114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/**
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* Copyright (C) 2023 Carl Klemm
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 3 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#define _POSIX_C_SOURCE 199309L
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#include "eismultiplexer.h"
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#include "usbshm.h"
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#include <stdlib.h>
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#include <time.h>
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static void usleep(uint64_t microseconds)
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{
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struct timespec ts;
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ts.tv_sec = microseconds / 1000000;
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ts.tv_nsec = (microseconds % 1000000) * 1000;
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nanosleep(&ts, NULL);
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}
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static void dataCallback(uint8_t request, unsigned char* data, size_t length, void* user_data)
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{
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struct eismultiplexer* muliplexer = user_data;
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if(length >= 1)
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muliplexer->activeChannels = data[0];
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sem_post(&muliplexer->readSem);
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}
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int eismultiplexer_connect(struct eismultiplexer* muliplexer, int serial)
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{
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int ret;
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muliplexer->priv = malloc(sizeof(*muliplexer->priv));
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if(!muliplexer->priv)
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return -1;
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ret = usbshm_init(muliplexer->priv, &dataCallback, muliplexer);
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if(ret)
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return -2;
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ret = usbshm_open(muliplexer->priv, 0xfe17, 0x07dc , NULL);
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if(ret)
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return -3;
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ret = sem_init(&muliplexer->readSem, 0, 0);
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if(ret)
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return -4;
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return 0;
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}
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int eismultiplexer_connect_channel_exclusive(struct eismultiplexer* muliplexer, channel_t channel)
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{
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uint16_t wValue;
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// we compile with fno-strict-aliasing
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uint8_t* wValChar = (uint8_t*)&wValue;
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wValChar[0] = channel;
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wValChar[1] = 0;
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int ret;
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while((ret = usbshm_writeControlTransfer(muliplexer->priv, 2, NULL, 0, wValue, 0)) == USBSHM_ERROR_AGAIN)
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usleep(1000000);
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return ret;
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}
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int eismultiplexer_connect_channel(struct eismultiplexer* muliplexer, channel_t channel)
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{
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channel_t channels = eismultiplexer_get_connected(muliplexer);
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channels |= channel;
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return eismultiplexer_connect_channel_exclusive(muliplexer, channels);
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}
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int eismultiplexer_disconnect_channel(struct eismultiplexer* muliplexer, channel_t channel)
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{
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channel_t channels = eismultiplexer_get_connected(muliplexer);
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channels &= ~channel;
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return eismultiplexer_connect_channel_exclusive(muliplexer, channels);
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}
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channel_t eismultiplexer_get_connected(struct eismultiplexer* muliplexer)
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{
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usbshm_readControlTransfer(muliplexer->priv, 3, 1);
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sem_wait(&muliplexer->readSem);
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return muliplexer->activeChannels;
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}
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int eismultiplexer_set_led(struct eismultiplexer* muliplexer, bool on)
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{
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int ret;
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while((ret = usbshm_writeControlTransfer(muliplexer->priv, on, NULL, 0, 0, 0)) == USBSHM_ERROR_AGAIN)
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usleep(1000000);
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return ret;
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}
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void eismultiplexer_disconnect(struct eismultiplexer* muliplexer)
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{
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usbshm_distroy(muliplexer->priv);
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free(muliplexer->priv);
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muliplexer->priv = NULL;
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sem_destroy(&muliplexer->readSem);
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}
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