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, reg: std525[i].reg, value: 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, reg: std625[i].reg, value: 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, value: ctrl->col_n); |
146 | /* Vertical count units */ |
147 | stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, value: 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, value: 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: dev->udev, ifnum: 0, alternate: 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 | struct stk1160_urb *stk_urb = &dev->isoc_ctl.urb_ctl[i]; |
236 | |
237 | dma_sync_sgtable_for_device(dev: stk1160_get_dmadev(dev), sgt: stk_urb->sgt, |
238 | dir: DMA_FROM_DEVICE); |
239 | rc = usb_submit_urb(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, value: 0xb3); |
253 | stk1160_write_reg(dev, STK1160_DCTRL+3, value: 0x00); |
254 | |
255 | stk1160_dbg("streaming started\n" ); |
256 | |
257 | mutex_unlock(lock: &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: dev->udev, ifnum: 0, alternate: 0); |
265 | stk1160_clear_queue(dev, vb2_state: VB2_BUF_STATE_QUEUED); |
266 | |
267 | mutex_unlock(lock: &dev->v4l_lock); |
268 | |
269 | return rc; |
270 | } |
271 | |
272 | /* Must be called with v4l_lock hold */ |
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: dev->udev, ifnum: 0, alternate: 0); |
283 | |
284 | /* Stop stk1160 */ |
285 | stk1160_write_reg(dev, STK1160_DCTRL, value: 0x00); |
286 | stk1160_write_reg(dev, STK1160_DCTRL+3, value: 0x00); |
287 | |
288 | /* Stop saa711x */ |
289 | v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0); |
290 | } |
291 | |
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_state: VB2_BUF_STATE_ERROR); |
314 | |
315 | stk1160_dbg("streaming stopped\n" ); |
316 | |
317 | mutex_unlock(lock: &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 | */ |
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: dev->udev, buf: cap->bus_info, size: sizeof(cap->bus_info)); |
343 | return 0; |
344 | } |
345 | |
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 | |
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 | |
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(x: width, y: 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(x: base_width, y: 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(x: height, y: 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(x: base_height, y: 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 | |
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 | |
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: &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: &ctrl); |
500 | |
501 | return 0; |
502 | } |
503 | |
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 | |
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 | |
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 | |
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(buf: i->name, fmt: "S-Video" ); |
562 | else |
563 | sprintf(buf: i->name, fmt: "Composite%d" , i->index); |
564 | |
565 | i->type = V4L2_INPUT_TYPE_CAMERA; |
566 | i->std = dev->vdev.tvnorms; |
567 | return 0; |
568 | } |
569 | |
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 | |
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 |
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->reg, value: &val); |
601 | reg->val = val; |
602 | reg->size = 1; |
603 | |
604 | return rc; |
605 | } |
606 | |
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, value: 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 | */ |
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(q: 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 | |
684 | static void buffer_queue(struct vb2_buffer *vb) |
685 | { |
686 | unsigned long flags; |
687 | struct stk1160 *dev = vb2_get_drv_priv(q: 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(vb: &buf->vb.vb2_buf, state: VB2_BUF_STATE_ERROR); |
699 | } else { |
700 | |
701 | buf->mem = vb2_plane_vaddr(vb, plane_no: 0); |
702 | buf->length = vb2_plane_size(vb, plane_no: 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(vb: &buf->vb.vb2_buf, state: VB2_BUF_STATE_ERROR); |
712 | else |
713 | list_add_tail(new: &buf->list, head: &dev->avail_bufs); |
714 | |
715 | } |
716 | spin_unlock_irqrestore(lock: &dev->buf_lock, flags); |
717 | } |
718 | |
719 | static int start_streaming(struct vb2_queue *vq, unsigned int count) |
720 | { |
721 | struct stk1160 *dev = vb2_get_drv_priv(q: vq); |
722 | return stk1160_start_streaming(dev); |
723 | } |
724 | |
725 | /* abort streaming and wait for last buffer */ |
726 | static void stop_streaming(struct vb2_queue *vq) |
727 | { |
728 | struct stk1160 *dev = vb2_get_drv_priv(q: 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 */ |
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(head: &dev->avail_bufs)) { |
760 | buf = list_first_entry(&dev->avail_bufs, |
761 | struct stk1160_buffer, list); |
762 | list_del(entry: &buf->list); |
763 | vb2_buffer_done(vb: &buf->vb.vb2_buf, state: 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(vb: &buf->vb.vb2_buf, state: vb2_state); |
774 | stk1160_dbg("buffer [%p/%d] aborted\n" , |
775 | buf, buf->vb.vb2_buf.index); |
776 | } |
777 | spin_unlock_irqrestore(lock: &dev->buf_lock, flags); |
778 | } |
779 | |
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(list: &dev->avail_bufs); |
801 | |
802 | return 0; |
803 | } |
804 | |
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(vdev: &dev->vdev, data: dev); |
837 | rc = video_register_device(vdev: &dev->vdev, type: VFL_TYPE_VIDEO, nr: -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 | |