On Sun, 10 Dec 2023, Amitesh Singh wrote:
> From a22dbd7390ce875e81d67f14f05f593d7f03d5c1 Mon Sep 17 00:00:00 2001
> From: Amitesh Singh <singh.amitesh@xxxxxxxxx>
> Date: Fri, 8 Dec 2023 15:08:33 +0530
> Subject: [PATCH] feat(kernel/pca963x): implement power management
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> This implements power management in upstream driver
> for pca9633 which enables device sleep and resume
> on system-wide sleep/hibernation
>
> Signed-off-by: Amitesh Singh <singh.amitesh@xxxxxxxxx>
> ---
> drivers/leds/leds-pca963x.c | 41 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 41 insertions(+)
>
> diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
> index 47223c850e4b..462f917dc986 100644
> --- a/drivers/leds/leds-pca963x.c
> +++ b/drivers/leds/leds-pca963x.c
> @@ -39,6 +39,7 @@
> #define PCA963X_LED_PWM 0x2 /* Controlled through PWM */
> #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_INVRT 0x10 /* Normal or inverted direction */
> #define PCA963X_MODE2_DMBLNK 0x20 /* Enable blinking */
> @@ -380,6 +381,45 @@ static int pca963x_register_leds(struct i2c_client
> *client,
> return ret;
> }
>
> +#ifdef CONFIG_PM
> +static int pca963x_suspend(struct device *dev)
> +{
> + struct pca963x *chip;
> + u8 reg;
> +
> + chip = dev_get_drvdata(dev);
> +
> + reg = i2c_smbus_read_byte_data(chip->client, PCA963X_MODE1);
> + reg = reg | (1 << 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;
> + u8 reg;
> +
> + chip = dev_get_drvdata(dev);
> +
> + reg = i2c_smbus_read_byte_data(chip->client, PCA963X_MODE1);
> + reg = reg & ~(1 << PCA963X_MODE1_SLEEP);
> + i2c_smbus_write_byte_data(chip->client, PCA963X_MODE1, reg);
> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops pca963x_pmops = {
> + SET_SYSTEM_SLEEP_PM_OPS(pca963x_suspend, pca963x_resume)
> +};
> +
> +#define PCA963X_SMBUS_PMOPS (&pca963x_pmops)
> +
> +#else
> +#define PCA963X_SMBUS_PMOPS NULL
> +#endif
> +
> static const struct of_device_id of_pca963x_match[] = {
> { .compatible = "nxp,pca9632", },
> { .compatible = "nxp,pca9633", },
> @@ -430,6 +470,7 @@ static struct i2c_driver pca963x_driver = {
> .driver = {
> .name = "leds-pca963x",
> .of_match_table = of_pca963x_match,
> + .pm = PCA963X_SMBUS_PMOPS
> },
> .probe = pca963x_probe,
> .id_table = pca963x_id,
> --
> 2.43.0
>
--
Lee Jones [李琼斯]
