学步园

    android的设备带全键盘的很少，即使带全键盘的也都是USB HID键盘的居多，我们的设备类似于上网本，需要一个全键盘，但是设备上只有两个USB host口，Wifi用掉一个，剩下的一个USB host被用来做鼠标或者U盘接口用。刚好所用的ARM芯片带的有PS2控制器，所以我们采用PS键盘。linux本身支持PS2协议，如果PS2键盘使用的是标准的第二套键盘扫描码

101 102 和104 键的键盘：

ACPI扫描码：

Windows多媒体扫描码：

 则可以使用linux自带的PS2键盘驱动，由于我的ARM芯片使用的PS2控制器是ARM公司提供的IP核，PS2 控制器的控制寄存器和状态寄存器可以参看ARM网站上的DDI0143.pdf(ARM PrimeCell PS2Keyboard/Mouse Interface (PL050))文档，实际上内核在\kernel\drivers\input\serio\目录下提供了PS2控制器的驱动文件ambakmi.c，没有的话网上也有下载。

/*
 *  linux/drivers/input/serio/ambakmi.c
 *
 *  Copyright (C) 2000-2003 Deep Blue Solutions Ltd.
 *  Copyright (C) 2002 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/amba/bus.h>
#include <linux/amba/kmi.h>
#include <linux/clk.h>
#include <linux/gpio.h>

#include <asm/io.h>
#include <asm/irq.h>

#define KMI_BASE	(kmi->base)

struct amba_kmi_port {
	struct serio		*io;
	struct clk		*clk;
	void __iomem		*base;
	unsigned int		irq;
	unsigned int		divisor;
	unsigned int		open;
};

static irqreturn_t amba_kmi_int(int irq, void *dev_id)
{
	struct amba_kmi_port *kmi = dev_id;
	unsigned int status = readb(KMIIR);
	int handled = IRQ_NONE;

	while (status & KMIIR_RXINTR) {
		serio_interrupt(kmi->io, readb(KMIDATA), 0);
		status = readb(KMIIR);
		handled = IRQ_HANDLED;
	}

	return handled;
}

static int amba_kmi_write(struct serio *io, unsigned char val)
{
	struct amba_kmi_port *kmi = io->port_data;
	unsigned int timeleft = 10000; /* timeout in 100ms */

	while ((readb(KMISTAT) & KMISTAT_TXEMPTY) == 0 && --timeleft)
		udelay(10);

	if (timeleft)
		writeb(val, KMIDATA);

	return timeleft ? 0 : SERIO_TIMEOUT;
}

static int amba_kmi_open(struct serio *io)
{
	struct amba_kmi_port *kmi = io->port_data;
	unsigned int divisor;
	int ret;

	int gpccon;
	
//	ret = clk_enable(kmi->clk);
//	if (ret)
	ret = readb(KMICR);//add by zhaojun
	if (ret & KMICR_EN)//add by zhaojun
		goto out;

//	divisor = clk_get_rate(kmi->clk) / 8000000 - 1;
	divisor = 0xf;//add by zhaojun
	writeb(divisor, KMICLKDIV);
	writeb(KMICR_EN, KMICR);

	// set gpc to pic function add by zhaojun
	imapx_gpio_setcfg(IMAPX_GPC_RANGE(4, 7), IG_CTRL0, IG_NORMAL);

	ret = request_irq(kmi->irq, amba_kmi_int, IRQF_DISABLED, "kmi-pl050", kmi);
	if (ret) {
		printk(KERN_ERR "kmi: failed to claim IRQ%d\n", kmi->irq);
		writeb(0, KMICR);
		goto clk_disable;
	}

	writeb(KMICR_EN | KMICR_RXINTREN, KMICR);

	return 0;

 clk_disable:
	clk_disable(kmi->clk);
 out:
	return ret;
}

static void amba_kmi_close(struct serio *io)
{
	struct amba_kmi_port *kmi = io->port_data;

	writeb(0, KMICR);

	free_irq(kmi->irq, kmi);
	clk_disable(kmi->clk);
}

static int amba_kmi_probe(struct amba_device *dev, struct amba_id *id)
{
	struct amba_kmi_port *kmi;
	struct serio *io;
	int ret;

	ret = amba_request_regions(dev, NULL);
	if (ret)
		return ret;

	kmi = kzalloc(sizeof(struct amba_kmi_port), GFP_KERNEL);
	io = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!kmi || !io) {
		ret = -ENOMEM;
		goto out;
	}


	io->id.type	= SERIO_8042;
	io->write	= amba_kmi_write;
	io->open	= amba_kmi_open;
	io->close	= amba_kmi_close;
	strlcpy(io->name, dev_name(&dev->dev), sizeof(io->name));
	strlcpy(io->phys, dev_name(&dev->dev), sizeof(io->phys));
	io->port_data	= kmi;
	io->dev.parent	= &dev->dev;

	kmi->io 	= io;
	kmi->base	= ioremap(dev->res.start, resource_size(&dev->res));
	if (!kmi->base) {
		ret = -ENOMEM;
		goto out;
	}

//	if (IS_ERR(kmi->clk)) {
//		ret = PTR_ERR(kmi->clk);
//		goto unmap;
//	}

	kmi->irq = dev->irq[0];
	amba_set_drvdata(dev, kmi);

	serio_register_port(kmi->io);
	return 0;

//unmap:
//	iounmap(kmi->base);
 out:
	kfree(kmi);
	kfree(io);
	amba_release_regions(dev);
	return ret;
}

static int amba_kmi_remove(struct amba_device *dev)
{
	struct amba_kmi_port *kmi = amba_get_drvdata(dev);

	amba_set_drvdata(dev, NULL);

	serio_unregister_port(kmi->io);
	clk_put(kmi->clk);
	iounmap(kmi->base);
	kfree(kmi);
	amba_release_regions(dev);
	return 0;
}

static int amba_kmi_resume(struct amba_device *dev)
{
	struct amba_kmi_port *kmi = amba_get_drvdata(dev);

	/* kick the serio layer to rescan this port */
	serio_reconnect(kmi->io);

	return 0;
}

static struct amba_id amba_kmi_idtable[] = {
	{
		.id	= 0x00041050,
		.mask	= 0x000fffff,
	},
	{ 0, 0 }
};

static struct amba_driver ambakmi_driver = {
	.drv		= {
		.name	= "kmi-pl050",
	},
	.id_table	= amba_kmi_idtable,
	.probe		= amba_kmi_probe,
	.remove		= amba_kmi_remove,
	.resume		= amba_kmi_resume,
};

static int __init amba_kmi_init(void)
{
	return amba_driver_register(&ambakmi_driver);
}

static void __exit amba_kmi_exit(void)
{
	amba_driver_unregister(&ambakmi_driver);
}

module_init(amba_kmi_init);
module_exit(amba_kmi_exit);

MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("AMBA KMI controller driver");
MODULE_LICENSE("GPL");

platform资源如下

struct amba_device imap_ps2_device = {
        .dev            = {
                .init_name = "kmi-pl050",
                .coherent_dma_mask = ~0,
        },
        .res            = {
                .start  = 0x20E70000,
                .end    = 0x20E71000,
                .flags  = IORESOURCE_MEM,
        },
        .irq            = { IRQ_PS2_0, NO_IRQ },
        .periphid       = 0x00041050,
};
EXPORT_SYMBOL(imap_ps2_device);

再用platform_add_devices函数在init_machine时加上这个设备即可。

        另外编译时需要选择上

-> Device Drivers                                                                                                                                           
        -> Input device support       

                ->keyboards

                        ->AT keyboard

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