Replace wiringpi with lgpio

Author: aschamberger

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.20.3 as builder
+FROM alpine:3.20.3 AS builder
 
 #ARG ALSAEQUAL_VERSION=master
 # use older commit to be compatible with version from raspberry pi OS
@@ -22,7 +22,7 @@ RUN cd /usr/local/src \
     && make install
 
 RUN apk update \
-    && apk add --no-cache wget unzip autoconf automake wiringpi wiringpi-dev flac-dev faad2-dev mpg123-dev libvorbis-dev libmad-dev soxr-dev openssl-dev opusfile-dev opus-dev libogg-dev libtool
+    && apk add --no-cache wget unzip autoconf automake flac-dev faad2-dev mpg123-dev libvorbis-dev libmad-dev soxr-dev openssl-dev opusfile-dev opus-dev libogg-dev libtool
 
 RUN cd /usr/local/src \
     && mkdir dest \
@@ -55,15 +55,22 @@ RUN cd /usr/local/src \
     && cd .. \
     && cd squeezelite-$SQUEEZELITE_VERSION \
     && patch -p1 -i alpine/load-libtremor-first.patch \
-    && make OPTS="-DRESAMPLE -DDSD -DGPIO -DVISEXPORT -DUSE_SSL -DNO_SSLSYM -DOPUS -DALAC -DLINE_IN -I/usr/include/opus -I/usr/include/alac" \
+    && make OPTS="-DRESAMPLE -DDSD -DGPIO -DVISEXPORT -DUSE_SSL -DOPUS -DALAC -DLINE_IN -I/usr/include/opus -I/usr/include/alac" \
     && gcc -Os -fomit-frame-pointer -fcommon -s -o find_servers tools/find_servers.c \
     && gcc -Os -fomit-frame-pointer -fcommon -s -o alsacap tools/alsacap.c -lasound 
 
+RUN cd /usr/local/src \
+    && wget https://github.com/joan2937/lg/archive/master.zip -O lgpio.zip \
+    && unzip lgpio.zip \
+    && cd lg-master \
+    && make \
+    && make DESTDIR="/usr/local/src/dest" install
+
 COPY gpio.c /usr/local/src/gpio.c
 
 RUN cd /usr/local/src \
-    && gcc -o gpio gpio.c -Wall -Wextra -Winline -I/usr/include -L/usr/lib -pipe -lwiringPi
-    
+    && gcc -O3 -Wall -pthread -o gpio gpio.c -I/usr/local/src/lg-master -L/usr/local/src/lg-master -llgpio
+
 FROM alpine:3.20.3
 
 ENV LANG C.UTF-8
@@ -89,7 +96,6 @@ COPY --from=builder /usr/local/src/dest/usr/lib/* /usr/lib/
 COPY --from=builder /usr/local/src/squeezelite-*/squeezelite /usr/local/bin/squeezelite
 #COPY --from=builder /usr/local/src/squeezelite-*/alsacap /usr/local/bin/alsacap
 #COPY --from=builder /usr/local/src/squeezelite-*/find_servers /usr/local/bin/find_servers
-COPY --from=builder /usr/lib/libwiringPi.so* /usr/lib/
 COPY --from=builder /usr/local/src/gpio /usr/local/bin/gpio
 COPY --from=builder /usr/lib/alsa-lib/libasound_module_pcm_equal.so /usr/lib/alsa-lib/libasound_module_pcm_equal.so
 COPY --from=builder /usr/lib/alsa-lib/libasound_module_ctl_equal.so /usr/lib/alsa-lib/libasound_module_ctl_equal.so

README.md

@@ -56,7 +56,7 @@ The speaker switcher GPIO is used to trigger an external 5V relais changing spea
 Additionally an external switch can be controlled via home assistant.
 
 The [power_mute.sh](power_mute.sh) script is automatically configured via the `-S` squeezelite parameter when one of the relevant ENV vars is present in the docker run command. 
-It uses a custom [gpio control binary](gpio.c) based on [WiringPi](https://github.com/WiringPi/WiringPi).
+It uses a custom [gpio control binary](gpio.c) based on [lgpio](https://github.com/joan2937/lg).
 
 [flock](https://linux.die.net/man/1/flock) is used to prevent race conditions of parallel running scripts for different player instances.
 

gpio.c

@@ -2,60 +2,106 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <strings.h>
-#include <wiringPi.h>
+#include <lgpio.h>
+
+#define LFLAGS 0
 
 /*
- * gcc -o gpio gpio.c -Wall -Wextra -Winline -I/usr/include -L/usr/lib -pipe -lwiringPi
+ * gcc -O3 -Wall -pthread -o gpio gpio.c -I/usr/local/src/lg-master -L/usr/local/src/lg-master -llgpio
  */
 
 int main(int argc, char **argv)
 {
+    int h;
+    int pin, mode, state;
+
+    static int board_map[41] =
+    {
+        -1,     // 0
+        -1, -1, // 1, 2
+         2, -1, // 3, 4
+         3, -1, // ...
+         4, 14,
+        -1, 15,
+        17, 18,
+        27, -1,
+        22, 23,
+        -1, 24,
+        10, -1,
+         9, 25,
+        11,  8,
+        -1,  7,
+         0,  1,
+         5, -1,
+         6, 12,
+        13, -1,
+        19, 16,
+        26, 20,
+        -1, 21,
+    };
+
+    h = lgGpiochipOpen(0);
 
-    wiringPiSetupPhys ();
+    if (h < 0)
+    {
+        printf("Could not open GPIO!\n");
+        exit(1);
+    }
 
     if (argc > 1)
     {
         // INPUT 0, OUTPUT 1,
         if (strcasecmp (argv [1], "set_mode") == 0)
         {
-            int pin = atoi(argv[2]);
-            int mode = atoi(argv [3]);
-            pinMode (pin, mode);
-            pullUpDnControl (pin, PUD_OFF);
+            pin = atoi(argv[2]);
+            mode = atoi(argv[3]);
+            if (mode == 1)
+            {
+                state = lgGpioRead(h, board_map[pin]);
+                lgGpioClaimOutput(h, LFLAGS, board_map[pin], state);
+            }
+            else if (mode == 0)
+            {
+                lgGpioClaimInput(h, LFLAGS, board_map[pin]);
+            }
         }
         // INPUT 0, OUTPUT 1,
         else if (strcasecmp(argv[1], "get_mode") == 0)
         {
-            int pin = atoi(argv [2]);
-            int val = getAlt(pin);
-            printf("%s", val == 0 ? "0" : "1");
+            pin = atoi(argv[2]);
+            mode = lgGpioGetMode(h, board_map[pin]);
+            printf("%s", mode & 0x2 ? "1" : "0");
         }
         // LOW 0, HIGH 1
         else if (strcasecmp(argv[1], "read") == 0)
         {
-            int pin = atoi(argv[2]);
-            int val = digitalRead(pin);
-            printf("%s", val == 0 ? "0" : "1");
+            pin = atoi(argv[2]);
+            state = lgGpioRead(h, board_map[pin]);
+            printf("%s", state == 0 ? "0" : "1");
         }
         // LOW 0, HIGH 1
         else if (strcasecmp(argv[1], "write") == 0)
         {
-            int pin = atoi(argv[2]);
-            int state = atoi(argv[3]);
-            digitalWrite(pin, state);
+            pin = atoi(argv[2]);
+            state = atoi(argv[3]);
+            lgGpioWrite(h, board_map[pin], state);
         }
         else
         {
             printf("Unknown command!\n");
+            lgGpiochipClose(h);
             exit(1);
         }
     }
     else
     {
         printf("Unknown command!\n");
+        lgGpiochipClose(h);
         exit(1);
     }
 
+    lgGpiochipClose(h);
+
     return 0;
 
 }