linux/drivers/hwmon/emc2103.c
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   1/*
   2 * emc2103.c - Support for SMSC EMC2103
   3 * Copyright (c) 2010 SMSC
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20#include <linux/module.h>
  21#include <linux/init.h>
  22#include <linux/slab.h>
  23#include <linux/jiffies.h>
  24#include <linux/i2c.h>
  25#include <linux/hwmon.h>
  26#include <linux/hwmon-sysfs.h>
  27#include <linux/err.h>
  28#include <linux/mutex.h>
  29
  30/* Addresses scanned */
  31static const unsigned short normal_i2c[] = { 0x2E, I2C_CLIENT_END };
  32
  33static const u8 REG_TEMP[4] = { 0x00, 0x02, 0x04, 0x06 };
  34static const u8 REG_TEMP_MIN[4] = { 0x3c, 0x38, 0x39, 0x3a };
  35static const u8 REG_TEMP_MAX[4] = { 0x34, 0x30, 0x31, 0x32 };
  36
  37#define REG_CONF1               0x20
  38#define REG_TEMP_MAX_ALARM      0x24
  39#define REG_TEMP_MIN_ALARM      0x25
  40#define REG_FAN_CONF1           0x42
  41#define REG_FAN_TARGET_LO       0x4c
  42#define REG_FAN_TARGET_HI       0x4d
  43#define REG_FAN_TACH_HI         0x4e
  44#define REG_FAN_TACH_LO         0x4f
  45#define REG_PRODUCT_ID          0xfd
  46#define REG_MFG_ID              0xfe
  47
  48/* equation 4 from datasheet: rpm = (3932160 * multipler) / count */
  49#define FAN_RPM_FACTOR          3932160
  50
  51/*
  52 * 2103-2 and 2103-4's 3rd temperature sensor can be connected to two diodes
  53 * in anti-parallel mode, and in this configuration both can be read
  54 * independently (so we have 4 temperature inputs).  The device can't
  55 * detect if it's connected in this mode, so we have to manually enable
  56 * it.  Default is to leave the device in the state it's already in (-1).
  57 * This parameter allows APD mode to be optionally forced on or off
  58 */
  59static int apd = -1;
  60module_param(apd, bint, 0);
  61MODULE_PARM_DESC(init, "Set to zero to disable anti-parallel diode mode");
  62
  63struct temperature {
  64        s8      degrees;
  65        u8      fraction;       /* 0-7 multiples of 0.125 */
  66};
  67
  68struct emc2103_data {
  69        struct device           *hwmon_dev;
  70        struct mutex            update_lock;
  71        bool                    valid;          /* registers are valid */
  72        bool                    fan_rpm_control;
  73        int                     temp_count;     /* num of temp sensors */
  74        unsigned long           last_updated;   /* in jiffies */
  75        struct temperature      temp[4];        /* internal + 3 external */
  76        s8                      temp_min[4];    /* no fractional part */
  77        s8                      temp_max[4];    /* no fractional part */
  78        u8                      temp_min_alarm;
  79        u8                      temp_max_alarm;
  80        u8                      fan_multiplier;
  81        u16                     fan_tach;
  82        u16                     fan_target;
  83};
  84
  85static int read_u8_from_i2c(struct i2c_client *client, u8 i2c_reg, u8 *output)
  86{
  87        int status = i2c_smbus_read_byte_data(client, i2c_reg);
  88        if (status < 0) {
  89                dev_warn(&client->dev, "reg 0x%02x, err %d\n",
  90                        i2c_reg, status);
  91        } else {
  92                *output = status;
  93        }
  94        return status;
  95}
  96
  97static void read_temp_from_i2c(struct i2c_client *client, u8 i2c_reg,
  98                               struct temperature *temp)
  99{
 100        u8 degrees, fractional;
 101
 102        if (read_u8_from_i2c(client, i2c_reg, &degrees) < 0)
 103                return;
 104
 105        if (read_u8_from_i2c(client, i2c_reg + 1, &fractional) < 0)
 106                return;
 107
 108        temp->degrees = degrees;
 109        temp->fraction = (fractional & 0xe0) >> 5;
 110}
 111
 112static void read_fan_from_i2c(struct i2c_client *client, u16 *output,
 113                              u8 hi_addr, u8 lo_addr)
 114{
 115        u8 high_byte, lo_byte;
 116
 117        if (read_u8_from_i2c(client, hi_addr, &high_byte) < 0)
 118                return;
 119
 120        if (read_u8_from_i2c(client, lo_addr, &lo_byte) < 0)
 121                return;
 122
 123        *output = ((u16)high_byte << 5) | (lo_byte >> 3);
 124}
 125
 126static void write_fan_target_to_i2c(struct i2c_client *client, u16 new_target)
 127{
 128        u8 high_byte = (new_target & 0x1fe0) >> 5;
 129        u8 low_byte = (new_target & 0x001f) << 3;
 130        i2c_smbus_write_byte_data(client, REG_FAN_TARGET_LO, low_byte);
 131        i2c_smbus_write_byte_data(client, REG_FAN_TARGET_HI, high_byte);
 132}
 133
 134static void read_fan_config_from_i2c(struct i2c_client *client)
 135
 136{
 137        struct emc2103_data *data = i2c_get_clientdata(client);
 138        u8 conf1;
 139
 140        if (read_u8_from_i2c(client, REG_FAN_CONF1, &conf1) < 0)
 141                return;
 142
 143        data->fan_multiplier = 1 << ((conf1 & 0x60) >> 5);
 144        data->fan_rpm_control = (conf1 & 0x80) != 0;
 145}
 146
 147static struct emc2103_data *emc2103_update_device(struct device *dev)
 148{
 149        struct i2c_client *client = to_i2c_client(dev);
 150        struct emc2103_data *data = i2c_get_clientdata(client);
 151
 152        mutex_lock(&data->update_lock);
 153
 154        if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 155            || !data->valid) {
 156                int i;
 157
 158                for (i = 0; i < data->temp_count; i++) {
 159                        read_temp_from_i2c(client, REG_TEMP[i], &data->temp[i]);
 160                        read_u8_from_i2c(client, REG_TEMP_MIN[i],
 161                                &data->temp_min[i]);
 162                        read_u8_from_i2c(client, REG_TEMP_MAX[i],
 163                                &data->temp_max[i]);
 164                }
 165
 166                read_u8_from_i2c(client, REG_TEMP_MIN_ALARM,
 167                        &data->temp_min_alarm);
 168                read_u8_from_i2c(client, REG_TEMP_MAX_ALARM,
 169                        &data->temp_max_alarm);
 170
 171                read_fan_from_i2c(client, &data->fan_tach,
 172                        REG_FAN_TACH_HI, REG_FAN_TACH_LO);
 173                read_fan_from_i2c(client, &data->fan_target,
 174                        REG_FAN_TARGET_HI, REG_FAN_TARGET_LO);
 175                read_fan_config_from_i2c(client);
 176
 177                data->last_updated = jiffies;
 178                data->valid = true;
 179        }
 180
 181        mutex_unlock(&data->update_lock);
 182
 183        return data;
 184}
 185
 186static ssize_t
 187show_temp(struct device *dev, struct device_attribute *da, char *buf)
 188{
 189        int nr = to_sensor_dev_attr(da)->index;
 190        struct emc2103_data *data = emc2103_update_device(dev);
 191        int millidegrees = data->temp[nr].degrees * 1000
 192                + data->temp[nr].fraction * 125;
 193        return sprintf(buf, "%d\n", millidegrees);
 194}
 195
 196static ssize_t
 197show_temp_min(struct device *dev, struct device_attribute *da, char *buf)
 198{
 199        int nr = to_sensor_dev_attr(da)->index;
 200        struct emc2103_data *data = emc2103_update_device(dev);
 201        int millidegrees = data->temp_min[nr] * 1000;
 202        return sprintf(buf, "%d\n", millidegrees);
 203}
 204
 205static ssize_t
 206show_temp_max(struct device *dev, struct device_attribute *da, char *buf)
 207{
 208        int nr = to_sensor_dev_attr(da)->index;
 209        struct emc2103_data *data = emc2103_update_device(dev);
 210        int millidegrees = data->temp_max[nr] * 1000;
 211        return sprintf(buf, "%d\n", millidegrees);
 212}
 213
 214static ssize_t
 215show_temp_fault(struct device *dev, struct device_attribute *da, char *buf)
 216{
 217        int nr = to_sensor_dev_attr(da)->index;
 218        struct emc2103_data *data = emc2103_update_device(dev);
 219        bool fault = (data->temp[nr].degrees == -128);
 220        return sprintf(buf, "%d\n", fault ? 1 : 0);
 221}
 222
 223static ssize_t
 224show_temp_min_alarm(struct device *dev, struct device_attribute *da, char *buf)
 225{
 226        int nr = to_sensor_dev_attr(da)->index;
 227        struct emc2103_data *data = emc2103_update_device(dev);
 228        bool alarm = data->temp_min_alarm & (1 << nr);
 229        return sprintf(buf, "%d\n", alarm ? 1 : 0);
 230}
 231
 232static ssize_t
 233show_temp_max_alarm(struct device *dev, struct device_attribute *da, char *buf)
 234{
 235        int nr = to_sensor_dev_attr(da)->index;
 236        struct emc2103_data *data = emc2103_update_device(dev);
 237        bool alarm = data->temp_max_alarm & (1 << nr);
 238        return sprintf(buf, "%d\n", alarm ? 1 : 0);
 239}
 240
 241static ssize_t set_temp_min(struct device *dev, struct device_attribute *da,
 242                            const char *buf, size_t count)
 243{
 244        int nr = to_sensor_dev_attr(da)->index;
 245        struct i2c_client *client = to_i2c_client(dev);
 246        struct emc2103_data *data = i2c_get_clientdata(client);
 247        long val;
 248
 249        int result = kstrtol(buf, 10, &val);
 250        if (result < 0)
 251                return -EINVAL;
 252
 253        val = DIV_ROUND_CLOSEST(val, 1000);
 254        if ((val < -63) || (val > 127))
 255                return -EINVAL;
 256
 257        mutex_lock(&data->update_lock);
 258        data->temp_min[nr] = val;
 259        i2c_smbus_write_byte_data(client, REG_TEMP_MIN[nr], val);
 260        mutex_unlock(&data->update_lock);
 261
 262        return count;
 263}
 264
 265static ssize_t set_temp_max(struct device *dev, struct device_attribute *da,
 266                            const char *buf, size_t count)
 267{
 268        int nr = to_sensor_dev_attr(da)->index;
 269        struct i2c_client *client = to_i2c_client(dev);
 270        struct emc2103_data *data = i2c_get_clientdata(client);
 271        long val;
 272
 273        int result = kstrtol(buf, 10, &val);
 274        if (result < 0)
 275                return -EINVAL;
 276
 277        val = DIV_ROUND_CLOSEST(val, 1000);
 278        if ((val < -63) || (val > 127))
 279                return -EINVAL;
 280
 281        mutex_lock(&data->update_lock);
 282        data->temp_max[nr] = val;
 283        i2c_smbus_write_byte_data(client, REG_TEMP_MAX[nr], val);
 284        mutex_unlock(&data->update_lock);
 285
 286        return count;
 287}
 288
 289static ssize_t
 290show_fan(struct device *dev, struct device_attribute *da, char *buf)
 291{
 292        struct emc2103_data *data = emc2103_update_device(dev);
 293        int rpm = 0;
 294        if (data->fan_tach != 0)
 295                rpm = (FAN_RPM_FACTOR * data->fan_multiplier) / data->fan_tach;
 296        return sprintf(buf, "%d\n", rpm);
 297}
 298
 299static ssize_t
 300show_fan_div(struct device *dev, struct device_attribute *da, char *buf)
 301{
 302        struct emc2103_data *data = emc2103_update_device(dev);
 303        int fan_div = 8 / data->fan_multiplier;
 304        return sprintf(buf, "%d\n", fan_div);
 305}
 306
 307/*
 308 * Note: we also update the fan target here, because its value is
 309 * determined in part by the fan clock divider.  This follows the principle
 310 * of least surprise; the user doesn't expect the fan target to change just
 311 * because the divider changed.
 312 */
 313static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
 314                           const char *buf, size_t count)
 315{
 316        struct emc2103_data *data = emc2103_update_device(dev);
 317        struct i2c_client *client = to_i2c_client(dev);
 318        int new_range_bits, old_div = 8 / data->fan_multiplier;
 319        long new_div;
 320
 321        int status = kstrtol(buf, 10, &new_div);
 322        if (status < 0)
 323                return -EINVAL;
 324
 325        if (new_div == old_div) /* No change */
 326                return count;
 327
 328        switch (new_div) {
 329        case 1:
 330                new_range_bits = 3;
 331                break;
 332        case 2:
 333                new_range_bits = 2;
 334                break;
 335        case 4:
 336                new_range_bits = 1;
 337                break;
 338        case 8:
 339                new_range_bits = 0;
 340                break;
 341        default:
 342                return -EINVAL;
 343        }
 344
 345        mutex_lock(&data->update_lock);
 346
 347        status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1);
 348        if (status < 0) {
 349                dev_dbg(&client->dev, "reg 0x%02x, err %d\n",
 350                        REG_FAN_CONF1, status);
 351                mutex_unlock(&data->update_lock);
 352                return -EIO;
 353        }
 354        status &= 0x9F;
 355        status |= (new_range_bits << 5);
 356        i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status);
 357
 358        data->fan_multiplier = 8 / new_div;
 359
 360        /* update fan target if high byte is not disabled */
 361        if ((data->fan_target & 0x1fe0) != 0x1fe0) {
 362                u16 new_target = (data->fan_target * old_div) / new_div;
 363                data->fan_target = min(new_target, (u16)0x1fff);
 364                write_fan_target_to_i2c(client, data->fan_target);
 365        }
 366
 367        /* invalidate data to force re-read from hardware */
 368        data->valid = false;
 369
 370        mutex_unlock(&data->update_lock);
 371        return count;
 372}
 373
 374static ssize_t
 375show_fan_target(struct device *dev, struct device_attribute *da, char *buf)
 376{
 377        struct emc2103_data *data = emc2103_update_device(dev);
 378        int rpm = 0;
 379
 380        /* high byte of 0xff indicates disabled so return 0 */
 381        if ((data->fan_target != 0) && ((data->fan_target & 0x1fe0) != 0x1fe0))
 382                rpm = (FAN_RPM_FACTOR * data->fan_multiplier)
 383                        / data->fan_target;
 384
 385        return sprintf(buf, "%d\n", rpm);
 386}
 387
 388static ssize_t set_fan_target(struct device *dev, struct device_attribute *da,
 389                              const char *buf, size_t count)
 390{
 391        struct emc2103_data *data = emc2103_update_device(dev);
 392        struct i2c_client *client = to_i2c_client(dev);
 393        long rpm_target;
 394
 395        int result = kstrtol(buf, 10, &rpm_target);
 396        if (result < 0)
 397                return -EINVAL;
 398
 399        /* Datasheet states 16384 as maximum RPM target (table 3.2) */
 400        if ((rpm_target < 0) || (rpm_target > 16384))
 401                return -EINVAL;
 402
 403        mutex_lock(&data->update_lock);
 404
 405        if (rpm_target == 0)
 406                data->fan_target = 0x1fff;
 407        else
 408                data->fan_target = SENSORS_LIMIT(
 409                        (FAN_RPM_FACTOR * data->fan_multiplier) / rpm_target,
 410                        0, 0x1fff);
 411
 412        write_fan_target_to_i2c(client, data->fan_target);
 413
 414        mutex_unlock(&data->update_lock);
 415        return count;
 416}
 417
 418static ssize_t
 419show_fan_fault(struct device *dev, struct device_attribute *da, char *buf)
 420{
 421        struct emc2103_data *data = emc2103_update_device(dev);
 422        bool fault = ((data->fan_tach & 0x1fe0) == 0x1fe0);
 423        return sprintf(buf, "%d\n", fault ? 1 : 0);
 424}
 425
 426static ssize_t
 427show_pwm_enable(struct device *dev, struct device_attribute *da, char *buf)
 428{
 429        struct emc2103_data *data = emc2103_update_device(dev);
 430        return sprintf(buf, "%d\n", data->fan_rpm_control ? 3 : 0);
 431}
 432
 433static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *da,
 434                              const char *buf, size_t count)
 435{
 436        struct i2c_client *client = to_i2c_client(dev);
 437        struct emc2103_data *data = i2c_get_clientdata(client);
 438        long new_value;
 439        u8 conf_reg;
 440
 441        int result = kstrtol(buf, 10, &new_value);
 442        if (result < 0)
 443                return -EINVAL;
 444
 445        mutex_lock(&data->update_lock);
 446        switch (new_value) {
 447        case 0:
 448                data->fan_rpm_control = false;
 449                break;
 450        case 3:
 451                data->fan_rpm_control = true;
 452                break;
 453        default:
 454                count = -EINVAL;
 455                goto err;
 456        }
 457
 458        result = read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg);
 459        if (result) {
 460                count = result;
 461                goto err;
 462        }
 463
 464        if (data->fan_rpm_control)
 465                conf_reg |= 0x80;
 466        else
 467                conf_reg &= ~0x80;
 468
 469        i2c_smbus_write_byte_data(client, REG_FAN_CONF1, conf_reg);
 470err:
 471        mutex_unlock(&data->update_lock);
 472        return count;
 473}
 474
 475static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 476static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, show_temp_min,
 477        set_temp_min, 0);
 478static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp_max,
 479        set_temp_max, 0);
 480static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
 481static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_temp_min_alarm,
 482        NULL, 0);
 483static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_temp_max_alarm,
 484        NULL, 0);
 485
 486static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 487static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, show_temp_min,
 488        set_temp_min, 1);
 489static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, show_temp_max,
 490        set_temp_max, 1);
 491static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
 492static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_temp_min_alarm,
 493        NULL, 1);
 494static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_temp_max_alarm,
 495        NULL, 1);
 496
 497static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 498static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR, show_temp_min,
 499        set_temp_min, 2);
 500static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR, show_temp_max,
 501        set_temp_max, 2);
 502static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
 503static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_temp_min_alarm,
 504        NULL, 2);
 505static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_temp_max_alarm,
 506        NULL, 2);
 507
 508static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
 509static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR, show_temp_min,
 510        set_temp_min, 3);
 511static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO | S_IWUSR, show_temp_max,
 512        set_temp_max, 3);
 513static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
 514static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_temp_min_alarm,
 515        NULL, 3);
 516static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_temp_max_alarm,
 517        NULL, 3);
 518
 519static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL);
 520static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, show_fan_div, set_fan_div);
 521static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_fan_target,
 522        set_fan_target);
 523static DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL);
 524
 525static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
 526        set_pwm_enable);
 527
 528/* sensors present on all models */
 529static struct attribute *emc2103_attributes[] = {
 530        &sensor_dev_attr_temp1_input.dev_attr.attr,
 531        &sensor_dev_attr_temp1_min.dev_attr.attr,
 532        &sensor_dev_attr_temp1_max.dev_attr.attr,
 533        &sensor_dev_attr_temp1_fault.dev_attr.attr,
 534        &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 535        &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 536        &sensor_dev_attr_temp2_input.dev_attr.attr,
 537        &sensor_dev_attr_temp2_min.dev_attr.attr,
 538        &sensor_dev_attr_temp2_max.dev_attr.attr,
 539        &sensor_dev_attr_temp2_fault.dev_attr.attr,
 540        &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 541        &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 542        &dev_attr_fan1_input.attr,
 543        &dev_attr_fan1_div.attr,
 544        &dev_attr_fan1_target.attr,
 545        &dev_attr_fan1_fault.attr,
 546        &dev_attr_pwm1_enable.attr,
 547        NULL
 548};
 549
 550/* extra temperature sensors only present on 2103-2 and 2103-4 */
 551static struct attribute *emc2103_attributes_temp3[] = {
 552        &sensor_dev_attr_temp3_input.dev_attr.attr,
 553        &sensor_dev_attr_temp3_min.dev_attr.attr,
 554        &sensor_dev_attr_temp3_max.dev_attr.attr,
 555        &sensor_dev_attr_temp3_fault.dev_attr.attr,
 556        &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 557        &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 558        NULL
 559};
 560
 561/* extra temperature sensors only present on 2103-2 and 2103-4 in APD mode */
 562static struct attribute *emc2103_attributes_temp4[] = {
 563        &sensor_dev_attr_temp4_input.dev_attr.attr,
 564        &sensor_dev_attr_temp4_min.dev_attr.attr,
 565        &sensor_dev_attr_temp4_max.dev_attr.attr,
 566        &sensor_dev_attr_temp4_fault.dev_attr.attr,
 567        &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
 568        &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 569        NULL
 570};
 571
 572static const struct attribute_group emc2103_group = {
 573        .attrs = emc2103_attributes,
 574};
 575
 576static const struct attribute_group emc2103_temp3_group = {
 577        .attrs = emc2103_attributes_temp3,
 578};
 579
 580static const struct attribute_group emc2103_temp4_group = {
 581        .attrs = emc2103_attributes_temp4,
 582};
 583
 584static int
 585emc2103_probe(struct i2c_client *client, const struct i2c_device_id *id)
 586{
 587        struct emc2103_data *data;
 588        int status;
 589
 590        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 591                return -EIO;
 592
 593        data = kzalloc(sizeof(struct emc2103_data), GFP_KERNEL);
 594        if (!data)
 595                return -ENOMEM;
 596
 597        i2c_set_clientdata(client, data);
 598        mutex_init(&data->update_lock);
 599
 600        /* 2103-2 and 2103-4 have 3 external diodes, 2103-1 has 1 */
 601        status = i2c_smbus_read_byte_data(client, REG_PRODUCT_ID);
 602        if (status == 0x24) {
 603                /* 2103-1 only has 1 external diode */
 604                data->temp_count = 2;
 605        } else {
 606                /* 2103-2 and 2103-4 have 3 or 4 external diodes */
 607                status = i2c_smbus_read_byte_data(client, REG_CONF1);
 608                if (status < 0) {
 609                        dev_dbg(&client->dev, "reg 0x%02x, err %d\n", REG_CONF1,
 610                                status);
 611                        goto exit_free;
 612                }
 613
 614                /* detect current state of hardware */
 615                data->temp_count = (status & 0x01) ? 4 : 3;
 616
 617                /* force APD state if module parameter is set */
 618                if (apd == 0) {
 619                        /* force APD mode off */
 620                        data->temp_count = 3;
 621                        status &= ~(0x01);
 622                        i2c_smbus_write_byte_data(client, REG_CONF1, status);
 623                } else if (apd == 1) {
 624                        /* force APD mode on */
 625                        data->temp_count = 4;
 626                        status |= 0x01;
 627                        i2c_smbus_write_byte_data(client, REG_CONF1, status);
 628                }
 629        }
 630
 631        /* Register sysfs hooks */
 632        status = sysfs_create_group(&client->dev.kobj, &emc2103_group);
 633        if (status)
 634                goto exit_free;
 635
 636        if (data->temp_count >= 3) {
 637                status = sysfs_create_group(&client->dev.kobj,
 638                        &emc2103_temp3_group);
 639                if (status)
 640                        goto exit_remove;
 641        }
 642
 643        if (data->temp_count == 4) {
 644                status = sysfs_create_group(&client->dev.kobj,
 645                        &emc2103_temp4_group);
 646                if (status)
 647                        goto exit_remove_temp3;
 648        }
 649
 650        data->hwmon_dev = hwmon_device_register(&client->dev);
 651        if (IS_ERR(data->hwmon_dev)) {
 652                status = PTR_ERR(data->hwmon_dev);
 653                goto exit_remove_temp4;
 654        }
 655
 656        dev_info(&client->dev, "%s: sensor '%s'\n",
 657                 dev_name(data->hwmon_dev), client->name);
 658
 659        return 0;
 660
 661exit_remove_temp4:
 662        if (data->temp_count == 4)
 663                sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group);
 664exit_remove_temp3:
 665        if (data->temp_count >= 3)
 666                sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group);
 667exit_remove:
 668        sysfs_remove_group(&client->dev.kobj, &emc2103_group);
 669exit_free:
 670        kfree(data);
 671        return status;
 672}
 673
 674static int emc2103_remove(struct i2c_client *client)
 675{
 676        struct emc2103_data *data = i2c_get_clientdata(client);
 677
 678        hwmon_device_unregister(data->hwmon_dev);
 679
 680        if (data->temp_count == 4)
 681                sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group);
 682
 683        if (data->temp_count >= 3)
 684                sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group);
 685
 686        sysfs_remove_group(&client->dev.kobj, &emc2103_group);
 687
 688        kfree(data);
 689        return 0;
 690}
 691
 692static const struct i2c_device_id emc2103_ids[] = {
 693        { "emc2103", 0, },
 694        { /* LIST END */ }
 695};
 696MODULE_DEVICE_TABLE(i2c, emc2103_ids);
 697
 698/* Return 0 if detection is successful, -ENODEV otherwise */
 699static int
 700emc2103_detect(struct i2c_client *new_client, struct i2c_board_info *info)
 701{
 702        struct i2c_adapter *adapter = new_client->adapter;
 703        int manufacturer, product;
 704
 705        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 706                return -ENODEV;
 707
 708        manufacturer = i2c_smbus_read_byte_data(new_client, REG_MFG_ID);
 709        if (manufacturer != 0x5D)
 710                return -ENODEV;
 711
 712        product = i2c_smbus_read_byte_data(new_client, REG_PRODUCT_ID);
 713        if ((product != 0x24) && (product != 0x26))
 714                return -ENODEV;
 715
 716        strlcpy(info->type, "emc2103", I2C_NAME_SIZE);
 717
 718        return 0;
 719}
 720
 721static struct i2c_driver emc2103_driver = {
 722        .class          = I2C_CLASS_HWMON,
 723        .driver = {
 724                .name   = "emc2103",
 725        },
 726        .probe          = emc2103_probe,
 727        .remove         = emc2103_remove,
 728        .id_table       = emc2103_ids,
 729        .detect         = emc2103_detect,
 730        .address_list   = normal_i2c,
 731};
 732
 733module_i2c_driver(emc2103_driver);
 734
 735MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
 736MODULE_DESCRIPTION("SMSC EMC2103 hwmon driver");
 737MODULE_LICENSE("GPL");
 738
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