drivers/power/reset/msm-poweroff.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (c) 2013, The Linux Foundation. All rights reserved.
   3  */
   4
   5 #include <linux/delay.h>
   6 #include <linux/err.h>
   7 #include <linux/init.h>
   8 #include <linux/kernel.h>
   9 #include <linux/io.h>
  10 #include <linux/of.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/module.h>
  13 #include <linux/reboot.h>
  14 #include <linux/pm.h>
  15
  16 static void __iomem *msm_ps_hold;
  17
  18 static int do_msm_poweroff(struct sys_off_data *data)
  19 {
  20         writel(0, msm_ps_hold);
  21         mdelay(10000);
  22
  23         return NOTIFY_DONE;
  24 }
  25
  26 static int msm_restart_probe(struct platform_device *pdev)
  27 {
  28         msm_ps_hold = devm_platform_ioremap_resource(pdev, 0);
  29         if (IS_ERR(msm_ps_hold))
  30                 return PTR_ERR(msm_ps_hold);
  31
  32         devm_register_sys_off_handler(&pdev->dev, SYS_OFF_MODE_RESTART,
  33                                       128, do_msm_poweroff, NULL);
  34
  35         devm_register_sys_off_handler(&pdev->dev, SYS_OFF_MODE_POWER_OFF,
  36                                       SYS_OFF_PRIO_DEFAULT, do_msm_poweroff,
  37                                       NULL);
  38
  39         return 0;
  40 }
  41
  42 static const struct of_device_id of_msm_restart_match[] = {
  43         { .compatible = "qcom,pshold", },
  44         {},
  45 };
  46 MODULE_DEVICE_TABLE(of, of_msm_restart_match);
  47
  48 static struct platform_driver msm_restart_driver = {
  49         .probe = msm_restart_probe,
  50         .driver = {
  51                 .name = "msm-restart",
  52                 .of_match_table = of_match_ptr(of_msm_restart_match),
  53         },
  54 };
  55 builtin_platform_driver(msm_restart_driver);