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 = simple_strtol(buf, NULL, 10); 208 209 mutex_lock(&data->update_lock); 210 data->temp_max[attr->index] = TEMP_TO_REG(val); 211 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index), 212 data->temp_max[attr->index]); 213 mutex_unlock(&data->update_lock); 214 return count; 215 } 216 217 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); 218 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, 219 show_max, set_max, 0); 220 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, 221 show_max, set_max, 1); 222 223 /* voltage */ 224 static ssize_t show_in(struct device *dev, struct device_attribute *devattr, 225 char *buf) 226 { 227 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 228 struct adm9240_data *data = adm9240_update_device(dev); 229 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index], 230 attr->index)); 231 } 232 233 static ssize_t show_in_min(struct device *dev, 234 struct device_attribute *devattr, char *buf) 235 { 236 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 237 struct adm9240_data *data = adm9240_update_device(dev); 238 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index], 239 attr->index)); 240 } 241 242 static ssize_t show_in_max(struct device *dev, 243 struct device_attribute *devattr, char *buf) 244 { 245 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 246 struct adm9240_data *data = adm9240_update_device(dev); 247 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index], 248 attr->index)); 249 } 250 251 static ssize_t set_in_min(struct device *dev, 252 struct device_attribute *devattr, 253 const char *buf, size_t count) 254 { 255 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 256 struct i2c_client *client = to_i2c_client(dev); 257 struct adm9240_data *data = i2c_get_clientdata(client); 258 unsigned long val = simple_strtoul(buf, NULL, 10); 259 260 mutex_lock(&data->update_lock); 261 data->in_min[attr->index] = IN_TO_REG(val, attr->index); 262 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index), 263 data->in_min[attr->index]); 264 mutex_unlock(&data->update_lock); 265 return count; 266 } 267 268 static ssize_t set_in_max(struct device *dev, 269 struct device_attribute *devattr, 270 const char *buf, size_t count) 271 { 272 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 273 struct i2c_client *client = to_i2c_client(dev); 274 struct adm9240_data *data = i2c_get_clientdata(client); 275 unsigned long val = simple_strtoul(buf, NULL, 10); 276 277 mutex_lock(&data->update_lock); 278 data->in_max[attr->index] = IN_TO_REG(val, attr->index); 279 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index), 280 data->in_max[attr->index]); 281 mutex_unlock(&data->update_lock); 282 return count; 283 } 284 285 #define vin(nr) \ 286 static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \ 287 show_in, NULL, nr); \ 288 static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \ 289 show_in_min, set_in_min, nr); \ 290 static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \ 291 show_in_max, set_in_max, nr); 292 293 vin(0); 294 vin(1); 295 vin(2); 296 vin(3); 297 vin(4); 298 vin(5); 299 300 /* fans */ 301 static ssize_t show_fan(struct device *dev, 302 struct device_attribute *devattr, char *buf) 303 { 304 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 305 struct adm9240_data *data = adm9240_update_device(dev); 306 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], 307 1 << data->fan_div[attr->index])); 308 } 309 310 static ssize_t show_fan_min(struct device *dev, 311 struct device_attribute *devattr, char *buf) 312 { 313 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 314 struct adm9240_data *data = adm9240_update_device(dev); 315 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index], 316 1 << data->fan_div[attr->index])); 317 } 318 319 static ssize_t show_fan_div(struct device *dev, 320 struct device_attribute *devattr, char *buf) 321 { 322 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 323 struct adm9240_data *data = adm9240_update_device(dev); 324 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]); 325 } 326 327 /* write new fan div, callers must hold data->update_lock */ 328 static void adm9240_write_fan_div(struct i2c_client *client, int nr, 329 u8 fan_div) 330 { 331 u8 reg, old, shift = (nr + 2) * 2; 332 333 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 334 old = (reg >> shift) & 3; 335 reg &= ~(3 << shift); 336 reg |= (fan_div << shift); 337 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg); 338 dev_dbg(&client->dev, "fan%d clock divider changed from %u " 339 "to %u\n", nr + 1, 1 << old, 1 << fan_div); 340 } 341 342 /* 343 * set fan speed low limit: 344 * 345 * - value is zero: disable fan speed low limit alarm 346 * 347 * - value is below fan speed measurement range: enable fan speed low 348 * limit alarm to be asserted while fan speed too slow to measure 349 * 350 * - otherwise: select fan clock divider to suit fan speed low limit, 351 * measurement code may adjust registers to ensure fan speed reading 352 */ 353 static ssize_t set_fan_min(struct device *dev, 354 struct device_attribute *devattr, 355 const char *buf, size_t count) 356 { 357 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 358 struct i2c_client *client = to_i2c_client(dev); 359 struct adm9240_data *data = i2c_get_clientdata(client); 360 unsigned long val = simple_strtoul(buf, NULL, 10); 361 int nr = attr->index; 362 u8 new_div; 363 364 mutex_lock(&data->update_lock); 365 366 if (!val) { 367 data->fan_min[nr] = 255; 368 new_div = data->fan_div[nr]; 369 370 dev_dbg(&client->dev, "fan%u low limit set disabled\n", 371 nr + 1); 372 373 } else if (val < 1350000 / (8 * 254)) { 374 new_div = 3; 375 data->fan_min[nr] = 254; 376 377 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n", 378 nr + 1, FAN_FROM_REG(254, 1 << new_div)); 379 380 } else { 381 unsigned int new_min = 1350000 / val; 382 383 new_div = 0; 384 while (new_min > 192 && new_div < 3) { 385 new_div++; 386 new_min /= 2; 387 } 388 if (!new_min) /* keep > 0 */ 389 new_min++; 390 391 data->fan_min[nr] = new_min; 392 393 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n", 394 nr + 1, FAN_FROM_REG(new_min, 1 << new_div)); 395 } 396 397 if (new_div != data->fan_div[nr]) { 398 data->fan_div[nr] = new_div; 399 adm9240_write_fan_div(client, nr, new_div); 400 } 401 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr), 402 data->fan_min[nr]); 403 404 mutex_unlock(&data->update_lock); 405 return count; 406 } 407 408 #define fan(nr) \ 409 static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \ 410 show_fan, NULL, nr - 1); \ 411 static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \ 412 show_fan_div, NULL, nr - 1); \ 413 static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \ 414 show_fan_min, set_fan_min, nr - 1); 415 416 fan(1); 417 fan(2); 418 419 /* alarms */ 420 static ssize_t show_alarms(struct device *dev, 421 struct device_attribute *attr, char *buf) 422 { 423 struct adm9240_data *data = adm9240_update_device(dev); 424 return sprintf(buf, "%u\n", data->alarms); 425 } 426 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 427 428 static ssize_t show_alarm(struct device *dev, 429 struct device_attribute *attr, char *buf) 430 { 431 int bitnr = to_sensor_dev_attr(attr)->index; 432 struct adm9240_data *data = adm9240_update_device(dev); 433 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 434 } 435 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 436 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 437 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); 438 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); 439 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); 440 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9); 441 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); 442 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6); 443 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); 444 445 /* vid */ 446 static ssize_t show_vid(struct device *dev, 447 struct device_attribute *attr, char *buf) 448 { 449 struct adm9240_data *data = adm9240_update_device(dev); 450 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 451 } 452 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 453 454 /* analog output */ 455 static ssize_t show_aout(struct device *dev, 456 struct device_attribute *attr, char *buf) 457 { 458 struct adm9240_data *data = adm9240_update_device(dev); 459 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 460 } 461 462 static ssize_t set_aout(struct device *dev, 463 struct device_attribute *attr, 464 const char *buf, size_t count) 465 { 466 struct i2c_client *client = to_i2c_client(dev); 467 struct adm9240_data *data = i2c_get_clientdata(client); 468 unsigned long val = simple_strtol(buf, NULL, 10); 469 470 mutex_lock(&data->update_lock); 471 data->aout = AOUT_TO_REG(val); 472 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout); 473 mutex_unlock(&data->update_lock); 474 return count; 475 } 476 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout); 477 478 /* chassis_clear */ 479 static ssize_t chassis_clear_legacy(struct device *dev, 480 struct device_attribute *attr, 481 const char *buf, size_t count) 482 { 483 struct i2c_client *client = to_i2c_client(dev); 484 unsigned long val = simple_strtol(buf, NULL, 10); 485 486 dev_warn(dev, "Attribute chassis_clear is deprecated, " 487 "use intrusion0_alarm instead\n"); 488 489 if (val == 1) { 490 i2c_smbus_write_byte_data(client, 491 ADM9240_REG_CHASSIS_CLEAR, 0x80); 492 dev_dbg(&client->dev, "chassis intrusion latch cleared\n"); 493 } 494 return count; 495 } 496 static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear_legacy); 497 498 static ssize_t chassis_clear(struct device *dev, 499 struct device_attribute *attr, 500 const char *buf, size_t count) 501 { 502 struct i2c_client *client = to_i2c_client(dev); 503 struct adm9240_data *data = i2c_get_clientdata(client); 504 unsigned long val; 505 506 if (strict_strtoul(buf, 10, &val) || val != 0) 507 return -EINVAL; 508 509 mutex_lock(&data->update_lock); 510 i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80); 511 data->valid = 0; /* Force cache refresh */ 512 mutex_unlock(&data->update_lock); 513 dev_dbg(&client->dev, "chassis intrusion latch cleared\n"); 514 515 return count; 516 } 517 static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm, 518 chassis_clear, 12); 519 520 static struct attribute *adm9240_attributes[] = { 521 &sensor_dev_attr_in0_input.dev_attr.attr, 522 &sensor_dev_attr_in0_min.dev_attr.attr, 523 &sensor_dev_attr_in0_max.dev_attr.attr, 524 &sensor_dev_attr_in0_alarm.dev_attr.attr, 525 &sensor_dev_attr_in1_input.dev_attr.attr, 526 &sensor_dev_attr_in1_min.dev_attr.attr, 527 &sensor_dev_attr_in1_max.dev_attr.attr, 528 &sensor_dev_attr_in1_alarm.dev_attr.attr, 529 &sensor_dev_attr_in2_input.dev_attr.attr, 530 &sensor_dev_attr_in2_min.dev_attr.attr, 531 &sensor_dev_attr_in2_max.dev_attr.attr, 532 &sensor_dev_attr_in2_alarm.dev_attr.attr, 533 &sensor_dev_attr_in3_input.dev_attr.attr, 534 &sensor_dev_attr_in3_min.dev_attr.attr, 535 &sensor_dev_attr_in3_max.dev_attr.attr, 536 &sensor_dev_attr_in3_alarm.dev_attr.attr, 537 &sensor_dev_attr_in4_input.dev_attr.attr, 538 &sensor_dev_attr_in4_min.dev_attr.attr, 539 &sensor_dev_attr_in4_max.dev_attr.attr, 540 &sensor_dev_attr_in4_alarm.dev_attr.attr, 541 &sensor_dev_attr_in5_input.dev_attr.attr, 542 &sensor_dev_attr_in5_min.dev_attr.attr, 543 &sensor_dev_attr_in5_max.dev_attr.attr, 544 &sensor_dev_attr_in5_alarm.dev_attr.attr, 545 &dev_attr_temp1_input.attr, 546 &sensor_dev_attr_temp1_max.dev_attr.attr, 547 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 548 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 549 &sensor_dev_attr_fan1_input.dev_attr.attr, 550 &sensor_dev_attr_fan1_div.dev_attr.attr, 551 &sensor_dev_attr_fan1_min.dev_attr.attr, 552 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 553 &sensor_dev_attr_fan2_input.dev_attr.attr, 554 &sensor_dev_attr_fan2_div.dev_attr.attr, 555 &sensor_dev_attr_fan2_min.dev_attr.attr, 556 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 557 &dev_attr_alarms.attr, 558 &dev_attr_aout_output.attr, 559 &dev_attr_chassis_clear.attr, 560 &sensor_dev_attr_intrusion0_alarm.dev_attr.attr, 561 &dev_attr_cpu0_vid.attr, 562 NULL 563 }; 564 565 static const struct attribute_group adm9240_group = { 566 .attrs = adm9240_attributes, 567 }; 568 569 570 /*** sensor chip detect and driver install ***/ 571 572 /* Return 0 if detection is successful, -ENODEV otherwise */ 573 static int adm9240_detect(struct i2c_client *new_client, 574 struct i2c_board_info *info) 575 { 576 struct i2c_adapter *adapter = new_client->adapter; 577 const char *name = ""; 578 int address = new_client->addr; 579 u8 man_id, die_rev; 580 581 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 582 return -ENODEV; 583 584 /* verify chip: reg address should match i2c address */ 585 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) 586 != address) { 587 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n", 588 address); 589 return -ENODEV; 590 } 591 592 /* check known chip manufacturer */ 593 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID); 594 if (man_id == 0x23) { 595 name = "adm9240"; 596 } else if (man_id == 0xda) { 597 name = "ds1780"; 598 } else if (man_id == 0x01) { 599 name = "lm81"; 600 } else { 601 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n", 602 man_id); 603 return -ENODEV; 604 } 605 606 /* successful detect, print chip info */ 607 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV); 608 dev_info(&adapter->dev, "found %s revision %u\n", 609 man_id == 0x23 ? "ADM9240" : 610 man_id == 0xda ? "DS1780" : "LM81", die_rev); 611 612 strlcpy(info->type, name, I2C_NAME_SIZE); 613 614 return 0; 615 } 616 617 static int adm9240_probe(struct i2c_client *new_client, 618 const struct i2c_device_id *id) 619 { 620 struct adm9240_data *data; 621 int err; 622 623 data = kzalloc(sizeof(*data), GFP_KERNEL); 624 if (!data) { 625 err = -ENOMEM; 626 goto exit; 627 } 628 629 i2c_set_clientdata(new_client, data); 630 mutex_init(&data->update_lock); 631 632 adm9240_init_client(new_client); 633 634 /* populate sysfs filesystem */ 635 if ((err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group))) 636 goto exit_free; 637 638 data->hwmon_dev = hwmon_device_register(&new_client->dev); 639 if (IS_ERR(data->hwmon_dev)) { 640 err = PTR_ERR(data->hwmon_dev); 641 goto exit_remove; 642 } 643 644 return 0; 645 646 exit_remove: 647 sysfs_remove_group(&new_client->dev.kobj, &adm9240_group); 648 exit_free: 649 kfree(data); 650 exit: 651 return err; 652 } 653 654 static int adm9240_remove(struct i2c_client *client) 655 { 656 struct adm9240_data *data = i2c_get_clientdata(client); 657 658 hwmon_device_unregister(data->hwmon_dev); 659 sysfs_remove_group(&client->dev.kobj, &adm9240_group); 660 661 kfree(data); 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 { 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, "cold start: config was 0x%02x " 704 "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 { 722 data->in[i] = i2c_smbus_read_byte_data(client, 723 ADM9240_REG_IN(i)); 724 } 725 data->alarms = i2c_smbus_read_byte_data(client, 726 ADM9240_REG_INT(0)) | 727 i2c_smbus_read_byte_data(client, 728 ADM9240_REG_INT(1)) << 8; 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 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 { 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 { 765 data->in_min[i] = i2c_smbus_read_byte_data(client, 766 ADM9240_REG_IN_MIN(i)); 767 data->in_max[i] = i2c_smbus_read_byte_data(client, 768 ADM9240_REG_IN_MAX(i)); 769 } 770 for (i = 0; i < 2; i++) 771 { 772 data->fan_min[i] = i2c_smbus_read_byte_data(client, 773 ADM9240_REG_FAN_MIN(i)); 774 } 775 data->temp_max[0] = i2c_smbus_read_byte_data(client, 776 ADM9240_REG_TEMP_MAX(0)); 777 data->temp_max[1] = i2c_smbus_read_byte_data(client, 778 ADM9240_REG_TEMP_MAX(1)); 779 780 /* read fan divs and 5-bit VID */ 781 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 782 data->fan_div[0] = (i >> 4) & 3; 783 data->fan_div[1] = (i >> 6) & 3; 784 data->vid = i & 0x0f; 785 data->vid |= (i2c_smbus_read_byte_data(client, 786 ADM9240_REG_VID4) & 1) << 4; 787 /* read analog out */ 788 data->aout = i2c_smbus_read_byte_data(client, 789 ADM9240_REG_ANALOG_OUT); 790 791 data->last_updated_config = jiffies; 792 data->valid = 1; 793 } 794 mutex_unlock(&data->update_lock); 795 return data; 796 } 797 798 static int __init sensors_adm9240_init(void) 799 { 800 return i2c_add_driver(&adm9240_driver); 801 } 802 803 static void __exit sensors_adm9240_exit(void) 804 { 805 i2c_del_driver(&adm9240_driver); 806 } 807 808 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, " 809 "Grant Coady <gcoady.lk@gmail.com> and others"); 810 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver"); 811 MODULE_LICENSE("GPL"); 812 813 module_init(sensors_adm9240_init); 814 module_exit(sensors_adm9240_exit); 815 816