682 lines
16 KiB
C
682 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ffs-test.c -- user mode filesystem api for usb composite function
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*
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* Copyright (C) 2010 Samsung Electronics
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* Author: Michal Nazarewicz <mina86@mina86.com>
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*/
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/* $(CROSS_COMPILE)cc -Wall -Wextra -g -o ffs-test ffs-test.c -lpthread */
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#define _DEFAULT_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 <pthread.h>
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#include <stdarg.h>
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#include <stdbool.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 <unistd.h>
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#include <tools/le_byteshift.h>
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#include "../../include/uapi/linux/usb/functionfs.h"
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/******************** Little Endian Handling ********************************/
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/*
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* cpu_to_le16/32 are used when initializing structures, a context where a
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* function call is not allowed. To solve this, we code cpu_to_le16/32 in a way
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* that allows them to be used when initializing structures.
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*/
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define cpu_to_le16(x) (x)
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#define cpu_to_le32(x) (x)
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#else
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#define cpu_to_le16(x) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
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#define cpu_to_le32(x) \
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((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \
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(((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
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#endif
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#define le32_to_cpu(x) le32toh(x)
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#define le16_to_cpu(x) le16toh(x)
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/******************** Messages and Errors ***********************************/
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static const char argv0[] = "ffs-test";
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static unsigned verbosity = 7;
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static void _msg(unsigned level, const char *fmt, ...)
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{
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if (level < 2)
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level = 2;
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else if (level > 7)
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level = 7;
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if (level <= verbosity) {
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static const char levels[8][6] = {
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[2] = "crit:",
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[3] = "err: ",
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[4] = "warn:",
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[5] = "note:",
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[6] = "info:",
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[7] = "dbg: "
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};
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int _errno = errno;
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va_list ap;
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fprintf(stderr, "%s: %s ", argv0, levels[level]);
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (fmt[strlen(fmt) - 1] != '\n') {
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char buffer[128];
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strerror_r(_errno, buffer, sizeof buffer);
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fprintf(stderr, ": (-%d) %s\n", _errno, buffer);
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}
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fflush(stderr);
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}
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}
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#define die(...) (_msg(2, __VA_ARGS__), exit(1))
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#define err(...) _msg(3, __VA_ARGS__)
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#define warn(...) _msg(4, __VA_ARGS__)
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#define note(...) _msg(5, __VA_ARGS__)
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#define info(...) _msg(6, __VA_ARGS__)
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#define debug(...) _msg(7, __VA_ARGS__)
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#define die_on(cond, ...) do { \
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if (cond) \
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die(__VA_ARGS__); \
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} while (0)
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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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__le32 ss_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 sink;
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struct usb_endpoint_descriptor_no_audio source;
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} __attribute__((packed)) fs_descs, hs_descs;
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struct {
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struct usb_interface_descriptor intf;
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struct usb_endpoint_descriptor_no_audio sink;
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struct usb_ss_ep_comp_descriptor sink_comp;
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struct usb_endpoint_descriptor_no_audio source;
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struct usb_ss_ep_comp_descriptor source_comp;
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} ss_descs;
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} __attribute__((packed)) descriptors = {
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.header = {
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.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
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.flags = cpu_to_le32(FUNCTIONFS_HAS_FS_DESC |
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FUNCTIONFS_HAS_HS_DESC |
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FUNCTIONFS_HAS_SS_DESC),
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.length = cpu_to_le32(sizeof descriptors),
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},
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.fs_count = cpu_to_le32(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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.sink = {
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.bLength = sizeof descriptors.fs_descs.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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/* .wMaxPacketSize = autoconfiguration (kernel) */
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},
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.source = {
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.bLength = sizeof descriptors.fs_descs.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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/* .wMaxPacketSize = autoconfiguration (kernel) */
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},
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},
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.hs_count = cpu_to_le32(3),
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.hs_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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.sink = {
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.bLength = sizeof descriptors.hs_descs.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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.wMaxPacketSize = cpu_to_le16(512),
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},
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.source = {
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.bLength = sizeof descriptors.hs_descs.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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.wMaxPacketSize = cpu_to_le16(512),
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.bInterval = 1, /* NAK every 1 uframe */
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},
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},
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.ss_count = cpu_to_le32(5),
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.ss_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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.sink = {
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.bLength = sizeof descriptors.hs_descs.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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.wMaxPacketSize = cpu_to_le16(1024),
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},
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.sink_comp = {
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.bLength = USB_DT_SS_EP_COMP_SIZE,
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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.bMaxBurst = 0,
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.bmAttributes = 0,
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.wBytesPerInterval = 0,
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},
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.source = {
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.bLength = sizeof descriptors.hs_descs.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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.wMaxPacketSize = cpu_to_le16(1024),
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.bInterval = 1, /* NAK every 1 uframe */
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},
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.source_comp = {
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.bLength = USB_DT_SS_EP_COMP_SIZE,
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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.bMaxBurst = 0,
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.bmAttributes = 0,
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.wBytesPerInterval = 0,
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},
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},
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};
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static size_t descs_to_legacy(void **legacy, const void *descriptors_v2)
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{
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const unsigned char *descs_end, *descs_start;
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__u32 length, fs_count = 0, hs_count = 0, count;
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/* Read v2 header */
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{
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const struct {
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const struct usb_functionfs_descs_head_v2 header;
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const __le32 counts[];
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} __attribute__((packed)) *const in = descriptors_v2;
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const __le32 *counts = in->counts;
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__u32 flags;
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if (le32_to_cpu(in->header.magic) !=
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FUNCTIONFS_DESCRIPTORS_MAGIC_V2)
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return 0;
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length = le32_to_cpu(in->header.length);
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if (length <= sizeof in->header)
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return 0;
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length -= sizeof in->header;
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flags = le32_to_cpu(in->header.flags);
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if (flags & ~(FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
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FUNCTIONFS_HAS_SS_DESC))
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return 0;
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#define GET_NEXT_COUNT_IF_FLAG(ret, flg) do { \
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if (!(flags & (flg))) \
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break; \
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if (length < 4) \
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return 0; \
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ret = le32_to_cpu(*counts); \
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length -= 4; \
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++counts; \
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} while (0)
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GET_NEXT_COUNT_IF_FLAG(fs_count, FUNCTIONFS_HAS_FS_DESC);
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GET_NEXT_COUNT_IF_FLAG(hs_count, FUNCTIONFS_HAS_HS_DESC);
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GET_NEXT_COUNT_IF_FLAG(count, FUNCTIONFS_HAS_SS_DESC);
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count = fs_count + hs_count;
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if (!count)
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return 0;
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descs_start = (const void *)counts;
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#undef GET_NEXT_COUNT_IF_FLAG
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}
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/*
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* Find the end of FS and HS USB descriptors. SS descriptors
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* are ignored since legacy format does not support them.
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*/
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descs_end = descs_start;
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do {
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if (length < *descs_end)
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return 0;
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length -= *descs_end;
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descs_end += *descs_end;
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} while (--count);
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/* Allocate legacy descriptors and copy the data. */
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{
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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struct {
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struct usb_functionfs_descs_head header;
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__u8 descriptors[];
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} __attribute__((packed)) *out;
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#pragma GCC diagnostic pop
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length = sizeof out->header + (descs_end - descs_start);
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out = malloc(length);
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out->header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC);
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out->header.length = cpu_to_le32(length);
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out->header.fs_count = cpu_to_le32(fs_count);
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out->header.hs_count = cpu_to_le32(hs_count);
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memcpy(out->descriptors, descs_start, descs_end - descs_start);
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*legacy = out;
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}
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return length;
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}
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#define STR_INTERFACE_ "Source/Sink"
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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 = cpu_to_le32(FUNCTIONFS_STRINGS_MAGIC),
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.length = cpu_to_le32(sizeof strings),
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.str_count = cpu_to_le32(1),
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.lang_count = cpu_to_le32(1),
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},
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.lang0 = {
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cpu_to_le16(0x0409), /* en-us */
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STR_INTERFACE_,
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},
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};
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#define STR_INTERFACE strings.lang0.str1
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/******************** Files and Threads Handling ****************************/
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struct thread;
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static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes);
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static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes);
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static ssize_t ep0_consume(struct thread *t, const void *buf, size_t nbytes);
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static ssize_t fill_in_buf(struct thread *t, void *buf, size_t nbytes);
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static ssize_t empty_out_buf(struct thread *t, const void *buf, size_t nbytes);
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static struct thread {
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const char *const filename;
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size_t buf_size;
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ssize_t (*in)(struct thread *, void *, size_t);
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const char *const in_name;
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ssize_t (*out)(struct thread *, const void *, size_t);
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const char *const out_name;
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int fd;
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pthread_t id;
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void *buf;
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ssize_t status;
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} threads[] = {
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{
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"ep0", 4 * sizeof(struct usb_functionfs_event),
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read_wrap, NULL,
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ep0_consume, "<consume>",
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0, 0, NULL, 0
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},
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{
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"ep1", 8 * 1024,
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fill_in_buf, "<in>",
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write_wrap, NULL,
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0, 0, NULL, 0
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},
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{
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"ep2", 8 * 1024,
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read_wrap, NULL,
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empty_out_buf, "<out>",
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0, 0, NULL, 0
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},
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};
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static void init_thread(struct thread *t)
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{
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t->buf = malloc(t->buf_size);
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die_on(!t->buf, "malloc");
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t->fd = open(t->filename, O_RDWR);
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die_on(t->fd < 0, "%s", t->filename);
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}
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static void cleanup_thread(void *arg)
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{
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struct thread *t = arg;
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int ret, fd;
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fd = t->fd;
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if (t->fd < 0)
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return;
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t->fd = -1;
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/* test the FIFO ioctls (non-ep0 code paths) */
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if (t != threads) {
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ret = ioctl(fd, FUNCTIONFS_FIFO_STATUS);
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if (ret < 0) {
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/* ENODEV reported after disconnect */
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if (errno != ENODEV)
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err("%s: get fifo status", t->filename);
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} else if (ret) {
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warn("%s: unclaimed = %d\n", t->filename, ret);
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if (ioctl(fd, FUNCTIONFS_FIFO_FLUSH) < 0)
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err("%s: fifo flush", t->filename);
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}
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}
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if (close(fd) < 0)
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err("%s: close", t->filename);
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free(t->buf);
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t->buf = NULL;
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}
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static void *start_thread_helper(void *arg)
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{
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const char *name, *op, *in_name, *out_name;
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struct thread *t = arg;
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ssize_t ret;
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info("%s: starts\n", t->filename);
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in_name = t->in_name ? t->in_name : t->filename;
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out_name = t->out_name ? t->out_name : t->filename;
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pthread_cleanup_push(cleanup_thread, arg);
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for (;;) {
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pthread_testcancel();
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ret = t->in(t, t->buf, t->buf_size);
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if (ret > 0) {
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ret = t->out(t, t->buf, ret);
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name = out_name;
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op = "write";
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} else {
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name = in_name;
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op = "read";
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}
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if (ret > 0) {
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/* nop */
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} else if (!ret) {
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debug("%s: %s: EOF", name, op);
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break;
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} else if (errno == EINTR || errno == EAGAIN) {
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debug("%s: %s", name, op);
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} else {
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warn("%s: %s", name, op);
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break;
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}
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}
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pthread_cleanup_pop(1);
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t->status = ret;
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info("%s: ends\n", t->filename);
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return NULL;
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}
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static void start_thread(struct thread *t)
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{
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debug("%s: starting\n", t->filename);
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die_on(pthread_create(&t->id, NULL, start_thread_helper, t) < 0,
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"pthread_create(%s)", t->filename);
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}
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static void join_thread(struct thread *t)
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{
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int ret = pthread_join(t->id, NULL);
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if (ret < 0)
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err("%s: joining thread", t->filename);
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else
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debug("%s: joined\n", t->filename);
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}
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static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes)
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{
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return read(t->fd, buf, nbytes);
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}
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static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes)
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{
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return write(t->fd, buf, nbytes);
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}
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/******************** Empty/Fill buffer routines ****************************/
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/* 0 -- stream of zeros, 1 -- i % 63, 2 -- pipe */
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enum pattern { PAT_ZERO, PAT_SEQ, PAT_PIPE };
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static enum pattern pattern;
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static ssize_t
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fill_in_buf(struct thread *ignore, void *buf, size_t nbytes)
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{
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size_t i;
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__u8 *p;
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(void)ignore;
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switch (pattern) {
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case PAT_ZERO:
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memset(buf, 0, nbytes);
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break;
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case PAT_SEQ:
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for (p = buf, i = 0; i < nbytes; ++i, ++p)
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*p = i % 63;
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break;
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case PAT_PIPE:
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return fread(buf, 1, nbytes, stdin);
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}
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return nbytes;
|
|
}
|
|
|
|
static ssize_t
|
|
empty_out_buf(struct thread *ignore, const void *buf, size_t nbytes)
|
|
{
|
|
const __u8 *p;
|
|
__u8 expected;
|
|
ssize_t ret;
|
|
size_t len;
|
|
|
|
(void)ignore;
|
|
|
|
switch (pattern) {
|
|
case PAT_ZERO:
|
|
expected = 0;
|
|
for (p = buf, len = 0; len < nbytes; ++p, ++len)
|
|
if (*p)
|
|
goto invalid;
|
|
break;
|
|
|
|
case PAT_SEQ:
|
|
for (p = buf, len = 0; len < nbytes; ++p, ++len)
|
|
if (*p != len % 63) {
|
|
expected = len % 63;
|
|
goto invalid;
|
|
}
|
|
break;
|
|
|
|
case PAT_PIPE:
|
|
ret = fwrite(buf, nbytes, 1, stdout);
|
|
if (ret > 0)
|
|
fflush(stdout);
|
|
break;
|
|
|
|
invalid:
|
|
err("bad OUT byte %zd, expected %02x got %02x\n",
|
|
len, expected, *p);
|
|
for (p = buf, len = 0; len < nbytes; ++p, ++len) {
|
|
if (0 == (len % 32))
|
|
fprintf(stderr, "%4zd:", len);
|
|
fprintf(stderr, " %02x", *p);
|
|
if (31 == (len % 32))
|
|
fprintf(stderr, "\n");
|
|
}
|
|
fflush(stderr);
|
|
errno = EILSEQ;
|
|
return -1;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
|
|
/******************** Endpoints routines ************************************/
|
|
|
|
static void handle_setup(const struct usb_ctrlrequest *setup)
|
|
{
|
|
printf("bRequestType = %d\n", setup->bRequestType);
|
|
printf("bRequest = %d\n", setup->bRequest);
|
|
printf("wValue = %d\n", le16_to_cpu(setup->wValue));
|
|
printf("wIndex = %d\n", le16_to_cpu(setup->wIndex));
|
|
printf("wLength = %d\n", le16_to_cpu(setup->wLength));
|
|
}
|
|
|
|
static ssize_t
|
|
ep0_consume(struct thread *ignore, const void *buf, size_t nbytes)
|
|
{
|
|
static const char *const names[] = {
|
|
[FUNCTIONFS_BIND] = "BIND",
|
|
[FUNCTIONFS_UNBIND] = "UNBIND",
|
|
[FUNCTIONFS_ENABLE] = "ENABLE",
|
|
[FUNCTIONFS_DISABLE] = "DISABLE",
|
|
[FUNCTIONFS_SETUP] = "SETUP",
|
|
[FUNCTIONFS_SUSPEND] = "SUSPEND",
|
|
[FUNCTIONFS_RESUME] = "RESUME",
|
|
};
|
|
|
|
const struct usb_functionfs_event *event = buf;
|
|
size_t n;
|
|
|
|
(void)ignore;
|
|
|
|
for (n = nbytes / sizeof *event; n; --n, ++event)
|
|
switch (event->type) {
|
|
case FUNCTIONFS_BIND:
|
|
case FUNCTIONFS_UNBIND:
|
|
case FUNCTIONFS_ENABLE:
|
|
case FUNCTIONFS_DISABLE:
|
|
case FUNCTIONFS_SETUP:
|
|
case FUNCTIONFS_SUSPEND:
|
|
case FUNCTIONFS_RESUME:
|
|
printf("Event %s\n", names[event->type]);
|
|
if (event->type == FUNCTIONFS_SETUP)
|
|
handle_setup(&event->u.setup);
|
|
break;
|
|
|
|
default:
|
|
printf("Event %03u (unknown)\n", event->type);
|
|
}
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
static void ep0_init(struct thread *t, bool legacy_descriptors)
|
|
{
|
|
void *legacy;
|
|
ssize_t ret;
|
|
size_t len;
|
|
|
|
if (legacy_descriptors) {
|
|
info("%s: writing descriptors\n", t->filename);
|
|
goto legacy;
|
|
}
|
|
|
|
info("%s: writing descriptors (in v2 format)\n", t->filename);
|
|
ret = write(t->fd, &descriptors, sizeof descriptors);
|
|
|
|
if (ret < 0 && errno == EINVAL) {
|
|
warn("%s: new format rejected, trying legacy\n", t->filename);
|
|
legacy:
|
|
len = descs_to_legacy(&legacy, &descriptors);
|
|
if (len) {
|
|
ret = write(t->fd, legacy, len);
|
|
free(legacy);
|
|
}
|
|
}
|
|
die_on(ret < 0, "%s: write: descriptors", t->filename);
|
|
|
|
info("%s: writing strings\n", t->filename);
|
|
ret = write(t->fd, &strings, sizeof strings);
|
|
die_on(ret < 0, "%s: write: strings", t->filename);
|
|
}
|
|
|
|
|
|
/******************** Main **************************************************/
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
bool legacy_descriptors;
|
|
unsigned i;
|
|
|
|
legacy_descriptors = argc > 2 && !strcmp(argv[1], "-l");
|
|
|
|
init_thread(threads);
|
|
ep0_init(threads, legacy_descriptors);
|
|
|
|
for (i = 1; i < sizeof threads / sizeof *threads; ++i)
|
|
init_thread(threads + i);
|
|
|
|
for (i = 1; i < sizeof threads / sizeof *threads; ++i)
|
|
start_thread(threads + i);
|
|
|
|
start_thread_helper(threads);
|
|
|
|
for (i = 1; i < sizeof threads / sizeof *threads; ++i)
|
|
join_thread(threads + i);
|
|
|
|
return 0;
|
|
}
|