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 in_input_show(struct device *dev, 280 struct device_attribute *attr, 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 in_min_show(struct device *dev, struct device_attribute *attr, 290 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 in_max_show(struct device *dev, struct device_attribute *attr, 300 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 in_min_store(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 in_max_store(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 static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0); 352 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0); 353 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0); 354 static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1); 355 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1); 356 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1); 357 static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2); 358 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2); 359 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2); 360 static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3); 361 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3); 362 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3); 363 static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4); 364 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4); 365 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4); 366 static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5); 367 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5); 368 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5); 369 static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6); 370 static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6); 371 static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6); 372 static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7); 373 static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7); 374 static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7); 375 376 static ssize_t temp_input_show(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", TEMP_FROM_REG(data->temp[nr])); 383 } 384 385 static ssize_t temp_low_show(struct device *dev, 386 struct device_attribute *attr, char *buf) 387 { 388 struct lm87_data *data = lm87_update_device(dev); 389 int nr = to_sensor_dev_attr(attr)->index; 390 391 return sprintf(buf, "%d\n", 392 TEMP_FROM_REG(data->temp_low[nr])); 393 } 394 395 static ssize_t temp_high_show(struct device *dev, 396 struct device_attribute *attr, char *buf) 397 { 398 struct lm87_data *data = lm87_update_device(dev); 399 int nr = to_sensor_dev_attr(attr)->index; 400 401 return sprintf(buf, "%d\n", 402 TEMP_FROM_REG(data->temp_high[nr])); 403 } 404 405 static ssize_t temp_low_store(struct device *dev, 406 struct device_attribute *attr, const char *buf, 407 size_t count) 408 { 409 struct i2c_client *client = dev_get_drvdata(dev); 410 struct lm87_data *data = i2c_get_clientdata(client); 411 int nr = to_sensor_dev_attr(attr)->index; 412 long val; 413 int err; 414 415 err = kstrtol(buf, 10, &val); 416 if (err) 417 return err; 418 419 mutex_lock(&data->update_lock); 420 data->temp_low[nr] = TEMP_TO_REG(val); 421 lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]); 422 mutex_unlock(&data->update_lock); 423 return count; 424 } 425 426 static ssize_t temp_high_store(struct device *dev, 427 struct device_attribute *attr, const char *buf, 428 size_t count) 429 { 430 struct i2c_client *client = dev_get_drvdata(dev); 431 struct lm87_data *data = i2c_get_clientdata(client); 432 int nr = to_sensor_dev_attr(attr)->index; 433 long val; 434 int err; 435 436 err = kstrtol(buf, 10, &val); 437 if (err) 438 return err; 439 440 mutex_lock(&data->update_lock); 441 data->temp_high[nr] = TEMP_TO_REG(val); 442 lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]); 443 mutex_unlock(&data->update_lock); 444 return count; 445 } 446 447 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); 448 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0); 449 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0); 450 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1); 451 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1); 452 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1); 453 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2); 454 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2); 455 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2); 456 457 static ssize_t temp1_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_int)); 462 } 463 464 static ssize_t temp2_crit_show(struct device *dev, 465 struct device_attribute *attr, char *buf) 466 { 467 struct lm87_data *data = lm87_update_device(dev); 468 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext)); 469 } 470 471 static DEVICE_ATTR_RO(temp1_crit); 472 static DEVICE_ATTR_RO(temp2_crit); 473 static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL); 474 475 static ssize_t fan_input_show(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[nr], 482 FAN_DIV_FROM_REG(data->fan_div[nr]))); 483 } 484 485 static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr, 486 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", FAN_FROM_REG(data->fan_min[nr], 492 FAN_DIV_FROM_REG(data->fan_div[nr]))); 493 } 494 495 static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr, 496 char *buf) 497 { 498 struct lm87_data *data = lm87_update_device(dev); 499 int nr = to_sensor_dev_attr(attr)->index; 500 501 return sprintf(buf, "%d\n", 502 FAN_DIV_FROM_REG(data->fan_div[nr])); 503 } 504 505 static ssize_t fan_min_store(struct device *dev, 506 struct device_attribute *attr, const char *buf, 507 size_t count) 508 { 509 struct i2c_client *client = dev_get_drvdata(dev); 510 struct lm87_data *data = i2c_get_clientdata(client); 511 int nr = to_sensor_dev_attr(attr)->index; 512 long val; 513 int err; 514 515 err = kstrtol(buf, 10, &val); 516 if (err) 517 return err; 518 519 mutex_lock(&data->update_lock); 520 data->fan_min[nr] = FAN_TO_REG(val, 521 FAN_DIV_FROM_REG(data->fan_div[nr])); 522 lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]); 523 mutex_unlock(&data->update_lock); 524 return count; 525 } 526 527 /* 528 * Note: we save and restore the fan minimum here, because its value is 529 * determined in part by the fan clock divider. This follows the principle 530 * of least surprise; the user doesn't expect the fan minimum to change just 531 * because the divider changed. 532 */ 533 static ssize_t fan_div_store(struct device *dev, 534 struct device_attribute *attr, const char *buf, 535 size_t count) 536 { 537 struct i2c_client *client = dev_get_drvdata(dev); 538 struct lm87_data *data = i2c_get_clientdata(client); 539 int nr = to_sensor_dev_attr(attr)->index; 540 long val; 541 int err; 542 unsigned long min; 543 u8 reg; 544 545 err = kstrtol(buf, 10, &val); 546 if (err) 547 return err; 548 549 mutex_lock(&data->update_lock); 550 min = FAN_FROM_REG(data->fan_min[nr], 551 FAN_DIV_FROM_REG(data->fan_div[nr])); 552 553 switch (val) { 554 case 1: 555 data->fan_div[nr] = 0; 556 break; 557 case 2: 558 data->fan_div[nr] = 1; 559 break; 560 case 4: 561 data->fan_div[nr] = 2; 562 break; 563 case 8: 564 data->fan_div[nr] = 3; 565 break; 566 default: 567 mutex_unlock(&data->update_lock); 568 return -EINVAL; 569 } 570 571 reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV); 572 switch (nr) { 573 case 0: 574 reg = (reg & 0xCF) | (data->fan_div[0] << 4); 575 break; 576 case 1: 577 reg = (reg & 0x3F) | (data->fan_div[1] << 6); 578 break; 579 } 580 lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg); 581 582 data->fan_min[nr] = FAN_TO_REG(min, val); 583 lm87_write_value(client, LM87_REG_FAN_MIN(nr), 584 data->fan_min[nr]); 585 mutex_unlock(&data->update_lock); 586 587 return count; 588 } 589 590 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0); 591 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); 592 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); 593 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1); 594 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); 595 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); 596 597 static ssize_t alarms_show(struct device *dev, struct device_attribute *attr, 598 char *buf) 599 { 600 struct lm87_data *data = lm87_update_device(dev); 601 return sprintf(buf, "%d\n", data->alarms); 602 } 603 static DEVICE_ATTR_RO(alarms); 604 605 static ssize_t cpu0_vid_show(struct device *dev, 606 struct device_attribute *attr, char *buf) 607 { 608 struct lm87_data *data = lm87_update_device(dev); 609 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 610 } 611 static DEVICE_ATTR_RO(cpu0_vid); 612 613 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr, 614 char *buf) 615 { 616 struct lm87_data *data = dev_get_drvdata(dev); 617 return sprintf(buf, "%d\n", data->vrm); 618 } 619 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr, 620 const char *buf, size_t count) 621 { 622 struct lm87_data *data = dev_get_drvdata(dev); 623 unsigned long val; 624 int err; 625 626 err = kstrtoul(buf, 10, &val); 627 if (err) 628 return err; 629 630 if (val > 255) 631 return -EINVAL; 632 633 data->vrm = val; 634 return count; 635 } 636 static DEVICE_ATTR_RW(vrm); 637 638 static ssize_t aout_output_show(struct device *dev, 639 struct device_attribute *attr, char *buf) 640 { 641 struct lm87_data *data = lm87_update_device(dev); 642 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 643 } 644 static ssize_t aout_output_store(struct device *dev, 645 struct device_attribute *attr, 646 const char *buf, size_t count) 647 { 648 struct i2c_client *client = dev_get_drvdata(dev); 649 struct lm87_data *data = i2c_get_clientdata(client); 650 long val; 651 int err; 652 653 err = kstrtol(buf, 10, &val); 654 if (err) 655 return err; 656 657 mutex_lock(&data->update_lock); 658 data->aout = AOUT_TO_REG(val); 659 lm87_write_value(client, LM87_REG_AOUT, data->aout); 660 mutex_unlock(&data->update_lock); 661 return count; 662 } 663 static DEVICE_ATTR_RW(aout_output); 664 665 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, 666 char *buf) 667 { 668 struct lm87_data *data = lm87_update_device(dev); 669 int bitnr = to_sensor_dev_attr(attr)->index; 670 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 671 } 672 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0); 673 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1); 674 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2); 675 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3); 676 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8); 677 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9); 678 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6); 679 static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7); 680 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4); 681 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5); 682 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5); 683 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6); 684 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7); 685 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14); 686 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15); 687 688 /* 689 * Real code 690 */ 691 692 static struct attribute *lm87_attributes[] = { 693 &sensor_dev_attr_in1_input.dev_attr.attr, 694 &sensor_dev_attr_in1_min.dev_attr.attr, 695 &sensor_dev_attr_in1_max.dev_attr.attr, 696 &sensor_dev_attr_in1_alarm.dev_attr.attr, 697 &sensor_dev_attr_in2_input.dev_attr.attr, 698 &sensor_dev_attr_in2_min.dev_attr.attr, 699 &sensor_dev_attr_in2_max.dev_attr.attr, 700 &sensor_dev_attr_in2_alarm.dev_attr.attr, 701 &sensor_dev_attr_in3_input.dev_attr.attr, 702 &sensor_dev_attr_in3_min.dev_attr.attr, 703 &sensor_dev_attr_in3_max.dev_attr.attr, 704 &sensor_dev_attr_in3_alarm.dev_attr.attr, 705 &sensor_dev_attr_in4_input.dev_attr.attr, 706 &sensor_dev_attr_in4_min.dev_attr.attr, 707 &sensor_dev_attr_in4_max.dev_attr.attr, 708 &sensor_dev_attr_in4_alarm.dev_attr.attr, 709 710 &sensor_dev_attr_temp1_input.dev_attr.attr, 711 &sensor_dev_attr_temp1_max.dev_attr.attr, 712 &sensor_dev_attr_temp1_min.dev_attr.attr, 713 &dev_attr_temp1_crit.attr, 714 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 715 &sensor_dev_attr_temp2_input.dev_attr.attr, 716 &sensor_dev_attr_temp2_max.dev_attr.attr, 717 &sensor_dev_attr_temp2_min.dev_attr.attr, 718 &dev_attr_temp2_crit.attr, 719 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 720 &sensor_dev_attr_temp2_fault.dev_attr.attr, 721 722 &dev_attr_alarms.attr, 723 &dev_attr_aout_output.attr, 724 725 NULL 726 }; 727 728 static const struct attribute_group lm87_group = { 729 .attrs = lm87_attributes, 730 }; 731 732 static struct attribute *lm87_attributes_in6[] = { 733 &sensor_dev_attr_in6_input.dev_attr.attr, 734 &sensor_dev_attr_in6_min.dev_attr.attr, 735 &sensor_dev_attr_in6_max.dev_attr.attr, 736 &sensor_dev_attr_in6_alarm.dev_attr.attr, 737 NULL 738 }; 739 740 static const struct attribute_group lm87_group_in6 = { 741 .attrs = lm87_attributes_in6, 742 }; 743 744 static struct attribute *lm87_attributes_fan1[] = { 745 &sensor_dev_attr_fan1_input.dev_attr.attr, 746 &sensor_dev_attr_fan1_min.dev_attr.attr, 747 &sensor_dev_attr_fan1_div.dev_attr.attr, 748 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 749 NULL 750 }; 751 752 static const struct attribute_group lm87_group_fan1 = { 753 .attrs = lm87_attributes_fan1, 754 }; 755 756 static struct attribute *lm87_attributes_in7[] = { 757 &sensor_dev_attr_in7_input.dev_attr.attr, 758 &sensor_dev_attr_in7_min.dev_attr.attr, 759 &sensor_dev_attr_in7_max.dev_attr.attr, 760 &sensor_dev_attr_in7_alarm.dev_attr.attr, 761 NULL 762 }; 763 764 static const struct attribute_group lm87_group_in7 = { 765 .attrs = lm87_attributes_in7, 766 }; 767 768 static struct attribute *lm87_attributes_fan2[] = { 769 &sensor_dev_attr_fan2_input.dev_attr.attr, 770 &sensor_dev_attr_fan2_min.dev_attr.attr, 771 &sensor_dev_attr_fan2_div.dev_attr.attr, 772 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 773 NULL 774 }; 775 776 static const struct attribute_group lm87_group_fan2 = { 777 .attrs = lm87_attributes_fan2, 778 }; 779 780 static struct attribute *lm87_attributes_temp3[] = { 781 &sensor_dev_attr_temp3_input.dev_attr.attr, 782 &sensor_dev_attr_temp3_max.dev_attr.attr, 783 &sensor_dev_attr_temp3_min.dev_attr.attr, 784 &dev_attr_temp3_crit.attr, 785 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 786 &sensor_dev_attr_temp3_fault.dev_attr.attr, 787 NULL 788 }; 789 790 static const struct attribute_group lm87_group_temp3 = { 791 .attrs = lm87_attributes_temp3, 792 }; 793 794 static struct attribute *lm87_attributes_in0_5[] = { 795 &sensor_dev_attr_in0_input.dev_attr.attr, 796 &sensor_dev_attr_in0_min.dev_attr.attr, 797 &sensor_dev_attr_in0_max.dev_attr.attr, 798 &sensor_dev_attr_in0_alarm.dev_attr.attr, 799 &sensor_dev_attr_in5_input.dev_attr.attr, 800 &sensor_dev_attr_in5_min.dev_attr.attr, 801 &sensor_dev_attr_in5_max.dev_attr.attr, 802 &sensor_dev_attr_in5_alarm.dev_attr.attr, 803 NULL 804 }; 805 806 static const struct attribute_group lm87_group_in0_5 = { 807 .attrs = lm87_attributes_in0_5, 808 }; 809 810 static struct attribute *lm87_attributes_vid[] = { 811 &dev_attr_cpu0_vid.attr, 812 &dev_attr_vrm.attr, 813 NULL 814 }; 815 816 static const struct attribute_group lm87_group_vid = { 817 .attrs = lm87_attributes_vid, 818 }; 819 820 /* Return 0 if detection is successful, -ENODEV otherwise */ 821 static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info) 822 { 823 struct i2c_adapter *adapter = client->adapter; 824 const char *name; 825 u8 cid, rev; 826 827 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 828 return -ENODEV; 829 830 if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80) 831 return -ENODEV; 832 833 /* Now, we do the remaining detection. */ 834 cid = lm87_read_value(client, LM87_REG_COMPANY_ID); 835 rev = lm87_read_value(client, LM87_REG_REVISION); 836 837 if (cid == 0x02 /* National Semiconductor */ 838 && (rev >= 0x01 && rev <= 0x08)) 839 name = "lm87"; 840 else if (cid == 0x41 /* Analog Devices */ 841 && (rev & 0xf0) == 0x10) 842 name = "adm1024"; 843 else { 844 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n", 845 client->addr); 846 return -ENODEV; 847 } 848 849 strlcpy(info->type, name, I2C_NAME_SIZE); 850 851 return 0; 852 } 853 854 static void lm87_restore_config(void *arg) 855 { 856 struct i2c_client *client = arg; 857 struct lm87_data *data = i2c_get_clientdata(client); 858 859 lm87_write_value(client, LM87_REG_CONFIG, data->config); 860 } 861 862 static int lm87_init_client(struct i2c_client *client) 863 { 864 struct lm87_data *data = i2c_get_clientdata(client); 865 int rc; 866 struct device_node *of_node = client->dev.of_node; 867 u8 val = 0; 868 struct regulator *vcc = NULL; 869 870 if (of_node) { 871 if (of_property_read_bool(of_node, "has-temp3")) 872 val |= CHAN_TEMP3; 873 if (of_property_read_bool(of_node, "has-in6")) 874 val |= CHAN_NO_FAN(0); 875 if (of_property_read_bool(of_node, "has-in7")) 876 val |= CHAN_NO_FAN(1); 877 vcc = devm_regulator_get_optional(&client->dev, "vcc"); 878 if (!IS_ERR(vcc)) { 879 if (regulator_get_voltage(vcc) == 5000000) 880 val |= CHAN_VCC_5V; 881 } 882 data->channel = val; 883 lm87_write_value(client, 884 LM87_REG_CHANNEL_MODE, data->channel); 885 } else if (dev_get_platdata(&client->dev)) { 886 data->channel = *(u8 *)dev_get_platdata(&client->dev); 887 lm87_write_value(client, 888 LM87_REG_CHANNEL_MODE, data->channel); 889 } else { 890 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE); 891 } 892 data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F; 893 894 rc = devm_add_action(&client->dev, lm87_restore_config, client); 895 if (rc) 896 return rc; 897 898 if (!(data->config & 0x01)) { 899 int i; 900 901 /* Limits are left uninitialized after power-up */ 902 for (i = 1; i < 6; i++) { 903 lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00); 904 lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF); 905 } 906 for (i = 0; i < 2; i++) { 907 lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F); 908 lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00); 909 lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00); 910 lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF); 911 } 912 if (data->channel & CHAN_TEMP3) { 913 lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F); 914 lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00); 915 } else { 916 lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00); 917 lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF); 918 } 919 } 920 921 /* Make sure Start is set and INT#_Clear is clear */ 922 if ((data->config & 0x09) != 0x01) 923 lm87_write_value(client, LM87_REG_CONFIG, 924 (data->config & 0x77) | 0x01); 925 return 0; 926 } 927 928 static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id) 929 { 930 struct lm87_data *data; 931 struct device *hwmon_dev; 932 int err; 933 unsigned int group_tail = 0; 934 935 data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL); 936 if (!data) 937 return -ENOMEM; 938 939 i2c_set_clientdata(client, data); 940 mutex_init(&data->update_lock); 941 942 /* Initialize the LM87 chip */ 943 err = lm87_init_client(client); 944 if (err) 945 return err; 946 947 data->in_scale[0] = 2500; 948 data->in_scale[1] = 2700; 949 data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300; 950 data->in_scale[3] = 5000; 951 data->in_scale[4] = 12000; 952 data->in_scale[5] = 2700; 953 data->in_scale[6] = 1875; 954 data->in_scale[7] = 1875; 955 956 /* 957 * Construct the list of attributes, the list depends on the 958 * configuration of the chip 959 */ 960 data->attr_groups[group_tail++] = &lm87_group; 961 if (data->channel & CHAN_NO_FAN(0)) 962 data->attr_groups[group_tail++] = &lm87_group_in6; 963 else 964 data->attr_groups[group_tail++] = &lm87_group_fan1; 965 966 if (data->channel & CHAN_NO_FAN(1)) 967 data->attr_groups[group_tail++] = &lm87_group_in7; 968 else 969 data->attr_groups[group_tail++] = &lm87_group_fan2; 970 971 if (data->channel & CHAN_TEMP3) 972 data->attr_groups[group_tail++] = &lm87_group_temp3; 973 else 974 data->attr_groups[group_tail++] = &lm87_group_in0_5; 975 976 if (!(data->channel & CHAN_NO_VID)) { 977 data->vrm = vid_which_vrm(); 978 data->attr_groups[group_tail++] = &lm87_group_vid; 979 } 980 981 hwmon_dev = devm_hwmon_device_register_with_groups( 982 &client->dev, client->name, client, data->attr_groups); 983 return PTR_ERR_OR_ZERO(hwmon_dev); 984 } 985 986 /* 987 * Driver data (common to all clients) 988 */ 989 990 static const struct i2c_device_id lm87_id[] = { 991 { "lm87", 0 }, 992 { "adm1024", 0 }, 993 { } 994 }; 995 MODULE_DEVICE_TABLE(i2c, lm87_id); 996 997 static const struct of_device_id lm87_of_match[] = { 998 { .compatible = "ti,lm87" }, 999 { .compatible = "adi,adm1024" }, 1000 { }, 1001 }; 1002 MODULE_DEVICE_TABLE(of, lm87_of_match); 1003 1004 static struct i2c_driver lm87_driver = { 1005 .class = I2C_CLASS_HWMON, 1006 .driver = { 1007 .name = "lm87", 1008 .of_match_table = lm87_of_match, 1009 }, 1010 .probe = lm87_probe, 1011 .id_table = lm87_id, 1012 .detect = lm87_detect, 1013 .address_list = normal_i2c, 1014 }; 1015 1016 module_i2c_driver(lm87_driver); 1017 1018 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others"); 1019 MODULE_DESCRIPTION("LM87 driver"); 1020 MODULE_LICENSE("GPL"); 1021