linux/drivers/hwmon/jc42.c
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   1/*
   2 * jc42.c - driver for Jedec JC42.4 compliant temperature sensors
   3 *
   4 * Copyright (c) 2010  Ericsson AB.
   5 *
   6 * Derived from lm77.c by Andras BALI <drewie@freemail.hu>.
   7 *
   8 * JC42.4 compliant temperature sensors are typically used on memory modules.
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25#include <linux/module.h>
  26#include <linux/init.h>
  27#include <linux/slab.h>
  28#include <linux/jiffies.h>
  29#include <linux/i2c.h>
  30#include <linux/hwmon.h>
  31#include <linux/hwmon-sysfs.h>
  32#include <linux/err.h>
  33#include <linux/mutex.h>
  34
  35/* Addresses to scan */
  36static const unsigned short normal_i2c[] = {
  37        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, I2C_CLIENT_END };
  38
  39/* JC42 registers. All registers are 16 bit. */
  40#define JC42_REG_CAP            0x00
  41#define JC42_REG_CONFIG         0x01
  42#define JC42_REG_TEMP_UPPER     0x02
  43#define JC42_REG_TEMP_LOWER     0x03
  44#define JC42_REG_TEMP_CRITICAL  0x04
  45#define JC42_REG_TEMP           0x05
  46#define JC42_REG_MANID          0x06
  47#define JC42_REG_DEVICEID       0x07
  48
  49/* Status bits in temperature register */
  50#define JC42_ALARM_CRIT_BIT     15
  51#define JC42_ALARM_MAX_BIT      14
  52#define JC42_ALARM_MIN_BIT      13
  53
  54/* Configuration register defines */
  55#define JC42_CFG_CRIT_ONLY      (1 << 2)
  56#define JC42_CFG_TCRIT_LOCK     (1 << 6)
  57#define JC42_CFG_EVENT_LOCK     (1 << 7)
  58#define JC42_CFG_SHUTDOWN       (1 << 8)
  59#define JC42_CFG_HYST_SHIFT     9
  60#define JC42_CFG_HYST_MASK      (0x03 << 9)
  61
  62/* Capabilities */
  63#define JC42_CAP_RANGE          (1 << 2)
  64
  65/* Manufacturer IDs */
  66#define ADT_MANID               0x11d4  /* Analog Devices */
  67#define ATMEL_MANID             0x001f  /* Atmel */
  68#define MAX_MANID               0x004d  /* Maxim */
  69#define IDT_MANID               0x00b3  /* IDT */
  70#define MCP_MANID               0x0054  /* Microchip */
  71#define NXP_MANID               0x1131  /* NXP Semiconductors */
  72#define ONS_MANID               0x1b09  /* ON Semiconductor */
  73#define STM_MANID               0x104a  /* ST Microelectronics */
  74
  75/* Supported chips */
  76
  77/* Analog Devices */
  78#define ADT7408_DEVID           0x0801
  79#define ADT7408_DEVID_MASK      0xffff
  80
  81/* Atmel */
  82#define AT30TS00_DEVID          0x8201
  83#define AT30TS00_DEVID_MASK     0xffff
  84
  85/* IDT */
  86#define TS3000B3_DEVID          0x2903  /* Also matches TSE2002B3 */
  87#define TS3000B3_DEVID_MASK     0xffff
  88
  89#define TS3000GB2_DEVID         0x2912  /* Also matches TSE2002GB2 */
  90#define TS3000GB2_DEVID_MASK    0xffff
  91
  92/* Maxim */
  93#define MAX6604_DEVID           0x3e00
  94#define MAX6604_DEVID_MASK      0xffff
  95
  96/* Microchip */
  97#define MCP9804_DEVID           0x0200
  98#define MCP9804_DEVID_MASK      0xfffc
  99
 100#define MCP98242_DEVID          0x2000
 101#define MCP98242_DEVID_MASK     0xfffc
 102
 103#define MCP98243_DEVID          0x2100
 104#define MCP98243_DEVID_MASK     0xfffc
 105
 106#define MCP98244_DEVID          0x2200
 107#define MCP98244_DEVID_MASK     0xfffc
 108
 109#define MCP9843_DEVID           0x0000  /* Also matches mcp9805 */
 110#define MCP9843_DEVID_MASK      0xfffe
 111
 112/* NXP */
 113#define SE97_DEVID              0xa200
 114#define SE97_DEVID_MASK         0xfffc
 115
 116#define SE98_DEVID              0xa100
 117#define SE98_DEVID_MASK         0xfffc
 118
 119/* ON Semiconductor */
 120#define CAT6095_DEVID           0x0800  /* Also matches CAT34TS02 */
 121#define CAT6095_DEVID_MASK      0xffe0
 122
 123/* ST Microelectronics */
 124#define STTS424_DEVID           0x0101
 125#define STTS424_DEVID_MASK      0xffff
 126
 127#define STTS424E_DEVID          0x0000
 128#define STTS424E_DEVID_MASK     0xfffe
 129
 130#define STTS2002_DEVID          0x0300
 131#define STTS2002_DEVID_MASK     0xffff
 132
 133#define STTS3000_DEVID          0x0200
 134#define STTS3000_DEVID_MASK     0xffff
 135
 136static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 };
 137
 138struct jc42_chips {
 139        u16 manid;
 140        u16 devid;
 141        u16 devid_mask;
 142};
 143
 144static struct jc42_chips jc42_chips[] = {
 145        { ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK },
 146        { ATMEL_MANID, AT30TS00_DEVID, AT30TS00_DEVID_MASK },
 147        { IDT_MANID, TS3000B3_DEVID, TS3000B3_DEVID_MASK },
 148        { IDT_MANID, TS3000GB2_DEVID, TS3000GB2_DEVID_MASK },
 149        { MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK },
 150        { MCP_MANID, MCP9804_DEVID, MCP9804_DEVID_MASK },
 151        { MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK },
 152        { MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK },
 153        { MCP_MANID, MCP98244_DEVID, MCP98244_DEVID_MASK },
 154        { MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK },
 155        { NXP_MANID, SE97_DEVID, SE97_DEVID_MASK },
 156        { ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK },
 157        { NXP_MANID, SE98_DEVID, SE98_DEVID_MASK },
 158        { STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK },
 159        { STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK },
 160        { STM_MANID, STTS2002_DEVID, STTS2002_DEVID_MASK },
 161        { STM_MANID, STTS3000_DEVID, STTS3000_DEVID_MASK },
 162};
 163
 164/* Each client has this additional data */
 165struct jc42_data {
 166        struct device   *hwmon_dev;
 167        struct mutex    update_lock;    /* protect register access */
 168        bool            extended;       /* true if extended range supported */
 169        bool            valid;
 170        unsigned long   last_updated;   /* In jiffies */
 171        u16             orig_config;    /* original configuration */
 172        u16             config;         /* current configuration */
 173        u16             temp_input;     /* Temperatures */
 174        u16             temp_crit;
 175        u16             temp_min;
 176        u16             temp_max;
 177};
 178
 179static int jc42_probe(struct i2c_client *client,
 180                      const struct i2c_device_id *id);
 181static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info);
 182static int jc42_remove(struct i2c_client *client);
 183
 184static struct jc42_data *jc42_update_device(struct device *dev);
 185
 186static const struct i2c_device_id jc42_id[] = {
 187        { "jc42", 0 },
 188        { }
 189};
 190MODULE_DEVICE_TABLE(i2c, jc42_id);
 191
 192#ifdef CONFIG_PM
 193
 194static int jc42_suspend(struct device *dev)
 195{
 196        struct i2c_client *client = to_i2c_client(dev);
 197        struct jc42_data *data = i2c_get_clientdata(client);
 198
 199        data->config |= JC42_CFG_SHUTDOWN;
 200        i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, data->config);
 201        return 0;
 202}
 203
 204static int jc42_resume(struct device *dev)
 205{
 206        struct i2c_client *client = to_i2c_client(dev);
 207        struct jc42_data *data = i2c_get_clientdata(client);
 208
 209        data->config &= ~JC42_CFG_SHUTDOWN;
 210        i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, data->config);
 211        return 0;
 212}
 213
 214static const struct dev_pm_ops jc42_dev_pm_ops = {
 215        .suspend = jc42_suspend,
 216        .resume = jc42_resume,
 217};
 218
 219#define JC42_DEV_PM_OPS (&jc42_dev_pm_ops)
 220#else
 221#define JC42_DEV_PM_OPS NULL
 222#endif /* CONFIG_PM */
 223
 224/* This is the driver that will be inserted */
 225static struct i2c_driver jc42_driver = {
 226        .class          = I2C_CLASS_SPD,
 227        .driver = {
 228                .name   = "jc42",
 229                .pm = JC42_DEV_PM_OPS,
 230        },
 231        .probe          = jc42_probe,
 232        .remove         = jc42_remove,
 233        .id_table       = jc42_id,
 234        .detect         = jc42_detect,
 235        .address_list   = normal_i2c,
 236};
 237
 238#define JC42_TEMP_MIN_EXTENDED  (-40000)
 239#define JC42_TEMP_MIN           0
 240#define JC42_TEMP_MAX           125000
 241
 242static u16 jc42_temp_to_reg(int temp, bool extended)
 243{
 244        int ntemp = clamp_val(temp,
 245                              extended ? JC42_TEMP_MIN_EXTENDED :
 246                              JC42_TEMP_MIN, JC42_TEMP_MAX);
 247
 248        /* convert from 0.001 to 0.0625 resolution */
 249        return (ntemp * 2 / 125) & 0x1fff;
 250}
 251
 252static int jc42_temp_from_reg(s16 reg)
 253{
 254        reg &= 0x1fff;
 255
 256        /* sign extend register */
 257        if (reg & 0x1000)
 258                reg |= 0xf000;
 259
 260        /* convert from 0.0625 to 0.001 resolution */
 261        return reg * 125 / 2;
 262}
 263
 264/* sysfs stuff */
 265
 266/* read routines for temperature limits */
 267#define show(value)     \
 268static ssize_t show_##value(struct device *dev,                         \
 269                            struct device_attribute *attr,              \
 270                            char *buf)                                  \
 271{                                                                       \
 272        struct jc42_data *data = jc42_update_device(dev);               \
 273        if (IS_ERR(data))                                               \
 274                return PTR_ERR(data);                                   \
 275        return sprintf(buf, "%d\n", jc42_temp_from_reg(data->value));   \
 276}
 277
 278show(temp_input);
 279show(temp_crit);
 280show(temp_min);
 281show(temp_max);
 282
 283/* read routines for hysteresis values */
 284static ssize_t show_temp_crit_hyst(struct device *dev,
 285                                   struct device_attribute *attr, char *buf)
 286{
 287        struct jc42_data *data = jc42_update_device(dev);
 288        int temp, hyst;
 289
 290        if (IS_ERR(data))
 291                return PTR_ERR(data);
 292
 293        temp = jc42_temp_from_reg(data->temp_crit);
 294        hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK)
 295                               >> JC42_CFG_HYST_SHIFT];
 296        return sprintf(buf, "%d\n", temp - hyst);
 297}
 298
 299static ssize_t show_temp_max_hyst(struct device *dev,
 300                                  struct device_attribute *attr, char *buf)
 301{
 302        struct jc42_data *data = jc42_update_device(dev);
 303        int temp, hyst;
 304
 305        if (IS_ERR(data))
 306                return PTR_ERR(data);
 307
 308        temp = jc42_temp_from_reg(data->temp_max);
 309        hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK)
 310                               >> JC42_CFG_HYST_SHIFT];
 311        return sprintf(buf, "%d\n", temp - hyst);
 312}
 313
 314/* write routines */
 315#define set(value, reg) \
 316static ssize_t set_##value(struct device *dev,                          \
 317                           struct device_attribute *attr,               \
 318                           const char *buf, size_t count)               \
 319{                                                                       \
 320        struct i2c_client *client = to_i2c_client(dev);                 \
 321        struct jc42_data *data = i2c_get_clientdata(client);            \
 322        int err, ret = count;                                           \
 323        long val;                                                       \
 324        if (kstrtol(buf, 10, &val) < 0)                         \
 325                return -EINVAL;                                         \
 326        mutex_lock(&data->update_lock);                                 \
 327        data->value = jc42_temp_to_reg(val, data->extended);            \
 328        err = i2c_smbus_write_word_swapped(client, reg, data->value);   \
 329        if (err < 0)                                                    \
 330                ret = err;                                              \
 331        mutex_unlock(&data->update_lock);                               \
 332        return ret;                                                     \
 333}
 334
 335set(temp_min, JC42_REG_TEMP_LOWER);
 336set(temp_max, JC42_REG_TEMP_UPPER);
 337set(temp_crit, JC42_REG_TEMP_CRITICAL);
 338
 339/*
 340 * JC42.4 compliant chips only support four hysteresis values.
 341 * Pick best choice and go from there.
 342 */
 343static ssize_t set_temp_crit_hyst(struct device *dev,
 344                                  struct device_attribute *attr,
 345                                  const char *buf, size_t count)
 346{
 347        struct i2c_client *client = to_i2c_client(dev);
 348        struct jc42_data *data = i2c_get_clientdata(client);
 349        unsigned long val;
 350        int diff, hyst;
 351        int err;
 352        int ret = count;
 353
 354        if (kstrtoul(buf, 10, &val) < 0)
 355                return -EINVAL;
 356
 357        diff = jc42_temp_from_reg(data->temp_crit) - val;
 358        hyst = 0;
 359        if (diff > 0) {
 360                if (diff < 2250)
 361                        hyst = 1;       /* 1.5 degrees C */
 362                else if (diff < 4500)
 363                        hyst = 2;       /* 3.0 degrees C */
 364                else
 365                        hyst = 3;       /* 6.0 degrees C */
 366        }
 367
 368        mutex_lock(&data->update_lock);
 369        data->config = (data->config & ~JC42_CFG_HYST_MASK)
 370          | (hyst << JC42_CFG_HYST_SHIFT);
 371        err = i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG,
 372                                           data->config);
 373        if (err < 0)
 374                ret = err;
 375        mutex_unlock(&data->update_lock);
 376        return ret;
 377}
 378
 379static ssize_t show_alarm(struct device *dev,
 380                          struct device_attribute *attr, char *buf)
 381{
 382        u16 bit = to_sensor_dev_attr(attr)->index;
 383        struct jc42_data *data = jc42_update_device(dev);
 384        u16 val;
 385
 386        if (IS_ERR(data))
 387                return PTR_ERR(data);
 388
 389        val = data->temp_input;
 390        if (bit != JC42_ALARM_CRIT_BIT && (data->config & JC42_CFG_CRIT_ONLY))
 391                val = 0;
 392        return sprintf(buf, "%u\n", (val >> bit) & 1);
 393}
 394
 395static DEVICE_ATTR(temp1_input, S_IRUGO,
 396                   show_temp_input, NULL);
 397static DEVICE_ATTR(temp1_crit, S_IRUGO,
 398                   show_temp_crit, set_temp_crit);
 399static DEVICE_ATTR(temp1_min, S_IRUGO,
 400                   show_temp_min, set_temp_min);
 401static DEVICE_ATTR(temp1_max, S_IRUGO,
 402                   show_temp_max, set_temp_max);
 403
 404static DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
 405                   show_temp_crit_hyst, set_temp_crit_hyst);
 406static DEVICE_ATTR(temp1_max_hyst, S_IRUGO,
 407                   show_temp_max_hyst, NULL);
 408
 409static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
 410                          JC42_ALARM_CRIT_BIT);
 411static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
 412                          JC42_ALARM_MIN_BIT);
 413static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
 414                          JC42_ALARM_MAX_BIT);
 415
 416static struct attribute *jc42_attributes[] = {
 417        &dev_attr_temp1_input.attr,
 418        &dev_attr_temp1_crit.attr,
 419        &dev_attr_temp1_min.attr,
 420        &dev_attr_temp1_max.attr,
 421        &dev_attr_temp1_crit_hyst.attr,
 422        &dev_attr_temp1_max_hyst.attr,
 423        &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 424        &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 425        &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 426        NULL
 427};
 428
 429static umode_t jc42_attribute_mode(struct kobject *kobj,
 430                                  struct attribute *attr, int index)
 431{
 432        struct device *dev = container_of(kobj, struct device, kobj);
 433        struct i2c_client *client = to_i2c_client(dev);
 434        struct jc42_data *data = i2c_get_clientdata(client);
 435        unsigned int config = data->config;
 436        bool readonly;
 437
 438        if (attr == &dev_attr_temp1_crit.attr)
 439                readonly = config & JC42_CFG_TCRIT_LOCK;
 440        else if (attr == &dev_attr_temp1_min.attr ||
 441                 attr == &dev_attr_temp1_max.attr)
 442                readonly = config & JC42_CFG_EVENT_LOCK;
 443        else if (attr == &dev_attr_temp1_crit_hyst.attr)
 444                readonly = config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK);
 445        else
 446                readonly = true;
 447
 448        return S_IRUGO | (readonly ? 0 : S_IWUSR);
 449}
 450
 451static const struct attribute_group jc42_group = {
 452        .attrs = jc42_attributes,
 453        .is_visible = jc42_attribute_mode,
 454};
 455
 456/* Return 0 if detection is successful, -ENODEV otherwise */
 457static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info)
 458{
 459        struct i2c_adapter *adapter = client->adapter;
 460        int i, config, cap, manid, devid;
 461
 462        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 463                                     I2C_FUNC_SMBUS_WORD_DATA))
 464                return -ENODEV;
 465
 466        cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP);
 467        config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
 468        manid = i2c_smbus_read_word_swapped(client, JC42_REG_MANID);
 469        devid = i2c_smbus_read_word_swapped(client, JC42_REG_DEVICEID);
 470
 471        if (cap < 0 || config < 0 || manid < 0 || devid < 0)
 472                return -ENODEV;
 473
 474        if ((cap & 0xff00) || (config & 0xf800))
 475                return -ENODEV;
 476
 477        for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) {
 478                struct jc42_chips *chip = &jc42_chips[i];
 479                if (manid == chip->manid &&
 480                    (devid & chip->devid_mask) == chip->devid) {
 481                        strlcpy(info->type, "jc42", I2C_NAME_SIZE);
 482                        return 0;
 483                }
 484        }
 485        return -ENODEV;
 486}
 487
 488static int jc42_probe(struct i2c_client *client, const struct i2c_device_id *id)
 489{
 490        struct jc42_data *data;
 491        int config, cap, err;
 492        struct device *dev = &client->dev;
 493
 494        data = devm_kzalloc(dev, sizeof(struct jc42_data), GFP_KERNEL);
 495        if (!data)
 496                return -ENOMEM;
 497
 498        i2c_set_clientdata(client, data);
 499        mutex_init(&data->update_lock);
 500
 501        cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP);
 502        if (cap < 0)
 503                return cap;
 504
 505        data->extended = !!(cap & JC42_CAP_RANGE);
 506
 507        config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
 508        if (config < 0)
 509                return config;
 510
 511        data->orig_config = config;
 512        if (config & JC42_CFG_SHUTDOWN) {
 513                config &= ~JC42_CFG_SHUTDOWN;
 514                i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
 515        }
 516        data->config = config;
 517
 518        /* Register sysfs hooks */
 519        err = sysfs_create_group(&dev->kobj, &jc42_group);
 520        if (err)
 521                return err;
 522
 523        data->hwmon_dev = hwmon_device_register(dev);
 524        if (IS_ERR(data->hwmon_dev)) {
 525                err = PTR_ERR(data->hwmon_dev);
 526                goto exit_remove;
 527        }
 528
 529        return 0;
 530
 531exit_remove:
 532        sysfs_remove_group(&dev->kobj, &jc42_group);
 533        return err;
 534}
 535
 536static int jc42_remove(struct i2c_client *client)
 537{
 538        struct jc42_data *data = i2c_get_clientdata(client);
 539        hwmon_device_unregister(data->hwmon_dev);
 540        sysfs_remove_group(&client->dev.kobj, &jc42_group);
 541
 542        /* Restore original configuration except hysteresis */
 543        if ((data->config & ~JC42_CFG_HYST_MASK) !=
 544            (data->orig_config & ~JC42_CFG_HYST_MASK)) {
 545                int config;
 546
 547                config = (data->orig_config & ~JC42_CFG_HYST_MASK)
 548                  | (data->config & JC42_CFG_HYST_MASK);
 549                i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
 550        }
 551        return 0;
 552}
 553
 554static struct jc42_data *jc42_update_device(struct device *dev)
 555{
 556        struct i2c_client *client = to_i2c_client(dev);
 557        struct jc42_data *data = i2c_get_clientdata(client);
 558        struct jc42_data *ret = data;
 559        int val;
 560
 561        mutex_lock(&data->update_lock);
 562
 563        if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 564                val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP);
 565                if (val < 0) {
 566                        ret = ERR_PTR(val);
 567                        goto abort;
 568                }
 569                data->temp_input = val;
 570
 571                val = i2c_smbus_read_word_swapped(client,
 572                                                  JC42_REG_TEMP_CRITICAL);
 573                if (val < 0) {
 574                        ret = ERR_PTR(val);
 575                        goto abort;
 576                }
 577                data->temp_crit = val;
 578
 579                val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP_LOWER);
 580                if (val < 0) {
 581                        ret = ERR_PTR(val);
 582                        goto abort;
 583                }
 584                data->temp_min = val;
 585
 586                val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP_UPPER);
 587                if (val < 0) {
 588                        ret = ERR_PTR(val);
 589                        goto abort;
 590                }
 591                data->temp_max = val;
 592
 593                data->last_updated = jiffies;
 594                data->valid = true;
 595        }
 596abort:
 597        mutex_unlock(&data->update_lock);
 598        return ret;
 599}
 600
 601module_i2c_driver(jc42_driver);
 602
 603MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 604MODULE_DESCRIPTION("JC42 driver");
 605MODULE_LICENSE("GPL");
 606
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