On 08/07/2013 12:27 AM, 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 | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++
[...]
+ if (!data->lm90_reg) {
+ data->lm90_reg = regulator_get(&client->dev, "vdd");
+ if (IS_ERR_OR_NULL(data->lm90_reg)) {
+ if (PTR_ERR(data->lm90_reg) == -ENODEV)
+ dev_info(&client->dev,
+ "No regulator found for vdd. Assuming vdd is always powered.");
+ else
+ dev_warn(&client->dev,
+ "Error [%ld] in getting the regulator handle for vdd.\n",
+ PTR_ERR(data->lm90_reg));
+ data->lm90_reg = NULL;
+ mutex_unlock(&data->update_lock);
+ return -ENODEV;
+ }
+ }
+ if (is_enable) {
+ ret = regulator_enable(data->lm90_reg);
+ msleep(POWER_ON_DELAY);
Can this delay be handled directly from regulator?
Good question. Browsing through other regulator_enable calls,
I don't see a similar delay anywhere else, so one should assume
that this is not necessary.
Guenter
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