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 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_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         .attach_adapter = lm87_attach_adapter,
 175         .detach_client  = lm87_detach_client,
 176 };
 177
 178 /*
 179  * Client data (each client gets its own)
 180  */
 181
 182 struct lm87_data {
 183         struct i2c_client client;
 184         struct device *hwmon_dev;
 185         struct mutex update_lock;
 186         char valid; /* zero until following fields are valid */
 187         unsigned long last_updated; /* In jiffies */
 188
 189         u8 channel;             /* register value */
 190
 191         u8 in[8];               /* register value */
 192         u8 in_max[8];           /* register value */
 193         u8 in_min[8];           /* register value */
 194         u16 in_scale[8];
 195
 196         s8 temp[3];             /* register value */
 197         s8 temp_high[3];        /* register value */
 198         s8 temp_low[3];         /* register value */
 199         s8 temp_crit_int;       /* min of two register values */
 200         s8 temp_crit_ext;       /* min of two register values */
 201
 202         u8 fan[2];              /* register value */
 203         u8 fan_min[2];          /* register value */
 204         u8 fan_div[2];          /* register value, shifted right */
 205         u8 aout;                /* register value */
 206
 207         u16 alarms;             /* register values, combined */
 208         u8 vid;                 /* register values, combined */
 209         u8 vrm;
 210 };
 211
 212 /*
 213  * Sysfs stuff
 214  */
 215
 216 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 217 {
 218         return i2c_smbus_read_byte_data(client, reg);
 219 }
 220
 221 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 222 {
 223         return i2c_smbus_write_byte_data(client, reg, value);
 224 }
 225
 226 #define show_in(offset) \
 227 static ssize_t show_in##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 228 { \
 229         struct lm87_data *data = lm87_update_device(dev); \
 230         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
 231                        data->in_scale[offset])); \
 232 } \
 233 static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 234 { \
 235         struct lm87_data *data = lm87_update_device(dev); \
 236         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
 237                        data->in_scale[offset])); \
 238 } \
 239 static ssize_t show_in##offset##_max(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_max[offset], \
 243                        data->in_scale[offset])); \
 244 } \
 245 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 246                 show_in##offset##_input, NULL);
 247 show_in(0);
 248 show_in(1);
 249 show_in(2);
 250 show_in(3);
 251 show_in(4);
 252 show_in(5);
 253 show_in(6);
 254 show_in(7);
 255
 256 static void set_in_min(struct device *dev, const char *buf, int nr)
 257 {
 258         struct i2c_client *client = to_i2c_client(dev);
 259         struct lm87_data *data = i2c_get_clientdata(client);
 260         long val = simple_strtol(buf, NULL, 10);
 261
 262         mutex_lock(&data->update_lock);
 263         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
 264         lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
 265                          LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
 266         mutex_unlock(&data->update_lock);
 267 }
 268
 269 static void set_in_max(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_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
 277         lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
 278                          LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
 279         mutex_unlock(&data->update_lock);
 280 }
 281
 282 #define set_in(offset) \
 283 static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, \
 284                 const char *buf, size_t count) \
 285 { \
 286         set_in_min(dev, buf, offset); \
 287         return count; \
 288 } \
 289 static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, \
 290                 const char *buf, size_t count) \
 291 { \
 292         set_in_max(dev, buf, offset); \
 293         return count; \
 294 } \
 295 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
 296                 show_in##offset##_min, set_in##offset##_min); \
 297 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
 298                 show_in##offset##_max, set_in##offset##_max);
 299 set_in(0);
 300 set_in(1);
 301 set_in(2);
 302 set_in(3);
 303 set_in(4);
 304 set_in(5);
 305 set_in(6);
 306 set_in(7);
 307
 308 #define show_temp(offset) \
 309 static ssize_t show_temp##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 310 { \
 311         struct lm87_data *data = lm87_update_device(dev); \
 312         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
 313 } \
 314 static ssize_t show_temp##offset##_low(struct device *dev, struct device_attribute *attr, char *buf) \
 315 { \
 316         struct lm87_data *data = lm87_update_device(dev); \
 317         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
 318 } \
 319 static ssize_t show_temp##offset##_high(struct device *dev, struct device_attribute *attr, char *buf) \
 320 { \
 321         struct lm87_data *data = lm87_update_device(dev); \
 322         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
 323 }\
 324 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 325                 show_temp##offset##_input, NULL);
 326 show_temp(1);
 327 show_temp(2);
 328 show_temp(3);
 329
 330 static void set_temp_low(struct device *dev, const char *buf, int nr)
 331 {
 332         struct i2c_client *client = to_i2c_client(dev);
 333         struct lm87_data *data = i2c_get_clientdata(client);
 334         long val = simple_strtol(buf, NULL, 10);
 335
 336         mutex_lock(&data->update_lock);
 337         data->temp_low[nr] = TEMP_TO_REG(val);
 338         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
 339         mutex_unlock(&data->update_lock);
 340 }
 341
 342 static void set_temp_high(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_high[nr] = TEMP_TO_REG(val);
 350         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
 351         mutex_unlock(&data->update_lock);
 352 }
 353
 354 #define set_temp(offset) \
 355 static ssize_t set_temp##offset##_low(struct device *dev, struct device_attribute *attr, \
 356                 const char *buf, size_t count) \
 357 { \
 358         set_temp_low(dev, buf, offset-1); \
 359         return count; \
 360 } \
 361 static ssize_t set_temp##offset##_high(struct device *dev, struct device_attribute *attr, \
 362                 const char *buf, size_t count) \
 363 { \
 364         set_temp_high(dev, buf, offset-1); \
 365         return count; \
 366 } \
 367 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
 368                 show_temp##offset##_high, set_temp##offset##_high); \
 369 static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
 370                 show_temp##offset##_low, set_temp##offset##_low);
 371 set_temp(1);
 372 set_temp(2);
 373 set_temp(3);
 374
 375 static ssize_t show_temp_crit_int(struct device *dev, struct device_attribute *attr, char *buf)
 376 {
 377         struct lm87_data *data = lm87_update_device(dev);
 378         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
 379 }
 380
 381 static ssize_t show_temp_crit_ext(struct device *dev, struct device_attribute *attr, char *buf)
 382 {
 383         struct lm87_data *data = lm87_update_device(dev);
 384         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
 385 }
 386
 387 static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
 388 static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
 389 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
 390
 391 #define show_fan(offset) \
 392 static ssize_t show_fan##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 393 { \
 394         struct lm87_data *data = lm87_update_device(dev); \
 395         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \
 396                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 397 } \
 398 static ssize_t show_fan##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 399 { \
 400         struct lm87_data *data = lm87_update_device(dev); \
 401         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \
 402                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 403 } \
 404 static ssize_t show_fan##offset##_div(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_DIV_FROM_REG(data->fan_div[offset-1])); \
 408 } \
 409 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
 410                 show_fan##offset##_input, NULL);
 411 show_fan(1);
 412 show_fan(2);
 413
 414 static void set_fan_min(struct device *dev, const char *buf, int nr)
 415 {
 416         struct i2c_client *client = to_i2c_client(dev);
 417         struct lm87_data *data = i2c_get_clientdata(client);
 418         long val = simple_strtol(buf, NULL, 10);
 419
 420         mutex_lock(&data->update_lock);
 421         data->fan_min[nr] = FAN_TO_REG(val,
 422                             FAN_DIV_FROM_REG(data->fan_div[nr]));
 423         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
 424         mutex_unlock(&data->update_lock);
 425 }
 426
 427 /* Note: we save and restore the fan minimum here, because its value is
 428    determined in part by the fan clock divider.  This follows the principle
 429    of least surprise; the user doesn't expect the fan minimum to change just
 430    because the divider changed. */
 431 static ssize_t set_fan_div(struct device *dev, const char *buf,
 432                 size_t count, int nr)
 433 {
 434         struct i2c_client *client = to_i2c_client(dev);
 435         struct lm87_data *data = i2c_get_clientdata(client);
 436         long val = simple_strtol(buf, NULL, 10);
 437         unsigned long min;
 438         u8 reg;
 439
 440         mutex_lock(&data->update_lock);
 441         min = FAN_FROM_REG(data->fan_min[nr],
 442                            FAN_DIV_FROM_REG(data->fan_div[nr]));
 443
 444         switch (val) {
 445         case 1: data->fan_div[nr] = 0; break;
 446         case 2: data->fan_div[nr] = 1; break;
 447         case 4: data->fan_div[nr] = 2; break;
 448         case 8: data->fan_div[nr] = 3; break;
 449         default:
 450                 mutex_unlock(&data->update_lock);
 451                 return -EINVAL;
 452         }
 453
 454         reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 455         switch (nr) {
 456         case 0:
 457             reg = (reg & 0xCF) | (data->fan_div[0] << 4);
 458             break;
 459         case 1:
 460             reg = (reg & 0x3F) | (data->fan_div[1] << 6);
 461             break;
 462         }
 463         lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
 464
 465         data->fan_min[nr] = FAN_TO_REG(min, val);
 466         lm87_write_value(client, LM87_REG_FAN_MIN(nr),
 467                          data->fan_min[nr]);
 468         mutex_unlock(&data->update_lock);
 469
 470         return count;
 471 }
 472
 473 #define set_fan(offset) \
 474 static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
 475                 size_t count) \
 476 { \
 477         set_fan_min(dev, buf, offset-1); \
 478         return count; \
 479 } \
 480 static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \
 481                 size_t count) \
 482 { \
 483         return set_fan_div(dev, buf, count, offset-1); \
 484 } \
 485 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 486                 show_fan##offset##_min, set_fan##offset##_min); \
 487 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 488                 show_fan##offset##_div, set_fan##offset##_div);
 489 set_fan(1);
 490 set_fan(2);
 491
 492 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 493 {
 494         struct lm87_data *data = lm87_update_device(dev);
 495         return sprintf(buf, "%d\n", data->alarms);
 496 }
 497 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 498
 499 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 500 {
 501         struct lm87_data *data = lm87_update_device(dev);
 502         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 503 }
 504 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 505
 506 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 507 {
 508         struct lm87_data *data = dev_get_drvdata(dev);
 509         return sprintf(buf, "%d\n", data->vrm);
 510 }
 511 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 512 {
 513         struct lm87_data *data = dev_get_drvdata(dev);
 514         data->vrm = simple_strtoul(buf, NULL, 10);
 515         return count;
 516 }
 517 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 518
 519 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
 520 {
 521         struct lm87_data *data = lm87_update_device(dev);
 522         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 523 }
 524 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 525 {
 526         struct i2c_client *client = to_i2c_client(dev);
 527         struct lm87_data *data = i2c_get_clientdata(client);
 528         long val = simple_strtol(buf, NULL, 10);
 529
 530         mutex_lock(&data->update_lock);
 531         data->aout = AOUT_TO_REG(val);
 532         lm87_write_value(client, LM87_REG_AOUT, data->aout);
 533         mutex_unlock(&data->update_lock);
 534         return count;
 535 }
 536 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 537
 538 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 539                           char *buf)
 540 {
 541         struct lm87_data *data = lm87_update_device(dev);
 542         int bitnr = to_sensor_dev_attr(attr)->index;
 543         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 544 }
 545 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 546 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 547 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 548 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 549 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 550 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 551 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
 552 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
 553 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 554 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 555 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
 556 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 557 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 558 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
 559 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
 560
 561 /*
 562  * Real code
 563  */
 564
 565 static int lm87_attach_adapter(struct i2c_adapter *adapter)
 566 {
 567         if (!(adapter->class & I2C_CLASS_HWMON))
 568                 return 0;
 569         return i2c_probe(adapter, &addr_data, lm87_detect);
 570 }
 571
 572 static struct attribute *lm87_attributes[] = {
 573         &dev_attr_in1_input.attr,
 574         &dev_attr_in1_min.attr,
 575         &dev_attr_in1_max.attr,
 576         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 577         &dev_attr_in2_input.attr,
 578         &dev_attr_in2_min.attr,
 579         &dev_attr_in2_max.attr,
 580         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 581         &dev_attr_in3_input.attr,
 582         &dev_attr_in3_min.attr,
 583         &dev_attr_in3_max.attr,
 584         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 585         &dev_attr_in4_input.attr,
 586         &dev_attr_in4_min.attr,
 587         &dev_attr_in4_max.attr,
 588         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 589
 590         &dev_attr_temp1_input.attr,
 591         &dev_attr_temp1_max.attr,
 592         &dev_attr_temp1_min.attr,
 593         &dev_attr_temp1_crit.attr,
 594         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 595         &dev_attr_temp2_input.attr,
 596         &dev_attr_temp2_max.attr,
 597         &dev_attr_temp2_min.attr,
 598         &dev_attr_temp2_crit.attr,
 599         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 600         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 601
 602         &dev_attr_alarms.attr,
 603         &dev_attr_aout_output.attr,
 604
 605         NULL
 606 };
 607
 608 static const struct attribute_group lm87_group = {
 609         .attrs = lm87_attributes,
 610 };
 611
 612 static struct attribute *lm87_attributes_opt[] = {
 613         &dev_attr_in6_input.attr,
 614         &dev_attr_in6_min.attr,
 615         &dev_attr_in6_max.attr,
 616         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 617
 618         &dev_attr_fan1_input.attr,
 619         &dev_attr_fan1_min.attr,
 620         &dev_attr_fan1_div.attr,
 621         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 622
 623         &dev_attr_in7_input.attr,
 624         &dev_attr_in7_min.attr,
 625         &dev_attr_in7_max.attr,
 626         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 627
 628         &dev_attr_fan2_input.attr,
 629         &dev_attr_fan2_min.attr,
 630         &dev_attr_fan2_div.attr,
 631         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 632
 633         &dev_attr_temp3_input.attr,
 634         &dev_attr_temp3_max.attr,
 635         &dev_attr_temp3_min.attr,
 636         &dev_attr_temp3_crit.attr,
 637         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 638         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 639
 640         &dev_attr_in0_input.attr,
 641         &dev_attr_in0_min.attr,
 642         &dev_attr_in0_max.attr,
 643         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 644         &dev_attr_in5_input.attr,
 645         &dev_attr_in5_min.attr,
 646         &dev_attr_in5_max.attr,
 647         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 648
 649         &dev_attr_cpu0_vid.attr,
 650         &dev_attr_vrm.attr,
 651
 652         NULL
 653 };
 654
 655 static const struct attribute_group lm87_group_opt = {
 656         .attrs = lm87_attributes_opt,
 657 };
 658
 659 /*
 660  * The following function does more than just detection. If detection
 661  * succeeds, it also registers the new chip.
 662  */
 663 static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
 664 {
 665         struct i2c_client *new_client;
 666         struct lm87_data *data;
 667         int err = 0;
 668         static const char *names[] = { "lm87", "adm1024" };
 669
 670         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 671                 goto exit;
 672
 673         if (!(data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL))) {
 674                 err = -ENOMEM;
 675                 goto exit;
 676         }
 677
 678         /* The common I2C client data is placed right before the
 679            LM87-specific data. */
 680         new_client = &data->client;
 681         i2c_set_clientdata(new_client, data);
 682         new_client->addr = address;
 683         new_client->adapter = adapter;
 684         new_client->driver = &lm87_driver;
 685         new_client->flags = 0;
 686
 687         /* Default to an LM87 if forced */
 688         if (kind == 0)
 689                 kind = lm87;
 690
 691         /* Now, we do the remaining detection. */
 692         if (kind < 0) {
 693                 u8 cid = lm87_read_value(new_client, LM87_REG_COMPANY_ID);
 694                 u8 rev = lm87_read_value(new_client, LM87_REG_REVISION);
 695
 696                 if (cid == 0x02                 /* National Semiconductor */
 697                  && (rev >= 0x01 && rev <= 0x08))
 698                         kind = lm87;
 699                 else if (cid == 0x41            /* Analog Devices */
 700                       && (rev & 0xf0) == 0x10)
 701                         kind = adm1024;
 702
 703                 if (kind < 0
 704                  || (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)) {
 705                         dev_dbg(&adapter->dev,
 706                                 "LM87 detection failed at 0x%02x.\n",
 707                                 address);
 708                         goto exit_free;
 709                 }
 710         }
 711
 712         /* We can fill in the remaining client fields */
 713         strlcpy(new_client->name, names[kind - 1], I2C_NAME_SIZE);
 714         data->valid = 0;
 715         mutex_init(&data->update_lock);
 716
 717         /* Tell the I2C layer a new client has arrived */
 718         if ((err = i2c_attach_client(new_client)))
 719                 goto exit_free;
 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_detach;
 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_detach:
 836         i2c_detach_client(new_client);
 837 exit_free:
 838         kfree(data);
 839 exit:
 840         return err;
 841 }
 842
 843 static void lm87_init_client(struct i2c_client *client)
 844 {
 845         struct lm87_data *data = i2c_get_clientdata(client);
 846         u8 config;
 847
 848         data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
 849
 850         config = lm87_read_value(client, LM87_REG_CONFIG);
 851         if (!(config & 0x01)) {
 852                 int i;
 853
 854                 /* Limits are left uninitialized after power-up */
 855                 for (i = 1; i < 6; i++) {
 856                         lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
 857                         lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
 858                 }
 859                 for (i = 0; i < 2; i++) {
 860                         lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
 861                         lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
 862                         lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
 863                         lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
 864                 }
 865                 if (data->channel & CHAN_TEMP3) {
 866                         lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
 867                         lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
 868                 } else {
 869                         lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
 870                         lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
 871                 }
 872         }
 873         if ((config & 0x81) != 0x01) {
 874                 /* Start monitoring */
 875                 lm87_write_value(client, LM87_REG_CONFIG,
 876                                  (config & 0xF7) | 0x01);
 877         }
 878 }
 879
 880 static int lm87_detach_client(struct i2c_client *client)
 881 {
 882         struct lm87_data *data = i2c_get_clientdata(client);
 883         int err;
 884
 885         hwmon_device_unregister(data->hwmon_dev);
 886         sysfs_remove_group(&client->dev.kobj, &lm87_group);
 887         sysfs_remove_group(&client->dev.kobj, &lm87_group_opt);
 888
 889         if ((err = i2c_detach_client(client)))
 890                 return err;
 891
 892         kfree(data);
 893         return 0;
 894 }
 895
 896 static struct lm87_data *lm87_update_device(struct device *dev)
 897 {
 898         struct i2c_client *client = to_i2c_client(dev);
 899         struct lm87_data *data = i2c_get_clientdata(client);
 900
 901         mutex_lock(&data->update_lock);
 902
 903         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 904                 int i, j;
 905
 906                 dev_dbg(&client->dev, "Updating data.\n");
 907
 908                 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
 909                 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
 910                 for (; i < j; i++) {
 911                         data->in[i] = lm87_read_value(client,
 912                                       LM87_REG_IN(i));
 913                         data->in_min[i] = lm87_read_value(client,
 914                                           LM87_REG_IN_MIN(i));
 915                         data->in_max[i] = lm87_read_value(client,
 916                                           LM87_REG_IN_MAX(i));
 917                 }
 918
 919                 for (i = 0; i < 2; i++) {
 920                         if (data->channel & CHAN_NO_FAN(i)) {
 921                                 data->in[6+i] = lm87_read_value(client,
 922                                                 LM87_REG_AIN(i));
 923                                 data->in_max[6+i] = lm87_read_value(client,
 924                                                     LM87_REG_AIN_MAX(i));
 925                                 data->in_min[6+i] = lm87_read_value(client,
 926                                                     LM87_REG_AIN_MIN(i));
 927
 928                         } else {
 929                                 data->fan[i] = lm87_read_value(client,
 930                                                LM87_REG_FAN(i));
 931                                 data->fan_min[i] = lm87_read_value(client,
 932                                                    LM87_REG_FAN_MIN(i));
 933                         }
 934                 }
 935
 936                 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
 937                 for (i = 0 ; i < j; i++) {
 938                         data->temp[i] = lm87_read_value(client,
 939                                         LM87_REG_TEMP[i]);
 940                         data->temp_high[i] = lm87_read_value(client,
 941                                              LM87_REG_TEMP_HIGH[i]);
 942                         data->temp_low[i] = lm87_read_value(client,
 943                                             LM87_REG_TEMP_LOW[i]);
 944                 }
 945
 946                 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
 947                 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
 948                 data->temp_crit_int = min(i, j);
 949
 950                 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
 951                 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
 952                 data->temp_crit_ext = min(i, j);
 953
 954                 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 955                 data->fan_div[0] = (i >> 4) & 0x03;
 956                 data->fan_div[1] = (i >> 6) & 0x03;
 957                 data->vid = (i & 0x0F)
 958                           | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
 959                              << 4;
 960
 961                 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
 962                              | (lm87_read_value(client, LM87_REG_ALARMS2)
 963                                 << 8);
 964                 data->aout = lm87_read_value(client, LM87_REG_AOUT);
 965
 966                 data->last_updated = jiffies;
 967                 data->valid = 1;
 968         }
 969
 970         mutex_unlock(&data->update_lock);
 971
 972         return data;
 973 }
 974
 975 static int __init sensors_lm87_init(void)
 976 {
 977         return i2c_add_driver(&lm87_driver);
 978 }
 979
 980 static void __exit sensors_lm87_exit(void)
 981 {
 982         i2c_del_driver(&lm87_driver);
 983 }
 984
 985 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others");
 986 MODULE_DESCRIPTION("LM87 driver");
 987 MODULE_LICENSE("GPL");
 988
 989 module_init(sensors_lm87_init);
 990 module_exit(sensors_lm87_exit);