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