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https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 09:08:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
379
drivers/usb/gadget/epautoconf.c
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379
drivers/usb/gadget/epautoconf.c
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/*
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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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#include <linux/kernel.h>
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#include <linux/module.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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/*
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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
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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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struct usb_ss_ep_comp_descriptor *ep_comp
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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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int num_req_streams = 0;
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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 = usb_endpoint_type(desc);
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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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/*
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* Get the number of required streams from the EP companion
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* descriptor and see if the EP matches it
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*/
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if (usb_endpoint_xfer_bulk(desc)) {
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if (ep_comp && gadget->max_speed >= USB_SPEED_SUPER) {
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num_req_streams = ep_comp->bmAttributes & 0x1f;
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if (num_req_streams > ep->max_streams)
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return 0;
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}
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}
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/*
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* If the protocol driver hasn't yet decided on wMaxPacketSize
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* and wants to know the maximum possible, provide the info.
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*/
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if (desc->wMaxPacketSize == 0)
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desc->wMaxPacketSize = cpu_to_le16(ep->maxpacket_limit);
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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 & usb_endpoint_maxp(desc);
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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/super speed */
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if (!gadget_is_dualspeed(gadget) && 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/super speed */
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if (ep->maxpacket_limit < max)
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return 0;
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if (!gadget_is_dualspeed(gadget) && 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 & cpu_to_le16(3<<11))) {
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if (!gadget_is_dualspeed(gadget))
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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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desc->bEndpointAddress &= USB_DIR_IN;
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if (isdigit (ep->name [2])) {
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u8 num = simple_strtoul (&ep->name [2], NULL, 10);
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desc->bEndpointAddress |= num;
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} else if (desc->bEndpointAddress & USB_DIR_IN) {
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if (++gadget->in_epnum > 15)
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return 0;
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desc->bEndpointAddress = USB_DIR_IN | gadget->in_epnum;
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} else {
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if (++gadget->out_epnum > 15)
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return 0;
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desc->bEndpointAddress |= gadget->out_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) && !ep_comp) {
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int size = ep->maxpacket_limit;
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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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ep->address = desc->bEndpointAddress;
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return 1;
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}
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static struct usb_ep *
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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_ss() - choose an endpoint matching the ep
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* descriptor and ep companion 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
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* success.
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* @ep_comp: Endpoint companion descriptor, with the required
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* number of streams. Will be modified when the chosen EP
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* supports a different number of streams.
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*
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* This routine replaces the usb_ep_autoconfig when needed
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* superspeed enhancments. If such enhancemnets are required,
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* the FD should call usb_ep_autoconfig_ss directly and provide
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* the additional ep_comp parameter.
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*
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* By choosing an endpoint to use with the specified descriptor,
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* this routine simplifies writing gadget drivers that work with
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* multiple USB device controllers. The endpoint would be
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* passed later to 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
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* on your hardware. This code may not make the best choices
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* about how to use the USB controller, and it can't know all
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* the restrictions that may apply. Some combinations of driver
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* 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 and
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* the bmAttribute field in the ep companion descriptor is
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* updated with the assigned number of streams if it is
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* different from the original value. To prevent the endpoint
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* from being returned by a later autoconfig call, claim it by
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* 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 *usb_ep_autoconfig_ss(
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struct usb_gadget *gadget,
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struct usb_endpoint_descriptor *desc,
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struct usb_ss_ep_comp_descriptor *ep_comp
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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, ep_comp))
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goto found_ep;
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ep = find_ep (gadget, "ep-f");
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if (ep && ep_matches(gadget, ep, desc, ep_comp))
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goto found_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, ep_comp))
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goto found_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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ep_comp))
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goto found_ep;
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}
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#ifdef CONFIG_BLACKFIN
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} else if (gadget_is_musbhdrc(gadget)) {
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if ((USB_ENDPOINT_XFER_BULK == type) ||
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(USB_ENDPOINT_XFER_ISOC == type)) {
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if (USB_DIR_IN & desc->bEndpointAddress)
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ep = find_ep (gadget, "ep5in");
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else
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ep = find_ep (gadget, "ep6out");
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} else if (USB_ENDPOINT_XFER_INT == type) {
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if (USB_DIR_IN & desc->bEndpointAddress)
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ep = find_ep(gadget, "ep1in");
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else
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ep = find_ep(gadget, "ep2out");
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} else
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ep = NULL;
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if (ep && ep_matches(gadget, ep, desc, ep_comp))
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goto found_ep;
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#endif
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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, ep_comp))
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goto found_ep;
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}
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/* Fail */
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return NULL;
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found_ep:
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ep->desc = NULL;
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ep->comp_desc = NULL;
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return ep;
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}
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EXPORT_SYMBOL_GPL(usb_ep_autoconfig_ss);
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/**
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* usb_ep_autoconfig() - choose an endpoint matching the
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* 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 *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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return usb_ep_autoconfig_ss(gadget, desc, NULL);
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}
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EXPORT_SYMBOL_GPL(usb_ep_autoconfig);
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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 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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gadget->in_epnum = 0;
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gadget->out_epnum = 0;
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}
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EXPORT_SYMBOL_GPL(usb_ep_autoconfig_reset);
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