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) 2004,2007  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 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_attach_adapter(struct i2c_adapter *adapter);
 161 static int lm87_detect(struct i2c_adapter *adapter, int address, int kind);
 162 static void lm87_init_client(struct i2c_client *client);
 163 static int lm87_detach_client(struct i2c_client *client);
 164 static struct lm87_data *lm87_update_device(struct device *dev);
 165
 166 /*
 167  * Driver data (common to all clients)
 168  */
 169
 170 static struct i2c_driver lm87_driver = {
 171         .driver = {
 172                 .name   = "lm87",
 173         },
 174         .id             = I2C_DRIVERID_LM87,
 175         .attach_adapter = lm87_attach_adapter,
 176         .detach_client  = lm87_detach_client,
 177 };
 178
 179 /*
 180  * Client data (each client gets its own)
 181  */
 182
 183 struct lm87_data {
 184         struct i2c_client client;
 185         struct device *hwmon_dev;
 186         struct mutex update_lock;
 187         char valid; /* zero until following fields are valid */
 188         unsigned long last_updated; /* In jiffies */
 189
 190         u8 channel;             /* register value */
 191
 192         u8 in[8];               /* register value */
 193         u8 in_max[8];           /* register value */
 194         u8 in_min[8];           /* register value */
 195         u16 in_scale[8];
 196
 197         s8 temp[3];             /* register value */
 198         s8 temp_high[3];        /* register value */
 199         s8 temp_low[3];         /* register value */
 200         s8 temp_crit_int;       /* min of two register values */
 201         s8 temp_crit_ext;       /* min of two register values */
 202
 203         u8 fan[2];              /* register value */
 204         u8 fan_min[2];          /* register value */
 205         u8 fan_div[2];          /* register value, shifted right */
 206         u8 aout;                /* register value */
 207
 208         u16 alarms;             /* register values, combined */
 209         u8 vid;                 /* register values, combined */
 210         u8 vrm;
 211 };
 212
 213 /*
 214  * Sysfs stuff
 215  */
 216
 217 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 218 {
 219         return i2c_smbus_read_byte_data(client, reg);
 220 }
 221
 222 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 223 {
 224         return i2c_smbus_write_byte_data(client, reg, value);
 225 }
 226
 227 #define show_in(offset) \
 228 static ssize_t show_in##offset##_input(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[offset], \
 232                        data->in_scale[offset])); \
 233 } \
 234 static ssize_t show_in##offset##_min(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_min[offset], \
 238                        data->in_scale[offset])); \
 239 } \
 240 static ssize_t show_in##offset##_max(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_max[offset], \
 244                        data->in_scale[offset])); \
 245 } \
 246 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 247                 show_in##offset##_input, NULL);
 248 show_in(0);
 249 show_in(1);
 250 show_in(2);
 251 show_in(3);
 252 show_in(4);
 253 show_in(5);
 254 show_in(6);
 255 show_in(7);
 256
 257 static void set_in_min(struct device *dev, const char *buf, int nr)
 258 {
 259         struct i2c_client *client = to_i2c_client(dev);
 260         struct lm87_data *data = i2c_get_clientdata(client);
 261         long val = simple_strtol(buf, NULL, 10);
 262
 263         mutex_lock(&data->update_lock);
 264         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
 265         lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
 266                          LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
 267         mutex_unlock(&data->update_lock);
 268 }
 269
 270 static void set_in_max(struct device *dev, const char *buf, int nr)
 271 {
 272         struct i2c_client *client = to_i2c_client(dev);
 273         struct lm87_data *data = i2c_get_clientdata(client);
 274         long val = simple_strtol(buf, NULL, 10);
 275
 276         mutex_lock(&data->update_lock);
 277         data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
 278         lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
 279                          LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
 280         mutex_unlock(&data->update_lock);
 281 }
 282
 283 #define set_in(offset) \
 284 static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, \
 285                 const char *buf, size_t count) \
 286 { \
 287         set_in_min(dev, buf, offset); \
 288         return count; \
 289 } \
 290 static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, \
 291                 const char *buf, size_t count) \
 292 { \
 293         set_in_max(dev, buf, offset); \
 294         return count; \
 295 } \
 296 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
 297                 show_in##offset##_min, set_in##offset##_min); \
 298 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
 299                 show_in##offset##_max, set_in##offset##_max);
 300 set_in(0);
 301 set_in(1);
 302 set_in(2);
 303 set_in(3);
 304 set_in(4);
 305 set_in(5);
 306 set_in(6);
 307 set_in(7);
 308
 309 #define show_temp(offset) \
 310 static ssize_t show_temp##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 311 { \
 312         struct lm87_data *data = lm87_update_device(dev); \
 313         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
 314 } \
 315 static ssize_t show_temp##offset##_low(struct device *dev, struct device_attribute *attr, char *buf) \
 316 { \
 317         struct lm87_data *data = lm87_update_device(dev); \
 318         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
 319 } \
 320 static ssize_t show_temp##offset##_high(struct device *dev, struct device_attribute *attr, char *buf) \
 321 { \
 322         struct lm87_data *data = lm87_update_device(dev); \
 323         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
 324 }\
 325 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 326                 show_temp##offset##_input, NULL);
 327 show_temp(1);
 328 show_temp(2);
 329 show_temp(3);
 330
 331 static void set_temp_low(struct device *dev, const char *buf, int nr)
 332 {
 333         struct i2c_client *client = to_i2c_client(dev);
 334         struct lm87_data *data = i2c_get_clientdata(client);
 335         long val = simple_strtol(buf, NULL, 10);
 336
 337         mutex_lock(&data->update_lock);
 338         data->temp_low[nr] = TEMP_TO_REG(val);
 339         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
 340         mutex_unlock(&data->update_lock);
 341 }
 342
 343 static void set_temp_high(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_high[nr] = TEMP_TO_REG(val);
 351         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
 352         mutex_unlock(&data->update_lock);
 353 }
 354
 355 #define set_temp(offset) \
 356 static ssize_t set_temp##offset##_low(struct device *dev, struct device_attribute *attr, \
 357                 const char *buf, size_t count) \
 358 { \
 359         set_temp_low(dev, buf, offset-1); \
 360         return count; \
 361 } \
 362 static ssize_t set_temp##offset##_high(struct device *dev, struct device_attribute *attr, \
 363                 const char *buf, size_t count) \
 364 { \
 365         set_temp_high(dev, buf, offset-1); \
 366         return count; \
 367 } \
 368 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
 369                 show_temp##offset##_high, set_temp##offset##_high); \
 370 static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
 371                 show_temp##offset##_low, set_temp##offset##_low);
 372 set_temp(1);
 373 set_temp(2);
 374 set_temp(3);
 375
 376 static ssize_t show_temp_crit_int(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_int));
 380 }
 381
 382 static ssize_t show_temp_crit_ext(struct device *dev, struct device_attribute *attr, char *buf)
 383 {
 384         struct lm87_data *data = lm87_update_device(dev);
 385         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
 386 }
 387
 388 static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
 389 static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
 390 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
 391
 392 #define show_fan(offset) \
 393 static ssize_t show_fan##offset##_input(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[offset-1], \
 397                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 398 } \
 399 static ssize_t show_fan##offset##_min(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_FROM_REG(data->fan_min[offset-1], \
 403                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 404 } \
 405 static ssize_t show_fan##offset##_div(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_DIV_FROM_REG(data->fan_div[offset-1])); \
 409 } \
 410 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
 411                 show_fan##offset##_input, NULL);
 412 show_fan(1);
 413 show_fan(2);
 414
 415 static void set_fan_min(struct device *dev, const char *buf, int nr)
 416 {
 417         struct i2c_client *client = to_i2c_client(dev);
 418         struct lm87_data *data = i2c_get_clientdata(client);
 419         long val = simple_strtol(buf, NULL, 10);
 420
 421         mutex_lock(&data->update_lock);
 422         data->fan_min[nr] = FAN_TO_REG(val,
 423                             FAN_DIV_FROM_REG(data->fan_div[nr]));
 424         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
 425         mutex_unlock(&data->update_lock);
 426 }
 427
 428 /* Note: we save and restore the fan minimum here, because its value is
 429    determined in part by the fan clock divider.  This follows the principle
 430    of least surprise; the user doesn't expect the fan minimum to change just
 431    because the divider changed. */
 432 static ssize_t set_fan_div(struct device *dev, const char *buf,
 433                 size_t count, int nr)
 434 {
 435         struct i2c_client *client = to_i2c_client(dev);
 436         struct lm87_data *data = i2c_get_clientdata(client);
 437         long val = simple_strtol(buf, NULL, 10);
 438         unsigned long min;
 439         u8 reg;
 440
 441         mutex_lock(&data->update_lock);
 442         min = FAN_FROM_REG(data->fan_min[nr],
 443                            FAN_DIV_FROM_REG(data->fan_div[nr]));
 444
 445         switch (val) {
 446         case 1: data->fan_div[nr] = 0; break;
 447         case 2: data->fan_div[nr] = 1; break;
 448         case 4: data->fan_div[nr] = 2; break;
 449         case 8: data->fan_div[nr] = 3; break;
 450         default:
 451                 mutex_unlock(&data->update_lock);
 452                 return -EINVAL;
 453         }
 454
 455         reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 456         switch (nr) {
 457         case 0:
 458             reg = (reg & 0xCF) | (data->fan_div[0] << 4);
 459             break;
 460         case 1:
 461             reg = (reg & 0x3F) | (data->fan_div[1] << 6);
 462             break;
 463         }
 464         lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
 465
 466         data->fan_min[nr] = FAN_TO_REG(min, val);
 467         lm87_write_value(client, LM87_REG_FAN_MIN(nr),
 468                          data->fan_min[nr]);
 469         mutex_unlock(&data->update_lock);
 470
 471         return count;
 472 }
 473
 474 #define set_fan(offset) \
 475 static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
 476                 size_t count) \
 477 { \
 478         set_fan_min(dev, buf, offset-1); \
 479         return count; \
 480 } \
 481 static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \
 482                 size_t count) \
 483 { \
 484         return set_fan_div(dev, buf, count, offset-1); \
 485 } \
 486 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 487                 show_fan##offset##_min, set_fan##offset##_min); \
 488 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 489                 show_fan##offset##_div, set_fan##offset##_div);
 490 set_fan(1);
 491 set_fan(2);
 492
 493 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 494 {
 495         struct lm87_data *data = lm87_update_device(dev);
 496         return sprintf(buf, "%d\n", data->alarms);
 497 }
 498 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 499
 500 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 501 {
 502         struct lm87_data *data = lm87_update_device(dev);
 503         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 504 }
 505 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 506
 507 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 508 {
 509         struct lm87_data *data = dev_get_drvdata(dev);
 510         return sprintf(buf, "%d\n", data->vrm);
 511 }
 512 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 513 {
 514         struct i2c_client *client = to_i2c_client(dev);
 515         struct lm87_data *data = i2c_get_clientdata(client);
 516         data->vrm = simple_strtoul(buf, NULL, 10);
 517         return count;
 518 }
 519 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 520
 521 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
 522 {
 523         struct lm87_data *data = lm87_update_device(dev);
 524         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 525 }
 526 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 527 {
 528         struct i2c_client *client = to_i2c_client(dev);
 529         struct lm87_data *data = i2c_get_clientdata(client);
 530         long val = simple_strtol(buf, NULL, 10);
 531
 532         mutex_lock(&data->update_lock);
 533         data->aout = AOUT_TO_REG(val);
 534         lm87_write_value(client, LM87_REG_AOUT, data->aout);
 535         mutex_unlock(&data->update_lock);
 536         return count;
 537 }
 538 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 539
 540 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 541                           char *buf)
 542 {
 543         struct lm87_data *data = lm87_update_device(dev);
 544         int bitnr = to_sensor_dev_attr(attr)->index;
 545         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 546 }
 547 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 548 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 549 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 550 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 551 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 552 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 553 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
 554 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
 555 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 556 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 557 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
 558 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 559 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 560 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
 561 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
 562
 563 /*
 564  * Real code
 565  */
 566
 567 static int lm87_attach_adapter(struct i2c_adapter *adapter)
 568 {
 569         if (!(adapter->class & I2C_CLASS_HWMON))
 570                 return 0;
 571         return i2c_probe(adapter, &addr_data, lm87_detect);
 572 }
 573
 574 static struct attribute *lm87_attributes[] = {
 575         &dev_attr_in1_input.attr,
 576         &dev_attr_in1_min.attr,
 577         &dev_attr_in1_max.attr,
 578         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 579         &dev_attr_in2_input.attr,
 580         &dev_attr_in2_min.attr,
 581         &dev_attr_in2_max.attr,
 582         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 583         &dev_attr_in3_input.attr,
 584         &dev_attr_in3_min.attr,
 585         &dev_attr_in3_max.attr,
 586         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 587         &dev_attr_in4_input.attr,
 588         &dev_attr_in4_min.attr,
 589         &dev_attr_in4_max.attr,
 590         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 591
 592         &dev_attr_temp1_input.attr,
 593         &dev_attr_temp1_max.attr,
 594         &dev_attr_temp1_min.attr,
 595         &dev_attr_temp1_crit.attr,
 596         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 597         &dev_attr_temp2_input.attr,
 598         &dev_attr_temp2_max.attr,
 599         &dev_attr_temp2_min.attr,
 600         &dev_attr_temp2_crit.attr,
 601         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 602         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 603
 604         &dev_attr_alarms.attr,
 605         &dev_attr_aout_output.attr,
 606
 607         NULL
 608 };
 609
 610 static const struct attribute_group lm87_group = {
 611         .attrs = lm87_attributes,
 612 };
 613
 614 static struct attribute *lm87_attributes_opt[] = {
 615         &dev_attr_in6_input.attr,
 616         &dev_attr_in6_min.attr,
 617         &dev_attr_in6_max.attr,
 618         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 619
 620         &dev_attr_fan1_input.attr,
 621         &dev_attr_fan1_min.attr,
 622         &dev_attr_fan1_div.attr,
 623         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 624
 625         &dev_attr_in7_input.attr,
 626         &dev_attr_in7_min.attr,
 627         &dev_attr_in7_max.attr,
 628         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 629
 630         &dev_attr_fan2_input.attr,
 631         &dev_attr_fan2_min.attr,
 632         &dev_attr_fan2_div.attr,
 633         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 634
 635         &dev_attr_temp3_input.attr,
 636         &dev_attr_temp3_max.attr,
 637         &dev_attr_temp3_min.attr,
 638         &dev_attr_temp3_crit.attr,
 639         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 640         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 641
 642         &dev_attr_in0_input.attr,
 643         &dev_attr_in0_min.attr,
 644         &dev_attr_in0_max.attr,
 645         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 646         &dev_attr_in5_input.attr,
 647         &dev_attr_in5_min.attr,
 648         &dev_attr_in5_max.attr,
 649         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 650
 651         &dev_attr_cpu0_vid.attr,
 652         &dev_attr_vrm.attr,
 653
 654         NULL
 655 };
 656
 657 static const struct attribute_group lm87_group_opt = {
 658         .attrs = lm87_attributes_opt,
 659 };
 660
 661 /*
 662  * The following function does more than just detection. If detection
 663  * succeeds, it also registers the new chip.
 664  */
 665 static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
 666 {
 667         struct i2c_client *new_client;
 668         struct lm87_data *data;
 669         int err = 0;
 670         static const char *names[] = { "lm87", "adm1024" };
 671
 672         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 673                 goto exit;
 674
 675         if (!(data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL))) {
 676                 err = -ENOMEM;
 677                 goto exit;
 678         }
 679
 680         /* The common I2C client data is placed right before the
 681            LM87-specific data. */
 682         new_client = &data->client;
 683         i2c_set_clientdata(new_client, data);
 684         new_client->addr = address;
 685         new_client->adapter = adapter;
 686         new_client->driver = &lm87_driver;
 687         new_client->flags = 0;
 688
 689         /* Default to an LM87 if forced */
 690         if (kind == 0)
 691                 kind = lm87;
 692
 693         /* Now, we do the remaining detection. */
 694         if (kind < 0) {
 695                 u8 cid = lm87_read_value(new_client, LM87_REG_COMPANY_ID);
 696                 u8 rev = lm87_read_value(new_client, LM87_REG_REVISION);
 697
 698                 if (cid == 0x02                 /* National Semiconductor */
 699                  && (rev >= 0x01 && rev <= 0x08))
 700                         kind = lm87;
 701                 else if (cid == 0x41            /* Analog Devices */
 702                       && (rev & 0xf0) == 0x10)
 703                         kind = adm1024;
 704
 705                 if (kind < 0
 706                  || (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)) {
 707                         dev_dbg(&adapter->dev,
 708                                 "LM87 detection failed at 0x%02x.\n",
 709                                 address);
 710                         goto exit_free;
 711                 }
 712         }
 713
 714         /* We can fill in the remaining client fields */
 715         strlcpy(new_client->name, names[kind - 1], I2C_NAME_SIZE);
 716         data->valid = 0;
 717         mutex_init(&data->update_lock);
 718
 719         /* Tell the I2C layer a new client has arrived */
 720         if ((err = i2c_attach_client(new_client)))
 721                 goto exit_free;
 722
 723         /* Initialize the LM87 chip */
 724         lm87_init_client(new_client);
 725
 726         data->in_scale[0] = 2500;
 727         data->in_scale[1] = 2700;
 728         data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
 729         data->in_scale[3] = 5000;
 730         data->in_scale[4] = 12000;
 731         data->in_scale[5] = 2700;
 732         data->in_scale[6] = 1875;
 733         data->in_scale[7] = 1875;
 734
 735         /* Register sysfs hooks */
 736         if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group)))
 737                 goto exit_detach;
 738
 739         if (data->channel & CHAN_NO_FAN(0)) {
 740                 if ((err = device_create_file(&new_client->dev,
 741                                         &dev_attr_in6_input))
 742                  || (err = device_create_file(&new_client->dev,
 743                                         &dev_attr_in6_min))
 744                  || (err = device_create_file(&new_client->dev,
 745                                         &dev_attr_in6_max))
 746                  || (err = device_create_file(&new_client->dev,
 747                                         &sensor_dev_attr_in6_alarm.dev_attr)))
 748                         goto exit_remove;
 749         } else {
 750                 if ((err = device_create_file(&new_client->dev,
 751                                         &dev_attr_fan1_input))
 752                  || (err = device_create_file(&new_client->dev,
 753                                         &dev_attr_fan1_min))
 754                  || (err = device_create_file(&new_client->dev,
 755                                         &dev_attr_fan1_div))
 756                  || (err = device_create_file(&new_client->dev,
 757                                         &sensor_dev_attr_fan1_alarm.dev_attr)))
 758                         goto exit_remove;
 759         }
 760
 761         if (data->channel & CHAN_NO_FAN(1)) {
 762                 if ((err = device_create_file(&new_client->dev,
 763                                         &dev_attr_in7_input))
 764                  || (err = device_create_file(&new_client->dev,
 765                                         &dev_attr_in7_min))
 766                  || (err = device_create_file(&new_client->dev,
 767                                         &dev_attr_in7_max))
 768                  || (err = device_create_file(&new_client->dev,
 769                                         &sensor_dev_attr_in7_alarm.dev_attr)))
 770                         goto exit_remove;
 771         } else {
 772                 if ((err = device_create_file(&new_client->dev,
 773                                         &dev_attr_fan2_input))
 774                  || (err = device_create_file(&new_client->dev,
 775                                         &dev_attr_fan2_min))
 776                  || (err = device_create_file(&new_client->dev,
 777                                         &dev_attr_fan2_div))
 778                  || (err = device_create_file(&new_client->dev,
 779                                         &sensor_dev_attr_fan2_alarm.dev_attr)))
 780                         goto exit_remove;
 781         }
 782
 783         if (data->channel & CHAN_TEMP3) {
 784                 if ((err = device_create_file(&new_client->dev,
 785                                         &dev_attr_temp3_input))
 786                  || (err = device_create_file(&new_client->dev,
 787                                         &dev_attr_temp3_max))
 788                  || (err = device_create_file(&new_client->dev,
 789                                         &dev_attr_temp3_min))
 790                  || (err = device_create_file(&new_client->dev,
 791                                         &dev_attr_temp3_crit))
 792                  || (err = device_create_file(&new_client->dev,
 793                                         &sensor_dev_attr_temp3_alarm.dev_attr))
 794                  || (err = device_create_file(&new_client->dev,
 795                                         &sensor_dev_attr_temp3_fault.dev_attr)))
 796                         goto exit_remove;
 797         } else {
 798                 if ((err = device_create_file(&new_client->dev,
 799                                         &dev_attr_in0_input))
 800                  || (err = device_create_file(&new_client->dev,
 801                                         &dev_attr_in0_min))
 802                  || (err = device_create_file(&new_client->dev,
 803                                         &dev_attr_in0_max))
 804                  || (err = device_create_file(&new_client->dev,
 805                                         &sensor_dev_attr_in0_alarm.dev_attr))
 806                  || (err = device_create_file(&new_client->dev,
 807                                         &dev_attr_in5_input))
 808                  || (err = device_create_file(&new_client->dev,
 809                                         &dev_attr_in5_min))
 810                  || (err = device_create_file(&new_client->dev,
 811                                         &dev_attr_in5_max))
 812                  || (err = device_create_file(&new_client->dev,
 813                                         &sensor_dev_attr_in5_alarm.dev_attr)))
 814                         goto exit_remove;
 815         }
 816
 817         if (!(data->channel & CHAN_NO_VID)) {
 818                 data->vrm = vid_which_vrm();
 819                 if ((err = device_create_file(&new_client->dev,
 820                                         &dev_attr_cpu0_vid))
 821                  || (err = device_create_file(&new_client->dev,
 822                                         &dev_attr_vrm)))
 823                         goto exit_remove;
 824         }
 825
 826         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 827         if (IS_ERR(data->hwmon_dev)) {
 828                 err = PTR_ERR(data->hwmon_dev);
 829                 goto exit_remove;
 830         }
 831
 832         return 0;
 833
 834 exit_remove:
 835         sysfs_remove_group(&new_client->dev.kobj, &lm87_group);
 836         sysfs_remove_group(&new_client->dev.kobj, &lm87_group_opt);
 837 exit_detach:
 838         i2c_detach_client(new_client);
 839 exit_free:
 840         kfree(data);
 841 exit:
 842         return err;
 843 }
 844
 845 static void lm87_init_client(struct i2c_client *client)
 846 {
 847         struct lm87_data *data = i2c_get_clientdata(client);
 848         u8 config;
 849
 850         data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
 851
 852         config = lm87_read_value(client, LM87_REG_CONFIG);
 853         if (!(config & 0x01)) {
 854                 int i;
 855
 856                 /* Limits are left uninitialized after power-up */
 857                 for (i = 1; i < 6; i++) {
 858                         lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
 859                         lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
 860                 }
 861                 for (i = 0; i < 2; i++) {
 862                         lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
 863                         lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
 864                         lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
 865                         lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
 866                 }
 867                 if (data->channel & CHAN_TEMP3) {
 868                         lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
 869                         lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
 870                 } else {
 871                         lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
 872                         lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
 873                 }
 874         }
 875         if ((config & 0x81) != 0x01) {
 876                 /* Start monitoring */
 877                 lm87_write_value(client, LM87_REG_CONFIG,
 878                                  (config & 0xF7) | 0x01);
 879         }
 880 }
 881
 882 static int lm87_detach_client(struct i2c_client *client)
 883 {
 884         struct lm87_data *data = i2c_get_clientdata(client);
 885         int err;
 886
 887         hwmon_device_unregister(data->hwmon_dev);
 888         sysfs_remove_group(&client->dev.kobj, &lm87_group);
 889         sysfs_remove_group(&client->dev.kobj, &lm87_group_opt);
 890
 891         if ((err = i2c_detach_client(client)))
 892                 return err;
 893
 894         kfree(data);
 895         return 0;
 896 }
 897
 898 static struct lm87_data *lm87_update_device(struct device *dev)
 899 {
 900         struct i2c_client *client = to_i2c_client(dev);
 901         struct lm87_data *data = i2c_get_clientdata(client);
 902
 903         mutex_lock(&data->update_lock);
 904
 905         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 906                 int i, j;
 907
 908                 dev_dbg(&client->dev, "Updating data.\n");
 909
 910                 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
 911                 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
 912                 for (; i < j; i++) {
 913                         data->in[i] = lm87_read_value(client,
 914                                       LM87_REG_IN(i));
 915                         data->in_min[i] = lm87_read_value(client,
 916                                           LM87_REG_IN_MIN(i));
 917                         data->in_max[i] = lm87_read_value(client,
 918                                           LM87_REG_IN_MAX(i));
 919                 }
 920
 921                 for (i = 0; i < 2; i++) {
 922                         if (data->channel & CHAN_NO_FAN(i)) {
 923                                 data->in[6+i] = lm87_read_value(client,
 924                                                 LM87_REG_AIN(i));
 925                                 data->in_max[6+i] = lm87_read_value(client,
 926                                                     LM87_REG_AIN_MAX(i));
 927                                 data->in_min[6+i] = lm87_read_value(client,
 928                                                     LM87_REG_AIN_MIN(i));
 929
 930                         } else {
 931                                 data->fan[i] = lm87_read_value(client,
 932                                                LM87_REG_FAN(i));
 933                                 data->fan_min[i] = lm87_read_value(client,
 934                                                    LM87_REG_FAN_MIN(i));
 935                         }
 936                 }
 937
 938                 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
 939                 for (i = 0 ; i < j; i++) {
 940                         data->temp[i] = lm87_read_value(client,
 941                                         LM87_REG_TEMP[i]);
 942                         data->temp_high[i] = lm87_read_value(client,
 943                                              LM87_REG_TEMP_HIGH[i]);
 944                         data->temp_low[i] = lm87_read_value(client,
 945                                             LM87_REG_TEMP_LOW[i]);
 946                 }
 947
 948                 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
 949                 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
 950                 data->temp_crit_int = min(i, j);
 951
 952                 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
 953                 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
 954                 data->temp_crit_ext = min(i, j);
 955
 956                 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 957                 data->fan_div[0] = (i >> 4) & 0x03;
 958                 data->fan_div[1] = (i >> 6) & 0x03;
 959                 data->vid = (i & 0x0F)
 960                           | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
 961                              << 4;
 962
 963                 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
 964                              | (lm87_read_value(client, LM87_REG_ALARMS2)
 965                                 << 8);
 966                 data->aout = lm87_read_value(client, LM87_REG_AOUT);
 967
 968                 data->last_updated = jiffies;
 969                 data->valid = 1;
 970         }
 971
 972         mutex_unlock(&data->update_lock);
 973
 974         return data;
 975 }
 976
 977 static int __init sensors_lm87_init(void)
 978 {
 979         return i2c_add_driver(&lm87_driver);
 980 }
 981
 982 static void __exit sensors_lm87_exit(void)
 983 {
 984         i2c_del_driver(&lm87_driver);
 985 }
 986
 987 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others");
 988 MODULE_DESCRIPTION("LM87 driver");
 989 MODULE_LICENSE("GPL");
 990
 991 module_init(sensors_lm87_init);
 992 module_exit(sensors_lm87_exit);