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"?>

<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" />

</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

转载于:https://www.cnblogs.com/wanghuaijun/p/7749414.html

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