On 08/08/2013 03:13 PM, Alexander Shiyan wrote:
>> The device lm90 can be controlled by the vdd rail.
>> Adding the power control support to power on/off the vdd rail.
>> And make sure that power is enabled before accessing the device.
>>
>> Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
>> ---
>> drivers/hwmon/lm90.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 49 insertions(+)
>>
>> diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
> [...]
>> +static void lm90_power_control(struct i2c_client *client, bool is_enable)
>> +{
>> + struct lm90_data *data = i2c_get_clientdata(client);
>> + int ret;
>> +
>> + if (!data->lm90_reg)
>> + return;
>> +
>> + mutex_lock(&data->update_lock);
>> +
>> + if (is_enable)
>> + ret = regulator_enable(data->lm90_reg);
>> + else
>> + ret = regulator_disable(data->lm90_reg);
>> +
>> + if (ret < 0)
>> + dev_err(&client->dev,
>> + "Error in %s rail vdd, error %d\n",
>> + (is_enable) ? "enabling" : "disabling", ret);
>> + else
>> + dev_info(&client->dev, "success in %s rail vdd\n",
>> + (is_enable) ? "enabling" : "disabling");
>
> dev_dbg() ?
As Guenter said, I will remove these messages, and remove this function,
the code will be more clean.
>
>> +
>> + mutex_unlock(&data->update_lock);
>> +}
>> +
>> static int lm90_probe(struct i2c_client *client,
>> const struct i2c_device_id *id)
>> {
>> @@ -1406,6 +1434,20 @@ static int lm90_probe(struct i2c_client *client,
>> i2c_set_clientdata(client, data);
>> mutex_init(&data->update_lock);
>>
>> + data->lm90_reg = regulator_get(&client->dev, "vdd");
>> + if (IS_ERR_OR_NULL(data->lm90_reg)) {
>
> What about deferred probe?
> if (PTR_ERR(data->lm90_reg) == -EPROBE_DEFER)
> return -EPROBE_DEFER;
Oh, yes, I should add it.
>
>> + if (PTR_ERR(data->lm90_reg) == -ENODEV)
>> + dev_info(&client->dev,
>> + "No regulator found for vdd. Assuming vdd is always powered.");
>
> On my opinion it is unnecessary message.
>
>> + else
>> + dev_warn(&client->dev,
>> + "Error [%ld] in getting the regulator handle for vdd.\n",
>> + PTR_ERR(data->lm90_reg));
>
> Ditto.
I will remove these log messages.
>
>> + data->lm90_reg = NULL;
>
> You can just use !IS_ERR(data->lm90_reg) macro in the future,
> rather than set this to NULL.
Yes, it's better, I will do it.
>
> [...]
>
> ---
>
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