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
div_round_integer(unsigned int x,unsigned int y)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
stk1160_set_std(struct stk1160 * dev)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
stk1160_set_fmt(struct stk1160 * dev,struct stk1160_decimate_ctrl * ctrl)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 */
stk1160_set_alternate(struct stk1160 * dev)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
stk1160_start_streaming(struct stk1160 * dev)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 struct stk1160_urb *stk_urb = &dev->isoc_ctl.urb_ctl[i];
236
237 dma_sync_sgtable_for_device(stk1160_get_dmadev(dev), stk_urb->sgt,
238 DMA_FROM_DEVICE);
239 rc = usb_submit_urb(dev->isoc_ctl.urb_ctl[i].urb, GFP_KERNEL);
240 if (rc) {
241 stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
242 goto out_uninit;
243 }
244 }
245
246 /* Start saa711x */
247 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
248
249 dev->sequence = 0;
250
251 /* Start stk1160 */
252 stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
253 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
254
255 stk1160_dbg("streaming started\n");
256
257 mutex_unlock(&dev->v4l_lock);
258
259 return 0;
260
261 out_uninit:
262 stk1160_uninit_isoc(dev);
263 out_stop_hw:
264 usb_set_interface(dev->udev, 0, 0);
265 stk1160_clear_queue(dev, VB2_BUF_STATE_QUEUED);
266
267 mutex_unlock(&dev->v4l_lock);
268
269 return rc;
270 }
271
272 /* Must be called with v4l_lock hold */
stk1160_stop_hw(struct stk1160 * dev)273 static void stk1160_stop_hw(struct stk1160 *dev)
274 {
275 /* If the device is not physically present, there is nothing to do */
276 if (!dev->udev)
277 return;
278
279 /* set alternate 0 */
280 dev->alt = 0;
281 stk1160_dbg("setting alternate %d\n", dev->alt);
282 usb_set_interface(dev->udev, 0, 0);
283
284 /* Stop stk1160 */
285 stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
286 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
287
288 /* Stop saa711x */
289 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
290 }
291
stk1160_stop_streaming(struct stk1160 * dev)292 static int stk1160_stop_streaming(struct stk1160 *dev)
293 {
294 if (mutex_lock_interruptible(&dev->v4l_lock))
295 return -ERESTARTSYS;
296
297 /*
298 * Once URBs are cancelled, the URB complete handler
299 * won't be running. This is required to safely release the
300 * current buffer (dev->isoc_ctl.buf).
301 */
302 stk1160_cancel_isoc(dev);
303
304 /*
305 * It is possible to keep buffers around using a module parameter.
306 * This is intended to avoid memory fragmentation.
307 */
308 if (!keep_buffers)
309 stk1160_free_isoc(dev);
310
311 stk1160_stop_hw(dev);
312
313 stk1160_clear_queue(dev, VB2_BUF_STATE_ERROR);
314
315 stk1160_dbg("streaming stopped\n");
316
317 mutex_unlock(&dev->v4l_lock);
318
319 return 0;
320 }
321
322 static const struct v4l2_file_operations stk1160_fops = {
323 .owner = THIS_MODULE,
324 .open = v4l2_fh_open,
325 .release = vb2_fop_release,
326 .read = vb2_fop_read,
327 .poll = vb2_fop_poll,
328 .mmap = vb2_fop_mmap,
329 .unlocked_ioctl = video_ioctl2,
330 };
331
332 /*
333 * vidioc ioctls
334 */
vidioc_querycap(struct file * file,void * priv,struct v4l2_capability * cap)335 static int vidioc_querycap(struct file *file,
336 void *priv, struct v4l2_capability *cap)
337 {
338 struct stk1160 *dev = video_drvdata(file);
339
340 strscpy(cap->driver, "stk1160", sizeof(cap->driver));
341 strscpy(cap->card, "stk1160", sizeof(cap->card));
342 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
343 return 0;
344 }
345
vidioc_enum_fmt_vid_cap(struct file * file,void * priv,struct v4l2_fmtdesc * f)346 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
347 struct v4l2_fmtdesc *f)
348 {
349 if (f->index != 0)
350 return -EINVAL;
351
352 f->pixelformat = format[f->index].fourcc;
353 return 0;
354 }
355
vidioc_g_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)356 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
357 struct v4l2_format *f)
358 {
359 struct stk1160 *dev = video_drvdata(file);
360
361 f->fmt.pix.width = dev->width;
362 f->fmt.pix.height = dev->height;
363 f->fmt.pix.field = V4L2_FIELD_INTERLACED;
364 f->fmt.pix.pixelformat = dev->fmt->fourcc;
365 f->fmt.pix.bytesperline = dev->width * 2;
366 f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
367 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
368
369 return 0;
370 }
371
stk1160_try_fmt(struct stk1160 * dev,struct v4l2_format * f,struct stk1160_decimate_ctrl * ctrl)372 static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f,
373 struct stk1160_decimate_ctrl *ctrl)
374 {
375 unsigned int width, height;
376 unsigned int base_width, base_height;
377 unsigned int col_n, row_n;
378 enum stk1160_decimate_mode col_mode, row_mode;
379 bool col_en, row_en;
380
381 base_width = 720;
382 base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576;
383
384 /* Minimum width and height is 5% the frame size */
385 width = clamp_t(unsigned int, f->fmt.pix.width,
386 base_width / 20, base_width);
387 height = clamp_t(unsigned int, f->fmt.pix.height,
388 base_height / 20, base_height);
389
390 /* Let's set default no decimation values */
391 col_n = 0;
392 row_n = 0;
393 col_en = false;
394 row_en = false;
395 f->fmt.pix.width = base_width;
396 f->fmt.pix.height = base_height;
397 row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
398 col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
399
400 if (width < base_width && width > base_width / 2) {
401 /*
402 * The device will send count units for each
403 * unit skipped. This means count unit is:
404 *
405 * n = width / (frame width - width)
406 *
407 * And the width is:
408 *
409 * width = (n / n + 1) * frame width
410 */
411 col_n = div_round_integer(width, base_width - width);
412 if (col_n > 0 && col_n <= 255) {
413 col_en = true;
414 col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
415 f->fmt.pix.width = (base_width * col_n) / (col_n + 1);
416 }
417
418 } else if (width <= base_width / 2) {
419
420 /*
421 * The device will skip count units for each
422 * unit sent. This means count is:
423 *
424 * n = (frame width / width) - 1
425 *
426 * And the width is:
427 *
428 * width = frame width / (n + 1)
429 */
430 col_n = div_round_integer(base_width, width) - 1;
431 if (col_n > 0 && col_n <= 255) {
432 col_en = true;
433 col_mode = STK1160_DECIMATE_MORE_THAN_HALF;
434 f->fmt.pix.width = base_width / (col_n + 1);
435 }
436 }
437
438 if (height < base_height && height > base_height / 2) {
439 row_n = div_round_integer(height, base_height - height);
440 if (row_n > 0 && row_n <= 255) {
441 row_en = true;
442 row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
443 f->fmt.pix.height = (base_height * row_n) / (row_n + 1);
444 }
445
446 } else if (height <= base_height / 2) {
447 row_n = div_round_integer(base_height, height) - 1;
448 if (row_n > 0 && row_n <= 255) {
449 row_en = true;
450 row_mode = STK1160_DECIMATE_MORE_THAN_HALF;
451 f->fmt.pix.height = base_height / (row_n + 1);
452 }
453 }
454
455 f->fmt.pix.pixelformat = dev->fmt->fourcc;
456 f->fmt.pix.field = V4L2_FIELD_INTERLACED;
457 f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
458 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
459 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
460
461 if (ctrl) {
462 ctrl->col_en = col_en;
463 ctrl->col_n = col_n;
464 ctrl->col_mode = col_mode;
465 ctrl->row_en = row_en;
466 ctrl->row_n = row_n;
467 ctrl->row_mode = row_mode;
468 }
469
470 stk1160_dbg("width %d, height %d\n",
471 f->fmt.pix.width, f->fmt.pix.height);
472 return 0;
473 }
474
vidioc_try_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)475 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
476 struct v4l2_format *f)
477 {
478 struct stk1160 *dev = video_drvdata(file);
479
480 return stk1160_try_fmt(dev, f, NULL);
481 }
482
vidioc_s_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)483 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
484 struct v4l2_format *f)
485 {
486 struct stk1160 *dev = video_drvdata(file);
487 struct vb2_queue *q = &dev->vb_vidq;
488 struct stk1160_decimate_ctrl ctrl;
489 int rc;
490
491 if (vb2_is_busy(q))
492 return -EBUSY;
493
494 rc = stk1160_try_fmt(dev, f, &ctrl);
495 if (rc < 0)
496 return rc;
497 dev->width = f->fmt.pix.width;
498 dev->height = f->fmt.pix.height;
499 stk1160_set_fmt(dev, &ctrl);
500
501 return 0;
502 }
503
vidioc_querystd(struct file * file,void * priv,v4l2_std_id * norm)504 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
505 {
506 struct stk1160 *dev = video_drvdata(file);
507 v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
508 return 0;
509 }
510
vidioc_g_std(struct file * file,void * priv,v4l2_std_id * norm)511 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
512 {
513 struct stk1160 *dev = video_drvdata(file);
514
515 *norm = dev->norm;
516 return 0;
517 }
518
vidioc_s_std(struct file * file,void * priv,v4l2_std_id norm)519 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
520 {
521 struct stk1160 *dev = video_drvdata(file);
522 struct vb2_queue *q = &dev->vb_vidq;
523
524 if (dev->norm == norm)
525 return 0;
526
527 if (vb2_is_busy(q))
528 return -EBUSY;
529
530 /* Check device presence */
531 if (!dev->udev)
532 return -ENODEV;
533
534 /* We need to set this now, before we call stk1160_set_std */
535 dev->width = 720;
536 dev->height = (norm & V4L2_STD_525_60) ? 480 : 576;
537 dev->norm = norm;
538
539 stk1160_set_std(dev);
540
541 /* Calling with NULL disables frame decimation */
542 stk1160_set_fmt(dev, NULL);
543
544 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
545 dev->norm);
546
547 return 0;
548 }
549
550
vidioc_enum_input(struct file * file,void * priv,struct v4l2_input * i)551 static int vidioc_enum_input(struct file *file, void *priv,
552 struct v4l2_input *i)
553 {
554 struct stk1160 *dev = video_drvdata(file);
555
556 if (i->index > STK1160_MAX_INPUT)
557 return -EINVAL;
558
559 /* S-Video special handling */
560 if (i->index == STK1160_SVIDEO_INPUT)
561 sprintf(i->name, "S-Video");
562 else
563 sprintf(i->name, "Composite%d", i->index);
564
565 i->type = V4L2_INPUT_TYPE_CAMERA;
566 i->std = dev->vdev.tvnorms;
567 return 0;
568 }
569
vidioc_g_input(struct file * file,void * priv,unsigned int * i)570 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
571 {
572 struct stk1160 *dev = video_drvdata(file);
573 *i = dev->ctl_input;
574 return 0;
575 }
576
vidioc_s_input(struct file * file,void * priv,unsigned int i)577 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
578 {
579 struct stk1160 *dev = video_drvdata(file);
580
581 if (i > STK1160_MAX_INPUT)
582 return -EINVAL;
583
584 dev->ctl_input = i;
585
586 stk1160_select_input(dev);
587
588 return 0;
589 }
590
591 #ifdef CONFIG_VIDEO_ADV_DEBUG
vidioc_g_register(struct file * file,void * priv,struct v4l2_dbg_register * reg)592 static int vidioc_g_register(struct file *file, void *priv,
593 struct v4l2_dbg_register *reg)
594 {
595 struct stk1160 *dev = video_drvdata(file);
596 int rc;
597 u8 val;
598
599 /* Match host */
600 rc = stk1160_read_reg(dev, reg->reg, &val);
601 reg->val = val;
602 reg->size = 1;
603
604 return rc;
605 }
606
vidioc_s_register(struct file * file,void * priv,const struct v4l2_dbg_register * reg)607 static int vidioc_s_register(struct file *file, void *priv,
608 const struct v4l2_dbg_register *reg)
609 {
610 struct stk1160 *dev = video_drvdata(file);
611
612 /* Match host */
613 return stk1160_write_reg(dev, reg->reg, reg->val);
614 }
615 #endif
616
617 static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
618 .vidioc_querycap = vidioc_querycap,
619 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
620 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
621 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
622 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
623 .vidioc_querystd = vidioc_querystd,
624 .vidioc_g_std = vidioc_g_std,
625 .vidioc_s_std = vidioc_s_std,
626 .vidioc_enum_input = vidioc_enum_input,
627 .vidioc_g_input = vidioc_g_input,
628 .vidioc_s_input = vidioc_s_input,
629
630 /* vb2 takes care of these */
631 .vidioc_reqbufs = vb2_ioctl_reqbufs,
632 .vidioc_querybuf = vb2_ioctl_querybuf,
633 .vidioc_qbuf = vb2_ioctl_qbuf,
634 .vidioc_dqbuf = vb2_ioctl_dqbuf,
635 .vidioc_streamon = vb2_ioctl_streamon,
636 .vidioc_streamoff = vb2_ioctl_streamoff,
637 .vidioc_expbuf = vb2_ioctl_expbuf,
638
639 .vidioc_log_status = v4l2_ctrl_log_status,
640 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
641 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
642
643 #ifdef CONFIG_VIDEO_ADV_DEBUG
644 .vidioc_g_register = vidioc_g_register,
645 .vidioc_s_register = vidioc_s_register,
646 #endif
647 };
648
649 /********************************************************************/
650
651 /*
652 * Videobuf2 operations
653 */
queue_setup(struct vb2_queue * vq,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])654 static int queue_setup(struct vb2_queue *vq,
655 unsigned int *nbuffers, unsigned int *nplanes,
656 unsigned int sizes[], struct device *alloc_devs[])
657 {
658 struct stk1160 *dev = vb2_get_drv_priv(vq);
659 unsigned long size;
660
661 size = dev->width * dev->height * 2;
662
663 /*
664 * Here we can change the number of buffers being requested.
665 * So, we set a minimum and a maximum like this:
666 */
667 *nbuffers = clamp_t(unsigned int, *nbuffers,
668 STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
669
670 if (*nplanes)
671 return sizes[0] < size ? -EINVAL : 0;
672
673 /* This means a packed colorformat */
674 *nplanes = 1;
675
676 sizes[0] = size;
677
678 stk1160_dbg("%s: buffer count %d, each %ld bytes\n",
679 __func__, *nbuffers, size);
680
681 return 0;
682 }
683
buffer_queue(struct vb2_buffer * vb)684 static void buffer_queue(struct vb2_buffer *vb)
685 {
686 unsigned long flags;
687 struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
688 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
689 struct stk1160_buffer *buf =
690 container_of(vbuf, struct stk1160_buffer, vb);
691
692 spin_lock_irqsave(&dev->buf_lock, flags);
693 if (!dev->udev) {
694 /*
695 * If the device is disconnected return the buffer to userspace
696 * directly. The next QBUF call will fail with -ENODEV.
697 */
698 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
699 } else {
700
701 buf->mem = vb2_plane_vaddr(vb, 0);
702 buf->length = vb2_plane_size(vb, 0);
703 buf->bytesused = 0;
704 buf->pos = 0;
705
706 /*
707 * If buffer length is less from expected then we return
708 * the buffer to userspace directly.
709 */
710 if (buf->length < dev->width * dev->height * 2)
711 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
712 else
713 list_add_tail(&buf->list, &dev->avail_bufs);
714
715 }
716 spin_unlock_irqrestore(&dev->buf_lock, flags);
717 }
718
start_streaming(struct vb2_queue * vq,unsigned int count)719 static int start_streaming(struct vb2_queue *vq, unsigned int count)
720 {
721 struct stk1160 *dev = vb2_get_drv_priv(vq);
722 return stk1160_start_streaming(dev);
723 }
724
725 /* abort streaming and wait for last buffer */
stop_streaming(struct vb2_queue * vq)726 static void stop_streaming(struct vb2_queue *vq)
727 {
728 struct stk1160 *dev = vb2_get_drv_priv(vq);
729 stk1160_stop_streaming(dev);
730 }
731
732 static const struct vb2_ops stk1160_video_qops = {
733 .queue_setup = queue_setup,
734 .buf_queue = buffer_queue,
735 .start_streaming = start_streaming,
736 .stop_streaming = stop_streaming,
737 .wait_prepare = vb2_ops_wait_prepare,
738 .wait_finish = vb2_ops_wait_finish,
739 };
740
741 static const struct video_device v4l_template = {
742 .name = "stk1160",
743 .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
744 .fops = &stk1160_fops,
745 .ioctl_ops = &stk1160_ioctl_ops,
746 .release = video_device_release_empty,
747 };
748
749 /********************************************************************/
750
751 /* Must be called with both v4l_lock and vb_queue_lock hold */
stk1160_clear_queue(struct stk1160 * dev,enum vb2_buffer_state vb2_state)752 void stk1160_clear_queue(struct stk1160 *dev, enum vb2_buffer_state vb2_state)
753 {
754 struct stk1160_buffer *buf;
755 unsigned long flags;
756
757 /* Release all active buffers */
758 spin_lock_irqsave(&dev->buf_lock, flags);
759 while (!list_empty(&dev->avail_bufs)) {
760 buf = list_first_entry(&dev->avail_bufs,
761 struct stk1160_buffer, list);
762 list_del(&buf->list);
763 vb2_buffer_done(&buf->vb.vb2_buf, vb2_state);
764 stk1160_dbg("buffer [%p/%d] aborted\n",
765 buf, buf->vb.vb2_buf.index);
766 }
767
768 /* It's important to release the current buffer */
769 if (dev->isoc_ctl.buf) {
770 buf = dev->isoc_ctl.buf;
771 dev->isoc_ctl.buf = NULL;
772
773 vb2_buffer_done(&buf->vb.vb2_buf, vb2_state);
774 stk1160_dbg("buffer [%p/%d] aborted\n",
775 buf, buf->vb.vb2_buf.index);
776 }
777 spin_unlock_irqrestore(&dev->buf_lock, flags);
778 }
779
stk1160_vb2_setup(struct stk1160 * dev)780 int stk1160_vb2_setup(struct stk1160 *dev)
781 {
782 int rc;
783 struct vb2_queue *q;
784
785 q = &dev->vb_vidq;
786 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
787 q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
788 q->drv_priv = dev;
789 q->buf_struct_size = sizeof(struct stk1160_buffer);
790 q->ops = &stk1160_video_qops;
791 q->mem_ops = &vb2_vmalloc_memops;
792 q->lock = &dev->vb_queue_lock;
793 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
794
795 rc = vb2_queue_init(q);
796 if (rc < 0)
797 return rc;
798
799 /* initialize video dma queue */
800 INIT_LIST_HEAD(&dev->avail_bufs);
801
802 return 0;
803 }
804
stk1160_video_register(struct stk1160 * dev)805 int stk1160_video_register(struct stk1160 *dev)
806 {
807 int rc;
808
809 /* Initialize video_device with a template structure */
810 dev->vdev = v4l_template;
811 dev->vdev.queue = &dev->vb_vidq;
812
813 /*
814 * Provide mutexes for v4l2 core and for videobuf2 queue.
815 * It will be used to protect *only* v4l2 ioctls.
816 */
817 dev->vdev.lock = &dev->v4l_lock;
818
819 /* This will be used to set video_device parent */
820 dev->vdev.v4l2_dev = &dev->v4l2_dev;
821 dev->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
822 V4L2_CAP_READWRITE;
823
824 /* NTSC is default */
825 dev->norm = V4L2_STD_NTSC_M;
826 dev->width = 720;
827 dev->height = 480;
828
829 /* set default format */
830 dev->fmt = &format[0];
831 stk1160_set_std(dev);
832
833 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
834 dev->norm);
835
836 video_set_drvdata(&dev->vdev, dev);
837 rc = video_register_device(&dev->vdev, VFL_TYPE_VIDEO, -1);
838 if (rc < 0) {
839 stk1160_err("video_register_device failed (%d)\n", rc);
840 return rc;
841 }
842
843 v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
844 video_device_node_name(&dev->vdev));
845
846 return 0;
847 }
848