linux/drivers/hwmon/max6697.c
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   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
  23enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
  24             max6697, max6698, max6699 };
  25
  26/* Report local sensor as temp1 */
  27
  28static const u8 MAX6697_REG_TEMP[] = {
  29                        0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
  30static const u8 MAX6697_REG_TEMP_EXT[] = {
  31                        0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
  32static const u8 MAX6697_REG_MAX[] = {
  33                        0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
  34static 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_ALERT_MAP_BITS(reg)     ((((reg) & 0x7e) >> 1) | \
  42                                 (((reg) & 0x01) << 6) | ((reg) & 0x80))
  43#define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7))
  44
  45#define MAX6697_REG_STAT(n)             (0x44 + (n))
  46
  47#define MAX6697_REG_CONFIG              0x41
  48#define MAX6581_CONF_EXTENDED           (1 << 1)
  49#define MAX6693_CONF_BETA               (1 << 2)
  50#define MAX6697_CONF_RESISTANCE         (1 << 3)
  51#define MAX6697_CONF_TIMEOUT            (1 << 5)
  52#define MAX6697_REG_ALERT_MASK          0x42
  53#define MAX6697_REG_OVERT_MASK          0x43
  54
  55#define MAX6581_REG_RESISTANCE          0x4a
  56#define MAX6581_REG_IDEALITY            0x4b
  57#define MAX6581_REG_IDEALITY_SELECT     0x4c
  58#define MAX6581_REG_OFFSET              0x4d
  59#define MAX6581_REG_OFFSET_SELECT       0x4e
  60#define MAX6581_OFFSET_MIN              -31750
  61#define MAX6581_OFFSET_MAX              31750
  62
  63#define MAX6697_CONV_TIME               156     /* ms per channel, worst case */
  64
  65struct max6697_chip_data {
  66        int channels;
  67        u32 have_ext;
  68        u32 have_crit;
  69        u32 have_fault;
  70        u8 valid_conf;
  71        const u8 *alarm_map;
  72};
  73
  74struct max6697_data {
  75        struct i2c_client *client;
  76
  77        enum chips type;
  78        const struct max6697_chip_data *chip;
  79
  80        int update_interval;    /* in milli-seconds */
  81        int temp_offset;        /* in degrees C */
  82
  83        struct mutex update_lock;
  84        unsigned long last_updated;     /* In jiffies */
  85        bool valid;             /* true if following fields are valid */
  86
  87        /* 1x local and up to 7x remote */
  88        u8 temp[8][4];          /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
  89#define MAX6697_TEMP_INPUT      0
  90#define MAX6697_TEMP_EXT        1
  91#define MAX6697_TEMP_MAX        2
  92#define MAX6697_TEMP_CRIT       3
  93        u32 alarms;
  94};
  95
  96/* Diode fault status bits on MAX6581 are right shifted by one bit */
  97static const u8 max6581_alarm_map[] = {
  98         0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
  99         16, 17, 18, 19, 20, 21, 22, 23 };
 100
 101static const struct max6697_chip_data max6697_chip_data[] = {
 102        [max6581] = {
 103                .channels = 8,
 104                .have_crit = 0xff,
 105                .have_ext = 0x7f,
 106                .have_fault = 0xfe,
 107                .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
 108                .alarm_map = max6581_alarm_map,
 109        },
 110        [max6602] = {
 111                .channels = 5,
 112                .have_crit = 0x12,
 113                .have_ext = 0x02,
 114                .have_fault = 0x1e,
 115                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 116        },
 117        [max6622] = {
 118                .channels = 5,
 119                .have_crit = 0x12,
 120                .have_ext = 0x02,
 121                .have_fault = 0x1e,
 122                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 123        },
 124        [max6636] = {
 125                .channels = 7,
 126                .have_crit = 0x72,
 127                .have_ext = 0x02,
 128                .have_fault = 0x7e,
 129                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 130        },
 131        [max6689] = {
 132                .channels = 7,
 133                .have_crit = 0x72,
 134                .have_ext = 0x02,
 135                .have_fault = 0x7e,
 136                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 137        },
 138        [max6693] = {
 139                .channels = 7,
 140                .have_crit = 0x72,
 141                .have_ext = 0x02,
 142                .have_fault = 0x7e,
 143                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 144                  MAX6697_CONF_TIMEOUT,
 145        },
 146        [max6694] = {
 147                .channels = 5,
 148                .have_crit = 0x12,
 149                .have_ext = 0x02,
 150                .have_fault = 0x1e,
 151                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 152                  MAX6697_CONF_TIMEOUT,
 153        },
 154        [max6697] = {
 155                .channels = 7,
 156                .have_crit = 0x72,
 157                .have_ext = 0x02,
 158                .have_fault = 0x7e,
 159                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 160        },
 161        [max6698] = {
 162                .channels = 7,
 163                .have_crit = 0x72,
 164                .have_ext = 0x02,
 165                .have_fault = 0x0e,
 166                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 167        },
 168        [max6699] = {
 169                .channels = 5,
 170                .have_crit = 0x12,
 171                .have_ext = 0x02,
 172                .have_fault = 0x1e,
 173                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 174        },
 175};
 176
 177static inline int max6581_offset_to_millic(int val)
 178{
 179        return sign_extend32(val, 7) * 250;
 180}
 181
 182static struct max6697_data *max6697_update_device(struct device *dev)
 183{
 184        struct max6697_data *data = dev_get_drvdata(dev);
 185        struct i2c_client *client = data->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;
 246abort:
 247        mutex_unlock(&data->update_lock);
 248
 249        return ret;
 250}
 251
 252static ssize_t temp_input_show(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
 268static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
 269                         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
 285static ssize_t alarm_show(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
 300static ssize_t temp_store(struct device *dev,
 301                          struct device_attribute *devattr, const char *buf,
 302                          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 max6697_data *data = dev_get_drvdata(dev);
 307        long temp;
 308        int ret;
 309
 310        ret = kstrtol(buf, 10, &temp);
 311        if (ret < 0)
 312                return ret;
 313
 314        mutex_lock(&data->update_lock);
 315        temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
 316        temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
 317        data->temp[nr][index] = temp;
 318        ret = i2c_smbus_write_byte_data(data->client,
 319                                        index == 2 ? MAX6697_REG_MAX[nr]
 320                                                   : MAX6697_REG_CRIT[nr],
 321                                        temp);
 322        mutex_unlock(&data->update_lock);
 323
 324        return ret < 0 ? ret : count;
 325}
 326
 327static ssize_t offset_store(struct device *dev, struct device_attribute *devattr, const char *buf,
 328                            size_t count)
 329{
 330        int val, ret, index, select;
 331        struct max6697_data *data;
 332        bool channel_enabled;
 333        long temp;
 334
 335        index = to_sensor_dev_attr(devattr)->index;
 336        data = dev_get_drvdata(dev);
 337        ret = kstrtol(buf, 10, &temp);
 338        if (ret < 0)
 339                return ret;
 340
 341        mutex_lock(&data->update_lock);
 342        select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
 343        if (select < 0) {
 344                ret = select;
 345                goto abort;
 346        }
 347        channel_enabled = (select & (1 << (index - 1)));
 348        temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
 349        val = DIV_ROUND_CLOSEST(temp, 250);
 350        /* disable the offset for channel if the new offset is 0 */
 351        if (val == 0) {
 352                if (channel_enabled)
 353                        ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
 354                                                        select & ~(1 << (index - 1)));
 355                ret = ret < 0 ? ret : count;
 356                goto abort;
 357        }
 358        if (!channel_enabled) {
 359                ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
 360                                                select | (1 << (index - 1)));
 361                if (ret < 0)
 362                        goto abort;
 363        }
 364        ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET, val);
 365        ret = ret < 0 ? ret : count;
 366
 367abort:
 368        mutex_unlock(&data->update_lock);
 369        return ret;
 370}
 371
 372static ssize_t offset_show(struct device *dev, struct device_attribute *devattr, char *buf)
 373{
 374        struct max6697_data *data;
 375        int select, ret, index;
 376
 377        index = to_sensor_dev_attr(devattr)->index;
 378        data = dev_get_drvdata(dev);
 379        mutex_lock(&data->update_lock);
 380        select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
 381        if (select < 0)
 382                ret = select;
 383        else if (select & (1 << (index - 1)))
 384                ret = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET);
 385        else
 386                ret = 0;
 387        mutex_unlock(&data->update_lock);
 388        return ret < 0 ? ret : sprintf(buf, "%d\n", max6581_offset_to_millic(ret));
 389}
 390
 391static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
 392static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
 393static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
 394
 395static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
 396static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
 397static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
 398
 399static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
 400static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
 401static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
 402
 403static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
 404static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
 405static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
 406
 407static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
 408static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
 409static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
 410
 411static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
 412static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
 413static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
 414
 415static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
 416static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
 417static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
 418
 419static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
 420static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
 421static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
 422
 423static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
 424static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
 425static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
 426static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
 427static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
 428static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
 429static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
 430static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
 431
 432static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
 433static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
 434static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
 435static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
 436static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
 437static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
 438static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
 439static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
 440
 441static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
 442static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
 443static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
 444static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
 445static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
 446static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
 447static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
 448
 449/* There is no offset for local temperature so starting from temp2 */
 450static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1);
 451static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2);
 452static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3);
 453static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4);
 454static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5);
 455static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6);
 456static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 7);
 457
 458static DEVICE_ATTR(dummy, 0, NULL, NULL);
 459
 460static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
 461                                  int index)
 462{
 463        struct device *dev = kobj_to_dev(kobj);
 464        struct max6697_data *data = dev_get_drvdata(dev);
 465        const struct max6697_chip_data *chip = data->chip;
 466        int channel = index / 7;        /* channel number */
 467        int nr = index % 7;             /* attribute index within channel */
 468
 469        if (channel >= chip->channels)
 470                return 0;
 471
 472        if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
 473                return 0;
 474        if (nr == 5 && !(chip->have_fault & (1 << channel)))
 475                return 0;
 476        /* offset reg is only supported on max6581 remote channels */
 477        if (nr == 6)
 478                if (data->type != max6581 || channel == 0)
 479                        return 0;
 480
 481        return attr->mode;
 482}
 483
 484/*
 485 * max6697_is_visible uses the index into the following array to determine
 486 * if attributes should be created or not. Any change in order or content
 487 * must be matched in max6697_is_visible.
 488 */
 489static struct attribute *max6697_attributes[] = {
 490        &sensor_dev_attr_temp1_input.dev_attr.attr,
 491        &sensor_dev_attr_temp1_max.dev_attr.attr,
 492        &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 493        &sensor_dev_attr_temp1_crit.dev_attr.attr,
 494        &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 495        &dev_attr_dummy.attr,
 496        &dev_attr_dummy.attr,
 497
 498        &sensor_dev_attr_temp2_input.dev_attr.attr,
 499        &sensor_dev_attr_temp2_max.dev_attr.attr,
 500        &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 501        &sensor_dev_attr_temp2_crit.dev_attr.attr,
 502        &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 503        &sensor_dev_attr_temp2_fault.dev_attr.attr,
 504        &sensor_dev_attr_temp2_offset.dev_attr.attr,
 505
 506        &sensor_dev_attr_temp3_input.dev_attr.attr,
 507        &sensor_dev_attr_temp3_max.dev_attr.attr,
 508        &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 509        &sensor_dev_attr_temp3_crit.dev_attr.attr,
 510        &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 511        &sensor_dev_attr_temp3_fault.dev_attr.attr,
 512        &sensor_dev_attr_temp3_offset.dev_attr.attr,
 513
 514        &sensor_dev_attr_temp4_input.dev_attr.attr,
 515        &sensor_dev_attr_temp4_max.dev_attr.attr,
 516        &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 517        &sensor_dev_attr_temp4_crit.dev_attr.attr,
 518        &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 519        &sensor_dev_attr_temp4_fault.dev_attr.attr,
 520        &sensor_dev_attr_temp4_offset.dev_attr.attr,
 521
 522        &sensor_dev_attr_temp5_input.dev_attr.attr,
 523        &sensor_dev_attr_temp5_max.dev_attr.attr,
 524        &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 525        &sensor_dev_attr_temp5_crit.dev_attr.attr,
 526        &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
 527        &sensor_dev_attr_temp5_fault.dev_attr.attr,
 528        &sensor_dev_attr_temp5_offset.dev_attr.attr,
 529
 530        &sensor_dev_attr_temp6_input.dev_attr.attr,
 531        &sensor_dev_attr_temp6_max.dev_attr.attr,
 532        &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
 533        &sensor_dev_attr_temp6_crit.dev_attr.attr,
 534        &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
 535        &sensor_dev_attr_temp6_fault.dev_attr.attr,
 536        &sensor_dev_attr_temp6_offset.dev_attr.attr,
 537
 538        &sensor_dev_attr_temp7_input.dev_attr.attr,
 539        &sensor_dev_attr_temp7_max.dev_attr.attr,
 540        &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
 541        &sensor_dev_attr_temp7_crit.dev_attr.attr,
 542        &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
 543        &sensor_dev_attr_temp7_fault.dev_attr.attr,
 544        &sensor_dev_attr_temp7_offset.dev_attr.attr,
 545
 546        &sensor_dev_attr_temp8_input.dev_attr.attr,
 547        &sensor_dev_attr_temp8_max.dev_attr.attr,
 548        &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
 549        &sensor_dev_attr_temp8_crit.dev_attr.attr,
 550        &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
 551        &sensor_dev_attr_temp8_fault.dev_attr.attr,
 552        &sensor_dev_attr_temp8_offset.dev_attr.attr,
 553        NULL
 554};
 555
 556static const struct attribute_group max6697_group = {
 557        .attrs = max6697_attributes, .is_visible = max6697_is_visible,
 558};
 559__ATTRIBUTE_GROUPS(max6697);
 560
 561static void max6697_get_config_of(struct device_node *node,
 562                                  struct max6697_platform_data *pdata)
 563{
 564        int len;
 565        const __be32 *prop;
 566
 567        pdata->smbus_timeout_disable =
 568                of_property_read_bool(node, "smbus-timeout-disable");
 569        pdata->extended_range_enable =
 570                of_property_read_bool(node, "extended-range-enable");
 571        pdata->beta_compensation =
 572                of_property_read_bool(node, "beta-compensation-enable");
 573
 574        prop = of_get_property(node, "alert-mask", &len);
 575        if (prop && len == sizeof(u32))
 576                pdata->alert_mask = be32_to_cpu(prop[0]);
 577        prop = of_get_property(node, "over-temperature-mask", &len);
 578        if (prop && len == sizeof(u32))
 579                pdata->over_temperature_mask = be32_to_cpu(prop[0]);
 580        prop = of_get_property(node, "resistance-cancellation", &len);
 581        if (prop) {
 582                if (len == sizeof(u32))
 583                        pdata->resistance_cancellation = be32_to_cpu(prop[0]);
 584                else
 585                        pdata->resistance_cancellation = 0xfe;
 586        }
 587        prop = of_get_property(node, "transistor-ideality", &len);
 588        if (prop && len == 2 * sizeof(u32)) {
 589                        pdata->ideality_mask = be32_to_cpu(prop[0]);
 590                        pdata->ideality_value = be32_to_cpu(prop[1]);
 591        }
 592}
 593
 594static int max6697_init_chip(struct max6697_data *data,
 595                             struct i2c_client *client)
 596{
 597        struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
 598        struct max6697_platform_data p;
 599        const struct max6697_chip_data *chip = data->chip;
 600        int factor = chip->channels;
 601        int ret, reg;
 602
 603        /*
 604         * Don't touch configuration if neither platform data nor OF
 605         * configuration was specified. If that is the case, use the
 606         * current chip configuration.
 607         */
 608        if (!pdata && !client->dev.of_node) {
 609                reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
 610                if (reg < 0)
 611                        return reg;
 612                if (data->type == max6581) {
 613                        if (reg & MAX6581_CONF_EXTENDED)
 614                                data->temp_offset = 64;
 615                        reg = i2c_smbus_read_byte_data(client,
 616                                                       MAX6581_REG_RESISTANCE);
 617                        if (reg < 0)
 618                                return reg;
 619                        factor += hweight8(reg);
 620                } else {
 621                        if (reg & MAX6697_CONF_RESISTANCE)
 622                                factor++;
 623                }
 624                goto done;
 625        }
 626
 627        if (client->dev.of_node) {
 628                memset(&p, 0, sizeof(p));
 629                max6697_get_config_of(client->dev.of_node, &p);
 630                pdata = &p;
 631        }
 632
 633        reg = 0;
 634        if (pdata->smbus_timeout_disable &&
 635            (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
 636                reg |= MAX6697_CONF_TIMEOUT;
 637        }
 638        if (pdata->extended_range_enable &&
 639            (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
 640                reg |= MAX6581_CONF_EXTENDED;
 641                data->temp_offset = 64;
 642        }
 643        if (pdata->resistance_cancellation &&
 644            (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
 645                reg |= MAX6697_CONF_RESISTANCE;
 646                factor++;
 647        }
 648        if (pdata->beta_compensation &&
 649            (chip->valid_conf & MAX6693_CONF_BETA)) {
 650                reg |= MAX6693_CONF_BETA;
 651        }
 652
 653        ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
 654        if (ret < 0)
 655                return ret;
 656
 657        ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
 658                                MAX6697_ALERT_MAP_BITS(pdata->alert_mask));
 659        if (ret < 0)
 660                return ret;
 661
 662        ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
 663                        MAX6697_OVERT_MAP_BITS(pdata->over_temperature_mask));
 664        if (ret < 0)
 665                return ret;
 666
 667        if (data->type == max6581) {
 668                factor += hweight8(pdata->resistance_cancellation >> 1);
 669                ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
 670                                        pdata->resistance_cancellation >> 1);
 671                if (ret < 0)
 672                        return ret;
 673                ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
 674                                                pdata->ideality_value);
 675                if (ret < 0)
 676                        return ret;
 677                ret = i2c_smbus_write_byte_data(client,
 678                                                MAX6581_REG_IDEALITY_SELECT,
 679                                                pdata->ideality_mask >> 1);
 680                if (ret < 0)
 681                        return ret;
 682        }
 683done:
 684        data->update_interval = factor * MAX6697_CONV_TIME;
 685        return 0;
 686}
 687
 688static const struct i2c_device_id max6697_id[];
 689
 690static int max6697_probe(struct i2c_client *client)
 691{
 692        struct i2c_adapter *adapter = client->adapter;
 693        struct device *dev = &client->dev;
 694        struct max6697_data *data;
 695        struct device *hwmon_dev;
 696        int err;
 697
 698        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 699                return -ENODEV;
 700
 701        data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
 702        if (!data)
 703                return -ENOMEM;
 704
 705        if (client->dev.of_node)
 706                data->type = (enum chips)of_device_get_match_data(&client->dev);
 707        else
 708                data->type = i2c_match_id(max6697_id, client)->driver_data;
 709        data->chip = &max6697_chip_data[data->type];
 710        data->client = client;
 711        mutex_init(&data->update_lock);
 712
 713        err = max6697_init_chip(data, client);
 714        if (err)
 715                return err;
 716
 717        hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 718                                                           data,
 719                                                           max6697_groups);
 720        return PTR_ERR_OR_ZERO(hwmon_dev);
 721}
 722
 723static const struct i2c_device_id max6697_id[] = {
 724        { "max6581", max6581 },
 725        { "max6602", max6602 },
 726        { "max6622", max6622 },
 727        { "max6636", max6636 },
 728        { "max6689", max6689 },
 729        { "max6693", max6693 },
 730        { "max6694", max6694 },
 731        { "max6697", max6697 },
 732        { "max6698", max6698 },
 733        { "max6699", max6699 },
 734        { }
 735};
 736MODULE_DEVICE_TABLE(i2c, max6697_id);
 737
 738static const struct of_device_id __maybe_unused max6697_of_match[] = {
 739        {
 740                .compatible = "maxim,max6581",
 741                .data = (void *)max6581
 742        },
 743        {
 744                .compatible = "maxim,max6602",
 745                .data = (void *)max6602
 746        },
 747        {
 748                .compatible = "maxim,max6622",
 749                .data = (void *)max6622
 750        },
 751        {
 752                .compatible = "maxim,max6636",
 753                .data = (void *)max6636
 754        },
 755        {
 756                .compatible = "maxim,max6689",
 757                .data = (void *)max6689
 758        },
 759        {
 760                .compatible = "maxim,max6693",
 761                .data = (void *)max6693
 762        },
 763        {
 764                .compatible = "maxim,max6694",
 765                .data = (void *)max6694
 766        },
 767        {
 768                .compatible = "maxim,max6697",
 769                .data = (void *)max6697
 770        },
 771        {
 772                .compatible = "maxim,max6698",
 773                .data = (void *)max6698
 774        },
 775        {
 776                .compatible = "maxim,max6699",
 777                .data = (void *)max6699
 778        },
 779        { },
 780};
 781MODULE_DEVICE_TABLE(of, max6697_of_match);
 782
 783static struct i2c_driver max6697_driver = {
 784        .class = I2C_CLASS_HWMON,
 785        .driver = {
 786                .name   = "max6697",
 787                .of_match_table = of_match_ptr(max6697_of_match),
 788        },
 789        .probe_new = max6697_probe,
 790        .id_table = max6697_id,
 791};
 792
 793module_i2c_driver(max6697_driver);
 794
 795MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 796MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
 797MODULE_LICENSE("GPL");
 798