kaweth.c

linux2.4.20下的针对三星公司的s3c2410的usb模块驱动代码

	}
	else {
		kaweth_dbg("Set Rx mode to %d", packet_filter_bitmap);
	}
	}
}

/****************************************************************
 *     kaweth_netdev_stats
 ****************************************************************/
static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
{
	return &((struct kaweth_device *)dev->priv)->stats;
}

/****************************************************************
 *     kaweth_tx_timeout
 ****************************************************************/
static void kaweth_tx_timeout(struct net_device *net)
{
	struct kaweth_device *kaweth = net->priv;

	kaweth_warn("%s: Tx timed out. Resetting.", net->name);
	kaweth->stats.tx_errors++;
	net->trans_start = jiffies;

	usb_unlink_urb(kaweth->tx_urb);
}

/****************************************************************
 *     kaweth_probe
 ****************************************************************/
static void *kaweth_probe(
            struct usb_device *dev,             /* the device */
            unsigned ifnum,                      /* what interface */
            const struct usb_device_id *id      /* from id_table */
	)
{
	struct kaweth_device *kaweth;
	const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
	int result = 0;

	kaweth_dbg("Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x",
		 dev->devnum,
		 (int)dev->descriptor.idVendor,
		 (int)dev->descriptor.idProduct,
		 (int)dev->descriptor.bcdDevice);

	kaweth_dbg("Device at %p", dev);

	kaweth_dbg("Descriptor length: %x type: %x",
		 (int)dev->descriptor.bLength,
		 (int)dev->descriptor.bDescriptorType);

	if(!(kaweth = kmalloc(sizeof(struct kaweth_device), GFP_KERNEL))) {
		kaweth_dbg("out of memory allocating device structure\n");
		return NULL;
	}

	memset(kaweth, 0, sizeof(struct kaweth_device));

	kaweth->dev = dev;
	spin_lock_init(&kaweth->device_lock);
	init_waitqueue_head(&kaweth->term_wait);

	kaweth_dbg("Resetting.");

	kaweth_reset(kaweth);

	/*
	 * If high byte of bcdDevice is nonzero, firmware is already
	 * downloaded. Don't try to do it again, or we'll hang the device.
	 */

	if (dev->descriptor.bcdDevice >> 8) {
		kaweth_info("Firmware present in device.");
	} else {
		/* Download the firmware */
		kaweth_info("Downloading firmware...");
		kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
		if ((result = kaweth_download_firmware(kaweth,
						      kaweth_new_code,
						      len_kaweth_new_code,
						      100,
						      2)) < 0) {
			kaweth_err("Error downloading firmware (%d)", result);
			free_page((unsigned long)kaweth->firmware_buf);
			kfree(kaweth);
			return NULL;
		}

		if ((result = kaweth_download_firmware(kaweth,
						      kaweth_new_code_fix,
						      len_kaweth_new_code_fix,
						      100,
						      3)) < 0) {
			kaweth_err("Error downloading firmware fix (%d)", result);
			free_page((unsigned long)kaweth->firmware_buf);
			kfree(kaweth);
			return NULL;
		}

		if ((result = kaweth_download_firmware(kaweth,
						      kaweth_trigger_code,
						      len_kaweth_trigger_code,
						      126,
						      2)) < 0) {
			kaweth_err("Error downloading trigger code (%d)", result);
			free_page((unsigned long)kaweth->firmware_buf);
			kfree(kaweth);
			return NULL;
		}

		if ((result = kaweth_download_firmware(kaweth,
						      kaweth_trigger_code_fix,
						      len_kaweth_trigger_code_fix,
						      126,
						      3)) < 0) {
			kaweth_err("Error downloading trigger code fix (%d)", result);
			free_page((unsigned long)kaweth->firmware_buf);
			kfree(kaweth);
			return NULL;
		}


		if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
			kaweth_err("Error triggering firmware (%d)", result);
			free_page((unsigned long)kaweth->firmware_buf);
			kfree(kaweth);
			return NULL;
		}

		/* Device will now disappear for a moment...  */
		kaweth_info("Firmware loaded.  I'll be back...");
		free_page((unsigned long)kaweth->firmware_buf);
		kfree(kaweth);
		return NULL;
	}

	result = kaweth_read_configuration(kaweth);

	if(result < 0) {
		kaweth_err("Error reading configuration (%d), no net device created", result);
		kfree(kaweth);
		return NULL;
	}

	kaweth_info("Statistics collection: %x", kaweth->configuration.statistics_mask);
	kaweth_info("Multicast filter limit: %x", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
	kaweth_info("MTU: %d", le16_to_cpu(kaweth->configuration.segment_size));
	kaweth_info("Read MAC address %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
		 (int)kaweth->configuration.hw_addr[0],
		 (int)kaweth->configuration.hw_addr[1],
		 (int)kaweth->configuration.hw_addr[2],
		 (int)kaweth->configuration.hw_addr[3],
		 (int)kaweth->configuration.hw_addr[4],
		 (int)kaweth->configuration.hw_addr[5]);

	if(!memcmp(&kaweth->configuration.hw_addr,
                   &bcast_addr,
		   sizeof(bcast_addr))) {
		kaweth_err("Firmware not functioning properly, no net device created");
		kfree(kaweth);
		return NULL;
	}

	if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
		kaweth_dbg("Error setting URB size");
		return kaweth;
	}

	if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
		kaweth_err("Error setting SOFS wait");
		return kaweth;
	}

	result = kaweth_set_receive_filter(kaweth,
                                           KAWETH_PACKET_FILTER_DIRECTED |
                                           KAWETH_PACKET_FILTER_BROADCAST |
                                           KAWETH_PACKET_FILTER_MULTICAST);

	if(result < 0) {
		kaweth_err("Error setting receive filter");
		return kaweth;
	}

	kaweth_dbg("Initializing net device.");

	kaweth->tx_urb = usb_alloc_urb(0);
	if (!kaweth->tx_urb)
		goto err_no_urb;
	kaweth->rx_urb = usb_alloc_urb(0);
	if (!kaweth->rx_urb)
		goto err_only_tx;
	kaweth->irq_urb = usb_alloc_urb(0);
	if (!kaweth->irq_urb)
		goto err_tx_and_rx;

	kaweth->net = init_etherdev(0, 0);
	if (!kaweth->net) {
		kaweth_err("Error calling init_etherdev.");
		return kaweth;
	}

	memcpy(kaweth->net->broadcast, &bcast_addr, sizeof(bcast_addr));
	memcpy(kaweth->net->dev_addr,
               &kaweth->configuration.hw_addr,
               sizeof(kaweth->configuration.hw_addr));

	kaweth->net->priv = kaweth;
	kaweth->net->open = kaweth_open;
	kaweth->net->stop = kaweth_close;

	kaweth->net->watchdog_timeo = KAWETH_TX_TIMEOUT;
	kaweth->net->tx_timeout = kaweth_tx_timeout;

	kaweth->net->do_ioctl = kaweth_ioctl;
	kaweth->net->hard_start_xmit = kaweth_start_xmit;
	kaweth->net->set_multicast_list = kaweth_set_rx_mode;
	kaweth->net->get_stats = kaweth_netdev_stats;
	kaweth->net->mtu = le16_to_cpu(kaweth->configuration.segment_size);

	memset(&kaweth->stats, 0, sizeof(kaweth->stats));

	kaweth_info("kaweth interface created at %s", kaweth->net->name);

	kaweth_dbg("Kaweth probe returning.");

	return kaweth;

err_tx_and_rx:
	usb_free_urb(kaweth->rx_urb);
err_only_tx:
	usb_free_urb(kaweth->tx_urb);
err_no_urb:
	kfree(kaweth);
	return NULL;
}

/****************************************************************
 *     kaweth_disconnect
 ****************************************************************/
static void kaweth_disconnect(struct usb_device *dev, void *ptr)
{
	struct kaweth_device *kaweth = ptr;

	kaweth_info("Unregistering");

	if (!kaweth) {
		kaweth_warn("unregistering non-existant device");
		return;
	}

	kaweth->removed = 1;
	usb_unlink_urb(kaweth->irq_urb);
	usb_unlink_urb(kaweth->rx_urb);

	/* we need to wait for the urb to be cancelled, if it is active */
	spin_lock_irq(&kaweth->device_lock);
	if (usb_unlink_urb(kaweth->tx_urb) == -EINPROGRESS) {
		spin_unlock_irq(&kaweth->device_lock);
		wait_event(kaweth->term_wait, kaweth->end);
	} else {
		spin_unlock_irq(&kaweth->device_lock);
	}

	if(kaweth->net) {
		if(kaweth->net->flags & IFF_UP) {
			kaweth_dbg("Closing net device");
			dev_close(kaweth->net);
		}

		kaweth_dbg("Unregistering net device");
		unregister_netdev(kaweth->net);
	}

	usb_free_urb(kaweth->rx_urb);
	usb_free_urb(kaweth->tx_urb);

	kfree(kaweth);
}


// FIXME this completion stuff is a modified clone of
// an OLD version of some stuff in usb.c ...
struct kw_api_data {
	wait_queue_head_t wqh;
	int done;
};

/*-------------------------------------------------------------------*
 * completion handler for compatibility wrappers (sync control/bulk) *
 *-------------------------------------------------------------------*/
static void usb_api_blocking_completion(struct urb *urb)
{
        struct kw_api_data *awd = (struct kw_api_data *)urb->context;

	awd->done=1;
	wake_up(&awd->wqh);
}

/*-------------------------------------------------------------------*
 *                         COMPATIBILITY STUFF                       *
 *-------------------------------------------------------------------*/

// Starts urb and waits for completion or timeout
static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
{
        DECLARE_WAITQUEUE(wait, current);
	struct kw_api_data awd;
        int status;

        init_waitqueue_head(&awd.wqh);
        awd.done = 0;

        set_current_state(TASK_INTERRUPTIBLE);
        add_wait_queue(&awd.wqh, &wait);
        urb->context = &awd;
        status = usb_submit_urb(urb);
        if (status) {
                // something went wrong
                usb_free_urb(urb);
                set_current_state(TASK_RUNNING);
                remove_wait_queue(&awd.wqh, &wait);
                return status;
        }

	while (timeout && !awd.done)
		timeout = schedule_timeout(timeout);

        set_current_state(TASK_RUNNING);
        remove_wait_queue(&awd.wqh, &wait);

        if (!timeout) {
                // timeout
                kaweth_warn("usb_control/bulk_msg: timeout");
                usb_unlink_urb(urb);  // remove urb safely
                status = -ETIMEDOUT;
        }
	else {
                status = urb->status;
	}

        if (actual_length) {
                *actual_length = urb->actual_length;
	}

        usb_free_urb(urb);
        return status;
}

/*-------------------------------------------------------------------*/
// returns status (negative) or length (positive)
int kaweth_internal_control_msg(struct usb_device *usb_dev, unsigned int pipe,
                            struct usb_ctrlrequest *cmd, void *data, int len,
			    int timeout)
{
        struct urb *urb;
        int retv;
        int length;

        urb = usb_alloc_urb(0);
        if (!urb)
                return -ENOMEM;

        FILL_CONTROL_URB(urb, usb_dev, pipe, (unsigned char*)cmd, data,
			 len, (usb_complete_t)usb_api_blocking_completion,0);

        retv = usb_start_wait_urb(urb, timeout, &length);
        if (retv < 0) {
                return retv;
	}
        else {
                return length;
	}
}


/****************************************************************
 *     kaweth_init
 ****************************************************************/
int __init kaweth_init(void)
{
	kaweth_dbg("Driver loading");
	return usb_register(&kaweth_driver);
}

/****************************************************************
 *     kaweth_exit
 ****************************************************************/
void __exit kaweth_exit(void)
{
	usb_deregister(&kaweth_driver);
}

module_init(kaweth_init);
module_exit(kaweth_exit);