openwrt/target/linux/bcm27xx/patches-6.6/950-1072-regulator-rpi-panel-Power-off-display-on-shutdown.patch

From a02f1a28cf74e9593e5b2e1c18fe0cbe6cc59e42 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Thu, 25 Apr 2024 17:13:05 +0100
Subject: [PATCH 1072/1085] regulator/rpi-panel: Power off display on shutdown

Adds a shutdown function to turn off the backlight, bridge, and
touch controller on shutdown.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/regulator/rpi-panel-attiny-regulator.c | 9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/regulator/rpi-panel-attiny-regulator.c
+++ b/drivers/regulator/rpi-panel-attiny-regulator.c
@@ -370,6 +370,14 @@ static void attiny_i2c_remove(struct i2c
 	mutex_destroy(&state->lock);
 }
 
+static void attiny_i2c_shutdown(struct i2c_client *client)
+{
+	struct attiny_lcd *state = i2c_get_clientdata(client);
+
+	regmap_write(state->regmap, REG_PWM, 0);
+	regmap_write(state->regmap, REG_POWERON, 0);
+}
+
 static const struct of_device_id attiny_dt_ids[] = {
 	{ .compatible = "raspberrypi,7inch-touchscreen-panel-regulator" },
 	{},
@@ -384,6 +392,7 @@ static struct i2c_driver attiny_regulato
 	},
 	.probe = attiny_i2c_probe,
 	.remove	= attiny_i2c_remove,
+	.shutdown = attiny_i2c_shutdown,
 };
 
 module_i2c_driver(attiny_regulator_driver);