avrdude/usb_libusb.c

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/*
* avrdude - A Downloader/Uploader for AVR device programmers
* Copyright (C) 2005 Joerg Wunsch
*
* 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
*/
/* $Id$ */
/*
* USB interface via libusb for avrdude.
*/
#include "ac_cfg.h"
#if defined(HAVE_LIBUSB)
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <usb.h>
#include "serial.h"
extern char *progname;
extern int verbose;
#define USB_VENDOR_ATMEL 1003
#define USB_DEVICE_JTAGICEMKII 0x2103
/*
* Should we query the endpoint number and max transfer size from USB?
* After all, the JTAG ICE mkII docs document these values.
*/
#define JTAGICE_BULK_EP 2
#define JTAGICE_MAX_XFER 64
static char usbbuf[JTAGICE_MAX_XFER];
static int buflen = -1, bufptr;
static int usbdev_open(char * port, long baud)
{
char string[256];
struct usb_bus *bus;
struct usb_device *dev;
usb_dev_handle *udev;
char *serno, *cp2;
size_t x;
/*
* The syntax for usb devices is defined as:
*
* -P usb[:serialnumber]
*
* See if we've got a serial number passed here. The serial number
* might contain colons which we remove below, and we compare it
* right-to-left, so only the least significant nibbles need to be
* specified.
*/
if ((serno = strchr(port, ':')) != NULL)
{
/* first, drop all colons there if any */
cp2 = ++serno;
while ((cp2 = strchr(cp2, ':')) != NULL)
{
x = strlen(cp2) - 1;
memmove(cp2, cp2 + 1, x);
cp2[x] = '\0';
}
if (strlen(serno) > 12)
{
fprintf(stderr,
"%s: usbdev_open(): invalid serial number \"%s\"\n",
progname, serno);
exit(1);
}
}
usb_init();
usb_find_busses();
usb_find_devices();
for (bus = usb_busses; bus; bus = bus->next)
{
if (bus->root_dev)
continue;
for (dev = bus->devices; dev; dev = dev->next)
{
udev = usb_open(dev);
if (udev)
{
if (dev->descriptor.idVendor == USB_VENDOR_ATMEL &&
dev->descriptor.idProduct == USB_DEVICE_JTAGICEMKII)
{
/* yeah, we found something */
if (usb_get_string_simple(udev,
dev->descriptor.iSerialNumber,
string, sizeof(string)) < 0)
{
fprintf(stderr,
"%s: usb_open(): cannot read serial number \"%s\"\n",
progname, usb_strerror());
exit(1);
}
if (verbose)
fprintf(stderr,
"%s: usb_open(): Found JTAG ICE, serno: %s\n",
progname, string);
if (serno != NULL)
{
/*
* See if the serial number requested by the
* user matches what we found, matching
* right-to-left.
*/
x = strlen(string) - strlen(serno);
if (strcasecmp(string + x, serno) != 0)
{
if (verbose > 2)
fprintf(stderr,
"%s: usbdev_open(): serial number doesn't match\n",
progname);
usb_close(udev);
continue;
}
}
return (int)udev;
}
usb_close(udev);
}
}
}
fprintf(stderr, "%s: usbdev_open(): did not find any%s USB device \"%s\"\n",
progname, serno? " (matching)": "", port);
exit(1);
}
static int usbdev_setspeed(int fd, long baud)
{
return 0;
}
static void usbdev_close(int fd)
{
usb_dev_handle *udev = (usb_dev_handle *)fd;
usb_close(udev);
}
static int usbdev_send(int fd, char *bp, size_t mlen)
{
usb_dev_handle *udev = (usb_dev_handle *)fd;
return usb_bulk_write(udev, JTAGICE_BULK_EP, (char *)bp, mlen, 5000) != mlen;
}
/*
* As calls to usb_bulk_read() result in exactly one USB request, we
* have to buffer the read results ourselves, so the single-char read
* requests performed by the upper layers will be handled. In order
* to do this, we maintain a private buffer of what we've got so far,
* and transparently issue another USB read request if the buffer is
* empty and more data are requested.
*/
static int
usb_fill_buf(usb_dev_handle *udev)
{
int rv;
rv = usb_bulk_read(udev, JTAGICE_BULK_EP, usbbuf, JTAGICE_MAX_XFER, 5000);
if (rv < 0)
{
if (verbose > 1)
fprintf(stderr, "%s: usb_fill_buf(): usb_bulk_read() error %s\n",
progname, usb_strerror());
return -1;
}
buflen = rv;
bufptr = 0;
return 0;
}
static int usbdev_recv(int fd, char *buf, size_t nbytes)
{
usb_dev_handle *udev = (usb_dev_handle *)fd;
int i, amnt;
char * p = buf;
for (i = 0; nbytes > 0;)
{
if (buflen <= bufptr)
{
if (usb_fill_buf(udev) < 0)
return -1;
}
amnt = buflen - bufptr > nbytes? nbytes: buflen - bufptr;
memcpy(buf + i, usbbuf + bufptr, amnt);
bufptr += amnt;
nbytes -= amnt;
i += amnt;
}
if (verbose > 3)
{
fprintf(stderr, "%s: Recv: ", progname);
while (i) {
unsigned char c = *p;
if (isprint(c)) {
fprintf(stderr, "%c ", c);
}
else {
fprintf(stderr, ". ");
}
fprintf(stderr, "[%02x] ", c);
p++;
i--;
}
fprintf(stderr, "\n");
}
return 0;
}
static int usbdev_drain(int fd, int display)
{
return 0;
}
struct serial_device usb_serdev =
{
.open = usbdev_open,
.setspeed = usbdev_setspeed,
.close = usbdev_close,
.send = usbdev_send,
.recv = usbdev_recv,
.drain = usbdev_drain,
};
#endif /* HAVE_LIBUSB */