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 enum chips { lm87, adm1024 };
  78
  79 /*
  80  * The LM87 registers
  81  */
  82
  83 /* nr in 0..5 */
  84 #define LM87_REG_IN(nr)                 (0x20 + (nr))
  85 #define LM87_REG_IN_MAX(nr)             (0x2B + (nr) * 2)
  86 #define LM87_REG_IN_MIN(nr)             (0x2C + (nr) * 2)
  87 /* nr in 0..1 */
  88 #define LM87_REG_AIN(nr)                (0x28 + (nr))
  89 #define LM87_REG_AIN_MIN(nr)            (0x1A + (nr))
  90 #define LM87_REG_AIN_MAX(nr)            (0x3B + (nr))
  91
  92 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  93 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  94 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  95
  96 #define LM87_REG_TEMP_HW_INT_LOCK       0x13
  97 #define LM87_REG_TEMP_HW_EXT_LOCK       0x14
  98 #define LM87_REG_TEMP_HW_INT            0x17
  99 #define LM87_REG_TEMP_HW_EXT            0x18
 100
 101 /* nr in 0..1 */
 102 #define LM87_REG_FAN(nr)                (0x28 + (nr))
 103 #define LM87_REG_FAN_MIN(nr)            (0x3B + (nr))
 104 #define LM87_REG_AOUT                   0x19
 105
 106 #define LM87_REG_CONFIG                 0x40
 107 #define LM87_REG_CHANNEL_MODE           0x16
 108 #define LM87_REG_VID_FAN_DIV            0x47
 109 #define LM87_REG_VID4                   0x49
 110
 111 #define LM87_REG_ALARMS1                0x41
 112 #define LM87_REG_ALARMS2                0x42
 113
 114 #define LM87_REG_COMPANY_ID             0x3E
 115 #define LM87_REG_REVISION               0x3F
 116
 117 /*
 118  * Conversions and various macros
 119  * The LM87 uses signed 8-bit values for temperatures.
 120  */
 121
 122 #define IN_FROM_REG(reg,scale)  (((reg) * (scale) + 96) / 192)
 123 #define IN_TO_REG(val,scale)    ((val) <= 0 ? 0 : \
 124                                  (val) * 192 >= (scale) * 255 ? 255 : \
 125                                  ((val) * 192 + (scale)/2) / (scale))
 126
 127 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
 128 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 129                                  (val) >= 126500 ? 127 : \
 130                                  (((val) < 0 ? (val)-500 : (val)+500) / 1000))
 131
 132 #define FAN_FROM_REG(reg,div)   ((reg) == 255 || (reg) == 0 ? 0 : \
 133                                  (1350000 + (reg)*(div) / 2) / ((reg)*(div)))
 134 #define FAN_TO_REG(val,div)     ((val)*(div) * 255 <= 1350000 ? 255 : \
 135                                  (1350000 + (val)*(div) / 2) / ((val)*(div)))
 136
 137 #define FAN_DIV_FROM_REG(reg)   (1 << (reg))
 138
 139 /* analog out is 9.80mV/LSB */
 140 #define AOUT_FROM_REG(reg)      (((reg) * 98 + 5) / 10)
 141 #define AOUT_TO_REG(val)        ((val) <= 0 ? 0 : \
 142                                  (val) >= 2500 ? 255 : \
 143                                  ((val) * 10 + 49) / 98)
 144
 145 /* nr in 0..1 */
 146 #define CHAN_NO_FAN(nr)         (1 << (nr))
 147 #define CHAN_TEMP3              (1 << 2)
 148 #define CHAN_VCC_5V             (1 << 3)
 149 #define CHAN_NO_VID             (1 << 7)
 150
 151 /*
 152  * Functions declaration
 153  */
 154
 155 static int lm87_probe(struct i2c_client *client,
 156                       const struct i2c_device_id *id);
 157 static int lm87_detect(struct i2c_client *new_client,
 158                        struct i2c_board_info *info);
 159 static void lm87_init_client(struct i2c_client *client);
 160 static int lm87_remove(struct i2c_client *client);
 161 static struct lm87_data *lm87_update_device(struct device *dev);
 162
 163 /*
 164  * Driver data (common to all clients)
 165  */
 166
 167 static const struct i2c_device_id lm87_id[] = {
 168         { "lm87", lm87 },
 169         { "adm1024", adm1024 },
 170         { }
 171 };
 172 MODULE_DEVICE_TABLE(i2c, lm87_id);
 173
 174 static struct i2c_driver lm87_driver = {
 175         .class          = I2C_CLASS_HWMON,
 176         .driver = {
 177                 .name   = "lm87",
 178         },
 179         .probe          = lm87_probe,
 180         .remove         = lm87_remove,
 181         .id_table       = lm87_id,
 182         .detect         = lm87_detect,
 183         .address_list   = normal_i2c,
 184 };
 185
 186 /*
 187  * Client data (each client gets its own)
 188  */
 189
 190 struct lm87_data {
 191         struct device *hwmon_dev;
 192         struct mutex update_lock;
 193         char valid; /* zero until following fields are valid */
 194         unsigned long last_updated; /* In jiffies */
 195
 196         u8 channel;             /* register value */
 197         u8 config;              /* original register value */
 198
 199         u8 in[8];               /* register value */
 200         u8 in_max[8];           /* register value */
 201         u8 in_min[8];           /* register value */
 202         u16 in_scale[8];
 203
 204         s8 temp[3];             /* register value */
 205         s8 temp_high[3];        /* register value */
 206         s8 temp_low[3];         /* register value */
 207         s8 temp_crit_int;       /* min of two register values */
 208         s8 temp_crit_ext;       /* min of two register values */
 209
 210         u8 fan[2];              /* register value */
 211         u8 fan_min[2];          /* register value */
 212         u8 fan_div[2];          /* register value, shifted right */
 213         u8 aout;                /* register value */
 214
 215         u16 alarms;             /* register values, combined */
 216         u8 vid;                 /* register values, combined */
 217         u8 vrm;
 218 };
 219
 220 /*
 221  * Sysfs stuff
 222  */
 223
 224 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 225 {
 226         return i2c_smbus_read_byte_data(client, reg);
 227 }
 228
 229 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 230 {
 231         return i2c_smbus_write_byte_data(client, reg, value);
 232 }
 233
 234 #define show_in(offset) \
 235 static ssize_t show_in##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 236 { \
 237         struct lm87_data *data = lm87_update_device(dev); \
 238         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
 239                        data->in_scale[offset])); \
 240 } \
 241 static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 242 { \
 243         struct lm87_data *data = lm87_update_device(dev); \
 244         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
 245                        data->in_scale[offset])); \
 246 } \
 247 static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
 248 { \
 249         struct lm87_data *data = lm87_update_device(dev); \
 250         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
 251                        data->in_scale[offset])); \
 252 } \
 253 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 254                 show_in##offset##_input, NULL);
 255 show_in(0);
 256 show_in(1);
 257 show_in(2);
 258 show_in(3);
 259 show_in(4);
 260 show_in(5);
 261 show_in(6);
 262 show_in(7);
 263
 264 static void set_in_min(struct device *dev, const char *buf, int nr)
 265 {
 266         struct i2c_client *client = to_i2c_client(dev);
 267         struct lm87_data *data = i2c_get_clientdata(client);
 268         long val = simple_strtol(buf, NULL, 10);
 269
 270         mutex_lock(&data->update_lock);
 271         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
 272         lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
 273                          LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
 274         mutex_unlock(&data->update_lock);
 275 }
 276
 277 static void set_in_max(struct device *dev, const char *buf, int nr)
 278 {
 279         struct i2c_client *client = to_i2c_client(dev);
 280         struct lm87_data *data = i2c_get_clientdata(client);
 281         long val = simple_strtol(buf, NULL, 10);
 282
 283         mutex_lock(&data->update_lock);
 284         data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
 285         lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
 286                          LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
 287         mutex_unlock(&data->update_lock);
 288 }
 289
 290 #define set_in(offset) \
 291 static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, \
 292                 const char *buf, size_t count) \
 293 { \
 294         set_in_min(dev, buf, offset); \
 295         return count; \
 296 } \
 297 static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, \
 298                 const char *buf, size_t count) \
 299 { \
 300         set_in_max(dev, buf, offset); \
 301         return count; \
 302 } \
 303 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
 304                 show_in##offset##_min, set_in##offset##_min); \
 305 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
 306                 show_in##offset##_max, set_in##offset##_max);
 307 set_in(0);
 308 set_in(1);
 309 set_in(2);
 310 set_in(3);
 311 set_in(4);
 312 set_in(5);
 313 set_in(6);
 314 set_in(7);
 315
 316 #define show_temp(offset) \
 317 static ssize_t show_temp##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 318 { \
 319         struct lm87_data *data = lm87_update_device(dev); \
 320         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
 321 } \
 322 static ssize_t show_temp##offset##_low(struct device *dev, struct device_attribute *attr, char *buf) \
 323 { \
 324         struct lm87_data *data = lm87_update_device(dev); \
 325         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
 326 } \
 327 static ssize_t show_temp##offset##_high(struct device *dev, struct device_attribute *attr, char *buf) \
 328 { \
 329         struct lm87_data *data = lm87_update_device(dev); \
 330         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
 331 }\
 332 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 333                 show_temp##offset##_input, NULL);
 334 show_temp(1);
 335 show_temp(2);
 336 show_temp(3);
 337
 338 static void set_temp_low(struct device *dev, const char *buf, int nr)
 339 {
 340         struct i2c_client *client = to_i2c_client(dev);
 341         struct lm87_data *data = i2c_get_clientdata(client);
 342         long val = simple_strtol(buf, NULL, 10);
 343
 344         mutex_lock(&data->update_lock);
 345         data->temp_low[nr] = TEMP_TO_REG(val);
 346         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
 347         mutex_unlock(&data->update_lock);
 348 }
 349
 350 static void set_temp_high(struct device *dev, const char *buf, int nr)
 351 {
 352         struct i2c_client *client = to_i2c_client(dev);
 353         struct lm87_data *data = i2c_get_clientdata(client);
 354         long val = simple_strtol(buf, NULL, 10);
 355
 356         mutex_lock(&data->update_lock);
 357         data->temp_high[nr] = TEMP_TO_REG(val);
 358         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
 359         mutex_unlock(&data->update_lock);
 360 }
 361
 362 #define set_temp(offset) \
 363 static ssize_t set_temp##offset##_low(struct device *dev, struct device_attribute *attr, \
 364                 const char *buf, size_t count) \
 365 { \
 366         set_temp_low(dev, buf, offset-1); \
 367         return count; \
 368 } \
 369 static ssize_t set_temp##offset##_high(struct device *dev, struct device_attribute *attr, \
 370                 const char *buf, size_t count) \
 371 { \
 372         set_temp_high(dev, buf, offset-1); \
 373         return count; \
 374 } \
 375 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
 376                 show_temp##offset##_high, set_temp##offset##_high); \
 377 static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
 378                 show_temp##offset##_low, set_temp##offset##_low);
 379 set_temp(1);
 380 set_temp(2);
 381 set_temp(3);
 382
 383 static ssize_t show_temp_crit_int(struct device *dev, struct device_attribute *attr, char *buf)
 384 {
 385         struct lm87_data *data = lm87_update_device(dev);
 386         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
 387 }
 388
 389 static ssize_t show_temp_crit_ext(struct device *dev, struct device_attribute *attr, char *buf)
 390 {
 391         struct lm87_data *data = lm87_update_device(dev);
 392         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
 393 }
 394
 395 static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
 396 static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
 397 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
 398
 399 #define show_fan(offset) \
 400 static ssize_t show_fan##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
 401 { \
 402         struct lm87_data *data = lm87_update_device(dev); \
 403         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \
 404                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 405 } \
 406 static ssize_t show_fan##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
 407 { \
 408         struct lm87_data *data = lm87_update_device(dev); \
 409         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \
 410                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
 411 } \
 412 static ssize_t show_fan##offset##_div(struct device *dev, struct device_attribute *attr, char *buf) \
 413 { \
 414         struct lm87_data *data = lm87_update_device(dev); \
 415         return sprintf(buf, "%d\n", FAN_DIV_FROM_REG(data->fan_div[offset-1])); \
 416 } \
 417 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
 418                 show_fan##offset##_input, NULL);
 419 show_fan(1);
 420 show_fan(2);
 421
 422 static void set_fan_min(struct device *dev, const char *buf, int nr)
 423 {
 424         struct i2c_client *client = to_i2c_client(dev);
 425         struct lm87_data *data = i2c_get_clientdata(client);
 426         long val = simple_strtol(buf, NULL, 10);
 427
 428         mutex_lock(&data->update_lock);
 429         data->fan_min[nr] = FAN_TO_REG(val,
 430                             FAN_DIV_FROM_REG(data->fan_div[nr]));
 431         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
 432         mutex_unlock(&data->update_lock);
 433 }
 434
 435 /* Note: we save and restore the fan minimum here, because its value is
 436    determined in part by the fan clock divider.  This follows the principle
 437    of least surprise; the user doesn't expect the fan minimum to change just
 438    because the divider changed. */
 439 static ssize_t set_fan_div(struct device *dev, const char *buf,
 440                 size_t count, int nr)
 441 {
 442         struct i2c_client *client = to_i2c_client(dev);
 443         struct lm87_data *data = i2c_get_clientdata(client);
 444         long val = simple_strtol(buf, NULL, 10);
 445         unsigned long min;
 446         u8 reg;
 447
 448         mutex_lock(&data->update_lock);
 449         min = FAN_FROM_REG(data->fan_min[nr],
 450                            FAN_DIV_FROM_REG(data->fan_div[nr]));
 451
 452         switch (val) {
 453         case 1: data->fan_div[nr] = 0; break;
 454         case 2: data->fan_div[nr] = 1; break;
 455         case 4: data->fan_div[nr] = 2; break;
 456         case 8: data->fan_div[nr] = 3; break;
 457         default:
 458                 mutex_unlock(&data->update_lock);
 459                 return -EINVAL;
 460         }
 461
 462         reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 463         switch (nr) {
 464         case 0:
 465             reg = (reg & 0xCF) | (data->fan_div[0] << 4);
 466             break;
 467         case 1:
 468             reg = (reg & 0x3F) | (data->fan_div[1] << 6);
 469             break;
 470         }
 471         lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
 472
 473         data->fan_min[nr] = FAN_TO_REG(min, val);
 474         lm87_write_value(client, LM87_REG_FAN_MIN(nr),
 475                          data->fan_min[nr]);
 476         mutex_unlock(&data->update_lock);
 477
 478         return count;
 479 }
 480
 481 #define set_fan(offset) \
 482 static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
 483                 size_t count) \
 484 { \
 485         set_fan_min(dev, buf, offset-1); \
 486         return count; \
 487 } \
 488 static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \
 489                 size_t count) \
 490 { \
 491         return set_fan_div(dev, buf, count, offset-1); \
 492 } \
 493 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 494                 show_fan##offset##_min, set_fan##offset##_min); \
 495 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 496                 show_fan##offset##_div, set_fan##offset##_div);
 497 set_fan(1);
 498 set_fan(2);
 499
 500 static ssize_t show_alarms(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", data->alarms);
 504 }
 505 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 506
 507 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 508 {
 509         struct lm87_data *data = lm87_update_device(dev);
 510         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 511 }
 512 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 513
 514 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 515 {
 516         struct lm87_data *data = dev_get_drvdata(dev);
 517         return sprintf(buf, "%d\n", data->vrm);
 518 }
 519 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 520 {
 521         struct lm87_data *data = dev_get_drvdata(dev);
 522         data->vrm = simple_strtoul(buf, NULL, 10);
 523         return count;
 524 }
 525 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 526
 527 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
 528 {
 529         struct lm87_data *data = lm87_update_device(dev);
 530         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 531 }
 532 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 533 {
 534         struct i2c_client *client = to_i2c_client(dev);
 535         struct lm87_data *data = i2c_get_clientdata(client);
 536         long val = simple_strtol(buf, NULL, 10);
 537
 538         mutex_lock(&data->update_lock);
 539         data->aout = AOUT_TO_REG(val);
 540         lm87_write_value(client, LM87_REG_AOUT, data->aout);
 541         mutex_unlock(&data->update_lock);
 542         return count;
 543 }
 544 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 545
 546 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 547                           char *buf)
 548 {
 549         struct lm87_data *data = lm87_update_device(dev);
 550         int bitnr = to_sensor_dev_attr(attr)->index;
 551         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 552 }
 553 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 554 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 555 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 556 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 557 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 558 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 559 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
 560 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
 561 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 562 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 563 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
 564 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 565 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 566 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
 567 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
 568
 569 /*
 570  * Real code
 571  */
 572
 573 static struct attribute *lm87_attributes[] = {
 574         &dev_attr_in1_input.attr,
 575         &dev_attr_in1_min.attr,
 576         &dev_attr_in1_max.attr,
 577         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 578         &dev_attr_in2_input.attr,
 579         &dev_attr_in2_min.attr,
 580         &dev_attr_in2_max.attr,
 581         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 582         &dev_attr_in3_input.attr,
 583         &dev_attr_in3_min.attr,
 584         &dev_attr_in3_max.attr,
 585         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 586         &dev_attr_in4_input.attr,
 587         &dev_attr_in4_min.attr,
 588         &dev_attr_in4_max.attr,
 589         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 590
 591         &dev_attr_temp1_input.attr,
 592         &dev_attr_temp1_max.attr,
 593         &dev_attr_temp1_min.attr,
 594         &dev_attr_temp1_crit.attr,
 595         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 596         &dev_attr_temp2_input.attr,
 597         &dev_attr_temp2_max.attr,
 598         &dev_attr_temp2_min.attr,
 599         &dev_attr_temp2_crit.attr,
 600         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 601         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 602
 603         &dev_attr_alarms.attr,
 604         &dev_attr_aout_output.attr,
 605
 606         NULL
 607 };
 608
 609 static const struct attribute_group lm87_group = {
 610         .attrs = lm87_attributes,
 611 };
 612
 613 static struct attribute *lm87_attributes_opt[] = {
 614         &dev_attr_in6_input.attr,
 615         &dev_attr_in6_min.attr,
 616         &dev_attr_in6_max.attr,
 617         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 618
 619         &dev_attr_fan1_input.attr,
 620         &dev_attr_fan1_min.attr,
 621         &dev_attr_fan1_div.attr,
 622         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 623
 624         &dev_attr_in7_input.attr,
 625         &dev_attr_in7_min.attr,
 626         &dev_attr_in7_max.attr,
 627         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 628
 629         &dev_attr_fan2_input.attr,
 630         &dev_attr_fan2_min.attr,
 631         &dev_attr_fan2_div.attr,
 632         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 633
 634         &dev_attr_temp3_input.attr,
 635         &dev_attr_temp3_max.attr,
 636         &dev_attr_temp3_min.attr,
 637         &dev_attr_temp3_crit.attr,
 638         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 639         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 640
 641         &dev_attr_in0_input.attr,
 642         &dev_attr_in0_min.attr,
 643         &dev_attr_in0_max.attr,
 644         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 645         &dev_attr_in5_input.attr,
 646         &dev_attr_in5_min.attr,
 647         &dev_attr_in5_max.attr,
 648         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 649
 650         &dev_attr_cpu0_vid.attr,
 651         &dev_attr_vrm.attr,
 652
 653         NULL
 654 };
 655
 656 static const struct attribute_group lm87_group_opt = {
 657         .attrs = lm87_attributes_opt,
 658 };
 659
 660 /* Return 0 if detection is successful, -ENODEV otherwise */
 661 static int lm87_detect(struct i2c_client *new_client,
 662                        struct i2c_board_info *info)
 663 {
 664         struct i2c_adapter *adapter = new_client->adapter;
 665         const char *name;
 666         u8 cid, rev;
 667
 668         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 669                 return -ENODEV;
 670
 671         if (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)
 672                 return -ENODEV;
 673
 674         /* Now, we do the remaining detection. */
 675         cid = lm87_read_value(new_client, LM87_REG_COMPANY_ID);
 676         rev = lm87_read_value(new_client, LM87_REG_REVISION);
 677
 678         if (cid == 0x02                 /* National Semiconductor */
 679          && (rev >= 0x01 && rev <= 0x08))
 680                 name = "lm87";
 681         else if (cid == 0x41            /* Analog Devices */
 682               && (rev & 0xf0) == 0x10)
 683                 name = "adm1024";
 684         else {
 685                 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
 686                         new_client->addr);
 687                 return -ENODEV;
 688         }
 689
 690         strlcpy(info->type, name, I2C_NAME_SIZE);
 691
 692         return 0;
 693 }
 694
 695 static int lm87_probe(struct i2c_client *new_client,
 696                       const struct i2c_device_id *id)
 697 {
 698         struct lm87_data *data;
 699         int err;
 700
 701         data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL);
 702         if (!data) {
 703                 err = -ENOMEM;
 704                 goto exit;
 705         }
 706
 707         i2c_set_clientdata(new_client, data);
 708         data->valid = 0;
 709         mutex_init(&data->update_lock);
 710
 711         /* Initialize the LM87 chip */
 712         lm87_init_client(new_client);
 713
 714         data->in_scale[0] = 2500;
 715         data->in_scale[1] = 2700;
 716         data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
 717         data->in_scale[3] = 5000;
 718         data->in_scale[4] = 12000;
 719         data->in_scale[5] = 2700;
 720         data->in_scale[6] = 1875;
 721         data->in_scale[7] = 1875;
 722
 723         /* Register sysfs hooks */
 724         if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group)))
 725                 goto exit_free;
 726
 727         if (data->channel & CHAN_NO_FAN(0)) {
 728                 if ((err = device_create_file(&new_client->dev,
 729                                         &dev_attr_in6_input))
 730                  || (err = device_create_file(&new_client->dev,
 731                                         &dev_attr_in6_min))
 732                  || (err = device_create_file(&new_client->dev,
 733                                         &dev_attr_in6_max))
 734                  || (err = device_create_file(&new_client->dev,
 735                                         &sensor_dev_attr_in6_alarm.dev_attr)))
 736                         goto exit_remove;
 737         } else {
 738                 if ((err = device_create_file(&new_client->dev,
 739                                         &dev_attr_fan1_input))
 740                  || (err = device_create_file(&new_client->dev,
 741                                         &dev_attr_fan1_min))
 742                  || (err = device_create_file(&new_client->dev,
 743                                         &dev_attr_fan1_div))
 744                  || (err = device_create_file(&new_client->dev,
 745                                         &sensor_dev_attr_fan1_alarm.dev_attr)))
 746                         goto exit_remove;
 747         }
 748
 749         if (data->channel & CHAN_NO_FAN(1)) {
 750                 if ((err = device_create_file(&new_client->dev,
 751                                         &dev_attr_in7_input))
 752                  || (err = device_create_file(&new_client->dev,
 753                                         &dev_attr_in7_min))
 754                  || (err = device_create_file(&new_client->dev,
 755                                         &dev_attr_in7_max))
 756                  || (err = device_create_file(&new_client->dev,
 757                                         &sensor_dev_attr_in7_alarm.dev_attr)))
 758                         goto exit_remove;
 759         } else {
 760                 if ((err = device_create_file(&new_client->dev,
 761                                         &dev_attr_fan2_input))
 762                  || (err = device_create_file(&new_client->dev,
 763                                         &dev_attr_fan2_min))
 764                  || (err = device_create_file(&new_client->dev,
 765                                         &dev_attr_fan2_div))
 766                  || (err = device_create_file(&new_client->dev,
 767                                         &sensor_dev_attr_fan2_alarm.dev_attr)))
 768                         goto exit_remove;
 769         }
 770
 771         if (data->channel & CHAN_TEMP3) {
 772                 if ((err = device_create_file(&new_client->dev,
 773                                         &dev_attr_temp3_input))
 774                  || (err = device_create_file(&new_client->dev,
 775                                         &dev_attr_temp3_max))
 776                  || (err = device_create_file(&new_client->dev,
 777                                         &dev_attr_temp3_min))
 778                  || (err = device_create_file(&new_client->dev,
 779                                         &dev_attr_temp3_crit))
 780                  || (err = device_create_file(&new_client->dev,
 781                                         &sensor_dev_attr_temp3_alarm.dev_attr))
 782                  || (err = device_create_file(&new_client->dev,
 783                                         &sensor_dev_attr_temp3_fault.dev_attr)))
 784                         goto exit_remove;
 785         } else {
 786                 if ((err = device_create_file(&new_client->dev,
 787                                         &dev_attr_in0_input))
 788                  || (err = device_create_file(&new_client->dev,
 789                                         &dev_attr_in0_min))
 790                  || (err = device_create_file(&new_client->dev,
 791                                         &dev_attr_in0_max))
 792                  || (err = device_create_file(&new_client->dev,
 793                                         &sensor_dev_attr_in0_alarm.dev_attr))
 794                  || (err = device_create_file(&new_client->dev,
 795                                         &dev_attr_in5_input))
 796                  || (err = device_create_file(&new_client->dev,
 797                                         &dev_attr_in5_min))
 798                  || (err = device_create_file(&new_client->dev,
 799                                         &dev_attr_in5_max))
 800                  || (err = device_create_file(&new_client->dev,
 801                                         &sensor_dev_attr_in5_alarm.dev_attr)))
 802                         goto exit_remove;
 803         }
 804
 805         if (!(data->channel & CHAN_NO_VID)) {
 806                 data->vrm = vid_which_vrm();
 807                 if ((err = device_create_file(&new_client->dev,
 808                                         &dev_attr_cpu0_vid))
 809                  || (err = device_create_file(&new_client->dev,
 810                                         &dev_attr_vrm)))
 811                         goto exit_remove;
 812         }
 813
 814         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 815         if (IS_ERR(data->hwmon_dev)) {
 816                 err = PTR_ERR(data->hwmon_dev);
 817                 goto exit_remove;
 818         }
 819
 820         return 0;
 821
 822 exit_remove:
 823         sysfs_remove_group(&new_client->dev.kobj, &lm87_group);
 824         sysfs_remove_group(&new_client->dev.kobj, &lm87_group_opt);
 825 exit_free:
 826         lm87_write_value(new_client, LM87_REG_CONFIG, data->config);
 827         kfree(data);
 828 exit:
 829         return err;
 830 }
 831
 832 static void lm87_init_client(struct i2c_client *client)
 833 {
 834         struct lm87_data *data = i2c_get_clientdata(client);
 835
 836         if (client->dev.platform_data) {
 837                 data->channel = *(u8 *)client->dev.platform_data;
 838                 lm87_write_value(client,
 839                                  LM87_REG_CHANNEL_MODE, data->channel);
 840         } else {
 841                 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
 842         }
 843         data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
 844
 845         if (!(data->config & 0x01)) {
 846                 int i;
 847
 848                 /* Limits are left uninitialized after power-up */
 849                 for (i = 1; i < 6; i++) {
 850                         lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
 851                         lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
 852                 }
 853                 for (i = 0; i < 2; i++) {
 854                         lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
 855                         lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
 856                         lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
 857                         lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
 858                 }
 859                 if (data->channel & CHAN_TEMP3) {
 860                         lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
 861                         lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
 862                 } else {
 863                         lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
 864                         lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
 865                 }
 866         }
 867
 868         /* Make sure Start is set and INT#_Clear is clear */
 869         if ((data->config & 0x09) != 0x01)
 870                 lm87_write_value(client, LM87_REG_CONFIG,
 871                                  (data->config & 0x77) | 0x01);
 872 }
 873
 874 static int lm87_remove(struct i2c_client *client)
 875 {
 876         struct lm87_data *data = i2c_get_clientdata(client);
 877
 878         hwmon_device_unregister(data->hwmon_dev);
 879         sysfs_remove_group(&client->dev.kobj, &lm87_group);
 880         sysfs_remove_group(&client->dev.kobj, &lm87_group_opt);
 881
 882         lm87_write_value(client, LM87_REG_CONFIG, data->config);
 883         kfree(data);
 884         return 0;
 885 }
 886
 887 static struct lm87_data *lm87_update_device(struct device *dev)
 888 {
 889         struct i2c_client *client = to_i2c_client(dev);
 890         struct lm87_data *data = i2c_get_clientdata(client);
 891
 892         mutex_lock(&data->update_lock);
 893
 894         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 895                 int i, j;
 896
 897                 dev_dbg(&client->dev, "Updating data.\n");
 898
 899                 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
 900                 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
 901                 for (; i < j; i++) {
 902                         data->in[i] = lm87_read_value(client,
 903                                       LM87_REG_IN(i));
 904                         data->in_min[i] = lm87_read_value(client,
 905                                           LM87_REG_IN_MIN(i));
 906                         data->in_max[i] = lm87_read_value(client,
 907                                           LM87_REG_IN_MAX(i));
 908                 }
 909
 910                 for (i = 0; i < 2; i++) {
 911                         if (data->channel & CHAN_NO_FAN(i)) {
 912                                 data->in[6+i] = lm87_read_value(client,
 913                                                 LM87_REG_AIN(i));
 914                                 data->in_max[6+i] = lm87_read_value(client,
 915                                                     LM87_REG_AIN_MAX(i));
 916                                 data->in_min[6+i] = lm87_read_value(client,
 917                                                     LM87_REG_AIN_MIN(i));
 918
 919                         } else {
 920                                 data->fan[i] = lm87_read_value(client,
 921                                                LM87_REG_FAN(i));
 922                                 data->fan_min[i] = lm87_read_value(client,
 923                                                    LM87_REG_FAN_MIN(i));
 924                         }
 925                 }
 926
 927                 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
 928                 for (i = 0 ; i < j; i++) {
 929                         data->temp[i] = lm87_read_value(client,
 930                                         LM87_REG_TEMP[i]);
 931                         data->temp_high[i] = lm87_read_value(client,
 932                                              LM87_REG_TEMP_HIGH[i]);
 933                         data->temp_low[i] = lm87_read_value(client,
 934                                             LM87_REG_TEMP_LOW[i]);
 935                 }
 936
 937                 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
 938                 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
 939                 data->temp_crit_int = min(i, j);
 940
 941                 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
 942                 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
 943                 data->temp_crit_ext = min(i, j);
 944
 945                 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 946                 data->fan_div[0] = (i >> 4) & 0x03;
 947                 data->fan_div[1] = (i >> 6) & 0x03;
 948                 data->vid = (i & 0x0F)
 949                           | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
 950                              << 4;
 951
 952                 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
 953                              | (lm87_read_value(client, LM87_REG_ALARMS2)
 954                                 << 8);
 955                 data->aout = lm87_read_value(client, LM87_REG_AOUT);
 956
 957                 data->last_updated = jiffies;
 958                 data->valid = 1;
 959         }
 960
 961         mutex_unlock(&data->update_lock);
 962
 963         return data;
 964 }
 965
 966 static int __init sensors_lm87_init(void)
 967 {
 968         return i2c_add_driver(&lm87_driver);
 969 }
 970
 971 static void __exit sensors_lm87_exit(void)
 972 {
 973         i2c_del_driver(&lm87_driver);
 974 }
 975
 976 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others");
 977 MODULE_DESCRIPTION("LM87 driver");
 978 MODULE_LICENSE("GPL");
 979
 980 module_init(sensors_lm87_init);
 981 module_exit(sensors_lm87_exit);