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_REVISION                     GENMASK(7, 0)
  37 #define  CFFPS_CCIN_REVISION_LEGACY              0xde
  38 #define CFFPS_CCIN_VERSION                      GENMASK(15, 8)
  39 #define CFFPS_CCIN_VERSION_1                     0x2b
  40 #define CFFPS_CCIN_VERSION_2                     0x2e
  41 #define CFFPS_CCIN_VERSION_3                     0x51
  42
  43 /* STATUS_MFR_SPECIFIC bits */
  44 #define CFFPS_MFR_FAN_FAULT                     BIT(0)
  45 #define CFFPS_MFR_THERMAL_FAULT                 BIT(1)
  46 #define CFFPS_MFR_OV_FAULT                      BIT(2)
  47 #define CFFPS_MFR_UV_FAULT                      BIT(3)
  48 #define CFFPS_MFR_PS_KILL                       BIT(4)
  49 #define CFFPS_MFR_OC_FAULT                      BIT(5)
  50 #define CFFPS_MFR_VAUX_FAULT                    BIT(6)
  51 #define CFFPS_MFR_CURRENT_SHARE_WARNING         BIT(7)
  52
  53 #define CFFPS_LED_BLINK                         BIT(0)
  54 #define CFFPS_LED_ON                            BIT(1)
  55 #define CFFPS_LED_OFF                           BIT(2)
  56 #define CFFPS_BLINK_RATE_MS                     250
  57
  58 enum {
  59         CFFPS_DEBUGFS_INPUT_HISTORY = 0,
  60         CFFPS_DEBUGFS_FRU,
  61         CFFPS_DEBUGFS_PN,
  62         CFFPS_DEBUGFS_HEADER,
  63         CFFPS_DEBUGFS_SN,
  64         CFFPS_DEBUGFS_MAX_POWER_OUT,
  65         CFFPS_DEBUGFS_CCIN,
  66         CFFPS_DEBUGFS_FW,
  67         CFFPS_DEBUGFS_ON_OFF_CONFIG,
  68         CFFPS_DEBUGFS_NUM_ENTRIES
  69 };
  70
  71 enum versions { cffps1, cffps2, cffps_unknown };
  72
  73 struct ibm_cffps_input_history {
  74         struct mutex update_lock;
  75         unsigned long last_update;
  76
  77         u8 byte_count;
  78         u8 data[CFFPS_INPUT_HISTORY_SIZE];
  79 };
  80
  81 struct ibm_cffps {
  82         enum versions version;
  83         struct i2c_client *client;
  84
  85         struct ibm_cffps_input_history input_history;
  86
  87         int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES];
  88
  89         char led_name[32];
  90         u8 led_state;
  91         struct led_classdev led;
  92 };
  93
  94 static const struct i2c_device_id ibm_cffps_id[];
  95
  96 #define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)])
  97
  98 static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu,
  99                                             char __user *buf, size_t count,
 100                                             loff_t *ppos)
 101 {
 102         int rc;
 103         u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD };
 104         u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 };
 105         struct i2c_msg msg[2] = {
 106                 {
 107                         .addr = psu->client->addr,
 108                         .flags = psu->client->flags,
 109                         .len = 1,
 110                         .buf = msgbuf0,
 111                 }, {
 112                         .addr = psu->client->addr,
 113                         .flags = psu->client->flags | I2C_M_RD,
 114                         .len = CFFPS_INPUT_HISTORY_SIZE + 1,
 115                         .buf = msgbuf1,
 116                 },
 117         };
 118
 119         if (!*ppos) {
 120                 mutex_lock(&psu->input_history.update_lock);
 121                 if (time_after(jiffies, psu->input_history.last_update + HZ)) {
 122                         /*
 123                          * Use a raw i2c transfer, since we need more bytes
 124                          * than Linux I2C supports through smbus xfr (only 32).
 125                          */
 126                         rc = i2c_transfer(psu->client->adapter, msg, 2);
 127                         if (rc < 0) {
 128                                 mutex_unlock(&psu->input_history.update_lock);
 129                                 return rc;
 130                         }
 131
 132                         psu->input_history.byte_count = msgbuf1[0];
 133                         memcpy(psu->input_history.data, &msgbuf1[1],
 134                                CFFPS_INPUT_HISTORY_SIZE);
 135                         psu->input_history.last_update = jiffies;
 136                 }
 137
 138                 mutex_unlock(&psu->input_history.update_lock);
 139         }
 140
 141         return simple_read_from_buffer(buf, count, ppos,
 142                                        psu->input_history.data,
 143                                        psu->input_history.byte_count);
 144 }
 145
 146 static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
 147                                       size_t count, loff_t *ppos)
 148 {
 149         u8 cmd;
 150         int i, rc;
 151         int *idxp = file->private_data;
 152         int idx = *idxp;
 153         struct ibm_cffps *psu = to_psu(idxp, idx);
 154         char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
 155
 156         pmbus_set_page(psu->client, 0, 0xff);
 157
 158         switch (idx) {
 159         case CFFPS_DEBUGFS_INPUT_HISTORY:
 160                 return ibm_cffps_read_input_history(psu, buf, count, ppos);
 161         case CFFPS_DEBUGFS_FRU:
 162                 cmd = CFFPS_FRU_CMD;
 163                 break;
 164         case CFFPS_DEBUGFS_PN:
 165                 cmd = CFFPS_PN_CMD;
 166                 break;
 167         case CFFPS_DEBUGFS_HEADER:
 168                 cmd = CFFPS_HEADER_CMD;
 169                 break;
 170         case CFFPS_DEBUGFS_SN:
 171                 cmd = CFFPS_SN_CMD;
 172                 break;
 173         case CFFPS_DEBUGFS_MAX_POWER_OUT:
 174                 rc = i2c_smbus_read_word_swapped(psu->client,
 175                                                  CFFPS_MAX_POWER_OUT_CMD);
 176                 if (rc < 0)
 177                         return rc;
 178
 179                 rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc);
 180                 goto done;
 181         case CFFPS_DEBUGFS_CCIN:
 182                 rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD);
 183                 if (rc < 0)
 184                         return rc;
 185
 186                 rc = snprintf(data, 5, "%04X", rc);
 187                 goto done;
 188         case CFFPS_DEBUGFS_FW:
 189                 switch (psu->version) {
 190                 case cffps1:
 191                         for (i = 0; i < CFFPS1_FW_NUM_BYTES; ++i) {
 192                                 rc = i2c_smbus_read_byte_data(psu->client,
 193                                                               CFFPS_FW_CMD +
 194                                                                 i);
 195                                 if (rc < 0)
 196                                         return rc;
 197
 198                                 snprintf(&data[i * 2], 3, "%02X", rc);
 199                         }
 200
 201                         rc = i * 2;
 202                         break;
 203                 case cffps2:
 204                         for (i = 0; i < CFFPS2_FW_NUM_WORDS; ++i) {
 205                                 rc = i2c_smbus_read_word_data(psu->client,
 206                                                               CFFPS_FW_CMD +
 207                                                                 i);
 208                                 if (rc < 0)
 209                                         return rc;
 210
 211                                 snprintf(&data[i * 4], 5, "%04X", rc);
 212                         }
 213
 214                         rc = i * 4;
 215                         break;
 216                 default:
 217                         return -EOPNOTSUPP;
 218                 }
 219                 goto done;
 220         case CFFPS_DEBUGFS_ON_OFF_CONFIG:
 221                 rc = i2c_smbus_read_byte_data(psu->client,
 222                                               PMBUS_ON_OFF_CONFIG);
 223                 if (rc < 0)
 224                         return rc;
 225
 226                 rc = snprintf(data, 3, "%02x", rc);
 227                 goto done;
 228         default:
 229                 return -EINVAL;
 230         }
 231
 232         rc = i2c_smbus_read_block_data(psu->client, cmd, data);
 233         if (rc < 0)
 234                 return rc;
 235
 236 done:
 237         data[rc] = '\n';
 238         rc += 2;
 239
 240         return simple_read_from_buffer(buf, count, ppos, data, rc);
 241 }
 242
 243 static ssize_t ibm_cffps_debugfs_write(struct file *file,
 244                                        const char __user *buf, size_t count,
 245                                        loff_t *ppos)
 246 {
 247         u8 data;
 248         ssize_t rc;
 249         int *idxp = file->private_data;
 250         int idx = *idxp;
 251         struct ibm_cffps *psu = to_psu(idxp, idx);
 252
 253         switch (idx) {
 254         case CFFPS_DEBUGFS_ON_OFF_CONFIG:
 255                 pmbus_set_page(psu->client, 0, 0xff);
 256
 257                 rc = simple_write_to_buffer(&data, 1, ppos, buf, count);
 258                 if (rc <= 0)
 259                         return rc;
 260
 261                 rc = i2c_smbus_write_byte_data(psu->client,
 262                                                PMBUS_ON_OFF_CONFIG, data);
 263                 if (rc)
 264                         return rc;
 265
 266                 rc = 1;
 267                 break;
 268         default:
 269                 return -EINVAL;
 270         }
 271
 272         return rc;
 273 }
 274
 275 static const struct file_operations ibm_cffps_fops = {
 276         .llseek = noop_llseek,
 277         .read = ibm_cffps_debugfs_read,
 278         .write = ibm_cffps_debugfs_write,
 279         .open = simple_open,
 280 };
 281
 282 static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
 283                                     int reg)
 284 {
 285         int rc, mfr;
 286
 287         switch (reg) {
 288         case PMBUS_STATUS_VOUT:
 289         case PMBUS_STATUS_IOUT:
 290         case PMBUS_STATUS_TEMPERATURE:
 291         case PMBUS_STATUS_FAN_12:
 292                 rc = pmbus_read_byte_data(client, page, reg);
 293                 if (rc < 0)
 294                         return rc;
 295
 296                 mfr = pmbus_read_byte_data(client, page,
 297                                            PMBUS_STATUS_MFR_SPECIFIC);
 298                 if (mfr < 0)
 299                         /*
 300                          * Return the status register instead of an error,
 301                          * since we successfully read status.
 302                          */
 303                         return rc;
 304
 305                 /* Add MFR_SPECIFIC bits to the standard pmbus status regs. */
 306                 if (reg == PMBUS_STATUS_FAN_12) {
 307                         if (mfr & CFFPS_MFR_FAN_FAULT)
 308                                 rc |= PB_FAN_FAN1_FAULT;
 309                 } else if (reg == PMBUS_STATUS_TEMPERATURE) {
 310                         if (mfr & CFFPS_MFR_THERMAL_FAULT)
 311                                 rc |= PB_TEMP_OT_FAULT;
 312                 } else if (reg == PMBUS_STATUS_VOUT) {
 313                         if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))
 314                                 rc |= PB_VOLTAGE_OV_FAULT;
 315                         if (mfr & CFFPS_MFR_UV_FAULT)
 316                                 rc |= PB_VOLTAGE_UV_FAULT;
 317                 } else if (reg == PMBUS_STATUS_IOUT) {
 318                         if (mfr & CFFPS_MFR_OC_FAULT)
 319                                 rc |= PB_IOUT_OC_FAULT;
 320                         if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)
 321                                 rc |= PB_CURRENT_SHARE_FAULT;
 322                 }
 323                 break;
 324         default:
 325                 rc = -ENODATA;
 326                 break;
 327         }
 328
 329         return rc;
 330 }
 331
 332 static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
 333                                     int phase, int reg)
 334 {
 335         int rc, mfr;
 336
 337         switch (reg) {
 338         case PMBUS_STATUS_WORD:
 339                 rc = pmbus_read_word_data(client, page, phase, reg);
 340                 if (rc < 0)
 341                         return rc;
 342
 343                 mfr = pmbus_read_byte_data(client, page,
 344                                            PMBUS_STATUS_MFR_SPECIFIC);
 345                 if (mfr < 0)
 346                         /*
 347                          * Return the status register instead of an error,
 348                          * since we successfully read status.
 349                          */
 350                         return rc;
 351
 352                 if (mfr & CFFPS_MFR_PS_KILL)
 353                         rc |= PB_STATUS_OFF;
 354                 break;
 355         case PMBUS_VIRT_READ_VMON:
 356                 rc = pmbus_read_word_data(client, page, phase,
 357                                           CFFPS_12VCS_VOUT_CMD);
 358                 break;
 359         default:
 360                 rc = -ENODATA;
 361                 break;
 362         }
 363
 364         return rc;
 365 }
 366
 367 static int ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
 368                                         enum led_brightness brightness)
 369 {
 370         int rc;
 371         u8 next_led_state;
 372         struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
 373
 374         if (brightness == LED_OFF) {
 375                 next_led_state = CFFPS_LED_OFF;
 376         } else {
 377                 brightness = LED_FULL;
 378
 379                 if (psu->led_state != CFFPS_LED_BLINK)
 380                         next_led_state = CFFPS_LED_ON;
 381                 else
 382                         next_led_state = CFFPS_LED_BLINK;
 383         }
 384
 385         dev_dbg(&psu->client->dev, "LED brightness set: %d. Command: %d.\n",
 386                 brightness, next_led_state);
 387
 388         pmbus_set_page(psu->client, 0, 0xff);
 389
 390         rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
 391                                        next_led_state);
 392         if (rc < 0)
 393                 return rc;
 394
 395         psu->led_state = next_led_state;
 396         led_cdev->brightness = brightness;
 397
 398         return 0;
 399 }
 400
 401 static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
 402                                    unsigned long *delay_on,
 403                                    unsigned long *delay_off)
 404 {
 405         int rc;
 406         struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
 407
 408         dev_dbg(&psu->client->dev, "LED blink set.\n");
 409
 410         pmbus_set_page(psu->client, 0, 0xff);
 411
 412         rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
 413                                        CFFPS_LED_BLINK);
 414         if (rc < 0)
 415                 return rc;
 416
 417         psu->led_state = CFFPS_LED_BLINK;
 418         led_cdev->brightness = LED_FULL;
 419         *delay_on = CFFPS_BLINK_RATE_MS;
 420         *delay_off = CFFPS_BLINK_RATE_MS;
 421
 422         return 0;
 423 }
 424
 425 static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
 426 {
 427         int rc;
 428         struct i2c_client *client = psu->client;
 429         struct device *dev = &client->dev;
 430
 431         snprintf(psu->led_name, sizeof(psu->led_name), "%s-%02x", client->name,
 432                  client->addr);
 433         psu->led.name = psu->led_name;
 434         psu->led.max_brightness = LED_FULL;
 435         psu->led.brightness_set_blocking = ibm_cffps_led_brightness_set;
 436         psu->led.blink_set = ibm_cffps_led_blink_set;
 437
 438         rc = devm_led_classdev_register(dev, &psu->led);
 439         if (rc)
 440                 dev_warn(dev, "failed to register led class: %d\n", rc);
 441         else
 442                 i2c_smbus_write_byte_data(client, CFFPS_SYS_CONFIG_CMD,
 443                                           CFFPS_LED_OFF);
 444 }
 445
 446 static struct pmbus_driver_info ibm_cffps_info[] = {
 447         [cffps1] = {
 448                 .pages = 1,
 449                 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
 450                         PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
 451                         PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
 452                         PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
 453                         PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
 454                         PMBUS_HAVE_STATUS_FAN12,
 455                 .read_byte_data = ibm_cffps_read_byte_data,
 456                 .read_word_data = ibm_cffps_read_word_data,
 457         },
 458         [cffps2] = {
 459                 .pages = 2,
 460                 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
 461                         PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
 462                         PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
 463                         PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
 464                         PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
 465                         PMBUS_HAVE_STATUS_FAN12 | PMBUS_HAVE_VMON,
 466                 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
 467                         PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
 468                         PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT,
 469                 .read_byte_data = ibm_cffps_read_byte_data,
 470                 .read_word_data = ibm_cffps_read_word_data,
 471         },
 472 };
 473
 474 static struct pmbus_platform_data ibm_cffps_pdata = {
 475         .flags = PMBUS_SKIP_STATUS_CHECK,
 476 };
 477
 478 static int ibm_cffps_probe(struct i2c_client *client)
 479 {
 480         int i, rc;
 481         enum versions vs = cffps_unknown;
 482         struct dentry *debugfs;
 483         struct dentry *ibm_cffps_dir;
 484         struct ibm_cffps *psu;
 485         const void *md = of_device_get_match_data(&client->dev);
 486         const struct i2c_device_id *id;
 487
 488         if (md) {
 489                 vs = (enum versions)md;
 490         } else {
 491                 id = i2c_match_id(ibm_cffps_id, client);
 492                 if (id)
 493                         vs = (enum versions)id->driver_data;
 494         }
 495
 496         if (vs == cffps_unknown) {
 497                 u16 ccin_revision = 0;
 498                 u16 ccin_version = CFFPS_CCIN_VERSION_1;
 499                 int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);
 500
 501                 if (ccin > 0) {
 502                         ccin_revision = FIELD_GET(CFFPS_CCIN_REVISION, ccin);
 503                         ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
 504                 }
 505
 506                 switch (ccin_version) {
 507                 default:
 508                 case CFFPS_CCIN_VERSION_1:
 509                         vs = cffps1;
 510                         break;
 511                 case CFFPS_CCIN_VERSION_2:
 512                         vs = cffps2;
 513                         break;
 514                 case CFFPS_CCIN_VERSION_3:
 515                         if (ccin_revision == CFFPS_CCIN_REVISION_LEGACY)
 516                                 vs = cffps1;
 517                         else
 518                                 vs = cffps2;
 519                         break;
 520                 }
 521
 522                 /* Set the client name to include the version number. */
 523                 snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);
 524         }
 525
 526         client->dev.platform_data = &ibm_cffps_pdata;
 527         rc = pmbus_do_probe(client, &ibm_cffps_info[vs]);
 528         if (rc)
 529                 return rc;
 530
 531         /*
 532          * Don't fail the probe if there isn't enough memory for leds and
 533          * debugfs.
 534          */
 535         psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
 536         if (!psu)
 537                 return 0;
 538
 539         psu->version = vs;
 540         psu->client = client;
 541         mutex_init(&psu->input_history.update_lock);
 542         psu->input_history.last_update = jiffies - HZ;
 543
 544         ibm_cffps_create_led_class(psu);
 545
 546         /* Don't fail the probe if we can't create debugfs */
 547         debugfs = pmbus_get_debugfs_dir(client);
 548         if (!debugfs)
 549                 return 0;
 550
 551         ibm_cffps_dir = debugfs_create_dir(client->name, debugfs);
 552         if (!ibm_cffps_dir)
 553                 return 0;
 554
 555         for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i)
 556                 psu->debugfs_entries[i] = i;
 557
 558         debugfs_create_file("input_history", 0444, ibm_cffps_dir,
 559                             &psu->debugfs_entries[CFFPS_DEBUGFS_INPUT_HISTORY],
 560                             &ibm_cffps_fops);
 561         debugfs_create_file("fru", 0444, ibm_cffps_dir,
 562                             &psu->debugfs_entries[CFFPS_DEBUGFS_FRU],
 563                             &ibm_cffps_fops);
 564         debugfs_create_file("part_number", 0444, ibm_cffps_dir,
 565                             &psu->debugfs_entries[CFFPS_DEBUGFS_PN],
 566                             &ibm_cffps_fops);
 567         debugfs_create_file("header", 0444, ibm_cffps_dir,
 568                             &psu->debugfs_entries[CFFPS_DEBUGFS_HEADER],
 569                             &ibm_cffps_fops);
 570         debugfs_create_file("serial_number", 0444, ibm_cffps_dir,
 571                             &psu->debugfs_entries[CFFPS_DEBUGFS_SN],
 572                             &ibm_cffps_fops);
 573         debugfs_create_file("max_power_out", 0444, ibm_cffps_dir,
 574                             &psu->debugfs_entries[CFFPS_DEBUGFS_MAX_POWER_OUT],
 575                             &ibm_cffps_fops);
 576         debugfs_create_file("ccin", 0444, ibm_cffps_dir,
 577                             &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],
 578                             &ibm_cffps_fops);
 579         debugfs_create_file("fw_version", 0444, ibm_cffps_dir,
 580                             &psu->debugfs_entries[CFFPS_DEBUGFS_FW],
 581                             &ibm_cffps_fops);
 582         debugfs_create_file("on_off_config", 0644, ibm_cffps_dir,
 583                             &psu->debugfs_entries[CFFPS_DEBUGFS_ON_OFF_CONFIG],
 584                             &ibm_cffps_fops);
 585
 586         return 0;
 587 }
 588
 589 static const struct i2c_device_id ibm_cffps_id[] = {
 590         { "ibm_cffps1", cffps1 },
 591         { "ibm_cffps2", cffps2 },
 592         { "ibm_cffps", cffps_unknown },
 593         {}
 594 };
 595 MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
 596
 597 static const struct of_device_id ibm_cffps_of_match[] = {
 598         {
 599                 .compatible = "ibm,cffps1",
 600                 .data = (void *)cffps1
 601         },
 602         {
 603                 .compatible = "ibm,cffps2",
 604                 .data = (void *)cffps2
 605         },
 606         {
 607                 .compatible = "ibm,cffps",
 608                 .data = (void *)cffps_unknown
 609         },
 610         {}
 611 };
 612 MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
 613
 614 static struct i2c_driver ibm_cffps_driver = {
 615         .driver = {
 616                 .name = "ibm-cffps",
 617                 .of_match_table = ibm_cffps_of_match,
 618         },
 619         .probe_new = ibm_cffps_probe,
 620         .id_table = ibm_cffps_id,
 621 };
 622
 623 module_i2c_driver(ibm_cffps_driver);
 624
 625 MODULE_AUTHOR("Eddie James");
 626 MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");
 627 MODULE_LICENSE("GPL");