On pią, 2014-07-04 at 11:55 +0200, Javier Martinez Canillas wrote:
> The driver doesn't have PM operations defined so add a suspend
> and resume function handlers to allow the PMIC IRQ to wakeup
> the system when it is put into a sleep state.
>
> Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
> ---
> drivers/mfd/max77686.c | 40 ++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 40 insertions(+)
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Best regards,
Krzysztof
> diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c
> index 3cb41d0..a38e9ee 100644
> --- a/drivers/mfd/max77686.c
> +++ b/drivers/mfd/max77686.c
> @@ -240,10 +240,50 @@ static const struct i2c_device_id max77686_i2c_id[] = {
> };
> MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
>
> +#ifdef CONFIG_PM_SLEEP
> +static int max77686_suspend(struct device *dev)
> +{
> + struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
> + struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
> +
> + if (device_may_wakeup(dev))
> + enable_irq_wake(max77686->irq);
> +
> + /*
> + * IRQ must be disabled during suspend because if it happens
> + * while suspended it will be handled before resuming I2C.
> + *
> + * When device is woken up from suspend (e.g. by RTC wake alarm),
> + * an interrupt occurs before resuming I2C bus controller.
> + * Interrupt handler tries to read registers but this read
> + * will fail because I2C is still suspended.
> + */
> + disable_irq(max77686->irq);
> +
> + return 0;
> +}
> +
> +static int max77686_resume(struct device *dev)
> +{
> + struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
> + struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
> +
> + if (device_may_wakeup(dev))
> + disable_irq_wake(max77686->irq);
> +
> + enable_irq(max77686->irq);
> +
> + return 0;
> +}
> +#endif /* CONFIG_PM_SLEEP */
> +
> +static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume);
> +
> static struct i2c_driver max77686_i2c_driver = {
> .driver = {
> .name = "max77686",
> .owner = THIS_MODULE,
> + .pm = &max77686_pm,
> .of_match_table = of_match_ptr(max77686_pmic_dt_match),
> },
> .probe = max77686_i2c_probe,
--
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