Fix linuxspi default port

If no port is specified, Avrdude will try to use the default port specified in avrdude.conf. If not present, use port specified in linuxspi.c

src/avrdude.conf.in

@@ -22,7 +22,7 @@
 #       desc     = <description> ;                  # quoted string
 #       type     = <type>;                          # programmer type, quoted string
 #                          # supported programmer types can be listed by "-c ?type"
-#       connection_type = parallel | serial | usb
+#       connection_type = parallel | serial | usb | spi
 #       baudrate = <num> ;                          # baudrate for avr910-programmer
 #       vcc      = <num1> [, <num2> ... ] ;         # pin number(s)
 #       buff     = <num1> [, <num2> ... ] ;         # pin number(s)
@@ -337,6 +337,7 @@
 #
 default_parallel   = "@DEFAULT_PAR_PORT@";
 default_serial     = "@DEFAULT_SER_PORT@";
+default_spi        = "@DEFAULT_SPI_PORT@";
 # default_bitclock = 2.5;
 
 #
@@ -1609,6 +1610,7 @@ programmer
    id = "linuxspi";
    desc = "Use Linux SPI device in /dev/spidev*";
    type = "linuxspi";
+   connection_type = spi;
    reset = 25;    # Pi GPIO number - this is J8:22
 ;
 @HAVE_LINUXSPI_END@

src/config.c

@@ -35,6 +35,7 @@
 char default_programmer[MAX_STR_CONST];
 char default_parallel[PATH_MAX];
 char default_serial[PATH_MAX];
+char default_spi[PATH_MAX];
 double default_bitclock;
 
 char string_buf[MAX_STR_CONST];

src/config_gram.y

@@ -79,6 +79,7 @@ static int pin_name;
 %token K_DEFAULT_PARALLEL
 %token K_DEFAULT_PROGRAMMER
 %token K_DEFAULT_SERIAL
+%token K_DEFAULT_SPI
 %token K_DESC
 %token K_FAMILY_ID
 %token K_DEVICECODE
@@ -115,6 +116,7 @@ static int pin_name;
 %token K_RESET
 %token K_RETRY_PULSE
 %token K_SERIAL
+%token K_SPI
 %token K_SCK
 %token K_SIGNATURE
 %token K_SIZE
@@ -254,6 +256,12 @@ def :
     free_token($3);
   } |
 
+  K_DEFAULT_SPI TKN_EQUAL TKN_STRING TKN_SEMI {
+    strncpy(default_spi, $3->value.string, PATH_MAX);
+    default_spi[PATH_MAX-1] = 0;
+    free_token($3);
+  } |
+
   K_DEFAULT_BITCLOCK TKN_EQUAL number_real TKN_SEMI {
     default_bitclock = $3->value.number_real;
     free_token($3);
@@ -507,7 +515,8 @@ prog_parm_conntype:
 prog_parm_conntype_id:
   K_PARALLEL        { current_prog->conntype = CONNTYPE_PARALLEL; } |
   K_SERIAL          { current_prog->conntype = CONNTYPE_SERIAL; } |
-  K_USB             { current_prog->conntype = CONNTYPE_USB; }
+  K_USB             { current_prog->conntype = CONNTYPE_USB; } |
+  K_SPI             { current_prog->conntype = CONNTYPE_SPI; }
 ;
 
 prog_parm_usb:

src/lexer.l

@@ -139,6 +139,7 @@ default_bitclock { yylval=NULL; return K_DEFAULT_BITCLOCK; }
 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; }
 delay            { yylval=NULL; return K_DELAY; }
 desc             { yylval=NULL; return K_DESC; }
 family_id        { yylval=NULL; return K_FAMILY_ID; }
@@ -222,6 +223,7 @@ sck              { yylval=new_token(K_SCK); return K_SCK; }
 serial           { yylval=NULL; return K_SERIAL; }
 signature        { yylval=NULL; return K_SIGNATURE; }
 size             { yylval=NULL; return K_SIZE; }
+spi              { yylval=NULL; return K_SPI; }
 spmcr            { yylval=NULL; return K_SPMCR; }
 stabdelay        { yylval=NULL; return K_STABDELAY; }
 stk500_devcode   { yylval=NULL; return K_STK500_DEVCODE; }

src/libavrdude.h

@@ -635,7 +635,8 @@ typedef enum {
 typedef enum {
   CONNTYPE_PARALLEL,
   CONNTYPE_SERIAL,
-  CONNTYPE_USB
+  CONNTYPE_USB,
+  CONNTYPE_SPI
 } conntype_t;
 
 typedef struct programmer_t {
@@ -912,6 +913,7 @@ extern LISTID       programmers;
 extern char         default_programmer[];
 extern char         default_parallel[];
 extern char         default_serial[];
+extern char         default_spi[];
 extern double       default_bitclock;
 
 /* This name is fixed, it's only here for symmetry with

src/main.c

@@ -382,6 +382,7 @@ int main(int argc, char * argv [])
 
   default_parallel[0] = 0;
   default_serial[0]   = 0;
+  default_spi[0]      = 0;
   default_bitclock    = 0.0;
 
   init_config();
@@ -921,6 +922,12 @@ int main(int argc, char * argv [])
       case CONNTYPE_USB:
         port = DEFAULT_USB;
         break;
+
+#ifdef HAVE_LINUXSPI
+      case CONNTYPE_SPI:
+        port = *default_spi ? default_spi : "unknown";
+        break;
+#endif
     }
   }