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Subject[patch 081/149] hwmon: (ltc4245) Read only one GPIO pin
2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Ira W. Snyder <iws@ovro.caltech.edu>

commit df16dd53c575d0cb9dbee20a3149927c862a9ff6 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
Documentation/hwmon/ltc4245 | 4 +---
drivers/hwmon/ltc4245.c | 18 +++++-------------
2 files changed, 6 insertions(+), 16 deletions(-)

--- a/Documentation/hwmon/ltc4245
+++ b/Documentation/hwmon/ltc4245
@@ -72,9 +72,7 @@ in6_min_alarm 5v output undervoltage a
in7_min_alarm 3v output undervoltage alarm
in8_min_alarm Vee (-12v) output undervoltage alarm

-in9_input GPIO #1 voltage data
-in10_input GPIO #2 voltage data
-in11_input GPIO #3 voltage data
+in9_input GPIO voltage data

power1_input 12v power usage (mW)
power2_input 5v power usage (mW)
--- 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_upda
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 de
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), L
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_attribu
&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,



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