diff options
| author |   Iker Perez del Palomar Sustatxa <iker.perez@codethink.co.uk> | 2019-08-08 09:02:44 +0100 |
|---|---|---|
| committer |   Guenter Roeck <linux@roeck-us.net> | 2019-09-03 12:47:17 -0700 |
| commit | 58608cfee861788aaaf8c1de5c4250ac4151eafd (patch) | |
| tree | 4bd3636039614a30c4406f48ea451e14d670b603 /drivers/hwmon | |
| parent | hwmon: (lm75) Create structure to save all the configuration parameters. (diff) | |
| download | linux-dev-58608cfee861788aaaf8c1de5c4250ac4151eafd.tar.xz linux-dev-58608cfee861788aaaf8c1de5c4250ac4151eafd.zip | |
hwmon: (lm75) Create function from code to write into registers
Wrap the existing code to write configurations into registers in
a function.
Added error handling to the function.
Signed-off-by: Iker Perez del Palomar Sustatxa <iker.perez@codethink.co.uk>
Link: https://lore.kernel.org/r/20190808080246.8371-3-iker.perez@codethink.co.uk
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/lm75.c | 34 |
1 files changed, 27 insertions, 7 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index e65d1f41b616..4acf4a71a30b 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -235,6 +235,27 @@ static inline long lm75_reg_to_mc(s16 temp, u8 resolution) return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8); } +static int lm75_write_config(struct lm75_data *data, u8 set_mask, + u8 clr_mask) +{ + u8 value; + + clr_mask |= LM75_SHUTDOWN; + value = data->current_conf & ~clr_mask; + value |= set_mask; + + if (data->current_conf != value) { + s32 err; + + err = i2c_smbus_write_byte_data(data->client, LM75_REG_CONF, + value); + if (err) + return err; + data->current_conf = value; + } + return 0; +} + static int lm75_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { @@ -396,7 +417,6 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) struct device *hwmon_dev; struct lm75_data *data; int status, err; - int new; enum lm75_type kind; if (client->dev.of_node) @@ -436,16 +456,16 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) return status; } data->orig_conf = status; - new = status & ~(data->params->clr_mask | LM75_SHUTDOWN); - new |= data->params->set_mask; - if (status != new) - i2c_smbus_write_byte_data(client, LM75_REG_CONF, new); + data->current_conf = status; - err = devm_add_action_or_reset(dev, lm75_remove, data); + err = lm75_write_config(data, data->params->set_mask, + data->params->clr_mask); if (err) return err; - dev_dbg(dev, "Config %02x\n", new); + err = devm_add_action_or_reset(dev, lm75_remove, data); + if (err) + return err; hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, &lm75_chip_info, |