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[PATCH] USB: Add ZC0301 Video4Linux2 driver
[linux-2.6/verdex.git] / drivers / usb / media / zc0301_core.c
blob238f60f7f47240f414ebedbbd575c740292ff5a7
1 /***************************************************************************
2 * Video4Linux2 driver for ZC0301 Image Processor and Control Chip *
3 * *
4 * Copyright (C) 2006 by Luca Risolia <luca.risolia@studio.unibo.it> *
5 * *
6 * Informations about the chip internals to enable the I2C protocol have *
7 * been taken from the documentation of the ZC030x Video4Linux1 driver *
8 * written by Andrew Birkett <andy@nobugs.org> *
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 * This program is distributed in the hope that it will be useful, *
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
18 * GNU General Public License for more details. *
19 * *
20 * You should have received a copy of the GNU General Public License *
21 * along with this program; if not, write to the Free Software *
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
23 ***************************************************************************/
24
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/param.h>
29 #include <linux/moduleparam.h>
30 #include <linux/errno.h>
31 #include <linux/slab.h>
32 #include <linux/string.h>
33 #include <linux/device.h>
34 #include <linux/fs.h>
35 #include <linux/delay.h>
36 #include <linux/stddef.h>
37 #include <linux/compiler.h>
38 #include <linux/ioctl.h>
39 #include <linux/poll.h>
40 #include <linux/stat.h>
41 #include <linux/mm.h>
42 #include <linux/vmalloc.h>
43 #include <linux/page-flags.h>
44 #include <linux/byteorder/generic.h>
45 #include <asm/page.h>
46 #include <asm/uaccess.h>
47
48 #include "zc0301.h"
49
50 /*****************************************************************************/
51
52 #define ZC0301_MODULE_NAME "V4L2 driver for ZC0301 " \
53 "Image Processor and Control Chip"
54 #define ZC0301_MODULE_AUTHOR "(C) 2006 Luca Risolia"
55 #define ZC0301_AUTHOR_EMAIL "<luca.risolia@studio.unibo.it>"
56 #define ZC0301_MODULE_LICENSE "GPL"
57 #define ZC0301_MODULE_VERSION "1:1.00"
58 #define ZC0301_MODULE_VERSION_CODE KERNEL_VERSION(1, 0, 0)
59
60 /*****************************************************************************/
61
62 MODULE_DEVICE_TABLE(usb, zc0301_id_table);
63
64 MODULE_AUTHOR(ZC0301_MODULE_AUTHOR " " ZC0301_AUTHOR_EMAIL);
65 MODULE_DESCRIPTION(ZC0301_MODULE_NAME);
66 MODULE_VERSION(ZC0301_MODULE_VERSION);
67 MODULE_LICENSE(ZC0301_MODULE_LICENSE);
68
69 static short video_nr[] = {[0 ... ZC0301_MAX_DEVICES-1] = -1};
70 module_param_array(video_nr, short, NULL, 0444);
71 MODULE_PARM_DESC(video_nr,
72 "\n<-1|n[,...]> Specify V4L2 minor mode number."
73 "\n -1 = use next available (default)"
74 "\n n = use minor number n (integer >= 0)"
75 "\nYou can specify up to "
76 __MODULE_STRING(ZC0301_MAX_DEVICES) " cameras this way."
77 "\nFor example:"
78 "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
79 "\nthe second registered camera and use auto for the first"
80 "\none and for every other camera."
81 "\n");
82
83 static short force_munmap[] = {[0 ... ZC0301_MAX_DEVICES-1] =
84 ZC0301_FORCE_MUNMAP};
85 module_param_array(force_munmap, bool, NULL, 0444);
86 MODULE_PARM_DESC(force_munmap,
87 "\n<0|1[,...]> Force the application to unmap previously"
88 "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
89 "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
90 "\nthis feature. This parameter is specific for each"
91 "\ndetected camera."
92 "\n 0 = do not force memory unmapping"
93 "\n 1 = force memory unmapping (save memory)"
94 "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
95 "\n");
96
97 #ifdef ZC0301_DEBUG
98 static unsigned short debug = ZC0301_DEBUG_LEVEL;
99 module_param(debug, ushort, 0644);
100 MODULE_PARM_DESC(debug,
101 "\n<n> Debugging information level, from 0 to 3:"
102 "\n0 = none (use carefully)"
103 "\n1 = critical errors"
104 "\n2 = significant informations"
105 "\n3 = more verbose messages"
106 "\nLevel 3 is useful for testing only, when only "
107 "one device is used."
108 "\nDefault value is "__MODULE_STRING(ZC0301_DEBUG_LEVEL)"."
109 "\n");
110 #endif
111
112 /*****************************************************************************/
113
114 static u32
115 zc0301_request_buffers(struct zc0301_device* cam, u32 count,
116 enum zc0301_io_method io)
117 {
118 struct v4l2_pix_format* p = &(cam->sensor->pix_format);
119 struct v4l2_rect* r = &(cam->sensor->cropcap.bounds);
120 const size_t imagesize = cam->module_param.force_munmap ||
121 io == IO_READ ?
122 (p->width * p->height * p->priv) / 8 :
123 (r->width * r->height * p->priv) / 8;
124 void* buff = NULL;
125 u32 i;
126
127 if (count > ZC0301_MAX_FRAMES)
128 count = ZC0301_MAX_FRAMES;
129
130 cam->nbuffers = count;
131 while (cam->nbuffers > 0) {
132 if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
133 break;
134 cam->nbuffers--;
135 }
136
137 for (i = 0; i < cam->nbuffers; i++) {
138 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
139 cam->frame[i].buf.index = i;
140 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
141 cam->frame[i].buf.length = imagesize;
142 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
143 cam->frame[i].buf.sequence = 0;
144 cam->frame[i].buf.field = V4L2_FIELD_NONE;
145 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
146 cam->frame[i].buf.flags = 0;
147 }
148
149 return cam->nbuffers;
150 }
151
152
153 static void zc0301_release_buffers(struct zc0301_device* cam)
154 {
155 if (cam->nbuffers) {
156 vfree(cam->frame[0].bufmem);
157 cam->nbuffers = 0;
158 }
159 cam->frame_current = NULL;
160 }
161
162
163 static void zc0301_empty_framequeues(struct zc0301_device* cam)
164 {
165 u32 i;
166
167 INIT_LIST_HEAD(&cam->inqueue);
168 INIT_LIST_HEAD(&cam->outqueue);
169
170 for (i = 0; i < ZC0301_MAX_FRAMES; i++) {
171 cam->frame[i].state = F_UNUSED;
172 cam->frame[i].buf.bytesused = 0;
173 }
174 }
175
176
177 static void zc0301_requeue_outqueue(struct zc0301_device* cam)
178 {
179 struct zc0301_frame_t *i;
180
181 list_for_each_entry(i, &cam->outqueue, frame) {
182 i->state = F_QUEUED;
183 list_add(&i->frame, &cam->inqueue);
184 }
185
186 INIT_LIST_HEAD(&cam->outqueue);
187 }
188
189
190 static void zc0301_queue_unusedframes(struct zc0301_device* cam)
191 {
192 unsigned long lock_flags;
193 u32 i;
194
195 for (i = 0; i < cam->nbuffers; i++)
196 if (cam->frame[i].state == F_UNUSED) {
197 cam->frame[i].state = F_QUEUED;
198 spin_lock_irqsave(&cam->queue_lock, lock_flags);
199 list_add_tail(&cam->frame[i].frame, &cam->inqueue);
200 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
201 }
202 }
203
204 /*****************************************************************************/
205
206 int zc0301_write_reg(struct zc0301_device* cam, u16 index, u16 value)
207 {
208 struct usb_device* udev = cam->usbdev;
209 int res;
210
211 res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0xa0, 0x40,
212 value, index, NULL, 0, ZC0301_CTRL_TIMEOUT);
213 if (res < 0) {
214 DBG(3, "Failed to write a register (index 0x%04X, "
215 "value 0x%02X, error %d)",index, value, res);
216 return -1;
217 }
218
219 return 0;
220 }
221
222
223 int zc0301_read_reg(struct zc0301_device* cam, u16 index)
224 {
225 struct usb_device* udev = cam->usbdev;
226 u8* buff = cam->control_buffer;
227 int res;
228
229 res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0xa1, 0xc0,
230 0x0001, index, buff, 1, ZC0301_CTRL_TIMEOUT);
231 if (res < 0)
232 DBG(3, "Failed to read a register (index 0x%04X, error %d)",
233 index, res);
234
235 PDBGG("Read: index 0x%04X, value: 0x%04X", index, (int)(*buff));
236
237 return (res >= 0) ? (int)(*buff) : -1;
238 }
239
240
241 int zc0301_i2c_read(struct zc0301_device* cam, u16 address, u8 length)
242 {
243 int err = 0, res, r0, r1;
244
245 err += zc0301_write_reg(cam, 0x0092, address);
246 err += zc0301_write_reg(cam, 0x0090, 0x02);
247
248 msleep(1);
249
250 res = zc0301_read_reg(cam, 0x0091);
251 if (res < 0)
252 err += res;
253 r0 = zc0301_read_reg(cam, 0x0095);
254 if (r0 < 0)
255 err += r0;
256 r1 = zc0301_read_reg(cam, 0x0096);
257 if (r1 < 0)
258 err += r1;
259
260 res = (length <= 1) ? r0 : r0 | (r1 << 8);
261
262 if (err)
263 DBG(3, "I2C read failed at address 0x%04X, value: 0x%04X",
264 address, res);
265
266
267 PDBGG("I2C read: address 0x%04X, value: 0x%04X", address, res);
268
269 return err ? -1 : res;
270 }
271
272
273 int zc0301_i2c_write(struct zc0301_device* cam, u16 address, u16 value)
274 {
275 int err = 0, res;
276
277 err += zc0301_write_reg(cam, 0x0092, address);
278 err += zc0301_write_reg(cam, 0x0093, value & 0xff);
279 err += zc0301_write_reg(cam, 0x0094, value >> 8);
280 err += zc0301_write_reg(cam, 0x0090, 0x01);
281
282 msleep(1);
283
284 res = zc0301_read_reg(cam, 0x0091);
285 if (res < 0)
286 err += res;
287
288 if (err)
289 DBG(3, "I2C write failed at address 0x%04X, value: 0x%04X",
290 address, value);
291
292 PDBGG("I2C write: address 0x%04X, value: 0x%04X", address, value);
293
294 return err ? -1 : 0;
295 }
296
297 /*****************************************************************************/
298
299 static void zc0301_urb_complete(struct urb *urb, struct pt_regs* regs)
300 {
301 struct zc0301_device* cam = urb->context;
302 struct zc0301_frame_t** f;
303 size_t imagesize;
304 u8 i;
305 int err = 0;
306
307 if (urb->status == -ENOENT)
308 return;
309
310 f = &cam->frame_current;
311
312 if (cam->stream == STREAM_INTERRUPT) {
313 cam->stream = STREAM_OFF;
314 if ((*f))
315 (*f)->state = F_QUEUED;
316 DBG(3, "Stream interrupted");
317 wake_up_interruptible(&cam->wait_stream);
318 }
319
320 if (cam->state & DEV_DISCONNECTED)
321 return;
322
323 if (cam->state & DEV_MISCONFIGURED) {
324 wake_up_interruptible(&cam->wait_frame);
325 return;
326 }
327
328 if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
329 goto resubmit_urb;
330
331 if (!(*f))
332 (*f) = list_entry(cam->inqueue.next, struct zc0301_frame_t,
333 frame);
334
335 imagesize = (cam->sensor->pix_format.width *
336 cam->sensor->pix_format.height *
337 cam->sensor->pix_format.priv) / 8;
338
339 for (i = 0; i < urb->number_of_packets; i++) {
340 unsigned int len, status;
341 void *pos;
342 u16* soi;
343 u8 sof;
344
345 len = urb->iso_frame_desc[i].actual_length;
346 status = urb->iso_frame_desc[i].status;
347 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
348
349 if (status) {
350 DBG(3, "Error in isochronous frame");
351 (*f)->state = F_ERROR;
352 continue;
353 }
354
355 sof = (*(soi = pos) == 0xd8ff);
356
357 PDBGG("Isochrnous frame: length %u, #%u i,", len, i);
358
359 if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
360 start_of_frame:
361 if (sof) {
362 (*f)->state = F_GRABBING;
363 (*f)->buf.bytesused = 0;
364 do_gettimeofday(&(*f)->buf.timestamp);
365 DBG(3, "SOF detected: new video frame");
366 }
367
368 if ((*f)->state == F_GRABBING) {
369 if (sof && (*f)->buf.bytesused)
370 goto end_of_frame;
371
372 if ((*f)->buf.bytesused + len > imagesize) {
373 DBG(3, "Video frame size exceeded");
374 (*f)->state = F_ERROR;
375 continue;
376 }
377
378 memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, len);
379 (*f)->buf.bytesused += len;
380
381 if ((*f)->buf.bytesused == imagesize) {
382 u32 b;
383 end_of_frame:
384 b = (*f)->buf.bytesused;
385 (*f)->state = F_DONE;
386 (*f)->buf.sequence= ++cam->frame_count;
387 spin_lock(&cam->queue_lock);
388 list_move_tail(&(*f)->frame, &cam->outqueue);
389 if (!list_empty(&cam->inqueue))
390 (*f) = list_entry(cam->inqueue.next,
391 struct zc0301_frame_t,
392 frame);
393 else
394 (*f) = NULL;
395 spin_unlock(&cam->queue_lock);
396 DBG(3, "Video frame captured: : %lu bytes",
397 (unsigned long)(b));
398
399 if (!(*f))
400 goto resubmit_urb;
401
402 if (sof)
403 goto start_of_frame;
404 }
405 }
406 }
407
408 resubmit_urb:
409 urb->dev = cam->usbdev;
410 err = usb_submit_urb(urb, GFP_ATOMIC);
411 if (err < 0 && err != -EPERM) {
412 cam->state |= DEV_MISCONFIGURED;
413 DBG(1, "usb_submit_urb() failed");
414 }
415
416 wake_up_interruptible(&cam->wait_frame);
417 }
418
419
420 static int zc0301_start_transfer(struct zc0301_device* cam)
421 {
422 struct usb_device *udev = cam->usbdev;
423 struct urb* urb;
424 const unsigned int wMaxPacketSize[] = {0, 128, 192, 256, 384,
425 512, 768, 1023};
426 const unsigned int psz = wMaxPacketSize[ZC0301_ALTERNATE_SETTING];
427 s8 i, j;
428 int err = 0;
429
430 for (i = 0; i < ZC0301_URBS; i++) {
431 cam->transfer_buffer[i] = kzalloc(ZC0301_ISO_PACKETS * psz,
432 GFP_KERNEL);
433 if (!cam->transfer_buffer[i]) {
434 err = -ENOMEM;
435 DBG(1, "Not enough memory");
436 goto free_buffers;
437 }
438 }
439
440 for (i = 0; i < ZC0301_URBS; i++) {
441 urb = usb_alloc_urb(ZC0301_ISO_PACKETS, GFP_KERNEL);
442 cam->urb[i] = urb;
443 if (!urb) {
444 err = -ENOMEM;
445 DBG(1, "usb_alloc_urb() failed");
446 goto free_urbs;
447 }
448 urb->dev = udev;
449 urb->context = cam;
450 urb->pipe = usb_rcvisocpipe(udev, 1);
451 urb->transfer_flags = URB_ISO_ASAP;
452 urb->number_of_packets = ZC0301_ISO_PACKETS;
453 urb->complete = zc0301_urb_complete;
454 urb->transfer_buffer = cam->transfer_buffer[i];
455 urb->transfer_buffer_length = psz * ZC0301_ISO_PACKETS;
456 urb->interval = 1;
457 for (j = 0; j < ZC0301_ISO_PACKETS; j++) {
458 urb->iso_frame_desc[j].offset = psz * j;
459 urb->iso_frame_desc[j].length = psz;
460 }
461 }
462
463 err = usb_set_interface(udev, 0, ZC0301_ALTERNATE_SETTING);
464 if (err) {
465 DBG(1, "usb_set_interface() failed");
466 goto free_urbs;
467 }
468
469 cam->frame_current = NULL;
470
471 for (i = 0; i < ZC0301_URBS; i++) {
472 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
473 if (err) {
474 for (j = i-1; j >= 0; j--)
475 usb_kill_urb(cam->urb[j]);
476 DBG(1, "usb_submit_urb() failed, error %d", err);
477 goto free_urbs;
478 }
479 }
480
481 return 0;
482
483 free_urbs:
484 for (i = 0; (i < ZC0301_URBS) && cam->urb[i]; i++)
485 usb_free_urb(cam->urb[i]);
486
487 free_buffers:
488 for (i = 0; (i < ZC0301_URBS) && cam->transfer_buffer[i]; i++)
489 kfree(cam->transfer_buffer[i]);
490
491 return err;
492 }
493
494
495 static int zc0301_stop_transfer(struct zc0301_device* cam)
496 {
497 struct usb_device *udev = cam->usbdev;
498 s8 i;
499 int err = 0;
500
501 if (cam->state & DEV_DISCONNECTED)
502 return 0;
503
504 for (i = ZC0301_URBS-1; i >= 0; i--) {
505 usb_kill_urb(cam->urb[i]);
506 usb_free_urb(cam->urb[i]);
507 kfree(cam->transfer_buffer[i]);
508 }
509
510 err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
511 if (err)
512 DBG(3, "usb_set_interface() failed");
513
514 return err;
515 }
516
517
518 static int zc0301_stream_interrupt(struct zc0301_device* cam)
519 {
520 long timeout;
521
522 cam->stream = STREAM_INTERRUPT;
523 timeout = wait_event_timeout(cam->wait_stream,
524 (cam->stream == STREAM_OFF) ||
525 (cam->state & DEV_DISCONNECTED),
526 ZC0301_URB_TIMEOUT);
527 if (cam->state & DEV_DISCONNECTED)
528 return -ENODEV;
529 else if (!timeout) {
530 cam->state |= DEV_MISCONFIGURED;
531 DBG(1, "URB timeout reached. The camera is misconfigured. To "
532 "use it, close and open /dev/video%d again.",
533 cam->v4ldev->minor);
534 return -EIO;
535 }
536
537 return 0;
538 }
539
540 /*****************************************************************************/
541
542 static int
543 zc0301_set_compression(struct zc0301_device* cam,
544 struct v4l2_jpegcompression* compression)
545 {
546 int r, err = 0;
547
548 if ((r = zc0301_read_reg(cam, 0x0008)) < 0)
549 err += r;
550 err += zc0301_write_reg(cam, 0x0008,
551 r | 0x11 | (compression->quality >> 1));
552
553 return err ? -EIO : 0;
554 }
555
556
557 static int zc0301_init(struct zc0301_device* cam)
558 {
559 struct zc0301_sensor* s = cam->sensor;
560 struct v4l2_control ctrl;
561 struct v4l2_queryctrl *qctrl;
562 struct v4l2_rect* rect;
563 u8 i = 0;
564 int err = 0;
565
566 if (!(cam->state & DEV_INITIALIZED)) {
567 init_waitqueue_head(&cam->open);
568 qctrl = s->qctrl;
569 rect = &(s->cropcap.defrect);
570 cam->compression.quality = ZC0301_COMPRESSION_QUALITY;
571 } else { /* use current values */
572 qctrl = s->_qctrl;
573 rect = &(s->_rect);
574 }
575
576 if (s->init) {
577 err = s->init(cam);
578 if (err) {
579 DBG(3, "Sensor initialization failed");
580 return err;
581 }
582 }
583
584 if ((err = zc0301_set_compression(cam, &cam->compression))) {
585 DBG(3, "set_compression() failed");
586 return err;
587 }
588
589 if (s->set_crop)
590 if ((err = s->set_crop(cam, rect))) {
591 DBG(3, "set_crop() failed");
592 return err;
593 }
594
595 if (s->set_ctrl) {
596 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
597 if (s->qctrl[i].id != 0 &&
598 !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
599 ctrl.id = s->qctrl[i].id;
600 ctrl.value = qctrl[i].default_value;
601 err = s->set_ctrl(cam, &ctrl);
602 if (err) {
603 DBG(3, "Set %s control failed",
604 s->qctrl[i].name);
605 return err;
606 }
607 DBG(3, "Image sensor supports '%s' control",
608 s->qctrl[i].name);
609 }
610 }
611
612 if (!(cam->state & DEV_INITIALIZED)) {
613 mutex_init(&cam->fileop_mutex);
614 spin_lock_init(&cam->queue_lock);
615 init_waitqueue_head(&cam->wait_frame);
616 init_waitqueue_head(&cam->wait_stream);
617 cam->nreadbuffers = 2;
618 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
619 memcpy(&(s->_rect), &(s->cropcap.defrect),
620 sizeof(struct v4l2_rect));
621 cam->state |= DEV_INITIALIZED;
622 }
623
624 DBG(2, "Initialization succeeded");
625 return 0;
626 }
627
628
629 static void zc0301_release_resources(struct zc0301_device* cam)
630 {
631 DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
632 video_set_drvdata(cam->v4ldev, NULL);
633 video_unregister_device(cam->v4ldev);
634 kfree(cam->control_buffer);
635 }
636
637 /*****************************************************************************/
638
639 static int zc0301_open(struct inode* inode, struct file* filp)
640 {
641 struct zc0301_device* cam;
642 int err = 0;
643
644 /*
645 This is the only safe way to prevent race conditions with
646 disconnect
647 */
648 if (!down_read_trylock(&zc0301_disconnect))
649 return -ERESTARTSYS;
650
651 cam = video_get_drvdata(video_devdata(filp));
652
653 if (mutex_lock_interruptible(&cam->dev_mutex)) {
654 up_read(&zc0301_disconnect);
655 return -ERESTARTSYS;
656 }
657
658 if (cam->users) {
659 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
660 if ((filp->f_flags & O_NONBLOCK) ||
661 (filp->f_flags & O_NDELAY)) {
662 err = -EWOULDBLOCK;
663 goto out;
664 }
665 mutex_unlock(&cam->dev_mutex);
666 err = wait_event_interruptible_exclusive(cam->open,
667 cam->state & DEV_DISCONNECTED
668 || !cam->users);
669 if (err) {
670 up_read(&zc0301_disconnect);
671 return err;
672 }
673 if (cam->state & DEV_DISCONNECTED) {
674 up_read(&zc0301_disconnect);
675 return -ENODEV;
676 }
677 mutex_lock(&cam->dev_mutex);
678 }
679
680
681 if (cam->state & DEV_MISCONFIGURED) {
682 err = zc0301_init(cam);
683 if (err) {
684 DBG(1, "Initialization failed again. "
685 "I will retry on next open().");
686 goto out;
687 }
688 cam->state &= ~DEV_MISCONFIGURED;
689 }
690
691 if ((err = zc0301_start_transfer(cam)))
692 goto out;
693
694 filp->private_data = cam;
695 cam->users++;
696 cam->io = IO_NONE;
697 cam->stream = STREAM_OFF;
698 cam->nbuffers = 0;
699 cam->frame_count = 0;
700 zc0301_empty_framequeues(cam);
701
702 DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
703
704 out:
705 mutex_unlock(&cam->dev_mutex);
706 up_read(&zc0301_disconnect);
707 return err;
708 }
709
710
711 static int zc0301_release(struct inode* inode, struct file* filp)
712 {
713 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
714
715 mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
716
717 zc0301_stop_transfer(cam);
718
719 zc0301_release_buffers(cam);
720
721 if (cam->state & DEV_DISCONNECTED) {
722 zc0301_release_resources(cam);
723 mutex_unlock(&cam->dev_mutex);
724 kfree(cam);
725 return 0;
726 }
727
728 cam->users--;
729 wake_up_interruptible_nr(&cam->open, 1);
730
731 DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
732
733 mutex_unlock(&cam->dev_mutex);
734
735 return 0;
736 }
737
738
739 static ssize_t
740 zc0301_read(struct file* filp, char __user * buf,
741 size_t count, loff_t* f_pos)
742 {
743 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
744 struct zc0301_frame_t* f, * i;
745 unsigned long lock_flags;
746 long timeout;
747 int err = 0;
748
749 if (mutex_lock_interruptible(&cam->fileop_mutex))
750 return -ERESTARTSYS;
751
752 if (cam->state & DEV_DISCONNECTED) {
753 DBG(1, "Device not present");
754 mutex_unlock(&cam->fileop_mutex);
755 return -ENODEV;
756 }
757
758 if (cam->state & DEV_MISCONFIGURED) {
759 DBG(1, "The camera is misconfigured. Close and open it "
760 "again.");
761 mutex_unlock(&cam->fileop_mutex);
762 return -EIO;
763 }
764
765 if (cam->io == IO_MMAP) {
766 DBG(3, "Close and open the device again to choose the read "
767 "method");
768 mutex_unlock(&cam->fileop_mutex);
769 return -EINVAL;
770 }
771
772 if (cam->io == IO_NONE) {
773 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
774 DBG(1, "read() failed, not enough memory");
775 mutex_unlock(&cam->fileop_mutex);
776 return -ENOMEM;
777 }
778 cam->io = IO_READ;
779 cam->stream = STREAM_ON;
780 }
781
782 if (list_empty(&cam->inqueue)) {
783 if (!list_empty(&cam->outqueue))
784 zc0301_empty_framequeues(cam);
785 zc0301_queue_unusedframes(cam);
786 }
787
788 if (!count) {
789 mutex_unlock(&cam->fileop_mutex);
790 return 0;
791 }
792
793 if (list_empty(&cam->outqueue)) {
794 if (filp->f_flags & O_NONBLOCK) {
795 mutex_unlock(&cam->fileop_mutex);
796 return -EAGAIN;
797 }
798 timeout = wait_event_interruptible_timeout
799 ( cam->wait_frame,
800 (!list_empty(&cam->outqueue)) ||
801 (cam->state & DEV_DISCONNECTED) ||
802 (cam->state & DEV_MISCONFIGURED),
803 ZC0301_FRAME_TIMEOUT );
804 if (timeout < 0) {
805 mutex_unlock(&cam->fileop_mutex);
806 return timeout;
807 }
808 if (cam->state & DEV_DISCONNECTED) {
809 mutex_unlock(&cam->fileop_mutex);
810 return -ENODEV;
811 }
812 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
813 mutex_unlock(&cam->fileop_mutex);
814 return -EIO;
815 }
816 }
817
818 f = list_entry(cam->outqueue.prev, struct zc0301_frame_t, frame);
819
820 if (count > f->buf.bytesused)
821 count = f->buf.bytesused;
822
823 if (copy_to_user(buf, f->bufmem, count)) {
824 err = -EFAULT;
825 goto exit;
826 }
827 *f_pos += count;
828
829 exit:
830 spin_lock_irqsave(&cam->queue_lock, lock_flags);
831 list_for_each_entry(i, &cam->outqueue, frame)
832 i->state = F_UNUSED;
833 INIT_LIST_HEAD(&cam->outqueue);
834 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
835
836 zc0301_queue_unusedframes(cam);
837
838 PDBGG("Frame #%lu, bytes read: %zu",
839 (unsigned long)f->buf.index, count);
840
841 mutex_unlock(&cam->fileop_mutex);
842
843 return err ? err : count;
844 }
845
846
847 static unsigned int zc0301_poll(struct file *filp, poll_table *wait)
848 {
849 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
850 struct zc0301_frame_t* f;
851 unsigned long lock_flags;
852 unsigned int mask = 0;
853
854 if (mutex_lock_interruptible(&cam->fileop_mutex))
855 return POLLERR;
856
857 if (cam->state & DEV_DISCONNECTED) {
858 DBG(1, "Device not present");
859 goto error;
860 }
861
862 if (cam->state & DEV_MISCONFIGURED) {
863 DBG(1, "The camera is misconfigured. Close and open it "
864 "again.");
865 goto error;
866 }
867
868 if (cam->io == IO_NONE) {
869 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
870 DBG(1, "poll() failed, not enough memory");
871 goto error;
872 }
873 cam->io = IO_READ;
874 cam->stream = STREAM_ON;
875 }
876
877 if (cam->io == IO_READ) {
878 spin_lock_irqsave(&cam->queue_lock, lock_flags);
879 list_for_each_entry(f, &cam->outqueue, frame)
880 f->state = F_UNUSED;
881 INIT_LIST_HEAD(&cam->outqueue);
882 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
883 zc0301_queue_unusedframes(cam);
884 }
885
886 poll_wait(filp, &cam->wait_frame, wait);
887
888 if (!list_empty(&cam->outqueue))
889 mask |= POLLIN | POLLRDNORM;
890
891 mutex_unlock(&cam->fileop_mutex);
892
893 return mask;
894
895 error:
896 mutex_unlock(&cam->fileop_mutex);
897 return POLLERR;
898 }
899
900
901 static void zc0301_vm_open(struct vm_area_struct* vma)
902 {
903 struct zc0301_frame_t* f = vma->vm_private_data;
904 f->vma_use_count++;
905 }
906
907
908 static void zc0301_vm_close(struct vm_area_struct* vma)
909 {
910 /* NOTE: buffers are not freed here */
911 struct zc0301_frame_t* f = vma->vm_private_data;
912 f->vma_use_count--;
913 }
914
915
916 static struct vm_operations_struct zc0301_vm_ops = {
917 .open = zc0301_vm_open,
918 .close = zc0301_vm_close,
919 };
920
921
922 static int zc0301_mmap(struct file* filp, struct vm_area_struct *vma)
923 {
924 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
925 unsigned long size = vma->vm_end - vma->vm_start,
926 start = vma->vm_start;
927 void *pos;
928 u32 i;
929
930 if (mutex_lock_interruptible(&cam->fileop_mutex))
931 return -ERESTARTSYS;
932
933 if (cam->state & DEV_DISCONNECTED) {
934 DBG(1, "Device not present");
935 mutex_unlock(&cam->fileop_mutex);
936 return -ENODEV;
937 }
938
939 if (cam->state & DEV_MISCONFIGURED) {
940 DBG(1, "The camera is misconfigured. Close and open it "
941 "again.");
942 mutex_unlock(&cam->fileop_mutex);
943 return -EIO;
944 }
945
946 if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
947 size != PAGE_ALIGN(cam->frame[0].buf.length)) {
948 mutex_unlock(&cam->fileop_mutex);
949 return -EINVAL;
950 }
951
952 for (i = 0; i < cam->nbuffers; i++) {
953 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
954 break;
955 }
956 if (i == cam->nbuffers) {
957 mutex_unlock(&cam->fileop_mutex);
958 return -EINVAL;
959 }
960
961 vma->vm_flags |= VM_IO;
962 vma->vm_flags |= VM_RESERVED;
963
964 pos = cam->frame[i].bufmem;
965 while (size > 0) { /* size is page-aligned */
966 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
967 mutex_unlock(&cam->fileop_mutex);
968 return -EAGAIN;
969 }
970 start += PAGE_SIZE;
971 pos += PAGE_SIZE;
972 size -= PAGE_SIZE;
973 }
974
975 vma->vm_ops = &zc0301_vm_ops;
976 vma->vm_private_data = &cam->frame[i];
977
978 zc0301_vm_open(vma);
979
980 mutex_unlock(&cam->fileop_mutex);
981
982 return 0;
983 }
984
985 /*****************************************************************************/
986
987 static int
988 zc0301_vidioc_querycap(struct zc0301_device* cam, void __user * arg)
989 {
990 struct v4l2_capability cap = {
991 .driver = "zc0301",
992 .version = ZC0301_MODULE_VERSION_CODE,
993 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
994 V4L2_CAP_STREAMING,
995 };
996
997 strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
998 if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
999 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
1000 sizeof(cap.bus_info));
1001
1002 if (copy_to_user(arg, &cap, sizeof(cap)))
1003 return -EFAULT;
1004
1005 return 0;
1006 }
1007
1008
1009 static int
1010 zc0301_vidioc_enuminput(struct zc0301_device* cam, void __user * arg)
1011 {
1012 struct v4l2_input i;
1013
1014 if (copy_from_user(&i, arg, sizeof(i)))
1015 return -EFAULT;
1016
1017 if (i.index)
1018 return -EINVAL;
1019
1020 memset(&i, 0, sizeof(i));
1021 strcpy(i.name, "Camera");
1022
1023 if (copy_to_user(arg, &i, sizeof(i)))
1024 return -EFAULT;
1025
1026 return 0;
1027 }
1028
1029
1030 static int
1031 zc0301_vidioc_gs_input(struct zc0301_device* cam, void __user * arg)
1032 {
1033 int index;
1034
1035 if (copy_from_user(&index, arg, sizeof(index)))
1036 return -EFAULT;
1037
1038 if (index != 0)
1039 return -EINVAL;
1040
1041 return 0;
1042 }
1043
1044
1045 static int
1046 zc0301_vidioc_query_ctrl(struct zc0301_device* cam, void __user * arg)
1047 {
1048 struct zc0301_sensor* s = cam->sensor;
1049 struct v4l2_queryctrl qc;
1050 u8 i;
1051
1052 if (copy_from_user(&qc, arg, sizeof(qc)))
1053 return -EFAULT;
1054
1055 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1056 if (qc.id && qc.id == s->qctrl[i].id) {
1057 memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1058 if (copy_to_user(arg, &qc, sizeof(qc)))
1059 return -EFAULT;
1060 return 0;
1061 }
1062
1063 return -EINVAL;
1064 }
1065
1066
1067 static int
1068 zc0301_vidioc_g_ctrl(struct zc0301_device* cam, void __user * arg)
1069 {
1070 struct zc0301_sensor* s = cam->sensor;
1071 struct v4l2_control ctrl;
1072 int err = 0;
1073 u8 i;
1074
1075 if (!s->get_ctrl && !s->set_ctrl)
1076 return -EINVAL;
1077
1078 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1079 return -EFAULT;
1080
1081 if (!s->get_ctrl) {
1082 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1083 if (ctrl.id == s->qctrl[i].id) {
1084 ctrl.value = s->_qctrl[i].default_value;
1085 goto exit;
1086 }
1087 return -EINVAL;
1088 } else
1089 err = s->get_ctrl(cam, &ctrl);
1090
1091 exit:
1092 if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1093 return -EFAULT;
1094
1095 return err;
1096 }
1097
1098
1099 static int
1100 zc0301_vidioc_s_ctrl(struct zc0301_device* cam, void __user * arg)
1101 {
1102 struct zc0301_sensor* s = cam->sensor;
1103 struct v4l2_control ctrl;
1104 u8 i;
1105 int err = 0;
1106
1107 if (!s->set_ctrl)
1108 return -EINVAL;
1109
1110 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1111 return -EFAULT;
1112
1113 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1114 if (ctrl.id == s->qctrl[i].id) {
1115 if (ctrl.value < s->qctrl[i].minimum ||
1116 ctrl.value > s->qctrl[i].maximum)
1117 return -ERANGE;
1118 ctrl.value -= ctrl.value % s->qctrl[i].step;
1119 break;
1120 }
1121
1122 if ((err = s->set_ctrl(cam, &ctrl)))
1123 return err;
1124
1125 s->_qctrl[i].default_value = ctrl.value;
1126
1127 return 0;
1128 }
1129
1130
1131 static int
1132 zc0301_vidioc_cropcap(struct zc0301_device* cam, void __user * arg)
1133 {
1134 struct v4l2_cropcap* cc = &(cam->sensor->cropcap);
1135
1136 cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1137 cc->pixelaspect.numerator = 1;
1138 cc->pixelaspect.denominator = 1;
1139
1140 if (copy_to_user(arg, cc, sizeof(*cc)))
1141 return -EFAULT;
1142
1143 return 0;
1144 }
1145
1146
1147 static int
1148 zc0301_vidioc_g_crop(struct zc0301_device* cam, void __user * arg)
1149 {
1150 struct zc0301_sensor* s = cam->sensor;
1151 struct v4l2_crop crop = {
1152 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1153 };
1154
1155 memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1156
1157 if (copy_to_user(arg, &crop, sizeof(crop)))
1158 return -EFAULT;
1159
1160 return 0;
1161 }
1162
1163
1164 static int
1165 zc0301_vidioc_s_crop(struct zc0301_device* cam, void __user * arg)
1166 {
1167 struct zc0301_sensor* s = cam->sensor;
1168 struct v4l2_crop crop;
1169 struct v4l2_rect* rect;
1170 struct v4l2_rect* bounds = &(s->cropcap.bounds);
1171 const enum zc0301_stream_state stream = cam->stream;
1172 const u32 nbuffers = cam->nbuffers;
1173 u32 i;
1174 int err = 0;
1175
1176 if (copy_from_user(&crop, arg, sizeof(crop)))
1177 return -EFAULT;
1178
1179 rect = &(crop.c);
1180
1181 if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1182 return -EINVAL;
1183
1184 if (cam->module_param.force_munmap)
1185 for (i = 0; i < cam->nbuffers; i++)
1186 if (cam->frame[i].vma_use_count) {
1187 DBG(3, "VIDIOC_S_CROP failed. "
1188 "Unmap the buffers first.");
1189 return -EINVAL;
1190 }
1191
1192 if (!s->set_crop) {
1193 memcpy(rect, &(s->_rect), sizeof(*rect));
1194 if (copy_to_user(arg, &crop, sizeof(crop)))
1195 return -EFAULT;
1196 return 0;
1197 }
1198
1199 rect->left &= ~7L;
1200 rect->top &= ~7L;
1201 if (rect->width < 8)
1202 rect->width = 8;
1203 if (rect->height < 8)
1204 rect->height = 8;
1205 if (rect->width > bounds->width)
1206 rect->width = bounds->width;
1207 if (rect->height > bounds->height)
1208 rect->height = bounds->height;
1209 if (rect->left < bounds->left)
1210 rect->left = bounds->left;
1211 if (rect->top < bounds->top)
1212 rect->top = bounds->top;
1213 if (rect->left + rect->width > bounds->left + bounds->width)
1214 rect->left = bounds->left+bounds->width - rect->width;
1215 if (rect->top + rect->height > bounds->top + bounds->height)
1216 rect->top = bounds->top+bounds->height - rect->height;
1217 rect->width &= ~7L;
1218 rect->height &= ~7L;
1219
1220 if (cam->stream == STREAM_ON)
1221 if ((err = zc0301_stream_interrupt(cam)))
1222 return err;
1223
1224 if (copy_to_user(arg, &crop, sizeof(crop))) {
1225 cam->stream = stream;
1226 return -EFAULT;
1227 }
1228
1229 if (cam->module_param.force_munmap || cam->io == IO_READ)
1230 zc0301_release_buffers(cam);
1231
1232 if (s->set_crop)
1233 err += s->set_crop(cam, rect);
1234
1235 if (err) { /* atomic, no rollback in ioctl() */
1236 cam->state |= DEV_MISCONFIGURED;
1237 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1238 "use the camera, close and open /dev/video%d again.",
1239 cam->v4ldev->minor);
1240 return -EIO;
1241 }
1242
1243 s->pix_format.width = rect->width;
1244 s->pix_format.height = rect->height;
1245 memcpy(&(s->_rect), rect, sizeof(*rect));
1246
1247 if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
1248 nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1249 cam->state |= DEV_MISCONFIGURED;
1250 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1251 "use the camera, close and open /dev/video%d again.",
1252 cam->v4ldev->minor);
1253 return -ENOMEM;
1254 }
1255
1256 if (cam->io == IO_READ)
1257 zc0301_empty_framequeues(cam);
1258 else if (cam->module_param.force_munmap)
1259 zc0301_requeue_outqueue(cam);
1260
1261 cam->stream = stream;
1262
1263 return 0;
1264 }
1265
1266
1267 static int
1268 zc0301_vidioc_enum_fmt(struct zc0301_device* cam, void __user * arg)
1269 {
1270 struct v4l2_fmtdesc fmtd;
1271
1272 if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1273 return -EFAULT;
1274
1275 if (fmtd.index == 0) {
1276 strcpy(fmtd.description, "JPEG");
1277 fmtd.pixelformat = V4L2_PIX_FMT_JPEG;
1278 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1279 } else
1280 return -EINVAL;
1281
1282 fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1283 memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1284
1285 if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1286 return -EFAULT;
1287
1288 return 0;
1289 }
1290
1291
1292 static int
1293 zc0301_vidioc_g_fmt(struct zc0301_device* cam, void __user * arg)
1294 {
1295 struct v4l2_format format;
1296 struct v4l2_pix_format* pfmt = &(cam->sensor->pix_format);
1297
1298 if (copy_from_user(&format, arg, sizeof(format)))
1299 return -EFAULT;
1300
1301 if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1302 return -EINVAL;
1303
1304 pfmt->bytesperline = 0;
1305 pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1306 pfmt->field = V4L2_FIELD_NONE;
1307 memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1308
1309 if (copy_to_user(arg, &format, sizeof(format)))
1310 return -EFAULT;
1311
1312 return 0;
1313 }
1314
1315
1316 static int
1317 zc0301_vidioc_try_s_fmt(struct zc0301_device* cam, unsigned int cmd,
1318 void __user * arg)
1319 {
1320 struct zc0301_sensor* s = cam->sensor;
1321 struct v4l2_format format;
1322 struct v4l2_pix_format* pix;
1323 struct v4l2_pix_format* pfmt = &(s->pix_format);
1324 struct v4l2_rect* bounds = &(s->cropcap.bounds);
1325 struct v4l2_rect rect;
1326 const enum zc0301_stream_state stream = cam->stream;
1327 const u32 nbuffers = cam->nbuffers;
1328 u32 i;
1329 int err = 0;
1330
1331 if (copy_from_user(&format, arg, sizeof(format)))
1332 return -EFAULT;
1333
1334 pix = &(format.fmt.pix);
1335
1336 if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1337 return -EINVAL;
1338
1339 memcpy(&rect, &(s->_rect), sizeof(rect));
1340
1341 if (!s->set_crop) {
1342 pix->width = rect.width;
1343 pix->height = rect.height;
1344 } else {
1345 rect.width = pix->width;
1346 rect.height = pix->height;
1347 }
1348
1349 if (rect.width < 8)
1350 rect.width = 8;
1351 if (rect.height < 8)
1352 rect.height = 8;
1353 if (rect.width > bounds->left + bounds->width - rect.left)
1354 rect.width = bounds->left + bounds->width - rect.left;
1355 if (rect.height > bounds->top + bounds->height - rect.top)
1356 rect.height = bounds->top + bounds->height - rect.top;
1357 rect.width &= ~7L;
1358 rect.height &= ~7L;
1359
1360 pix->width = rect.width;
1361 pix->height = rect.height;
1362 pix->pixelformat = pfmt->pixelformat;
1363 pix->priv = pfmt->priv;
1364 pix->colorspace = pfmt->colorspace;
1365 pix->bytesperline = 0;
1366 pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
1367 pix->field = V4L2_FIELD_NONE;
1368
1369 if (cmd == VIDIOC_TRY_FMT) {
1370 if (copy_to_user(arg, &format, sizeof(format)))
1371 return -EFAULT;
1372 return 0;
1373 }
1374
1375 if (cam->module_param.force_munmap)
1376 for (i = 0; i < cam->nbuffers; i++)
1377 if (cam->frame[i].vma_use_count) {
1378 DBG(3, "VIDIOC_S_FMT failed. "
1379 "Unmap the buffers first.");
1380 return -EINVAL;
1381 }
1382
1383 if (cam->stream == STREAM_ON)
1384 if ((err = zc0301_stream_interrupt(cam)))
1385 return err;
1386
1387 if (copy_to_user(arg, &format, sizeof(format))) {
1388 cam->stream = stream;
1389 return -EFAULT;
1390 }
1391
1392 if (cam->module_param.force_munmap || cam->io == IO_READ)
1393 zc0301_release_buffers(cam);
1394
1395 if (s->set_crop)
1396 err += s->set_crop(cam, &rect);
1397
1398 if (err) { /* atomic, no rollback in ioctl() */
1399 cam->state |= DEV_MISCONFIGURED;
1400 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
1401 "use the camera, close and open /dev/video%d again.",
1402 cam->v4ldev->minor);
1403 return -EIO;
1404 }
1405
1406 memcpy(pfmt, pix, sizeof(*pix));
1407 memcpy(&(s->_rect), &rect, sizeof(rect));
1408
1409 if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
1410 nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1411 cam->state |= DEV_MISCONFIGURED;
1412 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
1413 "use the camera, close and open /dev/video%d again.",
1414 cam->v4ldev->minor);
1415 return -ENOMEM;
1416 }
1417
1418 if (cam->io == IO_READ)
1419 zc0301_empty_framequeues(cam);
1420 else if (cam->module_param.force_munmap)
1421 zc0301_requeue_outqueue(cam);
1422
1423 cam->stream = stream;
1424
1425 return 0;
1426 }
1427
1428
1429 static int
1430 zc0301_vidioc_g_jpegcomp(struct zc0301_device* cam, void __user * arg)
1431 {
1432 if (copy_to_user(arg, &cam->compression, sizeof(cam->compression)))
1433 return -EFAULT;
1434
1435 return 0;
1436 }
1437
1438
1439 static int
1440 zc0301_vidioc_s_jpegcomp(struct zc0301_device* cam, void __user * arg)
1441 {
1442 struct v4l2_jpegcompression jc;
1443 const enum zc0301_stream_state stream = cam->stream;
1444 int err = 0;
1445
1446 if (copy_from_user(&jc, arg, sizeof(jc)))
1447 return -EFAULT;
1448
1449 if (jc.quality < 0 || jc.quality > 3)
1450 return -EINVAL;
1451
1452 if (cam->stream == STREAM_ON)
1453 if ((err = zc0301_stream_interrupt(cam)))
1454 return err;
1455
1456 err += zc0301_set_compression(cam, &jc);
1457 if (err) { /* atomic, no rollback in ioctl() */
1458 cam->state |= DEV_MISCONFIGURED;
1459 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
1460 "problems. To use the camera, close and open "
1461 "/dev/video%d again.", cam->v4ldev->minor);
1462 return -EIO;
1463 }
1464
1465 cam->compression.quality = jc.quality;
1466
1467 cam->stream = stream;
1468
1469 return 0;
1470 }
1471
1472
1473 static int
1474 zc0301_vidioc_reqbufs(struct zc0301_device* cam, void __user * arg)
1475 {
1476 struct v4l2_requestbuffers rb;
1477 u32 i;
1478 int err;
1479
1480 if (copy_from_user(&rb, arg, sizeof(rb)))
1481 return -EFAULT;
1482
1483 if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1484 rb.memory != V4L2_MEMORY_MMAP)
1485 return -EINVAL;
1486
1487 if (cam->io == IO_READ) {
1488 DBG(3, "Close and open the device again to choose the mmap "
1489 "I/O method");
1490 return -EINVAL;
1491 }
1492
1493 for (i = 0; i < cam->nbuffers; i++)
1494 if (cam->frame[i].vma_use_count) {
1495 DBG(3, "VIDIOC_REQBUFS failed. "
1496 "Previous buffers are still mapped.");
1497 return -EINVAL;
1498 }
1499
1500 if (cam->stream == STREAM_ON)
1501 if ((err = zc0301_stream_interrupt(cam)))
1502 return err;
1503
1504 zc0301_empty_framequeues(cam);
1505
1506 zc0301_release_buffers(cam);
1507 if (rb.count)
1508 rb.count = zc0301_request_buffers(cam, rb.count, IO_MMAP);
1509
1510 if (copy_to_user(arg, &rb, sizeof(rb))) {
1511 zc0301_release_buffers(cam);
1512 cam->io = IO_NONE;
1513 return -EFAULT;
1514 }
1515
1516 cam->io = rb.count ? IO_MMAP : IO_NONE;
1517
1518 return 0;
1519 }
1520
1521
1522 static int
1523 zc0301_vidioc_querybuf(struct zc0301_device* cam, void __user * arg)
1524 {
1525 struct v4l2_buffer b;
1526
1527 if (copy_from_user(&b, arg, sizeof(b)))
1528 return -EFAULT;
1529
1530 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1531 b.index >= cam->nbuffers || cam->io != IO_MMAP)
1532 return -EINVAL;
1533
1534 memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
1535
1536 if (cam->frame[b.index].vma_use_count)
1537 b.flags |= V4L2_BUF_FLAG_MAPPED;
1538
1539 if (cam->frame[b.index].state == F_DONE)
1540 b.flags |= V4L2_BUF_FLAG_DONE;
1541 else if (cam->frame[b.index].state != F_UNUSED)
1542 b.flags |= V4L2_BUF_FLAG_QUEUED;
1543
1544 if (copy_to_user(arg, &b, sizeof(b)))
1545 return -EFAULT;
1546
1547 return 0;
1548 }
1549
1550
1551 static int
1552 zc0301_vidioc_qbuf(struct zc0301_device* cam, void __user * arg)
1553 {
1554 struct v4l2_buffer b;
1555 unsigned long lock_flags;
1556
1557 if (copy_from_user(&b, arg, sizeof(b)))
1558 return -EFAULT;
1559
1560 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1561 b.index >= cam->nbuffers || cam->io != IO_MMAP)
1562 return -EINVAL;
1563
1564 if (cam->frame[b.index].state != F_UNUSED)
1565 return -EINVAL;
1566
1567 cam->frame[b.index].state = F_QUEUED;
1568
1569 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1570 list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
1571 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1572
1573 PDBGG("Frame #%lu queued", (unsigned long)b.index);
1574
1575 return 0;
1576 }
1577
1578
1579 static int
1580 zc0301_vidioc_dqbuf(struct zc0301_device* cam, struct file* filp,
1581 void __user * arg)
1582 {
1583 struct v4l2_buffer b;
1584 struct zc0301_frame_t *f;
1585 unsigned long lock_flags;
1586 long timeout;
1587
1588 if (copy_from_user(&b, arg, sizeof(b)))
1589 return -EFAULT;
1590
1591 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
1592 return -EINVAL;
1593
1594 if (list_empty(&cam->outqueue)) {
1595 if (cam->stream == STREAM_OFF)
1596 return -EINVAL;
1597 if (filp->f_flags & O_NONBLOCK)
1598 return -EAGAIN;
1599 timeout = wait_event_interruptible_timeout
1600 ( cam->wait_frame,
1601 (!list_empty(&cam->outqueue)) ||
1602 (cam->state & DEV_DISCONNECTED) ||
1603 (cam->state & DEV_MISCONFIGURED),
1604 ZC0301_FRAME_TIMEOUT );
1605 if (timeout < 0)
1606 return timeout;
1607 if (cam->state & DEV_DISCONNECTED)
1608 return -ENODEV;
1609 if (!timeout || (cam->state & DEV_MISCONFIGURED))
1610 return -EIO;
1611 }
1612
1613 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1614 f = list_entry(cam->outqueue.next, struct zc0301_frame_t, frame);
1615 list_del(cam->outqueue.next);
1616 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1617
1618 f->state = F_UNUSED;
1619
1620 memcpy(&b, &f->buf, sizeof(b));
1621 if (f->vma_use_count)
1622 b.flags |= V4L2_BUF_FLAG_MAPPED;
1623
1624 if (copy_to_user(arg, &b, sizeof(b)))
1625 return -EFAULT;
1626
1627 PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
1628
1629 return 0;
1630 }
1631
1632
1633 static int
1634 zc0301_vidioc_streamon(struct zc0301_device* cam, void __user * arg)
1635 {
1636 int type;
1637
1638 if (copy_from_user(&type, arg, sizeof(type)))
1639 return -EFAULT;
1640
1641 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1642 return -EINVAL;
1643
1644 if (list_empty(&cam->inqueue))
1645 return -EINVAL;
1646
1647 cam->stream = STREAM_ON;
1648
1649 DBG(3, "Stream on");
1650
1651 return 0;
1652 }
1653
1654
1655 static int
1656 zc0301_vidioc_streamoff(struct zc0301_device* cam, void __user * arg)
1657 {
1658 int type, err;
1659
1660 if (copy_from_user(&type, arg, sizeof(type)))
1661 return -EFAULT;
1662
1663 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1664 return -EINVAL;
1665
1666 if (cam->stream == STREAM_ON)
1667 if ((err = zc0301_stream_interrupt(cam)))
1668 return err;
1669
1670 zc0301_empty_framequeues(cam);
1671
1672 DBG(3, "Stream off");
1673
1674 return 0;
1675 }
1676
1677
1678 static int
1679 zc0301_vidioc_g_parm(struct zc0301_device* cam, void __user * arg)
1680 {
1681 struct v4l2_streamparm sp;
1682
1683 if (copy_from_user(&sp, arg, sizeof(sp)))
1684 return -EFAULT;
1685
1686 if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1687 return -EINVAL;
1688
1689 sp.parm.capture.extendedmode = 0;
1690 sp.parm.capture.readbuffers = cam->nreadbuffers;
1691
1692 if (copy_to_user(arg, &sp, sizeof(sp)))
1693 return -EFAULT;
1694
1695 return 0;
1696 }
1697
1698
1699 static int
1700 zc0301_vidioc_s_parm(struct zc0301_device* cam, void __user * arg)
1701 {
1702 struct v4l2_streamparm sp;
1703
1704 if (copy_from_user(&sp, arg, sizeof(sp)))
1705 return -EFAULT;
1706
1707 if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1708 return -EINVAL;
1709
1710 sp.parm.capture.extendedmode = 0;
1711
1712 if (sp.parm.capture.readbuffers == 0)
1713 sp.parm.capture.readbuffers = cam->nreadbuffers;
1714
1715 if (sp.parm.capture.readbuffers > ZC0301_MAX_FRAMES)
1716 sp.parm.capture.readbuffers = ZC0301_MAX_FRAMES;
1717
1718 if (copy_to_user(arg, &sp, sizeof(sp)))
1719 return -EFAULT;
1720
1721 cam->nreadbuffers = sp.parm.capture.readbuffers;
1722
1723 return 0;
1724 }
1725
1726
1727 static int zc0301_ioctl_v4l2(struct inode* inode, struct file* filp,
1728 unsigned int cmd, void __user * arg)
1729 {
1730 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
1731
1732 switch (cmd) {
1733
1734 case VIDIOC_QUERYCAP:
1735 return zc0301_vidioc_querycap(cam, arg);
1736
1737 case VIDIOC_ENUMINPUT:
1738 return zc0301_vidioc_enuminput(cam, arg);
1739
1740 case VIDIOC_G_INPUT:
1741 case VIDIOC_S_INPUT:
1742 return zc0301_vidioc_gs_input(cam, arg);
1743
1744 case VIDIOC_QUERYCTRL:
1745 return zc0301_vidioc_query_ctrl(cam, arg);
1746
1747 case VIDIOC_G_CTRL:
1748 return zc0301_vidioc_g_ctrl(cam, arg);
1749
1750 case VIDIOC_S_CTRL_OLD:
1751 case VIDIOC_S_CTRL:
1752 return zc0301_vidioc_s_ctrl(cam, arg);
1753
1754 case VIDIOC_CROPCAP_OLD:
1755 case VIDIOC_CROPCAP:
1756 return zc0301_vidioc_cropcap(cam, arg);
1757
1758 case VIDIOC_G_CROP:
1759 return zc0301_vidioc_g_crop(cam, arg);
1760
1761 case VIDIOC_S_CROP:
1762 return zc0301_vidioc_s_crop(cam, arg);
1763
1764 case VIDIOC_ENUM_FMT:
1765 return zc0301_vidioc_enum_fmt(cam, arg);
1766
1767 case VIDIOC_G_FMT:
1768 return zc0301_vidioc_g_fmt(cam, arg);
1769
1770 case VIDIOC_TRY_FMT:
1771 case VIDIOC_S_FMT:
1772 return zc0301_vidioc_try_s_fmt(cam, cmd, arg);
1773
1774 case VIDIOC_G_JPEGCOMP:
1775 return zc0301_vidioc_g_jpegcomp(cam, arg);
1776
1777 case VIDIOC_S_JPEGCOMP:
1778 return zc0301_vidioc_s_jpegcomp(cam, arg);
1779
1780 case VIDIOC_REQBUFS:
1781 return zc0301_vidioc_reqbufs(cam, arg);
1782
1783 case VIDIOC_QUERYBUF:
1784 return zc0301_vidioc_querybuf(cam, arg);
1785
1786 case VIDIOC_QBUF:
1787 return zc0301_vidioc_qbuf(cam, arg);
1788
1789 case VIDIOC_DQBUF:
1790 return zc0301_vidioc_dqbuf(cam, filp, arg);
1791
1792 case VIDIOC_STREAMON:
1793 return zc0301_vidioc_streamon(cam, arg);
1794
1795 case VIDIOC_STREAMOFF:
1796 return zc0301_vidioc_streamoff(cam, arg);
1797
1798 case VIDIOC_G_PARM:
1799 return zc0301_vidioc_g_parm(cam, arg);
1800
1801 case VIDIOC_S_PARM_OLD:
1802 case VIDIOC_S_PARM:
1803 return zc0301_vidioc_s_parm(cam, arg);
1804
1805 case VIDIOC_G_STD:
1806 case VIDIOC_S_STD:
1807 case VIDIOC_QUERYSTD:
1808 case VIDIOC_ENUMSTD:
1809 case VIDIOC_QUERYMENU:
1810 return -EINVAL;
1811
1812 default:
1813 return -EINVAL;
1814
1815 }
1816 }
1817
1818
1819 static int zc0301_ioctl(struct inode* inode, struct file* filp,
1820 unsigned int cmd, unsigned long arg)
1821 {
1822 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
1823 int err = 0;
1824
1825 if (mutex_lock_interruptible(&cam->fileop_mutex))
1826 return -ERESTARTSYS;
1827
1828 if (cam->state & DEV_DISCONNECTED) {
1829 DBG(1, "Device not present");
1830 mutex_unlock(&cam->fileop_mutex);
1831 return -ENODEV;
1832 }
1833
1834 if (cam->state & DEV_MISCONFIGURED) {
1835 DBG(1, "The camera is misconfigured. Close and open it "
1836 "again.");
1837 mutex_unlock(&cam->fileop_mutex);
1838 return -EIO;
1839 }
1840
1841 V4LDBG(3, "zc0301", cmd);
1842
1843 err = zc0301_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
1844
1845 mutex_unlock(&cam->fileop_mutex);
1846
1847 return err;
1848 }
1849
1850
1851 static struct file_operations zc0301_fops = {
1852 .owner = THIS_MODULE,
1853 .open = zc0301_open,
1854 .release = zc0301_release,
1855 .ioctl = zc0301_ioctl,
1856 .read = zc0301_read,
1857 .poll = zc0301_poll,
1858 .mmap = zc0301_mmap,
1859 .llseek = no_llseek,
1860 };
1861
1862 /*****************************************************************************/
1863
1864 static int
1865 zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
1866 {
1867 struct usb_device *udev = interface_to_usbdev(intf);
1868 struct zc0301_device* cam;
1869 static unsigned int dev_nr = 0;
1870 unsigned int i;
1871 int err = 0;
1872
1873 if (!(cam = kzalloc(sizeof(struct zc0301_device), GFP_KERNEL)))
1874 return -ENOMEM;
1875
1876 cam->usbdev = udev;
1877
1878 if (!(cam->control_buffer = kzalloc(4, GFP_KERNEL))) {
1879 DBG(1, "kmalloc() failed");
1880 err = -ENOMEM;
1881 goto fail;
1882 }
1883
1884 if (!(cam->v4ldev = video_device_alloc())) {
1885 DBG(1, "video_device_alloc() failed");
1886 err = -ENOMEM;
1887 goto fail;
1888 }
1889
1890 mutex_init(&cam->dev_mutex);
1891
1892 DBG(2, "ZC0301 Image Processor and Control Chip detected "
1893 "(vid/pid 0x%04X/0x%04X)",id->idVendor, id->idProduct);
1894
1895 for (i = 0; zc0301_sensor_table[i]; i++) {
1896 err = zc0301_sensor_table[i](cam);
1897 if (!err)
1898 break;
1899 }
1900
1901 if (!err && cam->sensor)
1902 DBG(2, "%s image sensor detected", cam->sensor->name);
1903 else {
1904 DBG(1, "No supported image sensor detected");
1905 err = -ENODEV;
1906 goto fail;
1907 }
1908
1909 if (zc0301_init(cam)) {
1910 DBG(1, "Initialization failed. I will retry on open().");
1911 cam->state |= DEV_MISCONFIGURED;
1912 }
1913
1914 strcpy(cam->v4ldev->name, "ZC0301 PC Camera");
1915 cam->v4ldev->owner = THIS_MODULE;
1916 cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
1917 cam->v4ldev->hardware = 0;
1918 cam->v4ldev->fops = &zc0301_fops;
1919 cam->v4ldev->minor = video_nr[dev_nr];
1920 cam->v4ldev->release = video_device_release;
1921 video_set_drvdata(cam->v4ldev, cam);
1922
1923 mutex_lock(&cam->dev_mutex);
1924
1925 err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
1926 video_nr[dev_nr]);
1927 if (err) {
1928 DBG(1, "V4L2 device registration failed");
1929 if (err == -ENFILE && video_nr[dev_nr] == -1)
1930 DBG(1, "Free /dev/videoX node not found");
1931 video_nr[dev_nr] = -1;
1932 dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
1933 mutex_unlock(&cam->dev_mutex);
1934 goto fail;
1935 }
1936
1937 DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
1938
1939 cam->module_param.force_munmap = force_munmap[dev_nr];
1940
1941 dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
1942
1943 usb_set_intfdata(intf, cam);
1944
1945 mutex_unlock(&cam->dev_mutex);
1946
1947 return 0;
1948
1949 fail:
1950 if (cam) {
1951 kfree(cam->control_buffer);
1952 if (cam->v4ldev)
1953 video_device_release(cam->v4ldev);
1954 kfree(cam);
1955 }
1956 return err;
1957 }
1958
1959
1960 static void zc0301_usb_disconnect(struct usb_interface* intf)
1961 {
1962 struct zc0301_device* cam = usb_get_intfdata(intf);
1963
1964 if (!cam)
1965 return;
1966
1967 down_write(&zc0301_disconnect);
1968
1969 mutex_lock(&cam->dev_mutex);
1970
1971 DBG(2, "Disconnecting %s...", cam->v4ldev->name);
1972
1973 wake_up_interruptible_all(&cam->open);
1974
1975 if (cam->users) {
1976 DBG(2, "Device /dev/video%d is open! Deregistration and "
1977 "memory deallocation are deferred on close.",
1978 cam->v4ldev->minor);
1979 cam->state |= DEV_MISCONFIGURED;
1980 zc0301_stop_transfer(cam);
1981 cam->state |= DEV_DISCONNECTED;
1982 wake_up_interruptible(&cam->wait_frame);
1983 wake_up_interruptible(&cam->wait_stream);
1984 } else {
1985 cam->state |= DEV_DISCONNECTED;
1986 zc0301_release_resources(cam);
1987 }
1988
1989 mutex_unlock(&cam->dev_mutex);
1990
1991 if (!cam->users)
1992 kfree(cam);
1993
1994 up_write(&zc0301_disconnect);
1995 }
1996
1997
1998 static struct usb_driver zc0301_usb_driver = {
1999 .name = "zc0301",
2000 .id_table = zc0301_id_table,
2001 .probe = zc0301_usb_probe,
2002 .disconnect = zc0301_usb_disconnect,
2003 };
2004
2005 /*****************************************************************************/
2006
2007 static int __init zc0301_module_init(void)
2008 {
2009 int err = 0;
2010
2011 KDBG(2, ZC0301_MODULE_NAME " v" ZC0301_MODULE_VERSION);
2012 KDBG(3, ZC0301_MODULE_AUTHOR);
2013
2014 if ((err = usb_register(&zc0301_usb_driver)))
2015 KDBG(1, "usb_register() failed");
2016
2017 return err;
2018 }
2019
2020
2021 static void __exit zc0301_module_exit(void)
2022 {
2023 usb_deregister(&zc0301_usb_driver);
2024 }
2025
2026
2027 module_init(zc0301_module_init);
2028 module_exit(zc0301_module_exit);
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