linux-kernel - [PATCH 1/3] leds: pca9532: Use PWM1 for hardware blinking

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Date: Mon, 27 May 2024 14:59:38 +0200
From: Bastien Curutchet <bastien.curutchet@...tlin.com>
To: Riku Voipio <riku.voipio@....fi>,
	Pavel Machek <pavel@....cz>,
	Lee Jones <lee@...nel.org>
Cc: linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	herve.codina@...tlin.com,
	christophercordahi@...ometrics.ca,
	Bastien Curutchet <bastien.curutchet@...tlin.com>
Subject: [PATCH 1/3] leds: pca9532: Use PWM1 for hardware blinking

PSC0/PWM0 are used by all leds for brightness and blinking. This causes
conflicts when you set a brightness of a new led while an other one is
already using PWM0 for blinking.

Use PSC1/PWM1 for blinking.
Check that no other led is already blinking with a different PSC1/PWM1
configuration to avoid conflict.

Signed-off-by: Bastien Curutchet <bastien.curutchet@...tlin.com>
---
 drivers/leds/leds-pca9532.c | 49 ++++++++++++++++++++++++++++++-------
 1 file changed, 40 insertions(+), 9 deletions(-)

diff --git a/drivers/leds/leds-pca9532.c b/drivers/leds/leds-pca9532.c
index bf8bb8fc007c..c210608ad336 100644
--- a/drivers/leds/leds-pca9532.c
+++ b/drivers/leds/leds-pca9532.c
@@ -191,29 +191,60 @@ static int pca9532_set_brightness(struct led_classdev *led_cdev,
 	return err;
 }
 
+static int pca9532_update_hw_blink(struct pca9532_led *led,
+				   unsigned long delay_on, unsigned long delay_off)
+{
+	struct pca9532_data *data = i2c_get_clientdata(led->client);
+	unsigned int psc;
+	int i;
+
+	/* Look for others leds that already use PWM1 */
+	for (i = 0; i < data->chip_info->num_leds; i++) {
+		struct pca9532_led *other = &data->leds[i];
+
+		if (other == led)
+			continue;
+		if (other->state == PCA9532_PWM1) {
+			if (other->ldev.blink_delay_on != delay_on ||
+			    other->ldev.blink_delay_off != delay_off) {
+				dev_dbg(&led->client->dev,
+					"HW can handle only one blink configuration at a time\n");
+				return -EINVAL;
+			}
+		}
+	}
+
+	psc = ((delay_on + delay_off) * 152 - 1) / 1000;
+	if (psc > 255) {
+		dev_dbg(&led->client->dev, "Blink period too long to be handled by hardware\n");
+		return -EINVAL;
+	}
+
+	data->psc[1] = psc;
+	data->pwm[1] = (delay_on * 255) / (delay_on + delay_off);
+
+	return pca9532_setpwm(data->client, 1);
+}
+
 static int pca9532_set_blink(struct led_classdev *led_cdev,
 	unsigned long *delay_on, unsigned long *delay_off)
 {
 	struct pca9532_led *led = ldev_to_led(led_cdev);
 	struct i2c_client *client = led->client;
-	int psc;
-	int err = 0;
+	struct pca9532_data *data = i2c_get_clientdata(client);
+	int err;
 
 	if (*delay_on == 0 && *delay_off == 0) {
 		/* led subsystem ask us for a blink rate */
 		*delay_on = 1000;
 		*delay_off = 1000;
 	}
-	if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6)
-		return -EINVAL;
 
-	/* Thecus specific: only use PSC/PWM 0 */
-	psc = (*delay_on * 152-1)/1000;
-	err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
+	led->state = PCA9532_PWM1;
+	err = pca9532_update_hw_blink(led, *delay_on, *delay_off);
 	if (err)
 		return err;
-	if (led->state == PCA9532_PWM0)
-		pca9532_setpwm(led->client, 0);
+
 	pca9532_setled(led);
 
 	return 0;
-- 
2.44.0