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Merge tag 'phy-for-4.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon...
[deliverable/linux.git] / drivers / usb / gadget / function / f_printer.c
1 /*
2 * f_printer.c - USB printer function driver
3 *
4 * Copied from drivers/usb/gadget/legacy/printer.c,
5 * which was:
6 *
7 * printer.c -- Printer gadget driver
8 *
9 * Copyright (C) 2003-2005 David Brownell
10 * Copyright (C) 2006 Craig W. Nadler
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 */
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/delay.h>
21 #include <linux/ioport.h>
22 #include <linux/sched.h>
23 #include <linux/slab.h>
24 #include <linux/mutex.h>
25 #include <linux/errno.h>
26 #include <linux/init.h>
27 #include <linux/idr.h>
28 #include <linux/timer.h>
29 #include <linux/list.h>
30 #include <linux/interrupt.h>
31 #include <linux/device.h>
32 #include <linux/moduleparam.h>
33 #include <linux/fs.h>
34 #include <linux/poll.h>
35 #include <linux/types.h>
36 #include <linux/ctype.h>
37 #include <linux/cdev.h>
38
39 #include <asm/byteorder.h>
40 #include <linux/io.h>
41 #include <linux/irq.h>
42 #include <linux/uaccess.h>
43 #include <asm/unaligned.h>
44
45 #include <linux/usb/ch9.h>
46 #include <linux/usb/composite.h>
47 #include <linux/usb/gadget.h>
48 #include <linux/usb/g_printer.h>
49
50 #include "u_printer.h"
51
52 #define PNP_STRING_LEN 1024
53 #define PRINTER_MINORS 4
54 #define GET_DEVICE_ID 0
55 #define GET_PORT_STATUS 1
56 #define SOFT_RESET 2
57
58 static int major, minors;
59 static struct class *usb_gadget_class;
60 static DEFINE_IDA(printer_ida);
61 static DEFINE_MUTEX(printer_ida_lock); /* protects access do printer_ida */
62
63 /*-------------------------------------------------------------------------*/
64
65 struct printer_dev {
66 spinlock_t lock; /* lock this structure */
67 /* lock buffer lists during read/write calls */
68 struct mutex lock_printer_io;
69 struct usb_gadget *gadget;
70 s8 interface;
71 struct usb_ep *in_ep, *out_ep;
72
73 struct list_head rx_reqs; /* List of free RX structs */
74 struct list_head rx_reqs_active; /* List of Active RX xfers */
75 struct list_head rx_buffers; /* List of completed xfers */
76 /* wait until there is data to be read. */
77 wait_queue_head_t rx_wait;
78 struct list_head tx_reqs; /* List of free TX structs */
79 struct list_head tx_reqs_active; /* List of Active TX xfers */
80 /* Wait until there are write buffers available to use. */
81 wait_queue_head_t tx_wait;
82 /* Wait until all write buffers have been sent. */
83 wait_queue_head_t tx_flush_wait;
84 struct usb_request *current_rx_req;
85 size_t current_rx_bytes;
86 u8 *current_rx_buf;
87 u8 printer_status;
88 u8 reset_printer;
89 int minor;
90 struct cdev printer_cdev;
91 u8 printer_cdev_open;
92 wait_queue_head_t wait;
93 unsigned q_len;
94 char *pnp_string; /* We don't own memory! */
95 struct usb_function function;
96 };
97
98 static inline struct printer_dev *func_to_printer(struct usb_function *f)
99 {
100 return container_of(f, struct printer_dev, function);
101 }
102
103 /*-------------------------------------------------------------------------*/
104
105 /*
106 * DESCRIPTORS ... most are static, but strings and (full) configuration
107 * descriptors are built on demand.
108 */
109
110 /* holds our biggest descriptor */
111 #define USB_DESC_BUFSIZE 256
112 #define USB_BUFSIZE 8192
113
114 static struct usb_interface_descriptor intf_desc = {
115 .bLength = sizeof(intf_desc),
116 .bDescriptorType = USB_DT_INTERFACE,
117 .bNumEndpoints = 2,
118 .bInterfaceClass = USB_CLASS_PRINTER,
119 .bInterfaceSubClass = 1, /* Printer Sub-Class */
120 .bInterfaceProtocol = 2, /* Bi-Directional */
121 .iInterface = 0
122 };
123
124 static struct usb_endpoint_descriptor fs_ep_in_desc = {
125 .bLength = USB_DT_ENDPOINT_SIZE,
126 .bDescriptorType = USB_DT_ENDPOINT,
127 .bEndpointAddress = USB_DIR_IN,
128 .bmAttributes = USB_ENDPOINT_XFER_BULK
129 };
130
131 static struct usb_endpoint_descriptor fs_ep_out_desc = {
132 .bLength = USB_DT_ENDPOINT_SIZE,
133 .bDescriptorType = USB_DT_ENDPOINT,
134 .bEndpointAddress = USB_DIR_OUT,
135 .bmAttributes = USB_ENDPOINT_XFER_BULK
136 };
137
138 static struct usb_descriptor_header *fs_printer_function[] = {
139 (struct usb_descriptor_header *) &intf_desc,
140 (struct usb_descriptor_header *) &fs_ep_in_desc,
141 (struct usb_descriptor_header *) &fs_ep_out_desc,
142 NULL
143 };
144
145 /*
146 * usb 2.0 devices need to expose both high speed and full speed
147 * descriptors, unless they only run at full speed.
148 */
149
150 static struct usb_endpoint_descriptor hs_ep_in_desc = {
151 .bLength = USB_DT_ENDPOINT_SIZE,
152 .bDescriptorType = USB_DT_ENDPOINT,
153 .bmAttributes = USB_ENDPOINT_XFER_BULK,
154 .wMaxPacketSize = cpu_to_le16(512)
155 };
156
157 static struct usb_endpoint_descriptor hs_ep_out_desc = {
158 .bLength = USB_DT_ENDPOINT_SIZE,
159 .bDescriptorType = USB_DT_ENDPOINT,
160 .bmAttributes = USB_ENDPOINT_XFER_BULK,
161 .wMaxPacketSize = cpu_to_le16(512)
162 };
163
164 static struct usb_descriptor_header *hs_printer_function[] = {
165 (struct usb_descriptor_header *) &intf_desc,
166 (struct usb_descriptor_header *) &hs_ep_in_desc,
167 (struct usb_descriptor_header *) &hs_ep_out_desc,
168 NULL
169 };
170
171 /*
172 * Added endpoint descriptors for 3.0 devices
173 */
174
175 static struct usb_endpoint_descriptor ss_ep_in_desc = {
176 .bLength = USB_DT_ENDPOINT_SIZE,
177 .bDescriptorType = USB_DT_ENDPOINT,
178 .bmAttributes = USB_ENDPOINT_XFER_BULK,
179 .wMaxPacketSize = cpu_to_le16(1024),
180 };
181
182 static struct usb_ss_ep_comp_descriptor ss_ep_in_comp_desc = {
183 .bLength = sizeof(ss_ep_in_comp_desc),
184 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
185 };
186
187 static struct usb_endpoint_descriptor ss_ep_out_desc = {
188 .bLength = USB_DT_ENDPOINT_SIZE,
189 .bDescriptorType = USB_DT_ENDPOINT,
190 .bmAttributes = USB_ENDPOINT_XFER_BULK,
191 .wMaxPacketSize = cpu_to_le16(1024),
192 };
193
194 static struct usb_ss_ep_comp_descriptor ss_ep_out_comp_desc = {
195 .bLength = sizeof(ss_ep_out_comp_desc),
196 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
197 };
198
199 static struct usb_descriptor_header *ss_printer_function[] = {
200 (struct usb_descriptor_header *) &intf_desc,
201 (struct usb_descriptor_header *) &ss_ep_in_desc,
202 (struct usb_descriptor_header *) &ss_ep_in_comp_desc,
203 (struct usb_descriptor_header *) &ss_ep_out_desc,
204 (struct usb_descriptor_header *) &ss_ep_out_comp_desc,
205 NULL
206 };
207
208 /* maxpacket and other transfer characteristics vary by speed. */
209 static inline struct usb_endpoint_descriptor *ep_desc(struct usb_gadget *gadget,
210 struct usb_endpoint_descriptor *fs,
211 struct usb_endpoint_descriptor *hs,
212 struct usb_endpoint_descriptor *ss)
213 {
214 switch (gadget->speed) {
215 case USB_SPEED_SUPER:
216 return ss;
217 case USB_SPEED_HIGH:
218 return hs;
219 default:
220 return fs;
221 }
222 }
223
224 /*-------------------------------------------------------------------------*/
225
226 static struct usb_request *
227 printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
228 {
229 struct usb_request *req;
230
231 req = usb_ep_alloc_request(ep, gfp_flags);
232
233 if (req != NULL) {
234 req->length = len;
235 req->buf = kmalloc(len, gfp_flags);
236 if (req->buf == NULL) {
237 usb_ep_free_request(ep, req);
238 return NULL;
239 }
240 }
241
242 return req;
243 }
244
245 static void
246 printer_req_free(struct usb_ep *ep, struct usb_request *req)
247 {
248 if (ep != NULL && req != NULL) {
249 kfree(req->buf);
250 usb_ep_free_request(ep, req);
251 }
252 }
253
254 /*-------------------------------------------------------------------------*/
255
256 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
257 {
258 struct printer_dev *dev = ep->driver_data;
259 int status = req->status;
260 unsigned long flags;
261
262 spin_lock_irqsave(&dev->lock, flags);
263
264 list_del_init(&req->list); /* Remode from Active List */
265
266 switch (status) {
267
268 /* normal completion */
269 case 0:
270 if (req->actual > 0) {
271 list_add_tail(&req->list, &dev->rx_buffers);
272 DBG(dev, "G_Printer : rx length %d\n", req->actual);
273 } else {
274 list_add(&req->list, &dev->rx_reqs);
275 }
276 break;
277
278 /* software-driven interface shutdown */
279 case -ECONNRESET: /* unlink */
280 case -ESHUTDOWN: /* disconnect etc */
281 VDBG(dev, "rx shutdown, code %d\n", status);
282 list_add(&req->list, &dev->rx_reqs);
283 break;
284
285 /* for hardware automagic (such as pxa) */
286 case -ECONNABORTED: /* endpoint reset */
287 DBG(dev, "rx %s reset\n", ep->name);
288 list_add(&req->list, &dev->rx_reqs);
289 break;
290
291 /* data overrun */
292 case -EOVERFLOW:
293 /* FALLTHROUGH */
294
295 default:
296 DBG(dev, "rx status %d\n", status);
297 list_add(&req->list, &dev->rx_reqs);
298 break;
299 }
300
301 wake_up_interruptible(&dev->rx_wait);
302 spin_unlock_irqrestore(&dev->lock, flags);
303 }
304
305 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
306 {
307 struct printer_dev *dev = ep->driver_data;
308
309 switch (req->status) {
310 default:
311 VDBG(dev, "tx err %d\n", req->status);
312 /* FALLTHROUGH */
313 case -ECONNRESET: /* unlink */
314 case -ESHUTDOWN: /* disconnect etc */
315 break;
316 case 0:
317 break;
318 }
319
320 spin_lock(&dev->lock);
321 /* Take the request struct off the active list and put it on the
322 * free list.
323 */
324 list_del_init(&req->list);
325 list_add(&req->list, &dev->tx_reqs);
326 wake_up_interruptible(&dev->tx_wait);
327 if (likely(list_empty(&dev->tx_reqs_active)))
328 wake_up_interruptible(&dev->tx_flush_wait);
329
330 spin_unlock(&dev->lock);
331 }
332
333 /*-------------------------------------------------------------------------*/
334
335 static int
336 printer_open(struct inode *inode, struct file *fd)
337 {
338 struct printer_dev *dev;
339 unsigned long flags;
340 int ret = -EBUSY;
341
342 dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
343
344 spin_lock_irqsave(&dev->lock, flags);
345
346 if (!dev->printer_cdev_open) {
347 dev->printer_cdev_open = 1;
348 fd->private_data = dev;
349 ret = 0;
350 /* Change the printer status to show that it's on-line. */
351 dev->printer_status |= PRINTER_SELECTED;
352 }
353
354 spin_unlock_irqrestore(&dev->lock, flags);
355
356 DBG(dev, "printer_open returned %x\n", ret);
357 return ret;
358 }
359
360 static int
361 printer_close(struct inode *inode, struct file *fd)
362 {
363 struct printer_dev *dev = fd->private_data;
364 unsigned long flags;
365
366 spin_lock_irqsave(&dev->lock, flags);
367 dev->printer_cdev_open = 0;
368 fd->private_data = NULL;
369 /* Change printer status to show that the printer is off-line. */
370 dev->printer_status &= ~PRINTER_SELECTED;
371 spin_unlock_irqrestore(&dev->lock, flags);
372
373 DBG(dev, "printer_close\n");
374
375 return 0;
376 }
377
378 /* This function must be called with interrupts turned off. */
379 static void
380 setup_rx_reqs(struct printer_dev *dev)
381 {
382 struct usb_request *req;
383
384 while (likely(!list_empty(&dev->rx_reqs))) {
385 int error;
386
387 req = container_of(dev->rx_reqs.next,
388 struct usb_request, list);
389 list_del_init(&req->list);
390
391 /* The USB Host sends us whatever amount of data it wants to
392 * so we always set the length field to the full USB_BUFSIZE.
393 * If the amount of data is more than the read() caller asked
394 * for it will be stored in the request buffer until it is
395 * asked for by read().
396 */
397 req->length = USB_BUFSIZE;
398 req->complete = rx_complete;
399
400 /* here, we unlock, and only unlock, to avoid deadlock. */
401 spin_unlock(&dev->lock);
402 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
403 spin_lock(&dev->lock);
404 if (error) {
405 DBG(dev, "rx submit --> %d\n", error);
406 list_add(&req->list, &dev->rx_reqs);
407 break;
408 }
409 /* if the req is empty, then add it into dev->rx_reqs_active. */
410 else if (list_empty(&req->list))
411 list_add(&req->list, &dev->rx_reqs_active);
412 }
413 }
414
415 static ssize_t
416 printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
417 {
418 struct printer_dev *dev = fd->private_data;
419 unsigned long flags;
420 size_t size;
421 size_t bytes_copied;
422 struct usb_request *req;
423 /* This is a pointer to the current USB rx request. */
424 struct usb_request *current_rx_req;
425 /* This is the number of bytes in the current rx buffer. */
426 size_t current_rx_bytes;
427 /* This is a pointer to the current rx buffer. */
428 u8 *current_rx_buf;
429
430 if (len == 0)
431 return -EINVAL;
432
433 DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
434
435 mutex_lock(&dev->lock_printer_io);
436 spin_lock_irqsave(&dev->lock, flags);
437
438 /* We will use this flag later to check if a printer reset happened
439 * after we turn interrupts back on.
440 */
441 dev->reset_printer = 0;
442
443 setup_rx_reqs(dev);
444
445 bytes_copied = 0;
446 current_rx_req = dev->current_rx_req;
447 current_rx_bytes = dev->current_rx_bytes;
448 current_rx_buf = dev->current_rx_buf;
449 dev->current_rx_req = NULL;
450 dev->current_rx_bytes = 0;
451 dev->current_rx_buf = NULL;
452
453 /* Check if there is any data in the read buffers. Please note that
454 * current_rx_bytes is the number of bytes in the current rx buffer.
455 * If it is zero then check if there are any other rx_buffers that
456 * are on the completed list. We are only out of data if all rx
457 * buffers are empty.
458 */
459 if ((current_rx_bytes == 0) &&
460 (likely(list_empty(&dev->rx_buffers)))) {
461 /* Turn interrupts back on before sleeping. */
462 spin_unlock_irqrestore(&dev->lock, flags);
463
464 /*
465 * If no data is available check if this is a NON-Blocking
466 * call or not.
467 */
468 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
469 mutex_unlock(&dev->lock_printer_io);
470 return -EAGAIN;
471 }
472
473 /* Sleep until data is available */
474 wait_event_interruptible(dev->rx_wait,
475 (likely(!list_empty(&dev->rx_buffers))));
476 spin_lock_irqsave(&dev->lock, flags);
477 }
478
479 /* We have data to return then copy it to the caller's buffer.*/
480 while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
481 && len) {
482 if (current_rx_bytes == 0) {
483 req = container_of(dev->rx_buffers.next,
484 struct usb_request, list);
485 list_del_init(&req->list);
486
487 if (req->actual && req->buf) {
488 current_rx_req = req;
489 current_rx_bytes = req->actual;
490 current_rx_buf = req->buf;
491 } else {
492 list_add(&req->list, &dev->rx_reqs);
493 continue;
494 }
495 }
496
497 /* Don't leave irqs off while doing memory copies */
498 spin_unlock_irqrestore(&dev->lock, flags);
499
500 if (len > current_rx_bytes)
501 size = current_rx_bytes;
502 else
503 size = len;
504
505 size -= copy_to_user(buf, current_rx_buf, size);
506 bytes_copied += size;
507 len -= size;
508 buf += size;
509
510 spin_lock_irqsave(&dev->lock, flags);
511
512 /* We've disconnected or reset so return. */
513 if (dev->reset_printer) {
514 list_add(&current_rx_req->list, &dev->rx_reqs);
515 spin_unlock_irqrestore(&dev->lock, flags);
516 mutex_unlock(&dev->lock_printer_io);
517 return -EAGAIN;
518 }
519
520 /* If we not returning all the data left in this RX request
521 * buffer then adjust the amount of data left in the buffer.
522 * Othewise if we are done with this RX request buffer then
523 * requeue it to get any incoming data from the USB host.
524 */
525 if (size < current_rx_bytes) {
526 current_rx_bytes -= size;
527 current_rx_buf += size;
528 } else {
529 list_add(&current_rx_req->list, &dev->rx_reqs);
530 current_rx_bytes = 0;
531 current_rx_buf = NULL;
532 current_rx_req = NULL;
533 }
534 }
535
536 dev->current_rx_req = current_rx_req;
537 dev->current_rx_bytes = current_rx_bytes;
538 dev->current_rx_buf = current_rx_buf;
539
540 spin_unlock_irqrestore(&dev->lock, flags);
541 mutex_unlock(&dev->lock_printer_io);
542
543 DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
544
545 if (bytes_copied)
546 return bytes_copied;
547 else
548 return -EAGAIN;
549 }
550
551 static ssize_t
552 printer_write(struct file *fd, const 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; /* Amount of data in a TX request. */
557 size_t bytes_copied = 0;
558 struct usb_request *req;
559
560 DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
561
562 if (len == 0)
563 return -EINVAL;
564
565 mutex_lock(&dev->lock_printer_io);
566 spin_lock_irqsave(&dev->lock, flags);
567
568 /* Check if a printer reset happens while we have interrupts on */
569 dev->reset_printer = 0;
570
571 /* Check if there is any available write buffers */
572 if (likely(list_empty(&dev->tx_reqs))) {
573 /* Turn interrupts back on before sleeping. */
574 spin_unlock_irqrestore(&dev->lock, flags);
575
576 /*
577 * If write buffers are available check if this is
578 * a NON-Blocking call or not.
579 */
580 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
581 mutex_unlock(&dev->lock_printer_io);
582 return -EAGAIN;
583 }
584
585 /* Sleep until a write buffer is available */
586 wait_event_interruptible(dev->tx_wait,
587 (likely(!list_empty(&dev->tx_reqs))));
588 spin_lock_irqsave(&dev->lock, flags);
589 }
590
591 while (likely(!list_empty(&dev->tx_reqs)) && len) {
592
593 if (len > USB_BUFSIZE)
594 size = USB_BUFSIZE;
595 else
596 size = len;
597
598 req = container_of(dev->tx_reqs.next, struct usb_request,
599 list);
600 list_del_init(&req->list);
601
602 req->complete = tx_complete;
603 req->length = size;
604
605 /* Check if we need to send a zero length packet. */
606 if (len > size)
607 /* They will be more TX requests so no yet. */
608 req->zero = 0;
609 else
610 /* If the data amount is not a multiple of the
611 * maxpacket size then send a zero length packet.
612 */
613 req->zero = ((len % dev->in_ep->maxpacket) == 0);
614
615 /* Don't leave irqs off while doing memory copies */
616 spin_unlock_irqrestore(&dev->lock, flags);
617
618 if (copy_from_user(req->buf, buf, size)) {
619 list_add(&req->list, &dev->tx_reqs);
620 mutex_unlock(&dev->lock_printer_io);
621 return bytes_copied;
622 }
623
624 bytes_copied += size;
625 len -= size;
626 buf += size;
627
628 spin_lock_irqsave(&dev->lock, flags);
629
630 /* We've disconnected or reset so free the req and buffer */
631 if (dev->reset_printer) {
632 list_add(&req->list, &dev->tx_reqs);
633 spin_unlock_irqrestore(&dev->lock, flags);
634 mutex_unlock(&dev->lock_printer_io);
635 return -EAGAIN;
636 }
637
638 if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
639 list_add(&req->list, &dev->tx_reqs);
640 spin_unlock_irqrestore(&dev->lock, flags);
641 mutex_unlock(&dev->lock_printer_io);
642 return -EAGAIN;
643 }
644
645 list_add(&req->list, &dev->tx_reqs_active);
646
647 }
648
649 spin_unlock_irqrestore(&dev->lock, flags);
650 mutex_unlock(&dev->lock_printer_io);
651
652 DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
653
654 if (bytes_copied)
655 return bytes_copied;
656 else
657 return -EAGAIN;
658 }
659
660 static int
661 printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync)
662 {
663 struct printer_dev *dev = fd->private_data;
664 struct inode *inode = file_inode(fd);
665 unsigned long flags;
666 int tx_list_empty;
667
668 inode_lock(inode);
669 spin_lock_irqsave(&dev->lock, flags);
670 tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
671 spin_unlock_irqrestore(&dev->lock, flags);
672
673 if (!tx_list_empty) {
674 /* Sleep until all data has been sent */
675 wait_event_interruptible(dev->tx_flush_wait,
676 (likely(list_empty(&dev->tx_reqs_active))));
677 }
678 inode_unlock(inode);
679
680 return 0;
681 }
682
683 static unsigned int
684 printer_poll(struct file *fd, poll_table *wait)
685 {
686 struct printer_dev *dev = fd->private_data;
687 unsigned long flags;
688 int status = 0;
689
690 mutex_lock(&dev->lock_printer_io);
691 spin_lock_irqsave(&dev->lock, flags);
692 setup_rx_reqs(dev);
693 spin_unlock_irqrestore(&dev->lock, flags);
694 mutex_unlock(&dev->lock_printer_io);
695
696 poll_wait(fd, &dev->rx_wait, wait);
697 poll_wait(fd, &dev->tx_wait, wait);
698
699 spin_lock_irqsave(&dev->lock, flags);
700 if (likely(!list_empty(&dev->tx_reqs)))
701 status |= POLLOUT | POLLWRNORM;
702
703 if (likely(dev->current_rx_bytes) ||
704 likely(!list_empty(&dev->rx_buffers)))
705 status |= POLLIN | POLLRDNORM;
706
707 spin_unlock_irqrestore(&dev->lock, flags);
708
709 return status;
710 }
711
712 static long
713 printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
714 {
715 struct printer_dev *dev = fd->private_data;
716 unsigned long flags;
717 int status = 0;
718
719 DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
720
721 /* handle ioctls */
722
723 spin_lock_irqsave(&dev->lock, flags);
724
725 switch (code) {
726 case GADGET_GET_PRINTER_STATUS:
727 status = (int)dev->printer_status;
728 break;
729 case GADGET_SET_PRINTER_STATUS:
730 dev->printer_status = (u8)arg;
731 break;
732 default:
733 /* could not handle ioctl */
734 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
735 code);
736 status = -ENOTTY;
737 }
738
739 spin_unlock_irqrestore(&dev->lock, flags);
740
741 return status;
742 }
743
744 /* used after endpoint configuration */
745 static const struct file_operations printer_io_operations = {
746 .owner = THIS_MODULE,
747 .open = printer_open,
748 .read = printer_read,
749 .write = printer_write,
750 .fsync = printer_fsync,
751 .poll = printer_poll,
752 .unlocked_ioctl = printer_ioctl,
753 .release = printer_close,
754 .llseek = noop_llseek,
755 };
756
757 /*-------------------------------------------------------------------------*/
758
759 static int
760 set_printer_interface(struct printer_dev *dev)
761 {
762 int result = 0;
763
764 dev->in_ep->desc = ep_desc(dev->gadget, &fs_ep_in_desc, &hs_ep_in_desc,
765 &ss_ep_in_desc);
766 dev->in_ep->driver_data = dev;
767
768 dev->out_ep->desc = ep_desc(dev->gadget, &fs_ep_out_desc,
769 &hs_ep_out_desc, &ss_ep_out_desc);
770 dev->out_ep->driver_data = dev;
771
772 result = usb_ep_enable(dev->in_ep);
773 if (result != 0) {
774 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
775 goto done;
776 }
777
778 result = usb_ep_enable(dev->out_ep);
779 if (result != 0) {
780 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
781 goto done;
782 }
783
784 done:
785 /* on error, disable any endpoints */
786 if (result != 0) {
787 (void) usb_ep_disable(dev->in_ep);
788 (void) usb_ep_disable(dev->out_ep);
789 dev->in_ep->desc = NULL;
790 dev->out_ep->desc = NULL;
791 }
792
793 /* caller is responsible for cleanup on error */
794 return result;
795 }
796
797 static void printer_reset_interface(struct printer_dev *dev)
798 {
799 unsigned long flags;
800
801 if (dev->interface < 0)
802 return;
803
804 DBG(dev, "%s\n", __func__);
805
806 if (dev->in_ep->desc)
807 usb_ep_disable(dev->in_ep);
808
809 if (dev->out_ep->desc)
810 usb_ep_disable(dev->out_ep);
811
812 spin_lock_irqsave(&dev->lock, flags);
813 dev->in_ep->desc = NULL;
814 dev->out_ep->desc = NULL;
815 dev->interface = -1;
816 spin_unlock_irqrestore(&dev->lock, flags);
817 }
818
819 /* Change our operational Interface. */
820 static int set_interface(struct printer_dev *dev, unsigned number)
821 {
822 int result = 0;
823
824 /* Free the current interface */
825 printer_reset_interface(dev);
826
827 result = set_printer_interface(dev);
828 if (result)
829 printer_reset_interface(dev);
830 else
831 dev->interface = number;
832
833 if (!result)
834 INFO(dev, "Using interface %x\n", number);
835
836 return result;
837 }
838
839 static void printer_soft_reset(struct printer_dev *dev)
840 {
841 struct usb_request *req;
842
843 INFO(dev, "Received Printer Reset Request\n");
844
845 if (usb_ep_disable(dev->in_ep))
846 DBG(dev, "Failed to disable USB in_ep\n");
847 if (usb_ep_disable(dev->out_ep))
848 DBG(dev, "Failed to disable USB out_ep\n");
849
850 if (dev->current_rx_req != NULL) {
851 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
852 dev->current_rx_req = NULL;
853 }
854 dev->current_rx_bytes = 0;
855 dev->current_rx_buf = NULL;
856 dev->reset_printer = 1;
857
858 while (likely(!(list_empty(&dev->rx_buffers)))) {
859 req = container_of(dev->rx_buffers.next, struct usb_request,
860 list);
861 list_del_init(&req->list);
862 list_add(&req->list, &dev->rx_reqs);
863 }
864
865 while (likely(!(list_empty(&dev->rx_reqs_active)))) {
866 req = container_of(dev->rx_buffers.next, struct usb_request,
867 list);
868 list_del_init(&req->list);
869 list_add(&req->list, &dev->rx_reqs);
870 }
871
872 while (likely(!(list_empty(&dev->tx_reqs_active)))) {
873 req = container_of(dev->tx_reqs_active.next,
874 struct usb_request, list);
875 list_del_init(&req->list);
876 list_add(&req->list, &dev->tx_reqs);
877 }
878
879 if (usb_ep_enable(dev->in_ep))
880 DBG(dev, "Failed to enable USB in_ep\n");
881 if (usb_ep_enable(dev->out_ep))
882 DBG(dev, "Failed to enable USB out_ep\n");
883
884 wake_up_interruptible(&dev->rx_wait);
885 wake_up_interruptible(&dev->tx_wait);
886 wake_up_interruptible(&dev->tx_flush_wait);
887 }
888
889 /*-------------------------------------------------------------------------*/
890
891 static bool gprinter_req_match(struct usb_function *f,
892 const struct usb_ctrlrequest *ctrl)
893 {
894 struct printer_dev *dev = func_to_printer(f);
895 u16 w_index = le16_to_cpu(ctrl->wIndex);
896 u16 w_value = le16_to_cpu(ctrl->wValue);
897 u16 w_length = le16_to_cpu(ctrl->wLength);
898
899 if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE ||
900 (ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
901 return false;
902
903 switch (ctrl->bRequest) {
904 case GET_DEVICE_ID:
905 w_index >>= 8;
906 if (w_length <= PNP_STRING_LEN &&
907 (USB_DIR_IN & ctrl->bRequestType))
908 break;
909 return false;
910 case GET_PORT_STATUS:
911 if (!w_value && w_length == 1 &&
912 (USB_DIR_IN & ctrl->bRequestType))
913 break;
914 return false;
915 case SOFT_RESET:
916 if (!w_value && !w_length &&
917 !(USB_DIR_IN & ctrl->bRequestType))
918 break;
919 /* fall through */
920 default:
921 return false;
922 }
923 return w_index == dev->interface;
924 }
925
926 /*
927 * The setup() callback implements all the ep0 functionality that's not
928 * handled lower down.
929 */
930 static int printer_func_setup(struct usb_function *f,
931 const struct usb_ctrlrequest *ctrl)
932 {
933 struct printer_dev *dev = func_to_printer(f);
934 struct usb_composite_dev *cdev = f->config->cdev;
935 struct usb_request *req = cdev->req;
936 int value = -EOPNOTSUPP;
937 u16 wIndex = le16_to_cpu(ctrl->wIndex);
938 u16 wValue = le16_to_cpu(ctrl->wValue);
939 u16 wLength = le16_to_cpu(ctrl->wLength);
940
941 DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
942 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
943
944 switch (ctrl->bRequestType&USB_TYPE_MASK) {
945 case USB_TYPE_CLASS:
946 switch (ctrl->bRequest) {
947 case GET_DEVICE_ID: /* Get the IEEE-1284 PNP String */
948 /* Only one printer interface is supported. */
949 if ((wIndex>>8) != dev->interface)
950 break;
951
952 value = (dev->pnp_string[0] << 8) | dev->pnp_string[1];
953 memcpy(req->buf, dev->pnp_string, value);
954 DBG(dev, "1284 PNP String: %x %s\n", value,
955 &dev->pnp_string[2]);
956 break;
957
958 case GET_PORT_STATUS: /* Get Port Status */
959 /* Only one printer interface is supported. */
960 if (wIndex != dev->interface)
961 break;
962
963 *(u8 *)req->buf = dev->printer_status;
964 value = min_t(u16, wLength, 1);
965 break;
966
967 case SOFT_RESET: /* Soft Reset */
968 /* Only one printer interface is supported. */
969 if (wIndex != dev->interface)
970 break;
971
972 printer_soft_reset(dev);
973
974 value = 0;
975 break;
976
977 default:
978 goto unknown;
979 }
980 break;
981
982 default:
983 unknown:
984 VDBG(dev,
985 "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
986 ctrl->bRequestType, ctrl->bRequest,
987 wValue, wIndex, wLength);
988 break;
989 }
990 /* host either stalls (value < 0) or reports success */
991 if (value >= 0) {
992 req->length = value;
993 req->zero = value < wLength;
994 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
995 if (value < 0) {
996 ERROR(dev, "%s:%d Error!\n", __func__, __LINE__);
997 req->status = 0;
998 }
999 }
1000 return value;
1001 }
1002
1003 static int printer_func_bind(struct usb_configuration *c,
1004 struct usb_function *f)
1005 {
1006 struct usb_gadget *gadget = c->cdev->gadget;
1007 struct printer_dev *dev = func_to_printer(f);
1008 struct device *pdev;
1009 struct usb_composite_dev *cdev = c->cdev;
1010 struct usb_ep *in_ep;
1011 struct usb_ep *out_ep = NULL;
1012 struct usb_request *req;
1013 dev_t devt;
1014 int id;
1015 int ret;
1016 u32 i;
1017
1018 id = usb_interface_id(c, f);
1019 if (id < 0)
1020 return id;
1021 intf_desc.bInterfaceNumber = id;
1022
1023 /* finish hookup to lower layer ... */
1024 dev->gadget = gadget;
1025
1026 /* all we really need is bulk IN/OUT */
1027 in_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_in_desc);
1028 if (!in_ep) {
1029 autoconf_fail:
1030 dev_err(&cdev->gadget->dev, "can't autoconfigure on %s\n",
1031 cdev->gadget->name);
1032 return -ENODEV;
1033 }
1034
1035 out_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_out_desc);
1036 if (!out_ep)
1037 goto autoconf_fail;
1038
1039 /* assumes that all endpoints are dual-speed */
1040 hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1041 hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1042 ss_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1043 ss_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1044
1045 ret = usb_assign_descriptors(f, fs_printer_function,
1046 hs_printer_function, ss_printer_function, NULL);
1047 if (ret)
1048 return ret;
1049
1050 dev->in_ep = in_ep;
1051 dev->out_ep = out_ep;
1052
1053 ret = -ENOMEM;
1054 for (i = 0; i < dev->q_len; i++) {
1055 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1056 if (!req)
1057 goto fail_tx_reqs;
1058 list_add(&req->list, &dev->tx_reqs);
1059 }
1060
1061 for (i = 0; i < dev->q_len; i++) {
1062 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1063 if (!req)
1064 goto fail_rx_reqs;
1065 list_add(&req->list, &dev->rx_reqs);
1066 }
1067
1068 /* Setup the sysfs files for the printer gadget. */
1069 devt = MKDEV(major, dev->minor);
1070 pdev = device_create(usb_gadget_class, NULL, devt,
1071 NULL, "g_printer%d", dev->minor);
1072 if (IS_ERR(pdev)) {
1073 ERROR(dev, "Failed to create device: g_printer\n");
1074 ret = PTR_ERR(pdev);
1075 goto fail_rx_reqs;
1076 }
1077
1078 /*
1079 * Register a character device as an interface to a user mode
1080 * program that handles the printer specific functionality.
1081 */
1082 cdev_init(&dev->printer_cdev, &printer_io_operations);
1083 dev->printer_cdev.owner = THIS_MODULE;
1084 ret = cdev_add(&dev->printer_cdev, devt, 1);
1085 if (ret) {
1086 ERROR(dev, "Failed to open char device\n");
1087 goto fail_cdev_add;
1088 }
1089
1090 return 0;
1091
1092 fail_cdev_add:
1093 device_destroy(usb_gadget_class, devt);
1094
1095 fail_rx_reqs:
1096 while (!list_empty(&dev->rx_reqs)) {
1097 req = container_of(dev->rx_reqs.next, struct usb_request, list);
1098 list_del(&req->list);
1099 printer_req_free(dev->out_ep, req);
1100 }
1101
1102 fail_tx_reqs:
1103 while (!list_empty(&dev->tx_reqs)) {
1104 req = container_of(dev->tx_reqs.next, struct usb_request, list);
1105 list_del(&req->list);
1106 printer_req_free(dev->in_ep, req);
1107 }
1108
1109 return ret;
1110
1111 }
1112
1113 static int printer_func_set_alt(struct usb_function *f,
1114 unsigned intf, unsigned alt)
1115 {
1116 struct printer_dev *dev = func_to_printer(f);
1117 int ret = -ENOTSUPP;
1118
1119 if (!alt)
1120 ret = set_interface(dev, intf);
1121
1122 return ret;
1123 }
1124
1125 static void printer_func_disable(struct usb_function *f)
1126 {
1127 struct printer_dev *dev = func_to_printer(f);
1128
1129 DBG(dev, "%s\n", __func__);
1130
1131 printer_reset_interface(dev);
1132 }
1133
1134 static inline struct f_printer_opts
1135 *to_f_printer_opts(struct config_item *item)
1136 {
1137 return container_of(to_config_group(item), struct f_printer_opts,
1138 func_inst.group);
1139 }
1140
1141 static void printer_attr_release(struct config_item *item)
1142 {
1143 struct f_printer_opts *opts = to_f_printer_opts(item);
1144
1145 usb_put_function_instance(&opts->func_inst);
1146 }
1147
1148 static struct configfs_item_operations printer_item_ops = {
1149 .release = printer_attr_release,
1150 };
1151
1152 static ssize_t f_printer_opts_pnp_string_show(struct config_item *item,
1153 char *page)
1154 {
1155 struct f_printer_opts *opts = to_f_printer_opts(item);
1156 int result;
1157
1158 mutex_lock(&opts->lock);
1159 result = strlcpy(page, opts->pnp_string + 2, PNP_STRING_LEN - 2);
1160 mutex_unlock(&opts->lock);
1161
1162 return result;
1163 }
1164
1165 static ssize_t f_printer_opts_pnp_string_store(struct config_item *item,
1166 const char *page, size_t len)
1167 {
1168 struct f_printer_opts *opts = to_f_printer_opts(item);
1169 int result, l;
1170
1171 mutex_lock(&opts->lock);
1172 result = strlcpy(opts->pnp_string + 2, page, PNP_STRING_LEN - 2);
1173 l = strlen(opts->pnp_string + 2) + 2;
1174 opts->pnp_string[0] = (l >> 8) & 0xFF;
1175 opts->pnp_string[1] = l & 0xFF;
1176 mutex_unlock(&opts->lock);
1177
1178 return result;
1179 }
1180
1181 CONFIGFS_ATTR(f_printer_opts_, pnp_string);
1182
1183 static ssize_t f_printer_opts_q_len_show(struct config_item *item,
1184 char *page)
1185 {
1186 struct f_printer_opts *opts = to_f_printer_opts(item);
1187 int result;
1188
1189 mutex_lock(&opts->lock);
1190 result = sprintf(page, "%d\n", opts->q_len);
1191 mutex_unlock(&opts->lock);
1192
1193 return result;
1194 }
1195
1196 static ssize_t f_printer_opts_q_len_store(struct config_item *item,
1197 const char *page, size_t len)
1198 {
1199 struct f_printer_opts *opts = to_f_printer_opts(item);
1200 int ret;
1201 u16 num;
1202
1203 mutex_lock(&opts->lock);
1204 if (opts->refcnt) {
1205 ret = -EBUSY;
1206 goto end;
1207 }
1208
1209 ret = kstrtou16(page, 0, &num);
1210 if (ret)
1211 goto end;
1212
1213 opts->q_len = (unsigned)num;
1214 ret = len;
1215 end:
1216 mutex_unlock(&opts->lock);
1217 return ret;
1218 }
1219
1220 CONFIGFS_ATTR(f_printer_opts_, q_len);
1221
1222 static struct configfs_attribute *printer_attrs[] = {
1223 &f_printer_opts_attr_pnp_string,
1224 &f_printer_opts_attr_q_len,
1225 NULL,
1226 };
1227
1228 static struct config_item_type printer_func_type = {
1229 .ct_item_ops = &printer_item_ops,
1230 .ct_attrs = printer_attrs,
1231 .ct_owner = THIS_MODULE,
1232 };
1233
1234 static inline int gprinter_get_minor(void)
1235 {
1236 int ret;
1237
1238 ret = ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL);
1239 if (ret >= PRINTER_MINORS) {
1240 ida_simple_remove(&printer_ida, ret);
1241 ret = -ENODEV;
1242 }
1243
1244 return ret;
1245 }
1246
1247 static inline void gprinter_put_minor(int minor)
1248 {
1249 ida_simple_remove(&printer_ida, minor);
1250 }
1251
1252 static int gprinter_setup(int);
1253 static void gprinter_cleanup(void);
1254
1255 static void gprinter_free_inst(struct usb_function_instance *f)
1256 {
1257 struct f_printer_opts *opts;
1258
1259 opts = container_of(f, struct f_printer_opts, func_inst);
1260
1261 mutex_lock(&printer_ida_lock);
1262
1263 gprinter_put_minor(opts->minor);
1264 if (idr_is_empty(&printer_ida.idr))
1265 gprinter_cleanup();
1266
1267 mutex_unlock(&printer_ida_lock);
1268
1269 kfree(opts);
1270 }
1271
1272 static struct usb_function_instance *gprinter_alloc_inst(void)
1273 {
1274 struct f_printer_opts *opts;
1275 struct usb_function_instance *ret;
1276 int status = 0;
1277
1278 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1279 if (!opts)
1280 return ERR_PTR(-ENOMEM);
1281
1282 mutex_init(&opts->lock);
1283 opts->func_inst.free_func_inst = gprinter_free_inst;
1284 ret = &opts->func_inst;
1285
1286 mutex_lock(&printer_ida_lock);
1287
1288 if (idr_is_empty(&printer_ida.idr)) {
1289 status = gprinter_setup(PRINTER_MINORS);
1290 if (status) {
1291 ret = ERR_PTR(status);
1292 kfree(opts);
1293 goto unlock;
1294 }
1295 }
1296
1297 opts->minor = gprinter_get_minor();
1298 if (opts->minor < 0) {
1299 ret = ERR_PTR(opts->minor);
1300 kfree(opts);
1301 if (idr_is_empty(&printer_ida.idr))
1302 gprinter_cleanup();
1303 goto unlock;
1304 }
1305 config_group_init_type_name(&opts->func_inst.group, "",
1306 &printer_func_type);
1307
1308 unlock:
1309 mutex_unlock(&printer_ida_lock);
1310 return ret;
1311 }
1312
1313 static void gprinter_free(struct usb_function *f)
1314 {
1315 struct printer_dev *dev = func_to_printer(f);
1316 struct f_printer_opts *opts;
1317
1318 opts = container_of(f->fi, struct f_printer_opts, func_inst);
1319 kfree(dev);
1320 mutex_lock(&opts->lock);
1321 --opts->refcnt;
1322 mutex_unlock(&opts->lock);
1323 }
1324
1325 static void printer_func_unbind(struct usb_configuration *c,
1326 struct usb_function *f)
1327 {
1328 struct printer_dev *dev;
1329 struct usb_request *req;
1330
1331 dev = func_to_printer(f);
1332
1333 device_destroy(usb_gadget_class, MKDEV(major, dev->minor));
1334
1335 /* Remove Character Device */
1336 cdev_del(&dev->printer_cdev);
1337
1338 /* we must already have been disconnected ... no i/o may be active */
1339 WARN_ON(!list_empty(&dev->tx_reqs_active));
1340 WARN_ON(!list_empty(&dev->rx_reqs_active));
1341
1342 /* Free all memory for this driver. */
1343 while (!list_empty(&dev->tx_reqs)) {
1344 req = container_of(dev->tx_reqs.next, struct usb_request,
1345 list);
1346 list_del(&req->list);
1347 printer_req_free(dev->in_ep, req);
1348 }
1349
1350 if (dev->current_rx_req != NULL)
1351 printer_req_free(dev->out_ep, dev->current_rx_req);
1352
1353 while (!list_empty(&dev->rx_reqs)) {
1354 req = container_of(dev->rx_reqs.next,
1355 struct usb_request, list);
1356 list_del(&req->list);
1357 printer_req_free(dev->out_ep, req);
1358 }
1359
1360 while (!list_empty(&dev->rx_buffers)) {
1361 req = container_of(dev->rx_buffers.next,
1362 struct usb_request, list);
1363 list_del(&req->list);
1364 printer_req_free(dev->out_ep, req);
1365 }
1366 usb_free_all_descriptors(f);
1367 }
1368
1369 static struct usb_function *gprinter_alloc(struct usb_function_instance *fi)
1370 {
1371 struct printer_dev *dev;
1372 struct f_printer_opts *opts;
1373
1374 opts = container_of(fi, struct f_printer_opts, func_inst);
1375
1376 mutex_lock(&opts->lock);
1377 if (opts->minor >= minors) {
1378 mutex_unlock(&opts->lock);
1379 return ERR_PTR(-ENOENT);
1380 }
1381
1382 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1383 if (!dev) {
1384 mutex_unlock(&opts->lock);
1385 return ERR_PTR(-ENOMEM);
1386 }
1387
1388 ++opts->refcnt;
1389 dev->minor = opts->minor;
1390 dev->pnp_string = opts->pnp_string;
1391 dev->q_len = opts->q_len;
1392 mutex_unlock(&opts->lock);
1393
1394 dev->function.name = "printer";
1395 dev->function.bind = printer_func_bind;
1396 dev->function.setup = printer_func_setup;
1397 dev->function.unbind = printer_func_unbind;
1398 dev->function.set_alt = printer_func_set_alt;
1399 dev->function.disable = printer_func_disable;
1400 dev->function.req_match = gprinter_req_match;
1401 dev->function.free_func = gprinter_free;
1402
1403 INIT_LIST_HEAD(&dev->tx_reqs);
1404 INIT_LIST_HEAD(&dev->rx_reqs);
1405 INIT_LIST_HEAD(&dev->rx_buffers);
1406 INIT_LIST_HEAD(&dev->tx_reqs_active);
1407 INIT_LIST_HEAD(&dev->rx_reqs_active);
1408
1409 spin_lock_init(&dev->lock);
1410 mutex_init(&dev->lock_printer_io);
1411 init_waitqueue_head(&dev->rx_wait);
1412 init_waitqueue_head(&dev->tx_wait);
1413 init_waitqueue_head(&dev->tx_flush_wait);
1414
1415 dev->interface = -1;
1416 dev->printer_cdev_open = 0;
1417 dev->printer_status = PRINTER_NOT_ERROR;
1418 dev->current_rx_req = NULL;
1419 dev->current_rx_bytes = 0;
1420 dev->current_rx_buf = NULL;
1421
1422 return &dev->function;
1423 }
1424
1425 DECLARE_USB_FUNCTION_INIT(printer, gprinter_alloc_inst, gprinter_alloc);
1426 MODULE_LICENSE("GPL");
1427 MODULE_AUTHOR("Craig Nadler");
1428
1429 static int gprinter_setup(int count)
1430 {
1431 int status;
1432 dev_t devt;
1433
1434 usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1435 if (IS_ERR(usb_gadget_class)) {
1436 status = PTR_ERR(usb_gadget_class);
1437 usb_gadget_class = NULL;
1438 pr_err("unable to create usb_gadget class %d\n", status);
1439 return status;
1440 }
1441
1442 status = alloc_chrdev_region(&devt, 0, count, "USB printer gadget");
1443 if (status) {
1444 pr_err("alloc_chrdev_region %d\n", status);
1445 class_destroy(usb_gadget_class);
1446 usb_gadget_class = NULL;
1447 return status;
1448 }
1449
1450 major = MAJOR(devt);
1451 minors = count;
1452
1453 return status;
1454 }
1455
1456 static void gprinter_cleanup(void)
1457 {
1458 if (major) {
1459 unregister_chrdev_region(MKDEV(major, 0), minors);
1460 major = minors = 0;
1461 }
1462 class_destroy(usb_gadget_class);
1463 usb_gadget_class = NULL;
1464 }
Linux kernel - Deliverables
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