--- /dev/null
+/*
+ * 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;
+ }
+
+ /*
+ * While the carl9170 firmware does not use this EP, the
+ * firmware loader in the EEPROM unfortunately does.
+ * Therefore we need to be ready to handle out-of-band
+ * responses and traps in case the firmware crashed and
+ * the loader took over again.
+ */
+ 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;
+ }
+
+ if (ar->usb_ep_cmd_is_bulk)
+ usb_fill_bulk_urb(urb, ar->udev,
+ usb_sndbulkpipe(ar->udev, AR9170_USB_EP_CMD),
+ cmd, cmd->hdr.len + 4,
+ carl9170_usb_cmd_complete, ar);
+ else
+ 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 */
+ reinit_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 usb_endpoint_descriptor *ep;
+ struct ar9170 *ar;
+ struct usb_device *udev;
+ int i, 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;
+
+ /* We need to remember the type of endpoint 4 because it differs
+ * between high- and full-speed configuration. The high-speed
+ * configuration specifies it as interrupt and the full-speed
+ * configuration as bulk endpoint. This information is required
+ * later when sending urbs to that endpoint.
+ */
+ for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; ++i) {
+ ep = &intf->cur_altsetting->endpoint[i].desc;
+
+ if (usb_endpoint_num(ep) == AR9170_USB_EP_CMD &&
+ usb_endpoint_dir_out(ep) &&
+ usb_endpoint_type(ep) == USB_ENDPOINT_XFER_BULK)
+ ar->usb_ep_cmd_is_bulk = true;
+ }
+
+ 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);
+
+ err = request_firmware_nowait(THIS_MODULE, 1, CARL9170FW_NAME,
+ &ar->udev->dev, GFP_KERNEL, ar, carl9170_usb_firmware_step2);
+ if (err) {
+ usb_put_dev(udev);
+ usb_put_dev(udev);
+ carl9170_free(ar);
+ }
+ return err;
+}
+
+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 */
+ .disable_hub_initiated_lpm = 1,
+};
+
+module_usb_driver(carl9170_driver);
Code Review / kvmfornfv.git / blobdiff