hwmon: (max34440) Add support for 'lowest' output voltage attribute
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>
diff --git a/Documentation/hwmon/max34440 b/Documentation/hwmon/max34440
index 8ab5153..36b335c 100644
--- a/Documentation/hwmon/max34440
+++ b/Documentation/hwmon/max34440
@@ -56,6 +56,7 @@
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.
diff --git a/drivers/hwmon/pmbus/max34440.c b/drivers/hwmon/pmbus/max34440.c
index 7d830c1..95ee9e1 100644
--- a/drivers/hwmon/pmbus/max34440.c
+++ b/drivers/hwmon/pmbus/max34440.c
@@ -30,6 +30,7 @@
#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 @@
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);
@@ -73,6 +78,10 @@
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;
case PMBUS_VIRT_RESET_IOUT_HISTORY: