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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[linux-2.6-block.git] / drivers / media / usb / stk1160 / stk1160-v4l.c
CommitLineData
c942fddf 1// SPDX-License-Identifier: GPL-2.0-or-later
9cb2173e
EG		 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>
9cb2173e
EG		 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>
9cb2173e
EG		 24#include <media/videobuf2-vmalloc.h>
25
b5dcee22 26#include <media/i2c/saa7115.h>
9cb2173e
EG		 27
28#include "stk1160.h"
29#include "stk1160-reg.h"
30
9cb2173e
EG		 31static bool keep_buffers;
32module_param(keep_buffers, bool, 0644);
33MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
34
d3194520
EG		 35enum stk1160_decimate_mode {
36 STK1160_DECIMATE_MORE_THAN_HALF,
37 STK1160_DECIMATE_LESS_THAN_HALF,
38};
39
40struct 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
9cb2173e
EG		 46/* supported video standards */
47static struct stk1160_fmt format[] = {
48 {
49 .name = "16 bpp YUY2, 4:2:2, packed",
50 .fourcc = V4L2_PIX_FMT_UYVY,
51 .depth = 16,
52 }
53};
54
d3194520
EG		 55/*
56 * Helper to find the next divisor that results in modulo being zero.
57 * This is required to guarantee valid decimation unit counts.
58 */
59static unsigned int
60div_round_integer(unsigned int x, unsigned int y)
61{
62 for (;; y++) {
63 if (x % y == 0)
64 return x / y;
65 }
66}
67
9cb2173e
EG		 68static void stk1160_set_std(struct stk1160 *dev)
69{
70 int i;
71
72 static struct regval std525[] = {
73
74 /* 720x480 */
75
76 /* Frame start */
77 {STK116_CFSPO_STX_L, 0x0000},
78 {STK116_CFSPO_STX_H, 0x0000},
79 {STK116_CFSPO_STY_L, 0x0003},
80 {STK116_CFSPO_STY_H, 0x0000},
81
82 /* Frame end */
83 {STK116_CFEPO_ENX_L, 0x05a0},
84 {STK116_CFEPO_ENX_H, 0x0005},
85 {STK116_CFEPO_ENY_L, 0x00f3},
86 {STK116_CFEPO_ENY_H, 0x0000},
87
88 {0xffff, 0xffff}
89 };
90
91 static struct regval std625[] = {
92
93 /* 720x576 */
94
95 /* TODO: Each line of frame has some junk at the end */
96 /* Frame start */
97 {STK116_CFSPO, 0x0000},
98 {STK116_CFSPO+1, 0x0000},
99 {STK116_CFSPO+2, 0x0001},
100 {STK116_CFSPO+3, 0x0000},
101
102 /* Frame end */
103 {STK116_CFEPO, 0x05a0},
104 {STK116_CFEPO+1, 0x0005},
105 {STK116_CFEPO+2, 0x0121},
106 {STK116_CFEPO+3, 0x0001},
107
108 {0xffff, 0xffff}
109 };
110
111 if (dev->norm & V4L2_STD_525_60) {
112 stk1160_dbg("registers to NTSC like standard\n");
113 for (i = 0; std525[i].reg != 0xffff; i++)
114 stk1160_write_reg(dev, std525[i].reg, std525[i].val);
115 } else {
116 stk1160_dbg("registers to PAL like standard\n");
117 for (i = 0; std625[i].reg != 0xffff; i++)
118 stk1160_write_reg(dev, std625[i].reg, std625[i].val);
119 }
120
121}
122
d3194520
EG		 123static void stk1160_set_fmt(struct stk1160 *dev,
124 struct stk1160_decimate_ctrl *ctrl)
125{
126 u32 val = 0;
127
128 if (ctrl) {
129 /*
130 * Since the format is UYVY, the device must skip or send
131 * a number of rows/columns multiple of four. This way, the
132 * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit
133 * does exactly this.
134 */
135 val |= STK1160_DEC_UNIT_SIZE;
136 val |= ctrl->col_en ? STK1160_H_DEC_EN : 0;
137 val |= ctrl->row_en ? STK1160_V_DEC_EN : 0;
138 val |= ctrl->col_mode ==
139 STK1160_DECIMATE_MORE_THAN_HALF ?
140 STK1160_H_DEC_MODE : 0;
141 val |= ctrl->row_mode ==
142 STK1160_DECIMATE_MORE_THAN_HALF ?
143 STK1160_V_DEC_MODE : 0;
144
145 /* Horizontal count units */
146 stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n);
147 /* Vertical count units */
148 stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n);
149
150 stk1160_dbg("decimate 0x%x, column units %d, row units %d\n",
151 val, ctrl->col_n, ctrl->row_n);
152 }
153
154 /* Decimation control */
155 stk1160_write_reg(dev, STK1160_DMCTRL, val);
156}
157
9cb2173e
EG		 158/*
159 * Set a new alternate setting.
160 * Returns true is dev->max_pkt_size has changed, false otherwise.
161 */
162static bool stk1160_set_alternate(struct stk1160 *dev)
163{
164 int i, prev_alt = dev->alt;
165 unsigned int min_pkt_size;
166 bool new_pkt_size;
167
168 /*
169 * If we don't set right alternate,
170 * then we will get a green screen with junk.
171 */
172 min_pkt_size = STK1160_MIN_PKT_SIZE;
173
174 for (i = 0; i < dev->num_alt; i++) {
175 /* stop when the selected alt setting offers enough bandwidth */
176 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
177 dev->alt = i;
178 break;
179 /*
180 * otherwise make sure that we end up with the maximum bandwidth
181 * because the min_pkt_size equation might be wrong...
182 */
183 } else if (dev->alt_max_pkt_size[i] >
184 dev->alt_max_pkt_size[dev->alt])
185 dev->alt = i;
186 }
187
890024ad 188 stk1160_dbg("setting alternate %d\n", dev->alt);
9cb2173e
EG		 189
190 if (dev->alt != prev_alt) {
191 stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
192 min_pkt_size, dev->alt);
193 stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
194 dev->alt, dev->alt_max_pkt_size[dev->alt]);
195 usb_set_interface(dev->udev, 0, dev->alt);
196 }
197
198 new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
199 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
200
201 return new_pkt_size;
202}
203
204static int stk1160_start_streaming(struct stk1160 *dev)
205{
9cb2173e 206 bool new_pkt_size;
f367cc1e
DC		 207 int rc = 0;
208 int i;
9cb2173e
EG		 209
210 /* Check device presence */
211 if (!dev->udev)
212 return -ENODEV;
213
214 if (mutex_lock_interruptible(&dev->v4l_lock))
215 return -ERESTARTSYS;
216 /*
217 * For some reason it is mandatory to set alternate *first*
218 * and only *then* initialize isoc urbs.
219 * Someone please explain me why ;)
220 */
221 new_pkt_size = stk1160_set_alternate(dev);
222
223 /*
224 * We (re)allocate isoc urbs if:
225 * there is no allocated isoc urbs, OR
226 * a new dev->max_pkt_size is detected
227 */
228 if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
229 rc = stk1160_alloc_isoc(dev);
230 if (rc < 0)
8ac45649 231 goto out_stop_hw;
9cb2173e
EG		 232 }
233
234 /* submit urbs and enables IRQ */
235 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
236 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
237 if (rc) {
238 stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
8ac45649 239 goto out_uninit;
9cb2173e
EG		 240 }
241 }
242
243 /* Start saa711x */
244 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
245
e3e30f63
HV		 246 dev->sequence = 0;
247
9cb2173e
EG		 248 /* Start stk1160 */
249 stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
250 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
251
252 stk1160_dbg("streaming started\n");
253
8ac45649
EG		 254 mutex_unlock(&dev->v4l_lock);
255
256 return 0;
257
258out_uninit:
259 stk1160_uninit_isoc(dev);
260out_stop_hw:
261 usb_set_interface(dev->udev, 0, 0);
262 stk1160_clear_queue(dev);
263
9cb2173e
EG		 264 mutex_unlock(&dev->v4l_lock);
265
f367cc1e 266 return rc;
9cb2173e
EG		 267}
268
269/* Must be called with v4l_lock hold */
270static void stk1160_stop_hw(struct stk1160 *dev)
271{
272 /* If the device is not physically present, there is nothing to do */
273 if (!dev->udev)
274 return;
275
276 /* set alternate 0 */
277 dev->alt = 0;
890024ad 278 stk1160_dbg("setting alternate %d\n", dev->alt);
9cb2173e
EG		 279 usb_set_interface(dev->udev, 0, 0);
280
281 /* Stop stk1160 */
282 stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
283 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
284
285 /* Stop saa711x */
286 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
287}
288
289static int stk1160_stop_streaming(struct stk1160 *dev)
290{
291 if (mutex_lock_interruptible(&dev->v4l_lock))
292 return -ERESTARTSYS;
293
aeff0927
EG		 294 /*
295 * Once URBs are cancelled, the URB complete handler
296 * won't be running. This is required to safely release the
297 * current buffer (dev->isoc_ctl.buf).
298 */
9cb2173e
EG		 299 stk1160_cancel_isoc(dev);
300
301 /*
302 * It is possible to keep buffers around using a module parameter.
303 * This is intended to avoid memory fragmentation.
304 */
305 if (!keep_buffers)
306 stk1160_free_isoc(dev);
307
308 stk1160_stop_hw(dev);
309
310 stk1160_clear_queue(dev);
311
312 stk1160_dbg("streaming stopped\n");
313
314 mutex_unlock(&dev->v4l_lock);
315
316 return 0;
317}
318
ff05c984 319static const struct v4l2_file_operations stk1160_fops = {
9cb2173e
EG		 320 .owner = THIS_MODULE,
321 .open = v4l2_fh_open,
322 .release = vb2_fop_release,
323 .read = vb2_fop_read,
324 .poll = vb2_fop_poll,
325 .mmap = vb2_fop_mmap,
326 .unlocked_ioctl = video_ioctl2,
327};
328
329/*
330 * vidioc ioctls
331 */
332static int vidioc_querycap(struct file *file,
333 void *priv, struct v4l2_capability *cap)
334{
335 struct stk1160 *dev = video_drvdata(file);
336
cc1e6315
MCC		 337 strscpy(cap->driver, "stk1160", sizeof(cap->driver));
338 strscpy(cap->card, "stk1160", sizeof(cap->card));
9cb2173e
EG		 339 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
340 cap->device_caps =
341 V4L2_CAP_VIDEO_CAPTURE |
342 V4L2_CAP_STREAMING |
343 V4L2_CAP_READWRITE;
344 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
345 return 0;
346}
347
348static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
349 struct v4l2_fmtdesc *f)
350{
351 if (f->index != 0)
352 return -EINVAL;
353
c0decac1 354 strscpy(f->description, format[f->index].name, sizeof(f->description));
9cb2173e
EG		 355 f->pixelformat = format[f->index].fourcc;
356 return 0;
357}
358
359static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
360 struct v4l2_format *f)
361{
362 struct stk1160 *dev = video_drvdata(file);
363
364 f->fmt.pix.width = dev->width;
365 f->fmt.pix.height = dev->height;
366 f->fmt.pix.field = V4L2_FIELD_INTERLACED;
367 f->fmt.pix.pixelformat = dev->fmt->fourcc;
368 f->fmt.pix.bytesperline = dev->width * 2;
369 f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
370 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
371
372 return 0;
373}
374
d3194520
EG		 375static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f,
376 struct stk1160_decimate_ctrl *ctrl)
9cb2173e 377{
d3194520
EG		 378 unsigned int width, height;
379 unsigned int base_width, base_height;
380 unsigned int col_n, row_n;
381 enum stk1160_decimate_mode col_mode, row_mode;
382 bool col_en, row_en;
383
384 base_width = 720;
385 base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576;
386
387 /* Minimum width and height is 5% the frame size */
388 width = clamp_t(unsigned int, f->fmt.pix.width,
389 base_width / 20, base_width);
390 height = clamp_t(unsigned int, f->fmt.pix.height,
391 base_height / 20, base_height);
392
393 /* Let's set default no decimation values */
394 col_n = 0;
395 row_n = 0;
396 col_en = false;
397 row_en = false;
398 f->fmt.pix.width = base_width;
399 f->fmt.pix.height = base_height;
400 row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
401 col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
402
403 if (width < base_width && width > base_width / 2) {
404 /*
405 * The device will send count units for each
406 * unit skipped. This means count unit is:
407 *
408 * n = width / (frame width - width)
409 *
410 * And the width is:
411 *
412 * width = (n / n + 1) * frame width
413 */
414 col_n = div_round_integer(width, base_width - width);
415 if (col_n > 0 && col_n <= 255) {
416 col_en = true;
417 col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
418 f->fmt.pix.width = (base_width * col_n) / (col_n + 1);
419 }
9cb2173e 420
d3194520
EG		 421 } else if (width <= base_width / 2) {
422
423 /*
424 * The device will skip count units for each
425 * unit sent. This means count is:
426 *
427 * n = (frame width / width) - 1
428 *
429 * And the width is:
430 *
431 * width = frame width / (n + 1)
432 */
433 col_n = div_round_integer(base_width, width) - 1;
434 if (col_n > 0 && col_n <= 255) {
435 col_en = true;
436 col_mode = STK1160_DECIMATE_MORE_THAN_HALF;
437 f->fmt.pix.width = base_width / (col_n + 1);
438 }
439 }
440
441 if (height < base_height && height > base_height / 2) {
442 row_n = div_round_integer(height, base_height - height);
443 if (row_n > 0 && row_n <= 255) {
444 row_en = true;
445 row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
446 f->fmt.pix.height = (base_height * row_n) / (row_n + 1);
447 }
448
449 } else if (height <= base_height / 2) {
450 row_n = div_round_integer(base_height, height) - 1;
451 if (row_n > 0 && row_n <= 255) {
452 row_en = true;
453 row_mode = STK1160_DECIMATE_MORE_THAN_HALF;
454 f->fmt.pix.height = base_height / (row_n + 1);
455 }
456 }
9cb2173e 457
c6b69c6c 458 f->fmt.pix.pixelformat = dev->fmt->fourcc;
9cb2173e 459 f->fmt.pix.field = V4L2_FIELD_INTERLACED;
d3194520
EG		 460 f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
461 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
9cb2173e
EG		 462 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
463
d3194520
EG		 464 if (ctrl) {
465 ctrl->col_en = col_en;
466 ctrl->col_n = col_n;
467 ctrl->col_mode = col_mode;
468 ctrl->row_en = row_en;
469 ctrl->row_n = row_n;
470 ctrl->row_mode = row_mode;
471 }
472
473 stk1160_dbg("width %d, height %d\n",
474 f->fmt.pix.width, f->fmt.pix.height);
9cb2173e
EG		 475 return 0;
476}
477
d3194520
EG		 478static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
479 struct v4l2_format *f)
480{
481 struct stk1160 *dev = video_drvdata(file);
482
483 return stk1160_try_fmt(dev, f, NULL);
484}
485
9cb2173e
EG		 486static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
487 struct v4l2_format *f)
488{
489 struct stk1160 *dev = video_drvdata(file);
490 struct vb2_queue *q = &dev->vb_vidq;
d3194520
EG		 491 struct stk1160_decimate_ctrl ctrl;
492 int rc;
9cb2173e
EG		 493
494 if (vb2_is_busy(q))
495 return -EBUSY;
496
d3194520
EG		 497 rc = stk1160_try_fmt(dev, f, &ctrl);
498 if (rc < 0)
499 return rc;
500 dev->width = f->fmt.pix.width;
501 dev->height = f->fmt.pix.height;
502 stk1160_set_fmt(dev, &ctrl);
9cb2173e
EG		 503
504 return 0;
505}
506
507static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
508{
509 struct stk1160 *dev = video_drvdata(file);
510 v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
511 return 0;
512}
513
514static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
515{
516 struct stk1160 *dev = video_drvdata(file);
517
518 *norm = dev->norm;
519 return 0;
520}
521
314527ac 522static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
9cb2173e
EG		 523{
524 struct stk1160 *dev = video_drvdata(file);
525 struct vb2_queue *q = &dev->vb_vidq;
526
b3ba8fa6
EG		 527 if (dev->norm == norm)
528 return 0;
529
9cb2173e
EG		 530 if (vb2_is_busy(q))
531 return -EBUSY;
532
533 /* Check device presence */
534 if (!dev->udev)
535 return -ENODEV;
536
537 /* We need to set this now, before we call stk1160_set_std */
d3194520
EG		 538 dev->width = 720;
539 dev->height = (norm & V4L2_STD_525_60) ? 480 : 576;
314527ac 540 dev->norm = norm;
9cb2173e 541
9cb2173e
EG		 542 stk1160_set_std(dev);
543
d3194520
EG		 544 /* Calling with NULL disables frame decimation */
545 stk1160_set_fmt(dev, NULL);
546
8774bed9 547 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
9cb2173e
EG		 548 dev->norm);
549
550 return 0;
551}
552
553
554static int vidioc_enum_input(struct file *file, void *priv,
555 struct v4l2_input *i)
556{
557 struct stk1160 *dev = video_drvdata(file);
558
559 if (i->index > STK1160_MAX_INPUT)
560 return -EINVAL;
561
56a960bf
EG		 562 /* S-Video special handling */
563 if (i->index == STK1160_SVIDEO_INPUT)
564 sprintf(i->name, "S-Video");
565 else
566 sprintf(i->name, "Composite%d", i->index);
567
9cb2173e
EG		 568 i->type = V4L2_INPUT_TYPE_CAMERA;
569 i->std = dev->vdev.tvnorms;
570 return 0;
571}
572
573static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
574{
575 struct stk1160 *dev = video_drvdata(file);
576 *i = dev->ctl_input;
577 return 0;
578}
579
580static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
581{
582 struct stk1160 *dev = video_drvdata(file);
583
9cb2173e
EG		 584 if (i > STK1160_MAX_INPUT)
585 return -EINVAL;
586
587 dev->ctl_input = i;
588
589 stk1160_select_input(dev);
590
591 return 0;
592}
593
9cb2173e
EG		 594#ifdef CONFIG_VIDEO_ADV_DEBUG
595static int vidioc_g_register(struct file *file, void *priv,
596 struct v4l2_dbg_register *reg)
597{
598 struct stk1160 *dev = video_drvdata(file);
599 int rc;
600 u8 val;
601
9cb2173e
EG		 602 /* Match host */
603 rc = stk1160_read_reg(dev, reg->reg, &val);
604 reg->val = val;
605 reg->size = 1;
606
607 return rc;
608}
609
610static int vidioc_s_register(struct file *file, void *priv,
977ba3b1 611 const struct v4l2_dbg_register *reg)
9cb2173e
EG		 612{
613 struct stk1160 *dev = video_drvdata(file);
614
9cb2173e 615 /* Match host */
4580278f 616 return stk1160_write_reg(dev, reg->reg, reg->val);
9cb2173e
EG		 617}
618#endif
619
620static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
621 .vidioc_querycap = vidioc_querycap,
622 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
623 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
624 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
625 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
626 .vidioc_querystd = vidioc_querystd,
627 .vidioc_g_std = vidioc_g_std,
628 .vidioc_s_std = vidioc_s_std,
629 .vidioc_enum_input = vidioc_enum_input,
630 .vidioc_g_input = vidioc_g_input,
631 .vidioc_s_input = vidioc_s_input,
632
633 /* vb2 takes care of these */
634 .vidioc_reqbufs = vb2_ioctl_reqbufs,
635 .vidioc_querybuf = vb2_ioctl_querybuf,
636 .vidioc_qbuf = vb2_ioctl_qbuf,
637 .vidioc_dqbuf = vb2_ioctl_dqbuf,
638 .vidioc_streamon = vb2_ioctl_streamon,
639 .vidioc_streamoff = vb2_ioctl_streamoff,
ebbb5637 640 .vidioc_expbuf = vb2_ioctl_expbuf,
9cb2173e
EG		 641
642 .vidioc_log_status = v4l2_ctrl_log_status,
643 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
644 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
9cb2173e
EG		 645
646#ifdef CONFIG_VIDEO_ADV_DEBUG
647 .vidioc_g_register = vidioc_g_register,
648 .vidioc_s_register = vidioc_s_register,
649#endif
650};
651
652/********************************************************************/
653
654/*
655 * Videobuf2 operations
656 */
df9ecb0c 657static int queue_setup(struct vb2_queue *vq,
9cb2173e 658 unsigned int *nbuffers, unsigned int *nplanes,
36c0f8b3 659 unsigned int sizes[], struct device *alloc_devs[])
9cb2173e
EG		 660{
661 struct stk1160 *dev = vb2_get_drv_priv(vq);
662 unsigned long size;
663
664 size = dev->width * dev->height * 2;
665
666 /*
667 * Here we can change the number of buffers being requested.
668 * So, we set a minimum and a maximum like this:
669 */
670 *nbuffers = clamp_t(unsigned int, *nbuffers,
671 STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
672
d27d5f1a
HF		 673 if (*nplanes)
674 return sizes[0] < size ? -EINVAL : 0;
675
9cb2173e
EG		 676 /* This means a packed colorformat */
677 *nplanes = 1;
678
679 sizes[0] = size;
680
890024ad
EG		 681 stk1160_dbg("%s: buffer count %d, each %ld bytes\n",
682 __func__, *nbuffers, size);
9cb2173e
EG		 683
684 return 0;
685}
686
687static void buffer_queue(struct vb2_buffer *vb)
688{
689 unsigned long flags;
690 struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
2d700715 691 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
9cb2173e 692 struct stk1160_buffer *buf =
2d700715 693 container_of(vbuf, struct stk1160_buffer, vb);
9cb2173e
EG		 694
695 spin_lock_irqsave(&dev->buf_lock, flags);
696 if (!dev->udev) {
697 /*
698 * If the device is disconnected return the buffer to userspace
699 * directly. The next QBUF call will fail with -ENODEV.
700 */
2d700715 701 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
9cb2173e
EG		 702 } else {
703
704 buf->mem = vb2_plane_vaddr(vb, 0);
705 buf->length = vb2_plane_size(vb, 0);
706 buf->bytesused = 0;
707 buf->pos = 0;
708
709 /*
710 * If buffer length is less from expected then we return
711 * the buffer to userspace directly.
712 */
713 if (buf->length < dev->width * dev->height * 2)
2d700715 714 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
9cb2173e
EG		 715 else
716 list_add_tail(&buf->list, &dev->avail_bufs);
717
718 }
719 spin_unlock_irqrestore(&dev->buf_lock, flags);
720}
721
722static int start_streaming(struct vb2_queue *vq, unsigned int count)
723{
724 struct stk1160 *dev = vb2_get_drv_priv(vq);
725 return stk1160_start_streaming(dev);
726}
727
728/* abort streaming and wait for last buffer */
e37559b2 729static void stop_streaming(struct vb2_queue *vq)
9cb2173e
EG		 730{
731 struct stk1160 *dev = vb2_get_drv_priv(vq);
e37559b2 732 stk1160_stop_streaming(dev);
9cb2173e
EG		 733}
734
1bc17717 735static const struct vb2_ops stk1160_video_qops = {
9cb2173e
EG		 736 .queue_setup = queue_setup,
737 .buf_queue = buffer_queue,
738 .start_streaming = start_streaming,
739 .stop_streaming = stop_streaming,
740 .wait_prepare = vb2_ops_wait_prepare,
741 .wait_finish = vb2_ops_wait_finish,
742};
743
86844942 744static const struct video_device v4l_template = {
9cb2173e
EG		 745 .name = "stk1160",
746 .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
747 .fops = &stk1160_fops,
748 .ioctl_ops = &stk1160_ioctl_ops,
749 .release = video_device_release_empty,
750};
751
752/********************************************************************/
753
754/* Must be called with both v4l_lock and vb_queue_lock hold */
755void stk1160_clear_queue(struct stk1160 *dev)
756{
757 struct stk1160_buffer *buf;
758 unsigned long flags;
759
760 /* Release all active buffers */
761 spin_lock_irqsave(&dev->buf_lock, flags);
762 while (!list_empty(&dev->avail_bufs)) {
763 buf = list_first_entry(&dev->avail_bufs,
764 struct stk1160_buffer, list);
765 list_del(&buf->list);
2d700715 766 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
890024ad 767 stk1160_dbg("buffer [%p/%d] aborted\n",
2d700715 768 buf, buf->vb.vb2_buf.index);
9cb2173e 769 }
aeff0927
EG		 770
771 /* It's important to release the current buffer */
772 if (dev->isoc_ctl.buf) {
773 buf = dev->isoc_ctl.buf;
774 dev->isoc_ctl.buf = NULL;
775
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);
aeff0927 779 }
9cb2173e
EG		 780 spin_unlock_irqrestore(&dev->buf_lock, flags);
781}
782
783int stk1160_vb2_setup(struct stk1160 *dev)
784{
785 int rc;
786 struct vb2_queue *q;
787
788 q = &dev->vb_vidq;
9cb2173e 789 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ebbb5637 790 q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
9cb2173e
EG		 791 q->drv_priv = dev;
792 q->buf_struct_size = sizeof(struct stk1160_buffer);
793 q->ops = &stk1160_video_qops;
794 q->mem_ops = &vb2_vmalloc_memops;
de3e581f 795 q->lock = &dev->vb_queue_lock;
ade48681 796 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
9cb2173e
EG		 797
798 rc = vb2_queue_init(q);
799 if (rc < 0)
800 return rc;
801
802 /* initialize video dma queue */
803 INIT_LIST_HEAD(&dev->avail_bufs);
804
805 return 0;
806}
807
808int stk1160_video_register(struct stk1160 *dev)
809{
810 int rc;
811
812 /* Initialize video_device with a template structure */
813 dev->vdev = v4l_template;
9cb2173e
EG		 814 dev->vdev.queue = &dev->vb_vidq;
815
816 /*
817 * Provide mutexes for v4l2 core and for videobuf2 queue.
818 * It will be used to protect *only* v4l2 ioctls.
819 */
820 dev->vdev.lock = &dev->v4l_lock;
9cb2173e
EG		 821
822 /* This will be used to set video_device parent */
823 dev->vdev.v4l2_dev = &dev->v4l2_dev;
9cb2173e
EG		 824
825 /* NTSC is default */
826 dev->norm = V4L2_STD_NTSC_M;
827 dev->width = 720;
828 dev->height = 480;
829
830 /* set default format */
831 dev->fmt = &format[0];
832 stk1160_set_std(dev);
833
8774bed9 834 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
9cb2173e
EG		 835 dev->norm);
836
837 video_set_drvdata(&dev->vdev, dev);
838 rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
839 if (rc < 0) {
840 stk1160_err("video_register_device failed (%d)\n", rc);
841 return rc;
842 }
843
844 v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
845 video_device_node_name(&dev->vdev));
846
847 return 0;
848}
Linux 6.x block layer and io_uring tree(s)