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);