linux/drivers/hwmon/smm665.c
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   1/*
   2 * Driver for SMM665 Power Controller / Monitor
   3 *
   4 * Copyright (C) 2010 Ericsson AB.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; version 2 of the License.
   9 *
  10 * This driver should also work for SMM465, SMM764, and SMM766, but is untested
  11 * for those chips. Only monitoring functionality is implemented.
  12 *
  13 * Datasheets:
  14 * http://www.summitmicro.com/prod_select/summary/SMM665/SMM665B_2089_20.pdf
  15 * http://www.summitmicro.com/prod_select/summary/SMM766B/SMM766B_2122.pdf
  16 */
  17
  18#include <linux/kernel.h>
  19#include <linux/module.h>
  20#include <linux/init.h>
  21#include <linux/err.h>
  22#include <linux/slab.h>
  23#include <linux/i2c.h>
  24#include <linux/hwmon.h>
  25#include <linux/hwmon-sysfs.h>
  26#include <linux/delay.h>
  27
  28/* Internal reference voltage (VREF, x 1000 */
  29#define SMM665_VREF_ADC_X1000   1250
  30
  31/* module parameters */
  32static int vref = SMM665_VREF_ADC_X1000;
  33module_param(vref, int, 0);
  34MODULE_PARM_DESC(vref, "Reference voltage in mV");
  35
  36enum chips { smm465, smm665, smm665c, smm764, smm766 };
  37
  38/*
  39 * ADC channel addresses
  40 */
  41#define SMM665_MISC16_ADC_DATA_A        0x00
  42#define SMM665_MISC16_ADC_DATA_B        0x01
  43#define SMM665_MISC16_ADC_DATA_C        0x02
  44#define SMM665_MISC16_ADC_DATA_D        0x03
  45#define SMM665_MISC16_ADC_DATA_E        0x04
  46#define SMM665_MISC16_ADC_DATA_F        0x05
  47#define SMM665_MISC16_ADC_DATA_VDD      0x06
  48#define SMM665_MISC16_ADC_DATA_12V      0x07
  49#define SMM665_MISC16_ADC_DATA_INT_TEMP 0x08
  50#define SMM665_MISC16_ADC_DATA_AIN1     0x09
  51#define SMM665_MISC16_ADC_DATA_AIN2     0x0a
  52
  53/*
  54 * Command registers
  55 */
  56#define SMM665_MISC8_CMD_STS            0x80
  57#define SMM665_MISC8_STATUS1            0x81
  58#define SMM665_MISC8_STATUSS2           0x82
  59#define SMM665_MISC8_IO_POLARITY        0x83
  60#define SMM665_MISC8_PUP_POLARITY       0x84
  61#define SMM665_MISC8_ADOC_STATUS1       0x85
  62#define SMM665_MISC8_ADOC_STATUS2       0x86
  63#define SMM665_MISC8_WRITE_PROT         0x87
  64#define SMM665_MISC8_STS_TRACK          0x88
  65
  66/*
  67 * Configuration registers and register groups
  68 */
  69#define SMM665_ADOC_ENABLE              0x0d
  70#define SMM665_LIMIT_BASE               0x80    /* First limit register */
  71
  72/*
  73 * Limit register bit masks
  74 */
  75#define SMM665_TRIGGER_RST              0x8000
  76#define SMM665_TRIGGER_HEALTHY          0x4000
  77#define SMM665_TRIGGER_POWEROFF         0x2000
  78#define SMM665_TRIGGER_SHUTDOWN         0x1000
  79#define SMM665_ADC_MASK                 0x03ff
  80
  81#define smm665_is_critical(lim) ((lim) & (SMM665_TRIGGER_RST \
  82                                        | SMM665_TRIGGER_POWEROFF \
  83                                        | SMM665_TRIGGER_SHUTDOWN))
  84/*
  85 * Fault register bit definitions
  86 * Values are merged from status registers 1/2,
  87 * with status register 1 providing the upper 8 bits.
  88 */
  89#define SMM665_FAULT_A          0x0001
  90#define SMM665_FAULT_B          0x0002
  91#define SMM665_FAULT_C          0x0004
  92#define SMM665_FAULT_D          0x0008
  93#define SMM665_FAULT_E          0x0010
  94#define SMM665_FAULT_F          0x0020
  95#define SMM665_FAULT_VDD        0x0040
  96#define SMM665_FAULT_12V        0x0080
  97#define SMM665_FAULT_TEMP       0x0100
  98#define SMM665_FAULT_AIN1       0x0200
  99#define SMM665_FAULT_AIN2       0x0400
 100
 101/*
 102 * I2C Register addresses
 103 *
 104 * The configuration register needs to be the configured base register.
 105 * The command/status register address is derived from it.
 106 */
 107#define SMM665_REGMASK          0x78
 108#define SMM665_CMDREG_BASE      0x48
 109#define SMM665_CONFREG_BASE     0x50
 110
 111/*
 112 *  Equations given by chip manufacturer to calculate voltage/temperature values
 113 *  vref = Reference voltage on VREF_ADC pin (module parameter)
 114 *  adc  = 10bit ADC value read back from registers
 115 */
 116
 117/* Voltage A-F and VDD */
 118#define SMM665_VMON_ADC_TO_VOLTS(adc)  ((adc) * vref / 256)
 119
 120/* Voltage 12VIN */
 121#define SMM665_12VIN_ADC_TO_VOLTS(adc) ((adc) * vref * 3 / 256)
 122
 123/* Voltage AIN1, AIN2 */
 124#define SMM665_AIN_ADC_TO_VOLTS(adc)   ((adc) * vref / 512)
 125
 126/* Temp Sensor */
 127#define SMM665_TEMP_ADC_TO_CELSIUS(adc) (((adc) <= 511) ?                  \
 128                                         ((int)(adc) * 1000 / 4) :         \
 129                                         (((int)(adc) - 0x400) * 1000 / 4))
 130
 131#define SMM665_NUM_ADC          11
 132
 133/*
 134 * Chip dependent ADC conversion time, in uS
 135 */
 136#define SMM665_ADC_WAIT_SMM665  70
 137#define SMM665_ADC_WAIT_SMM766  185
 138
 139struct smm665_data {
 140        enum chips type;
 141        int conversion_time;            /* ADC conversion time */
 142        struct device *hwmon_dev;
 143        struct mutex update_lock;
 144        bool valid;
 145        unsigned long last_updated;     /* in jiffies */
 146        u16 adc[SMM665_NUM_ADC];        /* adc values (raw) */
 147        u16 faults;                     /* fault status */
 148        /* The following values are in mV */
 149        int critical_min_limit[SMM665_NUM_ADC];
 150        int alarm_min_limit[SMM665_NUM_ADC];
 151        int critical_max_limit[SMM665_NUM_ADC];
 152        int alarm_max_limit[SMM665_NUM_ADC];
 153        struct i2c_client *cmdreg;
 154};
 155
 156/*
 157 * smm665_read16()
 158 *
 159 * Read 16 bit value from <reg>, <reg+1>. Upper 8 bits are in <reg>.
 160 */
 161static int smm665_read16(struct i2c_client *client, int reg)
 162{
 163        int rv, val;
 164
 165        rv = i2c_smbus_read_byte_data(client, reg);
 166        if (rv < 0)
 167                return rv;
 168        val = rv << 8;
 169        rv = i2c_smbus_read_byte_data(client, reg + 1);
 170        if (rv < 0)
 171                return rv;
 172        val |= rv;
 173        return val;
 174}
 175
 176/*
 177 * Read adc value.
 178 */
 179static int smm665_read_adc(struct smm665_data *data, int adc)
 180{
 181        struct i2c_client *client = data->cmdreg;
 182        int rv;
 183        int radc;
 184
 185        /*
 186         * Algorithm for reading ADC, per SMM665 datasheet
 187         *
 188         *  {[S][addr][W][Ack]} {[offset][Ack]} {[S][addr][R][Nack]}
 189         * [wait conversion time]
 190         *  {[S][addr][R][Ack]} {[datahi][Ack]} {[datalo][Ack][P]}
 191         *
 192         * To implement the first part of this exchange,
 193         * do a full read transaction and expect a failure/Nack.
 194         * This sets up the address pointer on the SMM665
 195         * and starts the ADC conversion.
 196         * Then do a two-byte read transaction.
 197         */
 198        rv = i2c_smbus_read_byte_data(client, adc << 3);
 199        if (rv != -ENXIO) {
 200                /*
 201                 * We expect ENXIO to reflect NACK
 202                 * (per Documentation/i2c/fault-codes).
 203                 * Everything else is an error.
 204                 */
 205                dev_dbg(&client->dev,
 206                        "Unexpected return code %d when setting ADC index", rv);
 207                return (rv < 0) ? rv : -EIO;
 208        }
 209
 210        udelay(data->conversion_time);
 211
 212        /*
 213         * Now read two bytes.
 214         *
 215         * Neither i2c_smbus_read_byte() nor
 216         * i2c_smbus_read_block_data() worked here,
 217         * so use i2c_smbus_read_word_swapped() instead.
 218         * We could also try to use i2c_master_recv(),
 219         * but that is not always supported.
 220         */
 221        rv = i2c_smbus_read_word_swapped(client, 0);
 222        if (rv < 0) {
 223                dev_dbg(&client->dev, "Failed to read ADC value: error %d", rv);
 224                return -1;
 225        }
 226        /*
 227         * Validate/verify readback adc channel (in bit 11..14).
 228         */
 229        radc = (rv >> 11) & 0x0f;
 230        if (radc != adc) {
 231                dev_dbg(&client->dev, "Unexpected RADC: Expected %d got %d",
 232                        adc, radc);
 233                return -EIO;
 234        }
 235
 236        return rv & SMM665_ADC_MASK;
 237}
 238
 239static struct smm665_data *smm665_update_device(struct device *dev)
 240{
 241        struct i2c_client *client = to_i2c_client(dev);
 242        struct smm665_data *data = i2c_get_clientdata(client);
 243        struct smm665_data *ret = data;
 244
 245        mutex_lock(&data->update_lock);
 246
 247        if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 248                int i, val;
 249
 250                /*
 251                 * read status registers
 252                 */
 253                val = smm665_read16(client, SMM665_MISC8_STATUS1);
 254                if (unlikely(val < 0)) {
 255                        ret = ERR_PTR(val);
 256                        goto abort;
 257                }
 258                data->faults = val;
 259
 260                /* Read adc registers */
 261                for (i = 0; i < SMM665_NUM_ADC; i++) {
 262                        val = smm665_read_adc(data, i);
 263                        if (unlikely(val < 0)) {
 264                                ret = ERR_PTR(val);
 265                                goto abort;
 266                        }
 267                        data->adc[i] = val;
 268                }
 269                data->last_updated = jiffies;
 270                data->valid = 1;
 271        }
 272abort:
 273        mutex_unlock(&data->update_lock);
 274        return ret;
 275}
 276
 277/* Return converted value from given adc */
 278static int smm665_convert(u16 adcval, int index)
 279{
 280        int val = 0;
 281
 282        switch (index) {
 283        case SMM665_MISC16_ADC_DATA_12V:
 284                val = SMM665_12VIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 285                break;
 286
 287        case SMM665_MISC16_ADC_DATA_VDD:
 288        case SMM665_MISC16_ADC_DATA_A:
 289        case SMM665_MISC16_ADC_DATA_B:
 290        case SMM665_MISC16_ADC_DATA_C:
 291        case SMM665_MISC16_ADC_DATA_D:
 292        case SMM665_MISC16_ADC_DATA_E:
 293        case SMM665_MISC16_ADC_DATA_F:
 294                val = SMM665_VMON_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 295                break;
 296
 297        case SMM665_MISC16_ADC_DATA_AIN1:
 298        case SMM665_MISC16_ADC_DATA_AIN2:
 299                val = SMM665_AIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 300                break;
 301
 302        case SMM665_MISC16_ADC_DATA_INT_TEMP:
 303                val = SMM665_TEMP_ADC_TO_CELSIUS(adcval & SMM665_ADC_MASK);
 304                break;
 305
 306        default:
 307                /* If we get here, the developer messed up */
 308                WARN_ON_ONCE(1);
 309                break;
 310        }
 311
 312        return val;
 313}
 314
 315static int smm665_get_min(struct device *dev, int index)
 316{
 317        struct i2c_client *client = to_i2c_client(dev);
 318        struct smm665_data *data = i2c_get_clientdata(client);
 319
 320        return data->alarm_min_limit[index];
 321}
 322
 323static int smm665_get_max(struct device *dev, int index)
 324{
 325        struct i2c_client *client = to_i2c_client(dev);
 326        struct smm665_data *data = i2c_get_clientdata(client);
 327
 328        return data->alarm_max_limit[index];
 329}
 330
 331static int smm665_get_lcrit(struct device *dev, int index)
 332{
 333        struct i2c_client *client = to_i2c_client(dev);
 334        struct smm665_data *data = i2c_get_clientdata(client);
 335
 336        return data->critical_min_limit[index];
 337}
 338
 339static int smm665_get_crit(struct device *dev, int index)
 340{
 341        struct i2c_client *client = to_i2c_client(dev);
 342        struct smm665_data *data = i2c_get_clientdata(client);
 343
 344        return data->critical_max_limit[index];
 345}
 346
 347static ssize_t smm665_show_crit_alarm(struct device *dev,
 348                                      struct device_attribute *da, char *buf)
 349{
 350        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 351        struct smm665_data *data = smm665_update_device(dev);
 352        int val = 0;
 353
 354        if (IS_ERR(data))
 355                return PTR_ERR(data);
 356
 357        if (data->faults & (1 << attr->index))
 358                val = 1;
 359
 360        return snprintf(buf, PAGE_SIZE, "%d\n", val);
 361}
 362
 363static ssize_t smm665_show_input(struct device *dev,
 364                                 struct device_attribute *da, char *buf)
 365{
 366        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 367        struct smm665_data *data = smm665_update_device(dev);
 368        int adc = attr->index;
 369        int val;
 370
 371        if (IS_ERR(data))
 372                return PTR_ERR(data);
 373
 374        val = smm665_convert(data->adc[adc], adc);
 375        return snprintf(buf, PAGE_SIZE, "%d\n", val);
 376}
 377
 378#define SMM665_SHOW(what) \
 379static ssize_t smm665_show_##what(struct device *dev, \
 380                                    struct device_attribute *da, char *buf) \
 381{ \
 382        struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
 383        const int val = smm665_get_##what(dev, attr->index); \
 384        return snprintf(buf, PAGE_SIZE, "%d\n", val); \
 385}
 386
 387SMM665_SHOW(min);
 388SMM665_SHOW(max);
 389SMM665_SHOW(lcrit);
 390SMM665_SHOW(crit);
 391
 392/*
 393 * These macros are used below in constructing device attribute objects
 394 * for use with sysfs_create_group() to make a sysfs device file
 395 * for each register.
 396 */
 397
 398#define SMM665_ATTR(name, type, cmd_idx) \
 399        static SENSOR_DEVICE_ATTR(name##_##type, S_IRUGO, \
 400                                  smm665_show_##type, NULL, cmd_idx)
 401
 402/* Construct a sensor_device_attribute structure for each register */
 403
 404/* Input voltages */
 405SMM665_ATTR(in1, input, SMM665_MISC16_ADC_DATA_12V);
 406SMM665_ATTR(in2, input, SMM665_MISC16_ADC_DATA_VDD);
 407SMM665_ATTR(in3, input, SMM665_MISC16_ADC_DATA_A);
 408SMM665_ATTR(in4, input, SMM665_MISC16_ADC_DATA_B);
 409SMM665_ATTR(in5, input, SMM665_MISC16_ADC_DATA_C);
 410SMM665_ATTR(in6, input, SMM665_MISC16_ADC_DATA_D);
 411SMM665_ATTR(in7, input, SMM665_MISC16_ADC_DATA_E);
 412SMM665_ATTR(in8, input, SMM665_MISC16_ADC_DATA_F);
 413SMM665_ATTR(in9, input, SMM665_MISC16_ADC_DATA_AIN1);
 414SMM665_ATTR(in10, input, SMM665_MISC16_ADC_DATA_AIN2);
 415
 416/* Input voltages min */
 417SMM665_ATTR(in1, min, SMM665_MISC16_ADC_DATA_12V);
 418SMM665_ATTR(in2, min, SMM665_MISC16_ADC_DATA_VDD);
 419SMM665_ATTR(in3, min, SMM665_MISC16_ADC_DATA_A);
 420SMM665_ATTR(in4, min, SMM665_MISC16_ADC_DATA_B);
 421SMM665_ATTR(in5, min, SMM665_MISC16_ADC_DATA_C);
 422SMM665_ATTR(in6, min, SMM665_MISC16_ADC_DATA_D);
 423SMM665_ATTR(in7, min, SMM665_MISC16_ADC_DATA_E);
 424SMM665_ATTR(in8, min, SMM665_MISC16_ADC_DATA_F);
 425SMM665_ATTR(in9, min, SMM665_MISC16_ADC_DATA_AIN1);
 426SMM665_ATTR(in10, min, SMM665_MISC16_ADC_DATA_AIN2);
 427
 428/* Input voltages max */
 429SMM665_ATTR(in1, max, SMM665_MISC16_ADC_DATA_12V);
 430SMM665_ATTR(in2, max, SMM665_MISC16_ADC_DATA_VDD);
 431SMM665_ATTR(in3, max, SMM665_MISC16_ADC_DATA_A);
 432SMM665_ATTR(in4, max, SMM665_MISC16_ADC_DATA_B);
 433SMM665_ATTR(in5, max, SMM665_MISC16_ADC_DATA_C);
 434SMM665_ATTR(in6, max, SMM665_MISC16_ADC_DATA_D);
 435SMM665_ATTR(in7, max, SMM665_MISC16_ADC_DATA_E);
 436SMM665_ATTR(in8, max, SMM665_MISC16_ADC_DATA_F);
 437SMM665_ATTR(in9, max, SMM665_MISC16_ADC_DATA_AIN1);
 438SMM665_ATTR(in10, max, SMM665_MISC16_ADC_DATA_AIN2);
 439
 440/* Input voltages lcrit */
 441SMM665_ATTR(in1, lcrit, SMM665_MISC16_ADC_DATA_12V);
 442SMM665_ATTR(in2, lcrit, SMM665_MISC16_ADC_DATA_VDD);
 443SMM665_ATTR(in3, lcrit, SMM665_MISC16_ADC_DATA_A);
 444SMM665_ATTR(in4, lcrit, SMM665_MISC16_ADC_DATA_B);
 445SMM665_ATTR(in5, lcrit, SMM665_MISC16_ADC_DATA_C);
 446SMM665_ATTR(in6, lcrit, SMM665_MISC16_ADC_DATA_D);
 447SMM665_ATTR(in7, lcrit, SMM665_MISC16_ADC_DATA_E);
 448SMM665_ATTR(in8, lcrit, SMM665_MISC16_ADC_DATA_F);
 449SMM665_ATTR(in9, lcrit, SMM665_MISC16_ADC_DATA_AIN1);
 450SMM665_ATTR(in10, lcrit, SMM665_MISC16_ADC_DATA_AIN2);
 451
 452/* Input voltages crit */
 453SMM665_ATTR(in1, crit, SMM665_MISC16_ADC_DATA_12V);
 454SMM665_ATTR(in2, crit, SMM665_MISC16_ADC_DATA_VDD);
 455SMM665_ATTR(in3, crit, SMM665_MISC16_ADC_DATA_A);
 456SMM665_ATTR(in4, crit, SMM665_MISC16_ADC_DATA_B);
 457SMM665_ATTR(in5, crit, SMM665_MISC16_ADC_DATA_C);
 458SMM665_ATTR(in6, crit, SMM665_MISC16_ADC_DATA_D);
 459SMM665_ATTR(in7, crit, SMM665_MISC16_ADC_DATA_E);
 460SMM665_ATTR(in8, crit, SMM665_MISC16_ADC_DATA_F);
 461SMM665_ATTR(in9, crit, SMM665_MISC16_ADC_DATA_AIN1);
 462SMM665_ATTR(in10, crit, SMM665_MISC16_ADC_DATA_AIN2);
 463
 464/* critical alarms */
 465SMM665_ATTR(in1, crit_alarm, SMM665_FAULT_12V);
 466SMM665_ATTR(in2, crit_alarm, SMM665_FAULT_VDD);
 467SMM665_ATTR(in3, crit_alarm, SMM665_FAULT_A);
 468SMM665_ATTR(in4, crit_alarm, SMM665_FAULT_B);
 469SMM665_ATTR(in5, crit_alarm, SMM665_FAULT_C);
 470SMM665_ATTR(in6, crit_alarm, SMM665_FAULT_D);
 471SMM665_ATTR(in7, crit_alarm, SMM665_FAULT_E);
 472SMM665_ATTR(in8, crit_alarm, SMM665_FAULT_F);
 473SMM665_ATTR(in9, crit_alarm, SMM665_FAULT_AIN1);
 474SMM665_ATTR(in10, crit_alarm, SMM665_FAULT_AIN2);
 475
 476/* Temperature */
 477SMM665_ATTR(temp1, input, SMM665_MISC16_ADC_DATA_INT_TEMP);
 478SMM665_ATTR(temp1, min, SMM665_MISC16_ADC_DATA_INT_TEMP);
 479SMM665_ATTR(temp1, max, SMM665_MISC16_ADC_DATA_INT_TEMP);
 480SMM665_ATTR(temp1, lcrit, SMM665_MISC16_ADC_DATA_INT_TEMP);
 481SMM665_ATTR(temp1, crit, SMM665_MISC16_ADC_DATA_INT_TEMP);
 482SMM665_ATTR(temp1, crit_alarm, SMM665_FAULT_TEMP);
 483
 484/*
 485 * Finally, construct an array of pointers to members of the above objects,
 486 * as required for sysfs_create_group()
 487 */
 488static struct attribute *smm665_attributes[] = {
 489        &sensor_dev_attr_in1_input.dev_attr.attr,
 490        &sensor_dev_attr_in1_min.dev_attr.attr,
 491        &sensor_dev_attr_in1_max.dev_attr.attr,
 492        &sensor_dev_attr_in1_lcrit.dev_attr.attr,
 493        &sensor_dev_attr_in1_crit.dev_attr.attr,
 494        &sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
 495
 496        &sensor_dev_attr_in2_input.dev_attr.attr,
 497        &sensor_dev_attr_in2_min.dev_attr.attr,
 498        &sensor_dev_attr_in2_max.dev_attr.attr,
 499        &sensor_dev_attr_in2_lcrit.dev_attr.attr,
 500        &sensor_dev_attr_in2_crit.dev_attr.attr,
 501        &sensor_dev_attr_in2_crit_alarm.dev_attr.attr,
 502
 503        &sensor_dev_attr_in3_input.dev_attr.attr,
 504        &sensor_dev_attr_in3_min.dev_attr.attr,
 505        &sensor_dev_attr_in3_max.dev_attr.attr,
 506        &sensor_dev_attr_in3_lcrit.dev_attr.attr,
 507        &sensor_dev_attr_in3_crit.dev_attr.attr,
 508        &sensor_dev_attr_in3_crit_alarm.dev_attr.attr,
 509
 510        &sensor_dev_attr_in4_input.dev_attr.attr,
 511        &sensor_dev_attr_in4_min.dev_attr.attr,
 512        &sensor_dev_attr_in4_max.dev_attr.attr,
 513        &sensor_dev_attr_in4_lcrit.dev_attr.attr,
 514        &sensor_dev_attr_in4_crit.dev_attr.attr,
 515        &sensor_dev_attr_in4_crit_alarm.dev_attr.attr,
 516
 517        &sensor_dev_attr_in5_input.dev_attr.attr,
 518        &sensor_dev_attr_in5_min.dev_attr.attr,
 519        &sensor_dev_attr_in5_max.dev_attr.attr,
 520        &sensor_dev_attr_in5_lcrit.dev_attr.attr,
 521        &sensor_dev_attr_in5_crit.dev_attr.attr,
 522        &sensor_dev_attr_in5_crit_alarm.dev_attr.attr,
 523
 524        &sensor_dev_attr_in6_input.dev_attr.attr,
 525        &sensor_dev_attr_in6_min.dev_attr.attr,
 526        &sensor_dev_attr_in6_max.dev_attr.attr,
 527        &sensor_dev_attr_in6_lcrit.dev_attr.attr,
 528        &sensor_dev_attr_in6_crit.dev_attr.attr,
 529        &sensor_dev_attr_in6_crit_alarm.dev_attr.attr,
 530
 531        &sensor_dev_attr_in7_input.dev_attr.attr,
 532        &sensor_dev_attr_in7_min.dev_attr.attr,
 533        &sensor_dev_attr_in7_max.dev_attr.attr,
 534        &sensor_dev_attr_in7_lcrit.dev_attr.attr,
 535        &sensor_dev_attr_in7_crit.dev_attr.attr,
 536        &sensor_dev_attr_in7_crit_alarm.dev_attr.attr,
 537
 538        &sensor_dev_attr_in8_input.dev_attr.attr,
 539        &sensor_dev_attr_in8_min.dev_attr.attr,
 540        &sensor_dev_attr_in8_max.dev_attr.attr,
 541        &sensor_dev_attr_in8_lcrit.dev_attr.attr,
 542        &sensor_dev_attr_in8_crit.dev_attr.attr,
 543        &sensor_dev_attr_in8_crit_alarm.dev_attr.attr,
 544
 545        &sensor_dev_attr_in9_input.dev_attr.attr,
 546        &sensor_dev_attr_in9_min.dev_attr.attr,
 547        &sensor_dev_attr_in9_max.dev_attr.attr,
 548        &sensor_dev_attr_in9_lcrit.dev_attr.attr,
 549        &sensor_dev_attr_in9_crit.dev_attr.attr,
 550        &sensor_dev_attr_in9_crit_alarm.dev_attr.attr,
 551
 552        &sensor_dev_attr_in10_input.dev_attr.attr,
 553        &sensor_dev_attr_in10_min.dev_attr.attr,
 554        &sensor_dev_attr_in10_max.dev_attr.attr,
 555        &sensor_dev_attr_in10_lcrit.dev_attr.attr,
 556        &sensor_dev_attr_in10_crit.dev_attr.attr,
 557        &sensor_dev_attr_in10_crit_alarm.dev_attr.attr,
 558
 559        &sensor_dev_attr_temp1_input.dev_attr.attr,
 560        &sensor_dev_attr_temp1_min.dev_attr.attr,
 561        &sensor_dev_attr_temp1_max.dev_attr.attr,
 562        &sensor_dev_attr_temp1_lcrit.dev_attr.attr,
 563        &sensor_dev_attr_temp1_crit.dev_attr.attr,
 564        &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 565
 566        NULL,
 567};
 568
 569static const struct attribute_group smm665_group = {
 570        .attrs = smm665_attributes,
 571};
 572
 573static int smm665_probe(struct i2c_client *client,
 574                        const struct i2c_device_id *id)
 575{
 576        struct i2c_adapter *adapter = client->adapter;
 577        struct smm665_data *data;
 578        int i, ret;
 579
 580        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
 581                                     | I2C_FUNC_SMBUS_WORD_DATA))
 582                return -ENODEV;
 583
 584        if (i2c_smbus_read_byte_data(client, SMM665_ADOC_ENABLE) < 0)
 585                return -ENODEV;
 586
 587        data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 588        if (!data)
 589                return -ENOMEM;
 590
 591        i2c_set_clientdata(client, data);
 592        mutex_init(&data->update_lock);
 593
 594        data->type = id->driver_data;
 595        data->cmdreg = i2c_new_dummy(adapter, (client->addr & ~SMM665_REGMASK)
 596                                     | SMM665_CMDREG_BASE);
 597        if (!data->cmdreg)
 598                return -ENOMEM;
 599
 600        switch (data->type) {
 601        case smm465:
 602        case smm665:
 603                data->conversion_time = SMM665_ADC_WAIT_SMM665;
 604                break;
 605        case smm665c:
 606        case smm764:
 607        case smm766:
 608                data->conversion_time = SMM665_ADC_WAIT_SMM766;
 609                break;
 610        }
 611
 612        ret = -ENODEV;
 613        if (i2c_smbus_read_byte_data(data->cmdreg, SMM665_MISC8_CMD_STS) < 0)
 614                goto out_unregister;
 615
 616        /*
 617         * Read limits.
 618         *
 619         * Limit registers start with register SMM665_LIMIT_BASE.
 620         * Each channel uses 8 registers, providing four limit values
 621         * per channel. Each limit value requires two registers, with the
 622         * high byte in the first register and the low byte in the second
 623         * register. The first two limits are under limit values, followed
 624         * by two over limit values.
 625         *
 626         * Limit register order matches the ADC register order, so we use
 627         * ADC register defines throughout the code to index limit registers.
 628         *
 629         * We save the first retrieved value both as "critical" and "alarm"
 630         * value. The second value overwrites either the critical or the
 631         * alarm value, depending on its configuration. This ensures that both
 632         * critical and alarm values are initialized, even if both registers are
 633         * configured as critical or non-critical.
 634         */
 635        for (i = 0; i < SMM665_NUM_ADC; i++) {
 636                int val;
 637
 638                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8);
 639                if (unlikely(val < 0))
 640                        goto out_unregister;
 641                data->critical_min_limit[i] = data->alarm_min_limit[i]
 642                  = smm665_convert(val, i);
 643                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 2);
 644                if (unlikely(val < 0))
 645                        goto out_unregister;
 646                if (smm665_is_critical(val))
 647                        data->critical_min_limit[i] = smm665_convert(val, i);
 648                else
 649                        data->alarm_min_limit[i] = smm665_convert(val, i);
 650                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 4);
 651                if (unlikely(val < 0))
 652                        goto out_unregister;
 653                data->critical_max_limit[i] = data->alarm_max_limit[i]
 654                  = smm665_convert(val, i);
 655                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 6);
 656                if (unlikely(val < 0))
 657                        goto out_unregister;
 658                if (smm665_is_critical(val))
 659                        data->critical_max_limit[i] = smm665_convert(val, i);
 660                else
 661                        data->alarm_max_limit[i] = smm665_convert(val, i);
 662        }
 663
 664        /* Register sysfs hooks */
 665        ret = sysfs_create_group(&client->dev.kobj, &smm665_group);
 666        if (ret)
 667                goto out_unregister;
 668
 669        data->hwmon_dev = hwmon_device_register(&client->dev);
 670        if (IS_ERR(data->hwmon_dev)) {
 671                ret = PTR_ERR(data->hwmon_dev);
 672                goto out_remove_group;
 673        }
 674
 675        return 0;
 676
 677out_remove_group:
 678        sysfs_remove_group(&client->dev.kobj, &smm665_group);
 679out_unregister:
 680        i2c_unregister_device(data->cmdreg);
 681        return ret;
 682}
 683
 684static int smm665_remove(struct i2c_client *client)
 685{
 686        struct smm665_data *data = i2c_get_clientdata(client);
 687
 688        i2c_unregister_device(data->cmdreg);
 689        hwmon_device_unregister(data->hwmon_dev);
 690        sysfs_remove_group(&client->dev.kobj, &smm665_group);
 691
 692        return 0;
 693}
 694
 695static const struct i2c_device_id smm665_id[] = {
 696        {"smm465", smm465},
 697        {"smm665", smm665},
 698        {"smm665c", smm665c},
 699        {"smm764", smm764},
 700        {"smm766", smm766},
 701        {}
 702};
 703
 704MODULE_DEVICE_TABLE(i2c, smm665_id);
 705
 706/* This is the driver that will be inserted */
 707static struct i2c_driver smm665_driver = {
 708        .driver = {
 709                   .name = "smm665",
 710                   },
 711        .probe = smm665_probe,
 712        .remove = smm665_remove,
 713        .id_table = smm665_id,
 714};
 715
 716module_i2c_driver(smm665_driver);
 717
 718MODULE_AUTHOR("Guenter Roeck");
 719MODULE_DESCRIPTION("SMM665 driver");
 720MODULE_LICENSE("GPL");
 721
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