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