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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>
alistair/sunxi64-5.4-dsi
Iker Perez del Palomar Sustatxa 2019-08-08 09:02:44 +01:00 committed by Guenter Roeck
parent dcb1265387
commit 58608cfee8
1 changed files with 27 additions and 7 deletions
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34
drivers/hwmon/lm75.c
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@ -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)
@ -436,17 +456,17 @@ 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 = lm75_write_config(data, data->params->set_mask,
data->params->clr_mask);
if (err)
return err;
err = devm_add_action_or_reset(dev, lm75_remove, data);
if (err)
return err;
dev_dbg(dev, "Config %02x\n", new);
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
data, &lm75_chip_info,
NULL);