2011-02-17 11:44:09 -07:00
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/*
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* WMI hotkeys support for Dell All-In-One series
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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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2011-03-29 16:21:37 -06:00
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2011-02-17 11:44:09 -07:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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 <linux/input/sparse-keymap.h>
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#include <linux/acpi.h>
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#include <linux/string.h>
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MODULE_DESCRIPTION("WMI hotkeys driver for Dell All-In-One series");
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MODULE_LICENSE("GPL");
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#define EVENT_GUID1 "284A0E6B-380E-472A-921F-E52786257FB4"
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#define EVENT_GUID2 "02314822-307C-4F66-BF0E-48AEAEB26CC8"
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2013-03-08 00:44:30 -07:00
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struct dell_wmi_event {
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u16 length;
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/* 0x000: A hot key pressed or an event occurred
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* 0x00F: A sequence of hot keys are pressed */
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u16 type;
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u16 event[];
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};
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2011-02-17 11:44:09 -07:00
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static const char *dell_wmi_aio_guids[] = {
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EVENT_GUID1,
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EVENT_GUID2,
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NULL
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};
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MODULE_ALIAS("wmi:"EVENT_GUID1);
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MODULE_ALIAS("wmi:"EVENT_GUID2);
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static const struct key_entry dell_wmi_aio_keymap[] = {
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{ KE_KEY, 0xc0, { KEY_VOLUMEUP } },
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{ KE_KEY, 0xc1, { KEY_VOLUMEDOWN } },
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2013-03-08 00:44:30 -07:00
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{ KE_KEY, 0xe030, { KEY_VOLUMEUP } },
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{ KE_KEY, 0xe02e, { KEY_VOLUMEDOWN } },
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{ KE_KEY, 0xe020, { KEY_MUTE } },
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{ KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } },
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{ KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } },
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{ KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } },
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{ KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } },
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2011-02-17 11:44:09 -07:00
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{ KE_END, 0 }
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};
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static struct input_dev *dell_wmi_aio_input_dev;
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2013-03-08 00:44:30 -07:00
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/*
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* The new WMI event data format will follow the dell_wmi_event structure
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* So, we will check if the buffer matches the format
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*/
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static bool dell_wmi_aio_event_check(u8 *buffer, int length)
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{
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struct dell_wmi_event *event = (struct dell_wmi_event *)buffer;
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if (event == NULL || length < 6)
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return false;
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if ((event->type == 0 || event->type == 0xf) &&
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event->length >= 2)
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return true;
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return false;
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}
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2011-02-17 11:44:09 -07:00
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static void dell_wmi_aio_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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union acpi_object *obj;
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2013-03-08 00:44:30 -07:00
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struct dell_wmi_event *event;
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2011-02-17 11:44:09 -07:00
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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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pr_info("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) {
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2013-03-08 00:44:30 -07:00
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unsigned int scancode = 0;
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2011-02-17 11:44:09 -07:00
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switch (obj->type) {
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case ACPI_TYPE_INTEGER:
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/* Most All-In-One correctly return integer scancode */
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scancode = obj->integer.value;
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sparse_keymap_report_event(dell_wmi_aio_input_dev,
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scancode, 1, true);
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break;
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case ACPI_TYPE_BUFFER:
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2013-03-08 00:44:30 -07:00
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if (dell_wmi_aio_event_check(obj->buffer.pointer,
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obj->buffer.length)) {
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event = (struct dell_wmi_event *)
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obj->buffer.pointer;
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scancode = event->event[0];
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} else {
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/* Broken machines return the scancode in a
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buffer */
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if (obj->buffer.pointer &&
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obj->buffer.length > 0)
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scancode = obj->buffer.pointer[0];
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}
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if (scancode)
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2011-02-17 11:44:09 -07:00
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sparse_keymap_report_event(
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dell_wmi_aio_input_dev,
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scancode, 1, true);
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break;
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}
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}
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kfree(obj);
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}
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static int __init dell_wmi_aio_input_setup(void)
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{
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int err;
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dell_wmi_aio_input_dev = input_allocate_device();
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if (!dell_wmi_aio_input_dev)
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return -ENOMEM;
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dell_wmi_aio_input_dev->name = "Dell AIO WMI hotkeys";
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dell_wmi_aio_input_dev->phys = "wmi/input0";
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dell_wmi_aio_input_dev->id.bustype = BUS_HOST;
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err = sparse_keymap_setup(dell_wmi_aio_input_dev,
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dell_wmi_aio_keymap, NULL);
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if (err) {
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pr_err("Unable to setup input device keymap\n");
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goto err_free_dev;
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}
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err = input_register_device(dell_wmi_aio_input_dev);
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if (err) {
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pr_info("Unable to register input device\n");
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goto err_free_keymap;
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}
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return 0;
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err_free_keymap:
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sparse_keymap_free(dell_wmi_aio_input_dev);
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err_free_dev:
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input_free_device(dell_wmi_aio_input_dev);
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return err;
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}
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static const char *dell_wmi_aio_find(void)
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{
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int i;
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for (i = 0; dell_wmi_aio_guids[i] != NULL; i++)
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if (wmi_has_guid(dell_wmi_aio_guids[i]))
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return dell_wmi_aio_guids[i];
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return NULL;
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}
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static int __init dell_wmi_aio_init(void)
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{
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int err;
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const char *guid;
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guid = dell_wmi_aio_find();
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if (!guid) {
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2011-03-29 16:21:37 -06:00
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pr_warn("No known WMI GUID found\n");
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2011-02-17 11:44:09 -07:00
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return -ENXIO;
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}
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err = dell_wmi_aio_input_setup();
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if (err)
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return err;
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err = wmi_install_notify_handler(guid, dell_wmi_aio_notify, NULL);
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if (err) {
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pr_err("Unable to register notify handler - %d\n", err);
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sparse_keymap_free(dell_wmi_aio_input_dev);
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input_unregister_device(dell_wmi_aio_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 void __exit dell_wmi_aio_exit(void)
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{
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const char *guid;
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guid = dell_wmi_aio_find();
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wmi_remove_notify_handler(guid);
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sparse_keymap_free(dell_wmi_aio_input_dev);
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input_unregister_device(dell_wmi_aio_input_dev);
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}
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module_init(dell_wmi_aio_init);
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module_exit(dell_wmi_aio_exit);
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