From: Amitesh Singh <singh.amitesh@gmail.com>
To: pavel@ucw.cz, lee@kernel.org, linux-leds@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Amitesh Singh <singh.amitesh@gmail.com>
Subject: [PATCH v2] leds/pca963x: implement power management
Date: Mon, 29 Jan 2024 16:45:05 +0530 [thread overview]
Message-ID: <20240129111505.196068-1-singh.amitesh@gmail.com> (raw)
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>
---
drivers/leds/leds-pca963x.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
index 47223c850e4b..227f24ba2ca2 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 +381,34 @@ static int pca963x_register_leds(struct i2c_client *client,
return ret;
}
+#ifdef CONFIG_PM_SLEEP
+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;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pca963x_pm, pca963x_suspend, pca963x_resume);
+
static const struct of_device_id of_pca963x_match[] = {
{ .compatible = "nxp,pca9632", },
{ .compatible = "nxp,pca9633", },
@@ -430,6 +459,7 @@ static struct i2c_driver pca963x_driver = {
.driver = {
.name = "leds-pca963x",
.of_match_table = of_pca963x_match,
+ .pm = &pca963x_pm
},
.probe = pca963x_probe,
.id_table = pca963x_id,
--
2.43.0
next reply other threads:[~2024-01-29 11:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-29 11:15 Amitesh Singh [this message]
2024-02-02 12:36 ` [PATCH v2] leds/pca963x: implement power management Lee Jones
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