[PATCH v8 10/13] rtc: max77686: Allow the max77686 rtc to wakeup the system

Javier Martinez Canillas
2014-07-14T11:44:48Z

From: Doug Anderson <dianders@chromium.org>

The max77686 includes an RTC that keeps power during suspend. It's
convenient to be able to use it as a wakeup source.

NOTE: due to wakeup ordering problems this patch alone doesn't work so
well on exynos5250-snow. You also need something that brings the i2c
bus up before the max77686 wakeup runs.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---

Changes since v6: None

Changes since v5:
- Fix $SUBJECT since the patch does not actually touch the mfd subsys.
Suggested by Lee Jones.

Changes since v4: None

Changes since v3:
- Keep the note that this patch needs another change due wakeup
ordering problems.
---
drivers/rtc/rtc-max77686.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
index d20a7f0..c1c6055 100644
--- a/drivers/rtc/rtc-max77686.c
+++ b/drivers/rtc/rtc-max77686.c
@@ -583,6 +583,33 @@ static void max77686_rtc_shutdown(struct platform_device *pdev)
#endif /* MAX77686_RTC_WTSR_SMPL */
}

+#ifdef CONFIG_PM_SLEEP
+static int max77686_rtc_suspend(struct device *dev)
+{
+ if (device_may_wakeup(dev)) {
+ struct max77686_rtc_info *info = dev_get_drvdata(dev);
+
+ return enable_irq_wake(info->virq);
+ }
+
+ return 0;
+}
+
+static int max77686_rtc_resume(struct device *dev)
+{
+ if (device_may_wakeup(dev)) {
+ struct max77686_rtc_info *info = dev_get_drvdata(dev);
+
+ return disable_irq_wake(info->virq);
+ }
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(max77686_rtc_pm_ops,
+ max77686_rtc_suspend, max77686_rtc_resume);
+
static const struct platform_device_id rtc_id[] = {
{ "max77686-rtc", 0 },
{},
@@ -592,6 +619,7 @@ static struct platform_driver max77686_rtc_driver = {
.driver = {
.name = "max77686-rtc",
.owner = THIS_MODULE,
+ .pm = &max77686_rtc_pm_ops,
},
.probe = max77686_rtc_probe,
.shutdown = max77686_rtc_shutdown,
--
2.0.0.rc2