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>

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),