LXR linux/drivers/hwmon/smm665.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Driver for SMM665 Power Controller / Monitor
   4 *
   5 * Copyright (C) 2010 Ericsson AB.
   6 *
   7 * This driver should also work for SMM465, SMM764, and SMM766, but is untested
   8 * for those chips. Only monitoring functionality is implemented.
   9 *
  10 * Datasheets:
  11 * http://www.summitmicro.com/prod_select/summary/SMM665/SMM665B_2089_20.pdf
  12 * http://www.summitmicro.com/prod_select/summary/SMM766B/SMM766B_2122.pdf
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/err.h>
  19#include <linux/slab.h>
  20#include <linux/i2c.h>
  21#include <linux/hwmon.h>
  22#include <linux/hwmon-sysfs.h>
  23#include <linux/delay.h>
  24#include <linux/jiffies.h>
  25
  26/* Internal reference voltage (VREF, x 1000 */
  27#define SMM665_VREF_ADC_X1000   1250
  28
  29/* module parameters */
  30static int vref = SMM665_VREF_ADC_X1000;
  31module_param(vref, int, 0);
  32MODULE_PARM_DESC(vref, "Reference voltage in mV");
  33
  34enum chips { smm465, smm665, smm665c, smm764, smm766 };
  35
  36/*
  37 * ADC channel addresses
  38 */
  39#define SMM665_MISC16_ADC_DATA_A        0x00
  40#define SMM665_MISC16_ADC_DATA_B        0x01
  41#define SMM665_MISC16_ADC_DATA_C        0x02
  42#define SMM665_MISC16_ADC_DATA_D        0x03
  43#define SMM665_MISC16_ADC_DATA_E        0x04
  44#define SMM665_MISC16_ADC_DATA_F        0x05
  45#define SMM665_MISC16_ADC_DATA_VDD      0x06
  46#define SMM665_MISC16_ADC_DATA_12V      0x07
  47#define SMM665_MISC16_ADC_DATA_INT_TEMP 0x08
  48#define SMM665_MISC16_ADC_DATA_AIN1     0x09
  49#define SMM665_MISC16_ADC_DATA_AIN2     0x0a
  50
  51/*
  52 * Command registers
  53 */
  54#define SMM665_MISC8_CMD_STS            0x80
  55#define SMM665_MISC8_STATUS1            0x81
  56#define SMM665_MISC8_STATUSS2           0x82
  57#define SMM665_MISC8_IO_POLARITY        0x83
  58#define SMM665_MISC8_PUP_POLARITY       0x84
  59#define SMM665_MISC8_ADOC_STATUS1       0x85
  60#define SMM665_MISC8_ADOC_STATUS2       0x86
  61#define SMM665_MISC8_WRITE_PROT         0x87
  62#define SMM665_MISC8_STS_TRACK          0x88
  63
  64/*
  65 * Configuration registers and register groups
  66 */
  67#define SMM665_ADOC_ENABLE              0x0d
  68#define SMM665_LIMIT_BASE               0x80    /* First limit register */
  69
  70/*
  71 * Limit register bit masks
  72 */
  73#define SMM665_TRIGGER_RST              0x8000
  74#define SMM665_TRIGGER_HEALTHY          0x4000
  75#define SMM665_TRIGGER_POWEROFF         0x2000
  76#define SMM665_TRIGGER_SHUTDOWN         0x1000
  77#define SMM665_ADC_MASK                 0x03ff
  78
  79#define smm665_is_critical(lim) ((lim) & (SMM665_TRIGGER_RST \
  80                                        | SMM665_TRIGGER_POWEROFF \
  81                                        | SMM665_TRIGGER_SHUTDOWN))
  82/*
  83 * Fault register bit definitions
  84 * Values are merged from status registers 1/2,
  85 * with status register 1 providing the upper 8 bits.
  86 */
  87#define SMM665_FAULT_A          0x0001
  88#define SMM665_FAULT_B          0x0002
  89#define SMM665_FAULT_C          0x0004
  90#define SMM665_FAULT_D          0x0008
  91#define SMM665_FAULT_E          0x0010
  92#define SMM665_FAULT_F          0x0020
  93#define SMM665_FAULT_VDD        0x0040
  94#define SMM665_FAULT_12V        0x0080
  95#define SMM665_FAULT_TEMP       0x0100
  96#define SMM665_FAULT_AIN1       0x0200
  97#define SMM665_FAULT_AIN2       0x0400
  98
  99/*
 100 * I2C Register addresses
 101 *
 102 * The configuration register needs to be the configured base register.
 103 * The command/status register address is derived from it.
 104 */
 105#define SMM665_REGMASK          0x78
 106#define SMM665_CMDREG_BASE      0x48
 107#define SMM665_CONFREG_BASE     0x50
 108
 109/*
 110 *  Equations given by chip manufacturer to calculate voltage/temperature values
 111 *  vref = Reference voltage on VREF_ADC pin (module parameter)
 112 *  adc  = 10bit ADC value read back from registers
 113 */
 114
 115/* Voltage A-F and VDD */
 116#define SMM665_VMON_ADC_TO_VOLTS(adc)  ((adc) * vref / 256)
 117
 118/* Voltage 12VIN */
 119#define SMM665_12VIN_ADC_TO_VOLTS(adc) ((adc) * vref * 3 / 256)
 120
 121/* Voltage AIN1, AIN2 */
 122#define SMM665_AIN_ADC_TO_VOLTS(adc)   ((adc) * vref / 512)
 123
 124/* Temp Sensor */
 125#define SMM665_TEMP_ADC_TO_CELSIUS(adc) (((adc) <= 511) ?                  \
 126                                         ((int)(adc) * 1000 / 4) :         \
 127                                         (((int)(adc) - 0x400) * 1000 / 4))
 128
 129#define SMM665_NUM_ADC          11
 130
 131/*
 132 * Chip dependent ADC conversion time, in uS
 133 */
 134#define SMM665_ADC_WAIT_SMM665  70
 135#define SMM665_ADC_WAIT_SMM766  185
 136
 137struct smm665_data {
 138        enum chips type;
 139        int conversion_time;            /* ADC conversion time */
 140        struct i2c_client *client;
 141        struct mutex update_lock;
 142        bool valid;
 143        unsigned long last_updated;     /* in jiffies */
 144        u16 adc[SMM665_NUM_ADC];        /* adc values (raw) */
 145        u16 faults;                     /* fault status */
 146        /* The following values are in mV */
 147        int critical_min_limit[SMM665_NUM_ADC];
 148        int alarm_min_limit[SMM665_NUM_ADC];
 149        int critical_max_limit[SMM665_NUM_ADC];
 150        int alarm_max_limit[SMM665_NUM_ADC];
 151        struct i2c_client *cmdreg;
 152};
 153
 154/*
 155 * smm665_read16()
 156 *
 157 * Read 16 bit value from <reg>, <reg+1>. Upper 8 bits are in <reg>.
 158 */
 159static int smm665_read16(struct i2c_client *client, int reg)
 160{
 161        int rv, val;
 162
 163        rv = i2c_smbus_read_byte_data(client, reg);
 164        if (rv < 0)
 165                return rv;
 166        val = rv << 8;
 167        rv = i2c_smbus_read_byte_data(client, reg + 1);
 168        if (rv < 0)
 169                return rv;
 170        val |= rv;
 171        return val;
 172}
 173
 174/*
 175 * Read adc value.
 176 */
 177static int smm665_read_adc(struct smm665_data *data, int adc)
 178{
 179        struct i2c_client *client = data->cmdreg;
 180        int rv;
 181        int radc;
 182
 183        /*
 184         * Algorithm for reading ADC, per SMM665 datasheet
 185         *
 186         *  {[S][addr][W][Ack]} {[offset][Ack]} {[S][addr][R][Nack]}
 187         * [wait conversion time]
 188         *  {[S][addr][R][Ack]} {[datahi][Ack]} {[datalo][Ack][P]}
 189         *
 190         * To implement the first part of this exchange,
 191         * do a full read transaction and expect a failure/Nack.
 192         * This sets up the address pointer on the SMM665
 193         * and starts the ADC conversion.
 194         * Then do a two-byte read transaction.
 195         */
 196        rv = i2c_smbus_read_byte_data(client, adc << 3);
 197        if (rv != -ENXIO) {
 198                /*
 199                 * We expect ENXIO to reflect NACK
 200                 * (per Documentation/i2c/fault-codes.rst).
 201                 * Everything else is an error.
 202                 */
 203                dev_dbg(&client->dev,
 204                        "Unexpected return code %d when setting ADC index", rv);
 205                return (rv < 0) ? rv : -EIO;
 206        }
 207
 208        udelay(data->conversion_time);
 209
 210        /*
 211         * Now read two bytes.
 212         *
 213         * Neither i2c_smbus_read_byte() nor
 214         * i2c_smbus_read_block_data() worked here,
 215         * so use i2c_smbus_read_word_swapped() instead.
 216         * We could also try to use i2c_master_recv(),
 217         * but that is not always supported.
 218         */
 219        rv = i2c_smbus_read_word_swapped(client, 0);
 220        if (rv < 0) {
 221                dev_dbg(&client->dev, "Failed to read ADC value: error %d", rv);
 222                return rv;
 223        }
 224        /*
 225         * Validate/verify readback adc channel (in bit 11..14).
 226         */
 227        radc = (rv >> 11) & 0x0f;
 228        if (radc != adc) {
 229                dev_dbg(&client->dev, "Unexpected RADC: Expected %d got %d",
 230                        adc, radc);
 231                return -EIO;
 232        }
 233
 234        return rv & SMM665_ADC_MASK;
 235}
 236
 237static struct smm665_data *smm665_update_device(struct device *dev)
 238{
 239        struct smm665_data *data = dev_get_drvdata(dev);
 240        struct i2c_client *client = data->client;
 241        struct smm665_data *ret = data;
 242
 243        mutex_lock(&data->update_lock);
 244
 245        if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 246                int i, val;
 247
 248                /*
 249                 * read status registers
 250                 */
 251                val = smm665_read16(client, SMM665_MISC8_STATUS1);
 252                if (unlikely(val < 0)) {
 253                        ret = ERR_PTR(val);
 254                        goto abort;
 255                }
 256                data->faults = val;
 257
 258                /* Read adc registers */
 259                for (i = 0; i < SMM665_NUM_ADC; i++) {
 260                        val = smm665_read_adc(data, i);
 261                        if (unlikely(val < 0)) {
 262                                ret = ERR_PTR(val);
 263                                goto abort;
 264                        }
 265                        data->adc[i] = val;
 266                }
 267                data->last_updated = jiffies;
 268                data->valid = 1;
 269        }
 270abort:
 271        mutex_unlock(&data->update_lock);
 272        return ret;
 273}
 274
 275/* Return converted value from given adc */
 276static int smm665_convert(u16 adcval, int index)
 277{
 278        int val = 0;
 279
 280        switch (index) {
 281        case SMM665_MISC16_ADC_DATA_12V:
 282                val = SMM665_12VIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 283                break;
 284
 285        case SMM665_MISC16_ADC_DATA_VDD:
 286        case SMM665_MISC16_ADC_DATA_A:
 287        case SMM665_MISC16_ADC_DATA_B:
 288        case SMM665_MISC16_ADC_DATA_C:
 289        case SMM665_MISC16_ADC_DATA_D:
 290        case SMM665_MISC16_ADC_DATA_E:
 291        case SMM665_MISC16_ADC_DATA_F:
 292                val = SMM665_VMON_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 293                break;
 294
 295        case SMM665_MISC16_ADC_DATA_AIN1:
 296        case SMM665_MISC16_ADC_DATA_AIN2:
 297                val = SMM665_AIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 298                break;
 299
 300        case SMM665_MISC16_ADC_DATA_INT_TEMP:
 301                val = SMM665_TEMP_ADC_TO_CELSIUS(adcval & SMM665_ADC_MASK);
 302                break;
 303
 304        default:
 305                /* If we get here, the developer messed up */
 306                WARN_ON_ONCE(1);
 307                break;
 308        }
 309
 310        return val;
 311}
 312
 313static int smm665_get_min(struct device *dev, int index)
 314{
 315        struct smm665_data *data = dev_get_drvdata(dev);
 316
 317        return data->alarm_min_limit[index];
 318}
 319
 320static int smm665_get_max(struct device *dev, int index)
 321{
 322        struct smm665_data *data = dev_get_drvdata(dev);
 323
 324        return data->alarm_max_limit[index];
 325}
 326
 327static int smm665_get_lcrit(struct device *dev, int index)
 328{
 329        struct smm665_data *data = dev_get_drvdata(dev);
 330
 331        return data->critical_min_limit[index];
 332}
 333
 334static int smm665_get_crit(struct device *dev, int index)
 335{
 336        struct smm665_data *data = dev_get_drvdata(dev);
 337
 338        return data->critical_max_limit[index];
 339}
 340
 341static ssize_t smm665_show_crit_alarm(struct device *dev,
 342                                      struct device_attribute *da, char *buf)
 343{
 344        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 345        struct smm665_data *data = smm665_update_device(dev);
 346        int val = 0;
 347
 348        if (IS_ERR(data))
 349                return PTR_ERR(data);
 350
 351        if (data->faults & (1 << attr->index))
 352                val = 1;
 353
 354        return snprintf(buf, PAGE_SIZE, "%d\n", val);
 355}
 356
 357static ssize_t smm665_show_input(struct device *dev,
 358                                 struct device_attribute *da, char *buf)
 359{
 360        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 361        struct smm665_data *data = smm665_update_device(dev);
 362        int adc = attr->index;
 363        int val;
 364
 365        if (IS_ERR(data))
 366                return PTR_ERR(data);
 367
 368        val = smm665_convert(data->adc[adc], adc);
 369        return snprintf(buf, PAGE_SIZE, "%d\n", val);
 370}
 371
 372#define SMM665_SHOW(what) \
 373static ssize_t smm665_show_##what(struct device *dev, \
 374                                    struct device_attribute *da, char *buf) \
 375{ \
 376        struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
 377        const int val = smm665_get_##what(dev, attr->index); \
 378        return snprintf(buf, PAGE_SIZE, "%d\n", val); \
 379}
 380
 381SMM665_SHOW(min);
 382SMM665_SHOW(max);
 383SMM665_SHOW(lcrit);
 384SMM665_SHOW(crit);
 385
 386/*
 387 * These macros are used below in constructing device attribute objects
 388 * for use with sysfs_create_group() to make a sysfs device file
 389 * for each register.
 390 */
 391
 392#define SMM665_ATTR(name, type, cmd_idx) \
 393        static SENSOR_DEVICE_ATTR(name##_##type, S_IRUGO, \
 394                                  smm665_show_##type, NULL, cmd_idx)
 395
 396/* Construct a sensor_device_attribute structure for each register */
 397
 398/* Input voltages */
 399SMM665_ATTR(in1, input, SMM665_MISC16_ADC_DATA_12V);
 400SMM665_ATTR(in2, input, SMM665_MISC16_ADC_DATA_VDD);
 401SMM665_ATTR(in3, input, SMM665_MISC16_ADC_DATA_A);
 402SMM665_ATTR(in4, input, SMM665_MISC16_ADC_DATA_B);
 403SMM665_ATTR(in5, input, SMM665_MISC16_ADC_DATA_C);
 404SMM665_ATTR(in6, input, SMM665_MISC16_ADC_DATA_D);
 405SMM665_ATTR(in7, input, SMM665_MISC16_ADC_DATA_E);
 406SMM665_ATTR(in8, input, SMM665_MISC16_ADC_DATA_F);
 407SMM665_ATTR(in9, input, SMM665_MISC16_ADC_DATA_AIN1);
 408SMM665_ATTR(in10, input, SMM665_MISC16_ADC_DATA_AIN2);
 409
 410/* Input voltages min */
 411SMM665_ATTR(in1, min, SMM665_MISC16_ADC_DATA_12V);
 412SMM665_ATTR(in2, min, SMM665_MISC16_ADC_DATA_VDD);
 413SMM665_ATTR(in3, min, SMM665_MISC16_ADC_DATA_A);
 414SMM665_ATTR(in4, min, SMM665_MISC16_ADC_DATA_B);
 415SMM665_ATTR(in5, min, SMM665_MISC16_ADC_DATA_C);
 416SMM665_ATTR(in6, min, SMM665_MISC16_ADC_DATA_D);
 417SMM665_ATTR(in7, min, SMM665_MISC16_ADC_DATA_E);
 418SMM665_ATTR(in8, min, SMM665_MISC16_ADC_DATA_F);
 419SMM665_ATTR(in9, min, SMM665_MISC16_ADC_DATA_AIN1);
 420SMM665_ATTR(in10, min, SMM665_MISC16_ADC_DATA_AIN2);
 421
 422/* Input voltages max */
 423SMM665_ATTR(in1, max, SMM665_MISC16_ADC_DATA_12V);
 424SMM665_ATTR(in2, max, SMM665_MISC16_ADC_DATA_VDD);
 425SMM665_ATTR(in3, max, SMM665_MISC16_ADC_DATA_A);
 426SMM665_ATTR(in4, max, SMM665_MISC16_ADC_DATA_B);
 427SMM665_ATTR(in5, max, SMM665_MISC16_ADC_DATA_C);
 428SMM665_ATTR(in6, max, SMM665_MISC16_ADC_DATA_D);
 429SMM665_ATTR(in7, max, SMM665_MISC16_ADC_DATA_E);
 430SMM665_ATTR(in8, max, SMM665_MISC16_ADC_DATA_F);
 431SMM665_ATTR(in9, max, SMM665_MISC16_ADC_DATA_AIN1);
 432SMM665_ATTR(in10, max, SMM665_MISC16_ADC_DATA_AIN2);
 433
 434/* Input voltages lcrit */
 435SMM665_ATTR(in1, lcrit, SMM665_MISC16_ADC_DATA_12V);
 436SMM665_ATTR(in2, lcrit, SMM665_MISC16_ADC_DATA_VDD);
 437SMM665_ATTR(in3, lcrit, SMM665_MISC16_ADC_DATA_A);
 438SMM665_ATTR(in4, lcrit, SMM665_MISC16_ADC_DATA_B);
 439SMM665_ATTR(in5, lcrit, SMM665_MISC16_ADC_DATA_C);
 440SMM665_ATTR(in6, lcrit, SMM665_MISC16_ADC_DATA_D);
 441SMM665_ATTR(in7, lcrit, SMM665_MISC16_ADC_DATA_E);
 442SMM665_ATTR(in8, lcrit, SMM665_MISC16_ADC_DATA_F);
 443SMM665_ATTR(in9, lcrit, SMM665_MISC16_ADC_DATA_AIN1);
 444SMM665_ATTR(in10, lcrit, SMM665_MISC16_ADC_DATA_AIN2);
 445
 446/* Input voltages crit */
 447SMM665_ATTR(in1, crit, SMM665_MISC16_ADC_DATA_12V);
 448SMM665_ATTR(in2, crit, SMM665_MISC16_ADC_DATA_VDD);
 449SMM665_ATTR(in3, crit, SMM665_MISC16_ADC_DATA_A);
 450SMM665_ATTR(in4, crit, SMM665_MISC16_ADC_DATA_B);
 451SMM665_ATTR(in5, crit, SMM665_MISC16_ADC_DATA_C);
 452SMM665_ATTR(in6, crit, SMM665_MISC16_ADC_DATA_D);
 453SMM665_ATTR(in7, crit, SMM665_MISC16_ADC_DATA_E);
 454SMM665_ATTR(in8, crit, SMM665_MISC16_ADC_DATA_F);
 455SMM665_ATTR(in9, crit, SMM665_MISC16_ADC_DATA_AIN1);
 456SMM665_ATTR(in10, crit, SMM665_MISC16_ADC_DATA_AIN2);
 457
 458/* critical alarms */
 459SMM665_ATTR(in1, crit_alarm, SMM665_FAULT_12V);
 460SMM665_ATTR(in2, crit_alarm, SMM665_FAULT_VDD);
 461SMM665_ATTR(in3, crit_alarm, SMM665_FAULT_A);
 462SMM665_ATTR(in4, crit_alarm, SMM665_FAULT_B);
 463SMM665_ATTR(in5, crit_alarm, SMM665_FAULT_C);
 464SMM665_ATTR(in6, crit_alarm, SMM665_FAULT_D);
 465SMM665_ATTR(in7, crit_alarm, SMM665_FAULT_E);
 466SMM665_ATTR(in8, crit_alarm, SMM665_FAULT_F);
 467SMM665_ATTR(in9, crit_alarm, SMM665_FAULT_AIN1);
 468SMM665_ATTR(in10, crit_alarm, SMM665_FAULT_AIN2);
 469
 470/* Temperature */
 471SMM665_ATTR(temp1, input, SMM665_MISC16_ADC_DATA_INT_TEMP);
 472SMM665_ATTR(temp1, min, SMM665_MISC16_ADC_DATA_INT_TEMP);
 473SMM665_ATTR(temp1, max, SMM665_MISC16_ADC_DATA_INT_TEMP);
 474SMM665_ATTR(temp1, lcrit, SMM665_MISC16_ADC_DATA_INT_TEMP);
 475SMM665_ATTR(temp1, crit, SMM665_MISC16_ADC_DATA_INT_TEMP);
 476SMM665_ATTR(temp1, crit_alarm, SMM665_FAULT_TEMP);
 477
 478/*
 479 * Finally, construct an array of pointers to members of the above objects,
 480 * as required for sysfs_create_group()
 481 */
 482static struct attribute *smm665_attrs[] = {
 483        &sensor_dev_attr_in1_input.dev_attr.attr,
 484        &sensor_dev_attr_in1_min.dev_attr.attr,
 485        &sensor_dev_attr_in1_max.dev_attr.attr,
 486        &sensor_dev_attr_in1_lcrit.dev_attr.attr,
 487        &sensor_dev_attr_in1_crit.dev_attr.attr,
 488        &sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
 489
 490        &sensor_dev_attr_in2_input.dev_attr.attr,
 491        &sensor_dev_attr_in2_min.dev_attr.attr,
 492        &sensor_dev_attr_in2_max.dev_attr.attr,
 493        &sensor_dev_attr_in2_lcrit.dev_attr.attr,
 494        &sensor_dev_attr_in2_crit.dev_attr.attr,
 495        &sensor_dev_attr_in2_crit_alarm.dev_attr.attr,
 496
 497        &sensor_dev_attr_in3_input.dev_attr.attr,
 498        &sensor_dev_attr_in3_min.dev_attr.attr,
 499        &sensor_dev_attr_in3_max.dev_attr.attr,
 500        &sensor_dev_attr_in3_lcrit.dev_attr.attr,
 501        &sensor_dev_attr_in3_crit.dev_attr.attr,
 502        &sensor_dev_attr_in3_crit_alarm.dev_attr.attr,
 503
 504        &sensor_dev_attr_in4_input.dev_attr.attr,
 505        &sensor_dev_attr_in4_min.dev_attr.attr,
 506        &sensor_dev_attr_in4_max.dev_attr.attr,
 507        &sensor_dev_attr_in4_lcrit.dev_attr.attr,
 508        &sensor_dev_attr_in4_crit.dev_attr.attr,
 509        &sensor_dev_attr_in4_crit_alarm.dev_attr.attr,
 510
 511        &sensor_dev_attr_in5_input.dev_attr.attr,
 512        &sensor_dev_attr_in5_min.dev_attr.attr,
 513        &sensor_dev_attr_in5_max.dev_attr.attr,
 514        &sensor_dev_attr_in5_lcrit.dev_attr.attr,
 515        &sensor_dev_attr_in5_crit.dev_attr.attr,
 516        &sensor_dev_attr_in5_crit_alarm.dev_attr.attr,
 517
 518        &sensor_dev_attr_in6_input.dev_attr.attr,
 519        &sensor_dev_attr_in6_min.dev_attr.attr,
 520        &sensor_dev_attr_in6_max.dev_attr.attr,
 521        &sensor_dev_attr_in6_lcrit.dev_attr.attr,
 522        &sensor_dev_attr_in6_crit.dev_attr.attr,
 523        &sensor_dev_attr_in6_crit_alarm.dev_attr.attr,
 524
 525        &sensor_dev_attr_in7_input.dev_attr.attr,
 526        &sensor_dev_attr_in7_min.dev_attr.attr,
 527        &sensor_dev_attr_in7_max.dev_attr.attr,
 528        &sensor_dev_attr_in7_lcrit.dev_attr.attr,
 529        &sensor_dev_attr_in7_crit.dev_attr.attr,
 530        &sensor_dev_attr_in7_crit_alarm.dev_attr.attr,
 531
 532        &sensor_dev_attr_in8_input.dev_attr.attr,
 533        &sensor_dev_attr_in8_min.dev_attr.attr,
 534        &sensor_dev_attr_in8_max.dev_attr.attr,
 535        &sensor_dev_attr_in8_lcrit.dev_attr.attr,
 536        &sensor_dev_attr_in8_crit.dev_attr.attr,
 537        &sensor_dev_attr_in8_crit_alarm.dev_attr.attr,
 538
 539        &sensor_dev_attr_in9_input.dev_attr.attr,
 540        &sensor_dev_attr_in9_min.dev_attr.attr,
 541        &sensor_dev_attr_in9_max.dev_attr.attr,
 542        &sensor_dev_attr_in9_lcrit.dev_attr.attr,
 543        &sensor_dev_attr_in9_crit.dev_attr.attr,
 544        &sensor_dev_attr_in9_crit_alarm.dev_attr.attr,
 545
 546        &sensor_dev_attr_in10_input.dev_attr.attr,
 547        &sensor_dev_attr_in10_min.dev_attr.attr,
 548        &sensor_dev_attr_in10_max.dev_attr.attr,
 549        &sensor_dev_attr_in10_lcrit.dev_attr.attr,
 550        &sensor_dev_attr_in10_crit.dev_attr.attr,
 551        &sensor_dev_attr_in10_crit_alarm.dev_attr.attr,
 552
 553        &sensor_dev_attr_temp1_input.dev_attr.attr,
 554        &sensor_dev_attr_temp1_min.dev_attr.attr,
 555        &sensor_dev_attr_temp1_max.dev_attr.attr,
 556        &sensor_dev_attr_temp1_lcrit.dev_attr.attr,
 557        &sensor_dev_attr_temp1_crit.dev_attr.attr,
 558        &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 559
 560        NULL,
 561};
 562
 563ATTRIBUTE_GROUPS(smm665);
 564
 565static int smm665_probe(struct i2c_client *client,
 566                        const struct i2c_device_id *id)
 567{
 568        struct i2c_adapter *adapter = client->adapter;
 569        struct smm665_data *data;
 570        struct device *hwmon_dev;
 571        int i, ret;
 572
 573        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
 574                                     | I2C_FUNC_SMBUS_WORD_DATA))
 575                return -ENODEV;
 576
 577        if (i2c_smbus_read_byte_data(client, SMM665_ADOC_ENABLE) < 0)
 578                return -ENODEV;
 579
 580        data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 581        if (!data)
 582                return -ENOMEM;
 583
 584        i2c_set_clientdata(client, data);
 585        mutex_init(&data->update_lock);
 586
 587        data->client = client;
 588        data->type = id->driver_data;
 589        data->cmdreg = i2c_new_dummy_device(adapter, (client->addr & ~SMM665_REGMASK)
 590                                     | SMM665_CMDREG_BASE);
 591        if (IS_ERR(data->cmdreg))
 592                return PTR_ERR(data->cmdreg);
 593
 594        switch (data->type) {
 595        case smm465:
 596        case smm665:
 597                data->conversion_time = SMM665_ADC_WAIT_SMM665;
 598                break;
 599        case smm665c:
 600        case smm764:
 601        case smm766:
 602                data->conversion_time = SMM665_ADC_WAIT_SMM766;
 603                break;
 604        }
 605
 606        ret = -ENODEV;
 607        if (i2c_smbus_read_byte_data(data->cmdreg, SMM665_MISC8_CMD_STS) < 0)
 608                goto out_unregister;
 609
 610        /*
 611         * Read limits.
 612         *
 613         * Limit registers start with register SMM665_LIMIT_BASE.
 614         * Each channel uses 8 registers, providing four limit values
 615         * per channel. Each limit value requires two registers, with the
 616         * high byte in the first register and the low byte in the second
 617         * register. The first two limits are under limit values, followed
 618         * by two over limit values.
 619         *
 620         * Limit register order matches the ADC register order, so we use
 621         * ADC register defines throughout the code to index limit registers.
 622         *
 623         * We save the first retrieved value both as "critical" and "alarm"
 624         * value. The second value overwrites either the critical or the
 625         * alarm value, depending on its configuration. This ensures that both
 626         * critical and alarm values are initialized, even if both registers are
 627         * configured as critical or non-critical.
 628         */
 629        for (i = 0; i < SMM665_NUM_ADC; i++) {
 630                int val;
 631
 632                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8);
 633                if (unlikely(val < 0))
 634                        goto out_unregister;
 635                data->critical_min_limit[i] = data->alarm_min_limit[i]
 636                  = smm665_convert(val, i);
 637                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 2);
 638                if (unlikely(val < 0))
 639                        goto out_unregister;
 640                if (smm665_is_critical(val))
 641                        data->critical_min_limit[i] = smm665_convert(val, i);
 642                else
 643                        data->alarm_min_limit[i] = smm665_convert(val, i);
 644                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 4);
 645                if (unlikely(val < 0))
 646                        goto out_unregister;
 647                data->critical_max_limit[i] = data->alarm_max_limit[i]
 648                  = smm665_convert(val, i);
 649                val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 6);
 650                if (unlikely(val < 0))
 651                        goto out_unregister;
 652                if (smm665_is_critical(val))
 653                        data->critical_max_limit[i] = smm665_convert(val, i);
 654                else
 655                        data->alarm_max_limit[i] = smm665_convert(val, i);
 656        }
 657
 658        hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
 659                                                           client->name, data,
 660                                                           smm665_groups);
 661        if (IS_ERR(hwmon_dev)) {
 662                ret = PTR_ERR(hwmon_dev);
 663                goto out_unregister;
 664        }
 665
 666        return 0;
 667
 668out_unregister:
 669        i2c_unregister_device(data->cmdreg);
 670        return ret;
 671}
 672
 673static int smm665_remove(struct i2c_client *client)
 674{
 675        struct smm665_data *data = i2c_get_clientdata(client);
 676
 677        i2c_unregister_device(data->cmdreg);
 678        return 0;
 679}
 680
 681static const struct i2c_device_id smm665_id[] = {
 682        {"smm465", smm465},
 683        {"smm665", smm665},
 684        {"smm665c", smm665c},
 685        {"smm764", smm764},
 686        {"smm766", smm766},
 687        {}
 688};
 689
 690MODULE_DEVICE_TABLE(i2c, smm665_id);
 691
 692/* This is the driver that will be inserted */
 693static struct i2c_driver smm665_driver = {
 694        .driver = {
 695                   .name = "smm665",
 696                   },
 697        .probe = smm665_probe,
 698        .remove = smm665_remove,
 699        .id_table = smm665_id,
 700};
 701
 702module_i2c_driver(smm665_driver);
 703
 704MODULE_AUTHOR("Guenter Roeck");
 705MODULE_DESCRIPTION("SMM665 driver");
 706MODULE_LICENSE("GPL");
 707