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Subject[PATCHv2 8/8] USB: testusb: testusb compatibility with FunctionFS gadget
The FunctionFS gadget may provide the source/sink interface
not as the first interface (with id == 0) but some different
interface hence a code to find the interface number is
required.

(Note that you will still configure the gadget to report
idProduct == 0xa4a4 (an "echo 0xa4a4
>/sys/module/g_ffs/parameters/usb_product" should suffice) or
configure host to handle 0x0525:0xa4ac devices using the
usbtest driver.)

Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
---
tools/usb/testusb.c | 252 ++++++++++++++++++++++++++++++++++++--------------
1 files changed, 181 insertions(+), 71 deletions(-)
diff --git a/tools/usb/testusb.c b/tools/usb/testusb.c
index 28e25ca..0a1a5b5 100644
--- a/tools/usb/testusb.c
+++ b/tools/usb/testusb.c
@@ -1,8 +1,10 @@
-/* $(CROSS_COMPILE)cc -Wall -g -lpthread -o testusb testusb.c */
+/* $(CROSS_COMPILE)cc -Wall -Wextra -g -lpthread -o testusb testusb.c */

/*
* Copyright (c) 2002 by David Brownell
- *
+ * Copyright (c) 2010 by Samsung Electronics
+ * Author: Michal Nazarewicz <m.nazarewicz@samsung.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
@@ -25,6 +27,7 @@
#include <pthread.h>
#include <unistd.h>
#include <errno.h>
+#include <limits.h>

#include <sys/types.h>
#include <sys/stat.h>
@@ -56,6 +59,13 @@ struct usbtest_param {

/* #include <linux/usb_ch9.h> */

+#define USB_DT_DEVICE 0x01
+#define USB_DT_INTERFACE 0x04
+
+#define USB_CLASS_PER_INTERFACE 0 /* for DeviceClass */
+#define USB_CLASS_VENDOR_SPEC 0xff
+
+
struct usb_device_descriptor {
__u8 bLength;
__u8 bDescriptorType;
@@ -73,6 +83,19 @@ struct usb_device_descriptor {
__u8 bNumConfigurations;
} __attribute__ ((packed));

+struct usb_interface_descriptor {
+ __u8 bLength;
+ __u8 bDescriptorType;
+
+ __u8 bInterfaceNumber;
+ __u8 bAlternateSetting;
+ __u8 bNumEndpoints;
+ __u8 bInterfaceClass;
+ __u8 bInterfaceSubClass;
+ __u8 bInterfaceProtocol;
+ __u8 iInterface;
+} __attribute__ ((packed));
+
enum usb_device_speed {
USB_SPEED_UNKNOWN = 0, /* enumerating */
USB_SPEED_LOW, USB_SPEED_FULL, /* usb 1.1 */
@@ -105,11 +128,42 @@ struct testdev {
};
static struct testdev *testdevs;

-static int is_testdev (struct usb_device_descriptor *dev)
+static int testdev_ffs_ifnum(FILE *fd)
{
+ union {
+ char buf[255];
+ struct usb_interface_descriptor intf;
+ } u;
+
+ for (;;) {
+ if (fread(u.buf, 1, 1, fd) != 1)
+ return -1;
+ if (fread(u.buf + 1, (unsigned char)u.buf[0] - 1, 1, fd) != 1)
+ return -1;
+
+ if (u.intf.bLength == sizeof u.intf
+ && u.intf.bDescriptorType == USB_DT_INTERFACE
+ && u.intf.bNumEndpoints == 2
+ && u.intf.bInterfaceClass == USB_CLASS_VENDOR_SPEC
+ && u.intf.bInterfaceSubClass == 0
+ && u.intf.bInterfaceProtocol == 0)
+ return (unsigned char)u.intf.bInterfaceNumber;
+ }
+}
+
+static int testdev_ifnum(FILE *fd)
+{
+ struct usb_device_descriptor dev;
+
+ if (fread(&dev, sizeof dev, 1, fd) != 1)
+ return -1;
+
+ if (dev.bLength != sizeof dev || dev.bDescriptorType != USB_DT_DEVICE)
+ return -1;
+
/* FX2 with (tweaked) bulksrc firmware */
- if (dev->idVendor == 0x0547 && dev->idProduct == 0x1002)
- return 1;
+ if (dev.idVendor == 0x0547 && dev.idProduct == 0x1002)
+ return 0;

/*----------------------------------------------------*/

@@ -124,95 +178,108 @@ static int is_testdev (struct usb_device_descriptor *dev)
*/

/* generic EZ-USB FX controller */
- if (dev->idVendor == 0x0547 && dev->idProduct == 0x2235)
- return 1;
+ if (dev.idVendor == 0x0547 && dev.idProduct == 0x2235)
+ return 0;

/* generic EZ-USB FX2 controller */
- if (dev->idVendor == 0x04b4 && dev->idProduct == 0x8613)
- return 1;
+ if (dev.idVendor == 0x04b4 && dev.idProduct == 0x8613)
+ return 0;

/* CY3671 development board with EZ-USB FX */
- if (dev->idVendor == 0x0547 && dev->idProduct == 0x0080)
- return 1;
+ if (dev.idVendor == 0x0547 && dev.idProduct == 0x0080)
+ return 0;

/* Keyspan 19Qi uses an21xx (original EZ-USB) */
- if (dev->idVendor == 0x06cd && dev->idProduct == 0x010b)
- return 1;
+ if (dev.idVendor == 0x06cd && dev.idProduct == 0x010b)
+ return 0;

/*----------------------------------------------------*/

/* "gadget zero", Linux-USB test software */
- if (dev->idVendor == 0x0525 && dev->idProduct == 0xa4a0)
- return 1;
+ if (dev.idVendor == 0x0525 && dev.idProduct == 0xa4a0)
+ return 0;

/* user mode subset of that */
- if (dev->idVendor == 0x0525 && dev->idProduct == 0xa4a4)
- return 1;
+ if (dev.idVendor == 0x0525 && dev.idProduct == 0xa4a4)
+ return testdev_ffs_ifnum(fd);
+ /* return 0; */

/* iso version of usermode code */
- if (dev->idVendor == 0x0525 && dev->idProduct == 0xa4a3)
- return 1;
+ if (dev.idVendor == 0x0525 && dev.idProduct == 0xa4a3)
+ return 0;

/* some GPL'd test firmware uses these IDs */

- if (dev->idVendor == 0xfff0 && dev->idProduct == 0xfff0)
- return 1;
+ if (dev.idVendor == 0xfff0 && dev.idProduct == 0xfff0)
+ return 0;

/*----------------------------------------------------*/

/* iBOT2 high speed webcam */
- if (dev->idVendor == 0x0b62 && dev->idProduct == 0x0059)
- return 1;
+ if (dev.idVendor == 0x0b62 && dev.idProduct == 0x0059)
+ return 0;

- return 0;
+ /*----------------------------------------------------*/
+
+ /* the FunctionFS gadget can have the source/sink interface
+ * anywhere. We look for an interface descriptor that match
+ * what we expect. We ignore configuratiens thou. */
+
+ if (dev.idVendor == 0x0525 && dev.idProduct == 0xa4ac
+ && (dev.bDeviceClass == USB_CLASS_PER_INTERFACE
+ || dev.bDeviceClass == USB_CLASS_VENDOR_SPEC))
+ return testdev_ffs_ifnum(fd);
+
+ return -1;
}

-static int find_testdev (const char *name, const struct stat *sb, int flag)
+static int find_testdev(const char *name, const struct stat *sb, int flag)
{
- int fd;
- struct usb_device_descriptor dev;
+ FILE *fd;
+ int ifnum;
+ struct testdev *entry;
+
+ (void)sb; /* unused */

if (flag != FTW_F)
return 0;
/* ignore /proc/bus/usb/{devices,drivers} */
- if (strrchr (name, '/')[1] == 'd')
+ if (strrchr(name, '/')[1] == 'd')
return 0;

- if ((fd = open (name, O_RDONLY)) < 0) {
- perror ("can't open dev file r/o");
+ fd = fopen(name, "rb");
+ if (!fd) {
+ perror(name);
return 0;
}
- if (read (fd, &dev, sizeof dev) != sizeof dev)
- fputs ("short devfile read!\n", stderr);
- else if (is_testdev (&dev)) {
- struct testdev *entry;
-
- if ((entry = calloc (1, sizeof *entry)) == 0) {
- fputs ("no mem!\n", stderr);
- goto done;
- }
- entry->name = strdup (name);
- if (!entry->name) {
- free (entry);
- goto done;
- }
-
- // FIXME better to look at each interface and ask if it's
- // bound to 'usbtest', rather than assume interface 0
- entry->ifnum = 0;

- // FIXME ask usbfs what speed; update USBDEVFS_CONNECTINFO
- // so it tells about high speed etc
+ ifnum = testdev_ifnum(fd);
+ fclose(fd);
+ if (ifnum < 0)
+ return 0;

- fprintf (stderr, "%s speed\t%s\n",
- speed (entry->speed), entry->name);
+ entry = calloc(1, sizeof *entry);
+ if (!entry)
+ goto nomem;

- entry->next = testdevs;
- testdevs = entry;
+ entry->name = strdup(name);
+ if (!entry->name) {
+ free(entry);
+nomem:
+ perror("malloc");
+ return 0;
}

-done:
- close (fd);
+ entry->ifnum = ifnum;
+
+ /* FIXME ask usbfs what speed; update USBDEVFS_CONNECTINFO so
+ * it tells about high speed etc */
+
+ fprintf(stderr, "%s speed\t%s\t%u\n",
+ speed(entry->speed), entry->name, entry->ifnum);
+
+ entry->next = testdevs;
+ testdevs = entry;
return 0;
}

@@ -277,11 +344,51 @@ restart:
return arg;
}

+static const char *usbfs_dir_find(void)
+{
+ static char usbfs_path_0[] = "/dev/bus/usb/devices";
+ static char usbfs_path_1[] = "/proc/bus/usb/devices";
+
+ static char *const usbfs_paths[] = {
+ usbfs_path_0, usbfs_path_1
+ };
+
+ static char *const *
+ end = usbfs_paths + sizeof usbfs_paths / sizeof *usbfs_paths;
+
+ char *const *it = usbfs_paths;
+ do {
+ int fd = open(*it, O_RDONLY);
+ close(fd);
+ if (fd >= 0) {
+ strrchr(*it, '/')[0] = '\0';
+ return *it;
+ }
+ } while (++it != end);
+
+ return NULL;
+}
+
+static int parse_num(unsigned *num, const char *str)
+{
+ unsigned long val;
+ char *end;
+
+ errno = 0;
+ val = strtoul(str, &end, 0);
+ if (errno || *end || val > UINT_MAX)
+ return -1;
+ *num = val;
+ return 0;
+}
+
int main (int argc, char **argv)
{
+
int c;
struct testdev *entry;
char *device;
+ const char *usbfs_dir = NULL;
int all = 0, forever = 0, not = 0;
int test = -1 /* all */;
struct usbtest_param param;
@@ -303,23 +410,24 @@ int main (int argc, char **argv)
/* for easy use when hotplugging */
device = getenv ("DEVICE");

- while ((c = getopt (argc, argv, "D:ac:g:hns:t:v:")) != EOF)
+ while ((c = getopt (argc, argv, "D:aA:c:g:hns:t:v:")) != EOF)
switch (c) {
case 'D': /* device, if only one */
device = optarg;
continue;
+ case 'A': /* use all devices with specified usbfs dir */
+ usbfs_dir = optarg;
+ /* FALL THROUGH */
case 'a': /* use all devices */
- device = 0;
+ device = NULL;
all = 1;
continue;
case 'c': /* count iterations */
- param.iterations = atoi (optarg);
- if (param.iterations < 0)
+ if (parse_num(&param.iterations, optarg))
goto usage;
continue;
case 'g': /* scatter/gather entries */
- param.sglen = atoi (optarg);
- if (param.sglen < 0)
+ if (parse_num(&param.sglen, optarg))
goto usage;
continue;
case 'l': /* loop forever */
@@ -329,8 +437,7 @@ int main (int argc, char **argv)
not = 1;
continue;
case 's': /* size of packet */
- param.length = atoi (optarg);
- if (param.length < 0)
+ if (parse_num(&param.length, optarg))
goto usage;
continue;
case 't': /* run just one test */
@@ -339,15 +446,14 @@ int main (int argc, char **argv)
goto usage;
continue;
case 'v': /* vary packet size by ... */
- param.vary = atoi (optarg);
- if (param.vary < 0)
+ if (parse_num(&param.vary, optarg))
goto usage;
continue;
case '?':
case 'h':
default:
usage:
- fprintf (stderr, "usage: %s [-an] [-D dev]\n"
+ fprintf (stderr, "usage: %s [-n] [-D dev | -a | -A usbfs-dir]\n"
"\t[-c iterations] [-t testnum]\n"
"\t[-s packetsize] [-g sglen] [-v vary]\n",
argv [0]);
@@ -361,13 +467,17 @@ usage:
goto usage;
}

- if ((c = open ("/proc/bus/usb/devices", O_RDONLY)) < 0) {
- fputs ("usbfs files are missing\n", stderr);
- return -1;
+ /* Find usbfs mount point */
+ if (!usbfs_dir) {
+ usbfs_dir = usbfs_dir_find();
+ if (!usbfs_dir) {
+ fputs ("usbfs files are missing\n", stderr);
+ return -1;
+ }
}

/* collect and list the test devices */
- if (ftw ("/proc/bus/usb", find_testdev, 3) != 0) {
+ if (ftw (usbfs_dir, find_testdev, 3) != 0) {
fputs ("ftw failed; is usbfs missing?\n", stderr);
return -1;
}
--
1.7.0


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