FILE
lm87.c
File preview with syntax highlighting.
linux-6.19.14/drivers/hwmon/lm87.c
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * lm87.c 4 * 5 * Copyright (C) 2000 Frodo Looijaard <frodol@dds.nl> 6 * Philip Edelbrock <phil@netroedge.com> 7 * Stephen Rousset <stephen.rousset@rocketlogix.com> 8 * Dan Eaton <dan.eaton@rocketlogix.com> 9 * Copyright (C) 2004-2008 Jean Delvare <jdelvare@suse.de> 10 * 11 * Original port to Linux 2.6 by Jeff Oliver. 12 * 13 * The LM87 is a sensor chip made by National Semiconductor. It monitors up 14 * to 8 voltages (including its own power source), up to three temperatures 15 * (its own plus up to two external ones) and up to two fans. The default 16 * configuration is 6 voltages, two temperatures and two fans (see below). 17 * Voltages are scaled internally with ratios such that the nominal value of 18 * each voltage correspond to a register value of 192 (which means a 19 * resolution of about 0.5% of the nominal value). Temperature values are 20 * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete 21 * datasheet can be obtained from National's website at: 22 * http://www.national.com/pf/LM/LM87.html 23 * 24 * Some functions share pins, so not all functions are available at the same 25 * time. Which are depends on the hardware setup. This driver normally 26 * assumes that firmware configured the chip correctly. Where this is not 27 * the case, platform code must set the I2C client's platform_data to point 28 * to a u8 value to be written to the channel register. 29 * For reference, here is the list of exclusive functions: 30 * - in0+in5 (default) or temp3 31 * - fan1 (default) or in6 32 * - fan2 (default) or in7 33 * - VID lines (default) or IRQ lines (not handled by this driver) 34 * 35 * The LM87 additionally features an analog output, supposedly usable to 36 * control the speed of a fan. All new chips use pulse width modulation 37 * instead. The LM87 is the only hardware monitoring chipset I know of 38 * which uses amplitude modulation. Be careful when using this feature. 39 * 40 * This driver also supports the ADM1024, a sensor chip made by Analog 41 * Devices. That chip is fully compatible with the LM87. Complete 42 * datasheet can be obtained from Analog's website at: 43 * https://www.analog.com/en/prod/0,2877,ADM1024,00.html 44 */ 45 46#include <linux/module.h> 47#include <linux/init.h> 48#include <linux/slab.h> 49#include <linux/jiffies.h> 50#include <linux/i2c.h> 51#include <linux/hwmon.h> 52#include <linux/hwmon-sysfs.h> 53#include <linux/hwmon-vid.h> 54#include <linux/err.h> 55#include <linux/mutex.h> 56#include <linux/regulator/consumer.h> 57 58/* 59 * Addresses to scan 60 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e. 61 */ 62 63static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 64 65/* 66 * The LM87 registers 67 */ 68 69/* nr in 0..5 */ 70#define LM87_REG_IN(nr) (0x20 + (nr)) 71#define LM87_REG_IN_MAX(nr) (0x2B + (nr) * 2) 72#define LM87_REG_IN_MIN(nr) (0x2C + (nr) * 2) 73/* nr in 0..1 */ 74#define LM87_REG_AIN(nr) (0x28 + (nr)) 75#define LM87_REG_AIN_MIN(nr) (0x1A + (nr)) 76#define LM87_REG_AIN_MAX(nr) (0x3B + (nr)) 77 78static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 }; 79static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B }; 80static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C }; 81 82#define LM87_REG_TEMP_HW_INT_LOCK 0x13 83#define LM87_REG_TEMP_HW_EXT_LOCK 0x14 84#define LM87_REG_TEMP_HW_INT 0x17 85#define LM87_REG_TEMP_HW_EXT 0x18 86 87/* nr in 0..1 */ 88#define LM87_REG_FAN(nr) (0x28 + (nr)) 89#define LM87_REG_FAN_MIN(nr) (0x3B + (nr)) 90#define LM87_REG_AOUT 0x19 91 92#define LM87_REG_CONFIG 0x40 93#define LM87_REG_CHANNEL_MODE 0x16 94#define LM87_REG_VID_FAN_DIV 0x47 95#define LM87_REG_VID4 0x49 96 97#define LM87_REG_ALARMS1 0x41 98#define LM87_REG_ALARMS2 0x42 99 100#define LM87_REG_COMPANY_ID 0x3E 101#define LM87_REG_REVISION 0x3F 102 103/* 104 * Conversions and various macros 105 * The LM87 uses signed 8-bit values for temperatures. 106 */ 107 108#define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192) 109#define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \ 110 (val) >= (scale) * 255 / 192 ? 255 : \ 111 ((val) * 192 + (scale) / 2) / (scale)) 112 113#define TEMP_FROM_REG(reg) ((reg) * 1000) 114#define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \ 115 (val) >= 126500 ? 127 : \ 116 (((val) < 0 ? (val) - 500 : \ 117 (val) + 500) / 1000)) 118 119static int fan_from_reg(int reg, int div) 120{ 121 if (reg == 255 || reg == 0) 122 return 0; 123 124 return (1350000 + reg * div / 2) / (reg * div); 125} 126 127#define FAN_TO_REG(val, div) ((val) * (div) * 255 <= 1350000 ? 255 : \ 128 (1350000 + (val)*(div) / 2) / ((val) * (div))) 129 130#define FAN_DIV_FROM_REG(reg) (1 << (reg)) 131 132/* analog out is 9.80mV/LSB */ 133#define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10) 134#define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \ 135 (val) >= 2500 ? 255 : \ 136 ((val) * 10 + 49) / 98) 137 138/* nr in 0..1 */ 139#define CHAN_NO_FAN(nr) (1 << (nr)) 140#define CHAN_TEMP3 (1 << 2) 141#define CHAN_VCC_5V (1 << 3) 142#define CHAN_NO_VID (1 << 7) 143 144/* 145 * Client data (each client gets its own) 146 */ 147 148struct lm87_data { 149 struct mutex update_lock; 150 bool valid; /* false until following fields are valid */ 151 unsigned long last_updated; /* In jiffies */ 152 153 u8 channel; /* register value */ 154 u8 config; /* original register value */ 155 156 u8 in[8]; /* register value */ 157 u8 in_max[8]; /* register value */ 158 u8 in_min[8]; /* register value */ 159 u16 in_scale[8]; 160 161 s8 temp[3]; /* register value */ 162 s8 temp_high[3]; /* register value */ 163 s8 temp_low[3]; /* register value */ 164 s8 temp_crit_int; /* min of two register values */ 165 s8 temp_crit_ext; /* min of two register values */ 166 167 u8 fan[2]; /* register value */ 168 u8 fan_min[2]; /* register value */ 169 u8 fan_div[2]; /* register value, shifted right */ 170 u8 aout; /* register value */ 171 172 u16 alarms; /* register values, combined */ 173 u8 vid; /* register values, combined */ 174 u8 vrm; 175 176 const struct attribute_group *attr_groups[6]; 177}; 178 179static inline int lm87_read_value(struct i2c_client *client, u8 reg) 180{ 181 return i2c_smbus_read_byte_data(client, reg); 182} 183 184static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value) 185{ 186 return i2c_smbus_write_byte_data(client, reg, value); 187} 188 189static struct lm87_data *lm87_update_device(struct device *dev) 190{ 191 struct i2c_client *client = dev_get_drvdata(dev); 192 struct lm87_data *data = i2c_get_clientdata(client); 193 194 mutex_lock(&data->update_lock); 195 196 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 197 int i, j; 198 199 dev_dbg(&client->dev, "Updating data.\n"); 200 201 i = (data->channel & CHAN_TEMP3) ? 1 : 0; 202 j = (data->channel & CHAN_TEMP3) ? 5 : 6; 203 for (; i < j; i++) { 204 data->in[i] = lm87_read_value(client, 205 LM87_REG_IN(i)); 206 data->in_min[i] = lm87_read_value(client, 207 LM87_REG_IN_MIN(i)); 208 data->in_max[i] = lm87_read_value(client, 209 LM87_REG_IN_MAX(i)); 210 } 211 212 for (i = 0; i < 2; i++) { 213 if (data->channel & CHAN_NO_FAN(i)) { 214 data->in[6+i] = lm87_read_value(client, 215 LM87_REG_AIN(i)); 216 data->in_max[6+i] = lm87_read_value(client, 217 LM87_REG_AIN_MAX(i)); 218 data->in_min[6+i] = lm87_read_value(client, 219 LM87_REG_AIN_MIN(i)); 220 221 } else { 222 data->fan[i] = lm87_read_value(client, 223 LM87_REG_FAN(i)); 224 data->fan_min[i] = lm87_read_value(client, 225 LM87_REG_FAN_MIN(i)); 226 } 227 } 228 229 j = (data->channel & CHAN_TEMP3) ? 3 : 2; 230 for (i = 0 ; i < j; i++) { 231 data->temp[i] = lm87_read_value(client, 232 LM87_REG_TEMP[i]); 233 data->temp_high[i] = lm87_read_value(client, 234 LM87_REG_TEMP_HIGH[i]); 235 data->temp_low[i] = lm87_read_value(client, 236 LM87_REG_TEMP_LOW[i]); 237 } 238 239 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK); 240 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT); 241 data->temp_crit_int = min(i, j); 242 243 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK); 244 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT); 245 data->temp_crit_ext = min(i, j); 246 247 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV); 248 data->fan_div[0] = (i >> 4) & 0x03; 249 data->fan_div[1] = (i >> 6) & 0x03; 250 data->vid = (i & 0x0F) 251 | (lm87_read_value(client, LM87_REG_VID4) & 0x01) 252 << 4; 253 254 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1) 255 | (lm87_read_value(client, LM87_REG_ALARMS2) 256 << 8); 257 data->aout = lm87_read_value(client, LM87_REG_AOUT); 258 259 data->last_updated = jiffies; 260 data->valid = true; 261 } 262 263 mutex_unlock(&data->update_lock); 264 265 return data; 266} 267 268/* 269 * Sysfs stuff 270 */ 271 272static ssize_t in_input_show(struct device *dev, 273 struct device_attribute *attr, char *buf) 274{ 275 struct lm87_data *data = lm87_update_device(dev); 276 int nr = to_sensor_dev_attr(attr)->index; 277 278 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr], 279 data->in_scale[nr])); 280} 281 282static ssize_t in_min_show(struct device *dev, struct device_attribute *attr, 283 char *buf) 284{ 285 struct lm87_data *data = lm87_update_device(dev); 286 int nr = to_sensor_dev_attr(attr)->index; 287 288 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr], 289 data->in_scale[nr])); 290} 291 292static ssize_t in_max_show(struct device *dev, struct device_attribute *attr, 293 char *buf) 294{ 295 struct lm87_data *data = lm87_update_device(dev); 296 int nr = to_sensor_dev_attr(attr)->index; 297 298 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr], 299 data->in_scale[nr])); 300} 301 302static ssize_t in_min_store(struct device *dev, struct device_attribute *attr, 303 const char *buf, size_t count) 304{ 305 struct i2c_client *client = dev_get_drvdata(dev); 306 struct lm87_data *data = i2c_get_clientdata(client); 307 int nr = to_sensor_dev_attr(attr)->index; 308 long val; 309 int err; 310 311 err = kstrtol(buf, 10, &val); 312 if (err) 313 return err; 314 315 mutex_lock(&data->update_lock); 316 data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]); 317 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) : 318 LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]); 319 mutex_unlock(&data->update_lock); 320 return count; 321} 322 323static ssize_t in_max_store(struct device *dev, struct device_attribute *attr, 324 const char *buf, size_t count) 325{ 326 struct i2c_client *client = dev_get_drvdata(dev); 327 struct lm87_data *data = i2c_get_clientdata(client); 328 int nr = to_sensor_dev_attr(attr)->index; 329 long val; 330 int err; 331 332 err = kstrtol(buf, 10, &val); 333 if (err) 334 return err; 335 336 mutex_lock(&data->update_lock); 337 data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]); 338 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) : 339 LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]); 340 mutex_unlock(&data->update_lock); 341 return count; 342} 343 344static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0); 345static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0); 346static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0); 347static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1); 348static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1); 349static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1); 350static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2); 351static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2); 352static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2); 353static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3); 354static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3); 355static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3); 356static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4); 357static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4); 358static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4); 359static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5); 360static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5); 361static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5); 362static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6); 363static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6); 364static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6); 365static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7); 366static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7); 367static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7); 368 369static ssize_t temp_input_show(struct device *dev, 370 struct device_attribute *attr, char *buf) 371{ 372 struct lm87_data *data = lm87_update_device(dev); 373 int nr = to_sensor_dev_attr(attr)->index; 374 375 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr])); 376} 377 378static ssize_t temp_low_show(struct device *dev, 379 struct device_attribute *attr, char *buf) 380{ 381 struct lm87_data *data = lm87_update_device(dev); 382 int nr = to_sensor_dev_attr(attr)->index; 383 384 return sprintf(buf, "%d\n", 385 TEMP_FROM_REG(data->temp_low[nr])); 386} 387 388static ssize_t temp_high_show(struct device *dev, 389 struct device_attribute *attr, char *buf) 390{ 391 struct lm87_data *data = lm87_update_device(dev); 392 int nr = to_sensor_dev_attr(attr)->index; 393 394 return sprintf(buf, "%d\n", 395 TEMP_FROM_REG(data->temp_high[nr])); 396} 397 398static ssize_t temp_low_store(struct device *dev, 399 struct device_attribute *attr, const char *buf, 400 size_t count) 401{ 402 struct i2c_client *client = dev_get_drvdata(dev); 403 struct lm87_data *data = i2c_get_clientdata(client); 404 int nr = to_sensor_dev_attr(attr)->index; 405 long val; 406 int err; 407 408 err = kstrtol(buf, 10, &val); 409 if (err) 410 return err; 411 412 mutex_lock(&data->update_lock); 413 data->temp_low[nr] = TEMP_TO_REG(val); 414 lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]); 415 mutex_unlock(&data->update_lock); 416 return count; 417} 418 419static ssize_t temp_high_store(struct device *dev, 420 struct device_attribute *attr, const char *buf, 421 size_t count) 422{ 423 struct i2c_client *client = dev_get_drvdata(dev); 424 struct lm87_data *data = i2c_get_clientdata(client); 425 int nr = to_sensor_dev_attr(attr)->index; 426 long val; 427 int err; 428 429 err = kstrtol(buf, 10, &val); 430 if (err) 431 return err; 432 433 mutex_lock(&data->update_lock); 434 data->temp_high[nr] = TEMP_TO_REG(val); 435 lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]); 436 mutex_unlock(&data->update_lock); 437 return count; 438} 439 440static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); 441static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0); 442static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0); 443static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1); 444static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1); 445static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1); 446static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2); 447static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2); 448static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2); 449 450static ssize_t temp1_crit_show(struct device *dev, 451 struct device_attribute *attr, char *buf) 452{ 453 struct lm87_data *data = lm87_update_device(dev); 454 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int)); 455} 456 457static ssize_t temp2_crit_show(struct device *dev, 458 struct device_attribute *attr, char *buf) 459{ 460 struct lm87_data *data = lm87_update_device(dev); 461 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext)); 462} 463 464static DEVICE_ATTR_RO(temp1_crit); 465static DEVICE_ATTR_RO(temp2_crit); 466static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL); 467 468static ssize_t fan_input_show(struct device *dev, 469 struct device_attribute *attr, char *buf) 470{ 471 struct lm87_data *data = lm87_update_device(dev); 472 int nr = to_sensor_dev_attr(attr)->index; 473 474 return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr], 475 FAN_DIV_FROM_REG(data->fan_div[nr]))); 476} 477 478static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr, 479 char *buf) 480{ 481 struct lm87_data *data = lm87_update_device(dev); 482 int nr = to_sensor_dev_attr(attr)->index; 483 484 return sprintf(buf, "%d\n", fan_from_reg(data->fan_min[nr], 485 FAN_DIV_FROM_REG(data->fan_div[nr]))); 486} 487 488static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr, 489 char *buf) 490{ 491 struct lm87_data *data = lm87_update_device(dev); 492 int nr = to_sensor_dev_attr(attr)->index; 493 494 return sprintf(buf, "%d\n", 495 FAN_DIV_FROM_REG(data->fan_div[nr])); 496} 497 498static ssize_t fan_min_store(struct device *dev, 499 struct device_attribute *attr, const char *buf, 500 size_t count) 501{ 502 struct i2c_client *client = dev_get_drvdata(dev); 503 struct lm87_data *data = i2c_get_clientdata(client); 504 int nr = to_sensor_dev_attr(attr)->index; 505 long val; 506 int err; 507 508 err = kstrtol(buf, 10, &val); 509 if (err) 510 return err; 511 512 mutex_lock(&data->update_lock); 513 data->fan_min[nr] = FAN_TO_REG(val, 514 FAN_DIV_FROM_REG(data->fan_div[nr])); 515 lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]); 516 mutex_unlock(&data->update_lock); 517 return count; 518} 519 520/* 521 * Note: we save and restore the fan minimum here, because its value is 522 * determined in part by the fan clock divider. This follows the principle 523 * of least surprise; the user doesn't expect the fan minimum to change just 524 * because the divider changed. 525 */ 526static ssize_t fan_div_store(struct device *dev, 527 struct device_attribute *attr, const char *buf, 528 size_t count) 529{ 530 struct i2c_client *client = dev_get_drvdata(dev); 531 struct lm87_data *data = i2c_get_clientdata(client); 532 int nr = to_sensor_dev_attr(attr)->index; 533 long val; 534 int err; 535 unsigned long min; 536 u8 reg; 537 538 err = kstrtol(buf, 10, &val); 539 if (err) 540 return err; 541 542 mutex_lock(&data->update_lock); 543 min = fan_from_reg(data->fan_min[nr], 544 FAN_DIV_FROM_REG(data->fan_div[nr])); 545 546 switch (val) { 547 case 1: 548 data->fan_div[nr] = 0; 549 break; 550 case 2: 551 data->fan_div[nr] = 1; 552 break; 553 case 4: 554 data->fan_div[nr] = 2; 555 break; 556 case 8: 557 data->fan_div[nr] = 3; 558 break; 559 default: 560 mutex_unlock(&data->update_lock); 561 return -EINVAL; 562 } 563 564 reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV); 565 switch (nr) { 566 case 0: 567 reg = (reg & 0xCF) | (data->fan_div[0] << 4); 568 break; 569 case 1: 570 reg = (reg & 0x3F) | (data->fan_div[1] << 6); 571 break; 572 } 573 lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg); 574 575 data->fan_min[nr] = FAN_TO_REG(min, val); 576 lm87_write_value(client, LM87_REG_FAN_MIN(nr), 577 data->fan_min[nr]); 578 mutex_unlock(&data->update_lock); 579 580 return count; 581} 582 583static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0); 584static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); 585static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); 586static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1); 587static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); 588static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); 589 590static ssize_t alarms_show(struct device *dev, struct device_attribute *attr, 591 char *buf) 592{ 593 struct lm87_data *data = lm87_update_device(dev); 594 return sprintf(buf, "%d\n", data->alarms); 595} 596static DEVICE_ATTR_RO(alarms); 597 598static ssize_t cpu0_vid_show(struct device *dev, 599 struct device_attribute *attr, char *buf) 600{ 601 struct lm87_data *data = lm87_update_device(dev); 602 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 603} 604static DEVICE_ATTR_RO(cpu0_vid); 605 606static ssize_t vrm_show(struct device *dev, struct device_attribute *attr, 607 char *buf) 608{ 609 struct lm87_data *data = dev_get_drvdata(dev); 610 return sprintf(buf, "%d\n", data->vrm); 611} 612static ssize_t vrm_store(struct device *dev, struct device_attribute *attr, 613 const char *buf, size_t count) 614{ 615 struct lm87_data *data = dev_get_drvdata(dev); 616 unsigned long val; 617 int err; 618 619 err = kstrtoul(buf, 10, &val); 620 if (err) 621 return err; 622 623 if (val > 255) 624 return -EINVAL; 625 626 data->vrm = val; 627 return count; 628} 629static DEVICE_ATTR_RW(vrm); 630 631static ssize_t aout_output_show(struct device *dev, 632 struct device_attribute *attr, char *buf) 633{ 634 struct lm87_data *data = lm87_update_device(dev); 635 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 636} 637static ssize_t aout_output_store(struct device *dev, 638 struct device_attribute *attr, 639 const char *buf, size_t count) 640{ 641 struct i2c_client *client = dev_get_drvdata(dev); 642 struct lm87_data *data = i2c_get_clientdata(client); 643 long val; 644 int err; 645 646 err = kstrtol(buf, 10, &val); 647 if (err) 648 return err; 649 650 mutex_lock(&data->update_lock); 651 data->aout = AOUT_TO_REG(val); 652 lm87_write_value(client, LM87_REG_AOUT, data->aout); 653 mutex_unlock(&data->update_lock); 654 return count; 655} 656static DEVICE_ATTR_RW(aout_output); 657 658static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, 659 char *buf) 660{ 661 struct lm87_data *data = lm87_update_device(dev); 662 int bitnr = to_sensor_dev_attr(attr)->index; 663 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 664} 665static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0); 666static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1); 667static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2); 668static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3); 669static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8); 670static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9); 671static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6); 672static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7); 673static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4); 674static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5); 675static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5); 676static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6); 677static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7); 678static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14); 679static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15); 680 681/* 682 * Real code 683 */ 684 685static struct attribute *lm87_attributes[] = { 686 &sensor_dev_attr_in1_input.dev_attr.attr, 687 &sensor_dev_attr_in1_min.dev_attr.attr, 688 &sensor_dev_attr_in1_max.dev_attr.attr, 689 &sensor_dev_attr_in1_alarm.dev_attr.attr, 690 &sensor_dev_attr_in2_input.dev_attr.attr, 691 &sensor_dev_attr_in2_min.dev_attr.attr, 692 &sensor_dev_attr_in2_max.dev_attr.attr, 693 &sensor_dev_attr_in2_alarm.dev_attr.attr, 694 &sensor_dev_attr_in3_input.dev_attr.attr, 695 &sensor_dev_attr_in3_min.dev_attr.attr, 696 &sensor_dev_attr_in3_max.dev_attr.attr, 697 &sensor_dev_attr_in3_alarm.dev_attr.attr, 698 &sensor_dev_attr_in4_input.dev_attr.attr, 699 &sensor_dev_attr_in4_min.dev_attr.attr, 700 &sensor_dev_attr_in4_max.dev_attr.attr, 701 &sensor_dev_attr_in4_alarm.dev_attr.attr, 702 703 &sensor_dev_attr_temp1_input.dev_attr.attr, 704 &sensor_dev_attr_temp1_max.dev_attr.attr, 705 &sensor_dev_attr_temp1_min.dev_attr.attr, 706 &dev_attr_temp1_crit.attr, 707 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 708 &sensor_dev_attr_temp2_input.dev_attr.attr, 709 &sensor_dev_attr_temp2_max.dev_attr.attr, 710 &sensor_dev_attr_temp2_min.dev_attr.attr, 711 &dev_attr_temp2_crit.attr, 712 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 713 &sensor_dev_attr_temp2_fault.dev_attr.attr, 714 715 &dev_attr_alarms.attr, 716 &dev_attr_aout_output.attr, 717 718 NULL 719}; 720 721static const struct attribute_group lm87_group = { 722 .attrs = lm87_attributes, 723}; 724 725static struct attribute *lm87_attributes_in6[] = { 726 &sensor_dev_attr_in6_input.dev_attr.attr, 727 &sensor_dev_attr_in6_min.dev_attr.attr, 728 &sensor_dev_attr_in6_max.dev_attr.attr, 729 &sensor_dev_attr_in6_alarm.dev_attr.attr, 730 NULL 731}; 732 733static const struct attribute_group lm87_group_in6 = { 734 .attrs = lm87_attributes_in6, 735}; 736 737static struct attribute *lm87_attributes_fan1[] = { 738 &sensor_dev_attr_fan1_input.dev_attr.attr, 739 &sensor_dev_attr_fan1_min.dev_attr.attr, 740 &sensor_dev_attr_fan1_div.dev_attr.attr, 741 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 742 NULL 743}; 744 745static const struct attribute_group lm87_group_fan1 = { 746 .attrs = lm87_attributes_fan1, 747}; 748 749static struct attribute *lm87_attributes_in7[] = { 750 &sensor_dev_attr_in7_input.dev_attr.attr, 751 &sensor_dev_attr_in7_min.dev_attr.attr, 752 &sensor_dev_attr_in7_max.dev_attr.attr, 753 &sensor_dev_attr_in7_alarm.dev_attr.attr, 754 NULL 755}; 756 757static const struct attribute_group lm87_group_in7 = { 758 .attrs = lm87_attributes_in7, 759}; 760 761static struct attribute *lm87_attributes_fan2[] = { 762 &sensor_dev_attr_fan2_input.dev_attr.attr, 763 &sensor_dev_attr_fan2_min.dev_attr.attr, 764 &sensor_dev_attr_fan2_div.dev_attr.attr, 765 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 766 NULL 767}; 768 769static const struct attribute_group lm87_group_fan2 = { 770 .attrs = lm87_attributes_fan2, 771}; 772 773static struct attribute *lm87_attributes_temp3[] = { 774 &sensor_dev_attr_temp3_input.dev_attr.attr, 775 &sensor_dev_attr_temp3_max.dev_attr.attr, 776 &sensor_dev_attr_temp3_min.dev_attr.attr, 777 &dev_attr_temp3_crit.attr, 778 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 779 &sensor_dev_attr_temp3_fault.dev_attr.attr, 780 NULL 781}; 782 783static const struct attribute_group lm87_group_temp3 = { 784 .attrs = lm87_attributes_temp3, 785}; 786 787static struct attribute *lm87_attributes_in0_5[] = { 788 &sensor_dev_attr_in0_input.dev_attr.attr, 789 &sensor_dev_attr_in0_min.dev_attr.attr, 790 &sensor_dev_attr_in0_max.dev_attr.attr, 791 &sensor_dev_attr_in0_alarm.dev_attr.attr, 792 &sensor_dev_attr_in5_input.dev_attr.attr, 793 &sensor_dev_attr_in5_min.dev_attr.attr, 794 &sensor_dev_attr_in5_max.dev_attr.attr, 795 &sensor_dev_attr_in5_alarm.dev_attr.attr, 796 NULL 797}; 798 799static const struct attribute_group lm87_group_in0_5 = { 800 .attrs = lm87_attributes_in0_5, 801}; 802 803static struct attribute *lm87_attributes_vid[] = { 804 &dev_attr_cpu0_vid.attr, 805 &dev_attr_vrm.attr, 806 NULL 807}; 808 809static const struct attribute_group lm87_group_vid = { 810 .attrs = lm87_attributes_vid, 811}; 812 813/* Return 0 if detection is successful, -ENODEV otherwise */ 814static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info) 815{ 816 struct i2c_adapter *adapter = client->adapter; 817 const char *name; 818 u8 cid, rev; 819 820 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 821 return -ENODEV; 822 823 if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80) 824 return -ENODEV; 825 826 /* Now, we do the remaining detection. */ 827 cid = lm87_read_value(client, LM87_REG_COMPANY_ID); 828 rev = lm87_read_value(client, LM87_REG_REVISION); 829 830 if (cid == 0x02 /* National Semiconductor */ 831 && (rev >= 0x01 && rev <= 0x08)) 832 name = "lm87"; 833 else if (cid == 0x41 /* Analog Devices */ 834 && (rev & 0xf0) == 0x10) 835 name = "adm1024"; 836 else { 837 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n", 838 client->addr); 839 return -ENODEV; 840 } 841 842 strscpy(info->type, name, I2C_NAME_SIZE); 843 844 return 0; 845} 846 847static void lm87_restore_config(void *arg) 848{ 849 struct i2c_client *client = arg; 850 struct lm87_data *data = i2c_get_clientdata(client); 851 852 lm87_write_value(client, LM87_REG_CONFIG, data->config); 853} 854 855static int lm87_init_client(struct i2c_client *client) 856{ 857 struct lm87_data *data = i2c_get_clientdata(client); 858 int rc; 859 struct device_node *of_node = client->dev.of_node; 860 u8 val = 0; 861 struct regulator *vcc = NULL; 862 863 if (of_node) { 864 if (of_property_read_bool(of_node, "has-temp3")) 865 val |= CHAN_TEMP3; 866 if (of_property_read_bool(of_node, "has-in6")) 867 val |= CHAN_NO_FAN(0); 868 if (of_property_read_bool(of_node, "has-in7")) 869 val |= CHAN_NO_FAN(1); 870 vcc = devm_regulator_get_optional(&client->dev, "vcc"); 871 if (!IS_ERR(vcc)) { 872 if (regulator_get_voltage(vcc) == 5000000) 873 val |= CHAN_VCC_5V; 874 } 875 data->channel = val; 876 lm87_write_value(client, 877 LM87_REG_CHANNEL_MODE, data->channel); 878 } else if (dev_get_platdata(&client->dev)) { 879 data->channel = *(u8 *)dev_get_platdata(&client->dev); 880 lm87_write_value(client, 881 LM87_REG_CHANNEL_MODE, data->channel); 882 } else { 883 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE); 884 } 885 data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F; 886 887 rc = devm_add_action(&client->dev, lm87_restore_config, client); 888 if (rc) 889 return rc; 890 891 if (!(data->config & 0x01)) { 892 int i; 893 894 /* Limits are left uninitialized after power-up */ 895 for (i = 1; i < 6; i++) { 896 lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00); 897 lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF); 898 } 899 for (i = 0; i < 2; i++) { 900 lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F); 901 lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00); 902 lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00); 903 lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF); 904 } 905 if (data->channel & CHAN_TEMP3) { 906 lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F); 907 lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00); 908 } else { 909 lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00); 910 lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF); 911 } 912 } 913 914 /* Make sure Start is set and INT#_Clear is clear */ 915 if ((data->config & 0x09) != 0x01) 916 lm87_write_value(client, LM87_REG_CONFIG, 917 (data->config & 0x77) | 0x01); 918 return 0; 919} 920 921static int lm87_probe(struct i2c_client *client) 922{ 923 struct lm87_data *data; 924 struct device *hwmon_dev; 925 int err; 926 unsigned int group_tail = 0; 927 928 data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL); 929 if (!data) 930 return -ENOMEM; 931 932 i2c_set_clientdata(client, data); 933 mutex_init(&data->update_lock); 934 935 /* Initialize the LM87 chip */ 936 err = lm87_init_client(client); 937 if (err) 938 return err; 939 940 data->in_scale[0] = 2500; 941 data->in_scale[1] = 2700; 942 data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300; 943 data->in_scale[3] = 5000; 944 data->in_scale[4] = 12000; 945 data->in_scale[5] = 2700; 946 data->in_scale[6] = 1875; 947 data->in_scale[7] = 1875; 948 949 /* 950 * Construct the list of attributes, the list depends on the 951 * configuration of the chip 952 */ 953 data->attr_groups[group_tail++] = &lm87_group; 954 if (data->channel & CHAN_NO_FAN(0)) 955 data->attr_groups[group_tail++] = &lm87_group_in6; 956 else 957 data->attr_groups[group_tail++] = &lm87_group_fan1; 958 959 if (data->channel & CHAN_NO_FAN(1)) 960 data->attr_groups[group_tail++] = &lm87_group_in7; 961 else 962 data->attr_groups[group_tail++] = &lm87_group_fan2; 963 964 if (data->channel & CHAN_TEMP3) 965 data->attr_groups[group_tail++] = &lm87_group_temp3; 966 else 967 data->attr_groups[group_tail++] = &lm87_group_in0_5; 968 969 if (!(data->channel & CHAN_NO_VID)) { 970 data->vrm = vid_which_vrm(); 971 data->attr_groups[group_tail++] = &lm87_group_vid; 972 } 973 974 hwmon_dev = devm_hwmon_device_register_with_groups( 975 &client->dev, client->name, client, data->attr_groups); 976 return PTR_ERR_OR_ZERO(hwmon_dev); 977} 978 979/* 980 * Driver data (common to all clients) 981 */ 982 983static const struct i2c_device_id lm87_id[] = { 984 { "lm87" }, 985 { "adm1024" }, 986 { } 987}; 988MODULE_DEVICE_TABLE(i2c, lm87_id); 989 990static const struct of_device_id lm87_of_match[] = { 991 { .compatible = "ti,lm87" }, 992 { .compatible = "adi,adm1024" }, 993 { }, 994}; 995MODULE_DEVICE_TABLE(of, lm87_of_match); 996 997static struct i2c_driver lm87_driver = { 998 .class = I2C_CLASS_HWMON, 999 .driver = { 1000 .name = "lm87", 1001 .of_match_table = lm87_of_match, 1002 }, 1003 .probe = lm87_probe, 1004 .id_table = lm87_id, 1005 .detect = lm87_detect, 1006 .address_list = normal_i2c, 1007}; 1008 1009module_i2c_driver(lm87_driver); 1010 1011MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others"); 1012MODULE_DESCRIPTION("LM87 driver"); 1013MODULE_LICENSE("GPL");
~/
Read-only file preview.