add a new conntype for linuxgpio

This also adds a default linuxgpio port ("gpiochip0"), and adds a
programmer to the avrdude.conf file using linuxgpio from the Raspberry
Pi GPIO port.

src/CMakeLists.txt

@@ -87,18 +87,23 @@ endif()
 if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
     set(DEFAULT_PAR_PORT "/dev/parport0")
     set(DEFAULT_SER_PORT "/dev/ttyS0")
+    set(DEFAULT_LINUXGPIO_PORT "gpiochip0")
 elseif (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
     set(DEFAULT_PAR_PORT "/dev/ppi0")
     set(DEFAULT_SER_PORT "/dev/cuad0")
+    set(DEFAULT_LINUXGPIO_PORT "unknown")
 elseif (CMAKE_SYSTEM_NAME STREQUAL "Solaris")
     set(DEFAULT_PAR_PORT "/dev/printers/0")
     set(DEFAULT_SER_PORT "/dev/term/a")
+    set(DEFAULT_LINUXGPIO_PORT "unknown")
 elseif (CMAKE_SYSTEM_NAME STREQUAL "Windows")
     set(DEFAULT_PAR_PORT "lpt1")
     set(DEFAULT_SER_PORT "com1")
+    set(DEFAULT_LINUXGPIO_PORT "unknown")
 else()
     set(DEFAULT_PAR_PORT "unknown")
     set(DEFAULT_SER_PORT "unknown")
+    set(DEFAULT_LINUXGPIO_PORT "unknown")
 endif()
 
 # =====================================
@@ -120,6 +125,7 @@ add_custom_command(
         -D HAVE_LINUXGPIO=$<BOOL:${HAVE_LINUXGPIO}>
         -D DEFAULT_PAR_PORT=${DEFAULT_PAR_PORT}
         -D DEFAULT_SER_PORT=${DEFAULT_SER_PORT}
+        -D DEFAULT_LINUXGPIO_PORT=${DEFAULT_LINUXGPIO_PORT}
         -P "${CMAKE_CURRENT_SOURCE_DIR}/configure.cmake"
     DEPENDS avrdude.conf.in
     VERBATIM

src/avrdude.conf.in

@@ -411,6 +411,7 @@ default_parallel   = "@DEFAULT_PAR_PORT@";
 default_serial     = "@DEFAULT_SER_PORT@";
 default_spi        = "@DEFAULT_SPI_PORT@";
 # default_bitclock = 2.5;
+default_linuxgpio  = "@DEFAULT_LINUXGPIO_PORT@";
 
 @HAVE_PARPORT_BEGIN@
 
@@ -691,7 +692,7 @@ programmer
 
 @HAVE_LINUXGPIO_BEGIN@
 
-# This programmer bitbangs GPIO lines using the Linux sysfs GPIO interface
+# This programmer bitbangs GPIO lines using the Linux libgpiod or sysfs GPIO interface
 #
 # To enable it set the configuration below to match the GPIO lines connected
 # to the relevant ISP header pins and uncomment the entry definition. In case
@@ -719,6 +720,21 @@ programmer
 #     sdo                  = ?;
 #     sdi                  = ?;
 # ;
+
+# #------------------------------------------------------------
+# # Program from a Raspberry Pi GPIO port using linuxgpio
+# #------------------------------------------------------------
+#
+programmer
+    id = "raspberry_pi_gpio";
+    desc = "Bitbang Raspberry Pi GPIO via linuxgpio (sysfs or libgpiod)";
+    type = "linuxgpio";
+    connection_type = linuxgpio;
+    reset = 12;
+    sck = 24;
+    sdo = 23;
+    sdi = 18;
+;
 @HAVE_LINUXGPIO_END@
 
 @HAVE_LINUXSPI_BEGIN@

src/config.c

@@ -40,6 +40,7 @@ const char *default_parallel;
 const char *default_serial;
 const char *default_spi;
 double default_bitclock;
+char const *default_linuxgpio;
 
 LISTID       string_list;
 LISTID       number_list;

src/config_gram.y

@@ -81,6 +81,7 @@ static int pin_name;
 %token K_DEFAULT_PROGRAMMER
 %token K_DEFAULT_SERIAL
 %token K_DEFAULT_SPI
+%token K_DEFAULT_LINUXGPIO
 %token K_HVUPDI_SUPPORT
 %token K_DEVICECODE
 %token K_EEPROM
@@ -88,6 +89,7 @@ static int pin_name;
 %token K_FLASH
 %token K_ID
 %token K_IO
+%token K_LINUXGPIO
 %token K_LOADPAGE
 %token K_SDI
 %token K_SDO
@@ -228,6 +230,11 @@ def :
   K_DEFAULT_BITCLOCK TKN_EQUAL number_real TKN_SEMI {
     default_bitclock = $3->value.number_real;
     free_token($3);
+  } |
+
+  K_DEFAULT_LINUXGPIO TKN_EQUAL TKN_STRING TKN_SEMI {
+    default_linuxgpio = cache_string($3->value.string);
+    free_token($3);
   }
 ;
 
@@ -450,6 +457,7 @@ prog_parm_conntype:
 ;
 
 prog_parm_conntype_id:
+  K_LINUXGPIO       { current_prog->conntype = CONNTYPE_LINUXGPIO; } |
   K_PARALLEL        { current_prog->conntype = CONNTYPE_PARALLEL; } |
   K_SERIAL          { current_prog->conntype = CONNTYPE_SERIAL; } |
   K_USB             { current_prog->conntype = CONNTYPE_USB; } |

src/configure.ac

@@ -364,30 +364,37 @@ case $target in
 	i[[3456]]86-*-linux*|x86_64-*-linux*)
 		DEFAULT_PAR_PORT="/dev/parport0"
 		DEFAULT_SER_PORT="/dev/ttyS0"
+		DEFAULT_LINUXGPIO_PORT="gpiochip0"
 		;;
 	*-*-linux*)
 		DEFAULT_PAR_PORT="unknown"
 		DEFAULT_SER_PORT="/dev/ttyS0"
+		DEFAULT_LINUXGPIO_PORT="gpiochip0"
 		;;
 	i[[3456]]86-*-*freebsd*|amd64-*-*freebsd*)
 		DEFAULT_PAR_PORT="/dev/ppi0"
 		DEFAULT_SER_PORT="/dev/cuad0"
+		DEFAULT_LINUXGPIO_PORT="unknown"
 		;;
 	*-*-*freebsd*)
 		DEFAULT_PAR_PORT="unknown"
 		DEFAULT_SER_PORT="/dev/cuad0"
+		DEFAULT_LINUXGPIO_PORT="unknown"
 		;;
 	*-*-solaris*)
 		DEFAULT_PAR_PORT="/dev/printers/0"
 		DEFAULT_SER_PORT="/dev/term/a"
+		DEFAULT_LINUXGPIO_PORT="unknown"
 		;;
 	*-*-msdos* | *-*-mingw32* | *-*-cygwin* | *-*-windows*)
 		DEFAULT_PAR_PORT="lpt1"
 		DEFAULT_SER_PORT="com1"
+		DEFAULT_LINUXGPIO_PORT="unknown"
 		;;
 	*)
 		DEFAULT_PAR_PORT="unknown"
 		DEFAULT_SER_PORT="unknown"
+		DEFAULT_LINUXGPIO_PORT="unknown"
 		;;
 esac
 
@@ -414,6 +421,17 @@ else
 fi
 
 
+if test "$enabled_linuxgpio" = "yes"; then
+	AC_MSG_CHECKING([for default linuxgpio port])
+	if test "$DEFAULT_LINUXGPIO_PORT" = "unknown"; then
+		AC_MSG_NOTICE([linuxgpio port access disabled for this system])
+		enabled_linuxgpio=no
+	else
+		AC_MSG_RESULT([$DEFAULT_LINUXGPIO_PORT])
+	fi
+	AC_SUBST(DEFAULT_LINUXGPIO_PORT, $DEFAULT_LINUXGPIO_PORT)
+fi
+
 if test "$enabled_linuxgpio" = "yes"; then
 	AC_DEFINE(HAVE_LINUXGPIO, 1, [Linux sysfs GPIO support enabled])
 	confsubst="$confsubst -e /^@HAVE_LINUXGPIO_/d"

src/developer_opts.c

@@ -835,6 +835,7 @@ void dev_output_pgm_part(int dev_opt_c, const char *programmer, int dev_opt_p, c
     dev_info("default_parallel   = %s;\n", p = cfg_escape(default_parallel)); free(p);
     dev_info("default_serial     = %s;\n", p = cfg_escape(default_serial)); free(p);
     dev_info("default_spi        = %s;\n", p = cfg_escape(default_spi)); free(p);
+    dev_info("default_linuxgpio  = %s;\n", p = cfg_escape(default_linuxgpio)); free(p);
 
     dev_info("\n#\n# PROGRAMMER DEFINITIONS\n#\n\n");
   }
@@ -1203,6 +1204,7 @@ static void dev_pgm_raw(const PROGRAMMER *pgm) {
 
 static const char *connstr(conntype_t conntype) {
   switch(conntype) {
+  case CONNTYPE_LINUXGPIO: return "linuxgpio";
   case CONNTYPE_PARALLEL: return "parallel";
   case CONNTYPE_SERIAL: return "serial";
   case CONNTYPE_USB: return "usb";

src/doc/avrdude.texi

@@ -1934,6 +1934,11 @@ Assign the default parallel port device.  Can be overridden using the
 Assign the default serial port device.  Can be overridden using the
 @option{-P} option.
 
+@item default_linuxgpio = "@var{default-linuxgpio-device}";
+Assign the default gpiochip for linuxgpio's libgpiod mode,
+e.g. "gpiochip0".  Ignored for linuxgpio's sysfs mode.  Can be overridden
+using the @option{-P} option.
+
 @item default_programmer = "@var{default-programmer-id}";
 Assign the default programmer id.  Can be overridden using the @option{-c}
 option.

src/lexer.l

@@ -162,6 +162,7 @@ default_parallel { yylval=NULL; return K_DEFAULT_PARALLEL; }
 default_programmer { yylval=NULL; return K_DEFAULT_PROGRAMMER; }
 default_serial   { yylval=NULL; return K_DEFAULT_SERIAL; }
 default_spi      { yylval=NULL; return K_DEFAULT_SPI; }
+default_linuxgpio { yylval=NULL; return K_DEFAULT_LINUXGPIO; }
 devicecode       { yylval=NULL; ccap(); return K_DEVICECODE; }
 eeprom           { yylval=NULL; return K_EEPROM; }
 eeprom_instr     { yylval=NULL; ccap(); return K_EEPROM_INSTR; }
@@ -180,6 +181,7 @@ id               { yylval=NULL; ccap(); return K_ID; }
 io               { yylval=new_token(K_IO); return K_IO; }
 is_at90s1200     { yylval=NULL; ccap(); return K_IS_AT90S1200; }
 is_avr32         { yylval=NULL; ccap(); return K_IS_AVR32; }
+linuxgpio        { yylval=NULL; ccap(); return K_LINUXGPIO; }
 load_ext_addr    { yylval=new_token(K_LOAD_EXT_ADDR); ccap(); return K_LOAD_EXT_ADDR; }
 loadpage_hi      { yylval=new_token(K_LOADPAGE_HI); ccap(); return K_LOADPAGE_HI; }
 loadpage_lo      { yylval=new_token(K_LOADPAGE_LO); ccap(); return K_LOADPAGE_LO; }

src/libavrdude.h

@@ -722,7 +722,8 @@ typedef enum {
   CONNTYPE_PARALLEL,
   CONNTYPE_SERIAL,
   CONNTYPE_USB,
-  CONNTYPE_SPI
+  CONNTYPE_SPI,
+  CONNTYPE_LINUXGPIO
 } conntype_t;
 
 /*
@@ -1112,6 +1113,7 @@ extern const char *default_parallel;
 extern const char *default_serial;
 extern const char *default_spi;
 extern double       default_bitclock;
+extern char const * default_linuxgpio;
 
 /* This name is fixed, it's only here for symmetry with
  * default_parallel and default_serial. */

src/main.c

@@ -540,6 +540,7 @@ int main(int argc, char * argv [])
   default_serial     = "";
   default_spi        = "";
   default_bitclock   = 0.0;
+  default_linuxgpio  = "";
 
   init_config();
 
@@ -1087,6 +1088,11 @@ int main(int argc, char * argv [])
         port = cfg_strdup("main()", *default_spi? default_spi: "unknown");
 #endif
         break;
+
+      case CONNTYPE_LINUXGPIO:
+        port = cfg_strdup("main()", default_linuxgpio);
+        break;
+
     }
   }