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