/*********************************************************************************
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* Copyright: (C) 2024 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: relay.h
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* Description: This file is used to control relay
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*
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*
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* Pin connection:
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* Relay Module IGKBoard-IMX6ULL
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* VCC <-----> 5V
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* I <-----> #Pin37 (GPIO5_IO08)
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* GND <-----> GND
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*
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********************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <string.h>
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#include <time.h>
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#include <errno.h>
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#include <signal.h>
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#include <getopt.h>
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#include <libgen.h>
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#include "relay.h"
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static inline void msleep(unsigned long ms);
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static void program_usage(const char *progname)
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{
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printf("Usage: %s [OPTION]...\n", progname);
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printf(" This is relay control program. \n");
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printf(" -r[relay ] Specify relay device, such as 0\n");
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printf(" -s[status ] Specify relay status, 0 for open, 1 for close\n");
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printf(" -h[help ] Display this help information\n");
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printf("\n");
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printf("%s program Version v1.0.0\n", progname);
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printf("Copyright (C) 2023 LingYun IoT System Studio.\n");
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return;
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}
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int main(int argc, char *argv[])
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{
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char *progname=NULL;
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int rv;
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int which = -1;
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int status = ON;
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struct option long_options[] = {
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{"relay", required_argument, NULL, 'r'},
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{"status", required_argument, NULL, 's'},
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{"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, 0}
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};
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progname = basename(argv[0]);
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/* Parser the command line parameters */
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while ((rv = getopt_long(argc, argv, "r:s:h", long_options, NULL)) != -1)
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{
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switch (rv)
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{
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case 'r': /* Set relay number, such as 0...max */
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which = atoi(optarg);
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break;
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case 's': /* Set relay status, 0 for open and 1 for close */
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status = atoi(optarg);
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break;
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case 'h': /* Get help information */
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program_usage(progname);
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return 0;
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default:
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break;
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}
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}
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if( (rv=init_relay()) < 0 )
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{
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printf("initial relays gpio failure, rv=%d\n", rv);
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return 1;
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}
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turn_relay(which, status);
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term_relay();
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return 0;
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}
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/*+----------------------------------+
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*| Relay API based on libgpiod v2.0 |
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*+----------------------------------+*/
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static relay_t relays_info[RELAY_CNT] =
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{
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{"relay1", 4, 8, ACTIVE_HIGH, 0, NULL}, /* #Pin37, GPIO5_IO08 on chip4 line 8, active high */
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};
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/* relays context */
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static relays_t relays =
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{
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.relays = relays_info,
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.count = RELAY_CNT,
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};
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int init_relay(void)
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{
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relay_t *relay;
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int i, rv = 0;
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char chip_dev[32];
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struct gpiod_chip *chip; /* gpio chip */
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struct gpiod_line_settings *settings; /* gpio direction, bias, active_low, value */
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struct gpiod_line_config *line_cfg; /* gpio line */
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struct gpiod_request_config *req_cfg; /* gpio consumer, it can be NULL */
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/* defined in libgpiod-2.0/lib/line-settings.c:
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struct gpiod_line_settings {
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enum gpiod_line_direction direction;
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enum gpiod_line_edge edge_detection;
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enum gpiod_line_drive drive;
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enum gpiod_line_bias bias;
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bool active_low;
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enum gpiod_line_clock event_clock;
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long debounce_period_us;
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enum gpiod_line_value output_value;
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};
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*/
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settings = gpiod_line_settings_new();
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if (!settings)
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{
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printf("unable to allocate line settings\n");
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rv = -2;
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goto cleanup;
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}
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/* defined in libgpiod-2.0/lib/line-config.c
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struct gpiod_line_config {
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struct per_line_config line_configs[LINES_MAX];
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size_t num_configs;
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enum gpiod_line_value output_values[LINES_MAX];
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size_t num_output_values;
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struct settings_node *sref_list;
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};
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*/
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line_cfg = gpiod_line_config_new();
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if (!line_cfg)
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{
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printf("unable to allocate the line config structure");
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rv = -2;
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goto cleanup;
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}
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/* defined in libgpiod-2.0/lib/request-config.c:
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struct gpiod_request_config {
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char consumer[GPIO_MAX_NAME_SIZE];
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size_t event_buffer_size;
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};
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*/
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req_cfg = gpiod_request_config_new();
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if (!req_cfg)
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{
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printf("unable to allocate the request config structure");
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rv = -2;
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goto cleanup;
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}
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for(i=0; i<relays.count; i++)
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{
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relay = &relays.relays[i];
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snprintf(chip_dev, sizeof(chip_dev), "/dev/gpiochip%d", relay->chip_num);
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chip = gpiod_chip_open(chip_dev);
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if( !chip )
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{
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printf("open gpiochip failure, maybe you need running as root\n");
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rv = -3;
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goto cleanup;
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}
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/* Set as output direction, active low and default level as inactive */
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gpiod_line_settings_reset(settings);
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gpiod_line_settings_set_direction(settings, GPIOD_LINE_DIRECTION_OUTPUT);
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gpiod_line_settings_set_active_low(settings, relay->active);
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gpiod_line_settings_set_output_value(settings, GPIOD_LINE_VALUE_INACTIVE);
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/* set gpio line */
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gpiod_line_config_reset(line_cfg);
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gpiod_line_config_add_line_settings(line_cfg, &relay->gpio_num, 1, settings);
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/* Can be NULL for default settings. */
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gpiod_request_config_set_consumer(req_cfg, relay->name);
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/* Request a set of lines for exclusive usage. */
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relay->request = gpiod_chip_request_lines(chip, req_cfg, line_cfg);
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gpiod_chip_close(chip);
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//printf("request %5s relay[%d] for gpio output okay\n", relay->name, relay->gpio);
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}
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cleanup:
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if( rv< 0 )
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term_relay();
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if( line_cfg )
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gpiod_line_config_free(line_cfg);
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if( req_cfg )
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gpiod_request_config_free(req_cfg);
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if( settings )
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gpiod_line_settings_free(settings);
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return rv;
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}
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int term_relay(void)
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{
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int i;
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relay_t *relay;
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printf("terminate relay gpios\n");
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for(i=0; i<relays.count; i++)
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{
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relay = &relays.relays[i];
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if( relay->request )
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{
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turn_relay(i, OFF);
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gpiod_line_request_release(relay->request);
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}
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}
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return 0;
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}
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int turn_relay(int which, int cmd)
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{
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relay_t *relay;
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int rv = 0;
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int value = 0;
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if( which<0 || which>=relays.count )
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{
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printf("Invalid input arguments\n");
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return -1;
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}
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relay = &relays.relays[which];
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value = OFF==cmd ? GPIOD_LINE_VALUE_INACTIVE : GPIOD_LINE_VALUE_ACTIVE;
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gpiod_line_request_set_value(relay->request, relay->gpio_num, value);
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relay->status = OFF==cmd ? OFF : ON;
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return 0;
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}
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int toggle_relay(int which)
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{
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relay_t *relay;
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if( which<0 || which>=relays.count )
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{
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printf("Invalid input arguments\n");
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return -1;
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}
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relay = &relays.relays[which];
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return turn_relay(which, !relay->status);
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}
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/*+-------------------------------+
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*| Misc functions API |
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*+-------------------------------+*/
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static inline void msleep(unsigned long ms)
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{
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struct timespec cSleep;
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unsigned long ulTmp;
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cSleep.tv_sec = ms / 1000;
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if (cSleep.tv_sec == 0)
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{
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ulTmp = ms * 10000;
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cSleep.tv_nsec = ulTmp * 100;
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}
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else
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{
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cSleep.tv_nsec = 0;
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}
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nanosleep(&cSleep, 0);
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return ;
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}
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