hwmon: (ltc4245) Read only one GPIO pin

Read only one of the GPIO pins as an analog voltage. The ADC can be
switched to a different GPIO pin at runtime, but this is not supported.

Previously, this driver would report the analog voltage of the currently
selected GPIO pin as all three GPIO voltages: in9_input, in10_input and
in11_input.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: stable@kernel.org

1 files changed, 5 insertions, 13 deletions

diff --git a/drivers/hwmon/ltc4245.c b/drivers/hwmon/ltc4245.c
index 65c232a9d0c5..21d201befc2c 100644
--- a/drivers/hwmon/ltc4245.c
+++ b/drivers/hwmon/ltc4245.c
@@ -45,9 +45,7 @@ enum ltc4245_cmd {
         LTC4245_VEEIN                   = 0x19,
         LTC4245_VEESENSE                = 0x1a,
         LTC4245_VEEOUT                  = 0x1b,
-        LTC4245_GPIOADC1                = 0x1c,
-        LTC4245_GPIOADC2                = 0x1d,
-        LTC4245_GPIOADC3                = 0x1e,
+        LTC4245_GPIOADC                 = 0x1c,
 };
 
 struct ltc4245_data {
@@ -61,7 +59,7 @@ struct ltc4245_data {
         u8 cregs[0x08];
 
         /* Voltage registers */
-        u8 vregs[0x0f];
+        u8 vregs[0x0d];
 };
 
 static struct ltc4245_data *ltc4245_update_device(struct device *dev)
@@ -86,7 +84,7 @@ static struct ltc4245_data *ltc4245_update_device(struct device *dev)
                                 data->cregs[i] = val;
                 }
 
-                /* Read voltage registers -- 0x10 to 0x1f */
+                /* Read voltage registers -- 0x10 to 0x1c */
                 for (i = 0; i < ARRAY_SIZE(data->vregs); i++) {
                         val = i2c_smbus_read_byte_data(client, i+0x10);
                         if (unlikely(val < 0))
@@ -128,9 +126,7 @@ static int ltc4245_get_voltage(struct device *dev, u8 reg)
         case LTC4245_VEEOUT:
                 voltage = regval * -55;
                 break;
-        case LTC4245_GPIOADC1:
-        case LTC4245_GPIOADC2:
-        case LTC4245_GPIOADC3:
+        case LTC4245_GPIOADC:
                 voltage = regval * 10;
                 break;
         default:
@@ -297,9 +293,7 @@ LTC4245_ALARM(in7_min_alarm,	(1 << 2),	LTC4245_FAULT2);
 LTC4245_ALARM(in8_min_alarm,    (1 << 3),       LTC4245_FAULT2);
 
 /* GPIO voltages */
-LTC4245_VOLTAGE(in9_input,                      LTC4245_GPIOADC1);
-LTC4245_VOLTAGE(in10_input,                     LTC4245_GPIOADC2);
-LTC4245_VOLTAGE(in11_input,                     LTC4245_GPIOADC3);
+LTC4245_VOLTAGE(in9_input,                      LTC4245_GPIOADC);
 
 /* Power Consumption (virtual) */
 LTC4245_POWER(power1_input,                     LTC4245_12VSENSE);
@@ -342,8 +336,6 @@ static struct attribute *ltc4245_attributes[] = {
         &sensor_dev_attr_in8_min_alarm.dev_attr.attr,
 
         &sensor_dev_attr_in9_input.dev_attr.attr,
-        &sensor_dev_attr_in10_input.dev_attr.attr,
-        &sensor_dev_attr_in11_input.dev_attr.attr,
 
         &sensor_dev_attr_power1_input.dev_attr.attr,
         &sensor_dev_attr_power2_input.dev_attr.attr,