diff options
Diffstat (limited to 'drivers/hwmon/ads1015.c')
| -rw-r--r-- | drivers/hwmon/ads1015.c | 33 |
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[] = { |
