Add support for voltage, current, and temperature peak (historic maximum)
attributes.
Signed-off-by: Guenter Roeck <guenter.roeck@xxxxxxxxxxxx>
---
v2: Updated documentation
Documentation/hwmon/max8688 | 6 ++++
drivers/hwmon/pmbus/max8688.c | 61 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+), 0 deletions(-)
diff --git a/Documentation/hwmon/max8688 b/Documentation/hwmon/max8688
index 0ddd3a4..71ed10a 100644
--- a/Documentation/hwmon/max8688
+++ b/Documentation/hwmon/max8688
@@ -50,6 +50,8 @@ in1_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status.
in1_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status.
in1_lcrit_alarm Voltage critical low alarm. From VOLTAGE_UV_FAULT status.
in1_crit_alarm Voltage critical high alarm. From VOLTAGE_OV_FAULT status.
+in1_highest Historical maximum voltage.
+in1_reset_history Write any value to reset history.
curr1_label "iout1"
curr1_input Measured current. From READ_IOUT register.
@@ -57,6 +59,8 @@ curr1_max Maximum current. From IOUT_OC_WARN_LIMIT register.
curr1_crit Critical maximum current. From IOUT_OC_FAULT_LIMIT register.
curr1_max_alarm Current high alarm. From IOUT_OC_WARN_LIMIT register.
curr1_crit_alarm Current critical high alarm. From IOUT_OC_FAULT status.
+curr1_highest Historical maximum current.
+curr1_reset_history Write any value to reset history.
temp1_input Measured temperature. From READ_TEMPERATURE_1 register.
temp1_max Maximum temperature. From OT_WARN_LIMIT register.
@@ -67,3 +71,5 @@ temp1_max_alarm Chip temperature high alarm. Set by comparing
temp1_crit_alarm Chip temperature critical high alarm. Set by comparing
READ_TEMPERATURE_1 with OT_FAULT_LIMIT if TEMP_OT_FAULT
status is set.
+temp1_highest Historical maximum temperature.
+temp1_reset_history Write any value to reset history.
diff --git a/drivers/hwmon/pmbus/max8688.c b/drivers/hwmon/pmbus/max8688.c
index ddc8a64..c3e72f1 100644
--- a/drivers/hwmon/pmbus/max8688.c
+++ b/drivers/hwmon/pmbus/max8688.c
@@ -25,6 +25,9 @@
#include <linux/i2c.h>
#include "pmbus.h"
+#define MAX8688_MFR_VOUT_PEAK 0xd4
+#define MAX8688_MFR_IOUT_PEAK 0xd5
+#define MAX8688_MFR_TEMPERATURE_PEAK 0xd6
#define MAX8688_MFG_STATUS 0xd8
#define MAX8688_STATUS_OC_FAULT (1 << 4)
@@ -37,6 +40,62 @@
#define MAX8688_STATUS_OT_FAULT (1 << 13)
#define MAX8688_STATUS_OT_WARNING (1 << 14)
+static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
+{
+ int ret;
+
+ if (page)
+ return -EINVAL;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_VOUT_MAX:
+ ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
+ break;
+ case PMBUS_VIRT_READ_IOUT_MAX:
+ ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
+ break;
+ case PMBUS_VIRT_READ_TEMP_MAX:
+ ret = pmbus_read_word_data(client, 0,
+ MAX8688_MFR_TEMPERATURE_PEAK);
+ break;
+ case PMBUS_VIRT_RESET_VOUT_HISTORY:
+ case PMBUS_VIRT_RESET_IOUT_HISTORY:
+ case PMBUS_VIRT_RESET_TEMP_HISTORY:
+ ret = 0;
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
+static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
+ u16 word)
+{
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_RESET_VOUT_HISTORY:
+ ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
+ 0);
+ break;
+ case PMBUS_VIRT_RESET_IOUT_HISTORY:
+ ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
+ 0);
+ break;
+ case PMBUS_VIRT_RESET_TEMP_HISTORY:
+ ret = pmbus_write_word_data(client, 0,
+ MAX8688_MFR_TEMPERATURE_PEAK,
+ 0xffff);
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
{
int ret = 0;
@@ -111,6 +170,8 @@ static struct pmbus_driver_info max8688_info = {
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_STATUS_TEMP,
.read_byte_data = max8688_read_byte_data,
+ .read_word_data = max8688_read_word_data,
+ .write_word_data = max8688_write_word_data,
};
static int max8688_probe(struct i2c_client *client,
--
1.7.3.1
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