hwmon: (max34440) Add support for peak attributes

Add support for voltage, current, and temperature peak (historic maximum)
attributes.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>

diff --git a/Documentation/hwmon/max34440 b/Documentation/hwmon/max34440
index 6c525dd..8ab5153 100644 (file)
--- a/Documentation/hwmon/max34440
+++ b/Documentation/hwmon/max34440
@@ -56,6 +56,8 @@ 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]_highest                Historical maximum voltage.
+in[1-6]_reset_history  Write any value to reset history.
 
 curr[1-6]_label                "iout[1-6]".
 curr[1-6]_input                Measured current. From READ_IOUT register.
@@ -63,6 +65,8 @@ curr[1-6]_max         Maximum current. From IOUT_OC_WARN_LIMIT register.
 curr[1-6]_crit         Critical maximum current. From IOUT_OC_FAULT_LIMIT register.
 curr[1-6]_max_alarm    Current high alarm. From IOUT_OC_WARNING status.
 curr[1-6]_crit_alarm   Current critical high alarm. From IOUT_OC_FAULT status.
+curr[1-6]_highest      Historical maximum current.
+curr[1-6]_reset_history        Write any value to reset history.
 
                        in6 and curr6 attributes only exist for MAX34440.
 
@@ -75,5 +79,7 @@ temp[1-8]_max         Maximum temperature. From OT_WARN_LIMIT register.
 temp[1-8]_crit         Critical high temperature. From OT_FAULT_LIMIT register.
 temp[1-8]_max_alarm    Temperature high alarm.
 temp[1-8]_crit_alarm   Temperature critical high alarm.
+temp[1-8]_highest      Historical maximum temperature.
+temp[1-8]_reset_history        Write any value to reset history.
 
                        temp7 and temp8 attributes only exist for MAX34440.

diff --git a/drivers/hwmon/pmbus/max34440.c b/drivers/hwmon/pmbus/max34440.c
index 2e30046..fda621d 100644 (file)
--- a/drivers/hwmon/pmbus/max34440.c
+++ b/drivers/hwmon/pmbus/max34440.c
@@ -27,11 +27,70 @@
 
 enum chips { max34440, max34441 };
 
+#define MAX34440_MFR_VOUT_PEAK         0xd4
+#define MAX34440_MFR_IOUT_PEAK         0xd5
+#define MAX34440_MFR_TEMPERATURE_PEAK  0xd6
+
 #define MAX34440_STATUS_OC_WARN                (1 << 0)
 #define MAX34440_STATUS_OC_FAULT       (1 << 1)
 #define MAX34440_STATUS_OT_FAULT       (1 << 5)
 #define MAX34440_STATUS_OT_WARN                (1 << 6)
 
+static int max34440_read_word_data(struct i2c_client *client, int page, int reg)
+{
+       int ret;
+
+       switch (reg) {
+       case PMBUS_VIRT_READ_VOUT_MAX:
+               ret = pmbus_read_word_data(client, page,
+                                          MAX34440_MFR_VOUT_PEAK);
+               break;
+       case PMBUS_VIRT_READ_IOUT_MAX:
+               ret = pmbus_read_word_data(client, page,
+                                          MAX34440_MFR_IOUT_PEAK);
+               break;
+       case PMBUS_VIRT_READ_TEMP_MAX:
+               ret = pmbus_read_word_data(client, page,
+                                          MAX34440_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 max34440_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, page,
+                                           MAX34440_MFR_VOUT_PEAK, 0);
+               break;
+       case PMBUS_VIRT_RESET_IOUT_HISTORY:
+               ret = pmbus_write_word_data(client, page,
+                                           MAX34440_MFR_IOUT_PEAK, 0);
+               break;
+       case PMBUS_VIRT_RESET_TEMP_HISTORY:
+               ret = pmbus_write_word_data(client, page,
+                                           MAX34440_MFR_TEMPERATURE_PEAK,
+                                           0xffff);
+               break;
+       default:
+               ret = -ENODATA;
+               break;
+       }
+       return ret;
+}
+
 static int max34440_read_byte_data(struct i2c_client *client, int page, int reg)
 {
        int ret;
@@ -109,6 +168,8 @@ static struct pmbus_driver_info max34440_info[] = {
                .func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
                .func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
                .read_byte_data = max34440_read_byte_data,
+               .read_word_data = max34440_read_word_data,
+               .write_word_data = max34440_write_word_data,
        },
        [max34441] = {
                .pages = 12,
@@ -150,6 +211,8 @@ static struct pmbus_driver_info max34440_info[] = {
                .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
                .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
                .read_byte_data = max34440_read_byte_data,
+               .read_word_data = max34440_read_word_data,
+               .write_word_data = max34440_write_word_data,
        },
 };