/*
   *  saa7191.c - Philips SAA7191 video decoder driver
   *
   *  Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
   *  Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License version 2 as
   *  published by the Free Software Foundation.
   */
  
  #include <linux/delay.h>
  #include <linux/errno.h>
  #include <linux/fs.h>
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/major.h>
  #include <linux/module.h>
  #include <linux/mm.h>
  #include <linux/slab.h>
  
  #include <linux/videodev2.h>
  #include <linux/i2c.h>
  #include <media/v4l2-device.h>
  
  #include "saa7191.h"
  
  #define SAA7191_MODULE_VERSION	"0.0.5"
  
  MODULE_DESCRIPTION("Philips SAA7191 video decoder driver");
  MODULE_VERSION(SAA7191_MODULE_VERSION);
  MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
  MODULE_LICENSE("GPL");
  
  
  // #define SAA7191_DEBUG
  
  #ifdef SAA7191_DEBUG
  #define dprintk(x...) printk("SAA7191: " x);
  #else
  #define dprintk(x...)
  #endif
  
  #define SAA7191_SYNC_COUNT	30
  #define SAA7191_SYNC_DELAY	100	/* milliseconds */
  
  struct saa7191 {
  	struct v4l2_subdev sd;
  
  	/* the register values are stored here as the actual
  	 * I2C-registers are write-only */
  	u8 reg[25];
  
  	int input;
  	v4l2_std_id norm;
  };
  
  static inline struct saa7191 *to_saa7191(struct v4l2_subdev *sd)
  {
  	return container_of(sd, struct saa7191, sd);
  }
  
  static const u8 initseq[] = {
  	0,	/* Subaddress */
  
  	0x50,	/* (0x50) SAA7191_REG_IDEL */
  
  	/* 50 Hz signal timing */
  	0x30,	/* (0x30) SAA7191_REG_HSYB */
  	0x00,	/* (0x00) SAA7191_REG_HSYS */
  	0xe8,	/* (0xe8) SAA7191_REG_HCLB */
  	0xb6,	/* (0xb6) SAA7191_REG_HCLS */
  	0xf4,	/* (0xf4) SAA7191_REG_HPHI */
  
  	/* control */
  	SAA7191_LUMA_APER_1,	/* (0x01) SAA7191_REG_LUMA - CVBS mode */
  	0x00,	/* (0x00) SAA7191_REG_HUEC */
  	0xf8,	/* (0xf8) SAA7191_REG_CKTQ */
  	0xf8,	/* (0xf8) SAA7191_REG_CKTS */
  	0x90,	/* (0x90) SAA7191_REG_PLSE */
  	0x90,	/* (0x90) SAA7191_REG_SESE */
  	0x00,	/* (0x00) SAA7191_REG_GAIN */
  	SAA7191_STDC_NFEN | SAA7191_STDC_HRMV,	/* (0x0c) SAA7191_REG_STDC
  						 * - not SECAM,
  						 * slow time constant */
  	SAA7191_IOCK_OEDC | SAA7191_IOCK_OEHS | SAA7191_IOCK_OEVS
  	| SAA7191_IOCK_OEDY,	/* (0x78) SAA7191_REG_IOCK
  				 * - chroma from CVBS, GPSW1 & 2 off */
  	SAA7191_CTL3_AUFD | SAA7191_CTL3_SCEN | SAA7191_CTL3_OFTS
  	| SAA7191_CTL3_YDEL0,	/* (0x99) SAA7191_REG_CTL3
  				 * - automatic field detection */
  	0x00,	/* (0x00) SAA7191_REG_CTL4 */
  	0x2c,	/* (0x2c) SAA7191_REG_CHCV - PAL nominal value */
  	0x00,	/* unused */
  	0x00,	/* unused */
  
  	/* 60 Hz signal timing */
  	0x34,	/* (0x34) SAA7191_REG_HS6B */
  	0x0a,	/* (0x0a) SAA7191_REG_HS6S */
  	0xf4,	/* (0xf4) SAA7191_REG_HC6B */
  	0xce,	/* (0xce) SAA7191_REG_HC6S */
  	0xf4,	/* (0xf4) SAA7191_REG_HP6I */
  };
  
  /* SAA7191 register handling */
  
  static u8 saa7191_read_reg(struct v4l2_subdev *sd, u8 reg)
  {
  	return to_saa7191(sd)->reg[reg];
  }
  
  static int saa7191_read_status(struct v4l2_subdev *sd, u8 *value)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(sd);
  	int ret;
  
  	ret = i2c_master_recv(client, value, 1);
  	if (ret < 0) {
  		printk(KERN_ERR "SAA7191: saa7191_read_status(): read failed
  ");
  		return ret;
  	}
  
  	return 0;
  }
  
  
  static int saa7191_write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(sd);
  
  	to_saa7191(sd)->reg[reg] = value;
  	return i2c_smbus_write_byte_data(client, reg, value);
  }
  
  /* the first byte of data must be the first subaddress number (register) */
  static int saa7191_write_block(struct v4l2_subdev *sd,
  			       u8 length, const u8 *data)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(sd);
  	struct saa7191 *decoder = to_saa7191(sd);
  	int i;
  	int ret;
  
  	for (i = 0; i < (length - 1); i++) {
  		decoder->reg[data[0] + i] = data[i + 1];
  	}
  
  	ret = i2c_master_send(client, data, length);
  	if (ret < 0) {
  		printk(KERN_ERR "SAA7191: saa7191_write_block(): "
  		       "write failed
  ");
  		return ret;
  	}
  
  	return 0;
  }
  
  /* Helper functions */
  
  static int saa7191_s_routing(struct v4l2_subdev *sd,
  			     u32 input, u32 output, u32 config)
  {
  	struct saa7191 *decoder = to_saa7191(sd);
  	u8 luma = saa7191_read_reg(sd, SAA7191_REG_LUMA);
  	u8 iock = saa7191_read_reg(sd, SAA7191_REG_IOCK);
  	int err;
  
  	switch (input) {
  	case SAA7191_INPUT_COMPOSITE: /* Set Composite input */
  		iock &= ~(SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW1
  			  | SAA7191_IOCK_GPSW2);
  		/* Chrominance trap active */
  		luma &= ~SAA7191_LUMA_BYPS;
  		break;
  	case SAA7191_INPUT_SVIDEO: /* Set S-Video input */
  		iock |= SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW2;
  		/* Chrominance trap bypassed */
  		luma |= SAA7191_LUMA_BYPS;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	err = saa7191_write_reg(sd, SAA7191_REG_LUMA, luma);
  	if (err)
  		return -EIO;
  	err = saa7191_write_reg(sd, SAA7191_REG_IOCK, iock);
  	if (err)
  		return -EIO;
  
  	decoder->input = input;
  
  	return 0;
  }
  
  static int saa7191_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
  {
  	struct saa7191 *decoder = to_saa7191(sd);
  	u8 stdc = saa7191_read_reg(sd, SAA7191_REG_STDC);
  	u8 ctl3 = saa7191_read_reg(sd, SAA7191_REG_CTL3);
  	u8 chcv = saa7191_read_reg(sd, SAA7191_REG_CHCV);
  	int err;
  
  	if (norm & V4L2_STD_PAL) {
  		stdc &= ~SAA7191_STDC_SECS;
  		ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
  		chcv = SAA7191_CHCV_PAL;
  	} else if (norm & V4L2_STD_NTSC) {
  		stdc &= ~SAA7191_STDC_SECS;
  		ctl3 &= ~SAA7191_CTL3_AUFD;
  		ctl3 |= SAA7191_CTL3_FSEL;
  		chcv = SAA7191_CHCV_NTSC;
  	} else if (norm & V4L2_STD_SECAM) {
  		stdc |= SAA7191_STDC_SECS;
  		ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
  		chcv = SAA7191_CHCV_PAL;
  	} else {
  		return -EINVAL;
  	}
  
  	err = saa7191_write_reg(sd, SAA7191_REG_CTL3, ctl3);
  	if (err)
  		return -EIO;
  	err = saa7191_write_reg(sd, SAA7191_REG_STDC, stdc);
  	if (err)
  		return -EIO;
  	err = saa7191_write_reg(sd, SAA7191_REG_CHCV, chcv);
  	if (err)
  		return -EIO;
  
  	decoder->norm = norm;
  
  	dprintk("ctl3: %02x stdc: %02x chcv: %02x
  ", ctl3,
  		stdc, chcv);
  	dprintk("norm: %llx
  ", norm);
  
  	return 0;
  }
  
  static int saa7191_wait_for_signal(struct v4l2_subdev *sd, u8 *status)
  {
  	int i = 0;
  
  	dprintk("Checking for signal...
  ");
  
  	for (i = 0; i < SAA7191_SYNC_COUNT; i++) {
  		if (saa7191_read_status(sd, status))
  			return -EIO;
  
  		if (((*status) & SAA7191_STATUS_HLCK) == 0) {
  			dprintk("Signal found
  ");
  			return 0;
  		}
  
  		msleep(SAA7191_SYNC_DELAY);
  	}
  
  	dprintk("No signal
  ");
  
  	return -EBUSY;
  }
  
  static int saa7191_querystd(struct v4l2_subdev *sd, v4l2_std_id *norm)
  {
  	struct saa7191 *decoder = to_saa7191(sd);
  	u8 stdc = saa7191_read_reg(sd, SAA7191_REG_STDC);
  	u8 ctl3 = saa7191_read_reg(sd, SAA7191_REG_CTL3);
  	u8 status;
  	v4l2_std_id old_norm = decoder->norm;
  	int err = 0;
  
  	dprintk("SAA7191 extended signal auto-detection...
  ");
  
  	*norm &= V4L2_STD_NTSC | V4L2_STD_PAL | V4L2_STD_SECAM;
  	stdc &= ~SAA7191_STDC_SECS;
  	ctl3 &= ~(SAA7191_CTL3_FSEL);
  
  	err = saa7191_write_reg(sd, SAA7191_REG_STDC, stdc);
  	if (err) {
  		err = -EIO;
  		goto out;
  	}
  	err = saa7191_write_reg(sd, SAA7191_REG_CTL3, ctl3);
  	if (err) {
  		err = -EIO;
  		goto out;
  	}
  
  	ctl3 |= SAA7191_CTL3_AUFD;
  	err = saa7191_write_reg(sd, SAA7191_REG_CTL3, ctl3);
  	if (err) {
  		err = -EIO;
  		goto out;
  	}
  
  	msleep(SAA7191_SYNC_DELAY);
  
  	err = saa7191_wait_for_signal(sd, &status);
  	if (err)
  		goto out;
  
  	if (status & SAA7191_STATUS_FIDT) {
  		/* 60Hz signal -> NTSC */
  		dprintk("60Hz signal: NTSC
  ");
  		*norm &= V4L2_STD_NTSC;
  		return 0;
  	}
  
  	/* 50Hz signal */
  	dprintk("50Hz signal: Trying PAL...
  ");
  
  	/* try PAL first */
  	err = saa7191_s_std(sd, V4L2_STD_PAL);
  	if (err)
  		goto out;
  
  	msleep(SAA7191_SYNC_DELAY);
  
  	err = saa7191_wait_for_signal(sd, &status);
  	if (err)
  		goto out;
  
  	/* not 50Hz ? */
  	if (status & SAA7191_STATUS_FIDT) {
  		dprintk("No 50Hz signal
  ");
  		saa7191_s_std(sd, old_norm);
  		*norm = V4L2_STD_UNKNOWN;
  		return 0;
  	}
  
  	if (status & SAA7191_STATUS_CODE) {
  		dprintk("PAL
  ");
  		*norm &= V4L2_STD_PAL;
  		return saa7191_s_std(sd, old_norm);
  	}
  
  	dprintk("No color detected with PAL - Trying SECAM...
  ");
  
  	/* no color detected ? -> try SECAM */
  	err = saa7191_s_std(sd, V4L2_STD_SECAM);
  	if (err)
  		goto out;
  
  	msleep(SAA7191_SYNC_DELAY);
  
  	err = saa7191_wait_for_signal(sd, &status);
  	if (err)
  		goto out;
  
  	/* not 50Hz ? */
  	if (status & SAA7191_STATUS_FIDT) {
  		dprintk("No 50Hz signal
  ");
  		*norm = V4L2_STD_UNKNOWN;
  		goto out;
  	}
  
  	if (status & SAA7191_STATUS_CODE) {
  		/* Color detected -> SECAM */
  		dprintk("SECAM
  ");
  		*norm &= V4L2_STD_SECAM;
  		return saa7191_s_std(sd, old_norm);
  	}
  
  	dprintk("No color detected with SECAM - Going back to PAL.
  ");
  	*norm = V4L2_STD_UNKNOWN;
  
  out:
  	return saa7191_s_std(sd, old_norm);
  }
  
  static int saa7191_autodetect_norm(struct v4l2_subdev *sd)
  {
  	u8 status;
  
  	dprintk("SAA7191 signal auto-detection...
  ");
  
  	dprintk("Reading status...
  ");
  
  	if (saa7191_read_status(sd, &status))
  		return -EIO;
  
  	dprintk("Checking for signal...
  ");
  
  	/* no signal ? */
  	if (status & SAA7191_STATUS_HLCK) {
  		dprintk("No signal
  ");
  		return -EBUSY;
  	}
  
  	dprintk("Signal found
  ");
  
  	if (status & SAA7191_STATUS_FIDT) {
  		/* 60hz signal -> NTSC */
  		dprintk("NTSC
  ");
  		return saa7191_s_std(sd, V4L2_STD_NTSC);
  	} else {
  		/* 50hz signal -> PAL */
  		dprintk("PAL
  ");
  		return saa7191_s_std(sd, V4L2_STD_PAL);
  	}
  }
  
  static int saa7191_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  {
  	u8 reg;
  	int ret = 0;
  
  	switch (ctrl->id) {
  	case SAA7191_CONTROL_BANDPASS:
  	case SAA7191_CONTROL_BANDPASS_WEIGHT:
  	case SAA7191_CONTROL_CORING:
  		reg = saa7191_read_reg(sd, SAA7191_REG_LUMA);
  		switch (ctrl->id) {
  		case SAA7191_CONTROL_BANDPASS:
  			ctrl->value = ((s32)reg & SAA7191_LUMA_BPSS_MASK)
  				>> SAA7191_LUMA_BPSS_SHIFT;
  			break;
  		case SAA7191_CONTROL_BANDPASS_WEIGHT:
  			ctrl->value = ((s32)reg & SAA7191_LUMA_APER_MASK)
  				>> SAA7191_LUMA_APER_SHIFT;
  			break;
  		case SAA7191_CONTROL_CORING:
  			ctrl->value = ((s32)reg & SAA7191_LUMA_CORI_MASK)
  				>> SAA7191_LUMA_CORI_SHIFT;
  			break;
  		}
  		break;
  	case SAA7191_CONTROL_FORCE_COLOUR:
  	case SAA7191_CONTROL_CHROMA_GAIN:
  		reg = saa7191_read_reg(sd, SAA7191_REG_GAIN);
  		if (ctrl->id == SAA7191_CONTROL_FORCE_COLOUR)
  			ctrl->value = ((s32)reg & SAA7191_GAIN_COLO) ? 1 : 0;
  		else
  			ctrl->value = ((s32)reg & SAA7191_GAIN_LFIS_MASK)
  				>> SAA7191_GAIN_LFIS_SHIFT;
  		break;
  	case V4L2_CID_HUE:
  		reg = saa7191_read_reg(sd, SAA7191_REG_HUEC);
  		if (reg < 0x80)
  			reg += 0x80;
  		else
  			reg -= 0x80;
  		ctrl->value = (s32)reg;
  		break;
  	case SAA7191_CONTROL_VTRC:
  		reg = saa7191_read_reg(sd, SAA7191_REG_STDC);
  		ctrl->value = ((s32)reg & SAA7191_STDC_VTRC) ? 1 : 0;
  		break;
  	case SAA7191_CONTROL_LUMA_DELAY:
  		reg = saa7191_read_reg(sd, SAA7191_REG_CTL3);
  		ctrl->value = ((s32)reg & SAA7191_CTL3_YDEL_MASK)
  			>> SAA7191_CTL3_YDEL_SHIFT;
  		if (ctrl->value >= 4)
  			ctrl->value -= 8;
  		break;
  	case SAA7191_CONTROL_VNR:
  		reg = saa7191_read_reg(sd, SAA7191_REG_CTL4);
  		ctrl->value = ((s32)reg & SAA7191_CTL4_VNOI_MASK)
  			>> SAA7191_CTL4_VNOI_SHIFT;
  		break;
  	default:
  		ret = -EINVAL;
  	}
  
  	return ret;
  }
  
  static int saa7191_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  {
  	u8 reg;
  	int ret = 0;
  
  	switch (ctrl->id) {
  	case SAA7191_CONTROL_BANDPASS:
  	case SAA7191_CONTROL_BANDPASS_WEIGHT:
  	case SAA7191_CONTROL_CORING:
  		reg = saa7191_read_reg(sd, SAA7191_REG_LUMA);
  		switch (ctrl->id) {
  		case SAA7191_CONTROL_BANDPASS:
  			reg &= ~SAA7191_LUMA_BPSS_MASK;
  			reg |= (ctrl->value << SAA7191_LUMA_BPSS_SHIFT)
  				& SAA7191_LUMA_BPSS_MASK;
  			break;
  		case SAA7191_CONTROL_BANDPASS_WEIGHT:
  			reg &= ~SAA7191_LUMA_APER_MASK;
  			reg |= (ctrl->value << SAA7191_LUMA_APER_SHIFT)
  				& SAA7191_LUMA_APER_MASK;
  			break;
  		case SAA7191_CONTROL_CORING:
  			reg &= ~SAA7191_LUMA_CORI_MASK;
  			reg |= (ctrl->value << SAA7191_LUMA_CORI_SHIFT)
  				& SAA7191_LUMA_CORI_MASK;
  			break;
  		}
  		ret = saa7191_write_reg(sd, SAA7191_REG_LUMA, reg);
  		break;
  	case SAA7191_CONTROL_FORCE_COLOUR:
  	case SAA7191_CONTROL_CHROMA_GAIN:
  		reg = saa7191_read_reg(sd, SAA7191_REG_GAIN);
  		if (ctrl->id == SAA7191_CONTROL_FORCE_COLOUR) {
  			if (ctrl->value)
  				reg |= SAA7191_GAIN_COLO;
  			else
  				reg &= ~SAA7191_GAIN_COLO;
  		} else {
  			reg &= ~SAA7191_GAIN_LFIS_MASK;
  			reg |= (ctrl->value << SAA7191_GAIN_LFIS_SHIFT)
  				& SAA7191_GAIN_LFIS_MASK;
  		}
  		ret = saa7191_write_reg(sd, SAA7191_REG_GAIN, reg);
  		break;
  	case V4L2_CID_HUE:
  		reg = ctrl->value & 0xff;
  		if (reg < 0x80)
  			reg += 0x80;
  		else
  			reg -= 0x80;
  		ret = saa7191_write_reg(sd, SAA7191_REG_HUEC, reg);
  		break;
  	case SAA7191_CONTROL_VTRC:
  		reg = saa7191_read_reg(sd, SAA7191_REG_STDC);
  		if (ctrl->value)
  			reg |= SAA7191_STDC_VTRC;
  		else
  			reg &= ~SAA7191_STDC_VTRC;
  		ret = saa7191_write_reg(sd, SAA7191_REG_STDC, reg);
  		break;
  	case SAA7191_CONTROL_LUMA_DELAY: {
  		s32 value = ctrl->value;
  		if (value < 0)
  			value += 8;
  		reg = saa7191_read_reg(sd, SAA7191_REG_CTL3);
  		reg &= ~SAA7191_CTL3_YDEL_MASK;
  		reg |= (value << SAA7191_CTL3_YDEL_SHIFT)
  			& SAA7191_CTL3_YDEL_MASK;
  		ret = saa7191_write_reg(sd, SAA7191_REG_CTL3, reg);
  		break;
  	}
  	case SAA7191_CONTROL_VNR:
  		reg = saa7191_read_reg(sd, SAA7191_REG_CTL4);
  		reg &= ~SAA7191_CTL4_VNOI_MASK;
  		reg |= (ctrl->value << SAA7191_CTL4_VNOI_SHIFT)
  			& SAA7191_CTL4_VNOI_MASK;
  		ret = saa7191_write_reg(sd, SAA7191_REG_CTL4, reg);
  		break;
  	default:
  		ret = -EINVAL;
  	}
  
  	return ret;
  }
  
  /* I2C-interface */
  
  static int saa7191_g_input_status(struct v4l2_subdev *sd, u32 *status)
  {
  	u8 status_reg;
  	int res = V4L2_IN_ST_NO_SIGNAL;
  
  	if (saa7191_read_status(sd, &status_reg))
  		return -EIO;
  	if ((status_reg & SAA7191_STATUS_HLCK) == 0)
  		res = 0;
  	if (!(status_reg & SAA7191_STATUS_CODE))
  		res |= V4L2_IN_ST_NO_COLOR;
  	*status = res;
  	return 0;
  }
  
  
  /* ----------------------------------------------------------------------- */
  
  static const struct v4l2_subdev_core_ops saa7191_core_ops = {
  	.g_ctrl = saa7191_g_ctrl,
  	.s_ctrl = saa7191_s_ctrl,
  	.s_std = saa7191_s_std,
  };
  
  static const struct v4l2_subdev_video_ops saa7191_video_ops = {
  	.s_routing = saa7191_s_routing,
  	.querystd = saa7191_querystd,
  	.g_input_status = saa7191_g_input_status,
  };
  
  static const struct v4l2_subdev_ops saa7191_ops = {
  	.core = &saa7191_core_ops,
  	.video = &saa7191_video_ops,
  };
  
  static int saa7191_probe(struct i2c_client *client,
  			  const struct i2c_device_id *id)
  {
  	int err = 0;
  	struct saa7191 *decoder;
  	struct v4l2_subdev *sd;
  
  	v4l_info(client, "chip found @ 0x%x (%s)
  ",
  			client->addr << 1, client->adapter->name);
  
  	decoder = devm_kzalloc(&client->dev, sizeof(*decoder), GFP_KERNEL);
  	if (!decoder)
  		return -ENOMEM;
  
  	sd = &decoder->sd;
  	v4l2_i2c_subdev_init(sd, client, &saa7191_ops);
  
  	err = saa7191_write_block(sd, sizeof(initseq), initseq);
  	if (err) {
  		printk(KERN_ERR "SAA7191 initialization failed
  ");
  		return err;
  	}
  
  	printk(KERN_INFO "SAA7191 initialized
  ");
  
  	decoder->input = SAA7191_INPUT_COMPOSITE;
  	decoder->norm = V4L2_STD_PAL;
  
  	err = saa7191_autodetect_norm(sd);
  	if (err && (err != -EBUSY))
  		printk(KERN_ERR "SAA7191: Signal auto-detection failed
  ");
  
  	return 0;
  }
  
  static int saa7191_remove(struct i2c_client *client)
  {
  	struct v4l2_subdev *sd = i2c_get_clientdata(client);
  
  	v4l2_device_unregister_subdev(sd);
  	return 0;
  }
  
  static const struct i2c_device_id saa7191_id[] = {
  	{ "saa7191", 0 },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, saa7191_id);
  
  static struct i2c_driver saa7191_driver = {
  	.driver = {
  		.owner	= THIS_MODULE,
  		.name	= "saa7191",
  	},
  	.probe		= saa7191_probe,
  	.remove		= saa7191_remove,
  	.id_table	= saa7191_id,
  };
  
  module_i2c_driver(saa7191_driver);