moved from wiringpi to libgpiod

2026-02-19 08:16:31 +00:00 · 2020-09-17 20:33:05 +03:00
parent 2ad8871a54
commit 6725083be6
13 changed files with 200 additions and 114 deletions
--- a/2
+++ b/2
@@ -35,7 +35,7 @@ endif


 ifneq ($(call optbool,$(WITH_GPIO)),)
-_LIBS += -lwiringPi
+_LIBS += -lgpiod
 override CFLAGS += -DWITH_GPIO
 _SRCS += $(shell ls src/gpio/*.c)
 endif
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@
 | Streaming via UNIX domain socket | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Yes | ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) No |
 | Debug logs without recompiling,<br>performance statistics log,<br>access to HTTP streaming parameters | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Yes | ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) No |
 | Option to serve files<br>with a built-in HTTP server | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Yes | ![#ffaa00](https://placehold.it/15/ffaa00/000000?text=+) Regular files only |
-| Signaling about the stream state to GPIO<br>on Raspberry Pi using [wiringPi](http://wiringpi.com) | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Yes | ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) No |
+| Signaling about the stream state to GPIO using [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about) | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Yes | ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) No |
 | Access to webcam controls (focus, servos)<br>and settings such as brightness via HTTP | ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) No | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Yes |

 Footnotes:
@@ -36,10 +36,10 @@ If you're going to live-stream from your backyard webcam and need to control it,
 You'll need  ```make```, ```gcc```, ```libevent``` with ```pthreads``` support, ```libjpeg8```/```libjpeg-turbo```, ```libuuid``` and ```libbsd``` (only for Linux).

 * Arch: `sudo pacman -S libevent libjpeg-turbo libutil-linux libbsd`.
-* Raspbian: `sudo apt install libevent-dev libjpeg8-dev uuid-dev libbsd-dev`. Add `libraspberrypi-dev` for `WITH_OMX=1` and `wiringpi` for `WITH_GPIO=1`.
+* Raspbian: `sudo apt install libevent-dev libjpeg8-dev uuid-dev libbsd-dev`. Add `libraspberrypi-dev` for `WITH_OMX=1` and `libgpiod` for `WITH_GPIO=1`.
 * Debian: `sudo apt install build-essential libevent-dev libjpeg62-turbo-dev uuid-dev libbsd-dev`.

-On Raspberry Pi you can build the program with OpenMAX IL. To do this pass option ```WITH_OMX=1``` to ```make```. To enable GPIO support install [wiringPi](http://wiringpi.com) and pass option ```WITH_GPIO=1```. If the compiler reports about a missing function ```pthread_get_name_np()``` (or similar), add option ```WITH_PTHREAD_NP=0``` (it's enabled by default). For the similar error with ```setproctitle()``` add option ```WITH_SETPROCTITLE=0```.
+On Raspberry Pi you can build the program with OpenMAX IL. To do this pass option ```WITH_OMX=1``` to ```make```. To enable GPIO support install [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about) and pass option ```WITH_GPIO=1```. If the compiler reports about a missing function ```pthread_get_name_np()``` (or similar), add option ```WITH_PTHREAD_NP=0``` (it's enabled by default). For the similar error with ```setproctitle()``` add option ```WITH_SETPROCTITLE=0```.

 ```
 $ git clone --depth=1 https://github.com/pikvm/ustreamer
@@ -48,7 +48,7 @@ $ make
 $ ./ustreamer --help
 ```

-AUR has a package for Arch Linux: https://aur.archlinux.org/packages/ustreamer. It should compile automatically with OpenMAX IL on Raspberry Pi, if the corresponding headers are present in ```/opt/vc/include```. Same with GPIO.  
+AUR has a package for Arch Linux: https://aur.archlinux.org/packages/ustreamer. It should compile automatically with OpenMAX IL on Raspberry Pi, if the corresponding headers are present in ```/opt/vc/include```.  
 FreeBSD port: https://www.freshports.org/multimedia/ustreamer.

 -----
--- a/README.ru.md
+++ b/README.ru.md
@@ -19,7 +19,7 @@
 | Стрим через UNIX domain socket | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Есть | ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) Нет |
 | Дебаг-логи без перекомпиляции,<br>логгирование статистики производительности,<br>возможность получения параметров<br>трансляции по HTTP | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Есть | ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) Нет |
 | Возможность сервить файлы встроенным<br>HTTP-сервером  | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Есть | ![#ffaa00](https://placehold.it/15/ffaa00/000000?text=+) Нет каталогов |
-| Вывод сигналов о состоянии стрима на GPIO<br>на Raspberry Pi с помощью [wiringPi](http://wiringpi.com) | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Есть | ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) Нет |
+| Вывод сигналов о состоянии стрима на GPIO<br>с помощью [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about) | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Есть | ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) Нет |
 | Поддержка контролов веб-камер (фокус,<br> движение сервами) и всяких настроек,<br> типа яркости, через HTTP | ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) Нет | ![#00aa00](https://placehold.it/15/00aa00/000000?text=+) Есть |

 Сносочки:
@@ -36,10 +36,10 @@
 Для сборки вам понадобятся ```make```, ```gcc```, ```libevent``` с поддержкой ```pthreads```, ```libjpeg8```/```libjpeg-turbo```, ```libuuid``` и ```libbsd``` (только для Linux).

 * Arch: `sudo pacman -S libevent libjpeg-turbo libutil-linux libbsd`.
-* Raspbian: `sudo apt install libevent-dev libjpeg8-dev uuid-dev libbsd-dev`.  Добавьте `libraspberrypi-dev` для сборки с `WITH_OMX=1` и `wiringpi` для `WITH_GPIO=1`.
+* Raspbian: `sudo apt install libevent-dev libjpeg8-dev uuid-dev libbsd-dev`.  Добавьте `libraspberrypi-dev` для сборки с `WITH_OMX=1` и `libgpiod` для `WITH_GPIO=1`.
 * Debian: `sudo apt install build-essential libevent-dev libjpeg62-turbo-dev uuid-dev libbsd-dev`.

-На Raspberry Pi программу можно собрать с поддержкой OpenMAX IL. Для этого передайте ```make``` параметр ```WITH_OMX=1```. Для включения сборки с поддержкой GPIO установите [wiringPi](http://wiringpi.com) и добавьте параметр ```WITH_GPIO=1```. Если при сборке компилятор ругается на отсутствие функции ```pthread_get_name_np()``` или другой подобной, добавьте параметр ```WITH_PTHREAD_NP=0``` (по умолчанию он включен). При аналогичной ошибке с функцией ```setproctitle()``` добавьте параметр ```WITH_SETPROCTITLE=0```.
+На Raspberry Pi программу можно собрать с поддержкой OpenMAX IL. Для этого передайте ```make``` параметр ```WITH_OMX=1```. Для включения сборки с поддержкой GPIO установите [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about) и добавьте параметр ```WITH_GPIO=1```. Если при сборке компилятор ругается на отсутствие функции ```pthread_get_name_np()``` или другой подобной, добавьте параметр ```WITH_PTHREAD_NP=0``` (по умолчанию он включен). При аналогичной ошибке с функцией ```setproctitle()``` добавьте параметр ```WITH_SETPROCTITLE=0```.

 ```
 $ git clone --depth=1 https://github.com/pikvm/ustreamer
@@ -48,7 +48,7 @@ $ make
 $ ./ustreamer --help
 ```

-Для Arch Linux в AUR есть готовый пакет: https://aur.archlinux.org/packages/ustreamer. На Raspberry Pi програма автоматически собирается с поддержкой OpenMAX IL, если обнаружит нужные хедеры в ```/opt/vc/include```. То же самое и с GPIO.  
+Для Arch Linux в AUR есть готовый пакет: https://aur.archlinux.org/packages/ustreamer. На Raspberry Pi програма автоматически собирается с поддержкой OpenMAX IL, если обнаружит нужные хедеры в ```/opt/vc/include```.  
 Порт для FreeBSD: https://www.freshports.org/multimedia/ustreamer.

 -----
--- a/pkg/arch/PKGBUILD
+++ b/pkg/arch/PKGBUILD
@@ -9,9 +9,8 @@ pkgdesc="Lightweight and fast MJPG-HTTP streamer"
 url="https://github.com/pikvm/ustreamer"
 license=(GPL)
 arch=(i686 x86_64 armv6h armv7h aarch64)
-depends=(libjpeg libevent libutil-linux libbsd)
+depends=(libjpeg libevent libutil-linux libbsd libgpiod)
 # optional: raspberrypi-firmware for OMX encoder
-# optional: wiringpi for GPIO support
 makedepends=(gcc make)
 source=(${pkgname}::"git+https://github.com/pikvm/ustreamer#commit=v${pkgver}")
 md5sums=(SKIP)
@@ -23,9 +22,8 @@ build() {
 	cp -r $pkgname $pkgname-build
 	cd $pkgname-build

-	local _options=""
+	local _options="WITH_GPIO=1"
 	[ -e /opt/vc/include/IL/OMX_Core.h ] && _options="$_options WITH_OMX=1"
-	[ -e /usr/include/wiringPi.h ] && _options="$_options WITH_GPIO=1"

 	make $_options CFLAGS="$CFLAGS" LDFLAGS="$LDFLAGS" $MAKEFLAGS
 }
--- a/pkg/docker/Dockerfile.arm.cross
+++ b/pkg/docker/Dockerfile.arm.cross
@@ -8,7 +8,7 @@ RUN apt-get update \
 		libjpeg8-dev \
 		libbsd-dev \
 		libraspberrypi-dev \
-		wiringpi \
+		libgpiod-dev \
 	&& rm -rf /var/lib/apt/lists/*

 WORKDIR /build/ustreamer/
@@ -27,7 +27,7 @@ RUN apt-get update \
 		libjpeg8 \
 		uuid \
 		libbsd0 \
-		wiringpi \
+		libgpiod2 \
 	&& rm -rf /var/lib/apt/lists/*

 RUN ["cross-build-end"]
--- a/pkg/docker/Dockerfile.arm.native
+++ b/pkg/docker/Dockerfile.arm.native
@@ -6,7 +6,7 @@ RUN apt-get update \
 		libjpeg8-dev \
 		libbsd-dev \
 		libraspberrypi-dev \
-		wiringpi \
+		libgpiod-dev \
 	&& rm -rf /var/lib/apt/lists/*

 WORKDIR /build/ustreamer/
@@ -22,7 +22,7 @@ RUN apt-get update \
 		libjpeg8 \
 		uuid \
 		libbsd0 \
-		wiringpi \
+		libgpiod2 \
 	&& rm -rf /var/lib/apt/lists/*

 WORKDIR /ustreamer
--- a/pkg/docker/Dockerfile.x64.native
+++ b/pkg/docker/Dockerfile.x64.native
@@ -10,11 +10,12 @@ RUN apt-get update \
 		libjpeg62-turbo-dev \
 		uuid-dev \
 		libbsd-dev \
+		libgpiod-dev \
 	&& rm -rf /var/lib/apt/lists/*

 WORKDIR /build/ustreamer/
 COPY . .
-RUN make -j5
+RUN make -j5 WITH_GPIO=1

 FROM debian:buster-slim as run

@@ -26,6 +27,7 @@ RUN apt-get update \
 		libjpeg62-turbo \
 		uuid \
 		libbsd0 \
+		libgpiod2 \
 	&& rm -rf /var/lib/apt/lists/*

 WORKDIR /ustreamer
--- a/src/gpio/gpio.c
+++ b/src/gpio/gpio.c
@@ -22,8 +22,121 @@

 #include "gpio.h"

+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <assert.h>

-int gpio_pin_prog_running;
-int gpio_pin_stream_online;
-int gpio_pin_has_http_clients;
-int gpio_pin_workers_busy_at;
+#include <pthread.h>
+#include <gpiod.h>
+
+#include "../tools.h"
+#include "../logging.h"
+#include "../threading.h"
+
+
+struct gpio_t gpio = {
+	.path = "/dev/gpiochip0",
+	.consumer_prefix = "ustreamer",
+
+#	define MAKE_OUTPUT(_role) { \
+		.pin = -1, \
+		.role = _role, \
+		.consumer = NULL, \
+		.line = NULL, \
+		.state = false \
+	}
+
+	.prog_running = MAKE_OUTPUT("prog-running"),
+	.stream_online = MAKE_OUTPUT("stream-online"),
+	.has_http_clients = MAKE_OUTPUT("has-http-clients"),
+
+#	undef MAKE_OUTPUT
+
+	// mutex uninitialized
+	.chip = NULL
+};
+
+
+static void _gpio_output_init(struct gpio_output_t *output);
+static void _gpio_output_destroy(struct gpio_output_t *output);
+
+
+void gpio_init(void) {
+	assert(gpio.chip == NULL);
+	if (
+		gpio.prog_running.pin >= 0
+		|| gpio.stream_online.pin >= 0
+		|| gpio.has_http_clients.pin >= 0
+	) {
+		A_MUTEX_INIT(&gpio.mutex);
+		LOG_INFO("GPIO: Using chip device: %s", gpio.path);
+		if ((gpio.chip = gpiod_chip_open(gpio.path)) != NULL) {
+			_gpio_output_init(&gpio.prog_running);
+			_gpio_output_init(&gpio.stream_online);
+			_gpio_output_init(&gpio.has_http_clients);
+		} else {
+			LOG_PERROR("GPIO: Can't initialize chip device %s", gpio.path);
+		}
+	}
+}
+
+void gpio_destroy(void) {
+	_gpio_output_destroy(&gpio.prog_running);
+	_gpio_output_destroy(&gpio.stream_online);
+	_gpio_output_destroy(&gpio.has_http_clients);
+	if (gpio.chip) {
+		gpiod_chip_close(gpio.chip);
+		gpio.chip = NULL;
+		A_MUTEX_DESTROY(&gpio.mutex);
+	}
+}
+
+int gpio_inner_set(struct gpio_output_t *output, bool state) {
+	int retval = 0;
+
+	assert(gpio.chip);
+	assert(output->line);
+	assert(output->state != state); // Must be checked in macro for the performance
+	A_MUTEX_LOCK(&gpio.mutex);
+
+	if (gpiod_line_set_value(output->line, (int)state) < 0) { \
+		LOG_PERROR("GPIO: Can't write value %d to line %s (will be disabled)", state, output->consumer); \
+		_gpio_output_destroy(output);
+		retval = -1;
+	}
+
+	A_MUTEX_UNLOCK(&gpio.mutex);
+	return retval;
+}
+
+static void _gpio_output_init(struct gpio_output_t *output) {
+	assert(gpio.chip);
+	assert(output->line == NULL);
+
+	A_CALLOC(output->consumer, strlen(gpio.consumer_prefix) + strlen(output->role) + 16);
+	sprintf(output->consumer, "%s::%s", gpio.consumer_prefix, output->role);
+
+	if (output->pin >= 0) {
+		if ((output->line = gpiod_chip_get_line(gpio.chip, output->pin)) != NULL) {
+			if (gpiod_line_request_output(output->line, output->consumer, 0) < 0) {
+				LOG_PERROR("GPIO: Can't request pin=%d as %s", output->pin, output->consumer);
+				_gpio_output_destroy(output);
+			}
+		} else {
+			LOG_PERROR("GPIO: Can't get pin=%d as %s", output->pin, output->consumer);
+		}
+	}
+}
+
+static void _gpio_output_destroy(struct gpio_output_t *output) {
+	if (output->line) {
+		gpiod_line_release(output->line);
+		output->line = NULL;
+	}
+	if (output->consumer) {
+		free(output->consumer);
+		output->consumer = NULL;
+	}
+	output->state = false;
+}
--- a/src/gpio/gpio.h
+++ b/src/gpio/gpio.h
@@ -22,75 +22,62 @@

 #pragma once

-#include <stdlib.h>
+#include <stdbool.h>

-#include <wiringPi.h>
+#include <pthread.h>
+#include <gpiod.h>

 #include "../tools.h"
 #include "../logging.h"


-extern int gpio_pin_prog_running;
-extern int gpio_pin_stream_online;
-extern int gpio_pin_has_http_clients;
-extern int gpio_pin_workers_busy_at;
+struct gpio_output_t {
+	int					pin;
+	const char			*role;
+	char 				*consumer;
+	struct gpiod_line	*line;
+	bool				state;
+};
+
+struct gpio_t {
+	char *path;
+	char *consumer_prefix;
+
+	struct gpio_output_t prog_running;
+	struct gpio_output_t stream_online;
+	struct gpio_output_t has_http_clients;
+
+	pthread_mutex_t		mutex;
+	struct gpiod_chip	*chip;
+};


-#define GPIO_INIT { \
-		gpio_pin_prog_running = -1; \
-		gpio_pin_stream_online = -1; \
-		gpio_pin_has_http_clients = -1; \
-		gpio_pin_workers_busy_at = -1; \
-	}
+extern struct gpio_t gpio;

-#define GPIO_INIT_PIN(_role, _offset) _gpio_init_pin(#_role, gpio_pin_##_role, _offset)

-INLINE void _gpio_init_pin(const char *role, int base, unsigned offset) {
-	if (base >= 0) {
-		pinMode(base + offset, OUTPUT);
-		if (offset == 0) {
-			LOG_INFO("GPIO: Using pin %d as %s", base, role);
-		} else {
-			LOG_INFO("GPIO: Using pin %d+%u as %s", base, offset, role);
-		}
-	}
-}
+void gpio_init(void);
+void gpio_destroy(void);
+int gpio_inner_set(struct gpio_output_t *output, bool state);

-#define GPIO_INIT_PINOUT { \
-		if ( \
-			gpio_pin_prog_running >= 0 \
-			|| gpio_pin_stream_online >= 0 \
-			|| gpio_pin_has_http_clients >= 0 \
-			|| gpio_pin_workers_busy_at >= 0 \
-		) { \
-			LOG_INFO("GPIO: Using wiringPi"); \
-			if (wiringPiSetupGpio() < 0) { \
-				LOG_PERROR("GPIO: Can't initialize wiringPi"); \
-				exit(1); \
-			} else { \
-				GPIO_INIT_PIN(prog_running, 0); \
-				GPIO_INIT_PIN(stream_online, 0); \
-				GPIO_INIT_PIN(has_http_clients, 0); \
-				GPIO_INIT_PIN(workers_busy_at, 0); \
+
+#define SET_STATE(_output, _state) { \
+		if (_output.line && _output.state != _state) { \
+			if (!gpio_inner_set(&_output, _state)) { \
+				_output.state = _state; \
 			} \
 		} \
 	}

-#define GPIO_SET_STATE(_role, _offset, _state) _gpio_set_state(#_role, gpio_pin_##_role, _offset, _state)
-
-INLINE void _gpio_set_state(const char *role, int base, unsigned offset, int state) {
-	if (base >= 0) {
-		if (offset == 0) {
-			LOG_DEBUG("GPIO: Writing %d to pin %d (%s)", state, base, role);
-		} else {
-			LOG_DEBUG("GPIO: Writing %d to pin %d+%u (%s)", state, base, offset, role);
-		}
-		digitalWrite(base + offset, state);
-	}
+INLINE void gpio_set_prog_running(bool state) {
+	SET_STATE(gpio.prog_running, state);
 }

-#define GPIO_SET_LOW(_role)		GPIO_SET_STATE(_role, 0, LOW)
-#define GPIO_SET_HIGH(_role)	GPIO_SET_STATE(_role, 0, HIGH)
+INLINE void gpio_set_stream_online(bool state) {
+	SET_STATE(gpio.stream_online, state);
+}

-#define GPIO_SET_LOW_AT(_role, _offset)		GPIO_SET_STATE(_role, _offset, LOW)
-#define GPIO_SET_HIGH_AT(_role, _offset)	GPIO_SET_STATE(_role, _offset, HIGH)
+INLINE void gpio_set_has_http_clients(bool state) {
+	SET_STATE(gpio.has_http_clients, state);
+}
+
+#undef SET_STATE
--- a/src/http/server.c
+++ b/src/http/server.c
@@ -537,7 +537,7 @@ static void _http_callback_stream(struct evhttp_request *request, void *v_server
 			}

 #			ifdef WITH_GPIO
-			GPIO_SET_HIGH(has_http_clients);
+			gpio_set_has_http_clients(true);
 #			endif
 		}

@@ -711,7 +711,7 @@ static void _http_callback_stream_error(UNUSED struct bufferevent *buf_event, UN
 		}

 #		ifdef WITH_GPIO
-		GPIO_SET_LOW(has_http_clients);
+		gpio_set_has_http_clients(false);
 #		endif
 	}

--- a/src/main.c
+++ b/src/main.c
@@ -31,6 +31,7 @@
 #endif

 #include <stdio.h>
+#include <stdbool.h>
 #include <signal.h>

 #include <pthread.h>
@@ -114,10 +115,6 @@ int main(int argc, char *argv[]) {
 	A_THREAD_RENAME("main");
 	options = options_init(argc, argv);

-#	ifdef WITH_GPIO
-	GPIO_INIT;
-#	endif
-
 	dev = device_init();
 	encoder = encoder_init();
 	stream = stream_init(dev, encoder);
@@ -125,7 +122,7 @@ int main(int argc, char *argv[]) {

 	if ((exit_code = options_parse(options, dev, encoder, server)) == 0) {
 #		ifdef WITH_GPIO
-		GPIO_INIT_PINOUT;
+		gpio_init();
 #		endif

 		_install_signal_handlers();
@@ -140,7 +137,7 @@ int main(int argc, char *argv[]) {

 		if ((exit_code = http_server_listen(server)) == 0) {
 #			ifdef WITH_GPIO
-			GPIO_SET_HIGH(prog_running);
+			gpio_set_prog_running(true);
 #			endif

 			A_THREAD_CREATE(&stream_loop_tid, _stream_loop_thread, NULL);
@@ -148,6 +145,11 @@ int main(int argc, char *argv[]) {
 			A_THREAD_JOIN(server_loop_tid);
 			A_THREAD_JOIN(stream_loop_tid);
 		}
+
+#		ifdef WITH_GPIO
+		gpio_set_prog_running(false);
+		gpio_destroy();
+#		endif
 	}

 	http_server_destroy(server);
@@ -155,10 +157,6 @@ int main(int argc, char *argv[]) {
 	encoder_destroy(encoder);
 	device_destroy(dev);

-#	ifdef WITH_GPIO
-	GPIO_SET_LOW(prog_running);
-#	endif
-
 	options_destroy(options);
 	if (exit_code == 0) {
 		LOG_INFO("Bye-bye");
--- a/src/options.c
+++ b/src/options.c
@@ -103,10 +103,11 @@ enum _OPT_VALUES {
 	_O_SERVER_TIMEOUT,

 #ifdef WITH_GPIO
+	_O_GPIO_DEVICE,
+	_O_GPIO_CONSUMER_PREFIX,
 	_O_GPIO_PROG_RUNNING,
 	_O_GPIO_STREAM_ONLINE,
 	_O_GPIO_HAS_HTTP_CLIENTS,
-	_O_GPIO_WORKERS_BUSY_AT,
 #endif

 #ifdef HAS_PDEATHSIG
@@ -179,10 +180,11 @@ static const struct option _LONG_OPTS[] = {
 	{"server-timeout",			required_argument,	NULL,	_O_SERVER_TIMEOUT},

 #ifdef WITH_GPIO
+	{"gpio-device",				required_argument,	NULL,	_O_GPIO_DEVICE},
+	{"gpio-consumer-prefix",	required_argument,	NULL,	_O_GPIO_CONSUMER_PREFIX},
 	{"gpio-prog-running",		required_argument,	NULL,	_O_GPIO_PROG_RUNNING},
 	{"gpio-stream-online",		required_argument,	NULL,	_O_GPIO_STREAM_ONLINE},
 	{"gpio-has-http-clients",	required_argument,	NULL,	_O_GPIO_HAS_HTTP_CLIENTS},
-	{"gpio-workers-busy-at",	required_argument,	NULL,	_O_GPIO_WORKERS_BUSY_AT},
 #endif

 #ifdef HAS_PDEATHSIG
@@ -400,10 +402,11 @@ int options_parse(struct options_t *options, struct device_t *dev, struct encode
 			case _O_SERVER_TIMEOUT:		OPT_NUMBER("--server-timeout", server->timeout, 1, 60, 0);

 #			ifdef WITH_GPIO
-			case _O_GPIO_PROG_RUNNING:		OPT_NUMBER("--gpio-prog-running", gpio_pin_prog_running, 0, 256, 0);
-			case _O_GPIO_STREAM_ONLINE:		OPT_NUMBER("--gpio-stream-online", gpio_pin_stream_online, 0, 256, 0);
-			case _O_GPIO_HAS_HTTP_CLIENTS:	OPT_NUMBER("--gpio-has-http-clients", gpio_pin_has_http_clients, 0, 256, 0);
-			case _O_GPIO_WORKERS_BUSY_AT:	OPT_NUMBER("--gpio-workers-busy-at", gpio_pin_workers_busy_at, 0, 256, 0);
+			case _O_GPIO_DEVICE:			OPT_SET(gpio.path, optarg);
+			case _O_GPIO_CONSUMER_PREFIX:	OPT_SET(gpio.consumer_prefix, optarg);
+			case _O_GPIO_PROG_RUNNING:		OPT_NUMBER("--gpio-prog-running", gpio.prog_running.pin, 0, 256, 0);
+			case _O_GPIO_STREAM_ONLINE:		OPT_NUMBER("--gpio-stream-online", gpio.stream_online.pin, 0, 256, 0);
+			case _O_GPIO_HAS_HTTP_CLIENTS:	OPT_NUMBER("--gpio-has-http-clients", gpio.has_http_clients.pin, 0, 256, 0);
 #			endif

 #			ifdef HAS_PDEATHSIG
@@ -646,11 +649,11 @@ static void _help(struct device_t *dev, struct encoder_t *encoder, struct http_s
 #ifdef WITH_GPIO
 	printf("GPIO options:\n");
 	printf("═════════════\n");
+	printf("    --gpio-device </dev/path>  ───── Path to GPIO character device. Default: %s.\n\n", gpio.path);
+	printf("    --gpio-consumer-prefix <str>  ── Consumer prefix for GPIO outputs. Default: %s.\n\n", gpio.consumer_prefix);
 	printf("    --gpio-prog-running <pin>  ───── Set 1 on GPIO pin while uStreamer is running. Default: disabled.\n\n");
 	printf("    --gpio-stream-online <pin>  ──── Set 1 while streaming. Default: disabled\n\n");
 	printf("    --gpio-has-http-clients <pin>  ─ Set 1 while stream has at least one client. Default: disabled.\n\n");
-	printf("    --gpio-workers-busy-at <pin>  ── Set 1 on (pin + N) while worker with number N has a job.\n");
-	printf("                                     The worker's numbering starts from 0. Default: disabled\n\n");
 #endif
 #if (defined(HAS_PDEATHSIG) || defined(WITH_SETPROCTITLE))
 	printf("Process options:\n");
--- a/src/stream.c
+++ b/src/stream.c
@@ -185,7 +185,7 @@ void stream_loop(struct stream_t *stream) {

 			} else if (selected == 0) {
 #				ifdef WITH_GPIO
-				GPIO_SET_LOW(stream_online);
+				gpio_set_stream_online(false);
 #				endif

 				if (stream->dev->persistent) {
@@ -207,7 +207,7 @@ void stream_loop(struct stream_t *stream) {
 					LOG_DEBUG("Frame is ready");

 #					ifdef WITH_GPIO
-					GPIO_SET_HIGH(stream_online);
+					gpio_set_stream_online(true);
 #					endif

 					int buf_index;
@@ -288,7 +288,7 @@ void stream_loop(struct stream_t *stream) {
 		device_close(stream->dev);

 #		ifdef WITH_GPIO
-		GPIO_SET_LOW(stream_online);
+		gpio_set_stream_online(false);
 #		endif
 	}
 }
@@ -431,17 +431,9 @@ static void *_worker_thread(void *v_worker) {
 	A_THREAD_RENAME("worker-%u", worker->number);
 	LOG_DEBUG("Hello! I am a worker #%u ^_^", worker->number);

-#	ifdef WITH_GPIO
-	GPIO_INIT_PIN(workers_busy_at, worker->number);
-#	endif
-
 	while (!atomic_load(worker->proc_stop) && !atomic_load(worker->workers_stop)) {
 		LOG_DEBUG("Worker %u waiting for a new job ...", worker->number);

-#		ifdef WITH_GPIO
-		GPIO_SET_LOW_AT(workers_busy_at, worker->number);
-#		endif
-
 		A_MUTEX_LOCK(&worker->has_job_mutex);
 		A_COND_WAIT_TRUE(atomic_load(&worker->has_job), &worker->has_job_cond, &worker->has_job_mutex);
 		A_MUTEX_UNLOCK(&worker->has_job_mutex);
@@ -451,10 +443,6 @@ static void *_worker_thread(void *v_worker) {

 			LOG_DEBUG("Worker %u compressing JPEG from buffer %u ...", worker->number, worker->buf_index);

-#			ifdef WITH_GPIO
-			GPIO_SET_HIGH_AT(workers_busy_at, worker->number);
-#			endif
-
 			worker->job_failed = (bool)encoder_compress_buffer(worker->encoder, worker->dev, worker->number, worker->buf_index);

 			if (device_release_buffer(worker->dev, worker->buf_index) == 0) {
@@ -483,9 +471,6 @@ static void *_worker_thread(void *v_worker) {
 	}

 	LOG_DEBUG("Bye-bye (worker %u)", worker->number);
-#	ifdef WITH_GPIO
-	GPIO_SET_LOW_AT(workers_busy_at, worker->number);
-#	endif
 	return NULL;
 }