99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2021 Emil Renner Berthing
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*/
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#include <linux/mfd/tps65086.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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struct tps65086_restart {
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struct notifier_block handler;
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struct device *dev;
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};
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static int tps65086_restart_notify(struct notifier_block *this,
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unsigned long mode, void *cmd)
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{
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struct tps65086_restart *tps65086_restart =
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container_of(this, struct tps65086_restart, handler);
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struct tps65086 *tps65086 = dev_get_drvdata(tps65086_restart->dev->parent);
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int ret;
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ret = regmap_write(tps65086->regmap, TPS65086_FORCESHUTDN, 1);
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if (ret) {
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dev_err(tps65086_restart->dev, "%s: error writing to tps65086 pmic: %d\n",
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__func__, ret);
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return NOTIFY_DONE;
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}
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/* give it a little time */
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mdelay(200);
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WARN_ON(1);
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return NOTIFY_DONE;
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}
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static int tps65086_restart_probe(struct platform_device *pdev)
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{
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struct tps65086_restart *tps65086_restart;
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int ret;
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tps65086_restart = devm_kzalloc(&pdev->dev, sizeof(*tps65086_restart), GFP_KERNEL);
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if (!tps65086_restart)
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return -ENOMEM;
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platform_set_drvdata(pdev, tps65086_restart);
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tps65086_restart->handler.notifier_call = tps65086_restart_notify;
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tps65086_restart->handler.priority = 192;
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tps65086_restart->dev = &pdev->dev;
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ret = register_restart_handler(&tps65086_restart->handler);
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if (ret) {
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dev_err(&pdev->dev, "%s: cannot register restart handler: %d\n",
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__func__, ret);
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return -ENODEV;
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}
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return 0;
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}
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static int tps65086_restart_remove(struct platform_device *pdev)
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{
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struct tps65086_restart *tps65086_restart = platform_get_drvdata(pdev);
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int ret;
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ret = unregister_restart_handler(&tps65086_restart->handler);
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if (ret) {
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dev_err(&pdev->dev, "%s: cannot unregister restart handler: %d\n",
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__func__, ret);
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return -ENODEV;
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}
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return 0;
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}
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static const struct platform_device_id tps65086_restart_id_table[] = {
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{ "tps65086-reset", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, tps65086_restart_id_table);
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static struct platform_driver tps65086_restart_driver = {
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.driver = {
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.name = "tps65086-restart",
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},
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.probe = tps65086_restart_probe,
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.remove = tps65086_restart_remove,
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.id_table = tps65086_restart_id_table,
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};
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module_platform_driver(tps65086_restart_driver);
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MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
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MODULE_DESCRIPTION("TPS65086 restart driver");
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MODULE_LICENSE("GPL v2");
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