Add libgpiod support

Author: ew1abz

.gitignore

@@ -109,5 +109,5 @@ $RECYCLE.BIN/
 *.dSYM
 
 # cmake
-build/
+build*/
 tmp/

CMakeLists.txt

@@ -143,8 +143,8 @@ elseif(APPLE)
   message(STATUS "RPATH support: ${CMAKE_MACOSX_RPATH}")
 
 elseif (WIN32)
-  if(NOT VS2015 AND NOT VS2017)
-    message(FATAL_ERROR "You must use Microsoft Visual Studio 2015 or 2017 as compiler")
+  if(NOT VS2015 AND NOT VS2017 AND NOT VS2019)
+    message(FATAL_ERROR "You must use Microsoft Visual Studio 2015 | 2017 | 2019 as compiler")
   endif()
 
   # compile with full multicore
@@ -251,6 +251,14 @@ else()
   set(HAMLIB_LIBRARIES "")
 endif()
 
+find_package(gpiod)
+if(GPIOD_FOUND)
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSE_GPIOD")
+else()
+  set(GPIOD_INCLUDE_DIRS "")
+  set(GPIOD_LIBRARIES "")
+endif()
+
 if(LINUX)
   find_package(ALSA REQUIRED)
   if(ALSA_FOUND)

cmake/modules/FindCompiler.cmake

@@ -5,7 +5,9 @@ elseif(NOT DEFINED C_GCC AND CMAKE_CXX_COMPILER_ID MATCHES "GNU")
   set(C_GCC 1)
 elseif(NOT DEFINED C_MSVC AND CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
   set(C_MSVC 1)
-  if(MSVC_VERSION GREATER 1910 AND MSVC_VERSION LESS 1919)
+  if(MSVC_VERSION GREATER 1919 AND MSVC_VERSION LESS 1926)
+    set(VS2019 ON)
+  elseif(MSVC_VERSION GREATER 1910 AND MSVC_VERSION LESS 1919)
     set(VS2017 ON)
   elseif(MSVC_VERSION GREATER 1899 AND MSVC_VERSION LESS 1910)
     set(VS2015 ON)

cmake/modules/Findgpiod.cmake

@@ -0,0 +1,23 @@
+# - Try to find libgpiod
+# Once done this will define
+#  GPIOD_FOUND - System has libgpiod
+#  GPIOD_INCLUDE_DIRS - The libgpiod include directories
+#  GPIOD_LIBRARIES - The libraries needed to use libgpiod
+#  GPIOD_DEFINITIONS - Compiler switches required for using libgpiod
+
+find_package(PkgConfig)
+pkg_check_modules(PC_GPIOD QUIET gpiod)
+
+find_path(GPIOD_INCLUDE_DIR gpiod.h)
+find_library(GPIOD_LIBRARY NAMES gpiod)
+
+include(FindPackageHandleStandardArgs)
+# handle the QUIETLY and REQUIRED arguments and set GPIOD_FOUND to TRUE
+# if all listed variables are TRUE
+find_package_handle_standard_args(gpiod  DEFAULT_MSG
+                                  GPIOD_LIBRARY GPIOD_INCLUDE_DIR)
+
+mark_as_advanced(GPIOD_INCLUDE_DIR GPIOD_LIBRARY)
+
+set(GPIOD_LIBRARIES ${GPIOD_LIBRARY})
+set(GPIOD_INCLUDE_DIRS ${GPIOD_INCLUDE_DIR})

src/CMakeLists.txt

@@ -8,6 +8,7 @@ include_directories(
   ${UDEV_INCLUDE_DIRS}
   ${PORTAUDIO_INCLUDE_DIRS}
   ${CUSTOM_GEOTRANZ_DIR}
+  ${GPIOD_INCLUDE_DIRS}
   )
 
 if(WIN32 OR CYGWIN)
@@ -127,6 +128,7 @@ target_link_libraries(direwolf
   ${ALSA_LIBRARIES}
   ${UDEV_LIBRARIES}
   ${PORTAUDIO_LIBRARIES}
+  ${GPIOD_LIBRARIES}
   )
 
 if(WIN32 OR CYGWIN)

src/audio.h

@@ -28,7 +28,8 @@
 enum ptt_method_e { 
 	PTT_METHOD_NONE,	/* VOX or no transmit. */
 	PTT_METHOD_SERIAL,	/* Serial port RTS or DTR. */
-	PTT_METHOD_GPIO,	/* General purpose I/O, Linux only. */
+	PTT_METHOD_GPIO,	/* General purpose I/O using sysfs, deprecated after 2020, Linux only. */
+	PTT_METHOD_GPIOD,	/* General purpose I/O, using libgpiod, Linux only. */
 	PTT_METHOD_LPT,	    	/* Parallel printer port, Linux only. */
 	PTT_METHOD_HAMLIB, 	/* HAMLib, Linux only. */
 	PTT_METHOD_CM108 };	/* GPIO pin of CM108/CM119/etc.  Linux only. */
@@ -266,6 +267,7 @@ struct audio_s {
 					/* the case for CubieBoard where it was longer. */
 					/* This is filled in by ptt_init so we don't have to */
 					/* recalculate it each time we access it. */
+					/* Also GPIO chip name for GPIOD method. Looks like 'gpiochip4' */
 
 					/* This could probably be collapsed into ptt_device instead of being separate. */
 

src/config.c

@@ -1743,6 +1743,43 @@ void config_init (char *fname, struct audio_s *p_audio_config,
 	      }
 	      p_audio_config->achan[channel].octrl[ot].ptt_method = PTT_METHOD_GPIO;
 #endif
+	    }
+	    else if (strcasecmp(t, "GPIOD") == 0) {
+#if __WIN32__
+	      text_color_set(DW_COLOR_ERROR);
+	      dw_printf ("Config file line %d: %s with GPIOD is only available on Linux.\n", line, otname);
+#else		
+#if defined(USE_GPIOD)
+	      t = split(NULL,0);
+	      if (t == NULL) {
+	        text_color_set(DW_COLOR_ERROR);
+	        dw_printf ("Config file line %d: Missing GPIO chip for %s.\n", line, otname);
+	        continue;
+	      }
+	      strlcpy(p_audio_config->achan[channel].octrl[ot].out_gpio_name, t, 
+	              sizeof(p_audio_config->achan[channel].octrl[ot].out_gpio_name));
+
+	      t = split(NULL,0);
+	      if (t == NULL) {
+	        text_color_set(DW_COLOR_ERROR);
+	        dw_printf("Config file line %d: Missing GPIO number for %s.\n", line, otname);
+	        continue;
+	      }
+
+	      if (*t == '-') {
+	        p_audio_config->achan[channel].octrl[ot].out_gpio_num = atoi(t+1);
+		p_audio_config->achan[channel].octrl[ot].ptt_invert = 1;
+	      }
+	      else {
+	        p_audio_config->achan[channel].octrl[ot].out_gpio_num = atoi(t);
+		p_audio_config->achan[channel].octrl[ot].ptt_invert = 0;
+	      }
+	      p_audio_config->achan[channel].octrl[ot].ptt_method = PTT_METHOD_GPIOD;
+#else
+	      text_color_set(DW_COLOR_ERROR);
+	      dw_printf ("GPIOD is not supported.\n");
+#endif /* USE_GPIOD*/
+#endif /* __WIN32__ */
 	    }
 	    else if (strcasecmp(t, "LPT") == 0) {
 

src/direwolf.c

@@ -302,6 +302,9 @@ int main (int argc, char *argv[])
 #endif
 #if defined(USE_CM108)
 	dw_printf (" cm108-ptt");
+#endif
+#if defined(USE_GPIOD)
+	dw_printf (" libgpiod");
 #endif
 	dw_printf ("\n");
 #endif

src/ptt.c

@@ -166,6 +166,10 @@
 #include "cm108.h"
 #endif
 
+#ifdef USE_GPIOD
+#include <gpiod.h>
+#endif 
+
 /* So we can have more common code for fd. */
 typedef int HANDLE;
 #define INVALID_HANDLE_VALUE (-1)
@@ -623,6 +627,31 @@ void export_gpio(int ch, int ot, int invert, int direction)
 	get_access_to_gpio (gpio_value_path);
 }
 
+#if defined(USE_GPIOD)
+int gpiod_probe(const char *chip_name, int line_number)
+{
+	struct gpiod_chip *chip;
+	chip = gpiod_chip_open_by_name(chip_name);
+	if (chip == NULL) {
+		text_color_set(DW_COLOR_ERROR);
+		dw_printf ("Can't open GPIOD chip %s.\n", chip_name);
+		return -1;
+	}
+
+	struct gpiod_line *line;
+	line = gpiod_chip_get_line(chip, line_number);
+	if (line == NULL) {
+		text_color_set(DW_COLOR_ERROR);
+		dw_printf ("Can't get GPIOD line %d.\n", line_number);
+		return -1;
+	}
+	if (ptt_debug_level >= 2) {
+		text_color_set(DW_COLOR_DEBUG);
+		dw_printf("GPIOD probe OK. Chip: %s line: %d\n", chip_name, line_number);
+	}
+	return 0;
+}
+#endif   /* USE_GPIOD */
 #endif   /* not __WIN32__ */
 
 
@@ -639,7 +668,8 @@ void export_gpio(int ch, int ot, int invert, int direction)
  *			ptt_method	Method for PTT signal. 
  *					PTT_METHOD_NONE - not configured.  Could be using VOX. 
  *					PTT_METHOD_SERIAL - serial (com) port. 
- *					PTT_METHOD_GPIO - general purpose I/O. 
+ *					PTT_METHOD_GPIO - general purpose I/O (sysfs). 
+ *					PTT_METHOD_GPIOD - general purpose I/O (libgpiod). 
  *					PTT_METHOD_LPT - Parallel printer port. 
  *                  			PTT_METHOD_HAMLIB - HAMLib rig control.
  *					PTT_METHOD_CM108 - GPIO pins of CM108 etc. USB Audio.
@@ -718,12 +748,13 @@ void ptt_init (struct audio_s *audio_config_p)
 	    if (ptt_debug_level >= 2) {
 
 	      text_color_set(DW_COLOR_DEBUG);
-              dw_printf ("ch=%d, %s method=%d, device=%s, line=%d, gpio=%d, lpt_bit=%d, invert=%d\n",
+              dw_printf ("ch=%d, %s method=%d, device=%s, line=%d, name=%s, gpio=%d, lpt_bit=%d, invert=%d\n",
 		ch,
 		otnames[ot],
 		audio_config_p->achan[ch].octrl[ot].ptt_method, 
 		audio_config_p->achan[ch].octrl[ot].ptt_device,
 		audio_config_p->achan[ch].octrl[ot].ptt_line,
+		audio_config_p->achan[ch].octrl[ot].out_gpio_name,
 		audio_config_p->achan[ch].octrl[ot].out_gpio_num,
 		audio_config_p->achan[ch].octrl[ot].ptt_lpt_bit,
 		audio_config_p->achan[ch].octrl[ot].ptt_invert);
@@ -869,7 +900,28 @@ void ptt_init (struct audio_s *audio_config_p)
 	if (using_gpio) {
 	  get_access_to_gpio ("/sys/class/gpio/export");
 	}
-
+#if defined(USE_GPIOD)
+    // GPIOD
+	for (ch = 0; ch < MAX_CHANS; ch++) {
+	  if (save_audio_config_p->achan[ch].medium == MEDIUM_RADIO) {
+	    for (int ot = 0; ot < NUM_OCTYPES; ot++) {
+	      if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_GPIOD) {
+	        const char *chip_name = audio_config_p->achan[ch].octrl[ot].out_gpio_name;
+	        int line_number = audio_config_p->achan[ch].octrl[ot].out_gpio_num;
+	        int rc = gpiod_probe(chip_name, line_number);
+	        if (rc < 0) {
+	          text_color_set(DW_COLOR_ERROR);
+	          dw_printf ("Disable PTT for channel %d\n", ch);
+	          audio_config_p->achan[ch].octrl[ot].ptt_method = PTT_METHOD_NONE;
+	        } else {
+	          // Set initial state off ptt_set will invert output signal if appropriate.
+	          ptt_set (ot, ch, 0);
+	        }
+	      }
+	    }
+	  }
+	}
+#endif /* USE_GPIOD */
 /*
  * We should now be able to create the device nodes for 
  * the pins we want to use.
@@ -1226,6 +1278,18 @@ void ptt_set (int ot, int chan, int ptt_signal)
 	  close (fd);
 
 	}
+
+#if defined(USE_GPIOD)
+	if (save_audio_config_p->achan[chan].octrl[ot].ptt_method == PTT_METHOD_GPIOD) {
+		const char *chip = save_audio_config_p->achan[chan].octrl[ot].out_gpio_name;
+		int line = save_audio_config_p->achan[chan].octrl[ot].out_gpio_num;
+		int rc = gpiod_ctxless_set_value(chip, line, ptt, false, "direwolf", NULL, NULL);
+		if (ptt_debug_level >= 1) {
+			text_color_set(DW_COLOR_DEBUG);
+			dw_printf("PTT_METHOD_GPIOD chip: %s line: %d ptt: %d  rc: %d\n", chip, line, ptt, rc);
+		}
+	}
+#endif /* USE_GPIOD */
 #endif
 
 /*