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leds: pca963x: Add support for suspend and resume

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This implements power management for pca9633 which enables
device sleep and resume on system-wide sleep/hibernation

Signed-off-by: Amitesh Singh <singh.amitesh@gmail.com>
Link: https://lore.kernel.org/r/20240203162524.343936-1-singh.amitesh@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Amitesh Singh 2024-02-03 21:55:24 +05:30 committed by Lee Jones
parent 9225333e48
commit 46f02b681b
1 changed files with 28 additions and 0 deletions
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28
drivers/leds/leds-pca963x.c
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@ -39,6 +39,7 @@
#define PCA963X_LED_PWM 0x2 /* Controlled through PWM */ #define PCA963X_LED_PWM 0x2 /* Controlled through PWM */
#define PCA963X_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */ #define PCA963X_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */
#define PCA963X_MODE1_SLEEP 0x04 /* Normal mode or Low Power mode, oscillator off */
#define PCA963X_MODE2_OUTDRV 0x04 /* Open-drain or totem pole */ #define PCA963X_MODE2_OUTDRV 0x04 /* Open-drain or totem pole */
#define PCA963X_MODE2_INVRT 0x10 /* Normal or inverted direction */ #define PCA963X_MODE2_INVRT 0x10 /* Normal or inverted direction */
#define PCA963X_MODE2_DMBLNK 0x20 /* Enable blinking */ #define PCA963X_MODE2_DMBLNK 0x20 /* Enable blinking */
@ -380,6 +381,32 @@ err:
return ret; return ret;
} }
static int pca963x_suspend(struct device *dev)
{
struct pca963x *chip = dev_get_drvdata(dev);
u8 reg;
reg = i2c_smbus_read_byte_data(chip->client, PCA963X_MODE1);
reg = reg | BIT(PCA963X_MODE1_SLEEP);
i2c_smbus_write_byte_data(chip->client, PCA963X_MODE1, reg);
return 0;
}
static int pca963x_resume(struct device *dev)
{
struct pca963x *chip = dev_get_drvdata(dev);
u8 reg;
reg = i2c_smbus_read_byte_data(chip->client, PCA963X_MODE1);
reg = reg & ~BIT(PCA963X_MODE1_SLEEP);
i2c_smbus_write_byte_data(chip->client, PCA963X_MODE1, reg);
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(pca963x_pm, pca963x_suspend, pca963x_resume);
static const struct of_device_id of_pca963x_match[] = { static const struct of_device_id of_pca963x_match[] = {
{ .compatible = "nxp,pca9632", }, { .compatible = "nxp,pca9632", },
{ .compatible = "nxp,pca9633", }, { .compatible = "nxp,pca9633", },
@ -430,6 +457,7 @@ static struct i2c_driver pca963x_driver = {
.driver = { .driver = {
.name = "leds-pca963x", .name = "leds-pca963x",
.of_match_table = of_pca963x_match, .of_match_table = of_pca963x_match,
.pm = pm_sleep_ptr(&pca963x_pm)
}, },
.probe = pca963x_probe, .probe = pca963x_probe,
.id_table = pca963x_id, .id_table = pca963x_id,