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Add optional libgpiod support to linuxgpio #1299

Merged
merged 7 commits into from
Mar 21, 2023
Merged

Add optional libgpiod support to linuxgpio #1299

merged 7 commits into from
Mar 21, 2023

Commits on Mar 16, 2023

  1. linuxgpio: rename all internal functions and variables to include "sy… 

    …sfs"

This commit renames the internal functions and variables of the linuxgpio
pin driver to include "sysfs", to indicate that they're referring to
the older sysfs interface.

The following commits will add libgpiod support to the linuxgpio pin
driver, and autoselect between them.
    @SebKuzminsky
    SebKuzminsky committed Mar 16, 2023
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  2. cmake: find & use libgpiod

    @SebKuzminsky
    SebKuzminsky committed Mar 16, 2023
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  3. linuxgpio: add optional libgpiod support 

    The "linuxgpio" backend will now try both the old sysfs and new (since
Linux 4.8) libgpiod interface to access gpio pins.  If libgpiod works
it will use that, if it does not work it will fall back to the old
sysfs interface.

The libgpiod code is compiled in if libgpiod is available at build time,
and compiled out otherwise.
    @SebKuzminsky
    SebKuzminsky committed Mar 16, 2023
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  4. gpiod: find gpio lines by port ("gpiochipN") and offset (pin number) 

    Before this commit, linuxgpio-gpiod used `gpiod_line_find()` to find
gpio lines by name, and would construct the gpio name by appending the
requested gpio number to the string "GPIO".  This had the advantage
that it didn't have to specify the gpiochip to use, since gpio names are
globally unique in gpiod-land.  But it has the severe drawback that only
gpios whose name begins with "GPIO" could be used.

This commit changes that to use `gpiod_line_get()` instead, which takes
a gpiochip name (the avrdude "port") and an "offset" (the pin number on
that chip).  This lets it use any available gpio line, no matter what
name libgpiod assigned it.
    @SebKuzminsky
    SebKuzminsky committed Mar 16, 2023
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  5. 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.
    @SebKuzminsky
    SebKuzminsky committed Mar 16, 2023
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  6. avrdude.conf: move raspberry_pi_gpio reset, add prog_modes, reformat 

    This makes the raspberry_pi_gpio programmer work on older Pis with the
smaller 26-pin GPIO header.

Updates based on code review by Hans (MCUdude).
    @SebKuzminsky
    SebKuzminsky committed Mar 16, 2023
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  7. avrdude.conf: add connection_type to example linuxgpio programmer

    @SebKuzminsky
    SebKuzminsky committed Mar 16, 2023
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