Turn off LEDS on suspend and put device in low power state, and restore
settings on resume.
Cc: Tony Lindgren <tony@xxxxxxxxxxx>
Cc: Richard Purdie <rpurdie@xxxxxxxxx>
Cc: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
---
drivers/leds/leds-pca963x.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
index 407eba11e187..4840bdaa1b48 100644
--- a/drivers/leds/leds-pca963x.c
+++ b/drivers/leds/leds-pca963x.c
@@ -382,6 +382,7 @@ static int pca963x_probe(struct i2c_client *client,
pca963x[i].led_cdev.name = pca963x[i].name;
pca963x[i].led_cdev.brightness_set_blocking = pca963x_led_set;
+ pca963x[i].led_cdev.flags = LED_CORE_SUSPENDRESUME;
if (pdata && pdata->blink_type == PCA963X_HW_BLINK)
pca963x[i].led_cdev.blink_set = pca963x_blink_set;
@@ -422,10 +423,40 @@ static int pca963x_remove(struct i2c_client *client)
return 0;
}
+static int pca963x_set_power(struct i2c_client *client, bool state)
+{
+ return i2c_smbus_write_byte_data(client, PCA963X_MODE1,
+ state ? 0 : BIT(4));
+}
+
+static int pca963x_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ return pca963x_set_power(client, false);
+}
+
+static int pca963x_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int ret;
+
+ ret = pca963x_set_power(client, true);
+
+ /* wait for oscillator enabling */
+ if (!ret)
+ usleep_range(500, 1000);
+
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(pca963x_pm, pca963x_suspend, pca963x_resume);
+
static struct i2c_driver pca963x_driver = {
.driver = {
.name = "leds-pca963x",
.of_match_table = of_match_ptr(of_pca963x_match),
+ .pm = &pca963x_pm,
},
.probe = pca963x_probe,
.remove = pca963x_remove,
--
2.7.4
--
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