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0001 /*
0002  * Copyright (c) 2010-2011 Atheros Communications Inc.
0003  *
0004  * Permission to use, copy, modify, and/or distribute this software for any
0005  * purpose with or without fee is hereby granted, provided that the above
0006  * copyright notice and this permission notice appear in all copies.
0007  *
0008  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
0009  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
0010  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
0011  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
0012  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
0013  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
0014  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
0015  */
0016 
0017 #include <asm/unaligned.h>
0018 #include "htc.h"
0019 
0020 MODULE_FIRMWARE(HTC_7010_MODULE_FW);
0021 MODULE_FIRMWARE(HTC_9271_MODULE_FW);
0022 
0023 static const struct usb_device_id ath9k_hif_usb_ids[] = {
0024     { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
0025     { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
0026     { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
0027     { USB_DEVICE(0x07b8, 0x9271) }, /* Altai WA1011N-GU */
0028     { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
0029     { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
0030     { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
0031     { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
0032     { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
0033     { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
0034     { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
0035     { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
0036     { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
0037     { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
0038     { USB_DEVICE(0x0cf3, 0xb002) }, /* Ubiquiti WifiStation */
0039     { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
0040     { USB_DEVICE(0x0471, 0x209e) }, /* Philips (or NXP) PTA01 */
0041     { USB_DEVICE(0x1eda, 0x2315) }, /* AirTies */
0042 
0043     { USB_DEVICE(0x0cf3, 0x7015),
0044       .driver_info = AR9287_USB },  /* Atheros */
0045     { USB_DEVICE(0x1668, 0x1200),
0046       .driver_info = AR9287_USB },  /* Verizon */
0047 
0048     { USB_DEVICE(0x0cf3, 0x7010),
0049       .driver_info = AR9280_USB },  /* Atheros */
0050     { USB_DEVICE(0x0846, 0x9018),
0051       .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
0052     { USB_DEVICE(0x083A, 0xA704),
0053       .driver_info = AR9280_USB },  /* SMC Networks */
0054     { USB_DEVICE(0x0411, 0x017f),
0055       .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
0056     { USB_DEVICE(0x0411, 0x0197),
0057       .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
0058     { USB_DEVICE(0x04da, 0x3904),
0059       .driver_info = AR9280_USB },
0060     { USB_DEVICE(0x0930, 0x0a08),
0061       .driver_info = AR9280_USB },  /* Toshiba WLM-20U2 and GN-1080 */
0062 
0063     { USB_DEVICE(0x0cf3, 0x20ff),
0064       .driver_info = STORAGE_DEVICE },
0065 
0066     { },
0067 };
0068 
0069 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
0070 
0071 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
0072 
0073 static void hif_usb_regout_cb(struct urb *urb)
0074 {
0075     struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
0076 
0077     switch (urb->status) {
0078     case 0:
0079         break;
0080     case -ENOENT:
0081     case -ECONNRESET:
0082     case -ENODEV:
0083     case -ESHUTDOWN:
0084         goto free;
0085     default:
0086         break;
0087     }
0088 
0089     if (cmd) {
0090         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
0091                       cmd->skb, true);
0092         kfree(cmd);
0093     }
0094 
0095     return;
0096 free:
0097     kfree_skb(cmd->skb);
0098     kfree(cmd);
0099 }
0100 
0101 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
0102                    struct sk_buff *skb)
0103 {
0104     struct urb *urb;
0105     struct cmd_buf *cmd;
0106     int ret = 0;
0107 
0108     urb = usb_alloc_urb(0, GFP_KERNEL);
0109     if (urb == NULL)
0110         return -ENOMEM;
0111 
0112     cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
0113     if (cmd == NULL) {
0114         usb_free_urb(urb);
0115         return -ENOMEM;
0116     }
0117 
0118     cmd->skb = skb;
0119     cmd->hif_dev = hif_dev;
0120 
0121     usb_fill_int_urb(urb, hif_dev->udev,
0122              usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
0123              skb->data, skb->len,
0124              hif_usb_regout_cb, cmd, 1);
0125 
0126     usb_anchor_urb(urb, &hif_dev->regout_submitted);
0127     ret = usb_submit_urb(urb, GFP_KERNEL);
0128     if (ret) {
0129         usb_unanchor_urb(urb);
0130         kfree(cmd);
0131     }
0132     usb_free_urb(urb);
0133 
0134     return ret;
0135 }
0136 
0137 static void hif_usb_mgmt_cb(struct urb *urb)
0138 {
0139     struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
0140     struct hif_device_usb *hif_dev;
0141     unsigned long flags;
0142     bool txok = true;
0143 
0144     if (!cmd || !cmd->skb || !cmd->hif_dev)
0145         return;
0146 
0147     hif_dev = cmd->hif_dev;
0148 
0149     switch (urb->status) {
0150     case 0:
0151         break;
0152     case -ENOENT:
0153     case -ECONNRESET:
0154     case -ENODEV:
0155     case -ESHUTDOWN:
0156         txok = false;
0157 
0158         /*
0159          * If the URBs are being flushed, no need to complete
0160          * this packet.
0161          */
0162         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0163         if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
0164             spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0165             dev_kfree_skb_any(cmd->skb);
0166             kfree(cmd);
0167             return;
0168         }
0169         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0170 
0171         break;
0172     default:
0173         txok = false;
0174         break;
0175     }
0176 
0177     skb_pull(cmd->skb, 4);
0178     ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
0179                   cmd->skb, txok);
0180     kfree(cmd);
0181 }
0182 
0183 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
0184                  struct sk_buff *skb)
0185 {
0186     struct urb *urb;
0187     struct cmd_buf *cmd;
0188     int ret = 0;
0189     __le16 *hdr;
0190 
0191     urb = usb_alloc_urb(0, GFP_ATOMIC);
0192     if (urb == NULL)
0193         return -ENOMEM;
0194 
0195     cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
0196     if (cmd == NULL) {
0197         usb_free_urb(urb);
0198         return -ENOMEM;
0199     }
0200 
0201     cmd->skb = skb;
0202     cmd->hif_dev = hif_dev;
0203 
0204     hdr = skb_push(skb, 4);
0205     *hdr++ = cpu_to_le16(skb->len - 4);
0206     *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
0207 
0208     usb_fill_bulk_urb(urb, hif_dev->udev,
0209              usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
0210              skb->data, skb->len,
0211              hif_usb_mgmt_cb, cmd);
0212 
0213     usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
0214     ret = usb_submit_urb(urb, GFP_ATOMIC);
0215     if (ret) {
0216         usb_unanchor_urb(urb);
0217         kfree(cmd);
0218     }
0219     usb_free_urb(urb);
0220 
0221     return ret;
0222 }
0223 
0224 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
0225                      struct sk_buff_head *list)
0226 {
0227     struct sk_buff *skb;
0228 
0229     while ((skb = __skb_dequeue(list)) != NULL) {
0230         dev_kfree_skb_any(skb);
0231     }
0232 }
0233 
0234 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
0235                         struct sk_buff_head *queue,
0236                         bool txok)
0237 {
0238     struct sk_buff *skb;
0239 
0240     while ((skb = __skb_dequeue(queue)) != NULL) {
0241 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
0242         int ln = skb->len;
0243 #endif
0244         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
0245                       skb, txok);
0246         if (txok) {
0247             TX_STAT_INC(hif_dev, skb_success);
0248             TX_STAT_ADD(hif_dev, skb_success_bytes, ln);
0249         }
0250         else
0251             TX_STAT_INC(hif_dev, skb_failed);
0252     }
0253 }
0254 
0255 static void hif_usb_tx_cb(struct urb *urb)
0256 {
0257     struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
0258     struct hif_device_usb *hif_dev;
0259     bool txok = true;
0260 
0261     if (!tx_buf || !tx_buf->hif_dev)
0262         return;
0263 
0264     hif_dev = tx_buf->hif_dev;
0265 
0266     switch (urb->status) {
0267     case 0:
0268         break;
0269     case -ENOENT:
0270     case -ECONNRESET:
0271     case -ENODEV:
0272     case -ESHUTDOWN:
0273         txok = false;
0274 
0275         /*
0276          * If the URBs are being flushed, no need to add this
0277          * URB to the free list.
0278          */
0279         spin_lock(&hif_dev->tx.tx_lock);
0280         if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
0281             spin_unlock(&hif_dev->tx.tx_lock);
0282             ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
0283             return;
0284         }
0285         spin_unlock(&hif_dev->tx.tx_lock);
0286 
0287         break;
0288     default:
0289         txok = false;
0290         break;
0291     }
0292 
0293     ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
0294 
0295     /* Re-initialize the SKB queue */
0296     tx_buf->len = tx_buf->offset = 0;
0297     __skb_queue_head_init(&tx_buf->skb_queue);
0298 
0299     /* Add this TX buffer to the free list */
0300     spin_lock(&hif_dev->tx.tx_lock);
0301     list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
0302     hif_dev->tx.tx_buf_cnt++;
0303     if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
0304         __hif_usb_tx(hif_dev); /* Check for pending SKBs */
0305     TX_STAT_INC(hif_dev, buf_completed);
0306     spin_unlock(&hif_dev->tx.tx_lock);
0307 }
0308 
0309 /* TX lock has to be taken */
0310 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
0311 {
0312     struct tx_buf *tx_buf = NULL;
0313     struct sk_buff *nskb = NULL;
0314     int ret = 0, i;
0315     u16 tx_skb_cnt = 0;
0316     u8 *buf;
0317     __le16 *hdr;
0318 
0319     if (hif_dev->tx.tx_skb_cnt == 0)
0320         return 0;
0321 
0322     /* Check if a free TX buffer is available */
0323     if (list_empty(&hif_dev->tx.tx_buf))
0324         return 0;
0325 
0326     tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
0327     list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
0328     hif_dev->tx.tx_buf_cnt--;
0329 
0330     tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
0331 
0332     for (i = 0; i < tx_skb_cnt; i++) {
0333         nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
0334 
0335         /* Should never be NULL */
0336         BUG_ON(!nskb);
0337 
0338         hif_dev->tx.tx_skb_cnt--;
0339 
0340         buf = tx_buf->buf;
0341         buf += tx_buf->offset;
0342         hdr = (__le16 *)buf;
0343         *hdr++ = cpu_to_le16(nskb->len);
0344         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
0345         buf += 4;
0346         memcpy(buf, nskb->data, nskb->len);
0347         tx_buf->len = nskb->len + 4;
0348 
0349         if (i < (tx_skb_cnt - 1))
0350             tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
0351 
0352         if (i == (tx_skb_cnt - 1))
0353             tx_buf->len += tx_buf->offset;
0354 
0355         __skb_queue_tail(&tx_buf->skb_queue, nskb);
0356         TX_STAT_INC(hif_dev, skb_queued);
0357     }
0358 
0359     usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
0360               usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
0361               tx_buf->buf, tx_buf->len,
0362               hif_usb_tx_cb, tx_buf);
0363 
0364     ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
0365     if (ret) {
0366         tx_buf->len = tx_buf->offset = 0;
0367         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
0368         __skb_queue_head_init(&tx_buf->skb_queue);
0369         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
0370         hif_dev->tx.tx_buf_cnt++;
0371     } else {
0372         TX_STAT_INC(hif_dev, buf_queued);
0373     }
0374 
0375     return ret;
0376 }
0377 
0378 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
0379 {
0380     struct ath9k_htc_tx_ctl *tx_ctl;
0381     unsigned long flags;
0382     int ret = 0;
0383 
0384     spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0385 
0386     if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
0387         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0388         return -ENODEV;
0389     }
0390 
0391     /* Check if the max queue count has been reached */
0392     if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
0393         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0394         return -ENOMEM;
0395     }
0396 
0397     spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0398 
0399     tx_ctl = HTC_SKB_CB(skb);
0400 
0401     /* Mgmt/Beacon frames don't use the TX buffer pool */
0402     if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
0403         (tx_ctl->type == ATH9K_HTC_BEACON)) {
0404         ret = hif_usb_send_mgmt(hif_dev, skb);
0405     }
0406 
0407     spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0408 
0409     if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
0410         (tx_ctl->type == ATH9K_HTC_AMPDU)) {
0411         __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
0412         hif_dev->tx.tx_skb_cnt++;
0413     }
0414 
0415     /* Check if AMPDUs have to be sent immediately */
0416     if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
0417         (hif_dev->tx.tx_skb_cnt < 2)) {
0418         __hif_usb_tx(hif_dev);
0419     }
0420 
0421     spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0422 
0423     return ret;
0424 }
0425 
0426 static void hif_usb_start(void *hif_handle)
0427 {
0428     struct hif_device_usb *hif_dev = hif_handle;
0429     unsigned long flags;
0430 
0431     hif_dev->flags |= HIF_USB_START;
0432 
0433     spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0434     hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
0435     spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0436 }
0437 
0438 static void hif_usb_stop(void *hif_handle)
0439 {
0440     struct hif_device_usb *hif_dev = hif_handle;
0441     struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
0442     unsigned long flags;
0443 
0444     spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0445     ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
0446     hif_dev->tx.tx_skb_cnt = 0;
0447     hif_dev->tx.flags |= HIF_USB_TX_STOP;
0448     spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0449 
0450     /* The pending URBs have to be canceled. */
0451     spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0452     list_for_each_entry_safe(tx_buf, tx_buf_tmp,
0453                  &hif_dev->tx.tx_pending, list) {
0454         usb_get_urb(tx_buf->urb);
0455         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0456         usb_kill_urb(tx_buf->urb);
0457         list_del(&tx_buf->list);
0458         usb_free_urb(tx_buf->urb);
0459         kfree(tx_buf->buf);
0460         kfree(tx_buf);
0461         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0462     }
0463     spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0464 
0465     usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
0466 }
0467 
0468 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
0469 {
0470     struct hif_device_usb *hif_dev = hif_handle;
0471     int ret = 0;
0472 
0473     switch (pipe_id) {
0474     case USB_WLAN_TX_PIPE:
0475         ret = hif_usb_send_tx(hif_dev, skb);
0476         break;
0477     case USB_REG_OUT_PIPE:
0478         ret = hif_usb_send_regout(hif_dev, skb);
0479         break;
0480     default:
0481         dev_err(&hif_dev->udev->dev,
0482             "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
0483         ret = -EINVAL;
0484         break;
0485     }
0486 
0487     return ret;
0488 }
0489 
0490 static inline bool check_index(struct sk_buff *skb, u8 idx)
0491 {
0492     struct ath9k_htc_tx_ctl *tx_ctl;
0493 
0494     tx_ctl = HTC_SKB_CB(skb);
0495 
0496     if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
0497         (tx_ctl->sta_idx == idx))
0498         return true;
0499 
0500     return false;
0501 }
0502 
0503 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
0504 {
0505     struct hif_device_usb *hif_dev = hif_handle;
0506     struct sk_buff *skb, *tmp;
0507     unsigned long flags;
0508 
0509     spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0510 
0511     skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
0512         if (check_index(skb, idx)) {
0513             __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
0514             ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
0515                           skb, false);
0516             hif_dev->tx.tx_skb_cnt--;
0517             TX_STAT_INC(hif_dev, skb_failed);
0518         }
0519     }
0520 
0521     spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0522 }
0523 
0524 static struct ath9k_htc_hif hif_usb = {
0525     .transport = ATH9K_HIF_USB,
0526     .name = "ath9k_hif_usb",
0527 
0528     .control_ul_pipe = USB_REG_OUT_PIPE,
0529     .control_dl_pipe = USB_REG_IN_PIPE,
0530 
0531     .start = hif_usb_start,
0532     .stop = hif_usb_stop,
0533     .sta_drain = hif_usb_sta_drain,
0534     .send = hif_usb_send,
0535 };
0536 
0537 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
0538                     struct sk_buff *skb)
0539 {
0540     struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
0541     int index = 0, i, len = skb->len;
0542     int rx_remain_len, rx_pkt_len;
0543     u16 pool_index = 0;
0544     u8 *ptr;
0545 
0546     spin_lock(&hif_dev->rx_lock);
0547 
0548     rx_remain_len = hif_dev->rx_remain_len;
0549     rx_pkt_len = hif_dev->rx_transfer_len;
0550 
0551     if (rx_remain_len != 0) {
0552         struct sk_buff *remain_skb = hif_dev->remain_skb;
0553 
0554         if (remain_skb) {
0555             ptr = (u8 *) remain_skb->data;
0556 
0557             index = rx_remain_len;
0558             rx_remain_len -= hif_dev->rx_pad_len;
0559             ptr += rx_pkt_len;
0560 
0561             memcpy(ptr, skb->data, rx_remain_len);
0562 
0563             rx_pkt_len += rx_remain_len;
0564             hif_dev->rx_remain_len = 0;
0565             skb_put(remain_skb, rx_pkt_len);
0566 
0567             skb_pool[pool_index++] = remain_skb;
0568 
0569         } else {
0570             index = rx_remain_len;
0571         }
0572     }
0573 
0574     spin_unlock(&hif_dev->rx_lock);
0575 
0576     while (index < len) {
0577         u16 pkt_len;
0578         u16 pkt_tag;
0579         u16 pad_len;
0580         int chk_idx;
0581 
0582         ptr = (u8 *) skb->data;
0583 
0584         pkt_len = get_unaligned_le16(ptr + index);
0585         pkt_tag = get_unaligned_le16(ptr + index + 2);
0586 
0587         if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
0588             RX_STAT_INC(hif_dev, skb_dropped);
0589             return;
0590         }
0591 
0592         if (pkt_len > 2 * MAX_RX_BUF_SIZE) {
0593             dev_err(&hif_dev->udev->dev,
0594                 "ath9k_htc: invalid pkt_len (%x)\n", pkt_len);
0595             RX_STAT_INC(hif_dev, skb_dropped);
0596             return;
0597         }
0598 
0599         pad_len = 4 - (pkt_len & 0x3);
0600         if (pad_len == 4)
0601             pad_len = 0;
0602 
0603         chk_idx = index;
0604         index = index + 4 + pkt_len + pad_len;
0605 
0606         if (index > MAX_RX_BUF_SIZE) {
0607             spin_lock(&hif_dev->rx_lock);
0608             hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
0609             hif_dev->rx_transfer_len =
0610                 MAX_RX_BUF_SIZE - chk_idx - 4;
0611             hif_dev->rx_pad_len = pad_len;
0612 
0613             nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
0614             if (!nskb) {
0615                 dev_err(&hif_dev->udev->dev,
0616                     "ath9k_htc: RX memory allocation error\n");
0617                 spin_unlock(&hif_dev->rx_lock);
0618                 goto err;
0619             }
0620             skb_reserve(nskb, 32);
0621             RX_STAT_INC(hif_dev, skb_allocated);
0622 
0623             memcpy(nskb->data, &(skb->data[chk_idx+4]),
0624                    hif_dev->rx_transfer_len);
0625 
0626             /* Record the buffer pointer */
0627             hif_dev->remain_skb = nskb;
0628             spin_unlock(&hif_dev->rx_lock);
0629         } else {
0630             if (pool_index == MAX_PKT_NUM_IN_TRANSFER) {
0631                 dev_err(&hif_dev->udev->dev,
0632                     "ath9k_htc: over RX MAX_PKT_NUM\n");
0633                 goto err;
0634             }
0635             nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
0636             if (!nskb) {
0637                 dev_err(&hif_dev->udev->dev,
0638                     "ath9k_htc: RX memory allocation error\n");
0639                 goto err;
0640             }
0641             skb_reserve(nskb, 32);
0642             RX_STAT_INC(hif_dev, skb_allocated);
0643 
0644             memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
0645             skb_put(nskb, pkt_len);
0646             skb_pool[pool_index++] = nskb;
0647         }
0648     }
0649 
0650 err:
0651     for (i = 0; i < pool_index; i++) {
0652         RX_STAT_ADD(hif_dev, skb_completed_bytes, skb_pool[i]->len);
0653         ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
0654                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
0655         RX_STAT_INC(hif_dev, skb_completed);
0656     }
0657 }
0658 
0659 static void ath9k_hif_usb_rx_cb(struct urb *urb)
0660 {
0661     struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
0662     struct hif_device_usb *hif_dev = rx_buf->hif_dev;
0663     struct sk_buff *skb = rx_buf->skb;
0664     int ret;
0665 
0666     if (!skb)
0667         return;
0668 
0669     if (!hif_dev)
0670         goto free;
0671 
0672     switch (urb->status) {
0673     case 0:
0674         break;
0675     case -ENOENT:
0676     case -ECONNRESET:
0677     case -ENODEV:
0678     case -ESHUTDOWN:
0679         goto free;
0680     default:
0681         goto resubmit;
0682     }
0683 
0684     if (likely(urb->actual_length != 0)) {
0685         skb_put(skb, urb->actual_length);
0686         ath9k_hif_usb_rx_stream(hif_dev, skb);
0687     }
0688 
0689 resubmit:
0690     skb_reset_tail_pointer(skb);
0691     skb_trim(skb, 0);
0692 
0693     usb_anchor_urb(urb, &hif_dev->rx_submitted);
0694     ret = usb_submit_urb(urb, GFP_ATOMIC);
0695     if (ret) {
0696         usb_unanchor_urb(urb);
0697         goto free;
0698     }
0699 
0700     return;
0701 free:
0702     kfree_skb(skb);
0703     kfree(rx_buf);
0704 }
0705 
0706 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
0707 {
0708     struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
0709     struct hif_device_usb *hif_dev = rx_buf->hif_dev;
0710     struct sk_buff *skb = rx_buf->skb;
0711     struct sk_buff *nskb;
0712     int ret;
0713 
0714     if (!skb)
0715         return;
0716 
0717     if (!hif_dev)
0718         goto free;
0719 
0720     switch (urb->status) {
0721     case 0:
0722         break;
0723     case -ENOENT:
0724     case -ECONNRESET:
0725     case -ENODEV:
0726     case -ESHUTDOWN:
0727         goto free;
0728     default:
0729         skb_reset_tail_pointer(skb);
0730         skb_trim(skb, 0);
0731 
0732         goto resubmit;
0733     }
0734 
0735     if (likely(urb->actual_length != 0)) {
0736         skb_put(skb, urb->actual_length);
0737 
0738         /* Process the command first */
0739         ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
0740                  skb->len, USB_REG_IN_PIPE);
0741 
0742 
0743         nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
0744         if (!nskb) {
0745             dev_err(&hif_dev->udev->dev,
0746                 "ath9k_htc: REG_IN memory allocation failure\n");
0747             urb->context = NULL;
0748             return;
0749         }
0750 
0751         rx_buf->skb = nskb;
0752 
0753         usb_fill_int_urb(urb, hif_dev->udev,
0754                  usb_rcvintpipe(hif_dev->udev,
0755                          USB_REG_IN_PIPE),
0756                  nskb->data, MAX_REG_IN_BUF_SIZE,
0757                  ath9k_hif_usb_reg_in_cb, rx_buf, 1);
0758     }
0759 
0760 resubmit:
0761     usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
0762     ret = usb_submit_urb(urb, GFP_ATOMIC);
0763     if (ret) {
0764         usb_unanchor_urb(urb);
0765         goto free;
0766     }
0767 
0768     return;
0769 free:
0770     kfree_skb(skb);
0771     kfree(rx_buf);
0772     urb->context = NULL;
0773 }
0774 
0775 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
0776 {
0777     struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
0778     unsigned long flags;
0779 
0780     spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0781     list_for_each_entry_safe(tx_buf, tx_buf_tmp,
0782                  &hif_dev->tx.tx_buf, list) {
0783         usb_get_urb(tx_buf->urb);
0784         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0785         usb_kill_urb(tx_buf->urb);
0786         list_del(&tx_buf->list);
0787         usb_free_urb(tx_buf->urb);
0788         kfree(tx_buf->buf);
0789         kfree(tx_buf);
0790         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0791     }
0792     spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0793 
0794     spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0795     hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
0796     spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0797 
0798     spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0799     list_for_each_entry_safe(tx_buf, tx_buf_tmp,
0800                  &hif_dev->tx.tx_pending, list) {
0801         usb_get_urb(tx_buf->urb);
0802         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0803         usb_kill_urb(tx_buf->urb);
0804         list_del(&tx_buf->list);
0805         usb_free_urb(tx_buf->urb);
0806         kfree(tx_buf->buf);
0807         kfree(tx_buf);
0808         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
0809     }
0810     spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
0811 
0812     usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
0813 }
0814 
0815 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
0816 {
0817     struct tx_buf *tx_buf;
0818     int i;
0819 
0820     INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
0821     INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
0822     spin_lock_init(&hif_dev->tx.tx_lock);
0823     __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
0824     init_usb_anchor(&hif_dev->mgmt_submitted);
0825 
0826     for (i = 0; i < MAX_TX_URB_NUM; i++) {
0827         tx_buf = kzalloc(sizeof(*tx_buf), GFP_KERNEL);
0828         if (!tx_buf)
0829             goto err;
0830 
0831         tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
0832         if (!tx_buf->buf)
0833             goto err;
0834 
0835         tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
0836         if (!tx_buf->urb)
0837             goto err;
0838 
0839         tx_buf->hif_dev = hif_dev;
0840         __skb_queue_head_init(&tx_buf->skb_queue);
0841 
0842         list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
0843     }
0844 
0845     hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
0846 
0847     return 0;
0848 err:
0849     if (tx_buf) {
0850         kfree(tx_buf->buf);
0851         kfree(tx_buf);
0852     }
0853     ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
0854     return -ENOMEM;
0855 }
0856 
0857 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
0858 {
0859     usb_kill_anchored_urbs(&hif_dev->rx_submitted);
0860 }
0861 
0862 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
0863 {
0864     struct rx_buf *rx_buf = NULL;
0865     struct sk_buff *skb = NULL;
0866     struct urb *urb = NULL;
0867     int i, ret;
0868 
0869     init_usb_anchor(&hif_dev->rx_submitted);
0870     spin_lock_init(&hif_dev->rx_lock);
0871 
0872     for (i = 0; i < MAX_RX_URB_NUM; i++) {
0873 
0874         rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
0875         if (!rx_buf) {
0876             ret = -ENOMEM;
0877             goto err_rxb;
0878         }
0879 
0880         /* Allocate URB */
0881         urb = usb_alloc_urb(0, GFP_KERNEL);
0882         if (urb == NULL) {
0883             ret = -ENOMEM;
0884             goto err_urb;
0885         }
0886 
0887         /* Allocate buffer */
0888         skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
0889         if (!skb) {
0890             ret = -ENOMEM;
0891             goto err_skb;
0892         }
0893 
0894         rx_buf->hif_dev = hif_dev;
0895         rx_buf->skb = skb;
0896 
0897         usb_fill_bulk_urb(urb, hif_dev->udev,
0898                   usb_rcvbulkpipe(hif_dev->udev,
0899                           USB_WLAN_RX_PIPE),
0900                   skb->data, MAX_RX_BUF_SIZE,
0901                   ath9k_hif_usb_rx_cb, rx_buf);
0902 
0903         /* Anchor URB */
0904         usb_anchor_urb(urb, &hif_dev->rx_submitted);
0905 
0906         /* Submit URB */
0907         ret = usb_submit_urb(urb, GFP_KERNEL);
0908         if (ret) {
0909             usb_unanchor_urb(urb);
0910             goto err_submit;
0911         }
0912 
0913         /*
0914          * Drop reference count.
0915          * This ensures that the URB is freed when killing them.
0916          */
0917         usb_free_urb(urb);
0918     }
0919 
0920     return 0;
0921 
0922 err_submit:
0923     kfree_skb(skb);
0924 err_skb:
0925     usb_free_urb(urb);
0926 err_urb:
0927     kfree(rx_buf);
0928 err_rxb:
0929     ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
0930     return ret;
0931 }
0932 
0933 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
0934 {
0935     usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
0936 }
0937 
0938 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
0939 {
0940     struct rx_buf *rx_buf = NULL;
0941     struct sk_buff *skb = NULL;
0942     struct urb *urb = NULL;
0943     int i, ret;
0944 
0945     init_usb_anchor(&hif_dev->reg_in_submitted);
0946 
0947     for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
0948 
0949         rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
0950         if (!rx_buf) {
0951             ret = -ENOMEM;
0952             goto err_rxb;
0953         }
0954 
0955         /* Allocate URB */
0956         urb = usb_alloc_urb(0, GFP_KERNEL);
0957         if (urb == NULL) {
0958             ret = -ENOMEM;
0959             goto err_urb;
0960         }
0961 
0962         /* Allocate buffer */
0963         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
0964         if (!skb) {
0965             ret = -ENOMEM;
0966             goto err_skb;
0967         }
0968 
0969         rx_buf->hif_dev = hif_dev;
0970         rx_buf->skb = skb;
0971 
0972         usb_fill_int_urb(urb, hif_dev->udev,
0973                   usb_rcvintpipe(hif_dev->udev,
0974                           USB_REG_IN_PIPE),
0975                   skb->data, MAX_REG_IN_BUF_SIZE,
0976                   ath9k_hif_usb_reg_in_cb, rx_buf, 1);
0977 
0978         /* Anchor URB */
0979         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
0980 
0981         /* Submit URB */
0982         ret = usb_submit_urb(urb, GFP_KERNEL);
0983         if (ret) {
0984             usb_unanchor_urb(urb);
0985             goto err_submit;
0986         }
0987 
0988         /*
0989          * Drop reference count.
0990          * This ensures that the URB is freed when killing them.
0991          */
0992         usb_free_urb(urb);
0993     }
0994 
0995     return 0;
0996 
0997 err_submit:
0998     kfree_skb(skb);
0999 err_skb:
1000     usb_free_urb(urb);
1001 err_urb:
1002     kfree(rx_buf);
1003 err_rxb:
1004     ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
1005     return ret;
1006 }
1007 
1008 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
1009 {
1010     /* Register Write */
1011     init_usb_anchor(&hif_dev->regout_submitted);
1012 
1013     /* TX */
1014     if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
1015         goto err;
1016 
1017     /* RX */
1018     if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
1019         goto err_rx;
1020 
1021     /* Register Read */
1022     if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
1023         goto err_reg;
1024 
1025     return 0;
1026 err_reg:
1027     ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
1028 err_rx:
1029     ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
1030 err:
1031     return -ENOMEM;
1032 }
1033 
1034 void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
1035 {
1036     usb_kill_anchored_urbs(&hif_dev->regout_submitted);
1037     ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
1038     ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
1039     ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
1040 }
1041 
1042 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
1043 {
1044     int transfer, err;
1045     const void *data = hif_dev->fw_data;
1046     size_t len = hif_dev->fw_size;
1047     u32 addr = AR9271_FIRMWARE;
1048     u8 *buf = kzalloc(4096, GFP_KERNEL);
1049     u32 firm_offset;
1050 
1051     if (!buf)
1052         return -ENOMEM;
1053 
1054     while (len) {
1055         transfer = min_t(size_t, len, 4096);
1056         memcpy(buf, data, transfer);
1057 
1058         err = usb_control_msg(hif_dev->udev,
1059                       usb_sndctrlpipe(hif_dev->udev, 0),
1060                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1061                       addr >> 8, 0, buf, transfer,
1062                       USB_MSG_TIMEOUT);
1063         if (err < 0) {
1064             kfree(buf);
1065             return err;
1066         }
1067 
1068         len -= transfer;
1069         data += transfer;
1070         addr += transfer;
1071     }
1072     kfree(buf);
1073 
1074     if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1075         firm_offset = AR7010_FIRMWARE_TEXT;
1076     else
1077         firm_offset = AR9271_FIRMWARE_TEXT;
1078 
1079     /*
1080      * Issue FW download complete command to firmware.
1081      */
1082     err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1083                   FIRMWARE_DOWNLOAD_COMP,
1084                   0x40 | USB_DIR_OUT,
1085                   firm_offset >> 8, 0, NULL, 0, USB_MSG_TIMEOUT);
1086     if (err)
1087         return -EIO;
1088 
1089     dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1090          hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1091 
1092     return 0;
1093 }
1094 
1095 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1096 {
1097     int ret;
1098 
1099     ret = ath9k_hif_usb_download_fw(hif_dev);
1100     if (ret) {
1101         dev_err(&hif_dev->udev->dev,
1102             "ath9k_htc: Firmware - %s download failed\n",
1103             hif_dev->fw_name);
1104         return ret;
1105     }
1106 
1107     /* Alloc URBs */
1108     ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1109     if (ret) {
1110         dev_err(&hif_dev->udev->dev,
1111             "ath9k_htc: Unable to allocate URBs\n");
1112         return ret;
1113     }
1114 
1115     return 0;
1116 }
1117 
1118 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1119 {
1120     ath9k_hif_usb_dealloc_urbs(hif_dev);
1121 }
1122 
1123 /*
1124  * If initialization fails or the FW cannot be retrieved,
1125  * detach the device.
1126  */
1127 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1128 {
1129     struct device *dev = &hif_dev->udev->dev;
1130     struct device *parent = dev->parent;
1131 
1132     complete_all(&hif_dev->fw_done);
1133 
1134     if (parent)
1135         device_lock(parent);
1136 
1137     device_release_driver(dev);
1138 
1139     if (parent)
1140         device_unlock(parent);
1141 }
1142 
1143 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context);
1144 
1145 /* taken from iwlwifi */
1146 static int ath9k_hif_request_firmware(struct hif_device_usb *hif_dev,
1147                       bool first)
1148 {
1149     char index[8], *chip;
1150     int ret;
1151 
1152     if (first) {
1153         if (htc_use_dev_fw) {
1154             hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX + 1;
1155             sprintf(index, "%s", "dev");
1156         } else {
1157             hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX;
1158             sprintf(index, "%d", hif_dev->fw_minor_index);
1159         }
1160     } else {
1161         hif_dev->fw_minor_index--;
1162         sprintf(index, "%d", hif_dev->fw_minor_index);
1163     }
1164 
1165     /* test for FW 1.3 */
1166     if (MAJOR_VERSION_REQ == 1 && hif_dev->fw_minor_index == 3) {
1167         const char *filename;
1168 
1169         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1170             filename = FIRMWARE_AR7010_1_1;
1171         else
1172             filename = FIRMWARE_AR9271;
1173 
1174         /* expected fw locations:
1175          * - htc_9271.fw   (stable version 1.3, depricated)
1176          */
1177         snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1178              "%s", filename);
1179 
1180     } else if (hif_dev->fw_minor_index < FIRMWARE_MINOR_IDX_MIN) {
1181         dev_err(&hif_dev->udev->dev, "no suitable firmware found!\n");
1182 
1183         return -ENOENT;
1184     } else {
1185         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1186             chip = "7010";
1187         else
1188             chip = "9271";
1189 
1190         /* expected fw locations:
1191          * - ath9k_htc/htc_9271-1.dev.0.fw (development version)
1192          * - ath9k_htc/htc_9271-1.4.0.fw   (stable version)
1193          */
1194         snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1195              "%s/htc_%s-%d.%s.0.fw", HTC_FW_PATH,
1196              chip, MAJOR_VERSION_REQ, index);
1197     }
1198 
1199     ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1200                       &hif_dev->udev->dev, GFP_KERNEL,
1201                       hif_dev, ath9k_hif_usb_firmware_cb);
1202     if (ret) {
1203         dev_err(&hif_dev->udev->dev,
1204             "ath9k_htc: Async request for firmware %s failed\n",
1205             hif_dev->fw_name);
1206         return ret;
1207     }
1208 
1209     dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1210          hif_dev->fw_name);
1211 
1212     return ret;
1213 }
1214 
1215 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1216 {
1217     struct hif_device_usb *hif_dev = context;
1218     int ret;
1219 
1220     if (!fw) {
1221         ret = ath9k_hif_request_firmware(hif_dev, false);
1222         if (!ret)
1223             return;
1224 
1225         dev_err(&hif_dev->udev->dev,
1226             "ath9k_htc: Failed to get firmware %s\n",
1227             hif_dev->fw_name);
1228         goto err_fw;
1229     }
1230 
1231     hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1232                          &hif_dev->udev->dev);
1233     if (hif_dev->htc_handle == NULL)
1234         goto err_dev_alloc;
1235 
1236     hif_dev->fw_data = fw->data;
1237     hif_dev->fw_size = fw->size;
1238 
1239     /* Proceed with initialization */
1240 
1241     ret = ath9k_hif_usb_dev_init(hif_dev);
1242     if (ret)
1243         goto err_dev_init;
1244 
1245     ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1246                 &hif_dev->interface->dev,
1247                 hif_dev->usb_device_id->idProduct,
1248                 hif_dev->udev->product,
1249                 hif_dev->usb_device_id->driver_info);
1250     if (ret) {
1251         ret = -EINVAL;
1252         goto err_htc_hw_init;
1253     }
1254 
1255     release_firmware(fw);
1256     hif_dev->flags |= HIF_USB_READY;
1257     complete_all(&hif_dev->fw_done);
1258 
1259     return;
1260 
1261 err_htc_hw_init:
1262     ath9k_hif_usb_dev_deinit(hif_dev);
1263 err_dev_init:
1264     ath9k_htc_hw_free(hif_dev->htc_handle);
1265 err_dev_alloc:
1266     release_firmware(fw);
1267 err_fw:
1268     ath9k_hif_usb_firmware_fail(hif_dev);
1269 }
1270 
1271 /*
1272  * An exact copy of the function from zd1211rw.
1273  */
1274 static int send_eject_command(struct usb_interface *interface)
1275 {
1276     struct usb_device *udev = interface_to_usbdev(interface);
1277     struct usb_host_interface *iface_desc = interface->cur_altsetting;
1278     struct usb_endpoint_descriptor *endpoint;
1279     unsigned char *cmd;
1280     u8 bulk_out_ep;
1281     int r;
1282 
1283     if (iface_desc->desc.bNumEndpoints < 2)
1284         return -ENODEV;
1285 
1286     /* Find bulk out endpoint */
1287     for (r = 1; r >= 0; r--) {
1288         endpoint = &iface_desc->endpoint[r].desc;
1289         if (usb_endpoint_dir_out(endpoint) &&
1290             usb_endpoint_xfer_bulk(endpoint)) {
1291             bulk_out_ep = endpoint->bEndpointAddress;
1292             break;
1293         }
1294     }
1295     if (r == -1) {
1296         dev_err(&udev->dev,
1297             "ath9k_htc: Could not find bulk out endpoint\n");
1298         return -ENODEV;
1299     }
1300 
1301     cmd = kzalloc(31, GFP_KERNEL);
1302     if (cmd == NULL)
1303         return -ENODEV;
1304 
1305     /* USB bulk command block */
1306     cmd[0] = 0x55;  /* bulk command signature */
1307     cmd[1] = 0x53;  /* bulk command signature */
1308     cmd[2] = 0x42;  /* bulk command signature */
1309     cmd[3] = 0x43;  /* bulk command signature */
1310     cmd[14] = 6;    /* command length */
1311 
1312     cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1313     cmd[19] = 0x2;  /* eject disc */
1314 
1315     dev_info(&udev->dev, "Ejecting storage device...\n");
1316     r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1317         cmd, 31, NULL, 2 * USB_MSG_TIMEOUT);
1318     kfree(cmd);
1319     if (r)
1320         return r;
1321 
1322     /* At this point, the device disconnects and reconnects with the real
1323      * ID numbers. */
1324 
1325     usb_set_intfdata(interface, NULL);
1326     return 0;
1327 }
1328 
1329 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1330                    const struct usb_device_id *id)
1331 {
1332     struct usb_device *udev = interface_to_usbdev(interface);
1333     struct hif_device_usb *hif_dev;
1334     int ret = 0;
1335 
1336     if (id->driver_info == STORAGE_DEVICE)
1337         return send_eject_command(interface);
1338 
1339     hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1340     if (!hif_dev) {
1341         ret = -ENOMEM;
1342         goto err_alloc;
1343     }
1344 
1345     usb_get_dev(udev);
1346 
1347     hif_dev->udev = udev;
1348     hif_dev->interface = interface;
1349     hif_dev->usb_device_id = id;
1350 #ifdef CONFIG_PM
1351     udev->reset_resume = 1;
1352 #endif
1353     usb_set_intfdata(interface, hif_dev);
1354 
1355     init_completion(&hif_dev->fw_done);
1356 
1357     ret = ath9k_hif_request_firmware(hif_dev, true);
1358     if (ret)
1359         goto err_fw_req;
1360 
1361     return ret;
1362 
1363 err_fw_req:
1364     usb_set_intfdata(interface, NULL);
1365     kfree(hif_dev);
1366     usb_put_dev(udev);
1367 err_alloc:
1368     return ret;
1369 }
1370 
1371 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1372 {
1373     u32 reboot_cmd = 0xffffffff;
1374     void *buf;
1375     int ret;
1376 
1377     buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1378     if (!buf)
1379         return;
1380 
1381     ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
1382                buf, 4, NULL, USB_MSG_TIMEOUT);
1383     if (ret)
1384         dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1385 
1386     kfree(buf);
1387 }
1388 
1389 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1390 {
1391     struct usb_device *udev = interface_to_usbdev(interface);
1392     struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1393     bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1394 
1395     if (!hif_dev)
1396         return;
1397 
1398     wait_for_completion(&hif_dev->fw_done);
1399 
1400     if (hif_dev->flags & HIF_USB_READY) {
1401         ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1402         ath9k_hif_usb_dev_deinit(hif_dev);
1403         ath9k_destroy_wmi(hif_dev->htc_handle->drv_priv);
1404         ath9k_htc_hw_free(hif_dev->htc_handle);
1405     }
1406 
1407     usb_set_intfdata(interface, NULL);
1408 
1409     /* If firmware was loaded we should drop it
1410      * go back to first stage bootloader. */
1411     if (!unplugged && (hif_dev->flags & HIF_USB_READY))
1412         ath9k_hif_usb_reboot(udev);
1413 
1414     kfree(hif_dev);
1415     dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1416     usb_put_dev(udev);
1417 }
1418 
1419 #ifdef CONFIG_PM
1420 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1421                  pm_message_t message)
1422 {
1423     struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1424 
1425     /*
1426      * The device has to be set to FULLSLEEP mode in case no
1427      * interface is up.
1428      */
1429     if (!(hif_dev->flags & HIF_USB_START))
1430         ath9k_htc_suspend(hif_dev->htc_handle);
1431 
1432     wait_for_completion(&hif_dev->fw_done);
1433 
1434     if (hif_dev->flags & HIF_USB_READY)
1435         ath9k_hif_usb_dealloc_urbs(hif_dev);
1436 
1437     return 0;
1438 }
1439 
1440 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1441 {
1442     struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1443     struct htc_target *htc_handle = hif_dev->htc_handle;
1444     int ret;
1445     const struct firmware *fw;
1446 
1447     ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1448     if (ret)
1449         return ret;
1450 
1451     if (hif_dev->flags & HIF_USB_READY) {
1452         /* request cached firmware during suspend/resume cycle */
1453         ret = request_firmware(&fw, hif_dev->fw_name,
1454                        &hif_dev->udev->dev);
1455         if (ret)
1456             goto fail_resume;
1457 
1458         hif_dev->fw_data = fw->data;
1459         hif_dev->fw_size = fw->size;
1460         ret = ath9k_hif_usb_download_fw(hif_dev);
1461         release_firmware(fw);
1462         if (ret)
1463             goto fail_resume;
1464     } else {
1465         ath9k_hif_usb_dealloc_urbs(hif_dev);
1466         return -EIO;
1467     }
1468 
1469     mdelay(100);
1470 
1471     ret = ath9k_htc_resume(htc_handle);
1472 
1473     if (ret)
1474         goto fail_resume;
1475 
1476     return 0;
1477 
1478 fail_resume:
1479     ath9k_hif_usb_dealloc_urbs(hif_dev);
1480 
1481     return ret;
1482 }
1483 #endif
1484 
1485 static struct usb_driver ath9k_hif_usb_driver = {
1486     .name = KBUILD_MODNAME,
1487     .probe = ath9k_hif_usb_probe,
1488     .disconnect = ath9k_hif_usb_disconnect,
1489 #ifdef CONFIG_PM
1490     .suspend = ath9k_hif_usb_suspend,
1491     .resume = ath9k_hif_usb_resume,
1492     .reset_resume = ath9k_hif_usb_resume,
1493 #endif
1494     .id_table = ath9k_hif_usb_ids,
1495     .soft_unbind = 1,
1496     .disable_hub_initiated_lpm = 1,
1497 };
1498 
1499 int ath9k_hif_usb_init(void)
1500 {
1501     return usb_register(&ath9k_hif_usb_driver);
1502 }
1503 
1504 void ath9k_hif_usb_exit(void)
1505 {
1506     usb_deregister(&ath9k_hif_usb_driver);
1507 }
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