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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>
This commit is contained in:
Matt Ranostay 2016-10-28 18:20:42 -07:00 committed by Jacek Anaszewski
parent 90a5537bd8
commit a8c170b015
1 changed files with 33 additions and 7 deletions
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40
drivers/leds/leds-pca963x.c
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@ -103,6 +103,7 @@ struct pca963x {
struct mutex mutex; struct mutex mutex;
struct i2c_client *client; struct i2c_client *client;
struct pca963x_led *leds; struct pca963x_led *leds;
unsigned long leds_on;
}; };
struct pca963x_led { struct pca963x_led {
@ -124,7 +125,6 @@ static int pca963x_brightness(struct pca963x_led *pca963x,
u8 mask = 0x3 << shift; u8 mask = 0x3 << shift;
int ret; int ret;
mutex_lock(&pca963x->chip->mutex);
ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr); ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
switch (brightness) { switch (brightness) {
case LED_FULL: case LED_FULL:
@ -141,14 +141,13 @@ static int pca963x_brightness(struct pca963x_led *pca963x,
PCA963X_PWM_BASE + pca963x->led_num, PCA963X_PWM_BASE + pca963x->led_num,
brightness); brightness);
if (ret < 0) if (ret < 0)
goto unlock; return ret;
ret = i2c_smbus_write_byte_data(pca963x->chip->client, ret = i2c_smbus_write_byte_data(pca963x->chip->client,
ledout_addr, ledout_addr,
(ledout & ~mask) | (PCA963X_LED_PWM << shift)); (ledout & ~mask) | (PCA963X_LED_PWM << shift));
break; break;
} }
unlock:
mutex_unlock(&pca963x->chip->mutex);
return ret; return ret;
} }
@ -180,14 +179,41 @@ static void pca963x_blink(struct pca963x_led *pca963x)
mutex_unlock(&pca963x->chip->mutex); mutex_unlock(&pca963x->chip->mutex);
} }
static int pca963x_power_state(struct pca963x_led *pca963x)
{
unsigned long *leds_on = &pca963x->chip->leds_on;
unsigned long cached_leds = pca963x->chip->leds_on;
if (pca963x->led_cdev.brightness)
set_bit(pca963x->led_num, leds_on);
else
clear_bit(pca963x->led_num, leds_on);
if (!(*leds_on) != !cached_leds)
return i2c_smbus_write_byte_data(pca963x->chip->client,
PCA963X_MODE1, *leds_on ? 0 : BIT(4));
return 0;
}
static int pca963x_led_set(struct led_classdev *led_cdev, static int pca963x_led_set(struct led_classdev *led_cdev,
enum led_brightness value) enum led_brightness value)
{ {
struct pca963x_led *pca963x; struct pca963x_led *pca963x;
int ret;
pca963x = container_of(led_cdev, struct pca963x_led, led_cdev); pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);
return pca963x_brightness(pca963x, value); mutex_lock(&pca963x->chip->mutex);
ret = pca963x_brightness(pca963x, value);
if (ret < 0)
goto unlock;
ret = pca963x_power_state(pca963x);
unlock:
mutex_unlock(&pca963x->chip->mutex);
return ret;
} }
static unsigned int pca963x_period_scale(struct pca963x_led *pca963x, static unsigned int pca963x_period_scale(struct pca963x_led *pca963x,
@ -403,8 +429,8 @@ static int pca963x_probe(struct i2c_client *client,
goto exit; goto exit;
} }
/* Disable LED all-call address and set normal mode */ /* Disable LED all-call address, and power down initially */
i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00); i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4));
if (pdata) { if (pdata) {
/* Configure output: open-drain or totem pole (push-pull) */ /* Configure output: open-drain or totem pole (push-pull) */