drivers/hwmon/pmbus/ucd9000.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for UCD90xxx Sequencer and System Health
   4  * Controller series
   5  *
   6  * Copyright (C) 2011 Ericsson AB.
   7  */
   8
   9 #include <linux/debugfs.h>
  10 #include <linux/delay.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/init.h>
  15 #include <linux/err.h>
  16 #include <linux/slab.h>
  17 #include <linux/i2c.h>
  18 #include <linux/pmbus.h>
  19 #include <linux/gpio/driver.h>
  20 #include <linux/timekeeping.h>
  21 #include "pmbus.h"
  22
  23 enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd90320, ucd9090,
  24              ucd90910 };
  25
  26 #define UCD9000_MONITOR_CONFIG          0xd5
  27 #define UCD9000_NUM_PAGES               0xd6
  28 #define UCD9000_FAN_CONFIG_INDEX        0xe7
  29 #define UCD9000_FAN_CONFIG              0xe8
  30 #define UCD9000_MFR_STATUS              0xf3
  31 #define UCD9000_GPIO_SELECT             0xfa
  32 #define UCD9000_GPIO_CONFIG             0xfb
  33 #define UCD9000_DEVICE_ID               0xfd
  34
  35 /* GPIO CONFIG bits */
  36 #define UCD9000_GPIO_CONFIG_ENABLE      BIT(0)
  37 #define UCD9000_GPIO_CONFIG_OUT_ENABLE  BIT(1)
  38 #define UCD9000_GPIO_CONFIG_OUT_VALUE   BIT(2)
  39 #define UCD9000_GPIO_CONFIG_STATUS      BIT(3)
  40 #define UCD9000_GPIO_INPUT              0
  41 #define UCD9000_GPIO_OUTPUT             1
  42
  43 #define UCD9000_MON_TYPE(x)     (((x) >> 5) & 0x07)
  44 #define UCD9000_MON_PAGE(x)     ((x) & 0x1f)
  45
  46 #define UCD9000_MON_VOLTAGE     1
  47 #define UCD9000_MON_TEMPERATURE 2
  48 #define UCD9000_MON_CURRENT     3
  49 #define UCD9000_MON_VOLTAGE_HW  4
  50
  51 #define UCD9000_NUM_FAN         4
  52
  53 #define UCD9000_GPIO_NAME_LEN   16
  54 #define UCD9090_NUM_GPIOS       23
  55 #define UCD901XX_NUM_GPIOS      26
  56 #define UCD90320_NUM_GPIOS      84
  57 #define UCD90910_NUM_GPIOS      26
  58
  59 #define UCD9000_DEBUGFS_NAME_LEN        24
  60 #define UCD9000_GPI_COUNT               8
  61 #define UCD90320_GPI_COUNT              32
  62
  63 struct ucd9000_data {
  64         u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
  65         struct pmbus_driver_info info;
  66 #ifdef CONFIG_GPIOLIB
  67         struct gpio_chip gpio;
  68 #endif
  69         struct dentry *debugfs;
  70 };
  71 #define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
  72
  73 struct ucd9000_debugfs_entry {
  74         struct i2c_client *client;
  75         u8 index;
  76 };
  77
  78 /*
  79  * It has been observed that the UCD90320 randomly fails register access when
  80  * doing another access right on the back of a register write. To mitigate this
  81  * make sure that there is a minimum delay between a write access and the
  82  * following access. The 500 is based on experimental data. At a delay of
  83  * 350us the issue seems to go away. Add a bit of extra margin to allow for
  84  * system to system differences.
  85  */
  86 #define UCD90320_WAIT_DELAY_US 500
  87
  88 static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
  89 {
  90         int fan_config = 0;
  91         struct ucd9000_data *data
  92           = to_ucd9000_data(pmbus_get_driver_info(client));
  93
  94         if (data->fan_data[fan][3] & 1)
  95                 fan_config |= PB_FAN_2_INSTALLED;   /* Use lower bit position */
  96
  97         /* Pulses/revolution */
  98         fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;
  99
 100         return fan_config;
 101 }
 102
 103 static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
 104 {
 105         int ret = 0;
 106         int fan_config;
 107
 108         switch (reg) {
 109         case PMBUS_FAN_CONFIG_12:
 110                 if (page > 0)
 111                         return -ENXIO;
 112
 113                 ret = ucd9000_get_fan_config(client, 0);
 114                 if (ret < 0)
 115                         return ret;
 116                 fan_config = ret << 4;
 117                 ret = ucd9000_get_fan_config(client, 1);
 118                 if (ret < 0)
 119                         return ret;
 120                 fan_config |= ret;
 121                 ret = fan_config;
 122                 break;
 123         case PMBUS_FAN_CONFIG_34:
 124                 if (page > 0)
 125                         return -ENXIO;
 126
 127                 ret = ucd9000_get_fan_config(client, 2);
 128                 if (ret < 0)
 129                         return ret;
 130                 fan_config = ret << 4;
 131                 ret = ucd9000_get_fan_config(client, 3);
 132                 if (ret < 0)
 133                         return ret;
 134                 fan_config |= ret;
 135                 ret = fan_config;
 136                 break;
 137         default:
 138                 ret = -ENODATA;
 139                 break;
 140         }
 141         return ret;
 142 }
 143
 144 static const struct i2c_device_id ucd9000_id[] = {
 145         {"ucd9000", ucd9000},
 146         {"ucd90120", ucd90120},
 147         {"ucd90124", ucd90124},
 148         {"ucd90160", ucd90160},
 149         {"ucd90320", ucd90320},
 150         {"ucd9090", ucd9090},
 151         {"ucd90910", ucd90910},
 152         {}
 153 };
 154 MODULE_DEVICE_TABLE(i2c, ucd9000_id);
 155
 156 static const struct of_device_id __maybe_unused ucd9000_of_match[] = {
 157         {
 158                 .compatible = "ti,ucd9000",
 159                 .data = (void *)ucd9000
 160         },
 161         {
 162                 .compatible = "ti,ucd90120",
 163                 .data = (void *)ucd90120
 164         },
 165         {
 166                 .compatible = "ti,ucd90124",
 167                 .data = (void *)ucd90124
 168         },
 169         {
 170                 .compatible = "ti,ucd90160",
 171                 .data = (void *)ucd90160
 172         },
 173         {
 174                 .compatible = "ti,ucd90320",
 175                 .data = (void *)ucd90320
 176         },
 177         {
 178                 .compatible = "ti,ucd9090",
 179                 .data = (void *)ucd9090
 180         },
 181         {
 182                 .compatible = "ti,ucd90910",
 183                 .data = (void *)ucd90910
 184         },
 185         { },
 186 };
 187 MODULE_DEVICE_TABLE(of, ucd9000_of_match);
 188
 189 #ifdef CONFIG_GPIOLIB
 190 static int ucd9000_gpio_read_config(struct i2c_client *client,
 191                                     unsigned int offset)
 192 {
 193         int ret;
 194
 195         /* No page set required */
 196         ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
 197         if (ret < 0)
 198                 return ret;
 199
 200         return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
 201 }
 202
 203 static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
 204 {
 205         struct i2c_client *client  = gpiochip_get_data(gc);
 206         int ret;
 207
 208         ret = ucd9000_gpio_read_config(client, offset);
 209         if (ret < 0)
 210                 return ret;
 211
 212         return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
 213 }
 214
 215 static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
 216                              int value)
 217 {
 218         struct i2c_client *client = gpiochip_get_data(gc);
 219         int ret;
 220
 221         ret = ucd9000_gpio_read_config(client, offset);
 222         if (ret < 0) {
 223                 dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
 224                         offset, ret);
 225                 return;
 226         }
 227
 228         if (value) {
 229                 if (ret & UCD9000_GPIO_CONFIG_STATUS)
 230                         return;
 231
 232                 ret |= UCD9000_GPIO_CONFIG_STATUS;
 233         } else {
 234                 if (!(ret & UCD9000_GPIO_CONFIG_STATUS))
 235                         return;
 236
 237                 ret &= ~UCD9000_GPIO_CONFIG_STATUS;
 238         }
 239
 240         ret |= UCD9000_GPIO_CONFIG_ENABLE;
 241
 242         /* Page set not required */
 243         ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
 244         if (ret < 0) {
 245                 dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
 246                         offset, ret);
 247                 return;
 248         }
 249
 250         ret &= ~UCD9000_GPIO_CONFIG_ENABLE;
 251
 252         ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
 253         if (ret < 0)
 254                 dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
 255                         offset, ret);
 256 }
 257
 258 static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
 259                                       unsigned int offset)
 260 {
 261         struct i2c_client *client = gpiochip_get_data(gc);
 262         int ret;
 263
 264         ret = ucd9000_gpio_read_config(client, offset);
 265         if (ret < 0)
 266                 return ret;
 267
 268         return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
 269 }
 270
 271 static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
 272                                       unsigned int offset, bool direction_out,
 273                                       int requested_out)
 274 {
 275         struct i2c_client *client = gpiochip_get_data(gc);
 276         int ret, config, out_val;
 277
 278         ret = ucd9000_gpio_read_config(client, offset);
 279         if (ret < 0)
 280                 return ret;
 281
 282         if (direction_out) {
 283                 out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;
 284
 285                 if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
 286                         if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
 287                                 return 0;
 288                 } else {
 289                         ret |= UCD9000_GPIO_CONFIG_OUT_ENABLE;
 290                 }
 291
 292                 if (out_val)
 293                         ret |= UCD9000_GPIO_CONFIG_OUT_VALUE;
 294                 else
 295                         ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;
 296
 297         } else {
 298                 if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
 299                         return 0;
 300
 301                 ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
 302         }
 303
 304         ret |= UCD9000_GPIO_CONFIG_ENABLE;
 305         config = ret;
 306
 307         /* Page set not required */
 308         ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
 309         if (ret < 0)
 310                 return ret;
 311
 312         config &= ~UCD9000_GPIO_CONFIG_ENABLE;
 313
 314         return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
 315 }
 316
 317 static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
 318                                         unsigned int offset)
 319 {
 320         return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
 321 }
 322
 323 static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
 324                                          unsigned int offset, int val)
 325 {
 326         return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
 327                                           val);
 328 }
 329
 330 static void ucd9000_probe_gpio(struct i2c_client *client,
 331                                const struct i2c_device_id *mid,
 332                                struct ucd9000_data *data)
 333 {
 334         int rc;
 335
 336         switch (mid->driver_data) {
 337         case ucd9090:
 338                 data->gpio.ngpio = UCD9090_NUM_GPIOS;
 339                 break;
 340         case ucd90120:
 341         case ucd90124:
 342         case ucd90160:
 343                 data->gpio.ngpio = UCD901XX_NUM_GPIOS;
 344                 break;
 345         case ucd90320:
 346                 data->gpio.ngpio = UCD90320_NUM_GPIOS;
 347                 break;
 348         case ucd90910:
 349                 data->gpio.ngpio = UCD90910_NUM_GPIOS;
 350                 break;
 351         default:
 352                 return; /* GPIO support is optional. */
 353         }
 354
 355         /*
 356          * Pinmux support has not been added to the new gpio_chip.
 357          * This support should be added when possible given the mux
 358          * behavior of these IO devices.
 359          */
 360         data->gpio.label = client->name;
 361         data->gpio.get_direction = ucd9000_gpio_get_direction;
 362         data->gpio.direction_input = ucd9000_gpio_direction_input;
 363         data->gpio.direction_output = ucd9000_gpio_direction_output;
 364         data->gpio.get = ucd9000_gpio_get;
 365         data->gpio.set = ucd9000_gpio_set;
 366         data->gpio.can_sleep = true;
 367         data->gpio.base = -1;
 368         data->gpio.parent = &client->dev;
 369
 370         rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client);
 371         if (rc)
 372                 dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc);
 373 }
 374 #else
 375 static void ucd9000_probe_gpio(struct i2c_client *client,
 376                                const struct i2c_device_id *mid,
 377                                struct ucd9000_data *data)
 378 {
 379 }
 380 #endif /* CONFIG_GPIOLIB */
 381
 382 #ifdef CONFIG_DEBUG_FS
 383 static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
 384 {
 385         int ret = pmbus_set_page(client, 0, 0xff);
 386
 387         if (ret < 0)
 388                 return ret;
 389
 390         return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
 391 }
 392
 393 static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
 394 {
 395         struct ucd9000_debugfs_entry *entry = data;
 396         struct i2c_client *client = entry->client;
 397         u8 buffer[I2C_SMBUS_BLOCK_MAX];
 398         int ret, i;
 399
 400         ret = ucd9000_get_mfr_status(client, buffer);
 401         if (ret < 0)
 402                 return ret;
 403
 404         /*
 405          * GPI fault bits are in sets of 8, two bytes from end of response.
 406          */
 407         i = ret - 3 - entry->index / 8;
 408         if (i >= 0)
 409                 *val = !!(buffer[i] & BIT(entry->index % 8));
 410
 411         return 0;
 412 }
 413 DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
 414                          ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
 415
 416 static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
 417                                                char __user *buf, size_t count,
 418                                                loff_t *ppos)
 419 {
 420         struct i2c_client *client = file->private_data;
 421         u8 buffer[I2C_SMBUS_BLOCK_MAX];
 422         char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
 423         char *res;
 424         int rc;
 425
 426         rc = ucd9000_get_mfr_status(client, buffer);
 427         if (rc < 0)
 428                 return rc;
 429
 430         res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
 431         *res++ = '\n';
 432         *res = 0;
 433
 434         return simple_read_from_buffer(buf, count, ppos, str, res - str);
 435 }
 436
 437 static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
 438         .llseek = noop_llseek,
 439         .read = ucd9000_debugfs_read_mfr_status,
 440         .open = simple_open,
 441 };
 442
 443 static int ucd9000_init_debugfs(struct i2c_client *client,
 444                                 const struct i2c_device_id *mid,
 445                                 struct ucd9000_data *data)
 446 {
 447         struct dentry *debugfs;
 448         struct ucd9000_debugfs_entry *entries;
 449         int i, gpi_count;
 450         char name[UCD9000_DEBUGFS_NAME_LEN];
 451
 452         debugfs = pmbus_get_debugfs_dir(client);
 453         if (!debugfs)
 454                 return -ENOENT;
 455
 456         data->debugfs = debugfs_create_dir(client->name, debugfs);
 457
 458         /*
 459          * Of the chips this driver supports, only the UCD9090, UCD90160,
 460          * UCD90320, and UCD90910 report GPI faults in their MFR_STATUS
 461          * register, so only create the GPI fault debugfs attributes for those
 462          * chips.
 463          */
 464         if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
 465             mid->driver_data == ucd90320 || mid->driver_data == ucd90910) {
 466                 gpi_count = mid->driver_data == ucd90320 ? UCD90320_GPI_COUNT
 467                                                          : UCD9000_GPI_COUNT;
 468                 entries = devm_kcalloc(&client->dev,
 469                                        gpi_count, sizeof(*entries),
 470                                        GFP_KERNEL);
 471                 if (!entries)
 472                         return -ENOMEM;
 473
 474                 for (i = 0; i < gpi_count; i++) {
 475                         entries[i].client = client;
 476                         entries[i].index = i;
 477                         scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
 478                                   "gpi%d_alarm", i + 1);
 479                         debugfs_create_file(name, 0444, data->debugfs,
 480                                             &entries[i],
 481                                             &ucd9000_debugfs_mfr_status_bit);
 482                 }
 483         }
 484
 485         scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
 486         debugfs_create_file(name, 0444, data->debugfs, client,
 487                             &ucd9000_debugfs_show_mfr_status_fops);
 488
 489         return 0;
 490 }
 491 #else
 492 static int ucd9000_init_debugfs(struct i2c_client *client,
 493                                 const struct i2c_device_id *mid,
 494                                 struct ucd9000_data *data)
 495 {
 496         return 0;
 497 }
 498 #endif /* CONFIG_DEBUG_FS */
 499
 500 static int ucd9000_probe(struct i2c_client *client)
 501 {
 502         u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
 503         struct ucd9000_data *data;
 504         struct pmbus_driver_info *info;
 505         const struct i2c_device_id *mid;
 506         enum chips chip;
 507         int i, ret;
 508
 509         if (!i2c_check_functionality(client->adapter,
 510                                      I2C_FUNC_SMBUS_BYTE_DATA |
 511                                      I2C_FUNC_SMBUS_BLOCK_DATA))
 512                 return -ENODEV;
 513
 514         ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
 515                                         block_buffer);
 516         if (ret < 0) {
 517                 dev_err(&client->dev, "Failed to read device ID\n");
 518                 return ret;
 519         }
 520         block_buffer[ret] = '\0';
 521         dev_info(&client->dev, "Device ID %s\n", block_buffer);
 522
 523         for (mid = ucd9000_id; mid->name[0]; mid++) {
 524                 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
 525                         break;
 526         }
 527         if (!mid->name[0]) {
 528                 dev_err(&client->dev, "Unsupported device\n");
 529                 return -ENODEV;
 530         }
 531
 532         if (client->dev.of_node)
 533                 chip = (uintptr_t)of_device_get_match_data(&client->dev);
 534         else
 535                 chip = mid->driver_data;
 536
 537         if (chip != ucd9000 && strcmp(client->name, mid->name) != 0)
 538                 dev_notice(&client->dev,
 539                            "Device mismatch: Configured %s, detected %s\n",
 540                            client->name, mid->name);
 541
 542         data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
 543                             GFP_KERNEL);
 544         if (!data)
 545                 return -ENOMEM;
 546         info = &data->info;
 547
 548         ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
 549         if (ret < 0) {
 550                 dev_err(&client->dev,
 551                         "Failed to read number of active pages\n");
 552                 return ret;
 553         }
 554         info->pages = ret;
 555         if (!info->pages) {
 556                 dev_err(&client->dev, "No pages configured\n");
 557                 return -ENODEV;
 558         }
 559
 560         /* The internal temperature sensor is always active */
 561         info->func[0] = PMBUS_HAVE_TEMP;
 562
 563         /* Everything else is configurable */
 564         ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
 565                                         block_buffer);
 566         if (ret <= 0) {
 567                 dev_err(&client->dev, "Failed to read configuration data\n");
 568                 return -ENODEV;
 569         }
 570         for (i = 0; i < ret; i++) {
 571                 int page = UCD9000_MON_PAGE(block_buffer[i]);
 572
 573                 if (page >= info->pages)
 574                         continue;
 575
 576                 switch (UCD9000_MON_TYPE(block_buffer[i])) {
 577                 case UCD9000_MON_VOLTAGE:
 578                 case UCD9000_MON_VOLTAGE_HW:
 579                         info->func[page] |= PMBUS_HAVE_VOUT
 580                           | PMBUS_HAVE_STATUS_VOUT;
 581                         break;
 582                 case UCD9000_MON_TEMPERATURE:
 583                         info->func[page] |= PMBUS_HAVE_TEMP2
 584                           | PMBUS_HAVE_STATUS_TEMP;
 585                         break;
 586                 case UCD9000_MON_CURRENT:
 587                         info->func[page] |= PMBUS_HAVE_IOUT
 588                           | PMBUS_HAVE_STATUS_IOUT;
 589                         break;
 590                 default:
 591                         break;
 592                 }
 593         }
 594
 595         /* Fan configuration */
 596         if (mid->driver_data == ucd90124) {
 597                 for (i = 0; i < UCD9000_NUM_FAN; i++) {
 598                         i2c_smbus_write_byte_data(client,
 599                                                   UCD9000_FAN_CONFIG_INDEX, i);
 600                         ret = i2c_smbus_read_block_data(client,
 601                                                         UCD9000_FAN_CONFIG,
 602                                                         data->fan_data[i]);
 603                         if (ret < 0)
 604                                 return ret;
 605                 }
 606                 i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
 607
 608                 info->read_byte_data = ucd9000_read_byte_data;
 609                 info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
 610                   | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
 611         } else if (mid->driver_data == ucd90320) {
 612                 /* Delay SMBus operations after a write */
 613                 info->write_delay = UCD90320_WAIT_DELAY_US;
 614         }
 615
 616         ucd9000_probe_gpio(client, mid, data);
 617
 618         ret = pmbus_do_probe(client, info);
 619         if (ret)
 620                 return ret;
 621
 622         ret = ucd9000_init_debugfs(client, mid, data);
 623         if (ret)
 624                 dev_warn(&client->dev, "Failed to register debugfs: %d\n",
 625                          ret);
 626
 627         return 0;
 628 }
 629
 630 /* This is the driver that will be inserted */
 631 static struct i2c_driver ucd9000_driver = {
 632         .driver = {
 633                 .name = "ucd9000",
 634                 .of_match_table = of_match_ptr(ucd9000_of_match),
 635         },
 636         .probe = ucd9000_probe,
 637         .id_table = ucd9000_id,
 638 };
 639
 640 module_i2c_driver(ucd9000_driver);
 641
 642 MODULE_AUTHOR("Guenter Roeck");
 643 MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
 644 MODULE_LICENSE("GPL");
 645 MODULE_IMPORT_NS("PMBUS");