import upstream maccel baseline

2026-03-24 12:10:31 +00:00
parent 6e948d7b39
commit 5f1254d11a
108 changed files with 18930 additions and 0 deletions
@@ -0,0 +1,93 @@
+#ifndef _INPUT_ECHO_
+#define _INPUT_ECHO_
+
+#include "fixedptc.h"
+#include "linux/cdev.h"
+#include "linux/fs.h"
+#include "speed.h"
+#include <linux/version.h>
+
+int create_char_device(void);
+void destroy_char_device(void);
+
+static struct cdev device;
+static struct class *device_class;
+static dev_t device_number;
+
+/*
+ * Convert an int into an array of four/eight bytes, in big endian (MSB first)
+ */
+static void fpt_to_int_be_bytes(fpt num, char bytes[sizeof(fpt)]) {
+#define byte(i) (FIXEDPT_BITS - (i * 8))
+  bytes[0] = (num >> byte(1)) & 0xFF; // Most significant byte
+  bytes[1] = (num >> byte(2)) & 0xFF;
+  bytes[2] = (num >> byte(3)) & 0xFF;
+#if FIXEDPT_BITS == 64
+  if (sizeof(fpt) == 8) {
+    bytes[3] = (num >> byte(4)) & 0xFF;
+    bytes[4] = (num >> byte(5)) & 0xFF;
+    bytes[5] = (num >> byte(6)) & 0xFF;
+    bytes[6] = (num >> byte(7)) & 0xFF;
+    bytes[7] = num & 0xFF; // Least significant byte
+    return;
+  }
+#else
+  bytes[3] = num & 0xFF; // Least significant byte
+#endif
+}
+
+static ssize_t read(struct file *f, char __user *user_buffer, size_t size,
+                    loff_t *offset) {
+  dbg("echoing speed to userspace: %s", fptoa(LAST_INPUT_MOUSE_SPEED));
+
+  char be_bytes_for_int[sizeof(fpt)] = {0};
+  fpt_to_int_be_bytes(LAST_INPUT_MOUSE_SPEED, be_bytes_for_int);
+
+  int err =
+      copy_to_user(user_buffer, be_bytes_for_int, sizeof(be_bytes_for_int));
+  if (err)
+    return -EFAULT;
+
+  return sizeof(be_bytes_for_int);
+}
+
+struct file_operations fops = {.owner = THIS_MODULE, .read = read};
+
+int create_char_device(void) {
+  int err;
+  err = alloc_chrdev_region(&device_number, 0, 1, "maccel");
+  if (err)
+    return -EIO;
+
+  cdev_init(&device, &fops);
+  cdev_add(&device, device_number, 1);
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(6, 4, 0))
+  device_class = class_create(THIS_MODULE, "maccel");
+#else
+  device.owner = THIS_MODULE;
+  device_class = class_create("maccel");
+#endif
+
+  if (IS_ERR(device_class)) {
+    goto err_free_cdev;
+  }
+
+  device_create(device_class, NULL, device_number, NULL, "maccel");
+
+  return 0;
+
+err_free_cdev:
+  cdev_del(&device);
+  unregister_chrdev_region(device_number, 1);
+  return -EIO;
+}
+
+void destroy_char_device(void) {
+  device_destroy(device_class, device_number);
+  class_destroy(device_class);
+  cdev_del(&device);
+  unregister_chrdev_region(device_number, 1);
+}
+
+#endif // !_INPUT_ECHO_