android5.0輸入系統新增自定義按鍵
申明:本按鍵新增沒有用到全志sys_config.fex配置io。
Board:全志R16
SDK:Android KitKat 4.4.2、Linux-3.4
開發內容:自定義按鍵名為SOCHIP_EXT1,接在R16開發板的GPIOB7口。
1.先在linux-3.4/inlcude/linux/input.h新增自定義按鍵#define SOCHIP_EXT1 0x2e8 該鍵值最好不要跟系統的鍵值衝突,然後編寫linux下的key driver程式碼。
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <mach/irqs.h>
#include <linux/interrupt.h>
#include <asm-generic/errno.h>
#include <asm-generic/errno-base.h>
#include <linux/gpio.h>
#include <mach/gpio.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/param.h>
#include <linux/jiffies.h>
#include <linux/ioport.h>
#include <linux/io.h>
#define KEYDEV_NAME "mykey"
#define MY_KEY KEY_SOCHIP_EXT1
#define KEY_GPIO GPIOB(7)
static int key_irq;
static struct timer_list *key_timer = NULL;
static struct input_dev *key_dev = NULL;
static void __iomem *key_reg;
static irqreturn_t isr_key_func(int irq, void *arg)
{
printk(KERN_EMERG "key intretupt is comming ...\n");
mod_timer(key_timer, jiffies + (HZ / 5));
return IRQ_HANDLED;
}
static void timer_handler(unsigned long arg)
{
//printk("10ms is comming ... \n");
unsigned int val;
val = gpio_get_value(KEY_GPIO);
printk("val = %d\n", val);
if(val == 0){
printk("key up ... \n");
input_report_key(key_dev, MY_KEY, 0);
input_sync(key_dev);
}else if(val == 1){
printk("key down ...\n");
input_report_key(key_dev, MY_KEY, 1);
input_sync(key_dev);
}
}
static int __init key_init(void)
{
int ret = 0;
printk("hello key driver\n");
//初始化定時器
key_timer = kzalloc(sizeof(struct timer_list), GFP_KERNEL);
if(!key_timer){
printk("kzalloc timer is failed!\n");
ret = -ENOMEM;
goto ERR1;
}
init_timer(key_timer);
key_timer->function = timer_handler;//定時服務函式
key_timer->expires = jiffies + (HZ / 10);//當前時間 + 定時時間
add_timer(key_timer);//新增定時器
//input結構體申請記憶體
key_dev = input_allocate_device();
if(!key_dev){
printk(KERN_EMERG "key: input_allocate_device failed!\n");
ret = -ENOMEM;
goto ERR2;
}
#if 1
key_dev->name = KEYDEV_NAME; //輸入裝置名字
key_dev->phys = "input22"; //裝置節點名稱
key_dev->id.bustype = BUS_HOST; //裝置標識ID屬性 用於與事件處理層進行匹配
key_dev->id.vendor = 0x0001;
key_dev->id.product = 0x0001;
key_dev->id.version = 0x0100;
#endif
set_bit(EV_KEY, key_dev->evbit);//設定支援的事件型別為key
set_bit(MY_KEY, key_dev->keybit);//設定裝置支援按鍵型別為MYKEY
//申請IO資源 第一種方式
ret = gpio_request(KEY_GPIO, NULL);
if(ret < 0){
printk(KERN_EMERG "gpio request failed!\n");
ret = -EBUSY;
return ret;
}
#if 0 //申請IO資源 第二種方式
if(!request_mem_region(KEY_GPIO, 4, "key")){
printk("requset_mem_region is failed!\n");
return -EBUSY;
}
#endif
//對映
key_reg = ioremap(KEY_GPIO, 4);
if(!key_reg){
printk("ioremap is failed!\n");
return -EIO;
}
//配置KEY_GPIO為中斷模式
iowrite32(0x4, key_reg);
//根據IO獲取中斷ID
key_irq = gpio_to_irq(KEY_GPIO);
if(key_irq == -ENXIO)
{
printk(KERN_EMERG "gpio_to_irq failed!\n");
ret = -ENXIO;
goto ERR3;
}
//2.申請中斷
if(request_irq(key_irq, isr_key_func, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, "key", NULL)){
ret = -EBUSY;
printk(KERN_EMERG "request irq failed!\n");
goto ERR4;
}
//3.向input子系統註冊device
ret = input_register_device(key_dev);
if(ret){
printk(KERN_EMERG "input register device failed!\n");
goto ERR5;
}
return 0;
ERR5:
free_irq(key_irq, NULL);
ERR4:
gpio_free(KEY_GPIO);
ERR3:
input_free_device(key_dev);
ERR2:
kfree(key_timer);
ERR1:
return ret;
}
static void __exit key_exit(void)
{
del_timer(key_timer); //刪除定時器
kfree(key_timer);//釋放記憶體
free_irq(key_irq, NULL); //釋放中斷id
iounmap(key_reg);//解對映
gpio_free(KEY_GPIO); //第二種方式釋放申請的記憶體資源
// release_mem_region(KEY_GPIO, 4); //第一種方式釋放申請的記憶體資源
input_unregister_device(key_dev);//解input註冊
printk("goodbye key driver\n");
}
module_init(key_init);
module_exit(key_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("orange");
MODULE_DESCRIPTION("key driver");
2.修改xxx.kl安卓下的按鍵對映檔案,R16平臺SDK對應的kl檔案在android/device/softwinner/xxx/configs/sunxi-keyboard.kl,也可通過cat /proc/bus/input/devices 可找到相應的驅動名。(其他kl檔案可在frameworks//base/data/keyboards/中找到)新增key 744 SOCHIP_EXT1。
3.修改framework層的相關檔案,R16平臺SDK相關檔案對應的路徑如下:
=>android/frameworks/native/include/input/KeycodeLabels.h中新增如下對應的程式碼:
246 { "ASSIST", 219 },
247 { "BRIGHTNESS_DOWN", 220 },
248 { "BRIGHTNESS_UP", 221 },
249 { "MEDIA_AUDIO_TRACK", 222 },
250 { "SOCHIP_EXT1" , 223}, ==>此處新增
=>android/frameworks/native/include/android/keycodes.h中新增如下對應的程式碼:
265 AKEYCODE_ASSIST = 219,
266 AKEYCODE_BRIGHTNESS_DOWN = 220,
267 AKEYCODE_BRIGHTNESS_UP = 221,
268 AKEYCODE_MEDIA_AUDIO_TRACK = 222,
269 AKEYCODE_SOCHIP_EXT1 = 223, ==>此處新增
=>android/frameworks/base/core/res/res/values/attrs.xml中新增如下對應的程式碼:
1566 <enum name="KEYCODE_ASSIST" value="219" />
1567 <enum name="KEYCODE_BRIGHTNESS_DOWN" value="220" />
1568 <enum name="KEYCODE_BRIGHTNESS_UP" value="221" />
1569 <enum name="KEYCODE_MEDIA_AUDIO_TRACK" value="222" />
1570 <enum name="KEYCODE_SOCHIP_EXT1" value="223" /> ==>此處新增
=>android/frameworks/base/core/Java/android/view/KeyEvent.java 此檔案有兩處修改,分別如下:
第一處修改:
631 public static final int KEYCODE_BRIGHTNESS_UP = 221;
632 /** Key code constant: Audio Track key
633 * Switches the audio tracks. */
634 public static final int KEYCODE_MEDIA_AUDIO_TRACK = 222;
635
636 public static final int KEYCODE_SOCHIP_EXT1 = 223; ==>此處新增
637
638 private static final int LAST_KEYCODE = KEYCODE_SOCHIP_EXT1;==>此處若LAST_KEYCODE對應的上一行是什麼按鍵就賦值什麼。
第二處修改:
879 names.append(KEYCODE_ASSIST, "KEYCODE_ASSIST");
880 names.append(KEYCODE_BRIGHTNESS_DOWN, "KEYCODE_BRIGHTNESS_DOWN");
881 names.append(KEYCODE_BRIGHTNESS_UP, "KEYCODE_BRIGHTNESS_UP");
882 names.append(KEYCODE_MEDIA_AUDIO_TRACK, "KEYCODE_MEDIA_AUDIO_TRACK");
883 names.append(KEYCODE_SOCHIP_EXT1, "KEYCODE_SOCHIP_EXT1");==>此處新增
=>android/device/softwinner/astar-evb/configs/sunxi-keyboard.kl中新增如下
1 key 102 HOME WAKE
2 key 28 BACK WAKE
3 key 139 MENU WAKE_DROPPED
4 key 114 VOLUME_UP
5 key 115 VOLUME_DOWN
6 key 744 SOCHIP_EXT1 ==>此處新增
=>android/frameworks/native/libs/input/Input.cpp =>修改 bool KeyEvent::isSystemKey(int32_t keyCode) ,新增AKEYCODE_SOCHIP_EXT1 ,如添加了代表此按鍵為系統按鍵。
109 case AKEYCODE_SEARCH:
110 case AKEYCODE_BRIGHTNESS_DOWN:
111 case AKEYCODE_BRIGHTNESS_UP:
112 case AKEYCODE_MEDIA_AUDIO_TRACK:
113 case AKEYCODE_SOCHIP_EXT1:
最後切記執行make update-api 把剛剛修改的內容更新,可在frameworks/base/api/current.txt找到更新後新增到裡面的按鍵內容,如本文,我們可以搜尋SOCHIP_EXT1,找到的內容如下:
27284 field public static final int KEYCODE_SLASH = 76; // 0x4c
27285 field public static final int KEYCODE_SOCHIP_EXT1 = 223; // 0xdf ==>此處
27286 field public static final int KEYCODE_SOFT_LEFT = 1; // 0x1
27287 field public static final int KEYCODE_SOFT_RIGHT = 2; // 0x2
若沒有執行make update-api是找不到你所新增的按鍵對應的內容,最後編譯、打包、燒錄,至此新增自定義按鍵成功,相關解析按鍵佈局的kl檔案可在frameworks/base/services/input/EventHub.cpp。