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
12struct tps65086_restart {
13	struct notifier_block handler;
14	struct device *dev;
15};
16
17static int tps65086_restart_notify(struct notifier_block *this,
18				   unsigned long mode, void *cmd)
19{
20	struct tps65086_restart *tps65086_restart =
21		container_of(this, struct tps65086_restart, handler);
22	struct tps65086 *tps65086 = dev_get_drvdata(tps65086_restart->dev->parent);
23	int ret;
24
25	ret = regmap_write(tps65086->regmap, TPS65086_FORCESHUTDN, 1);
26	if (ret) {
27		dev_err(tps65086_restart->dev, "%s: error writing to tps65086 pmic: %d\n",
28			__func__, ret);
29		return NOTIFY_DONE;
30	}
31
32	/* give it a little time */
33	mdelay(200);
34
35	WARN_ON(1);
36
37	return NOTIFY_DONE;
38}
39
40static int tps65086_restart_probe(struct platform_device *pdev)
41{
42	struct tps65086_restart *tps65086_restart;
43	int ret;
44
45	tps65086_restart = devm_kzalloc(&pdev->dev, sizeof(*tps65086_restart), GFP_KERNEL);
46	if (!tps65086_restart)
47		return -ENOMEM;
48
49	platform_set_drvdata(pdev, tps65086_restart);
50
51	tps65086_restart->handler.notifier_call = tps65086_restart_notify;
52	tps65086_restart->handler.priority = 192;
53	tps65086_restart->dev = &pdev->dev;
54
55	ret = register_restart_handler(&tps65086_restart->handler);
56	if (ret) {
57		dev_err(&pdev->dev, "%s: cannot register restart handler: %d\n",
58			__func__, ret);
59		return -ENODEV;
60	}
61
62	return 0;
63}
64
65static void tps65086_restart_remove(struct platform_device *pdev)
66{
67	struct tps65086_restart *tps65086_restart = platform_get_drvdata(pdev);
68	int ret;
69
70	ret = unregister_restart_handler(&tps65086_restart->handler);
71	if (ret) {
72		/*
73		 * tps65086_restart_probe() registered the restart handler. So
74		 * unregistering should work fine. Checking the error code
75		 * shouldn't be needed, still doing it for completeness.
76		 */
77		dev_err(&pdev->dev, "%s: cannot unregister restart handler: %d\n",
78			__func__, ret);
 
79	}
 
 
80}
81
82static const struct platform_device_id tps65086_restart_id_table[] = {
83	{ "tps65086-reset", },
84	{ /* sentinel */ }
85};
86MODULE_DEVICE_TABLE(platform, tps65086_restart_id_table);
87
88static struct platform_driver tps65086_restart_driver = {
89	.driver = {
90		.name = "tps65086-restart",
91	},
92	.probe = tps65086_restart_probe,
93	.remove_new = tps65086_restart_remove,
94	.id_table = tps65086_restart_id_table,
95};
96module_platform_driver(tps65086_restart_driver);
97
98MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
99MODULE_DESCRIPTION("TPS65086 restart driver");

 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
12struct tps65086_restart {
13	struct notifier_block handler;
14	struct device *dev;
15};
16
17static int tps65086_restart_notify(struct notifier_block *this,
18				   unsigned long mode, void *cmd)
19{
20	struct tps65086_restart *tps65086_restart =
21		container_of(this, struct tps65086_restart, handler);
22	struct tps65086 *tps65086 = dev_get_drvdata(tps65086_restart->dev->parent);
23	int ret;
24
25	ret = regmap_write(tps65086->regmap, TPS65086_FORCESHUTDN, 1);
26	if (ret) {
27		dev_err(tps65086_restart->dev, "%s: error writing to tps65086 pmic: %d\n",
28			__func__, ret);
29		return NOTIFY_DONE;
30	}
31
32	/* give it a little time */
33	mdelay(200);
34
35	WARN_ON(1);
36
37	return NOTIFY_DONE;
38}
39
40static int tps65086_restart_probe(struct platform_device *pdev)
41{
42	struct tps65086_restart *tps65086_restart;
43	int ret;
44
45	tps65086_restart = devm_kzalloc(&pdev->dev, sizeof(*tps65086_restart), GFP_KERNEL);
46	if (!tps65086_restart)
47		return -ENOMEM;
48
49	platform_set_drvdata(pdev, tps65086_restart);
50
51	tps65086_restart->handler.notifier_call = tps65086_restart_notify;
52	tps65086_restart->handler.priority = 192;
53	tps65086_restart->dev = &pdev->dev;
54
55	ret = register_restart_handler(&tps65086_restart->handler);
56	if (ret) {
57		dev_err(&pdev->dev, "%s: cannot register restart handler: %d\n",
58			__func__, ret);
59		return -ENODEV;
60	}
61
62	return 0;
63}
64
65static int tps65086_restart_remove(struct platform_device *pdev)
66{
67	struct tps65086_restart *tps65086_restart = platform_get_drvdata(pdev);
68	int ret;
69
70	ret = unregister_restart_handler(&tps65086_restart->handler);
71	if (ret) {
 
 
 
 
 
72		dev_err(&pdev->dev, "%s: cannot unregister restart handler: %d\n",
73			__func__, ret);
74		return -ENODEV;
75	}
76
77	return 0;
78}
79
80static const struct platform_device_id tps65086_restart_id_table[] = {
81	{ "tps65086-reset", },
82	{ /* sentinel */ }
83};
84MODULE_DEVICE_TABLE(platform, tps65086_restart_id_table);
85
86static struct platform_driver tps65086_restart_driver = {
87	.driver = {
88		.name = "tps65086-restart",
89	},
90	.probe = tps65086_restart_probe,
91	.remove = tps65086_restart_remove,
92	.id_table = tps65086_restart_id_table,
93};
94module_platform_driver(tps65086_restart_driver);
95
96MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
97MODULE_DESCRIPTION("TPS65086 restart driver");
98MODULE_LICENSE("GPL v2");