A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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gpio/mockup: add virtual gpio device

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This patch add basic structure of a virtual gpio device(gpio-mockup)
for testing gpio subsystem. The tester could manipulate such device
through userspace(sysfs or char device) and check the result from
debugfs.

Currently, it support one or more gpiochip(determined by module
parameters with base,ngpio pair). One could test the overlap of
different gpiochip and test the direction and/or output values of
these chips.

Signed-off-by: Kamlakant Patel <[email protected]>
Signed-off-by: Bamvor Jian Zhang <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
This commit is contained in:
Bamvor Jian Zhang 2016-08-31 11:45:46 +02:00 • committed by Linus Walleij
commit 0f98dd1b27
4 changed files with 231 additions and 0 deletions
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4
Documentation/kernel-parameters.txt
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@ -1364,6 +1364,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Format: <unsigned int> such that (rxsize & ~0x1fffc0) == 0.
Default: 1024
gpio-mockup.gpio_mockup_ranges
[HW] Sets the ranges of gpiochip of for this device.
Format: <start1>,<end1>,<start2>,<end2>...
hardlockup_all_cpu_backtrace=
[KNL] Should the hard-lockup detector generate
backtraces on all cpus.