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Android驅動開發之Hello實例：
驅動部分
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：用來測試驅動是否正常運行
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，用來允許mmi訪問/dev/hello節點
modified: ? device/qcom/sepolicy/common/mmi.temodified: ? external/sepolicy/device.temodified: ? 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 1static 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_HELLOtristate "Hello"depends on SPI=yhelpIf you say yes here you get supoort for Hello'shello 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 > ¶ms){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 > ¶ms){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 $(CLEAR_VARS)LOCAL_MODULE_OWNER := qtiLOCAL_PROPRIETARY_MODULE := trueLOCAL_SRC_FILES := hello.cppLOCAL_MODULE := mmi_helloLOCAL_CLANG := falseLOCAL_MODULE_TAGS := optionalLOCAL_CFLAGS := -WallLOCAL_C_INCLUDES := external/libcxx/include \
?? ?$(QC_PROP_ROOT)/fastmmi/libmmiLOCAL_SHARED_LIBRARIES := libcutils libutils libmmi libhardware libc++LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/includeifeq ($(TARGET_COMPILE_WITH_MSM_KERNEL), true)LOCAL_ADDITIONAL_DEPENDENCIES := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usrendifinclude $(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.xmlLOCAL_CFLAGS := -WallLOCAL_MODULE := layout_hello.xmlLOCAL_MODULE_CLASS := ETCLOCAL_MODULE_TAGS := optionalLOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/mmi/layoutinclude $(BUILD_PREBUILT)
***************************************************
11)?vendor/qcom/proprietary/fastmmi/res/config/mmi-W200_W.cfg
[HELLO]lib_name=mmi_hello.soenable=1automation=0display_name=hellolayout=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 testtype 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};
以上為全部測試代碼：
打印內核消息為：adb shell cat /proc/kmsg
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