265 lines
6.7 KiB
C
265 lines
6.7 KiB
C
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/*
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* Dell WMI hotkeys
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*
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* Copyright (C) 2008 Red Hat <mjg@redhat.com>
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*
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* Portions based on wistron_btns.c:
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* Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
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* Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
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* Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/input.h>
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#include <acpi/acpi_drivers.h>
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#include <linux/acpi.h>
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#include <linux/string.h>
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MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
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MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
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MODULE_LICENSE("GPL");
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#define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
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MODULE_ALIAS("wmi:"DELL_EVENT_GUID);
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struct key_entry {
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char type; /* See KE_* below */
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u16 code;
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u16 keycode;
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};
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enum { KE_KEY, KE_SW, KE_IGNORE, KE_END };
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/*
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* Certain keys are flagged as KE_IGNORE. All of these are either
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* notifications (rather than requests for change) or are also sent
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* via the keyboard controller so should not be sent again.
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*/
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static struct key_entry dell_wmi_keymap[] = {
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{KE_KEY, 0xe045, KEY_PROG1},
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{KE_KEY, 0xe009, KEY_EJECTCD},
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/* These also contain the brightness level at offset 6 */
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{KE_KEY, 0xe006, KEY_BRIGHTNESSUP},
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{KE_KEY, 0xe005, KEY_BRIGHTNESSDOWN},
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/* Battery health status button */
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{KE_KEY, 0xe007, KEY_BATTERY},
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/* This is actually for all radios. Although physically a
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* switch, the notification does not provide an indication of
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* state and so it should be reported as a key */
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{KE_KEY, 0xe008, KEY_WLAN},
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/* The next device is at offset 6, the active devices are at
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offset 8 and the attached devices at offset 10 */
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{KE_KEY, 0xe00b, KEY_DISPLAYTOGGLE},
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{KE_IGNORE, 0xe00c, KEY_KBDILLUMTOGGLE},
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/* BIOS error detected */
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{KE_IGNORE, 0xe00d, KEY_RESERVED},
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/* Wifi Catcher */
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{KE_KEY, 0xe011, KEY_PROG2},
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/* Ambient light sensor toggle */
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{KE_IGNORE, 0xe013, KEY_RESERVED},
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{KE_IGNORE, 0xe020, KEY_MUTE},
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{KE_IGNORE, 0xe02e, KEY_VOLUMEDOWN},
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{KE_IGNORE, 0xe030, KEY_VOLUMEUP},
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{KE_IGNORE, 0xe033, KEY_KBDILLUMUP},
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{KE_IGNORE, 0xe034, KEY_KBDILLUMDOWN},
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{KE_IGNORE, 0xe03a, KEY_CAPSLOCK},
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{KE_IGNORE, 0xe045, KEY_NUMLOCK},
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{KE_IGNORE, 0xe046, KEY_SCROLLLOCK},
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{KE_END, 0}
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};
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static struct input_dev *dell_wmi_input_dev;
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static struct key_entry *dell_wmi_get_entry_by_scancode(int code)
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{
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struct key_entry *key;
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for (key = dell_wmi_keymap; key->type != KE_END; key++)
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if (code == key->code)
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return key;
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return NULL;
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}
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static struct key_entry *dell_wmi_get_entry_by_keycode(int keycode)
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{
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struct key_entry *key;
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for (key = dell_wmi_keymap; key->type != KE_END; key++)
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if (key->type == KE_KEY && keycode == key->keycode)
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return key;
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return NULL;
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}
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static int dell_wmi_getkeycode(struct input_dev *dev, int scancode,
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int *keycode)
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{
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struct key_entry *key = dell_wmi_get_entry_by_scancode(scancode);
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if (key && key->type == KE_KEY) {
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*keycode = key->keycode;
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return 0;
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}
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return -EINVAL;
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}
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static int dell_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
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{
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struct key_entry *key;
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int old_keycode;
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if (keycode < 0 || keycode > KEY_MAX)
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return -EINVAL;
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key = dell_wmi_get_entry_by_scancode(scancode);
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if (key && key->type == KE_KEY) {
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old_keycode = key->keycode;
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key->keycode = keycode;
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set_bit(keycode, dev->keybit);
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if (!dell_wmi_get_entry_by_keycode(old_keycode))
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clear_bit(old_keycode, dev->keybit);
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return 0;
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}
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return -EINVAL;
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}
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static void dell_wmi_notify(u32 value, void *context)
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{
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struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
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static struct key_entry *key;
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union acpi_object *obj;
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acpi_status status;
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status = wmi_get_event_data(value, &response);
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if (status != AE_OK) {
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printk(KERN_INFO "dell-wmi: bad event status 0x%x\n", status);
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return;
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}
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obj = (union acpi_object *)response.pointer;
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if (obj && obj->type == ACPI_TYPE_BUFFER) {
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int *buffer = (int *)obj->buffer.pointer;
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/*
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* The upper bytes of the event may contain
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* additional information, so mask them off for the
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* scancode lookup
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*/
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key = dell_wmi_get_entry_by_scancode(buffer[1] & 0xFFFF);
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if (key) {
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input_report_key(dell_wmi_input_dev, key->keycode, 1);
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input_sync(dell_wmi_input_dev);
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input_report_key(dell_wmi_input_dev, key->keycode, 0);
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input_sync(dell_wmi_input_dev);
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} else if (buffer[1] & 0xFFFF)
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printk(KERN_INFO "dell-wmi: Unknown key %x pressed\n",
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buffer[1] & 0xFFFF);
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}
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kfree(obj);
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}
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static int __init dell_wmi_input_setup(void)
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{
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struct key_entry *key;
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int err;
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dell_wmi_input_dev = input_allocate_device();
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if (!dell_wmi_input_dev)
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return -ENOMEM;
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dell_wmi_input_dev->name = "Dell WMI hotkeys";
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dell_wmi_input_dev->phys = "wmi/input0";
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dell_wmi_input_dev->id.bustype = BUS_HOST;
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dell_wmi_input_dev->getkeycode = dell_wmi_getkeycode;
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dell_wmi_input_dev->setkeycode = dell_wmi_setkeycode;
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for (key = dell_wmi_keymap; key->type != KE_END; key++) {
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switch (key->type) {
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case KE_KEY:
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set_bit(EV_KEY, dell_wmi_input_dev->evbit);
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set_bit(key->keycode, dell_wmi_input_dev->keybit);
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break;
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case KE_SW:
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set_bit(EV_SW, dell_wmi_input_dev->evbit);
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set_bit(key->keycode, dell_wmi_input_dev->swbit);
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break;
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}
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}
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err = input_register_device(dell_wmi_input_dev);
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if (err) {
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input_free_device(dell_wmi_input_dev);
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return err;
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}
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return 0;
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}
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static int __init dell_wmi_init(void)
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{
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int err;
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if (wmi_has_guid(DELL_EVENT_GUID)) {
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err = dell_wmi_input_setup();
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if (err)
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return err;
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err = wmi_install_notify_handler(DELL_EVENT_GUID,
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dell_wmi_notify, NULL);
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if (err) {
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input_unregister_device(dell_wmi_input_dev);
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printk(KERN_ERR "dell-wmi: Unable to register"
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" notify handler - %d\n", err);
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return err;
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}
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} else
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printk(KERN_WARNING "dell-wmi: No known WMI GUID found\n");
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return 0;
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}
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static void __exit dell_wmi_exit(void)
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{
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if (wmi_has_guid(DELL_EVENT_GUID)) {
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wmi_remove_notify_handler(DELL_EVENT_GUID);
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input_unregister_device(dell_wmi_input_dev);
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}
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}
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module_init(dell_wmi_init);
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module_exit(dell_wmi_exit);
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