zd_usb.c

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