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