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linux/drivers/net/wireless/zd1211rw/zd_usb.c
Jeff Kirsher f47cdae42a zd1211rw: Fix FSF address in file headers 
Several files refer to an old address for the Free Software Foundation
in the file header comment.  Resolve by replacing the address with
the URL <http://www.gnu.org/licenses/> so that we do not have to keep
updating the header comments anytime the address changes.

CC: linux-wireless@vger.kernel.org
CC: Daniel Drake <dsd@gentoo.org>
CC: Ulrich Kunitz <kune@deine-taler.de>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2013-12-11 10:56:19 -05:00

2061 lines
50 KiB
C
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/* ZD1211 USB-WLAN driver for Linux
*
* Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
* Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
* Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/firmware.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/usb.h>
#include <linux/workqueue.h>
#include <linux/module.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>
#include "zd_def.h"
#include "zd_mac.h"
#include "zd_usb.h"
static struct usb_device_id usb_ids[] = {
/* ZD1211 */
{ USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x157e, 0x3207), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
{ USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
/* ZD1211B */
{ USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
{ USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B },
/* "Driverless" devices that need ejecting */
{ USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
{ USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
{}
};
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
MODULE_AUTHOR("Ulrich Kunitz");
MODULE_AUTHOR("Daniel Drake");
MODULE_VERSION("1.0");
MODULE_DEVICE_TABLE(usb, usb_ids);
#define FW_ZD1211_PREFIX "zd1211/zd1211_"
#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req,
unsigned int count);
/* USB device initialization */
static void int_urb_complete(struct urb *urb);
static int request_fw_file(
const struct firmware **fw, const char *name, struct device *device)
{
int r;
dev_dbg_f(device, "fw name %s\n", name);
r = request_firmware(fw, name, device);
if (r)
dev_err(device,
"Could not load firmware file %s. Error number %d\n",
name, r);
return r;
}
static inline u16 get_bcdDevice(const struct usb_device *udev)
{
return le16_to_cpu(udev->descriptor.bcdDevice);
}
enum upload_code_flags {
REBOOT = 1,
};
/* Ensures that MAX_TRANSFER_SIZE is even. */
#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
static int upload_code(struct usb_device *udev,
const u8 *data, size_t size, u16 code_offset, int flags)
{
u8 *p;
int r;
/* USB request blocks need "kmalloced" buffers.
*/
p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
if (!p) {
r = -ENOMEM;
goto error;
}
size &= ~1;
while (size > 0) {
size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
size : MAX_TRANSFER_SIZE;
dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
memcpy(p, data, transfer_size);
r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
USB_REQ_FIRMWARE_DOWNLOAD,
USB_DIR_OUT | USB_TYPE_VENDOR,
code_offset, 0, p, transfer_size, 1000 /* ms */);
if (r < 0) {
dev_err(&udev->dev,
"USB control request for firmware upload"
" failed. Error number %d\n", r);
goto error;
}
transfer_size = r & ~1;
size -= transfer_size;
data += transfer_size;
code_offset += transfer_size/sizeof(u16);
}
if (flags & REBOOT) {
u8 ret;
/* Use "DMA-aware" buffer. */
r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
USB_REQ_FIRMWARE_CONFIRM,
USB_DIR_IN | USB_TYPE_VENDOR,
0, 0, p, sizeof(ret), 5000 /* ms */);
if (r != sizeof(ret)) {
dev_err(&udev->dev,
"control request firmeware confirmation failed."
" Return value %d\n", r);
if (r >= 0)
r = -ENODEV;
goto error;
}
ret = p[0];
if (ret & 0x80) {
dev_err(&udev->dev,
"Internal error while downloading."
" Firmware confirm return value %#04x\n",
(unsigned int)ret);
r = -ENODEV;
goto error;
}
dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
(unsigned int)ret);
}
r = 0;
error:
kfree(p);
return r;
}
static u16 get_word(const void *data, u16 offset)
{
const __le16 *p = data;
return le16_to_cpu(p[offset]);
}
static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
const char* postfix)
{
scnprintf(buffer, size, "%s%s",
usb->is_zd1211b ?
FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
postfix);
return buffer;
}
static int handle_version_mismatch(struct zd_usb *usb,
const struct firmware *ub_fw)
{
struct usb_device *udev = zd_usb_to_usbdev(usb);
const struct firmware *ur_fw = NULL;
int offset;
int r = 0;
char fw_name[128];
r = request_fw_file(&ur_fw,
get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
&udev->dev);
if (r)
goto error;
r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
if (r)
goto error;
offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
/* At this point, the vendor driver downloads the whole firmware
* image, hacks around with version IDs, and uploads it again,
* completely overwriting the boot code. We do not do this here as
* it is not required on any tested devices, and it is suspected to
* cause problems. */
error:
release_firmware(ur_fw);
return r;
}
static int upload_firmware(struct zd_usb *usb)
{
int r;
u16 fw_bcdDevice;
u16 bcdDevice;
struct usb_device *udev = zd_usb_to_usbdev(usb);
const struct firmware *ub_fw = NULL;
const struct firmware *uph_fw = NULL;
char fw_name[128];
bcdDevice = get_bcdDevice(udev);
r = request_fw_file(&ub_fw,
get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
&udev->dev);
if (r)
goto error;
fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
if (fw_bcdDevice != bcdDevice) {
dev_info(&udev->dev,
"firmware version %#06x and device bootcode version "
"%#06x differ\n", fw_bcdDevice, bcdDevice);
if (bcdDevice <= 0x4313)
dev_warn(&udev->dev, "device has old bootcode, please "
"report success or failure\n");
r = handle_version_mismatch(usb, ub_fw);
if (r)
goto error;
} else {
dev_dbg_f(&udev->dev,
"firmware device id %#06x is equal to the "
"actual device id\n", fw_bcdDevice);
}
r = request_fw_file(&uph_fw,
get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
&udev->dev);
if (r)
goto error;
r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
if (r) {
dev_err(&udev->dev,
"Could not upload firmware code uph. Error number %d\n",
r);
}
/* FALL-THROUGH */
error:
release_firmware(ub_fw);
release_firmware(uph_fw);
return r;
}
MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
/* Read data from device address space using "firmware interface" which does
* not require firmware to be loaded. */
int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
{
int r;
struct usb_device *udev = zd_usb_to_usbdev(usb);
u8 *buf;
/* Use "DMA-aware" buffer. */
buf = kmalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
buf, len, 5000);
if (r < 0) {
dev_err(&udev->dev,
"read over firmware interface failed: %d\n", r);
goto exit;
} else if (r != len) {
dev_err(&udev->dev,
"incomplete read over firmware interface: %d/%d\n",
r, len);
r = -EIO;
goto exit;
}
r = 0;
memcpy(data, buf, len);
exit:
kfree(buf);
return r;
}
#define urb_dev(urb) (&(urb)->dev->dev)
static inline void handle_regs_int_override(struct urb *urb)
{
struct zd_usb *usb = urb->context;
struct zd_usb_interrupt *intr = &usb->intr;
spin_lock(&intr->lock);
if (atomic_read(&intr->read_regs_enabled)) {
atomic_set(&intr->read_regs_enabled, 0);
intr->read_regs_int_overridden = 1;
complete(&intr->read_regs.completion);
}
spin_unlock(&intr->lock);
}
static inline void handle_regs_int(struct urb *urb)
{
struct zd_usb *usb = urb->context;
struct zd_usb_interrupt *intr = &usb->intr;
int len;
u16 int_num;
ZD_ASSERT(in_interrupt());
spin_lock(&intr->lock);
int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
if (int_num == CR_INTERRUPT) {
struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
spin_lock(&mac->lock);
memcpy(&mac->intr_buffer, urb->transfer_buffer,
USB_MAX_EP_INT_BUFFER);
spin_unlock(&mac->lock);
schedule_work(&mac->process_intr);
} else if (atomic_read(&intr->read_regs_enabled)) {
len = urb->actual_length;
intr->read_regs.length = urb->actual_length;
if (len > sizeof(intr->read_regs.buffer))
len = sizeof(intr->read_regs.buffer);
memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
/* Sometimes USB_INT_ID_REGS is not overridden, but comes after
* USB_INT_ID_RETRY_FAILED. Read-reg retry then gets this
* delayed USB_INT_ID_REGS, but leaves USB_INT_ID_REGS of
* retry unhandled. Next read-reg command then might catch
* this wrong USB_INT_ID_REGS. Fix by ignoring wrong reads.
*/
if (!check_read_regs(usb, intr->read_regs.req,
intr->read_regs.req_count))
goto out;
atomic_set(&intr->read_regs_enabled, 0);
intr->read_regs_int_overridden = 0;
complete(&intr->read_regs.completion);
goto out;
}
out:
spin_unlock(&intr->lock);
/* CR_INTERRUPT might override read_reg too. */
if (int_num == CR_INTERRUPT && atomic_read(&intr->read_regs_enabled))
handle_regs_int_override(urb);
}
static void int_urb_complete(struct urb *urb)
{
int r;
struct usb_int_header *hdr;
struct zd_usb *usb;
struct zd_usb_interrupt *intr;
switch (urb->status) {
case 0:
break;
case -ESHUTDOWN:
case -EINVAL:
case -ENODEV:
case -ENOENT:
case -ECONNRESET:
case -EPIPE:
dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
return;
default:
dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
goto resubmit;
}
if (urb->actual_length < sizeof(hdr)) {
dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
goto resubmit;
}
hdr = urb->transfer_buffer;
if (hdr->type != USB_INT_TYPE) {
dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
goto resubmit;
}
/* USB_INT_ID_RETRY_FAILED triggered by tx-urb submit can override
* pending USB_INT_ID_REGS causing read command timeout.
*/
usb = urb->context;
intr = &usb->intr;
if (hdr->id != USB_INT_ID_REGS && atomic_read(&intr->read_regs_enabled))
handle_regs_int_override(urb);
switch (hdr->id) {
case USB_INT_ID_REGS:
handle_regs_int(urb);
break;
case USB_INT_ID_RETRY_FAILED:
zd_mac_tx_failed(urb);
break;
default:
dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
(unsigned int)hdr->id);
goto resubmit;
}
resubmit:
r = usb_submit_urb(urb, GFP_ATOMIC);
if (r) {
dev_dbg_f(urb_dev(urb), "error: resubmit urb %p err code %d\n",
urb, r);
/* TODO: add worker to reset intr->urb */
}
return;
}
static inline int int_urb_interval(struct usb_device *udev)
{
switch (udev->speed) {
case USB_SPEED_HIGH:
return 4;
case USB_SPEED_LOW:
return 10;
case USB_SPEED_FULL:
default:
return 1;
}
}
static inline int usb_int_enabled(struct zd_usb *usb)
{
unsigned long flags;
struct zd_usb_interrupt *intr = &usb->intr;
struct urb *urb;
spin_lock_irqsave(&intr->lock, flags);
urb = intr->urb;
spin_unlock_irqrestore(&intr->lock, flags);
return urb != NULL;
}
int zd_usb_enable_int(struct zd_usb *usb)
{
int r;
struct usb_device *udev = zd_usb_to_usbdev(usb);
struct zd_usb_interrupt *intr = &usb->intr;
struct urb *urb;
dev_dbg_f(zd_usb_dev(usb), "\n");
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
r = -ENOMEM;
goto out;
}
ZD_ASSERT(!irqs_disabled());
spin_lock_irq(&intr->lock);
if (intr->urb) {
spin_unlock_irq(&intr->lock);
r = 0;
goto error_free_urb;
}
intr->urb = urb;
spin_unlock_irq(&intr->lock);
r = -ENOMEM;
intr->buffer = usb_alloc_coherent(udev, USB_MAX_EP_INT_BUFFER,
GFP_KERNEL, &intr->buffer_dma);
if (!intr->buffer) {
dev_dbg_f(zd_usb_dev(usb),
"couldn't allocate transfer_buffer\n");
goto error_set_urb_null;
}
usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
intr->buffer, USB_MAX_EP_INT_BUFFER,
int_urb_complete, usb,
intr->interval);
urb->transfer_dma = intr->buffer_dma;
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
r = usb_submit_urb(urb, GFP_KERNEL);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
"Couldn't submit urb. Error number %d\n", r);
goto error;
}
return 0;
error:
usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
intr->buffer, intr->buffer_dma);
error_set_urb_null:
spin_lock_irq(&intr->lock);
intr->urb = NULL;
spin_unlock_irq(&intr->lock);
error_free_urb:
usb_free_urb(urb);
out:
return r;
}
void zd_usb_disable_int(struct zd_usb *usb)
{
unsigned long flags;
struct usb_device *udev = zd_usb_to_usbdev(usb);
struct zd_usb_interrupt *intr = &usb->intr;
struct urb *urb;
void *buffer;
dma_addr_t buffer_dma;
spin_lock_irqsave(&intr->lock, flags);
urb = intr->urb;
if (!urb) {
spin_unlock_irqrestore(&intr->lock, flags);
return;
}
intr->urb = NULL;
buffer = intr->buffer;
buffer_dma = intr->buffer_dma;
intr->buffer = NULL;
spin_unlock_irqrestore(&intr->lock, flags);
usb_kill_urb(urb);
dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
usb_free_urb(urb);
if (buffer)
usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
buffer, buffer_dma);
}
static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
unsigned int length)
{
int i;
const struct rx_length_info *length_info;
if (length < sizeof(struct rx_length_info)) {
/* It's not a complete packet anyhow. */
dev_dbg_f(zd_usb_dev(usb), "invalid, small RX packet : %d\n",
length);
return;
}
length_info = (struct rx_length_info *)
(buffer + length - sizeof(struct rx_length_info));
/* It might be that three frames are merged into a single URB
* transaction. We have to check for the length info tag.
*
* While testing we discovered that length_info might be unaligned,
* because if USB transactions are merged, the last packet will not
* be padded. Unaligned access might also happen if the length_info
* structure is not present.
*/
if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
{
unsigned int l, k, n;
for (i = 0, l = 0;; i++) {
k = get_unaligned_le16(&length_info->length[i]);
if (k == 0)
return;
n = l+k;
if (n > length)
return;
zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
if (i >= 2)
return;
l = (n+3) & ~3;
}
} else {
zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
}
}
static void rx_urb_complete(struct urb *urb)
{
int r;
struct zd_usb *usb;
struct zd_usb_rx *rx;
const u8 *buffer;
unsigned int length;
switch (urb->status) {
case 0:
break;
case -ESHUTDOWN:
case -EINVAL:
case -ENODEV:
case -ENOENT:
case -ECONNRESET:
case -EPIPE:
dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
return;
default:
dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
goto resubmit;
}
buffer = urb->transfer_buffer;
length = urb->actual_length;
usb = urb->context;
rx = &usb->rx;
tasklet_schedule(&rx->reset_timer_tasklet);
if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
/* If there is an old first fragment, we don't care. */
dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
spin_lock(&rx->lock);
memcpy(rx->fragment, buffer, length);
rx->fragment_length = length;
spin_unlock(&rx->lock);
goto resubmit;
}
spin_lock(&rx->lock);
if (rx->fragment_length > 0) {
/* We are on a second fragment, we believe */
ZD_ASSERT(length + rx->fragment_length <=
ARRAY_SIZE(rx->fragment));
dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
memcpy(rx->fragment+rx->fragment_length, buffer, length);
handle_rx_packet(usb, rx->fragment,
rx->fragment_length + length);
rx->fragment_length = 0;
spin_unlock(&rx->lock);
} else {
spin_unlock(&rx->lock);
handle_rx_packet(usb, buffer, length);
}
resubmit:
r = usb_submit_urb(urb, GFP_ATOMIC);
if (r)
dev_dbg_f(urb_dev(urb), "urb %p resubmit error %d\n", urb, r);
}
static struct urb *alloc_rx_urb(struct zd_usb *usb)
{
struct usb_device *udev = zd_usb_to_usbdev(usb);
struct urb *urb;
void *buffer;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
return NULL;
buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
&urb->transfer_dma);
if (!buffer) {
usb_free_urb(urb);
return NULL;
}
usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
buffer, USB_MAX_RX_SIZE,
rx_urb_complete, usb);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
return urb;
}
static void free_rx_urb(struct urb *urb)
{
if (!urb)
return;
usb_free_coherent(urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
usb_free_urb(urb);
}
static int __zd_usb_enable_rx(struct zd_usb *usb)
{
int i, r;
struct zd_usb_rx *rx = &usb->rx;
struct urb **urbs;
dev_dbg_f(zd_usb_dev(usb), "\n");
r = -ENOMEM;
urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
if (!urbs)
goto error;
for (i = 0; i < RX_URBS_COUNT; i++) {
urbs[i] = alloc_rx_urb(usb);
if (!urbs[i])
goto error;
}
ZD_ASSERT(!irqs_disabled());
spin_lock_irq(&rx->lock);
if (rx->urbs) {
spin_unlock_irq(&rx->lock);
r = 0;
goto error;
}
rx->urbs = urbs;
rx->urbs_count = RX_URBS_COUNT;
spin_unlock_irq(&rx->lock);
for (i = 0; i < RX_URBS_COUNT; i++) {
r = usb_submit_urb(urbs[i], GFP_KERNEL);
if (r)
goto error_submit;
}
return 0;
error_submit:
for (i = 0; i < RX_URBS_COUNT; i++) {
usb_kill_urb(urbs[i]);
}
spin_lock_irq(&rx->lock);
rx->urbs = NULL;
rx->urbs_count = 0;
spin_unlock_irq(&rx->lock);
error:
if (urbs) {
for (i = 0; i < RX_URBS_COUNT; i++)
free_rx_urb(urbs[i]);
}
return r;
}
int zd_usb_enable_rx(struct zd_usb *usb)
{
int r;
struct zd_usb_rx *rx = &usb->rx;
mutex_lock(&rx->setup_mutex);
r = __zd_usb_enable_rx(usb);
mutex_unlock(&rx->setup_mutex);
zd_usb_reset_rx_idle_timer(usb);
return r;
}
static void __zd_usb_disable_rx(struct zd_usb *usb)
{
int i;
unsigned long flags;
struct urb **urbs;
unsigned int count;
struct zd_usb_rx *rx = &usb->rx;
spin_lock_irqsave(&rx->lock, flags);
urbs = rx->urbs;
count = rx->urbs_count;
spin_unlock_irqrestore(&rx->lock, flags);
if (!urbs)
return;
for (i = 0; i < count; i++) {
usb_kill_urb(urbs[i]);
free_rx_urb(urbs[i]);
}
kfree(urbs);
spin_lock_irqsave(&rx->lock, flags);
rx->urbs = NULL;
rx->urbs_count = 0;
spin_unlock_irqrestore(&rx->lock, flags);
}
void zd_usb_disable_rx(struct zd_usb *usb)
{
struct zd_usb_rx *rx = &usb->rx;
mutex_lock(&rx->setup_mutex);
__zd_usb_disable_rx(usb);
mutex_unlock(&rx->setup_mutex);
tasklet_kill(&rx->reset_timer_tasklet);
cancel_delayed_work_sync(&rx->idle_work);
}
static void zd_usb_reset_rx(struct zd_usb *usb)
{
bool do_reset;
struct zd_usb_rx *rx = &usb->rx;
unsigned long flags;
mutex_lock(&rx->setup_mutex);
spin_lock_irqsave(&rx->lock, flags);
do_reset = rx->urbs != NULL;
spin_unlock_irqrestore(&rx->lock, flags);
if (do_reset) {
__zd_usb_disable_rx(usb);
__zd_usb_enable_rx(usb);
}
mutex_unlock(&rx->setup_mutex);
if (do_reset)
zd_usb_reset_rx_idle_timer(usb);
}
/**
* zd_usb_disable_tx - disable transmission
* @usb: the zd1211rw-private USB structure
*
* Frees all URBs in the free list and marks the transmission as disabled.
*/
void zd_usb_disable_tx(struct zd_usb *usb)
{
struct zd_usb_tx *tx = &usb->tx;
unsigned long flags;
atomic_set(&tx->enabled, 0);
/* kill all submitted tx-urbs */
usb_kill_anchored_urbs(&tx->submitted);
spin_lock_irqsave(&tx->lock, flags);
WARN_ON(!skb_queue_empty(&tx->submitted_skbs));
WARN_ON(tx->submitted_urbs != 0);
tx->submitted_urbs = 0;
spin_unlock_irqrestore(&tx->lock, flags);
/* The stopped state is ignored, relying on ieee80211_wake_queues()
* in a potentionally following zd_usb_enable_tx().
*/
}
/**
* zd_usb_enable_tx - enables transmission
* @usb: a &struct zd_usb pointer
*
* This function enables transmission and prepares the &zd_usb_tx data
* structure.
*/
void zd_usb_enable_tx(struct zd_usb *usb)
{
unsigned long flags;
struct zd_usb_tx *tx = &usb->tx;
spin_lock_irqsave(&tx->lock, flags);
atomic_set(&tx->enabled, 1);
tx->submitted_urbs = 0;
ieee80211_wake_queues(zd_usb_to_hw(usb));
tx->stopped = 0;
spin_unlock_irqrestore(&tx->lock, flags);
}
static void tx_dec_submitted_urbs(struct zd_usb *usb)
{
struct zd_usb_tx *tx = &usb->tx;
unsigned long flags;
spin_lock_irqsave(&tx->lock, flags);
--tx->submitted_urbs;
if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
ieee80211_wake_queues(zd_usb_to_hw(usb));
tx->stopped = 0;
}
spin_unlock_irqrestore(&tx->lock, flags);
}
static void tx_inc_submitted_urbs(struct zd_usb *usb)
{
struct zd_usb_tx *tx = &usb->tx;
unsigned long flags;
spin_lock_irqsave(&tx->lock, flags);
++tx->submitted_urbs;
if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
ieee80211_stop_queues(zd_usb_to_hw(usb));
tx->stopped = 1;
}
spin_unlock_irqrestore(&tx->lock, flags);
}
/**
* tx_urb_complete - completes the execution of an URB
* @urb: a URB
*
* This function is called if the URB has been transferred to a device or an
* error has happened.
*/
static void tx_urb_complete(struct urb *urb)
{
int r;
struct sk_buff *skb;
struct ieee80211_tx_info *info;
struct zd_usb *usb;
struct zd_usb_tx *tx;
skb = (struct sk_buff *)urb->context;
info = IEEE80211_SKB_CB(skb);
/*
* grab 'usb' pointer before handing off the skb (since
* it might be freed by zd_mac_tx_to_dev or mac80211)
*/
usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
tx = &usb->tx;
switch (urb->status) {
case 0:
break;
case -ESHUTDOWN:
case -EINVAL:
case -ENODEV:
case -ENOENT:
case -ECONNRESET:
case -EPIPE:
dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
break;
default:
dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
goto resubmit;
}
free_urb:
skb_unlink(skb, &usb->tx.submitted_skbs);
zd_mac_tx_to_dev(skb, urb->status);
usb_free_urb(urb);
tx_dec_submitted_urbs(usb);
return;
resubmit:
usb_anchor_urb(urb, &tx->submitted);
r = usb_submit_urb(urb, GFP_ATOMIC);
if (r) {
usb_unanchor_urb(urb);
dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
goto free_urb;
}
}
/**
* zd_usb_tx: initiates transfer of a frame of the device
*
* @usb: the zd1211rw-private USB structure
* @skb: a &struct sk_buff pointer
*
* This function tranmits a frame to the device. It doesn't wait for
* completion. The frame must contain the control set and have all the
* control set information available.
*
* The function returns 0 if the transfer has been successfully initiated.
*/
int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
{
int r;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct usb_device *udev = zd_usb_to_usbdev(usb);
struct urb *urb;
struct zd_usb_tx *tx = &usb->tx;
if (!atomic_read(&tx->enabled)) {
r = -ENOENT;
goto out;
}
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
r = -ENOMEM;
goto out;
}
usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
skb->data, skb->len, tx_urb_complete, skb);
info->rate_driver_data[1] = (void *)jiffies;
skb_queue_tail(&tx->submitted_skbs, skb);
usb_anchor_urb(urb, &tx->submitted);
r = usb_submit_urb(urb, GFP_ATOMIC);
if (r) {
dev_dbg_f(zd_usb_dev(usb), "error submit urb %p %d\n", urb, r);
usb_unanchor_urb(urb);
skb_unlink(skb, &tx->submitted_skbs);
goto error;
}
tx_inc_submitted_urbs(usb);
return 0;
error:
usb_free_urb(urb);
out:
return r;
}
static bool zd_tx_timeout(struct zd_usb *usb)
{
struct zd_usb_tx *tx = &usb->tx;
struct sk_buff_head *q = &tx->submitted_skbs;
struct sk_buff *skb, *skbnext;
struct ieee80211_tx_info *info;
unsigned long flags, trans_start;
bool have_timedout = false;
spin_lock_irqsave(&q->lock, flags);
skb_queue_walk_safe(q, skb, skbnext) {
info = IEEE80211_SKB_CB(skb);
trans_start = (unsigned long)info->rate_driver_data[1];
if (time_is_before_jiffies(trans_start + ZD_TX_TIMEOUT)) {
have_timedout = true;
break;
}
}
spin_unlock_irqrestore(&q->lock, flags);
return have_timedout;
}
static void zd_tx_watchdog_handler(struct work_struct *work)
{
struct zd_usb *usb =
container_of(work, struct zd_usb, tx.watchdog_work.work);
struct zd_usb_tx *tx = &usb->tx;
if (!atomic_read(&tx->enabled) || !tx->watchdog_enabled)
goto out;
if (!zd_tx_timeout(usb))
goto out;
/* TX halted, try reset */
dev_warn(zd_usb_dev(usb), "TX-stall detected, resetting device...");
usb_queue_reset_device(usb->intf);
/* reset will stop this worker, don't rearm */
return;
out:
queue_delayed_work(zd_workqueue, &tx->watchdog_work,
ZD_TX_WATCHDOG_INTERVAL);
}
void zd_tx_watchdog_enable(struct zd_usb *usb)
{
struct zd_usb_tx *tx = &usb->tx;
if (!tx->watchdog_enabled) {
dev_dbg_f(zd_usb_dev(usb), "\n");
queue_delayed_work(zd_workqueue, &tx->watchdog_work,
ZD_TX_WATCHDOG_INTERVAL);
tx->watchdog_enabled = 1;
}
}
void zd_tx_watchdog_disable(struct zd_usb *usb)
{
struct zd_usb_tx *tx = &usb->tx;
if (tx->watchdog_enabled) {
dev_dbg_f(zd_usb_dev(usb), "\n");
tx->watchdog_enabled = 0;
cancel_delayed_work_sync(&tx->watchdog_work);
}
}
static void zd_rx_idle_timer_handler(struct work_struct *work)
{
struct zd_usb *usb =
container_of(work, struct zd_usb, rx.idle_work.work);
struct zd_mac *mac = zd_usb_to_mac(usb);
if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
return;
dev_dbg_f(zd_usb_dev(usb), "\n");
/* 30 seconds since last rx, reset rx */
zd_usb_reset_rx(usb);
}
static void zd_usb_reset_rx_idle_timer_tasklet(unsigned long param)
{
struct zd_usb *usb = (struct zd_usb *)param;
zd_usb_reset_rx_idle_timer(usb);
}
void zd_usb_reset_rx_idle_timer(struct zd_usb *usb)
{
struct zd_usb_rx *rx = &usb->rx;
mod_delayed_work(zd_workqueue, &rx->idle_work, ZD_RX_IDLE_INTERVAL);
}
static inline void init_usb_interrupt(struct zd_usb *usb)
{
struct zd_usb_interrupt *intr = &usb->intr;
spin_lock_init(&intr->lock);
intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
init_completion(&intr->read_regs.completion);
atomic_set(&intr->read_regs_enabled, 0);
intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
}
static inline void init_usb_rx(struct zd_usb *usb)
{
struct zd_usb_rx *rx = &usb->rx;
spin_lock_init(&rx->lock);
mutex_init(&rx->setup_mutex);
if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
rx->usb_packet_size = 512;
} else {
rx->usb_packet_size = 64;
}
ZD_ASSERT(rx->fragment_length == 0);
INIT_DELAYED_WORK(&rx->idle_work, zd_rx_idle_timer_handler);
rx->reset_timer_tasklet.func = zd_usb_reset_rx_idle_timer_tasklet;
rx->reset_timer_tasklet.data = (unsigned long)usb;
}
static inline void init_usb_tx(struct zd_usb *usb)
{
struct zd_usb_tx *tx = &usb->tx;
spin_lock_init(&tx->lock);
atomic_set(&tx->enabled, 0);
tx->stopped = 0;
skb_queue_head_init(&tx->submitted_skbs);
init_usb_anchor(&tx->submitted);
tx->submitted_urbs = 0;
tx->watchdog_enabled = 0;
INIT_DELAYED_WORK(&tx->watchdog_work, zd_tx_watchdog_handler);
}
void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
struct usb_interface *intf)
{
memset(usb, 0, sizeof(*usb));
usb->intf = usb_get_intf(intf);
usb_set_intfdata(usb->intf, hw);
init_usb_anchor(&usb->submitted_cmds);
init_usb_interrupt(usb);
init_usb_tx(usb);
init_usb_rx(usb);
}
void zd_usb_clear(struct zd_usb *usb)
{
usb_set_intfdata(usb->intf, NULL);
usb_put_intf(usb->intf);
ZD_MEMCLEAR(usb, sizeof(*usb));
/* FIXME: usb_interrupt, usb_tx, usb_rx? */
}
static const char *speed(enum usb_device_speed speed)
{
switch (speed) {
case USB_SPEED_LOW:
return "low";
case USB_SPEED_FULL:
return "full";
case USB_SPEED_HIGH:
return "high";
default:
return "unknown speed";
}
}
static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
{
return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct),
get_bcdDevice(udev),
speed(udev->speed));
}
int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
{
struct usb_device *udev = interface_to_usbdev(usb->intf);
return scnprint_id(udev, buffer, size);
}
#ifdef DEBUG
static void print_id(struct usb_device *udev)
{
char buffer[40];
scnprint_id(udev, buffer, sizeof(buffer));
buffer[sizeof(buffer)-1] = 0;
dev_dbg_f(&udev->dev, "%s\n", buffer);
}
#else
#define print_id(udev) do { } while (0)
#endif
static int eject_installer(struct usb_interface *intf)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_host_interface *iface_desc = &intf->altsetting[0];
struct usb_endpoint_descriptor *endpoint;
unsigned char *cmd;
u8 bulk_out_ep;
int r;
/* Find bulk out endpoint */
for (r = 1; r >= 0; r--) {
endpoint = &iface_desc->endpoint[r].desc;
if (usb_endpoint_dir_out(endpoint) &&
usb_endpoint_xfer_bulk(endpoint)) {
bulk_out_ep = endpoint->bEndpointAddress;
break;
}
}
if (r == -1) {
dev_err(&udev->dev,
"zd1211rw: Could not find bulk out endpoint\n");
return -ENODEV;
}
cmd = kzalloc(31, GFP_KERNEL);
if (cmd == NULL)
return -ENODEV;
/* USB bulk command block */
cmd[0] = 0x55; /* bulk command signature */
cmd[1] = 0x53; /* bulk command signature */
cmd[2] = 0x42; /* bulk command signature */
cmd[3] = 0x43; /* bulk command signature */
cmd[14] = 6; /* command length */
cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
cmd[19] = 0x2; /* eject disc */
dev_info(&udev->dev, "Ejecting virtual installer media...\n");
r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
cmd, 31, NULL, 2000);
kfree(cmd);
if (r)
return r;
/* At this point, the device disconnects and reconnects with the real
* ID numbers. */
usb_set_intfdata(intf, NULL);
return 0;
}
int zd_usb_init_hw(struct zd_usb *usb)
{
int r;
struct zd_mac *mac = zd_usb_to_mac(usb);
dev_dbg_f(zd_usb_dev(usb), "\n");
r = upload_firmware(usb);
if (r) {
dev_err(zd_usb_dev(usb),
"couldn't load firmware. Error number %d\n", r);
return r;
}
r = usb_reset_configuration(zd_usb_to_usbdev(usb));
if (r) {
dev_dbg_f(zd_usb_dev(usb),
"couldn't reset configuration. Error number %d\n", r);
return r;
}
r = zd_mac_init_hw(mac->hw);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
"couldn't initialize mac. Error number %d\n", r);
return r;
}
usb->initialized = 1;
return 0;
}
static int probe(struct usb_interface *intf, const struct usb_device_id *id)
{
int r;
struct usb_device *udev = interface_to_usbdev(intf);
struct zd_usb *usb;
struct ieee80211_hw *hw = NULL;
print_id(udev);
if (id->driver_info & DEVICE_INSTALLER)
return eject_installer(intf);
switch (udev->speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
case USB_SPEED_HIGH:
break;
default:
dev_dbg_f(&intf->dev, "Unknown USB speed\n");
r = -ENODEV;
goto error;
}
r = usb_reset_device(udev);
if (r) {
dev_err(&intf->dev,
"couldn't reset usb device. Error number %d\n", r);
goto error;
}
hw = zd_mac_alloc_hw(intf);
if (hw == NULL) {
r = -ENOMEM;
goto error;
}
usb = &zd_hw_mac(hw)->chip.usb;
usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
r = zd_mac_preinit_hw(hw);
if (r) {
dev_dbg_f(&intf->dev,
"couldn't initialize mac. Error number %d\n", r);
goto error;
}
r = ieee80211_register_hw(hw);
if (r) {
dev_dbg_f(&intf->dev,
"couldn't register device. Error number %d\n", r);
goto error;
}
dev_dbg_f(&intf->dev, "successful\n");
dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
return 0;
error:
usb_reset_device(interface_to_usbdev(intf));
if (hw) {
zd_mac_clear(zd_hw_mac(hw));
ieee80211_free_hw(hw);
}
return r;
}
static void disconnect(struct usb_interface *intf)
{
struct ieee80211_hw *hw = zd_intf_to_hw(intf);
struct zd_mac *mac;
struct zd_usb *usb;
/* Either something really bad happened, or we're just dealing with
* a DEVICE_INSTALLER. */
if (hw == NULL)
return;
mac = zd_hw_mac(hw);
usb = &mac->chip.usb;
dev_dbg_f(zd_usb_dev(usb), "\n");
ieee80211_unregister_hw(hw);
/* Just in case something has gone wrong! */
zd_usb_disable_tx(usb);
zd_usb_disable_rx(usb);
zd_usb_disable_int(usb);
/* If the disconnect has been caused by a removal of the
* driver module, the reset allows reloading of the driver. If the
* reset will not be executed here, the upload of the firmware in the
* probe function caused by the reloading of the driver will fail.
*/
usb_reset_device(interface_to_usbdev(intf));
zd_mac_clear(mac);
ieee80211_free_hw(hw);
dev_dbg(&intf->dev, "disconnected\n");
}
static void zd_usb_resume(struct zd_usb *usb)
{
struct zd_mac *mac = zd_usb_to_mac(usb);
int r;
dev_dbg_f(zd_usb_dev(usb), "\n");
r = zd_op_start(zd_usb_to_hw(usb));
if (r < 0) {
dev_warn(zd_usb_dev(usb), "Device resume failed "
"with error code %d. Retrying...\n", r);
if (usb->was_running)
set_bit(ZD_DEVICE_RUNNING, &mac->flags);
usb_queue_reset_device(usb->intf);
return;
}
if (mac->type != NL80211_IFTYPE_UNSPECIFIED) {
r = zd_restore_settings(mac);
if (r < 0) {
dev_dbg(zd_usb_dev(usb),
"failed to restore settings, %d\n", r);
return;
}
}
}
static void zd_usb_stop(struct zd_usb *usb)
{
dev_dbg_f(zd_usb_dev(usb), "\n");
zd_op_stop(zd_usb_to_hw(usb));
zd_usb_disable_tx(usb);
zd_usb_disable_rx(usb);
zd_usb_disable_int(usb);
usb->initialized = 0;
}
static int pre_reset(struct usb_interface *intf)
{
struct ieee80211_hw *hw = usb_get_intfdata(intf);
struct zd_mac *mac;
struct zd_usb *usb;
if (!hw || intf->condition != USB_INTERFACE_BOUND)
return 0;
mac = zd_hw_mac(hw);
usb = &mac->chip.usb;
usb->was_running = test_bit(ZD_DEVICE_RUNNING, &mac->flags);
zd_usb_stop(usb);
mutex_lock(&mac->chip.mutex);
return 0;
}
static int post_reset(struct usb_interface *intf)
{
struct ieee80211_hw *hw = usb_get_intfdata(intf);
struct zd_mac *mac;
struct zd_usb *usb;
if (!hw || intf->condition != USB_INTERFACE_BOUND)
return 0;
mac = zd_hw_mac(hw);
usb = &mac->chip.usb;
mutex_unlock(&mac->chip.mutex);
if (usb->was_running)
zd_usb_resume(usb);
return 0;
}
static struct usb_driver driver = {
.name = KBUILD_MODNAME,
.id_table = usb_ids,
.probe = probe,
.disconnect = disconnect,
.pre_reset = pre_reset,
.post_reset = post_reset,
.disable_hub_initiated_lpm = 1,
};
struct workqueue_struct *zd_workqueue;
static int __init usb_init(void)
{
int r;
pr_debug("%s usb_init()\n", driver.name);
zd_workqueue = create_singlethread_workqueue(driver.name);
if (zd_workqueue == NULL) {
printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
return -ENOMEM;
}
r = usb_register(&driver);
if (r) {
destroy_workqueue(zd_workqueue);
printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
driver.name, r);
return r;
}
pr_debug("%s initialized\n", driver.name);
return 0;
}
static void __exit usb_exit(void)
{
pr_debug("%s usb_exit()\n", driver.name);
usb_deregister(&driver);
destroy_workqueue(zd_workqueue);
}
module_init(usb_init);
module_exit(usb_exit);
static int zd_ep_regs_out_msg(struct usb_device *udev, void *data, int len,
int *actual_length, int timeout)
{
/* In USB 2.0 mode EP_REGS_OUT endpoint is interrupt type. However in
* USB 1.1 mode endpoint is bulk. Select correct type URB by endpoint
* descriptor.
*/
struct usb_host_endpoint *ep;
unsigned int pipe;
pipe = usb_sndintpipe(udev, EP_REGS_OUT);
ep = usb_pipe_endpoint(udev, pipe);
if (!ep)
return -EINVAL;
if (usb_endpoint_xfer_int(&ep->desc)) {
return usb_interrupt_msg(udev, pipe, data, len,
actual_length, timeout);
} else {
pipe = usb_sndbulkpipe(udev, EP_REGS_OUT);
return usb_bulk_msg(udev, pipe, data, len, actual_length,
timeout);
}
}
static int usb_int_regs_length(unsigned int count)
{
return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
}
static void prepare_read_regs_int(struct zd_usb *usb,
struct usb_req_read_regs *req,
unsigned int count)
{
struct zd_usb_interrupt *intr = &usb->intr;
spin_lock_irq(&intr->lock);
atomic_set(&intr->read_regs_enabled, 1);
intr->read_regs.req = req;
intr->read_regs.req_count = count;
reinit_completion(&intr->read_regs.completion);
spin_unlock_irq(&intr->lock);
}
static void disable_read_regs_int(struct zd_usb *usb)
{
struct zd_usb_interrupt *intr = &usb->intr;
spin_lock_irq(&intr->lock);
atomic_set(&intr->read_regs_enabled, 0);
spin_unlock_irq(&intr->lock);
}
static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req,
unsigned int count)
{
int i;
struct zd_usb_interrupt *intr = &usb->intr;
struct read_regs_int *rr = &intr->read_regs;
struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
/* The created block size seems to be larger than expected.
* However results appear to be correct.
*/
if (rr->length < usb_int_regs_length(count)) {
dev_dbg_f(zd_usb_dev(usb),
"error: actual length %d less than expected %d\n",
rr->length, usb_int_regs_length(count));
return false;
}
if (rr->length > sizeof(rr->buffer)) {
dev_dbg_f(zd_usb_dev(usb),
"error: actual length %d exceeds buffer size %zu\n",
rr->length, sizeof(rr->buffer));
return false;
}
for (i = 0; i < count; i++) {
struct reg_data *rd = &regs->regs[i];
if (rd->addr != req->addr[i]) {
dev_dbg_f(zd_usb_dev(usb),
"rd[%d] addr %#06hx expected %#06hx\n", i,
le16_to_cpu(rd->addr),
le16_to_cpu(req->addr[i]));
return false;
}
}
return true;
}
static int get_results(struct zd_usb *usb, u16 *values,
struct usb_req_read_regs *req, unsigned int count,
bool *retry)
{
int r;
int i;
struct zd_usb_interrupt *intr = &usb->intr;
struct read_regs_int *rr = &intr->read_regs;
struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
spin_lock_irq(&intr->lock);
r = -EIO;
/* Read failed because firmware bug? */
*retry = !!intr->read_regs_int_overridden;
if (*retry)
goto error_unlock;
if (!check_read_regs(usb, req, count)) {
dev_dbg_f(zd_usb_dev(usb), "error: invalid read regs\n");
goto error_unlock;
}
for (i = 0; i < count; i++) {
struct reg_data *rd = &regs->regs[i];
values[i] = le16_to_cpu(rd->value);
}
r = 0;
error_unlock:
spin_unlock_irq(&intr->lock);
return r;
}
int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
const zd_addr_t *addresses, unsigned int count)
{
int r, i, req_len, actual_req_len, try_count = 0;
struct usb_device *udev;
struct usb_req_read_regs *req = NULL;
unsigned long timeout;
bool retry = false;
if (count < 1) {
dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
return -EINVAL;
}
if (count > USB_MAX_IOREAD16_COUNT) {
dev_dbg_f(zd_usb_dev(usb),
"error: count %u exceeds possible max %u\n",
count, USB_MAX_IOREAD16_COUNT);
return -EINVAL;
}
if (in_atomic()) {
dev_dbg_f(zd_usb_dev(usb),
"error: io in atomic context not supported\n");
return -EWOULDBLOCK;
}
if (!usb_int_enabled(usb)) {
dev_dbg_f(zd_usb_dev(usb),
"error: usb interrupt not enabled\n");
return -EWOULDBLOCK;
}
ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
BUILD_BUG_ON(sizeof(struct usb_req_read_regs) + USB_MAX_IOREAD16_COUNT *
sizeof(__le16) > sizeof(usb->req_buf));
BUG_ON(sizeof(struct usb_req_read_regs) + count * sizeof(__le16) >
sizeof(usb->req_buf));
req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
req = (void *)usb->req_buf;
req->id = cpu_to_le16(USB_REQ_READ_REGS);
for (i = 0; i < count; i++)
req->addr[i] = cpu_to_le16((u16)addresses[i]);
retry_read:
try_count++;
udev = zd_usb_to_usbdev(usb);
prepare_read_regs_int(usb, req, count);
r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
"error in zd_ep_regs_out_msg(). Error number %d\n", r);
goto error;
}
if (req_len != actual_req_len) {
dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()\n"
" req_len %d != actual_req_len %d\n",
req_len, actual_req_len);
r = -EIO;
goto error;
}
timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
msecs_to_jiffies(50));
if (!timeout) {
disable_read_regs_int(usb);
dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
r = -ETIMEDOUT;
goto error;
}
r = get_results(usb, values, req, count, &retry);
if (retry && try_count < 20) {
dev_dbg_f(zd_usb_dev(usb), "read retry, tries so far: %d\n",
try_count);
goto retry_read;
}
error:
return r;
}
static void iowrite16v_urb_complete(struct urb *urb)
{
struct zd_usb *usb = urb->context;
if (urb->status && !usb->cmd_error)
usb->cmd_error = urb->status;
if (!usb->cmd_error &&
urb->actual_length != urb->transfer_buffer_length)
usb->cmd_error = -EIO;
}
static int zd_submit_waiting_urb(struct zd_usb *usb, bool last)
{
int r = 0;
struct urb *urb = usb->urb_async_waiting;
if (!urb)
return 0;
usb->urb_async_waiting = NULL;
if (!last)
urb->transfer_flags |= URB_NO_INTERRUPT;
usb_anchor_urb(urb, &usb->submitted_cmds);
r = usb_submit_urb(urb, GFP_KERNEL);
if (r) {
usb_unanchor_urb(urb);
dev_dbg_f(zd_usb_dev(usb),
"error in usb_submit_urb(). Error number %d\n", r);
goto error;
}
/* fall-through with r == 0 */
error:
usb_free_urb(urb);
return r;
}
void zd_usb_iowrite16v_async_start(struct zd_usb *usb)
{
ZD_ASSERT(usb_anchor_empty(&usb->submitted_cmds));
ZD_ASSERT(usb->urb_async_waiting == NULL);
ZD_ASSERT(!usb->in_async);
ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
usb->in_async = 1;
usb->cmd_error = 0;
usb->urb_async_waiting = NULL;
}
int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout)
{
int r;
ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
ZD_ASSERT(usb->in_async);
/* Submit last iowrite16v URB */
r = zd_submit_waiting_urb(usb, true);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
"error in zd_submit_waiting_usb(). "
"Error number %d\n", r);
usb_kill_anchored_urbs(&usb->submitted_cmds);
goto error;
}
if (timeout)
timeout = usb_wait_anchor_empty_timeout(&usb->submitted_cmds,
timeout);
if (!timeout) {
usb_kill_anchored_urbs(&usb->submitted_cmds);
if (usb->cmd_error == -ENOENT) {
dev_dbg_f(zd_usb_dev(usb), "timed out");
r = -ETIMEDOUT;
goto error;
}
}
r = usb->cmd_error;
error:
usb->in_async = 0;
return r;
}
int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
unsigned int count)
{
int r;
struct usb_device *udev;
struct usb_req_write_regs *req = NULL;
int i, req_len;
struct urb *urb;
struct usb_host_endpoint *ep;
ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
ZD_ASSERT(usb->in_async);
if (count == 0)
return 0;
if (count > USB_MAX_IOWRITE16_COUNT) {
dev_dbg_f(zd_usb_dev(usb),
"error: count %u exceeds possible max %u\n",
count, USB_MAX_IOWRITE16_COUNT);
return -EINVAL;
}
if (in_atomic()) {
dev_dbg_f(zd_usb_dev(usb),
"error: io in atomic context not supported\n");
return -EWOULDBLOCK;
}
udev = zd_usb_to_usbdev(usb);
ep = usb_pipe_endpoint(udev, usb_sndintpipe(udev, EP_REGS_OUT));
if (!ep)
return -ENOENT;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
return -ENOMEM;
req_len = sizeof(struct usb_req_write_regs) +
count * sizeof(struct reg_data);
req = kmalloc(req_len, GFP_KERNEL);
if (!req) {
r = -ENOMEM;
goto error;
}
req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
for (i = 0; i < count; i++) {
struct reg_data *rw = &req->reg_writes[i];
rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
rw->value = cpu_to_le16(ioreqs[i].value);
}
/* In USB 2.0 mode endpoint is interrupt type. However in USB 1.1 mode
* endpoint is bulk. Select correct type URB by endpoint descriptor.
*/
if (usb_endpoint_xfer_int(&ep->desc))
usb_fill_int_urb(urb, udev, usb_sndintpipe(udev, EP_REGS_OUT),
req, req_len, iowrite16v_urb_complete, usb,
ep->desc.bInterval);
else
usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
req, req_len, iowrite16v_urb_complete, usb);
urb->transfer_flags |= URB_FREE_BUFFER;
/* Submit previous URB */
r = zd_submit_waiting_urb(usb, false);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
"error in zd_submit_waiting_usb(). "
"Error number %d\n", r);
goto error;
}
/* Delay submit so that URB_NO_INTERRUPT flag can be set for all URBs
* of currect batch except for very last.
*/
usb->urb_async_waiting = urb;
return 0;
error:
usb_free_urb(urb);
return r;
}
int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
unsigned int count)
{
int r;
zd_usb_iowrite16v_async_start(usb);
r = zd_usb_iowrite16v_async(usb, ioreqs, count);
if (r) {
zd_usb_iowrite16v_async_end(usb, 0);
return r;
}
return zd_usb_iowrite16v_async_end(usb, 50 /* ms */);
}
int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
{
int r;
struct usb_device *udev;
struct usb_req_rfwrite *req = NULL;
int i, req_len, actual_req_len;
u16 bit_value_template;
if (in_atomic()) {
dev_dbg_f(zd_usb_dev(usb),
"error: io in atomic context not supported\n");
return -EWOULDBLOCK;
}
if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
dev_dbg_f(zd_usb_dev(usb),
"error: bits %d are smaller than"
" USB_MIN_RFWRITE_BIT_COUNT %d\n",
bits, USB_MIN_RFWRITE_BIT_COUNT);
return -EINVAL;
}
if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
dev_dbg_f(zd_usb_dev(usb),
"error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
bits, USB_MAX_RFWRITE_BIT_COUNT);
return -EINVAL;
}
#ifdef DEBUG
if (value & (~0UL << bits)) {
dev_dbg_f(zd_usb_dev(usb),
"error: value %#09x has bits >= %d set\n",
value, bits);
return -EINVAL;
}
#endif /* DEBUG */
dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
r = zd_usb_ioread16(usb, &bit_value_template, ZD_CR203);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
"error %d: Couldn't read ZD_CR203\n", r);
return r;
}
bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
BUILD_BUG_ON(sizeof(struct usb_req_rfwrite) +
USB_MAX_RFWRITE_BIT_COUNT * sizeof(__le16) >
sizeof(usb->req_buf));
BUG_ON(sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16) >
sizeof(usb->req_buf));
req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
req = (void *)usb->req_buf;
req->id = cpu_to_le16(USB_REQ_WRITE_RF);
/* 1: 3683a, but not used in ZYDAS driver */
req->value = cpu_to_le16(2);
req->bits = cpu_to_le16(bits);
for (i = 0; i < bits; i++) {
u16 bv = bit_value_template;
if (value & (1 << (bits-1-i)))
bv |= RF_DATA;
req->bit_values[i] = cpu_to_le16(bv);
}
udev = zd_usb_to_usbdev(usb);
r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
"error in zd_ep_regs_out_msg(). Error number %d\n", r);
goto out;
}
if (req_len != actual_req_len) {
dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()"
" req_len %d != actual_req_len %d\n",
req_len, actual_req_len);
r = -EIO;
goto out;
}
/* FALL-THROUGH with r == 0 */
out:
return r;
}
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