drivers/hwmon/max6697.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
   4  *
   5  * based on max1668.c
   6  * Copyright (c) 2011 David George <david.george@ska.ac.za>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/i2c.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/hwmon-sysfs.h>
  16 #include <linux/err.h>
  17 #include <linux/mutex.h>
  18 #include <linux/of_device.h>
  19 #include <linux/of.h>
  20
  21 #include <linux/platform_data/max6697.h>
  22
  23 enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
  24              max6697, max6698, max6699 };
  25
  26 /* Report local sensor as temp1 */
  27
  28 static const u8 MAX6697_REG_TEMP[] = {
  29                         0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
  30 static const u8 MAX6697_REG_TEMP_EXT[] = {
  31                         0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
  32 static const u8 MAX6697_REG_MAX[] = {
  33                         0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
  34 static const u8 MAX6697_REG_CRIT[] = {
  35                         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
  36
  37 /*
  38  * Map device tree / platform data register bit map to chip bit map.
  39  * Applies to alert register and over-temperature register.
  40  */
  41 #define MAX6697_MAP_BITS(reg)   ((((reg) & 0x7e) >> 1) | \
  42                                  (((reg) & 0x01) << 6) | ((reg) & 0x80))
  43
  44 #define MAX6697_REG_STAT(n)             (0x44 + (n))
  45
  46 #define MAX6697_REG_CONFIG              0x41
  47 #define MAX6581_CONF_EXTENDED           (1 << 1)
  48 #define MAX6693_CONF_BETA               (1 << 2)
  49 #define MAX6697_CONF_RESISTANCE         (1 << 3)
  50 #define MAX6697_CONF_TIMEOUT            (1 << 5)
  51 #define MAX6697_REG_ALERT_MASK          0x42
  52 #define MAX6697_REG_OVERT_MASK          0x43
  53
  54 #define MAX6581_REG_RESISTANCE          0x4a
  55 #define MAX6581_REG_IDEALITY            0x4b
  56 #define MAX6581_REG_IDEALITY_SELECT     0x4c
  57 #define MAX6581_REG_OFFSET              0x4d
  58 #define MAX6581_REG_OFFSET_SELECT       0x4e
  59
  60 #define MAX6697_CONV_TIME               156     /* ms per channel, worst case */
  61
  62 struct max6697_chip_data {
  63         int channels;
  64         u32 have_ext;
  65         u32 have_crit;
  66         u32 have_fault;
  67         u8 valid_conf;
  68         const u8 *alarm_map;
  69 };
  70
  71 struct max6697_data {
  72         struct i2c_client *client;
  73
  74         enum chips type;
  75         const struct max6697_chip_data *chip;
  76
  77         int update_interval;    /* in milli-seconds */
  78         int temp_offset;        /* in degrees C */
  79
  80         struct mutex update_lock;
  81         unsigned long last_updated;     /* In jiffies */
  82         bool valid;             /* true if following fields are valid */
  83
  84         /* 1x local and up to 7x remote */
  85         u8 temp[8][4];          /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
  86 #define MAX6697_TEMP_INPUT      0
  87 #define MAX6697_TEMP_EXT        1
  88 #define MAX6697_TEMP_MAX        2
  89 #define MAX6697_TEMP_CRIT       3
  90         u32 alarms;
  91 };
  92
  93 /* Diode fault status bits on MAX6581 are right shifted by one bit */
  94 static const u8 max6581_alarm_map[] = {
  95          0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
  96          16, 17, 18, 19, 20, 21, 22, 23 };
  97
  98 static const struct max6697_chip_data max6697_chip_data[] = {
  99         [max6581] = {
 100                 .channels = 8,
 101                 .have_crit = 0xff,
 102                 .have_ext = 0x7f,
 103                 .have_fault = 0xfe,
 104                 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
 105                 .alarm_map = max6581_alarm_map,
 106         },
 107         [max6602] = {
 108                 .channels = 5,
 109                 .have_crit = 0x12,
 110                 .have_ext = 0x02,
 111                 .have_fault = 0x1e,
 112                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 113         },
 114         [max6622] = {
 115                 .channels = 5,
 116                 .have_crit = 0x12,
 117                 .have_ext = 0x02,
 118                 .have_fault = 0x1e,
 119                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 120         },
 121         [max6636] = {
 122                 .channels = 7,
 123                 .have_crit = 0x72,
 124                 .have_ext = 0x02,
 125                 .have_fault = 0x7e,
 126                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 127         },
 128         [max6689] = {
 129                 .channels = 7,
 130                 .have_crit = 0x72,
 131                 .have_ext = 0x02,
 132                 .have_fault = 0x7e,
 133                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 134         },
 135         [max6693] = {
 136                 .channels = 7,
 137                 .have_crit = 0x72,
 138                 .have_ext = 0x02,
 139                 .have_fault = 0x7e,
 140                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 141                   MAX6697_CONF_TIMEOUT,
 142         },
 143         [max6694] = {
 144                 .channels = 5,
 145                 .have_crit = 0x12,
 146                 .have_ext = 0x02,
 147                 .have_fault = 0x1e,
 148                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 149                   MAX6697_CONF_TIMEOUT,
 150         },
 151         [max6697] = {
 152                 .channels = 7,
 153                 .have_crit = 0x72,
 154                 .have_ext = 0x02,
 155                 .have_fault = 0x7e,
 156                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 157         },
 158         [max6698] = {
 159                 .channels = 7,
 160                 .have_crit = 0x72,
 161                 .have_ext = 0x02,
 162                 .have_fault = 0x0e,
 163                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 164         },
 165         [max6699] = {
 166                 .channels = 5,
 167                 .have_crit = 0x12,
 168                 .have_ext = 0x02,
 169                 .have_fault = 0x1e,
 170                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 171         },
 172 };
 173
 174 static struct max6697_data *max6697_update_device(struct device *dev)
 175 {
 176         struct max6697_data *data = dev_get_drvdata(dev);
 177         struct i2c_client *client = data->client;
 178         struct max6697_data *ret = data;
 179         int val;
 180         int i;
 181         u32 alarms;
 182
 183         mutex_lock(&data->update_lock);
 184
 185         if (data->valid &&
 186             !time_after(jiffies, data->last_updated
 187                         + msecs_to_jiffies(data->update_interval)))
 188                 goto abort;
 189
 190         for (i = 0; i < data->chip->channels; i++) {
 191                 if (data->chip->have_ext & (1 << i)) {
 192                         val = i2c_smbus_read_byte_data(client,
 193                                                        MAX6697_REG_TEMP_EXT[i]);
 194                         if (unlikely(val < 0)) {
 195                                 ret = ERR_PTR(val);
 196                                 goto abort;
 197                         }
 198                         data->temp[i][MAX6697_TEMP_EXT] = val;
 199                 }
 200
 201                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
 202                 if (unlikely(val < 0)) {
 203                         ret = ERR_PTR(val);
 204                         goto abort;
 205                 }
 206                 data->temp[i][MAX6697_TEMP_INPUT] = val;
 207
 208                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
 209                 if (unlikely(val < 0)) {
 210                         ret = ERR_PTR(val);
 211                         goto abort;
 212                 }
 213                 data->temp[i][MAX6697_TEMP_MAX] = val;
 214
 215                 if (data->chip->have_crit & (1 << i)) {
 216                         val = i2c_smbus_read_byte_data(client,
 217                                                        MAX6697_REG_CRIT[i]);
 218                         if (unlikely(val < 0)) {
 219                                 ret = ERR_PTR(val);
 220                                 goto abort;
 221                         }
 222                         data->temp[i][MAX6697_TEMP_CRIT] = val;
 223                 }
 224         }
 225
 226         alarms = 0;
 227         for (i = 0; i < 3; i++) {
 228                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
 229                 if (unlikely(val < 0)) {
 230                         ret = ERR_PTR(val);
 231                         goto abort;
 232                 }
 233                 alarms = (alarms << 8) | val;
 234         }
 235         data->alarms = alarms;
 236         data->last_updated = jiffies;
 237         data->valid = true;
 238 abort:
 239         mutex_unlock(&data->update_lock);
 240
 241         return ret;
 242 }
 243
 244 static ssize_t temp_input_show(struct device *dev,
 245                                struct device_attribute *devattr, char *buf)
 246 {
 247         int index = to_sensor_dev_attr(devattr)->index;
 248         struct max6697_data *data = max6697_update_device(dev);
 249         int temp;
 250
 251         if (IS_ERR(data))
 252                 return PTR_ERR(data);
 253
 254         temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
 255         temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
 256
 257         return sprintf(buf, "%d\n", temp * 125);
 258 }
 259
 260 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
 261                          char *buf)
 262 {
 263         int nr = to_sensor_dev_attr_2(devattr)->nr;
 264         int index = to_sensor_dev_attr_2(devattr)->index;
 265         struct max6697_data *data = max6697_update_device(dev);
 266         int temp;
 267
 268         if (IS_ERR(data))
 269                 return PTR_ERR(data);
 270
 271         temp = data->temp[nr][index];
 272         temp -= data->temp_offset;
 273
 274         return sprintf(buf, "%d\n", temp * 1000);
 275 }
 276
 277 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 278                           char *buf)
 279 {
 280         int index = to_sensor_dev_attr(attr)->index;
 281         struct max6697_data *data = max6697_update_device(dev);
 282
 283         if (IS_ERR(data))
 284                 return PTR_ERR(data);
 285
 286         if (data->chip->alarm_map)
 287                 index = data->chip->alarm_map[index];
 288
 289         return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
 290 }
 291
 292 static ssize_t temp_store(struct device *dev,
 293                           struct device_attribute *devattr, const char *buf,
 294                           size_t count)
 295 {
 296         int nr = to_sensor_dev_attr_2(devattr)->nr;
 297         int index = to_sensor_dev_attr_2(devattr)->index;
 298         struct max6697_data *data = dev_get_drvdata(dev);
 299         long temp;
 300         int ret;
 301
 302         ret = kstrtol(buf, 10, &temp);
 303         if (ret < 0)
 304                 return ret;
 305
 306         mutex_lock(&data->update_lock);
 307         temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
 308         temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
 309         data->temp[nr][index] = temp;
 310         ret = i2c_smbus_write_byte_data(data->client,
 311                                         index == 2 ? MAX6697_REG_MAX[nr]
 312                                                    : MAX6697_REG_CRIT[nr],
 313                                         temp);
 314         mutex_unlock(&data->update_lock);
 315
 316         return ret < 0 ? ret : count;
 317 }
 318
 319 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
 320 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
 321 static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
 322
 323 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
 324 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
 325 static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
 326
 327 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
 328 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
 329 static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
 330
 331 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
 332 static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
 333 static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
 334
 335 static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
 336 static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
 337 static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
 338
 339 static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
 340 static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
 341 static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
 342
 343 static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
 344 static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
 345 static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
 346
 347 static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
 348 static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
 349 static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
 350
 351 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
 352 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
 353 static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
 354 static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
 355 static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
 356 static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
 357 static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
 358 static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
 359
 360 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
 361 static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
 362 static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
 363 static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
 364 static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
 365 static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
 366 static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
 367 static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
 368
 369 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
 370 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
 371 static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
 372 static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
 373 static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
 374 static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
 375 static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
 376
 377 static DEVICE_ATTR(dummy, 0, NULL, NULL);
 378
 379 static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
 380                                   int index)
 381 {
 382         struct device *dev = container_of(kobj, struct device, kobj);
 383         struct max6697_data *data = dev_get_drvdata(dev);
 384         const struct max6697_chip_data *chip = data->chip;
 385         int channel = index / 6;        /* channel number */
 386         int nr = index % 6;             /* attribute index within channel */
 387
 388         if (channel >= chip->channels)
 389                 return 0;
 390
 391         if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
 392                 return 0;
 393         if (nr == 5 && !(chip->have_fault & (1 << channel)))
 394                 return 0;
 395
 396         return attr->mode;
 397 }
 398
 399 /*
 400  * max6697_is_visible uses the index into the following array to determine
 401  * if attributes should be created or not. Any change in order or content
 402  * must be matched in max6697_is_visible.
 403  */
 404 static struct attribute *max6697_attributes[] = {
 405         &sensor_dev_attr_temp1_input.dev_attr.attr,
 406         &sensor_dev_attr_temp1_max.dev_attr.attr,
 407         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 408         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 409         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 410         &dev_attr_dummy.attr,
 411
 412         &sensor_dev_attr_temp2_input.dev_attr.attr,
 413         &sensor_dev_attr_temp2_max.dev_attr.attr,
 414         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 415         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 416         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 417         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 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
 426         &sensor_dev_attr_temp4_input.dev_attr.attr,
 427         &sensor_dev_attr_temp4_max.dev_attr.attr,
 428         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 429         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 430         &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 431         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 432
 433         &sensor_dev_attr_temp5_input.dev_attr.attr,
 434         &sensor_dev_attr_temp5_max.dev_attr.attr,
 435         &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 436         &sensor_dev_attr_temp5_crit.dev_attr.attr,
 437         &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
 438         &sensor_dev_attr_temp5_fault.dev_attr.attr,
 439
 440         &sensor_dev_attr_temp6_input.dev_attr.attr,
 441         &sensor_dev_attr_temp6_max.dev_attr.attr,
 442         &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
 443         &sensor_dev_attr_temp6_crit.dev_attr.attr,
 444         &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
 445         &sensor_dev_attr_temp6_fault.dev_attr.attr,
 446
 447         &sensor_dev_attr_temp7_input.dev_attr.attr,
 448         &sensor_dev_attr_temp7_max.dev_attr.attr,
 449         &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
 450         &sensor_dev_attr_temp7_crit.dev_attr.attr,
 451         &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
 452         &sensor_dev_attr_temp7_fault.dev_attr.attr,
 453
 454         &sensor_dev_attr_temp8_input.dev_attr.attr,
 455         &sensor_dev_attr_temp8_max.dev_attr.attr,
 456         &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
 457         &sensor_dev_attr_temp8_crit.dev_attr.attr,
 458         &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
 459         &sensor_dev_attr_temp8_fault.dev_attr.attr,
 460         NULL
 461 };
 462
 463 static const struct attribute_group max6697_group = {
 464         .attrs = max6697_attributes, .is_visible = max6697_is_visible,
 465 };
 466 __ATTRIBUTE_GROUPS(max6697);
 467
 468 static void max6697_get_config_of(struct device_node *node,
 469                                   struct max6697_platform_data *pdata)
 470 {
 471         int len;
 472         const __be32 *prop;
 473
 474         pdata->smbus_timeout_disable =
 475                 of_property_read_bool(node, "smbus-timeout-disable");
 476         pdata->extended_range_enable =
 477                 of_property_read_bool(node, "extended-range-enable");
 478         pdata->beta_compensation =
 479                 of_property_read_bool(node, "beta-compensation-enable");
 480
 481         prop = of_get_property(node, "alert-mask", &len);
 482         if (prop && len == sizeof(u32))
 483                 pdata->alert_mask = be32_to_cpu(prop[0]);
 484         prop = of_get_property(node, "over-temperature-mask", &len);
 485         if (prop && len == sizeof(u32))
 486                 pdata->over_temperature_mask = be32_to_cpu(prop[0]);
 487         prop = of_get_property(node, "resistance-cancellation", &len);
 488         if (prop) {
 489                 if (len == sizeof(u32))
 490                         pdata->resistance_cancellation = be32_to_cpu(prop[0]);
 491                 else
 492                         pdata->resistance_cancellation = 0xfe;
 493         }
 494         prop = of_get_property(node, "transistor-ideality", &len);
 495         if (prop && len == 2 * sizeof(u32)) {
 496                         pdata->ideality_mask = be32_to_cpu(prop[0]);
 497                         pdata->ideality_value = be32_to_cpu(prop[1]);
 498         }
 499 }
 500
 501 static int max6697_init_chip(struct max6697_data *data,
 502                              struct i2c_client *client)
 503 {
 504         struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
 505         struct max6697_platform_data p;
 506         const struct max6697_chip_data *chip = data->chip;
 507         int factor = chip->channels;
 508         int ret, reg;
 509
 510         /*
 511          * Don't touch configuration if neither platform data nor OF
 512          * configuration was specified. If that is the case, use the
 513          * current chip configuration.
 514          */
 515         if (!pdata && !client->dev.of_node) {
 516                 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
 517                 if (reg < 0)
 518                         return reg;
 519                 if (data->type == max6581) {
 520                         if (reg & MAX6581_CONF_EXTENDED)
 521                                 data->temp_offset = 64;
 522                         reg = i2c_smbus_read_byte_data(client,
 523                                                        MAX6581_REG_RESISTANCE);
 524                         if (reg < 0)
 525                                 return reg;
 526                         factor += hweight8(reg);
 527                 } else {
 528                         if (reg & MAX6697_CONF_RESISTANCE)
 529                                 factor++;
 530                 }
 531                 goto done;
 532         }
 533
 534         if (client->dev.of_node) {
 535                 memset(&p, 0, sizeof(p));
 536                 max6697_get_config_of(client->dev.of_node, &p);
 537                 pdata = &p;
 538         }
 539
 540         reg = 0;
 541         if (pdata->smbus_timeout_disable &&
 542             (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
 543                 reg |= MAX6697_CONF_TIMEOUT;
 544         }
 545         if (pdata->extended_range_enable &&
 546             (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
 547                 reg |= MAX6581_CONF_EXTENDED;
 548                 data->temp_offset = 64;
 549         }
 550         if (pdata->resistance_cancellation &&
 551             (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
 552                 reg |= MAX6697_CONF_RESISTANCE;
 553                 factor++;
 554         }
 555         if (pdata->beta_compensation &&
 556             (chip->valid_conf & MAX6693_CONF_BETA)) {
 557                 reg |= MAX6693_CONF_BETA;
 558         }
 559
 560         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
 561         if (ret < 0)
 562                 return ret;
 563
 564         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
 565                                         MAX6697_MAP_BITS(pdata->alert_mask));
 566         if (ret < 0)
 567                 return ret;
 568
 569         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
 570                                 MAX6697_MAP_BITS(pdata->over_temperature_mask));
 571         if (ret < 0)
 572                 return ret;
 573
 574         if (data->type == max6581) {
 575                 factor += hweight8(pdata->resistance_cancellation >> 1);
 576                 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
 577                                         pdata->resistance_cancellation >> 1);
 578                 if (ret < 0)
 579                         return ret;
 580                 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
 581                                                 pdata->ideality_value);
 582                 if (ret < 0)
 583                         return ret;
 584                 ret = i2c_smbus_write_byte_data(client,
 585                                                 MAX6581_REG_IDEALITY_SELECT,
 586                                                 pdata->ideality_mask >> 1);
 587                 if (ret < 0)
 588                         return ret;
 589         }
 590 done:
 591         data->update_interval = factor * MAX6697_CONV_TIME;
 592         return 0;
 593 }
 594
 595 static int max6697_probe(struct i2c_client *client,
 596                          const struct i2c_device_id *id)
 597 {
 598         struct i2c_adapter *adapter = client->adapter;
 599         struct device *dev = &client->dev;
 600         struct max6697_data *data;
 601         struct device *hwmon_dev;
 602         int err;
 603
 604         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 605                 return -ENODEV;
 606
 607         data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
 608         if (!data)
 609                 return -ENOMEM;
 610
 611         if (client->dev.of_node)
 612                 data->type = (enum chips)of_device_get_match_data(&client->dev);
 613         else
 614                 data->type = id->driver_data;
 615         data->chip = &max6697_chip_data[data->type];
 616         data->client = client;
 617         mutex_init(&data->update_lock);
 618
 619         err = max6697_init_chip(data, client);
 620         if (err)
 621                 return err;
 622
 623         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 624                                                            data,
 625                                                            max6697_groups);
 626         return PTR_ERR_OR_ZERO(hwmon_dev);
 627 }
 628
 629 static const struct i2c_device_id max6697_id[] = {
 630         { "max6581", max6581 },
 631         { "max6602", max6602 },
 632         { "max6622", max6622 },
 633         { "max6636", max6636 },
 634         { "max6689", max6689 },
 635         { "max6693", max6693 },
 636         { "max6694", max6694 },
 637         { "max6697", max6697 },
 638         { "max6698", max6698 },
 639         { "max6699", max6699 },
 640         { }
 641 };
 642 MODULE_DEVICE_TABLE(i2c, max6697_id);
 643
 644 static const struct of_device_id __maybe_unused max6697_of_match[] = {
 645         {
 646                 .compatible = "maxim,max6581",
 647                 .data = (void *)max6581
 648         },
 649         {
 650                 .compatible = "maxim,max6602",
 651                 .data = (void *)max6602
 652         },
 653         {
 654                 .compatible = "maxim,max6622",
 655                 .data = (void *)max6622
 656         },
 657         {
 658                 .compatible = "maxim,max6636",
 659                 .data = (void *)max6636
 660         },
 661         {
 662                 .compatible = "maxim,max6689",
 663                 .data = (void *)max6689
 664         },
 665         {
 666                 .compatible = "maxim,max6693",
 667                 .data = (void *)max6693
 668         },
 669         {
 670                 .compatible = "maxim,max6694",
 671                 .data = (void *)max6694
 672         },
 673         {
 674                 .compatible = "maxim,max6697",
 675                 .data = (void *)max6697
 676         },
 677         {
 678                 .compatible = "maxim,max6698",
 679                 .data = (void *)max6698
 680         },
 681         {
 682                 .compatible = "maxim,max6699",
 683                 .data = (void *)max6699
 684         },
 685         { },
 686 };
 687 MODULE_DEVICE_TABLE(of, max6697_of_match);
 688
 689 static struct i2c_driver max6697_driver = {
 690         .class = I2C_CLASS_HWMON,
 691         .driver = {
 692                 .name   = "max6697",
 693                 .of_match_table = of_match_ptr(max6697_of_match),
 694         },
 695         .probe = max6697_probe,
 696         .id_table = max6697_id,
 697 };
 698
 699 module_i2c_driver(max6697_driver);
 700
 701 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 702 MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
 703 MODULE_LICENSE("GPL");