linux/drivers/hwmon/adm9240.c
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   1/*
   2 * adm9240.c    Part of lm_sensors, Linux kernel modules for hardware
   3 *              monitoring
   4 *
   5 * Copyright (C) 1999   Frodo Looijaard <frodol@dds.nl>
   6 *                      Philip Edelbrock <phil@netroedge.com>
   7 * Copyright (C) 2003   Michiel Rook <michiel@grendelproject.nl>
   8 * Copyright (C) 2005   Grant Coady <gcoady.lk@gmail.com> with valuable
   9 *                              guidance from Jean Delvare
  10 *
  11 * Driver supports      Analog Devices          ADM9240
  12 *                      Dallas Semiconductor    DS1780
  13 *                      National Semiconductor  LM81
  14 *
  15 * ADM9240 is the reference, DS1780 and LM81 are register compatibles
  16 *
  17 * Voltage      Six inputs are scaled by chip, VID also reported
  18 * Temperature  Chip temperature to 0.5'C, maximum and max_hysteris
  19 * Fans         2 fans, low speed alarm, automatic fan clock divider
  20 * Alarms       16-bit map of active alarms
  21 * Analog Out   0..1250 mV output
  22 *
  23 * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
  24 *
  25 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
  26 *
  27 * LM81 extended temp reading not implemented
  28 *
  29 * This program is free software; you can redistribute it and/or modify
  30 * it under the terms of the GNU General Public License as published by
  31 * the Free Software Foundation; either version 2 of the License, or
  32 * (at your option) any later version.
  33 *
  34 * This program is distributed in the hope that it will be useful,
  35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  37 * GNU General Public License for more details.
  38 *
  39 * You should have received a copy of the GNU General Public License
  40 * along with this program; if not, write to the Free Software
  41 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  42 */
  43
  44#include <linux/init.h>
  45#include <linux/module.h>
  46#include <linux/slab.h>
  47#include <linux/i2c.h>
  48#include <linux/hwmon-sysfs.h>
  49#include <linux/hwmon.h>
  50#include <linux/hwmon-vid.h>
  51#include <linux/err.h>
  52#include <linux/mutex.h>
  53#include <linux/jiffies.h>
  54
  55/* Addresses to scan */
  56static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
  57                                        I2C_CLIENT_END };
  58
  59enum chips { adm9240, ds1780, lm81 };
  60
  61/* ADM9240 registers */
  62#define ADM9240_REG_MAN_ID              0x3e
  63#define ADM9240_REG_DIE_REV             0x3f
  64#define ADM9240_REG_CONFIG              0x40
  65
  66#define ADM9240_REG_IN(nr)              (0x20 + (nr))   /* 0..5 */
  67#define ADM9240_REG_IN_MAX(nr)          (0x2b + (nr) * 2)
  68#define ADM9240_REG_IN_MIN(nr)          (0x2c + (nr) * 2)
  69#define ADM9240_REG_FAN(nr)             (0x28 + (nr))   /* 0..1 */
  70#define ADM9240_REG_FAN_MIN(nr)         (0x3b + (nr))
  71#define ADM9240_REG_INT(nr)             (0x41 + (nr))
  72#define ADM9240_REG_INT_MASK(nr)        (0x43 + (nr))
  73#define ADM9240_REG_TEMP                0x27
  74#define ADM9240_REG_TEMP_MAX(nr)        (0x39 + (nr)) /* 0, 1 = high, hyst */
  75#define ADM9240_REG_ANALOG_OUT          0x19
  76#define ADM9240_REG_CHASSIS_CLEAR       0x46
  77#define ADM9240_REG_VID_FAN_DIV         0x47
  78#define ADM9240_REG_I2C_ADDR            0x48
  79#define ADM9240_REG_VID4                0x49
  80#define ADM9240_REG_TEMP_CONF           0x4b
  81
  82/* generalised scaling with integer rounding */
  83static inline int SCALE(long val, int mul, int div)
  84{
  85        if (val < 0)
  86                return (val * mul - div / 2) / div;
  87        else
  88                return (val * mul + div / 2) / div;
  89}
  90
  91/* adm9240 internally scales voltage measurements */
  92static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
  93
  94static inline unsigned int IN_FROM_REG(u8 reg, int n)
  95{
  96        return SCALE(reg, nom_mv[n], 192);
  97}
  98
  99static inline u8 IN_TO_REG(unsigned long val, int n)
 100{
 101        return clamp_val(SCALE(val, 192, nom_mv[n]), 0, 255);
 102}
 103
 104/* temperature range: -40..125, 127 disables temperature alarm */
 105static inline s8 TEMP_TO_REG(long val)
 106{
 107        return clamp_val(SCALE(val, 1, 1000), -40, 127);
 108}
 109
 110/* two fans, each with low fan speed limit */
 111static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
 112{
 113        if (!reg) /* error */
 114                return -1;
 115
 116        if (reg == 255)
 117                return 0;
 118
 119        return SCALE(1350000, 1, reg * div);
 120}
 121
 122/* analog out 0..1250mV */
 123static inline u8 AOUT_TO_REG(unsigned long val)
 124{
 125        return clamp_val(SCALE(val, 255, 1250), 0, 255);
 126}
 127
 128static inline unsigned int AOUT_FROM_REG(u8 reg)
 129{
 130        return SCALE(reg, 1250, 255);
 131}
 132
 133static int adm9240_probe(struct i2c_client *client,
 134                         const struct i2c_device_id *id);
 135static int adm9240_detect(struct i2c_client *client,
 136                          struct i2c_board_info *info);
 137static void adm9240_init_client(struct i2c_client *client);
 138static int adm9240_remove(struct i2c_client *client);
 139static struct adm9240_data *adm9240_update_device(struct device *dev);
 140
 141/* driver data */
 142static const struct i2c_device_id adm9240_id[] = {
 143        { "adm9240", adm9240 },
 144        { "ds1780", ds1780 },
 145        { "lm81", lm81 },
 146        { }
 147};
 148MODULE_DEVICE_TABLE(i2c, adm9240_id);
 149
 150static struct i2c_driver adm9240_driver = {
 151        .class          = I2C_CLASS_HWMON,
 152        .driver = {
 153                .name   = "adm9240",
 154        },
 155        .probe          = adm9240_probe,
 156        .remove         = adm9240_remove,
 157        .id_table       = adm9240_id,
 158        .detect         = adm9240_detect,
 159        .address_list   = normal_i2c,
 160};
 161
 162/* per client data */
 163struct adm9240_data {
 164        struct device *hwmon_dev;
 165        struct mutex update_lock;
 166        char valid;
 167        unsigned long last_updated_measure;
 168        unsigned long last_updated_config;
 169
 170        u8 in[6];               /* ro   in0_input */
 171        u8 in_max[6];           /* rw   in0_max */
 172        u8 in_min[6];           /* rw   in0_min */
 173        u8 fan[2];              /* ro   fan1_input */
 174        u8 fan_min[2];          /* rw   fan1_min */
 175        u8 fan_div[2];          /* rw   fan1_div, read-only accessor */
 176        s16 temp;               /* ro   temp1_input, 9-bit sign-extended */
 177        s8 temp_max[2];         /* rw   0 -> temp_max, 1 -> temp_max_hyst */
 178        u16 alarms;             /* ro   alarms */
 179        u8 aout;                /* rw   aout_output */
 180        u8 vid;                 /* ro   vid */
 181        u8 vrm;                 /* --   vrm set on startup, no accessor */
 182};
 183
 184/*** sysfs accessors ***/
 185
 186/* temperature */
 187static ssize_t show_temp(struct device *dev, struct device_attribute *dummy,
 188                char *buf)
 189{
 190        struct adm9240_data *data = adm9240_update_device(dev);
 191        return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */
 192}
 193
 194static ssize_t show_max(struct device *dev, struct device_attribute *devattr,
 195                char *buf)
 196{
 197        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 198        struct adm9240_data *data = adm9240_update_device(dev);
 199        return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
 200}
 201
 202static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
 203                const char *buf, size_t count)
 204{
 205        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 206        struct i2c_client *client = to_i2c_client(dev);
 207        struct adm9240_data *data = i2c_get_clientdata(client);
 208        long val;
 209        int err;
 210
 211        err = kstrtol(buf, 10, &val);
 212        if (err)
 213                return err;
 214
 215        mutex_lock(&data->update_lock);
 216        data->temp_max[attr->index] = TEMP_TO_REG(val);
 217        i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
 218                        data->temp_max[attr->index]);
 219        mutex_unlock(&data->update_lock);
 220        return count;
 221}
 222
 223static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
 224static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
 225                show_max, set_max, 0);
 226static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
 227                show_max, set_max, 1);
 228
 229/* voltage */
 230static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
 231                char *buf)
 232{
 233        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 234        struct adm9240_data *data = adm9240_update_device(dev);
 235        return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
 236                                attr->index));
 237}
 238
 239static ssize_t show_in_min(struct device *dev,
 240                struct device_attribute *devattr, char *buf)
 241{
 242        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 243        struct adm9240_data *data = adm9240_update_device(dev);
 244        return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
 245                                attr->index));
 246}
 247
 248static ssize_t show_in_max(struct device *dev,
 249                struct device_attribute *devattr, char *buf)
 250{
 251        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 252        struct adm9240_data *data = adm9240_update_device(dev);
 253        return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
 254                                attr->index));
 255}
 256
 257static ssize_t set_in_min(struct device *dev,
 258                struct device_attribute *devattr,
 259                const char *buf, size_t count)
 260{
 261        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 262        struct i2c_client *client = to_i2c_client(dev);
 263        struct adm9240_data *data = i2c_get_clientdata(client);
 264        unsigned long val;
 265        int err;
 266
 267        err = kstrtoul(buf, 10, &val);
 268        if (err)
 269                return err;
 270
 271        mutex_lock(&data->update_lock);
 272        data->in_min[attr->index] = IN_TO_REG(val, attr->index);
 273        i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
 274                        data->in_min[attr->index]);
 275        mutex_unlock(&data->update_lock);
 276        return count;
 277}
 278
 279static ssize_t set_in_max(struct device *dev,
 280                struct device_attribute *devattr,
 281                const char *buf, size_t count)
 282{
 283        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 284        struct i2c_client *client = to_i2c_client(dev);
 285        struct adm9240_data *data = i2c_get_clientdata(client);
 286        unsigned long val;
 287        int err;
 288
 289        err = kstrtoul(buf, 10, &val);
 290        if (err)
 291                return err;
 292
 293        mutex_lock(&data->update_lock);
 294        data->in_max[attr->index] = IN_TO_REG(val, attr->index);
 295        i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
 296                        data->in_max[attr->index]);
 297        mutex_unlock(&data->update_lock);
 298        return count;
 299}
 300
 301#define vin(nr)                                                 \
 302static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO,              \
 303                show_in, NULL, nr);                             \
 304static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR,      \
 305                show_in_min, set_in_min, nr);                   \
 306static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR,      \
 307                show_in_max, set_in_max, nr);
 308
 309vin(0);
 310vin(1);
 311vin(2);
 312vin(3);
 313vin(4);
 314vin(5);
 315
 316/* fans */
 317static ssize_t show_fan(struct device *dev,
 318                struct device_attribute *devattr, char *buf)
 319{
 320        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 321        struct adm9240_data *data = adm9240_update_device(dev);
 322        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
 323                                1 << data->fan_div[attr->index]));
 324}
 325
 326static ssize_t show_fan_min(struct device *dev,
 327                struct device_attribute *devattr, char *buf)
 328{
 329        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 330        struct adm9240_data *data = adm9240_update_device(dev);
 331        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
 332                                1 << data->fan_div[attr->index]));
 333}
 334
 335static ssize_t show_fan_div(struct device *dev,
 336                struct device_attribute *devattr, char *buf)
 337{
 338        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 339        struct adm9240_data *data = adm9240_update_device(dev);
 340        return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
 341}
 342
 343/* write new fan div, callers must hold data->update_lock */
 344static void adm9240_write_fan_div(struct i2c_client *client, int nr,
 345                u8 fan_div)
 346{
 347        u8 reg, old, shift = (nr + 2) * 2;
 348
 349        reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
 350        old = (reg >> shift) & 3;
 351        reg &= ~(3 << shift);
 352        reg |= (fan_div << shift);
 353        i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
 354        dev_dbg(&client->dev, "fan%d clock divider changed from %u "
 355                        "to %u\n", nr + 1, 1 << old, 1 << fan_div);
 356}
 357
 358/*
 359 * set fan speed low limit:
 360 *
 361 * - value is zero: disable fan speed low limit alarm
 362 *
 363 * - value is below fan speed measurement range: enable fan speed low
 364 *   limit alarm to be asserted while fan speed too slow to measure
 365 *
 366 * - otherwise: select fan clock divider to suit fan speed low limit,
 367 *   measurement code may adjust registers to ensure fan speed reading
 368 */
 369static ssize_t set_fan_min(struct device *dev,
 370                struct device_attribute *devattr,
 371                const char *buf, size_t count)
 372{
 373        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 374        struct i2c_client *client = to_i2c_client(dev);
 375        struct adm9240_data *data = i2c_get_clientdata(client);
 376        int nr = attr->index;
 377        u8 new_div;
 378        unsigned long val;
 379        int err;
 380
 381        err = kstrtoul(buf, 10, &val);
 382        if (err)
 383                return err;
 384
 385        mutex_lock(&data->update_lock);
 386
 387        if (!val) {
 388                data->fan_min[nr] = 255;
 389                new_div = data->fan_div[nr];
 390
 391                dev_dbg(&client->dev, "fan%u low limit set disabled\n",
 392                                nr + 1);
 393
 394        } else if (val < 1350000 / (8 * 254)) {
 395                new_div = 3;
 396                data->fan_min[nr] = 254;
 397
 398                dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
 399                                nr + 1, FAN_FROM_REG(254, 1 << new_div));
 400
 401        } else {
 402                unsigned int new_min = 1350000 / val;
 403
 404                new_div = 0;
 405                while (new_min > 192 && new_div < 3) {
 406                        new_div++;
 407                        new_min /= 2;
 408                }
 409                if (!new_min) /* keep > 0 */
 410                        new_min++;
 411
 412                data->fan_min[nr] = new_min;
 413
 414                dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
 415                                nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
 416        }
 417
 418        if (new_div != data->fan_div[nr]) {
 419                data->fan_div[nr] = new_div;
 420                adm9240_write_fan_div(client, nr, new_div);
 421        }
 422        i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
 423                        data->fan_min[nr]);
 424
 425        mutex_unlock(&data->update_lock);
 426        return count;
 427}
 428
 429#define fan(nr)                                                 \
 430static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO,             \
 431                show_fan, NULL, nr - 1);                        \
 432static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO,               \
 433                show_fan_div, NULL, nr - 1);                    \
 434static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR,     \
 435                show_fan_min, set_fan_min, nr - 1);
 436
 437fan(1);
 438fan(2);
 439
 440/* alarms */
 441static ssize_t show_alarms(struct device *dev,
 442                struct device_attribute *attr, char *buf)
 443{
 444        struct adm9240_data *data = adm9240_update_device(dev);
 445        return sprintf(buf, "%u\n", data->alarms);
 446}
 447static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 448
 449static ssize_t show_alarm(struct device *dev,
 450                struct device_attribute *attr, char *buf)
 451{
 452        int bitnr = to_sensor_dev_attr(attr)->index;
 453        struct adm9240_data *data = adm9240_update_device(dev);
 454        return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 455}
 456static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 457static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 458static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 459static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 460static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 461static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 462static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 463static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 464static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 465
 466/* vid */
 467static ssize_t show_vid(struct device *dev,
 468                struct device_attribute *attr, char *buf)
 469{
 470        struct adm9240_data *data = adm9240_update_device(dev);
 471        return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 472}
 473static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 474
 475/* analog output */
 476static ssize_t show_aout(struct device *dev,
 477                struct device_attribute *attr, char *buf)
 478{
 479        struct adm9240_data *data = adm9240_update_device(dev);
 480        return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 481}
 482
 483static ssize_t set_aout(struct device *dev,
 484                struct device_attribute *attr,
 485                const char *buf, size_t count)
 486{
 487        struct i2c_client *client = to_i2c_client(dev);
 488        struct adm9240_data *data = i2c_get_clientdata(client);
 489        long val;
 490        int err;
 491
 492        err = kstrtol(buf, 10, &val);
 493        if (err)
 494                return err;
 495
 496        mutex_lock(&data->update_lock);
 497        data->aout = AOUT_TO_REG(val);
 498        i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
 499        mutex_unlock(&data->update_lock);
 500        return count;
 501}
 502static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 503
 504static ssize_t chassis_clear(struct device *dev,
 505                struct device_attribute *attr,
 506                const char *buf, size_t count)
 507{
 508        struct i2c_client *client = to_i2c_client(dev);
 509        struct adm9240_data *data = i2c_get_clientdata(client);
 510        unsigned long val;
 511
 512        if (kstrtoul(buf, 10, &val) || val != 0)
 513                return -EINVAL;
 514
 515        mutex_lock(&data->update_lock);
 516        i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
 517        data->valid = 0;                /* Force cache refresh */
 518        mutex_unlock(&data->update_lock);
 519        dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
 520
 521        return count;
 522}
 523static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm,
 524                chassis_clear, 12);
 525
 526static struct attribute *adm9240_attributes[] = {
 527        &sensor_dev_attr_in0_input.dev_attr.attr,
 528        &sensor_dev_attr_in0_min.dev_attr.attr,
 529        &sensor_dev_attr_in0_max.dev_attr.attr,
 530        &sensor_dev_attr_in0_alarm.dev_attr.attr,
 531        &sensor_dev_attr_in1_input.dev_attr.attr,
 532        &sensor_dev_attr_in1_min.dev_attr.attr,
 533        &sensor_dev_attr_in1_max.dev_attr.attr,
 534        &sensor_dev_attr_in1_alarm.dev_attr.attr,
 535        &sensor_dev_attr_in2_input.dev_attr.attr,
 536        &sensor_dev_attr_in2_min.dev_attr.attr,
 537        &sensor_dev_attr_in2_max.dev_attr.attr,
 538        &sensor_dev_attr_in2_alarm.dev_attr.attr,
 539        &sensor_dev_attr_in3_input.dev_attr.attr,
 540        &sensor_dev_attr_in3_min.dev_attr.attr,
 541        &sensor_dev_attr_in3_max.dev_attr.attr,
 542        &sensor_dev_attr_in3_alarm.dev_attr.attr,
 543        &sensor_dev_attr_in4_input.dev_attr.attr,
 544        &sensor_dev_attr_in4_min.dev_attr.attr,
 545        &sensor_dev_attr_in4_max.dev_attr.attr,
 546        &sensor_dev_attr_in4_alarm.dev_attr.attr,
 547        &sensor_dev_attr_in5_input.dev_attr.attr,
 548        &sensor_dev_attr_in5_min.dev_attr.attr,
 549        &sensor_dev_attr_in5_max.dev_attr.attr,
 550        &sensor_dev_attr_in5_alarm.dev_attr.attr,
 551        &dev_attr_temp1_input.attr,
 552        &sensor_dev_attr_temp1_max.dev_attr.attr,
 553        &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 554        &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 555        &sensor_dev_attr_fan1_input.dev_attr.attr,
 556        &sensor_dev_attr_fan1_div.dev_attr.attr,
 557        &sensor_dev_attr_fan1_min.dev_attr.attr,
 558        &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 559        &sensor_dev_attr_fan2_input.dev_attr.attr,
 560        &sensor_dev_attr_fan2_div.dev_attr.attr,
 561        &sensor_dev_attr_fan2_min.dev_attr.attr,
 562        &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 563        &dev_attr_alarms.attr,
 564        &dev_attr_aout_output.attr,
 565        &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
 566        &dev_attr_cpu0_vid.attr,
 567        NULL
 568};
 569
 570static const struct attribute_group adm9240_group = {
 571        .attrs = adm9240_attributes,
 572};
 573
 574
 575/*** sensor chip detect and driver install ***/
 576
 577/* Return 0 if detection is successful, -ENODEV otherwise */
 578static int adm9240_detect(struct i2c_client *new_client,
 579                          struct i2c_board_info *info)
 580{
 581        struct i2c_adapter *adapter = new_client->adapter;
 582        const char *name = "";
 583        int address = new_client->addr;
 584        u8 man_id, die_rev;
 585
 586        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 587                return -ENODEV;
 588
 589        /* verify chip: reg address should match i2c address */
 590        if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
 591                        != address) {
 592                dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n",
 593                        address);
 594                return -ENODEV;
 595        }
 596
 597        /* check known chip manufacturer */
 598        man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
 599        if (man_id == 0x23) {
 600                name = "adm9240";
 601        } else if (man_id == 0xda) {
 602                name = "ds1780";
 603        } else if (man_id == 0x01) {
 604                name = "lm81";
 605        } else {
 606                dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n",
 607                        man_id);
 608                return -ENODEV;
 609        }
 610
 611        /* successful detect, print chip info */
 612        die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
 613        dev_info(&adapter->dev, "found %s revision %u\n",
 614                 man_id == 0x23 ? "ADM9240" :
 615                 man_id == 0xda ? "DS1780" : "LM81", die_rev);
 616
 617        strlcpy(info->type, name, I2C_NAME_SIZE);
 618
 619        return 0;
 620}
 621
 622static int adm9240_probe(struct i2c_client *new_client,
 623                         const struct i2c_device_id *id)
 624{
 625        struct adm9240_data *data;
 626        int err;
 627
 628        data = devm_kzalloc(&new_client->dev, sizeof(*data), GFP_KERNEL);
 629        if (!data)
 630                return -ENOMEM;
 631
 632        i2c_set_clientdata(new_client, data);
 633        mutex_init(&data->update_lock);
 634
 635        adm9240_init_client(new_client);
 636
 637        /* populate sysfs filesystem */
 638        err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group);
 639        if (err)
 640                return err;
 641
 642        data->hwmon_dev = hwmon_device_register(&new_client->dev);
 643        if (IS_ERR(data->hwmon_dev)) {
 644                err = PTR_ERR(data->hwmon_dev);
 645                goto exit_remove;
 646        }
 647
 648        return 0;
 649
 650exit_remove:
 651        sysfs_remove_group(&new_client->dev.kobj, &adm9240_group);
 652        return err;
 653}
 654
 655static int adm9240_remove(struct i2c_client *client)
 656{
 657        struct adm9240_data *data = i2c_get_clientdata(client);
 658
 659        hwmon_device_unregister(data->hwmon_dev);
 660        sysfs_remove_group(&client->dev.kobj, &adm9240_group);
 661
 662        return 0;
 663}
 664
 665static void adm9240_init_client(struct i2c_client *client)
 666{
 667        struct adm9240_data *data = i2c_get_clientdata(client);
 668        u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
 669        u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
 670
 671        data->vrm = vid_which_vrm(); /* need this to report vid as mV */
 672
 673        dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
 674                        data->vrm % 10);
 675
 676        if (conf & 1) { /* measurement cycle running: report state */
 677
 678                dev_info(&client->dev, "status: config 0x%02x mode %u\n",
 679                                conf, mode);
 680
 681        } else { /* cold start: open limits before starting chip */
 682                int i;
 683
 684                for (i = 0; i < 6; i++) {
 685                        i2c_smbus_write_byte_data(client,
 686                                        ADM9240_REG_IN_MIN(i), 0);
 687                        i2c_smbus_write_byte_data(client,
 688                                        ADM9240_REG_IN_MAX(i), 255);
 689                }
 690                i2c_smbus_write_byte_data(client,
 691                                ADM9240_REG_FAN_MIN(0), 255);
 692                i2c_smbus_write_byte_data(client,
 693                                ADM9240_REG_FAN_MIN(1), 255);
 694                i2c_smbus_write_byte_data(client,
 695                                ADM9240_REG_TEMP_MAX(0), 127);
 696                i2c_smbus_write_byte_data(client,
 697                                ADM9240_REG_TEMP_MAX(1), 127);
 698
 699                /* start measurement cycle */
 700                i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
 701
 702                dev_info(&client->dev, "cold start: config was 0x%02x "
 703                                "mode %u\n", conf, mode);
 704        }
 705}
 706
 707static struct adm9240_data *adm9240_update_device(struct device *dev)
 708{
 709        struct i2c_client *client = to_i2c_client(dev);
 710        struct adm9240_data *data = i2c_get_clientdata(client);
 711        int i;
 712
 713        mutex_lock(&data->update_lock);
 714
 715        /* minimum measurement cycle: 1.75 seconds */
 716        if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
 717                        || !data->valid) {
 718
 719                for (i = 0; i < 6; i++) { /* read voltages */
 720                        data->in[i] = i2c_smbus_read_byte_data(client,
 721                                        ADM9240_REG_IN(i));
 722                }
 723                data->alarms = i2c_smbus_read_byte_data(client,
 724                                        ADM9240_REG_INT(0)) |
 725                                        i2c_smbus_read_byte_data(client,
 726                                        ADM9240_REG_INT(1)) << 8;
 727
 728                /*
 729                 * read temperature: assume temperature changes less than
 730                 * 0.5'C per two measurement cycles thus ignore possible
 731                 * but unlikely aliasing error on lsb reading. --Grant
 732                 */
 733                data->temp = ((i2c_smbus_read_byte_data(client,
 734                                        ADM9240_REG_TEMP) << 8) |
 735                                        i2c_smbus_read_byte_data(client,
 736                                        ADM9240_REG_TEMP_CONF)) / 128;
 737
 738                for (i = 0; i < 2; i++) { /* read fans */
 739                        data->fan[i] = i2c_smbus_read_byte_data(client,
 740                                        ADM9240_REG_FAN(i));
 741
 742                        /* adjust fan clock divider on overflow */
 743                        if (data->valid && data->fan[i] == 255 &&
 744                                        data->fan_div[i] < 3) {
 745
 746                                adm9240_write_fan_div(client, i,
 747                                                ++data->fan_div[i]);
 748
 749                                /* adjust fan_min if active, but not to 0 */
 750                                if (data->fan_min[i] < 255 &&
 751                                                data->fan_min[i] >= 2)
 752                                        data->fan_min[i] /= 2;
 753                        }
 754                }
 755                data->last_updated_measure = jiffies;
 756        }
 757
 758        /* minimum config reading cycle: 300 seconds */
 759        if (time_after(jiffies, data->last_updated_config + (HZ * 300))
 760                        || !data->valid) {
 761
 762                for (i = 0; i < 6; i++) {
 763                        data->in_min[i] = i2c_smbus_read_byte_data(client,
 764                                        ADM9240_REG_IN_MIN(i));
 765                        data->in_max[i] = i2c_smbus_read_byte_data(client,
 766                                        ADM9240_REG_IN_MAX(i));
 767                }
 768                for (i = 0; i < 2; i++) {
 769                        data->fan_min[i] = i2c_smbus_read_byte_data(client,
 770                                        ADM9240_REG_FAN_MIN(i));
 771                }
 772                data->temp_max[0] = i2c_smbus_read_byte_data(client,
 773                                ADM9240_REG_TEMP_MAX(0));
 774                data->temp_max[1] = i2c_smbus_read_byte_data(client,
 775                                ADM9240_REG_TEMP_MAX(1));
 776
 777                /* read fan divs and 5-bit VID */
 778                i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
 779                data->fan_div[0] = (i >> 4) & 3;
 780                data->fan_div[1] = (i >> 6) & 3;
 781                data->vid = i & 0x0f;
 782                data->vid |= (i2c_smbus_read_byte_data(client,
 783                                        ADM9240_REG_VID4) & 1) << 4;
 784                /* read analog out */
 785                data->aout = i2c_smbus_read_byte_data(client,
 786                                ADM9240_REG_ANALOG_OUT);
 787
 788                data->last_updated_config = jiffies;
 789                data->valid = 1;
 790        }
 791        mutex_unlock(&data->update_lock);
 792        return data;
 793}
 794
 795module_i2c_driver(adm9240_driver);
 796
 797MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
 798                "Grant Coady <gcoady.lk@gmail.com> and others");
 799MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
 800MODULE_LICENSE("GPL");
 801
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