/*
* 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/videodev.h>
#include <linux/video_decoder.h>
#include <linux/i2c.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 i2c_client *client;
/* the register values are stored here as the actual
* I2C-registers are write-only */
u8 reg[25];
int input;
int norm;
};
static struct i2c_driver i2c_driver_saa7191;
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 i2c_client *client,
u8 reg)
{
return ((struct saa7191 *)i2c_get_clientdata(client))->reg[reg];
}
static int saa7191_read_status(struct i2c_client *client,
u8 *value)
{
int ret;
ret = i2c_master_recv(client, value, 1);
if (ret < 0) {
printk(KERN_ERR "SAA7191: saa7191_read_status(): read failed\n");
return ret;
}
return 0;
}
static int saa7191_write_reg(struct i2c_client *client, u8 reg,
u8 value)
{
((struct saa7191 *)i2c_get_clientdata(client))->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 i2c_client *client,
u8 length, const u8 *data)
{
int i;
int ret;
struct saa7191 *decoder = (struct saa7191 *)i2c_get_clientdata(client);
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\n");
return ret;
}
return 0;
}
/* Helper functions */
static int saa7191_set_input(struct i2c_client *client, int input)
{
struct saa7191 *decoder = i2c_get_clientdata(client);
u8 luma = saa7191_read_reg(client, SAA7191_REG_LUMA);
u8 iock = saa7191_read_reg(client, 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(client, SAA7191_REG_LUMA, luma);
if (err)
return -EIO;
err = saa7191_write_reg(client, SAA7191_REG_IOCK, iock);
if (err)
return -EIO;
decoder->input = input;
return 0;
}
static int saa7191_set_norm(struct i2c_client *client, int norm)
{
struct saa7191 *decoder = i2c_get_clientdata(client);
u8 stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
u8 ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
u8 chcv = saa7191_read_reg(client, SAA7191_REG_CHCV);
int err;
switch(norm) {
case SAA7191_NORM_PAL:
stdc &= ~SAA7191_STDC_SECS;
ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
chcv = SAA7191_CHCV_PAL;
break;
case SAA7191_NORM_NTSC:
stdc &= ~SAA7191_STDC_SECS;
ctl3 &= ~SAA7191_CTL3_AUFD;
ctl3 |= SAA7191_CTL3_FSEL;
chcv = SAA7191_CHCV_NTSC;
break;
case SAA7191_NORM_SECAM:
stdc |= SAA7191_STDC_SECS;
ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
chcv = SAA7191_CHCV_PAL;
break;
default:
return -EINVAL;
}
err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
if (err)
return -EIO;
err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
if (err)
return -EIO;
err = saa7191_write_reg(client, SAA7191_REG_CHCV, chcv);
if (err)
return -EIO;
decoder->norm = norm;
dprintk("ctl3: %02x stdc: %02x chcv: %02x\n", ctl3,
stdc, chcv);
dprintk("norm: %d\n", norm);
return 0;
}
static int saa7191_wait_for_signal(struct i2c_client *client, u8 *status)
{
int i = 0;
dprintk("Checking for signal...\n");
for (i = 0; i < SAA7191_SYNC_COUNT; i++) {
if (saa7191_read_status(client, status))
return -EIO;
if (((*status) & SAA7191_STATUS_HLCK) == 0) {
dprintk("Signal found\n");
return 0;
}
msleep(SAA7191_SYNC_DELAY);
}
dprintk("No signal\n");
return -EBUSY;
}
static int saa7191_autodetect_norm_extended(struct i2c_client *client)
{
u8 stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
u8 ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
u8 status;
int err = 0;
dprintk("SAA7191 extended signal auto-detection...\n");
stdc &= ~SAA7191_STDC_SECS;
ctl3 &= ~(SAA7191_CTL3_FSEL);
err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
if (err) {
err = -EIO;
goto out;
}
err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
if (err) {
err = -EIO;
goto out;
}
ctl3 |= SAA7191_CTL3_AUFD;
err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
if (err) {
err = -EIO;
goto out;
}
msleep(SAA7191_SYNC_DELAY);
err = saa7191_wait_for_signal(client, &status);
if (err)
goto out;
if (status & SAA7191_STATUS_FIDT) {
/* 60Hz signal -> NTSC */
dprintk("60Hz signal: NTSC\n");
return saa7191_set_norm(client, SAA7191_NORM_NTSC);
}
/* 50Hz signal */
dprintk("50Hz signal: Trying PAL...\n");
/* try PAL first */
err = saa7191_set_norm(client, SAA7191_NORM_PAL);
if (err)
goto out;
msleep(SAA7191_SYNC_DELAY);
err = saa7191_wait_for_signal(client, &status);
if (err)
goto out;
/* not 50Hz ? */
if (status & SAA7191_STATUS_FIDT) {
dprintk("No 50Hz signal\n");
err = -EAGAIN;
goto out;
}
if (status & SAA7191_STATUS_CODE) {
dprintk("PAL\n");
return 0;
}
dprintk("No color detected with PAL - Trying SECAM...\n");
/* no color detected ? -> try SECAM */
err = saa7191_set_norm(client,
SAA7191_NORM_SECAM);
if (err)
goto out;
msleep(SAA7191_SYNC_DELAY);
err = saa7191_wait_for_signal(client, &status);
if (err)
goto out;
/* not 50Hz ? */
if (status & SAA7191_STATUS_FIDT) {
dprintk("No 50Hz signal\n");
err = -EAGAIN;
goto out;
}
if (status & SAA7191_STATUS_CODE) {
/* Color detected -> SECAM */
dprintk("SECAM\n");
return 0;
}
dprintk("No color detected with SECAM - Going back to PAL.\n");
/* still no color detected ?
* -> set norm back to PAL */
err = saa7191_set_norm(client,
SAA7191_NORM_PAL);
if (err)
goto out;
out:
ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
if (ctl3 & SAA7191_CTL3_AUFD) {
ctl3 &= ~(SAA7191_CTL3_AUFD);
err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
if (err) {
err = -EIO;
}
}
return err;
}
static int saa7191_autodetect_norm(struct i2c_client *client)
{
u8 status;
dprintk("SAA7191 signal auto-detection...\n");
dprintk("Reading status...\n");
if (saa7191_read_status(client, &status))
return -EIO;
dprintk("Checking for signal...\n");
/* no signal ? */
if (status & SAA7191_STATUS_HLCK) {
dprintk("No signal\n");
return -EBUSY;
}
dprintk("Signal found\n");
if (status & SAA7191_STATUS_FIDT) {
/* 60hz signal -> NTSC */
dprintk("NTSC\n");
return saa7191_set_norm(client, SAA7191_NORM_NTSC);
} else {
/* 50hz signal -> PAL */
dprintk("PAL\n");
return saa7191_set_norm(client, SAA7191_NORM_PAL);
}
}
static int saa7191_get_control(struct i2c_client *client,
struct saa7191_control *ctrl)
{
u8 reg;
int ret = 0;
switch (ctrl->type) {
case SAA7191_CONTROL_BANDPASS:
case SAA7191_CONTROL_BANDPASS_WEIGHT:
case SAA7191_CONTROL_CORING:
reg = saa7191_read_reg(client, SAA7191_REG_LUMA);
switch (ctrl->type) {
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(client, SAA7191_REG_GAIN);
if (ctrl->type == 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 SAA7191_CONTROL_HUE:
reg = saa7191_read_reg(client, SAA7191_REG_HUEC);
if (reg < 0x80)
reg += 0x80;
else
reg -= 0x80;
ctrl->value = (s32)reg;
break;
case SAA7191_CONTROL_VTRC:
reg = saa7191_read_reg(client, SAA7191_REG_STDC);
ctrl->value = ((s32)reg & SAA7191_STDC_VTRC) ? 1 : 0;
break;
case SAA7191_CONTROL_LUMA_DELAY:
reg = saa7191_read_reg(client, 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(client, SAA7191_REG_CTL4);
ctrl->value = ((s32)reg & SAA7191_CTL4_VNOI_MASK)
>> SAA7191_CTL4_VNOI_SHIFT;
break;
default:
ret = -EINVAL;
}
return ret;
}
static int saa7191_set_control(struct i2c_client *client,
struct saa7191_control *ctrl)
{
u8 reg;
int ret = 0;
switch (ctrl->type) {
case SAA7191_CONTROL_BANDPASS:
case SAA7191_CONTROL_BANDPASS_WEIGHT:
case SAA7191_CONTROL_CORING:
reg = saa7191_read_reg(client, SAA7191_REG_LUMA);
switch (ctrl->type) {
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(client, SAA7191_REG_LUMA, reg);
break;
case SAA7191_CONTROL_FORCE_COLOUR:
case SAA7191_CONTROL_CHROMA_GAIN:
reg = saa7191_read_reg(client, SAA7191_REG_GAIN);
if (ctrl->type == 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(client, SAA7191_REG_GAIN, reg);
break;
case SAA7191_CONTROL_HUE:
reg = ctrl->value & 0xff;
if (reg < 0x80)
reg += 0x80;
else
reg -= 0x80;
ret = saa7191_write_reg(client, SAA7191_REG_HUEC, reg);
break;
case SAA7191_CONTROL_VTRC:
reg = saa7191_read_reg(client, SAA7191_REG_STDC);
if (ctrl->value)
reg |= SAA7191_STDC_VTRC;
else
reg &= ~SAA7191_STDC_VTRC;
ret = saa7191_write_reg(client, SAA7191_REG_STDC, reg);
break;
case SAA7191_CONTROL_LUMA_DELAY: {
s32 value = ctrl->value;
if (value < 0)
value += 8;
reg = saa7191_read_reg(client, SAA7191_REG_CTL3);
reg &= ~SAA7191_CTL3_YDEL_MASK;
reg |= (value << SAA7191_CTL3_YDEL_SHIFT)
& SAA7191_CTL3_YDEL_MASK;
ret = saa7191_write_reg(client, SAA7191_REG_CTL3, reg);
break;
}
case SAA7191_CONTROL_VNR:
reg = saa7191_read_reg(client, SAA7191_REG_CTL4);
reg &= ~SAA7191_CTL4_VNOI_MASK;
reg |= (ctrl->value << SAA7191_CTL4_VNOI_SHIFT)
& SAA7191_CTL4_VNOI_MASK;
ret = saa7191_write_reg(client, SAA7191_REG_CTL4, reg);
break;
default:
ret = -EINVAL;
}
return ret;
}
/* I2C-interface */
static int saa7191_attach(struct i2c_adapter *adap, int addr, int kind)
{
int err = 0;
struct saa7191 *decoder;
struct i2c_client *client;
printk(KERN_INFO "Philips SAA7191 driver version %s\n",
SAA7191_MODULE_VERSION);
client = kzalloc(sizeof(*client), GFP_KERNEL);
if (!client)
return -ENOMEM;
decoder = kzalloc(sizeof(*decoder), GFP_KERNEL);
if (!decoder) {
err = -ENOMEM;
goto out_free_client;
}
client->addr = addr;
client->adapter = adap;
client->driver = &i2c_driver_saa7191;
client->flags = 0;
strcpy(client->name, "saa7191 client");
i2c_set_clientdata(client, decoder);
decoder->client = client;
err = i2c_attach_client(client);
if (err)
goto out_free_decoder;
err = saa7191_write_block(client, sizeof(initseq), initseq);
if (err) {
printk(KERN_ERR "SAA7191 initialization failed\n");
goto out_detach_client;
}
printk(KERN_INFO "SAA7191 initialized\n");
decoder->input = SAA7191_INPUT_COMPOSITE;
decoder->norm = SAA7191_NORM_PAL;
err = saa7191_autodetect_norm(client);
if (err && (err != -EBUSY)) {
printk(KERN_ERR "SAA7191: Signal auto-detection failed\n");
}
return 0;
out_detach_client:
i2c_detach_client(client);
out_free_decoder:
kfree(decoder);
out_free_client:
kfree(client);
return err;
}
static int saa7191_probe(struct i2c_adapter *adap)
{
/* Always connected to VINO */
if (adap->id == I2C_HW_SGI_VINO)
return saa7191_attach(adap, SAA7191_ADDR, 0);
/* Feel free to add probe here :-) */
return -ENODEV;
}
static int saa7191_detach(struct i2c_client *client)
{
struct saa7191 *decoder = i2c_get_clientdata(client);
i2c_detach_client(client);
kfree(decoder);
kfree(client);
return 0;
}
static int saa7191_command(struct i2c_client *client, unsigned int cmd,
void *arg)
{
struct saa7191 *decoder = i2c_get_clientdata(client);
switch (cmd) {
case DECODER_GET_CAPABILITIES: {
struct video_decoder_capability *cap = arg;
cap->flags = VIDEO_DECODER_PAL | VIDEO_DECODER_NTSC |
VIDEO_DECODER_SECAM | VIDEO_DECODER_AUTO;
cap->inputs = (client->adapter->id == I2C_HW_SGI_VINO) ? 2 : 1;
cap->outputs = 1;
break;
}
case DECODER_GET_STATUS: {
int *iarg = arg;
u8 status;
int res = 0;
if (saa7191_read_status(client, &status)) {
return -EIO;
}
if ((status & SAA7191_STATUS_HLCK) == 0)
res |= DECODER_STATUS_GOOD;
if (status & SAA7191_STATUS_CODE)
res |= DECODER_STATUS_COLOR;
switch (decoder->norm) {
case SAA7191_NORM_NTSC:
res |= DECODER_STATUS_NTSC;
break;
case SAA7191_NORM_PAL:
res |= DECODER_STATUS_PAL;
break;
case SAA7191_NORM_SECAM:
res |= DECODER_STATUS_SECAM;
break;
case SAA7191_NORM_AUTO:
default:
if (status & SAA7191_STATUS_FIDT)
res |= DECODER_STATUS_NTSC;
else
res |= DECODER_STATUS_PAL;
break;
}
*iarg = res;
break;
}
case DECODER_SET_NORM: {
int *iarg = arg;
switch (*iarg) {
case VIDEO_MODE_AUTO:
return saa7191_autodetect_norm(client);
case VIDEO_MODE_PAL:
return saa7191_set_norm(client, SAA7191_NORM_PAL);
case VIDEO_MODE_NTSC:
return saa7191_set_norm(client, SAA7191_NORM_NTSC);
case VIDEO_MODE_SECAM:
return saa7191_set_norm(client, SAA7191_NORM_SECAM);
default:
return -EINVAL;
}
break;
}
case DECODER_SET_INPUT: {
int *iarg = arg;
switch (client->adapter->id) {
case I2C_HW_SGI_VINO:
return saa7191_set_input(client, *iarg);
default:
if (*iarg != 0)
return -EINVAL;
}
break;
}
case DECODER_SET_OUTPUT: {
int *iarg = arg;
/* not much choice of outputs */
if (*iarg != 0)
return -EINVAL;
break;
}
case DECODER_ENABLE_OUTPUT: {
/* Always enabled */
break;
}
case DECODER_SET_PICTURE: {
struct video_picture *pic = arg;
unsigned val;
int err;
val = (pic->hue >> 8) - 0x80;
err = saa7191_write_reg(client, SAA7191_REG_HUEC, val);
if (err)
return -EIO;
break;
}
case DECODER_SAA7191_GET_STATUS: {
struct saa7191_status *status = arg;
u8 status_reg;
if (saa7191_read_status(client, &status_reg))
return -EIO;
status->signal = ((status_reg & SAA7191_STATUS_HLCK) == 0)
? 1 : 0;
status->signal_60hz = (status_reg & SAA7191_STATUS_FIDT)
? 1 : 0;
status->color = (status_reg & SAA7191_STATUS_CODE) ? 1 : 0;
status->input = decoder->input;
status->norm = decoder->norm;
break;
}
case DECODER_SAA7191_SET_NORM: {
int *norm = arg;
switch (*norm) {
case SAA7191_NORM_AUTO:
return saa7191_autodetect_norm(client);
case SAA7191_NORM_AUTO_EXT:
return saa7191_autodetect_norm_extended(client);
default:
return saa7191_set_norm(client, *norm);
}
}
case DECODER_SAA7191_GET_CONTROL: {
return saa7191_get_control(client, arg);
}
case DECODER_SAA7191_SET_CONTROL: {
return saa7191_set_control(client, arg);
}
default:
return -EINVAL;
}
return 0;
}
static struct i2c_driver i2c_driver_saa7191 = {
.driver = {
.name = "saa7191",
},
.id = I2C_DRIVERID_SAA7191,
.attach_adapter = saa7191_probe,
.detach_client = saa7191_detach,
.command = saa7191_command
};
static int saa7191_init(void)
{
return i2c_add_driver(&i2c_driver_saa7191);
}
static void saa7191_exit(void)
{
i2c_del_driver(&i2c_driver_saa7191);
}
module_init(saa7191_init);
module_exit(saa7191_exit);
