1 /* 2 * max6650.c - Part of lm_sensors, Linux kernel modules for hardware 3 * monitoring. 4 * 5 * (C) 2007 by Hans J. Koch <hjk@linutronix.de> 6 * 7 * based on code written by John Morris <john.morris@spirentcom.com> 8 * Copyright (c) 2003 Spirent Communications 9 * and Claus Gindhart <claus.gindhart@kontron.com> 10 * 11 * This module has only been tested with the MAX6650 chip. It should 12 * also work with the MAX6651. It does not distinguish max6650 and max6651 13 * chips. 14 * 15 * Tha datasheet was last seen at: 16 * 17 * http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf 18 * 19 * This program is free software; you can redistribute it and/or modify 20 * it under the terms of the GNU General Public License as published by 21 * the Free Software Foundation; either version 2 of the License, or 22 * (at your option) any later version. 23 * 24 * This program is distributed in the hope that it will be useful, 25 * but WITHOUT ANY WARRANTY; without even the implied warranty of 26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 27 * GNU General Public License for more details. 28 * 29 * You should have received a copy of the GNU General Public License 30 * along with this program; if not, write to the Free Software 31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 32 */ 33 34 #include <linux/module.h> 35 #include <linux/init.h> 36 #include <linux/slab.h> 37 #include <linux/jiffies.h> 38 #include <linux/i2c.h> 39 #include <linux/hwmon.h> 40 #include <linux/hwmon-sysfs.h> 41 #include <linux/err.h> 42 43 /* 44 * Addresses to scan. There are four disjoint possibilities, by pin config. 45 */ 46 47 static const unsigned short normal_i2c[] = {0x1b, 0x1f, 0x48, 0x4b, 48 I2C_CLIENT_END}; 49 50 /* 51 * Insmod parameters 52 */ 53 54 /* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */ 55 static int fan_voltage; 56 /* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */ 57 static int prescaler; 58 /* clock: The clock frequency of the chip the driver should assume */ 59 static int clock = 254000; 60 61 module_param(fan_voltage, int, S_IRUGO); 62 module_param(prescaler, int, S_IRUGO); 63 module_param(clock, int, S_IRUGO); 64 65 I2C_CLIENT_INSMOD_1(max6650); 66 67 /* 68 * MAX 6650/6651 registers 69 */ 70 71 #define MAX6650_REG_SPEED 0x00 72 #define MAX6650_REG_CONFIG 0x02 73 #define MAX6650_REG_GPIO_DEF 0x04 74 #define MAX6650_REG_DAC 0x06 75 #define MAX6650_REG_ALARM_EN 0x08 76 #define MAX6650_REG_ALARM 0x0A 77 #define MAX6650_REG_TACH0 0x0C 78 #define MAX6650_REG_TACH1 0x0E 79 #define MAX6650_REG_TACH2 0x10 80 #define MAX6650_REG_TACH3 0x12 81 #define MAX6650_REG_GPIO_STAT 0x14 82 #define MAX6650_REG_COUNT 0x16 83 84 /* 85 * Config register bits 86 */ 87 88 #define MAX6650_CFG_V12 0x08 89 #define MAX6650_CFG_PRESCALER_MASK 0x07 90 #define MAX6650_CFG_PRESCALER_2 0x01 91 #define MAX6650_CFG_PRESCALER_4 0x02 92 #define MAX6650_CFG_PRESCALER_8 0x03 93 #define MAX6650_CFG_PRESCALER_16 0x04 94 #define MAX6650_CFG_MODE_MASK 0x30 95 #define MAX6650_CFG_MODE_ON 0x00 96 #define MAX6650_CFG_MODE_OFF 0x10 97 #define MAX6650_CFG_MODE_CLOSED_LOOP 0x20 98 #define MAX6650_CFG_MODE_OPEN_LOOP 0x30 99 #define MAX6650_COUNT_MASK 0x03 100 101 /* Minimum and maximum values of the FAN-RPM */ 102 #define FAN_RPM_MIN 240 103 #define FAN_RPM_MAX 30000 104 105 #define DIV_FROM_REG(reg) (1 << (reg & 7)) 106 107 static int max6650_probe(struct i2c_client *client, 108 const struct i2c_device_id *id); 109 static int max6650_detect(struct i2c_client *client, int kind, 110 struct i2c_board_info *info); 111 static int max6650_init_client(struct i2c_client *client); 112 static int max6650_remove(struct i2c_client *client); 113 static struct max6650_data *max6650_update_device(struct device *dev); 114 115 /* 116 * Driver data (common to all clients) 117 */ 118 119 static const struct i2c_device_id max6650_id[] = { 120 { "max6650", max6650 }, 121 { } 122 }; 123 MODULE_DEVICE_TABLE(i2c, max6650_id); 124 125 static struct i2c_driver max6650_driver = { 126 .class = I2C_CLASS_HWMON, 127 .driver = { 128 .name = "max6650", 129 }, 130 .probe = max6650_probe, 131 .remove = max6650_remove, 132 .id_table = max6650_id, 133 .detect = max6650_detect, 134 .address_data = &addr_data, 135 }; 136 137 /* 138 * Client data (each client gets its own) 139 */ 140 141 struct max6650_data 142 { 143 struct device *hwmon_dev; 144 struct mutex update_lock; 145 char valid; /* zero until following fields are valid */ 146 unsigned long last_updated; /* in jiffies */ 147 148 /* register values */ 149 u8 speed; 150 u8 config; 151 u8 tach[4]; 152 u8 count; 153 u8 dac; 154 }; 155 156 static ssize_t get_fan(struct device *dev, struct device_attribute *devattr, 157 char *buf) 158 { 159 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 160 struct max6650_data *data = max6650_update_device(dev); 161 int rpm; 162 163 /* 164 * Calculation details: 165 * 166 * Each tachometer counts over an interval given by the "count" 167 * register (0.25, 0.5, 1 or 2 seconds). This module assumes 168 * that the fans produce two pulses per revolution (this seems 169 * to be the most common). 170 */ 171 172 rpm = ((data->tach[attr->index] * 120) / DIV_FROM_REG(data->count)); 173 return sprintf(buf, "%d\n", rpm); 174 } 175 176 /* 177 * Set the fan speed to the specified RPM (or read back the RPM setting). 178 * This works in closed loop mode only. Use pwm1 for open loop speed setting. 179 * 180 * The MAX6650/1 will automatically control fan speed when in closed loop 181 * mode. 182 * 183 * Assumptions: 184 * 185 * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use 186 * the clock module parameter if you need to fine tune this. 187 * 188 * 2) The prescaler (low three bits of the config register) has already 189 * been set to an appropriate value. Use the prescaler module parameter 190 * if your BIOS doesn't initialize the chip properly. 191 * 192 * The relevant equations are given on pages 21 and 22 of the datasheet. 193 * 194 * From the datasheet, the relevant equation when in regulation is: 195 * 196 * [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE 197 * 198 * where: 199 * 200 * fCLK is the oscillator frequency (either the 254kHz internal 201 * oscillator or the externally applied clock) 202 * 203 * KTACH is the value in the speed register 204 * 205 * FanSpeed is the speed of the fan in rps 206 * 207 * KSCALE is the prescaler value (1, 2, 4, 8, or 16) 208 * 209 * When reading, we need to solve for FanSpeed. When writing, we need to 210 * solve for KTACH. 211 * 212 * Note: this tachometer is completely separate from the tachometers 213 * used to measure the fan speeds. Only one fan's speed (fan1) is 214 * controlled. 215 */ 216 217 static ssize_t get_target(struct device *dev, struct device_attribute *devattr, 218 char *buf) 219 { 220 struct max6650_data *data = max6650_update_device(dev); 221 int kscale, ktach, rpm; 222 223 /* 224 * Use the datasheet equation: 225 * 226 * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)] 227 * 228 * then multiply by 60 to give rpm. 229 */ 230 231 kscale = DIV_FROM_REG(data->config); 232 ktach = data->speed; 233 rpm = 60 * kscale * clock / (256 * (ktach + 1)); 234 return sprintf(buf, "%d\n", rpm); 235 } 236 237 static ssize_t set_target(struct device *dev, struct device_attribute *devattr, 238 const char *buf, size_t count) 239 { 240 struct i2c_client *client = to_i2c_client(dev); 241 struct max6650_data *data = i2c_get_clientdata(client); 242 int rpm = simple_strtoul(buf, NULL, 10); 243 int kscale, ktach; 244 245 rpm = SENSORS_LIMIT(rpm, FAN_RPM_MIN, FAN_RPM_MAX); 246 247 /* 248 * Divide the required speed by 60 to get from rpm to rps, then 249 * use the datasheet equation: 250 * 251 * KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1 252 */ 253 254 mutex_lock(&data->update_lock); 255 256 kscale = DIV_FROM_REG(data->config); 257 ktach = ((clock * kscale) / (256 * rpm / 60)) - 1; 258 if (ktach < 0) 259 ktach = 0; 260 if (ktach > 255) 261 ktach = 255; 262 data->speed = ktach; 263 264 i2c_smbus_write_byte_data(client, MAX6650_REG_SPEED, data->speed); 265 266 mutex_unlock(&data->update_lock); 267 268 return count; 269 } 270 271 /* 272 * Get/set the fan speed in open loop mode using pwm1 sysfs file. 273 * Speed is given as a relative value from 0 to 255, where 255 is maximum 274 * speed. Note that this is done by writing directly to the chip's DAC, 275 * it won't change the closed loop speed set by fan1_target. 276 * Also note that due to rounding errors it is possible that you don't read 277 * back exactly the value you have set. 278 */ 279 280 static ssize_t get_pwm(struct device *dev, struct device_attribute *devattr, 281 char *buf) 282 { 283 int pwm; 284 struct max6650_data *data = max6650_update_device(dev); 285 286 /* Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans. 287 Lower DAC values mean higher speeds. */ 288 if (data->config & MAX6650_CFG_V12) 289 pwm = 255 - (255 * (int)data->dac)/180; 290 else 291 pwm = 255 - (255 * (int)data->dac)/76; 292 293 if (pwm < 0) 294 pwm = 0; 295 296 return sprintf(buf, "%d\n", pwm); 297 } 298 299 static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr, 300 const char *buf, size_t count) 301 { 302 struct i2c_client *client = to_i2c_client(dev); 303 struct max6650_data *data = i2c_get_clientdata(client); 304 int pwm = simple_strtoul(buf, NULL, 10); 305 306 pwm = SENSORS_LIMIT(pwm, 0, 255); 307 308 mutex_lock(&data->update_lock); 309 310 if (data->config & MAX6650_CFG_V12) 311 data->dac = 180 - (180 * pwm)/255; 312 else 313 data->dac = 76 - (76 * pwm)/255; 314 315 i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac); 316 317 mutex_unlock(&data->update_lock); 318 319 return count; 320 } 321 322 /* 323 * Get/Set controller mode: 324 * Possible values: 325 * 0 = Fan always on 326 * 1 = Open loop, Voltage is set according to speed, not regulated. 327 * 2 = Closed loop, RPM for all fans regulated by fan1 tachometer 328 */ 329 330 static ssize_t get_enable(struct device *dev, struct device_attribute *devattr, 331 char *buf) 332 { 333 struct max6650_data *data = max6650_update_device(dev); 334 int mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4; 335 int sysfs_modes[4] = {0, 1, 2, 1}; 336 337 return sprintf(buf, "%d\n", sysfs_modes[mode]); 338 } 339 340 static ssize_t set_enable(struct device *dev, struct device_attribute *devattr, 341 const char *buf, size_t count) 342 { 343 struct i2c_client *client = to_i2c_client(dev); 344 struct max6650_data *data = i2c_get_clientdata(client); 345 int mode = simple_strtoul(buf, NULL, 10); 346 int max6650_modes[3] = {0, 3, 2}; 347 348 if ((mode < 0)||(mode > 2)) { 349 dev_err(&client->dev, 350 "illegal value for pwm1_enable (%d)\n", mode); 351 return -EINVAL; 352 } 353 354 mutex_lock(&data->update_lock); 355 356 data->config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); 357 data->config = (data->config & ~MAX6650_CFG_MODE_MASK) 358 | (max6650_modes[mode] << 4); 359 360 i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, data->config); 361 362 mutex_unlock(&data->update_lock); 363 364 return count; 365 } 366 367 /* 368 * Read/write functions for fan1_div sysfs file. The MAX6650 has no such 369 * divider. We handle this by converting between divider and counttime: 370 * 371 * (counttime == k) <==> (divider == 2^k), k = 0, 1, 2, or 3 372 * 373 * Lower values of k allow to connect a faster fan without the risk of 374 * counter overflow. The price is lower resolution. You can also set counttime 375 * using the module parameter. Note that the module parameter "prescaler" also 376 * influences the behaviour. Unfortunately, there's no sysfs attribute 377 * defined for that. See the data sheet for details. 378 */ 379 380 static ssize_t get_div(struct device *dev, struct device_attribute *devattr, 381 char *buf) 382 { 383 struct max6650_data *data = max6650_update_device(dev); 384 385 return sprintf(buf, "%d\n", DIV_FROM_REG(data->count)); 386 } 387 388 static ssize_t set_div(struct device *dev, struct device_attribute *devattr, 389 const char *buf, size_t count) 390 { 391 struct i2c_client *client = to_i2c_client(dev); 392 struct max6650_data *data = i2c_get_clientdata(client); 393 int div = simple_strtoul(buf, NULL, 10); 394 395 mutex_lock(&data->update_lock); 396 switch (div) { 397 case 1: 398 data->count = 0; 399 break; 400 case 2: 401 data->count = 1; 402 break; 403 case 4: 404 data->count = 2; 405 break; 406 case 8: 407 data->count = 3; 408 break; 409 default: 410 dev_err(&client->dev, 411 "illegal value for fan divider (%d)\n", div); 412 return -EINVAL; 413 } 414 415 i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count); 416 mutex_unlock(&data->update_lock); 417 418 return count; 419 } 420 421 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0); 422 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1); 423 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2); 424 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3); 425 static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, get_target, set_target); 426 static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_div, set_div); 427 static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, get_enable, set_enable); 428 static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm); 429 430 431 static struct attribute *max6650_attrs[] = { 432 &sensor_dev_attr_fan1_input.dev_attr.attr, 433 &sensor_dev_attr_fan2_input.dev_attr.attr, 434 &sensor_dev_attr_fan3_input.dev_attr.attr, 435 &sensor_dev_attr_fan4_input.dev_attr.attr, 436 &dev_attr_fan1_target.attr, 437 &dev_attr_fan1_div.attr, 438 &dev_attr_pwm1_enable.attr, 439 &dev_attr_pwm1.attr, 440 NULL 441 }; 442 443 static struct attribute_group max6650_attr_grp = { 444 .attrs = max6650_attrs, 445 }; 446 447 /* 448 * Real code 449 */ 450 451 /* Return 0 if detection is successful, -ENODEV otherwise */ 452 static int max6650_detect(struct i2c_client *client, int kind, 453 struct i2c_board_info *info) 454 { 455 struct i2c_adapter *adapter = client->adapter; 456 int address = client->addr; 457 458 dev_dbg(&adapter->dev, "max6650_detect called, kind = %d\n", kind); 459 460 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 461 dev_dbg(&adapter->dev, "max6650: I2C bus doesn't support " 462 "byte read mode, skipping.\n"); 463 return -ENODEV; 464 } 465 466 /* 467 * Now we do the remaining detection. A negative kind means that 468 * the driver was loaded with no force parameter (default), so we 469 * must both detect and identify the chip (actually there is only 470 * one possible kind of chip for now, max6650). A zero kind means that 471 * the driver was loaded with the force parameter, the detection 472 * step shall be skipped. A positive kind means that the driver 473 * was loaded with the force parameter and a given kind of chip is 474 * requested, so both the detection and the identification steps 475 * are skipped. 476 * 477 * Currently I can find no way to distinguish between a MAX6650 and 478 * a MAX6651. This driver has only been tried on the former. 479 */ 480 481 if ((kind < 0) && 482 ( (i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG) & 0xC0) 483 ||(i2c_smbus_read_byte_data(client, MAX6650_REG_GPIO_STAT) & 0xE0) 484 ||(i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN) & 0xE0) 485 ||(i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM) & 0xE0) 486 ||(i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT) & 0xFC))) { 487 dev_dbg(&adapter->dev, 488 "max6650: detection failed at 0x%02x.\n", address); 489 return -ENODEV; 490 } 491 492 dev_info(&adapter->dev, "max6650: chip found at 0x%02x.\n", address); 493 494 strlcpy(info->type, "max6650", I2C_NAME_SIZE); 495 496 return 0; 497 } 498 499 static int max6650_probe(struct i2c_client *client, 500 const struct i2c_device_id *id) 501 { 502 struct max6650_data *data; 503 int err; 504 505 if (!(data = kzalloc(sizeof(struct max6650_data), GFP_KERNEL))) { 506 dev_err(&client->dev, "out of memory.\n"); 507 return -ENOMEM; 508 } 509 510 i2c_set_clientdata(client, data); 511 mutex_init(&data->update_lock); 512 513 /* 514 * Initialize the max6650 chip 515 */ 516 err = max6650_init_client(client); 517 if (err) 518 goto err_free; 519 520 err = sysfs_create_group(&client->dev.kobj, &max6650_attr_grp); 521 if (err) 522 goto err_free; 523 524 data->hwmon_dev = hwmon_device_register(&client->dev); 525 if (!IS_ERR(data->hwmon_dev)) 526 return 0; 527 528 err = PTR_ERR(data->hwmon_dev); 529 dev_err(&client->dev, "error registering hwmon device.\n"); 530 sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp); 531 err_free: 532 kfree(data); 533 return err; 534 } 535 536 static int max6650_remove(struct i2c_client *client) 537 { 538 struct max6650_data *data = i2c_get_clientdata(client); 539 540 sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp); 541 hwmon_device_unregister(data->hwmon_dev); 542 kfree(data); 543 return 0; 544 } 545 546 static int max6650_init_client(struct i2c_client *client) 547 { 548 struct max6650_data *data = i2c_get_clientdata(client); 549 int config; 550 int err = -EIO; 551 552 config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); 553 554 if (config < 0) { 555 dev_err(&client->dev, "Error reading config, aborting.\n"); 556 return err; 557 } 558 559 switch (fan_voltage) { 560 case 0: 561 break; 562 case 5: 563 config &= ~MAX6650_CFG_V12; 564 break; 565 case 12: 566 config |= MAX6650_CFG_V12; 567 break; 568 default: 569 dev_err(&client->dev, 570 "illegal value for fan_voltage (%d)\n", 571 fan_voltage); 572 } 573 574 dev_info(&client->dev, "Fan voltage is set to %dV.\n", 575 (config & MAX6650_CFG_V12) ? 12 : 5); 576 577 switch (prescaler) { 578 case 0: 579 break; 580 case 1: 581 config &= ~MAX6650_CFG_PRESCALER_MASK; 582 break; 583 case 2: 584 config = (config & ~MAX6650_CFG_PRESCALER_MASK) 585 | MAX6650_CFG_PRESCALER_2; 586 break; 587 case 4: 588 config = (config & ~MAX6650_CFG_PRESCALER_MASK) 589 | MAX6650_CFG_PRESCALER_4; 590 break; 591 case 8: 592 config = (config & ~MAX6650_CFG_PRESCALER_MASK) 593 | MAX6650_CFG_PRESCALER_8; 594 break; 595 case 16: 596 config = (config & ~MAX6650_CFG_PRESCALER_MASK) 597 | MAX6650_CFG_PRESCALER_16; 598 break; 599 default: 600 dev_err(&client->dev, 601 "illegal value for prescaler (%d)\n", 602 prescaler); 603 } 604 605 dev_info(&client->dev, "Prescaler is set to %d.\n", 606 1 << (config & MAX6650_CFG_PRESCALER_MASK)); 607 608 /* If mode is set to "full off", we change it to "open loop" and 609 * set DAC to 255, which has the same effect. We do this because 610 * there's no "full off" mode defined in hwmon specifcations. 611 */ 612 613 if ((config & MAX6650_CFG_MODE_MASK) == MAX6650_CFG_MODE_OFF) { 614 dev_dbg(&client->dev, "Change mode to open loop, full off.\n"); 615 config = (config & ~MAX6650_CFG_MODE_MASK) 616 | MAX6650_CFG_MODE_OPEN_LOOP; 617 if (i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, 255)) { 618 dev_err(&client->dev, "DAC write error, aborting.\n"); 619 return err; 620 } 621 } 622 623 if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) { 624 dev_err(&client->dev, "Config write error, aborting.\n"); 625 return err; 626 } 627 628 data->config = config; 629 data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT); 630 631 return 0; 632 } 633 634 static const u8 tach_reg[] = { 635 MAX6650_REG_TACH0, 636 MAX6650_REG_TACH1, 637 MAX6650_REG_TACH2, 638 MAX6650_REG_TACH3, 639 }; 640 641 static struct max6650_data *max6650_update_device(struct device *dev) 642 { 643 int i; 644 struct i2c_client *client = to_i2c_client(dev); 645 struct max6650_data *data = i2c_get_clientdata(client); 646 647 mutex_lock(&data->update_lock); 648 649 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 650 data->speed = i2c_smbus_read_byte_data(client, 651 MAX6650_REG_SPEED); 652 data->config = i2c_smbus_read_byte_data(client, 653 MAX6650_REG_CONFIG); 654 for (i = 0; i < 4; i++) { 655 data->tach[i] = i2c_smbus_read_byte_data(client, 656 tach_reg[i]); 657 } 658 data->count = i2c_smbus_read_byte_data(client, 659 MAX6650_REG_COUNT); 660 data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC); 661 662 data->last_updated = jiffies; 663 data->valid = 1; 664 } 665 666 mutex_unlock(&data->update_lock); 667 668 return data; 669 } 670 671 static int __init sensors_max6650_init(void) 672 { 673 return i2c_add_driver(&max6650_driver); 674 } 675 676 static void __exit sensors_max6650_exit(void) 677 { 678 i2c_del_driver(&max6650_driver); 679 } 680 681 MODULE_AUTHOR("Hans J. Koch"); 682 MODULE_DESCRIPTION("MAX6650 sensor driver"); 683 MODULE_LICENSE("GPL"); 684 685 module_init(sensors_max6650_init); 686 module_exit(sensors_max6650_exit); 687