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 <linux/fb.h>
  36 #include <linux/backlight.h>
  37 #include <linux/platform_device.h>
  38 #include <acpi/acpi_bus.h>
  39 #include <acpi/acpi_drivers.h>
  40
  41 #define EEEPC_WMI_FILE  "eeepc-wmi"
  42
  43 MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>");
  44 MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver");
  45 MODULE_LICENSE("GPL");
  46
  47 #define EEEPC_WMI_EVENT_GUID    "ABBC0F72-8EA1-11D1-00A0-C90629100000"
  48 #define EEEPC_WMI_MGMT_GUID     "97845ED0-4E6D-11DE-8A39-0800200C9A66"
  49
  50 MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);
  51 MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID);
  52
  53 #define NOTIFY_BRNUP_MIN        0x11
  54 #define NOTIFY_BRNUP_MAX        0x1f
  55 #define NOTIFY_BRNDOWN_MIN      0x20
  56 #define NOTIFY_BRNDOWN_MAX      0x2e
  57
  58 #define EEEPC_WMI_METHODID_DEVS 0x53564544
  59 #define EEEPC_WMI_METHODID_DSTS 0x53544344
  60
  61 #define EEEPC_WMI_DEVID_BACKLIGHT       0x00050012
  62
  63 static const struct key_entry eeepc_wmi_keymap[] = {
  64         /* Sleep already handled via generic ACPI code */
  65         { KE_KEY, 0x5d, { KEY_WLAN } },
  66         { KE_KEY, 0x32, { KEY_MUTE } },
  67         { KE_KEY, 0x31, { KEY_VOLUMEDOWN } },
  68         { KE_KEY, 0x30, { KEY_VOLUMEUP } },
  69         { KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } },
  70         { KE_IGNORE, NOTIFY_BRNUP_MIN, { KEY_BRIGHTNESSUP } },
  71         { KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } },
  72         { KE_END, 0},
  73 };
  74
  75 struct bios_args {
  76         u32     dev_id;
  77         u32     ctrl_param;
  78 };
  79
  80 struct eeepc_wmi {
  81         struct input_dev *inputdev;
  82         struct backlight_device *backlight_device;
  83 };
  84
  85 static struct platform_device *platform_device;
  86
  87 static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc)
  88 {
  89         int err;
  90
  91         eeepc->inputdev = input_allocate_device();
  92         if (!eeepc->inputdev)
  93                 return -ENOMEM;
  94
  95         eeepc->inputdev->name = "Eee PC WMI hotkeys";
  96         eeepc->inputdev->phys = EEEPC_WMI_FILE "/input0";
  97         eeepc->inputdev->id.bustype = BUS_HOST;
  98         eeepc->inputdev->dev.parent = &platform_device->dev;
  99
 100         err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL);
 101         if (err)
 102                 goto err_free_dev;
 103
 104         err = input_register_device(eeepc->inputdev);
 105         if (err)
 106                 goto err_free_keymap;
 107
 108         return 0;
 109
 110 err_free_keymap:
 111         sparse_keymap_free(eeepc->inputdev);
 112 err_free_dev:
 113         input_free_device(eeepc->inputdev);
 114         return err;
 115 }
 116
 117 static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc)
 118 {
 119         if (eeepc->inputdev) {
 120                 sparse_keymap_free(eeepc->inputdev);
 121                 input_unregister_device(eeepc->inputdev);
 122         }
 123
 124         eeepc->inputdev = NULL;
 125 }
 126
 127 static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param)
 128 {
 129         struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id };
 130         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 131         union acpi_object *obj;
 132         acpi_status status;
 133         u32 tmp;
 134
 135         status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
 136                         1, EEEPC_WMI_METHODID_DSTS, &input, &output);
 137
 138         if (ACPI_FAILURE(status))
 139                 return status;
 140
 141         obj = (union acpi_object *)output.pointer;
 142         if (obj && obj->type == ACPI_TYPE_INTEGER)
 143                 tmp = (u32)obj->integer.value;
 144         else
 145                 tmp = 0;
 146
 147         if (ctrl_param)
 148                 *ctrl_param = tmp;
 149
 150         kfree(obj);
 151
 152         return status;
 153
 154 }
 155
 156 static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param)
 157 {
 158         struct bios_args args = {
 159                 .dev_id = dev_id,
 160                 .ctrl_param = ctrl_param,
 161         };
 162         struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
 163         acpi_status status;
 164
 165         status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
 166                         1, EEEPC_WMI_METHODID_DEVS, &input, NULL);
 167
 168         return status;
 169 }
 170
 171 static int read_brightness(struct backlight_device *bd)
 172 {
 173         static u32 ctrl_param;
 174         acpi_status status;
 175
 176         status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param);
 177
 178         if (ACPI_FAILURE(status))
 179                 return -1;
 180         else
 181                 return ctrl_param & 0xFF;
 182 }
 183
 184 static int update_bl_status(struct backlight_device *bd)
 185 {
 186
 187         static u32 ctrl_param;
 188         acpi_status status;
 189
 190         ctrl_param = bd->props.brightness;
 191
 192         status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param);
 193
 194         if (ACPI_FAILURE(status))
 195                 return -1;
 196         else
 197                 return 0;
 198 }
 199
 200 static const struct backlight_ops eeepc_wmi_bl_ops = {
 201         .get_brightness = read_brightness,
 202         .update_status = update_bl_status,
 203 };
 204
 205 static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code)
 206 {
 207         struct backlight_device *bd = eeepc->backlight_device;
 208         int old = bd->props.brightness;
 209         int new = old;
 210
 211         if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
 212                 new = code - NOTIFY_BRNUP_MIN + 1;
 213         else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
 214                 new = code - NOTIFY_BRNDOWN_MIN;
 215
 216         bd->props.brightness = new;
 217         backlight_update_status(bd);
 218         backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
 219
 220         return old;
 221 }
 222
 223 static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc)
 224 {
 225         struct backlight_device *bd;
 226         struct backlight_properties props;
 227
 228         memset(&props, 0, sizeof(struct backlight_properties));
 229         props.max_brightness = 15;
 230         bd = backlight_device_register(EEEPC_WMI_FILE,
 231                                        &platform_device->dev, eeepc,
 232                                        &eeepc_wmi_bl_ops, &props);
 233         if (IS_ERR(bd)) {
 234                 pr_err("Could not register backlight device\n");
 235                 return PTR_ERR(bd);
 236         }
 237
 238         eeepc->backlight_device = bd;
 239
 240         bd->props.brightness = read_brightness(bd);
 241         bd->props.power = FB_BLANK_UNBLANK;
 242         backlight_update_status(bd);
 243
 244         return 0;
 245 }
 246
 247 static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc)
 248 {
 249         if (eeepc->backlight_device)
 250                 backlight_device_unregister(eeepc->backlight_device);
 251
 252         eeepc->backlight_device = NULL;
 253 }
 254
 255 static void eeepc_wmi_notify(u32 value, void *context)
 256 {
 257         struct eeepc_wmi *eeepc = context;
 258         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 259         union acpi_object *obj;
 260         acpi_status status;
 261         int code;
 262         int orig_code;
 263
 264         status = wmi_get_event_data(value, &response);
 265         if (status != AE_OK) {
 266                 pr_err("bad event status 0x%x\n", status);
 267                 return;
 268         }
 269
 270         obj = (union acpi_object *)response.pointer;
 271
 272         if (obj && obj->type == ACPI_TYPE_INTEGER) {
 273                 code = obj->integer.value;
 274                 orig_code = code;
 275
 276                 if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
 277                         code = NOTIFY_BRNUP_MIN;
 278                 else if (code >= NOTIFY_BRNDOWN_MIN &&
 279                          code <= NOTIFY_BRNDOWN_MAX)
 280                         code = NOTIFY_BRNDOWN_MIN;
 281
 282                 if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) {
 283                         if (!acpi_video_backlight_support())
 284                                 eeepc_wmi_backlight_notify(eeepc, orig_code);
 285                 }
 286
 287                 if (!sparse_keymap_report_event(eeepc->inputdev,
 288                                                 code, 1, true))
 289                         pr_info("Unknown key %x pressed\n", code);
 290         }
 291
 292         kfree(obj);
 293 }
 294
 295 static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
 296 {
 297         struct eeepc_wmi *eeepc;
 298         int err;
 299         acpi_status status;
 300
 301         eeepc = platform_get_drvdata(device);
 302
 303         err = eeepc_wmi_input_init(eeepc);
 304         if (err)
 305                 goto error_input;
 306
 307         if (!acpi_video_backlight_support()) {
 308                 err = eeepc_wmi_backlight_init(eeepc);
 309                 if (err)
 310                         goto error_backlight;
 311         } else
 312                 pr_info("Backlight controlled by ACPI video driver\n");
 313
 314         status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
 315                                         eeepc_wmi_notify, eeepc);
 316         if (ACPI_FAILURE(status)) {
 317                 pr_err("Unable to register notify handler - %d\n",
 318                         status);
 319                 err = -ENODEV;
 320                 goto error_wmi;
 321         }
 322
 323         return 0;
 324
 325 error_wmi:
 326         eeepc_wmi_backlight_exit(eeepc);
 327 error_backlight:
 328         eeepc_wmi_input_exit(eeepc);
 329 error_input:
 330         return err;
 331 }
 332
 333 static int __devexit eeepc_wmi_platform_remove(struct platform_device *device)
 334 {
 335         struct eeepc_wmi *eeepc;
 336
 337         eeepc = platform_get_drvdata(device);
 338         wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
 339         eeepc_wmi_backlight_exit(eeepc);
 340         eeepc_wmi_input_exit(eeepc);
 341
 342         return 0;
 343 }
 344
 345 static struct platform_driver platform_driver = {
 346         .driver = {
 347                 .name = EEEPC_WMI_FILE,
 348                 .owner = THIS_MODULE,
 349         },
 350         .probe = eeepc_wmi_platform_probe,
 351         .remove = __devexit_p(eeepc_wmi_platform_remove),
 352 };
 353
 354 static int __init eeepc_wmi_init(void)
 355 {
 356         struct eeepc_wmi *eeepc;
 357         int err;
 358
 359         if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) ||
 360             !wmi_has_guid(EEEPC_WMI_MGMT_GUID)) {
 361                 pr_warning("No known WMI GUID found\n");
 362                 return -ENODEV;
 363         }
 364
 365         eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL);
 366         if (!eeepc)
 367                 return -ENOMEM;
 368
 369         platform_device = platform_device_alloc(EEEPC_WMI_FILE, -1);
 370         if (!platform_device) {
 371                 pr_warning("Unable to allocate platform device\n");
 372                 err = -ENOMEM;
 373                 goto fail_platform;
 374         }
 375
 376         err = platform_device_add(platform_device);
 377         if (err) {
 378                 pr_warning("Unable to add platform device\n");
 379                 goto put_dev;
 380         }
 381
 382         platform_set_drvdata(platform_device, eeepc);
 383
 384         err = platform_driver_register(&platform_driver);
 385         if (err) {
 386                 pr_warning("Unable to register platform driver\n");
 387                 goto del_dev;
 388         }
 389
 390         return 0;
 391
 392 del_dev:
 393         platform_device_del(platform_device);
 394 put_dev:
 395         platform_device_put(platform_device);
 396 fail_platform:
 397         kfree(eeepc);
 398
 399         return err;
 400 }
 401
 402 static void __exit eeepc_wmi_exit(void)
 403 {
 404         struct eeepc_wmi *eeepc;
 405
 406         eeepc = platform_get_drvdata(platform_device);
 407         platform_driver_unregister(&platform_driver);
 408         platform_device_unregister(platform_device);
 409         kfree(eeepc);
 410 }
 411
 412 module_init(eeepc_wmi_init);
 413 module_exit(eeepc_wmi_exit);