Allow chip to enter low power state when no LEDs are being lit or in
blink mode.
Cc: Tony Lindgren <tony@xxxxxxxxxxx>
Cc: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
---
Changes from v1:
* remove runtime pm
* count leds that are off, if all then enter low-power state
drivers/leds/leds-pca963x.c | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)
diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
index 407eba11e187..797dffc42c59 100644
--- a/drivers/leds/leds-pca963x.c
+++ b/drivers/leds/leds-pca963x.c
@@ -179,14 +179,32 @@ static void pca963x_blink(struct pca963x_led *pca963x)
mutex_unlock(&pca963x->chip->mutex);
}
+static int pca963x_power_state(struct pca963x_led *pca963x)
+{
+ int i, leds_on = 0;
+
+ for (i = 0; i < pca963x->chip->chipdef->n_leds; i++) {
+ if (pca963x->chip->leds[i].led_cdev.brightness > 0)
+ leds_on++;
+ }
+
+ return i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE1,
+ leds_on ? 0 : BIT(4));
+}
+
static int pca963x_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct pca963x_led *pca963x;
+ int ret;
pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);
- return pca963x_brightness(pca963x, value);
+ ret = pca963x_brightness(pca963x, value);
+ if (ret < 0)
+ return ret;
+
+ return pca963x_power_state(pca963x);
}
static int pca963x_blink_set(struct led_classdev *led_cdev,
@@ -391,8 +409,8 @@ static int pca963x_probe(struct i2c_client *client,
goto exit;
}
- /* Disable LED all-call address and set normal mode */
- i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00);
+ /* Disable LED all-call address, and power down initially */
+ i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4));
if (pdata) {
/* Configure output: open-drain or totem pole (push-pull) */
--
2.7.4
--
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