- 根目录:
- drivers
- media
- video
- saa7191.c
/*
* 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 <media/v4l2-chip-ident.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\n");
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\n");
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\n", ctl3,
stdc, chcv);
dprintk("norm: %llx\n", norm);
return 0;
}
static int saa7191_wait_for_signal(struct v4l2_subdev *sd, u8 *status)
{
int i = 0;
dprintk("Checking for signal...\n");
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\n");
return 0;
}
msleep(SAA7191_SYNC_DELAY);
}
dprintk("No signal\n");
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...\n");
*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\n");
*norm = V4L2_STD_NTSC;
return 0;
}
/* 50Hz signal */
dprintk("50Hz signal: Trying PAL...\n");
/* 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\n");
saa7191_s_std(sd, old_norm);
return -EAGAIN;
}
if (status & SAA7191_STATUS_CODE) {
dprintk("PAL\n");
*norm = V4L2_STD_PAL;
return saa7191_s_std(sd, old_norm);
}
dprintk("No color detected with PAL - Trying SECAM...\n");
/* 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\n");
err = -EAGAIN;
goto out;
}
if (status & SAA7191_STATUS_CODE) {
/* Color detected -> SECAM */
dprintk("SECAM\n");
*norm = V4L2_STD_SECAM;
return saa7191_s_std(sd, old_norm);
}
dprintk("No color detected with SECAM - Going back to PAL.\n");
out:
return saa7191_s_std(sd, old_norm);
}
static int saa7191_autodetect_norm(struct v4l2_subdev *sd)
{
u8 status;
dprintk("SAA7191 signal auto-detection...\n");
dprintk("Reading status...\n");
if (saa7191_read_status(sd, &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_s_std(sd, V4L2_STD_NTSC);
} else {
/* 50hz signal -> PAL */
dprintk("PAL\n");
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 int saa7191_g_chip_ident(struct v4l2_subdev *sd,
struct v4l2_dbg_chip_ident *chip)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_SAA7191, 0);
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_core_ops saa7191_core_ops = {
.g_chip_ident = saa7191_g_chip_ident,
.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)\n",
client->addr << 1, client->adapter->name);
decoder = kzalloc(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\n");
kfree(decoder);
return err;
}
printk(KERN_INFO "SAA7191 initialized\n");
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\n");
return 0;
}
static int saa7191_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
kfree(to_saa7191(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);