Android驱动开发之Hello实例

Android驱动开发之Hello实例：

 

驱动部分

modified:   kernel/arch/arm/configs/msm8909-1gb_w100_hd720p-perf_defconfig

modified:   kernel/arch/arm/configs/msm8909-1gb_w100_hd720p_defconfig

modified:   kernel/drivers/input/misc/Kconfig

modified:   kernel/drivers/input/misc/Makefile

                kernel/drivers/input/misc/hello.c

 

FFBM部分：用来测试驱动是否正常运行

modified:   vendor/qcom/proprietary/common/build/fastmmi/mmi.mk

modified:   vendor/qcom/proprietary/fastmmi/res/config/mmi-W200_W.cfg

modified:   vendor/qcom/proprietary/fastmmi/res/layout/Android.mk

modified:   vendor/qcom/proprietary/fastmmi/res/values/strings.xml

                vendor/qcom/proprietary/fastmmi/module/hello/

                vendor/qcom/proprietary/fastmmi/module/hello/Android.mk

                vendor/qcom/proprietary/fastmmi/module/hello/hello.cpp

                vendor/qcom/proprietary/fastmmi/res/layout/layout_hello.xml

 

SELinux安全，用来允许mmi访问/dev/hello节点

modified:   device/qcom/sepolicy/common/mmi.te

modified:   external/sepolicy/device.te

modified:   external/sepolicy/file_contexts

 

 

1) kernel/drivers/input/misc/hello.c

 

#include <linux/types.h>

#include <linux/module.h>

#include <linux/fs.h>

#include <linux/init.h>

#include <linux/cdev.h>

#include <linux/device.h>

#include <linux/slab.h>

#include <asm/uaccess.h>

 

MODULE_AUTHOR("zhaopuqing");

MODULE_LICENSE("Dual BSD/GPL");

MODULE_VERSION("hello v1.0");

MODULE_ALIAS("Hello");

 

#define DEVICE_SUM 1

 

static int hello_open(struct inode *inode, struct file *filp);

static int hello_release(struct inode *, struct file *filp);

static ssize_t hello_read(struct file*, char*, size_t, loff_t*);

static ssize_t hello_write(struct file*, const char*, size_t, loff_t*);

 

/*the major device number*/

static int hello_major = 0;

static int hello_minor = 0;

 

static struct class* hello_class = NULL;

 

/*init the file_operations structure*/

struct file_operations hello_fops = {

    .owner = THIS_MODULE,

    .open = hello_open,

    .release = hello_release,

    .read = hello_read,

    .write = hello_write,

};

 

struct cdev *cdev;

 

static int global_var = 0; /*global var*/

 

/*module init*/

static int __init hello_init(void){

    int ret = 0;

    struct device* temp = NULL;

    dev_t devno = 0;

    printk("hello:hello_init.\n");

 

    ret = alloc_chrdev_region(&devno, hello_minor, DEVICE_SUM, "hello");

    if(ret < 0){

        printk(KERN_ALERT"hello:Failed to alloc char dev region.\n");

goto fail;

    }

 

    hello_major = MAJOR(devno);

    hello_minor = MINOR(devno);

 

    cdev = cdev_alloc();

    cdev->owner = THIS_MODULE;

    cdev->ops = &hello_fops;

    if((ret = cdev_add(cdev, devno, 1))){

        printk(KERN_NOTICE"Hello:Error%d adding hello.\n", ret);

return 0;

    }else{

        printk(KERN_ALERT"hello:hello register success.\n");

    }

 

    hello_class = class_create(THIS_MODULE, "hello");

    if(IS_ERR(hello_class)){

        ret = PTR_ERR(hello_class);

printk(KERN_ALERT"Failed to create hello class.\n");

goto destroy_cdev;

    }

 

    temp = device_create(hello_class, NULL, devno, "%s", "hello");

    if(IS_ERR(temp)){

     ret = PTR_ERR(temp);

printk(KERN_ALERT"Failed to create hello device.");

goto destroy_class;

    }

 

    return ret;

 

    destroy_class:

     class_destroy(hello_class);

    destroy_cdev:

     cdev_del(cdev);

    fail:

     return ret;

}

 

static void __exit hello_exit(void){

    

    dev_t devno = MKDEV(hello_major, 0);

    printk(KERN_ALERT"Goodbye, cruel world\n");

    

    /*remove cdev from kernel*/

    cdev_del(cdev);

 

    /*unregister the device device driver*/

    unregister_chrdev_region(devno, 1);

 

    /*free the dev structure*/

    if(cdev)

     kfree(cdev);

    cdev = NULL;

}

 

/*open device*/

static int hello_open(struct inode *inode, struct file *filp){

    int ret = 0;

    printk(KERN_ALERT"kernel:open success.\n");

    return ret;

}

 

/*release device*/

static int hello_release(struct inode *inode, struct file *filp){

    printk(KERN_ALERT"kernel:release success.\n");

    return 0;

}

 

/*read device*/

static int hello_read(struct file *filp, char *buf, size_t len, loff_t *off){

    printk(KERN_ALERT"kernel:reading...\n");

    if(copy_to_user(buf, &global_var, sizeof(int))){

        return -EFAULT;

    }

    return sizeof(int);

}

 

/*write device*/

static ssize_t hello_write(struct file *filp, const char *buf, size_t len, loff_t *off){

    printk(KERN_ALERT"kernel:writing...\n");

    if(copy_from_user(&global_var, buf, sizeof(int))){

        return -EFAULT;

    }

    return sizeof(int);

}

 

/*module register*/

module_init(hello_init);

module_exit(hello_exit);

 

******************************************************

2) kernel/drivers/input/misc/Kconfig

config SENSORS_HELLO

       tristate "Hello"

       depends on SPI=y

       help

         If you say yes here you get supoort for Hello's

         hello test.

 

 

******************************************************

3) kernel/drivers/input/misc/Makefile

obj-$(CONFIG_SENSORS_HELLO)     += hello.o

 

******************************************************

4) kernel/arch/arm/configs/msm8909-1gb_w100_hd720p-perf_defconfig

CONFIG_SENSORS_HELLO=y

 

*******************************************************

5) kernel/arch/arm/configs/msm8909-1gb_w100_hd720p_defconfig

CONFIG_SENSORS_HELLO=y

 

**************************************************

6) vendor/qcom/proprietary/fastmmi/module/hello/hello.cpp

#include "mmi_module.h"

 

#define TAG "Hello"

#define DEVICE_NAME "/dev/hello"

#define HELLO_TEST_WAIT "hello test,please waitting...."

#define HELLO_TEST_SUCCESS "hello test success!"

#define HELLO_TEST_FAILED "hello test failed!"

 

static const mmi_module_t* g_module;

static unordered_map < string, string > paras;

 

static void cb_function(const char *str, int size){

    if(g_module != NULL){

        g_module->cb_print(paras[KEY_MODULE_NAME].c_str(),SUBCMD_MMI, str, size, PRINT);

    }

}

 

int hello_test(){

    ALOGI("%s : %s start!\n", TAG, __FUNCTION__);

 

    int fd = -1;

    int val = 0;

 

    fd = open(DEVICE_NAME, O_RDWR);

    if(fd <= 0){

     ALOGI("%s : %s open device [%s] failed!\n", TAG, __FUNCTION__, DEVICE_NAME);

return FAILED;

    }

 

    ALOGI("%s : %s start to read device info!\n", TAG, __FUNCTION__);

    read(fd, &val, sizeof(val));

    ALOGI("%s : %s read value=%d\n", TAG, __FUNCTION__, val);

 

    ALOGI("********************************************\n");

    val = 5;

    ALOGI("%s : %s start write value %d to %s\n", TAG, __FUNCTION__, val, DEVICE_NAME);

    write(fd, &val, sizeof(val));

 

    ALOGI("*********************************************\n");

    ALOGI("%s : %s read device value again!\n", TAG, __FUNCTION__);

    read(fd, &val, sizeof(val));

    ALOGI("%s : %s read value=%d\n", TAG, __FUNCTION__, val);

 

    close(fd);

 

    return SUCCESS;

}

 

static int32_t module_init(const mmi_module_t * module, unordered_map < string, string > &params){

    ALOGI("%s : %s start!\n", TAG, __FUNCTION__);

    

    if(module == NULL){

     ALOGE("%s : %s NULL point received!\n", __FUNCTION__);

return FAILED;

    }

 

    return SUCCESS;

}

 

static int32_t module_deinit(const mmi_module_t * module){

    ALOGI("%s : %s start!\n", TAG, __FUNCTION__);

 

    if(module == NULL){

     ALOGE("%s : %s NULL point received!\n", TAG, __FUNCTION__);

return FAILED;

    }

 

    return SUCCESS;

}

 

static int32_t module_run(const mmi_module_t * module, const char *cmd, unordered_map < string ,string > &params){

    int ret = FAILED;

 

    if(!module || !cmd){

     ALOGE("%s : %s NULL point received!\n", TAG, __FUNCTION__);

return FAILED;

    }

 

    g_module = module;

    paras = params;

    ALOGI("%s start.command : %s\n", __FUNCTION__, cmd);

    cb_function(HELLO_TEST_WAIT, strlen(HELLO_TEST_WAIT));

 

    if(!strcmp(cmd, SUBCMD_MMI)){

ret = hello_test();

if(ret != SUCCESS){

    ALOGE("%s : %s open hello module failed!\n", TAG, __FUNCTION__);

    cb_function(HELLO_TEST_FAILED, strlen(HELLO_TEST_FAILED));

}else{

    ALOGI("%s : %s open hello module success!\n", TAG, __FUNCTION__);

    cb_function(HELLO_TEST_SUCCESS, strlen(HELLO_TEST_SUCCESS));

}

    }else if(!strcmp(cmd, SUBCMD_PCBA)){

    

    }else{

     ALOGE("%s : %s Invalid command : %s received!\n", TAG, __FUNCTION__, cmd);

ret = FAILED;

    }

 

    return ret;

}

 

static int32_t module_stop(const mmi_module_t *module){

    ALOGI("%s : %s start.\n", __FUNCTION__);

    if(module == NULL){

     ALOGE("%s : %s NULL point received!\n", TAG, __FUNCTION__);

return FAILED;

    }

 

    pthread_kill(module->run_pid, SIGUSR1);

    return SUCCESS;

}

 

static struct mmi_module_methods_t module_methods = {

    .module_init = module_init,

    .module_deinit = module_deinit,

    .module_run = module_run,

    .module_stop = module_stop,

};

 

mmi_module_t MMI_MODULE_INFO_SYM = {

    .version_major = 1,

    .version_minor = 0,

    .name = "Hello",

    .author = "Hello test",

    .methods = &module_methods,

    .module_handle = NULL,

    .supported_cmd_list = NULL,

    .supported_cmd_list_size = 0,

    .cb_print = NULL,

    .run_pid = -1,

};

 

*****************************************************

7) vendor/qcom/proprietary/fastmmi/module/hello/Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE_OWNER := qti

LOCAL_PROPRIETARY_MODULE := true

LOCAL_SRC_FILES := hello.cpp

 

LOCAL_MODULE := mmi_hello

LOCAL_CLANG := false

LOCAL_MODULE_TAGS := optional

LOCAL_CFLAGS := -Wall

LOCAL_C_INCLUDES := external/libcxx/include \

    $(QC_PROP_ROOT)/fastmmi/libmmi

 

LOCAL_SHARED_LIBRARIES := libcutils libutils libmmi libhardware libc++

 

LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include

ifeq ($(TARGET_COMPILE_WITH_MSM_KERNEL), true)

LOCAL_ADDITIONAL_DEPENDENCIES := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr

endif

 

include $(BUILD_SHARED_LIBRARY)

 

********************************************************

8) vendor/qcom/proprietary/fastmmi/res/layout/layout_hello.xml

<?xml version="1.0" encoding="utf-8"?>

<layout>

    <include layout="header.xml" />

 

    <button

     name="instruction"

text="hello_notice"

w_rel="100"

h_rel="10"

x_rel="0"

y_rel="12"

color="0x007D7DFF" />

    <textview

     name="display"

text=""

w_rel="100"

h_rel="60"

x_rel="4"

y_rel="27" />

 

    <include layout="footer.xml" />

</layout>

 

********************************************

9) vendor/qcom/proprietary/fastmmi/res/values/strings.xml

<string name="hello">Hello</string>

<string name="hell_notice">Hello test, just for test!</string>

 

**************************************************

10) vendor/qcom/proprietary/fastmmi/res/layout/Android.mk

 

include $(CLEAR_VARS)

LOCAL_SRC_FILES := layout_hello.xml

LOCAL_CFLAGS := -Wall

LOCAL_MODULE := layout_hello.xml

LOCAL_MODULE_CLASS := ETC

LOCAL_MODULE_TAGS := optional

LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/mmi/layout

include $(BUILD_PREBUILT)

 

***************************************************

11) vendor/qcom/proprietary/fastmmi/res/config/mmi-W200_W.cfg

[HELLO]

lib_name=mmi_hello.so

enable=1

automation=0

display_name=hello

layout=layout_hello.xml

 

**********************************************

12) vendor/qcom/proprietary/common/build/fastmmi/mmi.mk

MMI += mmi_hello

 

MMI_RES += layout_hello.xml

 

************************************************

13) external/sepolicy/device.te

#hello test

type hello_device, dev_type;

 

************************************************

14) external/sepolicy/file_contexts

#hello test

/dev/hello    u:object_r:hello_device:s0

 

***************************************************

15) device/qcom/sepolicy/common/mmi.te

allow mmi hello_device:chr_file {open read write};

 

以上为全部测试代码：

打印内核消息为：adb shell cat /proc/kmsg