root/arch/x86/platform/intel-mid/device_libs/platform_mrfld_power_btn.c

DEFINITIONS

1. mrfld_power_btn_scu_status_change
2. register_mrfld_power_btn
3. mrfld_power_btn_platform_data

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel Merrifield power button support
   4  *
   5  * (C) Copyright 2017 Intel Corporation
   6  *
   7  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   8  */
   9 
  10 #include <linux/init.h>
  11 #include <linux/ioport.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/sfi.h>
  14 
  15 #include <asm/intel-mid.h>
  16 #include <asm/intel_scu_ipc.h>
  17 
  18 static struct resource mrfld_power_btn_resources[] = {
  19         {
  20                 .flags          = IORESOURCE_IRQ,
  21         },
  22 };
  23 
  24 static struct platform_device mrfld_power_btn_dev = {
  25         .name           = "msic_power_btn",
  26         .id             = PLATFORM_DEVID_NONE,
  27         .num_resources  = ARRAY_SIZE(mrfld_power_btn_resources),
  28         .resource       = mrfld_power_btn_resources,
  29 };
  30 
  31 static int mrfld_power_btn_scu_status_change(struct notifier_block *nb,
  32                                              unsigned long code, void *data)
  33 {
  34         if (code == SCU_DOWN) {
  35                 platform_device_unregister(&mrfld_power_btn_dev);
  36                 return 0;
  37         }
  38 
  39         return platform_device_register(&mrfld_power_btn_dev);
  40 }
  41 
  42 static struct notifier_block mrfld_power_btn_scu_notifier = {
  43         .notifier_call  = mrfld_power_btn_scu_status_change,
  44 };
  45 
  46 static int __init register_mrfld_power_btn(void)
  47 {
  48         if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER)
  49                 return -ENODEV;
  50 
  51         /*
  52          * We need to be sure that the SCU IPC is ready before
  53          * PMIC power button device can be registered:
  54          */
  55         intel_scu_notifier_add(&mrfld_power_btn_scu_notifier);
  56 
  57         return 0;
  58 }
  59 arch_initcall(register_mrfld_power_btn);
  60 
  61 static void __init *mrfld_power_btn_platform_data(void *info)
  62 {
  63         struct resource *res = mrfld_power_btn_resources;
  64         struct sfi_device_table_entry *pentry = info;
  65 
  66         res->start = res->end = pentry->irq;
  67         return NULL;
  68 }
  69 
  70 static const struct devs_id mrfld_power_btn_dev_id __initconst = {
  71         .name                   = "bcove_power_btn",
  72         .type                   = SFI_DEV_TYPE_IPC,
  73         .delay                  = 1,
  74         .msic                   = 1,
  75         .get_platform_data      = &mrfld_power_btn_platform_data,
  76 };
  77 
  78 sfi_device(mrfld_power_btn_dev_id);