if_usb.c

linux内核源码

/**
  * This file contains functions used in USB interface module.
  */
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/firmware.h>
#include <linux/netdevice.h>
#include <linux/list.h>
#include <linux/usb.h>

#define DRV_NAME "usb8xxx"

#include "host.h"
#include "decl.h"
#include "defs.h"
#include "dev.h"
#include "if_usb.h"

#define MESSAGE_HEADER_LEN	4

static const char usbdriver_name[] = "usb8xxx";
static u8 *default_fw_name = "usb8388.bin";

static char *libertas_fw_name = NULL;
module_param_named(fw_name, libertas_fw_name, charp, 0644);

/*
 * We need to send a RESET command to all USB devices before
 * we tear down the USB connection. Otherwise we would not
 * be able to re-init device the device if the module gets
 * loaded again. This is a list of all initialized USB devices,
 * for the reset code see if_usb_reset_device()
*/
static LIST_HEAD(usb_devices);

static struct usb_device_id if_usb_table[] = {
	/* Enter the device signature inside */
	{ USB_DEVICE(0x1286, 0x2001) },
	{ USB_DEVICE(0x05a3, 0x8388) },
	{}	/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, if_usb_table);

static void if_usb_receive(struct urb *urb);
static void if_usb_receive_fwload(struct urb *urb);
static int if_usb_prog_firmware(struct usb_card_rec *cardp);
static int if_usb_host_to_card(wlan_private * priv, u8 type, u8 * payload, u16 nb);
static int if_usb_get_int_status(wlan_private * priv, u8 *);
static int if_usb_read_event_cause(wlan_private *);
static int usb_tx_block(struct usb_card_rec *cardp, u8 *payload, u16 nb);
static void if_usb_free(struct usb_card_rec *cardp);
static int if_usb_submit_rx_urb(struct usb_card_rec *cardp);
static int if_usb_reset_device(struct usb_card_rec *cardp);

/**
 *  @brief  call back function to handle the status of the URB
 *  @param urb 		pointer to urb structure
 *  @return 	   	N/A
 */
static void if_usb_write_bulk_callback(struct urb *urb)
{
	struct usb_card_rec *cardp = (struct usb_card_rec *) urb->context;

	/* handle the transmission complete validations */

	if (urb->status == 0) {
		wlan_private *priv = cardp->priv;

		/*
		lbs_deb_usbd(&urb->dev->dev, "URB status is successfull\n");
		lbs_deb_usbd(&urb->dev->dev, "Actual length transmitted %d\n",
		       urb->actual_length);
		*/

		/* Used for both firmware TX and regular TX.  priv isn't
		 * valid at firmware load time.
		 */
		if (priv) {
			wlan_adapter *adapter = priv->adapter;
			struct net_device *dev = priv->dev;

			priv->dnld_sent = DNLD_RES_RECEIVED;

			/* Wake main thread if commands are pending */
			if (!adapter->cur_cmd)
				wake_up_interruptible(&priv->waitq);

			if ((adapter->connect_status == LIBERTAS_CONNECTED)) {
				netif_wake_queue(dev);
				netif_wake_queue(priv->mesh_dev);
			}
		}
	} else {
		/* print the failure status number for debug */
		lbs_pr_info("URB in failure status: %d\n", urb->status);
	}

	return;
}

/**
 *  @brief  free tx/rx urb, skb and rx buffer
 *  @param cardp	pointer usb_card_rec
 *  @return 	   	N/A
 */
static void if_usb_free(struct usb_card_rec *cardp)
{
	lbs_deb_enter(LBS_DEB_USB);

	/* Unlink tx & rx urb */
	usb_kill_urb(cardp->tx_urb);
	usb_kill_urb(cardp->rx_urb);

	usb_free_urb(cardp->tx_urb);
	cardp->tx_urb = NULL;

	usb_free_urb(cardp->rx_urb);
	cardp->rx_urb = NULL;

	kfree(cardp->bulk_out_buffer);
	cardp->bulk_out_buffer = NULL;

	lbs_deb_leave(LBS_DEB_USB);
}

/**
 *  @brief sets the configuration values
 *  @param ifnum	interface number
 *  @param id		pointer to usb_device_id
 *  @return 	   	0 on success, error code on failure
 */
static int if_usb_probe(struct usb_interface *intf,
			const struct usb_device_id *id)
{
	struct usb_device *udev;
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	wlan_private *priv;
	struct usb_card_rec *cardp;
	int i;

	udev = interface_to_usbdev(intf);

	cardp = kzalloc(sizeof(struct usb_card_rec), GFP_KERNEL);
	if (!cardp) {
		lbs_pr_err("Out of memory allocating private data.\n");
		goto error;
	}

	cardp->udev = udev;
	iface_desc = intf->cur_altsetting;

	lbs_deb_usbd(&udev->dev, "bcdUSB = 0x%X bDeviceClass = 0x%X"
	       " bDeviceSubClass = 0x%X, bDeviceProtocol = 0x%X\n",
		     le16_to_cpu(udev->descriptor.bcdUSB),
		     udev->descriptor.bDeviceClass,
		     udev->descriptor.bDeviceSubClass,
		     udev->descriptor.bDeviceProtocol);

	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;
		if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
		    && ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
			USB_ENDPOINT_XFER_BULK)) {
			/* we found a bulk in endpoint */
			lbs_deb_usbd(&udev->dev, "Bulk in size is %d\n",
				     le16_to_cpu(endpoint->wMaxPacketSize));
			if (!(cardp->rx_urb = usb_alloc_urb(0, GFP_KERNEL))) {
				lbs_deb_usbd(&udev->dev,
				       "Rx URB allocation failed\n");
				goto dealloc;
			}
			cardp->rx_urb_recall = 0;

			cardp->bulk_in_size =
				le16_to_cpu(endpoint->wMaxPacketSize);
			cardp->bulk_in_endpointAddr =
			    (endpoint->
			     bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
			lbs_deb_usbd(&udev->dev, "in_endpoint = %d\n",
			       endpoint->bEndpointAddress);
		}

		if (((endpoint->
		      bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
		     USB_DIR_OUT)
		    && ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
			USB_ENDPOINT_XFER_BULK)) {
			/* We found bulk out endpoint */
			if (!(cardp->tx_urb = usb_alloc_urb(0, GFP_KERNEL))) {
				lbs_deb_usbd(&udev->dev,
				       "Tx URB allocation failed\n");
				goto dealloc;
			}

			cardp->bulk_out_size =
				le16_to_cpu(endpoint->wMaxPacketSize);
			lbs_deb_usbd(&udev->dev,
				     "Bulk out size is %d\n",
				     le16_to_cpu(endpoint->wMaxPacketSize));
			cardp->bulk_out_endpointAddr =
			    endpoint->bEndpointAddress;
			lbs_deb_usbd(&udev->dev, "out_endpoint = %d\n",
				    endpoint->bEndpointAddress);
			cardp->bulk_out_buffer =
			    kmalloc(MRVDRV_ETH_TX_PACKET_BUFFER_SIZE,
				    GFP_KERNEL);

			if (!cardp->bulk_out_buffer) {
				lbs_deb_usbd(&udev->dev,
				       "Could not allocate buffer\n");
				goto dealloc;
			}
		}
	}

	/* Upload firmware */
	cardp->rinfo.cardp = cardp;
	if (if_usb_prog_firmware(cardp)) {
		lbs_deb_usbd(&udev->dev, "FW upload failed");
		goto err_prog_firmware;
	}

	if (!(priv = libertas_add_card(cardp, &udev->dev)))
		goto err_prog_firmware;

	cardp->priv = priv;

	if (libertas_add_mesh(priv, &udev->dev))
		goto err_add_mesh;

	cardp->eth_dev = priv->dev;

	priv->hw_host_to_card = if_usb_host_to_card;
	priv->hw_get_int_status = if_usb_get_int_status;
	priv->hw_read_event_cause = if_usb_read_event_cause;
	priv->boot2_version = udev->descriptor.bcdDevice;

	/* Delay 200 ms to waiting for the FW ready */
	if_usb_submit_rx_urb(cardp);
	msleep_interruptible(200);
	priv->adapter->fw_ready = 1;

	if (libertas_start_card(priv))
		goto err_start_card;

	list_add_tail(&cardp->list, &usb_devices);

	usb_get_dev(udev);
	usb_set_intfdata(intf, cardp);

	return 0;

err_start_card:
	libertas_remove_mesh(priv);
err_add_mesh:
	libertas_remove_card(priv);
err_prog_firmware:
	if_usb_reset_device(cardp);
dealloc:
	if_usb_free(cardp);

error:
	return -ENOMEM;
}

/**
 *  @brief free resource and cleanup
 *  @param intf		USB interface structure
 *  @return 	   	N/A
 */
static void if_usb_disconnect(struct usb_interface *intf)
{
	struct usb_card_rec *cardp = usb_get_intfdata(intf);
	wlan_private *priv = (wlan_private *) cardp->priv;

	lbs_deb_enter(LBS_DEB_MAIN);

	/* Update Surprise removed to TRUE */
	cardp->surprise_removed = 1;

	list_del(&cardp->list);

	if (priv) {
		wlan_adapter *adapter = priv->adapter;

		adapter->surpriseremoved = 1;
		libertas_stop_card(priv);
		libertas_remove_mesh(priv);
		libertas_remove_card(priv);
	}

	/* Unlink and free urb */
	if_usb_free(cardp);

	usb_set_intfdata(intf, NULL);
	usb_put_dev(interface_to_usbdev(intf));

	lbs_deb_leave(LBS_DEB_MAIN);
}

/**
 *  @brief  This function download FW
 *  @param priv		pointer to wlan_private
 *  @return 	   	0
 */
static int if_prog_firmware(struct usb_card_rec *cardp)
{
	struct FWData *fwdata;
	struct fwheader *fwheader;
	u8 *firmware = cardp->fw->data;

	fwdata = kmalloc(sizeof(struct FWData), GFP_ATOMIC);

	if (!fwdata)
		return -1;

	fwheader = &fwdata->fwheader;

	if (!cardp->CRC_OK) {
		cardp->totalbytes = cardp->fwlastblksent;
		cardp->fwseqnum = cardp->lastseqnum - 1;
	}

	/*
	lbs_deb_usbd(&cardp->udev->dev, "totalbytes = %d\n",
		    cardp->totalbytes);
	*/

	memcpy(fwheader, &firmware[cardp->totalbytes],
	       sizeof(struct fwheader));

	cardp->fwlastblksent = cardp->totalbytes;
	cardp->totalbytes += sizeof(struct fwheader);

	/* lbs_deb_usbd(&cardp->udev->dev,"Copy Data\n"); */
	memcpy(fwdata->data, &firmware[cardp->totalbytes],
	       le32_to_cpu(fwdata->fwheader.datalength));

	/*
	lbs_deb_usbd(&cardp->udev->dev,
		    "Data length = %d\n", le32_to_cpu(fwdata->fwheader.datalength));
	*/

	cardp->fwseqnum = cardp->fwseqnum + 1;

	fwdata->seqnum = cpu_to_le32(cardp->fwseqnum);
	cardp->lastseqnum = cardp->fwseqnum;
	cardp->totalbytes += le32_to_cpu(fwdata->fwheader.datalength);

	if (fwheader->dnldcmd == cpu_to_le32(FW_HAS_DATA_TO_RECV)) {
		/*
		lbs_deb_usbd(&cardp->udev->dev, "There are data to follow\n");
		lbs_deb_usbd(&cardp->udev->dev,
			    "seqnum = %d totalbytes = %d\n", cardp->fwseqnum,
			    cardp->totalbytes);
		*/
		memcpy(cardp->bulk_out_buffer, fwheader, FW_DATA_XMIT_SIZE);
		usb_tx_block(cardp, cardp->bulk_out_buffer, FW_DATA_XMIT_SIZE);

	} else if (fwdata->fwheader.dnldcmd == cpu_to_le32(FW_HAS_LAST_BLOCK)) {
		/*
		lbs_deb_usbd(&cardp->udev->dev,
			    "Host has finished FW downloading\n");
		lbs_deb_usbd(&cardp->udev->dev,
			    "Donwloading FW JUMP BLOCK\n");
		*/
		memcpy(cardp->bulk_out_buffer, fwheader, FW_DATA_XMIT_SIZE);
		usb_tx_block(cardp, cardp->bulk_out_buffer, FW_DATA_XMIT_SIZE);
		cardp->fwfinalblk = 1;
	}

	/*
	lbs_deb_usbd(&cardp->udev->dev,
		    "The firmware download is done size is %d\n",
		    cardp->totalbytes);
	*/

	kfree(fwdata);

	return 0;
}

static int if_usb_reset_device(struct usb_card_rec *cardp)
{
	int ret;
	wlan_private * priv = cardp->priv;

	lbs_deb_enter(LBS_DEB_USB);

	/* Try a USB port reset first, if that fails send the reset
	 * command to the firmware.
	 */
	ret = usb_reset_device(cardp->udev);
	if (!ret && priv) {
		msleep(10);
		ret = libertas_reset_device(priv);
		msleep(10);
	}

	lbs_deb_leave_args(LBS_DEB_USB, "ret %d", ret);

	return ret;
}

/**
 *  @brief This function transfer the data to the device.
 *  @param priv 	pointer to wlan_private
 *  @param payload	pointer to payload data
 *  @param nb		data length
 *  @return 	   	0 or -1
 */
static int usb_tx_block(struct usb_card_rec *cardp, u8 * payload, u16 nb)
{
	int ret = -1;

	/* check if device is removed */
	if (cardp->surprise_removed) {
		lbs_deb_usbd(&cardp->udev->dev, "Device removed\n");
		goto tx_ret;
	}

	usb_fill_bulk_urb(cardp->tx_urb, cardp->udev,
			  usb_sndbulkpipe(cardp->udev,
					  cardp->bulk_out_endpointAddr),
			  payload, nb, if_usb_write_bulk_callback, cardp);

	cardp->tx_urb->transfer_flags |= URB_ZERO_PACKET;

	if ((ret = usb_submit_urb(cardp->tx_urb, GFP_ATOMIC))) {
		/*  transfer failed */
		lbs_deb_usbd(&cardp->udev->dev, "usb_submit_urb failed\n");
		ret = -1;
	} else {
		/* lbs_deb_usbd(&cardp->udev->dev, "usb_submit_urb success\n"); */
		ret = 0;
	}

tx_ret:
	return ret;
}

static int __if_usb_submit_rx_urb(struct usb_card_rec *cardp,
				  void (*callbackfn)(struct urb *urb))
{
	struct sk_buff *skb;
	struct read_cb_info *rinfo = &cardp->rinfo;
	int ret = -1;

	if (!(skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE))) {
		lbs_pr_err("No free skb\n");
		goto rx_ret;
	}

	rinfo->skb = skb;

	/* Fill the receive configuration URB and initialise the Rx call back */
	usb_fill_bulk_urb(cardp->rx_urb, cardp->udev,
			  usb_rcvbulkpipe(cardp->udev,
					  cardp->bulk_in_endpointAddr),
			  (void *) (skb->tail + (size_t) IPFIELD_ALIGN_OFFSET),
			  MRVDRV_ETH_RX_PACKET_BUFFER_SIZE, callbackfn,
			  rinfo);

	cardp->rx_urb->transfer_flags |= URB_ZERO_PACKET;

	/* lbs_deb_usbd(&cardp->udev->dev, "Pointer for rx_urb %p\n", cardp->rx_urb); */
	if ((ret = usb_submit_urb(cardp->rx_urb, GFP_ATOMIC))) {
		/* handle failure conditions */
		lbs_deb_usbd(&cardp->udev->dev, "Submit Rx URB failed\n");
		ret = -1;
	} else {
		/* lbs_deb_usbd(&cardp->udev->dev, "Submit Rx URB success\n"); */
		ret = 0;
	}

rx_ret:
	return ret;
}

static int if_usb_submit_rx_urb_fwload(struct usb_card_rec *cardp)
{
	return __if_usb_submit_rx_urb(cardp, &if_usb_receive_fwload);
}

static int if_usb_submit_rx_urb(struct usb_card_rec *cardp)
{
	return __if_usb_submit_rx_urb(cardp, &if_usb_receive);
}

static void if_usb_receive_fwload(struct urb *urb)
{
	struct read_cb_info *rinfo = (struct read_cb_info *)urb->context;
	struct sk_buff *skb = rinfo->skb;
	struct usb_card_rec *cardp = (struct usb_card_rec *)rinfo->cardp;
	struct fwsyncheader *syncfwheader;
	struct bootcmdrespStr bootcmdresp;

	if (urb->status) {
		lbs_deb_usbd(&cardp->udev->dev,
			    "URB status is failed during fw load\n");
		kfree_skb(skb);
		return;
	}

	if (cardp->bootcmdresp == 0) {
		memcpy (&bootcmdresp, skb->data + IPFIELD_ALIGN_OFFSET,
			sizeof(bootcmdresp));
		if (le16_to_cpu(cardp->udev->descriptor.bcdDevice) < 0x3106) {
			kfree_skb(skb);
			if_usb_submit_rx_urb_fwload(cardp);
			cardp->bootcmdresp = 1;
			lbs_deb_usbd(&cardp->udev->dev,
				    "Received valid boot command response\n");
			return;
		}
		if (bootcmdresp.u32magicnumber != cpu_to_le32(BOOT_CMD_MAGIC_NUMBER)) {
			lbs_pr_info(
				"boot cmd response wrong magic number (0x%x)\n",
				le32_to_cpu(bootcmdresp.u32magicnumber));
		} else if (bootcmdresp.u8cmd_tag != BOOT_CMD_FW_BY_USB) {
			lbs_pr_info(
				"boot cmd response cmd_tag error (%d)\n",
				bootcmdresp.u8cmd_tag);
		} else if (bootcmdresp.u8result != BOOT_CMD_RESP_OK) {
			lbs_pr_info(
				"boot cmd response result error (%d)\n",
				bootcmdresp.u8result);
		} else {
			cardp->bootcmdresp = 1;
			lbs_deb_usbd(&cardp->udev->dev,