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
  64 /* Conversions. Rounding and limit checking is only done on the TO_REG
  65    variants. Note that you should be a bit careful with which arguments
  66    these macros are called: arguments may be evaluated more than once.
  67    Fixing this is just not worth it. */
  68
  69 #define IN_TO_REG(val)          (SENSORS_LIMIT(((val) + 5) / 10, 0, 255))
  70 #define IN_FROM_REG(val)        ((val) * 10)
  71
  72 static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
  73 {
  74         if (rpm == 0)
  75                 return 255;
  76         rpm = SENSORS_LIMIT(rpm, 1, 1000000);
  77         return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
  78 }
  79
  80 #define FAN_FROM_REG(val, div)  ((val) == 0 ? -1 : \
  81                                 (val) == 255 ? 0 : 1350000/((div) * (val)))
  82
  83 static inline long TEMP_FROM_REG(u16 temp)
  84 {
  85         long res;
  86
  87         temp >>= 4;
  88         if (temp < 0x0800)
  89                 res = 625 * (long) temp;
  90         else
  91                 res = ((long) temp - 0x01000) * 625;
  92
  93         return res / 10;
  94 }
  95
  96 #define TEMP_LIMIT_FROM_REG(val)        (((val) > 0x80 ? \
  97         (val) - 0x100 : (val)) * 1000)
  98
  99 #define TEMP_LIMIT_TO_REG(val)          SENSORS_LIMIT((val) < 0 ? \
 100         ((val) - 500) / 1000 : ((val) + 500) / 1000, 0, 255)
 101
 102 #define DIV_FROM_REG(val)               (1 << (val))
 103
 104 /*
 105  * Client data (each client gets its own)
 106  */
 107
 108 struct lm80_data {
 109         struct device *hwmon_dev;
 110         struct mutex update_lock;
 111         char error;             /* !=0 if error occurred during last update */
 112         char valid;             /* !=0 if following fields are valid */
 113         unsigned long last_updated;     /* In jiffies */
 114
 115         u8 in[7];               /* Register value */
 116         u8 in_max[7];           /* Register value */
 117         u8 in_min[7];           /* Register value */
 118         u8 fan[2];              /* Register value */
 119         u8 fan_min[2];          /* Register value */
 120         u8 fan_div[2];          /* Register encoding, shifted right */
 121         u16 temp;               /* Register values, shifted right */
 122         u8 temp_hot_max;        /* Register value */
 123         u8 temp_hot_hyst;       /* Register value */
 124         u8 temp_os_max;         /* Register value */
 125         u8 temp_os_hyst;        /* Register value */
 126         u16 alarms;             /* Register encoding, combined */
 127 };
 128
 129 /*
 130  * Functions declaration
 131  */
 132
 133 static int lm80_probe(struct i2c_client *client,
 134                       const struct i2c_device_id *id);
 135 static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info);
 136 static void lm80_init_client(struct i2c_client *client);
 137 static int lm80_remove(struct i2c_client *client);
 138 static struct lm80_data *lm80_update_device(struct device *dev);
 139 static int lm80_read_value(struct i2c_client *client, u8 reg);
 140 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
 141
 142 /*
 143  * Driver data (common to all clients)
 144  */
 145
 146 static const struct i2c_device_id lm80_id[] = {
 147         { "lm80", 0 },
 148         { }
 149 };
 150 MODULE_DEVICE_TABLE(i2c, lm80_id);
 151
 152 static struct i2c_driver lm80_driver = {
 153         .class          = I2C_CLASS_HWMON,
 154         .driver = {
 155                 .name   = "lm80",
 156         },
 157         .probe          = lm80_probe,
 158         .remove         = lm80_remove,
 159         .id_table       = lm80_id,
 160         .detect         = lm80_detect,
 161         .address_list   = normal_i2c,
 162 };
 163
 164 /*
 165  * Sysfs stuff
 166  */
 167
 168 #define show_in(suffix, value) \
 169 static ssize_t show_in_##suffix(struct device *dev, \
 170         struct device_attribute *attr, char *buf) \
 171 { \
 172         int nr = to_sensor_dev_attr(attr)->index; \
 173         struct lm80_data *data = lm80_update_device(dev); \
 174         if (IS_ERR(data)) \
 175                 return PTR_ERR(data); \
 176         return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
 177 }
 178 show_in(min, in_min)
 179 show_in(max, in_max)
 180 show_in(input, in)
 181
 182 #define set_in(suffix, value, reg) \
 183 static ssize_t set_in_##suffix(struct device *dev, \
 184         struct device_attribute *attr, const char *buf, size_t count) \
 185 { \
 186         int nr = to_sensor_dev_attr(attr)->index; \
 187         struct i2c_client *client = to_i2c_client(dev); \
 188         struct lm80_data *data = i2c_get_clientdata(client); \
 189         long val; \
 190         int err = kstrtol(buf, 10, &val); \
 191         if (err < 0) \
 192                 return err; \
 193 \
 194         mutex_lock(&data->update_lock);\
 195         data->value[nr] = IN_TO_REG(val); \
 196         lm80_write_value(client, reg(nr), data->value[nr]); \
 197         mutex_unlock(&data->update_lock);\
 198         return count; \
 199 }
 200 set_in(min, in_min, LM80_REG_IN_MIN)
 201 set_in(max, in_max, LM80_REG_IN_MAX)
 202
 203 #define show_fan(suffix, value) \
 204 static ssize_t show_fan_##suffix(struct device *dev, \
 205         struct device_attribute *attr, char *buf) \
 206 { \
 207         int nr = to_sensor_dev_attr(attr)->index; \
 208         struct lm80_data *data = lm80_update_device(dev); \
 209         if (IS_ERR(data)) \
 210                 return PTR_ERR(data); \
 211         return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
 212                        DIV_FROM_REG(data->fan_div[nr]))); \
 213 }
 214 show_fan(min, fan_min)
 215 show_fan(input, fan)
 216
 217 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 218         char *buf)
 219 {
 220         int nr = to_sensor_dev_attr(attr)->index;
 221         struct lm80_data *data = lm80_update_device(dev);
 222         if (IS_ERR(data))
 223                 return PTR_ERR(data);
 224         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 225 }
 226
 227 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 228         const char *buf, size_t count)
 229 {
 230         int nr = to_sensor_dev_attr(attr)->index;
 231         struct i2c_client *client = to_i2c_client(dev);
 232         struct lm80_data *data = i2c_get_clientdata(client);
 233         unsigned long val;
 234         int err = kstrtoul(buf, 10, &val);
 235         if (err < 0)
 236                 return err;
 237
 238         mutex_lock(&data->update_lock);
 239         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 240         lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
 241         mutex_unlock(&data->update_lock);
 242         return count;
 243 }
 244
 245 /* Note: we save and restore the fan minimum here, because its value is
 246    determined in part by the fan divisor.  This follows the principle of
 247    least surprise; the user doesn't expect the fan minimum to change just
 248    because the divisor changed. */
 249 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 250         const char *buf, size_t count)
 251 {
 252         int nr = to_sensor_dev_attr(attr)->index;
 253         struct i2c_client *client = to_i2c_client(dev);
 254         struct lm80_data *data = i2c_get_clientdata(client);
 255         unsigned long min, val;
 256         u8 reg;
 257         int err = kstrtoul(buf, 10, &val);
 258         if (err < 0)
 259                 return err;
 260
 261         /* Save fan_min */
 262         mutex_lock(&data->update_lock);
 263         min = FAN_FROM_REG(data->fan_min[nr],
 264                            DIV_FROM_REG(data->fan_div[nr]));
 265
 266         switch (val) {
 267         case 1:
 268                 data->fan_div[nr] = 0;
 269                 break;
 270         case 2:
 271                 data->fan_div[nr] = 1;
 272                 break;
 273         case 4:
 274                 data->fan_div[nr] = 2;
 275                 break;
 276         case 8:
 277                 data->fan_div[nr] = 3;
 278                 break;
 279         default:
 280                 dev_err(&client->dev, "fan_div value %ld not "
 281                         "supported. Choose one of 1, 2, 4 or 8!\n", val);
 282                 mutex_unlock(&data->update_lock);
 283                 return -EINVAL;
 284         }
 285
 286         reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
 287             | (data->fan_div[nr] << (2 * (nr + 1)));
 288         lm80_write_value(client, LM80_REG_FANDIV, reg);
 289
 290         /* Restore fan_min */
 291         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 292         lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
 293         mutex_unlock(&data->update_lock);
 294
 295         return count;
 296 }
 297
 298 static ssize_t show_temp_input1(struct device *dev,
 299         struct device_attribute *attr, char *buf)
 300 {
 301         struct lm80_data *data = lm80_update_device(dev);
 302         if (IS_ERR(data))
 303                 return PTR_ERR(data);
 304         return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
 305 }
 306
 307 #define show_temp(suffix, value) \
 308 static ssize_t show_temp_##suffix(struct device *dev, \
 309         struct device_attribute *attr, char *buf) \
 310 { \
 311         struct lm80_data *data = lm80_update_device(dev); \
 312         if (IS_ERR(data)) \
 313                 return PTR_ERR(data); \
 314         return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
 315 }
 316 show_temp(hot_max, temp_hot_max);
 317 show_temp(hot_hyst, temp_hot_hyst);
 318 show_temp(os_max, temp_os_max);
 319 show_temp(os_hyst, temp_os_hyst);
 320
 321 #define set_temp(suffix, value, reg) \
 322 static ssize_t set_temp_##suffix(struct device *dev, \
 323         struct device_attribute *attr, const char *buf, size_t count) \
 324 { \
 325         struct i2c_client *client = to_i2c_client(dev); \
 326         struct lm80_data *data = i2c_get_clientdata(client); \
 327         long val; \
 328         int err = kstrtol(buf, 10, &val); \
 329         if (err < 0) \
 330                 return err; \
 331 \
 332         mutex_lock(&data->update_lock); \
 333         data->value = TEMP_LIMIT_TO_REG(val); \
 334         lm80_write_value(client, reg, data->value); \
 335         mutex_unlock(&data->update_lock); \
 336         return count; \
 337 }
 338 set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
 339 set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
 340 set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
 341 set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
 342
 343 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
 344                            char *buf)
 345 {
 346         struct lm80_data *data = lm80_update_device(dev);
 347         if (IS_ERR(data))
 348                 return PTR_ERR(data);
 349         return sprintf(buf, "%u\n", data->alarms);
 350 }
 351
 352 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 353                           char *buf)
 354 {
 355         int bitnr = to_sensor_dev_attr(attr)->index;
 356         struct lm80_data *data = lm80_update_device(dev);
 357         if (IS_ERR(data))
 358                 return PTR_ERR(data);
 359         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 360 }
 361
 362 static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO,
 363                 show_in_min, set_in_min, 0);
 364 static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO,
 365                 show_in_min, set_in_min, 1);
 366 static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO,
 367                 show_in_min, set_in_min, 2);
 368 static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO,
 369                 show_in_min, set_in_min, 3);
 370 static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO,
 371                 show_in_min, set_in_min, 4);
 372 static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO,
 373                 show_in_min, set_in_min, 5);
 374 static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO,
 375                 show_in_min, set_in_min, 6);
 376 static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO,
 377                 show_in_max, set_in_max, 0);
 378 static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO,
 379                 show_in_max, set_in_max, 1);
 380 static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO,
 381                 show_in_max, set_in_max, 2);
 382 static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO,
 383                 show_in_max, set_in_max, 3);
 384 static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO,
 385                 show_in_max, set_in_max, 4);
 386 static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO,
 387                 show_in_max, set_in_max, 5);
 388 static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO,
 389                 show_in_max, set_in_max, 6);
 390 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0);
 391 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1);
 392 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2);
 393 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3);
 394 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4);
 395 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5);
 396 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6);
 397 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO,
 398                 show_fan_min, set_fan_min, 0);
 399 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO,
 400                 show_fan_min, set_fan_min, 1);
 401 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
 402 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
 403 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
 404                 show_fan_div, set_fan_div, 0);
 405 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
 406                 show_fan_div, set_fan_div, 1);
 407 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
 408 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
 409         set_temp_hot_max);
 410 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
 411         set_temp_hot_hyst);
 412 static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
 413         set_temp_os_max);
 414 static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
 415         set_temp_os_hyst);
 416 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 417 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 418 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 419 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 420 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 421 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
 422 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
 423 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
 424 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
 425 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
 426 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
 427 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
 428
 429 /*
 430  * Real code
 431  */
 432
 433 static struct attribute *lm80_attributes[] = {
 434         &sensor_dev_attr_in0_min.dev_attr.attr,
 435         &sensor_dev_attr_in1_min.dev_attr.attr,
 436         &sensor_dev_attr_in2_min.dev_attr.attr,
 437         &sensor_dev_attr_in3_min.dev_attr.attr,
 438         &sensor_dev_attr_in4_min.dev_attr.attr,
 439         &sensor_dev_attr_in5_min.dev_attr.attr,
 440         &sensor_dev_attr_in6_min.dev_attr.attr,
 441         &sensor_dev_attr_in0_max.dev_attr.attr,
 442         &sensor_dev_attr_in1_max.dev_attr.attr,
 443         &sensor_dev_attr_in2_max.dev_attr.attr,
 444         &sensor_dev_attr_in3_max.dev_attr.attr,
 445         &sensor_dev_attr_in4_max.dev_attr.attr,
 446         &sensor_dev_attr_in5_max.dev_attr.attr,
 447         &sensor_dev_attr_in6_max.dev_attr.attr,
 448         &sensor_dev_attr_in0_input.dev_attr.attr,
 449         &sensor_dev_attr_in1_input.dev_attr.attr,
 450         &sensor_dev_attr_in2_input.dev_attr.attr,
 451         &sensor_dev_attr_in3_input.dev_attr.attr,
 452         &sensor_dev_attr_in4_input.dev_attr.attr,
 453         &sensor_dev_attr_in5_input.dev_attr.attr,
 454         &sensor_dev_attr_in6_input.dev_attr.attr,
 455         &sensor_dev_attr_fan1_min.dev_attr.attr,
 456         &sensor_dev_attr_fan2_min.dev_attr.attr,
 457         &sensor_dev_attr_fan1_input.dev_attr.attr,
 458         &sensor_dev_attr_fan2_input.dev_attr.attr,
 459         &sensor_dev_attr_fan1_div.dev_attr.attr,
 460         &sensor_dev_attr_fan2_div.dev_attr.attr,
 461         &dev_attr_temp1_input.attr,
 462         &dev_attr_temp1_max.attr,
 463         &dev_attr_temp1_max_hyst.attr,
 464         &dev_attr_temp1_crit.attr,
 465         &dev_attr_temp1_crit_hyst.attr,
 466         &dev_attr_alarms.attr,
 467         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 468         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 469         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 470         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 471         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 472         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 473         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 474         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 475         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 476         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 477         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 478         NULL
 479 };
 480
 481 static const struct attribute_group lm80_group = {
 482         .attrs = lm80_attributes,
 483 };
 484
 485 /* Return 0 if detection is successful, -ENODEV otherwise */
 486 static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
 487 {
 488         struct i2c_adapter *adapter = client->adapter;
 489         int i, cur;
 490
 491         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 492                 return -ENODEV;
 493
 494         /* Now, we do the remaining detection. It is lousy. */
 495         if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
 496                 return -ENODEV;
 497         for (i = 0x2a; i <= 0x3d; i++) {
 498                 cur = i2c_smbus_read_byte_data(client, i);
 499                 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
 500                  || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
 501                  || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
 502                         return -ENODEV;
 503         }
 504
 505         strlcpy(info->type, "lm80", I2C_NAME_SIZE);
 506
 507         return 0;
 508 }
 509
 510 static int lm80_probe(struct i2c_client *client,
 511                       const struct i2c_device_id *id)
 512 {
 513         struct lm80_data *data;
 514         int err;
 515
 516         data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL);
 517         if (!data) {
 518                 err = -ENOMEM;
 519                 goto exit;
 520         }
 521
 522         i2c_set_clientdata(client, data);
 523         mutex_init(&data->update_lock);
 524
 525         /* Initialize the LM80 chip */
 526         lm80_init_client(client);
 527
 528         /* A few vars need to be filled upon startup */
 529         data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
 530         data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
 531
 532         /* Register sysfs hooks */
 533         err = sysfs_create_group(&client->dev.kobj, &lm80_group);
 534         if (err)
 535                 goto error_free;
 536
 537         data->hwmon_dev = hwmon_device_register(&client->dev);
 538         if (IS_ERR(data->hwmon_dev)) {
 539                 err = PTR_ERR(data->hwmon_dev);
 540                 goto error_remove;
 541         }
 542
 543         return 0;
 544
 545 error_remove:
 546         sysfs_remove_group(&client->dev.kobj, &lm80_group);
 547 error_free:
 548         kfree(data);
 549 exit:
 550         return err;
 551 }
 552
 553 static int lm80_remove(struct i2c_client *client)
 554 {
 555         struct lm80_data *data = i2c_get_clientdata(client);
 556
 557         hwmon_device_unregister(data->hwmon_dev);
 558         sysfs_remove_group(&client->dev.kobj, &lm80_group);
 559
 560         kfree(data);
 561         return 0;
 562 }
 563
 564 static int lm80_read_value(struct i2c_client *client, u8 reg)
 565 {
 566         return i2c_smbus_read_byte_data(client, reg);
 567 }
 568
 569 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
 570 {
 571         return i2c_smbus_write_byte_data(client, reg, value);
 572 }
 573
 574 /* Called when we have found a new LM80. */
 575 static void lm80_init_client(struct i2c_client *client)
 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         lm80_write_value(client, LM80_REG_CONFIG, 0x80);
 581         /* Set 11-bit temperature resolution */
 582         lm80_write_value(client, LM80_REG_RES, 0x08);
 583
 584         /* Start monitoring */
 585         lm80_write_value(client, LM80_REG_CONFIG, 0x01);
 586 }
 587
 588 static struct lm80_data *lm80_update_device(struct device *dev)
 589 {
 590         struct i2c_client *client = to_i2c_client(dev);
 591         struct lm80_data *data = i2c_get_clientdata(client);
 592         int i;
 593         int rv;
 594         int prev_rv;
 595         struct lm80_data *ret = data;
 596
 597         mutex_lock(&data->update_lock);
 598
 599         if (data->error)
 600                 lm80_init_client(client);
 601
 602         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 603                 dev_dbg(&client->dev, "Starting lm80 update\n");
 604                 for (i = 0; i <= 6; i++) {
 605                         rv = lm80_read_value(client, LM80_REG_IN(i));
 606                         if (rv < 0)
 607                                 goto abort;
 608                         data->in[i] = rv;
 609
 610                         rv = lm80_read_value(client, LM80_REG_IN_MIN(i));
 611                         if (rv < 0)
 612                                 goto abort;
 613                         data->in_min[i] = rv;
 614
 615                         rv = lm80_read_value(client, LM80_REG_IN_MAX(i));
 616                         if (rv < 0)
 617                                 goto abort;
 618                         data->in_max[i] = rv;
 619                 }
 620
 621                 rv = lm80_read_value(client, LM80_REG_FAN1);
 622                 if (rv < 0)
 623                         goto abort;
 624                 data->fan[0] = rv;
 625
 626                 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
 627                 if (rv < 0)
 628                         goto abort;
 629                 data->fan_min[0] = rv;
 630
 631                 rv = lm80_read_value(client, LM80_REG_FAN2);
 632                 if (rv < 0)
 633                         goto abort;
 634                 data->fan[1] = rv;
 635
 636                 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
 637                 if (rv < 0)
 638                         goto abort;
 639                 data->fan_min[1] = rv;
 640
 641                 prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP);
 642                 if (rv < 0)
 643                         goto abort;
 644                 rv = lm80_read_value(client, LM80_REG_RES);
 645                 if (rv < 0)
 646                         goto abort;
 647                 data->temp = (prev_rv << 8) | (rv & 0xf0);
 648
 649                 rv = lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
 650                 if (rv < 0)
 651                         goto abort;
 652                 data->temp_os_max = rv;
 653
 654                 rv = lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
 655                 if (rv < 0)
 656                         goto abort;
 657                 data->temp_os_hyst = rv;
 658
 659                 rv = lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
 660                 if (rv < 0)
 661                         goto abort;
 662                 data->temp_hot_max = rv;
 663
 664                 rv = lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
 665                 if (rv < 0)
 666                         goto abort;
 667                 data->temp_hot_hyst = rv;
 668
 669                 rv = lm80_read_value(client, LM80_REG_FANDIV);
 670                 if (rv < 0)
 671                         goto abort;
 672                 data->fan_div[0] = (rv >> 2) & 0x03;
 673                 data->fan_div[1] = (rv >> 4) & 0x03;
 674
 675                 prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1);
 676                 if (rv < 0)
 677                         goto abort;
 678                 rv = lm80_read_value(client, LM80_REG_ALARM2);
 679                 if (rv < 0)
 680                         goto abort;
 681                 data->alarms = prev_rv + (rv << 8);
 682
 683                 data->last_updated = jiffies;
 684                 data->valid = 1;
 685                 data->error = 0;
 686         }
 687         goto done;
 688
 689 abort:
 690         ret = ERR_PTR(rv);
 691         data->valid = 0;
 692         data->error = 1;
 693
 694 done:
 695         mutex_unlock(&data->update_lock);
 696
 697         return ret;
 698 }
 699
 700 module_i2c_driver(lm80_driver);
 701
 702 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
 703         "Philip Edelbrock <phil@netroedge.com>");
 704 MODULE_DESCRIPTION("LM80 driver");
 705 MODULE_LICENSE("GPL");