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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / usb / gadget / function / f_printer.c
blob0de36cda6e4106156821e4d024c800cf6c4af206
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 bool config0)
894 {
895 struct printer_dev *dev = func_to_printer(f);
896 u16 w_index = le16_to_cpu(ctrl->wIndex);
897 u16 w_value = le16_to_cpu(ctrl->wValue);
898 u16 w_length = le16_to_cpu(ctrl->wLength);
899
900 if (config0)
901 return false;
902
903 if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE ||
904 (ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
905 return false;
906
907 switch (ctrl->bRequest) {
908 case GET_DEVICE_ID:
909 w_index >>= 8;
910 if (w_length <= PNP_STRING_LEN &&
911 (USB_DIR_IN & ctrl->bRequestType))
912 break;
913 return false;
914 case GET_PORT_STATUS:
915 if (!w_value && w_length == 1 &&
916 (USB_DIR_IN & ctrl->bRequestType))
917 break;
918 return false;
919 case SOFT_RESET:
920 if (!w_value && !w_length &&
921 !(USB_DIR_IN & ctrl->bRequestType))
922 break;
923 /* fall through */
924 default:
925 return false;
926 }
927 return w_index == dev->interface;
928 }
929
930 /*
931 * The setup() callback implements all the ep0 functionality that's not
932 * handled lower down.
933 */
934 static int printer_func_setup(struct usb_function *f,
935 const struct usb_ctrlrequest *ctrl)
936 {
937 struct printer_dev *dev = func_to_printer(f);
938 struct usb_composite_dev *cdev = f->config->cdev;
939 struct usb_request *req = cdev->req;
940 int value = -EOPNOTSUPP;
941 u16 wIndex = le16_to_cpu(ctrl->wIndex);
942 u16 wValue = le16_to_cpu(ctrl->wValue);
943 u16 wLength = le16_to_cpu(ctrl->wLength);
944
945 DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
946 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
947
948 switch (ctrl->bRequestType&USB_TYPE_MASK) {
949 case USB_TYPE_CLASS:
950 switch (ctrl->bRequest) {
951 case GET_DEVICE_ID: /* Get the IEEE-1284 PNP String */
952 /* Only one printer interface is supported. */
953 if ((wIndex>>8) != dev->interface)
954 break;
955
956 value = (dev->pnp_string[0] << 8) | dev->pnp_string[1];
957 memcpy(req->buf, dev->pnp_string, value);
958 DBG(dev, "1284 PNP String: %x %s\n", value,
959 &dev->pnp_string[2]);
960 break;
961
962 case GET_PORT_STATUS: /* Get Port Status */
963 /* Only one printer interface is supported. */
964 if (wIndex != dev->interface)
965 break;
966
967 *(u8 *)req->buf = dev->printer_status;
968 value = min_t(u16, wLength, 1);
969 break;
970
971 case SOFT_RESET: /* Soft Reset */
972 /* Only one printer interface is supported. */
973 if (wIndex != dev->interface)
974 break;
975
976 printer_soft_reset(dev);
977
978 value = 0;
979 break;
980
981 default:
982 goto unknown;
983 }
984 break;
985
986 default:
987 unknown:
988 VDBG(dev,
989 "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
990 ctrl->bRequestType, ctrl->bRequest,
991 wValue, wIndex, wLength);
992 break;
993 }
994 /* host either stalls (value < 0) or reports success */
995 if (value >= 0) {
996 req->length = value;
997 req->zero = value < wLength;
998 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
999 if (value < 0) {
1000 ERROR(dev, "%s:%d Error!\n", __func__, __LINE__);
1001 req->status = 0;
1002 }
1003 }
1004 return value;
1005 }
1006
1007 static int printer_func_bind(struct usb_configuration *c,
1008 struct usb_function *f)
1009 {
1010 struct usb_gadget *gadget = c->cdev->gadget;
1011 struct printer_dev *dev = func_to_printer(f);
1012 struct device *pdev;
1013 struct usb_composite_dev *cdev = c->cdev;
1014 struct usb_ep *in_ep;
1015 struct usb_ep *out_ep = NULL;
1016 struct usb_request *req;
1017 dev_t devt;
1018 int id;
1019 int ret;
1020 u32 i;
1021
1022 id = usb_interface_id(c, f);
1023 if (id < 0)
1024 return id;
1025 intf_desc.bInterfaceNumber = id;
1026
1027 /* finish hookup to lower layer ... */
1028 dev->gadget = gadget;
1029
1030 /* all we really need is bulk IN/OUT */
1031 in_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_in_desc);
1032 if (!in_ep) {
1033 autoconf_fail:
1034 dev_err(&cdev->gadget->dev, "can't autoconfigure on %s\n",
1035 cdev->gadget->name);
1036 return -ENODEV;
1037 }
1038
1039 out_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_out_desc);
1040 if (!out_ep)
1041 goto autoconf_fail;
1042
1043 /* assumes that all endpoints are dual-speed */
1044 hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1045 hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1046 ss_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1047 ss_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1048
1049 ret = usb_assign_descriptors(f, fs_printer_function,
1050 hs_printer_function, ss_printer_function, NULL);
1051 if (ret)
1052 return ret;
1053
1054 dev->in_ep = in_ep;
1055 dev->out_ep = out_ep;
1056
1057 ret = -ENOMEM;
1058 for (i = 0; i < dev->q_len; i++) {
1059 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1060 if (!req)
1061 goto fail_tx_reqs;
1062 list_add(&req->list, &dev->tx_reqs);
1063 }
1064
1065 for (i = 0; i < dev->q_len; i++) {
1066 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1067 if (!req)
1068 goto fail_rx_reqs;
1069 list_add(&req->list, &dev->rx_reqs);
1070 }
1071
1072 /* Setup the sysfs files for the printer gadget. */
1073 devt = MKDEV(major, dev->minor);
1074 pdev = device_create(usb_gadget_class, NULL, devt,
1075 NULL, "g_printer%d", dev->minor);
1076 if (IS_ERR(pdev)) {
1077 ERROR(dev, "Failed to create device: g_printer\n");
1078 ret = PTR_ERR(pdev);
1079 goto fail_rx_reqs;
1080 }
1081
1082 /*
1083 * Register a character device as an interface to a user mode
1084 * program that handles the printer specific functionality.
1085 */
1086 cdev_init(&dev->printer_cdev, &printer_io_operations);
1087 dev->printer_cdev.owner = THIS_MODULE;
1088 ret = cdev_add(&dev->printer_cdev, devt, 1);
1089 if (ret) {
1090 ERROR(dev, "Failed to open char device\n");
1091 goto fail_cdev_add;
1092 }
1093
1094 return 0;
1095
1096 fail_cdev_add:
1097 device_destroy(usb_gadget_class, devt);
1098
1099 fail_rx_reqs:
1100 while (!list_empty(&dev->rx_reqs)) {
1101 req = container_of(dev->rx_reqs.next, struct usb_request, list);
1102 list_del(&req->list);
1103 printer_req_free(dev->out_ep, req);
1104 }
1105
1106 fail_tx_reqs:
1107 while (!list_empty(&dev->tx_reqs)) {
1108 req = container_of(dev->tx_reqs.next, struct usb_request, list);
1109 list_del(&req->list);
1110 printer_req_free(dev->in_ep, req);
1111 }
1112
1113 return ret;
1114
1115 }
1116
1117 static int printer_func_set_alt(struct usb_function *f,
1118 unsigned intf, unsigned alt)
1119 {
1120 struct printer_dev *dev = func_to_printer(f);
1121 int ret = -ENOTSUPP;
1122
1123 if (!alt)
1124 ret = set_interface(dev, intf);
1125
1126 return ret;
1127 }
1128
1129 static void printer_func_disable(struct usb_function *f)
1130 {
1131 struct printer_dev *dev = func_to_printer(f);
1132
1133 DBG(dev, "%s\n", __func__);
1134
1135 printer_reset_interface(dev);
1136 }
1137
1138 static inline struct f_printer_opts
1139 *to_f_printer_opts(struct config_item *item)
1140 {
1141 return container_of(to_config_group(item), struct f_printer_opts,
1142 func_inst.group);
1143 }
1144
1145 static void printer_attr_release(struct config_item *item)
1146 {
1147 struct f_printer_opts *opts = to_f_printer_opts(item);
1148
1149 usb_put_function_instance(&opts->func_inst);
1150 }
1151
1152 static struct configfs_item_operations printer_item_ops = {
1153 .release = printer_attr_release,
1154 };
1155
1156 static ssize_t f_printer_opts_pnp_string_show(struct config_item *item,
1157 char *page)
1158 {
1159 struct f_printer_opts *opts = to_f_printer_opts(item);
1160 int result;
1161
1162 mutex_lock(&opts->lock);
1163 result = strlcpy(page, opts->pnp_string + 2, PNP_STRING_LEN - 2);
1164 mutex_unlock(&opts->lock);
1165
1166 return result;
1167 }
1168
1169 static ssize_t f_printer_opts_pnp_string_store(struct config_item *item,
1170 const char *page, size_t len)
1171 {
1172 struct f_printer_opts *opts = to_f_printer_opts(item);
1173 int result, l;
1174
1175 mutex_lock(&opts->lock);
1176 result = strlcpy(opts->pnp_string + 2, page, PNP_STRING_LEN - 2);
1177 l = strlen(opts->pnp_string + 2) + 2;
1178 opts->pnp_string[0] = (l >> 8) & 0xFF;
1179 opts->pnp_string[1] = l & 0xFF;
1180 mutex_unlock(&opts->lock);
1181
1182 return result;
1183 }
1184
1185 CONFIGFS_ATTR(f_printer_opts_, pnp_string);
1186
1187 static ssize_t f_printer_opts_q_len_show(struct config_item *item,
1188 char *page)
1189 {
1190 struct f_printer_opts *opts = to_f_printer_opts(item);
1191 int result;
1192
1193 mutex_lock(&opts->lock);
1194 result = sprintf(page, "%d\n", opts->q_len);
1195 mutex_unlock(&opts->lock);
1196
1197 return result;
1198 }
1199
1200 static ssize_t f_printer_opts_q_len_store(struct config_item *item,
1201 const char *page, size_t len)
1202 {
1203 struct f_printer_opts *opts = to_f_printer_opts(item);
1204 int ret;
1205 u16 num;
1206
1207 mutex_lock(&opts->lock);
1208 if (opts->refcnt) {
1209 ret = -EBUSY;
1210 goto end;
1211 }
1212
1213 ret = kstrtou16(page, 0, &num);
1214 if (ret)
1215 goto end;
1216
1217 opts->q_len = (unsigned)num;
1218 ret = len;
1219 end:
1220 mutex_unlock(&opts->lock);
1221 return ret;
1222 }
1223
1224 CONFIGFS_ATTR(f_printer_opts_, q_len);
1225
1226 static struct configfs_attribute *printer_attrs[] = {
1227 &f_printer_opts_attr_pnp_string,
1228 &f_printer_opts_attr_q_len,
1229 NULL,
1230 };
1231
1232 static struct config_item_type printer_func_type = {
1233 .ct_item_ops = &printer_item_ops,
1234 .ct_attrs = printer_attrs,
1235 .ct_owner = THIS_MODULE,
1236 };
1237
1238 static inline int gprinter_get_minor(void)
1239 {
1240 int ret;
1241
1242 ret = ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL);
1243 if (ret >= PRINTER_MINORS) {
1244 ida_simple_remove(&printer_ida, ret);
1245 ret = -ENODEV;
1246 }
1247
1248 return ret;
1249 }
1250
1251 static inline void gprinter_put_minor(int minor)
1252 {
1253 ida_simple_remove(&printer_ida, minor);
1254 }
1255
1256 static int gprinter_setup(int);
1257 static void gprinter_cleanup(void);
1258
1259 static void gprinter_free_inst(struct usb_function_instance *f)
1260 {
1261 struct f_printer_opts *opts;
1262
1263 opts = container_of(f, struct f_printer_opts, func_inst);
1264
1265 mutex_lock(&printer_ida_lock);
1266
1267 gprinter_put_minor(opts->minor);
1268 if (idr_is_empty(&printer_ida.idr))
1269 gprinter_cleanup();
1270
1271 mutex_unlock(&printer_ida_lock);
1272
1273 kfree(opts);
1274 }
1275
1276 static struct usb_function_instance *gprinter_alloc_inst(void)
1277 {
1278 struct f_printer_opts *opts;
1279 struct usb_function_instance *ret;
1280 int status = 0;
1281
1282 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1283 if (!opts)
1284 return ERR_PTR(-ENOMEM);
1285
1286 mutex_init(&opts->lock);
1287 opts->func_inst.free_func_inst = gprinter_free_inst;
1288 ret = &opts->func_inst;
1289
1290 mutex_lock(&printer_ida_lock);
1291
1292 if (idr_is_empty(&printer_ida.idr)) {
1293 status = gprinter_setup(PRINTER_MINORS);
1294 if (status) {
1295 ret = ERR_PTR(status);
1296 kfree(opts);
1297 goto unlock;
1298 }
1299 }
1300
1301 opts->minor = gprinter_get_minor();
1302 if (opts->minor < 0) {
1303 ret = ERR_PTR(opts->minor);
1304 kfree(opts);
1305 if (idr_is_empty(&printer_ida.idr))
1306 gprinter_cleanup();
1307 goto unlock;
1308 }
1309 config_group_init_type_name(&opts->func_inst.group, "",
1310 &printer_func_type);
1311
1312 unlock:
1313 mutex_unlock(&printer_ida_lock);
1314 return ret;
1315 }
1316
1317 static void gprinter_free(struct usb_function *f)
1318 {
1319 struct printer_dev *dev = func_to_printer(f);
1320 struct f_printer_opts *opts;
1321
1322 opts = container_of(f->fi, struct f_printer_opts, func_inst);
1323 kfree(dev);
1324 mutex_lock(&opts->lock);
1325 --opts->refcnt;
1326 mutex_unlock(&opts->lock);
1327 }
1328
1329 static void printer_func_unbind(struct usb_configuration *c,
1330 struct usb_function *f)
1331 {
1332 struct printer_dev *dev;
1333 struct usb_request *req;
1334
1335 dev = func_to_printer(f);
1336
1337 device_destroy(usb_gadget_class, MKDEV(major, dev->minor));
1338
1339 /* Remove Character Device */
1340 cdev_del(&dev->printer_cdev);
1341
1342 /* we must already have been disconnected ... no i/o may be active */
1343 WARN_ON(!list_empty(&dev->tx_reqs_active));
1344 WARN_ON(!list_empty(&dev->rx_reqs_active));
1345
1346 /* Free all memory for this driver. */
1347 while (!list_empty(&dev->tx_reqs)) {
1348 req = container_of(dev->tx_reqs.next, struct usb_request,
1349 list);
1350 list_del(&req->list);
1351 printer_req_free(dev->in_ep, req);
1352 }
1353
1354 if (dev->current_rx_req != NULL)
1355 printer_req_free(dev->out_ep, dev->current_rx_req);
1356
1357 while (!list_empty(&dev->rx_reqs)) {
1358 req = container_of(dev->rx_reqs.next,
1359 struct usb_request, list);
1360 list_del(&req->list);
1361 printer_req_free(dev->out_ep, req);
1362 }
1363
1364 while (!list_empty(&dev->rx_buffers)) {
1365 req = container_of(dev->rx_buffers.next,
1366 struct usb_request, list);
1367 list_del(&req->list);
1368 printer_req_free(dev->out_ep, req);
1369 }
1370 usb_free_all_descriptors(f);
1371 }
1372
1373 static struct usb_function *gprinter_alloc(struct usb_function_instance *fi)
1374 {
1375 struct printer_dev *dev;
1376 struct f_printer_opts *opts;
1377
1378 opts = container_of(fi, struct f_printer_opts, func_inst);
1379
1380 mutex_lock(&opts->lock);
1381 if (opts->minor >= minors) {
1382 mutex_unlock(&opts->lock);
1383 return ERR_PTR(-ENOENT);
1384 }
1385
1386 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1387 if (!dev) {
1388 mutex_unlock(&opts->lock);
1389 return ERR_PTR(-ENOMEM);
1390 }
1391
1392 ++opts->refcnt;
1393 dev->minor = opts->minor;
1394 dev->pnp_string = opts->pnp_string;
1395 dev->q_len = opts->q_len;
1396 mutex_unlock(&opts->lock);
1397
1398 dev->function.name = "printer";
1399 dev->function.bind = printer_func_bind;
1400 dev->function.setup = printer_func_setup;
1401 dev->function.unbind = printer_func_unbind;
1402 dev->function.set_alt = printer_func_set_alt;
1403 dev->function.disable = printer_func_disable;
1404 dev->function.req_match = gprinter_req_match;
1405 dev->function.free_func = gprinter_free;
1406
1407 INIT_LIST_HEAD(&dev->tx_reqs);
1408 INIT_LIST_HEAD(&dev->rx_reqs);
1409 INIT_LIST_HEAD(&dev->rx_buffers);
1410 INIT_LIST_HEAD(&dev->tx_reqs_active);
1411 INIT_LIST_HEAD(&dev->rx_reqs_active);
1412
1413 spin_lock_init(&dev->lock);
1414 mutex_init(&dev->lock_printer_io);
1415 init_waitqueue_head(&dev->rx_wait);
1416 init_waitqueue_head(&dev->tx_wait);
1417 init_waitqueue_head(&dev->tx_flush_wait);
1418
1419 dev->interface = -1;
1420 dev->printer_cdev_open = 0;
1421 dev->printer_status = PRINTER_NOT_ERROR;
1422 dev->current_rx_req = NULL;
1423 dev->current_rx_bytes = 0;
1424 dev->current_rx_buf = NULL;
1425
1426 return &dev->function;
1427 }
1428
1429 DECLARE_USB_FUNCTION_INIT(printer, gprinter_alloc_inst, gprinter_alloc);
1430 MODULE_LICENSE("GPL");
1431 MODULE_AUTHOR("Craig Nadler");
1432
1433 static int gprinter_setup(int count)
1434 {
1435 int status;
1436 dev_t devt;
1437
1438 usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1439 if (IS_ERR(usb_gadget_class)) {
1440 status = PTR_ERR(usb_gadget_class);
1441 usb_gadget_class = NULL;
1442 pr_err("unable to create usb_gadget class %d\n", status);
1443 return status;
1444 }
1445
1446 status = alloc_chrdev_region(&devt, 0, count, "USB printer gadget");
1447 if (status) {
1448 pr_err("alloc_chrdev_region %d\n", status);
1449 class_destroy(usb_gadget_class);
1450 usb_gadget_class = NULL;
1451 return status;
1452 }
1453
1454 major = MAJOR(devt);
1455 minors = count;
1456
1457 return status;
1458 }
1459
1460 static void gprinter_cleanup(void)
1461 {
1462 if (major) {
1463 unregister_chrdev_region(MKDEV(major, 0), minors);
1464 major = minors = 0;
1465 }
1466 class_destroy(usb_gadget_class);
1467 usb_gadget_class = NULL;
1468 }
Linux with added FPC-III support