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[media] drx-j: re-add get_sig_strength()

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We'll need to use this function. Restore it from the
git history.

This function will be used on the next patch.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2014-03-09 17:37:27 -03:00
parent 6f64c522bc
commit 80e5ed14e1
1 changed files with 77 additions and 0 deletions
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77
drivers/media/dvb-frontends/drx39xyj/drxj.c
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@ -9351,6 +9351,83 @@ get_qamrs_err_count(struct i2c_device_addr *dev_addr, struct drxjrs_errors *rs_e
/*============================================================================*/
/**
* \fn int get_sig_strength()
* \brief Retrieve signal strength for VSB and QAM.
* \param demod Pointer to demod instance
* \param u16-t Pointer to signal strength data; range 0, .. , 100.
* \return int.
* \retval 0 sig_strength contains valid data.
* \retval -EINVAL sig_strength is NULL.
* \retval -EIO Erroneous data, sig_strength contains invalid data.
*/
#define DRXJ_AGC_TOP 0x2800
#define DRXJ_AGC_SNS 0x1600
#define DRXJ_RFAGC_MAX 0x3fff
#define DRXJ_RFAGC_MIN 0x800
static int get_sig_strength(struct drx_demod_instance *demod, u16 *sig_strength)
{
struct i2c_device_addr *dev_addr = demod->my_i2c_dev_addr;
int rc;
u16 rf_gain = 0;
u16 if_gain = 0;
u16 if_agc_sns = 0;
u16 if_agc_top = 0;
u16 rf_agc_max = 0;
u16 rf_agc_min = 0;
rc = drxj_dap_read_reg16(dev_addr, IQM_AF_AGC_IF__A, &if_gain, 0);
if (rc != 0) {
pr_err("error %d\n", rc);
goto rw_error;
}
if_gain &= IQM_AF_AGC_IF__M;
rc = drxj_dap_read_reg16(dev_addr, IQM_AF_AGC_RF__A, &rf_gain, 0);
if (rc != 0) {
pr_err("error %d\n", rc);
goto rw_error;
}
rf_gain &= IQM_AF_AGC_RF__M;
if_agc_sns = DRXJ_AGC_SNS;
if_agc_top = DRXJ_AGC_TOP;
rf_agc_max = DRXJ_RFAGC_MAX;
rf_agc_min = DRXJ_RFAGC_MIN;
if (if_gain > if_agc_top) {
if (rf_gain > rf_agc_max)
*sig_strength = 100;
else if (rf_gain > rf_agc_min) {
if (rf_agc_max == rf_agc_min) {
pr_err("error: rf_agc_max == rf_agc_min\n");
return -EIO;
}
*sig_strength =
75 + 25 * (rf_gain - rf_agc_min) / (rf_agc_max -
rf_agc_min);
} else
*sig_strength = 75;
} else if (if_gain > if_agc_sns) {
if (if_agc_top == if_agc_sns) {
pr_err("error: if_agc_top == if_agc_sns\n");
return -EIO;
}
*sig_strength =
20 + 55 * (if_gain - if_agc_sns) / (if_agc_top - if_agc_sns);
} else {
if (!if_agc_sns) {
pr_err("error: if_agc_sns is zero!\n");
return -EIO;
}
*sig_strength = (20 * if_gain / if_agc_sns);
}
return 0;
rw_error:
return -EIO;
}
/**
* \fn int ctrl_get_qam_sig_quality()
* \brief Retreive QAM signal quality from device.