LXR linux/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
  19MODULE_AUTHOR("Azael Avalos");
  20MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
  21MODULE_LICENSE("GPL");
  22
  23#define WMI_EVENT_GUID  "59142400-C6A3-40FA-BADB-8A2652834100"
  24
  25MODULE_ALIAS("wmi:"WMI_EVENT_GUID);
  26
  27static struct input_dev *toshiba_wmi_input_dev;
  28
  29static 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
  35static 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
  57static 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
  67static 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
 105static 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
 111static 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
 130static void __exit toshiba_wmi_exit(void)
 131{
 132        if (wmi_has_guid(WMI_EVENT_GUID))
 133                toshiba_wmi_input_destroy();
 134}
 135
 136module_init(toshiba_wmi_init);
 137module_exit(toshiba_wmi_exit);
 138