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 #include <linux/dmi.h>
  28
  29 MODULE_AUTHOR("Azael Avalos");
  30 MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
  31 MODULE_LICENSE("GPL");
  32
  33 #define WMI_EVENT_GUID  "59142400-C6A3-40FA-BADB-8A2652834100"
  34
  35 MODULE_ALIAS("wmi:"WMI_EVENT_GUID);
  36
  37 static struct input_dev *toshiba_wmi_input_dev;
  38
  39 static const struct key_entry toshiba_wmi_keymap[] __initconst = {
  40         /* TODO: Add keymap values once found... */
  41         /*{ KE_KEY, 0x00, { KEY_ } },*/
  42         { KE_END, 0 }
  43 };
  44
  45 static void toshiba_wmi_notify(u32 value, void *context)
  46 {
  47         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
  48         union acpi_object *obj;
  49         acpi_status status;
  50
  51         status = wmi_get_event_data(value, &response);
  52         if (ACPI_FAILURE(status)) {
  53                 pr_err("Bad event status 0x%x\n", status);
  54                 return;
  55         }
  56
  57         obj = (union acpi_object *)response.pointer;
  58         if (!obj)
  59                 return;
  60
  61         /* TODO: Add proper checks once we have data */
  62         pr_debug("Unknown event received, obj type %x\n", obj->type);
  63
  64         kfree(response.pointer);
  65 }
  66
  67 static struct dmi_system_id toshiba_wmi_dmi_table[] __initdata = {
  68         {
  69                 .ident = "Toshiba laptop",
  70                 .matches = {
  71                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  72                 },
  73         },
  74         {}
  75 };
  76
  77 static int __init toshiba_wmi_input_setup(void)
  78 {
  79         acpi_status status;
  80         int err;
  81
  82         toshiba_wmi_input_dev = input_allocate_device();
  83         if (!toshiba_wmi_input_dev)
  84                 return -ENOMEM;
  85
  86         toshiba_wmi_input_dev->name = "Toshiba WMI hotkeys";
  87         toshiba_wmi_input_dev->phys = "wmi/input0";
  88         toshiba_wmi_input_dev->id.bustype = BUS_HOST;
  89
  90         err = sparse_keymap_setup(toshiba_wmi_input_dev,
  91                                   toshiba_wmi_keymap, NULL);
  92         if (err)
  93                 goto err_free_dev;
  94
  95         status = wmi_install_notify_handler(WMI_EVENT_GUID,
  96                                             toshiba_wmi_notify, NULL);
  97         if (ACPI_FAILURE(status)) {
  98                 err = -EIO;
  99                 goto err_free_keymap;
 100         }
 101
 102         err = input_register_device(toshiba_wmi_input_dev);
 103         if (err)
 104                 goto err_remove_notifier;
 105
 106         return 0;
 107
 108  err_remove_notifier:
 109         wmi_remove_notify_handler(WMI_EVENT_GUID);
 110  err_free_keymap:
 111         sparse_keymap_free(toshiba_wmi_input_dev);
 112  err_free_dev:
 113         input_free_device(toshiba_wmi_input_dev);
 114         return err;
 115 }
 116
 117 static void toshiba_wmi_input_destroy(void)
 118 {
 119         wmi_remove_notify_handler(WMI_EVENT_GUID);
 120         sparse_keymap_free(toshiba_wmi_input_dev);
 121         input_unregister_device(toshiba_wmi_input_dev);
 122 }
 123
 124 static int __init toshiba_wmi_init(void)
 125 {
 126         int ret;
 127
 128         if (!wmi_has_guid(WMI_EVENT_GUID) ||
 129             !dmi_check_system(toshiba_wmi_dmi_table))
 130                 return -ENODEV;
 131
 132         ret = toshiba_wmi_input_setup();
 133         if (ret) {
 134                 pr_err("Failed to setup input device\n");
 135                 return ret;
 136         }
 137
 138         pr_info("Toshiba WMI Hotkey Driver\n");
 139
 140         return 0;
 141 }
 142
 143 static void __exit toshiba_wmi_exit(void)
 144 {
 145         if (wmi_has_guid(WMI_EVENT_GUID))
 146                 toshiba_wmi_input_destroy();
 147 }
 148
 149 module_init(toshiba_wmi_init);
 150 module_exit(toshiba_wmi_exit);