[PATCH 2/4] hwmon: (lm75) Create function from code to write into registers

From: Iker Perez
Date: Tue Aug 06 2019 - 05:11:45 EST


From: Iker Perez del Palomar Sustatxa <iker.perez@xxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxx>
---
drivers/hwmon/lm75.c | 34 +++++++++++++++++++++++++++-------
1 file changed, 27 insertions(+), 7 deletions(-)

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 1c012301b6ca..477ac0732ddf 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -228,6 +228,27 @@ 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)
{
@@ -389,7 +410,6 @@ 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)
@@ -429,16 +449,16 @@ 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,
--
2.11.0