LXR linux/drivers/power/reset/msm-poweroff.c

   1/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
   2 *
   3 * This program is free software; you can redistribute it and/or modify
   4 * it under the terms of the GNU General Public License version 2 and
   5 * only version 2 as published by the Free Software Foundation.
   6 *
   7 * This program is distributed in the hope that it will be useful,
   8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10 * GNU General Public License for more details.
  11 *
  12 */
  13
  14#include <linux/delay.h>
  15#include <linux/err.h>
  16#include <linux/init.h>
  17#include <linux/kernel.h>
  18#include <linux/io.h>
  19#include <linux/of.h>
  20#include <linux/platform_device.h>
  21#include <linux/module.h>
  22#include <linux/reboot.h>
  23
  24#include <asm/system_misc.h>
  25
  26static void __iomem *msm_ps_hold;
  27
  28static void do_msm_restart(enum reboot_mode reboot_mode, const char *cmd)
  29{
  30        writel(0, msm_ps_hold);
  31        mdelay(10000);
  32}
  33
  34static void do_msm_poweroff(void)
  35{
  36        /* TODO: Add poweroff capability */
  37        do_msm_restart(REBOOT_HARD, NULL);
  38}
  39
  40static int msm_restart_probe(struct platform_device *pdev)
  41{
  42        struct device *dev = &pdev->dev;
  43        struct resource *mem;
  44
  45        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  46        msm_ps_hold = devm_ioremap_resource(dev, mem);
  47        if (IS_ERR(msm_ps_hold))
  48                return PTR_ERR(msm_ps_hold);
  49
  50        pm_power_off = do_msm_poweroff;
  51        arm_pm_restart = do_msm_restart;
  52        return 0;
  53}
  54
  55static const struct of_device_id of_msm_restart_match[] = {
  56        { .compatible = "qcom,pshold", },
  57        {},
  58};
  59MODULE_DEVICE_TABLE(of, of_msm_restart_match);
  60
  61static struct platform_driver msm_restart_driver = {
  62        .probe = msm_restart_probe,
  63        .driver = {
  64                .name = "msm-restart",
  65                .of_match_table = of_match_ptr(of_msm_restart_match),
  66        },
  67};
  68
  69static int __init msm_restart_init(void)
  70{
  71        return platform_driver_register(&msm_restart_driver);
  72}
  73device_initcall(msm_restart_init);
  74