diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/adt7470.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c index da6c9306ca5f..b7a442a80bde 100644 --- a/drivers/hwmon/adt7470.c +++ b/drivers/hwmon/adt7470.c @@ -74,6 +74,7 @@ I2C_CLIENT_INSMOD_1(adt7470); #define ADT7470_REG_PWM12_CFG 0x68 #define ADT7470_PWM2_AUTO_MASK 0x40 #define ADT7470_PWM1_AUTO_MASK 0x80 +#define ADT7470_PWM_AUTO_MASK 0xC0 #define ADT7470_REG_PWM34_CFG 0x69 #define ADT7470_PWM3_AUTO_MASK 0x40 #define ADT7470_PWM4_AUTO_MASK 0x80 @@ -223,7 +224,7 @@ static struct adt7470_data *adt7470_update_device(struct device *dev) struct i2c_client *client = to_i2c_client(dev); struct adt7470_data *data = i2c_get_clientdata(client); unsigned long local_jiffies = jiffies; - u8 cfg; + u8 cfg, pwm[4], pwm_cfg[2]; int i; mutex_lock(&data->lock); @@ -232,6 +233,24 @@ static struct adt7470_data *adt7470_update_device(struct device *dev) && data->sensors_valid) goto no_sensor_update; + /* save pwm[1-4] config register */ + pwm_cfg[0] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(0)); + pwm_cfg[1] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(2)); + + /* set manual pwm to whatever it is set to now */ + for (i = 0; i < ADT7470_FAN_COUNT; i++) + pwm[i] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM(i)); + + /* put pwm in manual mode */ + i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0), + pwm_cfg[0] & ~(ADT7470_PWM_AUTO_MASK)); + i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2), + pwm_cfg[1] & ~(ADT7470_PWM_AUTO_MASK)); + + /* write pwm control to whatever it was */ + for (i = 0; i < ADT7470_FAN_COUNT; i++) + i2c_smbus_write_byte_data(client, ADT7470_REG_PWM(i), pwm[i]); + /* start reading temperature sensors */ cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG); cfg |= 0x80; @@ -249,6 +268,10 @@ static struct adt7470_data *adt7470_update_device(struct device *dev) cfg &= ~0x80; i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg); + /* restore pwm[1-4] config registers */ + i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0), pwm_cfg[0]); + i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2), pwm_cfg[1]); + for (i = 0; i < ADT7470_TEMP_COUNT; i++) data->temp[i] = i2c_smbus_read_byte_data(client, ADT7470_TEMP_REG(i)); |
