android系统PS2全键盘驱动(上)-使用linux的标准接口实现

    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：

KEY	MAKE	BREAK	KEY	MAKE	BREAK	KEY	MAKE	BREAK
A	1C	F0,1C	9	46	F0,46	[	54	F0,54
B	32	F0,32	`	0E	F0,0E	INSERT	E0,70	E0,F0,70
C	21	F0,21	-	4E	F0,4E	HOME	E0,6C	E0,F0,6C
D	23	F0,23	=	55	F0,55	PG UP	E0,7D	E0,F0,7D
E	24	F0,24	\	5D	F0,5D	DELETE	E0,71	E0,F0,71
F	2B	F0,2B	BKSP	66	F0,66	END	E0,69	E0,F0,69
G	34	F0,34	SPACE	29	F0,29	PG DN	E0,7A	E0,F0,7A
H	33	F0,33	TAB	0D	F0,0D	U ARROW	E0,75	E0,F0,75
I	43	F0,43	CAPS	58	F0,58	L ARROW	E0,6B	E0,F0,6B
J	3B	F0,3B	L SHFT	12	F0,12	D ARROW	E0,72	E0,F0,72
K	42	F0,42	L CTRL	14	F0,14	R ARROW	E0,74	E0,F0,74
L	4B	F0,4B	L GUI	E0,1F	E0,F0,1F	NUM	77	F0,77
M	3A	F0,3A	L ALT	11	F0,11	KP /	E0,4A	E0,F0,4A
N	31	F0,31	R SHFT	59	F0,59	KP *	7C	F0,7C
O	44	F0,44	R CTRL	E0,14	E0,F0,14	KP -	7B	F0,7B
P	4D	F0,4D	R GUI	E0,27	E0,F0,27	KP +	79	F0,79
Q	15	F0,15	R ALT	E0,11	E0,F0,11	KP EN	E0,5A	E0,F0,5A
R	2D	F0,2D	APPS	E0,2F	E0,F0,2F	KP .	71	F0,71
S	1B	F0,1B	ENTER	5A	F0,5A	KP 0	70	F0,70
T	2C	F0,2C	ESC	76	F0,76	KP 1	69	F0,69
U	3C	F0,3C	F1	05	F0,05	KP 2	72	F0,72
V	2A	F0,2A	F2	06	F0,06	KP 3	7A	F0,7A
W	1D	F0,1D	F3	04	F0,04	KP 4	6B	F0,6B
X	22	F0,22	F4	0C	F0,0C	KP 5	73	F0,73
Y	35	F0,35	F5	03	F0,03	KP 6	74	F0,74
Z	1A	F0,1A	F6	0B	F0,0B	KP 7	6C	F0,6C
0	45	F0,45	F7	83	F0,83	KP 8	75	F0,75
1	16	F0,16	F8	0A	F0,0A	KP 9	7D	F0,7D
2	1E	F0,1E	F9	01	F0,01	]	5B	F0,5B
3	26	F0,26	F10	09	F0,09	;	4C	F0,4C
4	25	F0,25	F11	78	F0,78	'	52	F0,52
5	2E	F0,2E	F12	07	F0,07	,	41	F0,41
6	36	F0,36	PRNT SCRN	E0,12, E0,7C	E0,F0,7C, E0,F0,12	.	49	F0,49
7	3D	F0,3D	SCROLL	7E	F0,7E	/	4A	F0,4A
8	3E	F0,3E	PAUSE	E1,14,77,E1F0,14,F0,77	-NONE

 

ACPI扫描码：

Key	Make Code	Break Code
Power	E0,37	E0, F0, 37
Sleep	E0,3F	E0, F0, 3F
Wake	E0,5E	E0, F0, 5E

 

Windows多媒体扫描码：

Key	Make Code	Break Cod
Next Track	E0, 4D	E0, F0, 4D
Previous Track	E0, 15	E0, F0, 15
Stop	E0, 3B	E0, F0, 3B
Play/Pause	E0, 34	E0, F0, 34
Mute	E0, 23	E0, F0, 23
Volume Up	E0, 32	E0, F0, 32
Volume Down	E0, 21	E0, F0, 21
Media Select	E0, 50	E0, F0, 50
E-Mail	E0, 48	E0, F0, 48
Calculator	E0, 2B	E0, F0, 2B
My Computer	E0, 40	E0, F0, 40
WWW Search	E0, 10	E0, F0, 10
WWW Home	E0, 3A	E0, F0, 3A
WWW Back	E0, 38	E0, F0, 38
WWW Forward	E0, 30	E0, F0, 30
WWW Stop	E0, 28	E0, F0, 28
WWW Refresh	E0, 20	E0, F0, 20
WWW Favorites	E0, 18	E0, F0, 18

 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 <[email protected]>");
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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