drivers/platform/x86/dell-wmi.c - kernel/prism - Git at Google

 /*
  * 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/types.h>
 #include <linux/input.h>
 #include <acpi/acpi_drivers.h>
 #include <linux/acpi.h>
 #include <linux/string.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"

 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_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_DISPLAYTOGGLE},

 	{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 struct input_dev *dell_wmi_input_dev;

 static struct key_entry *dell_wmi_get_entry_by_scancode(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(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, int scancode,
 			       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, int scancode, int keycode)
 {
 	struct key_entry *key;
 	int old_keycode;

 	if (keycode < 0 || keycode > KEY_MAX)
 		return -EINVAL;

 	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 *buffer = (int *)obj->buffer.pointer;
 		/*
 		 *  The upper bytes of the event may contain
 		 *  additional information, so mask them off for the
 		 *  scancode lookup
 		 */
 		key = dell_wmi_get_entry_by_scancode(buffer[1] & 0xFFFF);
 		if (key) {
 			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);
 		} else if (buffer[1] & 0xFFFF)
 			printk(KERN_INFO "dell-wmi: Unknown key %x pressed\n",
 			       buffer[1] & 0xFFFF);
 	}
 	kfree(obj);
 }

 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;

 	if (wmi_has_guid(DELL_EVENT_GUID)) {
 		err = dell_wmi_input_setup();

 		if (err)
 			return err;

 		err = wmi_install_notify_handler(DELL_EVENT_GUID,
 						 dell_wmi_notify, NULL);
 		if (err) {
 			input_unregister_device(dell_wmi_input_dev);
 			printk(KERN_ERR "dell-wmi: Unable to register"
 			       " notify handler - %d\n", err);
 			return err;
 		}

 	} else
 		printk(KERN_WARNING "dell-wmi: No known WMI GUID found\n");

 	return 0;
 }

 static void __exit dell_wmi_exit(void)
 {
 	if (wmi_has_guid(DELL_EVENT_GUID)) {
 		wmi_remove_notify_handler(DELL_EVENT_GUID);
 		input_unregister_device(dell_wmi_input_dev);
 	}
 }

 module_init(dell_wmi_init);
 module_exit(dell_wmi_exit);
	/*
	* 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/types.h>
	#include <linux/input.h>
	#include <acpi/acpi_drivers.h>
	#include <linux/acpi.h>
	#include <linux/string.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"

	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_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_DISPLAYTOGGLE},

	{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 struct input_dev *dell_wmi_input_dev;

	static struct key_entry *dell_wmi_get_entry_by_scancode(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(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, int scancode,
	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, int scancode, int keycode)
	{
	struct key_entry *key;
	int old_keycode;

	if (keycode < 0 \|\| keycode > KEY_MAX)
	return -EINVAL;

	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 buffer = (int )obj->buffer.pointer;
	/*
	* The upper bytes of the event may contain
	* additional information, so mask them off for the
	* scancode lookup
	*/
	key = dell_wmi_get_entry_by_scancode(buffer[1] & 0xFFFF);
	if (key) {
	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);
	} else if (buffer[1] & 0xFFFF)
	printk(KERN_INFO "dell-wmi: Unknown key %x pressed\n",
	buffer[1] & 0xFFFF);
	}
	kfree(obj);
	}

	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;

	if (wmi_has_guid(DELL_EVENT_GUID)) {
	err = dell_wmi_input_setup();

	if (err)
	return err;

	err = wmi_install_notify_handler(DELL_EVENT_GUID,
	dell_wmi_notify, NULL);
	if (err) {
	input_unregister_device(dell_wmi_input_dev);
	printk(KERN_ERR "dell-wmi: Unable to register"
	" notify handler - %d\n", err);
	return err;
	}

	} else
	printk(KERN_WARNING "dell-wmi: No known WMI GUID found\n");

	return 0;
	}

	static void __exit dell_wmi_exit(void)
	{
	if (wmi_has_guid(DELL_EVENT_GUID)) {
	wmi_remove_notify_handler(DELL_EVENT_GUID);
	input_unregister_device(dell_wmi_input_dev);
	}
	}

	module_init(dell_wmi_init);
	module_exit(dell_wmi_exit);