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 <[email protected]>
   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(union acpi_object *obj, void *context)
  36 {
  37         if (!obj)
  38                 return;
  39
  40         /* TODO: Add proper checks once we have data */
  41         pr_debug("Unknown event received, obj type %x\n", obj->type);
  42 }
  43
  44 static const struct dmi_system_id toshiba_wmi_dmi_table[] __initconst = {
  45         {
  46                 .ident = "Toshiba laptop",
  47                 .matches = {
  48                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  49                 },
  50         },
  51         {}
  52 };
  53
  54 static int __init toshiba_wmi_input_setup(void)
  55 {
  56         acpi_status status;
  57         int err;
  58
  59         toshiba_wmi_input_dev = input_allocate_device();
  60         if (!toshiba_wmi_input_dev)
  61                 return -ENOMEM;
  62
  63         toshiba_wmi_input_dev->name = "Toshiba WMI hotkeys";
  64         toshiba_wmi_input_dev->phys = "wmi/input0";
  65         toshiba_wmi_input_dev->id.bustype = BUS_HOST;
  66
  67         err = sparse_keymap_setup(toshiba_wmi_input_dev,
  68                                   toshiba_wmi_keymap, NULL);
  69         if (err)
  70                 goto err_free_dev;
  71
  72         status = wmi_install_notify_handler(WMI_EVENT_GUID,
  73                                             toshiba_wmi_notify, NULL);
  74         if (ACPI_FAILURE(status)) {
  75                 err = -EIO;
  76                 goto err_free_dev;
  77         }
  78
  79         err = input_register_device(toshiba_wmi_input_dev);
  80         if (err)
  81                 goto err_remove_notifier;
  82
  83         return 0;
  84
  85  err_remove_notifier:
  86         wmi_remove_notify_handler(WMI_EVENT_GUID);
  87  err_free_dev:
  88         input_free_device(toshiba_wmi_input_dev);
  89         return err;
  90 }
  91
  92 static void toshiba_wmi_input_destroy(void)
  93 {
  94         wmi_remove_notify_handler(WMI_EVENT_GUID);
  95         input_unregister_device(toshiba_wmi_input_dev);
  96 }
  97
  98 static int __init toshiba_wmi_init(void)
  99 {
 100         int ret;
 101
 102         if (!wmi_has_guid(WMI_EVENT_GUID) ||
 103             !dmi_check_system(toshiba_wmi_dmi_table))
 104                 return -ENODEV;
 105
 106         ret = toshiba_wmi_input_setup();
 107         if (ret) {
 108                 pr_err("Failed to setup input device\n");
 109                 return ret;
 110         }
 111
 112         pr_info("Toshiba WMI Hotkey Driver\n");
 113
 114         return 0;
 115 }
 116
 117 static void __exit toshiba_wmi_exit(void)
 118 {
 119         if (wmi_has_guid(WMI_EVENT_GUID))
 120                 toshiba_wmi_input_destroy();
 121 }
 122
 123 module_init(toshiba_wmi_init);
 124 module_exit(toshiba_wmi_exit);