drivers/platform/x86/toshiba-wmi.c

   1 /*
   2  * toshiba_wmi.c - Toshiba WMI Hotkey Driver
   3  *
   4  * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/types.h>
  24 #include <linux/acpi.h>
  25 #include <linux/input.h>
  26 #include <linux/input/sparse-keymap.h>
  27
  28 MODULE_AUTHOR("Azael Avalos");
  29 MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
  30 MODULE_LICENSE("GPL");
  31
  32 #define TOSHIBA_WMI_EVENT_GUID  "59142400-C6A3-40FA-BADB-8A2652834100"
  33
  34 MODULE_ALIAS("wmi:"TOSHIBA_WMI_EVENT_GUID);
  35
  36 static struct input_dev *toshiba_wmi_input_dev;
  37
  38 static const struct key_entry toshiba_wmi_keymap[] __initconst = {
  39         /* TODO: Add keymap values once found... */
  40         /*{ KE_KEY, 0x00, { KEY_ } },*/
  41         { KE_END, 0 }
  42 };
  43
  44 static void toshiba_wmi_notify(u32 value, void *context)
  45 {
  46         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
  47         union acpi_object *obj;
  48         acpi_status status;
  49
  50         status = wmi_get_event_data(value, &response);
  51         if (ACPI_FAILURE(status)) {
  52                 pr_err("Bad event status 0x%x\n", status);
  53                 return;
  54         }
  55
  56         obj = (union acpi_object *)response.pointer;
  57         if (!obj)
  58                 return;
  59
  60         /* TODO: Add proper checks once we have data */
  61         pr_debug("Unknown event received, obj type %x\n", obj->type);
  62
  63         kfree(response.pointer);
  64 }
  65
  66 static int __init toshiba_wmi_input_setup(void)
  67 {
  68         acpi_status status;
  69         int err;
  70
  71         toshiba_wmi_input_dev = input_allocate_device();
  72         if (!toshiba_wmi_input_dev)
  73                 return -ENOMEM;
  74
  75         toshiba_wmi_input_dev->name = "Toshiba WMI hotkeys";
  76         toshiba_wmi_input_dev->phys = "wmi/input0";
  77         toshiba_wmi_input_dev->id.bustype = BUS_HOST;
  78
  79         err = sparse_keymap_setup(toshiba_wmi_input_dev,
  80                                   toshiba_wmi_keymap, NULL);
  81         if (err)
  82                 goto err_free_dev;
  83
  84         status = wmi_install_notify_handler(TOSHIBA_WMI_EVENT_GUID,
  85                                             toshiba_wmi_notify, NULL);
  86         if (ACPI_FAILURE(status)) {
  87                 err = -EIO;
  88                 goto err_free_keymap;
  89         }
  90
  91         err = input_register_device(toshiba_wmi_input_dev);
  92         if (err)
  93                 goto err_remove_notifier;
  94
  95         return 0;
  96
  97  err_remove_notifier:
  98         wmi_remove_notify_handler(TOSHIBA_WMI_EVENT_GUID);
  99  err_free_keymap:
 100         sparse_keymap_free(toshiba_wmi_input_dev);
 101  err_free_dev:
 102         input_free_device(toshiba_wmi_input_dev);
 103         return err;
 104 }
 105
 106 static void toshiba_wmi_input_destroy(void)
 107 {
 108         wmi_remove_notify_handler(TOSHIBA_WMI_EVENT_GUID);
 109         sparse_keymap_free(toshiba_wmi_input_dev);
 110         input_unregister_device(toshiba_wmi_input_dev);
 111 }
 112
 113 static int __init toshiba_wmi_init(void)
 114 {
 115         int ret;
 116
 117         if (!wmi_has_guid(TOSHIBA_WMI_EVENT_GUID))
 118                 return -ENODEV;
 119
 120         ret = toshiba_wmi_input_setup();
 121         if (ret) {
 122                 pr_err("Failed to setup input device\n");
 123                 return ret;
 124         }
 125
 126         pr_info("Toshiba WMI Hotkey Driver\n");
 127
 128         return 0;
 129 }
 130
 131 static void __exit toshiba_wmi_exit(void)
 132 {
 133         if (wmi_has_guid(TOSHIBA_WMI_EVENT_GUID))
 134                 toshiba_wmi_input_destroy();
 135 }
 136
 137 module_init(toshiba_wmi_init);
 138 module_exit(toshiba_wmi_exit);