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>

1 files changed, 61 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/max8688.c b/drivers/hwmon/pmbus/max8688.c
index ddc8a64c2ba5..c3e72f1a3cfb 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,