drivers/hwmon/max6697.c

   1 /*
   2  * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
   3  *
   4  * based on max1668.c
   5  * Copyright (c) 2011 David George <david.george@ska.ac.za>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/slab.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/i2c.h>
  23 #include <linux/hwmon.h>
  24 #include <linux/hwmon-sysfs.h>
  25 #include <linux/err.h>
  26 #include <linux/mutex.h>
  27 #include <linux/of.h>
  28
  29 #include <linux/platform_data/max6697.h>
  30
  31 enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
  32              max6697, max6698, max6699 };
  33
  34 /* Report local sensor as temp1 */
  35
  36 static const u8 MAX6697_REG_TEMP[] = {
  37                         0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
  38 static const u8 MAX6697_REG_TEMP_EXT[] = {
  39                         0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
  40 static const u8 MAX6697_REG_MAX[] = {
  41                         0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
  42 static const u8 MAX6697_REG_CRIT[] = {
  43                         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
  44
  45 /*
  46  * Map device tree / platform data register bit map to chip bit map.
  47  * Applies to alert register and over-temperature register.
  48  */
  49 #define MAX6697_MAP_BITS(reg)   ((((reg) & 0x7e) >> 1) | \
  50                                  (((reg) & 0x01) << 6) | ((reg) & 0x80))
  51
  52 #define MAX6697_REG_STAT(n)             (0x44 + (n))
  53
  54 #define MAX6697_REG_CONFIG              0x41
  55 #define MAX6581_CONF_EXTENDED           (1 << 1)
  56 #define MAX6693_CONF_BETA               (1 << 2)
  57 #define MAX6697_CONF_RESISTANCE         (1 << 3)
  58 #define MAX6697_CONF_TIMEOUT            (1 << 5)
  59 #define MAX6697_REG_ALERT_MASK          0x42
  60 #define MAX6697_REG_OVERT_MASK          0x43
  61
  62 #define MAX6581_REG_RESISTANCE          0x4a
  63 #define MAX6581_REG_IDEALITY            0x4b
  64 #define MAX6581_REG_IDEALITY_SELECT     0x4c
  65 #define MAX6581_REG_OFFSET              0x4d
  66 #define MAX6581_REG_OFFSET_SELECT       0x4e
  67
  68 #define MAX6697_CONV_TIME               156     /* ms per channel, worst case */
  69
  70 struct max6697_chip_data {
  71         int channels;
  72         u32 have_ext;
  73         u32 have_crit;
  74         u32 have_fault;
  75         u8 valid_conf;
  76         const u8 *alarm_map;
  77 };
  78
  79 struct max6697_data {
  80         struct device *hwmon_dev;
  81
  82         enum chips type;
  83         const struct max6697_chip_data *chip;
  84
  85         int update_interval;    /* in milli-seconds */
  86         int temp_offset;        /* in degrees C */
  87
  88         struct mutex update_lock;
  89         unsigned long last_updated;     /* In jiffies */
  90         bool valid;             /* true if following fields are valid */
  91
  92         /* 1x local and up to 7x remote */
  93         u8 temp[8][4];          /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
  94 #define MAX6697_TEMP_INPUT      0
  95 #define MAX6697_TEMP_EXT        1
  96 #define MAX6697_TEMP_MAX        2
  97 #define MAX6697_TEMP_CRIT       3
  98         u32 alarms;
  99 };
 100
 101 /* Diode fault status bits on MAX6581 are right shifted by one bit */
 102 static const u8 max6581_alarm_map[] = {
 103          0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
 104          16, 17, 18, 19, 20, 21, 22, 23 };
 105
 106 static const struct max6697_chip_data max6697_chip_data[] = {
 107         [max6581] = {
 108                 .channels = 8,
 109                 .have_crit = 0xff,
 110                 .have_ext = 0x7f,
 111                 .have_fault = 0xfe,
 112                 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
 113                 .alarm_map = max6581_alarm_map,
 114         },
 115         [max6602] = {
 116                 .channels = 5,
 117                 .have_crit = 0x12,
 118                 .have_ext = 0x02,
 119                 .have_fault = 0x1e,
 120                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 121         },
 122         [max6622] = {
 123                 .channels = 5,
 124                 .have_crit = 0x12,
 125                 .have_ext = 0x02,
 126                 .have_fault = 0x1e,
 127                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 128         },
 129         [max6636] = {
 130                 .channels = 7,
 131                 .have_crit = 0x72,
 132                 .have_ext = 0x02,
 133                 .have_fault = 0x7e,
 134                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 135         },
 136         [max6689] = {
 137                 .channels = 7,
 138                 .have_crit = 0x72,
 139                 .have_ext = 0x02,
 140                 .have_fault = 0x7e,
 141                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 142         },
 143         [max6693] = {
 144                 .channels = 7,
 145                 .have_crit = 0x72,
 146                 .have_ext = 0x02,
 147                 .have_fault = 0x7e,
 148                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 149                   MAX6697_CONF_TIMEOUT,
 150         },
 151         [max6694] = {
 152                 .channels = 5,
 153                 .have_crit = 0x12,
 154                 .have_ext = 0x02,
 155                 .have_fault = 0x1e,
 156                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 157                   MAX6697_CONF_TIMEOUT,
 158         },
 159         [max6697] = {
 160                 .channels = 7,
 161                 .have_crit = 0x72,
 162                 .have_ext = 0x02,
 163                 .have_fault = 0x7e,
 164                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 165         },
 166         [max6698] = {
 167                 .channels = 7,
 168                 .have_crit = 0x72,
 169                 .have_ext = 0x02,
 170                 .have_fault = 0x0e,
 171                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 172         },
 173         [max6699] = {
 174                 .channels = 5,
 175                 .have_crit = 0x12,
 176                 .have_ext = 0x02,
 177                 .have_fault = 0x1e,
 178                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 179         },
 180 };
 181
 182 static struct max6697_data *max6697_update_device(struct device *dev)
 183 {
 184         struct i2c_client *client = to_i2c_client(dev);
 185         struct max6697_data *data = i2c_get_clientdata(client);
 186         struct max6697_data *ret = data;
 187         int val;
 188         int i;
 189         u32 alarms;
 190
 191         mutex_lock(&data->update_lock);
 192
 193         if (data->valid &&
 194             !time_after(jiffies, data->last_updated
 195                         + msecs_to_jiffies(data->update_interval)))
 196                 goto abort;
 197
 198         for (i = 0; i < data->chip->channels; i++) {
 199                 if (data->chip->have_ext & (1 << i)) {
 200                         val = i2c_smbus_read_byte_data(client,
 201                                                        MAX6697_REG_TEMP_EXT[i]);
 202                         if (unlikely(val < 0)) {
 203                                 ret = ERR_PTR(val);
 204                                 goto abort;
 205                         }
 206                         data->temp[i][MAX6697_TEMP_EXT] = val;
 207                 }
 208
 209                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
 210                 if (unlikely(val < 0)) {
 211                         ret = ERR_PTR(val);
 212                         goto abort;
 213                 }
 214                 data->temp[i][MAX6697_TEMP_INPUT] = val;
 215
 216                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
 217                 if (unlikely(val < 0)) {
 218                         ret = ERR_PTR(val);
 219                         goto abort;
 220                 }
 221                 data->temp[i][MAX6697_TEMP_MAX] = val;
 222
 223                 if (data->chip->have_crit & (1 << i)) {
 224                         val = i2c_smbus_read_byte_data(client,
 225                                                        MAX6697_REG_CRIT[i]);
 226                         if (unlikely(val < 0)) {
 227                                 ret = ERR_PTR(val);
 228                                 goto abort;
 229                         }
 230                         data->temp[i][MAX6697_TEMP_CRIT] = val;
 231                 }
 232         }
 233
 234         alarms = 0;
 235         for (i = 0; i < 3; i++) {
 236                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
 237                 if (unlikely(val < 0)) {
 238                         ret = ERR_PTR(val);
 239                         goto abort;
 240                 }
 241                 alarms = (alarms << 8) | val;
 242         }
 243         data->alarms = alarms;
 244         data->last_updated = jiffies;
 245         data->valid = true;
 246 abort:
 247         mutex_unlock(&data->update_lock);
 248
 249         return ret;
 250 }
 251
 252 static ssize_t show_temp_input(struct device *dev,
 253                                struct device_attribute *devattr, char *buf)
 254 {
 255         int index = to_sensor_dev_attr(devattr)->index;
 256         struct max6697_data *data = max6697_update_device(dev);
 257         int temp;
 258
 259         if (IS_ERR(data))
 260                 return PTR_ERR(data);
 261
 262         temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
 263         temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
 264
 265         return sprintf(buf, "%d\n", temp * 125);
 266 }
 267
 268 static ssize_t show_temp(struct device *dev,
 269                          struct device_attribute *devattr, char *buf)
 270 {
 271         int nr = to_sensor_dev_attr_2(devattr)->nr;
 272         int index = to_sensor_dev_attr_2(devattr)->index;
 273         struct max6697_data *data = max6697_update_device(dev);
 274         int temp;
 275
 276         if (IS_ERR(data))
 277                 return PTR_ERR(data);
 278
 279         temp = data->temp[nr][index];
 280         temp -= data->temp_offset;
 281
 282         return sprintf(buf, "%d\n", temp * 1000);
 283 }
 284
 285 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 286                           char *buf)
 287 {
 288         int index = to_sensor_dev_attr(attr)->index;
 289         struct max6697_data *data = max6697_update_device(dev);
 290
 291         if (IS_ERR(data))
 292                 return PTR_ERR(data);
 293
 294         if (data->chip->alarm_map)
 295                 index = data->chip->alarm_map[index];
 296
 297         return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
 298 }
 299
 300 static ssize_t set_temp(struct device *dev,
 301                         struct device_attribute *devattr,
 302                         const char *buf, size_t count)
 303 {
 304         int nr = to_sensor_dev_attr_2(devattr)->nr;
 305         int index = to_sensor_dev_attr_2(devattr)->index;
 306         struct i2c_client *client = to_i2c_client(dev);
 307         struct max6697_data *data = i2c_get_clientdata(client);
 308         long temp;
 309         int ret;
 310
 311         ret = kstrtol(buf, 10, &temp);
 312         if (ret < 0)
 313                 return ret;
 314
 315         mutex_lock(&data->update_lock);
 316         temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
 317         temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
 318         data->temp[nr][index] = temp;
 319         ret = i2c_smbus_write_byte_data(client,
 320                                         index == 2 ? MAX6697_REG_MAX[nr]
 321                                                    : MAX6697_REG_CRIT[nr],
 322                                         temp);
 323         mutex_unlock(&data->update_lock);
 324
 325         return ret < 0 ? ret : count;
 326 }
 327
 328 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
 329 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 330                             0, MAX6697_TEMP_MAX);
 331 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 332                             0, MAX6697_TEMP_CRIT);
 333
 334 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
 335 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 336                             1, MAX6697_TEMP_MAX);
 337 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 338                             1, MAX6697_TEMP_CRIT);
 339
 340 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
 341 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 342                             2, MAX6697_TEMP_MAX);
 343 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 344                             2, MAX6697_TEMP_CRIT);
 345
 346 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
 347 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 348                             3, MAX6697_TEMP_MAX);
 349 static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 350                             3, MAX6697_TEMP_CRIT);
 351
 352 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
 353 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 354                             4, MAX6697_TEMP_MAX);
 355 static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 356                             4, MAX6697_TEMP_CRIT);
 357
 358 static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);
 359 static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 360                             5, MAX6697_TEMP_MAX);
 361 static SENSOR_DEVICE_ATTR_2(temp6_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 362                             5, MAX6697_TEMP_CRIT);
 363
 364 static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp_input, NULL, 6);
 365 static SENSOR_DEVICE_ATTR_2(temp7_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 366                             6, MAX6697_TEMP_MAX);
 367 static SENSOR_DEVICE_ATTR_2(temp7_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 368                             6, MAX6697_TEMP_CRIT);
 369
 370 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp_input, NULL, 7);
 371 static SENSOR_DEVICE_ATTR_2(temp8_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 372                             7, MAX6697_TEMP_MAX);
 373 static SENSOR_DEVICE_ATTR_2(temp8_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 374                             7, MAX6697_TEMP_CRIT);
 375
 376 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 22);
 377 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 16);
 378 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 17);
 379 static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 18);
 380 static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 19);
 381 static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO, show_alarm, NULL, 20);
 382 static SENSOR_DEVICE_ATTR(temp7_max_alarm, S_IRUGO, show_alarm, NULL, 21);
 383 static SENSOR_DEVICE_ATTR(temp8_max_alarm, S_IRUGO, show_alarm, NULL, 23);
 384
 385 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 14);
 386 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
 387 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
 388 static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 10);
 389 static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 11);
 390 static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO, show_alarm, NULL, 12);
 391 static SENSOR_DEVICE_ATTR(temp7_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
 392 static SENSOR_DEVICE_ATTR(temp8_crit_alarm, S_IRUGO, show_alarm, NULL, 15);
 393
 394 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 1);
 395 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
 396 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 3);
 397 static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 4);
 398 static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_alarm, NULL, 5);
 399 static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_alarm, NULL, 6);
 400 static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_alarm, NULL, 7);
 401
 402 static struct attribute *max6697_attributes[8][7] = {
 403         {
 404                 &sensor_dev_attr_temp1_input.dev_attr.attr,
 405                 &sensor_dev_attr_temp1_max.dev_attr.attr,
 406                 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 407                 &sensor_dev_attr_temp1_crit.dev_attr.attr,
 408                 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 409                 NULL
 410         }, {
 411                 &sensor_dev_attr_temp2_input.dev_attr.attr,
 412                 &sensor_dev_attr_temp2_max.dev_attr.attr,
 413                 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 414                 &sensor_dev_attr_temp2_crit.dev_attr.attr,
 415                 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 416                 &sensor_dev_attr_temp2_fault.dev_attr.attr,
 417                 NULL
 418         }, {
 419                 &sensor_dev_attr_temp3_input.dev_attr.attr,
 420                 &sensor_dev_attr_temp3_max.dev_attr.attr,
 421                 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 422                 &sensor_dev_attr_temp3_crit.dev_attr.attr,
 423                 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 424                 &sensor_dev_attr_temp3_fault.dev_attr.attr,
 425                 NULL
 426         }, {
 427                 &sensor_dev_attr_temp4_input.dev_attr.attr,
 428                 &sensor_dev_attr_temp4_max.dev_attr.attr,
 429                 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 430                 &sensor_dev_attr_temp4_crit.dev_attr.attr,
 431                 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 432                 &sensor_dev_attr_temp4_fault.dev_attr.attr,
 433                 NULL
 434         }, {
 435                 &sensor_dev_attr_temp5_input.dev_attr.attr,
 436                 &sensor_dev_attr_temp5_max.dev_attr.attr,
 437                 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 438                 &sensor_dev_attr_temp5_crit.dev_attr.attr,
 439                 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
 440                 &sensor_dev_attr_temp5_fault.dev_attr.attr,
 441                 NULL
 442         }, {
 443                 &sensor_dev_attr_temp6_input.dev_attr.attr,
 444                 &sensor_dev_attr_temp6_max.dev_attr.attr,
 445                 &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
 446                 &sensor_dev_attr_temp6_crit.dev_attr.attr,
 447                 &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
 448                 &sensor_dev_attr_temp6_fault.dev_attr.attr,
 449                 NULL
 450         }, {
 451                 &sensor_dev_attr_temp7_input.dev_attr.attr,
 452                 &sensor_dev_attr_temp7_max.dev_attr.attr,
 453                 &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
 454                 &sensor_dev_attr_temp7_crit.dev_attr.attr,
 455                 &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
 456                 &sensor_dev_attr_temp7_fault.dev_attr.attr,
 457                 NULL
 458         }, {
 459                 &sensor_dev_attr_temp8_input.dev_attr.attr,
 460                 &sensor_dev_attr_temp8_max.dev_attr.attr,
 461                 &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
 462                 &sensor_dev_attr_temp8_crit.dev_attr.attr,
 463                 &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
 464                 &sensor_dev_attr_temp8_fault.dev_attr.attr,
 465                 NULL
 466         }
 467 };
 468
 469 static const struct attribute_group max6697_group[8] = {
 470         { .attrs = max6697_attributes[0] },
 471         { .attrs = max6697_attributes[1] },
 472         { .attrs = max6697_attributes[2] },
 473         { .attrs = max6697_attributes[3] },
 474         { .attrs = max6697_attributes[4] },
 475         { .attrs = max6697_attributes[5] },
 476         { .attrs = max6697_attributes[6] },
 477         { .attrs = max6697_attributes[7] },
 478 };
 479
 480 static void max6697_get_config_of(struct device_node *node,
 481                                   struct max6697_platform_data *pdata)
 482 {
 483         int len;
 484         const __be32 *prop;
 485
 486         prop = of_get_property(node, "smbus-timeout-disable", &len);
 487         if (prop)
 488                 pdata->smbus_timeout_disable = true;
 489         prop = of_get_property(node, "extended-range-enable", &len);
 490         if (prop)
 491                 pdata->extended_range_enable = true;
 492         prop = of_get_property(node, "beta-compensation-enable", &len);
 493         if (prop)
 494                 pdata->beta_compensation = true;
 495         prop = of_get_property(node, "alert-mask", &len);
 496         if (prop && len == sizeof(u32))
 497                 pdata->alert_mask = be32_to_cpu(prop[0]);
 498         prop = of_get_property(node, "over-temperature-mask", &len);
 499         if (prop && len == sizeof(u32))
 500                 pdata->over_temperature_mask = be32_to_cpu(prop[0]);
 501         prop = of_get_property(node, "resistance-cancellation", &len);
 502         if (prop) {
 503                 if (len == sizeof(u32))
 504                         pdata->resistance_cancellation = be32_to_cpu(prop[0]);
 505                 else
 506                         pdata->resistance_cancellation = 0xfe;
 507         }
 508         prop = of_get_property(node, "transistor-ideality", &len);
 509         if (prop && len == 2 * sizeof(u32)) {
 510                         pdata->ideality_mask = be32_to_cpu(prop[0]);
 511                         pdata->ideality_value = be32_to_cpu(prop[1]);
 512         }
 513 }
 514
 515 static int max6697_init_chip(struct i2c_client *client)
 516 {
 517         struct max6697_data *data = i2c_get_clientdata(client);
 518         struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
 519         struct max6697_platform_data p;
 520         const struct max6697_chip_data *chip = data->chip;
 521         int factor = chip->channels;
 522         int ret, reg;
 523
 524         /*
 525          * Don't touch configuration if neither platform data nor OF
 526          * configuration was specified. If that is the case, use the
 527          * current chip configuration.
 528          */
 529         if (!pdata && !client->dev.of_node) {
 530                 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
 531                 if (reg < 0)
 532                         return reg;
 533                 if (data->type == max6581) {
 534                         if (reg & MAX6581_CONF_EXTENDED)
 535                                 data->temp_offset = 64;
 536                         reg = i2c_smbus_read_byte_data(client,
 537                                                        MAX6581_REG_RESISTANCE);
 538                         if (reg < 0)
 539                                 return reg;
 540                         factor += hweight8(reg);
 541                 } else {
 542                         if (reg & MAX6697_CONF_RESISTANCE)
 543                                 factor++;
 544                 }
 545                 goto done;
 546         }
 547
 548         if (client->dev.of_node) {
 549                 memset(&p, 0, sizeof(p));
 550                 max6697_get_config_of(client->dev.of_node, &p);
 551                 pdata = &p;
 552         }
 553
 554         reg = 0;
 555         if (pdata->smbus_timeout_disable &&
 556             (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
 557                 reg |= MAX6697_CONF_TIMEOUT;
 558         }
 559         if (pdata->extended_range_enable &&
 560             (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
 561                 reg |= MAX6581_CONF_EXTENDED;
 562                 data->temp_offset = 64;
 563         }
 564         if (pdata->resistance_cancellation &&
 565             (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
 566                 reg |= MAX6697_CONF_RESISTANCE;
 567                 factor++;
 568         }
 569         if (pdata->beta_compensation &&
 570             (chip->valid_conf & MAX6693_CONF_BETA)) {
 571                 reg |= MAX6693_CONF_BETA;
 572         }
 573
 574         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
 575         if (ret < 0)
 576                 return ret;
 577
 578         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
 579                                         MAX6697_MAP_BITS(pdata->alert_mask));
 580         if (ret < 0)
 581                 return ret;
 582
 583         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
 584                                 MAX6697_MAP_BITS(pdata->over_temperature_mask));
 585         if (ret < 0)
 586                 return ret;
 587
 588         if (data->type == max6581) {
 589                 factor += hweight8(pdata->resistance_cancellation >> 1);
 590                 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
 591                                         pdata->resistance_cancellation >> 1);
 592                 if (ret < 0)
 593                         return ret;
 594                 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
 595                                                 pdata->ideality_mask >> 1);
 596                 if (ret < 0)
 597                         return ret;
 598                 ret = i2c_smbus_write_byte_data(client,
 599                                                 MAX6581_REG_IDEALITY_SELECT,
 600                                                 pdata->ideality_value);
 601                 if (ret < 0)
 602                         return ret;
 603         }
 604 done:
 605         data->update_interval = factor * MAX6697_CONV_TIME;
 606         return 0;
 607 }
 608
 609 static void max6697_remove_files(struct i2c_client *client)
 610 {
 611         int i;
 612
 613         for (i = 0; i < ARRAY_SIZE(max6697_group); i++)
 614                 sysfs_remove_group(&client->dev.kobj, &max6697_group[i]);
 615 }
 616
 617 static int max6697_probe(struct i2c_client *client,
 618                          const struct i2c_device_id *id)
 619 {
 620         struct i2c_adapter *adapter = client->adapter;
 621         struct device *dev = &client->dev;
 622         struct max6697_data *data;
 623         int i, err;
 624
 625         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 626                 return -ENODEV;
 627
 628         data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
 629         if (!data)
 630                 return -ENOMEM;
 631
 632         data->type = id->driver_data;
 633         data->chip = &max6697_chip_data[data->type];
 634
 635         i2c_set_clientdata(client, data);
 636         mutex_init(&data->update_lock);
 637
 638         err = max6697_init_chip(client);
 639         if (err)
 640                 return err;
 641
 642         for (i = 0; i < data->chip->channels; i++) {
 643                 err = sysfs_create_file(&dev->kobj,
 644                                         max6697_attributes[i][0]);
 645                 if (err)
 646                         goto error;
 647                 err = sysfs_create_file(&dev->kobj,
 648                                         max6697_attributes[i][1]);
 649                 if (err)
 650                         goto error;
 651                 err = sysfs_create_file(&dev->kobj,
 652                                         max6697_attributes[i][2]);
 653                 if (err)
 654                         goto error;
 655
 656                 if (data->chip->have_crit & (1 << i)) {
 657                         err = sysfs_create_file(&dev->kobj,
 658                                                 max6697_attributes[i][3]);
 659                         if (err)
 660                                 goto error;
 661                         err = sysfs_create_file(&dev->kobj,
 662                                                 max6697_attributes[i][4]);
 663                         if (err)
 664                                 goto error;
 665                 }
 666                 if (data->chip->have_fault & (1 << i)) {
 667                         err = sysfs_create_file(&dev->kobj,
 668                                                 max6697_attributes[i][5]);
 669                         if (err)
 670                                 goto error;
 671                 }
 672         }
 673
 674         data->hwmon_dev = hwmon_device_register(dev);
 675         if (IS_ERR(data->hwmon_dev)) {
 676                 err = PTR_ERR(data->hwmon_dev);
 677                 goto error;
 678         }
 679
 680         return 0;
 681
 682 error:
 683         max6697_remove_files(client);
 684         return err;
 685 }
 686
 687 static int max6697_remove(struct i2c_client *client)
 688 {
 689         struct max6697_data *data = i2c_get_clientdata(client);
 690
 691         hwmon_device_unregister(data->hwmon_dev);
 692         max6697_remove_files(client);
 693
 694         return 0;
 695 }
 696
 697 static const struct i2c_device_id max6697_id[] = {
 698         { "max6581", max6581 },
 699         { "max6602", max6602 },
 700         { "max6622", max6622 },
 701         { "max6636", max6636 },
 702         { "max6689", max6689 },
 703         { "max6693", max6693 },
 704         { "max6694", max6694 },
 705         { "max6697", max6697 },
 706         { "max6698", max6698 },
 707         { "max6699", max6699 },
 708         { }
 709 };
 710 MODULE_DEVICE_TABLE(i2c, max6697_id);
 711
 712 static struct i2c_driver max6697_driver = {
 713         .class = I2C_CLASS_HWMON,
 714         .driver = {
 715                 .name   = "max6697",
 716         },
 717         .probe = max6697_probe,
 718         .remove = max6697_remove,
 719         .id_table = max6697_id,
 720 };
 721
 722 module_i2c_driver(max6697_driver);
 723
 724 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 725 MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
 726 MODULE_LICENSE("GPL");