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linux/drivers/net/wireless/ath/carl9170/usb.c

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/*
* Atheros CARL9170 driver
*
* USB - frontend
*
* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
* Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
*
* 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; see the file COPYING. If not, see
* http://www.gnu.org/licenses/.
*
* This file incorporates work covered by the following copyright and
* permission notice:
* Copyright (c) 2007-2008 Atheros Communications, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/firmware.h>
#include <linux/etherdevice.h>
#include <linux/device.h>
#include <net/mac80211.h>
#include "carl9170.h"
#include "cmd.h"
#include "hw.h"
#include "fwcmd.h"
MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
MODULE_AUTHOR("Christian Lamparter <chunkeey@googlemail.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Atheros AR9170 802.11n USB wireless");
MODULE_FIRMWARE(CARL9170FW_NAME);
MODULE_ALIAS("ar9170usb");
MODULE_ALIAS("arusb_lnx");
/*
* Note:
*
* Always update our wiki's device list (located at:
* http://wireless.kernel.org/en/users/Drivers/ar9170/devices ),
* whenever you add a new device.
*/
static struct usb_device_id carl9170_usb_ids[] = {
/* Atheros 9170 */
{ USB_DEVICE(0x0cf3, 0x9170) },
/* Atheros TG121N */
{ USB_DEVICE(0x0cf3, 0x1001) },
/* TP-Link TL-WN821N v2 */
{ USB_DEVICE(0x0cf3, 0x1002), .driver_info = CARL9170_WPS_BUTTON |
CARL9170_ONE_LED },
/* 3Com Dual Band 802.11n USB Adapter */
{ USB_DEVICE(0x0cf3, 0x1010) },
/* H3C Dual Band 802.11n USB Adapter */
{ USB_DEVICE(0x0cf3, 0x1011) },
/* Cace Airpcap NX */
{ USB_DEVICE(0xcace, 0x0300) },
/* D-Link DWA 160 A1 */
{ USB_DEVICE(0x07d1, 0x3c10) },
/* D-Link DWA 160 A2 */
{ USB_DEVICE(0x07d1, 0x3a09) },
/* D-Link DWA 130 D */
{ USB_DEVICE(0x07d1, 0x3a0f) },
/* Netgear WNA1000 */
{ USB_DEVICE(0x0846, 0x9040) },
/* Netgear WNDA3100 (v1) */
{ USB_DEVICE(0x0846, 0x9010) },
/* Netgear WN111 v2 */
{ USB_DEVICE(0x0846, 0x9001), .driver_info = CARL9170_ONE_LED },
/* Zydas ZD1221 */
{ USB_DEVICE(0x0ace, 0x1221) },
/* Proxim ORiNOCO 802.11n USB */
{ USB_DEVICE(0x1435, 0x0804) },
/* WNC Generic 11n USB Dongle */
{ USB_DEVICE(0x1435, 0x0326) },
/* ZyXEL NWD271N */
{ USB_DEVICE(0x0586, 0x3417) },
/* Z-Com UB81 BG */
{ USB_DEVICE(0x0cde, 0x0023) },
/* Z-Com UB82 ABG */
{ USB_DEVICE(0x0cde, 0x0026) },
/* Sphairon Homelink 1202 */
{ USB_DEVICE(0x0cde, 0x0027) },
/* Arcadyan WN7512 */
{ USB_DEVICE(0x083a, 0xf522) },
/* Planex GWUS300 */
{ USB_DEVICE(0x2019, 0x5304) },
/* IO-Data WNGDNUS2 */
{ USB_DEVICE(0x04bb, 0x093f) },
/* NEC WL300NU-G */
{ USB_DEVICE(0x0409, 0x0249) },
/* NEC WL300NU-AG */
{ USB_DEVICE(0x0409, 0x02b4) },
/* AVM FRITZ!WLAN USB Stick N */
{ USB_DEVICE(0x057c, 0x8401) },
/* AVM FRITZ!WLAN USB Stick N 2.4 */
{ USB_DEVICE(0x057c, 0x8402) },
/* Qwest/Actiontec 802AIN Wireless N USB Network Adapter */
{ USB_DEVICE(0x1668, 0x1200) },
/* Airlive X.USB a/b/g/n */
{ USB_DEVICE(0x1b75, 0x9170) },
/* terminate */
{}
};
MODULE_DEVICE_TABLE(usb, carl9170_usb_ids);
static void carl9170_usb_submit_data_urb(struct ar9170 *ar)
{
struct urb *urb;
int err;
if (atomic_inc_return(&ar->tx_anch_urbs) > AR9170_NUM_TX_URBS)
goto err_acc;
urb = usb_get_from_anchor(&ar->tx_wait);
if (!urb)
goto err_acc;
usb_anchor_urb(urb, &ar->tx_anch);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(err)) {
if (net_ratelimit()) {
dev_err(&ar->udev->dev, "tx submit failed (%d)\n",
urb->status);
}
usb_unanchor_urb(urb);
usb_anchor_urb(urb, &ar->tx_err);
}
usb_free_urb(urb);
if (likely(err == 0))
return;
err_acc:
atomic_dec(&ar->tx_anch_urbs);
}
static void carl9170_usb_tx_data_complete(struct urb *urb)
{
struct ar9170 *ar = usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
if (WARN_ON_ONCE(!ar)) {
dev_kfree_skb_irq(urb->context);
return;
}
atomic_dec(&ar->tx_anch_urbs);
switch (urb->status) {
/* everything is fine */
case 0:
carl9170_tx_callback(ar, (void *)urb->context);
break;
/* disconnect */
case -ENOENT:
case -ECONNRESET:
case -ENODEV:
case -ESHUTDOWN:
/*
* Defer the frame clean-up to the tasklet worker.
* This is necessary, because carl9170_tx_drop
* does not work in an irqsave context.
*/
usb_anchor_urb(urb, &ar->tx_err);
return;
/* a random transmission error has occurred? */
default:
if (net_ratelimit()) {
dev_err(&ar->udev->dev, "tx failed (%d)\n",
urb->status);
}
usb_anchor_urb(urb, &ar->tx_err);
break;
}
if (likely(IS_STARTED(ar)))
carl9170_usb_submit_data_urb(ar);
}
static int carl9170_usb_submit_cmd_urb(struct ar9170 *ar)
{
struct urb *urb;
int err;
if (atomic_inc_return(&ar->tx_cmd_urbs) != 1) {
atomic_dec(&ar->tx_cmd_urbs);
return 0;
}
urb = usb_get_from_anchor(&ar->tx_cmd);
if (!urb) {
atomic_dec(&ar->tx_cmd_urbs);
return 0;
}
usb_anchor_urb(urb, &ar->tx_anch);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(err)) {
usb_unanchor_urb(urb);
atomic_dec(&ar->tx_cmd_urbs);
}
usb_free_urb(urb);
return err;
}
static void carl9170_usb_cmd_complete(struct urb *urb)
{
struct ar9170 *ar = urb->context;
int err = 0;
if (WARN_ON_ONCE(!ar))
return;
atomic_dec(&ar->tx_cmd_urbs);
switch (urb->status) {
/* everything is fine */
case 0:
break;
/* disconnect */
case -ENOENT:
case -ECONNRESET:
case -ENODEV:
case -ESHUTDOWN:
return;
default:
err = urb->status;
break;
}
if (!IS_INITIALIZED(ar))
return;
if (err)
dev_err(&ar->udev->dev, "submit cmd cb failed (%d).\n", err);
err = carl9170_usb_submit_cmd_urb(ar);
if (err)
dev_err(&ar->udev->dev, "submit cmd failed (%d).\n", err);
}
static void carl9170_usb_rx_irq_complete(struct urb *urb)
{
struct ar9170 *ar = urb->context;
if (WARN_ON_ONCE(!ar))
return;
switch (urb->status) {
/* everything is fine */
case 0:
break;
/* disconnect */
case -ENOENT:
case -ECONNRESET:
case -ENODEV:
case -ESHUTDOWN:
return;
default:
goto resubmit;
}
carl9170_handle_command_response(ar, urb->transfer_buffer,
urb->actual_length);
resubmit:
usb_anchor_urb(urb, &ar->rx_anch);
if (unlikely(usb_submit_urb(urb, GFP_ATOMIC)))
usb_unanchor_urb(urb);
}
static int carl9170_usb_submit_rx_urb(struct ar9170 *ar, gfp_t gfp)
{
struct urb *urb;
int err = 0, runs = 0;
while ((atomic_read(&ar->rx_anch_urbs) < AR9170_NUM_RX_URBS) &&
(runs++ < AR9170_NUM_RX_URBS)) {
err = -ENOSPC;
urb = usb_get_from_anchor(&ar->rx_pool);
if (urb) {
usb_anchor_urb(urb, &ar->rx_anch);
err = usb_submit_urb(urb, gfp);
if (unlikely(err)) {
usb_unanchor_urb(urb);
usb_anchor_urb(urb, &ar->rx_pool);
} else {
atomic_dec(&ar->rx_pool_urbs);
atomic_inc(&ar->rx_anch_urbs);
}
usb_free_urb(urb);
}
}
return err;
}
static void carl9170_usb_rx_work(struct ar9170 *ar)
{
struct urb *urb;
int i;
for (i = 0; i < AR9170_NUM_RX_URBS_POOL; i++) {
urb = usb_get_from_anchor(&ar->rx_work);
if (!urb)
break;
atomic_dec(&ar->rx_work_urbs);
if (IS_INITIALIZED(ar)) {
carl9170_rx(ar, urb->transfer_buffer,
urb->actual_length);
}
usb_anchor_urb(urb, &ar->rx_pool);
atomic_inc(&ar->rx_pool_urbs);
usb_free_urb(urb);
carl9170_usb_submit_rx_urb(ar, GFP_ATOMIC);
}
}
void carl9170_usb_handle_tx_err(struct ar9170 *ar)
{
struct urb *urb;
while ((urb = usb_get_from_anchor(&ar->tx_err))) {
struct sk_buff *skb = (void *)urb->context;
carl9170_tx_drop(ar, skb);
carl9170_tx_callback(ar, skb);
usb_free_urb(urb);
}
}
static void carl9170_usb_tasklet(unsigned long data)
{
struct ar9170 *ar = (struct ar9170 *) data;
if (!IS_INITIALIZED(ar))
return;
carl9170_usb_rx_work(ar);
/*
* Strictly speaking: The tx scheduler is not part of the USB system.
* But the rx worker returns frames back to the mac80211-stack and
* this is the _perfect_ place to generate the next transmissions.
*/
if (IS_STARTED(ar))
carl9170_tx_scheduler(ar);
}
static void carl9170_usb_rx_complete(struct urb *urb)
{
struct ar9170 *ar = (struct ar9170 *)urb->context;
int err;
if (WARN_ON_ONCE(!ar))
return;
atomic_dec(&ar->rx_anch_urbs);
switch (urb->status) {
case 0:
/* rx path */
usb_anchor_urb(urb, &ar->rx_work);
atomic_inc(&ar->rx_work_urbs);
break;
case -ENOENT:
case -ECONNRESET:
case -ENODEV:
case -ESHUTDOWN:
/* handle disconnect events*/
return;
default:
/* handle all other errors */
usb_anchor_urb(urb, &ar->rx_pool);
atomic_inc(&ar->rx_pool_urbs);
break;
}
err = carl9170_usb_submit_rx_urb(ar, GFP_ATOMIC);
if (unlikely(err)) {
/*
* usb_submit_rx_urb reported a problem.
* In case this is due to a rx buffer shortage,
* elevate the tasklet worker priority to
* the highest available level.
*/
tasklet_hi_schedule(&ar->usb_tasklet);
if (atomic_read(&ar->rx_anch_urbs) == 0) {
/*
* The system is too slow to cope with
* the enormous workload. We have simply
* run out of active rx urbs and this
* unfortunately leads to an unpredictable
* device.
*/
ieee80211_queue_work(ar->hw, &ar->ping_work);
}
} else {
/*
* Using anything less than _high_ priority absolutely
* kills the rx performance my UP-System...
*/
tasklet_hi_schedule(&ar->usb_tasklet);
}
}
static struct urb *carl9170_usb_alloc_rx_urb(struct ar9170 *ar, gfp_t gfp)
{
struct urb *urb;
void *buf;
buf = kmalloc(ar->fw.rx_size, gfp);
if (!buf)
return NULL;
urb = usb_alloc_urb(0, gfp);
if (!urb) {
kfree(buf);
return NULL;
}
usb_fill_bulk_urb(urb, ar->udev, usb_rcvbulkpipe(ar->udev,
AR9170_USB_EP_RX), buf, ar->fw.rx_size,
carl9170_usb_rx_complete, ar);
urb->transfer_flags |= URB_FREE_BUFFER;
return urb;
}
static int carl9170_usb_send_rx_irq_urb(struct ar9170 *ar)
{
struct urb *urb = NULL;
void *ibuf;
int err = -ENOMEM;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
goto out;
ibuf = kmalloc(AR9170_USB_EP_CTRL_MAX, GFP_KERNEL);
if (!ibuf)
goto out;
usb_fill_int_urb(urb, ar->udev, usb_rcvintpipe(ar->udev,
AR9170_USB_EP_IRQ), ibuf, AR9170_USB_EP_CTRL_MAX,
carl9170_usb_rx_irq_complete, ar, 1);
urb->transfer_flags |= URB_FREE_BUFFER;
usb_anchor_urb(urb, &ar->rx_anch);
err = usb_submit_urb(urb, GFP_KERNEL);
if (err)
usb_unanchor_urb(urb);
out:
usb_free_urb(urb);
return err;
}
static int carl9170_usb_init_rx_bulk_urbs(struct ar9170 *ar)
{
struct urb *urb;
int i, err = -EINVAL;
/*
* The driver actively maintains a second shadow
* pool for inactive, but fully-prepared rx urbs.
*
* The pool should help the driver to master huge
* workload spikes without running the risk of
* undersupplying the hardware or wasting time by
* processing rx data (streams) inside the urb
* completion (hardirq context).
*/
for (i = 0; i < AR9170_NUM_RX_URBS_POOL; i++) {
urb = carl9170_usb_alloc_rx_urb(ar, GFP_KERNEL);
if (!urb) {
err = -ENOMEM;
goto err_out;
}
usb_anchor_urb(urb, &ar->rx_pool);
atomic_inc(&ar->rx_pool_urbs);
usb_free_urb(urb);
}
err = carl9170_usb_submit_rx_urb(ar, GFP_KERNEL);
if (err)
goto err_out;
/* the device now waiting for the firmware. */
carl9170_set_state_when(ar, CARL9170_STOPPED, CARL9170_IDLE);
return 0;
err_out:
usb_scuttle_anchored_urbs(&ar->rx_pool);
usb_scuttle_anchored_urbs(&ar->rx_work);
usb_kill_anchored_urbs(&ar->rx_anch);
return err;
}
static int carl9170_usb_flush(struct ar9170 *ar)
{
struct urb *urb;
int ret, err = 0;
while ((urb = usb_get_from_anchor(&ar->tx_wait))) {
struct sk_buff *skb = (void *)urb->context;
carl9170_tx_drop(ar, skb);
carl9170_tx_callback(ar, skb);
usb_free_urb(urb);
}
ret = usb_wait_anchor_empty_timeout(&ar->tx_cmd, 1000);
if (ret == 0)
err = -ETIMEDOUT;
/* lets wait a while until the tx - queues are dried out */
ret = usb_wait_anchor_empty_timeout(&ar->tx_anch, 1000);
if (ret == 0)
err = -ETIMEDOUT;
usb_kill_anchored_urbs(&ar->tx_anch);
carl9170_usb_handle_tx_err(ar);
return err;
}
static void carl9170_usb_cancel_urbs(struct ar9170 *ar)
{
int err;
carl9170_set_state(ar, CARL9170_UNKNOWN_STATE);
err = carl9170_usb_flush(ar);
if (err)
dev_err(&ar->udev->dev, "stuck tx urbs!\n");
usb_poison_anchored_urbs(&ar->tx_anch);
carl9170_usb_handle_tx_err(ar);
usb_poison_anchored_urbs(&ar->rx_anch);
tasklet_kill(&ar->usb_tasklet);
usb_scuttle_anchored_urbs(&ar->rx_work);
usb_scuttle_anchored_urbs(&ar->rx_pool);
usb_scuttle_anchored_urbs(&ar->tx_cmd);
}
int __carl9170_exec_cmd(struct ar9170 *ar, struct carl9170_cmd *cmd,
const bool free_buf)
{
struct urb *urb;
int err = 0;
if (!IS_INITIALIZED(ar)) {
err = -EPERM;
goto err_free;
}
if (WARN_ON(cmd->hdr.len > CARL9170_MAX_CMD_LEN - 4)) {
err = -EINVAL;
goto err_free;
}
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
err = -ENOMEM;
goto err_free;
}
usb_fill_int_urb(urb, ar->udev, usb_sndintpipe(ar->udev,
AR9170_USB_EP_CMD), cmd, cmd->hdr.len + 4,
carl9170_usb_cmd_complete, ar, 1);
if (free_buf)
urb->transfer_flags |= URB_FREE_BUFFER;
usb_anchor_urb(urb, &ar->tx_cmd);
usb_free_urb(urb);
return carl9170_usb_submit_cmd_urb(ar);
err_free:
if (free_buf)
kfree(cmd);
return err;
}
int carl9170_exec_cmd(struct ar9170 *ar, const enum carl9170_cmd_oids cmd,
unsigned int plen, void *payload, unsigned int outlen, void *out)
{
int err = -ENOMEM;
if (!IS_ACCEPTING_CMD(ar))
return -EIO;
if (!(cmd & CARL9170_CMD_ASYNC_FLAG))
might_sleep();
ar->cmd.hdr.len = plen;
ar->cmd.hdr.cmd = cmd;
/* writing multiple regs fills this buffer already */
if (plen && payload != (u8 *)(ar->cmd.data))
memcpy(ar->cmd.data, payload, plen);
spin_lock_bh(&ar->cmd_lock);
ar->readbuf = (u8 *)out;
ar->readlen = outlen;
spin_unlock_bh(&ar->cmd_lock);
err = __carl9170_exec_cmd(ar, &ar->cmd, false);
if (!(cmd & CARL9170_CMD_ASYNC_FLAG)) {
err = wait_for_completion_timeout(&ar->cmd_wait, HZ);
if (err == 0) {
err = -ETIMEDOUT;
goto err_unbuf;
}
if (ar->readlen != outlen) {
err = -EMSGSIZE;
goto err_unbuf;
}
}
return 0;
err_unbuf:
/* Maybe the device was removed in the moment we were waiting? */
if (IS_STARTED(ar)) {
dev_err(&ar->udev->dev, "no command feedback "
"received (%d).\n", err);
/* provide some maybe useful debug information */
print_hex_dump_bytes("carl9170 cmd: ", DUMP_PREFIX_NONE,
&ar->cmd, plen + 4);
carl9170_restart(ar, CARL9170_RR_COMMAND_TIMEOUT);
}
/* invalidate to avoid completing the next command prematurely */
spin_lock_bh(&ar->cmd_lock);
ar->readbuf = NULL;
ar->readlen = 0;
spin_unlock_bh(&ar->cmd_lock);
return err;
}
void carl9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb)
{
struct urb *urb;
struct ar9170_stream *tx_stream;
void *data;
unsigned int len;
if (!IS_STARTED(ar))
goto err_drop;
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
goto err_drop;
if (ar->fw.tx_stream) {
tx_stream = (void *) (skb->data - sizeof(*tx_stream));
len = skb->len + sizeof(*tx_stream);
tx_stream->length = cpu_to_le16(len);
tx_stream->tag = cpu_to_le16(AR9170_TX_STREAM_TAG);
data = tx_stream;
} else {
data = skb->data;
len = skb->len;
}
usb_fill_bulk_urb(urb, ar->udev, usb_sndbulkpipe(ar->udev,
AR9170_USB_EP_TX), data, len,
carl9170_usb_tx_data_complete, skb);
urb->transfer_flags |= URB_ZERO_PACKET;
usb_anchor_urb(urb, &ar->tx_wait);
usb_free_urb(urb);
carl9170_usb_submit_data_urb(ar);
return;
err_drop:
carl9170_tx_drop(ar, skb);
carl9170_tx_callback(ar, skb);
}
static void carl9170_release_firmware(struct ar9170 *ar)
{
if (ar->fw.fw) {
release_firmware(ar->fw.fw);
memset(&ar->fw, 0, sizeof(ar->fw));
}
}
void carl9170_usb_stop(struct ar9170 *ar)
{
int ret;
carl9170_set_state_when(ar, CARL9170_IDLE, CARL9170_STOPPED);
ret = carl9170_usb_flush(ar);
if (ret)
dev_err(&ar->udev->dev, "kill pending tx urbs.\n");
usb_poison_anchored_urbs(&ar->tx_anch);
carl9170_usb_handle_tx_err(ar);
/* kill any pending command */
spin_lock_bh(&ar->cmd_lock);
ar->readlen = 0;
spin_unlock_bh(&ar->cmd_lock);
complete_all(&ar->cmd_wait);
/* This is required to prevent an early completion on _start */
INIT_COMPLETION(ar->cmd_wait);
/*
* Note:
* So far we freed all tx urbs, but we won't dare to touch any rx urbs.
* Else we would end up with a unresponsive device...
*/
}
int carl9170_usb_open(struct ar9170 *ar)
{
usb_unpoison_anchored_urbs(&ar->tx_anch);
carl9170_set_state_when(ar, CARL9170_STOPPED, CARL9170_IDLE);
return 0;
}
static int carl9170_usb_load_firmware(struct ar9170 *ar)
{
const u8 *data;
u8 *buf;
unsigned int transfer;
size_t len;
u32 addr;
int err = 0;
buf = kmalloc(4096, GFP_KERNEL);
if (!buf) {
err = -ENOMEM;
goto err_out;
}
data = ar->fw.fw->data;
len = ar->fw.fw->size;
addr = ar->fw.address;
/* this removes the miniboot image */
data += ar->fw.offset;
len -= ar->fw.offset;
while (len) {
transfer = min_t(unsigned int, len, 4096u);
memcpy(buf, data, transfer);
err = usb_control_msg(ar->udev, usb_sndctrlpipe(ar->udev, 0),
0x30 /* FW DL */, 0x40 | USB_DIR_OUT,
addr >> 8, 0, buf, transfer, 100);
if (err < 0) {
kfree(buf);
goto err_out;
}
len -= transfer;
data += transfer;
addr += transfer;
}
kfree(buf);
err = usb_control_msg(ar->udev, usb_sndctrlpipe(ar->udev, 0),
0x31 /* FW DL COMPLETE */,
0x40 | USB_DIR_OUT, 0, 0, NULL, 0, 200);
if (wait_for_completion_timeout(&ar->fw_boot_wait, HZ) == 0) {
err = -ETIMEDOUT;
goto err_out;
}
err = carl9170_echo_test(ar, 0x4a110123);
if (err)
goto err_out;
/* now, start the command response counter */
ar->cmd_seq = -1;
return 0;
err_out:
dev_err(&ar->udev->dev, "firmware upload failed (%d).\n", err);
return err;
}
int carl9170_usb_restart(struct ar9170 *ar)
{
int err = 0;
if (ar->intf->condition != USB_INTERFACE_BOUND)
return 0;
/*
* Disable the command response sequence counter check.
* We already know that the device/firmware is in a bad state.
* So, no extra points are awarded to anyone who reminds the
* driver about that.
*/
ar->cmd_seq = -2;
err = carl9170_reboot(ar);
carl9170_usb_stop(ar);
if (err)
goto err_out;
tasklet_schedule(&ar->usb_tasklet);
/* The reboot procedure can take quite a while to complete. */
msleep(1100);
err = carl9170_usb_open(ar);
if (err)
goto err_out;
err = carl9170_usb_load_firmware(ar);
if (err)
goto err_out;
return 0;
err_out:
carl9170_usb_cancel_urbs(ar);
return err;
}
void carl9170_usb_reset(struct ar9170 *ar)
{
/*
* This is the last resort to get the device going again
* without any *user replugging action*.
*
* But there is a catch: usb_reset really is like a physical
* *reconnect*. The mac80211 state will be lost in the process.
* Therefore a userspace application, which is monitoring
* the link must step in.
*/
carl9170_usb_cancel_urbs(ar);
carl9170_usb_stop(ar);
usb_queue_reset_device(ar->intf);
}
static int carl9170_usb_init_device(struct ar9170 *ar)
{
int err;
/*
* The carl9170 firmware let's the driver know when it's
* ready for action. But we have to be prepared to gracefully
* handle all spurious [flushed] messages after each (re-)boot.
* Thus the command response counter remains disabled until it
* can be safely synchronized.
*/
ar->cmd_seq = -2;
err = carl9170_usb_send_rx_irq_urb(ar);
if (err)
goto err_out;
err = carl9170_usb_init_rx_bulk_urbs(ar);
if (err)
goto err_unrx;
err = carl9170_usb_open(ar);
if (err)
goto err_unrx;
mutex_lock(&ar->mutex);
err = carl9170_usb_load_firmware(ar);
mutex_unlock(&ar->mutex);
if (err)
goto err_stop;
return 0;
err_stop:
carl9170_usb_stop(ar);
err_unrx:
carl9170_usb_cancel_urbs(ar);
err_out:
return err;
}
static void carl9170_usb_firmware_failed(struct ar9170 *ar)
{
struct device *parent = ar->udev->dev.parent;
struct usb_device *udev;
/*
* Store a copy of the usb_device pointer locally.
* This is because device_release_driver initiates
* carl9170_usb_disconnect, which in turn frees our
* driver context (ar).
*/
udev = ar->udev;
complete(&ar->fw_load_wait);
/* unbind anything failed */
if (parent)
device_lock(parent);
device_release_driver(&udev->dev);
if (parent)
device_unlock(parent);
usb_put_dev(udev);
}
static void carl9170_usb_firmware_finish(struct ar9170 *ar)
{
int err;
err = carl9170_parse_firmware(ar);
if (err)
goto err_freefw;
err = carl9170_usb_init_device(ar);
if (err)
goto err_freefw;
err = carl9170_register(ar);
carl9170_usb_stop(ar);
if (err)
goto err_unrx;
complete(&ar->fw_load_wait);
usb_put_dev(ar->udev);
return;
err_unrx:
carl9170_usb_cancel_urbs(ar);
err_freefw:
carl9170_release_firmware(ar);
carl9170_usb_firmware_failed(ar);
}
static void carl9170_usb_firmware_step2(const struct firmware *fw,
void *context)
{
struct ar9170 *ar = context;
if (fw) {
ar->fw.fw = fw;
carl9170_usb_firmware_finish(ar);
return;
}
dev_err(&ar->udev->dev, "firmware not found.\n");
carl9170_usb_firmware_failed(ar);
}
static int carl9170_usb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct ar9170 *ar;
struct usb_device *udev;
int err;
err = usb_reset_device(interface_to_usbdev(intf));
if (err)
return err;
ar = carl9170_alloc(sizeof(*ar));
if (IS_ERR(ar))
return PTR_ERR(ar);
udev = interface_to_usbdev(intf);
usb_get_dev(udev);
ar->udev = udev;
ar->intf = intf;
ar->features = id->driver_info;
usb_set_intfdata(intf, ar);
SET_IEEE80211_DEV(ar->hw, &intf->dev);
init_usb_anchor(&ar->rx_anch);
init_usb_anchor(&ar->rx_pool);
init_usb_anchor(&ar->rx_work);
init_usb_anchor(&ar->tx_wait);
init_usb_anchor(&ar->tx_anch);
init_usb_anchor(&ar->tx_cmd);
init_usb_anchor(&ar->tx_err);
init_completion(&ar->cmd_wait);
init_completion(&ar->fw_boot_wait);
init_completion(&ar->fw_load_wait);
tasklet_init(&ar->usb_tasklet, carl9170_usb_tasklet,
(unsigned long)ar);
atomic_set(&ar->tx_cmd_urbs, 0);
atomic_set(&ar->tx_anch_urbs, 0);
atomic_set(&ar->rx_work_urbs, 0);
atomic_set(&ar->rx_anch_urbs, 0);
atomic_set(&ar->rx_pool_urbs, 0);
usb_get_dev(ar->udev);
carl9170_set_state(ar, CARL9170_STOPPED);
return request_firmware_nowait(THIS_MODULE, 1, CARL9170FW_NAME,
&ar->udev->dev, GFP_KERNEL, ar, carl9170_usb_firmware_step2);
}
static void carl9170_usb_disconnect(struct usb_interface *intf)
{
struct ar9170 *ar = usb_get_intfdata(intf);
struct usb_device *udev;
if (WARN_ON(!ar))
return;
udev = ar->udev;
wait_for_completion(&ar->fw_load_wait);
if (IS_INITIALIZED(ar)) {
carl9170_reboot(ar);
carl9170_usb_stop(ar);
}
carl9170_usb_cancel_urbs(ar);
carl9170_unregister(ar);
usb_set_intfdata(intf, NULL);
carl9170_release_firmware(ar);
carl9170_free(ar);
usb_put_dev(udev);
}
#ifdef CONFIG_PM
static int carl9170_usb_suspend(struct usb_interface *intf,
pm_message_t message)
{
struct ar9170 *ar = usb_get_intfdata(intf);
if (!ar)
return -ENODEV;
carl9170_usb_cancel_urbs(ar);
return 0;
}
static int carl9170_usb_resume(struct usb_interface *intf)
{
struct ar9170 *ar = usb_get_intfdata(intf);
int err;
if (!ar)
return -ENODEV;
usb_unpoison_anchored_urbs(&ar->rx_anch);
carl9170_set_state(ar, CARL9170_STOPPED);
/*
* The USB documentation demands that [for suspend] all traffic
* to and from the device has to stop. This would be fine, but
* there's a catch: the device[usb phy] does not come back.
*
* Upon resume the firmware will "kill" itself and the
* boot-code sorts out the magic voodoo.
* Not very nice, but there's not much what could go wrong.
*/
msleep(1100);
err = carl9170_usb_init_device(ar);
if (err)
goto err_unrx;
return 0;
err_unrx:
carl9170_usb_cancel_urbs(ar);
return err;
}
#endif /* CONFIG_PM */
static struct usb_driver carl9170_driver = {
.name = KBUILD_MODNAME,
.probe = carl9170_usb_probe,
.disconnect = carl9170_usb_disconnect,
.id_table = carl9170_usb_ids,
.soft_unbind = 1,
#ifdef CONFIG_PM
.suspend = carl9170_usb_suspend,
.resume = carl9170_usb_resume,
.reset_resume = carl9170_usb_resume,
#endif /* CONFIG_PM */
};
static int __init carl9170_usb_init(void)
{
return usb_register(&carl9170_driver);
}
static void __exit carl9170_usb_exit(void)
{
usb_deregister(&carl9170_driver);
}
module_init(carl9170_usb_init);
module_exit(carl9170_usb_exit);
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