![Andy Yan](/assets/img/avatar_default.png)
This driver parses the reboot commands like "reboot bootloader" and "reboot recovery" to get a boot mode described in the device tree , then call the write interfae to store the boot mode in some place like special register or sram, which can be read by the bootloader after system reboot, then the bootloader can take different action according to the mode stored. This is commonly used on Android based devices, in order to reboot the device into fastboot or recovery mode. Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Reviewed-by: Moritz Fischer <moritz.fischer@ettus.com> Tested-by: John Stultz <john.stultz@linaro.org> Acked-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Andy Yan <andy.yan@rock-chips.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/*
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* Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/reboot.h>
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#include "reboot-mode.h"
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#define PREFIX "mode-"
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struct mode_info {
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const char *mode;
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u32 magic;
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struct list_head list;
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};
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static unsigned int get_reboot_mode_magic(struct reboot_mode_driver *reboot,
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const char *cmd)
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{
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const char *normal = "normal";
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int magic = 0;
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struct mode_info *info;
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if (!cmd)
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cmd = normal;
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list_for_each_entry(info, &reboot->head, list) {
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if (!strcmp(info->mode, cmd)) {
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magic = info->magic;
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break;
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}
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}
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return magic;
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}
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static int reboot_mode_notify(struct notifier_block *this,
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unsigned long mode, void *cmd)
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{
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struct reboot_mode_driver *reboot;
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unsigned int magic;
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reboot = container_of(this, struct reboot_mode_driver, reboot_notifier);
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magic = get_reboot_mode_magic(reboot, cmd);
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if (magic)
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reboot->write(reboot, magic);
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return NOTIFY_DONE;
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}
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/**
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* reboot_mode_register - register a reboot mode driver
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* @reboot: reboot mode driver
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*
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* Returns: 0 on success or a negative error code on failure.
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*/
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int reboot_mode_register(struct reboot_mode_driver *reboot)
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{
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struct mode_info *info;
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struct property *prop;
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struct device_node *np = reboot->dev->of_node;
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size_t len = strlen(PREFIX);
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int ret;
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INIT_LIST_HEAD(&reboot->head);
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for_each_property_of_node(np, prop) {
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if (strncmp(prop->name, PREFIX, len))
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continue;
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info = devm_kzalloc(reboot->dev, sizeof(*info), GFP_KERNEL);
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if (!info) {
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ret = -ENOMEM;
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goto error;
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}
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if (of_property_read_u32(np, prop->name, &info->magic)) {
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dev_err(reboot->dev, "reboot mode %s without magic number\n",
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info->mode);
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devm_kfree(reboot->dev, info);
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continue;
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}
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info->mode = kstrdup_const(prop->name + len, GFP_KERNEL);
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if (!info->mode) {
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ret = -ENOMEM;
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goto error;
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} else if (info->mode[0] == '\0') {
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kfree_const(info->mode);
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ret = -EINVAL;
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dev_err(reboot->dev, "invalid mode name(%s): too short!\n",
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prop->name);
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goto error;
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}
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list_add_tail(&info->list, &reboot->head);
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}
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reboot->reboot_notifier.notifier_call = reboot_mode_notify;
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register_reboot_notifier(&reboot->reboot_notifier);
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return 0;
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error:
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list_for_each_entry(info, &reboot->head, list)
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kfree_const(info->mode);
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return ret;
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}
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EXPORT_SYMBOL_GPL(reboot_mode_register);
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/**
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* reboot_mode_unregister - unregister a reboot mode driver
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* @reboot: reboot mode driver
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*/
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int reboot_mode_unregister(struct reboot_mode_driver *reboot)
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{
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struct mode_info *info;
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unregister_reboot_notifier(&reboot->reboot_notifier);
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list_for_each_entry(info, &reboot->head, list)
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kfree_const(info->mode);
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return 0;
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}
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EXPORT_SYMBOL_GPL(reboot_mode_unregister);
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MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com");
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MODULE_DESCRIPTION("System reboot mode core library");
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MODULE_LICENSE("GPL v2");
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