1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2021 Emil Renner Berthing
4 */
5
6#include <linux/mfd/tps65086.h>
7#include <linux/mod_devicetable.h>
8#include <linux/module.h>
9#include <linux/platform_device.h>
10#include <linux/reboot.h>
11
12static int tps65086_restart_notify(struct sys_off_data *data)
13{
14	struct tps65086 *tps65086 = data->cb_data;
15	int ret;
16
17	ret = regmap_write(tps65086->regmap, TPS65086_FORCESHUTDN, 1);
18	if (ret) {
19		dev_err(tps65086->dev, "%s: error writing to tps65086 pmic: %d\n",
20			__func__, ret);
21		return NOTIFY_DONE;
22	}
23
24	/* give it a little time */
25	mdelay(200);
26
27	WARN_ON(1);
28
29	return NOTIFY_DONE;
30}
31
32static int tps65086_restart_probe(struct platform_device *pdev)
33{
34	struct tps65086 *tps65086 = dev_get_drvdata(pdev->dev.parent);
35
36	return devm_register_sys_off_handler(&pdev->dev,
37					     SYS_OFF_MODE_RESTART,
38					     SYS_OFF_PRIO_HIGH,
39					     tps65086_restart_notify,
40					     tps65086);
41}
42
43static const struct platform_device_id tps65086_restart_id_table[] = {
44	{ "tps65086-reset", },
45	{ /* sentinel */ }
46};
47MODULE_DEVICE_TABLE(platform, tps65086_restart_id_table);
48
49static struct platform_driver tps65086_restart_driver = {
50	.driver = {
51		.name = "tps65086-restart",
52	},
53	.probe = tps65086_restart_probe,
54	.id_table = tps65086_restart_id_table,
55};
56module_platform_driver(tps65086_restart_driver);
57
58MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
59MODULE_DESCRIPTION("TPS65086 restart driver");
60