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_KEY, 0x6b, { KEY_F13 } }, /* Disable Touchpad */
  73         { KE_KEY, 0xe1, { KEY_F14 } },
  74         { KE_KEY, 0xe9, { KEY_DISPLAY_OFF } },
  75         { KE_KEY, 0xe0, { KEY_PROG1 } },
  76         { KE_KEY, 0x5c, { KEY_F15 } },
  77         { KE_END, 0},
  78 };
  79
  80 struct bios_args {
  81         u32     dev_id;
  82         u32     ctrl_param;
  83 };
  84
  85 struct eeepc_wmi {
  86         struct input_dev *inputdev;
  87         struct backlight_device *backlight_device;
  88 };
  89
  90 static struct platform_device *platform_device;
  91
  92 static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc)
  93 {
  94         int err;
  95
  96         eeepc->inputdev = input_allocate_device();
  97         if (!eeepc->inputdev)
  98                 return -ENOMEM;
  99
 100         eeepc->inputdev->name = "Eee PC WMI hotkeys";
 101         eeepc->inputdev->phys = EEEPC_WMI_FILE "/input0";
 102         eeepc->inputdev->id.bustype = BUS_HOST;
 103         eeepc->inputdev->dev.parent = &platform_device->dev;
 104
 105         err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL);
 106         if (err)
 107                 goto err_free_dev;
 108
 109         err = input_register_device(eeepc->inputdev);
 110         if (err)
 111                 goto err_free_keymap;
 112
 113         return 0;
 114
 115 err_free_keymap:
 116         sparse_keymap_free(eeepc->inputdev);
 117 err_free_dev:
 118         input_free_device(eeepc->inputdev);
 119         return err;
 120 }
 121
 122 static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc)
 123 {
 124         if (eeepc->inputdev) {
 125                 sparse_keymap_free(eeepc->inputdev);
 126                 input_unregister_device(eeepc->inputdev);
 127         }
 128
 129         eeepc->inputdev = NULL;
 130 }
 131
 132 static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param)
 133 {
 134         struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id };
 135         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 136         union acpi_object *obj;
 137         acpi_status status;
 138         u32 tmp;
 139
 140         status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
 141                         1, EEEPC_WMI_METHODID_DSTS, &input, &output);
 142
 143         if (ACPI_FAILURE(status))
 144                 return status;
 145
 146         obj = (union acpi_object *)output.pointer;
 147         if (obj && obj->type == ACPI_TYPE_INTEGER)
 148                 tmp = (u32)obj->integer.value;
 149         else
 150                 tmp = 0;
 151
 152         if (ctrl_param)
 153                 *ctrl_param = tmp;
 154
 155         kfree(obj);
 156
 157         return status;
 158
 159 }
 160
 161 static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param)
 162 {
 163         struct bios_args args = {
 164                 .dev_id = dev_id,
 165                 .ctrl_param = ctrl_param,
 166         };
 167         struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
 168         acpi_status status;
 169
 170         status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
 171                         1, EEEPC_WMI_METHODID_DEVS, &input, NULL);
 172
 173         return status;
 174 }
 175
 176 static int read_brightness(struct backlight_device *bd)
 177 {
 178         static u32 ctrl_param;
 179         acpi_status status;
 180
 181         status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param);
 182
 183         if (ACPI_FAILURE(status))
 184                 return -1;
 185         else
 186                 return ctrl_param & 0xFF;
 187 }
 188
 189 static int update_bl_status(struct backlight_device *bd)
 190 {
 191
 192         static u32 ctrl_param;
 193         acpi_status status;
 194
 195         ctrl_param = bd->props.brightness;
 196
 197         status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param);
 198
 199         if (ACPI_FAILURE(status))
 200                 return -1;
 201         else
 202                 return 0;
 203 }
 204
 205 static const struct backlight_ops eeepc_wmi_bl_ops = {
 206         .get_brightness = read_brightness,
 207         .update_status = update_bl_status,
 208 };
 209
 210 static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code)
 211 {
 212         struct backlight_device *bd = eeepc->backlight_device;
 213         int old = bd->props.brightness;
 214         int new = old;
 215
 216         if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
 217                 new = code - NOTIFY_BRNUP_MIN + 1;
 218         else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
 219                 new = code - NOTIFY_BRNDOWN_MIN;
 220
 221         bd->props.brightness = new;
 222         backlight_update_status(bd);
 223         backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
 224
 225         return old;
 226 }
 227
 228 static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc)
 229 {
 230         struct backlight_device *bd;
 231         struct backlight_properties props;
 232
 233         memset(&props, 0, sizeof(struct backlight_properties));
 234         props.max_brightness = 15;
 235         bd = backlight_device_register(EEEPC_WMI_FILE,
 236                                        &platform_device->dev, eeepc,
 237                                        &eeepc_wmi_bl_ops, &props);
 238         if (IS_ERR(bd)) {
 239                 pr_err("Could not register backlight device\n");
 240                 return PTR_ERR(bd);
 241         }
 242
 243         eeepc->backlight_device = bd;
 244
 245         bd->props.brightness = read_brightness(bd);
 246         bd->props.power = FB_BLANK_UNBLANK;
 247         backlight_update_status(bd);
 248
 249         return 0;
 250 }
 251
 252 static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc)
 253 {
 254         if (eeepc->backlight_device)
 255                 backlight_device_unregister(eeepc->backlight_device);
 256
 257         eeepc->backlight_device = NULL;
 258 }
 259
 260 static void eeepc_wmi_notify(u32 value, void *context)
 261 {
 262         struct eeepc_wmi *eeepc = context;
 263         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 264         union acpi_object *obj;
 265         acpi_status status;
 266         int code;
 267         int orig_code;
 268
 269         status = wmi_get_event_data(value, &response);
 270         if (status != AE_OK) {
 271                 pr_err("bad event status 0x%x\n", status);
 272                 return;
 273         }
 274
 275         obj = (union acpi_object *)response.pointer;
 276
 277         if (obj && obj->type == ACPI_TYPE_INTEGER) {
 278                 code = obj->integer.value;
 279                 orig_code = code;
 280
 281                 if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
 282                         code = NOTIFY_BRNUP_MIN;
 283                 else if (code >= NOTIFY_BRNDOWN_MIN &&
 284                          code <= NOTIFY_BRNDOWN_MAX)
 285                         code = NOTIFY_BRNDOWN_MIN;
 286
 287                 if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) {
 288                         if (!acpi_video_backlight_support())
 289                                 eeepc_wmi_backlight_notify(eeepc, orig_code);
 290                 }
 291
 292                 if (!sparse_keymap_report_event(eeepc->inputdev,
 293                                                 code, 1, true))
 294                         pr_info("Unknown key %x pressed\n", code);
 295         }
 296
 297         kfree(obj);
 298 }
 299
 300 static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
 301 {
 302         struct eeepc_wmi *eeepc;
 303         int err;
 304         acpi_status status;
 305
 306         eeepc = platform_get_drvdata(device);
 307
 308         err = eeepc_wmi_input_init(eeepc);
 309         if (err)
 310                 goto error_input;
 311
 312         if (!acpi_video_backlight_support()) {
 313                 err = eeepc_wmi_backlight_init(eeepc);
 314                 if (err)
 315                         goto error_backlight;
 316         } else
 317                 pr_info("Backlight controlled by ACPI video driver\n");
 318
 319         status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
 320                                         eeepc_wmi_notify, eeepc);
 321         if (ACPI_FAILURE(status)) {
 322                 pr_err("Unable to register notify handler - %d\n",
 323                         status);
 324                 err = -ENODEV;
 325                 goto error_wmi;
 326         }
 327
 328         return 0;
 329
 330 error_wmi:
 331         eeepc_wmi_backlight_exit(eeepc);
 332 error_backlight:
 333         eeepc_wmi_input_exit(eeepc);
 334 error_input:
 335         return err;
 336 }
 337
 338 static int __devexit eeepc_wmi_platform_remove(struct platform_device *device)
 339 {
 340         struct eeepc_wmi *eeepc;
 341
 342         eeepc = platform_get_drvdata(device);
 343         wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
 344         eeepc_wmi_backlight_exit(eeepc);
 345         eeepc_wmi_input_exit(eeepc);
 346
 347         return 0;
 348 }
 349
 350 static struct platform_driver platform_driver = {
 351         .driver = {
 352                 .name = EEEPC_WMI_FILE,
 353                 .owner = THIS_MODULE,
 354         },
 355         .probe = eeepc_wmi_platform_probe,
 356         .remove = __devexit_p(eeepc_wmi_platform_remove),
 357 };
 358
 359 static int __init eeepc_wmi_init(void)
 360 {
 361         struct eeepc_wmi *eeepc;
 362         int err;
 363
 364         if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) ||
 365             !wmi_has_guid(EEEPC_WMI_MGMT_GUID)) {
 366                 pr_warning("No known WMI GUID found\n");
 367                 return -ENODEV;
 368         }
 369
 370         eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL);
 371         if (!eeepc)
 372                 return -ENOMEM;
 373
 374         platform_device = platform_device_alloc(EEEPC_WMI_FILE, -1);
 375         if (!platform_device) {
 376                 pr_warning("Unable to allocate platform device\n");
 377                 err = -ENOMEM;
 378                 goto fail_platform;
 379         }
 380
 381         err = platform_device_add(platform_device);
 382         if (err) {
 383                 pr_warning("Unable to add platform device\n");
 384                 goto put_dev;
 385         }
 386
 387         platform_set_drvdata(platform_device, eeepc);
 388
 389         err = platform_driver_register(&platform_driver);
 390         if (err) {
 391                 pr_warning("Unable to register platform driver\n");
 392                 goto del_dev;
 393         }
 394
 395         return 0;
 396
 397 del_dev:
 398         platform_device_del(platform_device);
 399 put_dev:
 400         platform_device_put(platform_device);
 401 fail_platform:
 402         kfree(eeepc);
 403
 404         return err;
 405 }
 406
 407 static void __exit eeepc_wmi_exit(void)
 408 {
 409         struct eeepc_wmi *eeepc;
 410
 411         eeepc = platform_get_drvdata(platform_device);
 412         platform_driver_unregister(&platform_driver);
 413         platform_device_unregister(platform_device);
 414         kfree(eeepc);
 415 }
 416
 417 module_init(eeepc_wmi_init);
 418 module_exit(eeepc_wmi_exit);