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 static bool has_stepping_quirk; 230 231 static bool force; 232 module_param(force, bool, 0); 233 MODULE_PARM_DESC(force, 234 "Disable the DMI check and forces the driver to be loaded"); 235 236 static bool debug; 237 module_param(debug, bool, S_IRUGO | S_IWUSR); 238 MODULE_PARM_DESC(debug, "Debug enabled or not"); 239 240 static int sabi_get_command(u8 command, struct sabi_retval *sretval) 241 { 242 int retval = 0; 243 u16 port = readw(sabi + sabi_config->header_offsets.port); 244 u8 complete, iface_data; 245 246 mutex_lock(&sabi_mutex); 247 248 /* enable memory to be able to write to it */ 249 outb(readb(sabi + sabi_config->header_offsets.en_mem), port); 250 251 /* write out the command */ 252 writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN); 253 writew(command, sabi_iface + SABI_IFACE_SUB); 254 writeb(0, sabi_iface + SABI_IFACE_COMPLETE); 255 outb(readb(sabi + sabi_config->header_offsets.iface_func), port); 256 257 /* write protect memory to make it safe */ 258 outb(readb(sabi + sabi_config->header_offsets.re_mem), port); 259 260 /* see if the command actually succeeded */ 261 complete = readb(sabi_iface + SABI_IFACE_COMPLETE); 262 iface_data = readb(sabi_iface + SABI_IFACE_DATA); 263 if (complete != 0xaa || iface_data == 0xff) { 264 pr_warn("SABI get command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n", 265 command, complete, iface_data); 266 retval = -EINVAL; 267 goto exit; 268 } 269 /* 270 * Save off the data into a structure so the caller use it. 271 * Right now we only want the first 4 bytes, 272 * There are commands that need more, but not for the ones we 273 * currently care about. 274 */ 275 sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA); 276 sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1); 277 sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2); 278 sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3); 279 280 exit: 281 mutex_unlock(&sabi_mutex); 282 return retval; 283 284 } 285 286 static int sabi_set_command(u8 command, u8 data) 287 { 288 int retval = 0; 289 u16 port = readw(sabi + sabi_config->header_offsets.port); 290 u8 complete, iface_data; 291 292 mutex_lock(&sabi_mutex); 293 294 /* enable memory to be able to write to it */ 295 outb(readb(sabi + sabi_config->header_offsets.en_mem), port); 296 297 /* write out the command */ 298 writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN); 299 writew(command, sabi_iface + SABI_IFACE_SUB); 300 writeb(0, sabi_iface + SABI_IFACE_COMPLETE); 301 writeb(data, sabi_iface + SABI_IFACE_DATA); 302 outb(readb(sabi + sabi_config->header_offsets.iface_func), port); 303 304 /* write protect memory to make it safe */ 305 outb(readb(sabi + sabi_config->header_offsets.re_mem), port); 306 307 /* see if the command actually succeeded */ 308 complete = readb(sabi_iface + SABI_IFACE_COMPLETE); 309 iface_data = readb(sabi_iface + SABI_IFACE_DATA); 310 if (complete != 0xaa || iface_data == 0xff) { 311 pr_warn("SABI set command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n", 312 command, complete, iface_data); 313 retval = -EINVAL; 314 } 315 316 mutex_unlock(&sabi_mutex); 317 return retval; 318 } 319 320 static void test_backlight(void) 321 { 322 struct sabi_retval sretval; 323 324 sabi_get_command(sabi_config->commands.get_backlight, &sretval); 325 printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); 326 327 sabi_set_command(sabi_config->commands.set_backlight, 0); 328 printk(KERN_DEBUG "backlight should be off\n"); 329 330 sabi_get_command(sabi_config->commands.get_backlight, &sretval); 331 printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); 332 333 msleep(1000); 334 335 sabi_set_command(sabi_config->commands.set_backlight, 1); 336 printk(KERN_DEBUG "backlight should be on\n"); 337 338 sabi_get_command(sabi_config->commands.get_backlight, &sretval); 339 printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); 340 } 341 342 static void test_wireless(void) 343 { 344 struct sabi_retval sretval; 345 346 sabi_get_command(sabi_config->commands.get_wireless_button, &sretval); 347 printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); 348 349 sabi_set_command(sabi_config->commands.set_wireless_button, 0); 350 printk(KERN_DEBUG "wireless led should be off\n"); 351 352 sabi_get_command(sabi_config->commands.get_wireless_button, &sretval); 353 printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); 354 355 msleep(1000); 356 357 sabi_set_command(sabi_config->commands.set_wireless_button, 1); 358 printk(KERN_DEBUG "wireless led should be on\n"); 359 360 sabi_get_command(sabi_config->commands.get_wireless_button, &sretval); 361 printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); 362 } 363 364 static u8 read_brightness(void) 365 { 366 struct sabi_retval sretval; 367 int user_brightness = 0; 368 int retval; 369 370 retval = sabi_get_command(sabi_config->commands.get_brightness, 371 &sretval); 372 if (!retval) { 373 user_brightness = sretval.retval[0]; 374 if (user_brightness > sabi_config->min_brightness) 375 user_brightness -= sabi_config->min_brightness; 376 else 377 user_brightness = 0; 378 } 379 return user_brightness; 380 } 381 382 static void set_brightness(u8 user_brightness) 383 { 384 u8 user_level = user_brightness + sabi_config->min_brightness; 385 386 if (has_stepping_quirk && user_level != 0) { 387 /* 388 * short circuit if the specified level is what's already set 389 * to prevent the screen from flickering needlessly 390 */ 391 if (user_brightness == read_brightness()) 392 return; 393 394 sabi_set_command(sabi_config->commands.set_brightness, 0); 395 } 396 397 sabi_set_command(sabi_config->commands.set_brightness, user_level); 398 } 399 400 static int get_brightness(struct backlight_device *bd) 401 { 402 return (int)read_brightness(); 403 } 404 405 static void check_for_stepping_quirk(void) 406 { 407 u8 initial_level; 408 u8 check_level; 409 u8 orig_level = read_brightness(); 410 411 /* 412 * Some laptops exhibit the strange behaviour of stepping toward 413 * (rather than setting) the brightness except when changing to/from 414 * brightness level 0. This behaviour is checked for here and worked 415 * around in set_brightness. 416 */ 417 418 if (orig_level == 0) 419 set_brightness(1); 420 421 initial_level = read_brightness(); 422 423 if (initial_level <= 2) 424 check_level = initial_level + 2; 425 else 426 check_level = initial_level - 2; 427 428 has_stepping_quirk = false; 429 set_brightness(check_level); 430 431 if (read_brightness() != check_level) { 432 has_stepping_quirk = true; 433 pr_info("enabled workaround for brightness stepping quirk\n"); 434 } 435 436 set_brightness(orig_level); 437 } 438 439 static int update_status(struct backlight_device *bd) 440 { 441 set_brightness(bd->props.brightness); 442 443 if (bd->props.power == FB_BLANK_UNBLANK) 444 sabi_set_command(sabi_config->commands.set_backlight, 1); 445 else 446 sabi_set_command(sabi_config->commands.set_backlight, 0); 447 return 0; 448 } 449 450 static const struct backlight_ops backlight_ops = { 451 .get_brightness = get_brightness, 452 .update_status = update_status, 453 }; 454 455 static int rfkill_set(void *data, bool blocked) 456 { 457 /* Do something with blocked...*/ 458 /* 459 * blocked == false is on 460 * blocked == true is off 461 */ 462 if (blocked) 463 sabi_set_command(sabi_config->commands.set_wireless_button, 0); 464 else 465 sabi_set_command(sabi_config->commands.set_wireless_button, 1); 466 467 return 0; 468 } 469 470 static struct rfkill_ops rfkill_ops = { 471 .set_block = rfkill_set, 472 }; 473 474 static int init_wireless(struct platform_device *sdev) 475 { 476 int retval; 477 478 rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN, 479 &rfkill_ops, NULL); 480 if (!rfk) 481 return -ENOMEM; 482 483 retval = rfkill_register(rfk); 484 if (retval) { 485 rfkill_destroy(rfk); 486 return -ENODEV; 487 } 488 489 return 0; 490 } 491 492 static void destroy_wireless(void) 493 { 494 rfkill_unregister(rfk); 495 rfkill_destroy(rfk); 496 } 497 498 static ssize_t get_performance_level(struct device *dev, 499 struct device_attribute *attr, char *buf) 500 { 501 struct sabi_retval sretval; 502 int retval; 503 int i; 504 505 /* Read the state */ 506 retval = sabi_get_command(sabi_config->commands.get_performance_level, 507 &sretval); 508 if (retval) 509 return retval; 510 511 /* The logic is backwards, yeah, lots of fun... */ 512 for (i = 0; sabi_config->performance_levels[i].name; ++i) { 513 if (sretval.retval[0] == sabi_config->performance_levels[i].value) 514 return sprintf(buf, "%s\n", sabi_config->performance_levels[i].name); 515 } 516 return sprintf(buf, "%s\n", "unknown"); 517 } 518 519 static ssize_t set_performance_level(struct device *dev, 520 struct device_attribute *attr, const char *buf, 521 size_t count) 522 { 523 if (count >= 1) { 524 int i; 525 for (i = 0; sabi_config->performance_levels[i].name; ++i) { 526 const struct sabi_performance_level *level = 527 &sabi_config->performance_levels[i]; 528 if (!strncasecmp(level->name, buf, strlen(level->name))) { 529 sabi_set_command(sabi_config->commands.set_performance_level, 530 level->value); 531 break; 532 } 533 } 534 if (!sabi_config->performance_levels[i].name) 535 return -EINVAL; 536 } 537 return count; 538 } 539 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO, 540 get_performance_level, set_performance_level); 541 542 543 static int __init dmi_check_cb(const struct dmi_system_id *id) 544 { 545 pr_info("found laptop model '%s'\n", 546 id->ident); 547 return 1; 548 } 549 550 static struct dmi_system_id __initdata samsung_dmi_table[] = { 551 { 552 .ident = "N128", 553 .matches = { 554 DMI_MATCH(DMI_SYS_VENDOR, 555 "SAMSUNG ELECTRONICS CO., LTD."), 556 DMI_MATCH(DMI_PRODUCT_NAME, "N128"), 557 DMI_MATCH(DMI_BOARD_NAME, "N128"), 558 }, 559 .callback = dmi_check_cb, 560 }, 561 { 562 .ident = "N130", 563 .matches = { 564 DMI_MATCH(DMI_SYS_VENDOR, 565 "SAMSUNG ELECTRONICS CO., LTD."), 566 DMI_MATCH(DMI_PRODUCT_NAME, "N130"), 567 DMI_MATCH(DMI_BOARD_NAME, "N130"), 568 }, 569 .callback = dmi_check_cb, 570 }, 571 { 572 .ident = "N510", 573 .matches = { 574 DMI_MATCH(DMI_SYS_VENDOR, 575 "SAMSUNG ELECTRONICS CO., LTD."), 576 DMI_MATCH(DMI_PRODUCT_NAME, "N510"), 577 DMI_MATCH(DMI_BOARD_NAME, "N510"), 578 }, 579 .callback = dmi_check_cb, 580 }, 581 { 582 .ident = "X125", 583 .matches = { 584 DMI_MATCH(DMI_SYS_VENDOR, 585 "SAMSUNG ELECTRONICS CO., LTD."), 586 DMI_MATCH(DMI_PRODUCT_NAME, "X125"), 587 DMI_MATCH(DMI_BOARD_NAME, "X125"), 588 }, 589 .callback = dmi_check_cb, 590 }, 591 { 592 .ident = "X120/X170", 593 .matches = { 594 DMI_MATCH(DMI_SYS_VENDOR, 595 "SAMSUNG ELECTRONICS CO., LTD."), 596 DMI_MATCH(DMI_PRODUCT_NAME, "X120/X170"), 597 DMI_MATCH(DMI_BOARD_NAME, "X120/X170"), 598 }, 599 .callback = dmi_check_cb, 600 }, 601 { 602 .ident = "NC10", 603 .matches = { 604 DMI_MATCH(DMI_SYS_VENDOR, 605 "SAMSUNG ELECTRONICS CO., LTD."), 606 DMI_MATCH(DMI_PRODUCT_NAME, "NC10"), 607 DMI_MATCH(DMI_BOARD_NAME, "NC10"), 608 }, 609 .callback = dmi_check_cb, 610 }, 611 { 612 .ident = "NP-Q45", 613 .matches = { 614 DMI_MATCH(DMI_SYS_VENDOR, 615 "SAMSUNG ELECTRONICS CO., LTD."), 616 DMI_MATCH(DMI_PRODUCT_NAME, "SQ45S70S"), 617 DMI_MATCH(DMI_BOARD_NAME, "SQ45S70S"), 618 }, 619 .callback = dmi_check_cb, 620 }, 621 { 622 .ident = "X360", 623 .matches = { 624 DMI_MATCH(DMI_SYS_VENDOR, 625 "SAMSUNG ELECTRONICS CO., LTD."), 626 DMI_MATCH(DMI_PRODUCT_NAME, "X360"), 627 DMI_MATCH(DMI_BOARD_NAME, "X360"), 628 }, 629 .callback = dmi_check_cb, 630 }, 631 { 632 .ident = "R410 Plus", 633 .matches = { 634 DMI_MATCH(DMI_SYS_VENDOR, 635 "SAMSUNG ELECTRONICS CO., LTD."), 636 DMI_MATCH(DMI_PRODUCT_NAME, "R410P"), 637 DMI_MATCH(DMI_BOARD_NAME, "R460"), 638 }, 639 .callback = dmi_check_cb, 640 }, 641 { 642 .ident = "R518", 643 .matches = { 644 DMI_MATCH(DMI_SYS_VENDOR, 645 "SAMSUNG ELECTRONICS CO., LTD."), 646 DMI_MATCH(DMI_PRODUCT_NAME, "R518"), 647 DMI_MATCH(DMI_BOARD_NAME, "R518"), 648 }, 649 .callback = dmi_check_cb, 650 }, 651 { 652 .ident = "R519/R719", 653 .matches = { 654 DMI_MATCH(DMI_SYS_VENDOR, 655 "SAMSUNG ELECTRONICS CO., LTD."), 656 DMI_MATCH(DMI_PRODUCT_NAME, "R519/R719"), 657 DMI_MATCH(DMI_BOARD_NAME, "R519/R719"), 658 }, 659 .callback = dmi_check_cb, 660 }, 661 { 662 .ident = "N150/N210/N220", 663 .matches = { 664 DMI_MATCH(DMI_SYS_VENDOR, 665 "SAMSUNG ELECTRONICS CO., LTD."), 666 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"), 667 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"), 668 }, 669 .callback = dmi_check_cb, 670 }, 671 { 672 .ident = "N220", 673 .matches = { 674 DMI_MATCH(DMI_SYS_VENDOR, 675 "SAMSUNG ELECTRONICS CO., LTD."), 676 DMI_MATCH(DMI_PRODUCT_NAME, "N220"), 677 DMI_MATCH(DMI_BOARD_NAME, "N220"), 678 }, 679 .callback = dmi_check_cb, 680 }, 681 { 682 .ident = "N150/N210/N220/N230", 683 .matches = { 684 DMI_MATCH(DMI_SYS_VENDOR, 685 "SAMSUNG ELECTRONICS CO., LTD."), 686 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220/N230"), 687 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220/N230"), 688 }, 689 .callback = dmi_check_cb, 690 }, 691 { 692 .ident = "N150P/N210P/N220P", 693 .matches = { 694 DMI_MATCH(DMI_SYS_VENDOR, 695 "SAMSUNG ELECTRONICS CO., LTD."), 696 DMI_MATCH(DMI_PRODUCT_NAME, "N150P/N210P/N220P"), 697 DMI_MATCH(DMI_BOARD_NAME, "N150P/N210P/N220P"), 698 }, 699 .callback = dmi_check_cb, 700 }, 701 { 702 .ident = "R700", 703 .matches = { 704 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 705 DMI_MATCH(DMI_PRODUCT_NAME, "SR700"), 706 DMI_MATCH(DMI_BOARD_NAME, "SR700"), 707 }, 708 .callback = dmi_check_cb, 709 }, 710 { 711 .ident = "R530/R730", 712 .matches = { 713 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 714 DMI_MATCH(DMI_PRODUCT_NAME, "R530/R730"), 715 DMI_MATCH(DMI_BOARD_NAME, "R530/R730"), 716 }, 717 .callback = dmi_check_cb, 718 }, 719 { 720 .ident = "NF110/NF210/NF310", 721 .matches = { 722 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 723 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"), 724 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"), 725 }, 726 .callback = dmi_check_cb, 727 }, 728 { 729 .ident = "N145P/N250P/N260P", 730 .matches = { 731 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 732 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"), 733 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"), 734 }, 735 .callback = dmi_check_cb, 736 }, 737 { 738 .ident = "R70/R71", 739 .matches = { 740 DMI_MATCH(DMI_SYS_VENDOR, 741 "SAMSUNG ELECTRONICS CO., LTD."), 742 DMI_MATCH(DMI_PRODUCT_NAME, "R70/R71"), 743 DMI_MATCH(DMI_BOARD_NAME, "R70/R71"), 744 }, 745 .callback = dmi_check_cb, 746 }, 747 { 748 .ident = "P460", 749 .matches = { 750 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 751 DMI_MATCH(DMI_PRODUCT_NAME, "P460"), 752 DMI_MATCH(DMI_BOARD_NAME, "P460"), 753 }, 754 .callback = dmi_check_cb, 755 }, 756 { 757 .ident = "R528/R728", 758 .matches = { 759 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 760 DMI_MATCH(DMI_PRODUCT_NAME, "R528/R728"), 761 DMI_MATCH(DMI_BOARD_NAME, "R528/R728"), 762 }, 763 .callback = dmi_check_cb, 764 }, 765 { 766 .ident = "NC210/NC110", 767 .matches = { 768 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 769 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"), 770 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"), 771 }, 772 .callback = dmi_check_cb, 773 }, 774 { 775 .ident = "X520", 776 .matches = { 777 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 778 DMI_MATCH(DMI_PRODUCT_NAME, "X520"), 779 DMI_MATCH(DMI_BOARD_NAME, "X520"), 780 }, 781 .callback = dmi_check_cb, 782 }, 783 { }, 784 }; 785 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table); 786 787 static int find_signature(void __iomem *memcheck, const char *testStr) 788 { 789 int i = 0; 790 int loca; 791 792 for (loca = 0; loca < 0xffff; loca++) { 793 char temp = readb(memcheck + loca); 794 795 if (temp == testStr[i]) { 796 if (i == strlen(testStr)-1) 797 break; 798 ++i; 799 } else { 800 i = 0; 801 } 802 } 803 return loca; 804 } 805 806 static int __init samsung_init(void) 807 { 808 struct backlight_properties props; 809 struct sabi_retval sretval; 810 unsigned int ifaceP; 811 int i; 812 int loca; 813 int retval; 814 815 mutex_init(&sabi_mutex); 816 817 if (!force && !dmi_check_system(samsung_dmi_table)) 818 return -ENODEV; 819 820 f0000_segment = ioremap_nocache(0xf0000, 0xffff); 821 if (!f0000_segment) { 822 pr_err("Can't map the segment at 0xf0000\n"); 823 return -EINVAL; 824 } 825 826 /* Try to find one of the signatures in memory to find the header */ 827 for (i = 0; sabi_configs[i].test_string != 0; ++i) { 828 sabi_config = &sabi_configs[i]; 829 loca = find_signature(f0000_segment, sabi_config->test_string); 830 if (loca != 0xffff) 831 break; 832 } 833 834 if (loca == 0xffff) { 835 pr_err("This computer does not support SABI\n"); 836 goto error_no_signature; 837 } 838 839 /* point to the SMI port Number */ 840 loca += 1; 841 sabi = (f0000_segment + loca); 842 843 if (debug) { 844 printk(KERN_DEBUG "This computer supports SABI==%x\n", 845 loca + 0xf0000 - 6); 846 printk(KERN_DEBUG "SABI header:\n"); 847 printk(KERN_DEBUG " SMI Port Number = 0x%04x\n", 848 readw(sabi + sabi_config->header_offsets.port)); 849 printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n", 850 readb(sabi + sabi_config->header_offsets.iface_func)); 851 printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n", 852 readb(sabi + sabi_config->header_offsets.en_mem)); 853 printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n", 854 readb(sabi + sabi_config->header_offsets.re_mem)); 855 printk(KERN_DEBUG " SABI data offset = 0x%04x\n", 856 readw(sabi + sabi_config->header_offsets.data_offset)); 857 printk(KERN_DEBUG " SABI data segment = 0x%04x\n", 858 readw(sabi + sabi_config->header_offsets.data_segment)); 859 } 860 861 /* Get a pointer to the SABI Interface */ 862 ifaceP = (readw(sabi + sabi_config->header_offsets.data_segment) & 0x0ffff) << 4; 863 ifaceP += readw(sabi + sabi_config->header_offsets.data_offset) & 0x0ffff; 864 sabi_iface = ioremap_nocache(ifaceP, 16); 865 if (!sabi_iface) { 866 pr_err("Can't remap %x\n", ifaceP); 867 goto error_no_signature; 868 } 869 if (debug) { 870 printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP); 871 printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface); 872 873 test_backlight(); 874 test_wireless(); 875 876 retval = sabi_get_command(sabi_config->commands.get_brightness, 877 &sretval); 878 printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]); 879 } 880 881 /* Turn on "Linux" mode in the BIOS */ 882 if (sabi_config->commands.set_linux != 0xff) { 883 retval = sabi_set_command(sabi_config->commands.set_linux, 884 0x81); 885 if (retval) { 886 pr_warn("Linux mode was not set!\n"); 887 goto error_no_platform; 888 } 889 } 890 891 /* Check for stepping quirk */ 892 check_for_stepping_quirk(); 893 894 /* knock up a platform device to hang stuff off of */ 895 sdev = platform_device_register_simple("samsung", -1, NULL, 0); 896 if (IS_ERR(sdev)) 897 goto error_no_platform; 898 899 /* create a backlight device to talk to this one */ 900 memset(&props, 0, sizeof(struct backlight_properties)); 901 props.type = BACKLIGHT_PLATFORM; 902 props.max_brightness = sabi_config->max_brightness - 903 sabi_config->min_brightness; 904 backlight_device = backlight_device_register("samsung", &sdev->dev, 905 NULL, &backlight_ops, 906 &props); 907 if (IS_ERR(backlight_device)) 908 goto error_no_backlight; 909 910 backlight_device->props.brightness = read_brightness(); 911 backlight_device->props.power = FB_BLANK_UNBLANK; 912 backlight_update_status(backlight_device); 913 914 retval = init_wireless(sdev); 915 if (retval) 916 goto error_no_rfk; 917 918 retval = device_create_file(&sdev->dev, &dev_attr_performance_level); 919 if (retval) 920 goto error_file_create; 921 922 return 0; 923 924 error_file_create: 925 destroy_wireless(); 926 927 error_no_rfk: 928 backlight_device_unregister(backlight_device); 929 930 error_no_backlight: 931 platform_device_unregister(sdev); 932 933 error_no_platform: 934 iounmap(sabi_iface); 935 936 error_no_signature: 937 iounmap(f0000_segment); 938 return -EINVAL; 939 } 940 941 static void __exit samsung_exit(void) 942 { 943 /* Turn off "Linux" mode in the BIOS */ 944 if (sabi_config->commands.set_linux != 0xff) 945 sabi_set_command(sabi_config->commands.set_linux, 0x80); 946 947 device_remove_file(&sdev->dev, &dev_attr_performance_level); 948 backlight_device_unregister(backlight_device); 949 destroy_wireless(); 950 iounmap(sabi_iface); 951 iounmap(f0000_segment); 952 platform_device_unregister(sdev); 953 } 954 955 module_init(samsung_init); 956 module_exit(samsung_exit); 957 958 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>"); 959 MODULE_DESCRIPTION("Samsung Backlight driver"); 960 MODULE_LICENSE("GPL"); 961