path: root/drivers/net/wireless/mwifiex/usb.c

/*
 * Marvell Wireless LAN device driver: USB specific handling
 *
 * Copyright (C) 2012, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "main.h"
#include "usb.h"

#define USB_VERSION	"1.0"

static const char usbdriver_name[] = "usb8797";

static struct mwifiex_if_ops usb_ops;
static struct semaphore add_remove_card_sem;
static struct usb_card_rec *usb_card;

static struct usb_device_id mwifiex_usb_table[] = {
	{USB_DEVICE(USB8797_VID, USB8797_PID_1)},
	{USB_DEVICE_AND_INTERFACE_INFO(USB8797_VID, USB8797_PID_2,
				       USB_CLASS_VENDOR_SPEC,
				       USB_SUBCLASS_VENDOR_SPEC, 0xff)},
	{ }	/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, mwifiex_usb_table);

static int mwifiex_usb_submit_rx_urb(struct urb_context *ctx, int size);

/* This function handles received packet. Necessary action is taken based on
 * cmd/event/data.
 */
static int mwifiex_usb_recv(struct mwifiex_adapter *adapter,
			    struct sk_buff *skb, u8 ep)
{
	struct device *dev = adapter->dev;
	u32 recv_type;
	__le32 tmp;
	int ret;

	if (adapter->hs_activated)
		mwifiex_process_hs_config(adapter);

	if (skb->len < INTF_HEADER_LEN) {
		dev_err(dev, "%s: invalid skb->len\n", __func__);
		return -1;
	}

	switch (ep) {
	case MWIFIEX_USB_EP_CMD_EVENT:
		dev_dbg(dev, "%s: EP_CMD_EVENT\n", __func__);
		skb_copy_from_linear_data(skb, &tmp, INTF_HEADER_LEN);
		recv_type = le32_to_cpu(tmp);
		skb_pull(skb, INTF_HEADER_LEN);

		switch (recv_type) {
		case MWIFIEX_USB_TYPE_CMD:
			if (skb->len > MWIFIEX_SIZE_OF_CMD_BUFFER) {
				dev_err(dev, "CMD: skb->len too large\n");
				ret = -1;
				goto exit_restore_skb;
			} else if (!adapter->curr_cmd) {
				dev_dbg(dev, "CMD: no curr_cmd\n");
				if (adapter->ps_state == PS_STATE_SLEEP_CFM) {
					mwifiex_process_sleep_confirm_resp(
							adapter, skb->data,
							skb->len);
					ret = 0;
					goto exit_restore_skb;
				}
				ret = -1;
				goto exit_restore_skb;
			}

			adapter->curr_cmd->resp_skb = skb;
			adapter->cmd_resp_received = true;
			break;
		case MWIFIEX_USB_TYPE_EVENT:
			if (skb->len < sizeof(u32)) {
				dev_err(dev, "EVENT: skb->len too small\n");
				ret = -1;
				goto exit_restore_skb;
			}
			skb_copy_from_linear_data(skb, &tmp, sizeof(u32));
			adapter->event_cause = le32_to_cpu(tmp);
			dev_dbg(dev, "event_cause %#x\n", adapter->event_cause);

			if (skb->len > MAX_EVENT_SIZE) {
				dev_err(dev, "EVENT: event body too large\n");
				ret = -1;
				goto exit_restore_skb;
			}

			memcpy(adapter->event_body, skb->data +
			       MWIFIEX_EVENT_HEADER_LEN, skb->len);

			adapter->event_received = true;
			adapter->event_skb = skb;
			break;
		default:
			dev_err(dev, "unknown recv_type %#x\n", recv_type);
			return -1;
		}
		break;
	case MWIFIEX_USB_EP_DATA:
		dev_dbg(dev, "%s: EP_DATA\n", __func__);
		if (skb->len > MWIFIEX_RX_DATA_BUF_SIZE) {
			dev_err(dev, "DATA: skb->len too large\n");
			return -1;
		}
		skb_queue_tail(&adapter->usb_rx_data_q, skb);
		adapter->data_received = true;
		break;
	default:
		dev_err(dev, "%s: unknown endport %#x\n", __func__, ep);
		return -1;
	}

	return -EINPROGRESS;