1 files changed, 1108 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath10k/usb.c b/drivers/net/wireless/ath/ath10k/usb.c
new file mode 100644
index 0000000..267a7ff
--- /dev/null
+++ b/drivers/net/wireless/ath/ath10k/usb.c
@@ -0,0 +1,1108 @@
+/*
+ * Copyright (c) 2007-2011 Atheros Communications Inc.
+ * Copyright (c) 2011-2012,2017 Qualcomm Atheros, Inc.
+ * Copyright (c) 2016-2017 Erik Stromdahl <erik.stromdahl@gmail.com>
+ *
+ * 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/usb.h>
+
+#include "debug.h"
+#include "core.h"
+#include "bmi.h"
+#include "hif.h"
+#include "htc.h"
+#include "usb.h"
+
+static void ath10k_usb_post_recv_transfers(struct ath10k *ar,
+					   struct ath10k_usb_pipe *recv_pipe);
+
+/* inlined helper functions */
+
+static inline enum ath10k_htc_ep_id
+eid_from_htc_hdr(struct ath10k_htc_hdr *htc_hdr)
+{
+	return (enum ath10k_htc_ep_id)htc_hdr->eid;
+}
+
+static inline bool is_trailer_only_msg(struct ath10k_htc_hdr *htc_hdr)
+{
+	return __le16_to_cpu(htc_hdr->len) == htc_hdr->trailer_len;
+}
+
+/* pipe/urb operations */
+static struct ath10k_urb_context *
+ath10k_usb_alloc_urb_from_pipe(struct ath10k_usb_pipe *pipe)
+{
+	struct ath10k_urb_context *urb_context = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&pipe->ar_usb->cs_lock, flags);
+	if (!list_empty(&pipe->urb_list_head)) {
+		urb_context = list_first_entry(&pipe->urb_list_head,
+					       struct ath10k_urb_context, link);
+		list_del(&urb_context->link);
+		pipe->urb_cnt--;
+	}
+	spin_unlock_irqrestore(&pipe->ar_usb->cs_lock, flags);
+
+	return urb_context;
+}
+
+static void ath10k_usb_free_urb_to_pipe(struct ath10k_usb_pipe *pipe,
+					struct ath10k_urb_context *urb_context)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&pipe->ar_usb->cs_lock, flags);
+
+	pipe->urb_cnt++;
+	list_add(&urb_context->link, &pipe->urb_list_head);
+
+	spin_unlock_irqrestore(&pipe->ar_usb->cs_lock, flags);
+}
+
+static void ath10k_usb_cleanup_recv_urb(struct ath10k_urb_context *urb_context)
+{
+	dev_kfree_skb(urb_context->skb);
+	urb_context->skb = NULL;
+
+	ath10k_usb_free_urb_to_pipe(urb_context->pipe, urb_context);
+}
+
+static void ath10k_usb_free_pipe_resources(struct ath10k *ar,
+					   struct ath10k_usb_pipe *pipe)
+{
+	struct ath10k_urb_context *urb_context;
+
+	if (!pipe->ar_usb) {
+		/* nothing allocated for this pipe */
+		return;
+	}
+
+	ath10k_dbg(ar, ATH10K_DBG_USB,
+		   "usb free resources lpipe %d hpipe 0x%x urbs %d avail %d\n",
+		   pipe->logical_pipe_num, pipe->usb_pipe_handle,
+		   pipe->urb_alloc, pipe->urb_cnt);
+
+	if (pipe->urb_alloc != pipe->urb_cnt) {
+		ath10k_dbg(ar, ATH10K_DBG_USB,
+			   "usb urb leak lpipe %d hpipe 0x%x urbs %d avail %d\n",
+			   pipe->logical_pipe_num, pipe->usb_pipe_handle,
+			   pipe->urb_alloc, pipe->urb_cnt);
+	}
+
+	for (;;) {
+		urb_context = ath10k_usb_alloc_urb_from_pipe(pipe);
+
+		if (!urb_context)
+			break;
+
+		kfree(urb_context);
+	}
+}
+
+static void ath10k_usb_cleanup_pipe_resources(struct ath10k *ar)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+	int i;
+
+	for (i = 0; i < ATH10K_USB_PIPE_MAX; i++)
+		ath10k_usb_free_pipe_resources(ar, &ar_usb->pipes[i]);
+}
+
+/* hif usb rx/tx completion functions */
+
+static void ath10k_usb_recv_complete(struct urb *urb)
+{
+	struct ath10k_urb_context *urb_context = urb->context;
+	struct ath10k_usb_pipe *pipe = urb_context->pipe;
+	struct ath10k *ar = pipe->ar_usb->ar;
+	struct sk_buff *skb;
+	int status = 0;
+
+	ath10k_dbg(ar, ATH10K_DBG_USB_BULK,
+		   "usb recv pipe %d stat %d len %d urb 0x%pK\n",
+		   pipe->logical_pipe_num, urb->status, urb->actual_length,
+		   urb);
+
+	if (urb->status != 0) {
+		status = -EIO;
+		switch (urb->status) {
+		case -ECONNRESET:
+		case -ENOENT:
+		case -ESHUTDOWN:
+			/* no need to spew these errors when device
+			 * removed or urb killed due to driver shutdown
+			 */
+			status = -ECANCELED;
+			break;
+		default:
+			ath10k_dbg(ar, ATH10K_DBG_USB_BULK,
+				   "usb recv pipe %d ep 0x%2.2x failed: %d\n",
+				   pipe->logical_pipe_num,
+				   pipe->ep_address, urb->status);
+			break;
+		}
+		goto cleanup_recv_urb;
+	}
+
+	if (urb->actual_length == 0)
+		goto cleanup_recv_urb;
+
+	skb = urb_context->skb;
+
+	/* we are going to pass it up */
+	urb_context->skb = NULL;
+	skb_put(skb, urb->actual_length);
+
+	/* note: queue implements a lock */
+	skb_queue_tail(&pipe->io_comp_queue, skb);
+	schedule_work(&pipe->io_complete_work);
+
+cleanup_recv_urb:
+	ath10k_usb_cleanup_recv_urb(urb_context);
+
+	if (status == 0 &&
+	    pipe->urb_cnt >= pipe->urb_cnt_thresh) {
+		/* our free urbs are piling up, post more transfers */
+		ath10k_usb_post_recv_transfers(ar, pipe);
+	}
+}
+
+static void ath10k_usb_transmit_complete(struct urb *urb)
+{
+	struct ath10k_urb_context *urb_context = urb->context;
+	struct ath10k_usb_pipe *pipe = urb_context->pipe;
+	struct ath10k *ar = pipe->ar_usb->ar;
+	struct sk_buff *skb;
+
+	if (urb->status != 0) {
+		ath10k_dbg(ar, ATH10K_DBG_USB_BULK,
+			   "pipe: %d, failed:%d\n",
+			   pipe->logical_pipe_num, urb->status);
+	}
+
+	skb = urb_context->skb;
+	urb_context->skb = NULL;
+	ath10k_usb_free_urb_to_pipe(urb_context->pipe, urb_context);
+
+	/* note: queue implements a lock */
+	skb_queue_tail(&pipe->io_comp_queue, skb);
+	schedule_work(&pipe->io_complete_work);
+}
+
+/* pipe operations */
+static void ath10k_usb_post_recv_transfers(struct ath10k *ar,
+					   struct ath10k_usb_pipe *recv_pipe)
+{
+	struct ath10k_urb_context *urb_context;
+	struct urb *urb;
+	int usb_status;
+
+	for (;;) {
+		urb_context = ath10k_usb_alloc_urb_from_pipe(recv_pipe);
+		if (!urb_context)
+			break;
+
+		urb_context->skb = dev_alloc_skb(ATH10K_USB_RX_BUFFER_SIZE);
+		if (!urb_context->skb)
+			goto err;
+
+		urb = usb_alloc_urb(0, GFP_ATOMIC);
+		if (!urb)
+			goto err;
+
+		usb_fill_bulk_urb(urb,
+				  recv_pipe->ar_usb->udev,
+				  recv_pipe->usb_pipe_handle,
+				  urb_context->skb->data,
+				  ATH10K_USB_RX_BUFFER_SIZE,
+				  ath10k_usb_recv_complete, urb_context);
+
+		ath10k_dbg(ar, ATH10K_DBG_USB_BULK,
+			   "usb bulk recv submit %d 0x%x ep 0x%2.2x len %d buf 0x%pK\n",
+			   recv_pipe->logical_pipe_num,
+			   recv_pipe->usb_pipe_handle, recv_pipe->ep_address,
+			   ATH10K_USB_RX_BUFFER_SIZE, urb_context->skb);
+
+		usb_anchor_urb(urb, &recv_pipe->urb_submitted);
+		usb_status = usb_submit_urb(urb, GFP_ATOMIC);
+
+		if (usb_status) {
+			ath10k_dbg(ar, ATH10K_DBG_USB_BULK,
+				   "usb bulk recv failed: %d\n",
+				   usb_status);
+			usb_unanchor_urb(urb);
+			usb_free_urb(urb);
+			goto err;
+		}
+		usb_free_urb(urb);
+	}
+
+	return;
+
+err:
+	ath10k_usb_cleanup_recv_urb(urb_context);
+}
+
+static void ath10k_usb_flush_all(struct ath10k *ar)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+	int i;
+
+	for (i = 0; i < ATH10K_USB_PIPE_MAX; i++) {
+		if (ar_usb->pipes[i].ar_usb) {
+			usb_kill_anchored_urbs(&ar_usb->pipes[i].urb_submitted);
+			cancel_work_sync(&ar_usb->pipes[i].io_complete_work);
+		}
+	}
+}
+
+static void ath10k_usb_start_recv_pipes(struct ath10k *ar)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+
+	ar_usb->pipes[ATH10K_USB_PIPE_RX_DATA].urb_cnt_thresh = 1;
+
+	ath10k_usb_post_recv_transfers(ar,
+				       &ar_usb->pipes[ATH10K_USB_PIPE_RX_DATA]);
+}
+
+static void ath10k_usb_tx_complete(struct ath10k *ar, struct sk_buff *skb)
+{
+	struct ath10k_htc_hdr *htc_hdr;
+	struct ath10k_htc_ep *ep;
+
+	htc_hdr = (struct ath10k_htc_hdr *)skb->data;
+	ep = &ar->htc.endpoint[htc_hdr->eid];
+	ath10k_htc_notify_tx_completion(ep, skb);
+	/* The TX complete handler now owns the skb... */
+}
+
+static void ath10k_usb_rx_complete(struct ath10k *ar, struct sk_buff *skb)
+{
+	struct ath10k_htc *htc = &ar->htc;
+	struct ath10k_htc_hdr *htc_hdr;
+	enum ath10k_htc_ep_id eid;
+	struct ath10k_htc_ep *ep;
+	u16 payload_len;
+	u8 *trailer;
+	int ret;
+
+	htc_hdr = (struct ath10k_htc_hdr *)skb->data;
+	eid = eid_from_htc_hdr(htc_hdr);
+	ep = &ar->htc.endpoint[eid];
+
+	if (ep->service_id == 0) {
+		ath10k_warn(ar, "ep %d is not connected\n", eid);
+		goto out_free_skb;
+	}
+
+	payload_len = le16_to_cpu(htc_hdr->len);
+	if (!payload_len) {
+		ath10k_warn(ar, "zero length frame received, firmware crashed?\n");
+		goto out_free_skb;
+	}
+
+	if (payload_len < htc_hdr->trailer_len) {
+		ath10k_warn(ar, "malformed frame received, firmware crashed?\n");
+		goto out_free_skb;
+	}
+
+	if (htc_hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT) {
+		trailer = skb->data + sizeof(*htc_hdr) + payload_len -
+			  htc_hdr->trailer_len;
+
+		ret = ath10k_htc_process_trailer(htc,
+						 trailer,
+						 htc_hdr->trailer_len,
+						 eid,
+						 NULL,
+						 NULL);
+		if (ret)
+			goto out_free_skb;
+
+		if (is_trailer_only_msg(htc_hdr))
+			goto out_free_skb;
+
+		/* strip off the trailer from the skb since it should not
+		 * be passed on to upper layers
+		 */
+		skb_trim(skb, skb->len - htc_hdr->trailer_len);
+	}
+
+	skb_pull(skb, sizeof(*htc_hdr));
+	ep->ep_ops.ep_rx_complete(ar, skb);
+	/* The RX complete handler now owns the skb... */
+
+	return;
+
+out_free_skb:
+	dev_kfree_skb(skb);
+}
+
+static void ath10k_usb_io_comp_work(struct work_struct *work)
+{
+	struct ath10k_usb_pipe *pipe = container_of(work,
+						    struct ath10k_usb_pipe,
+						    io_complete_work);
+	struct ath10k *ar = pipe->ar_usb->ar;
+	struct sk_buff *skb;
+
+	while ((skb = skb_dequeue(&pipe->io_comp_queue))) {
+		if (pipe->flags & ATH10K_USB_PIPE_FLAG_TX)
+			ath10k_usb_tx_complete(ar, skb);
+		else
+			ath10k_usb_rx_complete(ar, skb);
+	}
+}
+
+#define ATH10K_USB_MAX_DIAG_CMD (sizeof(struct ath10k_usb_ctrl_diag_cmd_write))
+#define ATH10K_USB_MAX_DIAG_RESP (sizeof(struct ath10k_usb_ctrl_diag_resp_read))
+
+static void ath10k_usb_destroy(struct ath10k *ar)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+
+	ath10k_usb_flush_all(ar);
+	ath10k_usb_cleanup_pipe_resources(ar);
+	usb_set_intfdata(ar_usb->interface, NULL);
+
+	kfree(ar_usb->diag_cmd_buffer);
+	kfree(ar_usb->diag_resp_buffer);
+}
+
+static int ath10k_usb_hif_start(struct ath10k *ar)
+{
+	int i;
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+
+	ath10k_usb_start_recv_pipes(ar);
+
+	/* set the TX resource avail threshold for each TX pipe */
+	for (i = ATH10K_USB_PIPE_TX_CTRL;
+	     i <= ATH10K_USB_PIPE_TX_DATA_HP; i++) {
+		ar_usb->pipes[i].urb_cnt_thresh =
+		    ar_usb->pipes[i].urb_alloc / 2;
+	}
+
+	return 0;
+}
+
+static int ath10k_usb_hif_tx_sg(struct ath10k *ar, u8 pipe_id,
+				struct ath10k_hif_sg_item *items, int n_items)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+	struct ath10k_usb_pipe *pipe = &ar_usb->pipes[pipe_id];
+	struct ath10k_urb_context *urb_context;
+	struct sk_buff *skb;
+	struct urb *urb;
+	int ret, i;
+
+	for (i = 0; i < n_items; i++) {
+		urb_context = ath10k_usb_alloc_urb_from_pipe(pipe);
+		if (!urb_context) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		skb = items[i].transfer_context;
+		urb_context->skb = skb;
+
+		urb = usb_alloc_urb(0, GFP_ATOMIC);
+		if (!urb) {
+			ret = -ENOMEM;
+			goto err_free_urb_to_pipe;
+		}
+
+		usb_fill_bulk_urb(urb,
+				  ar_usb->udev,
+				  pipe->usb_pipe_handle,
+				  skb->data,
+				  skb->len,
+				  ath10k_usb_transmit_complete, urb_context);
+
+		if (!(skb->len % pipe->max_packet_size)) {
+			/* hit a max packet boundary on this pipe */
+			urb->transfer_flags |= URB_ZERO_PACKET;
+		}
+
+		usb_anchor_urb(urb, &pipe->urb_submitted);
+		ret = usb_submit_urb(urb, GFP_ATOMIC);
+		if (ret) {
+			ath10k_dbg(ar, ATH10K_DBG_USB_BULK,
+				   "usb bulk transmit failed: %d\n", ret);
+			usb_unanchor_urb(urb);
+			ret = -EINVAL;
+			goto err_free_urb_to_pipe;
+		}
+
+		usb_free_urb(urb);
+	}
+
+	return 0;
+
+err_free_urb_to_pipe:
+	ath10k_usb_free_urb_to_pipe(urb_context->pipe, urb_context);
+err:
+	return ret;
+}
+
+static void ath10k_usb_hif_stop(struct ath10k *ar)
+{
+	ath10k_usb_flush_all(ar);
+}
+
+static u16 ath10k_usb_hif_get_free_queue_number(struct ath10k *ar, u8 pipe_id)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+
+	return ar_usb->pipes[pipe_id].urb_cnt;
+}
+
+static int ath10k_usb_submit_ctrl_out(struct ath10k *ar,
+				      u8 req, u16 value, u16 index, void *data,
+				      u32 size)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+	u8 *buf = NULL;
+	int ret;
+
+	if (size > 0) {
+		buf = kmemdup(data, size, GFP_KERNEL);
+		if (!buf)
+			return -ENOMEM;
+	}
+
+	/* note: if successful returns number of bytes transferred */
+	ret = usb_control_msg(ar_usb->udev,
+			      usb_sndctrlpipe(ar_usb->udev, 0),
+			      req,
+			      USB_DIR_OUT | USB_TYPE_VENDOR |
+			      USB_RECIP_DEVICE, value, index, buf,
+			      size, 1000);
+
+	if (ret < 0) {
+		ath10k_warn(ar, "Failed to submit usb control message: %d\n",
+			    ret);
+		kfree(buf);
+		return ret;
+	}
+
+	kfree(buf);
+
+	return 0;
+}
+
+static int ath10k_usb_submit_ctrl_in(struct ath10k *ar,
+				     u8 req, u16 value, u16 index, void *data,
+				     u32 size)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+	u8 *buf = NULL;
+	int ret;
+
+	if (size > 0) {
+		buf = kmalloc(size, GFP_KERNEL);
+		if (!buf)
+			return -ENOMEM;
+	}
+
+	/* note: if successful returns number of bytes transferred */
+	ret = usb_control_msg(ar_usb->udev,
+			      usb_rcvctrlpipe(ar_usb->udev, 0),
+			      req,
+			      USB_DIR_IN | USB_TYPE_VENDOR |
+			      USB_RECIP_DEVICE, value, index, buf,
+			      size, 2 * HZ);
+
+	if (ret < 0) {
+		ath10k_warn(ar, "Failed to read usb control message: %d\n",
+			    ret);
+		kfree(buf);
+		return ret;
+	}
+
+	memcpy((u8 *)data, buf, size);
+
+	kfree(buf);
+
+	return 0;
+}
+
+static int ath10k_usb_ctrl_msg_exchange(struct ath10k *ar,
+					u8 req_val, u8 *req_buf, u32 req_len,
+					u8 resp_val, u8 *resp_buf,
+					u32 *resp_len)
+{
+	int ret;
+
+	/* send command */
+	ret = ath10k_usb_submit_ctrl_out(ar, req_val, 0, 0,
+					 req_buf, req_len);
+	if (ret)
+		goto err;
+
+	/* get response */
+	if (resp_buf) {
+		ret = ath10k_usb_submit_ctrl_in(ar, resp_val, 0, 0,
+						resp_buf, *resp_len);
+		if (ret)
+			goto err;
+	}
+
+	return 0;
+err:
+	return ret;
+}
+
+static int ath10k_usb_hif_diag_read(struct ath10k *ar, u32 address, void *buf,
+				    size_t buf_len)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+	struct ath10k_usb_ctrl_diag_cmd_read *cmd;
+	u32 resp_len;
+	int ret;
+
+	if (buf_len < sizeof(struct ath10k_usb_ctrl_diag_resp_read))
+		return -EINVAL;
+
+	cmd = (struct ath10k_usb_ctrl_diag_cmd_read *)ar_usb->diag_cmd_buffer;
+	memset(cmd, 0, sizeof(*cmd));
+	cmd->cmd = ATH10K_USB_CTRL_DIAG_CC_READ;
+	cmd->address = cpu_to_le32(address);
+	resp_len = sizeof(struct ath10k_usb_ctrl_diag_resp_read);
+
+	ret = ath10k_usb_ctrl_msg_exchange(ar,
+					   ATH10K_USB_CONTROL_REQ_DIAG_CMD,
+					   (u8 *)cmd,
+					   sizeof(*cmd),
+					   ATH10K_USB_CONTROL_REQ_DIAG_RESP,
+					   ar_usb->diag_resp_buffer, &resp_len);
+	if (ret)
+		return ret;
+
+	if (resp_len != sizeof(struct ath10k_usb_ctrl_diag_resp_read))
+		return -EMSGSIZE;
+
+	memcpy(buf, ar_usb->diag_resp_buffer,
+	       sizeof(struct ath10k_usb_ctrl_diag_resp_read));
+
+	return 0;
+}
+
+static int ath10k_usb_hif_diag_write(struct ath10k *ar, u32 address,
+				     const void *data, int nbytes)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+	struct ath10k_usb_ctrl_diag_cmd_write *cmd;
+	int ret;
+
+	if (nbytes != sizeof(cmd->value))
+		return -EINVAL;
+
+	cmd = (struct ath10k_usb_ctrl_diag_cmd_write *)ar_usb->diag_cmd_buffer;
+	memset(cmd, 0, sizeof(*cmd));
+	cmd->cmd = cpu_to_le32(ATH10K_USB_CTRL_DIAG_CC_WRITE);
+	cmd->address = cpu_to_le32(address);
+	memcpy(&cmd->value, data, nbytes);
+
+	ret = ath10k_usb_ctrl_msg_exchange(ar,
+					   ATH10K_USB_CONTROL_REQ_DIAG_CMD,
+					   (u8 *)cmd,
+					   sizeof(*cmd),
+					   0, NULL, NULL);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int ath10k_usb_bmi_exchange_msg(struct ath10k *ar,
+				       void *req, u32 req_len,
+				       void *resp, u32 *resp_len)
+{
+	int ret;
+
+	if (req) {
+		ret = ath10k_usb_submit_ctrl_out(ar,
+						 ATH10K_USB_CONTROL_REQ_SEND_BMI_CMD,
+						 0, 0, req, req_len);
+		if (ret) {
+			ath10k_warn(ar,
+				    "unable to send the bmi data to the device: %d\n",
+				    ret);
+			return ret;
+		}
+	}
+
+	if (resp) {
+		ret = ath10k_usb_submit_ctrl_in(ar,
+						ATH10K_USB_CONTROL_REQ_RECV_BMI_RESP,
+						0, 0, resp, *resp_len);
+		if (ret) {
+			ath10k_warn(ar,
+				    "Unable to read the bmi data from the device: %d\n",
+				    ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static void ath10k_usb_hif_get_default_pipe(struct ath10k *ar,
+					    u8 *ul_pipe, u8 *dl_pipe)
+{
+	*ul_pipe = ATH10K_USB_PIPE_TX_CTRL;
+	*dl_pipe = ATH10K_USB_PIPE_RX_CTRL;
+}
+
+static int ath10k_usb_hif_map_service_to_pipe(struct ath10k *ar, u16 svc_id,
+					      u8 *ul_pipe, u8 *dl_pipe)
+{
+	switch (svc_id) {
+	case ATH10K_HTC_SVC_ID_RSVD_CTRL:
+	case ATH10K_HTC_SVC_ID_WMI_CONTROL:
+		*ul_pipe = ATH10K_USB_PIPE_TX_CTRL;
+		/* due to large control packets, shift to data pipe */
+		*dl_pipe = ATH10K_USB_PIPE_RX_DATA;
+		break;
+	case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
+		*ul_pipe = ATH10K_USB_PIPE_TX_DATA_LP;
+		/* Disable rxdata2 directly, it will be enabled
+		 * if FW enable rxdata2
+		 */
+		*dl_pipe = ATH10K_USB_PIPE_RX_DATA;
+		break;
+	default:
+		return -EPERM;
+	}
+
+	return 0;
+}
+
+/* This op is currently only used by htc_wait_target if the HTC ready
+ * message times out. It is not applicable for USB since there is nothing
+ * we can do if the HTC ready message does not arrive in time.
+ * TODO: Make this op non mandatory by introducing a NULL check in the
+ * hif op wrapper.
+ */
+static void ath10k_usb_hif_send_complete_check(struct ath10k *ar,
+					       u8 pipe, int force)
+{
+}
+
+static int ath10k_usb_hif_power_up(struct ath10k *ar)
+{
+	return 0;
+}
+
+static void ath10k_usb_hif_power_down(struct ath10k *ar)
+{
+	ath10k_usb_flush_all(ar);
+}
+
+#ifdef CONFIG_PM
+
+static int ath10k_usb_hif_suspend(struct ath10k *ar)
+{
+	return -EOPNOTSUPP;
+}
+
+static int ath10k_usb_hif_resume(struct ath10k *ar)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
+static const struct ath10k_hif_ops ath10k_usb_hif_ops = {
+	.tx_sg			= ath10k_usb_hif_tx_sg,
+	.diag_read		= ath10k_usb_hif_diag_read,
+	.diag_write		= ath10k_usb_hif_diag_write,
+	.exchange_bmi_msg	= ath10k_usb_bmi_exchange_msg,
+	.start			= ath10k_usb_hif_start,
+	.stop			= ath10k_usb_hif_stop,
+	.map_service_to_pipe	= ath10k_usb_hif_map_service_to_pipe,
+	.get_default_pipe	= ath10k_usb_hif_get_default_pipe,
+	.send_complete_check	= ath10k_usb_hif_send_complete_check,
+	.get_free_queue_number	= ath10k_usb_hif_get_free_queue_number,
+	.power_up		= ath10k_usb_hif_power_up,
+	.power_down		= ath10k_usb_hif_power_down,
+#ifdef CONFIG_PM
+	.suspend		= ath10k_usb_hif_suspend,
+	.resume			= ath10k_usb_hif_resume,
+#endif
+};
+
+static u8 ath10k_usb_get_logical_pipe_num(u8 ep_address, int *urb_count)
+{
+	u8 pipe_num = ATH10K_USB_PIPE_INVALID;
+
+	switch (ep_address) {
+	case ATH10K_USB_EP_ADDR_APP_CTRL_IN:
+		pipe_num = ATH10K_USB_PIPE_RX_CTRL;
+		*urb_count = RX_URB_COUNT;
+		break;
+	case ATH10K_USB_EP_ADDR_APP_DATA_IN:
+		pipe_num = ATH10K_USB_PIPE_RX_DATA;
+		*urb_count = RX_URB_COUNT;
+		break;
+	case ATH10K_USB_EP_ADDR_APP_INT_IN:
+		pipe_num = ATH10K_USB_PIPE_RX_INT;
+		*urb_count = RX_URB_COUNT;
+		break;
+	case ATH10K_USB_EP_ADDR_APP_DATA2_IN:
+		pipe_num = ATH10K_USB_PIPE_RX_DATA2;
+		*urb_count = RX_URB_COUNT;
+		break;
+	case ATH10K_USB_EP_ADDR_APP_CTRL_OUT:
+		pipe_num = ATH10K_USB_PIPE_TX_CTRL;
+		*urb_count = TX_URB_COUNT;
+		break;
+	case ATH10K_USB_EP_ADDR_APP_DATA_LP_OUT:
+		pipe_num = ATH10K_USB_PIPE_TX_DATA_LP;
+		*urb_count = TX_URB_COUNT;
+		break;
+	case ATH10K_USB_EP_ADDR_APP_DATA_MP_OUT:
+		pipe_num = ATH10K_USB_PIPE_TX_DATA_MP;
+		*urb_count = TX_URB_COUNT;
+		break;
+	case ATH10K_USB_EP_ADDR_APP_DATA_HP_OUT:
+		pipe_num = ATH10K_USB_PIPE_TX_DATA_HP;
+		*urb_count = TX_URB_COUNT;
+		break;
+	default:
+		/* note: there may be endpoints not currently used */
+		break;
+	}
+
+	return pipe_num;
+}
+
+static int ath10k_usb_alloc_pipe_resources(struct ath10k *ar,
+					   struct ath10k_usb_pipe *pipe,
+					   int urb_cnt)
+{
+	struct ath10k_urb_context *urb_context;
+	int i;
+
+	INIT_LIST_HEAD(&pipe->urb_list_head);
+	init_usb_anchor(&pipe->urb_submitted);
+
+	for (i = 0; i < urb_cnt; i++) {
+		urb_context = kzalloc(sizeof(*urb_context), GFP_KERNEL);
+		if (!urb_context)
+			return -ENOMEM;
+
+		urb_context->pipe = pipe;
+
+		/* we are only allocate the urb contexts here, the actual URB
+		 * is allocated from the kernel as needed to do a transaction
+		 */
+		pipe->urb_alloc++;
+		ath10k_usb_free_urb_to_pipe(pipe, urb_context);
+	}
+
+	ath10k_dbg(ar, ATH10K_DBG_USB,
+		   "usb alloc resources lpipe %d hpipe 0x%x urbs %d\n",
+		   pipe->logical_pipe_num, pipe->usb_pipe_handle,
+		   pipe->urb_alloc);
+
+	return 0;
+}
+
+static int ath10k_usb_setup_pipe_resources(struct ath10k *ar,
+					   struct usb_interface *interface)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+	struct usb_host_interface *iface_desc = interface->cur_altsetting;
+	struct usb_endpoint_descriptor *endpoint;
+	struct ath10k_usb_pipe *pipe;
+	int ret, i, urbcount;
+	u8 pipe_num;
+
+	ath10k_dbg(ar, ATH10K_DBG_USB, "usb setting up pipes using interface\n");
+
+	/* walk decriptors and setup pipes */
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		endpoint = &iface_desc->endpoint[i].desc;
+
+		if (ATH10K_USB_IS_BULK_EP(endpoint->bmAttributes)) {
+			ath10k_dbg(ar, ATH10K_DBG_USB,
+				   "usb %s bulk ep 0x%2.2x maxpktsz %d\n",
+				   ATH10K_USB_IS_DIR_IN
+				   (endpoint->bEndpointAddress) ?
+				   "rx" : "tx", endpoint->bEndpointAddress,
+				   le16_to_cpu(endpoint->wMaxPacketSize));
+		} else if (ATH10K_USB_IS_INT_EP(endpoint->bmAttributes)) {
+			ath10k_dbg(ar, ATH10K_DBG_USB,
+				   "usb %s int ep 0x%2.2x maxpktsz %d interval %d\n",
+				   ATH10K_USB_IS_DIR_IN
+				   (endpoint->bEndpointAddress) ?
+				   "rx" : "tx", endpoint->bEndpointAddress,
+				   le16_to_cpu(endpoint->wMaxPacketSize),
+				   endpoint->bInterval);
+		} else if (ATH10K_USB_IS_ISOC_EP(endpoint->bmAttributes)) {
+			/* TODO for ISO */
+			ath10k_dbg(ar, ATH10K_DBG_USB,
+				   "usb %s isoc ep 0x%2.2x maxpktsz %d interval %d\n",
+				   ATH10K_USB_IS_DIR_IN
+				   (endpoint->bEndpointAddress) ?
+				   "rx" : "tx", endpoint->bEndpointAddress,
+				   le16_to_cpu(endpoint->wMaxPacketSize),
+				   endpoint->bInterval);
+		}
+		urbcount = 0;
+
+		pipe_num =
+		    ath10k_usb_get_logical_pipe_num(endpoint->bEndpointAddress,
+						    &urbcount);
+		if (pipe_num == ATH10K_USB_PIPE_INVALID)
+			continue;
+
+		pipe = &ar_usb->pipes[pipe_num];
+		if (pipe->ar_usb)
+			/* hmmm..pipe was already setup */
+			continue;
+
+		pipe->ar_usb = ar_usb;
+		pipe->logical_pipe_num = pipe_num;
+		pipe->ep_address = endpoint->bEndpointAddress;
+		pipe->max_packet_size = le16_to_cpu(endpoint->wMaxPacketSize);
+
+		if (ATH10K_USB_IS_BULK_EP(endpoint->bmAttributes)) {
+			if (ATH10K_USB_IS_DIR_IN(pipe->ep_address)) {
+				pipe->usb_pipe_handle =
+				    usb_rcvbulkpipe(ar_usb->udev,
+						    pipe->ep_address);
+			} else {
+				pipe->usb_pipe_handle =
+				    usb_sndbulkpipe(ar_usb->udev,
+						    pipe->ep_address);
+			}
+		} else if (ATH10K_USB_IS_INT_EP(endpoint->bmAttributes)) {
+			if (ATH10K_USB_IS_DIR_IN(pipe->ep_address)) {
+				pipe->usb_pipe_handle =
+				    usb_rcvintpipe(ar_usb->udev,
+						   pipe->ep_address);
+			} else {
+				pipe->usb_pipe_handle =
+				    usb_sndintpipe(ar_usb->udev,
+						   pipe->ep_address);
+			}
+		} else if (ATH10K_USB_IS_ISOC_EP(endpoint->bmAttributes)) {
+			/* TODO for ISO */
+			if (ATH10K_USB_IS_DIR_IN(pipe->ep_address)) {
+				pipe->usb_pipe_handle =
+				    usb_rcvisocpipe(ar_usb->udev,
+						    pipe->ep_address);
+			} else {
+				pipe->usb_pipe_handle =
+				    usb_sndisocpipe(ar_usb->udev,
+						    pipe->ep_address);
+			}
+		}
+
+		pipe->ep_desc = endpoint;
+
+		if (!ATH10K_USB_IS_DIR_IN(pipe->ep_address))
+			pipe->flags |= ATH10K_USB_PIPE_FLAG_TX;
+
+		ret = ath10k_usb_alloc_pipe_resources(ar, pipe, urbcount);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int ath10k_usb_create(struct ath10k *ar,
+			     struct usb_interface *interface)
+{
+	struct ath10k_usb *ar_usb = ath10k_usb_priv(ar);
+	struct usb_device *dev = interface_to_usbdev(interface);
+	struct ath10k_usb_pipe *pipe;
+	int ret, i;
+
+	usb_set_intfdata(interface, ar_usb);
+	spin_lock_init(&ar_usb->cs_lock);
+	ar_usb->udev = dev;
+	ar_usb->interface = interface;
+
+	for (i = 0; i < ATH10K_USB_PIPE_MAX; i++) {
+		pipe = &ar_usb->pipes[i];
+		INIT_WORK(&pipe->io_complete_work,
+			  ath10k_usb_io_comp_work);
+		skb_queue_head_init(&pipe->io_comp_queue);
+	}
+
+	ar_usb->diag_cmd_buffer = kzalloc(ATH10K_USB_MAX_DIAG_CMD, GFP_KERNEL);
+	if (!ar_usb->diag_cmd_buffer) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	ar_usb->diag_resp_buffer = kzalloc(ATH10K_USB_MAX_DIAG_RESP,
+					   GFP_KERNEL);
+	if (!ar_usb->diag_resp_buffer) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	ret = ath10k_usb_setup_pipe_resources(ar, interface);
+	if (ret)
+		goto err;
+
+	return 0;
+
+err:
+	ath10k_usb_destroy(ar);
+	return ret;
+}
+
+/* ath10k usb driver registered functions */
+static int ath10k_usb_probe(struct usb_interface *interface,
+			    const struct usb_device_id *id)
+{
+	struct ath10k *ar;
+	struct ath10k_usb *ar_usb;
+	struct usb_device *dev = interface_to_usbdev(interface);
+	int ret, vendor_id, product_id;
+	enum ath10k_hw_rev hw_rev;
+	u32 chip_id;
+
+	/* Assumption: All USB based chipsets (so far) are QCA9377 based.
+	 * If there will be newer chipsets that does not use the hw reg
+	 * setup as defined in qca6174_regs and qca6174_values, this
+	 * assumption is no longer valid and hw_rev must be setup differently
+	 * depending on chipset.
+	 */
+	hw_rev = ATH10K_HW_QCA9377;
+
+	ar = ath10k_core_create(sizeof(*ar_usb), &dev->dev, ATH10K_BUS_USB,
+				hw_rev, &ath10k_usb_hif_ops);
+	if (!ar) {
+		dev_err(&dev->dev, "failed to allocate core\n");
+		return -ENOMEM;
+	}
+
+	usb_get_dev(dev);
+	vendor_id = le16_to_cpu(dev->descriptor.idVendor);
+	product_id = le16_to_cpu(dev->descriptor.idProduct);
+
+	ath10k_dbg(ar, ATH10K_DBG_BOOT,
+		   "usb new func vendor 0x%04x product 0x%04x\n",
+		   vendor_id, product_id);
+
+	ar_usb = ath10k_usb_priv(ar);
+	ret = ath10k_usb_create(ar, interface);
+	ar_usb->ar = ar;
+
+	ar->dev_id = product_id;
+	ar->id.vendor = vendor_id;
+	ar->id.device = product_id;
+
+	/* TODO: don't know yet how to get chip_id with USB */
+	chip_id = 0;
+	ret = ath10k_core_register(ar, chip_id);
+	if (ret) {
+		ath10k_warn(ar, "failed to register driver core: %d\n", ret);
+		goto err;
+	}
+
+	/* TODO: remove this once USB support is fully implemented */
+	ath10k_warn(ar, "WARNING: ath10k USB support is incomplete, don't expect anything to work!\n");
+
+	return 0;
+
+err:
+	ath10k_core_destroy(ar);
+
+	usb_put_dev(dev);
+
+	return ret;
+}
+
+static void ath10k_usb_remove(struct usb_interface *interface)
+{
+	struct ath10k_usb *ar_usb;
+
+	ar_usb = usb_get_intfdata(interface);
+	if (!ar_usb)
+		return;
+
+	ath10k_core_unregister(ar_usb->ar);
+	ath10k_usb_destroy(ar_usb->ar);
+	usb_put_dev(interface_to_usbdev(interface));
+	ath10k_core_destroy(ar_usb->ar);
+}
+
+#ifdef CONFIG_PM
+
+static int ath10k_usb_pm_suspend(struct usb_interface *interface,
+				 pm_message_t message)
+{
+	struct ath10k_usb *ar_usb = usb_get_intfdata(interface);
+
+	ath10k_usb_flush_all(ar_usb->ar);
+	return 0;
+}
+
+static int ath10k_usb_pm_resume(struct usb_interface *interface)
+{
+	struct ath10k_usb *ar_usb = usb_get_intfdata(interface);
+	struct ath10k *ar = ar_usb->ar;
+
+	ath10k_usb_post_recv_transfers(ar,
+				       &ar_usb->pipes[ATH10K_USB_PIPE_RX_DATA]);
+
+	return 0;
+}
+
+#else
+
+#define ath10k_usb_pm_suspend NULL
+#define ath10k_usb_pm_resume NULL
+
+#endif
+
+/* table of devices that work with this driver */
+static struct usb_device_id ath10k_usb_ids[] = {
+	{USB_DEVICE(0x13b1, 0x0042)}, /* Linksys WUSB6100M */
+	{ /* Terminating entry */ },
+};
+
+MODULE_DEVICE_TABLE(usb, ath10k_usb_ids);
+
+static struct usb_driver ath10k_usb_driver = {
+	.name = "ath10k_usb",
+	.probe = ath10k_usb_probe,
+	.suspend = ath10k_usb_pm_suspend,
+	.resume = ath10k_usb_pm_resume,
+	.disconnect = ath10k_usb_remove,
+	.id_table = ath10k_usb_ids,
+	.supports_autosuspend = true,
+#if LINUX_VERSION_IS_GEQ(3,5,0)
+	.disable_hub_initiated_lpm = 1,
+#endif
+};
+
+module_usb_driver(ath10k_usb_driver);
+
+MODULE_AUTHOR("Atheros Communications, Inc.");
+MODULE_DESCRIPTION("Driver support for Qualcomm Atheros 802.11ac WLAN USB devices");
+MODULE_LICENSE("Dual BSD/GPL");