hwmon: (max16064) Add support for peak attributes

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

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

2 files changed, 55 insertions, 0 deletions

diff --git a/Documentation/hwmon/max16064 b/Documentation/hwmon/max16064
index 41728999e142..f6e8bcbfaccf 100644
--- a/Documentation/hwmon/max16064
+++ b/Documentation/hwmon/max16064
@@ -50,6 +50,8 @@ in[1-4]_min_alarm	Voltage low alarm. From VOLTAGE_UV_WARNING status.
 in[1-4]_max_alarm       Voltage high alarm. From VOLTAGE_OV_WARNING status.
 in[1-4]_lcrit_alarm     Voltage critical low alarm. From VOLTAGE_UV_FAULT status.
 in[1-4]_crit_alarm      Voltage critical high alarm. From VOLTAGE_OV_FAULT status.
+in[1-4]_highest         Historical maximum voltage.
+in[1-4]_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.
@@ -60,3 +62,5 @@ 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/max16064.c b/drivers/hwmon/pmbus/max16064.c
index 78e20bca53a9..e50b296e8db4 100644
--- a/drivers/hwmon/pmbus/max16064.c
+++ b/drivers/hwmon/pmbus/max16064.c
@@ -25,6 +25,55 @@
 #include <linux/i2c.h>
 #include "pmbus.h"
 
+#define MAX16064_MFR_VOUT_PEAK          0xd4
+#define MAX16064_MFR_TEMPERATURE_PEAK   0xd6
+
+static int max16064_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,
+                                           MAX16064_MFR_VOUT_PEAK);
+                break;
+        case PMBUS_VIRT_READ_TEMP_MAX:
+                ret = pmbus_read_word_data(client, page,
+                                           MAX16064_MFR_TEMPERATURE_PEAK);
+                break;
+        case PMBUS_VIRT_RESET_VOUT_HISTORY:
+        case PMBUS_VIRT_RESET_TEMP_HISTORY:
+                ret = 0;
+                break;
+        default:
+                ret = -ENODATA;
+                break;
+        }
+        return ret;
+}
+
+static int max16064_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,
+                                            MAX16064_MFR_VOUT_PEAK, 0);
+                break;
+        case PMBUS_VIRT_RESET_TEMP_HISTORY:
+                ret = pmbus_write_word_data(client, page,
+                                            MAX16064_MFR_TEMPERATURE_PEAK,
+                                            0xffff);
+                break;
+        default:
+                ret = -ENODATA;
+                break;
+        }
+        return ret;
+}
+
 static struct pmbus_driver_info max16064_info = {
         .pages = 4,
         .format[PSC_VOLTAGE_IN] = direct,
@@ -44,6 +93,8 @@ static struct pmbus_driver_info max16064_info = {
         .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
         .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
         .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
+        .read_word_data = max16064_read_word_data,
+        .write_word_data = max16064_write_word_data,
 };
 
 static int max16064_probe(struct i2c_client *client,