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 <jdelvare@suse.de>
   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 #include <linux/regulator/consumer.h>
  70
  71 /*
  72  * Addresses to scan
  73  * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
  74  */
  75
  76 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  77
  78 /*
  79  * The LM87 registers
  80  */
  81
  82 /* nr in 0..5 */
  83 #define LM87_REG_IN(nr)                 (0x20 + (nr))
  84 #define LM87_REG_IN_MAX(nr)             (0x2B + (nr) * 2)
  85 #define LM87_REG_IN_MIN(nr)             (0x2C + (nr) * 2)
  86 /* nr in 0..1 */
  87 #define LM87_REG_AIN(nr)                (0x28 + (nr))
  88 #define LM87_REG_AIN_MIN(nr)            (0x1A + (nr))
  89 #define LM87_REG_AIN_MAX(nr)            (0x3B + (nr))
  90
  91 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  92 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  93 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  94
  95 #define LM87_REG_TEMP_HW_INT_LOCK       0x13
  96 #define LM87_REG_TEMP_HW_EXT_LOCK       0x14
  97 #define LM87_REG_TEMP_HW_INT            0x17
  98 #define LM87_REG_TEMP_HW_EXT            0x18
  99
 100 /* nr in 0..1 */
 101 #define LM87_REG_FAN(nr)                (0x28 + (nr))
 102 #define LM87_REG_FAN_MIN(nr)            (0x3B + (nr))
 103 #define LM87_REG_AOUT                   0x19
 104
 105 #define LM87_REG_CONFIG                 0x40
 106 #define LM87_REG_CHANNEL_MODE           0x16
 107 #define LM87_REG_VID_FAN_DIV            0x47
 108 #define LM87_REG_VID4                   0x49
 109
 110 #define LM87_REG_ALARMS1                0x41
 111 #define LM87_REG_ALARMS2                0x42
 112
 113 #define LM87_REG_COMPANY_ID             0x3E
 114 #define LM87_REG_REVISION               0x3F
 115
 116 /*
 117  * Conversions and various macros
 118  * The LM87 uses signed 8-bit values for temperatures.
 119  */
 120
 121 #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
 122 #define IN_TO_REG(val, scale)   ((val) <= 0 ? 0 : \
 123                                  (val) >= (scale) * 255 / 192 ? 255 : \
 124                                  ((val) * 192 + (scale) / 2) / (scale))
 125
 126 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
 127 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 128                                  (val) >= 126500 ? 127 : \
 129                                  (((val) < 0 ? (val) - 500 : \
 130                                    (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  * Client data (each client gets its own)
 153  */
 154
 155 struct lm87_data {
 156         struct mutex update_lock;
 157         char valid; /* zero until following fields are valid */
 158         unsigned long last_updated; /* In jiffies */
 159
 160         u8 channel;             /* register value */
 161         u8 config;              /* original register value */
 162
 163         u8 in[8];               /* register value */
 164         u8 in_max[8];           /* register value */
 165         u8 in_min[8];           /* register value */
 166         u16 in_scale[8];
 167
 168         s8 temp[3];             /* register value */
 169         s8 temp_high[3];        /* register value */
 170         s8 temp_low[3];         /* register value */
 171         s8 temp_crit_int;       /* min of two register values */
 172         s8 temp_crit_ext;       /* min of two register values */
 173
 174         u8 fan[2];              /* register value */
 175         u8 fan_min[2];          /* register value */
 176         u8 fan_div[2];          /* register value, shifted right */
 177         u8 aout;                /* register value */
 178
 179         u16 alarms;             /* register values, combined */
 180         u8 vid;                 /* register values, combined */
 181         u8 vrm;
 182
 183         const struct attribute_group *attr_groups[6];
 184 };
 185
 186 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 187 {
 188         return i2c_smbus_read_byte_data(client, reg);
 189 }
 190
 191 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 192 {
 193         return i2c_smbus_write_byte_data(client, reg, value);
 194 }
 195
 196 static struct lm87_data *lm87_update_device(struct device *dev)
 197 {
 198         struct i2c_client *client = dev_get_drvdata(dev);
 199         struct lm87_data *data = i2c_get_clientdata(client);
 200
 201         mutex_lock(&data->update_lock);
 202
 203         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 204                 int i, j;
 205
 206                 dev_dbg(&client->dev, "Updating data.\n");
 207
 208                 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
 209                 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
 210                 for (; i < j; i++) {
 211                         data->in[i] = lm87_read_value(client,
 212                                       LM87_REG_IN(i));
 213                         data->in_min[i] = lm87_read_value(client,
 214                                           LM87_REG_IN_MIN(i));
 215                         data->in_max[i] = lm87_read_value(client,
 216                                           LM87_REG_IN_MAX(i));
 217                 }
 218
 219                 for (i = 0; i < 2; i++) {
 220                         if (data->channel & CHAN_NO_FAN(i)) {
 221                                 data->in[6+i] = lm87_read_value(client,
 222                                                 LM87_REG_AIN(i));
 223                                 data->in_max[6+i] = lm87_read_value(client,
 224                                                     LM87_REG_AIN_MAX(i));
 225                                 data->in_min[6+i] = lm87_read_value(client,
 226                                                     LM87_REG_AIN_MIN(i));
 227
 228                         } else {
 229                                 data->fan[i] = lm87_read_value(client,
 230                                                LM87_REG_FAN(i));
 231                                 data->fan_min[i] = lm87_read_value(client,
 232                                                    LM87_REG_FAN_MIN(i));
 233                         }
 234                 }
 235
 236                 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
 237                 for (i = 0 ; i < j; i++) {
 238                         data->temp[i] = lm87_read_value(client,
 239                                         LM87_REG_TEMP[i]);
 240                         data->temp_high[i] = lm87_read_value(client,
 241                                              LM87_REG_TEMP_HIGH[i]);
 242                         data->temp_low[i] = lm87_read_value(client,
 243                                             LM87_REG_TEMP_LOW[i]);
 244                 }
 245
 246                 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
 247                 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
 248                 data->temp_crit_int = min(i, j);
 249
 250                 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
 251                 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
 252                 data->temp_crit_ext = min(i, j);
 253
 254                 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 255                 data->fan_div[0] = (i >> 4) & 0x03;
 256                 data->fan_div[1] = (i >> 6) & 0x03;
 257                 data->vid = (i & 0x0F)
 258                           | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
 259                              << 4;
 260
 261                 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
 262                              | (lm87_read_value(client, LM87_REG_ALARMS2)
 263                                 << 8);
 264                 data->aout = lm87_read_value(client, LM87_REG_AOUT);
 265
 266                 data->last_updated = jiffies;
 267                 data->valid = 1;
 268         }
 269
 270         mutex_unlock(&data->update_lock);
 271
 272         return data;
 273 }
 274
 275 /*
 276  * Sysfs stuff
 277  */
 278
 279 static ssize_t in_input_show(struct device *dev,
 280                              struct device_attribute *attr, char *buf)
 281 {
 282         struct lm87_data *data = lm87_update_device(dev);
 283         int nr = to_sensor_dev_attr(attr)->index;
 284
 285         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
 286                        data->in_scale[nr]));
 287 }
 288
 289 static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
 290                            char *buf)
 291 {
 292         struct lm87_data *data = lm87_update_device(dev);
 293         int nr = to_sensor_dev_attr(attr)->index;
 294
 295         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
 296                        data->in_scale[nr]));
 297 }
 298
 299 static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
 300                            char *buf)
 301 {
 302         struct lm87_data *data = lm87_update_device(dev);
 303         int nr = to_sensor_dev_attr(attr)->index;
 304
 305         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
 306                        data->in_scale[nr]));
 307 }
 308
 309 static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
 310                             const char *buf, size_t count)
 311 {
 312         struct i2c_client *client = dev_get_drvdata(dev);
 313         struct lm87_data *data = i2c_get_clientdata(client);
 314         int nr = to_sensor_dev_attr(attr)->index;
 315         long val;
 316         int err;
 317
 318         err = kstrtol(buf, 10, &val);
 319         if (err)
 320                 return err;
 321
 322         mutex_lock(&data->update_lock);
 323         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
 324         lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
 325                          LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
 326         mutex_unlock(&data->update_lock);
 327         return count;
 328 }
 329
 330 static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
 331                             const char *buf, size_t count)
 332 {
 333         struct i2c_client *client = dev_get_drvdata(dev);
 334         struct lm87_data *data = i2c_get_clientdata(client);
 335         int nr = to_sensor_dev_attr(attr)->index;
 336         long val;
 337         int err;
 338
 339         err = kstrtol(buf, 10, &val);
 340         if (err)
 341                 return err;
 342
 343         mutex_lock(&data->update_lock);
 344         data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
 345         lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
 346                          LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
 347         mutex_unlock(&data->update_lock);
 348         return count;
 349 }
 350
 351 static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0);
 352 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
 353 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
 354 static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1);
 355 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
 356 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
 357 static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2);
 358 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
 359 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
 360 static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3);
 361 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
 362 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
 363 static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4);
 364 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
 365 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
 366 static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5);
 367 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
 368 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
 369 static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6);
 370 static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
 371 static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
 372 static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7);
 373 static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
 374 static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
 375
 376 static ssize_t temp_input_show(struct device *dev,
 377                                struct device_attribute *attr, char *buf)
 378 {
 379         struct lm87_data *data = lm87_update_device(dev);
 380         int nr = to_sensor_dev_attr(attr)->index;
 381
 382         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 383 }
 384
 385 static ssize_t temp_low_show(struct device *dev,
 386                              struct device_attribute *attr, char *buf)
 387 {
 388         struct lm87_data *data = lm87_update_device(dev);
 389         int nr = to_sensor_dev_attr(attr)->index;
 390
 391         return sprintf(buf, "%d\n",
 392                        TEMP_FROM_REG(data->temp_low[nr]));
 393 }
 394
 395 static ssize_t temp_high_show(struct device *dev,
 396                               struct device_attribute *attr, char *buf)
 397 {
 398         struct lm87_data *data = lm87_update_device(dev);
 399         int nr = to_sensor_dev_attr(attr)->index;
 400
 401         return sprintf(buf, "%d\n",
 402                        TEMP_FROM_REG(data->temp_high[nr]));
 403 }
 404
 405 static ssize_t temp_low_store(struct device *dev,
 406                               struct device_attribute *attr, const char *buf,
 407                               size_t count)
 408 {
 409         struct i2c_client *client = dev_get_drvdata(dev);
 410         struct lm87_data *data = i2c_get_clientdata(client);
 411         int nr = to_sensor_dev_attr(attr)->index;
 412         long val;
 413         int err;
 414
 415         err = kstrtol(buf, 10, &val);
 416         if (err)
 417                 return err;
 418
 419         mutex_lock(&data->update_lock);
 420         data->temp_low[nr] = TEMP_TO_REG(val);
 421         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
 422         mutex_unlock(&data->update_lock);
 423         return count;
 424 }
 425
 426 static ssize_t temp_high_store(struct device *dev,
 427                                struct device_attribute *attr, const char *buf,
 428                                size_t count)
 429 {
 430         struct i2c_client *client = dev_get_drvdata(dev);
 431         struct lm87_data *data = i2c_get_clientdata(client);
 432         int nr = to_sensor_dev_attr(attr)->index;
 433         long val;
 434         int err;
 435
 436         err = kstrtol(buf, 10, &val);
 437         if (err)
 438                 return err;
 439
 440         mutex_lock(&data->update_lock);
 441         data->temp_high[nr] = TEMP_TO_REG(val);
 442         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
 443         mutex_unlock(&data->update_lock);
 444         return count;
 445 }
 446
 447 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
 448 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0);
 449 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0);
 450 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
 451 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1);
 452 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1);
 453 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
 454 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2);
 455 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2);
 456
 457 static ssize_t temp1_crit_show(struct device *dev,
 458                                struct device_attribute *attr, char *buf)
 459 {
 460         struct lm87_data *data = lm87_update_device(dev);
 461         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
 462 }
 463
 464 static ssize_t temp2_crit_show(struct device *dev,
 465                                struct device_attribute *attr, char *buf)
 466 {
 467         struct lm87_data *data = lm87_update_device(dev);
 468         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
 469 }
 470
 471 static DEVICE_ATTR_RO(temp1_crit);
 472 static DEVICE_ATTR_RO(temp2_crit);
 473 static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL);
 474
 475 static ssize_t fan_input_show(struct device *dev,
 476                               struct device_attribute *attr, char *buf)
 477 {
 478         struct lm87_data *data = lm87_update_device(dev);
 479         int nr = to_sensor_dev_attr(attr)->index;
 480
 481         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 482                        FAN_DIV_FROM_REG(data->fan_div[nr])));
 483 }
 484
 485 static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
 486                             char *buf)
 487 {
 488         struct lm87_data *data = lm87_update_device(dev);
 489         int nr = to_sensor_dev_attr(attr)->index;
 490
 491         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 492                        FAN_DIV_FROM_REG(data->fan_div[nr])));
 493 }
 494
 495 static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
 496                             char *buf)
 497 {
 498         struct lm87_data *data = lm87_update_device(dev);
 499         int nr = to_sensor_dev_attr(attr)->index;
 500
 501         return sprintf(buf, "%d\n",
 502                        FAN_DIV_FROM_REG(data->fan_div[nr]));
 503 }
 504
 505 static ssize_t fan_min_store(struct device *dev,
 506                              struct device_attribute *attr, const char *buf,
 507                              size_t count)
 508 {
 509         struct i2c_client *client = dev_get_drvdata(dev);
 510         struct lm87_data *data = i2c_get_clientdata(client);
 511         int nr = to_sensor_dev_attr(attr)->index;
 512         long val;
 513         int err;
 514
 515         err = kstrtol(buf, 10, &val);
 516         if (err)
 517                 return err;
 518
 519         mutex_lock(&data->update_lock);
 520         data->fan_min[nr] = FAN_TO_REG(val,
 521                             FAN_DIV_FROM_REG(data->fan_div[nr]));
 522         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
 523         mutex_unlock(&data->update_lock);
 524         return count;
 525 }
 526
 527 /*
 528  * Note: we save and restore the fan minimum here, because its value is
 529  * determined in part by the fan clock divider.  This follows the principle
 530  * of least surprise; the user doesn't expect the fan minimum to change just
 531  * because the divider changed.
 532  */
 533 static ssize_t fan_div_store(struct device *dev,
 534                              struct device_attribute *attr, const char *buf,
 535                              size_t count)
 536 {
 537         struct i2c_client *client = dev_get_drvdata(dev);
 538         struct lm87_data *data = i2c_get_clientdata(client);
 539         int nr = to_sensor_dev_attr(attr)->index;
 540         long val;
 541         int err;
 542         unsigned long min;
 543         u8 reg;
 544
 545         err = kstrtol(buf, 10, &val);
 546         if (err)
 547                 return err;
 548
 549         mutex_lock(&data->update_lock);
 550         min = FAN_FROM_REG(data->fan_min[nr],
 551                            FAN_DIV_FROM_REG(data->fan_div[nr]));
 552
 553         switch (val) {
 554         case 1:
 555                 data->fan_div[nr] = 0;
 556                 break;
 557         case 2:
 558                 data->fan_div[nr] = 1;
 559                 break;
 560         case 4:
 561                 data->fan_div[nr] = 2;
 562                 break;
 563         case 8:
 564                 data->fan_div[nr] = 3;
 565                 break;
 566         default:
 567                 mutex_unlock(&data->update_lock);
 568                 return -EINVAL;
 569         }
 570
 571         reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 572         switch (nr) {
 573         case 0:
 574             reg = (reg & 0xCF) | (data->fan_div[0] << 4);
 575             break;
 576         case 1:
 577             reg = (reg & 0x3F) | (data->fan_div[1] << 6);
 578             break;
 579         }
 580         lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
 581
 582         data->fan_min[nr] = FAN_TO_REG(min, val);
 583         lm87_write_value(client, LM87_REG_FAN_MIN(nr),
 584                          data->fan_min[nr]);
 585         mutex_unlock(&data->update_lock);
 586
 587         return count;
 588 }
 589
 590 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
 591 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
 592 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
 593 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
 594 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
 595 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
 596
 597 static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
 598                            char *buf)
 599 {
 600         struct lm87_data *data = lm87_update_device(dev);
 601         return sprintf(buf, "%d\n", data->alarms);
 602 }
 603 static DEVICE_ATTR_RO(alarms);
 604
 605 static ssize_t cpu0_vid_show(struct device *dev,
 606                              struct device_attribute *attr, char *buf)
 607 {
 608         struct lm87_data *data = lm87_update_device(dev);
 609         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 610 }
 611 static DEVICE_ATTR_RO(cpu0_vid);
 612
 613 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
 614                         char *buf)
 615 {
 616         struct lm87_data *data = dev_get_drvdata(dev);
 617         return sprintf(buf, "%d\n", data->vrm);
 618 }
 619 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
 620                          const char *buf, size_t count)
 621 {
 622         struct lm87_data *data = dev_get_drvdata(dev);
 623         unsigned long val;
 624         int err;
 625
 626         err = kstrtoul(buf, 10, &val);
 627         if (err)
 628                 return err;
 629
 630         if (val > 255)
 631                 return -EINVAL;
 632
 633         data->vrm = val;
 634         return count;
 635 }
 636 static DEVICE_ATTR_RW(vrm);
 637
 638 static ssize_t aout_output_show(struct device *dev,
 639                                 struct device_attribute *attr, char *buf)
 640 {
 641         struct lm87_data *data = lm87_update_device(dev);
 642         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 643 }
 644 static ssize_t aout_output_store(struct device *dev,
 645                                  struct device_attribute *attr,
 646                                  const char *buf, size_t count)
 647 {
 648         struct i2c_client *client = dev_get_drvdata(dev);
 649         struct lm87_data *data = i2c_get_clientdata(client);
 650         long val;
 651         int err;
 652
 653         err = kstrtol(buf, 10, &val);
 654         if (err)
 655                 return err;
 656
 657         mutex_lock(&data->update_lock);
 658         data->aout = AOUT_TO_REG(val);
 659         lm87_write_value(client, LM87_REG_AOUT, data->aout);
 660         mutex_unlock(&data->update_lock);
 661         return count;
 662 }
 663 static DEVICE_ATTR_RW(aout_output);
 664
 665 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 666                           char *buf)
 667 {
 668         struct lm87_data *data = lm87_update_device(dev);
 669         int bitnr = to_sensor_dev_attr(attr)->index;
 670         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 671 }
 672 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
 673 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
 674 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
 675 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
 676 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
 677 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
 678 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
 679 static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7);
 680 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
 681 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
 682 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5);
 683 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
 684 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
 685 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14);
 686 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15);
 687
 688 /*
 689  * Real code
 690  */
 691
 692 static struct attribute *lm87_attributes[] = {
 693         &sensor_dev_attr_in1_input.dev_attr.attr,
 694         &sensor_dev_attr_in1_min.dev_attr.attr,
 695         &sensor_dev_attr_in1_max.dev_attr.attr,
 696         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 697         &sensor_dev_attr_in2_input.dev_attr.attr,
 698         &sensor_dev_attr_in2_min.dev_attr.attr,
 699         &sensor_dev_attr_in2_max.dev_attr.attr,
 700         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 701         &sensor_dev_attr_in3_input.dev_attr.attr,
 702         &sensor_dev_attr_in3_min.dev_attr.attr,
 703         &sensor_dev_attr_in3_max.dev_attr.attr,
 704         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 705         &sensor_dev_attr_in4_input.dev_attr.attr,
 706         &sensor_dev_attr_in4_min.dev_attr.attr,
 707         &sensor_dev_attr_in4_max.dev_attr.attr,
 708         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 709
 710         &sensor_dev_attr_temp1_input.dev_attr.attr,
 711         &sensor_dev_attr_temp1_max.dev_attr.attr,
 712         &sensor_dev_attr_temp1_min.dev_attr.attr,
 713         &dev_attr_temp1_crit.attr,
 714         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 715         &sensor_dev_attr_temp2_input.dev_attr.attr,
 716         &sensor_dev_attr_temp2_max.dev_attr.attr,
 717         &sensor_dev_attr_temp2_min.dev_attr.attr,
 718         &dev_attr_temp2_crit.attr,
 719         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 720         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 721
 722         &dev_attr_alarms.attr,
 723         &dev_attr_aout_output.attr,
 724
 725         NULL
 726 };
 727
 728 static const struct attribute_group lm87_group = {
 729         .attrs = lm87_attributes,
 730 };
 731
 732 static struct attribute *lm87_attributes_in6[] = {
 733         &sensor_dev_attr_in6_input.dev_attr.attr,
 734         &sensor_dev_attr_in6_min.dev_attr.attr,
 735         &sensor_dev_attr_in6_max.dev_attr.attr,
 736         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 737         NULL
 738 };
 739
 740 static const struct attribute_group lm87_group_in6 = {
 741         .attrs = lm87_attributes_in6,
 742 };
 743
 744 static struct attribute *lm87_attributes_fan1[] = {
 745         &sensor_dev_attr_fan1_input.dev_attr.attr,
 746         &sensor_dev_attr_fan1_min.dev_attr.attr,
 747         &sensor_dev_attr_fan1_div.dev_attr.attr,
 748         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 749         NULL
 750 };
 751
 752 static const struct attribute_group lm87_group_fan1 = {
 753         .attrs = lm87_attributes_fan1,
 754 };
 755
 756 static struct attribute *lm87_attributes_in7[] = {
 757         &sensor_dev_attr_in7_input.dev_attr.attr,
 758         &sensor_dev_attr_in7_min.dev_attr.attr,
 759         &sensor_dev_attr_in7_max.dev_attr.attr,
 760         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 761         NULL
 762 };
 763
 764 static const struct attribute_group lm87_group_in7 = {
 765         .attrs = lm87_attributes_in7,
 766 };
 767
 768 static struct attribute *lm87_attributes_fan2[] = {
 769         &sensor_dev_attr_fan2_input.dev_attr.attr,
 770         &sensor_dev_attr_fan2_min.dev_attr.attr,
 771         &sensor_dev_attr_fan2_div.dev_attr.attr,
 772         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 773         NULL
 774 };
 775
 776 static const struct attribute_group lm87_group_fan2 = {
 777         .attrs = lm87_attributes_fan2,
 778 };
 779
 780 static struct attribute *lm87_attributes_temp3[] = {
 781         &sensor_dev_attr_temp3_input.dev_attr.attr,
 782         &sensor_dev_attr_temp3_max.dev_attr.attr,
 783         &sensor_dev_attr_temp3_min.dev_attr.attr,
 784         &dev_attr_temp3_crit.attr,
 785         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 786         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 787         NULL
 788 };
 789
 790 static const struct attribute_group lm87_group_temp3 = {
 791         .attrs = lm87_attributes_temp3,
 792 };
 793
 794 static struct attribute *lm87_attributes_in0_5[] = {
 795         &sensor_dev_attr_in0_input.dev_attr.attr,
 796         &sensor_dev_attr_in0_min.dev_attr.attr,
 797         &sensor_dev_attr_in0_max.dev_attr.attr,
 798         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 799         &sensor_dev_attr_in5_input.dev_attr.attr,
 800         &sensor_dev_attr_in5_min.dev_attr.attr,
 801         &sensor_dev_attr_in5_max.dev_attr.attr,
 802         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 803         NULL
 804 };
 805
 806 static const struct attribute_group lm87_group_in0_5 = {
 807         .attrs = lm87_attributes_in0_5,
 808 };
 809
 810 static struct attribute *lm87_attributes_vid[] = {
 811         &dev_attr_cpu0_vid.attr,
 812         &dev_attr_vrm.attr,
 813         NULL
 814 };
 815
 816 static const struct attribute_group lm87_group_vid = {
 817         .attrs = lm87_attributes_vid,
 818 };
 819
 820 /* Return 0 if detection is successful, -ENODEV otherwise */
 821 static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
 822 {
 823         struct i2c_adapter *adapter = client->adapter;
 824         const char *name;
 825         u8 cid, rev;
 826
 827         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 828                 return -ENODEV;
 829
 830         if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
 831                 return -ENODEV;
 832
 833         /* Now, we do the remaining detection. */
 834         cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
 835         rev = lm87_read_value(client, LM87_REG_REVISION);
 836
 837         if (cid == 0x02                 /* National Semiconductor */
 838          && (rev >= 0x01 && rev <= 0x08))
 839                 name = "lm87";
 840         else if (cid == 0x41            /* Analog Devices */
 841               && (rev & 0xf0) == 0x10)
 842                 name = "adm1024";
 843         else {
 844                 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
 845                         client->addr);
 846                 return -ENODEV;
 847         }
 848
 849         strlcpy(info->type, name, I2C_NAME_SIZE);
 850
 851         return 0;
 852 }
 853
 854 static void lm87_restore_config(void *arg)
 855 {
 856         struct i2c_client *client = arg;
 857         struct lm87_data *data = i2c_get_clientdata(client);
 858
 859         lm87_write_value(client, LM87_REG_CONFIG, data->config);
 860 }
 861
 862 static int lm87_init_client(struct i2c_client *client)
 863 {
 864         struct lm87_data *data = i2c_get_clientdata(client);
 865         int rc;
 866         struct device_node *of_node = client->dev.of_node;
 867         u8 val = 0;
 868         struct regulator *vcc = NULL;
 869
 870         if (of_node) {
 871                 if (of_property_read_bool(of_node, "has-temp3"))
 872                         val |= CHAN_TEMP3;
 873                 if (of_property_read_bool(of_node, "has-in6"))
 874                         val |= CHAN_NO_FAN(0);
 875                 if (of_property_read_bool(of_node, "has-in7"))
 876                         val |= CHAN_NO_FAN(1);
 877                 vcc = devm_regulator_get_optional(&client->dev, "vcc");
 878                 if (!IS_ERR(vcc)) {
 879                         if (regulator_get_voltage(vcc) == 5000000)
 880                                 val |= CHAN_VCC_5V;
 881                 }
 882                 data->channel = val;
 883                 lm87_write_value(client,
 884                                 LM87_REG_CHANNEL_MODE, data->channel);
 885         } else if (dev_get_platdata(&client->dev)) {
 886                 data->channel = *(u8 *)dev_get_platdata(&client->dev);
 887                 lm87_write_value(client,
 888                                  LM87_REG_CHANNEL_MODE, data->channel);
 889         } else {
 890                 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
 891         }
 892         data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
 893
 894         rc = devm_add_action(&client->dev, lm87_restore_config, client);
 895         if (rc)
 896                 return rc;
 897
 898         if (!(data->config & 0x01)) {
 899                 int i;
 900
 901                 /* Limits are left uninitialized after power-up */
 902                 for (i = 1; i < 6; i++) {
 903                         lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
 904                         lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
 905                 }
 906                 for (i = 0; i < 2; i++) {
 907                         lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
 908                         lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
 909                         lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
 910                         lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
 911                 }
 912                 if (data->channel & CHAN_TEMP3) {
 913                         lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
 914                         lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
 915                 } else {
 916                         lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
 917                         lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
 918                 }
 919         }
 920
 921         /* Make sure Start is set and INT#_Clear is clear */
 922         if ((data->config & 0x09) != 0x01)
 923                 lm87_write_value(client, LM87_REG_CONFIG,
 924                                  (data->config & 0x77) | 0x01);
 925         return 0;
 926 }
 927
 928 static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
 929 {
 930         struct lm87_data *data;
 931         struct device *hwmon_dev;
 932         int err;
 933         unsigned int group_tail = 0;
 934
 935         data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
 936         if (!data)
 937                 return -ENOMEM;
 938
 939         i2c_set_clientdata(client, data);
 940         mutex_init(&data->update_lock);
 941
 942         /* Initialize the LM87 chip */
 943         err = lm87_init_client(client);
 944         if (err)
 945                 return err;
 946
 947         data->in_scale[0] = 2500;
 948         data->in_scale[1] = 2700;
 949         data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
 950         data->in_scale[3] = 5000;
 951         data->in_scale[4] = 12000;
 952         data->in_scale[5] = 2700;
 953         data->in_scale[6] = 1875;
 954         data->in_scale[7] = 1875;
 955
 956         /*
 957          * Construct the list of attributes, the list depends on the
 958          * configuration of the chip
 959          */
 960         data->attr_groups[group_tail++] = &lm87_group;
 961         if (data->channel & CHAN_NO_FAN(0))
 962                 data->attr_groups[group_tail++] = &lm87_group_in6;
 963         else
 964                 data->attr_groups[group_tail++] = &lm87_group_fan1;
 965
 966         if (data->channel & CHAN_NO_FAN(1))
 967                 data->attr_groups[group_tail++] = &lm87_group_in7;
 968         else
 969                 data->attr_groups[group_tail++] = &lm87_group_fan2;
 970
 971         if (data->channel & CHAN_TEMP3)
 972                 data->attr_groups[group_tail++] = &lm87_group_temp3;
 973         else
 974                 data->attr_groups[group_tail++] = &lm87_group_in0_5;
 975
 976         if (!(data->channel & CHAN_NO_VID)) {
 977                 data->vrm = vid_which_vrm();
 978                 data->attr_groups[group_tail++] = &lm87_group_vid;
 979         }
 980
 981         hwmon_dev = devm_hwmon_device_register_with_groups(
 982             &client->dev, client->name, client, data->attr_groups);
 983         return PTR_ERR_OR_ZERO(hwmon_dev);
 984 }
 985
 986 /*
 987  * Driver data (common to all clients)
 988  */
 989
 990 static const struct i2c_device_id lm87_id[] = {
 991         { "lm87", 0 },
 992         { "adm1024", 0 },
 993         { }
 994 };
 995 MODULE_DEVICE_TABLE(i2c, lm87_id);
 996
 997 static const struct of_device_id lm87_of_match[] = {
 998         { .compatible = "ti,lm87" },
 999         { .compatible = "adi,adm1024" },
1000         { },
1001 };
1002 MODULE_DEVICE_TABLE(of, lm87_of_match);
1003
1004 static struct i2c_driver lm87_driver = {
1005         .class          = I2C_CLASS_HWMON,
1006         .driver = {
1007                 .name   = "lm87",
1008                 .of_match_table = lm87_of_match,
1009         },
1010         .probe          = lm87_probe,
1011         .id_table       = lm87_id,
1012         .detect         = lm87_detect,
1013         .address_list   = normal_i2c,
1014 };
1015
1016 module_i2c_driver(lm87_driver);
1017
1018 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");
1019 MODULE_DESCRIPTION("LM87 driver");
1020 MODULE_LICENSE("GPL");