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 MCP9843_DEVID           0x0000  /* Also matches mcp9805 */
 107#define MCP9843_DEVID_MASK      0xfffe
 108
 109/* NXP */
 110#define SE97_DEVID              0xa200
 111#define SE97_DEVID_MASK         0xfffc
 112
 113#define SE98_DEVID              0xa100
 114#define SE98_DEVID_MASK         0xfffc
 115
 116/* ON Semiconductor */
 117#define CAT6095_DEVID           0x0800  /* Also matches CAT34TS02 */
 118#define CAT6095_DEVID_MASK      0xffe0
 119
 120/* ST Microelectronics */
 121#define STTS424_DEVID           0x0101
 122#define STTS424_DEVID_MASK      0xffff
 123
 124#define STTS424E_DEVID          0x0000
 125#define STTS424E_DEVID_MASK     0xfffe
 126
 127#define STTS2002_DEVID          0x0300
 128#define STTS2002_DEVID_MASK     0xffff
 129
 130#define STTS3000_DEVID          0x0200
 131#define STTS3000_DEVID_MASK     0xffff
 132
 133static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 };
 134
 135struct jc42_chips {
 136        u16 manid;
 137        u16 devid;
 138        u16 devid_mask;
 139};
 140
 141static struct jc42_chips jc42_chips[] = {
 142        { ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK },
 143        { ATMEL_MANID, AT30TS00_DEVID, AT30TS00_DEVID_MASK },
 144        { IDT_MANID, TS3000B3_DEVID, TS3000B3_DEVID_MASK },
 145        { IDT_MANID, TS3000GB2_DEVID, TS3000GB2_DEVID_MASK },
 146        { MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK },
 147        { MCP_MANID, MCP9804_DEVID, MCP9804_DEVID_MASK },
 148        { MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK },
 149        { MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK },
 150        { MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK },
 151        { NXP_MANID, SE97_DEVID, SE97_DEVID_MASK },
 152        { ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK },
 153        { NXP_MANID, SE98_DEVID, SE98_DEVID_MASK },
 154        { STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK },
 155        { STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK },
 156        { STM_MANID, STTS2002_DEVID, STTS2002_DEVID_MASK },
 157        { STM_MANID, STTS3000_DEVID, STTS3000_DEVID_MASK },
 158};
 159
 160/* Each client has this additional data */
 161struct jc42_data {
 162        struct device   *hwmon_dev;
 163        struct mutex    update_lock;    /* protect register access */
 164        bool            extended;       /* true if extended range supported */
 165        bool            valid;
 166        unsigned long   last_updated;   /* In jiffies */
 167        u16             orig_config;    /* original configuration */
 168        u16             config;         /* current configuration */
 169        u16             temp_input;     /* Temperatures */
 170        u16             temp_crit;
 171        u16             temp_min;
 172        u16             temp_max;
 173};
 174
 175static int jc42_probe(struct i2c_client *client,
 176                      const struct i2c_device_id *id);
 177static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info);
 178static int jc42_remove(struct i2c_client *client);
 179
 180static struct jc42_data *jc42_update_device(struct device *dev);
 181
 182static const struct i2c_device_id jc42_id[] = {
 183        { "jc42", 0 },
 184        { }
 185};
 186MODULE_DEVICE_TABLE(i2c, jc42_id);
 187
 188#ifdef CONFIG_PM
 189
 190static int jc42_suspend(struct device *dev)
 191{
 192        struct i2c_client *client = to_i2c_client(dev);
 193        struct jc42_data *data = i2c_get_clientdata(client);
 194
 195        data->config |= JC42_CFG_SHUTDOWN;
 196        i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, data->config);
 197        return 0;
 198}
 199
 200static int jc42_resume(struct device *dev)
 201{
 202        struct i2c_client *client = to_i2c_client(dev);
 203        struct jc42_data *data = i2c_get_clientdata(client);
 204
 205        data->config &= ~JC42_CFG_SHUTDOWN;
 206        i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, data->config);
 207        return 0;
 208}
 209
 210static const struct dev_pm_ops jc42_dev_pm_ops = {
 211        .suspend = jc42_suspend,
 212        .resume = jc42_resume,
 213};
 214
 215#define JC42_DEV_PM_OPS (&jc42_dev_pm_ops)
 216#else
 217#define JC42_DEV_PM_OPS NULL
 218#endif /* CONFIG_PM */
 219
 220/* This is the driver that will be inserted */
 221static struct i2c_driver jc42_driver = {
 222        .class          = I2C_CLASS_SPD,
 223        .driver = {
 224                .name   = "jc42",
 225                .pm = JC42_DEV_PM_OPS,
 226        },
 227        .probe          = jc42_probe,
 228        .remove         = jc42_remove,
 229        .id_table       = jc42_id,
 230        .detect         = jc42_detect,
 231        .address_list   = normal_i2c,
 232};
 233
 234#define JC42_TEMP_MIN_EXTENDED  (-40000)
 235#define JC42_TEMP_MIN           0
 236#define JC42_TEMP_MAX           125000
 237
 238static u16 jc42_temp_to_reg(int temp, bool extended)
 239{
 240        int ntemp = SENSORS_LIMIT(temp,
 241                                  extended ? JC42_TEMP_MIN_EXTENDED :
 242                                  JC42_TEMP_MIN, JC42_TEMP_MAX);
 243
 244        /* convert from 0.001 to 0.0625 resolution */
 245        return (ntemp * 2 / 125) & 0x1fff;
 246}
 247
 248static int jc42_temp_from_reg(s16 reg)
 249{
 250        reg &= 0x1fff;
 251
 252        /* sign extend register */
 253        if (reg & 0x1000)
 254                reg |= 0xf000;
 255
 256        /* convert from 0.0625 to 0.001 resolution */
 257        return reg * 125 / 2;
 258}
 259
 260/* sysfs stuff */
 261
 262/* read routines for temperature limits */
 263#define show(value)     \
 264static ssize_t show_##value(struct device *dev,                         \
 265                            struct device_attribute *attr,              \
 266                            char *buf)                                  \
 267{                                                                       \
 268        struct jc42_data *data = jc42_update_device(dev);               \
 269        if (IS_ERR(data))                                               \
 270                return PTR_ERR(data);                                   \
 271        return sprintf(buf, "%d\n", jc42_temp_from_reg(data->value));   \
 272}
 273
 274show(temp_input);
 275show(temp_crit);
 276show(temp_min);
 277show(temp_max);
 278
 279/* read routines for hysteresis values */
 280static ssize_t show_temp_crit_hyst(struct device *dev,
 281                                   struct device_attribute *attr, char *buf)
 282{
 283        struct jc42_data *data = jc42_update_device(dev);
 284        int temp, hyst;
 285
 286        if (IS_ERR(data))
 287                return PTR_ERR(data);
 288
 289        temp = jc42_temp_from_reg(data->temp_crit);
 290        hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK)
 291                               >> JC42_CFG_HYST_SHIFT];
 292        return sprintf(buf, "%d\n", temp - hyst);
 293}
 294
 295static ssize_t show_temp_max_hyst(struct device *dev,
 296                                  struct device_attribute *attr, char *buf)
 297{
 298        struct jc42_data *data = jc42_update_device(dev);
 299        int temp, hyst;
 300
 301        if (IS_ERR(data))
 302                return PTR_ERR(data);
 303
 304        temp = jc42_temp_from_reg(data->temp_max);
 305        hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK)
 306                               >> JC42_CFG_HYST_SHIFT];
 307        return sprintf(buf, "%d\n", temp - hyst);
 308}
 309
 310/* write routines */
 311#define set(value, reg) \
 312static ssize_t set_##value(struct device *dev,                          \
 313                           struct device_attribute *attr,               \
 314                           const char *buf, size_t count)               \
 315{                                                                       \
 316        struct i2c_client *client = to_i2c_client(dev);                 \
 317        struct jc42_data *data = i2c_get_clientdata(client);            \
 318        int err, ret = count;                                           \
 319        long val;                                                       \
 320        if (kstrtol(buf, 10, &val) < 0)                         \
 321                return -EINVAL;                                         \
 322        mutex_lock(&data->update_lock);                                 \
 323        data->value = jc42_temp_to_reg(val, data->extended);            \
 324        err = i2c_smbus_write_word_swapped(client, reg, data->value);   \
 325        if (err < 0)                                                    \
 326                ret = err;                                              \
 327        mutex_unlock(&data->update_lock);                               \
 328        return ret;                                                     \
 329}
 330
 331set(temp_min, JC42_REG_TEMP_LOWER);
 332set(temp_max, JC42_REG_TEMP_UPPER);
 333set(temp_crit, JC42_REG_TEMP_CRITICAL);
 334
 335/*
 336 * JC42.4 compliant chips only support four hysteresis values.
 337 * Pick best choice and go from there.
 338 */
 339static ssize_t set_temp_crit_hyst(struct device *dev,
 340                                  struct device_attribute *attr,
 341                                  const char *buf, size_t count)
 342{
 343        struct i2c_client *client = to_i2c_client(dev);
 344        struct jc42_data *data = i2c_get_clientdata(client);
 345        unsigned long val;
 346        int diff, hyst;
 347        int err;
 348        int ret = count;
 349
 350        if (kstrtoul(buf, 10, &val) < 0)
 351                return -EINVAL;
 352
 353        diff = jc42_temp_from_reg(data->temp_crit) - val;
 354        hyst = 0;
 355        if (diff > 0) {
 356                if (diff < 2250)
 357                        hyst = 1;       /* 1.5 degrees C */
 358                else if (diff < 4500)
 359                        hyst = 2;       /* 3.0 degrees C */
 360                else
 361                        hyst = 3;       /* 6.0 degrees C */
 362        }
 363
 364        mutex_lock(&data->update_lock);
 365        data->config = (data->config & ~JC42_CFG_HYST_MASK)
 366          | (hyst << JC42_CFG_HYST_SHIFT);
 367        err = i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG,
 368                                           data->config);
 369        if (err < 0)
 370                ret = err;
 371        mutex_unlock(&data->update_lock);
 372        return ret;
 373}
 374
 375static ssize_t show_alarm(struct device *dev,
 376                          struct device_attribute *attr, char *buf)
 377{
 378        u16 bit = to_sensor_dev_attr(attr)->index;
 379        struct jc42_data *data = jc42_update_device(dev);
 380        u16 val;
 381
 382        if (IS_ERR(data))
 383                return PTR_ERR(data);
 384
 385        val = data->temp_input;
 386        if (bit != JC42_ALARM_CRIT_BIT && (data->config & JC42_CFG_CRIT_ONLY))
 387                val = 0;
 388        return sprintf(buf, "%u\n", (val >> bit) & 1);
 389}
 390
 391static DEVICE_ATTR(temp1_input, S_IRUGO,
 392                   show_temp_input, NULL);
 393static DEVICE_ATTR(temp1_crit, S_IRUGO,
 394                   show_temp_crit, set_temp_crit);
 395static DEVICE_ATTR(temp1_min, S_IRUGO,
 396                   show_temp_min, set_temp_min);
 397static DEVICE_ATTR(temp1_max, S_IRUGO,
 398                   show_temp_max, set_temp_max);
 399
 400static DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
 401                   show_temp_crit_hyst, set_temp_crit_hyst);
 402static DEVICE_ATTR(temp1_max_hyst, S_IRUGO,
 403                   show_temp_max_hyst, NULL);
 404
 405static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
 406                          JC42_ALARM_CRIT_BIT);
 407static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
 408                          JC42_ALARM_MIN_BIT);
 409static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
 410                          JC42_ALARM_MAX_BIT);
 411
 412static struct attribute *jc42_attributes[] = {
 413        &dev_attr_temp1_input.attr,
 414        &dev_attr_temp1_crit.attr,
 415        &dev_attr_temp1_min.attr,
 416        &dev_attr_temp1_max.attr,
 417        &dev_attr_temp1_crit_hyst.attr,
 418        &dev_attr_temp1_max_hyst.attr,
 419        &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 420        &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 421        &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 422        NULL
 423};
 424
 425static umode_t jc42_attribute_mode(struct kobject *kobj,
 426                                  struct attribute *attr, int index)
 427{
 428        struct device *dev = container_of(kobj, struct device, kobj);
 429        struct i2c_client *client = to_i2c_client(dev);
 430        struct jc42_data *data = i2c_get_clientdata(client);
 431        unsigned int config = data->config;
 432        bool readonly;
 433
 434        if (attr == &dev_attr_temp1_crit.attr)
 435                readonly = config & JC42_CFG_TCRIT_LOCK;
 436        else if (attr == &dev_attr_temp1_min.attr ||
 437                 attr == &dev_attr_temp1_max.attr)
 438                readonly = config & JC42_CFG_EVENT_LOCK;
 439        else if (attr == &dev_attr_temp1_crit_hyst.attr)
 440                readonly = config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK);
 441        else
 442                readonly = true;
 443
 444        return S_IRUGO | (readonly ? 0 : S_IWUSR);
 445}
 446
 447static const struct attribute_group jc42_group = {
 448        .attrs = jc42_attributes,
 449        .is_visible = jc42_attribute_mode,
 450};
 451
 452/* Return 0 if detection is successful, -ENODEV otherwise */
 453static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info)
 454{
 455        struct i2c_adapter *adapter = client->adapter;
 456        int i, config, cap, manid, devid;
 457
 458        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 459                                     I2C_FUNC_SMBUS_WORD_DATA))
 460                return -ENODEV;
 461
 462        cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP);
 463        config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
 464        manid = i2c_smbus_read_word_swapped(client, JC42_REG_MANID);
 465        devid = i2c_smbus_read_word_swapped(client, JC42_REG_DEVICEID);
 466
 467        if (cap < 0 || config < 0 || manid < 0 || devid < 0)
 468                return -ENODEV;
 469
 470        if ((cap & 0xff00) || (config & 0xf800))
 471                return -ENODEV;
 472
 473        for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) {
 474                struct jc42_chips *chip = &jc42_chips[i];
 475                if (manid == chip->manid &&
 476                    (devid & chip->devid_mask) == chip->devid) {
 477                        strlcpy(info->type, "jc42", I2C_NAME_SIZE);
 478                        return 0;
 479                }
 480        }
 481        return -ENODEV;
 482}
 483
 484static int jc42_probe(struct i2c_client *client, const struct i2c_device_id *id)
 485{
 486        struct jc42_data *data;
 487        int config, cap, err;
 488        struct device *dev = &client->dev;
 489
 490        data = devm_kzalloc(dev, sizeof(struct jc42_data), GFP_KERNEL);
 491        if (!data)
 492                return -ENOMEM;
 493
 494        i2c_set_clientdata(client, data);
 495        mutex_init(&data->update_lock);
 496
 497        cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP);
 498        if (cap < 0)
 499                return cap;
 500
 501        data->extended = !!(cap & JC42_CAP_RANGE);
 502
 503        config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
 504        if (config < 0)
 505                return config;
 506
 507        data->orig_config = config;
 508        if (config & JC42_CFG_SHUTDOWN) {
 509                config &= ~JC42_CFG_SHUTDOWN;
 510                i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
 511        }
 512        data->config = config;
 513
 514        /* Register sysfs hooks */
 515        err = sysfs_create_group(&dev->kobj, &jc42_group);
 516        if (err)
 517                return err;
 518
 519        data->hwmon_dev = hwmon_device_register(dev);
 520        if (IS_ERR(data->hwmon_dev)) {
 521                err = PTR_ERR(data->hwmon_dev);
 522                goto exit_remove;
 523        }
 524
 525        return 0;
 526
 527exit_remove:
 528        sysfs_remove_group(&dev->kobj, &jc42_group);
 529        return err;
 530}
 531
 532static int jc42_remove(struct i2c_client *client)
 533{
 534        struct jc42_data *data = i2c_get_clientdata(client);
 535        hwmon_device_unregister(data->hwmon_dev);
 536        sysfs_remove_group(&client->dev.kobj, &jc42_group);
 537
 538        /* Restore original configuration except hysteresis */
 539        if ((data->config & ~JC42_CFG_HYST_MASK) !=
 540            (data->orig_config & ~JC42_CFG_HYST_MASK)) {
 541                int config;
 542
 543                config = (data->orig_config & ~JC42_CFG_HYST_MASK)
 544                  | (data->config & JC42_CFG_HYST_MASK);
 545                i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
 546        }
 547        return 0;
 548}
 549
 550static struct jc42_data *jc42_update_device(struct device *dev)
 551{
 552        struct i2c_client *client = to_i2c_client(dev);
 553        struct jc42_data *data = i2c_get_clientdata(client);
 554        struct jc42_data *ret = data;
 555        int val;
 556
 557        mutex_lock(&data->update_lock);
 558
 559        if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 560                val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP);
 561                if (val < 0) {
 562                        ret = ERR_PTR(val);
 563                        goto abort;
 564                }
 565                data->temp_input = val;
 566
 567                val = i2c_smbus_read_word_swapped(client,
 568                                                  JC42_REG_TEMP_CRITICAL);
 569                if (val < 0) {
 570                        ret = ERR_PTR(val);
 571                        goto abort;
 572                }
 573                data->temp_crit = val;
 574
 575                val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP_LOWER);
 576                if (val < 0) {
 577                        ret = ERR_PTR(val);
 578                        goto abort;
 579                }
 580                data->temp_min = val;
 581
 582                val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP_UPPER);
 583                if (val < 0) {
 584                        ret = ERR_PTR(val);
 585                        goto abort;
 586                }
 587                data->temp_max = val;
 588
 589                data->last_updated = jiffies;
 590                data->valid = true;
 591        }
 592abort:
 593        mutex_unlock(&data->update_lock);
 594        return ret;
 595}
 596
 597module_i2c_driver(jc42_driver);
 598
 599MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 600MODULE_DESCRIPTION("JC42 driver");
 601MODULE_LICENSE("GPL");
 602
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