1 /* 2 * lm87.c 3 * 4 * Copyright (C) 2000 Frodo Looijaard <frodol@dds.nl> 5 * Philip Edelbrock <phil@netroedge.com> 6 * Stephen Rousset <stephen.rousset@rocketlogix.com> 7 * Dan Eaton <dan.eaton@rocketlogix.com> 8 * Copyright (C) 2004-2008 Jean Delvare <jdelvare@suse.de> 9 * 10 * Original port to Linux 2.6 by Jeff Oliver. 11 * 12 * The LM87 is a sensor chip made by National Semiconductor. It monitors up 13 * to 8 voltages (including its own power source), up to three temperatures 14 * (its own plus up to two external ones) and up to two fans. The default 15 * configuration is 6 voltages, two temperatures and two fans (see below). 16 * Voltages are scaled internally with ratios such that the nominal value of 17 * each voltage correspond to a register value of 192 (which means a 18 * resolution of about 0.5% of the nominal value). Temperature values are 19 * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete 20 * datasheet can be obtained from National's website at: 21 * http://www.national.com/pf/LM/LM87.html 22 * 23 * Some functions share pins, so not all functions are available at the same 24 * time. Which are depends on the hardware setup. This driver normally 25 * assumes that firmware configured the chip correctly. Where this is not 26 * the case, platform code must set the I2C client's platform_data to point 27 * to a u8 value to be written to the channel register. 28 * For reference, here is the list of exclusive functions: 29 * - in0+in5 (default) or temp3 30 * - fan1 (default) or in6 31 * - fan2 (default) or in7 32 * - VID lines (default) or IRQ lines (not handled by this driver) 33 * 34 * The LM87 additionally features an analog output, supposedly usable to 35 * control the speed of a fan. All new chips use pulse width modulation 36 * instead. The LM87 is the only hardware monitoring chipset I know of 37 * which uses amplitude modulation. Be careful when using this feature. 38 * 39 * This driver also supports the ADM1024, a sensor chip made by Analog 40 * Devices. That chip is fully compatible with the LM87. Complete 41 * datasheet can be obtained from Analog's website at: 42 * http://www.analog.com/en/prod/0,2877,ADM1024,00.html 43 * 44 * This program is free software; you can redistribute it and/or modify 45 * it under the terms of the GNU General Public License as published by 46 * the Free Software Foundation; either version 2 of the License, or 47 * (at your option) any later version. 48 * 49 * This program is distributed in the hope that it will be useful, 50 * but WITHOUT ANY WARRANTY; without even the implied warranty of 51 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 52 * GNU General Public License for more details. 53 * 54 * You should have received a copy of the GNU General Public License 55 * along with this program; if not, write to the Free Software 56 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 57 */ 58 59 #include <linux/module.h> 60 #include <linux/init.h> 61 #include <linux/slab.h> 62 #include <linux/jiffies.h> 63 #include <linux/i2c.h> 64 #include <linux/hwmon.h> 65 #include <linux/hwmon-sysfs.h> 66 #include <linux/hwmon-vid.h> 67 #include <linux/err.h> 68 #include <linux/mutex.h> 69 70 /* 71 * Addresses to scan 72 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e. 73 */ 74 75 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 76 77 enum chips { lm87, adm1024 }; 78 79 /* 80 * The LM87 registers 81 */ 82 83 /* nr in 0..5 */ 84 #define LM87_REG_IN(nr) (0x20 + (nr)) 85 #define LM87_REG_IN_MAX(nr) (0x2B + (nr) * 2) 86 #define LM87_REG_IN_MIN(nr) (0x2C + (nr) * 2) 87 /* nr in 0..1 */ 88 #define LM87_REG_AIN(nr) (0x28 + (nr)) 89 #define LM87_REG_AIN_MIN(nr) (0x1A + (nr)) 90 #define LM87_REG_AIN_MAX(nr) (0x3B + (nr)) 91 92 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 }; 93 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B }; 94 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C }; 95 96 #define LM87_REG_TEMP_HW_INT_LOCK 0x13 97 #define LM87_REG_TEMP_HW_EXT_LOCK 0x14 98 #define LM87_REG_TEMP_HW_INT 0x17 99 #define LM87_REG_TEMP_HW_EXT 0x18 100 101 /* nr in 0..1 */ 102 #define LM87_REG_FAN(nr) (0x28 + (nr)) 103 #define LM87_REG_FAN_MIN(nr) (0x3B + (nr)) 104 #define LM87_REG_AOUT 0x19 105 106 #define LM87_REG_CONFIG 0x40 107 #define LM87_REG_CHANNEL_MODE 0x16 108 #define LM87_REG_VID_FAN_DIV 0x47 109 #define LM87_REG_VID4 0x49 110 111 #define LM87_REG_ALARMS1 0x41 112 #define LM87_REG_ALARMS2 0x42 113 114 #define LM87_REG_COMPANY_ID 0x3E 115 #define LM87_REG_REVISION 0x3F 116 117 /* 118 * Conversions and various macros 119 * The LM87 uses signed 8-bit values for temperatures. 120 */ 121 122 #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192) 123 #define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \ 124 (val) * 192 >= (scale) * 255 ? 255 : \ 125 ((val) * 192 + (scale) / 2) / (scale)) 126 127 #define TEMP_FROM_REG(reg) ((reg) * 1000) 128 #define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \ 129 (val) >= 126500 ? 127 : \ 130 (((val) < 0 ? (val) - 500 : \ 131 (val) + 500) / 1000)) 132 133 #define FAN_FROM_REG(reg, div) ((reg) == 255 || (reg) == 0 ? 0 : \ 134 (1350000 + (reg)*(div) / 2) / ((reg) * (div))) 135 #define FAN_TO_REG(val, div) ((val) * (div) * 255 <= 1350000 ? 255 : \ 136 (1350000 + (val)*(div) / 2) / ((val) * (div))) 137 138 #define FAN_DIV_FROM_REG(reg) (1 << (reg)) 139 140 /* analog out is 9.80mV/LSB */ 141 #define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10) 142 #define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \ 143 (val) >= 2500 ? 255 : \ 144 ((val) * 10 + 49) / 98) 145 146 /* nr in 0..1 */ 147 #define CHAN_NO_FAN(nr) (1 << (nr)) 148 #define CHAN_TEMP3 (1 << 2) 149 #define CHAN_VCC_5V (1 << 3) 150 #define CHAN_NO_VID (1 << 7) 151 152 /* 153 * Client data (each client gets its own) 154 */ 155 156 struct lm87_data { 157 struct mutex update_lock; 158 char valid; /* zero until following fields are valid */ 159 unsigned long last_updated; /* In jiffies */ 160 161 u8 channel; /* register value */ 162 u8 config; /* original register value */ 163 164 u8 in[8]; /* register value */ 165 u8 in_max[8]; /* register value */ 166 u8 in_min[8]; /* register value */ 167 u16 in_scale[8]; 168 169 s8 temp[3]; /* register value */ 170 s8 temp_high[3]; /* register value */ 171 s8 temp_low[3]; /* register value */ 172 s8 temp_crit_int; /* min of two register values */ 173 s8 temp_crit_ext; /* min of two register values */ 174 175 u8 fan[2]; /* register value */ 176 u8 fan_min[2]; /* register value */ 177 u8 fan_div[2]; /* register value, shifted right */ 178 u8 aout; /* register value */ 179 180 u16 alarms; /* register values, combined */ 181 u8 vid; /* register values, combined */ 182 u8 vrm; 183 184 const struct attribute_group *attr_groups[6]; 185 }; 186 187 static inline int lm87_read_value(struct i2c_client *client, u8 reg) 188 { 189 return i2c_smbus_read_byte_data(client, reg); 190 } 191 192 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value) 193 { 194 return i2c_smbus_write_byte_data(client, reg, value); 195 } 196 197 static struct lm87_data *lm87_update_device(struct device *dev) 198 { 199 struct i2c_client *client = dev_get_drvdata(dev); 200 struct lm87_data *data = i2c_get_clientdata(client); 201 202 mutex_lock(&data->update_lock); 203 204 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 205 int i, j; 206 207 dev_dbg(&client->dev, "Updating data.\n"); 208 209 i = (data->channel & CHAN_TEMP3) ? 1 : 0; 210 j = (data->channel & CHAN_TEMP3) ? 5 : 6; 211 for (; i < j; i++) { 212 data->in[i] = lm87_read_value(client, 213 LM87_REG_IN(i)); 214 data->in_min[i] = lm87_read_value(client, 215 LM87_REG_IN_MIN(i)); 216 data->in_max[i] = lm87_read_value(client, 217 LM87_REG_IN_MAX(i)); 218 } 219 220 for (i = 0; i < 2; i++) { 221 if (data->channel & CHAN_NO_FAN(i)) { 222 data->in[6+i] = lm87_read_value(client, 223 LM87_REG_AIN(i)); 224 data->in_max[6+i] = lm87_read_value(client, 225 LM87_REG_AIN_MAX(i)); 226 data->in_min[6+i] = lm87_read_value(client, 227 LM87_REG_AIN_MIN(i)); 228 229 } else { 230 data->fan[i] = lm87_read_value(client, 231 LM87_REG_FAN(i)); 232 data->fan_min[i] = lm87_read_value(client, 233 LM87_REG_FAN_MIN(i)); 234 } 235 } 236 237 j = (data->channel & CHAN_TEMP3) ? 3 : 2; 238 for (i = 0 ; i < j; i++) { 239 data->temp[i] = lm87_read_value(client, 240 LM87_REG_TEMP[i]); 241 data->temp_high[i] = lm87_read_value(client, 242 LM87_REG_TEMP_HIGH[i]); 243 data->temp_low[i] = lm87_read_value(client, 244 LM87_REG_TEMP_LOW[i]); 245 } 246 247 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK); 248 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT); 249 data->temp_crit_int = min(i, j); 250 251 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK); 252 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT); 253 data->temp_crit_ext = min(i, j); 254 255 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV); 256 data->fan_div[0] = (i >> 4) & 0x03; 257 data->fan_div[1] = (i >> 6) & 0x03; 258 data->vid = (i & 0x0F) 259 | (lm87_read_value(client, LM87_REG_VID4) & 0x01) 260 << 4; 261 262 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1) 263 | (lm87_read_value(client, LM87_REG_ALARMS2) 264 << 8); 265 data->aout = lm87_read_value(client, LM87_REG_AOUT); 266 267 data->last_updated = jiffies; 268 data->valid = 1; 269 } 270 271 mutex_unlock(&data->update_lock); 272 273 return data; 274 } 275 276 /* 277 * Sysfs stuff 278 */ 279 280 static ssize_t show_in_input(struct device *dev, struct device_attribute *attr, 281 char *buf) 282 { 283 struct lm87_data *data = lm87_update_device(dev); 284 int nr = to_sensor_dev_attr(attr)->index; 285 286 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr], 287 data->in_scale[nr])); 288 } 289 290 static ssize_t show_in_min(struct device *dev, 291 struct device_attribute *attr, char *buf) 292 { 293 struct lm87_data *data = lm87_update_device(dev); 294 int nr = to_sensor_dev_attr(attr)->index; 295 296 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr], 297 data->in_scale[nr])); 298 } 299 300 static ssize_t show_in_max(struct device *dev, 301 struct device_attribute *attr, char *buf) 302 { 303 struct lm87_data *data = lm87_update_device(dev); 304 int nr = to_sensor_dev_attr(attr)->index; 305 306 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr], 307 data->in_scale[nr])); 308 } 309 310 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr, 311 const char *buf, size_t count) 312 { 313 struct i2c_client *client = dev_get_drvdata(dev); 314 struct lm87_data *data = i2c_get_clientdata(client); 315 int nr = to_sensor_dev_attr(attr)->index; 316 long val; 317 int err; 318 319 err = kstrtol(buf, 10, &val); 320 if (err) 321 return err; 322 323 mutex_lock(&data->update_lock); 324 data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]); 325 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) : 326 LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]); 327 mutex_unlock(&data->update_lock); 328 return count; 329 } 330 331 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr, 332 const char *buf, size_t count) 333 { 334 struct i2c_client *client = dev_get_drvdata(dev); 335 struct lm87_data *data = i2c_get_clientdata(client); 336 int nr = to_sensor_dev_attr(attr)->index; 337 long val; 338 int err; 339 340 err = kstrtol(buf, 10, &val); 341 if (err) 342 return err; 343 344 mutex_lock(&data->update_lock); 345 data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]); 346 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) : 347 LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]); 348 mutex_unlock(&data->update_lock); 349 return count; 350 } 351 352 #define set_in(offset) \ 353 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ 354 show_in_input, NULL, offset); \ 355 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ 356 show_in_min, set_in_min, offset); \ 357 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ 358 show_in_max, set_in_max, offset) 359 set_in(0); 360 set_in(1); 361 set_in(2); 362 set_in(3); 363 set_in(4); 364 set_in(5); 365 set_in(6); 366 set_in(7); 367 368 static ssize_t show_temp_input(struct device *dev, 369 struct device_attribute *attr, char *buf) 370 { 371 struct lm87_data *data = lm87_update_device(dev); 372 int nr = to_sensor_dev_attr(attr)->index; 373 374 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr])); 375 } 376 377 static ssize_t show_temp_low(struct device *dev, 378 struct device_attribute *attr, char *buf) 379 { 380 struct lm87_data *data = lm87_update_device(dev); 381 int nr = to_sensor_dev_attr(attr)->index; 382 383 return sprintf(buf, "%d\n", 384 TEMP_FROM_REG(data->temp_low[nr])); 385 } 386 387 static ssize_t show_temp_high(struct device *dev, 388 struct device_attribute *attr, char *buf) 389 { 390 struct lm87_data *data = lm87_update_device(dev); 391 int nr = to_sensor_dev_attr(attr)->index; 392 393 return sprintf(buf, "%d\n", 394 TEMP_FROM_REG(data->temp_high[nr])); 395 } 396 397 static ssize_t set_temp_low(struct device *dev, struct device_attribute *attr, 398 const char *buf, size_t count) 399 { 400 struct i2c_client *client = dev_get_drvdata(dev); 401 struct lm87_data *data = i2c_get_clientdata(client); 402 int nr = to_sensor_dev_attr(attr)->index; 403 long val; 404 int err; 405 406 err = kstrtol(buf, 10, &val); 407 if (err) 408 return err; 409 410 mutex_lock(&data->update_lock); 411 data->temp_low[nr] = TEMP_TO_REG(val); 412 lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]); 413 mutex_unlock(&data->update_lock); 414 return count; 415 } 416 417 static ssize_t set_temp_high(struct device *dev, struct device_attribute *attr, 418 const char *buf, size_t count) 419 { 420 struct i2c_client *client = dev_get_drvdata(dev); 421 struct lm87_data *data = i2c_get_clientdata(client); 422 int nr = to_sensor_dev_attr(attr)->index; 423 long val; 424 int err; 425 426 err = kstrtol(buf, 10, &val); 427 if (err) 428 return err; 429 430 mutex_lock(&data->update_lock); 431 data->temp_high[nr] = TEMP_TO_REG(val); 432 lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]); 433 mutex_unlock(&data->update_lock); 434 return count; 435 } 436 437 #define set_temp(offset) \ 438 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \ 439 show_temp_input, NULL, offset - 1); \ 440 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \ 441 show_temp_high, set_temp_high, offset - 1); \ 442 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \ 443 show_temp_low, set_temp_low, offset - 1) 444 set_temp(1); 445 set_temp(2); 446 set_temp(3); 447 448 static ssize_t show_temp_crit_int(struct device *dev, 449 struct device_attribute *attr, char *buf) 450 { 451 struct lm87_data *data = lm87_update_device(dev); 452 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int)); 453 } 454 455 static ssize_t show_temp_crit_ext(struct device *dev, 456 struct device_attribute *attr, char *buf) 457 { 458 struct lm87_data *data = lm87_update_device(dev); 459 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext)); 460 } 461 462 static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL); 463 static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL); 464 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL); 465 466 static ssize_t show_fan_input(struct device *dev, 467 struct device_attribute *attr, char *buf) 468 { 469 struct lm87_data *data = lm87_update_device(dev); 470 int nr = to_sensor_dev_attr(attr)->index; 471 472 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], 473 FAN_DIV_FROM_REG(data->fan_div[nr]))); 474 } 475 476 static ssize_t show_fan_min(struct device *dev, 477 struct device_attribute *attr, char *buf) 478 { 479 struct lm87_data *data = lm87_update_device(dev); 480 int nr = to_sensor_dev_attr(attr)->index; 481 482 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr], 483 FAN_DIV_FROM_REG(data->fan_div[nr]))); 484 } 485 486 static ssize_t show_fan_div(struct device *dev, 487 struct device_attribute *attr, char *buf) 488 { 489 struct lm87_data *data = lm87_update_device(dev); 490 int nr = to_sensor_dev_attr(attr)->index; 491 492 return sprintf(buf, "%d\n", 493 FAN_DIV_FROM_REG(data->fan_div[nr])); 494 } 495 496 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr, 497 const char *buf, size_t count) 498 { 499 struct i2c_client *client = dev_get_drvdata(dev); 500 struct lm87_data *data = i2c_get_clientdata(client); 501 int nr = to_sensor_dev_attr(attr)->index; 502 long val; 503 int err; 504 505 err = kstrtol(buf, 10, &val); 506 if (err) 507 return err; 508 509 mutex_lock(&data->update_lock); 510 data->fan_min[nr] = FAN_TO_REG(val, 511 FAN_DIV_FROM_REG(data->fan_div[nr])); 512 lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]); 513 mutex_unlock(&data->update_lock); 514 return count; 515 } 516 517 /* 518 * Note: we save and restore the fan minimum here, because its value is 519 * determined in part by the fan clock divider. This follows the principle 520 * of least surprise; the user doesn't expect the fan minimum to change just 521 * because the divider changed. 522 */ 523 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr, 524 const char *buf, size_t count) 525 { 526 struct i2c_client *client = dev_get_drvdata(dev); 527 struct lm87_data *data = i2c_get_clientdata(client); 528 int nr = to_sensor_dev_attr(attr)->index; 529 long val; 530 int err; 531 unsigned long min; 532 u8 reg; 533 534 err = kstrtol(buf, 10, &val); 535 if (err) 536 return err; 537 538 mutex_lock(&data->update_lock); 539 min = FAN_FROM_REG(data->fan_min[nr], 540 FAN_DIV_FROM_REG(data->fan_div[nr])); 541 542 switch (val) { 543 case 1: 544 data->fan_div[nr] = 0; 545 break; 546 case 2: 547 data->fan_div[nr] = 1; 548 break; 549 case 4: 550 data->fan_div[nr] = 2; 551 break; 552 case 8: 553 data->fan_div[nr] = 3; 554 break; 555 default: 556 mutex_unlock(&data->update_lock); 557 return -EINVAL; 558 } 559 560 reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV); 561 switch (nr) { 562 case 0: 563 reg = (reg & 0xCF) | (data->fan_div[0] << 4); 564 break; 565 case 1: 566 reg = (reg & 0x3F) | (data->fan_div[1] << 6); 567 break; 568 } 569 lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg); 570 571 data->fan_min[nr] = FAN_TO_REG(min, val); 572 lm87_write_value(client, LM87_REG_FAN_MIN(nr), 573 data->fan_min[nr]); 574 mutex_unlock(&data->update_lock); 575 576 return count; 577 } 578 579 #define set_fan(offset) \ 580 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \ 581 show_fan_input, NULL, offset - 1); \ 582 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ 583 show_fan_min, set_fan_min, offset - 1); \ 584 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \ 585 show_fan_div, set_fan_div, offset - 1) 586 set_fan(1); 587 set_fan(2); 588 589 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, 590 char *buf) 591 { 592 struct lm87_data *data = lm87_update_device(dev); 593 return sprintf(buf, "%d\n", data->alarms); 594 } 595 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 596 597 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, 598 char *buf) 599 { 600 struct lm87_data *data = lm87_update_device(dev); 601 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 602 } 603 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 604 605 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, 606 char *buf) 607 { 608 struct lm87_data *data = dev_get_drvdata(dev); 609 return sprintf(buf, "%d\n", data->vrm); 610 } 611 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, 612 const char *buf, size_t count) 613 { 614 struct lm87_data *data = dev_get_drvdata(dev); 615 unsigned long val; 616 int err; 617 618 err = kstrtoul(buf, 10, &val); 619 if (err) 620 return err; 621 622 if (val > 255) 623 return -EINVAL; 624 625 data->vrm = val; 626 return count; 627 } 628 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm); 629 630 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, 631 char *buf) 632 { 633 struct lm87_data *data = lm87_update_device(dev); 634 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 635 } 636 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, 637 const char *buf, size_t count) 638 { 639 struct i2c_client *client = dev_get_drvdata(dev); 640 struct lm87_data *data = i2c_get_clientdata(client); 641 long val; 642 int err; 643 644 err = kstrtol(buf, 10, &val); 645 if (err) 646 return err; 647 648 mutex_lock(&data->update_lock); 649 data->aout = AOUT_TO_REG(val); 650 lm87_write_value(client, LM87_REG_AOUT, data->aout); 651 mutex_unlock(&data->update_lock); 652 return count; 653 } 654 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout); 655 656 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, 657 char *buf) 658 { 659 struct lm87_data *data = lm87_update_device(dev); 660 int bitnr = to_sensor_dev_attr(attr)->index; 661 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 662 } 663 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 664 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 665 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); 666 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); 667 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); 668 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9); 669 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6); 670 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7); 671 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); 672 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5); 673 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5); 674 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6); 675 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); 676 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14); 677 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15); 678 679 /* 680 * Real code 681 */ 682 683 static struct attribute *lm87_attributes[] = { 684 &sensor_dev_attr_in1_input.dev_attr.attr, 685 &sensor_dev_attr_in1_min.dev_attr.attr, 686 &sensor_dev_attr_in1_max.dev_attr.attr, 687 &sensor_dev_attr_in1_alarm.dev_attr.attr, 688 &sensor_dev_attr_in2_input.dev_attr.attr, 689 &sensor_dev_attr_in2_min.dev_attr.attr, 690 &sensor_dev_attr_in2_max.dev_attr.attr, 691 &sensor_dev_attr_in2_alarm.dev_attr.attr, 692 &sensor_dev_attr_in3_input.dev_attr.attr, 693 &sensor_dev_attr_in3_min.dev_attr.attr, 694 &sensor_dev_attr_in3_max.dev_attr.attr, 695 &sensor_dev_attr_in3_alarm.dev_attr.attr, 696 &sensor_dev_attr_in4_input.dev_attr.attr, 697 &sensor_dev_attr_in4_min.dev_attr.attr, 698 &sensor_dev_attr_in4_max.dev_attr.attr, 699 &sensor_dev_attr_in4_alarm.dev_attr.attr, 700 701 &sensor_dev_attr_temp1_input.dev_attr.attr, 702 &sensor_dev_attr_temp1_max.dev_attr.attr, 703 &sensor_dev_attr_temp1_min.dev_attr.attr, 704 &dev_attr_temp1_crit.attr, 705 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 706 &sensor_dev_attr_temp2_input.dev_attr.attr, 707 &sensor_dev_attr_temp2_max.dev_attr.attr, 708 &sensor_dev_attr_temp2_min.dev_attr.attr, 709 &dev_attr_temp2_crit.attr, 710 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 711 &sensor_dev_attr_temp2_fault.dev_attr.attr, 712 713 &dev_attr_alarms.attr, 714 &dev_attr_aout_output.attr, 715 716 NULL 717 }; 718 719 static const struct attribute_group lm87_group = { 720 .attrs = lm87_attributes, 721 }; 722 723 static struct attribute *lm87_attributes_in6[] = { 724 &sensor_dev_attr_in6_input.dev_attr.attr, 725 &sensor_dev_attr_in6_min.dev_attr.attr, 726 &sensor_dev_attr_in6_max.dev_attr.attr, 727 &sensor_dev_attr_in6_alarm.dev_attr.attr, 728 NULL 729 }; 730 731 static const struct attribute_group lm87_group_in6 = { 732 .attrs = lm87_attributes_in6, 733 }; 734 735 static struct attribute *lm87_attributes_fan1[] = { 736 &sensor_dev_attr_fan1_input.dev_attr.attr, 737 &sensor_dev_attr_fan1_min.dev_attr.attr, 738 &sensor_dev_attr_fan1_div.dev_attr.attr, 739 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 740 NULL 741 }; 742 743 static const struct attribute_group lm87_group_fan1 = { 744 .attrs = lm87_attributes_fan1, 745 }; 746 747 static struct attribute *lm87_attributes_in7[] = { 748 &sensor_dev_attr_in7_input.dev_attr.attr, 749 &sensor_dev_attr_in7_min.dev_attr.attr, 750 &sensor_dev_attr_in7_max.dev_attr.attr, 751 &sensor_dev_attr_in7_alarm.dev_attr.attr, 752 NULL 753 }; 754 755 static const struct attribute_group lm87_group_in7 = { 756 .attrs = lm87_attributes_in7, 757 }; 758 759 static struct attribute *lm87_attributes_fan2[] = { 760 &sensor_dev_attr_fan2_input.dev_attr.attr, 761 &sensor_dev_attr_fan2_min.dev_attr.attr, 762 &sensor_dev_attr_fan2_div.dev_attr.attr, 763 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 764 NULL 765 }; 766 767 static const struct attribute_group lm87_group_fan2 = { 768 .attrs = lm87_attributes_fan2, 769 }; 770 771 static struct attribute *lm87_attributes_temp3[] = { 772 &sensor_dev_attr_temp3_input.dev_attr.attr, 773 &sensor_dev_attr_temp3_max.dev_attr.attr, 774 &sensor_dev_attr_temp3_min.dev_attr.attr, 775 &dev_attr_temp3_crit.attr, 776 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 777 &sensor_dev_attr_temp3_fault.dev_attr.attr, 778 NULL 779 }; 780 781 static const struct attribute_group lm87_group_temp3 = { 782 .attrs = lm87_attributes_temp3, 783 }; 784 785 static struct attribute *lm87_attributes_in0_5[] = { 786 &sensor_dev_attr_in0_input.dev_attr.attr, 787 &sensor_dev_attr_in0_min.dev_attr.attr, 788 &sensor_dev_attr_in0_max.dev_attr.attr, 789 &sensor_dev_attr_in0_alarm.dev_attr.attr, 790 &sensor_dev_attr_in5_input.dev_attr.attr, 791 &sensor_dev_attr_in5_min.dev_attr.attr, 792 &sensor_dev_attr_in5_max.dev_attr.attr, 793 &sensor_dev_attr_in5_alarm.dev_attr.attr, 794 NULL 795 }; 796 797 static const struct attribute_group lm87_group_in0_5 = { 798 .attrs = lm87_attributes_in0_5, 799 }; 800 801 static struct attribute *lm87_attributes_vid[] = { 802 &dev_attr_cpu0_vid.attr, 803 &dev_attr_vrm.attr, 804 NULL 805 }; 806 807 static const struct attribute_group lm87_group_vid = { 808 .attrs = lm87_attributes_vid, 809 }; 810 811 /* Return 0 if detection is successful, -ENODEV otherwise */ 812 static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info) 813 { 814 struct i2c_adapter *adapter = client->adapter; 815 const char *name; 816 u8 cid, rev; 817 818 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 819 return -ENODEV; 820 821 if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80) 822 return -ENODEV; 823 824 /* Now, we do the remaining detection. */ 825 cid = lm87_read_value(client, LM87_REG_COMPANY_ID); 826 rev = lm87_read_value(client, LM87_REG_REVISION); 827 828 if (cid == 0x02 /* National Semiconductor */ 829 && (rev >= 0x01 && rev <= 0x08)) 830 name = "lm87"; 831 else if (cid == 0x41 /* Analog Devices */ 832 && (rev & 0xf0) == 0x10) 833 name = "adm1024"; 834 else { 835 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n", 836 client->addr); 837 return -ENODEV; 838 } 839 840 strlcpy(info->type, name, I2C_NAME_SIZE); 841 842 return 0; 843 } 844 845 static void lm87_restore_config(void *arg) 846 { 847 struct i2c_client *client = arg; 848 struct lm87_data *data = i2c_get_clientdata(client); 849 850 lm87_write_value(client, LM87_REG_CONFIG, data->config); 851 } 852 853 static int lm87_init_client(struct i2c_client *client) 854 { 855 struct lm87_data *data = i2c_get_clientdata(client); 856 int rc; 857 858 if (dev_get_platdata(&client->dev)) { 859 data->channel = *(u8 *)dev_get_platdata(&client->dev); 860 lm87_write_value(client, 861 LM87_REG_CHANNEL_MODE, data->channel); 862 } else { 863 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE); 864 } 865 data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F; 866 867 rc = devm_add_action(&client->dev, lm87_restore_config, client); 868 if (rc) 869 return rc; 870 871 if (!(data->config & 0x01)) { 872 int i; 873 874 /* Limits are left uninitialized after power-up */ 875 for (i = 1; i < 6; i++) { 876 lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00); 877 lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF); 878 } 879 for (i = 0; i < 2; i++) { 880 lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F); 881 lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00); 882 lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00); 883 lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF); 884 } 885 if (data->channel & CHAN_TEMP3) { 886 lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F); 887 lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00); 888 } else { 889 lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00); 890 lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF); 891 } 892 } 893 894 /* Make sure Start is set and INT#_Clear is clear */ 895 if ((data->config & 0x09) != 0x01) 896 lm87_write_value(client, LM87_REG_CONFIG, 897 (data->config & 0x77) | 0x01); 898 return 0; 899 } 900 901 static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id) 902 { 903 struct lm87_data *data; 904 struct device *hwmon_dev; 905 int err; 906 unsigned int group_tail = 0; 907 908 data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL); 909 if (!data) 910 return -ENOMEM; 911 912 i2c_set_clientdata(client, data); 913 mutex_init(&data->update_lock); 914 915 /* Initialize the LM87 chip */ 916 err = lm87_init_client(client); 917 if (err) 918 return err; 919 920 data->in_scale[0] = 2500; 921 data->in_scale[1] = 2700; 922 data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300; 923 data->in_scale[3] = 5000; 924 data->in_scale[4] = 12000; 925 data->in_scale[5] = 2700; 926 data->in_scale[6] = 1875; 927 data->in_scale[7] = 1875; 928 929 /* 930 * Construct the list of attributes, the list depends on the 931 * configuration of the chip 932 */ 933 data->attr_groups[group_tail++] = &lm87_group; 934 if (data->channel & CHAN_NO_FAN(0)) 935 data->attr_groups[group_tail++] = &lm87_group_in6; 936 else 937 data->attr_groups[group_tail++] = &lm87_group_fan1; 938 939 if (data->channel & CHAN_NO_FAN(1)) 940 data->attr_groups[group_tail++] = &lm87_group_in7; 941 else 942 data->attr_groups[group_tail++] = &lm87_group_fan2; 943 944 if (data->channel & CHAN_TEMP3) 945 data->attr_groups[group_tail++] = &lm87_group_temp3; 946 else 947 data->attr_groups[group_tail++] = &lm87_group_in0_5; 948 949 if (!(data->channel & CHAN_NO_VID)) { 950 data->vrm = vid_which_vrm(); 951 data->attr_groups[group_tail++] = &lm87_group_vid; 952 } 953 954 hwmon_dev = devm_hwmon_device_register_with_groups( 955 &client->dev, client->name, client, data->attr_groups); 956 return PTR_ERR_OR_ZERO(hwmon_dev); 957 } 958 959 /* 960 * Driver data (common to all clients) 961 */ 962 963 static const struct i2c_device_id lm87_id[] = { 964 { "lm87", lm87 }, 965 { "adm1024", adm1024 }, 966 { } 967 }; 968 MODULE_DEVICE_TABLE(i2c, lm87_id); 969 970 static struct i2c_driver lm87_driver = { 971 .class = I2C_CLASS_HWMON, 972 .driver = { 973 .name = "lm87", 974 }, 975 .probe = lm87_probe, 976 .id_table = lm87_id, 977 .detect = lm87_detect, 978 .address_list = normal_i2c, 979 }; 980 981 module_i2c_driver(lm87_driver); 982 983 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others"); 984 MODULE_DESCRIPTION("LM87 driver"); 985 MODULE_LICENSE("GPL"); 986