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V4L/DVB: xc5000, rework xc_write_reg 

Rework xc_write_reg function for correct read register of the xc5000.
It is very useful for tm6000.

Tested for tm6000 and for saa7134 works well.

Signed-off-by: Beholder Intl. Ltd. Dmitry Belimov <d.belimov@gmail.com>
Acked-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Dmitri Belimov 2010-05-18 04:30:11 -03:00 committed by Mauro Carvalho Chehab
parent e252984c52
commit 4743319fb0
1 changed files with 26 additions and 31 deletions
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57
drivers/media/common/tuners/xc5000.c
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@ -232,6 +232,26 @@ static int xc_read_i2c_data(struct xc5000_priv *priv, u8 *buf, int len)
return 0;
}
static int xc5000_readreg(struct xc5000_priv *priv, u16 reg, u16 *val)
{
u8 buf[2] = { reg >> 8, reg & 0xff };
u8 bval[2] = { 0, 0 };
struct i2c_msg msg[2] = {
{ .addr = priv->i2c_props.addr,
.flags = 0, .buf = &buf[0], .len = 2 },
{ .addr = priv->i2c_props.addr,
.flags = I2C_M_RD, .buf = &bval[0], .len = 2 },
};
if (i2c_transfer(priv->i2c_props.adap, msg, 2) != 2) {
printk(KERN_WARNING "xc5000: I2C read failed\n");
return -EREMOTEIO;
}
*val = (bval[0] << 8) | bval[1];
return XC_RESULT_SUCCESS;
}
static void xc_wait(int wait_ms)
{
msleep(wait_ms);
@ -275,20 +295,14 @@ static int xc_write_reg(struct xc5000_priv *priv, u16 regAddr, u16 i2cData)
if (result == XC_RESULT_SUCCESS) {
/* wait for busy flag to clear */
while ((WatchDogTimer > 0) && (result == XC_RESULT_SUCCESS)) {
buf[0] = 0;
buf[1] = XREG_BUSY;
result = xc_send_i2c_data(priv, buf, 2);
result = xc5000_readreg(priv, XREG_BUSY, buf);
if (result == XC_RESULT_SUCCESS) {
result = xc_read_i2c_data(priv, buf, 2);
if (result == XC_RESULT_SUCCESS) {
if ((buf[0] == 0) && (buf[1] == 0)) {
/* busy flag cleared */
if ((buf[0] == 0) && (buf[1] == 0)) {
/* busy flag cleared */
break;
} else {
xc_wait(5); /* wait 5 ms */
WatchDogTimer--;
}
} else {
xc_wait(5); /* wait 5 ms */
WatchDogTimer--;
}
}
}
@ -526,25 +540,6 @@ static int xc_tune_channel(struct xc5000_priv *priv, u32 freq_hz, int mode)
return found;
}
static int xc5000_readreg(struct xc5000_priv *priv, u16 reg, u16 *val)
{
u8 buf[2] = { reg >> 8, reg & 0xff };
u8 bval[2] = { 0, 0 };
struct i2c_msg msg[2] = {
{ .addr = priv->i2c_props.addr,
.flags = 0, .buf = &buf[0], .len = 2 },
{ .addr = priv->i2c_props.addr,
.flags = I2C_M_RD, .buf = &bval[0], .len = 2 },
};
if (i2c_transfer(priv->i2c_props.adap, msg, 2) != 2) {
printk(KERN_WARNING "xc5000: I2C read failed\n");
return -EREMOTEIO;
}
*val = (bval[0] << 8) | bval[1];
return XC_RESULT_SUCCESS;
}
static int xc5000_fwupload(struct dvb_frontend *fe)
{