drivers/hwmon/lm87.c

   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 <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 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  *   http://www.analog.com/en/prod/0,2877,ADM1024,00.html
  44  *
  45  * This program is free software; you can redistribute it and/or modify
  46  * it under the terms of the GNU General Public License as published by
  47  * the Free Software Foundation; either version 2 of the License, or
  48  * (at your option) any later version.
  49  *
  50  * This program is distributed in the hope that it will be useful,
  51  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  52  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  53  * GNU General Public License for more details.
  54  *
  55  * You should have received a copy of the GNU General Public License
  56  * along with this program; if not, write to the Free Software
  57  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  58  */
  59
  60 #include <linux/module.h>
  61 #include <linux/init.h>
  62 #include <linux/slab.h>
  63 #include <linux/jiffies.h>
  64 #include <linux/i2c.h>
  65 #include <linux/hwmon.h>
  66 #include <linux/hwmon-sysfs.h>
  67 #include <linux/hwmon-vid.h>
  68 #include <linux/err.h>
  69 #include <linux/mutex.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  * Insmod parameters
  80  */
  81
  82 I2C_CLIENT_INSMOD_2(lm87, adm1024);
  83
  84 /*
  85  * The LM87 registers
  86  */
  87
  88 /* nr in 0..5 */
  89 #define LM87_REG_IN(nr)                 (0x20 + (nr))
  90 #define LM87_REG_IN_MAX(nr)             (0x2B + (nr) * 2)
  91 #define LM87_REG_IN_MIN(nr)             (0x2C + (nr) * 2)
  92 /* nr in 0..1 */
  93 #define LM87_REG_AIN(nr)                (0x28 + (nr))
  94 #define LM87_REG_AIN_MIN(nr)            (0x1A + (nr))
  95 #define LM87_REG_AIN_MAX(nr)            (0x3B + (nr))
  96
  97 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  98 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  99 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
 100
 101 #define LM87_REG_TEMP_HW_INT_LOCK       0x13
 102 #define LM87_REG_TEMP_HW_EXT_LOCK       0x14
 103 #define LM87_REG_TEMP_HW_INT            0x17
 104 #define LM87_REG_TEMP_HW_EXT            0x18
 105
 106 /* nr in 0..1 */
 107 #define LM87_REG_FAN(nr)                (0x28 + (nr))
 108 #define LM87_REG_FAN_MIN(nr)            (0x3B + (nr))
 109 #define LM87_REG_AOUT                   0x19
 110
 111 #define LM87_REG_CONFIG                 0x40
 112 #define LM87_REG_CHANNEL_MODE           0x16
 113 #define LM87_REG_VID_FAN_DIV            0x47
 114 #define LM87_REG_VID4                   0x49
 115
 116 #define LM87_REG_ALARMS1                0x41
 117 #define LM87_REG_ALARMS2                0x42
 118
 119 #define LM87_REG_COMPANY_ID             0x3E
 120 #define LM87_REG_REVISION               0x3F
 121
 122 /*
 123  * Conversions and various macros
 124  * The LM87 uses signed 8-bit values for temperatures.
 125  */
 126
 127 #define IN_FROM_REG(reg,scale)  (((reg) * (scale) + 96) / 192)
 128 #define IN_TO_REG(val,scale)    ((val) <= 0 ? 0 : \
 129                                  (val) * 192 >= (scale) * 255 ? 255 : \
 130                                  ((val) * 192 + (scale)/2) / (scale))
 131
 132 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
 133 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 134                                  (val) >= 126500 ? 127 : \
 135                                  (((val) < 0 ? (val)-500 : (val)+500) / 1000))
 136
 137 #define FAN_FROM_REG(reg,div)   ((reg) == 255 || (reg) == 0 ? 0 : \
 138                                  (1350000 + (reg)*(div) / 2) / ((reg)*(div)))
 139 #define FAN_TO_REG(val,div)     ((val)*(div) * 255 <= 1350000 ? 255 : \
 140                                  (1350000 + (val)*(div) / 2) / ((val)*(div)))
 141
 142 #define FAN_DIV_FROM_REG(reg)   (1 << (reg))
 143
 144 /* analog out is 9.80mV/LSB */
 145 #define AOUT_FROM_REG(reg)      (((reg) * 98 + 5) / 10)
 146 #define AOUT_TO_REG(val)        ((val) <= 0 ? 0 : \
 147                                  (val) >= 2500 ? 255 : \
 148                                  ((val) * 10 + 49) / 98)
 149
 150 /* nr in 0..1 */
 151 #define CHAN_NO_FAN(nr)         (1 << (nr))
 152 #define CHAN_TEMP3              (1 << 2)
 153 #define CHAN_VCC_5V             (1 << 3)
 154 #define CHAN_NO_VID             (1 << 7)
 155
 156 /*
 157  * Functions declaration
 158  */
 159
 160 static int lm87_probe(struct i2c_client *client,
 161                       const struct i2c_device_id *id);
 162 static int lm87_detect(struct i2c_client *new_client, int kind,
 163                        struct i2c_board_info *info);
 164 static void lm87_init_client(struct i2c_client *client);
 165 static int lm87_remove(struct i2c_client *client);
 166 static struct lm87_data *lm87_update_device(struct device *dev);
 167
 168 /*
 169  * Driver data (common to all clients)
 170  */
 171
 172 static const struct i2c_device_id lm87_id[] = {
 173         { "lm87", lm87 },
 174         { "adm1024", adm1024 },
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(i2c, lm87_id);
 178
 179 static struct i2c_driver lm87_driver = {
 180         .class          = I2C_CLASS_HWMON,
 181         .driver = {
 182                 .name   = "lm87",
 183         },
 184         .probe          = lm87_probe,
 185         .remove         = lm87_remove,
 186         .id_table       = lm87_id,
 187         .detect         = lm87_detect,
 188         .address_data   = &addr_data,
 189 };
 190
 191 /*
 192  * Client data (each client gets its own)
 193  */
 194
 195 struct lm87_data {
 196         struct device *hwmon_dev;
 197         struct mutex update_lock;
 198         char valid; /* zero until following fields are valid */
 199         unsigned long last_updated; /* In jiffies */
 200
 201         u8 channel;             /* register value */
 202         u8 config;              /* original register value */
 203
 204         u8 in[8];               /* register value */
 205         u8 in_max[8];           /* register value */
 206         u8 in_min[8];           /* register value */
 207         u16 in_scale[8];
 208
 209         s8 temp[3];             /* register value */
 210         s8 temp_high[3];        /* register value */
 211         s8 temp_low[3];         /* register value */
 212         s8 temp_crit_int;       /* min of two register values */
 213         s8 temp_crit_ext;       /* min of two register values */
 214
 215         u8 fan[2];              /* register value */
 216         u8 fan_min[2];          /* register value */
 217         u8 fan_div[2];          /* register value, shifted right */
 218         u8 aout;                /* register value */
 219
 220         u16 alarms;             /* register values, combined */
 221         u8 vid;                 /* register values, combined */
 222         u8 vrm;
 223 };
 224
 225 /*
 226  * Sysfs stuff
 227  */
 228
 229 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 230 {
 231         return i2c_smbus_read_byte_data(client, reg);
 232 }
 233
 234 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 235 {
 236         return i2c_smbus_write_byte_data(client, reg, value);
 237 }
 238
 239 #define show_in(offset) \
 240 static ssize_t show_in##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 241 { \
 242         struct lm87_data *data = lm87_update_device(dev); \
 243         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
 244                        data->in_scale[offset])); \
 245 } \
 246 static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 247 { \
 248         struct lm87_data *data = lm87_update_device(dev); \
 249         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
 250                        data->in_scale[offset])); \
 251 } \
 252 static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
 253 { \
 254         struct lm87_data *data = lm87_update_device(dev); \
 255         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
 256                        data->in_scale[offset])); \
 257 } \
 258 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 259                 show_in##offset##_input, NULL);
 260 show_in(0);
 261 show_in(1);
 262 show_in(2);
 263 show_in(3);
 264 show_in(4);
 265 show_in(5);
 266 show_in(6);
 267 show_in(7);
 268
 269 static void set_in_min(struct device *dev, const char *buf, int nr)
 270 {
 271         struct i2c_client *client = to_i2c_client(dev);
 272         struct lm87_data *data = i2c_get_clientdata(client);
 273         long val = simple_strtol(buf, NULL, 10);
 274
 275         mutex_lock(&data->update_lock);
 276         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
 277         lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
 278                          LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
 279         mutex_unlock(&data->update_lock);
 280 }
 281
 282 static void set_in_max(struct device *dev, const char *buf, int nr)
 283 {
 284         struct i2c_client *client = to_i2c_client(dev);
 285         struct lm87_data *data = i2c_get_clientdata(client);
 286         long val = simple_strtol(buf, NULL, 10);
 287
 288         mutex_lock(&data->update_lock);
 289         data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
 290         lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
 291                          LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
 292         mutex_unlock(&data->update_lock);
 293 }
 294
 295 #define set_in(offset) \
 296 static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, \
 297                 const char *buf, size_t count) \
 298 { \
 299         set_in_min(dev, buf, offset); \
 300         return count; \
 301 } \
 302 static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, \
 303                 const char *buf, size_t count) \
 304 { \
 305         set_in_max(dev, buf, offset); \
 306         return count; \
 307 } \
 308 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
 309                 show_in##offset##_min, set_in##offset##_min); \
 310 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
 311                 show_in##offset##_max, set_in##offset##_max);
 312 set_in(0);
 313 set_in(1);
 314 set_in(2);
 315 set_in(3);
 316 set_in(4);
 317 set_in(5);
 318 set_in(6);
 319 set_in(7);
 320
 321 #define show_temp(offset) \
 322 static ssize_t show_temp##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 323 { \
 324         struct lm87_data *data = lm87_update_device(dev); \
 325         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
 326 } \
 327 static ssize_t show_temp##offset##_low(struct device *dev, struct device_attribute *attr, char *buf) \
 328 { \
 329         struct lm87_data *data = lm87_update_device(dev); \
 330         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
 331 } \
 332 static ssize_t show_temp##offset##_high(struct device *dev, struct device_attribute *attr, char *buf) \
 333 { \
 334         struct lm87_data *data = lm87_update_device(dev); \
 335         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
 336 }\
 337 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 338                 show_temp##offset##_input, NULL);
 339 show_temp(1);
 340 show_temp(2);
 341 show_temp(3);
 342
 343 static void set_temp_low(struct device *dev, const char *buf, int nr)
 344 {
 345         struct i2c_client *client = to_i2c_client(dev);
 346         struct lm87_data *data = i2c_get_clientdata(client);
 347         long val = simple_strtol(buf, NULL, 10);
 348
 349         mutex_lock(&data->update_lock);
 350         data->temp_low[nr] = TEMP_TO_REG(val);
 351         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
 352         mutex_unlock(&data->update_lock);
 353 }
 354
 355 static void set_temp_high(struct device *dev, const char *buf, int nr)
 356 {
 357         struct i2c_client *client = to_i2c_client(dev);
 358         struct lm87_data *data = i2c_get_clientdata(client);
 359         long val = simple_strtol(buf, NULL, 10);
 360
 361         mutex_lock(&data->update_lock);
 362         data->temp_high[nr] = TEMP_TO_REG(val);
 363         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
 364         mutex_unlock(&data->update_lock);
 365 }
 366
 367 #define set_temp(offset) \
 368 static ssize_t set_temp##offset##_low(struct device *dev, struct device_attribute *attr, \
 369                 const char *buf, size_t count) \
 370 { \
 371         set_temp_low(dev, buf, offset-1); \
 372         return count; \
 373 } \
 374 static ssize_t set_temp##offset##_high(struct device *dev, struct device_attribute *attr, \
 375                 const char *buf, size_t count) \
 376 { \
 377         set_temp_high(dev, buf, offset-1); \
 378         return count; \
 379 } \
 380 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
 381                 show_temp##offset##_high, set_temp##offset##_high); \
 382 static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
 383                 show_temp##offset##_low, set_temp##offset##_low);
 384 set_temp(1);
 385 set_temp(2);
 386 set_temp(3);
 387
 388 static ssize_t show_temp_crit_int(struct device *dev, struct device_attribute *attr, char *buf)
 389 {
 390         struct lm87_data *data = lm87_update_device(dev);
 391         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
 392 }
 393
 394 static ssize_t show_temp_crit_ext(struct device *dev, struct device_attribute *attr, char *buf)
 395 {
 396         struct lm87_data *data = lm87_update_device(dev);
 397         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
 398 }
 399
 400 static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
 401 static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
 402 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
 403
 404 #define show_fan(offset) \
 405 static ssize_t show_fan##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 406 { \
 407         struct lm87_data *data = lm87_update_device(dev); \
 408         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \
 409                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 410 } \
 411 static ssize_t show_fan##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 412 { \
 413         struct lm87_data *data = lm87_update_device(dev); \
 414         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \
 415                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 416 } \
 417 static ssize_t show_fan##offset##_div(struct device *dev, struct device_attribute *attr, char *buf) \
 418 { \
 419         struct lm87_data *data = lm87_update_device(dev); \
 420         return sprintf(buf, "%d\n", FAN_DIV_FROM_REG(data->fan_div[offset-1])); \
 421 } \
 422 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
 423                 show_fan##offset##_input, NULL);
 424 show_fan(1);
 425 show_fan(2);
 426
 427 static void set_fan_min(struct device *dev, const char *buf, 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
 433         mutex_lock(&data->update_lock);
 434         data->fan_min[nr] = FAN_TO_REG(val,
 435                             FAN_DIV_FROM_REG(data->fan_div[nr]));
 436         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
 437         mutex_unlock(&data->update_lock);
 438 }
 439
 440 /* Note: we save and restore the fan minimum here, because its value is
 441    determined in part by the fan clock divider.  This follows the principle
 442    of least surprise; the user doesn't expect the fan minimum to change just
 443    because the divider changed. */
 444 static ssize_t set_fan_div(struct device *dev, const char *buf,
 445                 size_t count, int nr)
 446 {
 447         struct i2c_client *client = to_i2c_client(dev);
 448         struct lm87_data *data = i2c_get_clientdata(client);
 449         long val = simple_strtol(buf, NULL, 10);
 450         unsigned long min;
 451         u8 reg;
 452
 453         mutex_lock(&data->update_lock);
 454         min = FAN_FROM_REG(data->fan_min[nr],
 455                            FAN_DIV_FROM_REG(data->fan_div[nr]));
 456
 457         switch (val) {
 458         case 1: data->fan_div[nr] = 0; break;
 459         case 2: data->fan_div[nr] = 1; break;
 460         case 4: data->fan_div[nr] = 2; break;
 461         case 8: data->fan_div[nr] = 3; break;
 462         default:
 463                 mutex_unlock(&data->update_lock);
 464                 return -EINVAL;
 465         }
 466
 467         reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 468         switch (nr) {
 469         case 0:
 470             reg = (reg & 0xCF) | (data->fan_div[0] << 4);
 471             break;
 472         case 1:
 473             reg = (reg & 0x3F) | (data->fan_div[1] << 6);
 474             break;
 475         }
 476         lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
 477
 478         data->fan_min[nr] = FAN_TO_REG(min, val);
 479         lm87_write_value(client, LM87_REG_FAN_MIN(nr),
 480                          data->fan_min[nr]);
 481         mutex_unlock(&data->update_lock);
 482
 483         return count;
 484 }
 485
 486 #define set_fan(offset) \
 487 static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
 488                 size_t count) \
 489 { \
 490         set_fan_min(dev, buf, offset-1); \
 491         return count; \
 492 } \
 493 static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \
 494                 size_t count) \
 495 { \
 496         return set_fan_div(dev, buf, count, offset-1); \
 497 } \
 498 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 499                 show_fan##offset##_min, set_fan##offset##_min); \
 500 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 501                 show_fan##offset##_div, set_fan##offset##_div);
 502 set_fan(1);
 503 set_fan(2);
 504
 505 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 506 {
 507         struct lm87_data *data = lm87_update_device(dev);
 508         return sprintf(buf, "%d\n", data->alarms);
 509 }
 510 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 511
 512 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 513 {
 514         struct lm87_data *data = lm87_update_device(dev);
 515         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 516 }
 517 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 518
 519 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 520 {
 521         struct lm87_data *data = dev_get_drvdata(dev);
 522         return sprintf(buf, "%d\n", data->vrm);
 523 }
 524 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 525 {
 526         struct lm87_data *data = dev_get_drvdata(dev);
 527         data->vrm = simple_strtoul(buf, NULL, 10);
 528         return count;
 529 }
 530 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 531
 532 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
 533 {
 534         struct lm87_data *data = lm87_update_device(dev);
 535         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 536 }
 537 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 538 {
 539         struct i2c_client *client = to_i2c_client(dev);
 540         struct lm87_data *data = i2c_get_clientdata(client);
 541         long val = simple_strtol(buf, NULL, 10);
 542
 543         mutex_lock(&data->update_lock);
 544         data->aout = AOUT_TO_REG(val);
 545         lm87_write_value(client, LM87_REG_AOUT, data->aout);
 546         mutex_unlock(&data->update_lock);
 547         return count;
 548 }
 549 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 550
 551 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 552                           char *buf)
 553 {
 554         struct lm87_data *data = lm87_update_device(dev);
 555         int bitnr = to_sensor_dev_attr(attr)->index;
 556         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 557 }
 558 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 559 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 560 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 561 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 562 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 563 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 564 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
 565 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
 566 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 567 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 568 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
 569 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 570 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 571 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
 572 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
 573
 574 /*
 575  * Real code
 576  */
 577
 578 static struct attribute *lm87_attributes[] = {
 579         &dev_attr_in1_input.attr,
 580         &dev_attr_in1_min.attr,
 581         &dev_attr_in1_max.attr,
 582         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 583         &dev_attr_in2_input.attr,
 584         &dev_attr_in2_min.attr,
 585         &dev_attr_in2_max.attr,
 586         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 587         &dev_attr_in3_input.attr,
 588         &dev_attr_in3_min.attr,
 589         &dev_attr_in3_max.attr,
 590         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 591         &dev_attr_in4_input.attr,
 592         &dev_attr_in4_min.attr,
 593         &dev_attr_in4_max.attr,
 594         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 595
 596         &dev_attr_temp1_input.attr,
 597         &dev_attr_temp1_max.attr,
 598         &dev_attr_temp1_min.attr,
 599         &dev_attr_temp1_crit.attr,
 600         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 601         &dev_attr_temp2_input.attr,
 602         &dev_attr_temp2_max.attr,
 603         &dev_attr_temp2_min.attr,
 604         &dev_attr_temp2_crit.attr,
 605         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 606         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 607
 608         &dev_attr_alarms.attr,
 609         &dev_attr_aout_output.attr,
 610
 611         NULL
 612 };
 613
 614 static const struct attribute_group lm87_group = {
 615         .attrs = lm87_attributes,
 616 };
 617
 618 static struct attribute *lm87_attributes_opt[] = {
 619         &dev_attr_in6_input.attr,
 620         &dev_attr_in6_min.attr,
 621         &dev_attr_in6_max.attr,
 622         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 623
 624         &dev_attr_fan1_input.attr,
 625         &dev_attr_fan1_min.attr,
 626         &dev_attr_fan1_div.attr,
 627         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 628
 629         &dev_attr_in7_input.attr,
 630         &dev_attr_in7_min.attr,
 631         &dev_attr_in7_max.attr,
 632         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 633
 634         &dev_attr_fan2_input.attr,
 635         &dev_attr_fan2_min.attr,
 636         &dev_attr_fan2_div.attr,
 637         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 638
 639         &dev_attr_temp3_input.attr,
 640         &dev_attr_temp3_max.attr,
 641         &dev_attr_temp3_min.attr,
 642         &dev_attr_temp3_crit.attr,
 643         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 644         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 645
 646         &dev_attr_in0_input.attr,
 647         &dev_attr_in0_min.attr,
 648         &dev_attr_in0_max.attr,
 649         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 650         &dev_attr_in5_input.attr,
 651         &dev_attr_in5_min.attr,
 652         &dev_attr_in5_max.attr,
 653         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 654
 655         &dev_attr_cpu0_vid.attr,
 656         &dev_attr_vrm.attr,
 657
 658         NULL
 659 };
 660
 661 static const struct attribute_group lm87_group_opt = {
 662         .attrs = lm87_attributes_opt,
 663 };
 664
 665 /* Return 0 if detection is successful, -ENODEV otherwise */
 666 static int lm87_detect(struct i2c_client *new_client, int kind,
 667                        struct i2c_board_info *info)
 668 {
 669         struct i2c_adapter *adapter = new_client->adapter;
 670         static const char *names[] = { "lm87", "adm1024" };
 671
 672         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 673                 return -ENODEV;
 674
 675         /* Default to an LM87 if forced */
 676         if (kind == 0)
 677                 kind = lm87;
 678
 679         /* Now, we do the remaining detection. */
 680         if (kind < 0) {
 681                 u8 cid = lm87_read_value(new_client, LM87_REG_COMPANY_ID);
 682                 u8 rev = lm87_read_value(new_client, LM87_REG_REVISION);
 683
 684                 if (cid == 0x02                 /* National Semiconductor */
 685                  && (rev >= 0x01 && rev <= 0x08))
 686                         kind = lm87;
 687                 else if (cid == 0x41            /* Analog Devices */
 688                       && (rev & 0xf0) == 0x10)
 689                         kind = adm1024;
 690
 691                 if (kind < 0
 692                  || (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)) {
 693                         dev_dbg(&adapter->dev,
 694                                 "LM87 detection failed at 0x%02x.\n",
 695                                 new_client->addr);
 696                         return -ENODEV;
 697                 }
 698         }
 699
 700         strlcpy(info->type, names[kind - 1], I2C_NAME_SIZE);
 701
 702         return 0;
 703 }
 704
 705 static int lm87_probe(struct i2c_client *new_client,
 706                       const struct i2c_device_id *id)
 707 {
 708         struct lm87_data *data;
 709         int err;
 710
 711         data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL);
 712         if (!data) {
 713                 err = -ENOMEM;
 714                 goto exit;
 715         }
 716
 717         i2c_set_clientdata(new_client, data);
 718         data->valid = 0;
 719         mutex_init(&data->update_lock);
 720
 721         /* Initialize the LM87 chip */
 722         lm87_init_client(new_client);
 723
 724         data->in_scale[0] = 2500;
 725         data->in_scale[1] = 2700;
 726         data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
 727         data->in_scale[3] = 5000;
 728         data->in_scale[4] = 12000;
 729         data->in_scale[5] = 2700;
 730         data->in_scale[6] = 1875;
 731         data->in_scale[7] = 1875;
 732
 733         /* Register sysfs hooks */
 734         if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group)))
 735                 goto exit_free;
 736
 737         if (data->channel & CHAN_NO_FAN(0)) {
 738                 if ((err = device_create_file(&new_client->dev,
 739                                         &dev_attr_in6_input))
 740                  || (err = device_create_file(&new_client->dev,
 741                                         &dev_attr_in6_min))
 742                  || (err = device_create_file(&new_client->dev,
 743                                         &dev_attr_in6_max))
 744                  || (err = device_create_file(&new_client->dev,
 745                                         &sensor_dev_attr_in6_alarm.dev_attr)))
 746                         goto exit_remove;
 747         } else {
 748                 if ((err = device_create_file(&new_client->dev,
 749                                         &dev_attr_fan1_input))
 750                  || (err = device_create_file(&new_client->dev,
 751                                         &dev_attr_fan1_min))
 752                  || (err = device_create_file(&new_client->dev,
 753                                         &dev_attr_fan1_div))
 754                  || (err = device_create_file(&new_client->dev,
 755                                         &sensor_dev_attr_fan1_alarm.dev_attr)))
 756                         goto exit_remove;
 757         }
 758
 759         if (data->channel & CHAN_NO_FAN(1)) {
 760                 if ((err = device_create_file(&new_client->dev,
 761                                         &dev_attr_in7_input))
 762                  || (err = device_create_file(&new_client->dev,
 763                                         &dev_attr_in7_min))
 764                  || (err = device_create_file(&new_client->dev,
 765                                         &dev_attr_in7_max))
 766                  || (err = device_create_file(&new_client->dev,
 767                                         &sensor_dev_attr_in7_alarm.dev_attr)))
 768                         goto exit_remove;
 769         } else {
 770                 if ((err = device_create_file(&new_client->dev,
 771                                         &dev_attr_fan2_input))
 772                  || (err = device_create_file(&new_client->dev,
 773                                         &dev_attr_fan2_min))
 774                  || (err = device_create_file(&new_client->dev,
 775                                         &dev_attr_fan2_div))
 776                  || (err = device_create_file(&new_client->dev,
 777                                         &sensor_dev_attr_fan2_alarm.dev_attr)))
 778                         goto exit_remove;
 779         }
 780
 781         if (data->channel & CHAN_TEMP3) {
 782                 if ((err = device_create_file(&new_client->dev,
 783                                         &dev_attr_temp3_input))
 784                  || (err = device_create_file(&new_client->dev,
 785                                         &dev_attr_temp3_max))
 786                  || (err = device_create_file(&new_client->dev,
 787                                         &dev_attr_temp3_min))
 788                  || (err = device_create_file(&new_client->dev,
 789                                         &dev_attr_temp3_crit))
 790                  || (err = device_create_file(&new_client->dev,
 791                                         &sensor_dev_attr_temp3_alarm.dev_attr))
 792                  || (err = device_create_file(&new_client->dev,
 793                                         &sensor_dev_attr_temp3_fault.dev_attr)))
 794                         goto exit_remove;
 795         } else {
 796                 if ((err = device_create_file(&new_client->dev,
 797                                         &dev_attr_in0_input))
 798                  || (err = device_create_file(&new_client->dev,
 799                                         &dev_attr_in0_min))
 800                  || (err = device_create_file(&new_client->dev,
 801                                         &dev_attr_in0_max))
 802                  || (err = device_create_file(&new_client->dev,
 803                                         &sensor_dev_attr_in0_alarm.dev_attr))
 804                  || (err = device_create_file(&new_client->dev,
 805                                         &dev_attr_in5_input))
 806                  || (err = device_create_file(&new_client->dev,
 807                                         &dev_attr_in5_min))
 808                  || (err = device_create_file(&new_client->dev,
 809                                         &dev_attr_in5_max))
 810                  || (err = device_create_file(&new_client->dev,
 811                                         &sensor_dev_attr_in5_alarm.dev_attr)))
 812                         goto exit_remove;
 813         }
 814
 815         if (!(data->channel & CHAN_NO_VID)) {
 816                 data->vrm = vid_which_vrm();
 817                 if ((err = device_create_file(&new_client->dev,
 818                                         &dev_attr_cpu0_vid))
 819                  || (err = device_create_file(&new_client->dev,
 820                                         &dev_attr_vrm)))
 821                         goto exit_remove;
 822         }
 823
 824         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 825         if (IS_ERR(data->hwmon_dev)) {
 826                 err = PTR_ERR(data->hwmon_dev);
 827                 goto exit_remove;
 828         }
 829
 830         return 0;
 831
 832 exit_remove:
 833         sysfs_remove_group(&new_client->dev.kobj, &lm87_group);
 834         sysfs_remove_group(&new_client->dev.kobj, &lm87_group_opt);
 835 exit_free:
 836         lm87_write_value(new_client, LM87_REG_CONFIG, data->config);
 837         kfree(data);
 838 exit:
 839         return err;
 840 }
 841
 842 static void lm87_init_client(struct i2c_client *client)
 843 {
 844         struct lm87_data *data = i2c_get_clientdata(client);
 845
 846         data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
 847         data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
 848
 849         if (!(data->config & 0x01)) {
 850                 int i;
 851
 852                 /* Limits are left uninitialized after power-up */
 853                 for (i = 1; i < 6; i++) {
 854                         lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
 855                         lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
 856                 }
 857                 for (i = 0; i < 2; i++) {
 858                         lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
 859                         lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
 860                         lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
 861                         lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
 862                 }
 863                 if (data->channel & CHAN_TEMP3) {
 864                         lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
 865                         lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
 866                 } else {
 867                         lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
 868                         lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
 869                 }
 870         }
 871
 872         /* Make sure Start is set and INT#_Clear is clear */
 873         if ((data->config & 0x09) != 0x01)
 874                 lm87_write_value(client, LM87_REG_CONFIG,
 875                                  (data->config & 0x77) | 0x01);
 876 }
 877
 878 static int lm87_remove(struct i2c_client *client)
 879 {
 880         struct lm87_data *data = i2c_get_clientdata(client);
 881
 882         hwmon_device_unregister(data->hwmon_dev);
 883         sysfs_remove_group(&client->dev.kobj, &lm87_group);
 884         sysfs_remove_group(&client->dev.kobj, &lm87_group_opt);
 885
 886         lm87_write_value(client, LM87_REG_CONFIG, data->config);
 887         kfree(data);
 888         return 0;
 889 }
 890
 891 static struct lm87_data *lm87_update_device(struct device *dev)
 892 {
 893         struct i2c_client *client = to_i2c_client(dev);
 894         struct lm87_data *data = i2c_get_clientdata(client);
 895
 896         mutex_lock(&data->update_lock);
 897
 898         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 899                 int i, j;
 900
 901                 dev_dbg(&client->dev, "Updating data.\n");
 902
 903                 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
 904                 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
 905                 for (; i < j; i++) {
 906                         data->in[i] = lm87_read_value(client,
 907                                       LM87_REG_IN(i));
 908                         data->in_min[i] = lm87_read_value(client,
 909                                           LM87_REG_IN_MIN(i));
 910                         data->in_max[i] = lm87_read_value(client,
 911                                           LM87_REG_IN_MAX(i));
 912                 }
 913
 914                 for (i = 0; i < 2; i++) {
 915                         if (data->channel & CHAN_NO_FAN(i)) {
 916                                 data->in[6+i] = lm87_read_value(client,
 917                                                 LM87_REG_AIN(i));
 918                                 data->in_max[6+i] = lm87_read_value(client,
 919                                                     LM87_REG_AIN_MAX(i));
 920                                 data->in_min[6+i] = lm87_read_value(client,
 921                                                     LM87_REG_AIN_MIN(i));
 922
 923                         } else {
 924                                 data->fan[i] = lm87_read_value(client,
 925                                                LM87_REG_FAN(i));
 926                                 data->fan_min[i] = lm87_read_value(client,
 927                                                    LM87_REG_FAN_MIN(i));
 928                         }
 929                 }
 930
 931                 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
 932                 for (i = 0 ; i < j; i++) {
 933                         data->temp[i] = lm87_read_value(client,
 934                                         LM87_REG_TEMP[i]);
 935                         data->temp_high[i] = lm87_read_value(client,
 936                                              LM87_REG_TEMP_HIGH[i]);
 937                         data->temp_low[i] = lm87_read_value(client,
 938                                             LM87_REG_TEMP_LOW[i]);
 939                 }
 940
 941                 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
 942                 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
 943                 data->temp_crit_int = min(i, j);
 944
 945                 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
 946                 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
 947                 data->temp_crit_ext = min(i, j);
 948
 949                 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 950                 data->fan_div[0] = (i >> 4) & 0x03;
 951                 data->fan_div[1] = (i >> 6) & 0x03;
 952                 data->vid = (i & 0x0F)
 953                           | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
 954                              << 4;
 955
 956                 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
 957                              | (lm87_read_value(client, LM87_REG_ALARMS2)
 958                                 << 8);
 959                 data->aout = lm87_read_value(client, LM87_REG_AOUT);
 960
 961                 data->last_updated = jiffies;
 962                 data->valid = 1;
 963         }
 964
 965         mutex_unlock(&data->update_lock);
 966
 967         return data;
 968 }
 969
 970 static int __init sensors_lm87_init(void)
 971 {
 972         return i2c_add_driver(&lm87_driver);
 973 }
 974
 975 static void __exit sensors_lm87_exit(void)
 976 {
 977         i2c_del_driver(&lm87_driver);
 978 }
 979
 980 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others");
 981 MODULE_DESCRIPTION("LM87 driver");
 982 MODULE_LICENSE("GPL");
 983
 984 module_init(sensors_lm87_init);
 985 module_exit(sensors_lm87_exit);