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linux-next/drivers/platform/x86/dell-wmi-aio.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

198 lines
4.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* WMI hotkeys support for Dell All-In-One series
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/acpi.h>
#include <linux/string.h>
MODULE_DESCRIPTION("WMI hotkeys driver for Dell All-In-One series");
MODULE_LICENSE("GPL");
#define EVENT_GUID1 "284A0E6B-380E-472A-921F-E52786257FB4"
#define EVENT_GUID2 "02314822-307C-4F66-BF0E-48AEAEB26CC8"
struct dell_wmi_event {
u16 length;
/* 0x000: A hot key pressed or an event occurred
* 0x00F: A sequence of hot keys are pressed */
u16 type;
u16 event[];
};
static const char *dell_wmi_aio_guids[] = {
EVENT_GUID1,
EVENT_GUID2,
NULL
};
MODULE_ALIAS("wmi:"EVENT_GUID1);
MODULE_ALIAS("wmi:"EVENT_GUID2);
static const struct key_entry dell_wmi_aio_keymap[] = {
{ KE_KEY, 0xc0, { KEY_VOLUMEUP } },
{ KE_KEY, 0xc1, { KEY_VOLUMEDOWN } },
{ KE_KEY, 0xe030, { KEY_VOLUMEUP } },
{ KE_KEY, 0xe02e, { KEY_VOLUMEDOWN } },
{ KE_KEY, 0xe020, { KEY_MUTE } },
{ KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } },
{ KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } },
{ KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } },
{ KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } },
{ KE_END, 0 }
};
static struct input_dev *dell_wmi_aio_input_dev;
/*
* The new WMI event data format will follow the dell_wmi_event structure
* So, we will check if the buffer matches the format
*/
static bool dell_wmi_aio_event_check(u8 *buffer, int length)
{
struct dell_wmi_event *event = (struct dell_wmi_event *)buffer;
if (event == NULL || length < 6)
return false;
if ((event->type == 0 || event->type == 0xf) &&
event->length >= 2)
return true;
return false;
}
static void dell_wmi_aio_notify(u32 value, void *context)
{
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
struct dell_wmi_event *event;
acpi_status status;
status = wmi_get_event_data(value, &response);
if (status != AE_OK) {
pr_info("bad event status 0x%x\n", status);
return;
}
obj = (union acpi_object *)response.pointer;
if (obj) {
unsigned int scancode = 0;
switch (obj->type) {
case ACPI_TYPE_INTEGER:
/* Most All-In-One correctly return integer scancode */
scancode = obj->integer.value;
sparse_keymap_report_event(dell_wmi_aio_input_dev,
scancode, 1, true);
break;
case ACPI_TYPE_BUFFER:
if (dell_wmi_aio_event_check(obj->buffer.pointer,
obj->buffer.length)) {
event = (struct dell_wmi_event *)
obj->buffer.pointer;
scancode = event->event[0];
} else {
/* Broken machines return the scancode in a
buffer */
if (obj->buffer.pointer &&
obj->buffer.length > 0)
scancode = obj->buffer.pointer[0];
}
if (scancode)
sparse_keymap_report_event(
dell_wmi_aio_input_dev,
scancode, 1, true);
break;
}
}
kfree(obj);
}
static int __init dell_wmi_aio_input_setup(void)
{
int err;
dell_wmi_aio_input_dev = input_allocate_device();
if (!dell_wmi_aio_input_dev)
return -ENOMEM;
dell_wmi_aio_input_dev->name = "Dell AIO WMI hotkeys";
dell_wmi_aio_input_dev->phys = "wmi/input0";
dell_wmi_aio_input_dev->id.bustype = BUS_HOST;
err = sparse_keymap_setup(dell_wmi_aio_input_dev,
dell_wmi_aio_keymap, NULL);
if (err) {
pr_err("Unable to setup input device keymap\n");
goto err_free_dev;
}
err = input_register_device(dell_wmi_aio_input_dev);
if (err) {
pr_info("Unable to register input device\n");
goto err_free_dev;
}
return 0;
err_free_dev:
input_free_device(dell_wmi_aio_input_dev);
return err;
}
static const char *dell_wmi_aio_find(void)
{
int i;
for (i = 0; dell_wmi_aio_guids[i] != NULL; i++)
if (wmi_has_guid(dell_wmi_aio_guids[i]))
return dell_wmi_aio_guids[i];
return NULL;
}
static int __init dell_wmi_aio_init(void)
{
int err;
const char *guid;
guid = dell_wmi_aio_find();
if (!guid) {
pr_warn("No known WMI GUID found\n");
return -ENXIO;
}
err = dell_wmi_aio_input_setup();
if (err)
return err;
err = wmi_install_notify_handler(guid, dell_wmi_aio_notify, NULL);
if (err) {
pr_err("Unable to register notify handler - %d\n", err);
input_unregister_device(dell_wmi_aio_input_dev);
return err;
}
return 0;
}
static void __exit dell_wmi_aio_exit(void)
{
const char *guid;
guid = dell_wmi_aio_find();
wmi_remove_notify_handler(guid);
input_unregister_device(dell_wmi_aio_input_dev);
}
module_init(dell_wmi_aio_init);
module_exit(dell_wmi_aio_exit);