[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / gadget / epautoconf.c

/*
 * epautoconf.c -- endpoint autoconfiguration for usb gadget drivers
 *
 * Copyright (C) 2004 David Brownell
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

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

#include <linux/ctype.h>
#include <linux/string.h>

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

#include "gadget_chips.h"


/* we must assign addresses for configurable endpoints (like net2280) */
static unsigned epnum;

// #define MANY_ENDPOINTS
#ifdef MANY_ENDPOINTS
/* more than 15 configurable endpoints */
static unsigned in_epnum;
#endif


/*
 * This should work with endpoints from controller drivers sharing the
 * same endpoint naming convention.  By example:
 *
 *	- ep1, ep2, ... address is fixed, not direction or type
 *	- ep1in, ep2out, ... address and direction are fixed, not type
 *	- ep1-bulk, ep2-bulk, ... address and type are fixed, not direction
 *	- ep1in-bulk, ep2out-iso, ... all three are fixed
 *	- ep-* ... no functionality restrictions
 *
 * Type suffixes are "-bulk", "-iso", or "-int".  Numbers are decimal.
 * Less common restrictions are implied by gadget_is_*().
 *
 * NOTE:  each endpoint is unidirectional, as specified by its USB
 * descriptor; and isn't specific to a configuration or altsetting.
 */
static int
ep_matches (
	struct usb_gadget		*gadget,
	struct usb_ep			*ep,
	struct usb_endpoint_descriptor	*desc,
	struct usb_ss_ep_comp_descriptor *ep_comp
)
{
	u8		type;
	const char	*tmp;
	u16		max;

	int		num_req_streams = 0;

	/* endpoint already claimed? */
	if (NULL != ep->driver_data)
		return 0;

	/* only support ep0 for portable CONTROL traffic */
	type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
	if (USB_ENDPOINT_XFER_CONTROL == type)
		return 0;

	/* some other naming convention */
	if ('e' != ep->name[0])
		return 0;

	/* type-restriction:  "-iso", "-bulk", or "-int".
	 * direction-restriction:  "in", "out".
	 */
	if ('-' != ep->name[2]) {
		tmp = strrchr (ep->name, '-');
		if (tmp) {
			switch (type) {
			case USB_ENDPOINT_XFER_INT:
				/* bulk endpoints handle interrupt transfers,
				 * except the toggle-quirky iso-synch kind
				 */
				if ('s' == tmp[2])	// == "-iso"
					return 0;
				/* for now, avoid PXA "interrupt-in";
				 * it's documented as never using DATA1.
				 */
				if (gadget_is_pxa (gadget)
						&& 'i' == tmp [1])
					return 0;
				break;
			case USB_ENDPOINT_XFER_BULK:
				if ('b' != tmp[1])	// != "-bulk"
					return 0;
				break;
			case USB_ENDPOINT_XFER_ISOC:
				if ('s' != tmp[2])	// != "-iso"
					return 0;
			}
		} else {
			tmp = ep->name + strlen (ep->name);
		}

		/* direction-restriction:  "..in-..", "out-.." */
		tmp--;
		if (!isdigit (*tmp)) {
			if (desc->bEndpointAddress & USB_DIR_IN) {
				if ('n' != *tmp)
					return 0;
			} else {
				if ('t' != *tmp)
					return 0;
			}
		}
	}

	/*
	 * Get the number of required streams from the EP companion
	 * descriptor and see if the EP matches it
	 */
	if (usb_endpoint_xfer_bulk(desc)) {
		if (ep_comp) {
			num_req_streams = ep_comp->bmAttributes & 0x1f;
			if (num_req_streams > ep->max_streams)
				return 0;
		}

	}

	/*
	 * If the protocol driver hasn't yet decided on wMaxPacketSize
	 * and wants to know the maximum possible, provide the info.
	 */
	if (desc->wMaxPacketSize == 0)
		desc->wMaxPacketSize = cpu_to_le16(ep->maxpacket);

	/* endpoint maxpacket size is an input parameter, except for bulk
	 * where it's an output parameter representing the full speed limit.
	 * the usb spec fixes high speed bulk maxpacket at 512 bytes.
	 */
	max = 0x7ff & usb_endpoint_maxp(desc);
	switch (type) {
	case USB_ENDPOINT_XFER_INT:
		/* INT:  limit 64 bytes full speed, 1024 high/super speed */
		if (!gadget_is_dualspeed(gadget) && max > 64)
			return 0;
		/* FALLTHROUGH */

	case USB_ENDPOINT_XFER_ISOC:
		/* ISO:  limit 1023 bytes full speed, 1024 high/super speed */
		if (ep->maxpacket < max)
			return 0;
		if (!gadget_is_dualspeed(gadget) && max > 1023)
			return 0;

		/* BOTH:  "high bandwidth" works only at high speed */
		if ((desc->wMaxPacketSize & cpu_to_le16(3<<11))) {
			if (!gadget_is_dualspeed(gadget))
				return 0;
			/* configure your hardware with enough buffering!! */
		}
		break;
	}

	/* MATCH!! */

	/* report address */
	desc->bEndpointAddress &= USB_DIR_IN;
	if (isdigit (ep->name [2])) {
		u8	num = simple_strtoul (&ep->name [2], NULL, 10);
		desc->bEndpointAddress |= num;
#ifdef	MANY_ENDPOINTS
	} else if (desc->bEndpointAddress & USB_DIR_IN) {
		if (++in_epnum > 15)
			return 0;
		desc->bEndpointAddress = USB_DIR_IN | in_epnum;
#endif
	} else {
		if (++epnum > 15)
			return 0;
		desc->bEndpointAddress |= epnum;
	}

	/* report (variable) full speed bulk maxpacket */
	if ((USB_ENDPOINT_XFER_BULK == type) && !ep_comp) {
		int size = ep->maxpacket;

		/* min() doesn't work on bitfields with gcc-3.5 */
		if (size > 64)
			size = 64;
		desc->wMaxPacketSize = cpu_to_le16(size);
	}
	ep->address = desc->bEndpointAddress;
	return 1;
}

static struct usb_ep *
find_ep (struct usb_gadget *gadget, const char *name)
{
	struct usb_ep	*ep;

	list_for_each_entry (ep, &gadget->ep_list, ep_list) {
		if (0 == strcmp (ep->name, name))
			return ep;
	}
	return NULL;
}

/**
 * usb_ep_autoconfig_ss() - choose an endpoint matching the ep
 * descriptor and ep companion descriptor
 * @gadget: The device to which the endpoint must belong.
 * @desc: Endpoint descriptor, with endpoint direction and transfer mode
 *    initialized.  For periodic transfers, the maximum packet
 *    size must also be initialized.  This is modified on
 *    success.
 * @ep_comp: Endpoint companion descriptor, with the required
 *    number of streams. Will be modified when the chosen EP
 *    supports a different number of streams.
 *
 * This routine replaces the usb_ep_autoconfig when needed
 * superspeed enhancments. If such enhancemnets are required,
 * the FD should call usb_ep_autoconfig_ss directly and provide
 * the additional ep_comp parameter.
 *
 * By choosing an endpoint to use with the specified descriptor,
 * this routine simplifies writing gadget drivers that work with
 * multiple USB device controllers.  The endpoint would be
 * passed later to usb_ep_enable(), along with some descriptor.
 *
 * That second descriptor won't always be the same as the first one.
 * For example, isochronous endpoints can be autoconfigured for high
 * bandwidth, and then used in several lower bandwidth altsettings.
 * Also, high and full speed descriptors will be different.
 *
 * Be sure to examine and test the results of autoconfiguration
 * on your hardware.  This code may not make the best choices
 * about how to use the USB controller, and it can't know all
 * the restrictions that may apply. Some combinations of driver
 * and hardware won't be able to autoconfigure.
 *
 * On success, this returns an un-claimed usb_ep, and modifies the endpoint
 * descriptor bEndpointAddress.  For bulk endpoints, the wMaxPacket value
 * is initialized as if the endpoint were used at full speed and
 * the bmAttribute field in the ep companion descriptor is
 * updated with the assigned number of streams if it is
 * different from the original value. To prevent the endpoint
 * from being returned by a later autoconfig call, claim it by
 * assigning ep->driver_data to some non-null value.
 *
 * On failure, this returns a null endpoint descriptor.
 */
struct usb_ep *usb_ep_autoconfig_ss(
	struct usb_gadget		*gadget,
	struct usb_endpoint_descriptor	*desc,
	struct usb_ss_ep_comp_descriptor *ep_comp
)
{
	struct usb_ep	*ep;
	u8		type;

	type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;

	/* First, apply chip-specific "best usage" knowledge.
	 * This might make a good usb_gadget_ops hook ...
	 */
	if (gadget_is_net2280 (gadget) && type == USB_ENDPOINT_XFER_INT) {
		/* ep-e, ep-f are PIO with only 64 byte fifos */
		ep = find_ep (gadget, "ep-e");
		if (ep && ep_matches(gadget, ep, desc, ep_comp))
			return ep;
		ep = find_ep (gadget, "ep-f");
		if (ep && ep_matches(gadget, ep, desc, ep_comp))
			return ep;

	} else if (gadget_is_goku (gadget)) {
		if (USB_ENDPOINT_XFER_INT == type) {
			/* single buffering is enough */
			ep = find_ep(gadget, "ep3-bulk");
			if (ep && ep_matches(gadget, ep, desc, ep_comp))
				return ep;
		} else if (USB_ENDPOINT_XFER_BULK == type
				&& (USB_DIR_IN & desc->bEndpointAddress)) {
			/* DMA may be available */
			ep = find_ep(gadget, "ep2-bulk");
			if (ep && ep_matches(gadget, ep, desc,
					      ep_comp))
				return ep;
		}

#ifdef CONFIG_BLACKFIN
	} else if (gadget_is_musbhdrc(gadget)) {
		if ((USB_ENDPOINT_XFER_BULK == type) ||
		    (USB_ENDPOINT_XFER_ISOC == type)) {
			if (USB_DIR_IN & desc->bEndpointAddress)
				ep = find_ep (gadget, "ep5in");
			else
				ep = find_ep (gadget, "ep6out");
		} else if (USB_ENDPOINT_XFER_INT == type) {
			if (USB_DIR_IN & desc->bEndpointAddress)
				ep = find_ep(gadget, "ep1in");
			else
				ep = find_ep(gadget, "ep2out");
		} else
			ep = NULL;
		if (ep && ep_matches(gadget, ep, desc, ep_comp))
			return ep;
#endif
	}

	/* Second, look at endpoints until an unclaimed one looks usable */
	list_for_each_entry (ep, &gadget->ep_list, ep_list) {
		if (ep_matches(gadget, ep, desc, ep_comp))
			return ep;
	}

	/* Fail */
	return NULL;
}

/**
 * usb_ep_autoconfig() - choose an endpoint matching the
 * descriptor
 * @gadget: The device to which the endpoint must belong.
 * @desc: Endpoint descriptor, with endpoint direction and transfer mode
 *	initialized.  For periodic transfers, the maximum packet
 *	size must also be initialized.  This is modified on success.
 *
 * By choosing an endpoint to use with the specified descriptor, this
 * routine simplifies writing gadget drivers that work with multiple
 * USB device controllers.  The endpoint would be passed later to
 * usb_ep_enable(), along with some descriptor.
 *
 * That second descriptor won't always be the same as the first one.
 * For example, isochronous endpoints can be autoconfigured for high
 * bandwidth, and then used in several lower bandwidth altsettings.
 * Also, high and full speed descriptors will be different.
 *
 * Be sure to examine and test the results of autoconfiguration on your
 * hardware.  This code may not make the best choices about how to use the
 * USB controller, and it can't know all the restrictions that may apply.
 * Some combinations of driver and hardware won't be able to autoconfigure.
 *
 * On success, this returns an un-claimed usb_ep, and modifies the endpoint
 * descriptor bEndpointAddress.  For bulk endpoints, the wMaxPacket value
 * is initialized as if the endpoint were used at full speed.  To prevent
 * the endpoint from being returned by a later autoconfig call, claim it
 * by assigning ep->driver_data to some non-null value.
 *
 * On failure, this returns a null endpoint descriptor.
 */
struct usb_ep *usb_ep_autoconfig(
	struct usb_gadget		*gadget,
	struct usb_endpoint_descriptor	*desc
)
{
	return usb_ep_autoconfig_ss(gadget, desc, NULL);
}


/**
 * usb_ep_autoconfig_reset - reset endpoint autoconfig state
 * @gadget: device for which autoconfig state will be reset
 *
 * Use this for devices where one configuration may need to assign
 * endpoint resources very differently from the next one.  It clears
 * state such as ep->driver_data and the record of assigned endpoints
 * used by usb_ep_autoconfig().
 */
void usb_ep_autoconfig_reset (struct usb_gadget *gadget)
{
	struct usb_ep	*ep;

	list_for_each_entry (ep, &gadget->ep_list, ep_list) {
		ep->driver_data = NULL;
	}
#ifdef	MANY_ENDPOINTS
	in_epnum = 0;
#endif
	epnum = 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* epautoconf.c -- endpoint autoconfiguration for usb gadget drivers
	3	*
	4	* Copyright (C) 2004 David Brownell
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
1da177e4 LT	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/init.h>
	14	#include <linux/types.h>
	15	#include <linux/device.h>
	16
	17	#include <linux/ctype.h>
	18	#include <linux/string.h>
	19
5f848137	20	#include <linux/usb/ch9.h>
9454a57a	21	#include <linux/usb/gadget.h>
1da177e4 LT	22
	23	#include "gadget_chips.h"
	24
	25
	26	/* we must assign addresses for configurable endpoints (like net2280) */
28824b18	27	static unsigned epnum;
1da177e4 LT	28
	29	// #define MANY_ENDPOINTS
	30	#ifdef MANY_ENDPOINTS
	31	/* more than 15 configurable endpoints */
28824b18	32	static unsigned in_epnum;
1da177e4 LT	33	#endif
	34
	35
	36	/*
	37	* This should work with endpoints from controller drivers sharing the
	38	* same endpoint naming convention. By example:
	39	*
	40	* - ep1, ep2, ... address is fixed, not direction or type
	41	* - ep1in, ep2out, ... address and direction are fixed, not type
	42	* - ep1-bulk, ep2-bulk, ... address and type are fixed, not direction
	43	* - ep1in-bulk, ep2out-iso, ... all three are fixed
	44	* - ep-* ... no functionality restrictions
	45	*
	46	* Type suffixes are "-bulk", "-iso", or "-int". Numbers are decimal.
	47	* Less common restrictions are implied by gadget_is_*().
	48	*
	49	* NOTE: each endpoint is unidirectional, as specified by its USB
	50	* descriptor; and isn't specific to a configuration or altsetting.
	51	*/
28824b18	52	static int
1da177e4 LT	53	ep_matches (
	54	struct usb_gadget *gadget,
	55	struct usb_ep *ep,
a59d6b91 TB	56	struct usb_endpoint_descriptor *desc,
a59d6b91 TB	57	struct usb_ss_ep_comp_descriptor *ep_comp
1da177e4 LT	58	)
	59	{
	60	u8 type;
	61	const char *tmp;
	62	u16 max;
	63
a59d6b91 TB	64	int num_req_streams = 0;
a59d6b91 TB	65
1da177e4	66	/* endpoint already claimed? */
a9475226	67	if (NULL != ep->driver_data)
1da177e4	68	return 0;
a353678d	69
1da177e4 LT	70	/* only support ep0 for portable CONTROL traffic */
	71	type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
	72	if (USB_ENDPOINT_XFER_CONTROL == type)
	73	return 0;
	74
	75	/* some other naming convention */
	76	if ('e' != ep->name[0])
	77	return 0;
	78
	79	/* type-restriction: "-iso", "-bulk", or "-int".
	80	* direction-restriction: "in", "out".
	81	*/
	82	if ('-' != ep->name[2]) {
	83	tmp = strrchr (ep->name, '-');
	84	if (tmp) {
	85	switch (type) {
	86	case USB_ENDPOINT_XFER_INT:
	87	/* bulk endpoints handle interrupt transfers,
	88	* except the toggle-quirky iso-synch kind
	89	*/
	90	if ('s' == tmp[2]) // == "-iso"
	91	return 0;
	92	/* for now, avoid PXA "interrupt-in";
	93	* it's documented as never using DATA1.
	94	*/
	95	if (gadget_is_pxa (gadget)
	96	&& 'i' == tmp [1])
	97	return 0;
	98	break;
	99	case USB_ENDPOINT_XFER_BULK:
	100	if ('b' != tmp[1]) // != "-bulk"
	101	return 0;
	102	break;
	103	case USB_ENDPOINT_XFER_ISOC:
	104	if ('s' != tmp[2]) // != "-iso"
	105	return 0;
	106	}
	107	} else {
	108	tmp = ep->name + strlen (ep->name);
	109	}
	110
	111	/* direction-restriction: "..in-..", "out-.." */
	112	tmp--;
	113	if (!isdigit (*tmp)) {
	114	if (desc->bEndpointAddress & USB_DIR_IN) {
	115	if ('n' != *tmp)
	116	return 0;
	117	} else {
	118	if ('t' != *tmp)
	119	return 0;
	120	}
	121	}
	122	}
	123
a59d6b91 TB	124	/*
	125	* Get the number of required streams from the EP companion
	126	* descriptor and see if the EP matches it
	127	*/
	128	if (usb_endpoint_xfer_bulk(desc)) {
	129	if (ep_comp) {
	130	num_req_streams = ep_comp->bmAttributes & 0x1f;
	131	if (num_req_streams > ep->max_streams)
	132	return 0;
a59d6b91 TB	133	}
	134
	135	}
	136
553fbcde JB	137	/*
	138	* If the protocol driver hasn't yet decided on wMaxPacketSize
	139	* and wants to know the maximum possible, provide the info.
	140	*/
	141	if (desc->wMaxPacketSize == 0)
	142	desc->wMaxPacketSize = cpu_to_le16(ep->maxpacket);
	143
1da177e4 LT	144	/* endpoint maxpacket size is an input parameter, except for bulk
	145	* where it's an output parameter representing the full speed limit.
	146	* the usb spec fixes high speed bulk maxpacket at 512 bytes.
	147	*/
29cc8897	148	max = 0x7ff & usb_endpoint_maxp(desc);
1da177e4 LT	149	switch (type) {
1da177e4 LT	150	case USB_ENDPOINT_XFER_INT:
bdb64d72	151	/* INT: limit 64 bytes full speed, 1024 high/super speed */
d327ab5b	152	if (!gadget_is_dualspeed(gadget) && max > 64)
1da177e4 LT	153	return 0;
	154	/* FALLTHROUGH */
	155
	156	case USB_ENDPOINT_XFER_ISOC:
bdb64d72	157	/* ISO: limit 1023 bytes full speed, 1024 high/super speed */
1da177e4 LT	158	if (ep->maxpacket < max)
1da177e4 LT	159	return 0;
d327ab5b	160	if (!gadget_is_dualspeed(gadget) && max > 1023)
1da177e4 LT	161	return 0;
	162
	163	/* BOTH: "high bandwidth" works only at high speed */
551509d2	164	if ((desc->wMaxPacketSize & cpu_to_le16(3<<11))) {
d327ab5b	165	if (!gadget_is_dualspeed(gadget))
1da177e4 LT	166	return 0;
	167	/* configure your hardware with enough buffering!! */
	168	}
	169	break;
	170	}
	171
	172	/* MATCH!! */
	173
	174	/* report address */
a4c39c41	175	desc->bEndpointAddress &= USB_DIR_IN;
1da177e4	176	if (isdigit (ep->name [2])) {
bb9496c6	177	u8 num = simple_strtoul (&ep->name [2], NULL, 10);
1da177e4 LT	178	desc->bEndpointAddress \|= num;
	179	#ifdef MANY_ENDPOINTS
	180	} else if (desc->bEndpointAddress & USB_DIR_IN) {
	181	if (++in_epnum > 15)
	182	return 0;
	183	desc->bEndpointAddress = USB_DIR_IN \| in_epnum;
	184	#endif
	185	} else {
	186	if (++epnum > 15)
	187	return 0;
	188	desc->bEndpointAddress \|= epnum;
	189	}
	190
	191	/* report (variable) full speed bulk maxpacket */
bdb64d72	192	if ((USB_ENDPOINT_XFER_BULK == type) && !ep_comp) {
1da177e4 LT	193	int size = ep->maxpacket;
	194
	195	/* min() doesn't work on bitfields with gcc-3.5 */
	196	if (size > 64)
	197	size = 64;
	198	desc->wMaxPacketSize = cpu_to_le16(size);
	199	}
48767a4e	200	ep->address = desc->bEndpointAddress;
1da177e4 LT	201	return 1;
	202	}
	203
28824b18	204	static struct usb_ep *
1da177e4 LT	205	find_ep (struct usb_gadget gadget, const char name)
	206	{
	207	struct usb_ep *ep;
	208
	209	list_for_each_entry (ep, &gadget->ep_list, ep_list) {
	210	if (0 == strcmp (ep->name, name))
	211	return ep;
	212	}
	213	return NULL;
	214	}
	215
	216	/**
a59d6b91 TB	217	* usb_ep_autoconfig_ss() - choose an endpoint matching the ep
a59d6b91 TB	218	* descriptor and ep companion descriptor
1da177e4 LT	219	* @gadget: The device to which the endpoint must belong.
1da177e4 LT	220	* @desc: Endpoint descriptor, with endpoint direction and transfer mode
a59d6b91 TB	221	* initialized. For periodic transfers, the maximum packet
	222	* size must also be initialized. This is modified on
	223	* success.
	224	* @ep_comp: Endpoint companion descriptor, with the required
	225	* number of streams. Will be modified when the chosen EP
	226	* supports a different number of streams.
1da177e4	227	*
a59d6b91 TB	228	* This routine replaces the usb_ep_autoconfig when needed
	229	* superspeed enhancments. If such enhancemnets are required,
	230	* the FD should call usb_ep_autoconfig_ss directly and provide
	231	* the additional ep_comp parameter.
	232	*
	233	* By choosing an endpoint to use with the specified descriptor,
	234	* this routine simplifies writing gadget drivers that work with
	235	* multiple USB device controllers. The endpoint would be
	236	* passed later to usb_ep_enable(), along with some descriptor.
1da177e4 LT	237	*
	238	* That second descriptor won't always be the same as the first one.
	239	* For example, isochronous endpoints can be autoconfigured for high
	240	* bandwidth, and then used in several lower bandwidth altsettings.
	241	* Also, high and full speed descriptors will be different.
	242	*
a59d6b91 TB	243	* Be sure to examine and test the results of autoconfiguration
	244	* on your hardware. This code may not make the best choices
	245	* about how to use the USB controller, and it can't know all
	246	* the restrictions that may apply. Some combinations of driver
	247	* and hardware won't be able to autoconfigure.
1da177e4 LT	248	*
	249	* On success, this returns an un-claimed usb_ep, and modifies the endpoint
	250	* descriptor bEndpointAddress. For bulk endpoints, the wMaxPacket value
a59d6b91 TB	251	* is initialized as if the endpoint were used at full speed and
	252	* the bmAttribute field in the ep companion descriptor is
	253	* updated with the assigned number of streams if it is
	254	* different from the original value. To prevent the endpoint
	255	* from being returned by a later autoconfig call, claim it by
	256	* assigning ep->driver_data to some non-null value.
1da177e4 LT	257	*
	258	* On failure, this returns a null endpoint descriptor.
	259	*/
a59d6b91	260	struct usb_ep *usb_ep_autoconfig_ss(
1da177e4	261	struct usb_gadget *gadget,
a59d6b91 TB	262	struct usb_endpoint_descriptor *desc,
a59d6b91 TB	263	struct usb_ss_ep_comp_descriptor *ep_comp
1da177e4 LT	264	)
	265	{
	266	struct usb_ep *ep;
	267	u8 type;
	268
	269	type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
	270
	271	/* First, apply chip-specific "best usage" knowledge.
	272	* This might make a good usb_gadget_ops hook ...
	273	*/
	274	if (gadget_is_net2280 (gadget) && type == USB_ENDPOINT_XFER_INT) {
	275	/* ep-e, ep-f are PIO with only 64 byte fifos */
	276	ep = find_ep (gadget, "ep-e");
a59d6b91	277	if (ep && ep_matches(gadget, ep, desc, ep_comp))
1da177e4 LT	278	return ep;
1da177e4 LT	279	ep = find_ep (gadget, "ep-f");
a59d6b91	280	if (ep && ep_matches(gadget, ep, desc, ep_comp))
1da177e4 LT	281	return ep;
	282
	283	} else if (gadget_is_goku (gadget)) {
	284	if (USB_ENDPOINT_XFER_INT == type) {
	285	/* single buffering is enough */
a59d6b91 TB	286	ep = find_ep(gadget, "ep3-bulk");
a59d6b91 TB	287	if (ep && ep_matches(gadget, ep, desc, ep_comp))
1da177e4 LT	288	return ep;
	289	} else if (USB_ENDPOINT_XFER_BULK == type
	290	&& (USB_DIR_IN & desc->bEndpointAddress)) {
	291	/* DMA may be available */
a59d6b91 TB	292	ep = find_ep(gadget, "ep2-bulk");
	293	if (ep && ep_matches(gadget, ep, desc,
	294	ep_comp))
1da177e4 LT	295	return ep;
	296	}
	297
3a8a3b1c	298	#ifdef CONFIG_BLACKFIN
f2984a33	299	} else if (gadget_is_musbhdrc(gadget)) {
3a8a3b1c BW	300	if ((USB_ENDPOINT_XFER_BULK == type) \|\|
	301	(USB_ENDPOINT_XFER_ISOC == type)) {
	302	if (USB_DIR_IN & desc->bEndpointAddress)
	303	ep = find_ep (gadget, "ep5in");
	304	else
	305	ep = find_ep (gadget, "ep6out");
767ffec1 CC	306	} else if (USB_ENDPOINT_XFER_INT == type) {
	307	if (USB_DIR_IN & desc->bEndpointAddress)
	308	ep = find_ep(gadget, "ep1in");
	309	else
	310	ep = find_ep(gadget, "ep2out");
3a8a3b1c BW	311	} else
3a8a3b1c BW	312	ep = NULL;
a59d6b91	313	if (ep && ep_matches(gadget, ep, desc, ep_comp))
3a8a3b1c BW	314	return ep;
3a8a3b1c BW	315	#endif
1da177e4 LT	316	}
1da177e4 LT	317
a353678d	318	/* Second, look at endpoints until an unclaimed one looks usable */
1da177e4	319	list_for_each_entry (ep, &gadget->ep_list, ep_list) {
a59d6b91	320	if (ep_matches(gadget, ep, desc, ep_comp))
1da177e4 LT	321	return ep;
	322	}
	323
	324	/* Fail */
	325	return NULL;
	326	}
	327
a59d6b91 TB	328	/**
	329	* usb_ep_autoconfig() - choose an endpoint matching the
	330	* descriptor
	331	* @gadget: The device to which the endpoint must belong.
	332	* @desc: Endpoint descriptor, with endpoint direction and transfer mode
	333	* initialized. For periodic transfers, the maximum packet
	334	* size must also be initialized. This is modified on success.
	335	*
	336	* By choosing an endpoint to use with the specified descriptor, this
	337	* routine simplifies writing gadget drivers that work with multiple
	338	* USB device controllers. The endpoint would be passed later to
	339	* usb_ep_enable(), along with some descriptor.
	340	*
	341	* That second descriptor won't always be the same as the first one.
	342	* For example, isochronous endpoints can be autoconfigured for high
	343	* bandwidth, and then used in several lower bandwidth altsettings.
	344	* Also, high and full speed descriptors will be different.
	345	*
	346	* Be sure to examine and test the results of autoconfiguration on your
	347	* hardware. This code may not make the best choices about how to use the
	348	* USB controller, and it can't know all the restrictions that may apply.
	349	* Some combinations of driver and hardware won't be able to autoconfigure.
	350	*
	351	* On success, this returns an un-claimed usb_ep, and modifies the endpoint
	352	* descriptor bEndpointAddress. For bulk endpoints, the wMaxPacket value
	353	* is initialized as if the endpoint were used at full speed. To prevent
	354	* the endpoint from being returned by a later autoconfig call, claim it
	355	* by assigning ep->driver_data to some non-null value.
	356	*
	357	* On failure, this returns a null endpoint descriptor.
	358	*/
	359	struct usb_ep *usb_ep_autoconfig(
	360	struct usb_gadget *gadget,
	361	struct usb_endpoint_descriptor *desc
	362	)
	363	{
	364	return usb_ep_autoconfig_ss(gadget, desc, NULL);
	365	}
	366
	367
1da177e4 LT	368	/**
	369	* usb_ep_autoconfig_reset - reset endpoint autoconfig state
	370	* @gadget: device for which autoconfig state will be reset
	371	*
	372	* Use this for devices where one configuration may need to assign
	373	* endpoint resources very differently from the next one. It clears
	374	* state such as ep->driver_data and the record of assigned endpoints
	375	* used by usb_ep_autoconfig().
	376	*/
28824b18	377	void usb_ep_autoconfig_reset (struct usb_gadget *gadget)
1da177e4 LT	378	{
	379	struct usb_ep *ep;
	380
	381	list_for_each_entry (ep, &gadget->ep_list, ep_list) {
	382	ep->driver_data = NULL;
	383	}
	384	#ifdef MANY_ENDPOINTS
	385	in_epnum = 0;
	386	#endif
	387	epnum = 0;
	388	}
	389