serial.c

ARM S3C2410 USB SLAVE LINUX驱动

	ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
	if (!ep)
		goto autoconf_fail;
	EP_IN_NAME = ep->name;
	ep->driver_data = ep;	/* claim the endpoint */

	ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
	if (!ep)
		goto autoconf_fail;
	EP_OUT_NAME = ep->name;
	ep->driver_data = ep;	/* claim the endpoint */

	if (use_acm) {
		ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
		if (!ep) {
			printk(KERN_ERR "gs_bind: cannot run ACM on %s\n", gadget->name);
			goto autoconf_fail;
		}
		gs_device_desc.idProduct = __constant_cpu_to_le16(
						GS_CDC_PRODUCT_ID),
		EP_NOTIFY_NAME = ep->name;
		ep->driver_data = ep;	/* claim the endpoint */
	}

	gs_device_desc.bDeviceClass = use_acm
		? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
	gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;

#ifdef CONFIG_USB_GADGET_DUALSPEED
	gs_qualifier_desc.bDeviceClass = use_acm
		? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
	/* assume ep0 uses the same packet size for both speeds */
	gs_qualifier_desc.bMaxPacketSize0 = gs_device_desc.bMaxPacketSize0;
	/* assume endpoints are dual-speed */
	gs_highspeed_notify_desc.bEndpointAddress =
		gs_fullspeed_notify_desc.bEndpointAddress;
	gs_highspeed_in_desc.bEndpointAddress =
		gs_fullspeed_in_desc.bEndpointAddress;
	gs_highspeed_out_desc.bEndpointAddress =
		gs_fullspeed_out_desc.bEndpointAddress;
#endif /* CONFIG_USB_GADGET_DUALSPEED */

	usb_gadget_set_selfpowered(gadget);

	if (gadget->is_otg) {
		gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
		gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
		gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
	}

	gs_device = dev = kmalloc(sizeof(struct gs_dev), GFP_KERNEL);
	if (dev == NULL)
		return -ENOMEM;

	snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
		system_utsname.sysname, system_utsname.release,
		gadget->name);

	memset(dev, 0, sizeof(struct gs_dev));
	dev->dev_gadget = gadget;
	spin_lock_init(&dev->dev_lock);
	INIT_LIST_HEAD(&dev->dev_req_list);
	set_gadget_data(gadget, dev);

	if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
		printk(KERN_ERR "gs_bind: cannot allocate ports\n");
		gs_unbind(gadget);
		return ret;
	}

	/* preallocate control response and buffer */
	dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
		GFP_KERNEL);
	if (dev->dev_ctrl_req == NULL) {
		gs_unbind(gadget);
		return -ENOMEM;
	}
	dev->dev_ctrl_req->complete = gs_setup_complete;

	gadget->ep0->driver_data = dev;

	printk(KERN_INFO "gs_bind: %s %s bound\n",
		GS_LONG_NAME, GS_VERSION_STR);

	return 0;

autoconf_fail:
	printk(KERN_ERR "gs_bind: cannot autoconfigure on %s\n", gadget->name);
	return -ENODEV;
}

/*
 * gs_unbind
 *
 * Called on module unload.  Frees the control request and device
 * structure.
 */
static void gs_unbind(struct usb_gadget *gadget)
{
	struct gs_dev *dev = get_gadget_data(gadget);

	gs_device = NULL;

	/* read/write requests already freed, only control request remains */
	if (dev != NULL) {
		if (dev->dev_ctrl_req != NULL) {
			gs_free_req(gadget->ep0, dev->dev_ctrl_req);
			dev->dev_ctrl_req = NULL;
		}
		gs_free_ports(dev);
		kfree(dev);
		set_gadget_data(gadget, NULL);
	}

	printk(KERN_INFO "gs_unbind: %s %s unbound\n", GS_LONG_NAME,
		GS_VERSION_STR);
}

/*
 * gs_setup
 *
 * Implements all the control endpoint functionality that's not
 * handled in hardware or the hardware driver.
 *
 * Returns the size of the data sent to the host, or a negative
 * error number.
 */
static int gs_setup(struct usb_gadget *gadget,
	const struct usb_ctrlrequest *ctrl)
{
	int ret = -EOPNOTSUPP;
	struct gs_dev *dev = get_gadget_data(gadget);
	struct usb_request *req = dev->dev_ctrl_req;
	u16 wIndex = le16_to_cpu(ctrl->wIndex);
	u16 wValue = le16_to_cpu(ctrl->wValue);
	u16 wLength = le16_to_cpu(ctrl->wLength);

	switch (ctrl->bRequestType & USB_TYPE_MASK) {
	case USB_TYPE_STANDARD:
		ret = gs_setup_standard(gadget,ctrl);
		break;

	case USB_TYPE_CLASS:
		ret = gs_setup_class(gadget,ctrl);
		break;

	default:
		printk(KERN_ERR "gs_setup: unknown request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
			ctrl->bRequestType, ctrl->bRequest,
			wValue, wIndex, wLength);
		break;
	}

	/* respond with data transfer before status phase? */
	if (ret >= 0) {
		req->length = ret;
		req->zero = ret < wLength
				&& (ret % gadget->ep0->maxpacket) == 0;
		ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
		if (ret < 0) {
			printk(KERN_ERR "gs_setup: cannot queue response, ret=%d\n",
				ret);
			req->status = 0;
			gs_setup_complete(gadget->ep0, req);
		}
	}

	/* device either stalls (ret < 0) or reports success */
	return ret;
}

static int gs_setup_standard(struct usb_gadget *gadget,
	const struct usb_ctrlrequest *ctrl)
{
	int ret = -EOPNOTSUPP;
	struct gs_dev *dev = get_gadget_data(gadget);
	struct usb_request *req = dev->dev_ctrl_req;
	u16 wIndex = le16_to_cpu(ctrl->wIndex);
	u16 wValue = le16_to_cpu(ctrl->wValue);
	u16 wLength = le16_to_cpu(ctrl->wLength);

	switch (ctrl->bRequest) {
	case USB_REQ_GET_DESCRIPTOR:
		if (ctrl->bRequestType != USB_DIR_IN)
			break;

		switch (wValue >> 8) {
		case USB_DT_DEVICE:
			ret = min(wLength,
				(u16)sizeof(struct usb_device_descriptor));
			memcpy(req->buf, &gs_device_desc, ret);
			break;

#ifdef CONFIG_USB_GADGET_DUALSPEED
		case USB_DT_DEVICE_QUALIFIER:
			if (!gadget->is_dualspeed)
				break;
			ret = min(wLength,
				(u16)sizeof(struct usb_qualifier_descriptor));
			memcpy(req->buf, &gs_qualifier_desc, ret);
			break;

		case USB_DT_OTHER_SPEED_CONFIG:
			if (!gadget->is_dualspeed)
				break;
			/* fall through */
#endif /* CONFIG_USB_GADGET_DUALSPEED */
		case USB_DT_CONFIG:
			ret = gs_build_config_buf(req->buf, gadget->speed,
				wValue >> 8, wValue & 0xff,
				gadget->is_otg);
			if (ret >= 0)
				ret = min(wLength, (u16)ret);
			break;

		case USB_DT_STRING:
			/* wIndex == language code. */
			ret = usb_gadget_get_string(&gs_string_table,
				wValue & 0xff, req->buf);
			if (ret >= 0)
				ret = min(wLength, (u16)ret);
			break;
		}
		break;

	case USB_REQ_SET_CONFIGURATION:
		if (ctrl->bRequestType != 0)
			break;
		spin_lock(&dev->dev_lock);
		ret = gs_set_config(dev, wValue);
		spin_unlock(&dev->dev_lock);
		break;

	case USB_REQ_GET_CONFIGURATION:
		if (ctrl->bRequestType != USB_DIR_IN)
			break;
		*(u8 *)req->buf = dev->dev_config;
		ret = min(wLength, (u16)1);
		break;

	case USB_REQ_SET_INTERFACE:
		if (ctrl->bRequestType != USB_RECIP_INTERFACE
				|| !dev->dev_config
				|| wIndex >= GS_MAX_NUM_INTERFACES)
			break;
		if (dev->dev_config == GS_BULK_CONFIG_ID
				&& wIndex != GS_BULK_INTERFACE_ID)
			break;
		/* no alternate interface settings */
		if (wValue != 0)
			break;
		spin_lock(&dev->dev_lock);
		/* PXA hardware partially handles SET_INTERFACE;
		 * we need to kluge around that interference.  */
		if (gadget_is_pxa(gadget)) {
			ret = gs_set_config(dev, use_acm ?
				GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
			goto set_interface_done;
		}
		if (dev->dev_config != GS_BULK_CONFIG_ID
				&& wIndex == GS_CONTROL_INTERFACE_ID) {
			if (dev->dev_notify_ep) {
				usb_ep_disable(dev->dev_notify_ep);
				usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
			}
		} else {
			usb_ep_disable(dev->dev_in_ep);
			usb_ep_disable(dev->dev_out_ep);
			usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
			usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
		}
		ret = 0;
set_interface_done:
		spin_unlock(&dev->dev_lock);
		break;

	case USB_REQ_GET_INTERFACE:
		if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
		|| dev->dev_config == GS_NO_CONFIG_ID)
			break;
		if (wIndex >= GS_MAX_NUM_INTERFACES
				|| (dev->dev_config == GS_BULK_CONFIG_ID
				&& wIndex != GS_BULK_INTERFACE_ID)) {
			ret = -EDOM;
			break;
		}
		/* no alternate interface settings */
		*(u8 *)req->buf = 0;
		ret = min(wLength, (u16)1);
		break;

	default:
		printk(KERN_ERR "gs_setup: unknown standard request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
			ctrl->bRequestType, ctrl->bRequest,
			wValue, wIndex, wLength);
		break;
	}

	return ret;
}

static int gs_setup_class(struct usb_gadget *gadget,
	const struct usb_ctrlrequest *ctrl)
{
	int ret = -EOPNOTSUPP;
	struct gs_dev *dev = get_gadget_data(gadget);
	struct gs_port *port = dev->dev_port[0];	/* ACM only has one port */
	struct usb_request *req = dev->dev_ctrl_req;
	u16 wIndex = le16_to_cpu(ctrl->wIndex);
	u16 wValue = le16_to_cpu(ctrl->wValue);
	u16 wLength = le16_to_cpu(ctrl->wLength);

	switch (ctrl->bRequest) {
	case USB_CDC_REQ_SET_LINE_CODING:
		ret = min(wLength,
			(u16)sizeof(struct usb_cdc_line_coding));
		if (port) {
			spin_lock(&port->port_lock);
			memcpy(&port->port_line_coding, req->buf, ret);
			spin_unlock(&port->port_lock);
		}
		break;

	case USB_CDC_REQ_GET_LINE_CODING:
		port = dev->dev_port[0];	/* ACM only has one port */
		ret = min(wLength,
			(u16)sizeof(struct usb_cdc_line_coding));
		if (port) {
			spin_lock(&port->port_lock);
			memcpy(req->buf, &port->port_line_coding, ret);
			spin_unlock(&port->port_lock);
		}
		break;

	case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
		ret = 0;
		break;

	default:
		printk(KERN_ERR "gs_setup: unknown class request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
			ctrl->bRequestType, ctrl->bRequest,
			wValue, wIndex, wLength);
		break;
	}

	return ret;
}

/*
 * gs_setup_complete
 */
static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
{
	if (req->status || req->actual != req->length) {
		printk(KERN_ERR "gs_setup_complete: status error, status=%d, actual=%d, length=%d\n",
			req->status, req->actual, req->length);
	}
}

/*
 * gs_disconnect
 *
 * Called when the device is disconnected.  Frees the closed
 * ports and disconnects open ports.  Open ports will be freed
 * on close.  Then reallocates the ports for the next connection.
 */
static void gs_disconnect(struct usb_gadget *gadget)
{
	unsigned long flags;
	struct gs_dev *dev = get_gadget_data(gadget);

	spin_lock_irqsave(&dev->dev_lock, flags);

	gs_reset_config(dev);

	/* free closed ports and disconnect open ports */
	/* (open ports will be freed when closed) */
	gs_free_ports(dev);

	/* re-allocate ports for the next connection */
	if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
		printk(KERN_ERR "gs_disconnect: cannot re-allocate ports\n");

	spin_unlock_irqrestore(&dev->dev_lock, flags);

	printk(KERN_INFO "gs_disconnect: %s disconnected\n", GS_LONG_NAME);
}

/*
 * gs_set_config
 *
 * Configures the device by enabling device specific
 * optimizations, setting up the endpoints, allocating
 * read and write requests and queuing read requests.
 *
 * The device lock must be held when calling this function.
 */
static int gs_set_config(struct gs_dev *dev, unsigned config)
{
	int i;
	int ret = 0;
	struct usb_gadget *gadget = dev->dev_gadget;
	struct usb_ep *ep;
	struct usb_endpoint_descriptor *ep_desc;
	struct usb_request *req;
	struct gs_req_entry *req_entry;

	if (dev == NULL) {
		printk(KERN_ERR "gs_set_config: NULL device pointer\n");
		return 0;
	}

	if (config == dev->dev_config)
		return 0;

	gs_reset_config(dev);

	switch (config) {
	case GS_NO_CONFIG_ID:
		return 0;
	case GS_BULK_CONFIG_ID:
		if (use_acm)
			return -EINVAL;
		/* device specific optimizations */
		if (gadget_is_net2280(gadget))
			net2280_set_fifo_mode(gadget, 1);
		break;
	case GS_ACM_CONFIG_ID:
		if (!use_acm)
			return -EINVAL;
		/* device specific optimizations */
		if (gadget_is_net2280(gadget))
			net2280_set_fifo_mode(gadget, 1);
		break;
	default:
		return -EINVAL;
	}

	dev->dev_config = config;

	gadget_for_each_ep(ep, gadget) {

		if (EP_NOTIFY_NAME
		&& strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
			ep_desc = GS_SPEED_SELECT(
				gadget->speed == USB_SPEED_HIGH,
				&gs_highspeed_notify_desc,
				&gs_fullspeed_notify_desc);
			ret = usb_ep_enable(ep,ep_desc);
			if (ret == 0) {
				ep->driver_data = dev;
				dev->dev_notify_ep = ep;
				dev->dev_notify_ep_desc = ep_desc;
			} else {
				printk(KERN_ERR "gs_set_config: cannot enable notify endpoint %s, ret=%d\n",
					ep->name, ret);
				goto exit_reset_config;
			}
		}

		else if (strcmp(ep->name, EP_IN_NAME) == 0) {
			ep_desc = GS_SPEED_SELECT(
				gadget->speed == USB_SPEED_HIGH,
 				&gs_highspeed_in_desc,
				&gs_fullspeed_in_desc);
			ret = usb_ep_enable(ep,ep_desc);
			if (ret == 0) {
				ep->driver_data = dev;
				dev->dev_in_ep = ep;
				dev->dev_in_ep_desc = ep_desc;
			} else {
				printk(KERN_ERR "gs_set_config: cannot enable in endpoint %s, ret=%d\n",
					ep->name, ret);
				goto exit_reset_config;
			}
		}

		else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
			ep_desc = GS_SPEED_SELECT(
				gadget->speed == USB_SPEED_HIGH,
				&gs_highspeed_out_desc,