diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/tmp421.c | 44 |
1 files changed, 38 insertions, 6 deletions
diff --git a/drivers/hwmon/tmp421.c b/drivers/hwmon/tmp421.c index 4f3737d14ade..776464820a3d 100644 --- a/drivers/hwmon/tmp421.c +++ b/drivers/hwmon/tmp421.c @@ -33,6 +33,9 @@ enum chips { tmp421, tmp422, tmp423, tmp441, tmp442 }; /* The TMP421 registers */ #define TMP421_STATUS_REG 0x08 #define TMP421_CONFIG_REG_1 0x09 +#define TMP421_CONFIG_REG_2 0x0A +#define TMP421_CONFIG_REG_REN(x) (BIT(3 + (x))) +#define TMP421_CONFIG_REG_REN_MASK GENMASK(6, 3) #define TMP421_CONVERSION_RATE_REG 0x0B #define TMP421_N_FACTOR_REG_1 0x21 #define TMP421_MANUFACTURER_ID_REG 0xFE @@ -162,6 +165,34 @@ exit: return 0; } +static int tmp421_enable_channels(struct tmp421_data *data) +{ + int err; + struct i2c_client *client = data->client; + struct device *dev = &client->dev; + int old = i2c_smbus_read_byte_data(client, TMP421_CONFIG_REG_2); + int new, i; + + if (old < 0) { + dev_err(dev, "error reading register, can't disable channels\n"); + return old; + } + + new = old & ~TMP421_CONFIG_REG_REN_MASK; + for (i = 0; i < data->channels; i++) + if (data->channel[i].enabled) + new |= TMP421_CONFIG_REG_REN(i); + + if (new == old) + return 0; + + err = i2c_smbus_write_byte_data(client, TMP421_CONFIG_REG_2, new); + if (err < 0) + dev_err(dev, "error writing register, can't disable channels\n"); + + return err; +} + static int tmp421_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { @@ -217,9 +248,10 @@ static umode_t tmp421_is_visible(const void *data, enum hwmon_sensor_types type, } } -static int tmp421_init_client(struct i2c_client *client) +static int tmp421_init_client(struct tmp421_data *data) { int config, config_orig; + struct i2c_client *client = data->client; /* Set the conversion rate to 2 Hz */ i2c_smbus_write_byte_data(client, TMP421_CONVERSION_RATE_REG, 0x05); @@ -240,7 +272,7 @@ static int tmp421_init_client(struct i2c_client *client) i2c_smbus_write_byte_data(client, TMP421_CONFIG_REG_1, config); } - return 0; + return tmp421_enable_channels(data); } static int tmp421_detect(struct i2c_client *client, @@ -391,10 +423,6 @@ static int tmp421_probe(struct i2c_client *client) data->channels = i2c_match_id(tmp421_id, client)->driver_data; data->client = client; - err = tmp421_init_client(client); - if (err) - return err; - for (i = 0; i < data->channels; i++) { data->temp_config[i] = HWMON_T_INPUT | HWMON_T_FAULT; data->channel[i].enabled = true; @@ -404,6 +432,10 @@ static int tmp421_probe(struct i2c_client *client) if (err) return err; + err = tmp421_init_client(data); + if (err) + return err; + data->chip.ops = &tmp421_ops; data->chip.info = data->info; |