diff mbox series

leds/pca963x: implement power management

Message ID 20240116073421.395547-1-singh.amitesh@gmail.com
State New
Headers
Series leds/pca963x: implement power management |

Commit Message

Amitesh Singh Jan. 16, 2024, 7:34 a.m. UTC 
  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 | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

Comments

Lee Jones Jan. 25, 2024, 1:30 p.m. UTC | #1 
On Tue, 16 Jan 2024, Amitesh Singh wrote:

> 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 | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)

Same review comments as before.
Amitesh Singh Jan. 29, 2024, 11:32 a.m. UTC | #2 
On Thu, Jan 25, 2024 at 7:00 PM Lee Jones <lee@kernel.org> wrote:
>
> On Tue, 16 Jan 2024, Amitesh Singh wrote:
>
> > 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 | 34 ++++++++++++++++++++++++++++++++++
> >  1 file changed, 34 insertions(+)
>
> Same review comments as before.
>

Thanks for reviewing it. I've updated the patch and sent it with v2 in
the subject line.

> --
> Lee Jones [李琼斯]
diff mbox series

Patch

diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
index 47223c850e4b..a5804989d756 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 +381,38 @@  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;
+	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;
+}
+#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 +463,7 @@  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,