1 /* 2 * adm9240.c Part of lm_sensors, Linux kernel modules for hardware 3 * monitoring 4 * 5 * Copyright (C) 1999 Frodo Looijaard <frodol@dds.nl> 6 * Philip Edelbrock <phil@netroedge.com> 7 * Copyright (C) 2003 Michiel Rook <michiel@grendelproject.nl> 8 * Copyright (C) 2005 Grant Coady <gcoady.lk@gmail.com> with valuable 9 * guidance from Jean Delvare 10 * 11 * Driver supports Analog Devices ADM9240 12 * Dallas Semiconductor DS1780 13 * National Semiconductor LM81 14 * 15 * ADM9240 is the reference, DS1780 and LM81 are register compatibles 16 * 17 * Voltage Six inputs are scaled by chip, VID also reported 18 * Temperature Chip temperature to 0.5'C, maximum and max_hysteris 19 * Fans 2 fans, low speed alarm, automatic fan clock divider 20 * Alarms 16-bit map of active alarms 21 * Analog Out 0..1250 mV output 22 * 23 * Chassis Intrusion: clear CI latch with 'echo 1 > chassis_clear' 24 * 25 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant 26 * 27 * LM81 extended temp reading not implemented 28 * 29 * This program is free software; you can redistribute it and/or modify 30 * it under the terms of the GNU General Public License as published by 31 * the Free Software Foundation; either version 2 of the License, or 32 * (at your option) any later version. 33 * 34 * This program is distributed in the hope that it will be useful, 35 * but WITHOUT ANY WARRANTY; without even the implied warranty of 36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 37 * GNU General Public License for more details. 38 * 39 * You should have received a copy of the GNU General Public License 40 * along with this program; if not, write to the Free Software 41 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 42 */ 43 44 #include <linux/init.h> 45 #include <linux/module.h> 46 #include <linux/slab.h> 47 #include <linux/i2c.h> 48 #include <linux/hwmon-sysfs.h> 49 #include <linux/hwmon.h> 50 #include <linux/hwmon-vid.h> 51 #include <linux/err.h> 52 #include <linux/mutex.h> 53 54 /* Addresses to scan */ 55 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f, 56 I2C_CLIENT_END }; 57 58 /* Insmod parameters */ 59 I2C_CLIENT_INSMOD_3(adm9240, ds1780, lm81); 60 61 /* ADM9240 registers */ 62 #define ADM9240_REG_MAN_ID 0x3e 63 #define ADM9240_REG_DIE_REV 0x3f 64 #define ADM9240_REG_CONFIG 0x40 65 66 #define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */ 67 #define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2) 68 #define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2) 69 #define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */ 70 #define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr)) 71 #define ADM9240_REG_INT(nr) (0x41 + (nr)) 72 #define ADM9240_REG_INT_MASK(nr) (0x43 + (nr)) 73 #define ADM9240_REG_TEMP 0x27 74 #define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */ 75 #define ADM9240_REG_ANALOG_OUT 0x19 76 #define ADM9240_REG_CHASSIS_CLEAR 0x46 77 #define ADM9240_REG_VID_FAN_DIV 0x47 78 #define ADM9240_REG_I2C_ADDR 0x48 79 #define ADM9240_REG_VID4 0x49 80 #define ADM9240_REG_TEMP_CONF 0x4b 81 82 /* generalised scaling with integer rounding */ 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, int kind, 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_data = &addr_data, 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 = simple_strtol(buf, NULL, 10); 209 210 mutex_lock(&data->update_lock); 211 data->temp_max[attr->index] = TEMP_TO_REG(val); 212 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index), 213 data->temp_max[attr->index]); 214 mutex_unlock(&data->update_lock); 215 return count; 216 } 217 218 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); 219 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, 220 show_max, set_max, 0); 221 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, 222 show_max, set_max, 1); 223 224 /* voltage */ 225 static ssize_t show_in(struct device *dev, struct device_attribute *devattr, 226 char *buf) 227 { 228 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 229 struct adm9240_data *data = adm9240_update_device(dev); 230 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index], 231 attr->index)); 232 } 233 234 static ssize_t show_in_min(struct device *dev, 235 struct device_attribute *devattr, char *buf) 236 { 237 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 238 struct adm9240_data *data = adm9240_update_device(dev); 239 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index], 240 attr->index)); 241 } 242 243 static ssize_t show_in_max(struct device *dev, 244 struct device_attribute *devattr, char *buf) 245 { 246 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 247 struct adm9240_data *data = adm9240_update_device(dev); 248 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index], 249 attr->index)); 250 } 251 252 static ssize_t set_in_min(struct device *dev, 253 struct device_attribute *devattr, 254 const char *buf, size_t count) 255 { 256 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 257 struct i2c_client *client = to_i2c_client(dev); 258 struct adm9240_data *data = i2c_get_clientdata(client); 259 unsigned long val = simple_strtoul(buf, NULL, 10); 260 261 mutex_lock(&data->update_lock); 262 data->in_min[attr->index] = IN_TO_REG(val, attr->index); 263 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index), 264 data->in_min[attr->index]); 265 mutex_unlock(&data->update_lock); 266 return count; 267 } 268 269 static ssize_t set_in_max(struct device *dev, 270 struct device_attribute *devattr, 271 const char *buf, size_t count) 272 { 273 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 274 struct i2c_client *client = to_i2c_client(dev); 275 struct adm9240_data *data = i2c_get_clientdata(client); 276 unsigned long val = simple_strtoul(buf, NULL, 10); 277 278 mutex_lock(&data->update_lock); 279 data->in_max[attr->index] = IN_TO_REG(val, attr->index); 280 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index), 281 data->in_max[attr->index]); 282 mutex_unlock(&data->update_lock); 283 return count; 284 } 285 286 #define vin(nr) \ 287 static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \ 288 show_in, NULL, nr); \ 289 static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \ 290 show_in_min, set_in_min, nr); \ 291 static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \ 292 show_in_max, set_in_max, nr); 293 294 vin(0); 295 vin(1); 296 vin(2); 297 vin(3); 298 vin(4); 299 vin(5); 300 301 /* fans */ 302 static ssize_t show_fan(struct device *dev, 303 struct device_attribute *devattr, char *buf) 304 { 305 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 306 struct adm9240_data *data = adm9240_update_device(dev); 307 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], 308 1 << data->fan_div[attr->index])); 309 } 310 311 static ssize_t show_fan_min(struct device *dev, 312 struct device_attribute *devattr, char *buf) 313 { 314 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 315 struct adm9240_data *data = adm9240_update_device(dev); 316 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index], 317 1 << data->fan_div[attr->index])); 318 } 319 320 static ssize_t show_fan_div(struct device *dev, 321 struct device_attribute *devattr, char *buf) 322 { 323 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 324 struct adm9240_data *data = adm9240_update_device(dev); 325 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]); 326 } 327 328 /* write new fan div, callers must hold data->update_lock */ 329 static void adm9240_write_fan_div(struct i2c_client *client, int nr, 330 u8 fan_div) 331 { 332 u8 reg, old, shift = (nr + 2) * 2; 333 334 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 335 old = (reg >> shift) & 3; 336 reg &= ~(3 << shift); 337 reg |= (fan_div << shift); 338 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg); 339 dev_dbg(&client->dev, "fan%d clock divider changed from %u " 340 "to %u\n", nr + 1, 1 << old, 1 << fan_div); 341 } 342 343 /* 344 * set fan speed low limit: 345 * 346 * - value is zero: disable fan speed low limit alarm 347 * 348 * - value is below fan speed measurement range: enable fan speed low 349 * limit alarm to be asserted while fan speed too slow to measure 350 * 351 * - otherwise: select fan clock divider to suit fan speed low limit, 352 * measurement code may adjust registers to ensure fan speed reading 353 */ 354 static ssize_t set_fan_min(struct device *dev, 355 struct device_attribute *devattr, 356 const char *buf, size_t count) 357 { 358 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 359 struct i2c_client *client = to_i2c_client(dev); 360 struct adm9240_data *data = i2c_get_clientdata(client); 361 unsigned long val = simple_strtoul(buf, NULL, 10); 362 int nr = attr->index; 363 u8 new_div; 364 365 mutex_lock(&data->update_lock); 366 367 if (!val) { 368 data->fan_min[nr] = 255; 369 new_div = data->fan_div[nr]; 370 371 dev_dbg(&client->dev, "fan%u low limit set disabled\n", 372 nr + 1); 373 374 } else if (val < 1350000 / (8 * 254)) { 375 new_div = 3; 376 data->fan_min[nr] = 254; 377 378 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n", 379 nr + 1, FAN_FROM_REG(254, 1 << new_div)); 380 381 } else { 382 unsigned int new_min = 1350000 / val; 383 384 new_div = 0; 385 while (new_min > 192 && new_div < 3) { 386 new_div++; 387 new_min /= 2; 388 } 389 if (!new_min) /* keep > 0 */ 390 new_min++; 391 392 data->fan_min[nr] = new_min; 393 394 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n", 395 nr + 1, FAN_FROM_REG(new_min, 1 << new_div)); 396 } 397 398 if (new_div != data->fan_div[nr]) { 399 data->fan_div[nr] = new_div; 400 adm9240_write_fan_div(client, nr, new_div); 401 } 402 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr), 403 data->fan_min[nr]); 404 405 mutex_unlock(&data->update_lock); 406 return count; 407 } 408 409 #define fan(nr) \ 410 static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \ 411 show_fan, NULL, nr - 1); \ 412 static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \ 413 show_fan_div, NULL, nr - 1); \ 414 static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \ 415 show_fan_min, set_fan_min, nr - 1); 416 417 fan(1); 418 fan(2); 419 420 /* alarms */ 421 static ssize_t show_alarms(struct device *dev, 422 struct device_attribute *attr, char *buf) 423 { 424 struct adm9240_data *data = adm9240_update_device(dev); 425 return sprintf(buf, "%u\n", data->alarms); 426 } 427 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 428 429 static ssize_t show_alarm(struct device *dev, 430 struct device_attribute *attr, char *buf) 431 { 432 int bitnr = to_sensor_dev_attr(attr)->index; 433 struct adm9240_data *data = adm9240_update_device(dev); 434 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 435 } 436 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 437 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 438 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); 439 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); 440 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); 441 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9); 442 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); 443 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6); 444 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); 445 446 /* vid */ 447 static ssize_t show_vid(struct device *dev, 448 struct device_attribute *attr, char *buf) 449 { 450 struct adm9240_data *data = adm9240_update_device(dev); 451 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 452 } 453 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 454 455 /* analog output */ 456 static ssize_t show_aout(struct device *dev, 457 struct device_attribute *attr, char *buf) 458 { 459 struct adm9240_data *data = adm9240_update_device(dev); 460 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 461 } 462 463 static ssize_t set_aout(struct device *dev, 464 struct device_attribute *attr, 465 const char *buf, size_t count) 466 { 467 struct i2c_client *client = to_i2c_client(dev); 468 struct adm9240_data *data = i2c_get_clientdata(client); 469 unsigned long val = simple_strtol(buf, NULL, 10); 470 471 mutex_lock(&data->update_lock); 472 data->aout = AOUT_TO_REG(val); 473 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout); 474 mutex_unlock(&data->update_lock); 475 return count; 476 } 477 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout); 478 479 /* chassis_clear */ 480 static ssize_t chassis_clear(struct device *dev, 481 struct device_attribute *attr, 482 const char *buf, size_t count) 483 { 484 struct i2c_client *client = to_i2c_client(dev); 485 unsigned long val = simple_strtol(buf, NULL, 10); 486 487 if (val == 1) { 488 i2c_smbus_write_byte_data(client, 489 ADM9240_REG_CHASSIS_CLEAR, 0x80); 490 dev_dbg(&client->dev, "chassis intrusion latch cleared\n"); 491 } 492 return count; 493 } 494 static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear); 495 496 static struct attribute *adm9240_attributes[] = { 497 &sensor_dev_attr_in0_input.dev_attr.attr, 498 &sensor_dev_attr_in0_min.dev_attr.attr, 499 &sensor_dev_attr_in0_max.dev_attr.attr, 500 &sensor_dev_attr_in0_alarm.dev_attr.attr, 501 &sensor_dev_attr_in1_input.dev_attr.attr, 502 &sensor_dev_attr_in1_min.dev_attr.attr, 503 &sensor_dev_attr_in1_max.dev_attr.attr, 504 &sensor_dev_attr_in1_alarm.dev_attr.attr, 505 &sensor_dev_attr_in2_input.dev_attr.attr, 506 &sensor_dev_attr_in2_min.dev_attr.attr, 507 &sensor_dev_attr_in2_max.dev_attr.attr, 508 &sensor_dev_attr_in2_alarm.dev_attr.attr, 509 &sensor_dev_attr_in3_input.dev_attr.attr, 510 &sensor_dev_attr_in3_min.dev_attr.attr, 511 &sensor_dev_attr_in3_max.dev_attr.attr, 512 &sensor_dev_attr_in3_alarm.dev_attr.attr, 513 &sensor_dev_attr_in4_input.dev_attr.attr, 514 &sensor_dev_attr_in4_min.dev_attr.attr, 515 &sensor_dev_attr_in4_max.dev_attr.attr, 516 &sensor_dev_attr_in4_alarm.dev_attr.attr, 517 &sensor_dev_attr_in5_input.dev_attr.attr, 518 &sensor_dev_attr_in5_min.dev_attr.attr, 519 &sensor_dev_attr_in5_max.dev_attr.attr, 520 &sensor_dev_attr_in5_alarm.dev_attr.attr, 521 &dev_attr_temp1_input.attr, 522 &sensor_dev_attr_temp1_max.dev_attr.attr, 523 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 524 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 525 &sensor_dev_attr_fan1_input.dev_attr.attr, 526 &sensor_dev_attr_fan1_div.dev_attr.attr, 527 &sensor_dev_attr_fan1_min.dev_attr.attr, 528 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 529 &sensor_dev_attr_fan2_input.dev_attr.attr, 530 &sensor_dev_attr_fan2_div.dev_attr.attr, 531 &sensor_dev_attr_fan2_min.dev_attr.attr, 532 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 533 &dev_attr_alarms.attr, 534 &dev_attr_aout_output.attr, 535 &dev_attr_chassis_clear.attr, 536 &dev_attr_cpu0_vid.attr, 537 NULL 538 }; 539 540 static const struct attribute_group adm9240_group = { 541 .attrs = adm9240_attributes, 542 }; 543 544 545 /*** sensor chip detect and driver install ***/ 546 547 /* Return 0 if detection is successful, -ENODEV otherwise */ 548 static int adm9240_detect(struct i2c_client *new_client, int kind, 549 struct i2c_board_info *info) 550 { 551 struct i2c_adapter *adapter = new_client->adapter; 552 const char *name = ""; 553 int address = new_client->addr; 554 u8 man_id, die_rev; 555 556 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 557 return -ENODEV; 558 559 if (kind == 0) { 560 kind = adm9240; 561 } 562 563 if (kind < 0) { 564 565 /* verify chip: reg address should match i2c address */ 566 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) 567 != address) { 568 dev_err(&adapter->dev, "detect fail: address match, " 569 "0x%02x\n", address); 570 return -ENODEV; 571 } 572 573 /* check known chip manufacturer */ 574 man_id = i2c_smbus_read_byte_data(new_client, 575 ADM9240_REG_MAN_ID); 576 if (man_id == 0x23) { 577 kind = adm9240; 578 } else if (man_id == 0xda) { 579 kind = ds1780; 580 } else if (man_id == 0x01) { 581 kind = lm81; 582 } else { 583 dev_err(&adapter->dev, "detect fail: unknown manuf, " 584 "0x%02x\n", man_id); 585 return -ENODEV; 586 } 587 588 /* successful detect, print chip info */ 589 die_rev = i2c_smbus_read_byte_data(new_client, 590 ADM9240_REG_DIE_REV); 591 dev_info(&adapter->dev, "found %s revision %u\n", 592 man_id == 0x23 ? "ADM9240" : 593 man_id == 0xda ? "DS1780" : "LM81", die_rev); 594 } 595 596 /* either forced or detected chip kind */ 597 if (kind == adm9240) { 598 name = "adm9240"; 599 } else if (kind == ds1780) { 600 name = "ds1780"; 601 } else if (kind == lm81) { 602 name = "lm81"; 603 } 604 strlcpy(info->type, name, I2C_NAME_SIZE); 605 606 return 0; 607 } 608 609 static int adm9240_probe(struct i2c_client *new_client, 610 const struct i2c_device_id *id) 611 { 612 struct adm9240_data *data; 613 int err; 614 615 data = kzalloc(sizeof(*data), GFP_KERNEL); 616 if (!data) { 617 err = -ENOMEM; 618 goto exit; 619 } 620 621 i2c_set_clientdata(new_client, data); 622 mutex_init(&data->update_lock); 623 624 adm9240_init_client(new_client); 625 626 /* populate sysfs filesystem */ 627 if ((err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group))) 628 goto exit_free; 629 630 data->hwmon_dev = hwmon_device_register(&new_client->dev); 631 if (IS_ERR(data->hwmon_dev)) { 632 err = PTR_ERR(data->hwmon_dev); 633 goto exit_remove; 634 } 635 636 return 0; 637 638 exit_remove: 639 sysfs_remove_group(&new_client->dev.kobj, &adm9240_group); 640 exit_free: 641 kfree(data); 642 exit: 643 return err; 644 } 645 646 static int adm9240_remove(struct i2c_client *client) 647 { 648 struct adm9240_data *data = i2c_get_clientdata(client); 649 650 hwmon_device_unregister(data->hwmon_dev); 651 sysfs_remove_group(&client->dev.kobj, &adm9240_group); 652 653 kfree(data); 654 return 0; 655 } 656 657 static void adm9240_init_client(struct i2c_client *client) 658 { 659 struct adm9240_data *data = i2c_get_clientdata(client); 660 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG); 661 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3; 662 663 data->vrm = vid_which_vrm(); /* need this to report vid as mV */ 664 665 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10, 666 data->vrm % 10); 667 668 if (conf & 1) { /* measurement cycle running: report state */ 669 670 dev_info(&client->dev, "status: config 0x%02x mode %u\n", 671 conf, mode); 672 673 } else { /* cold start: open limits before starting chip */ 674 int i; 675 676 for (i = 0; i < 6; i++) 677 { 678 i2c_smbus_write_byte_data(client, 679 ADM9240_REG_IN_MIN(i), 0); 680 i2c_smbus_write_byte_data(client, 681 ADM9240_REG_IN_MAX(i), 255); 682 } 683 i2c_smbus_write_byte_data(client, 684 ADM9240_REG_FAN_MIN(0), 255); 685 i2c_smbus_write_byte_data(client, 686 ADM9240_REG_FAN_MIN(1), 255); 687 i2c_smbus_write_byte_data(client, 688 ADM9240_REG_TEMP_MAX(0), 127); 689 i2c_smbus_write_byte_data(client, 690 ADM9240_REG_TEMP_MAX(1), 127); 691 692 /* start measurement cycle */ 693 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1); 694 695 dev_info(&client->dev, "cold start: config was 0x%02x " 696 "mode %u\n", conf, mode); 697 } 698 } 699 700 static struct adm9240_data *adm9240_update_device(struct device *dev) 701 { 702 struct i2c_client *client = to_i2c_client(dev); 703 struct adm9240_data *data = i2c_get_clientdata(client); 704 int i; 705 706 mutex_lock(&data->update_lock); 707 708 /* minimum measurement cycle: 1.75 seconds */ 709 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4)) 710 || !data->valid) { 711 712 for (i = 0; i < 6; i++) /* read voltages */ 713 { 714 data->in[i] = i2c_smbus_read_byte_data(client, 715 ADM9240_REG_IN(i)); 716 } 717 data->alarms = i2c_smbus_read_byte_data(client, 718 ADM9240_REG_INT(0)) | 719 i2c_smbus_read_byte_data(client, 720 ADM9240_REG_INT(1)) << 8; 721 722 /* read temperature: assume temperature changes less than 723 * 0.5'C per two measurement cycles thus ignore possible 724 * but unlikely aliasing error on lsb reading. --Grant */ 725 data->temp = ((i2c_smbus_read_byte_data(client, 726 ADM9240_REG_TEMP) << 8) | 727 i2c_smbus_read_byte_data(client, 728 ADM9240_REG_TEMP_CONF)) / 128; 729 730 for (i = 0; i < 2; i++) /* read fans */ 731 { 732 data->fan[i] = i2c_smbus_read_byte_data(client, 733 ADM9240_REG_FAN(i)); 734 735 /* adjust fan clock divider on overflow */ 736 if (data->valid && data->fan[i] == 255 && 737 data->fan_div[i] < 3) { 738 739 adm9240_write_fan_div(client, i, 740 ++data->fan_div[i]); 741 742 /* adjust fan_min if active, but not to 0 */ 743 if (data->fan_min[i] < 255 && 744 data->fan_min[i] >= 2) 745 data->fan_min[i] /= 2; 746 } 747 } 748 data->last_updated_measure = jiffies; 749 } 750 751 /* minimum config reading cycle: 300 seconds */ 752 if (time_after(jiffies, data->last_updated_config + (HZ * 300)) 753 || !data->valid) { 754 755 for (i = 0; i < 6; i++) 756 { 757 data->in_min[i] = i2c_smbus_read_byte_data(client, 758 ADM9240_REG_IN_MIN(i)); 759 data->in_max[i] = i2c_smbus_read_byte_data(client, 760 ADM9240_REG_IN_MAX(i)); 761 } 762 for (i = 0; i < 2; i++) 763 { 764 data->fan_min[i] = i2c_smbus_read_byte_data(client, 765 ADM9240_REG_FAN_MIN(i)); 766 } 767 data->temp_max[0] = i2c_smbus_read_byte_data(client, 768 ADM9240_REG_TEMP_MAX(0)); 769 data->temp_max[1] = i2c_smbus_read_byte_data(client, 770 ADM9240_REG_TEMP_MAX(1)); 771 772 /* read fan divs and 5-bit VID */ 773 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); 774 data->fan_div[0] = (i >> 4) & 3; 775 data->fan_div[1] = (i >> 6) & 3; 776 data->vid = i & 0x0f; 777 data->vid |= (i2c_smbus_read_byte_data(client, 778 ADM9240_REG_VID4) & 1) << 4; 779 /* read analog out */ 780 data->aout = i2c_smbus_read_byte_data(client, 781 ADM9240_REG_ANALOG_OUT); 782 783 data->last_updated_config = jiffies; 784 data->valid = 1; 785 } 786 mutex_unlock(&data->update_lock); 787 return data; 788 } 789 790 static int __init sensors_adm9240_init(void) 791 { 792 return i2c_add_driver(&adm9240_driver); 793 } 794 795 static void __exit sensors_adm9240_exit(void) 796 { 797 i2c_del_driver(&adm9240_driver); 798 } 799 800 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, " 801 "Grant Coady <gcoady.lk@gmail.com> and others"); 802 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver"); 803 MODULE_LICENSE("GPL"); 804 805 module_init(sensors_adm9240_init); 806 module_exit(sensors_adm9240_exit); 807 808