leds: pca963x: enable low-power state
Allow chip to enter low power state when no LEDs are being lit or in blink mode. Cc: Peter Meerwald <p.meerwald@bct-electronic.com>, Cc: Ricardo Ribalda <ricardo.ribalda@gmail.com> Cc: Tony Lindgren <tony@atomide.com> Signed-off-by: Matt Ranostay <matt@ranostay.consulting> Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
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@ -103,6 +103,7 @@ struct pca963x {
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struct mutex mutex;
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struct i2c_client *client;
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struct pca963x_led *leds;
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unsigned long leds_on;
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};
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struct pca963x_led {
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@ -124,7 +125,6 @@ static int pca963x_brightness(struct pca963x_led *pca963x,
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u8 mask = 0x3 << shift;
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int ret;
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mutex_lock(&pca963x->chip->mutex);
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ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
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switch (brightness) {
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case LED_FULL:
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@ -141,14 +141,13 @@ static int pca963x_brightness(struct pca963x_led *pca963x,
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PCA963X_PWM_BASE + pca963x->led_num,
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brightness);
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if (ret < 0)
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goto unlock;
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return ret;
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ret = i2c_smbus_write_byte_data(pca963x->chip->client,
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ledout_addr,
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(ledout & ~mask) | (PCA963X_LED_PWM << shift));
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break;
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}
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unlock:
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mutex_unlock(&pca963x->chip->mutex);
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return ret;
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}
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@ -180,14 +179,41 @@ static void pca963x_blink(struct pca963x_led *pca963x)
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mutex_unlock(&pca963x->chip->mutex);
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}
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static int pca963x_power_state(struct pca963x_led *pca963x)
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{
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unsigned long *leds_on = &pca963x->chip->leds_on;
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unsigned long cached_leds = pca963x->chip->leds_on;
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if (pca963x->led_cdev.brightness)
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set_bit(pca963x->led_num, leds_on);
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else
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clear_bit(pca963x->led_num, leds_on);
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if (!(*leds_on) != !cached_leds)
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return i2c_smbus_write_byte_data(pca963x->chip->client,
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PCA963X_MODE1, *leds_on ? 0 : BIT(4));
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return 0;
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}
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static int pca963x_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct pca963x_led *pca963x;
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int ret;
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pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);
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return pca963x_brightness(pca963x, value);
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mutex_lock(&pca963x->chip->mutex);
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ret = pca963x_brightness(pca963x, value);
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if (ret < 0)
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goto unlock;
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ret = pca963x_power_state(pca963x);
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unlock:
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mutex_unlock(&pca963x->chip->mutex);
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return ret;
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}
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static unsigned int pca963x_period_scale(struct pca963x_led *pca963x,
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@ -403,8 +429,8 @@ static int pca963x_probe(struct i2c_client *client,
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goto exit;
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}
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/* Disable LED all-call address and set normal mode */
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i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00);
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/* Disable LED all-call address, and power down initially */
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i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4));
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if (pdata) {
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/* Configure output: open-drain or totem pole (push-pull) */
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