em28xx.h

/*
   em28xx.h - driver for Empia EM2800/EM2820/2840 USB video capture devices

   Copyright (C) 2005 Markus Rechberger <mrechberger@gmail.com>
		      Ludovico Cavedon <cavedon@sssup.it>
		      Mauro Carvalho Chehab <mchehab@infradead.org>

   Based on the em2800 driver from Sascha Sommer <saschasommer@freenet.de>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef _EM28XX_H
#define _EM28XX_H

#include <linux/videodev2.h>
#include <media/videobuf-vmalloc.h>

#include <linux/i2c.h>
#include <linux/mutex.h>
#include <media/ir-kbd-i2c.h>
#if defined(CONFIG_VIDEO_EM28XX_DVB) || defined(CONFIG_VIDEO_EM28XX_DVB_MODULE)
#include <media/videobuf-dvb.h>
#endif
#include "tuner-xc2028.h"
#include "em28xx-reg.h"

/* Boards supported by driver */
#define EM2800_BOARD_UNKNOWN			0
#define EM2820_BOARD_UNKNOWN			1
#define EM2820_BOARD_TERRATEC_CINERGY_250	2
#define EM2820_BOARD_PINNACLE_USB_2		3
#define EM2820_BOARD_HAUPPAUGE_WINTV_USB_2      4
#define EM2820_BOARD_MSI_VOX_USB_2              5
#define EM2800_BOARD_TERRATEC_CINERGY_200       6
#define EM2800_BOARD_LEADTEK_WINFAST_USBII      7
#define EM2800_BOARD_KWORLD_USB2800             8
#define EM2820_BOARD_PINNACLE_DVC_90		9
#define EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900	10
#define EM2880_BOARD_TERRATEC_HYBRID_XS		11
#define EM2820_BOARD_KWORLD_PVRTV2800RF		12
#define EM2880_BOARD_TERRATEC_PRODIGY_XS	13
#define EM2820_BOARD_PROLINK_PLAYTV_USB2	14
#define EM2800_BOARD_VGEAR_POCKETTV             15
#define EM2883_BOARD_HAUPPAUGE_WINTV_HVR_950	16
#define EM2880_BOARD_PINNACLE_PCTV_HD_PRO	17
#define EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900_R2	18
#define EM2860_BOARD_POINTNIX_INTRAORAL_CAMERA  19
#define EM2880_BOARD_AMD_ATI_TV_WONDER_HD_600   20
#define EM2800_BOARD_GRABBEEX_USB2800           21
#define EM2750_BOARD_UNKNOWN			  22
#define EM2750_BOARD_DLCW_130			  23
#define EM2820_BOARD_DLINK_USB_TV		  24
#define EM2820_BOARD_GADMEI_UTV310		  25
#define EM2820_BOARD_HERCULES_SMART_TV_USB2	  26
#define EM2820_BOARD_PINNACLE_USB_2_FM1216ME	  27
#define EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE 28
#define EM2820_BOARD_VIDEOLOGY_20K14XUSB	  30
#define EM2821_BOARD_USBGEAR_VD204		  31
#define EM2821_BOARD_SUPERCOMP_USB_2		  32
#define EM2821_BOARD_PROLINK_PLAYTV_USB2	  33
#define EM2860_BOARD_TERRATEC_HYBRID_XS		  34
#define EM2860_BOARD_TYPHOON_DVD_MAKER		  35
#define EM2860_BOARD_NETGMBH_CAM		  36
#define EM2860_BOARD_GADMEI_UTV330		  37
#define EM2861_BOARD_YAKUMO_MOVIE_MIXER		  38
#define EM2861_BOARD_KWORLD_PVRTV_300U		  39
#define EM2861_BOARD_PLEXTOR_PX_TV100U		  40
#define EM2870_BOARD_KWORLD_350U		  41
#define EM2870_BOARD_KWORLD_355U		  42
#define EM2870_BOARD_TERRATEC_XS		  43
#define EM2870_BOARD_TERRATEC_XS_MT2060		  44
#define EM2870_BOARD_PINNACLE_PCTV_DVB		  45
#define EM2870_BOARD_COMPRO_VIDEOMATE		  46
#define EM2880_BOARD_KWORLD_DVB_305U		  47
#define EM2880_BOARD_KWORLD_DVB_310U		  48
#define EM2880_BOARD_MSI_DIGIVOX_AD		  49
#define EM2880_BOARD_MSI_DIGIVOX_AD_II		  50
#define EM2880_BOARD_TERRATEC_HYBRID_XS_FR	  51
#define EM2881_BOARD_DNT_DA2_HYBRID		  52
#define EM2881_BOARD_PINNACLE_HYBRID_PRO	  53
#define EM2882_BOARD_KWORLD_VS_DVBT		  54
#define EM2882_BOARD_TERRATEC_HYBRID_XS		  55
#define EM2882_BOARD_PINNACLE_HYBRID_PRO	  56
#define EM2883_BOARD_KWORLD_HYBRID_330U                  57
#define EM2820_BOARD_COMPRO_VIDEOMATE_FORYOU	  58
#define EM2883_BOARD_HAUPPAUGE_WINTV_HVR_850	  60
#define EM2820_BOARD_PROLINK_PLAYTV_BOX4_USB2	  61
#define EM2820_BOARD_GADMEI_TVR200		  62
#define EM2860_BOARD_KAIOMY_TVNPC_U2              63
#define EM2860_BOARD_EASYCAP                      64

/* Limits minimum and default number of buffers */
#define EM28XX_MIN_BUF 4
#define EM28XX_DEF_BUF 8

/*Limits the max URB message size */
#define URB_MAX_CTRL_SIZE 80

/* Params for validated field */
#define EM28XX_BOARD_NOT_VALIDATED 1
#define EM28XX_BOARD_VALIDATED	   0

/* Params for em28xx_cmd() audio */
#define EM28XX_START_AUDIO      1
#define EM28XX_STOP_AUDIO       0

/* maximum number of em28xx boards */
#define EM28XX_MAXBOARDS 4 /*FIXME: should be bigger */

/* maximum number of frames that can be queued */
#define EM28XX_NUM_FRAMES 5
/* number of frames that get used for v4l2_read() */
#define EM28XX_NUM_READ_FRAMES 2

/* number of buffers for isoc transfers */
#define EM28XX_NUM_BUFS 5

/* number of packets for each buffer
   windows requests only 40 packets .. so we better do the same
   this is what I found out for all alternate numbers there!
 */
#define EM28XX_NUM_PACKETS 40

/* default alternate; 0 means choose the best */
#define EM28XX_PINOUT 0

#define EM28XX_INTERLACED_DEFAULT 1

/*
#define (use usbview if you want to get the other alternate number infos)
#define
#define alternate number 2
#define 			Endpoint Address: 82
			Direction: in
			Attribute: 1
			Type: Isoc
			Max Packet Size: 1448
			Interval: 125us

  alternate number 7

			Endpoint Address: 82
			Direction: in
			Attribute: 1
			Type: Isoc
			Max Packet Size: 3072
			Interval: 125us
*/

/* time to wait when stopping the isoc transfer */
#define EM28XX_URB_TIMEOUT \
			msecs_to_jiffies(EM28XX_NUM_BUFS * EM28XX_NUM_PACKETS)

/* time in msecs to wait for i2c writes to finish */
#define EM2800_I2C_WRITE_TIMEOUT 20

enum em28xx_mode {
	EM28XX_SUSPEND,
	EM28XX_ANALOG_MODE,
	EM28XX_DIGITAL_MODE,
};

enum em28xx_stream_state {
	STREAM_OFF,
	STREAM_INTERRUPT,
	STREAM_ON,
};

struct em28xx;

struct em28xx_usb_isoc_ctl {
		/* max packet size of isoc transaction */
	int				max_pkt_size;

		/* number of allocated urbs */
	int				num_bufs;

		/* urb for isoc transfers */
	struct urb			**urb;

		/* transfer buffers for isoc transfer */
	char				**transfer_buffer;

		/* Last buffer command and region */
	u8				cmd;
	int				pos, size, pktsize;

		/* Last field: ODD or EVEN? */
	int				field;

		/* Stores incomplete commands */
	u32				tmp_buf;
	int				tmp_buf_len;

		/* Stores already requested buffers */
	struct em28xx_buffer    	*buf;

		/* Stores the number of received fields */
	int				nfields;

		/* isoc urb callback */
	int (*isoc_copy) (struct em28xx *dev, struct urb *urb);

};

/* Struct to enumberate video formats */
struct em28xx_fmt {
	char  *name;
	u32   fourcc;          /* v4l2 format id */
	int   depth;
	int   reg;
};

/* buffer for one video frame */
struct em28xx_buffer {
	/* common v4l buffer stuff -- must be first */
	struct videobuf_buffer vb;

	struct list_head frame;
	int top_field;
	int receiving;
};

struct em28xx_dmaqueue {
	struct list_head       active;
	struct list_head       queued;

	wait_queue_head_t          wq;

	/* Counters to control buffer fill */
	int                        pos;
};

/* io methods */
enum em28xx_io_method {
	IO_NONE,
	IO_READ,
	IO_MMAP,
};

/* inputs */

#define MAX_EM28XX_INPUT 4
enum enum28xx_itype {
	EM28XX_VMUX_COMPOSITE1 = 1,
	EM28XX_VMUX_COMPOSITE2,
	EM28XX_VMUX_COMPOSITE3,
	EM28XX_VMUX_COMPOSITE4,
	EM28XX_VMUX_SVIDEO,
	EM28XX_VMUX_TELEVISION,
	EM28XX_VMUX_CABLE,
	EM28XX_VMUX_DVB,
	EM28XX_VMUX_DEBUG,
	EM28XX_RADIO,
};

enum em28xx_ac97_mode {
	EM28XX_NO_AC97 = 0,
	EM28XX_AC97_EM202,
	EM28XX_AC97_SIGMATEL,
	EM28XX_AC97_OTHER,
};

struct em28xx_audio_mode {
	enum em28xx_ac97_mode ac97;

	u16 ac97_feat;
	u32 ac97_vendor_id;

	unsigned int has_audio:1;

	unsigned int i2s_3rates:1;
	unsigned int i2s_5rates:1;
};

/* em28xx has two audio inputs: tuner and line in.
   However, on most devices, an auxiliary AC97 codec device is used.
   The AC97 device may have several different inputs and outputs,
   depending on their model. So, it is possible to use AC97 mixer to
   address more than two different entries.
 */
enum em28xx_amux {
	/* This is the only entry for em28xx tuner input */
	EM28XX_AMUX_VIDEO,	/* em28xx tuner, AC97 mixer Video */

	EM28XX_AMUX_LINE_IN,	/* AC97 mixer Line In */

	/* Some less-common mixer setups */
	EM28XX_AMUX_VIDEO2,	/* em28xx Line in, AC97 mixer Video */
	EM28XX_AMUX_PHONE,
	EM28XX_AMUX_MIC,
	EM28XX_AMUX_CD,
	EM28XX_AMUX_AUX,
	EM28XX_AMUX_PCM_OUT,
};

enum em28xx_aout {
	/* AC97 outputs */
	EM28XX_AOUT_MASTER = 1 << 0,
	EM28XX_AOUT_LINE   = 1 << 1,
	EM28XX_AOUT_MONO   = 1 << 2,
	EM28XX_AOUT_LFE    = 1 << 3,
	EM28XX_AOUT_SURR   = 1 << 4,

	/* PCM IN Mixer - used by AC97_RECORD_SELECT register */
	EM28XX_AOUT_PCM_IN = 1 << 7,

	/* Bits 10-8 are used to indicate the PCM IN record select */
	EM28XX_AOUT_PCM_MIC_PCM = 0 << 8,
	EM28XX_AOUT_PCM_CD	= 1 << 8,
	EM28XX_AOUT_PCM_VIDEO	= 2 << 8,
	EM28XX_AOUT_PCM_AUX	= 3 << 8,
	EM28XX_AOUT_PCM_LINE	= 4 << 8,
	EM28XX_AOUT_PCM_STEREO	= 5 << 8,
	EM28XX_AOUT_PCM_MONO	= 6 << 8,
	EM28XX_AOUT_PCM_PHONE	= 7 << 8,
};

static inline int ac97_return_record_select(int a_out)
{
	return (a_out & 0x700) >> 8;
}

struct em28xx_reg_seq {
	int reg;
	unsigned char val, mask;
	int sleep;
};

struct em28xx_input {
	enum enum28xx_itype type;
	unsigned int vmux;
	enum em28xx_amux amux;
	enum em28xx_aout aout;
	struct em28xx_reg_seq *gpio;
};

#define INPUT(nr) (&em28xx_boards[dev->model].input[nr])

enum em28xx_decoder {
	EM28XX_NODECODER,
	EM28XX_TVP5150,
	EM28XX_SAA711X,
};

struct em28xx_board {
	char *name;
	int vchannels;
	int tuner_type;
	int tuner_addr;

	/* i2c flags */
	unsigned int tda9887_conf;

	/* GPIO sequences */
	struct em28xx_reg_seq *dvb_gpio;
	struct em28xx_reg_seq *suspend_gpio;
	struct em28xx_reg_seq *tuner_gpio;

	unsigned int is_em2800:1;
	unsigned int has_msp34xx:1;
	unsigned int mts_firmware:1;
	unsigned int max_range_640_480:1;
	unsigned int has_dvb:1;
	unsigned int has_snapshot_button:1;
	unsigned int valid:1;

	unsigned char xclk, i2c_speed;

	enum em28xx_decoder decoder;

	struct em28xx_input       input[MAX_EM28XX_INPUT];
	struct em28xx_input	  radio;
	IR_KEYTAB_TYPE            *ir_codes;
};

struct em28xx_eeprom {
	u32 id;			/* 0x9567eb1a */
	u16 vendor_ID;
	u16 product_ID;

	u16 chip_conf;

	u16 board_conf;

	u16 string1, string2, string3;

	u8 string_idx_table;
};

/* device states */
enum em28xx_dev_state {
	DEV_INITIALIZED = 0x01,
	DEV_DISCONNECTED = 0x02,
	DEV_MISCONFIGURED = 0x04,
};

#define EM28XX_AUDIO_BUFS 5
#define EM28XX_NUM_AUDIO_PACKETS 64
#define EM28XX_AUDIO_MAX_PACKET_SIZE 196 /* static value */
#define EM28XX_CAPTURE_STREAM_EN 1

/* em28xx extensions */
#define EM28XX_AUDIO   0x10
#define EM28XX_DVB     0x20

struct em28xx_audio {
	char name[50];
	char *transfer_buffer[EM28XX_AUDIO_BUFS];
	struct urb *urb[EM28XX_AUDIO_BUFS];
	struct usb_device *udev;
	unsigned int capture_transfer_done;
	struct snd_pcm_substream   *capture_pcm_substream;

	unsigned int hwptr_done_capture;
	struct snd_card            *sndcard;

	int users;
	enum em28xx_stream_state capture_stream;
	spinlock_t slock;
};

struct em28xx;

struct em28xx_fh {
	struct em28xx *dev;
	unsigned int  stream_on:1;	/* Locks streams */
	int           radio;

	struct videobuf_queue        vb_vidq;

	enum v4l2_buf_type           type;
};

/* main device struct */
struct em28xx {
	/* generic device properties */
	char name[30];		/* name (including minor) of the device */
	int model;		/* index in the device_data struct */
	int devno;		/* marks the number of this device */
	enum em28xx_chip_id chip_id;

	struct em28xx_board board;

	unsigned int stream_on:1;	/* Locks streams */
	unsigned int has_audio_class:1;
	unsigned int has_alsa_audio:1;

	struct em28xx_fmt *format;

	struct em28xx_IR *ir;

	/* Some older em28xx chips needs a waiting time after writing */
	unsigned int wait_after_write;

	struct list_head	devlist;

	u32 i2s_speed;		/* I2S speed for audio digital stream */

	struct em28xx_audio_mode audio_mode;

	int tuner_type;		/* type of the tuner */
	int tuner_addr;		/* tuner address */
	int tda9887_conf;
	/* i2c i/o */
	struct i2c_adapter i2c_adap;
	struct i2c_client i2c_client;
	/* video for linux */
	int users;		/* user count for exclusive use */
	struct video_device *vdev;	/* video for linux device struct */
	v4l2_std_id norm;	/* selected tv norm */
	int ctl_freq;		/* selected frequency */
	unsigned int ctl_input;	/* selected input */
	unsigned int ctl_ainput;/* selected audio input */
	unsigned int ctl_aoutput;/* selected audio output */
	int mute;
	int volume;
	/* frame properties */
	int width;		/* current frame width */
	int height;		/* current frame height */
	unsigned hscale;	/* horizontal scale factor (see datasheet) */
	unsigned vscale;	/* vertical scale factor (see datasheet) */
	int interlaced;		/* 1=interlace fileds, 0=just top fileds */
	unsigned int video_bytesread;	/* Number of bytes read */

	unsigned long hash;	/* eeprom hash - for boards with generic ID */
	unsigned long i2c_hash;	/* i2c devicelist hash -
				   for boards with generic ID */

	struct em28xx_audio adev;

	/* states */
	enum em28xx_dev_state state;
	enum em28xx_io_method io;

	struct work_struct         request_module_wk;

	/* locks */
	struct mutex lock;
	struct mutex ctrl_urb_lock;	/* protects urb_buf */
	/* spinlock_t queue_lock; */
	struct list_head inqueue, outqueue;
	wait_queue_head_t open, wait_frame, wait_stream;
	struct video_device *vbi_dev;
	struct video_device *radio_dev;

	unsigned char eedata[256];

	/* Isoc control struct */
	struct em28xx_dmaqueue vidq;
	struct em28xx_usb_isoc_ctl isoc_ctl;
	spinlock_t slock;

	/* usb transfer */
	struct usb_device *udev;	/* the usb device */
	int alt;		/* alternate */
	int max_pkt_size;	/* max packet size of isoc transaction */
	int num_alt;		/* Number of alternative settings */
	unsigned int *alt_max_pkt_size;	/* array of wMaxPacketSize */
	struct urb *urb[EM28XX_NUM_BUFS];	/* urb for isoc transfers */
	char *transfer_buffer[EM28XX_NUM_BUFS];	/* transfer buffers for isoc
						   transfer */
	char urb_buf[URB_MAX_CTRL_SIZE];	/* urb control msg buffer */

	/* helper funcs that call usb_control_msg */
	int (*em28xx_write_regs) (struct em28xx *dev, u16 reg,
					char *buf, int len);
	int (*em28xx_read_reg) (struct em28xx *dev, u16 reg);
	int (*em28xx_read_reg_req_len) (struct em28xx *dev, u8 req, u16 reg,
					char *buf, int len);
	int (*em28xx_write_regs_req) (struct em28xx *dev, u8 req, u16 reg,
				      char *buf, int len);
	int (*em28xx_read_reg_req) (struct em28xx *dev, u8 req, u16 reg);

	enum em28xx_mode mode;

	/* register numbers for GPO/GPIO registers */
	u16 reg_gpo_num, reg_gpio_num;

	/* Caches GPO and GPIO registers */
	unsigned char	reg_gpo, reg_gpio;

	/* Snapshot button */
	char snapshot_button_path[30];	/* path of the input dev */
	struct input_dev *sbutton_input_dev;
	struct delayed_work sbutton_query_work;

	struct em28xx_dvb *dvb;
};

struct em28xx_ops {
	struct list_head next;
	char *name;
	int id;
	int (*init)(struct em28xx *);
	int (*fini)(struct em28xx *);
};

/* Provided by em28xx-i2c.c */

void em28xx_i2c_call_clients(struct em28xx *dev, unsigned int cmd, void *arg);
void em28xx_do_i2c_scan(struct em28xx *dev);
int em28xx_i2c_register(struct em28xx *dev);
int em28xx_i2c_unregister(struct em28xx *dev);

/* Provided by em28xx-core.c */

u32 em28xx_request_buffers(struct em28xx *dev, u32 count);
void em28xx_queue_unusedframes(struct em28xx *dev);
void em28xx_release_buffers(struct em28xx *dev);

int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
			    char *buf, int len);
int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg);
int em28xx_read_reg(struct em28xx *dev, u16 reg);
int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
			  int len);
int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len);
int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val);

int em28xx_read_ac97(struct em28xx *dev, u8 reg);
int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val);

int em28xx_audio_analog_set(struct em28xx *dev);
int em28xx_audio_setup(struct em28xx *dev);

int em28xx_colorlevels_set_default(struct em28xx *dev);
int em28xx_capture_start(struct em28xx *dev, int start);
int em28xx_set_outfmt(struct em28xx *dev);
int em28xx_resolution_set(struct em28xx *dev);
int em28xx_set_alternate(struct em28xx *dev);
int em28xx_init_isoc(struct em28xx *dev, int max_packets,
		     int num_bufs, int max_pkt_size,
		     int (*isoc_copy) (struct em28xx *dev, struct urb *urb));
void em28xx_uninit_isoc(struct em28xx *dev);
int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode);
int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio);
void em28xx_wake_i2c(struct em28xx *dev);
void em28xx_remove_from_devlist(struct em28xx *dev);
void em28xx_add_into_devlist(struct em28xx *dev);
struct em28xx *em28xx_get_device(int minor,
				 enum v4l2_buf_type *fh_type,
				 int *has_radio);
int em28xx_register_extension(struct em28xx_ops *dev);
void em28xx_unregister_extension(struct em28xx_ops *dev);
void em28xx_init_extension(struct em28xx *dev);
void em28xx_close_extension(struct em28xx *dev);

/* Provided by em28xx-video.c */
int em28xx_register_analog_devices(struct em28xx *dev);
void em28xx_release_analog_resources(struct em28xx *dev);

/* Provided by em28xx-cards.c */
extern int em2800_variant_detect(struct usb_device *udev, int model);
extern void em28xx_pre_card_setup(struct em28xx *dev);
extern void em28xx_card_setup(struct em28xx *dev);
extern struct em28xx_board em28xx_boards[];
extern struct usb_device_id em28xx_id_table[];
extern const unsigned int em28xx_bcount;
void em28xx_set_ir(struct em28xx *dev, struct IR_i2c *ir);
int em28xx_tuner_callback(void *ptr, int component, int command, int arg);
void em28xx_release_resources(struct em28xx *dev);

/* Provided by em28xx-input.c */
int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw);
int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw);
int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
				     u32 *ir_raw);
void em28xx_register_snapshot_button(struct em28xx *dev);
void em28xx_deregister_snapshot_button(struct em28xx *dev);

int em28xx_ir_init(struct em28xx *dev);
int em28xx_ir_fini(struct em28xx *dev);

/* printk macros */

#define em28xx_err(fmt, arg...) do {\
	printk(KERN_ERR fmt , ##arg); } while (0)

#define em28xx_errdev(fmt, arg...) do {\
	printk(KERN_ERR "%s: "fmt,\
			dev->name , ##arg); } while (0)

#define em28xx_info(fmt, arg...) do {\
	printk(KERN_INFO "%s: "fmt,\
			dev->name , ##arg); } while (0)
#define em28xx_warn(fmt, arg...) do {\
	printk(KERN_WARNING "%s: "fmt,\
			dev->name , ##arg); } while (0)

static inline int em28xx_compression_disable(struct em28xx *dev)
{
	/* side effect of disabling scaler and mixer */
	return em28xx_write_reg(dev, EM28XX_R26_COMPR, 0x00);
}

static inline int em28xx_contrast_get(struct em28xx *dev)
{
	return em28xx_read_reg(dev, EM28XX_R20_YGAIN) & 0x1f;
}

static inline int em28xx_brightness_get(struct em28xx *dev)
{
	return em28xx_read_reg(dev, EM28XX_R21_YOFFSET);
}

static inline int em28xx_saturation_get(struct em28xx *dev)
{
	return em28xx_read_reg(dev, EM28XX_R22_UVGAIN) & 0x1f;
}

static inline int em28xx_u_balance_get(struct em28xx *dev)
{
	return em28xx_read_reg(dev, EM28XX_R23_UOFFSET);
}

static inline int em28xx_v_balance_get(struct em28xx *dev)
{
	return em28xx_read_reg(dev, EM28XX_R24_VOFFSET);
}

static inline int em28xx_gamma_get(struct em28xx *dev)
{
	return em28xx_read_reg(dev, EM28XX_R14_GAMMA) & 0x3f;
}

static inline int em28xx_contrast_set(struct em28xx *dev, s32 val)
{
	u8 tmp = (u8) val;
	return em28xx_write_regs(dev, EM28XX_R20_YGAIN, &tmp, 1);
}

static inline int em28xx_brightness_set(struct em28xx *dev, s32 val)
{
	u8 tmp = (u8) val;
	return em28xx_write_regs(dev, EM28XX_R21_YOFFSET, &tmp, 1);
}

static inline int em28xx_saturation_set(struct em28xx *dev, s32 val)
{
	u8 tmp = (u8) val;
	return em28xx_write_regs(dev, EM28XX_R22_UVGAIN, &tmp, 1);
}

static inline int em28xx_u_balance_set(struct em28xx *dev, s32 val)
{
	u8 tmp = (u8) val;
	return em28xx_write_regs(dev, EM28XX_R23_UOFFSET, &tmp, 1);
}

static inline int em28xx_v_balance_set(struct em28xx *dev, s32 val)
{
	u8 tmp = (u8) val;
	return em28xx_write_regs(dev, EM28XX_R24_VOFFSET, &tmp, 1);
}

static inline int em28xx_gamma_set(struct em28xx *dev, s32 val)
{
	u8 tmp = (u8) val;
	return em28xx_write_regs(dev, EM28XX_R14_GAMMA, &tmp, 1);
}

/*FIXME: maxw should be dependent of alt mode */
static inline unsigned int norm_maxw(struct em28xx *dev)
{
	if (dev->board.max_range_640_480)
		return 640;
	else
		return 720;
}

static inline unsigned int norm_maxh(struct em28xx *dev)
{
	if (dev->board.max_range_640_480)
		return 480;
	else
		return (dev->norm & V4L2_STD_625_50) ? 576 : 480;
}
#endif