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 Jean Delvare <khali@linux-fr.org> 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 assumes that 25 * the BIOS configured the chip correctly. In that respect, it differs from 26 * the original driver (from lm_sensors for Linux 2.4), which would force the 27 * LM87 to an arbitrary, compile-time chosen mode, regardless of the actual 28 * chipset wiring. 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 program is free software; you can redistribute it and/or modify 41 * it under the terms of the GNU General Public License as published by 42 * the Free Software Foundation; either version 2 of the License, or 43 * (at your option) any later version. 44 * 45 * This program is distributed in the hope that it will be useful, 46 * but WITHOUT ANY WARRANTY; without even the implied warranty of 47 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 48 * GNU General Public License for more details. 49 * 50 * You should have received a copy of the GNU General Public License 51 * along with this program; if not, write to the Free Software 52 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 53 */ 54 55#include <linux/module.h> 56#include <linux/init.h> 57#include <linux/slab.h> 58#include <linux/jiffies.h> 59#include <linux/i2c.h> 60#include <linux/hwmon.h> 61#include <linux/hwmon-vid.h> 62#include <linux/err.h> 63#include <linux/mutex.h> 64 65/* 66 * Addresses to scan 67 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e. 68 */ 69 70static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 71 72/* 73 * Insmod parameters 74 */ 75 76I2C_CLIENT_INSMOD_1(lm87); 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 91static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 }; 92static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B }; 93static 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) * 192 >= (scale) * 255 ? 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 : (val)+500) / 1000)) 130 131#define FAN_FROM_REG(reg,div) ((reg) == 255 || (reg) == 0 ? 0 : \ 132 1350000 + (reg)*(div) / 2) / ((reg)*(div)) 133#define FAN_TO_REG(val,div) ((val)*(div) * 255 <= 1350000 ? 255 : \ 134 (1350000 + (val)*(div) / 2) / ((val)*(div))) 135 136#define FAN_DIV_FROM_REG(reg) (1 << (reg)) 137 138/* analog out is 9.80mV/LSB */ 139#define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10) 140#define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \ 141 (val) >= 2500 ? 255 : \ 142 ((val) * 10 + 49) / 98) 143 144/* nr in 0..1 */ 145#define CHAN_NO_FAN(nr) (1 << (nr)) 146#define CHAN_TEMP3 (1 << 2) 147#define CHAN_VCC_5V (1 << 3) 148#define CHAN_NO_VID (1 << 8) 149 150/* 151 * Functions declaration 152 */ 153 154static int lm87_attach_adapter(struct i2c_adapter *adapter); 155static int lm87_detect(struct i2c_adapter *adapter, int address, int kind); 156static void lm87_init_client(struct i2c_client *client); 157static int lm87_detach_client(struct i2c_client *client); 158static struct lm87_data *lm87_update_device(struct device *dev); 159 160/* 161 * Driver data (common to all clients) 162 */ 163 164static struct i2c_driver lm87_driver = { 165 .driver = { 166 .name = "lm87", 167 }, 168 .id = I2C_DRIVERID_LM87, 169 .attach_adapter = lm87_attach_adapter, 170 .detach_client = lm87_detach_client, 171}; 172 173/* 174 * Client data (each client gets its own) 175 */ 176 177struct lm87_data { 178 struct i2c_client client; 179 struct class_device *class_dev; 180 struct mutex update_lock; 181 char valid; /* zero until following fields are valid */ 182 unsigned long last_updated; /* In jiffies */ 183 184 u8 channel; /* register value */ 185 186 u8 in[8]; /* register value */ 187 u8 in_max[8]; /* register value */ 188 u8 in_min[8]; /* register value */ 189 u16 in_scale[8]; 190 191 s8 temp[3]; /* register value */ 192 s8 temp_high[3]; /* register value */ 193 s8 temp_low[3]; /* register value */ 194 s8 temp_crit_int; /* min of two register values */ 195 s8 temp_crit_ext; /* min of two register values */ 196 197 u8 fan[2]; /* register value */ 198 u8 fan_min[2]; /* register value */ 199 u8 fan_div[2]; /* register value, shifted right */ 200 u8 aout; /* register value */ 201 202 u16 alarms; /* register values, combined */ 203 u8 vid; /* register values, combined */ 204 u8 vrm; 205}; 206 207/* 208 * Sysfs stuff 209 */ 210 211static inline int lm87_read_value(struct i2c_client *client, u8 reg) 212{ 213 return i2c_smbus_read_byte_data(client, reg); 214} 215 216static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value) 217{ 218 return i2c_smbus_write_byte_data(client, reg, value); 219} 220 221#define show_in(offset) \ 222static ssize_t show_in##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \ 223{ \ 224 struct lm87_data *data = lm87_update_device(dev); \ 225 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \ 226 data->in_scale[offset])); \ 227} \ 228static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \ 229{ \ 230 struct lm87_data *data = lm87_update_device(dev); \ 231 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \ 232 data->in_scale[offset])); \ 233} \ 234static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \ 235{ \ 236 struct lm87_data *data = lm87_update_device(dev); \ 237 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \ 238 data->in_scale[offset])); \ 239} \ 240static DEVICE_ATTR(in##offset##_input, S_IRUGO, \ 241 show_in##offset##_input, NULL); 242show_in(0); 243show_in(1); 244show_in(2); 245show_in(3); 246show_in(4); 247show_in(5); 248show_in(6); 249show_in(7); 250 251static void set_in_min(struct device *dev, const char *buf, int nr) 252{ 253 struct i2c_client *client = to_i2c_client(dev); 254 struct lm87_data *data = i2c_get_clientdata(client); 255 long val = simple_strtol(buf, NULL, 10); 256 257 mutex_lock(&data->update_lock); 258 data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]); 259 lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) : 260 LM87_REG_AIN_MIN(nr-6), data->in_min[nr]); 261 mutex_unlock(&data->update_lock); 262} 263 264static void set_in_max(struct device *dev, const char *buf, int nr) 265{ 266 struct i2c_client *client = to_i2c_client(dev); 267 struct lm87_data *data = i2c_get_clientdata(client); 268 long val = simple_strtol(buf, NULL, 10); 269 270 mutex_lock(&data->update_lock); 271 data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]); 272 lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) : 273 LM87_REG_AIN_MAX(nr-6), data->in_max[nr]); 274 mutex_unlock(&data->update_lock); 275} 276 277#define set_in(offset) \ 278static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, \ 279 const char *buf, size_t count) \ 280{ \ 281 set_in_min(dev, buf, offset); \ 282 return count; \ 283} \ 284static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, \ 285 const char *buf, size_t count) \ 286{ \ 287 set_in_max(dev, buf, offset); \ 288 return count; \ 289} \ 290static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ 291 show_in##offset##_min, set_in##offset##_min); \ 292static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ 293 show_in##offset##_max, set_in##offset##_max); 294set_in(0); 295set_in(1); 296set_in(2); 297set_in(3); 298set_in(4); 299set_in(5); 300set_in(6); 301set_in(7); 302 303#define show_temp(offset) \ 304static ssize_t show_temp##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \ 305{ \ 306 struct lm87_data *data = lm87_update_device(dev); \ 307 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \ 308} \ 309static ssize_t show_temp##offset##_low(struct device *dev, struct device_attribute *attr, char *buf) \ 310{ \ 311 struct lm87_data *data = lm87_update_device(dev); \ 312 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \ 313} \ 314static ssize_t show_temp##offset##_high(struct device *dev, struct device_attribute *attr, char *buf) \ 315{ \ 316 struct lm87_data *data = lm87_update_device(dev); \ 317 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \ 318}\ 319static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \ 320 show_temp##offset##_input, NULL); 321show_temp(1); 322show_temp(2); 323show_temp(3); 324 325static void set_temp_low(struct device *dev, const char *buf, int nr) 326{ 327 struct i2c_client *client = to_i2c_client(dev); 328 struct lm87_data *data = i2c_get_clientdata(client); 329 long val = simple_strtol(buf, NULL, 10); 330 331 mutex_lock(&data->update_lock); 332 data->temp_low[nr] = TEMP_TO_REG(val); 333 lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]); 334 mutex_unlock(&data->update_lock); 335} 336 337static void set_temp_high(struct device *dev, const char *buf, int nr) 338{ 339 struct i2c_client *client = to_i2c_client(dev); 340 struct lm87_data *data = i2c_get_clientdata(client); 341 long val = simple_strtol(buf, NULL, 10); 342 343 mutex_lock(&data->update_lock); 344 data->temp_high[nr] = TEMP_TO_REG(val); 345 lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]); 346 mutex_unlock(&data->update_lock); 347} 348 349#define set_temp(offset) \ 350static ssize_t set_temp##offset##_low(struct device *dev, struct device_attribute *attr, \ 351 const char *buf, size_t count) \ 352{ \ 353 set_temp_low(dev, buf, offset-1); \ 354 return count; \ 355} \ 356static ssize_t set_temp##offset##_high(struct device *dev, struct device_attribute *attr, \ 357 const char *buf, size_t count) \ 358{ \ 359 set_temp_high(dev, buf, offset-1); \ 360 return count; \ 361} \ 362static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \ 363 show_temp##offset##_high, set_temp##offset##_high); \ 364static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \ 365 show_temp##offset##_low, set_temp##offset##_low); 366set_temp(1); 367set_temp(2); 368set_temp(3); 369 370static ssize_t show_temp_crit_int(struct device *dev, struct device_attribute *attr, char *buf) 371{ 372 struct lm87_data *data = lm87_update_device(dev); 373 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int)); 374} 375 376static ssize_t show_temp_crit_ext(struct device *dev, struct device_attribute *attr, char *buf) 377{ 378 struct lm87_data *data = lm87_update_device(dev); 379 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext)); 380} 381 382static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL); 383static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL); 384static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL); 385 386#define show_fan(offset) \ 387static ssize_t show_fan##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \ 388{ \ 389 struct lm87_data *data = lm87_update_device(dev); \ 390 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \ 391 FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \ 392} \ 393static ssize_t show_fan##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \ 394{ \ 395 struct lm87_data *data = lm87_update_device(dev); \ 396 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \ 397 FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \ 398} \ 399static ssize_t show_fan##offset##_div(struct device *dev, struct device_attribute *attr, char *buf) \ 400{ \ 401 struct lm87_data *data = lm87_update_device(dev); \ 402 return sprintf(buf, "%d\n", FAN_DIV_FROM_REG(data->fan_div[offset-1])); \ 403} \ 404static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \ 405 show_fan##offset##_input, NULL); 406show_fan(1); 407show_fan(2); 408 409static void set_fan_min(struct device *dev, const char *buf, int nr) 410{ 411 struct i2c_client *client = to_i2c_client(dev); 412 struct lm87_data *data = i2c_get_clientdata(client); 413 long val = simple_strtol(buf, NULL, 10); 414 415 mutex_lock(&data->update_lock); 416 data->fan_min[nr] = FAN_TO_REG(val, 417 FAN_DIV_FROM_REG(data->fan_div[nr])); 418 lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]); 419 mutex_unlock(&data->update_lock); 420} 421 422/* Note: we save and restore the fan minimum here, because its value is 423 determined in part by the fan clock divider. This follows the principle 424 of least surprise; the user doesn't expect the fan minimum to change just 425 because the divider changed. */ 426static ssize_t set_fan_div(struct device *dev, const char *buf, 427 size_t count, int nr) 428{ 429 struct i2c_client *client = to_i2c_client(dev); 430 struct lm87_data *data = i2c_get_clientdata(client); 431 long val = simple_strtol(buf, NULL, 10); 432 unsigned long min; 433 u8 reg; 434 435 mutex_lock(&data->update_lock); 436 min = FAN_FROM_REG(data->fan_min[nr], 437 FAN_DIV_FROM_REG(data->fan_div[nr])); 438 439 switch (val) { 440 case 1: data->fan_div[nr] = 0; break; 441 case 2: data->fan_div[nr] = 1; break; 442 case 4: data->fan_div[nr] = 2; break; 443 case 8: data->fan_div[nr] = 3; break; 444 default: 445 mutex_unlock(&data->update_lock); 446 return -EINVAL; 447 } 448 449 reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV); 450 switch (nr) { 451 case 0: 452 reg = (reg & 0xCF) | (data->fan_div[0] << 4); 453 break; 454 case 1: 455 reg = (reg & 0x3F) | (data->fan_div[1] << 6); 456 break; 457 } 458 lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg); 459 460 data->fan_min[nr] = FAN_TO_REG(min, val); 461 lm87_write_value(client, LM87_REG_FAN_MIN(nr), 462 data->fan_min[nr]); 463 mutex_unlock(&data->update_lock); 464 465 return count; 466} 467 468#define set_fan(offset) \ 469static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \ 470 size_t count) \ 471{ \ 472 set_fan_min(dev, buf, offset-1); \ 473 return count; \ 474} \ 475static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \ 476 size_t count) \ 477{ \ 478 return set_fan_div(dev, buf, count, offset-1); \ 479} \ 480static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ 481 show_fan##offset##_min, set_fan##offset##_min); \ 482static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \ 483 show_fan##offset##_div, set_fan##offset##_div); 484set_fan(1); 485set_fan(2); 486 487static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) 488{ 489 struct lm87_data *data = lm87_update_device(dev); 490 return sprintf(buf, "%d\n", data->alarms); 491} 492static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 493 494static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf) 495{ 496 struct lm87_data *data = lm87_update_device(dev); 497 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 498} 499static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 500 501static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf) 502{ 503 struct lm87_data *data = lm87_update_device(dev); 504 return sprintf(buf, "%d\n", data->vrm); 505} 506static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 507{ 508 struct i2c_client *client = to_i2c_client(dev); 509 struct lm87_data *data = i2c_get_clientdata(client); 510 data->vrm = simple_strtoul(buf, NULL, 10); 511 return count; 512} 513static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm); 514 515static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf) 516{ 517 struct lm87_data *data = lm87_update_device(dev); 518 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); 519} 520static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 521{ 522 struct i2c_client *client = to_i2c_client(dev); 523 struct lm87_data *data = i2c_get_clientdata(client); 524 long val = simple_strtol(buf, NULL, 10); 525 526 mutex_lock(&data->update_lock); 527 data->aout = AOUT_TO_REG(val); 528 lm87_write_value(client, LM87_REG_AOUT, data->aout); 529 mutex_unlock(&data->update_lock); 530 return count; 531} 532static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout); 533 534/* 535 * Real code 536 */ 537 538static int lm87_attach_adapter(struct i2c_adapter *adapter) 539{ 540 if (!(adapter->class & I2C_CLASS_HWMON)) 541 return 0; 542 return i2c_probe(adapter, &addr_data, lm87_detect); 543} 544 545static struct attribute *lm87_attributes[] = { 546 &dev_attr_in1_input.attr, 547 &dev_attr_in1_min.attr, 548 &dev_attr_in1_max.attr, 549 &dev_attr_in2_input.attr, 550 &dev_attr_in2_min.attr, 551 &dev_attr_in2_max.attr, 552 &dev_attr_in3_input.attr, 553 &dev_attr_in3_min.attr, 554 &dev_attr_in3_max.attr, 555 &dev_attr_in4_input.attr, 556 &dev_attr_in4_min.attr, 557 &dev_attr_in4_max.attr, 558 559 &dev_attr_temp1_input.attr, 560 &dev_attr_temp1_max.attr, 561 &dev_attr_temp1_min.attr, 562 &dev_attr_temp1_crit.attr, 563 &dev_attr_temp2_input.attr, 564 &dev_attr_temp2_max.attr, 565 &dev_attr_temp2_min.attr, 566 &dev_attr_temp2_crit.attr, 567 568 &dev_attr_alarms.attr, 569 &dev_attr_aout_output.attr, 570 571 NULL 572}; 573 574static const struct attribute_group lm87_group = { 575 .attrs = lm87_attributes, 576}; 577 578static struct attribute *lm87_attributes_opt[] = { 579 &dev_attr_in6_input.attr, 580 &dev_attr_in6_min.attr, 581 &dev_attr_in6_max.attr, 582 583 &dev_attr_fan1_input.attr, 584 &dev_attr_fan1_min.attr, 585 &dev_attr_fan1_div.attr, 586 587 &dev_attr_in7_input.attr, 588 &dev_attr_in7_min.attr, 589 &dev_attr_in7_max.attr, 590 591 &dev_attr_fan2_input.attr, 592 &dev_attr_fan2_min.attr, 593 &dev_attr_fan2_div.attr, 594 595 &dev_attr_temp3_input.attr, 596 &dev_attr_temp3_max.attr, 597 &dev_attr_temp3_min.attr, 598 &dev_attr_temp3_crit.attr, 599 600 &dev_attr_in0_input.attr, 601 &dev_attr_in0_min.attr, 602 &dev_attr_in0_max.attr, 603 &dev_attr_in5_input.attr, 604 &dev_attr_in5_min.attr, 605 &dev_attr_in5_max.attr, 606 607 &dev_attr_cpu0_vid.attr, 608 &dev_attr_vrm.attr, 609 610 NULL 611}; 612 613static const struct attribute_group lm87_group_opt = { 614 .attrs = lm87_attributes_opt, 615}; 616 617/* 618 * The following function does more than just detection. If detection 619 * succeeds, it also registers the new chip. 620 */ 621static int lm87_detect(struct i2c_adapter *adapter, int address, int kind) 622{ 623 struct i2c_client *new_client; 624 struct lm87_data *data; 625 int err = 0; 626 627 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 628 goto exit; 629 630 if (!(data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL))) { 631 err = -ENOMEM; 632 goto exit; 633 } 634 635 /* The common I2C client data is placed right before the 636 LM87-specific data. */ 637 new_client = &data->client; 638 i2c_set_clientdata(new_client, data); 639 new_client->addr = address; 640 new_client->adapter = adapter; 641 new_client->driver = &lm87_driver; 642 new_client->flags = 0; 643 644 /* Default to an LM87 if forced */ 645 if (kind == 0) 646 kind = lm87; 647 648 /* Now, we do the remaining detection. */ 649 if (kind < 0) { 650 u8 rev = lm87_read_value(new_client, LM87_REG_REVISION); 651 652 if (rev < 0x01 || rev > 0x08 653 || (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80) 654 || lm87_read_value(new_client, LM87_REG_COMPANY_ID) != 0x02) { 655 dev_dbg(&adapter->dev, 656 "LM87 detection failed at 0x%02x.\n", 657 address); 658 goto exit_free; 659 } 660 } 661 662 /* We can fill in the remaining client fields */ 663 strlcpy(new_client->name, "lm87", I2C_NAME_SIZE); 664 data->valid = 0; 665 mutex_init(&data->update_lock); 666 667 /* Tell the I2C layer a new client has arrived */ 668 if ((err = i2c_attach_client(new_client))) 669 goto exit_free; 670 671 /* Initialize the LM87 chip */ 672 lm87_init_client(new_client); 673 674 data->in_scale[0] = 2500; 675 data->in_scale[1] = 2700; 676 data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300; 677 data->in_scale[3] = 5000; 678 data->in_scale[4] = 12000; 679 data->in_scale[5] = 2700; 680 data->in_scale[6] = 1875; 681 data->in_scale[7] = 1875; 682 683 /* Register sysfs hooks */ 684 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group))) 685 goto exit_detach; 686 687 if (data->channel & CHAN_NO_FAN(0)) { 688 if ((err = device_create_file(&new_client->dev, 689 &dev_attr_in6_input)) 690 || (err = device_create_file(&new_client->dev, 691 &dev_attr_in6_min)) 692 || (err = device_create_file(&new_client->dev, 693 &dev_attr_in6_max))) 694 goto exit_remove; 695 } else { 696 if ((err = device_create_file(&new_client->dev, 697 &dev_attr_fan1_input)) 698 || (err = device_create_file(&new_client->dev, 699 &dev_attr_fan1_min)) 700 || (err = device_create_file(&new_client->dev, 701 &dev_attr_fan1_div))) 702 goto exit_remove; 703 } 704 705 if (data->channel & CHAN_NO_FAN(1)) { 706 if ((err = device_create_file(&new_client->dev, 707 &dev_attr_in7_input)) 708 || (err = device_create_file(&new_client->dev, 709 &dev_attr_in7_min)) 710 || (err = device_create_file(&new_client->dev, 711 &dev_attr_in7_max))) 712 goto exit_remove; 713 } else { 714 if ((err = device_create_file(&new_client->dev, 715 &dev_attr_fan2_input)) 716 || (err = device_create_file(&new_client->dev, 717 &dev_attr_fan2_min)) 718 || (err = device_create_file(&new_client->dev, 719 &dev_attr_fan2_div))) 720 goto exit_remove; 721 } 722 723 if (data->channel & CHAN_TEMP3) { 724 if ((err = device_create_file(&new_client->dev, 725 &dev_attr_temp3_input)) 726 || (err = device_create_file(&new_client->dev, 727 &dev_attr_temp3_max)) 728 || (err = device_create_file(&new_client->dev, 729 &dev_attr_temp3_min)) 730 || (err = device_create_file(&new_client->dev, 731 &dev_attr_temp3_crit))) 732 goto exit_remove; 733 } else { 734 if ((err = device_create_file(&new_client->dev, 735 &dev_attr_in0_input)) 736 || (err = device_create_file(&new_client->dev, 737 &dev_attr_in0_min)) 738 || (err = device_create_file(&new_client->dev, 739 &dev_attr_in0_max)) 740 || (err = device_create_file(&new_client->dev, 741 &dev_attr_in5_input)) 742 || (err = device_create_file(&new_client->dev, 743 &dev_attr_in5_min)) 744 || (err = device_create_file(&new_client->dev, 745 &dev_attr_in5_max))) 746 goto exit_remove; 747 } 748 749 if (!(data->channel & CHAN_NO_VID)) { 750 data->vrm = vid_which_vrm(); 751 if ((err = device_create_file(&new_client->dev, 752 &dev_attr_cpu0_vid)) 753 || (err = device_create_file(&new_client->dev, 754 &dev_attr_vrm))) 755 goto exit_remove; 756 } 757 758 data->class_dev = hwmon_device_register(&new_client->dev); 759 if (IS_ERR(data->class_dev)) { 760 err = PTR_ERR(data->class_dev); 761 goto exit_remove; 762 } 763 764 return 0; 765 766exit_remove: 767 sysfs_remove_group(&new_client->dev.kobj, &lm87_group); 768 sysfs_remove_group(&new_client->dev.kobj, &lm87_group_opt); 769exit_detach: 770 i2c_detach_client(new_client); 771exit_free: 772 kfree(data); 773exit: 774 return err; 775} 776 777static void lm87_init_client(struct i2c_client *client) 778{ 779 struct lm87_data *data = i2c_get_clientdata(client); 780 u8 config; 781 782 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE); 783 784 config = lm87_read_value(client, LM87_REG_CONFIG); 785 if (!(config & 0x01)) { 786 int i; 787 788 /* Limits are left uninitialized after power-up */ 789 for (i = 1; i < 6; i++) { 790 lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00); 791 lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF); 792 } 793 for (i = 0; i < 2; i++) { 794 lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F); 795 lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00); 796 lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00); 797 lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF); 798 } 799 if (data->channel & CHAN_TEMP3) { 800 lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F); 801 lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00); 802 } else { 803 lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00); 804 lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF); 805 } 806 } 807 if ((config & 0x81) != 0x01) { 808 /* Start monitoring */ 809 lm87_write_value(client, LM87_REG_CONFIG, 810 (config & 0xF7) | 0x01); 811 } 812} 813 814static int lm87_detach_client(struct i2c_client *client) 815{ 816 struct lm87_data *data = i2c_get_clientdata(client); 817 int err; 818 819 hwmon_device_unregister(data->class_dev); 820 sysfs_remove_group(&client->dev.kobj, &lm87_group); 821 sysfs_remove_group(&client->dev.kobj, &lm87_group_opt); 822 823 if ((err = i2c_detach_client(client))) 824 return err; 825 826 kfree(data); 827 return 0; 828} 829 830static struct lm87_data *lm87_update_device(struct device *dev) 831{ 832 struct i2c_client *client = to_i2c_client(dev); 833 struct lm87_data *data = i2c_get_clientdata(client); 834 835 mutex_lock(&data->update_lock); 836 837 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 838 int i, j; 839 840 dev_dbg(&client->dev, "Updating data.\n"); 841 842 i = (data->channel & CHAN_TEMP3) ? 1 : 0; 843 j = (data->channel & CHAN_TEMP3) ? 5 : 6; 844 for (; i < j; i++) { 845 data->in[i] = lm87_read_value(client, 846 LM87_REG_IN(i)); 847 data->in_min[i] = lm87_read_value(client, 848 LM87_REG_IN_MIN(i)); 849 data->in_max[i] = lm87_read_value(client, 850 LM87_REG_IN_MAX(i)); 851 } 852 853 for (i = 0; i < 2; i++) { 854 if (data->channel & CHAN_NO_FAN(i)) { 855 data->in[6+i] = lm87_read_value(client, 856 LM87_REG_AIN(i)); 857 data->in_max[6+i] = lm87_read_value(client, 858 LM87_REG_AIN_MAX(i)); 859 data->in_min[6+i] = lm87_read_value(client, 860 LM87_REG_AIN_MIN(i)); 861 862 } else { 863 data->fan[i] = lm87_read_value(client, 864 LM87_REG_FAN(i)); 865 data->fan_min[i] = lm87_read_value(client, 866 LM87_REG_FAN_MIN(i)); 867 } 868 } 869 870 j = (data->channel & CHAN_TEMP3) ? 3 : 2; 871 for (i = 0 ; i < j; i++) { 872 data->temp[i] = lm87_read_value(client, 873 LM87_REG_TEMP[i]); 874 data->temp_high[i] = lm87_read_value(client, 875 LM87_REG_TEMP_HIGH[i]); 876 data->temp_low[i] = lm87_read_value(client, 877 LM87_REG_TEMP_LOW[i]); 878 } 879 880 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK); 881 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT); 882 data->temp_crit_int = min(i, j); 883 884 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK); 885 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT); 886 data->temp_crit_ext = min(i, j); 887 888 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV); 889 data->fan_div[0] = (i >> 4) & 0x03; 890 data->fan_div[1] = (i >> 6) & 0x03; 891 data->vid = (i & 0x0F) 892 | (lm87_read_value(client, LM87_REG_VID4) & 0x01) 893 << 4; 894 895 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1) 896 | (lm87_read_value(client, LM87_REG_ALARMS2) 897 << 8); 898 data->aout = lm87_read_value(client, LM87_REG_AOUT); 899 900 data->last_updated = jiffies; 901 data->valid = 1; 902 } 903 904 mutex_unlock(&data->update_lock); 905 906 return data; 907} 908 909static int __init sensors_lm87_init(void) 910{ 911 return i2c_add_driver(&lm87_driver); 912} 913 914static void __exit sensors_lm87_exit(void) 915{ 916 i2c_del_driver(&lm87_driver); 917} 918 919MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others"); 920MODULE_DESCRIPTION("LM87 driver"); 921MODULE_LICENSE("GPL"); 922 923module_init(sensors_lm87_init); 924module_exit(sensors_lm87_exit); 925