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>

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,