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    Subject[PATCH] Add low_power support for adm1021 driver.
    Resending this patch previously sent some months again.

    Occasionally it is helpful to be able to turn a temperature sensor off
    (for example if it's making unwanted electrical noise). This patch
    adds a sysfs node to put any adm1021 compatible device into low power mode.

    Signed-off-by: Michael Abbott <michael.abbott@diamond.ac.uk>
    ---
    drivers/hwmon/adm1021.c | 33 +++++++++++++++++++++++++++++++++
    1 files changed, 33 insertions(+), 0 deletions(-)

    diff --git a/drivers/hwmon/adm1021.c b/drivers/hwmon/adm1021.c
    index de84398..39434e1 100644
    --- a/drivers/hwmon/adm1021.c
    +++ b/drivers/hwmon/adm1021.c
    @@ -83,6 +83,7 @@ struct adm1021_data {

    struct mutex update_lock;
    char valid; /* !=0 if following fields are valid */
    + char low_power; /* !=0 if device in low power mode */
    unsigned long last_updated; /* In jiffies */

    int temp_max[2]; /* Register values */
    @@ -213,6 +214,35 @@ static ssize_t set_temp_min(struct device *dev,
    return count;
    }

    +static ssize_t show_low_power(
    + struct device *dev, struct device_attribute *devattr, char *buf)
    +{
    + struct adm1021_data *data = adm1021_update_device(dev);
    + return sprintf(buf, "%d\n", data->low_power);
    +}
    +
    +static ssize_t set_low_power(
    + struct device *dev, struct device_attribute *devattr,
    + const char *buf, size_t count)
    +{
    + struct i2c_client *client = to_i2c_client(dev);
    + struct adm1021_data *data = i2c_get_clientdata(client);
    + int low_power = simple_strtol(buf, NULL, 10) != 0;
    + mutex_lock(&data->update_lock);
    +
    + if (low_power != data->low_power) {
    + int config = i2c_smbus_read_byte_data(
    + client, ADM1021_REG_CONFIG_R);
    + data->low_power = low_power;
    + i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
    + (config & 0xBF) | (low_power << 6));
    + }
    + mutex_unlock(&data->update_lock);
    +
    + return count;
    +}
    +
    +
    static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
    static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
    set_temp_max, 0);
    @@ -230,6 +260,8 @@ static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
    static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);

    static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
    +static DEVICE_ATTR(
    + low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power);

    static struct attribute *adm1021_attributes[] = {
    &sensor_dev_attr_temp1_max.dev_attr.attr,
    @@ -244,6 +276,7 @@ static struct attribute *adm1021_attributes[] = {
    &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
    &sensor_dev_attr_temp2_fault.dev_attr.attr,
    &dev_attr_alarms.attr,
    + &dev_attr_low_power.attr,
    NULL
    };

    --
    1.6.1.3


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