driver-tutorial finished

interrupt/interrupt.c

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+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+#include <linux/interrupt.h>
+
+irqreturn_t myIRQ(int irq, void *devid){
+    //Clear pending interrupt
+    return IRQ_HANDLED;
+}
+
+int my_open(void){
+    //Set polarity and type of interrupt
+
+    //this is the api to register interrupt to
+    //kernel driver.
+    requet_irq(30, myIRQ, 0, "MYIRQ", 1);
+    //This 30 is the line number in interrupt register
+    //stored. It's like a id to the interrupt handler.
+    //The last line is the decive number. If multiple
+    //device uses same IRQ handler, then this last argument
+    //is used to diffrentiate between various devices using
+    //the same IRQ Handler.
+}
+
+void my_release(void){
+    //To release the interrupt handler
+    //free_irq api is used.
+    free_irq(30,1);
+}

kernel_timer/.Module.symvers.cmd

@@ -0,0 +1 @@
+savedcmd_/home/junet/driver-tutorial/kernel_timer/Module.symvers :=  scripts/mod/modpost -M -m -a      -o /home/junet/driver-tutorial/kernel_timer/Module.symvers -T /home/junet/driver-tutorial/kernel_timer/modules.order -i Module.symvers -e 

kernel_timer/.demo_timer_driver.ko.cmd

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+savedcmd_/home/junet/driver-tutorial/kernel_timer/demo_timer_driver.ko := ld -r -m elf_x86_64 -z noexecstack --no-warn-rwx-segments --build-id=sha1  -T scripts/module.lds -o /home/junet/driver-tutorial/kernel_timer/demo_timer_driver.ko /home/junet/driver-tutorial/kernel_timer/demo_timer_driver.o /home/junet/driver-tutorial/kernel_timer/demo_timer_driver.mod.o

kernel_timer/.demo_timer_driver.mod.cmd

@@ -0,0 +1 @@
+savedcmd_/home/junet/driver-tutorial/kernel_timer/demo_timer_driver.mod := printf '%s\n'   demo_timer_driver.o | awk '!x[$$0]++ { print("/home/junet/driver-tutorial/kernel_timer/"$$0) }' > /home/junet/driver-tutorial/kernel_timer/demo_timer_driver.mod

kernel_timer/.modules.order.cmd

@@ -0,0 +1 @@
+savedcmd_/home/junet/driver-tutorial/kernel_timer/modules.order := {   echo /home/junet/driver-tutorial/kernel_timer/demo_timer_driver.o; :; } > /home/junet/driver-tutorial/kernel_timer/modules.order

kernel_timer/Makefile

@@ -0,0 +1,7 @@
+obj-m += demo_timer_driver.o
+
+all:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+
+clean:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

kernel_timer/demo_timer_driver.c

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+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kdev_t.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+
+//Timer Variable
+#define TIMEOUT 5000 //milliseconds
+static struct timer_list demo_timer;
+static unsigned int count = 0;
+
+dev_t dev = 0;
+static struct class *dev_class;
+static struct cdev demo_timer_cdev;
+static int __init demo_timer_driver_init(void);
+static void __exit demo_timer_driver_exit(void);
+
+/***************Driver fucntions******************/
+static int demo_timer_open(struct inode *inode, struct file *file);
+static int demo_timer_release(struct inode *inode , struct file *file);
+static ssize_t demo_timer_read(struct file *filp, char __user *buf, size_t len, loff_t *off);
+static ssize_t demo_timer_write(struct file *filp, const char __user *buf, size_t len, loff_t *off);
+/*************************************************/
+
+//File operation structure
+static struct file_operations fops = {
+    .owner          = THIS_MODULE,
+    .read           = demo_timer_read,
+    .write          = demo_timer_write,
+    .open           = demo_timer_open,
+    .release        = demo_timer_release
+};
+
+//Timer Callback function. This will be called when timer expires
+void timer_callback(struct timer_list *timer){
+    /* do your timer stuff here */
+    pr_info("Timer Callback function Called [%d]\n", count++);
+
+    /**
+     * Re-enable timer. Because this function will be called only first time.
+     * If we re-enable this will work like periodic timer.
+     */
+
+    mod_timer(&demo_timer, jiffies + msecs_to_jiffies(TIMEOUT));
+}
+
+/**
+ * This function will be called when we open the device file
+ */
+static int demo_timer_open(struct inode *inode, struct file *file){
+    pr_info("Device File Opened...!!!\n");
+    return 0;
+}
+
+/**
+ * This function will be called when we close the Device file
+ */
+static int demo_timer_release(struct inode *inode , struct file *file){
+    pr_info("Read Function\n");
+    return 0;    
+}
+
+/**
+ * This function will be called when we read the Device file
+ */
+static ssize_t demo_timer_read(struct file *filp, char __user *buf, size_t len, loff_t *off){
+    pr_info("Read function\n");
+    return 0;
+}
+
+/**
+ * This function will be called when we write the Device file
+ */
+static ssize_t demo_timer_write(struct file *filp, const char __user *buf, size_t len, loff_t *off){
+    pr_info("Write function\n");
+    return len;
+}
+
+/**
+ * Module Init function
+ */
+static int __init demo_timer_driver_init(void){
+    /*Allocating Major number*/
+    if(alloc_chrdev_region(&dev, 0, 1, "demo_timer_Dev") < 0 ){
+        pr_err("Cannot allocate major number\n");
+        return -1;
+    }
+
+    pr_info("Major = %d Minor = %d \n", MAJOR(dev), MINOR(dev));
+
+    /*Creating cdev structure*/
+    cdev_init(&demo_timer_cdev, &fops);
+
+    /*Adding character device to the system*/
+    if((cdev_add(&demo_timer_cdev, dev, 1)) < 0){
+        pr_err("Cannot add the device to the system\n");
+    }
+
+    /* setup your timer to call my_timer_callback */
+    timer_setup(&demo_timer, timer_callback, 0);
+
+    //We can also use add_timer.
+    /* setup timer interval to based on TIMEOUT Macro */
+    /* kernel timer should be in ticks or jiffs*/
+    mod_timer(&demo_timer, jiffies + msecs_to_jiffies(TIMEOUT));
+
+    pr_info("Device Driver Insert...Done!!!\n");
+    return 0;
+}
+
+/**
+ * 
+ * Module exit function
+ */
+
+static void __exit demo_timer_driver_exit(void){
+    /* remove kernel when unloading module */
+    del_timer(&demo_timer);
+    cdev_del(&demo_timer_cdev);
+    unregister_chrdev_region(dev, 1);
+    pr_info("Device Driver Remove...Done!!!\n");
+}
+
+module_init(demo_timer_driver_init);
+module_exit(demo_timer_driver_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Junet Hossain");
+MODULE_DESCRIPTION("A Simple kernel timer module");

kernel_timer/demo_timer_driver.mod

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+/home/junet/driver-tutorial/kernel_timer/demo_timer_driver.o

kernel_timer/demo_timer_driver.mod.c

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+#include <linux/module.h>
+#define INCLUDE_VERMAGIC
+#include <linux/build-salt.h>
+#include <linux/elfnote-lto.h>
+#include <linux/export-internal.h>
+#include <linux/vermagic.h>
+#include <linux/compiler.h>
+
+#ifdef CONFIG_UNWINDER_ORC
+#include <asm/orc_header.h>
+ORC_HEADER;
+#endif
+
+BUILD_SALT;
+BUILD_LTO_INFO;
+
+MODULE_INFO(vermagic, VERMAGIC_STRING);
+MODULE_INFO(name, KBUILD_MODNAME);
+
+__visible struct module __this_module
+__section(".gnu.linkonce.this_module") = {
+	.name = KBUILD_MODNAME,
+	.init = init_module,
+#ifdef CONFIG_MODULE_UNLOAD
+	.exit = cleanup_module,
+#endif
+	.arch = MODULE_ARCH_INIT,
+};
+
+#ifdef CONFIG_RETPOLINE
+MODULE_INFO(retpoline, "Y");
+#endif
+
+
+
+static const char ____versions[]
+__used __section("__versions") =
+	"\x1c\x00\x00\x00\x2b\x2f\xec\xe3"
+	"alloc_chrdev_region\0"
+	"\x14\x00\x00\x00\x5f\x7c\x28\xd8"
+	"cdev_init\0\0\0"
+	"\x14\x00\x00\x00\xda\xfb\x89\x12"
+	"cdev_add\0\0\0\0"
+	"\x18\x00\x00\x00\x39\x63\xf4\xc6"
+	"init_timer_key\0\0"
+	"\x18\x00\x00\x00\x55\x48\x0e\xdc"
+	"timer_delete\0\0\0\0"
+	"\x14\x00\x00\x00\xa2\x7e\x12\x7c"
+	"cdev_del\0\0\0\0"
+	"\x24\x00\x00\x00\x33\xb3\x91\x60"
+	"unregister_chrdev_region\0\0\0\0"
+	"\x14\x00\x00\x00\xbb\x6d\xfb\xbd"
+	"__fentry__\0\0"
+	"\x10\x00\x00\x00\x7e\x3a\x2c\x12"
+	"_printk\0"
+	"\x1c\x00\x00\x00\xca\x39\x82\x5b"
+	"__x86_return_thunk\0\0"
+	"\x10\x00\x00\x00\xa6\x50\xba\x15"
+	"jiffies\0"
+	"\x14\x00\x00\x00\xb8\x83\x8c\xc3"
+	"mod_timer\0\0\0"
+	"\x18\x00\x00\x00\xf8\x1a\x94\x92"
+	"module_layout\0\0\0"
+	"\x00\x00\x00\x00\x00\x00\x00\x00";
+
+MODULE_INFO(depends, "");
+
+
+MODULE_INFO(srcversion, "7D7C66AAC1FA4296375BED7");

kernel_timer/modules.order

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+/home/junet/driver-tutorial/kernel_timer/demo_timer_driver.o