drivers/platform/x86/toshiba-wmi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * toshiba_wmi.c - Toshiba WMI Hotkey Driver
   4  *
   5  * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/types.h>
  14 #include <linux/acpi.h>
  15 #include <linux/input.h>
  16 #include <linux/input/sparse-keymap.h>
  17 #include <linux/dmi.h>
  18
  19 MODULE_AUTHOR("Azael Avalos");
  20 MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
  21 MODULE_LICENSE("GPL");
  22
  23 #define WMI_EVENT_GUID  "59142400-C6A3-40FA-BADB-8A2652834100"
  24
  25 MODULE_ALIAS("wmi:"WMI_EVENT_GUID);
  26
  27 static struct input_dev *toshiba_wmi_input_dev;
  28
  29 static const struct key_entry toshiba_wmi_keymap[] __initconst = {
  30         /* TODO: Add keymap values once found... */
  31         /*{ KE_KEY, 0x00, { KEY_ } },*/
  32         { KE_END, 0 }
  33 };
  34
  35 static void toshiba_wmi_notify(u32 value, void *context)
  36 {
  37         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
  38         union acpi_object *obj;
  39         acpi_status status;
  40
  41         status = wmi_get_event_data(value, &response);
  42         if (ACPI_FAILURE(status)) {
  43                 pr_err("Bad event status 0x%x\n", status);
  44                 return;
  45         }
  46
  47         obj = (union acpi_object *)response.pointer;
  48         if (!obj)
  49                 return;
  50
  51         /* TODO: Add proper checks once we have data */
  52         pr_debug("Unknown event received, obj type %x\n", obj->type);
  53
  54         kfree(response.pointer);
  55 }
  56
  57 static const struct dmi_system_id toshiba_wmi_dmi_table[] __initconst = {
  58         {
  59                 .ident = "Toshiba laptop",
  60                 .matches = {
  61                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  62                 },
  63         },
  64         {}
  65 };
  66
  67 static int __init toshiba_wmi_input_setup(void)
  68 {
  69         acpi_status status;
  70         int err;
  71
  72         toshiba_wmi_input_dev = input_allocate_device();
  73         if (!toshiba_wmi_input_dev)
  74                 return -ENOMEM;
  75
  76         toshiba_wmi_input_dev->name = "Toshiba WMI hotkeys";
  77         toshiba_wmi_input_dev->phys = "wmi/input0";
  78         toshiba_wmi_input_dev->id.bustype = BUS_HOST;
  79
  80         err = sparse_keymap_setup(toshiba_wmi_input_dev,
  81                                   toshiba_wmi_keymap, NULL);
  82         if (err)
  83                 goto err_free_dev;
  84
  85         status = wmi_install_notify_handler(WMI_EVENT_GUID,
  86                                             toshiba_wmi_notify, NULL);
  87         if (ACPI_FAILURE(status)) {
  88                 err = -EIO;
  89                 goto err_free_dev;
  90         }
  91
  92         err = input_register_device(toshiba_wmi_input_dev);
  93         if (err)
  94                 goto err_remove_notifier;
  95
  96         return 0;
  97
  98  err_remove_notifier:
  99         wmi_remove_notify_handler(WMI_EVENT_GUID);
 100  err_free_dev:
 101         input_free_device(toshiba_wmi_input_dev);
 102         return err;
 103 }
 104
 105 static void toshiba_wmi_input_destroy(void)
 106 {
 107         wmi_remove_notify_handler(WMI_EVENT_GUID);
 108         input_unregister_device(toshiba_wmi_input_dev);
 109 }
 110
 111 static int __init toshiba_wmi_init(void)
 112 {
 113         int ret;
 114
 115         if (!wmi_has_guid(WMI_EVENT_GUID) ||
 116             !dmi_check_system(toshiba_wmi_dmi_table))
 117                 return -ENODEV;
 118
 119         ret = toshiba_wmi_input_setup();
 120         if (ret) {
 121                 pr_err("Failed to setup input device\n");
 122                 return ret;
 123         }
 124
 125         pr_info("Toshiba WMI Hotkey Driver\n");
 126
 127         return 0;
 128 }
 129
 130 static void __exit toshiba_wmi_exit(void)
 131 {
 132         if (wmi_has_guid(WMI_EVENT_GUID))
 133                 toshiba_wmi_input_destroy();
 134 }
 135
 136 module_init(toshiba_wmi_init);
 137 module_exit(toshiba_wmi_exit);