1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for the Diolan DLN-2 USB adapter 4 * 5 * Copyright (c) 2014 Intel Corporation 6 * 7 * Derived from: 8 * i2c-diolan-u2c.c 9 * Copyright (c) 2010-2011 Ericsson AB 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/types.h> 15 #include <linux/slab.h> 16 #include <linux/usb.h> 17 #include <linux/i2c.h> 18 #include <linux/mutex.h> 19 #include <linux/platform_device.h> 20 #include <linux/mfd/core.h> 21 #include <linux/mfd/dln2.h> 22 #include <linux/rculist.h> 23 24 struct dln2_header { 25 __le16 size; 26 __le16 id; 27 __le16 echo; 28 __le16 handle; 29 }; 30 31 struct dln2_response { 32 struct dln2_header hdr; 33 __le16 result; 34 }; 35 36 #define DLN2_GENERIC_MODULE_ID 0x00 37 #define DLN2_GENERIC_CMD(cmd) DLN2_CMD(cmd, DLN2_GENERIC_MODULE_ID) 38 #define CMD_GET_DEVICE_VER DLN2_GENERIC_CMD(0x30) 39 #define CMD_GET_DEVICE_SN DLN2_GENERIC_CMD(0x31) 40 41 #define DLN2_HW_ID 0x200 42 #define DLN2_USB_TIMEOUT 200 /* in ms */ 43 #define DLN2_MAX_RX_SLOTS 16 44 #define DLN2_MAX_URBS 16 45 #define DLN2_RX_BUF_SIZE 512 46 47 enum dln2_handle { 48 DLN2_HANDLE_EVENT = 0, /* don't change, hardware defined */ 49 DLN2_HANDLE_CTRL, 50 DLN2_HANDLE_GPIO, 51 DLN2_HANDLE_I2C, 52 DLN2_HANDLE_SPI, 53 DLN2_HANDLES 54 }; 55 56 /* 57 * Receive context used between the receive demultiplexer and the transfer 58 * routine. While sending a request the transfer routine will look for a free 59 * receive context and use it to wait for a response and to receive the URB and 60 * thus the response data. 61 */ 62 struct dln2_rx_context { 63 /* completion used to wait for a response */ 64 struct completion done; 65 66 /* if non-NULL the URB contains the response */ 67 struct urb *urb; 68 69 /* if true then this context is used to wait for a response */ 70 bool in_use; 71 }; 72 73 /* 74 * Receive contexts for a particular DLN2 module (i2c, gpio, etc.). We use the 75 * handle header field to identify the module in dln2_dev.mod_rx_slots and then 76 * the echo header field to index the slots field and find the receive context 77 * for a particular request. 78 */ 79 struct dln2_mod_rx_slots { 80 /* RX slots bitmap */ 81 DECLARE_BITMAP(bmap, DLN2_MAX_RX_SLOTS); 82 83 /* used to wait for a free RX slot */ 84 wait_queue_head_t wq; 85 86 /* used to wait for an RX operation to complete */ 87 struct dln2_rx_context slots[DLN2_MAX_RX_SLOTS]; 88 89 /* avoid races between alloc/free_rx_slot and dln2_rx_transfer */ 90 spinlock_t lock; 91 }; 92 93 struct dln2_dev { 94 struct usb_device *usb_dev; 95 struct usb_interface *interface; 96 u8 ep_in; 97 u8 ep_out; 98 99 struct urb *rx_urb[DLN2_MAX_URBS]; 100 void *rx_buf[DLN2_MAX_URBS]; 101 102 struct dln2_mod_rx_slots mod_rx_slots[DLN2_HANDLES]; 103 104 struct list_head event_cb_list; 105 spinlock_t event_cb_lock; 106 107 bool disconnect; 108 int active_transfers; 109 wait_queue_head_t disconnect_wq; 110 spinlock_t disconnect_lock; 111 }; 112 113 struct dln2_event_cb_entry { 114 struct list_head list; 115 u16 id; 116 struct platform_device *pdev; 117 dln2_event_cb_t callback; 118 }; 119 120 int dln2_register_event_cb(struct platform_device *pdev, u16 id, 121 dln2_event_cb_t event_cb) 122 { 123 struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); 124 struct dln2_event_cb_entry *i, *entry; 125 unsigned long flags; 126 int ret = 0; 127 128 entry = kzalloc(sizeof(*entry), GFP_KERNEL); 129 if (!entry) 130 return -ENOMEM; 131 132 entry->id = id; 133 entry->callback = event_cb; 134 entry->pdev = pdev; 135 136 spin_lock_irqsave(&dln2->event_cb_lock, flags); 137 138 list_for_each_entry(i, &dln2->event_cb_list, list) { 139 if (i->id == id) { 140 ret = -EBUSY; 141 break; 142 } 143 } 144 145 if (!ret) 146 list_add_rcu(&entry->list, &dln2->event_cb_list); 147 148 spin_unlock_irqrestore(&dln2->event_cb_lock, flags); 149 150 if (ret) 151 kfree(entry); 152 153 return ret; 154 } 155 EXPORT_SYMBOL(dln2_register_event_cb); 156 157 void dln2_unregister_event_cb(struct platform_device *pdev, u16 id) 158 { 159 struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); 160 struct dln2_event_cb_entry *i; 161 unsigned long flags; 162 bool found = false; 163 164 spin_lock_irqsave(&dln2->event_cb_lock, flags); 165 166 list_for_each_entry(i, &dln2->event_cb_list, list) { 167 if (i->id == id) { 168 list_del_rcu(&i->list); 169 found = true; 170 break; 171 } 172 } 173 174 spin_unlock_irqrestore(&dln2->event_cb_lock, flags); 175 176 if (found) { 177 synchronize_rcu(); 178 kfree(i); 179 } 180 } 181 EXPORT_SYMBOL(dln2_unregister_event_cb); 182 183 /* 184 * Returns true if a valid transfer slot is found. In this case the URB must not 185 * be resubmitted immediately in dln2_rx as we need the data when dln2_transfer 186 * is woke up. It will be resubmitted there. 187 */ 188 static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb, 189 u16 handle, u16 rx_slot) 190 { 191 struct device *dev = &dln2->interface->dev; 192 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; 193 struct dln2_rx_context *rxc; 194 unsigned long flags; 195 bool valid_slot = false; 196 197 if (rx_slot >= DLN2_MAX_RX_SLOTS) 198 goto out; 199 200 rxc = &rxs->slots[rx_slot]; 201 202 spin_lock_irqsave(&rxs->lock, flags); 203 if (rxc->in_use && !rxc->urb) { 204 rxc->urb = urb; 205 complete(&rxc->done); 206 valid_slot = true; 207 } 208 spin_unlock_irqrestore(&rxs->lock, flags); 209 210 out: 211 if (!valid_slot) 212 dev_warn(dev, "bad/late response %d/%d\n", handle, rx_slot); 213 214 return valid_slot; 215 } 216 217 static void dln2_run_event_callbacks(struct dln2_dev *dln2, u16 id, u16 echo, 218 void *data, int len) 219 { 220 struct dln2_event_cb_entry *i; 221 222 rcu_read_lock(); 223 224 list_for_each_entry_rcu(i, &dln2->event_cb_list, list) { 225 if (i->id == id) { 226 i->callback(i->pdev, echo, data, len); 227 break; 228 } 229 } 230 231 rcu_read_unlock(); 232 } 233 234 static void dln2_rx(struct urb *urb) 235 { 236 struct dln2_dev *dln2 = urb->context; 237 struct dln2_header *hdr = urb->transfer_buffer; 238 struct device *dev = &dln2->interface->dev; 239 u16 id, echo, handle, size; 240 u8 *data; 241 int len; 242 int err; 243 244 switch (urb->status) { 245 case 0: 246 /* success */ 247 break; 248 case -ECONNRESET: 249 case -ENOENT: 250 case -ESHUTDOWN: 251 case -EPIPE: 252 /* this urb is terminated, clean up */ 253 dev_dbg(dev, "urb shutting down with status %d\n", urb->status); 254 return; 255 default: 256 dev_dbg(dev, "nonzero urb status received %d\n", urb->status); 257 goto out; 258 } 259 260 if (urb->actual_length < sizeof(struct dln2_header)) { 261 dev_err(dev, "short response: %d\n", urb->actual_length); 262 goto out; 263 } 264 265 handle = le16_to_cpu(hdr->handle); 266 id = le16_to_cpu(hdr->id); 267 echo = le16_to_cpu(hdr->echo); 268 size = le16_to_cpu(hdr->size); 269 270 if (size != urb->actual_length) { 271 dev_err(dev, "size mismatch: handle %x cmd %x echo %x size %d actual %d\n", 272 handle, id, echo, size, urb->actual_length); 273 goto out; 274 } 275 276 if (handle >= DLN2_HANDLES) { 277 dev_warn(dev, "invalid handle %d\n", handle); 278 goto out; 279 } 280 281 data = urb->transfer_buffer + sizeof(struct dln2_header); 282 len = urb->actual_length - sizeof(struct dln2_header); 283 284 if (handle == DLN2_HANDLE_EVENT) { 285 dln2_run_event_callbacks(dln2, id, echo, data, len); 286 } else { 287 /* URB will be re-submitted in _dln2_transfer (free_rx_slot) */ 288 if (dln2_transfer_complete(dln2, urb, handle, echo)) 289 return; 290 } 291 292 out: 293 err = usb_submit_urb(urb, GFP_ATOMIC); 294 if (err < 0) 295 dev_err(dev, "failed to resubmit RX URB: %d\n", err); 296 } 297 298 static void *dln2_prep_buf(u16 handle, u16 cmd, u16 echo, const void *obuf, 299 int *obuf_len, gfp_t gfp) 300 { 301 int len; 302 void *buf; 303 struct dln2_header *hdr; 304 305 len = *obuf_len + sizeof(*hdr); 306 buf = kmalloc(len, gfp); 307 if (!buf) 308 return NULL; 309 310 hdr = (struct dln2_header *)buf; 311 hdr->id = cpu_to_le16(cmd); 312 hdr->size = cpu_to_le16(len); 313 hdr->echo = cpu_to_le16(echo); 314 hdr->handle = cpu_to_le16(handle); 315 316 memcpy(buf + sizeof(*hdr), obuf, *obuf_len); 317 318 *obuf_len = len; 319 320 return buf; 321 } 322 323 static int dln2_send_wait(struct dln2_dev *dln2, u16 handle, u16 cmd, u16 echo, 324 const void *obuf, int obuf_len) 325 { 326 int ret = 0; 327 int len = obuf_len; 328 void *buf; 329 int actual; 330 331 buf = dln2_prep_buf(handle, cmd, echo, obuf, &len, GFP_KERNEL); 332 if (!buf) 333 return -ENOMEM; 334 335 ret = usb_bulk_msg(dln2->usb_dev, 336 usb_sndbulkpipe(dln2->usb_dev, dln2->ep_out), 337 buf, len, &actual, DLN2_USB_TIMEOUT); 338 339 kfree(buf); 340 341 return ret; 342 } 343 344 static bool find_free_slot(struct dln2_dev *dln2, u16 handle, int *slot) 345 { 346 struct dln2_mod_rx_slots *rxs; 347 unsigned long flags; 348 349 if (dln2->disconnect) { 350 *slot = -ENODEV; 351 return true; 352 } 353 354 rxs = &dln2->mod_rx_slots[handle]; 355 356 spin_lock_irqsave(&rxs->lock, flags); 357 358 *slot = find_first_zero_bit(rxs->bmap, DLN2_MAX_RX_SLOTS); 359 360 if (*slot < DLN2_MAX_RX_SLOTS) { 361 struct dln2_rx_context *rxc = &rxs->slots[*slot]; 362 363 set_bit(*slot, rxs->bmap); 364 rxc->in_use = true; 365 } 366 367 spin_unlock_irqrestore(&rxs->lock, flags); 368 369 return *slot < DLN2_MAX_RX_SLOTS; 370 } 371 372 static int alloc_rx_slot(struct dln2_dev *dln2, u16 handle) 373 { 374 int ret; 375 int slot; 376 377 /* 378 * No need to timeout here, the wait is bounded by the timeout in 379 * _dln2_transfer. 380 */ 381 ret = wait_event_interruptible(dln2->mod_rx_slots[handle].wq, 382 find_free_slot(dln2, handle, &slot)); 383 if (ret < 0) 384 return ret; 385 386 return slot; 387 } 388 389 static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot) 390 { 391 struct dln2_mod_rx_slots *rxs; 392 struct urb *urb = NULL; 393 unsigned long flags; 394 struct dln2_rx_context *rxc; 395 396 rxs = &dln2->mod_rx_slots[handle]; 397 398 spin_lock_irqsave(&rxs->lock, flags); 399 400 clear_bit(slot, rxs->bmap); 401 402 rxc = &rxs->slots[slot]; 403 rxc->in_use = false; 404 urb = rxc->urb; 405 rxc->urb = NULL; 406 reinit_completion(&rxc->done); 407 408 spin_unlock_irqrestore(&rxs->lock, flags); 409 410 if (urb) { 411 int err; 412 struct device *dev = &dln2->interface->dev; 413 414 err = usb_submit_urb(urb, GFP_KERNEL); 415 if (err < 0) 416 dev_err(dev, "failed to resubmit RX URB: %d\n", err); 417 } 418 419 wake_up_interruptible(&rxs->wq); 420 } 421 422 static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd, 423 const void *obuf, unsigned obuf_len, 424 void *ibuf, unsigned *ibuf_len) 425 { 426 int ret = 0; 427 int rx_slot; 428 struct dln2_response *rsp; 429 struct dln2_rx_context *rxc; 430 struct device *dev = &dln2->interface->dev; 431 const unsigned long timeout = msecs_to_jiffies(DLN2_USB_TIMEOUT); 432 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; 433 int size; 434 435 spin_lock(&dln2->disconnect_lock); 436 if (!dln2->disconnect) 437 dln2->active_transfers++; 438 else 439 ret = -ENODEV; 440 spin_unlock(&dln2->disconnect_lock); 441 442 if (ret) 443 return ret; 444 445 rx_slot = alloc_rx_slot(dln2, handle); 446 if (rx_slot < 0) { 447 ret = rx_slot; 448 goto out_decr; 449 } 450 451 ret = dln2_send_wait(dln2, handle, cmd, rx_slot, obuf, obuf_len); 452 if (ret < 0) { 453 dev_err(dev, "USB write failed: %d\n", ret); 454 goto out_free_rx_slot; 455 } 456 457 rxc = &rxs->slots[rx_slot]; 458 459 ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout); 460 if (ret <= 0) { 461 if (!ret) 462 ret = -ETIMEDOUT; 463 goto out_free_rx_slot; 464 } else { 465 ret = 0; 466 } 467 468 if (dln2->disconnect) { 469 ret = -ENODEV; 470 goto out_free_rx_slot; 471 } 472 473 /* if we got here we know that the response header has been checked */ 474 rsp = rxc->urb->transfer_buffer; 475 size = le16_to_cpu(rsp->hdr.size); 476 477 if (size < sizeof(*rsp)) { 478 ret = -EPROTO; 479 goto out_free_rx_slot; 480 } 481 482 if (le16_to_cpu(rsp->result) > 0x80) { 483 dev_dbg(dev, "%d received response with error %d\n", 484 handle, le16_to_cpu(rsp->result)); 485 ret = -EREMOTEIO; 486 goto out_free_rx_slot; 487 } 488 489 if (!ibuf) 490 goto out_free_rx_slot; 491 492 if (*ibuf_len > size - sizeof(*rsp)) 493 *ibuf_len = size - sizeof(*rsp); 494 495 memcpy(ibuf, rsp + 1, *ibuf_len); 496 497 out_free_rx_slot: 498 free_rx_slot(dln2, handle, rx_slot); 499 out_decr: 500 spin_lock(&dln2->disconnect_lock); 501 dln2->active_transfers--; 502 spin_unlock(&dln2->disconnect_lock); 503 if (dln2->disconnect) 504 wake_up(&dln2->disconnect_wq); 505 506 return ret; 507 } 508 509 int dln2_transfer(struct platform_device *pdev, u16 cmd, 510 const void *obuf, unsigned obuf_len, 511 void *ibuf, unsigned *ibuf_len) 512 { 513 struct dln2_platform_data *dln2_pdata; 514 struct dln2_dev *dln2; 515 u16 handle; 516 517 dln2 = dev_get_drvdata(pdev->dev.parent); 518 dln2_pdata = dev_get_platdata(&pdev->dev); 519 handle = dln2_pdata->handle; 520 521 return _dln2_transfer(dln2, handle, cmd, obuf, obuf_len, ibuf, 522 ibuf_len); 523 } 524 EXPORT_SYMBOL(dln2_transfer); 525 526 static int dln2_check_hw(struct dln2_dev *dln2) 527 { 528 int ret; 529 __le32 hw_type; 530 int len = sizeof(hw_type); 531 532 ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_VER, 533 NULL, 0, &hw_type, &len); 534 if (ret < 0) 535 return ret; 536 if (len < sizeof(hw_type)) 537 return -EREMOTEIO; 538 539 if (le32_to_cpu(hw_type) != DLN2_HW_ID) { 540 dev_err(&dln2->interface->dev, "Device ID 0x%x not supported\n", 541 le32_to_cpu(hw_type)); 542 return -ENODEV; 543 } 544 545 return 0; 546 } 547 548 static int dln2_print_serialno(struct dln2_dev *dln2) 549 { 550 int ret; 551 __le32 serial_no; 552 int len = sizeof(serial_no); 553 struct device *dev = &dln2->interface->dev; 554 555 ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0, 556 &serial_no, &len); 557 if (ret < 0) 558 return ret; 559 if (len < sizeof(serial_no)) 560 return -EREMOTEIO; 561 562 dev_info(dev, "Diolan DLN2 serial %u\n", le32_to_cpu(serial_no)); 563 564 return 0; 565 } 566 567 static int dln2_hw_init(struct dln2_dev *dln2) 568 { 569 int ret; 570 571 ret = dln2_check_hw(dln2); 572 if (ret < 0) 573 return ret; 574 575 return dln2_print_serialno(dln2); 576 } 577 578 static void dln2_free_rx_urbs(struct dln2_dev *dln2) 579 { 580 int i; 581 582 for (i = 0; i < DLN2_MAX_URBS; i++) { 583 usb_free_urb(dln2->rx_urb[i]); 584 kfree(dln2->rx_buf[i]); 585 } 586 } 587 588 static void dln2_stop_rx_urbs(struct dln2_dev *dln2) 589 { 590 int i; 591 592 for (i = 0; i < DLN2_MAX_URBS; i++) 593 usb_kill_urb(dln2->rx_urb[i]); 594 } 595 596 static void dln2_free(struct dln2_dev *dln2) 597 { 598 dln2_free_rx_urbs(dln2); 599 usb_put_dev(dln2->usb_dev); 600 kfree(dln2); 601 } 602 603 static int dln2_setup_rx_urbs(struct dln2_dev *dln2, 604 struct usb_host_interface *hostif) 605 { 606 int i; 607 const int rx_max_size = DLN2_RX_BUF_SIZE; 608 609 for (i = 0; i < DLN2_MAX_URBS; i++) { 610 dln2->rx_buf[i] = kmalloc(rx_max_size, GFP_KERNEL); 611 if (!dln2->rx_buf[i]) 612 return -ENOMEM; 613 614 dln2->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL); 615 if (!dln2->rx_urb[i]) 616 return -ENOMEM; 617 618 usb_fill_bulk_urb(dln2->rx_urb[i], dln2->usb_dev, 619 usb_rcvbulkpipe(dln2->usb_dev, dln2->ep_in), 620 dln2->rx_buf[i], rx_max_size, dln2_rx, dln2); 621 } 622 623 return 0; 624 } 625 626 static int dln2_start_rx_urbs(struct dln2_dev *dln2, gfp_t gfp) 627 { 628 struct device *dev = &dln2->interface->dev; 629 int ret; 630 int i; 631 632 for (i = 0; i < DLN2_MAX_URBS; i++) { 633 ret = usb_submit_urb(dln2->rx_urb[i], gfp); 634 if (ret < 0) { 635 dev_err(dev, "failed to submit RX URB: %d\n", ret); 636 return ret; 637 } 638 } 639 640 return 0; 641 } 642 643 static struct dln2_platform_data dln2_pdata_gpio = { 644 .handle = DLN2_HANDLE_GPIO, 645 }; 646 647 /* Only one I2C port seems to be supported on current hardware */ 648 static struct dln2_platform_data dln2_pdata_i2c = { 649 .handle = DLN2_HANDLE_I2C, 650 .port = 0, 651 }; 652 653 /* Only one SPI port supported */ 654 static struct dln2_platform_data dln2_pdata_spi = { 655 .handle = DLN2_HANDLE_SPI, 656 .port = 0, 657 }; 658 659 static const struct mfd_cell dln2_devs[] = { 660 { 661 .name = "dln2-gpio", 662 .platform_data = &dln2_pdata_gpio, 663 .pdata_size = sizeof(struct dln2_platform_data), 664 }, 665 { 666 .name = "dln2-i2c", 667 .platform_data = &dln2_pdata_i2c, 668 .pdata_size = sizeof(struct dln2_platform_data), 669 }, 670 { 671 .name = "dln2-spi", 672 .platform_data = &dln2_pdata_spi, 673 .pdata_size = sizeof(struct dln2_platform_data), 674 }, 675 }; 676 677 static void dln2_stop(struct dln2_dev *dln2) 678 { 679 int i, j; 680 681 /* don't allow starting new transfers */ 682 spin_lock(&dln2->disconnect_lock); 683 dln2->disconnect = true; 684 spin_unlock(&dln2->disconnect_lock); 685 686 /* cancel in progress transfers */ 687 for (i = 0; i < DLN2_HANDLES; i++) { 688 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[i]; 689 unsigned long flags; 690 691 spin_lock_irqsave(&rxs->lock, flags); 692 693 /* cancel all response waiters */ 694 for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) { 695 struct dln2_rx_context *rxc = &rxs->slots[j]; 696 697 if (rxc->in_use) 698 complete(&rxc->done); 699 } 700 701 spin_unlock_irqrestore(&rxs->lock, flags); 702 } 703 704 /* wait for transfers to end */ 705 wait_event(dln2->disconnect_wq, !dln2->active_transfers); 706 707 dln2_stop_rx_urbs(dln2); 708 } 709 710 static void dln2_disconnect(struct usb_interface *interface) 711 { 712 struct dln2_dev *dln2 = usb_get_intfdata(interface); 713 714 dln2_stop(dln2); 715 716 mfd_remove_devices(&interface->dev); 717 718 dln2_free(dln2); 719 } 720 721 static int dln2_probe(struct usb_interface *interface, 722 const struct usb_device_id *usb_id) 723 { 724 struct usb_host_interface *hostif = interface->cur_altsetting; 725 struct device *dev = &interface->dev; 726 struct dln2_dev *dln2; 727 int ret; 728 int i, j; 729 730 if (hostif->desc.bInterfaceNumber != 0 || 731 hostif->desc.bNumEndpoints < 2) 732 return -ENODEV; 733 734 dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL); 735 if (!dln2) 736 return -ENOMEM; 737 738 dln2->ep_out = hostif->endpoint[0].desc.bEndpointAddress; 739 dln2->ep_in = hostif->endpoint[1].desc.bEndpointAddress; 740 dln2->usb_dev = usb_get_dev(interface_to_usbdev(interface)); 741 dln2->interface = interface; 742 usb_set_intfdata(interface, dln2); 743 init_waitqueue_head(&dln2->disconnect_wq); 744 745 for (i = 0; i < DLN2_HANDLES; i++) { 746 init_waitqueue_head(&dln2->mod_rx_slots[i].wq); 747 spin_lock_init(&dln2->mod_rx_slots[i].lock); 748 for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) 749 init_completion(&dln2->mod_rx_slots[i].slots[j].done); 750 } 751 752 spin_lock_init(&dln2->event_cb_lock); 753 spin_lock_init(&dln2->disconnect_lock); 754 INIT_LIST_HEAD(&dln2->event_cb_list); 755 756 ret = dln2_setup_rx_urbs(dln2, hostif); 757 if (ret) 758 goto out_free; 759 760 ret = dln2_start_rx_urbs(dln2, GFP_KERNEL); 761 if (ret) 762 goto out_stop_rx; 763 764 ret = dln2_hw_init(dln2); 765 if (ret < 0) { 766 dev_err(dev, "failed to initialize hardware\n"); 767 goto out_stop_rx; 768 } 769 770 ret = mfd_add_hotplug_devices(dev, dln2_devs, ARRAY_SIZE(dln2_devs)); 771 if (ret != 0) { 772 dev_err(dev, "failed to add mfd devices to core\n"); 773 goto out_stop_rx; 774 } 775 776 return 0; 777 778 out_stop_rx: 779 dln2_stop_rx_urbs(dln2); 780 781 out_free: 782 dln2_free(dln2); 783 784 return ret; 785 } 786 787 static int dln2_suspend(struct usb_interface *iface, pm_message_t message) 788 { 789 struct dln2_dev *dln2 = usb_get_intfdata(iface); 790 791 dln2_stop(dln2); 792 793 return 0; 794 } 795 796 static int dln2_resume(struct usb_interface *iface) 797 { 798 struct dln2_dev *dln2 = usb_get_intfdata(iface); 799 800 dln2->disconnect = false; 801 802 return dln2_start_rx_urbs(dln2, GFP_NOIO); 803 } 804 805 static const struct usb_device_id dln2_table[] = { 806 { USB_DEVICE(0xa257, 0x2013) }, 807 { } 808 }; 809 810 MODULE_DEVICE_TABLE(usb, dln2_table); 811 812 static struct usb_driver dln2_driver = { 813 .name = "dln2", 814 .probe = dln2_probe, 815 .disconnect = dln2_disconnect, 816 .id_table = dln2_table, 817 .suspend = dln2_suspend, 818 .resume = dln2_resume, 819 }; 820 821 module_usb_driver(dln2_driver); 822 823 MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>"); 824 MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter"); 825 MODULE_LICENSE("GPL v2"); 826