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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
d052d1be | 13 | #include <linux/platform_device.h> |
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/bootmem.h> | |
18 | #include <linux/err.h> | |
4e57b681 | 19 | #include <linux/slab.h> |
1da177e4 | 20 | |
a1bdc7aa BD |
21 | #include "base.h" |
22 | ||
4a3ad20c GKH |
23 | #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ |
24 | driver)) | |
00d3dcdd | 25 | |
1da177e4 | 26 | struct device platform_bus = { |
1e0b2cf9 | 27 | .init_name = "platform", |
1da177e4 | 28 | }; |
a96b2042 | 29 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 LT |
30 | |
31 | /** | |
4a3ad20c GKH |
32 | * platform_get_resource - get a resource for a device |
33 | * @dev: platform device | |
34 | * @type: resource type | |
35 | * @num: resource index | |
1da177e4 | 36 | */ |
4a3ad20c GKH |
37 | struct resource *platform_get_resource(struct platform_device *dev, |
38 | unsigned int type, unsigned int num) | |
1da177e4 LT |
39 | { |
40 | int i; | |
41 | ||
42 | for (i = 0; i < dev->num_resources; i++) { | |
43 | struct resource *r = &dev->resource[i]; | |
44 | ||
c9f66169 MD |
45 | if (type == resource_type(r) && num-- == 0) |
46 | return r; | |
1da177e4 LT |
47 | } |
48 | return NULL; | |
49 | } | |
a96b2042 | 50 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
51 | |
52 | /** | |
4a3ad20c GKH |
53 | * platform_get_irq - get an IRQ for a device |
54 | * @dev: platform device | |
55 | * @num: IRQ number index | |
1da177e4 LT |
56 | */ |
57 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
58 | { | |
59 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
60 | ||
305b3228 | 61 | return r ? r->start : -ENXIO; |
1da177e4 | 62 | } |
a96b2042 | 63 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
64 | |
65 | /** | |
4a3ad20c GKH |
66 | * platform_get_resource_byname - get a resource for a device by name |
67 | * @dev: platform device | |
68 | * @type: resource type | |
69 | * @name: resource name | |
1da177e4 | 70 | */ |
4a3ad20c GKH |
71 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
72 | unsigned int type, char *name) | |
1da177e4 LT |
73 | { |
74 | int i; | |
75 | ||
76 | for (i = 0; i < dev->num_resources; i++) { | |
77 | struct resource *r = &dev->resource[i]; | |
78 | ||
c9f66169 MD |
79 | if (type == resource_type(r) && !strcmp(r->name, name)) |
80 | return r; | |
1da177e4 LT |
81 | } |
82 | return NULL; | |
83 | } | |
a96b2042 | 84 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
85 | |
86 | /** | |
4a3ad20c GKH |
87 | * platform_get_irq - get an IRQ for a device |
88 | * @dev: platform device | |
89 | * @name: IRQ name | |
1da177e4 LT |
90 | */ |
91 | int platform_get_irq_byname(struct platform_device *dev, char *name) | |
92 | { | |
4a3ad20c GKH |
93 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, |
94 | name); | |
1da177e4 | 95 | |
305b3228 | 96 | return r ? r->start : -ENXIO; |
1da177e4 | 97 | } |
a96b2042 | 98 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
99 | |
100 | /** | |
4a3ad20c GKH |
101 | * platform_add_devices - add a numbers of platform devices |
102 | * @devs: array of platform devices to add | |
103 | * @num: number of platform devices in array | |
1da177e4 LT |
104 | */ |
105 | int platform_add_devices(struct platform_device **devs, int num) | |
106 | { | |
107 | int i, ret = 0; | |
108 | ||
109 | for (i = 0; i < num; i++) { | |
110 | ret = platform_device_register(devs[i]); | |
111 | if (ret) { | |
112 | while (--i >= 0) | |
113 | platform_device_unregister(devs[i]); | |
114 | break; | |
115 | } | |
116 | } | |
117 | ||
118 | return ret; | |
119 | } | |
a96b2042 | 120 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 121 | |
37c12e74 RK |
122 | struct platform_object { |
123 | struct platform_device pdev; | |
124 | char name[1]; | |
125 | }; | |
126 | ||
1da177e4 | 127 | /** |
4a3ad20c GKH |
128 | * platform_device_put |
129 | * @pdev: platform device to free | |
37c12e74 | 130 | * |
4a3ad20c GKH |
131 | * Free all memory associated with a platform device. This function must |
132 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
133 | */ |
134 | void platform_device_put(struct platform_device *pdev) | |
135 | { | |
136 | if (pdev) | |
137 | put_device(&pdev->dev); | |
138 | } | |
139 | EXPORT_SYMBOL_GPL(platform_device_put); | |
140 | ||
141 | static void platform_device_release(struct device *dev) | |
142 | { | |
4a3ad20c GKH |
143 | struct platform_object *pa = container_of(dev, struct platform_object, |
144 | pdev.dev); | |
37c12e74 RK |
145 | |
146 | kfree(pa->pdev.dev.platform_data); | |
147 | kfree(pa->pdev.resource); | |
148 | kfree(pa); | |
149 | } | |
150 | ||
151 | /** | |
4a3ad20c GKH |
152 | * platform_device_alloc |
153 | * @name: base name of the device we're adding | |
154 | * @id: instance id | |
37c12e74 | 155 | * |
4a3ad20c GKH |
156 | * Create a platform device object which can have other objects attached |
157 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 158 | */ |
1359555e | 159 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
160 | { |
161 | struct platform_object *pa; | |
162 | ||
163 | pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); | |
164 | if (pa) { | |
165 | strcpy(pa->name, name); | |
166 | pa->pdev.name = pa->name; | |
167 | pa->pdev.id = id; | |
168 | device_initialize(&pa->pdev.dev); | |
169 | pa->pdev.dev.release = platform_device_release; | |
170 | } | |
171 | ||
93ce3061 | 172 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
173 | } |
174 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
175 | ||
176 | /** | |
4a3ad20c GKH |
177 | * platform_device_add_resources |
178 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
179 | * @res: set of resources that needs to be allocated for the device | |
180 | * @num: number of resources | |
37c12e74 | 181 | * |
4a3ad20c GKH |
182 | * Add a copy of the resources to the platform device. The memory |
183 | * associated with the resources will be freed when the platform device is | |
184 | * released. | |
37c12e74 | 185 | */ |
4a3ad20c GKH |
186 | int platform_device_add_resources(struct platform_device *pdev, |
187 | struct resource *res, unsigned int num) | |
37c12e74 RK |
188 | { |
189 | struct resource *r; | |
190 | ||
191 | r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL); | |
192 | if (r) { | |
193 | memcpy(r, res, sizeof(struct resource) * num); | |
194 | pdev->resource = r; | |
195 | pdev->num_resources = num; | |
196 | } | |
197 | return r ? 0 : -ENOMEM; | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
200 | ||
201 | /** | |
4a3ad20c GKH |
202 | * platform_device_add_data |
203 | * @pdev: platform device allocated by platform_device_alloc to add resources to | |
204 | * @data: platform specific data for this platform device | |
205 | * @size: size of platform specific data | |
37c12e74 | 206 | * |
4a3ad20c GKH |
207 | * Add a copy of platform specific data to the platform device's |
208 | * platform_data pointer. The memory associated with the platform data | |
209 | * will be freed when the platform device is released. | |
37c12e74 | 210 | */ |
4a3ad20c GKH |
211 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
212 | size_t size) | |
37c12e74 RK |
213 | { |
214 | void *d; | |
215 | ||
216 | d = kmalloc(size, GFP_KERNEL); | |
217 | if (d) { | |
218 | memcpy(d, data, size); | |
219 | pdev->dev.platform_data = d; | |
006f4571 | 220 | pdev->platform_data = d; |
37c12e74 RK |
221 | } |
222 | return d ? 0 : -ENOMEM; | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
225 | ||
226 | /** | |
4a3ad20c GKH |
227 | * platform_device_add - add a platform device to device hierarchy |
228 | * @pdev: platform device we're adding | |
1da177e4 | 229 | * |
4a3ad20c GKH |
230 | * This is part 2 of platform_device_register(), though may be called |
231 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 232 | */ |
37c12e74 | 233 | int platform_device_add(struct platform_device *pdev) |
1da177e4 LT |
234 | { |
235 | int i, ret = 0; | |
236 | ||
237 | if (!pdev) | |
238 | return -EINVAL; | |
239 | ||
240 | if (!pdev->dev.parent) | |
241 | pdev->dev.parent = &platform_bus; | |
242 | ||
243 | pdev->dev.bus = &platform_bus_type; | |
244 | ||
245 | if (pdev->id != -1) | |
1e0b2cf9 | 246 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
1da177e4 | 247 | else |
1e0b2cf9 | 248 | dev_set_name(&pdev->dev, pdev->name); |
1da177e4 | 249 | |
ce21c7bc ML |
250 | /* We will remove platform_data field from struct device |
251 | * if all platform devices pass its platform specific data | |
252 | * from platform_device. The conversion is going to be a | |
253 | * long time, so we allow the two cases coexist to make | |
254 | * this kind of fix more easily*/ | |
255 | if (pdev->platform_data && pdev->dev.platform_data) { | |
256 | printk(KERN_ERR | |
257 | "%s: use which platform_data?\n", | |
258 | dev_name(&pdev->dev)); | |
259 | } else if (pdev->platform_data) { | |
260 | pdev->dev.platform_data = pdev->platform_data; | |
261 | } else if (pdev->dev.platform_data) { | |
262 | pdev->platform_data = pdev->dev.platform_data; | |
263 | } | |
006f4571 | 264 | |
1da177e4 LT |
265 | for (i = 0; i < pdev->num_resources; i++) { |
266 | struct resource *p, *r = &pdev->resource[i]; | |
267 | ||
268 | if (r->name == NULL) | |
1e0b2cf9 | 269 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
270 | |
271 | p = r->parent; | |
272 | if (!p) { | |
c9f66169 | 273 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 274 | p = &iomem_resource; |
c9f66169 | 275 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
276 | p = &ioport_resource; |
277 | } | |
278 | ||
d960bb4d | 279 | if (p && insert_resource(p, r)) { |
1da177e4 LT |
280 | printk(KERN_ERR |
281 | "%s: failed to claim resource %d\n", | |
1e0b2cf9 | 282 | dev_name(&pdev->dev), i); |
1da177e4 LT |
283 | ret = -EBUSY; |
284 | goto failed; | |
285 | } | |
286 | } | |
287 | ||
288 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 289 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 290 | |
e3915532 | 291 | ret = device_add(&pdev->dev); |
1da177e4 LT |
292 | if (ret == 0) |
293 | return ret; | |
294 | ||
295 | failed: | |
c9f66169 MD |
296 | while (--i >= 0) { |
297 | struct resource *r = &pdev->resource[i]; | |
298 | unsigned long type = resource_type(r); | |
299 | ||
300 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
301 | release_resource(r); | |
302 | } | |
303 | ||
1da177e4 LT |
304 | return ret; |
305 | } | |
37c12e74 RK |
306 | EXPORT_SYMBOL_GPL(platform_device_add); |
307 | ||
308 | /** | |
4a3ad20c GKH |
309 | * platform_device_del - remove a platform-level device |
310 | * @pdev: platform device we're removing | |
1da177e4 | 311 | * |
4a3ad20c GKH |
312 | * Note that this function will also release all memory- and port-based |
313 | * resources owned by the device (@dev->resource). This function must | |
314 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 315 | */ |
93ce3061 | 316 | void platform_device_del(struct platform_device *pdev) |
1da177e4 LT |
317 | { |
318 | int i; | |
319 | ||
320 | if (pdev) { | |
dc4c15d4 JD |
321 | device_del(&pdev->dev); |
322 | ||
1da177e4 LT |
323 | for (i = 0; i < pdev->num_resources; i++) { |
324 | struct resource *r = &pdev->resource[i]; | |
c9f66169 MD |
325 | unsigned long type = resource_type(r); |
326 | ||
327 | if (type == IORESOURCE_MEM || type == IORESOURCE_IO) | |
1da177e4 LT |
328 | release_resource(r); |
329 | } | |
1da177e4 LT |
330 | } |
331 | } | |
93ce3061 DT |
332 | EXPORT_SYMBOL_GPL(platform_device_del); |
333 | ||
334 | /** | |
4a3ad20c GKH |
335 | * platform_device_register - add a platform-level device |
336 | * @pdev: platform device we're adding | |
93ce3061 | 337 | */ |
4a3ad20c | 338 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
339 | { |
340 | device_initialize(&pdev->dev); | |
341 | return platform_device_add(pdev); | |
342 | } | |
a96b2042 | 343 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
344 | |
345 | /** | |
4a3ad20c GKH |
346 | * platform_device_unregister - unregister a platform-level device |
347 | * @pdev: platform device we're unregistering | |
93ce3061 | 348 | * |
4a3ad20c GKH |
349 | * Unregistration is done in 2 steps. First we release all resources |
350 | * and remove it from the subsystem, then we drop reference count by | |
351 | * calling platform_device_put(). | |
93ce3061 | 352 | */ |
4a3ad20c | 353 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
354 | { |
355 | platform_device_del(pdev); | |
356 | platform_device_put(pdev); | |
357 | } | |
a96b2042 | 358 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 359 | |
1da177e4 | 360 | /** |
4a3ad20c GKH |
361 | * platform_device_register_simple |
362 | * @name: base name of the device we're adding | |
363 | * @id: instance id | |
364 | * @res: set of resources that needs to be allocated for the device | |
365 | * @num: number of resources | |
1da177e4 | 366 | * |
4a3ad20c GKH |
367 | * This function creates a simple platform device that requires minimal |
368 | * resource and memory management. Canned release function freeing memory | |
369 | * allocated for the device allows drivers using such devices to be | |
370 | * unloaded without waiting for the last reference to the device to be | |
371 | * dropped. | |
49a4ec18 | 372 | * |
4a3ad20c GKH |
373 | * This interface is primarily intended for use with legacy drivers which |
374 | * probe hardware directly. Because such drivers create sysfs device nodes | |
375 | * themselves, rather than letting system infrastructure handle such device | |
376 | * enumeration tasks, they don't fully conform to the Linux driver model. | |
377 | * In particular, when such drivers are built as modules, they can't be | |
378 | * "hotplugged". | |
1da177e4 | 379 | */ |
4a3ad20c GKH |
380 | struct platform_device *platform_device_register_simple(const char *name, |
381 | int id, | |
382 | struct resource *res, | |
383 | unsigned int num) | |
1da177e4 | 384 | { |
37c12e74 | 385 | struct platform_device *pdev; |
1da177e4 LT |
386 | int retval; |
387 | ||
37c12e74 RK |
388 | pdev = platform_device_alloc(name, id); |
389 | if (!pdev) { | |
1da177e4 LT |
390 | retval = -ENOMEM; |
391 | goto error; | |
392 | } | |
393 | ||
1da177e4 | 394 | if (num) { |
37c12e74 RK |
395 | retval = platform_device_add_resources(pdev, res, num); |
396 | if (retval) | |
397 | goto error; | |
1da177e4 LT |
398 | } |
399 | ||
37c12e74 | 400 | retval = platform_device_add(pdev); |
1da177e4 LT |
401 | if (retval) |
402 | goto error; | |
403 | ||
37c12e74 | 404 | return pdev; |
1da177e4 LT |
405 | |
406 | error: | |
37c12e74 | 407 | platform_device_put(pdev); |
1da177e4 LT |
408 | return ERR_PTR(retval); |
409 | } | |
a96b2042 | 410 | EXPORT_SYMBOL_GPL(platform_device_register_simple); |
1da177e4 | 411 | |
d8bf2540 DB |
412 | /** |
413 | * platform_device_register_data | |
414 | * @parent: parent device for the device we're adding | |
415 | * @name: base name of the device we're adding | |
416 | * @id: instance id | |
417 | * @data: platform specific data for this platform device | |
418 | * @size: size of platform specific data | |
419 | * | |
420 | * This function creates a simple platform device that requires minimal | |
421 | * resource and memory management. Canned release function freeing memory | |
422 | * allocated for the device allows drivers using such devices to be | |
423 | * unloaded without waiting for the last reference to the device to be | |
424 | * dropped. | |
425 | */ | |
426 | struct platform_device *platform_device_register_data( | |
427 | struct device *parent, | |
428 | const char *name, int id, | |
429 | const void *data, size_t size) | |
430 | { | |
431 | struct platform_device *pdev; | |
432 | int retval; | |
433 | ||
434 | pdev = platform_device_alloc(name, id); | |
435 | if (!pdev) { | |
436 | retval = -ENOMEM; | |
437 | goto error; | |
438 | } | |
439 | ||
440 | pdev->dev.parent = parent; | |
441 | ||
442 | if (size) { | |
443 | retval = platform_device_add_data(pdev, data, size); | |
444 | if (retval) | |
445 | goto error; | |
446 | } | |
447 | ||
448 | retval = platform_device_add(pdev); | |
449 | if (retval) | |
450 | goto error; | |
451 | ||
452 | return pdev; | |
453 | ||
454 | error: | |
455 | platform_device_put(pdev); | |
456 | return ERR_PTR(retval); | |
457 | } | |
458 | ||
00d3dcdd RK |
459 | static int platform_drv_probe(struct device *_dev) |
460 | { | |
461 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
462 | struct platform_device *dev = to_platform_device(_dev); | |
463 | ||
464 | return drv->probe(dev); | |
465 | } | |
466 | ||
c67334fb DB |
467 | static int platform_drv_probe_fail(struct device *_dev) |
468 | { | |
469 | return -ENXIO; | |
470 | } | |
471 | ||
00d3dcdd RK |
472 | static int platform_drv_remove(struct device *_dev) |
473 | { | |
474 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
475 | struct platform_device *dev = to_platform_device(_dev); | |
476 | ||
477 | return drv->remove(dev); | |
478 | } | |
479 | ||
480 | static void platform_drv_shutdown(struct device *_dev) | |
481 | { | |
482 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
483 | struct platform_device *dev = to_platform_device(_dev); | |
484 | ||
485 | drv->shutdown(dev); | |
486 | } | |
487 | ||
488 | static int platform_drv_suspend(struct device *_dev, pm_message_t state) | |
489 | { | |
490 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
491 | struct platform_device *dev = to_platform_device(_dev); | |
492 | ||
493 | return drv->suspend(dev, state); | |
494 | } | |
495 | ||
496 | static int platform_drv_resume(struct device *_dev) | |
497 | { | |
498 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
499 | struct platform_device *dev = to_platform_device(_dev); | |
500 | ||
501 | return drv->resume(dev); | |
502 | } | |
503 | ||
504 | /** | |
4a3ad20c GKH |
505 | * platform_driver_register |
506 | * @drv: platform driver structure | |
00d3dcdd RK |
507 | */ |
508 | int platform_driver_register(struct platform_driver *drv) | |
509 | { | |
510 | drv->driver.bus = &platform_bus_type; | |
511 | if (drv->probe) | |
512 | drv->driver.probe = platform_drv_probe; | |
513 | if (drv->remove) | |
514 | drv->driver.remove = platform_drv_remove; | |
515 | if (drv->shutdown) | |
516 | drv->driver.shutdown = platform_drv_shutdown; | |
517 | if (drv->suspend) | |
518 | drv->driver.suspend = platform_drv_suspend; | |
519 | if (drv->resume) | |
520 | drv->driver.resume = platform_drv_resume; | |
521 | return driver_register(&drv->driver); | |
522 | } | |
523 | EXPORT_SYMBOL_GPL(platform_driver_register); | |
524 | ||
525 | /** | |
4a3ad20c GKH |
526 | * platform_driver_unregister |
527 | * @drv: platform driver structure | |
00d3dcdd RK |
528 | */ |
529 | void platform_driver_unregister(struct platform_driver *drv) | |
530 | { | |
531 | driver_unregister(&drv->driver); | |
532 | } | |
533 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
534 | ||
c67334fb DB |
535 | /** |
536 | * platform_driver_probe - register driver for non-hotpluggable device | |
537 | * @drv: platform driver structure | |
538 | * @probe: the driver probe routine, probably from an __init section | |
539 | * | |
540 | * Use this instead of platform_driver_register() when you know the device | |
541 | * is not hotpluggable and has already been registered, and you want to | |
542 | * remove its run-once probe() infrastructure from memory after the driver | |
543 | * has bound to the device. | |
544 | * | |
545 | * One typical use for this would be with drivers for controllers integrated | |
546 | * into system-on-chip processors, where the controller devices have been | |
547 | * configured as part of board setup. | |
548 | * | |
549 | * Returns zero if the driver registered and bound to a device, else returns | |
550 | * a negative error code and with the driver not registered. | |
551 | */ | |
c63e0783 | 552 | int __init_or_module platform_driver_probe(struct platform_driver *drv, |
c67334fb DB |
553 | int (*probe)(struct platform_device *)) |
554 | { | |
555 | int retval, code; | |
556 | ||
557 | /* temporary section violation during probe() */ | |
558 | drv->probe = probe; | |
559 | retval = code = platform_driver_register(drv); | |
560 | ||
561 | /* Fixup that section violation, being paranoid about code scanning | |
562 | * the list of drivers in order to probe new devices. Check to see | |
563 | * if the probe was successful, and make sure any forced probes of | |
564 | * new devices fail. | |
565 | */ | |
c6f7e72a | 566 | spin_lock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb | 567 | drv->probe = NULL; |
e5dd1278 | 568 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
569 | retval = -ENODEV; |
570 | drv->driver.probe = platform_drv_probe_fail; | |
c6f7e72a | 571 | spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); |
c67334fb DB |
572 | |
573 | if (code != retval) | |
574 | platform_driver_unregister(drv); | |
575 | return retval; | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(platform_driver_probe); | |
1da177e4 | 578 | |
a0245f7a DB |
579 | /* modalias support enables more hands-off userspace setup: |
580 | * (a) environment variable lets new-style hotplug events work once system is | |
581 | * fully running: "modprobe $MODALIAS" | |
582 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
583 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
584 | */ | |
4a3ad20c GKH |
585 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
586 | char *buf) | |
a0245f7a DB |
587 | { |
588 | struct platform_device *pdev = to_platform_device(dev); | |
43cc71ee | 589 | int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); |
a0245f7a DB |
590 | |
591 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
592 | } | |
593 | ||
594 | static struct device_attribute platform_dev_attrs[] = { | |
595 | __ATTR_RO(modalias), | |
596 | __ATTR_NULL, | |
597 | }; | |
598 | ||
7eff2e7a | 599 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
600 | { |
601 | struct platform_device *pdev = to_platform_device(dev); | |
602 | ||
57fee4a5 EM |
603 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
604 | (pdev->id_entry) ? pdev->id_entry->name : pdev->name); | |
a0245f7a DB |
605 | return 0; |
606 | } | |
607 | ||
57fee4a5 EM |
608 | static const struct platform_device_id *platform_match_id( |
609 | struct platform_device_id *id, | |
610 | struct platform_device *pdev) | |
611 | { | |
612 | while (id->name[0]) { | |
613 | if (strcmp(pdev->name, id->name) == 0) { | |
614 | pdev->id_entry = id; | |
615 | return id; | |
616 | } | |
617 | id++; | |
618 | } | |
619 | return NULL; | |
620 | } | |
621 | ||
1da177e4 | 622 | /** |
4a3ad20c GKH |
623 | * platform_match - bind platform device to platform driver. |
624 | * @dev: device. | |
625 | * @drv: driver. | |
1da177e4 | 626 | * |
4a3ad20c GKH |
627 | * Platform device IDs are assumed to be encoded like this: |
628 | * "<name><instance>", where <name> is a short description of the type of | |
629 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
630 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
631 | * "<name>". So, extract the <name> from the platform_device structure, | |
632 | * and compare it against the name of the driver. Return whether they match | |
633 | * or not. | |
1da177e4 | 634 | */ |
4a3ad20c | 635 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 636 | { |
71b3e0c1 | 637 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
638 | struct platform_driver *pdrv = to_platform_driver(drv); |
639 | ||
640 | /* match against the id table first */ | |
641 | if (pdrv->id_table) | |
642 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 643 | |
57fee4a5 | 644 | /* fall-back to driver name match */ |
1e0b2cf9 | 645 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
646 | } |
647 | ||
25e18499 RW |
648 | #ifdef CONFIG_PM_SLEEP |
649 | ||
650 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 LT |
651 | { |
652 | int ret = 0; | |
653 | ||
9480e307 | 654 | if (dev->driver && dev->driver->suspend) |
386415d8 DB |
655 | ret = dev->driver->suspend(dev, mesg); |
656 | ||
657 | return ret; | |
658 | } | |
659 | ||
25e18499 | 660 | static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg) |
386415d8 | 661 | { |
71b3e0c1 EM |
662 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
663 | struct platform_device *pdev = to_platform_device(dev); | |
386415d8 DB |
664 | int ret = 0; |
665 | ||
71b3e0c1 EM |
666 | if (dev->driver && pdrv->suspend_late) |
667 | ret = pdrv->suspend_late(pdev, mesg); | |
386415d8 DB |
668 | |
669 | return ret; | |
670 | } | |
671 | ||
25e18499 | 672 | static int platform_legacy_resume_early(struct device *dev) |
386415d8 | 673 | { |
71b3e0c1 EM |
674 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
675 | struct platform_device *pdev = to_platform_device(dev); | |
386415d8 DB |
676 | int ret = 0; |
677 | ||
71b3e0c1 EM |
678 | if (dev->driver && pdrv->resume_early) |
679 | ret = pdrv->resume_early(pdev); | |
9480e307 | 680 | |
1da177e4 LT |
681 | return ret; |
682 | } | |
683 | ||
25e18499 | 684 | static int platform_legacy_resume(struct device *dev) |
1da177e4 LT |
685 | { |
686 | int ret = 0; | |
687 | ||
9480e307 RK |
688 | if (dev->driver && dev->driver->resume) |
689 | ret = dev->driver->resume(dev); | |
690 | ||
1da177e4 LT |
691 | return ret; |
692 | } | |
693 | ||
25e18499 RW |
694 | static int platform_pm_prepare(struct device *dev) |
695 | { | |
696 | struct device_driver *drv = dev->driver; | |
697 | int ret = 0; | |
698 | ||
699 | if (drv && drv->pm && drv->pm->prepare) | |
700 | ret = drv->pm->prepare(dev); | |
701 | ||
702 | return ret; | |
703 | } | |
704 | ||
705 | static void platform_pm_complete(struct device *dev) | |
706 | { | |
707 | struct device_driver *drv = dev->driver; | |
708 | ||
709 | if (drv && drv->pm && drv->pm->complete) | |
710 | drv->pm->complete(dev); | |
711 | } | |
712 | ||
713 | #ifdef CONFIG_SUSPEND | |
714 | ||
715 | static int platform_pm_suspend(struct device *dev) | |
716 | { | |
717 | struct device_driver *drv = dev->driver; | |
718 | int ret = 0; | |
719 | ||
adf09493 RW |
720 | if (!drv) |
721 | return 0; | |
722 | ||
723 | if (drv->pm) { | |
25e18499 RW |
724 | if (drv->pm->suspend) |
725 | ret = drv->pm->suspend(dev); | |
726 | } else { | |
727 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
728 | } | |
729 | ||
730 | return ret; | |
731 | } | |
732 | ||
733 | static int platform_pm_suspend_noirq(struct device *dev) | |
734 | { | |
adf09493 | 735 | struct device_driver *drv = dev->driver; |
25e18499 RW |
736 | int ret = 0; |
737 | ||
adf09493 | 738 | if (!drv) |
25e18499 RW |
739 | return 0; |
740 | ||
adf09493 RW |
741 | if (drv->pm) { |
742 | if (drv->pm->suspend_noirq) | |
743 | ret = drv->pm->suspend_noirq(dev); | |
25e18499 RW |
744 | } else { |
745 | ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND); | |
746 | } | |
747 | ||
748 | return ret; | |
749 | } | |
750 | ||
751 | static int platform_pm_resume(struct device *dev) | |
752 | { | |
753 | struct device_driver *drv = dev->driver; | |
754 | int ret = 0; | |
755 | ||
adf09493 RW |
756 | if (!drv) |
757 | return 0; | |
758 | ||
759 | if (drv->pm) { | |
25e18499 RW |
760 | if (drv->pm->resume) |
761 | ret = drv->pm->resume(dev); | |
762 | } else { | |
763 | ret = platform_legacy_resume(dev); | |
764 | } | |
765 | ||
766 | return ret; | |
767 | } | |
768 | ||
769 | static int platform_pm_resume_noirq(struct device *dev) | |
770 | { | |
adf09493 | 771 | struct device_driver *drv = dev->driver; |
25e18499 RW |
772 | int ret = 0; |
773 | ||
adf09493 | 774 | if (!drv) |
25e18499 RW |
775 | return 0; |
776 | ||
adf09493 RW |
777 | if (drv->pm) { |
778 | if (drv->pm->resume_noirq) | |
779 | ret = drv->pm->resume_noirq(dev); | |
25e18499 RW |
780 | } else { |
781 | ret = platform_legacy_resume_early(dev); | |
782 | } | |
783 | ||
784 | return ret; | |
785 | } | |
786 | ||
787 | #else /* !CONFIG_SUSPEND */ | |
788 | ||
789 | #define platform_pm_suspend NULL | |
790 | #define platform_pm_resume NULL | |
791 | #define platform_pm_suspend_noirq NULL | |
792 | #define platform_pm_resume_noirq NULL | |
793 | ||
794 | #endif /* !CONFIG_SUSPEND */ | |
795 | ||
796 | #ifdef CONFIG_HIBERNATION | |
797 | ||
798 | static int platform_pm_freeze(struct device *dev) | |
799 | { | |
800 | struct device_driver *drv = dev->driver; | |
801 | int ret = 0; | |
802 | ||
803 | if (!drv) | |
804 | return 0; | |
805 | ||
806 | if (drv->pm) { | |
807 | if (drv->pm->freeze) | |
808 | ret = drv->pm->freeze(dev); | |
809 | } else { | |
810 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
811 | } | |
812 | ||
813 | return ret; | |
814 | } | |
815 | ||
816 | static int platform_pm_freeze_noirq(struct device *dev) | |
817 | { | |
adf09493 | 818 | struct device_driver *drv = dev->driver; |
25e18499 RW |
819 | int ret = 0; |
820 | ||
adf09493 | 821 | if (!drv) |
25e18499 RW |
822 | return 0; |
823 | ||
adf09493 RW |
824 | if (drv->pm) { |
825 | if (drv->pm->freeze_noirq) | |
826 | ret = drv->pm->freeze_noirq(dev); | |
25e18499 RW |
827 | } else { |
828 | ret = platform_legacy_suspend_late(dev, PMSG_FREEZE); | |
829 | } | |
830 | ||
831 | return ret; | |
832 | } | |
833 | ||
834 | static int platform_pm_thaw(struct device *dev) | |
835 | { | |
836 | struct device_driver *drv = dev->driver; | |
837 | int ret = 0; | |
838 | ||
adf09493 RW |
839 | if (!drv) |
840 | return 0; | |
841 | ||
842 | if (drv->pm) { | |
25e18499 RW |
843 | if (drv->pm->thaw) |
844 | ret = drv->pm->thaw(dev); | |
845 | } else { | |
846 | ret = platform_legacy_resume(dev); | |
847 | } | |
848 | ||
849 | return ret; | |
850 | } | |
851 | ||
852 | static int platform_pm_thaw_noirq(struct device *dev) | |
853 | { | |
adf09493 | 854 | struct device_driver *drv = dev->driver; |
25e18499 RW |
855 | int ret = 0; |
856 | ||
adf09493 | 857 | if (!drv) |
25e18499 RW |
858 | return 0; |
859 | ||
adf09493 RW |
860 | if (drv->pm) { |
861 | if (drv->pm->thaw_noirq) | |
862 | ret = drv->pm->thaw_noirq(dev); | |
25e18499 RW |
863 | } else { |
864 | ret = platform_legacy_resume_early(dev); | |
865 | } | |
866 | ||
867 | return ret; | |
868 | } | |
869 | ||
870 | static int platform_pm_poweroff(struct device *dev) | |
871 | { | |
872 | struct device_driver *drv = dev->driver; | |
873 | int ret = 0; | |
874 | ||
adf09493 RW |
875 | if (!drv) |
876 | return 0; | |
877 | ||
878 | if (drv->pm) { | |
25e18499 RW |
879 | if (drv->pm->poweroff) |
880 | ret = drv->pm->poweroff(dev); | |
881 | } else { | |
882 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
883 | } | |
884 | ||
885 | return ret; | |
886 | } | |
887 | ||
888 | static int platform_pm_poweroff_noirq(struct device *dev) | |
889 | { | |
adf09493 | 890 | struct device_driver *drv = dev->driver; |
25e18499 RW |
891 | int ret = 0; |
892 | ||
adf09493 | 893 | if (!drv) |
25e18499 RW |
894 | return 0; |
895 | ||
adf09493 RW |
896 | if (drv->pm) { |
897 | if (drv->pm->poweroff_noirq) | |
898 | ret = drv->pm->poweroff_noirq(dev); | |
25e18499 RW |
899 | } else { |
900 | ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
901 | } | |
902 | ||
903 | return ret; | |
904 | } | |
905 | ||
906 | static int platform_pm_restore(struct device *dev) | |
907 | { | |
908 | struct device_driver *drv = dev->driver; | |
909 | int ret = 0; | |
910 | ||
adf09493 RW |
911 | if (!drv) |
912 | return 0; | |
913 | ||
914 | if (drv->pm) { | |
25e18499 RW |
915 | if (drv->pm->restore) |
916 | ret = drv->pm->restore(dev); | |
917 | } else { | |
918 | ret = platform_legacy_resume(dev); | |
919 | } | |
920 | ||
921 | return ret; | |
922 | } | |
923 | ||
924 | static int platform_pm_restore_noirq(struct device *dev) | |
925 | { | |
adf09493 | 926 | struct device_driver *drv = dev->driver; |
25e18499 RW |
927 | int ret = 0; |
928 | ||
adf09493 | 929 | if (!drv) |
25e18499 RW |
930 | return 0; |
931 | ||
adf09493 RW |
932 | if (drv->pm) { |
933 | if (drv->pm->restore_noirq) | |
934 | ret = drv->pm->restore_noirq(dev); | |
25e18499 RW |
935 | } else { |
936 | ret = platform_legacy_resume_early(dev); | |
937 | } | |
938 | ||
939 | return ret; | |
940 | } | |
941 | ||
942 | #else /* !CONFIG_HIBERNATION */ | |
943 | ||
944 | #define platform_pm_freeze NULL | |
945 | #define platform_pm_thaw NULL | |
946 | #define platform_pm_poweroff NULL | |
947 | #define platform_pm_restore NULL | |
948 | #define platform_pm_freeze_noirq NULL | |
949 | #define platform_pm_thaw_noirq NULL | |
950 | #define platform_pm_poweroff_noirq NULL | |
951 | #define platform_pm_restore_noirq NULL | |
952 | ||
953 | #endif /* !CONFIG_HIBERNATION */ | |
954 | ||
adf09493 RW |
955 | static struct dev_pm_ops platform_dev_pm_ops = { |
956 | .prepare = platform_pm_prepare, | |
957 | .complete = platform_pm_complete, | |
958 | .suspend = platform_pm_suspend, | |
959 | .resume = platform_pm_resume, | |
960 | .freeze = platform_pm_freeze, | |
961 | .thaw = platform_pm_thaw, | |
962 | .poweroff = platform_pm_poweroff, | |
963 | .restore = platform_pm_restore, | |
25e18499 RW |
964 | .suspend_noirq = platform_pm_suspend_noirq, |
965 | .resume_noirq = platform_pm_resume_noirq, | |
966 | .freeze_noirq = platform_pm_freeze_noirq, | |
967 | .thaw_noirq = platform_pm_thaw_noirq, | |
968 | .poweroff_noirq = platform_pm_poweroff_noirq, | |
969 | .restore_noirq = platform_pm_restore_noirq, | |
970 | }; | |
971 | ||
adf09493 | 972 | #define PLATFORM_PM_OPS_PTR (&platform_dev_pm_ops) |
25e18499 RW |
973 | |
974 | #else /* !CONFIG_PM_SLEEP */ | |
975 | ||
976 | #define PLATFORM_PM_OPS_PTR NULL | |
977 | ||
978 | #endif /* !CONFIG_PM_SLEEP */ | |
979 | ||
1da177e4 LT |
980 | struct bus_type platform_bus_type = { |
981 | .name = "platform", | |
a0245f7a | 982 | .dev_attrs = platform_dev_attrs, |
1da177e4 | 983 | .match = platform_match, |
a0245f7a | 984 | .uevent = platform_uevent, |
25e18499 | 985 | .pm = PLATFORM_PM_OPS_PTR, |
1da177e4 | 986 | }; |
a96b2042 | 987 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
988 | |
989 | int __init platform_bus_init(void) | |
990 | { | |
fbfb1445 CH |
991 | int error; |
992 | ||
993 | error = device_register(&platform_bus); | |
994 | if (error) | |
995 | return error; | |
996 | error = bus_register(&platform_bus_type); | |
997 | if (error) | |
998 | device_unregister(&platform_bus); | |
999 | return error; | |
1da177e4 LT |
1000 | } |
1001 | ||
1002 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
1003 | u64 dma_get_required_mask(struct device *dev) | |
1004 | { | |
1005 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
1006 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
1007 | u64 mask; | |
1008 | ||
1009 | if (!high_totalram) { | |
1010 | /* convert to mask just covering totalram */ | |
1011 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
1012 | low_totalram += low_totalram - 1; | |
1013 | mask = low_totalram; | |
1014 | } else { | |
1015 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1016 | high_totalram += high_totalram - 1; | |
1017 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1018 | } | |
e88a0c2c | 1019 | return mask; |
1da177e4 LT |
1020 | } |
1021 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
1022 | #endif |