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_device.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 ktime_t write_time; 71 }; 72 #define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info) 73 74 struct ucd9000_debugfs_entry { 75 struct i2c_client *client; 76 u8 index; 77 }; 78 79 /* 80 * It has been observed that the UCD90320 randomly fails register access when 81 * doing another access right on the back of a register write. To mitigate this 82 * make sure that there is a minimum delay between a write access and the 83 * following access. The 250us is based on experimental data. At a delay of 84 * 200us the issue seems to go away. Add a bit of extra margin to allow for 85 * system to system differences. 86 */ 87 #define UCD90320_WAIT_DELAY_US 250 88 89 static inline void ucd90320_wait(const struct ucd9000_data *data) 90 { 91 s64 delta = ktime_us_delta(ktime_get(), data->write_time); 92 93 if (delta < UCD90320_WAIT_DELAY_US) 94 udelay(UCD90320_WAIT_DELAY_US - delta); 95 } 96 97 static int ucd90320_read_word_data(struct i2c_client *client, int page, 98 int phase, int reg) 99 { 100 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 101 struct ucd9000_data *data = to_ucd9000_data(info); 102 103 if (reg >= PMBUS_VIRT_BASE) 104 return -ENXIO; 105 106 ucd90320_wait(data); 107 return pmbus_read_word_data(client, page, phase, reg); 108 } 109 110 static int ucd90320_read_byte_data(struct i2c_client *client, int page, int reg) 111 { 112 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 113 struct ucd9000_data *data = to_ucd9000_data(info); 114 115 ucd90320_wait(data); 116 return pmbus_read_byte_data(client, page, reg); 117 } 118 119 static int ucd90320_write_word_data(struct i2c_client *client, int page, 120 int reg, u16 word) 121 { 122 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 123 struct ucd9000_data *data = to_ucd9000_data(info); 124 int ret; 125 126 ucd90320_wait(data); 127 ret = pmbus_write_word_data(client, page, reg, word); 128 data->write_time = ktime_get(); 129 130 return ret; 131 } 132 133 static int ucd90320_write_byte(struct i2c_client *client, int page, u8 value) 134 { 135 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 136 struct ucd9000_data *data = to_ucd9000_data(info); 137 int ret; 138 139 ucd90320_wait(data); 140 ret = pmbus_write_byte(client, page, value); 141 data->write_time = ktime_get(); 142 143 return ret; 144 } 145 146 static int ucd9000_get_fan_config(struct i2c_client *client, int fan) 147 { 148 int fan_config = 0; 149 struct ucd9000_data *data 150 = to_ucd9000_data(pmbus_get_driver_info(client)); 151 152 if (data->fan_data[fan][3] & 1) 153 fan_config |= PB_FAN_2_INSTALLED; /* Use lower bit position */ 154 155 /* Pulses/revolution */ 156 fan_config |= (data->fan_data[fan][3] & 0x06) >> 1; 157 158 return fan_config; 159 } 160 161 static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg) 162 { 163 int ret = 0; 164 int fan_config; 165 166 switch (reg) { 167 case PMBUS_FAN_CONFIG_12: 168 if (page > 0) 169 return -ENXIO; 170 171 ret = ucd9000_get_fan_config(client, 0); 172 if (ret < 0) 173 return ret; 174 fan_config = ret << 4; 175 ret = ucd9000_get_fan_config(client, 1); 176 if (ret < 0) 177 return ret; 178 fan_config |= ret; 179 ret = fan_config; 180 break; 181 case PMBUS_FAN_CONFIG_34: 182 if (page > 0) 183 return -ENXIO; 184 185 ret = ucd9000_get_fan_config(client, 2); 186 if (ret < 0) 187 return ret; 188 fan_config = ret << 4; 189 ret = ucd9000_get_fan_config(client, 3); 190 if (ret < 0) 191 return ret; 192 fan_config |= ret; 193 ret = fan_config; 194 break; 195 default: 196 ret = -ENODATA; 197 break; 198 } 199 return ret; 200 } 201 202 static const struct i2c_device_id ucd9000_id[] = { 203 {"ucd9000", ucd9000}, 204 {"ucd90120", ucd90120}, 205 {"ucd90124", ucd90124}, 206 {"ucd90160", ucd90160}, 207 {"ucd90320", ucd90320}, 208 {"ucd9090", ucd9090}, 209 {"ucd90910", ucd90910}, 210 {} 211 }; 212 MODULE_DEVICE_TABLE(i2c, ucd9000_id); 213 214 static const struct of_device_id __maybe_unused ucd9000_of_match[] = { 215 { 216 .compatible = "ti,ucd9000", 217 .data = (void *)ucd9000 218 }, 219 { 220 .compatible = "ti,ucd90120", 221 .data = (void *)ucd90120 222 }, 223 { 224 .compatible = "ti,ucd90124", 225 .data = (void *)ucd90124 226 }, 227 { 228 .compatible = "ti,ucd90160", 229 .data = (void *)ucd90160 230 }, 231 { 232 .compatible = "ti,ucd90320", 233 .data = (void *)ucd90320 234 }, 235 { 236 .compatible = "ti,ucd9090", 237 .data = (void *)ucd9090 238 }, 239 { 240 .compatible = "ti,ucd90910", 241 .data = (void *)ucd90910 242 }, 243 { }, 244 }; 245 MODULE_DEVICE_TABLE(of, ucd9000_of_match); 246 247 #ifdef CONFIG_GPIOLIB 248 static int ucd9000_gpio_read_config(struct i2c_client *client, 249 unsigned int offset) 250 { 251 int ret; 252 253 /* No page set required */ 254 ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset); 255 if (ret < 0) 256 return ret; 257 258 return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG); 259 } 260 261 static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset) 262 { 263 struct i2c_client *client = gpiochip_get_data(gc); 264 int ret; 265 266 ret = ucd9000_gpio_read_config(client, offset); 267 if (ret < 0) 268 return ret; 269 270 return !!(ret & UCD9000_GPIO_CONFIG_STATUS); 271 } 272 273 static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset, 274 int value) 275 { 276 struct i2c_client *client = gpiochip_get_data(gc); 277 int ret; 278 279 ret = ucd9000_gpio_read_config(client, offset); 280 if (ret < 0) { 281 dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n", 282 offset, ret); 283 return; 284 } 285 286 if (value) { 287 if (ret & UCD9000_GPIO_CONFIG_STATUS) 288 return; 289 290 ret |= UCD9000_GPIO_CONFIG_STATUS; 291 } else { 292 if (!(ret & UCD9000_GPIO_CONFIG_STATUS)) 293 return; 294 295 ret &= ~UCD9000_GPIO_CONFIG_STATUS; 296 } 297 298 ret |= UCD9000_GPIO_CONFIG_ENABLE; 299 300 /* Page set not required */ 301 ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret); 302 if (ret < 0) { 303 dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n", 304 offset, ret); 305 return; 306 } 307 308 ret &= ~UCD9000_GPIO_CONFIG_ENABLE; 309 310 ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret); 311 if (ret < 0) 312 dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n", 313 offset, ret); 314 } 315 316 static int ucd9000_gpio_get_direction(struct gpio_chip *gc, 317 unsigned int offset) 318 { 319 struct i2c_client *client = gpiochip_get_data(gc); 320 int ret; 321 322 ret = ucd9000_gpio_read_config(client, offset); 323 if (ret < 0) 324 return ret; 325 326 return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE); 327 } 328 329 static int ucd9000_gpio_set_direction(struct gpio_chip *gc, 330 unsigned int offset, bool direction_out, 331 int requested_out) 332 { 333 struct i2c_client *client = gpiochip_get_data(gc); 334 int ret, config, out_val; 335 336 ret = ucd9000_gpio_read_config(client, offset); 337 if (ret < 0) 338 return ret; 339 340 if (direction_out) { 341 out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0; 342 343 if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) { 344 if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val) 345 return 0; 346 } else { 347 ret |= UCD9000_GPIO_CONFIG_OUT_ENABLE; 348 } 349 350 if (out_val) 351 ret |= UCD9000_GPIO_CONFIG_OUT_VALUE; 352 else 353 ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE; 354 355 } else { 356 if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE)) 357 return 0; 358 359 ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE; 360 } 361 362 ret |= UCD9000_GPIO_CONFIG_ENABLE; 363 config = ret; 364 365 /* Page set not required */ 366 ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config); 367 if (ret < 0) 368 return ret; 369 370 config &= ~UCD9000_GPIO_CONFIG_ENABLE; 371 372 return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config); 373 } 374 375 static int ucd9000_gpio_direction_input(struct gpio_chip *gc, 376 unsigned int offset) 377 { 378 return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0); 379 } 380 381 static int ucd9000_gpio_direction_output(struct gpio_chip *gc, 382 unsigned int offset, int val) 383 { 384 return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT, 385 val); 386 } 387 388 static void ucd9000_probe_gpio(struct i2c_client *client, 389 const struct i2c_device_id *mid, 390 struct ucd9000_data *data) 391 { 392 int rc; 393 394 switch (mid->driver_data) { 395 case ucd9090: 396 data->gpio.ngpio = UCD9090_NUM_GPIOS; 397 break; 398 case ucd90120: 399 case ucd90124: 400 case ucd90160: 401 data->gpio.ngpio = UCD901XX_NUM_GPIOS; 402 break; 403 case ucd90320: 404 data->gpio.ngpio = UCD90320_NUM_GPIOS; 405 break; 406 case ucd90910: 407 data->gpio.ngpio = UCD90910_NUM_GPIOS; 408 break; 409 default: 410 return; /* GPIO support is optional. */ 411 } 412 413 /* 414 * Pinmux support has not been added to the new gpio_chip. 415 * This support should be added when possible given the mux 416 * behavior of these IO devices. 417 */ 418 data->gpio.label = client->name; 419 data->gpio.get_direction = ucd9000_gpio_get_direction; 420 data->gpio.direction_input = ucd9000_gpio_direction_input; 421 data->gpio.direction_output = ucd9000_gpio_direction_output; 422 data->gpio.get = ucd9000_gpio_get; 423 data->gpio.set = ucd9000_gpio_set; 424 data->gpio.can_sleep = true; 425 data->gpio.base = -1; 426 data->gpio.parent = &client->dev; 427 428 rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client); 429 if (rc) 430 dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc); 431 } 432 #else 433 static void ucd9000_probe_gpio(struct i2c_client *client, 434 const struct i2c_device_id *mid, 435 struct ucd9000_data *data) 436 { 437 } 438 #endif /* CONFIG_GPIOLIB */ 439 440 #ifdef CONFIG_DEBUG_FS 441 static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer) 442 { 443 int ret = pmbus_set_page(client, 0, 0xff); 444 445 if (ret < 0) 446 return ret; 447 448 return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer); 449 } 450 451 static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val) 452 { 453 struct ucd9000_debugfs_entry *entry = data; 454 struct i2c_client *client = entry->client; 455 u8 buffer[I2C_SMBUS_BLOCK_MAX]; 456 int ret, i; 457 458 ret = ucd9000_get_mfr_status(client, buffer); 459 if (ret < 0) 460 return ret; 461 462 /* 463 * GPI fault bits are in sets of 8, two bytes from end of response. 464 */ 465 i = ret - 3 - entry->index / 8; 466 if (i >= 0) 467 *val = !!(buffer[i] & BIT(entry->index % 8)); 468 469 return 0; 470 } 471 DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit, 472 ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n"); 473 474 static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file, 475 char __user *buf, size_t count, 476 loff_t *ppos) 477 { 478 struct i2c_client *client = file->private_data; 479 u8 buffer[I2C_SMBUS_BLOCK_MAX]; 480 char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2]; 481 char *res; 482 int rc; 483 484 rc = ucd9000_get_mfr_status(client, buffer); 485 if (rc < 0) 486 return rc; 487 488 res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX)); 489 *res++ = '\n'; 490 *res = 0; 491 492 return simple_read_from_buffer(buf, count, ppos, str, res - str); 493 } 494 495 static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = { 496 .llseek = noop_llseek, 497 .read = ucd9000_debugfs_read_mfr_status, 498 .open = simple_open, 499 }; 500 501 static int ucd9000_init_debugfs(struct i2c_client *client, 502 const struct i2c_device_id *mid, 503 struct ucd9000_data *data) 504 { 505 struct dentry *debugfs; 506 struct ucd9000_debugfs_entry *entries; 507 int i, gpi_count; 508 char name[UCD9000_DEBUGFS_NAME_LEN]; 509 510 debugfs = pmbus_get_debugfs_dir(client); 511 if (!debugfs) 512 return -ENOENT; 513 514 data->debugfs = debugfs_create_dir(client->name, debugfs); 515 516 /* 517 * Of the chips this driver supports, only the UCD9090, UCD90160, 518 * UCD90320, and UCD90910 report GPI faults in their MFR_STATUS 519 * register, so only create the GPI fault debugfs attributes for those 520 * chips. 521 */ 522 if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 || 523 mid->driver_data == ucd90320 || mid->driver_data == ucd90910) { 524 gpi_count = mid->driver_data == ucd90320 ? UCD90320_GPI_COUNT 525 : UCD9000_GPI_COUNT; 526 entries = devm_kcalloc(&client->dev, 527 gpi_count, sizeof(*entries), 528 GFP_KERNEL); 529 if (!entries) 530 return -ENOMEM; 531 532 for (i = 0; i < gpi_count; i++) { 533 entries[i].client = client; 534 entries[i].index = i; 535 scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, 536 "gpi%d_alarm", i + 1); 537 debugfs_create_file(name, 0444, data->debugfs, 538 &entries[i], 539 &ucd9000_debugfs_mfr_status_bit); 540 } 541 } 542 543 scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status"); 544 debugfs_create_file(name, 0444, data->debugfs, client, 545 &ucd9000_debugfs_show_mfr_status_fops); 546 547 return 0; 548 } 549 #else 550 static int ucd9000_init_debugfs(struct i2c_client *client, 551 const struct i2c_device_id *mid, 552 struct ucd9000_data *data) 553 { 554 return 0; 555 } 556 #endif /* CONFIG_DEBUG_FS */ 557 558 static int ucd9000_probe(struct i2c_client *client) 559 { 560 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; 561 struct ucd9000_data *data; 562 struct pmbus_driver_info *info; 563 const struct i2c_device_id *mid; 564 enum chips chip; 565 int i, ret; 566 567 if (!i2c_check_functionality(client->adapter, 568 I2C_FUNC_SMBUS_BYTE_DATA | 569 I2C_FUNC_SMBUS_BLOCK_DATA)) 570 return -ENODEV; 571 572 ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID, 573 block_buffer); 574 if (ret < 0) { 575 dev_err(&client->dev, "Failed to read device ID\n"); 576 return ret; 577 } 578 block_buffer[ret] = '\0'; 579 dev_info(&client->dev, "Device ID %s\n", block_buffer); 580 581 for (mid = ucd9000_id; mid->name[0]; mid++) { 582 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) 583 break; 584 } 585 if (!mid->name[0]) { 586 dev_err(&client->dev, "Unsupported device\n"); 587 return -ENODEV; 588 } 589 590 if (client->dev.of_node) 591 chip = (enum chips)of_device_get_match_data(&client->dev); 592 else 593 chip = mid->driver_data; 594 595 if (chip != ucd9000 && strcmp(client->name, mid->name) != 0) 596 dev_notice(&client->dev, 597 "Device mismatch: Configured %s, detected %s\n", 598 client->name, mid->name); 599 600 data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data), 601 GFP_KERNEL); 602 if (!data) 603 return -ENOMEM; 604 info = &data->info; 605 606 ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES); 607 if (ret < 0) { 608 dev_err(&client->dev, 609 "Failed to read number of active pages\n"); 610 return ret; 611 } 612 info->pages = ret; 613 if (!info->pages) { 614 dev_err(&client->dev, "No pages configured\n"); 615 return -ENODEV; 616 } 617 618 /* The internal temperature sensor is always active */ 619 info->func[0] = PMBUS_HAVE_TEMP; 620 621 /* Everything else is configurable */ 622 ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG, 623 block_buffer); 624 if (ret <= 0) { 625 dev_err(&client->dev, "Failed to read configuration data\n"); 626 return -ENODEV; 627 } 628 for (i = 0; i < ret; i++) { 629 int page = UCD9000_MON_PAGE(block_buffer[i]); 630 631 if (page >= info->pages) 632 continue; 633 634 switch (UCD9000_MON_TYPE(block_buffer[i])) { 635 case UCD9000_MON_VOLTAGE: 636 case UCD9000_MON_VOLTAGE_HW: 637 info->func[page] |= PMBUS_HAVE_VOUT 638 | PMBUS_HAVE_STATUS_VOUT; 639 break; 640 case UCD9000_MON_TEMPERATURE: 641 info->func[page] |= PMBUS_HAVE_TEMP2 642 | PMBUS_HAVE_STATUS_TEMP; 643 break; 644 case UCD9000_MON_CURRENT: 645 info->func[page] |= PMBUS_HAVE_IOUT 646 | PMBUS_HAVE_STATUS_IOUT; 647 break; 648 default: 649 break; 650 } 651 } 652 653 /* Fan configuration */ 654 if (mid->driver_data == ucd90124) { 655 for (i = 0; i < UCD9000_NUM_FAN; i++) { 656 i2c_smbus_write_byte_data(client, 657 UCD9000_FAN_CONFIG_INDEX, i); 658 ret = i2c_smbus_read_block_data(client, 659 UCD9000_FAN_CONFIG, 660 data->fan_data[i]); 661 if (ret < 0) 662 return ret; 663 } 664 i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0); 665 666 info->read_byte_data = ucd9000_read_byte_data; 667 info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 668 | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34; 669 } else if (mid->driver_data == ucd90320) { 670 info->read_byte_data = ucd90320_read_byte_data; 671 info->read_word_data = ucd90320_read_word_data; 672 info->write_byte = ucd90320_write_byte; 673 info->write_word_data = ucd90320_write_word_data; 674 } 675 676 ucd9000_probe_gpio(client, mid, data); 677 678 ret = pmbus_do_probe(client, info); 679 if (ret) 680 return ret; 681 682 ret = ucd9000_init_debugfs(client, mid, data); 683 if (ret) 684 dev_warn(&client->dev, "Failed to register debugfs: %d\n", 685 ret); 686 687 return 0; 688 } 689 690 /* This is the driver that will be inserted */ 691 static struct i2c_driver ucd9000_driver = { 692 .driver = { 693 .name = "ucd9000", 694 .of_match_table = of_match_ptr(ucd9000_of_match), 695 }, 696 .probe = ucd9000_probe, 697 .id_table = ucd9000_id, 698 }; 699 700 module_i2c_driver(ucd9000_driver); 701 702 MODULE_AUTHOR("Guenter Roeck"); 703 MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx"); 704 MODULE_LICENSE("GPL"); 705 MODULE_IMPORT_NS(PMBUS); 706