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base-files: gpio switch: check if direction can be set

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Obviously not all GPIO controller allow to change the direction. The issue
is around since the beginning of the script but only due to the recent
changes error messages are more visible.

Add a check if a change of the direction is supported by the GPIO
controller and fallback to setting only the value if not.

Fixes: FS#1271
Signed-off-by: Mathias Kresin <dev@kresin.me>
This commit is contained in:
Mathias Kresin 2018-01-15 01:23:36 +01:00
parent f476c9a745
commit acafbac4b3
2 changed files with 10 additions and 3 deletions
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2
package/base-files/Makefile
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@ -12,7 +12,7 @@ include $(INCLUDE_DIR)/version.mk
include $(INCLUDE_DIR)/feeds.mk
PKG_NAME:=base-files
PKG_RELEASE:=183
PKG_RELEASE:=184
PKG_FLAGS:=nonshared
PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/

11
package/base-files/files/etc/init.d/gpio_switch
View File

@ -23,8 +23,15 @@ load_gpio_switch()
# we need to wait a bit until the GPIO appears
[ -d "$gpio_path" ] || sleep 1
}
# set the pin to output with high or low pin value
{ [ "$value" = "0" ] && echo "low" || echo "high"; } >"$gpio_path/direction"
# direction attribute only exists if the kernel supports changing the
# direction of a GPIO
if [ -e "${gpio_path}/direction" ]; then
# set the pin to output with high or low pin value
{ [ "$value" = "0" ] && echo "low" || echo "high"; } >"$gpio_path/direction"
else
{ [ "$value" = "0" ] && echo "0" || echo "1"; } >"$gpio_path/value"
fi
}
service_triggers()