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 #include <linux/regulator/consumer.h> 70 71 /* 72 * Addresses to scan 73 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e. 74 */ 75 76 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 77 78 /* 79 * The LM87 registers 80 */ 81 82 /* nr in 0..5 */ 83 #define LM87_REG_IN(nr) (0x20 + (nr)) 84 #define LM87_REG_IN_MAX(nr) (0x2B + (nr) * 2) 85 #define LM87_REG_IN_MIN(nr) (0x2C + (nr) * 2) 86 /* nr in 0..1 */ 87 #define LM87_REG_AIN(nr) (0x28 + (nr)) 88 #define LM87_REG_AIN_MIN(nr) (0x1A + (nr)) 89 #define LM87_REG_AIN_MAX(nr) (0x3B + (nr)) 90 91 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 }; 92 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B }; 93 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C }; 94 95 #define LM87_REG_TEMP_HW_INT_LOCK 0x13 96 #define LM87_REG_TEMP_HW_EXT_LOCK 0x14 97 #define LM87_REG_TEMP_HW_INT 0x17 98 #define LM87_REG_TEMP_HW_EXT 0x18 99 100 /* nr in 0..1 */ 101 #define LM87_REG_FAN(nr) (0x28 + (nr)) 102 #define LM87_REG_FAN_MIN(nr) (0x3B + (nr)) 103 #define LM87_REG_AOUT 0x19 104 105 #define LM87_REG_CONFIG 0x40 106 #define LM87_REG_CHANNEL_MODE 0x16 107 #define LM87_REG_VID_FAN_DIV 0x47 108 #define LM87_REG_VID4 0x49 109 110 #define LM87_REG_ALARMS1 0x41 111 #define LM87_REG_ALARMS2 0x42 112 113 #define LM87_REG_COMPANY_ID 0x3E 114 #define LM87_REG_REVISION 0x3F 115 116 /* 117 * Conversions and various macros 118 * The LM87 uses signed 8-bit values for temperatures. 119 */ 120 121 #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192) 122 #define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \ 123 (val) >= (scale) * 255 / 192 ? 255 : \ 124 ((val) * 192 + (scale) / 2) / (scale)) 125 126 #define TEMP_FROM_REG(reg) ((reg) * 1000) 127 #define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \ 128 (val) >= 126500 ? 127 : \ 129 (((val) < 0 ? (val) - 500 : \ 130 (val) + 500) / 1000)) 131 132 #define FAN_FROM_REG(reg, div) ((reg) == 255 || (reg) == 0 ? 0 : \ 133 (1350000 + (reg)*(div) / 2) / ((reg) * (div))) 134 #define FAN_TO_REG(val, div) ((val) * (div) * 255 <= 1350000 ? 255 : \ 135 (1350000 + (val)*(div) / 2) / ((val) * (div))) 136 137 #define FAN_DIV_FROM_REG(reg) (1 << (reg)) 138 139 /* analog out is 9.80mV/LSB */ 140 #define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10) 141 #define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \ 142 (val) >= 2500 ? 255 : \ 143 ((val) * 10 + 49) / 98) 144 145 /* nr in 0..1 */ 146 #define CHAN_NO_FAN(nr) (1 << (nr)) 147 #define CHAN_TEMP3 (1 << 2) 148 #define CHAN_VCC_5V (1 << 3) 149 #define CHAN_NO_VID (1 << 7) 150 151 /* 152 * Client data (each client gets its own) 153 */ 154 155 struct lm87_data { 156 struct mutex update_lock; 157 char valid; /* zero until following fields are valid */ 158 unsigned long last_updated; /* In jiffies */ 159 160 u8 channel; /* register value */ 161 u8 config; /* original register value */ 162 163 u8 in[8]; /* register value */ 164 u8 in_max[8]; /* register value */ 165 u8 in_min[8]; /* register value */ 166 u16 in_scale[8]; 167 168 s8 temp[3]; /* register value */ 169 s8 temp_high[3]; /* register value */ 170 s8 temp_low[3]; /* register value */ 171 s8 temp_crit_int; /* min of two register values */ 172 s8 temp_crit_ext; /* min of two register values */ 173 174 u8 fan[2]; /* register value */ 175 u8 fan_min[2]; /* register value */ 176 u8 fan_div[2]; /* register value, shifted right */ 177 u8 aout; /* register value */ 178 179 u16 alarms; /* register values, combined */ 180 u8 vid; /* register values, combined */ 181 u8 vrm; 182 183 const struct attribute_group *attr_groups[6]; 184 }; 185 186 static inline int lm87_read_value(struct i2c_client *client, u8 reg) 187 { 188 return i2c_smbus_read_byte_data(client, reg); 189 } 190 191 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value) 192 { 193 return i2c_smbus_write_byte_data(client, reg, value); 194 } 195 196 static struct lm87_data *lm87_update_device(struct device *dev) 197 { 198 struct i2c_client *client = dev_get_drvdata(dev); 199 struct lm87_data *data = i2c_get_clientdata(client); 200 201 mutex_lock(&data->update_lock); 202 203 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 204 int i, j; 205 206 dev_dbg(&client->dev, "Updating data.\n"); 207 208 i = (data->channel & CHAN_TEMP3) ? 1 : 0; 209 j = (data->channel & CHAN_TEMP3) ? 5 : 6; 210 for (; i < j; i++) { 211 data->in[i] = lm87_read_value(client, 212 LM87_REG_IN(i)); 213 data->in_min[i] = lm87_read_value(client, 214 LM87_REG_IN_MIN(i)); 215 data->in_max[i] = lm87_read_value(client, 216 LM87_REG_IN_MAX(i)); 217 } 218 219 for (i = 0; i < 2; i++) { 220 if (data->channel & CHAN_NO_FAN(i)) { 221 data->in[6+i] = lm87_read_value(client, 222 LM87_REG_AIN(i)); 223 data->in_max[6+i] = lm87_read_value(client, 224 LM87_REG_AIN_MAX(i)); 225 data->in_min[6+i] = lm87_read_value(client, 226 LM87_REG_AIN_MIN(i)); 227 228 } else { 229 data->fan[i] = lm87_read_value(client, 230 LM87_REG_FAN(i)); 231 data->fan_min[i] = lm87_read_value(client, 232 LM87_REG_FAN_MIN(i)); 233 } 234 } 235 236 j = (data->channel & CHAN_TEMP3) ? 3 : 2; 237 for (i = 0 ; i < j; i++) { 238 data->temp[i] = lm87_read_value(client, 239 LM87_REG_TEMP[i]); 240 data->temp_high[i] = lm87_read_value(client, 241 LM87_REG_TEMP_HIGH[i]); 242 data->temp_low[i] = lm87_read_value(client, 243 LM87_REG_TEMP_LOW[i]); 244 } 245 246 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK); 247 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT); 248 data->temp_crit_int = min(i, j); 249 250 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK); 251 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT); 252 data->temp_crit_ext = min(i, j); 253 254 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV); 255 data->fan_div[0] = (i >> 4) & 0x03; 256 data->fan_div[1] = (i >> 6) & 0x03; 257 data->vid = (i & 0x0F) 258 | (lm87_read_value(client, LM87_REG_VID4) & 0x01) 259 << 4; 260 261 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1) 262 | (lm87_read_value(client, LM87_REG_ALARMS2) 263 << 8); 264 data->aout = lm87_read_value(client, LM87_REG_AOUT); 265 266 data->last_updated = jiffies; 267 data->valid = 1; 268 } 269 270 mutex_unlock(&data->update_lock); 271 272 return data; 273 } 274 275 /* 276 * Sysfs stuff 277 */ 278 279 static ssize_t show_in_input(struct device *dev, struct device_attribute *attr, 280 char *buf) 281 { 282 struct lm87_data *data = lm87_update_device(dev); 283 int nr = to_sensor_dev_attr(attr)->index; 284 285 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr], 286 data->in_scale[nr])); 287 } 288 289 static ssize_t show_in_min(struct device *dev, 290 struct device_attribute *attr, char *buf) 291 { 292 struct lm87_data *data = lm87_update_device(dev); 293 int nr = to_sensor_dev_attr(attr)->index; 294 295 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr], 296 data->in_scale[nr])); 297 } 298 299 static ssize_t show_in_max(struct device *dev, 300 struct device_attribute *attr, char *buf) 301 { 302 struct lm87_data *data = lm87_update_device(dev); 303 int nr = to_sensor_dev_attr(attr)->index; 304 305 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr], 306 data->in_scale[nr])); 307 } 308 309 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr, 310 const char *buf, size_t count) 311 { 312 struct i2c_client *client = dev_get_drvdata(dev); 313 struct lm87_data *data = i2c_get_clientdata(client); 314 int nr = to_sensor_dev_attr(attr)->index; 315 long val; 316 int err; 317 318 err = kstrtol(buf, 10, &val); 319 if (err) 320 return err; 321 322 mutex_lock(&data->update_lock); 323 data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]); 324 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) : 325 LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]); 326 mutex_unlock(&data->update_lock); 327 return count; 328 } 329 330 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr, 331 const char *buf, size_t count) 332 { 333 struct i2c_client *client = dev_get_drvdata(dev); 334 struct lm87_data *data = i2c_get_clientdata(client); 335 int nr = to_sensor_dev_attr(attr)->index; 336 long val; 337 int err; 338 339 err = kstrtol(buf, 10, &val); 340 if (err) 341 return err; 342 343 mutex_lock(&data->update_lock); 344 data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]); 345 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) : 346 LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]); 347 mutex_unlock(&data->update_lock); 348 return count; 349 } 350 351 #define set_in(offset) \ 352 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ 353 show_in_input, NULL, offset); \ 354 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ 355 show_in_min, set_in_min, offset); \ 356 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ 357 show_in_max, set_in_max, offset) 358 set_in(0); 359 set_in(1); 360 set_in(2); 361 set_in(3); 362 set_in(4); 363 set_in(5); 364 set_in(6); 365 set_in(7); 366 367 static ssize_t show_temp_input(struct device *dev, 368 struct device_attribute *attr, char *buf) 369 { 370 struct lm87_data *data = lm87_update_device(dev); 371 int nr = to_sensor_dev_attr(attr)->index; 372 373 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr])); 374 } 375 376 static ssize_t show_temp_low(struct device *dev, 377 struct device_attribute *attr, char *buf) 378 { 379 struct lm87_data *data = lm87_update_device(dev); 380 int nr = to_sensor_dev_attr(attr)->index; 381 382 return sprintf(buf, "%d\n", 383 TEMP_FROM_REG(data->temp_low[nr])); 384 } 385 386 static ssize_t show_temp_high(struct device *dev, 387 struct device_attribute *attr, char *buf) 388 { 389 struct lm87_data *data = lm87_update_device(dev); 390 int nr = to_sensor_dev_attr(attr)->index; 391 392 return sprintf(buf, "%d\n", 393 TEMP_FROM_REG(data->temp_high[nr])); 394 } 395 396 static ssize_t set_temp_low(struct device *dev, struct device_attribute *attr, 397 const char *buf, size_t count) 398 { 399 struct i2c_client *client = dev_get_drvdata(dev); 400 struct lm87_data *data = i2c_get_clientdata(client); 401 int nr = to_sensor_dev_attr(attr)->index; 402 long val; 403 int err; 404 405 err = kstrtol(buf, 10, &val); 406 if (err) 407 return err; 408 409 mutex_lock(&data->update_lock); 410 data->temp_low[nr] = TEMP_TO_REG(val); 411 lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]); 412 mutex_unlock(&data->update_lock); 413 return count; 414 } 415 416 static ssize_t set_temp_high(struct device *dev, struct device_attribute *attr, 417 const char *buf, size_t count) 418 { 419 struct i2c_client *client = dev_get_drvdata(dev); 420 struct lm87_data *data = i2c_get_clientdata(client); 421 int nr = to_sensor_dev_attr(attr)->index; 422 long val; 423 int err; 424 425 err = kstrtol(buf, 10, &val); 426 if (err) 427 return err; 428 429 mutex_lock(&data->update_lock); 430 data->temp_high[nr] = TEMP_TO_REG(val); 431 lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]); 432 mutex_unlock(&data->update_lock); 433 return count; 434 } 435 436 #define set_temp(offset) \ 437 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \ 438 show_temp_input, NULL, offset - 1); \ 439 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \ 440 show_temp_high, set_temp_high, offset - 1); \ 441 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \ 442 show_temp_low, set_temp_low, offset - 1) 443 set_temp(1); 444 set_temp(2); 445 set_temp(3); 446 447 static ssize_t temp1_crit_show(struct device *dev, 448 struct device_attribute *attr, char *buf) 449 { 450 struct lm87_data *data = lm87_update_device(dev); 451 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int)); 452 } 453 454 static ssize_t temp2_crit_show(struct device *dev, 455 struct device_attribute *attr, char *buf) 456 { 457 struct lm87_data *data = lm87_update_device(dev); 458 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext)); 459 } 460 461 static DEVICE_ATTR_RO(temp1_crit); 462 static DEVICE_ATTR_RO(temp2_crit); 463 static DEVICE_ATTR(temp3_crit, S_IRUGO, temp2_crit_show, NULL); 464 465 static ssize_t show_fan_input(struct device *dev, 466 struct device_attribute *attr, char *buf) 467 { 468 struct lm87_data *data = lm87_update_device(dev); 469 int nr = to_sensor_dev_attr(attr)->index; 470 471 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], 472 FAN_DIV_FROM_REG(data->fan_div[nr]))); 473 } 474 475 static ssize_t show_fan_min(struct device *dev, 476 struct device_attribute *attr, char *buf) 477 { 478 struct lm87_data *data = lm87_update_device(dev); 479 int nr = to_sensor_dev_attr(attr)->index; 480 481 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr], 482 FAN_DIV_FROM_REG(data->fan_div[nr]))); 483 } 484 485 static ssize_t show_fan_div(struct device *dev, 486 struct device_attribute *attr, char *buf) 487 { 488 struct lm87_data *data = lm87_update_device(dev); 489 int nr = to_sensor_dev_attr(attr)->index; 490 491 return sprintf(buf, "%d\n", 492 FAN_DIV_FROM_REG(data->fan_div[nr])); 493 } 494 495 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr, 496 const char *buf, size_t count) 497 { 498 struct i2c_client *client = dev_get_drvdata(dev); 499 struct lm87_data *data = i2c_get_clientdata(client); 500 int nr = to_sensor_dev_attr(attr)->index; 501 long val; 502 int err; 503 504 err = kstrtol(buf, 10, &val); 505 if (err) 506 return err; 507 508 mutex_lock(&data->update_lock); 509 data->fan_min[nr] = FAN_TO_REG(val, 510 FAN_DIV_FROM_REG(data->fan_div[nr])); 511 lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]); 512 mutex_unlock(&data->update_lock); 513 return count; 514 } 515 516 /* 517 * Note: we save and restore the fan minimum here, because its value is 518 * determined in part by the fan clock divider. This follows the principle 519 * of least surprise; the user doesn't expect the fan minimum to change just 520 * because the divider changed. 521 */ 522 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr, 523 const char *buf, size_t count) 524 { 525 struct i2c_client *client = dev_get_drvdata(dev); 526 struct lm87_data *data = i2c_get_clientdata(client); 527 int nr = to_sensor_dev_attr(attr)->index; 528 long val; 529 int err; 530 unsigned long min; 531 u8 reg; 532 533 err = kstrtol(buf, 10, &val); 534 if (err) 535 return err; 536 537 mutex_lock(&data->update_lock); 538 min = FAN_FROM_REG(data->fan_min[nr], 539 FAN_DIV_FROM_REG(data->fan_div[nr])); 540 541 switch (val) { 542 case 1: 543 data->fan_div[nr] = 0; 544 break; 545 case 2: 546 data->fan_div[nr] = 1; 547 break; 548 case 4: 549 data->fan_div[nr] = 2; 550 break; 551 case 8: 552 data->fan_div[nr] = 3; 553 break; 554 default: 555 mutex_unlock(&data->update_lock); 556 return -EINVAL; 557 } 558 559 reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV); 560 switch (nr) { 561 case 0: 562 reg = (reg & 0xCF) | (data->fan_div[0] << 4); 563 break; 564 case 1: 565 reg = (reg & 0x3F) | (data->fan_div[1] << 6); 566 break; 567 } 568 lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg); 569 570 data->fan_min[nr] = FAN_TO_REG(min, val); 571 lm87_write_value(client, LM87_REG_FAN_MIN(nr), 572 data->fan_min[nr]); 573 mutex_unlock(&data->update_lock); 574 575 return count; 576 } 577 578 #define set_fan(offset) \ 579 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \ 580 show_fan_input, NULL, offset - 1); \ 581 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ 582 show_fan_min, set_fan_min, offset - 1); \ 583 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \ 584 show_fan_div, set_fan_div, offset - 1) 585 set_fan(1); 586 set_fan(2); 587 588 static ssize_t alarms_show(struct device *dev, struct device_attribute *attr, 589 char *buf) 590 { 591 struct lm87_data *data = lm87_update_device(dev); 592 return sprintf(buf, "%d\n", data->alarms); 593 } 594 static DEVICE_ATTR_RO(alarms); 595 596 static ssize_t cpu0_vid_show(struct device *dev, 597 struct device_attribute *attr, char *buf) 598 { 599 struct lm87_data *data = lm87_update_device(dev); 600 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 601 } 602 static DEVICE_ATTR_RO(cpu0_vid); 603 604 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr, 605 char *buf) 606 { 607 struct lm87_data *data = dev_get_drvdata(dev); 608 return sprintf(buf, "%d\n", data->vrm); 609 } 610 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr, 611 const char *buf, size_t count) 612 { 613 struct lm87_data *data = dev_get_drvdata(dev); 614 unsigned long val; 615 int err; 616 617 err = kstrtoul(buf, 10, &val); 618 if (err) 619 return err; 620 621 if (val > 255) 622 return -EINVAL; 623 624 data->vrm = val; 625 return count; 626 } 627 static DEVICE_ATTR_RW(vrm); 628 629 static ssize_t aout_output_show(struct device *dev, 630 struct device_attribute *attr, char *buf) 631 { 632 struct lm87_data *data = lm87_update_device(dev); 633 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 634 } 635 static ssize_t aout_output_store(struct device *dev, 636 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_RW(aout_output); 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 struct device_node *of_node = client->dev.of_node; 858 u8 val = 0; 859 struct regulator *vcc = NULL; 860 861 if (of_node) { 862 if (of_property_read_bool(of_node, "has-temp3")) 863 val |= CHAN_TEMP3; 864 if (of_property_read_bool(of_node, "has-in6")) 865 val |= CHAN_NO_FAN(0); 866 if (of_property_read_bool(of_node, "has-in7")) 867 val |= CHAN_NO_FAN(1); 868 vcc = devm_regulator_get_optional(&client->dev, "vcc"); 869 if (!IS_ERR(vcc)) { 870 if (regulator_get_voltage(vcc) == 5000000) 871 val |= CHAN_VCC_5V; 872 } 873 data->channel = val; 874 lm87_write_value(client, 875 LM87_REG_CHANNEL_MODE, data->channel); 876 } else if (dev_get_platdata(&client->dev)) { 877 data->channel = *(u8 *)dev_get_platdata(&client->dev); 878 lm87_write_value(client, 879 LM87_REG_CHANNEL_MODE, data->channel); 880 } else { 881 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE); 882 } 883 data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F; 884 885 rc = devm_add_action(&client->dev, lm87_restore_config, client); 886 if (rc) 887 return rc; 888 889 if (!(data->config & 0x01)) { 890 int i; 891 892 /* Limits are left uninitialized after power-up */ 893 for (i = 1; i < 6; i++) { 894 lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00); 895 lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF); 896 } 897 for (i = 0; i < 2; i++) { 898 lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F); 899 lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00); 900 lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00); 901 lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF); 902 } 903 if (data->channel & CHAN_TEMP3) { 904 lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F); 905 lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00); 906 } else { 907 lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00); 908 lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF); 909 } 910 } 911 912 /* Make sure Start is set and INT#_Clear is clear */ 913 if ((data->config & 0x09) != 0x01) 914 lm87_write_value(client, LM87_REG_CONFIG, 915 (data->config & 0x77) | 0x01); 916 return 0; 917 } 918 919 static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id) 920 { 921 struct lm87_data *data; 922 struct device *hwmon_dev; 923 int err; 924 unsigned int group_tail = 0; 925 926 data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL); 927 if (!data) 928 return -ENOMEM; 929 930 i2c_set_clientdata(client, data); 931 mutex_init(&data->update_lock); 932 933 /* Initialize the LM87 chip */ 934 err = lm87_init_client(client); 935 if (err) 936 return err; 937 938 data->in_scale[0] = 2500; 939 data->in_scale[1] = 2700; 940 data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300; 941 data->in_scale[3] = 5000; 942 data->in_scale[4] = 12000; 943 data->in_scale[5] = 2700; 944 data->in_scale[6] = 1875; 945 data->in_scale[7] = 1875; 946 947 /* 948 * Construct the list of attributes, the list depends on the 949 * configuration of the chip 950 */ 951 data->attr_groups[group_tail++] = &lm87_group; 952 if (data->channel & CHAN_NO_FAN(0)) 953 data->attr_groups[group_tail++] = &lm87_group_in6; 954 else 955 data->attr_groups[group_tail++] = &lm87_group_fan1; 956 957 if (data->channel & CHAN_NO_FAN(1)) 958 data->attr_groups[group_tail++] = &lm87_group_in7; 959 else 960 data->attr_groups[group_tail++] = &lm87_group_fan2; 961 962 if (data->channel & CHAN_TEMP3) 963 data->attr_groups[group_tail++] = &lm87_group_temp3; 964 else 965 data->attr_groups[group_tail++] = &lm87_group_in0_5; 966 967 if (!(data->channel & CHAN_NO_VID)) { 968 data->vrm = vid_which_vrm(); 969 data->attr_groups[group_tail++] = &lm87_group_vid; 970 } 971 972 hwmon_dev = devm_hwmon_device_register_with_groups( 973 &client->dev, client->name, client, data->attr_groups); 974 return PTR_ERR_OR_ZERO(hwmon_dev); 975 } 976 977 /* 978 * Driver data (common to all clients) 979 */ 980 981 static const struct i2c_device_id lm87_id[] = { 982 { "lm87", 0 }, 983 { "adm1024", 0 }, 984 { } 985 }; 986 MODULE_DEVICE_TABLE(i2c, lm87_id); 987 988 static const struct of_device_id lm87_of_match[] = { 989 { .compatible = "ti,lm87" }, 990 { .compatible = "adi,adm1024" }, 991 { }, 992 }; 993 MODULE_DEVICE_TABLE(of, lm87_of_match); 994 995 static struct i2c_driver lm87_driver = { 996 .class = I2C_CLASS_HWMON, 997 .driver = { 998 .name = "lm87", 999 .of_match_table = lm87_of_match, 1000 }, 1001 .probe = lm87_probe, 1002 .id_table = lm87_id, 1003 .detect = lm87_detect, 1004 .address_list = normal_i2c, 1005 }; 1006 1007 module_i2c_driver(lm87_driver); 1008 1009 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others"); 1010 MODULE_DESCRIPTION("LM87 driver"); 1011 MODULE_LICENSE("GPL"); 1012