Browse Source

Merge pull request #343 from denis2342/ztex

support to upload the mining firmware to all ztex mining boards
nfactor-troky
Con Kolivas 12 years ago
parent
commit
5dc25882fb
  1. BIN
      bitstreams/ztex_ufm1_15d4.bin
  2. BIN
      bitstreams/ztex_ufm1_15y1.bin
  3. 8
      driver-ztex.c
  4. 515
      libztex.c

BIN
bitstreams/ztex_ufm1_15d4.bin

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BIN
bitstreams/ztex_ufm1_15y1.bin

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8
driver-ztex.c

@ -222,21 +222,19 @@ static int64_t ztex_scanhash(struct thr_info *thr, struct work *work, @@ -222,21 +222,19 @@ static int64_t ztex_scanhash(struct thr_info *thr, struct work *work,
applog(LOG_DEBUG, "%s: sent hashdata", ztex->repr);
lastnonce = malloc(sizeof(uint32_t)*ztex->numNonces);
lastnonce = calloc(1, sizeof(uint32_t)*ztex->numNonces);
if (lastnonce == NULL) {
applog(LOG_ERR, "%s: failed to allocate lastnonce[%d]", ztex->repr, ztex->numNonces);
return -1;
}
memset(lastnonce, 0, sizeof(uint32_t)*ztex->numNonces);
/* Add an extra slot for detecting dupes that lie around */
backlog_max = ztex->numNonces * (2 + ztex->extraSolutions);
backlog = malloc(sizeof(uint32_t) * backlog_max);
backlog = calloc(1, sizeof(uint32_t) * backlog_max);
if (backlog == NULL) {
applog(LOG_ERR, "%s: failed to allocate backlog[%d]", ztex->repr, backlog_max);
return -1;
}
memset(backlog, 0, sizeof(uint32_t) * backlog_max);
overflow = false;
@ -367,10 +365,10 @@ static bool ztex_prepare(struct thr_info *thr) @@ -367,10 +365,10 @@ static bool ztex_prepare(struct thr_info *thr)
ztex_releaseFpga(ztex);
return false;
}
ztex_releaseFpga(ztex);
ztex->freqM = ztex->freqMaxM+1;;
//ztex_updateFreq(ztex);
libztex_setFreq(ztex, ztex->freqMDefault);
ztex_releaseFpga(ztex);
applog(LOG_DEBUG, "%s: prepare", ztex->repr);
return true;
}

515
libztex.c

@ -1,7 +1,9 @@ @@ -1,7 +1,9 @@
/**
* libztex.c - Ztex 1.15x fpga board support library
* libztex.c - Ztex 1.15x/1.15y fpga board support library
*
* Copyright (c) 2012 nelisky.btc@gmail.com
* Copyright (c) 2012 Denis Ahrens <denis@h3q.com>
* Copyright (c) 2012 Peter Stuge <peter@stuge.se>
*
* This work is based upon the Java SDK provided by ztex which is
* Copyright (C) 2009-2011 ZTEX GmbH.
@ -46,22 +48,237 @@ @@ -46,22 +48,237 @@
//* Capability index for multi FPGA support.
#define CAPABILITY_MULTI_FPGA 0,7
static int libztex_get_string_descriptor_ascii(libusb_device_handle *dev, uint8_t desc_index,
unsigned char *data, int length) {
int i, cnt;
uint16_t langid;
unsigned char buf[260];
/* We open code string descriptor retrieval and ASCII decoding here
* in order to work around that libusb_get_string_descriptor_ascii()
* in the FreeBSD libusb implementation hits a bug in ZTEX firmware,
* where the device returns more bytes than requested, causing babble,
* which makes FreeBSD return an error to us.
*
* Avoid the mess by doing it manually the same way as libusb-1.0.
*/
cnt = libusb_control_transfer(dev, LIBUSB_ENDPOINT_IN,
LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_STRING << 8) | 0,
0x0000, buf, sizeof(buf), 1000);
if (cnt < 0) {
applog(LOG_ERR, "%s: Failed to read LANGIDs: %s", __func__, libusb_error_name(cnt));
return cnt;
}
langid = libusb_le16_to_cpu(((uint16_t *)buf)[1]);
static bool libztex_checkDevice(struct libusb_device *dev)
cnt = libusb_control_transfer(dev, LIBUSB_ENDPOINT_IN,
LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_STRING << 8) | desc_index,
langid, buf, sizeof(buf), 1000);
if (cnt < 0) {
applog(LOG_ERR, "%s: Failed to read string descriptor: %s", __func__, libusb_error_name(cnt));
return cnt;
}
/* num chars = (all bytes except bLength and bDescriptorType) / 2 */
for (i = 0; i <= (cnt - 2) / 2 && i < length-1; i++)
data[i] = buf[2 + i*2];
data[i] = 0;
return LIBUSB_SUCCESS;
}
enum check_result {
CHECK_ERROR,
CHECK_IS_NOT_ZTEX,
CHECK_OK,
CHECK_RESCAN,
};
static enum check_result libztex_checkDevice(struct libusb_device *dev)
{
FILE *fp = NULL;
libusb_device_handle *hndl = NULL;
struct libusb_device_descriptor desc;
int err;
int i, ret = CHECK_ERROR, err, cnt;
size_t got_bytes, length;
unsigned char buf[64], *fw_buf;
err = libusb_get_device_descriptor(dev, &desc);
if (unlikely(err != 0)) {
applog(LOG_ERR, "Ztex check device: Failed to open read descriptor with error %d", err);
return false;
return CHECK_ERROR;
}
if (!(desc.idVendor == LIBZTEX_IDVENDOR && desc.idProduct == LIBZTEX_IDPRODUCT)) {
if (desc.idVendor != LIBZTEX_IDVENDOR || desc.idProduct != LIBZTEX_IDPRODUCT) {
applog(LOG_DEBUG, "Not a ZTEX device %0.4x:%0.4x", desc.idVendor, desc.idProduct);
return false;
return CHECK_IS_NOT_ZTEX;
}
return true;
err = libusb_open(dev, &hndl);
if (err != LIBUSB_SUCCESS) {
applog(LOG_ERR, "%s: Can not open ZTEX device: %s", __func__, libusb_error_name(err));
goto done;
}
cnt = libusb_control_transfer(hndl, 0xc0, 0x22, 0, 0, buf, 40, 500);
if (unlikely(cnt < 0)) {
applog(LOG_ERR, "Ztex check device: Failed to read ztex descriptor with err %d", cnt);
goto done;
}
if (buf[0] != 40 || buf[1] != 1 || buf[2] != 'Z' || buf[3] != 'T' || buf[4] != 'E' || buf[5] != 'X') {
applog(LOG_ERR, "Ztex check device: Error reading ztex descriptor");
goto done;
}
if (buf[6] != 10)
{
ret = CHECK_IS_NOT_ZTEX;
goto done;
}
// 15 = 1.15y 13 = 1.15d or 1.15x
switch(buf[7])
{
case 13:
applog(LOG_ERR, "Found ztex board 1.15d or 1.15x");
break;
case 15:
applog(LOG_ERR, "Found ztex board 1.15y");
break;
default:
applog(LOG_ERR, "Found unknown ztex board");
ret = CHECK_IS_NOT_ZTEX;
goto done;
}
// testing for dummy firmware
if (buf[8] != 0) {
ret = CHECK_OK;
goto done;
}
applog(LOG_ERR, "Found dummy firmware, trying to send mining firmware");
char productString[32];
cnt = libztex_get_string_descriptor_ascii(hndl, desc.iProduct, productString, sizeof(productString));
if (unlikely(cnt < 0)) {
applog(LOG_ERR, "Ztex check device: Failed to read device productString with err %d", cnt);
return cnt;
}
applog(LOG_ERR, "productString: %s", productString);
unsigned char productID2 = buf[7];
char *firmware = NULL;
if (strcmp("USB-FPGA Module 1.15d (default)", productString) == 0 && productID2 == 13)
{
firmware = "ztex_ufm1_15d4.bin";
}
else if (strcmp("USB-FPGA Module 1.15x (default)", productString) == 0 && productID2 == 13)
{
firmware = "ztex_ufm1_15d4.bin";
}
else if (strcmp("USB-FPGA Module 1.15y (default)", productString) == 0 && productID2 == 15)
{
firmware = "ztex_ufm1_15y1.bin";
}
if (firmware == NULL)
{
applog(LOG_ERR, "could not figure out which firmware to use");
goto done;
}
applog(LOG_ERR, "Mining firmware filename: %s", firmware);
fp = open_bitstream("ztex", firmware);
if (!fp) {
applog(LOG_ERR, "failed to open firmware file '%s'", firmware);
goto done;
}
if (0 != fseek(fp, 0, SEEK_END)) {
applog(LOG_ERR, "Ztex firmware fseek: %s", strerror(errno));
goto done;
}
length = ftell(fp);
rewind(fp);
fw_buf = malloc(length);
if (!fw_buf) {
applog(LOG_ERR, "%s: Can not allocate memory: %s", __func__, strerror(errno));
goto done;
}
got_bytes = fread(fw_buf, 1, length, fp);
fclose(fp);
fp = NULL;
if (got_bytes < length) {
applog(LOG_ERR, "%s: Incomplete firmware read: %d/%d", __func__, got_bytes, length);
goto done;
}
// in buf[] is still the identifier of the dummy firmware
// use it to compare it with the new firmware
char *rv = memmem(fw_buf, got_bytes, buf, 8);
if (rv == NULL)
{
applog(LOG_ERR, "%s: found firmware is not ZTEX", __func__);
goto done;
}
// check for dummy firmware
if (rv[8] == 0)
{
applog(LOG_ERR, "%s: found a ZTEX dummy firmware", __func__);
goto done;
}
// reset 1
buf[0] = 1;
cnt = libusb_control_transfer(hndl, 0x40, 0xA0, 0xE600, 0, buf, 1,1000);
if (cnt < 0)
{
applog(LOG_ERR, "Ztex reset 1 failed: %s", libusb_error_name(cnt));
goto done;
}
for (i = 0; i < length; i+= 256) {
// firmware wants data in small chunks like 256 bytes
int numbytes = (length - i) < 256 ? (length - i) : 256;
int k = libusb_control_transfer(hndl, 0x40, 0xA0, i, 0, fw_buf + i, numbytes, 1000);
if (k < numbytes)
{
applog(LOG_ERR, "Ztex device: Failed to write firmware at %d with: %s", i, libusb_error_name(k));
goto done;
}
}
// reset 0
buf[0] = 0;
err = libusb_control_transfer(hndl, 0x40, 0xA0, 0xE600, 0, buf, 1,1000);
if (err < 0)
{
applog(LOG_ERR, "Ztex reset 0 failed: %s", libusb_error_name(err));
goto done;
}
applog(LOG_ERR, "Ztex device: succesfully wrote firmware");
ret = CHECK_RESCAN;
done:
if (fp)
fclose(fp);
if (hndl)
libusb_close(hndl);
return ret;
}
static bool libztex_checkCapability(struct libztex_device *ztex, int i, int j)
@ -132,8 +349,7 @@ static int libztex_configureFpgaHS(struct libztex_device *ztex, const char* firm @@ -132,8 +349,7 @@ static int libztex_configureFpgaHS(struct libztex_device *ztex, const char* firm
struct libztex_fpgastate state;
const int transactionBytes = 65536;
unsigned char buf[transactionBytes], settings[2];
int tries, cnt, buf_p, i;
ssize_t pos = 0;
int tries, cnt, err, i;
FILE *fp;
if (!libztex_checkCapability(ztex, CAPABILITY_HS_FPGA))
@ -141,7 +357,7 @@ static int libztex_configureFpgaHS(struct libztex_device *ztex, const char* firm @@ -141,7 +357,7 @@ static int libztex_configureFpgaHS(struct libztex_device *ztex, const char* firm
libztex_getFpgaState(ztex, &state);
if (!force && state.fpgaConfigured) {
applog(LOG_INFO, "Bitstream already configured");
return 1;
return 0;
}
cnt = libusb_control_transfer(ztex->hndl, 0xc0, 0x33, 0, 0, settings, 2, 1000);
if (unlikely(cnt < 0)) {
@ -154,56 +370,29 @@ static int libztex_configureFpgaHS(struct libztex_device *ztex, const char* firm @@ -154,56 +370,29 @@ static int libztex_configureFpgaHS(struct libztex_device *ztex, const char* firm
for (tries = 3; tries > 0; tries--) {
fp = open_bitstream("ztex", firmware);
if (!fp) {
applog(LOG_ERR, "%s: failed to read firmware '%s'", ztex->repr, firmware);
applog(LOG_ERR, "%s: failed to read bitstream '%s'", ztex->repr, firmware);
return -2;
}
while (pos < transactionBytes && !feof(fp)) {
buf[pos++] = getc(fp);
}
if (feof(fp))
pos--;
if (bs != 0 && bs != 1)
bs = libztex_detectBitstreamBitOrder(buf, transactionBytes < pos? transactionBytes: pos);
if (bs == 1)
libztex_swapBits(buf, pos);
libusb_control_transfer(ztex->hndl, 0x40, 0x34, 0, 0, NULL, 0, 1000);
// 0x34 - initHSFPGAConfiguration
buf_p = pos;
while (1) {
i = 0;
while (i < buf_p) {
if (libusb_bulk_transfer(ztex->hndl,
settings[0],
&buf[i],
buf_p - i,
&cnt, 1000) != 0) {
applog(LOG_ERR, "%s: Failed send hs fpga data", ztex->repr);
break;
}
usleep(500);
i += cnt;
}
if (i < buf_p || buf_p < transactionBytes)
break;
buf_p = 0;
while (buf_p < transactionBytes && !feof(fp)) {
buf[buf_p++] = getc(fp);
}
if (feof(fp))
buf_p--;
pos += buf_p;
if (buf_p == 0)
break;
do
{
int length = fread(buf,1,transactionBytes,fp);
if (bs != 0 && bs != 1)
bs = libztex_detectBitstreamBitOrder(buf, length);
if (bs == 1)
libztex_swapBits(buf, buf_p);
libztex_swapBits(buf, length);
err = libusb_bulk_transfer(ztex->hndl, settings[0], buf, length, &cnt, 1000);
if (cnt != length)
applog(LOG_ERR, "%s: cnt != length", ztex->repr);
if (err != 0)
applog(LOG_ERR, "%s: Failed send hs fpga data", ztex->repr);
}
while (!feof(fp));
libusb_control_transfer(ztex->hndl, 0x40, 0x35, 0, 0, NULL, 0, 1000);
// 0x35 - finishHSFPGAConfiguration
@ -232,9 +421,8 @@ static int libztex_configureFpgaLS(struct libztex_device *ztex, const char* firm @@ -232,9 +421,8 @@ static int libztex_configureFpgaLS(struct libztex_device *ztex, const char* firm
{
struct libztex_fpgastate state;
const int transactionBytes = 2048;
unsigned char buf[transactionBytes], cs;
int tries, cnt, buf_p, i;
ssize_t pos = 0;
unsigned char buf[transactionBytes];
int tries, cnt, i;
FILE *fp;
if (!libztex_checkCapability(ztex, CAPABILITY_FPGA))
@ -243,28 +431,16 @@ static int libztex_configureFpgaLS(struct libztex_device *ztex, const char* firm @@ -243,28 +431,16 @@ static int libztex_configureFpgaLS(struct libztex_device *ztex, const char* firm
libztex_getFpgaState(ztex, &state);
if (!force && state.fpgaConfigured) {
applog(LOG_DEBUG, "Bitstream already configured");
return 1;
return 0;
}
for (tries = 10; tries > 0; tries--) {
fp = open_bitstream("ztex", firmware);
if (!fp) {
applog(LOG_ERR, "%s: failed to read firmware '%s'", ztex->repr, firmware);
applog(LOG_ERR, "%s: failed to read bitstream '%s'", ztex->repr, firmware);
return -2;
}
cs = 0;
while (pos < transactionBytes && !feof(fp)) {
buf[pos] = getc(fp);
cs += buf[pos++];
}
if (feof(fp))
pos--;
if (bs != 0 && bs != 1)
bs = libztex_detectBitstreamBitOrder(buf, transactionBytes < pos? transactionBytes: pos);
//* Reset fpga
cnt = libztex_resetFpga(ztex);
if (unlikely(cnt < 0)) {
@ -272,36 +448,24 @@ static int libztex_configureFpgaLS(struct libztex_device *ztex, const char* firm @@ -272,36 +448,24 @@ static int libztex_configureFpgaLS(struct libztex_device *ztex, const char* firm
continue;
}
if (bs == 1)
libztex_swapBits(buf, pos);
buf_p = pos;
while (1) {
i = 0;
while (i < buf_p) {
cnt = libusb_control_transfer(ztex->hndl, 0x40, 0x32, 0, 0, &buf[i], buf_p - i, 5000);
if (unlikely(cnt < 0)) {
applog(LOG_ERR, "%s: Failed send fpga data with err %d", ztex->repr, cnt);
break;
}
i += cnt;
}
if (i < buf_p || buf_p < transactionBytes)
do
{
int length = fread(buf, 1, transactionBytes, fp);
if (bs != 0 && bs != 1)
bs = libztex_detectBitstreamBitOrder(buf, length);
if (bs == 1)
libztex_swapBits(buf, length);
cnt = libusb_control_transfer(ztex->hndl, 0x40, 0x32, 0, 0, buf, length, 5000);
if (cnt != length)
{
applog(LOG_ERR, "%s: Failed send hs fpga data", ztex->repr);
break;
buf_p = 0;
while (buf_p < transactionBytes && !feof(fp)) {
buf[buf_p] = getc(fp);
cs += buf[buf_p++];
}
if (feof(fp))
buf_p--;
pos += buf_p;
if (buf_p == 0)
break;
if (bs == 1)
libztex_swapBits(buf, buf_p);
}
if (cnt >= 0)
while (!feof(fp));
if (cnt > 0)
tries = 0;
fclose(fp);
@ -408,71 +572,28 @@ int libztex_suspend(struct libztex_device *ztex) { @@ -408,71 +572,28 @@ int libztex_suspend(struct libztex_device *ztex) {
}
int libztex_prepare_device(struct libusb_device *dev, struct libztex_device** ztex) {
struct libztex_device *newdev;
struct libztex_device *newdev = *ztex;
int i, cnt, err;
unsigned char buf[64];
uint16_t langid;
newdev = malloc(sizeof(struct libztex_device));
newdev->bitFileName = NULL;
newdev->numberOfFpgas = -1;
newdev->valid = false;
newdev->hndl = NULL;
*ztex = newdev;
err = libusb_open(dev, &newdev->hndl);
if (err != LIBUSB_SUCCESS) {
applog(LOG_ERR, "%s: Can not open ZTEX device: %s", __func__, libusb_error_name(err));
return CHECK_ERROR;
}
err = libusb_get_device_descriptor(dev, &newdev->descriptor);
if (unlikely(err != 0)) {
applog(LOG_ERR, "Ztex check device: Failed to open read descriptor with error %d", err);
return err;
}
// Check vendorId and productId
if (!(newdev->descriptor.idVendor == LIBZTEX_IDVENDOR &&
newdev->descriptor.idProduct == LIBZTEX_IDPRODUCT)) {
applog(LOG_ERR, "Not a ztex device? %0.4X, %0.4X", newdev->descriptor.idVendor, newdev->descriptor.idProduct);
return 1;
}
err = libusb_open(dev, &newdev->hndl);
if (unlikely(err != 0)) {
applog(LOG_ERR, "Ztex check device: Failed to open handle with error %d", err);
return err;
}
/* We open code string descriptor retrieval and ASCII decoding here
* in order to work around that libusb_get_string_descriptor_ascii()
* in the FreeBSD libusb implementation hits a bug in ZTEX firmware,
* where the device returns more bytes than requested, causing babble,
* which makes FreeBSD return an error to us.
*
* Avoid the mess by doing it manually the same way as libusb-1.0.
*/
cnt = libusb_control_transfer(newdev->hndl, LIBUSB_ENDPOINT_IN,
LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_STRING << 8) | 0,
0x0000, buf, sizeof(buf), 1000);
if (unlikely(cnt < 0)) {
applog(LOG_ERR, "Ztex check device: Failed to read device LANGIDs with err %d", cnt);
return cnt;
return CHECK_ERROR;
}
langid = libusb_le16_to_cpu(((uint16_t *)buf)[1]);
cnt = libusb_control_transfer(newdev->hndl, LIBUSB_ENDPOINT_IN,
LIBUSB_REQUEST_GET_DESCRIPTOR,
(LIBUSB_DT_STRING << 8) | newdev->descriptor.iSerialNumber,
langid, buf, sizeof(buf), 1000);
cnt = libztex_get_string_descriptor_ascii(newdev->hndl, newdev->descriptor.iSerialNumber, newdev->snString, sizeof(newdev->snString));
if (unlikely(cnt < 0)) {
applog(LOG_ERR, "Ztex check device: Failed to read device snString with err %d", cnt);
return cnt;
}
/* num chars = (all bytes except bLength and bDescriptorType) / 2 */
for (i = 0; i <= (cnt - 2) / 2 && i < (int)sizeof(newdev->snString)-1; i++)
newdev->snString[i] = buf[2 + i*2];
newdev->snString[i] = 0;
cnt = libusb_control_transfer(newdev->hndl, 0xc0, 0x22, 0, 0, buf, 40, 500);
if (unlikely(cnt < 0)) {
applog(LOG_ERR, "Ztex check device: Failed to read ztex descriptor with err %d", cnt);
@ -587,52 +708,104 @@ void libztex_destroy_device(struct libztex_device* ztex) @@ -587,52 +708,104 @@ void libztex_destroy_device(struct libztex_device* ztex)
int libztex_scanDevices(struct libztex_dev_list*** devs_p)
{
int usbdevices[LIBZTEX_MAX_DESCRIPTORS];
struct libztex_dev_list **devs;
struct libztex_device *ztex;
int found = 0, pos = 0, err;
libusb_device **list;
ssize_t cnt, i = 0;
cnt = libusb_get_device_list(NULL, &list);
if (unlikely(cnt < 0)) {
applog(LOG_ERR, "Ztex scan devices: Failed to list usb devices with err %d", cnt);
return 0;
}
struct libztex_dev_list **devs = NULL;
struct libusb_device_descriptor dev_descr;
struct libztex_device *ztex = NULL;
int found, max_found = 0, pos = 0, err, rescan, ret = 0;
libusb_device **list = NULL;
ssize_t cnt, i;
do {
cnt = libusb_get_device_list(NULL, &list);
if (unlikely(cnt < 0)) {
applog(LOG_ERR, "Ztex scan devices: Failed to list usb devices with err %d", cnt);
goto done;
}
for (i = 0; i < cnt; i++) {
if (libztex_checkDevice(list[i])) {
// Got one!
usbdevices[found] = i;
found++;
for (found = rescan = i = 0; i < cnt; i++) {
err = libztex_checkDevice(list[i]);
switch (err) {
case CHECK_ERROR:
applog(LOG_ERR, "Ztex: Can not check device: %s", libusb_error_name(err));
continue;
case CHECK_IS_NOT_ZTEX:
continue;
case CHECK_OK:
// Got one!
usbdevices[found++] = i;
break;
case CHECK_RESCAN:
rescan = 1;
found++;
break;
}
}
}
if (found < max_found)
rescan = 1;
else if (found > max_found)
max_found = found;
if (rescan)
libusb_free_device_list(list, 1);
} while (rescan);
if (0 == found)
goto done;
devs = malloc(sizeof(struct libztex_dev_list *) * found);
if (devs == NULL) {
applog(LOG_ERR, "Ztex scan devices: Failed to allocate memory");
return 0;
goto done;
}
for (i = 0; i < found; i++) {
if (!ztex) {
ztex = malloc(sizeof(*ztex));
if (!ztex) {
applog(LOG_ERR, "%s: Can not allocate memory for device struct: %s", __func__, strerror(errno));
goto done;
}
}
ztex->bitFileName = NULL;
ztex->numberOfFpgas = -1;
ztex->valid = false;
err = libztex_prepare_device(list[usbdevices[i]], &ztex);
if (unlikely(err != 0))
if (unlikely(err != 0)) {
applog(LOG_ERR, "prepare device: %d", err);
// check if valid
if (!ztex->valid) {
libztex_destroy_device(ztex);
ztex = NULL;
continue;
}
devs[pos] = malloc(sizeof(struct libztex_dev_list));
if (NULL == devs[pos]) {
applog(LOG_ERR, "%s: Can not allocate memory for device: %s", __func__, strerror(errno));
libztex_destroy_device(ztex);
ztex = NULL;
continue;
}
devs[pos]->dev = ztex;
ztex = NULL;
devs[pos]->next = NULL;
if (pos > 0)
devs[pos - 1]->next = devs[pos];
pos++;
}
libusb_free_device_list(list, 1);
*devs_p = devs;
return pos;
ret = pos;
done:
if (ret > 0)
*devs_p = devs;
else if (devs)
free(devs);
if (list)
libusb_free_device_list(list, 1);
return ret;
}
int libztex_sendHashData(struct libztex_device *ztex, unsigned char *sendbuf)

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