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b185f01a AP |
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> | |
b26394bd | 27 | #include <linux/idr.h> |
b185f01a AP |
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 | ||
b26394bd AP |
50 | #include "u_printer.h" |
51 | ||
b185f01a AP |
52 | #define PNP_STRING_LEN 1024 |
53 | #define PRINTER_MINORS 4 | |
54 | #define GET_DEVICE_ID 0 | |
55 | #define GET_PORT_STATUS 1 | |
56 | #define SOFT_RESET 2 | |
57 | ||
58 | static int major, minors; | |
59 | static struct class *usb_gadget_class; | |
b26394bd AP |
60 | static DEFINE_IDA(printer_ida); |
61 | static DEFINE_MUTEX(printer_ida_lock); /* protects access do printer_ida */ | |
b185f01a AP |
62 | |
63 | /*-------------------------------------------------------------------------*/ | |
64 | ||
65 | struct printer_dev { | |
66 | spinlock_t lock; /* lock this structure */ | |
67 | /* lock buffer lists during read/write calls */ | |
68 | struct mutex lock_printer_io; | |
69 | struct usb_gadget *gadget; | |
70 | s8 interface; | |
71 | struct usb_ep *in_ep, *out_ep; | |
72 | ||
73 | struct list_head rx_reqs; /* List of free RX structs */ | |
74 | struct list_head rx_reqs_active; /* List of Active RX xfers */ | |
75 | struct list_head rx_buffers; /* List of completed xfers */ | |
76 | /* wait until there is data to be read. */ | |
77 | wait_queue_head_t rx_wait; | |
78 | struct list_head tx_reqs; /* List of free TX structs */ | |
79 | struct list_head tx_reqs_active; /* List of Active TX xfers */ | |
80 | /* Wait until there are write buffers available to use. */ | |
81 | wait_queue_head_t tx_wait; | |
82 | /* Wait until all write buffers have been sent. */ | |
83 | wait_queue_head_t tx_flush_wait; | |
84 | struct usb_request *current_rx_req; | |
85 | size_t current_rx_bytes; | |
86 | u8 *current_rx_buf; | |
87 | u8 printer_status; | |
88 | u8 reset_printer; | |
89 | int minor; | |
90 | struct cdev printer_cdev; | |
91 | u8 printer_cdev_open; | |
92 | wait_queue_head_t wait; | |
93 | unsigned q_len; | |
94 | char *pnp_string; /* We don't own memory! */ | |
95 | struct usb_function function; | |
96 | }; | |
97 | ||
98 | static inline struct printer_dev *func_to_printer(struct usb_function *f) | |
99 | { | |
100 | return container_of(f, struct printer_dev, function); | |
101 | } | |
102 | ||
103 | /*-------------------------------------------------------------------------*/ | |
104 | ||
105 | /* | |
106 | * DESCRIPTORS ... most are static, but strings and (full) configuration | |
107 | * descriptors are built on demand. | |
108 | */ | |
109 | ||
110 | /* holds our biggest descriptor */ | |
111 | #define USB_DESC_BUFSIZE 256 | |
112 | #define USB_BUFSIZE 8192 | |
113 | ||
114 | static struct usb_interface_descriptor intf_desc = { | |
115 | .bLength = sizeof(intf_desc), | |
116 | .bDescriptorType = USB_DT_INTERFACE, | |
117 | .bNumEndpoints = 2, | |
118 | .bInterfaceClass = USB_CLASS_PRINTER, | |
119 | .bInterfaceSubClass = 1, /* Printer Sub-Class */ | |
120 | .bInterfaceProtocol = 2, /* Bi-Directional */ | |
121 | .iInterface = 0 | |
122 | }; | |
123 | ||
124 | static struct usb_endpoint_descriptor fs_ep_in_desc = { | |
125 | .bLength = USB_DT_ENDPOINT_SIZE, | |
126 | .bDescriptorType = USB_DT_ENDPOINT, | |
127 | .bEndpointAddress = USB_DIR_IN, | |
128 | .bmAttributes = USB_ENDPOINT_XFER_BULK | |
129 | }; | |
130 | ||
131 | static struct usb_endpoint_descriptor fs_ep_out_desc = { | |
132 | .bLength = USB_DT_ENDPOINT_SIZE, | |
133 | .bDescriptorType = USB_DT_ENDPOINT, | |
134 | .bEndpointAddress = USB_DIR_OUT, | |
135 | .bmAttributes = USB_ENDPOINT_XFER_BULK | |
136 | }; | |
137 | ||
138 | static struct usb_descriptor_header *fs_printer_function[] = { | |
139 | (struct usb_descriptor_header *) &intf_desc, | |
140 | (struct usb_descriptor_header *) &fs_ep_in_desc, | |
141 | (struct usb_descriptor_header *) &fs_ep_out_desc, | |
142 | NULL | |
143 | }; | |
144 | ||
145 | /* | |
146 | * usb 2.0 devices need to expose both high speed and full speed | |
147 | * descriptors, unless they only run at full speed. | |
148 | */ | |
149 | ||
150 | static struct usb_endpoint_descriptor hs_ep_in_desc = { | |
151 | .bLength = USB_DT_ENDPOINT_SIZE, | |
152 | .bDescriptorType = USB_DT_ENDPOINT, | |
153 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
154 | .wMaxPacketSize = cpu_to_le16(512) | |
155 | }; | |
156 | ||
157 | static struct usb_endpoint_descriptor hs_ep_out_desc = { | |
158 | .bLength = USB_DT_ENDPOINT_SIZE, | |
159 | .bDescriptorType = USB_DT_ENDPOINT, | |
160 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
161 | .wMaxPacketSize = cpu_to_le16(512) | |
162 | }; | |
163 | ||
b185f01a AP |
164 | static struct usb_descriptor_header *hs_printer_function[] = { |
165 | (struct usb_descriptor_header *) &intf_desc, | |
166 | (struct usb_descriptor_header *) &hs_ep_in_desc, | |
167 | (struct usb_descriptor_header *) &hs_ep_out_desc, | |
168 | NULL | |
169 | }; | |
170 | ||
171 | /* | |
172 | * Added endpoint descriptors for 3.0 devices | |
173 | */ | |
174 | ||
175 | static struct usb_endpoint_descriptor ss_ep_in_desc = { | |
176 | .bLength = USB_DT_ENDPOINT_SIZE, | |
177 | .bDescriptorType = USB_DT_ENDPOINT, | |
178 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
179 | .wMaxPacketSize = cpu_to_le16(1024), | |
180 | }; | |
181 | ||
182 | static struct usb_ss_ep_comp_descriptor ss_ep_in_comp_desc = { | |
183 | .bLength = sizeof(ss_ep_in_comp_desc), | |
184 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
185 | }; | |
186 | ||
187 | static struct usb_endpoint_descriptor ss_ep_out_desc = { | |
188 | .bLength = USB_DT_ENDPOINT_SIZE, | |
189 | .bDescriptorType = USB_DT_ENDPOINT, | |
190 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
191 | .wMaxPacketSize = cpu_to_le16(1024), | |
192 | }; | |
193 | ||
194 | static struct usb_ss_ep_comp_descriptor ss_ep_out_comp_desc = { | |
195 | .bLength = sizeof(ss_ep_out_comp_desc), | |
196 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
197 | }; | |
198 | ||
199 | static struct usb_descriptor_header *ss_printer_function[] = { | |
200 | (struct usb_descriptor_header *) &intf_desc, | |
201 | (struct usb_descriptor_header *) &ss_ep_in_desc, | |
202 | (struct usb_descriptor_header *) &ss_ep_in_comp_desc, | |
203 | (struct usb_descriptor_header *) &ss_ep_out_desc, | |
204 | (struct usb_descriptor_header *) &ss_ep_out_comp_desc, | |
205 | NULL | |
206 | }; | |
207 | ||
208 | /* maxpacket and other transfer characteristics vary by speed. */ | |
209 | static inline struct usb_endpoint_descriptor *ep_desc(struct usb_gadget *gadget, | |
210 | struct usb_endpoint_descriptor *fs, | |
211 | struct usb_endpoint_descriptor *hs, | |
212 | struct usb_endpoint_descriptor *ss) | |
213 | { | |
214 | switch (gadget->speed) { | |
215 | case USB_SPEED_SUPER: | |
216 | return ss; | |
217 | case USB_SPEED_HIGH: | |
218 | return hs; | |
219 | default: | |
220 | return fs; | |
221 | } | |
222 | } | |
223 | ||
224 | /*-------------------------------------------------------------------------*/ | |
225 | ||
226 | static struct usb_request * | |
227 | printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags) | |
228 | { | |
229 | struct usb_request *req; | |
230 | ||
231 | req = usb_ep_alloc_request(ep, gfp_flags); | |
232 | ||
233 | if (req != NULL) { | |
234 | req->length = len; | |
235 | req->buf = kmalloc(len, gfp_flags); | |
236 | if (req->buf == NULL) { | |
237 | usb_ep_free_request(ep, req); | |
238 | return NULL; | |
239 | } | |
240 | } | |
241 | ||
242 | return req; | |
243 | } | |
244 | ||
245 | static void | |
246 | printer_req_free(struct usb_ep *ep, struct usb_request *req) | |
247 | { | |
248 | if (ep != NULL && req != NULL) { | |
249 | kfree(req->buf); | |
250 | usb_ep_free_request(ep, req); | |
251 | } | |
252 | } | |
253 | ||
254 | /*-------------------------------------------------------------------------*/ | |
255 | ||
256 | static void rx_complete(struct usb_ep *ep, struct usb_request *req) | |
257 | { | |
258 | struct printer_dev *dev = ep->driver_data; | |
259 | int status = req->status; | |
260 | unsigned long flags; | |
261 | ||
262 | spin_lock_irqsave(&dev->lock, flags); | |
263 | ||
264 | list_del_init(&req->list); /* Remode from Active List */ | |
265 | ||
266 | switch (status) { | |
267 | ||
268 | /* normal completion */ | |
269 | case 0: | |
270 | if (req->actual > 0) { | |
271 | list_add_tail(&req->list, &dev->rx_buffers); | |
272 | DBG(dev, "G_Printer : rx length %d\n", req->actual); | |
273 | } else { | |
274 | list_add(&req->list, &dev->rx_reqs); | |
275 | } | |
276 | break; | |
277 | ||
278 | /* software-driven interface shutdown */ | |
279 | case -ECONNRESET: /* unlink */ | |
280 | case -ESHUTDOWN: /* disconnect etc */ | |
281 | VDBG(dev, "rx shutdown, code %d\n", status); | |
282 | list_add(&req->list, &dev->rx_reqs); | |
283 | break; | |
284 | ||
285 | /* for hardware automagic (such as pxa) */ | |
286 | case -ECONNABORTED: /* endpoint reset */ | |
287 | DBG(dev, "rx %s reset\n", ep->name); | |
288 | list_add(&req->list, &dev->rx_reqs); | |
289 | break; | |
290 | ||
291 | /* data overrun */ | |
292 | case -EOVERFLOW: | |
293 | /* FALLTHROUGH */ | |
294 | ||
295 | default: | |
296 | DBG(dev, "rx status %d\n", status); | |
297 | list_add(&req->list, &dev->rx_reqs); | |
298 | break; | |
299 | } | |
300 | ||
301 | wake_up_interruptible(&dev->rx_wait); | |
302 | spin_unlock_irqrestore(&dev->lock, flags); | |
303 | } | |
304 | ||
305 | static void tx_complete(struct usb_ep *ep, struct usb_request *req) | |
306 | { | |
307 | struct printer_dev *dev = ep->driver_data; | |
308 | ||
309 | switch (req->status) { | |
310 | default: | |
311 | VDBG(dev, "tx err %d\n", req->status); | |
312 | /* FALLTHROUGH */ | |
313 | case -ECONNRESET: /* unlink */ | |
314 | case -ESHUTDOWN: /* disconnect etc */ | |
315 | break; | |
316 | case 0: | |
317 | break; | |
318 | } | |
319 | ||
320 | spin_lock(&dev->lock); | |
321 | /* Take the request struct off the active list and put it on the | |
322 | * free list. | |
323 | */ | |
324 | list_del_init(&req->list); | |
325 | list_add(&req->list, &dev->tx_reqs); | |
326 | wake_up_interruptible(&dev->tx_wait); | |
327 | if (likely(list_empty(&dev->tx_reqs_active))) | |
328 | wake_up_interruptible(&dev->tx_flush_wait); | |
329 | ||
330 | spin_unlock(&dev->lock); | |
331 | } | |
332 | ||
333 | /*-------------------------------------------------------------------------*/ | |
334 | ||
335 | static int | |
336 | printer_open(struct inode *inode, struct file *fd) | |
337 | { | |
338 | struct printer_dev *dev; | |
339 | unsigned long flags; | |
340 | int ret = -EBUSY; | |
341 | ||
342 | dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev); | |
343 | ||
344 | spin_lock_irqsave(&dev->lock, flags); | |
345 | ||
346 | if (!dev->printer_cdev_open) { | |
347 | dev->printer_cdev_open = 1; | |
348 | fd->private_data = dev; | |
349 | ret = 0; | |
350 | /* Change the printer status to show that it's on-line. */ | |
351 | dev->printer_status |= PRINTER_SELECTED; | |
352 | } | |
353 | ||
354 | spin_unlock_irqrestore(&dev->lock, flags); | |
355 | ||
356 | DBG(dev, "printer_open returned %x\n", ret); | |
357 | return ret; | |
358 | } | |
359 | ||
360 | static int | |
361 | printer_close(struct inode *inode, struct file *fd) | |
362 | { | |
363 | struct printer_dev *dev = fd->private_data; | |
364 | unsigned long flags; | |
365 | ||
366 | spin_lock_irqsave(&dev->lock, flags); | |
367 | dev->printer_cdev_open = 0; | |
368 | fd->private_data = NULL; | |
369 | /* Change printer status to show that the printer is off-line. */ | |
370 | dev->printer_status &= ~PRINTER_SELECTED; | |
371 | spin_unlock_irqrestore(&dev->lock, flags); | |
372 | ||
373 | DBG(dev, "printer_close\n"); | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | /* This function must be called with interrupts turned off. */ | |
379 | static void | |
380 | setup_rx_reqs(struct printer_dev *dev) | |
381 | { | |
382 | struct usb_request *req; | |
383 | ||
384 | while (likely(!list_empty(&dev->rx_reqs))) { | |
385 | int error; | |
386 | ||
387 | req = container_of(dev->rx_reqs.next, | |
388 | struct usb_request, list); | |
389 | list_del_init(&req->list); | |
390 | ||
391 | /* The USB Host sends us whatever amount of data it wants to | |
392 | * so we always set the length field to the full USB_BUFSIZE. | |
393 | * If the amount of data is more than the read() caller asked | |
394 | * for it will be stored in the request buffer until it is | |
395 | * asked for by read(). | |
396 | */ | |
397 | req->length = USB_BUFSIZE; | |
398 | req->complete = rx_complete; | |
399 | ||
400 | /* here, we unlock, and only unlock, to avoid deadlock. */ | |
401 | spin_unlock(&dev->lock); | |
402 | error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC); | |
403 | spin_lock(&dev->lock); | |
404 | if (error) { | |
405 | DBG(dev, "rx submit --> %d\n", error); | |
406 | list_add(&req->list, &dev->rx_reqs); | |
407 | break; | |
408 | } | |
409 | /* if the req is empty, then add it into dev->rx_reqs_active. */ | |
410 | else if (list_empty(&req->list)) | |
411 | list_add(&req->list, &dev->rx_reqs_active); | |
412 | } | |
413 | } | |
414 | ||
415 | static ssize_t | |
416 | printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr) | |
417 | { | |
418 | struct printer_dev *dev = fd->private_data; | |
419 | unsigned long flags; | |
420 | size_t size; | |
421 | size_t bytes_copied; | |
422 | struct usb_request *req; | |
423 | /* This is a pointer to the current USB rx request. */ | |
424 | struct usb_request *current_rx_req; | |
425 | /* This is the number of bytes in the current rx buffer. */ | |
426 | size_t current_rx_bytes; | |
427 | /* This is a pointer to the current rx buffer. */ | |
428 | u8 *current_rx_buf; | |
429 | ||
430 | if (len == 0) | |
431 | return -EINVAL; | |
432 | ||
433 | DBG(dev, "printer_read trying to read %d bytes\n", (int)len); | |
434 | ||
435 | mutex_lock(&dev->lock_printer_io); | |
436 | spin_lock_irqsave(&dev->lock, flags); | |
437 | ||
438 | /* We will use this flag later to check if a printer reset happened | |
439 | * after we turn interrupts back on. | |
440 | */ | |
441 | dev->reset_printer = 0; | |
442 | ||
443 | setup_rx_reqs(dev); | |
444 | ||
445 | bytes_copied = 0; | |
446 | current_rx_req = dev->current_rx_req; | |
447 | current_rx_bytes = dev->current_rx_bytes; | |
448 | current_rx_buf = dev->current_rx_buf; | |
449 | dev->current_rx_req = NULL; | |
450 | dev->current_rx_bytes = 0; | |
451 | dev->current_rx_buf = NULL; | |
452 | ||
453 | /* Check if there is any data in the read buffers. Please note that | |
454 | * current_rx_bytes is the number of bytes in the current rx buffer. | |
455 | * If it is zero then check if there are any other rx_buffers that | |
456 | * are on the completed list. We are only out of data if all rx | |
457 | * buffers are empty. | |
458 | */ | |
459 | if ((current_rx_bytes == 0) && | |
460 | (likely(list_empty(&dev->rx_buffers)))) { | |
461 | /* Turn interrupts back on before sleeping. */ | |
462 | spin_unlock_irqrestore(&dev->lock, flags); | |
463 | ||
464 | /* | |
465 | * If no data is available check if this is a NON-Blocking | |
466 | * call or not. | |
467 | */ | |
468 | if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { | |
469 | mutex_unlock(&dev->lock_printer_io); | |
470 | return -EAGAIN; | |
471 | } | |
472 | ||
473 | /* Sleep until data is available */ | |
474 | wait_event_interruptible(dev->rx_wait, | |
475 | (likely(!list_empty(&dev->rx_buffers)))); | |
476 | spin_lock_irqsave(&dev->lock, flags); | |
477 | } | |
478 | ||
479 | /* We have data to return then copy it to the caller's buffer.*/ | |
480 | while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers))) | |
481 | && len) { | |
482 | if (current_rx_bytes == 0) { | |
483 | req = container_of(dev->rx_buffers.next, | |
484 | struct usb_request, list); | |
485 | list_del_init(&req->list); | |
486 | ||
487 | if (req->actual && req->buf) { | |
488 | current_rx_req = req; | |
489 | current_rx_bytes = req->actual; | |
490 | current_rx_buf = req->buf; | |
491 | } else { | |
492 | list_add(&req->list, &dev->rx_reqs); | |
493 | continue; | |
494 | } | |
495 | } | |
496 | ||
497 | /* Don't leave irqs off while doing memory copies */ | |
498 | spin_unlock_irqrestore(&dev->lock, flags); | |
499 | ||
500 | if (len > current_rx_bytes) | |
501 | size = current_rx_bytes; | |
502 | else | |
503 | size = len; | |
504 | ||
505 | size -= copy_to_user(buf, current_rx_buf, size); | |
506 | bytes_copied += size; | |
507 | len -= size; | |
508 | buf += size; | |
509 | ||
510 | spin_lock_irqsave(&dev->lock, flags); | |
511 | ||
512 | /* We've disconnected or reset so return. */ | |
513 | if (dev->reset_printer) { | |
514 | list_add(¤t_rx_req->list, &dev->rx_reqs); | |
515 | spin_unlock_irqrestore(&dev->lock, flags); | |
516 | mutex_unlock(&dev->lock_printer_io); | |
517 | return -EAGAIN; | |
518 | } | |
519 | ||
520 | /* If we not returning all the data left in this RX request | |
521 | * buffer then adjust the amount of data left in the buffer. | |
522 | * Othewise if we are done with this RX request buffer then | |
523 | * requeue it to get any incoming data from the USB host. | |
524 | */ | |
525 | if (size < current_rx_bytes) { | |
526 | current_rx_bytes -= size; | |
527 | current_rx_buf += size; | |
528 | } else { | |
529 | list_add(¤t_rx_req->list, &dev->rx_reqs); | |
530 | current_rx_bytes = 0; | |
531 | current_rx_buf = NULL; | |
532 | current_rx_req = NULL; | |
533 | } | |
534 | } | |
535 | ||
536 | dev->current_rx_req = current_rx_req; | |
537 | dev->current_rx_bytes = current_rx_bytes; | |
538 | dev->current_rx_buf = current_rx_buf; | |
539 | ||
540 | spin_unlock_irqrestore(&dev->lock, flags); | |
541 | mutex_unlock(&dev->lock_printer_io); | |
542 | ||
543 | DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied); | |
544 | ||
545 | if (bytes_copied) | |
546 | return bytes_copied; | |
547 | else | |
548 | return -EAGAIN; | |
549 | } | |
550 | ||
551 | static ssize_t | |
552 | printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr) | |
553 | { | |
554 | struct printer_dev *dev = fd->private_data; | |
555 | unsigned long flags; | |
556 | size_t size; /* Amount of data in a TX request. */ | |
557 | size_t bytes_copied = 0; | |
558 | struct usb_request *req; | |
559 | ||
560 | DBG(dev, "printer_write trying to send %d bytes\n", (int)len); | |
561 | ||
562 | if (len == 0) | |
563 | return -EINVAL; | |
564 | ||
565 | mutex_lock(&dev->lock_printer_io); | |
566 | spin_lock_irqsave(&dev->lock, flags); | |
567 | ||
568 | /* Check if a printer reset happens while we have interrupts on */ | |
569 | dev->reset_printer = 0; | |
570 | ||
571 | /* Check if there is any available write buffers */ | |
572 | if (likely(list_empty(&dev->tx_reqs))) { | |
573 | /* Turn interrupts back on before sleeping. */ | |
574 | spin_unlock_irqrestore(&dev->lock, flags); | |
575 | ||
576 | /* | |
577 | * If write buffers are available check if this is | |
578 | * a NON-Blocking call or not. | |
579 | */ | |
580 | if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { | |
581 | mutex_unlock(&dev->lock_printer_io); | |
582 | return -EAGAIN; | |
583 | } | |
584 | ||
585 | /* Sleep until a write buffer is available */ | |
586 | wait_event_interruptible(dev->tx_wait, | |
587 | (likely(!list_empty(&dev->tx_reqs)))); | |
588 | spin_lock_irqsave(&dev->lock, flags); | |
589 | } | |
590 | ||
591 | while (likely(!list_empty(&dev->tx_reqs)) && len) { | |
592 | ||
593 | if (len > USB_BUFSIZE) | |
594 | size = USB_BUFSIZE; | |
595 | else | |
596 | size = len; | |
597 | ||
598 | req = container_of(dev->tx_reqs.next, struct usb_request, | |
599 | list); | |
600 | list_del_init(&req->list); | |
601 | ||
602 | req->complete = tx_complete; | |
603 | req->length = size; | |
604 | ||
605 | /* Check if we need to send a zero length packet. */ | |
606 | if (len > size) | |
607 | /* They will be more TX requests so no yet. */ | |
608 | req->zero = 0; | |
609 | else | |
610 | /* If the data amount is not a multiple of the | |
611 | * maxpacket size then send a zero length packet. | |
612 | */ | |
613 | req->zero = ((len % dev->in_ep->maxpacket) == 0); | |
614 | ||
615 | /* Don't leave irqs off while doing memory copies */ | |
616 | spin_unlock_irqrestore(&dev->lock, flags); | |
617 | ||
618 | if (copy_from_user(req->buf, buf, size)) { | |
619 | list_add(&req->list, &dev->tx_reqs); | |
620 | mutex_unlock(&dev->lock_printer_io); | |
621 | return bytes_copied; | |
622 | } | |
623 | ||
624 | bytes_copied += size; | |
625 | len -= size; | |
626 | buf += size; | |
627 | ||
628 | spin_lock_irqsave(&dev->lock, flags); | |
629 | ||
630 | /* We've disconnected or reset so free the req and buffer */ | |
631 | if (dev->reset_printer) { | |
632 | list_add(&req->list, &dev->tx_reqs); | |
633 | spin_unlock_irqrestore(&dev->lock, flags); | |
634 | mutex_unlock(&dev->lock_printer_io); | |
635 | return -EAGAIN; | |
636 | } | |
637 | ||
638 | if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) { | |
639 | list_add(&req->list, &dev->tx_reqs); | |
640 | spin_unlock_irqrestore(&dev->lock, flags); | |
641 | mutex_unlock(&dev->lock_printer_io); | |
642 | return -EAGAIN; | |
643 | } | |
644 | ||
645 | list_add(&req->list, &dev->tx_reqs_active); | |
646 | ||
647 | } | |
648 | ||
649 | spin_unlock_irqrestore(&dev->lock, flags); | |
650 | mutex_unlock(&dev->lock_printer_io); | |
651 | ||
652 | DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied); | |
653 | ||
654 | if (bytes_copied) | |
655 | return bytes_copied; | |
656 | else | |
657 | return -EAGAIN; | |
658 | } | |
659 | ||
660 | static int | |
661 | printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync) | |
662 | { | |
663 | struct printer_dev *dev = fd->private_data; | |
664 | struct inode *inode = file_inode(fd); | |
665 | unsigned long flags; | |
666 | int tx_list_empty; | |
667 | ||
5955102c | 668 | inode_lock(inode); |
b185f01a AP |
669 | spin_lock_irqsave(&dev->lock, flags); |
670 | tx_list_empty = (likely(list_empty(&dev->tx_reqs))); | |
671 | spin_unlock_irqrestore(&dev->lock, flags); | |
672 | ||
673 | if (!tx_list_empty) { | |
674 | /* Sleep until all data has been sent */ | |
675 | wait_event_interruptible(dev->tx_flush_wait, | |
676 | (likely(list_empty(&dev->tx_reqs_active)))); | |
677 | } | |
5955102c | 678 | inode_unlock(inode); |
b185f01a AP |
679 | |
680 | return 0; | |
681 | } | |
682 | ||
683 | static unsigned int | |
684 | printer_poll(struct file *fd, poll_table *wait) | |
685 | { | |
686 | struct printer_dev *dev = fd->private_data; | |
687 | unsigned long flags; | |
688 | int status = 0; | |
689 | ||
690 | mutex_lock(&dev->lock_printer_io); | |
691 | spin_lock_irqsave(&dev->lock, flags); | |
692 | setup_rx_reqs(dev); | |
693 | spin_unlock_irqrestore(&dev->lock, flags); | |
694 | mutex_unlock(&dev->lock_printer_io); | |
695 | ||
696 | poll_wait(fd, &dev->rx_wait, wait); | |
697 | poll_wait(fd, &dev->tx_wait, wait); | |
698 | ||
699 | spin_lock_irqsave(&dev->lock, flags); | |
700 | if (likely(!list_empty(&dev->tx_reqs))) | |
701 | status |= POLLOUT | POLLWRNORM; | |
702 | ||
703 | if (likely(dev->current_rx_bytes) || | |
704 | likely(!list_empty(&dev->rx_buffers))) | |
705 | status |= POLLIN | POLLRDNORM; | |
706 | ||
707 | spin_unlock_irqrestore(&dev->lock, flags); | |
708 | ||
709 | return status; | |
710 | } | |
711 | ||
712 | static long | |
713 | printer_ioctl(struct file *fd, unsigned int code, unsigned long arg) | |
714 | { | |
715 | struct printer_dev *dev = fd->private_data; | |
716 | unsigned long flags; | |
717 | int status = 0; | |
718 | ||
719 | DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg); | |
720 | ||
721 | /* handle ioctls */ | |
722 | ||
723 | spin_lock_irqsave(&dev->lock, flags); | |
724 | ||
725 | switch (code) { | |
726 | case GADGET_GET_PRINTER_STATUS: | |
727 | status = (int)dev->printer_status; | |
728 | break; | |
729 | case GADGET_SET_PRINTER_STATUS: | |
730 | dev->printer_status = (u8)arg; | |
731 | break; | |
732 | default: | |
733 | /* could not handle ioctl */ | |
734 | DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n", | |
735 | code); | |
736 | status = -ENOTTY; | |
737 | } | |
738 | ||
739 | spin_unlock_irqrestore(&dev->lock, flags); | |
740 | ||
741 | return status; | |
742 | } | |
743 | ||
744 | /* used after endpoint configuration */ | |
745 | static const struct file_operations printer_io_operations = { | |
746 | .owner = THIS_MODULE, | |
747 | .open = printer_open, | |
748 | .read = printer_read, | |
749 | .write = printer_write, | |
750 | .fsync = printer_fsync, | |
751 | .poll = printer_poll, | |
752 | .unlocked_ioctl = printer_ioctl, | |
753 | .release = printer_close, | |
754 | .llseek = noop_llseek, | |
755 | }; | |
756 | ||
757 | /*-------------------------------------------------------------------------*/ | |
758 | ||
759 | static int | |
760 | set_printer_interface(struct printer_dev *dev) | |
761 | { | |
762 | int result = 0; | |
763 | ||
764 | dev->in_ep->desc = ep_desc(dev->gadget, &fs_ep_in_desc, &hs_ep_in_desc, | |
765 | &ss_ep_in_desc); | |
766 | dev->in_ep->driver_data = dev; | |
767 | ||
768 | dev->out_ep->desc = ep_desc(dev->gadget, &fs_ep_out_desc, | |
769 | &hs_ep_out_desc, &ss_ep_out_desc); | |
770 | dev->out_ep->driver_data = dev; | |
771 | ||
772 | result = usb_ep_enable(dev->in_ep); | |
773 | if (result != 0) { | |
774 | DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result); | |
775 | goto done; | |
776 | } | |
777 | ||
778 | result = usb_ep_enable(dev->out_ep); | |
779 | if (result != 0) { | |
780 | DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result); | |
781 | goto done; | |
782 | } | |
783 | ||
784 | done: | |
785 | /* on error, disable any endpoints */ | |
786 | if (result != 0) { | |
787 | (void) usb_ep_disable(dev->in_ep); | |
788 | (void) usb_ep_disable(dev->out_ep); | |
789 | dev->in_ep->desc = NULL; | |
790 | dev->out_ep->desc = NULL; | |
791 | } | |
792 | ||
793 | /* caller is responsible for cleanup on error */ | |
794 | return result; | |
795 | } | |
796 | ||
797 | static void printer_reset_interface(struct printer_dev *dev) | |
798 | { | |
a24b071b FL |
799 | unsigned long flags; |
800 | ||
b185f01a AP |
801 | if (dev->interface < 0) |
802 | return; | |
803 | ||
804 | DBG(dev, "%s\n", __func__); | |
805 | ||
806 | if (dev->in_ep->desc) | |
807 | usb_ep_disable(dev->in_ep); | |
808 | ||
809 | if (dev->out_ep->desc) | |
810 | usb_ep_disable(dev->out_ep); | |
811 | ||
a24b071b | 812 | spin_lock_irqsave(&dev->lock, flags); |
b185f01a AP |
813 | dev->in_ep->desc = NULL; |
814 | dev->out_ep->desc = NULL; | |
815 | dev->interface = -1; | |
a24b071b | 816 | spin_unlock_irqrestore(&dev->lock, flags); |
b185f01a AP |
817 | } |
818 | ||
819 | /* Change our operational Interface. */ | |
820 | static int set_interface(struct printer_dev *dev, unsigned number) | |
821 | { | |
822 | int result = 0; | |
823 | ||
824 | /* Free the current interface */ | |
825 | printer_reset_interface(dev); | |
826 | ||
827 | result = set_printer_interface(dev); | |
828 | if (result) | |
829 | printer_reset_interface(dev); | |
830 | else | |
831 | dev->interface = number; | |
832 | ||
833 | if (!result) | |
834 | INFO(dev, "Using interface %x\n", number); | |
835 | ||
836 | return result; | |
837 | } | |
838 | ||
839 | static void printer_soft_reset(struct printer_dev *dev) | |
840 | { | |
841 | struct usb_request *req; | |
842 | ||
843 | INFO(dev, "Received Printer Reset Request\n"); | |
844 | ||
845 | if (usb_ep_disable(dev->in_ep)) | |
846 | DBG(dev, "Failed to disable USB in_ep\n"); | |
847 | if (usb_ep_disable(dev->out_ep)) | |
848 | DBG(dev, "Failed to disable USB out_ep\n"); | |
849 | ||
850 | if (dev->current_rx_req != NULL) { | |
851 | list_add(&dev->current_rx_req->list, &dev->rx_reqs); | |
852 | dev->current_rx_req = NULL; | |
853 | } | |
854 | dev->current_rx_bytes = 0; | |
855 | dev->current_rx_buf = NULL; | |
856 | dev->reset_printer = 1; | |
857 | ||
858 | while (likely(!(list_empty(&dev->rx_buffers)))) { | |
859 | req = container_of(dev->rx_buffers.next, struct usb_request, | |
860 | list); | |
861 | list_del_init(&req->list); | |
862 | list_add(&req->list, &dev->rx_reqs); | |
863 | } | |
864 | ||
865 | while (likely(!(list_empty(&dev->rx_reqs_active)))) { | |
866 | req = container_of(dev->rx_buffers.next, struct usb_request, | |
867 | list); | |
868 | list_del_init(&req->list); | |
869 | list_add(&req->list, &dev->rx_reqs); | |
870 | } | |
871 | ||
872 | while (likely(!(list_empty(&dev->tx_reqs_active)))) { | |
873 | req = container_of(dev->tx_reqs_active.next, | |
874 | struct usb_request, list); | |
875 | list_del_init(&req->list); | |
876 | list_add(&req->list, &dev->tx_reqs); | |
877 | } | |
878 | ||
879 | if (usb_ep_enable(dev->in_ep)) | |
880 | DBG(dev, "Failed to enable USB in_ep\n"); | |
881 | if (usb_ep_enable(dev->out_ep)) | |
882 | DBG(dev, "Failed to enable USB out_ep\n"); | |
883 | ||
884 | wake_up_interruptible(&dev->rx_wait); | |
885 | wake_up_interruptible(&dev->tx_wait); | |
886 | wake_up_interruptible(&dev->tx_flush_wait); | |
887 | } | |
888 | ||
889 | /*-------------------------------------------------------------------------*/ | |
890 | ||
891 | static bool gprinter_req_match(struct usb_function *f, | |
892 | const struct usb_ctrlrequest *ctrl) | |
893 | { | |
894 | struct printer_dev *dev = func_to_printer(f); | |
895 | u16 w_index = le16_to_cpu(ctrl->wIndex); | |
896 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
897 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
898 | ||
899 | if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE || | |
900 | (ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) | |
901 | return false; | |
902 | ||
903 | switch (ctrl->bRequest) { | |
904 | case GET_DEVICE_ID: | |
905 | w_index >>= 8; | |
906 | if (w_length <= PNP_STRING_LEN && | |
907 | (USB_DIR_IN & ctrl->bRequestType)) | |
908 | break; | |
909 | return false; | |
910 | case GET_PORT_STATUS: | |
911 | if (!w_value && w_length == 1 && | |
912 | (USB_DIR_IN & ctrl->bRequestType)) | |
913 | break; | |
914 | return false; | |
915 | case SOFT_RESET: | |
916 | if (!w_value && !w_length && | |
fbdecad9 | 917 | !(USB_DIR_IN & ctrl->bRequestType)) |
b185f01a AP |
918 | break; |
919 | /* fall through */ | |
920 | default: | |
921 | return false; | |
922 | } | |
923 | return w_index == dev->interface; | |
924 | } | |
925 | ||
926 | /* | |
927 | * The setup() callback implements all the ep0 functionality that's not | |
928 | * handled lower down. | |
929 | */ | |
930 | static int printer_func_setup(struct usb_function *f, | |
931 | const struct usb_ctrlrequest *ctrl) | |
932 | { | |
933 | struct printer_dev *dev = func_to_printer(f); | |
934 | struct usb_composite_dev *cdev = f->config->cdev; | |
935 | struct usb_request *req = cdev->req; | |
936 | int value = -EOPNOTSUPP; | |
937 | u16 wIndex = le16_to_cpu(ctrl->wIndex); | |
938 | u16 wValue = le16_to_cpu(ctrl->wValue); | |
939 | u16 wLength = le16_to_cpu(ctrl->wLength); | |
940 | ||
941 | DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n", | |
942 | ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength); | |
943 | ||
944 | switch (ctrl->bRequestType&USB_TYPE_MASK) { | |
945 | case USB_TYPE_CLASS: | |
946 | switch (ctrl->bRequest) { | |
947 | case GET_DEVICE_ID: /* Get the IEEE-1284 PNP String */ | |
948 | /* Only one printer interface is supported. */ | |
949 | if ((wIndex>>8) != dev->interface) | |
950 | break; | |
951 | ||
952 | value = (dev->pnp_string[0] << 8) | dev->pnp_string[1]; | |
953 | memcpy(req->buf, dev->pnp_string, value); | |
954 | DBG(dev, "1284 PNP String: %x %s\n", value, | |
955 | &dev->pnp_string[2]); | |
956 | break; | |
957 | ||
958 | case GET_PORT_STATUS: /* Get Port Status */ | |
959 | /* Only one printer interface is supported. */ | |
960 | if (wIndex != dev->interface) | |
961 | break; | |
962 | ||
963 | *(u8 *)req->buf = dev->printer_status; | |
964 | value = min_t(u16, wLength, 1); | |
965 | break; | |
966 | ||
967 | case SOFT_RESET: /* Soft Reset */ | |
968 | /* Only one printer interface is supported. */ | |
969 | if (wIndex != dev->interface) | |
970 | break; | |
971 | ||
972 | printer_soft_reset(dev); | |
973 | ||
974 | value = 0; | |
975 | break; | |
976 | ||
977 | default: | |
978 | goto unknown; | |
979 | } | |
980 | break; | |
981 | ||
982 | default: | |
983 | unknown: | |
984 | VDBG(dev, | |
985 | "unknown ctrl req%02x.%02x v%04x i%04x l%d\n", | |
986 | ctrl->bRequestType, ctrl->bRequest, | |
987 | wValue, wIndex, wLength); | |
988 | break; | |
989 | } | |
990 | /* host either stalls (value < 0) or reports success */ | |
991 | if (value >= 0) { | |
992 | req->length = value; | |
993 | req->zero = value < wLength; | |
994 | value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
995 | if (value < 0) { | |
996 | ERROR(dev, "%s:%d Error!\n", __func__, __LINE__); | |
997 | req->status = 0; | |
998 | } | |
999 | } | |
1000 | return value; | |
1001 | } | |
1002 | ||
b26394bd | 1003 | static int printer_func_bind(struct usb_configuration *c, |
b185f01a AP |
1004 | struct usb_function *f) |
1005 | { | |
1006 | struct usb_gadget *gadget = c->cdev->gadget; | |
1007 | struct printer_dev *dev = func_to_printer(f); | |
1008 | struct device *pdev; | |
1009 | struct usb_composite_dev *cdev = c->cdev; | |
1010 | struct usb_ep *in_ep; | |
1011 | struct usb_ep *out_ep = NULL; | |
1012 | struct usb_request *req; | |
1013 | dev_t devt; | |
1014 | int id; | |
1015 | int ret; | |
1016 | u32 i; | |
1017 | ||
1018 | id = usb_interface_id(c, f); | |
1019 | if (id < 0) | |
1020 | return id; | |
1021 | intf_desc.bInterfaceNumber = id; | |
1022 | ||
1023 | /* finish hookup to lower layer ... */ | |
1024 | dev->gadget = gadget; | |
1025 | ||
1026 | /* all we really need is bulk IN/OUT */ | |
1027 | in_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_in_desc); | |
1028 | if (!in_ep) { | |
1029 | autoconf_fail: | |
1030 | dev_err(&cdev->gadget->dev, "can't autoconfigure on %s\n", | |
1031 | cdev->gadget->name); | |
1032 | return -ENODEV; | |
1033 | } | |
b185f01a AP |
1034 | |
1035 | out_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_out_desc); | |
1036 | if (!out_ep) | |
1037 | goto autoconf_fail; | |
b185f01a AP |
1038 | |
1039 | /* assumes that all endpoints are dual-speed */ | |
1040 | hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress; | |
1041 | hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress; | |
1042 | ss_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress; | |
1043 | ss_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress; | |
1044 | ||
1045 | ret = usb_assign_descriptors(f, fs_printer_function, | |
eaef50c7 | 1046 | hs_printer_function, ss_printer_function, NULL); |
b185f01a AP |
1047 | if (ret) |
1048 | return ret; | |
1049 | ||
1050 | dev->in_ep = in_ep; | |
1051 | dev->out_ep = out_ep; | |
1052 | ||
1053 | ret = -ENOMEM; | |
1054 | for (i = 0; i < dev->q_len; i++) { | |
1055 | req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL); | |
1056 | if (!req) | |
1057 | goto fail_tx_reqs; | |
1058 | list_add(&req->list, &dev->tx_reqs); | |
1059 | } | |
1060 | ||
1061 | for (i = 0; i < dev->q_len; i++) { | |
1062 | req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL); | |
1063 | if (!req) | |
1064 | goto fail_rx_reqs; | |
1065 | list_add(&req->list, &dev->rx_reqs); | |
1066 | } | |
1067 | ||
1068 | /* Setup the sysfs files for the printer gadget. */ | |
1069 | devt = MKDEV(major, dev->minor); | |
1070 | pdev = device_create(usb_gadget_class, NULL, devt, | |
1071 | NULL, "g_printer%d", dev->minor); | |
1072 | if (IS_ERR(pdev)) { | |
1073 | ERROR(dev, "Failed to create device: g_printer\n"); | |
1074 | ret = PTR_ERR(pdev); | |
1075 | goto fail_rx_reqs; | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * Register a character device as an interface to a user mode | |
1080 | * program that handles the printer specific functionality. | |
1081 | */ | |
1082 | cdev_init(&dev->printer_cdev, &printer_io_operations); | |
1083 | dev->printer_cdev.owner = THIS_MODULE; | |
1084 | ret = cdev_add(&dev->printer_cdev, devt, 1); | |
1085 | if (ret) { | |
1086 | ERROR(dev, "Failed to open char device\n"); | |
1087 | goto fail_cdev_add; | |
1088 | } | |
1089 | ||
1090 | return 0; | |
1091 | ||
1092 | fail_cdev_add: | |
1093 | device_destroy(usb_gadget_class, devt); | |
1094 | ||
1095 | fail_rx_reqs: | |
1096 | while (!list_empty(&dev->rx_reqs)) { | |
1097 | req = container_of(dev->rx_reqs.next, struct usb_request, list); | |
1098 | list_del(&req->list); | |
1099 | printer_req_free(dev->out_ep, req); | |
1100 | } | |
1101 | ||
1102 | fail_tx_reqs: | |
1103 | while (!list_empty(&dev->tx_reqs)) { | |
1104 | req = container_of(dev->tx_reqs.next, struct usb_request, list); | |
1105 | list_del(&req->list); | |
1106 | printer_req_free(dev->in_ep, req); | |
1107 | } | |
1108 | ||
1109 | return ret; | |
1110 | ||
1111 | } | |
1112 | ||
b185f01a AP |
1113 | static int printer_func_set_alt(struct usb_function *f, |
1114 | unsigned intf, unsigned alt) | |
1115 | { | |
1116 | struct printer_dev *dev = func_to_printer(f); | |
1117 | int ret = -ENOTSUPP; | |
1118 | ||
1119 | if (!alt) | |
1120 | ret = set_interface(dev, intf); | |
1121 | ||
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | static void printer_func_disable(struct usb_function *f) | |
1126 | { | |
1127 | struct printer_dev *dev = func_to_printer(f); | |
b185f01a AP |
1128 | |
1129 | DBG(dev, "%s\n", __func__); | |
1130 | ||
b185f01a | 1131 | printer_reset_interface(dev); |
b185f01a AP |
1132 | } |
1133 | ||
ee1cd515 AP |
1134 | static inline struct f_printer_opts |
1135 | *to_f_printer_opts(struct config_item *item) | |
1136 | { | |
1137 | return container_of(to_config_group(item), struct f_printer_opts, | |
1138 | func_inst.group); | |
1139 | } | |
1140 | ||
ee1cd515 AP |
1141 | static void printer_attr_release(struct config_item *item) |
1142 | { | |
1143 | struct f_printer_opts *opts = to_f_printer_opts(item); | |
1144 | ||
1145 | usb_put_function_instance(&opts->func_inst); | |
1146 | } | |
1147 | ||
1148 | static struct configfs_item_operations printer_item_ops = { | |
1149 | .release = printer_attr_release, | |
ee1cd515 AP |
1150 | }; |
1151 | ||
aa48a415 | 1152 | static ssize_t f_printer_opts_pnp_string_show(struct config_item *item, |
ee1cd515 AP |
1153 | char *page) |
1154 | { | |
aa48a415 | 1155 | struct f_printer_opts *opts = to_f_printer_opts(item); |
ee1cd515 AP |
1156 | int result; |
1157 | ||
1158 | mutex_lock(&opts->lock); | |
1159 | result = strlcpy(page, opts->pnp_string + 2, PNP_STRING_LEN - 2); | |
1160 | mutex_unlock(&opts->lock); | |
1161 | ||
1162 | return result; | |
1163 | } | |
1164 | ||
aa48a415 | 1165 | static ssize_t f_printer_opts_pnp_string_store(struct config_item *item, |
ee1cd515 AP |
1166 | const char *page, size_t len) |
1167 | { | |
aa48a415 | 1168 | struct f_printer_opts *opts = to_f_printer_opts(item); |
ee1cd515 AP |
1169 | int result, l; |
1170 | ||
1171 | mutex_lock(&opts->lock); | |
1172 | result = strlcpy(opts->pnp_string + 2, page, PNP_STRING_LEN - 2); | |
1173 | l = strlen(opts->pnp_string + 2) + 2; | |
1174 | opts->pnp_string[0] = (l >> 8) & 0xFF; | |
1175 | opts->pnp_string[1] = l & 0xFF; | |
1176 | mutex_unlock(&opts->lock); | |
1177 | ||
1178 | return result; | |
1179 | } | |
1180 | ||
aa48a415 | 1181 | CONFIGFS_ATTR(f_printer_opts_, pnp_string); |
ee1cd515 | 1182 | |
aa48a415 | 1183 | static ssize_t f_printer_opts_q_len_show(struct config_item *item, |
ee1cd515 AP |
1184 | char *page) |
1185 | { | |
aa48a415 | 1186 | struct f_printer_opts *opts = to_f_printer_opts(item); |
ee1cd515 AP |
1187 | int result; |
1188 | ||
1189 | mutex_lock(&opts->lock); | |
1190 | result = sprintf(page, "%d\n", opts->q_len); | |
1191 | mutex_unlock(&opts->lock); | |
1192 | ||
1193 | return result; | |
1194 | } | |
1195 | ||
aa48a415 | 1196 | static ssize_t f_printer_opts_q_len_store(struct config_item *item, |
ee1cd515 AP |
1197 | const char *page, size_t len) |
1198 | { | |
aa48a415 | 1199 | struct f_printer_opts *opts = to_f_printer_opts(item); |
ee1cd515 AP |
1200 | int ret; |
1201 | u16 num; | |
1202 | ||
1203 | mutex_lock(&opts->lock); | |
1204 | if (opts->refcnt) { | |
1205 | ret = -EBUSY; | |
1206 | goto end; | |
1207 | } | |
1208 | ||
1209 | ret = kstrtou16(page, 0, &num); | |
1210 | if (ret) | |
1211 | goto end; | |
1212 | ||
ee1cd515 AP |
1213 | opts->q_len = (unsigned)num; |
1214 | ret = len; | |
1215 | end: | |
1216 | mutex_unlock(&opts->lock); | |
1217 | return ret; | |
1218 | } | |
1219 | ||
aa48a415 | 1220 | CONFIGFS_ATTR(f_printer_opts_, q_len); |
ee1cd515 AP |
1221 | |
1222 | static struct configfs_attribute *printer_attrs[] = { | |
aa48a415 CH |
1223 | &f_printer_opts_attr_pnp_string, |
1224 | &f_printer_opts_attr_q_len, | |
ee1cd515 AP |
1225 | NULL, |
1226 | }; | |
1227 | ||
1228 | static struct config_item_type printer_func_type = { | |
1229 | .ct_item_ops = &printer_item_ops, | |
1230 | .ct_attrs = printer_attrs, | |
1231 | .ct_owner = THIS_MODULE, | |
1232 | }; | |
1233 | ||
b26394bd AP |
1234 | static inline int gprinter_get_minor(void) |
1235 | { | |
4248bd7d AP |
1236 | int ret; |
1237 | ||
1238 | ret = ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL); | |
1239 | if (ret >= PRINTER_MINORS) { | |
1240 | ida_simple_remove(&printer_ida, ret); | |
1241 | ret = -ENODEV; | |
1242 | } | |
1243 | ||
1244 | return ret; | |
b26394bd AP |
1245 | } |
1246 | ||
1247 | static inline void gprinter_put_minor(int minor) | |
1248 | { | |
1249 | ida_simple_remove(&printer_ida, minor); | |
1250 | } | |
1251 | ||
1252 | static int gprinter_setup(int); | |
1253 | static void gprinter_cleanup(void); | |
1254 | ||
1255 | static void gprinter_free_inst(struct usb_function_instance *f) | |
1256 | { | |
1257 | struct f_printer_opts *opts; | |
1258 | ||
1259 | opts = container_of(f, struct f_printer_opts, func_inst); | |
1260 | ||
1261 | mutex_lock(&printer_ida_lock); | |
1262 | ||
1263 | gprinter_put_minor(opts->minor); | |
1264 | if (idr_is_empty(&printer_ida.idr)) | |
1265 | gprinter_cleanup(); | |
1266 | ||
1267 | mutex_unlock(&printer_ida_lock); | |
1268 | ||
1269 | kfree(opts); | |
1270 | } | |
1271 | ||
1272 | static struct usb_function_instance *gprinter_alloc_inst(void) | |
1273 | { | |
1274 | struct f_printer_opts *opts; | |
1275 | struct usb_function_instance *ret; | |
1276 | int status = 0; | |
1277 | ||
1278 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
1279 | if (!opts) | |
1280 | return ERR_PTR(-ENOMEM); | |
1281 | ||
ee1cd515 | 1282 | mutex_init(&opts->lock); |
b26394bd AP |
1283 | opts->func_inst.free_func_inst = gprinter_free_inst; |
1284 | ret = &opts->func_inst; | |
1285 | ||
1286 | mutex_lock(&printer_ida_lock); | |
1287 | ||
1288 | if (idr_is_empty(&printer_ida.idr)) { | |
1289 | status = gprinter_setup(PRINTER_MINORS); | |
1290 | if (status) { | |
1291 | ret = ERR_PTR(status); | |
1292 | kfree(opts); | |
1293 | goto unlock; | |
1294 | } | |
1295 | } | |
1296 | ||
1297 | opts->minor = gprinter_get_minor(); | |
1298 | if (opts->minor < 0) { | |
1299 | ret = ERR_PTR(opts->minor); | |
1300 | kfree(opts); | |
1301 | if (idr_is_empty(&printer_ida.idr)) | |
1302 | gprinter_cleanup(); | |
2bb2077e | 1303 | goto unlock; |
b26394bd | 1304 | } |
ee1cd515 AP |
1305 | config_group_init_type_name(&opts->func_inst.group, "", |
1306 | &printer_func_type); | |
b26394bd AP |
1307 | |
1308 | unlock: | |
1309 | mutex_unlock(&printer_ida_lock); | |
1310 | return ret; | |
1311 | } | |
1312 | ||
1313 | static void gprinter_free(struct usb_function *f) | |
1314 | { | |
1315 | struct printer_dev *dev = func_to_printer(f); | |
ee1cd515 | 1316 | struct f_printer_opts *opts; |
b26394bd | 1317 | |
ee1cd515 | 1318 | opts = container_of(f->fi, struct f_printer_opts, func_inst); |
b26394bd | 1319 | kfree(dev); |
ee1cd515 AP |
1320 | mutex_lock(&opts->lock); |
1321 | --opts->refcnt; | |
1322 | mutex_unlock(&opts->lock); | |
b26394bd AP |
1323 | } |
1324 | ||
1325 | static void printer_func_unbind(struct usb_configuration *c, | |
1326 | struct usb_function *f) | |
1327 | { | |
1328 | struct printer_dev *dev; | |
1329 | struct usb_request *req; | |
1330 | ||
1331 | dev = func_to_printer(f); | |
1332 | ||
1333 | device_destroy(usb_gadget_class, MKDEV(major, dev->minor)); | |
1334 | ||
1335 | /* Remove Character Device */ | |
1336 | cdev_del(&dev->printer_cdev); | |
1337 | ||
1338 | /* we must already have been disconnected ... no i/o may be active */ | |
1339 | WARN_ON(!list_empty(&dev->tx_reqs_active)); | |
1340 | WARN_ON(!list_empty(&dev->rx_reqs_active)); | |
1341 | ||
1342 | /* Free all memory for this driver. */ | |
1343 | while (!list_empty(&dev->tx_reqs)) { | |
1344 | req = container_of(dev->tx_reqs.next, struct usb_request, | |
1345 | list); | |
1346 | list_del(&req->list); | |
1347 | printer_req_free(dev->in_ep, req); | |
1348 | } | |
1349 | ||
1350 | if (dev->current_rx_req != NULL) | |
1351 | printer_req_free(dev->out_ep, dev->current_rx_req); | |
1352 | ||
1353 | while (!list_empty(&dev->rx_reqs)) { | |
1354 | req = container_of(dev->rx_reqs.next, | |
1355 | struct usb_request, list); | |
1356 | list_del(&req->list); | |
1357 | printer_req_free(dev->out_ep, req); | |
1358 | } | |
1359 | ||
1360 | while (!list_empty(&dev->rx_buffers)) { | |
1361 | req = container_of(dev->rx_buffers.next, | |
1362 | struct usb_request, list); | |
1363 | list_del(&req->list); | |
1364 | printer_req_free(dev->out_ep, req); | |
1365 | } | |
1366 | usb_free_all_descriptors(f); | |
1367 | } | |
1368 | ||
1369 | static struct usb_function *gprinter_alloc(struct usb_function_instance *fi) | |
1370 | { | |
1371 | struct printer_dev *dev; | |
1372 | struct f_printer_opts *opts; | |
1373 | ||
1374 | opts = container_of(fi, struct f_printer_opts, func_inst); | |
1375 | ||
ee1cd515 AP |
1376 | mutex_lock(&opts->lock); |
1377 | if (opts->minor >= minors) { | |
1378 | mutex_unlock(&opts->lock); | |
b26394bd | 1379 | return ERR_PTR(-ENOENT); |
ee1cd515 | 1380 | } |
b26394bd AP |
1381 | |
1382 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
ee1cd515 AP |
1383 | if (!dev) { |
1384 | mutex_unlock(&opts->lock); | |
b26394bd | 1385 | return ERR_PTR(-ENOMEM); |
ee1cd515 | 1386 | } |
b26394bd | 1387 | |
ee1cd515 | 1388 | ++opts->refcnt; |
b26394bd AP |
1389 | dev->minor = opts->minor; |
1390 | dev->pnp_string = opts->pnp_string; | |
1391 | dev->q_len = opts->q_len; | |
ee1cd515 | 1392 | mutex_unlock(&opts->lock); |
b26394bd AP |
1393 | |
1394 | dev->function.name = "printer"; | |
1395 | dev->function.bind = printer_func_bind; | |
1396 | dev->function.setup = printer_func_setup; | |
1397 | dev->function.unbind = printer_func_unbind; | |
1398 | dev->function.set_alt = printer_func_set_alt; | |
1399 | dev->function.disable = printer_func_disable; | |
1400 | dev->function.req_match = gprinter_req_match; | |
1401 | dev->function.free_func = gprinter_free; | |
1402 | ||
1403 | INIT_LIST_HEAD(&dev->tx_reqs); | |
1404 | INIT_LIST_HEAD(&dev->rx_reqs); | |
1405 | INIT_LIST_HEAD(&dev->rx_buffers); | |
1406 | INIT_LIST_HEAD(&dev->tx_reqs_active); | |
1407 | INIT_LIST_HEAD(&dev->rx_reqs_active); | |
1408 | ||
1409 | spin_lock_init(&dev->lock); | |
1410 | mutex_init(&dev->lock_printer_io); | |
1411 | init_waitqueue_head(&dev->rx_wait); | |
1412 | init_waitqueue_head(&dev->tx_wait); | |
1413 | init_waitqueue_head(&dev->tx_flush_wait); | |
1414 | ||
1415 | dev->interface = -1; | |
1416 | dev->printer_cdev_open = 0; | |
1417 | dev->printer_status = PRINTER_NOT_ERROR; | |
1418 | dev->current_rx_req = NULL; | |
1419 | dev->current_rx_bytes = 0; | |
1420 | dev->current_rx_buf = NULL; | |
1421 | ||
1422 | return &dev->function; | |
1423 | } | |
1424 | ||
1425 | DECLARE_USB_FUNCTION_INIT(printer, gprinter_alloc_inst, gprinter_alloc); | |
1426 | MODULE_LICENSE("GPL"); | |
1427 | MODULE_AUTHOR("Craig Nadler"); | |
1428 | ||
b185f01a AP |
1429 | static int gprinter_setup(int count) |
1430 | { | |
1431 | int status; | |
1432 | dev_t devt; | |
1433 | ||
1434 | usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget"); | |
1435 | if (IS_ERR(usb_gadget_class)) { | |
1436 | status = PTR_ERR(usb_gadget_class); | |
1437 | usb_gadget_class = NULL; | |
1438 | pr_err("unable to create usb_gadget class %d\n", status); | |
1439 | return status; | |
1440 | } | |
1441 | ||
1442 | status = alloc_chrdev_region(&devt, 0, count, "USB printer gadget"); | |
1443 | if (status) { | |
1444 | pr_err("alloc_chrdev_region %d\n", status); | |
1445 | class_destroy(usb_gadget_class); | |
1446 | usb_gadget_class = NULL; | |
1447 | return status; | |
1448 | } | |
1449 | ||
1450 | major = MAJOR(devt); | |
1451 | minors = count; | |
1452 | ||
1453 | return status; | |
1454 | } | |
1455 | ||
1456 | static void gprinter_cleanup(void) | |
1457 | { | |
1458 | if (major) { | |
1459 | unregister_chrdev_region(MKDEV(major, 0), minors); | |
1460 | major = minors = 0; | |
1461 | } | |
1462 | class_destroy(usb_gadget_class); | |
1463 | usb_gadget_class = NULL; | |
1464 | } |