android系统触摸屏虚拟按键

（一）虚拟按键的描述可以见韩超和梁泉的《Android系统级深入开发——移植与调试》的第八章：
虚拟按键（Virtual Key）是Eclair版本开始增加的新特性。Virtual Key的功能是利用触摸屏，模拟按键发生的事件，这样就可以利用触摸屏的边缘，实现一些可以自定义的按键效果。
虚拟按键的实现效果如图8-5所示。



图8-5 虚拟按键的实现效果
在Android系统中，触摸屏设备发送的是RawInputEvent（原始输入事件），而按键发送的是KeyEvent（按键事件）。KeyEvent直接发送给应用程序层，RawInputEvent在Android的Java框架中被转换成MotionEvent发送给应用程序层。
在Android系统中虚拟按键的实现方法是：在某种情况下，将RawInputEvent转换成KeyEvent。
frameworks/base/services/Java/com/android/server目录中的InputDevice.Java文件负责处理虚拟按键的主要文件。
虚拟按键的处理相对简单，需要根据以下文件对虚拟按键的内容进行配置：
/sys/board_properties/virtualkeys.{devicename}
在InputDevice.Java文件中通过readVirtualKeys，对进行消息的转化。根据配置文件将RawInputEvent转换成按键相关的内容。
virtualkeys.{devicename}是虚拟按键的适配文件，需要在目标文件系统的/sys/board_ properties/目录中。
虚拟按键配置文件的格式如下所示：
0x1:扫描码:X:Y:W:H:0x1: ……
例如，在MSM的mahimahi平台上查看虚拟按键的配置文件如下所示：
# cat /sys/board_properties/virtualkeys.synaptics-rmi-touchscreen
0x01:158:55:835:90:55:0x01:139:172:835:125:55:0x01:102:298:835:115:55:0x01:217:412:835:95:55
由此可见，其中定义了4个区域的虚拟按键，它们的Y坐标相同，可见4个按键的矩形区域位于水平的一排。其转换的扫描码分别为158，139，102，217，分别对应于BACK（返回），MENU（菜单），HOME（主界面），SEARCH（搜索）这4个按键。
另外一个系统的虚拟按键的配置文件如下所示：
$ cat /sys/board_properties/virtualkeys.qtouch-touchscreen
0x01:139:90:936:116:104:0x01:102:252:936:116:104:0x01:158:402:936:116:104
其转换的扫描码分别为：139，102，158，分别对应于MENU（菜单），HOME（主界面），BACK（返回）这3个按键。
提示：使用虚拟按键转换成为的是按键的扫描码，不是按键码，因此依然需要经过按键布局文件的转化才能得到按键码。
（二）如果按照韩超和梁泉的《Android系统级深入开发——移植与调试》的第八章描述虚拟按键的实现过程如下：
1.硬件分析
我所使用的触摸屏分辨率是1158*768，可视区域大小是1024*768（这也是LCD屏的大小），在触摸屏两侧总有5个按键。

2.触摸屏按键驱动的修改
既然可视区域在触摸屏中间部位，因此需要在触摸屏驱动中修改input_set_abs_params()函数中的参数

input_set_abs_params(input_dev, ABS_MT_POSITION_X, 61, 1085,
0, 0);

input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, SCREEN_MAX_Y,
0, 0);

其中61是可视区域左侧x轴左边坐标，1085是右侧的。

3.Android框架层

Android上层通过读取触摸屏坐标并经过转算后来识别定义好的虚拟按键，代码位于frameworks/base/services/java/com/android/server/KeyInputQueue.java中：

static class Virtualkey{}是负责按键定位的方法；

private void readVirtualKeys(String deviceName)负责读取sys文件，这是最重要的代码，也是与底层sys文件系统沟通的桥梁，它会读取/sys/board_properties/virtualkeys.{deviceName}文件，deviceName一定要与触摸屏设备名称一致，不然会找不到指定的sys文件。

4.sys文件系统

前面讲到了readVirtualKeys会读取sys文件，这个sys文件就是定义虚拟按键的坐标以及键值，它的协议格式是一段字符串，每个按键有六项分别用冒号分割，按键按键之间也是用冒号分割，标准格式是：

键类型:键值:按键区域中心x坐标:按键区域中心y坐标:按键区域宽:按键区域高

加载触摸屏以及创建sys文件的代码：

#ifdef VIRTUAL_KEYS

static ssize_t virtual_keys_show(struct kobject *kobj,

struct kobj_attribute *attr, char *buf)

{

if (1) {

return sprintf(buf,

__stringify(EV_KEY) ":" __stringify(KEY_VOLUMEUP) ":1030:370:30:30"

":" __stringify(EV_KEY) ":" __stringify(KEY_VOLUMEDOWN) ":1030:470:30:30"

":" __stringify(EV_KEY) ":" __stringify(KEY_BACK) ":1030:18:30:30"

":" __stringify(EV_KEY) ":" __stringify(KEY_HOME) ":1030:136:30:30"

":" __stringify(EV_KEY) ":" __stringify(KEY_MENU) ":1030:236:30:30"

"\n");

} else {

}

}

static struct kobj_attribute virtual_keys_attr = {

.attr = {

.name = "virtualkeys.xxxx",

.mode = S_IRUGO,

},

.show = &virtual_keys_show,

};

static struct attribute *properties_attrs[] = {

&virtual_keys_attr.attr,

NULL

};

static struct attribute_group properties_attr_group = {

.attrs = properties_attrs,

};

static void virtual_keys_init(void)

{

int ret;

struct kobject *properties_kobj;

properties_kobj = kobject_create_and_add("board_properties", NULL);

if (properties_kobj)

ret = sysfs_create_group(properties_kobj,

&properties_attr_group);

if (!properties_kobj || ret)

pr_err("failed to create board_properties\n");

}
#endif

其中.name = "virtualkeys.xxxx"的xxxx就是触摸屏设备名称，也就是前面说到的{deviceName}，virtual_keys_init()函数可以在触摸屏probe函数中调用。另外，我将可视区域左侧的两侧按键移到了右侧实现，因此五个按键区域中心x坐标都是一样，这部分要在触摸屏驱动增加x轴坐标调整，这部分我就不再说明。以上步骤完成后可以使用 cat
/sys/board_properties/virtualkeys.{deviceName}查看虚拟按键的配置文件，并试试按下触摸屏上按键是否有反应，如果坐标不正确还要进行耐心地校准。

具体的可以去HTC网站(http://htcdev.com/devcenter/downloads)上下载HTC手机的linux源码，HTC很多款手机的BACK,MENU,HOME,SEARCH电容屏虚拟按键都是采用这种方式实现的。

（三）但是我用的是四线电阻触摸屏，用上面的方式好像没有任何反应，所以我采用最直接的方式用input_event发送按键消息，就是在触摸屏处理芯片TSC2007驱动中当读到一定范围内的触摸事件就发送按键消息：这种方式只要修改TSC2007驱动的几个地方：

1.定义全局局部变量用于记录是否有虚拟按键按下

static int backkeydown=0;
static int homekeydown=0;
static int menukeydown=0;

2..在prope函数中添加

set_bit(EV_SYN, input_dev->evbit);
set_bit(KEY_HOME, input_dev->keybit);
//set_bit(KEY_SEARCH, input_dev->keybit);
set_bit(KEY_BACK, input_dev->keybit);
set_bit(KEY_MENU, input_dev->keybit);

3.在中断处理work里面添加按键按下消息

if((tc.y>=81)&&(tc.y<=181))
{
if((tc.x>=2711)&&(tc.x<=2832))
{
if(backkeydown==0)
{
input_event(input, EV_KEY,KEY_BACK, 1);
backkeydown=1;
//printk("back key down\n");
}
}
else if((tc.x>=1891)&&(tc.x<=1933))
{
if(homekeydown==0)
{
input_event(input, EV_KEY,KEY_HOME, 1);
homekeydown=1;
//printk("home key down\n");
}
}
else if((tc.x>=1088)&&(tc.x<=1143))
{
if(menukeydown==0)
{
input_event(input, EV_KEY,KEY_MENU, 1);
menukeydown=1;
//printk("menu key down\n");
}
}
}

4.在tsc2007_send_up_event函数中添加按键释放消息

if(backkeydown==1)
{
backkeydown=0;
input_event(input, EV_KEY, KEY_BACK, 0);
//printk("back key up\n");
}
if(homekeydown==1)
{
homekeydown=0;
input_event(input, EV_KEY, KEY_HOME, 0);
//printk("home key up\n");
}
if(menukeydown==1)
{
menukeydown=0;
input_event(input, EV_KEY, KEY_MENU, 0);
//printk("menu key up\n");
}

整个修改后的TSC2007驱动如下：

/*
* drivers/input/touchscreen/tsc2007.c
*
* Copyright (c) 2008 MtekVision Co., Ltd.
*	Kwangwoo Lee <kwlee@mtekvision.com>
*
* Using code from:
*  - ads7846.c
*	Copyright (c) 2005 David Brownell
*	Copyright (c) 2006 Nokia Corporation
*  - corgi_ts.c
*	Copyright (C) 2004-2005 Richard Purdie
*  - omap_ts.[hc], ads7846.h, ts_osk.c
*	Copyright (C) 2002 MontaVista Software
*	Copyright (C) 2004 Texas Instruments
*	Copyright (C) 2005 Dirk Behme
*
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License version 2 as
*  published by the Free Software Foundation.
*/

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/i2c/tsc2007.h>

#define TS_POLL_DELAY			1 /* ms delay between samples */
#define TS_POLL_PERIOD			1 /* ms delay between samples */

#define TSC2007_MEASURE_TEMP0		(0x0 << 4)
#define TSC2007_MEASURE_AUX		(0x2 << 4)
#define TSC2007_MEASURE_TEMP1		(0x4 << 4)
#define TSC2007_ACTIVATE_XN		(0x8 << 4)
#define TSC2007_ACTIVATE_YN		(0x9 << 4)
#define TSC2007_ACTIVATE_YP_XN		(0xa << 4)
#define TSC2007_SETUP			(0xb << 4)
#define TSC2007_MEASURE_X		(0xc << 4)
#define TSC2007_MEASURE_Y		(0xd << 4)
#define TSC2007_MEASURE_Z1		(0xe << 4)
#define TSC2007_MEASURE_Z2		(0xf << 4)

#define TSC2007_POWER_OFF_IRQ_EN	(0x0 << 2)
#define TSC2007_ADC_ON_IRQ_DIS0		(0x1 << 2)
#define TSC2007_ADC_OFF_IRQ_EN		(0x2 << 2)
#define TSC2007_ADC_ON_IRQ_DIS1		(0x3 << 2)

#define TSC2007_12BIT			(0x0 << 1)
#define TSC2007_8BIT			(0x1 << 1)

#define	MAX_12BIT			((1 << 12) - 1)

#define ADC_ON_12BIT	(TSC2007_12BIT | TSC2007_ADC_ON_IRQ_DIS0)

#define READ_Y		(ADC_ON_12BIT | TSC2007_MEASURE_Y)
#define READ_Z1		(ADC_ON_12BIT | TSC2007_MEASURE_Z1)
#define READ_Z2		(ADC_ON_12BIT | TSC2007_MEASURE_Z2)
#define READ_X		(ADC_ON_12BIT | TSC2007_MEASURE_X)
#define PWRDOWN		(TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN)

static int backkeydown=0;
static int homekeydown=0;
static int menukeydown=0;
struct ts_event {
u16	x;
u16	y;
u16	z1, z2;
};

struct tsc2007 {
struct input_dev	*input;
char			phys[32];
struct delayed_work	work;

struct i2c_client	*client;

u16			model;
u16			x_plate_ohms;

bool			pendown;
int			irq;

int			(*get_pendown_state)(void);
void			(*clear_penirq)(void);
};

static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
{
s32 data;
u16 val;

data = i2c_smbus_read_word_data(tsc->client, cmd);
if (data < 0) {
dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
return data;
}

/* The protocol and raw data format from i2c interface:
* S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
* Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit].
*/
val = swab16(data) >> 4;

dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);

return val;
}

static void tsc2007_read_values(struct tsc2007 *tsc, struct ts_event *tc)
{
/* y- still on; turn on only y+ (and ADC) */
tc->y = tsc2007_xfer(tsc, READ_Y);

/* turn y- off, x+ on, then leave in lowpower */
tc->x = tsc2007_xfer(tsc, READ_X);

/* turn y+ off, x- on; we'll use formula #1 */
tc->z1 = tsc2007_xfer(tsc, READ_Z1);
tc->z2 = tsc2007_xfer(tsc, READ_Z2);
//printk("x=%d,y=%d\n",tc->x,tc->y);
/* Prepare for next touch reading - power down ADC, enable PENIRQ */
tsc2007_xfer(tsc, PWRDOWN);
}

static u32 tsc2007_calculate_pressure(struct tsc2007 *tsc, struct ts_event *tc)
{
u32 rt = 0;

/* range filtering */
if (tc->x == MAX_12BIT)
tc->x = 0;

if (likely(tc->x && tc->z1)) {
/* compute touch pressure resistance using equation #1 */
rt = tc->z2 - tc->z1;
rt *= tc->x;
rt *= tsc->x_plate_ohms;
rt /= tc->z1;
rt = (rt + 2047) >> 12;
}

return rt;
}

static void tsc2007_send_up_event(struct tsc2007 *tsc)
{
struct input_dev *input = tsc->input;

dev_dbg(&tsc->client->dev, "UP\n");
if(backkeydown==1)
{
backkeydown=0;
input_event(input, EV_KEY, KEY_BACK, 0);
//printk("back key up\n");
}
if(homekeydown==1)
{
homekeydown=0;
input_event(input, EV_KEY, KEY_HOME, 0);
//printk("home key up\n");
}
if(menukeydown==1)
{
menukeydown=0;
input_event(input, EV_KEY, KEY_MENU, 0);
//printk("menu key up\n");
}
input_report_key(input, BTN_TOUCH, 0);
input_report_abs(input, ABS_PRESSURE, 0);
input_sync(input);
}

static void tsc2007_work(struct work_struct *work)
{
struct tsc2007 *ts =
container_of(to_delayed_work(work), struct tsc2007, work);
struct ts_event tc;
u32 rt;

/*
* NOTE: We can't rely on the pressure to determine the pen down
* state, even though this controller has a pressure sensor.
* The pressure value can fluctuate for quite a while after
* lifting the pen and in some cases may not even settle at the
* expected value.
*
* The only safe way to check for the pen up condition is in the
* work function by reading the pen signal state (it's a GPIO
* and IRQ). Unfortunately such callback is not always available,
* in that case we have rely on the pressure anyway.
*/
if (ts->get_pendown_state) {
if (unlikely(!ts->get_pendown_state())) {
tsc2007_send_up_event(ts);
ts->pendown = false;
goto out;
}

dev_dbg(&ts->client->dev, "pen is still down\n");
}

tsc2007_read_values(ts, &tc);

rt = tsc2007_calculate_pressure(ts, &tc);
if (rt > MAX_12BIT) {
/*
* Sample found inconsistent by debouncing or pressure is
* beyond the maximum. Don't report it to user space,
* repeat at least once more the measurement.
*/
dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
goto out;

}

if (rt) {
struct input_dev *input = ts->input;
if((tc.y>=81)&&(tc.y<=181))
{
if((tc.x>=2711)&&(tc.x<=2832))
{
if(backkeydown==0)
{
input_event(input, EV_KEY,KEY_BACK, 1);
backkeydown=1;
//printk("back key down\n");
}
}
else if((tc.x>=1891)&&(tc.x<=1933))
{
if(homekeydown==0)
{
input_event(input, EV_KEY,KEY_HOME, 1);
homekeydown=1;
//printk("home key down\n");
}
}
else if((tc.x>=1088)&&(tc.x<=1143))
{
if(menukeydown==0)
{
input_event(input, EV_KEY,KEY_MENU, 1);
menukeydown=1;
//printk("menu key down\n");
}
}
}
if (!ts->pendown) {
dev_dbg(&ts->client->dev, "DOWN\n");

input_report_key(input, BTN_TOUCH, 1);
ts->pendown = true;
}

input_report_abs(input, ABS_X, tc.x);
input_report_abs(input, ABS_Y, tc.y);
input_report_abs(input, ABS_PRESSURE, rt);

input_sync(input);

dev_dbg(&ts->client->dev, "point(%4d,%4d), pressure (%4u)\n",
tc.x, tc.y, rt);

} else if (!ts->get_pendown_state && ts->pendown) {
/*
* We don't have callback to check pendown state, so we
* have to assume that since pressure reported is 0 the
* pen was lifted up.
*/
tsc2007_send_up_event(ts);
ts->pendown = false;
}

out:
if (ts->pendown)
schedule_delayed_work(&ts->work,
msecs_to_jiffies(TS_POLL_PERIOD));
else
enable_irq(ts->irq);
}

static irqreturn_t tsc2007_irq(int irq, void *handle)
{
struct tsc2007 *ts = handle;

if (!ts->get_pendown_state || likely(ts->get_pendown_state())) {
disable_irq_nosync(ts->irq);
schedule_delayed_work(&ts->work,
msecs_to_jiffies(TS_POLL_DELAY));
}

if (ts->clear_penirq)
ts->clear_penirq();

return IRQ_HANDLED;
}

static void tsc2007_free_irq(struct tsc2007 *ts)
{
free_irq(ts->irq, ts);
if (cancel_delayed_work_sync(&ts->work)) {
/*
* Work was pending, therefore we need to enable
* IRQ here to balance the disable_irq() done in the
* interrupt handler.
*/
enable_irq(ts->irq);
}
}

static int __devinit tsc2007_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tsc2007 *ts;
struct tsc2007_platform_data *pdata = pdata = client->dev.platform_data;
struct input_dev *input_dev;
int err;

if (!pdata) {
dev_err(&client->dev, "platform data is required!\n");
return -EINVAL;
}

if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_WORD_DATA))
return -EIO;

ts = kzalloc(sizeof(struct tsc2007), GFP_KERNEL);
input_dev = input_allocate_device();
if (!ts || !input_dev) {
err = -ENOMEM;
goto err_free_mem;
}

ts->client = client;
ts->irq = client->irq;
ts->input = input_dev;
INIT_DELAYED_WORK(&ts->work, tsc2007_work);

ts->model             = pdata->model;
ts->x_plate_ohms      = pdata->x_plate_ohms;
ts->get_pendown_state = pdata->get_pendown_state;
ts->clear_penirq      = pdata->clear_penirq;

snprintf(ts->phys, sizeof(ts->phys),
"%s/input0", dev_name(&client->dev));

input_dev->name = "TSC2007";
input_dev->phys = ts->phys;
input_dev->id.vendor = 0x0001;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
input_dev->id.bustype = BUS_I2C;

input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
set_bit(EV_SYN, input_dev->evbit);
set_bit(KEY_HOME, input_dev->keybit);
//set_bit(KEY_SEARCH, input_dev->keybit);
set_bit(KEY_BACK, input_dev->keybit);
set_bit(KEY_MENU, input_dev->keybit);
input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0);

if (pdata->init_platform_hw)
pdata->init_platform_hw();

err = request_irq(ts->irq, tsc2007_irq, 0,
client->dev.driver->name, ts);
if (err < 0) {
dev_err(&client->dev, "irq %d busy?\n", ts->irq);
goto err_free_mem;
}

/* Prepare for touch readings - power down ADC and enable PENIRQ */
err = tsc2007_xfer(ts, PWRDOWN);
if (err < 0)
goto err_free_irq;

err = input_register_device(input_dev);
if (err)
goto err_free_irq;

i2c_set_clientdata(client, ts);

return 0;

err_free_irq:
tsc2007_free_irq(ts);
if (pdata->exit_platform_hw)
pdata->exit_platform_hw();
err_free_mem:
input_free_device(input_dev);
kfree(ts);
return err;
}

static int __devexit tsc2007_remove(struct i2c_client *client)
{
struct tsc2007	*ts = i2c_get_clientdata(client);
struct tsc2007_platform_data *pdata = client->dev.platform_data;

tsc2007_free_irq(ts);

if (pdata->exit_platform_hw)
pdata->exit_platform_hw();

input_unregister_device(ts->input);
kfree(ts);

return 0;
}

static struct i2c_device_id tsc2007_idtable[] = {
{ "tsc2007", 0 },
{ }
};

MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);

static struct i2c_driver tsc2007_driver = {
.driver = {
.owner	= THIS_MODULE,
.name	= "tsc2007"
},
.id_table	= tsc2007_idtable,
.probe		= tsc2007_probe,
.remove		= __devexit_p(tsc2007_remove),
};

static int __init tsc2007_init(void)
{
return i2c_add_driver(&tsc2007_driver);
}

static void __exit tsc2007_exit(void)
{
i2c_del_driver(&tsc2007_driver);
}

module_init(tsc2007_init);
module_exit(tsc2007_exit);

MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
MODULE_LICENSE("GPL");

实践证明上述方式完全可行，这里我没有指定TSC2007的kl和kcm文件，android系统会自动选择默认的\android\sdk\emulator\keymaps\目录下的qwerty.kl和qwerty.kcm文件,如果你的系统不能正常收到按键消息，你首先可以用android的getevent看看驱动是否能正常发送按键消息给上层，如果能正常收到触摸屏驱动发送的按键消息，上层android系统不能收到的原因就是kl和kcm文件不对。
5.另外附上加载TSC2007驱动的代码

/* TouchScreen */
#define IRQ1 1
unsigned int tsc2007_int;
unsigned int tsc2007_irq_no;
static int ts_get_pendown_state(void)
{
int result=!(imapx_gpio_getpin(tsc2007_int, IG_NORMAL));
//printk("%d\n",result);
return result;
}
static int ts_init(void)
{

//printk("====ts_init===\n");
tsc2007_int  = __imapx_name_to_gpio(CONFIG_TP_TSC2007_INT);
if(tsc2007_int == IMAPX_GPIO_ERROR) {
printk(KERN_ERR "failed to get tsc2007_int pin.\n");
return -1;
}
tsc2007_irq_no = imapx_gpio_to_irq(tsc2007_int);
imapx_gpio_setcfg(tsc2007_int, IG_INPUT, IG_NORMAL);
imapx_gpio_setirq(tsc2007_int, FILTER_MAX, IG_FALL, 1);
return 0;
}
struct tsc2007_platform_data tsc2007_info = {
.model			= 2007,
.x_plate_ohms		= 180,
.get_pendown_state	= ts_get_pendown_state,
.init_platform_hw	= ts_init,
};
static struct i2c_board_info ts_i2c_clients = {
I2C_BOARD_INFO("tsc2007", 0x48),
.type		= "tsc2007",
.platform_data	= &tsc2007_info,
.irq		= IRQ1,
};
static int __init imap_arch_init(void)
{
int ret;

// do the correct init for cpu

if (cpu == NULL)
panic("imap_arch_init: NULL cpu\n");

ret = (cpu->init)();
if (ret != 0)
return ret;

ret = platform_add_devices(imap_uart_devs, nr_uarts);
if (ret != 0)
return ret;
/*瑙︽懜灞?/
i2c_register_board_info(1, &ts_i2c_clients, 1);
/*瑙︽懜灞忚櫄鎷熸寜閿?/
//virtual_keys_init();
printk(KERN_INFO "leaving imap_arch_init\n");
return ret;
}

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