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WIP FPC-III support
[linux/fpc-iii.git] / drivers / usb / gadget / function / f_printer.c
blob2f1eb2e81d306bdf34bf0cc0c78fad477738c6e7
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 static int major, minors;
55 static struct class *usb_gadget_class;
56 static DEFINE_IDA(printer_ida);
57 static DEFINE_MUTEX(printer_ida_lock); /* protects access do printer_ida */
58
59 /*-------------------------------------------------------------------------*/
60
61 struct printer_dev {
62 spinlock_t lock; /* lock this structure */
63 /* lock buffer lists during read/write calls */
64 struct mutex lock_printer_io;
65 struct usb_gadget *gadget;
66 s8 interface;
67 struct usb_ep *in_ep, *out_ep;
68 struct kref kref;
69 struct list_head rx_reqs; /* List of free RX structs */
70 struct list_head rx_reqs_active; /* List of Active RX xfers */
71 struct list_head rx_buffers; /* List of completed xfers */
72 /* wait until there is data to be read. */
73 wait_queue_head_t rx_wait;
74 struct list_head tx_reqs; /* List of free TX structs */
75 struct list_head tx_reqs_active; /* List of Active TX xfers */
76 /* Wait until there are write buffers available to use. */
77 wait_queue_head_t tx_wait;
78 /* Wait until all write buffers have been sent. */
79 wait_queue_head_t tx_flush_wait;
80 struct usb_request *current_rx_req;
81 size_t current_rx_bytes;
82 u8 *current_rx_buf;
83 u8 printer_status;
84 u8 reset_printer;
85 int minor;
86 struct cdev printer_cdev;
87 u8 printer_cdev_open;
88 wait_queue_head_t wait;
89 unsigned q_len;
90 char *pnp_string; /* We don't own memory! */
91 struct usb_function function;
92 };
93
94 static inline struct printer_dev *func_to_printer(struct usb_function *f)
95 {
96 return container_of(f, struct printer_dev, function);
97 }
98
99 /*-------------------------------------------------------------------------*/
100
101 /*
102 * DESCRIPTORS ... most are static, but strings and (full) configuration
103 * descriptors are built on demand.
104 */
105
106 /* holds our biggest descriptor */
107 #define USB_DESC_BUFSIZE 256
108 #define USB_BUFSIZE 8192
109
110 static struct usb_interface_descriptor intf_desc = {
111 .bLength = sizeof(intf_desc),
112 .bDescriptorType = USB_DT_INTERFACE,
113 .bNumEndpoints = 2,
114 .bInterfaceClass = USB_CLASS_PRINTER,
115 .bInterfaceSubClass = 1, /* Printer Sub-Class */
116 .bInterfaceProtocol = 2, /* Bi-Directional */
117 .iInterface = 0
118 };
119
120 static struct usb_endpoint_descriptor fs_ep_in_desc = {
121 .bLength = USB_DT_ENDPOINT_SIZE,
122 .bDescriptorType = USB_DT_ENDPOINT,
123 .bEndpointAddress = USB_DIR_IN,
124 .bmAttributes = USB_ENDPOINT_XFER_BULK
125 };
126
127 static struct usb_endpoint_descriptor fs_ep_out_desc = {
128 .bLength = USB_DT_ENDPOINT_SIZE,
129 .bDescriptorType = USB_DT_ENDPOINT,
130 .bEndpointAddress = USB_DIR_OUT,
131 .bmAttributes = USB_ENDPOINT_XFER_BULK
132 };
133
134 static struct usb_descriptor_header *fs_printer_function[] = {
135 (struct usb_descriptor_header *) &intf_desc,
136 (struct usb_descriptor_header *) &fs_ep_in_desc,
137 (struct usb_descriptor_header *) &fs_ep_out_desc,
138 NULL
139 };
140
141 /*
142 * usb 2.0 devices need to expose both high speed and full speed
143 * descriptors, unless they only run at full speed.
144 */
145
146 static struct usb_endpoint_descriptor hs_ep_in_desc = {
147 .bLength = USB_DT_ENDPOINT_SIZE,
148 .bDescriptorType = USB_DT_ENDPOINT,
149 .bmAttributes = USB_ENDPOINT_XFER_BULK,
150 .wMaxPacketSize = cpu_to_le16(512)
151 };
152
153 static struct usb_endpoint_descriptor hs_ep_out_desc = {
154 .bLength = USB_DT_ENDPOINT_SIZE,
155 .bDescriptorType = USB_DT_ENDPOINT,
156 .bmAttributes = USB_ENDPOINT_XFER_BULK,
157 .wMaxPacketSize = cpu_to_le16(512)
158 };
159
160 static struct usb_descriptor_header *hs_printer_function[] = {
161 (struct usb_descriptor_header *) &intf_desc,
162 (struct usb_descriptor_header *) &hs_ep_in_desc,
163 (struct usb_descriptor_header *) &hs_ep_out_desc,
164 NULL
165 };
166
167 /*
168 * Added endpoint descriptors for 3.0 devices
169 */
170
171 static struct usb_endpoint_descriptor ss_ep_in_desc = {
172 .bLength = USB_DT_ENDPOINT_SIZE,
173 .bDescriptorType = USB_DT_ENDPOINT,
174 .bmAttributes = USB_ENDPOINT_XFER_BULK,
175 .wMaxPacketSize = cpu_to_le16(1024),
176 };
177
178 static struct usb_ss_ep_comp_descriptor ss_ep_in_comp_desc = {
179 .bLength = sizeof(ss_ep_in_comp_desc),
180 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
181 };
182
183 static struct usb_endpoint_descriptor ss_ep_out_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
190 static struct usb_ss_ep_comp_descriptor ss_ep_out_comp_desc = {
191 .bLength = sizeof(ss_ep_out_comp_desc),
192 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
193 };
194
195 static struct usb_descriptor_header *ss_printer_function[] = {
196 (struct usb_descriptor_header *) &intf_desc,
197 (struct usb_descriptor_header *) &ss_ep_in_desc,
198 (struct usb_descriptor_header *) &ss_ep_in_comp_desc,
199 (struct usb_descriptor_header *) &ss_ep_out_desc,
200 (struct usb_descriptor_header *) &ss_ep_out_comp_desc,
201 NULL
202 };
203
204 /* maxpacket and other transfer characteristics vary by speed. */
205 static inline struct usb_endpoint_descriptor *ep_desc(struct usb_gadget *gadget,
206 struct usb_endpoint_descriptor *fs,
207 struct usb_endpoint_descriptor *hs,
208 struct usb_endpoint_descriptor *ss)
209 {
210 switch (gadget->speed) {
211 case USB_SPEED_SUPER:
212 return ss;
213 case USB_SPEED_HIGH:
214 return hs;
215 default:
216 return fs;
217 }
218 }
219
220 /*-------------------------------------------------------------------------*/
221
222 static void printer_dev_free(struct kref *kref)
223 {
224 struct printer_dev *dev = container_of(kref, struct printer_dev, kref);
225
226 kfree(dev);
227 }
228
229 static struct usb_request *
230 printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
231 {
232 struct usb_request *req;
233
234 req = usb_ep_alloc_request(ep, gfp_flags);
235
236 if (req != NULL) {
237 req->length = len;
238 req->buf = kmalloc(len, gfp_flags);
239 if (req->buf == NULL) {
240 usb_ep_free_request(ep, req);
241 return NULL;
242 }
243 }
244
245 return req;
246 }
247
248 static void
249 printer_req_free(struct usb_ep *ep, struct usb_request *req)
250 {
251 if (ep != NULL && req != NULL) {
252 kfree(req->buf);
253 usb_ep_free_request(ep, req);
254 }
255 }
256
257 /*-------------------------------------------------------------------------*/
258
259 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
260 {
261 struct printer_dev *dev = ep->driver_data;
262 int status = req->status;
263 unsigned long flags;
264
265 spin_lock_irqsave(&dev->lock, flags);
266
267 list_del_init(&req->list); /* Remode from Active List */
268
269 switch (status) {
270
271 /* normal completion */
272 case 0:
273 if (req->actual > 0) {
274 list_add_tail(&req->list, &dev->rx_buffers);
275 DBG(dev, "G_Printer : rx length %d\n", req->actual);
276 } else {
277 list_add(&req->list, &dev->rx_reqs);
278 }
279 break;
280
281 /* software-driven interface shutdown */
282 case -ECONNRESET: /* unlink */
283 case -ESHUTDOWN: /* disconnect etc */
284 VDBG(dev, "rx shutdown, code %d\n", status);
285 list_add(&req->list, &dev->rx_reqs);
286 break;
287
288 /* for hardware automagic (such as pxa) */
289 case -ECONNABORTED: /* endpoint reset */
290 DBG(dev, "rx %s reset\n", ep->name);
291 list_add(&req->list, &dev->rx_reqs);
292 break;
293
294 /* data overrun */
295 case -EOVERFLOW:
296 fallthrough;
297
298 default:
299 DBG(dev, "rx status %d\n", status);
300 list_add(&req->list, &dev->rx_reqs);
301 break;
302 }
303
304 wake_up_interruptible(&dev->rx_wait);
305 spin_unlock_irqrestore(&dev->lock, flags);
306 }
307
308 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
309 {
310 struct printer_dev *dev = ep->driver_data;
311
312 switch (req->status) {
313 default:
314 VDBG(dev, "tx err %d\n", req->status);
315 fallthrough;
316 case -ECONNRESET: /* unlink */
317 case -ESHUTDOWN: /* disconnect etc */
318 break;
319 case 0:
320 break;
321 }
322
323 spin_lock(&dev->lock);
324 /* Take the request struct off the active list and put it on the
325 * free list.
326 */
327 list_del_init(&req->list);
328 list_add(&req->list, &dev->tx_reqs);
329 wake_up_interruptible(&dev->tx_wait);
330 if (likely(list_empty(&dev->tx_reqs_active)))
331 wake_up_interruptible(&dev->tx_flush_wait);
332
333 spin_unlock(&dev->lock);
334 }
335
336 /*-------------------------------------------------------------------------*/
337
338 static int
339 printer_open(struct inode *inode, struct file *fd)
340 {
341 struct printer_dev *dev;
342 unsigned long flags;
343 int ret = -EBUSY;
344
345 dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
346
347 spin_lock_irqsave(&dev->lock, flags);
348
349 if (dev->interface < 0) {
350 spin_unlock_irqrestore(&dev->lock, flags);
351 return -ENODEV;
352 }
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 kref_get(&dev->kref);
365 DBG(dev, "printer_open returned %x\n", ret);
366 return ret;
367 }
368
369 static int
370 printer_close(struct inode *inode, struct file *fd)
371 {
372 struct printer_dev *dev = fd->private_data;
373 unsigned long flags;
374
375 spin_lock_irqsave(&dev->lock, flags);
376 dev->printer_cdev_open = 0;
377 fd->private_data = NULL;
378 /* Change printer status to show that the printer is off-line. */
379 dev->printer_status &= ~PRINTER_SELECTED;
380 spin_unlock_irqrestore(&dev->lock, flags);
381
382 kref_put(&dev->kref, printer_dev_free);
383 DBG(dev, "printer_close\n");
384
385 return 0;
386 }
387
388 /* This function must be called with interrupts turned off. */
389 static void
390 setup_rx_reqs(struct printer_dev *dev)
391 {
392 struct usb_request *req;
393
394 while (likely(!list_empty(&dev->rx_reqs))) {
395 int error;
396
397 req = container_of(dev->rx_reqs.next,
398 struct usb_request, list);
399 list_del_init(&req->list);
400
401 /* The USB Host sends us whatever amount of data it wants to
402 * so we always set the length field to the full USB_BUFSIZE.
403 * If the amount of data is more than the read() caller asked
404 * for it will be stored in the request buffer until it is
405 * asked for by read().
406 */
407 req->length = USB_BUFSIZE;
408 req->complete = rx_complete;
409
410 /* here, we unlock, and only unlock, to avoid deadlock. */
411 spin_unlock(&dev->lock);
412 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
413 spin_lock(&dev->lock);
414 if (error) {
415 DBG(dev, "rx submit --> %d\n", error);
416 list_add(&req->list, &dev->rx_reqs);
417 break;
418 }
419 /* if the req is empty, then add it into dev->rx_reqs_active. */
420 else if (list_empty(&req->list))
421 list_add(&req->list, &dev->rx_reqs_active);
422 }
423 }
424
425 static ssize_t
426 printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
427 {
428 struct printer_dev *dev = fd->private_data;
429 unsigned long flags;
430 size_t size;
431 size_t bytes_copied;
432 struct usb_request *req;
433 /* This is a pointer to the current USB rx request. */
434 struct usb_request *current_rx_req;
435 /* This is the number of bytes in the current rx buffer. */
436 size_t current_rx_bytes;
437 /* This is a pointer to the current rx buffer. */
438 u8 *current_rx_buf;
439
440 if (len == 0)
441 return -EINVAL;
442
443 DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
444
445 mutex_lock(&dev->lock_printer_io);
446 spin_lock_irqsave(&dev->lock, flags);
447
448 if (dev->interface < 0) {
449 spin_unlock_irqrestore(&dev->lock, flags);
450 mutex_unlock(&dev->lock_printer_io);
451 return -ENODEV;
452 }
453
454 /* We will use this flag later to check if a printer reset happened
455 * after we turn interrupts back on.
456 */
457 dev->reset_printer = 0;
458
459 setup_rx_reqs(dev);
460
461 bytes_copied = 0;
462 current_rx_req = dev->current_rx_req;
463 current_rx_bytes = dev->current_rx_bytes;
464 current_rx_buf = dev->current_rx_buf;
465 dev->current_rx_req = NULL;
466 dev->current_rx_bytes = 0;
467 dev->current_rx_buf = NULL;
468
469 /* Check if there is any data in the read buffers. Please note that
470 * current_rx_bytes is the number of bytes in the current rx buffer.
471 * If it is zero then check if there are any other rx_buffers that
472 * are on the completed list. We are only out of data if all rx
473 * buffers are empty.
474 */
475 if ((current_rx_bytes == 0) &&
476 (likely(list_empty(&dev->rx_buffers)))) {
477 /* Turn interrupts back on before sleeping. */
478 spin_unlock_irqrestore(&dev->lock, flags);
479
480 /*
481 * If no data is available check if this is a NON-Blocking
482 * call or not.
483 */
484 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
485 mutex_unlock(&dev->lock_printer_io);
486 return -EAGAIN;
487 }
488
489 /* Sleep until data is available */
490 wait_event_interruptible(dev->rx_wait,
491 (likely(!list_empty(&dev->rx_buffers))));
492 spin_lock_irqsave(&dev->lock, flags);
493 }
494
495 /* We have data to return then copy it to the caller's buffer.*/
496 while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
497 && len) {
498 if (current_rx_bytes == 0) {
499 req = container_of(dev->rx_buffers.next,
500 struct usb_request, list);
501 list_del_init(&req->list);
502
503 if (req->actual && req->buf) {
504 current_rx_req = req;
505 current_rx_bytes = req->actual;
506 current_rx_buf = req->buf;
507 } else {
508 list_add(&req->list, &dev->rx_reqs);
509 continue;
510 }
511 }
512
513 /* Don't leave irqs off while doing memory copies */
514 spin_unlock_irqrestore(&dev->lock, flags);
515
516 if (len > current_rx_bytes)
517 size = current_rx_bytes;
518 else
519 size = len;
520
521 size -= copy_to_user(buf, current_rx_buf, size);
522 bytes_copied += size;
523 len -= size;
524 buf += size;
525
526 spin_lock_irqsave(&dev->lock, flags);
527
528 /* We've disconnected or reset so return. */
529 if (dev->reset_printer) {
530 list_add(&current_rx_req->list, &dev->rx_reqs);
531 spin_unlock_irqrestore(&dev->lock, flags);
532 mutex_unlock(&dev->lock_printer_io);
533 return -EAGAIN;
534 }
535
536 /* If we not returning all the data left in this RX request
537 * buffer then adjust the amount of data left in the buffer.
538 * Othewise if we are done with this RX request buffer then
539 * requeue it to get any incoming data from the USB host.
540 */
541 if (size < current_rx_bytes) {
542 current_rx_bytes -= size;
543 current_rx_buf += size;
544 } else {
545 list_add(&current_rx_req->list, &dev->rx_reqs);
546 current_rx_bytes = 0;
547 current_rx_buf = NULL;
548 current_rx_req = NULL;
549 }
550 }
551
552 dev->current_rx_req = current_rx_req;
553 dev->current_rx_bytes = current_rx_bytes;
554 dev->current_rx_buf = current_rx_buf;
555
556 spin_unlock_irqrestore(&dev->lock, flags);
557 mutex_unlock(&dev->lock_printer_io);
558
559 DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
560
561 if (bytes_copied)
562 return bytes_copied;
563 else
564 return -EAGAIN;
565 }
566
567 static ssize_t
568 printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
569 {
570 struct printer_dev *dev = fd->private_data;
571 unsigned long flags;
572 size_t size; /* Amount of data in a TX request. */
573 size_t bytes_copied = 0;
574 struct usb_request *req;
575 int value;
576
577 DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
578
579 if (len == 0)
580 return -EINVAL;
581
582 mutex_lock(&dev->lock_printer_io);
583 spin_lock_irqsave(&dev->lock, flags);
584
585 if (dev->interface < 0) {
586 spin_unlock_irqrestore(&dev->lock, flags);
587 mutex_unlock(&dev->lock_printer_io);
588 return -ENODEV;
589 }
590
591 /* Check if a printer reset happens while we have interrupts on */
592 dev->reset_printer = 0;
593
594 /* Check if there is any available write buffers */
595 if (likely(list_empty(&dev->tx_reqs))) {
596 /* Turn interrupts back on before sleeping. */
597 spin_unlock_irqrestore(&dev->lock, flags);
598
599 /*
600 * If write buffers are available check if this is
601 * a NON-Blocking call or not.
602 */
603 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
604 mutex_unlock(&dev->lock_printer_io);
605 return -EAGAIN;
606 }
607
608 /* Sleep until a write buffer is available */
609 wait_event_interruptible(dev->tx_wait,
610 (likely(!list_empty(&dev->tx_reqs))));
611 spin_lock_irqsave(&dev->lock, flags);
612 }
613
614 while (likely(!list_empty(&dev->tx_reqs)) && len) {
615
616 if (len > USB_BUFSIZE)
617 size = USB_BUFSIZE;
618 else
619 size = len;
620
621 req = container_of(dev->tx_reqs.next, struct usb_request,
622 list);
623 list_del_init(&req->list);
624
625 req->complete = tx_complete;
626 req->length = size;
627
628 /* Check if we need to send a zero length packet. */
629 if (len > size)
630 /* They will be more TX requests so no yet. */
631 req->zero = 0;
632 else
633 /* If the data amount is not a multiple of the
634 * maxpacket size then send a zero length packet.
635 */
636 req->zero = ((len % dev->in_ep->maxpacket) == 0);
637
638 /* Don't leave irqs off while doing memory copies */
639 spin_unlock_irqrestore(&dev->lock, flags);
640
641 if (copy_from_user(req->buf, buf, size)) {
642 list_add(&req->list, &dev->tx_reqs);
643 mutex_unlock(&dev->lock_printer_io);
644 return bytes_copied;
645 }
646
647 bytes_copied += size;
648 len -= size;
649 buf += size;
650
651 spin_lock_irqsave(&dev->lock, flags);
652
653 /* We've disconnected or reset so free the req and buffer */
654 if (dev->reset_printer) {
655 list_add(&req->list, &dev->tx_reqs);
656 spin_unlock_irqrestore(&dev->lock, flags);
657 mutex_unlock(&dev->lock_printer_io);
658 return -EAGAIN;
659 }
660
661 list_add(&req->list, &dev->tx_reqs_active);
662
663 /* here, we unlock, and only unlock, to avoid deadlock. */
664 spin_unlock(&dev->lock);
665 value = usb_ep_queue(dev->in_ep, req, GFP_ATOMIC);
666 spin_lock(&dev->lock);
667 if (value) {
668 list_del(&req->list);
669 list_add(&req->list, &dev->tx_reqs);
670 spin_unlock_irqrestore(&dev->lock, flags);
671 mutex_unlock(&dev->lock_printer_io);
672 return -EAGAIN;
673 }
674 }
675
676 spin_unlock_irqrestore(&dev->lock, flags);
677 mutex_unlock(&dev->lock_printer_io);
678
679 DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
680
681 if (bytes_copied)
682 return bytes_copied;
683 else
684 return -EAGAIN;
685 }
686
687 static int
688 printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync)
689 {
690 struct printer_dev *dev = fd->private_data;
691 struct inode *inode = file_inode(fd);
692 unsigned long flags;
693 int tx_list_empty;
694
695 inode_lock(inode);
696 spin_lock_irqsave(&dev->lock, flags);
697
698 if (dev->interface < 0) {
699 spin_unlock_irqrestore(&dev->lock, flags);
700 inode_unlock(inode);
701 return -ENODEV;
702 }
703
704 tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
705 spin_unlock_irqrestore(&dev->lock, flags);
706
707 if (!tx_list_empty) {
708 /* Sleep until all data has been sent */
709 wait_event_interruptible(dev->tx_flush_wait,
710 (likely(list_empty(&dev->tx_reqs_active))));
711 }
712 inode_unlock(inode);
713
714 return 0;
715 }
716
717 static __poll_t
718 printer_poll(struct file *fd, poll_table *wait)
719 {
720 struct printer_dev *dev = fd->private_data;
721 unsigned long flags;
722 __poll_t status = 0;
723
724 mutex_lock(&dev->lock_printer_io);
725 spin_lock_irqsave(&dev->lock, flags);
726
727 if (dev->interface < 0) {
728 spin_unlock_irqrestore(&dev->lock, flags);
729 mutex_unlock(&dev->lock_printer_io);
730 return EPOLLERR | EPOLLHUP;
731 }
732
733 setup_rx_reqs(dev);
734 spin_unlock_irqrestore(&dev->lock, flags);
735 mutex_unlock(&dev->lock_printer_io);
736
737 poll_wait(fd, &dev->rx_wait, wait);
738 poll_wait(fd, &dev->tx_wait, wait);
739
740 spin_lock_irqsave(&dev->lock, flags);
741 if (likely(!list_empty(&dev->tx_reqs)))
742 status |= EPOLLOUT | EPOLLWRNORM;
743
744 if (likely(dev->current_rx_bytes) ||
745 likely(!list_empty(&dev->rx_buffers)))
746 status |= EPOLLIN | EPOLLRDNORM;
747
748 spin_unlock_irqrestore(&dev->lock, flags);
749
750 return status;
751 }
752
753 static long
754 printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
755 {
756 struct printer_dev *dev = fd->private_data;
757 unsigned long flags;
758 int status = 0;
759
760 DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
761
762 /* handle ioctls */
763
764 spin_lock_irqsave(&dev->lock, flags);
765
766 if (dev->interface < 0) {
767 spin_unlock_irqrestore(&dev->lock, flags);
768 return -ENODEV;
769 }
770
771 switch (code) {
772 case GADGET_GET_PRINTER_STATUS:
773 status = (int)dev->printer_status;
774 break;
775 case GADGET_SET_PRINTER_STATUS:
776 dev->printer_status = (u8)arg;
777 break;
778 default:
779 /* could not handle ioctl */
780 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
781 code);
782 status = -ENOTTY;
783 }
784
785 spin_unlock_irqrestore(&dev->lock, flags);
786
787 return status;
788 }
789
790 /* used after endpoint configuration */
791 static const struct file_operations printer_io_operations = {
792 .owner = THIS_MODULE,
793 .open = printer_open,
794 .read = printer_read,
795 .write = printer_write,
796 .fsync = printer_fsync,
797 .poll = printer_poll,
798 .unlocked_ioctl = printer_ioctl,
799 .release = printer_close,
800 .llseek = noop_llseek,
801 };
802
803 /*-------------------------------------------------------------------------*/
804
805 static int
806 set_printer_interface(struct printer_dev *dev)
807 {
808 int result = 0;
809
810 dev->in_ep->desc = ep_desc(dev->gadget, &fs_ep_in_desc, &hs_ep_in_desc,
811 &ss_ep_in_desc);
812 dev->in_ep->driver_data = dev;
813
814 dev->out_ep->desc = ep_desc(dev->gadget, &fs_ep_out_desc,
815 &hs_ep_out_desc, &ss_ep_out_desc);
816 dev->out_ep->driver_data = dev;
817
818 result = usb_ep_enable(dev->in_ep);
819 if (result != 0) {
820 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
821 goto done;
822 }
823
824 result = usb_ep_enable(dev->out_ep);
825 if (result != 0) {
826 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
827 goto done;
828 }
829
830 done:
831 /* on error, disable any endpoints */
832 if (result != 0) {
833 (void) usb_ep_disable(dev->in_ep);
834 (void) usb_ep_disable(dev->out_ep);
835 dev->in_ep->desc = NULL;
836 dev->out_ep->desc = NULL;
837 }
838
839 /* caller is responsible for cleanup on error */
840 return result;
841 }
842
843 static void printer_reset_interface(struct printer_dev *dev)
844 {
845 unsigned long flags;
846
847 if (dev->interface < 0)
848 return;
849
850 DBG(dev, "%s\n", __func__);
851
852 if (dev->in_ep->desc)
853 usb_ep_disable(dev->in_ep);
854
855 if (dev->out_ep->desc)
856 usb_ep_disable(dev->out_ep);
857
858 spin_lock_irqsave(&dev->lock, flags);
859 dev->in_ep->desc = NULL;
860 dev->out_ep->desc = NULL;
861 dev->interface = -1;
862 spin_unlock_irqrestore(&dev->lock, flags);
863 }
864
865 /* Change our operational Interface. */
866 static int set_interface(struct printer_dev *dev, unsigned number)
867 {
868 int result = 0;
869
870 /* Free the current interface */
871 printer_reset_interface(dev);
872
873 result = set_printer_interface(dev);
874 if (result)
875 printer_reset_interface(dev);
876 else
877 dev->interface = number;
878
879 if (!result)
880 INFO(dev, "Using interface %x\n", number);
881
882 return result;
883 }
884
885 static void printer_soft_reset(struct printer_dev *dev)
886 {
887 struct usb_request *req;
888
889 INFO(dev, "Received Printer Reset Request\n");
890
891 if (usb_ep_disable(dev->in_ep))
892 DBG(dev, "Failed to disable USB in_ep\n");
893 if (usb_ep_disable(dev->out_ep))
894 DBG(dev, "Failed to disable USB out_ep\n");
895
896 if (dev->current_rx_req != NULL) {
897 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
898 dev->current_rx_req = NULL;
899 }
900 dev->current_rx_bytes = 0;
901 dev->current_rx_buf = NULL;
902 dev->reset_printer = 1;
903
904 while (likely(!(list_empty(&dev->rx_buffers)))) {
905 req = container_of(dev->rx_buffers.next, struct usb_request,
906 list);
907 list_del_init(&req->list);
908 list_add(&req->list, &dev->rx_reqs);
909 }
910
911 while (likely(!(list_empty(&dev->rx_reqs_active)))) {
912 req = container_of(dev->rx_buffers.next, struct usb_request,
913 list);
914 list_del_init(&req->list);
915 list_add(&req->list, &dev->rx_reqs);
916 }
917
918 while (likely(!(list_empty(&dev->tx_reqs_active)))) {
919 req = container_of(dev->tx_reqs_active.next,
920 struct usb_request, list);
921 list_del_init(&req->list);
922 list_add(&req->list, &dev->tx_reqs);
923 }
924
925 if (usb_ep_enable(dev->in_ep))
926 DBG(dev, "Failed to enable USB in_ep\n");
927 if (usb_ep_enable(dev->out_ep))
928 DBG(dev, "Failed to enable USB out_ep\n");
929
930 wake_up_interruptible(&dev->rx_wait);
931 wake_up_interruptible(&dev->tx_wait);
932 wake_up_interruptible(&dev->tx_flush_wait);
933 }
934
935 /*-------------------------------------------------------------------------*/
936
937 static bool gprinter_req_match(struct usb_function *f,
938 const struct usb_ctrlrequest *ctrl,
939 bool config0)
940 {
941 struct printer_dev *dev = func_to_printer(f);
942 u16 w_index = le16_to_cpu(ctrl->wIndex);
943 u16 w_value = le16_to_cpu(ctrl->wValue);
944 u16 w_length = le16_to_cpu(ctrl->wLength);
945
946 if (config0)
947 return false;
948
949 if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE ||
950 (ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
951 return false;
952
953 switch (ctrl->bRequest) {
954 case GET_DEVICE_ID:
955 w_index >>= 8;
956 if (USB_DIR_IN & ctrl->bRequestType)
957 break;
958 return false;
959 case GET_PORT_STATUS:
960 if (!w_value && w_length == 1 &&
961 (USB_DIR_IN & ctrl->bRequestType))
962 break;
963 return false;
964 case SOFT_RESET:
965 if (!w_value && !w_length &&
966 !(USB_DIR_IN & ctrl->bRequestType))
967 break;
968 fallthrough;
969 default:
970 return false;
971 }
972 return w_index == dev->interface;
973 }
974
975 /*
976 * The setup() callback implements all the ep0 functionality that's not
977 * handled lower down.
978 */
979 static int printer_func_setup(struct usb_function *f,
980 const struct usb_ctrlrequest *ctrl)
981 {
982 struct printer_dev *dev = func_to_printer(f);
983 struct usb_composite_dev *cdev = f->config->cdev;
984 struct usb_request *req = cdev->req;
985 u8 *buf = req->buf;
986 int value = -EOPNOTSUPP;
987 u16 wIndex = le16_to_cpu(ctrl->wIndex);
988 u16 wValue = le16_to_cpu(ctrl->wValue);
989 u16 wLength = le16_to_cpu(ctrl->wLength);
990
991 DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
992 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
993
994 switch (ctrl->bRequestType&USB_TYPE_MASK) {
995 case USB_TYPE_CLASS:
996 switch (ctrl->bRequest) {
997 case GET_DEVICE_ID: /* Get the IEEE-1284 PNP String */
998 /* Only one printer interface is supported. */
999 if ((wIndex>>8) != dev->interface)
1000 break;
1001
1002 if (!dev->pnp_string) {
1003 value = 0;
1004 break;
1005 }
1006 value = strlen(dev->pnp_string);
1007 buf[0] = (value >> 8) & 0xFF;
1008 buf[1] = value & 0xFF;
1009 memcpy(buf + 2, dev->pnp_string, value);
1010 DBG(dev, "1284 PNP String: %x %s\n", value,
1011 dev->pnp_string);
1012 break;
1013
1014 case GET_PORT_STATUS: /* Get Port Status */
1015 /* Only one printer interface is supported. */
1016 if (wIndex != dev->interface)
1017 break;
1018
1019 buf[0] = dev->printer_status;
1020 value = min_t(u16, wLength, 1);
1021 break;
1022
1023 case SOFT_RESET: /* Soft Reset */
1024 /* Only one printer interface is supported. */
1025 if (wIndex != dev->interface)
1026 break;
1027
1028 printer_soft_reset(dev);
1029
1030 value = 0;
1031 break;
1032
1033 default:
1034 goto unknown;
1035 }
1036 break;
1037
1038 default:
1039 unknown:
1040 VDBG(dev,
1041 "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1042 ctrl->bRequestType, ctrl->bRequest,
1043 wValue, wIndex, wLength);
1044 break;
1045 }
1046 /* host either stalls (value < 0) or reports success */
1047 if (value >= 0) {
1048 req->length = value;
1049 req->zero = value < wLength;
1050 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1051 if (value < 0) {
1052 ERROR(dev, "%s:%d Error!\n", __func__, __LINE__);
1053 req->status = 0;
1054 }
1055 }
1056 return value;
1057 }
1058
1059 static int printer_func_bind(struct usb_configuration *c,
1060 struct usb_function *f)
1061 {
1062 struct usb_gadget *gadget = c->cdev->gadget;
1063 struct printer_dev *dev = func_to_printer(f);
1064 struct device *pdev;
1065 struct usb_composite_dev *cdev = c->cdev;
1066 struct usb_ep *in_ep;
1067 struct usb_ep *out_ep = NULL;
1068 struct usb_request *req;
1069 dev_t devt;
1070 int id;
1071 int ret;
1072 u32 i;
1073
1074 id = usb_interface_id(c, f);
1075 if (id < 0)
1076 return id;
1077 intf_desc.bInterfaceNumber = id;
1078
1079 /* finish hookup to lower layer ... */
1080 dev->gadget = gadget;
1081
1082 /* all we really need is bulk IN/OUT */
1083 in_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_in_desc);
1084 if (!in_ep) {
1085 autoconf_fail:
1086 dev_err(&cdev->gadget->dev, "can't autoconfigure on %s\n",
1087 cdev->gadget->name);
1088 return -ENODEV;
1089 }
1090
1091 out_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_out_desc);
1092 if (!out_ep)
1093 goto autoconf_fail;
1094
1095 /* assumes that all endpoints are dual-speed */
1096 hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1097 hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1098 ss_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1099 ss_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1100
1101 ret = usb_assign_descriptors(f, fs_printer_function,
1102 hs_printer_function, ss_printer_function, NULL);
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
1148 fail_cdev_add:
1149 device_destroy(usb_gadget_class, devt);
1150
1151 fail_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
1158 fail_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
1170 static 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
1182 static void printer_func_disable(struct usb_function *f)
1183 {
1184 struct printer_dev *dev = func_to_printer(f);
1185
1186 DBG(dev, "%s\n", __func__);
1187
1188 printer_reset_interface(dev);
1189 }
1190
1191 static inline struct f_printer_opts
1192 *to_f_printer_opts(struct config_item *item)
1193 {
1194 return container_of(to_config_group(item), struct f_printer_opts,
1195 func_inst.group);
1196 }
1197
1198 static void printer_attr_release(struct config_item *item)
1199 {
1200 struct f_printer_opts *opts = to_f_printer_opts(item);
1201
1202 usb_put_function_instance(&opts->func_inst);
1203 }
1204
1205 static struct configfs_item_operations printer_item_ops = {
1206 .release = printer_attr_release,
1207 };
1208
1209 static ssize_t f_printer_opts_pnp_string_show(struct config_item *item,
1210 char *page)
1211 {
1212 struct f_printer_opts *opts = to_f_printer_opts(item);
1213 int result = 0;
1214
1215 mutex_lock(&opts->lock);
1216 if (!opts->pnp_string)
1217 goto unlock;
1218
1219 result = strlcpy(page, opts->pnp_string, PAGE_SIZE);
1220 if (result >= PAGE_SIZE) {
1221 result = PAGE_SIZE;
1222 } else if (page[result - 1] != '\n' && result + 1 < PAGE_SIZE) {
1223 page[result++] = '\n';
1224 page[result] = '\0';
1225 }
1226
1227 unlock:
1228 mutex_unlock(&opts->lock);
1229
1230 return result;
1231 }
1232
1233 static ssize_t f_printer_opts_pnp_string_store(struct config_item *item,
1234 const char *page, size_t len)
1235 {
1236 struct f_printer_opts *opts = to_f_printer_opts(item);
1237 char *new_pnp;
1238 int result;
1239
1240 mutex_lock(&opts->lock);
1241
1242 new_pnp = kstrndup(page, len, GFP_KERNEL);
1243 if (!new_pnp) {
1244 result = -ENOMEM;
1245 goto unlock;
1246 }
1247
1248 if (opts->pnp_string_allocated)
1249 kfree(opts->pnp_string);
1250
1251 opts->pnp_string_allocated = true;
1252 opts->pnp_string = new_pnp;
1253 result = len;
1254 unlock:
1255 mutex_unlock(&opts->lock);
1256
1257 return result;
1258 }
1259
1260 CONFIGFS_ATTR(f_printer_opts_, pnp_string);
1261
1262 static ssize_t f_printer_opts_q_len_show(struct config_item *item,
1263 char *page)
1264 {
1265 struct f_printer_opts *opts = to_f_printer_opts(item);
1266 int result;
1267
1268 mutex_lock(&opts->lock);
1269 result = sprintf(page, "%d\n", opts->q_len);
1270 mutex_unlock(&opts->lock);
1271
1272 return result;
1273 }
1274
1275 static ssize_t f_printer_opts_q_len_store(struct config_item *item,
1276 const char *page, size_t len)
1277 {
1278 struct f_printer_opts *opts = to_f_printer_opts(item);
1279 int ret;
1280 u16 num;
1281
1282 mutex_lock(&opts->lock);
1283 if (opts->refcnt) {
1284 ret = -EBUSY;
1285 goto end;
1286 }
1287
1288 ret = kstrtou16(page, 0, &num);
1289 if (ret)
1290 goto end;
1291
1292 opts->q_len = (unsigned)num;
1293 ret = len;
1294 end:
1295 mutex_unlock(&opts->lock);
1296 return ret;
1297 }
1298
1299 CONFIGFS_ATTR(f_printer_opts_, q_len);
1300
1301 static struct configfs_attribute *printer_attrs[] = {
1302 &f_printer_opts_attr_pnp_string,
1303 &f_printer_opts_attr_q_len,
1304 NULL,
1305 };
1306
1307 static const struct config_item_type printer_func_type = {
1308 .ct_item_ops = &printer_item_ops,
1309 .ct_attrs = printer_attrs,
1310 .ct_owner = THIS_MODULE,
1311 };
1312
1313 static inline int gprinter_get_minor(void)
1314 {
1315 int ret;
1316
1317 ret = ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL);
1318 if (ret >= PRINTER_MINORS) {
1319 ida_simple_remove(&printer_ida, ret);
1320 ret = -ENODEV;
1321 }
1322
1323 return ret;
1324 }
1325
1326 static inline void gprinter_put_minor(int minor)
1327 {
1328 ida_simple_remove(&printer_ida, minor);
1329 }
1330
1331 static int gprinter_setup(int);
1332 static void gprinter_cleanup(void);
1333
1334 static void gprinter_free_inst(struct usb_function_instance *f)
1335 {
1336 struct f_printer_opts *opts;
1337
1338 opts = container_of(f, struct f_printer_opts, func_inst);
1339
1340 mutex_lock(&printer_ida_lock);
1341
1342 gprinter_put_minor(opts->minor);
1343 if (ida_is_empty(&printer_ida))
1344 gprinter_cleanup();
1345
1346 mutex_unlock(&printer_ida_lock);
1347
1348 if (opts->pnp_string_allocated)
1349 kfree(opts->pnp_string);
1350 kfree(opts);
1351 }
1352
1353 static struct usb_function_instance *gprinter_alloc_inst(void)
1354 {
1355 struct f_printer_opts *opts;
1356 struct usb_function_instance *ret;
1357 int status = 0;
1358
1359 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1360 if (!opts)
1361 return ERR_PTR(-ENOMEM);
1362
1363 mutex_init(&opts->lock);
1364 opts->func_inst.free_func_inst = gprinter_free_inst;
1365 ret = &opts->func_inst;
1366
1367 mutex_lock(&printer_ida_lock);
1368
1369 if (ida_is_empty(&printer_ida)) {
1370 status = gprinter_setup(PRINTER_MINORS);
1371 if (status) {
1372 ret = ERR_PTR(status);
1373 kfree(opts);
1374 goto unlock;
1375 }
1376 }
1377
1378 opts->minor = gprinter_get_minor();
1379 if (opts->minor < 0) {
1380 ret = ERR_PTR(opts->minor);
1381 kfree(opts);
1382 if (ida_is_empty(&printer_ida))
1383 gprinter_cleanup();
1384 goto unlock;
1385 }
1386 config_group_init_type_name(&opts->func_inst.group, "",
1387 &printer_func_type);
1388
1389 unlock:
1390 mutex_unlock(&printer_ida_lock);
1391 return ret;
1392 }
1393
1394 static void gprinter_free(struct usb_function *f)
1395 {
1396 struct printer_dev *dev = func_to_printer(f);
1397 struct f_printer_opts *opts;
1398
1399 opts = container_of(f->fi, struct f_printer_opts, func_inst);
1400
1401 kref_put(&dev->kref, printer_dev_free);
1402 mutex_lock(&opts->lock);
1403 --opts->refcnt;
1404 mutex_unlock(&opts->lock);
1405 }
1406
1407 static void printer_func_unbind(struct usb_configuration *c,
1408 struct usb_function *f)
1409 {
1410 struct printer_dev *dev;
1411 struct usb_request *req;
1412
1413 dev = func_to_printer(f);
1414
1415 device_destroy(usb_gadget_class, MKDEV(major, dev->minor));
1416
1417 /* Remove Character Device */
1418 cdev_del(&dev->printer_cdev);
1419
1420 /* we must already have been disconnected ... no i/o may be active */
1421 WARN_ON(!list_empty(&dev->tx_reqs_active));
1422 WARN_ON(!list_empty(&dev->rx_reqs_active));
1423
1424 /* Free all memory for this driver. */
1425 while (!list_empty(&dev->tx_reqs)) {
1426 req = container_of(dev->tx_reqs.next, struct usb_request,
1427 list);
1428 list_del(&req->list);
1429 printer_req_free(dev->in_ep, req);
1430 }
1431
1432 if (dev->current_rx_req != NULL)
1433 printer_req_free(dev->out_ep, dev->current_rx_req);
1434
1435 while (!list_empty(&dev->rx_reqs)) {
1436 req = container_of(dev->rx_reqs.next,
1437 struct usb_request, list);
1438 list_del(&req->list);
1439 printer_req_free(dev->out_ep, req);
1440 }
1441
1442 while (!list_empty(&dev->rx_buffers)) {
1443 req = container_of(dev->rx_buffers.next,
1444 struct usb_request, list);
1445 list_del(&req->list);
1446 printer_req_free(dev->out_ep, req);
1447 }
1448 usb_free_all_descriptors(f);
1449 }
1450
1451 static struct usb_function *gprinter_alloc(struct usb_function_instance *fi)
1452 {
1453 struct printer_dev *dev;
1454 struct f_printer_opts *opts;
1455
1456 opts = container_of(fi, struct f_printer_opts, func_inst);
1457
1458 mutex_lock(&opts->lock);
1459 if (opts->minor >= minors) {
1460 mutex_unlock(&opts->lock);
1461 return ERR_PTR(-ENOENT);
1462 }
1463
1464 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1465 if (!dev) {
1466 mutex_unlock(&opts->lock);
1467 return ERR_PTR(-ENOMEM);
1468 }
1469
1470 kref_init(&dev->kref);
1471 ++opts->refcnt;
1472 dev->minor = opts->minor;
1473 dev->pnp_string = opts->pnp_string;
1474 dev->q_len = opts->q_len;
1475 mutex_unlock(&opts->lock);
1476
1477 dev->function.name = "printer";
1478 dev->function.bind = printer_func_bind;
1479 dev->function.setup = printer_func_setup;
1480 dev->function.unbind = printer_func_unbind;
1481 dev->function.set_alt = printer_func_set_alt;
1482 dev->function.disable = printer_func_disable;
1483 dev->function.req_match = gprinter_req_match;
1484 dev->function.free_func = gprinter_free;
1485
1486 INIT_LIST_HEAD(&dev->tx_reqs);
1487 INIT_LIST_HEAD(&dev->rx_reqs);
1488 INIT_LIST_HEAD(&dev->rx_buffers);
1489 INIT_LIST_HEAD(&dev->tx_reqs_active);
1490 INIT_LIST_HEAD(&dev->rx_reqs_active);
1491
1492 spin_lock_init(&dev->lock);
1493 mutex_init(&dev->lock_printer_io);
1494 init_waitqueue_head(&dev->rx_wait);
1495 init_waitqueue_head(&dev->tx_wait);
1496 init_waitqueue_head(&dev->tx_flush_wait);
1497
1498 dev->interface = -1;
1499 dev->printer_cdev_open = 0;
1500 dev->printer_status = PRINTER_NOT_ERROR;
1501 dev->current_rx_req = NULL;
1502 dev->current_rx_bytes = 0;
1503 dev->current_rx_buf = NULL;
1504
1505 return &dev->function;
1506 }
1507
1508 DECLARE_USB_FUNCTION_INIT(printer, gprinter_alloc_inst, gprinter_alloc);
1509 MODULE_LICENSE("GPL");
1510 MODULE_AUTHOR("Craig Nadler");
1511
1512 static int gprinter_setup(int count)
1513 {
1514 int status;
1515 dev_t devt;
1516
1517 usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1518 if (IS_ERR(usb_gadget_class)) {
1519 status = PTR_ERR(usb_gadget_class);
1520 usb_gadget_class = NULL;
1521 pr_err("unable to create usb_gadget class %d\n", status);
1522 return status;
1523 }
1524
1525 status = alloc_chrdev_region(&devt, 0, count, "USB printer gadget");
1526 if (status) {
1527 pr_err("alloc_chrdev_region %d\n", status);
1528 class_destroy(usb_gadget_class);
1529 usb_gadget_class = NULL;
1530 return status;
1531 }
1532
1533 major = MAJOR(devt);
1534 minors = count;
1535
1536 return status;
1537 }
1538
1539 static void gprinter_cleanup(void)
1540 {
1541 if (major) {
1542 unregister_chrdev_region(MKDEV(major, 0), minors);
1543 major = minors = 0;
1544 }
1545 class_destroy(usb_gadget_class);
1546 usb_gadget_class = NULL;
1547 }
Linux with added FPC-III support