From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/power/reset/gpio-poweroff.c | 109 ++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 drivers/power/reset/gpio-poweroff.c

(limited to 'drivers/power/reset/gpio-poweroff.c')

diff --git a/drivers/power/reset/gpio-poweroff.c b/drivers/power/reset/gpio-poweroff.c
new file mode 100644
index 000000000..1c5af2fef
--- /dev/null
+++ b/drivers/power/reset/gpio-poweroff.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Toggles a GPIO pin to power down a device
+ *
+ * Jamie Lentin <jm@lentin.co.uk>
+ * Andrew Lunn <andrew@lunn.ch>
+ *
+ * Copyright (C) 2012 Jamie Lentin
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/of_platform.h>
+#include <linux/module.h>
+
+#define DEFAULT_TIMEOUT_MS 3000
+/*
+ * Hold configuration here, cannot be more than one instance of the driver
+ * since pm_power_off itself is global.
+ */
+static struct gpio_desc *reset_gpio;
+static u32 timeout = DEFAULT_TIMEOUT_MS;
+static u32 active_delay = 100;
+static u32 inactive_delay = 100;
+
+static void gpio_poweroff_do_poweroff(void)
+{
+	BUG_ON(!reset_gpio);
+
+	/* drive it active, also inactive->active edge */
+	gpiod_direction_output(reset_gpio, 1);
+	mdelay(active_delay);
+
+	/* drive inactive, also active->inactive edge */
+	gpiod_set_value_cansleep(reset_gpio, 0);
+	mdelay(inactive_delay);
+
+	/* drive it active, also inactive->active edge */
+	gpiod_set_value_cansleep(reset_gpio, 1);
+
+	/* give it some time */
+	mdelay(timeout);
+
+	WARN_ON(1);
+}
+
+static int gpio_poweroff_probe(struct platform_device *pdev)
+{
+	bool input = false;
+	enum gpiod_flags flags;
+
+	/* If a pm_power_off function has already been added, leave it alone */
+	if (pm_power_off != NULL) {
+		dev_err(&pdev->dev,
+			"%s: pm_power_off function already registered\n",
+		       __func__);
+		return -EBUSY;
+	}
+
+	input = device_property_read_bool(&pdev->dev, "input");
+	if (input)
+		flags = GPIOD_IN;
+	else
+		flags = GPIOD_OUT_LOW;
+
+	device_property_read_u32(&pdev->dev, "active-delay-ms", &active_delay);
+	device_property_read_u32(&pdev->dev, "inactive-delay-ms",
+				 &inactive_delay);
+	device_property_read_u32(&pdev->dev, "timeout-ms", &timeout);
+
+	reset_gpio = devm_gpiod_get(&pdev->dev, NULL, flags);
+	if (IS_ERR(reset_gpio))
+		return PTR_ERR(reset_gpio);
+
+	pm_power_off = &gpio_poweroff_do_poweroff;
+	return 0;
+}
+
+static int gpio_poweroff_remove(struct platform_device *pdev)
+{
+	if (pm_power_off == &gpio_poweroff_do_poweroff)
+		pm_power_off = NULL;
+
+	return 0;
+}
+
+static const struct of_device_id of_gpio_poweroff_match[] = {
+	{ .compatible = "gpio-poweroff", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, of_gpio_poweroff_match);
+
+static struct platform_driver gpio_poweroff_driver = {
+	.probe = gpio_poweroff_probe,
+	.remove = gpio_poweroff_remove,
+	.driver = {
+		.name = "poweroff-gpio",
+		.of_match_table = of_gpio_poweroff_match,
+	},
+};
+
+module_platform_driver(gpio_poweroff_driver);
+
+MODULE_AUTHOR("Jamie Lentin <jm@lentin.co.uk>");
+MODULE_DESCRIPTION("GPIO poweroff driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:poweroff-gpio");
-- 
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