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V4L/DVB (11787): xc5000: cleanup i2c read routines 

This patch centralizes the i2c read functions, and eliminates pass-through
function only called by one caller.

Make reading of xc5000 registers an atomic i2c transaction in case we're on a
multi-master bus.

Signed-off-by: Devin Heitmueller <devin.heitmueller@gmail.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Devin Heitmueller 2008-11-16 20:17:14 -03:00 committed by Mauro Carvalho Chehab
parent 91bd625e21
commit bdd335636a
1 changed files with 20 additions and 42 deletions
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62
drivers/media/common/tuners/xc5000.c
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@ -193,7 +193,7 @@ static struct XC_TV_STANDARD XC5000_Standard[MAX_TV_STANDARD] = {
static int xc5000_is_firmware_loaded(struct dvb_frontend *fe);
static int xc5000_writeregs(struct xc5000_priv *priv, u8 *buf, u8 len);
static int xc5000_readregs(struct xc5000_priv *priv, u8 *buf, u8 len);
static int xc5000_readreg(struct xc5000_priv *priv, u16 reg, u16 *val);
static int xc5000_TunerReset(struct dvb_frontend *fe);
static int xc_send_i2c_data(struct xc5000_priv *priv, u8 *buf, int len)
@ -202,10 +202,19 @@ static int xc_send_i2c_data(struct xc5000_priv *priv, u8 *buf, int len)
? XC_RESULT_I2C_WRITE_FAILURE : XC_RESULT_SUCCESS;
}
/* This routine is never used because the only time we read data from the
i2c bus is when we read registers, and we want that to be an atomic i2c
transaction in case we are on a multi-master bus */
static int xc_read_i2c_data(struct xc5000_priv *priv, u8 *buf, int len)
{
return xc5000_readregs(priv, buf, len)
? XC_RESULT_I2C_READ_FAILURE : XC_RESULT_SUCCESS;
struct i2c_msg msg = { .addr = priv->i2c_props.addr,
.flags = I2C_M_RD, .buf = buf, .len = len };
if (i2c_transfer(priv->i2c_props.adap, &msg, 1) != 1) {
printk(KERN_ERR "xc5000 I2C read failed (len=%i)\n", len);
return -EREMOTEIO;
}
return 0;
}
static void xc_wait(int wait_ms)
@ -275,25 +284,6 @@ static int xc_write_reg(struct xc5000_priv *priv, u16 regAddr, u16 i2cData)
return result;
}
static int xc_read_reg(struct xc5000_priv *priv, u16 regAddr, u16 *i2cData)
{
u8 buf[2];
int result;
buf[0] = (regAddr >> 8) & 0xFF;
buf[1] = regAddr & 0xFF;
result = xc_send_i2c_data(priv, buf, 2);
if (result != XC_RESULT_SUCCESS)
return result;
result = xc_read_i2c_data(priv, buf, 2);
if (result != XC_RESULT_SUCCESS)
return result;
*i2cData = buf[0] * 256 + buf[1];
return result;
}
static int xc_load_i2c_sequence(struct dvb_frontend *fe, const u8 *i2c_sequence)
{
struct xc5000_priv *priv = fe->tuner_priv;
@ -423,7 +413,7 @@ static int xc_set_IF_frequency(struct xc5000_priv *priv, u32 freq_khz)
static int xc_get_ADC_Envelope(struct xc5000_priv *priv, u16 *adc_envelope)
{
return xc_read_reg(priv, XREG_ADC_ENV, adc_envelope);
return xc5000_readreg(priv, XREG_ADC_ENV, adc_envelope);
}
static int xc_get_frequency_error(struct xc5000_priv *priv, u32 *freq_error_hz)
@ -432,7 +422,7 @@ static int xc_get_frequency_error(struct xc5000_priv *priv, u32 *freq_error_hz)
u16 regData;
u32 tmp;
result = xc_read_reg(priv, XREG_FREQ_ERROR, &regData);
result = xc5000_readreg(priv, XREG_FREQ_ERROR, &regData);
if (result)
return result;
@ -443,7 +433,7 @@ static int xc_get_frequency_error(struct xc5000_priv *priv, u32 *freq_error_hz)
static int xc_get_lock_status(struct xc5000_priv *priv, u16 *lock_status)
{
return xc_read_reg(priv, XREG_LOCK, lock_status);
return xc5000_readreg(priv, XREG_LOCK, lock_status);
}
static int xc_get_version(struct xc5000_priv *priv,
@ -453,7 +443,7 @@ static int xc_get_version(struct xc5000_priv *priv,
u16 data;
int result;
result = xc_read_reg(priv, XREG_VERSION, &data);
result = xc5000_readreg(priv, XREG_VERSION, &data);
if (result)
return result;
@ -470,7 +460,7 @@ static int xc_get_hsync_freq(struct xc5000_priv *priv, u32 *hsync_freq_hz)
u16 regData;
int result;
result = xc_read_reg(priv, XREG_HSYNC_FREQ, &regData);
result = xc5000_readreg(priv, XREG_HSYNC_FREQ, &regData);
if (result)
return result;
@ -480,12 +470,12 @@ static int xc_get_hsync_freq(struct xc5000_priv *priv, u32 *hsync_freq_hz)
static int xc_get_frame_lines(struct xc5000_priv *priv, u16 *frame_lines)
{
return xc_read_reg(priv, XREG_FRAME_LINES, frame_lines);
return xc5000_readreg(priv, XREG_FRAME_LINES, frame_lines);
}
static int xc_get_quality(struct xc5000_priv *priv, u16 *quality)
{
return xc_read_reg(priv, XREG_QUALITY, quality);
return xc5000_readreg(priv, XREG_QUALITY, quality);
}
static u16 WaitForLock(struct xc5000_priv *priv)
@ -535,7 +525,7 @@ static int xc5000_readreg(struct xc5000_priv *priv, u16 reg, u16 *val)
}
*val = (bval[0] << 8) | bval[1];
return 0;
return XC_RESULT_SUCCESS;
}
static int xc5000_writeregs(struct xc5000_priv *priv, u8 *buf, u8 len)
@ -551,18 +541,6 @@ static int xc5000_writeregs(struct xc5000_priv *priv, u8 *buf, u8 len)
return 0;
}
static int xc5000_readregs(struct xc5000_priv *priv, u8 *buf, u8 len)
{
struct i2c_msg msg = { .addr = priv->i2c_props.addr,
.flags = I2C_M_RD, .buf = buf, .len = len };
if (i2c_transfer(priv->i2c_props.adap, &msg, 1) != 1) {
printk(KERN_ERR "xc5000 I2C read failed (len=%i)\n", (int)len);
return -EREMOTEIO;
}
return 0;
}
static int xc5000_fwupload(struct dvb_frontend *fe)
{
struct xc5000_priv *priv = fe->tuner_priv;