1 /* 2 * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature 3 * sensors, fan control, keyboard backlight control) used in Intel-based Apple 4 * computers. 5 * 6 * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch> 7 * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se> 8 * 9 * Based on hdaps.c driver: 10 * Copyright (C) 2005 Robert Love <rml@novell.com> 11 * Copyright (C) 2005 Jesper Juhl <jesper.juhl@gmail.com> 12 * 13 * Fan control based on smcFanControl: 14 * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com> 15 * 16 * This program is free software; you can redistribute it and/or modify it 17 * under the terms of the GNU General Public License v2 as published by the 18 * Free Software Foundation. 19 * 20 * This program is distributed in the hope that it will be useful, but WITHOUT 21 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 22 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 23 * more details. 24 * 25 * You should have received a copy of the GNU General Public License along with 26 * this program; if not, write to the Free Software Foundation, Inc., 27 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 28 */ 29 30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 31 32 #include <linux/delay.h> 33 #include <linux/platform_device.h> 34 #include <linux/input-polldev.h> 35 #include <linux/kernel.h> 36 #include <linux/slab.h> 37 #include <linux/module.h> 38 #include <linux/timer.h> 39 #include <linux/dmi.h> 40 #include <linux/mutex.h> 41 #include <linux/hwmon-sysfs.h> 42 #include <linux/io.h> 43 #include <linux/leds.h> 44 #include <linux/hwmon.h> 45 #include <linux/workqueue.h> 46 47 /* data port used by Apple SMC */ 48 #define APPLESMC_DATA_PORT 0x300 49 /* command/status port used by Apple SMC */ 50 #define APPLESMC_CMD_PORT 0x304 51 52 #define APPLESMC_NR_PORTS 32 /* 0x300-0x31f */ 53 54 #define APPLESMC_MAX_DATA_LENGTH 32 55 56 /* wait up to 32 ms for a status change. */ 57 #define APPLESMC_MIN_WAIT 0x0040 58 #define APPLESMC_MAX_WAIT 0x8000 59 60 #define APPLESMC_STATUS_MASK 0x0f 61 #define APPLESMC_READ_CMD 0x10 62 #define APPLESMC_WRITE_CMD 0x11 63 #define APPLESMC_GET_KEY_BY_INDEX_CMD 0x12 64 #define APPLESMC_GET_KEY_TYPE_CMD 0x13 65 66 #define KEY_COUNT_KEY "#KEY" /* r-o ui32 */ 67 68 #define LIGHT_SENSOR_LEFT_KEY "ALV0" /* r-o {alv (6-10 bytes) */ 69 #define LIGHT_SENSOR_RIGHT_KEY "ALV1" /* r-o {alv (6-10 bytes) */ 70 #define BACKLIGHT_KEY "LKSB" /* w-o {lkb (2 bytes) */ 71 72 #define CLAMSHELL_KEY "MSLD" /* r-o ui8 (unused) */ 73 74 #define MOTION_SENSOR_X_KEY "MO_X" /* r-o sp78 (2 bytes) */ 75 #define MOTION_SENSOR_Y_KEY "MO_Y" /* r-o sp78 (2 bytes) */ 76 #define MOTION_SENSOR_Z_KEY "MO_Z" /* r-o sp78 (2 bytes) */ 77 #define MOTION_SENSOR_KEY "MOCN" /* r/w ui16 */ 78 79 #define FANS_COUNT "FNum" /* r-o ui8 */ 80 #define FANS_MANUAL "FS! " /* r-w ui16 */ 81 #define FAN_ID_FMT "F%dID" /* r-o char[16] */ 82 83 /* List of keys used to read/write fan speeds */ 84 static const char *const fan_speed_fmt[] = { 85 "F%dAc", /* actual speed */ 86 "F%dMn", /* minimum speed (rw) */ 87 "F%dMx", /* maximum speed */ 88 "F%dSf", /* safe speed - not all models */ 89 "F%dTg", /* target speed (manual: rw) */ 90 }; 91 92 #define INIT_TIMEOUT_MSECS 5000 /* wait up to 5s for device init ... */ 93 #define INIT_WAIT_MSECS 50 /* ... in 50ms increments */ 94 95 #define APPLESMC_POLL_INTERVAL 50 /* msecs */ 96 #define APPLESMC_INPUT_FUZZ 4 /* input event threshold */ 97 #define APPLESMC_INPUT_FLAT 4 98 99 #define SENSOR_X 0 100 #define SENSOR_Y 1 101 #define SENSOR_Z 2 102 103 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff) 104 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16) 105 106 /* Dynamic device node attributes */ 107 struct applesmc_dev_attr { 108 struct sensor_device_attribute sda; /* hwmon attributes */ 109 char name[32]; /* room for node file name */ 110 }; 111 112 /* Dynamic device node group */ 113 struct applesmc_node_group { 114 char *format; /* format string */ 115 void *show; /* show function */ 116 void *store; /* store function */ 117 int option; /* function argument */ 118 struct applesmc_dev_attr *nodes; /* dynamic node array */ 119 }; 120 121 /* AppleSMC entry - cached register information */ 122 struct applesmc_entry { 123 char key[5]; /* four-letter key code */ 124 u8 valid; /* set when entry is successfully read once */ 125 u8 len; /* bounded by APPLESMC_MAX_DATA_LENGTH */ 126 char type[5]; /* four-letter type code */ 127 u8 flags; /* 0x10: func; 0x40: write; 0x80: read */ 128 }; 129 130 /* Register lookup and registers common to all SMCs */ 131 static struct applesmc_registers { 132 struct mutex mutex; /* register read/write mutex */ 133 unsigned int key_count; /* number of SMC registers */ 134 unsigned int fan_count; /* number of fans */ 135 unsigned int temp_count; /* number of temperature registers */ 136 unsigned int temp_begin; /* temperature lower index bound */ 137 unsigned int temp_end; /* temperature upper index bound */ 138 int num_light_sensors; /* number of light sensors */ 139 bool has_accelerometer; /* has motion sensor */ 140 bool has_key_backlight; /* has keyboard backlight */ 141 bool init_complete; /* true when fully initialized */ 142 struct applesmc_entry *cache; /* cached key entries */ 143 } smcreg = { 144 .mutex = __MUTEX_INITIALIZER(smcreg.mutex), 145 }; 146 147 static const int debug; 148 static struct platform_device *pdev; 149 static s16 rest_x; 150 static s16 rest_y; 151 static u8 backlight_state[2]; 152 153 static struct device *hwmon_dev; 154 static struct input_polled_dev *applesmc_idev; 155 156 /* 157 * Last index written to key_at_index sysfs file, and value to use for all other 158 * key_at_index_* sysfs files. 159 */ 160 static unsigned int key_at_index; 161 162 static struct workqueue_struct *applesmc_led_wq; 163 164 /* 165 * __wait_status - Wait up to 32ms for the status port to get a certain value 166 * (masked with 0x0f), returning zero if the value is obtained. Callers must 167 * hold applesmc_lock. 168 */ 169 static int __wait_status(u8 val) 170 { 171 int us; 172 173 val = val & APPLESMC_STATUS_MASK; 174 175 for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) { 176 udelay(us); 177 if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == val) 178 return 0; 179 } 180 181 return -EIO; 182 } 183 184 /* 185 * special treatment of command port - on newer macbooks, it seems necessary 186 * to resend the command byte before polling the status again. Callers must 187 * hold applesmc_lock. 188 */ 189 static int send_command(u8 cmd) 190 { 191 int us; 192 for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) { 193 outb(cmd, APPLESMC_CMD_PORT); 194 udelay(us); 195 if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == 0x0c) 196 return 0; 197 } 198 return -EIO; 199 } 200 201 static int send_argument(const char *key) 202 { 203 int i; 204 205 for (i = 0; i < 4; i++) { 206 outb(key[i], APPLESMC_DATA_PORT); 207 if (__wait_status(0x04)) 208 return -EIO; 209 } 210 return 0; 211 } 212 213 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len) 214 { 215 int i; 216 217 if (send_command(cmd) || send_argument(key)) { 218 pr_warn("%s: read arg fail\n", key); 219 return -EIO; 220 } 221 222 outb(len, APPLESMC_DATA_PORT); 223 224 for (i = 0; i < len; i++) { 225 if (__wait_status(0x05)) { 226 pr_warn("%s: read data fail\n", key); 227 return -EIO; 228 } 229 buffer[i] = inb(APPLESMC_DATA_PORT); 230 } 231 232 return 0; 233 } 234 235 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len) 236 { 237 int i; 238 239 if (send_command(cmd) || send_argument(key)) { 240 pr_warn("%s: write arg fail\n", key); 241 return -EIO; 242 } 243 244 outb(len, APPLESMC_DATA_PORT); 245 246 for (i = 0; i < len; i++) { 247 if (__wait_status(0x04)) { 248 pr_warn("%s: write data fail\n", key); 249 return -EIO; 250 } 251 outb(buffer[i], APPLESMC_DATA_PORT); 252 } 253 254 return 0; 255 } 256 257 static int read_register_count(unsigned int *count) 258 { 259 __be32 be; 260 int ret; 261 262 ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4); 263 if (ret) 264 return ret; 265 266 *count = be32_to_cpu(be); 267 return 0; 268 } 269 270 /* 271 * Serialized I/O 272 * 273 * Returns zero on success or a negative error on failure. 274 * All functions below are concurrency safe - callers should NOT hold lock. 275 */ 276 277 static int applesmc_read_entry(const struct applesmc_entry *entry, 278 u8 *buf, u8 len) 279 { 280 int ret; 281 282 if (entry->len != len) 283 return -EINVAL; 284 mutex_lock(&smcreg.mutex); 285 ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len); 286 mutex_unlock(&smcreg.mutex); 287 288 return ret; 289 } 290 291 static int applesmc_write_entry(const struct applesmc_entry *entry, 292 const u8 *buf, u8 len) 293 { 294 int ret; 295 296 if (entry->len != len) 297 return -EINVAL; 298 mutex_lock(&smcreg.mutex); 299 ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len); 300 mutex_unlock(&smcreg.mutex); 301 return ret; 302 } 303 304 static const struct applesmc_entry *applesmc_get_entry_by_index(int index) 305 { 306 struct applesmc_entry *cache = &smcreg.cache[index]; 307 u8 key[4], info[6]; 308 __be32 be; 309 int ret = 0; 310 311 if (cache->valid) 312 return cache; 313 314 mutex_lock(&smcreg.mutex); 315 316 if (cache->valid) 317 goto out; 318 be = cpu_to_be32(index); 319 ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4); 320 if (ret) 321 goto out; 322 ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6); 323 if (ret) 324 goto out; 325 326 memcpy(cache->key, key, 4); 327 cache->len = info[0]; 328 memcpy(cache->type, &info[1], 4); 329 cache->flags = info[5]; 330 cache->valid = 1; 331 332 out: 333 mutex_unlock(&smcreg.mutex); 334 if (ret) 335 return ERR_PTR(ret); 336 return cache; 337 } 338 339 static int applesmc_get_lower_bound(unsigned int *lo, const char *key) 340 { 341 int begin = 0, end = smcreg.key_count; 342 const struct applesmc_entry *entry; 343 344 while (begin != end) { 345 int middle = begin + (end - begin) / 2; 346 entry = applesmc_get_entry_by_index(middle); 347 if (IS_ERR(entry)) 348 return PTR_ERR(entry); 349 if (strcmp(entry->key, key) < 0) 350 begin = middle + 1; 351 else 352 end = middle; 353 } 354 355 *lo = begin; 356 return 0; 357 } 358 359 static int applesmc_get_upper_bound(unsigned int *hi, const char *key) 360 { 361 int begin = 0, end = smcreg.key_count; 362 const struct applesmc_entry *entry; 363 364 while (begin != end) { 365 int middle = begin + (end - begin) / 2; 366 entry = applesmc_get_entry_by_index(middle); 367 if (IS_ERR(entry)) 368 return PTR_ERR(entry); 369 if (strcmp(key, entry->key) < 0) 370 end = middle; 371 else 372 begin = middle + 1; 373 } 374 375 *hi = begin; 376 return 0; 377 } 378 379 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key) 380 { 381 int begin, end; 382 int ret; 383 384 ret = applesmc_get_lower_bound(&begin, key); 385 if (ret) 386 return ERR_PTR(ret); 387 ret = applesmc_get_upper_bound(&end, key); 388 if (ret) 389 return ERR_PTR(ret); 390 if (end - begin != 1) 391 return ERR_PTR(-EINVAL); 392 393 return applesmc_get_entry_by_index(begin); 394 } 395 396 static int applesmc_read_key(const char *key, u8 *buffer, u8 len) 397 { 398 const struct applesmc_entry *entry; 399 400 entry = applesmc_get_entry_by_key(key); 401 if (IS_ERR(entry)) 402 return PTR_ERR(entry); 403 404 return applesmc_read_entry(entry, buffer, len); 405 } 406 407 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len) 408 { 409 const struct applesmc_entry *entry; 410 411 entry = applesmc_get_entry_by_key(key); 412 if (IS_ERR(entry)) 413 return PTR_ERR(entry); 414 415 return applesmc_write_entry(entry, buffer, len); 416 } 417 418 static int applesmc_has_key(const char *key, bool *value) 419 { 420 const struct applesmc_entry *entry; 421 422 entry = applesmc_get_entry_by_key(key); 423 if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL) 424 return PTR_ERR(entry); 425 426 *value = !IS_ERR(entry); 427 return 0; 428 } 429 430 /* 431 * applesmc_read_motion_sensor - Read motion sensor (X, Y or Z). 432 */ 433 static int applesmc_read_motion_sensor(int index, s16 *value) 434 { 435 u8 buffer[2]; 436 int ret; 437 438 switch (index) { 439 case SENSOR_X: 440 ret = applesmc_read_key(MOTION_SENSOR_X_KEY, buffer, 2); 441 break; 442 case SENSOR_Y: 443 ret = applesmc_read_key(MOTION_SENSOR_Y_KEY, buffer, 2); 444 break; 445 case SENSOR_Z: 446 ret = applesmc_read_key(MOTION_SENSOR_Z_KEY, buffer, 2); 447 break; 448 default: 449 ret = -EINVAL; 450 } 451 452 *value = ((s16)buffer[0] << 8) | buffer[1]; 453 454 return ret; 455 } 456 457 /* 458 * applesmc_device_init - initialize the accelerometer. Can sleep. 459 */ 460 static void applesmc_device_init(void) 461 { 462 int total; 463 u8 buffer[2]; 464 465 if (!smcreg.has_accelerometer) 466 return; 467 468 for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) { 469 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) && 470 (buffer[0] != 0x00 || buffer[1] != 0x00)) 471 return; 472 buffer[0] = 0xe0; 473 buffer[1] = 0x00; 474 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2); 475 msleep(INIT_WAIT_MSECS); 476 } 477 478 pr_warn("failed to init the device\n"); 479 } 480 481 /* 482 * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent. 483 */ 484 static int applesmc_init_smcreg_try(void) 485 { 486 struct applesmc_registers *s = &smcreg; 487 bool left_light_sensor, right_light_sensor; 488 u8 tmp[1]; 489 int ret; 490 491 if (s->init_complete) 492 return 0; 493 494 ret = read_register_count(&s->key_count); 495 if (ret) 496 return ret; 497 498 if (!s->cache) 499 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL); 500 if (!s->cache) 501 return -ENOMEM; 502 503 ret = applesmc_read_key(FANS_COUNT, tmp, 1); 504 if (ret) 505 return ret; 506 s->fan_count = tmp[0]; 507 508 ret = applesmc_get_lower_bound(&s->temp_begin, "T"); 509 if (ret) 510 return ret; 511 ret = applesmc_get_lower_bound(&s->temp_end, "U"); 512 if (ret) 513 return ret; 514 s->temp_count = s->temp_end - s->temp_begin; 515 516 ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor); 517 if (ret) 518 return ret; 519 ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor); 520 if (ret) 521 return ret; 522 ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer); 523 if (ret) 524 return ret; 525 ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight); 526 if (ret) 527 return ret; 528 529 s->num_light_sensors = left_light_sensor + right_light_sensor; 530 s->init_complete = true; 531 532 pr_info("key=%d fan=%d temp=%d acc=%d lux=%d kbd=%d\n", 533 s->key_count, s->fan_count, s->temp_count, 534 s->has_accelerometer, 535 s->num_light_sensors, 536 s->has_key_backlight); 537 538 return 0; 539 } 540 541 /* 542 * applesmc_init_smcreg - Initialize register cache. 543 * 544 * Retries until initialization is successful, or the operation times out. 545 * 546 */ 547 static int applesmc_init_smcreg(void) 548 { 549 int ms, ret; 550 551 for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) { 552 ret = applesmc_init_smcreg_try(); 553 if (!ret) { 554 if (ms) 555 pr_info("init_smcreg() took %d ms\n", ms); 556 return 0; 557 } 558 msleep(INIT_WAIT_MSECS); 559 } 560 561 kfree(smcreg.cache); 562 smcreg.cache = NULL; 563 564 return ret; 565 } 566 567 static void applesmc_destroy_smcreg(void) 568 { 569 kfree(smcreg.cache); 570 smcreg.cache = NULL; 571 smcreg.init_complete = false; 572 } 573 574 /* Device model stuff */ 575 static int applesmc_probe(struct platform_device *dev) 576 { 577 int ret; 578 579 ret = applesmc_init_smcreg(); 580 if (ret) 581 return ret; 582 583 applesmc_device_init(); 584 585 return 0; 586 } 587 588 /* Synchronize device with memorized backlight state */ 589 static int applesmc_pm_resume(struct device *dev) 590 { 591 if (smcreg.has_key_backlight) 592 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2); 593 return 0; 594 } 595 596 /* Reinitialize device on resume from hibernation */ 597 static int applesmc_pm_restore(struct device *dev) 598 { 599 applesmc_device_init(); 600 return applesmc_pm_resume(dev); 601 } 602 603 static const struct dev_pm_ops applesmc_pm_ops = { 604 .resume = applesmc_pm_resume, 605 .restore = applesmc_pm_restore, 606 }; 607 608 static struct platform_driver applesmc_driver = { 609 .probe = applesmc_probe, 610 .driver = { 611 .name = "applesmc", 612 .owner = THIS_MODULE, 613 .pm = &applesmc_pm_ops, 614 }, 615 }; 616 617 /* 618 * applesmc_calibrate - Set our "resting" values. Callers must 619 * hold applesmc_lock. 620 */ 621 static void applesmc_calibrate(void) 622 { 623 applesmc_read_motion_sensor(SENSOR_X, &rest_x); 624 applesmc_read_motion_sensor(SENSOR_Y, &rest_y); 625 rest_x = -rest_x; 626 } 627 628 static void applesmc_idev_poll(struct input_polled_dev *dev) 629 { 630 struct input_dev *idev = dev->input; 631 s16 x, y; 632 633 if (applesmc_read_motion_sensor(SENSOR_X, &x)) 634 return; 635 if (applesmc_read_motion_sensor(SENSOR_Y, &y)) 636 return; 637 638 x = -x; 639 input_report_abs(idev, ABS_X, x - rest_x); 640 input_report_abs(idev, ABS_Y, y - rest_y); 641 input_sync(idev); 642 } 643 644 /* Sysfs Files */ 645 646 static ssize_t applesmc_name_show(struct device *dev, 647 struct device_attribute *attr, char *buf) 648 { 649 return snprintf(buf, PAGE_SIZE, "applesmc\n"); 650 } 651 652 static ssize_t applesmc_position_show(struct device *dev, 653 struct device_attribute *attr, char *buf) 654 { 655 int ret; 656 s16 x, y, z; 657 658 ret = applesmc_read_motion_sensor(SENSOR_X, &x); 659 if (ret) 660 goto out; 661 ret = applesmc_read_motion_sensor(SENSOR_Y, &y); 662 if (ret) 663 goto out; 664 ret = applesmc_read_motion_sensor(SENSOR_Z, &z); 665 if (ret) 666 goto out; 667 668 out: 669 if (ret) 670 return ret; 671 else 672 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z); 673 } 674 675 static ssize_t applesmc_light_show(struct device *dev, 676 struct device_attribute *attr, char *sysfsbuf) 677 { 678 const struct applesmc_entry *entry; 679 static int data_length; 680 int ret; 681 u8 left = 0, right = 0; 682 u8 buffer[10]; 683 684 if (!data_length) { 685 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY); 686 if (IS_ERR(entry)) 687 return PTR_ERR(entry); 688 if (entry->len > 10) 689 return -ENXIO; 690 data_length = entry->len; 691 pr_info("light sensor data length set to %d\n", data_length); 692 } 693 694 ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length); 695 /* newer macbooks report a single 10-bit bigendian value */ 696 if (data_length == 10) { 697 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2; 698 goto out; 699 } 700 left = buffer[2]; 701 if (ret) 702 goto out; 703 ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length); 704 right = buffer[2]; 705 706 out: 707 if (ret) 708 return ret; 709 else 710 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right); 711 } 712 713 /* Displays sensor key as label */ 714 static ssize_t applesmc_show_sensor_label(struct device *dev, 715 struct device_attribute *devattr, char *sysfsbuf) 716 { 717 int index = smcreg.temp_begin + to_index(devattr); 718 const struct applesmc_entry *entry; 719 720 entry = applesmc_get_entry_by_index(index); 721 if (IS_ERR(entry)) 722 return PTR_ERR(entry); 723 724 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key); 725 } 726 727 /* Displays degree Celsius * 1000 */ 728 static ssize_t applesmc_show_temperature(struct device *dev, 729 struct device_attribute *devattr, char *sysfsbuf) 730 { 731 int index = smcreg.temp_begin + to_index(devattr); 732 const struct applesmc_entry *entry; 733 int ret; 734 u8 buffer[2]; 735 unsigned int temp; 736 737 entry = applesmc_get_entry_by_index(index); 738 if (IS_ERR(entry)) 739 return PTR_ERR(entry); 740 if (entry->len > 2) 741 return -EINVAL; 742 743 ret = applesmc_read_entry(entry, buffer, entry->len); 744 if (ret) 745 return ret; 746 747 if (entry->len == 2) { 748 temp = buffer[0] * 1000; 749 temp += (buffer[1] >> 6) * 250; 750 } else { 751 temp = buffer[0] * 4000; 752 } 753 754 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", temp); 755 } 756 757 static ssize_t applesmc_show_fan_speed(struct device *dev, 758 struct device_attribute *attr, char *sysfsbuf) 759 { 760 int ret; 761 unsigned int speed = 0; 762 char newkey[5]; 763 u8 buffer[2]; 764 765 sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr)); 766 767 ret = applesmc_read_key(newkey, buffer, 2); 768 speed = ((buffer[0] << 8 | buffer[1]) >> 2); 769 770 if (ret) 771 return ret; 772 else 773 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed); 774 } 775 776 static ssize_t applesmc_store_fan_speed(struct device *dev, 777 struct device_attribute *attr, 778 const char *sysfsbuf, size_t count) 779 { 780 int ret; 781 unsigned long speed; 782 char newkey[5]; 783 u8 buffer[2]; 784 785 if (strict_strtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000) 786 return -EINVAL; /* Bigger than a 14-bit value */ 787 788 sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr)); 789 790 buffer[0] = (speed >> 6) & 0xff; 791 buffer[1] = (speed << 2) & 0xff; 792 ret = applesmc_write_key(newkey, buffer, 2); 793 794 if (ret) 795 return ret; 796 else 797 return count; 798 } 799 800 static ssize_t applesmc_show_fan_manual(struct device *dev, 801 struct device_attribute *attr, char *sysfsbuf) 802 { 803 int ret; 804 u16 manual = 0; 805 u8 buffer[2]; 806 807 ret = applesmc_read_key(FANS_MANUAL, buffer, 2); 808 manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01; 809 810 if (ret) 811 return ret; 812 else 813 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual); 814 } 815 816 static ssize_t applesmc_store_fan_manual(struct device *dev, 817 struct device_attribute *attr, 818 const char *sysfsbuf, size_t count) 819 { 820 int ret; 821 u8 buffer[2]; 822 unsigned long input; 823 u16 val; 824 825 if (strict_strtoul(sysfsbuf, 10, &input) < 0) 826 return -EINVAL; 827 828 ret = applesmc_read_key(FANS_MANUAL, buffer, 2); 829 val = (buffer[0] << 8 | buffer[1]); 830 if (ret) 831 goto out; 832 833 if (input) 834 val = val | (0x01 << to_index(attr)); 835 else 836 val = val & ~(0x01 << to_index(attr)); 837 838 buffer[0] = (val >> 8) & 0xFF; 839 buffer[1] = val & 0xFF; 840 841 ret = applesmc_write_key(FANS_MANUAL, buffer, 2); 842 843 out: 844 if (ret) 845 return ret; 846 else 847 return count; 848 } 849 850 static ssize_t applesmc_show_fan_position(struct device *dev, 851 struct device_attribute *attr, char *sysfsbuf) 852 { 853 int ret; 854 char newkey[5]; 855 u8 buffer[17]; 856 857 sprintf(newkey, FAN_ID_FMT, to_index(attr)); 858 859 ret = applesmc_read_key(newkey, buffer, 16); 860 buffer[16] = 0; 861 862 if (ret) 863 return ret; 864 else 865 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4); 866 } 867 868 static ssize_t applesmc_calibrate_show(struct device *dev, 869 struct device_attribute *attr, char *sysfsbuf) 870 { 871 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y); 872 } 873 874 static ssize_t applesmc_calibrate_store(struct device *dev, 875 struct device_attribute *attr, const char *sysfsbuf, size_t count) 876 { 877 applesmc_calibrate(); 878 879 return count; 880 } 881 882 static void applesmc_backlight_set(struct work_struct *work) 883 { 884 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2); 885 } 886 static DECLARE_WORK(backlight_work, &applesmc_backlight_set); 887 888 static void applesmc_brightness_set(struct led_classdev *led_cdev, 889 enum led_brightness value) 890 { 891 int ret; 892 893 backlight_state[0] = value; 894 ret = queue_work(applesmc_led_wq, &backlight_work); 895 896 if (debug && (!ret)) 897 printk(KERN_DEBUG "applesmc: work was already on the queue.\n"); 898 } 899 900 static ssize_t applesmc_key_count_show(struct device *dev, 901 struct device_attribute *attr, char *sysfsbuf) 902 { 903 int ret; 904 u8 buffer[4]; 905 u32 count; 906 907 ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4); 908 count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) + 909 ((u32)buffer[2]<<8) + buffer[3]; 910 911 if (ret) 912 return ret; 913 else 914 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count); 915 } 916 917 static ssize_t applesmc_key_at_index_read_show(struct device *dev, 918 struct device_attribute *attr, char *sysfsbuf) 919 { 920 const struct applesmc_entry *entry; 921 int ret; 922 923 entry = applesmc_get_entry_by_index(key_at_index); 924 if (IS_ERR(entry)) 925 return PTR_ERR(entry); 926 ret = applesmc_read_entry(entry, sysfsbuf, entry->len); 927 if (ret) 928 return ret; 929 930 return entry->len; 931 } 932 933 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev, 934 struct device_attribute *attr, char *sysfsbuf) 935 { 936 const struct applesmc_entry *entry; 937 938 entry = applesmc_get_entry_by_index(key_at_index); 939 if (IS_ERR(entry)) 940 return PTR_ERR(entry); 941 942 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len); 943 } 944 945 static ssize_t applesmc_key_at_index_type_show(struct device *dev, 946 struct device_attribute *attr, char *sysfsbuf) 947 { 948 const struct applesmc_entry *entry; 949 950 entry = applesmc_get_entry_by_index(key_at_index); 951 if (IS_ERR(entry)) 952 return PTR_ERR(entry); 953 954 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type); 955 } 956 957 static ssize_t applesmc_key_at_index_name_show(struct device *dev, 958 struct device_attribute *attr, char *sysfsbuf) 959 { 960 const struct applesmc_entry *entry; 961 962 entry = applesmc_get_entry_by_index(key_at_index); 963 if (IS_ERR(entry)) 964 return PTR_ERR(entry); 965 966 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key); 967 } 968 969 static ssize_t applesmc_key_at_index_show(struct device *dev, 970 struct device_attribute *attr, char *sysfsbuf) 971 { 972 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index); 973 } 974 975 static ssize_t applesmc_key_at_index_store(struct device *dev, 976 struct device_attribute *attr, const char *sysfsbuf, size_t count) 977 { 978 unsigned long newkey; 979 980 if (strict_strtoul(sysfsbuf, 10, &newkey) < 0 981 || newkey >= smcreg.key_count) 982 return -EINVAL; 983 984 key_at_index = newkey; 985 return count; 986 } 987 988 static struct led_classdev applesmc_backlight = { 989 .name = "smc::kbd_backlight", 990 .default_trigger = "nand-disk", 991 .brightness_set = applesmc_brightness_set, 992 }; 993 994 static struct applesmc_node_group info_group[] = { 995 { "name", applesmc_name_show }, 996 { "key_count", applesmc_key_count_show }, 997 { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store }, 998 { "key_at_index_name", applesmc_key_at_index_name_show }, 999 { "key_at_index_type", applesmc_key_at_index_type_show }, 1000 { "key_at_index_data_length", applesmc_key_at_index_data_length_show }, 1001 { "key_at_index_data", applesmc_key_at_index_read_show }, 1002 { } 1003 }; 1004 1005 static struct applesmc_node_group accelerometer_group[] = { 1006 { "position", applesmc_position_show }, 1007 { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store }, 1008 { } 1009 }; 1010 1011 static struct applesmc_node_group light_sensor_group[] = { 1012 { "light", applesmc_light_show }, 1013 { } 1014 }; 1015 1016 static struct applesmc_node_group fan_group[] = { 1017 { "fan%d_label", applesmc_show_fan_position }, 1018 { "fan%d_input", applesmc_show_fan_speed, NULL, 0 }, 1019 { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 }, 1020 { "fan%d_max", applesmc_show_fan_speed, NULL, 2 }, 1021 { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 }, 1022 { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 }, 1023 { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual }, 1024 { } 1025 }; 1026 1027 static struct applesmc_node_group temp_group[] = { 1028 { "temp%d_label", applesmc_show_sensor_label }, 1029 { "temp%d_input", applesmc_show_temperature }, 1030 { } 1031 }; 1032 1033 /* Module stuff */ 1034 1035 /* 1036 * applesmc_destroy_nodes - remove files and free associated memory 1037 */ 1038 static void applesmc_destroy_nodes(struct applesmc_node_group *groups) 1039 { 1040 struct applesmc_node_group *grp; 1041 struct applesmc_dev_attr *node; 1042 1043 for (grp = groups; grp->nodes; grp++) { 1044 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++) 1045 sysfs_remove_file(&pdev->dev.kobj, 1046 &node->sda.dev_attr.attr); 1047 kfree(grp->nodes); 1048 grp->nodes = NULL; 1049 } 1050 } 1051 1052 /* 1053 * applesmc_create_nodes - create a two-dimensional group of sysfs files 1054 */ 1055 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num) 1056 { 1057 struct applesmc_node_group *grp; 1058 struct applesmc_dev_attr *node; 1059 struct attribute *attr; 1060 int ret, i; 1061 1062 for (grp = groups; grp->format; grp++) { 1063 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL); 1064 if (!grp->nodes) { 1065 ret = -ENOMEM; 1066 goto out; 1067 } 1068 for (i = 0; i < num; i++) { 1069 node = &grp->nodes[i]; 1070 sprintf(node->name, grp->format, i + 1); 1071 node->sda.index = (grp->option << 16) | (i & 0xffff); 1072 node->sda.dev_attr.show = grp->show; 1073 node->sda.dev_attr.store = grp->store; 1074 attr = &node->sda.dev_attr.attr; 1075 sysfs_attr_init(attr); 1076 attr->name = node->name; 1077 attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0); 1078 ret = sysfs_create_file(&pdev->dev.kobj, attr); 1079 if (ret) { 1080 attr->name = NULL; 1081 goto out; 1082 } 1083 } 1084 } 1085 1086 return 0; 1087 out: 1088 applesmc_destroy_nodes(groups); 1089 return ret; 1090 } 1091 1092 /* Create accelerometer ressources */ 1093 static int applesmc_create_accelerometer(void) 1094 { 1095 struct input_dev *idev; 1096 int ret; 1097 1098 if (!smcreg.has_accelerometer) 1099 return 0; 1100 1101 ret = applesmc_create_nodes(accelerometer_group, 1); 1102 if (ret) 1103 goto out; 1104 1105 applesmc_idev = input_allocate_polled_device(); 1106 if (!applesmc_idev) { 1107 ret = -ENOMEM; 1108 goto out_sysfs; 1109 } 1110 1111 applesmc_idev->poll = applesmc_idev_poll; 1112 applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL; 1113 1114 /* initial calibrate for the input device */ 1115 applesmc_calibrate(); 1116 1117 /* initialize the input device */ 1118 idev = applesmc_idev->input; 1119 idev->name = "applesmc"; 1120 idev->id.bustype = BUS_HOST; 1121 idev->dev.parent = &pdev->dev; 1122 idev->evbit[0] = BIT_MASK(EV_ABS); 1123 input_set_abs_params(idev, ABS_X, 1124 -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT); 1125 input_set_abs_params(idev, ABS_Y, 1126 -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT); 1127 1128 ret = input_register_polled_device(applesmc_idev); 1129 if (ret) 1130 goto out_idev; 1131 1132 return 0; 1133 1134 out_idev: 1135 input_free_polled_device(applesmc_idev); 1136 1137 out_sysfs: 1138 applesmc_destroy_nodes(accelerometer_group); 1139 1140 out: 1141 pr_warn("driver init failed (ret=%d)!\n", ret); 1142 return ret; 1143 } 1144 1145 /* Release all ressources used by the accelerometer */ 1146 static void applesmc_release_accelerometer(void) 1147 { 1148 if (!smcreg.has_accelerometer) 1149 return; 1150 input_unregister_polled_device(applesmc_idev); 1151 input_free_polled_device(applesmc_idev); 1152 applesmc_destroy_nodes(accelerometer_group); 1153 } 1154 1155 static int applesmc_create_light_sensor(void) 1156 { 1157 if (!smcreg.num_light_sensors) 1158 return 0; 1159 return applesmc_create_nodes(light_sensor_group, 1); 1160 } 1161 1162 static void applesmc_release_light_sensor(void) 1163 { 1164 if (!smcreg.num_light_sensors) 1165 return; 1166 applesmc_destroy_nodes(light_sensor_group); 1167 } 1168 1169 static int applesmc_create_key_backlight(void) 1170 { 1171 if (!smcreg.has_key_backlight) 1172 return 0; 1173 applesmc_led_wq = create_singlethread_workqueue("applesmc-led"); 1174 if (!applesmc_led_wq) 1175 return -ENOMEM; 1176 return led_classdev_register(&pdev->dev, &applesmc_backlight); 1177 } 1178 1179 static void applesmc_release_key_backlight(void) 1180 { 1181 if (!smcreg.has_key_backlight) 1182 return; 1183 led_classdev_unregister(&applesmc_backlight); 1184 destroy_workqueue(applesmc_led_wq); 1185 } 1186 1187 static int applesmc_dmi_match(const struct dmi_system_id *id) 1188 { 1189 return 1; 1190 } 1191 1192 /* Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1". 1193 * So we need to put "Apple MacBook Pro" before "Apple MacBook". */ 1194 static __initdata struct dmi_system_id applesmc_whitelist[] = { 1195 { applesmc_dmi_match, "Apple MacBook Air", { 1196 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1197 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") }, 1198 }, 1199 { applesmc_dmi_match, "Apple MacBook Pro", { 1200 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1201 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") }, 1202 }, 1203 { applesmc_dmi_match, "Apple MacBook", { 1204 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1205 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") }, 1206 }, 1207 { applesmc_dmi_match, "Apple Macmini", { 1208 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1209 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") }, 1210 }, 1211 { applesmc_dmi_match, "Apple MacPro", { 1212 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1213 DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") }, 1214 }, 1215 { applesmc_dmi_match, "Apple iMac", { 1216 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"), 1217 DMI_MATCH(DMI_PRODUCT_NAME, "iMac") }, 1218 }, 1219 { .ident = NULL } 1220 }; 1221 1222 static int __init applesmc_init(void) 1223 { 1224 int ret; 1225 1226 if (!dmi_check_system(applesmc_whitelist)) { 1227 pr_warn("supported laptop not found!\n"); 1228 ret = -ENODEV; 1229 goto out; 1230 } 1231 1232 if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS, 1233 "applesmc")) { 1234 ret = -ENXIO; 1235 goto out; 1236 } 1237 1238 ret = platform_driver_register(&applesmc_driver); 1239 if (ret) 1240 goto out_region; 1241 1242 pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT, 1243 NULL, 0); 1244 if (IS_ERR(pdev)) { 1245 ret = PTR_ERR(pdev); 1246 goto out_driver; 1247 } 1248 1249 /* create register cache */ 1250 ret = applesmc_init_smcreg(); 1251 if (ret) 1252 goto out_device; 1253 1254 ret = applesmc_create_nodes(info_group, 1); 1255 if (ret) 1256 goto out_smcreg; 1257 1258 ret = applesmc_create_nodes(fan_group, smcreg.fan_count); 1259 if (ret) 1260 goto out_info; 1261 1262 ret = applesmc_create_nodes(temp_group, smcreg.temp_count); 1263 if (ret) 1264 goto out_fans; 1265 1266 ret = applesmc_create_accelerometer(); 1267 if (ret) 1268 goto out_temperature; 1269 1270 ret = applesmc_create_light_sensor(); 1271 if (ret) 1272 goto out_accelerometer; 1273 1274 ret = applesmc_create_key_backlight(); 1275 if (ret) 1276 goto out_light_sysfs; 1277 1278 hwmon_dev = hwmon_device_register(&pdev->dev); 1279 if (IS_ERR(hwmon_dev)) { 1280 ret = PTR_ERR(hwmon_dev); 1281 goto out_light_ledclass; 1282 } 1283 1284 return 0; 1285 1286 out_light_ledclass: 1287 applesmc_release_key_backlight(); 1288 out_light_sysfs: 1289 applesmc_release_light_sensor(); 1290 out_accelerometer: 1291 applesmc_release_accelerometer(); 1292 out_temperature: 1293 applesmc_destroy_nodes(temp_group); 1294 out_fans: 1295 applesmc_destroy_nodes(fan_group); 1296 out_info: 1297 applesmc_destroy_nodes(info_group); 1298 out_smcreg: 1299 applesmc_destroy_smcreg(); 1300 out_device: 1301 platform_device_unregister(pdev); 1302 out_driver: 1303 platform_driver_unregister(&applesmc_driver); 1304 out_region: 1305 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS); 1306 out: 1307 pr_warn("driver init failed (ret=%d)!\n", ret); 1308 return ret; 1309 } 1310 1311 static void __exit applesmc_exit(void) 1312 { 1313 hwmon_device_unregister(hwmon_dev); 1314 applesmc_release_key_backlight(); 1315 applesmc_release_light_sensor(); 1316 applesmc_release_accelerometer(); 1317 applesmc_destroy_nodes(temp_group); 1318 applesmc_destroy_nodes(fan_group); 1319 applesmc_destroy_nodes(info_group); 1320 applesmc_destroy_smcreg(); 1321 platform_device_unregister(pdev); 1322 platform_driver_unregister(&applesmc_driver); 1323 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS); 1324 } 1325 1326 module_init(applesmc_init); 1327 module_exit(applesmc_exit); 1328 1329 MODULE_AUTHOR("Nicolas Boichat"); 1330 MODULE_DESCRIPTION("Apple SMC"); 1331 MODULE_LICENSE("GPL v2"); 1332 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist); 1333