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 #define EEEPC_WMI_METHODID_CFVS 0x53564643
  61
  62 #define EEEPC_WMI_DEVID_BACKLIGHT       0x00050012
  63
  64 static const struct key_entry eeepc_wmi_keymap[] = {
  65         /* Sleep already handled via generic ACPI code */
  66         { KE_KEY, 0x5d, { KEY_WLAN } },
  67         { KE_KEY, 0x32, { KEY_MUTE } },
  68         { KE_KEY, 0x31, { KEY_VOLUMEDOWN } },
  69         { KE_KEY, 0x30, { KEY_VOLUMEUP } },
  70         { KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } },
  71         { KE_IGNORE, NOTIFY_BRNUP_MIN, { KEY_BRIGHTNESSUP } },
  72         { KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } },
  73         { KE_KEY, 0x6b, { KEY_F13 } }, /* Disable Touchpad */
  74         { KE_KEY, 0xe1, { KEY_F14 } },
  75         { KE_KEY, 0xe9, { KEY_DISPLAY_OFF } },
  76         { KE_KEY, 0xe0, { KEY_PROG1 } },
  77         { KE_KEY, 0x5c, { KEY_F15 } },
  78         { KE_END, 0},
  79 };
  80
  81 struct bios_args {
  82         u32     dev_id;
  83         u32     ctrl_param;
  84 };
  85
  86 struct eeepc_wmi {
  87         struct input_dev *inputdev;
  88         struct backlight_device *backlight_device;
  89 };
  90
  91 static struct platform_device *platform_device;
  92
  93 static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc)
  94 {
  95         int err;
  96
  97         eeepc->inputdev = input_allocate_device();
  98         if (!eeepc->inputdev)
  99                 return -ENOMEM;
 100
 101         eeepc->inputdev->name = "Eee PC WMI hotkeys";
 102         eeepc->inputdev->phys = EEEPC_WMI_FILE "/input0";
 103         eeepc->inputdev->id.bustype = BUS_HOST;
 104         eeepc->inputdev->dev.parent = &platform_device->dev;
 105
 106         err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL);
 107         if (err)
 108                 goto err_free_dev;
 109
 110         err = input_register_device(eeepc->inputdev);
 111         if (err)
 112                 goto err_free_keymap;
 113
 114         return 0;
 115
 116 err_free_keymap:
 117         sparse_keymap_free(eeepc->inputdev);
 118 err_free_dev:
 119         input_free_device(eeepc->inputdev);
 120         return err;
 121 }
 122
 123 static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc)
 124 {
 125         if (eeepc->inputdev) {
 126                 sparse_keymap_free(eeepc->inputdev);
 127                 input_unregister_device(eeepc->inputdev);
 128         }
 129
 130         eeepc->inputdev = NULL;
 131 }
 132
 133 static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param)
 134 {
 135         struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id };
 136         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 137         union acpi_object *obj;
 138         acpi_status status;
 139         u32 tmp;
 140
 141         status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
 142                         1, EEEPC_WMI_METHODID_DSTS, &input, &output);
 143
 144         if (ACPI_FAILURE(status))
 145                 return status;
 146
 147         obj = (union acpi_object *)output.pointer;
 148         if (obj && obj->type == ACPI_TYPE_INTEGER)
 149                 tmp = (u32)obj->integer.value;
 150         else
 151                 tmp = 0;
 152
 153         if (ctrl_param)
 154                 *ctrl_param = tmp;
 155
 156         kfree(obj);
 157
 158         return status;
 159
 160 }
 161
 162 static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param)
 163 {
 164         struct bios_args args = {
 165                 .dev_id = dev_id,
 166                 .ctrl_param = ctrl_param,
 167         };
 168         struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
 169         acpi_status status;
 170
 171         status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
 172                         1, EEEPC_WMI_METHODID_DEVS, &input, NULL);
 173
 174         return status;
 175 }
 176
 177 static int read_brightness(struct backlight_device *bd)
 178 {
 179         static u32 ctrl_param;
 180         acpi_status status;
 181
 182         status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param);
 183
 184         if (ACPI_FAILURE(status))
 185                 return -1;
 186         else
 187                 return ctrl_param & 0xFF;
 188 }
 189
 190 static int update_bl_status(struct backlight_device *bd)
 191 {
 192
 193         static u32 ctrl_param;
 194         acpi_status status;
 195
 196         ctrl_param = bd->props.brightness;
 197
 198         status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param);
 199
 200         if (ACPI_FAILURE(status))
 201                 return -1;
 202         else
 203                 return 0;
 204 }
 205
 206 static const struct backlight_ops eeepc_wmi_bl_ops = {
 207         .get_brightness = read_brightness,
 208         .update_status = update_bl_status,
 209 };
 210
 211 static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code)
 212 {
 213         struct backlight_device *bd = eeepc->backlight_device;
 214         int old = bd->props.brightness;
 215         int new = old;
 216
 217         if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
 218                 new = code - NOTIFY_BRNUP_MIN + 1;
 219         else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
 220                 new = code - NOTIFY_BRNDOWN_MIN;
 221
 222         bd->props.brightness = new;
 223         backlight_update_status(bd);
 224         backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
 225
 226         return old;
 227 }
 228
 229 static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc)
 230 {
 231         struct backlight_device *bd;
 232         struct backlight_properties props;
 233
 234         memset(&props, 0, sizeof(struct backlight_properties));
 235         props.max_brightness = 15;
 236         bd = backlight_device_register(EEEPC_WMI_FILE,
 237                                        &platform_device->dev, eeepc,
 238                                        &eeepc_wmi_bl_ops, &props);
 239         if (IS_ERR(bd)) {
 240                 pr_err("Could not register backlight device\n");
 241                 return PTR_ERR(bd);
 242         }
 243
 244         eeepc->backlight_device = bd;
 245
 246         bd->props.brightness = read_brightness(bd);
 247         bd->props.power = FB_BLANK_UNBLANK;
 248         backlight_update_status(bd);
 249
 250         return 0;
 251 }
 252
 253 static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc)
 254 {
 255         if (eeepc->backlight_device)
 256                 backlight_device_unregister(eeepc->backlight_device);
 257
 258         eeepc->backlight_device = NULL;
 259 }
 260
 261 static void eeepc_wmi_notify(u32 value, void *context)
 262 {
 263         struct eeepc_wmi *eeepc = context;
 264         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 265         union acpi_object *obj;
 266         acpi_status status;
 267         int code;
 268         int orig_code;
 269
 270         status = wmi_get_event_data(value, &response);
 271         if (status != AE_OK) {
 272                 pr_err("bad event status 0x%x\n", status);
 273                 return;
 274         }
 275
 276         obj = (union acpi_object *)response.pointer;
 277
 278         if (obj && obj->type == ACPI_TYPE_INTEGER) {
 279                 code = obj->integer.value;
 280                 orig_code = code;
 281
 282                 if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
 283                         code = NOTIFY_BRNUP_MIN;
 284                 else if (code >= NOTIFY_BRNDOWN_MIN &&
 285                          code <= NOTIFY_BRNDOWN_MAX)
 286                         code = NOTIFY_BRNDOWN_MIN;
 287
 288                 if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) {
 289                         if (!acpi_video_backlight_support())
 290                                 eeepc_wmi_backlight_notify(eeepc, orig_code);
 291                 }
 292
 293                 if (!sparse_keymap_report_event(eeepc->inputdev,
 294                                                 code, 1, true))
 295                         pr_info("Unknown key %x pressed\n", code);
 296         }
 297
 298         kfree(obj);
 299 }
 300
 301 static int store_cpufv(struct device *dev, struct device_attribute *attr,
 302                        const char *buf, size_t count)
 303 {
 304         int value;
 305         struct acpi_buffer input = { (acpi_size)sizeof(value), &value };
 306         acpi_status status;
 307
 308         if (!count || sscanf(buf, "%i", &value) != 1)
 309                 return -EINVAL;
 310         if (value < 0 || value > 2)
 311                 return -EINVAL;
 312
 313         status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
 314                                      1, EEEPC_WMI_METHODID_CFVS, &input, NULL);
 315
 316         if (ACPI_FAILURE(status))
 317                 return -EIO;
 318         else
 319                 return count;
 320 }
 321
 322 static DEVICE_ATTR(cpufv, S_IRUGO | S_IWUSR, NULL, store_cpufv);
 323
 324 static void eeepc_wmi_sysfs_exit(struct platform_device *device)
 325 {
 326         device_remove_file(&device->dev, &dev_attr_cpufv);
 327 }
 328
 329 static int eeepc_wmi_sysfs_init(struct platform_device *device)
 330 {
 331         int retval = -ENOMEM;
 332
 333         retval = device_create_file(&device->dev, &dev_attr_cpufv);
 334         if (retval)
 335                 goto error_sysfs;
 336
 337         return 0;
 338
 339 error_sysfs:
 340         eeepc_wmi_sysfs_exit(platform_device);
 341         return retval;
 342 }
 343
 344 static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
 345 {
 346         struct eeepc_wmi *eeepc;
 347         int err;
 348         acpi_status status;
 349
 350         eeepc = platform_get_drvdata(device);
 351
 352         err = eeepc_wmi_input_init(eeepc);
 353         if (err)
 354                 goto error_input;
 355
 356         if (!acpi_video_backlight_support()) {
 357                 err = eeepc_wmi_backlight_init(eeepc);
 358                 if (err)
 359                         goto error_backlight;
 360         } else
 361                 pr_info("Backlight controlled by ACPI video driver\n");
 362
 363         status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
 364                                         eeepc_wmi_notify, eeepc);
 365         if (ACPI_FAILURE(status)) {
 366                 pr_err("Unable to register notify handler - %d\n",
 367                         status);
 368                 err = -ENODEV;
 369                 goto error_wmi;
 370         }
 371
 372         return 0;
 373
 374 error_wmi:
 375         eeepc_wmi_backlight_exit(eeepc);
 376 error_backlight:
 377         eeepc_wmi_input_exit(eeepc);
 378 error_input:
 379         return err;
 380 }
 381
 382 static int __devexit eeepc_wmi_platform_remove(struct platform_device *device)
 383 {
 384         struct eeepc_wmi *eeepc;
 385
 386         eeepc = platform_get_drvdata(device);
 387         wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
 388         eeepc_wmi_backlight_exit(eeepc);
 389         eeepc_wmi_input_exit(eeepc);
 390
 391         return 0;
 392 }
 393
 394 static struct platform_driver platform_driver = {
 395         .driver = {
 396                 .name = EEEPC_WMI_FILE,
 397                 .owner = THIS_MODULE,
 398         },
 399         .probe = eeepc_wmi_platform_probe,
 400         .remove = __devexit_p(eeepc_wmi_platform_remove),
 401 };
 402
 403 static int __init eeepc_wmi_init(void)
 404 {
 405         struct eeepc_wmi *eeepc;
 406         int err;
 407
 408         if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) ||
 409             !wmi_has_guid(EEEPC_WMI_MGMT_GUID)) {
 410                 pr_warning("No known WMI GUID found\n");
 411                 return -ENODEV;
 412         }
 413
 414         eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL);
 415         if (!eeepc)
 416                 return -ENOMEM;
 417
 418         platform_device = platform_device_alloc(EEEPC_WMI_FILE, -1);
 419         if (!platform_device) {
 420                 pr_warning("Unable to allocate platform device\n");
 421                 err = -ENOMEM;
 422                 goto fail_platform;
 423         }
 424
 425         err = platform_device_add(platform_device);
 426         if (err) {
 427                 pr_warning("Unable to add platform device\n");
 428                 goto put_dev;
 429         }
 430
 431         platform_set_drvdata(platform_device, eeepc);
 432
 433         err = platform_driver_register(&platform_driver);
 434         if (err) {
 435                 pr_warning("Unable to register platform driver\n");
 436                 goto del_dev;
 437         }
 438
 439         err = eeepc_wmi_sysfs_init(platform_device);
 440         if (err)
 441                 goto del_sysfs;
 442
 443         return 0;
 444
 445 del_sysfs:
 446         eeepc_wmi_sysfs_exit(platform_device);
 447 del_dev:
 448         platform_device_del(platform_device);
 449 put_dev:
 450         platform_device_put(platform_device);
 451 fail_platform:
 452         kfree(eeepc);
 453
 454         return err;
 455 }
 456
 457 static void __exit eeepc_wmi_exit(void)
 458 {
 459         struct eeepc_wmi *eeepc;
 460
 461         eeepc_wmi_sysfs_exit(platform_device);
 462         eeepc = platform_get_drvdata(platform_device);
 463         platform_driver_unregister(&platform_driver);
 464         platform_device_unregister(platform_device);
 465         kfree(eeepc);
 466 }
 467
 468 module_init(eeepc_wmi_init);
 469 module_exit(eeepc_wmi_exit);