drivers/hwmon/lm87.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * lm87.c
   4  *
   5  * Copyright (C) 2000       Frodo Looijaard <frodol@dds.nl>
   6  *                          Philip Edelbrock <phil@netroedge.com>
   7  *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
   8  *                          Dan Eaton <dan.eaton@rocketlogix.com>
   9  * Copyright (C) 2004-2008  Jean Delvare <jdelvare@suse.de>
  10  *
  11  * Original port to Linux 2.6 by Jeff Oliver.
  12  *
  13  * The LM87 is a sensor chip made by National Semiconductor. It monitors up
  14  * to 8 voltages (including its own power source), up to three temperatures
  15  * (its own plus up to two external ones) and up to two fans. The default
  16  * configuration is 6 voltages, two temperatures and two fans (see below).
  17  * Voltages are scaled internally with ratios such that the nominal value of
  18  * each voltage correspond to a register value of 192 (which means a
  19  * resolution of about 0.5% of the nominal value). Temperature values are
  20  * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
  21  * datasheet can be obtained from National's website at:
  22  *   http://www.national.com/pf/LM/LM87.html
  23  *
  24  * Some functions share pins, so not all functions are available at the same
  25  * time. Which are depends on the hardware setup. This driver normally
  26  * assumes that firmware configured the chip correctly. Where this is not
  27  * the case, platform code must set the I2C client's platform_data to point
  28  * to a u8 value to be written to the channel register.
  29  * For reference, here is the list of exclusive functions:
  30  *  - in0+in5 (default) or temp3
  31  *  - fan1 (default) or in6
  32  *  - fan2 (default) or in7
  33  *  - VID lines (default) or IRQ lines (not handled by this driver)
  34  *
  35  * The LM87 additionally features an analog output, supposedly usable to
  36  * control the speed of a fan. All new chips use pulse width modulation
  37  * instead. The LM87 is the only hardware monitoring chipset I know of
  38  * which uses amplitude modulation. Be careful when using this feature.
  39  *
  40  * This driver also supports the ADM1024, a sensor chip made by Analog
  41  * Devices. That chip is fully compatible with the LM87. Complete
  42  * datasheet can be obtained from Analog's website at:
  43  *   http://www.analog.com/en/prod/0,2877,ADM1024,00.html
  44  */
  45
  46 #include <linux/module.h>
  47 #include <linux/init.h>
  48 #include <linux/slab.h>
  49 #include <linux/jiffies.h>
  50 #include <linux/i2c.h>
  51 #include <linux/hwmon.h>
  52 #include <linux/hwmon-sysfs.h>
  53 #include <linux/hwmon-vid.h>
  54 #include <linux/err.h>
  55 #include <linux/mutex.h>
  56 #include <linux/regulator/consumer.h>
  57
  58 /*
  59  * Addresses to scan
  60  * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
  61  */
  62
  63 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  64
  65 /*
  66  * The LM87 registers
  67  */
  68
  69 /* nr in 0..5 */
  70 #define LM87_REG_IN(nr)                 (0x20 + (nr))
  71 #define LM87_REG_IN_MAX(nr)             (0x2B + (nr) * 2)
  72 #define LM87_REG_IN_MIN(nr)             (0x2C + (nr) * 2)
  73 /* nr in 0..1 */
  74 #define LM87_REG_AIN(nr)                (0x28 + (nr))
  75 #define LM87_REG_AIN_MIN(nr)            (0x1A + (nr))
  76 #define LM87_REG_AIN_MAX(nr)            (0x3B + (nr))
  77
  78 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  79 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  80 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  81
  82 #define LM87_REG_TEMP_HW_INT_LOCK       0x13
  83 #define LM87_REG_TEMP_HW_EXT_LOCK       0x14
  84 #define LM87_REG_TEMP_HW_INT            0x17
  85 #define LM87_REG_TEMP_HW_EXT            0x18
  86
  87 /* nr in 0..1 */
  88 #define LM87_REG_FAN(nr)                (0x28 + (nr))
  89 #define LM87_REG_FAN_MIN(nr)            (0x3B + (nr))
  90 #define LM87_REG_AOUT                   0x19
  91
  92 #define LM87_REG_CONFIG                 0x40
  93 #define LM87_REG_CHANNEL_MODE           0x16
  94 #define LM87_REG_VID_FAN_DIV            0x47
  95 #define LM87_REG_VID4                   0x49
  96
  97 #define LM87_REG_ALARMS1                0x41
  98 #define LM87_REG_ALARMS2                0x42
  99
 100 #define LM87_REG_COMPANY_ID             0x3E
 101 #define LM87_REG_REVISION               0x3F
 102
 103 /*
 104  * Conversions and various macros
 105  * The LM87 uses signed 8-bit values for temperatures.
 106  */
 107
 108 #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
 109 #define IN_TO_REG(val, scale)   ((val) <= 0 ? 0 : \
 110                                  (val) >= (scale) * 255 / 192 ? 255 : \
 111                                  ((val) * 192 + (scale) / 2) / (scale))
 112
 113 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
 114 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 115                                  (val) >= 126500 ? 127 : \
 116                                  (((val) < 0 ? (val) - 500 : \
 117                                    (val) + 500) / 1000))
 118
 119 #define FAN_FROM_REG(reg, div)  ((reg) == 255 || (reg) == 0 ? 0 : \
 120                                  (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
 121 #define FAN_TO_REG(val, div)    ((val) * (div) * 255 <= 1350000 ? 255 : \
 122                                  (1350000 + (val)*(div) / 2) / ((val) * (div)))
 123
 124 #define FAN_DIV_FROM_REG(reg)   (1 << (reg))
 125
 126 /* analog out is 9.80mV/LSB */
 127 #define AOUT_FROM_REG(reg)      (((reg) * 98 + 5) / 10)
 128 #define AOUT_TO_REG(val)        ((val) <= 0 ? 0 : \
 129                                  (val) >= 2500 ? 255 : \
 130                                  ((val) * 10 + 49) / 98)
 131
 132 /* nr in 0..1 */
 133 #define CHAN_NO_FAN(nr)         (1 << (nr))
 134 #define CHAN_TEMP3              (1 << 2)
 135 #define CHAN_VCC_5V             (1 << 3)
 136 #define CHAN_NO_VID             (1 << 7)
 137
 138 /*
 139  * Client data (each client gets its own)
 140  */
 141
 142 struct lm87_data {
 143         struct mutex update_lock;
 144         char valid; /* zero until following fields are valid */
 145         unsigned long last_updated; /* In jiffies */
 146
 147         u8 channel;             /* register value */
 148         u8 config;              /* original register value */
 149
 150         u8 in[8];               /* register value */
 151         u8 in_max[8];           /* register value */
 152         u8 in_min[8];           /* register value */
 153         u16 in_scale[8];
 154
 155         s8 temp[3];             /* register value */
 156         s8 temp_high[3];        /* register value */
 157         s8 temp_low[3];         /* register value */
 158         s8 temp_crit_int;       /* min of two register values */
 159         s8 temp_crit_ext;       /* min of two register values */
 160
 161         u8 fan[2];              /* register value */
 162         u8 fan_min[2];          /* register value */
 163         u8 fan_div[2];          /* register value, shifted right */
 164         u8 aout;                /* register value */
 165
 166         u16 alarms;             /* register values, combined */
 167         u8 vid;                 /* register values, combined */
 168         u8 vrm;
 169
 170         const struct attribute_group *attr_groups[6];
 171 };
 172
 173 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 174 {
 175         return i2c_smbus_read_byte_data(client, reg);
 176 }
 177
 178 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 179 {
 180         return i2c_smbus_write_byte_data(client, reg, value);
 181 }
 182
 183 static struct lm87_data *lm87_update_device(struct device *dev)
 184 {
 185         struct i2c_client *client = dev_get_drvdata(dev);
 186         struct lm87_data *data = i2c_get_clientdata(client);
 187
 188         mutex_lock(&data->update_lock);
 189
 190         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 191                 int i, j;
 192
 193                 dev_dbg(&client->dev, "Updating data.\n");
 194
 195                 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
 196                 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
 197                 for (; i < j; i++) {
 198                         data->in[i] = lm87_read_value(client,
 199                                       LM87_REG_IN(i));
 200                         data->in_min[i] = lm87_read_value(client,
 201                                           LM87_REG_IN_MIN(i));
 202                         data->in_max[i] = lm87_read_value(client,
 203                                           LM87_REG_IN_MAX(i));
 204                 }
 205
 206                 for (i = 0; i < 2; i++) {
 207                         if (data->channel & CHAN_NO_FAN(i)) {
 208                                 data->in[6+i] = lm87_read_value(client,
 209                                                 LM87_REG_AIN(i));
 210                                 data->in_max[6+i] = lm87_read_value(client,
 211                                                     LM87_REG_AIN_MAX(i));
 212                                 data->in_min[6+i] = lm87_read_value(client,
 213                                                     LM87_REG_AIN_MIN(i));
 214
 215                         } else {
 216                                 data->fan[i] = lm87_read_value(client,
 217                                                LM87_REG_FAN(i));
 218                                 data->fan_min[i] = lm87_read_value(client,
 219                                                    LM87_REG_FAN_MIN(i));
 220                         }
 221                 }
 222
 223                 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
 224                 for (i = 0 ; i < j; i++) {
 225                         data->temp[i] = lm87_read_value(client,
 226                                         LM87_REG_TEMP[i]);
 227                         data->temp_high[i] = lm87_read_value(client,
 228                                              LM87_REG_TEMP_HIGH[i]);
 229                         data->temp_low[i] = lm87_read_value(client,
 230                                             LM87_REG_TEMP_LOW[i]);
 231                 }
 232
 233                 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
 234                 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
 235                 data->temp_crit_int = min(i, j);
 236
 237                 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
 238                 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
 239                 data->temp_crit_ext = min(i, j);
 240
 241                 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 242                 data->fan_div[0] = (i >> 4) & 0x03;
 243                 data->fan_div[1] = (i >> 6) & 0x03;
 244                 data->vid = (i & 0x0F)
 245                           | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
 246                              << 4;
 247
 248                 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
 249                              | (lm87_read_value(client, LM87_REG_ALARMS2)
 250                                 << 8);
 251                 data->aout = lm87_read_value(client, LM87_REG_AOUT);
 252
 253                 data->last_updated = jiffies;
 254                 data->valid = 1;
 255         }
 256
 257         mutex_unlock(&data->update_lock);
 258
 259         return data;
 260 }
 261
 262 /*
 263  * Sysfs stuff
 264  */
 265
 266 static ssize_t in_input_show(struct device *dev,
 267                              struct device_attribute *attr, char *buf)
 268 {
 269         struct lm87_data *data = lm87_update_device(dev);
 270         int nr = to_sensor_dev_attr(attr)->index;
 271
 272         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
 273                        data->in_scale[nr]));
 274 }
 275
 276 static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
 277                            char *buf)
 278 {
 279         struct lm87_data *data = lm87_update_device(dev);
 280         int nr = to_sensor_dev_attr(attr)->index;
 281
 282         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
 283                        data->in_scale[nr]));
 284 }
 285
 286 static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
 287                            char *buf)
 288 {
 289         struct lm87_data *data = lm87_update_device(dev);
 290         int nr = to_sensor_dev_attr(attr)->index;
 291
 292         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
 293                        data->in_scale[nr]));
 294 }
 295
 296 static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
 297                             const char *buf, size_t count)
 298 {
 299         struct i2c_client *client = dev_get_drvdata(dev);
 300         struct lm87_data *data = i2c_get_clientdata(client);
 301         int nr = to_sensor_dev_attr(attr)->index;
 302         long val;
 303         int err;
 304
 305         err = kstrtol(buf, 10, &val);
 306         if (err)
 307                 return err;
 308
 309         mutex_lock(&data->update_lock);
 310         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
 311         lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
 312                          LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
 313         mutex_unlock(&data->update_lock);
 314         return count;
 315 }
 316
 317 static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
 318                             const char *buf, size_t count)
 319 {
 320         struct i2c_client *client = dev_get_drvdata(dev);
 321         struct lm87_data *data = i2c_get_clientdata(client);
 322         int nr = to_sensor_dev_attr(attr)->index;
 323         long val;
 324         int err;
 325
 326         err = kstrtol(buf, 10, &val);
 327         if (err)
 328                 return err;
 329
 330         mutex_lock(&data->update_lock);
 331         data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
 332         lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
 333                          LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
 334         mutex_unlock(&data->update_lock);
 335         return count;
 336 }
 337
 338 static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0);
 339 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
 340 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
 341 static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1);
 342 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
 343 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
 344 static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2);
 345 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
 346 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
 347 static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3);
 348 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
 349 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
 350 static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4);
 351 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
 352 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
 353 static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5);
 354 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
 355 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
 356 static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6);
 357 static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
 358 static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
 359 static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7);
 360 static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
 361 static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
 362
 363 static ssize_t temp_input_show(struct device *dev,
 364                                struct device_attribute *attr, char *buf)
 365 {
 366         struct lm87_data *data = lm87_update_device(dev);
 367         int nr = to_sensor_dev_attr(attr)->index;
 368
 369         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 370 }
 371
 372 static ssize_t temp_low_show(struct device *dev,
 373                              struct device_attribute *attr, char *buf)
 374 {
 375         struct lm87_data *data = lm87_update_device(dev);
 376         int nr = to_sensor_dev_attr(attr)->index;
 377
 378         return sprintf(buf, "%d\n",
 379                        TEMP_FROM_REG(data->temp_low[nr]));
 380 }
 381
 382 static ssize_t temp_high_show(struct device *dev,
 383                               struct device_attribute *attr, char *buf)
 384 {
 385         struct lm87_data *data = lm87_update_device(dev);
 386         int nr = to_sensor_dev_attr(attr)->index;
 387
 388         return sprintf(buf, "%d\n",
 389                        TEMP_FROM_REG(data->temp_high[nr]));
 390 }
 391
 392 static ssize_t temp_low_store(struct device *dev,
 393                               struct device_attribute *attr, const char *buf,
 394                               size_t count)
 395 {
 396         struct i2c_client *client = dev_get_drvdata(dev);
 397         struct lm87_data *data = i2c_get_clientdata(client);
 398         int nr = to_sensor_dev_attr(attr)->index;
 399         long val;
 400         int err;
 401
 402         err = kstrtol(buf, 10, &val);
 403         if (err)
 404                 return err;
 405
 406         mutex_lock(&data->update_lock);
 407         data->temp_low[nr] = TEMP_TO_REG(val);
 408         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
 409         mutex_unlock(&data->update_lock);
 410         return count;
 411 }
 412
 413 static ssize_t temp_high_store(struct device *dev,
 414                                struct device_attribute *attr, const char *buf,
 415                                size_t count)
 416 {
 417         struct i2c_client *client = dev_get_drvdata(dev);
 418         struct lm87_data *data = i2c_get_clientdata(client);
 419         int nr = to_sensor_dev_attr(attr)->index;
 420         long val;
 421         int err;
 422
 423         err = kstrtol(buf, 10, &val);
 424         if (err)
 425                 return err;
 426
 427         mutex_lock(&data->update_lock);
 428         data->temp_high[nr] = TEMP_TO_REG(val);
 429         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
 430         mutex_unlock(&data->update_lock);
 431         return count;
 432 }
 433
 434 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
 435 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0);
 436 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0);
 437 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
 438 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1);
 439 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1);
 440 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
 441 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2);
 442 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2);
 443
 444 static ssize_t temp1_crit_show(struct device *dev,
 445                                struct device_attribute *attr, char *buf)
 446 {
 447         struct lm87_data *data = lm87_update_device(dev);
 448         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
 449 }
 450
 451 static ssize_t temp2_crit_show(struct device *dev,
 452                                struct device_attribute *attr, char *buf)
 453 {
 454         struct lm87_data *data = lm87_update_device(dev);
 455         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
 456 }
 457
 458 static DEVICE_ATTR_RO(temp1_crit);
 459 static DEVICE_ATTR_RO(temp2_crit);
 460 static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL);
 461
 462 static ssize_t fan_input_show(struct device *dev,
 463                               struct device_attribute *attr, char *buf)
 464 {
 465         struct lm87_data *data = lm87_update_device(dev);
 466         int nr = to_sensor_dev_attr(attr)->index;
 467
 468         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 469                        FAN_DIV_FROM_REG(data->fan_div[nr])));
 470 }
 471
 472 static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
 473                             char *buf)
 474 {
 475         struct lm87_data *data = lm87_update_device(dev);
 476         int nr = to_sensor_dev_attr(attr)->index;
 477
 478         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 479                        FAN_DIV_FROM_REG(data->fan_div[nr])));
 480 }
 481
 482 static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
 483                             char *buf)
 484 {
 485         struct lm87_data *data = lm87_update_device(dev);
 486         int nr = to_sensor_dev_attr(attr)->index;
 487
 488         return sprintf(buf, "%d\n",
 489                        FAN_DIV_FROM_REG(data->fan_div[nr]));
 490 }
 491
 492 static ssize_t fan_min_store(struct device *dev,
 493                              struct device_attribute *attr, const char *buf,
 494                              size_t count)
 495 {
 496         struct i2c_client *client = dev_get_drvdata(dev);
 497         struct lm87_data *data = i2c_get_clientdata(client);
 498         int nr = to_sensor_dev_attr(attr)->index;
 499         long val;
 500         int err;
 501
 502         err = kstrtol(buf, 10, &val);
 503         if (err)
 504                 return err;
 505
 506         mutex_lock(&data->update_lock);
 507         data->fan_min[nr] = FAN_TO_REG(val,
 508                             FAN_DIV_FROM_REG(data->fan_div[nr]));
 509         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
 510         mutex_unlock(&data->update_lock);
 511         return count;
 512 }
 513
 514 /*
 515  * Note: we save and restore the fan minimum here, because its value is
 516  * determined in part by the fan clock divider.  This follows the principle
 517  * of least surprise; the user doesn't expect the fan minimum to change just
 518  * because the divider changed.
 519  */
 520 static ssize_t fan_div_store(struct device *dev,
 521                              struct device_attribute *attr, const char *buf,
 522                              size_t count)
 523 {
 524         struct i2c_client *client = dev_get_drvdata(dev);
 525         struct lm87_data *data = i2c_get_clientdata(client);
 526         int nr = to_sensor_dev_attr(attr)->index;
 527         long val;
 528         int err;
 529         unsigned long min;
 530         u8 reg;
 531
 532         err = kstrtol(buf, 10, &val);
 533         if (err)
 534                 return err;
 535
 536         mutex_lock(&data->update_lock);
 537         min = FAN_FROM_REG(data->fan_min[nr],
 538                            FAN_DIV_FROM_REG(data->fan_div[nr]));
 539
 540         switch (val) {
 541         case 1:
 542                 data->fan_div[nr] = 0;
 543                 break;
 544         case 2:
 545                 data->fan_div[nr] = 1;
 546                 break;
 547         case 4:
 548                 data->fan_div[nr] = 2;
 549                 break;
 550         case 8:
 551                 data->fan_div[nr] = 3;
 552                 break;
 553         default:
 554                 mutex_unlock(&data->update_lock);
 555                 return -EINVAL;
 556         }
 557
 558         reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 559         switch (nr) {
 560         case 0:
 561             reg = (reg & 0xCF) | (data->fan_div[0] << 4);
 562             break;
 563         case 1:
 564             reg = (reg & 0x3F) | (data->fan_div[1] << 6);
 565             break;
 566         }
 567         lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
 568
 569         data->fan_min[nr] = FAN_TO_REG(min, val);
 570         lm87_write_value(client, LM87_REG_FAN_MIN(nr),
 571                          data->fan_min[nr]);
 572         mutex_unlock(&data->update_lock);
 573
 574         return count;
 575 }
 576
 577 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
 578 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
 579 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
 580 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
 581 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
 582 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
 583
 584 static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
 585                            char *buf)
 586 {
 587         struct lm87_data *data = lm87_update_device(dev);
 588         return sprintf(buf, "%d\n", data->alarms);
 589 }
 590 static DEVICE_ATTR_RO(alarms);
 591
 592 static ssize_t cpu0_vid_show(struct device *dev,
 593                              struct device_attribute *attr, char *buf)
 594 {
 595         struct lm87_data *data = lm87_update_device(dev);
 596         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 597 }
 598 static DEVICE_ATTR_RO(cpu0_vid);
 599
 600 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
 601                         char *buf)
 602 {
 603         struct lm87_data *data = dev_get_drvdata(dev);
 604         return sprintf(buf, "%d\n", data->vrm);
 605 }
 606 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
 607                          const char *buf, size_t count)
 608 {
 609         struct lm87_data *data = dev_get_drvdata(dev);
 610         unsigned long val;
 611         int err;
 612
 613         err = kstrtoul(buf, 10, &val);
 614         if (err)
 615                 return err;
 616
 617         if (val > 255)
 618                 return -EINVAL;
 619
 620         data->vrm = val;
 621         return count;
 622 }
 623 static DEVICE_ATTR_RW(vrm);
 624
 625 static ssize_t aout_output_show(struct device *dev,
 626                                 struct device_attribute *attr, char *buf)
 627 {
 628         struct lm87_data *data = lm87_update_device(dev);
 629         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 630 }
 631 static ssize_t aout_output_store(struct device *dev,
 632                                  struct device_attribute *attr,
 633                                  const char *buf, size_t count)
 634 {
 635         struct i2c_client *client = dev_get_drvdata(dev);
 636         struct lm87_data *data = i2c_get_clientdata(client);
 637         long val;
 638         int err;
 639
 640         err = kstrtol(buf, 10, &val);
 641         if (err)
 642                 return err;
 643
 644         mutex_lock(&data->update_lock);
 645         data->aout = AOUT_TO_REG(val);
 646         lm87_write_value(client, LM87_REG_AOUT, data->aout);
 647         mutex_unlock(&data->update_lock);
 648         return count;
 649 }
 650 static DEVICE_ATTR_RW(aout_output);
 651
 652 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 653                           char *buf)
 654 {
 655         struct lm87_data *data = lm87_update_device(dev);
 656         int bitnr = to_sensor_dev_attr(attr)->index;
 657         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 658 }
 659 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
 660 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
 661 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
 662 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
 663 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
 664 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
 665 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
 666 static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7);
 667 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
 668 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
 669 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5);
 670 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
 671 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
 672 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14);
 673 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15);
 674
 675 /*
 676  * Real code
 677  */
 678
 679 static struct attribute *lm87_attributes[] = {
 680         &sensor_dev_attr_in1_input.dev_attr.attr,
 681         &sensor_dev_attr_in1_min.dev_attr.attr,
 682         &sensor_dev_attr_in1_max.dev_attr.attr,
 683         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 684         &sensor_dev_attr_in2_input.dev_attr.attr,
 685         &sensor_dev_attr_in2_min.dev_attr.attr,
 686         &sensor_dev_attr_in2_max.dev_attr.attr,
 687         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 688         &sensor_dev_attr_in3_input.dev_attr.attr,
 689         &sensor_dev_attr_in3_min.dev_attr.attr,
 690         &sensor_dev_attr_in3_max.dev_attr.attr,
 691         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 692         &sensor_dev_attr_in4_input.dev_attr.attr,
 693         &sensor_dev_attr_in4_min.dev_attr.attr,
 694         &sensor_dev_attr_in4_max.dev_attr.attr,
 695         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 696
 697         &sensor_dev_attr_temp1_input.dev_attr.attr,
 698         &sensor_dev_attr_temp1_max.dev_attr.attr,
 699         &sensor_dev_attr_temp1_min.dev_attr.attr,
 700         &dev_attr_temp1_crit.attr,
 701         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 702         &sensor_dev_attr_temp2_input.dev_attr.attr,
 703         &sensor_dev_attr_temp2_max.dev_attr.attr,
 704         &sensor_dev_attr_temp2_min.dev_attr.attr,
 705         &dev_attr_temp2_crit.attr,
 706         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 707         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 708
 709         &dev_attr_alarms.attr,
 710         &dev_attr_aout_output.attr,
 711
 712         NULL
 713 };
 714
 715 static const struct attribute_group lm87_group = {
 716         .attrs = lm87_attributes,
 717 };
 718
 719 static struct attribute *lm87_attributes_in6[] = {
 720         &sensor_dev_attr_in6_input.dev_attr.attr,
 721         &sensor_dev_attr_in6_min.dev_attr.attr,
 722         &sensor_dev_attr_in6_max.dev_attr.attr,
 723         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 724         NULL
 725 };
 726
 727 static const struct attribute_group lm87_group_in6 = {
 728         .attrs = lm87_attributes_in6,
 729 };
 730
 731 static struct attribute *lm87_attributes_fan1[] = {
 732         &sensor_dev_attr_fan1_input.dev_attr.attr,
 733         &sensor_dev_attr_fan1_min.dev_attr.attr,
 734         &sensor_dev_attr_fan1_div.dev_attr.attr,
 735         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 736         NULL
 737 };
 738
 739 static const struct attribute_group lm87_group_fan1 = {
 740         .attrs = lm87_attributes_fan1,
 741 };
 742
 743 static struct attribute *lm87_attributes_in7[] = {
 744         &sensor_dev_attr_in7_input.dev_attr.attr,
 745         &sensor_dev_attr_in7_min.dev_attr.attr,
 746         &sensor_dev_attr_in7_max.dev_attr.attr,
 747         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 748         NULL
 749 };
 750
 751 static const struct attribute_group lm87_group_in7 = {
 752         .attrs = lm87_attributes_in7,
 753 };
 754
 755 static struct attribute *lm87_attributes_fan2[] = {
 756         &sensor_dev_attr_fan2_input.dev_attr.attr,
 757         &sensor_dev_attr_fan2_min.dev_attr.attr,
 758         &sensor_dev_attr_fan2_div.dev_attr.attr,
 759         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 760         NULL
 761 };
 762
 763 static const struct attribute_group lm87_group_fan2 = {
 764         .attrs = lm87_attributes_fan2,
 765 };
 766
 767 static struct attribute *lm87_attributes_temp3[] = {
 768         &sensor_dev_attr_temp3_input.dev_attr.attr,
 769         &sensor_dev_attr_temp3_max.dev_attr.attr,
 770         &sensor_dev_attr_temp3_min.dev_attr.attr,
 771         &dev_attr_temp3_crit.attr,
 772         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 773         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 774         NULL
 775 };
 776
 777 static const struct attribute_group lm87_group_temp3 = {
 778         .attrs = lm87_attributes_temp3,
 779 };
 780
 781 static struct attribute *lm87_attributes_in0_5[] = {
 782         &sensor_dev_attr_in0_input.dev_attr.attr,
 783         &sensor_dev_attr_in0_min.dev_attr.attr,
 784         &sensor_dev_attr_in0_max.dev_attr.attr,
 785         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 786         &sensor_dev_attr_in5_input.dev_attr.attr,
 787         &sensor_dev_attr_in5_min.dev_attr.attr,
 788         &sensor_dev_attr_in5_max.dev_attr.attr,
 789         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 790         NULL
 791 };
 792
 793 static const struct attribute_group lm87_group_in0_5 = {
 794         .attrs = lm87_attributes_in0_5,
 795 };
 796
 797 static struct attribute *lm87_attributes_vid[] = {
 798         &dev_attr_cpu0_vid.attr,
 799         &dev_attr_vrm.attr,
 800         NULL
 801 };
 802
 803 static const struct attribute_group lm87_group_vid = {
 804         .attrs = lm87_attributes_vid,
 805 };
 806
 807 /* Return 0 if detection is successful, -ENODEV otherwise */
 808 static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
 809 {
 810         struct i2c_adapter *adapter = client->adapter;
 811         const char *name;
 812         u8 cid, rev;
 813
 814         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 815                 return -ENODEV;
 816
 817         if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
 818                 return -ENODEV;
 819
 820         /* Now, we do the remaining detection. */
 821         cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
 822         rev = lm87_read_value(client, LM87_REG_REVISION);
 823
 824         if (cid == 0x02                 /* National Semiconductor */
 825          && (rev >= 0x01 && rev <= 0x08))
 826                 name = "lm87";
 827         else if (cid == 0x41            /* Analog Devices */
 828               && (rev & 0xf0) == 0x10)
 829                 name = "adm1024";
 830         else {
 831                 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
 832                         client->addr);
 833                 return -ENODEV;
 834         }
 835
 836         strlcpy(info->type, name, I2C_NAME_SIZE);
 837
 838         return 0;
 839 }
 840
 841 static void lm87_restore_config(void *arg)
 842 {
 843         struct i2c_client *client = arg;
 844         struct lm87_data *data = i2c_get_clientdata(client);
 845
 846         lm87_write_value(client, LM87_REG_CONFIG, data->config);
 847 }
 848
 849 static int lm87_init_client(struct i2c_client *client)
 850 {
 851         struct lm87_data *data = i2c_get_clientdata(client);
 852         int rc;
 853         struct device_node *of_node = client->dev.of_node;
 854         u8 val = 0;
 855         struct regulator *vcc = NULL;
 856
 857         if (of_node) {
 858                 if (of_property_read_bool(of_node, "has-temp3"))
 859                         val |= CHAN_TEMP3;
 860                 if (of_property_read_bool(of_node, "has-in6"))
 861                         val |= CHAN_NO_FAN(0);
 862                 if (of_property_read_bool(of_node, "has-in7"))
 863                         val |= CHAN_NO_FAN(1);
 864                 vcc = devm_regulator_get_optional(&client->dev, "vcc");
 865                 if (!IS_ERR(vcc)) {
 866                         if (regulator_get_voltage(vcc) == 5000000)
 867                                 val |= CHAN_VCC_5V;
 868                 }
 869                 data->channel = val;
 870                 lm87_write_value(client,
 871                                 LM87_REG_CHANNEL_MODE, data->channel);
 872         } else if (dev_get_platdata(&client->dev)) {
 873                 data->channel = *(u8 *)dev_get_platdata(&client->dev);
 874                 lm87_write_value(client,
 875                                  LM87_REG_CHANNEL_MODE, data->channel);
 876         } else {
 877                 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
 878         }
 879         data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
 880
 881         rc = devm_add_action(&client->dev, lm87_restore_config, client);
 882         if (rc)
 883                 return rc;
 884
 885         if (!(data->config & 0x01)) {
 886                 int i;
 887
 888                 /* Limits are left uninitialized after power-up */
 889                 for (i = 1; i < 6; i++) {
 890                         lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
 891                         lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
 892                 }
 893                 for (i = 0; i < 2; i++) {
 894                         lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
 895                         lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
 896                         lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
 897                         lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
 898                 }
 899                 if (data->channel & CHAN_TEMP3) {
 900                         lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
 901                         lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
 902                 } else {
 903                         lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
 904                         lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
 905                 }
 906         }
 907
 908         /* Make sure Start is set and INT#_Clear is clear */
 909         if ((data->config & 0x09) != 0x01)
 910                 lm87_write_value(client, LM87_REG_CONFIG,
 911                                  (data->config & 0x77) | 0x01);
 912         return 0;
 913 }
 914
 915 static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
 916 {
 917         struct lm87_data *data;
 918         struct device *hwmon_dev;
 919         int err;
 920         unsigned int group_tail = 0;
 921
 922         data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
 923         if (!data)
 924                 return -ENOMEM;
 925
 926         i2c_set_clientdata(client, data);
 927         mutex_init(&data->update_lock);
 928
 929         /* Initialize the LM87 chip */
 930         err = lm87_init_client(client);
 931         if (err)
 932                 return err;
 933
 934         data->in_scale[0] = 2500;
 935         data->in_scale[1] = 2700;
 936         data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
 937         data->in_scale[3] = 5000;
 938         data->in_scale[4] = 12000;
 939         data->in_scale[5] = 2700;
 940         data->in_scale[6] = 1875;
 941         data->in_scale[7] = 1875;
 942
 943         /*
 944          * Construct the list of attributes, the list depends on the
 945          * configuration of the chip
 946          */
 947         data->attr_groups[group_tail++] = &lm87_group;
 948         if (data->channel & CHAN_NO_FAN(0))
 949                 data->attr_groups[group_tail++] = &lm87_group_in6;
 950         else
 951                 data->attr_groups[group_tail++] = &lm87_group_fan1;
 952
 953         if (data->channel & CHAN_NO_FAN(1))
 954                 data->attr_groups[group_tail++] = &lm87_group_in7;
 955         else
 956                 data->attr_groups[group_tail++] = &lm87_group_fan2;
 957
 958         if (data->channel & CHAN_TEMP3)
 959                 data->attr_groups[group_tail++] = &lm87_group_temp3;
 960         else
 961                 data->attr_groups[group_tail++] = &lm87_group_in0_5;
 962
 963         if (!(data->channel & CHAN_NO_VID)) {
 964                 data->vrm = vid_which_vrm();
 965                 data->attr_groups[group_tail++] = &lm87_group_vid;
 966         }
 967
 968         hwmon_dev = devm_hwmon_device_register_with_groups(
 969             &client->dev, client->name, client, data->attr_groups);
 970         return PTR_ERR_OR_ZERO(hwmon_dev);
 971 }
 972
 973 /*
 974  * Driver data (common to all clients)
 975  */
 976
 977 static const struct i2c_device_id lm87_id[] = {
 978         { "lm87", 0 },
 979         { "adm1024", 0 },
 980         { }
 981 };
 982 MODULE_DEVICE_TABLE(i2c, lm87_id);
 983
 984 static const struct of_device_id lm87_of_match[] = {
 985         { .compatible = "ti,lm87" },
 986         { .compatible = "adi,adm1024" },
 987         { },
 988 };
 989 MODULE_DEVICE_TABLE(of, lm87_of_match);
 990
 991 static struct i2c_driver lm87_driver = {
 992         .class          = I2C_CLASS_HWMON,
 993         .driver = {
 994                 .name   = "lm87",
 995                 .of_match_table = lm87_of_match,
 996         },
 997         .probe          = lm87_probe,
 998         .id_table       = lm87_id,
 999         .detect         = lm87_detect,
1000         .address_list   = normal_i2c,
1001 };
1002
1003 module_i2c_driver(lm87_driver);
1004
1005 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");
1006 MODULE_DESCRIPTION("LM87 driver");
1007 MODULE_LICENSE("GPL");