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 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
  70 /*
  71  * Addresses to scan
  72  * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
  73  */
  74
  75 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  76
  77 /*
  78  * Insmod parameters
  79  */
  80
  81 I2C_CLIENT_INSMOD_2(lm87, adm1024);
  82
  83 /*
  84  * The LM87 registers
  85  */
  86
  87 /* nr in 0..5 */
  88 #define LM87_REG_IN(nr)                 (0x20 + (nr))
  89 #define LM87_REG_IN_MAX(nr)             (0x2B + (nr) * 2)
  90 #define LM87_REG_IN_MIN(nr)             (0x2C + (nr) * 2)
  91 /* nr in 0..1 */
  92 #define LM87_REG_AIN(nr)                (0x28 + (nr))
  93 #define LM87_REG_AIN_MIN(nr)            (0x1A + (nr))
  94 #define LM87_REG_AIN_MAX(nr)            (0x3B + (nr))
  95
  96 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  97 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  98 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  99
 100 #define LM87_REG_TEMP_HW_INT_LOCK       0x13
 101 #define LM87_REG_TEMP_HW_EXT_LOCK       0x14
 102 #define LM87_REG_TEMP_HW_INT            0x17
 103 #define LM87_REG_TEMP_HW_EXT            0x18
 104
 105 /* nr in 0..1 */
 106 #define LM87_REG_FAN(nr)                (0x28 + (nr))
 107 #define LM87_REG_FAN_MIN(nr)            (0x3B + (nr))
 108 #define LM87_REG_AOUT                   0x19
 109
 110 #define LM87_REG_CONFIG                 0x40
 111 #define LM87_REG_CHANNEL_MODE           0x16
 112 #define LM87_REG_VID_FAN_DIV            0x47
 113 #define LM87_REG_VID4                   0x49
 114
 115 #define LM87_REG_ALARMS1                0x41
 116 #define LM87_REG_ALARMS2                0x42
 117
 118 #define LM87_REG_COMPANY_ID             0x3E
 119 #define LM87_REG_REVISION               0x3F
 120
 121 /*
 122  * Conversions and various macros
 123  * The LM87 uses signed 8-bit values for temperatures.
 124  */
 125
 126 #define IN_FROM_REG(reg,scale)  (((reg) * (scale) + 96) / 192)
 127 #define IN_TO_REG(val,scale)    ((val) <= 0 ? 0 : \
 128                                  (val) * 192 >= (scale) * 255 ? 255 : \
 129                                  ((val) * 192 + (scale)/2) / (scale))
 130
 131 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
 132 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 133                                  (val) >= 126500 ? 127 : \
 134                                  (((val) < 0 ? (val)-500 : (val)+500) / 1000))
 135
 136 #define FAN_FROM_REG(reg,div)   ((reg) == 255 || (reg) == 0 ? 0 : \
 137                                  (1350000 + (reg)*(div) / 2) / ((reg)*(div)))
 138 #define FAN_TO_REG(val,div)     ((val)*(div) * 255 <= 1350000 ? 255 : \
 139                                  (1350000 + (val)*(div) / 2) / ((val)*(div)))
 140
 141 #define FAN_DIV_FROM_REG(reg)   (1 << (reg))
 142
 143 /* analog out is 9.80mV/LSB */
 144 #define AOUT_FROM_REG(reg)      (((reg) * 98 + 5) / 10)
 145 #define AOUT_TO_REG(val)        ((val) <= 0 ? 0 : \
 146                                  (val) >= 2500 ? 255 : \
 147                                  ((val) * 10 + 49) / 98)
 148
 149 /* nr in 0..1 */
 150 #define CHAN_NO_FAN(nr)         (1 << (nr))
 151 #define CHAN_TEMP3              (1 << 2)
 152 #define CHAN_VCC_5V             (1 << 3)
 153 #define CHAN_NO_VID             (1 << 7)
 154
 155 /*
 156  * Functions declaration
 157  */
 158
 159 static int lm87_probe(struct i2c_client *client,
 160                       const struct i2c_device_id *id);
 161 static int lm87_detect(struct i2c_client *new_client, int kind,
 162                        struct i2c_board_info *info);
 163 static void lm87_init_client(struct i2c_client *client);
 164 static int lm87_remove(struct i2c_client *client);
 165 static struct lm87_data *lm87_update_device(struct device *dev);
 166
 167 /*
 168  * Driver data (common to all clients)
 169  */
 170
 171 static const struct i2c_device_id lm87_id[] = {
 172         { "lm87", lm87 },
 173         { "adm1024", adm1024 },
 174         { }
 175 };
 176 MODULE_DEVICE_TABLE(i2c, lm87_id);
 177
 178 static struct i2c_driver lm87_driver = {
 179         .class          = I2C_CLASS_HWMON,
 180         .driver = {
 181                 .name   = "lm87",
 182         },
 183         .probe          = lm87_probe,
 184         .remove         = lm87_remove,
 185         .id_table       = lm87_id,
 186         .detect         = lm87_detect,
 187         .address_data   = &addr_data,
 188 };
 189
 190 /*
 191  * Client data (each client gets its own)
 192  */
 193
 194 struct lm87_data {
 195         struct device *hwmon_dev;
 196         struct mutex update_lock;
 197         char valid; /* zero until following fields are valid */
 198         unsigned long last_updated; /* In jiffies */
 199
 200         u8 channel;             /* register value */
 201         u8 config;              /* original register value */
 202
 203         u8 in[8];               /* register value */
 204         u8 in_max[8];           /* register value */
 205         u8 in_min[8];           /* register value */
 206         u16 in_scale[8];
 207
 208         s8 temp[3];             /* register value */
 209         s8 temp_high[3];        /* register value */
 210         s8 temp_low[3];         /* register value */
 211         s8 temp_crit_int;       /* min of two register values */
 212         s8 temp_crit_ext;       /* min of two register values */
 213
 214         u8 fan[2];              /* register value */
 215         u8 fan_min[2];          /* register value */
 216         u8 fan_div[2];          /* register value, shifted right */
 217         u8 aout;                /* register value */
 218
 219         u16 alarms;             /* register values, combined */
 220         u8 vid;                 /* register values, combined */
 221         u8 vrm;
 222 };
 223
 224 /*
 225  * Sysfs stuff
 226  */
 227
 228 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 229 {
 230         return i2c_smbus_read_byte_data(client, reg);
 231 }
 232
 233 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 234 {
 235         return i2c_smbus_write_byte_data(client, reg, value);
 236 }
 237
 238 #define show_in(offset) \
 239 static ssize_t show_in##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 240 { \
 241         struct lm87_data *data = lm87_update_device(dev); \
 242         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
 243                        data->in_scale[offset])); \
 244 } \
 245 static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 246 { \
 247         struct lm87_data *data = lm87_update_device(dev); \
 248         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
 249                        data->in_scale[offset])); \
 250 } \
 251 static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
 252 { \
 253         struct lm87_data *data = lm87_update_device(dev); \
 254         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
 255                        data->in_scale[offset])); \
 256 } \
 257 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 258                 show_in##offset##_input, NULL);
 259 show_in(0);
 260 show_in(1);
 261 show_in(2);
 262 show_in(3);
 263 show_in(4);
 264 show_in(5);
 265 show_in(6);
 266 show_in(7);
 267
 268 static void set_in_min(struct device *dev, const char *buf, int nr)
 269 {
 270         struct i2c_client *client = to_i2c_client(dev);
 271         struct lm87_data *data = i2c_get_clientdata(client);
 272         long val = simple_strtol(buf, NULL, 10);
 273
 274         mutex_lock(&data->update_lock);
 275         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
 276         lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
 277                          LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
 278         mutex_unlock(&data->update_lock);
 279 }
 280
 281 static void set_in_max(struct device *dev, const char *buf, int nr)
 282 {
 283         struct i2c_client *client = to_i2c_client(dev);
 284         struct lm87_data *data = i2c_get_clientdata(client);
 285         long val = simple_strtol(buf, NULL, 10);
 286
 287         mutex_lock(&data->update_lock);
 288         data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
 289         lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
 290                          LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
 291         mutex_unlock(&data->update_lock);
 292 }
 293
 294 #define set_in(offset) \
 295 static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, \
 296                 const char *buf, size_t count) \
 297 { \
 298         set_in_min(dev, buf, offset); \
 299         return count; \
 300 } \
 301 static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, \
 302                 const char *buf, size_t count) \
 303 { \
 304         set_in_max(dev, buf, offset); \
 305         return count; \
 306 } \
 307 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
 308                 show_in##offset##_min, set_in##offset##_min); \
 309 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
 310                 show_in##offset##_max, set_in##offset##_max);
 311 set_in(0);
 312 set_in(1);
 313 set_in(2);
 314 set_in(3);
 315 set_in(4);
 316 set_in(5);
 317 set_in(6);
 318 set_in(7);
 319
 320 #define show_temp(offset) \
 321 static ssize_t show_temp##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 322 { \
 323         struct lm87_data *data = lm87_update_device(dev); \
 324         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
 325 } \
 326 static ssize_t show_temp##offset##_low(struct device *dev, struct device_attribute *attr, char *buf) \
 327 { \
 328         struct lm87_data *data = lm87_update_device(dev); \
 329         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
 330 } \
 331 static ssize_t show_temp##offset##_high(struct device *dev, struct device_attribute *attr, char *buf) \
 332 { \
 333         struct lm87_data *data = lm87_update_device(dev); \
 334         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
 335 }\
 336 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 337                 show_temp##offset##_input, NULL);
 338 show_temp(1);
 339 show_temp(2);
 340 show_temp(3);
 341
 342 static void set_temp_low(struct device *dev, const char *buf, int nr)
 343 {
 344         struct i2c_client *client = to_i2c_client(dev);
 345         struct lm87_data *data = i2c_get_clientdata(client);
 346         long val = simple_strtol(buf, NULL, 10);
 347
 348         mutex_lock(&data->update_lock);
 349         data->temp_low[nr] = TEMP_TO_REG(val);
 350         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
 351         mutex_unlock(&data->update_lock);
 352 }
 353
 354 static void set_temp_high(struct device *dev, const char *buf, int nr)
 355 {
 356         struct i2c_client *client = to_i2c_client(dev);
 357         struct lm87_data *data = i2c_get_clientdata(client);
 358         long val = simple_strtol(buf, NULL, 10);
 359
 360         mutex_lock(&data->update_lock);
 361         data->temp_high[nr] = TEMP_TO_REG(val);
 362         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
 363         mutex_unlock(&data->update_lock);
 364 }
 365
 366 #define set_temp(offset) \
 367 static ssize_t set_temp##offset##_low(struct device *dev, struct device_attribute *attr, \
 368                 const char *buf, size_t count) \
 369 { \
 370         set_temp_low(dev, buf, offset-1); \
 371         return count; \
 372 } \
 373 static ssize_t set_temp##offset##_high(struct device *dev, struct device_attribute *attr, \
 374                 const char *buf, size_t count) \
 375 { \
 376         set_temp_high(dev, buf, offset-1); \
 377         return count; \
 378 } \
 379 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
 380                 show_temp##offset##_high, set_temp##offset##_high); \
 381 static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
 382                 show_temp##offset##_low, set_temp##offset##_low);
 383 set_temp(1);
 384 set_temp(2);
 385 set_temp(3);
 386
 387 static ssize_t show_temp_crit_int(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", TEMP_FROM_REG(data->temp_crit_int));
 391 }
 392
 393 static ssize_t show_temp_crit_ext(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", TEMP_FROM_REG(data->temp_crit_ext));
 397 }
 398
 399 static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
 400 static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
 401 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
 402
 403 #define show_fan(offset) \
 404 static ssize_t show_fan##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 405 { \
 406         struct lm87_data *data = lm87_update_device(dev); \
 407         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \
 408                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 409 } \
 410 static ssize_t show_fan##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 411 { \
 412         struct lm87_data *data = lm87_update_device(dev); \
 413         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \
 414                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 415 } \
 416 static ssize_t show_fan##offset##_div(struct device *dev, struct device_attribute *attr, char *buf) \
 417 { \
 418         struct lm87_data *data = lm87_update_device(dev); \
 419         return sprintf(buf, "%d\n", FAN_DIV_FROM_REG(data->fan_div[offset-1])); \
 420 } \
 421 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
 422                 show_fan##offset##_input, NULL);
 423 show_fan(1);
 424 show_fan(2);
 425
 426 static void set_fan_min(struct device *dev, const char *buf, int nr)
 427 {
 428         struct i2c_client *client = to_i2c_client(dev);
 429         struct lm87_data *data = i2c_get_clientdata(client);
 430         long val = simple_strtol(buf, NULL, 10);
 431
 432         mutex_lock(&data->update_lock);
 433         data->fan_min[nr] = FAN_TO_REG(val,
 434                             FAN_DIV_FROM_REG(data->fan_div[nr]));
 435         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
 436         mutex_unlock(&data->update_lock);
 437 }
 438
 439 /* Note: we save and restore the fan minimum here, because its value is
 440    determined in part by the fan clock divider.  This follows the principle
 441    of least surprise; the user doesn't expect the fan minimum to change just
 442    because the divider changed. */
 443 static ssize_t set_fan_div(struct device *dev, const char *buf,
 444                 size_t count, int nr)
 445 {
 446         struct i2c_client *client = to_i2c_client(dev);
 447         struct lm87_data *data = i2c_get_clientdata(client);
 448         long val = simple_strtol(buf, NULL, 10);
 449         unsigned long min;
 450         u8 reg;
 451
 452         mutex_lock(&data->update_lock);
 453         min = FAN_FROM_REG(data->fan_min[nr],
 454                            FAN_DIV_FROM_REG(data->fan_div[nr]));
 455
 456         switch (val) {
 457         case 1: data->fan_div[nr] = 0; break;
 458         case 2: data->fan_div[nr] = 1; break;
 459         case 4: data->fan_div[nr] = 2; break;
 460         case 8: data->fan_div[nr] = 3; break;
 461         default:
 462                 mutex_unlock(&data->update_lock);
 463                 return -EINVAL;
 464         }
 465
 466         reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 467         switch (nr) {
 468         case 0:
 469             reg = (reg & 0xCF) | (data->fan_div[0] << 4);
 470             break;
 471         case 1:
 472             reg = (reg & 0x3F) | (data->fan_div[1] << 6);
 473             break;
 474         }
 475         lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
 476
 477         data->fan_min[nr] = FAN_TO_REG(min, val);
 478         lm87_write_value(client, LM87_REG_FAN_MIN(nr),
 479                          data->fan_min[nr]);
 480         mutex_unlock(&data->update_lock);
 481
 482         return count;
 483 }
 484
 485 #define set_fan(offset) \
 486 static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
 487                 size_t count) \
 488 { \
 489         set_fan_min(dev, buf, offset-1); \
 490         return count; \
 491 } \
 492 static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \
 493                 size_t count) \
 494 { \
 495         return set_fan_div(dev, buf, count, offset-1); \
 496 } \
 497 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 498                 show_fan##offset##_min, set_fan##offset##_min); \
 499 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 500                 show_fan##offset##_div, set_fan##offset##_div);
 501 set_fan(1);
 502 set_fan(2);
 503
 504 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 505 {
 506         struct lm87_data *data = lm87_update_device(dev);
 507         return sprintf(buf, "%d\n", data->alarms);
 508 }
 509 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 510
 511 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 512 {
 513         struct lm87_data *data = lm87_update_device(dev);
 514         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 515 }
 516 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 517
 518 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 519 {
 520         struct lm87_data *data = dev_get_drvdata(dev);
 521         return sprintf(buf, "%d\n", data->vrm);
 522 }
 523 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 524 {
 525         struct lm87_data *data = dev_get_drvdata(dev);
 526         data->vrm = simple_strtoul(buf, NULL, 10);
 527         return count;
 528 }
 529 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 530
 531 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
 532 {
 533         struct lm87_data *data = lm87_update_device(dev);
 534         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 535 }
 536 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 537 {
 538         struct i2c_client *client = to_i2c_client(dev);
 539         struct lm87_data *data = i2c_get_clientdata(client);
 540         long val = simple_strtol(buf, NULL, 10);
 541
 542         mutex_lock(&data->update_lock);
 543         data->aout = AOUT_TO_REG(val);
 544         lm87_write_value(client, LM87_REG_AOUT, data->aout);
 545         mutex_unlock(&data->update_lock);
 546         return count;
 547 }
 548 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 549
 550 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 551                           char *buf)
 552 {
 553         struct lm87_data *data = lm87_update_device(dev);
 554         int bitnr = to_sensor_dev_attr(attr)->index;
 555         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 556 }
 557 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 558 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 559 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 560 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 561 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 562 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 563 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
 564 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
 565 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 566 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 567 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
 568 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 569 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 570 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
 571 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
 572
 573 /*
 574  * Real code
 575  */
 576
 577 static struct attribute *lm87_attributes[] = {
 578         &dev_attr_in1_input.attr,
 579         &dev_attr_in1_min.attr,
 580         &dev_attr_in1_max.attr,
 581         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 582         &dev_attr_in2_input.attr,
 583         &dev_attr_in2_min.attr,
 584         &dev_attr_in2_max.attr,
 585         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 586         &dev_attr_in3_input.attr,
 587         &dev_attr_in3_min.attr,
 588         &dev_attr_in3_max.attr,
 589         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 590         &dev_attr_in4_input.attr,
 591         &dev_attr_in4_min.attr,
 592         &dev_attr_in4_max.attr,
 593         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 594
 595         &dev_attr_temp1_input.attr,
 596         &dev_attr_temp1_max.attr,
 597         &dev_attr_temp1_min.attr,
 598         &dev_attr_temp1_crit.attr,
 599         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 600         &dev_attr_temp2_input.attr,
 601         &dev_attr_temp2_max.attr,
 602         &dev_attr_temp2_min.attr,
 603         &dev_attr_temp2_crit.attr,
 604         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 605         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 606
 607         &dev_attr_alarms.attr,
 608         &dev_attr_aout_output.attr,
 609
 610         NULL
 611 };
 612
 613 static const struct attribute_group lm87_group = {
 614         .attrs = lm87_attributes,
 615 };
 616
 617 static struct attribute *lm87_attributes_opt[] = {
 618         &dev_attr_in6_input.attr,
 619         &dev_attr_in6_min.attr,
 620         &dev_attr_in6_max.attr,
 621         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 622
 623         &dev_attr_fan1_input.attr,
 624         &dev_attr_fan1_min.attr,
 625         &dev_attr_fan1_div.attr,
 626         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 627
 628         &dev_attr_in7_input.attr,
 629         &dev_attr_in7_min.attr,
 630         &dev_attr_in7_max.attr,
 631         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 632
 633         &dev_attr_fan2_input.attr,
 634         &dev_attr_fan2_min.attr,
 635         &dev_attr_fan2_div.attr,
 636         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 637
 638         &dev_attr_temp3_input.attr,
 639         &dev_attr_temp3_max.attr,
 640         &dev_attr_temp3_min.attr,
 641         &dev_attr_temp3_crit.attr,
 642         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 643         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 644
 645         &dev_attr_in0_input.attr,
 646         &dev_attr_in0_min.attr,
 647         &dev_attr_in0_max.attr,
 648         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 649         &dev_attr_in5_input.attr,
 650         &dev_attr_in5_min.attr,
 651         &dev_attr_in5_max.attr,
 652         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 653
 654         &dev_attr_cpu0_vid.attr,
 655         &dev_attr_vrm.attr,
 656
 657         NULL
 658 };
 659
 660 static const struct attribute_group lm87_group_opt = {
 661         .attrs = lm87_attributes_opt,
 662 };
 663
 664 /* Return 0 if detection is successful, -ENODEV otherwise */
 665 static int lm87_detect(struct i2c_client *new_client, int kind,
 666                        struct i2c_board_info *info)
 667 {
 668         struct i2c_adapter *adapter = new_client->adapter;
 669         const char *name;
 670         u8 cid, rev;
 671
 672         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 673                 return -ENODEV;
 674
 675         if (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)
 676                 return -ENODEV;
 677
 678         /* Now, we do the remaining detection. */
 679         cid = lm87_read_value(new_client, LM87_REG_COMPANY_ID);
 680         rev = lm87_read_value(new_client, LM87_REG_REVISION);
 681
 682         if (cid == 0x02                 /* National Semiconductor */
 683          && (rev >= 0x01 && rev <= 0x08))
 684                 name = "lm87";
 685         else if (cid == 0x41            /* Analog Devices */
 686               && (rev & 0xf0) == 0x10)
 687                 name = "adm1024";
 688         else {
 689                 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
 690                         new_client->addr);
 691                 return -ENODEV;
 692         }
 693
 694         strlcpy(info->type, name, I2C_NAME_SIZE);
 695
 696         return 0;
 697 }
 698
 699 static int lm87_probe(struct i2c_client *new_client,
 700                       const struct i2c_device_id *id)
 701 {
 702         struct lm87_data *data;
 703         int err;
 704
 705         data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL);
 706         if (!data) {
 707                 err = -ENOMEM;
 708                 goto exit;
 709         }
 710
 711         i2c_set_clientdata(new_client, data);
 712         data->valid = 0;
 713         mutex_init(&data->update_lock);
 714
 715         /* Initialize the LM87 chip */
 716         lm87_init_client(new_client);
 717
 718         data->in_scale[0] = 2500;
 719         data->in_scale[1] = 2700;
 720         data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
 721         data->in_scale[3] = 5000;
 722         data->in_scale[4] = 12000;
 723         data->in_scale[5] = 2700;
 724         data->in_scale[6] = 1875;
 725         data->in_scale[7] = 1875;
 726
 727         /* Register sysfs hooks */
 728         if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group)))
 729                 goto exit_free;
 730
 731         if (data->channel & CHAN_NO_FAN(0)) {
 732                 if ((err = device_create_file(&new_client->dev,
 733                                         &dev_attr_in6_input))
 734                  || (err = device_create_file(&new_client->dev,
 735                                         &dev_attr_in6_min))
 736                  || (err = device_create_file(&new_client->dev,
 737                                         &dev_attr_in6_max))
 738                  || (err = device_create_file(&new_client->dev,
 739                                         &sensor_dev_attr_in6_alarm.dev_attr)))
 740                         goto exit_remove;
 741         } else {
 742                 if ((err = device_create_file(&new_client->dev,
 743                                         &dev_attr_fan1_input))
 744                  || (err = device_create_file(&new_client->dev,
 745                                         &dev_attr_fan1_min))
 746                  || (err = device_create_file(&new_client->dev,
 747                                         &dev_attr_fan1_div))
 748                  || (err = device_create_file(&new_client->dev,
 749                                         &sensor_dev_attr_fan1_alarm.dev_attr)))
 750                         goto exit_remove;
 751         }
 752
 753         if (data->channel & CHAN_NO_FAN(1)) {
 754                 if ((err = device_create_file(&new_client->dev,
 755                                         &dev_attr_in7_input))
 756                  || (err = device_create_file(&new_client->dev,
 757                                         &dev_attr_in7_min))
 758                  || (err = device_create_file(&new_client->dev,
 759                                         &dev_attr_in7_max))
 760                  || (err = device_create_file(&new_client->dev,
 761                                         &sensor_dev_attr_in7_alarm.dev_attr)))
 762                         goto exit_remove;
 763         } else {
 764                 if ((err = device_create_file(&new_client->dev,
 765                                         &dev_attr_fan2_input))
 766                  || (err = device_create_file(&new_client->dev,
 767                                         &dev_attr_fan2_min))
 768                  || (err = device_create_file(&new_client->dev,
 769                                         &dev_attr_fan2_div))
 770                  || (err = device_create_file(&new_client->dev,
 771                                         &sensor_dev_attr_fan2_alarm.dev_attr)))
 772                         goto exit_remove;
 773         }
 774
 775         if (data->channel & CHAN_TEMP3) {
 776                 if ((err = device_create_file(&new_client->dev,
 777                                         &dev_attr_temp3_input))
 778                  || (err = device_create_file(&new_client->dev,
 779                                         &dev_attr_temp3_max))
 780                  || (err = device_create_file(&new_client->dev,
 781                                         &dev_attr_temp3_min))
 782                  || (err = device_create_file(&new_client->dev,
 783                                         &dev_attr_temp3_crit))
 784                  || (err = device_create_file(&new_client->dev,
 785                                         &sensor_dev_attr_temp3_alarm.dev_attr))
 786                  || (err = device_create_file(&new_client->dev,
 787                                         &sensor_dev_attr_temp3_fault.dev_attr)))
 788                         goto exit_remove;
 789         } else {
 790                 if ((err = device_create_file(&new_client->dev,
 791                                         &dev_attr_in0_input))
 792                  || (err = device_create_file(&new_client->dev,
 793                                         &dev_attr_in0_min))
 794                  || (err = device_create_file(&new_client->dev,
 795                                         &dev_attr_in0_max))
 796                  || (err = device_create_file(&new_client->dev,
 797                                         &sensor_dev_attr_in0_alarm.dev_attr))
 798                  || (err = device_create_file(&new_client->dev,
 799                                         &dev_attr_in5_input))
 800                  || (err = device_create_file(&new_client->dev,
 801                                         &dev_attr_in5_min))
 802                  || (err = device_create_file(&new_client->dev,
 803                                         &dev_attr_in5_max))
 804                  || (err = device_create_file(&new_client->dev,
 805                                         &sensor_dev_attr_in5_alarm.dev_attr)))
 806                         goto exit_remove;
 807         }
 808
 809         if (!(data->channel & CHAN_NO_VID)) {
 810                 data->vrm = vid_which_vrm();
 811                 if ((err = device_create_file(&new_client->dev,
 812                                         &dev_attr_cpu0_vid))
 813                  || (err = device_create_file(&new_client->dev,
 814                                         &dev_attr_vrm)))
 815                         goto exit_remove;
 816         }
 817
 818         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 819         if (IS_ERR(data->hwmon_dev)) {
 820                 err = PTR_ERR(data->hwmon_dev);
 821                 goto exit_remove;
 822         }
 823
 824         return 0;
 825
 826 exit_remove:
 827         sysfs_remove_group(&new_client->dev.kobj, &lm87_group);
 828         sysfs_remove_group(&new_client->dev.kobj, &lm87_group_opt);
 829 exit_free:
 830         lm87_write_value(new_client, LM87_REG_CONFIG, data->config);
 831         kfree(data);
 832 exit:
 833         return err;
 834 }
 835
 836 static void lm87_init_client(struct i2c_client *client)
 837 {
 838         struct lm87_data *data = i2c_get_clientdata(client);
 839
 840         if (client->dev.platform_data) {
 841                 data->channel = *(u8 *)client->dev.platform_data;
 842                 lm87_write_value(client,
 843                                  LM87_REG_CHANNEL_MODE, data->channel);
 844         } else {
 845                 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
 846         }
 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);