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(®s, 0, sizeof (regs)); 169 regs.eax = 0x9610; 170 regs.ebx = 0x061C; 171 regs.ecx = 0x0000; 172 call_bios(®s); 173 174 return regs.eax; 175 } 176 177 static void __init bios_attach(void) 178 { 179 struct regs regs; 180 181 memset(®s, 0, sizeof (regs)); 182 regs.eax = 0x9610; 183 regs.ebx = 0x012E; 184 call_bios(®s); 185 } 186 187 static void bios_detach(void) 188 { 189 struct regs regs; 190 191 memset(®s, 0, sizeof (regs)); 192 regs.eax = 0x9610; 193 regs.ebx = 0x002E; 194 call_bios(®s); 195 } 196 197 static u8 __init bios_get_cmos_address(void) 198 { 199 struct regs regs; 200 201 memset(®s, 0, sizeof (regs)); 202 regs.eax = 0x9610; 203 regs.ebx = 0x051C; 204 call_bios(®s); 205 206 return regs.ecx; 207 } 208 209 static u16 __init bios_get_default_setting(u8 subsys) 210 { 211 struct regs regs; 212 213 memset(®s, 0, sizeof (regs)); 214 regs.eax = 0x9610; 215 regs.ebx = 0x0200 | subsys; 216 call_bios(®s); 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(®s, 0, sizeof (regs)); 226 regs.eax = 0x9610; 227 regs.ebx = (enable ? 0x0100 : 0x0000) | subsys; 228 call_bios(®s); 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 /* 300 * If your machine is not here (which is currently rather likely), please send 301 * a list of buttons and their key codes (reported when loading this module 302 * with force=1) and the output of dmidecode to $MODULE_AUTHOR. 303 */ 304 static struct dmi_system_id dmi_ids[] = { 305 { 306 .callback = dmi_matched, 307 .ident = "Fujitsu-Siemens Amilo Pro V2000", 308 .matches = { 309 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 310 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Pro V2000"), 311 }, 312 .driver_data = keymap_fs_amilo_pro_v2000 313 }, 314 { 315 .callback = dmi_matched, 316 .ident = "Acer Aspire 1500", 317 .matches = { 318 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 319 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1500"), 320 }, 321 .driver_data = keymap_acer_aspire_1500 322 }, 323 { NULL, } 324 }; 325 326 static int __init select_keymap(void) 327 { 328 if (keymap_name != NULL) { 329 if (strcmp (keymap_name, "1557/MS2141") == 0) 330 keymap = keymap_wistron_ms2141; 331 else { 332 printk(KERN_ERR "wistron_btns: Keymap unknown\n"); 333 return -EINVAL; 334 } 335 } 336 dmi_check_system(dmi_ids); 337 if (keymap == NULL) { 338 if (!force) { 339 printk(KERN_ERR "wistron_btns: System unknown\n"); 340 return -ENODEV; 341 } 342 keymap = keymap_empty; 343 } 344 return 0; 345 } 346 347 /* Input layer interface */ 348 349 static struct input_dev *input_dev; 350 351 static int __init setup_input_dev(void) 352 { 353 const struct key_entry *key; 354 int error; 355 356 input_dev = input_allocate_device(); 357 if (!input_dev) 358 return -ENOMEM; 359 360 input_dev->name = "Wistron laptop buttons"; 361 input_dev->phys = "wistron/input0"; 362 input_dev->id.bustype = BUS_HOST; 363 input_dev->cdev.dev = &wistron_device->dev; 364 365 for (key = keymap; key->type != KE_END; key++) { 366 if (key->type == KE_KEY) { 367 input_dev->evbit[LONG(EV_KEY)] = BIT(EV_KEY); 368 set_bit(key->keycode, input_dev->keybit); 369 } 370 } 371 372 error = input_register_device(input_dev); 373 if (error) { 374 input_free_device(input_dev); 375 return error; 376 } 377 378 return 0; 379 } 380 381 static void report_key(unsigned keycode) 382 { 383 input_report_key(input_dev, keycode, 1); 384 input_sync(input_dev); 385 input_report_key(input_dev, keycode, 0); 386 input_sync(input_dev); 387 } 388 389 /* Driver core */ 390 391 static int wifi_enabled; 392 static int bluetooth_enabled; 393 394 static void poll_bios(unsigned long); 395 396 static struct timer_list poll_timer = TIMER_INITIALIZER(poll_bios, 0, 0); 397 398 static void handle_key(u8 code) 399 { 400 const struct key_entry *key; 401 402 for (key = keymap; key->type != KE_END; key++) { 403 if (code == key->code) { 404 switch (key->type) { 405 case KE_KEY: 406 report_key(key->keycode); 407 break; 408 409 case KE_WIFI: 410 if (have_wifi) { 411 wifi_enabled = !wifi_enabled; 412 bios_set_state(WIFI, wifi_enabled); 413 } 414 break; 415 416 case KE_BLUETOOTH: 417 if (have_bluetooth) { 418 bluetooth_enabled = !bluetooth_enabled; 419 bios_set_state(BLUETOOTH, bluetooth_enabled); 420 } 421 break; 422 423 case KE_END: 424 default: 425 BUG(); 426 } 427 return; 428 } 429 } 430 printk(KERN_NOTICE "wistron_btns: Unknown key code %02X\n", code); 431 } 432 433 static void poll_bios(unsigned long discard) 434 { 435 u8 qlen; 436 u16 val; 437 438 for (;;) { 439 qlen = CMOS_READ(cmos_address); 440 if (qlen == 0) 441 break; 442 val = bios_pop_queue(); 443 if (val != 0 && !discard) 444 handle_key((u8)val); 445 } 446 447 mod_timer(&poll_timer, jiffies + HZ / POLL_FREQUENCY); 448 } 449 450 static int wistron_suspend(struct platform_device *dev, pm_message_t state) 451 { 452 del_timer_sync(&poll_timer); 453 454 if (have_wifi) 455 bios_set_state(WIFI, 0); 456 457 if (have_bluetooth) 458 bios_set_state(BLUETOOTH, 0); 459 460 return 0; 461 } 462 463 static int wistron_resume(struct platform_device *dev) 464 { 465 if (have_wifi) 466 bios_set_state(WIFI, wifi_enabled); 467 468 if (have_bluetooth) 469 bios_set_state(BLUETOOTH, bluetooth_enabled); 470 471 poll_bios(1); 472 473 return 0; 474 } 475 476 static struct platform_driver wistron_driver = { 477 .suspend = wistron_suspend, 478 .resume = wistron_resume, 479 .driver = { 480 .name = "wistron-bios", 481 }, 482 }; 483 484 static int __init wb_module_init(void) 485 { 486 int err; 487 488 err = select_keymap(); 489 if (err) 490 return err; 491 492 err = map_bios(); 493 if (err) 494 return err; 495 496 bios_attach(); 497 cmos_address = bios_get_cmos_address(); 498 499 err = platform_driver_register(&wistron_driver); 500 if (err) 501 goto err_detach_bios; 502 503 wistron_device = platform_device_register_simple("wistron-bios", -1, NULL, 0); 504 if (IS_ERR(wistron_device)) { 505 err = PTR_ERR(wistron_device); 506 goto err_unregister_driver; 507 } 508 509 if (have_wifi) { 510 u16 wifi = bios_get_default_setting(WIFI); 511 if (wifi & 1) 512 wifi_enabled = (wifi & 2) ? 1 : 0; 513 else 514 have_wifi = 0; 515 516 if (have_wifi) 517 bios_set_state(WIFI, wifi_enabled); 518 } 519 520 if (have_bluetooth) { 521 u16 bt = bios_get_default_setting(BLUETOOTH); 522 if (bt & 1) 523 bluetooth_enabled = (bt & 2) ? 1 : 0; 524 else 525 have_bluetooth = 0; 526 527 if (have_bluetooth) 528 bios_set_state(BLUETOOTH, bluetooth_enabled); 529 } 530 531 err = setup_input_dev(); 532 if (err) 533 goto err_unregister_device; 534 535 poll_bios(1); /* Flush stale event queue and arm timer */ 536 537 return 0; 538 539 err_unregister_device: 540 platform_device_unregister(wistron_device); 541 err_unregister_driver: 542 platform_driver_unregister(&wistron_driver); 543 err_detach_bios: 544 bios_detach(); 545 unmap_bios(); 546 547 return err; 548 } 549 550 static void __exit wb_module_exit(void) 551 { 552 del_timer_sync(&poll_timer); 553 input_unregister_device(input_dev); 554 platform_device_unregister(wistron_device); 555 platform_driver_unregister(&wistron_driver); 556 bios_detach(); 557 unmap_bios(); 558 } 559 560 module_init(wb_module_init); 561 module_exit(wb_module_exit); 562