/* * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/reboot.h> #include <linux/regmap.h> #include <linux/mfd/syscon.h> #include <linux/reboot-mode.h> struct syscon_reboot_mode { struct regmap *map; struct reboot_mode_driver reboot; u32 offset; u32 mask; }; static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot, unsigned int magic) { struct syscon_reboot_mode *syscon_rbm; int ret; syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot); ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset, syscon_rbm->mask, magic); if (ret < 0) dev_err(reboot->dev, "update reboot mode bits failed\n"); return ret; } static int syscon_reboot_mode_probe(struct platform_device *pdev) { int ret; struct syscon_reboot_mode *syscon_rbm; syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL); if (!syscon_rbm) return -ENOMEM; syscon_rbm->reboot.dev = &pdev->dev; syscon_rbm->reboot.write = syscon_reboot_mode_write; syscon_rbm->mask = 0xffffffff; syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node); if (IS_ERR(syscon_rbm->map)) return PTR_ERR(syscon_rbm->map); if (of_property_read_u32(pdev->dev.of_node, "offset", &syscon_rbm->offset)) return -EINVAL; of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask); ret = devm_reboot_mode_register(&pdev->dev, &syscon_rbm->reboot); if (ret) dev_err(&pdev->dev, "can't register reboot mode\n"); return ret; } static const struct of_device_id syscon_reboot_mode_of_match[] = { { .compatible = "syscon-reboot-mode" }, {} }; MODULE_DEVICE_TABLE(of, syscon_reboot_mode_of_match); static struct platform_driver syscon_reboot_mode_driver = { .probe = syscon_reboot_mode_probe, .driver = { .name = "syscon-reboot-mode", .of_match_table = syscon_reboot_mode_of_match, }, }; module_platform_driver(syscon_reboot_mode_driver); MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com"); MODULE_DESCRIPTION("SYSCON reboot mode driver"); MODULE_LICENSE("GPL v2");