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