1 /* 2 * Device driver for the i2c thermostat found on the iBook G4, Albook G4 3 * 4 * Copyright (C) 2003, 2004 Colin Leroy, Rasmus Rohde, Benjamin Herrenschmidt 5 * 6 * Documentation from 7 * http://www.analog.com/UploadedFiles/Data_Sheets/115254175ADT7467_pra.pdf 8 * http://www.analog.com/UploadedFiles/Data_Sheets/3686221171167ADT7460_b.pdf 9 * 10 */ 11 12 #include <linux/types.h> 13 #include <linux/module.h> 14 #include <linux/errno.h> 15 #include <linux/kernel.h> 16 #include <linux/delay.h> 17 #include <linux/sched.h> 18 #include <linux/i2c.h> 19 #include <linux/slab.h> 20 #include <linux/init.h> 21 #include <linux/spinlock.h> 22 #include <linux/wait.h> 23 #include <linux/suspend.h> 24 #include <linux/kthread.h> 25 #include <linux/moduleparam.h> 26 #include <linux/freezer.h> 27 #include <linux/of_platform.h> 28 29 #include <asm/prom.h> 30 #include <asm/machdep.h> 31 #include <asm/io.h> 32 #include <asm/system.h> 33 #include <asm/sections.h> 34 35 #undef DEBUG 36 37 #define CONFIG_REG 0x40 38 #define MANUAL_MASK 0xe0 39 #define AUTO_MASK 0x20 40 #define INVERT_MASK 0x10 41 42 static u8 TEMP_REG[3] = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */ 43 static u8 LIMIT_REG[3] = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */ 44 static u8 MANUAL_MODE[2] = {0x5c, 0x5d}; 45 static u8 REM_CONTROL[2] = {0x00, 0x40}; 46 static u8 FAN_SPEED[2] = {0x28, 0x2a}; 47 static u8 FAN_SPD_SET[2] = {0x30, 0x31}; 48 49 static u8 default_limits_local[3] = {70, 50, 70}; /* local, sensor1, sensor2 */ 50 static u8 default_limits_chip[3] = {80, 65, 80}; /* local, sensor1, sensor2 */ 51 static const char *sensor_location[3]; 52 53 static int limit_adjust; 54 static int fan_speed = -1; 55 static int verbose; 56 57 MODULE_AUTHOR("Colin Leroy <colin@colino.net>"); 58 MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and " 59 "Powerbook G4 Alu"); 60 MODULE_LICENSE("GPL"); 61 62 module_param(limit_adjust, int, 0644); 63 MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) " 64 "by N degrees."); 65 66 module_param(fan_speed, int, 0644); 67 MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) " 68 "(default 64)"); 69 70 module_param(verbose, bool, 0); 71 MODULE_PARM_DESC(verbose,"Verbose log operations " 72 "(default 0)"); 73 74 struct thermostat { 75 struct i2c_client *clt; 76 u8 temps[3]; 77 u8 cached_temp[3]; 78 u8 initial_limits[3]; 79 u8 limits[3]; 80 int last_speed[2]; 81 int last_var[2]; 82 int pwm_inv[2]; 83 }; 84 85 static enum {ADT7460, ADT7467} therm_type; 86 static int therm_bus, therm_address; 87 static struct of_device * of_dev; 88 static struct thermostat* thermostat; 89 static struct task_struct *thread_therm = NULL; 90 91 static void write_both_fan_speed(struct thermostat *th, int speed); 92 static void write_fan_speed(struct thermostat *th, int speed, int fan); 93 94 static int 95 write_reg(struct thermostat* th, int reg, u8 data) 96 { 97 u8 tmp[2]; 98 int rc; 99 100 tmp[0] = reg; 101 tmp[1] = data; 102 rc = i2c_master_send(th->clt, (const char *)tmp, 2); 103 if (rc < 0) 104 return rc; 105 if (rc != 2) 106 return -ENODEV; 107 return 0; 108 } 109 110 static int 111 read_reg(struct thermostat* th, int reg) 112 { 113 u8 reg_addr, data; 114 int rc; 115 116 reg_addr = (u8)reg; 117 rc = i2c_master_send(th->clt, ®_addr, 1); 118 if (rc < 0) 119 return rc; 120 if (rc != 1) 121 return -ENODEV; 122 rc = i2c_master_recv(th->clt, (char *)&data, 1); 123 if (rc < 0) 124 return rc; 125 return data; 126 } 127 128 static struct i2c_driver thermostat_driver; 129 130 static int 131 attach_thermostat(struct i2c_adapter *adapter) 132 { 133 unsigned long bus_no; 134 struct i2c_board_info info; 135 struct i2c_client *client; 136 137 if (strncmp(adapter->name, "uni-n", 5)) 138 return -ENODEV; 139 bus_no = simple_strtoul(adapter->name + 6, NULL, 10); 140 if (bus_no != therm_bus) 141 return -ENODEV; 142 143 memset(&info, 0, sizeof(struct i2c_board_info)); 144 strlcpy(info.type, "therm_adt746x", I2C_NAME_SIZE); 145 info.addr = therm_address; 146 client = i2c_new_device(adapter, &info); 147 if (!client) 148 return -ENODEV; 149 150 /* 151 * Let i2c-core delete that device on driver removal. 152 * This is safe because i2c-core holds the core_lock mutex for us. 153 */ 154 list_add_tail(&client->detected, &thermostat_driver.clients); 155 return 0; 156 } 157 158 static int 159 remove_thermostat(struct i2c_client *client) 160 { 161 struct thermostat *th = i2c_get_clientdata(client); 162 int i; 163 164 if (thread_therm != NULL) { 165 kthread_stop(thread_therm); 166 } 167 168 printk(KERN_INFO "adt746x: Putting max temperatures back from " 169 "%d, %d, %d to %d, %d, %d\n", 170 th->limits[0], th->limits[1], th->limits[2], 171 th->initial_limits[0], th->initial_limits[1], 172 th->initial_limits[2]); 173 174 for (i = 0; i < 3; i++) 175 write_reg(th, LIMIT_REG[i], th->initial_limits[i]); 176 177 write_both_fan_speed(th, -1); 178 179 thermostat = NULL; 180 181 kfree(th); 182 183 return 0; 184 } 185 186 static int read_fan_speed(struct thermostat *th, u8 addr) 187 { 188 u8 tmp[2]; 189 u16 res; 190 191 /* should start with low byte */ 192 tmp[1] = read_reg(th, addr); 193 tmp[0] = read_reg(th, addr + 1); 194 195 res = tmp[1] + (tmp[0] << 8); 196 /* "a value of 0xffff means that the fan has stopped" */ 197 return (res == 0xffff ? 0 : (90000*60)/res); 198 } 199 200 static void write_both_fan_speed(struct thermostat *th, int speed) 201 { 202 write_fan_speed(th, speed, 0); 203 if (therm_type == ADT7460) 204 write_fan_speed(th, speed, 1); 205 } 206 207 static void write_fan_speed(struct thermostat *th, int speed, int fan) 208 { 209 u8 manual; 210 211 if (speed > 0xff) 212 speed = 0xff; 213 else if (speed < -1) 214 speed = 0; 215 216 if (therm_type == ADT7467 && fan == 1) 217 return; 218 219 if (th->last_speed[fan] != speed) { 220 if (verbose) { 221 if (speed == -1) 222 printk(KERN_DEBUG "adt746x: Setting speed to automatic " 223 "for %s fan.\n", sensor_location[fan+1]); 224 else 225 printk(KERN_DEBUG "adt746x: Setting speed to %d " 226 "for %s fan.\n", speed, sensor_location[fan+1]); 227 } 228 } else 229 return; 230 231 if (speed >= 0) { 232 manual = read_reg(th, MANUAL_MODE[fan]); 233 manual &= ~INVERT_MASK; 234 write_reg(th, MANUAL_MODE[fan], 235 manual | MANUAL_MASK | th->pwm_inv[fan]); 236 write_reg(th, FAN_SPD_SET[fan], speed); 237 } else { 238 /* back to automatic */ 239 if(therm_type == ADT7460) { 240 manual = read_reg(th, 241 MANUAL_MODE[fan]) & (~MANUAL_MASK); 242 manual &= ~INVERT_MASK; 243 manual |= th->pwm_inv[fan]; 244 write_reg(th, 245 MANUAL_MODE[fan], manual|REM_CONTROL[fan]); 246 } else { 247 manual = read_reg(th, MANUAL_MODE[fan]); 248 manual &= ~INVERT_MASK; 249 manual |= th->pwm_inv[fan]; 250 write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK)); 251 } 252 } 253 254 th->last_speed[fan] = speed; 255 } 256 257 static void read_sensors(struct thermostat *th) 258 { 259 int i = 0; 260 261 for (i = 0; i < 3; i++) 262 th->temps[i] = read_reg(th, TEMP_REG[i]); 263 } 264 265 #ifdef DEBUG 266 static void display_stats(struct thermostat *th) 267 { 268 if (th->temps[0] != th->cached_temp[0] 269 || th->temps[1] != th->cached_temp[1] 270 || th->temps[2] != th->cached_temp[2]) { 271 printk(KERN_INFO "adt746x: Temperature infos:" 272 " thermostats: %d,%d,%d;" 273 " limits: %d,%d,%d;" 274 " fan speed: %d RPM\n", 275 th->temps[0], th->temps[1], th->temps[2], 276 th->limits[0], th->limits[1], th->limits[2], 277 read_fan_speed(th, FAN_SPEED[0])); 278 } 279 th->cached_temp[0] = th->temps[0]; 280 th->cached_temp[1] = th->temps[1]; 281 th->cached_temp[2] = th->temps[2]; 282 } 283 #endif 284 285 static void update_fans_speed (struct thermostat *th) 286 { 287 int lastvar = 0; /* last variation, for iBook */ 288 int i = 0; 289 290 /* we don't care about local sensor, so we start at sensor 1 */ 291 for (i = 1; i < 3; i++) { 292 int started = 0; 293 int fan_number = (therm_type == ADT7460 && i == 2); 294 int var = th->temps[i] - th->limits[i]; 295 296 if (var > -1) { 297 int step = (255 - fan_speed) / 7; 298 int new_speed = 0; 299 300 /* hysteresis : change fan speed only if variation is 301 * more than two degrees */ 302 if (abs(var - th->last_var[fan_number]) < 2) 303 continue; 304 305 started = 1; 306 new_speed = fan_speed + ((var-1)*step); 307 308 if (new_speed < fan_speed) 309 new_speed = fan_speed; 310 if (new_speed > 255) 311 new_speed = 255; 312 313 if (verbose) 314 printk(KERN_DEBUG "adt746x: Setting fans speed to %d " 315 "(limit exceeded by %d on %s) \n", 316 new_speed, var, 317 sensor_location[fan_number+1]); 318 write_both_fan_speed(th, new_speed); 319 th->last_var[fan_number] = var; 320 } else if (var < -2) { 321 /* don't stop fan if sensor2 is cold and sensor1 is not 322 * so cold (lastvar >= -1) */ 323 if (i == 2 && lastvar < -1) { 324 if (th->last_speed[fan_number] != 0) 325 if (verbose) 326 printk(KERN_DEBUG "adt746x: Stopping " 327 "fans.\n"); 328 write_both_fan_speed(th, 0); 329 } 330 } 331 332 lastvar = var; 333 334 if (started) 335 return; /* we don't want to re-stop the fan 336 * if sensor1 is heating and sensor2 is not */ 337 } 338 } 339 340 static int monitor_task(void *arg) 341 { 342 struct thermostat* th = arg; 343 344 set_freezable(); 345 while(!kthread_should_stop()) { 346 try_to_freeze(); 347 msleep_interruptible(2000); 348 349 #ifndef DEBUG 350 if (fan_speed != -1) 351 read_sensors(th); 352 #else 353 read_sensors(th); 354 #endif 355 356 if (fan_speed != -1) 357 update_fans_speed(th); 358 359 #ifdef DEBUG 360 display_stats(th); 361 #endif 362 363 } 364 365 return 0; 366 } 367 368 static void set_limit(struct thermostat *th, int i) 369 { 370 /* Set sensor1 limit higher to avoid powerdowns */ 371 th->limits[i] = default_limits_chip[i] + limit_adjust; 372 write_reg(th, LIMIT_REG[i], th->limits[i]); 373 374 /* set our limits to normal */ 375 th->limits[i] = default_limits_local[i] + limit_adjust; 376 } 377 378 static int probe_thermostat(struct i2c_client *client, 379 const struct i2c_device_id *id) 380 { 381 struct thermostat* th; 382 int rc; 383 int i; 384 385 if (thermostat) 386 return 0; 387 388 th = kzalloc(sizeof(struct thermostat), GFP_KERNEL); 389 if (!th) 390 return -ENOMEM; 391 392 i2c_set_clientdata(client, th); 393 th->clt = client; 394 395 rc = read_reg(th, CONFIG_REG); 396 if (rc < 0) { 397 dev_err(&client->dev, "Thermostat failed to read config!\n"); 398 kfree(th); 399 return -ENODEV; 400 } 401 402 /* force manual control to start the fan quieter */ 403 if (fan_speed == -1) 404 fan_speed = 64; 405 406 if(therm_type == ADT7460) { 407 printk(KERN_INFO "adt746x: ADT7460 initializing\n"); 408 /* The 7460 needs to be started explicitly */ 409 write_reg(th, CONFIG_REG, 1); 410 } else 411 printk(KERN_INFO "adt746x: ADT7467 initializing\n"); 412 413 for (i = 0; i < 3; i++) { 414 th->initial_limits[i] = read_reg(th, LIMIT_REG[i]); 415 set_limit(th, i); 416 } 417 418 printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d" 419 " to %d, %d, %d\n", 420 th->initial_limits[0], th->initial_limits[1], 421 th->initial_limits[2], th->limits[0], th->limits[1], 422 th->limits[2]); 423 424 thermostat = th; 425 426 /* record invert bit status because fw can corrupt it after suspend */ 427 th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK; 428 th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK; 429 430 /* be sure to really write fan speed the first time */ 431 th->last_speed[0] = -2; 432 th->last_speed[1] = -2; 433 th->last_var[0] = -80; 434 th->last_var[1] = -80; 435 436 if (fan_speed != -1) { 437 /* manual mode, stop fans */ 438 write_both_fan_speed(th, 0); 439 } else { 440 /* automatic mode */ 441 write_both_fan_speed(th, -1); 442 } 443 444 thread_therm = kthread_run(monitor_task, th, "kfand"); 445 446 if (thread_therm == ERR_PTR(-ENOMEM)) { 447 printk(KERN_INFO "adt746x: Kthread creation failed\n"); 448 thread_therm = NULL; 449 return -ENOMEM; 450 } 451 452 return 0; 453 } 454 455 static const struct i2c_device_id therm_adt746x_id[] = { 456 { "therm_adt746x", 0 }, 457 { } 458 }; 459 460 static struct i2c_driver thermostat_driver = { 461 .driver = { 462 .name = "therm_adt746x", 463 }, 464 .attach_adapter = attach_thermostat, 465 .probe = probe_thermostat, 466 .remove = remove_thermostat, 467 .id_table = therm_adt746x_id, 468 }; 469 470 /* 471 * Now, unfortunately, sysfs doesn't give us a nice void * we could 472 * pass around to the attribute functions, so we don't really have 473 * choice but implement a bunch of them... 474 * 475 * FIXME, it does now... 476 */ 477 #define BUILD_SHOW_FUNC_INT(name, data) \ 478 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ 479 { \ 480 return sprintf(buf, "%d\n", data); \ 481 } 482 483 #define BUILD_SHOW_FUNC_STR(name, data) \ 484 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ 485 { \ 486 return sprintf(buf, "%s\n", data); \ 487 } 488 489 #define BUILD_SHOW_FUNC_FAN(name, data) \ 490 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ 491 { \ 492 return sprintf(buf, "%d (%d rpm)\n", \ 493 thermostat->last_speed[data], \ 494 read_fan_speed(thermostat, FAN_SPEED[data]) \ 495 ); \ 496 } 497 498 #define BUILD_STORE_FUNC_DEG(name, data) \ 499 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \ 500 { \ 501 int val; \ 502 int i; \ 503 val = simple_strtol(buf, NULL, 10); \ 504 printk(KERN_INFO "Adjusting limits by %d degrees\n", val); \ 505 limit_adjust = val; \ 506 for (i=0; i < 3; i++) \ 507 set_limit(thermostat, i); \ 508 return n; \ 509 } 510 511 #define BUILD_STORE_FUNC_INT(name, data) \ 512 static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \ 513 { \ 514 int val; \ 515 val = simple_strtol(buf, NULL, 10); \ 516 if (val < 0 || val > 255) \ 517 return -EINVAL; \ 518 printk(KERN_INFO "Setting specified fan speed to %d\n", val); \ 519 data = val; \ 520 return n; \ 521 } 522 523 BUILD_SHOW_FUNC_INT(sensor1_temperature, (read_reg(thermostat, TEMP_REG[1]))) 524 BUILD_SHOW_FUNC_INT(sensor2_temperature, (read_reg(thermostat, TEMP_REG[2]))) 525 BUILD_SHOW_FUNC_INT(sensor1_limit, thermostat->limits[1]) 526 BUILD_SHOW_FUNC_INT(sensor2_limit, thermostat->limits[2]) 527 BUILD_SHOW_FUNC_STR(sensor1_location, sensor_location[1]) 528 BUILD_SHOW_FUNC_STR(sensor2_location, sensor_location[2]) 529 530 BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed) 531 BUILD_SHOW_FUNC_FAN(sensor1_fan_speed, 0) 532 BUILD_SHOW_FUNC_FAN(sensor2_fan_speed, 1) 533 534 BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed) 535 BUILD_SHOW_FUNC_INT(limit_adjust, limit_adjust) 536 BUILD_STORE_FUNC_DEG(limit_adjust, thermostat) 537 538 static DEVICE_ATTR(sensor1_temperature, S_IRUGO, 539 show_sensor1_temperature,NULL); 540 static DEVICE_ATTR(sensor2_temperature, S_IRUGO, 541 show_sensor2_temperature,NULL); 542 static DEVICE_ATTR(sensor1_limit, S_IRUGO, 543 show_sensor1_limit, NULL); 544 static DEVICE_ATTR(sensor2_limit, S_IRUGO, 545 show_sensor2_limit, NULL); 546 static DEVICE_ATTR(sensor1_location, S_IRUGO, 547 show_sensor1_location, NULL); 548 static DEVICE_ATTR(sensor2_location, S_IRUGO, 549 show_sensor2_location, NULL); 550 551 static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, 552 show_specified_fan_speed,store_specified_fan_speed); 553 554 static DEVICE_ATTR(sensor1_fan_speed, S_IRUGO, 555 show_sensor1_fan_speed, NULL); 556 static DEVICE_ATTR(sensor2_fan_speed, S_IRUGO, 557 show_sensor2_fan_speed, NULL); 558 559 static DEVICE_ATTR(limit_adjust, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, 560 show_limit_adjust, store_limit_adjust); 561 562 563 static int __init 564 thermostat_init(void) 565 { 566 struct device_node* np; 567 const u32 *prop; 568 int i = 0, offset = 0; 569 int err; 570 571 np = of_find_node_by_name(NULL, "fan"); 572 if (!np) 573 return -ENODEV; 574 if (of_device_is_compatible(np, "adt7460")) 575 therm_type = ADT7460; 576 else if (of_device_is_compatible(np, "adt7467")) 577 therm_type = ADT7467; 578 else { 579 of_node_put(np); 580 return -ENODEV; 581 } 582 583 prop = of_get_property(np, "hwsensor-params-version", NULL); 584 printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop, 585 (*prop == 1)?"":"un"); 586 if (*prop != 1) { 587 of_node_put(np); 588 return -ENODEV; 589 } 590 591 prop = of_get_property(np, "reg", NULL); 592 if (!prop) { 593 of_node_put(np); 594 return -ENODEV; 595 } 596 597 /* look for bus either by path or using "reg" */ 598 if (strstr(np->full_name, "/i2c-bus@") != NULL) { 599 const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9); 600 therm_bus = tmp_bus[0]-'0'; 601 } else { 602 therm_bus = ((*prop) >> 8) & 0x0f; 603 } 604 605 therm_address = ((*prop) & 0xff) >> 1; 606 607 printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, " 608 "limit_adjust: %d, fan_speed: %d\n", 609 therm_bus, therm_address, limit_adjust, fan_speed); 610 611 if (of_get_property(np, "hwsensor-location", NULL)) { 612 for (i = 0; i < 3; i++) { 613 sensor_location[i] = of_get_property(np, 614 "hwsensor-location", NULL) + offset; 615 616 if (sensor_location[i] == NULL) 617 sensor_location[i] = ""; 618 619 printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]); 620 offset += strlen(sensor_location[i]) + 1; 621 } 622 } else { 623 sensor_location[0] = "?"; 624 sensor_location[1] = "?"; 625 sensor_location[2] = "?"; 626 } 627 628 of_dev = of_platform_device_create(np, "temperatures", NULL); 629 of_node_put(np); 630 631 if (of_dev == NULL) { 632 printk(KERN_ERR "Can't register temperatures device !\n"); 633 return -ENODEV; 634 } 635 636 err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature); 637 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature); 638 err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit); 639 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit); 640 err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location); 641 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location); 642 err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust); 643 err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed); 644 err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed); 645 if(therm_type == ADT7460) 646 err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed); 647 if (err) 648 printk(KERN_WARNING 649 "Failed to create tempertaure attribute file(s).\n"); 650 651 #ifndef CONFIG_I2C_POWERMAC 652 request_module("i2c-powermac"); 653 #endif 654 655 return i2c_add_driver(&thermostat_driver); 656 } 657 658 static void __exit 659 thermostat_exit(void) 660 { 661 if (of_dev) { 662 device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature); 663 device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature); 664 device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit); 665 device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit); 666 device_remove_file(&of_dev->dev, &dev_attr_sensor1_location); 667 device_remove_file(&of_dev->dev, &dev_attr_sensor2_location); 668 device_remove_file(&of_dev->dev, &dev_attr_limit_adjust); 669 device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed); 670 device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed); 671 672 if(therm_type == ADT7460) 673 device_remove_file(&of_dev->dev, 674 &dev_attr_sensor2_fan_speed); 675 676 of_device_unregister(of_dev); 677 } 678 i2c_del_driver(&thermostat_driver); 679 } 680 681 module_init(thermostat_init); 682 module_exit(thermostat_exit); 683