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 clamp_val(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 clamp_val(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 clamp_val(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, 355 "fan%d clock divider changed from %u to %u\n", 356 nr + 1, 1 << old, 1 << fan_div); 357 } 358 359 /* 360 * set fan speed low limit: 361 * 362 * - value is zero: disable fan speed low limit alarm 363 * 364 * - value is below fan speed measurement range: enable fan speed low 365 * limit alarm to be asserted while fan speed too slow to measure 366 * 367 * - otherwise: select fan clock divider to suit fan speed low limit, 368 * measurement code may adjust registers to ensure fan speed reading 369 */ 370 static ssize_t set_fan_min(struct device *dev, 371 struct device_attribute *devattr, 372 const char *buf, size_t count) 373 { 374 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 375 struct i2c_client *client = to_i2c_client(dev); 376 struct adm9240_data *data = i2c_get_clientdata(client); 377 int nr = attr->index; 378 u8 new_div; 379 unsigned long val; 380 int err; 381 382 err = kstrtoul(buf, 10, &val); 383 if (err) 384 return err; 385 386 mutex_lock(&data->update_lock); 387 388 if (!val) { 389 data->fan_min[nr] = 255; 390 new_div = data->fan_div[nr]; 391 392 dev_dbg(&client->dev, "fan%u low limit set disabled\n", 393 nr + 1); 394 395 } else if (val < 1350000 / (8 * 254)) { 396 new_div = 3; 397 data->fan_min[nr] = 254; 398 399 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n", 400 nr + 1, FAN_FROM_REG(254, 1 << new_div)); 401 402 } else { 403 unsigned int new_min = 1350000 / val; 404 405 new_div = 0; 406 while (new_min > 192 && new_div < 3) { 407 new_div++; 408 new_min /= 2; 409 } 410 if (!new_min) /* keep > 0 */ 411 new_min++; 412 413 data->fan_min[nr] = new_min; 414 415 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n", 416 nr + 1, FAN_FROM_REG(new_min, 1 << new_div)); 417 } 418 419 if (new_div != data->fan_div[nr]) { 420 data->fan_div[nr] = new_div; 421 adm9240_write_fan_div(client, nr, new_div); 422 } 423 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr), 424 data->fan_min[nr]); 425 426 mutex_unlock(&data->update_lock); 427 return count; 428 } 429 430 #define fan(nr) \ 431 static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \ 432 show_fan, NULL, nr - 1); \ 433 static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \ 434 show_fan_div, NULL, nr - 1); \ 435 static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \ 436 show_fan_min, set_fan_min, nr - 1); 437 438 fan(1); 439 fan(2); 440 441 /* alarms */ 442 static ssize_t show_alarms(struct device *dev, 443 struct device_attribute *attr, char *buf) 444 { 445 struct adm9240_data *data = adm9240_update_device(dev); 446 return sprintf(buf, "%u\n", data->alarms); 447 } 448 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 449 450 static ssize_t show_alarm(struct device *dev, 451 struct device_attribute *attr, char *buf) 452 { 453 int bitnr = to_sensor_dev_attr(attr)->index; 454 struct adm9240_data *data = adm9240_update_device(dev); 455 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 456 } 457 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 458 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 459 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); 460 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); 461 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); 462 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9); 463 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); 464 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6); 465 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); 466 467 /* vid */ 468 static ssize_t show_vid(struct device *dev, 469 struct device_attribute *attr, char *buf) 470 { 471 struct adm9240_data *data = adm9240_update_device(dev); 472 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 473 } 474 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 475 476 /* analog output */ 477 static ssize_t show_aout(struct device *dev, 478 struct device_attribute *attr, char *buf) 479 { 480 struct adm9240_data *data = adm9240_update_device(dev); 481 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 482 } 483 484 static ssize_t set_aout(struct device *dev, 485 struct device_attribute *attr, 486 const char *buf, size_t count) 487 { 488 struct i2c_client *client = to_i2c_client(dev); 489 struct adm9240_data *data = i2c_get_clientdata(client); 490 long val; 491 int err; 492 493 err = kstrtol(buf, 10, &val); 494 if (err) 495 return err; 496 497 mutex_lock(&data->update_lock); 498 data->aout = AOUT_TO_REG(val); 499 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout); 500 mutex_unlock(&data->update_lock); 501 return count; 502 } 503 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout); 504 505 static ssize_t chassis_clear(struct device *dev, 506 struct device_attribute *attr, 507 const char *buf, size_t count) 508 { 509 struct i2c_client *client = to_i2c_client(dev); 510 struct adm9240_data *data = i2c_get_clientdata(client); 511 unsigned long val; 512 513 if (kstrtoul(buf, 10, &val) || val != 0) 514 return -EINVAL; 515 516 mutex_lock(&data->update_lock); 517 i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80); 518 data->valid = 0; /* Force cache refresh */ 519 mutex_unlock(&data->update_lock); 520 dev_dbg(&client->dev, "chassis intrusion latch cleared\n"); 521 522 return count; 523 } 524 static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm, 525 chassis_clear, 12); 526 527 static struct attribute *adm9240_attributes[] = { 528 &sensor_dev_attr_in0_input.dev_attr.attr, 529 &sensor_dev_attr_in0_min.dev_attr.attr, 530 &sensor_dev_attr_in0_max.dev_attr.attr, 531 &sensor_dev_attr_in0_alarm.dev_attr.attr, 532 &sensor_dev_attr_in1_input.dev_attr.attr, 533 &sensor_dev_attr_in1_min.dev_attr.attr, 534 &sensor_dev_attr_in1_max.dev_attr.attr, 535 &sensor_dev_attr_in1_alarm.dev_attr.attr, 536 &sensor_dev_attr_in2_input.dev_attr.attr, 537 &sensor_dev_attr_in2_min.dev_attr.attr, 538 &sensor_dev_attr_in2_max.dev_attr.attr, 539 &sensor_dev_attr_in2_alarm.dev_attr.attr, 540 &sensor_dev_attr_in3_input.dev_attr.attr, 541 &sensor_dev_attr_in3_min.dev_attr.attr, 542 &sensor_dev_attr_in3_max.dev_attr.attr, 543 &sensor_dev_attr_in3_alarm.dev_attr.attr, 544 &sensor_dev_attr_in4_input.dev_attr.attr, 545 &sensor_dev_attr_in4_min.dev_attr.attr, 546 &sensor_dev_attr_in4_max.dev_attr.attr, 547 &sensor_dev_attr_in4_alarm.dev_attr.attr, 548 &sensor_dev_attr_in5_input.dev_attr.attr, 549 &sensor_dev_attr_in5_min.dev_attr.attr, 550 &sensor_dev_attr_in5_max.dev_attr.attr, 551 &sensor_dev_attr_in5_alarm.dev_attr.attr, 552 &dev_attr_temp1_input.attr, 553 &sensor_dev_attr_temp1_max.dev_attr.attr, 554 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 555 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 556 &sensor_dev_attr_fan1_input.dev_attr.attr, 557 &sensor_dev_attr_fan1_div.dev_attr.attr, 558 &sensor_dev_attr_fan1_min.dev_attr.attr, 559 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 560 &sensor_dev_attr_fan2_input.dev_attr.attr, 561 &sensor_dev_attr_fan2_div.dev_attr.attr, 562 &sensor_dev_attr_fan2_min.dev_attr.attr, 563 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 564 &dev_attr_alarms.attr, 565 &dev_attr_aout_output.attr, 566 &sensor_dev_attr_intrusion0_alarm.dev_attr.attr, 567 &dev_attr_cpu0_vid.attr, 568 NULL 569 }; 570 571 static const struct attribute_group adm9240_group = { 572 .attrs = adm9240_attributes, 573 }; 574 575 576 /*** sensor chip detect and driver install ***/ 577 578 /* Return 0 if detection is successful, -ENODEV otherwise */ 579 static int adm9240_detect(struct i2c_client *new_client, 580 struct i2c_board_info *info) 581 { 582 struct i2c_adapter *adapter = new_client->adapter; 583 const char *name = ""; 584 int address = new_client->addr; 585 u8 man_id, die_rev; 586 587 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 588 return -ENODEV; 589 590 /* verify chip: reg address should match i2c address */ 591 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) 592 != address) { 593 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n", 594 address); 595 return -ENODEV; 596 } 597 598 /* check known chip manufacturer */ 599 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID); 600 if (man_id == 0x23) { 601 name = "adm9240"; 602 } else if (man_id == 0xda) { 603 name = "ds1780"; 604 } else if (man_id == 0x01) { 605 name = "lm81"; 606 } else { 607 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n", 608 man_id); 609 return -ENODEV; 610 } 611 612 /* successful detect, print chip info */ 613 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV); 614 dev_info(&adapter->dev, "found %s revision %u\n", 615 man_id == 0x23 ? "ADM9240" : 616 man_id == 0xda ? "DS1780" : "LM81", die_rev); 617 618 strlcpy(info->type, name, I2C_NAME_SIZE); 619 620 return 0; 621 } 622 623 static int adm9240_probe(struct i2c_client *new_client, 624 const struct i2c_device_id *id) 625 { 626 struct adm9240_data *data; 627 int err; 628 629 data = devm_kzalloc(&new_client->dev, sizeof(*data), GFP_KERNEL); 630 if (!data) 631 return -ENOMEM; 632 633 i2c_set_clientdata(new_client, data); 634 mutex_init(&data->update_lock); 635 636 adm9240_init_client(new_client); 637 638 /* populate sysfs filesystem */ 639 err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group); 640 if (err) 641 return err; 642 643 data->hwmon_dev = hwmon_device_register(&new_client->dev); 644 if (IS_ERR(data->hwmon_dev)) { 645 err = PTR_ERR(data->hwmon_dev); 646 goto exit_remove; 647 } 648 649 return 0; 650 651 exit_remove: 652 sysfs_remove_group(&new_client->dev.kobj, &adm9240_group); 653 return err; 654 } 655 656 static int adm9240_remove(struct i2c_client *client) 657 { 658 struct adm9240_data *data = i2c_get_clientdata(client); 659 660 hwmon_device_unregister(data->hwmon_dev); 661 sysfs_remove_group(&client->dev.kobj, &adm9240_group); 662 663 return 0; 664 } 665 666 static void adm9240_init_client(struct i2c_client *client) 667 { 668 struct adm9240_data *data = i2c_get_clientdata(client); 669 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG); 670 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3; 671 672 data->vrm = vid_which_vrm(); /* need this to report vid as mV */ 673 674 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10, 675 data->vrm % 10); 676 677 if (conf & 1) { /* measurement cycle running: report state */ 678 679 dev_info(&client->dev, "status: config 0x%02x mode %u\n", 680 conf, mode); 681 682 } else { /* cold start: open limits before starting chip */ 683 int i; 684 685 for (i = 0; i < 6; i++) { 686 i2c_smbus_write_byte_data(client, 687 ADM9240_REG_IN_MIN(i), 0); 688 i2c_smbus_write_byte_data(client, 689 ADM9240_REG_IN_MAX(i), 255); 690 } 691 i2c_smbus_write_byte_data(client, 692 ADM9240_REG_FAN_MIN(0), 255); 693 i2c_smbus_write_byte_data(client, 694 ADM9240_REG_FAN_MIN(1), 255); 695 i2c_smbus_write_byte_data(client, 696 ADM9240_REG_TEMP_MAX(0), 127); 697 i2c_smbus_write_byte_data(client, 698 ADM9240_REG_TEMP_MAX(1), 127); 699 700 /* start measurement cycle */ 701 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1); 702 703 dev_info(&client->dev, 704 "cold start: config was 0x%02x mode %u\n", conf, mode); 705 } 706 } 707 708 static struct adm9240_data *adm9240_update_device(struct device *dev) 709 { 710 struct i2c_client *client = to_i2c_client(dev); 711 struct adm9240_data *data = i2c_get_clientdata(client); 712 int i; 713 714 mutex_lock(&data->update_lock); 715 716 /* minimum measurement cycle: 1.75 seconds */ 717 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4)) 718 || !data->valid) { 719 720 for (i = 0; i < 6; i++) { /* read voltages */ 721 data->in[i] = i2c_smbus_read_byte_data(client, 722 ADM9240_REG_IN(i)); 723 } 724 data->alarms = i2c_smbus_read_byte_data(client, 725 ADM9240_REG_INT(0)) | 726 i2c_smbus_read_byte_data(client, 727 ADM9240_REG_INT(1)) << 8; 728 729 /* 730 * read temperature: assume temperature changes less than 731 * 0.5'C per two measurement cycles thus ignore possible 732 * but unlikely aliasing error on lsb reading. --Grant 733 */ 734 data->temp = ((i2c_smbus_read_byte_data(client, 735 ADM9240_REG_TEMP) << 8) | 736 i2c_smbus_read_byte_data(client, 737 ADM9240_REG_TEMP_CONF)) / 128; 738 739 for (i = 0; i < 2; i++) { /* read fans */ 740 data->fan[i] = i2c_smbus_read_byte_data(client, 741 ADM9240_REG_FAN(i)); 742 743 /* adjust fan clock divider on overflow */ 744 if (data->valid && data->fan[i] == 255 && 745 data->fan_div[i] < 3) { 746 747 adm9240_write_fan_div(client, i, 748 ++data->fan_div[i]); 749 750 /* adjust fan_min if active, but not to 0 */ 751 if (data->fan_min[i] < 255 && 752 data->fan_min[i] >= 2) 753 data->fan_min[i] /= 2; 754 } 755 } 756 data->last_updated_measure = jiffies; 757 } 758 759 /* minimum config reading cycle: 300 seconds */ 760 if (time_after(jiffies, data->last_updated_config + (HZ * 300)) 761 || !data->valid) { 762 763 for (i = 0; i < 6; i++) { 764 data->in_min[i] = i2c_smbus_read_byte_data(client, 765 ADM9240_REG_IN_MIN(i)); 766 data->in_max[i] = i2c_smbus_read_byte_data(client, 767 ADM9240_REG_IN_MAX(i)); 768 } 769 for (i = 0; i < 2; i++) { 770 data->fan_min[i] = i2c_smbus_read_byte_data(client, 771 ADM9240_REG_FAN_MIN(i)); 772 } 773 data->temp_max[0] = i2c_smbus_read_byte_data(client, 774 ADM9240_REG_TEMP_MAX(0)); 775 data->temp_max[1] = i2c_smbus_read_byte_data(client, 776 ADM9240_REG_TEMP_MAX(1)); 777 778 /* read fan divs and 5-bit VID */ 779 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 780 data->fan_div[0] = (i >> 4) & 3; 781 data->fan_div[1] = (i >> 6) & 3; 782 data->vid = i & 0x0f; 783 data->vid |= (i2c_smbus_read_byte_data(client, 784 ADM9240_REG_VID4) & 1) << 4; 785 /* read analog out */ 786 data->aout = i2c_smbus_read_byte_data(client, 787 ADM9240_REG_ANALOG_OUT); 788 789 data->last_updated_config = jiffies; 790 data->valid = 1; 791 } 792 mutex_unlock(&data->update_lock); 793 return data; 794 } 795 796 module_i2c_driver(adm9240_driver); 797 798 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, " 799 "Grant Coady <gcoady.lk@gmail.com> and others"); 800 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver"); 801 MODULE_LICENSE("GPL"); 802