1/* ZD1211 USB-WLAN driver for Linux 2 * 3 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de> 4 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org> 5 * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21#include <linux/kernel.h> 22#include <linux/init.h> 23#include <linux/firmware.h> 24#include <linux/device.h> 25#include <linux/errno.h> 26#include <linux/slab.h> 27#include <linux/skbuff.h> 28#include <linux/usb.h> 29#include <linux/workqueue.h> 30#include <linux/module.h> 31#include <net/mac80211.h> 32#include <asm/unaligned.h> 33 34#include "zd_def.h" 35#include "zd_mac.h" 36#include "zd_usb.h" 37 38static struct usb_device_id usb_ids[] = { 39 /* ZD1211 */ 40 { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 }, 41 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 }, 42 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 }, 43 { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 }, 44 { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 }, 45 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 }, 46 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 }, 47 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 }, 48 { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 }, 49 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 }, 50 { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 }, 51 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 }, 52 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 }, 53 { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 }, 54 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 }, 55 { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 }, 56 { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 }, 57 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 }, 58 { USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 }, 59 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 }, 60 { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 }, 61 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 }, 62 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 }, 63 { USB_DEVICE(0x157e, 0x3207), .driver_info = DEVICE_ZD1211 }, 64 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 }, 65 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 }, 66 /* ZD1211B */ 67 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B }, 68 { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B }, 69 { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B }, 70 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B }, 71 { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B }, 72 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B }, 73 { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B }, 74 { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B }, 75 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B }, 76 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B }, 77 { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B }, 78 { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B }, 79 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B }, 80 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B }, 81 { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B }, 82 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B }, 83 { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B }, 84 { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B }, 85 { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B }, 86 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B }, 87 { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B }, 88 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B }, 89 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B }, 90 { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B }, 91 { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B }, 92 { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B }, 93 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B }, 94 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B }, 95 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B }, 96 { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B }, 97 { USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B }, 98 /* "Driverless" devices that need ejecting */ 99 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER }, 100 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER }, 101 {} 102}; 103 104MODULE_LICENSE("GPL"); 105MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip."); 106MODULE_AUTHOR("Ulrich Kunitz"); 107MODULE_AUTHOR("Daniel Drake"); 108MODULE_VERSION("1.0"); 109MODULE_DEVICE_TABLE(usb, usb_ids); 110 111#define FW_ZD1211_PREFIX "zd1211/zd1211_" 112#define FW_ZD1211B_PREFIX "zd1211/zd1211b_" 113 114static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req, 115 unsigned int count); 116 117/* USB device initialization */ 118static void int_urb_complete(struct urb *urb); 119 120static int request_fw_file( 121 const struct firmware **fw, const char *name, struct device *device) 122{ 123 int r; 124 125 dev_dbg_f(device, "fw name %s\n", name); 126 127 r = request_firmware(fw, name, device); 128 if (r) 129 dev_err(device, 130 "Could not load firmware file %s. Error number %d\n", 131 name, r); 132 return r; 133} 134 135static inline u16 get_bcdDevice(const struct usb_device *udev) 136{ 137 return le16_to_cpu(udev->descriptor.bcdDevice); 138} 139 140enum upload_code_flags { 141 REBOOT = 1, 142}; 143 144/* Ensures that MAX_TRANSFER_SIZE is even. */ 145#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1) 146 147static int upload_code(struct usb_device *udev, 148 const u8 *data, size_t size, u16 code_offset, int flags) 149{ 150 u8 *p; 151 int r; 152 153 /* USB request blocks need "kmalloced" buffers. 154 */ 155 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL); 156 if (!p) { 157 r = -ENOMEM; 158 goto error; 159 } 160 161 size &= ~1; 162 while (size > 0) { 163 size_t transfer_size = size <= MAX_TRANSFER_SIZE ? 164 size : MAX_TRANSFER_SIZE; 165 166 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size); 167 168 memcpy(p, data, transfer_size); 169 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 170 USB_REQ_FIRMWARE_DOWNLOAD, 171 USB_DIR_OUT | USB_TYPE_VENDOR, 172 code_offset, 0, p, transfer_size, 1000 /* ms */); 173 if (r < 0) { 174 dev_err(&udev->dev, 175 "USB control request for firmware upload" 176 " failed. Error number %d\n", r); 177 goto error; 178 } 179 transfer_size = r & ~1; 180 181 size -= transfer_size; 182 data += transfer_size; 183 code_offset += transfer_size/sizeof(u16); 184 } 185 186 if (flags & REBOOT) { 187 u8 ret; 188 189 /* Use "DMA-aware" buffer. */ 190 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 191 USB_REQ_FIRMWARE_CONFIRM, 192 USB_DIR_IN | USB_TYPE_VENDOR, 193 0, 0, p, sizeof(ret), 5000 /* ms */); 194 if (r != sizeof(ret)) { 195 dev_err(&udev->dev, 196 "control request firmeware confirmation failed." 197 " Return value %d\n", r); 198 if (r >= 0) 199 r = -ENODEV; 200 goto error; 201 } 202 ret = p[0]; 203 if (ret & 0x80) { 204 dev_err(&udev->dev, 205 "Internal error while downloading." 206 " Firmware confirm return value %#04x\n", 207 (unsigned int)ret); 208 r = -ENODEV; 209 goto error; 210 } 211 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n", 212 (unsigned int)ret); 213 } 214 215 r = 0; 216error: 217 kfree(p); 218 return r; 219} 220 221static u16 get_word(const void *data, u16 offset) 222{ 223 const __le16 *p = data; 224 return le16_to_cpu(p[offset]); 225} 226 227static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size, 228 const char* postfix) 229{ 230 scnprintf(buffer, size, "%s%s", 231 usb->is_zd1211b ? 232 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX, 233 postfix); 234 return buffer; 235} 236 237static int handle_version_mismatch(struct zd_usb *usb, 238 const struct firmware *ub_fw) 239{ 240 struct usb_device *udev = zd_usb_to_usbdev(usb); 241 const struct firmware *ur_fw = NULL; 242 int offset; 243 int r = 0; 244 char fw_name[128]; 245 246 r = request_fw_file(&ur_fw, 247 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"), 248 &udev->dev); 249 if (r) 250 goto error; 251 252 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT); 253 if (r) 254 goto error; 255 256 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16)); 257 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset, 258 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT); 259 260 /* At this point, the vendor driver downloads the whole firmware 261 * image, hacks around with version IDs, and uploads it again, 262 * completely overwriting the boot code. We do not do this here as 263 * it is not required on any tested devices, and it is suspected to 264 * cause problems. */ 265error: 266 release_firmware(ur_fw); 267 return r; 268} 269 270static int upload_firmware(struct zd_usb *usb) 271{ 272 int r; 273 u16 fw_bcdDevice; 274 u16 bcdDevice; 275 struct usb_device *udev = zd_usb_to_usbdev(usb); 276 const struct firmware *ub_fw = NULL; 277 const struct firmware *uph_fw = NULL; 278 char fw_name[128]; 279 280 bcdDevice = get_bcdDevice(udev); 281 282 r = request_fw_file(&ub_fw, 283 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"), 284 &udev->dev); 285 if (r) 286 goto error; 287 288 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET); 289 290 if (fw_bcdDevice != bcdDevice) { 291 dev_info(&udev->dev, 292 "firmware version %#06x and device bootcode version " 293 "%#06x differ\n", fw_bcdDevice, bcdDevice); 294 if (bcdDevice <= 0x4313) 295 dev_warn(&udev->dev, "device has old bootcode, please " 296 "report success or failure\n"); 297 298 r = handle_version_mismatch(usb, ub_fw); 299 if (r) 300 goto error; 301 } else { 302 dev_dbg_f(&udev->dev, 303 "firmware device id %#06x is equal to the " 304 "actual device id\n", fw_bcdDevice); 305 } 306 307 308 r = request_fw_file(&uph_fw, 309 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"), 310 &udev->dev); 311 if (r) 312 goto error; 313 314 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT); 315 if (r) { 316 dev_err(&udev->dev, 317 "Could not upload firmware code uph. Error number %d\n", 318 r); 319 } 320 321 /* FALL-THROUGH */ 322error: 323 release_firmware(ub_fw); 324 release_firmware(uph_fw); 325 return r; 326} 327 328MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur"); 329MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur"); 330MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub"); 331MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub"); 332MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr"); 333MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr"); 334 335/* Read data from device address space using "firmware interface" which does 336 * not require firmware to be loaded. */ 337int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len) 338{ 339 int r; 340 struct usb_device *udev = zd_usb_to_usbdev(usb); 341 u8 *buf; 342 343 /* Use "DMA-aware" buffer. */ 344 buf = kmalloc(len, GFP_KERNEL); 345 if (!buf) 346 return -ENOMEM; 347 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 348 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0, 349 buf, len, 5000); 350 if (r < 0) { 351 dev_err(&udev->dev, 352 "read over firmware interface failed: %d\n", r); 353 goto exit; 354 } else if (r != len) { 355 dev_err(&udev->dev, 356 "incomplete read over firmware interface: %d/%d\n", 357 r, len); 358 r = -EIO; 359 goto exit; 360 } 361 r = 0; 362 memcpy(data, buf, len); 363exit: 364 kfree(buf); 365 return r; 366} 367 368#define urb_dev(urb) (&(urb)->dev->dev) 369 370static inline void handle_regs_int_override(struct urb *urb) 371{ 372 struct zd_usb *usb = urb->context; 373 struct zd_usb_interrupt *intr = &usb->intr; 374 375 spin_lock(&intr->lock); 376 if (atomic_read(&intr->read_regs_enabled)) { 377 atomic_set(&intr->read_regs_enabled, 0); 378 intr->read_regs_int_overridden = 1; 379 complete(&intr->read_regs.completion); 380 } 381 spin_unlock(&intr->lock); 382} 383 384static inline void handle_regs_int(struct urb *urb) 385{ 386 struct zd_usb *usb = urb->context; 387 struct zd_usb_interrupt *intr = &usb->intr; 388 int len; 389 u16 int_num; 390 391 ZD_ASSERT(in_interrupt()); 392 spin_lock(&intr->lock); 393 394 int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2)); 395 if (int_num == CR_INTERRUPT) { 396 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context)); 397 spin_lock(&mac->lock); 398 memcpy(&mac->intr_buffer, urb->transfer_buffer, 399 USB_MAX_EP_INT_BUFFER); 400 spin_unlock(&mac->lock); 401 schedule_work(&mac->process_intr); 402 } else if (atomic_read(&intr->read_regs_enabled)) { 403 len = urb->actual_length; 404 intr->read_regs.length = urb->actual_length; 405 if (len > sizeof(intr->read_regs.buffer)) 406 len = sizeof(intr->read_regs.buffer); 407 408 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len); 409 410 /* Sometimes USB_INT_ID_REGS is not overridden, but comes after 411 * USB_INT_ID_RETRY_FAILED. Read-reg retry then gets this 412 * delayed USB_INT_ID_REGS, but leaves USB_INT_ID_REGS of 413 * retry unhandled. Next read-reg command then might catch 414 * this wrong USB_INT_ID_REGS. Fix by ignoring wrong reads. 415 */ 416 if (!check_read_regs(usb, intr->read_regs.req, 417 intr->read_regs.req_count)) 418 goto out; 419 420 atomic_set(&intr->read_regs_enabled, 0); 421 intr->read_regs_int_overridden = 0; 422 complete(&intr->read_regs.completion); 423 424 goto out; 425 } 426 427out: 428 spin_unlock(&intr->lock); 429 430 /* CR_INTERRUPT might override read_reg too. */ 431 if (int_num == CR_INTERRUPT && atomic_read(&intr->read_regs_enabled)) 432 handle_regs_int_override(urb); 433} 434 435static void int_urb_complete(struct urb *urb) 436{ 437 int r; 438 struct usb_int_header *hdr; 439 struct zd_usb *usb; 440 struct zd_usb_interrupt *intr; 441 442 switch (urb->status) { 443 case 0: 444 break; 445 case -ESHUTDOWN: 446 case -EINVAL: 447 case -ENODEV: 448 case -ENOENT: 449 case -ECONNRESET: 450 case -EPIPE: 451 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); 452 return; 453 default: 454 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); 455 goto resubmit; 456 } 457 458 if (urb->actual_length < sizeof(hdr)) { 459 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb); 460 goto resubmit; 461 } 462 463 hdr = urb->transfer_buffer; 464 if (hdr->type != USB_INT_TYPE) { 465 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb); 466 goto resubmit; 467 } 468 469 /* USB_INT_ID_RETRY_FAILED triggered by tx-urb submit can override 470 * pending USB_INT_ID_REGS causing read command timeout. 471 */ 472 usb = urb->context; 473 intr = &usb->intr; 474 if (hdr->id != USB_INT_ID_REGS && atomic_read(&intr->read_regs_enabled)) 475 handle_regs_int_override(urb); 476 477 switch (hdr->id) { 478 case USB_INT_ID_REGS: 479 handle_regs_int(urb); 480 break; 481 case USB_INT_ID_RETRY_FAILED: 482 zd_mac_tx_failed(urb); 483 break; 484 default: 485 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb, 486 (unsigned int)hdr->id); 487 goto resubmit; 488 } 489 490resubmit: 491 r = usb_submit_urb(urb, GFP_ATOMIC); 492 if (r) { 493 dev_dbg_f(urb_dev(urb), "error: resubmit urb %p err code %d\n", 494 urb, r); 495 /* TODO: add worker to reset intr->urb */ 496 } 497 return; 498} 499 500static inline int int_urb_interval(struct usb_device *udev) 501{ 502 switch (udev->speed) { 503 case USB_SPEED_HIGH: 504 return 4; 505 case USB_SPEED_LOW: 506 return 10; 507 case USB_SPEED_FULL: 508 default: 509 return 1; 510 } 511} 512 513static inline int usb_int_enabled(struct zd_usb *usb) 514{ 515 unsigned long flags; 516 struct zd_usb_interrupt *intr = &usb->intr; 517 struct urb *urb; 518 519 spin_lock_irqsave(&intr->lock, flags); 520 urb = intr->urb; 521 spin_unlock_irqrestore(&intr->lock, flags); 522 return urb != NULL; 523} 524 525int zd_usb_enable_int(struct zd_usb *usb) 526{ 527 int r; 528 struct usb_device *udev = zd_usb_to_usbdev(usb); 529 struct zd_usb_interrupt *intr = &usb->intr; 530 struct urb *urb; 531 532 dev_dbg_f(zd_usb_dev(usb), "\n"); 533 534 urb = usb_alloc_urb(0, GFP_KERNEL); 535 if (!urb) { 536 r = -ENOMEM; 537 goto out; 538 } 539 540 ZD_ASSERT(!irqs_disabled()); 541 spin_lock_irq(&intr->lock); 542 if (intr->urb) { 543 spin_unlock_irq(&intr->lock); 544 r = 0; 545 goto error_free_urb; 546 } 547 intr->urb = urb; 548 spin_unlock_irq(&intr->lock); 549 550 r = -ENOMEM; 551 intr->buffer = usb_alloc_coherent(udev, USB_MAX_EP_INT_BUFFER, 552 GFP_KERNEL, &intr->buffer_dma); 553 if (!intr->buffer) { 554 dev_dbg_f(zd_usb_dev(usb), 555 "couldn't allocate transfer_buffer\n"); 556 goto error_set_urb_null; 557 } 558 559 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN), 560 intr->buffer, USB_MAX_EP_INT_BUFFER, 561 int_urb_complete, usb, 562 intr->interval); 563 urb->transfer_dma = intr->buffer_dma; 564 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 565 566 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb); 567 r = usb_submit_urb(urb, GFP_KERNEL); 568 if (r) { 569 dev_dbg_f(zd_usb_dev(usb), 570 "Couldn't submit urb. Error number %d\n", r); 571 goto error; 572 } 573 574 return 0; 575error: 576 usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER, 577 intr->buffer, intr->buffer_dma); 578error_set_urb_null: 579 spin_lock_irq(&intr->lock); 580 intr->urb = NULL; 581 spin_unlock_irq(&intr->lock); 582error_free_urb: 583 usb_free_urb(urb); 584out: 585 return r; 586} 587 588void zd_usb_disable_int(struct zd_usb *usb) 589{ 590 unsigned long flags; 591 struct usb_device *udev = zd_usb_to_usbdev(usb); 592 struct zd_usb_interrupt *intr = &usb->intr; 593 struct urb *urb; 594 void *buffer; 595 dma_addr_t buffer_dma; 596 597 spin_lock_irqsave(&intr->lock, flags); 598 urb = intr->urb; 599 if (!urb) { 600 spin_unlock_irqrestore(&intr->lock, flags); 601 return; 602 } 603 intr->urb = NULL; 604 buffer = intr->buffer; 605 buffer_dma = intr->buffer_dma; 606 intr->buffer = NULL; 607 spin_unlock_irqrestore(&intr->lock, flags); 608 609 usb_kill_urb(urb); 610 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb); 611 usb_free_urb(urb); 612 613 if (buffer) 614 usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER, 615 buffer, buffer_dma); 616} 617 618static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer, 619 unsigned int length) 620{ 621 int i; 622 const struct rx_length_info *length_info; 623 624 if (length < sizeof(struct rx_length_info)) { 625 /* It's not a complete packet anyhow. */ 626 dev_dbg_f(zd_usb_dev(usb), "invalid, small RX packet : %d\n", 627 length); 628 return; 629 } 630 length_info = (struct rx_length_info *) 631 (buffer + length - sizeof(struct rx_length_info)); 632 633 /* It might be that three frames are merged into a single URB 634 * transaction. We have to check for the length info tag. 635 * 636 * While testing we discovered that length_info might be unaligned, 637 * because if USB transactions are merged, the last packet will not 638 * be padded. Unaligned access might also happen if the length_info 639 * structure is not present. 640 */ 641 if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG) 642 { 643 unsigned int l, k, n; 644 for (i = 0, l = 0;; i++) { 645 k = get_unaligned_le16(&length_info->length[i]); 646 if (k == 0) 647 return; 648 n = l+k; 649 if (n > length) 650 return; 651 zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k); 652 if (i >= 2) 653 return; 654 l = (n+3) & ~3; 655 } 656 } else { 657 zd_mac_rx(zd_usb_to_hw(usb), buffer, length); 658 } 659} 660 661static void rx_urb_complete(struct urb *urb) 662{ 663 int r; 664 struct zd_usb *usb; 665 struct zd_usb_rx *rx; 666 const u8 *buffer; 667 unsigned int length; 668 669 switch (urb->status) { 670 case 0: 671 break; 672 case -ESHUTDOWN: 673 case -EINVAL: 674 case -ENODEV: 675 case -ENOENT: 676 case -ECONNRESET: 677 case -EPIPE: 678 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); 679 return; 680 default: 681 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); 682 goto resubmit; 683 } 684 685 buffer = urb->transfer_buffer; 686 length = urb->actual_length; 687 usb = urb->context; 688 rx = &usb->rx; 689 690 tasklet_schedule(&rx->reset_timer_tasklet); 691 692 if (length%rx->usb_packet_size > rx->usb_packet_size-4) { 693 /* If there is an old first fragment, we don't care. */ 694 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n"); 695 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment)); 696 spin_lock(&rx->lock); 697 memcpy(rx->fragment, buffer, length); 698 rx->fragment_length = length; 699 spin_unlock(&rx->lock); 700 goto resubmit; 701 } 702 703 spin_lock(&rx->lock); 704 if (rx->fragment_length > 0) { 705 /* We are on a second fragment, we believe */ 706 ZD_ASSERT(length + rx->fragment_length <= 707 ARRAY_SIZE(rx->fragment)); 708 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n"); 709 memcpy(rx->fragment+rx->fragment_length, buffer, length); 710 handle_rx_packet(usb, rx->fragment, 711 rx->fragment_length + length); 712 rx->fragment_length = 0; 713 spin_unlock(&rx->lock); 714 } else { 715 spin_unlock(&rx->lock); 716 handle_rx_packet(usb, buffer, length); 717 } 718 719resubmit: 720 r = usb_submit_urb(urb, GFP_ATOMIC); 721 if (r) 722 dev_dbg_f(urb_dev(urb), "urb %p resubmit error %d\n", urb, r); 723} 724 725static struct urb *alloc_rx_urb(struct zd_usb *usb) 726{ 727 struct usb_device *udev = zd_usb_to_usbdev(usb); 728 struct urb *urb; 729 void *buffer; 730 731 urb = usb_alloc_urb(0, GFP_KERNEL); 732 if (!urb) 733 return NULL; 734 buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL, 735 &urb->transfer_dma); 736 if (!buffer) { 737 usb_free_urb(urb); 738 return NULL; 739 } 740 741 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN), 742 buffer, USB_MAX_RX_SIZE, 743 rx_urb_complete, usb); 744 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 745 746 return urb; 747} 748 749static void free_rx_urb(struct urb *urb) 750{ 751 if (!urb) 752 return; 753 usb_free_coherent(urb->dev, urb->transfer_buffer_length, 754 urb->transfer_buffer, urb->transfer_dma); 755 usb_free_urb(urb); 756} 757 758static int __zd_usb_enable_rx(struct zd_usb *usb) 759{ 760 int i, r; 761 struct zd_usb_rx *rx = &usb->rx; 762 struct urb **urbs; 763 764 dev_dbg_f(zd_usb_dev(usb), "\n"); 765 766 r = -ENOMEM; 767 urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL); 768 if (!urbs) 769 goto error; 770 for (i = 0; i < RX_URBS_COUNT; i++) { 771 urbs[i] = alloc_rx_urb(usb); 772 if (!urbs[i]) 773 goto error; 774 } 775 776 ZD_ASSERT(!irqs_disabled()); 777 spin_lock_irq(&rx->lock); 778 if (rx->urbs) { 779 spin_unlock_irq(&rx->lock); 780 r = 0; 781 goto error; 782 } 783 rx->urbs = urbs; 784 rx->urbs_count = RX_URBS_COUNT; 785 spin_unlock_irq(&rx->lock); 786 787 for (i = 0; i < RX_URBS_COUNT; i++) { 788 r = usb_submit_urb(urbs[i], GFP_KERNEL); 789 if (r) 790 goto error_submit; 791 } 792 793 return 0; 794error_submit: 795 for (i = 0; i < RX_URBS_COUNT; i++) { 796 usb_kill_urb(urbs[i]); 797 } 798 spin_lock_irq(&rx->lock); 799 rx->urbs = NULL; 800 rx->urbs_count = 0; 801 spin_unlock_irq(&rx->lock); 802error: 803 if (urbs) { 804 for (i = 0; i < RX_URBS_COUNT; i++) 805 free_rx_urb(urbs[i]); 806 } 807 return r; 808} 809 810int zd_usb_enable_rx(struct zd_usb *usb) 811{ 812 int r; 813 struct zd_usb_rx *rx = &usb->rx; 814 815 mutex_lock(&rx->setup_mutex); 816 r = __zd_usb_enable_rx(usb); 817 mutex_unlock(&rx->setup_mutex); 818 819 zd_usb_reset_rx_idle_timer(usb); 820 821 return r; 822} 823 824static void __zd_usb_disable_rx(struct zd_usb *usb) 825{ 826 int i; 827 unsigned long flags; 828 struct urb **urbs; 829 unsigned int count; 830 struct zd_usb_rx *rx = &usb->rx; 831 832 spin_lock_irqsave(&rx->lock, flags); 833 urbs = rx->urbs; 834 count = rx->urbs_count; 835 spin_unlock_irqrestore(&rx->lock, flags); 836 if (!urbs) 837 return; 838 839 for (i = 0; i < count; i++) { 840 usb_kill_urb(urbs[i]); 841 free_rx_urb(urbs[i]); 842 } 843 kfree(urbs); 844 845 spin_lock_irqsave(&rx->lock, flags); 846 rx->urbs = NULL; 847 rx->urbs_count = 0; 848 spin_unlock_irqrestore(&rx->lock, flags); 849} 850 851void zd_usb_disable_rx(struct zd_usb *usb) 852{ 853 struct zd_usb_rx *rx = &usb->rx; 854 855 mutex_lock(&rx->setup_mutex); 856 __zd_usb_disable_rx(usb); 857 mutex_unlock(&rx->setup_mutex); 858 859 tasklet_kill(&rx->reset_timer_tasklet); 860 cancel_delayed_work_sync(&rx->idle_work); 861} 862 863static void zd_usb_reset_rx(struct zd_usb *usb) 864{ 865 bool do_reset; 866 struct zd_usb_rx *rx = &usb->rx; 867 unsigned long flags; 868 869 mutex_lock(&rx->setup_mutex); 870 871 spin_lock_irqsave(&rx->lock, flags); 872 do_reset = rx->urbs != NULL; 873 spin_unlock_irqrestore(&rx->lock, flags); 874 875 if (do_reset) { 876 __zd_usb_disable_rx(usb); 877 __zd_usb_enable_rx(usb); 878 } 879 880 mutex_unlock(&rx->setup_mutex); 881 882 if (do_reset) 883 zd_usb_reset_rx_idle_timer(usb); 884} 885 886/** 887 * zd_usb_disable_tx - disable transmission 888 * @usb: the zd1211rw-private USB structure 889 * 890 * Frees all URBs in the free list and marks the transmission as disabled. 891 */ 892void zd_usb_disable_tx(struct zd_usb *usb) 893{ 894 struct zd_usb_tx *tx = &usb->tx; 895 unsigned long flags; 896 897 atomic_set(&tx->enabled, 0); 898 899 /* kill all submitted tx-urbs */ 900 usb_kill_anchored_urbs(&tx->submitted); 901 902 spin_lock_irqsave(&tx->lock, flags); 903 WARN_ON(!skb_queue_empty(&tx->submitted_skbs)); 904 WARN_ON(tx->submitted_urbs != 0); 905 tx->submitted_urbs = 0; 906 spin_unlock_irqrestore(&tx->lock, flags); 907 908 /* The stopped state is ignored, relying on ieee80211_wake_queues() 909 * in a potentionally following zd_usb_enable_tx(). 910 */ 911} 912 913/** 914 * zd_usb_enable_tx - enables transmission 915 * @usb: a &struct zd_usb pointer 916 * 917 * This function enables transmission and prepares the &zd_usb_tx data 918 * structure. 919 */ 920void zd_usb_enable_tx(struct zd_usb *usb) 921{ 922 unsigned long flags; 923 struct zd_usb_tx *tx = &usb->tx; 924 925 spin_lock_irqsave(&tx->lock, flags); 926 atomic_set(&tx->enabled, 1); 927 tx->submitted_urbs = 0; 928 ieee80211_wake_queues(zd_usb_to_hw(usb)); 929 tx->stopped = 0; 930 spin_unlock_irqrestore(&tx->lock, flags); 931} 932 933static void tx_dec_submitted_urbs(struct zd_usb *usb) 934{ 935 struct zd_usb_tx *tx = &usb->tx; 936 unsigned long flags; 937 938 spin_lock_irqsave(&tx->lock, flags); 939 --tx->submitted_urbs; 940 if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) { 941 ieee80211_wake_queues(zd_usb_to_hw(usb)); 942 tx->stopped = 0; 943 } 944 spin_unlock_irqrestore(&tx->lock, flags); 945} 946 947static void tx_inc_submitted_urbs(struct zd_usb *usb) 948{ 949 struct zd_usb_tx *tx = &usb->tx; 950 unsigned long flags; 951 952 spin_lock_irqsave(&tx->lock, flags); 953 ++tx->submitted_urbs; 954 if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) { 955 ieee80211_stop_queues(zd_usb_to_hw(usb)); 956 tx->stopped = 1; 957 } 958 spin_unlock_irqrestore(&tx->lock, flags); 959} 960 961/** 962 * tx_urb_complete - completes the execution of an URB 963 * @urb: a URB 964 * 965 * This function is called if the URB has been transferred to a device or an 966 * error has happened. 967 */ 968static void tx_urb_complete(struct urb *urb) 969{ 970 int r; 971 struct sk_buff *skb; 972 struct ieee80211_tx_info *info; 973 struct zd_usb *usb; 974 struct zd_usb_tx *tx; 975 976 skb = (struct sk_buff *)urb->context; 977 info = IEEE80211_SKB_CB(skb); 978 /* 979 * grab 'usb' pointer before handing off the skb (since 980 * it might be freed by zd_mac_tx_to_dev or mac80211) 981 */ 982 usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb; 983 tx = &usb->tx; 984 985 switch (urb->status) { 986 case 0: 987 break; 988 case -ESHUTDOWN: 989 case -EINVAL: 990 case -ENODEV: 991 case -ENOENT: 992 case -ECONNRESET: 993 case -EPIPE: 994 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); 995 break; 996 default: 997 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); 998 goto resubmit; 999 } 1000free_urb: 1001 skb_unlink(skb, &usb->tx.submitted_skbs); 1002 zd_mac_tx_to_dev(skb, urb->status); 1003 usb_free_urb(urb); 1004 tx_dec_submitted_urbs(usb); 1005 return; 1006resubmit: 1007 usb_anchor_urb(urb, &tx->submitted); 1008 r = usb_submit_urb(urb, GFP_ATOMIC); 1009 if (r) { 1010 usb_unanchor_urb(urb); 1011 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r); 1012 goto free_urb; 1013 } 1014} 1015 1016/** 1017 * zd_usb_tx: initiates transfer of a frame of the device 1018 * 1019 * @usb: the zd1211rw-private USB structure 1020 * @skb: a &struct sk_buff pointer 1021 * 1022 * This function tranmits a frame to the device. It doesn't wait for 1023 * completion. The frame must contain the control set and have all the 1024 * control set information available. 1025 * 1026 * The function returns 0 if the transfer has been successfully initiated. 1027 */ 1028int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb) 1029{ 1030 int r; 1031 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1032 struct usb_device *udev = zd_usb_to_usbdev(usb); 1033 struct urb *urb; 1034 struct zd_usb_tx *tx = &usb->tx; 1035 1036 if (!atomic_read(&tx->enabled)) { 1037 r = -ENOENT; 1038 goto out; 1039 } 1040 1041 urb = usb_alloc_urb(0, GFP_ATOMIC); 1042 if (!urb) { 1043 r = -ENOMEM; 1044 goto out; 1045 } 1046 1047 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT), 1048 skb->data, skb->len, tx_urb_complete, skb); 1049 1050 info->rate_driver_data[1] = (void *)jiffies; 1051 skb_queue_tail(&tx->submitted_skbs, skb); 1052 usb_anchor_urb(urb, &tx->submitted); 1053 1054 r = usb_submit_urb(urb, GFP_ATOMIC); 1055 if (r) { 1056 dev_dbg_f(zd_usb_dev(usb), "error submit urb %p %d\n", urb, r); 1057 usb_unanchor_urb(urb); 1058 skb_unlink(skb, &tx->submitted_skbs); 1059 goto error; 1060 } 1061 tx_inc_submitted_urbs(usb); 1062 return 0; 1063error: 1064 usb_free_urb(urb); 1065out: 1066 return r; 1067} 1068 1069static bool zd_tx_timeout(struct zd_usb *usb) 1070{ 1071 struct zd_usb_tx *tx = &usb->tx; 1072 struct sk_buff_head *q = &tx->submitted_skbs; 1073 struct sk_buff *skb, *skbnext; 1074 struct ieee80211_tx_info *info; 1075 unsigned long flags, trans_start; 1076 bool have_timedout = false; 1077 1078 spin_lock_irqsave(&q->lock, flags); 1079 skb_queue_walk_safe(q, skb, skbnext) { 1080 info = IEEE80211_SKB_CB(skb); 1081 trans_start = (unsigned long)info->rate_driver_data[1]; 1082 1083 if (time_is_before_jiffies(trans_start + ZD_TX_TIMEOUT)) { 1084 have_timedout = true; 1085 break; 1086 } 1087 } 1088 spin_unlock_irqrestore(&q->lock, flags); 1089 1090 return have_timedout; 1091} 1092 1093static void zd_tx_watchdog_handler(struct work_struct *work) 1094{ 1095 struct zd_usb *usb = 1096 container_of(work, struct zd_usb, tx.watchdog_work.work); 1097 struct zd_usb_tx *tx = &usb->tx; 1098 1099 if (!atomic_read(&tx->enabled) || !tx->watchdog_enabled) 1100 goto out; 1101 if (!zd_tx_timeout(usb)) 1102 goto out; 1103 1104 /* TX halted, try reset */ 1105 dev_warn(zd_usb_dev(usb), "TX-stall detected, resetting device..."); 1106 1107 usb_queue_reset_device(usb->intf); 1108 1109 /* reset will stop this worker, don't rearm */ 1110 return; 1111out: 1112 queue_delayed_work(zd_workqueue, &tx->watchdog_work, 1113 ZD_TX_WATCHDOG_INTERVAL); 1114} 1115 1116void zd_tx_watchdog_enable(struct zd_usb *usb) 1117{ 1118 struct zd_usb_tx *tx = &usb->tx; 1119 1120 if (!tx->watchdog_enabled) { 1121 dev_dbg_f(zd_usb_dev(usb), "\n"); 1122 queue_delayed_work(zd_workqueue, &tx->watchdog_work, 1123 ZD_TX_WATCHDOG_INTERVAL); 1124 tx->watchdog_enabled = 1; 1125 } 1126} 1127 1128void zd_tx_watchdog_disable(struct zd_usb *usb) 1129{ 1130 struct zd_usb_tx *tx = &usb->tx; 1131 1132 if (tx->watchdog_enabled) { 1133 dev_dbg_f(zd_usb_dev(usb), "\n"); 1134 tx->watchdog_enabled = 0; 1135 cancel_delayed_work_sync(&tx->watchdog_work); 1136 } 1137} 1138 1139static void zd_rx_idle_timer_handler(struct work_struct *work) 1140{ 1141 struct zd_usb *usb = 1142 container_of(work, struct zd_usb, rx.idle_work.work); 1143 struct zd_mac *mac = zd_usb_to_mac(usb); 1144 1145 if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags)) 1146 return; 1147 1148 dev_dbg_f(zd_usb_dev(usb), "\n"); 1149 1150 /* 30 seconds since last rx, reset rx */ 1151 zd_usb_reset_rx(usb); 1152} 1153 1154static void zd_usb_reset_rx_idle_timer_tasklet(unsigned long param) 1155{ 1156 struct zd_usb *usb = (struct zd_usb *)param; 1157 1158 zd_usb_reset_rx_idle_timer(usb); 1159} 1160 1161void zd_usb_reset_rx_idle_timer(struct zd_usb *usb) 1162{ 1163 struct zd_usb_rx *rx = &usb->rx; 1164 1165 mod_delayed_work(zd_workqueue, &rx->idle_work, ZD_RX_IDLE_INTERVAL); 1166} 1167 1168static inline void init_usb_interrupt(struct zd_usb *usb) 1169{ 1170 struct zd_usb_interrupt *intr = &usb->intr; 1171 1172 spin_lock_init(&intr->lock); 1173 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb)); 1174 init_completion(&intr->read_regs.completion); 1175 atomic_set(&intr->read_regs_enabled, 0); 1176 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT); 1177} 1178 1179static inline void init_usb_rx(struct zd_usb *usb) 1180{ 1181 struct zd_usb_rx *rx = &usb->rx; 1182 1183 spin_lock_init(&rx->lock); 1184 mutex_init(&rx->setup_mutex); 1185 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) { 1186 rx->usb_packet_size = 512; 1187 } else { 1188 rx->usb_packet_size = 64; 1189 } 1190 ZD_ASSERT(rx->fragment_length == 0); 1191 INIT_DELAYED_WORK(&rx->idle_work, zd_rx_idle_timer_handler); 1192 rx->reset_timer_tasklet.func = zd_usb_reset_rx_idle_timer_tasklet; 1193 rx->reset_timer_tasklet.data = (unsigned long)usb; 1194} 1195 1196static inline void init_usb_tx(struct zd_usb *usb) 1197{ 1198 struct zd_usb_tx *tx = &usb->tx; 1199 1200 spin_lock_init(&tx->lock); 1201 atomic_set(&tx->enabled, 0); 1202 tx->stopped = 0; 1203 skb_queue_head_init(&tx->submitted_skbs); 1204 init_usb_anchor(&tx->submitted); 1205 tx->submitted_urbs = 0; 1206 tx->watchdog_enabled = 0; 1207 INIT_DELAYED_WORK(&tx->watchdog_work, zd_tx_watchdog_handler); 1208} 1209 1210void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw, 1211 struct usb_interface *intf) 1212{ 1213 memset(usb, 0, sizeof(*usb)); 1214 usb->intf = usb_get_intf(intf); 1215 usb_set_intfdata(usb->intf, hw); 1216 init_usb_anchor(&usb->submitted_cmds); 1217 init_usb_interrupt(usb); 1218 init_usb_tx(usb); 1219 init_usb_rx(usb); 1220} 1221 1222void zd_usb_clear(struct zd_usb *usb) 1223{ 1224 usb_set_intfdata(usb->intf, NULL); 1225 usb_put_intf(usb->intf); 1226 ZD_MEMCLEAR(usb, sizeof(*usb)); 1227 /* FIXME: usb_interrupt, usb_tx, usb_rx? */ 1228} 1229 1230static const char *speed(enum usb_device_speed speed) 1231{ 1232 switch (speed) { 1233 case USB_SPEED_LOW: 1234 return "low"; 1235 case USB_SPEED_FULL: 1236 return "full"; 1237 case USB_SPEED_HIGH: 1238 return "high"; 1239 default: 1240 return "unknown speed"; 1241 } 1242} 1243 1244static int scnprint_id(struct usb_device *udev, char *buffer, size_t size) 1245{ 1246 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s", 1247 le16_to_cpu(udev->descriptor.idVendor), 1248 le16_to_cpu(udev->descriptor.idProduct), 1249 get_bcdDevice(udev), 1250 speed(udev->speed)); 1251} 1252 1253int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size) 1254{ 1255 struct usb_device *udev = interface_to_usbdev(usb->intf); 1256 return scnprint_id(udev, buffer, size); 1257} 1258 1259#ifdef DEBUG 1260static void print_id(struct usb_device *udev) 1261{ 1262 char buffer[40]; 1263 1264 scnprint_id(udev, buffer, sizeof(buffer)); 1265 buffer[sizeof(buffer)-1] = 0; 1266 dev_dbg_f(&udev->dev, "%s\n", buffer); 1267} 1268#else 1269#define print_id(udev) do { } while (0) 1270#endif 1271 1272static int eject_installer(struct usb_interface *intf) 1273{ 1274 struct usb_device *udev = interface_to_usbdev(intf); 1275 struct usb_host_interface *iface_desc = &intf->altsetting[0]; 1276 struct usb_endpoint_descriptor *endpoint; 1277 unsigned char *cmd; 1278 u8 bulk_out_ep; 1279 int r; 1280 1281 /* Find bulk out endpoint */ 1282 for (r = 1; r >= 0; r--) { 1283 endpoint = &iface_desc->endpoint[r].desc; 1284 if (usb_endpoint_dir_out(endpoint) && 1285 usb_endpoint_xfer_bulk(endpoint)) { 1286 bulk_out_ep = endpoint->bEndpointAddress; 1287 break; 1288 } 1289 } 1290 if (r == -1) { 1291 dev_err(&udev->dev, 1292 "zd1211rw: Could not find bulk out endpoint\n"); 1293 return -ENODEV; 1294 } 1295 1296 cmd = kzalloc(31, GFP_KERNEL); 1297 if (cmd == NULL) 1298 return -ENODEV; 1299 1300 /* USB bulk command block */ 1301 cmd[0] = 0x55; /* bulk command signature */ 1302 cmd[1] = 0x53; /* bulk command signature */ 1303 cmd[2] = 0x42; /* bulk command signature */ 1304 cmd[3] = 0x43; /* bulk command signature */ 1305 cmd[14] = 6; /* command length */ 1306 1307 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */ 1308 cmd[19] = 0x2; /* eject disc */ 1309 1310 dev_info(&udev->dev, "Ejecting virtual installer media...\n"); 1311 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep), 1312 cmd, 31, NULL, 2000); 1313 kfree(cmd); 1314 if (r) 1315 return r; 1316 1317 /* At this point, the device disconnects and reconnects with the real 1318 * ID numbers. */ 1319 1320 usb_set_intfdata(intf, NULL); 1321 return 0; 1322} 1323 1324int zd_usb_init_hw(struct zd_usb *usb) 1325{ 1326 int r; 1327 struct zd_mac *mac = zd_usb_to_mac(usb); 1328 1329 dev_dbg_f(zd_usb_dev(usb), "\n"); 1330 1331 r = upload_firmware(usb); 1332 if (r) { 1333 dev_err(zd_usb_dev(usb), 1334 "couldn't load firmware. Error number %d\n", r); 1335 return r; 1336 } 1337 1338 r = usb_reset_configuration(zd_usb_to_usbdev(usb)); 1339 if (r) { 1340 dev_dbg_f(zd_usb_dev(usb), 1341 "couldn't reset configuration. Error number %d\n", r); 1342 return r; 1343 } 1344 1345 r = zd_mac_init_hw(mac->hw); 1346 if (r) { 1347 dev_dbg_f(zd_usb_dev(usb), 1348 "couldn't initialize mac. Error number %d\n", r); 1349 return r; 1350 } 1351 1352 usb->initialized = 1; 1353 return 0; 1354} 1355 1356static int probe(struct usb_interface *intf, const struct usb_device_id *id) 1357{ 1358 int r; 1359 struct usb_device *udev = interface_to_usbdev(intf); 1360 struct zd_usb *usb; 1361 struct ieee80211_hw *hw = NULL; 1362 1363 print_id(udev); 1364 1365 if (id->driver_info & DEVICE_INSTALLER) 1366 return eject_installer(intf); 1367 1368 switch (udev->speed) { 1369 case USB_SPEED_LOW: 1370 case USB_SPEED_FULL: 1371 case USB_SPEED_HIGH: 1372 break; 1373 default: 1374 dev_dbg_f(&intf->dev, "Unknown USB speed\n"); 1375 r = -ENODEV; 1376 goto error; 1377 } 1378 1379 r = usb_reset_device(udev); 1380 if (r) { 1381 dev_err(&intf->dev, 1382 "couldn't reset usb device. Error number %d\n", r); 1383 goto error; 1384 } 1385 1386 hw = zd_mac_alloc_hw(intf); 1387 if (hw == NULL) { 1388 r = -ENOMEM; 1389 goto error; 1390 } 1391 1392 usb = &zd_hw_mac(hw)->chip.usb; 1393 usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0; 1394 1395 r = zd_mac_preinit_hw(hw); 1396 if (r) { 1397 dev_dbg_f(&intf->dev, 1398 "couldn't initialize mac. Error number %d\n", r); 1399 goto error; 1400 } 1401 1402 r = ieee80211_register_hw(hw); 1403 if (r) { 1404 dev_dbg_f(&intf->dev, 1405 "couldn't register device. Error number %d\n", r); 1406 goto error; 1407 } 1408 1409 dev_dbg_f(&intf->dev, "successful\n"); 1410 dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy)); 1411 return 0; 1412error: 1413 usb_reset_device(interface_to_usbdev(intf)); 1414 if (hw) { 1415 zd_mac_clear(zd_hw_mac(hw)); 1416 ieee80211_free_hw(hw); 1417 } 1418 return r; 1419} 1420 1421static void disconnect(struct usb_interface *intf) 1422{ 1423 struct ieee80211_hw *hw = zd_intf_to_hw(intf); 1424 struct zd_mac *mac; 1425 struct zd_usb *usb; 1426 1427 /* Either something really bad happened, or we're just dealing with 1428 * a DEVICE_INSTALLER. */ 1429 if (hw == NULL) 1430 return; 1431 1432 mac = zd_hw_mac(hw); 1433 usb = &mac->chip.usb; 1434 1435 dev_dbg_f(zd_usb_dev(usb), "\n"); 1436 1437 ieee80211_unregister_hw(hw); 1438 1439 /* Just in case something has gone wrong! */ 1440 zd_usb_disable_tx(usb); 1441 zd_usb_disable_rx(usb); 1442 zd_usb_disable_int(usb); 1443 1444 /* If the disconnect has been caused by a removal of the 1445 * driver module, the reset allows reloading of the driver. If the 1446 * reset will not be executed here, the upload of the firmware in the 1447 * probe function caused by the reloading of the driver will fail. 1448 */ 1449 usb_reset_device(interface_to_usbdev(intf)); 1450 1451 zd_mac_clear(mac); 1452 ieee80211_free_hw(hw); 1453 dev_dbg(&intf->dev, "disconnected\n"); 1454} 1455 1456static void zd_usb_resume(struct zd_usb *usb) 1457{ 1458 struct zd_mac *mac = zd_usb_to_mac(usb); 1459 int r; 1460 1461 dev_dbg_f(zd_usb_dev(usb), "\n"); 1462 1463 r = zd_op_start(zd_usb_to_hw(usb)); 1464 if (r < 0) { 1465 dev_warn(zd_usb_dev(usb), "Device resume failed " 1466 "with error code %d. Retrying...\n", r); 1467 if (usb->was_running) 1468 set_bit(ZD_DEVICE_RUNNING, &mac->flags); 1469 usb_queue_reset_device(usb->intf); 1470 return; 1471 } 1472 1473 if (mac->type != NL80211_IFTYPE_UNSPECIFIED) { 1474 r = zd_restore_settings(mac); 1475 if (r < 0) { 1476 dev_dbg(zd_usb_dev(usb), 1477 "failed to restore settings, %d\n", r); 1478 return; 1479 } 1480 } 1481} 1482 1483static void zd_usb_stop(struct zd_usb *usb) 1484{ 1485 dev_dbg_f(zd_usb_dev(usb), "\n"); 1486 1487 zd_op_stop(zd_usb_to_hw(usb)); 1488 1489 zd_usb_disable_tx(usb); 1490 zd_usb_disable_rx(usb); 1491 zd_usb_disable_int(usb); 1492 1493 usb->initialized = 0; 1494} 1495 1496static int pre_reset(struct usb_interface *intf) 1497{ 1498 struct ieee80211_hw *hw = usb_get_intfdata(intf); 1499 struct zd_mac *mac; 1500 struct zd_usb *usb; 1501 1502 if (!hw || intf->condition != USB_INTERFACE_BOUND) 1503 return 0; 1504 1505 mac = zd_hw_mac(hw); 1506 usb = &mac->chip.usb; 1507 1508 usb->was_running = test_bit(ZD_DEVICE_RUNNING, &mac->flags); 1509 1510 zd_usb_stop(usb); 1511 1512 mutex_lock(&mac->chip.mutex); 1513 return 0; 1514} 1515 1516static int post_reset(struct usb_interface *intf) 1517{ 1518 struct ieee80211_hw *hw = usb_get_intfdata(intf); 1519 struct zd_mac *mac; 1520 struct zd_usb *usb; 1521 1522 if (!hw || intf->condition != USB_INTERFACE_BOUND) 1523 return 0; 1524 1525 mac = zd_hw_mac(hw); 1526 usb = &mac->chip.usb; 1527 1528 mutex_unlock(&mac->chip.mutex); 1529 1530 if (usb->was_running) 1531 zd_usb_resume(usb); 1532 return 0; 1533} 1534 1535static struct usb_driver driver = { 1536 .name = KBUILD_MODNAME, 1537 .id_table = usb_ids, 1538 .probe = probe, 1539 .disconnect = disconnect, 1540 .pre_reset = pre_reset, 1541 .post_reset = post_reset, 1542 .disable_hub_initiated_lpm = 1, 1543}; 1544 1545struct workqueue_struct *zd_workqueue; 1546 1547static int __init usb_init(void) 1548{ 1549 int r; 1550 1551 pr_debug("%s usb_init()\n", driver.name); 1552 1553 zd_workqueue = create_singlethread_workqueue(driver.name); 1554 if (zd_workqueue == NULL) { 1555 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name); 1556 return -ENOMEM; 1557 } 1558 1559 r = usb_register(&driver); 1560 if (r) { 1561 destroy_workqueue(zd_workqueue); 1562 printk(KERN_ERR "%s usb_register() failed. Error number %d\n", 1563 driver.name, r); 1564 return r; 1565 } 1566 1567 pr_debug("%s initialized\n", driver.name); 1568 return 0; 1569} 1570 1571static void __exit usb_exit(void) 1572{ 1573 pr_debug("%s usb_exit()\n", driver.name); 1574 usb_deregister(&driver); 1575 destroy_workqueue(zd_workqueue); 1576} 1577 1578module_init(usb_init); 1579module_exit(usb_exit); 1580 1581static int zd_ep_regs_out_msg(struct usb_device *udev, void *data, int len, 1582 int *actual_length, int timeout) 1583{ 1584 /* In USB 2.0 mode EP_REGS_OUT endpoint is interrupt type. However in 1585 * USB 1.1 mode endpoint is bulk. Select correct type URB by endpoint 1586 * descriptor. 1587 */ 1588 struct usb_host_endpoint *ep; 1589 unsigned int pipe; 1590 1591 pipe = usb_sndintpipe(udev, EP_REGS_OUT); 1592 ep = usb_pipe_endpoint(udev, pipe); 1593 if (!ep) 1594 return -EINVAL; 1595 1596 if (usb_endpoint_xfer_int(&ep->desc)) { 1597 return usb_interrupt_msg(udev, pipe, data, len, 1598 actual_length, timeout); 1599 } else { 1600 pipe = usb_sndbulkpipe(udev, EP_REGS_OUT); 1601 return usb_bulk_msg(udev, pipe, data, len, actual_length, 1602 timeout); 1603 } 1604} 1605 1606static int usb_int_regs_length(unsigned int count) 1607{ 1608 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data); 1609} 1610 1611static void prepare_read_regs_int(struct zd_usb *usb, 1612 struct usb_req_read_regs *req, 1613 unsigned int count) 1614{ 1615 struct zd_usb_interrupt *intr = &usb->intr; 1616 1617 spin_lock_irq(&intr->lock); 1618 atomic_set(&intr->read_regs_enabled, 1); 1619 intr->read_regs.req = req; 1620 intr->read_regs.req_count = count; 1621 reinit_completion(&intr->read_regs.completion); 1622 spin_unlock_irq(&intr->lock); 1623} 1624 1625static void disable_read_regs_int(struct zd_usb *usb) 1626{ 1627 struct zd_usb_interrupt *intr = &usb->intr; 1628 1629 spin_lock_irq(&intr->lock); 1630 atomic_set(&intr->read_regs_enabled, 0); 1631 spin_unlock_irq(&intr->lock); 1632} 1633 1634static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req, 1635 unsigned int count) 1636{ 1637 int i; 1638 struct zd_usb_interrupt *intr = &usb->intr; 1639 struct read_regs_int *rr = &intr->read_regs; 1640 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer; 1641 1642 /* The created block size seems to be larger than expected. 1643 * However results appear to be correct. 1644 */ 1645 if (rr->length < usb_int_regs_length(count)) { 1646 dev_dbg_f(zd_usb_dev(usb), 1647 "error: actual length %d less than expected %d\n", 1648 rr->length, usb_int_regs_length(count)); 1649 return false; 1650 } 1651 1652 if (rr->length > sizeof(rr->buffer)) { 1653 dev_dbg_f(zd_usb_dev(usb), 1654 "error: actual length %d exceeds buffer size %zu\n", 1655 rr->length, sizeof(rr->buffer)); 1656 return false; 1657 } 1658 1659 for (i = 0; i < count; i++) { 1660 struct reg_data *rd = ®s->regs[i]; 1661 if (rd->addr != req->addr[i]) { 1662 dev_dbg_f(zd_usb_dev(usb), 1663 "rd[%d] addr %#06hx expected %#06hx\n", i, 1664 le16_to_cpu(rd->addr), 1665 le16_to_cpu(req->addr[i])); 1666 return false; 1667 } 1668 } 1669 1670 return true; 1671} 1672 1673static int get_results(struct zd_usb *usb, u16 *values, 1674 struct usb_req_read_regs *req, unsigned int count, 1675 bool *retry) 1676{ 1677 int r; 1678 int i; 1679 struct zd_usb_interrupt *intr = &usb->intr; 1680 struct read_regs_int *rr = &intr->read_regs; 1681 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer; 1682 1683 spin_lock_irq(&intr->lock); 1684 1685 r = -EIO; 1686 1687 /* Read failed because firmware bug? */ 1688 *retry = !!intr->read_regs_int_overridden; 1689 if (*retry) 1690 goto error_unlock; 1691 1692 if (!check_read_regs(usb, req, count)) { 1693 dev_dbg_f(zd_usb_dev(usb), "error: invalid read regs\n"); 1694 goto error_unlock; 1695 } 1696 1697 for (i = 0; i < count; i++) { 1698 struct reg_data *rd = ®s->regs[i]; 1699 values[i] = le16_to_cpu(rd->value); 1700 } 1701 1702 r = 0; 1703error_unlock: 1704 spin_unlock_irq(&intr->lock); 1705 return r; 1706} 1707 1708int zd_usb_ioread16v(struct zd_usb *usb, u16 *values, 1709 const zd_addr_t *addresses, unsigned int count) 1710{ 1711 int r, i, req_len, actual_req_len, try_count = 0; 1712 struct usb_device *udev; 1713 struct usb_req_read_regs *req = NULL; 1714 unsigned long timeout; 1715 bool retry = false; 1716 1717 if (count < 1) { 1718 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n"); 1719 return -EINVAL; 1720 } 1721 if (count > USB_MAX_IOREAD16_COUNT) { 1722 dev_dbg_f(zd_usb_dev(usb), 1723 "error: count %u exceeds possible max %u\n", 1724 count, USB_MAX_IOREAD16_COUNT); 1725 return -EINVAL; 1726 } 1727 if (in_atomic()) { 1728 dev_dbg_f(zd_usb_dev(usb), 1729 "error: io in atomic context not supported\n"); 1730 return -EWOULDBLOCK; 1731 } 1732 if (!usb_int_enabled(usb)) { 1733 dev_dbg_f(zd_usb_dev(usb), 1734 "error: usb interrupt not enabled\n"); 1735 return -EWOULDBLOCK; 1736 } 1737 1738 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex)); 1739 BUILD_BUG_ON(sizeof(struct usb_req_read_regs) + USB_MAX_IOREAD16_COUNT * 1740 sizeof(__le16) > sizeof(usb->req_buf)); 1741 BUG_ON(sizeof(struct usb_req_read_regs) + count * sizeof(__le16) > 1742 sizeof(usb->req_buf)); 1743 1744 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16); 1745 req = (void *)usb->req_buf; 1746 1747 req->id = cpu_to_le16(USB_REQ_READ_REGS); 1748 for (i = 0; i < count; i++) 1749 req->addr[i] = cpu_to_le16((u16)addresses[i]); 1750 1751retry_read: 1752 try_count++; 1753 udev = zd_usb_to_usbdev(usb); 1754 prepare_read_regs_int(usb, req, count); 1755 r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/); 1756 if (r) { 1757 dev_dbg_f(zd_usb_dev(usb), 1758 "error in zd_ep_regs_out_msg(). Error number %d\n", r); 1759 goto error; 1760 } 1761 if (req_len != actual_req_len) { 1762 dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()\n" 1763 " req_len %d != actual_req_len %d\n", 1764 req_len, actual_req_len); 1765 r = -EIO; 1766 goto error; 1767 } 1768 1769 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion, 1770 msecs_to_jiffies(50)); 1771 if (!timeout) { 1772 disable_read_regs_int(usb); 1773 dev_dbg_f(zd_usb_dev(usb), "read timed out\n"); 1774 r = -ETIMEDOUT; 1775 goto error; 1776 } 1777 1778 r = get_results(usb, values, req, count, &retry); 1779 if (retry && try_count < 20) { 1780 dev_dbg_f(zd_usb_dev(usb), "read retry, tries so far: %d\n", 1781 try_count); 1782 goto retry_read; 1783 } 1784error: 1785 return r; 1786} 1787 1788static void iowrite16v_urb_complete(struct urb *urb) 1789{ 1790 struct zd_usb *usb = urb->context; 1791 1792 if (urb->status && !usb->cmd_error) 1793 usb->cmd_error = urb->status; 1794 1795 if (!usb->cmd_error && 1796 urb->actual_length != urb->transfer_buffer_length) 1797 usb->cmd_error = -EIO; 1798} 1799 1800static int zd_submit_waiting_urb(struct zd_usb *usb, bool last) 1801{ 1802 int r = 0; 1803 struct urb *urb = usb->urb_async_waiting; 1804 1805 if (!urb) 1806 return 0; 1807 1808 usb->urb_async_waiting = NULL; 1809 1810 if (!last) 1811 urb->transfer_flags |= URB_NO_INTERRUPT; 1812 1813 usb_anchor_urb(urb, &usb->submitted_cmds); 1814 r = usb_submit_urb(urb, GFP_KERNEL); 1815 if (r) { 1816 usb_unanchor_urb(urb); 1817 dev_dbg_f(zd_usb_dev(usb), 1818 "error in usb_submit_urb(). Error number %d\n", r); 1819 goto error; 1820 } 1821 1822 /* fall-through with r == 0 */ 1823error: 1824 usb_free_urb(urb); 1825 return r; 1826} 1827 1828void zd_usb_iowrite16v_async_start(struct zd_usb *usb) 1829{ 1830 ZD_ASSERT(usb_anchor_empty(&usb->submitted_cmds)); 1831 ZD_ASSERT(usb->urb_async_waiting == NULL); 1832 ZD_ASSERT(!usb->in_async); 1833 1834 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex)); 1835 1836 usb->in_async = 1; 1837 usb->cmd_error = 0; 1838 usb->urb_async_waiting = NULL; 1839} 1840 1841int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout) 1842{ 1843 int r; 1844 1845 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex)); 1846 ZD_ASSERT(usb->in_async); 1847 1848 /* Submit last iowrite16v URB */ 1849 r = zd_submit_waiting_urb(usb, true); 1850 if (r) { 1851 dev_dbg_f(zd_usb_dev(usb), 1852 "error in zd_submit_waiting_usb(). " 1853 "Error number %d\n", r); 1854 1855 usb_kill_anchored_urbs(&usb->submitted_cmds); 1856 goto error; 1857 } 1858 1859 if (timeout) 1860 timeout = usb_wait_anchor_empty_timeout(&usb->submitted_cmds, 1861 timeout); 1862 if (!timeout) { 1863 usb_kill_anchored_urbs(&usb->submitted_cmds); 1864 if (usb->cmd_error == -ENOENT) { 1865 dev_dbg_f(zd_usb_dev(usb), "timed out"); 1866 r = -ETIMEDOUT; 1867 goto error; 1868 } 1869 } 1870 1871 r = usb->cmd_error; 1872error: 1873 usb->in_async = 0; 1874 return r; 1875} 1876 1877int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs, 1878 unsigned int count) 1879{ 1880 int r; 1881 struct usb_device *udev; 1882 struct usb_req_write_regs *req = NULL; 1883 int i, req_len; 1884 struct urb *urb; 1885 struct usb_host_endpoint *ep; 1886 1887 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex)); 1888 ZD_ASSERT(usb->in_async); 1889 1890 if (count == 0) 1891 return 0; 1892 if (count > USB_MAX_IOWRITE16_COUNT) { 1893 dev_dbg_f(zd_usb_dev(usb), 1894 "error: count %u exceeds possible max %u\n", 1895 count, USB_MAX_IOWRITE16_COUNT); 1896 return -EINVAL; 1897 } 1898 if (in_atomic()) { 1899 dev_dbg_f(zd_usb_dev(usb), 1900 "error: io in atomic context not supported\n"); 1901 return -EWOULDBLOCK; 1902 } 1903 1904 udev = zd_usb_to_usbdev(usb); 1905 1906 ep = usb_pipe_endpoint(udev, usb_sndintpipe(udev, EP_REGS_OUT)); 1907 if (!ep) 1908 return -ENOENT; 1909 1910 urb = usb_alloc_urb(0, GFP_KERNEL); 1911 if (!urb) 1912 return -ENOMEM; 1913 1914 req_len = sizeof(struct usb_req_write_regs) + 1915 count * sizeof(struct reg_data); 1916 req = kmalloc(req_len, GFP_KERNEL); 1917 if (!req) { 1918 r = -ENOMEM; 1919 goto error; 1920 } 1921 1922 req->id = cpu_to_le16(USB_REQ_WRITE_REGS); 1923 for (i = 0; i < count; i++) { 1924 struct reg_data *rw = &req->reg_writes[i]; 1925 rw->addr = cpu_to_le16((u16)ioreqs[i].addr); 1926 rw->value = cpu_to_le16(ioreqs[i].value); 1927 } 1928 1929 /* In USB 2.0 mode endpoint is interrupt type. However in USB 1.1 mode 1930 * endpoint is bulk. Select correct type URB by endpoint descriptor. 1931 */ 1932 if (usb_endpoint_xfer_int(&ep->desc)) 1933 usb_fill_int_urb(urb, udev, usb_sndintpipe(udev, EP_REGS_OUT), 1934 req, req_len, iowrite16v_urb_complete, usb, 1935 ep->desc.bInterval); 1936 else 1937 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_REGS_OUT), 1938 req, req_len, iowrite16v_urb_complete, usb); 1939 1940 urb->transfer_flags |= URB_FREE_BUFFER; 1941 1942 /* Submit previous URB */ 1943 r = zd_submit_waiting_urb(usb, false); 1944 if (r) { 1945 dev_dbg_f(zd_usb_dev(usb), 1946 "error in zd_submit_waiting_usb(). " 1947 "Error number %d\n", r); 1948 goto error; 1949 } 1950 1951 /* Delay submit so that URB_NO_INTERRUPT flag can be set for all URBs 1952 * of currect batch except for very last. 1953 */ 1954 usb->urb_async_waiting = urb; 1955 return 0; 1956error: 1957 usb_free_urb(urb); 1958 return r; 1959} 1960 1961int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs, 1962 unsigned int count) 1963{ 1964 int r; 1965 1966 zd_usb_iowrite16v_async_start(usb); 1967 r = zd_usb_iowrite16v_async(usb, ioreqs, count); 1968 if (r) { 1969 zd_usb_iowrite16v_async_end(usb, 0); 1970 return r; 1971 } 1972 return zd_usb_iowrite16v_async_end(usb, 50 /* ms */); 1973} 1974 1975int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits) 1976{ 1977 int r; 1978 struct usb_device *udev; 1979 struct usb_req_rfwrite *req = NULL; 1980 int i, req_len, actual_req_len; 1981 u16 bit_value_template; 1982 1983 if (in_atomic()) { 1984 dev_dbg_f(zd_usb_dev(usb), 1985 "error: io in atomic context not supported\n"); 1986 return -EWOULDBLOCK; 1987 } 1988 if (bits < USB_MIN_RFWRITE_BIT_COUNT) { 1989 dev_dbg_f(zd_usb_dev(usb), 1990 "error: bits %d are smaller than" 1991 " USB_MIN_RFWRITE_BIT_COUNT %d\n", 1992 bits, USB_MIN_RFWRITE_BIT_COUNT); 1993 return -EINVAL; 1994 } 1995 if (bits > USB_MAX_RFWRITE_BIT_COUNT) { 1996 dev_dbg_f(zd_usb_dev(usb), 1997 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n", 1998 bits, USB_MAX_RFWRITE_BIT_COUNT); 1999 return -EINVAL; 2000 } 2001#ifdef DEBUG 2002 if (value & (~0UL << bits)) { 2003 dev_dbg_f(zd_usb_dev(usb), 2004 "error: value %#09x has bits >= %d set\n", 2005 value, bits); 2006 return -EINVAL; 2007 } 2008#endif /* DEBUG */ 2009 2010 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits); 2011 2012 r = zd_usb_ioread16(usb, &bit_value_template, ZD_CR203); 2013 if (r) { 2014 dev_dbg_f(zd_usb_dev(usb), 2015 "error %d: Couldn't read ZD_CR203\n", r); 2016 return r; 2017 } 2018 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA); 2019 2020 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex)); 2021 BUILD_BUG_ON(sizeof(struct usb_req_rfwrite) + 2022 USB_MAX_RFWRITE_BIT_COUNT * sizeof(__le16) > 2023 sizeof(usb->req_buf)); 2024 BUG_ON(sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16) > 2025 sizeof(usb->req_buf)); 2026 2027 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16); 2028 req = (void *)usb->req_buf; 2029 2030 req->id = cpu_to_le16(USB_REQ_WRITE_RF); 2031 /* 1: 3683a, but not used in ZYDAS driver */ 2032 req->value = cpu_to_le16(2); 2033 req->bits = cpu_to_le16(bits); 2034 2035 for (i = 0; i < bits; i++) { 2036 u16 bv = bit_value_template; 2037 if (value & (1 << (bits-1-i))) 2038 bv |= RF_DATA; 2039 req->bit_values[i] = cpu_to_le16(bv); 2040 } 2041 2042 udev = zd_usb_to_usbdev(usb); 2043 r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/); 2044 if (r) { 2045 dev_dbg_f(zd_usb_dev(usb), 2046 "error in zd_ep_regs_out_msg(). Error number %d\n", r); 2047 goto out; 2048 } 2049 if (req_len != actual_req_len) { 2050 dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()" 2051 " req_len %d != actual_req_len %d\n", 2052 req_len, actual_req_len); 2053 r = -EIO; 2054 goto out; 2055 } 2056 2057 /* FALL-THROUGH with r == 0 */ 2058out: 2059 return r; 2060} 2061