drivers/hwmon/jc42.c

   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 */
  36 static 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
 136 static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 };
 137
 138 struct jc42_chips {
 139         u16 manid;
 140         u16 devid;
 141         u16 devid_mask;
 142 };
 143
 144 static 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 */
 165 struct jc42_data {
 166         struct i2c_client *client;
 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
 179 #define JC42_TEMP_MIN_EXTENDED  (-40000)
 180 #define JC42_TEMP_MIN           0
 181 #define JC42_TEMP_MAX           125000
 182
 183 static u16 jc42_temp_to_reg(int temp, bool extended)
 184 {
 185         int ntemp = clamp_val(temp,
 186                               extended ? JC42_TEMP_MIN_EXTENDED :
 187                               JC42_TEMP_MIN, JC42_TEMP_MAX);
 188
 189         /* convert from 0.001 to 0.0625 resolution */
 190         return (ntemp * 2 / 125) & 0x1fff;
 191 }
 192
 193 static int jc42_temp_from_reg(s16 reg)
 194 {
 195         reg &= 0x1fff;
 196
 197         /* sign extend register */
 198         if (reg & 0x1000)
 199                 reg |= 0xf000;
 200
 201         /* convert from 0.0625 to 0.001 resolution */
 202         return reg * 125 / 2;
 203 }
 204
 205 static struct jc42_data *jc42_update_device(struct device *dev)
 206 {
 207         struct jc42_data *data = dev_get_drvdata(dev);
 208         struct i2c_client *client = data->client;
 209         struct jc42_data *ret = data;
 210         int val;
 211
 212         mutex_lock(&data->update_lock);
 213
 214         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 215                 val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP);
 216                 if (val < 0) {
 217                         ret = ERR_PTR(val);
 218                         goto abort;
 219                 }
 220                 data->temp_input = val;
 221
 222                 val = i2c_smbus_read_word_swapped(client,
 223                                                   JC42_REG_TEMP_CRITICAL);
 224                 if (val < 0) {
 225                         ret = ERR_PTR(val);
 226                         goto abort;
 227                 }
 228                 data->temp_crit = val;
 229
 230                 val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP_LOWER);
 231                 if (val < 0) {
 232                         ret = ERR_PTR(val);
 233                         goto abort;
 234                 }
 235                 data->temp_min = val;
 236
 237                 val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP_UPPER);
 238                 if (val < 0) {
 239                         ret = ERR_PTR(val);
 240                         goto abort;
 241                 }
 242                 data->temp_max = val;
 243
 244                 data->last_updated = jiffies;
 245                 data->valid = true;
 246         }
 247 abort:
 248         mutex_unlock(&data->update_lock);
 249         return ret;
 250 }
 251
 252 /* sysfs stuff */
 253
 254 /* read routines for temperature limits */
 255 #define show(value)     \
 256 static ssize_t show_##value(struct device *dev,                         \
 257                             struct device_attribute *attr,              \
 258                             char *buf)                                  \
 259 {                                                                       \
 260         struct jc42_data *data = jc42_update_device(dev);               \
 261         if (IS_ERR(data))                                               \
 262                 return PTR_ERR(data);                                   \
 263         return sprintf(buf, "%d\n", jc42_temp_from_reg(data->value));   \
 264 }
 265
 266 show(temp_input);
 267 show(temp_crit);
 268 show(temp_min);
 269 show(temp_max);
 270
 271 /* read routines for hysteresis values */
 272 static ssize_t show_temp_crit_hyst(struct device *dev,
 273                                    struct device_attribute *attr, char *buf)
 274 {
 275         struct jc42_data *data = jc42_update_device(dev);
 276         int temp, hyst;
 277
 278         if (IS_ERR(data))
 279                 return PTR_ERR(data);
 280
 281         temp = jc42_temp_from_reg(data->temp_crit);
 282         hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK)
 283                                >> JC42_CFG_HYST_SHIFT];
 284         return sprintf(buf, "%d\n", temp - hyst);
 285 }
 286
 287 static ssize_t show_temp_max_hyst(struct device *dev,
 288                                   struct device_attribute *attr, char *buf)
 289 {
 290         struct jc42_data *data = jc42_update_device(dev);
 291         int temp, hyst;
 292
 293         if (IS_ERR(data))
 294                 return PTR_ERR(data);
 295
 296         temp = jc42_temp_from_reg(data->temp_max);
 297         hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK)
 298                                >> JC42_CFG_HYST_SHIFT];
 299         return sprintf(buf, "%d\n", temp - hyst);
 300 }
 301
 302 /* write routines */
 303 #define set(value, reg) \
 304 static ssize_t set_##value(struct device *dev,                          \
 305                            struct device_attribute *attr,               \
 306                            const char *buf, size_t count)               \
 307 {                                                                       \
 308         struct jc42_data *data = dev_get_drvdata(dev);                  \
 309         int err, ret = count;                                           \
 310         long val;                                                       \
 311         if (kstrtol(buf, 10, &val) < 0)                                 \
 312                 return -EINVAL;                                         \
 313         mutex_lock(&data->update_lock);                                 \
 314         data->value = jc42_temp_to_reg(val, data->extended);            \
 315         err = i2c_smbus_write_word_swapped(data->client, reg, data->value); \
 316         if (err < 0)                                                    \
 317                 ret = err;                                              \
 318         mutex_unlock(&data->update_lock);                               \
 319         return ret;                                                     \
 320 }
 321
 322 set(temp_min, JC42_REG_TEMP_LOWER);
 323 set(temp_max, JC42_REG_TEMP_UPPER);
 324 set(temp_crit, JC42_REG_TEMP_CRITICAL);
 325
 326 /*
 327  * JC42.4 compliant chips only support four hysteresis values.
 328  * Pick best choice and go from there.
 329  */
 330 static ssize_t set_temp_crit_hyst(struct device *dev,
 331                                   struct device_attribute *attr,
 332                                   const char *buf, size_t count)
 333 {
 334         struct jc42_data *data = dev_get_drvdata(dev);
 335         unsigned long val;
 336         int diff, hyst;
 337         int err;
 338         int ret = count;
 339
 340         if (kstrtoul(buf, 10, &val) < 0)
 341                 return -EINVAL;
 342
 343         diff = jc42_temp_from_reg(data->temp_crit) - val;
 344         hyst = 0;
 345         if (diff > 0) {
 346                 if (diff < 2250)
 347                         hyst = 1;       /* 1.5 degrees C */
 348                 else if (diff < 4500)
 349                         hyst = 2;       /* 3.0 degrees C */
 350                 else
 351                         hyst = 3;       /* 6.0 degrees C */
 352         }
 353
 354         mutex_lock(&data->update_lock);
 355         data->config = (data->config & ~JC42_CFG_HYST_MASK)
 356           | (hyst << JC42_CFG_HYST_SHIFT);
 357         err = i2c_smbus_write_word_swapped(data->client, JC42_REG_CONFIG,
 358                                            data->config);
 359         if (err < 0)
 360                 ret = err;
 361         mutex_unlock(&data->update_lock);
 362         return ret;
 363 }
 364
 365 static ssize_t show_alarm(struct device *dev,
 366                           struct device_attribute *attr, char *buf)
 367 {
 368         u16 bit = to_sensor_dev_attr(attr)->index;
 369         struct jc42_data *data = jc42_update_device(dev);
 370         u16 val;
 371
 372         if (IS_ERR(data))
 373                 return PTR_ERR(data);
 374
 375         val = data->temp_input;
 376         if (bit != JC42_ALARM_CRIT_BIT && (data->config & JC42_CFG_CRIT_ONLY))
 377                 val = 0;
 378         return sprintf(buf, "%u\n", (val >> bit) & 1);
 379 }
 380
 381 static DEVICE_ATTR(temp1_input, S_IRUGO,
 382                    show_temp_input, NULL);
 383 static DEVICE_ATTR(temp1_crit, S_IRUGO,
 384                    show_temp_crit, set_temp_crit);
 385 static DEVICE_ATTR(temp1_min, S_IRUGO,
 386                    show_temp_min, set_temp_min);
 387 static DEVICE_ATTR(temp1_max, S_IRUGO,
 388                    show_temp_max, set_temp_max);
 389
 390 static DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
 391                    show_temp_crit_hyst, set_temp_crit_hyst);
 392 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO,
 393                    show_temp_max_hyst, NULL);
 394
 395 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
 396                           JC42_ALARM_CRIT_BIT);
 397 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
 398                           JC42_ALARM_MIN_BIT);
 399 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
 400                           JC42_ALARM_MAX_BIT);
 401
 402 static struct attribute *jc42_attributes[] = {
 403         &dev_attr_temp1_input.attr,
 404         &dev_attr_temp1_crit.attr,
 405         &dev_attr_temp1_min.attr,
 406         &dev_attr_temp1_max.attr,
 407         &dev_attr_temp1_crit_hyst.attr,
 408         &dev_attr_temp1_max_hyst.attr,
 409         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 410         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 411         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 412         NULL
 413 };
 414
 415 static umode_t jc42_attribute_mode(struct kobject *kobj,
 416                                   struct attribute *attr, int index)
 417 {
 418         struct device *dev = container_of(kobj, struct device, kobj);
 419         struct jc42_data *data = dev_get_drvdata(dev);
 420         unsigned int config = data->config;
 421         bool readonly;
 422
 423         if (attr == &dev_attr_temp1_crit.attr)
 424                 readonly = config & JC42_CFG_TCRIT_LOCK;
 425         else if (attr == &dev_attr_temp1_min.attr ||
 426                  attr == &dev_attr_temp1_max.attr)
 427                 readonly = config & JC42_CFG_EVENT_LOCK;
 428         else if (attr == &dev_attr_temp1_crit_hyst.attr)
 429                 readonly = config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK);
 430         else
 431                 readonly = true;
 432
 433         return S_IRUGO | (readonly ? 0 : S_IWUSR);
 434 }
 435
 436 static const struct attribute_group jc42_group = {
 437         .attrs = jc42_attributes,
 438         .is_visible = jc42_attribute_mode,
 439 };
 440 __ATTRIBUTE_GROUPS(jc42);
 441
 442 /* Return 0 if detection is successful, -ENODEV otherwise */
 443 static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info)
 444 {
 445         struct i2c_adapter *adapter = client->adapter;
 446         int i, config, cap, manid, devid;
 447
 448         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 449                                      I2C_FUNC_SMBUS_WORD_DATA))
 450                 return -ENODEV;
 451
 452         cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP);
 453         config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
 454         manid = i2c_smbus_read_word_swapped(client, JC42_REG_MANID);
 455         devid = i2c_smbus_read_word_swapped(client, JC42_REG_DEVICEID);
 456
 457         if (cap < 0 || config < 0 || manid < 0 || devid < 0)
 458                 return -ENODEV;
 459
 460         if ((cap & 0xff00) || (config & 0xf800))
 461                 return -ENODEV;
 462
 463         for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) {
 464                 struct jc42_chips *chip = &jc42_chips[i];
 465                 if (manid == chip->manid &&
 466                     (devid & chip->devid_mask) == chip->devid) {
 467                         strlcpy(info->type, "jc42", I2C_NAME_SIZE);
 468                         return 0;
 469                 }
 470         }
 471         return -ENODEV;
 472 }
 473
 474 static int jc42_probe(struct i2c_client *client, const struct i2c_device_id *id)
 475 {
 476         struct device *dev = &client->dev;
 477         struct device *hwmon_dev;
 478         struct jc42_data *data;
 479         int config, cap;
 480
 481         data = devm_kzalloc(dev, sizeof(struct jc42_data), GFP_KERNEL);
 482         if (!data)
 483                 return -ENOMEM;
 484
 485         data->client = client;
 486         i2c_set_clientdata(client, data);
 487         mutex_init(&data->update_lock);
 488
 489         cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP);
 490         if (cap < 0)
 491                 return cap;
 492
 493         data->extended = !!(cap & JC42_CAP_RANGE);
 494
 495         config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
 496         if (config < 0)
 497                 return config;
 498
 499         data->orig_config = config;
 500         if (config & JC42_CFG_SHUTDOWN) {
 501                 config &= ~JC42_CFG_SHUTDOWN;
 502                 i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
 503         }
 504         data->config = config;
 505
 506         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 507                                                            data,
 508                                                            jc42_groups);
 509         return PTR_ERR_OR_ZERO(hwmon_dev);
 510 }
 511
 512 static int jc42_remove(struct i2c_client *client)
 513 {
 514         struct jc42_data *data = i2c_get_clientdata(client);
 515
 516         /* Restore original configuration except hysteresis */
 517         if ((data->config & ~JC42_CFG_HYST_MASK) !=
 518             (data->orig_config & ~JC42_CFG_HYST_MASK)) {
 519                 int config;
 520
 521                 config = (data->orig_config & ~JC42_CFG_HYST_MASK)
 522                   | (data->config & JC42_CFG_HYST_MASK);
 523                 i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
 524         }
 525         return 0;
 526 }
 527
 528 #ifdef CONFIG_PM
 529
 530 static int jc42_suspend(struct device *dev)
 531 {
 532         struct jc42_data *data = dev_get_drvdata(dev);
 533
 534         data->config |= JC42_CFG_SHUTDOWN;
 535         i2c_smbus_write_word_swapped(data->client, JC42_REG_CONFIG,
 536                                      data->config);
 537         return 0;
 538 }
 539
 540 static int jc42_resume(struct device *dev)
 541 {
 542         struct jc42_data *data = dev_get_drvdata(dev);
 543
 544         data->config &= ~JC42_CFG_SHUTDOWN;
 545         i2c_smbus_write_word_swapped(data->client, JC42_REG_CONFIG,
 546                                      data->config);
 547         return 0;
 548 }
 549
 550 static const struct dev_pm_ops jc42_dev_pm_ops = {
 551         .suspend = jc42_suspend,
 552         .resume = jc42_resume,
 553 };
 554
 555 #define JC42_DEV_PM_OPS (&jc42_dev_pm_ops)
 556 #else
 557 #define JC42_DEV_PM_OPS NULL
 558 #endif /* CONFIG_PM */
 559
 560 static const struct i2c_device_id jc42_id[] = {
 561         { "jc42", 0 },
 562         { }
 563 };
 564 MODULE_DEVICE_TABLE(i2c, jc42_id);
 565
 566 static struct i2c_driver jc42_driver = {
 567         .class          = I2C_CLASS_SPD,
 568         .driver = {
 569                 .name   = "jc42",
 570                 .pm = JC42_DEV_PM_OPS,
 571         },
 572         .probe          = jc42_probe,
 573         .remove         = jc42_remove,
 574         .id_table       = jc42_id,
 575         .detect         = jc42_detect,
 576         .address_list   = normal_i2c,
 577 };
 578
 579 module_i2c_driver(jc42_driver);
 580
 581 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 582 MODULE_DESCRIPTION("JC42 driver");
 583 MODULE_LICENSE("GPL");