1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * lm80.c - From lm_sensors, Linux kernel modules for hardware 4 * monitoring 5 * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> 6 * and Philip Edelbrock <phil@netroedge.com> 7 * 8 * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/slab.h> 14 #include <linux/jiffies.h> 15 #include <linux/i2c.h> 16 #include <linux/hwmon.h> 17 #include <linux/hwmon-sysfs.h> 18 #include <linux/err.h> 19 #include <linux/mutex.h> 20 21 /* Addresses to scan */ 22 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 23 0x2e, 0x2f, I2C_CLIENT_END }; 24 25 /* Many LM80 constants specified below */ 26 27 /* The LM80 registers */ 28 #define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2) 29 #define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2) 30 #define LM80_REG_IN(nr) (0x20 + (nr)) 31 32 #define LM80_REG_FAN1 0x28 33 #define LM80_REG_FAN2 0x29 34 #define LM80_REG_FAN_MIN(nr) (0x3b + (nr)) 35 36 #define LM80_REG_TEMP 0x27 37 #define LM80_REG_TEMP_HOT_MAX 0x38 38 #define LM80_REG_TEMP_HOT_HYST 0x39 39 #define LM80_REG_TEMP_OS_MAX 0x3a 40 #define LM80_REG_TEMP_OS_HYST 0x3b 41 42 #define LM80_REG_CONFIG 0x00 43 #define LM80_REG_ALARM1 0x01 44 #define LM80_REG_ALARM2 0x02 45 #define LM80_REG_MASK1 0x03 46 #define LM80_REG_MASK2 0x04 47 #define LM80_REG_FANDIV 0x05 48 #define LM80_REG_RES 0x06 49 50 #define LM96080_REG_CONV_RATE 0x07 51 #define LM96080_REG_MAN_ID 0x3e 52 #define LM96080_REG_DEV_ID 0x3f 53 54 55 /* 56 * Conversions. Rounding and limit checking is only done on the TO_REG 57 * variants. Note that you should be a bit careful with which arguments 58 * these macros are called: arguments may be evaluated more than once. 59 * Fixing this is just not worth it. 60 */ 61 62 #define IN_TO_REG(val) (clamp_val(((val) + 5) / 10, 0, 255)) 63 #define IN_FROM_REG(val) ((val) * 10) 64 65 static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div) 66 { 67 if (rpm == 0) 68 return 255; 69 rpm = clamp_val(rpm, 1, 1000000); 70 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254); 71 } 72 73 #define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \ 74 (val) == 255 ? 0 : 1350000/((div) * (val))) 75 76 #define TEMP_FROM_REG(reg) ((reg) * 125 / 32) 77 #define TEMP_TO_REG(temp) (DIV_ROUND_CLOSEST(clamp_val((temp), \ 78 -128000, 127000), 1000) << 8) 79 80 #define DIV_FROM_REG(val) (1 << (val)) 81 82 enum temp_index { 83 t_input = 0, 84 t_hot_max, 85 t_hot_hyst, 86 t_os_max, 87 t_os_hyst, 88 t_num_temp 89 }; 90 91 static const u8 temp_regs[t_num_temp] = { 92 [t_input] = LM80_REG_TEMP, 93 [t_hot_max] = LM80_REG_TEMP_HOT_MAX, 94 [t_hot_hyst] = LM80_REG_TEMP_HOT_HYST, 95 [t_os_max] = LM80_REG_TEMP_OS_MAX, 96 [t_os_hyst] = LM80_REG_TEMP_OS_HYST, 97 }; 98 99 enum in_index { 100 i_input = 0, 101 i_max, 102 i_min, 103 i_num_in 104 }; 105 106 enum fan_index { 107 f_input, 108 f_min, 109 f_num_fan 110 }; 111 112 /* 113 * Client data (each client gets its own) 114 */ 115 116 struct lm80_data { 117 struct i2c_client *client; 118 struct mutex update_lock; 119 char error; /* !=0 if error occurred during last update */ 120 char valid; /* !=0 if following fields are valid */ 121 unsigned long last_updated; /* In jiffies */ 122 123 u8 in[i_num_in][7]; /* Register value, 1st index is enum in_index */ 124 u8 fan[f_num_fan][2]; /* Register value, 1st index enum fan_index */ 125 u8 fan_div[2]; /* Register encoding, shifted right */ 126 s16 temp[t_num_temp]; /* Register values, normalized to 16 bit */ 127 u16 alarms; /* Register encoding, combined */ 128 }; 129 130 static int lm80_read_value(struct i2c_client *client, u8 reg) 131 { 132 return i2c_smbus_read_byte_data(client, reg); 133 } 134 135 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value) 136 { 137 return i2c_smbus_write_byte_data(client, reg, value); 138 } 139 140 /* Called when we have found a new LM80 and after read errors */ 141 static void lm80_init_client(struct i2c_client *client) 142 { 143 /* 144 * Reset all except Watchdog values and last conversion values 145 * This sets fan-divs to 2, among others. This makes most other 146 * initializations unnecessary 147 */ 148 lm80_write_value(client, LM80_REG_CONFIG, 0x80); 149 /* Set 11-bit temperature resolution */ 150 lm80_write_value(client, LM80_REG_RES, 0x08); 151 152 /* Start monitoring */ 153 lm80_write_value(client, LM80_REG_CONFIG, 0x01); 154 } 155 156 static struct lm80_data *lm80_update_device(struct device *dev) 157 { 158 struct lm80_data *data = dev_get_drvdata(dev); 159 struct i2c_client *client = data->client; 160 int i; 161 int rv; 162 int prev_rv; 163 struct lm80_data *ret = data; 164 165 mutex_lock(&data->update_lock); 166 167 if (data->error) 168 lm80_init_client(client); 169 170 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { 171 dev_dbg(dev, "Starting lm80 update\n"); 172 for (i = 0; i <= 6; i++) { 173 rv = lm80_read_value(client, LM80_REG_IN(i)); 174 if (rv < 0) 175 goto abort; 176 data->in[i_input][i] = rv; 177 178 rv = lm80_read_value(client, LM80_REG_IN_MIN(i)); 179 if (rv < 0) 180 goto abort; 181 data->in[i_min][i] = rv; 182 183 rv = lm80_read_value(client, LM80_REG_IN_MAX(i)); 184 if (rv < 0) 185 goto abort; 186 data->in[i_max][i] = rv; 187 } 188 189 rv = lm80_read_value(client, LM80_REG_FAN1); 190 if (rv < 0) 191 goto abort; 192 data->fan[f_input][0] = rv; 193 194 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1)); 195 if (rv < 0) 196 goto abort; 197 data->fan[f_min][0] = rv; 198 199 rv = lm80_read_value(client, LM80_REG_FAN2); 200 if (rv < 0) 201 goto abort; 202 data->fan[f_input][1] = rv; 203 204 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2)); 205 if (rv < 0) 206 goto abort; 207 data->fan[f_min][1] = rv; 208 209 prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP); 210 if (rv < 0) 211 goto abort; 212 rv = lm80_read_value(client, LM80_REG_RES); 213 if (rv < 0) 214 goto abort; 215 data->temp[t_input] = (prev_rv << 8) | (rv & 0xf0); 216 217 for (i = t_input + 1; i < t_num_temp; i++) { 218 rv = lm80_read_value(client, temp_regs[i]); 219 if (rv < 0) 220 goto abort; 221 data->temp[i] = rv << 8; 222 } 223 224 rv = lm80_read_value(client, LM80_REG_FANDIV); 225 if (rv < 0) 226 goto abort; 227 data->fan_div[0] = (rv >> 2) & 0x03; 228 data->fan_div[1] = (rv >> 4) & 0x03; 229 230 prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1); 231 if (rv < 0) 232 goto abort; 233 rv = lm80_read_value(client, LM80_REG_ALARM2); 234 if (rv < 0) 235 goto abort; 236 data->alarms = prev_rv + (rv << 8); 237 238 data->last_updated = jiffies; 239 data->valid = 1; 240 data->error = 0; 241 } 242 goto done; 243 244 abort: 245 ret = ERR_PTR(rv); 246 data->valid = 0; 247 data->error = 1; 248 249 done: 250 mutex_unlock(&data->update_lock); 251 252 return ret; 253 } 254 255 /* 256 * Sysfs stuff 257 */ 258 259 static ssize_t in_show(struct device *dev, struct device_attribute *attr, 260 char *buf) 261 { 262 struct lm80_data *data = lm80_update_device(dev); 263 int index = to_sensor_dev_attr_2(attr)->index; 264 int nr = to_sensor_dev_attr_2(attr)->nr; 265 266 if (IS_ERR(data)) 267 return PTR_ERR(data); 268 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr][index])); 269 } 270 271 static ssize_t in_store(struct device *dev, struct device_attribute *attr, 272 const char *buf, size_t count) 273 { 274 struct lm80_data *data = dev_get_drvdata(dev); 275 struct i2c_client *client = data->client; 276 int index = to_sensor_dev_attr_2(attr)->index; 277 int nr = to_sensor_dev_attr_2(attr)->nr; 278 long val; 279 u8 reg; 280 int err = kstrtol(buf, 10, &val); 281 if (err < 0) 282 return err; 283 284 reg = nr == i_min ? LM80_REG_IN_MIN(index) : LM80_REG_IN_MAX(index); 285 286 mutex_lock(&data->update_lock); 287 data->in[nr][index] = IN_TO_REG(val); 288 lm80_write_value(client, reg, data->in[nr][index]); 289 mutex_unlock(&data->update_lock); 290 return count; 291 } 292 293 static ssize_t fan_show(struct device *dev, struct device_attribute *attr, 294 char *buf) 295 { 296 int index = to_sensor_dev_attr_2(attr)->index; 297 int nr = to_sensor_dev_attr_2(attr)->nr; 298 struct lm80_data *data = lm80_update_device(dev); 299 if (IS_ERR(data)) 300 return PTR_ERR(data); 301 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr][index], 302 DIV_FROM_REG(data->fan_div[index]))); 303 } 304 305 static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr, 306 char *buf) 307 { 308 int nr = to_sensor_dev_attr(attr)->index; 309 struct lm80_data *data = lm80_update_device(dev); 310 if (IS_ERR(data)) 311 return PTR_ERR(data); 312 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr])); 313 } 314 315 static ssize_t fan_store(struct device *dev, struct device_attribute *attr, 316 const char *buf, size_t count) 317 { 318 int index = to_sensor_dev_attr_2(attr)->index; 319 int nr = to_sensor_dev_attr_2(attr)->nr; 320 struct lm80_data *data = dev_get_drvdata(dev); 321 struct i2c_client *client = data->client; 322 unsigned long val; 323 int err = kstrtoul(buf, 10, &val); 324 if (err < 0) 325 return err; 326 327 mutex_lock(&data->update_lock); 328 data->fan[nr][index] = FAN_TO_REG(val, 329 DIV_FROM_REG(data->fan_div[index])); 330 lm80_write_value(client, LM80_REG_FAN_MIN(index + 1), 331 data->fan[nr][index]); 332 mutex_unlock(&data->update_lock); 333 return count; 334 } 335 336 /* 337 * Note: we save and restore the fan minimum here, because its value is 338 * determined in part by the fan divisor. This follows the principle of 339 * least surprise; the user doesn't expect the fan minimum to change just 340 * because the divisor changed. 341 */ 342 static ssize_t fan_div_store(struct device *dev, 343 struct device_attribute *attr, const char *buf, 344 size_t count) 345 { 346 int nr = to_sensor_dev_attr(attr)->index; 347 struct lm80_data *data = dev_get_drvdata(dev); 348 struct i2c_client *client = data->client; 349 unsigned long min, val; 350 u8 reg; 351 int rv; 352 353 rv = kstrtoul(buf, 10, &val); 354 if (rv < 0) 355 return rv; 356 357 /* Save fan_min */ 358 mutex_lock(&data->update_lock); 359 min = FAN_FROM_REG(data->fan[f_min][nr], 360 DIV_FROM_REG(data->fan_div[nr])); 361 362 switch (val) { 363 case 1: 364 data->fan_div[nr] = 0; 365 break; 366 case 2: 367 data->fan_div[nr] = 1; 368 break; 369 case 4: 370 data->fan_div[nr] = 2; 371 break; 372 case 8: 373 data->fan_div[nr] = 3; 374 break; 375 default: 376 dev_err(dev, 377 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", 378 val); 379 mutex_unlock(&data->update_lock); 380 return -EINVAL; 381 } 382 383 rv = lm80_read_value(client, LM80_REG_FANDIV); 384 if (rv < 0) { 385 mutex_unlock(&data->update_lock); 386 return rv; 387 } 388 reg = (rv & ~(3 << (2 * (nr + 1)))) 389 | (data->fan_div[nr] << (2 * (nr + 1))); 390 lm80_write_value(client, LM80_REG_FANDIV, reg); 391 392 /* Restore fan_min */ 393 data->fan[f_min][nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); 394 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), 395 data->fan[f_min][nr]); 396 mutex_unlock(&data->update_lock); 397 398 return count; 399 } 400 401 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, 402 char *buf) 403 { 404 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 405 struct lm80_data *data = lm80_update_device(dev); 406 if (IS_ERR(data)) 407 return PTR_ERR(data); 408 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])); 409 } 410 411 static ssize_t temp_store(struct device *dev, 412 struct device_attribute *devattr, const char *buf, 413 size_t count) 414 { 415 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 416 struct lm80_data *data = dev_get_drvdata(dev); 417 struct i2c_client *client = data->client; 418 int nr = attr->index; 419 long val; 420 int err = kstrtol(buf, 10, &val); 421 if (err < 0) 422 return err; 423 424 mutex_lock(&data->update_lock); 425 data->temp[nr] = TEMP_TO_REG(val); 426 lm80_write_value(client, temp_regs[nr], data->temp[nr] >> 8); 427 mutex_unlock(&data->update_lock); 428 return count; 429 } 430 431 static ssize_t alarms_show(struct device *dev, struct device_attribute *attr, 432 char *buf) 433 { 434 struct lm80_data *data = lm80_update_device(dev); 435 if (IS_ERR(data)) 436 return PTR_ERR(data); 437 return sprintf(buf, "%u\n", data->alarms); 438 } 439 440 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, 441 char *buf) 442 { 443 int bitnr = to_sensor_dev_attr(attr)->index; 444 struct lm80_data *data = lm80_update_device(dev); 445 if (IS_ERR(data)) 446 return PTR_ERR(data); 447 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 448 } 449 450 static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, i_min, 0); 451 static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, i_min, 1); 452 static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, i_min, 2); 453 static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, i_min, 3); 454 static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, i_min, 4); 455 static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, i_min, 5); 456 static SENSOR_DEVICE_ATTR_2_RW(in6_min, in, i_min, 6); 457 static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, i_max, 0); 458 static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, i_max, 1); 459 static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, i_max, 2); 460 static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, i_max, 3); 461 static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, i_max, 4); 462 static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, i_max, 5); 463 static SENSOR_DEVICE_ATTR_2_RW(in6_max, in, i_max, 6); 464 static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, i_input, 0); 465 static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, i_input, 1); 466 static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, i_input, 2); 467 static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, i_input, 3); 468 static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, i_input, 4); 469 static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, i_input, 5); 470 static SENSOR_DEVICE_ATTR_2_RO(in6_input, in, i_input, 6); 471 static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, f_min, 0); 472 static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, f_min, 1); 473 static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, f_input, 0); 474 static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, f_input, 1); 475 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); 476 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); 477 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input); 478 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, t_hot_max); 479 static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, t_hot_hyst); 480 static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, t_os_max); 481 static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp, t_os_hyst); 482 static DEVICE_ATTR_RO(alarms); 483 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0); 484 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1); 485 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2); 486 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3); 487 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 4); 488 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 5); 489 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6); 490 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 10); 491 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 11); 492 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 8); 493 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 13); 494 495 /* 496 * Real code 497 */ 498 499 static struct attribute *lm80_attrs[] = { 500 &sensor_dev_attr_in0_min.dev_attr.attr, 501 &sensor_dev_attr_in1_min.dev_attr.attr, 502 &sensor_dev_attr_in2_min.dev_attr.attr, 503 &sensor_dev_attr_in3_min.dev_attr.attr, 504 &sensor_dev_attr_in4_min.dev_attr.attr, 505 &sensor_dev_attr_in5_min.dev_attr.attr, 506 &sensor_dev_attr_in6_min.dev_attr.attr, 507 &sensor_dev_attr_in0_max.dev_attr.attr, 508 &sensor_dev_attr_in1_max.dev_attr.attr, 509 &sensor_dev_attr_in2_max.dev_attr.attr, 510 &sensor_dev_attr_in3_max.dev_attr.attr, 511 &sensor_dev_attr_in4_max.dev_attr.attr, 512 &sensor_dev_attr_in5_max.dev_attr.attr, 513 &sensor_dev_attr_in6_max.dev_attr.attr, 514 &sensor_dev_attr_in0_input.dev_attr.attr, 515 &sensor_dev_attr_in1_input.dev_attr.attr, 516 &sensor_dev_attr_in2_input.dev_attr.attr, 517 &sensor_dev_attr_in3_input.dev_attr.attr, 518 &sensor_dev_attr_in4_input.dev_attr.attr, 519 &sensor_dev_attr_in5_input.dev_attr.attr, 520 &sensor_dev_attr_in6_input.dev_attr.attr, 521 &sensor_dev_attr_fan1_min.dev_attr.attr, 522 &sensor_dev_attr_fan2_min.dev_attr.attr, 523 &sensor_dev_attr_fan1_input.dev_attr.attr, 524 &sensor_dev_attr_fan2_input.dev_attr.attr, 525 &sensor_dev_attr_fan1_div.dev_attr.attr, 526 &sensor_dev_attr_fan2_div.dev_attr.attr, 527 &sensor_dev_attr_temp1_input.dev_attr.attr, 528 &sensor_dev_attr_temp1_max.dev_attr.attr, 529 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 530 &sensor_dev_attr_temp1_crit.dev_attr.attr, 531 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, 532 &dev_attr_alarms.attr, 533 &sensor_dev_attr_in0_alarm.dev_attr.attr, 534 &sensor_dev_attr_in1_alarm.dev_attr.attr, 535 &sensor_dev_attr_in2_alarm.dev_attr.attr, 536 &sensor_dev_attr_in3_alarm.dev_attr.attr, 537 &sensor_dev_attr_in4_alarm.dev_attr.attr, 538 &sensor_dev_attr_in5_alarm.dev_attr.attr, 539 &sensor_dev_attr_in6_alarm.dev_attr.attr, 540 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 541 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 542 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 543 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 544 NULL 545 }; 546 ATTRIBUTE_GROUPS(lm80); 547 548 /* Return 0 if detection is successful, -ENODEV otherwise */ 549 static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info) 550 { 551 struct i2c_adapter *adapter = client->adapter; 552 int i, cur, man_id, dev_id; 553 const char *name = NULL; 554 555 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 556 return -ENODEV; 557 558 /* First check for unused bits, common to both chip types */ 559 if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0) 560 || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80)) 561 return -ENODEV; 562 563 /* 564 * The LM96080 has manufacturer and stepping/die rev registers so we 565 * can just check that. The LM80 does not have such registers so we 566 * have to use a more expensive trick. 567 */ 568 man_id = lm80_read_value(client, LM96080_REG_MAN_ID); 569 dev_id = lm80_read_value(client, LM96080_REG_DEV_ID); 570 if (man_id == 0x01 && dev_id == 0x08) { 571 /* Check more unused bits for confirmation */ 572 if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe) 573 return -ENODEV; 574 575 name = "lm96080"; 576 } else { 577 /* Check 6-bit addressing */ 578 for (i = 0x2a; i <= 0x3d; i++) { 579 cur = i2c_smbus_read_byte_data(client, i); 580 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur) 581 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur) 582 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur)) 583 return -ENODEV; 584 } 585 586 name = "lm80"; 587 } 588 589 strlcpy(info->type, name, I2C_NAME_SIZE); 590 591 return 0; 592 } 593 594 static int lm80_probe(struct i2c_client *client, 595 const struct i2c_device_id *id) 596 { 597 struct device *dev = &client->dev; 598 struct device *hwmon_dev; 599 struct lm80_data *data; 600 int rv; 601 602 data = devm_kzalloc(dev, sizeof(struct lm80_data), GFP_KERNEL); 603 if (!data) 604 return -ENOMEM; 605 606 data->client = client; 607 mutex_init(&data->update_lock); 608 609 /* Initialize the LM80 chip */ 610 lm80_init_client(client); 611 612 /* A few vars need to be filled upon startup */ 613 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1)); 614 if (rv < 0) 615 return rv; 616 data->fan[f_min][0] = rv; 617 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2)); 618 if (rv < 0) 619 return rv; 620 data->fan[f_min][1] = rv; 621 622 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 623 data, lm80_groups); 624 625 return PTR_ERR_OR_ZERO(hwmon_dev); 626 } 627 628 /* 629 * Driver data (common to all clients) 630 */ 631 632 static const struct i2c_device_id lm80_id[] = { 633 { "lm80", 0 }, 634 { "lm96080", 1 }, 635 { } 636 }; 637 MODULE_DEVICE_TABLE(i2c, lm80_id); 638 639 static struct i2c_driver lm80_driver = { 640 .class = I2C_CLASS_HWMON, 641 .driver = { 642 .name = "lm80", 643 }, 644 .probe = lm80_probe, 645 .id_table = lm80_id, 646 .detect = lm80_detect, 647 .address_list = normal_i2c, 648 }; 649 650 module_i2c_driver(lm80_driver); 651 652 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " 653 "Philip Edelbrock <phil@netroedge.com>"); 654 MODULE_DESCRIPTION("LM80 driver"); 655 MODULE_LICENSE("GPL"); 656