diff options
Diffstat (limited to 'drivers/hwmon/powr1220.c')
| -rw-r--r-- | drivers/hwmon/powr1220.c | 17 |
1 files changed, 4 insertions, 13 deletions
diff --git a/drivers/hwmon/powr1220.c b/drivers/hwmon/powr1220.c index 5f9ca6543530..06a2c56016d1 100644 --- a/drivers/hwmon/powr1220.c +++ b/drivers/hwmon/powr1220.c @@ -16,7 +16,6 @@ #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> -#include <linux/mutex.h> #include <linux/delay.h> #define ADC_STEP_MV 2 @@ -75,7 +74,6 @@ enum powr1220_adc_values { struct powr1220_data { struct i2c_client *client; - struct mutex update_lock; u8 max_channels; bool adc_valid[MAX_POWR1220_ADC_VALUES]; /* the next value is in jiffies */ @@ -111,8 +109,6 @@ static int powr1220_read_adc(struct device *dev, int ch_num) int result; int adc_range = 0; - mutex_lock(&data->update_lock); - if (time_after(jiffies, data->adc_last_updated[ch_num] + HZ) || !data->adc_valid[ch_num]) { /* @@ -128,8 +124,8 @@ static int powr1220_read_adc(struct device *dev, int ch_num) /* set the attenuator and mux */ result = i2c_smbus_write_byte_data(data->client, ADC_MUX, adc_range | ch_num); - if (result) - goto exit; + if (result < 0) + return result; /* * wait at least Tconvert time (200 us) for the @@ -140,14 +136,14 @@ static int powr1220_read_adc(struct device *dev, int ch_num) /* get the ADC reading */ result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_LOW); if (result < 0) - goto exit; + return result; reading = result >> 4; /* get the upper half of the reading */ result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_HIGH); if (result < 0) - goto exit; + return result; reading |= result << 4; @@ -163,10 +159,6 @@ static int powr1220_read_adc(struct device *dev, int ch_num) } else { result = data->adc_values[ch_num]; } - -exit: - mutex_unlock(&data->update_lock); - return result; } @@ -302,7 +294,6 @@ static int powr1220_probe(struct i2c_client *client) break; } - mutex_init(&data->update_lock); data->client = client; hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, |