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 enum dln2_endpoint { 94 DLN2_EP_OUT = 0, 95 DLN2_EP_IN = 1, 96 }; 97 98 struct dln2_dev { 99 struct usb_device *usb_dev; 100 struct usb_interface *interface; 101 u8 ep_in; 102 u8 ep_out; 103 104 struct urb *rx_urb[DLN2_MAX_URBS]; 105 void *rx_buf[DLN2_MAX_URBS]; 106 107 struct dln2_mod_rx_slots mod_rx_slots[DLN2_HANDLES]; 108 109 struct list_head event_cb_list; 110 spinlock_t event_cb_lock; 111 112 bool disconnect; 113 int active_transfers; 114 wait_queue_head_t disconnect_wq; 115 spinlock_t disconnect_lock; 116 }; 117 118 struct dln2_event_cb_entry { 119 struct list_head list; 120 u16 id; 121 struct platform_device *pdev; 122 dln2_event_cb_t callback; 123 }; 124 125 int dln2_register_event_cb(struct platform_device *pdev, u16 id, 126 dln2_event_cb_t event_cb) 127 { 128 struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); 129 struct dln2_event_cb_entry *i, *entry; 130 unsigned long flags; 131 int ret = 0; 132 133 entry = kzalloc(sizeof(*entry), GFP_KERNEL); 134 if (!entry) 135 return -ENOMEM; 136 137 entry->id = id; 138 entry->callback = event_cb; 139 entry->pdev = pdev; 140 141 spin_lock_irqsave(&dln2->event_cb_lock, flags); 142 143 list_for_each_entry(i, &dln2->event_cb_list, list) { 144 if (i->id == id) { 145 ret = -EBUSY; 146 break; 147 } 148 } 149 150 if (!ret) 151 list_add_rcu(&entry->list, &dln2->event_cb_list); 152 153 spin_unlock_irqrestore(&dln2->event_cb_lock, flags); 154 155 if (ret) 156 kfree(entry); 157 158 return ret; 159 } 160 EXPORT_SYMBOL(dln2_register_event_cb); 161 162 void dln2_unregister_event_cb(struct platform_device *pdev, u16 id) 163 { 164 struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); 165 struct dln2_event_cb_entry *i; 166 unsigned long flags; 167 bool found = false; 168 169 spin_lock_irqsave(&dln2->event_cb_lock, flags); 170 171 list_for_each_entry(i, &dln2->event_cb_list, list) { 172 if (i->id == id) { 173 list_del_rcu(&i->list); 174 found = true; 175 break; 176 } 177 } 178 179 spin_unlock_irqrestore(&dln2->event_cb_lock, flags); 180 181 if (found) { 182 synchronize_rcu(); 183 kfree(i); 184 } 185 } 186 EXPORT_SYMBOL(dln2_unregister_event_cb); 187 188 /* 189 * Returns true if a valid transfer slot is found. In this case the URB must not 190 * be resubmitted immediately in dln2_rx as we need the data when dln2_transfer 191 * is woke up. It will be resubmitted there. 192 */ 193 static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb, 194 u16 handle, u16 rx_slot) 195 { 196 struct device *dev = &dln2->interface->dev; 197 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; 198 struct dln2_rx_context *rxc; 199 unsigned long flags; 200 bool valid_slot = false; 201 202 if (rx_slot >= DLN2_MAX_RX_SLOTS) 203 goto out; 204 205 rxc = &rxs->slots[rx_slot]; 206 207 spin_lock_irqsave(&rxs->lock, flags); 208 if (rxc->in_use && !rxc->urb) { 209 rxc->urb = urb; 210 complete(&rxc->done); 211 valid_slot = true; 212 } 213 spin_unlock_irqrestore(&rxs->lock, flags); 214 215 out: 216 if (!valid_slot) 217 dev_warn(dev, "bad/late response %d/%d\n", handle, rx_slot); 218 219 return valid_slot; 220 } 221 222 static void dln2_run_event_callbacks(struct dln2_dev *dln2, u16 id, u16 echo, 223 void *data, int len) 224 { 225 struct dln2_event_cb_entry *i; 226 227 rcu_read_lock(); 228 229 list_for_each_entry_rcu(i, &dln2->event_cb_list, list) { 230 if (i->id == id) { 231 i->callback(i->pdev, echo, data, len); 232 break; 233 } 234 } 235 236 rcu_read_unlock(); 237 } 238 239 static void dln2_rx(struct urb *urb) 240 { 241 struct dln2_dev *dln2 = urb->context; 242 struct dln2_header *hdr = urb->transfer_buffer; 243 struct device *dev = &dln2->interface->dev; 244 u16 id, echo, handle, size; 245 u8 *data; 246 int len; 247 int err; 248 249 switch (urb->status) { 250 case 0: 251 /* success */ 252 break; 253 case -ECONNRESET: 254 case -ENOENT: 255 case -ESHUTDOWN: 256 case -EPIPE: 257 /* this urb is terminated, clean up */ 258 dev_dbg(dev, "urb shutting down with status %d\n", urb->status); 259 return; 260 default: 261 dev_dbg(dev, "nonzero urb status received %d\n", urb->status); 262 goto out; 263 } 264 265 if (urb->actual_length < sizeof(struct dln2_header)) { 266 dev_err(dev, "short response: %d\n", urb->actual_length); 267 goto out; 268 } 269 270 handle = le16_to_cpu(hdr->handle); 271 id = le16_to_cpu(hdr->id); 272 echo = le16_to_cpu(hdr->echo); 273 size = le16_to_cpu(hdr->size); 274 275 if (size != urb->actual_length) { 276 dev_err(dev, "size mismatch: handle %x cmd %x echo %x size %d actual %d\n", 277 handle, id, echo, size, urb->actual_length); 278 goto out; 279 } 280 281 if (handle >= DLN2_HANDLES) { 282 dev_warn(dev, "invalid handle %d\n", handle); 283 goto out; 284 } 285 286 data = urb->transfer_buffer + sizeof(struct dln2_header); 287 len = urb->actual_length - sizeof(struct dln2_header); 288 289 if (handle == DLN2_HANDLE_EVENT) { 290 dln2_run_event_callbacks(dln2, id, echo, data, len); 291 } else { 292 /* URB will be re-submitted in _dln2_transfer (free_rx_slot) */ 293 if (dln2_transfer_complete(dln2, urb, handle, echo)) 294 return; 295 } 296 297 out: 298 err = usb_submit_urb(urb, GFP_ATOMIC); 299 if (err < 0) 300 dev_err(dev, "failed to resubmit RX URB: %d\n", err); 301 } 302 303 static void *dln2_prep_buf(u16 handle, u16 cmd, u16 echo, const void *obuf, 304 int *obuf_len, gfp_t gfp) 305 { 306 int len; 307 void *buf; 308 struct dln2_header *hdr; 309 310 len = *obuf_len + sizeof(*hdr); 311 buf = kmalloc(len, gfp); 312 if (!buf) 313 return NULL; 314 315 hdr = (struct dln2_header *)buf; 316 hdr->id = cpu_to_le16(cmd); 317 hdr->size = cpu_to_le16(len); 318 hdr->echo = cpu_to_le16(echo); 319 hdr->handle = cpu_to_le16(handle); 320 321 memcpy(buf + sizeof(*hdr), obuf, *obuf_len); 322 323 *obuf_len = len; 324 325 return buf; 326 } 327 328 static int dln2_send_wait(struct dln2_dev *dln2, u16 handle, u16 cmd, u16 echo, 329 const void *obuf, int obuf_len) 330 { 331 int ret = 0; 332 int len = obuf_len; 333 void *buf; 334 int actual; 335 336 buf = dln2_prep_buf(handle, cmd, echo, obuf, &len, GFP_KERNEL); 337 if (!buf) 338 return -ENOMEM; 339 340 ret = usb_bulk_msg(dln2->usb_dev, 341 usb_sndbulkpipe(dln2->usb_dev, dln2->ep_out), 342 buf, len, &actual, DLN2_USB_TIMEOUT); 343 344 kfree(buf); 345 346 return ret; 347 } 348 349 static bool find_free_slot(struct dln2_dev *dln2, u16 handle, int *slot) 350 { 351 struct dln2_mod_rx_slots *rxs; 352 unsigned long flags; 353 354 if (dln2->disconnect) { 355 *slot = -ENODEV; 356 return true; 357 } 358 359 rxs = &dln2->mod_rx_slots[handle]; 360 361 spin_lock_irqsave(&rxs->lock, flags); 362 363 *slot = find_first_zero_bit(rxs->bmap, DLN2_MAX_RX_SLOTS); 364 365 if (*slot < DLN2_MAX_RX_SLOTS) { 366 struct dln2_rx_context *rxc = &rxs->slots[*slot]; 367 368 set_bit(*slot, rxs->bmap); 369 rxc->in_use = true; 370 } 371 372 spin_unlock_irqrestore(&rxs->lock, flags); 373 374 return *slot < DLN2_MAX_RX_SLOTS; 375 } 376 377 static int alloc_rx_slot(struct dln2_dev *dln2, u16 handle) 378 { 379 int ret; 380 int slot; 381 382 /* 383 * No need to timeout here, the wait is bounded by the timeout in 384 * _dln2_transfer. 385 */ 386 ret = wait_event_interruptible(dln2->mod_rx_slots[handle].wq, 387 find_free_slot(dln2, handle, &slot)); 388 if (ret < 0) 389 return ret; 390 391 return slot; 392 } 393 394 static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot) 395 { 396 struct dln2_mod_rx_slots *rxs; 397 struct urb *urb = NULL; 398 unsigned long flags; 399 struct dln2_rx_context *rxc; 400 401 rxs = &dln2->mod_rx_slots[handle]; 402 403 spin_lock_irqsave(&rxs->lock, flags); 404 405 clear_bit(slot, rxs->bmap); 406 407 rxc = &rxs->slots[slot]; 408 rxc->in_use = false; 409 urb = rxc->urb; 410 rxc->urb = NULL; 411 reinit_completion(&rxc->done); 412 413 spin_unlock_irqrestore(&rxs->lock, flags); 414 415 if (urb) { 416 int err; 417 struct device *dev = &dln2->interface->dev; 418 419 err = usb_submit_urb(urb, GFP_KERNEL); 420 if (err < 0) 421 dev_err(dev, "failed to resubmit RX URB: %d\n", err); 422 } 423 424 wake_up_interruptible(&rxs->wq); 425 } 426 427 static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd, 428 const void *obuf, unsigned obuf_len, 429 void *ibuf, unsigned *ibuf_len) 430 { 431 int ret = 0; 432 int rx_slot; 433 struct dln2_response *rsp; 434 struct dln2_rx_context *rxc; 435 struct device *dev = &dln2->interface->dev; 436 const unsigned long timeout = msecs_to_jiffies(DLN2_USB_TIMEOUT); 437 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; 438 int size; 439 440 spin_lock(&dln2->disconnect_lock); 441 if (!dln2->disconnect) 442 dln2->active_transfers++; 443 else 444 ret = -ENODEV; 445 spin_unlock(&dln2->disconnect_lock); 446 447 if (ret) 448 return ret; 449 450 rx_slot = alloc_rx_slot(dln2, handle); 451 if (rx_slot < 0) { 452 ret = rx_slot; 453 goto out_decr; 454 } 455 456 ret = dln2_send_wait(dln2, handle, cmd, rx_slot, obuf, obuf_len); 457 if (ret < 0) { 458 dev_err(dev, "USB write failed: %d\n", ret); 459 goto out_free_rx_slot; 460 } 461 462 rxc = &rxs->slots[rx_slot]; 463 464 ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout); 465 if (ret <= 0) { 466 if (!ret) 467 ret = -ETIMEDOUT; 468 goto out_free_rx_slot; 469 } else { 470 ret = 0; 471 } 472 473 if (dln2->disconnect) { 474 ret = -ENODEV; 475 goto out_free_rx_slot; 476 } 477 478 /* if we got here we know that the response header has been checked */ 479 rsp = rxc->urb->transfer_buffer; 480 size = le16_to_cpu(rsp->hdr.size); 481 482 if (size < sizeof(*rsp)) { 483 ret = -EPROTO; 484 goto out_free_rx_slot; 485 } 486 487 if (le16_to_cpu(rsp->result) > 0x80) { 488 dev_dbg(dev, "%d received response with error %d\n", 489 handle, le16_to_cpu(rsp->result)); 490 ret = -EREMOTEIO; 491 goto out_free_rx_slot; 492 } 493 494 if (!ibuf) 495 goto out_free_rx_slot; 496 497 if (*ibuf_len > size - sizeof(*rsp)) 498 *ibuf_len = size - sizeof(*rsp); 499 500 memcpy(ibuf, rsp + 1, *ibuf_len); 501 502 out_free_rx_slot: 503 free_rx_slot(dln2, handle, rx_slot); 504 out_decr: 505 spin_lock(&dln2->disconnect_lock); 506 dln2->active_transfers--; 507 spin_unlock(&dln2->disconnect_lock); 508 if (dln2->disconnect) 509 wake_up(&dln2->disconnect_wq); 510 511 return ret; 512 } 513 514 int dln2_transfer(struct platform_device *pdev, u16 cmd, 515 const void *obuf, unsigned obuf_len, 516 void *ibuf, unsigned *ibuf_len) 517 { 518 struct dln2_platform_data *dln2_pdata; 519 struct dln2_dev *dln2; 520 u16 handle; 521 522 dln2 = dev_get_drvdata(pdev->dev.parent); 523 dln2_pdata = dev_get_platdata(&pdev->dev); 524 handle = dln2_pdata->handle; 525 526 return _dln2_transfer(dln2, handle, cmd, obuf, obuf_len, ibuf, 527 ibuf_len); 528 } 529 EXPORT_SYMBOL(dln2_transfer); 530 531 static int dln2_check_hw(struct dln2_dev *dln2) 532 { 533 int ret; 534 __le32 hw_type; 535 int len = sizeof(hw_type); 536 537 ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_VER, 538 NULL, 0, &hw_type, &len); 539 if (ret < 0) 540 return ret; 541 if (len < sizeof(hw_type)) 542 return -EREMOTEIO; 543 544 if (le32_to_cpu(hw_type) != DLN2_HW_ID) { 545 dev_err(&dln2->interface->dev, "Device ID 0x%x not supported\n", 546 le32_to_cpu(hw_type)); 547 return -ENODEV; 548 } 549 550 return 0; 551 } 552 553 static int dln2_print_serialno(struct dln2_dev *dln2) 554 { 555 int ret; 556 __le32 serial_no; 557 int len = sizeof(serial_no); 558 struct device *dev = &dln2->interface->dev; 559 560 ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0, 561 &serial_no, &len); 562 if (ret < 0) 563 return ret; 564 if (len < sizeof(serial_no)) 565 return -EREMOTEIO; 566 567 dev_info(dev, "Diolan DLN2 serial %u\n", le32_to_cpu(serial_no)); 568 569 return 0; 570 } 571 572 static int dln2_hw_init(struct dln2_dev *dln2) 573 { 574 int ret; 575 576 ret = dln2_check_hw(dln2); 577 if (ret < 0) 578 return ret; 579 580 return dln2_print_serialno(dln2); 581 } 582 583 static void dln2_free_rx_urbs(struct dln2_dev *dln2) 584 { 585 int i; 586 587 for (i = 0; i < DLN2_MAX_URBS; i++) { 588 usb_free_urb(dln2->rx_urb[i]); 589 kfree(dln2->rx_buf[i]); 590 } 591 } 592 593 static void dln2_stop_rx_urbs(struct dln2_dev *dln2) 594 { 595 int i; 596 597 for (i = 0; i < DLN2_MAX_URBS; i++) 598 usb_kill_urb(dln2->rx_urb[i]); 599 } 600 601 static void dln2_free(struct dln2_dev *dln2) 602 { 603 dln2_free_rx_urbs(dln2); 604 usb_put_dev(dln2->usb_dev); 605 kfree(dln2); 606 } 607 608 static int dln2_setup_rx_urbs(struct dln2_dev *dln2, 609 struct usb_host_interface *hostif) 610 { 611 int i; 612 const int rx_max_size = DLN2_RX_BUF_SIZE; 613 614 for (i = 0; i < DLN2_MAX_URBS; i++) { 615 dln2->rx_buf[i] = kmalloc(rx_max_size, GFP_KERNEL); 616 if (!dln2->rx_buf[i]) 617 return -ENOMEM; 618 619 dln2->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL); 620 if (!dln2->rx_urb[i]) 621 return -ENOMEM; 622 623 usb_fill_bulk_urb(dln2->rx_urb[i], dln2->usb_dev, 624 usb_rcvbulkpipe(dln2->usb_dev, dln2->ep_in), 625 dln2->rx_buf[i], rx_max_size, dln2_rx, dln2); 626 } 627 628 return 0; 629 } 630 631 static int dln2_start_rx_urbs(struct dln2_dev *dln2, gfp_t gfp) 632 { 633 struct device *dev = &dln2->interface->dev; 634 int ret; 635 int i; 636 637 for (i = 0; i < DLN2_MAX_URBS; i++) { 638 ret = usb_submit_urb(dln2->rx_urb[i], gfp); 639 if (ret < 0) { 640 dev_err(dev, "failed to submit RX URB: %d\n", ret); 641 return ret; 642 } 643 } 644 645 return 0; 646 } 647 648 enum { 649 DLN2_ACPI_MATCH_GPIO = 0, 650 DLN2_ACPI_MATCH_I2C = 1, 651 DLN2_ACPI_MATCH_SPI = 2, 652 }; 653 654 static struct dln2_platform_data dln2_pdata_gpio = { 655 .handle = DLN2_HANDLE_GPIO, 656 }; 657 658 static struct mfd_cell_acpi_match dln2_acpi_match_gpio = { 659 .adr = DLN2_ACPI_MATCH_GPIO, 660 }; 661 662 /* Only one I2C port seems to be supported on current hardware */ 663 static struct dln2_platform_data dln2_pdata_i2c = { 664 .handle = DLN2_HANDLE_I2C, 665 .port = 0, 666 }; 667 668 static struct mfd_cell_acpi_match dln2_acpi_match_i2c = { 669 .adr = DLN2_ACPI_MATCH_I2C, 670 }; 671 672 /* Only one SPI port supported */ 673 static struct dln2_platform_data dln2_pdata_spi = { 674 .handle = DLN2_HANDLE_SPI, 675 .port = 0, 676 }; 677 678 static struct mfd_cell_acpi_match dln2_acpi_match_spi = { 679 .adr = DLN2_ACPI_MATCH_SPI, 680 }; 681 682 static const struct mfd_cell dln2_devs[] = { 683 { 684 .name = "dln2-gpio", 685 .acpi_match = &dln2_acpi_match_gpio, 686 .platform_data = &dln2_pdata_gpio, 687 .pdata_size = sizeof(struct dln2_platform_data), 688 }, 689 { 690 .name = "dln2-i2c", 691 .acpi_match = &dln2_acpi_match_i2c, 692 .platform_data = &dln2_pdata_i2c, 693 .pdata_size = sizeof(struct dln2_platform_data), 694 }, 695 { 696 .name = "dln2-spi", 697 .acpi_match = &dln2_acpi_match_spi, 698 .platform_data = &dln2_pdata_spi, 699 .pdata_size = sizeof(struct dln2_platform_data), 700 }, 701 }; 702 703 static void dln2_stop(struct dln2_dev *dln2) 704 { 705 int i, j; 706 707 /* don't allow starting new transfers */ 708 spin_lock(&dln2->disconnect_lock); 709 dln2->disconnect = true; 710 spin_unlock(&dln2->disconnect_lock); 711 712 /* cancel in progress transfers */ 713 for (i = 0; i < DLN2_HANDLES; i++) { 714 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[i]; 715 unsigned long flags; 716 717 spin_lock_irqsave(&rxs->lock, flags); 718 719 /* cancel all response waiters */ 720 for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) { 721 struct dln2_rx_context *rxc = &rxs->slots[j]; 722 723 if (rxc->in_use) 724 complete(&rxc->done); 725 } 726 727 spin_unlock_irqrestore(&rxs->lock, flags); 728 } 729 730 /* wait for transfers to end */ 731 wait_event(dln2->disconnect_wq, !dln2->active_transfers); 732 733 dln2_stop_rx_urbs(dln2); 734 } 735 736 static void dln2_disconnect(struct usb_interface *interface) 737 { 738 struct dln2_dev *dln2 = usb_get_intfdata(interface); 739 740 dln2_stop(dln2); 741 742 mfd_remove_devices(&interface->dev); 743 744 dln2_free(dln2); 745 } 746 747 static int dln2_probe(struct usb_interface *interface, 748 const struct usb_device_id *usb_id) 749 { 750 struct usb_host_interface *hostif = interface->cur_altsetting; 751 struct usb_endpoint_descriptor *epin; 752 struct usb_endpoint_descriptor *epout; 753 struct device *dev = &interface->dev; 754 struct dln2_dev *dln2; 755 int ret; 756 int i, j; 757 758 if (hostif->desc.bInterfaceNumber != 0 || 759 hostif->desc.bNumEndpoints < 2) 760 return -ENODEV; 761 762 epout = &hostif->endpoint[DLN2_EP_OUT].desc; 763 if (!usb_endpoint_is_bulk_out(epout)) 764 return -ENODEV; 765 epin = &hostif->endpoint[DLN2_EP_IN].desc; 766 if (!usb_endpoint_is_bulk_in(epin)) 767 return -ENODEV; 768 769 dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL); 770 if (!dln2) 771 return -ENOMEM; 772 773 dln2->ep_out = epout->bEndpointAddress; 774 dln2->ep_in = epin->bEndpointAddress; 775 dln2->usb_dev = usb_get_dev(interface_to_usbdev(interface)); 776 dln2->interface = interface; 777 usb_set_intfdata(interface, dln2); 778 init_waitqueue_head(&dln2->disconnect_wq); 779 780 for (i = 0; i < DLN2_HANDLES; i++) { 781 init_waitqueue_head(&dln2->mod_rx_slots[i].wq); 782 spin_lock_init(&dln2->mod_rx_slots[i].lock); 783 for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) 784 init_completion(&dln2->mod_rx_slots[i].slots[j].done); 785 } 786 787 spin_lock_init(&dln2->event_cb_lock); 788 spin_lock_init(&dln2->disconnect_lock); 789 INIT_LIST_HEAD(&dln2->event_cb_list); 790 791 ret = dln2_setup_rx_urbs(dln2, hostif); 792 if (ret) 793 goto out_free; 794 795 ret = dln2_start_rx_urbs(dln2, GFP_KERNEL); 796 if (ret) 797 goto out_stop_rx; 798 799 ret = dln2_hw_init(dln2); 800 if (ret < 0) { 801 dev_err(dev, "failed to initialize hardware\n"); 802 goto out_stop_rx; 803 } 804 805 ret = mfd_add_hotplug_devices(dev, dln2_devs, ARRAY_SIZE(dln2_devs)); 806 if (ret != 0) { 807 dev_err(dev, "failed to add mfd devices to core\n"); 808 goto out_stop_rx; 809 } 810 811 return 0; 812 813 out_stop_rx: 814 dln2_stop_rx_urbs(dln2); 815 816 out_free: 817 dln2_free(dln2); 818 819 return ret; 820 } 821 822 static int dln2_suspend(struct usb_interface *iface, pm_message_t message) 823 { 824 struct dln2_dev *dln2 = usb_get_intfdata(iface); 825 826 dln2_stop(dln2); 827 828 return 0; 829 } 830 831 static int dln2_resume(struct usb_interface *iface) 832 { 833 struct dln2_dev *dln2 = usb_get_intfdata(iface); 834 835 dln2->disconnect = false; 836 837 return dln2_start_rx_urbs(dln2, GFP_NOIO); 838 } 839 840 static const struct usb_device_id dln2_table[] = { 841 { USB_DEVICE(0xa257, 0x2013) }, 842 { } 843 }; 844 845 MODULE_DEVICE_TABLE(usb, dln2_table); 846 847 static struct usb_driver dln2_driver = { 848 .name = "dln2", 849 .probe = dln2_probe, 850 .disconnect = dln2_disconnect, 851 .id_table = dln2_table, 852 .suspend = dln2_suspend, 853 .resume = dln2_resume, 854 }; 855 856 module_usb_driver(dln2_driver); 857 858 MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>"); 859 MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter"); 860 MODULE_LICENSE("GPL v2"); 861