drivers/hwmon/lm80.c

   1 /*
   2  * lm80.c - From lm_sensors, Linux kernel modules for hardware
   3  *          monitoring
   4  * Copyright (C) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
   5  *                           and Philip Edelbrock <phil@netroedge.com>
   6  *
   7  * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/slab.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/i2c.h>
  29 #include <linux/hwmon.h>
  30 #include <linux/hwmon-sysfs.h>
  31 #include <linux/err.h>
  32 #include <linux/mutex.h>
  33
  34 /* Addresses to scan */
  35 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
  36                                                 0x2e, 0x2f, I2C_CLIENT_END };
  37
  38 /* Many LM80 constants specified below */
  39
  40 /* The LM80 registers */
  41 #define LM80_REG_IN_MAX(nr)             (0x2a + (nr) * 2)
  42 #define LM80_REG_IN_MIN(nr)             (0x2b + (nr) * 2)
  43 #define LM80_REG_IN(nr)                 (0x20 + (nr))
  44
  45 #define LM80_REG_FAN1                   0x28
  46 #define LM80_REG_FAN2                   0x29
  47 #define LM80_REG_FAN_MIN(nr)            (0x3b + (nr))
  48
  49 #define LM80_REG_TEMP                   0x27
  50 #define LM80_REG_TEMP_HOT_MAX           0x38
  51 #define LM80_REG_TEMP_HOT_HYST          0x39
  52 #define LM80_REG_TEMP_OS_MAX            0x3a
  53 #define LM80_REG_TEMP_OS_HYST           0x3b
  54
  55 #define LM80_REG_CONFIG                 0x00
  56 #define LM80_REG_ALARM1                 0x01
  57 #define LM80_REG_ALARM2                 0x02
  58 #define LM80_REG_MASK1                  0x03
  59 #define LM80_REG_MASK2                  0x04
  60 #define LM80_REG_FANDIV                 0x05
  61 #define LM80_REG_RES                    0x06
  62
  63 #define LM96080_REG_CONV_RATE           0x07
  64 #define LM96080_REG_MAN_ID              0x3e
  65 #define LM96080_REG_DEV_ID              0x3f
  66
  67
  68 /*
  69  * Conversions. Rounding and limit checking is only done on the TO_REG
  70  * variants. Note that you should be a bit careful with which arguments
  71  * these macros are called: arguments may be evaluated more than once.
  72  * Fixing this is just not worth it.
  73  */
  74
  75 #define IN_TO_REG(val)          (clamp_val(((val) + 5) / 10, 0, 255))
  76 #define IN_FROM_REG(val)        ((val) * 10)
  77
  78 static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
  79 {
  80         if (rpm == 0)
  81                 return 255;
  82         rpm = clamp_val(rpm, 1, 1000000);
  83         return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
  84 }
  85
  86 #define FAN_FROM_REG(val, div)  ((val) == 0 ? -1 : \
  87                                 (val) == 255 ? 0 : 1350000/((div) * (val)))
  88
  89 static inline long TEMP_FROM_REG(u16 temp)
  90 {
  91         long res;
  92
  93         temp >>= 4;
  94         if (temp < 0x0800)
  95                 res = 625 * (long) temp;
  96         else
  97                 res = ((long) temp - 0x01000) * 625;
  98
  99         return res / 10;
 100 }
 101
 102 #define TEMP_LIMIT_FROM_REG(val)        (((val) > 0x80 ? \
 103         (val) - 0x100 : (val)) * 1000)
 104
 105 #define TEMP_LIMIT_TO_REG(val)          clamp_val((val) < 0 ? \
 106         ((val) - 500) / 1000 : ((val) + 500) / 1000, 0, 255)
 107
 108 #define DIV_FROM_REG(val)               (1 << (val))
 109
 110 /*
 111  * Client data (each client gets its own)
 112  */
 113
 114 struct lm80_data {
 115         struct i2c_client *client;
 116         struct mutex update_lock;
 117         char error;             /* !=0 if error occurred during last update */
 118         char valid;             /* !=0 if following fields are valid */
 119         unsigned long last_updated;     /* In jiffies */
 120
 121         u8 in[7];               /* Register value */
 122         u8 in_max[7];           /* Register value */
 123         u8 in_min[7];           /* Register value */
 124         u8 fan[2];              /* Register value */
 125         u8 fan_min[2];          /* Register value */
 126         u8 fan_div[2];          /* Register encoding, shifted right */
 127         u16 temp;               /* Register values, shifted right */
 128         u8 temp_hot_max;        /* Register value */
 129         u8 temp_hot_hyst;       /* Register value */
 130         u8 temp_os_max;         /* Register value */
 131         u8 temp_os_hyst;        /* Register value */
 132         u16 alarms;             /* Register encoding, combined */
 133 };
 134
 135 /*
 136  * Functions declaration
 137  */
 138
 139 static int lm80_probe(struct i2c_client *client,
 140                       const struct i2c_device_id *id);
 141 static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info);
 142 static void lm80_init_client(struct i2c_client *client);
 143 static struct lm80_data *lm80_update_device(struct device *dev);
 144 static int lm80_read_value(struct i2c_client *client, u8 reg);
 145 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
 146
 147 /*
 148  * Driver data (common to all clients)
 149  */
 150
 151 static const struct i2c_device_id lm80_id[] = {
 152         { "lm80", 0 },
 153         { "lm96080", 1 },
 154         { }
 155 };
 156 MODULE_DEVICE_TABLE(i2c, lm80_id);
 157
 158 static struct i2c_driver lm80_driver = {
 159         .class          = I2C_CLASS_HWMON,
 160         .driver = {
 161                 .name   = "lm80",
 162         },
 163         .probe          = lm80_probe,
 164         .id_table       = lm80_id,
 165         .detect         = lm80_detect,
 166         .address_list   = normal_i2c,
 167 };
 168
 169 /*
 170  * Sysfs stuff
 171  */
 172
 173 #define show_in(suffix, value) \
 174 static ssize_t show_in_##suffix(struct device *dev, \
 175         struct device_attribute *attr, char *buf) \
 176 { \
 177         int nr = to_sensor_dev_attr(attr)->index; \
 178         struct lm80_data *data = lm80_update_device(dev); \
 179         if (IS_ERR(data)) \
 180                 return PTR_ERR(data); \
 181         return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
 182 }
 183 show_in(min, in_min)
 184 show_in(max, in_max)
 185 show_in(input, in)
 186
 187 #define set_in(suffix, value, reg) \
 188 static ssize_t set_in_##suffix(struct device *dev, \
 189         struct device_attribute *attr, const char *buf, size_t count) \
 190 { \
 191         int nr = to_sensor_dev_attr(attr)->index; \
 192         struct lm80_data *data = dev_get_drvdata(dev); \
 193         struct i2c_client *client = data->client; \
 194         long val; \
 195         int err = kstrtol(buf, 10, &val); \
 196         if (err < 0) \
 197                 return err; \
 198 \
 199         mutex_lock(&data->update_lock);\
 200         data->value[nr] = IN_TO_REG(val); \
 201         lm80_write_value(client, reg(nr), data->value[nr]); \
 202         mutex_unlock(&data->update_lock);\
 203         return count; \
 204 }
 205 set_in(min, in_min, LM80_REG_IN_MIN)
 206 set_in(max, in_max, LM80_REG_IN_MAX)
 207
 208 #define show_fan(suffix, value) \
 209 static ssize_t show_fan_##suffix(struct device *dev, \
 210         struct device_attribute *attr, char *buf) \
 211 { \
 212         int nr = to_sensor_dev_attr(attr)->index; \
 213         struct lm80_data *data = lm80_update_device(dev); \
 214         if (IS_ERR(data)) \
 215                 return PTR_ERR(data); \
 216         return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
 217                        DIV_FROM_REG(data->fan_div[nr]))); \
 218 }
 219 show_fan(min, fan_min)
 220 show_fan(input, fan)
 221
 222 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 223         char *buf)
 224 {
 225         int nr = to_sensor_dev_attr(attr)->index;
 226         struct lm80_data *data = lm80_update_device(dev);
 227         if (IS_ERR(data))
 228                 return PTR_ERR(data);
 229         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 230 }
 231
 232 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 233         const char *buf, size_t count)
 234 {
 235         int nr = to_sensor_dev_attr(attr)->index;
 236         struct lm80_data *data = dev_get_drvdata(dev);
 237         struct i2c_client *client = data->client;
 238         unsigned long val;
 239         int err = kstrtoul(buf, 10, &val);
 240         if (err < 0)
 241                 return err;
 242
 243         mutex_lock(&data->update_lock);
 244         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 245         lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
 246         mutex_unlock(&data->update_lock);
 247         return count;
 248 }
 249
 250 /*
 251  * Note: we save and restore the fan minimum here, because its value is
 252  * determined in part by the fan divisor.  This follows the principle of
 253  * least surprise; the user doesn't expect the fan minimum to change just
 254  * because the divisor changed.
 255  */
 256 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 257         const char *buf, size_t count)
 258 {
 259         int nr = to_sensor_dev_attr(attr)->index;
 260         struct lm80_data *data = dev_get_drvdata(dev);
 261         struct i2c_client *client = data->client;
 262         unsigned long min, val;
 263         u8 reg;
 264         int err = kstrtoul(buf, 10, &val);
 265         if (err < 0)
 266                 return err;
 267
 268         /* Save fan_min */
 269         mutex_lock(&data->update_lock);
 270         min = FAN_FROM_REG(data->fan_min[nr],
 271                            DIV_FROM_REG(data->fan_div[nr]));
 272
 273         switch (val) {
 274         case 1:
 275                 data->fan_div[nr] = 0;
 276                 break;
 277         case 2:
 278                 data->fan_div[nr] = 1;
 279                 break;
 280         case 4:
 281                 data->fan_div[nr] = 2;
 282                 break;
 283         case 8:
 284                 data->fan_div[nr] = 3;
 285                 break;
 286         default:
 287                 dev_err(dev,
 288                         "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
 289                         val);
 290                 mutex_unlock(&data->update_lock);
 291                 return -EINVAL;
 292         }
 293
 294         reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
 295             | (data->fan_div[nr] << (2 * (nr + 1)));
 296         lm80_write_value(client, LM80_REG_FANDIV, reg);
 297
 298         /* Restore fan_min */
 299         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 300         lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
 301         mutex_unlock(&data->update_lock);
 302
 303         return count;
 304 }
 305
 306 static ssize_t show_temp_input1(struct device *dev,
 307         struct device_attribute *attr, char *buf)
 308 {
 309         struct lm80_data *data = lm80_update_device(dev);
 310         if (IS_ERR(data))
 311                 return PTR_ERR(data);
 312         return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
 313 }
 314
 315 #define show_temp(suffix, value) \
 316 static ssize_t show_temp_##suffix(struct device *dev, \
 317         struct device_attribute *attr, char *buf) \
 318 { \
 319         struct lm80_data *data = lm80_update_device(dev); \
 320         if (IS_ERR(data)) \
 321                 return PTR_ERR(data); \
 322         return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
 323 }
 324 show_temp(hot_max, temp_hot_max);
 325 show_temp(hot_hyst, temp_hot_hyst);
 326 show_temp(os_max, temp_os_max);
 327 show_temp(os_hyst, temp_os_hyst);
 328
 329 #define set_temp(suffix, value, reg) \
 330 static ssize_t set_temp_##suffix(struct device *dev, \
 331         struct device_attribute *attr, const char *buf, size_t count) \
 332 { \
 333         struct lm80_data *data = dev_get_drvdata(dev); \
 334         struct i2c_client *client = data->client; \
 335         long val; \
 336         int err = kstrtol(buf, 10, &val); \
 337         if (err < 0) \
 338                 return err; \
 339 \
 340         mutex_lock(&data->update_lock); \
 341         data->value = TEMP_LIMIT_TO_REG(val); \
 342         lm80_write_value(client, reg, data->value); \
 343         mutex_unlock(&data->update_lock); \
 344         return count; \
 345 }
 346 set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
 347 set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
 348 set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
 349 set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
 350
 351 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
 352                            char *buf)
 353 {
 354         struct lm80_data *data = lm80_update_device(dev);
 355         if (IS_ERR(data))
 356                 return PTR_ERR(data);
 357         return sprintf(buf, "%u\n", data->alarms);
 358 }
 359
 360 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 361                           char *buf)
 362 {
 363         int bitnr = to_sensor_dev_attr(attr)->index;
 364         struct lm80_data *data = lm80_update_device(dev);
 365         if (IS_ERR(data))
 366                 return PTR_ERR(data);
 367         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 368 }
 369
 370 static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO,
 371                 show_in_min, set_in_min, 0);
 372 static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO,
 373                 show_in_min, set_in_min, 1);
 374 static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO,
 375                 show_in_min, set_in_min, 2);
 376 static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO,
 377                 show_in_min, set_in_min, 3);
 378 static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO,
 379                 show_in_min, set_in_min, 4);
 380 static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO,
 381                 show_in_min, set_in_min, 5);
 382 static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO,
 383                 show_in_min, set_in_min, 6);
 384 static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO,
 385                 show_in_max, set_in_max, 0);
 386 static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO,
 387                 show_in_max, set_in_max, 1);
 388 static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO,
 389                 show_in_max, set_in_max, 2);
 390 static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO,
 391                 show_in_max, set_in_max, 3);
 392 static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO,
 393                 show_in_max, set_in_max, 4);
 394 static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO,
 395                 show_in_max, set_in_max, 5);
 396 static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO,
 397                 show_in_max, set_in_max, 6);
 398 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0);
 399 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1);
 400 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2);
 401 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3);
 402 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4);
 403 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5);
 404 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6);
 405 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO,
 406                 show_fan_min, set_fan_min, 0);
 407 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO,
 408                 show_fan_min, set_fan_min, 1);
 409 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
 410 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
 411 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
 412                 show_fan_div, set_fan_div, 0);
 413 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
 414                 show_fan_div, set_fan_div, 1);
 415 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
 416 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
 417         set_temp_hot_max);
 418 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
 419         set_temp_hot_hyst);
 420 static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
 421         set_temp_os_max);
 422 static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
 423         set_temp_os_hyst);
 424 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 425 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 426 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 427 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 428 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 429 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
 430 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
 431 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
 432 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
 433 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
 434 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
 435 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
 436
 437 /*
 438  * Real code
 439  */
 440
 441 static struct attribute *lm80_attrs[] = {
 442         &sensor_dev_attr_in0_min.dev_attr.attr,
 443         &sensor_dev_attr_in1_min.dev_attr.attr,
 444         &sensor_dev_attr_in2_min.dev_attr.attr,
 445         &sensor_dev_attr_in3_min.dev_attr.attr,
 446         &sensor_dev_attr_in4_min.dev_attr.attr,
 447         &sensor_dev_attr_in5_min.dev_attr.attr,
 448         &sensor_dev_attr_in6_min.dev_attr.attr,
 449         &sensor_dev_attr_in0_max.dev_attr.attr,
 450         &sensor_dev_attr_in1_max.dev_attr.attr,
 451         &sensor_dev_attr_in2_max.dev_attr.attr,
 452         &sensor_dev_attr_in3_max.dev_attr.attr,
 453         &sensor_dev_attr_in4_max.dev_attr.attr,
 454         &sensor_dev_attr_in5_max.dev_attr.attr,
 455         &sensor_dev_attr_in6_max.dev_attr.attr,
 456         &sensor_dev_attr_in0_input.dev_attr.attr,
 457         &sensor_dev_attr_in1_input.dev_attr.attr,
 458         &sensor_dev_attr_in2_input.dev_attr.attr,
 459         &sensor_dev_attr_in3_input.dev_attr.attr,
 460         &sensor_dev_attr_in4_input.dev_attr.attr,
 461         &sensor_dev_attr_in5_input.dev_attr.attr,
 462         &sensor_dev_attr_in6_input.dev_attr.attr,
 463         &sensor_dev_attr_fan1_min.dev_attr.attr,
 464         &sensor_dev_attr_fan2_min.dev_attr.attr,
 465         &sensor_dev_attr_fan1_input.dev_attr.attr,
 466         &sensor_dev_attr_fan2_input.dev_attr.attr,
 467         &sensor_dev_attr_fan1_div.dev_attr.attr,
 468         &sensor_dev_attr_fan2_div.dev_attr.attr,
 469         &dev_attr_temp1_input.attr,
 470         &dev_attr_temp1_max.attr,
 471         &dev_attr_temp1_max_hyst.attr,
 472         &dev_attr_temp1_crit.attr,
 473         &dev_attr_temp1_crit_hyst.attr,
 474         &dev_attr_alarms.attr,
 475         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 476         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 477         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 478         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 479         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 480         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 481         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 482         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 483         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 484         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 485         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 486         NULL
 487 };
 488 ATTRIBUTE_GROUPS(lm80);
 489
 490 /* Return 0 if detection is successful, -ENODEV otherwise */
 491 static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
 492 {
 493         struct i2c_adapter *adapter = client->adapter;
 494         int i, cur, man_id, dev_id;
 495         const char *name = NULL;
 496
 497         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 498                 return -ENODEV;
 499
 500         /* First check for unused bits, common to both chip types */
 501         if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
 502          || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80))
 503                 return -ENODEV;
 504
 505         /*
 506          * The LM96080 has manufacturer and stepping/die rev registers so we
 507          * can just check that. The LM80 does not have such registers so we
 508          * have to use a more expensive trick.
 509          */
 510         man_id = lm80_read_value(client, LM96080_REG_MAN_ID);
 511         dev_id = lm80_read_value(client, LM96080_REG_DEV_ID);
 512         if (man_id == 0x01 && dev_id == 0x08) {
 513                 /* Check more unused bits for confirmation */
 514                 if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe)
 515                         return -ENODEV;
 516
 517                 name = "lm96080";
 518         } else {
 519                 /* Check 6-bit addressing */
 520                 for (i = 0x2a; i <= 0x3d; i++) {
 521                         cur = i2c_smbus_read_byte_data(client, i);
 522                         if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
 523                          || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
 524                          || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
 525                                 return -ENODEV;
 526                 }
 527
 528                 name = "lm80";
 529         }
 530
 531         strlcpy(info->type, name, I2C_NAME_SIZE);
 532
 533         return 0;
 534 }
 535
 536 static int lm80_probe(struct i2c_client *client,
 537                       const struct i2c_device_id *id)
 538 {
 539         struct device *dev = &client->dev;
 540         struct device *hwmon_dev;
 541         struct lm80_data *data;
 542
 543         data = devm_kzalloc(dev, sizeof(struct lm80_data), GFP_KERNEL);
 544         if (!data)
 545                 return -ENOMEM;
 546
 547         data->client = client;
 548         mutex_init(&data->update_lock);
 549
 550         /* Initialize the LM80 chip */
 551         lm80_init_client(client);
 552
 553         /* A few vars need to be filled upon startup */
 554         data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
 555         data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
 556
 557         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 558                                                            data, lm80_groups);
 559
 560         return PTR_ERR_OR_ZERO(hwmon_dev);
 561 }
 562
 563 static int lm80_read_value(struct i2c_client *client, u8 reg)
 564 {
 565         return i2c_smbus_read_byte_data(client, reg);
 566 }
 567
 568 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
 569 {
 570         return i2c_smbus_write_byte_data(client, reg, value);
 571 }
 572
 573 /* Called when we have found a new LM80. */
 574 static void lm80_init_client(struct i2c_client *client)
 575 {
 576         /*
 577          * Reset all except Watchdog values and last conversion values
 578          * This sets fan-divs to 2, among others. This makes most other
 579          * initializations unnecessary
 580          */
 581         lm80_write_value(client, LM80_REG_CONFIG, 0x80);
 582         /* Set 11-bit temperature resolution */
 583         lm80_write_value(client, LM80_REG_RES, 0x08);
 584
 585         /* Start monitoring */
 586         lm80_write_value(client, LM80_REG_CONFIG, 0x01);
 587 }
 588
 589 static struct lm80_data *lm80_update_device(struct device *dev)
 590 {
 591         struct lm80_data *data = dev_get_drvdata(dev);
 592         struct i2c_client *client = data->client;
 593         int i;
 594         int rv;
 595         int prev_rv;
 596         struct lm80_data *ret = data;
 597
 598         mutex_lock(&data->update_lock);
 599
 600         if (data->error)
 601                 lm80_init_client(client);
 602
 603         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 604                 dev_dbg(dev, "Starting lm80 update\n");
 605                 for (i = 0; i <= 6; i++) {
 606                         rv = lm80_read_value(client, LM80_REG_IN(i));
 607                         if (rv < 0)
 608                                 goto abort;
 609                         data->in[i] = rv;
 610
 611                         rv = lm80_read_value(client, LM80_REG_IN_MIN(i));
 612                         if (rv < 0)
 613                                 goto abort;
 614                         data->in_min[i] = rv;
 615
 616                         rv = lm80_read_value(client, LM80_REG_IN_MAX(i));
 617                         if (rv < 0)
 618                                 goto abort;
 619                         data->in_max[i] = rv;
 620                 }
 621
 622                 rv = lm80_read_value(client, LM80_REG_FAN1);
 623                 if (rv < 0)
 624                         goto abort;
 625                 data->fan[0] = rv;
 626
 627                 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
 628                 if (rv < 0)
 629                         goto abort;
 630                 data->fan_min[0] = rv;
 631
 632                 rv = lm80_read_value(client, LM80_REG_FAN2);
 633                 if (rv < 0)
 634                         goto abort;
 635                 data->fan[1] = rv;
 636
 637                 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
 638                 if (rv < 0)
 639                         goto abort;
 640                 data->fan_min[1] = rv;
 641
 642                 prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP);
 643                 if (rv < 0)
 644                         goto abort;
 645                 rv = lm80_read_value(client, LM80_REG_RES);
 646                 if (rv < 0)
 647                         goto abort;
 648                 data->temp = (prev_rv << 8) | (rv & 0xf0);
 649
 650                 rv = lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
 651                 if (rv < 0)
 652                         goto abort;
 653                 data->temp_os_max = rv;
 654
 655                 rv = lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
 656                 if (rv < 0)
 657                         goto abort;
 658                 data->temp_os_hyst = rv;
 659
 660                 rv = lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
 661                 if (rv < 0)
 662                         goto abort;
 663                 data->temp_hot_max = rv;
 664
 665                 rv = lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
 666                 if (rv < 0)
 667                         goto abort;
 668                 data->temp_hot_hyst = rv;
 669
 670                 rv = lm80_read_value(client, LM80_REG_FANDIV);
 671                 if (rv < 0)
 672                         goto abort;
 673                 data->fan_div[0] = (rv >> 2) & 0x03;
 674                 data->fan_div[1] = (rv >> 4) & 0x03;
 675
 676                 prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1);
 677                 if (rv < 0)
 678                         goto abort;
 679                 rv = lm80_read_value(client, LM80_REG_ALARM2);
 680                 if (rv < 0)
 681                         goto abort;
 682                 data->alarms = prev_rv + (rv << 8);
 683
 684                 data->last_updated = jiffies;
 685                 data->valid = 1;
 686                 data->error = 0;
 687         }
 688         goto done;
 689
 690 abort:
 691         ret = ERR_PTR(rv);
 692         data->valid = 0;
 693         data->error = 1;
 694
 695 done:
 696         mutex_unlock(&data->update_lock);
 697
 698         return ret;
 699 }
 700
 701 module_i2c_driver(lm80_driver);
 702
 703 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
 704         "Philip Edelbrock <phil@netroedge.com>");
 705 MODULE_DESCRIPTION("LM80 driver");
 706 MODULE_LICENSE("GPL");