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/**
* Copyright (C) 2019 Johan van der Vyver
*
* 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/>.
*/
#include <string.h>
#include <stdlib.h>
#include "voltronic_dev_impl.h"
#include "voltronic_dev_usb.h"
#include "hidapi.h"
#define HID_REPORT_SIZE 8
#define VOLTRONIC_DEV_USB(_impl_ptr_) \
((hid_device*) (_impl_ptr_))
#define GET_REPORT_SIZE(_val_) \
(((_val_) > HID_REPORT_SIZE) ? HID_REPORT_SIZE : (_val_))
static inline void voltronic_usb_init_hidapi(void);
voltronic_dev_t voltronic_usb_create(
const unsigned int vendor_id,
const unsigned int product_id) {
voltronic_usb_init_hidapi();
SET_LAST_ERROR(0);
hid_device* dev = hid_open(
(unsigned short) vendor_id,
(unsigned short) product_id,
(const wchar_t*) 0);
if (dev != 0) {
SET_LAST_ERROR(0);
return voltronic_dev_internal_create((void*) dev);
}
return 0;
}
inline int voltronic_dev_impl_read(
void* impl_ptr,
char* buffer,
const size_t buffer_size,
const unsigned int timeout_milliseconds) {
SET_LAST_ERROR(0);
return hid_read_timeout(
VOLTRONIC_DEV_USB(impl_ptr),
(unsigned char*) buffer,
GET_REPORT_SIZE(buffer_size),
(int) timeout_milliseconds);
}
inline int voltronic_dev_impl_write(
void* impl_ptr,
const char* buffer,
const size_t buffer_size,
unsigned int timeout_milliseconds) {
++timeout_milliseconds; // stop unused warnings
const int write_size = GET_REPORT_SIZE(buffer_size);
unsigned char write_buffer[HID_REPORT_SIZE + 1] = { 0 };
COPY_MEMORY(&write_buffer[1], buffer, write_size);
SET_LAST_ERROR(0);
const int bytes_written = hid_write(
VOLTRONIC_DEV_USB(impl_ptr),
(const unsigned char*) write_buffer,
(size_t) (HID_REPORT_SIZE + 1));
return GET_REPORT_SIZE(bytes_written);
}
inline int voltronic_dev_impl_close(void* impl_ptr) {
hid_close(VOLTRONIC_DEV_USB(impl_ptr));
return 1;
}
static inline void voltronic_usb_exit_hidapi(void) {
hid_exit();
}
static inline void voltronic_usb_init_hidapi(void) {
static int hidapi_init_complete = 0;
if (hidapi_init_complete == 0) {
if (hid_init() == 0) {
atexit(voltronic_usb_exit_hidapi);
hidapi_init_complete = 1;
}
}
}
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