Inital Commit

RemarkableLamyEraser.pro

@@ -0,0 +1,15 @@
+TEMPLATE = app
+CONFIG += console
+CONFIG -= app_bundle
+CONFIG -= qt
+
+INCLUDEPATH += /opt/codex/rm11x/2.5.2/sysroots/x86_64-codexsdk-linux/usr/lib/arm-remarkable-linux-gnueabi/gcc/arm-remarkable-linux-gnueabi/7.3.0/include
+
+SOURCES += \
+        main.c
+
+target.path = /home/root
+INSTALLS += target
+
+DISTFILES += \
+    RemarkableLamyEraser/LamyEraser.service

RemarkableLamyEraser/LamyEraser.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Lamy Pen Button as Eraser
+After=home.mount
+
+[Service]
+ExecStart=/home/root/RemarkableLamyEraser/RemarkableLamyEraser
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target

main.c

@@ -0,0 +1,99 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <string.h>
+#include <fcntl.h>
+#include <linux/input.h>
+
+#define PEN_DEVICE      "/dev/input/event1"
+
+//const struct input_event tool_touch_off = { .type = EV_KEY, .code = BTN_TOUCH, .value = 0}; //these might be used in the future to improve press and hold mode
+//const struct input_event tool_pen_on = { .type = EV_KEY, .code = BTN_TOOL_PEN, .value = 1}; //used when pen approaches the screen
+//const struct input_event tool_pen_off = { .type = EV_KEY, .code = BTN_TOOL_PEN, .value = 0};
+const struct input_event tool_rubber_on = { .type = EV_KEY, .code = BTN_TOOL_RUBBER, .value = 1}; //used when rubber approaches the screen
+const struct input_event tool_rubber_off = { .type = EV_KEY, .code = BTN_TOOL_RUBBER, .value = 0};
+
+
+void writeEvent(int fd, struct input_event event)
+{
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  event.time = tv;
+  //debug: printf("writing: seconds = %ld, usec= %ld, type = %d, code = %d, value = %d\n", event.time.tv_sec, event.time.tv_usec, event.type, event.code, event.value);
+  write(fd, &event, sizeof(struct input_event));
+}
+
+int main(int argc, char *argv[]) {
+    struct input_event ev_pen;
+    int fd_pen;
+    bool toggleMode = false;
+    bool toggle = 0;
+    char name[256] = "Unknown";
+
+    if (argc > 2) {
+        printf("Too many arguments supplied.");
+        return EXIT_FAILURE;
+      }
+    else if (argc == 2) {
+        if (!strncmp(argv[1], "--toggle", 8)) {
+        printf("MODE: TOGGLE\n");
+        toggleMode = true;
+        }
+      }
+    else {
+      printf("MODE: PRESS AND HOLD\n");
+      toggleMode = false;
+      }
+
+    if ((getuid()) != 0) {
+        fprintf(stderr, "You are not root! This may not work...\n");
+        return EXIT_SUCCESS;
+    }
+
+    /* Open Device */
+    fd_pen = open(PEN_DEVICE, O_RDWR);
+    if (fd_pen == -1) {
+        fprintf(stderr, "%s is not a vaild device\n", PEN_DEVICE);
+        return EXIT_FAILURE;
+      }
+
+
+    /* Print Device Name */
+    ioctl(fd_pen, EVIOCGNAME(sizeof(name)), name);
+    printf("Reading from:\n");
+    printf("device file = %s\n", PEN_DEVICE);
+    printf("device name = %s\n", name);
+
+
+    for (;;) {
+        const size_t ev_pen_size = sizeof(struct input_event);
+        read(fd_pen, &ev_pen, ev_pen_size);
+
+        if (toggleMode) { //toggle mode
+            if (ev_pen.code == BTN_STYLUS && ev_pen.value == 1) {
+                toggle = !toggle;
+                printf("toggle: %d\n", toggle);
+              }
+            if (toggle)
+              if (ev_pen.code == BTN_TOOL_PEN) {
+                  if (ev_pen.value == 1) {
+                    printf("writing eraser on");
+                    writeEvent(fd_pen, tool_rubber_on);
+                    }
+                  else {
+                      printf("writing eraser off");
+                      writeEvent(fd_pen, tool_rubber_off);
+                  }
+            }
+          }
+        else //press and hold mode
+          {
+            if (ev_pen.code == BTN_STYLUS) {
+                ev_pen.code = BTN_TOOL_RUBBER; //value will follow the button, so we can reuse the message
+                writeEvent(fd_pen, ev_pen);
+              }
+          }
+      }
+    return EXIT_SUCCESS;
+}