drivers/hwmon/pmbus/ibm-cffps.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2017 IBM Corp.
   4  */
   5
   6 #include <linux/bitfield.h>
   7 #include <linux/bitops.h>
   8 #include <linux/debugfs.h>
   9 #include <linux/device.h>
  10 #include <linux/fs.h>
  11 #include <linux/i2c.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/leds.h>
  14 #include <linux/module.h>
  15 #include <linux/mutex.h>
  16 #include <linux/of_device.h>
  17 #include <linux/pmbus.h>
  18
  19 #include "pmbus.h"
  20
  21 #define CFFPS_FRU_CMD                           0x9A
  22 #define CFFPS_PN_CMD                            0x9B
  23 #define CFFPS_HEADER_CMD                        0x9C
  24 #define CFFPS_SN_CMD                            0x9E
  25 #define CFFPS_MAX_POWER_OUT_CMD                 0xA7
  26 #define CFFPS_CCIN_CMD                          0xBD
  27 #define CFFPS_FW_CMD                            0xFA
  28 #define CFFPS1_FW_NUM_BYTES                     4
  29 #define CFFPS2_FW_NUM_WORDS                     3
  30 #define CFFPS_SYS_CONFIG_CMD                    0xDA
  31 #define CFFPS_12VCS_VOUT_CMD                    0xDE
  32
  33 #define CFFPS_INPUT_HISTORY_CMD                 0xD6
  34 #define CFFPS_INPUT_HISTORY_SIZE                100
  35
  36 #define CFFPS_CCIN_VERSION                      GENMASK(15, 8)
  37 #define CFFPS_CCIN_VERSION_1                     0x2b
  38 #define CFFPS_CCIN_VERSION_2                     0x2e
  39
  40 /* STATUS_MFR_SPECIFIC bits */
  41 #define CFFPS_MFR_FAN_FAULT                     BIT(0)
  42 #define CFFPS_MFR_THERMAL_FAULT                 BIT(1)
  43 #define CFFPS_MFR_OV_FAULT                      BIT(2)
  44 #define CFFPS_MFR_UV_FAULT                      BIT(3)
  45 #define CFFPS_MFR_PS_KILL                       BIT(4)
  46 #define CFFPS_MFR_OC_FAULT                      BIT(5)
  47 #define CFFPS_MFR_VAUX_FAULT                    BIT(6)
  48 #define CFFPS_MFR_CURRENT_SHARE_WARNING         BIT(7)
  49
  50 #define CFFPS_LED_BLINK                         BIT(0)
  51 #define CFFPS_LED_ON                            BIT(1)
  52 #define CFFPS_LED_OFF                           BIT(2)
  53 #define CFFPS_BLINK_RATE_MS                     250
  54
  55 enum {
  56         CFFPS_DEBUGFS_INPUT_HISTORY = 0,
  57         CFFPS_DEBUGFS_FRU,
  58         CFFPS_DEBUGFS_PN,
  59         CFFPS_DEBUGFS_HEADER,
  60         CFFPS_DEBUGFS_SN,
  61         CFFPS_DEBUGFS_MAX_POWER_OUT,
  62         CFFPS_DEBUGFS_CCIN,
  63         CFFPS_DEBUGFS_FW,
  64         CFFPS_DEBUGFS_ON_OFF_CONFIG,
  65         CFFPS_DEBUGFS_NUM_ENTRIES
  66 };
  67
  68 enum versions { cffps1, cffps2, cffps_unknown };
  69
  70 struct ibm_cffps_input_history {
  71         struct mutex update_lock;
  72         unsigned long last_update;
  73
  74         u8 byte_count;
  75         u8 data[CFFPS_INPUT_HISTORY_SIZE];
  76 };
  77
  78 struct ibm_cffps {
  79         enum versions version;
  80         struct i2c_client *client;
  81
  82         struct ibm_cffps_input_history input_history;
  83
  84         int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES];
  85
  86         char led_name[32];
  87         u8 led_state;
  88         struct led_classdev led;
  89 };
  90
  91 #define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)])
  92
  93 static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu,
  94                                             char __user *buf, size_t count,
  95                                             loff_t *ppos)
  96 {
  97         int rc;
  98         u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD };
  99         u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 };
 100         struct i2c_msg msg[2] = {
 101                 {
 102                         .addr = psu->client->addr,
 103                         .flags = psu->client->flags,
 104                         .len = 1,
 105                         .buf = msgbuf0,
 106                 }, {
 107                         .addr = psu->client->addr,
 108                         .flags = psu->client->flags | I2C_M_RD,
 109                         .len = CFFPS_INPUT_HISTORY_SIZE + 1,
 110                         .buf = msgbuf1,
 111                 },
 112         };
 113
 114         if (!*ppos) {
 115                 mutex_lock(&psu->input_history.update_lock);
 116                 if (time_after(jiffies, psu->input_history.last_update + HZ)) {
 117                         /*
 118                          * Use a raw i2c transfer, since we need more bytes
 119                          * than Linux I2C supports through smbus xfr (only 32).
 120                          */
 121                         rc = i2c_transfer(psu->client->adapter, msg, 2);
 122                         if (rc < 0) {
 123                                 mutex_unlock(&psu->input_history.update_lock);
 124                                 return rc;
 125                         }
 126
 127                         psu->input_history.byte_count = msgbuf1[0];
 128                         memcpy(psu->input_history.data, &msgbuf1[1],
 129                                CFFPS_INPUT_HISTORY_SIZE);
 130                         psu->input_history.last_update = jiffies;
 131                 }
 132
 133                 mutex_unlock(&psu->input_history.update_lock);
 134         }
 135
 136         return simple_read_from_buffer(buf, count, ppos,
 137                                        psu->input_history.data,
 138                                        psu->input_history.byte_count);
 139 }
 140
 141 static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
 142                                       size_t count, loff_t *ppos)
 143 {
 144         u8 cmd;
 145         int i, rc;
 146         int *idxp = file->private_data;
 147         int idx = *idxp;
 148         struct ibm_cffps *psu = to_psu(idxp, idx);
 149         char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
 150
 151         pmbus_set_page(psu->client, 0);
 152
 153         switch (idx) {
 154         case CFFPS_DEBUGFS_INPUT_HISTORY:
 155                 return ibm_cffps_read_input_history(psu, buf, count, ppos);
 156         case CFFPS_DEBUGFS_FRU:
 157                 cmd = CFFPS_FRU_CMD;
 158                 break;
 159         case CFFPS_DEBUGFS_PN:
 160                 cmd = CFFPS_PN_CMD;
 161                 break;
 162         case CFFPS_DEBUGFS_HEADER:
 163                 cmd = CFFPS_HEADER_CMD;
 164                 break;
 165         case CFFPS_DEBUGFS_SN:
 166                 cmd = CFFPS_SN_CMD;
 167                 break;
 168         case CFFPS_DEBUGFS_MAX_POWER_OUT:
 169                 rc = i2c_smbus_read_word_swapped(psu->client,
 170                                                  CFFPS_MAX_POWER_OUT_CMD);
 171                 if (rc < 0)
 172                         return rc;
 173
 174                 rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc);
 175                 goto done;
 176         case CFFPS_DEBUGFS_CCIN:
 177                 rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD);
 178                 if (rc < 0)
 179                         return rc;
 180
 181                 rc = snprintf(data, 5, "%04X", rc);
 182                 goto done;
 183         case CFFPS_DEBUGFS_FW:
 184                 switch (psu->version) {
 185                 case cffps1:
 186                         for (i = 0; i < CFFPS1_FW_NUM_BYTES; ++i) {
 187                                 rc = i2c_smbus_read_byte_data(psu->client,
 188                                                               CFFPS_FW_CMD +
 189                                                                 i);
 190                                 if (rc < 0)
 191                                         return rc;
 192
 193                                 snprintf(&data[i * 2], 3, "%02X", rc);
 194                         }
 195
 196                         rc = i * 2;
 197                         break;
 198                 case cffps2:
 199                         for (i = 0; i < CFFPS2_FW_NUM_WORDS; ++i) {
 200                                 rc = i2c_smbus_read_word_data(psu->client,
 201                                                               CFFPS_FW_CMD +
 202                                                                 i);
 203                                 if (rc < 0)
 204                                         return rc;
 205
 206                                 snprintf(&data[i * 4], 5, "%04X", rc);
 207                         }
 208
 209                         rc = i * 4;
 210                         break;
 211                 default:
 212                         return -EOPNOTSUPP;
 213                 }
 214                 goto done;
 215         case CFFPS_DEBUGFS_ON_OFF_CONFIG:
 216                 rc = i2c_smbus_read_byte_data(psu->client,
 217                                               PMBUS_ON_OFF_CONFIG);
 218                 if (rc < 0)
 219                         return rc;
 220
 221                 rc = snprintf(data, 3, "%02x", rc);
 222                 goto done;
 223         default:
 224                 return -EINVAL;
 225         }
 226
 227         rc = i2c_smbus_read_block_data(psu->client, cmd, data);
 228         if (rc < 0)
 229                 return rc;
 230
 231 done:
 232         data[rc] = '\n';
 233         rc += 2;
 234
 235         return simple_read_from_buffer(buf, count, ppos, data, rc);
 236 }
 237
 238 static ssize_t ibm_cffps_debugfs_write(struct file *file,
 239                                        const char __user *buf, size_t count,
 240                                        loff_t *ppos)
 241 {
 242         u8 data;
 243         ssize_t rc;
 244         int *idxp = file->private_data;
 245         int idx = *idxp;
 246         struct ibm_cffps *psu = to_psu(idxp, idx);
 247
 248         switch (idx) {
 249         case CFFPS_DEBUGFS_ON_OFF_CONFIG:
 250                 pmbus_set_page(psu->client, 0);
 251
 252                 rc = simple_write_to_buffer(&data, 1, ppos, buf, count);
 253                 if (rc <= 0)
 254                         return rc;
 255
 256                 rc = i2c_smbus_write_byte_data(psu->client,
 257                                                PMBUS_ON_OFF_CONFIG, data);
 258                 if (rc)
 259                         return rc;
 260
 261                 rc = 1;
 262                 break;
 263         default:
 264                 return -EINVAL;
 265         }
 266
 267         return rc;
 268 }
 269
 270 static const struct file_operations ibm_cffps_fops = {
 271         .llseek = noop_llseek,
 272         .read = ibm_cffps_debugfs_read,
 273         .write = ibm_cffps_debugfs_write,
 274         .open = simple_open,
 275 };
 276
 277 static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
 278                                     int reg)
 279 {
 280         int rc, mfr;
 281
 282         switch (reg) {
 283         case PMBUS_STATUS_VOUT:
 284         case PMBUS_STATUS_IOUT:
 285         case PMBUS_STATUS_TEMPERATURE:
 286         case PMBUS_STATUS_FAN_12:
 287                 rc = pmbus_read_byte_data(client, page, reg);
 288                 if (rc < 0)
 289                         return rc;
 290
 291                 mfr = pmbus_read_byte_data(client, page,
 292                                            PMBUS_STATUS_MFR_SPECIFIC);
 293                 if (mfr < 0)
 294                         /*
 295                          * Return the status register instead of an error,
 296                          * since we successfully read status.
 297                          */
 298                         return rc;
 299
 300                 /* Add MFR_SPECIFIC bits to the standard pmbus status regs. */
 301                 if (reg == PMBUS_STATUS_FAN_12) {
 302                         if (mfr & CFFPS_MFR_FAN_FAULT)
 303                                 rc |= PB_FAN_FAN1_FAULT;
 304                 } else if (reg == PMBUS_STATUS_TEMPERATURE) {
 305                         if (mfr & CFFPS_MFR_THERMAL_FAULT)
 306                                 rc |= PB_TEMP_OT_FAULT;
 307                 } else if (reg == PMBUS_STATUS_VOUT) {
 308                         if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))
 309                                 rc |= PB_VOLTAGE_OV_FAULT;
 310                         if (mfr & CFFPS_MFR_UV_FAULT)
 311                                 rc |= PB_VOLTAGE_UV_FAULT;
 312                 } else if (reg == PMBUS_STATUS_IOUT) {
 313                         if (mfr & CFFPS_MFR_OC_FAULT)
 314                                 rc |= PB_IOUT_OC_FAULT;
 315                         if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)
 316                                 rc |= PB_CURRENT_SHARE_FAULT;
 317                 }
 318                 break;
 319         default:
 320                 rc = -ENODATA;
 321                 break;
 322         }
 323
 324         return rc;
 325 }
 326
 327 static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
 328                                     int reg)
 329 {
 330         int rc, mfr;
 331
 332         switch (reg) {
 333         case PMBUS_STATUS_WORD:
 334                 rc = pmbus_read_word_data(client, page, reg);
 335                 if (rc < 0)
 336                         return rc;
 337
 338                 mfr = pmbus_read_byte_data(client, page,
 339                                            PMBUS_STATUS_MFR_SPECIFIC);
 340                 if (mfr < 0)
 341                         /*
 342                          * Return the status register instead of an error,
 343                          * since we successfully read status.
 344                          */
 345                         return rc;
 346
 347                 if (mfr & CFFPS_MFR_PS_KILL)
 348                         rc |= PB_STATUS_OFF;
 349                 break;
 350         case PMBUS_VIRT_READ_VMON:
 351                 rc = pmbus_read_word_data(client, page, CFFPS_12VCS_VOUT_CMD);
 352                 break;
 353         default:
 354                 rc = -ENODATA;
 355                 break;
 356         }
 357
 358         return rc;
 359 }
 360
 361 static int ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
 362                                         enum led_brightness brightness)
 363 {
 364         int rc;
 365         u8 next_led_state;
 366         struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
 367
 368         if (brightness == LED_OFF) {
 369                 next_led_state = CFFPS_LED_OFF;
 370         } else {
 371                 brightness = LED_FULL;
 372
 373                 if (psu->led_state != CFFPS_LED_BLINK)
 374                         next_led_state = CFFPS_LED_ON;
 375                 else
 376                         next_led_state = CFFPS_LED_BLINK;
 377         }
 378
 379         dev_dbg(&psu->client->dev, "LED brightness set: %d. Command: %d.\n",
 380                 brightness, next_led_state);
 381
 382         pmbus_set_page(psu->client, 0);
 383
 384         rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
 385                                        next_led_state);
 386         if (rc < 0)
 387                 return rc;
 388
 389         psu->led_state = next_led_state;
 390         led_cdev->brightness = brightness;
 391
 392         return 0;
 393 }
 394
 395 static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
 396                                    unsigned long *delay_on,
 397                                    unsigned long *delay_off)
 398 {
 399         int rc;
 400         struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
 401
 402         dev_dbg(&psu->client->dev, "LED blink set.\n");
 403
 404         pmbus_set_page(psu->client, 0);
 405
 406         rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
 407                                        CFFPS_LED_BLINK);
 408         if (rc < 0)
 409                 return rc;
 410
 411         psu->led_state = CFFPS_LED_BLINK;
 412         led_cdev->brightness = LED_FULL;
 413         *delay_on = CFFPS_BLINK_RATE_MS;
 414         *delay_off = CFFPS_BLINK_RATE_MS;
 415
 416         return 0;
 417 }
 418
 419 static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
 420 {
 421         int rc;
 422         struct i2c_client *client = psu->client;
 423         struct device *dev = &client->dev;
 424
 425         snprintf(psu->led_name, sizeof(psu->led_name), "%s-%02x", client->name,
 426                  client->addr);
 427         psu->led.name = psu->led_name;
 428         psu->led.max_brightness = LED_FULL;
 429         psu->led.brightness_set_blocking = ibm_cffps_led_brightness_set;
 430         psu->led.blink_set = ibm_cffps_led_blink_set;
 431
 432         rc = devm_led_classdev_register(dev, &psu->led);
 433         if (rc)
 434                 dev_warn(dev, "failed to register led class: %d\n", rc);
 435         else
 436                 i2c_smbus_write_byte_data(client, CFFPS_SYS_CONFIG_CMD,
 437                                           CFFPS_LED_OFF);
 438 }
 439
 440 static struct pmbus_driver_info ibm_cffps_info[] = {
 441         [cffps1] = {
 442                 .pages = 1,
 443                 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
 444                         PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
 445                         PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
 446                         PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
 447                         PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
 448                         PMBUS_HAVE_STATUS_FAN12,
 449                 .read_byte_data = ibm_cffps_read_byte_data,
 450                 .read_word_data = ibm_cffps_read_word_data,
 451         },
 452         [cffps2] = {
 453                 .pages = 2,
 454                 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
 455                         PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
 456                         PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
 457                         PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
 458                         PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
 459                         PMBUS_HAVE_STATUS_FAN12 | PMBUS_HAVE_VMON,
 460                 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
 461                         PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
 462                         PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT,
 463                 .read_byte_data = ibm_cffps_read_byte_data,
 464                 .read_word_data = ibm_cffps_read_word_data,
 465         },
 466 };
 467
 468 static struct pmbus_platform_data ibm_cffps_pdata = {
 469         .flags = PMBUS_SKIP_STATUS_CHECK,
 470 };
 471
 472 static int ibm_cffps_probe(struct i2c_client *client,
 473                            const struct i2c_device_id *id)
 474 {
 475         int i, rc;
 476         enum versions vs = cffps_unknown;
 477         struct dentry *debugfs;
 478         struct dentry *ibm_cffps_dir;
 479         struct ibm_cffps *psu;
 480         const void *md = of_device_get_match_data(&client->dev);
 481
 482         if (md)
 483                 vs = (enum versions)md;
 484         else if (id)
 485                 vs = (enum versions)id->driver_data;
 486
 487         if (vs == cffps_unknown) {
 488                 u16 ccin_version = CFFPS_CCIN_VERSION_1;
 489                 int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);
 490
 491                 if (ccin > 0)
 492                         ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
 493
 494                 switch (ccin_version) {
 495                 default:
 496                 case CFFPS_CCIN_VERSION_1:
 497                         vs = cffps1;
 498                         break;
 499                 case CFFPS_CCIN_VERSION_2:
 500                         vs = cffps2;
 501                         break;
 502                 }
 503
 504                 /* Set the client name to include the version number. */
 505                 snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);
 506         }
 507
 508         client->dev.platform_data = &ibm_cffps_pdata;
 509         rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs]);
 510         if (rc)
 511                 return rc;
 512
 513         /*
 514          * Don't fail the probe if there isn't enough memory for leds and
 515          * debugfs.
 516          */
 517         psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
 518         if (!psu)
 519                 return 0;
 520
 521         psu->version = vs;
 522         psu->client = client;
 523         mutex_init(&psu->input_history.update_lock);
 524         psu->input_history.last_update = jiffies - HZ;
 525
 526         ibm_cffps_create_led_class(psu);
 527
 528         /* Don't fail the probe if we can't create debugfs */
 529         debugfs = pmbus_get_debugfs_dir(client);
 530         if (!debugfs)
 531                 return 0;
 532
 533         ibm_cffps_dir = debugfs_create_dir(client->name, debugfs);
 534         if (!ibm_cffps_dir)
 535                 return 0;
 536
 537         for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i)
 538                 psu->debugfs_entries[i] = i;
 539
 540         debugfs_create_file("input_history", 0444, ibm_cffps_dir,
 541                             &psu->debugfs_entries[CFFPS_DEBUGFS_INPUT_HISTORY],
 542                             &ibm_cffps_fops);
 543         debugfs_create_file("fru", 0444, ibm_cffps_dir,
 544                             &psu->debugfs_entries[CFFPS_DEBUGFS_FRU],
 545                             &ibm_cffps_fops);
 546         debugfs_create_file("part_number", 0444, ibm_cffps_dir,
 547                             &psu->debugfs_entries[CFFPS_DEBUGFS_PN],
 548                             &ibm_cffps_fops);
 549         debugfs_create_file("header", 0444, ibm_cffps_dir,
 550                             &psu->debugfs_entries[CFFPS_DEBUGFS_HEADER],
 551                             &ibm_cffps_fops);
 552         debugfs_create_file("serial_number", 0444, ibm_cffps_dir,
 553                             &psu->debugfs_entries[CFFPS_DEBUGFS_SN],
 554                             &ibm_cffps_fops);
 555         debugfs_create_file("max_power_out", 0444, ibm_cffps_dir,
 556                             &psu->debugfs_entries[CFFPS_DEBUGFS_MAX_POWER_OUT],
 557                             &ibm_cffps_fops);
 558         debugfs_create_file("ccin", 0444, ibm_cffps_dir,
 559                             &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],
 560                             &ibm_cffps_fops);
 561         debugfs_create_file("fw_version", 0444, ibm_cffps_dir,
 562                             &psu->debugfs_entries[CFFPS_DEBUGFS_FW],
 563                             &ibm_cffps_fops);
 564         debugfs_create_file("on_off_config", 0644, ibm_cffps_dir,
 565                             &psu->debugfs_entries[CFFPS_DEBUGFS_ON_OFF_CONFIG],
 566                             &ibm_cffps_fops);
 567
 568         return 0;
 569 }
 570
 571 static const struct i2c_device_id ibm_cffps_id[] = {
 572         { "ibm_cffps1", cffps1 },
 573         { "ibm_cffps2", cffps2 },
 574         { "ibm_cffps", cffps_unknown },
 575         {}
 576 };
 577 MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
 578
 579 static const struct of_device_id ibm_cffps_of_match[] = {
 580         {
 581                 .compatible = "ibm,cffps1",
 582                 .data = (void *)cffps1
 583         },
 584         {
 585                 .compatible = "ibm,cffps2",
 586                 .data = (void *)cffps2
 587         },
 588         {
 589                 .compatible = "ibm,cffps",
 590                 .data = (void *)cffps_unknown
 591         },
 592         {}
 593 };
 594 MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
 595
 596 static struct i2c_driver ibm_cffps_driver = {
 597         .driver = {
 598                 .name = "ibm-cffps",
 599                 .of_match_table = ibm_cffps_of_match,
 600         },
 601         .probe = ibm_cffps_probe,
 602         .remove = pmbus_do_remove,
 603         .id_table = ibm_cffps_id,
 604 };
 605
 606 module_i2c_driver(ibm_cffps_driver);
 607
 608 MODULE_AUTHOR("Eddie James");
 609 MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");
 610 MODULE_LICENSE("GPL");