linux/drivers/hwmon/lm87.c
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   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
  63static 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
  78static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  79static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  80static 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
 142struct 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
 173static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 174{
 175        return i2c_smbus_read_byte_data(client, reg);
 176}
 177
 178static 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
 183static 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
 266static 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
 276static 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
 286static 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
 296static 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
 317static 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
 338static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0);
 339static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
 340static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
 341static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1);
 342static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
 343static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
 344static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2);
 345static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
 346static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
 347static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3);
 348static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
 349static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
 350static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4);
 351static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
 352static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
 353static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5);
 354static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
 355static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
 356static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6);
 357static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
 358static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
 359static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7);
 360static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
 361static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
 362
 363static 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
 372static 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
 382static 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
 392static 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
 413static 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
 434static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
 435static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0);
 436static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0);
 437static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
 438static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1);
 439static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1);
 440static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
 441static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2);
 442static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2);
 443
 444static 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
 451static 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
 458static DEVICE_ATTR_RO(temp1_crit);
 459static DEVICE_ATTR_RO(temp2_crit);
 460static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL);
 461
 462static 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
 472static 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
 482static 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
 492static 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 */
 520static 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
 577static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
 578static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
 579static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
 580static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
 581static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
 582static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
 583
 584static 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}
 590static DEVICE_ATTR_RO(alarms);
 591
 592static 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}
 598static DEVICE_ATTR_RO(cpu0_vid);
 599
 600static 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}
 606static 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}
 623static DEVICE_ATTR_RW(vrm);
 624
 625static 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}
 631static 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}
 650static DEVICE_ATTR_RW(aout_output);
 651
 652static 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}
 659static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
 660static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
 661static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
 662static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
 663static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
 664static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
 665static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
 666static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7);
 667static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
 668static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
 669static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5);
 670static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
 671static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
 672static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14);
 673static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15);
 674
 675/*
 676 * Real code
 677 */
 678
 679static 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
 715static const struct attribute_group lm87_group = {
 716        .attrs = lm87_attributes,
 717};
 718
 719static 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
 727static const struct attribute_group lm87_group_in6 = {
 728        .attrs = lm87_attributes_in6,
 729};
 730
 731static 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
 739static const struct attribute_group lm87_group_fan1 = {
 740        .attrs = lm87_attributes_fan1,
 741};
 742
 743static 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
 751static const struct attribute_group lm87_group_in7 = {
 752        .attrs = lm87_attributes_in7,
 753};
 754
 755static 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
 763static const struct attribute_group lm87_group_fan2 = {
 764        .attrs = lm87_attributes_fan2,
 765};
 766
 767static 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
 777static const struct attribute_group lm87_group_temp3 = {
 778        .attrs = lm87_attributes_temp3,
 779};
 780
 781static 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
 793static const struct attribute_group lm87_group_in0_5 = {
 794        .attrs = lm87_attributes_in0_5,
 795};
 796
 797static struct attribute *lm87_attributes_vid[] = {
 798        &dev_attr_cpu0_vid.attr,
 799        &dev_attr_vrm.attr,
 800        NULL
 801};
 802
 803static const struct attribute_group lm87_group_vid = {
 804        .attrs = lm87_attributes_vid,
 805};
 806
 807/* Return 0 if detection is successful, -ENODEV otherwise */
 808static 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
 841static 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
 849static 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
 915static 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
 977static const struct i2c_device_id lm87_id[] = {
 978        { "lm87", 0 },
 979        { "adm1024", 0 },
 980        { }
 981};
 982MODULE_DEVICE_TABLE(i2c, lm87_id);
 983
 984static const struct of_device_id lm87_of_match[] = {
 985        { .compatible = "ti,lm87" },
 986        { .compatible = "adi,adm1024" },
 987        { },
 988};
 989MODULE_DEVICE_TABLE(of, lm87_of_match);
 990
 991static 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
1003module_i2c_driver(lm87_driver);
1004
1005MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");
1006MODULE_DESCRIPTION("LM87 driver");
1007MODULE_LICENSE("GPL");
1008