
Add missing information about license. Some people will probably want to reuse this code in their projects released under variety of licenses. For this reason this example is under Public Domain license to avoid GPL limitations. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Robert Baldyga <r.baldyga@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
366 lines
8.8 KiB
C
366 lines
8.8 KiB
C
/*
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* This is free and unencumbered software released into the public domain.
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*
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* Anyone is free to copy, modify, publish, use, compile, sell, or
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* distribute this software, either in source code form or as a compiled
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* binary, for any purpose, commercial or non-commercial, and by any
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* means.
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*
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* In jurisdictions that recognize copyright laws, the author or authors
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* of this software dedicate any and all copyright interest in the
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* software to the public domain. We make this dedication for the benefit
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* of the public at large and to the detriment of our heirs and
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* successors. We intend this dedication to be an overt act of
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* relinquishment in perpetuity of all present and future rights to this
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* software under copyright law.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* For more information, please refer to <http://unlicense.org/>
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*/
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#define _BSD_SOURCE /* for endian.h */
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#include <endian.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/poll.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <sys/eventfd.h>
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#include "libaio.h"
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#define IOCB_FLAG_RESFD (1 << 0)
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#include <linux/usb/functionfs.h>
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#define BUF_LEN 8192
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/******************** Descriptors and Strings *******************************/
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static const struct {
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struct usb_functionfs_descs_head_v2 header;
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__le32 fs_count;
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__le32 hs_count;
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struct {
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struct usb_interface_descriptor intf;
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struct usb_endpoint_descriptor_no_audio bulk_sink;
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struct usb_endpoint_descriptor_no_audio bulk_source;
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} __attribute__ ((__packed__)) fs_descs, hs_descs;
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} __attribute__ ((__packed__)) descriptors = {
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.header = {
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.magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
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.flags = htole32(FUNCTIONFS_HAS_FS_DESC |
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FUNCTIONFS_HAS_HS_DESC),
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.length = htole32(sizeof(descriptors)),
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},
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.fs_count = htole32(3),
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.fs_descs = {
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.intf = {
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.bLength = sizeof(descriptors.fs_descs.intf),
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.bDescriptorType = USB_DT_INTERFACE,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
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.iInterface = 1,
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},
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.bulk_sink = {
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.bLength = sizeof(descriptors.fs_descs.bulk_sink),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 1 | USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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},
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.bulk_source = {
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.bLength = sizeof(descriptors.fs_descs.bulk_source),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 2 | USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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},
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},
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.hs_count = htole32(3),
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.hs_descs = {
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.intf = {
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.bLength = sizeof(descriptors.hs_descs.intf),
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.bDescriptorType = USB_DT_INTERFACE,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
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.iInterface = 1,
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},
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.bulk_sink = {
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.bLength = sizeof(descriptors.hs_descs.bulk_sink),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 1 | USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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},
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.bulk_source = {
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.bLength = sizeof(descriptors.hs_descs.bulk_source),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 2 | USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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},
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},
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};
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#define STR_INTERFACE "AIO Test"
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static const struct {
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struct usb_functionfs_strings_head header;
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struct {
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__le16 code;
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const char str1[sizeof(STR_INTERFACE)];
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} __attribute__ ((__packed__)) lang0;
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} __attribute__ ((__packed__)) strings = {
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.header = {
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.magic = htole32(FUNCTIONFS_STRINGS_MAGIC),
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.length = htole32(sizeof(strings)),
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.str_count = htole32(1),
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.lang_count = htole32(1),
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},
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.lang0 = {
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htole16(0x0409), /* en-us */
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STR_INTERFACE,
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},
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};
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/******************** Endpoints handling *******************************/
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static void display_event(struct usb_functionfs_event *event)
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{
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static const char *const names[] = {
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[FUNCTIONFS_BIND] = "BIND",
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[FUNCTIONFS_UNBIND] = "UNBIND",
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[FUNCTIONFS_ENABLE] = "ENABLE",
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[FUNCTIONFS_DISABLE] = "DISABLE",
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[FUNCTIONFS_SETUP] = "SETUP",
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[FUNCTIONFS_SUSPEND] = "SUSPEND",
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[FUNCTIONFS_RESUME] = "RESUME",
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};
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switch (event->type) {
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case FUNCTIONFS_BIND:
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case FUNCTIONFS_UNBIND:
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case FUNCTIONFS_ENABLE:
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case FUNCTIONFS_DISABLE:
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case FUNCTIONFS_SETUP:
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case FUNCTIONFS_SUSPEND:
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case FUNCTIONFS_RESUME:
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printf("Event %s\n", names[event->type]);
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}
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}
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static void handle_ep0(int ep0, bool *ready)
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{
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struct usb_functionfs_event event;
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int ret;
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struct pollfd pfds[1];
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pfds[0].fd = ep0;
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pfds[0].events = POLLIN;
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ret = poll(pfds, 1, 0);
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if (ret && (pfds[0].revents & POLLIN)) {
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ret = read(ep0, &event, sizeof(event));
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if (!ret) {
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perror("unable to read event from ep0");
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return;
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}
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display_event(&event);
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switch (event.type) {
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case FUNCTIONFS_SETUP:
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if (event.u.setup.bRequestType & USB_DIR_IN)
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write(ep0, NULL, 0);
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else
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read(ep0, NULL, 0);
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break;
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case FUNCTIONFS_ENABLE:
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*ready = true;
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break;
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case FUNCTIONFS_DISABLE:
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*ready = false;
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break;
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default:
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break;
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}
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}
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}
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int main(int argc, char *argv[])
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{
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int i, ret;
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char *ep_path;
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int ep0;
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int ep[2];
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io_context_t ctx;
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int evfd;
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fd_set rfds;
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char *buf_in, *buf_out;
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struct iocb *iocb_in, *iocb_out;
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int req_in = 0, req_out = 0;
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bool ready;
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if (argc != 2) {
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printf("ffs directory not specified!\n");
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return 1;
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}
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ep_path = malloc(strlen(argv[1]) + 4 /* "/ep#" */ + 1 /* '\0' */);
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if (!ep_path) {
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perror("malloc");
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return 1;
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}
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/* open endpoint files */
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sprintf(ep_path, "%s/ep0", argv[1]);
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ep0 = open(ep_path, O_RDWR);
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if (ep0 < 0) {
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perror("unable to open ep0");
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return 1;
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}
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if (write(ep0, &descriptors, sizeof(descriptors)) < 0) {
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perror("unable do write descriptors");
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return 1;
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}
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if (write(ep0, &strings, sizeof(strings)) < 0) {
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perror("unable to write strings");
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return 1;
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}
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for (i = 0; i < 2; ++i) {
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sprintf(ep_path, "%s/ep%d", argv[1], i+1);
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ep[i] = open(ep_path, O_RDWR);
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if (ep[i] < 0) {
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printf("unable to open ep%d: %s\n", i+1,
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strerror(errno));
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return 1;
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}
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}
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free(ep_path);
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memset(&ctx, 0, sizeof(ctx));
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/* setup aio context to handle up to 2 requests */
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if (io_setup(2, &ctx) < 0) {
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perror("unable to setup aio");
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return 1;
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}
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evfd = eventfd(0, 0);
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if (evfd < 0) {
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perror("unable to open eventfd");
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return 1;
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}
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/* alloc buffers and requests */
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buf_in = malloc(BUF_LEN);
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buf_out = malloc(BUF_LEN);
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iocb_in = malloc(sizeof(*iocb_in));
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iocb_out = malloc(sizeof(*iocb_out));
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while (1) {
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FD_ZERO(&rfds);
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FD_SET(ep0, &rfds);
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FD_SET(evfd, &rfds);
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ret = select(((ep0 > evfd) ? ep0 : evfd)+1,
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&rfds, NULL, NULL, NULL);
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if (ret < 0) {
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if (errno == EINTR)
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continue;
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perror("select");
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break;
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}
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if (FD_ISSET(ep0, &rfds))
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handle_ep0(ep0, &ready);
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/* we are waiting for function ENABLE */
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if (!ready)
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continue;
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/* if something was submitted we wait for event */
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if (FD_ISSET(evfd, &rfds)) {
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uint64_t ev_cnt;
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ret = read(evfd, &ev_cnt, sizeof(ev_cnt));
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if (ret < 0) {
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perror("unable to read eventfd");
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break;
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}
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struct io_event e[2];
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/* we wait for one event */
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ret = io_getevents(ctx, 1, 2, e, NULL);
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/* if we got event */
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for (i = 0; i < ret; ++i) {
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if (e[i].obj->aio_fildes == ep[0]) {
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printf("ev=in; ret=%lu\n", e[i].res);
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req_in = 0;
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} else if (e[i].obj->aio_fildes == ep[1]) {
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printf("ev=out; ret=%lu\n", e[i].res);
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req_out = 0;
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}
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}
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}
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if (!req_in) { /* if IN transfer not requested*/
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/* prepare write request */
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io_prep_pwrite(iocb_in, ep[0], buf_in, BUF_LEN, 0);
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/* enable eventfd notification */
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iocb_in->u.c.flags |= IOCB_FLAG_RESFD;
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iocb_in->u.c.resfd = evfd;
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/* submit table of requests */
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ret = io_submit(ctx, 1, &iocb_in);
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if (ret >= 0) { /* if ret > 0 request is queued */
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req_in = 1;
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printf("submit: in\n");
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} else
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perror("unable to submit request");
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}
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if (!req_out) { /* if OUT transfer not requested */
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/* prepare read request */
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io_prep_pread(iocb_out, ep[1], buf_out, BUF_LEN, 0);
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/* enable eventfs notification */
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iocb_out->u.c.flags |= IOCB_FLAG_RESFD;
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iocb_out->u.c.resfd = evfd;
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/* submit table of requests */
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ret = io_submit(ctx, 1, &iocb_out);
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if (ret >= 0) { /* if ret > 0 request is queued */
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req_out = 1;
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printf("submit: out\n");
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} else
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perror("unable to submit request");
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}
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}
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/* free resources */
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io_destroy(ctx);
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free(buf_in);
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free(buf_out);
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free(iocb_in);
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free(iocb_out);
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for (i = 0; i < 2; ++i)
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close(ep[i]);
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close(ep0);
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return 0;
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}
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