usb gadget serial: split out CDC ACM function (4d5a73dc) · Commits · e / devices / android_kernel_teracube_emerald

Documentation/DocBook/gadget.tmpl

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -556,6 +556,8 @@ been converted to this framework.
	Near-term plans include converting all of them, except for "gadgetfs".		Near-term plans include converting all of them, except for "gadgetfs".
	</para>		</para>

			!Edrivers/usb/gadget/f_acm.c

	</sect1>		</sect1>

drivers/usb/gadget/Makefile

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -26,7 +26,7 @@ C_UTILS = composite.o usbstring.o config.o epautoconf.o

	g_zero-objs := zero.o f_sourcesink.o f_loopback.o $(C_UTILS)		g_zero-objs := zero.o f_sourcesink.o f_loopback.o $(C_UTILS)
	g_ether-objs := ether.o usbstring.o config.o epautoconf.o		g_ether-objs := ether.o usbstring.o config.o epautoconf.o
	g_serial-objs := serial.o u_serial.o usbstring.o config.o epautoconf.o		g_serial-objs := serial.o u_serial.o f_acm.o $(C_UTILS)
	g_midi-objs := gmidi.o usbstring.o config.o epautoconf.o		g_midi-objs := gmidi.o usbstring.o config.o epautoconf.o
	gadgetfs-objs := inode.o		gadgetfs-objs := inode.o
	g_file_storage-objs := file_storage.o usbstring.o config.o \		g_file_storage-objs := file_storage.o usbstring.o config.o \

drivers/usb/gadget/f_acm.c

0 → 100644

+589 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* f_acm.c -- USB CDC serial (ACM) function driver
			*
			* Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
			* Copyright (C) 2008 by David Brownell
			* Copyright (C) 2008 by Nokia Corporation
			*
			* This software is distributed under the terms of the GNU General
			* Public License ("GPL") as published by the Free Software Foundation,
			* either version 2 of that License or (at your option) any later version.
			*/

			/* #define VERBOSE_DEBUG */

			#include <linux/kernel.h>
			#include <linux/device.h>

			#include "u_serial.h"
			#include "gadget_chips.h"


			/*
			* This CDC ACM function support just wraps control functions and
			* notifications around the generic serial-over-usb code.
			*
			* Because CDC ACM is standardized by the USB-IF, many host operating
			* systems have drivers for it. Accordingly, ACM is the preferred
			* interop solution for serial-port type connections. The control
			* models are often not necessary, and in any case don't do much in
			* this bare-bones implementation.
			*
			* Note that even MS-Windows has some support for ACM. However, that
			* support is somewhat broken because when you use ACM in a composite
			* device, having multiple interfaces confuses the poor OS. It doesn't
			* seem to understand CDC Union descriptors. The new "association"
			* descriptors (roughly equivalent to CDC Unions) may sometimes help.
			*/

			struct acm_ep_descs {
			struct usb_endpoint_descriptor *in;
			struct usb_endpoint_descriptor *out;
			struct usb_endpoint_descriptor *notify;
			};

			struct f_acm {
			struct gserial port;
			u8 ctrl_id, data_id;
			u8 port_num;

			struct usb_descriptor_header **fs_function;
			struct acm_ep_descs fs;
			struct usb_descriptor_header **hs_function;
			struct acm_ep_descs hs;

			struct usb_ep *notify;
			struct usb_endpoint_descriptor *notify_desc;

			struct usb_cdc_line_coding port_line_coding; /* 8-N-1 etc */
			u16 port_handshake_bits;
			#define RS232_RTS (1 << 1) /* unused with full duplex */
			#define RS232_DTR (1 << 0) /* host is ready for data r/w */
			};

			static inline struct f_acm func_to_acm(struct usb_function f)
			{
			return container_of(f, struct f_acm, port.func);
			}

			/-------------------------------------------------------------------------/

			/* notification endpoint uses smallish and infrequent fixed-size messages */

			#define GS_LOG2_NOTIFY_INTERVAL 5 /* 1 << 5 == 32 msec */
			#define GS_NOTIFY_MAXPACKET 8

			/* interface and class descriptors: */

			static struct usb_interface_descriptor acm_control_interface_desc __initdata = {
			.bLength = USB_DT_INTERFACE_SIZE,
			.bDescriptorType = USB_DT_INTERFACE,
			/* .bInterfaceNumber = DYNAMIC */
			.bNumEndpoints = 1,
			.bInterfaceClass = USB_CLASS_COMM,
			.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
			.bInterfaceProtocol = USB_CDC_ACM_PROTO_AT_V25TER,
			/* .iInterface = DYNAMIC */
			};

			static struct usb_interface_descriptor acm_data_interface_desc __initdata = {
			.bLength = USB_DT_INTERFACE_SIZE,
			.bDescriptorType = USB_DT_INTERFACE,
			/* .bInterfaceNumber = DYNAMIC */
			.bNumEndpoints = 2,
			.bInterfaceClass = USB_CLASS_CDC_DATA,
			.bInterfaceSubClass = 0,
			.bInterfaceProtocol = 0,
			/* .iInterface = DYNAMIC */
			};

			static struct usb_cdc_header_desc acm_header_desc __initdata = {
			.bLength = sizeof(acm_header_desc),
			.bDescriptorType = USB_DT_CS_INTERFACE,
			.bDescriptorSubType = USB_CDC_HEADER_TYPE,
			.bcdCDC = __constant_cpu_to_le16(0x0110),
			};

			static struct usb_cdc_call_mgmt_descriptor
			acm_call_mgmt_descriptor __initdata = {
			.bLength = sizeof(acm_call_mgmt_descriptor),
			.bDescriptorType = USB_DT_CS_INTERFACE,
			.bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
			.bmCapabilities = 0,
			/* .bDataInterface = DYNAMIC */
			};

			static struct usb_cdc_acm_descriptor acm_descriptor __initdata = {
			.bLength = sizeof(acm_descriptor),
			.bDescriptorType = USB_DT_CS_INTERFACE,
			.bDescriptorSubType = USB_CDC_ACM_TYPE,
			.bmCapabilities = (1 << 1),
			};

			static struct usb_cdc_union_desc acm_union_desc __initdata = {
			.bLength = sizeof(acm_union_desc),
			.bDescriptorType = USB_DT_CS_INTERFACE,
			.bDescriptorSubType = USB_CDC_UNION_TYPE,
			/* .bMasterInterface0 = DYNAMIC */
			/* .bSlaveInterface0 = DYNAMIC */
			};

			/* full speed support: */

			static struct usb_endpoint_descriptor acm_fs_notify_desc __initdata = {
			.bLength = USB_DT_ENDPOINT_SIZE,
			.bDescriptorType = USB_DT_ENDPOINT,
			.bEndpointAddress = USB_DIR_IN,
			.bmAttributes = USB_ENDPOINT_XFER_INT,
			.wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
			.bInterval = 1 << GS_LOG2_NOTIFY_INTERVAL,
			};

			static struct usb_endpoint_descriptor acm_fs_in_desc __initdata = {
			.bLength = USB_DT_ENDPOINT_SIZE,
			.bDescriptorType = USB_DT_ENDPOINT,
			.bEndpointAddress = USB_DIR_IN,
			.bmAttributes = USB_ENDPOINT_XFER_BULK,
			};

			static struct usb_endpoint_descriptor acm_fs_out_desc __initdata = {
			.bLength = USB_DT_ENDPOINT_SIZE,
			.bDescriptorType = USB_DT_ENDPOINT,
			.bEndpointAddress = USB_DIR_OUT,
			.bmAttributes = USB_ENDPOINT_XFER_BULK,
			};

			static struct usb_descriptor_header *acm_fs_function[] __initdata = {
			(struct usb_descriptor_header *) &acm_control_interface_desc,
			(struct usb_descriptor_header *) &acm_header_desc,
			(struct usb_descriptor_header *) &acm_call_mgmt_descriptor,
			(struct usb_descriptor_header *) &acm_descriptor,
			(struct usb_descriptor_header *) &acm_union_desc,
			(struct usb_descriptor_header *) &acm_fs_notify_desc,
			(struct usb_descriptor_header *) &acm_data_interface_desc,
			(struct usb_descriptor_header *) &acm_fs_in_desc,
			(struct usb_descriptor_header *) &acm_fs_out_desc,
			NULL,
			};

			/* high speed support: */

			static struct usb_endpoint_descriptor acm_hs_notify_desc __initdata = {
			.bLength = USB_DT_ENDPOINT_SIZE,
			.bDescriptorType = USB_DT_ENDPOINT,
			.bEndpointAddress = USB_DIR_IN,
			.bmAttributes = USB_ENDPOINT_XFER_INT,
			.wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
			.bInterval = GS_LOG2_NOTIFY_INTERVAL+4,
			};

			static struct usb_endpoint_descriptor acm_hs_in_desc __initdata = {
			.bLength = USB_DT_ENDPOINT_SIZE,
			.bDescriptorType = USB_DT_ENDPOINT,
			.bmAttributes = USB_ENDPOINT_XFER_BULK,
			.wMaxPacketSize = __constant_cpu_to_le16(512),
			};

			static struct usb_endpoint_descriptor acm_hs_out_desc __initdata = {
			.bLength = USB_DT_ENDPOINT_SIZE,
			.bDescriptorType = USB_DT_ENDPOINT,
			.bmAttributes = USB_ENDPOINT_XFER_BULK,
			.wMaxPacketSize = __constant_cpu_to_le16(512),
			};

			static struct usb_descriptor_header *acm_hs_function[] __initdata = {
			(struct usb_descriptor_header *) &acm_control_interface_desc,
			(struct usb_descriptor_header *) &acm_header_desc,
			(struct usb_descriptor_header *) &acm_call_mgmt_descriptor,
			(struct usb_descriptor_header *) &acm_descriptor,
			(struct usb_descriptor_header *) &acm_union_desc,
			(struct usb_descriptor_header *) &acm_hs_notify_desc,
			(struct usb_descriptor_header *) &acm_data_interface_desc,
			(struct usb_descriptor_header *) &acm_hs_in_desc,
			(struct usb_descriptor_header *) &acm_hs_out_desc,
			NULL,
			};

			/* string descriptors: */

			#define ACM_CTRL_IDX 0
			#define ACM_DATA_IDX 1

			/* static strings, in UTF-8 */
			static struct usb_string acm_string_defs[] = {
			[ACM_CTRL_IDX].s = "CDC Abstract Control Model (ACM)",
			[ACM_DATA_IDX].s = "CDC ACM Data",
			{ /* ZEROES END LIST */ },
			};

			static struct usb_gadget_strings acm_string_table = {
			.language = 0x0409, /* en-us */
			.strings = acm_string_defs,
			};

			static struct usb_gadget_strings *acm_strings[] = {
			&acm_string_table,
			NULL,
			};

			/-------------------------------------------------------------------------/

			/* ACM control ... data handling is delegated to tty library code.
			* The main task of this function is to activate and deactivate
			* that code based on device state; track parameters like line
			* speed, handshake state, and so on; and issue notifications.
			*/

			static void acm_complete_set_line_coding(struct usb_ep *ep,
			struct usb_request *req)
			{
			struct f_acm *acm = ep->driver_data;
			struct usb_composite_dev *cdev = acm->port.func.config->cdev;

			if (req->status != 0) {
			DBG(cdev, "acm ttyGS%d completion, err %d\n",
			acm->port_num, req->status);
			return;
			}

			/* normal completion */
			if (req->actual != sizeof(acm->port_line_coding)) {
			DBG(cdev, "acm ttyGS%d short resp, len %d\n",
			acm->port_num, req->actual);
			usb_ep_set_halt(ep);
			} else {
			struct usb_cdc_line_coding *value = req->buf;

			/* REVISIT: we currently just remember this data.
			* If we change that, (a) validate it first, then
			* (b) update whatever hardware needs updating,
			* (c) worry about locking. This is information on
			* the order of 9600-8-N-1 ... most of which means
			* nothing unless we control a real RS232 line.
			*/
			acm->port_line_coding = *value;
			}
			}

			static int acm_setup(struct usb_function f, const struct usb_ctrlrequest ctrl)
			{
			struct f_acm *acm = func_to_acm(f);
			struct usb_composite_dev *cdev = f->config->cdev;
			struct usb_request *req = cdev->req;
			int value = -EOPNOTSUPP;
			u16 w_index = le16_to_cpu(ctrl->wIndex);
			u16 w_value = le16_to_cpu(ctrl->wValue);
			u16 w_length = le16_to_cpu(ctrl->wLength);

			/* composite driver infrastructure handles everything except
			* CDC class messages; interface activation uses set_alt().
			*/
			switch ((ctrl->bRequestType << 8) \| ctrl->bRequest) {

			/* SET_LINE_CODING ... just read and save what the host sends */
			case ((USB_DIR_OUT \| USB_TYPE_CLASS \| USB_RECIP_INTERFACE) << 8)
			\| USB_CDC_REQ_SET_LINE_CODING:
			if (w_length != sizeof(struct usb_cdc_line_coding)
			\|\| w_index != acm->ctrl_id)
			goto invalid;

			value = w_length;
			cdev->gadget->ep0->driver_data = acm;
			req->complete = acm_complete_set_line_coding;
			break;

			/* GET_LINE_CODING ... return what host sent, or initial value */
			case ((USB_DIR_IN \| USB_TYPE_CLASS \| USB_RECIP_INTERFACE) << 8)
			\| USB_CDC_REQ_GET_LINE_CODING:
			if (w_index != acm->ctrl_id)
			goto invalid;

			value = min_t(unsigned, w_length,
			sizeof(struct usb_cdc_line_coding));
			memcpy(req->buf, &acm->port_line_coding, value);
			break;

			/* SET_CONTROL_LINE_STATE ... save what the host sent */
			case ((USB_DIR_OUT \| USB_TYPE_CLASS \| USB_RECIP_INTERFACE) << 8)
			\| USB_CDC_REQ_SET_CONTROL_LINE_STATE:
			if (w_index != acm->ctrl_id)
			goto invalid;

			value = 0;

			/* FIXME we should not allow data to flow until the
			* host sets the RS232_DTR bit; and when it clears
			* that bit, we should return to that no-flow state.
			*/
			acm->port_handshake_bits = w_value;
			break;

			default:
			invalid:
			VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
			ctrl->bRequestType, ctrl->bRequest,
			w_value, w_index, w_length);
			}

			/* respond with data transfer or status phase? */
			if (value >= 0) {
			DBG(cdev, "acm ttyGS%d req%02x.%02x v%04x i%04x l%d\n",
			acm->port_num, ctrl->bRequestType, ctrl->bRequest,
			w_value, w_index, w_length);
			req->zero = 0;
			req->length = value;
			value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
			if (value < 0)
			ERROR(cdev, "acm response on ttyGS%d, err %d\n",
			acm->port_num, value);
			}

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

			static int acm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
			{
			struct f_acm *acm = func_to_acm(f);
			struct usb_composite_dev *cdev = f->config->cdev;

			/* we know alt == 0, so this is an activation or a reset */

			if (intf == acm->ctrl_id) {
			/* REVISIT this may need more work when we start to
			* send notifications ...
			*/
			if (acm->notify->driver_data) {
			VDBG(cdev, "reset acm control interface %d\n", intf);
			usb_ep_disable(acm->notify);
			} else {
			VDBG(cdev, "init acm ctrl interface %d\n", intf);
			acm->notify_desc = ep_choose(cdev->gadget,
			acm->hs.notify,
			acm->fs.notify);
			}
			usb_ep_enable(acm->notify, acm->notify_desc);
			acm->notify->driver_data = acm;

			} else if (intf == acm->data_id) {
			if (acm->port.in->driver_data) {
			DBG(cdev, "reset acm ttyGS%d\n", acm->port_num);
			gserial_disconnect(&acm->port);
			} else {
			DBG(cdev, "activate acm ttyGS%d\n", acm->port_num);
			acm->port.in_desc = ep_choose(cdev->gadget,
			acm->hs.in, acm->fs.in);
			acm->port.out_desc = ep_choose(cdev->gadget,
			acm->hs.out, acm->fs.out);
			}
			gserial_connect(&acm->port, acm->port_num);

			} else
			return -EINVAL;

			return 0;
			}

			static void acm_disable(struct usb_function *f)
			{
			struct f_acm *acm = func_to_acm(f);
			struct usb_composite_dev *cdev = f->config->cdev;

			DBG(cdev, "acm ttyGS%d deactivated\n", acm->port_num);
			gserial_disconnect(&acm->port);
			usb_ep_disable(acm->notify);
			acm->notify->driver_data = NULL;
			}

			/-------------------------------------------------------------------------/

			/* ACM function driver setup/binding */
			static int __init
			acm_bind(struct usb_configuration c, struct usb_function f)
			{
			struct usb_composite_dev *cdev = c->cdev;
			struct f_acm *acm = func_to_acm(f);
			int status;
			struct usb_ep *ep;

			/* allocate instance-specific interface IDs, and patch descriptors */
			status = usb_interface_id(c, f);
			if (status < 0)
			goto fail;
			acm->ctrl_id = status;

			acm_control_interface_desc.bInterfaceNumber = status;
			acm_union_desc .bMasterInterface0 = status;

			status = usb_interface_id(c, f);
			if (status < 0)
			goto fail;
			acm->data_id = status;

			acm_data_interface_desc.bInterfaceNumber = status;
			acm_union_desc.bSlaveInterface0 = status;
			acm_call_mgmt_descriptor.bDataInterface = status;

			status = -ENODEV;

			/* allocate instance-specific endpoints */
			ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_in_desc);
			if (!ep)
			goto fail;
			acm->port.in = ep;
			ep->driver_data = cdev; /* claim */

			ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_out_desc);
			if (!ep)
			goto fail;
			acm->port.out = ep;
			ep->driver_data = cdev; /* claim */

			ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_notify_desc);
			if (!ep)
			goto fail;
			acm->notify = ep;
			ep->driver_data = cdev; /* claim */

			/* copy descriptors, and track endpoint copies */
			f->descriptors = usb_copy_descriptors(acm_fs_function);

			acm->fs.in = usb_find_endpoint(acm_fs_function,
			f->descriptors, &acm_fs_in_desc);
			acm->fs.out = usb_find_endpoint(acm_fs_function,
			f->descriptors, &acm_fs_out_desc);
			acm->fs.notify = usb_find_endpoint(acm_fs_function,
			f->descriptors, &acm_fs_notify_desc);

			/* support all relevant hardware speeds... we expect that when
			* hardware is dual speed, all bulk-capable endpoints work at
			* both speeds
			*/
			if (gadget_is_dualspeed(c->cdev->gadget)) {
			acm_hs_in_desc.bEndpointAddress =
			acm_fs_in_desc.bEndpointAddress;
			acm_hs_out_desc.bEndpointAddress =
			acm_fs_out_desc.bEndpointAddress;
			acm_hs_notify_desc.bEndpointAddress =
			acm_fs_notify_desc.bEndpointAddress;

			/* copy descriptors, and track endpoint copies */
			f->hs_descriptors = usb_copy_descriptors(acm_hs_function);

			acm->hs.in = usb_find_endpoint(acm_hs_function,
			f->hs_descriptors, &acm_hs_in_desc);
			acm->hs.out = usb_find_endpoint(acm_hs_function,
			f->hs_descriptors, &acm_hs_out_desc);
			acm->hs.notify = usb_find_endpoint(acm_hs_function,
			f->hs_descriptors, &acm_hs_notify_desc);
			}

			/* FIXME provide a callback for triggering notifications */

			DBG(cdev, "acm ttyGS%d: %s speed IN/%s OUT/%s NOTIFY/%s\n",
			acm->port_num,
			gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
			acm->port.in->name, acm->port.out->name,
			acm->notify->name);
			return 0;

			fail:
			/* we might as well release our claims on endpoints */
			if (acm->notify)
			acm->notify->driver_data = NULL;
			if (acm->port.out)
			acm->port.out->driver_data = NULL;
			if (acm->port.in)
			acm->port.in->driver_data = NULL;

			ERROR(cdev, "%s/%p: can't bind, err %d\n", f->name, f, status);

			return status;
			}

			static void
			acm_unbind(struct usb_configuration c, struct usb_function f)
			{
			if (gadget_is_dualspeed(c->cdev->gadget))
			usb_free_descriptors(f->hs_descriptors);
			usb_free_descriptors(f->descriptors);
			kfree(func_to_acm(f));
			}

			/* Some controllers can't support CDC ACM ... */
			static inline bool can_support_cdc(struct usb_configuration *c)
			{
			/* SH3 doesn't support multiple interfaces */
			if (gadget_is_sh(c->cdev->gadget))
			return false;

			/* sa1100 doesn't have a third interrupt endpoint */
			if (gadget_is_sa1100(c->cdev->gadget))
			return false;

			/* everything else is probably fine ... */
			return true;
			}

			/**
			* acm_bind_config - add a CDC ACM function to a configuration
			* @c: the configuration to support the CDC ACM instance
			* @port_num: /dev/ttyGS* port this interface will use
			* Context: single threaded during gadget setup
			*
			* Returns zero on success, else negative errno.
			*
			* Caller must have called @gserial_setup() with enough ports to
			* handle all the ones it binds. Caller is also responsible
			* for calling @gserial_cleanup() before module unload.
			*/
			int __init acm_bind_config(struct usb_configuration *c, u8 port_num)
			{
			struct f_acm *acm;
			int status;

			if (!can_support_cdc(c))
			return -EINVAL;

			/* REVISIT might want instance-specific strings to help
			* distinguish instances ...
			*/

			/* maybe allocate device-global string IDs, and patch descriptors */
			if (acm_string_defs[ACM_CTRL_IDX].id == 0) {
			status = usb_string_id(c->cdev);
			if (status < 0)
			return status;
			acm_string_defs[ACM_CTRL_IDX].id = status;

			acm_control_interface_desc.iInterface = status;

			status = usb_string_id(c->cdev);
			if (status < 0)
			return status;
			acm_string_defs[ACM_DATA_IDX].id = status;

			acm_data_interface_desc.iInterface = status;
			}

			/* allocate and initialize one new instance */
			acm = kzalloc(sizeof *acm, GFP_KERNEL);
			if (!acm)
			return -ENOMEM;

			acm->port_num = port_num;

			acm->port.func.name = "acm";
			acm->port.func.strings = acm_strings;
			/* descriptors are per-instance copies */
			acm->port.func.bind = acm_bind;
			acm->port.func.unbind = acm_unbind;
			acm->port.func.set_alt = acm_set_alt;
			acm->port.func.setup = acm_setup;
			acm->port.func.disable = acm_disable;

			status = usb_add_function(c, &acm->port.func);
			if (status)
			kfree(acm);
			return status;
			}

drivers/usb/gadget/u_serial.h

+5 −5

Original line number	Original line	Diff line number	Diff line
	@@ -12,10 +12,7 @@
	#ifndef __U_SERIAL_H		#ifndef __U_SERIAL_H
	#define __U_SERIAL_H		#define __U_SERIAL_H

	/* #include <linux/usb/composite.h> */		#include <linux/usb/composite.h>
	#include <linux/usb/ch9.h>
	#include <linux/usb/gadget.h>

	#include <linux/usb/cdc.h>		#include <linux/usb/cdc.h>

	/*		/*
	@@ -32,7 +29,7 @@
	* REVISIT someday, allow multiplexing several TTYs over these endpoints.		* REVISIT someday, allow multiplexing several TTYs over these endpoints.
	*/		*/
	struct gserial {		struct gserial {
	/* struct usb_function func; */		struct usb_function func;

	/* port is managed by gserial_{connect,disconnect} */		/* port is managed by gserial_{connect,disconnect} */
	struct gs_port *ioport;		struct gs_port *ioport;
	@@ -59,4 +56,7 @@ void gserial_cleanup(void);
	int gserial_connect(struct gserial *, u8 port_num);		int gserial_connect(struct gserial *, u8 port_num);
	void gserial_disconnect(struct gserial *);		void gserial_disconnect(struct gserial *);

			/* functions are bound to configurations by a config or gadget driver */
			int acm_bind_config(struct usb_configuration *c, u8 port_num);

	#endif /* __U_SERIAL_H */		#endif /* __U_SERIAL_H */