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- /*
- * Dell WMI hotkeys
- *
- * Copyright (C) 2008 Red Hat <mjg@redhat.com>
- *
- * 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/slab.h>
- #include <linux/types.h>
- #include <linux/input.h>
- #include <acpi/acpi_drivers.h>
- #include <linux/acpi.h>
- #include <linux/string.h>
- #include <linux/dmi.h>
- MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
- MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
- MODULE_LICENSE("GPL");
- #define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
- static int acpi_video;
- MODULE_ALIAS("wmi:"DELL_EVENT_GUID);
- struct key_entry {
- char type; /* See KE_* below */
- u16 code;
- u16 keycode;
- };
- enum { KE_KEY, KE_SW, KE_IGNORE, KE_END };
- /*
- * Certain keys are flagged as KE_IGNORE. All of these are either
- * notifications (rather than requests for change) or are also sent
- * via the keyboard controller so should not be sent again.
- */
- static struct key_entry dell_legacy_wmi_keymap[] = {
- {KE_KEY, 0xe045, KEY_PROG1},
- {KE_KEY, 0xe009, KEY_EJECTCD},
- /* These also contain the brightness level at offset 6 */
- {KE_KEY, 0xe006, KEY_BRIGHTNESSUP},
- {KE_KEY, 0xe005, KEY_BRIGHTNESSDOWN},
- /* Battery health status button */
- {KE_KEY, 0xe007, KEY_BATTERY},
- /* This is actually for all radios. Although physically a
- * switch, the notification does not provide an indication of
- * state and so it should be reported as a key */
- {KE_KEY, 0xe008, KEY_WLAN},
- /* The next device is at offset 6, the active devices are at
- offset 8 and the attached devices at offset 10 */
- {KE_KEY, 0xe00b, KEY_SWITCHVIDEOMODE},
- {KE_IGNORE, 0xe00c, KEY_KBDILLUMTOGGLE},
- /* BIOS error detected */
- {KE_IGNORE, 0xe00d, KEY_RESERVED},
- /* Wifi Catcher */
- {KE_KEY, 0xe011, KEY_PROG2},
- /* Ambient light sensor toggle */
- {KE_IGNORE, 0xe013, KEY_RESERVED},
- {KE_IGNORE, 0xe020, KEY_MUTE},
- {KE_IGNORE, 0xe02e, KEY_VOLUMEDOWN},
- {KE_IGNORE, 0xe030, KEY_VOLUMEUP},
- {KE_IGNORE, 0xe033, KEY_KBDILLUMUP},
- {KE_IGNORE, 0xe034, KEY_KBDILLUMDOWN},
- {KE_IGNORE, 0xe03a, KEY_CAPSLOCK},
- {KE_IGNORE, 0xe045, KEY_NUMLOCK},
- {KE_IGNORE, 0xe046, KEY_SCROLLLOCK},
- {KE_END, 0}
- };
- static bool dell_new_hk_type;
- struct dell_new_keymap_entry {
- u16 scancode;
- u16 keycode;
- };
- struct dell_hotkey_table {
- struct dmi_header header;
- struct dell_new_keymap_entry keymap[];
- };
- static struct key_entry *dell_new_wmi_keymap;
- static u16 bios_to_linux_keycode[256] = {
- KEY_MEDIA, KEY_NEXTSONG, KEY_PLAYPAUSE, KEY_PREVIOUSSONG,
- KEY_STOPCD, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
- KEY_WWW, KEY_UNKNOWN, KEY_VOLUMEDOWN, KEY_MUTE,
- KEY_VOLUMEUP, KEY_UNKNOWN, KEY_BATTERY, KEY_EJECTCD,
- KEY_UNKNOWN, KEY_SLEEP, KEY_PROG1, KEY_BRIGHTNESSDOWN,
- KEY_BRIGHTNESSUP, KEY_UNKNOWN, KEY_KBDILLUMTOGGLE,
- KEY_UNKNOWN, KEY_SWITCHVIDEOMODE, KEY_UNKNOWN, KEY_UNKNOWN,
- KEY_SWITCHVIDEOMODE, KEY_UNKNOWN, KEY_UNKNOWN, KEY_PROG2,
- KEY_UNKNOWN, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- KEY_PROG3
- };
- static struct key_entry *dell_wmi_keymap = dell_legacy_wmi_keymap;
- static struct input_dev *dell_wmi_input_dev;
- static struct key_entry *dell_wmi_get_entry_by_scancode(unsigned int code)
- {
- struct key_entry *key;
- for (key = dell_wmi_keymap; key->type != KE_END; key++)
- if (code == key->code)
- return key;
- return NULL;
- }
- static struct key_entry *dell_wmi_get_entry_by_keycode(unsigned int keycode)
- {
- struct key_entry *key;
- for (key = dell_wmi_keymap; key->type != KE_END; key++)
- if (key->type == KE_KEY && keycode == key->keycode)
- return key;
- return NULL;
- }
- static int dell_wmi_getkeycode(struct input_dev *dev,
- unsigned int scancode, unsigned int *keycode)
- {
- struct key_entry *key = dell_wmi_get_entry_by_scancode(scancode);
- if (key && key->type == KE_KEY) {
- *keycode = key->keycode;
- return 0;
- }
- return -EINVAL;
- }
- static int dell_wmi_setkeycode(struct input_dev *dev,
- unsigned int scancode, unsigned int keycode)
- {
- struct key_entry *key;
- unsigned int old_keycode;
- key = dell_wmi_get_entry_by_scancode(scancode);
- if (key && key->type == KE_KEY) {
- old_keycode = key->keycode;
- key->keycode = keycode;
- set_bit(keycode, dev->keybit);
- if (!dell_wmi_get_entry_by_keycode(old_keycode))
- clear_bit(old_keycode, dev->keybit);
- return 0;
- }
- return -EINVAL;
- }
- static void dell_wmi_notify(u32 value, void *context)
- {
- struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
- static struct key_entry *key;
- union acpi_object *obj;
- acpi_status status;
- status = wmi_get_event_data(value, &response);
- if (status != AE_OK) {
- printk(KERN_INFO "dell-wmi: bad event status 0x%x\n", status);
- return;
- }
- obj = (union acpi_object *)response.pointer;
- if (obj && obj->type == ACPI_TYPE_BUFFER) {
- int reported_key;
- u16 *buffer_entry = (u16 *)obj->buffer.pointer;
- if (dell_new_hk_type && (buffer_entry[1] != 0x10)) {
- printk(KERN_INFO "dell-wmi: Received unknown WMI event"
- " (0x%x)\n", buffer_entry[1]);
- kfree(obj);
- return;
- }
- if (dell_new_hk_type || buffer_entry[1] == 0x0)
- reported_key = (int)buffer_entry[2];
- else
- reported_key = (int)buffer_entry[1] & 0xffff;
- key = dell_wmi_get_entry_by_scancode(reported_key);
- if (!key) {
- printk(KERN_INFO "dell-wmi: Unknown key %x pressed\n",
- reported_key);
- } else if ((key->keycode == KEY_BRIGHTNESSUP ||
- key->keycode == KEY_BRIGHTNESSDOWN) && acpi_video) {
- /* Don't report brightness notifications that will also
- * come via ACPI */
- ;
- } else {
- input_report_key(dell_wmi_input_dev, key->keycode, 1);
- input_sync(dell_wmi_input_dev);
- input_report_key(dell_wmi_input_dev, key->keycode, 0);
- input_sync(dell_wmi_input_dev);
- }
- }
- kfree(obj);
- }
- static void setup_new_hk_map(const struct dmi_header *dm)
- {
- int i;
- int hotkey_num = (dm->length-4)/sizeof(struct dell_new_keymap_entry);
- struct dell_hotkey_table *table =
- container_of(dm, struct dell_hotkey_table, header);
- dell_new_wmi_keymap = kzalloc((hotkey_num+1) *
- sizeof(struct key_entry), GFP_KERNEL);
- for (i = 0; i < hotkey_num; i++) {
- dell_new_wmi_keymap[i].type = KE_KEY;
- dell_new_wmi_keymap[i].code = table->keymap[i].scancode;
- dell_new_wmi_keymap[i].keycode =
- (table->keymap[i].keycode > 255) ? 0 :
- bios_to_linux_keycode[table->keymap[i].keycode];
- }
- dell_new_wmi_keymap[i].type = KE_END;
- dell_new_wmi_keymap[i].code = 0;
- dell_new_wmi_keymap[i].keycode = 0;
- dell_wmi_keymap = dell_new_wmi_keymap;
- }
- static void find_hk_type(const struct dmi_header *dm, void *dummy)
- {
- if ((dm->type == 0xb2) && (dm->length > 6)) {
- dell_new_hk_type = true;
- setup_new_hk_map(dm);
- }
- }
- static int __init dell_wmi_input_setup(void)
- {
- struct key_entry *key;
- int err;
- dell_wmi_input_dev = input_allocate_device();
- if (!dell_wmi_input_dev)
- return -ENOMEM;
- dell_wmi_input_dev->name = "Dell WMI hotkeys";
- dell_wmi_input_dev->phys = "wmi/input0";
- dell_wmi_input_dev->id.bustype = BUS_HOST;
- dell_wmi_input_dev->getkeycode = dell_wmi_getkeycode;
- dell_wmi_input_dev->setkeycode = dell_wmi_setkeycode;
- for (key = dell_wmi_keymap; key->type != KE_END; key++) {
- switch (key->type) {
- case KE_KEY:
- set_bit(EV_KEY, dell_wmi_input_dev->evbit);
- set_bit(key->keycode, dell_wmi_input_dev->keybit);
- break;
- case KE_SW:
- set_bit(EV_SW, dell_wmi_input_dev->evbit);
- set_bit(key->keycode, dell_wmi_input_dev->swbit);
- break;
- }
- }
- err = input_register_device(dell_wmi_input_dev);
- if (err) {
- input_free_device(dell_wmi_input_dev);
- return err;
- }
- return 0;
- }
- static int __init dell_wmi_init(void)
- {
- int err;
- acpi_status status;
- if (!wmi_has_guid(DELL_EVENT_GUID)) {
- printk(KERN_WARNING "dell-wmi: No known WMI GUID found\n");
- return -ENODEV;
- }
- dmi_walk(find_hk_type, NULL);
- acpi_video = acpi_video_backlight_support();
- err = dell_wmi_input_setup();
- if (err) {
- if (dell_new_hk_type)
- kfree(dell_wmi_keymap);
- return err;
- }
- status = wmi_install_notify_handler(DELL_EVENT_GUID,
- dell_wmi_notify, NULL);
- if (ACPI_FAILURE(status)) {
- input_unregister_device(dell_wmi_input_dev);
- if (dell_new_hk_type)
- kfree(dell_wmi_keymap);
- printk(KERN_ERR
- "dell-wmi: Unable to register notify handler - %d\n",
- status);
- return -ENODEV;
- }
- return 0;
- }
- static void __exit dell_wmi_exit(void)
- {
- wmi_remove_notify_handler(DELL_EVENT_GUID);
- input_unregister_device(dell_wmi_input_dev);
- if (dell_new_hk_type)
- kfree(dell_wmi_keymap);
- }
- module_init(dell_wmi_init);
- module_exit(dell_wmi_exit);
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