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 #include <linux/jiffies.h> 54 55 /* Addresses to scan */ 56 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f, 57 I2C_CLIENT_END }; 58 59 enum chips { 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 */ 83 static 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 */ 92 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 }; 93 94 static inline unsigned int IN_FROM_REG(u8 reg, int n) 95 { 96 return SCALE(reg, nom_mv[n], 192); 97 } 98 99 static 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 */ 105 static 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 */ 111 static 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 */ 123 static inline u8 AOUT_TO_REG(unsigned long val) 124 { 125 return SENSORS_LIMIT(SCALE(val, 255, 1250), 0, 255); 126 } 127 128 static inline unsigned int AOUT_FROM_REG(u8 reg) 129 { 130 return SCALE(reg, 1250, 255); 131 } 132 133 static int adm9240_probe(struct i2c_client *client, 134 const struct i2c_device_id *id); 135 static int adm9240_detect(struct i2c_client *client, 136 struct i2c_board_info *info); 137 static void adm9240_init_client(struct i2c_client *client); 138 static int adm9240_remove(struct i2c_client *client); 139 static struct adm9240_data *adm9240_update_device(struct device *dev); 140 141 /* driver data */ 142 static const struct i2c_device_id adm9240_id[] = { 143 { "adm9240", adm9240 }, 144 { "ds1780", ds1780 }, 145 { "lm81", lm81 }, 146 { } 147 }; 148 MODULE_DEVICE_TABLE(i2c, adm9240_id); 149 150 static struct i2c_driver adm9240_driver = { 151 .class = I2C_CLASS_HWMON, 152 .driver = { 153 .name = "adm9240", 154 }, 155 .probe = adm9240_probe, 156 .remove = adm9240_remove, 157 .id_table = adm9240_id, 158 .detect = adm9240_detect, 159 .address_list = normal_i2c, 160 }; 161 162 /* per client data */ 163 struct adm9240_data { 164 struct device *hwmon_dev; 165 struct mutex update_lock; 166 char valid; 167 unsigned long last_updated_measure; 168 unsigned long last_updated_config; 169 170 u8 in[6]; /* ro in0_input */ 171 u8 in_max[6]; /* rw in0_max */ 172 u8 in_min[6]; /* rw in0_min */ 173 u8 fan[2]; /* ro fan1_input */ 174 u8 fan_min[2]; /* rw fan1_min */ 175 u8 fan_div[2]; /* rw fan1_div, read-only accessor */ 176 s16 temp; /* ro temp1_input, 9-bit sign-extended */ 177 s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */ 178 u16 alarms; /* ro alarms */ 179 u8 aout; /* rw aout_output */ 180 u8 vid; /* ro vid */ 181 u8 vrm; /* -- vrm set on startup, no accessor */ 182 }; 183 184 /*** sysfs accessors ***/ 185 186 /* temperature */ 187 static ssize_t show_temp(struct device *dev, struct device_attribute *dummy, 188 char *buf) 189 { 190 struct adm9240_data *data = adm9240_update_device(dev); 191 return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */ 192 } 193 194 static ssize_t show_max(struct device *dev, struct device_attribute *devattr, 195 char *buf) 196 { 197 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 198 struct adm9240_data *data = adm9240_update_device(dev); 199 return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000); 200 } 201 202 static ssize_t set_max(struct device *dev, struct device_attribute *devattr, 203 const char *buf, size_t count) 204 { 205 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 206 struct i2c_client *client = to_i2c_client(dev); 207 struct adm9240_data *data = i2c_get_clientdata(client); 208 long val; 209 int err; 210 211 err = kstrtol(buf, 10, &val); 212 if (err) 213 return err; 214 215 mutex_lock(&data->update_lock); 216 data->temp_max[attr->index] = TEMP_TO_REG(val); 217 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index), 218 data->temp_max[attr->index]); 219 mutex_unlock(&data->update_lock); 220 return count; 221 } 222 223 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); 224 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, 225 show_max, set_max, 0); 226 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, 227 show_max, set_max, 1); 228 229 /* voltage */ 230 static ssize_t show_in(struct device *dev, struct device_attribute *devattr, 231 char *buf) 232 { 233 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 234 struct adm9240_data *data = adm9240_update_device(dev); 235 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index], 236 attr->index)); 237 } 238 239 static ssize_t show_in_min(struct device *dev, 240 struct device_attribute *devattr, char *buf) 241 { 242 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 243 struct adm9240_data *data = adm9240_update_device(dev); 244 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index], 245 attr->index)); 246 } 247 248 static ssize_t show_in_max(struct device *dev, 249 struct device_attribute *devattr, char *buf) 250 { 251 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 252 struct adm9240_data *data = adm9240_update_device(dev); 253 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index], 254 attr->index)); 255 } 256 257 static ssize_t set_in_min(struct device *dev, 258 struct device_attribute *devattr, 259 const char *buf, size_t count) 260 { 261 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 262 struct i2c_client *client = to_i2c_client(dev); 263 struct adm9240_data *data = i2c_get_clientdata(client); 264 unsigned long val; 265 int err; 266 267 err = kstrtoul(buf, 10, &val); 268 if (err) 269 return err; 270 271 mutex_lock(&data->update_lock); 272 data->in_min[attr->index] = IN_TO_REG(val, attr->index); 273 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index), 274 data->in_min[attr->index]); 275 mutex_unlock(&data->update_lock); 276 return count; 277 } 278 279 static ssize_t set_in_max(struct device *dev, 280 struct device_attribute *devattr, 281 const char *buf, size_t count) 282 { 283 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 284 struct i2c_client *client = to_i2c_client(dev); 285 struct adm9240_data *data = i2c_get_clientdata(client); 286 unsigned long val; 287 int err; 288 289 err = kstrtoul(buf, 10, &val); 290 if (err) 291 return err; 292 293 mutex_lock(&data->update_lock); 294 data->in_max[attr->index] = IN_TO_REG(val, attr->index); 295 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index), 296 data->in_max[attr->index]); 297 mutex_unlock(&data->update_lock); 298 return count; 299 } 300 301 #define vin(nr) \ 302 static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \ 303 show_in, NULL, nr); \ 304 static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \ 305 show_in_min, set_in_min, nr); \ 306 static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \ 307 show_in_max, set_in_max, nr); 308 309 vin(0); 310 vin(1); 311 vin(2); 312 vin(3); 313 vin(4); 314 vin(5); 315 316 /* fans */ 317 static ssize_t show_fan(struct device *dev, 318 struct device_attribute *devattr, char *buf) 319 { 320 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 321 struct adm9240_data *data = adm9240_update_device(dev); 322 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], 323 1 << data->fan_div[attr->index])); 324 } 325 326 static ssize_t show_fan_min(struct device *dev, 327 struct device_attribute *devattr, char *buf) 328 { 329 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 330 struct adm9240_data *data = adm9240_update_device(dev); 331 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index], 332 1 << data->fan_div[attr->index])); 333 } 334 335 static ssize_t show_fan_div(struct device *dev, 336 struct device_attribute *devattr, char *buf) 337 { 338 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 339 struct adm9240_data *data = adm9240_update_device(dev); 340 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]); 341 } 342 343 /* write new fan div, callers must hold data->update_lock */ 344 static void adm9240_write_fan_div(struct i2c_client *client, int nr, 345 u8 fan_div) 346 { 347 u8 reg, old, shift = (nr + 2) * 2; 348 349 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 350 old = (reg >> shift) & 3; 351 reg &= ~(3 << shift); 352 reg |= (fan_div << shift); 353 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg); 354 dev_dbg(&client->dev, "fan%d clock divider changed from %u " 355 "to %u\n", nr + 1, 1 << old, 1 << fan_div); 356 } 357 358 /* 359 * set fan speed low limit: 360 * 361 * - value is zero: disable fan speed low limit alarm 362 * 363 * - value is below fan speed measurement range: enable fan speed low 364 * limit alarm to be asserted while fan speed too slow to measure 365 * 366 * - otherwise: select fan clock divider to suit fan speed low limit, 367 * measurement code may adjust registers to ensure fan speed reading 368 */ 369 static ssize_t set_fan_min(struct device *dev, 370 struct device_attribute *devattr, 371 const char *buf, size_t count) 372 { 373 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 374 struct i2c_client *client = to_i2c_client(dev); 375 struct adm9240_data *data = i2c_get_clientdata(client); 376 int nr = attr->index; 377 u8 new_div; 378 unsigned long val; 379 int err; 380 381 err = kstrtoul(buf, 10, &val); 382 if (err) 383 return err; 384 385 mutex_lock(&data->update_lock); 386 387 if (!val) { 388 data->fan_min[nr] = 255; 389 new_div = data->fan_div[nr]; 390 391 dev_dbg(&client->dev, "fan%u low limit set disabled\n", 392 nr + 1); 393 394 } else if (val < 1350000 / (8 * 254)) { 395 new_div = 3; 396 data->fan_min[nr] = 254; 397 398 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n", 399 nr + 1, FAN_FROM_REG(254, 1 << new_div)); 400 401 } else { 402 unsigned int new_min = 1350000 / val; 403 404 new_div = 0; 405 while (new_min > 192 && new_div < 3) { 406 new_div++; 407 new_min /= 2; 408 } 409 if (!new_min) /* keep > 0 */ 410 new_min++; 411 412 data->fan_min[nr] = new_min; 413 414 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n", 415 nr + 1, FAN_FROM_REG(new_min, 1 << new_div)); 416 } 417 418 if (new_div != data->fan_div[nr]) { 419 data->fan_div[nr] = new_div; 420 adm9240_write_fan_div(client, nr, new_div); 421 } 422 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr), 423 data->fan_min[nr]); 424 425 mutex_unlock(&data->update_lock); 426 return count; 427 } 428 429 #define fan(nr) \ 430 static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \ 431 show_fan, NULL, nr - 1); \ 432 static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \ 433 show_fan_div, NULL, nr - 1); \ 434 static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \ 435 show_fan_min, set_fan_min, nr - 1); 436 437 fan(1); 438 fan(2); 439 440 /* alarms */ 441 static ssize_t show_alarms(struct device *dev, 442 struct device_attribute *attr, char *buf) 443 { 444 struct adm9240_data *data = adm9240_update_device(dev); 445 return sprintf(buf, "%u\n", data->alarms); 446 } 447 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 448 449 static ssize_t show_alarm(struct device *dev, 450 struct device_attribute *attr, char *buf) 451 { 452 int bitnr = to_sensor_dev_attr(attr)->index; 453 struct adm9240_data *data = adm9240_update_device(dev); 454 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 455 } 456 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 457 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 458 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); 459 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); 460 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); 461 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9); 462 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); 463 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6); 464 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); 465 466 /* vid */ 467 static ssize_t show_vid(struct device *dev, 468 struct device_attribute *attr, char *buf) 469 { 470 struct adm9240_data *data = adm9240_update_device(dev); 471 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 472 } 473 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 474 475 /* analog output */ 476 static ssize_t show_aout(struct device *dev, 477 struct device_attribute *attr, char *buf) 478 { 479 struct adm9240_data *data = adm9240_update_device(dev); 480 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 481 } 482 483 static ssize_t set_aout(struct device *dev, 484 struct device_attribute *attr, 485 const char *buf, size_t count) 486 { 487 struct i2c_client *client = to_i2c_client(dev); 488 struct adm9240_data *data = i2c_get_clientdata(client); 489 long val; 490 int err; 491 492 err = kstrtol(buf, 10, &val); 493 if (err) 494 return err; 495 496 mutex_lock(&data->update_lock); 497 data->aout = AOUT_TO_REG(val); 498 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout); 499 mutex_unlock(&data->update_lock); 500 return count; 501 } 502 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout); 503 504 static ssize_t chassis_clear(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 struct adm9240_data *data = i2c_get_clientdata(client); 510 unsigned long val; 511 512 if (kstrtoul(buf, 10, &val) || val != 0) 513 return -EINVAL; 514 515 mutex_lock(&data->update_lock); 516 i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80); 517 data->valid = 0; /* Force cache refresh */ 518 mutex_unlock(&data->update_lock); 519 dev_dbg(&client->dev, "chassis intrusion latch cleared\n"); 520 521 return count; 522 } 523 static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm, 524 chassis_clear, 12); 525 526 static struct attribute *adm9240_attributes[] = { 527 &sensor_dev_attr_in0_input.dev_attr.attr, 528 &sensor_dev_attr_in0_min.dev_attr.attr, 529 &sensor_dev_attr_in0_max.dev_attr.attr, 530 &sensor_dev_attr_in0_alarm.dev_attr.attr, 531 &sensor_dev_attr_in1_input.dev_attr.attr, 532 &sensor_dev_attr_in1_min.dev_attr.attr, 533 &sensor_dev_attr_in1_max.dev_attr.attr, 534 &sensor_dev_attr_in1_alarm.dev_attr.attr, 535 &sensor_dev_attr_in2_input.dev_attr.attr, 536 &sensor_dev_attr_in2_min.dev_attr.attr, 537 &sensor_dev_attr_in2_max.dev_attr.attr, 538 &sensor_dev_attr_in2_alarm.dev_attr.attr, 539 &sensor_dev_attr_in3_input.dev_attr.attr, 540 &sensor_dev_attr_in3_min.dev_attr.attr, 541 &sensor_dev_attr_in3_max.dev_attr.attr, 542 &sensor_dev_attr_in3_alarm.dev_attr.attr, 543 &sensor_dev_attr_in4_input.dev_attr.attr, 544 &sensor_dev_attr_in4_min.dev_attr.attr, 545 &sensor_dev_attr_in4_max.dev_attr.attr, 546 &sensor_dev_attr_in4_alarm.dev_attr.attr, 547 &sensor_dev_attr_in5_input.dev_attr.attr, 548 &sensor_dev_attr_in5_min.dev_attr.attr, 549 &sensor_dev_attr_in5_max.dev_attr.attr, 550 &sensor_dev_attr_in5_alarm.dev_attr.attr, 551 &dev_attr_temp1_input.attr, 552 &sensor_dev_attr_temp1_max.dev_attr.attr, 553 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 554 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 555 &sensor_dev_attr_fan1_input.dev_attr.attr, 556 &sensor_dev_attr_fan1_div.dev_attr.attr, 557 &sensor_dev_attr_fan1_min.dev_attr.attr, 558 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 559 &sensor_dev_attr_fan2_input.dev_attr.attr, 560 &sensor_dev_attr_fan2_div.dev_attr.attr, 561 &sensor_dev_attr_fan2_min.dev_attr.attr, 562 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 563 &dev_attr_alarms.attr, 564 &dev_attr_aout_output.attr, 565 &sensor_dev_attr_intrusion0_alarm.dev_attr.attr, 566 &dev_attr_cpu0_vid.attr, 567 NULL 568 }; 569 570 static const struct attribute_group adm9240_group = { 571 .attrs = adm9240_attributes, 572 }; 573 574 575 /*** sensor chip detect and driver install ***/ 576 577 /* Return 0 if detection is successful, -ENODEV otherwise */ 578 static int adm9240_detect(struct i2c_client *new_client, 579 struct i2c_board_info *info) 580 { 581 struct i2c_adapter *adapter = new_client->adapter; 582 const char *name = ""; 583 int address = new_client->addr; 584 u8 man_id, die_rev; 585 586 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 587 return -ENODEV; 588 589 /* verify chip: reg address should match i2c address */ 590 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) 591 != address) { 592 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n", 593 address); 594 return -ENODEV; 595 } 596 597 /* check known chip manufacturer */ 598 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID); 599 if (man_id == 0x23) { 600 name = "adm9240"; 601 } else if (man_id == 0xda) { 602 name = "ds1780"; 603 } else if (man_id == 0x01) { 604 name = "lm81"; 605 } else { 606 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n", 607 man_id); 608 return -ENODEV; 609 } 610 611 /* successful detect, print chip info */ 612 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV); 613 dev_info(&adapter->dev, "found %s revision %u\n", 614 man_id == 0x23 ? "ADM9240" : 615 man_id == 0xda ? "DS1780" : "LM81", die_rev); 616 617 strlcpy(info->type, name, I2C_NAME_SIZE); 618 619 return 0; 620 } 621 622 static int adm9240_probe(struct i2c_client *new_client, 623 const struct i2c_device_id *id) 624 { 625 struct adm9240_data *data; 626 int err; 627 628 data = devm_kzalloc(&new_client->dev, sizeof(*data), GFP_KERNEL); 629 if (!data) 630 return -ENOMEM; 631 632 i2c_set_clientdata(new_client, data); 633 mutex_init(&data->update_lock); 634 635 adm9240_init_client(new_client); 636 637 /* populate sysfs filesystem */ 638 err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group); 639 if (err) 640 return err; 641 642 data->hwmon_dev = hwmon_device_register(&new_client->dev); 643 if (IS_ERR(data->hwmon_dev)) { 644 err = PTR_ERR(data->hwmon_dev); 645 goto exit_remove; 646 } 647 648 return 0; 649 650 exit_remove: 651 sysfs_remove_group(&new_client->dev.kobj, &adm9240_group); 652 return err; 653 } 654 655 static int adm9240_remove(struct i2c_client *client) 656 { 657 struct adm9240_data *data = i2c_get_clientdata(client); 658 659 hwmon_device_unregister(data->hwmon_dev); 660 sysfs_remove_group(&client->dev.kobj, &adm9240_group); 661 662 return 0; 663 } 664 665 static void adm9240_init_client(struct i2c_client *client) 666 { 667 struct adm9240_data *data = i2c_get_clientdata(client); 668 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG); 669 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3; 670 671 data->vrm = vid_which_vrm(); /* need this to report vid as mV */ 672 673 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10, 674 data->vrm % 10); 675 676 if (conf & 1) { /* measurement cycle running: report state */ 677 678 dev_info(&client->dev, "status: config 0x%02x mode %u\n", 679 conf, mode); 680 681 } else { /* cold start: open limits before starting chip */ 682 int i; 683 684 for (i = 0; i < 6; i++) { 685 i2c_smbus_write_byte_data(client, 686 ADM9240_REG_IN_MIN(i), 0); 687 i2c_smbus_write_byte_data(client, 688 ADM9240_REG_IN_MAX(i), 255); 689 } 690 i2c_smbus_write_byte_data(client, 691 ADM9240_REG_FAN_MIN(0), 255); 692 i2c_smbus_write_byte_data(client, 693 ADM9240_REG_FAN_MIN(1), 255); 694 i2c_smbus_write_byte_data(client, 695 ADM9240_REG_TEMP_MAX(0), 127); 696 i2c_smbus_write_byte_data(client, 697 ADM9240_REG_TEMP_MAX(1), 127); 698 699 /* start measurement cycle */ 700 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1); 701 702 dev_info(&client->dev, "cold start: config was 0x%02x " 703 "mode %u\n", conf, mode); 704 } 705 } 706 707 static struct adm9240_data *adm9240_update_device(struct device *dev) 708 { 709 struct i2c_client *client = to_i2c_client(dev); 710 struct adm9240_data *data = i2c_get_clientdata(client); 711 int i; 712 713 mutex_lock(&data->update_lock); 714 715 /* minimum measurement cycle: 1.75 seconds */ 716 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4)) 717 || !data->valid) { 718 719 for (i = 0; i < 6; i++) { /* read voltages */ 720 data->in[i] = i2c_smbus_read_byte_data(client, 721 ADM9240_REG_IN(i)); 722 } 723 data->alarms = i2c_smbus_read_byte_data(client, 724 ADM9240_REG_INT(0)) | 725 i2c_smbus_read_byte_data(client, 726 ADM9240_REG_INT(1)) << 8; 727 728 /* 729 * read temperature: assume temperature changes less than 730 * 0.5'C per two measurement cycles thus ignore possible 731 * but unlikely aliasing error on lsb reading. --Grant 732 */ 733 data->temp = ((i2c_smbus_read_byte_data(client, 734 ADM9240_REG_TEMP) << 8) | 735 i2c_smbus_read_byte_data(client, 736 ADM9240_REG_TEMP_CONF)) / 128; 737 738 for (i = 0; i < 2; i++) { /* read fans */ 739 data->fan[i] = i2c_smbus_read_byte_data(client, 740 ADM9240_REG_FAN(i)); 741 742 /* adjust fan clock divider on overflow */ 743 if (data->valid && data->fan[i] == 255 && 744 data->fan_div[i] < 3) { 745 746 adm9240_write_fan_div(client, i, 747 ++data->fan_div[i]); 748 749 /* adjust fan_min if active, but not to 0 */ 750 if (data->fan_min[i] < 255 && 751 data->fan_min[i] >= 2) 752 data->fan_min[i] /= 2; 753 } 754 } 755 data->last_updated_measure = jiffies; 756 } 757 758 /* minimum config reading cycle: 300 seconds */ 759 if (time_after(jiffies, data->last_updated_config + (HZ * 300)) 760 || !data->valid) { 761 762 for (i = 0; i < 6; i++) { 763 data->in_min[i] = i2c_smbus_read_byte_data(client, 764 ADM9240_REG_IN_MIN(i)); 765 data->in_max[i] = i2c_smbus_read_byte_data(client, 766 ADM9240_REG_IN_MAX(i)); 767 } 768 for (i = 0; i < 2; i++) { 769 data->fan_min[i] = i2c_smbus_read_byte_data(client, 770 ADM9240_REG_FAN_MIN(i)); 771 } 772 data->temp_max[0] = i2c_smbus_read_byte_data(client, 773 ADM9240_REG_TEMP_MAX(0)); 774 data->temp_max[1] = i2c_smbus_read_byte_data(client, 775 ADM9240_REG_TEMP_MAX(1)); 776 777 /* read fan divs and 5-bit VID */ 778 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 779 data->fan_div[0] = (i >> 4) & 3; 780 data->fan_div[1] = (i >> 6) & 3; 781 data->vid = i & 0x0f; 782 data->vid |= (i2c_smbus_read_byte_data(client, 783 ADM9240_REG_VID4) & 1) << 4; 784 /* read analog out */ 785 data->aout = i2c_smbus_read_byte_data(client, 786 ADM9240_REG_ANALOG_OUT); 787 788 data->last_updated_config = jiffies; 789 data->valid = 1; 790 } 791 mutex_unlock(&data->update_lock); 792 return data; 793 } 794 795 module_i2c_driver(adm9240_driver); 796 797 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, " 798 "Grant Coady <gcoady.lk@gmail.com> and others"); 799 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver"); 800 MODULE_LICENSE("GPL"); 801