| Message ID | 1404467722-26687-3-git-send-email-javier.martinez@collabora.co.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On pi?, 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@collabora.co.uk> > --- > drivers/mfd/max77686.c | 40 ++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 40 insertions(+) Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> 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,
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,
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@collabora.co.uk> --- drivers/mfd/max77686.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+)