1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * max6639.c - Support for Maxim MAX6639 4 * 5 * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller 6 * 7 * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de> 8 * 9 * based on the initial MAX6639 support from semptian.net 10 * by He Changqing <hechangqing@semptian.com> 11 */ 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/slab.h> 16 #include <linux/jiffies.h> 17 #include <linux/i2c.h> 18 #include <linux/hwmon.h> 19 #include <linux/hwmon-sysfs.h> 20 #include <linux/err.h> 21 #include <linux/mutex.h> 22 #include <linux/platform_data/max6639.h> 23 24 /* Addresses to scan */ 25 static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END }; 26 27 /* The MAX6639 registers, valid channel numbers: 0, 1 */ 28 #define MAX6639_REG_TEMP(ch) (0x00 + (ch)) 29 #define MAX6639_REG_STATUS 0x02 30 #define MAX6639_REG_OUTPUT_MASK 0x03 31 #define MAX6639_REG_GCONFIG 0x04 32 #define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch)) 33 #define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch)) 34 #define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch)) 35 #define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch)) 36 #define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4) 37 #define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4) 38 #define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4) 39 #define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4) 40 #define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch)) 41 #define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch)) 42 #define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch)) 43 #define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch)) 44 #define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch)) 45 #define MAX6639_REG_DEVID 0x3D 46 #define MAX6639_REG_MANUID 0x3E 47 #define MAX6639_REG_DEVREV 0x3F 48 49 /* Register bits */ 50 #define MAX6639_GCONFIG_STANDBY 0x80 51 #define MAX6639_GCONFIG_POR 0x40 52 #define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20 53 #define MAX6639_GCONFIG_CH2_LOCAL 0x10 54 #define MAX6639_GCONFIG_PWM_FREQ_HI 0x08 55 56 #define MAX6639_FAN_CONFIG1_PWM 0x80 57 58 #define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40 59 60 static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 }; 61 62 #define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \ 63 0 : (rpm_ranges[rpm_range] * 30) / (val)) 64 #define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255) 65 66 /* 67 * Client data (each client gets its own) 68 */ 69 struct max6639_data { 70 struct i2c_client *client; 71 struct mutex update_lock; 72 bool valid; /* true if following fields are valid */ 73 unsigned long last_updated; /* In jiffies */ 74 75 /* Register values sampled regularly */ 76 u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */ 77 bool temp_fault[2]; /* Detected temperature diode failure */ 78 u8 fan[2]; /* Register value: TACH count for fans >=30 */ 79 u8 status; /* Detected channel alarms and fan failures */ 80 81 /* Register values only written to */ 82 u8 pwm[2]; /* Register value: Duty cycle 0..120 */ 83 u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */ 84 u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */ 85 u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */ 86 87 /* Register values initialized only once */ 88 u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */ 89 u8 rpm_range; /* Index in above rpm_ranges table */ 90 91 /* Optional regulator for FAN supply */ 92 struct regulator *reg; 93 }; 94 95 static struct max6639_data *max6639_update_device(struct device *dev) 96 { 97 struct max6639_data *data = dev_get_drvdata(dev); 98 struct i2c_client *client = data->client; 99 struct max6639_data *ret = data; 100 int i; 101 int status_reg; 102 103 mutex_lock(&data->update_lock); 104 105 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { 106 int res; 107 108 dev_dbg(&client->dev, "Starting max6639 update\n"); 109 110 status_reg = i2c_smbus_read_byte_data(client, 111 MAX6639_REG_STATUS); 112 if (status_reg < 0) { 113 ret = ERR_PTR(status_reg); 114 goto abort; 115 } 116 117 data->status = status_reg; 118 119 for (i = 0; i < 2; i++) { 120 res = i2c_smbus_read_byte_data(client, 121 MAX6639_REG_FAN_CNT(i)); 122 if (res < 0) { 123 ret = ERR_PTR(res); 124 goto abort; 125 } 126 data->fan[i] = res; 127 128 res = i2c_smbus_read_byte_data(client, 129 MAX6639_REG_TEMP_EXT(i)); 130 if (res < 0) { 131 ret = ERR_PTR(res); 132 goto abort; 133 } 134 data->temp[i] = res >> 5; 135 data->temp_fault[i] = res & 0x01; 136 137 res = i2c_smbus_read_byte_data(client, 138 MAX6639_REG_TEMP(i)); 139 if (res < 0) { 140 ret = ERR_PTR(res); 141 goto abort; 142 } 143 data->temp[i] |= res << 3; 144 } 145 146 data->last_updated = jiffies; 147 data->valid = true; 148 } 149 abort: 150 mutex_unlock(&data->update_lock); 151 152 return ret; 153 } 154 155 static ssize_t temp_input_show(struct device *dev, 156 struct device_attribute *dev_attr, char *buf) 157 { 158 long temp; 159 struct max6639_data *data = max6639_update_device(dev); 160 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 161 162 if (IS_ERR(data)) 163 return PTR_ERR(data); 164 165 temp = data->temp[attr->index] * 125; 166 return sprintf(buf, "%ld\n", temp); 167 } 168 169 static ssize_t temp_fault_show(struct device *dev, 170 struct device_attribute *dev_attr, char *buf) 171 { 172 struct max6639_data *data = max6639_update_device(dev); 173 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 174 175 if (IS_ERR(data)) 176 return PTR_ERR(data); 177 178 return sprintf(buf, "%d\n", data->temp_fault[attr->index]); 179 } 180 181 static ssize_t temp_max_show(struct device *dev, 182 struct device_attribute *dev_attr, char *buf) 183 { 184 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 185 struct max6639_data *data = dev_get_drvdata(dev); 186 187 return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000)); 188 } 189 190 static ssize_t temp_max_store(struct device *dev, 191 struct device_attribute *dev_attr, 192 const char *buf, size_t count) 193 { 194 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 195 struct max6639_data *data = dev_get_drvdata(dev); 196 struct i2c_client *client = data->client; 197 unsigned long val; 198 int res; 199 200 res = kstrtoul(buf, 10, &val); 201 if (res) 202 return res; 203 204 mutex_lock(&data->update_lock); 205 data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val); 206 i2c_smbus_write_byte_data(client, 207 MAX6639_REG_THERM_LIMIT(attr->index), 208 data->temp_therm[attr->index]); 209 mutex_unlock(&data->update_lock); 210 return count; 211 } 212 213 static ssize_t temp_crit_show(struct device *dev, 214 struct device_attribute *dev_attr, char *buf) 215 { 216 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 217 struct max6639_data *data = dev_get_drvdata(dev); 218 219 return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000)); 220 } 221 222 static ssize_t temp_crit_store(struct device *dev, 223 struct device_attribute *dev_attr, 224 const char *buf, size_t count) 225 { 226 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 227 struct max6639_data *data = dev_get_drvdata(dev); 228 struct i2c_client *client = data->client; 229 unsigned long val; 230 int res; 231 232 res = kstrtoul(buf, 10, &val); 233 if (res) 234 return res; 235 236 mutex_lock(&data->update_lock); 237 data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val); 238 i2c_smbus_write_byte_data(client, 239 MAX6639_REG_ALERT_LIMIT(attr->index), 240 data->temp_alert[attr->index]); 241 mutex_unlock(&data->update_lock); 242 return count; 243 } 244 245 static ssize_t temp_emergency_show(struct device *dev, 246 struct device_attribute *dev_attr, 247 char *buf) 248 { 249 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 250 struct max6639_data *data = dev_get_drvdata(dev); 251 252 return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000)); 253 } 254 255 static ssize_t temp_emergency_store(struct device *dev, 256 struct device_attribute *dev_attr, 257 const char *buf, size_t count) 258 { 259 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 260 struct max6639_data *data = dev_get_drvdata(dev); 261 struct i2c_client *client = data->client; 262 unsigned long val; 263 int res; 264 265 res = kstrtoul(buf, 10, &val); 266 if (res) 267 return res; 268 269 mutex_lock(&data->update_lock); 270 data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val); 271 i2c_smbus_write_byte_data(client, 272 MAX6639_REG_OT_LIMIT(attr->index), 273 data->temp_ot[attr->index]); 274 mutex_unlock(&data->update_lock); 275 return count; 276 } 277 278 static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr, 279 char *buf) 280 { 281 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 282 struct max6639_data *data = dev_get_drvdata(dev); 283 284 return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120); 285 } 286 287 static ssize_t pwm_store(struct device *dev, 288 struct device_attribute *dev_attr, const char *buf, 289 size_t count) 290 { 291 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 292 struct max6639_data *data = dev_get_drvdata(dev); 293 struct i2c_client *client = data->client; 294 unsigned long val; 295 int res; 296 297 res = kstrtoul(buf, 10, &val); 298 if (res) 299 return res; 300 301 val = clamp_val(val, 0, 255); 302 303 mutex_lock(&data->update_lock); 304 data->pwm[attr->index] = (u8)(val * 120 / 255); 305 i2c_smbus_write_byte_data(client, 306 MAX6639_REG_TARGTDUTY(attr->index), 307 data->pwm[attr->index]); 308 mutex_unlock(&data->update_lock); 309 return count; 310 } 311 312 static ssize_t fan_input_show(struct device *dev, 313 struct device_attribute *dev_attr, char *buf) 314 { 315 struct max6639_data *data = max6639_update_device(dev); 316 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 317 318 if (IS_ERR(data)) 319 return PTR_ERR(data); 320 321 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], 322 data->rpm_range)); 323 } 324 325 static ssize_t alarm_show(struct device *dev, 326 struct device_attribute *dev_attr, char *buf) 327 { 328 struct max6639_data *data = max6639_update_device(dev); 329 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); 330 331 if (IS_ERR(data)) 332 return PTR_ERR(data); 333 334 return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index))); 335 } 336 337 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); 338 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1); 339 static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0); 340 static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1); 341 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0); 342 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1); 343 static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0); 344 static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1); 345 static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0); 346 static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1); 347 static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0); 348 static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1); 349 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0); 350 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1); 351 static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1); 352 static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0); 353 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3); 354 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2); 355 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7); 356 static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6); 357 static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5); 358 static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4); 359 360 361 static struct attribute *max6639_attrs[] = { 362 &sensor_dev_attr_temp1_input.dev_attr.attr, 363 &sensor_dev_attr_temp2_input.dev_attr.attr, 364 &sensor_dev_attr_temp1_fault.dev_attr.attr, 365 &sensor_dev_attr_temp2_fault.dev_attr.attr, 366 &sensor_dev_attr_temp1_max.dev_attr.attr, 367 &sensor_dev_attr_temp2_max.dev_attr.attr, 368 &sensor_dev_attr_temp1_crit.dev_attr.attr, 369 &sensor_dev_attr_temp2_crit.dev_attr.attr, 370 &sensor_dev_attr_temp1_emergency.dev_attr.attr, 371 &sensor_dev_attr_temp2_emergency.dev_attr.attr, 372 &sensor_dev_attr_pwm1.dev_attr.attr, 373 &sensor_dev_attr_pwm2.dev_attr.attr, 374 &sensor_dev_attr_fan1_input.dev_attr.attr, 375 &sensor_dev_attr_fan2_input.dev_attr.attr, 376 &sensor_dev_attr_fan1_fault.dev_attr.attr, 377 &sensor_dev_attr_fan2_fault.dev_attr.attr, 378 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 379 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, 380 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 381 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, 382 &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, 383 &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr, 384 NULL 385 }; 386 ATTRIBUTE_GROUPS(max6639); 387 388 /* 389 * returns respective index in rpm_ranges table 390 * 1 by default on invalid range 391 */ 392 static int rpm_range_to_reg(int range) 393 { 394 int i; 395 396 for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) { 397 if (rpm_ranges[i] == range) 398 return i; 399 } 400 401 return 1; /* default: 4000 RPM */ 402 } 403 404 static int max6639_init_client(struct i2c_client *client, 405 struct max6639_data *data) 406 { 407 struct max6639_platform_data *max6639_info = 408 dev_get_platdata(&client->dev); 409 int i; 410 int rpm_range = 1; /* default: 4000 RPM */ 411 int err; 412 413 /* Reset chip to default values, see below for GCONFIG setup */ 414 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, 415 MAX6639_GCONFIG_POR); 416 if (err) 417 goto exit; 418 419 /* Fans pulse per revolution is 2 by default */ 420 if (max6639_info && max6639_info->ppr > 0 && 421 max6639_info->ppr < 5) 422 data->ppr = max6639_info->ppr; 423 else 424 data->ppr = 2; 425 data->ppr -= 1; 426 427 if (max6639_info) 428 rpm_range = rpm_range_to_reg(max6639_info->rpm_range); 429 data->rpm_range = rpm_range; 430 431 for (i = 0; i < 2; i++) { 432 433 /* Set Fan pulse per revolution */ 434 err = i2c_smbus_write_byte_data(client, 435 MAX6639_REG_FAN_PPR(i), 436 data->ppr << 6); 437 if (err) 438 goto exit; 439 440 /* Fans config PWM, RPM */ 441 err = i2c_smbus_write_byte_data(client, 442 MAX6639_REG_FAN_CONFIG1(i), 443 MAX6639_FAN_CONFIG1_PWM | rpm_range); 444 if (err) 445 goto exit; 446 447 /* Fans PWM polarity high by default */ 448 if (max6639_info && max6639_info->pwm_polarity == 0) 449 err = i2c_smbus_write_byte_data(client, 450 MAX6639_REG_FAN_CONFIG2a(i), 0x00); 451 else 452 err = i2c_smbus_write_byte_data(client, 453 MAX6639_REG_FAN_CONFIG2a(i), 0x02); 454 if (err) 455 goto exit; 456 457 /* 458 * /THERM full speed enable, 459 * PWM frequency 25kHz, see also GCONFIG below 460 */ 461 err = i2c_smbus_write_byte_data(client, 462 MAX6639_REG_FAN_CONFIG3(i), 463 MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); 464 if (err) 465 goto exit; 466 467 /* Max. temp. 80C/90C/100C */ 468 data->temp_therm[i] = 80; 469 data->temp_alert[i] = 90; 470 data->temp_ot[i] = 100; 471 err = i2c_smbus_write_byte_data(client, 472 MAX6639_REG_THERM_LIMIT(i), 473 data->temp_therm[i]); 474 if (err) 475 goto exit; 476 err = i2c_smbus_write_byte_data(client, 477 MAX6639_REG_ALERT_LIMIT(i), 478 data->temp_alert[i]); 479 if (err) 480 goto exit; 481 err = i2c_smbus_write_byte_data(client, 482 MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]); 483 if (err) 484 goto exit; 485 486 /* PWM 120/120 (i.e. 100%) */ 487 data->pwm[i] = 120; 488 err = i2c_smbus_write_byte_data(client, 489 MAX6639_REG_TARGTDUTY(i), data->pwm[i]); 490 if (err) 491 goto exit; 492 } 493 /* Start monitoring */ 494 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, 495 MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | 496 MAX6639_GCONFIG_PWM_FREQ_HI); 497 exit: 498 return err; 499 } 500 501 /* Return 0 if detection is successful, -ENODEV otherwise */ 502 static int max6639_detect(struct i2c_client *client, 503 struct i2c_board_info *info) 504 { 505 struct i2c_adapter *adapter = client->adapter; 506 int dev_id, manu_id; 507 508 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 509 return -ENODEV; 510 511 /* Actual detection via device and manufacturer ID */ 512 dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID); 513 manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID); 514 if (dev_id != 0x58 || manu_id != 0x4D) 515 return -ENODEV; 516 517 strscpy(info->type, "max6639", I2C_NAME_SIZE); 518 519 return 0; 520 } 521 522 static void max6639_regulator_disable(void *data) 523 { 524 regulator_disable(data); 525 } 526 527 static int max6639_probe(struct i2c_client *client) 528 { 529 struct device *dev = &client->dev; 530 struct max6639_data *data; 531 struct device *hwmon_dev; 532 int err; 533 534 data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL); 535 if (!data) 536 return -ENOMEM; 537 538 data->client = client; 539 540 data->reg = devm_regulator_get_optional(dev, "fan"); 541 if (IS_ERR(data->reg)) { 542 if (PTR_ERR(data->reg) != -ENODEV) 543 return PTR_ERR(data->reg); 544 545 data->reg = NULL; 546 } else { 547 /* Spin up fans */ 548 err = regulator_enable(data->reg); 549 if (err) { 550 dev_err(dev, "Failed to enable fan supply: %d\n", err); 551 return err; 552 } 553 err = devm_add_action_or_reset(dev, max6639_regulator_disable, 554 data->reg); 555 if (err) { 556 dev_err(dev, "Failed to register action: %d\n", err); 557 return err; 558 } 559 } 560 561 mutex_init(&data->update_lock); 562 563 /* Initialize the max6639 chip */ 564 err = max6639_init_client(client, data); 565 if (err < 0) 566 return err; 567 568 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 569 data, 570 max6639_groups); 571 return PTR_ERR_OR_ZERO(hwmon_dev); 572 } 573 574 static int max6639_suspend(struct device *dev) 575 { 576 struct i2c_client *client = to_i2c_client(dev); 577 struct max6639_data *data = dev_get_drvdata(dev); 578 int ret = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); 579 580 if (ret < 0) 581 return ret; 582 583 if (data->reg) 584 regulator_disable(data->reg); 585 586 return i2c_smbus_write_byte_data(client, 587 MAX6639_REG_GCONFIG, ret | MAX6639_GCONFIG_STANDBY); 588 } 589 590 static int max6639_resume(struct device *dev) 591 { 592 struct i2c_client *client = to_i2c_client(dev); 593 struct max6639_data *data = dev_get_drvdata(dev); 594 int ret; 595 596 if (data->reg) { 597 ret = regulator_enable(data->reg); 598 if (ret) { 599 dev_err(dev, "Failed to enable fan supply: %d\n", ret); 600 return ret; 601 } 602 } 603 604 ret = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); 605 if (ret < 0) 606 return ret; 607 608 return i2c_smbus_write_byte_data(client, 609 MAX6639_REG_GCONFIG, ret & ~MAX6639_GCONFIG_STANDBY); 610 } 611 612 static const struct i2c_device_id max6639_id[] = { 613 {"max6639", 0}, 614 { } 615 }; 616 617 MODULE_DEVICE_TABLE(i2c, max6639_id); 618 619 static DEFINE_SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume); 620 621 static const struct of_device_id max6639_of_match[] = { 622 { .compatible = "maxim,max6639", }, 623 { }, 624 }; 625 626 static struct i2c_driver max6639_driver = { 627 .class = I2C_CLASS_HWMON, 628 .driver = { 629 .name = "max6639", 630 .pm = pm_sleep_ptr(&max6639_pm_ops), 631 .of_match_table = max6639_of_match, 632 }, 633 .probe = max6639_probe, 634 .id_table = max6639_id, 635 .detect = max6639_detect, 636 .address_list = normal_i2c, 637 }; 638 639 module_i2c_driver(max6639_driver); 640 641 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); 642 MODULE_DESCRIPTION("max6639 driver"); 643 MODULE_LICENSE("GPL"); 644