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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * f_printer.c - USB printer function driver
4 *
5 * Copied from drivers/usb/gadget/legacy/printer.c,
6 * which was:
7 *
8 * printer.c -- Printer gadget driver
9 *
10 * Copyright (C) 2003-2005 David Brownell
11 * Copyright (C) 2006 Craig W. Nadler
12 */
13
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/delay.h>
17#include <linux/ioport.h>
18#include <linux/sched.h>
19#include <linux/slab.h>
20#include <linux/mutex.h>
21#include <linux/errno.h>
22#include <linux/init.h>
23#include <linux/idr.h>
24#include <linux/timer.h>
25#include <linux/list.h>
26#include <linux/interrupt.h>
27#include <linux/device.h>
28#include <linux/moduleparam.h>
29#include <linux/fs.h>
30#include <linux/poll.h>
31#include <linux/types.h>
32#include <linux/ctype.h>
33#include <linux/cdev.h>
34#include <linux/kref.h>
35
36#include <asm/byteorder.h>
37#include <linux/io.h>
38#include <linux/irq.h>
39#include <linux/uaccess.h>
40#include <asm/unaligned.h>
41
42#include <linux/usb/ch9.h>
43#include <linux/usb/composite.h>
44#include <linux/usb/gadget.h>
45#include <linux/usb/g_printer.h>
46
47#include "u_printer.h"
48
49#define PRINTER_MINORS 4
50#define GET_DEVICE_ID 0
51#define GET_PORT_STATUS 1
52#define SOFT_RESET 2
53
54#define DEFAULT_Q_LEN 10 /* same as legacy g_printer gadget */
55
56static int major, minors;
57static const struct class usb_gadget_class = {
58 .name = "usb_printer_gadget",
59};
60
61static DEFINE_IDA(printer_ida);
62static DEFINE_MUTEX(printer_ida_lock); /* protects access do printer_ida */
63
64/*-------------------------------------------------------------------------*/
65
66struct printer_dev {
67 spinlock_t lock; /* lock this structure */
68 /* lock buffer lists during read/write calls */
69 struct mutex lock_printer_io;
70 struct usb_gadget *gadget;
71 s8 interface;
72 struct usb_ep *in_ep, *out_ep;
73 struct kref kref;
74 struct list_head rx_reqs; /* List of free RX structs */
75 struct list_head rx_reqs_active; /* List of Active RX xfers */
76 struct list_head rx_buffers; /* List of completed xfers */
77 /* wait until there is data to be read. */
78 wait_queue_head_t rx_wait;
79 struct list_head tx_reqs; /* List of free TX structs */
80 struct list_head tx_reqs_active; /* List of Active TX xfers */
81 /* Wait until there are write buffers available to use. */
82 wait_queue_head_t tx_wait;
83 /* Wait until all write buffers have been sent. */
84 wait_queue_head_t tx_flush_wait;
85 struct usb_request *current_rx_req;
86 size_t current_rx_bytes;
87 u8 *current_rx_buf;
88 u8 printer_status;
89 u8 reset_printer;
90 int minor;
91 struct cdev printer_cdev;
92 u8 printer_cdev_open;
93 wait_queue_head_t wait;
94 unsigned q_len;
95 char **pnp_string; /* We don't own memory! */
96 struct usb_function function;
97};
98
99static inline struct printer_dev *func_to_printer(struct usb_function *f)
100{
101 return container_of(f, struct printer_dev, function);
102}
103
104/*-------------------------------------------------------------------------*/
105
106/*
107 * DESCRIPTORS ... most are static, but strings and (full) configuration
108 * descriptors are built on demand.
109 */
110
111/* holds our biggest descriptor */
112#define USB_DESC_BUFSIZE 256
113#define USB_BUFSIZE 8192
114
115static struct usb_interface_descriptor intf_desc = {
116 .bLength = sizeof(intf_desc),
117 .bDescriptorType = USB_DT_INTERFACE,
118 .bNumEndpoints = 2,
119 .bInterfaceClass = USB_CLASS_PRINTER,
120 .bInterfaceSubClass = 1, /* Printer Sub-Class */
121 .bInterfaceProtocol = 2, /* Bi-Directional */
122 .iInterface = 0
123};
124
125static struct usb_endpoint_descriptor fs_ep_in_desc = {
126 .bLength = USB_DT_ENDPOINT_SIZE,
127 .bDescriptorType = USB_DT_ENDPOINT,
128 .bEndpointAddress = USB_DIR_IN,
129 .bmAttributes = USB_ENDPOINT_XFER_BULK
130};
131
132static struct usb_endpoint_descriptor fs_ep_out_desc = {
133 .bLength = USB_DT_ENDPOINT_SIZE,
134 .bDescriptorType = USB_DT_ENDPOINT,
135 .bEndpointAddress = USB_DIR_OUT,
136 .bmAttributes = USB_ENDPOINT_XFER_BULK
137};
138
139static struct usb_descriptor_header *fs_printer_function[] = {
140 (struct usb_descriptor_header *) &intf_desc,
141 (struct usb_descriptor_header *) &fs_ep_in_desc,
142 (struct usb_descriptor_header *) &fs_ep_out_desc,
143 NULL
144};
145
146/*
147 * usb 2.0 devices need to expose both high speed and full speed
148 * descriptors, unless they only run at full speed.
149 */
150
151static struct usb_endpoint_descriptor hs_ep_in_desc = {
152 .bLength = USB_DT_ENDPOINT_SIZE,
153 .bDescriptorType = USB_DT_ENDPOINT,
154 .bmAttributes = USB_ENDPOINT_XFER_BULK,
155 .wMaxPacketSize = cpu_to_le16(512)
156};
157
158static struct usb_endpoint_descriptor hs_ep_out_desc = {
159 .bLength = USB_DT_ENDPOINT_SIZE,
160 .bDescriptorType = USB_DT_ENDPOINT,
161 .bmAttributes = USB_ENDPOINT_XFER_BULK,
162 .wMaxPacketSize = cpu_to_le16(512)
163};
164
165static struct usb_descriptor_header *hs_printer_function[] = {
166 (struct usb_descriptor_header *) &intf_desc,
167 (struct usb_descriptor_header *) &hs_ep_in_desc,
168 (struct usb_descriptor_header *) &hs_ep_out_desc,
169 NULL
170};
171
172/*
173 * Added endpoint descriptors for 3.0 devices
174 */
175
176static struct usb_endpoint_descriptor ss_ep_in_desc = {
177 .bLength = USB_DT_ENDPOINT_SIZE,
178 .bDescriptorType = USB_DT_ENDPOINT,
179 .bmAttributes = USB_ENDPOINT_XFER_BULK,
180 .wMaxPacketSize = cpu_to_le16(1024),
181};
182
183static struct usb_ss_ep_comp_descriptor ss_ep_in_comp_desc = {
184 .bLength = sizeof(ss_ep_in_comp_desc),
185 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
186};
187
188static struct usb_endpoint_descriptor ss_ep_out_desc = {
189 .bLength = USB_DT_ENDPOINT_SIZE,
190 .bDescriptorType = USB_DT_ENDPOINT,
191 .bmAttributes = USB_ENDPOINT_XFER_BULK,
192 .wMaxPacketSize = cpu_to_le16(1024),
193};
194
195static struct usb_ss_ep_comp_descriptor ss_ep_out_comp_desc = {
196 .bLength = sizeof(ss_ep_out_comp_desc),
197 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
198};
199
200static struct usb_descriptor_header *ss_printer_function[] = {
201 (struct usb_descriptor_header *) &intf_desc,
202 (struct usb_descriptor_header *) &ss_ep_in_desc,
203 (struct usb_descriptor_header *) &ss_ep_in_comp_desc,
204 (struct usb_descriptor_header *) &ss_ep_out_desc,
205 (struct usb_descriptor_header *) &ss_ep_out_comp_desc,
206 NULL
207};
208
209/* maxpacket and other transfer characteristics vary by speed. */
210static inline struct usb_endpoint_descriptor *ep_desc(struct usb_gadget *gadget,
211 struct usb_endpoint_descriptor *fs,
212 struct usb_endpoint_descriptor *hs,
213 struct usb_endpoint_descriptor *ss)
214{
215 switch (gadget->speed) {
216 case USB_SPEED_SUPER:
217 return ss;
218 case USB_SPEED_HIGH:
219 return hs;
220 default:
221 return fs;
222 }
223}
224
225/*-------------------------------------------------------------------------*/
226
227static void printer_dev_free(struct kref *kref)
228{
229 struct printer_dev *dev = container_of(kref, struct printer_dev, kref);
230
231 kfree(dev);
232}
233
234static struct usb_request *
235printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
236{
237 struct usb_request *req;
238
239 req = usb_ep_alloc_request(ep, gfp_flags);
240
241 if (req != NULL) {
242 req->length = len;
243 req->buf = kmalloc(len, gfp_flags);
244 if (req->buf == NULL) {
245 usb_ep_free_request(ep, req);
246 return NULL;
247 }
248 }
249
250 return req;
251}
252
253static void
254printer_req_free(struct usb_ep *ep, struct usb_request *req)
255{
256 if (ep != NULL && req != NULL) {
257 kfree(req->buf);
258 usb_ep_free_request(ep, req);
259 }
260}
261
262/*-------------------------------------------------------------------------*/
263
264static void rx_complete(struct usb_ep *ep, struct usb_request *req)
265{
266 struct printer_dev *dev = ep->driver_data;
267 int status = req->status;
268 unsigned long flags;
269
270 spin_lock_irqsave(&dev->lock, flags);
271
272 list_del_init(&req->list); /* Remode from Active List */
273
274 switch (status) {
275
276 /* normal completion */
277 case 0:
278 if (req->actual > 0) {
279 list_add_tail(&req->list, &dev->rx_buffers);
280 DBG(dev, "G_Printer : rx length %d\n", req->actual);
281 } else {
282 list_add(&req->list, &dev->rx_reqs);
283 }
284 break;
285
286 /* software-driven interface shutdown */
287 case -ECONNRESET: /* unlink */
288 case -ESHUTDOWN: /* disconnect etc */
289 VDBG(dev, "rx shutdown, code %d\n", status);
290 list_add(&req->list, &dev->rx_reqs);
291 break;
292
293 /* for hardware automagic (such as pxa) */
294 case -ECONNABORTED: /* endpoint reset */
295 DBG(dev, "rx %s reset\n", ep->name);
296 list_add(&req->list, &dev->rx_reqs);
297 break;
298
299 /* data overrun */
300 case -EOVERFLOW:
301 fallthrough;
302
303 default:
304 DBG(dev, "rx status %d\n", status);
305 list_add(&req->list, &dev->rx_reqs);
306 break;
307 }
308
309 wake_up_interruptible(&dev->rx_wait);
310 spin_unlock_irqrestore(&dev->lock, flags);
311}
312
313static void tx_complete(struct usb_ep *ep, struct usb_request *req)
314{
315 struct printer_dev *dev = ep->driver_data;
316
317 switch (req->status) {
318 default:
319 VDBG(dev, "tx err %d\n", req->status);
320 fallthrough;
321 case -ECONNRESET: /* unlink */
322 case -ESHUTDOWN: /* disconnect etc */
323 break;
324 case 0:
325 break;
326 }
327
328 spin_lock(&dev->lock);
329 /* Take the request struct off the active list and put it on the
330 * free list.
331 */
332 list_del_init(&req->list);
333 list_add(&req->list, &dev->tx_reqs);
334 wake_up_interruptible(&dev->tx_wait);
335 if (likely(list_empty(&dev->tx_reqs_active)))
336 wake_up_interruptible(&dev->tx_flush_wait);
337
338 spin_unlock(&dev->lock);
339}
340
341/*-------------------------------------------------------------------------*/
342
343static int
344printer_open(struct inode *inode, struct file *fd)
345{
346 struct printer_dev *dev;
347 unsigned long flags;
348 int ret = -EBUSY;
349
350 dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
351
352 spin_lock_irqsave(&dev->lock, flags);
353
354 if (dev->interface < 0) {
355 spin_unlock_irqrestore(&dev->lock, flags);
356 return -ENODEV;
357 }
358
359 if (!dev->printer_cdev_open) {
360 dev->printer_cdev_open = 1;
361 fd->private_data = dev;
362 ret = 0;
363 /* Change the printer status to show that it's on-line. */
364 dev->printer_status |= PRINTER_SELECTED;
365 }
366
367 spin_unlock_irqrestore(&dev->lock, flags);
368
369 kref_get(&dev->kref);
370
371 return ret;
372}
373
374static int
375printer_close(struct inode *inode, struct file *fd)
376{
377 struct printer_dev *dev = fd->private_data;
378 unsigned long flags;
379
380 spin_lock_irqsave(&dev->lock, flags);
381 dev->printer_cdev_open = 0;
382 fd->private_data = NULL;
383 /* Change printer status to show that the printer is off-line. */
384 dev->printer_status &= ~PRINTER_SELECTED;
385 spin_unlock_irqrestore(&dev->lock, flags);
386
387 kref_put(&dev->kref, printer_dev_free);
388
389 return 0;
390}
391
392/* This function must be called with interrupts turned off. */
393static void
394setup_rx_reqs(struct printer_dev *dev)
395{
396 struct usb_request *req;
397
398 while (likely(!list_empty(&dev->rx_reqs))) {
399 int error;
400
401 req = container_of(dev->rx_reqs.next,
402 struct usb_request, list);
403 list_del_init(&req->list);
404
405 /* The USB Host sends us whatever amount of data it wants to
406 * so we always set the length field to the full USB_BUFSIZE.
407 * If the amount of data is more than the read() caller asked
408 * for it will be stored in the request buffer until it is
409 * asked for by read().
410 */
411 req->length = USB_BUFSIZE;
412 req->complete = rx_complete;
413
414 /* here, we unlock, and only unlock, to avoid deadlock. */
415 spin_unlock(&dev->lock);
416 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
417 spin_lock(&dev->lock);
418 if (error) {
419 DBG(dev, "rx submit --> %d\n", error);
420 list_add(&req->list, &dev->rx_reqs);
421 break;
422 }
423 /* if the req is empty, then add it into dev->rx_reqs_active. */
424 else if (list_empty(&req->list))
425 list_add(&req->list, &dev->rx_reqs_active);
426 }
427}
428
429static ssize_t
430printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
431{
432 struct printer_dev *dev = fd->private_data;
433 unsigned long flags;
434 size_t size;
435 size_t bytes_copied;
436 struct usb_request *req;
437 /* This is a pointer to the current USB rx request. */
438 struct usb_request *current_rx_req;
439 /* This is the number of bytes in the current rx buffer. */
440 size_t current_rx_bytes;
441 /* This is a pointer to the current rx buffer. */
442 u8 *current_rx_buf;
443
444 if (len == 0)
445 return -EINVAL;
446
447 DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
448
449 mutex_lock(&dev->lock_printer_io);
450 spin_lock_irqsave(&dev->lock, flags);
451
452 if (dev->interface < 0) {
453 spin_unlock_irqrestore(&dev->lock, flags);
454 mutex_unlock(&dev->lock_printer_io);
455 return -ENODEV;
456 }
457
458 /* We will use this flag later to check if a printer reset happened
459 * after we turn interrupts back on.
460 */
461 dev->reset_printer = 0;
462
463 setup_rx_reqs(dev);
464
465 bytes_copied = 0;
466 current_rx_req = dev->current_rx_req;
467 current_rx_bytes = dev->current_rx_bytes;
468 current_rx_buf = dev->current_rx_buf;
469 dev->current_rx_req = NULL;
470 dev->current_rx_bytes = 0;
471 dev->current_rx_buf = NULL;
472
473 /* Check if there is any data in the read buffers. Please note that
474 * current_rx_bytes is the number of bytes in the current rx buffer.
475 * If it is zero then check if there are any other rx_buffers that
476 * are on the completed list. We are only out of data if all rx
477 * buffers are empty.
478 */
479 if ((current_rx_bytes == 0) &&
480 (likely(list_empty(&dev->rx_buffers)))) {
481 /* Turn interrupts back on before sleeping. */
482 spin_unlock_irqrestore(&dev->lock, flags);
483
484 /*
485 * If no data is available check if this is a NON-Blocking
486 * call or not.
487 */
488 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
489 mutex_unlock(&dev->lock_printer_io);
490 return -EAGAIN;
491 }
492
493 /* Sleep until data is available */
494 wait_event_interruptible(dev->rx_wait,
495 (likely(!list_empty(&dev->rx_buffers))));
496 spin_lock_irqsave(&dev->lock, flags);
497 }
498
499 /* We have data to return then copy it to the caller's buffer.*/
500 while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
501 && len) {
502 if (current_rx_bytes == 0) {
503 req = container_of(dev->rx_buffers.next,
504 struct usb_request, list);
505 list_del_init(&req->list);
506
507 if (req->actual && req->buf) {
508 current_rx_req = req;
509 current_rx_bytes = req->actual;
510 current_rx_buf = req->buf;
511 } else {
512 list_add(&req->list, &dev->rx_reqs);
513 continue;
514 }
515 }
516
517 /* Don't leave irqs off while doing memory copies */
518 spin_unlock_irqrestore(&dev->lock, flags);
519
520 if (len > current_rx_bytes)
521 size = current_rx_bytes;
522 else
523 size = len;
524
525 size -= copy_to_user(buf, current_rx_buf, size);
526 bytes_copied += size;
527 len -= size;
528 buf += size;
529
530 spin_lock_irqsave(&dev->lock, flags);
531
532 /* We've disconnected or reset so return. */
533 if (dev->reset_printer) {
534 list_add(¤t_rx_req->list, &dev->rx_reqs);
535 spin_unlock_irqrestore(&dev->lock, flags);
536 mutex_unlock(&dev->lock_printer_io);
537 return -EAGAIN;
538 }
539
540 /* If we not returning all the data left in this RX request
541 * buffer then adjust the amount of data left in the buffer.
542 * Othewise if we are done with this RX request buffer then
543 * requeue it to get any incoming data from the USB host.
544 */
545 if (size < current_rx_bytes) {
546 current_rx_bytes -= size;
547 current_rx_buf += size;
548 } else {
549 list_add(¤t_rx_req->list, &dev->rx_reqs);
550 current_rx_bytes = 0;
551 current_rx_buf = NULL;
552 current_rx_req = NULL;
553 }
554 }
555
556 dev->current_rx_req = current_rx_req;
557 dev->current_rx_bytes = current_rx_bytes;
558 dev->current_rx_buf = current_rx_buf;
559
560 spin_unlock_irqrestore(&dev->lock, flags);
561 mutex_unlock(&dev->lock_printer_io);
562
563 DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
564
565 if (bytes_copied)
566 return bytes_copied;
567 else
568 return -EAGAIN;
569}
570
571static ssize_t
572printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
573{
574 struct printer_dev *dev = fd->private_data;
575 unsigned long flags;
576 size_t size; /* Amount of data in a TX request. */
577 size_t bytes_copied = 0;
578 struct usb_request *req;
579 int value;
580
581 DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
582
583 if (len == 0)
584 return -EINVAL;
585
586 mutex_lock(&dev->lock_printer_io);
587 spin_lock_irqsave(&dev->lock, flags);
588
589 if (dev->interface < 0) {
590 spin_unlock_irqrestore(&dev->lock, flags);
591 mutex_unlock(&dev->lock_printer_io);
592 return -ENODEV;
593 }
594
595 /* Check if a printer reset happens while we have interrupts on */
596 dev->reset_printer = 0;
597
598 /* Check if there is any available write buffers */
599 if (likely(list_empty(&dev->tx_reqs))) {
600 /* Turn interrupts back on before sleeping. */
601 spin_unlock_irqrestore(&dev->lock, flags);
602
603 /*
604 * If write buffers are available check if this is
605 * a NON-Blocking call or not.
606 */
607 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
608 mutex_unlock(&dev->lock_printer_io);
609 return -EAGAIN;
610 }
611
612 /* Sleep until a write buffer is available */
613 wait_event_interruptible(dev->tx_wait,
614 (likely(!list_empty(&dev->tx_reqs))));
615 spin_lock_irqsave(&dev->lock, flags);
616 }
617
618 while (likely(!list_empty(&dev->tx_reqs)) && len) {
619
620 if (len > USB_BUFSIZE)
621 size = USB_BUFSIZE;
622 else
623 size = len;
624
625 req = container_of(dev->tx_reqs.next, struct usb_request,
626 list);
627 list_del_init(&req->list);
628
629 req->complete = tx_complete;
630 req->length = size;
631
632 /* Check if we need to send a zero length packet. */
633 if (len > size)
634 /* They will be more TX requests so no yet. */
635 req->zero = 0;
636 else
637 /* If the data amount is not a multiple of the
638 * maxpacket size then send a zero length packet.
639 */
640 req->zero = ((len % dev->in_ep->maxpacket) == 0);
641
642 /* Don't leave irqs off while doing memory copies */
643 spin_unlock_irqrestore(&dev->lock, flags);
644
645 if (copy_from_user(req->buf, buf, size)) {
646 list_add(&req->list, &dev->tx_reqs);
647 mutex_unlock(&dev->lock_printer_io);
648 return bytes_copied;
649 }
650
651 bytes_copied += size;
652 len -= size;
653 buf += size;
654
655 spin_lock_irqsave(&dev->lock, flags);
656
657 /* We've disconnected or reset so free the req and buffer */
658 if (dev->reset_printer) {
659 list_add(&req->list, &dev->tx_reqs);
660 spin_unlock_irqrestore(&dev->lock, flags);
661 mutex_unlock(&dev->lock_printer_io);
662 return -EAGAIN;
663 }
664
665 list_add(&req->list, &dev->tx_reqs_active);
666
667 /* here, we unlock, and only unlock, to avoid deadlock. */
668 spin_unlock(&dev->lock);
669 value = usb_ep_queue(dev->in_ep, req, GFP_ATOMIC);
670 spin_lock(&dev->lock);
671 if (value) {
672 list_move(&req->list, &dev->tx_reqs);
673 spin_unlock_irqrestore(&dev->lock, flags);
674 mutex_unlock(&dev->lock_printer_io);
675 return -EAGAIN;
676 }
677 }
678
679 spin_unlock_irqrestore(&dev->lock, flags);
680 mutex_unlock(&dev->lock_printer_io);
681
682 DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
683
684 if (bytes_copied)
685 return bytes_copied;
686 else
687 return -EAGAIN;
688}
689
690static int
691printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync)
692{
693 struct printer_dev *dev = fd->private_data;
694 struct inode *inode = file_inode(fd);
695 unsigned long flags;
696 int tx_list_empty;
697
698 inode_lock(inode);
699 spin_lock_irqsave(&dev->lock, flags);
700
701 if (dev->interface < 0) {
702 spin_unlock_irqrestore(&dev->lock, flags);
703 inode_unlock(inode);
704 return -ENODEV;
705 }
706
707 tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
708 spin_unlock_irqrestore(&dev->lock, flags);
709
710 if (!tx_list_empty) {
711 /* Sleep until all data has been sent */
712 wait_event_interruptible(dev->tx_flush_wait,
713 (likely(list_empty(&dev->tx_reqs_active))));
714 }
715 inode_unlock(inode);
716
717 return 0;
718}
719
720static __poll_t
721printer_poll(struct file *fd, poll_table *wait)
722{
723 struct printer_dev *dev = fd->private_data;
724 unsigned long flags;
725 __poll_t status = 0;
726
727 mutex_lock(&dev->lock_printer_io);
728 spin_lock_irqsave(&dev->lock, flags);
729
730 if (dev->interface < 0) {
731 spin_unlock_irqrestore(&dev->lock, flags);
732 mutex_unlock(&dev->lock_printer_io);
733 return EPOLLERR | EPOLLHUP;
734 }
735
736 setup_rx_reqs(dev);
737 spin_unlock_irqrestore(&dev->lock, flags);
738 mutex_unlock(&dev->lock_printer_io);
739
740 poll_wait(fd, &dev->rx_wait, wait);
741 poll_wait(fd, &dev->tx_wait, wait);
742
743 spin_lock_irqsave(&dev->lock, flags);
744 if (likely(!list_empty(&dev->tx_reqs)))
745 status |= EPOLLOUT | EPOLLWRNORM;
746
747 if (likely(dev->current_rx_bytes) ||
748 likely(!list_empty(&dev->rx_buffers)))
749 status |= EPOLLIN | EPOLLRDNORM;
750
751 spin_unlock_irqrestore(&dev->lock, flags);
752
753 return status;
754}
755
756static long
757printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
758{
759 struct printer_dev *dev = fd->private_data;
760 unsigned long flags;
761 int status = 0;
762
763 DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
764
765 /* handle ioctls */
766
767 spin_lock_irqsave(&dev->lock, flags);
768
769 if (dev->interface < 0) {
770 spin_unlock_irqrestore(&dev->lock, flags);
771 return -ENODEV;
772 }
773
774 switch (code) {
775 case GADGET_GET_PRINTER_STATUS:
776 status = (int)dev->printer_status;
777 break;
778 case GADGET_SET_PRINTER_STATUS:
779 dev->printer_status = (u8)arg;
780 break;
781 default:
782 /* could not handle ioctl */
783 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
784 code);
785 status = -ENOTTY;
786 }
787
788 spin_unlock_irqrestore(&dev->lock, flags);
789
790 return status;
791}
792
793/* used after endpoint configuration */
794static const struct file_operations printer_io_operations = {
795 .owner = THIS_MODULE,
796 .open = printer_open,
797 .read = printer_read,
798 .write = printer_write,
799 .fsync = printer_fsync,
800 .poll = printer_poll,
801 .unlocked_ioctl = printer_ioctl,
802 .release = printer_close,
803 .llseek = noop_llseek,
804};
805
806/*-------------------------------------------------------------------------*/
807
808static int
809set_printer_interface(struct printer_dev *dev)
810{
811 int result = 0;
812
813 dev->in_ep->desc = ep_desc(dev->gadget, &fs_ep_in_desc, &hs_ep_in_desc,
814 &ss_ep_in_desc);
815 dev->in_ep->driver_data = dev;
816
817 dev->out_ep->desc = ep_desc(dev->gadget, &fs_ep_out_desc,
818 &hs_ep_out_desc, &ss_ep_out_desc);
819 dev->out_ep->driver_data = dev;
820
821 result = usb_ep_enable(dev->in_ep);
822 if (result != 0) {
823 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
824 goto done;
825 }
826
827 result = usb_ep_enable(dev->out_ep);
828 if (result != 0) {
829 DBG(dev, "enable %s --> %d\n", dev->out_ep->name, result);
830 goto done;
831 }
832
833done:
834 /* on error, disable any endpoints */
835 if (result != 0) {
836 (void) usb_ep_disable(dev->in_ep);
837 (void) usb_ep_disable(dev->out_ep);
838 dev->in_ep->desc = NULL;
839 dev->out_ep->desc = NULL;
840 }
841
842 /* caller is responsible for cleanup on error */
843 return result;
844}
845
846static void printer_reset_interface(struct printer_dev *dev)
847{
848 unsigned long flags;
849
850 if (dev->interface < 0)
851 return;
852
853 if (dev->in_ep->desc)
854 usb_ep_disable(dev->in_ep);
855
856 if (dev->out_ep->desc)
857 usb_ep_disable(dev->out_ep);
858
859 spin_lock_irqsave(&dev->lock, flags);
860 dev->in_ep->desc = NULL;
861 dev->out_ep->desc = NULL;
862 dev->interface = -1;
863 spin_unlock_irqrestore(&dev->lock, flags);
864}
865
866/* Change our operational Interface. */
867static int set_interface(struct printer_dev *dev, unsigned number)
868{
869 int result = 0;
870
871 /* Free the current interface */
872 printer_reset_interface(dev);
873
874 result = set_printer_interface(dev);
875 if (result)
876 printer_reset_interface(dev);
877 else
878 dev->interface = number;
879
880 if (!result)
881 INFO(dev, "Using interface %x\n", number);
882
883 return result;
884}
885
886static void printer_soft_reset(struct printer_dev *dev)
887{
888 struct usb_request *req;
889
890 if (usb_ep_disable(dev->in_ep))
891 DBG(dev, "Failed to disable USB in_ep\n");
892 if (usb_ep_disable(dev->out_ep))
893 DBG(dev, "Failed to disable USB out_ep\n");
894
895 if (dev->current_rx_req != NULL) {
896 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
897 dev->current_rx_req = NULL;
898 }
899 dev->current_rx_bytes = 0;
900 dev->current_rx_buf = NULL;
901 dev->reset_printer = 1;
902
903 while (likely(!(list_empty(&dev->rx_buffers)))) {
904 req = container_of(dev->rx_buffers.next, struct usb_request,
905 list);
906 list_del_init(&req->list);
907 list_add(&req->list, &dev->rx_reqs);
908 }
909
910 while (likely(!(list_empty(&dev->rx_reqs_active)))) {
911 req = container_of(dev->rx_buffers.next, struct usb_request,
912 list);
913 list_del_init(&req->list);
914 list_add(&req->list, &dev->rx_reqs);
915 }
916
917 while (likely(!(list_empty(&dev->tx_reqs_active)))) {
918 req = container_of(dev->tx_reqs_active.next,
919 struct usb_request, list);
920 list_del_init(&req->list);
921 list_add(&req->list, &dev->tx_reqs);
922 }
923
924 if (usb_ep_enable(dev->in_ep))
925 DBG(dev, "Failed to enable USB in_ep\n");
926 if (usb_ep_enable(dev->out_ep))
927 DBG(dev, "Failed to enable USB out_ep\n");
928
929 wake_up_interruptible(&dev->rx_wait);
930 wake_up_interruptible(&dev->tx_wait);
931 wake_up_interruptible(&dev->tx_flush_wait);
932}
933
934/*-------------------------------------------------------------------------*/
935
936static bool gprinter_req_match(struct usb_function *f,
937 const struct usb_ctrlrequest *ctrl,
938 bool config0)
939{
940 struct printer_dev *dev = func_to_printer(f);
941 u16 w_index = le16_to_cpu(ctrl->wIndex);
942 u16 w_value = le16_to_cpu(ctrl->wValue);
943 u16 w_length = le16_to_cpu(ctrl->wLength);
944
945 if (config0)
946 return false;
947
948 if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE ||
949 (ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
950 return false;
951
952 switch (ctrl->bRequest) {
953 case GET_DEVICE_ID:
954 w_index >>= 8;
955 if (USB_DIR_IN & ctrl->bRequestType)
956 break;
957 return false;
958 case GET_PORT_STATUS:
959 if (!w_value && w_length == 1 &&
960 (USB_DIR_IN & ctrl->bRequestType))
961 break;
962 return false;
963 case SOFT_RESET:
964 if (!w_value && !w_length &&
965 !(USB_DIR_IN & ctrl->bRequestType))
966 break;
967 fallthrough;
968 default:
969 return false;
970 }
971 return w_index == dev->interface;
972}
973
974/*
975 * The setup() callback implements all the ep0 functionality that's not
976 * handled lower down.
977 */
978static int printer_func_setup(struct usb_function *f,
979 const struct usb_ctrlrequest *ctrl)
980{
981 struct printer_dev *dev = func_to_printer(f);
982 struct usb_composite_dev *cdev = f->config->cdev;
983 struct usb_request *req = cdev->req;
984 u8 *buf = req->buf;
985 int value = -EOPNOTSUPP;
986 u16 wIndex = le16_to_cpu(ctrl->wIndex);
987 u16 wValue = le16_to_cpu(ctrl->wValue);
988 u16 wLength = le16_to_cpu(ctrl->wLength);
989
990 DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
991 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
992
993 switch (ctrl->bRequestType&USB_TYPE_MASK) {
994 case USB_TYPE_CLASS:
995 switch (ctrl->bRequest) {
996 case GET_DEVICE_ID: /* Get the IEEE-1284 PNP String */
997 /* Only one printer interface is supported. */
998 if ((wIndex>>8) != dev->interface)
999 break;
1000
1001 if (!*dev->pnp_string) {
1002 value = 0;
1003 break;
1004 }
1005 value = strlen(*dev->pnp_string);
1006 buf[0] = (value >> 8) & 0xFF;
1007 buf[1] = value & 0xFF;
1008 memcpy(buf + 2, *dev->pnp_string, value);
1009 DBG(dev, "1284 PNP String: %x %s\n", value,
1010 *dev->pnp_string);
1011 break;
1012
1013 case GET_PORT_STATUS: /* Get Port Status */
1014 /* Only one printer interface is supported. */
1015 if (wIndex != dev->interface)
1016 break;
1017
1018 buf[0] = dev->printer_status;
1019 value = min_t(u16, wLength, 1);
1020 break;
1021
1022 case SOFT_RESET: /* Soft Reset */
1023 /* Only one printer interface is supported. */
1024 if (wIndex != dev->interface)
1025 break;
1026
1027 printer_soft_reset(dev);
1028
1029 value = 0;
1030 break;
1031
1032 default:
1033 goto unknown;
1034 }
1035 break;
1036
1037 default:
1038unknown:
1039 VDBG(dev,
1040 "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1041 ctrl->bRequestType, ctrl->bRequest,
1042 wValue, wIndex, wLength);
1043 break;
1044 }
1045 /* host either stalls (value < 0) or reports success */
1046 if (value >= 0) {
1047 req->length = value;
1048 req->zero = value < wLength;
1049 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1050 if (value < 0) {
1051 ERROR(dev, "%s:%d Error!\n", __func__, __LINE__);
1052 req->status = 0;
1053 }
1054 }
1055 return value;
1056}
1057
1058static int printer_func_bind(struct usb_configuration *c,
1059 struct usb_function *f)
1060{
1061 struct usb_gadget *gadget = c->cdev->gadget;
1062 struct printer_dev *dev = func_to_printer(f);
1063 struct device *pdev;
1064 struct usb_composite_dev *cdev = c->cdev;
1065 struct usb_ep *in_ep;
1066 struct usb_ep *out_ep = NULL;
1067 struct usb_request *req;
1068 dev_t devt;
1069 int id;
1070 int ret;
1071 u32 i;
1072
1073 id = usb_interface_id(c, f);
1074 if (id < 0)
1075 return id;
1076 intf_desc.bInterfaceNumber = id;
1077
1078 /* finish hookup to lower layer ... */
1079 dev->gadget = gadget;
1080
1081 /* all we really need is bulk IN/OUT */
1082 in_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_in_desc);
1083 if (!in_ep) {
1084autoconf_fail:
1085 dev_err(&cdev->gadget->dev, "can't autoconfigure on %s\n",
1086 cdev->gadget->name);
1087 return -ENODEV;
1088 }
1089
1090 out_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_out_desc);
1091 if (!out_ep)
1092 goto autoconf_fail;
1093
1094 /* assumes that all endpoints are dual-speed */
1095 hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1096 hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1097 ss_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1098 ss_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1099
1100 ret = usb_assign_descriptors(f, fs_printer_function,
1101 hs_printer_function, ss_printer_function,
1102 ss_printer_function);
1103 if (ret)
1104 return ret;
1105
1106 dev->in_ep = in_ep;
1107 dev->out_ep = out_ep;
1108
1109 ret = -ENOMEM;
1110 for (i = 0; i < dev->q_len; i++) {
1111 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1112 if (!req)
1113 goto fail_tx_reqs;
1114 list_add(&req->list, &dev->tx_reqs);
1115 }
1116
1117 for (i = 0; i < dev->q_len; i++) {
1118 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1119 if (!req)
1120 goto fail_rx_reqs;
1121 list_add(&req->list, &dev->rx_reqs);
1122 }
1123
1124 /* Setup the sysfs files for the printer gadget. */
1125 devt = MKDEV(major, dev->minor);
1126 pdev = device_create(&usb_gadget_class, NULL, devt,
1127 NULL, "g_printer%d", dev->minor);
1128 if (IS_ERR(pdev)) {
1129 ERROR(dev, "Failed to create device: g_printer\n");
1130 ret = PTR_ERR(pdev);
1131 goto fail_rx_reqs;
1132 }
1133
1134 /*
1135 * Register a character device as an interface to a user mode
1136 * program that handles the printer specific functionality.
1137 */
1138 cdev_init(&dev->printer_cdev, &printer_io_operations);
1139 dev->printer_cdev.owner = THIS_MODULE;
1140 ret = cdev_add(&dev->printer_cdev, devt, 1);
1141 if (ret) {
1142 ERROR(dev, "Failed to open char device\n");
1143 goto fail_cdev_add;
1144 }
1145
1146 return 0;
1147
1148fail_cdev_add:
1149 device_destroy(&usb_gadget_class, devt);
1150
1151fail_rx_reqs:
1152 while (!list_empty(&dev->rx_reqs)) {
1153 req = container_of(dev->rx_reqs.next, struct usb_request, list);
1154 list_del(&req->list);
1155 printer_req_free(dev->out_ep, req);
1156 }
1157
1158fail_tx_reqs:
1159 while (!list_empty(&dev->tx_reqs)) {
1160 req = container_of(dev->tx_reqs.next, struct usb_request, list);
1161 list_del(&req->list);
1162 printer_req_free(dev->in_ep, req);
1163 }
1164
1165 usb_free_all_descriptors(f);
1166 return ret;
1167
1168}
1169
1170static int printer_func_set_alt(struct usb_function *f,
1171 unsigned intf, unsigned alt)
1172{
1173 struct printer_dev *dev = func_to_printer(f);
1174 int ret = -ENOTSUPP;
1175
1176 if (!alt)
1177 ret = set_interface(dev, intf);
1178
1179 return ret;
1180}
1181
1182static void printer_func_disable(struct usb_function *f)
1183{
1184 struct printer_dev *dev = func_to_printer(f);
1185
1186 printer_reset_interface(dev);
1187}
1188
1189static inline struct f_printer_opts
1190*to_f_printer_opts(struct config_item *item)
1191{
1192 return container_of(to_config_group(item), struct f_printer_opts,
1193 func_inst.group);
1194}
1195
1196static void printer_attr_release(struct config_item *item)
1197{
1198 struct f_printer_opts *opts = to_f_printer_opts(item);
1199
1200 usb_put_function_instance(&opts->func_inst);
1201}
1202
1203static struct configfs_item_operations printer_item_ops = {
1204 .release = printer_attr_release,
1205};
1206
1207static ssize_t f_printer_opts_pnp_string_show(struct config_item *item,
1208 char *page)
1209{
1210 struct f_printer_opts *opts = to_f_printer_opts(item);
1211 int result = 0;
1212
1213 mutex_lock(&opts->lock);
1214 if (!opts->pnp_string)
1215 goto unlock;
1216
1217 result = strscpy(page, opts->pnp_string, PAGE_SIZE);
1218 if (result < 1) {
1219 result = PAGE_SIZE;
1220 } else if (page[result - 1] != '\n' && result + 1 < PAGE_SIZE) {
1221 page[result++] = '\n';
1222 page[result] = '\0';
1223 }
1224
1225unlock:
1226 mutex_unlock(&opts->lock);
1227
1228 return result;
1229}
1230
1231static ssize_t f_printer_opts_pnp_string_store(struct config_item *item,
1232 const char *page, size_t len)
1233{
1234 struct f_printer_opts *opts = to_f_printer_opts(item);
1235 char *new_pnp;
1236 int result;
1237
1238 mutex_lock(&opts->lock);
1239
1240 new_pnp = kstrndup(page, len, GFP_KERNEL);
1241 if (!new_pnp) {
1242 result = -ENOMEM;
1243 goto unlock;
1244 }
1245
1246 if (opts->pnp_string_allocated)
1247 kfree(opts->pnp_string);
1248
1249 opts->pnp_string_allocated = true;
1250 opts->pnp_string = new_pnp;
1251 result = len;
1252unlock:
1253 mutex_unlock(&opts->lock);
1254
1255 return result;
1256}
1257
1258CONFIGFS_ATTR(f_printer_opts_, pnp_string);
1259
1260static ssize_t f_printer_opts_q_len_show(struct config_item *item,
1261 char *page)
1262{
1263 struct f_printer_opts *opts = to_f_printer_opts(item);
1264 int result;
1265
1266 mutex_lock(&opts->lock);
1267 result = sprintf(page, "%d\n", opts->q_len);
1268 mutex_unlock(&opts->lock);
1269
1270 return result;
1271}
1272
1273static ssize_t f_printer_opts_q_len_store(struct config_item *item,
1274 const char *page, size_t len)
1275{
1276 struct f_printer_opts *opts = to_f_printer_opts(item);
1277 int ret;
1278 u16 num;
1279
1280 mutex_lock(&opts->lock);
1281 if (opts->refcnt) {
1282 ret = -EBUSY;
1283 goto end;
1284 }
1285
1286 ret = kstrtou16(page, 0, &num);
1287 if (ret)
1288 goto end;
1289
1290 opts->q_len = (unsigned)num;
1291 ret = len;
1292end:
1293 mutex_unlock(&opts->lock);
1294 return ret;
1295}
1296
1297CONFIGFS_ATTR(f_printer_opts_, q_len);
1298
1299static struct configfs_attribute *printer_attrs[] = {
1300 &f_printer_opts_attr_pnp_string,
1301 &f_printer_opts_attr_q_len,
1302 NULL,
1303};
1304
1305static const struct config_item_type printer_func_type = {
1306 .ct_item_ops = &printer_item_ops,
1307 .ct_attrs = printer_attrs,
1308 .ct_owner = THIS_MODULE,
1309};
1310
1311static inline int gprinter_get_minor(void)
1312{
1313 int ret;
1314
1315 ret = ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL);
1316 if (ret >= PRINTER_MINORS) {
1317 ida_simple_remove(&printer_ida, ret);
1318 ret = -ENODEV;
1319 }
1320
1321 return ret;
1322}
1323
1324static inline void gprinter_put_minor(int minor)
1325{
1326 ida_simple_remove(&printer_ida, minor);
1327}
1328
1329static int gprinter_setup(int);
1330static void gprinter_cleanup(void);
1331
1332static void gprinter_free_inst(struct usb_function_instance *f)
1333{
1334 struct f_printer_opts *opts;
1335
1336 opts = container_of(f, struct f_printer_opts, func_inst);
1337
1338 mutex_lock(&printer_ida_lock);
1339
1340 gprinter_put_minor(opts->minor);
1341 if (ida_is_empty(&printer_ida))
1342 gprinter_cleanup();
1343
1344 mutex_unlock(&printer_ida_lock);
1345
1346 if (opts->pnp_string_allocated)
1347 kfree(opts->pnp_string);
1348 kfree(opts);
1349}
1350
1351static struct usb_function_instance *gprinter_alloc_inst(void)
1352{
1353 struct f_printer_opts *opts;
1354 struct usb_function_instance *ret;
1355 int status = 0;
1356
1357 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1358 if (!opts)
1359 return ERR_PTR(-ENOMEM);
1360
1361 mutex_init(&opts->lock);
1362 opts->func_inst.free_func_inst = gprinter_free_inst;
1363 ret = &opts->func_inst;
1364
1365 /* Make sure q_len is initialized, otherwise the bound device can't support read/write! */
1366 opts->q_len = DEFAULT_Q_LEN;
1367
1368 mutex_lock(&printer_ida_lock);
1369
1370 if (ida_is_empty(&printer_ida)) {
1371 status = gprinter_setup(PRINTER_MINORS);
1372 if (status) {
1373 ret = ERR_PTR(status);
1374 kfree(opts);
1375 goto unlock;
1376 }
1377 }
1378
1379 opts->minor = gprinter_get_minor();
1380 if (opts->minor < 0) {
1381 ret = ERR_PTR(opts->minor);
1382 kfree(opts);
1383 if (ida_is_empty(&printer_ida))
1384 gprinter_cleanup();
1385 goto unlock;
1386 }
1387 config_group_init_type_name(&opts->func_inst.group, "",
1388 &printer_func_type);
1389
1390unlock:
1391 mutex_unlock(&printer_ida_lock);
1392 return ret;
1393}
1394
1395static void gprinter_free(struct usb_function *f)
1396{
1397 struct printer_dev *dev = func_to_printer(f);
1398 struct f_printer_opts *opts;
1399
1400 opts = container_of(f->fi, struct f_printer_opts, func_inst);
1401
1402 kref_put(&dev->kref, printer_dev_free);
1403 mutex_lock(&opts->lock);
1404 --opts->refcnt;
1405 mutex_unlock(&opts->lock);
1406}
1407
1408static void printer_func_unbind(struct usb_configuration *c,
1409 struct usb_function *f)
1410{
1411 struct printer_dev *dev;
1412 struct usb_request *req;
1413
1414 dev = func_to_printer(f);
1415
1416 device_destroy(&usb_gadget_class, MKDEV(major, dev->minor));
1417
1418 /* Remove Character Device */
1419 cdev_del(&dev->printer_cdev);
1420
1421 /* we must already have been disconnected ... no i/o may be active */
1422 WARN_ON(!list_empty(&dev->tx_reqs_active));
1423 WARN_ON(!list_empty(&dev->rx_reqs_active));
1424
1425 /* Free all memory for this driver. */
1426 while (!list_empty(&dev->tx_reqs)) {
1427 req = container_of(dev->tx_reqs.next, struct usb_request,
1428 list);
1429 list_del(&req->list);
1430 printer_req_free(dev->in_ep, req);
1431 }
1432
1433 if (dev->current_rx_req != NULL)
1434 printer_req_free(dev->out_ep, dev->current_rx_req);
1435
1436 while (!list_empty(&dev->rx_reqs)) {
1437 req = container_of(dev->rx_reqs.next,
1438 struct usb_request, list);
1439 list_del(&req->list);
1440 printer_req_free(dev->out_ep, req);
1441 }
1442
1443 while (!list_empty(&dev->rx_buffers)) {
1444 req = container_of(dev->rx_buffers.next,
1445 struct usb_request, list);
1446 list_del(&req->list);
1447 printer_req_free(dev->out_ep, req);
1448 }
1449 usb_free_all_descriptors(f);
1450}
1451
1452static struct usb_function *gprinter_alloc(struct usb_function_instance *fi)
1453{
1454 struct printer_dev *dev;
1455 struct f_printer_opts *opts;
1456
1457 opts = container_of(fi, struct f_printer_opts, func_inst);
1458
1459 mutex_lock(&opts->lock);
1460 if (opts->minor >= minors) {
1461 mutex_unlock(&opts->lock);
1462 return ERR_PTR(-ENOENT);
1463 }
1464
1465 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1466 if (!dev) {
1467 mutex_unlock(&opts->lock);
1468 return ERR_PTR(-ENOMEM);
1469 }
1470
1471 kref_init(&dev->kref);
1472 ++opts->refcnt;
1473 dev->minor = opts->minor;
1474 dev->pnp_string = &opts->pnp_string;
1475 dev->q_len = opts->q_len;
1476 mutex_unlock(&opts->lock);
1477
1478 dev->function.name = "printer";
1479 dev->function.bind = printer_func_bind;
1480 dev->function.setup = printer_func_setup;
1481 dev->function.unbind = printer_func_unbind;
1482 dev->function.set_alt = printer_func_set_alt;
1483 dev->function.disable = printer_func_disable;
1484 dev->function.req_match = gprinter_req_match;
1485 dev->function.free_func = gprinter_free;
1486
1487 INIT_LIST_HEAD(&dev->tx_reqs);
1488 INIT_LIST_HEAD(&dev->rx_reqs);
1489 INIT_LIST_HEAD(&dev->rx_buffers);
1490 INIT_LIST_HEAD(&dev->tx_reqs_active);
1491 INIT_LIST_HEAD(&dev->rx_reqs_active);
1492
1493 spin_lock_init(&dev->lock);
1494 mutex_init(&dev->lock_printer_io);
1495 init_waitqueue_head(&dev->rx_wait);
1496 init_waitqueue_head(&dev->tx_wait);
1497 init_waitqueue_head(&dev->tx_flush_wait);
1498
1499 dev->interface = -1;
1500 dev->printer_cdev_open = 0;
1501 dev->printer_status = PRINTER_NOT_ERROR;
1502 dev->current_rx_req = NULL;
1503 dev->current_rx_bytes = 0;
1504 dev->current_rx_buf = NULL;
1505
1506 return &dev->function;
1507}
1508
1509DECLARE_USB_FUNCTION_INIT(printer, gprinter_alloc_inst, gprinter_alloc);
1510MODULE_LICENSE("GPL");
1511MODULE_AUTHOR("Craig Nadler");
1512
1513static int gprinter_setup(int count)
1514{
1515 int status;
1516 dev_t devt;
1517
1518 status = class_register(&usb_gadget_class);
1519 if (status)
1520 return status;
1521
1522 status = alloc_chrdev_region(&devt, 0, count, "USB printer gadget");
1523 if (status) {
1524 pr_err("alloc_chrdev_region %d\n", status);
1525 class_unregister(&usb_gadget_class);
1526 return status;
1527 }
1528
1529 major = MAJOR(devt);
1530 minors = count;
1531
1532 return status;
1533}
1534
1535static void gprinter_cleanup(void)
1536{
1537 if (major) {
1538 unregister_chrdev_region(MKDEV(major, 0), minors);
1539 major = minors = 0;
1540 }
1541 class_unregister(&usb_gadget_class);
1542}
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
58static int major, minors;
59static struct class *usb_gadget_class;
60static DEFINE_IDA(printer_ida);
61static DEFINE_MUTEX(printer_ida_lock); /* protects access do printer_ida */
62
63/*-------------------------------------------------------------------------*/
64
65struct 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
98static 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
114static 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
124static 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
131static 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
138static 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
150static 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
157static 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
164static struct usb_qualifier_descriptor dev_qualifier = {
165 .bLength = sizeof(dev_qualifier),
166 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
167 .bcdUSB = cpu_to_le16(0x0200),
168 .bDeviceClass = USB_CLASS_PRINTER,
169 .bNumConfigurations = 1
170};
171
172static struct usb_descriptor_header *hs_printer_function[] = {
173 (struct usb_descriptor_header *) &intf_desc,
174 (struct usb_descriptor_header *) &hs_ep_in_desc,
175 (struct usb_descriptor_header *) &hs_ep_out_desc,
176 NULL
177};
178
179/*
180 * Added endpoint descriptors for 3.0 devices
181 */
182
183static struct usb_endpoint_descriptor ss_ep_in_desc = {
184 .bLength = USB_DT_ENDPOINT_SIZE,
185 .bDescriptorType = USB_DT_ENDPOINT,
186 .bmAttributes = USB_ENDPOINT_XFER_BULK,
187 .wMaxPacketSize = cpu_to_le16(1024),
188};
189
190static struct usb_ss_ep_comp_descriptor ss_ep_in_comp_desc = {
191 .bLength = sizeof(ss_ep_in_comp_desc),
192 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
193};
194
195static struct usb_endpoint_descriptor ss_ep_out_desc = {
196 .bLength = USB_DT_ENDPOINT_SIZE,
197 .bDescriptorType = USB_DT_ENDPOINT,
198 .bmAttributes = USB_ENDPOINT_XFER_BULK,
199 .wMaxPacketSize = cpu_to_le16(1024),
200};
201
202static struct usb_ss_ep_comp_descriptor ss_ep_out_comp_desc = {
203 .bLength = sizeof(ss_ep_out_comp_desc),
204 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
205};
206
207static struct usb_descriptor_header *ss_printer_function[] = {
208 (struct usb_descriptor_header *) &intf_desc,
209 (struct usb_descriptor_header *) &ss_ep_in_desc,
210 (struct usb_descriptor_header *) &ss_ep_in_comp_desc,
211 (struct usb_descriptor_header *) &ss_ep_out_desc,
212 (struct usb_descriptor_header *) &ss_ep_out_comp_desc,
213 NULL
214};
215
216/* maxpacket and other transfer characteristics vary by speed. */
217static inline struct usb_endpoint_descriptor *ep_desc(struct usb_gadget *gadget,
218 struct usb_endpoint_descriptor *fs,
219 struct usb_endpoint_descriptor *hs,
220 struct usb_endpoint_descriptor *ss)
221{
222 switch (gadget->speed) {
223 case USB_SPEED_SUPER:
224 return ss;
225 case USB_SPEED_HIGH:
226 return hs;
227 default:
228 return fs;
229 }
230}
231
232/*-------------------------------------------------------------------------*/
233
234static struct usb_request *
235printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
236{
237 struct usb_request *req;
238
239 req = usb_ep_alloc_request(ep, gfp_flags);
240
241 if (req != NULL) {
242 req->length = len;
243 req->buf = kmalloc(len, gfp_flags);
244 if (req->buf == NULL) {
245 usb_ep_free_request(ep, req);
246 return NULL;
247 }
248 }
249
250 return req;
251}
252
253static void
254printer_req_free(struct usb_ep *ep, struct usb_request *req)
255{
256 if (ep != NULL && req != NULL) {
257 kfree(req->buf);
258 usb_ep_free_request(ep, req);
259 }
260}
261
262/*-------------------------------------------------------------------------*/
263
264static void rx_complete(struct usb_ep *ep, struct usb_request *req)
265{
266 struct printer_dev *dev = ep->driver_data;
267 int status = req->status;
268 unsigned long flags;
269
270 spin_lock_irqsave(&dev->lock, flags);
271
272 list_del_init(&req->list); /* Remode from Active List */
273
274 switch (status) {
275
276 /* normal completion */
277 case 0:
278 if (req->actual > 0) {
279 list_add_tail(&req->list, &dev->rx_buffers);
280 DBG(dev, "G_Printer : rx length %d\n", req->actual);
281 } else {
282 list_add(&req->list, &dev->rx_reqs);
283 }
284 break;
285
286 /* software-driven interface shutdown */
287 case -ECONNRESET: /* unlink */
288 case -ESHUTDOWN: /* disconnect etc */
289 VDBG(dev, "rx shutdown, code %d\n", status);
290 list_add(&req->list, &dev->rx_reqs);
291 break;
292
293 /* for hardware automagic (such as pxa) */
294 case -ECONNABORTED: /* endpoint reset */
295 DBG(dev, "rx %s reset\n", ep->name);
296 list_add(&req->list, &dev->rx_reqs);
297 break;
298
299 /* data overrun */
300 case -EOVERFLOW:
301 /* FALLTHROUGH */
302
303 default:
304 DBG(dev, "rx status %d\n", status);
305 list_add(&req->list, &dev->rx_reqs);
306 break;
307 }
308
309 wake_up_interruptible(&dev->rx_wait);
310 spin_unlock_irqrestore(&dev->lock, flags);
311}
312
313static void tx_complete(struct usb_ep *ep, struct usb_request *req)
314{
315 struct printer_dev *dev = ep->driver_data;
316
317 switch (req->status) {
318 default:
319 VDBG(dev, "tx err %d\n", req->status);
320 /* FALLTHROUGH */
321 case -ECONNRESET: /* unlink */
322 case -ESHUTDOWN: /* disconnect etc */
323 break;
324 case 0:
325 break;
326 }
327
328 spin_lock(&dev->lock);
329 /* Take the request struct off the active list and put it on the
330 * free list.
331 */
332 list_del_init(&req->list);
333 list_add(&req->list, &dev->tx_reqs);
334 wake_up_interruptible(&dev->tx_wait);
335 if (likely(list_empty(&dev->tx_reqs_active)))
336 wake_up_interruptible(&dev->tx_flush_wait);
337
338 spin_unlock(&dev->lock);
339}
340
341/*-------------------------------------------------------------------------*/
342
343static int
344printer_open(struct inode *inode, struct file *fd)
345{
346 struct printer_dev *dev;
347 unsigned long flags;
348 int ret = -EBUSY;
349
350 dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
351
352 spin_lock_irqsave(&dev->lock, flags);
353
354 if (!dev->printer_cdev_open) {
355 dev->printer_cdev_open = 1;
356 fd->private_data = dev;
357 ret = 0;
358 /* Change the printer status to show that it's on-line. */
359 dev->printer_status |= PRINTER_SELECTED;
360 }
361
362 spin_unlock_irqrestore(&dev->lock, flags);
363
364 DBG(dev, "printer_open returned %x\n", ret);
365 return ret;
366}
367
368static int
369printer_close(struct inode *inode, struct file *fd)
370{
371 struct printer_dev *dev = fd->private_data;
372 unsigned long flags;
373
374 spin_lock_irqsave(&dev->lock, flags);
375 dev->printer_cdev_open = 0;
376 fd->private_data = NULL;
377 /* Change printer status to show that the printer is off-line. */
378 dev->printer_status &= ~PRINTER_SELECTED;
379 spin_unlock_irqrestore(&dev->lock, flags);
380
381 DBG(dev, "printer_close\n");
382
383 return 0;
384}
385
386/* This function must be called with interrupts turned off. */
387static void
388setup_rx_reqs(struct printer_dev *dev)
389{
390 struct usb_request *req;
391
392 while (likely(!list_empty(&dev->rx_reqs))) {
393 int error;
394
395 req = container_of(dev->rx_reqs.next,
396 struct usb_request, list);
397 list_del_init(&req->list);
398
399 /* The USB Host sends us whatever amount of data it wants to
400 * so we always set the length field to the full USB_BUFSIZE.
401 * If the amount of data is more than the read() caller asked
402 * for it will be stored in the request buffer until it is
403 * asked for by read().
404 */
405 req->length = USB_BUFSIZE;
406 req->complete = rx_complete;
407
408 /* here, we unlock, and only unlock, to avoid deadlock. */
409 spin_unlock(&dev->lock);
410 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
411 spin_lock(&dev->lock);
412 if (error) {
413 DBG(dev, "rx submit --> %d\n", error);
414 list_add(&req->list, &dev->rx_reqs);
415 break;
416 }
417 /* if the req is empty, then add it into dev->rx_reqs_active. */
418 else if (list_empty(&req->list))
419 list_add(&req->list, &dev->rx_reqs_active);
420 }
421}
422
423static ssize_t
424printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
425{
426 struct printer_dev *dev = fd->private_data;
427 unsigned long flags;
428 size_t size;
429 size_t bytes_copied;
430 struct usb_request *req;
431 /* This is a pointer to the current USB rx request. */
432 struct usb_request *current_rx_req;
433 /* This is the number of bytes in the current rx buffer. */
434 size_t current_rx_bytes;
435 /* This is a pointer to the current rx buffer. */
436 u8 *current_rx_buf;
437
438 if (len == 0)
439 return -EINVAL;
440
441 DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
442
443 mutex_lock(&dev->lock_printer_io);
444 spin_lock_irqsave(&dev->lock, flags);
445
446 /* We will use this flag later to check if a printer reset happened
447 * after we turn interrupts back on.
448 */
449 dev->reset_printer = 0;
450
451 setup_rx_reqs(dev);
452
453 bytes_copied = 0;
454 current_rx_req = dev->current_rx_req;
455 current_rx_bytes = dev->current_rx_bytes;
456 current_rx_buf = dev->current_rx_buf;
457 dev->current_rx_req = NULL;
458 dev->current_rx_bytes = 0;
459 dev->current_rx_buf = NULL;
460
461 /* Check if there is any data in the read buffers. Please note that
462 * current_rx_bytes is the number of bytes in the current rx buffer.
463 * If it is zero then check if there are any other rx_buffers that
464 * are on the completed list. We are only out of data if all rx
465 * buffers are empty.
466 */
467 if ((current_rx_bytes == 0) &&
468 (likely(list_empty(&dev->rx_buffers)))) {
469 /* Turn interrupts back on before sleeping. */
470 spin_unlock_irqrestore(&dev->lock, flags);
471
472 /*
473 * If no data is available check if this is a NON-Blocking
474 * call or not.
475 */
476 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
477 mutex_unlock(&dev->lock_printer_io);
478 return -EAGAIN;
479 }
480
481 /* Sleep until data is available */
482 wait_event_interruptible(dev->rx_wait,
483 (likely(!list_empty(&dev->rx_buffers))));
484 spin_lock_irqsave(&dev->lock, flags);
485 }
486
487 /* We have data to return then copy it to the caller's buffer.*/
488 while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
489 && len) {
490 if (current_rx_bytes == 0) {
491 req = container_of(dev->rx_buffers.next,
492 struct usb_request, list);
493 list_del_init(&req->list);
494
495 if (req->actual && req->buf) {
496 current_rx_req = req;
497 current_rx_bytes = req->actual;
498 current_rx_buf = req->buf;
499 } else {
500 list_add(&req->list, &dev->rx_reqs);
501 continue;
502 }
503 }
504
505 /* Don't leave irqs off while doing memory copies */
506 spin_unlock_irqrestore(&dev->lock, flags);
507
508 if (len > current_rx_bytes)
509 size = current_rx_bytes;
510 else
511 size = len;
512
513 size -= copy_to_user(buf, current_rx_buf, size);
514 bytes_copied += size;
515 len -= size;
516 buf += size;
517
518 spin_lock_irqsave(&dev->lock, flags);
519
520 /* We've disconnected or reset so return. */
521 if (dev->reset_printer) {
522 list_add(¤t_rx_req->list, &dev->rx_reqs);
523 spin_unlock_irqrestore(&dev->lock, flags);
524 mutex_unlock(&dev->lock_printer_io);
525 return -EAGAIN;
526 }
527
528 /* If we not returning all the data left in this RX request
529 * buffer then adjust the amount of data left in the buffer.
530 * Othewise if we are done with this RX request buffer then
531 * requeue it to get any incoming data from the USB host.
532 */
533 if (size < current_rx_bytes) {
534 current_rx_bytes -= size;
535 current_rx_buf += size;
536 } else {
537 list_add(¤t_rx_req->list, &dev->rx_reqs);
538 current_rx_bytes = 0;
539 current_rx_buf = NULL;
540 current_rx_req = NULL;
541 }
542 }
543
544 dev->current_rx_req = current_rx_req;
545 dev->current_rx_bytes = current_rx_bytes;
546 dev->current_rx_buf = current_rx_buf;
547
548 spin_unlock_irqrestore(&dev->lock, flags);
549 mutex_unlock(&dev->lock_printer_io);
550
551 DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
552
553 if (bytes_copied)
554 return bytes_copied;
555 else
556 return -EAGAIN;
557}
558
559static ssize_t
560printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
561{
562 struct printer_dev *dev = fd->private_data;
563 unsigned long flags;
564 size_t size; /* Amount of data in a TX request. */
565 size_t bytes_copied = 0;
566 struct usb_request *req;
567
568 DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
569
570 if (len == 0)
571 return -EINVAL;
572
573 mutex_lock(&dev->lock_printer_io);
574 spin_lock_irqsave(&dev->lock, flags);
575
576 /* Check if a printer reset happens while we have interrupts on */
577 dev->reset_printer = 0;
578
579 /* Check if there is any available write buffers */
580 if (likely(list_empty(&dev->tx_reqs))) {
581 /* Turn interrupts back on before sleeping. */
582 spin_unlock_irqrestore(&dev->lock, flags);
583
584 /*
585 * If write buffers are available check if this is
586 * a NON-Blocking call or not.
587 */
588 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
589 mutex_unlock(&dev->lock_printer_io);
590 return -EAGAIN;
591 }
592
593 /* Sleep until a write buffer is available */
594 wait_event_interruptible(dev->tx_wait,
595 (likely(!list_empty(&dev->tx_reqs))));
596 spin_lock_irqsave(&dev->lock, flags);
597 }
598
599 while (likely(!list_empty(&dev->tx_reqs)) && len) {
600
601 if (len > USB_BUFSIZE)
602 size = USB_BUFSIZE;
603 else
604 size = len;
605
606 req = container_of(dev->tx_reqs.next, struct usb_request,
607 list);
608 list_del_init(&req->list);
609
610 req->complete = tx_complete;
611 req->length = size;
612
613 /* Check if we need to send a zero length packet. */
614 if (len > size)
615 /* They will be more TX requests so no yet. */
616 req->zero = 0;
617 else
618 /* If the data amount is not a multiple of the
619 * maxpacket size then send a zero length packet.
620 */
621 req->zero = ((len % dev->in_ep->maxpacket) == 0);
622
623 /* Don't leave irqs off while doing memory copies */
624 spin_unlock_irqrestore(&dev->lock, flags);
625
626 if (copy_from_user(req->buf, buf, size)) {
627 list_add(&req->list, &dev->tx_reqs);
628 mutex_unlock(&dev->lock_printer_io);
629 return bytes_copied;
630 }
631
632 bytes_copied += size;
633 len -= size;
634 buf += size;
635
636 spin_lock_irqsave(&dev->lock, flags);
637
638 /* We've disconnected or reset so free the req and buffer */
639 if (dev->reset_printer) {
640 list_add(&req->list, &dev->tx_reqs);
641 spin_unlock_irqrestore(&dev->lock, flags);
642 mutex_unlock(&dev->lock_printer_io);
643 return -EAGAIN;
644 }
645
646 if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
647 list_add(&req->list, &dev->tx_reqs);
648 spin_unlock_irqrestore(&dev->lock, flags);
649 mutex_unlock(&dev->lock_printer_io);
650 return -EAGAIN;
651 }
652
653 list_add(&req->list, &dev->tx_reqs_active);
654
655 }
656
657 spin_unlock_irqrestore(&dev->lock, flags);
658 mutex_unlock(&dev->lock_printer_io);
659
660 DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
661
662 if (bytes_copied)
663 return bytes_copied;
664 else
665 return -EAGAIN;
666}
667
668static int
669printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync)
670{
671 struct printer_dev *dev = fd->private_data;
672 struct inode *inode = file_inode(fd);
673 unsigned long flags;
674 int tx_list_empty;
675
676 inode_lock(inode);
677 spin_lock_irqsave(&dev->lock, flags);
678 tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
679 spin_unlock_irqrestore(&dev->lock, flags);
680
681 if (!tx_list_empty) {
682 /* Sleep until all data has been sent */
683 wait_event_interruptible(dev->tx_flush_wait,
684 (likely(list_empty(&dev->tx_reqs_active))));
685 }
686 inode_unlock(inode);
687
688 return 0;
689}
690
691static unsigned int
692printer_poll(struct file *fd, poll_table *wait)
693{
694 struct printer_dev *dev = fd->private_data;
695 unsigned long flags;
696 int status = 0;
697
698 mutex_lock(&dev->lock_printer_io);
699 spin_lock_irqsave(&dev->lock, flags);
700 setup_rx_reqs(dev);
701 spin_unlock_irqrestore(&dev->lock, flags);
702 mutex_unlock(&dev->lock_printer_io);
703
704 poll_wait(fd, &dev->rx_wait, wait);
705 poll_wait(fd, &dev->tx_wait, wait);
706
707 spin_lock_irqsave(&dev->lock, flags);
708 if (likely(!list_empty(&dev->tx_reqs)))
709 status |= POLLOUT | POLLWRNORM;
710
711 if (likely(dev->current_rx_bytes) ||
712 likely(!list_empty(&dev->rx_buffers)))
713 status |= POLLIN | POLLRDNORM;
714
715 spin_unlock_irqrestore(&dev->lock, flags);
716
717 return status;
718}
719
720static long
721printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
722{
723 struct printer_dev *dev = fd->private_data;
724 unsigned long flags;
725 int status = 0;
726
727 DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
728
729 /* handle ioctls */
730
731 spin_lock_irqsave(&dev->lock, flags);
732
733 switch (code) {
734 case GADGET_GET_PRINTER_STATUS:
735 status = (int)dev->printer_status;
736 break;
737 case GADGET_SET_PRINTER_STATUS:
738 dev->printer_status = (u8)arg;
739 break;
740 default:
741 /* could not handle ioctl */
742 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
743 code);
744 status = -ENOTTY;
745 }
746
747 spin_unlock_irqrestore(&dev->lock, flags);
748
749 return status;
750}
751
752/* used after endpoint configuration */
753static const struct file_operations printer_io_operations = {
754 .owner = THIS_MODULE,
755 .open = printer_open,
756 .read = printer_read,
757 .write = printer_write,
758 .fsync = printer_fsync,
759 .poll = printer_poll,
760 .unlocked_ioctl = printer_ioctl,
761 .release = printer_close,
762 .llseek = noop_llseek,
763};
764
765/*-------------------------------------------------------------------------*/
766
767static int
768set_printer_interface(struct printer_dev *dev)
769{
770 int result = 0;
771
772 dev->in_ep->desc = ep_desc(dev->gadget, &fs_ep_in_desc, &hs_ep_in_desc,
773 &ss_ep_in_desc);
774 dev->in_ep->driver_data = dev;
775
776 dev->out_ep->desc = ep_desc(dev->gadget, &fs_ep_out_desc,
777 &hs_ep_out_desc, &ss_ep_out_desc);
778 dev->out_ep->driver_data = dev;
779
780 result = usb_ep_enable(dev->in_ep);
781 if (result != 0) {
782 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
783 goto done;
784 }
785
786 result = usb_ep_enable(dev->out_ep);
787 if (result != 0) {
788 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
789 goto done;
790 }
791
792done:
793 /* on error, disable any endpoints */
794 if (result != 0) {
795 (void) usb_ep_disable(dev->in_ep);
796 (void) usb_ep_disable(dev->out_ep);
797 dev->in_ep->desc = NULL;
798 dev->out_ep->desc = NULL;
799 }
800
801 /* caller is responsible for cleanup on error */
802 return result;
803}
804
805static void printer_reset_interface(struct printer_dev *dev)
806{
807 unsigned long flags;
808
809 if (dev->interface < 0)
810 return;
811
812 DBG(dev, "%s\n", __func__);
813
814 if (dev->in_ep->desc)
815 usb_ep_disable(dev->in_ep);
816
817 if (dev->out_ep->desc)
818 usb_ep_disable(dev->out_ep);
819
820 spin_lock_irqsave(&dev->lock, flags);
821 dev->in_ep->desc = NULL;
822 dev->out_ep->desc = NULL;
823 dev->interface = -1;
824 spin_unlock_irqrestore(&dev->lock, flags);
825}
826
827/* Change our operational Interface. */
828static int set_interface(struct printer_dev *dev, unsigned number)
829{
830 int result = 0;
831
832 /* Free the current interface */
833 printer_reset_interface(dev);
834
835 result = set_printer_interface(dev);
836 if (result)
837 printer_reset_interface(dev);
838 else
839 dev->interface = number;
840
841 if (!result)
842 INFO(dev, "Using interface %x\n", number);
843
844 return result;
845}
846
847static void printer_soft_reset(struct printer_dev *dev)
848{
849 struct usb_request *req;
850
851 INFO(dev, "Received Printer Reset Request\n");
852
853 if (usb_ep_disable(dev->in_ep))
854 DBG(dev, "Failed to disable USB in_ep\n");
855 if (usb_ep_disable(dev->out_ep))
856 DBG(dev, "Failed to disable USB out_ep\n");
857
858 if (dev->current_rx_req != NULL) {
859 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
860 dev->current_rx_req = NULL;
861 }
862 dev->current_rx_bytes = 0;
863 dev->current_rx_buf = NULL;
864 dev->reset_printer = 1;
865
866 while (likely(!(list_empty(&dev->rx_buffers)))) {
867 req = container_of(dev->rx_buffers.next, struct usb_request,
868 list);
869 list_del_init(&req->list);
870 list_add(&req->list, &dev->rx_reqs);
871 }
872
873 while (likely(!(list_empty(&dev->rx_reqs_active)))) {
874 req = container_of(dev->rx_buffers.next, struct usb_request,
875 list);
876 list_del_init(&req->list);
877 list_add(&req->list, &dev->rx_reqs);
878 }
879
880 while (likely(!(list_empty(&dev->tx_reqs_active)))) {
881 req = container_of(dev->tx_reqs_active.next,
882 struct usb_request, list);
883 list_del_init(&req->list);
884 list_add(&req->list, &dev->tx_reqs);
885 }
886
887 if (usb_ep_enable(dev->in_ep))
888 DBG(dev, "Failed to enable USB in_ep\n");
889 if (usb_ep_enable(dev->out_ep))
890 DBG(dev, "Failed to enable USB out_ep\n");
891
892 wake_up_interruptible(&dev->rx_wait);
893 wake_up_interruptible(&dev->tx_wait);
894 wake_up_interruptible(&dev->tx_flush_wait);
895}
896
897/*-------------------------------------------------------------------------*/
898
899static bool gprinter_req_match(struct usb_function *f,
900 const struct usb_ctrlrequest *ctrl)
901{
902 struct printer_dev *dev = func_to_printer(f);
903 u16 w_index = le16_to_cpu(ctrl->wIndex);
904 u16 w_value = le16_to_cpu(ctrl->wValue);
905 u16 w_length = le16_to_cpu(ctrl->wLength);
906
907 if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE ||
908 (ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
909 return false;
910
911 switch (ctrl->bRequest) {
912 case GET_DEVICE_ID:
913 w_index >>= 8;
914 if (w_length <= PNP_STRING_LEN &&
915 (USB_DIR_IN & ctrl->bRequestType))
916 break;
917 return false;
918 case GET_PORT_STATUS:
919 if (!w_value && w_length == 1 &&
920 (USB_DIR_IN & ctrl->bRequestType))
921 break;
922 return false;
923 case SOFT_RESET:
924 if (!w_value && !w_length &&
925 !(USB_DIR_IN & ctrl->bRequestType))
926 break;
927 /* fall through */
928 default:
929 return false;
930 }
931 return w_index == dev->interface;
932}
933
934/*
935 * The setup() callback implements all the ep0 functionality that's not
936 * handled lower down.
937 */
938static int printer_func_setup(struct usb_function *f,
939 const struct usb_ctrlrequest *ctrl)
940{
941 struct printer_dev *dev = func_to_printer(f);
942 struct usb_composite_dev *cdev = f->config->cdev;
943 struct usb_request *req = cdev->req;
944 int value = -EOPNOTSUPP;
945 u16 wIndex = le16_to_cpu(ctrl->wIndex);
946 u16 wValue = le16_to_cpu(ctrl->wValue);
947 u16 wLength = le16_to_cpu(ctrl->wLength);
948
949 DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
950 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
951
952 switch (ctrl->bRequestType&USB_TYPE_MASK) {
953 case USB_TYPE_CLASS:
954 switch (ctrl->bRequest) {
955 case GET_DEVICE_ID: /* Get the IEEE-1284 PNP String */
956 /* Only one printer interface is supported. */
957 if ((wIndex>>8) != dev->interface)
958 break;
959
960 value = (dev->pnp_string[0] << 8) | dev->pnp_string[1];
961 memcpy(req->buf, dev->pnp_string, value);
962 DBG(dev, "1284 PNP String: %x %s\n", value,
963 &dev->pnp_string[2]);
964 break;
965
966 case GET_PORT_STATUS: /* Get Port Status */
967 /* Only one printer interface is supported. */
968 if (wIndex != dev->interface)
969 break;
970
971 *(u8 *)req->buf = dev->printer_status;
972 value = min_t(u16, wLength, 1);
973 break;
974
975 case SOFT_RESET: /* Soft Reset */
976 /* Only one printer interface is supported. */
977 if (wIndex != dev->interface)
978 break;
979
980 printer_soft_reset(dev);
981
982 value = 0;
983 break;
984
985 default:
986 goto unknown;
987 }
988 break;
989
990 default:
991unknown:
992 VDBG(dev,
993 "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
994 ctrl->bRequestType, ctrl->bRequest,
995 wValue, wIndex, wLength);
996 break;
997 }
998 /* host either stalls (value < 0) or reports success */
999 if (value >= 0) {
1000 req->length = value;
1001 req->zero = value < wLength;
1002 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1003 if (value < 0) {
1004 ERROR(dev, "%s:%d Error!\n", __func__, __LINE__);
1005 req->status = 0;
1006 }
1007 }
1008 return value;
1009}
1010
1011static int printer_func_bind(struct usb_configuration *c,
1012 struct usb_function *f)
1013{
1014 struct usb_gadget *gadget = c->cdev->gadget;
1015 struct printer_dev *dev = func_to_printer(f);
1016 struct device *pdev;
1017 struct usb_composite_dev *cdev = c->cdev;
1018 struct usb_ep *in_ep;
1019 struct usb_ep *out_ep = NULL;
1020 struct usb_request *req;
1021 dev_t devt;
1022 int id;
1023 int ret;
1024 u32 i;
1025
1026 id = usb_interface_id(c, f);
1027 if (id < 0)
1028 return id;
1029 intf_desc.bInterfaceNumber = id;
1030
1031 /* finish hookup to lower layer ... */
1032 dev->gadget = gadget;
1033
1034 /* all we really need is bulk IN/OUT */
1035 in_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_in_desc);
1036 if (!in_ep) {
1037autoconf_fail:
1038 dev_err(&cdev->gadget->dev, "can't autoconfigure on %s\n",
1039 cdev->gadget->name);
1040 return -ENODEV;
1041 }
1042
1043 out_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_out_desc);
1044 if (!out_ep)
1045 goto autoconf_fail;
1046
1047 /* assumes that all endpoints are dual-speed */
1048 hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1049 hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1050 ss_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1051 ss_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1052
1053 ret = usb_assign_descriptors(f, fs_printer_function,
1054 hs_printer_function, ss_printer_function, NULL);
1055 if (ret)
1056 return ret;
1057
1058 dev->in_ep = in_ep;
1059 dev->out_ep = out_ep;
1060
1061 ret = -ENOMEM;
1062 for (i = 0; i < dev->q_len; i++) {
1063 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1064 if (!req)
1065 goto fail_tx_reqs;
1066 list_add(&req->list, &dev->tx_reqs);
1067 }
1068
1069 for (i = 0; i < dev->q_len; i++) {
1070 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1071 if (!req)
1072 goto fail_rx_reqs;
1073 list_add(&req->list, &dev->rx_reqs);
1074 }
1075
1076 /* Setup the sysfs files for the printer gadget. */
1077 devt = MKDEV(major, dev->minor);
1078 pdev = device_create(usb_gadget_class, NULL, devt,
1079 NULL, "g_printer%d", dev->minor);
1080 if (IS_ERR(pdev)) {
1081 ERROR(dev, "Failed to create device: g_printer\n");
1082 ret = PTR_ERR(pdev);
1083 goto fail_rx_reqs;
1084 }
1085
1086 /*
1087 * Register a character device as an interface to a user mode
1088 * program that handles the printer specific functionality.
1089 */
1090 cdev_init(&dev->printer_cdev, &printer_io_operations);
1091 dev->printer_cdev.owner = THIS_MODULE;
1092 ret = cdev_add(&dev->printer_cdev, devt, 1);
1093 if (ret) {
1094 ERROR(dev, "Failed to open char device\n");
1095 goto fail_cdev_add;
1096 }
1097
1098 return 0;
1099
1100fail_cdev_add:
1101 device_destroy(usb_gadget_class, devt);
1102
1103fail_rx_reqs:
1104 while (!list_empty(&dev->rx_reqs)) {
1105 req = container_of(dev->rx_reqs.next, struct usb_request, list);
1106 list_del(&req->list);
1107 printer_req_free(dev->out_ep, req);
1108 }
1109
1110fail_tx_reqs:
1111 while (!list_empty(&dev->tx_reqs)) {
1112 req = container_of(dev->tx_reqs.next, struct usb_request, list);
1113 list_del(&req->list);
1114 printer_req_free(dev->in_ep, req);
1115 }
1116
1117 return ret;
1118
1119}
1120
1121static int printer_func_set_alt(struct usb_function *f,
1122 unsigned intf, unsigned alt)
1123{
1124 struct printer_dev *dev = func_to_printer(f);
1125 int ret = -ENOTSUPP;
1126
1127 if (!alt)
1128 ret = set_interface(dev, intf);
1129
1130 return ret;
1131}
1132
1133static void printer_func_disable(struct usb_function *f)
1134{
1135 struct printer_dev *dev = func_to_printer(f);
1136
1137 DBG(dev, "%s\n", __func__);
1138
1139 printer_reset_interface(dev);
1140}
1141
1142static inline struct f_printer_opts
1143*to_f_printer_opts(struct config_item *item)
1144{
1145 return container_of(to_config_group(item), struct f_printer_opts,
1146 func_inst.group);
1147}
1148
1149static void printer_attr_release(struct config_item *item)
1150{
1151 struct f_printer_opts *opts = to_f_printer_opts(item);
1152
1153 usb_put_function_instance(&opts->func_inst);
1154}
1155
1156static struct configfs_item_operations printer_item_ops = {
1157 .release = printer_attr_release,
1158};
1159
1160static ssize_t f_printer_opts_pnp_string_show(struct config_item *item,
1161 char *page)
1162{
1163 struct f_printer_opts *opts = to_f_printer_opts(item);
1164 int result;
1165
1166 mutex_lock(&opts->lock);
1167 result = strlcpy(page, opts->pnp_string + 2, PNP_STRING_LEN - 2);
1168 mutex_unlock(&opts->lock);
1169
1170 return result;
1171}
1172
1173static ssize_t f_printer_opts_pnp_string_store(struct config_item *item,
1174 const char *page, size_t len)
1175{
1176 struct f_printer_opts *opts = to_f_printer_opts(item);
1177 int result, l;
1178
1179 mutex_lock(&opts->lock);
1180 result = strlcpy(opts->pnp_string + 2, page, PNP_STRING_LEN - 2);
1181 l = strlen(opts->pnp_string + 2) + 2;
1182 opts->pnp_string[0] = (l >> 8) & 0xFF;
1183 opts->pnp_string[1] = l & 0xFF;
1184 mutex_unlock(&opts->lock);
1185
1186 return result;
1187}
1188
1189CONFIGFS_ATTR(f_printer_opts_, pnp_string);
1190
1191static ssize_t f_printer_opts_q_len_show(struct config_item *item,
1192 char *page)
1193{
1194 struct f_printer_opts *opts = to_f_printer_opts(item);
1195 int result;
1196
1197 mutex_lock(&opts->lock);
1198 result = sprintf(page, "%d\n", opts->q_len);
1199 mutex_unlock(&opts->lock);
1200
1201 return result;
1202}
1203
1204static ssize_t f_printer_opts_q_len_store(struct config_item *item,
1205 const char *page, size_t len)
1206{
1207 struct f_printer_opts *opts = to_f_printer_opts(item);
1208 int ret;
1209 u16 num;
1210
1211 mutex_lock(&opts->lock);
1212 if (opts->refcnt) {
1213 ret = -EBUSY;
1214 goto end;
1215 }
1216
1217 ret = kstrtou16(page, 0, &num);
1218 if (ret)
1219 goto end;
1220
1221 opts->q_len = (unsigned)num;
1222 ret = len;
1223end:
1224 mutex_unlock(&opts->lock);
1225 return ret;
1226}
1227
1228CONFIGFS_ATTR(f_printer_opts_, q_len);
1229
1230static struct configfs_attribute *printer_attrs[] = {
1231 &f_printer_opts_attr_pnp_string,
1232 &f_printer_opts_attr_q_len,
1233 NULL,
1234};
1235
1236static struct config_item_type printer_func_type = {
1237 .ct_item_ops = &printer_item_ops,
1238 .ct_attrs = printer_attrs,
1239 .ct_owner = THIS_MODULE,
1240};
1241
1242static inline int gprinter_get_minor(void)
1243{
1244 int ret;
1245
1246 ret = ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL);
1247 if (ret >= PRINTER_MINORS) {
1248 ida_simple_remove(&printer_ida, ret);
1249 ret = -ENODEV;
1250 }
1251
1252 return ret;
1253}
1254
1255static inline void gprinter_put_minor(int minor)
1256{
1257 ida_simple_remove(&printer_ida, minor);
1258}
1259
1260static int gprinter_setup(int);
1261static void gprinter_cleanup(void);
1262
1263static void gprinter_free_inst(struct usb_function_instance *f)
1264{
1265 struct f_printer_opts *opts;
1266
1267 opts = container_of(f, struct f_printer_opts, func_inst);
1268
1269 mutex_lock(&printer_ida_lock);
1270
1271 gprinter_put_minor(opts->minor);
1272 if (idr_is_empty(&printer_ida.idr))
1273 gprinter_cleanup();
1274
1275 mutex_unlock(&printer_ida_lock);
1276
1277 kfree(opts);
1278}
1279
1280static struct usb_function_instance *gprinter_alloc_inst(void)
1281{
1282 struct f_printer_opts *opts;
1283 struct usb_function_instance *ret;
1284 int status = 0;
1285
1286 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1287 if (!opts)
1288 return ERR_PTR(-ENOMEM);
1289
1290 mutex_init(&opts->lock);
1291 opts->func_inst.free_func_inst = gprinter_free_inst;
1292 ret = &opts->func_inst;
1293
1294 mutex_lock(&printer_ida_lock);
1295
1296 if (idr_is_empty(&printer_ida.idr)) {
1297 status = gprinter_setup(PRINTER_MINORS);
1298 if (status) {
1299 ret = ERR_PTR(status);
1300 kfree(opts);
1301 goto unlock;
1302 }
1303 }
1304
1305 opts->minor = gprinter_get_minor();
1306 if (opts->minor < 0) {
1307 ret = ERR_PTR(opts->minor);
1308 kfree(opts);
1309 if (idr_is_empty(&printer_ida.idr))
1310 gprinter_cleanup();
1311 goto unlock;
1312 }
1313 config_group_init_type_name(&opts->func_inst.group, "",
1314 &printer_func_type);
1315
1316unlock:
1317 mutex_unlock(&printer_ida_lock);
1318 return ret;
1319}
1320
1321static void gprinter_free(struct usb_function *f)
1322{
1323 struct printer_dev *dev = func_to_printer(f);
1324 struct f_printer_opts *opts;
1325
1326 opts = container_of(f->fi, struct f_printer_opts, func_inst);
1327 kfree(dev);
1328 mutex_lock(&opts->lock);
1329 --opts->refcnt;
1330 mutex_unlock(&opts->lock);
1331}
1332
1333static void printer_func_unbind(struct usb_configuration *c,
1334 struct usb_function *f)
1335{
1336 struct printer_dev *dev;
1337 struct usb_request *req;
1338
1339 dev = func_to_printer(f);
1340
1341 device_destroy(usb_gadget_class, MKDEV(major, dev->minor));
1342
1343 /* Remove Character Device */
1344 cdev_del(&dev->printer_cdev);
1345
1346 /* we must already have been disconnected ... no i/o may be active */
1347 WARN_ON(!list_empty(&dev->tx_reqs_active));
1348 WARN_ON(!list_empty(&dev->rx_reqs_active));
1349
1350 /* Free all memory for this driver. */
1351 while (!list_empty(&dev->tx_reqs)) {
1352 req = container_of(dev->tx_reqs.next, struct usb_request,
1353 list);
1354 list_del(&req->list);
1355 printer_req_free(dev->in_ep, req);
1356 }
1357
1358 if (dev->current_rx_req != NULL)
1359 printer_req_free(dev->out_ep, dev->current_rx_req);
1360
1361 while (!list_empty(&dev->rx_reqs)) {
1362 req = container_of(dev->rx_reqs.next,
1363 struct usb_request, list);
1364 list_del(&req->list);
1365 printer_req_free(dev->out_ep, req);
1366 }
1367
1368 while (!list_empty(&dev->rx_buffers)) {
1369 req = container_of(dev->rx_buffers.next,
1370 struct usb_request, list);
1371 list_del(&req->list);
1372 printer_req_free(dev->out_ep, req);
1373 }
1374 usb_free_all_descriptors(f);
1375}
1376
1377static struct usb_function *gprinter_alloc(struct usb_function_instance *fi)
1378{
1379 struct printer_dev *dev;
1380 struct f_printer_opts *opts;
1381
1382 opts = container_of(fi, struct f_printer_opts, func_inst);
1383
1384 mutex_lock(&opts->lock);
1385 if (opts->minor >= minors) {
1386 mutex_unlock(&opts->lock);
1387 return ERR_PTR(-ENOENT);
1388 }
1389
1390 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1391 if (!dev) {
1392 mutex_unlock(&opts->lock);
1393 return ERR_PTR(-ENOMEM);
1394 }
1395
1396 ++opts->refcnt;
1397 dev->minor = opts->minor;
1398 dev->pnp_string = opts->pnp_string;
1399 dev->q_len = opts->q_len;
1400 mutex_unlock(&opts->lock);
1401
1402 dev->function.name = "printer";
1403 dev->function.bind = printer_func_bind;
1404 dev->function.setup = printer_func_setup;
1405 dev->function.unbind = printer_func_unbind;
1406 dev->function.set_alt = printer_func_set_alt;
1407 dev->function.disable = printer_func_disable;
1408 dev->function.req_match = gprinter_req_match;
1409 dev->function.free_func = gprinter_free;
1410
1411 INIT_LIST_HEAD(&dev->tx_reqs);
1412 INIT_LIST_HEAD(&dev->rx_reqs);
1413 INIT_LIST_HEAD(&dev->rx_buffers);
1414 INIT_LIST_HEAD(&dev->tx_reqs_active);
1415 INIT_LIST_HEAD(&dev->rx_reqs_active);
1416
1417 spin_lock_init(&dev->lock);
1418 mutex_init(&dev->lock_printer_io);
1419 init_waitqueue_head(&dev->rx_wait);
1420 init_waitqueue_head(&dev->tx_wait);
1421 init_waitqueue_head(&dev->tx_flush_wait);
1422
1423 dev->interface = -1;
1424 dev->printer_cdev_open = 0;
1425 dev->printer_status = PRINTER_NOT_ERROR;
1426 dev->current_rx_req = NULL;
1427 dev->current_rx_bytes = 0;
1428 dev->current_rx_buf = NULL;
1429
1430 return &dev->function;
1431}
1432
1433DECLARE_USB_FUNCTION_INIT(printer, gprinter_alloc_inst, gprinter_alloc);
1434MODULE_LICENSE("GPL");
1435MODULE_AUTHOR("Craig Nadler");
1436
1437static int gprinter_setup(int count)
1438{
1439 int status;
1440 dev_t devt;
1441
1442 usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1443 if (IS_ERR(usb_gadget_class)) {
1444 status = PTR_ERR(usb_gadget_class);
1445 usb_gadget_class = NULL;
1446 pr_err("unable to create usb_gadget class %d\n", status);
1447 return status;
1448 }
1449
1450 status = alloc_chrdev_region(&devt, 0, count, "USB printer gadget");
1451 if (status) {
1452 pr_err("alloc_chrdev_region %d\n", status);
1453 class_destroy(usb_gadget_class);
1454 usb_gadget_class = NULL;
1455 return status;
1456 }
1457
1458 major = MAJOR(devt);
1459 minors = count;
1460
1461 return status;
1462}
1463
1464static void gprinter_cleanup(void)
1465{
1466 if (major) {
1467 unregister_chrdev_region(MKDEV(major, 0), minors);
1468 major = minors = 0;
1469 }
1470 class_destroy(usb_gadget_class);
1471 usb_gadget_class = NULL;
1472}