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/*
* halfkay.c -- HalfKay protocol implementation
* Based on Teensy Loader (cli) (http://www.pjrc.com/teensy/loader_cli.html)
*
* Copyright (C) 2016-2017 Tomasz Kramkowski <tk@the-tk.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 3 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, see <http://www.gnu.org/licenses/>.
*/
#define _DEFAULT_SOURCE
#include <assert.h>
#include <errno.h>
#include <libusb-1.0/libusb.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "halfkay.h"
#include "eprintf.h"
enum {
HK_USB_VID = 0x16c0,
HK_USB_PID = 0x0478,
HK_USB_REQTYP = (LIBUSB_ENDPOINT_OUT \
| LIBUSB_REQUEST_TYPE_CLASS \
| LIBUSB_RECIPIENT_INTERFACE),
HK_USB_REQ = LIBUSB_REQUEST_SET_CONFIGURATION,
HK_USB_VAL = 0x200,
TIMEOUT = 2000,
TIMEOUT_FIRST = 3000,
SEND_DELAY = 4000,
SEND_ATTEMPTS = 10,
REBOOTCMD_WIDTH = 3,
REBOOTCMD_FILL = 0xff,
};
libusb_device_handle *hk_usb_hnd;
static inline void libusb_err(const char *action, int code)
{
eprintf("libusb %s failed: %s", action, libusb_strerror(code));
}
static void usbopen(void)
{
int rc;
if (hk_usb_hnd != NULL)
return;
rc = libusb_init(NULL);
if (libusb_init(NULL) != LIBUSB_SUCCESS)
libusb_err("init", rc);
hk_usb_hnd = libusb_open_device_with_vid_pid(NULL, HK_USB_VID, HK_USB_PID);
if (!hk_usb_hnd)
eprintf("HalfKay device not found");
libusb_set_auto_detach_kernel_driver(hk_usb_hnd, 1);
rc = libusb_claim_interface(hk_usb_hnd, 0);
if (rc < 0)
libusb_err("claim", rc);
}
static void usbclose(void)
{
if (hk_usb_hnd == NULL)
return;
libusb_release_interface(hk_usb_hnd, 0);
libusb_close(hk_usb_hnd);
libusb_exit(NULL);
hk_usb_hnd = NULL;
}
/* TODO: move somewhere or consider a cleaner replacement */
/* udelay: usleep replacement */
static void udelay(unsigned long usec)
{
enum { USECSEC = 1000000, NSECUSEC = 1000, };
struct timespec ts = {
.tv_sec = usec / USECSEC,
.tv_nsec = usec % USECSEC * NSECUSEC,
};
/* If we get interrupted, oh well */
nanosleep(&ts, NULL);
}
static void usbsendcmd(void *data, size_t size, bool firstxfer)
{
unsigned int timeout = firstxfer ? TIMEOUT_FIRST : TIMEOUT;
int rc, attempt = 0;
unsigned long delay = SEND_DELAY;
_Static_assert(SEND_DELAY << SEND_ATTEMPTS <= (1UL << 32) - 1,
"SEND_DELAY << SEND_ATTEMPTS > 2^32 - 1");
do {
rc = libusb_control_transfer(hk_usb_hnd, HK_USB_REQTYP, HK_USB_REQ,
HK_USB_VAL, 0, data, size, timeout);
udelay(delay);
delay *= 2;
} while (rc == LIBUSB_ERROR_PIPE && ++attempt < SEND_ATTEMPTS);
if (rc < 0)
libusb_err("transfer", rc);
}
static void fmtcmd(void *_dest, const struct flashparams *fp, size_t addr)
{
static const size_t MAX_SHIFT = sizeof addr * CHAR_BIT / 8;
unsigned char *dest = _dest;
assert(dest);
assert(fp);
addr >>= fp->addrshft;
for (size_t i = 0; i < fp->cmdsz && i < MAX_SHIFT; i++)
dest[i] = (addr >> (i * 8)) & 0xFF;
}
int flash(const struct flashparams *fp, const char *file)
{
FILE *f;
unsigned char *cmd;
size_t tsize;
assert(fp);
assert(fp->blksz && (fp->blksz & (fp->blksz - 1)) == 0);
assert(fp->memsz % fp->blksz == 0);
assert(SIZE_MAX - fp->blksz >= fp->cmdsz);
assert(file);
f = fopen(file, "rb");
if (!f)
eprintf("Could not open '%s':", file);
tsize = fp->blksz + fp->cmdsz;
cmd = emalloc(tsize);
usbopen();
for (size_t blkaddr = 0; blkaddr < fp->memsz; blkaddr += fp->blksz) {
size_t count;
fmtcmd(cmd, fp, blkaddr);
count = fread(cmd + fp->cmdsz, 1, fp->blksz, f);
if (count != fp->blksz && ferror(f))
eprintf("Error while reading '%s', short read", file);
if (count == 0)
break;
if (count < fp->blksz)
memset(cmd + fp->cmdsz + count, 0, fp->blksz - count);
usbsendcmd(cmd, tsize, blkaddr == 0);
}
if (!feof(f))
weprintf("Device ran out of space during writing!");
usbclose();
free(cmd);
fclose(f);
return 0;
}
int reboot(const struct flashparams *fp)
{
size_t tsize;
unsigned char *cmd;
assert(fp);
assert(fp->blksz && (fp->blksz & (fp->blksz - 1)) == 0);
assert(fp->memsz % fp->blksz == 0);
assert(SIZE_MAX - fp->blksz >= fp->cmdsz);
tsize = fp->blksz + fp->cmdsz;
cmd = ecalloc(tsize, 1);
memset(cmd, REBOOTCMD_FILL, REBOOTCMD_WIDTH);
usbopen();
usbsendcmd(cmd, tsize, true);
usbclose();
free(cmd);
return 0;
}
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