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feat(kernel/pca963x): implement power management #24

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41 changes: 41 additions & 0 deletions drivers/leds/leds-pca963x.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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 */
Expand Down Expand Up @@ -362,6 +363,45 @@ 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", },
Expand Down Expand Up @@ -412,6 +452,7 @@ 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,
Expand Down