使用cdev_add注册字符设备...

Makefile

@@ -2,7 +2,7 @@ all:github
 
 
 
-COMMIT="完善了thread_info的学习..."
+COMMIT="使用cdev_add注册字符设备..."
 
 .PHONY	:	github
 github:

books/fengguojin/src/1drivermodel/1-3register_chrdev/Makefile

@@ -0,0 +1,30 @@
+ROOT=.
+
+
+DIRS=	demo test
+
+all:
+	for i in $(DIRS); do \
+		(cd $$i && echo "making $$i" && $(MAKE) ) || exit 1; \
+	done
+
+
+clean:
+	for i in $(DIRS); do \
+		(cd $$i && echo "cleaning $$i" && $(MAKE) clean) || exit 1; \
+	done
+
+
+insmod:
+	cd demo && make insmod
+
+rmmod:
+	cd demo && make rmmod
+
+reinsmod:
+	cd demo && make reinsmod
+
+run	:
+	sudo ./test/test
+
+

books/fengguojin/src/1drivermodel/1-3register_chrdev/demo/.demo.ko.cmd

@@ -1 +0,0 @@
-cmd_/mnt/hgfs/windows/src/1drivermodel/1-3register_chrdev/demo/demo.ko := /usr/local/arm/4.2.2-eabi/usr/bin/arm-linux-ld -EL -r   -o /mnt/hgfs/windows/src/1drivermodel/1-3register_chrdev/demo/demo.ko /mnt/hgfs/windows/src/1drivermodel/1-3register_chrdev/demo/demo.o /mnt/hgfs/windows/src/1drivermodel/1-3register_chrdev/demo/demo.mod.o

books/fengguojin/src/1drivermodel/1-3register_chrdev/demo/.tmp_versions/demo.mod

@@ -1,2 +0,0 @@
-/mnt/hgfs/windows/src/1drivermodel/1-3register_chrdev/demo/demo.ko
-/mnt/hgfs/windows/src/1drivermodel/1-3register_chrdev/demo/demo.o

books/fengguojin/src/1drivermodel/1-3register_chrdev/demo/1

@@ -0,0 +1,80 @@
+# ------------------------------------------------------------------------------
+#
+# Makefile for the LDD-LinuxDeviceDrivers.
+#
+# Author: gatieme
+# Create: 2016-07-29 15:50:46
+# Last modified: 2016-07-29 16:10:29
+# Description:
+# 	This program is loaded as a kernel(v2.6.18 or later) module.
+# 	Use "make install" to load it into kernel.
+# 	Use "make remove" to remove the module out of kernel.
+#
+# ------------------------------------------------------------------------------
+
+
+ROOT=../../../../../
+#PLATFORM=$(shell $(ROOT)/systype.sh)
+#include $(ROOT)/Make.defines.$(PLATFORM)
+
+#	my driver description
+DRIVER_VERSION := "1.0.0"
+DRIVER_AUTHOR  := "Gatieme @ AderStep Inc..."
+DRIVER_DESC    := "Demo module for LDD-LinuxDeviceDrivers devices"
+DRIVER_LICENSE := "Dual BSD/GPL"
+
+
+MODULE_NAME := demo
+
+ifneq ($(KERNELRELEASE),)
+
+#CFG_FLAGS += -O2  -I./
+#EXTRA_CFLAGS  += $(C_FLAGS) $(CFG_INC) $(CFG_INC)
+
+
+
+obj-m := $(MODULE_NAME).o #smodule.o
+
+else
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+modules:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+modules_install:
+	make -C $(KERNELDIR) M=$(PWD) modules_install
+
+
+
+insmod:
+	sudo insmod $(MODULE_NAME).ko
+	sudo mknod /dev/fgj c 224 0
+
+reinsmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo insmod $(MODULE_NAME).ko
+
+rmmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo /bin/rm /dev/fgj
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+	rm -f modules.order Module.symvers Module.markers
+
+
+COMMIT="[1.1.4 带参数的可加载模块](http://book.51cto.com/art/201205/337663.htm)"
+github:
+	cd $(ROOT) && make github
+
+
+.PHNOY:
+	modules modules_install clean
+
+
+
+endif
+

books/fengguojin/src/1drivermodel/1-3register_chrdev/demo/Makefile

@@ -0,0 +1,80 @@
+# ------------------------------------------------------------------------------
+#
+# Makefile for the LDD-LinuxDeviceDrivers.
+#
+# Author: gatieme
+# Create: 2016-07-29 15:50:46
+# Last modified: 2016-07-29 16:10:29
+# Description:
+# 	This program is loaded as a kernel(v2.6.18 or later) module.
+# 	Use "make install" to load it into kernel.
+# 	Use "make remove" to remove the module out of kernel.
+#
+# ------------------------------------------------------------------------------
+
+
+ROOT=../../../../../
+#PLATFORM=$(shell $(ROOT)/systype.sh)
+#include $(ROOT)/Make.defines.$(PLATFORM)
+
+#	my driver description
+DRIVER_VERSION := "1.0.0"
+DRIVER_AUTHOR  := "Gatieme @ AderStep Inc..."
+DRIVER_DESC    := "Demo module for LDD-LinuxDeviceDrivers devices"
+DRIVER_LICENSE := "Dual BSD/GPL"
+
+
+MODULE_NAME := demo
+
+ifneq ($(KERNELRELEASE),)
+
+#CFG_FLAGS += -O2  -I./
+#EXTRA_CFLAGS  += $(C_FLAGS) $(CFG_INC) $(CFG_INC)
+
+
+
+obj-m := $(MODULE_NAME).o #smodule.o
+
+else
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+modules:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+modules_install:
+	make -C $(KERNELDIR) M=$(PWD) modules_install
+
+
+
+insmod:
+	sudo insmod $(MODULE_NAME).ko
+	sudo mknod /dev/fgj c 224 0
+
+reinsmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo insmod $(MODULE_NAME).ko
+
+rmmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo /bin/rm /dev/fgj
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+	rm -f modules.order Module.symvers Module.markers
+
+
+COMMIT="[1.1.4 带参数的可加载模块](http://book.51cto.com/art/201205/337663.htm)"
+github:
+	cd $(ROOT) && make github
+
+
+.PHNOY:
+	modules modules_install clean
+
+
+
+endif
+

books/fengguojin/src/1drivermodel/1-3register_chrdev/demo/demo.c

@@ -37,7 +37,7 @@ ssize_t simple_read(struct file *filp, char __user *buf, size_t count,loff_t *f_
 	/* 把数据拷贝到应用程序空间 */
 	if (copy_to_user(buf,demoBuffer,count))
 	{
-	   count=-EFAULT; 
+	   count=-EFAULT;
 	}
 	return count;
 }
@@ -65,14 +65,14 @@ struct file_operations simple_fops = {
 *******************************************************/
 void simple_cleanup_module(void)
 {
-    unregister_chrdev(simple_MAJOR,  "simple"); 
+    unregister_chrdev(simple_MAJOR,  "simple");
 	printk("simple_cleanup_module!\n");
 }
 
 int simple_init_module(void)
 {
 	int ret;
-	ret = register_chrdev(simple_MAJOR, "simple", &simple_fops);//注册设备号231，设备名 
+	ret = register_chrdev(simple_MAJOR, "simple", &simple_fops);//注册设备号231，设备名
 	if (ret < 0)
 	{
 		printk("Unable to register character device %d!\n",simple_MAJOR);

books/fengguojin/src/1drivermodel/1-3register_chrdev/demo/demo.h

@@ -1,4 +1,3 @@
-
 #ifndef _simple_H_
 #define _simple_H_
 
@@ -21,11 +20,15 @@
 #undef PDEBUGG
 #define PDEBUGG(fmt, args...) /* nothing: it's a placeholder */
 
-//设备号
+//  设备号
+//  error inserting 'globalmem.ko': -1 Device or resource busy
+//  出现这个原因是定义的设备号有冲突,
+//  可以通过cat /proc/devices查看有哪些设备号还没被使用
+//  或者直接由系统动态分配主设备号
 #define simple_MAJOR 224
 
 //设备结构
-struct simple_dev 
+struct simple_dev
 {
 	struct cdev cdev;	  /* Char device structure		*/
 };

books/fengguojin/src/1drivermodel/1-3register_chrdev/demo/demo.mod.c

@@ -1,21 +0,0 @@
-#include <linux/module.h>
-#include <linux/vermagic.h>
-#include <linux/compiler.h>
-
-MODULE_INFO(vermagic, VERMAGIC_STRING);
-
-struct module __this_module
-__attribute__((section(".gnu.linkonce.this_module"))) = {
- .name = KBUILD_MODNAME,
- .init = init_module,
-#ifdef CONFIG_MODULE_UNLOAD
- .exit = cleanup_module,
-#endif
- .arch = MODULE_ARCH_INIT,
-};
-
-static const char __module_depends[]
-__used
-__attribute__((section(".modinfo"))) =
-"depends=";
-

books/fengguojin/src/1drivermodel/1-3register_chrdev/demo/modules.order

@@ -1 +0,0 @@
-kernel//mnt/hgfs/windows/src/1drivermodel/1-3register_chrdev/demo/demo.ko

books/fengguojin/src/1drivermodel/1-3register_chrdev/test/Makefile

@@ -0,0 +1,25 @@
+ROOT=../../../
+
+target=test
+
+
+
+all:$(target)
+
+
+memorylayout : test.o
+	$(CC) $^ -o $@ $(LDFLAGS)
+	@echo "测试使用register_chrdev注册的字符设备..."
+
+%.o : %.c
+	$(CC) -c $^ -o $@  $(CFLAGS) $(DEFINES)
+
+clean :
+	rm -rf *.o
+	rm -rf $(target)
+
+
+run :
+	sudo ./test
+
+.PHONY	: clean run

books/fengguojin/src/1drivermodel/1-3register_chrdev/test/test.c

@@ -1,40 +1,54 @@
-#include<sys/types.h>
-#include<unistd.h>
-#include<fcntl.h>
-#include<linux/rtc.h>
-#include<linux/ioctl.h>
-#include<stdio.h>
-#include<stdlib.h>
 
-void main(void)
-{
-	int fd;
-	int i;
-	char data[256];
-	
-	int retval;
-	fd=open("/dev/fgj",O_RDWR);
-	if(fd==-1)
-	{
-		perror("error open\n");
-		exit(-1);
-	}
-	printf("open /dev/fgj successfully\n");
-	
-	retval=write(fd,"fgj",3);
-	if(retval==-1)
-	{
-		perror("write error\n");
-		exit(-1);
-	}
-	retval=read(fd,data,3);
-	if(retval==-1)
-	{
-		perror("read error\n");
-		exit(-1);
-	}
-	data[retval]=0;
-	printf("read successfully:%s\n",data);
-	
-	close(fd);
-}
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <linux/rtc.h>
+#include <linux/ioctl.h>
+
+
+
+
+
+#define MAX_LINE    256
+
+int main(void)
+{
+	int fd;
+	int i;
+	char data[MAX_LINE] = "Hello World!";
+	int retval;
+
+	fd = open("/dev/fgj",O_RDWR);
+	if(fd == -1)
+	{
+        perror("error open");
+		exit(-1);
+	}
+	printf("open /dev/fgj successfully\n");
+
+	retval = write(fd, data, strlen(data));
+	if(retval == -1)
+	{
+		perror("write error");
+		exit(-1);
+	}
+    else
+    {
+        printf("write data successfully\n");
+    }
+	retval = read(fd, data, MAX_LINE);
+	if(retval == -1)
+	{
+		perror("read error");
+		exit(-1);
+	}
+
+	data[retval] = '\0';
+	printf("read successfully:%s\n", data);
+
+	close(fd);
+}