1 files changed, 142 insertions, 0 deletions
diff --git a/drivers/power/reset/gpio-restart.c b/drivers/power/reset/gpio-restart.c
new file mode 100644
index 000000000..5466eeea2
--- /dev/null
+++ b/drivers/power/reset/gpio-restart.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Toggles a GPIO pin to restart a device
+ *
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * Based on the gpio-poweroff driver.
+ */
+#include <linux/reboot.h>
+#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>
+
+struct gpio_restart {
+	struct gpio_desc *reset_gpio;
+	struct notifier_block restart_handler;
+	u32 active_delay_ms;
+	u32 inactive_delay_ms;
+	u32 wait_delay_ms;
+};
+
+static int gpio_restart_notify(struct notifier_block *this,
+				unsigned long mode, void *cmd)
+{
+	struct gpio_restart *gpio_restart =
+		container_of(this, struct gpio_restart, restart_handler);
+
+	/* drive it active, also inactive->active edge */
+	gpiod_direction_output(gpio_restart->reset_gpio, 1);
+	mdelay(gpio_restart->active_delay_ms);
+
+	/* drive inactive, also active->inactive edge */
+	gpiod_set_value(gpio_restart->reset_gpio, 0);
+	mdelay(gpio_restart->inactive_delay_ms);
+
+	/* drive it active, also inactive->active edge */
+	gpiod_set_value(gpio_restart->reset_gpio, 1);
+
+	/* give it some time */
+	mdelay(gpio_restart->wait_delay_ms);
+
+	WARN_ON(1);
+
+	return NOTIFY_DONE;
+}
+
+static int gpio_restart_probe(struct platform_device *pdev)
+{
+	struct gpio_restart *gpio_restart;
+	bool open_source = false;
+	u32 property;
+	int ret;
+
+	gpio_restart = devm_kzalloc(&pdev->dev, sizeof(*gpio_restart),
+			GFP_KERNEL);
+	if (!gpio_restart)
+		return -ENOMEM;
+
+	open_source = of_property_read_bool(pdev->dev.of_node, "open-source");
+
+	gpio_restart->reset_gpio = devm_gpiod_get(&pdev->dev, NULL,
+			open_source ? GPIOD_IN : GPIOD_OUT_LOW);
+	ret = PTR_ERR_OR_ZERO(gpio_restart->reset_gpio);
+	if (ret) {
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Could not get reset GPIO\n");
+		return ret;
+	}
+
+	gpio_restart->restart_handler.notifier_call = gpio_restart_notify;
+	gpio_restart->restart_handler.priority = 129;
+	gpio_restart->active_delay_ms = 100;
+	gpio_restart->inactive_delay_ms = 100;
+	gpio_restart->wait_delay_ms = 3000;
+
+	ret = of_property_read_u32(pdev->dev.of_node, "priority", &property);
+	if (!ret) {
+		if (property > 255)
+			dev_err(&pdev->dev, "Invalid priority property: %u\n",
+					property);
+		else
+			gpio_restart->restart_handler.priority = property;
+	}
+
+	of_property_read_u32(pdev->dev.of_node, "active-delay",
+			&gpio_restart->active_delay_ms);
+	of_property_read_u32(pdev->dev.of_node, "inactive-delay",
+			&gpio_restart->inactive_delay_ms);
+	of_property_read_u32(pdev->dev.of_node, "wait-delay",
+			&gpio_restart->wait_delay_ms);
+
+	platform_set_drvdata(pdev, gpio_restart);
+
+	ret = register_restart_handler(&gpio_restart->restart_handler);
+	if (ret) {
+		dev_err(&pdev->dev, "%s: cannot register restart handler, %d\n",
+				__func__, ret);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int gpio_restart_remove(struct platform_device *pdev)
+{
+	struct gpio_restart *gpio_restart = platform_get_drvdata(pdev);
+	int ret;
+
+	ret = unregister_restart_handler(&gpio_restart->restart_handler);
+	if (ret) {
+		dev_err(&pdev->dev,
+				"%s: cannot unregister restart handler, %d\n",
+				__func__, ret);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id of_gpio_restart_match[] = {
+	{ .compatible = "gpio-restart", },
+	{},
+};
+
+static struct platform_driver gpio_restart_driver = {
+	.probe = gpio_restart_probe,
+	.remove = gpio_restart_remove,
+	.driver = {
+		.name = "restart-gpio",
+		.of_match_table = of_gpio_restart_match,
+	},
+};
+
+module_platform_driver(gpio_restart_driver);
+
+MODULE_AUTHOR("David Riley <davidriley@chromium.org>");
+MODULE_DESCRIPTION("GPIO restart driver");
+MODULE_LICENSE("GPL");