/*
* Eee PC WMI hotkey driver
*
* Copyright(C) 2010 Intel Corporation.
*
* Portions based on wistron_btns.c:
* Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
* Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
* Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
*
* 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
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>");
MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver");
MODULE_LICENSE("GPL");
#define EEEPC_WMI_EVENT_GUID "ABBC0F72-8EA1-11D1-00A0-C90629100000"
MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);
#define NOTIFY_BRNUP_MIN 0x11
#define NOTIFY_BRNUP_MAX 0x1f
#define NOTIFY_BRNDOWN_MIN 0x20
#define NOTIFY_BRNDOWN_MAX 0x2e
static const struct key_entry eeepc_wmi_keymap[] = {
/* Sleep already handled via generic ACPI code */
{ KE_KEY, 0x5d, { KEY_WLAN } },
{ KE_KEY, 0x32, { KEY_MUTE } },
{ KE_KEY, 0x31, { KEY_VOLUMEDOWN } },
{ KE_KEY, 0x30, { KEY_VOLUMEUP } },
{ KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } },
{ KE_IGNORE, NOTIFY_BRNUP_MIN, { KEY_BRIGHTNESSUP } },
{ KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } },
{ KE_END, 0},
};
static struct input_dev *eeepc_wmi_input_dev;
static void eeepc_wmi_notify(u32 value, void *context)
{
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
acpi_status status;
int code;
status = wmi_get_event_data(value, &response);
if (status != AE_OK) {
pr_err("EEEPC WMI: bad event status 0x%x\n", status);
return;
}
obj = (union acpi_object *)response.pointer;
if (obj && obj->type == ACPI_TYPE_INTEGER) {
code = obj->integer.value;
if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
code = NOTIFY_BRNUP_MIN;
else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
code = NOTIFY_BRNDOWN_MIN;
if (!sparse_keymap_report_event(eeepc_wmi_input_dev,
code, 1, true))
pr_info("EEEPC WMI: Unknown key %x pressed\n", code);
}
kfree(obj);
}
static int eeepc_wmi_input_setup(void)
{
int err;
eeepc_wmi_input_dev = input_allocate_device();
if (!eeepc_wmi_input_dev)
return -ENOMEM;
eeepc_wmi_input_dev->name = "Eee PC WMI hotkeys";
eeepc_wmi_input_dev->phys = "wmi/input0";
eeepc_wmi_input_dev->id.bustype = BUS_HOST;
err = sparse_keymap_setup(eeepc_wmi_input_dev, eeepc_wmi_keymap, NULL);
if (err)
goto err_free_dev;
err = input_register_device(eeepc_wmi_input_dev);
if (err)
goto err_free_keymap;
return 0;
err_free_keymap:
sparse_keymap_free(eeepc_wmi_input_dev);
err_free_dev:
input_free_device(eeepc_wmi_input_dev);
return err;
}
static int __init eeepc_wmi_init(void)
{
int err;
acpi_status status;
if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID)) {
pr_warning("EEEPC WMI: No known WMI GUID found\n");
return -ENODEV;
}
err = eeepc_wmi_input_setup();
if (err)
return err;
status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
eeepc_wmi_notify, NULL);
if (ACPI_FAILURE(status)) {
sparse_keymap_free(eeepc_wmi_input_dev);
input_unregister_device(eeepc_wmi_input_dev);
pr_err("EEEPC WMI: Unable to register notify handler - %d\n",
status);
return -ENODEV;
}
return 0;
}
static void __exit eeepc_wmi_exit(void)
{
wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
sparse_keymap_free(eeepc_wmi_input_dev);
input_unregister_device(eeepc_wmi_input_dev);
}
module_init(eeepc_wmi_init);
module_exit(eeepc_wmi_exit);
