base-files: gpio switch: add named GPIO support
authorKuan-Yi Li <kyli@abysm.org>
Sat, 10 Aug 2019 19:23:28 +0000 (03:23 +0800)
committerJo-Philipp Wich <jo@mein.io>
Thu, 18 Jun 2020 18:08:18 +0000 (20:08 +0200)
Previously, gpio_switch only accepts GPIO pin number as input. Once a
GPIO pin is exported and named by device tree, its pin state cannot be
configured and saved across reboots by UCI.

This patch adds support for named GPIO pins. Thus GPIO pin can be
exported by device tree with active high/low correctly configured,
having human-readable name in /sys/class/gpio/ is also now possible.

More importantly, GPIO pins which are referenced by name will be immune
from pin mapping breakage while unintentional pin number changes are
introduced by kernel or driver updates.

Signed-off-by: Kuan-Yi Li <kyli@abysm.org>
package/base-files/Makefile
package/base-files/files/etc/init.d/gpio_switch
package/base-files/files/lib/functions/uci-defaults.sh

index 5bf783d..84fbcac 100644 (file)
@@ -12,7 +12,7 @@ include $(INCLUDE_DIR)/version.mk
 include $(INCLUDE_DIR)/feeds.mk
 
 PKG_NAME:=base-files
-PKG_RELEASE:=222
+PKG_RELEASE:=223
 PKG_FLAGS:=nonshared
 
 PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/
index 6b2dcdc..24d790b 100755 (executable)
@@ -16,21 +16,39 @@ load_gpio_switch()
        config_get name "$1" name
        config_get value "$1" value 0
 
-       local gpio_path="/sys/class/gpio/gpio${gpio_pin}"
-       # export GPIO pin for access
-       [ -d "$gpio_path" ] || {
-               echo "$gpio_pin" >/sys/class/gpio/export
-               # we need to wait a bit until the GPIO appears
-               [ -d "$gpio_path" ] || sleep 1
+       [ -z "$gpio_pin" ] && {
+               echo >&2 "Skipping gpio_switch '$name' due to missing gpio_pin"
+               return 1
        }
 
-       # 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"; } >"$gpio_path/direction"
+       local gpio_path
+       if [ -n "$(echo "$gpio_pin" | grep -E "^[0-9]+$")" ]; then
+               gpio_path="/sys/class/gpio/gpio${gpio_pin}"
+
+               # export GPIO pin for access
+               [ -d "$gpio_path" ] || {
+                       echo "$gpio_pin" >/sys/class/gpio/export
+                       # we need to wait a bit until the GPIO appears
+                       [ -d "$gpio_path" ] || sleep 1
+               }
+
+               # 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"; } \
+                               >"$gpio_path/value"
+               fi
        else
-               { [ "$value" = "0" ] && echo "0" || echo "1"; } >"$gpio_path/value"
+               gpio_path="/sys/class/gpio/${gpio_pin}"
+
+               [ -d "$gpio_path" ] && {
+                       { [ "$value" = "0" ] && echo "0" || echo "1"; } \
+                               >"$gpio_path/value"
+               }
        fi
 }
 
index e551e8f..12b9000 100755 (executable)
@@ -573,7 +573,7 @@ ucidef_add_gpio_switch() {
        json_select_object gpioswitch
                json_select_object "$cfg"
                        json_add_string name "$name"
-                       json_add_int pin "$pin"
+                       json_add_string pin "$pin"
                        json_add_int default "$default"
                json_select ..
        json_select ..