patch #10030: linuxspi: Support inverted GPIO pin

Submitted by Alex Sverdlin:
* linuxspi.c (linuxspi_open): Clear the inversion mask on request
and set default state to avoid short glitches on the GPIO line.




git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1494 81a1dc3b-b13d-400b-aceb-764788c761c2

Author: dl8dtl

ChangeLog

@@ -1,3 +1,10 @@
+2021-11-27  Joerg Wunsch <[email protected]>
+
+	Submitted by Alex Sverdlin:
+	patch #10030: linuxspi: Support inverted GPIO pin
+	* linuxspi.c (linuxspi_open): Clear the inversion mask on request
+	and set default state to avoid short glitches on the GPIO line.
+
 2021-11-27  Joerg Wunsch <[email protected]>
 
 	Submitted by Alex Sverdlin:

NEWS

@@ -120,6 +120,7 @@ Current:
     patch #10027: linuxspi: Add reset pulse, according to AVR programming algorithm
     patch #10028: linuxspi: close() only when necessary
     patch #10029: linuxspi: Report GPIO_GET_LINEHANDLE_IOCTL errors
+    patch #10030: linuxspi: Support inverted GPIO pin
 
   * Internals:
     - New avrdude.conf keyword "family_id", used to verify SIB attributes

linuxspi.c

@@ -164,7 +164,8 @@ static int linuxspi_open(PROGRAMMER *pgm, char *port)
 
     strcpy(req.consumer_label, progname);
     req.lines = 1;
-    req.lineoffsets[0] = pgm->pinno[PIN_AVR_RESET];
+    req.lineoffsets[0] = pgm->pinno[PIN_AVR_RESET] & ~PIN_INVERSE;
+    req.default_values[0] = !!(pgm->pinno[PIN_AVR_RESET] & PIN_INVERSE);
     req.flags = GPIOHANDLE_REQUEST_OUTPUT;
 
     ret = ioctl(fd_gpiochip, GPIO_GET_LINEHANDLE_IOCTL, &req);