2874c5fd28
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <linux/regmap.h>
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#include <linux/mfd/syscon.h>
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#include <linux/reboot-mode.h>
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struct syscon_reboot_mode {
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struct regmap *map;
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struct reboot_mode_driver reboot;
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u32 offset;
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u32 mask;
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};
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static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot,
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unsigned int magic)
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{
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struct syscon_reboot_mode *syscon_rbm;
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int ret;
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syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot);
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ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset,
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syscon_rbm->mask, magic);
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if (ret < 0)
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dev_err(reboot->dev, "update reboot mode bits failed\n");
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return ret;
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}
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static int syscon_reboot_mode_probe(struct platform_device *pdev)
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{
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int ret;
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struct syscon_reboot_mode *syscon_rbm;
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syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL);
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if (!syscon_rbm)
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return -ENOMEM;
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syscon_rbm->reboot.dev = &pdev->dev;
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syscon_rbm->reboot.write = syscon_reboot_mode_write;
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syscon_rbm->mask = 0xffffffff;
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syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
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if (IS_ERR(syscon_rbm->map))
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return PTR_ERR(syscon_rbm->map);
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if (of_property_read_u32(pdev->dev.of_node, "offset",
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&syscon_rbm->offset))
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return -EINVAL;
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of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask);
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ret = devm_reboot_mode_register(&pdev->dev, &syscon_rbm->reboot);
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if (ret)
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dev_err(&pdev->dev, "can't register reboot mode\n");
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return ret;
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}
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static const struct of_device_id syscon_reboot_mode_of_match[] = {
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{ .compatible = "syscon-reboot-mode" },
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{}
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};
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MODULE_DEVICE_TABLE(of, syscon_reboot_mode_of_match);
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static struct platform_driver syscon_reboot_mode_driver = {
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.probe = syscon_reboot_mode_probe,
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.driver = {
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.name = "syscon-reboot-mode",
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.of_match_table = syscon_reboot_mode_of_match,
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},
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};
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module_platform_driver(syscon_reboot_mode_driver);
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MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com");
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MODULE_DESCRIPTION("SYSCON reboot mode driver");
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MODULE_LICENSE("GPL v2");
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