libsigrok/hardware/zeroplus-logic-cube/gl_usb.c

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/*
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* This file is part of the sigrok project.
*
* Copyright (C) 2010 Sven Peter <sven@fail0verflow.com>
* Copyright (C) 2010 Haxx Enterprises <bushing@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
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#include <libusb.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "gl_usb.h"
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#include "protocol.h"
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#define CTRL_IN (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN | \
LIBUSB_RECIPIENT_INTERFACE)
#define CTRL_OUT (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT | \
LIBUSB_RECIPIENT_INTERFACE)
#define EP1_BULK_IN (LIBUSB_ENDPOINT_IN | 1)
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#define TIMEOUT 5000 /* Timeout in ms */
enum {
REQ_READBULK = 0x82,
REQ_WRITEADDR,
REQ_READDATA,
REQ_WRITEDATA,
};
static int gl_write_address(libusb_device_handle *devh, unsigned int address)
{
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unsigned char packet[8] = { address & 0xFF };
int ret;
ret = libusb_control_transfer(devh, CTRL_OUT, 0xc, REQ_WRITEADDR,
0, packet, 1, TIMEOUT);
if (ret != 1)
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sr_err("%s: %s.", __func__, libusb_error_name(ret));
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return ret;
}
static int gl_write_data(libusb_device_handle *devh, unsigned int val)
{
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unsigned char packet[8] = { val & 0xFF };
int ret;
ret = libusb_control_transfer(devh, CTRL_OUT, 0xc, REQ_WRITEDATA,
0, packet, 1, TIMEOUT);
if (ret != 1)
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sr_err("%s: %s.", __func__, libusb_error_name(ret));
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return ret;
}
static int gl_read_data(libusb_device_handle *devh)
{
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unsigned char packet[8] = { 0 };
int ret;
ret = libusb_control_transfer(devh, CTRL_IN, 0xc, REQ_READDATA,
0, packet, 1, TIMEOUT);
if (ret != 1)
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sr_err("%s: %s, val=%hhx.", __func__,
libusb_error_name(ret), packet[0]);
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return (ret == 1) ? packet[0] : ret;
}
SR_PRIV int gl_read_bulk(libusb_device_handle *devh, void *buffer,
unsigned int size)
{
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unsigned char packet[8] =
{ 0, 0, 0, 0, size & 0xff, (size & 0xff00) >> 8,
(size & 0xff0000) >> 16, (size & 0xff000000) >> 24 };
int ret, transferred = 0;
ret = libusb_control_transfer(devh, CTRL_OUT, 0x4, REQ_READBULK,
0, packet, 8, TIMEOUT);
if (ret != 8)
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sr_err("%s: libusb_control_transfer: %s.", __func__,
libusb_error_name(ret));
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ret = libusb_bulk_transfer(devh, EP1_BULK_IN, buffer, size,
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&transferred, TIMEOUT);
if (ret < 0)
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sr_err("%s: libusb_bulk_transfer: %s.", __func__,
libusb_error_name(ret));
return transferred;
}
SR_PRIV int gl_reg_write(libusb_device_handle *devh, unsigned int reg,
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unsigned int val)
{
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int ret;
ret = gl_write_address(devh, reg);
if (ret < 0)
return ret;
ret = gl_write_data(devh, val);
return ret;
}
SR_PRIV int gl_reg_read(libusb_device_handle *devh, unsigned int reg)
{
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int ret;
ret = gl_write_address(devh, reg);
if (ret < 0)
return ret;
ret = gl_read_data(devh);
return ret;
}