Commit 2b52b5d5 authored by Javier Martinez Canillas's avatar Javier Martinez Canillas Committed by Lee Jones

mfd: max77686: Add power management support

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: default avatarJavier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 6f1c1e71
...@@ -240,10 +240,50 @@ static const struct i2c_device_id max77686_i2c_id[] = { ...@@ -240,10 +240,50 @@ static const struct i2c_device_id max77686_i2c_id[] = {
}; };
MODULE_DEVICE_TABLE(i2c, 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 = { static struct i2c_driver max77686_i2c_driver = {
.driver = { .driver = {
.name = "max77686", .name = "max77686",
.owner = THIS_MODULE, .owner = THIS_MODULE,
.pm = &max77686_pm,
.of_match_table = of_match_ptr(max77686_pmic_dt_match), .of_match_table = of_match_ptr(max77686_pmic_dt_match),
}, },
.probe = max77686_i2c_probe, .probe = max77686_i2c_probe,
......
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