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authorGuenter Roeck <guenter.roeck@ericsson.com>2012-04-09 13:53:00 -0400
committerGuenter Roeck <guenter.roeck@ericsson.com>2012-04-18 11:15:50 -0700
commit1196573fe493aeeb826468157313ee84ffbc59f3 (patch)
treeef8edd1050f0c66f5d5e0f7a859506a652f29c3a /drivers/hwmon
parent00250ec90963b7ef6678438888f3244985ecde14 (diff)
downloadlinux-1196573fe493aeeb826468157313ee84ffbc59f3.tar.bz2
hwmon: (ads1015) Fix build warning
The following build warning is seen in some configurations. drivers/hwmon/ads1015.c: In function 'show_in': drivers/hwmon/ads1015.c:129: warning: 'in' may be used uninitialized in this function Fix by separating the register read function from the code converting the result into mV. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Cc: Dirk Eibach <eibach@gdsys.de> Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/ads1015.c33
1 files changed, 16 insertions, 17 deletions
diff --git a/drivers/hwmon/ads1015.c b/drivers/hwmon/ads1015.c
index 7765e4f74ec5..1958f03efd7a 100644
--- a/drivers/hwmon/ads1015.c
+++ b/drivers/hwmon/ads1015.c
@@ -59,14 +59,11 @@ struct ads1015_data {
struct ads1015_channel_data channel_data[ADS1015_CHANNELS];
};
-static int ads1015_read_value(struct i2c_client *client, unsigned int channel,
- int *value)
+static int ads1015_read_adc(struct i2c_client *client, unsigned int channel)
{
u16 config;
- s16 conversion;
struct ads1015_data *data = i2c_get_clientdata(client);
unsigned int pga = data->channel_data[channel].pga;
- int fullscale;
unsigned int data_rate = data->channel_data[channel].data_rate;
unsigned int conversion_time_ms;
int res;
@@ -78,7 +75,6 @@ static int ads1015_read_value(struct i2c_client *client, unsigned int channel,
if (res < 0)
goto err_unlock;
config = res;
- fullscale = fullscale_table[pga];
conversion_time_ms = DIV_ROUND_UP(1000, data_rate_table[data_rate]);
/* setup and start single conversion */
@@ -105,33 +101,36 @@ static int ads1015_read_value(struct i2c_client *client, unsigned int channel,
}
res = i2c_smbus_read_word_swapped(client, ADS1015_CONVERSION);
- if (res < 0)
- goto err_unlock;
- conversion = res;
-
- mutex_unlock(&data->update_lock);
-
- *value = DIV_ROUND_CLOSEST(conversion * fullscale, 0x7ff0);
-
- return 0;
err_unlock:
mutex_unlock(&data->update_lock);
return res;
}
+static int ads1015_reg_to_mv(struct i2c_client *client, unsigned int channel,
+ s16 reg)
+{
+ struct ads1015_data *data = i2c_get_clientdata(client);
+ unsigned int pga = data->channel_data[channel].pga;
+ int fullscale = fullscale_table[pga];
+
+ return DIV_ROUND_CLOSEST(reg * fullscale, 0x7ff0);
+}
+
/* sysfs callback function */
static ssize_t show_in(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct i2c_client *client = to_i2c_client(dev);
- int in;
int res;
+ int index = attr->index;
- res = ads1015_read_value(client, attr->index, &in);
+ res = ads1015_read_adc(client, index);
+ if (res < 0)
+ return res;
- return (res < 0) ? res : sprintf(buf, "%d\n", in);
+ return sprintf(buf, "%d\n", ads1015_reg_to_mv(client, index, res));
}
static const struct sensor_device_attribute ads1015_in[] = {