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hwmon: (max34440) Add support for 'lowest' output voltage attribute

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MAX34440 and compatibles support reporting the lowest measured output voltage.
Add support for it.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Guenter Roeck 2012-02-24 08:13:31 -08:00 committed by Guenter Roeck
parent f15df57ded
commit 56aad5d143
2 changed files with 10 additions and 0 deletions
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1
Documentation/hwmon/max34440
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@ -56,6 +56,7 @@ in[1-6]_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status.
in[1-6]_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status.
in[1-6]_lcrit_alarm Voltage critical low alarm. From VOLTAGE_UV_FAULT status.
in[1-6]_crit_alarm Voltage critical high alarm. From VOLTAGE_OV_FAULT status.
in[1-6]_lowest Historical minimum voltage.
in[1-6]_highest Historical maximum voltage.
in[1-6]_reset_history Write any value to reset history.

9
drivers/hwmon/pmbus/max34440.c
View file

@ -30,6 +30,7 @@ enum chips { max34440, max34441 };
#define MAX34440_MFR_VOUT_PEAK 0xd4
#define MAX34440_MFR_IOUT_PEAK 0xd5
#define MAX34440_MFR_TEMPERATURE_PEAK 0xd6
#define MAX34440_MFR_VOUT_MIN 0xd7
#define MAX34440_STATUS_OC_WARN (1 << 0)
#define MAX34440_STATUS_OC_FAULT (1 << 1)
@ -41,6 +42,10 @@ static int max34440_read_word_data(struct i2c_client *client, int page, int reg)
int ret;
switch (reg) {
case PMBUS_VIRT_READ_VOUT_MIN:
ret = pmbus_read_word_data(client, page,
MAX34440_MFR_VOUT_MIN);
break;
case PMBUS_VIRT_READ_VOUT_MAX:
ret = pmbus_read_word_data(client, page,
MAX34440_MFR_VOUT_PEAK);
@ -72,6 +77,10 @@ static int max34440_write_word_data(struct i2c_client *client, int page,
switch (reg) {
case PMBUS_VIRT_RESET_VOUT_HISTORY:
ret = pmbus_write_word_data(client, page,
MAX34440_MFR_VOUT_MIN, 0x7fff);
if (ret)
break;
ret = pmbus_write_word_data(client, page,
MAX34440_MFR_VOUT_PEAK, 0);
break;