1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Driver for the Conexant CX25821 PCIe bridge
4  *
5  *  Copyright (C) 2009 Conexant Systems Inc.
6  *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
7  *  Based on Steven Toth <stoth@linuxtv.org> cx25821 driver
8  *  Parts adapted/taken from Eduardo Moscoso Rubino
9  *  Copyright (C) 2009 Eduardo Moscoso Rubino <moscoso@TopoLogica.com>
10  */
11 
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 
14 #include "cx25821-video.h"
15 
16 MODULE_DESCRIPTION("v4l2 driver module for cx25821 based TV cards");
17 MODULE_AUTHOR("Hiep Huynh <hiep.huynh@conexant.com>");
18 MODULE_LICENSE("GPL");
19 
20 static unsigned int video_nr[] = {[0 ... (CX25821_MAXBOARDS - 1)] = UNSET };
21 
22 module_param_array(video_nr, int, NULL, 0444);
23 
24 MODULE_PARM_DESC(video_nr, "video device numbers");
25 
26 static unsigned int video_debug = VIDEO_DEBUG;
27 module_param(video_debug, int, 0644);
28 MODULE_PARM_DESC(video_debug, "enable debug messages [video]");
29 
30 static unsigned int irq_debug;
31 module_param(irq_debug, int, 0644);
32 MODULE_PARM_DESC(irq_debug, "enable debug messages [IRQ handler]");
33 
34 #define FORMAT_FLAGS_PACKED       0x01
35 
36 static const struct cx25821_fmt formats[] = {
37 	{
38 		.fourcc = V4L2_PIX_FMT_Y41P,
39 		.depth = 12,
40 		.flags = FORMAT_FLAGS_PACKED,
41 	}, {
42 		.fourcc = V4L2_PIX_FMT_YUYV,
43 		.depth = 16,
44 		.flags = FORMAT_FLAGS_PACKED,
45 	},
46 };
47 
48 static const struct cx25821_fmt *cx25821_format_by_fourcc(unsigned int fourcc)
49 {
50 	unsigned int i;
51 
52 	for (i = 0; i < ARRAY_SIZE(formats); i++)
53 		if (formats[i].fourcc == fourcc)
54 			return formats + i;
55 	return NULL;
56 }
57 
58 int cx25821_start_video_dma(struct cx25821_dev *dev,
59 			    struct cx25821_dmaqueue *q,
60 			    struct cx25821_buffer *buf,
61 			    const struct sram_channel *channel)
62 {
63 	int tmp = 0;
64 
65 	/* setup fifo + format */
66 	cx25821_sram_channel_setup(dev, channel, buf->bpl, buf->risc.dma);
67 
68 	/* reset counter */
69 	cx_write(channel->gpcnt_ctl, 3);
70 
71 	/* enable irq */
72 	cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << channel->i));
73 	cx_set(channel->int_msk, 0x11);
74 
75 	/* start dma */
76 	cx_write(channel->dma_ctl, 0x11);	/* FIFO and RISC enable */
77 
78 	/* make sure upstream setting if any is reversed */
79 	tmp = cx_read(VID_CH_MODE_SEL);
80 	cx_write(VID_CH_MODE_SEL, tmp & 0xFFFFFE00);
81 
82 	return 0;
83 }
84 
85 int cx25821_video_irq(struct cx25821_dev *dev, int chan_num, u32 status)
86 {
87 	int handled = 0;
88 	u32 mask;
89 	const struct sram_channel *channel = dev->channels[chan_num].sram_channels;
90 
91 	mask = cx_read(channel->int_msk);
92 	if (0 == (status & mask))
93 		return handled;
94 
95 	cx_write(channel->int_stat, status);
96 
97 	/* risc op code error */
98 	if (status & (1 << 16)) {
99 		pr_warn("%s, %s: video risc op code error\n",
100 			dev->name, channel->name);
101 		cx_clear(channel->dma_ctl, 0x11);
102 		cx25821_sram_channel_dump(dev, channel);
103 	}
104 
105 	/* risc1 y */
106 	if (status & FLD_VID_DST_RISC1) {
107 		struct cx25821_dmaqueue *dmaq =
108 			&dev->channels[channel->i].dma_vidq;
109 		struct cx25821_buffer *buf;
110 
111 		spin_lock(&dev->slock);
112 		if (!list_empty(&dmaq->active)) {
113 			buf = list_entry(dmaq->active.next,
114 					 struct cx25821_buffer, queue);
115 
116 			buf->vb.vb2_buf.timestamp = ktime_get_ns();
117 			buf->vb.sequence = dmaq->count++;
118 			list_del(&buf->queue);
119 			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
120 		}
121 		spin_unlock(&dev->slock);
122 		handled++;
123 	}
124 	return handled;
125 }
126 
127 static int cx25821_queue_setup(struct vb2_queue *q,
128 			   unsigned int *num_buffers, unsigned int *num_planes,
129 			   unsigned int sizes[], struct device *alloc_devs[])
130 {
131 	struct cx25821_channel *chan = q->drv_priv;
132 	unsigned size = (chan->fmt->depth * chan->width * chan->height) >> 3;
133 
134 	if (*num_planes)
135 		return sizes[0] < size ? -EINVAL : 0;
136 
137 	*num_planes = 1;
138 	sizes[0] = size;
139 	return 0;
140 }
141 
142 static int cx25821_buffer_prepare(struct vb2_buffer *vb)
143 {
144 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
145 	struct cx25821_channel *chan = vb->vb2_queue->drv_priv;
146 	struct cx25821_dev *dev = chan->dev;
147 	struct cx25821_buffer *buf =
148 		container_of(vbuf, struct cx25821_buffer, vb);
149 	struct sg_table *sgt = vb2_dma_sg_plane_desc(vb, 0);
150 	u32 line0_offset;
151 	int bpl_local = LINE_SIZE_D1;
152 	int ret;
153 
154 	if (chan->pixel_formats == PIXEL_FRMT_411)
155 		buf->bpl = (chan->fmt->depth * chan->width) >> 3;
156 	else
157 		buf->bpl = (chan->fmt->depth >> 3) * chan->width;
158 
159 	if (vb2_plane_size(vb, 0) < chan->height * buf->bpl)
160 		return -EINVAL;
161 	vb2_set_plane_payload(vb, 0, chan->height * buf->bpl);
162 	buf->vb.field = chan->field;
163 
164 	if (chan->pixel_formats == PIXEL_FRMT_411) {
165 		bpl_local = buf->bpl;
166 	} else {
167 		bpl_local = buf->bpl;   /* Default */
168 
169 		if (chan->use_cif_resolution) {
170 			if (dev->tvnorm & V4L2_STD_625_50)
171 				bpl_local = 352 << 1;
172 			else
173 				bpl_local = chan->cif_width << 1;
174 		}
175 	}
176 
177 	switch (chan->field) {
178 	case V4L2_FIELD_TOP:
179 		ret = cx25821_risc_buffer(dev->pci, &buf->risc,
180 				sgt->sgl, 0, UNSET,
181 				buf->bpl, 0, chan->height);
182 		break;
183 	case V4L2_FIELD_BOTTOM:
184 		ret = cx25821_risc_buffer(dev->pci, &buf->risc,
185 				sgt->sgl, UNSET, 0,
186 				buf->bpl, 0, chan->height);
187 		break;
188 	case V4L2_FIELD_INTERLACED:
189 		/* All other formats are top field first */
190 		line0_offset = 0;
191 		dprintk(1, "top field first\n");
192 
193 		ret = cx25821_risc_buffer(dev->pci, &buf->risc,
194 				sgt->sgl, line0_offset,
195 				bpl_local, bpl_local, bpl_local,
196 				chan->height >> 1);
197 		break;
198 	case V4L2_FIELD_SEQ_TB:
199 		ret = cx25821_risc_buffer(dev->pci, &buf->risc,
200 				sgt->sgl,
201 				0, buf->bpl * (chan->height >> 1),
202 				buf->bpl, 0, chan->height >> 1);
203 		break;
204 	case V4L2_FIELD_SEQ_BT:
205 		ret = cx25821_risc_buffer(dev->pci, &buf->risc,
206 				sgt->sgl,
207 				buf->bpl * (chan->height >> 1), 0,
208 				buf->bpl, 0, chan->height >> 1);
209 		break;
210 	default:
211 		WARN_ON(1);
212 		ret = -EINVAL;
213 		break;
214 	}
215 
216 	dprintk(2, "[%p/%d] buffer_prep - %dx%d %dbpp 0x%08x - dma=0x%08lx\n",
217 		buf, buf->vb.vb2_buf.index, chan->width, chan->height,
218 		chan->fmt->depth, chan->fmt->fourcc,
219 		(unsigned long)buf->risc.dma);
220 
221 	return ret;
222 }
223 
224 static void cx25821_buffer_finish(struct vb2_buffer *vb)
225 {
226 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
227 	struct cx25821_buffer *buf =
228 		container_of(vbuf, struct cx25821_buffer, vb);
229 	struct cx25821_channel *chan = vb->vb2_queue->drv_priv;
230 	struct cx25821_dev *dev = chan->dev;
231 
232 	cx25821_free_buffer(dev, buf);
233 }
234 
235 static void cx25821_buffer_queue(struct vb2_buffer *vb)
236 {
237 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
238 	struct cx25821_buffer *buf =
239 		container_of(vbuf, struct cx25821_buffer, vb);
240 	struct cx25821_channel *chan = vb->vb2_queue->drv_priv;
241 	struct cx25821_dev *dev = chan->dev;
242 	struct cx25821_buffer *prev;
243 	struct cx25821_dmaqueue *q = &dev->channels[chan->id].dma_vidq;
244 
245 	buf->risc.cpu[1] = cpu_to_le32(buf->risc.dma + 12);
246 	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_CNT_INC);
247 	buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma + 12);
248 	buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
249 
250 	if (list_empty(&q->active)) {
251 		list_add_tail(&buf->queue, &q->active);
252 	} else {
253 		buf->risc.cpu[0] |= cpu_to_le32(RISC_IRQ1);
254 		prev = list_entry(q->active.prev, struct cx25821_buffer,
255 				queue);
256 		list_add_tail(&buf->queue, &q->active);
257 		prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
258 	}
259 }
260 
261 static int cx25821_start_streaming(struct vb2_queue *q, unsigned int count)
262 {
263 	struct cx25821_channel *chan = q->drv_priv;
264 	struct cx25821_dev *dev = chan->dev;
265 	struct cx25821_dmaqueue *dmaq = &dev->channels[chan->id].dma_vidq;
266 	struct cx25821_buffer *buf = list_entry(dmaq->active.next,
267 			struct cx25821_buffer, queue);
268 
269 	dmaq->count = 0;
270 	cx25821_start_video_dma(dev, dmaq, buf, chan->sram_channels);
271 	return 0;
272 }
273 
274 static void cx25821_stop_streaming(struct vb2_queue *q)
275 {
276 	struct cx25821_channel *chan = q->drv_priv;
277 	struct cx25821_dev *dev = chan->dev;
278 	struct cx25821_dmaqueue *dmaq = &dev->channels[chan->id].dma_vidq;
279 	unsigned long flags;
280 
281 	cx_write(chan->sram_channels->dma_ctl, 0); /* FIFO and RISC disable */
282 	spin_lock_irqsave(&dev->slock, flags);
283 	while (!list_empty(&dmaq->active)) {
284 		struct cx25821_buffer *buf = list_entry(dmaq->active.next,
285 			struct cx25821_buffer, queue);
286 
287 		list_del(&buf->queue);
288 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
289 	}
290 	spin_unlock_irqrestore(&dev->slock, flags);
291 }
292 
293 static const struct vb2_ops cx25821_video_qops = {
294 	.queue_setup    = cx25821_queue_setup,
295 	.buf_prepare  = cx25821_buffer_prepare,
296 	.buf_finish = cx25821_buffer_finish,
297 	.buf_queue    = cx25821_buffer_queue,
298 	.wait_prepare = vb2_ops_wait_prepare,
299 	.wait_finish = vb2_ops_wait_finish,
300 	.start_streaming = cx25821_start_streaming,
301 	.stop_streaming = cx25821_stop_streaming,
302 };
303 
304 /* VIDEO IOCTLS */
305 
306 static int cx25821_vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
307 			    struct v4l2_fmtdesc *f)
308 {
309 	if (unlikely(f->index >= ARRAY_SIZE(formats)))
310 		return -EINVAL;
311 
312 	f->pixelformat = formats[f->index].fourcc;
313 
314 	return 0;
315 }
316 
317 static int cx25821_vidioc_g_fmt_vid_cap(struct file *file, void *priv,
318 				 struct v4l2_format *f)
319 {
320 	struct cx25821_channel *chan = video_drvdata(file);
321 
322 	f->fmt.pix.width = chan->width;
323 	f->fmt.pix.height = chan->height;
324 	f->fmt.pix.field = chan->field;
325 	f->fmt.pix.pixelformat = chan->fmt->fourcc;
326 	f->fmt.pix.bytesperline = (chan->width * chan->fmt->depth) >> 3;
327 	f->fmt.pix.sizeimage = chan->height * f->fmt.pix.bytesperline;
328 	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
329 
330 	return 0;
331 }
332 
333 static int cx25821_vidioc_try_fmt_vid_cap(struct file *file, void *priv,
334 				   struct v4l2_format *f)
335 {
336 	struct cx25821_channel *chan = video_drvdata(file);
337 	struct cx25821_dev *dev = chan->dev;
338 	const struct cx25821_fmt *fmt;
339 	enum v4l2_field field = f->fmt.pix.field;
340 	unsigned int maxh;
341 	unsigned w;
342 
343 	fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
344 	if (NULL == fmt)
345 		return -EINVAL;
346 	maxh = (dev->tvnorm & V4L2_STD_625_50) ? 576 : 480;
347 
348 	w = f->fmt.pix.width;
349 	if (field != V4L2_FIELD_BOTTOM)
350 		field = V4L2_FIELD_TOP;
351 	if (w < 352) {
352 		w = 176;
353 		f->fmt.pix.height = maxh / 4;
354 	} else if (w < 720) {
355 		w = 352;
356 		f->fmt.pix.height = maxh / 2;
357 	} else {
358 		w = 720;
359 		f->fmt.pix.height = maxh;
360 		field = V4L2_FIELD_INTERLACED;
361 	}
362 	f->fmt.pix.field = field;
363 	f->fmt.pix.width = w;
364 	f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
365 	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
366 	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
367 
368 	return 0;
369 }
370 
371 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
372 				struct v4l2_format *f)
373 {
374 	struct cx25821_channel *chan = video_drvdata(file);
375 	struct cx25821_dev *dev = chan->dev;
376 	int pix_format = PIXEL_FRMT_422;
377 	int err;
378 
379 	err = cx25821_vidioc_try_fmt_vid_cap(file, priv, f);
380 
381 	if (0 != err)
382 		return err;
383 
384 	chan->fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
385 	chan->field = f->fmt.pix.field;
386 	chan->width = f->fmt.pix.width;
387 	chan->height = f->fmt.pix.height;
388 
389 	if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_Y41P)
390 		pix_format = PIXEL_FRMT_411;
391 	else
392 		pix_format = PIXEL_FRMT_422;
393 
394 	cx25821_set_pixel_format(dev, SRAM_CH00, pix_format);
395 
396 	/* check if cif resolution */
397 	if (chan->width == 320 || chan->width == 352)
398 		chan->use_cif_resolution = 1;
399 	else
400 		chan->use_cif_resolution = 0;
401 
402 	chan->cif_width = chan->width;
403 	medusa_set_resolution(dev, chan->width, SRAM_CH00);
404 	return 0;
405 }
406 
407 static int vidioc_log_status(struct file *file, void *priv)
408 {
409 	struct cx25821_channel *chan = video_drvdata(file);
410 	struct cx25821_dev *dev = chan->dev;
411 	const struct sram_channel *sram_ch = chan->sram_channels;
412 	u32 tmp = 0;
413 
414 	tmp = cx_read(sram_ch->dma_ctl);
415 	pr_info("Video input 0 is %s\n",
416 		(tmp & 0x11) ? "streaming" : "stopped");
417 	return 0;
418 }
419 
420 
421 static int cx25821_vidioc_querycap(struct file *file, void *priv,
422 			    struct v4l2_capability *cap)
423 {
424 	struct cx25821_channel *chan = video_drvdata(file);
425 	struct cx25821_dev *dev = chan->dev;
426 
427 	strscpy(cap->driver, "cx25821", sizeof(cap->driver));
428 	strscpy(cap->card, cx25821_boards[dev->board].name, sizeof(cap->card));
429 	sprintf(cap->bus_info, "PCIe:%s", pci_name(dev->pci));
430 	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT |
431 			    V4L2_CAP_READWRITE | V4L2_CAP_STREAMING |
432 			    V4L2_CAP_DEVICE_CAPS;
433 	return 0;
434 }
435 
436 static int cx25821_vidioc_g_std(struct file *file, void *priv, v4l2_std_id *tvnorms)
437 {
438 	struct cx25821_channel *chan = video_drvdata(file);
439 
440 	*tvnorms = chan->dev->tvnorm;
441 	return 0;
442 }
443 
444 static int cx25821_vidioc_s_std(struct file *file, void *priv,
445 				v4l2_std_id tvnorms)
446 {
447 	struct cx25821_channel *chan = video_drvdata(file);
448 	struct cx25821_dev *dev = chan->dev;
449 
450 	if (dev->tvnorm == tvnorms)
451 		return 0;
452 
453 	dev->tvnorm = tvnorms;
454 	chan->width = 720;
455 	chan->height = (dev->tvnorm & V4L2_STD_625_50) ? 576 : 480;
456 
457 	medusa_set_videostandard(dev);
458 
459 	return 0;
460 }
461 
462 static int cx25821_vidioc_enum_input(struct file *file, void *priv,
463 			      struct v4l2_input *i)
464 {
465 	if (i->index)
466 		return -EINVAL;
467 
468 	i->type = V4L2_INPUT_TYPE_CAMERA;
469 	i->std = CX25821_NORMS;
470 	strscpy(i->name, "Composite", sizeof(i->name));
471 	return 0;
472 }
473 
474 static int cx25821_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
475 {
476 	*i = 0;
477 	return 0;
478 }
479 
480 static int cx25821_vidioc_s_input(struct file *file, void *priv, unsigned int i)
481 {
482 	return i ? -EINVAL : 0;
483 }
484 
485 static int cx25821_s_ctrl(struct v4l2_ctrl *ctrl)
486 {
487 	struct cx25821_channel *chan =
488 		container_of(ctrl->handler, struct cx25821_channel, hdl);
489 	struct cx25821_dev *dev = chan->dev;
490 
491 	switch (ctrl->id) {
492 	case V4L2_CID_BRIGHTNESS:
493 		medusa_set_brightness(dev, ctrl->val, chan->id);
494 		break;
495 	case V4L2_CID_HUE:
496 		medusa_set_hue(dev, ctrl->val, chan->id);
497 		break;
498 	case V4L2_CID_CONTRAST:
499 		medusa_set_contrast(dev, ctrl->val, chan->id);
500 		break;
501 	case V4L2_CID_SATURATION:
502 		medusa_set_saturation(dev, ctrl->val, chan->id);
503 		break;
504 	default:
505 		return -EINVAL;
506 	}
507 	return 0;
508 }
509 
510 static int cx25821_vidioc_enum_output(struct file *file, void *priv,
511 			      struct v4l2_output *o)
512 {
513 	if (o->index)
514 		return -EINVAL;
515 
516 	o->type = V4L2_INPUT_TYPE_CAMERA;
517 	o->std = CX25821_NORMS;
518 	strscpy(o->name, "Composite", sizeof(o->name));
519 	return 0;
520 }
521 
522 static int cx25821_vidioc_g_output(struct file *file, void *priv, unsigned int *o)
523 {
524 	*o = 0;
525 	return 0;
526 }
527 
528 static int cx25821_vidioc_s_output(struct file *file, void *priv, unsigned int o)
529 {
530 	return o ? -EINVAL : 0;
531 }
532 
533 static int cx25821_vidioc_try_fmt_vid_out(struct file *file, void *priv,
534 				   struct v4l2_format *f)
535 {
536 	struct cx25821_channel *chan = video_drvdata(file);
537 	struct cx25821_dev *dev = chan->dev;
538 	const struct cx25821_fmt *fmt;
539 
540 	fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
541 	if (NULL == fmt)
542 		return -EINVAL;
543 	f->fmt.pix.width = 720;
544 	f->fmt.pix.height = (dev->tvnorm & V4L2_STD_625_50) ? 576 : 480;
545 	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
546 	f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
547 	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
548 	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
549 	return 0;
550 }
551 
552 static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
553 				struct v4l2_format *f)
554 {
555 	struct cx25821_channel *chan = video_drvdata(file);
556 	int err;
557 
558 	err = cx25821_vidioc_try_fmt_vid_out(file, priv, f);
559 
560 	if (0 != err)
561 		return err;
562 
563 	chan->fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
564 	chan->field = f->fmt.pix.field;
565 	chan->width = f->fmt.pix.width;
566 	chan->height = f->fmt.pix.height;
567 	if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_Y41P)
568 		chan->pixel_formats = PIXEL_FRMT_411;
569 	else
570 		chan->pixel_formats = PIXEL_FRMT_422;
571 	return 0;
572 }
573 
574 static const struct v4l2_ctrl_ops cx25821_ctrl_ops = {
575 	.s_ctrl = cx25821_s_ctrl,
576 };
577 
578 static const struct v4l2_file_operations video_fops = {
579 	.owner = THIS_MODULE,
580 	.open = v4l2_fh_open,
581 	.release        = vb2_fop_release,
582 	.read           = vb2_fop_read,
583 	.poll		= vb2_fop_poll,
584 	.unlocked_ioctl = video_ioctl2,
585 	.mmap           = vb2_fop_mmap,
586 };
587 
588 static const struct v4l2_ioctl_ops video_ioctl_ops = {
589 	.vidioc_querycap = cx25821_vidioc_querycap,
590 	.vidioc_enum_fmt_vid_cap = cx25821_vidioc_enum_fmt_vid_cap,
591 	.vidioc_g_fmt_vid_cap = cx25821_vidioc_g_fmt_vid_cap,
592 	.vidioc_try_fmt_vid_cap = cx25821_vidioc_try_fmt_vid_cap,
593 	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
594 	.vidioc_reqbufs       = vb2_ioctl_reqbufs,
595 	.vidioc_prepare_buf   = vb2_ioctl_prepare_buf,
596 	.vidioc_create_bufs   = vb2_ioctl_create_bufs,
597 	.vidioc_querybuf      = vb2_ioctl_querybuf,
598 	.vidioc_qbuf          = vb2_ioctl_qbuf,
599 	.vidioc_dqbuf         = vb2_ioctl_dqbuf,
600 	.vidioc_streamon      = vb2_ioctl_streamon,
601 	.vidioc_streamoff     = vb2_ioctl_streamoff,
602 	.vidioc_g_std = cx25821_vidioc_g_std,
603 	.vidioc_s_std = cx25821_vidioc_s_std,
604 	.vidioc_enum_input = cx25821_vidioc_enum_input,
605 	.vidioc_g_input = cx25821_vidioc_g_input,
606 	.vidioc_s_input = cx25821_vidioc_s_input,
607 	.vidioc_log_status = vidioc_log_status,
608 	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
609 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
610 };
611 
612 static const struct video_device cx25821_video_device = {
613 	.name = "cx25821-video",
614 	.fops = &video_fops,
615 	.release = video_device_release_empty,
616 	.minor = -1,
617 	.ioctl_ops = &video_ioctl_ops,
618 	.tvnorms = CX25821_NORMS,
619 	.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
620 		       V4L2_CAP_STREAMING,
621 };
622 
623 static const struct v4l2_file_operations video_out_fops = {
624 	.owner = THIS_MODULE,
625 	.open = v4l2_fh_open,
626 	.release        = vb2_fop_release,
627 	.write          = vb2_fop_write,
628 	.poll		= vb2_fop_poll,
629 	.unlocked_ioctl = video_ioctl2,
630 	.mmap           = vb2_fop_mmap,
631 };
632 
633 static const struct v4l2_ioctl_ops video_out_ioctl_ops = {
634 	.vidioc_querycap = cx25821_vidioc_querycap,
635 	.vidioc_enum_fmt_vid_out = cx25821_vidioc_enum_fmt_vid_cap,
636 	.vidioc_g_fmt_vid_out = cx25821_vidioc_g_fmt_vid_cap,
637 	.vidioc_try_fmt_vid_out = cx25821_vidioc_try_fmt_vid_out,
638 	.vidioc_s_fmt_vid_out = vidioc_s_fmt_vid_out,
639 	.vidioc_g_std = cx25821_vidioc_g_std,
640 	.vidioc_s_std = cx25821_vidioc_s_std,
641 	.vidioc_enum_output = cx25821_vidioc_enum_output,
642 	.vidioc_g_output = cx25821_vidioc_g_output,
643 	.vidioc_s_output = cx25821_vidioc_s_output,
644 	.vidioc_log_status = vidioc_log_status,
645 };
646 
647 static const struct video_device cx25821_video_out_device = {
648 	.name = "cx25821-video",
649 	.fops = &video_out_fops,
650 	.release = video_device_release_empty,
651 	.minor = -1,
652 	.ioctl_ops = &video_out_ioctl_ops,
653 	.tvnorms = CX25821_NORMS,
654 	.device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_READWRITE,
655 };
656 
657 void cx25821_video_unregister(struct cx25821_dev *dev, int chan_num)
658 {
659 	cx_clear(PCI_INT_MSK, 1);
660 
661 	if (video_is_registered(&dev->channels[chan_num].vdev)) {
662 		video_unregister_device(&dev->channels[chan_num].vdev);
663 		v4l2_ctrl_handler_free(&dev->channels[chan_num].hdl);
664 	}
665 }
666 
667 int cx25821_video_register(struct cx25821_dev *dev)
668 {
669 	int err;
670 	int i;
671 
672 	/* initial device configuration */
673 	dev->tvnorm = V4L2_STD_NTSC_M;
674 
675 	spin_lock_init(&dev->slock);
676 
677 	for (i = 0; i < MAX_VID_CAP_CHANNEL_NUM - 1; ++i) {
678 		struct cx25821_channel *chan = &dev->channels[i];
679 		struct video_device *vdev = &chan->vdev;
680 		struct v4l2_ctrl_handler *hdl = &chan->hdl;
681 		struct vb2_queue *q;
682 		bool is_output = i > SRAM_CH08;
683 
684 		if (i == SRAM_CH08) /* audio channel */
685 			continue;
686 
687 		if (!is_output) {
688 			v4l2_ctrl_handler_init(hdl, 4);
689 			v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
690 					V4L2_CID_BRIGHTNESS, 0, 10000, 1, 6200);
691 			v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
692 					V4L2_CID_CONTRAST, 0, 10000, 1, 5000);
693 			v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
694 					V4L2_CID_SATURATION, 0, 10000, 1, 5000);
695 			v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
696 					V4L2_CID_HUE, 0, 10000, 1, 5000);
697 			if (hdl->error) {
698 				err = hdl->error;
699 				goto fail_unreg;
700 			}
701 			err = v4l2_ctrl_handler_setup(hdl);
702 			if (err)
703 				goto fail_unreg;
704 		} else {
705 			chan->out = &dev->vid_out_data[i - SRAM_CH09];
706 			chan->out->chan = chan;
707 		}
708 
709 		chan->sram_channels = &cx25821_sram_channels[i];
710 		chan->width = 720;
711 		chan->field = V4L2_FIELD_INTERLACED;
712 		if (dev->tvnorm & V4L2_STD_625_50)
713 			chan->height = 576;
714 		else
715 			chan->height = 480;
716 
717 		if (chan->pixel_formats == PIXEL_FRMT_411)
718 			chan->fmt = cx25821_format_by_fourcc(V4L2_PIX_FMT_Y41P);
719 		else
720 			chan->fmt = cx25821_format_by_fourcc(V4L2_PIX_FMT_YUYV);
721 
722 		cx_write(chan->sram_channels->int_stat, 0xffffffff);
723 
724 		INIT_LIST_HEAD(&chan->dma_vidq.active);
725 
726 		q = &chan->vidq;
727 
728 		q->type = is_output ? V4L2_BUF_TYPE_VIDEO_OUTPUT :
729 				      V4L2_BUF_TYPE_VIDEO_CAPTURE;
730 		q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
731 		q->io_modes |= is_output ? VB2_WRITE : VB2_READ;
732 		q->gfp_flags = GFP_DMA32;
733 		q->min_buffers_needed = 2;
734 		q->drv_priv = chan;
735 		q->buf_struct_size = sizeof(struct cx25821_buffer);
736 		q->ops = &cx25821_video_qops;
737 		q->mem_ops = &vb2_dma_sg_memops;
738 		q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
739 		q->lock = &dev->lock;
740 		q->dev = &dev->pci->dev;
741 
742 		if (!is_output) {
743 			err = vb2_queue_init(q);
744 			if (err < 0)
745 				goto fail_unreg;
746 		}
747 
748 		/* register v4l devices */
749 		*vdev = is_output ? cx25821_video_out_device : cx25821_video_device;
750 		vdev->v4l2_dev = &dev->v4l2_dev;
751 		if (!is_output)
752 			vdev->ctrl_handler = hdl;
753 		else
754 			vdev->vfl_dir = VFL_DIR_TX;
755 		vdev->lock = &dev->lock;
756 		vdev->queue = q;
757 		snprintf(vdev->name, sizeof(vdev->name), "%s #%d", dev->name, i);
758 		video_set_drvdata(vdev, chan);
759 
760 		err = video_register_device(vdev, VFL_TYPE_VIDEO,
761 					    video_nr[dev->nr]);
762 
763 		if (err < 0)
764 			goto fail_unreg;
765 	}
766 
767 	/* set PCI interrupt */
768 	cx_set(PCI_INT_MSK, 0xff);
769 
770 	return 0;
771 
772 fail_unreg:
773 	while (i >= 0)
774 		cx25821_video_unregister(dev, i--);
775 	return err;
776 }
777