Linux 驱动之模块参数--Linux设备驱动程序--http://blog.csdn.net/gatieme/article/details/51009094

study/param/.param.ko.cmd

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+cmd_/home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/param/param.ko := ld -r -m elf_x86_64 -T ./scripts/module-common.lds --build-id  -o /home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/param/param.ko /home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/param/param.o /home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/param/param.mod.o

study/param/.tmp_versions/param.mod

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+/home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/param/param.ko
+/home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/param/param.o

study/param/Makefile

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+
+
+obj-m := param.o
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+all:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+

study/param/modules.order

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+kernel//home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/param/param.ko

study/param/param.c

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+/*************************************************************************
+    > File Name: param.c
+    > Author: GatieMe
+    > Mail: gatieme@163.com
+    > Created Time: 2016年04月01日 星期五 21时37分37秒
+ ************************************************************************/
+
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+
+/*
+ *  在模块里面, 声明一个变量（全局变量）,
+ *  用来接收用户加载模块哦时传递的参数
+ *
+ *  module_param(name, type, perm)
+ **/
+static int value = 0;
+module_param(value, int, 0644);
+MODULE_PARM_DESC(value_int, "Get an value from user...\n");
+
+/*
+ *  在模块内部变量的名字和加载模块时传递的参数名字不同
+ *
+ *  module_param_named(name_out, name_in, type, perm)
+ *
+ *  @name_out    加载模块时，参数的名字
+ *  @name_in     模块内部变量的名字
+ *  @type        参数类型
+ *  @perm        访问权限
+ * */
+static int  value_in = 0;
+module_param_named(value_out, value_in, int, 0644);
+MODULE_PARM_DESC(value_in, "value_in named var_out...\n");
+
+
+/*
+ *  加载模块的时候, 传递字符串到模块的一个全局字符数组里面
+ *
+ *  module_param_string(name, string, len, perm)
+ *
+ *  @name   在加载模块时，参数的名字
+ *  @string 模块内部的字符数组的名字
+ *  @len    模块内部的字符数组的大小
+ *  #perm   访问权限
+ *
+ * */
+static char *string = NULL;
+module_param(string, charp, 0644);
+MODULE_PARM_DESC(string, "Get an string(char *) value from user...\n");
+
+
+static char buffer[20] = "gatieme";
+module_param_string(buffer, buffer, sizeof(buffer), 0644);
+MODULE_PARM_DESC(value_charp, "Get an string buffer from user...\n");
+
+
+/*
+ *  加载模块的时候, 传递参数到模块的数组中
+ *
+ *  module_param_array(name, type, num_point, perm)
+ *
+ *  @name       模块的数组名，也是外部制定的数组名
+ *  @type       模块数组的数据类型
+ *  @num_point  用来获取用户在加载模块时传递的参数个数,
+ *              为NULL时，表示不关心用户传递的参数个数
+ *  @perm       访问权限
+ *
+ * */
+static int  array[3];
+int         num;
+module_param_array(array, int, &num, 0644);
+MODULE_PARM_DESC(array, "Get an array from user...\n");
+
+
+
+
+int __init  param_module_init(void)
+{
+    int index = 0;
+
+    printk("\n---------------------\n");
+    printk("value       : %d\n", value);
+    printk("value_in    : %d\n", value_in);
+    printk("string      : %s\n", string);
+    printk("buffer      : %s\n", buffer);
+
+    for(index = 0; index < num; index++)
+    {
+    printk("array[%2d]   :   %d\n", index, array[index]);
+    }
+    printk("---------------------\n");
+
+    return 0;
+}
+
+void __exit param_module_exit(void)
+{
+    printk("\n---------------------\n");
+    printk("exit param dobule\n");
+    printk("---------------------\n");
+}
+
+
+module_init(param_module_init);
+module_exit(param_module_exit);
+
+

study/param/param.mod.c

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+#include <linux/module.h>
+#include <linux/vermagic.h>
+#include <linux/compiler.h>
+
+MODULE_INFO(vermagic, VERMAGIC_STRING);
+
+__visible 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 struct modversion_info ____versions[]
+__used
+__attribute__((section("__versions"))) = {
+	{ 0xa139692d, __VMLINUX_SYMBOL_STR(module_layout) },
+	{ 0x62a79a6c, __VMLINUX_SYMBOL_STR(param_ops_charp) },
+	{ 0xb71871f6, __VMLINUX_SYMBOL_STR(param_ops_string) },
+	{ 0x51eafc8e, __VMLINUX_SYMBOL_STR(param_ops_int) },
+	{ 0x1f54e93d, __VMLINUX_SYMBOL_STR(param_array_ops) },
+	{ 0x27e1a049, __VMLINUX_SYMBOL_STR(printk) },
+};
+
+static const char __module_depends[]
+__used
+__attribute__((section(".modinfo"))) =
+"depends=";
+
+
+MODULE_INFO(srcversion, "6E71C9CD204443CA3FC9684");