/*********************************************************************************
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* Copyright: (C) 2019 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: gpio.c
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* Description: This file is GPIO input/output functions
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*
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* Version: 1.0.0(2019年06月24日)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "2019年06月24日 23时46分47秒"
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*
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********************************************************************************/
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#include "lylib/logger.h"
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#include "gpio.h"
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#define RPI_GPIONAME "gpiochip0"
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static struct gpiod_chip *s_chip;
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static gpio_t *s_gpio = NULL;
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int gpio_init(gpio_t *gpio)
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{
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int i;
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gpio_info_t *gpioinfo;
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s_gpio = gpio;
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if( !gpio )
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{
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log_err("Invalid input arguments $gpio\n");
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return -1;
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}
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if( !gpio->incnt && !gpio->outcnt )
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{
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log_warn("WARNNING: No GPIO pins configured\n");
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return 0;
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}
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/* gpiod open chip */
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s_chip = gpiod_chip_open_by_name(RPI_GPIONAME);
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if( !s_chip )
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{
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log_err("gpiod open chip failure, maybe you need running as root\n");
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return -2;
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}
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log_nrml("gpiod initialise open chip ok\n");
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/* gpiod request all output pins */
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for(i=0; i<gpio->outcnt; i++)
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{
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gpio->output[i].line = gpiod_chip_get_line(s_chip, gpio->output[i].pin);
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if( !gpio->output[i].line )
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{
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log_err("gpiod get line for '%s' pin[#%d] failure\n", gpio->output[i].name, gpio->output[i].pin );
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return -2;
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}
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gpiod_line_request_output(gpio->output[i].line, gpio->output[i].name, !gpio->output[i].active_level);
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log_nrml("gpiod request '%s' pin[#%d] output ok\n", gpio->output[i].name, gpio->output[i].pin);
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}
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/* gpiod request all input pins */
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for(i=0; i<gpio->incnt; i++)
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{
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gpio->input[i].line = gpiod_chip_get_line(s_chip, gpio->input[i].pin);
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if( !gpio->input[i].line )
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{
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log_err("gpiod get line for '%s' pin[#%d] failure\n", gpio->input[i].name, gpio->input[i].pin );
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return -2;
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}
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if( gpio->output[i].active_level )
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{
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gpiod_line_request_rising_edge_events(gpio->input[i].line, gpio->input[i].name);
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log_nrml("gpiod request '%s' pin[#%d] for rising edge event ok\n", gpio->input[i].name, gpio->input[i].pin);
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}
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else
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{
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gpiod_line_request_falling_edge_events(gpio->input[i].line, gpio->input[i].name);
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log_nrml("gpiod request '%s' pin[#%d] for falling edge event ok\n", gpio->input[i].name, gpio->input[i].pin);
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}
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}
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}
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void gpio_term(void)
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{
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int i;
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log_nrml("start teriminated GPIO\n");
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if( !s_gpio->incnt && !s_gpio->outcnt )
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{
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return ;
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}
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for(i=0; i<s_gpio->outcnt; i++)
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{
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gpiod_line_release(s_gpio->output[i].line);
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}
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for(i=0; i<s_gpio->incnt; i++)
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{
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gpiod_line_release(s_gpio->input[i].line);
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}
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gpiod_chip_close(s_chip);
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}
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void gpio_out(char *name, char *cmd)
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{
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int i;
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int found = 0;
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for( i=0; i<s_gpio->outcnt; i++ )
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{
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if( !strncasecmp(s_gpio->output[i].name, name, strlen(name)))
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{
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found = 1;
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break;
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}
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}
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if( !found )
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{
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log_err("GPIO output for '%s' pin not found\n", name);
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return ;
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}
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if( strstr(cmd, "on") )
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{
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gpiod_line_set_value(s_gpio->output[i].line, s_gpio->output[i].active_level);
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}
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else if( strstr(cmd, "off") )
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{
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gpiod_line_set_value(s_gpio->output[i].line, !s_gpio->output[i].active_level);
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}
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return ;
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}
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/* Return value: 1(HIGH): Sombody detected 0(LOW): Nobody detected */
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int infrared_detect(void)
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{
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int i;
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int rv;
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struct gpiod_line_event event;
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for(i=0; i<s_gpio->incnt; i++)
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{
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if( strstr(s_gpio->input[i].name, "infrared"))
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{
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log_dbg("Start detect '%s' on pin[#%d]\n", s_gpio->input[i].name, s_gpio->input[i].pin);
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/* This function will block, must call it to setup */
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rv = gpiod_line_event_wait(s_gpio->input[i].line, NULL) ;
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if( rv< 0 )
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{
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log_err("infrared gpiod line wait event failure!\n");
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return 0;
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}
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log_err("infrared gpiod line wait event rv=%d!\n", rv);
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/* This function will block, must read to clear the event */
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if (gpiod_line_event_read(s_gpio->input[i].line, &event) < 0)
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{
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log_err("gpiod line event read failure!\n");
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return 0;
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}
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if (event.event_type == GPIOD_LINE_EVENT_RISING_EDGE)
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return 1;
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else
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return 0;
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}
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}
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}
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