linux/tools/usb/ffs-test.c
Michal Nazarewicz b9a4274699 tools: ffs-test: add compatibility code for old kernels
If ffs-test is used with a kernel prior to 3.14, which do not
support the new descriptors format, it will fail when trying to
write the descriptors.  Add a function that converts the new
descriptors to the legacy ones and use it to retry writing the
descriptors using the legacy format.

Also add “-l” flag to ffs-test which will cause the tool to
never try the new format and instead immediatelly try the
legacy one.  This should be useful to test whether parsing
of the old format still works on given 3.14+ kernel.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-09-02 09:16:46 -05:00

634 lines
15 KiB
C

/*
* ffs-test.c -- user mode filesystem api for usb composite function
*
* Copyright (C) 2010 Samsung Electronics
* Author: Michal Nazarewicz <mina86@mina86.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* $(CROSS_COMPILE)cc -Wall -Wextra -g -o ffs-test ffs-test.c -lpthread */
#define _BSD_SOURCE /* for endian.h */
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <tools/le_byteshift.h>
#include "../../include/uapi/linux/usb/functionfs.h"
/******************** Little Endian Handling ********************************/
#define cpu_to_le16(x) htole16(x)
#define cpu_to_le32(x) htole32(x)
#define le32_to_cpu(x) le32toh(x)
#define le16_to_cpu(x) le16toh(x)
/******************** Messages and Errors ***********************************/
static const char argv0[] = "ffs-test";
static unsigned verbosity = 7;
static void _msg(unsigned level, const char *fmt, ...)
{
if (level < 2)
level = 2;
else if (level > 7)
level = 7;
if (level <= verbosity) {
static const char levels[8][6] = {
[2] = "crit:",
[3] = "err: ",
[4] = "warn:",
[5] = "note:",
[6] = "info:",
[7] = "dbg: "
};
int _errno = errno;
va_list ap;
fprintf(stderr, "%s: %s ", argv0, levels[level]);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
if (fmt[strlen(fmt) - 1] != '\n') {
char buffer[128];
strerror_r(_errno, buffer, sizeof buffer);
fprintf(stderr, ": (-%d) %s\n", _errno, buffer);
}
fflush(stderr);
}
}
#define die(...) (_msg(2, __VA_ARGS__), exit(1))
#define err(...) _msg(3, __VA_ARGS__)
#define warn(...) _msg(4, __VA_ARGS__)
#define note(...) _msg(5, __VA_ARGS__)
#define info(...) _msg(6, __VA_ARGS__)
#define debug(...) _msg(7, __VA_ARGS__)
#define die_on(cond, ...) do { \
if (cond) \
die(__VA_ARGS__); \
} while (0)
/******************** Descriptors and Strings *******************************/
static const struct {
struct usb_functionfs_descs_head_v2 header;
__le32 fs_count;
__le32 hs_count;
struct {
struct usb_interface_descriptor intf;
struct usb_endpoint_descriptor_no_audio sink;
struct usb_endpoint_descriptor_no_audio source;
} __attribute__((packed)) fs_descs, hs_descs;
} __attribute__((packed)) descriptors = {
.header = {
.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
.flags = cpu_to_le32(FUNCTIONFS_HAS_FS_DESC |
FUNCTIONFS_HAS_HS_DESC),
.length = cpu_to_le32(sizeof descriptors),
},
.fs_count = cpu_to_le32(3),
.fs_descs = {
.intf = {
.bLength = sizeof descriptors.fs_descs.intf,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.iInterface = 1,
},
.sink = {
.bLength = sizeof descriptors.fs_descs.sink,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 1 | USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
/* .wMaxPacketSize = autoconfiguration (kernel) */
},
.source = {
.bLength = sizeof descriptors.fs_descs.source,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 2 | USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
/* .wMaxPacketSize = autoconfiguration (kernel) */
},
},
.hs_count = cpu_to_le32(3),
.hs_descs = {
.intf = {
.bLength = sizeof descriptors.fs_descs.intf,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.iInterface = 1,
},
.sink = {
.bLength = sizeof descriptors.hs_descs.sink,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 1 | USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
},
.source = {
.bLength = sizeof descriptors.hs_descs.source,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 2 | USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
.bInterval = 1, /* NAK every 1 uframe */
},
},
};
static size_t descs_to_legacy(void **legacy, const void *descriptors_v2)
{
const unsigned char *descs_end, *descs_start;
__u32 length, fs_count = 0, hs_count = 0, count;
/* Read v2 header */
{
const struct {
const struct usb_functionfs_descs_head_v2 header;
const __le32 counts[];
} __attribute__((packed)) *const in = descriptors_v2;
const __le32 *counts = in->counts;
__u32 flags;
if (le32_to_cpu(in->header.magic) !=
FUNCTIONFS_DESCRIPTORS_MAGIC_V2)
return 0;
length = le32_to_cpu(in->header.length);
if (length <= sizeof in->header)
return 0;
length -= sizeof in->header;
flags = le32_to_cpu(in->header.flags);
if (flags & ~(FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
FUNCTIONFS_HAS_SS_DESC))
return 0;
#define GET_NEXT_COUNT_IF_FLAG(ret, flg) do { \
if (!(flags & (flg))) \
break; \
if (length < 4) \
return 0; \
ret = le32_to_cpu(*counts); \
length -= 4; \
++counts; \
} while (0)
GET_NEXT_COUNT_IF_FLAG(fs_count, FUNCTIONFS_HAS_FS_DESC);
GET_NEXT_COUNT_IF_FLAG(hs_count, FUNCTIONFS_HAS_HS_DESC);
GET_NEXT_COUNT_IF_FLAG(count, FUNCTIONFS_HAS_SS_DESC);
count = fs_count + hs_count;
if (!count)
return 0;
descs_start = (const void *)counts;
#undef GET_NEXT_COUNT_IF_FLAG
}
/*
* Find the end of FS and HS USB descriptors. SS descriptors
* are ignored since legacy format does not support them.
*/
descs_end = descs_start;
do {
if (length < *descs_end)
return 0;
length -= *descs_end;
descs_end += *descs_end;
} while (--count);
/* Allocate legacy descriptors and copy the data. */
{
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
struct {
struct usb_functionfs_descs_head header;
__u8 descriptors[];
} __attribute__((packed)) *out;
#pragma GCC diagnostic pop
length = sizeof out->header + (descs_end - descs_start);
out = malloc(length);
out->header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC);
out->header.length = cpu_to_le32(length);
out->header.fs_count = cpu_to_le32(fs_count);
out->header.hs_count = cpu_to_le32(hs_count);
memcpy(out->descriptors, descs_start, descs_end - descs_start);
*legacy = out;
}
return length;
}
#define STR_INTERFACE_ "Source/Sink"
static const struct {
struct usb_functionfs_strings_head header;
struct {
__le16 code;
const char str1[sizeof STR_INTERFACE_];
} __attribute__((packed)) lang0;
} __attribute__((packed)) strings = {
.header = {
.magic = cpu_to_le32(FUNCTIONFS_STRINGS_MAGIC),
.length = cpu_to_le32(sizeof strings),
.str_count = cpu_to_le32(1),
.lang_count = cpu_to_le32(1),
},
.lang0 = {
cpu_to_le16(0x0409), /* en-us */
STR_INTERFACE_,
},
};
#define STR_INTERFACE strings.lang0.str1
/******************** Files and Threads Handling ****************************/
struct thread;
static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes);
static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes);
static ssize_t ep0_consume(struct thread *t, const void *buf, size_t nbytes);
static ssize_t fill_in_buf(struct thread *t, void *buf, size_t nbytes);
static ssize_t empty_out_buf(struct thread *t, const void *buf, size_t nbytes);
static struct thread {
const char *const filename;
size_t buf_size;
ssize_t (*in)(struct thread *, void *, size_t);
const char *const in_name;
ssize_t (*out)(struct thread *, const void *, size_t);
const char *const out_name;
int fd;
pthread_t id;
void *buf;
ssize_t status;
} threads[] = {
{
"ep0", 4 * sizeof(struct usb_functionfs_event),
read_wrap, NULL,
ep0_consume, "<consume>",
0, 0, NULL, 0
},
{
"ep1", 8 * 1024,
fill_in_buf, "<in>",
write_wrap, NULL,
0, 0, NULL, 0
},
{
"ep2", 8 * 1024,
read_wrap, NULL,
empty_out_buf, "<out>",
0, 0, NULL, 0
},
};
static void init_thread(struct thread *t)
{
t->buf = malloc(t->buf_size);
die_on(!t->buf, "malloc");
t->fd = open(t->filename, O_RDWR);
die_on(t->fd < 0, "%s", t->filename);
}
static void cleanup_thread(void *arg)
{
struct thread *t = arg;
int ret, fd;
fd = t->fd;
if (t->fd < 0)
return;
t->fd = -1;
/* test the FIFO ioctls (non-ep0 code paths) */
if (t != threads) {
ret = ioctl(fd, FUNCTIONFS_FIFO_STATUS);
if (ret < 0) {
/* ENODEV reported after disconnect */
if (errno != ENODEV)
err("%s: get fifo status", t->filename);
} else if (ret) {
warn("%s: unclaimed = %d\n", t->filename, ret);
if (ioctl(fd, FUNCTIONFS_FIFO_FLUSH) < 0)
err("%s: fifo flush", t->filename);
}
}
if (close(fd) < 0)
err("%s: close", t->filename);
free(t->buf);
t->buf = NULL;
}
static void *start_thread_helper(void *arg)
{
const char *name, *op, *in_name, *out_name;
struct thread *t = arg;
ssize_t ret;
info("%s: starts\n", t->filename);
in_name = t->in_name ? t->in_name : t->filename;
out_name = t->out_name ? t->out_name : t->filename;
pthread_cleanup_push(cleanup_thread, arg);
for (;;) {
pthread_testcancel();
ret = t->in(t, t->buf, t->buf_size);
if (ret > 0) {
ret = t->out(t, t->buf, ret);
name = out_name;
op = "write";
} else {
name = in_name;
op = "read";
}
if (ret > 0) {
/* nop */
} else if (!ret) {
debug("%s: %s: EOF", name, op);
break;
} else if (errno == EINTR || errno == EAGAIN) {
debug("%s: %s", name, op);
} else {
warn("%s: %s", name, op);
break;
}
}
pthread_cleanup_pop(1);
t->status = ret;
info("%s: ends\n", t->filename);
return NULL;
}
static void start_thread(struct thread *t)
{
debug("%s: starting\n", t->filename);
die_on(pthread_create(&t->id, NULL, start_thread_helper, t) < 0,
"pthread_create(%s)", t->filename);
}
static void join_thread(struct thread *t)
{
int ret = pthread_join(t->id, NULL);
if (ret < 0)
err("%s: joining thread", t->filename);
else
debug("%s: joined\n", t->filename);
}
static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes)
{
return read(t->fd, buf, nbytes);
}
static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes)
{
return write(t->fd, buf, nbytes);
}
/******************** Empty/Fill buffer routines ****************************/
/* 0 -- stream of zeros, 1 -- i % 63, 2 -- pipe */
enum pattern { PAT_ZERO, PAT_SEQ, PAT_PIPE };
static enum pattern pattern;
static ssize_t
fill_in_buf(struct thread *ignore, void *buf, size_t nbytes)
{
size_t i;
__u8 *p;
(void)ignore;
switch (pattern) {
case PAT_ZERO:
memset(buf, 0, nbytes);
break;
case PAT_SEQ:
for (p = buf, i = 0; i < nbytes; ++i, ++p)
*p = i % 63;
break;
case PAT_PIPE:
return fread(buf, 1, nbytes, stdin);
}
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;
}