hwmon: (lm75) Add support for writing sampling period on PCT2075

For PCT7027, the sampling period is configured using a dedicated
register.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index ce0f6c6..d45e5cc 100644 (file)
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -95,6 +95,7 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
 #define LM75_REG_CONF          0x01
 #define LM75_REG_HYST          0x02
 #define LM75_REG_MAX           0x03
+#define PCT2075_REG_IDLE       0x04
 
 /* Each client has this additional data */
 struct lm75_data {
@@ -199,6 +200,11 @@ static const struct lm75_params device_params[] = {
        [pct2075] = {
                .default_resolution = 11,
                .default_sample_time = MSEC_PER_SEC / 10,
+               .num_sample_times = 31,
+               .sample_times = (unsigned int []){ 100, 200, 300, 400, 500, 600,
+               700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700,
+               1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700,
+               2800, 2900, 3000, 3100 },
        },
        [mcp980x] = {
                .set_mask = 3 << 5,     /* 12-bit mode */
@@ -422,6 +428,13 @@ static int lm75_update_interval(struct device *dev, long val)
                        return err;
                data->sample_time = data->params->sample_times[index];
                break;
+       case pct2075:
+               err = i2c_smbus_write_byte_data(data->client, PCT2075_REG_IDLE,
+                                               index + 1);
+               if (err)
+                       return err;
+               data->sample_time = data->params->sample_times[index];
+               break;
        }
        return 0;
 }
@@ -512,7 +525,7 @@ static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg)
 static const struct regmap_config lm75_regmap_config = {
        .reg_bits = 8,
        .val_bits = 16,
-       .max_register = LM75_REG_MAX,
+       .max_register = PCT2075_REG_IDLE,
        .writeable_reg = lm75_is_writeable_reg,
        .volatile_reg = lm75_is_volatile_reg,
        .val_format_endian = REGMAP_ENDIAN_BIG,