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.che...@samsung.com>
---
drivers/media/dvb-frontends/drx39xyj/drxj.c | 77 +++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
diff --git a/drivers/media/dvb-frontends/drx39xyj/drxj.c
b/drivers/media/dvb-frontends/drx39xyj/drxj.c
index 7022a69f56bd..ca807b1fc67c 100644
--- a/drivers/media/dvb-frontends/drx39xyj/drxj.c
+++ b/drivers/media/dvb-frontends/drx39xyj/drxj.c
@@ -9352,6 +9352,83 @@ rw_error:
/*============================================================================*/
/**
+ * \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.
* \param devmod Pointer to demodulator instance.
--
1.8.5.3
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