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Commit | Line | Data |
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25a010c8 CN |
1 | /* |
2 | * printer.c -- Printer gadget driver | |
3 | * | |
4 | * Copyright (C) 2003-2005 David Brownell | |
5 | * Copyright (C) 2006 Craig W. Nadler | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/slab.h> | |
925ce689 | 28 | #include <linux/mutex.h> |
25a010c8 CN |
29 | #include <linux/errno.h> |
30 | #include <linux/init.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/list.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/utsname.h> | |
35 | #include <linux/device.h> | |
36 | #include <linux/moduleparam.h> | |
37 | #include <linux/fs.h> | |
38 | #include <linux/poll.h> | |
39 | #include <linux/types.h> | |
40 | #include <linux/ctype.h> | |
41 | #include <linux/cdev.h> | |
42 | ||
43 | #include <asm/byteorder.h> | |
44 | #include <linux/io.h> | |
45 | #include <linux/irq.h> | |
46 | #include <asm/system.h> | |
47 | #include <linux/uaccess.h> | |
48 | #include <asm/unaligned.h> | |
49 | ||
50 | #include <linux/usb/ch9.h> | |
51 | #include <linux/usb/gadget.h> | |
52 | #include <linux/usb/g_printer.h> | |
53 | ||
54 | #include "gadget_chips.h" | |
55 | ||
0a56b03f DB |
56 | |
57 | /* | |
58 | * Kbuild is not very cooperative with respect to linking separately | |
59 | * compiled library objects into one module. So for now we won't use | |
60 | * separate compilation ... ensuring init/exit sections work to shrink | |
61 | * the runtime footprint, and giving us at least some parts of what | |
62 | * a "gcc --combine ... part1.c part2.c part3.c ... " build would. | |
63 | */ | |
64 | #include "usbstring.c" | |
65 | #include "config.c" | |
66 | #include "epautoconf.c" | |
67 | ||
68 | /*-------------------------------------------------------------------------*/ | |
69 | ||
25a010c8 CN |
70 | #define DRIVER_DESC "Printer Gadget" |
71 | #define DRIVER_VERSION "2007 OCT 06" | |
72 | ||
925ce689 | 73 | static DEFINE_MUTEX(printer_mutex); |
25a010c8 CN |
74 | static const char shortname [] = "printer"; |
75 | static const char driver_desc [] = DRIVER_DESC; | |
76 | ||
77 | static dev_t g_printer_devno; | |
78 | ||
79 | static struct class *usb_gadget_class; | |
80 | ||
81 | /*-------------------------------------------------------------------------*/ | |
82 | ||
83 | struct printer_dev { | |
84 | spinlock_t lock; /* lock this structure */ | |
85 | /* lock buffer lists during read/write calls */ | |
10ca4425 | 86 | struct mutex lock_printer_io; |
25a010c8 CN |
87 | struct usb_gadget *gadget; |
88 | struct usb_request *req; /* for control responses */ | |
89 | u8 config; | |
90 | s8 interface; | |
91 | struct usb_ep *in_ep, *out_ep; | |
92 | const struct usb_endpoint_descriptor | |
93 | *in, *out; | |
94 | struct list_head rx_reqs; /* List of free RX structs */ | |
95 | struct list_head rx_reqs_active; /* List of Active RX xfers */ | |
96 | struct list_head rx_buffers; /* List of completed xfers */ | |
97 | /* wait until there is data to be read. */ | |
98 | wait_queue_head_t rx_wait; | |
99 | struct list_head tx_reqs; /* List of free TX structs */ | |
100 | struct list_head tx_reqs_active; /* List of Active TX xfers */ | |
101 | /* Wait until there are write buffers available to use. */ | |
102 | wait_queue_head_t tx_wait; | |
103 | /* Wait until all write buffers have been sent. */ | |
104 | wait_queue_head_t tx_flush_wait; | |
105 | struct usb_request *current_rx_req; | |
106 | size_t current_rx_bytes; | |
107 | u8 *current_rx_buf; | |
108 | u8 printer_status; | |
109 | u8 reset_printer; | |
25a010c8 CN |
110 | struct cdev printer_cdev; |
111 | struct device *pdev; | |
112 | u8 printer_cdev_open; | |
113 | wait_queue_head_t wait; | |
114 | }; | |
115 | ||
116 | static struct printer_dev usb_printer_gadget; | |
117 | ||
118 | /*-------------------------------------------------------------------------*/ | |
119 | ||
120 | /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! | |
121 | * Instead: allocate your own, using normal USB-IF procedures. | |
122 | */ | |
123 | ||
124 | /* Thanks to NetChip Technologies for donating this product ID. | |
125 | */ | |
126 | #define PRINTER_VENDOR_NUM 0x0525 /* NetChip */ | |
127 | #define PRINTER_PRODUCT_NUM 0xa4a8 /* Linux-USB Printer Gadget */ | |
128 | ||
129 | /* Some systems will want different product identifers published in the | |
130 | * device descriptor, either numbers or strings or both. These string | |
131 | * parameters are in UTF-8 (superset of ASCII's 7 bit characters). | |
132 | */ | |
133 | ||
134 | static ushort __initdata idVendor; | |
135 | module_param(idVendor, ushort, S_IRUGO); | |
136 | MODULE_PARM_DESC(idVendor, "USB Vendor ID"); | |
137 | ||
138 | static ushort __initdata idProduct; | |
139 | module_param(idProduct, ushort, S_IRUGO); | |
140 | MODULE_PARM_DESC(idProduct, "USB Product ID"); | |
141 | ||
142 | static ushort __initdata bcdDevice; | |
143 | module_param(bcdDevice, ushort, S_IRUGO); | |
144 | MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)"); | |
145 | ||
146 | static char *__initdata iManufacturer; | |
147 | module_param(iManufacturer, charp, S_IRUGO); | |
148 | MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); | |
149 | ||
150 | static char *__initdata iProduct; | |
151 | module_param(iProduct, charp, S_IRUGO); | |
152 | MODULE_PARM_DESC(iProduct, "USB Product string"); | |
153 | ||
154 | static char *__initdata iSerialNum; | |
155 | module_param(iSerialNum, charp, S_IRUGO); | |
156 | MODULE_PARM_DESC(iSerialNum, "1"); | |
157 | ||
158 | static char *__initdata iPNPstring; | |
159 | module_param(iPNPstring, charp, S_IRUGO); | |
160 | MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;"); | |
161 | ||
162 | /* Number of requests to allocate per endpoint, not used for ep0. */ | |
163 | static unsigned qlen = 10; | |
164 | module_param(qlen, uint, S_IRUGO|S_IWUSR); | |
165 | ||
166 | #define QLEN qlen | |
167 | ||
168 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
169 | #define DEVSPEED USB_SPEED_HIGH | |
170 | #else /* full speed (low speed doesn't do bulk) */ | |
171 | #define DEVSPEED USB_SPEED_FULL | |
172 | #endif | |
173 | ||
174 | /*-------------------------------------------------------------------------*/ | |
175 | ||
176 | #define xprintk(d, level, fmt, args...) \ | |
177 | printk(level "%s: " fmt, DRIVER_DESC, ## args) | |
178 | ||
179 | #ifdef DEBUG | |
180 | #define DBG(dev, fmt, args...) \ | |
181 | xprintk(dev, KERN_DEBUG, fmt, ## args) | |
182 | #else | |
183 | #define DBG(dev, fmt, args...) \ | |
184 | do { } while (0) | |
185 | #endif /* DEBUG */ | |
186 | ||
187 | #ifdef VERBOSE | |
188 | #define VDBG(dev, fmt, args...) \ | |
189 | xprintk(dev, KERN_DEBUG, fmt, ## args) | |
190 | #else | |
191 | #define VDBG(dev, fmt, args...) \ | |
192 | do { } while (0) | |
193 | #endif /* VERBOSE */ | |
194 | ||
195 | #define ERROR(dev, fmt, args...) \ | |
196 | xprintk(dev, KERN_ERR, fmt, ## args) | |
b6c63937 | 197 | #define WARNING(dev, fmt, args...) \ |
25a010c8 CN |
198 | xprintk(dev, KERN_WARNING, fmt, ## args) |
199 | #define INFO(dev, fmt, args...) \ | |
200 | xprintk(dev, KERN_INFO, fmt, ## args) | |
201 | ||
202 | /*-------------------------------------------------------------------------*/ | |
203 | ||
204 | /* USB DRIVER HOOKUP (to the hardware driver, below us), mostly | |
205 | * ep0 implementation: descriptors, config management, setup(). | |
206 | * also optional class-specific notification interrupt transfer. | |
207 | */ | |
208 | ||
209 | /* | |
210 | * DESCRIPTORS ... most are static, but strings and (full) configuration | |
211 | * descriptors are built on demand. | |
212 | */ | |
213 | ||
214 | #define STRING_MANUFACTURER 1 | |
215 | #define STRING_PRODUCT 2 | |
216 | #define STRING_SERIALNUM 3 | |
217 | ||
218 | /* holds our biggest descriptor */ | |
219 | #define USB_DESC_BUFSIZE 256 | |
220 | #define USB_BUFSIZE 8192 | |
221 | ||
222 | /* This device advertises one configuration. */ | |
223 | #define DEV_CONFIG_VALUE 1 | |
224 | #define PRINTER_INTERFACE 0 | |
225 | ||
226 | static struct usb_device_descriptor device_desc = { | |
227 | .bLength = sizeof device_desc, | |
228 | .bDescriptorType = USB_DT_DEVICE, | |
551509d2 | 229 | .bcdUSB = cpu_to_le16(0x0200), |
25a010c8 CN |
230 | .bDeviceClass = USB_CLASS_PER_INTERFACE, |
231 | .bDeviceSubClass = 0, | |
232 | .bDeviceProtocol = 0, | |
551509d2 HH |
233 | .idVendor = cpu_to_le16(PRINTER_VENDOR_NUM), |
234 | .idProduct = cpu_to_le16(PRINTER_PRODUCT_NUM), | |
25a010c8 CN |
235 | .iManufacturer = STRING_MANUFACTURER, |
236 | .iProduct = STRING_PRODUCT, | |
237 | .iSerialNumber = STRING_SERIALNUM, | |
238 | .bNumConfigurations = 1 | |
239 | }; | |
240 | ||
241 | static struct usb_otg_descriptor otg_desc = { | |
242 | .bLength = sizeof otg_desc, | |
243 | .bDescriptorType = USB_DT_OTG, | |
244 | .bmAttributes = USB_OTG_SRP | |
245 | }; | |
246 | ||
247 | static struct usb_config_descriptor config_desc = { | |
248 | .bLength = sizeof config_desc, | |
249 | .bDescriptorType = USB_DT_CONFIG, | |
250 | ||
251 | /* compute wTotalLength on the fly */ | |
252 | .bNumInterfaces = 1, | |
253 | .bConfigurationValue = DEV_CONFIG_VALUE, | |
254 | .iConfiguration = 0, | |
255 | .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER, | |
36e893d2 | 256 | .bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2, |
25a010c8 CN |
257 | }; |
258 | ||
259 | static struct usb_interface_descriptor intf_desc = { | |
260 | .bLength = sizeof intf_desc, | |
261 | .bDescriptorType = USB_DT_INTERFACE, | |
262 | .bInterfaceNumber = PRINTER_INTERFACE, | |
263 | .bNumEndpoints = 2, | |
264 | .bInterfaceClass = USB_CLASS_PRINTER, | |
265 | .bInterfaceSubClass = 1, /* Printer Sub-Class */ | |
266 | .bInterfaceProtocol = 2, /* Bi-Directional */ | |
267 | .iInterface = 0 | |
268 | }; | |
269 | ||
270 | static struct usb_endpoint_descriptor fs_ep_in_desc = { | |
271 | .bLength = USB_DT_ENDPOINT_SIZE, | |
272 | .bDescriptorType = USB_DT_ENDPOINT, | |
273 | .bEndpointAddress = USB_DIR_IN, | |
274 | .bmAttributes = USB_ENDPOINT_XFER_BULK | |
275 | }; | |
276 | ||
277 | static struct usb_endpoint_descriptor fs_ep_out_desc = { | |
278 | .bLength = USB_DT_ENDPOINT_SIZE, | |
279 | .bDescriptorType = USB_DT_ENDPOINT, | |
280 | .bEndpointAddress = USB_DIR_OUT, | |
281 | .bmAttributes = USB_ENDPOINT_XFER_BULK | |
282 | }; | |
283 | ||
284 | static const struct usb_descriptor_header *fs_printer_function [11] = { | |
285 | (struct usb_descriptor_header *) &otg_desc, | |
286 | (struct usb_descriptor_header *) &intf_desc, | |
287 | (struct usb_descriptor_header *) &fs_ep_in_desc, | |
288 | (struct usb_descriptor_header *) &fs_ep_out_desc, | |
289 | NULL | |
290 | }; | |
291 | ||
292 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
293 | ||
294 | /* | |
295 | * usb 2.0 devices need to expose both high speed and full speed | |
296 | * descriptors, unless they only run at full speed. | |
297 | */ | |
298 | ||
299 | static struct usb_endpoint_descriptor hs_ep_in_desc = { | |
300 | .bLength = USB_DT_ENDPOINT_SIZE, | |
301 | .bDescriptorType = USB_DT_ENDPOINT, | |
302 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 303 | .wMaxPacketSize = cpu_to_le16(512) |
25a010c8 CN |
304 | }; |
305 | ||
306 | static struct usb_endpoint_descriptor hs_ep_out_desc = { | |
307 | .bLength = USB_DT_ENDPOINT_SIZE, | |
308 | .bDescriptorType = USB_DT_ENDPOINT, | |
309 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 310 | .wMaxPacketSize = cpu_to_le16(512) |
25a010c8 CN |
311 | }; |
312 | ||
313 | static struct usb_qualifier_descriptor dev_qualifier = { | |
314 | .bLength = sizeof dev_qualifier, | |
315 | .bDescriptorType = USB_DT_DEVICE_QUALIFIER, | |
551509d2 | 316 | .bcdUSB = cpu_to_le16(0x0200), |
25a010c8 CN |
317 | .bDeviceClass = USB_CLASS_PRINTER, |
318 | .bNumConfigurations = 1 | |
319 | }; | |
320 | ||
321 | static const struct usb_descriptor_header *hs_printer_function [11] = { | |
322 | (struct usb_descriptor_header *) &otg_desc, | |
323 | (struct usb_descriptor_header *) &intf_desc, | |
324 | (struct usb_descriptor_header *) &hs_ep_in_desc, | |
325 | (struct usb_descriptor_header *) &hs_ep_out_desc, | |
326 | NULL | |
327 | }; | |
328 | ||
329 | /* maxpacket and other transfer characteristics vary by speed. */ | |
330 | #define ep_desc(g, hs, fs) (((g)->speed == USB_SPEED_HIGH)?(hs):(fs)) | |
331 | ||
332 | #else | |
333 | ||
334 | /* if there's no high speed support, maxpacket doesn't change. */ | |
335 | #define ep_desc(g, hs, fs) (((void)(g)), (fs)) | |
336 | ||
337 | #endif /* !CONFIG_USB_GADGET_DUALSPEED */ | |
338 | ||
339 | /*-------------------------------------------------------------------------*/ | |
340 | ||
341 | /* descriptors that are built on-demand */ | |
342 | ||
343 | static char manufacturer [50]; | |
344 | static char product_desc [40] = DRIVER_DESC; | |
345 | static char serial_num [40] = "1"; | |
346 | static char pnp_string [1024] = | |
347 | "XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;"; | |
348 | ||
349 | /* static strings, in UTF-8 */ | |
350 | static struct usb_string strings [] = { | |
351 | { STRING_MANUFACTURER, manufacturer, }, | |
352 | { STRING_PRODUCT, product_desc, }, | |
353 | { STRING_SERIALNUM, serial_num, }, | |
354 | { } /* end of list */ | |
355 | }; | |
356 | ||
357 | static struct usb_gadget_strings stringtab = { | |
358 | .language = 0x0409, /* en-us */ | |
359 | .strings = strings, | |
360 | }; | |
361 | ||
362 | /*-------------------------------------------------------------------------*/ | |
363 | ||
364 | static struct usb_request * | |
365 | printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags) | |
366 | { | |
367 | struct usb_request *req; | |
368 | ||
369 | req = usb_ep_alloc_request(ep, gfp_flags); | |
370 | ||
371 | if (req != NULL) { | |
372 | req->length = len; | |
373 | req->buf = kmalloc(len, gfp_flags); | |
374 | if (req->buf == NULL) { | |
375 | usb_ep_free_request(ep, req); | |
376 | return NULL; | |
377 | } | |
378 | } | |
379 | ||
380 | return req; | |
381 | } | |
382 | ||
383 | static void | |
384 | printer_req_free(struct usb_ep *ep, struct usb_request *req) | |
385 | { | |
386 | if (ep != NULL && req != NULL) { | |
387 | kfree(req->buf); | |
388 | usb_ep_free_request(ep, req); | |
389 | } | |
390 | } | |
391 | ||
392 | /*-------------------------------------------------------------------------*/ | |
393 | ||
394 | static void rx_complete(struct usb_ep *ep, struct usb_request *req) | |
395 | { | |
396 | struct printer_dev *dev = ep->driver_data; | |
397 | int status = req->status; | |
398 | unsigned long flags; | |
399 | ||
400 | spin_lock_irqsave(&dev->lock, flags); | |
401 | ||
402 | list_del_init(&req->list); /* Remode from Active List */ | |
403 | ||
404 | switch (status) { | |
405 | ||
406 | /* normal completion */ | |
407 | case 0: | |
cc901bbb CN |
408 | if (req->actual > 0) { |
409 | list_add_tail(&req->list, &dev->rx_buffers); | |
410 | DBG(dev, "G_Printer : rx length %d\n", req->actual); | |
411 | } else { | |
412 | list_add(&req->list, &dev->rx_reqs); | |
413 | } | |
25a010c8 CN |
414 | break; |
415 | ||
416 | /* software-driven interface shutdown */ | |
417 | case -ECONNRESET: /* unlink */ | |
418 | case -ESHUTDOWN: /* disconnect etc */ | |
419 | VDBG(dev, "rx shutdown, code %d\n", status); | |
420 | list_add(&req->list, &dev->rx_reqs); | |
421 | break; | |
422 | ||
423 | /* for hardware automagic (such as pxa) */ | |
424 | case -ECONNABORTED: /* endpoint reset */ | |
425 | DBG(dev, "rx %s reset\n", ep->name); | |
426 | list_add(&req->list, &dev->rx_reqs); | |
427 | break; | |
428 | ||
429 | /* data overrun */ | |
430 | case -EOVERFLOW: | |
431 | /* FALLTHROUGH */ | |
432 | ||
433 | default: | |
434 | DBG(dev, "rx status %d\n", status); | |
435 | list_add(&req->list, &dev->rx_reqs); | |
436 | break; | |
437 | } | |
cc901bbb CN |
438 | |
439 | wake_up_interruptible(&dev->rx_wait); | |
25a010c8 CN |
440 | spin_unlock_irqrestore(&dev->lock, flags); |
441 | } | |
442 | ||
443 | static void tx_complete(struct usb_ep *ep, struct usb_request *req) | |
444 | { | |
445 | struct printer_dev *dev = ep->driver_data; | |
446 | ||
447 | switch (req->status) { | |
448 | default: | |
449 | VDBG(dev, "tx err %d\n", req->status); | |
450 | /* FALLTHROUGH */ | |
451 | case -ECONNRESET: /* unlink */ | |
452 | case -ESHUTDOWN: /* disconnect etc */ | |
453 | break; | |
454 | case 0: | |
455 | break; | |
456 | } | |
457 | ||
458 | spin_lock(&dev->lock); | |
459 | /* Take the request struct off the active list and put it on the | |
460 | * free list. | |
461 | */ | |
462 | list_del_init(&req->list); | |
463 | list_add(&req->list, &dev->tx_reqs); | |
464 | wake_up_interruptible(&dev->tx_wait); | |
465 | if (likely(list_empty(&dev->tx_reqs_active))) | |
466 | wake_up_interruptible(&dev->tx_flush_wait); | |
467 | ||
468 | spin_unlock(&dev->lock); | |
469 | } | |
470 | ||
471 | /*-------------------------------------------------------------------------*/ | |
472 | ||
473 | static int | |
474 | printer_open(struct inode *inode, struct file *fd) | |
475 | { | |
476 | struct printer_dev *dev; | |
477 | unsigned long flags; | |
478 | int ret = -EBUSY; | |
479 | ||
925ce689 | 480 | mutex_lock(&printer_mutex); |
25a010c8 CN |
481 | dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev); |
482 | ||
483 | spin_lock_irqsave(&dev->lock, flags); | |
484 | ||
485 | if (!dev->printer_cdev_open) { | |
486 | dev->printer_cdev_open = 1; | |
487 | fd->private_data = dev; | |
488 | ret = 0; | |
489 | /* Change the printer status to show that it's on-line. */ | |
490 | dev->printer_status |= PRINTER_SELECTED; | |
491 | } | |
492 | ||
493 | spin_unlock_irqrestore(&dev->lock, flags); | |
494 | ||
495 | DBG(dev, "printer_open returned %x\n", ret); | |
925ce689 | 496 | mutex_unlock(&printer_mutex); |
25a010c8 CN |
497 | return ret; |
498 | } | |
499 | ||
500 | static int | |
501 | printer_close(struct inode *inode, struct file *fd) | |
502 | { | |
503 | struct printer_dev *dev = fd->private_data; | |
504 | unsigned long flags; | |
505 | ||
506 | spin_lock_irqsave(&dev->lock, flags); | |
507 | dev->printer_cdev_open = 0; | |
508 | fd->private_data = NULL; | |
509 | /* Change printer status to show that the printer is off-line. */ | |
510 | dev->printer_status &= ~PRINTER_SELECTED; | |
511 | spin_unlock_irqrestore(&dev->lock, flags); | |
512 | ||
513 | DBG(dev, "printer_close\n"); | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
cc901bbb CN |
518 | /* This function must be called with interrupts turned off. */ |
519 | static void | |
520 | setup_rx_reqs(struct printer_dev *dev) | |
521 | { | |
522 | struct usb_request *req; | |
523 | ||
524 | while (likely(!list_empty(&dev->rx_reqs))) { | |
525 | int error; | |
526 | ||
527 | req = container_of(dev->rx_reqs.next, | |
528 | struct usb_request, list); | |
529 | list_del_init(&req->list); | |
530 | ||
531 | /* The USB Host sends us whatever amount of data it wants to | |
532 | * so we always set the length field to the full USB_BUFSIZE. | |
533 | * If the amount of data is more than the read() caller asked | |
534 | * for it will be stored in the request buffer until it is | |
535 | * asked for by read(). | |
536 | */ | |
537 | req->length = USB_BUFSIZE; | |
538 | req->complete = rx_complete; | |
539 | ||
540 | error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC); | |
541 | if (error) { | |
542 | DBG(dev, "rx submit --> %d\n", error); | |
543 | list_add(&req->list, &dev->rx_reqs); | |
544 | break; | |
545 | } else { | |
546 | list_add(&req->list, &dev->rx_reqs_active); | |
547 | } | |
548 | } | |
549 | } | |
550 | ||
25a010c8 CN |
551 | static ssize_t |
552 | printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr) | |
553 | { | |
554 | struct printer_dev *dev = fd->private_data; | |
555 | unsigned long flags; | |
556 | size_t size; | |
557 | size_t bytes_copied; | |
558 | struct usb_request *req; | |
559 | /* This is a pointer to the current USB rx request. */ | |
560 | struct usb_request *current_rx_req; | |
561 | /* This is the number of bytes in the current rx buffer. */ | |
562 | size_t current_rx_bytes; | |
563 | /* This is a pointer to the current rx buffer. */ | |
564 | u8 *current_rx_buf; | |
565 | ||
566 | if (len == 0) | |
567 | return -EINVAL; | |
568 | ||
569 | DBG(dev, "printer_read trying to read %d bytes\n", (int)len); | |
570 | ||
10ca4425 | 571 | mutex_lock(&dev->lock_printer_io); |
25a010c8 CN |
572 | spin_lock_irqsave(&dev->lock, flags); |
573 | ||
574 | /* We will use this flag later to check if a printer reset happened | |
575 | * after we turn interrupts back on. | |
576 | */ | |
577 | dev->reset_printer = 0; | |
578 | ||
cc901bbb | 579 | setup_rx_reqs(dev); |
25a010c8 CN |
580 | |
581 | bytes_copied = 0; | |
582 | current_rx_req = dev->current_rx_req; | |
583 | current_rx_bytes = dev->current_rx_bytes; | |
584 | current_rx_buf = dev->current_rx_buf; | |
585 | dev->current_rx_req = NULL; | |
586 | dev->current_rx_bytes = 0; | |
587 | dev->current_rx_buf = NULL; | |
588 | ||
589 | /* Check if there is any data in the read buffers. Please note that | |
590 | * current_rx_bytes is the number of bytes in the current rx buffer. | |
591 | * If it is zero then check if there are any other rx_buffers that | |
592 | * are on the completed list. We are only out of data if all rx | |
593 | * buffers are empty. | |
594 | */ | |
595 | if ((current_rx_bytes == 0) && | |
596 | (likely(list_empty(&dev->rx_buffers)))) { | |
597 | /* Turn interrupts back on before sleeping. */ | |
598 | spin_unlock_irqrestore(&dev->lock, flags); | |
599 | ||
600 | /* | |
601 | * If no data is available check if this is a NON-Blocking | |
602 | * call or not. | |
603 | */ | |
604 | if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { | |
10ca4425 | 605 | mutex_unlock(&dev->lock_printer_io); |
25a010c8 CN |
606 | return -EAGAIN; |
607 | } | |
608 | ||
609 | /* Sleep until data is available */ | |
610 | wait_event_interruptible(dev->rx_wait, | |
611 | (likely(!list_empty(&dev->rx_buffers)))); | |
612 | spin_lock_irqsave(&dev->lock, flags); | |
613 | } | |
614 | ||
615 | /* We have data to return then copy it to the caller's buffer.*/ | |
616 | while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers))) | |
617 | && len) { | |
618 | if (current_rx_bytes == 0) { | |
619 | req = container_of(dev->rx_buffers.next, | |
620 | struct usb_request, list); | |
621 | list_del_init(&req->list); | |
622 | ||
623 | if (req->actual && req->buf) { | |
624 | current_rx_req = req; | |
625 | current_rx_bytes = req->actual; | |
626 | current_rx_buf = req->buf; | |
627 | } else { | |
628 | list_add(&req->list, &dev->rx_reqs); | |
629 | continue; | |
630 | } | |
631 | } | |
632 | ||
633 | /* Don't leave irqs off while doing memory copies */ | |
634 | spin_unlock_irqrestore(&dev->lock, flags); | |
635 | ||
636 | if (len > current_rx_bytes) | |
637 | size = current_rx_bytes; | |
638 | else | |
639 | size = len; | |
640 | ||
641 | size -= copy_to_user(buf, current_rx_buf, size); | |
642 | bytes_copied += size; | |
643 | len -= size; | |
644 | buf += size; | |
645 | ||
646 | spin_lock_irqsave(&dev->lock, flags); | |
647 | ||
cc901bbb | 648 | /* We've disconnected or reset so return. */ |
25a010c8 | 649 | if (dev->reset_printer) { |
cc901bbb | 650 | list_add(¤t_rx_req->list, &dev->rx_reqs); |
25a010c8 | 651 | spin_unlock_irqrestore(&dev->lock, flags); |
10ca4425 | 652 | mutex_unlock(&dev->lock_printer_io); |
25a010c8 CN |
653 | return -EAGAIN; |
654 | } | |
655 | ||
656 | /* If we not returning all the data left in this RX request | |
657 | * buffer then adjust the amount of data left in the buffer. | |
658 | * Othewise if we are done with this RX request buffer then | |
659 | * requeue it to get any incoming data from the USB host. | |
660 | */ | |
661 | if (size < current_rx_bytes) { | |
662 | current_rx_bytes -= size; | |
663 | current_rx_buf += size; | |
664 | } else { | |
665 | list_add(¤t_rx_req->list, &dev->rx_reqs); | |
666 | current_rx_bytes = 0; | |
667 | current_rx_buf = NULL; | |
668 | current_rx_req = NULL; | |
669 | } | |
670 | } | |
671 | ||
672 | dev->current_rx_req = current_rx_req; | |
673 | dev->current_rx_bytes = current_rx_bytes; | |
674 | dev->current_rx_buf = current_rx_buf; | |
675 | ||
676 | spin_unlock_irqrestore(&dev->lock, flags); | |
10ca4425 | 677 | mutex_unlock(&dev->lock_printer_io); |
25a010c8 CN |
678 | |
679 | DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied); | |
680 | ||
681 | if (bytes_copied) | |
682 | return bytes_copied; | |
683 | else | |
684 | return -EAGAIN; | |
685 | } | |
686 | ||
687 | static ssize_t | |
688 | printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr) | |
689 | { | |
690 | struct printer_dev *dev = fd->private_data; | |
691 | unsigned long flags; | |
692 | size_t size; /* Amount of data in a TX request. */ | |
693 | size_t bytes_copied = 0; | |
694 | struct usb_request *req; | |
695 | ||
696 | DBG(dev, "printer_write trying to send %d bytes\n", (int)len); | |
697 | ||
698 | if (len == 0) | |
699 | return -EINVAL; | |
700 | ||
10ca4425 | 701 | mutex_lock(&dev->lock_printer_io); |
25a010c8 CN |
702 | spin_lock_irqsave(&dev->lock, flags); |
703 | ||
704 | /* Check if a printer reset happens while we have interrupts on */ | |
705 | dev->reset_printer = 0; | |
706 | ||
707 | /* Check if there is any available write buffers */ | |
708 | if (likely(list_empty(&dev->tx_reqs))) { | |
709 | /* Turn interrupts back on before sleeping. */ | |
710 | spin_unlock_irqrestore(&dev->lock, flags); | |
711 | ||
712 | /* | |
713 | * If write buffers are available check if this is | |
714 | * a NON-Blocking call or not. | |
715 | */ | |
716 | if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { | |
10ca4425 | 717 | mutex_unlock(&dev->lock_printer_io); |
25a010c8 CN |
718 | return -EAGAIN; |
719 | } | |
720 | ||
721 | /* Sleep until a write buffer is available */ | |
722 | wait_event_interruptible(dev->tx_wait, | |
723 | (likely(!list_empty(&dev->tx_reqs)))); | |
724 | spin_lock_irqsave(&dev->lock, flags); | |
725 | } | |
726 | ||
727 | while (likely(!list_empty(&dev->tx_reqs)) && len) { | |
728 | ||
729 | if (len > USB_BUFSIZE) | |
730 | size = USB_BUFSIZE; | |
731 | else | |
732 | size = len; | |
733 | ||
734 | req = container_of(dev->tx_reqs.next, struct usb_request, | |
735 | list); | |
736 | list_del_init(&req->list); | |
737 | ||
738 | req->complete = tx_complete; | |
739 | req->length = size; | |
740 | ||
741 | /* Check if we need to send a zero length packet. */ | |
742 | if (len > size) | |
743 | /* They will be more TX requests so no yet. */ | |
744 | req->zero = 0; | |
745 | else | |
746 | /* If the data amount is not a multple of the | |
747 | * maxpacket size then send a zero length packet. | |
748 | */ | |
749 | req->zero = ((len % dev->in_ep->maxpacket) == 0); | |
750 | ||
751 | /* Don't leave irqs off while doing memory copies */ | |
752 | spin_unlock_irqrestore(&dev->lock, flags); | |
753 | ||
754 | if (copy_from_user(req->buf, buf, size)) { | |
755 | list_add(&req->list, &dev->tx_reqs); | |
10ca4425 | 756 | mutex_unlock(&dev->lock_printer_io); |
25a010c8 CN |
757 | return bytes_copied; |
758 | } | |
759 | ||
760 | bytes_copied += size; | |
761 | len -= size; | |
762 | buf += size; | |
763 | ||
764 | spin_lock_irqsave(&dev->lock, flags); | |
765 | ||
766 | /* We've disconnected or reset so free the req and buffer */ | |
767 | if (dev->reset_printer) { | |
cc901bbb | 768 | list_add(&req->list, &dev->tx_reqs); |
25a010c8 | 769 | spin_unlock_irqrestore(&dev->lock, flags); |
10ca4425 | 770 | mutex_unlock(&dev->lock_printer_io); |
25a010c8 CN |
771 | return -EAGAIN; |
772 | } | |
773 | ||
774 | if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) { | |
775 | list_add(&req->list, &dev->tx_reqs); | |
776 | spin_unlock_irqrestore(&dev->lock, flags); | |
10ca4425 | 777 | mutex_unlock(&dev->lock_printer_io); |
25a010c8 CN |
778 | return -EAGAIN; |
779 | } | |
780 | ||
781 | list_add(&req->list, &dev->tx_reqs_active); | |
782 | ||
783 | } | |
784 | ||
785 | spin_unlock_irqrestore(&dev->lock, flags); | |
10ca4425 | 786 | mutex_unlock(&dev->lock_printer_io); |
25a010c8 CN |
787 | |
788 | DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied); | |
789 | ||
790 | if (bytes_copied) { | |
791 | return bytes_copied; | |
792 | } else { | |
793 | return -EAGAIN; | |
794 | } | |
795 | } | |
796 | ||
797 | static int | |
7ea80859 | 798 | printer_fsync(struct file *fd, int datasync) |
25a010c8 CN |
799 | { |
800 | struct printer_dev *dev = fd->private_data; | |
801 | unsigned long flags; | |
802 | int tx_list_empty; | |
803 | ||
804 | spin_lock_irqsave(&dev->lock, flags); | |
805 | tx_list_empty = (likely(list_empty(&dev->tx_reqs))); | |
806 | spin_unlock_irqrestore(&dev->lock, flags); | |
807 | ||
808 | if (!tx_list_empty) { | |
809 | /* Sleep until all data has been sent */ | |
810 | wait_event_interruptible(dev->tx_flush_wait, | |
811 | (likely(list_empty(&dev->tx_reqs_active)))); | |
812 | } | |
813 | ||
814 | return 0; | |
815 | } | |
816 | ||
817 | static unsigned int | |
818 | printer_poll(struct file *fd, poll_table *wait) | |
819 | { | |
820 | struct printer_dev *dev = fd->private_data; | |
821 | unsigned long flags; | |
822 | int status = 0; | |
823 | ||
10ca4425 | 824 | mutex_lock(&dev->lock_printer_io); |
cc901bbb CN |
825 | spin_lock_irqsave(&dev->lock, flags); |
826 | setup_rx_reqs(dev); | |
827 | spin_unlock_irqrestore(&dev->lock, flags); | |
10ca4425 | 828 | mutex_unlock(&dev->lock_printer_io); |
cc901bbb | 829 | |
25a010c8 CN |
830 | poll_wait(fd, &dev->rx_wait, wait); |
831 | poll_wait(fd, &dev->tx_wait, wait); | |
832 | ||
833 | spin_lock_irqsave(&dev->lock, flags); | |
834 | if (likely(!list_empty(&dev->tx_reqs))) | |
835 | status |= POLLOUT | POLLWRNORM; | |
836 | ||
cc901bbb CN |
837 | if (likely(dev->current_rx_bytes) || |
838 | likely(!list_empty(&dev->rx_buffers))) | |
25a010c8 CN |
839 | status |= POLLIN | POLLRDNORM; |
840 | ||
841 | spin_unlock_irqrestore(&dev->lock, flags); | |
842 | ||
843 | return status; | |
844 | } | |
845 | ||
44c389a0 AC |
846 | static long |
847 | printer_ioctl(struct file *fd, unsigned int code, unsigned long arg) | |
25a010c8 CN |
848 | { |
849 | struct printer_dev *dev = fd->private_data; | |
850 | unsigned long flags; | |
851 | int status = 0; | |
852 | ||
853 | DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg); | |
854 | ||
855 | /* handle ioctls */ | |
856 | ||
857 | spin_lock_irqsave(&dev->lock, flags); | |
858 | ||
859 | switch (code) { | |
860 | case GADGET_GET_PRINTER_STATUS: | |
861 | status = (int)dev->printer_status; | |
862 | break; | |
863 | case GADGET_SET_PRINTER_STATUS: | |
864 | dev->printer_status = (u8)arg; | |
865 | break; | |
866 | default: | |
867 | /* could not handle ioctl */ | |
868 | DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n", | |
869 | code); | |
870 | status = -ENOTTY; | |
871 | } | |
872 | ||
873 | spin_unlock_irqrestore(&dev->lock, flags); | |
874 | ||
875 | return status; | |
876 | } | |
877 | ||
878 | /* used after endpoint configuration */ | |
828c0950 | 879 | static const struct file_operations printer_io_operations = { |
25a010c8 CN |
880 | .owner = THIS_MODULE, |
881 | .open = printer_open, | |
882 | .read = printer_read, | |
883 | .write = printer_write, | |
884 | .fsync = printer_fsync, | |
885 | .poll = printer_poll, | |
44c389a0 | 886 | .unlocked_ioctl = printer_ioctl, |
6038f373 AB |
887 | .release = printer_close, |
888 | .llseek = noop_llseek, | |
25a010c8 CN |
889 | }; |
890 | ||
891 | /*-------------------------------------------------------------------------*/ | |
892 | ||
893 | static int | |
894 | set_printer_interface(struct printer_dev *dev) | |
895 | { | |
896 | int result = 0; | |
897 | ||
898 | dev->in = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc); | |
899 | dev->in_ep->driver_data = dev; | |
900 | ||
901 | dev->out = ep_desc(dev->gadget, &hs_ep_out_desc, &fs_ep_out_desc); | |
902 | dev->out_ep->driver_data = dev; | |
903 | ||
904 | result = usb_ep_enable(dev->in_ep, dev->in); | |
905 | if (result != 0) { | |
906 | DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result); | |
907 | goto done; | |
908 | } | |
909 | ||
910 | result = usb_ep_enable(dev->out_ep, dev->out); | |
911 | if (result != 0) { | |
912 | DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result); | |
913 | goto done; | |
914 | } | |
915 | ||
916 | done: | |
917 | /* on error, disable any endpoints */ | |
918 | if (result != 0) { | |
919 | (void) usb_ep_disable(dev->in_ep); | |
920 | (void) usb_ep_disable(dev->out_ep); | |
921 | dev->in = NULL; | |
922 | dev->out = NULL; | |
923 | } | |
924 | ||
925 | /* caller is responsible for cleanup on error */ | |
926 | return result; | |
927 | } | |
928 | ||
929 | static void printer_reset_interface(struct printer_dev *dev) | |
930 | { | |
931 | if (dev->interface < 0) | |
932 | return; | |
933 | ||
441b62c1 | 934 | DBG(dev, "%s\n", __func__); |
25a010c8 CN |
935 | |
936 | if (dev->in) | |
937 | usb_ep_disable(dev->in_ep); | |
938 | ||
939 | if (dev->out) | |
940 | usb_ep_disable(dev->out_ep); | |
941 | ||
942 | dev->interface = -1; | |
943 | } | |
944 | ||
945 | /* change our operational config. must agree with the code | |
946 | * that returns config descriptors, and altsetting code. | |
947 | */ | |
948 | static int | |
949 | printer_set_config(struct printer_dev *dev, unsigned number) | |
950 | { | |
951 | int result = 0; | |
952 | struct usb_gadget *gadget = dev->gadget; | |
953 | ||
25a010c8 CN |
954 | switch (number) { |
955 | case DEV_CONFIG_VALUE: | |
956 | result = 0; | |
957 | break; | |
958 | default: | |
959 | result = -EINVAL; | |
960 | /* FALL THROUGH */ | |
961 | case 0: | |
962 | break; | |
963 | } | |
964 | ||
965 | if (result) { | |
966 | usb_gadget_vbus_draw(dev->gadget, | |
967 | dev->gadget->is_otg ? 8 : 100); | |
968 | } else { | |
969 | char *speed; | |
970 | unsigned power; | |
971 | ||
972 | power = 2 * config_desc.bMaxPower; | |
973 | usb_gadget_vbus_draw(dev->gadget, power); | |
974 | ||
975 | switch (gadget->speed) { | |
976 | case USB_SPEED_FULL: speed = "full"; break; | |
977 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
978 | case USB_SPEED_HIGH: speed = "high"; break; | |
979 | #endif | |
980 | default: speed = "?"; break; | |
981 | } | |
982 | ||
983 | dev->config = number; | |
984 | INFO(dev, "%s speed config #%d: %d mA, %s\n", | |
985 | speed, number, power, driver_desc); | |
986 | } | |
987 | return result; | |
988 | } | |
989 | ||
990 | static int | |
991 | config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index, | |
992 | int is_otg) | |
993 | { | |
994 | int len; | |
995 | const struct usb_descriptor_header **function; | |
996 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
997 | int hs = (speed == USB_SPEED_HIGH); | |
998 | ||
999 | if (type == USB_DT_OTHER_SPEED_CONFIG) | |
1000 | hs = !hs; | |
1001 | ||
1002 | if (hs) { | |
1003 | function = hs_printer_function; | |
1004 | } else { | |
1005 | function = fs_printer_function; | |
1006 | } | |
1007 | #else | |
1008 | function = fs_printer_function; | |
1009 | #endif | |
1010 | ||
1011 | if (index >= device_desc.bNumConfigurations) | |
1012 | return -EINVAL; | |
1013 | ||
1014 | /* for now, don't advertise srp-only devices */ | |
1015 | if (!is_otg) | |
1016 | function++; | |
1017 | ||
1018 | len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE, | |
1019 | function); | |
1020 | if (len < 0) | |
1021 | return len; | |
1022 | ((struct usb_config_descriptor *) buf)->bDescriptorType = type; | |
1023 | return len; | |
1024 | } | |
1025 | ||
1026 | /* Change our operational Interface. */ | |
1027 | static int | |
1028 | set_interface(struct printer_dev *dev, unsigned number) | |
1029 | { | |
1030 | int result = 0; | |
1031 | ||
25a010c8 CN |
1032 | /* Free the current interface */ |
1033 | switch (dev->interface) { | |
1034 | case PRINTER_INTERFACE: | |
1035 | printer_reset_interface(dev); | |
1036 | break; | |
1037 | } | |
1038 | ||
1039 | switch (number) { | |
1040 | case PRINTER_INTERFACE: | |
1041 | result = set_printer_interface(dev); | |
1042 | if (result) { | |
1043 | printer_reset_interface(dev); | |
1044 | } else { | |
1045 | dev->interface = PRINTER_INTERFACE; | |
1046 | } | |
1047 | break; | |
1048 | default: | |
1049 | result = -EINVAL; | |
1050 | /* FALL THROUGH */ | |
1051 | } | |
1052 | ||
1053 | if (!result) | |
1054 | INFO(dev, "Using interface %x\n", number); | |
1055 | ||
1056 | return result; | |
1057 | } | |
1058 | ||
1059 | static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req) | |
1060 | { | |
1061 | if (req->status || req->actual != req->length) | |
1062 | DBG((struct printer_dev *) ep->driver_data, | |
1063 | "setup complete --> %d, %d/%d\n", | |
1064 | req->status, req->actual, req->length); | |
1065 | } | |
1066 | ||
1067 | static void printer_soft_reset(struct printer_dev *dev) | |
1068 | { | |
1069 | struct usb_request *req; | |
1070 | ||
1071 | INFO(dev, "Received Printer Reset Request\n"); | |
1072 | ||
1073 | if (usb_ep_disable(dev->in_ep)) | |
1074 | DBG(dev, "Failed to disable USB in_ep\n"); | |
1075 | if (usb_ep_disable(dev->out_ep)) | |
1076 | DBG(dev, "Failed to disable USB out_ep\n"); | |
1077 | ||
1078 | if (dev->current_rx_req != NULL) { | |
1079 | list_add(&dev->current_rx_req->list, &dev->rx_reqs); | |
1080 | dev->current_rx_req = NULL; | |
1081 | } | |
1082 | dev->current_rx_bytes = 0; | |
1083 | dev->current_rx_buf = NULL; | |
1084 | dev->reset_printer = 1; | |
1085 | ||
1086 | while (likely(!(list_empty(&dev->rx_buffers)))) { | |
1087 | req = container_of(dev->rx_buffers.next, struct usb_request, | |
1088 | list); | |
1089 | list_del_init(&req->list); | |
1090 | list_add(&req->list, &dev->rx_reqs); | |
1091 | } | |
1092 | ||
1093 | while (likely(!(list_empty(&dev->rx_reqs_active)))) { | |
1094 | req = container_of(dev->rx_buffers.next, struct usb_request, | |
1095 | list); | |
1096 | list_del_init(&req->list); | |
1097 | list_add(&req->list, &dev->rx_reqs); | |
1098 | } | |
1099 | ||
1100 | while (likely(!(list_empty(&dev->tx_reqs_active)))) { | |
1101 | req = container_of(dev->tx_reqs_active.next, | |
1102 | struct usb_request, list); | |
1103 | list_del_init(&req->list); | |
1104 | list_add(&req->list, &dev->tx_reqs); | |
1105 | } | |
1106 | ||
1107 | if (usb_ep_enable(dev->in_ep, dev->in)) | |
1108 | DBG(dev, "Failed to enable USB in_ep\n"); | |
1109 | if (usb_ep_enable(dev->out_ep, dev->out)) | |
1110 | DBG(dev, "Failed to enable USB out_ep\n"); | |
1111 | ||
cc901bbb | 1112 | wake_up_interruptible(&dev->rx_wait); |
25a010c8 CN |
1113 | wake_up_interruptible(&dev->tx_wait); |
1114 | wake_up_interruptible(&dev->tx_flush_wait); | |
1115 | } | |
1116 | ||
1117 | /*-------------------------------------------------------------------------*/ | |
1118 | ||
1119 | /* | |
1120 | * The setup() callback implements all the ep0 functionality that's not | |
1121 | * handled lower down. | |
1122 | */ | |
1123 | static int | |
1124 | printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) | |
1125 | { | |
1126 | struct printer_dev *dev = get_gadget_data(gadget); | |
1127 | struct usb_request *req = dev->req; | |
1128 | int value = -EOPNOTSUPP; | |
1129 | u16 wIndex = le16_to_cpu(ctrl->wIndex); | |
1130 | u16 wValue = le16_to_cpu(ctrl->wValue); | |
1131 | u16 wLength = le16_to_cpu(ctrl->wLength); | |
1132 | ||
1133 | DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n", | |
1134 | ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength); | |
1135 | ||
1136 | req->complete = printer_setup_complete; | |
1137 | ||
1138 | switch (ctrl->bRequestType&USB_TYPE_MASK) { | |
1139 | ||
1140 | case USB_TYPE_STANDARD: | |
1141 | switch (ctrl->bRequest) { | |
1142 | ||
1143 | case USB_REQ_GET_DESCRIPTOR: | |
1144 | if (ctrl->bRequestType != USB_DIR_IN) | |
1145 | break; | |
1146 | switch (wValue >> 8) { | |
1147 | ||
1148 | case USB_DT_DEVICE: | |
1149 | value = min(wLength, (u16) sizeof device_desc); | |
1150 | memcpy(req->buf, &device_desc, value); | |
1151 | break; | |
1152 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
1153 | case USB_DT_DEVICE_QUALIFIER: | |
1154 | if (!gadget->is_dualspeed) | |
1155 | break; | |
1156 | value = min(wLength, | |
1157 | (u16) sizeof dev_qualifier); | |
1158 | memcpy(req->buf, &dev_qualifier, value); | |
1159 | break; | |
1160 | ||
1161 | case USB_DT_OTHER_SPEED_CONFIG: | |
1162 | if (!gadget->is_dualspeed) | |
1163 | break; | |
1164 | /* FALLTHROUGH */ | |
1165 | #endif /* CONFIG_USB_GADGET_DUALSPEED */ | |
1166 | case USB_DT_CONFIG: | |
1167 | value = config_buf(gadget->speed, req->buf, | |
1168 | wValue >> 8, | |
1169 | wValue & 0xff, | |
1170 | gadget->is_otg); | |
1171 | if (value >= 0) | |
1172 | value = min(wLength, (u16) value); | |
1173 | break; | |
1174 | ||
1175 | case USB_DT_STRING: | |
1176 | value = usb_gadget_get_string(&stringtab, | |
1177 | wValue & 0xff, req->buf); | |
1178 | if (value >= 0) | |
1179 | value = min(wLength, (u16) value); | |
1180 | break; | |
1181 | } | |
1182 | break; | |
1183 | ||
1184 | case USB_REQ_SET_CONFIGURATION: | |
1185 | if (ctrl->bRequestType != 0) | |
1186 | break; | |
1187 | if (gadget->a_hnp_support) | |
1188 | DBG(dev, "HNP available\n"); | |
1189 | else if (gadget->a_alt_hnp_support) | |
1190 | DBG(dev, "HNP needs a different root port\n"); | |
1191 | value = printer_set_config(dev, wValue); | |
1192 | break; | |
1193 | case USB_REQ_GET_CONFIGURATION: | |
1194 | if (ctrl->bRequestType != USB_DIR_IN) | |
1195 | break; | |
1196 | *(u8 *)req->buf = dev->config; | |
1197 | value = min(wLength, (u16) 1); | |
1198 | break; | |
1199 | ||
1200 | case USB_REQ_SET_INTERFACE: | |
1201 | if (ctrl->bRequestType != USB_RECIP_INTERFACE || | |
1202 | !dev->config) | |
1203 | break; | |
1204 | ||
1205 | value = set_interface(dev, PRINTER_INTERFACE); | |
1206 | break; | |
1207 | case USB_REQ_GET_INTERFACE: | |
1208 | if (ctrl->bRequestType != | |
1209 | (USB_DIR_IN|USB_RECIP_INTERFACE) | |
1210 | || !dev->config) | |
1211 | break; | |
1212 | ||
1213 | *(u8 *)req->buf = dev->interface; | |
1214 | value = min(wLength, (u16) 1); | |
1215 | break; | |
1216 | ||
1217 | default: | |
1218 | goto unknown; | |
1219 | } | |
1220 | break; | |
1221 | ||
1222 | case USB_TYPE_CLASS: | |
1223 | switch (ctrl->bRequest) { | |
1224 | case 0: /* Get the IEEE-1284 PNP String */ | |
1225 | /* Only one printer interface is supported. */ | |
1226 | if ((wIndex>>8) != PRINTER_INTERFACE) | |
1227 | break; | |
1228 | ||
1229 | value = (pnp_string[0]<<8)|pnp_string[1]; | |
1230 | memcpy(req->buf, pnp_string, value); | |
1231 | DBG(dev, "1284 PNP String: %x %s\n", value, | |
1232 | &pnp_string[2]); | |
1233 | break; | |
1234 | ||
1235 | case 1: /* Get Port Status */ | |
1236 | /* Only one printer interface is supported. */ | |
1237 | if (wIndex != PRINTER_INTERFACE) | |
1238 | break; | |
1239 | ||
1240 | *(u8 *)req->buf = dev->printer_status; | |
1241 | value = min(wLength, (u16) 1); | |
1242 | break; | |
1243 | ||
1244 | case 2: /* Soft Reset */ | |
1245 | /* Only one printer interface is supported. */ | |
1246 | if (wIndex != PRINTER_INTERFACE) | |
1247 | break; | |
1248 | ||
1249 | printer_soft_reset(dev); | |
1250 | ||
1251 | value = 0; | |
1252 | break; | |
1253 | ||
1254 | default: | |
1255 | goto unknown; | |
1256 | } | |
1257 | break; | |
1258 | ||
1259 | default: | |
1260 | unknown: | |
1261 | VDBG(dev, | |
1262 | "unknown ctrl req%02x.%02x v%04x i%04x l%d\n", | |
1263 | ctrl->bRequestType, ctrl->bRequest, | |
1264 | wValue, wIndex, wLength); | |
1265 | break; | |
1266 | } | |
1267 | ||
1268 | /* respond with data transfer before status phase? */ | |
1269 | if (value >= 0) { | |
1270 | req->length = value; | |
8296345a | 1271 | req->zero = value < wLength; |
25a010c8 CN |
1272 | value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); |
1273 | if (value < 0) { | |
1274 | DBG(dev, "ep_queue --> %d\n", value); | |
1275 | req->status = 0; | |
1276 | printer_setup_complete(gadget->ep0, req); | |
1277 | } | |
1278 | } | |
1279 | ||
1280 | /* host either stalls (value < 0) or reports success */ | |
1281 | return value; | |
1282 | } | |
1283 | ||
1284 | static void | |
1285 | printer_disconnect(struct usb_gadget *gadget) | |
1286 | { | |
1287 | struct printer_dev *dev = get_gadget_data(gadget); | |
1288 | unsigned long flags; | |
1289 | ||
441b62c1 | 1290 | DBG(dev, "%s\n", __func__); |
25a010c8 CN |
1291 | |
1292 | spin_lock_irqsave(&dev->lock, flags); | |
1293 | ||
1294 | printer_reset_interface(dev); | |
1295 | ||
1296 | spin_unlock_irqrestore(&dev->lock, flags); | |
1297 | } | |
1298 | ||
1299 | static void | |
1300 | printer_unbind(struct usb_gadget *gadget) | |
1301 | { | |
1302 | struct printer_dev *dev = get_gadget_data(gadget); | |
1303 | struct usb_request *req; | |
1304 | ||
1305 | ||
441b62c1 | 1306 | DBG(dev, "%s\n", __func__); |
25a010c8 CN |
1307 | |
1308 | /* Remove sysfs files */ | |
1309 | device_destroy(usb_gadget_class, g_printer_devno); | |
1310 | ||
1311 | /* Remove Character Device */ | |
1312 | cdev_del(&dev->printer_cdev); | |
1313 | ||
1314 | /* we must already have been disconnected ... no i/o may be active */ | |
1315 | WARN_ON(!list_empty(&dev->tx_reqs_active)); | |
1316 | WARN_ON(!list_empty(&dev->rx_reqs_active)); | |
1317 | ||
1318 | /* Free all memory for this driver. */ | |
1319 | while (!list_empty(&dev->tx_reqs)) { | |
1320 | req = container_of(dev->tx_reqs.next, struct usb_request, | |
1321 | list); | |
1322 | list_del(&req->list); | |
1323 | printer_req_free(dev->in_ep, req); | |
1324 | } | |
1325 | ||
efa66f14 | 1326 | if (dev->current_rx_req != NULL) |
25a010c8 CN |
1327 | printer_req_free(dev->out_ep, dev->current_rx_req); |
1328 | ||
1329 | while (!list_empty(&dev->rx_reqs)) { | |
1330 | req = container_of(dev->rx_reqs.next, | |
1331 | struct usb_request, list); | |
1332 | list_del(&req->list); | |
1333 | printer_req_free(dev->out_ep, req); | |
1334 | } | |
1335 | ||
1336 | while (!list_empty(&dev->rx_buffers)) { | |
1337 | req = container_of(dev->rx_buffers.next, | |
1338 | struct usb_request, list); | |
1339 | list_del(&req->list); | |
1340 | printer_req_free(dev->out_ep, req); | |
1341 | } | |
1342 | ||
1343 | if (dev->req) { | |
1344 | printer_req_free(gadget->ep0, dev->req); | |
1345 | dev->req = NULL; | |
1346 | } | |
1347 | ||
1348 | set_gadget_data(gadget, NULL); | |
1349 | } | |
1350 | ||
89ba85d4 | 1351 | static int __ref |
25a010c8 CN |
1352 | printer_bind(struct usb_gadget *gadget) |
1353 | { | |
1354 | struct printer_dev *dev; | |
1355 | struct usb_ep *in_ep, *out_ep; | |
1356 | int status = -ENOMEM; | |
1357 | int gcnum; | |
1358 | size_t len; | |
1359 | u32 i; | |
1360 | struct usb_request *req; | |
1361 | ||
1362 | dev = &usb_printer_gadget; | |
1363 | ||
1364 | ||
1365 | /* Setup the sysfs files for the printer gadget. */ | |
b0b090e5 GKH |
1366 | dev->pdev = device_create(usb_gadget_class, NULL, g_printer_devno, |
1367 | NULL, "g_printer"); | |
25a010c8 CN |
1368 | if (IS_ERR(dev->pdev)) { |
1369 | ERROR(dev, "Failed to create device: g_printer\n"); | |
1370 | goto fail; | |
1371 | } | |
1372 | ||
1373 | /* | |
1374 | * Register a character device as an interface to a user mode | |
1375 | * program that handles the printer specific functionality. | |
1376 | */ | |
1377 | cdev_init(&dev->printer_cdev, &printer_io_operations); | |
1378 | dev->printer_cdev.owner = THIS_MODULE; | |
1379 | status = cdev_add(&dev->printer_cdev, g_printer_devno, 1); | |
1380 | if (status) { | |
1381 | ERROR(dev, "Failed to open char device\n"); | |
1382 | goto fail; | |
1383 | } | |
1384 | ||
25a010c8 CN |
1385 | gcnum = usb_gadget_controller_number(gadget); |
1386 | if (gcnum >= 0) { | |
1387 | device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum); | |
1388 | } else { | |
1389 | dev_warn(&gadget->dev, "controller '%s' not recognized\n", | |
1390 | gadget->name); | |
1391 | /* unrecognized, but safe unless bulk is REALLY quirky */ | |
1392 | device_desc.bcdDevice = | |
551509d2 | 1393 | cpu_to_le16(0xFFFF); |
25a010c8 CN |
1394 | } |
1395 | snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s", | |
1396 | init_utsname()->sysname, init_utsname()->release, | |
1397 | gadget->name); | |
1398 | ||
1399 | device_desc.idVendor = | |
551509d2 | 1400 | cpu_to_le16(PRINTER_VENDOR_NUM); |
25a010c8 | 1401 | device_desc.idProduct = |
551509d2 | 1402 | cpu_to_le16(PRINTER_PRODUCT_NUM); |
25a010c8 CN |
1403 | |
1404 | /* support optional vendor/distro customization */ | |
1405 | if (idVendor) { | |
1406 | if (!idProduct) { | |
1407 | dev_err(&gadget->dev, "idVendor needs idProduct!\n"); | |
1408 | return -ENODEV; | |
1409 | } | |
1410 | device_desc.idVendor = cpu_to_le16(idVendor); | |
1411 | device_desc.idProduct = cpu_to_le16(idProduct); | |
1412 | if (bcdDevice) | |
1413 | device_desc.bcdDevice = cpu_to_le16(bcdDevice); | |
1414 | } | |
1415 | ||
1416 | if (iManufacturer) | |
1417 | strlcpy(manufacturer, iManufacturer, sizeof manufacturer); | |
1418 | ||
1419 | if (iProduct) | |
1420 | strlcpy(product_desc, iProduct, sizeof product_desc); | |
1421 | ||
1422 | if (iSerialNum) | |
1423 | strlcpy(serial_num, iSerialNum, sizeof serial_num); | |
1424 | ||
1425 | if (iPNPstring) | |
1426 | strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2); | |
1427 | ||
1428 | len = strlen(pnp_string); | |
1429 | pnp_string[0] = (len >> 8) & 0xFF; | |
1430 | pnp_string[1] = len & 0xFF; | |
1431 | ||
1432 | /* all we really need is bulk IN/OUT */ | |
1433 | usb_ep_autoconfig_reset(gadget); | |
1434 | in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc); | |
1435 | if (!in_ep) { | |
1436 | autoconf_fail: | |
1437 | dev_err(&gadget->dev, "can't autoconfigure on %s\n", | |
1438 | gadget->name); | |
1439 | return -ENODEV; | |
1440 | } | |
1441 | in_ep->driver_data = in_ep; /* claim */ | |
1442 | ||
1443 | out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc); | |
1444 | if (!out_ep) | |
1445 | goto autoconf_fail; | |
1446 | out_ep->driver_data = out_ep; /* claim */ | |
1447 | ||
1448 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
1449 | /* assumes ep0 uses the same value for both speeds ... */ | |
1450 | dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0; | |
1451 | ||
1452 | /* and that all endpoints are dual-speed */ | |
1453 | hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress; | |
1454 | hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress; | |
1455 | #endif /* DUALSPEED */ | |
1456 | ||
1457 | device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket; | |
1458 | usb_gadget_set_selfpowered(gadget); | |
1459 | ||
1460 | if (gadget->is_otg) { | |
1461 | otg_desc.bmAttributes |= USB_OTG_HNP, | |
1462 | config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP; | |
25a010c8 CN |
1463 | } |
1464 | ||
1465 | spin_lock_init(&dev->lock); | |
10ca4425 | 1466 | mutex_init(&dev->lock_printer_io); |
25a010c8 CN |
1467 | INIT_LIST_HEAD(&dev->tx_reqs); |
1468 | INIT_LIST_HEAD(&dev->tx_reqs_active); | |
1469 | INIT_LIST_HEAD(&dev->rx_reqs); | |
1470 | INIT_LIST_HEAD(&dev->rx_reqs_active); | |
1471 | INIT_LIST_HEAD(&dev->rx_buffers); | |
1472 | init_waitqueue_head(&dev->rx_wait); | |
1473 | init_waitqueue_head(&dev->tx_wait); | |
1474 | init_waitqueue_head(&dev->tx_flush_wait); | |
1475 | ||
1476 | dev->config = 0; | |
1477 | dev->interface = -1; | |
1478 | dev->printer_cdev_open = 0; | |
1479 | dev->printer_status = PRINTER_NOT_ERROR; | |
1480 | dev->current_rx_req = NULL; | |
1481 | dev->current_rx_bytes = 0; | |
1482 | dev->current_rx_buf = NULL; | |
1483 | ||
1484 | dev->in_ep = in_ep; | |
1485 | dev->out_ep = out_ep; | |
1486 | ||
1487 | /* preallocate control message data and buffer */ | |
1488 | dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE, | |
1489 | GFP_KERNEL); | |
1490 | if (!dev->req) { | |
1491 | status = -ENOMEM; | |
1492 | goto fail; | |
1493 | } | |
1494 | ||
1495 | for (i = 0; i < QLEN; i++) { | |
1496 | req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL); | |
1497 | if (!req) { | |
1498 | while (!list_empty(&dev->tx_reqs)) { | |
1499 | req = container_of(dev->tx_reqs.next, | |
1500 | struct usb_request, list); | |
1501 | list_del(&req->list); | |
1502 | printer_req_free(dev->in_ep, req); | |
1503 | } | |
1504 | return -ENOMEM; | |
1505 | } | |
1506 | list_add(&req->list, &dev->tx_reqs); | |
1507 | } | |
1508 | ||
1509 | for (i = 0; i < QLEN; i++) { | |
1510 | req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL); | |
1511 | if (!req) { | |
1512 | while (!list_empty(&dev->rx_reqs)) { | |
1513 | req = container_of(dev->rx_reqs.next, | |
1514 | struct usb_request, list); | |
1515 | list_del(&req->list); | |
1516 | printer_req_free(dev->out_ep, req); | |
1517 | } | |
1518 | return -ENOMEM; | |
1519 | } | |
1520 | list_add(&req->list, &dev->rx_reqs); | |
1521 | } | |
1522 | ||
1523 | dev->req->complete = printer_setup_complete; | |
1524 | ||
1525 | /* finish hookup to lower layer ... */ | |
1526 | dev->gadget = gadget; | |
1527 | set_gadget_data(gadget, dev); | |
1528 | gadget->ep0->driver_data = dev; | |
1529 | ||
1530 | INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc); | |
1531 | INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name, | |
1532 | in_ep->name); | |
1533 | ||
1534 | return 0; | |
1535 | ||
1536 | fail: | |
1537 | printer_unbind(gadget); | |
1538 | return status; | |
1539 | } | |
1540 | ||
1541 | /*-------------------------------------------------------------------------*/ | |
1542 | ||
1543 | static struct usb_gadget_driver printer_driver = { | |
1544 | .speed = DEVSPEED, | |
1545 | ||
1546 | .function = (char *) driver_desc, | |
1547 | .bind = printer_bind, | |
1548 | .unbind = printer_unbind, | |
1549 | ||
1550 | .setup = printer_setup, | |
1551 | .disconnect = printer_disconnect, | |
1552 | ||
1553 | .driver = { | |
1554 | .name = (char *) shortname, | |
1555 | .owner = THIS_MODULE, | |
1556 | }, | |
1557 | }; | |
1558 | ||
1559 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1560 | MODULE_AUTHOR("Craig Nadler"); | |
1561 | MODULE_LICENSE("GPL"); | |
1562 | ||
1563 | static int __init | |
1564 | init(void) | |
1565 | { | |
1566 | int status; | |
1567 | ||
1568 | usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget"); | |
1569 | if (IS_ERR(usb_gadget_class)) { | |
1570 | status = PTR_ERR(usb_gadget_class); | |
1571 | ERROR(dev, "unable to create usb_gadget class %d\n", status); | |
1572 | return status; | |
1573 | } | |
1574 | ||
1575 | status = alloc_chrdev_region(&g_printer_devno, 0, 1, | |
1576 | "USB printer gadget"); | |
1577 | if (status) { | |
1578 | ERROR(dev, "alloc_chrdev_region %d\n", status); | |
1579 | class_destroy(usb_gadget_class); | |
1580 | return status; | |
1581 | } | |
1582 | ||
1583 | status = usb_gadget_register_driver(&printer_driver); | |
1584 | if (status) { | |
1585 | class_destroy(usb_gadget_class); | |
1586 | unregister_chrdev_region(g_printer_devno, 1); | |
1587 | DBG(dev, "usb_gadget_register_driver %x\n", status); | |
1588 | } | |
1589 | ||
1590 | return status; | |
1591 | } | |
1592 | module_init(init); | |
1593 | ||
1594 | static void __exit | |
1595 | cleanup(void) | |
1596 | { | |
1597 | int status; | |
1598 | ||
10ca4425 | 1599 | mutex_lock(&usb_printer_gadget.lock_printer_io); |
25a010c8 CN |
1600 | class_destroy(usb_gadget_class); |
1601 | unregister_chrdev_region(g_printer_devno, 2); | |
1602 | ||
1603 | status = usb_gadget_unregister_driver(&printer_driver); | |
1604 | if (status) | |
1605 | ERROR(dev, "usb_gadget_unregister_driver %x\n", status); | |
1606 | ||
10ca4425 | 1607 | mutex_unlock(&usb_printer_gadget.lock_printer_io); |
25a010c8 CN |
1608 | } |
1609 | module_exit(cleanup); |