drivers/media/video/em28xx/em28xx.h

   1 /*
   2    em28xx.h - driver for Empia EM2800/EM2820/2840 USB video capture devices
   3
   4    Copyright (C) 2005 Markus Rechberger <mrechberger@gmail.com>
   5                       Ludovico Cavedon <cavedon@sssup.it>
   6                       Mauro Carvalho Chehab <mchehab@infradead.org>
   7
   8    Based on the em2800 driver from Sascha Sommer <saschasommer@freenet.de>
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #ifndef _EM28XX_H
  26 #define _EM28XX_H
  27
  28 #include <linux/videodev2.h>
  29 #include <media/videobuf-vmalloc.h>
  30
  31 #include <linux/i2c.h>
  32 #include <linux/mutex.h>
  33 #include <media/ir-kbd-i2c.h>
  34 #if defined(CONFIG_VIDEO_EM28XX_DVB) || defined(CONFIG_VIDEO_EM28XX_DVB_MODULE)
  35 #include <media/videobuf-dvb.h>
  36 #endif
  37 #include "tuner-xc2028.h"
  38
  39 /* Boards supported by driver */
  40 #define EM2800_BOARD_UNKNOWN                    0
  41 #define EM2820_BOARD_UNKNOWN                    1
  42 #define EM2820_BOARD_TERRATEC_CINERGY_250       2
  43 #define EM2820_BOARD_PINNACLE_USB_2             3
  44 #define EM2820_BOARD_HAUPPAUGE_WINTV_USB_2      4
  45 #define EM2820_BOARD_MSI_VOX_USB_2              5
  46 #define EM2800_BOARD_TERRATEC_CINERGY_200       6
  47 #define EM2800_BOARD_LEADTEK_WINFAST_USBII      7
  48 #define EM2800_BOARD_KWORLD_USB2800             8
  49 #define EM2820_BOARD_PINNACLE_DVC_90            9
  50 #define EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900    10
  51 #define EM2880_BOARD_TERRATEC_HYBRID_XS         11
  52 #define EM2820_BOARD_KWORLD_PVRTV2800RF         12
  53 #define EM2880_BOARD_TERRATEC_PRODIGY_XS        13
  54 #define EM2820_BOARD_PROLINK_PLAYTV_USB2        14
  55 #define EM2800_BOARD_VGEAR_POCKETTV             15
  56 #define EM2880_BOARD_HAUPPAUGE_WINTV_HVR_950    16
  57
  58 /* Limits minimum and default number of buffers */
  59 #define EM28XX_MIN_BUF 4
  60 #define EM28XX_DEF_BUF 8
  61
  62 /* maximum number of em28xx boards */
  63 #define EM28XX_MAXBOARDS 4 /*FIXME: should be bigger */
  64
  65 /* maximum number of frames that can be queued */
  66 #define EM28XX_NUM_FRAMES 5
  67 /* number of frames that get used for v4l2_read() */
  68 #define EM28XX_NUM_READ_FRAMES 2
  69
  70 /* number of buffers for isoc transfers */
  71 #define EM28XX_NUM_BUFS 5
  72
  73 /* number of packets for each buffer
  74    windows requests only 40 packets .. so we better do the same
  75    this is what I found out for all alternate numbers there!
  76  */
  77 #define EM28XX_NUM_PACKETS 40
  78
  79 /* default alternate; 0 means choose the best */
  80 #define EM28XX_PINOUT 0
  81
  82 #define EM28XX_INTERLACED_DEFAULT 1
  83
  84 /*
  85 #define (use usbview if you want to get the other alternate number infos)
  86 #define
  87 #define alternate number 2
  88 #define                         Endpoint Address: 82
  89                         Direction: in
  90                         Attribute: 1
  91                         Type: Isoc
  92                         Max Packet Size: 1448
  93                         Interval: 125us
  94
  95   alternate number 7
  96
  97                         Endpoint Address: 82
  98                         Direction: in
  99                         Attribute: 1
 100                         Type: Isoc
 101                         Max Packet Size: 3072
 102                         Interval: 125us
 103 */
 104
 105 /* time to wait when stopping the isoc transfer */
 106 #define EM28XX_URB_TIMEOUT       msecs_to_jiffies(EM28XX_NUM_BUFS * EM28XX_NUM_PACKETS)
 107
 108 /* time in msecs to wait for i2c writes to finish */
 109 #define EM2800_I2C_WRITE_TIMEOUT 20
 110
 111 enum em28xx_mode {
 112         EM28XX_ANALOG_MODE,
 113         EM28XX_DIGITAL_MODE,
 114 };
 115
 116 enum em28xx_stream_state {
 117         STREAM_OFF,
 118         STREAM_INTERRUPT,
 119         STREAM_ON,
 120 };
 121
 122 struct em28xx_usb_isoc_ctl {
 123                 /* max packet size of isoc transaction */
 124         int                             max_pkt_size;
 125
 126                 /* number of allocated urbs */
 127         int                             num_bufs;
 128
 129                 /* urb for isoc transfers */
 130         struct urb                      **urb;
 131
 132                 /* transfer buffers for isoc transfer */
 133         char                            **transfer_buffer;
 134
 135                 /* Last buffer command and region */
 136         u8                              cmd;
 137         int                             pos, size, pktsize;
 138
 139                 /* Last field: ODD or EVEN? */
 140         int                             field;
 141
 142                 /* Stores incomplete commands */
 143         u32                             tmp_buf;
 144         int                             tmp_buf_len;
 145
 146                 /* Stores already requested buffers */
 147         struct em28xx_buffer            *buf;
 148
 149                 /* Stores the number of received fields */
 150         int                             nfields;
 151 };
 152
 153 struct em28xx_fmt {
 154         char  *name;
 155         u32   fourcc;          /* v4l2 format id */
 156 };
 157
 158 /* buffer for one video frame */
 159 struct em28xx_buffer {
 160         /* common v4l buffer stuff -- must be first */
 161         struct videobuf_buffer vb;
 162
 163         struct list_head frame;
 164         int top_field;
 165         int receiving;
 166 };
 167
 168 struct em28xx_dmaqueue {
 169         struct list_head       active;
 170         struct list_head       queued;
 171
 172         wait_queue_head_t          wq;
 173
 174         /* Counters to control buffer fill */
 175         int                        pos;
 176 };
 177
 178 /* io methods */
 179 enum em28xx_io_method {
 180         IO_NONE,
 181         IO_READ,
 182         IO_MMAP,
 183 };
 184
 185 /* inputs */
 186
 187 #define MAX_EM28XX_INPUT 4
 188 enum enum28xx_itype {
 189         EM28XX_VMUX_COMPOSITE1 = 1,
 190         EM28XX_VMUX_COMPOSITE2,
 191         EM28XX_VMUX_COMPOSITE3,
 192         EM28XX_VMUX_COMPOSITE4,
 193         EM28XX_VMUX_SVIDEO,
 194         EM28XX_VMUX_TELEVISION,
 195         EM28XX_VMUX_CABLE,
 196         EM28XX_VMUX_DVB,
 197         EM28XX_VMUX_DEBUG,
 198         EM28XX_RADIO,
 199 };
 200
 201 enum em28xx_amux {
 202         EM28XX_AMUX_VIDEO,
 203         EM28XX_AMUX_LINE_IN,
 204         EM28XX_AMUX_AC97_VIDEO,
 205         EM28XX_AMUX_AC97_LINE_IN,
 206 };
 207
 208 struct em28xx_input {
 209         enum enum28xx_itype type;
 210         unsigned int vmux;
 211         enum em28xx_amux amux;
 212 };
 213
 214 #define INPUT(nr) (&em28xx_boards[dev->model].input[nr])
 215
 216 enum em28xx_decoder {
 217         EM28XX_TVP5150,
 218         EM28XX_SAA7113,
 219         EM28XX_SAA7114
 220 };
 221
 222 #define MAX_GPIO 2
 223 struct gpio_ctl {
 224                 /* Register to be set */
 225         unsigned char reg;
 226                 /* Initial/final value */
 227         unsigned char val;
 228                 /* reset value - if set, it will do:
 229                    val1 - val2 - val1
 230                  */
 231         unsigned char rst;
 232                 /* Sleep times
 233                  */
 234         unsigned int  t1, t2, t3;
 235 };
 236
 237 struct em28xx_board {
 238         char *name;
 239         int vchannels;
 240         int tuner_type;
 241
 242         /* i2c flags */
 243         unsigned int tda9887_conf;
 244
 245         unsigned int is_em2800:1;
 246         unsigned int has_msp34xx:1;
 247         unsigned int mts_firmware:1;
 248         unsigned int has_12mhz_i2s:1;
 249         unsigned int max_range_640_480:1;
 250         unsigned int has_dvb:1;
 251
 252         struct gpio_ctl analog_gpio[MAX_GPIO];
 253         struct gpio_ctl digital_gpio[MAX_GPIO];
 254
 255         enum em28xx_decoder decoder;
 256
 257         struct em28xx_input       input[MAX_EM28XX_INPUT];
 258         struct em28xx_input       radio;
 259 };
 260
 261 struct em28xx_eeprom {
 262         u32 id;                 /* 0x9567eb1a */
 263         u16 vendor_ID;
 264         u16 product_ID;
 265
 266         u16 chip_conf;
 267
 268         u16 board_conf;
 269
 270         u16 string1, string2, string3;
 271
 272         u8 string_idx_table;
 273 };
 274
 275 /* device states */
 276 enum em28xx_dev_state {
 277         DEV_INITIALIZED = 0x01,
 278         DEV_DISCONNECTED = 0x02,
 279         DEV_MISCONFIGURED = 0x04,
 280 };
 281
 282 #define EM28XX_AUDIO_BUFS 5
 283 #define EM28XX_NUM_AUDIO_PACKETS 64
 284 #define EM28XX_AUDIO_MAX_PACKET_SIZE 196 /* static value */
 285 #define EM28XX_CAPTURE_STREAM_EN 1
 286
 287 /* em28xx extensions */
 288 #define EM28XX_AUDIO   0x10
 289 #define EM28XX_DVB     0x20
 290
 291 struct em28xx_audio {
 292         char name[50];
 293         char *transfer_buffer[EM28XX_AUDIO_BUFS];
 294         struct urb *urb[EM28XX_AUDIO_BUFS];
 295         struct usb_device *udev;
 296         unsigned int capture_transfer_done;
 297         struct snd_pcm_substream   *capture_pcm_substream;
 298
 299         unsigned int hwptr_done_capture;
 300         struct snd_card            *sndcard;
 301
 302         int users, shutdown;
 303         enum em28xx_stream_state capture_stream;
 304         spinlock_t slock;
 305 };
 306
 307 struct em28xx;
 308
 309 struct em28xx_fh {
 310         struct em28xx *dev;
 311         unsigned int  stream_on:1;      /* Locks streams */
 312         int           radio;
 313
 314         struct videobuf_queue        vb_vidq;
 315
 316         enum v4l2_buf_type           type;
 317 };
 318
 319 /* main device struct */
 320 struct em28xx {
 321         /* generic device properties */
 322         char name[30];          /* name (including minor) of the device */
 323         int model;              /* index in the device_data struct */
 324         int devno;              /* marks the number of this device */
 325         unsigned int is_em2800:1;
 326         unsigned int has_msp34xx:1;
 327         unsigned int has_tda9887:1;
 328         unsigned int stream_on:1;       /* Locks streams */
 329         unsigned int has_audio_class:1;
 330         unsigned int has_12mhz_i2s:1;
 331         unsigned int max_range_640_480:1;
 332         unsigned int has_dvb:1;
 333
 334         struct gpio_ctl *analog_gpio;
 335         struct gpio_ctl *digital_gpio;
 336
 337         int video_inputs;       /* number of video inputs */
 338         struct list_head        devlist;
 339
 340         u32 i2s_speed;          /* I2S speed for audio digital stream */
 341
 342         enum em28xx_decoder decoder;
 343
 344         int tuner_type;         /* type of the tuner */
 345         int tuner_addr;         /* tuner address */
 346         int tda9887_conf;
 347         /* i2c i/o */
 348         struct i2c_adapter i2c_adap;
 349         struct i2c_client i2c_client;
 350         /* video for linux */
 351         int users;              /* user count for exclusive use */
 352         struct video_device *vdev;      /* video for linux device struct */
 353         v4l2_std_id norm;       /* selected tv norm */
 354         int ctl_freq;           /* selected frequency */
 355         unsigned int ctl_input; /* selected input */
 356         unsigned int ctl_ainput;        /* slected audio input */
 357         int mute;
 358         int volume;
 359         /* frame properties */
 360         int width;              /* current frame width */
 361         int height;             /* current frame height */
 362         int hscale;             /* horizontal scale factor (see datasheet) */
 363         int vscale;             /* vertical scale factor (see datasheet) */
 364         int interlaced;         /* 1=interlace fileds, 0=just top fileds */
 365         unsigned int video_bytesread;   /* Number of bytes read */
 366
 367         unsigned long hash;     /* eeprom hash - for boards with generic ID */
 368         unsigned long i2c_hash; /* i2c devicelist hash - for boards with generic ID */
 369
 370         struct em28xx_audio *adev;
 371
 372         /* states */
 373         enum em28xx_dev_state state;
 374         enum em28xx_io_method io;
 375
 376         struct work_struct         request_module_wk;
 377
 378         /* locks */
 379         struct mutex lock;
 380         /* spinlock_t queue_lock; */
 381         struct list_head inqueue, outqueue;
 382         wait_queue_head_t open, wait_frame, wait_stream;
 383         struct video_device *vbi_dev;
 384         struct video_device *radio_dev;
 385
 386         unsigned char eedata[256];
 387
 388         /* Isoc control struct */
 389         struct em28xx_dmaqueue vidq;
 390         struct em28xx_usb_isoc_ctl isoc_ctl;
 391         spinlock_t slock;
 392
 393         /* usb transfer */
 394         struct usb_device *udev;        /* the usb device */
 395         int alt;                /* alternate */
 396         int max_pkt_size;       /* max packet size of isoc transaction */
 397         int num_alt;            /* Number of alternative settings */
 398         unsigned int *alt_max_pkt_size; /* array of wMaxPacketSize */
 399         struct urb *urb[EM28XX_NUM_BUFS];       /* urb for isoc transfers */
 400         char *transfer_buffer[EM28XX_NUM_BUFS]; /* transfer buffers for isoc transfer */
 401         /* helper funcs that call usb_control_msg */
 402         int (*em28xx_write_regs) (struct em28xx * dev, u16 reg, char *buf,
 403                                   int len);
 404         int (*em28xx_read_reg) (struct em28xx * dev, u16 reg);
 405         int (*em28xx_read_reg_req_len) (struct em28xx * dev, u8 req, u16 reg,
 406                                         char *buf, int len);
 407         int (*em28xx_write_regs_req) (struct em28xx * dev, u8 req, u16 reg,
 408                                       char *buf, int len);
 409         int (*em28xx_read_reg_req) (struct em28xx * dev, u8 req, u16 reg);
 410
 411         enum em28xx_mode mode;
 412
 413 #if defined(CONFIG_VIDEO_EM28XX_DVB) || defined(CONFIG_VIDEO_EM28XX_DVB_MODULE)
 414         struct videobuf_dvb        dvb;
 415         struct videobuf_queue_ops  *qops;
 416         struct em28xx_fh           dvb_fh;
 417 #endif
 418 };
 419
 420 struct em28xx_ops {
 421         struct list_head next;
 422         char *name;
 423         int id;
 424         int (*init)(struct em28xx *);
 425         int (*fini)(struct em28xx *);
 426 };
 427
 428 /* Provided by em28xx-i2c.c */
 429
 430 void em28xx_i2c_call_clients(struct em28xx *dev, unsigned int cmd, void *arg);
 431 void em28xx_do_i2c_scan(struct em28xx *dev);
 432 int em28xx_i2c_register(struct em28xx *dev);
 433 int em28xx_i2c_unregister(struct em28xx *dev);
 434
 435 /* Provided by em28xx-core.c */
 436
 437 u32 em28xx_request_buffers(struct em28xx *dev, u32 count);
 438 void em28xx_queue_unusedframes(struct em28xx *dev);
 439 void em28xx_release_buffers(struct em28xx *dev);
 440
 441 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
 442                             char *buf, int len);
 443 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg);
 444 int em28xx_read_reg(struct em28xx *dev, u16 reg);
 445 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
 446                           int len);
 447 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len);
 448 int em28xx_audio_analog_set(struct em28xx *dev);
 449
 450 int em28xx_colorlevels_set_default(struct em28xx *dev);
 451 int em28xx_capture_start(struct em28xx *dev, int start);
 452 int em28xx_outfmt_set_yuv422(struct em28xx *dev);
 453 int em28xx_resolution_set(struct em28xx *dev);
 454 int em28xx_set_alternate(struct em28xx *dev);
 455
 456 /* Provided by em28xx-video.c */
 457 int em28xx_register_extension(struct em28xx_ops *dev);
 458 void em28xx_unregister_extension(struct em28xx_ops *dev);
 459
 460 /* Provided by em28xx-cards.c */
 461 extern int em2800_variant_detect(struct usb_device* udev,int model);
 462 extern void em28xx_pre_card_setup(struct em28xx *dev);
 463 extern void em28xx_card_setup(struct em28xx *dev);
 464 extern struct em28xx_board em28xx_boards[];
 465 extern struct usb_device_id em28xx_id_table[];
 466 extern const unsigned int em28xx_bcount;
 467 void em28xx_set_ir(struct em28xx *dev, struct IR_i2c *ir);
 468 int em28xx_tuner_callback(void *ptr, int command, int arg);
 469 void em28xx_setup_xc3028(struct em28xx *dev, struct xc2028_ctrl *ctl);
 470
 471 /* Provided by em28xx-input.c */
 472 /* TODO: Check if the standard get_key handlers on ir-common can be used */
 473 int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw);
 474 int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw);
 475 int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
 476                                      u32 *ir_raw);
 477
 478 /* em2800 registers */
 479 #define EM2800_AUDIOSRC_REG 0x08
 480
 481 /* em28xx registers */
 482 #define I2C_CLK_REG     0x06
 483 #define CHIPID_REG      0x0a
 484 #define USBSUSP_REG     0x0c    /* */
 485
 486 #define AUDIOSRC_REG    0x0e
 487 #define XCLK_REG        0x0f
 488
 489 #define VINMODE_REG     0x10
 490 #define VINCTRL_REG     0x11
 491 #define VINENABLE_REG   0x12    /* */
 492
 493 #define GAMMA_REG       0x14
 494 #define RGAIN_REG       0x15
 495 #define GGAIN_REG       0x16
 496 #define BGAIN_REG       0x17
 497 #define ROFFSET_REG     0x18
 498 #define GOFFSET_REG     0x19
 499 #define BOFFSET_REG     0x1a
 500
 501 #define OFLOW_REG       0x1b
 502 #define HSTART_REG      0x1c
 503 #define VSTART_REG      0x1d
 504 #define CWIDTH_REG      0x1e
 505 #define CHEIGHT_REG     0x1f
 506
 507 #define YGAIN_REG       0x20
 508 #define YOFFSET_REG     0x21
 509 #define UVGAIN_REG      0x22
 510 #define UOFFSET_REG     0x23
 511 #define VOFFSET_REG     0x24
 512 #define SHARPNESS_REG   0x25
 513
 514 #define COMPR_REG       0x26
 515 #define OUTFMT_REG      0x27
 516
 517 #define XMIN_REG        0x28
 518 #define XMAX_REG        0x29
 519 #define YMIN_REG        0x2a
 520 #define YMAX_REG        0x2b
 521
 522 #define HSCALELOW_REG   0x30
 523 #define HSCALEHIGH_REG  0x31
 524 #define VSCALELOW_REG   0x32
 525 #define VSCALEHIGH_REG  0x33
 526
 527 #define AC97LSB_REG     0x40
 528 #define AC97MSB_REG     0x41
 529 #define AC97ADDR_REG    0x42
 530 #define AC97BUSY_REG    0x43
 531
 532 /* em202 registers */
 533 #define MASTER_AC97     0x02
 534 #define LINE_IN_AC97    0x10
 535 #define VIDEO_AC97      0x14
 536
 537 /* register settings */
 538 #define EM2800_AUDIO_SRC_TUNER  0x0d
 539 #define EM2800_AUDIO_SRC_LINE   0x0c
 540 #define EM28XX_AUDIO_SRC_TUNER  0xc0
 541 #define EM28XX_AUDIO_SRC_LINE   0x80
 542
 543 /* printk macros */
 544
 545 #define em28xx_err(fmt, arg...) do {\
 546         printk(KERN_ERR fmt , ##arg); } while (0)
 547
 548 #define em28xx_errdev(fmt, arg...) do {\
 549         printk(KERN_ERR "%s: "fmt,\
 550                         dev->name , ##arg); } while (0)
 551
 552 #define em28xx_info(fmt, arg...) do {\
 553         printk(KERN_INFO "%s: "fmt,\
 554                         dev->name , ##arg); } while (0)
 555 #define em28xx_warn(fmt, arg...) do {\
 556         printk(KERN_WARNING "%s: "fmt,\
 557                         dev->name , ##arg); } while (0)
 558
 559 inline static int em28xx_compression_disable(struct em28xx *dev)
 560 {
 561         /* side effect of disabling scaler and mixer */
 562         return em28xx_write_regs(dev, COMPR_REG, "\x00", 1);
 563 }
 564
 565 inline static int em28xx_contrast_get(struct em28xx *dev)
 566 {
 567         return em28xx_read_reg(dev, YGAIN_REG) & 0x1f;
 568 }
 569
 570 inline static int em28xx_brightness_get(struct em28xx *dev)
 571 {
 572         return em28xx_read_reg(dev, YOFFSET_REG);
 573 }
 574
 575 inline static int em28xx_saturation_get(struct em28xx *dev)
 576 {
 577         return em28xx_read_reg(dev, UVGAIN_REG) & 0x1f;
 578 }
 579
 580 inline static int em28xx_u_balance_get(struct em28xx *dev)
 581 {
 582         return em28xx_read_reg(dev, UOFFSET_REG);
 583 }
 584
 585 inline static int em28xx_v_balance_get(struct em28xx *dev)
 586 {
 587         return em28xx_read_reg(dev, VOFFSET_REG);
 588 }
 589
 590 inline static int em28xx_gamma_get(struct em28xx *dev)
 591 {
 592         return em28xx_read_reg(dev, GAMMA_REG) & 0x3f;
 593 }
 594
 595 inline static int em28xx_contrast_set(struct em28xx *dev, s32 val)
 596 {
 597         u8 tmp = (u8) val;
 598         return em28xx_write_regs(dev, YGAIN_REG, &tmp, 1);
 599 }
 600
 601 inline static int em28xx_brightness_set(struct em28xx *dev, s32 val)
 602 {
 603         u8 tmp = (u8) val;
 604         return em28xx_write_regs(dev, YOFFSET_REG, &tmp, 1);
 605 }
 606
 607 inline static int em28xx_saturation_set(struct em28xx *dev, s32 val)
 608 {
 609         u8 tmp = (u8) val;
 610         return em28xx_write_regs(dev, UVGAIN_REG, &tmp, 1);
 611 }
 612
 613 inline static int em28xx_u_balance_set(struct em28xx *dev, s32 val)
 614 {
 615         u8 tmp = (u8) val;
 616         return em28xx_write_regs(dev, UOFFSET_REG, &tmp, 1);
 617 }
 618
 619 inline static int em28xx_v_balance_set(struct em28xx *dev, s32 val)
 620 {
 621         u8 tmp = (u8) val;
 622         return em28xx_write_regs(dev, VOFFSET_REG, &tmp, 1);
 623 }
 624
 625 inline static int em28xx_gamma_set(struct em28xx *dev, s32 val)
 626 {
 627         u8 tmp = (u8) val;
 628         return em28xx_write_regs(dev, GAMMA_REG, &tmp, 1);
 629 }
 630
 631 /*FIXME: maxw should be dependent of alt mode */
 632 inline static unsigned int norm_maxw(struct em28xx *dev)
 633 {
 634         if (dev->max_range_640_480)
 635                 return 640;
 636         else
 637                 return 720;
 638 }
 639
 640 inline static unsigned int norm_maxh(struct em28xx *dev)
 641 {
 642         if (dev->max_range_640_480)
 643                 return 480;
 644         else
 645                 return (dev->norm & V4L2_STD_625_50) ? 576 : 480;
 646 }
 647 #endif