root/drivers/fpga/fpga-mgr.c

DEFINITIONS

1. fpga_image_info_alloc
2. fpga_image_info_free
3. fpga_mgr_write_init_buf
4. fpga_mgr_write_init_sg
5. fpga_mgr_write_complete
6. fpga_mgr_buf_load_sg
7. fpga_mgr_buf_load_mapped
8. fpga_mgr_buf_load
9. fpga_mgr_firmware_load
10. fpga_mgr_load
11. name_show
12. state_show
13. status_show
14. __fpga_mgr_get
15. fpga_mgr_dev_match
16. fpga_mgr_get
17. of_fpga_mgr_get
18. fpga_mgr_put
19. fpga_mgr_lock
20. fpga_mgr_unlock
21. fpga_mgr_create
22. fpga_mgr_free
23. devm_fpga_mgr_release
24. devm_fpga_mgr_create
25. fpga_mgr_register
26. fpga_mgr_unregister
27. fpga_mgr_dev_release
28. fpga_mgr_class_init
29. fpga_mgr_class_exit

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * FPGA Manager Core
   4  *
   5  *  Copyright (C) 2013-2015 Altera Corporation
   6  *  Copyright (C) 2017 Intel Corporation
   7  *
   8  * With code from the mailing list:
   9  * Copyright (C) 2013 Xilinx, Inc.
  10  */
  11 #include <linux/firmware.h>
  12 #include <linux/fpga/fpga-mgr.h>
  13 #include <linux/idr.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/mutex.h>
  17 #include <linux/slab.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/highmem.h>
  20 
  21 static DEFINE_IDA(fpga_mgr_ida);
  22 static struct class *fpga_mgr_class;
  23 
  24 /**
  25  * fpga_image_info_alloc - Allocate a FPGA image info struct
  26  * @dev: owning device
  27  *
  28  * Return: struct fpga_image_info or NULL
  29  */
  30 struct fpga_image_info *fpga_image_info_alloc(struct device *dev)
  31 {
  32         struct fpga_image_info *info;
  33 
  34         get_device(dev);
  35 
  36         info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
  37         if (!info) {
  38                 put_device(dev);
  39                 return NULL;
  40         }
  41 
  42         info->dev = dev;
  43 
  44         return info;
  45 }
  46 EXPORT_SYMBOL_GPL(fpga_image_info_alloc);
  47 
  48 /**
  49  * fpga_image_info_free - Free a FPGA image info struct
  50  * @info: FPGA image info struct to free
  51  */
  52 void fpga_image_info_free(struct fpga_image_info *info)
  53 {
  54         struct device *dev;
  55 
  56         if (!info)
  57                 return;
  58 
  59         dev = info->dev;
  60         if (info->firmware_name)
  61                 devm_kfree(dev, info->firmware_name);
  62 
  63         devm_kfree(dev, info);
  64         put_device(dev);
  65 }
  66 EXPORT_SYMBOL_GPL(fpga_image_info_free);
  67 
  68 /*
  69  * Call the low level driver's write_init function.  This will do the
  70  * device-specific things to get the FPGA into the state where it is ready to
  71  * receive an FPGA image. The low level driver only gets to see the first
  72  * initial_header_size bytes in the buffer.
  73  */
  74 static int fpga_mgr_write_init_buf(struct fpga_manager *mgr,
  75                                    struct fpga_image_info *info,
  76                                    const char *buf, size_t count)
  77 {
  78         int ret;
  79 
  80         mgr->state = FPGA_MGR_STATE_WRITE_INIT;
  81         if (!mgr->mops->initial_header_size)
  82                 ret = mgr->mops->write_init(mgr, info, NULL, 0);
  83         else
  84                 ret = mgr->mops->write_init(
  85                     mgr, info, buf, min(mgr->mops->initial_header_size, count));
  86 
  87         if (ret) {
  88                 dev_err(&mgr->dev, "Error preparing FPGA for writing\n");
  89                 mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR;
  90                 return ret;
  91         }
  92 
  93         return 0;
  94 }
  95 
  96 static int fpga_mgr_write_init_sg(struct fpga_manager *mgr,
  97                                   struct fpga_image_info *info,
  98                                   struct sg_table *sgt)
  99 {
 100         struct sg_mapping_iter miter;
 101         size_t len;
 102         char *buf;
 103         int ret;
 104 
 105         if (!mgr->mops->initial_header_size)
 106                 return fpga_mgr_write_init_buf(mgr, info, NULL, 0);
 107 
 108         /*
 109          * First try to use miter to map the first fragment to access the
 110          * header, this is the typical path.
 111          */
 112         sg_miter_start(&miter, sgt->sgl, sgt->nents, SG_MITER_FROM_SG);
 113         if (sg_miter_next(&miter) &&
 114             miter.length >= mgr->mops->initial_header_size) {
 115                 ret = fpga_mgr_write_init_buf(mgr, info, miter.addr,
 116                                               miter.length);
 117                 sg_miter_stop(&miter);
 118                 return ret;
 119         }
 120         sg_miter_stop(&miter);
 121 
 122         /* Otherwise copy the fragments into temporary memory. */
 123         buf = kmalloc(mgr->mops->initial_header_size, GFP_KERNEL);
 124         if (!buf)
 125                 return -ENOMEM;
 126 
 127         len = sg_copy_to_buffer(sgt->sgl, sgt->nents, buf,
 128                                 mgr->mops->initial_header_size);
 129         ret = fpga_mgr_write_init_buf(mgr, info, buf, len);
 130 
 131         kfree(buf);
 132 
 133         return ret;
 134 }
 135 
 136 /*
 137  * After all the FPGA image has been written, do the device specific steps to
 138  * finish and set the FPGA into operating mode.
 139  */
 140 static int fpga_mgr_write_complete(struct fpga_manager *mgr,
 141                                    struct fpga_image_info *info)
 142 {
 143         int ret;
 144 
 145         mgr->state = FPGA_MGR_STATE_WRITE_COMPLETE;
 146         ret = mgr->mops->write_complete(mgr, info);
 147         if (ret) {
 148                 dev_err(&mgr->dev, "Error after writing image data to FPGA\n");
 149                 mgr->state = FPGA_MGR_STATE_WRITE_COMPLETE_ERR;
 150                 return ret;
 151         }
 152         mgr->state = FPGA_MGR_STATE_OPERATING;
 153 
 154         return 0;
 155 }
 156 
 157 /**
 158  * fpga_mgr_buf_load_sg - load fpga from image in buffer from a scatter list
 159  * @mgr:        fpga manager
 160  * @info:       fpga image specific information
 161  * @sgt:        scatterlist table
 162  *
 163  * Step the low level fpga manager through the device-specific steps of getting
 164  * an FPGA ready to be configured, writing the image to it, then doing whatever
 165  * post-configuration steps necessary.  This code assumes the caller got the
 166  * mgr pointer from of_fpga_mgr_get() or fpga_mgr_get() and checked that it is
 167  * not an error code.
 168  *
 169  * This is the preferred entry point for FPGA programming, it does not require
 170  * any contiguous kernel memory.
 171  *
 172  * Return: 0 on success, negative error code otherwise.
 173  */
 174 static int fpga_mgr_buf_load_sg(struct fpga_manager *mgr,
 175                                 struct fpga_image_info *info,
 176                                 struct sg_table *sgt)
 177 {
 178         int ret;
 179 
 180         ret = fpga_mgr_write_init_sg(mgr, info, sgt);
 181         if (ret)
 182                 return ret;
 183 
 184         /* Write the FPGA image to the FPGA. */
 185         mgr->state = FPGA_MGR_STATE_WRITE;
 186         if (mgr->mops->write_sg) {
 187                 ret = mgr->mops->write_sg(mgr, sgt);
 188         } else {
 189                 struct sg_mapping_iter miter;
 190 
 191                 sg_miter_start(&miter, sgt->sgl, sgt->nents, SG_MITER_FROM_SG);
 192                 while (sg_miter_next(&miter)) {
 193                         ret = mgr->mops->write(mgr, miter.addr, miter.length);
 194                         if (ret)
 195                                 break;
 196                 }
 197                 sg_miter_stop(&miter);
 198         }
 199 
 200         if (ret) {
 201                 dev_err(&mgr->dev, "Error while writing image data to FPGA\n");
 202                 mgr->state = FPGA_MGR_STATE_WRITE_ERR;
 203                 return ret;
 204         }
 205 
 206         return fpga_mgr_write_complete(mgr, info);
 207 }
 208 
 209 static int fpga_mgr_buf_load_mapped(struct fpga_manager *mgr,
 210                                     struct fpga_image_info *info,
 211                                     const char *buf, size_t count)
 212 {
 213         int ret;
 214 
 215         ret = fpga_mgr_write_init_buf(mgr, info, buf, count);
 216         if (ret)
 217                 return ret;
 218 
 219         /*
 220          * Write the FPGA image to the FPGA.
 221          */
 222         mgr->state = FPGA_MGR_STATE_WRITE;
 223         ret = mgr->mops->write(mgr, buf, count);
 224         if (ret) {
 225                 dev_err(&mgr->dev, "Error while writing image data to FPGA\n");
 226                 mgr->state = FPGA_MGR_STATE_WRITE_ERR;
 227                 return ret;
 228         }
 229 
 230         return fpga_mgr_write_complete(mgr, info);
 231 }
 232 
 233 /**
 234  * fpga_mgr_buf_load - load fpga from image in buffer
 235  * @mgr:        fpga manager
 236  * @info:       fpga image info
 237  * @buf:        buffer contain fpga image
 238  * @count:      byte count of buf
 239  *
 240  * Step the low level fpga manager through the device-specific steps of getting
 241  * an FPGA ready to be configured, writing the image to it, then doing whatever
 242  * post-configuration steps necessary.  This code assumes the caller got the
 243  * mgr pointer from of_fpga_mgr_get() and checked that it is not an error code.
 244  *
 245  * Return: 0 on success, negative error code otherwise.
 246  */
 247 static int fpga_mgr_buf_load(struct fpga_manager *mgr,
 248                              struct fpga_image_info *info,
 249                              const char *buf, size_t count)
 250 {
 251         struct page **pages;
 252         struct sg_table sgt;
 253         const void *p;
 254         int nr_pages;
 255         int index;
 256         int rc;
 257 
 258         /*
 259          * This is just a fast path if the caller has already created a
 260          * contiguous kernel buffer and the driver doesn't require SG, non-SG
 261          * drivers will still work on the slow path.
 262          */
 263         if (mgr->mops->write)
 264                 return fpga_mgr_buf_load_mapped(mgr, info, buf, count);
 265 
 266         /*
 267          * Convert the linear kernel pointer into a sg_table of pages for use
 268          * by the driver.
 269          */
 270         nr_pages = DIV_ROUND_UP((unsigned long)buf + count, PAGE_SIZE) -
 271                    (unsigned long)buf / PAGE_SIZE;
 272         pages = kmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL);
 273         if (!pages)
 274                 return -ENOMEM;
 275 
 276         p = buf - offset_in_page(buf);
 277         for (index = 0; index < nr_pages; index++) {
 278                 if (is_vmalloc_addr(p))
 279                         pages[index] = vmalloc_to_page(p);
 280                 else
 281                         pages[index] = kmap_to_page((void *)p);
 282                 if (!pages[index]) {
 283                         kfree(pages);
 284                         return -EFAULT;
 285                 }
 286                 p += PAGE_SIZE;
 287         }
 288 
 289         /*
 290          * The temporary pages list is used to code share the merging algorithm
 291          * in sg_alloc_table_from_pages
 292          */
 293         rc = sg_alloc_table_from_pages(&sgt, pages, index, offset_in_page(buf),
 294                                        count, GFP_KERNEL);
 295         kfree(pages);
 296         if (rc)
 297                 return rc;
 298 
 299         rc = fpga_mgr_buf_load_sg(mgr, info, &sgt);
 300         sg_free_table(&sgt);
 301 
 302         return rc;
 303 }
 304 
 305 /**
 306  * fpga_mgr_firmware_load - request firmware and load to fpga
 307  * @mgr:        fpga manager
 308  * @info:       fpga image specific information
 309  * @image_name: name of image file on the firmware search path
 310  *
 311  * Request an FPGA image using the firmware class, then write out to the FPGA.
 312  * Update the state before each step to provide info on what step failed if
 313  * there is a failure.  This code assumes the caller got the mgr pointer
 314  * from of_fpga_mgr_get() or fpga_mgr_get() and checked that it is not an error
 315  * code.
 316  *
 317  * Return: 0 on success, negative error code otherwise.
 318  */
 319 static int fpga_mgr_firmware_load(struct fpga_manager *mgr,
 320                                   struct fpga_image_info *info,
 321                                   const char *image_name)
 322 {
 323         struct device *dev = &mgr->dev;
 324         const struct firmware *fw;
 325         int ret;
 326 
 327         dev_info(dev, "writing %s to %s\n", image_name, mgr->name);
 328 
 329         mgr->state = FPGA_MGR_STATE_FIRMWARE_REQ;
 330 
 331         ret = request_firmware(&fw, image_name, dev);
 332         if (ret) {
 333                 mgr->state = FPGA_MGR_STATE_FIRMWARE_REQ_ERR;
 334                 dev_err(dev, "Error requesting firmware %s\n", image_name);
 335                 return ret;
 336         }
 337 
 338         ret = fpga_mgr_buf_load(mgr, info, fw->data, fw->size);
 339 
 340         release_firmware(fw);
 341 
 342         return ret;
 343 }
 344 
 345 /**
 346  * fpga_mgr_load - load FPGA from scatter/gather table, buffer, or firmware
 347  * @mgr:        fpga manager
 348  * @info:       fpga image information.
 349  *
 350  * Load the FPGA from an image which is indicated in @info.  If successful, the
 351  * FPGA ends up in operating mode.
 352  *
 353  * Return: 0 on success, negative error code otherwise.
 354  */
 355 int fpga_mgr_load(struct fpga_manager *mgr, struct fpga_image_info *info)
 356 {
 357         if (info->sgt)
 358                 return fpga_mgr_buf_load_sg(mgr, info, info->sgt);
 359         if (info->buf && info->count)
 360                 return fpga_mgr_buf_load(mgr, info, info->buf, info->count);
 361         if (info->firmware_name)
 362                 return fpga_mgr_firmware_load(mgr, info, info->firmware_name);
 363         return -EINVAL;
 364 }
 365 EXPORT_SYMBOL_GPL(fpga_mgr_load);
 366 
 367 static const char * const state_str[] = {
 368         [FPGA_MGR_STATE_UNKNOWN] =              "unknown",
 369         [FPGA_MGR_STATE_POWER_OFF] =            "power off",
 370         [FPGA_MGR_STATE_POWER_UP] =             "power up",
 371         [FPGA_MGR_STATE_RESET] =                "reset",
 372 
 373         /* requesting FPGA image from firmware */
 374         [FPGA_MGR_STATE_FIRMWARE_REQ] =         "firmware request",
 375         [FPGA_MGR_STATE_FIRMWARE_REQ_ERR] =     "firmware request error",
 376 
 377         /* Preparing FPGA to receive image */
 378         [FPGA_MGR_STATE_WRITE_INIT] =           "write init",
 379         [FPGA_MGR_STATE_WRITE_INIT_ERR] =       "write init error",
 380 
 381         /* Writing image to FPGA */
 382         [FPGA_MGR_STATE_WRITE] =                "write",
 383         [FPGA_MGR_STATE_WRITE_ERR] =            "write error",
 384 
 385         /* Finishing configuration after image has been written */
 386         [FPGA_MGR_STATE_WRITE_COMPLETE] =       "write complete",
 387         [FPGA_MGR_STATE_WRITE_COMPLETE_ERR] =   "write complete error",
 388 
 389         /* FPGA reports to be in normal operating mode */
 390         [FPGA_MGR_STATE_OPERATING] =            "operating",
 391 };
 392 
 393 static ssize_t name_show(struct device *dev,
 394                          struct device_attribute *attr, char *buf)
 395 {
 396         struct fpga_manager *mgr = to_fpga_manager(dev);
 397 
 398         return sprintf(buf, "%s\n", mgr->name);
 399 }
 400 
 401 static ssize_t state_show(struct device *dev,
 402                           struct device_attribute *attr, char *buf)
 403 {
 404         struct fpga_manager *mgr = to_fpga_manager(dev);
 405 
 406         return sprintf(buf, "%s\n", state_str[mgr->state]);
 407 }
 408 
 409 static ssize_t status_show(struct device *dev,
 410                            struct device_attribute *attr, char *buf)
 411 {
 412         struct fpga_manager *mgr = to_fpga_manager(dev);
 413         u64 status;
 414         int len = 0;
 415 
 416         if (!mgr->mops->status)
 417                 return -ENOENT;
 418 
 419         status = mgr->mops->status(mgr);
 420 
 421         if (status & FPGA_MGR_STATUS_OPERATION_ERR)
 422                 len += sprintf(buf + len, "reconfig operation error\n");
 423         if (status & FPGA_MGR_STATUS_CRC_ERR)
 424                 len += sprintf(buf + len, "reconfig CRC error\n");
 425         if (status & FPGA_MGR_STATUS_INCOMPATIBLE_IMAGE_ERR)
 426                 len += sprintf(buf + len, "reconfig incompatible image\n");
 427         if (status & FPGA_MGR_STATUS_IP_PROTOCOL_ERR)
 428                 len += sprintf(buf + len, "reconfig IP protocol error\n");
 429         if (status & FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR)
 430                 len += sprintf(buf + len, "reconfig fifo overflow error\n");
 431 
 432         return len;
 433 }
 434 
 435 static DEVICE_ATTR_RO(name);
 436 static DEVICE_ATTR_RO(state);
 437 static DEVICE_ATTR_RO(status);
 438 
 439 static struct attribute *fpga_mgr_attrs[] = {
 440         &dev_attr_name.attr,
 441         &dev_attr_state.attr,
 442         &dev_attr_status.attr,
 443         NULL,
 444 };
 445 ATTRIBUTE_GROUPS(fpga_mgr);
 446 
 447 static struct fpga_manager *__fpga_mgr_get(struct device *dev)
 448 {
 449         struct fpga_manager *mgr;
 450 
 451         mgr = to_fpga_manager(dev);
 452 
 453         if (!try_module_get(dev->parent->driver->owner))
 454                 goto err_dev;
 455 
 456         return mgr;
 457 
 458 err_dev:
 459         put_device(dev);
 460         return ERR_PTR(-ENODEV);
 461 }
 462 
 463 static int fpga_mgr_dev_match(struct device *dev, const void *data)
 464 {
 465         return dev->parent == data;
 466 }
 467 
 468 /**
 469  * fpga_mgr_get - Given a device, get a reference to a fpga mgr.
 470  * @dev:        parent device that fpga mgr was registered with
 471  *
 472  * Return: fpga manager struct or IS_ERR() condition containing error code.
 473  */
 474 struct fpga_manager *fpga_mgr_get(struct device *dev)
 475 {
 476         struct device *mgr_dev = class_find_device(fpga_mgr_class, NULL, dev,
 477                                                    fpga_mgr_dev_match);
 478         if (!mgr_dev)
 479                 return ERR_PTR(-ENODEV);
 480 
 481         return __fpga_mgr_get(mgr_dev);
 482 }
 483 EXPORT_SYMBOL_GPL(fpga_mgr_get);
 484 
 485 /**
 486  * of_fpga_mgr_get - Given a device node, get a reference to a fpga mgr.
 487  *
 488  * @node:       device node
 489  *
 490  * Return: fpga manager struct or IS_ERR() condition containing error code.
 491  */
 492 struct fpga_manager *of_fpga_mgr_get(struct device_node *node)
 493 {
 494         struct device *dev;
 495 
 496         dev = class_find_device_by_of_node(fpga_mgr_class, node);
 497         if (!dev)
 498                 return ERR_PTR(-ENODEV);
 499 
 500         return __fpga_mgr_get(dev);
 501 }
 502 EXPORT_SYMBOL_GPL(of_fpga_mgr_get);
 503 
 504 /**
 505  * fpga_mgr_put - release a reference to a fpga manager
 506  * @mgr:        fpga manager structure
 507  */
 508 void fpga_mgr_put(struct fpga_manager *mgr)
 509 {
 510         module_put(mgr->dev.parent->driver->owner);
 511         put_device(&mgr->dev);
 512 }
 513 EXPORT_SYMBOL_GPL(fpga_mgr_put);
 514 
 515 /**
 516  * fpga_mgr_lock - Lock FPGA manager for exclusive use
 517  * @mgr:        fpga manager
 518  *
 519  * Given a pointer to FPGA Manager (from fpga_mgr_get() or
 520  * of_fpga_mgr_put()) attempt to get the mutex. The user should call
 521  * fpga_mgr_lock() and verify that it returns 0 before attempting to
 522  * program the FPGA.  Likewise, the user should call fpga_mgr_unlock
 523  * when done programming the FPGA.
 524  *
 525  * Return: 0 for success or -EBUSY
 526  */
 527 int fpga_mgr_lock(struct fpga_manager *mgr)
 528 {
 529         if (!mutex_trylock(&mgr->ref_mutex)) {
 530                 dev_err(&mgr->dev, "FPGA manager is in use.\n");
 531                 return -EBUSY;
 532         }
 533 
 534         return 0;
 535 }
 536 EXPORT_SYMBOL_GPL(fpga_mgr_lock);
 537 
 538 /**
 539  * fpga_mgr_unlock - Unlock FPGA manager after done programming
 540  * @mgr:        fpga manager
 541  */
 542 void fpga_mgr_unlock(struct fpga_manager *mgr)
 543 {
 544         mutex_unlock(&mgr->ref_mutex);
 545 }
 546 EXPORT_SYMBOL_GPL(fpga_mgr_unlock);
 547 
 548 /**
 549  * fpga_mgr_create - create and initialize a FPGA manager struct
 550  * @dev:        fpga manager device from pdev
 551  * @name:       fpga manager name
 552  * @mops:       pointer to structure of fpga manager ops
 553  * @priv:       fpga manager private data
 554  *
 555  * The caller of this function is responsible for freeing the struct with
 556  * fpga_mgr_free().  Using devm_fpga_mgr_create() instead is recommended.
 557  *
 558  * Return: pointer to struct fpga_manager or NULL
 559  */
 560 struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name,
 561                                      const struct fpga_manager_ops *mops,
 562                                      void *priv)
 563 {
 564         struct fpga_manager *mgr;
 565         int id, ret;
 566 
 567         if (!mops || !mops->write_complete || !mops->state ||
 568             !mops->write_init || (!mops->write && !mops->write_sg) ||
 569             (mops->write && mops->write_sg)) {
 570                 dev_err(dev, "Attempt to register without fpga_manager_ops\n");
 571                 return NULL;
 572         }
 573 
 574         if (!name || !strlen(name)) {
 575                 dev_err(dev, "Attempt to register with no name!\n");
 576                 return NULL;
 577         }
 578 
 579         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 580         if (!mgr)
 581                 return NULL;
 582 
 583         id = ida_simple_get(&fpga_mgr_ida, 0, 0, GFP_KERNEL);
 584         if (id < 0) {
 585                 ret = id;
 586                 goto error_kfree;
 587         }
 588 
 589         mutex_init(&mgr->ref_mutex);
 590 
 591         mgr->name = name;
 592         mgr->mops = mops;
 593         mgr->priv = priv;
 594 
 595         device_initialize(&mgr->dev);
 596         mgr->dev.class = fpga_mgr_class;
 597         mgr->dev.groups = mops->groups;
 598         mgr->dev.parent = dev;
 599         mgr->dev.of_node = dev->of_node;
 600         mgr->dev.id = id;
 601 
 602         ret = dev_set_name(&mgr->dev, "fpga%d", id);
 603         if (ret)
 604                 goto error_device;
 605 
 606         return mgr;
 607 
 608 error_device:
 609         ida_simple_remove(&fpga_mgr_ida, id);
 610 error_kfree:
 611         kfree(mgr);
 612 
 613         return NULL;
 614 }
 615 EXPORT_SYMBOL_GPL(fpga_mgr_create);
 616 
 617 /**
 618  * fpga_mgr_free - free a FPGA manager created with fpga_mgr_create()
 619  * @mgr:        fpga manager struct
 620  */
 621 void fpga_mgr_free(struct fpga_manager *mgr)
 622 {
 623         ida_simple_remove(&fpga_mgr_ida, mgr->dev.id);
 624         kfree(mgr);
 625 }
 626 EXPORT_SYMBOL_GPL(fpga_mgr_free);
 627 
 628 static void devm_fpga_mgr_release(struct device *dev, void *res)
 629 {
 630         struct fpga_manager *mgr = *(struct fpga_manager **)res;
 631 
 632         fpga_mgr_free(mgr);
 633 }
 634 
 635 /**
 636  * devm_fpga_mgr_create - create and initialize a managed FPGA manager struct
 637  * @dev:        fpga manager device from pdev
 638  * @name:       fpga manager name
 639  * @mops:       pointer to structure of fpga manager ops
 640  * @priv:       fpga manager private data
 641  *
 642  * This function is intended for use in a FPGA manager driver's probe function.
 643  * After the manager driver creates the manager struct with
 644  * devm_fpga_mgr_create(), it should register it with fpga_mgr_register().  The
 645  * manager driver's remove function should call fpga_mgr_unregister().  The
 646  * manager struct allocated with this function will be freed automatically on
 647  * driver detach.  This includes the case of a probe function returning error
 648  * before calling fpga_mgr_register(), the struct will still get cleaned up.
 649  *
 650  * Return: pointer to struct fpga_manager or NULL
 651  */
 652 struct fpga_manager *devm_fpga_mgr_create(struct device *dev, const char *name,
 653                                           const struct fpga_manager_ops *mops,
 654                                           void *priv)
 655 {
 656         struct fpga_manager **ptr, *mgr;
 657 
 658         ptr = devres_alloc(devm_fpga_mgr_release, sizeof(*ptr), GFP_KERNEL);
 659         if (!ptr)
 660                 return NULL;
 661 
 662         mgr = fpga_mgr_create(dev, name, mops, priv);
 663         if (!mgr) {
 664                 devres_free(ptr);
 665         } else {
 666                 *ptr = mgr;
 667                 devres_add(dev, ptr);
 668         }
 669 
 670         return mgr;
 671 }
 672 EXPORT_SYMBOL_GPL(devm_fpga_mgr_create);
 673 
 674 /**
 675  * fpga_mgr_register - register a FPGA manager
 676  * @mgr: fpga manager struct
 677  *
 678  * Return: 0 on success, negative error code otherwise.
 679  */
 680 int fpga_mgr_register(struct fpga_manager *mgr)
 681 {
 682         int ret;
 683 
 684         /*
 685          * Initialize framework state by requesting low level driver read state
 686          * from device.  FPGA may be in reset mode or may have been programmed
 687          * by bootloader or EEPROM.
 688          */
 689         mgr->state = mgr->mops->state(mgr);
 690 
 691         ret = device_add(&mgr->dev);
 692         if (ret)
 693                 goto error_device;
 694 
 695         dev_info(&mgr->dev, "%s registered\n", mgr->name);
 696 
 697         return 0;
 698 
 699 error_device:
 700         ida_simple_remove(&fpga_mgr_ida, mgr->dev.id);
 701 
 702         return ret;
 703 }
 704 EXPORT_SYMBOL_GPL(fpga_mgr_register);
 705 
 706 /**
 707  * fpga_mgr_unregister - unregister a FPGA manager
 708  * @mgr: fpga manager struct
 709  *
 710  * This function is intended for use in a FPGA manager driver's remove function.
 711  */
 712 void fpga_mgr_unregister(struct fpga_manager *mgr)
 713 {
 714         dev_info(&mgr->dev, "%s %s\n", __func__, mgr->name);
 715 
 716         /*
 717          * If the low level driver provides a method for putting fpga into
 718          * a desired state upon unregister, do it.
 719          */
 720         if (mgr->mops->fpga_remove)
 721                 mgr->mops->fpga_remove(mgr);
 722 
 723         device_unregister(&mgr->dev);
 724 }
 725 EXPORT_SYMBOL_GPL(fpga_mgr_unregister);
 726 
 727 static void fpga_mgr_dev_release(struct device *dev)
 728 {
 729 }
 730 
 731 static int __init fpga_mgr_class_init(void)
 732 {
 733         pr_info("FPGA manager framework\n");
 734 
 735         fpga_mgr_class = class_create(THIS_MODULE, "fpga_manager");
 736         if (IS_ERR(fpga_mgr_class))
 737                 return PTR_ERR(fpga_mgr_class);
 738 
 739         fpga_mgr_class->dev_groups = fpga_mgr_groups;
 740         fpga_mgr_class->dev_release = fpga_mgr_dev_release;
 741 
 742         return 0;
 743 }
 744 
 745 static void __exit fpga_mgr_class_exit(void)
 746 {
 747         class_destroy(fpga_mgr_class);
 748         ida_destroy(&fpga_mgr_ida);
 749 }
 750 
 751 MODULE_AUTHOR("Alan Tull <atull@kernel.org>");
 752 MODULE_DESCRIPTION("FPGA manager framework");
 753 MODULE_LICENSE("GPL v2");
 754 
 755 subsys_initcall(fpga_mgr_class_init);
 756 module_exit(fpga_mgr_class_exit);