311 lines
8.9 KiB
C
311 lines
8.9 KiB
C
/*
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* epautoconf.c -- endpoint autoconfiguration for usb gadget drivers
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*
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* Copyright (C) 2004 David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/ctype.h>
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#include <linux/string.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb_gadget.h>
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#include "gadget_chips.h"
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/* we must assign addresses for configurable endpoints (like net2280) */
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static __devinitdata unsigned epnum;
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// #define MANY_ENDPOINTS
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#ifdef MANY_ENDPOINTS
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/* more than 15 configurable endpoints */
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static __devinitdata unsigned in_epnum;
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#endif
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/*
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* This should work with endpoints from controller drivers sharing the
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* same endpoint naming convention. By example:
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*
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* - ep1, ep2, ... address is fixed, not direction or type
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* - ep1in, ep2out, ... address and direction are fixed, not type
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* - ep1-bulk, ep2-bulk, ... address and type are fixed, not direction
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* - ep1in-bulk, ep2out-iso, ... all three are fixed
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* - ep-* ... no functionality restrictions
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*
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* Type suffixes are "-bulk", "-iso", or "-int". Numbers are decimal.
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* Less common restrictions are implied by gadget_is_*().
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*
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* NOTE: each endpoint is unidirectional, as specified by its USB
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* descriptor; and isn't specific to a configuration or altsetting.
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*/
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static int __devinit
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ep_matches (
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struct usb_gadget *gadget,
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struct usb_ep *ep,
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struct usb_endpoint_descriptor *desc
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)
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{
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u8 type;
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const char *tmp;
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u16 max;
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/* endpoint already claimed? */
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if (NULL != ep->driver_data)
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return 0;
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/* only support ep0 for portable CONTROL traffic */
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type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
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if (USB_ENDPOINT_XFER_CONTROL == type)
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return 0;
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/* some other naming convention */
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if ('e' != ep->name[0])
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return 0;
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/* type-restriction: "-iso", "-bulk", or "-int".
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* direction-restriction: "in", "out".
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*/
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if ('-' != ep->name[2]) {
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tmp = strrchr (ep->name, '-');
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if (tmp) {
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switch (type) {
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case USB_ENDPOINT_XFER_INT:
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/* bulk endpoints handle interrupt transfers,
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* except the toggle-quirky iso-synch kind
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*/
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if ('s' == tmp[2]) // == "-iso"
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return 0;
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/* for now, avoid PXA "interrupt-in";
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* it's documented as never using DATA1.
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*/
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if (gadget_is_pxa (gadget)
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&& 'i' == tmp [1])
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return 0;
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break;
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case USB_ENDPOINT_XFER_BULK:
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if ('b' != tmp[1]) // != "-bulk"
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return 0;
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break;
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case USB_ENDPOINT_XFER_ISOC:
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if ('s' != tmp[2]) // != "-iso"
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return 0;
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}
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} else {
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tmp = ep->name + strlen (ep->name);
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}
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/* direction-restriction: "..in-..", "out-.." */
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tmp--;
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if (!isdigit (*tmp)) {
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if (desc->bEndpointAddress & USB_DIR_IN) {
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if ('n' != *tmp)
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return 0;
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} else {
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if ('t' != *tmp)
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return 0;
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}
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}
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}
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/* endpoint maxpacket size is an input parameter, except for bulk
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* where it's an output parameter representing the full speed limit.
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* the usb spec fixes high speed bulk maxpacket at 512 bytes.
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*/
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max = 0x7ff & le16_to_cpu(desc->wMaxPacketSize);
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switch (type) {
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case USB_ENDPOINT_XFER_INT:
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/* INT: limit 64 bytes full speed, 1024 high speed */
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if (!gadget->is_dualspeed && max > 64)
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return 0;
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/* FALLTHROUGH */
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case USB_ENDPOINT_XFER_ISOC:
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/* ISO: limit 1023 bytes full speed, 1024 high speed */
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if (ep->maxpacket < max)
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return 0;
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if (!gadget->is_dualspeed && max > 1023)
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return 0;
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/* BOTH: "high bandwidth" works only at high speed */
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if ((desc->wMaxPacketSize & __constant_cpu_to_le16(3<<11))) {
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if (!gadget->is_dualspeed)
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return 0;
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/* configure your hardware with enough buffering!! */
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}
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break;
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}
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/* MATCH!! */
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/* report address */
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if (isdigit (ep->name [2])) {
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u8 num = simple_strtol (&ep->name [2], NULL, 10);
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desc->bEndpointAddress |= num;
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#ifdef MANY_ENDPOINTS
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} else if (desc->bEndpointAddress & USB_DIR_IN) {
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if (++in_epnum > 15)
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return 0;
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desc->bEndpointAddress = USB_DIR_IN | in_epnum;
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#endif
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} else {
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if (++epnum > 15)
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return 0;
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desc->bEndpointAddress |= epnum;
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}
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/* report (variable) full speed bulk maxpacket */
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if (USB_ENDPOINT_XFER_BULK == type) {
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int size = ep->maxpacket;
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/* min() doesn't work on bitfields with gcc-3.5 */
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if (size > 64)
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size = 64;
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desc->wMaxPacketSize = cpu_to_le16(size);
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}
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return 1;
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}
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static struct usb_ep * __devinit
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find_ep (struct usb_gadget *gadget, const char *name)
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{
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struct usb_ep *ep;
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list_for_each_entry (ep, &gadget->ep_list, ep_list) {
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if (0 == strcmp (ep->name, name))
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return ep;
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}
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return NULL;
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}
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/**
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* usb_ep_autoconfig - choose an endpoint matching the descriptor
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* @gadget: The device to which the endpoint must belong.
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* @desc: Endpoint descriptor, with endpoint direction and transfer mode
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* initialized. For periodic transfers, the maximum packet
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* size must also be initialized. This is modified on success.
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*
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* By choosing an endpoint to use with the specified descriptor, this
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* routine simplifies writing gadget drivers that work with multiple
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* USB device controllers. The endpoint would be passed later to
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* usb_ep_enable(), along with some descriptor.
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*
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* That second descriptor won't always be the same as the first one.
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* For example, isochronous endpoints can be autoconfigured for high
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* bandwidth, and then used in several lower bandwidth altsettings.
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* Also, high and full speed descriptors will be different.
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*
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* Be sure to examine and test the results of autoconfiguration on your
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* hardware. This code may not make the best choices about how to use the
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* USB controller, and it can't know all the restrictions that may apply.
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* Some combinations of driver and hardware won't be able to autoconfigure.
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*
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* On success, this returns an un-claimed usb_ep, and modifies the endpoint
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* descriptor bEndpointAddress. For bulk endpoints, the wMaxPacket value
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* is initialized as if the endpoint were used at full speed. To prevent
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* the endpoint from being returned by a later autoconfig call, claim it
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* by assigning ep->driver_data to some non-null value.
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*
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* On failure, this returns a null endpoint descriptor.
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*/
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struct usb_ep * __devinit usb_ep_autoconfig (
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struct usb_gadget *gadget,
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struct usb_endpoint_descriptor *desc
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)
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{
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struct usb_ep *ep;
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u8 type;
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type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
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/* First, apply chip-specific "best usage" knowledge.
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* This might make a good usb_gadget_ops hook ...
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*/
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if (gadget_is_net2280 (gadget) && type == USB_ENDPOINT_XFER_INT) {
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/* ep-e, ep-f are PIO with only 64 byte fifos */
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ep = find_ep (gadget, "ep-e");
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if (ep && ep_matches (gadget, ep, desc))
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return ep;
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ep = find_ep (gadget, "ep-f");
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if (ep && ep_matches (gadget, ep, desc))
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return ep;
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} else if (gadget_is_goku (gadget)) {
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if (USB_ENDPOINT_XFER_INT == type) {
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/* single buffering is enough */
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ep = find_ep (gadget, "ep3-bulk");
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if (ep && ep_matches (gadget, ep, desc))
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return ep;
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} else if (USB_ENDPOINT_XFER_BULK == type
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&& (USB_DIR_IN & desc->bEndpointAddress)) {
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/* DMA may be available */
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ep = find_ep (gadget, "ep2-bulk");
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if (ep && ep_matches (gadget, ep, desc))
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return ep;
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}
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} else if (gadget_is_sh (gadget) && USB_ENDPOINT_XFER_INT == type) {
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/* single buffering is enough; maybe 8 byte fifo is too */
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ep = find_ep (gadget, "ep3in-bulk");
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if (ep && ep_matches (gadget, ep, desc))
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return ep;
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} else if (gadget_is_mq11xx (gadget) && USB_ENDPOINT_XFER_INT == type) {
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ep = find_ep (gadget, "ep1-bulk");
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if (ep && ep_matches (gadget, ep, desc))
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return ep;
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}
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/* Second, look at endpoints until an unclaimed one looks usable */
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list_for_each_entry (ep, &gadget->ep_list, ep_list) {
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if (ep_matches (gadget, ep, desc))
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return ep;
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}
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/* Fail */
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return NULL;
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}
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/**
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* usb_ep_autoconfig_reset - reset endpoint autoconfig state
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* @gadget: device for which autoconfig state will be reset
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*
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* Use this for devices where one configuration may need to assign
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* endpoint resources very differently from the next one. It clears
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* state such as ep->driver_data and the record of assigned endpoints
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* used by usb_ep_autoconfig().
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*/
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void __devinit usb_ep_autoconfig_reset (struct usb_gadget *gadget)
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{
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struct usb_ep *ep;
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list_for_each_entry (ep, &gadget->ep_list, ep_list) {
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ep->driver_data = NULL;
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}
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#ifdef MANY_ENDPOINTS
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in_epnum = 0;
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#endif
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epnum = 0;
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}
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