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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 #include <linux/pm.h>
 24 
 25 static void __iomem *msm_ps_hold;
 26 static int do_msm_restart(struct notifier_block *nb, unsigned long action,
 27                            void *data)
 28 {
 29         writel(0, msm_ps_hold);
 30         mdelay(10000);
 31 
 32         return NOTIFY_DONE;
 33 }
 34 
 35 static struct notifier_block restart_nb = {
 36         .notifier_call = do_msm_restart,
 37         .priority = 128,
 38 };
 39 
 40 static void do_msm_poweroff(void)
 41 {
 42         /* TODO: Add poweroff capability */
 43         do_msm_restart(&restart_nb, 0, NULL);
 44 }
 45 
 46 static int msm_restart_probe(struct platform_device *pdev)
 47 {
 48         struct device *dev = &pdev->dev;
 49         struct resource *mem;
 50 
 51         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 52         msm_ps_hold = devm_ioremap_resource(dev, mem);
 53         if (IS_ERR(msm_ps_hold))
 54                 return PTR_ERR(msm_ps_hold);
 55 
 56         register_restart_handler(&restart_nb);
 57 
 58         pm_power_off = do_msm_poweroff;
 59 
 60         return 0;
 61 }
 62 
 63 static const struct of_device_id of_msm_restart_match[] = {
 64         { .compatible = "qcom,pshold", },
 65         {},
 66 };
 67 MODULE_DEVICE_TABLE(of, of_msm_restart_match);
 68 
 69 static struct platform_driver msm_restart_driver = {
 70         .probe = msm_restart_probe,
 71         .driver = {
 72                 .name = "msm-restart",
 73                 .of_match_table = of_match_ptr(of_msm_restart_match),
 74         },
 75 };
 76 
 77 static int __init msm_restart_init(void)
 78 {
 79         return platform_driver_register(&msm_restart_driver);
 80 }
 81 device_initcall(msm_restart_init);
 82 

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