Messages in this thread Patch in this message | | | Date | Sun, 10 Dec 2023 17:16:52 +0530 | From | Amitesh Singh <> | Subject | [PATCH] feat(kernel/pca963x): implement power management |
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From a22dbd7390ce875e81d67f14f05f593d7f03d5c1 Mon Sep 17 00:00:00 2001 From: Amitesh Singh <singh.amitesh@gmail.com> Date: Fri, 8 Dec 2023 15:08:33 +0530 Subject: [PATCH] feat(kernel/pca963x): implement power management
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@gmail.com> --- 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
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