1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature 4 * sensors, fan control, keyboard backlight control) used in Intel-based Apple 5 * computers. 6 * 7 * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch> 8 * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se> 9 * 10 * Based on hdaps.c driver: 11 * Copyright (C) 2005 Robert Love <rml@novell.com> 12 * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net> 13 * 14 * Fan control based on smcFanControl: 15 * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com> 16 */ 17 18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 19 20 #include <linux/delay.h> 21 #include <linux/platform_device.h> 22 #include <linux/input-polldev.h> 23 #include <linux/kernel.h> 24 #include <linux/slab.h> 25 #include <linux/module.h> 26 #include <linux/timer.h> 27 #include <linux/dmi.h> 28 #include <linux/mutex.h> 29 #include <linux/hwmon-sysfs.h> 30 #include <linux/io.h> 31 #include <linux/leds.h> 32 #include <linux/hwmon.h> 33 #include <linux/workqueue.h> 34 #include <linux/err.h> 35 36 /* data port used by Apple SMC */ 37 #define APPLESMC_DATA_PORT 0x300 38 /* command/status port used by Apple SMC */ 39 #define APPLESMC_CMD_PORT 0x304 40 41 #define APPLESMC_NR_PORTS 32 /* 0x300-0x31f */ 42 43 #define APPLESMC_MAX_DATA_LENGTH 32 44 45 /* wait up to 128 ms for a status change. */ 46 #define APPLESMC_MIN_WAIT 0x0010 47 #define APPLESMC_RETRY_WAIT 0x0100 48 #define APPLESMC_MAX_WAIT 0x20000 49 50 #define APPLESMC_READ_CMD 0x10 51 #define APPLESMC_WRITE_CMD 0x11 52 #define APPLESMC_GET_KEY_BY_INDEX_CMD 0x12 53 #define APPLESMC_GET_KEY_TYPE_CMD 0x13 54 55 #define KEY_COUNT_KEY "#KEY" /* r-o ui32 */ 56 57 #define LIGHT_SENSOR_LEFT_KEY "ALV0" /* r-o {alv (6-10 bytes) */ 58 #define LIGHT_SENSOR_RIGHT_KEY "ALV1" /* r-o {alv (6-10 bytes) */ 59 #define BACKLIGHT_KEY "LKSB" /* w-o {lkb (2 bytes) */ 60 61 #define CLAMSHELL_KEY "MSLD" /* r-o ui8 (unused) */ 62 63 #define MOTION_SENSOR_X_KEY "MO_X" /* r-o sp78 (2 bytes) */ 64 #define MOTION_SENSOR_Y_KEY "MO_Y" /* r-o sp78 (2 bytes) */ 65 #define MOTION_SENSOR_Z_KEY "MO_Z" /* r-o sp78 (2 bytes) */ 66 #define MOTION_SENSOR_KEY "MOCN" /* r/w ui16 */ 67 68 #define FANS_COUNT "FNum" /* r-o ui8 */ 69 #define FANS_MANUAL "FS! " /* r-w ui16 */ 70 #define FAN_ID_FMT "F%dID" /* r-o char[16] */ 71 72 #define TEMP_SENSOR_TYPE "sp78" 73 74 /* List of keys used to read/write fan speeds */ 75 static const char *const fan_speed_fmt[] = { 76 "F%dAc", /* actual speed */ 77 "F%dMn", /* minimum speed (rw) */ 78 "F%dMx", /* maximum speed */ 79 "F%dSf", /* safe speed - not all models */ 80 "F%dTg", /* target speed (manual: rw) */ 81 }; 82 83 #define INIT_TIMEOUT_MSECS 5000 /* wait up to 5s for device init ... */ 84 #define INIT_WAIT_MSECS 50 /* ... in 50ms increments */ 85 86 #define APPLESMC_POLL_INTERVAL 50 /* msecs */ 87 #define APPLESMC_INPUT_FUZZ 4 /* input event threshold */ 88 #define APPLESMC_INPUT_FLAT 4 89 90 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff) 91 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16) 92 93 /* Dynamic device node attributes */ 94 struct applesmc_dev_attr { 95 struct sensor_device_attribute sda; /* hwmon attributes */ 96 char name[32]; /* room for node file name */ 97 }; 98 99 /* Dynamic device node group */ 100 struct applesmc_node_group { 101 char *format; /* format string */ 102 void *show; /* show function */ 103 void *store; /* store function */ 104 int option; /* function argument */ 105 struct applesmc_dev_attr *nodes; /* dynamic node array */ 106 }; 107 108 /* AppleSMC entry - cached register information */ 109 struct applesmc_entry { 110 char key[5]; /* four-letter key code */ 111 u8 valid; /* set when entry is successfully read once */ 112 u8 len; /* bounded by APPLESMC_MAX_DATA_LENGTH */ 113 char type[5]; /* four-letter type code */ 114 u8 flags; /* 0x10: func; 0x40: write; 0x80: read */ 115 }; 116 117 /* Register lookup and registers common to all SMCs */ 118 static struct applesmc_registers { 119 struct mutex mutex; /* register read/write mutex */ 120 unsigned int key_count; /* number of SMC registers */ 121 unsigned int fan_count; /* number of fans */ 122 unsigned int temp_count; /* number of temperature registers */ 123 unsigned int temp_begin; /* temperature lower index bound */ 124 unsigned int temp_end; /* temperature upper index bound */ 125 unsigned int index_count; /* size of temperature index array */ 126 int num_light_sensors; /* number of light sensors */ 127 bool has_accelerometer; /* has motion sensor */ 128 bool has_key_backlight; /* has keyboard backlight */ 129 bool init_complete; /* true when fully initialized */ 130 struct applesmc_entry *cache; /* cached key entries */ 131 const char **index; /* temperature key index */ 132 } smcreg = { 133 .mutex = __MUTEX_INITIALIZER(smcreg.mutex), 134 }; 135 136 static const int debug; 137 static struct platform_device *pdev; 138 static s16 rest_x; 139 static s16 rest_y; 140 static u8 backlight_state[2]; 141 142 static struct device *hwmon_dev; 143 static struct input_polled_dev *applesmc_idev; 144 145 /* 146 * Last index written to key_at_index sysfs file, and value to use for all other 147 * key_at_index_* sysfs files. 148 */ 149 static unsigned int key_at_index; 150 151 static struct workqueue_struct *applesmc_led_wq; 152 153 /* 154 * wait_read - Wait for a byte to appear on SMC port. Callers must 155 * hold applesmc_lock. 156 */ 157 static int wait_read(void) 158 { 159 u8 status; 160 int us; 161 for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) { 162 udelay(us); 163 status = inb(APPLESMC_CMD_PORT); 164 /* read: wait for smc to settle */ 165 if (status & 0x01) 166 return 0; 167 } 168 169 pr_warn("wait_read() fail: 0x%02x\n", status); 170 return -EIO; 171 } 172 173 /* 174 * send_byte - Write to SMC port, retrying when necessary. Callers 175 * must hold applesmc_lock. 176 */ 177 static int send_byte(u8 cmd, u16 port) 178 { 179 u8 status; 180 int us; 181 182 outb(cmd, port); 183 for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) { 184 udelay(us); 185 status = inb(APPLESMC_CMD_PORT); 186 /* write: wait for smc to settle */ 187 if (status & 0x02) 188 continue; 189 /* ready: cmd accepted, return */ 190 if (status & 0x04) 191 return 0; 192 /* timeout: give up */ 193 if (us << 1 == APPLESMC_MAX_WAIT) 194 break; 195 /* busy: long wait and resend */ 196 udelay(APPLESMC_RETRY_WAIT); 197 outb(cmd, port); 198 } 199 200 pr_warn("send_byte(0x%02x, 0x%04x) fail: 0x%02x\n", cmd, port, status); 201 return -EIO; 202 } 203 204 static int send_command(u8 cmd) 205 { 206 return send_byte(cmd, APPLESMC_CMD_PORT); 207 } 208 209 static int send_argument(const char *key) 210 { 211 int i; 212 213 for (i = 0; i < 4; i++) 214 if (send_byte(key[i], APPLESMC_DATA_PORT)) 215 return -EIO; 216 return 0; 217 } 218 219 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len) 220 { 221 u8 status, data = 0; 222 int i; 223 224 if (send_command(cmd) || send_argument(key)) { 225 pr_warn("%.4s: read arg fail\n", key); 226 return -EIO; 227 } 228 229 /* This has no effect on newer (2012) SMCs */ 230 if (send_byte(len, APPLESMC_DATA_PORT)) { 231 pr_warn("%.4s: read len fail\n", key); 232 return -EIO; 233 } 234 235 for (i = 0; i < len; i++) { 236 if (wait_read()) { 237 pr_warn("%.4s: read data[%d] fail\n", key, i); 238 return -EIO; 239 } 240 buffer[i] = inb(APPLESMC_DATA_PORT); 241 } 242 243 /* Read the data port until bit0 is cleared */ 244 for (i = 0; i < 16; i++) { 245 udelay(APPLESMC_MIN_WAIT); 246 status = inb(APPLESMC_CMD_PORT); 247 if (!(status & 0x01)) 248 break; 249 data = inb(APPLESMC_DATA_PORT); 250 } 251 if (i) 252 pr_warn("flushed %d bytes, last value is: %d\n", i, data); 253 254 return 0; 255 } 256 257 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len) 258 { 259 int i; 260 261 if (send_command(cmd) || send_argument(key)) { 262 pr_warn("%s: write arg fail\n", key); 263 return -EIO; 264 } 265 266 if (send_byte(len, APPLESMC_DATA_PORT)) { 267 pr_warn("%.4s: write len fail\n", key); 268 return -EIO; 269 } 270 271 for (i = 0; i < len; i++) { 272 if (send_byte(buffer[i], APPLESMC_DATA_PORT)) { 273 pr_warn("%s: write data fail\n", key); 274 return -EIO; 275 } 276 } 277 278 return 0; 279 } 280 281 static int read_register_count(unsigned int *count) 282 { 283 __be32 be; 284 int ret; 285 286 ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4); 287 if (ret) 288 return ret; 289 290 *count = be32_to_cpu(be); 291 return 0; 292 } 293 294 /* 295 * Serialized I/O 296 * 297 * Returns zero on success or a negative error on failure. 298 * All functions below are concurrency safe - callers should NOT hold lock. 299 */ 300 301 static int applesmc_read_entry(const struct applesmc_entry *entry, 302 u8 *buf, u8 len) 303 { 304 int ret; 305 306 if (entry->len != len) 307 return -EINVAL; 308 mutex_lock(&smcreg.mutex); 309 ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len); 310 mutex_unlock(&smcreg.mutex); 311 312 return ret; 313 } 314 315 static int applesmc_write_entry(const struct applesmc_entry *entry, 316 const u8 *buf, u8 len) 317 { 318 int ret; 319 320 if (entry->len != len) 321 return -EINVAL; 322 mutex_lock(&smcreg.mutex); 323 ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len); 324 mutex_unlock(&smcreg.mutex); 325 return ret; 326 } 327 328 static const struct applesmc_entry *applesmc_get_entry_by_index(int index) 329 { 330 struct applesmc_entry *cache = &smcreg.cache[index]; 331 u8 key[4], info[6]; 332 __be32 be; 333 int ret = 0; 334 335 if (cache->valid) 336 return cache; 337 338 mutex_lock(&smcreg.mutex); 339 340 if (cache->valid) 341 goto out; 342 be = cpu_to_be32(index); 343 ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4); 344 if (ret) 345 goto out; 346 ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6); 347 if (ret) 348 goto out; 349 350 memcpy(cache->key, key, 4); 351 cache->len = info[0]; 352 memcpy(cache->type, &info[1], 4); 353 cache->flags = info[5]; 354 cache->valid = 1; 355 356 out: 357 mutex_unlock(&smcreg.mutex); 358 if (ret) 359 return ERR_PTR(ret); 360 return cache; 361 } 362 363 static int applesmc_get_lower_bound(unsigned int *lo, const char *key) 364 { 365 int begin = 0, end = smcreg.key_count; 366 const struct applesmc_entry *entry; 367 368 while (begin != end) { 369 int middle = begin + (end - begin) / 2; 370 entry = applesmc_get_entry_by_index(middle); 371 if (IS_ERR(entry)) { 372 *lo = 0; 373 return PTR_ERR(entry); 374 } 375 if (strcmp(entry->key, key) < 0) 376 begin = middle + 1; 377 else 378 end = middle; 379 } 380 381 *lo = begin; 382 return 0; 383 } 384 385 static int applesmc_get_upper_bound(unsigned int *hi, const char *key) 386 { 387 int begin = 0, end = smcreg.key_count; 388 const struct applesmc_entry *entry; 389 390 while (begin != end) { 391 int middle = begin + (end - begin) / 2; 392 entry = applesmc_get_entry_by_index(middle); 393 if (IS_ERR(entry)) { 394 *hi = smcreg.key_count; 395 return PTR_ERR(entry); 396 } 397 if (strcmp(key, entry->key) < 0) 398 end = middle; 399 else 400 begin = middle + 1; 401 } 402 403 *hi = begin; 404 return 0; 405 } 406 407 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key) 408 { 409 int begin, end; 410 int ret; 411 412 ret = applesmc_get_lower_bound(&begin, key); 413 if (ret) 414 return ERR_PTR(ret); 415 ret = applesmc_get_upper_bound(&end, key); 416 if (ret) 417 return ERR_PTR(ret); 418 if (end - begin != 1) 419 return ERR_PTR(-EINVAL); 420 421 return applesmc_get_entry_by_index(begin); 422 } 423 424 static int applesmc_read_key(const char *key, u8 *buffer, u8 len) 425 { 426 const struct applesmc_entry *entry; 427 428 entry = applesmc_get_entry_by_key(key); 429 if (IS_ERR(entry)) 430 return PTR_ERR(entry); 431 432 return applesmc_read_entry(entry, buffer, len); 433 } 434 435 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len) 436 { 437 const struct applesmc_entry *entry; 438 439 entry = applesmc_get_entry_by_key(key); 440 if (IS_ERR(entry)) 441 return PTR_ERR(entry); 442 443 return applesmc_write_entry(entry, buffer, len); 444 } 445 446 static int applesmc_has_key(const char *key, bool *value) 447 { 448 const struct applesmc_entry *entry; 449 450 entry = applesmc_get_entry_by_key(key); 451 if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL) 452 return PTR_ERR(entry); 453 454 *value = !IS_ERR(entry); 455 return 0; 456 } 457 458 /* 459 * applesmc_read_s16 - Read 16-bit signed big endian register 460 */ 461 static int applesmc_read_s16(const char *key, s16 *value) 462 { 463 u8 buffer[2]; 464 int ret; 465 466 ret = applesmc_read_key(key, buffer, 2); 467 if (ret) 468 return ret; 469 470 *value = ((s16)buffer[0] << 8) | buffer[1]; 471 return 0; 472 } 473 474 /* 475 * applesmc_device_init - initialize the accelerometer. Can sleep. 476 */ 477 static void applesmc_device_init(void) 478 { 479 int total; 480 u8 buffer[2]; 481 482 if (!smcreg.has_accelerometer) 483 return; 484 485 for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) { 486 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) && 487 (buffer[0] != 0x00 || buffer[1] != 0x00)) 488 return; 489 buffer[0] = 0xe0; 490 buffer[1] = 0x00; 491 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2); 492 msleep(INIT_WAIT_MSECS); 493 } 494 495 pr_warn("failed to init the device\n"); 496 } 497 498 static int applesmc_init_index(struct applesmc_registers *s) 499 { 500 const struct applesmc_entry *entry; 501 unsigned int i; 502 503 if (s->index) 504 return 0; 505 506 s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL); 507 if (!s->index) 508 return -ENOMEM; 509 510 for (i = s->temp_begin; i < s->temp_end; i++) { 511 entry = applesmc_get_entry_by_index(i); 512 if (IS_ERR(entry)) 513 continue; 514 if (strcmp(entry->type, TEMP_SENSOR_TYPE)) 515 continue; 516 s->index[s->index_count++] = entry->key; 517 } 518 519 return 0; 520 } 521 522 /* 523 * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent. 524 */ 525 static int applesmc_init_smcreg_try(void) 526 { 527 struct applesmc_registers *s = &smcreg; 528 bool left_light_sensor = 0, right_light_sensor = 0; 529 unsigned int count; 530 u8 tmp[1]; 531 int ret; 532 533 if (s->init_complete) 534 return 0; 535 536 ret = read_register_count(&count); 537 if (ret) 538 return ret; 539 540 if (s->cache && s->key_count != count) { 541 pr_warn("key count changed from %d to %d\n", 542 s->key_count, count); 543 kfree(s->cache); 544 s->cache = NULL; 545 } 546 s->key_count = count; 547 548 if (!s->cache) 549 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL); 550 if (!s->cache) 551 return -ENOMEM; 552 553 ret = applesmc_read_key(FANS_COUNT, tmp, 1); 554 if (ret) 555 return ret; 556 s->fan_count = tmp[0]; 557 if (s->fan_count > 10) 558 s->fan_count = 10; 559 560 ret = applesmc_get_lower_bound(&s->temp_begin, "T"); 561 if (ret) 562 return ret; 563 ret = applesmc_get_lower_bound(&s->temp_end, "U"); 564 if (ret) 565 return ret; 566 s->temp_count = s->temp_end - s->temp_begin; 567 568 ret = applesmc_init_index(s); 569 if (ret) 570 return ret; 571 572 ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor); 573 if (ret) 574 return ret; 575 ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor); 576 if (ret) 577 return ret; 578 ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer); 579 if (ret) 580 return ret; 581 ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight); 582 if (ret) 583 return ret; 584 585 s->num_light_sensors = left_light_sensor + right_light_sensor; 586 s->init_complete = true; 587 588 pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n", 589 s->key_count, s->fan_count, s->temp_count, s->index_count, 590 s->has_accelerometer, 591 s->num_light_sensors, 592 s->has_key_backlight); 593 594 return 0; 595 } 596 597 static void applesmc_destroy_smcreg(void) 598 { 599 kfree(smcreg.index); 600 smcreg.index = NULL; 601 kfree(smcreg.cache); 602 smcreg.cache = NULL; 603 smcreg.init_complete = false; 604 } 605 606 /* 607 * applesmc_init_smcreg - Initialize register cache. 608 * 609 * Retries until initialization is successful, or the operation times out. 610 * 611 */ 612 static int applesmc_init_smcreg(void) 613 { 614 int ms, ret; 615 616 for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) { 617 ret = applesmc_init_smcreg_try(); 618 if (!ret) { 619 if (ms) 620 pr_info("init_smcreg() took %d ms\n", ms); 621 return 0; 622 } 623 msleep(INIT_WAIT_MSECS); 624 } 625 626 applesmc_destroy_smcreg(); 627 628 return ret; 629 } 630 631 /* Device model stuff */ 632 static int applesmc_probe(struct platform_device *dev) 633 { 634 int ret; 635 636 ret = applesmc_init_smcreg(); 637 if (ret) 638 return ret; 639 640 applesmc_device_init(); 641 642 return 0; 643 } 644 645 /* Synchronize device with memorized backlight state */ 646 static int applesmc_pm_resume(struct device *dev) 647 { 648 if (smcreg.has_key_backlight) 649 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2); 650 return 0; 651 } 652 653 /* Reinitialize device on resume from hibernation */ 654 static int applesmc_pm_restore(struct device *dev) 655 { 656 applesmc_device_init(); 657 return applesmc_pm_resume(dev); 658 } 659 660 static const struct dev_pm_ops applesmc_pm_ops = { 661 .resume = applesmc_pm_resume, 662 .restore = applesmc_pm_restore, 663 }; 664 665 static struct platform_driver applesmc_driver = { 666 .probe = applesmc_probe, 667 .driver = { 668 .name = "applesmc", 669 .pm = &applesmc_pm_ops, 670 }, 671 }; 672 673 /* 674 * applesmc_calibrate - Set our "resting" values. Callers must 675 * hold applesmc_lock. 676 */ 677 static void applesmc_calibrate(void) 678 { 679 applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x); 680 applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y); 681 rest_x = -rest_x; 682 } 683 684 static void applesmc_idev_poll(struct input_polled_dev *dev) 685 { 686 struct input_dev *idev = dev->input; 687 s16 x, y; 688 689 if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x)) 690 return; 691 if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y)) 692 return; 693 694 x = -x; 695 input_report_abs(idev, ABS_X, x - rest_x); 696 input_report_abs(idev, ABS_Y, y - rest_y); 697 input_sync(idev); 698 } 699 700 /* Sysfs Files */ 701 702 static ssize_t applesmc_name_show(struct device *dev, 703 struct device_attribute *attr, char *buf) 704 { 705 return snprintf(buf, PAGE_SIZE, "applesmc\n"); 706 } 707 708 static ssize_t applesmc_position_show(struct device *dev, 709 struct device_attribute *attr, char *buf) 710 { 711 int ret; 712 s16 x, y, z; 713 714 ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x); 715 if (ret) 716 goto out; 717 ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y); 718 if (ret) 719 goto out; 720 ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z); 721 if (ret) 722 goto out; 723 724 out: 725 if (ret) 726 return ret; 727 else 728 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z); 729 } 730 731 static ssize_t applesmc_light_show(struct device *dev, 732 struct device_attribute *attr, char *sysfsbuf) 733 { 734 const struct applesmc_entry *entry; 735 static int data_length; 736 int ret; 737 u8 left = 0, right = 0; 738 u8 buffer[10]; 739 740 if (!data_length) { 741 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY); 742 if (IS_ERR(entry)) 743 return PTR_ERR(entry); 744 if (entry->len > 10) 745 return -ENXIO; 746 data_length = entry->len; 747 pr_info("light sensor data length set to %d\n", data_length); 748 } 749 750 ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length); 751 /* newer macbooks report a single 10-bit bigendian value */ 752 if (data_length == 10) { 753 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2; 754 goto out; 755 } 756 left = buffer[2]; 757 if (ret) 758 goto out; 759 ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length); 760 right = buffer[2]; 761 762 out: 763 if (ret) 764 return ret; 765 else 766 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right); 767 } 768 769 /* Displays sensor key as label */ 770 static ssize_t applesmc_show_sensor_label(struct device *dev, 771 struct device_attribute *devattr, char *sysfsbuf) 772 { 773 const char *key = smcreg.index[to_index(devattr)]; 774 775 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key); 776 } 777 778 /* Displays degree Celsius * 1000 */ 779 static ssize_t applesmc_show_temperature(struct device *dev, 780 struct device_attribute *devattr, char *sysfsbuf) 781 { 782 const char *key = smcreg.index[to_index(devattr)]; 783 int ret; 784 s16 value; 785 int temp; 786 787 ret = applesmc_read_s16(key, &value); 788 if (ret) 789 return ret; 790 791 temp = 250 * (value >> 6); 792 793 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", temp); 794 } 795 796 static ssize_t applesmc_show_fan_speed(struct device *dev, 797 struct device_attribute *attr, char *sysfsbuf) 798 { 799 int ret; 800 unsigned int speed = 0; 801 char newkey[5]; 802 u8 buffer[2]; 803 804 scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)], 805 to_index(attr)); 806 807 ret = applesmc_read_key(newkey, buffer, 2); 808 speed = ((buffer[0] << 8 | buffer[1]) >> 2); 809 810 if (ret) 811 return ret; 812 else 813 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed); 814 } 815 816 static ssize_t applesmc_store_fan_speed(struct device *dev, 817 struct device_attribute *attr, 818 const char *sysfsbuf, size_t count) 819 { 820 int ret; 821 unsigned long speed; 822 char newkey[5]; 823 u8 buffer[2]; 824 825 if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000) 826 return -EINVAL; /* Bigger than a 14-bit value */ 827 828 scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)], 829 to_index(attr)); 830 831 buffer[0] = (speed >> 6) & 0xff; 832 buffer[1] = (speed << 2) & 0xff; 833 ret = applesmc_write_key(newkey, buffer, 2); 834 835 if (ret) 836 return ret; 837 else 838 return count; 839 } 840 841 static ssize_t applesmc_show_fan_manual(struct device *dev, 842 struct device_attribute *attr, char *sysfsbuf) 843 { 844 int ret; 845 u16 manual = 0; 846 u8 buffer[2]; 847 848 ret = applesmc_read_key(FANS_MANUAL, buffer, 2); 849 manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01; 850 851 if (ret) 852 return ret; 853 else 854 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual); 855 } 856 857 static ssize_t applesmc_store_fan_manual(struct device *dev, 858 struct device_attribute *attr, 859 const char *sysfsbuf, size_t count) 860 { 861 int ret; 862 u8 buffer[2]; 863 unsigned long input; 864 u16 val; 865 866 if (kstrtoul(sysfsbuf, 10, &input) < 0) 867 return -EINVAL; 868 869 ret = applesmc_read_key(FANS_MANUAL, buffer, 2); 870 val = (buffer[0] << 8 | buffer[1]); 871 if (ret) 872 goto out; 873 874 if (input) 875 val = val | (0x01 << to_index(attr)); 876 else 877 val = val & ~(0x01 << to_index(attr)); 878 879 buffer[0] = (val >> 8) & 0xFF; 880 buffer[1] = val & 0xFF; 881 882 ret = applesmc_write_key(FANS_MANUAL, buffer, 2); 883 884 out: 885 if (ret) 886 return ret; 887 else 888 return count; 889 } 890 891 static ssize_t applesmc_show_fan_position(struct device *dev, 892 struct device_attribute *attr, char *sysfsbuf) 893 { 894 int ret; 895 char newkey[5]; 896 u8 buffer[17]; 897 898 scnprintf(newkey, sizeof(newkey), FAN_ID_FMT, to_index(attr)); 899 900 ret = applesmc_read_key(newkey, buffer, 16); 901 buffer[16] = 0; 902 903 if (ret) 904 return ret; 905 else 906 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4); 907 } 908 909 static ssize_t applesmc_calibrate_show(struct device *dev, 910 struct device_attribute *attr, char *sysfsbuf) 911 { 912 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y); 913 } 914 915 static ssize_t applesmc_calibrate_store(struct device *dev, 916 struct device_attribute *attr, const char *sysfsbuf, size_t count) 917 { 918 applesmc_calibrate(); 919 920 return count; 921 } 922 923 static void applesmc_backlight_set(struct work_struct *work) 924 { 925 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2); 926 } 927 static DECLARE_WORK(backlight_work, &applesmc_backlight_set); 928 929 static void applesmc_brightness_set(struct led_classdev *led_cdev, 930 enum led_brightness value) 931 { 932 int ret; 933 934 backlight_state[0] = value; 935 ret = queue_work(applesmc_led_wq, &backlight_work); 936 937 if (debug && (!ret)) 938 dev_dbg(led_cdev->dev, "work was already on the queue.\n"); 939 } 940 941 static ssize_t applesmc_key_count_show(struct device *dev, 942 struct device_attribute *attr, char *sysfsbuf) 943 { 944 int ret; 945 u8 buffer[4]; 946 u32 count; 947 948 ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4); 949 count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) + 950 ((u32)buffer[2]<<8) + buffer[3]; 951 952 if (ret) 953 return ret; 954 else 955 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count); 956 } 957 958 static ssize_t applesmc_key_at_index_read_show(struct device *dev, 959 struct device_attribute *attr, char *sysfsbuf) 960 { 961 const struct applesmc_entry *entry; 962 int ret; 963 964 entry = applesmc_get_entry_by_index(key_at_index); 965 if (IS_ERR(entry)) 966 return PTR_ERR(entry); 967 ret = applesmc_read_entry(entry, sysfsbuf, entry->len); 968 if (ret) 969 return ret; 970 971 return entry->len; 972 } 973 974 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev, 975 struct device_attribute *attr, char *sysfsbuf) 976 { 977 const struct applesmc_entry *entry; 978 979 entry = applesmc_get_entry_by_index(key_at_index); 980 if (IS_ERR(entry)) 981 return PTR_ERR(entry); 982 983 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len); 984 } 985 986 static ssize_t applesmc_key_at_index_type_show(struct device *dev, 987 struct device_attribute *attr, char *sysfsbuf) 988 { 989 const struct applesmc_entry *entry; 990 991 entry = applesmc_get_entry_by_index(key_at_index); 992 if (IS_ERR(entry)) 993 return PTR_ERR(entry); 994 995 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type); 996 } 997 998 static ssize_t applesmc_key_at_index_name_show(struct device *dev, 999 struct device_attribute *attr, char *sysfsbuf) 1000 { 1001 const struct applesmc_entry *entry; 1002 1003 entry = applesmc_get_entry_by_index(key_at_index); 1004 if (IS_ERR(entry)) 1005 return PTR_ERR(entry); 1006 1007 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key); 1008 } 1009 1010 static ssize_t applesmc_key_at_index_show(struct device *dev, 1011 struct device_attribute *attr, char *sysfsbuf) 1012 { 1013 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index); 1014 } 1015 1016 static ssize_t applesmc_key_at_index_store(struct device *dev, 1017 struct device_attribute *attr, const char *sysfsbuf, size_t count) 1018 { 1019 unsigned long newkey; 1020 1021 if (kstrtoul(sysfsbuf, 10, &newkey) < 0 1022 || newkey >= smcreg.key_count) 1023 return -EINVAL; 1024 1025 key_at_index = newkey; 1026 return count; 1027 } 1028 1029 static struct led_classdev applesmc_backlight = { 1030 .name = "smc::kbd_backlight", 1031 .default_trigger = "nand-disk", 1032 .brightness_set = applesmc_brightness_set, 1033 }; 1034 1035 static struct applesmc_node_group info_group[] = { 1036 { "name", applesmc_name_show }, 1037 { "key_count", applesmc_key_count_show }, 1038 { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store }, 1039 { "key_at_index_name", applesmc_key_at_index_name_show }, 1040 { "key_at_index_type", applesmc_key_at_index_type_show }, 1041 { "key_at_index_data_length", applesmc_key_at_index_data_length_show }, 1042 { "key_at_index_data", applesmc_key_at_index_read_show }, 1043 { } 1044 }; 1045 1046 static struct applesmc_node_group accelerometer_group[] = { 1047 { "position", applesmc_position_show }, 1048 { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store }, 1049 { } 1050 }; 1051 1052 static struct applesmc_node_group light_sensor_group[] = { 1053 { "light", applesmc_light_show }, 1054 { } 1055 }; 1056 1057 static struct applesmc_node_group fan_group[] = { 1058 { "fan%d_label", applesmc_show_fan_position }, 1059 { "fan%d_input", applesmc_show_fan_speed, NULL, 0 }, 1060 { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 }, 1061 { "fan%d_max", applesmc_show_fan_speed, NULL, 2 }, 1062 { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 }, 1063 { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 }, 1064 { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual }, 1065 { } 1066 }; 1067 1068 static struct applesmc_node_group temp_group[] = { 1069 { "temp%d_label", applesmc_show_sensor_label }, 1070 { "temp%d_input", applesmc_show_temperature }, 1071 { } 1072 }; 1073 1074 /* Module stuff */ 1075 1076 /* 1077 * applesmc_destroy_nodes - remove files and free associated memory 1078 */ 1079 static void applesmc_destroy_nodes(struct applesmc_node_group *groups) 1080 { 1081 struct applesmc_node_group *grp; 1082 struct applesmc_dev_attr *node; 1083 1084 for (grp = groups; grp->nodes; grp++) { 1085 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++) 1086 sysfs_remove_file(&pdev->dev.kobj, 1087 &node->sda.dev_attr.attr); 1088 kfree(grp->nodes); 1089 grp->nodes = NULL; 1090 } 1091 } 1092 1093 /* 1094 * applesmc_create_nodes - create a two-dimensional group of sysfs files 1095 */ 1096 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num) 1097 { 1098 struct applesmc_node_group *grp; 1099 struct applesmc_dev_attr *node; 1100 struct attribute *attr; 1101 int ret, i; 1102 1103 for (grp = groups; grp->format; grp++) { 1104 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL); 1105 if (!grp->nodes) { 1106 ret = -ENOMEM; 1107 goto out; 1108 } 1109 for (i = 0; i < num; i++) { 1110 node = &grp->nodes[i]; 1111 scnprintf(node->name, sizeof(node->name), grp->format, 1112 i + 1); 1113 node->sda.index = (grp->option << 16) | (i & 0xffff); 1114 node->sda.dev_attr.show = grp->show; 1115 node->sda.dev_attr.store = grp->store; 1116 attr = &node->sda.dev_attr.attr; 1117 sysfs_attr_init(attr); 1118 attr->name = node->name; 1119 attr->mode = 0444 | (grp->store ? 0200 : 0); 1120 ret = sysfs_create_file(&pdev->dev.kobj, attr); 1121 if (ret) { 1122 attr->name = NULL; 1123 goto out; 1124 } 1125 } 1126 } 1127 1128 return 0; 1129 out: 1130 applesmc_destroy_nodes(groups); 1131 return ret; 1132 } 1133 1134 /* Create accelerometer resources */ 1135 static int applesmc_create_accelerometer(void) 1136 { 1137 struct input_dev *idev; 1138 int ret; 1139 1140 if (!smcreg.has_accelerometer) 1141 return 0; 1142 1143 ret = applesmc_create_nodes(accelerometer_group, 1); 1144 if (ret) 1145 goto out; 1146 1147 applesmc_idev = input_allocate_polled_device(); 1148 if (!applesmc_idev) { 1149 ret = -ENOMEM; 1150 goto out_sysfs; 1151 } 1152 1153 applesmc_idev->poll = applesmc_idev_poll; 1154 applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL; 1155 1156 /* initial calibrate for the input device */ 1157 applesmc_calibrate(); 1158 1159 /* initialize the input device */ 1160 idev = applesmc_idev->input; 1161 idev->name = "applesmc"; 1162 idev->id.bustype = BUS_HOST; 1163 idev->dev.parent = &pdev->dev; 1164 idev->evbit[0] = BIT_MASK(EV_ABS); 1165 input_set_abs_params(idev, ABS_X, 1166 -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT); 1167 input_set_abs_params(idev, ABS_Y, 1168 -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT); 1169 1170 ret = input_register_polled_device(applesmc_idev); 1171 if (ret) 1172 goto out_idev; 1173 1174 return 0; 1175 1176 out_idev: 1177 input_free_polled_device(applesmc_idev); 1178 1179 out_sysfs: 1180 applesmc_destroy_nodes(accelerometer_group); 1181 1182 out: 1183 pr_warn("driver init failed (ret=%d)!\n", ret); 1184 return ret; 1185 } 1186 1187 /* Release all resources used by the accelerometer */ 1188 static void applesmc_release_accelerometer(void) 1189 { 1190 if (!smcreg.has_accelerometer) 1191 return; 1192 input_unregister_polled_device(applesmc_idev); 1193 input_free_polled_device(applesmc_idev); 1194 applesmc_destroy_nodes(accelerometer_group); 1195 } 1196 1197 static int applesmc_create_light_sensor(void) 1198 { 1199 if (!smcreg.num_light_sensors) 1200 return 0; 1201 return applesmc_create_nodes(light_sensor_group, 1); 1202 } 1203 1204 static void applesmc_release_light_sensor(void) 1205 { 1206 if (!smcreg.num_light_sensors) 1207 return; 1208 applesmc_destroy_nodes(light_sensor_group); 1209 } 1210 1211 static int applesmc_create_key_backlight(void) 1212 { 1213 if (!smcreg.has_key_backlight) 1214 return 0; 1215 applesmc_led_wq = create_singlethread_workqueue("applesmc-led"); 1216 if (!applesmc_led_wq) 1217 return -ENOMEM; 1218 return led_classdev_register(&pdev->dev, &applesmc_backlight); 1219 } 1220 1221 static void applesmc_release_key_backlight(void) 1222 { 1223 if (!smcreg.has_key_backlight) 1224 return; 1225 led_classdev_unregister(&applesmc_backlight); 1226 destroy_workqueue(applesmc_led_wq); 1227 } 1228 1229 static int applesmc_dmi_match(const struct dmi_system_id *id) 1230 { 1231 return 1; 1232 } 1233 1234 /* 1235 * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1". 1236 * So we need to put "Apple MacBook Pro" before "Apple MacBook". 1237 */ 1238 static const struct dmi_system_id applesmc_whitelist[] __initconst = { 1239 { applesmc_dmi_match, "Apple MacBook Air", { 1240 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1241 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") }, 1242 }, 1243 { applesmc_dmi_match, "Apple MacBook Pro", { 1244 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1245 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") }, 1246 }, 1247 { applesmc_dmi_match, "Apple MacBook", { 1248 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1249 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") }, 1250 }, 1251 { applesmc_dmi_match, "Apple Macmini", { 1252 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1253 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") }, 1254 }, 1255 { applesmc_dmi_match, "Apple MacPro", { 1256 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1257 DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") }, 1258 }, 1259 { applesmc_dmi_match, "Apple iMac", { 1260 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1261 DMI_MATCH(DMI_PRODUCT_NAME, "iMac") }, 1262 }, 1263 { .ident = NULL } 1264 }; 1265 1266 static int __init applesmc_init(void) 1267 { 1268 int ret; 1269 1270 if (!dmi_check_system(applesmc_whitelist)) { 1271 pr_warn("supported laptop not found!\n"); 1272 ret = -ENODEV; 1273 goto out; 1274 } 1275 1276 if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS, 1277 "applesmc")) { 1278 ret = -ENXIO; 1279 goto out; 1280 } 1281 1282 ret = platform_driver_register(&applesmc_driver); 1283 if (ret) 1284 goto out_region; 1285 1286 pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT, 1287 NULL, 0); 1288 if (IS_ERR(pdev)) { 1289 ret = PTR_ERR(pdev); 1290 goto out_driver; 1291 } 1292 1293 /* create register cache */ 1294 ret = applesmc_init_smcreg(); 1295 if (ret) 1296 goto out_device; 1297 1298 ret = applesmc_create_nodes(info_group, 1); 1299 if (ret) 1300 goto out_smcreg; 1301 1302 ret = applesmc_create_nodes(fan_group, smcreg.fan_count); 1303 if (ret) 1304 goto out_info; 1305 1306 ret = applesmc_create_nodes(temp_group, smcreg.index_count); 1307 if (ret) 1308 goto out_fans; 1309 1310 ret = applesmc_create_accelerometer(); 1311 if (ret) 1312 goto out_temperature; 1313 1314 ret = applesmc_create_light_sensor(); 1315 if (ret) 1316 goto out_accelerometer; 1317 1318 ret = applesmc_create_key_backlight(); 1319 if (ret) 1320 goto out_light_sysfs; 1321 1322 hwmon_dev = hwmon_device_register(&pdev->dev); 1323 if (IS_ERR(hwmon_dev)) { 1324 ret = PTR_ERR(hwmon_dev); 1325 goto out_light_ledclass; 1326 } 1327 1328 return 0; 1329 1330 out_light_ledclass: 1331 applesmc_release_key_backlight(); 1332 out_light_sysfs: 1333 applesmc_release_light_sensor(); 1334 out_accelerometer: 1335 applesmc_release_accelerometer(); 1336 out_temperature: 1337 applesmc_destroy_nodes(temp_group); 1338 out_fans: 1339 applesmc_destroy_nodes(fan_group); 1340 out_info: 1341 applesmc_destroy_nodes(info_group); 1342 out_smcreg: 1343 applesmc_destroy_smcreg(); 1344 out_device: 1345 platform_device_unregister(pdev); 1346 out_driver: 1347 platform_driver_unregister(&applesmc_driver); 1348 out_region: 1349 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS); 1350 out: 1351 pr_warn("driver init failed (ret=%d)!\n", ret); 1352 return ret; 1353 } 1354 1355 static void __exit applesmc_exit(void) 1356 { 1357 hwmon_device_unregister(hwmon_dev); 1358 applesmc_release_key_backlight(); 1359 applesmc_release_light_sensor(); 1360 applesmc_release_accelerometer(); 1361 applesmc_destroy_nodes(temp_group); 1362 applesmc_destroy_nodes(fan_group); 1363 applesmc_destroy_nodes(info_group); 1364 applesmc_destroy_smcreg(); 1365 platform_device_unregister(pdev); 1366 platform_driver_unregister(&applesmc_driver); 1367 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS); 1368 } 1369 1370 module_init(applesmc_init); 1371 module_exit(applesmc_exit); 1372 1373 MODULE_AUTHOR("Nicolas Boichat"); 1374 MODULE_DESCRIPTION("Apple SMC"); 1375 MODULE_LICENSE("GPL v2"); 1376 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist); 1377