drivers/platform/x86/eeepc-wmi.c

   1 /*
   2  * Eee PC WMI hotkey driver
   3  *
   4  * Copyright(C) 2010 Intel Corporation.
   5  *
   6  * Portions based on wistron_btns.c:
   7  * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
   8  * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
   9  * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, write to the Free Software
  23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/types.h>
  32 #include <linux/slab.h>
  33 #include <linux/input.h>
  34 #include <linux/input/sparse-keymap.h>
  35 #include <acpi/acpi_bus.h>
  36 #include <acpi/acpi_drivers.h>
  37
  38 MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>");
  39 MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver");
  40 MODULE_LICENSE("GPL");
  41
  42 #define EEEPC_WMI_EVENT_GUID    "ABBC0F72-8EA1-11D1-00A0-C90629100000"
  43
  44 MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);
  45
  46 #define NOTIFY_BRNUP_MIN        0x11
  47 #define NOTIFY_BRNUP_MAX        0x1f
  48 #define NOTIFY_BRNDOWN_MIN      0x20
  49 #define NOTIFY_BRNDOWN_MAX      0x2e
  50
  51 static const struct key_entry eeepc_wmi_keymap[] = {
  52         /* Sleep already handled via generic ACPI code */
  53         { KE_KEY, 0x5d, { KEY_WLAN } },
  54         { KE_KEY, 0x32, { KEY_MUTE } },
  55         { KE_KEY, 0x31, { KEY_VOLUMEDOWN } },
  56         { KE_KEY, 0x30, { KEY_VOLUMEUP } },
  57         { KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } },
  58         { KE_IGNORE, NOTIFY_BRNUP_MIN, { KEY_BRIGHTNESSUP } },
  59         { KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } },
  60         { KE_END, 0},
  61 };
  62
  63 struct eeepc_wmi {
  64         struct input_dev *inputdev;
  65 };
  66
  67 static struct eeepc_wmi *eeepc;
  68
  69 static void eeepc_wmi_notify(u32 value, void *context)
  70 {
  71         struct eeepc_wmi *eeepc = context;
  72         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
  73         union acpi_object *obj;
  74         acpi_status status;
  75         int code;
  76
  77         status = wmi_get_event_data(value, &response);
  78         if (status != AE_OK) {
  79                 pr_err("bad event status 0x%x\n", status);
  80                 return;
  81         }
  82
  83         obj = (union acpi_object *)response.pointer;
  84
  85         if (obj && obj->type == ACPI_TYPE_INTEGER) {
  86                 code = obj->integer.value;
  87
  88                 if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
  89                         code = NOTIFY_BRNUP_MIN;
  90                 else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
  91                         code = NOTIFY_BRNDOWN_MIN;
  92
  93                 if (!sparse_keymap_report_event(eeepc->inputdev,
  94                                                 code, 1, true))
  95                         pr_info("Unknown key %x pressed\n", code);
  96         }
  97
  98         kfree(obj);
  99 }
 100
 101 static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc)
 102 {
 103         int err;
 104
 105         eeepc->inputdev = input_allocate_device();
 106         if (!eeepc->inputdev)
 107                 return -ENOMEM;
 108
 109         eeepc->inputdev->name = "Eee PC WMI hotkeys";
 110         eeepc->inputdev->phys = "wmi/input0";
 111         eeepc->inputdev->id.bustype = BUS_HOST;
 112
 113         err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL);
 114         if (err)
 115                 goto err_free_dev;
 116
 117         err = input_register_device(eeepc->inputdev);
 118         if (err)
 119                 goto err_free_keymap;
 120
 121         return 0;
 122
 123 err_free_keymap:
 124         sparse_keymap_free(eeepc->inputdev);
 125 err_free_dev:
 126         input_free_device(eeepc->inputdev);
 127         return err;
 128 }
 129
 130 static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc)
 131 {
 132         if (eeepc->inputdev) {
 133                 sparse_keymap_free(eeepc->inputdev);
 134                 input_unregister_device(eeepc->inputdev);
 135         }
 136
 137         eeepc->inputdev = NULL;
 138 }
 139
 140 static int __init eeepc_wmi_init(void)
 141 {
 142         int err;
 143         acpi_status status;
 144
 145         if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID)) {
 146                 pr_warning("No known WMI GUID found\n");
 147                 return -ENODEV;
 148         }
 149
 150         eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL);
 151         if (!eeepc)
 152                 return -ENOMEM;
 153
 154         err = eeepc_wmi_input_init(eeepc);
 155         if (err) {
 156                 kfree(eeepc);
 157                 return err;
 158         }
 159
 160         status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
 161                                         eeepc_wmi_notify, eeepc);
 162         if (ACPI_FAILURE(status)) {
 163                 pr_err("Unable to register notify handler - %d\n",
 164                         status);
 165                 eeepc_wmi_input_exit(eeepc);
 166                 kfree(eeepc);
 167                 return -ENODEV;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static void __exit eeepc_wmi_exit(void)
 174 {
 175         wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
 176         eeepc_wmi_input_exit(eeepc);
 177         kfree(eeepc);
 178 }
 179
 180 module_init(eeepc_wmi_init);
 181 module_exit(eeepc_wmi_exit);