1 /* 2 * Samsung Laptop driver 3 * 4 * Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de) 5 * Copyright (C) 2009,2011 Novell Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 as published by 9 * the Free Software Foundation. 10 * 11 */ 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #include <linux/kernel.h> 15 #include <linux/init.h> 16 #include <linux/module.h> 17 #include <linux/delay.h> 18 #include <linux/pci.h> 19 #include <linux/backlight.h> 20 #include <linux/fb.h> 21 #include <linux/dmi.h> 22 #include <linux/platform_device.h> 23 #include <linux/rfkill.h> 24 25 /* 26 * This driver is needed because a number of Samsung laptops do not hook 27 * their control settings through ACPI. So we have to poke around in the 28 * BIOS to do things like brightness values, and "special" key controls. 29 */ 30 31 /* 32 * We have 0 - 8 as valid brightness levels. The specs say that level 0 should 33 * be reserved by the BIOS (which really doesn't make much sense), we tell 34 * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8 35 */ 36 #define MAX_BRIGHT 0x07 37 38 39 #define SABI_IFACE_MAIN 0x00 40 #define SABI_IFACE_SUB 0x02 41 #define SABI_IFACE_COMPLETE 0x04 42 #define SABI_IFACE_DATA 0x05 43 44 /* Structure to get data back to the calling function */ 45 struct sabi_retval { 46 u8 retval[20]; 47 }; 48 49 struct sabi_header_offsets { 50 u8 port; 51 u8 re_mem; 52 u8 iface_func; 53 u8 en_mem; 54 u8 data_offset; 55 u8 data_segment; 56 }; 57 58 struct sabi_commands { 59 /* 60 * Brightness is 0 - 8, as described above. 61 * Value 0 is for the BIOS to use 62 */ 63 u8 get_brightness; 64 u8 set_brightness; 65 66 /* 67 * first byte: 68 * 0x00 - wireless is off 69 * 0x01 - wireless is on 70 * second byte: 71 * 0x02 - 3G is off 72 * 0x03 - 3G is on 73 * TODO, verify 3G is correct, that doesn't seem right... 74 */ 75 u8 get_wireless_button; 76 u8 set_wireless_button; 77 78 /* 0 is off, 1 is on */ 79 u8 get_backlight; 80 u8 set_backlight; 81 82 /* 83 * 0x80 or 0x00 - no action 84 * 0x81 - recovery key pressed 85 */ 86 u8 get_recovery_mode; 87 u8 set_recovery_mode; 88 89 /* 90 * on seclinux: 0 is low, 1 is high, 91 * on swsmi: 0 is normal, 1 is silent, 2 is turbo 92 */ 93 u8 get_performance_level; 94 u8 set_performance_level; 95 96 /* 97 * Tell the BIOS that Linux is running on this machine. 98 * 81 is on, 80 is off 99 */ 100 u8 set_linux; 101 }; 102 103 struct sabi_performance_level { 104 const char *name; 105 u8 value; 106 }; 107 108 struct sabi_config { 109 const char *test_string; 110 u16 main_function; 111 const struct sabi_header_offsets header_offsets; 112 const struct sabi_commands commands; 113 const struct sabi_performance_level performance_levels[4]; 114 u8 min_brightness; 115 u8 max_brightness; 116 }; 117 118 static const struct sabi_config sabi_configs[] = { 119 { 120 .test_string = "SECLINUX", 121 122 .main_function = 0x4c49, 123 124 .header_offsets = { 125 .port = 0x00, 126 .re_mem = 0x02, 127 .iface_func = 0x03, 128 .en_mem = 0x04, 129 .data_offset = 0x05, 130 .data_segment = 0x07, 131 }, 132 133 .commands = { 134 .get_brightness = 0x00, 135 .set_brightness = 0x01, 136 137 .get_wireless_button = 0x02, 138 .set_wireless_button = 0x03, 139 140 .get_backlight = 0x04, 141 .set_backlight = 0x05, 142 143 .get_recovery_mode = 0x06, 144 .set_recovery_mode = 0x07, 145 146 .get_performance_level = 0x08, 147 .set_performance_level = 0x09, 148 149 .set_linux = 0x0a, 150 }, 151 152 .performance_levels = { 153 { 154 .name = "silent", 155 .value = 0, 156 }, 157 { 158 .name = "normal", 159 .value = 1, 160 }, 161 { }, 162 }, 163 .min_brightness = 1, 164 .max_brightness = 8, 165 }, 166 { 167 .test_string = "SwSmi@", 168 169 .main_function = 0x5843, 170 171 .header_offsets = { 172 .port = 0x00, 173 .re_mem = 0x04, 174 .iface_func = 0x02, 175 .en_mem = 0x03, 176 .data_offset = 0x05, 177 .data_segment = 0x07, 178 }, 179 180 .commands = { 181 .get_brightness = 0x10, 182 .set_brightness = 0x11, 183 184 .get_wireless_button = 0x12, 185 .set_wireless_button = 0x13, 186 187 .get_backlight = 0x2d, 188 .set_backlight = 0x2e, 189 190 .get_recovery_mode = 0xff, 191 .set_recovery_mode = 0xff, 192 193 .get_performance_level = 0x31, 194 .set_performance_level = 0x32, 195 196 .set_linux = 0xff, 197 }, 198 199 .performance_levels = { 200 { 201 .name = "normal", 202 .value = 0, 203 }, 204 { 205 .name = "silent", 206 .value = 1, 207 }, 208 { 209 .name = "overclock", 210 .value = 2, 211 }, 212 { }, 213 }, 214 .min_brightness = 0, 215 .max_brightness = 8, 216 }, 217 { }, 218 }; 219 220 static const struct sabi_config *sabi_config; 221 222 static void __iomem *sabi; 223 static void __iomem *sabi_iface; 224 static void __iomem *f0000_segment; 225 static struct backlight_device *backlight_device; 226 static struct mutex sabi_mutex; 227 static struct platform_device *sdev; 228 static struct rfkill *rfk; 229 230 static int force; 231 module_param(force, bool, 0); 232 MODULE_PARM_DESC(force, 233 "Disable the DMI check and forces the driver to be loaded"); 234 235 static int debug; 236 module_param(debug, bool, S_IRUGO | S_IWUSR); 237 MODULE_PARM_DESC(debug, "Debug enabled or not"); 238 239 static int sabi_get_command(u8 command, struct sabi_retval *sretval) 240 { 241 int retval = 0; 242 u16 port = readw(sabi + sabi_config->header_offsets.port); 243 u8 complete, iface_data; 244 245 mutex_lock(&sabi_mutex); 246 247 /* enable memory to be able to write to it */ 248 outb(readb(sabi + sabi_config->header_offsets.en_mem), port); 249 250 /* write out the command */ 251 writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN); 252 writew(command, sabi_iface + SABI_IFACE_SUB); 253 writeb(0, sabi_iface + SABI_IFACE_COMPLETE); 254 outb(readb(sabi + sabi_config->header_offsets.iface_func), port); 255 256 /* write protect memory to make it safe */ 257 outb(readb(sabi + sabi_config->header_offsets.re_mem), port); 258 259 /* see if the command actually succeeded */ 260 complete = readb(sabi_iface + SABI_IFACE_COMPLETE); 261 iface_data = readb(sabi_iface + SABI_IFACE_DATA); 262 if (complete != 0xaa || iface_data == 0xff) { 263 pr_warn("SABI get command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n", 264 command, complete, iface_data); 265 retval = -EINVAL; 266 goto exit; 267 } 268 /* 269 * Save off the data into a structure so the caller use it. 270 * Right now we only want the first 4 bytes, 271 * There are commands that need more, but not for the ones we 272 * currently care about. 273 */ 274 sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA); 275 sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1); 276 sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2); 277 sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3); 278 279 exit: 280 mutex_unlock(&sabi_mutex); 281 return retval; 282 283 } 284 285 static int sabi_set_command(u8 command, u8 data) 286 { 287 int retval = 0; 288 u16 port = readw(sabi + sabi_config->header_offsets.port); 289 u8 complete, iface_data; 290 291 mutex_lock(&sabi_mutex); 292 293 /* enable memory to be able to write to it */ 294 outb(readb(sabi + sabi_config->header_offsets.en_mem), port); 295 296 /* write out the command */ 297 writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN); 298 writew(command, sabi_iface + SABI_IFACE_SUB); 299 writeb(0, sabi_iface + SABI_IFACE_COMPLETE); 300 writeb(data, sabi_iface + SABI_IFACE_DATA); 301 outb(readb(sabi + sabi_config->header_offsets.iface_func), port); 302 303 /* write protect memory to make it safe */ 304 outb(readb(sabi + sabi_config->header_offsets.re_mem), port); 305 306 /* see if the command actually succeeded */ 307 complete = readb(sabi_iface + SABI_IFACE_COMPLETE); 308 iface_data = readb(sabi_iface + SABI_IFACE_DATA); 309 if (complete != 0xaa || iface_data == 0xff) { 310 pr_warn("SABI set command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n", 311 command, complete, iface_data); 312 retval = -EINVAL; 313 } 314 315 mutex_unlock(&sabi_mutex); 316 return retval; 317 } 318 319 static void test_backlight(void) 320 { 321 struct sabi_retval sretval; 322 323 sabi_get_command(sabi_config->commands.get_backlight, &sretval); 324 printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); 325 326 sabi_set_command(sabi_config->commands.set_backlight, 0); 327 printk(KERN_DEBUG "backlight should be off\n"); 328 329 sabi_get_command(sabi_config->commands.get_backlight, &sretval); 330 printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); 331 332 msleep(1000); 333 334 sabi_set_command(sabi_config->commands.set_backlight, 1); 335 printk(KERN_DEBUG "backlight should be on\n"); 336 337 sabi_get_command(sabi_config->commands.get_backlight, &sretval); 338 printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); 339 } 340 341 static void test_wireless(void) 342 { 343 struct sabi_retval sretval; 344 345 sabi_get_command(sabi_config->commands.get_wireless_button, &sretval); 346 printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); 347 348 sabi_set_command(sabi_config->commands.set_wireless_button, 0); 349 printk(KERN_DEBUG "wireless led should be off\n"); 350 351 sabi_get_command(sabi_config->commands.get_wireless_button, &sretval); 352 printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); 353 354 msleep(1000); 355 356 sabi_set_command(sabi_config->commands.set_wireless_button, 1); 357 printk(KERN_DEBUG "wireless led should be on\n"); 358 359 sabi_get_command(sabi_config->commands.get_wireless_button, &sretval); 360 printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); 361 } 362 363 static u8 read_brightness(void) 364 { 365 struct sabi_retval sretval; 366 int user_brightness = 0; 367 int retval; 368 369 retval = sabi_get_command(sabi_config->commands.get_brightness, 370 &sretval); 371 if (!retval) { 372 user_brightness = sretval.retval[0]; 373 if (user_brightness != 0) 374 user_brightness -= sabi_config->min_brightness; 375 } 376 return user_brightness; 377 } 378 379 static void set_brightness(u8 user_brightness) 380 { 381 u8 user_level = user_brightness - sabi_config->min_brightness; 382 383 sabi_set_command(sabi_config->commands.set_brightness, user_level); 384 } 385 386 static int get_brightness(struct backlight_device *bd) 387 { 388 return (int)read_brightness(); 389 } 390 391 static int update_status(struct backlight_device *bd) 392 { 393 set_brightness(bd->props.brightness); 394 395 if (bd->props.power == FB_BLANK_UNBLANK) 396 sabi_set_command(sabi_config->commands.set_backlight, 1); 397 else 398 sabi_set_command(sabi_config->commands.set_backlight, 0); 399 return 0; 400 } 401 402 static const struct backlight_ops backlight_ops = { 403 .get_brightness = get_brightness, 404 .update_status = update_status, 405 }; 406 407 static int rfkill_set(void *data, bool blocked) 408 { 409 /* Do something with blocked...*/ 410 /* 411 * blocked == false is on 412 * blocked == true is off 413 */ 414 if (blocked) 415 sabi_set_command(sabi_config->commands.set_wireless_button, 0); 416 else 417 sabi_set_command(sabi_config->commands.set_wireless_button, 1); 418 419 return 0; 420 } 421 422 static struct rfkill_ops rfkill_ops = { 423 .set_block = rfkill_set, 424 }; 425 426 static int init_wireless(struct platform_device *sdev) 427 { 428 int retval; 429 430 rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN, 431 &rfkill_ops, NULL); 432 if (!rfk) 433 return -ENOMEM; 434 435 retval = rfkill_register(rfk); 436 if (retval) { 437 rfkill_destroy(rfk); 438 return -ENODEV; 439 } 440 441 return 0; 442 } 443 444 static void destroy_wireless(void) 445 { 446 rfkill_unregister(rfk); 447 rfkill_destroy(rfk); 448 } 449 450 static ssize_t get_performance_level(struct device *dev, 451 struct device_attribute *attr, char *buf) 452 { 453 struct sabi_retval sretval; 454 int retval; 455 int i; 456 457 /* Read the state */ 458 retval = sabi_get_command(sabi_config->commands.get_performance_level, 459 &sretval); 460 if (retval) 461 return retval; 462 463 /* The logic is backwards, yeah, lots of fun... */ 464 for (i = 0; sabi_config->performance_levels[i].name; ++i) { 465 if (sretval.retval[0] == sabi_config->performance_levels[i].value) 466 return sprintf(buf, "%s\n", sabi_config->performance_levels[i].name); 467 } 468 return sprintf(buf, "%s\n", "unknown"); 469 } 470 471 static ssize_t set_performance_level(struct device *dev, 472 struct device_attribute *attr, const char *buf, 473 size_t count) 474 { 475 if (count >= 1) { 476 int i; 477 for (i = 0; sabi_config->performance_levels[i].name; ++i) { 478 const struct sabi_performance_level *level = 479 &sabi_config->performance_levels[i]; 480 if (!strncasecmp(level->name, buf, strlen(level->name))) { 481 sabi_set_command(sabi_config->commands.set_performance_level, 482 level->value); 483 break; 484 } 485 } 486 if (!sabi_config->performance_levels[i].name) 487 return -EINVAL; 488 } 489 return count; 490 } 491 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO, 492 get_performance_level, set_performance_level); 493 494 495 static int __init dmi_check_cb(const struct dmi_system_id *id) 496 { 497 pr_info("found laptop model '%s'\n", 498 id->ident); 499 return 1; 500 } 501 502 static struct dmi_system_id __initdata samsung_dmi_table[] = { 503 { 504 .ident = "N128", 505 .matches = { 506 DMI_MATCH(DMI_SYS_VENDOR, 507 "SAMSUNG ELECTRONICS CO., LTD."), 508 DMI_MATCH(DMI_PRODUCT_NAME, "N128"), 509 DMI_MATCH(DMI_BOARD_NAME, "N128"), 510 }, 511 .callback = dmi_check_cb, 512 }, 513 { 514 .ident = "N130", 515 .matches = { 516 DMI_MATCH(DMI_SYS_VENDOR, 517 "SAMSUNG ELECTRONICS CO., LTD."), 518 DMI_MATCH(DMI_PRODUCT_NAME, "N130"), 519 DMI_MATCH(DMI_BOARD_NAME, "N130"), 520 }, 521 .callback = dmi_check_cb, 522 }, 523 { 524 .ident = "N510", 525 .matches = { 526 DMI_MATCH(DMI_SYS_VENDOR, 527 "SAMSUNG ELECTRONICS CO., LTD."), 528 DMI_MATCH(DMI_PRODUCT_NAME, "N510"), 529 DMI_MATCH(DMI_BOARD_NAME, "N510"), 530 }, 531 .callback = dmi_check_cb, 532 }, 533 { 534 .ident = "X125", 535 .matches = { 536 DMI_MATCH(DMI_SYS_VENDOR, 537 "SAMSUNG ELECTRONICS CO., LTD."), 538 DMI_MATCH(DMI_PRODUCT_NAME, "X125"), 539 DMI_MATCH(DMI_BOARD_NAME, "X125"), 540 }, 541 .callback = dmi_check_cb, 542 }, 543 { 544 .ident = "X120/X170", 545 .matches = { 546 DMI_MATCH(DMI_SYS_VENDOR, 547 "SAMSUNG ELECTRONICS CO., LTD."), 548 DMI_MATCH(DMI_PRODUCT_NAME, "X120/X170"), 549 DMI_MATCH(DMI_BOARD_NAME, "X120/X170"), 550 }, 551 .callback = dmi_check_cb, 552 }, 553 { 554 .ident = "NC10", 555 .matches = { 556 DMI_MATCH(DMI_SYS_VENDOR, 557 "SAMSUNG ELECTRONICS CO., LTD."), 558 DMI_MATCH(DMI_PRODUCT_NAME, "NC10"), 559 DMI_MATCH(DMI_BOARD_NAME, "NC10"), 560 }, 561 .callback = dmi_check_cb, 562 }, 563 { 564 .ident = "NP-Q45", 565 .matches = { 566 DMI_MATCH(DMI_SYS_VENDOR, 567 "SAMSUNG ELECTRONICS CO., LTD."), 568 DMI_MATCH(DMI_PRODUCT_NAME, "SQ45S70S"), 569 DMI_MATCH(DMI_BOARD_NAME, "SQ45S70S"), 570 }, 571 .callback = dmi_check_cb, 572 }, 573 { 574 .ident = "X360", 575 .matches = { 576 DMI_MATCH(DMI_SYS_VENDOR, 577 "SAMSUNG ELECTRONICS CO., LTD."), 578 DMI_MATCH(DMI_PRODUCT_NAME, "X360"), 579 DMI_MATCH(DMI_BOARD_NAME, "X360"), 580 }, 581 .callback = dmi_check_cb, 582 }, 583 { 584 .ident = "R410 Plus", 585 .matches = { 586 DMI_MATCH(DMI_SYS_VENDOR, 587 "SAMSUNG ELECTRONICS CO., LTD."), 588 DMI_MATCH(DMI_PRODUCT_NAME, "R410P"), 589 DMI_MATCH(DMI_BOARD_NAME, "R460"), 590 }, 591 .callback = dmi_check_cb, 592 }, 593 { 594 .ident = "R518", 595 .matches = { 596 DMI_MATCH(DMI_SYS_VENDOR, 597 "SAMSUNG ELECTRONICS CO., LTD."), 598 DMI_MATCH(DMI_PRODUCT_NAME, "R518"), 599 DMI_MATCH(DMI_BOARD_NAME, "R518"), 600 }, 601 .callback = dmi_check_cb, 602 }, 603 { 604 .ident = "R519/R719", 605 .matches = { 606 DMI_MATCH(DMI_SYS_VENDOR, 607 "SAMSUNG ELECTRONICS CO., LTD."), 608 DMI_MATCH(DMI_PRODUCT_NAME, "R519/R719"), 609 DMI_MATCH(DMI_BOARD_NAME, "R519/R719"), 610 }, 611 .callback = dmi_check_cb, 612 }, 613 { 614 .ident = "N150/N210/N220", 615 .matches = { 616 DMI_MATCH(DMI_SYS_VENDOR, 617 "SAMSUNG ELECTRONICS CO., LTD."), 618 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"), 619 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"), 620 }, 621 .callback = dmi_check_cb, 622 }, 623 { 624 .ident = "N150/N210/N220/N230", 625 .matches = { 626 DMI_MATCH(DMI_SYS_VENDOR, 627 "SAMSUNG ELECTRONICS CO., LTD."), 628 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220/N230"), 629 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220/N230"), 630 }, 631 .callback = dmi_check_cb, 632 }, 633 { 634 .ident = "N150P/N210P/N220P", 635 .matches = { 636 DMI_MATCH(DMI_SYS_VENDOR, 637 "SAMSUNG ELECTRONICS CO., LTD."), 638 DMI_MATCH(DMI_PRODUCT_NAME, "N150P/N210P/N220P"), 639 DMI_MATCH(DMI_BOARD_NAME, "N150P/N210P/N220P"), 640 }, 641 .callback = dmi_check_cb, 642 }, 643 { 644 .ident = "R530/R730", 645 .matches = { 646 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 647 DMI_MATCH(DMI_PRODUCT_NAME, "R530/R730"), 648 DMI_MATCH(DMI_BOARD_NAME, "R530/R730"), 649 }, 650 .callback = dmi_check_cb, 651 }, 652 { 653 .ident = "NF110/NF210/NF310", 654 .matches = { 655 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 656 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"), 657 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"), 658 }, 659 .callback = dmi_check_cb, 660 }, 661 { 662 .ident = "N145P/N250P/N260P", 663 .matches = { 664 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 665 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"), 666 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"), 667 }, 668 .callback = dmi_check_cb, 669 }, 670 { 671 .ident = "R70/R71", 672 .matches = { 673 DMI_MATCH(DMI_SYS_VENDOR, 674 "SAMSUNG ELECTRONICS CO., LTD."), 675 DMI_MATCH(DMI_PRODUCT_NAME, "R70/R71"), 676 DMI_MATCH(DMI_BOARD_NAME, "R70/R71"), 677 }, 678 .callback = dmi_check_cb, 679 }, 680 { 681 .ident = "P460", 682 .matches = { 683 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 684 DMI_MATCH(DMI_PRODUCT_NAME, "P460"), 685 DMI_MATCH(DMI_BOARD_NAME, "P460"), 686 }, 687 .callback = dmi_check_cb, 688 }, 689 { }, 690 }; 691 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table); 692 693 static int find_signature(void __iomem *memcheck, const char *testStr) 694 { 695 int i = 0; 696 int loca; 697 698 for (loca = 0; loca < 0xffff; loca++) { 699 char temp = readb(memcheck + loca); 700 701 if (temp == testStr[i]) { 702 if (i == strlen(testStr)-1) 703 break; 704 ++i; 705 } else { 706 i = 0; 707 } 708 } 709 return loca; 710 } 711 712 static int __init samsung_init(void) 713 { 714 struct backlight_properties props; 715 struct sabi_retval sretval; 716 unsigned int ifaceP; 717 int i; 718 int loca; 719 int retval; 720 721 mutex_init(&sabi_mutex); 722 723 if (!force && !dmi_check_system(samsung_dmi_table)) 724 return -ENODEV; 725 726 f0000_segment = ioremap_nocache(0xf0000, 0xffff); 727 if (!f0000_segment) { 728 pr_err("Can't map the segment at 0xf0000\n"); 729 return -EINVAL; 730 } 731 732 /* Try to find one of the signatures in memory to find the header */ 733 for (i = 0; sabi_configs[i].test_string != 0; ++i) { 734 sabi_config = &sabi_configs[i]; 735 loca = find_signature(f0000_segment, sabi_config->test_string); 736 if (loca != 0xffff) 737 break; 738 } 739 740 if (loca == 0xffff) { 741 pr_err("This computer does not support SABI\n"); 742 goto error_no_signature; 743 } 744 745 /* point to the SMI port Number */ 746 loca += 1; 747 sabi = (f0000_segment + loca); 748 749 if (debug) { 750 printk(KERN_DEBUG "This computer supports SABI==%x\n", 751 loca + 0xf0000 - 6); 752 printk(KERN_DEBUG "SABI header:\n"); 753 printk(KERN_DEBUG " SMI Port Number = 0x%04x\n", 754 readw(sabi + sabi_config->header_offsets.port)); 755 printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n", 756 readb(sabi + sabi_config->header_offsets.iface_func)); 757 printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n", 758 readb(sabi + sabi_config->header_offsets.en_mem)); 759 printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n", 760 readb(sabi + sabi_config->header_offsets.re_mem)); 761 printk(KERN_DEBUG " SABI data offset = 0x%04x\n", 762 readw(sabi + sabi_config->header_offsets.data_offset)); 763 printk(KERN_DEBUG " SABI data segment = 0x%04x\n", 764 readw(sabi + sabi_config->header_offsets.data_segment)); 765 } 766 767 /* Get a pointer to the SABI Interface */ 768 ifaceP = (readw(sabi + sabi_config->header_offsets.data_segment) & 0x0ffff) << 4; 769 ifaceP += readw(sabi + sabi_config->header_offsets.data_offset) & 0x0ffff; 770 sabi_iface = ioremap_nocache(ifaceP, 16); 771 if (!sabi_iface) { 772 pr_err("Can't remap %x\n", ifaceP); 773 goto exit; 774 } 775 if (debug) { 776 printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP); 777 printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface); 778 779 test_backlight(); 780 test_wireless(); 781 782 retval = sabi_get_command(sabi_config->commands.get_brightness, 783 &sretval); 784 printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]); 785 } 786 787 /* Turn on "Linux" mode in the BIOS */ 788 if (sabi_config->commands.set_linux != 0xff) { 789 retval = sabi_set_command(sabi_config->commands.set_linux, 790 0x81); 791 if (retval) { 792 pr_warn("Linux mode was not set!\n"); 793 goto error_no_platform; 794 } 795 } 796 797 /* knock up a platform device to hang stuff off of */ 798 sdev = platform_device_register_simple("samsung", -1, NULL, 0); 799 if (IS_ERR(sdev)) 800 goto error_no_platform; 801 802 /* create a backlight device to talk to this one */ 803 memset(&props, 0, sizeof(struct backlight_properties)); 804 props.type = BACKLIGHT_PLATFORM; 805 props.max_brightness = sabi_config->max_brightness; 806 backlight_device = backlight_device_register("samsung", &sdev->dev, 807 NULL, &backlight_ops, 808 &props); 809 if (IS_ERR(backlight_device)) 810 goto error_no_backlight; 811 812 backlight_device->props.brightness = read_brightness(); 813 backlight_device->props.power = FB_BLANK_UNBLANK; 814 backlight_update_status(backlight_device); 815 816 retval = init_wireless(sdev); 817 if (retval) 818 goto error_no_rfk; 819 820 retval = device_create_file(&sdev->dev, &dev_attr_performance_level); 821 if (retval) 822 goto error_file_create; 823 824 exit: 825 return 0; 826 827 error_file_create: 828 destroy_wireless(); 829 830 error_no_rfk: 831 backlight_device_unregister(backlight_device); 832 833 error_no_backlight: 834 platform_device_unregister(sdev); 835 836 error_no_platform: 837 iounmap(sabi_iface); 838 839 error_no_signature: 840 iounmap(f0000_segment); 841 return -EINVAL; 842 } 843 844 static void __exit samsung_exit(void) 845 { 846 /* Turn off "Linux" mode in the BIOS */ 847 if (sabi_config->commands.set_linux != 0xff) 848 sabi_set_command(sabi_config->commands.set_linux, 0x80); 849 850 device_remove_file(&sdev->dev, &dev_attr_performance_level); 851 backlight_device_unregister(backlight_device); 852 destroy_wireless(); 853 iounmap(sabi_iface); 854 iounmap(f0000_segment); 855 platform_device_unregister(sdev); 856 } 857 858 module_init(samsung_init); 859 module_exit(samsung_exit); 860 861 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>"); 862 MODULE_DESCRIPTION("Samsung Backlight driver"); 863 MODULE_LICENSE("GPL"); 864