[置顶] linux-3.6.6按键驱动移植
//--------------------------------------------------------------------------------------------
// 作者：longtian635241（[email protected]）
// 论坛ID：idea6410
// 版权：idea6410
// 平台：友坚idea6410开发板
// 发布日期：2012-11-22
// 最后修改：2012-11-22
//http://www.urbetter.com/main.asp
//----------------------------------------------------------------------------------------------
gpio按键驱动移植
-
Linux内核下的drivers/input/keyboard/gpio_keys.c 实现了一个体系结构无关的 GPIO 按键驱动,使用此按键驱动,开发者不需要修改很多代码，只需要在BSP 的板文件（对于 smdk6410为arch/arm/mach-s3c6410/mach-smdk6410.c）中定义相关的platform 设备和数据。在 idea6410开发板上,用 GPN0~GPN5实现了DOWN、ENTER、HOME、UP、TAB、END 六个按键，因此其对应的 platform 信息如下：
/* gpio buttons */
static struct gpio_keys_button gpio_buttons[] = {
{
.gpio = S3C64XX_GPN(0),
//.code = 25,
.code = KEY_UP,
.desc = "BUTTON1",
.active_low = 1,
.wakeup = 0,
},
{
.gpio = S3C64XX_GPN(1),
//.code = 42,
.code = KEY_LEFT,
.desc = "BUTTON2",
.active_low = 1,
.wakeup = 0,
},
{
.gpio = S3C64XX_GPN(2),
//.code = 50,
.code = KEY_RIGHT,
.desc = "BUTTON3",
.active_low = 1,
.wakeup = 0,
},
{
.gpio = S3C64XX_GPN(3),
//.code = 10,
.code = KEY_DOWN,
.desc = "BUTTON4",
.active_low = 1,
.wakeup = 0,
},
{
.gpio = S3C64XX_GPN(4),
//.code = 24,
.code = KEY_ESC,
.desc = "BUTTON5",
.active_low = 1,
.wakeup = 0,
},
{
.gpio = S3C64XX_GPN(5),
//.code = 38,
.code = KEY_ENTER,
.desc = "BUTTON6",
.active_low = 1,
.wakeup = 0,
}
};
static struct gpio_keys_platform_data gpio_button_data = {
.buttons = gpio_buttons,
.nbuttons = ARRAY_SIZE(gpio_buttons),
};
static struct platform_device gpio_button_device = {
.name = "gpio-keys",
.id = -1,
.num_resources = 0,
.dev = {
.platform_data = &gpio_button_data,
}
};
idea6410的GIPO-KEYS，也就是单板上面的6个按键功能的实现：
需要添加头文件：
#include <linux/gpio_keys.h>，（默认已有）
#include <linux/input.h>
Device Drivers --->
Input device support --->
[*] Keyboards --->
<*> GPIO Buttons
编译通过可测试没有反应，查看串口信息显示：
gpio-keys gpio-keys: Failed to request GPIO 149, error -16
gpio-keys: probe of gpio-keys failed with error -16
修改：drivers/input/keyboard/gpio_keys.c
error = gpio_request(button->gpio, desc);
if (error < 0) {
dev_err(dev, "Failed to request GPIO %d, error %d\n",
button->gpio, error);
return error;
}
修改为：
error = gpio_request(button->gpio, desc);
//add by hcm
// if (error < 0) {
if (error > 0) {
dev_err(dev, "Failed to request GPIO %d, error %d\n",
button->gpio, error);
return error;
}
第二种方法：
1、从友坚的urbetter-linux2.6.28-v1.0/drivers/input/keyboard下将s3c-button.c拷贝到Y:\linux-3.6.6\drivers\input\keyboard下面
2、修改Y:\linux-3.6.6\drivers\input\keyboard\Kconfig，在最后一行endif前加入：
#add by chm
config KEYBOARD_S3C_BUTTON
tristate "S3C Buttons"
depends on GENERIC_GPIO
help
This driver implements support for buttons connected
to GPIO pins of various CPUs.
To compile this driver as a module, choose M here: the
module will be called.
3、修改Y:\linux-3.6.6\drivers\input\keyboard\Makefile在最后加入：
#add by hcm
obj-$(CONFIG_KEYBOARD_S3C_BUTTON) += s3c-button.o
4、make menuconfig
Device Drivers --->
Input device support --->
[*] Keyboards --->
<*> S3C Buttons
5、编译即可！
驱动下载地址：http://download.csdn.net/detail/longtian635241/4797626