Mirrors_Framework/c-periphery
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gpio: add conditional compilation of cdev implementation

Browse Source 
with special thanks to Ryan Barnett <ryan.barnett@rockwellcollins.com>
for the original implementation.
This commit is contained in:
Vanya A. Sergeev
2020-07-24 01:07:04 -05:00
parent caadb461d3
commit 05262e6dc8
3 changed files with 29 additions and 5 deletions
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9
CMakeLists.txt
View File

@@ -3,12 +3,13 @@ project(periphery C)
option(BUILD_TESTS "Build test programs" ON)
# Check for Linux kernel headers
# Check for Linux kernel header files for character device GPIO support
include(CheckIncludeFiles)
CHECK_INCLUDE_FILES(linux/gpio.h HAVE_LINUX_HEADERS)
if(NOT HAVE_LINUX_HEADERS)
message(FATAL_ERROR "c-periphery needs Linux kernel headers")
CHECK_INCLUDE_FILES(linux/gpio.h HAVE_CDEV_GPIO_HEADERS)
if(NOT HAVE_CDEV_GPIO_HEADERS)
message(WARNING "Linux kernel header files not found for character device GPIO support. c-periphery will be built with legacy sysfs GPIO support only.")
endif()
add_definitions(-DPERIPHERY_GPIO_CDEV_SUPPORT=$<BOOL:${HAVE_CDEV_GPIO_HEADERS}>)
# Library version
set(VERSION "2.2.1")

4
Makefile
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@@ -4,6 +4,8 @@ SRCS = src/gpio.c src/led.c src/pwm.c src/spi.c src/i2c.c src/mmio.c src/serial.
SRCDIR = src
OBJDIR = obj
PERIPHERY_GPIO_CDEV_SUPPORT ?= 1
TEST_PROGRAMS = $(basename $(wildcard tests/*.c))
###########################################################################
@@ -14,7 +16,7 @@ COMMIT_ID := $(shell git describe --abbrev --always --tags --dirty 2>/dev/null |
CFLAGS += -std=gnu99 -pedantic
CFLAGS += -Wall -Wextra -Wno-unused-parameter $(DEBUG) -fPIC
CFLAGS += -DPERIPHERY_VERSION_COMMIT=\"$(COMMIT_ID)\"
CFLAGS += -DPERIPHERY_VERSION_COMMIT=\"$(COMMIT_ID)\" -DPERIPHERY_GPIO_CDEV_SUPPORT=$(PERIPHERY_GPIO_CDEV_SUPPORT)
LDFLAGS +=
ifdef CROSS_COMPILE

21
src/gpio.c
View File

@@ -20,7 +20,10 @@
#include <errno.h>
#include <sys/ioctl.h>
#if PERIPHERY_GPIO_CDEV_SUPPORT
#include <linux/gpio.h>
#endif
#include "gpio.h"
@@ -837,6 +840,8 @@ int gpio_open_sysfs(gpio_t *gpio, unsigned int line, gpio_direction_t direction)
/* cdev implementation */
/*********************************************************************************/
#if PERIPHERY_GPIO_CDEV_SUPPORT
static int _gpio_cdev_reopen(gpio_t *gpio, gpio_direction_t direction, gpio_edge_t edge, gpio_bias_t bias, gpio_drive_t drive, bool inverted) {
uint32_t flags = 0;
@@ -1362,3 +1367,19 @@ int gpio_open_name(gpio_t *gpio, const char *path, const char *name, gpio_direct
return gpio_open_name_advanced(gpio, path, name, &config);
}
#else /* PERIPHERY_GPIO_CDEV_SUPPORT */
int gpio_open_advanced(gpio_t *gpio, const char *path, unsigned int line, const gpio_config_t *config) {
return _gpio_error(gpio, GPIO_ERROR_UNSUPPORTED, 0, "c-periphery library built without character device GPIO support.");
}
int gpio_open_name_advanced(gpio_t *gpio, const char *path, const char *name, const gpio_config_t *config) {
return _gpio_error(gpio, GPIO_ERROR_UNSUPPORTED, 0, "c-periphery library built without character device GPIO support.");
}
int gpio_open(gpio_t *gpio, const char *path, unsigned int line, gpio_direction_t direction) {
return _gpio_error(gpio, GPIO_ERROR_UNSUPPORTED, 0, "c-periphery library built without character device GPIO support.");
}
#endif