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#include <linux/jiffies.h>
  28
  29/* Internal reference voltage (VREF, x 1000 */
  30#define SMM665_VREF_ADC_X1000   1250
  31
  32/* module parameters */
  33static int vref = SMM665_VREF_ADC_X1000;
  34module_param(vref, int, 0);
  35MODULE_PARM_DESC(vref, "Reference voltage in mV");
  36
  37enum chips { smm465, smm665, smm665c, smm764, smm766 };
  38
  39/*
  40 * ADC channel addresses
  41 */
  42#define SMM665_MISC16_ADC_DATA_A        0x00
  43#define SMM665_MISC16_ADC_DATA_B        0x01
  44#define SMM665_MISC16_ADC_DATA_C        0x02
  45#define SMM665_MISC16_ADC_DATA_D        0x03
  46#define SMM665_MISC16_ADC_DATA_E        0x04
  47#define SMM665_MISC16_ADC_DATA_F        0x05
  48#define SMM665_MISC16_ADC_DATA_VDD      0x06
  49#define SMM665_MISC16_ADC_DATA_12V      0x07
  50#define SMM665_MISC16_ADC_DATA_INT_TEMP 0x08
  51#define SMM665_MISC16_ADC_DATA_AIN1     0x09
  52#define SMM665_MISC16_ADC_DATA_AIN2     0x0a
  53
  54/*
  55 * Command registers
  56 */
  57#define SMM665_MISC8_CMD_STS            0x80
  58#define SMM665_MISC8_STATUS1            0x81
  59#define SMM665_MISC8_STATUSS2           0x82
  60#define SMM665_MISC8_IO_POLARITY        0x83
  61#define SMM665_MISC8_PUP_POLARITY       0x84
  62#define SMM665_MISC8_ADOC_STATUS1       0x85
  63#define SMM665_MISC8_ADOC_STATUS2       0x86
  64#define SMM665_MISC8_WRITE_PROT         0x87
  65#define SMM665_MISC8_STS_TRACK          0x88
  66
  67/*
  68 * Configuration registers and register groups
  69 */
  70#define SMM665_ADOC_ENABLE              0x0d
  71#define SMM665_LIMIT_BASE               0x80    /* First limit register */
  72
  73/*
  74 * Limit register bit masks
  75 */
  76#define SMM665_TRIGGER_RST              0x8000
  77#define SMM665_TRIGGER_HEALTHY          0x4000
  78#define SMM665_TRIGGER_POWEROFF         0x2000
  79#define SMM665_TRIGGER_SHUTDOWN         0x1000
  80#define SMM665_ADC_MASK                 0x03ff
  81
  82#define smm665_is_critical(lim) ((lim) & (SMM665_TRIGGER_RST \
  83                                        | SMM665_TRIGGER_POWEROFF \
  84                                        | SMM665_TRIGGER_SHUTDOWN))
  85/*
  86 * Fault register bit definitions
  87 * Values are merged from status registers 1/2,
  88 * with status register 1 providing the upper 8 bits.
  89 */
  90#define SMM665_FAULT_A          0x0001
  91#define SMM665_FAULT_B          0x0002
  92#define SMM665_FAULT_C          0x0004
  93#define SMM665_FAULT_D          0x0008
  94#define SMM665_FAULT_E          0x0010
  95#define SMM665_FAULT_F          0x0020
  96#define SMM665_FAULT_VDD        0x0040
  97#define SMM665_FAULT_12V        0x0080
  98#define SMM665_FAULT_TEMP       0x0100
  99#define SMM665_FAULT_AIN1       0x0200
 100#define SMM665_FAULT_AIN2       0x0400
 101
 102/*
 103 * I2C Register addresses
 104 *
 105 * The configuration register needs to be the configured base register.
 106 * The command/status register address is derived from it.
 107 */
 108#define SMM665_REGMASK          0x78
 109#define SMM665_CMDREG_BASE      0x48
 110#define SMM665_CONFREG_BASE     0x50
 111
 112/*
 113 *  Equations given by chip manufacturer to calculate voltage/temperature values
 114 *  vref = Reference voltage on VREF_ADC pin (module parameter)
 115 *  adc  = 10bit ADC value read back from registers
 116 */
 117
 118/* Voltage A-F and VDD */
 119#define SMM665_VMON_ADC_TO_VOLTS(adc)  ((adc) * vref / 256)
 120
 121/* Voltage 12VIN */
 122#define SMM665_12VIN_ADC_TO_VOLTS(adc) ((adc) * vref * 3 / 256)
 123
 124/* Voltage AIN1, AIN2 */
 125#define SMM665_AIN_ADC_TO_VOLTS(adc)   ((adc) * vref / 512)
 126
 127/* Temp Sensor */
 128#define SMM665_TEMP_ADC_TO_CELSIUS(adc) (((adc) <= 511) ?                  \
 129                                         ((int)(adc) * 1000 / 4) :         \
 130                                         (((int)(adc) - 0x400) * 1000 / 4))
 131
 132#define SMM665_NUM_ADC          11
 133
 134/*
 135 * Chip dependent ADC conversion time, in uS
 136 */
 137#define SMM665_ADC_WAIT_SMM665  70
 138#define SMM665_ADC_WAIT_SMM766  185
 139
 140struct smm665_data {
 141        enum chips type;
 142        int conversion_time;            /* ADC conversion time */
 143        struct device *hwmon_dev;
 144        struct mutex update_lock;
 145        bool valid;
 146        unsigned long last_updated;     /* in jiffies */
 147        u16 adc[SMM665_NUM_ADC];        /* adc values (raw) */
 148        u16 faults;                     /* fault status */
 149        /* The following values are in mV */
 150        int critical_min_limit[SMM665_NUM_ADC];
 151        int alarm_min_limit[SMM665_NUM_ADC];
 152        int critical_max_limit[SMM665_NUM_ADC];
 153        int alarm_max_limit[SMM665_NUM_ADC];
 154        struct i2c_client *cmdreg;
 155};
 156
 157/*
 158 * smm665_read16()
 159 *
 160 * Read 16 bit value from <reg>, <reg+1>. Upper 8 bits are in <reg>.
 161 */
 162static int smm665_read16(struct i2c_client *client, int reg)
 163{
 164        int rv, val;
 165
 166        rv = i2c_smbus_read_byte_data(client, reg);
 167        if (rv < 0)
 168                return rv;
 169        val = rv << 8;
 170        rv = i2c_smbus_read_byte_data(client, reg + 1);
 171        if (rv < 0)
 172                return rv;
 173        val |= rv;
 174        return val;
 175}
 176
 177/*
 178 * Read adc value.
 179 */
 180static int smm665_read_adc(struct smm665_data *data, int adc)
 181{
 182        struct i2c_client *client = data->cmdreg;
 183        int rv;
 184        int radc;
 185
 186        /*
 187         * Algorithm for reading ADC, per SMM665 datasheet
 188         *
 189         *  {[S][addr][W][Ack]} {[offset][Ack]} {[S][addr][R][Nack]}
 190         * [wait conversion time]
 191         *  {[S][addr][R][Ack]} {[datahi][Ack]} {[datalo][Ack][P]}
 192         *
 193         * To implement the first part of this exchange,
 194         * do a full read transaction and expect a failure/Nack.
 195         * This sets up the address pointer on the SMM665
 196         * and starts the ADC conversion.
 197         * Then do a two-byte read transaction.
 198         */
 199        rv = i2c_smbus_read_byte_data(client, adc << 3);
 200        if (rv != -ENXIO) {
 201                /*
 202                 * We expect ENXIO to reflect NACK
 203                 * (per Documentation/i2c/fault-codes).
 204                 * Everything else is an error.
 205                 */
 206                dev_dbg(&client->dev,
 207                        "Unexpected return code %d when setting ADC index", rv);
 208                return (rv < 0) ? rv : -EIO;
 209        }
 210
 211        udelay(data->conversion_time);
 212
 213        /*
 214         * Now read two bytes.
 215         *
 216         * Neither i2c_smbus_read_byte() nor
 217         * i2c_smbus_read_block_data() worked here,
 218         * so use i2c_smbus_read_word_swapped() instead.
 219         * We could also try to use i2c_master_recv(),
 220         * but that is not always supported.
 221         */
 222        rv = i2c_smbus_read_word_swapped(client, 0);
 223        if (rv < 0) {
 224                dev_dbg(&client->dev, "Failed to read ADC value: error %d", rv);
 225                return -1;
 226        }
 227        /*
 228         * Validate/verify readback adc channel (in bit 11..14).
 229         */
 230        radc = (rv >> 11) & 0x0f;
 231        if (radc != adc) {
 232                dev_dbg(&client->dev, "Unexpected RADC: Expected %d got %d",
 233                        adc, radc);
 234                return -EIO;
 235        }
 236
 237        return rv & SMM665_ADC_MASK;
 238}
 239
 240static struct smm665_data *smm665_update_device(struct device *dev)
 241{
 242        struct i2c_client *client = to_i2c_client(dev);
 243        struct smm665_data *data = i2c_get_clientdata(client);
 244        struct smm665_data *ret = data;
 245
 246        mutex_lock(&data->update_lock);
 247
 248        if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 249                int i, val;
 250
 251                /*
 252                 * read status registers
 253                 */
 254                val = smm665_read16(client, SMM665_MISC8_STATUS1);
 255                if (unlikely(val < 0)) {
 256                        ret = ERR_PTR(val);
 257                        goto abort;
 258                }
 259                data->faults = val;
 260
 261                /* Read adc registers */
 262                for (i = 0; i < SMM665_NUM_ADC; i++) {
 263                        val = smm665_read_adc(data, i);
 264                        if (unlikely(val < 0)) {
 265                                ret = ERR_PTR(val);
 266                                goto abort;
 267                        }
 268                        data->adc[i] = val;
 269                }
 270                data->last_updated = jiffies;
 271                data->valid = 1;
 272        }
 273abort:
 274        mutex_unlock(&data->update_lock);
 275        return ret;
 276}
 277
 278/* Return converted value from given adc */
 279static int smm665_convert(u16 adcval, int index)
 280{
 281        int val = 0;
 282
 283        switch (index) {
 284        case SMM665_MISC16_ADC_DATA_12V:
 285                val = SMM665_12VIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 286                break;
 287
 288        case SMM665_MISC16_ADC_DATA_VDD:
 289        case SMM665_MISC16_ADC_DATA_A:
 290        case SMM665_MISC16_ADC_DATA_B:
 291        case SMM665_MISC16_ADC_DATA_C:
 292        case SMM665_MISC16_ADC_DATA_D:
 293        case SMM665_MISC16_ADC_DATA_E:
 294        case SMM665_MISC16_ADC_DATA_F:
 295                val = SMM665_VMON_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 296                break;
 297
 298        case SMM665_MISC16_ADC_DATA_AIN1:
 299        case SMM665_MISC16_ADC_DATA_AIN2:
 300                val = SMM665_AIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 301                break;
 302
 303        case SMM665_MISC16_ADC_DATA_INT_TEMP:
 304                val = SMM665_TEMP_ADC_TO_CELSIUS(adcval & SMM665_ADC_MASK);
 305                break;
 306
 307        default:
 308                /* If we get here, the developer messed up */
 309                WARN_ON_ONCE(1);
 310                break;
 311        }
 312
 313        return val;
 314}
 315
 316static int smm665_get_min(struct device *dev, int index)
 317{
 318        struct i2c_client *client = to_i2c_client(dev);
 319        struct smm665_data *data = i2c_get_clientdata(client);
 320
 321        return data->alarm_min_limit[index];
 322}
 323
 324static int smm665_get_max(struct device *dev, int index)
 325{
 326        struct i2c_client *client = to_i2c_client(dev);
 327        struct smm665_data *data = i2c_get_clientdata(client);
 328
 329        return data->alarm_max_limit[index];
 330}
 331
 332static int smm665_get_lcrit(struct device *dev, int index)
 333{
 334        struct i2c_client *client = to_i2c_client(dev);
 335        struct smm665_data *data = i2c_get_clientdata(client);
 336
 337        return data->critical_min_limit[index];
 338}
 339
 340static int smm665_get_crit(struct device *dev, int index)
 341{
 342        struct i2c_client *client = to_i2c_client(dev);
 343        struct smm665_data *data = i2c_get_clientdata(client);
 344
 345        return data->critical_max_limit[index];
 346}
 347
 348static ssize_t smm665_show_crit_alarm(struct device *dev,
 349                                      struct device_attribute *da, char *buf)
 350{
 351        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 352        struct smm665_data *data = smm665_update_device(dev);
 353        int val = 0;
 354
 355        if (IS_ERR(data))
 356                return PTR_ERR(data);
 357
 358        if (data->faults & (1 << attr->index))
 359                val = 1;
 360
 361        return snprintf(buf, PAGE_SIZE, "%d\n", val);
 362}
 363
 364static ssize_t smm665_show_input(struct device *dev,
 365                                 struct device_attribute *da, char *buf)
 366{
 367        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 368        struct smm665_data *data = smm665_update_device(dev);
 369        int adc = attr->index;
 370        int val;
 371
 372        if (IS_ERR(data))
 373                return PTR_ERR(data);
 374
 375        val = smm665_convert(data->adc[adc], adc);
 376        return snprintf(buf, PAGE_SIZE, "%d\n", val);
 377}
 378
 379#define SMM665_SHOW(what) \
 380static ssize_t smm665_show_##what(struct device *dev, \
 381                                    struct device_attribute *da, char *buf) \
 382{ \
 383        struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
 384        const int val = smm665_get_##what(dev, attr->index); \
 385        return snprintf(buf, PAGE_SIZE, "%d\n", val); \
 386}
 387
 388SMM665_SHOW(min);
 389SMM665_SHOW(max);
 390SMM665_SHOW(lcrit);
 391SMM665_SHOW(crit);
 392
 393/*
 394 * These macros are used below in constructing device attribute objects
 395 * for use with sysfs_create_group() to make a sysfs device file
 396 * for each register.
 397 */
 398
 399#define SMM665_ATTR(name, type, cmd_idx) \
 400        static SENSOR_DEVICE_ATTR(name##_##type, S_IRUGO, \
 401                                  smm665_show_##type, NULL, cmd_idx)
 402
 403/* Construct a sensor_device_attribute structure for each register */
 404
 405/* Input voltages */
 406SMM665_ATTR(in1, input, SMM665_MISC16_ADC_DATA_12V);
 407SMM665_ATTR(in2, input, SMM665_MISC16_ADC_DATA_VDD);
 408SMM665_ATTR(in3, input, SMM665_MISC16_ADC_DATA_A);
 409SMM665_ATTR(in4, input, SMM665_MISC16_ADC_DATA_B);
 410SMM665_ATTR(in5, input, SMM665_MISC16_ADC_DATA_C);
 411SMM665_ATTR(in6, input, SMM665_MISC16_ADC_DATA_D);
 412SMM665_ATTR(in7, input, SMM665_MISC16_ADC_DATA_E);
 413SMM665_ATTR(in8, input, SMM665_MISC16_ADC_DATA_F);
 414SMM665_ATTR(in9, input, SMM665_MISC16_ADC_DATA_AIN1);
 415SMM665_ATTR(in10, input, SMM665_MISC16_ADC_DATA_AIN2);
 416
 417/* Input voltages min */
 418SMM665_ATTR(in1, min, SMM665_MISC16_ADC_DATA_12V);
 419SMM665_ATTR(in2, min, SMM665_MISC16_ADC_DATA_VDD);
 420SMM665_ATTR(in3, min, SMM665_MISC16_ADC_DATA_A);
 421SMM665_ATTR(in4, min, SMM665_MISC16_ADC_DATA_B);
 422SMM665_ATTR(in5, min, SMM665_MISC16_ADC_DATA_C);
 423SMM665_ATTR(in6, min, SMM665_MISC16_ADC_DATA_D);
 424SMM665_ATTR(in7, min, SMM665_MISC16_ADC_DATA_E);
 425SMM665_ATTR(in8, min, SMM665_MISC16_ADC_DATA_F);
 426SMM665_ATTR(in9, min, SMM665_MISC16_ADC_DATA_AIN1);
 427SMM665_ATTR(in10, min, SMM665_MISC16_ADC_DATA_AIN2);
 428
 429/* Input voltages max */
 430SMM665_ATTR(in1, max, SMM665_MISC16_ADC_DATA_12V);
 431SMM665_ATTR(in2, max, SMM665_MISC16_ADC_DATA_VDD);
 432SMM665_ATTR(in3, max, SMM665_MISC16_ADC_DATA_A);
 433SMM665_ATTR(in4, max, SMM665_MISC16_ADC_DATA_B);
 434SMM665_ATTR(in5, max, SMM665_MISC16_ADC_DATA_C);
 435SMM665_ATTR(in6, max, SMM665_MISC16_ADC_DATA_D);
 436SMM665_ATTR(in7, max, SMM665_MISC16_ADC_DATA_E);
 437SMM665_ATTR(in8, max, SMM665_MISC16_ADC_DATA_F);
 438SMM665_ATTR(in9, max, SMM665_MISC16_ADC_DATA_AIN1);
 439SMM665_ATTR(in10, max, SMM665_MISC16_ADC_DATA_AIN2);
 440
 441/* Input voltages lcrit */
 442SMM665_ATTR(in1, lcrit, SMM665_MISC16_ADC_DATA_12V);
 443SMM665_ATTR(in2, lcrit, SMM665_MISC16_ADC_DATA_VDD);
 444SMM665_ATTR(in3, lcrit, SMM665_MISC16_ADC_DATA_A);
 445SMM665_ATTR(in4, lcrit, SMM665_MISC16_ADC_DATA_B);
 446SMM665_ATTR(in5, lcrit, SMM665_MISC16_ADC_DATA_C);
 447SMM665_ATTR(in6, lcrit, SMM665_MISC16_ADC_DATA_D);
 448SMM665_ATTR(in7, lcrit, SMM665_MISC16_ADC_DATA_E);
 449SMM665_ATTR(in8, lcrit, SMM665_MISC16_ADC_DATA_F);
 450SMM665_ATTR(in9, lcrit, SMM665_MISC16_ADC_DATA_AIN1);
 451SMM665_ATTR(in10, lcrit, SMM665_MISC16_ADC_DATA_AIN2);
 452
 453/* Input voltages crit */
 454SMM665_ATTR(in1, crit, SMM665_MISC16_ADC_DATA_12V);
 455SMM665_ATTR(in2, crit, SMM665_MISC16_ADC_DATA_VDD);
 456SMM665_ATTR(in3, crit, SMM665_MISC16_ADC_DATA_A);
 457SMM665_ATTR(in4, crit, SMM665_MISC16_ADC_DATA_B);
 458SMM665_ATTR(in5, crit, SMM665_MISC16_ADC_DATA_C);
 459SMM665_ATTR(in6, crit, SMM665_MISC16_ADC_DATA_D);
 460SMM665_ATTR(in7, crit, SMM665_MISC16_ADC_DATA_E);
 461SMM665_ATTR(in8, crit, SMM665_MISC16_ADC_DATA_F);
 462SMM665_ATTR(in9, crit, SMM665_MISC16_ADC_DATA_AIN1);
 463SMM665_ATTR(in10, crit, SMM665_MISC16_ADC_DATA_AIN2);
 464
 465/* critical alarms */
 466SMM665_ATTR(in1, crit_alarm, SMM665_FAULT_12V);
 467SMM665_ATTR(in2, crit_alarm, SMM665_FAULT_VDD);
 468SMM665_ATTR(in3, crit_alarm, SMM665_FAULT_A);
 469SMM665_ATTR(in4, crit_alarm, SMM665_FAULT_B);
 470SMM665_ATTR(in5, crit_alarm, SMM665_FAULT_C);
 471SMM665_ATTR(in6, crit_alarm, SMM665_FAULT_D);
 472SMM665_ATTR(in7, crit_alarm, SMM665_FAULT_E);
 473SMM665_ATTR(in8, crit_alarm, SMM665_FAULT_F);
 474SMM665_ATTR(in9, crit_alarm, SMM665_FAULT_AIN1);
 475SMM665_ATTR(in10, crit_alarm, SMM665_FAULT_AIN2);
 476
 477/* Temperature */
 478SMM665_ATTR(temp1, input, SMM665_MISC16_ADC_DATA_INT_TEMP);
 479SMM665_ATTR(temp1, min, SMM665_MISC16_ADC_DATA_INT_TEMP);
 480SMM665_ATTR(temp1, max, SMM665_MISC16_ADC_DATA_INT_TEMP);
 481SMM665_ATTR(temp1, lcrit, SMM665_MISC16_ADC_DATA_INT_TEMP);
 482SMM665_ATTR(temp1, crit, SMM665_MISC16_ADC_DATA_INT_TEMP);
 483SMM665_ATTR(temp1, crit_alarm, SMM665_FAULT_TEMP);
 484
 485/*
 486 * Finally, construct an array of pointers to members of the above objects,
 487 * as required for sysfs_create_group()
 488 */
 489static struct attribute *smm665_attributes[] = {
 490        &sensor_dev_attr_in1_input.dev_attr.attr,
 491        &sensor_dev_attr_in1_min.dev_attr.attr,
 492        &sensor_dev_attr_in1_max.dev_attr.attr,
 493        &sensor_dev_attr_in1_lcrit.dev_attr.attr,
 494        &sensor_dev_attr_in1_crit.dev_attr.attr,
 495        &sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
 496
 497        &sensor_dev_attr_in2_input.dev_attr.attr,
 498        &sensor_dev_attr_in2_min.dev_attr.attr,
 499        &sensor_dev_attr_in2_max.dev_attr.attr,
 500        &sensor_dev_attr_in2_lcrit.dev_attr.attr,
 501        &sensor_dev_attr_in2_crit.dev_attr.attr,
 502        &sensor_dev_attr_in2_crit_alarm.dev_attr.attr,
 503
 504        &sensor_dev_attr_in3_input.dev_attr.attr,
 505        &sensor_dev_attr_in3_min.dev_attr.attr,
 506        &sensor_dev_attr_in3_max.dev_attr.attr,
 507        &sensor_dev_attr_in3_lcrit.dev_attr.attr,
 508        &sensor_dev_attr_in3_crit.dev_attr.attr,
 509        &sensor_dev_attr_in3_crit_alarm.dev_attr.attr,
 510
 511        &sensor_dev_attr_in4_input.dev_attr.attr,
 512        &sensor_dev_attr_in4_min.dev_attr.attr,
 513        &sensor_dev_attr_in4_max.dev_attr.attr,
 514        &sensor_dev_attr_in4_lcrit.dev_attr.attr,
 515        &sensor_dev_attr_in4_crit.dev_attr.attr,
 516        &sensor_dev_attr_in4_crit_alarm.dev_attr.attr,
 517
 518        &sensor_dev_attr_in5_input.dev_attr.attr,
 519        &sensor_dev_attr_in5_min.dev_attr.attr,
 520        &sensor_dev_attr_in5_max.dev_attr.attr,
 521        &sensor_dev_attr_in5_lcrit.dev_attr.attr,
 522        &sensor_dev_attr_in5_crit.dev_attr.attr,
 523        &sensor_dev_attr_in5_crit_alarm.dev_attr.attr,
 524
 525        &sensor_dev_attr_in6_input.dev_attr.attr,
 526        &sensor_dev_attr_in6_min.dev_attr.attr,
 527        &sensor_dev_attr_in6_max.dev_attr.attr,
 528        &sensor_dev_attr_in6_lcrit.dev_attr.attr,
 529        &sensor_dev_attr_in6_crit.dev_attr.attr,
 530        &sensor_dev_attr_in6_crit_alarm.dev_attr.attr,
 531
 532        &sensor_dev_attr_in7_input.dev_attr.attr,
 533        &sensor_dev_attr_in7_min.dev_attr.attr,
 534        &sensor_dev_attr_in7_max.dev_attr.attr,
 535        &sensor_dev_attr_in7_lcrit.dev_attr.attr,
 536        &sensor_dev_attr_in7_crit.dev_attr.attr,
 537        &sensor_dev_attr_in7_crit_alarm.dev_attr.attr,
 538
 539        &sensor_dev_attr_in8_input.dev_attr.attr,
 540        &sensor_dev_attr_in8_min.dev_attr.attr,
 541        &sensor_dev_attr_in8_max.dev_attr.attr,
 542        &sensor_dev_attr_in8_lcrit.dev_attr.attr,
 543        &sensor_dev_attr_in8_crit.dev_attr.attr,
 544        &sensor_dev_attr_in8_crit_alarm.dev_attr.attr,
 545
 546        &sensor_dev_attr_in9_input.dev_attr.attr,
 547        &sensor_dev_attr_in9_min.dev_attr.attr,
 548        &sensor_dev_attr_in9_max.dev_attr.attr,
 549        &sensor_dev_attr_in9_lcrit.dev_attr.attr,
 550        &sensor_dev_attr_in9_crit.dev_attr.attr,
 551        &sensor_dev_attr_in9_crit_alarm.dev_attr.attr,
 552
 553        &sensor_dev_attr_in10_input.dev_attr.attr,
 554        &sensor_dev_attr_in10_min.dev_attr.attr,
 555        &sensor_dev_attr_in10_max.dev_attr.attr,
 556        &sensor_dev_attr_in10_lcrit.dev_attr.attr,
 557        &sensor_dev_attr_in10_crit.dev_attr.attr,
 558        &sensor_dev_attr_in10_crit_alarm.dev_attr.attr,
 559
 560        &sensor_dev_attr_temp1_input.dev_attr.attr,
 561        &sensor_dev_attr_temp1_min.dev_attr.attr,
 562        &sensor_dev_attr_temp1_max.dev_attr.attr,
 563        &sensor_dev_attr_temp1_lcrit.dev_attr.attr,
 564        &sensor_dev_attr_temp1_crit.dev_attr.attr,
 565        &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 566
 567        NULL,
 568};
 569
 570static const struct attribute_group smm665_group = {
 571        .attrs = smm665_attributes,
 572};
 573
 574static int smm665_probe(struct i2c_client *client,
 575                        const struct i2c_device_id *id)
 576{
 577        struct i2c_adapter *adapter = client->adapter;
 578        struct smm665_data *data;
 579        int i, ret;
 580
 581        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
 582                                     | I2C_FUNC_SMBUS_WORD_DATA))
 583                return -ENODEV;
 584
 585        if (i2c_smbus_read_byte_data(client, SMM665_ADOC_ENABLE) < 0)
 586                return -ENODEV;
 587
 588        data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 589        if (!data)
 590                return -ENOMEM;
 591
 592        i2c_set_clientdata(client, data);
 593        mutex_init(&data->update_lock);
 594
 595        data->type = id->driver_data;
 596        data->cmdreg = i2c_new_dummy(adapter, (client->addr & ~SMM665_REGMASK)
 597                                     | SMM665_CMDREG_BASE);
 598        if (!data->cmdreg)
 599                return -ENOMEM;
 600
 601        switch (data->type) {
 602        case smm465:
 603        case smm665:
 604                data->conversion_time = SMM665_ADC_WAIT_SMM665;
 605                break;
 606        case smm665c:
 607        case smm764:
 608        case smm766:
 609                data->conversion_time = SMM665_ADC_WAIT_SMM766;
 610                break;
 611        }
 612
 613        ret = -ENODEV;
 614        if (i2c_smbus_read_byte_data(data->cmdreg, SMM665_MISC8_CMD_STS) < 0)
 615                goto out_unregister;
 616
 617        /*
 618         * Read limits.
 619         *
 620         * Limit registers start with register SMM665_LIMIT_BASE.
 621         * Each channel uses 8 registers, providing four limit values
 622         * per channel. Each limit value requires two registers, with the
 623         * high byte in the first register and the low byte in the second
 624         * register. The first two limits are under limit values, followed
 625         * by two over limit values.
 626         *
 627         * Limit register order matches the ADC register order, so we use
 628         * ADC register defines throughout the code to index limit registers.
 629         *
 630         * We save the first retrieved value both as "critical" and "alarm"
 631         * value. The second value overwrites either the critical or the
 632         * alarm value, depending on its configuration. This ensures that both
 633         * critical and alarm values are initialized, even if both registers are
 634         * configured as critical or non-critical.
 635         */
 636        for (i = 0; i < SMM665_NUM_ADC; i++) {
 637                int val;
 638
 639                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8);
 640                if (unlikely(val < 0))
 641                        goto out_unregister;
 642                data->critical_min_limit[i] = data->alarm_min_limit[i]
 643                  = smm665_convert(val, i);
 644                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 2);
 645                if (unlikely(val < 0))
 646                        goto out_unregister;
 647                if (smm665_is_critical(val))
 648                        data->critical_min_limit[i] = smm665_convert(val, i);
 649                else
 650                        data->alarm_min_limit[i] = smm665_convert(val, i);
 651                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 4);
 652                if (unlikely(val < 0))
 653                        goto out_unregister;
 654                data->critical_max_limit[i] = data->alarm_max_limit[i]
 655                  = smm665_convert(val, i);
 656                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 6);
 657                if (unlikely(val < 0))
 658                        goto out_unregister;
 659                if (smm665_is_critical(val))
 660                        data->critical_max_limit[i] = smm665_convert(val, i);
 661                else
 662                        data->alarm_max_limit[i] = smm665_convert(val, i);
 663        }
 664
 665        /* Register sysfs hooks */
 666        ret = sysfs_create_group(&client->dev.kobj, &smm665_group);
 667        if (ret)
 668                goto out_unregister;
 669
 670        data->hwmon_dev = hwmon_device_register(&client->dev);
 671        if (IS_ERR(data->hwmon_dev)) {
 672                ret = PTR_ERR(data->hwmon_dev);
 673                goto out_remove_group;
 674        }
 675
 676        return 0;
 677
 678out_remove_group:
 679        sysfs_remove_group(&client->dev.kobj, &smm665_group);
 680out_unregister:
 681        i2c_unregister_device(data->cmdreg);
 682        return ret;
 683}
 684
 685static int smm665_remove(struct i2c_client *client)
 686{
 687        struct smm665_data *data = i2c_get_clientdata(client);
 688
 689        i2c_unregister_device(data->cmdreg);
 690        hwmon_device_unregister(data->hwmon_dev);
 691        sysfs_remove_group(&client->dev.kobj, &smm665_group);
 692
 693        return 0;
 694}
 695
 696static const struct i2c_device_id smm665_id[] = {
 697        {"smm465", smm465},
 698        {"smm665", smm665},
 699        {"smm665c", smm665c},
 700        {"smm764", smm764},
 701        {"smm766", smm766},
 702        {}
 703};
 704
 705MODULE_DEVICE_TABLE(i2c, smm665_id);
 706
 707/* This is the driver that will be inserted */
 708static struct i2c_driver smm665_driver = {
 709        .driver = {
 710                   .name = "smm665",
 711                   },
 712        .probe = smm665_probe,
 713        .remove = smm665_remove,
 714        .id_table = smm665_id,
 715};
 716
 717module_i2c_driver(smm665_driver);
 718
 719MODULE_AUTHOR("Guenter Roeck");
 720MODULE_DESCRIPTION("SMM665 driver");
 721MODULE_LICENSE("GPL");
 722
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