From 6d0f39438e49357f52b3f687adc709a8c21238dc Mon Sep 17 00:00:00 2001
From: Nathan Lebrun <gaz.honsepaskwa@gmail.com>
Date: Fri, 11 Jul 2025 18:41:35 +0200
Subject: [PATCH] elan touchpad module (not by me)

---
 elan-touchpad-manager.c | 154 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 elan-touchpad-manager.c

diff --git a/elan-touchpad-manager.c b/elan-touchpad-manager.c
new file mode 100644
index 0000000..6cd4b4a
--- /dev/null
+++ b/elan-touchpad-manager.c
@@ -0,0 +1,154 @@
+#include <dirent.h>
+#include <fcntl.h>
+#include <linux/input.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/epoll.h>
+#include <time.h>
+#include <unistd.h>
+#define TOUCHPAD_NAME "ELAN1206"
+#define MAX_PATH_LEN 256
+#define MAX_LINE_LEN 256
+
+int find_touchpad_event() {
+  DIR *dir;
+  struct dirent *entry;
+  char device_path[MAX_PATH_LEN];
+  int event_num;
+
+  dir = opendir("/sys/class/input");
+  if (dir == NULL) {
+    perror("Error opening /sys/class/input directory");
+    return -1;
+  }
+
+  while ((entry = readdir(dir)) != NULL) {
+    if (strncmp(entry->d_name, "event", 5) == 0) {
+      snprintf(device_path, MAX_PATH_LEN, "/sys/class/input/%s/device/name",
+               entry->d_name);
+
+      if (access(device_path, F_OK) != -1) {
+        FILE *device_file = fopen(device_path, "r");
+        if (device_file != NULL) {
+          char name_content[MAX_LINE_LEN];
+
+          if (fgets(name_content, MAX_LINE_LEN, device_file) != NULL) {
+            size_t len = strlen(name_content);
+            if (len > 0 && name_content[len - 1] == '\n') {
+              name_content[len - 1] = '\0';
+            }
+
+            if (strstr(name_content, TOUCHPAD_NAME) != NULL &&
+                strstr(name_content, "Touchpad") != NULL) {
+
+              sscanf(entry->d_name, "event%d", &event_num);
+
+              fclose(device_file);
+              break;
+            }
+          }
+          fclose(device_file);
+        }
+      }
+    }
+  }
+
+  closedir(dir);
+  return event_num;
+}
+int stop_touch_pad() {
+  FILE *fp = fopen("/sys/bus/platform/drivers/idma64/unbind", "w");
+  if (fp == NULL) {
+    perror("Failed to open file");
+    return 1;
+  }
+
+  if (fprintf(fp, "idma64.1") < 0) {
+    perror("Failed to write to file");
+    fclose(fp);
+    return 1;
+  }
+
+  fclose(fp);
+  return 0;
+}
+int start_touch_pad() {
+  FILE *fp = fopen("/sys/bus/platform/drivers/idma64/bind", "w");
+  if (fp == NULL) {
+    perror("Failed to open file");
+    return 1;
+  }
+
+  if (fprintf(fp, "idma64.1") < 0) {
+    perror("Failed to write to file");
+    fclose(fp);
+    return 1;
+  }
+
+  fclose(fp);
+  return 0;
+}
+int main() {
+  int touchpad_event = find_touchpad_event();
+  char touchpad_event_path[MAX_PATH_LEN];
+  if (touchpad_event != -1) {
+    snprintf(touchpad_event_path, MAX_PATH_LEN, "/dev/input/event%d",
+             touchpad_event);
+    int fd = open(touchpad_event_path, O_RDONLY | O_NONBLOCK);
+    if (fd < 0) {
+      perror("Failed to open device");
+      return 1;
+    }
+    int epfd = epoll_create1(0);
+    if (epfd < 0) {
+      perror("epoll_create1 failed");
+      close(fd);
+      return 1;
+    }
+    struct epoll_event ev;
+    ev.events = EPOLLIN;
+    ev.data.fd = fd;
+    if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev) < 0) {
+      perror("epoll_ctl failed");
+      close(epfd);
+      close(fd);
+      return 1;
+    }
+
+    struct input_event event;
+    time_t last_event_time = time(NULL);
+    int is_sleeping = 0;
+
+    while (1) {
+      struct epoll_event events[1];
+      int nfds = epoll_wait(epfd, events, 1, 1000);
+
+      time_t current_time = time(NULL);
+
+      if (!is_sleeping && difftime(current_time, last_event_time) >= 1.0 &&
+          nfds == 0) {
+        is_sleeping = 1;
+        stop_touch_pad();
+      }
+
+      if (nfds > 0) {
+        if (read(fd, &event, sizeof(event)) == sizeof(event)) {
+          last_event_time = current_time;
+
+          if (is_sleeping) {
+            is_sleeping = 0;
+            start_touch_pad();
+          }
+        }
+      }
+    }
+
+    close(epfd);
+    close(fd);
+    return 0;
+  } else {
+    fprintf(stderr, "Touchpad device %s not found\n", TOUCHPAD_NAME);
+    return 1;
+  }
+}