mb9260_kbd.c

一个总线扩展的嵌入式Linux键盘驱动程序。

/*
 *  Keyboard driver for moblle9260.
 *
 *  Copyright (c) 2008 liulf, [e-mail]
 *  Based on aaed2000_kbd.c.
 *
 *
 *  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/delay.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/input-polldev.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <linux/wfos_debug.h>
#include <linux/wfos_iomem.h>

#include <mach/hardware.h>

#define NR_SCANCODES		(128)
#define SCAN_INTERVAL		(50) /* ms */

#define KEYBOARD_PHY_BASE0		0x30000040      /* key1 ~ key16 */
#define KEYBOARD_PHY_BASE1		0x30000060      /* key17 ~ key32 */

#if 0
static unsigned char KEY0_MAP[1] = {
	KEY_0,
};

static unsigned char KEY1_MAP[1] = {
	KEY_1,
};

static unsigned char KEY2_MAP[4] = {
	KEY_2, KEY_A, KEY_B, KEY_C,
};

static unsigned char KEY3_MAP[4] = {
	KEY_3, KEY_D, KEY_E, KEY_F,
};

static unsigned char KEY4_MAP[4] = {
	KEY_4, KEY_G, KEY_H, KEY_I,
};

static unsigned char KEY5_MAP[4] = {
	KEY_5, KEY_J, KEY_K, KEY_L,
};

static unsigned char KEY6_MAP[4] = {
	KEY_6, KEY_M, KEY_N, KEY_O,
};

static unsigned char KEY7_MAP[5] = {
	KEY_7, KEY_P, KEY_Q, KEY_R, KEY_S,
};

static unsigned char KEY8_MAP[4] = {
	KEY_8, KEY_T, KEY_U, KEY_V,
};

static unsigned char KEY9_MAP[5] = {
	KEY_W, KEY_X, KEY_Y, KEY_Z,
};
#endif

enum KEY_IDX {
	IDX_FUNC = 0,
	IDX_BACK,
	IDX_UP,
	IDX_FN,
	IDX_ENTER,
	IDX_DEL,
	IDX_LEFT,
	IDX_ENTER2,
	IDX_RIGHT,
	IDX_PLUS,
	IDX_DOWN,
	IDX_STAR,      /* * */
	IDX_3DEF,       /* 3/D/E/F */
	IDX_2ABC,       /* 2/A/B/C */
	IDX_1,          /* 1 */
	IDX_0,          /* 0 */
	IDX_POUND,      /* # */
	IDX_6MNO,       /* 6/M/N/O */
	IDX_9WXYZ,      /* 9/W/X/Y/Z */
	IDX_5JKL,       /* 5/J/K/L */
	IDX_8TUV,       /* 8/T/U/V */
	IDX_4GHI,       /* 8/G/H/I */
	IDX_7PQRS,      /* 7/P/Q/R/S */
};

static unsigned int mb9260kbd_keycode[NR_SCANCODES] = {
	[IDX_FUNC] = KEY_MENU,
	[IDX_BACK] = KEY_BACK,
	[IDX_UP] = KEY_UP,
	[IDX_FN] = KEY_FN,
	[IDX_ENTER] = KEY_ENTER,
	[IDX_DEL] = KEY_DELETE,
	[IDX_LEFT] = KEY_LEFT,

	/* FIX ME! */
	[IDX_ENTER2] = KEY_BACK,

	[IDX_RIGHT] = KEY_RIGHT,
	[IDX_PLUS] = KEY_KPPLUS,
	[IDX_DOWN] = KEY_DOWN,

	/* comobo key */
	[IDX_STAR] = 0,

	[IDX_3DEF] = KEY_3,
	[IDX_2ABC] = KEY_2,
	[IDX_1] = KEY_1,
	[IDX_0] = KEY_0,

	/* comobo key */
	[IDX_POUND] = 0,

	[IDX_6MNO] = KEY_6,
	[IDX_9WXYZ] = KEY_9,
	[IDX_5JKL] = KEY_5,
	[IDX_8TUV] = KEY_8,
	[IDX_4GHI] = KEY_4,
	[IDX_7PQRS] = KEY_7,
};

struct mb9260kbd {
	unsigned char keycode[ARRAY_SIZE(mb9260kbd_keycode)];
	struct input_polled_dev *poll_dev;
	struct iomem_object *iomem0;		  
	struct iomem_object *iomem1;		  
	unsigned long key_ever_pressed;
	unsigned long kbdscan_state;
	unsigned int kbdscan_count[32];
};

#define KBDSCAN_STABLE_COUNT 2

static inline u32 mb9260kbd_getkey(struct mb9260kbd *dev)
{
	u16 key0 = 0xffff, key1 = 0xffff;
	struct iomem_object *iomem0 = dev->iomem0;		  
	struct iomem_object *iomem1 = dev->iomem1;	

	iomem0->read_word(iomem0, &key0, IO_RDONLY);
	iomem1->read_word(iomem1, &key1, IO_RDONLY);
	key1 |= 0xff00; 

	return (key0 | (key1 << 16));
}

static void mb9260kbd_report_key(struct mb9260kbd *mb9260kbd, unsigned long key_stat, unsigned int idx)
{
	unsigned int pressed;

	if (unlikely(idx >= ARRAY_SIZE(mb9260kbd_keycode))) {
		return;
	}

	pressed = !test_bit(idx, &key_stat);

	switch (idx) {
		case  IDX_STAR: /* Key *:  SHIFT + 8 */
			input_report_key(mb9260kbd->poll_dev->input,
					 KEY_LEFTSHIFT, pressed);
			input_report_key(mb9260kbd->poll_dev->input,
					 KEY_8, pressed);
			break;

		case  IDX_POUND: /* Key #: SHIFT + 3 */
			input_report_key(mb9260kbd->poll_dev->input,
					 KEY_LEFTSHIFT, pressed);
			input_report_key(mb9260kbd->poll_dev->input,
					 KEY_3, pressed);
			break;

		default:
			input_report_key(mb9260kbd->poll_dev->input,
					 mb9260kbd->keycode[idx], pressed);
			break;

	}

	return;
}


/* Scan the hardware keyboard and push any changes up through the input layer */
static void mb9260kbd_poll(struct input_polled_dev *dev)
{
	struct mb9260kbd *mb9260kbd = dev->private;
	unsigned long key_stat = 0xffffffff;
	unsigned long idx = 0;
	int sync = 0;

	key_stat = mb9260kbd_getkey(mb9260kbd);
	if ((mb9260kbd->key_ever_pressed = 0) 
		&& (key_stat == 0xffffffff)
		&& (mb9260kbd->kbdscan_state == key_stat)) {
	        return;
    }

	for (idx = IDX_FUNC; idx <= IDX_7PQRS; idx++) {
		if (test_bit(idx, &key_stat) 
				^ test_bit(idx, &mb9260kbd->kbdscan_state)) {
			set_bit(idx, &mb9260kbd->key_ever_pressed);
			mb9260kbd->kbdscan_count[idx] = 0;
			mb9260kbd->kbdscan_state = key_stat;
		} else if (++mb9260kbd->kbdscan_count[idx] >= KBDSCAN_STABLE_COUNT) {
			if (test_and_clear_bit(idx, &mb9260kbd->key_ever_pressed)) {
				mb9260kbd_report_key(mb9260kbd, key_stat, idx);
				sync = 1;
			}

			mb9260kbd->kbdscan_count[idx] = 0;
		}
	}

	if (sync) {
		input_sync(dev->input);
	}

	return;
}

static int __devinit mb9260kbd_probe(struct platform_device *pdev)
{
	struct mb9260kbd *mb9260kbd;
	struct input_polled_dev *poll_dev;
	struct input_dev *input_dev;
	int i;
	int error;

	mb9260kbd = kzalloc(sizeof(struct mb9260kbd), GFP_KERNEL);
	if (!mb9260kbd) {
		error = -ENOMEM;
		goto mb9260kbd_malloc_fail;
	}

	mb9260kbd->kbdscan_state = 0xffffffff;

	mb9260kbd->iomem0 = iomem_object_get(KEYBOARD_PHY_BASE0, 0xffffffff);
	if (!mb9260kbd->iomem0) {
		printk(KERN_ERR "Can NOT remap address 0x%08x\n", KEYBOARD_PHY_BASE0);
		error = -1;
		goto iomem0_fail;
	}

	mb9260kbd->iomem1 = iomem_object_get(KEYBOARD_PHY_BASE1, 0xffffffff);
	if (!mb9260kbd->iomem1) {
		printk(KERN_ERR "Can NOT remap address 0x%08x\n", KEYBOARD_PHY_BASE1);
		error = -1;
		goto iomem1_fail;
	}


	poll_dev = input_allocate_polled_device();
	if (!mb9260kbd || !poll_dev) {
		error = -ENOMEM;
		goto fail;
	}

	platform_set_drvdata(pdev, mb9260kbd);

	mb9260kbd->poll_dev = poll_dev;
	memcpy(mb9260kbd->keycode, mb9260kbd_keycode, sizeof(mb9260kbd->keycode));

	poll_dev->private = mb9260kbd;
	poll_dev->poll = mb9260kbd_poll;
	poll_dev->poll_interval = SCAN_INTERVAL;

	input_dev = poll_dev->input;
	input_dev->name = "Mobile9260 Keyboard";
	input_dev->phys = "mb9260kbd/input0";
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
	input_dev->dev.parent = &pdev->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
	input_dev->keycode = mb9260kbd->keycode;
	input_dev->keycodesize = sizeof(unsigned char);
	input_dev->keycodemax = ARRAY_SIZE(mb9260kbd_keycode);

	for (i = 0; i < ARRAY_SIZE(mb9260kbd_keycode); i++)
		set_bit(mb9260kbd->keycode[i], input_dev->keybit);
	clear_bit(0, input_dev->keybit);

	error = input_register_polled_device(mb9260kbd->poll_dev);
	if (error)
		goto fail;

	return 0;

fail:	
	input_free_polled_device(poll_dev);
	iomem_object_put(mb9260kbd->iomem1);

iomem1_fail:
	iomem_object_put(mb9260kbd->iomem0);

iomem0_fail:
	kfree(mb9260kbd);

mb9260kbd_malloc_fail:
	return error;
}

static int __devexit mb9260kbd_remove(struct platform_device *pdev)
{
	struct mb9260kbd *mb9260kbd = platform_get_drvdata(pdev);

	input_unregister_polled_device(mb9260kbd->poll_dev);
	input_free_polled_device(mb9260kbd->poll_dev);

	iomem_object_put(mb9260kbd->iomem1);
	iomem_object_put(mb9260kbd->iomem0);
	kfree(mb9260kbd);

	return 0;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:mb9260-keyboard");

static struct platform_driver mb9260kbd_driver = {
	.probe		= mb9260kbd_probe,
	.remove		= __devexit_p(mb9260kbd_remove),
	.driver		= {
		.name	= "mb9260-kbd",
		.owner	= THIS_MODULE,
	},
};

static int __init mb9260kbd_init(void)
{
	return platform_driver_register(&mb9260kbd_driver);
}

static void __exit mb9260kbd_exit(void)
{
	platform_driver_unregister(&mb9260kbd_driver);
}

module_init(mb9260kbd_init);
module_exit(mb9260kbd_exit);

MODULE_AUTHOR("liulf");
MODULE_DESCRIPTION("Mobile9260 Keyboard Driver");
MODULE_LICENSE("GPL v2");