linux/drivers/hwmon/lm87.c
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   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 <khali@linux-fr.org>
   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
  70/*
  71 * Addresses to scan
  72 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
  73 */
  74
  75static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  76
  77enum chips { lm87, adm1024 };
  78
  79/*
  80 * The LM87 registers
  81 */
  82
  83/* nr in 0..5 */
  84#define LM87_REG_IN(nr)                 (0x20 + (nr))
  85#define LM87_REG_IN_MAX(nr)             (0x2B + (nr) * 2)
  86#define LM87_REG_IN_MIN(nr)             (0x2C + (nr) * 2)
  87/* nr in 0..1 */
  88#define LM87_REG_AIN(nr)                (0x28 + (nr))
  89#define LM87_REG_AIN_MIN(nr)            (0x1A + (nr))
  90#define LM87_REG_AIN_MAX(nr)            (0x3B + (nr))
  91
  92static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  93static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  94static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  95
  96#define LM87_REG_TEMP_HW_INT_LOCK       0x13
  97#define LM87_REG_TEMP_HW_EXT_LOCK       0x14
  98#define LM87_REG_TEMP_HW_INT            0x17
  99#define LM87_REG_TEMP_HW_EXT            0x18
 100
 101/* nr in 0..1 */
 102#define LM87_REG_FAN(nr)                (0x28 + (nr))
 103#define LM87_REG_FAN_MIN(nr)            (0x3B + (nr))
 104#define LM87_REG_AOUT                   0x19
 105
 106#define LM87_REG_CONFIG                 0x40
 107#define LM87_REG_CHANNEL_MODE           0x16
 108#define LM87_REG_VID_FAN_DIV            0x47
 109#define LM87_REG_VID4                   0x49
 110
 111#define LM87_REG_ALARMS1                0x41
 112#define LM87_REG_ALARMS2                0x42
 113
 114#define LM87_REG_COMPANY_ID             0x3E
 115#define LM87_REG_REVISION               0x3F
 116
 117/*
 118 * Conversions and various macros
 119 * The LM87 uses signed 8-bit values for temperatures.
 120 */
 121
 122#define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
 123#define IN_TO_REG(val, scale)   ((val) <= 0 ? 0 : \
 124                                 (val) * 192 >= (scale) * 255 ? 255 : \
 125                                 ((val) * 192 + (scale) / 2) / (scale))
 126
 127#define TEMP_FROM_REG(reg)      ((reg) * 1000)
 128#define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 129                                 (val) >= 126500 ? 127 : \
 130                                 (((val) < 0 ? (val) - 500 : \
 131                                   (val) + 500) / 1000))
 132
 133#define FAN_FROM_REG(reg, div)  ((reg) == 255 || (reg) == 0 ? 0 : \
 134                                 (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
 135#define FAN_TO_REG(val, div)    ((val) * (div) * 255 <= 1350000 ? 255 : \
 136                                 (1350000 + (val)*(div) / 2) / ((val) * (div)))
 137
 138#define FAN_DIV_FROM_REG(reg)   (1 << (reg))
 139
 140/* analog out is 9.80mV/LSB */
 141#define AOUT_FROM_REG(reg)      (((reg) * 98 + 5) / 10)
 142#define AOUT_TO_REG(val)        ((val) <= 0 ? 0 : \
 143                                 (val) >= 2500 ? 255 : \
 144                                 ((val) * 10 + 49) / 98)
 145
 146/* nr in 0..1 */
 147#define CHAN_NO_FAN(nr)         (1 << (nr))
 148#define CHAN_TEMP3              (1 << 2)
 149#define CHAN_VCC_5V             (1 << 3)
 150#define CHAN_NO_VID             (1 << 7)
 151
 152/*
 153 * Client data (each client gets its own)
 154 */
 155
 156struct lm87_data {
 157        struct device *hwmon_dev;
 158        struct mutex update_lock;
 159        char valid; /* zero until following fields are valid */
 160        unsigned long last_updated; /* In jiffies */
 161
 162        u8 channel;             /* register value */
 163        u8 config;              /* original register value */
 164
 165        u8 in[8];               /* register value */
 166        u8 in_max[8];           /* register value */
 167        u8 in_min[8];           /* register value */
 168        u16 in_scale[8];
 169
 170        s8 temp[3];             /* register value */
 171        s8 temp_high[3];        /* register value */
 172        s8 temp_low[3];         /* register value */
 173        s8 temp_crit_int;       /* min of two register values */
 174        s8 temp_crit_ext;       /* min of two register values */
 175
 176        u8 fan[2];              /* register value */
 177        u8 fan_min[2];          /* register value */
 178        u8 fan_div[2];          /* register value, shifted right */
 179        u8 aout;                /* register value */
 180
 181        u16 alarms;             /* register values, combined */
 182        u8 vid;                 /* register values, combined */
 183        u8 vrm;
 184};
 185
 186static inline int lm87_read_value(struct i2c_client *client, u8 reg)
 187{
 188        return i2c_smbus_read_byte_data(client, reg);
 189}
 190
 191static 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
 196static struct lm87_data *lm87_update_device(struct device *dev)
 197{
 198        struct i2c_client *client = to_i2c_client(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
 279static ssize_t show_in_input(struct device *dev, struct device_attribute *attr,
 280                             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
 289static ssize_t show_in_min(struct device *dev,
 290                                     struct device_attribute *attr, 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
 299static ssize_t show_in_max(struct device *dev,
 300                                     struct device_attribute *attr, 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
 309static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 310                          const char *buf, size_t count)
 311{
 312        struct i2c_client *client = to_i2c_client(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
 330static ssize_t set_in_max(struct device *dev,  struct device_attribute *attr,
 331                          const char *buf, size_t count)
 332{
 333        struct i2c_client *client = to_i2c_client(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#define set_in(offset) \
 352static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 353                show_in_input, NULL, offset); \
 354static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
 355                show_in_min, set_in_min, offset); \
 356static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
 357                show_in_max, set_in_max, offset)
 358set_in(0);
 359set_in(1);
 360set_in(2);
 361set_in(3);
 362set_in(4);
 363set_in(5);
 364set_in(6);
 365set_in(7);
 366
 367static ssize_t show_temp_input(struct device *dev,
 368                               struct device_attribute *attr, char *buf)
 369{
 370        struct lm87_data *data = lm87_update_device(dev);
 371        int nr = to_sensor_dev_attr(attr)->index;
 372
 373        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 374}
 375
 376static ssize_t show_temp_low(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",
 383                       TEMP_FROM_REG(data->temp_low[nr]));
 384}
 385
 386static ssize_t show_temp_high(struct device *dev,
 387                              struct device_attribute *attr, char *buf)
 388{
 389        struct lm87_data *data = lm87_update_device(dev);
 390        int nr = to_sensor_dev_attr(attr)->index;
 391
 392        return sprintf(buf, "%d\n",
 393                       TEMP_FROM_REG(data->temp_high[nr]));
 394}
 395
 396static ssize_t set_temp_low(struct device *dev, struct device_attribute *attr,
 397                            const char *buf, size_t count)
 398{
 399        struct i2c_client *client = to_i2c_client(dev);
 400        struct lm87_data *data = i2c_get_clientdata(client);
 401        int nr = to_sensor_dev_attr(attr)->index;
 402        long val;
 403        int err;
 404
 405        err = kstrtol(buf, 10, &val);
 406        if (err)
 407                return err;
 408
 409        mutex_lock(&data->update_lock);
 410        data->temp_low[nr] = TEMP_TO_REG(val);
 411        lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
 412        mutex_unlock(&data->update_lock);
 413        return count;
 414}
 415
 416static ssize_t set_temp_high(struct device *dev, struct device_attribute *attr,
 417                             const char *buf, size_t count)
 418{
 419        struct i2c_client *client = to_i2c_client(dev);
 420        struct lm87_data *data = i2c_get_clientdata(client);
 421        int nr = to_sensor_dev_attr(attr)->index;
 422        long val;
 423        int err;
 424
 425        err = kstrtol(buf, 10, &val);
 426        if (err)
 427                return err;
 428
 429        mutex_lock(&data->update_lock);
 430        data->temp_high[nr] = TEMP_TO_REG(val);
 431        lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
 432        mutex_unlock(&data->update_lock);
 433        return count;
 434}
 435
 436#define set_temp(offset) \
 437static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 438                show_temp_input, NULL, offset - 1); \
 439static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
 440                show_temp_high, set_temp_high, offset - 1); \
 441static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
 442                show_temp_low, set_temp_low, offset - 1)
 443set_temp(1);
 444set_temp(2);
 445set_temp(3);
 446
 447static ssize_t show_temp_crit_int(struct device *dev,
 448                                  struct device_attribute *attr, char *buf)
 449{
 450        struct lm87_data *data = lm87_update_device(dev);
 451        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
 452}
 453
 454static ssize_t show_temp_crit_ext(struct device *dev,
 455                                  struct device_attribute *attr, char *buf)
 456{
 457        struct lm87_data *data = lm87_update_device(dev);
 458        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
 459}
 460
 461static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
 462static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
 463static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
 464
 465static ssize_t show_fan_input(struct device *dev,
 466                              struct device_attribute *attr, char *buf)
 467{
 468        struct lm87_data *data = lm87_update_device(dev);
 469        int nr = to_sensor_dev_attr(attr)->index;
 470
 471        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 472                       FAN_DIV_FROM_REG(data->fan_div[nr])));
 473}
 474
 475static ssize_t show_fan_min(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_min[nr],
 482                       FAN_DIV_FROM_REG(data->fan_div[nr])));
 483}
 484
 485static ssize_t show_fan_div(struct device *dev,
 486                            struct device_attribute *attr, 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",
 492                       FAN_DIV_FROM_REG(data->fan_div[nr]));
 493}
 494
 495static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 496                           const char *buf, size_t count)
 497{
 498        struct i2c_client *client = to_i2c_client(dev);
 499        struct lm87_data *data = i2c_get_clientdata(client);
 500        int nr = to_sensor_dev_attr(attr)->index;
 501        long val;
 502        int err;
 503
 504        err = kstrtol(buf, 10, &val);
 505        if (err)
 506                return err;
 507
 508        mutex_lock(&data->update_lock);
 509        data->fan_min[nr] = FAN_TO_REG(val,
 510                            FAN_DIV_FROM_REG(data->fan_div[nr]));
 511        lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
 512        mutex_unlock(&data->update_lock);
 513        return count;
 514}
 515
 516/*
 517 * Note: we save and restore the fan minimum here, because its value is
 518 * determined in part by the fan clock divider.  This follows the principle
 519 * of least surprise; the user doesn't expect the fan minimum to change just
 520 * because the divider changed.
 521 */
 522static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 523                           const char *buf, size_t count)
 524{
 525        struct i2c_client *client = to_i2c_client(dev);
 526        struct lm87_data *data = i2c_get_clientdata(client);
 527        int nr = to_sensor_dev_attr(attr)->index;
 528        long val;
 529        int err;
 530        unsigned long min;
 531        u8 reg;
 532
 533        err = kstrtol(buf, 10, &val);
 534        if (err)
 535                return err;
 536
 537        mutex_lock(&data->update_lock);
 538        min = FAN_FROM_REG(data->fan_min[nr],
 539                           FAN_DIV_FROM_REG(data->fan_div[nr]));
 540
 541        switch (val) {
 542        case 1:
 543                data->fan_div[nr] = 0;
 544                break;
 545        case 2:
 546                data->fan_div[nr] = 1;
 547                break;
 548        case 4:
 549                data->fan_div[nr] = 2;
 550                break;
 551        case 8:
 552                data->fan_div[nr] = 3;
 553                break;
 554        default:
 555                mutex_unlock(&data->update_lock);
 556                return -EINVAL;
 557        }
 558
 559        reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
 560        switch (nr) {
 561        case 0:
 562            reg = (reg & 0xCF) | (data->fan_div[0] << 4);
 563            break;
 564        case 1:
 565            reg = (reg & 0x3F) | (data->fan_div[1] << 6);
 566            break;
 567        }
 568        lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
 569
 570        data->fan_min[nr] = FAN_TO_REG(min, val);
 571        lm87_write_value(client, LM87_REG_FAN_MIN(nr),
 572                         data->fan_min[nr]);
 573        mutex_unlock(&data->update_lock);
 574
 575        return count;
 576}
 577
 578#define set_fan(offset) \
 579static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
 580                show_fan_input, NULL, offset - 1); \
 581static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 582                show_fan_min, set_fan_min, offset - 1); \
 583static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 584                show_fan_div, set_fan_div, offset - 1)
 585set_fan(1);
 586set_fan(2);
 587
 588static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
 589                           char *buf)
 590{
 591        struct lm87_data *data = lm87_update_device(dev);
 592        return sprintf(buf, "%d\n", data->alarms);
 593}
 594static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 595
 596static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
 597                        char *buf)
 598{
 599        struct lm87_data *data = lm87_update_device(dev);
 600        return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 601}
 602static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 603
 604static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
 605                        char *buf)
 606{
 607        struct lm87_data *data = dev_get_drvdata(dev);
 608        return sprintf(buf, "%d\n", data->vrm);
 609}
 610static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 611                       const char *buf, size_t count)
 612{
 613        struct lm87_data *data = dev_get_drvdata(dev);
 614        unsigned long val;
 615        int err;
 616
 617        err = kstrtoul(buf, 10, &val);
 618        if (err)
 619                return err;
 620        data->vrm = val;
 621        return count;
 622}
 623static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 624
 625static ssize_t show_aout(struct device *dev, struct device_attribute *attr,
 626                         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 set_aout(struct device *dev, struct device_attribute *attr,
 632                        const char *buf, size_t count)
 633{
 634        struct i2c_client *client = to_i2c_client(dev);
 635        struct lm87_data *data = i2c_get_clientdata(client);
 636        long val;
 637        int err;
 638
 639        err = kstrtol(buf, 10, &val);
 640        if (err)
 641                return err;
 642
 643        mutex_lock(&data->update_lock);
 644        data->aout = AOUT_TO_REG(val);
 645        lm87_write_value(client, LM87_REG_AOUT, data->aout);
 646        mutex_unlock(&data->update_lock);
 647        return count;
 648}
 649static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 650
 651static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 652                          char *buf)
 653{
 654        struct lm87_data *data = lm87_update_device(dev);
 655        int bitnr = to_sensor_dev_attr(attr)->index;
 656        return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 657}
 658static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 659static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 660static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 661static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 662static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 663static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 664static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
 665static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
 666static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 667static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 668static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
 669static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 670static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 671static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
 672static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
 673
 674/*
 675 * Real code
 676 */
 677
 678static struct attribute *lm87_attributes[] = {
 679        &sensor_dev_attr_in1_input.dev_attr.attr,
 680        &sensor_dev_attr_in1_min.dev_attr.attr,
 681        &sensor_dev_attr_in1_max.dev_attr.attr,
 682        &sensor_dev_attr_in1_alarm.dev_attr.attr,
 683        &sensor_dev_attr_in2_input.dev_attr.attr,
 684        &sensor_dev_attr_in2_min.dev_attr.attr,
 685        &sensor_dev_attr_in2_max.dev_attr.attr,
 686        &sensor_dev_attr_in2_alarm.dev_attr.attr,
 687        &sensor_dev_attr_in3_input.dev_attr.attr,
 688        &sensor_dev_attr_in3_min.dev_attr.attr,
 689        &sensor_dev_attr_in3_max.dev_attr.attr,
 690        &sensor_dev_attr_in3_alarm.dev_attr.attr,
 691        &sensor_dev_attr_in4_input.dev_attr.attr,
 692        &sensor_dev_attr_in4_min.dev_attr.attr,
 693        &sensor_dev_attr_in4_max.dev_attr.attr,
 694        &sensor_dev_attr_in4_alarm.dev_attr.attr,
 695
 696        &sensor_dev_attr_temp1_input.dev_attr.attr,
 697        &sensor_dev_attr_temp1_max.dev_attr.attr,
 698        &sensor_dev_attr_temp1_min.dev_attr.attr,
 699        &dev_attr_temp1_crit.attr,
 700        &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 701        &sensor_dev_attr_temp2_input.dev_attr.attr,
 702        &sensor_dev_attr_temp2_max.dev_attr.attr,
 703        &sensor_dev_attr_temp2_min.dev_attr.attr,
 704        &dev_attr_temp2_crit.attr,
 705        &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 706        &sensor_dev_attr_temp2_fault.dev_attr.attr,
 707
 708        &dev_attr_alarms.attr,
 709        &dev_attr_aout_output.attr,
 710
 711        NULL
 712};
 713
 714static const struct attribute_group lm87_group = {
 715        .attrs = lm87_attributes,
 716};
 717
 718static struct attribute *lm87_attributes_in6[] = {
 719        &sensor_dev_attr_in6_input.dev_attr.attr,
 720        &sensor_dev_attr_in6_min.dev_attr.attr,
 721        &sensor_dev_attr_in6_max.dev_attr.attr,
 722        &sensor_dev_attr_in6_alarm.dev_attr.attr,
 723        NULL
 724};
 725
 726static const struct attribute_group lm87_group_in6 = {
 727        .attrs = lm87_attributes_in6,
 728};
 729
 730static struct attribute *lm87_attributes_fan1[] = {
 731        &sensor_dev_attr_fan1_input.dev_attr.attr,
 732        &sensor_dev_attr_fan1_min.dev_attr.attr,
 733        &sensor_dev_attr_fan1_div.dev_attr.attr,
 734        &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 735        NULL
 736};
 737
 738static const struct attribute_group lm87_group_fan1 = {
 739        .attrs = lm87_attributes_fan1,
 740};
 741
 742static struct attribute *lm87_attributes_in7[] = {
 743        &sensor_dev_attr_in7_input.dev_attr.attr,
 744        &sensor_dev_attr_in7_min.dev_attr.attr,
 745        &sensor_dev_attr_in7_max.dev_attr.attr,
 746        &sensor_dev_attr_in7_alarm.dev_attr.attr,
 747        NULL
 748};
 749
 750static const struct attribute_group lm87_group_in7 = {
 751        .attrs = lm87_attributes_in7,
 752};
 753
 754static struct attribute *lm87_attributes_fan2[] = {
 755        &sensor_dev_attr_fan2_input.dev_attr.attr,
 756        &sensor_dev_attr_fan2_min.dev_attr.attr,
 757        &sensor_dev_attr_fan2_div.dev_attr.attr,
 758        &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 759        NULL
 760};
 761
 762static const struct attribute_group lm87_group_fan2 = {
 763        .attrs = lm87_attributes_fan2,
 764};
 765
 766static struct attribute *lm87_attributes_temp3[] = {
 767        &sensor_dev_attr_temp3_input.dev_attr.attr,
 768        &sensor_dev_attr_temp3_max.dev_attr.attr,
 769        &sensor_dev_attr_temp3_min.dev_attr.attr,
 770        &dev_attr_temp3_crit.attr,
 771        &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 772        &sensor_dev_attr_temp3_fault.dev_attr.attr,
 773        NULL
 774};
 775
 776static const struct attribute_group lm87_group_temp3 = {
 777        .attrs = lm87_attributes_temp3,
 778};
 779
 780static struct attribute *lm87_attributes_in0_5[] = {
 781        &sensor_dev_attr_in0_input.dev_attr.attr,
 782        &sensor_dev_attr_in0_min.dev_attr.attr,
 783        &sensor_dev_attr_in0_max.dev_attr.attr,
 784        &sensor_dev_attr_in0_alarm.dev_attr.attr,
 785        &sensor_dev_attr_in5_input.dev_attr.attr,
 786        &sensor_dev_attr_in5_min.dev_attr.attr,
 787        &sensor_dev_attr_in5_max.dev_attr.attr,
 788        &sensor_dev_attr_in5_alarm.dev_attr.attr,
 789        NULL
 790};
 791
 792static const struct attribute_group lm87_group_in0_5 = {
 793        .attrs = lm87_attributes_in0_5,
 794};
 795
 796static struct attribute *lm87_attributes_vid[] = {
 797        &dev_attr_cpu0_vid.attr,
 798        &dev_attr_vrm.attr,
 799        NULL
 800};
 801
 802static const struct attribute_group lm87_group_vid = {
 803        .attrs = lm87_attributes_vid,
 804};
 805
 806/* Return 0 if detection is successful, -ENODEV otherwise */
 807static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
 808{
 809        struct i2c_adapter *adapter = client->adapter;
 810        const char *name;
 811        u8 cid, rev;
 812
 813        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 814                return -ENODEV;
 815
 816        if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
 817                return -ENODEV;
 818
 819        /* Now, we do the remaining detection. */
 820        cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
 821        rev = lm87_read_value(client, LM87_REG_REVISION);
 822
 823        if (cid == 0x02                 /* National Semiconductor */
 824         && (rev >= 0x01 && rev <= 0x08))
 825                name = "lm87";
 826        else if (cid == 0x41            /* Analog Devices */
 827              && (rev & 0xf0) == 0x10)
 828                name = "adm1024";
 829        else {
 830                dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
 831                        client->addr);
 832                return -ENODEV;
 833        }
 834
 835        strlcpy(info->type, name, I2C_NAME_SIZE);
 836
 837        return 0;
 838}
 839
 840static void lm87_remove_files(struct i2c_client *client)
 841{
 842        struct device *dev = &client->dev;
 843
 844        sysfs_remove_group(&dev->kobj, &lm87_group);
 845        sysfs_remove_group(&dev->kobj, &lm87_group_in6);
 846        sysfs_remove_group(&dev->kobj, &lm87_group_fan1);
 847        sysfs_remove_group(&dev->kobj, &lm87_group_in7);
 848        sysfs_remove_group(&dev->kobj, &lm87_group_fan2);
 849        sysfs_remove_group(&dev->kobj, &lm87_group_temp3);
 850        sysfs_remove_group(&dev->kobj, &lm87_group_in0_5);
 851        sysfs_remove_group(&dev->kobj, &lm87_group_vid);
 852}
 853
 854static void lm87_init_client(struct i2c_client *client)
 855{
 856        struct lm87_data *data = i2c_get_clientdata(client);
 857
 858        if (client->dev.platform_data) {
 859                data->channel = *(u8 *)client->dev.platform_data;
 860                lm87_write_value(client,
 861                                 LM87_REG_CHANNEL_MODE, data->channel);
 862        } else {
 863                data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
 864        }
 865        data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
 866
 867        if (!(data->config & 0x01)) {
 868                int i;
 869
 870                /* Limits are left uninitialized after power-up */
 871                for (i = 1; i < 6; i++) {
 872                        lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
 873                        lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
 874                }
 875                for (i = 0; i < 2; i++) {
 876                        lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
 877                        lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
 878                        lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
 879                        lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
 880                }
 881                if (data->channel & CHAN_TEMP3) {
 882                        lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
 883                        lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
 884                } else {
 885                        lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
 886                        lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
 887                }
 888        }
 889
 890        /* Make sure Start is set and INT#_Clear is clear */
 891        if ((data->config & 0x09) != 0x01)
 892                lm87_write_value(client, LM87_REG_CONFIG,
 893                                 (data->config & 0x77) | 0x01);
 894}
 895
 896static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
 897{
 898        struct lm87_data *data;
 899        int err;
 900
 901        data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
 902        if (!data)
 903                return -ENOMEM;
 904
 905        i2c_set_clientdata(client, data);
 906        data->valid = 0;
 907        mutex_init(&data->update_lock);
 908
 909        /* Initialize the LM87 chip */
 910        lm87_init_client(client);
 911
 912        data->in_scale[0] = 2500;
 913        data->in_scale[1] = 2700;
 914        data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
 915        data->in_scale[3] = 5000;
 916        data->in_scale[4] = 12000;
 917        data->in_scale[5] = 2700;
 918        data->in_scale[6] = 1875;
 919        data->in_scale[7] = 1875;
 920
 921        /* Register sysfs hooks */
 922        err = sysfs_create_group(&client->dev.kobj, &lm87_group);
 923        if (err)
 924                goto exit_stop;
 925
 926        if (data->channel & CHAN_NO_FAN(0)) {
 927                err = sysfs_create_group(&client->dev.kobj, &lm87_group_in6);
 928                if (err)
 929                        goto exit_remove;
 930        } else {
 931                err = sysfs_create_group(&client->dev.kobj, &lm87_group_fan1);
 932                if (err)
 933                        goto exit_remove;
 934        }
 935
 936        if (data->channel & CHAN_NO_FAN(1)) {
 937                err = sysfs_create_group(&client->dev.kobj, &lm87_group_in7);
 938                if (err)
 939                        goto exit_remove;
 940        } else {
 941                err = sysfs_create_group(&client->dev.kobj, &lm87_group_fan2);
 942                if (err)
 943                        goto exit_remove;
 944        }
 945
 946        if (data->channel & CHAN_TEMP3) {
 947                err = sysfs_create_group(&client->dev.kobj, &lm87_group_temp3);
 948                if (err)
 949                        goto exit_remove;
 950        } else {
 951                err = sysfs_create_group(&client->dev.kobj, &lm87_group_in0_5);
 952                if (err)
 953                        goto exit_remove;
 954        }
 955
 956        if (!(data->channel & CHAN_NO_VID)) {
 957                data->vrm = vid_which_vrm();
 958                err = sysfs_create_group(&client->dev.kobj, &lm87_group_vid);
 959                if (err)
 960                        goto exit_remove;
 961        }
 962
 963        data->hwmon_dev = hwmon_device_register(&client->dev);
 964        if (IS_ERR(data->hwmon_dev)) {
 965                err = PTR_ERR(data->hwmon_dev);
 966                goto exit_remove;
 967        }
 968
 969        return 0;
 970
 971exit_remove:
 972        lm87_remove_files(client);
 973exit_stop:
 974        lm87_write_value(client, LM87_REG_CONFIG, data->config);
 975        return err;
 976}
 977
 978static int lm87_remove(struct i2c_client *client)
 979{
 980        struct lm87_data *data = i2c_get_clientdata(client);
 981
 982        hwmon_device_unregister(data->hwmon_dev);
 983        lm87_remove_files(client);
 984
 985        lm87_write_value(client, LM87_REG_CONFIG, data->config);
 986        return 0;
 987}
 988
 989/*
 990 * Driver data (common to all clients)
 991 */
 992
 993static const struct i2c_device_id lm87_id[] = {
 994        { "lm87", lm87 },
 995        { "adm1024", adm1024 },
 996        { }
 997};
 998MODULE_DEVICE_TABLE(i2c, lm87_id);
 999
1000static struct i2c_driver lm87_driver = {
1001        .class          = I2C_CLASS_HWMON,
1002        .driver = {
1003                .name   = "lm87",
1004        },
1005        .probe          = lm87_probe,
1006        .remove         = lm87_remove,
1007        .id_table       = lm87_id,
1008        .detect         = lm87_detect,
1009        .address_list   = normal_i2c,
1010};
1011
1012module_i2c_driver(lm87_driver);
1013
1014MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others");
1015MODULE_DESCRIPTION("LM87 driver");
1016MODULE_LICENSE("GPL");
1017
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