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| author | Javier Martinez Canillas <javier.martinez@collabora.co.uk> | 2014-07-04 22:24:05 +0200 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2014-07-21 16:54:27 +0100 |
| commit | 2b52b5d5f25108739954f0c544dfe72f08a3aacc (patch) | |
| tree | 2b99a30619f13ae2220c46e39c80af5d48629036 /drivers/mfd/max77686.c | |
| parent | 6f1c1e71d933f58a6248f1681aededdd407f32a8 (diff) | |
| download | lwn-2b52b5d5f25108739954f0c544dfe72f08a3aacc.tar.gz lwn-2b52b5d5f25108739954f0c544dfe72f08a3aacc.zip | |
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: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd/max77686.c')
| -rw-r--r-- | drivers/mfd/max77686.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c index 3cb41d02cd3d..a38e9ee1a0d9 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, |