sysfs: retain support even on older kernels #71
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The ioctl-gpio driver was declared a prerequisite of the sysfs-gpio driver. But since on older Linux kernels (earlier than 5.10) the GPIO v2 interface is not yet available. Therefore, the ioctl-gpio driver is not available for such systems. To still support the sysfs access for those make the ioctl-gpio driver independent of the sysfs-gpio driver. Note: the ioctl-gpio driver is still attempted to load.
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## main #71 +/- ##
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- Coverage 27.2% 27.2% -0.0%
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Files 96 96
Lines 11834 11838 +4
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- Misses 8479 8483 +4
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kaespi
commented
Sep 9, 2025
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| func (d *driverGPIO) Prerequisites() []string { | ||
| return []string{"ioctl-gpio"} | ||
| return nil |
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If there's really some dependency on ioctl-gpio we could move it to the After() below...!?
kaespi
referenced
this pull request
Sep 9, 2025
Includes new unit test that are conditionally compiled on linux. Mock in case of no chip available.
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The ioctl-gpio driver was declared a prerequisite of the sysfs-gpio driver. But since on older Linux kernels (earlier than 5.10) the GPIO v2 interface is not yet available. Therefore, the ioctl-gpio driver is not available for such systems. To still support the sysfs access for those make the ioctl-gpio driver independent of the sysfs-gpio driver.
Note: the ioctl-gpio driver is still attempted to load.
This renders #39 (implemented in #59) a bit more backwards compatabile.
Background: we're using periph.io on our embedded Linux with kernel 5.4.193. It was all working fine until we recently upgraded the
hostpackage from 3.8.2 to 3.8.5. Suddenly nothing was working anymore. We noticed the error is in the initialization of the ioctl-gpio driver which uses the GPIO v2 interface, which is not yet available on our kernel. Since we only use the sysfs-gpio driver we removed the dependency on ioctl-gpio and all was working fine again. Therefore, I guess more people would want to have backwards compatibility (in particular since the change was introduced in 3.8.2 -> 3.8.3 which is supposed to be non-breaking, I guess).