | 1906 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1907 | |
238b5ad8 IA |
1908 | kfree(cmd.chanlist); /* free kernel copy of user chanlist */ |
1909 | ||
476b8477 | 1910 | /* restore chanlist pointer before copying back */ |
95bc359f | 1911 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1912 | |
bc252fd1 | 1913 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1914 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe | 1915 | ret = -EFAULT; |
ed9eccbe | 1916 | } |
c6cd0eef | 1917 | |
ed9eccbe DS |
1918 | return ret; |
1919 | } | |
1920 | ||
1921 | /* | |
18e01b24 IA |
1922 | * COMEDI_LOCK ioctl |
1923 | * lock subdevice | |
1924 | * | |
1925 | * arg: | |
1926 | * subdevice number | |
1927 | * | |
1928 | * reads: | |
1929 | * nothing | |
1930 | * | |
1931 | * writes: | |
1932 | * nothing | |
1933 | */ | |
c1a6eac1 | 1934 | static int do_lock_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1935 | void *file) |
ed9eccbe DS |
1936 | { |
1937 | int ret = 0; | |
1938 | unsigned long flags; | |
34c43922 | 1939 | struct comedi_subdevice *s; |
ed9eccbe | 1940 | |
77c21b62 | 1941 | lockdep_assert_held(&dev->mutex); |
ed9eccbe DS |
1942 | if (arg >= dev->n_subdevices) |
1943 | return -EINVAL; | |
b077f2cd | 1944 | s = &dev->subdevices[arg]; |
ed9eccbe | 1945 | |
5f74ea14 | 1946 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1947 | if (s->busy || s->lock) |
ed9eccbe | 1948 | ret = -EBUSY; |
476b8477 | 1949 | else |
ed9eccbe | 1950 | s->lock = file; |
5f74ea14 | 1951 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1952 | |
ed9eccbe DS |
1953 | return ret; |
1954 | } | |
1955 | ||
1956 | /* | |
18e01b24 IA |
1957 | * COMEDI_UNLOCK ioctl |
1958 | * unlock subdevice | |
1959 | * | |
1960 | * arg: | |
1961 | * subdevice number | |
1962 | * | |
1963 | * reads: | |
1964 | * nothing | |
1965 | * | |
1966 | * writes: | |
1967 | * nothing | |
1968 | */ | |
c1a6eac1 | 1969 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1970 | void *file) |
ed9eccbe | 1971 | { |
34c43922 | 1972 | struct comedi_subdevice *s; |
ed9eccbe | 1973 | |
77c21b62 | 1974 | lockdep_assert_held(&dev->mutex); |
ed9eccbe DS |
1975 | if (arg >= dev->n_subdevices) |
1976 | return -EINVAL; | |
b077f2cd | 1977 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1978 | |
1979 | if (s->busy) | |
1980 | return -EBUSY; | |
1981 | ||
1982 | if (s->lock && s->lock != file) | |
1983 | return -EACCES; | |
1984 | ||
90ac0764 | 1985 | if (s->lock == file) |
ed9eccbe | 1986 | s->lock = NULL; |
ed9eccbe DS |
1987 | |
1988 | return 0; | |
1989 | } | |
1990 | ||
1991 | /* | |
18e01b24 IA |
1992 | * COMEDI_CANCEL ioctl |
1993 | * cancel asynchronous acquisition | |
1994 | * | |
1995 | * arg: | |
1996 | * subdevice number | |
1997 | * | |
1998 | * reads: | |
1999 | * nothing | |
2000 | * | |
2001 | * writes: | |
2002 | * nothing | |
2003 | */ | |
c1a6eac1 | 2004 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 2005 | void *file) |
ed9eccbe | 2006 | { |
34c43922 | 2007 | struct comedi_subdevice *s; |
ed9eccbe | 2008 | |
77c21b62 | 2009 | lockdep_assert_held(&dev->mutex); |
ed9eccbe DS |
2010 | if (arg >= dev->n_subdevices) |
2011 | return -EINVAL; | |
b077f2cd | 2012 | s = &dev->subdevices[arg]; |
88cc30cf | 2013 | if (!s->async) |
ed9eccbe DS |
2014 | return -EINVAL; |
2015 | ||
ed9eccbe DS |
2016 | if (!s->busy) |
2017 | return 0; | |
2018 | ||
2019 | if (s->busy != file) | |
2020 | return -EBUSY; | |
2021 | ||
fe43ec53 | 2022 | return do_cancel(dev, s); |
ed9eccbe DS |
2023 | } |
2024 | ||
2025 | /* | |
18e01b24 IA |
2026 | * COMEDI_POLL ioctl |
2027 | * instructs driver to synchronize buffers | |
2028 | * | |
2029 | * arg: | |
2030 | * subdevice number | |
2031 | * | |
2032 | * reads: | |
2033 | * nothing | |
2034 | * | |
2035 | * writes: | |
2036 | * nothing | |
2037 | */ | |
c1a6eac1 | 2038 | static int do_poll_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 2039 | void *file) |
ed9eccbe | 2040 | { |
34c43922 | 2041 | struct comedi_subdevice *s; |
ed9eccbe | 2042 | |
77c21b62 | 2043 | lockdep_assert_held(&dev->mutex); |
ed9eccbe DS |
2044 | if (arg >= dev->n_subdevices) |
2045 | return -EINVAL; | |
b077f2cd | 2046 | s = &dev->subdevices[arg]; |
ed9eccbe | 2047 | |
ed9eccbe DS |
2048 | if (!s->busy) |
2049 | return 0; | |
2050 | ||
2051 | if (s->busy != file) | |
2052 | return -EBUSY; | |
2053 | ||
2054 | if (s->poll) | |
2055 | return s->poll(dev, s); | |
2056 | ||
2057 | return -EINVAL; | |
2058 | } | |
2059 | ||
c299a678 IA |
2060 | /* |
2061 | * COMEDI_SETRSUBD ioctl | |
2062 | * sets the current "read" subdevice on a per-file basis | |
2063 | * | |
2064 | * arg: | |
2065 | * subdevice number | |
2066 | * | |
2067 | * reads: | |
2068 | * nothing | |
2069 | * | |
2070 | * writes: | |
2071 | * nothing | |
2072 | */ | |
2073 | static int do_setrsubd_ioctl(struct comedi_device *dev, unsigned long arg, | |
2074 | struct file *file) | |
2075 | { | |
2076 | struct comedi_file *cfp = file->private_data; | |
2077 | struct comedi_subdevice *s_old, *s_new; | |
2078 | ||
77c21b62 | 2079 | lockdep_assert_held(&dev->mutex); |
c299a678 IA |
2080 | if (arg >= dev->n_subdevices) |
2081 | return -EINVAL; | |
2082 | ||
2083 | s_new = &dev->subdevices[arg]; | |
2084 | s_old = comedi_file_read_subdevice(file); | |
2085 | if (s_old == s_new) | |
2086 | return 0; /* no change */ | |
2087 | ||
2088 | if (!(s_new->subdev_flags & SDF_CMD_READ)) | |
2089 | return -EINVAL; | |
2090 | ||
2091 | /* | |
2092 | * Check the file isn't still busy handling a "read" command on the | |
2093 | * old subdevice (if any). | |
2094 | */ | |
2095 | if (s_old && s_old->busy == file && s_old->async && | |
2096 | !(s_old->async->cmd.flags & CMDF_WRITE)) | |
2097 | return -EBUSY; | |
2098 | ||
34d34732 | 2099 | WRITE_ONCE(cfp->read_subdev, s_new); |
c299a678 IA |
2100 | return 0; |
2101 | } | |
2102 | ||
2103 | /* | |
2104 | * COMEDI_SETWSUBD ioctl | |
2105 | * sets the current "write" subdevice on a per-file basis | |
2106 | * | |
2107 | * arg: | |
2108 | * subdevice number | |
2109 | * | |
2110 | * reads: | |
2111 | * nothing | |
2112 | * | |
2113 | * writes: | |
2114 | * nothing | |
2115 | */ | |
2116 | static int do_setwsubd_ioctl(struct comedi_device *dev, unsigned long arg, | |
2117 | struct file *file) | |
2118 | { | |
2119 | struct comedi_file *cfp = file->private_data; | |
2120 | struct comedi_subdevice *s_old, *s_new; | |
2121 | ||
77c21b62 | 2122 | lockdep_assert_held(&dev->mutex); |
c299a678 IA |
2123 | if (arg >= dev->n_subdevices) |
2124 | return -EINVAL; | |
2125 | ||
2126 | s_new = &dev->subdevices[arg]; | |
2127 | s_old = comedi_file_write_subdevice(file); | |
2128 | if (s_old == s_new) | |
2129 | return 0; /* no change */ | |
2130 | ||
2131 | if (!(s_new->subdev_flags & SDF_CMD_WRITE)) | |
2132 | return -EINVAL; | |
2133 | ||
2134 | /* | |
2135 | * Check the file isn't still busy handling a "write" command on the | |
2136 | * old subdevice (if any). | |
2137 | */ | |
2138 | if (s_old && s_old->busy == file && s_old->async && | |
2139 | (s_old->async->cmd.flags & CMDF_WRITE)) | |
2140 | return -EBUSY; | |
2141 | ||
34d34732 | 2142 | WRITE_ONCE(cfp->write_subdev, s_new); |
c299a678 IA |
2143 | return 0; |
2144 | } | |
2145 | ||
47db6d58 HS |
2146 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
2147 | unsigned long arg) | |
2148 | { | |
d4d47895 | 2149 | unsigned int minor = iminor(file_inode(file)); |
20f083c0 IA |
2150 | struct comedi_file *cfp = file->private_data; |
2151 | struct comedi_device *dev = cfp->dev; | |
47db6d58 HS |
2152 | int rc; |
2153 | ||
47db6d58 HS |
2154 | mutex_lock(&dev->mutex); |
2155 | ||
a2aab8b4 IA |
2156 | /* |
2157 | * Device config is special, because it must work on | |
2158 | * an unconfigured device. | |
2159 | */ | |
47db6d58 | 2160 | if (cmd == COMEDI_DEVCONFIG) { |
754ab5c0 IA |
2161 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
2162 | /* Device config not appropriate on non-board minors. */ | |
2163 | rc = -ENOTTY; | |
2164 | goto done; | |
2165 | } | |
47db6d58 HS |
2166 | rc = do_devconfig_ioctl(dev, |
2167 | (struct comedi_devconfig __user *)arg); | |
8ab4ed6e IA |
2168 | if (rc == 0) { |
2169 | if (arg == 0 && | |
2170 | dev->minor >= comedi_num_legacy_minors) { | |
a2aab8b4 IA |
2171 | /* |
2172 | * Successfully unconfigured a dynamically | |
2173 | * allocated device. Try and remove it. | |
2174 | */ | |
db210da2 | 2175 | if (comedi_clear_board_dev(dev)) { |
8ab4ed6e | 2176 | mutex_unlock(&dev->mutex); |
cb6b79de | 2177 | comedi_free_board_dev(dev); |
8ab4ed6e IA |
2178 | return rc; |
2179 | } | |
2180 | } | |
2181 | } | |
47db6d58 HS |
2182 | goto done; |
2183 | } | |
2184 | ||
2185 | if (!dev->attached) { | |
272850f0 | 2186 | dev_dbg(dev->class_dev, "no driver attached\n"); |
47db6d58 HS |
2187 | rc = -ENODEV; |
2188 | goto done; | |
2189 | } | |
2190 | ||
2191 | switch (cmd) { | |
2192 | case COMEDI_BUFCONFIG: | |
2193 | rc = do_bufconfig_ioctl(dev, | |
2194 | (struct comedi_bufconfig __user *)arg); | |
2195 | break; | |
2196 | case COMEDI_DEVINFO: | |
2197 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
2198 | file); | |
2199 | break; | |
2200 | case COMEDI_SUBDINFO: | |
2201 | rc = do_subdinfo_ioctl(dev, | |
2202 | (struct comedi_subdinfo __user *)arg, | |
2203 | file); | |
2204 | break; | |
3fbfd222 AV |
2205 | case COMEDI_CHANINFO: { |
2206 | struct comedi_chaninfo it; | |
2207 | if (copy_from_user(&it, (void __user *)arg, sizeof(it))) | |
2208 | rc = -EFAULT; | |
2209 | else | |
2210 | rc = do_chaninfo_ioctl(dev, &it); | |
47db6d58 | 2211 | break; |
3fbfd222 | 2212 | } |
47db6d58 HS |
2213 | case COMEDI_RANGEINFO: |
2214 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
2215 | break; | |
2216 | case COMEDI_BUFINFO: | |
2217 | rc = do_bufinfo_ioctl(dev, | |
2218 | (struct comedi_bufinfo __user *)arg, | |
2219 | file); | |
2220 | break; | |
2221 | case COMEDI_LOCK: | |
2222 | rc = do_lock_ioctl(dev, arg, file); | |
2223 | break; | |
2224 | case COMEDI_UNLOCK: | |
2225 | rc = do_unlock_ioctl(dev, arg, file); | |
2226 | break; | |
2227 | case COMEDI_CANCEL: | |
2228 | rc = do_cancel_ioctl(dev, arg, file); | |
2229 | break; | |
2230 | case COMEDI_CMD: | |
2231 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
2232 | break; | |
2233 | case COMEDI_CMDTEST: | |
2234 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
2235 | file); | |
2236 | break; | |
2237 | case COMEDI_INSNLIST: | |
2238 | rc = do_insnlist_ioctl(dev, | |
2239 | (struct comedi_insnlist __user *)arg, | |
2240 | file); | |
2241 | break; | |
2242 | case COMEDI_INSN: | |
2243 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
2244 | file); | |
2245 | break; | |
2246 | case COMEDI_POLL: | |
2247 | rc = do_poll_ioctl(dev, arg, file); | |
2248 | break; | |
c299a678 IA |
2249 | case COMEDI_SETRSUBD: |
2250 | rc = do_setrsubd_ioctl(dev, arg, file); | |
2251 | break; | |
2252 | case COMEDI_SETWSUBD: | |
2253 | rc = do_setwsubd_ioctl(dev, arg, file); | |
2254 | break; | |
47db6d58 HS |
2255 | default: |
2256 | rc = -ENOTTY; | |
2257 | break; | |
2258 | } | |
2259 | ||
2260 | done: | |
2261 | mutex_unlock(&dev->mutex); | |
2262 | return rc; | |
2263 | } | |
2264 | ||
df30b21c FV |
2265 | static void comedi_vm_open(struct vm_area_struct *area) |
2266 | { | |
af93da31 | 2267 | struct comedi_buf_map *bm; |
df30b21c | 2268 | |
af93da31 IA |
2269 | bm = area->vm_private_data; |
2270 | comedi_buf_map_get(bm); | |
df30b21c FV |
2271 | } |
2272 | ||
2273 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 2274 | { |
af93da31 | 2275 | struct comedi_buf_map *bm; |
ed9eccbe | 2276 | |
af93da31 IA |
2277 | bm = area->vm_private_data; |
2278 | comedi_buf_map_put(bm); | |
ed9eccbe DS |
2279 | } |
2280 | ||
255364f7 IA |
2281 | static int comedi_vm_access(struct vm_area_struct *vma, unsigned long addr, |
2282 | void *buf, int len, int write) | |
2283 | { | |
2284 | struct comedi_buf_map *bm = vma->vm_private_data; | |
2285 | unsigned long offset = | |
2286 | addr - vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT); | |
2287 | ||
2288 | if (len < 0) | |
2289 | return -EINVAL; | |
2290 | if (len > vma->vm_end - addr) | |
2291 | len = vma->vm_end - addr; | |
2292 | return comedi_buf_map_access(bm, offset, buf, len, write); | |
2293 | } | |
2294 | ||
7cbea8dc | 2295 | static const struct vm_operations_struct comedi_vm_ops = { |
df30b21c FV |
2296 | .open = comedi_vm_open, |
2297 | .close = comedi_vm_close, | |
255364f7 | 2298 | .access = comedi_vm_access, |
ed9eccbe DS |
2299 | }; |
2300 | ||
2301 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
2302 | { | |
20f083c0 IA |
2303 | struct comedi_file *cfp = file->private_data; |
2304 | struct comedi_device *dev = cfp->dev; | |
a52840a9 HS |
2305 | struct comedi_subdevice *s; |
2306 | struct comedi_async *async; | |
b34aa86f | 2307 | struct comedi_buf_map *bm = NULL; |
e3647214 | 2308 | struct comedi_buf_page *buf; |
ed9eccbe DS |
2309 | unsigned long start = vma->vm_start; |
2310 | unsigned long size; | |
2311 | int n_pages; | |
2312 | int i; | |
e3647214 | 2313 | int retval = 0; |
3ffab428 | 2314 | |
b34aa86f IA |
2315 | /* |
2316 | * 'trylock' avoids circular dependency with current->mm->mmap_sem | |
2317 | * and down-reading &dev->attach_lock should normally succeed without | |
2318 | * contention unless the device is in the process of being attached | |
2319 | * or detached. | |
2320 | */ | |
2321 | if (!down_read_trylock(&dev->attach_lock)) | |
2322 | return -EAGAIN; | |
a52840a9 | 2323 | |
ed9eccbe | 2324 | if (!dev->attached) { |
272850f0 | 2325 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ed9eccbe DS |
2326 | retval = -ENODEV; |
2327 | goto done; | |
2328 | } | |
a52840a9 | 2329 | |
476b8477 | 2330 | if (vma->vm_flags & VM_WRITE) |
20f083c0 | 2331 | s = comedi_file_write_subdevice(file); |
476b8477 | 2332 | else |
20f083c0 | 2333 | s = comedi_file_read_subdevice(file); |
a52840a9 | 2334 | if (!s) { |
ed9eccbe DS |
2335 | retval = -EINVAL; |
2336 | goto done; | |
2337 | } | |
a52840a9 | 2338 | |
ed9eccbe | 2339 | async = s->async; |
a52840a9 | 2340 | if (!async) { |
ed9eccbe DS |
2341 | retval = -EINVAL; |
2342 | goto done; | |
2343 | } | |
2344 | ||
2345 | if (vma->vm_pgoff != 0) { | |
272850f0 | 2346 | dev_dbg(dev->class_dev, "mmap() offset must be 0.\n"); |
ed9eccbe DS |
2347 | retval = -EINVAL; |
2348 | goto done; | |
2349 | } | |
2350 | ||
2351 | size = vma->vm_end - vma->vm_start; | |
2352 | if (size > async->prealloc_bufsz) { | |
2353 | retval = -EFAULT; | |
2354 | goto done; | |
2355 | } | |
44b8c793 | 2356 | if (offset_in_page(size)) { |
ed9eccbe DS |
2357 | retval = -EFAULT; |
2358 | goto done; | |
2359 | } | |
2360 | ||
ec9d0754 | 2361 | n_pages = vma_pages(vma); |
b34aa86f IA |
2362 | |
2363 | /* get reference to current buf map (if any) */ | |
2364 | bm = comedi_buf_map_from_subdev_get(s); | |
af93da31 IA |
2365 | if (!bm || n_pages > bm->n_pages) { |
2366 | retval = -EINVAL; | |
2367 | goto done; | |
2368 | } | |
e3647214 IA |
2369 | if (bm->dma_dir != DMA_NONE) { |
2370 | /* | |
2371 | * DMA buffer was allocated as a single block. | |
2372 | * Address is in page_list[0]. | |
2373 | */ | |
2374 | buf = &bm->page_list[0]; | |
2375 | retval = dma_mmap_coherent(bm->dma_hw_dev, vma, buf->virt_addr, | |
2376 | buf->dma_addr, n_pages * PAGE_SIZE); | |
2377 | } else { | |
2378 | for (i = 0; i < n_pages; ++i) { | |
2379 | unsigned long pfn; | |
2380 | ||
2381 | buf = &bm->page_list[i]; | |
2382 | pfn = page_to_pfn(virt_to_page(buf->virt_addr)); | |
2383 | retval = remap_pfn_range(vma, start, pfn, PAGE_SIZE, | |
2384 | PAGE_SHARED); | |
2385 | if (retval) | |
2386 | break; | |
a52840a9 | 2387 | |
e3647214 | 2388 | start += PAGE_SIZE; |
ed9eccbe | 2389 | } |
ed9eccbe DS |
2390 | } |
2391 | ||
e3647214 IA |
2392 | if (retval == 0) { |
2393 | vma->vm_ops = &comedi_vm_ops; | |
2394 | vma->vm_private_data = bm; | |
ed9eccbe | 2395 | |
e3647214 IA |
2396 | vma->vm_ops->open(vma); |
2397 | } | |
ed9eccbe | 2398 | |
476b8477 | 2399 | done: |
b34aa86f IA |
2400 | up_read(&dev->attach_lock); |
2401 | comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */ | |
ed9eccbe DS |
2402 | return retval; |
2403 | } | |
2404 | ||
afc9a42b | 2405 | static __poll_t comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe | 2406 | { |
afc9a42b | 2407 | __poll_t mask = 0; |
20f083c0 IA |
2408 | struct comedi_file *cfp = file->private_data; |
2409 | struct comedi_device *dev = cfp->dev; | |
322146d5 | 2410 | struct comedi_subdevice *s, *s_read; |
3ffab428 | 2411 | |
d5eb3a74 | 2412 | down_read(&dev->attach_lock); |
ca081b1d | 2413 | |
ed9eccbe | 2414 | if (!dev->attached) { |
272850f0 | 2415 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ca081b1d | 2416 | goto done; |
ed9eccbe DS |
2417 | } |
2418 | ||
20f083c0 | 2419 | s = comedi_file_read_subdevice(file); |
322146d5 | 2420 | s_read = s; |
cc400e18 | 2421 | if (s && s->async) { |
ca081b1d | 2422 | poll_wait(file, &s->async->wait_head, wait); |
3834234f | 2423 | if (s->busy != file || !comedi_is_subdevice_running(s) || |
662c722b | 2424 | (s->async->cmd.flags & CMDF_WRITE) || |
e9edef3a | 2425 | comedi_buf_read_n_available(s) > 0) |
a9a08845 | 2426 | mask |= EPOLLIN | EPOLLRDNORM; |
ed9eccbe | 2427 | } |
ca081b1d | 2428 | |
20f083c0 | 2429 | s = comedi_file_write_subdevice(file); |
cc400e18 | 2430 | if (s && s->async) { |
c39e050d | 2431 | unsigned int bps = comedi_bytes_per_sample(s); |
ca081b1d | 2432 | |
322146d5 IA |
2433 | if (s != s_read) |
2434 | poll_wait(file, &s->async->wait_head, wait); | |
3834234f | 2435 | if (s->busy != file || !comedi_is_subdevice_running(s) || |
662c722b | 2436 | !(s->async->cmd.flags & CMDF_WRITE) || |
ecf04ed3 | 2437 | comedi_buf_write_n_available(s) >= bps) |
a9a08845 | 2438 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed9eccbe DS |
2439 | } |
2440 | ||
ca081b1d | 2441 | done: |
d5eb3a74 | 2442 | up_read(&dev->attach_lock); |
ed9eccbe DS |
2443 | return mask; |
2444 | } | |
2445 | ||
92d0127c GKH |
2446 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
2447 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 2448 | { |
34c43922 | 2449 | struct comedi_subdevice *s; |
d163679c | 2450 | struct comedi_async *async; |
84a185ec IA |
2451 | unsigned int n, m; |
2452 | ssize_t count = 0; | |
2453 | int retval = 0; | |
ed9eccbe | 2454 | DECLARE_WAITQUEUE(wait, current); |
20f083c0 IA |
2455 | struct comedi_file *cfp = file->private_data; |
2456 | struct comedi_device *dev = cfp->dev; | |
06181de1 | 2457 | bool become_nonbusy = false; |
9329f139 IA |
2458 | bool attach_locked; |
2459 | unsigned int old_detach_count; | |
3ffab428 | 2460 | |
9329f139 IA |
2461 | /* Protect against device detachment during operation. */ |
2462 | down_read(&dev->attach_lock); | |
2463 | attach_locked = true; | |
2464 | old_detach_count = dev->detach_count; | |
2465 | ||
ed9eccbe | 2466 | if (!dev->attached) { |
272850f0 | 2467 | dev_dbg(dev->class_dev, "no driver attached\n"); |
9329f139 IA |
2468 | retval = -ENODEV; |
2469 | goto out; | |
ed9eccbe DS |
2470 | } |
2471 | ||
20f083c0 | 2472 | s = comedi_file_write_subdevice(file); |
9329f139 IA |
2473 | if (!s || !s->async) { |
2474 | retval = -EIO; | |
2475 | goto out; | |
2476 | } | |
2714b019 | 2477 | |
ed9eccbe | 2478 | async = s->async; |
3318c7ad | 2479 | if (s->busy != file || !(async->cmd.flags & CMDF_WRITE)) { |
f7398509 IA |
2480 | retval = -EINVAL; |
2481 | goto out; | |
2482 | } | |
2714b019 | 2483 | |
ed9eccbe | 2484 | add_wait_queue(&async->wait_head, &wait); |
06181de1 | 2485 | while (count == 0 && !retval) { |
d4d47895 | 2486 | unsigned int runflags; |
35a7475d | 2487 | unsigned int wp, n1, n2; |
b183a836 | 2488 | |
ed9eccbe DS |
2489 | set_current_state(TASK_INTERRUPTIBLE); |
2490 | ||
b183a836 IA |
2491 | runflags = comedi_get_subdevice_runflags(s); |
2492 | if (!comedi_is_runflags_running(runflags)) { | |
06181de1 IA |
2493 | if (comedi_is_runflags_in_error(runflags)) |
2494 | retval = -EPIPE; | |
28a60c45 IA |
2495 | if (retval || nbytes) |
2496 | become_nonbusy = true; | |
d2611540 IA |
2497 | break; |
2498 | } | |
28a60c45 IA |
2499 | if (nbytes == 0) |
2500 | break; | |
d2611540 | 2501 | |
591c5f8a IA |
2502 | /* Allocate all free buffer space. */ |
2503 | comedi_buf_write_alloc(s, async->prealloc_bufsz); | |
2504 | m = comedi_buf_write_n_allocated(s); | |
591c5f8a | 2505 | n = min_t(size_t, m, nbytes); |
ed9eccbe DS |
2506 | |
2507 | if (n == 0) { | |
ed9eccbe DS |
2508 | if (file->f_flags & O_NONBLOCK) { |
2509 | retval = -EAGAIN; | |
2510 | break; | |
2511 | } | |
6a9ce6b6 | 2512 | schedule(); |
ed9eccbe DS |
2513 | if (signal_pending(current)) { |
2514 | retval = -ERESTARTSYS; | |
2515 | break; | |
2516 | } | |
3318c7ad IA |
2517 | if (s->busy != file || |
2518 | !(async->cmd.flags & CMDF_WRITE)) { | |
f7398509 IA |
2519 | retval = -EINVAL; |
2520 | break; | |
2521 | } | |
ed9eccbe DS |
2522 | continue; |
2523 | } | |
2524 | ||
cef98864 | 2525 | set_current_state(TASK_RUNNING); |
35a7475d IA |
2526 | wp = async->buf_write_ptr; |
2527 | n1 = min(n, async->prealloc_bufsz - wp); | |
2528 | n2 = n - n1; | |
2529 | m = copy_from_user(async->prealloc_buf + wp, buf, n1); | |
2530 | if (m) | |
2531 | m += n2; | |
2532 | else if (n2) | |
2533 | m = copy_from_user(async->prealloc_buf, buf + n1, n2); | |
ed9eccbe DS |
2534 | if (m) { |
2535 | n -= m; | |
2536 | retval = -EFAULT; | |
2537 | } | |
940dd35d | 2538 | comedi_buf_write_free(s, n); |
ed9eccbe DS |
2539 | |
2540 | count += n; | |
2541 | nbytes -= n; | |
2542 | ||
2543 | buf += n; | |
ed9eccbe | 2544 | } |
06181de1 | 2545 | remove_wait_queue(&async->wait_head, &wait); |
ed9eccbe | 2546 | set_current_state(TASK_RUNNING); |
06181de1 IA |
2547 | if (become_nonbusy && count == 0) { |
2548 | struct comedi_subdevice *new_s; | |
2549 | ||
2550 | /* | |
2551 | * To avoid deadlock, cannot acquire dev->mutex | |
2552 | * while dev->attach_lock is held. | |
2553 | */ | |
2554 | up_read(&dev->attach_lock); | |
2555 | attach_locked = false; | |
2556 | mutex_lock(&dev->mutex); | |
2557 | /* | |
2558 | * Check device hasn't become detached behind our back. | |
2559 | * Checking dev->detach_count is unchanged ought to be | |
2560 | * sufficient (unless there have been 2**32 detaches in the | |
2561 | * meantime!), but check the subdevice pointer as well just in | |
2562 | * case. | |
ed65bba3 IA |
2563 | * |
2564 | * Also check the subdevice is still in a suitable state to | |
2565 | * become non-busy in case it changed behind our back. | |
06181de1 IA |
2566 | */ |
2567 | new_s = comedi_file_write_subdevice(file); | |
2568 | if (dev->attached && old_detach_count == dev->detach_count && | |
ed65bba3 IA |
2569 | s == new_s && new_s->async == async && s->busy == file && |
2570 | (async->cmd.flags & CMDF_WRITE) && | |
2571 | !comedi_is_subdevice_running(s)) | |
06181de1 IA |
2572 | do_become_nonbusy(dev, s); |
2573 | mutex_unlock(&dev->mutex); | |
2574 | } | |
2575 | out: | |
9329f139 IA |
2576 | if (attach_locked) |
2577 | up_read(&dev->attach_lock); | |
ed9eccbe | 2578 | |
476b8477 | 2579 | return count ? count : retval; |
ed9eccbe DS |
2580 | } |
2581 | ||
92d0127c | 2582 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
36efbacd | 2583 | loff_t *offset) |
ed9eccbe | 2584 | { |
34c43922 | 2585 | struct comedi_subdevice *s; |
d163679c | 2586 | struct comedi_async *async; |
76e8e7d4 IA |
2587 | unsigned int n, m; |
2588 | ssize_t count = 0; | |
2589 | int retval = 0; | |
ed9eccbe | 2590 | DECLARE_WAITQUEUE(wait, current); |
20f083c0 IA |
2591 | struct comedi_file *cfp = file->private_data; |
2592 | struct comedi_device *dev = cfp->dev; | |
45c2bc55 IA |
2593 | unsigned int old_detach_count; |
2594 | bool become_nonbusy = false; | |
2595 | bool attach_locked; | |
3ffab428 | 2596 | |
45c2bc55 IA |
2597 | /* Protect against device detachment during operation. */ |
2598 | down_read(&dev->attach_lock); | |
2599 | attach_locked = true; | |
2600 | old_detach_count = dev->detach_count; | |
2601 | ||
ed9eccbe | 2602 | if (!dev->attached) { |
272850f0 | 2603 | dev_dbg(dev->class_dev, "no driver attached\n"); |
45c2bc55 IA |
2604 | retval = -ENODEV; |
2605 | goto out; | |
ed9eccbe DS |
2606 | } |
2607 | ||
20f083c0 | 2608 | s = comedi_file_read_subdevice(file); |
45c2bc55 IA |
2609 | if (!s || !s->async) { |
2610 | retval = -EIO; | |
2611 | goto out; | |
2612 | } | |
5c87fef5 | 2613 | |
ed9eccbe | 2614 | async = s->async; |
39582847 | 2615 | if (s->busy != file || (async->cmd.flags & CMDF_WRITE)) { |
f025ab9e IA |
2616 | retval = -EINVAL; |
2617 | goto out; | |
2618 | } | |
ed9eccbe DS |
2619 | |
2620 | add_wait_queue(&async->wait_head, &wait); | |
3c3bea26 | 2621 | while (count == 0 && !retval) { |
42ea907d IA |
2622 | unsigned int rp, n1, n2; |
2623 | ||
ed9eccbe DS |
2624 | set_current_state(TASK_INTERRUPTIBLE); |
2625 | ||
e9edef3a | 2626 | m = comedi_buf_read_n_available(s); |
8ea93928 | 2627 | n = min_t(size_t, m, nbytes); |
ed9eccbe DS |
2628 | |
2629 | if (n == 0) { | |
b2073dcb IA |
2630 | unsigned int runflags = |
2631 | comedi_get_subdevice_runflags(s); | |
b183a836 IA |
2632 | |
2633 | if (!comedi_is_runflags_running(runflags)) { | |
2634 | if (comedi_is_runflags_in_error(runflags)) | |
ed9eccbe | 2635 | retval = -EPIPE; |
3c3bea26 IA |
2636 | if (retval || nbytes) |
2637 | become_nonbusy = true; | |
ed9eccbe DS |
2638 | break; |
2639 | } | |
3c3bea26 IA |
2640 | if (nbytes == 0) |
2641 | break; | |
ed9eccbe DS |
2642 | if (file->f_flags & O_NONBLOCK) { |
2643 | retval = -EAGAIN; | |
2644 | break; | |
2645 | } | |
6a9ce6b6 | 2646 | schedule(); |
ed9eccbe DS |
2647 | if (signal_pending(current)) { |
2648 | retval = -ERESTARTSYS; | |
2649 | break; | |
2650 | } | |
39582847 IA |
2651 | if (s->busy != file || |
2652 | (async->cmd.flags & CMDF_WRITE)) { | |
f025ab9e IA |
2653 | retval = -EINVAL; |
2654 | break; | |
2655 | } | |
ed9eccbe DS |
2656 | continue; |
2657 | } | |
cef98864 IA |
2658 | |
2659 | set_current_state(TASK_RUNNING); | |
42ea907d IA |
2660 | rp = async->buf_read_ptr; |
2661 | n1 = min(n, async->prealloc_bufsz - rp); | |
2662 | n2 = n - n1; | |
2663 | m = copy_to_user(buf, async->prealloc_buf + rp, n1); | |
2664 | if (m) | |
2665 | m += n2; | |
2666 | else if (n2) | |
2667 | m = copy_to_user(buf + n1, async->prealloc_buf, n2); | |
ed9eccbe DS |
2668 | if (m) { |
2669 | n -= m; | |
2670 | retval = -EFAULT; | |
2671 | } | |
2672 | ||
d13be55a | 2673 | comedi_buf_read_alloc(s, n); |
f1df8662 | 2674 | comedi_buf_read_free(s, n); |
ed9eccbe DS |
2675 | |
2676 | count += n; | |
2677 | nbytes -= n; | |
2678 | ||
2679 | buf += n; | |
ed9eccbe | 2680 | } |
45c2bc55 IA |
2681 | remove_wait_queue(&async->wait_head, &wait); |
2682 | set_current_state(TASK_RUNNING); | |
970679b0 | 2683 | if (become_nonbusy && count == 0) { |
45c2bc55 IA |
2684 | struct comedi_subdevice *new_s; |
2685 | ||
2686 | /* | |
2687 | * To avoid deadlock, cannot acquire dev->mutex | |
2688 | * while dev->attach_lock is held. | |
2689 | */ | |
2690 | up_read(&dev->attach_lock); | |
2691 | attach_locked = false; | |
4b18f08b | 2692 | mutex_lock(&dev->mutex); |
45c2bc55 IA |
2693 | /* |
2694 | * Check device hasn't become detached behind our back. | |
2695 | * Checking dev->detach_count is unchanged ought to be | |
2696 | * sufficient (unless there have been 2**32 detaches in the | |
2697 | * meantime!), but check the subdevice pointer as well just in | |
2698 | * case. | |
fd060c8f IA |
2699 | * |
2700 | * Also check the subdevice is still in a suitable state to | |
2701 | * become non-busy in case it changed behind our back. | |
45c2bc55 | 2702 | */ |
20f083c0 | 2703 | new_s = comedi_file_read_subdevice(file); |
45c2bc55 | 2704 | if (dev->attached && old_detach_count == dev->detach_count && |
fd060c8f IA |
2705 | s == new_s && new_s->async == async && s->busy == file && |
2706 | !(async->cmd.flags & CMDF_WRITE) && | |
2707 | !comedi_is_subdevice_running(s) && | |
2708 | comedi_buf_read_n_available(s) == 0) | |
2709 | do_become_nonbusy(dev, s); | |
4b18f08b | 2710 | mutex_unlock(&dev->mutex); |
ed9eccbe | 2711 | } |
45c2bc55 IA |
2712 | out: |
2713 | if (attach_locked) | |
2714 | up_read(&dev->attach_lock); | |
ed9eccbe | 2715 | |
476b8477 | 2716 | return count ? count : retval; |
ed9eccbe DS |
2717 | } |
2718 | ||
ed9eccbe DS |
2719 | static int comedi_open(struct inode *inode, struct file *file) |
2720 | { | |
d4d47895 | 2721 | const unsigned int minor = iminor(inode); |
20f083c0 | 2722 | struct comedi_file *cfp; |
fc406986 IA |
2723 | struct comedi_device *dev = comedi_dev_get_from_minor(minor); |
2724 | int rc; | |
97920071 | 2725 | |
4da5fa9a | 2726 | if (!dev) { |
272850f0 | 2727 | pr_debug("invalid minor number\n"); |
ed9eccbe DS |
2728 | return -ENODEV; |
2729 | } | |
2730 | ||
20f083c0 IA |
2731 | cfp = kzalloc(sizeof(*cfp), GFP_KERNEL); |
2732 | if (!cfp) | |
2733 | return -ENOMEM; | |
2734 | ||
2735 | cfp->dev = dev; | |
2736 | ||
ed9eccbe | 2737 | mutex_lock(&dev->mutex); |
0e0d311e IA |
2738 | if (!dev->attached && !capable(CAP_SYS_ADMIN)) { |
2739 | dev_dbg(dev->class_dev, "not attached and not CAP_SYS_ADMIN\n"); | |
fc406986 IA |
2740 | rc = -ENODEV; |
2741 | goto out; | |
ed9eccbe | 2742 | } |
1363e4fb | 2743 | if (dev->attached && dev->use_count == 0) { |
ed9eccbe | 2744 | if (!try_module_get(dev->driver->module)) { |
90e6f51d | 2745 | rc = -ENXIO; |
fc406986 | 2746 | goto out; |
ed9eccbe | 2747 | } |
1363e4fb IA |
2748 | if (dev->open) { |
2749 | rc = dev->open(dev); | |
2750 | if (rc < 0) { | |
2751 | module_put(dev->driver->module); | |
2752 | goto out; | |
2753 | } | |
3c17ba07 IA |
2754 | } |
2755 | } | |
ed9eccbe DS |
2756 | |
2757 | dev->use_count++; | |
20f083c0 IA |
2758 | file->private_data = cfp; |
2759 | comedi_file_reset(file); | |
fc406986 | 2760 | rc = 0; |
ed9eccbe | 2761 | |
fc406986 | 2762 | out: |
a5011a26 | 2763 | mutex_unlock(&dev->mutex); |
20f083c0 | 2764 | if (rc) { |
fc406986 | 2765 | comedi_dev_put(dev); |
20f083c0 IA |
2766 | kfree(cfp); |
2767 | } | |
fc406986 | 2768 | return rc; |
ed9eccbe DS |
2769 | } |
2770 | ||
2aae0076 HS |
2771 | static int comedi_fasync(int fd, struct file *file, int on) |
2772 | { | |
20f083c0 IA |
2773 | struct comedi_file *cfp = file->private_data; |
2774 | struct comedi_device *dev = cfp->dev; | |
2aae0076 HS |
2775 | |
2776 | return fasync_helper(fd, file, on, &dev->async_queue); | |
2777 | } | |
2778 | ||
a5011a26 | 2779 | static int comedi_close(struct inode *inode, struct file *file) |
ed9eccbe | 2780 | { |
20f083c0 IA |
2781 | struct comedi_file *cfp = file->private_data; |
2782 | struct comedi_device *dev = cfp->dev; | |
a5011a26 | 2783 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
2784 | int i; |
2785 | ||
a5011a26 HS |
2786 | mutex_lock(&dev->mutex); |
2787 | ||
2788 | if (dev->subdevices) { | |
2789 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 2790 | s = &dev->subdevices[i]; |
a5011a26 HS |
2791 | |
2792 | if (s->busy == file) | |
2793 | do_cancel(dev, s); | |
2794 | if (s->lock == file) | |
2795 | s->lock = NULL; | |
2796 | } | |
ed9eccbe | 2797 | } |
1363e4fb IA |
2798 | if (dev->attached && dev->use_count == 1) { |
2799 | if (dev->close) | |
2800 | dev->close(dev); | |
a5011a26 | 2801 | module_put(dev->driver->module); |
1363e4fb | 2802 | } |
a5011a26 HS |
2803 | |
2804 | dev->use_count--; | |
2805 | ||
2806 | mutex_unlock(&dev->mutex); | |
fc406986 | 2807 | comedi_dev_put(dev); |
20f083c0 | 2808 | kfree(cfp); |
a5011a26 | 2809 | |
ed9eccbe DS |
2810 | return 0; |
2811 | } | |
2812 | ||
e0d0bf8a AV |
2813 | #ifdef CONFIG_COMPAT |
2814 | ||
2815 | #define COMEDI32_CHANINFO _IOR(CIO, 3, struct comedi32_chaninfo_struct) | |
2816 | #define COMEDI32_RANGEINFO _IOR(CIO, 8, struct comedi32_rangeinfo_struct) | |
2817 | /* | |
2818 | * N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR. | |
2819 | * It's too late to change it now, but it only affects the command number. | |
2820 | */ | |
2821 | #define COMEDI32_CMD _IOR(CIO, 9, struct comedi32_cmd_struct) | |
2822 | /* | |
2823 | * N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR. | |
2824 | * It's too late to change it now, but it only affects the command number. | |
2825 | */ | |
2826 | #define COMEDI32_CMDTEST _IOR(CIO, 10, struct comedi32_cmd_struct) | |
2827 | #define COMEDI32_INSNLIST _IOR(CIO, 11, struct comedi32_insnlist_struct) | |
2828 | #define COMEDI32_INSN _IOR(CIO, 12, struct comedi32_insn_struct) | |
2829 | ||
2830 | struct comedi32_chaninfo_struct { | |
2831 | unsigned int subdev; | |
2832 | compat_uptr_t maxdata_list; /* 32-bit 'unsigned int *' */ | |
2833 | compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */ | |
2834 | compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */ | |
2835 | unsigned int unused[4]; | |
2836 | }; | |
2837 | ||
2838 | struct comedi32_rangeinfo_struct { | |
2839 | unsigned int range_type; | |
2840 | compat_uptr_t range_ptr; /* 32-bit 'void *' */ | |
2841 | }; | |
2842 | ||
2843 | struct comedi32_cmd_struct { | |
2844 | unsigned int subdev; | |
2845 | unsigned int flags; | |
2846 | unsigned int start_src; | |
2847 | unsigned int start_arg; | |
2848 | unsigned int scan_begin_src; | |
2849 | unsigned int scan_begin_arg; | |
2850 | unsigned int convert_src; | |
2851 | unsigned int convert_arg; | |
2852 | unsigned int scan_end_src; | |
2853 | unsigned int scan_end_arg; | |
2854 | unsigned int stop_src; | |
2855 | unsigned int stop_arg; | |
2856 | compat_uptr_t chanlist; /* 32-bit 'unsigned int *' */ | |
2857 | unsigned int chanlist_len; | |
2858 | compat_uptr_t data; /* 32-bit 'short *' */ | |
2859 | unsigned int data_len; | |
2860 | }; | |
2861 | ||
2862 | struct comedi32_insn_struct { | |
2863 | unsigned int insn; | |
2864 | unsigned int n; | |
2865 | compat_uptr_t data; /* 32-bit 'unsigned int *' */ | |
2866 | unsigned int subdev; | |
2867 | unsigned int chanspec; | |
2868 | unsigned int unused[3]; | |
2869 | }; | |
2870 | ||
2871 | struct comedi32_insnlist_struct { | |
2872 | unsigned int n_insns; | |
2873 | compat_uptr_t insns; /* 32-bit 'struct comedi_insn *' */ | |
2874 | }; | |
2875 | ||
e0d0bf8a AV |
2876 | /* Handle 32-bit COMEDI_CHANINFO ioctl. */ |
2877 | static int compat_chaninfo(struct file *file, unsigned long arg) | |
2878 | { | |
3fbfd222 AV |
2879 | struct comedi_file *cfp = file->private_data; |
2880 | struct comedi_device *dev = cfp->dev; | |
2881 | struct comedi32_chaninfo_struct chaninfo32; | |
2882 | struct comedi_chaninfo chaninfo; | |
e0d0bf8a | 2883 | int err; |
e0d0bf8a | 2884 | |
3fbfd222 | 2885 | if (copy_from_user(&chaninfo32, compat_ptr(arg), sizeof(chaninfo32))) |
e0d0bf8a AV |
2886 | return -EFAULT; |
2887 | ||
3fbfd222 AV |
2888 | memset(&chaninfo, 0, sizeof(chaninfo)); |
2889 | chaninfo.subdev = chaninfo32.subdev; | |
2890 | chaninfo.maxdata_list = compat_ptr(chaninfo32.maxdata_list); | |
2891 | chaninfo.flaglist = compat_ptr(chaninfo32.flaglist); | |
2892 | chaninfo.rangelist = compat_ptr(chaninfo32.rangelist); | |
e0d0bf8a | 2893 | |
3fbfd222 AV |
2894 | mutex_lock(&dev->mutex); |
2895 | err = do_chaninfo_ioctl(dev, &chaninfo); | |
2896 | mutex_unlock(&dev->mutex); | |
2897 | return err; | |
e0d0bf8a AV |
2898 | } |
2899 | ||
2900 | /* Handle 32-bit COMEDI_RANGEINFO ioctl. */ | |
2901 | static int compat_rangeinfo(struct file *file, unsigned long arg) | |
2902 | { | |
2903 | struct comedi_rangeinfo __user *rangeinfo; | |
2904 | struct comedi32_rangeinfo_struct __user *rangeinfo32; | |
2905 | int err; | |
2906 | union { | |
2907 | unsigned int uint; | |
2908 | compat_uptr_t uptr; | |
2909 | } temp; | |
2910 | ||
2911 | rangeinfo32 = compat_ptr(arg); | |
2912 | rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo)); | |
2913 | ||
2914 | /* Copy rangeinfo structure. */ | |
2915 | if (!access_ok(rangeinfo32, sizeof(*rangeinfo32)) || | |
2916 | !access_ok(rangeinfo, sizeof(*rangeinfo))) | |
2917 | return -EFAULT; | |
2918 | ||
2919 | err = 0; | |
2920 | err |= __get_user(temp.uint, &rangeinfo32->range_type); | |
2921 | err |= __put_user(temp.uint, &rangeinfo->range_type); | |
2922 | err |= __get_user(temp.uptr, &rangeinfo32->range_ptr); | |
2923 | err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr); | |
2924 | if (err) | |
2925 | return -EFAULT; | |
2926 | ||
5c6a8747 | 2927 | return comedi_unlocked_ioctl(file, COMEDI_RANGEINFO, |
e0d0bf8a AV |
2928 | (unsigned long)rangeinfo); |
2929 | } | |
2930 | ||
2931 | /* Copy 32-bit cmd structure to native cmd structure. */ | |
2932 | static int get_compat_cmd(struct comedi_cmd __user *cmd, | |
2933 | struct comedi32_cmd_struct __user *cmd32) | |
2934 | { | |
2935 | int err; | |
2936 | union { | |
2937 | unsigned int uint; | |
2938 | compat_uptr_t uptr; | |
2939 | } temp; | |
2940 | ||
2941 | /* Copy cmd structure. */ | |
2942 | if (!access_ok(cmd32, sizeof(*cmd32)) || | |
2943 | !access_ok(cmd, sizeof(*cmd))) | |
2944 | return -EFAULT; | |
2945 | ||
2946 | err = 0; | |
2947 | err |= __get_user(temp.uint, &cmd32->subdev); | |
2948 | err |= __put_user(temp.uint, &cmd->subdev); | |
2949 | err |= __get_user(temp.uint, &cmd32->flags); | |
2950 | err |= __put_user(temp.uint, &cmd->flags); | |
2951 | err |= __get_user(temp.uint, &cmd32->start_src); | |
2952 | err |= __put_user(temp.uint, &cmd->start_src); | |
2953 | err |= __get_user(temp.uint, &cmd32->start_arg); | |
2954 | err |= __put_user(temp.uint, &cmd->start_arg); | |
2955 | err |= __get_user(temp.uint, &cmd32->scan_begin_src); | |
2956 | err |= __put_user(temp.uint, &cmd->scan_begin_src); | |
2957 | err |= __get_user(temp.uint, &cmd32->scan_begin_arg); | |
2958 | err |= __put_user(temp.uint, &cmd->scan_begin_arg); | |
2959 | err |= __get_user(temp.uint, &cmd32->convert_src); | |
2960 | err |= __put_user(temp.uint, &cmd->convert_src); | |
2961 | err |= __get_user(temp.uint, &cmd32->convert_arg); | |
2962 | err |= __put_user(temp.uint, &cmd->convert_arg); | |
2963 | err |= __get_user(temp.uint, &cmd32->scan_end_src); | |
2964 | err |= __put_user(temp.uint, &cmd->scan_end_src); | |
2965 | err |= __get_user(temp.uint, &cmd32->scan_end_arg); | |
2966 | err |= __put_user(temp.uint, &cmd->scan_end_arg); | |
2967 | err |= __get_user(temp.uint, &cmd32->stop_src); | |
2968 | err |= __put_user(temp.uint, &cmd->stop_src); | |
2969 | err |= __get_user(temp.uint, &cmd32->stop_arg); | |
2970 | err |= __put_user(temp.uint, &cmd->stop_arg); | |
2971 | err |= __get_user(temp.uptr, &cmd32->chanlist); | |
2972 | err |= __put_user((unsigned int __force *)compat_ptr(temp.uptr), | |
2973 | &cmd->chanlist); | |
2974 | err |= __get_user(temp.uint, &cmd32->chanlist_len); | |
2975 | err |= __put_user(temp.uint, &cmd->chanlist_len); | |
2976 | err |= __get_user(temp.uptr, &cmd32->data); | |
2977 | err |= __put_user(compat_ptr(temp.uptr), &cmd->data); | |
2978 | err |= __get_user(temp.uint, &cmd32->data_len); | |
2979 | err |= __put_user(temp.uint, &cmd->data_len); | |
2980 | return err ? -EFAULT : 0; | |
2981 | } | |
2982 | ||
2983 | /* Copy native cmd structure to 32-bit cmd structure. */ | |
2984 | static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32, | |
2985 | struct comedi_cmd __user *cmd) | |
2986 | { | |
2987 | int err; | |
2988 | unsigned int temp; | |
2989 | ||
2990 | /* | |
2991 | * Copy back most of cmd structure. | |
2992 | * | |
2993 | * Assume the pointer values are already valid. | |
2994 | * (Could use ptr_to_compat() to set them.) | |
2995 | */ | |
2996 | if (!access_ok(cmd, sizeof(*cmd)) || | |
2997 | !access_ok(cmd32, sizeof(*cmd32))) | |
2998 | return -EFAULT; | |
2999 | ||
3000 | err = 0; | |
3001 | err |= __get_user(temp, &cmd->subdev); | |
3002 | err |= __put_user(temp, &cmd32->subdev); | |
3003 | err |= __get_user(temp, &cmd->flags); | |
3004 | err |= __put_user(temp, &cmd32->flags); | |
3005 | err |= __get_user(temp, &cmd->start_src); | |
3006 | err |= __put_user(temp, &cmd32->start_src); | |
3007 | err |= __get_user(temp, &cmd->start_arg); | |
3008 | err |= __put_user(temp, &cmd32->start_arg); | |
3009 | err |= __get_user(temp, &cmd->scan_begin_src); | |
3010 | err |= __put_user(temp, &cmd32->scan_begin_src); | |
3011 | err |= __get_user(temp, &cmd->scan_begin_arg); | |
3012 | err |= __put_user(temp, &cmd32->scan_begin_arg); | |
3013 | err |= __get_user(temp, &cmd->convert_src); | |
3014 | err |= __put_user(temp, &cmd32->convert_src); | |
3015 | err |= __get_user(temp, &cmd->convert_arg); | |
3016 | err |= __put_user(temp, &cmd32->convert_arg); | |
3017 | err |= __get_user(temp, &cmd->scan_end_src); | |
3018 | err |= __put_user(temp, &cmd32->scan_end_src); | |
3019 | err |= __get_user(temp, &cmd->scan_end_arg); | |
3020 | err |= __put_user(temp, &cmd32->scan_end_arg); | |
3021 | err |= __get_user(temp, &cmd->stop_src); | |
3022 | err |= __put_user(temp, &cmd32->stop_src); | |
3023 | err |= __get_user(temp, &cmd->stop_arg); | |
3024 | err |= __put_user(temp, &cmd32->stop_arg); | |
3025 | /* Assume chanlist pointer is unchanged. */ | |
3026 | err |= __get_user(temp, &cmd->chanlist_len); | |
3027 | err |= __put_user(temp, &cmd32->chanlist_len); | |
3028 | /* Assume data pointer is unchanged. */ | |
3029 | err |= __get_user(temp, &cmd->data_len); | |
3030 | err |= __put_user(temp, &cmd32->data_len); | |
3031 | return err ? -EFAULT : 0; | |
3032 | } | |
3033 | ||
3034 | /* Handle 32-bit COMEDI_CMD ioctl. */ | |
3035 | static int compat_cmd(struct file *file, unsigned long arg) | |
3036 | { | |
3037 | struct comedi_cmd __user *cmd; | |
3038 | struct comedi32_cmd_struct __user *cmd32; | |
3039 | int rc, err; | |
3040 | ||
3041 | cmd32 = compat_ptr(arg); | |
3042 | cmd = compat_alloc_user_space(sizeof(*cmd)); | |
3043 | ||
3044 | rc = get_compat_cmd(cmd, cmd32); | |
3045 | if (rc) | |
3046 | return rc; | |
3047 | ||
5c6a8747 | 3048 | rc = comedi_unlocked_ioctl(file, COMEDI_CMD, (unsigned long)cmd); |
e0d0bf8a AV |
3049 | if (rc == -EAGAIN) { |
3050 | /* Special case: copy cmd back to user. */ | |
3051 | err = put_compat_cmd(cmd32, cmd); | |
3052 | if (err) | |
3053 | rc = err; | |
3054 | } | |
3055 | ||
3056 | return rc; | |
3057 | } | |
3058 | ||
3059 | /* Handle 32-bit COMEDI_CMDTEST ioctl. */ | |
3060 | static int compat_cmdtest(struct file *file, unsigned long arg) | |
3061 | { | |
3062 | struct comedi_cmd __user *cmd; | |
3063 | struct comedi32_cmd_struct __user *cmd32; | |
3064 | int rc, err; | |
3065 | ||
3066 | cmd32 = compat_ptr(arg); | |
3067 | cmd = compat_alloc_user_space(sizeof(*cmd)); | |
3068 | ||
3069 | rc = get_compat_cmd(cmd, cmd32); | |
3070 | if (rc) | |
3071 | return rc; | |
3072 | ||
5c6a8747 | 3073 | rc = comedi_unlocked_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd); |
e0d0bf8a AV |
3074 | if (rc < 0) |
3075 | return rc; | |
3076 | ||
3077 | err = put_compat_cmd(cmd32, cmd); | |
3078 | if (err) | |
3079 | rc = err; | |
3080 | ||
3081 | return rc; | |
3082 | } | |
3083 | ||
3084 | /* Copy 32-bit insn structure to native insn structure. */ | |
3085 | static int get_compat_insn(struct comedi_insn __user *insn, | |
3086 | struct comedi32_insn_struct __user *insn32) | |
3087 | { | |
3088 | int err; | |
3089 | union { | |
3090 | unsigned int uint; | |
3091 | compat_uptr_t uptr; | |
3092 | } temp; | |
3093 | ||
3094 | /* Copy insn structure. Ignore the unused members. */ | |
3095 | err = 0; | |
3096 | if (!access_ok(insn32, sizeof(*insn32)) || | |
3097 | !access_ok(insn, sizeof(*insn))) | |
3098 | return -EFAULT; | |
3099 | ||
3100 | err |= __get_user(temp.uint, &insn32->insn); | |
3101 | err |= __put_user(temp.uint, &insn->insn); | |
3102 | err |= __get_user(temp.uint, &insn32->n); | |
3103 | err |= __put_user(temp.uint, &insn->n); | |
3104 | err |= __get_user(temp.uptr, &insn32->data); | |
3105 | err |= __put_user(compat_ptr(temp.uptr), &insn->data); | |
3106 | err |= __get_user(temp.uint, &insn32->subdev); | |
3107 | err |= __put_user(temp.uint, &insn->subdev); | |
3108 | err |= __get_user(temp.uint, &insn32->chanspec); | |
3109 | err |= __put_user(temp.uint, &insn->chanspec); | |
3110 | return err ? -EFAULT : 0; | |
3111 | } | |
3112 | ||
3113 | /* Handle 32-bit COMEDI_INSNLIST ioctl. */ | |
3114 | static int compat_insnlist(struct file *file, unsigned long arg) | |
3115 | { | |
3116 | struct combined_insnlist { | |
3117 | struct comedi_insnlist insnlist; | |
3118 | struct comedi_insn insn[1]; | |
3119 | } __user *s; | |
3120 | struct comedi32_insnlist_struct __user *insnlist32; | |
3121 | struct comedi32_insn_struct __user *insn32; | |
3122 | compat_uptr_t uptr; | |
3123 | unsigned int n_insns, n; | |
3124 | int err, rc; | |
3125 | ||
3126 | insnlist32 = compat_ptr(arg); | |
3127 | ||
3128 | /* Get 32-bit insnlist structure. */ | |
3129 | if (!access_ok(insnlist32, sizeof(*insnlist32))) | |
3130 | return -EFAULT; | |
3131 | ||
3132 | err = 0; | |
3133 | err |= __get_user(n_insns, &insnlist32->n_insns); | |
3134 | err |= __get_user(uptr, &insnlist32->insns); | |
3135 | insn32 = compat_ptr(uptr); | |
3136 | if (err) | |
3137 | return -EFAULT; | |
3138 | ||
3139 | /* Allocate user memory to copy insnlist and insns into. */ | |
3140 | s = compat_alloc_user_space(offsetof(struct combined_insnlist, | |
3141 | insn[n_insns])); | |
3142 | ||
3143 | /* Set native insnlist structure. */ | |
3144 | if (!access_ok(&s->insnlist, sizeof(s->insnlist))) | |
3145 | return -EFAULT; | |
3146 | ||
3147 | err |= __put_user(n_insns, &s->insnlist.n_insns); | |
3148 | err |= __put_user(&s->insn[0], &s->insnlist.insns); | |
3149 | if (err) | |
3150 | return -EFAULT; | |
3151 | ||
3152 | /* Copy insn structures. */ | |
3153 | for (n = 0; n < n_insns; n++) { | |
3154 | rc = get_compat_insn(&s->insn[n], &insn32[n]); | |
3155 | if (rc) | |
3156 | return rc; | |
3157 | } | |
3158 | ||
5c6a8747 | 3159 | return comedi_unlocked_ioctl(file, COMEDI_INSNLIST, |
e0d0bf8a AV |
3160 | (unsigned long)&s->insnlist); |
3161 | } | |
3162 | ||
3163 | /* Handle 32-bit COMEDI_INSN ioctl. */ | |
3164 | static int compat_insn(struct file *file, unsigned long arg) | |
3165 | { | |
3166 | struct comedi_insn __user *insn; | |
3167 | struct comedi32_insn_struct __user *insn32; | |
3168 | int rc; | |
3169 | ||
3170 | insn32 = compat_ptr(arg); | |
3171 | insn = compat_alloc_user_space(sizeof(*insn)); | |
3172 | ||
3173 | rc = get_compat_insn(insn, insn32); | |
3174 | if (rc) | |
3175 | return rc; | |
3176 | ||
5c6a8747 | 3177 | return comedi_unlocked_ioctl(file, COMEDI_INSN, (unsigned long)insn); |
e0d0bf8a AV |
3178 | } |
3179 | ||
3180 | /* | |
3181 | * compat_ioctl file operation. | |
3182 | * | |
3183 | * Returns -ENOIOCTLCMD for unrecognised ioctl codes. | |
3184 | */ | |
3185 | static long comedi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
3186 | { | |
3187 | int rc; | |
3188 | ||
3189 | switch (cmd) { | |
3190 | case COMEDI_DEVCONFIG: | |
3191 | case COMEDI_DEVINFO: | |
3192 | case COMEDI_SUBDINFO: | |
3193 | case COMEDI_BUFCONFIG: | |
3194 | case COMEDI_BUFINFO: | |
3195 | /* Just need to translate the pointer argument. */ | |
3196 | arg = (unsigned long)compat_ptr(arg); | |
5c6a8747 | 3197 | rc = comedi_unlocked_ioctl(file, cmd, arg); |
e0d0bf8a AV |
3198 | break; |
3199 | case COMEDI_LOCK: | |
3200 | case COMEDI_UNLOCK: | |
3201 | case COMEDI_CANCEL: | |
3202 | case COMEDI_POLL: | |
3203 | case COMEDI_SETRSUBD: | |
3204 | case COMEDI_SETWSUBD: | |
3205 | /* No translation needed. */ | |
5c6a8747 | 3206 | rc = comedi_unlocked_ioctl(file, cmd, arg); |
e0d0bf8a AV |
3207 | break; |
3208 | case COMEDI32_CHANINFO: | |
3209 | rc = compat_chaninfo(file, arg); | |
3210 | break; | |
3211 | case COMEDI32_RANGEINFO: | |
3212 | rc = compat_rangeinfo(file, arg); | |
3213 | break; | |
3214 | case COMEDI32_CMD: | |
3215 | rc = compat_cmd(file, arg); | |
3216 | break; | |
3217 | case COMEDI32_CMDTEST: | |
3218 | rc = compat_cmdtest(file, arg); | |
3219 | break; | |
3220 | case COMEDI32_INSNLIST: | |
3221 | rc = compat_insnlist(file, arg); | |
3222 | break; | |
3223 | case COMEDI32_INSN: | |
3224 | rc = compat_insn(file, arg); | |
3225 | break; | |
3226 | default: | |
3227 | rc = -ENOIOCTLCMD; | |
3228 | break; | |
3229 | } | |
3230 | return rc; | |
3231 | } | |
3232 | #else | |
3233 | #define comedi_compat_ioctl NULL | |
3234 | #endif | |
3235 | ||
8cb8aad7 | 3236 | static const struct file_operations comedi_fops = { |
a5011a26 HS |
3237 | .owner = THIS_MODULE, |
3238 | .unlocked_ioctl = comedi_unlocked_ioctl, | |
3239 | .compat_ioctl = comedi_compat_ioctl, | |
3240 | .open = comedi_open, | |
3241 | .release = comedi_close, | |
3242 | .read = comedi_read, | |
3243 | .write = comedi_write, | |
3244 | .mmap = comedi_mmap, | |
3245 | .poll = comedi_poll, | |
3246 | .fasync = comedi_fasync, | |
3247 | .llseek = noop_llseek, | |
3248 | }; | |
3249 | ||
dd630cde | 3250 | /** |
a3e39942 IA |
3251 | * comedi_event() - Handle events for asynchronous COMEDI command |
3252 | * @dev: COMEDI device. | |
3253 | * @s: COMEDI subdevice. | |
3254 | * Context: in_interrupt() (usually), @s->spin_lock spin-lock not held. | |
dd630cde | 3255 | * |
a3e39942 IA |
3256 | * If an asynchronous COMEDI command is active on the subdevice, process |
3257 | * any %COMEDI_CB_... event flags that have been set, usually by an | |
dd630cde | 3258 | * interrupt handler. These may change the run state of the asynchronous |
a3e39942 | 3259 | * command, wake a task, and/or send a %SIGIO signal. |
dd630cde | 3260 | */ |
a5011a26 | 3261 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
883db3d9 | 3262 | { |
a5011a26 | 3263 | struct comedi_async *async = s->async; |
ef4b4b27 IA |
3264 | unsigned int events; |
3265 | int si_code = 0; | |
3266 | unsigned long flags; | |
3267 | ||
3268 | spin_lock_irqsave(&s->spin_lock, flags); | |
883db3d9 | 3269 | |
ef4b4b27 | 3270 | events = async->events; |
922d9ced | 3271 | async->events = 0; |
ef4b4b27 IA |
3272 | if (!__comedi_is_subdevice_running(s)) { |
3273 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
a5011a26 | 3274 | return; |
ef4b4b27 | 3275 | } |
a5011a26 | 3276 | |
922d9ced | 3277 | if (events & COMEDI_CB_CANCEL_MASK) |
ef4b4b27 | 3278 | __comedi_clear_subdevice_runflags(s, COMEDI_SRF_RUNNING); |
781f933c HS |
3279 | |
3280 | /* | |
ef4b4b27 IA |
3281 | * Remember if an error event has occurred, so an error can be |
3282 | * returned the next time the user does a read() or write(). | |
781f933c | 3283 | */ |
ef4b4b27 IA |
3284 | if (events & COMEDI_CB_ERROR_MASK) |
3285 | __comedi_set_subdevice_runflags(s, COMEDI_SRF_ERROR); | |
883db3d9 | 3286 | |
922d9ced | 3287 | if (async->cb_mask & events) { |
c265be01 | 3288 | wake_up_interruptible(&async->wait_head); |
aa33122f | 3289 | si_code = async->cmd.flags & CMDF_WRITE ? POLL_OUT : POLL_IN; |
a5011a26 | 3290 | } |
ef4b4b27 IA |
3291 | |
3292 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
3293 | ||
3294 | if (si_code) | |
3295 | kill_fasync(&dev->async_queue, SIGIO, si_code); | |
883db3d9 | 3296 | } |
5660e742 | 3297 | EXPORT_SYMBOL_GPL(comedi_event); |
883db3d9 | 3298 | |
07778393 | 3299 | /* Note: the ->mutex is pre-locked on successful return */ |
7638ffcb | 3300 | struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) |
a5011a26 | 3301 | { |
7638ffcb | 3302 | struct comedi_device *dev; |
a5011a26 | 3303 | struct device *csdev; |
d4d47895 | 3304 | unsigned int i; |
a5011a26 | 3305 | |
36efbacd | 3306 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
88cc30cf | 3307 | if (!dev) |
7638ffcb | 3308 | return ERR_PTR(-ENOMEM); |
7638ffcb | 3309 | comedi_device_init(dev); |
db2e3487 | 3310 | comedi_set_hw_dev(dev, hardware_device); |
07778393 | 3311 | mutex_lock(&dev->mutex); |
5b7dba1b | 3312 | mutex_lock(&comedi_board_minor_table_lock); |
38b9722a IA |
3313 | for (i = hardware_device ? comedi_num_legacy_minors : 0; |
3314 | i < COMEDI_NUM_BOARD_MINORS; ++i) { | |
88cc30cf | 3315 | if (!comedi_board_minor_table[i]) { |
cb6b79de | 3316 | comedi_board_minor_table[i] = dev; |
a5011a26 HS |
3317 | break; |
3318 | } | |
3319 | } | |
5b7dba1b | 3320 | mutex_unlock(&comedi_board_minor_table_lock); |
a5011a26 | 3321 | if (i == COMEDI_NUM_BOARD_MINORS) { |
07778393 | 3322 | mutex_unlock(&dev->mutex); |
7638ffcb | 3323 | comedi_device_cleanup(dev); |
5b13ed94 | 3324 | comedi_dev_put(dev); |
a112eab4 HM |
3325 | dev_err(hardware_device, |
3326 | "ran out of minor numbers for board device files\n"); | |
7638ffcb | 3327 | return ERR_PTR(-EBUSY); |
a5011a26 | 3328 | } |
7638ffcb | 3329 | dev->minor = i; |
a5011a26 HS |
3330 | csdev = device_create(comedi_class, hardware_device, |
3331 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); | |
3332 | if (!IS_ERR(csdev)) | |
8f988d87 | 3333 | dev->class_dev = get_device(csdev); |
883db3d9 | 3334 | |
07778393 | 3335 | /* Note: dev->mutex needs to be unlocked by the caller. */ |
7638ffcb | 3336 | return dev; |
883db3d9 FMH |
3337 | } |
3338 | ||
3346b798 | 3339 | void comedi_release_hardware_device(struct device *hardware_device) |
883db3d9 | 3340 | { |
a5011a26 | 3341 | int minor; |
cb6b79de | 3342 | struct comedi_device *dev; |
883db3d9 | 3343 | |
38b9722a IA |
3344 | for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; |
3345 | minor++) { | |
5b7dba1b | 3346 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de IA |
3347 | dev = comedi_board_minor_table[minor]; |
3348 | if (dev && dev->hw_dev == hardware_device) { | |
5b7dba1b IA |
3349 | comedi_board_minor_table[minor] = NULL; |
3350 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 3351 | comedi_free_board_dev(dev); |
3346b798 | 3352 | break; |
a5011a26 | 3353 | } |
5b7dba1b | 3354 | mutex_unlock(&comedi_board_minor_table_lock); |
883db3d9 | 3355 | } |
883db3d9 FMH |
3356 | } |
3357 | ||
f65cc544 | 3358 | int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 3359 | { |
f65cc544 | 3360 | struct comedi_device *dev = s->device; |
a5011a26 | 3361 | struct device *csdev; |
d4d47895 | 3362 | unsigned int i; |
883db3d9 | 3363 | |
5b7dba1b IA |
3364 | mutex_lock(&comedi_subdevice_minor_table_lock); |
3365 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { | |
88cc30cf | 3366 | if (!comedi_subdevice_minor_table[i]) { |
bd5b4173 | 3367 | comedi_subdevice_minor_table[i] = s; |
a5011a26 HS |
3368 | break; |
3369 | } | |
3370 | } | |
5b7dba1b IA |
3371 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
3372 | if (i == COMEDI_NUM_SUBDEVICE_MINORS) { | |
a112eab4 HM |
3373 | dev_err(dev->class_dev, |
3374 | "ran out of minor numbers for subdevice files\n"); | |
a5011a26 HS |
3375 | return -EBUSY; |
3376 | } | |
5b7dba1b | 3377 | i += COMEDI_NUM_BOARD_MINORS; |
a5011a26 HS |
3378 | s->minor = i; |
3379 | csdev = device_create(comedi_class, dev->class_dev, | |
3380 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", | |
90a35c15 | 3381 | dev->minor, s->index); |
a5011a26 HS |
3382 | if (!IS_ERR(csdev)) |
3383 | s->class_dev = csdev; | |
883db3d9 | 3384 | |
da718546 | 3385 | return 0; |
883db3d9 FMH |
3386 | } |
3387 | ||
a5011a26 | 3388 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 3389 | { |
0fcc9d48 | 3390 | unsigned int i; |
883db3d9 | 3391 | |
88cc30cf | 3392 | if (!s) |
a5011a26 | 3393 | return; |
5104a898 HS |
3394 | if (s->minor < COMEDI_NUM_BOARD_MINORS || |
3395 | s->minor >= COMEDI_NUM_MINORS) | |
a5011a26 | 3396 | return; |
883db3d9 | 3397 | |
0fcc9d48 IA |
3398 | i = s->minor - COMEDI_NUM_BOARD_MINORS; |
3399 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 IA |
3400 | if (s == comedi_subdevice_minor_table[i]) |
3401 | comedi_subdevice_minor_table[i] = NULL; | |
0fcc9d48 | 3402 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
a5011a26 HS |
3403 | if (s->class_dev) { |
3404 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); | |
3405 | s->class_dev = NULL; | |
883db3d9 | 3406 | } |
883db3d9 | 3407 | } |
a5787824 | 3408 | |
682b9119 | 3409 | static void comedi_cleanup_board_minors(void) |
76cca89f | 3410 | { |
2be8ae58 | 3411 | struct comedi_device *dev; |
d4d47895 | 3412 | unsigned int i; |
76cca89f | 3413 | |
2be8ae58 HS |
3414 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { |
3415 | dev = comedi_clear_board_minor(i); | |
3416 | comedi_free_board_dev(dev); | |
3417 | } | |
76cca89f HS |
3418 | } |
3419 | ||
91fa0b0c HS |
3420 | static int __init comedi_init(void) |
3421 | { | |
3422 | int i; | |
3423 | int retval; | |
3424 | ||
c2ad078b | 3425 | pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n"); |
91fa0b0c | 3426 | |
d1d78d20 | 3427 | if (comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { |
c2ad078b | 3428 | pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", |
91fa0b0c HS |
3429 | COMEDI_NUM_BOARD_MINORS); |
3430 | return -EINVAL; | |
3431 | } | |
3432 | ||
91fa0b0c HS |
3433 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
3434 | COMEDI_NUM_MINORS, "comedi"); | |
3435 | if (retval) | |
125178d1 IA |
3436 | return retval; |
3437 | ||
91fa0b0c HS |
3438 | cdev_init(&comedi_cdev, &comedi_fops); |
3439 | comedi_cdev.owner = THIS_MODULE; | |
a5bde3a1 AP |
3440 | |
3441 | retval = kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
125178d1 IA |
3442 | if (retval) |
3443 | goto out_unregister_chrdev_region; | |
3444 | ||
3445 | retval = cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), | |
3446 | COMEDI_NUM_MINORS); | |
3447 | if (retval) | |
3448 | goto out_unregister_chrdev_region; | |
a5bde3a1 | 3449 | |
91fa0b0c HS |
3450 | comedi_class = class_create(THIS_MODULE, "comedi"); |
3451 | if (IS_ERR(comedi_class)) { | |
125178d1 | 3452 | retval = PTR_ERR(comedi_class); |
c2ad078b | 3453 | pr_err("failed to create class\n"); |
125178d1 | 3454 | goto out_cdev_del; |
91fa0b0c HS |
3455 | } |
3456 | ||
e56341ad | 3457 | comedi_class->dev_groups = comedi_dev_groups; |
91fa0b0c | 3458 | |
91fa0b0c HS |
3459 | /* create devices files for legacy/manual use */ |
3460 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
7638ffcb | 3461 | struct comedi_device *dev; |
4bac39f6 | 3462 | |
7638ffcb IA |
3463 | dev = comedi_alloc_board_minor(NULL); |
3464 | if (IS_ERR(dev)) { | |
125178d1 IA |
3465 | retval = PTR_ERR(dev); |
3466 | goto out_cleanup_board_minors; | |
91fa0b0c | 3467 | } |
cb3aadae | 3468 | /* comedi_alloc_board_minor() locked the mutex */ |
77c21b62 | 3469 | lockdep_assert_held(&dev->mutex); |
cb3aadae | 3470 | mutex_unlock(&dev->mutex); |
91fa0b0c HS |
3471 | } |
3472 | ||
bf279ece CKC |
3473 | /* XXX requires /proc interface */ |
3474 | comedi_proc_init(); | |
3475 | ||
91fa0b0c | 3476 | return 0; |
125178d1 IA |
3477 | |
3478 | out_cleanup_board_minors: | |
3479 | comedi_cleanup_board_minors(); | |
3480 | class_destroy(comedi_class); | |
3481 | out_cdev_del: | |
3482 | cdev_del(&comedi_cdev); | |
3483 | out_unregister_chrdev_region: | |
3484 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
3485 | return retval; | |
91fa0b0c HS |
3486 | } |
3487 | module_init(comedi_init); | |
3488 | ||
3489 | static void __exit comedi_cleanup(void) | |
3490 | { | |
682b9119 | 3491 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
3492 | class_destroy(comedi_class); |
3493 | cdev_del(&comedi_cdev); | |
3494 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
3495 | ||
3496 | comedi_proc_cleanup(); | |
3497 | } | |
3498 | module_exit(comedi_cleanup); | |
3499 | ||
a5787824 HS |
3500 | MODULE_AUTHOR("http://www.comedi.org"); |
3501 | MODULE_DESCRIPTION("Comedi core module"); | |
3502 | MODULE_LICENSE("GPL"); |