1/* 2 * adm9240.c Part of lm_sensors, Linux kernel modules for hardware 3 * monitoring 4 * 5 * Copyright (C) 1999 Frodo Looijaard <frodol@dds.nl> 6 * Philip Edelbrock <phil@netroedge.com> 7 * Copyright (C) 2003 Michiel Rook <michiel@grendelproject.nl> 8 * Copyright (C) 2005 Grant Coady <gcoady.lk@gmail.com> with valuable 9 * guidance from Jean Delvare 10 * 11 * Driver supports Analog Devices ADM9240 12 * Dallas Semiconductor DS1780 13 * National Semiconductor LM81 14 * 15 * ADM9240 is the reference, DS1780 and LM81 are register compatibles 16 * 17 * Voltage Six inputs are scaled by chip, VID also reported 18 * Temperature Chip temperature to 0.5'C, maximum and max_hysteris 19 * Fans 2 fans, low speed alarm, automatic fan clock divider 20 * Alarms 16-bit map of active alarms 21 * Analog Out 0..1250 mV output 22 * 23 * Chassis Intrusion: clear CI latch with 'echo 1 > chassis_clear' 24 * 25 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant 26 * 27 * LM81 extended temp reading not implemented 28 * 29 * This program is free software; you can redistribute it and/or modify 30 * it under the terms of the GNU General Public License as published by 31 * the Free Software Foundation; either version 2 of the License, or 32 * (at your option) any later version. 33 * 34 * This program is distributed in the hope that it will be useful, 35 * but WITHOUT ANY WARRANTY; without even the implied warranty of 36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 37 * GNU General Public License for more details. 38 * 39 * You should have received a copy of the GNU General Public License 40 * along with this program; if not, write to the Free Software 41 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 42 */ 43 44#include <linux/init.h> 45#include <linux/module.h> 46#include <linux/slab.h> 47#include <linux/i2c.h> 48#include <linux/hwmon-sysfs.h> 49#include <linux/hwmon.h> 50#include <linux/hwmon-vid.h> 51#include <linux/err.h> 52#include <linux/mutex.h> 53 54/* Addresses to scan */ 55static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f, 56 I2C_CLIENT_END }; 57 58/* Insmod parameters */ 59I2C_CLIENT_INSMOD_3(adm9240, ds1780, lm81); 60 61/* ADM9240 registers */ 62#define ADM9240_REG_MAN_ID 0x3e 63#define ADM9240_REG_DIE_REV 0x3f 64#define ADM9240_REG_CONFIG 0x40 65 66#define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */ 67#define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2) 68#define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2) 69#define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */ 70#define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr)) 71#define ADM9240_REG_INT(nr) (0x41 + (nr)) 72#define ADM9240_REG_INT_MASK(nr) (0x43 + (nr)) 73#define ADM9240_REG_TEMP 0x27 74#define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */ 75#define ADM9240_REG_ANALOG_OUT 0x19 76#define ADM9240_REG_CHASSIS_CLEAR 0x46 77#define ADM9240_REG_VID_FAN_DIV 0x47 78#define ADM9240_REG_I2C_ADDR 0x48 79#define ADM9240_REG_VID4 0x49 80#define ADM9240_REG_TEMP_CONF 0x4b 81 82/* generalised scaling with integer rounding */ 83static inline int SCALE(long val, int mul, int div) 84{ 85 if (val < 0) 86 return (val * mul - div / 2) / div; 87 else 88 return (val * mul + div / 2) / div; 89} 90 91/* adm9240 internally scales voltage measurements */ 92static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 }; 93 94static inline unsigned int IN_FROM_REG(u8 reg, int n) 95{ 96 return SCALE(reg, nom_mv[n], 192); 97} 98 99static inline u8 IN_TO_REG(unsigned long val, int n) 100{ 101 return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255); 102} 103 104/* temperature range: -40..125, 127 disables temperature alarm */ 105static inline s8 TEMP_TO_REG(long val) 106{ 107 return SENSORS_LIMIT(SCALE(val, 1, 1000), -40, 127); 108} 109 110/* two fans, each with low fan speed limit */ 111static inline unsigned int FAN_FROM_REG(u8 reg, u8 div) 112{ 113 if (!reg) /* error */ 114 return -1; 115 116 if (reg == 255) 117 return 0; 118 119 return SCALE(1350000, 1, reg * div); 120} 121 122/* analog out 0..1250mV */ 123static inline u8 AOUT_TO_REG(unsigned long val) 124{ 125 return SENSORS_LIMIT(SCALE(val, 255, 1250), 0, 255); 126} 127 128static inline unsigned int AOUT_FROM_REG(u8 reg) 129{ 130 return SCALE(reg, 1250, 255); 131} 132 133static int adm9240_attach_adapter(struct i2c_adapter *adapter); 134static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind); 135static void adm9240_init_client(struct i2c_client *client); 136static int adm9240_detach_client(struct i2c_client *client); 137static struct adm9240_data *adm9240_update_device(struct device *dev); 138 139/* driver data */ 140static struct i2c_driver adm9240_driver = { 141 .driver = { 142 .name = "adm9240", 143 }, 144 .id = I2C_DRIVERID_ADM9240, 145 .attach_adapter = adm9240_attach_adapter, 146 .detach_client = adm9240_detach_client, 147}; 148 149/* per client data */ 150struct adm9240_data { 151 enum chips type; 152 struct i2c_client client; 153 struct class_device *class_dev; 154 struct mutex update_lock; 155 char valid; 156 unsigned long last_updated_measure; 157 unsigned long last_updated_config; 158 159 u8 in[6]; /* ro in0_input */ 160 u8 in_max[6]; /* rw in0_max */ 161 u8 in_min[6]; /* rw in0_min */ 162 u8 fan[2]; /* ro fan1_input */ 163 u8 fan_min[2]; /* rw fan1_min */ 164 u8 fan_div[2]; /* rw fan1_div, read-only accessor */ 165 s16 temp; /* ro temp1_input, 9-bit sign-extended */ 166 s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */ 167 u16 alarms; /* ro alarms */ 168 u8 aout; /* rw aout_output */ 169 u8 vid; /* ro vid */ 170 u8 vrm; /* -- vrm set on startup, no accessor */ 171}; 172 173/*** sysfs accessors ***/ 174 175/* temperature */ 176static ssize_t show_temp(struct device *dev, struct device_attribute *dummy, 177 char *buf) 178{ 179 struct adm9240_data *data = adm9240_update_device(dev); 180 return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */ 181} 182 183static ssize_t show_max(struct device *dev, struct device_attribute *devattr, 184 char *buf) 185{ 186 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 187 struct adm9240_data *data = adm9240_update_device(dev); 188 return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000); 189} 190 191static ssize_t set_max(struct device *dev, struct device_attribute *devattr, 192 const char *buf, size_t count) 193{ 194 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 195 struct i2c_client *client = to_i2c_client(dev); 196 struct adm9240_data *data = i2c_get_clientdata(client); 197 long val = simple_strtol(buf, NULL, 10); 198 199 mutex_lock(&data->update_lock); 200 data->temp_max[attr->index] = TEMP_TO_REG(val); 201 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index), 202 data->temp_max[attr->index]); 203 mutex_unlock(&data->update_lock); 204 return count; 205} 206 207static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); 208static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, 209 show_max, set_max, 0); 210static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, 211 show_max, set_max, 1); 212 213/* voltage */ 214static ssize_t show_in(struct device *dev, struct device_attribute *devattr, 215 char *buf) 216{ 217 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 218 struct adm9240_data *data = adm9240_update_device(dev); 219 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index], 220 attr->index)); 221} 222 223static ssize_t show_in_min(struct device *dev, 224 struct device_attribute *devattr, char *buf) 225{ 226 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 227 struct adm9240_data *data = adm9240_update_device(dev); 228 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index], 229 attr->index)); 230} 231 232static ssize_t show_in_max(struct device *dev, 233 struct device_attribute *devattr, char *buf) 234{ 235 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 236 struct adm9240_data *data = adm9240_update_device(dev); 237 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index], 238 attr->index)); 239} 240 241static ssize_t set_in_min(struct device *dev, 242 struct device_attribute *devattr, 243 const char *buf, size_t count) 244{ 245 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 246 struct i2c_client *client = to_i2c_client(dev); 247 struct adm9240_data *data = i2c_get_clientdata(client); 248 unsigned long val = simple_strtoul(buf, NULL, 10); 249 250 mutex_lock(&data->update_lock); 251 data->in_min[attr->index] = IN_TO_REG(val, attr->index); 252 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index), 253 data->in_min[attr->index]); 254 mutex_unlock(&data->update_lock); 255 return count; 256} 257 258static ssize_t set_in_max(struct device *dev, 259 struct device_attribute *devattr, 260 const char *buf, size_t count) 261{ 262 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 263 struct i2c_client *client = to_i2c_client(dev); 264 struct adm9240_data *data = i2c_get_clientdata(client); 265 unsigned long val = simple_strtoul(buf, NULL, 10); 266 267 mutex_lock(&data->update_lock); 268 data->in_max[attr->index] = IN_TO_REG(val, attr->index); 269 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index), 270 data->in_max[attr->index]); 271 mutex_unlock(&data->update_lock); 272 return count; 273} 274 275#define vin(nr) \ 276static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \ 277 show_in, NULL, nr); \ 278static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \ 279 show_in_min, set_in_min, nr); \ 280static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \ 281 show_in_max, set_in_max, nr); 282 283vin(0); 284vin(1); 285vin(2); 286vin(3); 287vin(4); 288vin(5); 289 290/* fans */ 291static ssize_t show_fan(struct device *dev, 292 struct device_attribute *devattr, char *buf) 293{ 294 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 295 struct adm9240_data *data = adm9240_update_device(dev); 296 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], 297 1 << data->fan_div[attr->index])); 298} 299 300static ssize_t show_fan_min(struct device *dev, 301 struct device_attribute *devattr, char *buf) 302{ 303 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 304 struct adm9240_data *data = adm9240_update_device(dev); 305 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index], 306 1 << data->fan_div[attr->index])); 307} 308 309static ssize_t show_fan_div(struct device *dev, 310 struct device_attribute *devattr, char *buf) 311{ 312 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 313 struct adm9240_data *data = adm9240_update_device(dev); 314 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]); 315} 316 317/* write new fan div, callers must hold data->update_lock */ 318static void adm9240_write_fan_div(struct i2c_client *client, int nr, 319 u8 fan_div) 320{ 321 u8 reg, old, shift = (nr + 2) * 2; 322 323 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 324 old = (reg >> shift) & 3; 325 reg &= ~(3 << shift); 326 reg |= (fan_div << shift); 327 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg); 328 dev_dbg(&client->dev, "fan%d clock divider changed from %u " 329 "to %u\n", nr + 1, 1 << old, 1 << fan_div); 330} 331 332/* 333 * set fan speed low limit: 334 * 335 * - value is zero: disable fan speed low limit alarm 336 * 337 * - value is below fan speed measurement range: enable fan speed low 338 * limit alarm to be asserted while fan speed too slow to measure 339 * 340 * - otherwise: select fan clock divider to suit fan speed low limit, 341 * measurement code may adjust registers to ensure fan speed reading 342 */ 343static ssize_t set_fan_min(struct device *dev, 344 struct device_attribute *devattr, 345 const char *buf, size_t count) 346{ 347 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 348 struct i2c_client *client = to_i2c_client(dev); 349 struct adm9240_data *data = i2c_get_clientdata(client); 350 unsigned long val = simple_strtoul(buf, NULL, 10); 351 int nr = attr->index; 352 u8 new_div; 353 354 mutex_lock(&data->update_lock); 355 356 if (!val) { 357 data->fan_min[nr] = 255; 358 new_div = data->fan_div[nr]; 359 360 dev_dbg(&client->dev, "fan%u low limit set disabled\n", 361 nr + 1); 362 363 } else if (val < 1350000 / (8 * 254)) { 364 new_div = 3; 365 data->fan_min[nr] = 254; 366 367 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n", 368 nr + 1, FAN_FROM_REG(254, 1 << new_div)); 369 370 } else { 371 unsigned int new_min = 1350000 / val; 372 373 new_div = 0; 374 while (new_min > 192 && new_div < 3) { 375 new_div++; 376 new_min /= 2; 377 } 378 if (!new_min) /* keep > 0 */ 379 new_min++; 380 381 data->fan_min[nr] = new_min; 382 383 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n", 384 nr + 1, FAN_FROM_REG(new_min, 1 << new_div)); 385 } 386 387 if (new_div != data->fan_div[nr]) { 388 data->fan_div[nr] = new_div; 389 adm9240_write_fan_div(client, nr, new_div); 390 } 391 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr), 392 data->fan_min[nr]); 393 394 mutex_unlock(&data->update_lock); 395 return count; 396} 397 398#define fan(nr) \ 399static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \ 400 show_fan, NULL, nr - 1); \ 401static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \ 402 show_fan_div, NULL, nr - 1); \ 403static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \ 404 show_fan_min, set_fan_min, nr - 1); 405 406fan(1); 407fan(2); 408 409/* alarms */ 410static ssize_t show_alarms(struct device *dev, 411 struct device_attribute *attr, char *buf) 412{ 413 struct adm9240_data *data = adm9240_update_device(dev); 414 return sprintf(buf, "%u\n", data->alarms); 415} 416static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 417 418/* vid */ 419static ssize_t show_vid(struct device *dev, 420 struct device_attribute *attr, char *buf) 421{ 422 struct adm9240_data *data = adm9240_update_device(dev); 423 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 424} 425static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 426 427/* analog output */ 428static ssize_t show_aout(struct device *dev, 429 struct device_attribute *attr, char *buf) 430{ 431 struct adm9240_data *data = adm9240_update_device(dev); 432 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 433} 434 435static ssize_t set_aout(struct device *dev, 436 struct device_attribute *attr, 437 const char *buf, size_t count) 438{ 439 struct i2c_client *client = to_i2c_client(dev); 440 struct adm9240_data *data = i2c_get_clientdata(client); 441 unsigned long val = simple_strtol(buf, NULL, 10); 442 443 mutex_lock(&data->update_lock); 444 data->aout = AOUT_TO_REG(val); 445 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout); 446 mutex_unlock(&data->update_lock); 447 return count; 448} 449static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout); 450 451/* chassis_clear */ 452static ssize_t chassis_clear(struct device *dev, 453 struct device_attribute *attr, 454 const char *buf, size_t count) 455{ 456 struct i2c_client *client = to_i2c_client(dev); 457 unsigned long val = simple_strtol(buf, NULL, 10); 458 459 if (val == 1) { 460 i2c_smbus_write_byte_data(client, 461 ADM9240_REG_CHASSIS_CLEAR, 0x80); 462 dev_dbg(&client->dev, "chassis intrusion latch cleared\n"); 463 } 464 return count; 465} 466static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear); 467 468static struct attribute *adm9240_attributes[] = { 469 &sensor_dev_attr_in0_input.dev_attr.attr, 470 &sensor_dev_attr_in0_min.dev_attr.attr, 471 &sensor_dev_attr_in0_max.dev_attr.attr, 472 &sensor_dev_attr_in1_input.dev_attr.attr, 473 &sensor_dev_attr_in1_min.dev_attr.attr, 474 &sensor_dev_attr_in1_max.dev_attr.attr, 475 &sensor_dev_attr_in2_input.dev_attr.attr, 476 &sensor_dev_attr_in2_min.dev_attr.attr, 477 &sensor_dev_attr_in2_max.dev_attr.attr, 478 &sensor_dev_attr_in3_input.dev_attr.attr, 479 &sensor_dev_attr_in3_min.dev_attr.attr, 480 &sensor_dev_attr_in3_max.dev_attr.attr, 481 &sensor_dev_attr_in4_input.dev_attr.attr, 482 &sensor_dev_attr_in4_min.dev_attr.attr, 483 &sensor_dev_attr_in4_max.dev_attr.attr, 484 &sensor_dev_attr_in5_input.dev_attr.attr, 485 &sensor_dev_attr_in5_min.dev_attr.attr, 486 &sensor_dev_attr_in5_max.dev_attr.attr, 487 &dev_attr_temp1_input.attr, 488 &sensor_dev_attr_temp1_max.dev_attr.attr, 489 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 490 &sensor_dev_attr_fan1_input.dev_attr.attr, 491 &sensor_dev_attr_fan1_div.dev_attr.attr, 492 &sensor_dev_attr_fan1_min.dev_attr.attr, 493 &sensor_dev_attr_fan2_input.dev_attr.attr, 494 &sensor_dev_attr_fan2_div.dev_attr.attr, 495 &sensor_dev_attr_fan2_min.dev_attr.attr, 496 &dev_attr_alarms.attr, 497 &dev_attr_aout_output.attr, 498 &dev_attr_chassis_clear.attr, 499 &dev_attr_cpu0_vid.attr, 500 NULL 501}; 502 503static const struct attribute_group adm9240_group = { 504 .attrs = adm9240_attributes, 505}; 506 507 508/*** sensor chip detect and driver install ***/ 509 510static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind) 511{ 512 struct i2c_client *new_client; 513 struct adm9240_data *data; 514 int err = 0; 515 const char *name = ""; 516 u8 man_id, die_rev; 517 518 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 519 goto exit; 520 521 if (!(data = kzalloc(sizeof(*data), GFP_KERNEL))) { 522 err = -ENOMEM; 523 goto exit; 524 } 525 526 new_client = &data->client; 527 i2c_set_clientdata(new_client, data); 528 new_client->addr = address; 529 new_client->adapter = adapter; 530 new_client->driver = &adm9240_driver; 531 new_client->flags = 0; 532 533 if (kind == 0) { 534 kind = adm9240; 535 } 536 537 if (kind < 0) { 538 539 /* verify chip: reg address should match i2c address */ 540 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) 541 != address) { 542 dev_err(&adapter->dev, "detect fail: address match, " 543 "0x%02x\n", address); 544 goto exit_free; 545 } 546 547 /* check known chip manufacturer */ 548 man_id = i2c_smbus_read_byte_data(new_client, 549 ADM9240_REG_MAN_ID); 550 if (man_id == 0x23) { 551 kind = adm9240; 552 } else if (man_id == 0xda) { 553 kind = ds1780; 554 } else if (man_id == 0x01) { 555 kind = lm81; 556 } else { 557 dev_err(&adapter->dev, "detect fail: unknown manuf, " 558 "0x%02x\n", man_id); 559 goto exit_free; 560 } 561 562 /* successful detect, print chip info */ 563 die_rev = i2c_smbus_read_byte_data(new_client, 564 ADM9240_REG_DIE_REV); 565 dev_info(&adapter->dev, "found %s revision %u\n", 566 man_id == 0x23 ? "ADM9240" : 567 man_id == 0xda ? "DS1780" : "LM81", die_rev); 568 } 569 570 /* either forced or detected chip kind */ 571 if (kind == adm9240) { 572 name = "adm9240"; 573 } else if (kind == ds1780) { 574 name = "ds1780"; 575 } else if (kind == lm81) { 576 name = "lm81"; 577 } 578 579 /* fill in the remaining client fields and attach */ 580 strlcpy(new_client->name, name, I2C_NAME_SIZE); 581 data->type = kind; 582 mutex_init(&data->update_lock); 583 584 if ((err = i2c_attach_client(new_client))) 585 goto exit_free; 586 587 adm9240_init_client(new_client); 588 589 /* populate sysfs filesystem */ 590 if ((err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group))) 591 goto exit_detach; 592 593 data->class_dev = hwmon_device_register(&new_client->dev); 594 if (IS_ERR(data->class_dev)) { 595 err = PTR_ERR(data->class_dev); 596 goto exit_remove; 597 } 598 599 return 0; 600 601exit_remove: 602 sysfs_remove_group(&new_client->dev.kobj, &adm9240_group); 603exit_detach: 604 i2c_detach_client(new_client); 605exit_free: 606 kfree(data); 607exit: 608 return err; 609} 610 611static int adm9240_attach_adapter(struct i2c_adapter *adapter) 612{ 613 if (!(adapter->class & I2C_CLASS_HWMON)) 614 return 0; 615 return i2c_probe(adapter, &addr_data, adm9240_detect); 616} 617 618static int adm9240_detach_client(struct i2c_client *client) 619{ 620 struct adm9240_data *data = i2c_get_clientdata(client); 621 int err; 622 623 hwmon_device_unregister(data->class_dev); 624 sysfs_remove_group(&client->dev.kobj, &adm9240_group); 625 626 if ((err = i2c_detach_client(client))) 627 return err; 628 629 kfree(data); 630 return 0; 631} 632 633static void adm9240_init_client(struct i2c_client *client) 634{ 635 struct adm9240_data *data = i2c_get_clientdata(client); 636 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG); 637 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3; 638 639 data->vrm = vid_which_vrm(); /* need this to report vid as mV */ 640 641 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10, 642 data->vrm % 10); 643 644 if (conf & 1) { /* measurement cycle running: report state */ 645 646 dev_info(&client->dev, "status: config 0x%02x mode %u\n", 647 conf, mode); 648 649 } else { /* cold start: open limits before starting chip */ 650 int i; 651 652 for (i = 0; i < 6; i++) 653 { 654 i2c_smbus_write_byte_data(client, 655 ADM9240_REG_IN_MIN(i), 0); 656 i2c_smbus_write_byte_data(client, 657 ADM9240_REG_IN_MAX(i), 255); 658 } 659 i2c_smbus_write_byte_data(client, 660 ADM9240_REG_FAN_MIN(0), 255); 661 i2c_smbus_write_byte_data(client, 662 ADM9240_REG_FAN_MIN(1), 255); 663 i2c_smbus_write_byte_data(client, 664 ADM9240_REG_TEMP_MAX(0), 127); 665 i2c_smbus_write_byte_data(client, 666 ADM9240_REG_TEMP_MAX(1), 127); 667 668 /* start measurement cycle */ 669 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1); 670 671 dev_info(&client->dev, "cold start: config was 0x%02x " 672 "mode %u\n", conf, mode); 673 } 674} 675 676static struct adm9240_data *adm9240_update_device(struct device *dev) 677{ 678 struct i2c_client *client = to_i2c_client(dev); 679 struct adm9240_data *data = i2c_get_clientdata(client); 680 int i; 681 682 mutex_lock(&data->update_lock); 683 684 /* minimum measurement cycle: 1.75 seconds */ 685 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4)) 686 || !data->valid) { 687 688 for (i = 0; i < 6; i++) /* read voltages */ 689 { 690 data->in[i] = i2c_smbus_read_byte_data(client, 691 ADM9240_REG_IN(i)); 692 } 693 data->alarms = i2c_smbus_read_byte_data(client, 694 ADM9240_REG_INT(0)) | 695 i2c_smbus_read_byte_data(client, 696 ADM9240_REG_INT(1)) << 8; 697 698 /* read temperature: assume temperature changes less than 699 * 0.5'C per two measurement cycles thus ignore possible 700 * but unlikely aliasing error on lsb reading. --Grant */ 701 data->temp = ((i2c_smbus_read_byte_data(client, 702 ADM9240_REG_TEMP) << 8) | 703 i2c_smbus_read_byte_data(client, 704 ADM9240_REG_TEMP_CONF)) / 128; 705 706 for (i = 0; i < 2; i++) /* read fans */ 707 { 708 data->fan[i] = i2c_smbus_read_byte_data(client, 709 ADM9240_REG_FAN(i)); 710 711 /* adjust fan clock divider on overflow */ 712 if (data->valid && data->fan[i] == 255 && 713 data->fan_div[i] < 3) { 714 715 adm9240_write_fan_div(client, i, 716 ++data->fan_div[i]); 717 718 /* adjust fan_min if active, but not to 0 */ 719 if (data->fan_min[i] < 255 && 720 data->fan_min[i] >= 2) 721 data->fan_min[i] /= 2; 722 } 723 } 724 data->last_updated_measure = jiffies; 725 } 726 727 /* minimum config reading cycle: 300 seconds */ 728 if (time_after(jiffies, data->last_updated_config + (HZ * 300)) 729 || !data->valid) { 730 731 for (i = 0; i < 6; i++) 732 { 733 data->in_min[i] = i2c_smbus_read_byte_data(client, 734 ADM9240_REG_IN_MIN(i)); 735 data->in_max[i] = i2c_smbus_read_byte_data(client, 736 ADM9240_REG_IN_MAX(i)); 737 } 738 for (i = 0; i < 2; i++) 739 { 740 data->fan_min[i] = i2c_smbus_read_byte_data(client, 741 ADM9240_REG_FAN_MIN(i)); 742 } 743 data->temp_max[0] = i2c_smbus_read_byte_data(client, 744 ADM9240_REG_TEMP_MAX(0)); 745 data->temp_max[1] = i2c_smbus_read_byte_data(client, 746 ADM9240_REG_TEMP_MAX(1)); 747 748 /* read fan divs and 5-bit VID */ 749 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 750 data->fan_div[0] = (i >> 4) & 3; 751 data->fan_div[1] = (i >> 6) & 3; 752 data->vid = i & 0x0f; 753 data->vid |= (i2c_smbus_read_byte_data(client, 754 ADM9240_REG_VID4) & 1) << 4; 755 /* read analog out */ 756 data->aout = i2c_smbus_read_byte_data(client, 757 ADM9240_REG_ANALOG_OUT); 758 759 data->last_updated_config = jiffies; 760 data->valid = 1; 761 } 762 mutex_unlock(&data->update_lock); 763 return data; 764} 765 766static int __init sensors_adm9240_init(void) 767{ 768 return i2c_add_driver(&adm9240_driver); 769} 770 771static void __exit sensors_adm9240_exit(void) 772{ 773 i2c_del_driver(&adm9240_driver); 774} 775 776MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, " 777 "Grant Coady <gcoady.lk@gmail.com> and others"); 778MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver"); 779MODULE_LICENSE("GPL"); 780 781module_init(sensors_adm9240_init); 782module_exit(sensors_adm9240_exit); 783