drivers/input/misc/wistron_btns.c

   1 /*
   2  * Wistron laptop button driver
   3  * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
   4  * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
   5  * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
   6  *
   7  * You can redistribute and/or modify this program under the terms of the
   8  * GNU General Public License version 2 as published by the Free Software
   9  * Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  14  * Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 59 Temple Place Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20 #include <asm/io.h>
  21 #include <linux/dmi.h>
  22 #include <linux/init.h>
  23 #include <linux/input.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/kernel.h>
  26 #include <linux/mc146818rtc.h>
  27 #include <linux/module.h>
  28 #include <linux/preempt.h>
  29 #include <linux/string.h>
  30 #include <linux/timer.h>
  31 #include <linux/types.h>
  32 #include <linux/platform_device.h>
  33
  34 /*
  35  * Number of attempts to read data from queue per poll;
  36  * the queue can hold up to 31 entries
  37  */
  38 #define MAX_POLL_ITERATIONS 64
  39
  40 #define POLL_FREQUENCY 10 /* Number of polls per second */
  41
  42 #if POLL_FREQUENCY > HZ
  43 #error "POLL_FREQUENCY too high"
  44 #endif
  45
  46 /* BIOS subsystem IDs */
  47 #define WIFI            0x35
  48 #define BLUETOOTH       0x34
  49
  50 MODULE_AUTHOR("Miloslav Trmac <mitr@volny.cz>");
  51 MODULE_DESCRIPTION("Wistron laptop button driver");
  52 MODULE_LICENSE("GPL v2");
  53 MODULE_VERSION("0.1");
  54
  55 static int force; /* = 0; */
  56 module_param(force, bool, 0);
  57 MODULE_PARM_DESC(force, "Load even if computer is not in database");
  58
  59 static char *keymap_name; /* = NULL; */
  60 module_param_named(keymap, keymap_name, charp, 0);
  61 MODULE_PARM_DESC(keymap, "Keymap name, if it can't be autodetected");
  62
  63 static struct platform_device *wistron_device;
  64
  65  /* BIOS interface implementation */
  66
  67 static void __iomem *bios_entry_point; /* BIOS routine entry point */
  68 static void __iomem *bios_code_map_base;
  69 static void __iomem *bios_data_map_base;
  70
  71 static u8 cmos_address;
  72
  73 struct regs {
  74         u32 eax, ebx, ecx;
  75 };
  76
  77 static void call_bios(struct regs *regs)
  78 {
  79         unsigned long flags;
  80
  81         preempt_disable();
  82         local_irq_save(flags);
  83         asm volatile ("pushl %%ebp;"
  84                       "movl %7, %%ebp;"
  85                       "call *%6;"
  86                       "popl %%ebp"
  87                       : "=a" (regs->eax), "=b" (regs->ebx), "=c" (regs->ecx)
  88                       : "0" (regs->eax), "1" (regs->ebx), "2" (regs->ecx),
  89                         "m" (bios_entry_point), "m" (bios_data_map_base)
  90                       : "edx", "edi", "esi", "memory");
  91         local_irq_restore(flags);
  92         preempt_enable();
  93 }
  94
  95 static size_t __init locate_wistron_bios(void __iomem *base)
  96 {
  97         static const unsigned char __initdata signature[] =
  98                 { 0x42, 0x21, 0x55, 0x30 };
  99         size_t offset;
 100
 101         for (offset = 0; offset < 0x10000; offset += 0x10) {
 102                 if (check_signature(base + offset, signature,
 103                                     sizeof(signature)) != 0)
 104                         return offset;
 105         }
 106         return -1;
 107 }
 108
 109 static int __init map_bios(void)
 110 {
 111         void __iomem *base;
 112         size_t offset;
 113         u32 entry_point;
 114
 115         base = ioremap(0xF0000, 0x10000); /* Can't fail */
 116         offset = locate_wistron_bios(base);
 117         if (offset < 0) {
 118                 printk(KERN_ERR "wistron_btns: BIOS entry point not found\n");
 119                 iounmap(base);
 120                 return -ENODEV;
 121         }
 122
 123         entry_point = readl(base + offset + 5);
 124         printk(KERN_DEBUG
 125                 "wistron_btns: BIOS signature found at %p, entry point %08X\n",
 126                 base + offset, entry_point);
 127
 128         if (entry_point >= 0xF0000) {
 129                 bios_code_map_base = base;
 130                 bios_entry_point = bios_code_map_base + (entry_point & 0xFFFF);
 131         } else {
 132                 iounmap(base);
 133                 bios_code_map_base = ioremap(entry_point & ~0x3FFF, 0x4000);
 134                 if (bios_code_map_base == NULL) {
 135                         printk(KERN_ERR
 136                                 "wistron_btns: Can't map BIOS code at %08X\n",
 137                                 entry_point & ~0x3FFF);
 138                         goto err;
 139                 }
 140                 bios_entry_point = bios_code_map_base + (entry_point & 0x3FFF);
 141         }
 142         /* The Windows driver maps 0x10000 bytes, we keep only one page... */
 143         bios_data_map_base = ioremap(0x400, 0xc00);
 144         if (bios_data_map_base == NULL) {
 145                 printk(KERN_ERR "wistron_btns: Can't map BIOS data\n");
 146                 goto err_code;
 147         }
 148         return 0;
 149
 150 err_code:
 151         iounmap(bios_code_map_base);
 152 err:
 153         return -ENOMEM;
 154 }
 155
 156 static inline void unmap_bios(void)
 157 {
 158         iounmap(bios_code_map_base);
 159         iounmap(bios_data_map_base);
 160 }
 161
 162  /* BIOS calls */
 163
 164 static u16 bios_pop_queue(void)
 165 {
 166         struct regs regs;
 167
 168         memset(&regs, 0, sizeof (regs));
 169         regs.eax = 0x9610;
 170         regs.ebx = 0x061C;
 171         regs.ecx = 0x0000;
 172         call_bios(&regs);
 173
 174         return regs.eax;
 175 }
 176
 177 static void __devinit bios_attach(void)
 178 {
 179         struct regs regs;
 180
 181         memset(&regs, 0, sizeof (regs));
 182         regs.eax = 0x9610;
 183         regs.ebx = 0x012E;
 184         call_bios(&regs);
 185 }
 186
 187 static void bios_detach(void)
 188 {
 189         struct regs regs;
 190
 191         memset(&regs, 0, sizeof (regs));
 192         regs.eax = 0x9610;
 193         regs.ebx = 0x002E;
 194         call_bios(&regs);
 195 }
 196
 197 static u8 __devinit bios_get_cmos_address(void)
 198 {
 199         struct regs regs;
 200
 201         memset(&regs, 0, sizeof (regs));
 202         regs.eax = 0x9610;
 203         regs.ebx = 0x051C;
 204         call_bios(&regs);
 205
 206         return regs.ecx;
 207 }
 208
 209 static u16 __devinit bios_get_default_setting(u8 subsys)
 210 {
 211         struct regs regs;
 212
 213         memset(&regs, 0, sizeof (regs));
 214         regs.eax = 0x9610;
 215         regs.ebx = 0x0200 | subsys;
 216         call_bios(&regs);
 217
 218         return regs.eax;
 219 }
 220
 221 static void bios_set_state(u8 subsys, int enable)
 222 {
 223         struct regs regs;
 224
 225         memset(&regs, 0, sizeof (regs));
 226         regs.eax = 0x9610;
 227         regs.ebx = (enable ? 0x0100 : 0x0000) | subsys;
 228         call_bios(&regs);
 229 }
 230
 231 /* Hardware database */
 232
 233 struct key_entry {
 234         char type;              /* See KE_* below */
 235         u8 code;
 236         unsigned keycode;       /* For KE_KEY */
 237 };
 238
 239 enum { KE_END, KE_KEY, KE_WIFI, KE_BLUETOOTH };
 240
 241 static const struct key_entry *keymap; /* = NULL; Current key map */
 242 static int have_wifi;
 243 static int have_bluetooth;
 244
 245 static int __init dmi_matched(struct dmi_system_id *dmi)
 246 {
 247         const struct key_entry *key;
 248
 249         keymap = dmi->driver_data;
 250         for (key = keymap; key->type != KE_END; key++) {
 251                 if (key->type == KE_WIFI) {
 252                         have_wifi = 1;
 253                         break;
 254                 } else if (key->type == KE_BLUETOOTH) {
 255                         have_bluetooth = 1;
 256                         break;
 257                 }
 258         }
 259         return 1;
 260 }
 261
 262 static struct key_entry keymap_empty[] = {
 263         { KE_END, 0 }
 264 };
 265
 266 static struct key_entry keymap_fs_amilo_pro_v2000[] = {
 267         { KE_KEY,  0x01, KEY_HELP },
 268         { KE_KEY,  0x11, KEY_PROG1 },
 269         { KE_KEY,  0x12, KEY_PROG2 },
 270         { KE_WIFI, 0x30, 0 },
 271         { KE_KEY,  0x31, KEY_MAIL },
 272         { KE_KEY,  0x36, KEY_WWW },
 273         { KE_END,  0 }
 274 };
 275
 276 static struct key_entry keymap_wistron_ms2141[] = {
 277         { KE_KEY,  0x11, KEY_PROG1 },
 278         { KE_KEY,  0x12, KEY_PROG2 },
 279         { KE_WIFI, 0x30, 0 },
 280         { KE_KEY,  0x22, KEY_REWIND },
 281         { KE_KEY,  0x23, KEY_FORWARD },
 282         { KE_KEY,  0x24, KEY_PLAYPAUSE },
 283         { KE_KEY,  0x25, KEY_STOPCD },
 284         { KE_KEY,  0x31, KEY_MAIL },
 285         { KE_KEY,  0x36, KEY_WWW },
 286         { KE_END,  0 }
 287 };
 288
 289 static struct key_entry keymap_acer_aspire_1500[] = {
 290         { KE_KEY, 0x11, KEY_PROG1 },
 291         { KE_KEY, 0x12, KEY_PROG2 },
 292         { KE_WIFI, 0x30, 0 },
 293         { KE_KEY, 0x31, KEY_MAIL },
 294         { KE_KEY, 0x36, KEY_WWW },
 295         { KE_BLUETOOTH, 0x44, 0 },
 296         { KE_END, 0 }
 297 };
 298
 299 static struct key_entry keymap_acer_travelmate_240[] = {
 300         { KE_KEY, 0x31, KEY_MAIL },
 301         { KE_KEY, 0x36, KEY_WWW },
 302         { KE_KEY, 0x11, KEY_PROG1 },
 303         { KE_KEY, 0x12, KEY_PROG2 },
 304         { KE_BLUETOOTH, 0x44, 0 },
 305         { KE_WIFI, 0x30, 0 },
 306         { KE_END, 0 }
 307 };
 308
 309 /*
 310  * If your machine is not here (which is currently rather likely), please send
 311  * a list of buttons and their key codes (reported when loading this module
 312  * with force=1) and the output of dmidecode to $MODULE_AUTHOR.
 313  */
 314 static struct dmi_system_id dmi_ids[] = {
 315         {
 316                 .callback = dmi_matched,
 317                 .ident = "Fujitsu-Siemens Amilo Pro V2000",
 318                 .matches = {
 319                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 320                         DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Pro V2000"),
 321                 },
 322                 .driver_data = keymap_fs_amilo_pro_v2000
 323         },
 324         {
 325                 .callback = dmi_matched,
 326                 .ident = "Acer Aspire 1500",
 327                 .matches = {
 328                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 329                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1500"),
 330                 },
 331                 .driver_data = keymap_acer_aspire_1500
 332         },
 333         {
 334                 .callback = dmi_matched,
 335                 .ident = "Acer TravelMate 240",
 336                 .matches = {
 337                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 338                         DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 240"),
 339                 },
 340                 .driver_data = keymap_acer_travelmate_240
 341         },
 342         { NULL, }
 343 };
 344
 345 static int __init select_keymap(void)
 346 {
 347         if (keymap_name != NULL) {
 348                 if (strcmp (keymap_name, "1557/MS2141") == 0)
 349                         keymap = keymap_wistron_ms2141;
 350                 else {
 351                         printk(KERN_ERR "wistron_btns: Keymap unknown\n");
 352                         return -EINVAL;
 353                 }
 354         }
 355         dmi_check_system(dmi_ids);
 356         if (keymap == NULL) {
 357                 if (!force) {
 358                         printk(KERN_ERR "wistron_btns: System unknown\n");
 359                         return -ENODEV;
 360                 }
 361                 keymap = keymap_empty;
 362         }
 363         return 0;
 364 }
 365
 366  /* Input layer interface */
 367
 368 static struct input_dev *input_dev;
 369
 370 static int __devinit setup_input_dev(void)
 371 {
 372         const struct key_entry *key;
 373         int error;
 374
 375         input_dev = input_allocate_device();
 376         if (!input_dev)
 377                 return -ENOMEM;
 378
 379         input_dev->name = "Wistron laptop buttons";
 380         input_dev->phys = "wistron/input0";
 381         input_dev->id.bustype = BUS_HOST;
 382         input_dev->cdev.dev = &wistron_device->dev;
 383
 384         for (key = keymap; key->type != KE_END; key++) {
 385                 if (key->type == KE_KEY) {
 386                         input_dev->evbit[LONG(EV_KEY)] = BIT(EV_KEY);
 387                         set_bit(key->keycode, input_dev->keybit);
 388                 }
 389         }
 390
 391         error = input_register_device(input_dev);
 392         if (error) {
 393                 input_free_device(input_dev);
 394                 return error;
 395         }
 396
 397         return 0;
 398 }
 399
 400 static void report_key(unsigned keycode)
 401 {
 402         input_report_key(input_dev, keycode, 1);
 403         input_sync(input_dev);
 404         input_report_key(input_dev, keycode, 0);
 405         input_sync(input_dev);
 406 }
 407
 408  /* Driver core */
 409
 410 static int wifi_enabled;
 411 static int bluetooth_enabled;
 412
 413 static void poll_bios(unsigned long);
 414
 415 static struct timer_list poll_timer = TIMER_INITIALIZER(poll_bios, 0, 0);
 416
 417 static void handle_key(u8 code)
 418 {
 419         const struct key_entry *key;
 420
 421         for (key = keymap; key->type != KE_END; key++) {
 422                 if (code == key->code) {
 423                         switch (key->type) {
 424                         case KE_KEY:
 425                                 report_key(key->keycode);
 426                                 break;
 427
 428                         case KE_WIFI:
 429                                 if (have_wifi) {
 430                                         wifi_enabled = !wifi_enabled;
 431                                         bios_set_state(WIFI, wifi_enabled);
 432                                 }
 433                                 break;
 434
 435                         case KE_BLUETOOTH:
 436                                 if (have_bluetooth) {
 437                                         bluetooth_enabled = !bluetooth_enabled;
 438                                         bios_set_state(BLUETOOTH, bluetooth_enabled);
 439                                 }
 440                                 break;
 441
 442                         case KE_END:
 443                         default:
 444                                 BUG();
 445                         }
 446                         return;
 447                 }
 448         }
 449         printk(KERN_NOTICE "wistron_btns: Unknown key code %02X\n", code);
 450 }
 451
 452 static void poll_bios(unsigned long discard)
 453 {
 454         u8 qlen;
 455         u16 val;
 456
 457         for (;;) {
 458                 qlen = CMOS_READ(cmos_address);
 459                 if (qlen == 0)
 460                         break;
 461                 val = bios_pop_queue();
 462                 if (val != 0 && !discard)
 463                         handle_key((u8)val);
 464         }
 465
 466         mod_timer(&poll_timer, jiffies + HZ / POLL_FREQUENCY);
 467 }
 468
 469 static int __devinit wistron_probe(struct platform_device *dev)
 470 {
 471         int err = setup_input_dev();
 472         if (err)
 473                 return err;
 474
 475         bios_attach();
 476         cmos_address = bios_get_cmos_address();
 477
 478         if (have_wifi) {
 479                 u16 wifi = bios_get_default_setting(WIFI);
 480                 if (wifi & 1)
 481                         wifi_enabled = (wifi & 2) ? 1 : 0;
 482                 else
 483                         have_wifi = 0;
 484
 485                 if (have_wifi)
 486                         bios_set_state(WIFI, wifi_enabled);
 487         }
 488
 489         if (have_bluetooth) {
 490                 u16 bt = bios_get_default_setting(BLUETOOTH);
 491                 if (bt & 1)
 492                         bluetooth_enabled = (bt & 2) ? 1 : 0;
 493                 else
 494                         have_bluetooth = 0;
 495
 496                 if (have_bluetooth)
 497                         bios_set_state(BLUETOOTH, bluetooth_enabled);
 498         }
 499
 500         poll_bios(1); /* Flush stale event queue and arm timer */
 501
 502         return 0;
 503 }
 504
 505 static int __devexit wistron_remove(struct platform_device *dev)
 506 {
 507         del_timer_sync(&poll_timer);
 508         input_unregister_device(input_dev);
 509         bios_detach();
 510
 511         return 0;
 512 }
 513
 514 #ifdef CONFIG_PM
 515 static int wistron_suspend(struct platform_device *dev, pm_message_t state)
 516 {
 517         del_timer_sync(&poll_timer);
 518
 519         if (have_wifi)
 520                 bios_set_state(WIFI, 0);
 521
 522         if (have_bluetooth)
 523                 bios_set_state(BLUETOOTH, 0);
 524
 525         return 0;
 526 }
 527
 528 static int wistron_resume(struct platform_device *dev)
 529 {
 530         if (have_wifi)
 531                 bios_set_state(WIFI, wifi_enabled);
 532
 533         if (have_bluetooth)
 534                 bios_set_state(BLUETOOTH, bluetooth_enabled);
 535
 536         poll_bios(1);
 537
 538         return 0;
 539 }
 540 #else
 541 #define wistron_suspend         NULL
 542 #define wistron_resume          NULL
 543 #endif
 544
 545 static struct platform_driver wistron_driver = {
 546         .driver         = {
 547                 .name   = "wistron-bios",
 548                 .owner  = THIS_MODULE,
 549         },
 550         .probe          = wistron_probe,
 551         .remove         = __devexit_p(wistron_remove),
 552         .suspend        = wistron_suspend,
 553         .resume         = wistron_resume,
 554 };
 555
 556 static int __init wb_module_init(void)
 557 {
 558         int err;
 559
 560         err = select_keymap();
 561         if (err)
 562                 return err;
 563
 564         err = map_bios();
 565         if (err)
 566                 return err;
 567
 568         err = platform_driver_register(&wistron_driver);
 569         if (err)
 570                 goto err_unmap_bios;
 571
 572         wistron_device = platform_device_alloc("wistron-bios", -1);
 573         if (!wistron_device) {
 574                 err = -ENOMEM;
 575                 goto err_unregister_driver;
 576         }
 577
 578         err = platform_device_add(wistron_device);
 579         if (err)
 580                 goto err_free_device;
 581
 582         return 0;
 583
 584  err_free_device:
 585         platform_device_put(wistron_device);
 586  err_unregister_driver:
 587         platform_driver_unregister(&wistron_driver);
 588  err_unmap_bios:
 589         unmap_bios();
 590
 591         return err;
 592 }
 593
 594 static void __exit wb_module_exit(void)
 595 {
 596         platform_device_unregister(wistron_device);
 597         platform_driver_unregister(&wistron_driver);
 598         unmap_bios();
 599 }
 600
 601 module_init(wb_module_init);
 602 module_exit(wb_module_exit);