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V4L/DVB (3599a): Move drivers/usb/media to drivers/media/video
[mirror_ubuntu-zesty-kernel.git] / drivers / media / video / zc0301 / zc0301_core.c
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 needed to enable the I2C protocol *
7 * have been taken from the documentation of the ZC030x Video4Linux1 *
8 * driver 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/device.h>
33 #include <linux/fs.h>
34 #include <linux/delay.h>
35 #include <linux/compiler.h>
36 #include <linux/ioctl.h>
37 #include <linux/poll.h>
38 #include <linux/stat.h>
39 #include <linux/mm.h>
40 #include <linux/vmalloc.h>
41 #include <linux/page-flags.h>
42 #include <linux/byteorder/generic.h>
43 #include <asm/page.h>
44 #include <asm/uaccess.h>
45
46 #include "zc0301.h"
47
48 /*****************************************************************************/
49
50 #define ZC0301_MODULE_NAME "V4L2 driver for ZC0301 " \
51 "Image Processor and Control Chip"
52 #define ZC0301_MODULE_AUTHOR "(C) 2006 Luca Risolia"
53 #define ZC0301_AUTHOR_EMAIL "<luca.risolia@studio.unibo.it>"
54 #define ZC0301_MODULE_LICENSE "GPL"
55 #define ZC0301_MODULE_VERSION "1:1.03"
56 #define ZC0301_MODULE_VERSION_CODE KERNEL_VERSION(1, 0, 3)
57
58 /*****************************************************************************/
59
60 MODULE_DEVICE_TABLE(usb, zc0301_id_table);
61
62 MODULE_AUTHOR(ZC0301_MODULE_AUTHOR " " ZC0301_AUTHOR_EMAIL);
63 MODULE_DESCRIPTION(ZC0301_MODULE_NAME);
64 MODULE_VERSION(ZC0301_MODULE_VERSION);
65 MODULE_LICENSE(ZC0301_MODULE_LICENSE);
66
67 static short video_nr[] = {[0 ... ZC0301_MAX_DEVICES-1] = -1};
68 module_param_array(video_nr, short, NULL, 0444);
69 MODULE_PARM_DESC(video_nr,
70 "\n<-1|n[,...]> Specify V4L2 minor mode number."
71 "\n -1 = use next available (default)"
72 "\n n = use minor number n (integer >= 0)"
73 "\nYou can specify up to "
74 __MODULE_STRING(ZC0301_MAX_DEVICES) " cameras this way."
75 "\nFor example:"
76 "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
77 "\nthe second registered camera and use auto for the first"
78 "\none and for every other camera."
79 "\n");
80
81 static short force_munmap[] = {[0 ... ZC0301_MAX_DEVICES-1] =
82 ZC0301_FORCE_MUNMAP};
83 module_param_array(force_munmap, bool, NULL, 0444);
84 MODULE_PARM_DESC(force_munmap,
85 "\n<0|1[,...]> Force the application to unmap previously"
86 "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
87 "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
88 "\nthis feature. This parameter is specific for each"
89 "\ndetected camera."
90 "\n 0 = do not force memory unmapping"
91 "\n 1 = force memory unmapping (save memory)"
92 "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
93 "\n");
94
95 static unsigned int frame_timeout[] = {[0 ... ZC0301_MAX_DEVICES-1] =
96 ZC0301_FRAME_TIMEOUT};
97 module_param_array(frame_timeout, uint, NULL, 0644);
98 MODULE_PARM_DESC(frame_timeout,
99 "\n<n[,...]> Timeout for a video frame in seconds."
100 "\nThis parameter is specific for each detected camera."
101 "\nDefault value is "__MODULE_STRING(ZC0301_FRAME_TIMEOUT)"."
102 "\n");
103
104 #ifdef ZC0301_DEBUG
105 static unsigned short debug = ZC0301_DEBUG_LEVEL;
106 module_param(debug, ushort, 0644);
107 MODULE_PARM_DESC(debug,
108 "\n<n> Debugging information level, from 0 to 3:"
109 "\n0 = none (use carefully)"
110 "\n1 = critical errors"
111 "\n2 = significant informations"
112 "\n3 = more verbose messages"
113 "\nLevel 3 is useful for testing only, when only "
114 "one device is used."
115 "\nDefault value is "__MODULE_STRING(ZC0301_DEBUG_LEVEL)"."
116 "\n");
117 #endif
118
119 /*****************************************************************************/
120
121 static u32
122 zc0301_request_buffers(struct zc0301_device* cam, u32 count,
123 enum zc0301_io_method io)
124 {
125 struct v4l2_pix_format* p = &(cam->sensor.pix_format);
126 struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
127 const size_t imagesize = cam->module_param.force_munmap ||
128 io == IO_READ ?
129 (p->width * p->height * p->priv) / 8 :
130 (r->width * r->height * p->priv) / 8;
131 void* buff = NULL;
132 u32 i;
133
134 if (count > ZC0301_MAX_FRAMES)
135 count = ZC0301_MAX_FRAMES;
136
137 cam->nbuffers = count;
138 while (cam->nbuffers > 0) {
139 if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
140 break;
141 cam->nbuffers--;
142 }
143
144 for (i = 0; i < cam->nbuffers; i++) {
145 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
146 cam->frame[i].buf.index = i;
147 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
148 cam->frame[i].buf.length = imagesize;
149 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
150 cam->frame[i].buf.sequence = 0;
151 cam->frame[i].buf.field = V4L2_FIELD_NONE;
152 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
153 cam->frame[i].buf.flags = 0;
154 }
155
156 return cam->nbuffers;
157 }
158
159
160 static void zc0301_release_buffers(struct zc0301_device* cam)
161 {
162 if (cam->nbuffers) {
163 vfree(cam->frame[0].bufmem);
164 cam->nbuffers = 0;
165 }
166 cam->frame_current = NULL;
167 }
168
169
170 static void zc0301_empty_framequeues(struct zc0301_device* cam)
171 {
172 u32 i;
173
174 INIT_LIST_HEAD(&cam->inqueue);
175 INIT_LIST_HEAD(&cam->outqueue);
176
177 for (i = 0; i < ZC0301_MAX_FRAMES; i++) {
178 cam->frame[i].state = F_UNUSED;
179 cam->frame[i].buf.bytesused = 0;
180 }
181 }
182
183
184 static void zc0301_requeue_outqueue(struct zc0301_device* cam)
185 {
186 struct zc0301_frame_t *i;
187
188 list_for_each_entry(i, &cam->outqueue, frame) {
189 i->state = F_QUEUED;
190 list_add(&i->frame, &cam->inqueue);
191 }
192
193 INIT_LIST_HEAD(&cam->outqueue);
194 }
195
196
197 static void zc0301_queue_unusedframes(struct zc0301_device* cam)
198 {
199 unsigned long lock_flags;
200 u32 i;
201
202 for (i = 0; i < cam->nbuffers; i++)
203 if (cam->frame[i].state == F_UNUSED) {
204 cam->frame[i].state = F_QUEUED;
205 spin_lock_irqsave(&cam->queue_lock, lock_flags);
206 list_add_tail(&cam->frame[i].frame, &cam->inqueue);
207 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
208 }
209 }
210
211 /*****************************************************************************/
212
213 int zc0301_write_reg(struct zc0301_device* cam, u16 index, u16 value)
214 {
215 struct usb_device* udev = cam->usbdev;
216 int res;
217
218 res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0xa0, 0x40,
219 value, index, NULL, 0, ZC0301_CTRL_TIMEOUT);
220 if (res < 0) {
221 DBG(3, "Failed to write a register (index 0x%04X, "
222 "value 0x%02X, error %d)",index, value, res);
223 return -1;
224 }
225
226 return 0;
227 }
228
229
230 int zc0301_read_reg(struct zc0301_device* cam, u16 index)
231 {
232 struct usb_device* udev = cam->usbdev;
233 u8* buff = cam->control_buffer;
234 int res;
235
236 res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0xa1, 0xc0,
237 0x0001, index, buff, 1, ZC0301_CTRL_TIMEOUT);
238 if (res < 0)
239 DBG(3, "Failed to read a register (index 0x%04X, error %d)",
240 index, res);
241
242 PDBGG("Read: index 0x%04X, value: 0x%04X", index, (int)(*buff));
243
244 return (res >= 0) ? (int)(*buff) : -1;
245 }
246
247
248 int zc0301_i2c_read(struct zc0301_device* cam, u16 address, u8 length)
249 {
250 int err = 0, res, r0, r1;
251
252 err += zc0301_write_reg(cam, 0x0092, address);
253 err += zc0301_write_reg(cam, 0x0090, 0x02);
254
255 msleep(1);
256
257 res = zc0301_read_reg(cam, 0x0091);
258 if (res < 0)
259 err += res;
260 r0 = zc0301_read_reg(cam, 0x0095);
261 if (r0 < 0)
262 err += r0;
263 r1 = zc0301_read_reg(cam, 0x0096);
264 if (r1 < 0)
265 err += r1;
266
267 res = (length <= 1) ? r0 : r0 | (r1 << 8);
268
269 if (err)
270 DBG(3, "I2C read failed at address 0x%04X, value: 0x%04X",
271 address, res);
272
273
274 PDBGG("I2C read: address 0x%04X, value: 0x%04X", address, res);
275
276 return err ? -1 : res;
277 }
278
279
280 int zc0301_i2c_write(struct zc0301_device* cam, u16 address, u16 value)
281 {
282 int err = 0, res;
283
284 err += zc0301_write_reg(cam, 0x0092, address);
285 err += zc0301_write_reg(cam, 0x0093, value & 0xff);
286 err += zc0301_write_reg(cam, 0x0094, value >> 8);
287 err += zc0301_write_reg(cam, 0x0090, 0x01);
288
289 msleep(1);
290
291 res = zc0301_read_reg(cam, 0x0091);
292 if (res < 0)
293 err += res;
294
295 if (err)
296 DBG(3, "I2C write failed at address 0x%04X, value: 0x%04X",
297 address, value);
298
299 PDBGG("I2C write: address 0x%04X, value: 0x%04X", address, value);
300
301 return err ? -1 : 0;
302 }
303
304 /*****************************************************************************/
305
306 static void zc0301_urb_complete(struct urb *urb, struct pt_regs* regs)
307 {
308 struct zc0301_device* cam = urb->context;
309 struct zc0301_frame_t** f;
310 size_t imagesize;
311 u8 i;
312 int err = 0;
313
314 if (urb->status == -ENOENT)
315 return;
316
317 f = &cam->frame_current;
318
319 if (cam->stream == STREAM_INTERRUPT) {
320 cam->stream = STREAM_OFF;
321 if ((*f))
322 (*f)->state = F_QUEUED;
323 DBG(3, "Stream interrupted");
324 wake_up(&cam->wait_stream);
325 }
326
327 if (cam->state & DEV_DISCONNECTED)
328 return;
329
330 if (cam->state & DEV_MISCONFIGURED) {
331 wake_up_interruptible(&cam->wait_frame);
332 return;
333 }
334
335 if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
336 goto resubmit_urb;
337
338 if (!(*f))
339 (*f) = list_entry(cam->inqueue.next, struct zc0301_frame_t,
340 frame);
341
342 imagesize = (cam->sensor.pix_format.width *
343 cam->sensor.pix_format.height *
344 cam->sensor.pix_format.priv) / 8;
345
346 for (i = 0; i < urb->number_of_packets; i++) {
347 unsigned int len, status;
348 void *pos;
349 u16* soi;
350 u8 sof;
351
352 len = urb->iso_frame_desc[i].actual_length;
353 status = urb->iso_frame_desc[i].status;
354 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
355
356 if (status) {
357 DBG(3, "Error in isochronous frame");
358 (*f)->state = F_ERROR;
359 continue;
360 }
361
362 sof = (*(soi = pos) == 0xd8ff);
363
364 PDBGG("Isochrnous frame: length %u, #%u i,", len, i);
365
366 if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
367 start_of_frame:
368 if (sof) {
369 (*f)->state = F_GRABBING;
370 (*f)->buf.bytesused = 0;
371 do_gettimeofday(&(*f)->buf.timestamp);
372 DBG(3, "SOF detected: new video frame");
373 }
374
375 if ((*f)->state == F_GRABBING) {
376 if (sof && (*f)->buf.bytesused)
377 goto end_of_frame;
378
379 if ((*f)->buf.bytesused + len > imagesize) {
380 DBG(3, "Video frame size exceeded");
381 (*f)->state = F_ERROR;
382 continue;
383 }
384
385 memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, len);
386 (*f)->buf.bytesused += len;
387
388 if ((*f)->buf.bytesused == imagesize) {
389 u32 b;
390 end_of_frame:
391 b = (*f)->buf.bytesused;
392 (*f)->state = F_DONE;
393 (*f)->buf.sequence= ++cam->frame_count;
394 spin_lock(&cam->queue_lock);
395 list_move_tail(&(*f)->frame, &cam->outqueue);
396 if (!list_empty(&cam->inqueue))
397 (*f) = list_entry(cam->inqueue.next,
398 struct zc0301_frame_t,
399 frame);
400 else
401 (*f) = NULL;
402 spin_unlock(&cam->queue_lock);
403 DBG(3, "Video frame captured: : %lu bytes",
404 (unsigned long)(b));
405
406 if (!(*f))
407 goto resubmit_urb;
408
409 if (sof)
410 goto start_of_frame;
411 }
412 }
413 }
414
415 resubmit_urb:
416 urb->dev = cam->usbdev;
417 err = usb_submit_urb(urb, GFP_ATOMIC);
418 if (err < 0 && err != -EPERM) {
419 cam->state |= DEV_MISCONFIGURED;
420 DBG(1, "usb_submit_urb() failed");
421 }
422
423 wake_up_interruptible(&cam->wait_frame);
424 }
425
426
427 static int zc0301_start_transfer(struct zc0301_device* cam)
428 {
429 struct usb_device *udev = cam->usbdev;
430 struct urb* urb;
431 const unsigned int wMaxPacketSize[] = {0, 128, 192, 256, 384,
432 512, 768, 1023};
433 const unsigned int psz = wMaxPacketSize[ZC0301_ALTERNATE_SETTING];
434 s8 i, j;
435 int err = 0;
436
437 for (i = 0; i < ZC0301_URBS; i++) {
438 cam->transfer_buffer[i] = kzalloc(ZC0301_ISO_PACKETS * psz,
439 GFP_KERNEL);
440 if (!cam->transfer_buffer[i]) {
441 err = -ENOMEM;
442 DBG(1, "Not enough memory");
443 goto free_buffers;
444 }
445 }
446
447 for (i = 0; i < ZC0301_URBS; i++) {
448 urb = usb_alloc_urb(ZC0301_ISO_PACKETS, GFP_KERNEL);
449 cam->urb[i] = urb;
450 if (!urb) {
451 err = -ENOMEM;
452 DBG(1, "usb_alloc_urb() failed");
453 goto free_urbs;
454 }
455 urb->dev = udev;
456 urb->context = cam;
457 urb->pipe = usb_rcvisocpipe(udev, 1);
458 urb->transfer_flags = URB_ISO_ASAP;
459 urb->number_of_packets = ZC0301_ISO_PACKETS;
460 urb->complete = zc0301_urb_complete;
461 urb->transfer_buffer = cam->transfer_buffer[i];
462 urb->transfer_buffer_length = psz * ZC0301_ISO_PACKETS;
463 urb->interval = 1;
464 for (j = 0; j < ZC0301_ISO_PACKETS; j++) {
465 urb->iso_frame_desc[j].offset = psz * j;
466 urb->iso_frame_desc[j].length = psz;
467 }
468 }
469
470 err = usb_set_interface(udev, 0, ZC0301_ALTERNATE_SETTING);
471 if (err) {
472 DBG(1, "usb_set_interface() failed");
473 goto free_urbs;
474 }
475
476 cam->frame_current = NULL;
477
478 for (i = 0; i < ZC0301_URBS; i++) {
479 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
480 if (err) {
481 for (j = i-1; j >= 0; j--)
482 usb_kill_urb(cam->urb[j]);
483 DBG(1, "usb_submit_urb() failed, error %d", err);
484 goto free_urbs;
485 }
486 }
487
488 return 0;
489
490 free_urbs:
491 for (i = 0; (i < ZC0301_URBS) && cam->urb[i]; i++)
492 usb_free_urb(cam->urb[i]);
493
494 free_buffers:
495 for (i = 0; (i < ZC0301_URBS) && cam->transfer_buffer[i]; i++)
496 kfree(cam->transfer_buffer[i]);
497
498 return err;
499 }
500
501
502 static int zc0301_stop_transfer(struct zc0301_device* cam)
503 {
504 struct usb_device *udev = cam->usbdev;
505 s8 i;
506 int err = 0;
507
508 if (cam->state & DEV_DISCONNECTED)
509 return 0;
510
511 for (i = ZC0301_URBS-1; i >= 0; i--) {
512 usb_kill_urb(cam->urb[i]);
513 usb_free_urb(cam->urb[i]);
514 kfree(cam->transfer_buffer[i]);
515 }
516
517 err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
518 if (err)
519 DBG(3, "usb_set_interface() failed");
520
521 return err;
522 }
523
524
525 static int zc0301_stream_interrupt(struct zc0301_device* cam)
526 {
527 long timeout;
528
529 cam->stream = STREAM_INTERRUPT;
530 timeout = wait_event_timeout(cam->wait_stream,
531 (cam->stream == STREAM_OFF) ||
532 (cam->state & DEV_DISCONNECTED),
533 ZC0301_URB_TIMEOUT);
534 if (cam->state & DEV_DISCONNECTED)
535 return -ENODEV;
536 else if (cam->stream != STREAM_OFF) {
537 cam->state |= DEV_MISCONFIGURED;
538 DBG(1, "URB timeout reached. The camera is misconfigured. To "
539 "use it, close and open /dev/video%d again.",
540 cam->v4ldev->minor);
541 return -EIO;
542 }
543
544 return 0;
545 }
546
547 /*****************************************************************************/
548
549 static int
550 zc0301_set_compression(struct zc0301_device* cam,
551 struct v4l2_jpegcompression* compression)
552 {
553 int r, err = 0;
554
555 if ((r = zc0301_read_reg(cam, 0x0008)) < 0)
556 err += r;
557 err += zc0301_write_reg(cam, 0x0008, r | 0x11 | compression->quality);
558
559 return err ? -EIO : 0;
560 }
561
562
563 static int zc0301_init(struct zc0301_device* cam)
564 {
565 struct zc0301_sensor* s = &cam->sensor;
566 struct v4l2_control ctrl;
567 struct v4l2_queryctrl *qctrl;
568 struct v4l2_rect* rect;
569 u8 i = 0;
570 int err = 0;
571
572 if (!(cam->state & DEV_INITIALIZED)) {
573 init_waitqueue_head(&cam->open);
574 qctrl = s->qctrl;
575 rect = &(s->cropcap.defrect);
576 cam->compression.quality = ZC0301_COMPRESSION_QUALITY;
577 } else { /* use current values */
578 qctrl = s->_qctrl;
579 rect = &(s->_rect);
580 }
581
582 if (s->init) {
583 err = s->init(cam);
584 if (err) {
585 DBG(3, "Sensor initialization failed");
586 return err;
587 }
588 }
589
590 if ((err = zc0301_set_compression(cam, &cam->compression))) {
591 DBG(3, "set_compression() failed");
592 return err;
593 }
594
595 if (s->set_crop)
596 if ((err = s->set_crop(cam, rect))) {
597 DBG(3, "set_crop() failed");
598 return err;
599 }
600
601 if (s->set_ctrl) {
602 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
603 if (s->qctrl[i].id != 0 &&
604 !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
605 ctrl.id = s->qctrl[i].id;
606 ctrl.value = qctrl[i].default_value;
607 err = s->set_ctrl(cam, &ctrl);
608 if (err) {
609 DBG(3, "Set %s control failed",
610 s->qctrl[i].name);
611 return err;
612 }
613 DBG(3, "Image sensor supports '%s' control",
614 s->qctrl[i].name);
615 }
616 }
617
618 if (!(cam->state & DEV_INITIALIZED)) {
619 mutex_init(&cam->fileop_mutex);
620 spin_lock_init(&cam->queue_lock);
621 init_waitqueue_head(&cam->wait_frame);
622 init_waitqueue_head(&cam->wait_stream);
623 cam->nreadbuffers = 2;
624 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
625 memcpy(&(s->_rect), &(s->cropcap.defrect),
626 sizeof(struct v4l2_rect));
627 cam->state |= DEV_INITIALIZED;
628 }
629
630 DBG(2, "Initialization succeeded");
631 return 0;
632 }
633
634
635 static void zc0301_release_resources(struct zc0301_device* cam)
636 {
637 DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
638 video_set_drvdata(cam->v4ldev, NULL);
639 video_unregister_device(cam->v4ldev);
640 kfree(cam->control_buffer);
641 }
642
643 /*****************************************************************************/
644
645 static int zc0301_open(struct inode* inode, struct file* filp)
646 {
647 struct zc0301_device* cam;
648 int err = 0;
649
650 /*
651 This is the only safe way to prevent race conditions with
652 disconnect
653 */
654 if (!down_read_trylock(&zc0301_disconnect))
655 return -ERESTARTSYS;
656
657 cam = video_get_drvdata(video_devdata(filp));
658
659 if (mutex_lock_interruptible(&cam->dev_mutex)) {
660 up_read(&zc0301_disconnect);
661 return -ERESTARTSYS;
662 }
663
664 if (cam->users) {
665 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
666 if ((filp->f_flags & O_NONBLOCK) ||
667 (filp->f_flags & O_NDELAY)) {
668 err = -EWOULDBLOCK;
669 goto out;
670 }
671 mutex_unlock(&cam->dev_mutex);
672 err = wait_event_interruptible_exclusive(cam->open,
673 cam->state & DEV_DISCONNECTED
674 || !cam->users);
675 if (err) {
676 up_read(&zc0301_disconnect);
677 return err;
678 }
679 if (cam->state & DEV_DISCONNECTED) {
680 up_read(&zc0301_disconnect);
681 return -ENODEV;
682 }
683 mutex_lock(&cam->dev_mutex);
684 }
685
686
687 if (cam->state & DEV_MISCONFIGURED) {
688 err = zc0301_init(cam);
689 if (err) {
690 DBG(1, "Initialization failed again. "
691 "I will retry on next open().");
692 goto out;
693 }
694 cam->state &= ~DEV_MISCONFIGURED;
695 }
696
697 if ((err = zc0301_start_transfer(cam)))
698 goto out;
699
700 filp->private_data = cam;
701 cam->users++;
702 cam->io = IO_NONE;
703 cam->stream = STREAM_OFF;
704 cam->nbuffers = 0;
705 cam->frame_count = 0;
706 zc0301_empty_framequeues(cam);
707
708 DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
709
710 out:
711 mutex_unlock(&cam->dev_mutex);
712 up_read(&zc0301_disconnect);
713 return err;
714 }
715
716
717 static int zc0301_release(struct inode* inode, struct file* filp)
718 {
719 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
720
721 mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
722
723 zc0301_stop_transfer(cam);
724
725 zc0301_release_buffers(cam);
726
727 if (cam->state & DEV_DISCONNECTED) {
728 zc0301_release_resources(cam);
729 usb_put_dev(cam->usbdev);
730 mutex_unlock(&cam->dev_mutex);
731 kfree(cam);
732 return 0;
733 }
734
735 cam->users--;
736 wake_up_interruptible_nr(&cam->open, 1);
737
738 DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
739
740 mutex_unlock(&cam->dev_mutex);
741
742 return 0;
743 }
744
745
746 static ssize_t
747 zc0301_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
748 {
749 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
750 struct zc0301_frame_t* f, * i;
751 unsigned long lock_flags;
752 long timeout;
753 int err = 0;
754
755 if (mutex_lock_interruptible(&cam->fileop_mutex))
756 return -ERESTARTSYS;
757
758 if (cam->state & DEV_DISCONNECTED) {
759 DBG(1, "Device not present");
760 mutex_unlock(&cam->fileop_mutex);
761 return -ENODEV;
762 }
763
764 if (cam->state & DEV_MISCONFIGURED) {
765 DBG(1, "The camera is misconfigured. Close and open it "
766 "again.");
767 mutex_unlock(&cam->fileop_mutex);
768 return -EIO;
769 }
770
771 if (cam->io == IO_MMAP) {
772 DBG(3, "Close and open the device again to choose the read "
773 "method");
774 mutex_unlock(&cam->fileop_mutex);
775 return -EINVAL;
776 }
777
778 if (cam->io == IO_NONE) {
779 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
780 DBG(1, "read() failed, not enough memory");
781 mutex_unlock(&cam->fileop_mutex);
782 return -ENOMEM;
783 }
784 cam->io = IO_READ;
785 cam->stream = STREAM_ON;
786 }
787
788 if (list_empty(&cam->inqueue)) {
789 if (!list_empty(&cam->outqueue))
790 zc0301_empty_framequeues(cam);
791 zc0301_queue_unusedframes(cam);
792 }
793
794 if (!count) {
795 mutex_unlock(&cam->fileop_mutex);
796 return 0;
797 }
798
799 if (list_empty(&cam->outqueue)) {
800 if (filp->f_flags & O_NONBLOCK) {
801 mutex_unlock(&cam->fileop_mutex);
802 return -EAGAIN;
803 }
804 timeout = wait_event_interruptible_timeout
805 ( cam->wait_frame,
806 (!list_empty(&cam->outqueue)) ||
807 (cam->state & DEV_DISCONNECTED) ||
808 (cam->state & DEV_MISCONFIGURED),
809 cam->module_param.frame_timeout *
810 1000 * msecs_to_jiffies(1) );
811 if (timeout < 0) {
812 mutex_unlock(&cam->fileop_mutex);
813 return timeout;
814 }
815 if (cam->state & DEV_DISCONNECTED) {
816 mutex_unlock(&cam->fileop_mutex);
817 return -ENODEV;
818 }
819 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
820 mutex_unlock(&cam->fileop_mutex);
821 return -EIO;
822 }
823 }
824
825 f = list_entry(cam->outqueue.prev, struct zc0301_frame_t, frame);
826
827 if (count > f->buf.bytesused)
828 count = f->buf.bytesused;
829
830 if (copy_to_user(buf, f->bufmem, count)) {
831 err = -EFAULT;
832 goto exit;
833 }
834 *f_pos += count;
835
836 exit:
837 spin_lock_irqsave(&cam->queue_lock, lock_flags);
838 list_for_each_entry(i, &cam->outqueue, frame)
839 i->state = F_UNUSED;
840 INIT_LIST_HEAD(&cam->outqueue);
841 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
842
843 zc0301_queue_unusedframes(cam);
844
845 PDBGG("Frame #%lu, bytes read: %zu",
846 (unsigned long)f->buf.index, count);
847
848 mutex_unlock(&cam->fileop_mutex);
849
850 return err ? err : count;
851 }
852
853
854 static unsigned int zc0301_poll(struct file *filp, poll_table *wait)
855 {
856 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
857 struct zc0301_frame_t* f;
858 unsigned long lock_flags;
859 unsigned int mask = 0;
860
861 if (mutex_lock_interruptible(&cam->fileop_mutex))
862 return POLLERR;
863
864 if (cam->state & DEV_DISCONNECTED) {
865 DBG(1, "Device not present");
866 goto error;
867 }
868
869 if (cam->state & DEV_MISCONFIGURED) {
870 DBG(1, "The camera is misconfigured. Close and open it "
871 "again.");
872 goto error;
873 }
874
875 if (cam->io == IO_NONE) {
876 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
877 DBG(1, "poll() failed, not enough memory");
878 goto error;
879 }
880 cam->io = IO_READ;
881 cam->stream = STREAM_ON;
882 }
883
884 if (cam->io == IO_READ) {
885 spin_lock_irqsave(&cam->queue_lock, lock_flags);
886 list_for_each_entry(f, &cam->outqueue, frame)
887 f->state = F_UNUSED;
888 INIT_LIST_HEAD(&cam->outqueue);
889 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
890 zc0301_queue_unusedframes(cam);
891 }
892
893 poll_wait(filp, &cam->wait_frame, wait);
894
895 if (!list_empty(&cam->outqueue))
896 mask |= POLLIN | POLLRDNORM;
897
898 mutex_unlock(&cam->fileop_mutex);
899
900 return mask;
901
902 error:
903 mutex_unlock(&cam->fileop_mutex);
904 return POLLERR;
905 }
906
907
908 static void zc0301_vm_open(struct vm_area_struct* vma)
909 {
910 struct zc0301_frame_t* f = vma->vm_private_data;
911 f->vma_use_count++;
912 }
913
914
915 static void zc0301_vm_close(struct vm_area_struct* vma)
916 {
917 /* NOTE: buffers are not freed here */
918 struct zc0301_frame_t* f = vma->vm_private_data;
919 f->vma_use_count--;
920 }
921
922
923 static struct vm_operations_struct zc0301_vm_ops = {
924 .open = zc0301_vm_open,
925 .close = zc0301_vm_close,
926 };
927
928
929 static int zc0301_mmap(struct file* filp, struct vm_area_struct *vma)
930 {
931 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
932 unsigned long size = vma->vm_end - vma->vm_start,
933 start = vma->vm_start;
934 void *pos;
935 u32 i;
936
937 if (mutex_lock_interruptible(&cam->fileop_mutex))
938 return -ERESTARTSYS;
939
940 if (cam->state & DEV_DISCONNECTED) {
941 DBG(1, "Device not present");
942 mutex_unlock(&cam->fileop_mutex);
943 return -ENODEV;
944 }
945
946 if (cam->state & DEV_MISCONFIGURED) {
947 DBG(1, "The camera is misconfigured. Close and open it "
948 "again.");
949 mutex_unlock(&cam->fileop_mutex);
950 return -EIO;
951 }
952
953 if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
954 size != PAGE_ALIGN(cam->frame[0].buf.length)) {
955 mutex_unlock(&cam->fileop_mutex);
956 return -EINVAL;
957 }
958
959 for (i = 0; i < cam->nbuffers; i++) {
960 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
961 break;
962 }
963 if (i == cam->nbuffers) {
964 mutex_unlock(&cam->fileop_mutex);
965 return -EINVAL;
966 }
967
968 vma->vm_flags |= VM_IO;
969 vma->vm_flags |= VM_RESERVED;
970
971 pos = cam->frame[i].bufmem;
972 while (size > 0) { /* size is page-aligned */
973 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
974 mutex_unlock(&cam->fileop_mutex);
975 return -EAGAIN;
976 }
977 start += PAGE_SIZE;
978 pos += PAGE_SIZE;
979 size -= PAGE_SIZE;
980 }
981
982 vma->vm_ops = &zc0301_vm_ops;
983 vma->vm_private_data = &cam->frame[i];
984
985 zc0301_vm_open(vma);
986
987 mutex_unlock(&cam->fileop_mutex);
988
989 return 0;
990 }
991
992 /*****************************************************************************/
993
994 static int
995 zc0301_vidioc_querycap(struct zc0301_device* cam, void __user * arg)
996 {
997 struct v4l2_capability cap = {
998 .driver = "zc0301",
999 .version = ZC0301_MODULE_VERSION_CODE,
1000 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1001 V4L2_CAP_STREAMING,
1002 };
1003
1004 strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1005 if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1006 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
1007 sizeof(cap.bus_info));
1008
1009 if (copy_to_user(arg, &cap, sizeof(cap)))
1010 return -EFAULT;
1011
1012 return 0;
1013 }
1014
1015
1016 static int
1017 zc0301_vidioc_enuminput(struct zc0301_device* cam, void __user * arg)
1018 {
1019 struct v4l2_input i;
1020
1021 if (copy_from_user(&i, arg, sizeof(i)))
1022 return -EFAULT;
1023
1024 if (i.index)
1025 return -EINVAL;
1026
1027 memset(&i, 0, sizeof(i));
1028 strcpy(i.name, "Camera");
1029 i.type = V4L2_INPUT_TYPE_CAMERA;
1030
1031 if (copy_to_user(arg, &i, sizeof(i)))
1032 return -EFAULT;
1033
1034 return 0;
1035 }
1036
1037
1038 static int
1039 zc0301_vidioc_g_input(struct zc0301_device* cam, void __user * arg)
1040 {
1041 int index = 0;
1042
1043 if (copy_to_user(arg, &index, sizeof(index)))
1044 return -EFAULT;
1045
1046 return 0;
1047 }
1048
1049
1050 static int
1051 zc0301_vidioc_s_input(struct zc0301_device* cam, void __user * arg)
1052 {
1053 int index;
1054
1055 if (copy_from_user(&index, arg, sizeof(index)))
1056 return -EFAULT;
1057
1058 if (index != 0)
1059 return -EINVAL;
1060
1061 return 0;
1062 }
1063
1064
1065 static int
1066 zc0301_vidioc_query_ctrl(struct zc0301_device* cam, void __user * arg)
1067 {
1068 struct zc0301_sensor* s = &cam->sensor;
1069 struct v4l2_queryctrl qc;
1070 u8 i;
1071
1072 if (copy_from_user(&qc, arg, sizeof(qc)))
1073 return -EFAULT;
1074
1075 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1076 if (qc.id && qc.id == s->qctrl[i].id) {
1077 memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1078 if (copy_to_user(arg, &qc, sizeof(qc)))
1079 return -EFAULT;
1080 return 0;
1081 }
1082
1083 return -EINVAL;
1084 }
1085
1086
1087 static int
1088 zc0301_vidioc_g_ctrl(struct zc0301_device* cam, void __user * arg)
1089 {
1090 struct zc0301_sensor* s = &cam->sensor;
1091 struct v4l2_control ctrl;
1092 int err = 0;
1093 u8 i;
1094
1095 if (!s->get_ctrl && !s->set_ctrl)
1096 return -EINVAL;
1097
1098 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1099 return -EFAULT;
1100
1101 if (!s->get_ctrl) {
1102 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1103 if (ctrl.id == s->qctrl[i].id) {
1104 ctrl.value = s->_qctrl[i].default_value;
1105 goto exit;
1106 }
1107 return -EINVAL;
1108 } else
1109 err = s->get_ctrl(cam, &ctrl);
1110
1111 exit:
1112 if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1113 return -EFAULT;
1114
1115 return err;
1116 }
1117
1118
1119 static int
1120 zc0301_vidioc_s_ctrl(struct zc0301_device* cam, void __user * arg)
1121 {
1122 struct zc0301_sensor* s = &cam->sensor;
1123 struct v4l2_control ctrl;
1124 u8 i;
1125 int err = 0;
1126
1127 if (!s->set_ctrl)
1128 return -EINVAL;
1129
1130 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1131 return -EFAULT;
1132
1133 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1134 if (ctrl.id == s->qctrl[i].id) {
1135 if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1136 return -EINVAL;
1137 if (ctrl.value < s->qctrl[i].minimum ||
1138 ctrl.value > s->qctrl[i].maximum)
1139 return -ERANGE;
1140 ctrl.value -= ctrl.value % s->qctrl[i].step;
1141 break;
1142 }
1143
1144 if ((err = s->set_ctrl(cam, &ctrl)))
1145 return err;
1146
1147 s->_qctrl[i].default_value = ctrl.value;
1148
1149 return 0;
1150 }
1151
1152
1153 static int
1154 zc0301_vidioc_cropcap(struct zc0301_device* cam, void __user * arg)
1155 {
1156 struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1157
1158 cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1159 cc->pixelaspect.numerator = 1;
1160 cc->pixelaspect.denominator = 1;
1161
1162 if (copy_to_user(arg, cc, sizeof(*cc)))
1163 return -EFAULT;
1164
1165 return 0;
1166 }
1167
1168
1169 static int
1170 zc0301_vidioc_g_crop(struct zc0301_device* cam, void __user * arg)
1171 {
1172 struct zc0301_sensor* s = &cam->sensor;
1173 struct v4l2_crop crop = {
1174 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1175 };
1176
1177 memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1178
1179 if (copy_to_user(arg, &crop, sizeof(crop)))
1180 return -EFAULT;
1181
1182 return 0;
1183 }
1184
1185
1186 static int
1187 zc0301_vidioc_s_crop(struct zc0301_device* cam, void __user * arg)
1188 {
1189 struct zc0301_sensor* s = &cam->sensor;
1190 struct v4l2_crop crop;
1191 struct v4l2_rect* rect;
1192 struct v4l2_rect* bounds = &(s->cropcap.bounds);
1193 const enum zc0301_stream_state stream = cam->stream;
1194 const u32 nbuffers = cam->nbuffers;
1195 u32 i;
1196 int err = 0;
1197
1198 if (copy_from_user(&crop, arg, sizeof(crop)))
1199 return -EFAULT;
1200
1201 rect = &(crop.c);
1202
1203 if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1204 return -EINVAL;
1205
1206 if (cam->module_param.force_munmap)
1207 for (i = 0; i < cam->nbuffers; i++)
1208 if (cam->frame[i].vma_use_count) {
1209 DBG(3, "VIDIOC_S_CROP failed. "
1210 "Unmap the buffers first.");
1211 return -EINVAL;
1212 }
1213
1214 if (!s->set_crop) {
1215 memcpy(rect, &(s->_rect), sizeof(*rect));
1216 if (copy_to_user(arg, &crop, sizeof(crop)))
1217 return -EFAULT;
1218 return 0;
1219 }
1220
1221 rect->left &= ~7L;
1222 rect->top &= ~7L;
1223 if (rect->width < 8)
1224 rect->width = 8;
1225 if (rect->height < 8)
1226 rect->height = 8;
1227 if (rect->width > bounds->width)
1228 rect->width = bounds->width;
1229 if (rect->height > bounds->height)
1230 rect->height = bounds->height;
1231 if (rect->left < bounds->left)
1232 rect->left = bounds->left;
1233 if (rect->top < bounds->top)
1234 rect->top = bounds->top;
1235 if (rect->left + rect->width > bounds->left + bounds->width)
1236 rect->left = bounds->left+bounds->width - rect->width;
1237 if (rect->top + rect->height > bounds->top + bounds->height)
1238 rect->top = bounds->top+bounds->height - rect->height;
1239 rect->width &= ~7L;
1240 rect->height &= ~7L;
1241
1242 if (cam->stream == STREAM_ON)
1243 if ((err = zc0301_stream_interrupt(cam)))
1244 return err;
1245
1246 if (copy_to_user(arg, &crop, sizeof(crop))) {
1247 cam->stream = stream;
1248 return -EFAULT;
1249 }
1250
1251 if (cam->module_param.force_munmap || cam->io == IO_READ)
1252 zc0301_release_buffers(cam);
1253
1254 if (s->set_crop)
1255 err += s->set_crop(cam, rect);
1256
1257 if (err) { /* atomic, no rollback in ioctl() */
1258 cam->state |= DEV_MISCONFIGURED;
1259 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1260 "use the camera, close and open /dev/video%d again.",
1261 cam->v4ldev->minor);
1262 return -EIO;
1263 }
1264
1265 s->pix_format.width = rect->width;
1266 s->pix_format.height = rect->height;
1267 memcpy(&(s->_rect), rect, sizeof(*rect));
1268
1269 if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
1270 nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1271 cam->state |= DEV_MISCONFIGURED;
1272 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1273 "use the camera, close and open /dev/video%d again.",
1274 cam->v4ldev->minor);
1275 return -ENOMEM;
1276 }
1277
1278 if (cam->io == IO_READ)
1279 zc0301_empty_framequeues(cam);
1280 else if (cam->module_param.force_munmap)
1281 zc0301_requeue_outqueue(cam);
1282
1283 cam->stream = stream;
1284
1285 return 0;
1286 }
1287
1288
1289 static int
1290 zc0301_vidioc_enum_fmt(struct zc0301_device* cam, void __user * arg)
1291 {
1292 struct v4l2_fmtdesc fmtd;
1293
1294 if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1295 return -EFAULT;
1296
1297 if (fmtd.index == 0) {
1298 strcpy(fmtd.description, "JPEG");
1299 fmtd.pixelformat = V4L2_PIX_FMT_JPEG;
1300 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1301 } else
1302 return -EINVAL;
1303
1304 fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1305 memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1306
1307 if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1308 return -EFAULT;
1309
1310 return 0;
1311 }
1312
1313
1314 static int
1315 zc0301_vidioc_g_fmt(struct zc0301_device* cam, void __user * arg)
1316 {
1317 struct v4l2_format format;
1318 struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
1319
1320 if (copy_from_user(&format, arg, sizeof(format)))
1321 return -EFAULT;
1322
1323 if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1324 return -EINVAL;
1325
1326 pfmt->bytesperline = 0;
1327 pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1328 pfmt->field = V4L2_FIELD_NONE;
1329 memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1330
1331 if (copy_to_user(arg, &format, sizeof(format)))
1332 return -EFAULT;
1333
1334 return 0;
1335 }
1336
1337
1338 static int
1339 zc0301_vidioc_try_s_fmt(struct zc0301_device* cam, unsigned int cmd,
1340 void __user * arg)
1341 {
1342 struct zc0301_sensor* s = &cam->sensor;
1343 struct v4l2_format format;
1344 struct v4l2_pix_format* pix;
1345 struct v4l2_pix_format* pfmt = &(s->pix_format);
1346 struct v4l2_rect* bounds = &(s->cropcap.bounds);
1347 struct v4l2_rect rect;
1348 const enum zc0301_stream_state stream = cam->stream;
1349 const u32 nbuffers = cam->nbuffers;
1350 u32 i;
1351 int err = 0;
1352
1353 if (copy_from_user(&format, arg, sizeof(format)))
1354 return -EFAULT;
1355
1356 pix = &(format.fmt.pix);
1357
1358 if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1359 return -EINVAL;
1360
1361 memcpy(&rect, &(s->_rect), sizeof(rect));
1362
1363 if (!s->set_crop) {
1364 pix->width = rect.width;
1365 pix->height = rect.height;
1366 } else {
1367 rect.width = pix->width;
1368 rect.height = pix->height;
1369 }
1370
1371 if (rect.width < 8)
1372 rect.width = 8;
1373 if (rect.height < 8)
1374 rect.height = 8;
1375 if (rect.width > bounds->left + bounds->width - rect.left)
1376 rect.width = bounds->left + bounds->width - rect.left;
1377 if (rect.height > bounds->top + bounds->height - rect.top)
1378 rect.height = bounds->top + bounds->height - rect.top;
1379 rect.width &= ~7L;
1380 rect.height &= ~7L;
1381
1382 pix->width = rect.width;
1383 pix->height = rect.height;
1384 pix->pixelformat = pfmt->pixelformat;
1385 pix->priv = pfmt->priv;
1386 pix->colorspace = pfmt->colorspace;
1387 pix->bytesperline = 0;
1388 pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
1389 pix->field = V4L2_FIELD_NONE;
1390
1391 if (cmd == VIDIOC_TRY_FMT) {
1392 if (copy_to_user(arg, &format, sizeof(format)))
1393 return -EFAULT;
1394 return 0;
1395 }
1396
1397 if (cam->module_param.force_munmap)
1398 for (i = 0; i < cam->nbuffers; i++)
1399 if (cam->frame[i].vma_use_count) {
1400 DBG(3, "VIDIOC_S_FMT failed. "
1401 "Unmap the buffers first.");
1402 return -EINVAL;
1403 }
1404
1405 if (cam->stream == STREAM_ON)
1406 if ((err = zc0301_stream_interrupt(cam)))
1407 return err;
1408
1409 if (copy_to_user(arg, &format, sizeof(format))) {
1410 cam->stream = stream;
1411 return -EFAULT;
1412 }
1413
1414 if (cam->module_param.force_munmap || cam->io == IO_READ)
1415 zc0301_release_buffers(cam);
1416
1417 if (s->set_crop)
1418 err += s->set_crop(cam, &rect);
1419
1420 if (err) { /* atomic, no rollback in ioctl() */
1421 cam->state |= DEV_MISCONFIGURED;
1422 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
1423 "use the camera, close and open /dev/video%d again.",
1424 cam->v4ldev->minor);
1425 return -EIO;
1426 }
1427
1428 memcpy(pfmt, pix, sizeof(*pix));
1429 memcpy(&(s->_rect), &rect, sizeof(rect));
1430
1431 if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
1432 nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1433 cam->state |= DEV_MISCONFIGURED;
1434 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
1435 "use the camera, close and open /dev/video%d again.",
1436 cam->v4ldev->minor);
1437 return -ENOMEM;
1438 }
1439
1440 if (cam->io == IO_READ)
1441 zc0301_empty_framequeues(cam);
1442 else if (cam->module_param.force_munmap)
1443 zc0301_requeue_outqueue(cam);
1444
1445 cam->stream = stream;
1446
1447 return 0;
1448 }
1449
1450
1451 static int
1452 zc0301_vidioc_g_jpegcomp(struct zc0301_device* cam, void __user * arg)
1453 {
1454 if (copy_to_user(arg, &cam->compression, sizeof(cam->compression)))
1455 return -EFAULT;
1456
1457 return 0;
1458 }
1459
1460
1461 static int
1462 zc0301_vidioc_s_jpegcomp(struct zc0301_device* cam, void __user * arg)
1463 {
1464 struct v4l2_jpegcompression jc;
1465 const enum zc0301_stream_state stream = cam->stream;
1466 int err = 0;
1467
1468 if (copy_from_user(&jc, arg, sizeof(jc)))
1469 return -EFAULT;
1470
1471 if (jc.quality != 0)
1472 return -EINVAL;
1473
1474 if (cam->stream == STREAM_ON)
1475 if ((err = zc0301_stream_interrupt(cam)))
1476 return err;
1477
1478 err += zc0301_set_compression(cam, &jc);
1479 if (err) { /* atomic, no rollback in ioctl() */
1480 cam->state |= DEV_MISCONFIGURED;
1481 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
1482 "problems. To use the camera, close and open "
1483 "/dev/video%d again.", cam->v4ldev->minor);
1484 return -EIO;
1485 }
1486
1487 cam->compression.quality = jc.quality;
1488
1489 cam->stream = stream;
1490
1491 return 0;
1492 }
1493
1494
1495 static int
1496 zc0301_vidioc_reqbufs(struct zc0301_device* cam, void __user * arg)
1497 {
1498 struct v4l2_requestbuffers rb;
1499 u32 i;
1500 int err;
1501
1502 if (copy_from_user(&rb, arg, sizeof(rb)))
1503 return -EFAULT;
1504
1505 if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1506 rb.memory != V4L2_MEMORY_MMAP)
1507 return -EINVAL;
1508
1509 if (cam->io == IO_READ) {
1510 DBG(3, "Close and open the device again to choose the mmap "
1511 "I/O method");
1512 return -EINVAL;
1513 }
1514
1515 for (i = 0; i < cam->nbuffers; i++)
1516 if (cam->frame[i].vma_use_count) {
1517 DBG(3, "VIDIOC_REQBUFS failed. "
1518 "Previous buffers are still mapped.");
1519 return -EINVAL;
1520 }
1521
1522 if (cam->stream == STREAM_ON)
1523 if ((err = zc0301_stream_interrupt(cam)))
1524 return err;
1525
1526 zc0301_empty_framequeues(cam);
1527
1528 zc0301_release_buffers(cam);
1529 if (rb.count)
1530 rb.count = zc0301_request_buffers(cam, rb.count, IO_MMAP);
1531
1532 if (copy_to_user(arg, &rb, sizeof(rb))) {
1533 zc0301_release_buffers(cam);
1534 cam->io = IO_NONE;
1535 return -EFAULT;
1536 }
1537
1538 cam->io = rb.count ? IO_MMAP : IO_NONE;
1539
1540 return 0;
1541 }
1542
1543
1544 static int
1545 zc0301_vidioc_querybuf(struct zc0301_device* cam, void __user * arg)
1546 {
1547 struct v4l2_buffer b;
1548
1549 if (copy_from_user(&b, arg, sizeof(b)))
1550 return -EFAULT;
1551
1552 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1553 b.index >= cam->nbuffers || cam->io != IO_MMAP)
1554 return -EINVAL;
1555
1556 memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
1557
1558 if (cam->frame[b.index].vma_use_count)
1559 b.flags |= V4L2_BUF_FLAG_MAPPED;
1560
1561 if (cam->frame[b.index].state == F_DONE)
1562 b.flags |= V4L2_BUF_FLAG_DONE;
1563 else if (cam->frame[b.index].state != F_UNUSED)
1564 b.flags |= V4L2_BUF_FLAG_QUEUED;
1565
1566 if (copy_to_user(arg, &b, sizeof(b)))
1567 return -EFAULT;
1568
1569 return 0;
1570 }
1571
1572
1573 static int
1574 zc0301_vidioc_qbuf(struct zc0301_device* cam, void __user * arg)
1575 {
1576 struct v4l2_buffer b;
1577 unsigned long lock_flags;
1578
1579 if (copy_from_user(&b, arg, sizeof(b)))
1580 return -EFAULT;
1581
1582 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1583 b.index >= cam->nbuffers || cam->io != IO_MMAP)
1584 return -EINVAL;
1585
1586 if (cam->frame[b.index].state != F_UNUSED)
1587 return -EINVAL;
1588
1589 cam->frame[b.index].state = F_QUEUED;
1590
1591 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1592 list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
1593 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1594
1595 PDBGG("Frame #%lu queued", (unsigned long)b.index);
1596
1597 return 0;
1598 }
1599
1600
1601 static int
1602 zc0301_vidioc_dqbuf(struct zc0301_device* cam, struct file* filp,
1603 void __user * arg)
1604 {
1605 struct v4l2_buffer b;
1606 struct zc0301_frame_t *f;
1607 unsigned long lock_flags;
1608 long timeout;
1609
1610 if (copy_from_user(&b, arg, sizeof(b)))
1611 return -EFAULT;
1612
1613 if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
1614 return -EINVAL;
1615
1616 if (list_empty(&cam->outqueue)) {
1617 if (cam->stream == STREAM_OFF)
1618 return -EINVAL;
1619 if (filp->f_flags & O_NONBLOCK)
1620 return -EAGAIN;
1621 timeout = wait_event_interruptible_timeout
1622 ( cam->wait_frame,
1623 (!list_empty(&cam->outqueue)) ||
1624 (cam->state & DEV_DISCONNECTED) ||
1625 (cam->state & DEV_MISCONFIGURED),
1626 cam->module_param.frame_timeout *
1627 1000 * msecs_to_jiffies(1) );
1628 if (timeout < 0)
1629 return timeout;
1630 if (cam->state & DEV_DISCONNECTED)
1631 return -ENODEV;
1632 if (!timeout || (cam->state & DEV_MISCONFIGURED))
1633 return -EIO;
1634 }
1635
1636 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1637 f = list_entry(cam->outqueue.next, struct zc0301_frame_t, frame);
1638 list_del(cam->outqueue.next);
1639 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1640
1641 f->state = F_UNUSED;
1642
1643 memcpy(&b, &f->buf, sizeof(b));
1644 if (f->vma_use_count)
1645 b.flags |= V4L2_BUF_FLAG_MAPPED;
1646
1647 if (copy_to_user(arg, &b, sizeof(b)))
1648 return -EFAULT;
1649
1650 PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
1651
1652 return 0;
1653 }
1654
1655
1656 static int
1657 zc0301_vidioc_streamon(struct zc0301_device* cam, void __user * arg)
1658 {
1659 int type;
1660
1661 if (copy_from_user(&type, arg, sizeof(type)))
1662 return -EFAULT;
1663
1664 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1665 return -EINVAL;
1666
1667 if (list_empty(&cam->inqueue))
1668 return -EINVAL;
1669
1670 cam->stream = STREAM_ON;
1671
1672 DBG(3, "Stream on");
1673
1674 return 0;
1675 }
1676
1677
1678 static int
1679 zc0301_vidioc_streamoff(struct zc0301_device* cam, void __user * arg)
1680 {
1681 int type, err;
1682
1683 if (copy_from_user(&type, arg, sizeof(type)))
1684 return -EFAULT;
1685
1686 if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1687 return -EINVAL;
1688
1689 if (cam->stream == STREAM_ON)
1690 if ((err = zc0301_stream_interrupt(cam)))
1691 return err;
1692
1693 zc0301_empty_framequeues(cam);
1694
1695 DBG(3, "Stream off");
1696
1697 return 0;
1698 }
1699
1700
1701 static int
1702 zc0301_vidioc_g_parm(struct zc0301_device* cam, void __user * arg)
1703 {
1704 struct v4l2_streamparm sp;
1705
1706 if (copy_from_user(&sp, arg, sizeof(sp)))
1707 return -EFAULT;
1708
1709 if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1710 return -EINVAL;
1711
1712 sp.parm.capture.extendedmode = 0;
1713 sp.parm.capture.readbuffers = cam->nreadbuffers;
1714
1715 if (copy_to_user(arg, &sp, sizeof(sp)))
1716 return -EFAULT;
1717
1718 return 0;
1719 }
1720
1721
1722 static int
1723 zc0301_vidioc_s_parm(struct zc0301_device* cam, void __user * arg)
1724 {
1725 struct v4l2_streamparm sp;
1726
1727 if (copy_from_user(&sp, arg, sizeof(sp)))
1728 return -EFAULT;
1729
1730 if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1731 return -EINVAL;
1732
1733 sp.parm.capture.extendedmode = 0;
1734
1735 if (sp.parm.capture.readbuffers == 0)
1736 sp.parm.capture.readbuffers = cam->nreadbuffers;
1737
1738 if (sp.parm.capture.readbuffers > ZC0301_MAX_FRAMES)
1739 sp.parm.capture.readbuffers = ZC0301_MAX_FRAMES;
1740
1741 if (copy_to_user(arg, &sp, sizeof(sp)))
1742 return -EFAULT;
1743
1744 cam->nreadbuffers = sp.parm.capture.readbuffers;
1745
1746 return 0;
1747 }
1748
1749
1750 static int zc0301_ioctl_v4l2(struct inode* inode, struct file* filp,
1751 unsigned int cmd, void __user * arg)
1752 {
1753 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
1754
1755 switch (cmd) {
1756
1757 case VIDIOC_QUERYCAP:
1758 return zc0301_vidioc_querycap(cam, arg);
1759
1760 case VIDIOC_ENUMINPUT:
1761 return zc0301_vidioc_enuminput(cam, arg);
1762
1763 case VIDIOC_G_INPUT:
1764 return zc0301_vidioc_g_input(cam, arg);
1765
1766 case VIDIOC_S_INPUT:
1767 return zc0301_vidioc_s_input(cam, arg);
1768
1769 case VIDIOC_QUERYCTRL:
1770 return zc0301_vidioc_query_ctrl(cam, arg);
1771
1772 case VIDIOC_G_CTRL:
1773 return zc0301_vidioc_g_ctrl(cam, arg);
1774
1775 case VIDIOC_S_CTRL_OLD:
1776 case VIDIOC_S_CTRL:
1777 return zc0301_vidioc_s_ctrl(cam, arg);
1778
1779 case VIDIOC_CROPCAP_OLD:
1780 case VIDIOC_CROPCAP:
1781 return zc0301_vidioc_cropcap(cam, arg);
1782
1783 case VIDIOC_G_CROP:
1784 return zc0301_vidioc_g_crop(cam, arg);
1785
1786 case VIDIOC_S_CROP:
1787 return zc0301_vidioc_s_crop(cam, arg);
1788
1789 case VIDIOC_ENUM_FMT:
1790 return zc0301_vidioc_enum_fmt(cam, arg);
1791
1792 case VIDIOC_G_FMT:
1793 return zc0301_vidioc_g_fmt(cam, arg);
1794
1795 case VIDIOC_TRY_FMT:
1796 case VIDIOC_S_FMT:
1797 return zc0301_vidioc_try_s_fmt(cam, cmd, arg);
1798
1799 case VIDIOC_G_JPEGCOMP:
1800 return zc0301_vidioc_g_jpegcomp(cam, arg);
1801
1802 case VIDIOC_S_JPEGCOMP:
1803 return zc0301_vidioc_s_jpegcomp(cam, arg);
1804
1805 case VIDIOC_REQBUFS:
1806 return zc0301_vidioc_reqbufs(cam, arg);
1807
1808 case VIDIOC_QUERYBUF:
1809 return zc0301_vidioc_querybuf(cam, arg);
1810
1811 case VIDIOC_QBUF:
1812 return zc0301_vidioc_qbuf(cam, arg);
1813
1814 case VIDIOC_DQBUF:
1815 return zc0301_vidioc_dqbuf(cam, filp, arg);
1816
1817 case VIDIOC_STREAMON:
1818 return zc0301_vidioc_streamon(cam, arg);
1819
1820 case VIDIOC_STREAMOFF:
1821 return zc0301_vidioc_streamoff(cam, arg);
1822
1823 case VIDIOC_G_PARM:
1824 return zc0301_vidioc_g_parm(cam, arg);
1825
1826 case VIDIOC_S_PARM_OLD:
1827 case VIDIOC_S_PARM:
1828 return zc0301_vidioc_s_parm(cam, arg);
1829
1830 case VIDIOC_G_STD:
1831 case VIDIOC_S_STD:
1832 case VIDIOC_QUERYSTD:
1833 case VIDIOC_ENUMSTD:
1834 case VIDIOC_QUERYMENU:
1835 return -EINVAL;
1836
1837 default:
1838 return -EINVAL;
1839
1840 }
1841 }
1842
1843
1844 static int zc0301_ioctl(struct inode* inode, struct file* filp,
1845 unsigned int cmd, unsigned long arg)
1846 {
1847 struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
1848 int err = 0;
1849
1850 if (mutex_lock_interruptible(&cam->fileop_mutex))
1851 return -ERESTARTSYS;
1852
1853 if (cam->state & DEV_DISCONNECTED) {
1854 DBG(1, "Device not present");
1855 mutex_unlock(&cam->fileop_mutex);
1856 return -ENODEV;
1857 }
1858
1859 if (cam->state & DEV_MISCONFIGURED) {
1860 DBG(1, "The camera is misconfigured. Close and open it "
1861 "again.");
1862 mutex_unlock(&cam->fileop_mutex);
1863 return -EIO;
1864 }
1865
1866 V4LDBG(3, "zc0301", cmd);
1867
1868 err = zc0301_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
1869
1870 mutex_unlock(&cam->fileop_mutex);
1871
1872 return err;
1873 }
1874
1875
1876 static struct file_operations zc0301_fops = {
1877 .owner = THIS_MODULE,
1878 .open = zc0301_open,
1879 .release = zc0301_release,
1880 .ioctl = zc0301_ioctl,
1881 .read = zc0301_read,
1882 .poll = zc0301_poll,
1883 .mmap = zc0301_mmap,
1884 .llseek = no_llseek,
1885 };
1886
1887 /*****************************************************************************/
1888
1889 static int
1890 zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
1891 {
1892 struct usb_device *udev = interface_to_usbdev(intf);
1893 struct zc0301_device* cam;
1894 static unsigned int dev_nr = 0;
1895 unsigned int i;
1896 int err = 0;
1897
1898 if (!(cam = kzalloc(sizeof(struct zc0301_device), GFP_KERNEL)))
1899 return -ENOMEM;
1900
1901 cam->usbdev = udev;
1902
1903 if (!(cam->control_buffer = kzalloc(4, GFP_KERNEL))) {
1904 DBG(1, "kmalloc() failed");
1905 err = -ENOMEM;
1906 goto fail;
1907 }
1908
1909 if (!(cam->v4ldev = video_device_alloc())) {
1910 DBG(1, "video_device_alloc() failed");
1911 err = -ENOMEM;
1912 goto fail;
1913 }
1914
1915 mutex_init(&cam->dev_mutex);
1916
1917 DBG(2, "ZC0301 Image Processor and Control Chip detected "
1918 "(vid/pid 0x%04X/0x%04X)",id->idVendor, id->idProduct);
1919
1920 for (i = 0; zc0301_sensor_table[i]; i++) {
1921 err = zc0301_sensor_table[i](cam);
1922 if (!err)
1923 break;
1924 }
1925
1926 if (!err)
1927 DBG(2, "%s image sensor detected", cam->sensor.name);
1928 else {
1929 DBG(1, "No supported image sensor detected");
1930 err = -ENODEV;
1931 goto fail;
1932 }
1933
1934 if (zc0301_init(cam)) {
1935 DBG(1, "Initialization failed. I will retry on open().");
1936 cam->state |= DEV_MISCONFIGURED;
1937 }
1938
1939 strcpy(cam->v4ldev->name, "ZC0301 PC Camera");
1940 cam->v4ldev->owner = THIS_MODULE;
1941 cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
1942 cam->v4ldev->hardware = 0;
1943 cam->v4ldev->fops = &zc0301_fops;
1944 cam->v4ldev->minor = video_nr[dev_nr];
1945 cam->v4ldev->release = video_device_release;
1946 video_set_drvdata(cam->v4ldev, cam);
1947
1948 mutex_lock(&cam->dev_mutex);
1949
1950 err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
1951 video_nr[dev_nr]);
1952 if (err) {
1953 DBG(1, "V4L2 device registration failed");
1954 if (err == -ENFILE && video_nr[dev_nr] == -1)
1955 DBG(1, "Free /dev/videoX node not found");
1956 video_nr[dev_nr] = -1;
1957 dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
1958 mutex_unlock(&cam->dev_mutex);
1959 goto fail;
1960 }
1961
1962 DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
1963
1964 cam->module_param.force_munmap = force_munmap[dev_nr];
1965 cam->module_param.frame_timeout = frame_timeout[dev_nr];
1966
1967 dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
1968
1969 usb_set_intfdata(intf, cam);
1970
1971 mutex_unlock(&cam->dev_mutex);
1972
1973 return 0;
1974
1975 fail:
1976 if (cam) {
1977 kfree(cam->control_buffer);
1978 if (cam->v4ldev)
1979 video_device_release(cam->v4ldev);
1980 kfree(cam);
1981 }
1982 return err;
1983 }
1984
1985
1986 static void zc0301_usb_disconnect(struct usb_interface* intf)
1987 {
1988 struct zc0301_device* cam = usb_get_intfdata(intf);
1989
1990 if (!cam)
1991 return;
1992
1993 down_write(&zc0301_disconnect);
1994
1995 mutex_lock(&cam->dev_mutex);
1996
1997 DBG(2, "Disconnecting %s...", cam->v4ldev->name);
1998
1999 wake_up_interruptible_all(&cam->open);
2000
2001 if (cam->users) {
2002 DBG(2, "Device /dev/video%d is open! Deregistration and "
2003 "memory deallocation are deferred on close.",
2004 cam->v4ldev->minor);
2005 cam->state |= DEV_MISCONFIGURED;
2006 zc0301_stop_transfer(cam);
2007 cam->state |= DEV_DISCONNECTED;
2008 wake_up_interruptible(&cam->wait_frame);
2009 wake_up(&cam->wait_stream);
2010 usb_get_dev(cam->usbdev);
2011 } else {
2012 cam->state |= DEV_DISCONNECTED;
2013 zc0301_release_resources(cam);
2014 }
2015
2016 mutex_unlock(&cam->dev_mutex);
2017
2018 if (!cam->users)
2019 kfree(cam);
2020
2021 up_write(&zc0301_disconnect);
2022 }
2023
2024
2025 static struct usb_driver zc0301_usb_driver = {
2026 .name = "zc0301",
2027 .id_table = zc0301_id_table,
2028 .probe = zc0301_usb_probe,
2029 .disconnect = zc0301_usb_disconnect,
2030 };
2031
2032 /*****************************************************************************/
2033
2034 static int __init zc0301_module_init(void)
2035 {
2036 int err = 0;
2037
2038 KDBG(2, ZC0301_MODULE_NAME " v" ZC0301_MODULE_VERSION);
2039 KDBG(3, ZC0301_MODULE_AUTHOR);
2040
2041 if ((err = usb_register(&zc0301_usb_driver)))
2042 KDBG(1, "usb_register() failed");
2043
2044 return err;
2045 }
2046
2047
2048 static void __exit zc0301_module_exit(void)
2049 {
2050 usb_deregister(&zc0301_usb_driver);
2051 }
2052
2053
2054 module_init(zc0301_module_init);
2055 module_exit(zc0301_module_exit);
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