[media] si4713: Bug fix for si4713_tx_tune_power() method in the i2c driver

In the si4713_tx_tune_power() method, the args array element 'power'
can take values between SI4713_MIN_POWER and SI4713_MAX_POWER. power = 0
is also valid. All the values (0 > power < SI4713_MIN_POWER) are illegal
and hence are all mapped to SI4713_MIN_POWER.

Signed-off-by: Dinesh Ram <dinesh.ram@cern.ch>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Tested-by: Eduardo Valentin <edubezval@gmail.com>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/radio/si4713/si4713.c b/drivers/media/radio/si4713/si4713.c
index 096947c..4931325 100644 (file)
--- a/drivers/media/radio/si4713/si4713.c
+++ b/drivers/media/radio/si4713/si4713.c
@@ -555,14 +555,14 @@ static int si4713_tx_tune_freq(struct si4713_device *sdev, u16 frequency)
 }
 
 /*
- * si4713_tx_tune_power - Sets the RF voltage level between 88 and 115 dBuV in
+ * si4713_tx_tune_power - Sets the RF voltage level between 88 and 120 dBuV in
  *                     1 dB units. A value of 0x00 indicates off. The command
  *                     also sets the antenna tuning capacitance. A value of 0
  *                     indicates autotuning, and a value of 1 - 191 indicates
  *                     a manual override, which results in a tuning
  *                     capacitance of 0.25 pF x @antcap.
  * @sdev: si4713_device structure for the device we are communicating
- * @power: tuning power (88 - 115 dBuV, unit/step 1 dB)
+ * @power: tuning power (88 - 120 dBuV, unit/step 1 dB)
  * @antcap: value of antenna tuning capacitor (0 - 191)
  */
 static int si4713_tx_tune_power(struct si4713_device *sdev, u8 power,
@@ -576,16 +576,16 @@ static int si4713_tx_tune_power(struct si4713_device *sdev, u8 power,
         *      .Third byte = power
         *      .Fourth byte = antcap
         */
-       const u8 args[SI4713_TXPWR_NARGS] = {
+       u8 args[SI4713_TXPWR_NARGS] = {
                0x00,
                0x00,
                power,
                antcap,
        };
 
-       if (((power > 0) && (power < SI4713_MIN_POWER)) ||
-               power > SI4713_MAX_POWER || antcap > SI4713_MAX_ANTCAP)
-               return -EDOM;
+       /* Map power values 1-87 to MIN_POWER (88) */
+       if (power > 0 && power < SI4713_MIN_POWER)
+               args[2] = power = SI4713_MIN_POWER;
 
        err = si4713_send_command(sdev, SI4713_CMD_TX_TUNE_POWER,
                                  args, ARRAY_SIZE(args), val,
@@ -1462,9 +1462,9 @@ static int si4713_probe(struct i2c_client *client,
                        V4L2_CID_TUNE_PREEMPHASIS,
                        V4L2_PREEMPHASIS_75_uS, 0, V4L2_PREEMPHASIS_50_uS);
        sdev->tune_pwr_level = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
-                       V4L2_CID_TUNE_POWER_LEVEL, 0, 120, 1, DEFAULT_POWER_LEVEL);
+                       V4L2_CID_TUNE_POWER_LEVEL, 0, SI4713_MAX_POWER, 1, DEFAULT_POWER_LEVEL);
        sdev->tune_ant_cap = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
-                       V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0, 191, 1, 0);
+                       V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0, SI4713_MAX_ANTCAP, 1, 0);
 
        if (hdl->error) {
                rval = hdl->error;