platform/x86/toshiba-wmi.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * toshiba_wmi.c - Toshiba WMI Hotkey Driver
0004  *
0005  * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
0006  */
0007
0008 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0009
0010 #include <linux/kernel.h>
0011 #include <linux/module.h>
0012 #include <linux/init.h>
0013 #include <linux/types.h>
0014 #include <linux/acpi.h>
0015 #include <linux/input.h>
0016 #include <linux/input/sparse-keymap.h>
0017 #include <linux/dmi.h>
0018
0019 MODULE_AUTHOR("Azael Avalos");
0020 MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
0021 MODULE_LICENSE("GPL");
0022
0023 #define WMI_EVENT_GUID  "59142400-C6A3-40FA-BADB-8A2652834100"
0024
0025 MODULE_ALIAS("wmi:"WMI_EVENT_GUID);
0026
0027 static struct input_dev *toshiba_wmi_input_dev;
0028
0029 static const struct key_entry toshiba_wmi_keymap[] __initconst = {
0030     /* TODO: Add keymap values once found... */
0031     /*{ KE_KEY, 0x00, { KEY_ } },*/
0032     { KE_END, 0 }
0033 };
0034
0035 static void toshiba_wmi_notify(u32 value, void *context)
0036 {
0037     struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
0038     union acpi_object *obj;
0039     acpi_status status;
0040
0041     status = wmi_get_event_data(value, &response);
0042     if (ACPI_FAILURE(status)) {
0043         pr_err("Bad event status 0x%x\n", status);
0044         return;
0045     }
0046
0047     obj = (union acpi_object *)response.pointer;
0048     if (!obj)
0049         return;
0050
0051     /* TODO: Add proper checks once we have data */
0052     pr_debug("Unknown event received, obj type %x\n", obj->type);
0053
0054     kfree(response.pointer);
0055 }
0056
0057 static const struct dmi_system_id toshiba_wmi_dmi_table[] __initconst = {
0058     {
0059         .ident = "Toshiba laptop",
0060         .matches = {
0061             DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
0062         },
0063     },
0064     {}
0065 };
0066
0067 static int __init toshiba_wmi_input_setup(void)
0068 {
0069     acpi_status status;
0070     int err;
0071
0072     toshiba_wmi_input_dev = input_allocate_device();
0073     if (!toshiba_wmi_input_dev)
0074         return -ENOMEM;
0075
0076     toshiba_wmi_input_dev->name = "Toshiba WMI hotkeys";
0077     toshiba_wmi_input_dev->phys = "wmi/input0";
0078     toshiba_wmi_input_dev->id.bustype = BUS_HOST;
0079
0080     err = sparse_keymap_setup(toshiba_wmi_input_dev,
0081                   toshiba_wmi_keymap, NULL);
0082     if (err)
0083         goto err_free_dev;
0084
0085     status = wmi_install_notify_handler(WMI_EVENT_GUID,
0086                         toshiba_wmi_notify, NULL);
0087     if (ACPI_FAILURE(status)) {
0088         err = -EIO;
0089         goto err_free_dev;
0090     }
0091
0092     err = input_register_device(toshiba_wmi_input_dev);
0093     if (err)
0094         goto err_remove_notifier;
0095
0096     return 0;
0097
0098  err_remove_notifier:
0099     wmi_remove_notify_handler(WMI_EVENT_GUID);
0100  err_free_dev:
0101     input_free_device(toshiba_wmi_input_dev);
0102     return err;
0103 }
0104
0105 static void toshiba_wmi_input_destroy(void)
0106 {
0107     wmi_remove_notify_handler(WMI_EVENT_GUID);
0108     input_unregister_device(toshiba_wmi_input_dev);
0109 }
0110
0111 static int __init toshiba_wmi_init(void)
0112 {
0113     int ret;
0114
0115     if (!wmi_has_guid(WMI_EVENT_GUID) ||
0116         !dmi_check_system(toshiba_wmi_dmi_table))
0117         return -ENODEV;
0118
0119     ret = toshiba_wmi_input_setup();
0120     if (ret) {
0121         pr_err("Failed to setup input device\n");
0122         return ret;
0123     }
0124
0125     pr_info("Toshiba WMI Hotkey Driver\n");
0126
0127     return 0;
0128 }
0129
0130 static void __exit toshiba_wmi_exit(void)
0131 {
0132     if (wmi_has_guid(WMI_EVENT_GUID))
0133         toshiba_wmi_input_destroy();
0134 }
0135
0136 module_init(toshiba_wmi_init);
0137 module_exit(toshiba_wmi_exit);