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
tps65086_restart_notify(struct sys_off_data * data)12 static 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
tps65086_restart_probe(struct platform_device * pdev)32 static 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
43 static const struct platform_device_id tps65086_restart_id_table[] = {
44 { "tps65086-reset", },
45 { /* sentinel */ }
46 };
47 MODULE_DEVICE_TABLE(platform, tps65086_restart_id_table);
48
49 static 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 };
56 module_platform_driver(tps65086_restart_driver);
57
58 MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
59 MODULE_DESCRIPTION("TPS65086 restart driver");
60