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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / media / usb / stk1160 / stk1160-v4l.c
blobbcd14c66e8dfa5d51a2616127f5826dc8a543ee4
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * STK1160 driver
4 *
5 * Copyright (C) 2012 Ezequiel Garcia
6 * <elezegarcia--a.t--gmail.com>
7 *
8 * Based on Easycap driver by R.M. Thomas
9 * Copyright (C) 2010 R.M. Thomas
10 * <rmthomas--a.t--sciolus.org>
11 */
12
13 #include <linux/module.h>
14 #include <linux/usb.h>
15 #include <linux/mm.h>
16 #include <linux/slab.h>
17
18 #include <linux/videodev2.h>
19 #include <media/v4l2-device.h>
20 #include <media/v4l2-common.h>
21 #include <media/v4l2-ioctl.h>
22 #include <media/v4l2-fh.h>
23 #include <media/v4l2-event.h>
24 #include <media/videobuf2-vmalloc.h>
25
26 #include <media/i2c/saa7115.h>
27
28 #include "stk1160.h"
29 #include "stk1160-reg.h"
30
31 static bool keep_buffers;
32 module_param(keep_buffers, bool, 0644);
33 MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
34
35 enum stk1160_decimate_mode {
36 STK1160_DECIMATE_MORE_THAN_HALF,
37 STK1160_DECIMATE_LESS_THAN_HALF,
38 };
39
40 struct stk1160_decimate_ctrl {
41 bool col_en, row_en;
42 enum stk1160_decimate_mode col_mode, row_mode;
43 unsigned int col_n, row_n;
44 };
45
46 /* supported video standards */
47 static struct stk1160_fmt format[] = {
48 {
49 .fourcc = V4L2_PIX_FMT_UYVY,
50 .depth = 16,
51 }
52 };
53
54 /*
55 * Helper to find the next divisor that results in modulo being zero.
56 * This is required to guarantee valid decimation unit counts.
57 */
58 static unsigned int
59 div_round_integer(unsigned int x, unsigned int y)
60 {
61 for (;; y++) {
62 if (x % y == 0)
63 return x / y;
64 }
65 }
66
67 static void stk1160_set_std(struct stk1160 *dev)
68 {
69 int i;
70
71 static struct regval std525[] = {
72
73 /* 720x480 */
74
75 /* Frame start */
76 {STK116_CFSPO_STX_L, 0x0000},
77 {STK116_CFSPO_STX_H, 0x0000},
78 {STK116_CFSPO_STY_L, 0x0003},
79 {STK116_CFSPO_STY_H, 0x0000},
80
81 /* Frame end */
82 {STK116_CFEPO_ENX_L, 0x05a0},
83 {STK116_CFEPO_ENX_H, 0x0005},
84 {STK116_CFEPO_ENY_L, 0x00f3},
85 {STK116_CFEPO_ENY_H, 0x0000},
86
87 {0xffff, 0xffff}
88 };
89
90 static struct regval std625[] = {
91
92 /* 720x576 */
93
94 /* TODO: Each line of frame has some junk at the end */
95 /* Frame start */
96 {STK116_CFSPO, 0x0000},
97 {STK116_CFSPO+1, 0x0000},
98 {STK116_CFSPO+2, 0x0001},
99 {STK116_CFSPO+3, 0x0000},
100
101 /* Frame end */
102 {STK116_CFEPO, 0x05a0},
103 {STK116_CFEPO+1, 0x0005},
104 {STK116_CFEPO+2, 0x0121},
105 {STK116_CFEPO+3, 0x0001},
106
107 {0xffff, 0xffff}
108 };
109
110 if (dev->norm & V4L2_STD_525_60) {
111 stk1160_dbg("registers to NTSC like standard\n");
112 for (i = 0; std525[i].reg != 0xffff; i++)
113 stk1160_write_reg(dev, std525[i].reg, std525[i].val);
114 } else {
115 stk1160_dbg("registers to PAL like standard\n");
116 for (i = 0; std625[i].reg != 0xffff; i++)
117 stk1160_write_reg(dev, std625[i].reg, std625[i].val);
118 }
119
120 }
121
122 static void stk1160_set_fmt(struct stk1160 *dev,
123 struct stk1160_decimate_ctrl *ctrl)
124 {
125 u32 val = 0;
126
127 if (ctrl) {
128 /*
129 * Since the format is UYVY, the device must skip or send
130 * a number of rows/columns multiple of four. This way, the
131 * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit
132 * does exactly this.
133 */
134 val |= STK1160_DEC_UNIT_SIZE;
135 val |= ctrl->col_en ? STK1160_H_DEC_EN : 0;
136 val |= ctrl->row_en ? STK1160_V_DEC_EN : 0;
137 val |= ctrl->col_mode ==
138 STK1160_DECIMATE_MORE_THAN_HALF ?
139 STK1160_H_DEC_MODE : 0;
140 val |= ctrl->row_mode ==
141 STK1160_DECIMATE_MORE_THAN_HALF ?
142 STK1160_V_DEC_MODE : 0;
143
144 /* Horizontal count units */
145 stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n);
146 /* Vertical count units */
147 stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n);
148
149 stk1160_dbg("decimate 0x%x, column units %d, row units %d\n",
150 val, ctrl->col_n, ctrl->row_n);
151 }
152
153 /* Decimation control */
154 stk1160_write_reg(dev, STK1160_DMCTRL, val);
155 }
156
157 /*
158 * Set a new alternate setting.
159 * Returns true is dev->max_pkt_size has changed, false otherwise.
160 */
161 static bool stk1160_set_alternate(struct stk1160 *dev)
162 {
163 int i, prev_alt = dev->alt;
164 unsigned int min_pkt_size;
165 bool new_pkt_size;
166
167 /*
168 * If we don't set right alternate,
169 * then we will get a green screen with junk.
170 */
171 min_pkt_size = STK1160_MIN_PKT_SIZE;
172
173 for (i = 0; i < dev->num_alt; i++) {
174 /* stop when the selected alt setting offers enough bandwidth */
175 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
176 dev->alt = i;
177 break;
178 /*
179 * otherwise make sure that we end up with the maximum bandwidth
180 * because the min_pkt_size equation might be wrong...
181 */
182 } else if (dev->alt_max_pkt_size[i] >
183 dev->alt_max_pkt_size[dev->alt])
184 dev->alt = i;
185 }
186
187 stk1160_dbg("setting alternate %d\n", dev->alt);
188
189 if (dev->alt != prev_alt) {
190 stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
191 min_pkt_size, dev->alt);
192 stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
193 dev->alt, dev->alt_max_pkt_size[dev->alt]);
194 usb_set_interface(dev->udev, 0, dev->alt);
195 }
196
197 new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
198 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
199
200 return new_pkt_size;
201 }
202
203 static int stk1160_start_streaming(struct stk1160 *dev)
204 {
205 bool new_pkt_size;
206 int rc = 0;
207 int i;
208
209 /* Check device presence */
210 if (!dev->udev)
211 return -ENODEV;
212
213 if (mutex_lock_interruptible(&dev->v4l_lock))
214 return -ERESTARTSYS;
215 /*
216 * For some reason it is mandatory to set alternate *first*
217 * and only *then* initialize isoc urbs.
218 * Someone please explain me why ;)
219 */
220 new_pkt_size = stk1160_set_alternate(dev);
221
222 /*
223 * We (re)allocate isoc urbs if:
224 * there is no allocated isoc urbs, OR
225 * a new dev->max_pkt_size is detected
226 */
227 if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
228 rc = stk1160_alloc_isoc(dev);
229 if (rc < 0)
230 goto out_stop_hw;
231 }
232
233 /* submit urbs and enables IRQ */
234 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
235 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
236 if (rc) {
237 stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
238 goto out_uninit;
239 }
240 }
241
242 /* Start saa711x */
243 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
244
245 dev->sequence = 0;
246
247 /* Start stk1160 */
248 stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
249 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
250
251 stk1160_dbg("streaming started\n");
252
253 mutex_unlock(&dev->v4l_lock);
254
255 return 0;
256
257 out_uninit:
258 stk1160_uninit_isoc(dev);
259 out_stop_hw:
260 usb_set_interface(dev->udev, 0, 0);
261 stk1160_clear_queue(dev);
262
263 mutex_unlock(&dev->v4l_lock);
264
265 return rc;
266 }
267
268 /* Must be called with v4l_lock hold */
269 static void stk1160_stop_hw(struct stk1160 *dev)
270 {
271 /* If the device is not physically present, there is nothing to do */
272 if (!dev->udev)
273 return;
274
275 /* set alternate 0 */
276 dev->alt = 0;
277 stk1160_dbg("setting alternate %d\n", dev->alt);
278 usb_set_interface(dev->udev, 0, 0);
279
280 /* Stop stk1160 */
281 stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
282 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
283
284 /* Stop saa711x */
285 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
286 }
287
288 static int stk1160_stop_streaming(struct stk1160 *dev)
289 {
290 if (mutex_lock_interruptible(&dev->v4l_lock))
291 return -ERESTARTSYS;
292
293 /*
294 * Once URBs are cancelled, the URB complete handler
295 * won't be running. This is required to safely release the
296 * current buffer (dev->isoc_ctl.buf).
297 */
298 stk1160_cancel_isoc(dev);
299
300 /*
301 * It is possible to keep buffers around using a module parameter.
302 * This is intended to avoid memory fragmentation.
303 */
304 if (!keep_buffers)
305 stk1160_free_isoc(dev);
306
307 stk1160_stop_hw(dev);
308
309 stk1160_clear_queue(dev);
310
311 stk1160_dbg("streaming stopped\n");
312
313 mutex_unlock(&dev->v4l_lock);
314
315 return 0;
316 }
317
318 static const struct v4l2_file_operations stk1160_fops = {
319 .owner = THIS_MODULE,
320 .open = v4l2_fh_open,
321 .release = vb2_fop_release,
322 .read = vb2_fop_read,
323 .poll = vb2_fop_poll,
324 .mmap = vb2_fop_mmap,
325 .unlocked_ioctl = video_ioctl2,
326 };
327
328 /*
329 * vidioc ioctls
330 */
331 static int vidioc_querycap(struct file *file,
332 void *priv, struct v4l2_capability *cap)
333 {
334 struct stk1160 *dev = video_drvdata(file);
335
336 strscpy(cap->driver, "stk1160", sizeof(cap->driver));
337 strscpy(cap->card, "stk1160", sizeof(cap->card));
338 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
339 return 0;
340 }
341
342 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
343 struct v4l2_fmtdesc *f)
344 {
345 if (f->index != 0)
346 return -EINVAL;
347
348 f->pixelformat = format[f->index].fourcc;
349 return 0;
350 }
351
352 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
353 struct v4l2_format *f)
354 {
355 struct stk1160 *dev = video_drvdata(file);
356
357 f->fmt.pix.width = dev->width;
358 f->fmt.pix.height = dev->height;
359 f->fmt.pix.field = V4L2_FIELD_INTERLACED;
360 f->fmt.pix.pixelformat = dev->fmt->fourcc;
361 f->fmt.pix.bytesperline = dev->width * 2;
362 f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
363 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
364
365 return 0;
366 }
367
368 static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f,
369 struct stk1160_decimate_ctrl *ctrl)
370 {
371 unsigned int width, height;
372 unsigned int base_width, base_height;
373 unsigned int col_n, row_n;
374 enum stk1160_decimate_mode col_mode, row_mode;
375 bool col_en, row_en;
376
377 base_width = 720;
378 base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576;
379
380 /* Minimum width and height is 5% the frame size */
381 width = clamp_t(unsigned int, f->fmt.pix.width,
382 base_width / 20, base_width);
383 height = clamp_t(unsigned int, f->fmt.pix.height,
384 base_height / 20, base_height);
385
386 /* Let's set default no decimation values */
387 col_n = 0;
388 row_n = 0;
389 col_en = false;
390 row_en = false;
391 f->fmt.pix.width = base_width;
392 f->fmt.pix.height = base_height;
393 row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
394 col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
395
396 if (width < base_width && width > base_width / 2) {
397 /*
398 * The device will send count units for each
399 * unit skipped. This means count unit is:
400 *
401 * n = width / (frame width - width)
402 *
403 * And the width is:
404 *
405 * width = (n / n + 1) * frame width
406 */
407 col_n = div_round_integer(width, base_width - width);
408 if (col_n > 0 && col_n <= 255) {
409 col_en = true;
410 col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
411 f->fmt.pix.width = (base_width * col_n) / (col_n + 1);
412 }
413
414 } else if (width <= base_width / 2) {
415
416 /*
417 * The device will skip count units for each
418 * unit sent. This means count is:
419 *
420 * n = (frame width / width) - 1
421 *
422 * And the width is:
423 *
424 * width = frame width / (n + 1)
425 */
426 col_n = div_round_integer(base_width, width) - 1;
427 if (col_n > 0 && col_n <= 255) {
428 col_en = true;
429 col_mode = STK1160_DECIMATE_MORE_THAN_HALF;
430 f->fmt.pix.width = base_width / (col_n + 1);
431 }
432 }
433
434 if (height < base_height && height > base_height / 2) {
435 row_n = div_round_integer(height, base_height - height);
436 if (row_n > 0 && row_n <= 255) {
437 row_en = true;
438 row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
439 f->fmt.pix.height = (base_height * row_n) / (row_n + 1);
440 }
441
442 } else if (height <= base_height / 2) {
443 row_n = div_round_integer(base_height, height) - 1;
444 if (row_n > 0 && row_n <= 255) {
445 row_en = true;
446 row_mode = STK1160_DECIMATE_MORE_THAN_HALF;
447 f->fmt.pix.height = base_height / (row_n + 1);
448 }
449 }
450
451 f->fmt.pix.pixelformat = dev->fmt->fourcc;
452 f->fmt.pix.field = V4L2_FIELD_INTERLACED;
453 f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
454 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
455 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
456
457 if (ctrl) {
458 ctrl->col_en = col_en;
459 ctrl->col_n = col_n;
460 ctrl->col_mode = col_mode;
461 ctrl->row_en = row_en;
462 ctrl->row_n = row_n;
463 ctrl->row_mode = row_mode;
464 }
465
466 stk1160_dbg("width %d, height %d\n",
467 f->fmt.pix.width, f->fmt.pix.height);
468 return 0;
469 }
470
471 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
472 struct v4l2_format *f)
473 {
474 struct stk1160 *dev = video_drvdata(file);
475
476 return stk1160_try_fmt(dev, f, NULL);
477 }
478
479 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
480 struct v4l2_format *f)
481 {
482 struct stk1160 *dev = video_drvdata(file);
483 struct vb2_queue *q = &dev->vb_vidq;
484 struct stk1160_decimate_ctrl ctrl;
485 int rc;
486
487 if (vb2_is_busy(q))
488 return -EBUSY;
489
490 rc = stk1160_try_fmt(dev, f, &ctrl);
491 if (rc < 0)
492 return rc;
493 dev->width = f->fmt.pix.width;
494 dev->height = f->fmt.pix.height;
495 stk1160_set_fmt(dev, &ctrl);
496
497 return 0;
498 }
499
500 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
501 {
502 struct stk1160 *dev = video_drvdata(file);
503 v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
504 return 0;
505 }
506
507 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
508 {
509 struct stk1160 *dev = video_drvdata(file);
510
511 *norm = dev->norm;
512 return 0;
513 }
514
515 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
516 {
517 struct stk1160 *dev = video_drvdata(file);
518 struct vb2_queue *q = &dev->vb_vidq;
519
520 if (dev->norm == norm)
521 return 0;
522
523 if (vb2_is_busy(q))
524 return -EBUSY;
525
526 /* Check device presence */
527 if (!dev->udev)
528 return -ENODEV;
529
530 /* We need to set this now, before we call stk1160_set_std */
531 dev->width = 720;
532 dev->height = (norm & V4L2_STD_525_60) ? 480 : 576;
533 dev->norm = norm;
534
535 stk1160_set_std(dev);
536
537 /* Calling with NULL disables frame decimation */
538 stk1160_set_fmt(dev, NULL);
539
540 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
541 dev->norm);
542
543 return 0;
544 }
545
546
547 static int vidioc_enum_input(struct file *file, void *priv,
548 struct v4l2_input *i)
549 {
550 struct stk1160 *dev = video_drvdata(file);
551
552 if (i->index > STK1160_MAX_INPUT)
553 return -EINVAL;
554
555 /* S-Video special handling */
556 if (i->index == STK1160_SVIDEO_INPUT)
557 sprintf(i->name, "S-Video");
558 else
559 sprintf(i->name, "Composite%d", i->index);
560
561 i->type = V4L2_INPUT_TYPE_CAMERA;
562 i->std = dev->vdev.tvnorms;
563 return 0;
564 }
565
566 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
567 {
568 struct stk1160 *dev = video_drvdata(file);
569 *i = dev->ctl_input;
570 return 0;
571 }
572
573 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
574 {
575 struct stk1160 *dev = video_drvdata(file);
576
577 if (i > STK1160_MAX_INPUT)
578 return -EINVAL;
579
580 dev->ctl_input = i;
581
582 stk1160_select_input(dev);
583
584 return 0;
585 }
586
587 #ifdef CONFIG_VIDEO_ADV_DEBUG
588 static int vidioc_g_register(struct file *file, void *priv,
589 struct v4l2_dbg_register *reg)
590 {
591 struct stk1160 *dev = video_drvdata(file);
592 int rc;
593 u8 val;
594
595 /* Match host */
596 rc = stk1160_read_reg(dev, reg->reg, &val);
597 reg->val = val;
598 reg->size = 1;
599
600 return rc;
601 }
602
603 static int vidioc_s_register(struct file *file, void *priv,
604 const struct v4l2_dbg_register *reg)
605 {
606 struct stk1160 *dev = video_drvdata(file);
607
608 /* Match host */
609 return stk1160_write_reg(dev, reg->reg, reg->val);
610 }
611 #endif
612
613 static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
614 .vidioc_querycap = vidioc_querycap,
615 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
616 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
617 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
618 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
619 .vidioc_querystd = vidioc_querystd,
620 .vidioc_g_std = vidioc_g_std,
621 .vidioc_s_std = vidioc_s_std,
622 .vidioc_enum_input = vidioc_enum_input,
623 .vidioc_g_input = vidioc_g_input,
624 .vidioc_s_input = vidioc_s_input,
625
626 /* vb2 takes care of these */
627 .vidioc_reqbufs = vb2_ioctl_reqbufs,
628 .vidioc_querybuf = vb2_ioctl_querybuf,
629 .vidioc_qbuf = vb2_ioctl_qbuf,
630 .vidioc_dqbuf = vb2_ioctl_dqbuf,
631 .vidioc_streamon = vb2_ioctl_streamon,
632 .vidioc_streamoff = vb2_ioctl_streamoff,
633 .vidioc_expbuf = vb2_ioctl_expbuf,
634
635 .vidioc_log_status = v4l2_ctrl_log_status,
636 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
637 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
638
639 #ifdef CONFIG_VIDEO_ADV_DEBUG
640 .vidioc_g_register = vidioc_g_register,
641 .vidioc_s_register = vidioc_s_register,
642 #endif
643 };
644
645 /********************************************************************/
646
647 /*
648 * Videobuf2 operations
649 */
650 static int queue_setup(struct vb2_queue *vq,
651 unsigned int *nbuffers, unsigned int *nplanes,
652 unsigned int sizes[], struct device *alloc_devs[])
653 {
654 struct stk1160 *dev = vb2_get_drv_priv(vq);
655 unsigned long size;
656
657 size = dev->width * dev->height * 2;
658
659 /*
660 * Here we can change the number of buffers being requested.
661 * So, we set a minimum and a maximum like this:
662 */
663 *nbuffers = clamp_t(unsigned int, *nbuffers,
664 STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
665
666 if (*nplanes)
667 return sizes[0] < size ? -EINVAL : 0;
668
669 /* This means a packed colorformat */
670 *nplanes = 1;
671
672 sizes[0] = size;
673
674 stk1160_dbg("%s: buffer count %d, each %ld bytes\n",
675 __func__, *nbuffers, size);
676
677 return 0;
678 }
679
680 static void buffer_queue(struct vb2_buffer *vb)
681 {
682 unsigned long flags;
683 struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
684 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
685 struct stk1160_buffer *buf =
686 container_of(vbuf, struct stk1160_buffer, vb);
687
688 spin_lock_irqsave(&dev->buf_lock, flags);
689 if (!dev->udev) {
690 /*
691 * If the device is disconnected return the buffer to userspace
692 * directly. The next QBUF call will fail with -ENODEV.
693 */
694 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
695 } else {
696
697 buf->mem = vb2_plane_vaddr(vb, 0);
698 buf->length = vb2_plane_size(vb, 0);
699 buf->bytesused = 0;
700 buf->pos = 0;
701
702 /*
703 * If buffer length is less from expected then we return
704 * the buffer to userspace directly.
705 */
706 if (buf->length < dev->width * dev->height * 2)
707 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
708 else
709 list_add_tail(&buf->list, &dev->avail_bufs);
710
711 }
712 spin_unlock_irqrestore(&dev->buf_lock, flags);
713 }
714
715 static int start_streaming(struct vb2_queue *vq, unsigned int count)
716 {
717 struct stk1160 *dev = vb2_get_drv_priv(vq);
718 return stk1160_start_streaming(dev);
719 }
720
721 /* abort streaming and wait for last buffer */
722 static void stop_streaming(struct vb2_queue *vq)
723 {
724 struct stk1160 *dev = vb2_get_drv_priv(vq);
725 stk1160_stop_streaming(dev);
726 }
727
728 static const struct vb2_ops stk1160_video_qops = {
729 .queue_setup = queue_setup,
730 .buf_queue = buffer_queue,
731 .start_streaming = start_streaming,
732 .stop_streaming = stop_streaming,
733 .wait_prepare = vb2_ops_wait_prepare,
734 .wait_finish = vb2_ops_wait_finish,
735 };
736
737 static const struct video_device v4l_template = {
738 .name = "stk1160",
739 .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
740 .fops = &stk1160_fops,
741 .ioctl_ops = &stk1160_ioctl_ops,
742 .release = video_device_release_empty,
743 };
744
745 /********************************************************************/
746
747 /* Must be called with both v4l_lock and vb_queue_lock hold */
748 void stk1160_clear_queue(struct stk1160 *dev)
749 {
750 struct stk1160_buffer *buf;
751 unsigned long flags;
752
753 /* Release all active buffers */
754 spin_lock_irqsave(&dev->buf_lock, flags);
755 while (!list_empty(&dev->avail_bufs)) {
756 buf = list_first_entry(&dev->avail_bufs,
757 struct stk1160_buffer, list);
758 list_del(&buf->list);
759 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
760 stk1160_dbg("buffer [%p/%d] aborted\n",
761 buf, buf->vb.vb2_buf.index);
762 }
763
764 /* It's important to release the current buffer */
765 if (dev->isoc_ctl.buf) {
766 buf = dev->isoc_ctl.buf;
767 dev->isoc_ctl.buf = NULL;
768
769 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
770 stk1160_dbg("buffer [%p/%d] aborted\n",
771 buf, buf->vb.vb2_buf.index);
772 }
773 spin_unlock_irqrestore(&dev->buf_lock, flags);
774 }
775
776 int stk1160_vb2_setup(struct stk1160 *dev)
777 {
778 int rc;
779 struct vb2_queue *q;
780
781 q = &dev->vb_vidq;
782 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
783 q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
784 q->drv_priv = dev;
785 q->buf_struct_size = sizeof(struct stk1160_buffer);
786 q->ops = &stk1160_video_qops;
787 q->mem_ops = &vb2_vmalloc_memops;
788 q->lock = &dev->vb_queue_lock;
789 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
790
791 rc = vb2_queue_init(q);
792 if (rc < 0)
793 return rc;
794
795 /* initialize video dma queue */
796 INIT_LIST_HEAD(&dev->avail_bufs);
797
798 return 0;
799 }
800
801 int stk1160_video_register(struct stk1160 *dev)
802 {
803 int rc;
804
805 /* Initialize video_device with a template structure */
806 dev->vdev = v4l_template;
807 dev->vdev.queue = &dev->vb_vidq;
808
809 /*
810 * Provide mutexes for v4l2 core and for videobuf2 queue.
811 * It will be used to protect *only* v4l2 ioctls.
812 */
813 dev->vdev.lock = &dev->v4l_lock;
814
815 /* This will be used to set video_device parent */
816 dev->vdev.v4l2_dev = &dev->v4l2_dev;
817 dev->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
818 V4L2_CAP_READWRITE;
819
820 /* NTSC is default */
821 dev->norm = V4L2_STD_NTSC_M;
822 dev->width = 720;
823 dev->height = 480;
824
825 /* set default format */
826 dev->fmt = &format[0];
827 stk1160_set_std(dev);
828
829 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
830 dev->norm);
831
832 video_set_drvdata(&dev->vdev, dev);
833 rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
834 if (rc < 0) {
835 stk1160_err("video_register_device failed (%d)\n", rc);
836 return rc;
837 }
838
839 v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
840 video_device_node_name(&dev->vdev));
841
842 return 0;
843 }
Linux with added FPC-III support