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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 | ||
164 | static struct usb_qualifier_descriptor dev_qualifier = { | |
165 | .bLength = sizeof(dev_qualifier), | |
166 | .bDescriptorType = USB_DT_DEVICE_QUALIFIER, | |
167 | .bcdUSB = cpu_to_le16(0x0200), | |
168 | .bDeviceClass = USB_CLASS_PRINTER, | |
169 | .bNumConfigurations = 1 | |
170 | }; | |
171 | ||
172 | static struct usb_descriptor_header *hs_printer_function[] = { | |
173 | (struct usb_descriptor_header *) &intf_desc, | |
174 | (struct usb_descriptor_header *) &hs_ep_in_desc, | |
175 | (struct usb_descriptor_header *) &hs_ep_out_desc, | |
176 | NULL | |
177 | }; | |
178 | ||
179 | /* | |
180 | * Added endpoint descriptors for 3.0 devices | |
181 | */ | |
182 | ||
183 | static struct usb_endpoint_descriptor ss_ep_in_desc = { | |
184 | .bLength = USB_DT_ENDPOINT_SIZE, | |
185 | .bDescriptorType = USB_DT_ENDPOINT, | |
186 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
187 | .wMaxPacketSize = cpu_to_le16(1024), | |
188 | }; | |
189 | ||
190 | static struct usb_ss_ep_comp_descriptor ss_ep_in_comp_desc = { | |
191 | .bLength = sizeof(ss_ep_in_comp_desc), | |
192 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
193 | }; | |
194 | ||
195 | static struct usb_endpoint_descriptor ss_ep_out_desc = { | |
196 | .bLength = USB_DT_ENDPOINT_SIZE, | |
197 | .bDescriptorType = USB_DT_ENDPOINT, | |
198 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
199 | .wMaxPacketSize = cpu_to_le16(1024), | |
200 | }; | |
201 | ||
202 | static struct usb_ss_ep_comp_descriptor ss_ep_out_comp_desc = { | |
203 | .bLength = sizeof(ss_ep_out_comp_desc), | |
204 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
205 | }; | |
206 | ||
207 | static struct usb_descriptor_header *ss_printer_function[] = { | |
208 | (struct usb_descriptor_header *) &intf_desc, | |
209 | (struct usb_descriptor_header *) &ss_ep_in_desc, | |
210 | (struct usb_descriptor_header *) &ss_ep_in_comp_desc, | |
211 | (struct usb_descriptor_header *) &ss_ep_out_desc, | |
212 | (struct usb_descriptor_header *) &ss_ep_out_comp_desc, | |
213 | NULL | |
214 | }; | |
215 | ||
216 | /* maxpacket and other transfer characteristics vary by speed. */ | |
217 | static inline struct usb_endpoint_descriptor *ep_desc(struct usb_gadget *gadget, | |
218 | struct usb_endpoint_descriptor *fs, | |
219 | struct usb_endpoint_descriptor *hs, | |
220 | struct usb_endpoint_descriptor *ss) | |
221 | { | |
222 | switch (gadget->speed) { | |
223 | case USB_SPEED_SUPER: | |
224 | return ss; | |
225 | case USB_SPEED_HIGH: | |
226 | return hs; | |
227 | default: | |
228 | return fs; | |
229 | } | |
230 | } | |
231 | ||
232 | /*-------------------------------------------------------------------------*/ | |
233 | ||
234 | static struct usb_request * | |
235 | printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags) | |
236 | { | |
237 | struct usb_request *req; | |
238 | ||
239 | req = usb_ep_alloc_request(ep, gfp_flags); | |
240 | ||
241 | if (req != NULL) { | |
242 | req->length = len; | |
243 | req->buf = kmalloc(len, gfp_flags); | |
244 | if (req->buf == NULL) { | |
245 | usb_ep_free_request(ep, req); | |
246 | return NULL; | |
247 | } | |
248 | } | |
249 | ||
250 | return req; | |
251 | } | |
252 | ||
253 | static void | |
254 | printer_req_free(struct usb_ep *ep, struct usb_request *req) | |
255 | { | |
256 | if (ep != NULL && req != NULL) { | |
257 | kfree(req->buf); | |
258 | usb_ep_free_request(ep, req); | |
259 | } | |
260 | } | |
261 | ||
262 | /*-------------------------------------------------------------------------*/ | |
263 | ||
264 | static void rx_complete(struct usb_ep *ep, struct usb_request *req) | |
265 | { | |
266 | struct printer_dev *dev = ep->driver_data; | |
267 | int status = req->status; | |
268 | unsigned long flags; | |
269 | ||
270 | spin_lock_irqsave(&dev->lock, flags); | |
271 | ||
272 | list_del_init(&req->list); /* Remode from Active List */ | |
273 | ||
274 | switch (status) { | |
275 | ||
276 | /* normal completion */ | |
277 | case 0: | |
278 | if (req->actual > 0) { | |
279 | list_add_tail(&req->list, &dev->rx_buffers); | |
280 | DBG(dev, "G_Printer : rx length %d\n", req->actual); | |
281 | } else { | |
282 | list_add(&req->list, &dev->rx_reqs); | |
283 | } | |
284 | break; | |
285 | ||
286 | /* software-driven interface shutdown */ | |
287 | case -ECONNRESET: /* unlink */ | |
288 | case -ESHUTDOWN: /* disconnect etc */ | |
289 | VDBG(dev, "rx shutdown, code %d\n", status); | |
290 | list_add(&req->list, &dev->rx_reqs); | |
291 | break; | |
292 | ||
293 | /* for hardware automagic (such as pxa) */ | |
294 | case -ECONNABORTED: /* endpoint reset */ | |
295 | DBG(dev, "rx %s reset\n", ep->name); | |
296 | list_add(&req->list, &dev->rx_reqs); | |
297 | break; | |
298 | ||
299 | /* data overrun */ | |
300 | case -EOVERFLOW: | |
301 | /* FALLTHROUGH */ | |
302 | ||
303 | default: | |
304 | DBG(dev, "rx status %d\n", status); | |
305 | list_add(&req->list, &dev->rx_reqs); | |
306 | break; | |
307 | } | |
308 | ||
309 | wake_up_interruptible(&dev->rx_wait); | |
310 | spin_unlock_irqrestore(&dev->lock, flags); | |
311 | } | |
312 | ||
313 | static void tx_complete(struct usb_ep *ep, struct usb_request *req) | |
314 | { | |
315 | struct printer_dev *dev = ep->driver_data; | |
316 | ||
317 | switch (req->status) { | |
318 | default: | |
319 | VDBG(dev, "tx err %d\n", req->status); | |
320 | /* FALLTHROUGH */ | |
321 | case -ECONNRESET: /* unlink */ | |
322 | case -ESHUTDOWN: /* disconnect etc */ | |
323 | break; | |
324 | case 0: | |
325 | break; | |
326 | } | |
327 | ||
328 | spin_lock(&dev->lock); | |
329 | /* Take the request struct off the active list and put it on the | |
330 | * free list. | |
331 | */ | |
332 | list_del_init(&req->list); | |
333 | list_add(&req->list, &dev->tx_reqs); | |
334 | wake_up_interruptible(&dev->tx_wait); | |
335 | if (likely(list_empty(&dev->tx_reqs_active))) | |
336 | wake_up_interruptible(&dev->tx_flush_wait); | |
337 | ||
338 | spin_unlock(&dev->lock); | |
339 | } | |
340 | ||
341 | /*-------------------------------------------------------------------------*/ | |
342 | ||
343 | static int | |
344 | printer_open(struct inode *inode, struct file *fd) | |
345 | { | |
346 | struct printer_dev *dev; | |
347 | unsigned long flags; | |
348 | int ret = -EBUSY; | |
349 | ||
350 | dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev); | |
351 | ||
352 | spin_lock_irqsave(&dev->lock, flags); | |
353 | ||
354 | if (!dev->printer_cdev_open) { | |
355 | dev->printer_cdev_open = 1; | |
356 | fd->private_data = dev; | |
357 | ret = 0; | |
358 | /* Change the printer status to show that it's on-line. */ | |
359 | dev->printer_status |= PRINTER_SELECTED; | |
360 | } | |
361 | ||
362 | spin_unlock_irqrestore(&dev->lock, flags); | |
363 | ||
364 | DBG(dev, "printer_open returned %x\n", ret); | |
365 | return ret; | |
366 | } | |
367 | ||
368 | static int | |
369 | printer_close(struct inode *inode, struct file *fd) | |
370 | { | |
371 | struct printer_dev *dev = fd->private_data; | |
372 | unsigned long flags; | |
373 | ||
374 | spin_lock_irqsave(&dev->lock, flags); | |
375 | dev->printer_cdev_open = 0; | |
376 | fd->private_data = NULL; | |
377 | /* Change printer status to show that the printer is off-line. */ | |
378 | dev->printer_status &= ~PRINTER_SELECTED; | |
379 | spin_unlock_irqrestore(&dev->lock, flags); | |
380 | ||
381 | DBG(dev, "printer_close\n"); | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | /* This function must be called with interrupts turned off. */ | |
387 | static void | |
388 | setup_rx_reqs(struct printer_dev *dev) | |
389 | { | |
390 | struct usb_request *req; | |
391 | ||
392 | while (likely(!list_empty(&dev->rx_reqs))) { | |
393 | int error; | |
394 | ||
395 | req = container_of(dev->rx_reqs.next, | |
396 | struct usb_request, list); | |
397 | list_del_init(&req->list); | |
398 | ||
399 | /* The USB Host sends us whatever amount of data it wants to | |
400 | * so we always set the length field to the full USB_BUFSIZE. | |
401 | * If the amount of data is more than the read() caller asked | |
402 | * for it will be stored in the request buffer until it is | |
403 | * asked for by read(). | |
404 | */ | |
405 | req->length = USB_BUFSIZE; | |
406 | req->complete = rx_complete; | |
407 | ||
408 | /* here, we unlock, and only unlock, to avoid deadlock. */ | |
409 | spin_unlock(&dev->lock); | |
410 | error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC); | |
411 | spin_lock(&dev->lock); | |
412 | if (error) { | |
413 | DBG(dev, "rx submit --> %d\n", error); | |
414 | list_add(&req->list, &dev->rx_reqs); | |
415 | break; | |
416 | } | |
417 | /* if the req is empty, then add it into dev->rx_reqs_active. */ | |
418 | else if (list_empty(&req->list)) | |
419 | list_add(&req->list, &dev->rx_reqs_active); | |
420 | } | |
421 | } | |
422 | ||
423 | static ssize_t | |
424 | printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr) | |
425 | { | |
426 | struct printer_dev *dev = fd->private_data; | |
427 | unsigned long flags; | |
428 | size_t size; | |
429 | size_t bytes_copied; | |
430 | struct usb_request *req; | |
431 | /* This is a pointer to the current USB rx request. */ | |
432 | struct usb_request *current_rx_req; | |
433 | /* This is the number of bytes in the current rx buffer. */ | |
434 | size_t current_rx_bytes; | |
435 | /* This is a pointer to the current rx buffer. */ | |
436 | u8 *current_rx_buf; | |
437 | ||
438 | if (len == 0) | |
439 | return -EINVAL; | |
440 | ||
441 | DBG(dev, "printer_read trying to read %d bytes\n", (int)len); | |
442 | ||
443 | mutex_lock(&dev->lock_printer_io); | |
444 | spin_lock_irqsave(&dev->lock, flags); | |
445 | ||
446 | /* We will use this flag later to check if a printer reset happened | |
447 | * after we turn interrupts back on. | |
448 | */ | |
449 | dev->reset_printer = 0; | |
450 | ||
451 | setup_rx_reqs(dev); | |
452 | ||
453 | bytes_copied = 0; | |
454 | current_rx_req = dev->current_rx_req; | |
455 | current_rx_bytes = dev->current_rx_bytes; | |
456 | current_rx_buf = dev->current_rx_buf; | |
457 | dev->current_rx_req = NULL; | |
458 | dev->current_rx_bytes = 0; | |
459 | dev->current_rx_buf = NULL; | |
460 | ||
461 | /* Check if there is any data in the read buffers. Please note that | |
462 | * current_rx_bytes is the number of bytes in the current rx buffer. | |
463 | * If it is zero then check if there are any other rx_buffers that | |
464 | * are on the completed list. We are only out of data if all rx | |
465 | * buffers are empty. | |
466 | */ | |
467 | if ((current_rx_bytes == 0) && | |
468 | (likely(list_empty(&dev->rx_buffers)))) { | |
469 | /* Turn interrupts back on before sleeping. */ | |
470 | spin_unlock_irqrestore(&dev->lock, flags); | |
471 | ||
472 | /* | |
473 | * If no data is available check if this is a NON-Blocking | |
474 | * call or not. | |
475 | */ | |
476 | if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { | |
477 | mutex_unlock(&dev->lock_printer_io); | |
478 | return -EAGAIN; | |
479 | } | |
480 | ||
481 | /* Sleep until data is available */ | |
482 | wait_event_interruptible(dev->rx_wait, | |
483 | (likely(!list_empty(&dev->rx_buffers)))); | |
484 | spin_lock_irqsave(&dev->lock, flags); | |
485 | } | |
486 | ||
487 | /* We have data to return then copy it to the caller's buffer.*/ | |
488 | while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers))) | |
489 | && len) { | |
490 | if (current_rx_bytes == 0) { | |
491 | req = container_of(dev->rx_buffers.next, | |
492 | struct usb_request, list); | |
493 | list_del_init(&req->list); | |
494 | ||
495 | if (req->actual && req->buf) { | |
496 | current_rx_req = req; | |
497 | current_rx_bytes = req->actual; | |
498 | current_rx_buf = req->buf; | |
499 | } else { | |
500 | list_add(&req->list, &dev->rx_reqs); | |
501 | continue; | |
502 | } | |
503 | } | |
504 | ||
505 | /* Don't leave irqs off while doing memory copies */ | |
506 | spin_unlock_irqrestore(&dev->lock, flags); | |
507 | ||
508 | if (len > current_rx_bytes) | |
509 | size = current_rx_bytes; | |
510 | else | |
511 | size = len; | |
512 | ||
513 | size -= copy_to_user(buf, current_rx_buf, size); | |
514 | bytes_copied += size; | |
515 | len -= size; | |
516 | buf += size; | |
517 | ||
518 | spin_lock_irqsave(&dev->lock, flags); | |
519 | ||
520 | /* We've disconnected or reset so return. */ | |
521 | if (dev->reset_printer) { | |
522 | list_add(¤t_rx_req->list, &dev->rx_reqs); | |
523 | spin_unlock_irqrestore(&dev->lock, flags); | |
524 | mutex_unlock(&dev->lock_printer_io); | |
525 | return -EAGAIN; | |
526 | } | |
527 | ||
528 | /* If we not returning all the data left in this RX request | |
529 | * buffer then adjust the amount of data left in the buffer. | |
530 | * Othewise if we are done with this RX request buffer then | |
531 | * requeue it to get any incoming data from the USB host. | |
532 | */ | |
533 | if (size < current_rx_bytes) { | |
534 | current_rx_bytes -= size; | |
535 | current_rx_buf += size; | |
536 | } else { | |
537 | list_add(¤t_rx_req->list, &dev->rx_reqs); | |
538 | current_rx_bytes = 0; | |
539 | current_rx_buf = NULL; | |
540 | current_rx_req = NULL; | |
541 | } | |
542 | } | |
543 | ||
544 | dev->current_rx_req = current_rx_req; | |
545 | dev->current_rx_bytes = current_rx_bytes; | |
546 | dev->current_rx_buf = current_rx_buf; | |
547 | ||
548 | spin_unlock_irqrestore(&dev->lock, flags); | |
549 | mutex_unlock(&dev->lock_printer_io); | |
550 | ||
551 | DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied); | |
552 | ||
553 | if (bytes_copied) | |
554 | return bytes_copied; | |
555 | else | |
556 | return -EAGAIN; | |
557 | } | |
558 | ||
559 | static ssize_t | |
560 | printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr) | |
561 | { | |
562 | struct printer_dev *dev = fd->private_data; | |
563 | unsigned long flags; | |
564 | size_t size; /* Amount of data in a TX request. */ | |
565 | size_t bytes_copied = 0; | |
566 | struct usb_request *req; | |
567 | ||
568 | DBG(dev, "printer_write trying to send %d bytes\n", (int)len); | |
569 | ||
570 | if (len == 0) | |
571 | return -EINVAL; | |
572 | ||
573 | mutex_lock(&dev->lock_printer_io); | |
574 | spin_lock_irqsave(&dev->lock, flags); | |
575 | ||
576 | /* Check if a printer reset happens while we have interrupts on */ | |
577 | dev->reset_printer = 0; | |
578 | ||
579 | /* Check if there is any available write buffers */ | |
580 | if (likely(list_empty(&dev->tx_reqs))) { | |
581 | /* Turn interrupts back on before sleeping. */ | |
582 | spin_unlock_irqrestore(&dev->lock, flags); | |
583 | ||
584 | /* | |
585 | * If write buffers are available check if this is | |
586 | * a NON-Blocking call or not. | |
587 | */ | |
588 | if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { | |
589 | mutex_unlock(&dev->lock_printer_io); | |
590 | return -EAGAIN; | |
591 | } | |
592 | ||
593 | /* Sleep until a write buffer is available */ | |
594 | wait_event_interruptible(dev->tx_wait, | |
595 | (likely(!list_empty(&dev->tx_reqs)))); | |
596 | spin_lock_irqsave(&dev->lock, flags); | |
597 | } | |
598 | ||
599 | while (likely(!list_empty(&dev->tx_reqs)) && len) { | |
600 | ||
601 | if (len > USB_BUFSIZE) | |
602 | size = USB_BUFSIZE; | |
603 | else | |
604 | size = len; | |
605 | ||
606 | req = container_of(dev->tx_reqs.next, struct usb_request, | |
607 | list); | |
608 | list_del_init(&req->list); | |
609 | ||
610 | req->complete = tx_complete; | |
611 | req->length = size; | |
612 | ||
613 | /* Check if we need to send a zero length packet. */ | |
614 | if (len > size) | |
615 | /* They will be more TX requests so no yet. */ | |
616 | req->zero = 0; | |
617 | else | |
618 | /* If the data amount is not a multiple of the | |
619 | * maxpacket size then send a zero length packet. | |
620 | */ | |
621 | req->zero = ((len % dev->in_ep->maxpacket) == 0); | |
622 | ||
623 | /* Don't leave irqs off while doing memory copies */ | |
624 | spin_unlock_irqrestore(&dev->lock, flags); | |
625 | ||
626 | if (copy_from_user(req->buf, buf, size)) { | |
627 | list_add(&req->list, &dev->tx_reqs); | |
628 | mutex_unlock(&dev->lock_printer_io); | |
629 | return bytes_copied; | |
630 | } | |
631 | ||
632 | bytes_copied += size; | |
633 | len -= size; | |
634 | buf += size; | |
635 | ||
636 | spin_lock_irqsave(&dev->lock, flags); | |
637 | ||
638 | /* We've disconnected or reset so free the req and buffer */ | |
639 | if (dev->reset_printer) { | |
640 | list_add(&req->list, &dev->tx_reqs); | |
641 | spin_unlock_irqrestore(&dev->lock, flags); | |
642 | mutex_unlock(&dev->lock_printer_io); | |
643 | return -EAGAIN; | |
644 | } | |
645 | ||
646 | if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) { | |
647 | list_add(&req->list, &dev->tx_reqs); | |
648 | spin_unlock_irqrestore(&dev->lock, flags); | |
649 | mutex_unlock(&dev->lock_printer_io); | |
650 | return -EAGAIN; | |
651 | } | |
652 | ||
653 | list_add(&req->list, &dev->tx_reqs_active); | |
654 | ||
655 | } | |
656 | ||
657 | spin_unlock_irqrestore(&dev->lock, flags); | |
658 | mutex_unlock(&dev->lock_printer_io); | |
659 | ||
660 | DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied); | |
661 | ||
662 | if (bytes_copied) | |
663 | return bytes_copied; | |
664 | else | |
665 | return -EAGAIN; | |
666 | } | |
667 | ||
668 | static int | |
669 | printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync) | |
670 | { | |
671 | struct printer_dev *dev = fd->private_data; | |
672 | struct inode *inode = file_inode(fd); | |
673 | unsigned long flags; | |
674 | int tx_list_empty; | |
675 | ||
676 | mutex_lock(&inode->i_mutex); | |
677 | spin_lock_irqsave(&dev->lock, flags); | |
678 | tx_list_empty = (likely(list_empty(&dev->tx_reqs))); | |
679 | spin_unlock_irqrestore(&dev->lock, flags); | |
680 | ||
681 | if (!tx_list_empty) { | |
682 | /* Sleep until all data has been sent */ | |
683 | wait_event_interruptible(dev->tx_flush_wait, | |
684 | (likely(list_empty(&dev->tx_reqs_active)))); | |
685 | } | |
686 | mutex_unlock(&inode->i_mutex); | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
691 | static unsigned int | |
692 | printer_poll(struct file *fd, poll_table *wait) | |
693 | { | |
694 | struct printer_dev *dev = fd->private_data; | |
695 | unsigned long flags; | |
696 | int status = 0; | |
697 | ||
698 | mutex_lock(&dev->lock_printer_io); | |
699 | spin_lock_irqsave(&dev->lock, flags); | |
700 | setup_rx_reqs(dev); | |
701 | spin_unlock_irqrestore(&dev->lock, flags); | |
702 | mutex_unlock(&dev->lock_printer_io); | |
703 | ||
704 | poll_wait(fd, &dev->rx_wait, wait); | |
705 | poll_wait(fd, &dev->tx_wait, wait); | |
706 | ||
707 | spin_lock_irqsave(&dev->lock, flags); | |
708 | if (likely(!list_empty(&dev->tx_reqs))) | |
709 | status |= POLLOUT | POLLWRNORM; | |
710 | ||
711 | if (likely(dev->current_rx_bytes) || | |
712 | likely(!list_empty(&dev->rx_buffers))) | |
713 | status |= POLLIN | POLLRDNORM; | |
714 | ||
715 | spin_unlock_irqrestore(&dev->lock, flags); | |
716 | ||
717 | return status; | |
718 | } | |
719 | ||
720 | static long | |
721 | printer_ioctl(struct file *fd, unsigned int code, unsigned long arg) | |
722 | { | |
723 | struct printer_dev *dev = fd->private_data; | |
724 | unsigned long flags; | |
725 | int status = 0; | |
726 | ||
727 | DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg); | |
728 | ||
729 | /* handle ioctls */ | |
730 | ||
731 | spin_lock_irqsave(&dev->lock, flags); | |
732 | ||
733 | switch (code) { | |
734 | case GADGET_GET_PRINTER_STATUS: | |
735 | status = (int)dev->printer_status; | |
736 | break; | |
737 | case GADGET_SET_PRINTER_STATUS: | |
738 | dev->printer_status = (u8)arg; | |
739 | break; | |
740 | default: | |
741 | /* could not handle ioctl */ | |
742 | DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n", | |
743 | code); | |
744 | status = -ENOTTY; | |
745 | } | |
746 | ||
747 | spin_unlock_irqrestore(&dev->lock, flags); | |
748 | ||
749 | return status; | |
750 | } | |
751 | ||
752 | /* used after endpoint configuration */ | |
753 | static const struct file_operations printer_io_operations = { | |
754 | .owner = THIS_MODULE, | |
755 | .open = printer_open, | |
756 | .read = printer_read, | |
757 | .write = printer_write, | |
758 | .fsync = printer_fsync, | |
759 | .poll = printer_poll, | |
760 | .unlocked_ioctl = printer_ioctl, | |
761 | .release = printer_close, | |
762 | .llseek = noop_llseek, | |
763 | }; | |
764 | ||
765 | /*-------------------------------------------------------------------------*/ | |
766 | ||
767 | static int | |
768 | set_printer_interface(struct printer_dev *dev) | |
769 | { | |
770 | int result = 0; | |
771 | ||
772 | dev->in_ep->desc = ep_desc(dev->gadget, &fs_ep_in_desc, &hs_ep_in_desc, | |
773 | &ss_ep_in_desc); | |
774 | dev->in_ep->driver_data = dev; | |
775 | ||
776 | dev->out_ep->desc = ep_desc(dev->gadget, &fs_ep_out_desc, | |
777 | &hs_ep_out_desc, &ss_ep_out_desc); | |
778 | dev->out_ep->driver_data = dev; | |
779 | ||
780 | result = usb_ep_enable(dev->in_ep); | |
781 | if (result != 0) { | |
782 | DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result); | |
783 | goto done; | |
784 | } | |
785 | ||
786 | result = usb_ep_enable(dev->out_ep); | |
787 | if (result != 0) { | |
788 | DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result); | |
789 | goto done; | |
790 | } | |
791 | ||
792 | done: | |
793 | /* on error, disable any endpoints */ | |
794 | if (result != 0) { | |
795 | (void) usb_ep_disable(dev->in_ep); | |
796 | (void) usb_ep_disable(dev->out_ep); | |
797 | dev->in_ep->desc = NULL; | |
798 | dev->out_ep->desc = NULL; | |
799 | } | |
800 | ||
801 | /* caller is responsible for cleanup on error */ | |
802 | return result; | |
803 | } | |
804 | ||
805 | static void printer_reset_interface(struct printer_dev *dev) | |
806 | { | |
807 | if (dev->interface < 0) | |
808 | return; | |
809 | ||
810 | DBG(dev, "%s\n", __func__); | |
811 | ||
812 | if (dev->in_ep->desc) | |
813 | usb_ep_disable(dev->in_ep); | |
814 | ||
815 | if (dev->out_ep->desc) | |
816 | usb_ep_disable(dev->out_ep); | |
817 | ||
818 | dev->in_ep->desc = NULL; | |
819 | dev->out_ep->desc = NULL; | |
820 | dev->interface = -1; | |
821 | } | |
822 | ||
823 | /* Change our operational Interface. */ | |
824 | static int set_interface(struct printer_dev *dev, unsigned number) | |
825 | { | |
826 | int result = 0; | |
827 | ||
828 | /* Free the current interface */ | |
829 | printer_reset_interface(dev); | |
830 | ||
831 | result = set_printer_interface(dev); | |
832 | if (result) | |
833 | printer_reset_interface(dev); | |
834 | else | |
835 | dev->interface = number; | |
836 | ||
837 | if (!result) | |
838 | INFO(dev, "Using interface %x\n", number); | |
839 | ||
840 | return result; | |
841 | } | |
842 | ||
843 | static void printer_soft_reset(struct printer_dev *dev) | |
844 | { | |
845 | struct usb_request *req; | |
846 | ||
847 | INFO(dev, "Received Printer Reset Request\n"); | |
848 | ||
849 | if (usb_ep_disable(dev->in_ep)) | |
850 | DBG(dev, "Failed to disable USB in_ep\n"); | |
851 | if (usb_ep_disable(dev->out_ep)) | |
852 | DBG(dev, "Failed to disable USB out_ep\n"); | |
853 | ||
854 | if (dev->current_rx_req != NULL) { | |
855 | list_add(&dev->current_rx_req->list, &dev->rx_reqs); | |
856 | dev->current_rx_req = NULL; | |
857 | } | |
858 | dev->current_rx_bytes = 0; | |
859 | dev->current_rx_buf = NULL; | |
860 | dev->reset_printer = 1; | |
861 | ||
862 | while (likely(!(list_empty(&dev->rx_buffers)))) { | |
863 | req = container_of(dev->rx_buffers.next, struct usb_request, | |
864 | list); | |
865 | list_del_init(&req->list); | |
866 | list_add(&req->list, &dev->rx_reqs); | |
867 | } | |
868 | ||
869 | while (likely(!(list_empty(&dev->rx_reqs_active)))) { | |
870 | req = container_of(dev->rx_buffers.next, struct usb_request, | |
871 | list); | |
872 | list_del_init(&req->list); | |
873 | list_add(&req->list, &dev->rx_reqs); | |
874 | } | |
875 | ||
876 | while (likely(!(list_empty(&dev->tx_reqs_active)))) { | |
877 | req = container_of(dev->tx_reqs_active.next, | |
878 | struct usb_request, list); | |
879 | list_del_init(&req->list); | |
880 | list_add(&req->list, &dev->tx_reqs); | |
881 | } | |
882 | ||
883 | if (usb_ep_enable(dev->in_ep)) | |
884 | DBG(dev, "Failed to enable USB in_ep\n"); | |
885 | if (usb_ep_enable(dev->out_ep)) | |
886 | DBG(dev, "Failed to enable USB out_ep\n"); | |
887 | ||
888 | wake_up_interruptible(&dev->rx_wait); | |
889 | wake_up_interruptible(&dev->tx_wait); | |
890 | wake_up_interruptible(&dev->tx_flush_wait); | |
891 | } | |
892 | ||
893 | /*-------------------------------------------------------------------------*/ | |
894 | ||
895 | static bool gprinter_req_match(struct usb_function *f, | |
896 | const struct usb_ctrlrequest *ctrl) | |
897 | { | |
898 | struct printer_dev *dev = func_to_printer(f); | |
899 | u16 w_index = le16_to_cpu(ctrl->wIndex); | |
900 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
901 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
902 | ||
903 | if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE || | |
904 | (ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) | |
905 | return false; | |
906 | ||
907 | switch (ctrl->bRequest) { | |
908 | case GET_DEVICE_ID: | |
909 | w_index >>= 8; | |
910 | if (w_length <= PNP_STRING_LEN && | |
911 | (USB_DIR_IN & ctrl->bRequestType)) | |
912 | break; | |
913 | return false; | |
914 | case GET_PORT_STATUS: | |
915 | if (!w_value && w_length == 1 && | |
916 | (USB_DIR_IN & ctrl->bRequestType)) | |
917 | break; | |
918 | return false; | |
919 | case SOFT_RESET: | |
920 | if (!w_value && !w_length && | |
921 | (USB_DIR_OUT & ctrl->bRequestType)) | |
922 | break; | |
923 | /* fall through */ | |
924 | default: | |
925 | return false; | |
926 | } | |
927 | return w_index == dev->interface; | |
928 | } | |
929 | ||
930 | /* | |
931 | * The setup() callback implements all the ep0 functionality that's not | |
932 | * handled lower down. | |
933 | */ | |
934 | static int printer_func_setup(struct usb_function *f, | |
935 | const struct usb_ctrlrequest *ctrl) | |
936 | { | |
937 | struct printer_dev *dev = func_to_printer(f); | |
938 | struct usb_composite_dev *cdev = f->config->cdev; | |
939 | struct usb_request *req = cdev->req; | |
940 | int value = -EOPNOTSUPP; | |
941 | u16 wIndex = le16_to_cpu(ctrl->wIndex); | |
942 | u16 wValue = le16_to_cpu(ctrl->wValue); | |
943 | u16 wLength = le16_to_cpu(ctrl->wLength); | |
944 | ||
945 | DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n", | |
946 | ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength); | |
947 | ||
948 | switch (ctrl->bRequestType&USB_TYPE_MASK) { | |
949 | case USB_TYPE_CLASS: | |
950 | switch (ctrl->bRequest) { | |
951 | case GET_DEVICE_ID: /* Get the IEEE-1284 PNP String */ | |
952 | /* Only one printer interface is supported. */ | |
953 | if ((wIndex>>8) != dev->interface) | |
954 | break; | |
955 | ||
956 | value = (dev->pnp_string[0] << 8) | dev->pnp_string[1]; | |
957 | memcpy(req->buf, dev->pnp_string, value); | |
958 | DBG(dev, "1284 PNP String: %x %s\n", value, | |
959 | &dev->pnp_string[2]); | |
960 | break; | |
961 | ||
962 | case GET_PORT_STATUS: /* Get Port Status */ | |
963 | /* Only one printer interface is supported. */ | |
964 | if (wIndex != dev->interface) | |
965 | break; | |
966 | ||
967 | *(u8 *)req->buf = dev->printer_status; | |
968 | value = min_t(u16, wLength, 1); | |
969 | break; | |
970 | ||
971 | case SOFT_RESET: /* Soft Reset */ | |
972 | /* Only one printer interface is supported. */ | |
973 | if (wIndex != dev->interface) | |
974 | break; | |
975 | ||
976 | printer_soft_reset(dev); | |
977 | ||
978 | value = 0; | |
979 | break; | |
980 | ||
981 | default: | |
982 | goto unknown; | |
983 | } | |
984 | break; | |
985 | ||
986 | default: | |
987 | unknown: | |
988 | VDBG(dev, | |
989 | "unknown ctrl req%02x.%02x v%04x i%04x l%d\n", | |
990 | ctrl->bRequestType, ctrl->bRequest, | |
991 | wValue, wIndex, wLength); | |
992 | break; | |
993 | } | |
994 | /* host either stalls (value < 0) or reports success */ | |
995 | if (value >= 0) { | |
996 | req->length = value; | |
997 | req->zero = value < wLength; | |
998 | value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
999 | if (value < 0) { | |
1000 | ERROR(dev, "%s:%d Error!\n", __func__, __LINE__); | |
1001 | req->status = 0; | |
1002 | } | |
1003 | } | |
1004 | return value; | |
1005 | } | |
1006 | ||
b26394bd | 1007 | static int printer_func_bind(struct usb_configuration *c, |
b185f01a AP |
1008 | struct usb_function *f) |
1009 | { | |
1010 | struct usb_gadget *gadget = c->cdev->gadget; | |
1011 | struct printer_dev *dev = func_to_printer(f); | |
1012 | struct device *pdev; | |
1013 | struct usb_composite_dev *cdev = c->cdev; | |
1014 | struct usb_ep *in_ep; | |
1015 | struct usb_ep *out_ep = NULL; | |
1016 | struct usb_request *req; | |
1017 | dev_t devt; | |
1018 | int id; | |
1019 | int ret; | |
1020 | u32 i; | |
1021 | ||
1022 | id = usb_interface_id(c, f); | |
1023 | if (id < 0) | |
1024 | return id; | |
1025 | intf_desc.bInterfaceNumber = id; | |
1026 | ||
1027 | /* finish hookup to lower layer ... */ | |
1028 | dev->gadget = gadget; | |
1029 | ||
1030 | /* all we really need is bulk IN/OUT */ | |
1031 | in_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_in_desc); | |
1032 | if (!in_ep) { | |
1033 | autoconf_fail: | |
1034 | dev_err(&cdev->gadget->dev, "can't autoconfigure on %s\n", | |
1035 | cdev->gadget->name); | |
1036 | return -ENODEV; | |
1037 | } | |
1038 | in_ep->driver_data = in_ep; /* claim */ | |
1039 | ||
1040 | out_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_out_desc); | |
1041 | if (!out_ep) | |
1042 | goto autoconf_fail; | |
1043 | out_ep->driver_data = out_ep; /* claim */ | |
1044 | ||
1045 | /* assumes that all endpoints are dual-speed */ | |
1046 | hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress; | |
1047 | hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress; | |
1048 | ss_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress; | |
1049 | ss_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress; | |
1050 | ||
1051 | ret = usb_assign_descriptors(f, fs_printer_function, | |
1052 | hs_printer_function, ss_printer_function); | |
1053 | if (ret) | |
1054 | return ret; | |
1055 | ||
1056 | dev->in_ep = in_ep; | |
1057 | dev->out_ep = out_ep; | |
1058 | ||
1059 | ret = -ENOMEM; | |
1060 | for (i = 0; i < dev->q_len; i++) { | |
1061 | req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL); | |
1062 | if (!req) | |
1063 | goto fail_tx_reqs; | |
1064 | list_add(&req->list, &dev->tx_reqs); | |
1065 | } | |
1066 | ||
1067 | for (i = 0; i < dev->q_len; i++) { | |
1068 | req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL); | |
1069 | if (!req) | |
1070 | goto fail_rx_reqs; | |
1071 | list_add(&req->list, &dev->rx_reqs); | |
1072 | } | |
1073 | ||
1074 | /* Setup the sysfs files for the printer gadget. */ | |
1075 | devt = MKDEV(major, dev->minor); | |
1076 | pdev = device_create(usb_gadget_class, NULL, devt, | |
1077 | NULL, "g_printer%d", dev->minor); | |
1078 | if (IS_ERR(pdev)) { | |
1079 | ERROR(dev, "Failed to create device: g_printer\n"); | |
1080 | ret = PTR_ERR(pdev); | |
1081 | goto fail_rx_reqs; | |
1082 | } | |
1083 | ||
1084 | /* | |
1085 | * Register a character device as an interface to a user mode | |
1086 | * program that handles the printer specific functionality. | |
1087 | */ | |
1088 | cdev_init(&dev->printer_cdev, &printer_io_operations); | |
1089 | dev->printer_cdev.owner = THIS_MODULE; | |
1090 | ret = cdev_add(&dev->printer_cdev, devt, 1); | |
1091 | if (ret) { | |
1092 | ERROR(dev, "Failed to open char device\n"); | |
1093 | goto fail_cdev_add; | |
1094 | } | |
1095 | ||
1096 | return 0; | |
1097 | ||
1098 | fail_cdev_add: | |
1099 | device_destroy(usb_gadget_class, devt); | |
1100 | ||
1101 | fail_rx_reqs: | |
1102 | while (!list_empty(&dev->rx_reqs)) { | |
1103 | req = container_of(dev->rx_reqs.next, struct usb_request, list); | |
1104 | list_del(&req->list); | |
1105 | printer_req_free(dev->out_ep, req); | |
1106 | } | |
1107 | ||
1108 | fail_tx_reqs: | |
1109 | while (!list_empty(&dev->tx_reqs)) { | |
1110 | req = container_of(dev->tx_reqs.next, struct usb_request, list); | |
1111 | list_del(&req->list); | |
1112 | printer_req_free(dev->in_ep, req); | |
1113 | } | |
1114 | ||
1115 | return ret; | |
1116 | ||
1117 | } | |
1118 | ||
b185f01a AP |
1119 | static int printer_func_set_alt(struct usb_function *f, |
1120 | unsigned intf, unsigned alt) | |
1121 | { | |
1122 | struct printer_dev *dev = func_to_printer(f); | |
1123 | int ret = -ENOTSUPP; | |
1124 | ||
1125 | if (!alt) | |
1126 | ret = set_interface(dev, intf); | |
1127 | ||
1128 | return ret; | |
1129 | } | |
1130 | ||
1131 | static void printer_func_disable(struct usb_function *f) | |
1132 | { | |
1133 | struct printer_dev *dev = func_to_printer(f); | |
1134 | unsigned long flags; | |
1135 | ||
1136 | DBG(dev, "%s\n", __func__); | |
1137 | ||
1138 | spin_lock_irqsave(&dev->lock, flags); | |
1139 | printer_reset_interface(dev); | |
1140 | spin_unlock_irqrestore(&dev->lock, flags); | |
1141 | } | |
1142 | ||
ee1cd515 AP |
1143 | static inline struct f_printer_opts |
1144 | *to_f_printer_opts(struct config_item *item) | |
1145 | { | |
1146 | return container_of(to_config_group(item), struct f_printer_opts, | |
1147 | func_inst.group); | |
1148 | } | |
1149 | ||
1150 | CONFIGFS_ATTR_STRUCT(f_printer_opts); | |
1151 | CONFIGFS_ATTR_OPS(f_printer_opts); | |
1152 | ||
1153 | static void printer_attr_release(struct config_item *item) | |
1154 | { | |
1155 | struct f_printer_opts *opts = to_f_printer_opts(item); | |
1156 | ||
1157 | usb_put_function_instance(&opts->func_inst); | |
1158 | } | |
1159 | ||
1160 | static struct configfs_item_operations printer_item_ops = { | |
1161 | .release = printer_attr_release, | |
1162 | .show_attribute = f_printer_opts_attr_show, | |
1163 | .store_attribute = f_printer_opts_attr_store, | |
1164 | }; | |
1165 | ||
1166 | static ssize_t f_printer_opts_pnp_string_show(struct f_printer_opts *opts, | |
1167 | char *page) | |
1168 | { | |
1169 | int result; | |
1170 | ||
1171 | mutex_lock(&opts->lock); | |
1172 | result = strlcpy(page, opts->pnp_string + 2, PNP_STRING_LEN - 2); | |
1173 | mutex_unlock(&opts->lock); | |
1174 | ||
1175 | return result; | |
1176 | } | |
1177 | ||
1178 | static ssize_t f_printer_opts_pnp_string_store(struct f_printer_opts *opts, | |
1179 | const char *page, size_t len) | |
1180 | { | |
1181 | int result, l; | |
1182 | ||
1183 | mutex_lock(&opts->lock); | |
1184 | result = strlcpy(opts->pnp_string + 2, page, PNP_STRING_LEN - 2); | |
1185 | l = strlen(opts->pnp_string + 2) + 2; | |
1186 | opts->pnp_string[0] = (l >> 8) & 0xFF; | |
1187 | opts->pnp_string[1] = l & 0xFF; | |
1188 | mutex_unlock(&opts->lock); | |
1189 | ||
1190 | return result; | |
1191 | } | |
1192 | ||
1193 | static struct f_printer_opts_attribute f_printer_opts_pnp_string = | |
1194 | __CONFIGFS_ATTR(pnp_string, S_IRUGO | S_IWUSR, | |
1195 | f_printer_opts_pnp_string_show, | |
1196 | f_printer_opts_pnp_string_store); | |
1197 | ||
1198 | static ssize_t f_printer_opts_q_len_show(struct f_printer_opts *opts, | |
1199 | char *page) | |
1200 | { | |
1201 | int result; | |
1202 | ||
1203 | mutex_lock(&opts->lock); | |
1204 | result = sprintf(page, "%d\n", opts->q_len); | |
1205 | mutex_unlock(&opts->lock); | |
1206 | ||
1207 | return result; | |
1208 | } | |
1209 | ||
1210 | static ssize_t f_printer_opts_q_len_store(struct f_printer_opts *opts, | |
1211 | const char *page, size_t len) | |
1212 | { | |
1213 | int ret; | |
1214 | u16 num; | |
1215 | ||
1216 | mutex_lock(&opts->lock); | |
1217 | if (opts->refcnt) { | |
1218 | ret = -EBUSY; | |
1219 | goto end; | |
1220 | } | |
1221 | ||
1222 | ret = kstrtou16(page, 0, &num); | |
1223 | if (ret) | |
1224 | goto end; | |
1225 | ||
ee1cd515 AP |
1226 | opts->q_len = (unsigned)num; |
1227 | ret = len; | |
1228 | end: | |
1229 | mutex_unlock(&opts->lock); | |
1230 | return ret; | |
1231 | } | |
1232 | ||
1233 | static struct f_printer_opts_attribute f_printer_opts_q_len = | |
1234 | __CONFIGFS_ATTR(q_len, S_IRUGO | S_IWUSR, f_printer_opts_q_len_show, | |
1235 | f_printer_opts_q_len_store); | |
1236 | ||
1237 | static struct configfs_attribute *printer_attrs[] = { | |
1238 | &f_printer_opts_pnp_string.attr, | |
1239 | &f_printer_opts_q_len.attr, | |
1240 | NULL, | |
1241 | }; | |
1242 | ||
1243 | static struct config_item_type printer_func_type = { | |
1244 | .ct_item_ops = &printer_item_ops, | |
1245 | .ct_attrs = printer_attrs, | |
1246 | .ct_owner = THIS_MODULE, | |
1247 | }; | |
1248 | ||
b26394bd AP |
1249 | static inline int gprinter_get_minor(void) |
1250 | { | |
1251 | return ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL); | |
1252 | } | |
1253 | ||
1254 | static inline void gprinter_put_minor(int minor) | |
1255 | { | |
1256 | ida_simple_remove(&printer_ida, minor); | |
1257 | } | |
1258 | ||
1259 | static int gprinter_setup(int); | |
1260 | static void gprinter_cleanup(void); | |
1261 | ||
1262 | static void gprinter_free_inst(struct usb_function_instance *f) | |
1263 | { | |
1264 | struct f_printer_opts *opts; | |
1265 | ||
1266 | opts = container_of(f, struct f_printer_opts, func_inst); | |
1267 | ||
1268 | mutex_lock(&printer_ida_lock); | |
1269 | ||
1270 | gprinter_put_minor(opts->minor); | |
1271 | if (idr_is_empty(&printer_ida.idr)) | |
1272 | gprinter_cleanup(); | |
1273 | ||
1274 | mutex_unlock(&printer_ida_lock); | |
1275 | ||
1276 | kfree(opts); | |
1277 | } | |
1278 | ||
1279 | static struct usb_function_instance *gprinter_alloc_inst(void) | |
1280 | { | |
1281 | struct f_printer_opts *opts; | |
1282 | struct usb_function_instance *ret; | |
1283 | int status = 0; | |
1284 | ||
1285 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
1286 | if (!opts) | |
1287 | return ERR_PTR(-ENOMEM); | |
1288 | ||
ee1cd515 | 1289 | mutex_init(&opts->lock); |
b26394bd AP |
1290 | opts->func_inst.free_func_inst = gprinter_free_inst; |
1291 | ret = &opts->func_inst; | |
1292 | ||
1293 | mutex_lock(&printer_ida_lock); | |
1294 | ||
1295 | if (idr_is_empty(&printer_ida.idr)) { | |
1296 | status = gprinter_setup(PRINTER_MINORS); | |
1297 | if (status) { | |
1298 | ret = ERR_PTR(status); | |
1299 | kfree(opts); | |
1300 | goto unlock; | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | opts->minor = gprinter_get_minor(); | |
1305 | if (opts->minor < 0) { | |
1306 | ret = ERR_PTR(opts->minor); | |
1307 | kfree(opts); | |
1308 | if (idr_is_empty(&printer_ida.idr)) | |
1309 | gprinter_cleanup(); | |
2bb2077e | 1310 | goto unlock; |
b26394bd | 1311 | } |
ee1cd515 AP |
1312 | config_group_init_type_name(&opts->func_inst.group, "", |
1313 | &printer_func_type); | |
b26394bd AP |
1314 | |
1315 | unlock: | |
1316 | mutex_unlock(&printer_ida_lock); | |
1317 | return ret; | |
1318 | } | |
1319 | ||
1320 | static void gprinter_free(struct usb_function *f) | |
1321 | { | |
1322 | struct printer_dev *dev = func_to_printer(f); | |
ee1cd515 | 1323 | struct f_printer_opts *opts; |
b26394bd | 1324 | |
ee1cd515 | 1325 | opts = container_of(f->fi, struct f_printer_opts, func_inst); |
b26394bd | 1326 | kfree(dev); |
ee1cd515 AP |
1327 | mutex_lock(&opts->lock); |
1328 | --opts->refcnt; | |
1329 | mutex_unlock(&opts->lock); | |
b26394bd AP |
1330 | } |
1331 | ||
1332 | static void printer_func_unbind(struct usb_configuration *c, | |
1333 | struct usb_function *f) | |
1334 | { | |
1335 | struct printer_dev *dev; | |
1336 | struct usb_request *req; | |
1337 | ||
1338 | dev = func_to_printer(f); | |
1339 | ||
1340 | device_destroy(usb_gadget_class, MKDEV(major, dev->minor)); | |
1341 | ||
1342 | /* Remove Character Device */ | |
1343 | cdev_del(&dev->printer_cdev); | |
1344 | ||
1345 | /* we must already have been disconnected ... no i/o may be active */ | |
1346 | WARN_ON(!list_empty(&dev->tx_reqs_active)); | |
1347 | WARN_ON(!list_empty(&dev->rx_reqs_active)); | |
1348 | ||
1349 | /* Free all memory for this driver. */ | |
1350 | while (!list_empty(&dev->tx_reqs)) { | |
1351 | req = container_of(dev->tx_reqs.next, struct usb_request, | |
1352 | list); | |
1353 | list_del(&req->list); | |
1354 | printer_req_free(dev->in_ep, req); | |
1355 | } | |
1356 | ||
1357 | if (dev->current_rx_req != NULL) | |
1358 | printer_req_free(dev->out_ep, dev->current_rx_req); | |
1359 | ||
1360 | while (!list_empty(&dev->rx_reqs)) { | |
1361 | req = container_of(dev->rx_reqs.next, | |
1362 | struct usb_request, list); | |
1363 | list_del(&req->list); | |
1364 | printer_req_free(dev->out_ep, req); | |
1365 | } | |
1366 | ||
1367 | while (!list_empty(&dev->rx_buffers)) { | |
1368 | req = container_of(dev->rx_buffers.next, | |
1369 | struct usb_request, list); | |
1370 | list_del(&req->list); | |
1371 | printer_req_free(dev->out_ep, req); | |
1372 | } | |
1373 | usb_free_all_descriptors(f); | |
1374 | } | |
1375 | ||
1376 | static struct usb_function *gprinter_alloc(struct usb_function_instance *fi) | |
1377 | { | |
1378 | struct printer_dev *dev; | |
1379 | struct f_printer_opts *opts; | |
1380 | ||
1381 | opts = container_of(fi, struct f_printer_opts, func_inst); | |
1382 | ||
ee1cd515 AP |
1383 | mutex_lock(&opts->lock); |
1384 | if (opts->minor >= minors) { | |
1385 | mutex_unlock(&opts->lock); | |
b26394bd | 1386 | return ERR_PTR(-ENOENT); |
ee1cd515 | 1387 | } |
b26394bd AP |
1388 | |
1389 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
ee1cd515 AP |
1390 | if (!dev) { |
1391 | mutex_unlock(&opts->lock); | |
b26394bd | 1392 | return ERR_PTR(-ENOMEM); |
ee1cd515 | 1393 | } |
b26394bd | 1394 | |
ee1cd515 | 1395 | ++opts->refcnt; |
b26394bd AP |
1396 | dev->minor = opts->minor; |
1397 | dev->pnp_string = opts->pnp_string; | |
1398 | dev->q_len = opts->q_len; | |
ee1cd515 | 1399 | mutex_unlock(&opts->lock); |
b26394bd AP |
1400 | |
1401 | dev->function.name = "printer"; | |
1402 | dev->function.bind = printer_func_bind; | |
1403 | dev->function.setup = printer_func_setup; | |
1404 | dev->function.unbind = printer_func_unbind; | |
1405 | dev->function.set_alt = printer_func_set_alt; | |
1406 | dev->function.disable = printer_func_disable; | |
1407 | dev->function.req_match = gprinter_req_match; | |
1408 | dev->function.free_func = gprinter_free; | |
1409 | ||
1410 | INIT_LIST_HEAD(&dev->tx_reqs); | |
1411 | INIT_LIST_HEAD(&dev->rx_reqs); | |
1412 | INIT_LIST_HEAD(&dev->rx_buffers); | |
1413 | INIT_LIST_HEAD(&dev->tx_reqs_active); | |
1414 | INIT_LIST_HEAD(&dev->rx_reqs_active); | |
1415 | ||
1416 | spin_lock_init(&dev->lock); | |
1417 | mutex_init(&dev->lock_printer_io); | |
1418 | init_waitqueue_head(&dev->rx_wait); | |
1419 | init_waitqueue_head(&dev->tx_wait); | |
1420 | init_waitqueue_head(&dev->tx_flush_wait); | |
1421 | ||
1422 | dev->interface = -1; | |
1423 | dev->printer_cdev_open = 0; | |
1424 | dev->printer_status = PRINTER_NOT_ERROR; | |
1425 | dev->current_rx_req = NULL; | |
1426 | dev->current_rx_bytes = 0; | |
1427 | dev->current_rx_buf = NULL; | |
1428 | ||
1429 | return &dev->function; | |
1430 | } | |
1431 | ||
1432 | DECLARE_USB_FUNCTION_INIT(printer, gprinter_alloc_inst, gprinter_alloc); | |
1433 | MODULE_LICENSE("GPL"); | |
1434 | MODULE_AUTHOR("Craig Nadler"); | |
1435 | ||
b185f01a AP |
1436 | static int gprinter_setup(int count) |
1437 | { | |
1438 | int status; | |
1439 | dev_t devt; | |
1440 | ||
1441 | usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget"); | |
1442 | if (IS_ERR(usb_gadget_class)) { | |
1443 | status = PTR_ERR(usb_gadget_class); | |
1444 | usb_gadget_class = NULL; | |
1445 | pr_err("unable to create usb_gadget class %d\n", status); | |
1446 | return status; | |
1447 | } | |
1448 | ||
1449 | status = alloc_chrdev_region(&devt, 0, count, "USB printer gadget"); | |
1450 | if (status) { | |
1451 | pr_err("alloc_chrdev_region %d\n", status); | |
1452 | class_destroy(usb_gadget_class); | |
1453 | usb_gadget_class = NULL; | |
1454 | return status; | |
1455 | } | |
1456 | ||
1457 | major = MAJOR(devt); | |
1458 | minors = count; | |
1459 | ||
1460 | return status; | |
1461 | } | |
1462 | ||
1463 | static void gprinter_cleanup(void) | |
1464 | { | |
1465 | if (major) { | |
1466 | unregister_chrdev_region(MKDEV(major, 0), minors); | |
1467 | major = minors = 0; | |
1468 | } | |
1469 | class_destroy(usb_gadget_class); | |
1470 | usb_gadget_class = NULL; | |
1471 | } |