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[XFRM]: skb_cow_data() does not set proper owner for new skbs.
[linux-2.6/verdex.git] / drivers / media / video / cpia_usb.c
blobcdda423386c5ca3cdf33246893a0f80a82729908
1 /*
2 * cpia_usb CPiA USB driver
3 *
4 * Supports CPiA based parallel port Video Camera's.
5 *
6 * Copyright (C) 1999 Jochen Scharrlach <Jochen.Scharrlach@schwaben.de>
7 * Copyright (C) 1999, 2000 Johannes Erdfelt <johannes@erdfelt.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24 /* define _CPIA_DEBUG_ for verbose debug output (see cpia.h) */
25 /* #define _CPIA_DEBUG_ 1 */
26
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/wait.h>
31 #include <linux/list.h>
32 #include <linux/slab.h>
33 #include <linux/vmalloc.h>
34 #include <linux/usb.h>
35
36 #include "cpia.h"
37
38 #define USB_REQ_CPIA_GRAB_FRAME 0xC1
39 #define USB_REQ_CPIA_UPLOAD_FRAME 0xC2
40 #define WAIT_FOR_NEXT_FRAME 0
41 #define FORCE_FRAME_UPLOAD 1
42
43 #define FRAMES_PER_DESC 10
44 #define FRAME_SIZE_PER_DESC 960 /* Shouldn't be hardcoded */
45 #define CPIA_NUMSBUF 2
46 #define STREAM_BUF_SIZE (PAGE_SIZE * 4)
47 #define SCRATCH_BUF_SIZE (STREAM_BUF_SIZE * 2)
48
49 struct cpia_sbuf {
50 char *data;
51 struct urb *urb;
52 };
53
54 #define FRAMEBUF_LEN (CPIA_MAX_FRAME_SIZE+100)
55 enum framebuf_status {
56 FRAME_EMPTY,
57 FRAME_READING,
58 FRAME_READY,
59 FRAME_ERROR,
60 };
61
62 struct framebuf {
63 int length;
64 enum framebuf_status status;
65 u8 data[FRAMEBUF_LEN];
66 struct framebuf *next;
67 };
68
69 struct usb_cpia {
70 /* Device structure */
71 struct usb_device *dev;
72
73 unsigned char iface;
74 wait_queue_head_t wq_stream;
75
76 int cursbuf; /* Current receiving sbuf */
77 struct cpia_sbuf sbuf[CPIA_NUMSBUF]; /* Double buffering */
78
79 int streaming;
80 int open;
81 int present;
82 struct framebuf *buffers[3];
83 struct framebuf *curbuff, *workbuff;
84 };
85
86 static int cpia_usb_open(void *privdata);
87 static int cpia_usb_registerCallback(void *privdata, void (*cb) (void *cbdata),
88 void *cbdata);
89 static int cpia_usb_transferCmd(void *privdata, u8 *command, u8 *data);
90 static int cpia_usb_streamStart(void *privdata);
91 static int cpia_usb_streamStop(void *privdata);
92 static int cpia_usb_streamRead(void *privdata, u8 *frame, int noblock);
93 static int cpia_usb_close(void *privdata);
94
95 #define ABOUT "USB driver for Vision CPiA based cameras"
96
97 static struct cpia_camera_ops cpia_usb_ops = {
98 cpia_usb_open,
99 cpia_usb_registerCallback,
100 cpia_usb_transferCmd,
101 cpia_usb_streamStart,
102 cpia_usb_streamStop,
103 cpia_usb_streamRead,
104 cpia_usb_close,
105 0,
106 THIS_MODULE
107 };
108
109 static LIST_HEAD(cam_list);
110 static spinlock_t cam_list_lock_usb;
111
112 static void cpia_usb_complete(struct urb *urb, struct pt_regs *regs)
113 {
114 int i;
115 char *cdata;
116 struct usb_cpia *ucpia;
117
118 if (!urb || !urb->context)
119 return;
120
121 ucpia = (struct usb_cpia *) urb->context;
122
123 if (!ucpia->dev || !ucpia->streaming || !ucpia->present || !ucpia->open)
124 return;
125
126 if (ucpia->workbuff->status == FRAME_EMPTY) {
127 ucpia->workbuff->status = FRAME_READING;
128 ucpia->workbuff->length = 0;
129 }
130
131 for (i = 0; i < urb->number_of_packets; i++) {
132 int n = urb->iso_frame_desc[i].actual_length;
133 int st = urb->iso_frame_desc[i].status;
134
135 cdata = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
136
137 if (st)
138 printk(KERN_DEBUG "cpia data error: [%d] len=%d, status=%X\n", i, n, st);
139
140 if (FRAMEBUF_LEN < ucpia->workbuff->length + n) {
141 printk(KERN_DEBUG "cpia: scratch buf overflow!scr_len: %d, n: %d\n", ucpia->workbuff->length, n);
142 return;
143 }
144
145 if (n) {
146 if ((ucpia->workbuff->length > 0) ||
147 (0x19 == cdata[0] && 0x68 == cdata[1])) {
148 memcpy(ucpia->workbuff->data + ucpia->workbuff->length, cdata, n);
149 ucpia->workbuff->length += n;
150 } else
151 DBG("Ignoring packet!\n");
152 } else {
153 if (ucpia->workbuff->length > 4 &&
154 0xff == ucpia->workbuff->data[ucpia->workbuff->length-1] &&
155 0xff == ucpia->workbuff->data[ucpia->workbuff->length-2] &&
156 0xff == ucpia->workbuff->data[ucpia->workbuff->length-3] &&
157 0xff == ucpia->workbuff->data[ucpia->workbuff->length-4]) {
158 ucpia->workbuff->status = FRAME_READY;
159 ucpia->curbuff = ucpia->workbuff;
160 ucpia->workbuff = ucpia->workbuff->next;
161 ucpia->workbuff->status = FRAME_EMPTY;
162 ucpia->workbuff->length = 0;
163
164 if (waitqueue_active(&ucpia->wq_stream))
165 wake_up_interruptible(&ucpia->wq_stream);
166 }
167 }
168 }
169
170 /* resubmit */
171 urb->dev = ucpia->dev;
172 if ((i = usb_submit_urb(urb, GFP_ATOMIC)) != 0)
173 printk(KERN_ERR "%s: usb_submit_urb ret %d\n", __FUNCTION__, i);
174 }
175
176 static int cpia_usb_open(void *privdata)
177 {
178 struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
179 struct urb *urb;
180 int ret, retval = 0, fx, err;
181
182 if (!ucpia)
183 return -EINVAL;
184
185 ucpia->sbuf[0].data = kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
186 if (!ucpia->sbuf[0].data)
187 return -EINVAL;
188
189 ucpia->sbuf[1].data = kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
190 if (!ucpia->sbuf[1].data) {
191 retval = -EINVAL;
192 goto error_0;
193 }
194
195 ret = usb_set_interface(ucpia->dev, ucpia->iface, 3);
196 if (ret < 0) {
197 printk(KERN_ERR "cpia_usb_open: usb_set_interface error (ret = %d)\n", ret);
198 retval = -EBUSY;
199 goto error_1;
200 }
201
202 ucpia->buffers[0]->status = FRAME_EMPTY;
203 ucpia->buffers[0]->length = 0;
204 ucpia->buffers[1]->status = FRAME_EMPTY;
205 ucpia->buffers[1]->length = 0;
206 ucpia->buffers[2]->status = FRAME_EMPTY;
207 ucpia->buffers[2]->length = 0;
208 ucpia->curbuff = ucpia->buffers[0];
209 ucpia->workbuff = ucpia->buffers[1];
210
211 /* We double buffer the Iso lists, and also know the polling
212 * interval is every frame (1 == (1 << (bInterval -1))).
213 */
214 urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
215 if (!urb) {
216 printk(KERN_ERR "cpia_init_isoc: usb_alloc_urb 0\n");
217 retval = -ENOMEM;
218 goto error_1;
219 }
220
221 ucpia->sbuf[0].urb = urb;
222 urb->dev = ucpia->dev;
223 urb->context = ucpia;
224 urb->pipe = usb_rcvisocpipe(ucpia->dev, 1);
225 urb->transfer_flags = URB_ISO_ASAP;
226 urb->transfer_buffer = ucpia->sbuf[0].data;
227 urb->complete = cpia_usb_complete;
228 urb->number_of_packets = FRAMES_PER_DESC;
229 urb->interval = 1;
230 urb->transfer_buffer_length = FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;
231 for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
232 urb->iso_frame_desc[fx].offset = FRAME_SIZE_PER_DESC * fx;
233 urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
234 }
235
236 urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
237 if (!urb) {
238 printk(KERN_ERR "cpia_init_isoc: usb_alloc_urb 1\n");
239 retval = -ENOMEM;
240 goto error_urb0;
241 }
242
243 ucpia->sbuf[1].urb = urb;
244 urb->dev = ucpia->dev;
245 urb->context = ucpia;
246 urb->pipe = usb_rcvisocpipe(ucpia->dev, 1);
247 urb->transfer_flags = URB_ISO_ASAP;
248 urb->transfer_buffer = ucpia->sbuf[1].data;
249 urb->complete = cpia_usb_complete;
250 urb->number_of_packets = FRAMES_PER_DESC;
251 urb->interval = 1;
252 urb->transfer_buffer_length = FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;
253 for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
254 urb->iso_frame_desc[fx].offset = FRAME_SIZE_PER_DESC * fx;
255 urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
256 }
257
258 /* queue the ISO urbs, and resubmit in the completion handler */
259 err = usb_submit_urb(ucpia->sbuf[0].urb, GFP_KERNEL);
260 if (err) {
261 printk(KERN_ERR "cpia_init_isoc: usb_submit_urb 0 ret %d\n",
262 err);
263 goto error_urb1;
264 }
265 err = usb_submit_urb(ucpia->sbuf[1].urb, GFP_KERNEL);
266 if (err) {
267 printk(KERN_ERR "cpia_init_isoc: usb_submit_urb 1 ret %d\n",
268 err);
269 goto error_urb1;
270 }
271
272 ucpia->streaming = 1;
273 ucpia->open = 1;
274
275 return 0;
276
277 error_urb1: /* free urb 1 */
278 usb_free_urb(ucpia->sbuf[1].urb);
279 ucpia->sbuf[1].urb = NULL;
280 error_urb0: /* free urb 0 */
281 usb_free_urb(ucpia->sbuf[0].urb);
282 ucpia->sbuf[0].urb = NULL;
283 error_1:
284 kfree (ucpia->sbuf[1].data);
285 ucpia->sbuf[1].data = NULL;
286 error_0:
287 kfree (ucpia->sbuf[0].data);
288 ucpia->sbuf[0].data = NULL;
289
290 return retval;
291 }
292
293 //
294 // convenience functions
295 //
296
297 /****************************************************************************
298 *
299 * WritePacket
300 *
301 ***************************************************************************/
302 static int WritePacket(struct usb_device *udev, const u8 *packet, u8 *buf, size_t size)
303 {
304 if (!packet)
305 return -EINVAL;
306
307 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
308 packet[1] + (packet[0] << 8),
309 USB_TYPE_VENDOR | USB_RECIP_DEVICE,
310 packet[2] + (packet[3] << 8),
311 packet[4] + (packet[5] << 8), buf, size, 1000);
312 }
313
314 /****************************************************************************
315 *
316 * ReadPacket
317 *
318 ***************************************************************************/
319 static int ReadPacket(struct usb_device *udev, u8 *packet, u8 *buf, size_t size)
320 {
321 if (!packet || size <= 0)
322 return -EINVAL;
323
324 return usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
325 packet[1] + (packet[0] << 8),
326 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
327 packet[2] + (packet[3] << 8),
328 packet[4] + (packet[5] << 8), buf, size, 1000);
329 }
330
331 static int cpia_usb_transferCmd(void *privdata, u8 *command, u8 *data)
332 {
333 int err = 0;
334 int databytes;
335 struct usb_cpia *ucpia = (struct usb_cpia *)privdata;
336 struct usb_device *udev = ucpia->dev;
337
338 if (!udev) {
339 DBG("Internal driver error: udev is NULL\n");
340 return -EINVAL;
341 }
342
343 if (!command) {
344 DBG("Internal driver error: command is NULL\n");
345 return -EINVAL;
346 }
347
348 databytes = (((int)command[7])<<8) | command[6];
349
350 if (command[0] == DATA_IN) {
351 u8 buffer[8];
352
353 if (!data) {
354 DBG("Internal driver error: data is NULL\n");
355 return -EINVAL;
356 }
357
358 err = ReadPacket(udev, command, buffer, 8);
359 if (err < 0)
360 return err;
361
362 memcpy(data, buffer, databytes);
363 } else if(command[0] == DATA_OUT)
364 WritePacket(udev, command, data, databytes);
365 else {
366 DBG("Unexpected first byte of command: %x\n", command[0]);
367 err = -EINVAL;
368 }
369
370 return 0;
371 }
372
373 static int cpia_usb_registerCallback(void *privdata, void (*cb) (void *cbdata),
374 void *cbdata)
375 {
376 return -ENODEV;
377 }
378
379 static int cpia_usb_streamStart(void *privdata)
380 {
381 return -ENODEV;
382 }
383
384 static int cpia_usb_streamStop(void *privdata)
385 {
386 return -ENODEV;
387 }
388
389 static int cpia_usb_streamRead(void *privdata, u8 *frame, int noblock)
390 {
391 struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
392 struct framebuf *mybuff;
393
394 if (!ucpia || !ucpia->present)
395 return -1;
396
397 if (ucpia->curbuff->status != FRAME_READY)
398 interruptible_sleep_on(&ucpia->wq_stream);
399 else
400 DBG("Frame already waiting!\n");
401
402 mybuff = ucpia->curbuff;
403
404 if (!mybuff)
405 return -1;
406
407 if (mybuff->status != FRAME_READY || mybuff->length < 4) {
408 DBG("Something went wrong!\n");
409 return -1;
410 }
411
412 memcpy(frame, mybuff->data, mybuff->length);
413 mybuff->status = FRAME_EMPTY;
414
415 /* DBG("read done, %d bytes, Header: %x/%x, Footer: %x%x%x%x\n", */
416 /* mybuff->length, frame[0], frame[1], */
417 /* frame[mybuff->length-4], frame[mybuff->length-3], */
418 /* frame[mybuff->length-2], frame[mybuff->length-1]); */
419
420 return mybuff->length;
421 }
422
423 static void cpia_usb_free_resources(struct usb_cpia *ucpia, int try)
424 {
425 if (!ucpia->streaming)
426 return;
427
428 ucpia->streaming = 0;
429
430 /* Set packet size to 0 */
431 if (try) {
432 int ret;
433
434 ret = usb_set_interface(ucpia->dev, ucpia->iface, 0);
435 if (ret < 0) {
436 printk(KERN_ERR "usb_set_interface error (ret = %d)\n", ret);
437 return;
438 }
439 }
440
441 /* Unschedule all of the iso td's */
442 if (ucpia->sbuf[1].urb) {
443 usb_kill_urb(ucpia->sbuf[1].urb);
444 usb_free_urb(ucpia->sbuf[1].urb);
445 ucpia->sbuf[1].urb = NULL;
446 }
447
448 if (ucpia->sbuf[1].data) {
449 kfree(ucpia->sbuf[1].data);
450 ucpia->sbuf[1].data = NULL;
451 }
452
453 if (ucpia->sbuf[0].urb) {
454 usb_kill_urb(ucpia->sbuf[0].urb);
455 usb_free_urb(ucpia->sbuf[0].urb);
456 ucpia->sbuf[0].urb = NULL;
457 }
458
459 if (ucpia->sbuf[0].data) {
460 kfree(ucpia->sbuf[0].data);
461 ucpia->sbuf[0].data = NULL;
462 }
463 }
464
465 static int cpia_usb_close(void *privdata)
466 {
467 struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
468
469 if(!ucpia)
470 return -ENODEV;
471
472 ucpia->open = 0;
473
474 /* ucpia->present = 0 protects against trying to reset the
475 * alt setting if camera is physically disconnected while open */
476 cpia_usb_free_resources(ucpia, ucpia->present);
477
478 return 0;
479 }
480
481 int cpia_usb_init(void)
482 {
483 /* return -ENODEV; */
484 return 0;
485 }
486
487 /* Probing and initializing */
488
489 static int cpia_probe(struct usb_interface *intf,
490 const struct usb_device_id *id)
491 {
492 struct usb_device *udev = interface_to_usbdev(intf);
493 struct usb_host_interface *interface;
494 struct usb_cpia *ucpia;
495 struct cam_data *cam;
496 int ret;
497
498 /* A multi-config CPiA camera? */
499 if (udev->descriptor.bNumConfigurations != 1)
500 return -ENODEV;
501
502 interface = intf->cur_altsetting;
503
504 printk(KERN_INFO "USB CPiA camera found\n");
505
506 ucpia = kmalloc(sizeof(*ucpia), GFP_KERNEL);
507 if (!ucpia) {
508 printk(KERN_ERR "couldn't kmalloc cpia struct\n");
509 return -ENOMEM;
510 }
511
512 memset(ucpia, 0, sizeof(*ucpia));
513
514 ucpia->dev = udev;
515 ucpia->iface = interface->desc.bInterfaceNumber;
516 init_waitqueue_head(&ucpia->wq_stream);
517
518 ucpia->buffers[0] = vmalloc(sizeof(*ucpia->buffers[0]));
519 if (!ucpia->buffers[0]) {
520 printk(KERN_ERR "couldn't vmalloc frame buffer 0\n");
521 goto fail_alloc_0;
522 }
523
524 ucpia->buffers[1] = vmalloc(sizeof(*ucpia->buffers[1]));
525 if (!ucpia->buffers[1]) {
526 printk(KERN_ERR "couldn't vmalloc frame buffer 1\n");
527 goto fail_alloc_1;
528 }
529
530 ucpia->buffers[2] = vmalloc(sizeof(*ucpia->buffers[2]));
531 if (!ucpia->buffers[2]) {
532 printk(KERN_ERR "couldn't vmalloc frame buffer 2\n");
533 goto fail_alloc_2;
534 }
535
536 ucpia->buffers[0]->next = ucpia->buffers[1];
537 ucpia->buffers[1]->next = ucpia->buffers[2];
538 ucpia->buffers[2]->next = ucpia->buffers[0];
539
540 ret = usb_set_interface(udev, ucpia->iface, 0);
541 if (ret < 0) {
542 printk(KERN_ERR "cpia_probe: usb_set_interface error (ret = %d)\n", ret);
543 /* goto fail_all; */
544 }
545
546 /* Before register_camera, important */
547 ucpia->present = 1;
548
549 cam = cpia_register_camera(&cpia_usb_ops, ucpia);
550 if (!cam) {
551 LOG("failed to cpia_register_camera\n");
552 goto fail_all;
553 }
554
555 spin_lock( &cam_list_lock_usb );
556 list_add( &cam->cam_data_list, &cam_list );
557 spin_unlock( &cam_list_lock_usb );
558
559 usb_set_intfdata(intf, cam);
560 return 0;
561
562 fail_all:
563 vfree(ucpia->buffers[2]);
564 ucpia->buffers[2] = NULL;
565 fail_alloc_2:
566 vfree(ucpia->buffers[1]);
567 ucpia->buffers[1] = NULL;
568 fail_alloc_1:
569 vfree(ucpia->buffers[0]);
570 ucpia->buffers[0] = NULL;
571 fail_alloc_0:
572 kfree(ucpia);
573 return -EIO;
574 }
575
576 static void cpia_disconnect(struct usb_interface *intf);
577
578 static struct usb_device_id cpia_id_table [] = {
579 { USB_DEVICE(0x0553, 0x0002) },
580 { USB_DEVICE(0x0813, 0x0001) },
581 { } /* Terminating entry */
582 };
583
584 MODULE_DEVICE_TABLE (usb, cpia_id_table);
585 MODULE_LICENSE("GPL");
586
587
588 static struct usb_driver cpia_driver = {
589 .owner = THIS_MODULE,
590 .name = "cpia",
591 .probe = cpia_probe,
592 .disconnect = cpia_disconnect,
593 .id_table = cpia_id_table,
594 };
595
596 static void cpia_disconnect(struct usb_interface *intf)
597 {
598 struct cam_data *cam = usb_get_intfdata(intf);
599 struct usb_cpia *ucpia;
600 struct usb_device *udev;
601
602 usb_set_intfdata(intf, NULL);
603 if (!cam)
604 return;
605
606 ucpia = (struct usb_cpia *) cam->lowlevel_data;
607 spin_lock( &cam_list_lock_usb );
608 list_del(&cam->cam_data_list);
609 spin_unlock( &cam_list_lock_usb );
610
611 ucpia->present = 0;
612
613 cpia_unregister_camera(cam);
614 if(ucpia->open)
615 cpia_usb_close(cam->lowlevel_data);
616
617 ucpia->curbuff->status = FRAME_ERROR;
618
619 if (waitqueue_active(&ucpia->wq_stream))
620 wake_up_interruptible(&ucpia->wq_stream);
621
622 udev = interface_to_usbdev(intf);
623
624 ucpia->curbuff = ucpia->workbuff = NULL;
625
626 if (ucpia->buffers[2]) {
627 vfree(ucpia->buffers[2]);
628 ucpia->buffers[2] = NULL;
629 }
630
631 if (ucpia->buffers[1]) {
632 vfree(ucpia->buffers[1]);
633 ucpia->buffers[1] = NULL;
634 }
635
636 if (ucpia->buffers[0]) {
637 vfree(ucpia->buffers[0]);
638 ucpia->buffers[0] = NULL;
639 }
640
641 cam->lowlevel_data = NULL;
642 kfree(ucpia);
643 }
644
645 static int __init usb_cpia_init(void)
646 {
647 printk(KERN_INFO "%s v%d.%d.%d\n",ABOUT,
648 CPIA_USB_MAJ_VER,CPIA_USB_MIN_VER,CPIA_USB_PATCH_VER);
649
650 spin_lock_init(&cam_list_lock_usb);
651 return usb_register(&cpia_driver);
652 }
653
654 static void __exit usb_cpia_cleanup(void)
655 {
656 usb_deregister(&cpia_driver);
657 }
658
659
660 module_init (usb_cpia_init);
661 module_exit (usb_cpia_cleanup);
662
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