drivers/hwmon/smm665.c

   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 */
  32 static int vref = SMM665_VREF_ADC_X1000;
  33 module_param(vref, int, 0);
  34 MODULE_PARM_DESC(vref, "Reference voltage in mV");
  35
  36 enum 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
 139 struct 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  */
 161 static 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  */
 179 static 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_data() 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_data(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          * High byte is in lower 8 bit of rv, so only shift by 3.
 229          */
 230         radc = (rv >> 3) & 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          * Chip replies with H/L, while SMBus expects L/H.
 238          * Thus, byte order is reversed, and we have to swap
 239          * the result.
 240          */
 241         rv = swab16(rv) & SMM665_ADC_MASK;
 242
 243         return rv;
 244 }
 245
 246 static struct smm665_data *smm665_update_device(struct device *dev)
 247 {
 248         struct i2c_client *client = to_i2c_client(dev);
 249         struct smm665_data *data = i2c_get_clientdata(client);
 250         struct smm665_data *ret = data;
 251
 252         mutex_lock(&data->update_lock);
 253
 254         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 255                 int i, val;
 256
 257                 /*
 258                  * read status registers
 259                  */
 260                 val = smm665_read16(client, SMM665_MISC8_STATUS1);
 261                 if (unlikely(val < 0)) {
 262                         ret = ERR_PTR(val);
 263                         goto abort;
 264                 }
 265                 data->faults = val;
 266
 267                 /* Read adc registers */
 268                 for (i = 0; i < SMM665_NUM_ADC; i++) {
 269                         val = smm665_read_adc(data, i);
 270                         if (unlikely(val < 0)) {
 271                                 ret = ERR_PTR(val);
 272                                 goto abort;
 273                         }
 274                         data->adc[i] = val;
 275                 }
 276                 data->last_updated = jiffies;
 277                 data->valid = 1;
 278         }
 279 abort:
 280         mutex_unlock(&data->update_lock);
 281         return ret;
 282 }
 283
 284 /* Return converted value from given adc */
 285 static int smm665_convert(u16 adcval, int index)
 286 {
 287         int val = 0;
 288
 289         switch (index) {
 290         case SMM665_MISC16_ADC_DATA_12V:
 291                 val = SMM665_12VIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 292                 break;
 293
 294         case SMM665_MISC16_ADC_DATA_VDD:
 295         case SMM665_MISC16_ADC_DATA_A:
 296         case SMM665_MISC16_ADC_DATA_B:
 297         case SMM665_MISC16_ADC_DATA_C:
 298         case SMM665_MISC16_ADC_DATA_D:
 299         case SMM665_MISC16_ADC_DATA_E:
 300         case SMM665_MISC16_ADC_DATA_F:
 301                 val = SMM665_VMON_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 302                 break;
 303
 304         case SMM665_MISC16_ADC_DATA_AIN1:
 305         case SMM665_MISC16_ADC_DATA_AIN2:
 306                 val = SMM665_AIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
 307                 break;
 308
 309         case SMM665_MISC16_ADC_DATA_INT_TEMP:
 310                 val = SMM665_TEMP_ADC_TO_CELSIUS(adcval & SMM665_ADC_MASK);
 311                 break;
 312
 313         default:
 314                 /* If we get here, the developer messed up */
 315                 WARN_ON_ONCE(1);
 316                 break;
 317         }
 318
 319         return val;
 320 }
 321
 322 static int smm665_get_min(struct device *dev, int index)
 323 {
 324         struct i2c_client *client = to_i2c_client(dev);
 325         struct smm665_data *data = i2c_get_clientdata(client);
 326
 327         return data->alarm_min_limit[index];
 328 }
 329
 330 static int smm665_get_max(struct device *dev, int index)
 331 {
 332         struct i2c_client *client = to_i2c_client(dev);
 333         struct smm665_data *data = i2c_get_clientdata(client);
 334
 335         return data->alarm_max_limit[index];
 336 }
 337
 338 static int smm665_get_lcrit(struct device *dev, int index)
 339 {
 340         struct i2c_client *client = to_i2c_client(dev);
 341         struct smm665_data *data = i2c_get_clientdata(client);
 342
 343         return data->critical_min_limit[index];
 344 }
 345
 346 static int smm665_get_crit(struct device *dev, int index)
 347 {
 348         struct i2c_client *client = to_i2c_client(dev);
 349         struct smm665_data *data = i2c_get_clientdata(client);
 350
 351         return data->critical_max_limit[index];
 352 }
 353
 354 static ssize_t smm665_show_crit_alarm(struct device *dev,
 355                                       struct device_attribute *da, char *buf)
 356 {
 357         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 358         struct smm665_data *data = smm665_update_device(dev);
 359         int val = 0;
 360
 361         if (IS_ERR(data))
 362                 return PTR_ERR(data);
 363
 364         if (data->faults & (1 << attr->index))
 365                 val = 1;
 366
 367         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 368 }
 369
 370 static ssize_t smm665_show_input(struct device *dev,
 371                                  struct device_attribute *da, char *buf)
 372 {
 373         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 374         struct smm665_data *data = smm665_update_device(dev);
 375         int adc = attr->index;
 376         int val;
 377
 378         if (IS_ERR(data))
 379                 return PTR_ERR(data);
 380
 381         val = smm665_convert(data->adc[adc], adc);
 382         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 383 }
 384
 385 #define SMM665_SHOW(what) \
 386   static ssize_t smm665_show_##what(struct device *dev, \
 387                                     struct device_attribute *da, char *buf) \
 388 { \
 389         struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
 390         const int val = smm665_get_##what(dev, attr->index); \
 391         return snprintf(buf, PAGE_SIZE, "%d\n", val); \
 392 }
 393
 394 SMM665_SHOW(min);
 395 SMM665_SHOW(max);
 396 SMM665_SHOW(lcrit);
 397 SMM665_SHOW(crit);
 398
 399 /* These macros are used below in constructing device attribute objects
 400  * for use with sysfs_create_group() to make a sysfs device file
 401  * for each register.
 402  */
 403
 404 #define SMM665_ATTR(name, type, cmd_idx) \
 405         static SENSOR_DEVICE_ATTR(name##_##type, S_IRUGO, \
 406                                   smm665_show_##type, NULL, cmd_idx)
 407
 408 /* Construct a sensor_device_attribute structure for each register */
 409
 410 /* Input voltages */
 411 SMM665_ATTR(in1, input, SMM665_MISC16_ADC_DATA_12V);
 412 SMM665_ATTR(in2, input, SMM665_MISC16_ADC_DATA_VDD);
 413 SMM665_ATTR(in3, input, SMM665_MISC16_ADC_DATA_A);
 414 SMM665_ATTR(in4, input, SMM665_MISC16_ADC_DATA_B);
 415 SMM665_ATTR(in5, input, SMM665_MISC16_ADC_DATA_C);
 416 SMM665_ATTR(in6, input, SMM665_MISC16_ADC_DATA_D);
 417 SMM665_ATTR(in7, input, SMM665_MISC16_ADC_DATA_E);
 418 SMM665_ATTR(in8, input, SMM665_MISC16_ADC_DATA_F);
 419 SMM665_ATTR(in9, input, SMM665_MISC16_ADC_DATA_AIN1);
 420 SMM665_ATTR(in10, input, SMM665_MISC16_ADC_DATA_AIN2);
 421
 422 /* Input voltages min */
 423 SMM665_ATTR(in1, min, SMM665_MISC16_ADC_DATA_12V);
 424 SMM665_ATTR(in2, min, SMM665_MISC16_ADC_DATA_VDD);
 425 SMM665_ATTR(in3, min, SMM665_MISC16_ADC_DATA_A);
 426 SMM665_ATTR(in4, min, SMM665_MISC16_ADC_DATA_B);
 427 SMM665_ATTR(in5, min, SMM665_MISC16_ADC_DATA_C);
 428 SMM665_ATTR(in6, min, SMM665_MISC16_ADC_DATA_D);
 429 SMM665_ATTR(in7, min, SMM665_MISC16_ADC_DATA_E);
 430 SMM665_ATTR(in8, min, SMM665_MISC16_ADC_DATA_F);
 431 SMM665_ATTR(in9, min, SMM665_MISC16_ADC_DATA_AIN1);
 432 SMM665_ATTR(in10, min, SMM665_MISC16_ADC_DATA_AIN2);
 433
 434 /* Input voltages max */
 435 SMM665_ATTR(in1, max, SMM665_MISC16_ADC_DATA_12V);
 436 SMM665_ATTR(in2, max, SMM665_MISC16_ADC_DATA_VDD);
 437 SMM665_ATTR(in3, max, SMM665_MISC16_ADC_DATA_A);
 438 SMM665_ATTR(in4, max, SMM665_MISC16_ADC_DATA_B);
 439 SMM665_ATTR(in5, max, SMM665_MISC16_ADC_DATA_C);
 440 SMM665_ATTR(in6, max, SMM665_MISC16_ADC_DATA_D);
 441 SMM665_ATTR(in7, max, SMM665_MISC16_ADC_DATA_E);
 442 SMM665_ATTR(in8, max, SMM665_MISC16_ADC_DATA_F);
 443 SMM665_ATTR(in9, max, SMM665_MISC16_ADC_DATA_AIN1);
 444 SMM665_ATTR(in10, max, SMM665_MISC16_ADC_DATA_AIN2);
 445
 446 /* Input voltages lcrit */
 447 SMM665_ATTR(in1, lcrit, SMM665_MISC16_ADC_DATA_12V);
 448 SMM665_ATTR(in2, lcrit, SMM665_MISC16_ADC_DATA_VDD);
 449 SMM665_ATTR(in3, lcrit, SMM665_MISC16_ADC_DATA_A);
 450 SMM665_ATTR(in4, lcrit, SMM665_MISC16_ADC_DATA_B);
 451 SMM665_ATTR(in5, lcrit, SMM665_MISC16_ADC_DATA_C);
 452 SMM665_ATTR(in6, lcrit, SMM665_MISC16_ADC_DATA_D);
 453 SMM665_ATTR(in7, lcrit, SMM665_MISC16_ADC_DATA_E);
 454 SMM665_ATTR(in8, lcrit, SMM665_MISC16_ADC_DATA_F);
 455 SMM665_ATTR(in9, lcrit, SMM665_MISC16_ADC_DATA_AIN1);
 456 SMM665_ATTR(in10, lcrit, SMM665_MISC16_ADC_DATA_AIN2);
 457
 458 /* Input voltages crit */
 459 SMM665_ATTR(in1, crit, SMM665_MISC16_ADC_DATA_12V);
 460 SMM665_ATTR(in2, crit, SMM665_MISC16_ADC_DATA_VDD);
 461 SMM665_ATTR(in3, crit, SMM665_MISC16_ADC_DATA_A);
 462 SMM665_ATTR(in4, crit, SMM665_MISC16_ADC_DATA_B);
 463 SMM665_ATTR(in5, crit, SMM665_MISC16_ADC_DATA_C);
 464 SMM665_ATTR(in6, crit, SMM665_MISC16_ADC_DATA_D);
 465 SMM665_ATTR(in7, crit, SMM665_MISC16_ADC_DATA_E);
 466 SMM665_ATTR(in8, crit, SMM665_MISC16_ADC_DATA_F);
 467 SMM665_ATTR(in9, crit, SMM665_MISC16_ADC_DATA_AIN1);
 468 SMM665_ATTR(in10, crit, SMM665_MISC16_ADC_DATA_AIN2);
 469
 470 /* critical alarms */
 471 SMM665_ATTR(in1, crit_alarm, SMM665_FAULT_12V);
 472 SMM665_ATTR(in2, crit_alarm, SMM665_FAULT_VDD);
 473 SMM665_ATTR(in3, crit_alarm, SMM665_FAULT_A);
 474 SMM665_ATTR(in4, crit_alarm, SMM665_FAULT_B);
 475 SMM665_ATTR(in5, crit_alarm, SMM665_FAULT_C);
 476 SMM665_ATTR(in6, crit_alarm, SMM665_FAULT_D);
 477 SMM665_ATTR(in7, crit_alarm, SMM665_FAULT_E);
 478 SMM665_ATTR(in8, crit_alarm, SMM665_FAULT_F);
 479 SMM665_ATTR(in9, crit_alarm, SMM665_FAULT_AIN1);
 480 SMM665_ATTR(in10, crit_alarm, SMM665_FAULT_AIN2);
 481
 482 /* Temperature */
 483 SMM665_ATTR(temp1, input, SMM665_MISC16_ADC_DATA_INT_TEMP);
 484 SMM665_ATTR(temp1, min, SMM665_MISC16_ADC_DATA_INT_TEMP);
 485 SMM665_ATTR(temp1, max, SMM665_MISC16_ADC_DATA_INT_TEMP);
 486 SMM665_ATTR(temp1, lcrit, SMM665_MISC16_ADC_DATA_INT_TEMP);
 487 SMM665_ATTR(temp1, crit, SMM665_MISC16_ADC_DATA_INT_TEMP);
 488 SMM665_ATTR(temp1, crit_alarm, SMM665_FAULT_TEMP);
 489
 490 /*
 491  * Finally, construct an array of pointers to members of the above objects,
 492  * as required for sysfs_create_group()
 493  */
 494 static struct attribute *smm665_attributes[] = {
 495         &sensor_dev_attr_in1_input.dev_attr.attr,
 496         &sensor_dev_attr_in1_min.dev_attr.attr,
 497         &sensor_dev_attr_in1_max.dev_attr.attr,
 498         &sensor_dev_attr_in1_lcrit.dev_attr.attr,
 499         &sensor_dev_attr_in1_crit.dev_attr.attr,
 500         &sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
 501
 502         &sensor_dev_attr_in2_input.dev_attr.attr,
 503         &sensor_dev_attr_in2_min.dev_attr.attr,
 504         &sensor_dev_attr_in2_max.dev_attr.attr,
 505         &sensor_dev_attr_in2_lcrit.dev_attr.attr,
 506         &sensor_dev_attr_in2_crit.dev_attr.attr,
 507         &sensor_dev_attr_in2_crit_alarm.dev_attr.attr,
 508
 509         &sensor_dev_attr_in3_input.dev_attr.attr,
 510         &sensor_dev_attr_in3_min.dev_attr.attr,
 511         &sensor_dev_attr_in3_max.dev_attr.attr,
 512         &sensor_dev_attr_in3_lcrit.dev_attr.attr,
 513         &sensor_dev_attr_in3_crit.dev_attr.attr,
 514         &sensor_dev_attr_in3_crit_alarm.dev_attr.attr,
 515
 516         &sensor_dev_attr_in4_input.dev_attr.attr,
 517         &sensor_dev_attr_in4_min.dev_attr.attr,
 518         &sensor_dev_attr_in4_max.dev_attr.attr,
 519         &sensor_dev_attr_in4_lcrit.dev_attr.attr,
 520         &sensor_dev_attr_in4_crit.dev_attr.attr,
 521         &sensor_dev_attr_in4_crit_alarm.dev_attr.attr,
 522
 523         &sensor_dev_attr_in5_input.dev_attr.attr,
 524         &sensor_dev_attr_in5_min.dev_attr.attr,
 525         &sensor_dev_attr_in5_max.dev_attr.attr,
 526         &sensor_dev_attr_in5_lcrit.dev_attr.attr,
 527         &sensor_dev_attr_in5_crit.dev_attr.attr,
 528         &sensor_dev_attr_in5_crit_alarm.dev_attr.attr,
 529
 530         &sensor_dev_attr_in6_input.dev_attr.attr,
 531         &sensor_dev_attr_in6_min.dev_attr.attr,
 532         &sensor_dev_attr_in6_max.dev_attr.attr,
 533         &sensor_dev_attr_in6_lcrit.dev_attr.attr,
 534         &sensor_dev_attr_in6_crit.dev_attr.attr,
 535         &sensor_dev_attr_in6_crit_alarm.dev_attr.attr,
 536
 537         &sensor_dev_attr_in7_input.dev_attr.attr,
 538         &sensor_dev_attr_in7_min.dev_attr.attr,
 539         &sensor_dev_attr_in7_max.dev_attr.attr,
 540         &sensor_dev_attr_in7_lcrit.dev_attr.attr,
 541         &sensor_dev_attr_in7_crit.dev_attr.attr,
 542         &sensor_dev_attr_in7_crit_alarm.dev_attr.attr,
 543
 544         &sensor_dev_attr_in8_input.dev_attr.attr,
 545         &sensor_dev_attr_in8_min.dev_attr.attr,
 546         &sensor_dev_attr_in8_max.dev_attr.attr,
 547         &sensor_dev_attr_in8_lcrit.dev_attr.attr,
 548         &sensor_dev_attr_in8_crit.dev_attr.attr,
 549         &sensor_dev_attr_in8_crit_alarm.dev_attr.attr,
 550
 551         &sensor_dev_attr_in9_input.dev_attr.attr,
 552         &sensor_dev_attr_in9_min.dev_attr.attr,
 553         &sensor_dev_attr_in9_max.dev_attr.attr,
 554         &sensor_dev_attr_in9_lcrit.dev_attr.attr,
 555         &sensor_dev_attr_in9_crit.dev_attr.attr,
 556         &sensor_dev_attr_in9_crit_alarm.dev_attr.attr,
 557
 558         &sensor_dev_attr_in10_input.dev_attr.attr,
 559         &sensor_dev_attr_in10_min.dev_attr.attr,
 560         &sensor_dev_attr_in10_max.dev_attr.attr,
 561         &sensor_dev_attr_in10_lcrit.dev_attr.attr,
 562         &sensor_dev_attr_in10_crit.dev_attr.attr,
 563         &sensor_dev_attr_in10_crit_alarm.dev_attr.attr,
 564
 565         &sensor_dev_attr_temp1_input.dev_attr.attr,
 566         &sensor_dev_attr_temp1_min.dev_attr.attr,
 567         &sensor_dev_attr_temp1_max.dev_attr.attr,
 568         &sensor_dev_attr_temp1_lcrit.dev_attr.attr,
 569         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 570         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 571
 572         NULL,
 573 };
 574
 575 static const struct attribute_group smm665_group = {
 576         .attrs = smm665_attributes,
 577 };
 578
 579 static int smm665_probe(struct i2c_client *client,
 580                         const struct i2c_device_id *id)
 581 {
 582         struct i2c_adapter *adapter = client->adapter;
 583         struct smm665_data *data;
 584         int i, ret;
 585
 586         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
 587                                      | I2C_FUNC_SMBUS_WORD_DATA))
 588                 return -ENODEV;
 589
 590         if (i2c_smbus_read_byte_data(client, SMM665_ADOC_ENABLE) < 0)
 591                 return -ENODEV;
 592
 593         ret = -ENOMEM;
 594         data = kzalloc(sizeof(*data), GFP_KERNEL);
 595         if (!data)
 596                 goto out_return;
 597
 598         i2c_set_clientdata(client, data);
 599         mutex_init(&data->update_lock);
 600
 601         data->type = id->driver_data;
 602         data->cmdreg = i2c_new_dummy(adapter, (client->addr & ~SMM665_REGMASK)
 603                                      | SMM665_CMDREG_BASE);
 604         if (!data->cmdreg)
 605                 goto out_kfree;
 606
 607         switch (data->type) {
 608         case smm465:
 609         case smm665:
 610                 data->conversion_time = SMM665_ADC_WAIT_SMM665;
 611                 break;
 612         case smm665c:
 613         case smm764:
 614         case smm766:
 615                 data->conversion_time = SMM665_ADC_WAIT_SMM766;
 616                 break;
 617         }
 618
 619         ret = -ENODEV;
 620         if (i2c_smbus_read_byte_data(data->cmdreg, SMM665_MISC8_CMD_STS) < 0)
 621                 goto out_unregister;
 622
 623         /*
 624          * Read limits.
 625          *
 626          * Limit registers start with register SMM665_LIMIT_BASE.
 627          * Each channel uses 8 registers, providing four limit values
 628          * per channel. Each limit value requires two registers, with the
 629          * high byte in the first register and the low byte in the second
 630          * register. The first two limits are under limit values, followed
 631          * by two over limit values.
 632          *
 633          * Limit register order matches the ADC register order, so we use
 634          * ADC register defines throughout the code to index limit registers.
 635          *
 636          * We save the first retrieved value both as "critical" and "alarm"
 637          * value. The second value overwrites either the critical or the
 638          * alarm value, depending on its configuration. This ensures that both
 639          * critical and alarm values are initialized, even if both registers are
 640          * configured as critical or non-critical.
 641          */
 642         for (i = 0; i < SMM665_NUM_ADC; i++) {
 643                 int val;
 644
 645                 val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8);
 646                 if (unlikely(val < 0))
 647                         goto out_unregister;
 648                 data->critical_min_limit[i] = data->alarm_min_limit[i]
 649                   = smm665_convert(val, i);
 650                 val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 2);
 651                 if (unlikely(val < 0))
 652                         goto out_unregister;
 653                 if (smm665_is_critical(val))
 654                         data->critical_min_limit[i] = smm665_convert(val, i);
 655                 else
 656                         data->alarm_min_limit[i] = smm665_convert(val, i);
 657                 val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 4);
 658                 if (unlikely(val < 0))
 659                         goto out_unregister;
 660                 data->critical_max_limit[i] = data->alarm_max_limit[i]
 661                   = smm665_convert(val, i);
 662                 val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 6);
 663                 if (unlikely(val < 0))
 664                         goto out_unregister;
 665                 if (smm665_is_critical(val))
 666                         data->critical_max_limit[i] = smm665_convert(val, i);
 667                 else
 668                         data->alarm_max_limit[i] = smm665_convert(val, i);
 669         }
 670
 671         /* Register sysfs hooks */
 672         ret = sysfs_create_group(&client->dev.kobj, &smm665_group);
 673         if (ret)
 674                 goto out_unregister;
 675
 676         data->hwmon_dev = hwmon_device_register(&client->dev);
 677         if (IS_ERR(data->hwmon_dev)) {
 678                 ret = PTR_ERR(data->hwmon_dev);
 679                 goto out_remove_group;
 680         }
 681
 682         return 0;
 683
 684 out_remove_group:
 685         sysfs_remove_group(&client->dev.kobj, &smm665_group);
 686 out_unregister:
 687         i2c_unregister_device(data->cmdreg);
 688 out_kfree:
 689         kfree(data);
 690 out_return:
 691         return ret;
 692 }
 693
 694 static int smm665_remove(struct i2c_client *client)
 695 {
 696         struct smm665_data *data = i2c_get_clientdata(client);
 697
 698         i2c_unregister_device(data->cmdreg);
 699         hwmon_device_unregister(data->hwmon_dev);
 700         sysfs_remove_group(&client->dev.kobj, &smm665_group);
 701
 702         kfree(data);
 703
 704         return 0;
 705 }
 706
 707 static const struct i2c_device_id smm665_id[] = {
 708         {"smm465", smm465},
 709         {"smm665", smm665},
 710         {"smm665c", smm665c},
 711         {"smm764", smm764},
 712         {"smm766", smm766},
 713         {}
 714 };
 715
 716 MODULE_DEVICE_TABLE(i2c, smm665_id);
 717
 718 /* This is the driver that will be inserted */
 719 static struct i2c_driver smm665_driver = {
 720         .driver = {
 721                    .name = "smm665",
 722                    },
 723         .probe = smm665_probe,
 724         .remove = smm665_remove,
 725         .id_table = smm665_id,
 726 };
 727
 728 static int __init smm665_init(void)
 729 {
 730         return i2c_add_driver(&smm665_driver);
 731 }
 732
 733 static void __exit smm665_exit(void)
 734 {
 735         i2c_del_driver(&smm665_driver);
 736 }
 737
 738 MODULE_AUTHOR("Guenter Roeck");
 739 MODULE_DESCRIPTION("SMM665 driver");
 740 MODULE_LICENSE("GPL");
 741
 742 module_init(smm665_init);
 743 module_exit(smm665_exit);