cregit-Linux how code gets into the kernel

Release 4.11 drivers/power/reset/syscon-poweroff.c

/*
 * Generic Syscon Poweroff Driver
 *
 * Copyright (c) 2015, National Instruments Corp.
 * Author: Moritz Fischer <moritz.fischer@ettus.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/kallsyms.h>
#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/pm.h>
#include <linux/regmap.h>


static struct regmap *map;

static u32 offset;

static u32 mask;


static void syscon_poweroff(void) { /* Issue the poweroff */ regmap_write(map, offset, mask); mdelay(1000); pr_emerg("Unable to poweroff system\n"); }

Contributors

PersonTokensPropCommitsCommitProp
Moritz Fischer2796.43%150.00%
Ben Dooks13.57%150.00%
Total28100.00%2100.00%


static int syscon_poweroff_probe(struct platform_device *pdev) { char symname[KSYM_NAME_LEN]; map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "regmap"); if (IS_ERR(map)) { dev_err(&pdev->dev, "unable to get syscon"); return PTR_ERR(map); } if (of_property_read_u32(pdev->dev.of_node, "offset", &offset)) { dev_err(&pdev->dev, "unable to read 'offset'"); return -EINVAL; } if (of_property_read_u32(pdev->dev.of_node, "mask", &mask)) { dev_err(&pdev->dev, "unable to read 'mask'"); return -EINVAL; } if (pm_power_off) { lookup_symbol_name((ulong)pm_power_off, symname); dev_err(&pdev->dev, "pm_power_off already claimed %p %s", pm_power_off, symname); return -EBUSY; } pm_power_off = syscon_poweroff; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Moritz Fischer160100.00%1100.00%
Total160100.00%1100.00%


static int syscon_poweroff_remove(struct platform_device *pdev) { if (pm_power_off == syscon_poweroff) pm_power_off = NULL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Moritz Fischer24100.00%1100.00%
Total24100.00%1100.00%

static const struct of_device_id syscon_poweroff_of_match[] = { { .compatible = "syscon-poweroff" }, {} }; static struct platform_driver syscon_poweroff_driver = { .probe = syscon_poweroff_probe, .remove = syscon_poweroff_remove, .driver = { .name = "syscon-poweroff", .of_match_table = syscon_poweroff_of_match, }, };
static int __init syscon_poweroff_register(void) { return platform_driver_register(&syscon_poweroff_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Moritz Fischer16100.00%1100.00%
Total16100.00%1100.00%

device_initcall(syscon_poweroff_register);

Overall Contributors

PersonTokensPropCommitsCommitProp
Moritz Fischer32799.70%150.00%
Ben Dooks10.30%150.00%
Total328100.00%2100.00%
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