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adapter/parport: Add device file support

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Allow to specify the parallel port by its device file. Deprecate port
number support but keep it for backward compatibility.

This is one necessary step to remove direct I/O support for the parallel
port driver.

While at it, consistently return ERROR_JTAG_INIT_FAILED in case of a
failure in parport_init().

Change-Id: Ie68087f05ece4b32ccab9d9bdfbf7e1a779e9031
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/9152
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins
This commit is contained in:
Marc Schink
2025-08-17 17:09:12 +00:00
committed by Antonio Borneo
parent 39ed0b0bba
commit 910e6ba2f0
2 changed files with 73 additions and 29 deletions
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9
doc/openocd.texi
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@@ -3217,11 +3217,12 @@ The pin direction is given in the following table.
@tab 2
@end multitable
@deffn {Config Command} {parport port} port_number
Configure the number of the parallel port.
@deffn {Config Command} {parport port} file
Specify the device file of the parallel port device.
The parallel port device file is usually @file{/dev/parportX} on Linux and @file{/dev/ppiX} on FreeBSD.
When using PPDEV to access the parallel port, use the number of the parallel port file @file{/dev/parport} (Linux) or @file{/dev/ppi} (FreeBSD).
The default port number is 0.
For legacy reason, the port number @var{X} can be specified instead of the device file.
@b{Note:} Using the port number is a deprecated feature and will be removed in the future.
When using direct I/O, the number is the I/O port number.
The default port number is 0x378 (LTP1).