mfd: Handle the ab8500 irq for suspend/resume

Ensure that the AB interrupt is only handled at a time when
all core drivers are resumed. Ensure that the AB interrupt
is marked as a wakeup interrupt.

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Reviewed-by: Jonas Aberg <jonas.aberg@stericsson.com>
Reviewed-by: Mattias Wallin <mattias.wallin@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/mfd/ab8500-i2c.c b/drivers/mfd/ab8500-i2c.c
index b83045f102be..89b31a3409cd 100644
--- a/drivers/mfd/ab8500-i2c.c
+++ b/drivers/mfd/ab8500-i2c.c
@@ -101,10 +101,42 @@ static const struct platform_device_id ab8500_id[] = {
         { }
 };
 
+#ifdef CONFIG_PM
+static int ab8500_i2c_suspend(struct device *dev)
+{
+        struct ab8500 *ab = dev_get_drvdata(dev);
+
+        disable_irq(ab->irq);
+        enable_irq_wake(ab->irq);
+
+        return 0;
+}
+
+static int ab8500_i2c_resume(struct device *dev)
+{
+        struct ab8500 *ab = dev_get_drvdata(dev);
+
+        disable_irq_wake(ab->irq);
+        enable_irq(ab->irq);
+
+        return 0;
+}
+
+static const struct dev_pm_ops ab8500_i2c_pm_ops = {
+        .suspend        = ab8500_i2c_suspend,
+        .resume         = ab8500_i2c_resume,
+};
+
+#define AB8500_I2C_PM_OPS       (&ab8500_i2c_pm_ops)
+#else
+#define AB8500_I2C_PM_OPS       NULL
+#endif
+
 static struct platform_driver ab8500_i2c_driver = {
         .driver = {
                 .name = "ab8500-i2c",
                 .owner = THIS_MODULE,
+                .pm     = AB8500_I2C_PM_OPS,
         },
         .probe  = ab8500_i2c_probe,
         .remove = __devexit_p(ab8500_i2c_remove),