hwmon: (max8688) 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>

diff --git a/Documentation/hwmon/max8688 b/Documentation/hwmon/max8688
index 0ddd3a4120306331864c8678a5a83f1c95cd3465..71ed10a3c94e7d6ad63db3ccd5edbd054d38ec60 100644 (file)
--- 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 ddc8a64c2ba5ae4119e54b973fbe2f4c7867db79..c3e72f1a3cfb1fa0493dd92c373c2608338a5a0f 100644 (file)
--- 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,