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 #define TEMP_FROM_REG(reg)      ((reg) * 125 / 32)
  90 #define TEMP_TO_REG(temp)       (DIV_ROUND_CLOSEST(clamp_val((temp), \
  91                                         -128000, 127000), 1000) << 8)
  92
  93 #define DIV_FROM_REG(val)               (1 << (val))
  94
  95 enum temp_index {
  96         t_input = 0,
  97         t_hot_max,
  98         t_hot_hyst,
  99         t_os_max,
 100         t_os_hyst,
 101         t_num_temp
 102 };
 103
 104 static const u8 temp_regs[t_num_temp] = {
 105         [t_input] = LM80_REG_TEMP,
 106         [t_hot_max] = LM80_REG_TEMP_HOT_MAX,
 107         [t_hot_hyst] = LM80_REG_TEMP_HOT_HYST,
 108         [t_os_max] = LM80_REG_TEMP_OS_MAX,
 109         [t_os_hyst] = LM80_REG_TEMP_OS_HYST,
 110 };
 111
 112 enum in_index {
 113         i_input = 0,
 114         i_max,
 115         i_min,
 116         i_num_in
 117 };
 118
 119 enum fan_index {
 120         f_input,
 121         f_min,
 122         f_num_fan
 123 };
 124
 125 /*
 126  * Client data (each client gets its own)
 127  */
 128
 129 struct lm80_data {
 130         struct i2c_client *client;
 131         struct mutex update_lock;
 132         char error;             /* !=0 if error occurred during last update */
 133         char valid;             /* !=0 if following fields are valid */
 134         unsigned long last_updated;     /* In jiffies */
 135
 136         u8 in[i_num_in][7];     /* Register value, 1st index is enum in_index */
 137         u8 fan[f_num_fan][2];   /* Register value, 1st index enum fan_index */
 138         u8 fan_div[2];          /* Register encoding, shifted right */
 139         s16 temp[t_num_temp];   /* Register values, normalized to 16 bit */
 140         u16 alarms;             /* Register encoding, combined */
 141 };
 142
 143 static int lm80_read_value(struct i2c_client *client, u8 reg)
 144 {
 145         return i2c_smbus_read_byte_data(client, reg);
 146 }
 147
 148 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
 149 {
 150         return i2c_smbus_write_byte_data(client, reg, value);
 151 }
 152
 153 /* Called when we have found a new LM80 and after read errors */
 154 static void lm80_init_client(struct i2c_client *client)
 155 {
 156         /*
 157          * Reset all except Watchdog values and last conversion values
 158          * This sets fan-divs to 2, among others. This makes most other
 159          * initializations unnecessary
 160          */
 161         lm80_write_value(client, LM80_REG_CONFIG, 0x80);
 162         /* Set 11-bit temperature resolution */
 163         lm80_write_value(client, LM80_REG_RES, 0x08);
 164
 165         /* Start monitoring */
 166         lm80_write_value(client, LM80_REG_CONFIG, 0x01);
 167 }
 168
 169 static struct lm80_data *lm80_update_device(struct device *dev)
 170 {
 171         struct lm80_data *data = dev_get_drvdata(dev);
 172         struct i2c_client *client = data->client;
 173         int i;
 174         int rv;
 175         int prev_rv;
 176         struct lm80_data *ret = data;
 177
 178         mutex_lock(&data->update_lock);
 179
 180         if (data->error)
 181                 lm80_init_client(client);
 182
 183         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 184                 dev_dbg(dev, "Starting lm80 update\n");
 185                 for (i = 0; i <= 6; i++) {
 186                         rv = lm80_read_value(client, LM80_REG_IN(i));
 187                         if (rv < 0)
 188                                 goto abort;
 189                         data->in[i_input][i] = rv;
 190
 191                         rv = lm80_read_value(client, LM80_REG_IN_MIN(i));
 192                         if (rv < 0)
 193                                 goto abort;
 194                         data->in[i_min][i] = rv;
 195
 196                         rv = lm80_read_value(client, LM80_REG_IN_MAX(i));
 197                         if (rv < 0)
 198                                 goto abort;
 199                         data->in[i_max][i] = rv;
 200                 }
 201
 202                 rv = lm80_read_value(client, LM80_REG_FAN1);
 203                 if (rv < 0)
 204                         goto abort;
 205                 data->fan[f_input][0] = rv;
 206
 207                 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
 208                 if (rv < 0)
 209                         goto abort;
 210                 data->fan[f_min][0] = rv;
 211
 212                 rv = lm80_read_value(client, LM80_REG_FAN2);
 213                 if (rv < 0)
 214                         goto abort;
 215                 data->fan[f_input][1] = rv;
 216
 217                 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
 218                 if (rv < 0)
 219                         goto abort;
 220                 data->fan[f_min][1] = rv;
 221
 222                 prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP);
 223                 if (rv < 0)
 224                         goto abort;
 225                 rv = lm80_read_value(client, LM80_REG_RES);
 226                 if (rv < 0)
 227                         goto abort;
 228                 data->temp[t_input] = (prev_rv << 8) | (rv & 0xf0);
 229
 230                 for (i = t_input + 1; i < t_num_temp; i++) {
 231                         rv = lm80_read_value(client, temp_regs[i]);
 232                         if (rv < 0)
 233                                 goto abort;
 234                         data->temp[i] = rv << 8;
 235                 }
 236
 237                 rv = lm80_read_value(client, LM80_REG_FANDIV);
 238                 if (rv < 0)
 239                         goto abort;
 240                 data->fan_div[0] = (rv >> 2) & 0x03;
 241                 data->fan_div[1] = (rv >> 4) & 0x03;
 242
 243                 prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1);
 244                 if (rv < 0)
 245                         goto abort;
 246                 rv = lm80_read_value(client, LM80_REG_ALARM2);
 247                 if (rv < 0)
 248                         goto abort;
 249                 data->alarms = prev_rv + (rv << 8);
 250
 251                 data->last_updated = jiffies;
 252                 data->valid = 1;
 253                 data->error = 0;
 254         }
 255         goto done;
 256
 257 abort:
 258         ret = ERR_PTR(rv);
 259         data->valid = 0;
 260         data->error = 1;
 261
 262 done:
 263         mutex_unlock(&data->update_lock);
 264
 265         return ret;
 266 }
 267
 268 /*
 269  * Sysfs stuff
 270  */
 271
 272 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 273                        char *buf)
 274 {
 275         struct lm80_data *data = lm80_update_device(dev);
 276         int index = to_sensor_dev_attr_2(attr)->index;
 277         int nr = to_sensor_dev_attr_2(attr)->nr;
 278
 279         if (IS_ERR(data))
 280                 return PTR_ERR(data);
 281         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr][index]));
 282 }
 283
 284 static ssize_t set_in(struct device *dev, struct device_attribute *attr,
 285                       const char *buf, size_t count)
 286 {
 287         struct lm80_data *data = dev_get_drvdata(dev);
 288         struct i2c_client *client = data->client;
 289         int index = to_sensor_dev_attr_2(attr)->index;
 290         int nr = to_sensor_dev_attr_2(attr)->nr;
 291         long val;
 292         u8 reg;
 293         int err = kstrtol(buf, 10, &val);
 294         if (err < 0)
 295                 return err;
 296
 297         reg = nr == i_min ? LM80_REG_IN_MIN(index) : LM80_REG_IN_MAX(index);
 298
 299         mutex_lock(&data->update_lock);
 300         data->in[nr][index] = IN_TO_REG(val);
 301         lm80_write_value(client, reg, data->in[nr][index]);
 302         mutex_unlock(&data->update_lock);
 303         return count;
 304 }
 305
 306 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 307                         char *buf)
 308 {
 309         int index = to_sensor_dev_attr_2(attr)->index;
 310         int nr = to_sensor_dev_attr_2(attr)->nr;
 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", FAN_FROM_REG(data->fan[nr][index],
 315                        DIV_FROM_REG(data->fan_div[index])));
 316 }
 317
 318 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 319         char *buf)
 320 {
 321         int nr = to_sensor_dev_attr(attr)->index;
 322         struct lm80_data *data = lm80_update_device(dev);
 323         if (IS_ERR(data))
 324                 return PTR_ERR(data);
 325         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 326 }
 327
 328 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 329         const char *buf, size_t count)
 330 {
 331         int index = to_sensor_dev_attr_2(attr)->index;
 332         int nr = to_sensor_dev_attr_2(attr)->nr;
 333         struct lm80_data *data = dev_get_drvdata(dev);
 334         struct i2c_client *client = data->client;
 335         unsigned long val;
 336         int err = kstrtoul(buf, 10, &val);
 337         if (err < 0)
 338                 return err;
 339
 340         mutex_lock(&data->update_lock);
 341         data->fan[nr][index] = FAN_TO_REG(val,
 342                                           DIV_FROM_REG(data->fan_div[index]));
 343         lm80_write_value(client, LM80_REG_FAN_MIN(index + 1),
 344                          data->fan[nr][index]);
 345         mutex_unlock(&data->update_lock);
 346         return count;
 347 }
 348
 349 /*
 350  * Note: we save and restore the fan minimum here, because its value is
 351  * determined in part by the fan divisor.  This follows the principle of
 352  * least surprise; the user doesn't expect the fan minimum to change just
 353  * because the divisor changed.
 354  */
 355 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 356         const char *buf, size_t count)
 357 {
 358         int nr = to_sensor_dev_attr(attr)->index;
 359         struct lm80_data *data = dev_get_drvdata(dev);
 360         struct i2c_client *client = data->client;
 361         unsigned long min, val;
 362         u8 reg;
 363         int err = kstrtoul(buf, 10, &val);
 364         if (err < 0)
 365                 return err;
 366
 367         /* Save fan_min */
 368         mutex_lock(&data->update_lock);
 369         min = FAN_FROM_REG(data->fan[f_min][nr],
 370                            DIV_FROM_REG(data->fan_div[nr]));
 371
 372         switch (val) {
 373         case 1:
 374                 data->fan_div[nr] = 0;
 375                 break;
 376         case 2:
 377                 data->fan_div[nr] = 1;
 378                 break;
 379         case 4:
 380                 data->fan_div[nr] = 2;
 381                 break;
 382         case 8:
 383                 data->fan_div[nr] = 3;
 384                 break;
 385         default:
 386                 dev_err(dev,
 387                         "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
 388                         val);
 389                 mutex_unlock(&data->update_lock);
 390                 return -EINVAL;
 391         }
 392
 393         reg = (lm80_read_value(client, LM80_REG_FANDIV) &
 394                ~(3 << (2 * (nr + 1)))) | (data->fan_div[nr] << (2 * (nr + 1)));
 395         lm80_write_value(client, LM80_REG_FANDIV, reg);
 396
 397         /* Restore fan_min */
 398         data->fan[f_min][nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 399         lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1),
 400                          data->fan[f_min][nr]);
 401         mutex_unlock(&data->update_lock);
 402
 403         return count;
 404 }
 405
 406 static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
 407                          char *buf)
 408 {
 409         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 410         struct lm80_data *data = lm80_update_device(dev);
 411         if (IS_ERR(data))
 412                 return PTR_ERR(data);
 413         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
 414 }
 415
 416 static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
 417                         const char *buf, size_t count)
 418 {
 419         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 420         struct lm80_data *data = dev_get_drvdata(dev);
 421         struct i2c_client *client = data->client;
 422         int nr = attr->index;
 423         long val;
 424         int err = kstrtol(buf, 10, &val);
 425         if (err < 0)
 426                 return err;
 427
 428         mutex_lock(&data->update_lock);
 429         data->temp[nr] = TEMP_TO_REG(val);
 430         lm80_write_value(client, temp_regs[nr], data->temp[nr] >> 8);
 431         mutex_unlock(&data->update_lock);
 432         return count;
 433 }
 434
 435 static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
 436                            char *buf)
 437 {
 438         struct lm80_data *data = lm80_update_device(dev);
 439         if (IS_ERR(data))
 440                 return PTR_ERR(data);
 441         return sprintf(buf, "%u\n", data->alarms);
 442 }
 443
 444 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 445                           char *buf)
 446 {
 447         int bitnr = to_sensor_dev_attr(attr)->index;
 448         struct lm80_data *data = lm80_update_device(dev);
 449         if (IS_ERR(data))
 450                 return PTR_ERR(data);
 451         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 452 }
 453
 454 static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO,
 455                 show_in, set_in, i_min, 0);
 456 static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO,
 457                 show_in, set_in, i_min, 1);
 458 static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO,
 459                 show_in, set_in, i_min, 2);
 460 static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO,
 461                 show_in, set_in, i_min, 3);
 462 static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO,
 463                 show_in, set_in, i_min, 4);
 464 static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO,
 465                 show_in, set_in, i_min, 5);
 466 static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO,
 467                 show_in, set_in, i_min, 6);
 468 static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO,
 469                 show_in, set_in, i_max, 0);
 470 static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO,
 471                 show_in, set_in, i_max, 1);
 472 static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO,
 473                 show_in, set_in, i_max, 2);
 474 static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO,
 475                 show_in, set_in, i_max, 3);
 476 static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO,
 477                 show_in, set_in, i_max, 4);
 478 static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO,
 479                 show_in, set_in, i_max, 5);
 480 static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO,
 481                 show_in, set_in, i_max, 6);
 482 static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, i_input, 0);
 483 static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, i_input, 1);
 484 static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, i_input, 2);
 485 static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, i_input, 3);
 486 static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, i_input, 4);
 487 static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_in, NULL, i_input, 5);
 488 static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO, show_in, NULL, i_input, 6);
 489 static SENSOR_DEVICE_ATTR_2(fan1_min, S_IWUSR | S_IRUGO,
 490                 show_fan, set_fan_min, f_min, 0);
 491 static SENSOR_DEVICE_ATTR_2(fan2_min, S_IWUSR | S_IRUGO,
 492                 show_fan, set_fan_min, f_min, 1);
 493 static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_fan, NULL, f_input, 0);
 494 static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_fan, NULL, f_input, 1);
 495 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
 496                 show_fan_div, set_fan_div, 0);
 497 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
 498                 show_fan_div, set_fan_div, 1);
 499 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, t_input);
 500 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp,
 501                 set_temp, t_hot_max);
 502 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp,
 503                 set_temp, t_hot_hyst);
 504 static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
 505                 set_temp, t_os_max);
 506 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp,
 507                 set_temp, t_os_hyst);
 508 static DEVICE_ATTR_RO(alarms);
 509 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 510 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 511 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 512 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 513 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
 514 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
 515 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
 516 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
 517 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
 518 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
 519 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
 520
 521 /*
 522  * Real code
 523  */
 524
 525 static struct attribute *lm80_attrs[] = {
 526         &sensor_dev_attr_in0_min.dev_attr.attr,
 527         &sensor_dev_attr_in1_min.dev_attr.attr,
 528         &sensor_dev_attr_in2_min.dev_attr.attr,
 529         &sensor_dev_attr_in3_min.dev_attr.attr,
 530         &sensor_dev_attr_in4_min.dev_attr.attr,
 531         &sensor_dev_attr_in5_min.dev_attr.attr,
 532         &sensor_dev_attr_in6_min.dev_attr.attr,
 533         &sensor_dev_attr_in0_max.dev_attr.attr,
 534         &sensor_dev_attr_in1_max.dev_attr.attr,
 535         &sensor_dev_attr_in2_max.dev_attr.attr,
 536         &sensor_dev_attr_in3_max.dev_attr.attr,
 537         &sensor_dev_attr_in4_max.dev_attr.attr,
 538         &sensor_dev_attr_in5_max.dev_attr.attr,
 539         &sensor_dev_attr_in6_max.dev_attr.attr,
 540         &sensor_dev_attr_in0_input.dev_attr.attr,
 541         &sensor_dev_attr_in1_input.dev_attr.attr,
 542         &sensor_dev_attr_in2_input.dev_attr.attr,
 543         &sensor_dev_attr_in3_input.dev_attr.attr,
 544         &sensor_dev_attr_in4_input.dev_attr.attr,
 545         &sensor_dev_attr_in5_input.dev_attr.attr,
 546         &sensor_dev_attr_in6_input.dev_attr.attr,
 547         &sensor_dev_attr_fan1_min.dev_attr.attr,
 548         &sensor_dev_attr_fan2_min.dev_attr.attr,
 549         &sensor_dev_attr_fan1_input.dev_attr.attr,
 550         &sensor_dev_attr_fan2_input.dev_attr.attr,
 551         &sensor_dev_attr_fan1_div.dev_attr.attr,
 552         &sensor_dev_attr_fan2_div.dev_attr.attr,
 553         &sensor_dev_attr_temp1_input.dev_attr.attr,
 554         &sensor_dev_attr_temp1_max.dev_attr.attr,
 555         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 556         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 557         &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
 558         &dev_attr_alarms.attr,
 559         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 560         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 561         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 562         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 563         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 564         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 565         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 566         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 567         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 568         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 569         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 570         NULL
 571 };
 572 ATTRIBUTE_GROUPS(lm80);
 573
 574 /* Return 0 if detection is successful, -ENODEV otherwise */
 575 static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
 576 {
 577         struct i2c_adapter *adapter = client->adapter;
 578         int i, cur, man_id, dev_id;
 579         const char *name = NULL;
 580
 581         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 582                 return -ENODEV;
 583
 584         /* First check for unused bits, common to both chip types */
 585         if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
 586          || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80))
 587                 return -ENODEV;
 588
 589         /*
 590          * The LM96080 has manufacturer and stepping/die rev registers so we
 591          * can just check that. The LM80 does not have such registers so we
 592          * have to use a more expensive trick.
 593          */
 594         man_id = lm80_read_value(client, LM96080_REG_MAN_ID);
 595         dev_id = lm80_read_value(client, LM96080_REG_DEV_ID);
 596         if (man_id == 0x01 && dev_id == 0x08) {
 597                 /* Check more unused bits for confirmation */
 598                 if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe)
 599                         return -ENODEV;
 600
 601                 name = "lm96080";
 602         } else {
 603                 /* Check 6-bit addressing */
 604                 for (i = 0x2a; i <= 0x3d; i++) {
 605                         cur = i2c_smbus_read_byte_data(client, i);
 606                         if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
 607                          || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
 608                          || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
 609                                 return -ENODEV;
 610                 }
 611
 612                 name = "lm80";
 613         }
 614
 615         strlcpy(info->type, name, I2C_NAME_SIZE);
 616
 617         return 0;
 618 }
 619
 620 static int lm80_probe(struct i2c_client *client,
 621                       const struct i2c_device_id *id)
 622 {
 623         struct device *dev = &client->dev;
 624         struct device *hwmon_dev;
 625         struct lm80_data *data;
 626
 627         data = devm_kzalloc(dev, sizeof(struct lm80_data), GFP_KERNEL);
 628         if (!data)
 629                 return -ENOMEM;
 630
 631         data->client = client;
 632         mutex_init(&data->update_lock);
 633
 634         /* Initialize the LM80 chip */
 635         lm80_init_client(client);
 636
 637         /* A few vars need to be filled upon startup */
 638         data->fan[f_min][0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
 639         data->fan[f_min][1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
 640
 641         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 642                                                            data, lm80_groups);
 643
 644         return PTR_ERR_OR_ZERO(hwmon_dev);
 645 }
 646
 647 /*
 648  * Driver data (common to all clients)
 649  */
 650
 651 static const struct i2c_device_id lm80_id[] = {
 652         { "lm80", 0 },
 653         { "lm96080", 1 },
 654         { }
 655 };
 656 MODULE_DEVICE_TABLE(i2c, lm80_id);
 657
 658 static struct i2c_driver lm80_driver = {
 659         .class          = I2C_CLASS_HWMON,
 660         .driver = {
 661                 .name   = "lm80",
 662         },
 663         .probe          = lm80_probe,
 664         .id_table       = lm80_id,
 665         .detect         = lm80_detect,
 666         .address_list   = normal_i2c,
 667 };
 668
 669 module_i2c_driver(lm80_driver);
 670
 671 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
 672         "Philip Edelbrock <phil@netroedge.com>");
 673 MODULE_DESCRIPTION("LM80 driver");
 674 MODULE_LICENSE("GPL");