diff options
Diffstat (limited to 'drivers/hwmon/adt7470.c')
| -rw-r--r-- | drivers/hwmon/adt7470.c | 56 |
1 files changed, 48 insertions, 8 deletions
diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c index b7a442a80bde..ab8d5ebc9f75 100644 --- a/drivers/hwmon/adt7470.c +++ b/drivers/hwmon/adt7470.c @@ -129,8 +129,8 @@ I2C_CLIENT_INSMOD_1(adt7470); /* How often do we reread sensor limit values? (In jiffies) */ #define LIMIT_REFRESH_INTERVAL (60 * HZ) -/* sleep 1s while gathering temperature data */ -#define TEMP_COLLECTION_TIME 1000 +/* Wait at least 200ms per sensor for 10 sensors */ +#define TEMP_COLLECTION_TIME 2000 /* datasheet says to divide this number by the fan reading to get fan rpm */ #define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x)) @@ -147,6 +147,8 @@ struct adt7470_data { unsigned long sensors_last_updated; /* In jiffies */ unsigned long limits_last_updated; /* In jiffies */ + int num_temp_sensors; /* -1 = probe */ + s8 temp[ADT7470_TEMP_COUNT]; s8 temp_min[ADT7470_TEMP_COUNT]; s8 temp_max[ADT7470_TEMP_COUNT]; @@ -256,12 +258,10 @@ static struct adt7470_data *adt7470_update_device(struct device *dev) cfg |= 0x80; i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg); - /* - * Delay is 200ms * number of tmp05 sensors. Too bad - * there's no way to figure out how many are connected. - * For now, assume 1s will work. - */ - msleep(TEMP_COLLECTION_TIME); + /* Delay is 200ms * number of temp sensors. */ + msleep((data->num_temp_sensors >= 0 ? + data->num_temp_sensors * 200 : + TEMP_COLLECTION_TIME)); /* done reading temperature sensors */ cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG); @@ -276,6 +276,12 @@ static struct adt7470_data *adt7470_update_device(struct device *dev) data->temp[i] = i2c_smbus_read_byte_data(client, ADT7470_TEMP_REG(i)); + /* Figure out the number of temp sensors */ + if (data->num_temp_sensors < 0) + for (i = 0; i < ADT7470_TEMP_COUNT; i++) + if (data->temp[i]) + data->num_temp_sensors = i + 1; + for (i = 0; i < ADT7470_FAN_COUNT; i++) data->fan[i] = adt7470_read_word_data(client, ADT7470_REG_FAN(i)); @@ -359,6 +365,35 @@ out: return data; } +static ssize_t show_num_temp_sensors(struct device *dev, + struct device_attribute *devattr, + char *buf) +{ + struct adt7470_data *data = adt7470_update_device(dev); + return sprintf(buf, "%d\n", data->num_temp_sensors); +} + +static ssize_t set_num_temp_sensors(struct device *dev, + struct device_attribute *devattr, + const char *buf, + size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct adt7470_data *data = i2c_get_clientdata(client); + long temp; + + if (strict_strtol(buf, 10, &temp)) + return -EINVAL; + + temp = SENSORS_LIMIT(temp, -1, 10); + + mutex_lock(&data->lock); + data->num_temp_sensors = temp; + mutex_unlock(&data->lock); + + return count; +} + static ssize_t show_temp_min(struct device *dev, struct device_attribute *devattr, char *buf) @@ -825,6 +860,8 @@ static ssize_t show_alarm(struct device *dev, } static DEVICE_ATTR(alarm_mask, S_IRUGO, show_alarm_mask, NULL); +static DEVICE_ATTR(num_temp_sensors, S_IWUSR | S_IRUGO, show_num_temp_sensors, + set_num_temp_sensors); static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max, 0); @@ -997,6 +1034,7 @@ static SENSOR_DEVICE_ATTR(pwm4_auto_channels_temp, S_IWUSR | S_IRUGO, static struct attribute *adt7470_attr[] = { &dev_attr_alarm_mask.attr, + &dev_attr_num_temp_sensors.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp2_max.dev_attr.attr, &sensor_dev_attr_temp3_max.dev_attr.attr, @@ -1129,6 +1167,8 @@ static int adt7470_probe(struct i2c_client *client, goto exit; } + data->num_temp_sensors = -1; + i2c_set_clientdata(client, data); mutex_init(&data->lock); |