BBIO_err gpio_unexport(unsigned int gpio)
{
int fd, len;
char str_gpio[10];
//If gpio is not exported by us - no need to do anything
if (exported_gpios[gpio] != GPIO_EXPORTED)
return 0;
//close gpio pin file descriptor
close_value_fd(gpio);
#define GPIO_UNEXPORT "/sys/class/gpio/unexport"
if ((fd = open(GPIO_UNEXPORT, O_WRONLY)) < 0) {
syslog(LOG_ERR, "Adafruit_BBIO: gpio_unexport(): %u couldn't open '"GPIO_UNEXPORT"': %i-%s",
gpio, errno, strerror(errno));
return BBIO_SYSFS;
}
len = snprintf(str_gpio, sizeof(str_gpio), "%d", gpio);
int ret = write(fd, str_gpio, len);
close(fd);
if (ret < 0) {
syslog(LOG_ERR, "Adafruit_BBIO: gpio_unexport(): %u couldn't write '"GPIO_UNEXPORT"': %i-%s",
gpio, errno, strerror(errno));
return BBIO_SYSFS;
}
// remove from list
exported_gpios[gpio] = GPIO_NOT_EXPORTED;
syslog(LOG_DEBUG, "Adafruit_BBIO: gpio_unexport(): %u OK", gpio);
return BBIO_OK;
}
int gpio_unexport(unsigned int gpio)
{
int fd, len;
char str_gpio[3];
struct gpio_exp *g, *temp, *prev_g = NULL;
close_value_fd(gpio);
if ((fd = open("/sys/class/gpio/unexport", O_WRONLY)) < 0)
return -1;
len = snprintf(str_gpio, sizeof(str_gpio), "%d", gpio);
write(fd, str_gpio, len);
close(fd);
// remove from list
g = exported_gpios;
while (g != NULL)
{
if (g->gpio == gpio)
{
if (prev_g == NULL)
exported_gpios = g->next;
else
prev_g->next = g->next;
temp = g;
g = g->next;
free(temp);
} else {
prev_g = g;
g = g->next;
}
}
return 0;
}
void remove_edge_detect(unsigned int gpio)
{
struct epoll_event ev;
int fd = fd_lookup(gpio);
// delete callbacks for gpio
remove_callbacks(gpio);
// delete epoll of fd
epoll_ctl(epfd, EPOLL_CTL_DEL, fd, &ev);
// close fd and remove from list
close_value_fd(gpio);
// set edge to none
gpio_set_edge(gpio, NO_EDGE);
// unexport gpio
gpio_unexport(gpio);
// clear detected flag
event_occurred[gpio] = 0;
}
