[deliverable/linux.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/module.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"

/*
 * 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 = usb_endpoint_type(desc);
	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 && gadget->max_speed >= USB_SPEED_SUPER) {
			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_limit);

	/* 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_limit < 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;
	} else if (desc->bEndpointAddress & USB_DIR_IN) {
		if (++gadget->in_epnum > 15)
			return 0;
		desc->bEndpointAddress = USB_DIR_IN | gadget->in_epnum;
	} else {
		if (++gadget->out_epnum > 15)
			return 0;
		desc->bEndpointAddress |= gadget->out_epnum;
	}

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

		/* 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))
			goto found_ep;
		ep = find_ep (gadget, "ep-f");
		if (ep && ep_matches(gadget, ep, desc, ep_comp))
			goto found_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))
				goto found_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))
				goto found_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))
			goto found_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))
			goto found_ep;
	}

	/* Fail */
	return NULL;
found_ep:
	ep->desc = NULL;
	ep->comp_desc = NULL;
	return ep;
}
EXPORT_SYMBOL_GPL(usb_ep_autoconfig_ss);

/**
 * 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);
}
EXPORT_SYMBOL_GPL(usb_ep_autoconfig);

/**
 * 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;
	}
	gadget->in_epnum = 0;
	gadget->out_epnum = 0;
}
EXPORT_SYMBOL_GPL(usb_ep_autoconfig_reset);
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>
dc995fc2	13	#include <linux/module.h>
1da177e4 LT	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
1da177e4 LT	25	/*
	26	* This should work with endpoints from controller drivers sharing the
	27	* same endpoint naming convention. By example:
	28	*
	29	* - ep1, ep2, ... address is fixed, not direction or type
	30	* - ep1in, ep2out, ... address and direction are fixed, not type
	31	* - ep1-bulk, ep2-bulk, ... address and type are fixed, not direction
	32	* - ep1in-bulk, ep2out-iso, ... all three are fixed
	33	* - ep-* ... no functionality restrictions
	34	*
	35	* Type suffixes are "-bulk", "-iso", or "-int". Numbers are decimal.
	36	* Less common restrictions are implied by gadget_is_*().
	37	*
	38	* NOTE: each endpoint is unidirectional, as specified by its USB
	39	* descriptor; and isn't specific to a configuration or altsetting.
	40	*/
28824b18	41	static int
1da177e4 LT	42	ep_matches (
	43	struct usb_gadget *gadget,
	44	struct usb_ep *ep,
a59d6b91 TB	45	struct usb_endpoint_descriptor *desc,
a59d6b91 TB	46	struct usb_ss_ep_comp_descriptor *ep_comp
1da177e4 LT	47	)
	48	{
	49	u8 type;
	50	const char *tmp;
	51	u16 max;
	52
a59d6b91 TB	53	int num_req_streams = 0;
a59d6b91 TB	54
1da177e4	55	/* endpoint already claimed? */
a9475226	56	if (NULL != ep->driver_data)
1da177e4	57	return 0;
a353678d	58
1da177e4	59	/* only support ep0 for portable CONTROL traffic */
c3505f04	60	type = usb_endpoint_type(desc);
1da177e4 LT	61	if (USB_ENDPOINT_XFER_CONTROL == type)
	62	return 0;
	63
	64	/* some other naming convention */
	65	if ('e' != ep->name[0])
	66	return 0;
	67
	68	/* type-restriction: "-iso", "-bulk", or "-int".
	69	* direction-restriction: "in", "out".
	70	*/
	71	if ('-' != ep->name[2]) {
	72	tmp = strrchr (ep->name, '-');
	73	if (tmp) {
	74	switch (type) {
	75	case USB_ENDPOINT_XFER_INT:
	76	/* bulk endpoints handle interrupt transfers,
	77	* except the toggle-quirky iso-synch kind
	78	*/
	79	if ('s' == tmp[2]) // == "-iso"
	80	return 0;
	81	/* for now, avoid PXA "interrupt-in";
	82	* it's documented as never using DATA1.
	83	*/
	84	if (gadget_is_pxa (gadget)
	85	&& 'i' == tmp [1])
	86	return 0;
	87	break;
	88	case USB_ENDPOINT_XFER_BULK:
	89	if ('b' != tmp[1]) // != "-bulk"
	90	return 0;
	91	break;
	92	case USB_ENDPOINT_XFER_ISOC:
	93	if ('s' != tmp[2]) // != "-iso"
	94	return 0;
	95	}
	96	} else {
	97	tmp = ep->name + strlen (ep->name);
	98	}
	99
	100	/* direction-restriction: "..in-..", "out-.." */
	101	tmp--;
	102	if (!isdigit (*tmp)) {
	103	if (desc->bEndpointAddress & USB_DIR_IN) {
	104	if ('n' != *tmp)
	105	return 0;
	106	} else {
	107	if ('t' != *tmp)
	108	return 0;
	109	}
	110	}
	111	}
	112
a59d6b91 TB	113	/*
	114	* Get the number of required streams from the EP companion
	115	* descriptor and see if the EP matches it
	116	*/
	117	if (usb_endpoint_xfer_bulk(desc)) {
c74c9300	118	if (ep_comp && gadget->max_speed >= USB_SPEED_SUPER) {
a59d6b91 TB	119	num_req_streams = ep_comp->bmAttributes & 0x1f;
	120	if (num_req_streams > ep->max_streams)
	121	return 0;
a59d6b91 TB	122	}
	123
	124	}
	125
553fbcde JB	126	/*
	127	* If the protocol driver hasn't yet decided on wMaxPacketSize
	128	* and wants to know the maximum possible, provide the info.
	129	*/
	130	if (desc->wMaxPacketSize == 0)
e117e742	131	desc->wMaxPacketSize = cpu_to_le16(ep->maxpacket_limit);
553fbcde	132
1da177e4 LT	133	/* endpoint maxpacket size is an input parameter, except for bulk
	134	* where it's an output parameter representing the full speed limit.
	135	* the usb spec fixes high speed bulk maxpacket at 512 bytes.
	136	*/
29cc8897	137	max = 0x7ff & usb_endpoint_maxp(desc);
1da177e4 LT	138	switch (type) {
1da177e4 LT	139	case USB_ENDPOINT_XFER_INT:
bdb64d72	140	/* INT: limit 64 bytes full speed, 1024 high/super speed */
d327ab5b	141	if (!gadget_is_dualspeed(gadget) && max > 64)
1da177e4 LT	142	return 0;
	143	/* FALLTHROUGH */
	144
	145	case USB_ENDPOINT_XFER_ISOC:
bdb64d72	146	/* ISO: limit 1023 bytes full speed, 1024 high/super speed */
e117e742	147	if (ep->maxpacket_limit < max)
1da177e4	148	return 0;
d327ab5b	149	if (!gadget_is_dualspeed(gadget) && max > 1023)
1da177e4 LT	150	return 0;
	151
	152	/* BOTH: "high bandwidth" works only at high speed */
551509d2	153	if ((desc->wMaxPacketSize & cpu_to_le16(3<<11))) {
d327ab5b	154	if (!gadget_is_dualspeed(gadget))
1da177e4 LT	155	return 0;
	156	/* configure your hardware with enough buffering!! */
	157	}
	158	break;
	159	}
	160
	161	/* MATCH!! */
	162
	163	/* report address */
a4c39c41	164	desc->bEndpointAddress &= USB_DIR_IN;
1da177e4	165	if (isdigit (ep->name [2])) {
bb9496c6	166	u8 num = simple_strtoul (&ep->name [2], NULL, 10);
1da177e4	167	desc->bEndpointAddress \|= num;
1da177e4	168	} else if (desc->bEndpointAddress & USB_DIR_IN) {
e87bb711	169	if (++gadget->in_epnum > 15)
1da177e4	170	return 0;
e87bb711	171	desc->bEndpointAddress = USB_DIR_IN \| gadget->in_epnum;
1da177e4	172	} else {
e87bb711	173	if (++gadget->out_epnum > 15)
1da177e4	174	return 0;
e87bb711	175	desc->bEndpointAddress \|= gadget->out_epnum;
1da177e4 LT	176	}
	177
	178	/* report (variable) full speed bulk maxpacket */
bdb64d72	179	if ((USB_ENDPOINT_XFER_BULK == type) && !ep_comp) {
e117e742	180	int size = ep->maxpacket_limit;
1da177e4 LT	181
	182	/* min() doesn't work on bitfields with gcc-3.5 */
	183	if (size > 64)
	184	size = 64;
	185	desc->wMaxPacketSize = cpu_to_le16(size);
	186	}
48767a4e	187	ep->address = desc->bEndpointAddress;
1da177e4 LT	188	return 1;
	189	}
	190
28824b18	191	static struct usb_ep *
1da177e4 LT	192	find_ep (struct usb_gadget gadget, const char name)
	193	{
	194	struct usb_ep *ep;
	195
	196	list_for_each_entry (ep, &gadget->ep_list, ep_list) {
	197	if (0 == strcmp (ep->name, name))
	198	return ep;
	199	}
	200	return NULL;
	201	}
	202
	203	/**
a59d6b91 TB	204	* usb_ep_autoconfig_ss() - choose an endpoint matching the ep
a59d6b91 TB	205	* descriptor and ep companion descriptor
1da177e4 LT	206	* @gadget: The device to which the endpoint must belong.
1da177e4 LT	207	* @desc: Endpoint descriptor, with endpoint direction and transfer mode
a59d6b91 TB	208	* initialized. For periodic transfers, the maximum packet
	209	* size must also be initialized. This is modified on
	210	* success.
	211	* @ep_comp: Endpoint companion descriptor, with the required
	212	* number of streams. Will be modified when the chosen EP
	213	* supports a different number of streams.
1da177e4	214	*
a59d6b91 TB	215	* This routine replaces the usb_ep_autoconfig when needed
	216	* superspeed enhancments. If such enhancemnets are required,
	217	* the FD should call usb_ep_autoconfig_ss directly and provide
	218	* the additional ep_comp parameter.
	219	*
	220	* By choosing an endpoint to use with the specified descriptor,
	221	* this routine simplifies writing gadget drivers that work with
	222	* multiple USB device controllers. The endpoint would be
	223	* passed later to usb_ep_enable(), along with some descriptor.
1da177e4 LT	224	*
	225	* That second descriptor won't always be the same as the first one.
	226	* For example, isochronous endpoints can be autoconfigured for high
	227	* bandwidth, and then used in several lower bandwidth altsettings.
	228	* Also, high and full speed descriptors will be different.
	229	*
a59d6b91 TB	230	* Be sure to examine and test the results of autoconfiguration
	231	* on your hardware. This code may not make the best choices
	232	* about how to use the USB controller, and it can't know all
	233	* the restrictions that may apply. Some combinations of driver
	234	* and hardware won't be able to autoconfigure.
1da177e4 LT	235	*
	236	* On success, this returns an un-claimed usb_ep, and modifies the endpoint
	237	* descriptor bEndpointAddress. For bulk endpoints, the wMaxPacket value
a59d6b91 TB	238	* is initialized as if the endpoint were used at full speed and
	239	* the bmAttribute field in the ep companion descriptor is
	240	* updated with the assigned number of streams if it is
	241	* different from the original value. To prevent the endpoint
	242	* from being returned by a later autoconfig call, claim it by
	243	* assigning ep->driver_data to some non-null value.
1da177e4 LT	244	*
	245	* On failure, this returns a null endpoint descriptor.
	246	*/
a59d6b91	247	struct usb_ep *usb_ep_autoconfig_ss(
1da177e4	248	struct usb_gadget *gadget,
a59d6b91 TB	249	struct usb_endpoint_descriptor *desc,
a59d6b91 TB	250	struct usb_ss_ep_comp_descriptor *ep_comp
1da177e4 LT	251	)
	252	{
	253	struct usb_ep *ep;
	254	u8 type;
	255
	256	type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
	257
	258	/* First, apply chip-specific "best usage" knowledge.
	259	* This might make a good usb_gadget_ops hook ...
	260	*/
	261	if (gadget_is_net2280 (gadget) && type == USB_ENDPOINT_XFER_INT) {
	262	/* ep-e, ep-f are PIO with only 64 byte fifos */
	263	ep = find_ep (gadget, "ep-e");
a59d6b91	264	if (ep && ep_matches(gadget, ep, desc, ep_comp))
609ca228	265	goto found_ep;
1da177e4	266	ep = find_ep (gadget, "ep-f");
a59d6b91	267	if (ep && ep_matches(gadget, ep, desc, ep_comp))
609ca228	268	goto found_ep;
1da177e4 LT	269
	270	} else if (gadget_is_goku (gadget)) {
	271	if (USB_ENDPOINT_XFER_INT == type) {
	272	/* single buffering is enough */
a59d6b91 TB	273	ep = find_ep(gadget, "ep3-bulk");
a59d6b91 TB	274	if (ep && ep_matches(gadget, ep, desc, ep_comp))
609ca228	275	goto found_ep;
1da177e4 LT	276	} else if (USB_ENDPOINT_XFER_BULK == type
	277	&& (USB_DIR_IN & desc->bEndpointAddress)) {
	278	/* DMA may be available */
a59d6b91 TB	279	ep = find_ep(gadget, "ep2-bulk");
	280	if (ep && ep_matches(gadget, ep, desc,
	281	ep_comp))
609ca228	282	goto found_ep;
1da177e4 LT	283	}
1da177e4 LT	284
3a8a3b1c	285	#ifdef CONFIG_BLACKFIN
f2984a33	286	} else if (gadget_is_musbhdrc(gadget)) {
3a8a3b1c BW	287	if ((USB_ENDPOINT_XFER_BULK == type) \|\|
	288	(USB_ENDPOINT_XFER_ISOC == type)) {
	289	if (USB_DIR_IN & desc->bEndpointAddress)
	290	ep = find_ep (gadget, "ep5in");
	291	else
	292	ep = find_ep (gadget, "ep6out");
767ffec1 CC	293	} else if (USB_ENDPOINT_XFER_INT == type) {
	294	if (USB_DIR_IN & desc->bEndpointAddress)
	295	ep = find_ep(gadget, "ep1in");
	296	else
	297	ep = find_ep(gadget, "ep2out");
3a8a3b1c BW	298	} else
3a8a3b1c BW	299	ep = NULL;
a59d6b91	300	if (ep && ep_matches(gadget, ep, desc, ep_comp))
609ca228	301	goto found_ep;
3a8a3b1c	302	#endif
1da177e4 LT	303	}
1da177e4 LT	304
a353678d	305	/* Second, look at endpoints until an unclaimed one looks usable */
1da177e4	306	list_for_each_entry (ep, &gadget->ep_list, ep_list) {
a59d6b91	307	if (ep_matches(gadget, ep, desc, ep_comp))
609ca228	308	goto found_ep;
1da177e4 LT	309	}
	310
	311	/* Fail */
	312	return NULL;
609ca228 SAS	313	found_ep:
	314	ep->desc = NULL;
	315	ep->comp_desc = NULL;
	316	return ep;
1da177e4	317	}
dc995fc2	318	EXPORT_SYMBOL_GPL(usb_ep_autoconfig_ss);
1da177e4	319
a59d6b91 TB	320	/**
	321	* usb_ep_autoconfig() - choose an endpoint matching the
	322	* descriptor
	323	* @gadget: The device to which the endpoint must belong.
	324	* @desc: Endpoint descriptor, with endpoint direction and transfer mode
	325	* initialized. For periodic transfers, the maximum packet
	326	* size must also be initialized. This is modified on success.
	327	*
	328	* By choosing an endpoint to use with the specified descriptor, this
	329	* routine simplifies writing gadget drivers that work with multiple
	330	* USB device controllers. The endpoint would be passed later to
	331	* usb_ep_enable(), along with some descriptor.
	332	*
	333	* That second descriptor won't always be the same as the first one.
	334	* For example, isochronous endpoints can be autoconfigured for high
	335	* bandwidth, and then used in several lower bandwidth altsettings.
	336	* Also, high and full speed descriptors will be different.
	337	*
	338	* Be sure to examine and test the results of autoconfiguration on your
	339	* hardware. This code may not make the best choices about how to use the
	340	* USB controller, and it can't know all the restrictions that may apply.
	341	* Some combinations of driver and hardware won't be able to autoconfigure.
	342	*
	343	* On success, this returns an un-claimed usb_ep, and modifies the endpoint
	344	* descriptor bEndpointAddress. For bulk endpoints, the wMaxPacket value
	345	* is initialized as if the endpoint were used at full speed. To prevent
	346	* the endpoint from being returned by a later autoconfig call, claim it
	347	* by assigning ep->driver_data to some non-null value.
	348	*
	349	* On failure, this returns a null endpoint descriptor.
	350	*/
	351	struct usb_ep *usb_ep_autoconfig(
	352	struct usb_gadget *gadget,
	353	struct usb_endpoint_descriptor *desc
	354	)
	355	{
	356	return usb_ep_autoconfig_ss(gadget, desc, NULL);
	357	}
dc995fc2	358	EXPORT_SYMBOL_GPL(usb_ep_autoconfig);
a59d6b91	359
1da177e4 LT	360	/**
	361	* usb_ep_autoconfig_reset - reset endpoint autoconfig state
	362	* @gadget: device for which autoconfig state will be reset
	363	*
	364	* Use this for devices where one configuration may need to assign
	365	* endpoint resources very differently from the next one. It clears
	366	* state such as ep->driver_data and the record of assigned endpoints
	367	* used by usb_ep_autoconfig().
	368	*/
28824b18	369	void usb_ep_autoconfig_reset (struct usb_gadget *gadget)
1da177e4 LT	370	{
	371	struct usb_ep *ep;
	372
	373	list_for_each_entry (ep, &gadget->ep_list, ep_list) {
	374	ep->driver_data = NULL;
	375	}
e87bb711 SAS	376	gadget->in_epnum = 0;
e87bb711 SAS	377	gadget->out_epnum = 0;
1da177e4	378	}
dc995fc2	379	EXPORT_SYMBOL_GPL(usb_ep_autoconfig_reset);