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 0 > intrusion0_alarm' 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 */ 55 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f, 56 I2C_CLIENT_END }; 57 58 enum chips { adm9240, ds1780, lm81 }; 59 60 /* ADM9240 registers */ 61 #define ADM9240_REG_MAN_ID 0x3e 62 #define ADM9240_REG_DIE_REV 0x3f 63 #define ADM9240_REG_CONFIG 0x40 64 65 #define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */ 66 #define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2) 67 #define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2) 68 #define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */ 69 #define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr)) 70 #define ADM9240_REG_INT(nr) (0x41 + (nr)) 71 #define ADM9240_REG_INT_MASK(nr) (0x43 + (nr)) 72 #define ADM9240_REG_TEMP 0x27 73 #define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */ 74 #define ADM9240_REG_ANALOG_OUT 0x19 75 #define ADM9240_REG_CHASSIS_CLEAR 0x46 76 #define ADM9240_REG_VID_FAN_DIV 0x47 77 #define ADM9240_REG_I2C_ADDR 0x48 78 #define ADM9240_REG_VID4 0x49 79 #define ADM9240_REG_TEMP_CONF 0x4b 80 81 /* generalised scaling with integer rounding */ 82 static inline int SCALE(long val, int mul, int div) 83 { 84 if (val < 0) 85 return (val * mul - div / 2) / div; 86 else 87 return (val * mul + div / 2) / div; 88 } 89 90 /* adm9240 internally scales voltage measurements */ 91 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 }; 92 93 static inline unsigned int IN_FROM_REG(u8 reg, int n) 94 { 95 return SCALE(reg, nom_mv[n], 192); 96 } 97 98 static inline u8 IN_TO_REG(unsigned long val, int n) 99 { 100 return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255); 101 } 102 103 /* temperature range: -40..125, 127 disables temperature alarm */ 104 static inline s8 TEMP_TO_REG(long val) 105 { 106 return SENSORS_LIMIT(SCALE(val, 1, 1000), -40, 127); 107 } 108 109 /* two fans, each with low fan speed limit */ 110 static inline unsigned int FAN_FROM_REG(u8 reg, u8 div) 111 { 112 if (!reg) /* error */ 113 return -1; 114 115 if (reg == 255) 116 return 0; 117 118 return SCALE(1350000, 1, reg * div); 119 } 120 121 /* analog out 0..1250mV */ 122 static inline u8 AOUT_TO_REG(unsigned long val) 123 { 124 return SENSORS_LIMIT(SCALE(val, 255, 1250), 0, 255); 125 } 126 127 static inline unsigned int AOUT_FROM_REG(u8 reg) 128 { 129 return SCALE(reg, 1250, 255); 130 } 131 132 static int adm9240_probe(struct i2c_client *client, 133 const struct i2c_device_id *id); 134 static int adm9240_detect(struct i2c_client *client, 135 struct i2c_board_info *info); 136 static void adm9240_init_client(struct i2c_client *client); 137 static int adm9240_remove(struct i2c_client *client); 138 static struct adm9240_data *adm9240_update_device(struct device *dev); 139 140 /* driver data */ 141 static const struct i2c_device_id adm9240_id[] = { 142 { "adm9240", adm9240 }, 143 { "ds1780", ds1780 }, 144 { "lm81", lm81 }, 145 { } 146 }; 147 MODULE_DEVICE_TABLE(i2c, adm9240_id); 148 149 static struct i2c_driver adm9240_driver = { 150 .class = I2C_CLASS_HWMON, 151 .driver = { 152 .name = "adm9240", 153 }, 154 .probe = adm9240_probe, 155 .remove = adm9240_remove, 156 .id_table = adm9240_id, 157 .detect = adm9240_detect, 158 .address_list = normal_i2c, 159 }; 160 161 /* per client data */ 162 struct adm9240_data { 163 struct device *hwmon_dev; 164 struct mutex update_lock; 165 char valid; 166 unsigned long last_updated_measure; 167 unsigned long last_updated_config; 168 169 u8 in[6]; /* ro in0_input */ 170 u8 in_max[6]; /* rw in0_max */ 171 u8 in_min[6]; /* rw in0_min */ 172 u8 fan[2]; /* ro fan1_input */ 173 u8 fan_min[2]; /* rw fan1_min */ 174 u8 fan_div[2]; /* rw fan1_div, read-only accessor */ 175 s16 temp; /* ro temp1_input, 9-bit sign-extended */ 176 s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */ 177 u16 alarms; /* ro alarms */ 178 u8 aout; /* rw aout_output */ 179 u8 vid; /* ro vid */ 180 u8 vrm; /* -- vrm set on startup, no accessor */ 181 }; 182 183 /*** sysfs accessors ***/ 184 185 /* temperature */ 186 static ssize_t show_temp(struct device *dev, struct device_attribute *dummy, 187 char *buf) 188 { 189 struct adm9240_data *data = adm9240_update_device(dev); 190 return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */ 191 } 192 193 static ssize_t show_max(struct device *dev, struct device_attribute *devattr, 194 char *buf) 195 { 196 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 197 struct adm9240_data *data = adm9240_update_device(dev); 198 return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000); 199 } 200 201 static ssize_t set_max(struct device *dev, struct device_attribute *devattr, 202 const char *buf, size_t count) 203 { 204 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 205 struct i2c_client *client = to_i2c_client(dev); 206 struct adm9240_data *data = i2c_get_clientdata(client); 207 long val; 208 int err; 209 210 err = kstrtol(buf, 10, &val); 211 if (err) 212 return err; 213 214 mutex_lock(&data->update_lock); 215 data->temp_max[attr->index] = TEMP_TO_REG(val); 216 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index), 217 data->temp_max[attr->index]); 218 mutex_unlock(&data->update_lock); 219 return count; 220 } 221 222 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); 223 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, 224 show_max, set_max, 0); 225 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, 226 show_max, set_max, 1); 227 228 /* voltage */ 229 static ssize_t show_in(struct device *dev, struct device_attribute *devattr, 230 char *buf) 231 { 232 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 233 struct adm9240_data *data = adm9240_update_device(dev); 234 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index], 235 attr->index)); 236 } 237 238 static ssize_t show_in_min(struct device *dev, 239 struct device_attribute *devattr, char *buf) 240 { 241 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 242 struct adm9240_data *data = adm9240_update_device(dev); 243 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index], 244 attr->index)); 245 } 246 247 static ssize_t show_in_max(struct device *dev, 248 struct device_attribute *devattr, char *buf) 249 { 250 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 251 struct adm9240_data *data = adm9240_update_device(dev); 252 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index], 253 attr->index)); 254 } 255 256 static ssize_t set_in_min(struct device *dev, 257 struct device_attribute *devattr, 258 const char *buf, size_t count) 259 { 260 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 261 struct i2c_client *client = to_i2c_client(dev); 262 struct adm9240_data *data = i2c_get_clientdata(client); 263 unsigned long val; 264 int err; 265 266 err = kstrtoul(buf, 10, &val); 267 if (err) 268 return err; 269 270 mutex_lock(&data->update_lock); 271 data->in_min[attr->index] = IN_TO_REG(val, attr->index); 272 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index), 273 data->in_min[attr->index]); 274 mutex_unlock(&data->update_lock); 275 return count; 276 } 277 278 static ssize_t set_in_max(struct device *dev, 279 struct device_attribute *devattr, 280 const char *buf, size_t count) 281 { 282 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 283 struct i2c_client *client = to_i2c_client(dev); 284 struct adm9240_data *data = i2c_get_clientdata(client); 285 unsigned long val; 286 int err; 287 288 err = kstrtoul(buf, 10, &val); 289 if (err) 290 return err; 291 292 mutex_lock(&data->update_lock); 293 data->in_max[attr->index] = IN_TO_REG(val, attr->index); 294 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index), 295 data->in_max[attr->index]); 296 mutex_unlock(&data->update_lock); 297 return count; 298 } 299 300 #define vin(nr) \ 301 static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \ 302 show_in, NULL, nr); \ 303 static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \ 304 show_in_min, set_in_min, nr); \ 305 static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \ 306 show_in_max, set_in_max, nr); 307 308 vin(0); 309 vin(1); 310 vin(2); 311 vin(3); 312 vin(4); 313 vin(5); 314 315 /* fans */ 316 static ssize_t show_fan(struct device *dev, 317 struct device_attribute *devattr, char *buf) 318 { 319 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 320 struct adm9240_data *data = adm9240_update_device(dev); 321 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], 322 1 << data->fan_div[attr->index])); 323 } 324 325 static ssize_t show_fan_min(struct device *dev, 326 struct device_attribute *devattr, char *buf) 327 { 328 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 329 struct adm9240_data *data = adm9240_update_device(dev); 330 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index], 331 1 << data->fan_div[attr->index])); 332 } 333 334 static ssize_t show_fan_div(struct device *dev, 335 struct device_attribute *devattr, char *buf) 336 { 337 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 338 struct adm9240_data *data = adm9240_update_device(dev); 339 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]); 340 } 341 342 /* write new fan div, callers must hold data->update_lock */ 343 static void adm9240_write_fan_div(struct i2c_client *client, int nr, 344 u8 fan_div) 345 { 346 u8 reg, old, shift = (nr + 2) * 2; 347 348 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 349 old = (reg >> shift) & 3; 350 reg &= ~(3 << shift); 351 reg |= (fan_div << shift); 352 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg); 353 dev_dbg(&client->dev, "fan%d clock divider changed from %u " 354 "to %u\n", nr + 1, 1 << old, 1 << fan_div); 355 } 356 357 /* 358 * set fan speed low limit: 359 * 360 * - value is zero: disable fan speed low limit alarm 361 * 362 * - value is below fan speed measurement range: enable fan speed low 363 * limit alarm to be asserted while fan speed too slow to measure 364 * 365 * - otherwise: select fan clock divider to suit fan speed low limit, 366 * measurement code may adjust registers to ensure fan speed reading 367 */ 368 static ssize_t set_fan_min(struct device *dev, 369 struct device_attribute *devattr, 370 const char *buf, size_t count) 371 { 372 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 373 struct i2c_client *client = to_i2c_client(dev); 374 struct adm9240_data *data = i2c_get_clientdata(client); 375 int nr = attr->index; 376 u8 new_div; 377 unsigned long val; 378 int err; 379 380 err = kstrtoul(buf, 10, &val); 381 if (err) 382 return err; 383 384 mutex_lock(&data->update_lock); 385 386 if (!val) { 387 data->fan_min[nr] = 255; 388 new_div = data->fan_div[nr]; 389 390 dev_dbg(&client->dev, "fan%u low limit set disabled\n", 391 nr + 1); 392 393 } else if (val < 1350000 / (8 * 254)) { 394 new_div = 3; 395 data->fan_min[nr] = 254; 396 397 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n", 398 nr + 1, FAN_FROM_REG(254, 1 << new_div)); 399 400 } else { 401 unsigned int new_min = 1350000 / val; 402 403 new_div = 0; 404 while (new_min > 192 && new_div < 3) { 405 new_div++; 406 new_min /= 2; 407 } 408 if (!new_min) /* keep > 0 */ 409 new_min++; 410 411 data->fan_min[nr] = new_min; 412 413 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n", 414 nr + 1, FAN_FROM_REG(new_min, 1 << new_div)); 415 } 416 417 if (new_div != data->fan_div[nr]) { 418 data->fan_div[nr] = new_div; 419 adm9240_write_fan_div(client, nr, new_div); 420 } 421 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr), 422 data->fan_min[nr]); 423 424 mutex_unlock(&data->update_lock); 425 return count; 426 } 427 428 #define fan(nr) \ 429 static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \ 430 show_fan, NULL, nr - 1); \ 431 static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \ 432 show_fan_div, NULL, nr - 1); \ 433 static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \ 434 show_fan_min, set_fan_min, nr - 1); 435 436 fan(1); 437 fan(2); 438 439 /* alarms */ 440 static ssize_t show_alarms(struct device *dev, 441 struct device_attribute *attr, char *buf) 442 { 443 struct adm9240_data *data = adm9240_update_device(dev); 444 return sprintf(buf, "%u\n", data->alarms); 445 } 446 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 447 448 static ssize_t show_alarm(struct device *dev, 449 struct device_attribute *attr, char *buf) 450 { 451 int bitnr = to_sensor_dev_attr(attr)->index; 452 struct adm9240_data *data = adm9240_update_device(dev); 453 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 454 } 455 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 456 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 457 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); 458 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); 459 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); 460 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9); 461 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); 462 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6); 463 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); 464 465 /* vid */ 466 static ssize_t show_vid(struct device *dev, 467 struct device_attribute *attr, char *buf) 468 { 469 struct adm9240_data *data = adm9240_update_device(dev); 470 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 471 } 472 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 473 474 /* analog output */ 475 static ssize_t show_aout(struct device *dev, 476 struct device_attribute *attr, char *buf) 477 { 478 struct adm9240_data *data = adm9240_update_device(dev); 479 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 480 } 481 482 static ssize_t set_aout(struct device *dev, 483 struct device_attribute *attr, 484 const char *buf, size_t count) 485 { 486 struct i2c_client *client = to_i2c_client(dev); 487 struct adm9240_data *data = i2c_get_clientdata(client); 488 long val; 489 int err; 490 491 err = kstrtol(buf, 10, &val); 492 if (err) 493 return err; 494 495 mutex_lock(&data->update_lock); 496 data->aout = AOUT_TO_REG(val); 497 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout); 498 mutex_unlock(&data->update_lock); 499 return count; 500 } 501 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout); 502 503 /* chassis_clear */ 504 static ssize_t chassis_clear_legacy(struct device *dev, 505 struct device_attribute *attr, 506 const char *buf, size_t count) 507 { 508 struct i2c_client *client = to_i2c_client(dev); 509 long val; 510 int err; 511 512 err = kstrtol(buf, 10, &val); 513 if (err) 514 return err; 515 516 dev_warn(dev, "Attribute chassis_clear is deprecated, " 517 "use intrusion0_alarm instead\n"); 518 519 if (val == 1) { 520 i2c_smbus_write_byte_data(client, 521 ADM9240_REG_CHASSIS_CLEAR, 0x80); 522 dev_dbg(&client->dev, "chassis intrusion latch cleared\n"); 523 } 524 return count; 525 } 526 static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear_legacy); 527 528 static ssize_t chassis_clear(struct device *dev, 529 struct device_attribute *attr, 530 const char *buf, size_t count) 531 { 532 struct i2c_client *client = to_i2c_client(dev); 533 struct adm9240_data *data = i2c_get_clientdata(client); 534 unsigned long val; 535 536 if (kstrtoul(buf, 10, &val) || val != 0) 537 return -EINVAL; 538 539 mutex_lock(&data->update_lock); 540 i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80); 541 data->valid = 0; /* Force cache refresh */ 542 mutex_unlock(&data->update_lock); 543 dev_dbg(&client->dev, "chassis intrusion latch cleared\n"); 544 545 return count; 546 } 547 static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm, 548 chassis_clear, 12); 549 550 static struct attribute *adm9240_attributes[] = { 551 &sensor_dev_attr_in0_input.dev_attr.attr, 552 &sensor_dev_attr_in0_min.dev_attr.attr, 553 &sensor_dev_attr_in0_max.dev_attr.attr, 554 &sensor_dev_attr_in0_alarm.dev_attr.attr, 555 &sensor_dev_attr_in1_input.dev_attr.attr, 556 &sensor_dev_attr_in1_min.dev_attr.attr, 557 &sensor_dev_attr_in1_max.dev_attr.attr, 558 &sensor_dev_attr_in1_alarm.dev_attr.attr, 559 &sensor_dev_attr_in2_input.dev_attr.attr, 560 &sensor_dev_attr_in2_min.dev_attr.attr, 561 &sensor_dev_attr_in2_max.dev_attr.attr, 562 &sensor_dev_attr_in2_alarm.dev_attr.attr, 563 &sensor_dev_attr_in3_input.dev_attr.attr, 564 &sensor_dev_attr_in3_min.dev_attr.attr, 565 &sensor_dev_attr_in3_max.dev_attr.attr, 566 &sensor_dev_attr_in3_alarm.dev_attr.attr, 567 &sensor_dev_attr_in4_input.dev_attr.attr, 568 &sensor_dev_attr_in4_min.dev_attr.attr, 569 &sensor_dev_attr_in4_max.dev_attr.attr, 570 &sensor_dev_attr_in4_alarm.dev_attr.attr, 571 &sensor_dev_attr_in5_input.dev_attr.attr, 572 &sensor_dev_attr_in5_min.dev_attr.attr, 573 &sensor_dev_attr_in5_max.dev_attr.attr, 574 &sensor_dev_attr_in5_alarm.dev_attr.attr, 575 &dev_attr_temp1_input.attr, 576 &sensor_dev_attr_temp1_max.dev_attr.attr, 577 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 578 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 579 &sensor_dev_attr_fan1_input.dev_attr.attr, 580 &sensor_dev_attr_fan1_div.dev_attr.attr, 581 &sensor_dev_attr_fan1_min.dev_attr.attr, 582 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 583 &sensor_dev_attr_fan2_input.dev_attr.attr, 584 &sensor_dev_attr_fan2_div.dev_attr.attr, 585 &sensor_dev_attr_fan2_min.dev_attr.attr, 586 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 587 &dev_attr_alarms.attr, 588 &dev_attr_aout_output.attr, 589 &dev_attr_chassis_clear.attr, 590 &sensor_dev_attr_intrusion0_alarm.dev_attr.attr, 591 &dev_attr_cpu0_vid.attr, 592 NULL 593 }; 594 595 static const struct attribute_group adm9240_group = { 596 .attrs = adm9240_attributes, 597 }; 598 599 600 /*** sensor chip detect and driver install ***/ 601 602 /* Return 0 if detection is successful, -ENODEV otherwise */ 603 static int adm9240_detect(struct i2c_client *new_client, 604 struct i2c_board_info *info) 605 { 606 struct i2c_adapter *adapter = new_client->adapter; 607 const char *name = ""; 608 int address = new_client->addr; 609 u8 man_id, die_rev; 610 611 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 612 return -ENODEV; 613 614 /* verify chip: reg address should match i2c address */ 615 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) 616 != address) { 617 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n", 618 address); 619 return -ENODEV; 620 } 621 622 /* check known chip manufacturer */ 623 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID); 624 if (man_id == 0x23) { 625 name = "adm9240"; 626 } else if (man_id == 0xda) { 627 name = "ds1780"; 628 } else if (man_id == 0x01) { 629 name = "lm81"; 630 } else { 631 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n", 632 man_id); 633 return -ENODEV; 634 } 635 636 /* successful detect, print chip info */ 637 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV); 638 dev_info(&adapter->dev, "found %s revision %u\n", 639 man_id == 0x23 ? "ADM9240" : 640 man_id == 0xda ? "DS1780" : "LM81", die_rev); 641 642 strlcpy(info->type, name, I2C_NAME_SIZE); 643 644 return 0; 645 } 646 647 static int adm9240_probe(struct i2c_client *new_client, 648 const struct i2c_device_id *id) 649 { 650 struct adm9240_data *data; 651 int err; 652 653 data = devm_kzalloc(&new_client->dev, sizeof(*data), GFP_KERNEL); 654 if (!data) 655 return -ENOMEM; 656 657 i2c_set_clientdata(new_client, data); 658 mutex_init(&data->update_lock); 659 660 adm9240_init_client(new_client); 661 662 /* populate sysfs filesystem */ 663 err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group); 664 if (err) 665 return err; 666 667 data->hwmon_dev = hwmon_device_register(&new_client->dev); 668 if (IS_ERR(data->hwmon_dev)) { 669 err = PTR_ERR(data->hwmon_dev); 670 goto exit_remove; 671 } 672 673 return 0; 674 675 exit_remove: 676 sysfs_remove_group(&new_client->dev.kobj, &adm9240_group); 677 return err; 678 } 679 680 static int adm9240_remove(struct i2c_client *client) 681 { 682 struct adm9240_data *data = i2c_get_clientdata(client); 683 684 hwmon_device_unregister(data->hwmon_dev); 685 sysfs_remove_group(&client->dev.kobj, &adm9240_group); 686 687 return 0; 688 } 689 690 static void adm9240_init_client(struct i2c_client *client) 691 { 692 struct adm9240_data *data = i2c_get_clientdata(client); 693 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG); 694 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3; 695 696 data->vrm = vid_which_vrm(); /* need this to report vid as mV */ 697 698 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10, 699 data->vrm % 10); 700 701 if (conf & 1) { /* measurement cycle running: report state */ 702 703 dev_info(&client->dev, "status: config 0x%02x mode %u\n", 704 conf, mode); 705 706 } else { /* cold start: open limits before starting chip */ 707 int i; 708 709 for (i = 0; i < 6; i++) { 710 i2c_smbus_write_byte_data(client, 711 ADM9240_REG_IN_MIN(i), 0); 712 i2c_smbus_write_byte_data(client, 713 ADM9240_REG_IN_MAX(i), 255); 714 } 715 i2c_smbus_write_byte_data(client, 716 ADM9240_REG_FAN_MIN(0), 255); 717 i2c_smbus_write_byte_data(client, 718 ADM9240_REG_FAN_MIN(1), 255); 719 i2c_smbus_write_byte_data(client, 720 ADM9240_REG_TEMP_MAX(0), 127); 721 i2c_smbus_write_byte_data(client, 722 ADM9240_REG_TEMP_MAX(1), 127); 723 724 /* start measurement cycle */ 725 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1); 726 727 dev_info(&client->dev, "cold start: config was 0x%02x " 728 "mode %u\n", conf, mode); 729 } 730 } 731 732 static struct adm9240_data *adm9240_update_device(struct device *dev) 733 { 734 struct i2c_client *client = to_i2c_client(dev); 735 struct adm9240_data *data = i2c_get_clientdata(client); 736 int i; 737 738 mutex_lock(&data->update_lock); 739 740 /* minimum measurement cycle: 1.75 seconds */ 741 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4)) 742 || !data->valid) { 743 744 for (i = 0; i < 6; i++) { /* read voltages */ 745 data->in[i] = i2c_smbus_read_byte_data(client, 746 ADM9240_REG_IN(i)); 747 } 748 data->alarms = i2c_smbus_read_byte_data(client, 749 ADM9240_REG_INT(0)) | 750 i2c_smbus_read_byte_data(client, 751 ADM9240_REG_INT(1)) << 8; 752 753 /* 754 * read temperature: assume temperature changes less than 755 * 0.5'C per two measurement cycles thus ignore possible 756 * but unlikely aliasing error on lsb reading. --Grant 757 */ 758 data->temp = ((i2c_smbus_read_byte_data(client, 759 ADM9240_REG_TEMP) << 8) | 760 i2c_smbus_read_byte_data(client, 761 ADM9240_REG_TEMP_CONF)) / 128; 762 763 for (i = 0; i < 2; i++) { /* read fans */ 764 data->fan[i] = i2c_smbus_read_byte_data(client, 765 ADM9240_REG_FAN(i)); 766 767 /* adjust fan clock divider on overflow */ 768 if (data->valid && data->fan[i] == 255 && 769 data->fan_div[i] < 3) { 770 771 adm9240_write_fan_div(client, i, 772 ++data->fan_div[i]); 773 774 /* adjust fan_min if active, but not to 0 */ 775 if (data->fan_min[i] < 255 && 776 data->fan_min[i] >= 2) 777 data->fan_min[i] /= 2; 778 } 779 } 780 data->last_updated_measure = jiffies; 781 } 782 783 /* minimum config reading cycle: 300 seconds */ 784 if (time_after(jiffies, data->last_updated_config + (HZ * 300)) 785 || !data->valid) { 786 787 for (i = 0; i < 6; i++) { 788 data->in_min[i] = i2c_smbus_read_byte_data(client, 789 ADM9240_REG_IN_MIN(i)); 790 data->in_max[i] = i2c_smbus_read_byte_data(client, 791 ADM9240_REG_IN_MAX(i)); 792 } 793 for (i = 0; i < 2; i++) { 794 data->fan_min[i] = i2c_smbus_read_byte_data(client, 795 ADM9240_REG_FAN_MIN(i)); 796 } 797 data->temp_max[0] = i2c_smbus_read_byte_data(client, 798 ADM9240_REG_TEMP_MAX(0)); 799 data->temp_max[1] = i2c_smbus_read_byte_data(client, 800 ADM9240_REG_TEMP_MAX(1)); 801 802 /* read fan divs and 5-bit VID */ 803 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 804 data->fan_div[0] = (i >> 4) & 3; 805 data->fan_div[1] = (i >> 6) & 3; 806 data->vid = i & 0x0f; 807 data->vid |= (i2c_smbus_read_byte_data(client, 808 ADM9240_REG_VID4) & 1) << 4; 809 /* read analog out */ 810 data->aout = i2c_smbus_read_byte_data(client, 811 ADM9240_REG_ANALOG_OUT); 812 813 data->last_updated_config = jiffies; 814 data->valid = 1; 815 } 816 mutex_unlock(&data->update_lock); 817 return data; 818 } 819 820 module_i2c_driver(adm9240_driver); 821 822 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, " 823 "Grant Coady <gcoady.lk@gmail.com> and others"); 824 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver"); 825 MODULE_LICENSE("GPL"); 826