/* * Atheros CARL9170 driver * * USB - frontend * * Copyright 2008, Johannes Berg * Copyright 2009, 2010, Christian Lamparter * * 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 #include #include #include #include #include #include #include "carl9170.h" #include "cmd.h" #include "hw.h" #include "fwcmd.h" MODULE_AUTHOR("Johannes Berg "); MODULE_AUTHOR("Christian Lamparter "); 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 */ 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 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); 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 */ .disable_hub_initiated_lpm = 1, }; module_usb_driver(carl9170_driver);