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Linux 4.14-rc6
[linux-2.6-block.git] / drivers / media / usb / stk1160 / stk1160-v4l.c
CommitLineData
9cb2173e
EG		 1/*
2 * STK1160 driver
3 *
4 * Copyright (C) 2012 Ezequiel Garcia
5 * <elezegarcia--a.t--gmail.com>
6 *
7 * Based on Easycap driver by R.M. Thomas
8 * Copyright (C) 2010 R.M. Thomas
9 * <rmthomas--a.t--sciolus.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 */
22
23#include <linux/module.h>
24#include <linux/usb.h>
25#include <linux/mm.h>
26#include <linux/slab.h>
27
28#include <linux/videodev2.h>
29#include <media/v4l2-device.h>
30#include <media/v4l2-common.h>
31#include <media/v4l2-ioctl.h>
32#include <media/v4l2-fh.h>
33#include <media/v4l2-event.h>
9cb2173e
EG		 34#include <media/videobuf2-vmalloc.h>
35
b5dcee22 36#include <media/i2c/saa7115.h>
9cb2173e
EG		 37
38#include "stk1160.h"
39#include "stk1160-reg.h"
40
9cb2173e
EG		 41static bool keep_buffers;
42module_param(keep_buffers, bool, 0644);
43MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
44
d3194520
EG		 45enum stk1160_decimate_mode {
46 STK1160_DECIMATE_MORE_THAN_HALF,
47 STK1160_DECIMATE_LESS_THAN_HALF,
48};
49
50struct stk1160_decimate_ctrl {
51 bool col_en, row_en;
52 enum stk1160_decimate_mode col_mode, row_mode;
53 unsigned int col_n, row_n;
54};
55
9cb2173e
EG		 56/* supported video standards */
57static struct stk1160_fmt format[] = {
58 {
59 .name = "16 bpp YUY2, 4:2:2, packed",
60 .fourcc = V4L2_PIX_FMT_UYVY,
61 .depth = 16,
62 }
63};
64
d3194520
EG		 65/*
66 * Helper to find the next divisor that results in modulo being zero.
67 * This is required to guarantee valid decimation unit counts.
68 */
69static unsigned int
70div_round_integer(unsigned int x, unsigned int y)
71{
72 for (;; y++) {
73 if (x % y == 0)
74 return x / y;
75 }
76}
77
9cb2173e
EG		 78static void stk1160_set_std(struct stk1160 *dev)
79{
80 int i;
81
82 static struct regval std525[] = {
83
84 /* 720x480 */
85
86 /* Frame start */
87 {STK116_CFSPO_STX_L, 0x0000},
88 {STK116_CFSPO_STX_H, 0x0000},
89 {STK116_CFSPO_STY_L, 0x0003},
90 {STK116_CFSPO_STY_H, 0x0000},
91
92 /* Frame end */
93 {STK116_CFEPO_ENX_L, 0x05a0},
94 {STK116_CFEPO_ENX_H, 0x0005},
95 {STK116_CFEPO_ENY_L, 0x00f3},
96 {STK116_CFEPO_ENY_H, 0x0000},
97
98 {0xffff, 0xffff}
99 };
100
101 static struct regval std625[] = {
102
103 /* 720x576 */
104
105 /* TODO: Each line of frame has some junk at the end */
106 /* Frame start */
107 {STK116_CFSPO, 0x0000},
108 {STK116_CFSPO+1, 0x0000},
109 {STK116_CFSPO+2, 0x0001},
110 {STK116_CFSPO+3, 0x0000},
111
112 /* Frame end */
113 {STK116_CFEPO, 0x05a0},
114 {STK116_CFEPO+1, 0x0005},
115 {STK116_CFEPO+2, 0x0121},
116 {STK116_CFEPO+3, 0x0001},
117
118 {0xffff, 0xffff}
119 };
120
121 if (dev->norm & V4L2_STD_525_60) {
122 stk1160_dbg("registers to NTSC like standard\n");
123 for (i = 0; std525[i].reg != 0xffff; i++)
124 stk1160_write_reg(dev, std525[i].reg, std525[i].val);
125 } else {
126 stk1160_dbg("registers to PAL like standard\n");
127 for (i = 0; std625[i].reg != 0xffff; i++)
128 stk1160_write_reg(dev, std625[i].reg, std625[i].val);
129 }
130
131}
132
d3194520
EG		 133static void stk1160_set_fmt(struct stk1160 *dev,
134 struct stk1160_decimate_ctrl *ctrl)
135{
136 u32 val = 0;
137
138 if (ctrl) {
139 /*
140 * Since the format is UYVY, the device must skip or send
141 * a number of rows/columns multiple of four. This way, the
142 * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit
143 * does exactly this.
144 */
145 val |= STK1160_DEC_UNIT_SIZE;
146 val |= ctrl->col_en ? STK1160_H_DEC_EN : 0;
147 val |= ctrl->row_en ? STK1160_V_DEC_EN : 0;
148 val |= ctrl->col_mode ==
149 STK1160_DECIMATE_MORE_THAN_HALF ?
150 STK1160_H_DEC_MODE : 0;
151 val |= ctrl->row_mode ==
152 STK1160_DECIMATE_MORE_THAN_HALF ?
153 STK1160_V_DEC_MODE : 0;
154
155 /* Horizontal count units */
156 stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n);
157 /* Vertical count units */
158 stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n);
159
160 stk1160_dbg("decimate 0x%x, column units %d, row units %d\n",
161 val, ctrl->col_n, ctrl->row_n);
162 }
163
164 /* Decimation control */
165 stk1160_write_reg(dev, STK1160_DMCTRL, val);
166}
167
9cb2173e
EG		 168/*
169 * Set a new alternate setting.
170 * Returns true is dev->max_pkt_size has changed, false otherwise.
171 */
172static bool stk1160_set_alternate(struct stk1160 *dev)
173{
174 int i, prev_alt = dev->alt;
175 unsigned int min_pkt_size;
176 bool new_pkt_size;
177
178 /*
179 * If we don't set right alternate,
180 * then we will get a green screen with junk.
181 */
182 min_pkt_size = STK1160_MIN_PKT_SIZE;
183
184 for (i = 0; i < dev->num_alt; i++) {
185 /* stop when the selected alt setting offers enough bandwidth */
186 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
187 dev->alt = i;
188 break;
189 /*
190 * otherwise make sure that we end up with the maximum bandwidth
191 * because the min_pkt_size equation might be wrong...
192 */
193 } else if (dev->alt_max_pkt_size[i] >
194 dev->alt_max_pkt_size[dev->alt])
195 dev->alt = i;
196 }
197
890024ad 198 stk1160_dbg("setting alternate %d\n", dev->alt);
9cb2173e
EG		 199
200 if (dev->alt != prev_alt) {
201 stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
202 min_pkt_size, dev->alt);
203 stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
204 dev->alt, dev->alt_max_pkt_size[dev->alt]);
205 usb_set_interface(dev->udev, 0, dev->alt);
206 }
207
208 new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
209 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
210
211 return new_pkt_size;
212}
213
214static int stk1160_start_streaming(struct stk1160 *dev)
215{
9cb2173e 216 bool new_pkt_size;
f367cc1e
DC		 217 int rc = 0;
218 int i;
9cb2173e
EG		 219
220 /* Check device presence */
221 if (!dev->udev)
222 return -ENODEV;
223
224 if (mutex_lock_interruptible(&dev->v4l_lock))
225 return -ERESTARTSYS;
226 /*
227 * For some reason it is mandatory to set alternate *first*
228 * and only *then* initialize isoc urbs.
229 * Someone please explain me why ;)
230 */
231 new_pkt_size = stk1160_set_alternate(dev);
232
233 /*
234 * We (re)allocate isoc urbs if:
235 * there is no allocated isoc urbs, OR
236 * a new dev->max_pkt_size is detected
237 */
238 if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
239 rc = stk1160_alloc_isoc(dev);
240 if (rc < 0)
8ac45649 241 goto out_stop_hw;
9cb2173e
EG		 242 }
243
244 /* submit urbs and enables IRQ */
245 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
246 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
247 if (rc) {
248 stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
8ac45649 249 goto out_uninit;
9cb2173e
EG		 250 }
251 }
252
253 /* Start saa711x */
254 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
255
e3e30f63
HV		 256 dev->sequence = 0;
257
9cb2173e
EG		 258 /* Start stk1160 */
259 stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
260 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
261
262 stk1160_dbg("streaming started\n");
263
8ac45649
EG		 264 mutex_unlock(&dev->v4l_lock);
265
266 return 0;
267
268out_uninit:
269 stk1160_uninit_isoc(dev);
270out_stop_hw:
271 usb_set_interface(dev->udev, 0, 0);
272 stk1160_clear_queue(dev);
273
9cb2173e
EG		 274 mutex_unlock(&dev->v4l_lock);
275
f367cc1e 276 return rc;
9cb2173e
EG		 277}
278
279/* Must be called with v4l_lock hold */
280static void stk1160_stop_hw(struct stk1160 *dev)
281{
282 /* If the device is not physically present, there is nothing to do */
283 if (!dev->udev)
284 return;
285
286 /* set alternate 0 */
287 dev->alt = 0;
890024ad 288 stk1160_dbg("setting alternate %d\n", dev->alt);
9cb2173e
EG		 289 usb_set_interface(dev->udev, 0, 0);
290
291 /* Stop stk1160 */
292 stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
293 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
294
295 /* Stop saa711x */
296 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
297}
298
299static int stk1160_stop_streaming(struct stk1160 *dev)
300{
301 if (mutex_lock_interruptible(&dev->v4l_lock))
302 return -ERESTARTSYS;
303
aeff0927
EG		 304 /*
305 * Once URBs are cancelled, the URB complete handler
306 * won't be running. This is required to safely release the
307 * current buffer (dev->isoc_ctl.buf).
308 */
9cb2173e
EG		 309 stk1160_cancel_isoc(dev);
310
311 /*
312 * It is possible to keep buffers around using a module parameter.
313 * This is intended to avoid memory fragmentation.
314 */
315 if (!keep_buffers)
316 stk1160_free_isoc(dev);
317
318 stk1160_stop_hw(dev);
319
320 stk1160_clear_queue(dev);
321
322 stk1160_dbg("streaming stopped\n");
323
324 mutex_unlock(&dev->v4l_lock);
325
326 return 0;
327}
328
ff05c984 329static const struct v4l2_file_operations stk1160_fops = {
9cb2173e
EG		 330 .owner = THIS_MODULE,
331 .open = v4l2_fh_open,
332 .release = vb2_fop_release,
333 .read = vb2_fop_read,
334 .poll = vb2_fop_poll,
335 .mmap = vb2_fop_mmap,
336 .unlocked_ioctl = video_ioctl2,
337};
338
339/*
340 * vidioc ioctls
341 */
342static int vidioc_querycap(struct file *file,
343 void *priv, struct v4l2_capability *cap)
344{
345 struct stk1160 *dev = video_drvdata(file);
346
347 strcpy(cap->driver, "stk1160");
348 strcpy(cap->card, "stk1160");
349 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
350 cap->device_caps =
351 V4L2_CAP_VIDEO_CAPTURE |
352 V4L2_CAP_STREAMING |
353 V4L2_CAP_READWRITE;
354 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
355 return 0;
356}
357
358static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
359 struct v4l2_fmtdesc *f)
360{
361 if (f->index != 0)
362 return -EINVAL;
363
364 strlcpy(f->description, format[f->index].name, sizeof(f->description));
365 f->pixelformat = format[f->index].fourcc;
366 return 0;
367}
368
369static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
370 struct v4l2_format *f)
371{
372 struct stk1160 *dev = video_drvdata(file);
373
374 f->fmt.pix.width = dev->width;
375 f->fmt.pix.height = dev->height;
376 f->fmt.pix.field = V4L2_FIELD_INTERLACED;
377 f->fmt.pix.pixelformat = dev->fmt->fourcc;
378 f->fmt.pix.bytesperline = dev->width * 2;
379 f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
380 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
381
382 return 0;
383}
384
d3194520
EG		 385static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f,
386 struct stk1160_decimate_ctrl *ctrl)
9cb2173e 387{
d3194520
EG		 388 unsigned int width, height;
389 unsigned int base_width, base_height;
390 unsigned int col_n, row_n;
391 enum stk1160_decimate_mode col_mode, row_mode;
392 bool col_en, row_en;
393
394 base_width = 720;
395 base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576;
396
397 /* Minimum width and height is 5% the frame size */
398 width = clamp_t(unsigned int, f->fmt.pix.width,
399 base_width / 20, base_width);
400 height = clamp_t(unsigned int, f->fmt.pix.height,
401 base_height / 20, base_height);
402
403 /* Let's set default no decimation values */
404 col_n = 0;
405 row_n = 0;
406 col_en = false;
407 row_en = false;
408 f->fmt.pix.width = base_width;
409 f->fmt.pix.height = base_height;
410 row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
411 col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
412
413 if (width < base_width && width > base_width / 2) {
414 /*
415 * The device will send count units for each
416 * unit skipped. This means count unit is:
417 *
418 * n = width / (frame width - width)
419 *
420 * And the width is:
421 *
422 * width = (n / n + 1) * frame width
423 */
424 col_n = div_round_integer(width, base_width - width);
425 if (col_n > 0 && col_n <= 255) {
426 col_en = true;
427 col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
428 f->fmt.pix.width = (base_width * col_n) / (col_n + 1);
429 }
9cb2173e 430
d3194520
EG		 431 } else if (width <= base_width / 2) {
432
433 /*
434 * The device will skip count units for each
435 * unit sent. This means count is:
436 *
437 * n = (frame width / width) - 1
438 *
439 * And the width is:
440 *
441 * width = frame width / (n + 1)
442 */
443 col_n = div_round_integer(base_width, width) - 1;
444 if (col_n > 0 && col_n <= 255) {
445 col_en = true;
446 col_mode = STK1160_DECIMATE_MORE_THAN_HALF;
447 f->fmt.pix.width = base_width / (col_n + 1);
448 }
449 }
450
451 if (height < base_height && height > base_height / 2) {
452 row_n = div_round_integer(height, base_height - height);
453 if (row_n > 0 && row_n <= 255) {
454 row_en = true;
455 row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
456 f->fmt.pix.height = (base_height * row_n) / (row_n + 1);
457 }
458
459 } else if (height <= base_height / 2) {
460 row_n = div_round_integer(base_height, height) - 1;
461 if (row_n > 0 && row_n <= 255) {
462 row_en = true;
463 row_mode = STK1160_DECIMATE_MORE_THAN_HALF;
464 f->fmt.pix.height = base_height / (row_n + 1);
465 }
466 }
9cb2173e 467
c6b69c6c 468 f->fmt.pix.pixelformat = dev->fmt->fourcc;
9cb2173e 469 f->fmt.pix.field = V4L2_FIELD_INTERLACED;
d3194520
EG		 470 f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
471 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
9cb2173e
EG		 472 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
473
d3194520
EG		 474 if (ctrl) {
475 ctrl->col_en = col_en;
476 ctrl->col_n = col_n;
477 ctrl->col_mode = col_mode;
478 ctrl->row_en = row_en;
479 ctrl->row_n = row_n;
480 ctrl->row_mode = row_mode;
481 }
482
483 stk1160_dbg("width %d, height %d\n",
484 f->fmt.pix.width, f->fmt.pix.height);
9cb2173e
EG		 485 return 0;
486}
487
d3194520
EG		 488static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
489 struct v4l2_format *f)
490{
491 struct stk1160 *dev = video_drvdata(file);
492
493 return stk1160_try_fmt(dev, f, NULL);
494}
495
9cb2173e
EG		 496static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
497 struct v4l2_format *f)
498{
499 struct stk1160 *dev = video_drvdata(file);
500 struct vb2_queue *q = &dev->vb_vidq;
d3194520
EG		 501 struct stk1160_decimate_ctrl ctrl;
502 int rc;
9cb2173e
EG		 503
504 if (vb2_is_busy(q))
505 return -EBUSY;
506
d3194520
EG		 507 rc = stk1160_try_fmt(dev, f, &ctrl);
508 if (rc < 0)
509 return rc;
510 dev->width = f->fmt.pix.width;
511 dev->height = f->fmt.pix.height;
512 stk1160_set_fmt(dev, &ctrl);
9cb2173e
EG		 513
514 return 0;
515}
516
517static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
518{
519 struct stk1160 *dev = video_drvdata(file);
520 v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
521 return 0;
522}
523
524static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
525{
526 struct stk1160 *dev = video_drvdata(file);
527
528 *norm = dev->norm;
529 return 0;
530}
531
314527ac 532static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
9cb2173e
EG		 533{
534 struct stk1160 *dev = video_drvdata(file);
535 struct vb2_queue *q = &dev->vb_vidq;
536
b3ba8fa6
EG		 537 if (dev->norm == norm)
538 return 0;
539
9cb2173e
EG		 540 if (vb2_is_busy(q))
541 return -EBUSY;
542
543 /* Check device presence */
544 if (!dev->udev)
545 return -ENODEV;
546
547 /* We need to set this now, before we call stk1160_set_std */
d3194520
EG		 548 dev->width = 720;
549 dev->height = (norm & V4L2_STD_525_60) ? 480 : 576;
314527ac 550 dev->norm = norm;
9cb2173e 551
9cb2173e
EG		 552 stk1160_set_std(dev);
553
d3194520
EG		 554 /* Calling with NULL disables frame decimation */
555 stk1160_set_fmt(dev, NULL);
556
8774bed9 557 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
9cb2173e
EG		 558 dev->norm);
559
560 return 0;
561}
562
563
564static int vidioc_enum_input(struct file *file, void *priv,
565 struct v4l2_input *i)
566{
567 struct stk1160 *dev = video_drvdata(file);
568
569 if (i->index > STK1160_MAX_INPUT)
570 return -EINVAL;
571
56a960bf
EG		 572 /* S-Video special handling */
573 if (i->index == STK1160_SVIDEO_INPUT)
574 sprintf(i->name, "S-Video");
575 else
576 sprintf(i->name, "Composite%d", i->index);
577
9cb2173e
EG		 578 i->type = V4L2_INPUT_TYPE_CAMERA;
579 i->std = dev->vdev.tvnorms;
580 return 0;
581}
582
583static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
584{
585 struct stk1160 *dev = video_drvdata(file);
586 *i = dev->ctl_input;
587 return 0;
588}
589
590static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
591{
592 struct stk1160 *dev = video_drvdata(file);
593
9cb2173e
EG		 594 if (i > STK1160_MAX_INPUT)
595 return -EINVAL;
596
597 dev->ctl_input = i;
598
599 stk1160_select_input(dev);
600
601 return 0;
602}
603
9cb2173e
EG		 604#ifdef CONFIG_VIDEO_ADV_DEBUG
605static int vidioc_g_register(struct file *file, void *priv,
606 struct v4l2_dbg_register *reg)
607{
608 struct stk1160 *dev = video_drvdata(file);
609 int rc;
610 u8 val;
611
9cb2173e
EG		 612 /* Match host */
613 rc = stk1160_read_reg(dev, reg->reg, &val);
614 reg->val = val;
615 reg->size = 1;
616
617 return rc;
618}
619
620static int vidioc_s_register(struct file *file, void *priv,
977ba3b1 621 const struct v4l2_dbg_register *reg)
9cb2173e
EG		 622{
623 struct stk1160 *dev = video_drvdata(file);
624
9cb2173e 625 /* Match host */
4580278f 626 return stk1160_write_reg(dev, reg->reg, reg->val);
9cb2173e
EG		 627}
628#endif
629
630static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
631 .vidioc_querycap = vidioc_querycap,
632 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
633 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
634 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
635 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
636 .vidioc_querystd = vidioc_querystd,
637 .vidioc_g_std = vidioc_g_std,
638 .vidioc_s_std = vidioc_s_std,
639 .vidioc_enum_input = vidioc_enum_input,
640 .vidioc_g_input = vidioc_g_input,
641 .vidioc_s_input = vidioc_s_input,
642
643 /* vb2 takes care of these */
644 .vidioc_reqbufs = vb2_ioctl_reqbufs,
645 .vidioc_querybuf = vb2_ioctl_querybuf,
646 .vidioc_qbuf = vb2_ioctl_qbuf,
647 .vidioc_dqbuf = vb2_ioctl_dqbuf,
648 .vidioc_streamon = vb2_ioctl_streamon,
649 .vidioc_streamoff = vb2_ioctl_streamoff,
ebbb5637 650 .vidioc_expbuf = vb2_ioctl_expbuf,
9cb2173e
EG		 651
652 .vidioc_log_status = v4l2_ctrl_log_status,
653 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
654 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
9cb2173e
EG		 655
656#ifdef CONFIG_VIDEO_ADV_DEBUG
657 .vidioc_g_register = vidioc_g_register,
658 .vidioc_s_register = vidioc_s_register,
659#endif
660};
661
662/********************************************************************/
663
664/*
665 * Videobuf2 operations
666 */
df9ecb0c 667static int queue_setup(struct vb2_queue *vq,
9cb2173e 668 unsigned int *nbuffers, unsigned int *nplanes,
36c0f8b3 669 unsigned int sizes[], struct device *alloc_devs[])
9cb2173e
EG		 670{
671 struct stk1160 *dev = vb2_get_drv_priv(vq);
672 unsigned long size;
673
674 size = dev->width * dev->height * 2;
675
676 /*
677 * Here we can change the number of buffers being requested.
678 * So, we set a minimum and a maximum like this:
679 */
680 *nbuffers = clamp_t(unsigned int, *nbuffers,
681 STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
682
d27d5f1a
HF		 683 if (*nplanes)
684 return sizes[0] < size ? -EINVAL : 0;
685
9cb2173e
EG		 686 /* This means a packed colorformat */
687 *nplanes = 1;
688
689 sizes[0] = size;
690
890024ad
EG		 691 stk1160_dbg("%s: buffer count %d, each %ld bytes\n",
692 __func__, *nbuffers, size);
9cb2173e
EG		 693
694 return 0;
695}
696
697static void buffer_queue(struct vb2_buffer *vb)
698{
699 unsigned long flags;
700 struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
2d700715 701 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
9cb2173e 702 struct stk1160_buffer *buf =
2d700715 703 container_of(vbuf, struct stk1160_buffer, vb);
9cb2173e
EG		 704
705 spin_lock_irqsave(&dev->buf_lock, flags);
706 if (!dev->udev) {
707 /*
708 * If the device is disconnected return the buffer to userspace
709 * directly. The next QBUF call will fail with -ENODEV.
710 */
2d700715 711 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
9cb2173e
EG		 712 } else {
713
714 buf->mem = vb2_plane_vaddr(vb, 0);
715 buf->length = vb2_plane_size(vb, 0);
716 buf->bytesused = 0;
717 buf->pos = 0;
718
719 /*
720 * If buffer length is less from expected then we return
721 * the buffer to userspace directly.
722 */
723 if (buf->length < dev->width * dev->height * 2)
2d700715 724 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
9cb2173e
EG		 725 else
726 list_add_tail(&buf->list, &dev->avail_bufs);
727
728 }
729 spin_unlock_irqrestore(&dev->buf_lock, flags);
730}
731
732static int start_streaming(struct vb2_queue *vq, unsigned int count)
733{
734 struct stk1160 *dev = vb2_get_drv_priv(vq);
735 return stk1160_start_streaming(dev);
736}
737
738/* abort streaming and wait for last buffer */
e37559b2 739static void stop_streaming(struct vb2_queue *vq)
9cb2173e
EG		 740{
741 struct stk1160 *dev = vb2_get_drv_priv(vq);
e37559b2 742 stk1160_stop_streaming(dev);
9cb2173e
EG		 743}
744
1bc17717 745static const struct vb2_ops stk1160_video_qops = {
9cb2173e
EG		 746 .queue_setup = queue_setup,
747 .buf_queue = buffer_queue,
748 .start_streaming = start_streaming,
749 .stop_streaming = stop_streaming,
750 .wait_prepare = vb2_ops_wait_prepare,
751 .wait_finish = vb2_ops_wait_finish,
752};
753
86844942 754static const struct video_device v4l_template = {
9cb2173e
EG		 755 .name = "stk1160",
756 .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
757 .fops = &stk1160_fops,
758 .ioctl_ops = &stk1160_ioctl_ops,
759 .release = video_device_release_empty,
760};
761
762/********************************************************************/
763
764/* Must be called with both v4l_lock and vb_queue_lock hold */
765void stk1160_clear_queue(struct stk1160 *dev)
766{
767 struct stk1160_buffer *buf;
768 unsigned long flags;
769
770 /* Release all active buffers */
771 spin_lock_irqsave(&dev->buf_lock, flags);
772 while (!list_empty(&dev->avail_bufs)) {
773 buf = list_first_entry(&dev->avail_bufs,
774 struct stk1160_buffer, list);
775 list_del(&buf->list);
2d700715 776 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
890024ad 777 stk1160_dbg("buffer [%p/%d] aborted\n",
2d700715 778 buf, buf->vb.vb2_buf.index);
9cb2173e 779 }
aeff0927
EG		 780
781 /* It's important to release the current buffer */
782 if (dev->isoc_ctl.buf) {
783 buf = dev->isoc_ctl.buf;
784 dev->isoc_ctl.buf = NULL;
785
2d700715 786 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
890024ad 787 stk1160_dbg("buffer [%p/%d] aborted\n",
2d700715 788 buf, buf->vb.vb2_buf.index);
aeff0927 789 }
9cb2173e
EG		 790 spin_unlock_irqrestore(&dev->buf_lock, flags);
791}
792
793int stk1160_vb2_setup(struct stk1160 *dev)
794{
795 int rc;
796 struct vb2_queue *q;
797
798 q = &dev->vb_vidq;
9cb2173e 799 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ebbb5637 800 q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
9cb2173e
EG		 801 q->drv_priv = dev;
802 q->buf_struct_size = sizeof(struct stk1160_buffer);
803 q->ops = &stk1160_video_qops;
804 q->mem_ops = &vb2_vmalloc_memops;
ade48681 805 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
9cb2173e
EG		 806
807 rc = vb2_queue_init(q);
808 if (rc < 0)
809 return rc;
810
811 /* initialize video dma queue */
812 INIT_LIST_HEAD(&dev->avail_bufs);
813
814 return 0;
815}
816
817int stk1160_video_register(struct stk1160 *dev)
818{
819 int rc;
820
821 /* Initialize video_device with a template structure */
822 dev->vdev = v4l_template;
9cb2173e
EG		 823 dev->vdev.queue = &dev->vb_vidq;
824
825 /*
826 * Provide mutexes for v4l2 core and for videobuf2 queue.
827 * It will be used to protect *only* v4l2 ioctls.
828 */
829 dev->vdev.lock = &dev->v4l_lock;
830 dev->vdev.queue->lock = &dev->vb_queue_lock;
831
832 /* This will be used to set video_device parent */
833 dev->vdev.v4l2_dev = &dev->v4l2_dev;
9cb2173e
EG		 834
835 /* NTSC is default */
836 dev->norm = V4L2_STD_NTSC_M;
837 dev->width = 720;
838 dev->height = 480;
839
840 /* set default format */
841 dev->fmt = &format[0];
842 stk1160_set_std(dev);
843
8774bed9 844 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
9cb2173e
EG		 845 dev->norm);
846
847 video_set_drvdata(&dev->vdev, dev);
848 rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
849 if (rc < 0) {
850 stk1160_err("video_register_device failed (%d)\n", rc);
851 return rc;
852 }
853
854 v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
855 video_device_node_name(&dev->vdev));
856
857 return 0;
858}
Linux 6.x block layer and io_uring tree(s)