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V4L/DVB (6583): Fix em28xx read stream locking
[deliverable/linux.git] / drivers / media / video / em28xx / em28xx-video.c
1 /*
2 em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
3
4 Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
5 Markus Rechberger <mrechberger@gmail.com>
6 Mauro Carvalho Chehab <mchehab@infradead.org>
7 Sascha Sommer <saschasommer@freenet.de>
8
9 Some parts based on SN9C10x PC Camera Controllers GPL driver made
10 by Luca Risolia <luca.risolia@studio.unibo.it>
11
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
16
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 */
26
27 #include <linux/init.h>
28 #include <linux/list.h>
29 #include <linux/module.h>
30 #include <linux/kernel.h>
31 #include <linux/bitmap.h>
32 #include <linux/usb.h>
33 #include <linux/i2c.h>
34 #include <linux/version.h>
35 #include <linux/mm.h>
36 #include <linux/video_decoder.h>
37 #include <linux/mutex.h>
38
39 #include "em28xx.h"
40 #include <media/v4l2-common.h>
41 #include <media/msp3400.h>
42
43 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
44 "Markus Rechberger <mrechberger@gmail.com>, " \
45 "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
46 "Sascha Sommer <saschasommer@freenet.de>"
47
48 #define DRIVER_NAME "em28xx"
49 #define DRIVER_DESC "Empia em28xx based USB video device driver"
50 #define EM28XX_VERSION_CODE KERNEL_VERSION(0, 0, 1)
51
52 #define em28xx_videodbg(fmt, arg...) do {\
53 if (video_debug) \
54 printk(KERN_INFO "%s %s :"fmt, \
55 dev->name, __FUNCTION__ , ##arg); } while (0)
56
57 MODULE_AUTHOR(DRIVER_AUTHOR);
58 MODULE_DESCRIPTION(DRIVER_DESC);
59 MODULE_LICENSE("GPL");
60
61 static LIST_HEAD(em28xx_devlist);
62
63 static unsigned int card[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
64 static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
65 static unsigned int vbi_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
66 module_param_array(card, int, NULL, 0444);
67 module_param_array(video_nr, int, NULL, 0444);
68 module_param_array(vbi_nr, int, NULL, 0444);
69 MODULE_PARM_DESC(card,"card type");
70 MODULE_PARM_DESC(video_nr,"video device numbers");
71 MODULE_PARM_DESC(vbi_nr,"vbi device numbers");
72
73 static unsigned int video_debug = 0;
74 module_param(video_debug,int,0644);
75 MODULE_PARM_DESC(video_debug,"enable debug messages [video]");
76
77 /* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
78 static unsigned long em28xx_devused;
79
80 /* supported tv norms */
81 static struct em28xx_tvnorm tvnorms[] = {
82 {
83 .name = "PAL",
84 .id = V4L2_STD_PAL,
85 .mode = VIDEO_MODE_PAL,
86 }, {
87 .name = "NTSC",
88 .id = V4L2_STD_NTSC,
89 .mode = VIDEO_MODE_NTSC,
90 }, {
91 .name = "SECAM",
92 .id = V4L2_STD_SECAM,
93 .mode = VIDEO_MODE_SECAM,
94 }, {
95 .name = "PAL-M",
96 .id = V4L2_STD_PAL_M,
97 .mode = VIDEO_MODE_PAL,
98 }
99 };
100
101 #define TVNORMS ARRAY_SIZE(tvnorms)
102
103 /* supported controls */
104 /* Common to all boards */
105 static struct v4l2_queryctrl em28xx_qctrl[] = {
106 {
107 .id = V4L2_CID_AUDIO_VOLUME,
108 .type = V4L2_CTRL_TYPE_INTEGER,
109 .name = "Volume",
110 .minimum = 0x0,
111 .maximum = 0x1f,
112 .step = 0x1,
113 .default_value = 0x1f,
114 .flags = 0,
115 },{
116 .id = V4L2_CID_AUDIO_MUTE,
117 .type = V4L2_CTRL_TYPE_BOOLEAN,
118 .name = "Mute",
119 .minimum = 0,
120 .maximum = 1,
121 .step = 1,
122 .default_value = 1,
123 .flags = 0,
124 }
125 };
126
127 static struct usb_driver em28xx_usb_driver;
128
129
130 /********************* v4l2 interface ******************************************/
131
132 /*
133 * em28xx_config()
134 * inits registers with sane defaults
135 */
136 static int em28xx_config(struct em28xx *dev)
137 {
138
139 /* Sets I2C speed to 100 KHz */
140 if (!dev->is_em2800)
141 em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
142
143 /* enable vbi capturing */
144
145 /* em28xx_write_regs_req(dev,0x00,0x0e,"\xC0",1); audio register */
146 /* em28xx_write_regs_req(dev,0x00,0x0f,"\x80",1); clk register */
147 em28xx_write_regs_req(dev,0x00,0x11,"\x51",1);
148
149 em28xx_audio_usb_mute(dev, 1);
150 dev->mute = 1; /* maybe not the right place... */
151 dev->volume = 0x1f;
152 em28xx_audio_analog_set(dev);
153 em28xx_audio_analog_setup(dev);
154 em28xx_outfmt_set_yuv422(dev);
155 em28xx_colorlevels_set_default(dev);
156 em28xx_compression_disable(dev);
157
158 return 0;
159 }
160
161 /*
162 * em28xx_config_i2c()
163 * configure i2c attached devices
164 */
165 static void em28xx_config_i2c(struct em28xx *dev)
166 {
167 struct v4l2_routing route;
168
169 route.input = INPUT(dev->ctl_input)->vmux;
170 route.output = 0;
171 em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
172 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
173 em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
174 }
175
176 /*
177 * em28xx_empty_framequeues()
178 * prepare queues for incoming and outgoing frames
179 */
180 static void em28xx_empty_framequeues(struct em28xx *dev)
181 {
182 u32 i;
183
184 INIT_LIST_HEAD(&dev->inqueue);
185 INIT_LIST_HEAD(&dev->outqueue);
186
187 for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
188 dev->frame[i].state = F_UNUSED;
189 dev->frame[i].buf.bytesused = 0;
190 }
191 }
192
193 static void video_mux(struct em28xx *dev, int index)
194 {
195 int ainput;
196 struct v4l2_routing route;
197
198 route.input = INPUT(index)->vmux;
199 route.output = 0;
200 dev->ctl_input = index;
201 dev->ctl_ainput = INPUT(index)->amux;
202
203 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
204
205 em28xx_videodbg("Setting input index=%d, vmux=%d, amux=%d\n",index,route.input,dev->ctl_ainput);
206
207 if (dev->has_msp34xx) {
208 if (dev->i2s_speed)
209 em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ, &dev->i2s_speed);
210 route.input = dev->ctl_ainput;
211 route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
212 /* Note: this is msp3400 specific */
213 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING, &route);
214 ainput = EM28XX_AUDIO_SRC_TUNER;
215 em28xx_audio_source(dev, ainput);
216 } else {
217 switch (dev->ctl_ainput) {
218 case 0:
219 ainput = EM28XX_AUDIO_SRC_TUNER;
220 break;
221 default:
222 ainput = EM28XX_AUDIO_SRC_LINE;
223 }
224 em28xx_audio_source(dev, ainput);
225 }
226 }
227
228 /* Usage lock check functions */
229 static int res_get(struct em28xx_fh *fh)
230 {
231 struct em28xx *dev = fh->dev;
232 int rc = 0;
233
234 /* This instance already has stream_on */
235 if (fh->stream_on)
236 return rc;
237
238 mutex_lock(&dev->lock);
239
240 if (dev->stream_on)
241 rc = -EINVAL;
242 else {
243 dev->stream_on = 1;
244 fh->stream_on = 1;
245 }
246
247 mutex_unlock(&dev->lock);
248 return rc;
249 }
250
251 static int res_check(struct em28xx_fh *fh)
252 {
253 return (fh->stream_on);
254 }
255
256 static void res_free(struct em28xx_fh *fh)
257 {
258 struct em28xx *dev = fh->dev;
259
260 mutex_lock(&dev->lock);
261 fh->stream_on = 0;
262 dev->stream_on = 0;
263 mutex_unlock(&dev->lock);
264 }
265
266 /*
267 * em28xx_v4l2_open()
268 * inits the device and starts isoc transfer
269 */
270 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
271 {
272 int minor = iminor(inode);
273 int errCode = 0;
274 struct em28xx *h,*dev = NULL;
275 struct em28xx_fh *fh;
276
277 list_for_each_entry(h, &em28xx_devlist, devlist) {
278 if (h->vdev->minor == minor) {
279 dev = h;
280 dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
281 }
282 if (h->vbi_dev->minor == minor) {
283 dev = h;
284 dev->type = V4L2_BUF_TYPE_VBI_CAPTURE;
285 }
286 }
287 if (NULL == dev)
288 return -ENODEV;
289
290 em28xx_videodbg("open minor=%d type=%s users=%d\n",
291 minor,v4l2_type_names[dev->type],dev->users);
292
293 fh = kzalloc(sizeof(struct em28xx_fh), GFP_KERNEL);
294
295 if (!fh) {
296 em28xx_errdev("em28xx-video.c: Out of memory?!\n");
297 return -ENOMEM;
298 }
299 mutex_lock(&dev->lock);
300 fh->dev = dev;
301 filp->private_data = fh;
302
303 if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 0) {
304 em28xx_set_alternate(dev);
305
306 dev->width = norm_maxw(dev);
307 dev->height = norm_maxh(dev);
308 dev->frame_size = dev->width * dev->height * 2;
309 dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
310 dev->bytesperline = dev->width * 2;
311 dev->hscale = 0;
312 dev->vscale = 0;
313
314 em28xx_capture_start(dev, 1);
315 em28xx_resolution_set(dev);
316
317
318 /* start the transfer */
319 errCode = em28xx_init_isoc(dev);
320 if (errCode)
321 goto err;
322
323 em28xx_empty_framequeues(dev);
324 }
325
326 dev->users++;
327
328 err:
329 mutex_unlock(&dev->lock);
330 return errCode;
331 }
332
333 /*
334 * em28xx_realease_resources()
335 * unregisters the v4l2,i2c and usb devices
336 * called when the device gets disconected or at module unload
337 */
338 static void em28xx_release_resources(struct em28xx *dev)
339 {
340
341 /*FIXME: I2C IR should be disconnected */
342
343 em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
344 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
345 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
346 list_del(&dev->devlist);
347 video_unregister_device(dev->vdev);
348 video_unregister_device(dev->vbi_dev);
349 em28xx_i2c_unregister(dev);
350 usb_put_dev(dev->udev);
351
352
353 /* Mark device as unused */
354 em28xx_devused&=~(1<<dev->devno);
355 }
356
357 /*
358 * em28xx_v4l2_close()
359 * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
360 */
361 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
362 {
363 struct em28xx_fh *fh = filp->private_data;
364 struct em28xx *dev = fh->dev;
365 int errCode;
366
367 em28xx_videodbg("users=%d\n", dev->users);
368
369
370 if (res_check(fh))
371 res_free(fh);
372
373 mutex_lock(&dev->lock);
374
375 if (dev->users == 1) {
376 em28xx_uninit_isoc(dev);
377 em28xx_release_buffers(dev);
378 dev->io = IO_NONE;
379
380 /* the device is already disconnect,
381 free the remaining resources */
382 if (dev->state & DEV_DISCONNECTED) {
383 em28xx_release_resources(dev);
384 mutex_unlock(&dev->lock);
385 kfree(dev);
386 return 0;
387 }
388
389 /* set alternate 0 */
390 dev->alt = 0;
391 em28xx_videodbg("setting alternate 0\n");
392 errCode = usb_set_interface(dev->udev, 0, 0);
393 if (errCode < 0) {
394 em28xx_errdev("cannot change alternate number to "
395 "0 (error=%i)\n", errCode);
396 }
397 }
398 kfree(fh);
399 dev->users--;
400 wake_up_interruptible_nr(&dev->open, 1);
401 mutex_unlock(&dev->lock);
402 return 0;
403 }
404
405 /*
406 * em28xx_v4l2_read()
407 * will allocate buffers when called for the first time
408 */
409 static ssize_t
410 em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
411 loff_t * f_pos)
412 {
413 struct em28xx_frame_t *f, *i;
414 unsigned long lock_flags;
415 int ret = 0;
416 struct em28xx_fh *fh = filp->private_data;
417 struct em28xx *dev = fh->dev;
418
419
420 if (unlikely(res_get(fh) < 0))
421 return -EBUSY;
422
423 mutex_lock(&dev->lock);
424
425 if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
426 em28xx_videodbg("V4l2_Buf_type_videocapture is set\n");
427
428 if (dev->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
429 em28xx_videodbg("V4L2_BUF_TYPE_VBI_CAPTURE is set\n");
430 em28xx_videodbg("not supported yet! ...\n");
431 if (copy_to_user(buf, "", 1)) {
432 mutex_unlock(&dev->lock);
433 return -EFAULT;
434 }
435 mutex_unlock(&dev->lock);
436 return (1);
437 }
438 if (dev->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
439 em28xx_videodbg("V4L2_BUF_TYPE_SLICED_VBI_CAPTURE is set\n");
440 em28xx_videodbg("not supported yet! ...\n");
441 if (copy_to_user(buf, "", 1)) {
442 mutex_unlock(&dev->lock);
443 return -EFAULT;
444 }
445 mutex_unlock(&dev->lock);
446 return (1);
447 }
448
449 if (dev->state & DEV_DISCONNECTED) {
450 em28xx_videodbg("device not present\n");
451 mutex_unlock(&dev->lock);
452 return -ENODEV;
453 }
454
455 if (dev->state & DEV_MISCONFIGURED) {
456 em28xx_videodbg("device misconfigured; close and open it again\n");
457 mutex_unlock(&dev->lock);
458 return -EIO;
459 }
460
461 if (dev->io == IO_MMAP) {
462 em28xx_videodbg ("IO method is set to mmap; close and open"
463 " the device again to choose the read method\n");
464 mutex_unlock(&dev->lock);
465 return -EINVAL;
466 }
467
468 if (dev->io == IO_NONE) {
469 if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
470 em28xx_errdev("read failed, not enough memory\n");
471 mutex_unlock(&dev->lock);
472 return -ENOMEM;
473 }
474 dev->io = IO_READ;
475 dev->stream = STREAM_ON;
476 em28xx_queue_unusedframes(dev);
477 }
478
479 if (!count) {
480 mutex_unlock(&dev->lock);
481 return 0;
482 }
483
484 if (list_empty(&dev->outqueue)) {
485 if (filp->f_flags & O_NONBLOCK) {
486 mutex_unlock(&dev->lock);
487 return -EAGAIN;
488 }
489 ret = wait_event_interruptible
490 (dev->wait_frame,
491 (!list_empty(&dev->outqueue)) ||
492 (dev->state & DEV_DISCONNECTED));
493 if (ret) {
494 mutex_unlock(&dev->lock);
495 return ret;
496 }
497 if (dev->state & DEV_DISCONNECTED) {
498 mutex_unlock(&dev->lock);
499 return -ENODEV;
500 }
501 }
502
503 f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);
504
505 spin_lock_irqsave(&dev->queue_lock, lock_flags);
506 list_for_each_entry(i, &dev->outqueue, frame)
507 i->state = F_UNUSED;
508 INIT_LIST_HEAD(&dev->outqueue);
509 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
510
511 em28xx_queue_unusedframes(dev);
512
513 if (count > f->buf.length)
514 count = f->buf.length;
515
516 if (copy_to_user(buf, f->bufmem, count)) {
517 mutex_unlock(&dev->lock);
518 return -EFAULT;
519 }
520 *f_pos += count;
521
522 mutex_unlock(&dev->lock);
523
524 return count;
525 }
526
527 /*
528 * em28xx_v4l2_poll()
529 * will allocate buffers when called for the first time
530 */
531 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
532 {
533 unsigned int mask = 0;
534 struct em28xx_fh *fh = filp->private_data;
535 struct em28xx *dev = fh->dev;
536
537 if (unlikely(res_get(fh) < 0))
538 return POLLERR;
539
540 mutex_lock(&dev->lock);
541
542 if (dev->state & DEV_DISCONNECTED) {
543 em28xx_videodbg("device not present\n");
544 } else if (dev->state & DEV_MISCONFIGURED) {
545 em28xx_videodbg("device is misconfigured; close and open it again\n");
546 } else {
547 if (dev->io == IO_NONE) {
548 if (!em28xx_request_buffers
549 (dev, EM28XX_NUM_READ_FRAMES)) {
550 em28xx_warn
551 ("poll() failed, not enough memory\n");
552 } else {
553 dev->io = IO_READ;
554 dev->stream = STREAM_ON;
555 }
556 }
557
558 if (dev->io == IO_READ) {
559 em28xx_queue_unusedframes(dev);
560 poll_wait(filp, &dev->wait_frame, wait);
561
562 if (!list_empty(&dev->outqueue))
563 mask |= POLLIN | POLLRDNORM;
564
565 mutex_unlock(&dev->lock);
566
567 return mask;
568 }
569 }
570
571 mutex_unlock(&dev->lock);
572 return POLLERR;
573 }
574
575 /*
576 * em28xx_vm_open()
577 */
578 static void em28xx_vm_open(struct vm_area_struct *vma)
579 {
580 struct em28xx_frame_t *f = vma->vm_private_data;
581 f->vma_use_count++;
582 }
583
584 /*
585 * em28xx_vm_close()
586 */
587 static void em28xx_vm_close(struct vm_area_struct *vma)
588 {
589 /* NOTE: buffers are not freed here */
590 struct em28xx_frame_t *f = vma->vm_private_data;
591
592 if (f->vma_use_count)
593 f->vma_use_count--;
594 }
595
596 static struct vm_operations_struct em28xx_vm_ops = {
597 .open = em28xx_vm_open,
598 .close = em28xx_vm_close,
599 };
600
601 /*
602 * em28xx_v4l2_mmap()
603 */
604 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
605 {
606 struct em28xx_fh *fh = filp->private_data;
607 struct em28xx *dev = fh->dev;
608 unsigned long size = vma->vm_end - vma->vm_start;
609 unsigned long start = vma->vm_start;
610 void *pos;
611 u32 i;
612
613 if (unlikely(res_get(fh) < 0))
614 return -EBUSY;
615
616 mutex_lock(&dev->lock);
617
618 if (dev->state & DEV_DISCONNECTED) {
619 em28xx_videodbg("mmap: device not present\n");
620 mutex_unlock(&dev->lock);
621 return -ENODEV;
622 }
623
624 if (dev->state & DEV_MISCONFIGURED) {
625 em28xx_videodbg ("mmap: Device is misconfigured; close and "
626 "open it again\n");
627 mutex_unlock(&dev->lock);
628 return -EIO;
629 }
630
631 if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
632 size != PAGE_ALIGN(dev->frame[0].buf.length)) {
633 mutex_unlock(&dev->lock);
634 return -EINVAL;
635 }
636
637 for (i = 0; i < dev->num_frames; i++) {
638 if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
639 break;
640 }
641 if (i == dev->num_frames) {
642 em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
643 mutex_unlock(&dev->lock);
644 return -EINVAL;
645 }
646
647 /* VM_IO is eventually going to replace PageReserved altogether */
648 vma->vm_flags |= VM_IO;
649 vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
650
651 pos = dev->frame[i].bufmem;
652 while (size > 0) { /* size is page-aligned */
653 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
654 em28xx_videodbg("mmap: vm_insert_page failed\n");
655 mutex_unlock(&dev->lock);
656 return -EAGAIN;
657 }
658 start += PAGE_SIZE;
659 pos += PAGE_SIZE;
660 size -= PAGE_SIZE;
661 }
662
663 vma->vm_ops = &em28xx_vm_ops;
664 vma->vm_private_data = &dev->frame[i];
665
666 em28xx_vm_open(vma);
667 mutex_unlock(&dev->lock);
668 return 0;
669 }
670
671 /*
672 * em28xx_get_ctrl()
673 * return the current saturation, brightness or contrast, mute state
674 */
675 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
676 {
677 switch (ctrl->id) {
678 case V4L2_CID_AUDIO_MUTE:
679 ctrl->value = dev->mute;
680 return 0;
681 case V4L2_CID_AUDIO_VOLUME:
682 ctrl->value = dev->volume;
683 return 0;
684 default:
685 return -EINVAL;
686 }
687 }
688
689 /*
690 * em28xx_set_ctrl()
691 * mute or set new saturation, brightness or contrast
692 */
693 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
694 {
695 switch (ctrl->id) {
696 case V4L2_CID_AUDIO_MUTE:
697 if (ctrl->value != dev->mute) {
698 dev->mute = ctrl->value;
699 em28xx_audio_usb_mute(dev, ctrl->value);
700 return em28xx_audio_analog_set(dev);
701 }
702 return 0;
703 case V4L2_CID_AUDIO_VOLUME:
704 dev->volume = ctrl->value;
705 return em28xx_audio_analog_set(dev);
706 default:
707 return -EINVAL;
708 }
709 }
710
711 /*
712 * em28xx_stream_interrupt()
713 * stops streaming
714 */
715 static int em28xx_stream_interrupt(struct em28xx *dev)
716 {
717 int ret = 0;
718
719 /* stop reading from the device */
720
721 dev->stream = STREAM_INTERRUPT;
722 ret = wait_event_timeout(dev->wait_stream,
723 (dev->stream == STREAM_OFF) ||
724 (dev->state & DEV_DISCONNECTED),
725 EM28XX_URB_TIMEOUT);
726 if (dev->state & DEV_DISCONNECTED)
727 return -ENODEV;
728 else if (ret) {
729 dev->state |= DEV_MISCONFIGURED;
730 em28xx_videodbg("device is misconfigured; close and "
731 "open /dev/video%d again\n",
732 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
733 return ret;
734 }
735
736 return 0;
737 }
738
739 static int em28xx_set_norm(struct em28xx *dev, int width, int height)
740 {
741 unsigned int hscale, vscale;
742 unsigned int maxh, maxw;
743
744 maxw = norm_maxw(dev);
745 maxh = norm_maxh(dev);
746
747 /* width must even because of the YUYV format */
748 /* height must be even because of interlacing */
749 height &= 0xfffe;
750 width &= 0xfffe;
751
752 if (height < 32)
753 height = 32;
754 if (height > maxh)
755 height = maxh;
756 if (width < 48)
757 width = 48;
758 if (width > maxw)
759 width = maxw;
760
761 if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
762 hscale = 0x3fff;
763 width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
764
765 if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
766 vscale = 0x3fff;
767 height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
768
769 /* set new image size */
770 dev->width = width;
771 dev->height = height;
772 dev->frame_size = dev->width * dev->height * 2;
773 dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
774 dev->bytesperline = dev->width * 2;
775 dev->hscale = hscale;
776 dev->vscale = vscale;
777
778 em28xx_resolution_set(dev);
779
780 return 0;
781 }
782
783 static int em28xx_get_fmt(struct em28xx *dev, struct v4l2_format *format)
784 {
785 em28xx_videodbg("VIDIOC_G_FMT: type=%s\n",
786 (format->type ==V4L2_BUF_TYPE_VIDEO_CAPTURE) ?
787 "V4L2_BUF_TYPE_VIDEO_CAPTURE" :
788 (format->type ==V4L2_BUF_TYPE_VBI_CAPTURE) ?
789 "V4L2_BUF_TYPE_VBI_CAPTURE" :
790 (format->type ==V4L2_CAP_SLICED_VBI_CAPTURE) ?
791 "V4L2_BUF_TYPE_SLICED_VBI_CAPTURE " :
792 "not supported");
793
794 switch (format->type) {
795 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
796 {
797 format->fmt.pix.width = dev->width;
798 format->fmt.pix.height = dev->height;
799 format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
800 format->fmt.pix.bytesperline = dev->bytesperline;
801 format->fmt.pix.sizeimage = dev->frame_size;
802 format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
803 format->fmt.pix.field = dev->interlaced ? V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP; /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
804
805 em28xx_videodbg("VIDIOC_G_FMT: %dx%d\n", dev->width,
806 dev->height);
807 break;
808 }
809
810 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
811 {
812 format->fmt.sliced.service_set=0;
813
814 em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);
815
816 if (format->fmt.sliced.service_set==0)
817 return -EINVAL;
818
819 break;
820 }
821
822 default:
823 return -EINVAL;
824 }
825 return (0);
826 }
827
828 static int em28xx_set_fmt(struct em28xx *dev, unsigned int cmd, struct v4l2_format *format)
829 {
830 u32 i;
831 int ret = 0;
832 int width = format->fmt.pix.width;
833 int height = format->fmt.pix.height;
834 unsigned int hscale, vscale;
835 unsigned int maxh, maxw;
836
837 maxw = norm_maxw(dev);
838 maxh = norm_maxh(dev);
839
840 em28xx_videodbg("%s: type=%s\n",
841 cmd == VIDIOC_TRY_FMT ?
842 "VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
843 format->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ?
844 "V4L2_BUF_TYPE_VIDEO_CAPTURE" :
845 format->type == V4L2_BUF_TYPE_VBI_CAPTURE ?
846 "V4L2_BUF_TYPE_VBI_CAPTURE " :
847 "not supported");
848
849 if (format->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
850 em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);
851
852 if (format->fmt.sliced.service_set==0)
853 return -EINVAL;
854
855 return 0;
856 }
857
858
859 if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
860 return -EINVAL;
861
862 em28xx_videodbg("%s: requested %dx%d\n",
863 cmd == VIDIOC_TRY_FMT ?
864 "VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
865 format->fmt.pix.width, format->fmt.pix.height);
866
867 /* FIXME: Move some code away from here */
868 /* width must even because of the YUYV format */
869 /* height must be even because of interlacing */
870 height &= 0xfffe;
871 width &= 0xfffe;
872
873 if (height < 32)
874 height = 32;
875 if (height > maxh)
876 height = maxh;
877 if (width < 48)
878 width = 48;
879 if (width > maxw)
880 width = maxw;
881
882 if(dev->is_em2800){
883 /* the em2800 can only scale down to 50% */
884 if(height % (maxh / 2))
885 height=maxh;
886 if(width % (maxw / 2))
887 width=maxw;
888 /* according to empiatech support */
889 /* the MaxPacketSize is to small to support */
890 /* framesizes larger than 640x480 @ 30 fps */
891 /* or 640x576 @ 25 fps. As this would cut */
892 /* of a part of the image we prefer */
893 /* 360x576 or 360x480 for now */
894 if(width == maxw && height == maxh)
895 width /= 2;
896 }
897
898 if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
899 hscale = 0x3fff;
900
901 width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
902
903 if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
904 vscale = 0x3fff;
905
906 height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
907
908 format->fmt.pix.width = width;
909 format->fmt.pix.height = height;
910 format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
911 format->fmt.pix.bytesperline = width * 2;
912 format->fmt.pix.sizeimage = width * 2 * height;
913 format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
914 format->fmt.pix.field = V4L2_FIELD_INTERLACED;
915
916 em28xx_videodbg("%s: returned %dx%d (%d, %d)\n",
917 cmd == VIDIOC_TRY_FMT ?
918 "VIDIOC_TRY_FMT" :"VIDIOC_S_FMT",
919 format->fmt.pix.width, format->fmt.pix.height, hscale, vscale);
920
921 if (cmd == VIDIOC_TRY_FMT)
922 return 0;
923
924 for (i = 0; i < dev->num_frames; i++)
925 if (dev->frame[i].vma_use_count) {
926 em28xx_videodbg("VIDIOC_S_FMT failed. "
927 "Unmap the buffers first.\n");
928 return -EINVAL;
929 }
930
931 /* stop io in case it is already in progress */
932 if (dev->stream == STREAM_ON) {
933 em28xx_videodbg("VIDIOC_SET_FMT: interrupting stream\n");
934 if ((ret = em28xx_stream_interrupt(dev)))
935 return ret;
936 }
937
938 em28xx_release_buffers(dev);
939 dev->io = IO_NONE;
940
941 /* set new image size */
942 dev->width = width;
943 dev->height = height;
944 dev->frame_size = dev->width * dev->height * 2;
945 dev->field_size = dev->frame_size >> 1;
946 dev->bytesperline = dev->width * 2;
947 dev->hscale = hscale;
948 dev->vscale = vscale;
949 em28xx_uninit_isoc(dev);
950 em28xx_set_alternate(dev);
951 em28xx_capture_start(dev, 1);
952 em28xx_resolution_set(dev);
953 em28xx_init_isoc(dev);
954
955 return 0;
956 }
957
958 /*
959 * em28xx_v4l2_do_ioctl()
960 * This function is _not_ called directly, but from
961 * em28xx_v4l2_ioctl. Userspace
962 * copying is done already, arg is a kernel pointer.
963 */
964 static int em28xx_do_ioctl(struct inode *inode, struct file *filp,
965 struct em28xx *dev, unsigned int cmd, void *arg,
966 v4l2_kioctl driver_ioctl)
967 {
968 struct em28xx_fh *fh = filp->private_data;
969 int ret;
970
971 switch (cmd) {
972 /* ---------- tv norms ---------- */
973 case VIDIOC_ENUMSTD:
974 {
975 struct v4l2_standard *e = arg;
976 unsigned int i;
977
978 i = e->index;
979 if (i >= TVNORMS)
980 return -EINVAL;
981 ret = v4l2_video_std_construct(e, tvnorms[e->index].id,
982 tvnorms[e->index].name);
983 e->index = i;
984 if (ret < 0)
985 return ret;
986 return 0;
987 }
988 case VIDIOC_G_STD:
989 {
990 v4l2_std_id *id = arg;
991
992 *id = dev->tvnorm->id;
993 return 0;
994 }
995 case VIDIOC_S_STD:
996 {
997 v4l2_std_id *id = arg;
998 unsigned int i;
999
1000 for (i = 0; i < TVNORMS; i++)
1001 if (*id == tvnorms[i].id)
1002 break;
1003 if (i == TVNORMS)
1004 for (i = 0; i < TVNORMS; i++)
1005 if (*id & tvnorms[i].id)
1006 break;
1007 if (i == TVNORMS)
1008 return -EINVAL;
1009
1010 mutex_lock(&dev->lock);
1011 dev->tvnorm = &tvnorms[i];
1012
1013 em28xx_set_norm(dev, dev->width, dev->height);
1014
1015 em28xx_i2c_call_clients(dev, VIDIOC_S_STD,
1016 &dev->tvnorm->id);
1017
1018 mutex_unlock(&dev->lock);
1019
1020 return 0;
1021 }
1022
1023 /* ------ input switching ---------- */
1024 case VIDIOC_ENUMINPUT:
1025 {
1026 struct v4l2_input *i = arg;
1027 unsigned int n;
1028 static const char *iname[] = {
1029 [EM28XX_VMUX_COMPOSITE1] = "Composite1",
1030 [EM28XX_VMUX_COMPOSITE2] = "Composite2",
1031 [EM28XX_VMUX_COMPOSITE3] = "Composite3",
1032 [EM28XX_VMUX_COMPOSITE4] = "Composite4",
1033 [EM28XX_VMUX_SVIDEO] = "S-Video",
1034 [EM28XX_VMUX_TELEVISION] = "Television",
1035 [EM28XX_VMUX_CABLE] = "Cable TV",
1036 [EM28XX_VMUX_DVB] = "DVB",
1037 [EM28XX_VMUX_DEBUG] = "for debug only",
1038 };
1039
1040 n = i->index;
1041 if (n >= MAX_EM28XX_INPUT)
1042 return -EINVAL;
1043 if (0 == INPUT(n)->type)
1044 return -EINVAL;
1045 memset(i, 0, sizeof(*i));
1046 i->index = n;
1047 i->type = V4L2_INPUT_TYPE_CAMERA;
1048 strcpy(i->name, iname[INPUT(n)->type]);
1049 if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
1050 (EM28XX_VMUX_CABLE == INPUT(n)->type))
1051 i->type = V4L2_INPUT_TYPE_TUNER;
1052 for (n = 0; n < ARRAY_SIZE(tvnorms); n++)
1053 i->std |= tvnorms[n].id;
1054 return 0;
1055 }
1056 case VIDIOC_G_INPUT:
1057 {
1058 int *i = arg;
1059 *i = dev->ctl_input;
1060
1061 return 0;
1062 }
1063 case VIDIOC_S_INPUT:
1064 {
1065 int *index = arg;
1066
1067 if (*index >= MAX_EM28XX_INPUT)
1068 return -EINVAL;
1069 if (0 == INPUT(*index)->type)
1070 return -EINVAL;
1071
1072 mutex_lock(&dev->lock);
1073 video_mux(dev, *index);
1074 mutex_unlock(&dev->lock);
1075
1076 return 0;
1077 }
1078 case VIDIOC_G_AUDIO:
1079 {
1080 struct v4l2_audio *a = arg;
1081 unsigned int index = a->index;
1082
1083 if (a->index > 1)
1084 return -EINVAL;
1085 memset(a, 0, sizeof(*a));
1086 index = dev->ctl_ainput;
1087
1088 if (index == 0) {
1089 strcpy(a->name, "Television");
1090 } else {
1091 strcpy(a->name, "Line In");
1092 }
1093 a->capability = V4L2_AUDCAP_STEREO;
1094 a->index = index;
1095 return 0;
1096 }
1097 case VIDIOC_S_AUDIO:
1098 {
1099 struct v4l2_audio *a = arg;
1100
1101 if (a->index != dev->ctl_ainput)
1102 return -EINVAL;
1103
1104 return 0;
1105 }
1106
1107 /* --- controls ---------------------------------------------- */
1108 case VIDIOC_QUERYCTRL:
1109 {
1110 struct v4l2_queryctrl *qc = arg;
1111 int i, id=qc->id;
1112
1113 memset(qc,0,sizeof(*qc));
1114 qc->id=id;
1115
1116 if (!dev->has_msp34xx) {
1117 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1118 if (qc->id && qc->id == em28xx_qctrl[i].id) {
1119 memcpy(qc, &(em28xx_qctrl[i]),
1120 sizeof(*qc));
1121 return 0;
1122 }
1123 }
1124 }
1125 mutex_lock(&dev->lock);
1126 em28xx_i2c_call_clients(dev,cmd,qc);
1127 mutex_unlock(&dev->lock);
1128 if (qc->type)
1129 return 0;
1130 else
1131 return -EINVAL;
1132 }
1133 case VIDIOC_G_CTRL:
1134 {
1135 struct v4l2_control *ctrl = arg;
1136 int retval=-EINVAL;
1137
1138 if (!dev->has_msp34xx)
1139 retval=em28xx_get_ctrl(dev, ctrl);
1140 if (retval==-EINVAL) {
1141 mutex_lock(&dev->lock);
1142 em28xx_i2c_call_clients(dev,cmd,arg);
1143 mutex_unlock(&dev->lock);
1144 return 0;
1145 } else return retval;
1146 }
1147 case VIDIOC_S_CTRL:
1148 {
1149 struct v4l2_control *ctrl = arg;
1150 u8 i;
1151 mutex_lock(&dev->lock);
1152
1153 if (!dev->has_msp34xx){
1154 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1155 if (ctrl->id == em28xx_qctrl[i].id) {
1156 int retval=-EINVAL;
1157 if (ctrl->value <
1158 em28xx_qctrl[i].minimum
1159 || ctrl->value >
1160 em28xx_qctrl[i].maximum)
1161 return -ERANGE;
1162 retval = em28xx_set_ctrl(dev, ctrl);
1163 mutex_unlock(&dev->lock);
1164 return retval;
1165 }
1166 }
1167 }
1168
1169 em28xx_i2c_call_clients(dev,cmd,arg);
1170 mutex_unlock(&dev->lock);
1171 return 0;
1172 }
1173 /* --- tuner ioctls ------------------------------------------ */
1174 case VIDIOC_G_TUNER:
1175 {
1176 struct v4l2_tuner *t = arg;
1177
1178 if (0 != t->index)
1179 return -EINVAL;
1180
1181 memset(t, 0, sizeof(*t));
1182 strcpy(t->name, "Tuner");
1183 mutex_lock(&dev->lock);
1184 /* let clients fill in the remainder of this struct */
1185 em28xx_i2c_call_clients(dev, cmd, t);
1186 mutex_unlock(&dev->lock);
1187 em28xx_videodbg("VIDIO_G_TUNER: signal=%x, afc=%x\n", t->signal,
1188 t->afc);
1189 return 0;
1190 }
1191 case VIDIOC_S_TUNER:
1192 {
1193 struct v4l2_tuner *t = arg;
1194
1195 if (0 != t->index)
1196 return -EINVAL;
1197 mutex_lock(&dev->lock);
1198 /* let clients handle this */
1199 em28xx_i2c_call_clients(dev, cmd, t);
1200 mutex_unlock(&dev->lock);
1201 return 0;
1202 }
1203 case VIDIOC_G_FREQUENCY:
1204 {
1205 struct v4l2_frequency *f = arg;
1206
1207 memset(f, 0, sizeof(*f));
1208 f->type = V4L2_TUNER_ANALOG_TV;
1209 f->frequency = dev->ctl_freq;
1210
1211 return 0;
1212 }
1213 case VIDIOC_S_FREQUENCY:
1214 {
1215 struct v4l2_frequency *f = arg;
1216
1217 if (0 != f->tuner)
1218 return -EINVAL;
1219
1220 if (V4L2_TUNER_ANALOG_TV != f->type)
1221 return -EINVAL;
1222
1223 mutex_lock(&dev->lock);
1224 dev->ctl_freq = f->frequency;
1225 em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
1226 mutex_unlock(&dev->lock);
1227 return 0;
1228 }
1229 case VIDIOC_CROPCAP:
1230 {
1231 struct v4l2_cropcap *cc = arg;
1232
1233 if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1234 return -EINVAL;
1235 cc->bounds.left = 0;
1236 cc->bounds.top = 0;
1237 cc->bounds.width = dev->width;
1238 cc->bounds.height = dev->height;
1239 cc->defrect = cc->bounds;
1240 cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
1241 cc->pixelaspect.denominator = 59;
1242 return 0;
1243 }
1244 case VIDIOC_STREAMON:
1245 {
1246 int *type = arg;
1247
1248 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1249 || dev->io != IO_MMAP)
1250 return -EINVAL;
1251
1252 if (list_empty(&dev->inqueue))
1253 return -EINVAL;
1254
1255 if (unlikely(res_get(fh) < 0))
1256 return -EBUSY;
1257
1258 dev->stream = STREAM_ON; /* FIXME: Start video capture here? */
1259
1260 em28xx_videodbg("VIDIOC_STREAMON: starting stream\n");
1261
1262 return 0;
1263 }
1264 case VIDIOC_STREAMOFF:
1265 {
1266 int *type = arg;
1267 int ret;
1268
1269 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1270 || dev->io != IO_MMAP)
1271 return -EINVAL;
1272
1273 mutex_lock(&dev->lock);
1274 if (dev->stream == STREAM_ON) {
1275 em28xx_videodbg ("VIDIOC_STREAMOFF: interrupting stream\n");
1276 if ((ret = em28xx_stream_interrupt(dev))){
1277 mutex_unlock(&dev->lock);
1278 return ret;
1279 }
1280 }
1281
1282 em28xx_empty_framequeues(dev);
1283 mutex_unlock(&dev->lock);
1284
1285 return 0;
1286 }
1287 default:
1288 return v4l_compat_translate_ioctl(inode, filp, cmd, arg,
1289 driver_ioctl);
1290 }
1291 return 0;
1292 }
1293
1294 /*
1295 * em28xx_v4l2_do_ioctl()
1296 * This function is _not_ called directly, but from
1297 * em28xx_v4l2_ioctl. Userspace
1298 * copying is done already, arg is a kernel pointer.
1299 */
1300 static int em28xx_video_do_ioctl(struct inode *inode, struct file *filp,
1301 unsigned int cmd, void *arg)
1302 {
1303 struct em28xx_fh *fh = filp->private_data;
1304 struct em28xx *dev = fh->dev;
1305
1306 if (!dev)
1307 return -ENODEV;
1308
1309 if (video_debug > 1)
1310 v4l_print_ioctl(dev->name,cmd);
1311
1312 switch (cmd) {
1313
1314 /* --- capabilities ------------------------------------------ */
1315 case VIDIOC_QUERYCAP:
1316 {
1317 struct v4l2_capability *cap = arg;
1318
1319 memset(cap, 0, sizeof(*cap));
1320 strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1321 strlcpy(cap->card, em28xx_boards[dev->model].name,
1322 sizeof(cap->card));
1323 strlcpy(cap->bus_info, dev->udev->dev.bus_id,
1324 sizeof(cap->bus_info));
1325 cap->version = EM28XX_VERSION_CODE;
1326 cap->capabilities =
1327 V4L2_CAP_SLICED_VBI_CAPTURE |
1328 V4L2_CAP_VIDEO_CAPTURE |
1329 V4L2_CAP_AUDIO |
1330 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1331 if (dev->has_tuner)
1332 cap->capabilities |= V4L2_CAP_TUNER;
1333 return 0;
1334 }
1335 /* --- capture ioctls ---------------------------------------- */
1336 case VIDIOC_ENUM_FMT:
1337 {
1338 struct v4l2_fmtdesc *fmtd = arg;
1339
1340 if (fmtd->index != 0)
1341 return -EINVAL;
1342 memset(fmtd, 0, sizeof(*fmtd));
1343 fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1344 strcpy(fmtd->description, "Packed YUY2");
1345 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
1346 memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
1347 return 0;
1348 }
1349 case VIDIOC_G_FMT:
1350 {
1351 int retval;
1352 mutex_lock(&dev->lock);
1353 retval = em28xx_get_fmt(dev, (struct v4l2_format *) arg);
1354 mutex_unlock(&dev->lock);
1355 return retval;
1356
1357 }
1358 case VIDIOC_TRY_FMT:
1359 case VIDIOC_S_FMT:
1360 {
1361 int retval;
1362 mutex_lock(&dev->lock);
1363 retval = em28xx_set_fmt(dev, cmd, (struct v4l2_format *)arg);
1364 mutex_unlock(&dev->lock);
1365 return retval;
1366 }
1367
1368 case VIDIOC_REQBUFS:
1369 {
1370 struct v4l2_requestbuffers *rb = arg;
1371 u32 i;
1372 int ret;
1373
1374 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1375 rb->memory != V4L2_MEMORY_MMAP)
1376 return -EINVAL;
1377
1378 if (dev->io == IO_READ) {
1379 em28xx_videodbg ("method is set to read;"
1380 " close and open the device again to"
1381 " choose the mmap I/O method\n");
1382 return -EINVAL;
1383 }
1384
1385 for (i = 0; i < dev->num_frames; i++)
1386 if (dev->frame[i].vma_use_count) {
1387 em28xx_videodbg ("VIDIOC_REQBUFS failed; previous buffers are still mapped\n");
1388 return -EINVAL;
1389 }
1390
1391 mutex_lock(&dev->lock);
1392 if (dev->stream == STREAM_ON) {
1393 em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream\n");
1394 if ((ret = em28xx_stream_interrupt(dev))){
1395 mutex_unlock(&dev->lock);
1396 return ret;
1397 }
1398 }
1399
1400 em28xx_empty_framequeues(dev);
1401
1402 em28xx_release_buffers(dev);
1403 if (rb->count)
1404 rb->count =
1405 em28xx_request_buffers(dev, rb->count);
1406
1407 dev->frame_current = NULL;
1408
1409 em28xx_videodbg ("VIDIOC_REQBUFS: setting io method to mmap: num bufs %i\n",
1410 rb->count);
1411 dev->io = rb->count ? IO_MMAP : IO_NONE;
1412 mutex_unlock(&dev->lock);
1413 return 0;
1414 }
1415 case VIDIOC_QUERYBUF:
1416 {
1417 struct v4l2_buffer *b = arg;
1418
1419 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1420 b->index >= dev->num_frames || dev->io != IO_MMAP)
1421 return -EINVAL;
1422
1423 memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1424
1425 if (dev->frame[b->index].vma_use_count) {
1426 b->flags |= V4L2_BUF_FLAG_MAPPED;
1427 }
1428 if (dev->frame[b->index].state == F_DONE)
1429 b->flags |= V4L2_BUF_FLAG_DONE;
1430 else if (dev->frame[b->index].state != F_UNUSED)
1431 b->flags |= V4L2_BUF_FLAG_QUEUED;
1432 return 0;
1433 }
1434 case VIDIOC_QBUF:
1435 {
1436 struct v4l2_buffer *b = arg;
1437 unsigned long lock_flags;
1438
1439 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1440 b->index >= dev->num_frames || dev->io != IO_MMAP) {
1441 return -EINVAL;
1442 }
1443
1444 if (dev->frame[b->index].state != F_UNUSED) {
1445 return -EAGAIN;
1446 }
1447 dev->frame[b->index].state = F_QUEUED;
1448
1449 /* add frame to fifo */
1450 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1451 list_add_tail(&dev->frame[b->index].frame,
1452 &dev->inqueue);
1453 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1454
1455 return 0;
1456 }
1457 case VIDIOC_DQBUF:
1458 {
1459 struct v4l2_buffer *b = arg;
1460 struct em28xx_frame_t *f;
1461 unsigned long lock_flags;
1462 int ret = 0;
1463
1464 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1465 || dev->io != IO_MMAP)
1466 return -EINVAL;
1467
1468 if (list_empty(&dev->outqueue)) {
1469 if (dev->stream == STREAM_OFF)
1470 return -EINVAL;
1471 if (filp->f_flags & O_NONBLOCK)
1472 return -EAGAIN;
1473 ret = wait_event_interruptible
1474 (dev->wait_frame,
1475 (!list_empty(&dev->outqueue)) ||
1476 (dev->state & DEV_DISCONNECTED));
1477 if (ret)
1478 return ret;
1479 if (dev->state & DEV_DISCONNECTED)
1480 return -ENODEV;
1481 }
1482
1483 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1484 f = list_entry(dev->outqueue.next,
1485 struct em28xx_frame_t, frame);
1486 list_del(dev->outqueue.next);
1487 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1488
1489 f->state = F_UNUSED;
1490 memcpy(b, &f->buf, sizeof(*b));
1491
1492 if (f->vma_use_count)
1493 b->flags |= V4L2_BUF_FLAG_MAPPED;
1494
1495 return 0;
1496 }
1497 default:
1498 return em28xx_do_ioctl(inode, filp, dev, cmd, arg,
1499 em28xx_video_do_ioctl);
1500 }
1501 return 0;
1502 }
1503
1504 /*
1505 * em28xx_v4l2_ioctl()
1506 * handle v4l2 ioctl the main action happens in em28xx_v4l2_do_ioctl()
1507 */
1508 static int em28xx_v4l2_ioctl(struct inode *inode, struct file *filp,
1509 unsigned int cmd, unsigned long arg)
1510 {
1511 int ret = 0;
1512 struct em28xx_fh *fh = filp->private_data;
1513 struct em28xx *dev = fh->dev;
1514
1515 if (dev->state & DEV_DISCONNECTED) {
1516 em28xx_errdev("v4l2 ioctl: device not present\n");
1517 return -ENODEV;
1518 }
1519
1520 if (dev->state & DEV_MISCONFIGURED) {
1521 em28xx_errdev
1522 ("v4l2 ioctl: device is misconfigured; close and open it again\n");
1523 return -EIO;
1524 }
1525
1526 ret = video_usercopy(inode, filp, cmd, arg, em28xx_video_do_ioctl);
1527
1528 return ret;
1529 }
1530
1531 static const struct file_operations em28xx_v4l_fops = {
1532 .owner = THIS_MODULE,
1533 .open = em28xx_v4l2_open,
1534 .release = em28xx_v4l2_close,
1535 .ioctl = em28xx_v4l2_ioctl,
1536 .read = em28xx_v4l2_read,
1537 .poll = em28xx_v4l2_poll,
1538 .mmap = em28xx_v4l2_mmap,
1539 .llseek = no_llseek,
1540 .compat_ioctl = v4l_compat_ioctl32,
1541
1542 };
1543
1544 /******************************** usb interface *****************************************/
1545
1546 /*
1547 * em28xx_init_dev()
1548 * allocates and inits the device structs, registers i2c bus and v4l device
1549 */
1550 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1551 int minor)
1552 {
1553 struct em28xx *dev = *devhandle;
1554 int retval = -ENOMEM;
1555 int errCode, i;
1556 unsigned int maxh, maxw;
1557
1558 dev->udev = udev;
1559 mutex_init(&dev->lock);
1560 spin_lock_init(&dev->queue_lock);
1561 init_waitqueue_head(&dev->open);
1562 init_waitqueue_head(&dev->wait_frame);
1563 init_waitqueue_head(&dev->wait_stream);
1564
1565 dev->em28xx_write_regs = em28xx_write_regs;
1566 dev->em28xx_read_reg = em28xx_read_reg;
1567 dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1568 dev->em28xx_write_regs_req = em28xx_write_regs_req;
1569 dev->em28xx_read_reg_req = em28xx_read_reg_req;
1570 dev->is_em2800 = em28xx_boards[dev->model].is_em2800;
1571
1572 /* setup video picture settings for saa7113h */
1573 memset(&dev->vpic, 0, sizeof(dev->vpic));
1574 dev->vpic.colour = 128 << 8;
1575 dev->vpic.hue = 128 << 8;
1576 dev->vpic.brightness = 128 << 8;
1577 dev->vpic.contrast = 192 << 8;
1578 dev->vpic.whiteness = 128 << 8; /* This one isn't used */
1579 dev->vpic.depth = 16;
1580 dev->vpic.palette = VIDEO_PALETTE_YUV422;
1581
1582 em28xx_pre_card_setup(dev);
1583
1584 errCode = em28xx_config(dev);
1585 if (errCode) {
1586 em28xx_errdev("error configuring device\n");
1587 em28xx_devused &= ~(1<<dev->devno);
1588 kfree(dev);
1589 return -ENOMEM;
1590 }
1591
1592 /* register i2c bus */
1593 em28xx_i2c_register(dev);
1594
1595 /* Do board specific init and eeprom reading */
1596 em28xx_card_setup(dev);
1597
1598 /* configure the device */
1599 em28xx_config_i2c(dev);
1600
1601 for (i = 0; i < TVNORMS; i++)
1602 if (em28xx_boards[dev->model].norm == tvnorms[i].mode)
1603 break;
1604 if (i == TVNORMS)
1605 i = 0;
1606
1607 dev->tvnorm = &tvnorms[i]; /* set default norm */
1608
1609 em28xx_videodbg("tvnorm=%s\n", dev->tvnorm->name);
1610
1611 maxw = norm_maxw(dev);
1612 maxh = norm_maxh(dev);
1613
1614 /* set default image size */
1615 dev->width = maxw;
1616 dev->height = maxh;
1617 dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1618 dev->field_size = dev->width * dev->height;
1619 dev->frame_size =
1620 dev->interlaced ? dev->field_size << 1 : dev->field_size;
1621 dev->bytesperline = dev->width * 2;
1622 dev->hscale = 0;
1623 dev->vscale = 0;
1624 dev->ctl_input = 2;
1625
1626 errCode = em28xx_config(dev);
1627
1628 /* allocate and fill v4l2 device struct */
1629 dev->vdev = video_device_alloc();
1630 if (NULL == dev->vdev) {
1631 em28xx_errdev("cannot allocate video_device.\n");
1632 em28xx_devused&=~(1<<dev->devno);
1633 kfree(dev);
1634 return -ENOMEM;
1635 }
1636
1637 dev->vbi_dev = video_device_alloc();
1638 if (NULL == dev->vbi_dev) {
1639 em28xx_errdev("cannot allocate video_device.\n");
1640 kfree(dev->vdev);
1641 em28xx_devused&=~(1<<dev->devno);
1642 kfree(dev);
1643 return -ENOMEM;
1644 }
1645
1646 /* Fills VBI device info */
1647 dev->vbi_dev->type = VFL_TYPE_VBI;
1648 dev->vbi_dev->fops = &em28xx_v4l_fops;
1649 dev->vbi_dev->minor = -1;
1650 dev->vbi_dev->dev = &dev->udev->dev;
1651 dev->vbi_dev->release = video_device_release;
1652 snprintf(dev->vbi_dev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
1653 "em28xx",dev->devno,"vbi");
1654
1655 /* Fills CAPTURE device info */
1656 dev->vdev->type = VID_TYPE_CAPTURE;
1657 if (dev->has_tuner)
1658 dev->vdev->type |= VID_TYPE_TUNER;
1659 dev->vdev->fops = &em28xx_v4l_fops;
1660 dev->vdev->minor = -1;
1661 dev->vdev->dev = &dev->udev->dev;
1662 dev->vdev->release = video_device_release;
1663 snprintf(dev->vdev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
1664 "em28xx",dev->devno,"video");
1665
1666 list_add_tail(&dev->devlist,&em28xx_devlist);
1667
1668
1669 if (dev->has_msp34xx) {
1670 /* Send a reset to other chips via gpio */
1671 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1672 msleep(3);
1673 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1674 msleep(3);
1675
1676 }
1677 video_mux(dev, 0);
1678
1679 /* register v4l2 device */
1680 if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
1681 video_nr[dev->devno]))) {
1682 em28xx_errdev("unable to register video device (error=%i).\n",
1683 retval);
1684 mutex_unlock(&dev->lock);
1685 list_del(&dev->devlist);
1686 video_device_release(dev->vdev);
1687 em28xx_devused&=~(1<<dev->devno);
1688 kfree(dev);
1689 return -ENODEV;
1690 }
1691
1692 if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
1693 vbi_nr[dev->devno]) < 0) {
1694 printk("unable to register vbi device\n");
1695 mutex_unlock(&dev->lock);
1696 list_del(&dev->devlist);
1697 video_device_release(dev->vbi_dev);
1698 video_device_release(dev->vdev);
1699 em28xx_devused&=~(1<<dev->devno);
1700 kfree(dev);
1701 return -ENODEV;
1702 } else {
1703 printk("registered VBI\n");
1704 }
1705
1706 em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
1707 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1708 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1709
1710 return 0;
1711 }
1712
1713 /*
1714 * em28xx_usb_probe()
1715 * checks for supported devices
1716 */
1717 static int em28xx_usb_probe(struct usb_interface *interface,
1718 const struct usb_device_id *id)
1719 {
1720 const struct usb_endpoint_descriptor *endpoint;
1721 struct usb_device *udev;
1722 struct usb_interface *uif;
1723 struct em28xx *dev = NULL;
1724 int retval = -ENODEV;
1725 int i, nr, ifnum;
1726
1727 udev = usb_get_dev(interface_to_usbdev(interface));
1728 ifnum = interface->altsetting[0].desc.bInterfaceNumber;
1729
1730 /* Check to see next free device and mark as used */
1731 nr=find_first_zero_bit(&em28xx_devused,EM28XX_MAXBOARDS);
1732 em28xx_devused|=1<<nr;
1733
1734 /* Don't register audio interfaces */
1735 if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
1736 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
1737 udev->descriptor.idVendor,udev->descriptor.idProduct,
1738 ifnum,
1739 interface->altsetting[0].desc.bInterfaceClass);
1740
1741 em28xx_devused&=~(1<<nr);
1742 return -ENODEV;
1743 }
1744
1745 em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
1746 udev->descriptor.idVendor,udev->descriptor.idProduct,
1747 ifnum,
1748 interface->altsetting[0].desc.bInterfaceClass);
1749
1750 endpoint = &interface->cur_altsetting->endpoint[1].desc;
1751
1752 /* check if the device has the iso in endpoint at the correct place */
1753 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1754 USB_ENDPOINT_XFER_ISOC) {
1755 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
1756 em28xx_devused&=~(1<<nr);
1757 return -ENODEV;
1758 }
1759 if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
1760 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
1761 em28xx_devused&=~(1<<nr);
1762 return -ENODEV;
1763 }
1764
1765 if (nr >= EM28XX_MAXBOARDS) {
1766 printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
1767 em28xx_devused&=~(1<<nr);
1768 return -ENOMEM;
1769 }
1770
1771 /* allocate memory for our device state and initialize it */
1772 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1773 if (dev == NULL) {
1774 em28xx_err(DRIVER_NAME ": out of memory!\n");
1775 em28xx_devused&=~(1<<nr);
1776 return -ENOMEM;
1777 }
1778
1779 snprintf(dev->name, 29, "em28xx #%d", nr);
1780 dev->devno = nr;
1781 dev->model = id->driver_info;
1782
1783 /* compute alternate max packet sizes */
1784 uif = udev->actconfig->interface[0];
1785
1786 dev->num_alt=uif->num_altsetting;
1787 em28xx_info("Alternate settings: %i\n",dev->num_alt);
1788 // dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
1789 dev->alt_max_pkt_size = kmalloc(32*
1790 dev->num_alt,GFP_KERNEL);
1791 if (dev->alt_max_pkt_size == NULL) {
1792 em28xx_errdev("out of memory!\n");
1793 em28xx_devused&=~(1<<nr);
1794 kfree(dev);
1795 return -ENOMEM;
1796 }
1797
1798 for (i = 0; i < dev->num_alt ; i++) {
1799 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
1800 wMaxPacketSize);
1801 dev->alt_max_pkt_size[i] =
1802 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
1803 em28xx_info("Alternate setting %i, max size= %i\n",i,
1804 dev->alt_max_pkt_size[i]);
1805 }
1806
1807 if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
1808 dev->model = card[nr];
1809
1810 /* allocate device struct */
1811 retval = em28xx_init_dev(&dev, udev, nr);
1812 if (retval)
1813 return retval;
1814
1815 em28xx_info("Found %s\n", em28xx_boards[dev->model].name);
1816
1817 /* save our data pointer in this interface device */
1818 usb_set_intfdata(interface, dev);
1819 return 0;
1820 }
1821
1822 /*
1823 * em28xx_usb_disconnect()
1824 * called when the device gets diconencted
1825 * video device will be unregistered on v4l2_close in case it is still open
1826 */
1827 static void em28xx_usb_disconnect(struct usb_interface *interface)
1828 {
1829 struct em28xx *dev;
1830
1831 dev = usb_get_intfdata(interface);
1832 usb_set_intfdata(interface, NULL);
1833
1834 if (!dev)
1835 return;
1836
1837 em28xx_info("disconnecting %s\n", dev->vdev->name);
1838
1839 /* wait until all current v4l2 io is finished then deallocate resources */
1840 mutex_lock(&dev->lock);
1841
1842 wake_up_interruptible_all(&dev->open);
1843
1844 if (dev->users) {
1845 em28xx_warn
1846 ("device /dev/video%d is open! Deregistration and memory "
1847 "deallocation are deferred on close.\n",
1848 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
1849
1850 dev->state |= DEV_MISCONFIGURED;
1851 em28xx_uninit_isoc(dev);
1852 dev->state |= DEV_DISCONNECTED;
1853 wake_up_interruptible(&dev->wait_frame);
1854 wake_up_interruptible(&dev->wait_stream);
1855 } else {
1856 dev->state |= DEV_DISCONNECTED;
1857 em28xx_release_resources(dev);
1858 }
1859
1860
1861 mutex_unlock(&dev->lock);
1862
1863 if (!dev->users) {
1864 kfree(dev->alt_max_pkt_size);
1865 kfree(dev);
1866 }
1867
1868 }
1869
1870 static struct usb_driver em28xx_usb_driver = {
1871 .name = "em28xx",
1872 .probe = em28xx_usb_probe,
1873 .disconnect = em28xx_usb_disconnect,
1874 .id_table = em28xx_id_table,
1875 };
1876
1877 static int __init em28xx_module_init(void)
1878 {
1879 int result;
1880
1881 printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
1882 (EM28XX_VERSION_CODE >> 16) & 0xff,
1883 (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
1884 #ifdef SNAPSHOT
1885 printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
1886 SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
1887 #endif
1888
1889 /* register this driver with the USB subsystem */
1890 result = usb_register(&em28xx_usb_driver);
1891 if (result)
1892 em28xx_err(DRIVER_NAME
1893 " usb_register failed. Error number %d.\n", result);
1894
1895 return result;
1896 }
1897
1898 static void __exit em28xx_module_exit(void)
1899 {
1900 /* deregister this driver with the USB subsystem */
1901 usb_deregister(&em28xx_usb_driver);
1902 }
1903
1904 module_init(em28xx_module_init);
1905 module_exit(em28xx_module_exit);
Linux kernel - Deliverables
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