/*********************************************************************************
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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: hal.c
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* Description: This file is RPi HAL(Hardware Abstract Layer) initial 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 "tsl2561.h"
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#include "hal.h"
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#define RPI_GPIONAME "gpiochip0"
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static struct gpiod_chip *s_chip;
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static struct gpiod_line *s_light_lines[LIGHT_MAX]; /* relay GPIO lines */
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static struct gpiod_line *s_infrared_lines; /* infrared GPIO lines */
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static int s_light_cnt;
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int hal_init(hal_ctx_t *ctx)
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{
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int i;
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if(!ctx)
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{
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log_err("Invalid input arguments\n");
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return -1;
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}
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/* current configure light counts */
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s_light_cnt = ctx->light_cnt;
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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 get gpio lines and request relay pin as output */
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for(i=0; i<ctx->light_cnt; i++)
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{
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s_light_lines[i] = gpiod_chip_get_line(s_chip, ctx->light_pins[i]);
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if( !s_light_lines[i] )
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{
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log_err("gpiod get line for pin[%d] failure\n", ctx->light_pins[i]);
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return -2;
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}
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gpiod_line_request_output(s_light_lines[i], "lightd", RELAY_INACTVLEVEL);
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}
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log_nrml("gpiod initialise request relay pins output ok\n");
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/* gpiod get gpio lines and request infrared pin as input */
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if( ctx->infrared_pin )
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{
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s_infrared_lines = gpiod_chip_get_line(s_chip, ctx->infrared_pin);
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gpiod_line_request_rising_edge_events(s_infrared_lines, "infrared");
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log_err("infrared GPIO input lines request for rising edge event ok\n");
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}
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if( tsl2561_init()< 0 )
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{
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log_err("LUX sensor TSL2561 initialise failure\n");
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return -2;
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}
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return 0;
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}
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void hal_term(hal_ctx_t *ctx)
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{
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int i;
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if(!ctx)
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{
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log_err("Invalid input arguments\n");
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return ;
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}
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for(i=0; i<ctx->light_cnt; i++)
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{
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gpiod_line_release(s_light_lines[i]);
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}
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gpiod_line_release(s_infrared_lines);
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gpiod_chip_close(s_chip);
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return ;
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}
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void turn_light(int which, int cmd)
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{
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if( which >= s_light_cnt )
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{
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log_err("light[%d] not support in configure file\n", which);
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return ;
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}
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if( OFF == cmd )
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{
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gpiod_line_set_value(s_light_lines[which], RELAY_INACTVLEVEL);
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}
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else
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{
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gpiod_line_set_value(s_light_lines[which], RELAY_ACTVLEVEL);
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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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struct gpiod_line_event event;
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/* This function will block, must call it to setup */
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if( gpiod_line_event_wait(s_infrared_lines, NULL) < 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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/* This function will block, must read to clear the event */
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if (gpiod_line_event_read(s_infrared_lines, &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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