cregit-Linux how code gets into the kernel

Release 4.14 drivers/power/reset/syscon-reboot.c

/*
 * Generic Syscon Reboot Driver
 *
 * Copyright (c) 2013, Applied Micro Circuits Corporation
 * Author: Feng Kan <fkan@apm.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/notifier.h>
#include <linux/mfd/syscon.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>


struct syscon_reboot_context {
	
struct regmap *map;
	
u32 offset;
	
u32 mask;
	
struct notifier_block restart_handler;
};


static int syscon_restart_handle(struct notifier_block *this, unsigned long mode, void *cmd) { struct syscon_reboot_context *ctx = container_of(this, struct syscon_reboot_context, restart_handler); /* Issue the reboot */ regmap_write(ctx->map, ctx->offset, ctx->mask); mdelay(1000); pr_emerg("Unable to restart system\n"); return NOTIFY_DONE; }

Contributors

PersonTokensPropCommitsCommitProp
Feng Kan63100.00%2100.00%
Total63100.00%2100.00%


static int syscon_reboot_probe(struct platform_device *pdev) { struct syscon_reboot_context *ctx; struct device *dev = &pdev->dev; int err; ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; ctx->map = syscon_regmap_lookup_by_phandle(dev->of_node, "regmap"); if (IS_ERR(ctx->map)) return PTR_ERR(ctx->map); if (of_property_read_u32(pdev->dev.of_node, "offset", &ctx->offset)) return -EINVAL; if (of_property_read_u32(pdev->dev.of_node, "mask", &ctx->mask)) return -EINVAL; ctx->restart_handler.notifier_call = syscon_restart_handle; ctx->restart_handler.priority = 192; err = register_restart_handler(&ctx->restart_handler); if (err) dev_err(dev, "can't register restart notifier (err=%d)\n", err); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Feng Kan17199.42%266.67%
Stefan Agner10.58%133.33%
Total172100.00%3100.00%

static const struct of_device_id syscon_reboot_of_match[] = { { .compatible = "syscon-reboot" }, {} }; static struct platform_driver syscon_reboot_driver = { .probe = syscon_reboot_probe, .driver = { .name = "syscon-reboot", .of_match_table = syscon_reboot_of_match, }, }; builtin_platform_driver(syscon_reboot_driver);

Overall Contributors

PersonTokensPropCommitsCommitProp
Feng Kan33099.10%240.00%
Paul Gortmaker10.30%120.00%
Stefan Agner10.30%120.00%
Fabian Frederick10.30%120.00%
Total333100.00%5100.00%
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