1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB
4 //		    video capture devices
5 //
6 // Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
7 //		      Markus Rechberger <mrechberger@gmail.com>
8 //		      Mauro Carvalho Chehab <mchehab@kernel.org>
9 //		      Sascha Sommer <saschasommer@freenet.de>
10 // Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
11 //
12 //	Some parts based on SN9C10x PC Camera Controllers GPL driver made
13 //		by Luca Risolia <luca.risolia@studio.unibo.it>
14 //
15 // This program is free software; you can redistribute it and/or modify
16 // it under the terms of the GNU General Public License as published by
17 // the Free Software Foundation; either version 2 of the License, or
18 // (at your option) any later version.
19 //
20 // This program is distributed in the hope that it will be useful,
21 // but WITHOUT ANY WARRANTY; without even the implied warranty of
22 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23 // GNU General Public License for more details.
24 
25 #include "em28xx.h"
26 
27 #include <linux/init.h>
28 #include <linux/list.h>
29 #include <linux/module.h>
30 #include <linux/kernel.h>
31 #include <linux/bitmap.h>
32 #include <linux/usb.h>
33 #include <linux/i2c.h>
34 #include <linux/mm.h>
35 #include <linux/mutex.h>
36 #include <linux/slab.h>
37 
38 #include "em28xx-v4l.h"
39 #include <media/v4l2-common.h>
40 #include <media/v4l2-ioctl.h>
41 #include <media/v4l2-event.h>
42 #include <media/drv-intf/msp3400.h>
43 #include <media/tuner.h>
44 
45 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
46 		      "Markus Rechberger <mrechberger@gmail.com>, " \
47 		      "Mauro Carvalho Chehab <mchehab@kernel.org>, " \
48 		      "Sascha Sommer <saschasommer@freenet.de>"
49 
50 static unsigned int isoc_debug;
51 module_param(isoc_debug, int, 0644);
52 MODULE_PARM_DESC(isoc_debug, "enable debug messages [isoc transfers]");
53 
54 static unsigned int disable_vbi;
55 module_param(disable_vbi, int, 0644);
56 MODULE_PARM_DESC(disable_vbi, "disable vbi support");
57 
58 static int alt;
59 module_param(alt, int, 0644);
60 MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
61 
62 #define em28xx_videodbg(fmt, arg...) do {				\
63 	if (video_debug)						\
64 		dev_printk(KERN_DEBUG, &dev->intf->dev,			\
65 			   "video: %s: " fmt, __func__, ## arg);	\
66 } while (0)
67 
68 #define em28xx_isocdbg(fmt, arg...) do {\
69 	if (isoc_debug) \
70 		dev_printk(KERN_DEBUG, &dev->intf->dev,			\
71 			   "isoc: %s: " fmt, __func__, ## arg);		\
72 } while (0)
73 
74 MODULE_AUTHOR(DRIVER_AUTHOR);
75 MODULE_DESCRIPTION(DRIVER_DESC " - v4l2 interface");
76 MODULE_LICENSE("GPL v2");
77 MODULE_VERSION(EM28XX_VERSION);
78 
79 #define EM25XX_FRMDATAHDR_BYTE1			0x02
80 #define EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE	0x20
81 #define EM25XX_FRMDATAHDR_BYTE2_FRAME_END	0x02
82 #define EM25XX_FRMDATAHDR_BYTE2_FRAME_ID	0x01
83 #define EM25XX_FRMDATAHDR_BYTE2_MASK	(EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE | \
84 					 EM25XX_FRMDATAHDR_BYTE2_FRAME_END |   \
85 					 EM25XX_FRMDATAHDR_BYTE2_FRAME_ID)
86 
87 static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
88 static unsigned int vbi_nr[]   = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
89 static unsigned int radio_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
90 
91 module_param_array(video_nr, int, NULL, 0444);
92 module_param_array(vbi_nr, int, NULL, 0444);
93 module_param_array(radio_nr, int, NULL, 0444);
94 MODULE_PARM_DESC(video_nr, "video device numbers");
95 MODULE_PARM_DESC(vbi_nr,   "vbi device numbers");
96 MODULE_PARM_DESC(radio_nr, "radio device numbers");
97 
98 static unsigned int video_debug;
99 module_param(video_debug, int, 0644);
100 MODULE_PARM_DESC(video_debug, "enable debug messages [video]");
101 
102 /* supported video standards */
103 static struct em28xx_fmt format[] = {
104 	{
105 		.name     = "16 bpp YUY2, 4:2:2, packed",
106 		.fourcc   = V4L2_PIX_FMT_YUYV,
107 		.depth    = 16,
108 		.reg	  = EM28XX_OUTFMT_YUV422_Y0UY1V,
109 	}, {
110 		.name     = "16 bpp RGB 565, LE",
111 		.fourcc   = V4L2_PIX_FMT_RGB565,
112 		.depth    = 16,
113 		.reg      = EM28XX_OUTFMT_RGB_16_656,
114 	}, {
115 		.name     = "8 bpp Bayer RGRG..GBGB",
116 		.fourcc   = V4L2_PIX_FMT_SRGGB8,
117 		.depth    = 8,
118 		.reg      = EM28XX_OUTFMT_RGB_8_RGRG,
119 	}, {
120 		.name     = "8 bpp Bayer BGBG..GRGR",
121 		.fourcc   = V4L2_PIX_FMT_SBGGR8,
122 		.depth    = 8,
123 		.reg      = EM28XX_OUTFMT_RGB_8_BGBG,
124 	}, {
125 		.name     = "8 bpp Bayer GRGR..BGBG",
126 		.fourcc   = V4L2_PIX_FMT_SGRBG8,
127 		.depth    = 8,
128 		.reg      = EM28XX_OUTFMT_RGB_8_GRGR,
129 	}, {
130 		.name     = "8 bpp Bayer GBGB..RGRG",
131 		.fourcc   = V4L2_PIX_FMT_SGBRG8,
132 		.depth    = 8,
133 		.reg      = EM28XX_OUTFMT_RGB_8_GBGB,
134 	}, {
135 		.name     = "12 bpp YUV411",
136 		.fourcc   = V4L2_PIX_FMT_YUV411P,
137 		.depth    = 12,
138 		.reg      = EM28XX_OUTFMT_YUV411,
139 	},
140 };
141 
142 /*FIXME: maxw should be dependent of alt mode */
143 static inline unsigned int norm_maxw(struct em28xx *dev)
144 {
145 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
146 
147 	if (dev->is_webcam)
148 		return v4l2->sensor_xres;
149 
150 	if (dev->board.max_range_640_480)
151 		return 640;
152 
153 	return 720;
154 }
155 
156 static inline unsigned int norm_maxh(struct em28xx *dev)
157 {
158 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
159 
160 	if (dev->is_webcam)
161 		return v4l2->sensor_yres;
162 
163 	if (dev->board.max_range_640_480)
164 		return 480;
165 
166 	return (v4l2->norm & V4L2_STD_625_50) ? 576 : 480;
167 }
168 
169 static int em28xx_vbi_supported(struct em28xx *dev)
170 {
171 	/* Modprobe option to manually disable */
172 	if (disable_vbi == 1)
173 		return 0;
174 
175 	if (dev->is_webcam)
176 		return 0;
177 
178 	/* FIXME: check subdevices for VBI support */
179 
180 	if (dev->chip_id == CHIP_ID_EM2860 ||
181 	    dev->chip_id == CHIP_ID_EM2883)
182 		return 1;
183 
184 	/* Version of em28xx that does not support VBI */
185 	return 0;
186 }
187 
188 /*
189  * em28xx_wake_i2c()
190  * configure i2c attached devices
191  */
192 static void em28xx_wake_i2c(struct em28xx *dev)
193 {
194 	struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;
195 
196 	v4l2_device_call_all(v4l2_dev, 0, core,  reset, 0);
197 	v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
198 			     INPUT(dev->ctl_input)->vmux, 0, 0);
199 }
200 
201 static int em28xx_colorlevels_set_default(struct em28xx *dev)
202 {
203 	em28xx_write_reg(dev, EM28XX_R20_YGAIN, CONTRAST_DEFAULT);
204 	em28xx_write_reg(dev, EM28XX_R21_YOFFSET, BRIGHTNESS_DEFAULT);
205 	em28xx_write_reg(dev, EM28XX_R22_UVGAIN, SATURATION_DEFAULT);
206 	em28xx_write_reg(dev, EM28XX_R23_UOFFSET, BLUE_BALANCE_DEFAULT);
207 	em28xx_write_reg(dev, EM28XX_R24_VOFFSET, RED_BALANCE_DEFAULT);
208 	em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, SHARPNESS_DEFAULT);
209 
210 	em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
211 	em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
212 	em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
213 	em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
214 	em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
215 	em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
216 	return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
217 }
218 
219 static int em28xx_set_outfmt(struct em28xx *dev)
220 {
221 	int ret;
222 	u8 fmt, vinctrl;
223 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
224 
225 	fmt = v4l2->format->reg;
226 	if (!dev->is_em25xx)
227 		fmt |= 0x20;
228 	/*
229 	 * NOTE: it's not clear if this is really needed !
230 	 * The datasheets say bit 5 is a reserved bit and devices seem to work
231 	 * fine without it. But the Windows driver sets it for em2710/50+em28xx
232 	 * devices and we've always been setting it, too.
233 	 *
234 	 * em2765 (em25xx, em276x/7x/8x) devices do NOT work with this bit set,
235 	 * it's likely used for an additional (compressed ?) format there.
236 	 */
237 	ret = em28xx_write_reg(dev, EM28XX_R27_OUTFMT, fmt);
238 	if (ret < 0)
239 		return ret;
240 
241 	ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, v4l2->vinmode);
242 	if (ret < 0)
243 		return ret;
244 
245 	vinctrl = v4l2->vinctl;
246 	if (em28xx_vbi_supported(dev) == 1) {
247 		vinctrl |= EM28XX_VINCTRL_VBI_RAW;
248 		em28xx_write_reg(dev, EM28XX_R34_VBI_START_H, 0x00);
249 		em28xx_write_reg(dev, EM28XX_R36_VBI_WIDTH,
250 				 v4l2->vbi_width / 4);
251 		em28xx_write_reg(dev, EM28XX_R37_VBI_HEIGHT, v4l2->vbi_height);
252 		if (v4l2->norm & V4L2_STD_525_60) {
253 			/* NTSC */
254 			em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x09);
255 		} else if (v4l2->norm & V4L2_STD_625_50) {
256 			/* PAL */
257 			em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x07);
258 		}
259 	}
260 
261 	return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, vinctrl);
262 }
263 
264 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
265 				  u8 ymin, u8 ymax)
266 {
267 	em28xx_videodbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
268 			xmin, ymin, xmax, ymax);
269 
270 	em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
271 	em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
272 	em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
273 	return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
274 }
275 
276 static void em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
277 				    u16 width, u16 height)
278 {
279 	u8 cwidth = width >> 2;
280 	u8 cheight = height >> 2;
281 	u8 overflow = (height >> 9 & 0x02) | (width >> 10 & 0x01);
282 	/* NOTE: size limit: 2047x1023 = 2MPix */
283 
284 	em28xx_videodbg("capture area set to (%d,%d): %dx%d\n",
285 			hstart, vstart,
286 		       ((overflow & 2) << 9 | cwidth << 2),
287 		       ((overflow & 1) << 10 | cheight << 2));
288 
289 	em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
290 	em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
291 	em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
292 	em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
293 	em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
294 
295 	/* FIXME: function/meaning of these registers ? */
296 	/* FIXME: align width+height to multiples of 4 ?! */
297 	if (dev->is_em25xx) {
298 		em28xx_write_reg(dev, 0x34, width >> 4);
299 		em28xx_write_reg(dev, 0x35, height >> 4);
300 	}
301 }
302 
303 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
304 {
305 	u8 mode = 0x00;
306 	/* the em2800 scaler only supports scaling down to 50% */
307 
308 	if (dev->board.is_em2800) {
309 		mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
310 	} else {
311 		u8 buf[2];
312 
313 		buf[0] = h;
314 		buf[1] = h >> 8;
315 		em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
316 
317 		buf[0] = v;
318 		buf[1] = v >> 8;
319 		em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
320 		/*
321 		 * it seems that both H and V scalers must be active
322 		 * to work correctly
323 		 */
324 		mode = (h || v) ? 0x30 : 0x00;
325 	}
326 	return em28xx_write_reg(dev, EM28XX_R26_COMPR, mode);
327 }
328 
329 /* FIXME: this only function read values from dev */
330 static int em28xx_resolution_set(struct em28xx *dev)
331 {
332 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
333 	int width = norm_maxw(dev);
334 	int height = norm_maxh(dev);
335 
336 	/* Properly setup VBI */
337 	v4l2->vbi_width = 720;
338 	if (v4l2->norm & V4L2_STD_525_60)
339 		v4l2->vbi_height = 12;
340 	else
341 		v4l2->vbi_height = 18;
342 
343 	em28xx_set_outfmt(dev);
344 
345 	em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
346 
347 	/*
348 	 * If we don't set the start position to 2 in VBI mode, we end up
349 	 * with line 20/21 being YUYV encoded instead of being in 8-bit
350 	 * greyscale.  The core of the issue is that line 21 (and line 23 for
351 	 * PAL WSS) are inside of active video region, and as a result they
352 	 * get the pixelformatting associated with that area.  So by cropping
353 	 * it out, we end up with the same format as the rest of the VBI
354 	 * region
355 	 */
356 	if (em28xx_vbi_supported(dev) == 1)
357 		em28xx_capture_area_set(dev, 0, 2, width, height);
358 	else
359 		em28xx_capture_area_set(dev, 0, 0, width, height);
360 
361 	return em28xx_scaler_set(dev, v4l2->hscale, v4l2->vscale);
362 }
363 
364 /* Set USB alternate setting for analog video */
365 static int em28xx_set_alternate(struct em28xx *dev)
366 {
367 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
368 	struct usb_device *udev = interface_to_usbdev(dev->intf);
369 	int err;
370 	int i;
371 	unsigned int min_pkt_size = v4l2->width * 2 + 4;
372 
373 	/*
374 	 * NOTE: for isoc transfers, only alt settings > 0 are allowed
375 	 * bulk transfers seem to work only with alt=0 !
376 	 */
377 	dev->alt = 0;
378 	if (alt > 0 && alt < dev->num_alt) {
379 		em28xx_videodbg("alternate forced to %d\n", dev->alt);
380 		dev->alt = alt;
381 		goto set_alt;
382 	}
383 	if (dev->analog_xfer_bulk)
384 		goto set_alt;
385 
386 	/*
387 	 * When image size is bigger than a certain value,
388 	 * the frame size should be increased, otherwise, only
389 	 * green screen will be received.
390 	 */
391 	if (v4l2->width * 2 * v4l2->height > 720 * 240 * 2)
392 		min_pkt_size *= 2;
393 
394 	for (i = 0; i < dev->num_alt; i++) {
395 		/* stop when the selected alt setting offers enough bandwidth */
396 		if (dev->alt_max_pkt_size_isoc[i] >= min_pkt_size) {
397 			dev->alt = i;
398 			break;
399 		/*
400 		 * otherwise make sure that we end up with the maximum
401 		 * bandwidth because the min_pkt_size equation might be wrong.
402 		 *
403 		 */
404 		} else if (dev->alt_max_pkt_size_isoc[i] >
405 			   dev->alt_max_pkt_size_isoc[dev->alt])
406 			dev->alt = i;
407 	}
408 
409 set_alt:
410 	/*
411 	 * NOTE: for bulk transfers, we need to call usb_set_interface()
412 	 * even if the previous settings were the same. Otherwise streaming
413 	 * fails with all urbs having status = -EOVERFLOW !
414 	 */
415 	if (dev->analog_xfer_bulk) {
416 		dev->max_pkt_size = 512; /* USB 2.0 spec */
417 		dev->packet_multiplier = EM28XX_BULK_PACKET_MULTIPLIER;
418 	} else { /* isoc */
419 		em28xx_videodbg("minimum isoc packet size: %u (alt=%d)\n",
420 				min_pkt_size, dev->alt);
421 		dev->max_pkt_size =
422 				  dev->alt_max_pkt_size_isoc[dev->alt];
423 		dev->packet_multiplier = EM28XX_NUM_ISOC_PACKETS;
424 	}
425 	em28xx_videodbg("setting alternate %d with wMaxPacketSize=%u\n",
426 			dev->alt, dev->max_pkt_size);
427 	err = usb_set_interface(udev, dev->ifnum, dev->alt);
428 	if (err < 0) {
429 		dev_err(&dev->intf->dev,
430 			"cannot change alternate number to %d (error=%i)\n",
431 			dev->alt, err);
432 		return err;
433 	}
434 	return 0;
435 }
436 
437 /*
438  * DMA and thread functions
439  */
440 
441 /*
442  * Finish the current buffer
443  */
444 static inline void finish_buffer(struct em28xx *dev,
445 				 struct em28xx_buffer *buf)
446 {
447 	em28xx_isocdbg("[%p/%d] wakeup\n", buf, buf->top_field);
448 
449 	buf->vb.sequence = dev->v4l2->field_count++;
450 	if (dev->v4l2->progressive)
451 		buf->vb.field = V4L2_FIELD_NONE;
452 	else
453 		buf->vb.field = V4L2_FIELD_INTERLACED;
454 	buf->vb.vb2_buf.timestamp = ktime_get_ns();
455 
456 	vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
457 }
458 
459 /*
460  * Copy picture data from USB buffer to videobuf buffer
461  */
462 static void em28xx_copy_video(struct em28xx *dev,
463 			      struct em28xx_buffer *buf,
464 			      unsigned char *usb_buf,
465 			      unsigned long len)
466 {
467 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
468 	void *fieldstart, *startwrite, *startread;
469 	int  linesdone, currlinedone, offset, lencopy, remain;
470 	int bytesperline = v4l2->width << 1;
471 
472 	if (buf->pos + len > buf->length)
473 		len = buf->length - buf->pos;
474 
475 	startread = usb_buf;
476 	remain = len;
477 
478 	if (v4l2->progressive || buf->top_field)
479 		fieldstart = buf->vb_buf;
480 	else /* interlaced mode, even nr. of lines */
481 		fieldstart = buf->vb_buf + bytesperline;
482 
483 	linesdone = buf->pos / bytesperline;
484 	currlinedone = buf->pos % bytesperline;
485 
486 	if (v4l2->progressive)
487 		offset = linesdone * bytesperline + currlinedone;
488 	else
489 		offset = linesdone * bytesperline * 2 + currlinedone;
490 
491 	startwrite = fieldstart + offset;
492 	lencopy = bytesperline - currlinedone;
493 	lencopy = lencopy > remain ? remain : lencopy;
494 
495 	if ((char *)startwrite + lencopy > (char *)buf->vb_buf + buf->length) {
496 		em28xx_isocdbg("Overflow of %zu bytes past buffer end (1)\n",
497 			       ((char *)startwrite + lencopy) -
498 			      ((char *)buf->vb_buf + buf->length));
499 		remain = (char *)buf->vb_buf + buf->length -
500 			 (char *)startwrite;
501 		lencopy = remain;
502 	}
503 	if (lencopy <= 0)
504 		return;
505 	memcpy(startwrite, startread, lencopy);
506 
507 	remain -= lencopy;
508 
509 	while (remain > 0) {
510 		if (v4l2->progressive)
511 			startwrite += lencopy;
512 		else
513 			startwrite += lencopy + bytesperline;
514 		startread += lencopy;
515 		if (bytesperline > remain)
516 			lencopy = remain;
517 		else
518 			lencopy = bytesperline;
519 
520 		if ((char *)startwrite + lencopy > (char *)buf->vb_buf +
521 		    buf->length) {
522 			em28xx_isocdbg("Overflow of %zu bytes past buffer end(2)\n",
523 				       ((char *)startwrite + lencopy) -
524 				       ((char *)buf->vb_buf + buf->length));
525 			remain = (char *)buf->vb_buf + buf->length -
526 				 (char *)startwrite;
527 			lencopy = remain;
528 		}
529 		if (lencopy <= 0)
530 			break;
531 
532 		memcpy(startwrite, startread, lencopy);
533 
534 		remain -= lencopy;
535 	}
536 
537 	buf->pos += len;
538 }
539 
540 /*
541  * Copy VBI data from USB buffer to videobuf buffer
542  */
543 static void em28xx_copy_vbi(struct em28xx *dev,
544 			    struct em28xx_buffer *buf,
545 			    unsigned char *usb_buf,
546 			    unsigned long len)
547 {
548 	unsigned int offset;
549 
550 	if (buf->pos + len > buf->length)
551 		len = buf->length - buf->pos;
552 
553 	offset = buf->pos;
554 	/* Make sure the bottom field populates the second half of the frame */
555 	if (buf->top_field == 0)
556 		offset += dev->v4l2->vbi_width * dev->v4l2->vbi_height;
557 
558 	memcpy(buf->vb_buf + offset, usb_buf, len);
559 	buf->pos += len;
560 }
561 
562 static inline void print_err_status(struct em28xx *dev,
563 				    int packet, int status)
564 {
565 	char *errmsg = "Unknown";
566 
567 	switch (status) {
568 	case -ENOENT:
569 		errmsg = "unlinked synchronously";
570 		break;
571 	case -ECONNRESET:
572 		errmsg = "unlinked asynchronously";
573 		break;
574 	case -ENOSR:
575 		errmsg = "Buffer error (overrun)";
576 		break;
577 	case -EPIPE:
578 		errmsg = "Stalled (device not responding)";
579 		break;
580 	case -EOVERFLOW:
581 		errmsg = "Babble (bad cable?)";
582 		break;
583 	case -EPROTO:
584 		errmsg = "Bit-stuff error (bad cable?)";
585 		break;
586 	case -EILSEQ:
587 		errmsg = "CRC/Timeout (could be anything)";
588 		break;
589 	case -ETIME:
590 		errmsg = "Device does not respond";
591 		break;
592 	}
593 	if (packet < 0) {
594 		em28xx_isocdbg("URB status %d [%s].\n",	status, errmsg);
595 	} else {
596 		em28xx_isocdbg("URB packet %d, status %d [%s].\n",
597 			       packet, status, errmsg);
598 	}
599 }
600 
601 /*
602  * get the next available buffer from dma queue
603  */
604 static inline struct em28xx_buffer *get_next_buf(struct em28xx *dev,
605 						 struct em28xx_dmaqueue *dma_q)
606 {
607 	struct em28xx_buffer *buf;
608 
609 	if (list_empty(&dma_q->active)) {
610 		em28xx_isocdbg("No active queue to serve\n");
611 		return NULL;
612 	}
613 
614 	/* Get the next buffer */
615 	buf = list_entry(dma_q->active.next, struct em28xx_buffer, list);
616 	/* Cleans up buffer - Useful for testing for frame/URB loss */
617 	list_del(&buf->list);
618 	buf->pos = 0;
619 	buf->vb_buf = buf->mem;
620 
621 	return buf;
622 }
623 
624 /*
625  * Finish the current buffer if completed and prepare for the next field
626  */
627 static struct em28xx_buffer *
628 finish_field_prepare_next(struct em28xx *dev,
629 			  struct em28xx_buffer *buf,
630 			  struct em28xx_dmaqueue *dma_q)
631 {
632 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
633 
634 	if (v4l2->progressive || v4l2->top_field) { /* Brand new frame */
635 		if (buf)
636 			finish_buffer(dev, buf);
637 		buf = get_next_buf(dev, dma_q);
638 	}
639 	if (buf) {
640 		buf->top_field = v4l2->top_field;
641 		buf->pos = 0;
642 	}
643 
644 	return buf;
645 }
646 
647 /*
648  * Process data packet according to the em2710/em2750/em28xx frame data format
649  */
650 static inline void process_frame_data_em28xx(struct em28xx *dev,
651 					     unsigned char *data_pkt,
652 					     unsigned int  data_len)
653 {
654 	struct em28xx_v4l2      *v4l2 = dev->v4l2;
655 	struct em28xx_buffer    *buf = dev->usb_ctl.vid_buf;
656 	struct em28xx_buffer    *vbi_buf = dev->usb_ctl.vbi_buf;
657 	struct em28xx_dmaqueue  *dma_q = &dev->vidq;
658 	struct em28xx_dmaqueue  *vbi_dma_q = &dev->vbiq;
659 
660 	/*
661 	 * capture type 0 = vbi start
662 	 * capture type 1 = vbi in progress
663 	 * capture type 2 = video start
664 	 * capture type 3 = video in progress
665 	 */
666 	if (data_len >= 4) {
667 		/*
668 		 * NOTE: Headers are always 4 bytes and
669 		 * never split across packets
670 		 */
671 		if (data_pkt[0] == 0x88 && data_pkt[1] == 0x88 &&
672 		    data_pkt[2] == 0x88 && data_pkt[3] == 0x88) {
673 			/* Continuation */
674 			data_pkt += 4;
675 			data_len -= 4;
676 		} else if (data_pkt[0] == 0x33 && data_pkt[1] == 0x95) {
677 			/* Field start (VBI mode) */
678 			v4l2->capture_type = 0;
679 			v4l2->vbi_read = 0;
680 			em28xx_isocdbg("VBI START HEADER !!!\n");
681 			v4l2->top_field = !(data_pkt[2] & 1);
682 			data_pkt += 4;
683 			data_len -= 4;
684 		} else if (data_pkt[0] == 0x22 && data_pkt[1] == 0x5a) {
685 			/* Field start (VBI disabled) */
686 			v4l2->capture_type = 2;
687 			em28xx_isocdbg("VIDEO START HEADER !!!\n");
688 			v4l2->top_field = !(data_pkt[2] & 1);
689 			data_pkt += 4;
690 			data_len -= 4;
691 		}
692 	}
693 	/*
694 	 * NOTE: With bulk transfers, intermediate data packets
695 	 * have no continuation header
696 	 */
697 
698 	if (v4l2->capture_type == 0) {
699 		vbi_buf = finish_field_prepare_next(dev, vbi_buf, vbi_dma_q);
700 		dev->usb_ctl.vbi_buf = vbi_buf;
701 		v4l2->capture_type = 1;
702 	}
703 
704 	if (v4l2->capture_type == 1) {
705 		int vbi_size = v4l2->vbi_width * v4l2->vbi_height;
706 		int vbi_data_len = ((v4l2->vbi_read + data_len) > vbi_size) ?
707 				   (vbi_size - v4l2->vbi_read) : data_len;
708 
709 		/* Copy VBI data */
710 		if (vbi_buf)
711 			em28xx_copy_vbi(dev, vbi_buf, data_pkt, vbi_data_len);
712 		v4l2->vbi_read += vbi_data_len;
713 
714 		if (vbi_data_len < data_len) {
715 			/* Continue with copying video data */
716 			v4l2->capture_type = 2;
717 			data_pkt += vbi_data_len;
718 			data_len -= vbi_data_len;
719 		}
720 	}
721 
722 	if (v4l2->capture_type == 2) {
723 		buf = finish_field_prepare_next(dev, buf, dma_q);
724 		dev->usb_ctl.vid_buf = buf;
725 		v4l2->capture_type = 3;
726 	}
727 
728 	if (v4l2->capture_type == 3 && buf && data_len > 0)
729 		em28xx_copy_video(dev, buf, data_pkt, data_len);
730 }
731 
732 /*
733  * Process data packet according to the em25xx/em276x/7x/8x frame data format
734  */
735 static inline void process_frame_data_em25xx(struct em28xx *dev,
736 					     unsigned char *data_pkt,
737 					     unsigned int  data_len)
738 {
739 	struct em28xx_buffer    *buf = dev->usb_ctl.vid_buf;
740 	struct em28xx_dmaqueue  *dmaq = &dev->vidq;
741 	struct em28xx_v4l2      *v4l2 = dev->v4l2;
742 	bool frame_end = false;
743 
744 	/* Check for header */
745 	/*
746 	 * NOTE: at least with bulk transfers, only the first packet
747 	 * has a header and has always set the FRAME_END bit
748 	 */
749 	if (data_len >= 2) {	/* em25xx header is only 2 bytes long */
750 		if ((data_pkt[0] == EM25XX_FRMDATAHDR_BYTE1) &&
751 		    ((data_pkt[1] & ~EM25XX_FRMDATAHDR_BYTE2_MASK) == 0x00)) {
752 			v4l2->top_field = !(data_pkt[1] &
753 					   EM25XX_FRMDATAHDR_BYTE2_FRAME_ID);
754 			frame_end = data_pkt[1] &
755 				    EM25XX_FRMDATAHDR_BYTE2_FRAME_END;
756 			data_pkt += 2;
757 			data_len -= 2;
758 		}
759 
760 		/* Finish field and prepare next (BULK only) */
761 		if (dev->analog_xfer_bulk && frame_end) {
762 			buf = finish_field_prepare_next(dev, buf, dmaq);
763 			dev->usb_ctl.vid_buf = buf;
764 		}
765 		/*
766 		 * NOTE: in ISOC mode when a new frame starts and buf==NULL,
767 		 * we COULD already prepare a buffer here to avoid skipping the
768 		 * first frame.
769 		 */
770 	}
771 
772 	/* Copy data */
773 	if (buf && data_len > 0)
774 		em28xx_copy_video(dev, buf, data_pkt, data_len);
775 
776 	/* Finish frame (ISOC only) => avoids lag of 1 frame */
777 	if (!dev->analog_xfer_bulk && frame_end) {
778 		buf = finish_field_prepare_next(dev, buf, dmaq);
779 		dev->usb_ctl.vid_buf = buf;
780 	}
781 
782 	/*
783 	 * NOTES:
784 	 *
785 	 * 1) Tested with USB bulk transfers only !
786 	 * The wording in the datasheet suggests that isoc might work different.
787 	 * The current code assumes that with isoc transfers each packet has a
788 	 * header like with the other em28xx devices.
789 	 *
790 	 * 2) Support for interlaced mode is pure theory. It has not been
791 	 * tested and it is unknown if these devices actually support it.
792 	 */
793 }
794 
795 /* Processes and copies the URB data content (video and VBI data) */
796 static inline int em28xx_urb_data_copy(struct em28xx *dev, struct urb *urb)
797 {
798 	int xfer_bulk, num_packets, i;
799 	unsigned char *usb_data_pkt;
800 	unsigned int usb_data_len;
801 
802 	if (!dev)
803 		return 0;
804 
805 	if (dev->disconnected)
806 		return 0;
807 
808 	if (urb->status < 0)
809 		print_err_status(dev, -1, urb->status);
810 
811 	xfer_bulk = usb_pipebulk(urb->pipe);
812 
813 	if (xfer_bulk) /* bulk */
814 		num_packets = 1;
815 	else /* isoc */
816 		num_packets = urb->number_of_packets;
817 
818 	for (i = 0; i < num_packets; i++) {
819 		if (xfer_bulk) { /* bulk */
820 			usb_data_len = urb->actual_length;
821 
822 			usb_data_pkt = urb->transfer_buffer;
823 		} else { /* isoc */
824 			if (urb->iso_frame_desc[i].status < 0) {
825 				print_err_status(dev, i,
826 						 urb->iso_frame_desc[i].status);
827 				if (urb->iso_frame_desc[i].status != -EPROTO)
828 					continue;
829 			}
830 
831 			usb_data_len = urb->iso_frame_desc[i].actual_length;
832 			if (usb_data_len > dev->max_pkt_size) {
833 				em28xx_isocdbg("packet bigger than packet size");
834 				continue;
835 			}
836 
837 			usb_data_pkt = urb->transfer_buffer +
838 				       urb->iso_frame_desc[i].offset;
839 		}
840 
841 		if (usb_data_len == 0) {
842 			/* NOTE: happens very often with isoc transfers */
843 			/* em28xx_usbdbg("packet %d is empty",i); - spammy */
844 			continue;
845 		}
846 
847 		if (dev->is_em25xx)
848 			process_frame_data_em25xx(dev,
849 						  usb_data_pkt, usb_data_len);
850 		else
851 			process_frame_data_em28xx(dev,
852 						  usb_data_pkt, usb_data_len);
853 	}
854 	return 1;
855 }
856 
857 static int get_resource(enum v4l2_buf_type f_type)
858 {
859 	switch (f_type) {
860 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
861 		return EM28XX_RESOURCE_VIDEO;
862 	case V4L2_BUF_TYPE_VBI_CAPTURE:
863 		return EM28XX_RESOURCE_VBI;
864 	default:
865 		WARN_ON(1);
866 		return -1; /* Indicate that device is busy */
867 	}
868 }
869 
870 /* Usage lock check functions */
871 static int res_get(struct em28xx *dev, enum v4l2_buf_type f_type)
872 {
873 	int res_type = get_resource(f_type);
874 
875 	/* is it free? */
876 	if (dev->resources & res_type) {
877 		/* no, someone else uses it */
878 		return -EBUSY;
879 	}
880 
881 	/* it's free, grab it */
882 	dev->resources |= res_type;
883 	em28xx_videodbg("res: get %d\n", res_type);
884 	return 0;
885 }
886 
887 static void res_free(struct em28xx *dev, enum v4l2_buf_type f_type)
888 {
889 	int res_type = get_resource(f_type);
890 
891 	dev->resources &= ~res_type;
892 	em28xx_videodbg("res: put %d\n", res_type);
893 }
894 
895 static void em28xx_v4l2_media_release(struct em28xx *dev)
896 {
897 #ifdef CONFIG_MEDIA_CONTROLLER
898 	int i;
899 
900 	for (i = 0; i < MAX_EM28XX_INPUT; i++) {
901 		if (!INPUT(i)->type)
902 			return;
903 		media_device_unregister_entity(&dev->input_ent[i]);
904 	}
905 #endif
906 }
907 
908 /*
909  * Media Controller helper functions
910  */
911 
912 static int em28xx_enable_analog_tuner(struct em28xx *dev)
913 {
914 #ifdef CONFIG_MEDIA_CONTROLLER
915 	struct media_device *mdev = dev->media_dev;
916 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
917 	struct media_entity *source;
918 	struct media_link *link, *found_link = NULL;
919 	int ret, active_links = 0;
920 
921 	if (!mdev || !v4l2->decoder)
922 		return 0;
923 
924 	/*
925 	 * This will find the tuner that is connected into the decoder.
926 	 * Technically, this is not 100% correct, as the device may be
927 	 * using an analog input instead of the tuner. However, as we can't
928 	 * do DVB streaming while the DMA engine is being used for V4L2,
929 	 * this should be enough for the actual needs.
930 	 */
931 	list_for_each_entry(link, &v4l2->decoder->links, list) {
932 		if (link->sink->entity == v4l2->decoder) {
933 			found_link = link;
934 			if (link->flags & MEDIA_LNK_FL_ENABLED)
935 				active_links++;
936 			break;
937 		}
938 	}
939 
940 	if (active_links == 1 || !found_link)
941 		return 0;
942 
943 	source = found_link->source->entity;
944 	list_for_each_entry(link, &source->links, list) {
945 		struct media_entity *sink;
946 		int flags = 0;
947 
948 		sink = link->sink->entity;
949 
950 		if (sink == v4l2->decoder)
951 			flags = MEDIA_LNK_FL_ENABLED;
952 
953 		ret = media_entity_setup_link(link, flags);
954 		if (ret) {
955 			dev_err(&dev->intf->dev,
956 				"Couldn't change link %s->%s to %s. Error %d\n",
957 				source->name, sink->name,
958 				flags ? "enabled" : "disabled",
959 				ret);
960 			return ret;
961 		}
962 
963 		em28xx_videodbg("link %s->%s was %s\n",
964 				source->name, sink->name,
965 				flags ? "ENABLED" : "disabled");
966 	}
967 #endif
968 	return 0;
969 }
970 
971 static const char * const iname[] = {
972 	[EM28XX_VMUX_COMPOSITE]  = "Composite",
973 	[EM28XX_VMUX_SVIDEO]     = "S-Video",
974 	[EM28XX_VMUX_TELEVISION] = "Television",
975 	[EM28XX_RADIO]           = "Radio",
976 };
977 
978 static void em28xx_v4l2_create_entities(struct em28xx *dev)
979 {
980 #if defined(CONFIG_MEDIA_CONTROLLER)
981 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
982 	int ret, i;
983 
984 	/* Initialize Video, VBI and Radio pads */
985 	v4l2->video_pad.flags = MEDIA_PAD_FL_SINK;
986 	ret = media_entity_pads_init(&v4l2->vdev.entity, 1, &v4l2->video_pad);
987 	if (ret < 0)
988 		dev_err(&dev->intf->dev,
989 			"failed to initialize video media entity!\n");
990 
991 	if (em28xx_vbi_supported(dev)) {
992 		v4l2->vbi_pad.flags = MEDIA_PAD_FL_SINK;
993 		ret = media_entity_pads_init(&v4l2->vbi_dev.entity, 1,
994 					     &v4l2->vbi_pad);
995 		if (ret < 0)
996 			dev_err(&dev->intf->dev,
997 				"failed to initialize vbi media entity!\n");
998 	}
999 
1000 	/* Webcams don't have input connectors */
1001 	if (dev->is_webcam)
1002 		return;
1003 
1004 	/* Create entities for each input connector */
1005 	for (i = 0; i < MAX_EM28XX_INPUT; i++) {
1006 		struct media_entity *ent = &dev->input_ent[i];
1007 
1008 		if (!INPUT(i)->type)
1009 			break;
1010 
1011 		ent->name = iname[INPUT(i)->type];
1012 		ent->flags = MEDIA_ENT_FL_CONNECTOR;
1013 		dev->input_pad[i].flags = MEDIA_PAD_FL_SOURCE;
1014 
1015 		switch (INPUT(i)->type) {
1016 		case EM28XX_VMUX_COMPOSITE:
1017 			ent->function = MEDIA_ENT_F_CONN_COMPOSITE;
1018 			break;
1019 		case EM28XX_VMUX_SVIDEO:
1020 			ent->function = MEDIA_ENT_F_CONN_SVIDEO;
1021 			break;
1022 		default: /* EM28XX_VMUX_TELEVISION or EM28XX_RADIO */
1023 			if (dev->tuner_type != TUNER_ABSENT)
1024 				ent->function = MEDIA_ENT_F_CONN_RF;
1025 			break;
1026 		}
1027 
1028 		ret = media_entity_pads_init(ent, 1, &dev->input_pad[i]);
1029 		if (ret < 0)
1030 			dev_err(&dev->intf->dev,
1031 				"failed to initialize input pad[%d]!\n", i);
1032 
1033 		ret = media_device_register_entity(dev->media_dev, ent);
1034 		if (ret < 0)
1035 			dev_err(&dev->intf->dev,
1036 				"failed to register input entity %d!\n", i);
1037 	}
1038 #endif
1039 }
1040 
1041 /*
1042  * Videobuf2 operations
1043  */
1044 
1045 static int queue_setup(struct vb2_queue *vq,
1046 		       unsigned int *nbuffers, unsigned int *nplanes,
1047 		       unsigned int sizes[], struct device *alloc_devs[])
1048 {
1049 	struct em28xx *dev = vb2_get_drv_priv(vq);
1050 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
1051 	unsigned long size =
1052 		    (v4l2->width * v4l2->height * v4l2->format->depth + 7) >> 3;
1053 
1054 	if (*nplanes)
1055 		return sizes[0] < size ? -EINVAL : 0;
1056 	*nplanes = 1;
1057 	sizes[0] = size;
1058 
1059 	em28xx_enable_analog_tuner(dev);
1060 
1061 	return 0;
1062 }
1063 
1064 static int
1065 buffer_prepare(struct vb2_buffer *vb)
1066 {
1067 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
1068 	struct em28xx        *dev = vb2_get_drv_priv(vb->vb2_queue);
1069 	struct em28xx_v4l2   *v4l2 = dev->v4l2;
1070 	unsigned long size;
1071 
1072 	em28xx_videodbg("%s, field=%d\n", __func__, vbuf->field);
1073 
1074 	size = (v4l2->width * v4l2->height * v4l2->format->depth + 7) >> 3;
1075 
1076 	if (vb2_plane_size(vb, 0) < size) {
1077 		em28xx_videodbg("%s data will not fit into plane (%lu < %lu)\n",
1078 				__func__, vb2_plane_size(vb, 0), size);
1079 		return -EINVAL;
1080 	}
1081 	vb2_set_plane_payload(vb, 0, size);
1082 
1083 	return 0;
1084 }
1085 
1086 int em28xx_start_analog_streaming(struct vb2_queue *vq, unsigned int count)
1087 {
1088 	struct em28xx *dev = vb2_get_drv_priv(vq);
1089 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
1090 	struct v4l2_frequency f;
1091 	struct v4l2_fh *owner;
1092 	int rc = 0;
1093 
1094 	em28xx_videodbg("%s\n", __func__);
1095 
1096 	dev->v4l2->field_count = 0;
1097 
1098 	/*
1099 	 * Make sure streaming is not already in progress for this type
1100 	 * of filehandle (e.g. video, vbi)
1101 	 */
1102 	rc = res_get(dev, vq->type);
1103 	if (rc)
1104 		return rc;
1105 
1106 	if (v4l2->streaming_users == 0) {
1107 		/* First active streaming user, so allocate all the URBs */
1108 
1109 		/* Allocate the USB bandwidth */
1110 		em28xx_set_alternate(dev);
1111 
1112 		/*
1113 		 * Needed, since GPIO might have disabled power of
1114 		 * some i2c device
1115 		 */
1116 		em28xx_wake_i2c(dev);
1117 
1118 		v4l2->capture_type = -1;
1119 		rc = em28xx_init_usb_xfer(dev, EM28XX_ANALOG_MODE,
1120 					  dev->analog_xfer_bulk,
1121 					  EM28XX_NUM_BUFS,
1122 					  dev->max_pkt_size,
1123 					  dev->packet_multiplier,
1124 					  em28xx_urb_data_copy);
1125 		if (rc < 0)
1126 			return rc;
1127 
1128 		/*
1129 		 * djh: it's not clear whether this code is still needed.  I'm
1130 		 * leaving it in here for now entirely out of concern for
1131 		 * backward compatibility (the old code did it)
1132 		 */
1133 
1134 		/* Ask tuner to go to analog or radio mode */
1135 		memset(&f, 0, sizeof(f));
1136 		f.frequency = v4l2->frequency;
1137 		owner = (struct v4l2_fh *)vq->owner;
1138 		if (owner && owner->vdev->vfl_type == VFL_TYPE_RADIO)
1139 			f.type = V4L2_TUNER_RADIO;
1140 		else
1141 			f.type = V4L2_TUNER_ANALOG_TV;
1142 		v4l2_device_call_all(&v4l2->v4l2_dev,
1143 				     0, tuner, s_frequency, &f);
1144 
1145 		/* Enable video stream at TV decoder */
1146 		v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 1);
1147 	}
1148 
1149 	v4l2->streaming_users++;
1150 
1151 	return rc;
1152 }
1153 
1154 static void em28xx_stop_streaming(struct vb2_queue *vq)
1155 {
1156 	struct em28xx *dev = vb2_get_drv_priv(vq);
1157 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
1158 	struct em28xx_dmaqueue *vidq = &dev->vidq;
1159 	unsigned long flags = 0;
1160 
1161 	em28xx_videodbg("%s\n", __func__);
1162 
1163 	res_free(dev, vq->type);
1164 
1165 	if (v4l2->streaming_users-- == 1) {
1166 		/* Disable video stream at TV decoder */
1167 		v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 0);
1168 
1169 		/* Last active user, so shutdown all the URBS */
1170 		em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
1171 	}
1172 
1173 	spin_lock_irqsave(&dev->slock, flags);
1174 	if (dev->usb_ctl.vid_buf) {
1175 		vb2_buffer_done(&dev->usb_ctl.vid_buf->vb.vb2_buf,
1176 				VB2_BUF_STATE_ERROR);
1177 		dev->usb_ctl.vid_buf = NULL;
1178 	}
1179 	while (!list_empty(&vidq->active)) {
1180 		struct em28xx_buffer *buf;
1181 
1182 		buf = list_entry(vidq->active.next, struct em28xx_buffer, list);
1183 		list_del(&buf->list);
1184 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
1185 	}
1186 	spin_unlock_irqrestore(&dev->slock, flags);
1187 }
1188 
1189 void em28xx_stop_vbi_streaming(struct vb2_queue *vq)
1190 {
1191 	struct em28xx *dev = vb2_get_drv_priv(vq);
1192 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
1193 	struct em28xx_dmaqueue *vbiq = &dev->vbiq;
1194 	unsigned long flags = 0;
1195 
1196 	em28xx_videodbg("%s\n", __func__);
1197 
1198 	res_free(dev, vq->type);
1199 
1200 	if (v4l2->streaming_users-- == 1) {
1201 		/* Disable video stream at TV decoder */
1202 		v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 0);
1203 
1204 		/* Last active user, so shutdown all the URBS */
1205 		em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
1206 	}
1207 
1208 	spin_lock_irqsave(&dev->slock, flags);
1209 	if (dev->usb_ctl.vbi_buf) {
1210 		vb2_buffer_done(&dev->usb_ctl.vbi_buf->vb.vb2_buf,
1211 				VB2_BUF_STATE_ERROR);
1212 		dev->usb_ctl.vbi_buf = NULL;
1213 	}
1214 	while (!list_empty(&vbiq->active)) {
1215 		struct em28xx_buffer *buf;
1216 
1217 		buf = list_entry(vbiq->active.next, struct em28xx_buffer, list);
1218 		list_del(&buf->list);
1219 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
1220 	}
1221 	spin_unlock_irqrestore(&dev->slock, flags);
1222 }
1223 
1224 static void
1225 buffer_queue(struct vb2_buffer *vb)
1226 {
1227 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
1228 	struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
1229 	struct em28xx_buffer *buf =
1230 		container_of(vbuf, struct em28xx_buffer, vb);
1231 	struct em28xx_dmaqueue *vidq = &dev->vidq;
1232 	unsigned long flags = 0;
1233 
1234 	em28xx_videodbg("%s\n", __func__);
1235 	buf->mem = vb2_plane_vaddr(vb, 0);
1236 	buf->length = vb2_plane_size(vb, 0);
1237 
1238 	spin_lock_irqsave(&dev->slock, flags);
1239 	list_add_tail(&buf->list, &vidq->active);
1240 	spin_unlock_irqrestore(&dev->slock, flags);
1241 }
1242 
1243 static const struct vb2_ops em28xx_video_qops = {
1244 	.queue_setup    = queue_setup,
1245 	.buf_prepare    = buffer_prepare,
1246 	.buf_queue      = buffer_queue,
1247 	.start_streaming = em28xx_start_analog_streaming,
1248 	.stop_streaming = em28xx_stop_streaming,
1249 	.wait_prepare   = vb2_ops_wait_prepare,
1250 	.wait_finish    = vb2_ops_wait_finish,
1251 };
1252 
1253 static int em28xx_vb2_setup(struct em28xx *dev)
1254 {
1255 	int rc;
1256 	struct vb2_queue *q;
1257 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
1258 
1259 	/* Setup Videobuf2 for Video capture */
1260 	q = &v4l2->vb_vidq;
1261 	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1262 	q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
1263 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1264 	q->drv_priv = dev;
1265 	q->buf_struct_size = sizeof(struct em28xx_buffer);
1266 	q->ops = &em28xx_video_qops;
1267 	q->mem_ops = &vb2_vmalloc_memops;
1268 
1269 	rc = vb2_queue_init(q);
1270 	if (rc < 0)
1271 		return rc;
1272 
1273 	/* Setup Videobuf2 for VBI capture */
1274 	q = &v4l2->vb_vbiq;
1275 	q->type = V4L2_BUF_TYPE_VBI_CAPTURE;
1276 	q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR;
1277 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1278 	q->drv_priv = dev;
1279 	q->buf_struct_size = sizeof(struct em28xx_buffer);
1280 	q->ops = &em28xx_vbi_qops;
1281 	q->mem_ops = &vb2_vmalloc_memops;
1282 
1283 	rc = vb2_queue_init(q);
1284 	if (rc < 0)
1285 		return rc;
1286 
1287 	return 0;
1288 }
1289 
1290 /*
1291  * v4l2 interface
1292  */
1293 
1294 static void video_mux(struct em28xx *dev, int index)
1295 {
1296 	struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;
1297 
1298 	dev->ctl_input = index;
1299 	dev->ctl_ainput = INPUT(index)->amux;
1300 	dev->ctl_aoutput = INPUT(index)->aout;
1301 
1302 	if (!dev->ctl_aoutput)
1303 		dev->ctl_aoutput = EM28XX_AOUT_MASTER;
1304 
1305 	v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
1306 			     INPUT(index)->vmux, 0, 0);
1307 
1308 	if (dev->has_msp34xx) {
1309 		if (dev->i2s_speed) {
1310 			v4l2_device_call_all(v4l2_dev, 0, audio,
1311 					     s_i2s_clock_freq, dev->i2s_speed);
1312 		}
1313 		/* Note: this is msp3400 specific */
1314 		v4l2_device_call_all(v4l2_dev, 0, audio, s_routing,
1315 				     dev->ctl_ainput,
1316 				     MSP_OUTPUT(MSP_SC_IN_DSP_SCART1), 0);
1317 	}
1318 
1319 	if (dev->board.adecoder != EM28XX_NOADECODER) {
1320 		v4l2_device_call_all(v4l2_dev, 0, audio, s_routing,
1321 				     dev->ctl_ainput, dev->ctl_aoutput, 0);
1322 	}
1323 
1324 	em28xx_audio_analog_set(dev);
1325 }
1326 
1327 static void em28xx_ctrl_notify(struct v4l2_ctrl *ctrl, void *priv)
1328 {
1329 	struct em28xx *dev = priv;
1330 
1331 	/*
1332 	 * In the case of non-AC97 volume controls, we still need
1333 	 * to do some setups at em28xx, in order to mute/unmute
1334 	 * and to adjust audio volume. However, the value ranges
1335 	 * should be checked by the corresponding V4L subdriver.
1336 	 */
1337 	switch (ctrl->id) {
1338 	case V4L2_CID_AUDIO_MUTE:
1339 		dev->mute = ctrl->val;
1340 		em28xx_audio_analog_set(dev);
1341 		break;
1342 	case V4L2_CID_AUDIO_VOLUME:
1343 		dev->volume = ctrl->val;
1344 		em28xx_audio_analog_set(dev);
1345 		break;
1346 	}
1347 }
1348 
1349 static int em28xx_s_ctrl(struct v4l2_ctrl *ctrl)
1350 {
1351 	struct em28xx_v4l2 *v4l2 =
1352 		  container_of(ctrl->handler, struct em28xx_v4l2, ctrl_handler);
1353 	struct em28xx *dev = v4l2->dev;
1354 	int ret = -EINVAL;
1355 
1356 	switch (ctrl->id) {
1357 	case V4L2_CID_AUDIO_MUTE:
1358 		dev->mute = ctrl->val;
1359 		ret = em28xx_audio_analog_set(dev);
1360 		break;
1361 	case V4L2_CID_AUDIO_VOLUME:
1362 		dev->volume = ctrl->val;
1363 		ret = em28xx_audio_analog_set(dev);
1364 		break;
1365 	case V4L2_CID_CONTRAST:
1366 		ret = em28xx_write_reg(dev, EM28XX_R20_YGAIN, ctrl->val);
1367 		break;
1368 	case V4L2_CID_BRIGHTNESS:
1369 		ret = em28xx_write_reg(dev, EM28XX_R21_YOFFSET, ctrl->val);
1370 		break;
1371 	case V4L2_CID_SATURATION:
1372 		ret = em28xx_write_reg(dev, EM28XX_R22_UVGAIN, ctrl->val);
1373 		break;
1374 	case V4L2_CID_BLUE_BALANCE:
1375 		ret = em28xx_write_reg(dev, EM28XX_R23_UOFFSET, ctrl->val);
1376 		break;
1377 	case V4L2_CID_RED_BALANCE:
1378 		ret = em28xx_write_reg(dev, EM28XX_R24_VOFFSET, ctrl->val);
1379 		break;
1380 	case V4L2_CID_SHARPNESS:
1381 		ret = em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, ctrl->val);
1382 		break;
1383 	}
1384 
1385 	return (ret < 0) ? ret : 0;
1386 }
1387 
1388 static const struct v4l2_ctrl_ops em28xx_ctrl_ops = {
1389 	.s_ctrl = em28xx_s_ctrl,
1390 };
1391 
1392 static void size_to_scale(struct em28xx *dev,
1393 			  unsigned int width, unsigned int height,
1394 			unsigned int *hscale, unsigned int *vscale)
1395 {
1396 	unsigned int          maxw = norm_maxw(dev);
1397 	unsigned int          maxh = norm_maxh(dev);
1398 
1399 	*hscale = (((unsigned long)maxw) << 12) / width - 4096L;
1400 	if (*hscale > EM28XX_HVSCALE_MAX)
1401 		*hscale = EM28XX_HVSCALE_MAX;
1402 
1403 	*vscale = (((unsigned long)maxh) << 12) / height - 4096L;
1404 	if (*vscale > EM28XX_HVSCALE_MAX)
1405 		*vscale = EM28XX_HVSCALE_MAX;
1406 }
1407 
1408 static void scale_to_size(struct em28xx *dev,
1409 			  unsigned int hscale, unsigned int vscale,
1410 			  unsigned int *width, unsigned int *height)
1411 {
1412 	unsigned int          maxw = norm_maxw(dev);
1413 	unsigned int          maxh = norm_maxh(dev);
1414 
1415 	*width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
1416 	*height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
1417 
1418 	/* Don't let width or height to be zero */
1419 	if (*width < 1)
1420 		*width = 1;
1421 	if (*height < 1)
1422 		*height = 1;
1423 }
1424 
1425 /*
1426  * IOCTL vidioc handling
1427  */
1428 
1429 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1430 				struct v4l2_format *f)
1431 {
1432 	struct em28xx         *dev = video_drvdata(file);
1433 	struct em28xx_v4l2    *v4l2 = dev->v4l2;
1434 
1435 	f->fmt.pix.width = v4l2->width;
1436 	f->fmt.pix.height = v4l2->height;
1437 	f->fmt.pix.pixelformat = v4l2->format->fourcc;
1438 	f->fmt.pix.bytesperline = (v4l2->width * v4l2->format->depth + 7) >> 3;
1439 	f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * v4l2->height;
1440 	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
1441 
1442 	/* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
1443 	if (v4l2->progressive)
1444 		f->fmt.pix.field = V4L2_FIELD_NONE;
1445 	else
1446 		f->fmt.pix.field = v4l2->interlaced_fieldmode ?
1447 			   V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
1448 	return 0;
1449 }
1450 
1451 static struct em28xx_fmt *format_by_fourcc(unsigned int fourcc)
1452 {
1453 	unsigned int i;
1454 
1455 	for (i = 0; i < ARRAY_SIZE(format); i++)
1456 		if (format[i].fourcc == fourcc)
1457 			return &format[i];
1458 
1459 	return NULL;
1460 }
1461 
1462 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
1463 				  struct v4l2_format *f)
1464 {
1465 	struct em28xx         *dev   = video_drvdata(file);
1466 	struct em28xx_v4l2    *v4l2  = dev->v4l2;
1467 	unsigned int          width  = f->fmt.pix.width;
1468 	unsigned int          height = f->fmt.pix.height;
1469 	unsigned int          maxw   = norm_maxw(dev);
1470 	unsigned int          maxh   = norm_maxh(dev);
1471 	unsigned int          hscale, vscale;
1472 	struct em28xx_fmt     *fmt;
1473 
1474 	fmt = format_by_fourcc(f->fmt.pix.pixelformat);
1475 	if (!fmt) {
1476 		fmt = &format[0];
1477 		em28xx_videodbg("Fourcc format (%08x) invalid. Using default (%08x).\n",
1478 				f->fmt.pix.pixelformat, fmt->fourcc);
1479 	}
1480 
1481 	if (dev->board.is_em2800) {
1482 		/* the em2800 can only scale down to 50% */
1483 		height = height > (3 * maxh / 4) ? maxh : maxh / 2;
1484 		width = width > (3 * maxw / 4) ? maxw : maxw / 2;
1485 		/*
1486 		 * MaxPacketSize for em2800 is too small to capture at full
1487 		 * resolution use half of maxw as the scaler can only scale
1488 		 * to 50%
1489 		 */
1490 		if (width == maxw && height == maxh)
1491 			width /= 2;
1492 	} else {
1493 		/*
1494 		 * width must even because of the YUYV format
1495 		 * height must be even because of interlacing
1496 		 */
1497 		v4l_bound_align_image(&width, 48, maxw, 1, &height, 32, maxh,
1498 				      1, 0);
1499 	}
1500 	/* Avoid division by zero at size_to_scale */
1501 	if (width < 1)
1502 		width = 1;
1503 	if (height < 1)
1504 		height = 1;
1505 
1506 	size_to_scale(dev, width, height, &hscale, &vscale);
1507 	scale_to_size(dev, hscale, vscale, &width, &height);
1508 
1509 	f->fmt.pix.width = width;
1510 	f->fmt.pix.height = height;
1511 	f->fmt.pix.pixelformat = fmt->fourcc;
1512 	f->fmt.pix.bytesperline = (width * fmt->depth + 7) >> 3;
1513 	f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * height;
1514 	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
1515 	if (v4l2->progressive)
1516 		f->fmt.pix.field = V4L2_FIELD_NONE;
1517 	else
1518 		f->fmt.pix.field = v4l2->interlaced_fieldmode ?
1519 			   V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
1520 	f->fmt.pix.priv = 0;
1521 
1522 	return 0;
1523 }
1524 
1525 static int em28xx_set_video_format(struct em28xx *dev, unsigned int fourcc,
1526 				   unsigned int width, unsigned int height)
1527 {
1528 	struct em28xx_fmt     *fmt;
1529 	struct em28xx_v4l2    *v4l2 = dev->v4l2;
1530 
1531 	fmt = format_by_fourcc(fourcc);
1532 	if (!fmt)
1533 		return -EINVAL;
1534 
1535 	v4l2->format = fmt;
1536 	v4l2->width  = width;
1537 	v4l2->height = height;
1538 
1539 	/* set new image size */
1540 	size_to_scale(dev, v4l2->width, v4l2->height,
1541 		      &v4l2->hscale, &v4l2->vscale);
1542 
1543 	em28xx_resolution_set(dev);
1544 
1545 	return 0;
1546 }
1547 
1548 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1549 				struct v4l2_format *f)
1550 {
1551 	struct em28xx *dev = video_drvdata(file);
1552 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
1553 
1554 	if (vb2_is_busy(&v4l2->vb_vidq))
1555 		return -EBUSY;
1556 
1557 	vidioc_try_fmt_vid_cap(file, priv, f);
1558 
1559 	return em28xx_set_video_format(dev, f->fmt.pix.pixelformat,
1560 				f->fmt.pix.width, f->fmt.pix.height);
1561 }
1562 
1563 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
1564 {
1565 	struct em28xx *dev = video_drvdata(file);
1566 
1567 	*norm = dev->v4l2->norm;
1568 
1569 	return 0;
1570 }
1571 
1572 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
1573 {
1574 	struct em28xx *dev = video_drvdata(file);
1575 
1576 	v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, video, querystd, norm);
1577 
1578 	return 0;
1579 }
1580 
1581 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
1582 {
1583 	struct em28xx      *dev  = video_drvdata(file);
1584 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
1585 	struct v4l2_format f;
1586 
1587 	if (norm == v4l2->norm)
1588 		return 0;
1589 
1590 	if (v4l2->streaming_users > 0)
1591 		return -EBUSY;
1592 
1593 	v4l2->norm = norm;
1594 
1595 	/* Adjusts width/height, if needed */
1596 	f.fmt.pix.width = 720;
1597 	f.fmt.pix.height = (norm & V4L2_STD_525_60) ? 480 : 576;
1598 	vidioc_try_fmt_vid_cap(file, priv, &f);
1599 
1600 	/* set new image size */
1601 	v4l2->width = f.fmt.pix.width;
1602 	v4l2->height = f.fmt.pix.height;
1603 	size_to_scale(dev, v4l2->width, v4l2->height,
1604 		      &v4l2->hscale, &v4l2->vscale);
1605 
1606 	em28xx_resolution_set(dev);
1607 	v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
1608 
1609 	return 0;
1610 }
1611 
1612 static int vidioc_g_parm(struct file *file, void *priv,
1613 			 struct v4l2_streamparm *p)
1614 {
1615 	struct v4l2_subdev_frame_interval ival = { 0 };
1616 	struct em28xx      *dev  = video_drvdata(file);
1617 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
1618 	int rc = 0;
1619 
1620 	if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
1621 	    p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
1622 		return -EINVAL;
1623 
1624 	p->parm.capture.readbuffers = EM28XX_MIN_BUF;
1625 	p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1626 	if (dev->is_webcam) {
1627 		rc = v4l2_device_call_until_err(&v4l2->v4l2_dev, 0,
1628 						video, g_frame_interval, &ival);
1629 		if (!rc)
1630 			p->parm.capture.timeperframe = ival.interval;
1631 	} else {
1632 		v4l2_video_std_frame_period(v4l2->norm,
1633 					    &p->parm.capture.timeperframe);
1634 	}
1635 
1636 	return rc;
1637 }
1638 
1639 static int vidioc_s_parm(struct file *file, void *priv,
1640 			 struct v4l2_streamparm *p)
1641 {
1642 	struct em28xx *dev = video_drvdata(file);
1643 	struct v4l2_subdev_frame_interval ival = {
1644 		0,
1645 		p->parm.capture.timeperframe
1646 	};
1647 	int rc = 0;
1648 
1649 	if (!dev->is_webcam)
1650 		return -ENOTTY;
1651 
1652 	if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
1653 	    p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
1654 		return -EINVAL;
1655 
1656 	memset(&p->parm, 0, sizeof(p->parm));
1657 	p->parm.capture.readbuffers = EM28XX_MIN_BUF;
1658 	p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1659 	rc = v4l2_device_call_until_err(&dev->v4l2->v4l2_dev, 0,
1660 					video, s_frame_interval, &ival);
1661 	if (!rc)
1662 		p->parm.capture.timeperframe = ival.interval;
1663 	return rc;
1664 }
1665 
1666 static int vidioc_enum_input(struct file *file, void *priv,
1667 			     struct v4l2_input *i)
1668 {
1669 	struct em28xx *dev = video_drvdata(file);
1670 	unsigned int       n;
1671 	int j;
1672 
1673 	n = i->index;
1674 	if (n >= MAX_EM28XX_INPUT)
1675 		return -EINVAL;
1676 	if (!INPUT(n)->type)
1677 		return -EINVAL;
1678 
1679 	i->type = V4L2_INPUT_TYPE_CAMERA;
1680 
1681 	strscpy(i->name, iname[INPUT(n)->type], sizeof(i->name));
1682 
1683 	if (INPUT(n)->type == EM28XX_VMUX_TELEVISION)
1684 		i->type = V4L2_INPUT_TYPE_TUNER;
1685 
1686 	i->std = dev->v4l2->vdev.tvnorms;
1687 	/* webcams do not have the STD API */
1688 	if (dev->is_webcam)
1689 		i->capabilities = 0;
1690 
1691 	/* Dynamically generates an audioset bitmask */
1692 	i->audioset = 0;
1693 	for (j = 0; j < MAX_EM28XX_INPUT; j++)
1694 		if (dev->amux_map[j] != EM28XX_AMUX_UNUSED)
1695 			i->audioset |= 1 << j;
1696 
1697 	return 0;
1698 }
1699 
1700 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1701 {
1702 	struct em28xx *dev = video_drvdata(file);
1703 
1704 	*i = dev->ctl_input;
1705 
1706 	return 0;
1707 }
1708 
1709 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1710 {
1711 	struct em28xx *dev = video_drvdata(file);
1712 
1713 	if (i >= MAX_EM28XX_INPUT)
1714 		return -EINVAL;
1715 	if (!INPUT(i)->type)
1716 		return -EINVAL;
1717 
1718 	video_mux(dev, i);
1719 	return 0;
1720 }
1721 
1722 static int em28xx_fill_audio_input(struct em28xx *dev,
1723 				   const char *s,
1724 				   struct v4l2_audio *a,
1725 				   unsigned int index)
1726 {
1727 	unsigned int idx = dev->amux_map[index];
1728 
1729 	/*
1730 	 * With msp3400, almost all mappings use the default (amux = 0).
1731 	 * The only one may use a different value is WinTV USB2, where it
1732 	 * can also be SCART1 input.
1733 	 * As it is very doubtful that we would see new boards with msp3400,
1734 	 * let's just reuse the existing switch.
1735 	 */
1736 	if (dev->has_msp34xx && idx != EM28XX_AMUX_UNUSED)
1737 		idx = EM28XX_AMUX_LINE_IN;
1738 
1739 	switch (idx) {
1740 	case EM28XX_AMUX_VIDEO:
1741 		strscpy(a->name, "Television", sizeof(a->name));
1742 		break;
1743 	case EM28XX_AMUX_LINE_IN:
1744 		strscpy(a->name, "Line In", sizeof(a->name));
1745 		break;
1746 	case EM28XX_AMUX_VIDEO2:
1747 		strscpy(a->name, "Television alt", sizeof(a->name));
1748 		break;
1749 	case EM28XX_AMUX_PHONE:
1750 		strscpy(a->name, "Phone", sizeof(a->name));
1751 		break;
1752 	case EM28XX_AMUX_MIC:
1753 		strscpy(a->name, "Mic", sizeof(a->name));
1754 		break;
1755 	case EM28XX_AMUX_CD:
1756 		strscpy(a->name, "CD", sizeof(a->name));
1757 		break;
1758 	case EM28XX_AMUX_AUX:
1759 		strscpy(a->name, "Aux", sizeof(a->name));
1760 		break;
1761 	case EM28XX_AMUX_PCM_OUT:
1762 		strscpy(a->name, "PCM", sizeof(a->name));
1763 		break;
1764 	case EM28XX_AMUX_UNUSED:
1765 	default:
1766 		return -EINVAL;
1767 	}
1768 	a->index = index;
1769 	a->capability = V4L2_AUDCAP_STEREO;
1770 
1771 	em28xx_videodbg("%s: audio input index %d is '%s'\n",
1772 			s, a->index, a->name);
1773 
1774 	return 0;
1775 }
1776 
1777 static int vidioc_enumaudio(struct file *file, void *fh, struct v4l2_audio *a)
1778 {
1779 	struct em28xx *dev = video_drvdata(file);
1780 
1781 	if (a->index >= MAX_EM28XX_INPUT)
1782 		return -EINVAL;
1783 
1784 	return em28xx_fill_audio_input(dev, __func__, a, a->index);
1785 }
1786 
1787 static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
1788 {
1789 	struct em28xx *dev = video_drvdata(file);
1790 	int i;
1791 
1792 	for (i = 0; i < MAX_EM28XX_INPUT; i++)
1793 		if (dev->ctl_ainput == dev->amux_map[i])
1794 			return em28xx_fill_audio_input(dev, __func__, a, i);
1795 
1796 	/* Should never happen! */
1797 	return -EINVAL;
1798 }
1799 
1800 static int vidioc_s_audio(struct file *file, void *priv,
1801 			  const struct v4l2_audio *a)
1802 {
1803 	struct em28xx *dev = video_drvdata(file);
1804 	int idx, i;
1805 
1806 	if (a->index >= MAX_EM28XX_INPUT)
1807 		return -EINVAL;
1808 
1809 	idx = dev->amux_map[a->index];
1810 
1811 	if (idx == EM28XX_AMUX_UNUSED)
1812 		return -EINVAL;
1813 
1814 	dev->ctl_ainput = idx;
1815 
1816 	/*
1817 	 * FIXME: This is wrong, as different inputs at em28xx_cards
1818 	 * may have different audio outputs. So, the right thing
1819 	 * to do is to implement VIDIOC_G_AUDOUT/VIDIOC_S_AUDOUT.
1820 	 * With the current board definitions, this would work fine,
1821 	 * as, currently, all boards fit.
1822 	 */
1823 	for (i = 0; i < MAX_EM28XX_INPUT; i++)
1824 		if (idx == dev->amux_map[i])
1825 			break;
1826 	if (i == MAX_EM28XX_INPUT)
1827 		return -EINVAL;
1828 
1829 	dev->ctl_aoutput = INPUT(i)->aout;
1830 
1831 	if (!dev->ctl_aoutput)
1832 		dev->ctl_aoutput = EM28XX_AOUT_MASTER;
1833 
1834 	em28xx_videodbg("%s: set audio input to %d\n", __func__,
1835 			dev->ctl_ainput);
1836 
1837 	return 0;
1838 }
1839 
1840 static int vidioc_g_tuner(struct file *file, void *priv,
1841 			  struct v4l2_tuner *t)
1842 {
1843 	struct em28xx *dev = video_drvdata(file);
1844 
1845 	if (t->index != 0)
1846 		return -EINVAL;
1847 
1848 	strscpy(t->name, "Tuner", sizeof(t->name));
1849 
1850 	v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
1851 	return 0;
1852 }
1853 
1854 static int vidioc_s_tuner(struct file *file, void *priv,
1855 			  const struct v4l2_tuner *t)
1856 {
1857 	struct em28xx *dev = video_drvdata(file);
1858 
1859 	if (t->index != 0)
1860 		return -EINVAL;
1861 
1862 	v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
1863 	return 0;
1864 }
1865 
1866 static int vidioc_g_frequency(struct file *file, void *priv,
1867 			      struct v4l2_frequency *f)
1868 {
1869 	struct em28xx         *dev = video_drvdata(file);
1870 	struct em28xx_v4l2    *v4l2 = dev->v4l2;
1871 
1872 	if (f->tuner != 0)
1873 		return -EINVAL;
1874 
1875 	f->frequency = v4l2->frequency;
1876 	return 0;
1877 }
1878 
1879 static int vidioc_s_frequency(struct file *file, void *priv,
1880 			      const struct v4l2_frequency *f)
1881 {
1882 	struct v4l2_frequency  new_freq = *f;
1883 	struct em28xx             *dev  = video_drvdata(file);
1884 	struct em28xx_v4l2        *v4l2 = dev->v4l2;
1885 
1886 	if (f->tuner != 0)
1887 		return -EINVAL;
1888 
1889 	v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_frequency, f);
1890 	v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, g_frequency, &new_freq);
1891 	v4l2->frequency = new_freq.frequency;
1892 
1893 	return 0;
1894 }
1895 
1896 #ifdef CONFIG_VIDEO_ADV_DEBUG
1897 static int vidioc_g_chip_info(struct file *file, void *priv,
1898 			      struct v4l2_dbg_chip_info *chip)
1899 {
1900 	struct em28xx *dev = video_drvdata(file);
1901 
1902 	if (chip->match.addr > 1)
1903 		return -EINVAL;
1904 	if (chip->match.addr == 1)
1905 		strscpy(chip->name, "ac97", sizeof(chip->name));
1906 	else
1907 		strscpy(chip->name,
1908 			dev->v4l2->v4l2_dev.name, sizeof(chip->name));
1909 	return 0;
1910 }
1911 
1912 static int em28xx_reg_len(int reg)
1913 {
1914 	switch (reg) {
1915 	case EM28XX_R40_AC97LSB:
1916 	case EM28XX_R30_HSCALELOW:
1917 	case EM28XX_R32_VSCALELOW:
1918 		return 2;
1919 	default:
1920 		return 1;
1921 	}
1922 }
1923 
1924 static int vidioc_g_register(struct file *file, void *priv,
1925 			     struct v4l2_dbg_register *reg)
1926 {
1927 	struct em28xx *dev = video_drvdata(file);
1928 	int ret;
1929 
1930 	if (reg->match.addr > 1)
1931 		return -EINVAL;
1932 	if (reg->match.addr) {
1933 		ret = em28xx_read_ac97(dev, reg->reg);
1934 		if (ret < 0)
1935 			return ret;
1936 
1937 		reg->val = ret;
1938 		reg->size = 1;
1939 		return 0;
1940 	}
1941 
1942 	/* Match host */
1943 	reg->size = em28xx_reg_len(reg->reg);
1944 	if (reg->size == 1) {
1945 		ret = em28xx_read_reg(dev, reg->reg);
1946 
1947 		if (ret < 0)
1948 			return ret;
1949 
1950 		reg->val = ret;
1951 	} else {
1952 		__le16 val = 0;
1953 
1954 		ret = dev->em28xx_read_reg_req_len(dev, USB_REQ_GET_STATUS,
1955 						   reg->reg, (char *)&val, 2);
1956 		if (ret < 0)
1957 			return ret;
1958 
1959 		reg->val = le16_to_cpu(val);
1960 	}
1961 
1962 	return 0;
1963 }
1964 
1965 static int vidioc_s_register(struct file *file, void *priv,
1966 			     const struct v4l2_dbg_register *reg)
1967 {
1968 	struct em28xx *dev = video_drvdata(file);
1969 	__le16 buf;
1970 
1971 	if (reg->match.addr > 1)
1972 		return -EINVAL;
1973 	if (reg->match.addr)
1974 		return em28xx_write_ac97(dev, reg->reg, reg->val);
1975 
1976 	/* Match host */
1977 	buf = cpu_to_le16(reg->val);
1978 
1979 	return em28xx_write_regs(dev, reg->reg, (char *)&buf,
1980 			       em28xx_reg_len(reg->reg));
1981 }
1982 #endif
1983 
1984 static int vidioc_querycap(struct file *file, void  *priv,
1985 			   struct v4l2_capability *cap)
1986 {
1987 	struct em28xx         *dev  = video_drvdata(file);
1988 	struct em28xx_v4l2    *v4l2 = dev->v4l2;
1989 	struct usb_device *udev = interface_to_usbdev(dev->intf);
1990 
1991 	strscpy(cap->driver, "em28xx", sizeof(cap->driver));
1992 	strscpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
1993 	usb_make_path(udev, cap->bus_info, sizeof(cap->bus_info));
1994 
1995 	cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_READWRITE |
1996 			    V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1997 	if (dev->int_audio_type != EM28XX_INT_AUDIO_NONE)
1998 		cap->capabilities |= V4L2_CAP_AUDIO;
1999 	if (dev->tuner_type != TUNER_ABSENT)
2000 		cap->capabilities |= V4L2_CAP_TUNER;
2001 	if (video_is_registered(&v4l2->vbi_dev))
2002 		cap->capabilities |= V4L2_CAP_VBI_CAPTURE;
2003 	if (video_is_registered(&v4l2->radio_dev))
2004 		cap->capabilities |= V4L2_CAP_RADIO;
2005 	return 0;
2006 }
2007 
2008 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
2009 				   struct v4l2_fmtdesc *f)
2010 {
2011 	if (unlikely(f->index >= ARRAY_SIZE(format)))
2012 		return -EINVAL;
2013 
2014 	strscpy(f->description, format[f->index].name, sizeof(f->description));
2015 	f->pixelformat = format[f->index].fourcc;
2016 
2017 	return 0;
2018 }
2019 
2020 static int vidioc_enum_framesizes(struct file *file, void *priv,
2021 				  struct v4l2_frmsizeenum *fsize)
2022 {
2023 	struct em28xx         *dev = video_drvdata(file);
2024 	struct em28xx_fmt     *fmt;
2025 	unsigned int	      maxw = norm_maxw(dev);
2026 	unsigned int	      maxh = norm_maxh(dev);
2027 
2028 	fmt = format_by_fourcc(fsize->pixel_format);
2029 	if (!fmt) {
2030 		em28xx_videodbg("Fourcc format (%08x) invalid.\n",
2031 				fsize->pixel_format);
2032 		return -EINVAL;
2033 	}
2034 
2035 	if (dev->board.is_em2800) {
2036 		if (fsize->index > 1)
2037 			return -EINVAL;
2038 		fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
2039 		fsize->discrete.width = maxw / (1 + fsize->index);
2040 		fsize->discrete.height = maxh / (1 + fsize->index);
2041 		return 0;
2042 	}
2043 
2044 	if (fsize->index != 0)
2045 		return -EINVAL;
2046 
2047 	/* Report a continuous range */
2048 	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
2049 	scale_to_size(dev, EM28XX_HVSCALE_MAX, EM28XX_HVSCALE_MAX,
2050 		      &fsize->stepwise.min_width, &fsize->stepwise.min_height);
2051 	if (fsize->stepwise.min_width < 48)
2052 		fsize->stepwise.min_width = 48;
2053 	if (fsize->stepwise.min_height < 38)
2054 		fsize->stepwise.min_height = 38;
2055 	fsize->stepwise.max_width = maxw;
2056 	fsize->stepwise.max_height = maxh;
2057 	fsize->stepwise.step_width = 1;
2058 	fsize->stepwise.step_height = 1;
2059 	return 0;
2060 }
2061 
2062 /* RAW VBI ioctls */
2063 
2064 static int vidioc_g_fmt_vbi_cap(struct file *file, void *priv,
2065 				struct v4l2_format *format)
2066 {
2067 	struct em28xx         *dev  = video_drvdata(file);
2068 	struct em28xx_v4l2    *v4l2 = dev->v4l2;
2069 
2070 	format->fmt.vbi.samples_per_line = v4l2->vbi_width;
2071 	format->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
2072 	format->fmt.vbi.offset = 0;
2073 	format->fmt.vbi.flags = 0;
2074 	format->fmt.vbi.sampling_rate = 6750000 * 4 / 2;
2075 	format->fmt.vbi.count[0] = v4l2->vbi_height;
2076 	format->fmt.vbi.count[1] = v4l2->vbi_height;
2077 	memset(format->fmt.vbi.reserved, 0, sizeof(format->fmt.vbi.reserved));
2078 
2079 	/* Varies by video standard (NTSC, PAL, etc.) */
2080 	if (v4l2->norm & V4L2_STD_525_60) {
2081 		/* NTSC */
2082 		format->fmt.vbi.start[0] = 10;
2083 		format->fmt.vbi.start[1] = 273;
2084 	} else if (v4l2->norm & V4L2_STD_625_50) {
2085 		/* PAL */
2086 		format->fmt.vbi.start[0] = 6;
2087 		format->fmt.vbi.start[1] = 318;
2088 	}
2089 
2090 	return 0;
2091 }
2092 
2093 /*
2094  * RADIO ESPECIFIC IOCTLS
2095  */
2096 
2097 static int radio_g_tuner(struct file *file, void *priv,
2098 			 struct v4l2_tuner *t)
2099 {
2100 	struct em28xx *dev = video_drvdata(file);
2101 
2102 	if (unlikely(t->index > 0))
2103 		return -EINVAL;
2104 
2105 	strscpy(t->name, "Radio", sizeof(t->name));
2106 
2107 	v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
2108 
2109 	return 0;
2110 }
2111 
2112 static int radio_s_tuner(struct file *file, void *priv,
2113 			 const struct v4l2_tuner *t)
2114 {
2115 	struct em28xx *dev = video_drvdata(file);
2116 
2117 	if (t->index != 0)
2118 		return -EINVAL;
2119 
2120 	v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
2121 
2122 	return 0;
2123 }
2124 
2125 /*
2126  * em28xx_free_v4l2() - Free struct em28xx_v4l2
2127  *
2128  * @ref: struct kref for struct em28xx_v4l2
2129  *
2130  * Called when all users of struct em28xx_v4l2 are gone
2131  */
2132 static void em28xx_free_v4l2(struct kref *ref)
2133 {
2134 	struct em28xx_v4l2 *v4l2 = container_of(ref, struct em28xx_v4l2, ref);
2135 
2136 	v4l2->dev->v4l2 = NULL;
2137 	kfree(v4l2);
2138 }
2139 
2140 /*
2141  * em28xx_v4l2_open()
2142  * inits the device and starts isoc transfer
2143  */
2144 static int em28xx_v4l2_open(struct file *filp)
2145 {
2146 	struct video_device *vdev = video_devdata(filp);
2147 	struct em28xx *dev = video_drvdata(filp);
2148 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
2149 	enum v4l2_buf_type fh_type = 0;
2150 	int ret;
2151 
2152 	switch (vdev->vfl_type) {
2153 	case VFL_TYPE_GRABBER:
2154 		fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2155 		break;
2156 	case VFL_TYPE_VBI:
2157 		fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
2158 		break;
2159 	case VFL_TYPE_RADIO:
2160 		break;
2161 	default:
2162 		return -EINVAL;
2163 	}
2164 
2165 	em28xx_videodbg("open dev=%s type=%s users=%d\n",
2166 			video_device_node_name(vdev), v4l2_type_names[fh_type],
2167 			v4l2->users);
2168 
2169 	if (mutex_lock_interruptible(&dev->lock))
2170 		return -ERESTARTSYS;
2171 
2172 	ret = v4l2_fh_open(filp);
2173 	if (ret) {
2174 		dev_err(&dev->intf->dev,
2175 			"%s: v4l2_fh_open() returned error %d\n",
2176 		       __func__, ret);
2177 		mutex_unlock(&dev->lock);
2178 		return ret;
2179 	}
2180 
2181 	if (v4l2->users == 0) {
2182 		em28xx_set_mode(dev, EM28XX_ANALOG_MODE);
2183 
2184 		if (vdev->vfl_type != VFL_TYPE_RADIO)
2185 			em28xx_resolution_set(dev);
2186 
2187 		/*
2188 		 * Needed, since GPIO might have disabled power
2189 		 * of some i2c devices
2190 		 */
2191 		em28xx_wake_i2c(dev);
2192 	}
2193 
2194 	if (vdev->vfl_type == VFL_TYPE_RADIO) {
2195 		em28xx_videodbg("video_open: setting radio device\n");
2196 		v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_radio);
2197 	}
2198 
2199 	kref_get(&dev->ref);
2200 	kref_get(&v4l2->ref);
2201 	v4l2->users++;
2202 
2203 	mutex_unlock(&dev->lock);
2204 
2205 	return 0;
2206 }
2207 
2208 /*
2209  * em28xx_v4l2_fini()
2210  * unregisters the v4l2,i2c and usb devices
2211  * called when the device gets disconected or at module unload
2212  */
2213 static int em28xx_v4l2_fini(struct em28xx *dev)
2214 {
2215 	struct em28xx_v4l2 *v4l2 = dev->v4l2;
2216 
2217 	if (dev->is_audio_only) {
2218 		/* Shouldn't initialize IR for this interface */
2219 		return 0;
2220 	}
2221 
2222 	if (!dev->has_video) {
2223 		/* This device does not support the v4l2 extension */
2224 		return 0;
2225 	}
2226 
2227 	if (!v4l2)
2228 		return 0;
2229 
2230 	dev_info(&dev->intf->dev, "Closing video extension\n");
2231 
2232 	mutex_lock(&dev->lock);
2233 
2234 	v4l2_device_disconnect(&v4l2->v4l2_dev);
2235 
2236 	em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
2237 
2238 	em28xx_v4l2_media_release(dev);
2239 
2240 	if (video_is_registered(&v4l2->radio_dev)) {
2241 		dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
2242 			 video_device_node_name(&v4l2->radio_dev));
2243 		video_unregister_device(&v4l2->radio_dev);
2244 	}
2245 	if (video_is_registered(&v4l2->vbi_dev)) {
2246 		dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
2247 			 video_device_node_name(&v4l2->vbi_dev));
2248 		video_unregister_device(&v4l2->vbi_dev);
2249 	}
2250 	if (video_is_registered(&v4l2->vdev)) {
2251 		dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
2252 			 video_device_node_name(&v4l2->vdev));
2253 		video_unregister_device(&v4l2->vdev);
2254 	}
2255 
2256 	v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
2257 	v4l2_device_unregister(&v4l2->v4l2_dev);
2258 
2259 	kref_put(&v4l2->ref, em28xx_free_v4l2);
2260 
2261 	mutex_unlock(&dev->lock);
2262 
2263 	kref_put(&dev->ref, em28xx_free_device);
2264 
2265 	return 0;
2266 }
2267 
2268 static int em28xx_v4l2_suspend(struct em28xx *dev)
2269 {
2270 	if (dev->is_audio_only)
2271 		return 0;
2272 
2273 	if (!dev->has_video)
2274 		return 0;
2275 
2276 	dev_info(&dev->intf->dev, "Suspending video extension\n");
2277 	em28xx_stop_urbs(dev);
2278 	return 0;
2279 }
2280 
2281 static int em28xx_v4l2_resume(struct em28xx *dev)
2282 {
2283 	if (dev->is_audio_only)
2284 		return 0;
2285 
2286 	if (!dev->has_video)
2287 		return 0;
2288 
2289 	dev_info(&dev->intf->dev, "Resuming video extension\n");
2290 	/* what do we do here */
2291 	return 0;
2292 }
2293 
2294 /*
2295  * em28xx_v4l2_close()
2296  * stops streaming and deallocates all resources allocated by the v4l2
2297  * calls and ioctls
2298  */
2299 static int em28xx_v4l2_close(struct file *filp)
2300 {
2301 	struct em28xx         *dev  = video_drvdata(filp);
2302 	struct em28xx_v4l2    *v4l2 = dev->v4l2;
2303 	struct usb_device *udev = interface_to_usbdev(dev->intf);
2304 	int              err;
2305 
2306 	em28xx_videodbg("users=%d\n", v4l2->users);
2307 
2308 	vb2_fop_release(filp);
2309 	mutex_lock(&dev->lock);
2310 
2311 	if (v4l2->users == 1) {
2312 		/* No sense to try to write to the device */
2313 		if (dev->disconnected)
2314 			goto exit;
2315 
2316 		/* Save some power by putting tuner to sleep */
2317 		v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);
2318 
2319 		/* do this before setting alternate! */
2320 		em28xx_set_mode(dev, EM28XX_SUSPEND);
2321 
2322 		/* set alternate 0 */
2323 		dev->alt = 0;
2324 		em28xx_videodbg("setting alternate 0\n");
2325 		err = usb_set_interface(udev, 0, 0);
2326 		if (err < 0) {
2327 			dev_err(&dev->intf->dev,
2328 				"cannot change alternate number to 0 (error=%i)\n",
2329 				err);
2330 		}
2331 	}
2332 
2333 exit:
2334 	v4l2->users--;
2335 	kref_put(&v4l2->ref, em28xx_free_v4l2);
2336 	mutex_unlock(&dev->lock);
2337 	kref_put(&dev->ref, em28xx_free_device);
2338 
2339 	return 0;
2340 }
2341 
2342 static const struct v4l2_file_operations em28xx_v4l_fops = {
2343 	.owner         = THIS_MODULE,
2344 	.open          = em28xx_v4l2_open,
2345 	.release       = em28xx_v4l2_close,
2346 	.read          = vb2_fop_read,
2347 	.poll          = vb2_fop_poll,
2348 	.mmap          = vb2_fop_mmap,
2349 	.unlocked_ioctl = video_ioctl2,
2350 };
2351 
2352 static const struct v4l2_ioctl_ops video_ioctl_ops = {
2353 	.vidioc_querycap            = vidioc_querycap,
2354 	.vidioc_enum_fmt_vid_cap    = vidioc_enum_fmt_vid_cap,
2355 	.vidioc_g_fmt_vid_cap       = vidioc_g_fmt_vid_cap,
2356 	.vidioc_try_fmt_vid_cap     = vidioc_try_fmt_vid_cap,
2357 	.vidioc_s_fmt_vid_cap       = vidioc_s_fmt_vid_cap,
2358 	.vidioc_g_fmt_vbi_cap       = vidioc_g_fmt_vbi_cap,
2359 	.vidioc_try_fmt_vbi_cap     = vidioc_g_fmt_vbi_cap,
2360 	.vidioc_s_fmt_vbi_cap       = vidioc_g_fmt_vbi_cap,
2361 	.vidioc_enum_framesizes     = vidioc_enum_framesizes,
2362 	.vidioc_enumaudio           = vidioc_enumaudio,
2363 	.vidioc_g_audio             = vidioc_g_audio,
2364 	.vidioc_s_audio             = vidioc_s_audio,
2365 
2366 	.vidioc_reqbufs             = vb2_ioctl_reqbufs,
2367 	.vidioc_create_bufs         = vb2_ioctl_create_bufs,
2368 	.vidioc_prepare_buf         = vb2_ioctl_prepare_buf,
2369 	.vidioc_querybuf            = vb2_ioctl_querybuf,
2370 	.vidioc_qbuf                = vb2_ioctl_qbuf,
2371 	.vidioc_dqbuf               = vb2_ioctl_dqbuf,
2372 
2373 	.vidioc_g_std               = vidioc_g_std,
2374 	.vidioc_querystd            = vidioc_querystd,
2375 	.vidioc_s_std               = vidioc_s_std,
2376 	.vidioc_g_parm		    = vidioc_g_parm,
2377 	.vidioc_s_parm		    = vidioc_s_parm,
2378 	.vidioc_enum_input          = vidioc_enum_input,
2379 	.vidioc_g_input             = vidioc_g_input,
2380 	.vidioc_s_input             = vidioc_s_input,
2381 	.vidioc_streamon            = vb2_ioctl_streamon,
2382 	.vidioc_streamoff           = vb2_ioctl_streamoff,
2383 	.vidioc_g_tuner             = vidioc_g_tuner,
2384 	.vidioc_s_tuner             = vidioc_s_tuner,
2385 	.vidioc_g_frequency         = vidioc_g_frequency,
2386 	.vidioc_s_frequency         = vidioc_s_frequency,
2387 	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2388 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2389 #ifdef CONFIG_VIDEO_ADV_DEBUG
2390 	.vidioc_g_chip_info         = vidioc_g_chip_info,
2391 	.vidioc_g_register          = vidioc_g_register,
2392 	.vidioc_s_register          = vidioc_s_register,
2393 #endif
2394 };
2395 
2396 static const struct video_device em28xx_video_template = {
2397 	.fops		= &em28xx_v4l_fops,
2398 	.ioctl_ops	= &video_ioctl_ops,
2399 	.release	= video_device_release_empty,
2400 	.tvnorms	= V4L2_STD_ALL,
2401 };
2402 
2403 static const struct v4l2_file_operations radio_fops = {
2404 	.owner         = THIS_MODULE,
2405 	.open          = em28xx_v4l2_open,
2406 	.release       = em28xx_v4l2_close,
2407 	.unlocked_ioctl = video_ioctl2,
2408 };
2409 
2410 static const struct v4l2_ioctl_ops radio_ioctl_ops = {
2411 	.vidioc_querycap      = vidioc_querycap,
2412 	.vidioc_g_tuner       = radio_g_tuner,
2413 	.vidioc_s_tuner       = radio_s_tuner,
2414 	.vidioc_g_frequency   = vidioc_g_frequency,
2415 	.vidioc_s_frequency   = vidioc_s_frequency,
2416 	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2417 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2418 #ifdef CONFIG_VIDEO_ADV_DEBUG
2419 	.vidioc_g_chip_info   = vidioc_g_chip_info,
2420 	.vidioc_g_register    = vidioc_g_register,
2421 	.vidioc_s_register    = vidioc_s_register,
2422 #endif
2423 };
2424 
2425 static struct video_device em28xx_radio_template = {
2426 	.fops		= &radio_fops,
2427 	.ioctl_ops	= &radio_ioctl_ops,
2428 	.release	= video_device_release_empty,
2429 };
2430 
2431 /* I2C possible address to saa7115, tvp5150, msp3400, tvaudio */
2432 static unsigned short saa711x_addrs[] = {
2433 	0x4a >> 1, 0x48 >> 1,   /* SAA7111, SAA7111A and SAA7113 */
2434 	0x42 >> 1, 0x40 >> 1,   /* SAA7114, SAA7115 and SAA7118 */
2435 	I2C_CLIENT_END };
2436 
2437 static unsigned short tvp5150_addrs[] = {
2438 	0xb8 >> 1,
2439 	0xba >> 1,
2440 	I2C_CLIENT_END
2441 };
2442 
2443 static unsigned short msp3400_addrs[] = {
2444 	0x80 >> 1,
2445 	0x88 >> 1,
2446 	I2C_CLIENT_END
2447 };
2448 
2449 /******************************** usb interface ******************************/
2450 
2451 static void em28xx_vdev_init(struct em28xx *dev,
2452 			     struct video_device *vfd,
2453 			     const struct video_device *template,
2454 			     const char *type_name)
2455 {
2456 	*vfd		= *template;
2457 	vfd->v4l2_dev	= &dev->v4l2->v4l2_dev;
2458 	vfd->lock	= &dev->lock;
2459 	if (dev->is_webcam)
2460 		vfd->tvnorms = 0;
2461 
2462 	snprintf(vfd->name, sizeof(vfd->name), "%s %s",
2463 		 dev_name(&dev->intf->dev), type_name);
2464 
2465 	video_set_drvdata(vfd, dev);
2466 }
2467 
2468 static void em28xx_tuner_setup(struct em28xx *dev, unsigned short tuner_addr)
2469 {
2470 	struct em28xx_v4l2      *v4l2 = dev->v4l2;
2471 	struct v4l2_device      *v4l2_dev = &v4l2->v4l2_dev;
2472 	struct tuner_setup      tun_setup;
2473 	struct v4l2_frequency   f;
2474 
2475 	memset(&tun_setup, 0, sizeof(tun_setup));
2476 
2477 	tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
2478 	tun_setup.tuner_callback = em28xx_tuner_callback;
2479 
2480 	if (dev->board.radio.type) {
2481 		tun_setup.type = dev->board.radio.type;
2482 		tun_setup.addr = dev->board.radio_addr;
2483 
2484 		v4l2_device_call_all(v4l2_dev,
2485 				     0, tuner, s_type_addr, &tun_setup);
2486 	}
2487 
2488 	if (dev->tuner_type != TUNER_ABSENT && dev->tuner_type) {
2489 		tun_setup.type   = dev->tuner_type;
2490 		tun_setup.addr   = tuner_addr;
2491 
2492 		v4l2_device_call_all(v4l2_dev,
2493 				     0, tuner, s_type_addr, &tun_setup);
2494 	}
2495 
2496 	if (dev->board.tda9887_conf) {
2497 		struct v4l2_priv_tun_config tda9887_cfg;
2498 
2499 		tda9887_cfg.tuner = TUNER_TDA9887;
2500 		tda9887_cfg.priv = &dev->board.tda9887_conf;
2501 
2502 		v4l2_device_call_all(v4l2_dev,
2503 				     0, tuner, s_config, &tda9887_cfg);
2504 	}
2505 
2506 	if (dev->tuner_type == TUNER_XC2028) {
2507 		struct v4l2_priv_tun_config  xc2028_cfg;
2508 		struct xc2028_ctrl           ctl;
2509 
2510 		memset(&xc2028_cfg, 0, sizeof(xc2028_cfg));
2511 		memset(&ctl, 0, sizeof(ctl));
2512 
2513 		em28xx_setup_xc3028(dev, &ctl);
2514 
2515 		xc2028_cfg.tuner = TUNER_XC2028;
2516 		xc2028_cfg.priv  = &ctl;
2517 
2518 		v4l2_device_call_all(v4l2_dev, 0, tuner, s_config, &xc2028_cfg);
2519 	}
2520 
2521 	/* configure tuner */
2522 	f.tuner = 0;
2523 	f.type = V4L2_TUNER_ANALOG_TV;
2524 	f.frequency = 9076;     /* just a magic number */
2525 	v4l2->frequency = f.frequency;
2526 	v4l2_device_call_all(v4l2_dev, 0, tuner, s_frequency, &f);
2527 }
2528 
2529 static int em28xx_v4l2_init(struct em28xx *dev)
2530 {
2531 	u8 val;
2532 	int ret;
2533 	unsigned int maxw;
2534 	struct v4l2_ctrl_handler *hdl;
2535 	struct em28xx_v4l2 *v4l2;
2536 
2537 	if (dev->is_audio_only) {
2538 		/* Shouldn't initialize IR for this interface */
2539 		return 0;
2540 	}
2541 
2542 	if (!dev->has_video) {
2543 		/* This device does not support the v4l2 extension */
2544 		return 0;
2545 	}
2546 
2547 	dev_info(&dev->intf->dev, "Registering V4L2 extension\n");
2548 
2549 	mutex_lock(&dev->lock);
2550 
2551 	v4l2 = kzalloc(sizeof(*v4l2), GFP_KERNEL);
2552 	if (!v4l2) {
2553 		mutex_unlock(&dev->lock);
2554 		return -ENOMEM;
2555 	}
2556 	kref_init(&v4l2->ref);
2557 	v4l2->dev = dev;
2558 	dev->v4l2 = v4l2;
2559 
2560 #ifdef CONFIG_MEDIA_CONTROLLER
2561 	v4l2->v4l2_dev.mdev = dev->media_dev;
2562 #endif
2563 	ret = v4l2_device_register(&dev->intf->dev, &v4l2->v4l2_dev);
2564 	if (ret < 0) {
2565 		dev_err(&dev->intf->dev,
2566 			"Call to v4l2_device_register() failed!\n");
2567 		goto err;
2568 	}
2569 
2570 	hdl = &v4l2->ctrl_handler;
2571 	v4l2_ctrl_handler_init(hdl, 8);
2572 	v4l2->v4l2_dev.ctrl_handler = hdl;
2573 
2574 	if (dev->is_webcam)
2575 		v4l2->progressive = true;
2576 
2577 	/*
2578 	 * Default format, used for tvp5150 or saa711x output formats
2579 	 */
2580 	v4l2->vinmode = EM28XX_VINMODE_YUV422_CbYCrY;
2581 	v4l2->vinctl  = EM28XX_VINCTRL_INTERLACED |
2582 			EM28XX_VINCTRL_CCIR656_ENABLE;
2583 
2584 	/* request some modules */
2585 
2586 	if (dev->has_msp34xx)
2587 		v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2588 				    &dev->i2c_adap[dev->def_i2c_bus],
2589 				    "msp3400", 0, msp3400_addrs);
2590 
2591 	if (dev->board.decoder == EM28XX_SAA711X)
2592 		v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2593 				    &dev->i2c_adap[dev->def_i2c_bus],
2594 				    "saa7115_auto", 0, saa711x_addrs);
2595 
2596 	if (dev->board.decoder == EM28XX_TVP5150)
2597 		v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2598 				    &dev->i2c_adap[dev->def_i2c_bus],
2599 				    "tvp5150", 0, tvp5150_addrs);
2600 
2601 	if (dev->board.adecoder == EM28XX_TVAUDIO)
2602 		v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2603 				    &dev->i2c_adap[dev->def_i2c_bus],
2604 				    "tvaudio", dev->board.tvaudio_addr, NULL);
2605 
2606 	/* Initialize tuner and camera */
2607 
2608 	if (dev->board.tuner_type != TUNER_ABSENT) {
2609 		unsigned short tuner_addr = dev->board.tuner_addr;
2610 		int has_demod = (dev->board.tda9887_conf & TDA9887_PRESENT);
2611 
2612 		if (dev->board.radio.type)
2613 			v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2614 					    &dev->i2c_adap[dev->def_i2c_bus],
2615 					    "tuner", dev->board.radio_addr,
2616 					    NULL);
2617 
2618 		if (has_demod)
2619 			v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2620 					    &dev->i2c_adap[dev->def_i2c_bus],
2621 					    "tuner", 0,
2622 					    v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
2623 		if (tuner_addr == 0) {
2624 			enum v4l2_i2c_tuner_type type =
2625 				has_demod ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
2626 			struct v4l2_subdev *sd;
2627 
2628 			sd = v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2629 						 &dev->i2c_adap[dev->def_i2c_bus],
2630 						 "tuner", 0,
2631 						 v4l2_i2c_tuner_addrs(type));
2632 
2633 			if (sd)
2634 				tuner_addr = v4l2_i2c_subdev_addr(sd);
2635 		} else {
2636 			v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2637 					    &dev->i2c_adap[dev->def_i2c_bus],
2638 					    "tuner", tuner_addr, NULL);
2639 		}
2640 
2641 		em28xx_tuner_setup(dev, tuner_addr);
2642 	}
2643 
2644 	if (dev->em28xx_sensor != EM28XX_NOSENSOR)
2645 		em28xx_init_camera(dev);
2646 
2647 	/* Configure audio */
2648 	ret = em28xx_audio_setup(dev);
2649 	if (ret < 0) {
2650 		dev_err(&dev->intf->dev,
2651 			"%s: Error while setting audio - error [%d]!\n",
2652 			__func__, ret);
2653 		goto unregister_dev;
2654 	}
2655 	if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
2656 		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2657 				  V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
2658 		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2659 				  V4L2_CID_AUDIO_VOLUME, 0, 0x1f, 1, 0x1f);
2660 	} else {
2661 		/* install the em28xx notify callback */
2662 		v4l2_ctrl_notify(v4l2_ctrl_find(hdl, V4L2_CID_AUDIO_MUTE),
2663 				 em28xx_ctrl_notify, dev);
2664 		v4l2_ctrl_notify(v4l2_ctrl_find(hdl, V4L2_CID_AUDIO_VOLUME),
2665 				 em28xx_ctrl_notify, dev);
2666 	}
2667 
2668 	/* wake i2c devices */
2669 	em28xx_wake_i2c(dev);
2670 
2671 	/* init video dma queues */
2672 	INIT_LIST_HEAD(&dev->vidq.active);
2673 	INIT_LIST_HEAD(&dev->vbiq.active);
2674 
2675 	if (dev->has_msp34xx) {
2676 		/* Send a reset to other chips via gpio */
2677 		ret = em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xf7);
2678 		if (ret < 0) {
2679 			dev_err(&dev->intf->dev,
2680 				"%s: em28xx_write_reg - msp34xx(1) failed! error [%d]\n",
2681 				__func__, ret);
2682 			goto unregister_dev;
2683 		}
2684 		usleep_range(10000, 11000);
2685 
2686 		ret = em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xff);
2687 		if (ret < 0) {
2688 			dev_err(&dev->intf->dev,
2689 				"%s: em28xx_write_reg - msp34xx(2) failed! error [%d]\n",
2690 				__func__, ret);
2691 			goto unregister_dev;
2692 		}
2693 		usleep_range(10000, 11000);
2694 	}
2695 
2696 	/* set default norm */
2697 	v4l2->norm = V4L2_STD_PAL;
2698 	v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
2699 	v4l2->interlaced_fieldmode = EM28XX_INTERLACED_DEFAULT;
2700 
2701 	/* Analog specific initialization */
2702 	v4l2->format = &format[0];
2703 
2704 	maxw = norm_maxw(dev);
2705 	/*
2706 	 * MaxPacketSize for em2800 is too small to capture at full resolution
2707 	 * use half of maxw as the scaler can only scale to 50%
2708 	 */
2709 	if (dev->board.is_em2800)
2710 		maxw /= 2;
2711 
2712 	em28xx_set_video_format(dev, format[0].fourcc,
2713 				maxw, norm_maxh(dev));
2714 
2715 	video_mux(dev, 0);
2716 
2717 	/* Audio defaults */
2718 	dev->mute = 1;
2719 	dev->volume = 0x1f;
2720 
2721 /*	em28xx_write_reg(dev, EM28XX_R0E_AUDIOSRC, 0xc0); audio register */
2722 	val = (u8)em28xx_read_reg(dev, EM28XX_R0F_XCLK);
2723 	em28xx_write_reg(dev, EM28XX_R0F_XCLK,
2724 			 (EM28XX_XCLK_AUDIO_UNMUTE | val));
2725 
2726 	em28xx_set_outfmt(dev);
2727 
2728 	/* Add image controls */
2729 
2730 	/*
2731 	 * NOTE: at this point, the subdevices are already registered, so
2732 	 * bridge controls are only added/enabled when no subdevice provides
2733 	 * them
2734 	 */
2735 	if (!v4l2_ctrl_find(hdl, V4L2_CID_CONTRAST))
2736 		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2737 				  V4L2_CID_CONTRAST,
2738 				  0, 0x1f, 1, CONTRAST_DEFAULT);
2739 	if (!v4l2_ctrl_find(hdl, V4L2_CID_BRIGHTNESS))
2740 		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2741 				  V4L2_CID_BRIGHTNESS,
2742 				  -0x80, 0x7f, 1, BRIGHTNESS_DEFAULT);
2743 	if (!v4l2_ctrl_find(hdl, V4L2_CID_SATURATION))
2744 		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2745 				  V4L2_CID_SATURATION,
2746 				  0, 0x1f, 1, SATURATION_DEFAULT);
2747 	if (!v4l2_ctrl_find(hdl, V4L2_CID_BLUE_BALANCE))
2748 		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2749 				  V4L2_CID_BLUE_BALANCE,
2750 				  -0x30, 0x30, 1, BLUE_BALANCE_DEFAULT);
2751 	if (!v4l2_ctrl_find(hdl, V4L2_CID_RED_BALANCE))
2752 		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2753 				  V4L2_CID_RED_BALANCE,
2754 				  -0x30, 0x30, 1, RED_BALANCE_DEFAULT);
2755 	if (!v4l2_ctrl_find(hdl, V4L2_CID_SHARPNESS))
2756 		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2757 				  V4L2_CID_SHARPNESS,
2758 				  0, 0x0f, 1, SHARPNESS_DEFAULT);
2759 
2760 	/* Reset image controls */
2761 	em28xx_colorlevels_set_default(dev);
2762 	v4l2_ctrl_handler_setup(hdl);
2763 	ret = hdl->error;
2764 	if (ret)
2765 		goto unregister_dev;
2766 
2767 	/* allocate and fill video video_device struct */
2768 	em28xx_vdev_init(dev, &v4l2->vdev, &em28xx_video_template, "video");
2769 	mutex_init(&v4l2->vb_queue_lock);
2770 	mutex_init(&v4l2->vb_vbi_queue_lock);
2771 	v4l2->vdev.queue = &v4l2->vb_vidq;
2772 	v4l2->vdev.queue->lock = &v4l2->vb_queue_lock;
2773 	v4l2->vdev.device_caps = V4L2_CAP_READWRITE | V4L2_CAP_VIDEO_CAPTURE |
2774 				 V4L2_CAP_STREAMING;
2775 	if (dev->int_audio_type != EM28XX_INT_AUDIO_NONE)
2776 		v4l2->vdev.device_caps |= V4L2_CAP_AUDIO;
2777 	if (dev->tuner_type != TUNER_ABSENT)
2778 		v4l2->vdev.device_caps |= V4L2_CAP_TUNER;
2779 
2780 
2781 	/* disable inapplicable ioctls */
2782 	if (dev->is_webcam) {
2783 		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_QUERYSTD);
2784 		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_STD);
2785 		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_STD);
2786 	} else {
2787 		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_PARM);
2788 	}
2789 	if (dev->tuner_type == TUNER_ABSENT) {
2790 		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_TUNER);
2791 		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_TUNER);
2792 		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_FREQUENCY);
2793 		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_FREQUENCY);
2794 	}
2795 	if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
2796 		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_AUDIO);
2797 		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_AUDIO);
2798 	}
2799 
2800 	/* register v4l2 video video_device */
2801 	ret = video_register_device(&v4l2->vdev, VFL_TYPE_GRABBER,
2802 				    video_nr[dev->devno]);
2803 	if (ret) {
2804 		dev_err(&dev->intf->dev,
2805 			"unable to register video device (error=%i).\n", ret);
2806 		goto unregister_dev;
2807 	}
2808 
2809 	/* Allocate and fill vbi video_device struct */
2810 	if (em28xx_vbi_supported(dev) == 1) {
2811 		em28xx_vdev_init(dev, &v4l2->vbi_dev, &em28xx_video_template,
2812 				 "vbi");
2813 
2814 		v4l2->vbi_dev.queue = &v4l2->vb_vbiq;
2815 		v4l2->vbi_dev.queue->lock = &v4l2->vb_vbi_queue_lock;
2816 		v4l2->vbi_dev.device_caps = V4L2_CAP_STREAMING |
2817 			V4L2_CAP_READWRITE | V4L2_CAP_VBI_CAPTURE;
2818 		if (dev->tuner_type != TUNER_ABSENT)
2819 			v4l2->vbi_dev.device_caps |= V4L2_CAP_TUNER;
2820 
2821 		/* disable inapplicable ioctls */
2822 		v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_PARM);
2823 		if (dev->tuner_type == TUNER_ABSENT) {
2824 			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_TUNER);
2825 			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_TUNER);
2826 			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_FREQUENCY);
2827 			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_FREQUENCY);
2828 		}
2829 		if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
2830 			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_AUDIO);
2831 			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_AUDIO);
2832 		}
2833 
2834 		/* register v4l2 vbi video_device */
2835 		ret = video_register_device(&v4l2->vbi_dev, VFL_TYPE_VBI,
2836 					    vbi_nr[dev->devno]);
2837 		if (ret < 0) {
2838 			dev_err(&dev->intf->dev,
2839 				"unable to register vbi device\n");
2840 			goto unregister_dev;
2841 		}
2842 	}
2843 
2844 	if (em28xx_boards[dev->model].radio.type == EM28XX_RADIO) {
2845 		em28xx_vdev_init(dev, &v4l2->radio_dev, &em28xx_radio_template,
2846 				 "radio");
2847 		v4l2->radio_dev.device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER;
2848 		ret = video_register_device(&v4l2->radio_dev, VFL_TYPE_RADIO,
2849 					    radio_nr[dev->devno]);
2850 		if (ret < 0) {
2851 			dev_err(&dev->intf->dev,
2852 				"can't register radio device\n");
2853 			goto unregister_dev;
2854 		}
2855 		dev_info(&dev->intf->dev,
2856 			 "Registered radio device as %s\n",
2857 			 video_device_node_name(&v4l2->radio_dev));
2858 	}
2859 
2860 	/* Init entities at the Media Controller */
2861 	em28xx_v4l2_create_entities(dev);
2862 
2863 #ifdef CONFIG_MEDIA_CONTROLLER
2864 	ret = v4l2_mc_create_media_graph(dev->media_dev);
2865 	if (ret) {
2866 		dev_err(&dev->intf->dev,
2867 			"failed to create media graph\n");
2868 		em28xx_v4l2_media_release(dev);
2869 		goto unregister_dev;
2870 	}
2871 #endif
2872 
2873 	dev_info(&dev->intf->dev,
2874 		 "V4L2 video device registered as %s\n",
2875 		 video_device_node_name(&v4l2->vdev));
2876 
2877 	if (video_is_registered(&v4l2->vbi_dev))
2878 		dev_info(&dev->intf->dev,
2879 			 "V4L2 VBI device registered as %s\n",
2880 			 video_device_node_name(&v4l2->vbi_dev));
2881 
2882 	/* Save some power by putting tuner to sleep */
2883 	v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);
2884 
2885 	/* initialize videobuf2 stuff */
2886 	em28xx_vb2_setup(dev);
2887 
2888 	dev_info(&dev->intf->dev,
2889 		 "V4L2 extension successfully initialized\n");
2890 
2891 	kref_get(&dev->ref);
2892 
2893 	mutex_unlock(&dev->lock);
2894 	return 0;
2895 
2896 unregister_dev:
2897 	if (video_is_registered(&v4l2->radio_dev)) {
2898 		dev_info(&dev->intf->dev,
2899 			 "V4L2 device %s deregistered\n",
2900 			 video_device_node_name(&v4l2->radio_dev));
2901 		video_unregister_device(&v4l2->radio_dev);
2902 	}
2903 	if (video_is_registered(&v4l2->vbi_dev)) {
2904 		dev_info(&dev->intf->dev,
2905 			 "V4L2 device %s deregistered\n",
2906 			 video_device_node_name(&v4l2->vbi_dev));
2907 		video_unregister_device(&v4l2->vbi_dev);
2908 	}
2909 	if (video_is_registered(&v4l2->vdev)) {
2910 		dev_info(&dev->intf->dev,
2911 			 "V4L2 device %s deregistered\n",
2912 			 video_device_node_name(&v4l2->vdev));
2913 		video_unregister_device(&v4l2->vdev);
2914 	}
2915 
2916 	v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
2917 	v4l2_device_unregister(&v4l2->v4l2_dev);
2918 err:
2919 	dev->v4l2 = NULL;
2920 	kref_put(&v4l2->ref, em28xx_free_v4l2);
2921 	mutex_unlock(&dev->lock);
2922 	return ret;
2923 }
2924 
2925 static struct em28xx_ops v4l2_ops = {
2926 	.id   = EM28XX_V4L2,
2927 	.name = "Em28xx v4l2 Extension",
2928 	.init = em28xx_v4l2_init,
2929 	.fini = em28xx_v4l2_fini,
2930 	.suspend = em28xx_v4l2_suspend,
2931 	.resume = em28xx_v4l2_resume,
2932 };
2933 
2934 static int __init em28xx_video_register(void)
2935 {
2936 	return em28xx_register_extension(&v4l2_ops);
2937 }
2938 
2939 static void __exit em28xx_video_unregister(void)
2940 {
2941 	em28xx_unregister_extension(&v4l2_ops);
2942 }
2943 
2944 module_init(em28xx_video_register);
2945 module_exit(em28xx_video_unregister);
2946