drivers/media/usb/em28xx/em28xx-video.c

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