From 3c1a29ca115d6ad1f0a35be80232d23ee69f5230 Mon Sep 17 00:00:00 2001
From: Siegfried Kienzle <siegfried.kienzle@gmx.de>
Date: Wed, 7 Jun 2017 08:10:20 +0200
Subject: [PATCH] try to implement the infrared_sensor-module

---
 .../module/infrared_sensor/infrared_sensor.c  | 121 ++++++++++++++++++
 .../infrared_sensor/infrared_sensor.def.h     |   4 +
 2 files changed, 125 insertions(+)
 create mode 100644 project/module/infrared_sensor/infrared_sensor.c
 create mode 100644 project/module/infrared_sensor/infrared_sensor.def.h

diff --git a/project/module/infrared_sensor/infrared_sensor.c b/project/module/infrared_sensor/infrared_sensor.c
new file mode 100644
index 0000000..04852c1
--- /dev/null
+++ b/project/module/infrared_sensor/infrared_sensor.c
@@ -0,0 +1,121 @@
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/gpio.h>
+#include <linux/kobject.h>
+#include <linux/device.h>
+#include <linux/uaccess.h>
+
+#define DEVICE_NAME "infrared_sensor";
+#define NUMBER_OF_MINOR_DEVICE (1);
+
+#include "infrared_sensor.def.h"
+
+
+static int black_white_open(struct inode devfile, struct file *instance) 
+{
+
+}
+
+static ssize_t black_white_read( struct file *instance, char __user *buffer,
+							size_t max_bytes_to_read, loff_t *offset)
+{
+
+}
+
+static int black_white_close( struct inode devfile, struct file *instance)
+{
+	
+}
+
+
+static struct file_operations fops = {
+	.owner = THIS_MODULE,
+	.open = black_white_open,
+	.release = black_white_close,
+	.read = black_white_read,
+};
+
+MODULE_AUTHOR("Manuel Vögele, Siegfried Kienzle, Simon Wörner");
+MODULE_DESCRIPTION(DEVICE_NAME "driver");
+MODULE_LICENSE("GPL");
+
+static int __init ModInit(void)
+{
+    unsigned int i = 0;
+
+    printk(KERN_DEBUG DEVICE_NAME ": init");
+
+    if (alloc_chrdev_region(&devno, 0, NUMBER_OF_MINOR_DEVICE, DEVICE_NAME) < 0)
+        return -EIO;
+
+    cdev_init(&chardev, &fops);
+    chardev.owner = THIS_MODULE;
+    chardev.ops = &fops;
+
+    if (cdev_add(&chardev, devno, NUMBER_OF_MINOR_DEVICE)) {
+        pr_err(DEVICE_NAME ": cdev_add failed.");
+        goto free_device_number;
+    }
+
+    chardev_class = class_create(THIS_MODULE, DEVICE_NAME);
+
+    if (IS_ERR(chardev_class)) {
+        pr_err(DEVICE_NAME ": no udev support\n");
+        goto free_cdev;
+    }
+
+    for (i = 0; i < NUMBER_OF_MINOR_DEVICE; ++i)
+    {
+#if NUMBER_OF_MINOR_DEVICE == 1
+        chardev_device[i] = device_create(chardev_class, NULL, devno + i, NULL, DEVICE_NAME);
+#else
+        chardev_device[i] = device_create(chardev_class, NULL, devno + i, NULL, DEVICE_NAME "%d", i);
+#endif
+
+        if (IS_ERR(chardev_device[i])) {
+            pr_err(DEVICE_NAME ": device create failed\n");
+            goto free_device;
+        }
+    }
+
+#ifdef CUSTOM_INIT
+    CUSTOM_INIT
+#endif
+
+    return 0;
+
+free_device:
+    for (; i > 0; --i) {
+        device_destroy(chardev_class, devno + i - 1);
+    }
+    class_destroy(chardev_class);
+free_cdev:
+    cdev_del(&chardev);
+free_device_number:
+    unregister_chrdev_region(devno, NUMBER_OF_MINOR_DEVICE);
+    return -EIO;
+}
+
+static void __exit ModExit(void)
+{
+    unsigned int i = 0;
+
+    printk(KERN_DEBUG DEVICE_NAME ": exit");
+
+#ifdef CUSTOM_EXIT
+    CUSTOM_EXIT
+#endif
+
+    for (i = NUMBER_OF_MINOR_DEVICE; i > 0; --i) {
+        device_destroy(chardev_class, devno + i - 1);
+    }
+    class_destroy(chardev_class);
+    cdev_del(&chardev);
+    unregister_chrdev_region(devno, NUMBER_OF_MINOR_DEVICE);
+}
+
+module_init( ModInit );
+module_exit( ModExit );
diff --git a/project/module/infrared_sensor/infrared_sensor.def.h b/project/module/infrared_sensor/infrared_sensor.def.h
new file mode 100644
index 0000000..dfe45f0
--- /dev/null
+++ b/project/module/infrared_sensor/infrared_sensor.def.h
@@ -0,0 +1,4 @@
+static dev_t devno;
+static struct cdev chardev;
+static struct class *chardev_class;
+static struct device *chardev_device[NUMBER_OF_MINOR_DEVICE];