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Commit f9705fcb authored by Nicolas Bellido's avatar Nicolas Bellido Committed by Dmitry Torokhov
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Input: add driver for keyboard on AAED-2000 development board (ARM) 



The keyboard is connected via GPIOs to the processor, and scanned
using a column sample register. The hardware provides no debouncing
mechanism, so the state of the keys is read KBDSCAN_STABLE_COUNT
times before being reported to the input layer.

The status of the keys needs to be polled because there is no
interrupt hooked to the lines. A workqueue is used for this.

Signed-off-by: default avatarNicolas Bellido Y Ortega <ml@acolin.be>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 153a9df0

drivers/input/keyboard/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -203,4 +203,15 @@ config KEYBOARD_OMAP 
	  To compile this driver as a module, choose M here: the

	  module will be called omap-keypad.



config KEYBOARD_AAED2000

	tristate "AAED-2000 keyboard"

	depends on MACH_AAED2000

	default y

	help

	  Say Y here to enable the keyboard on the Agilent AAED-2000

	  development board.



	  To compile this driver as a module, choose M here: the

	  module will be called aaed2000_kbd.



endif

drivers/input/keyboard/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -17,4 +17,5 @@ obj-$(CONFIG_KEYBOARD_SPITZ) += spitzkbd.o 
obj-$(CONFIG_KEYBOARD_HIL)		+= hil_kbd.o

obj-$(CONFIG_KEYBOARD_HIL_OLD)		+= hilkbd.o

obj-$(CONFIG_KEYBOARD_OMAP)             += omap-keypad.o

obj-$(CONFIG_KEYBOARD_AAED2000)         += aaed2000_kbd.o

drivers/input/keyboard/aaed2000_kbd.c

0 → 100644
+203 −0
Original line number Diff line number Diff line 
/*

 *  Keyboard driver for the AAED-2000 dev board

 *

 *  Copyright (c) 2006 Nicolas Bellido Y Ortega

 *

 *  Based on corgikbd.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.h>

#include <linux/interrupt.h>

#include <linux/jiffies.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/workqueue.h>



#include <asm/arch/hardware.h>

#include <asm/arch/aaed2000.h>



#define KB_ROWS			12

#define KB_COLS			8

#define KB_ROWMASK(r)		(1 << (r))

#define SCANCODE(r,c)		(((c) * KB_ROWS) + (r))

#define NR_SCANCODES		(KB_COLS * KB_ROWS)



#define SCAN_INTERVAL		(50) /* ms */

#define KB_ACTIVATE_DELAY	(20) /* us */



static unsigned char aaedkbd_keycode[NR_SCANCODES] = {

	KEY_9, KEY_0, KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, 0, KEY_SPACE, KEY_KP6, 0, KEY_KPDOT, 0, 0,

	KEY_K, KEY_M, KEY_O, KEY_DOT, KEY_SLASH, 0, KEY_F, 0, 0, 0, KEY_LEFTSHIFT, 0,

	KEY_I, KEY_P, KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, 0, 0, 0, 0, 0, KEY_RIGHTSHIFT, 0,

	KEY_8, KEY_L, KEY_SEMICOLON, KEY_APOSTROPHE, KEY_ENTER, 0, 0, 0, 0, 0, 0, 0,

	KEY_J, KEY_H, KEY_B, KEY_KP8, KEY_KP4, 0, KEY_C, KEY_D, KEY_S, KEY_A, 0, KEY_CAPSLOCK,

	KEY_Y, KEY_U, KEY_N, KEY_T, 0, 0, KEY_R, KEY_E, KEY_W, KEY_Q, 0, KEY_TAB,

	KEY_7, KEY_6, KEY_G, 0, KEY_5, 0, KEY_4, KEY_3, KEY_2, KEY_1, 0, KEY_GRAVE,

	0, 0, KEY_COMMA, 0, KEY_KP2, 0, KEY_V, KEY_LEFTALT, KEY_X, KEY_Z, 0, KEY_LEFTCTRL

};



struct aaedkbd {

	unsigned char keycode[ARRAY_SIZE(aaedkbd_keycode)];

	struct input_dev *input;

	struct work_struct workq;

	int kbdscan_state[KB_COLS];

	int kbdscan_count[KB_COLS];

};



#define KBDSCAN_STABLE_COUNT 2



static void aaedkbd_report_col(struct aaedkbd *aaedkbd,

				unsigned int col, unsigned int rowd)

{

	unsigned int scancode, pressed;

	unsigned int row;



	for (row = 0; row < KB_ROWS; row++) {

		scancode = SCANCODE(row, col);

		pressed = rowd & KB_ROWMASK(row);



		input_report_key(aaedkbd->input, aaedkbd->keycode[scancode], pressed);

	}

}



/* Scan the hardware keyboard and push any changes up through the input layer */

static void aaedkbd_work(void *data)

{

	struct aaedkbd *aaedkbd = data;

	unsigned int col, rowd;



	col = 0;

	do {

		AAEC_GPIO_KSCAN = col + 8;

		udelay(KB_ACTIVATE_DELAY);

		rowd = AAED_EXT_GPIO & AAED_EGPIO_KBD_SCAN;



		if (rowd != aaedkbd->kbdscan_state[col]) {

			aaedkbd->kbdscan_count[col] = 0;

			aaedkbd->kbdscan_state[col] = rowd;

		} else if (++aaedkbd->kbdscan_count[col] >= KBDSCAN_STABLE_COUNT) {

			aaedkbd_report_col(aaedkbd, col, rowd);

			col++;

		}

	} while (col < KB_COLS);



	AAEC_GPIO_KSCAN = 0x07;

	input_sync(aaedkbd->input);



	schedule_delayed_work(&aaedkbd->workq, msecs_to_jiffies(SCAN_INTERVAL));

}



static int aaedkbd_open(struct input_dev *indev)

{

	struct aaedkbd *aaedkbd = indev->private;



	schedule_delayed_work(&aaedkbd->workq, msecs_to_jiffies(SCAN_INTERVAL));



	return 0;

}



static void aaedkbd_close(struct input_dev *indev)

{

	struct aaedkbd *aaedkbd = indev->private;



	cancel_delayed_work(&aaedkbd->workq);

	flush_scheduled_work();

}



static int __devinit aaedkbd_probe(struct platform_device *pdev)

{

	struct aaedkbd *aaedkbd;

	struct input_dev *input_dev;

	int i;

	int error;



	aaedkbd = kzalloc(sizeof(struct aaedkbd), GFP_KERNEL);

	input_dev = input_allocate_device();

	if (!aaedkbd || !input_dev) {

		error = -ENOMEM;

		goto fail;

	}



	platform_set_drvdata(pdev, aaedkbd);



	aaedkbd->input = input_dev;



	/* Init keyboard rescan workqueue */

	INIT_WORK(&aaedkbd->workq, aaedkbd_work, aaedkbd);



	memcpy(aaedkbd->keycode, aaedkbd_keycode, sizeof(aaedkbd->keycode));



	input_dev->name = "AAED-2000 Keyboard";

	input_dev->phys = "aaedkbd/input0";

	input_dev->id.bustype = BUS_HOST;

	input_dev->id.vendor = 0x0001;

	input_dev->id.product = 0x0001;

	input_dev->id.version = 0x0100;

	input_dev->cdev.dev = &pdev->dev;

	input_dev->private = aaedkbd;



	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);

	input_dev->keycode = aaedkbd->keycode;

	input_dev->keycodesize = sizeof(unsigned char);

	input_dev->keycodemax = ARRAY_SIZE(aaedkbd_keycode);



	for (i = 0; i < ARRAY_SIZE(aaedkbd_keycode); i++)

		set_bit(aaedkbd->keycode[i], input_dev->keybit);

	clear_bit(0, input_dev->keybit);



	input_dev->open = aaedkbd_open;

	input_dev->close = aaedkbd_close;



	error = input_register_device(aaedkbd->input);

	if (error)

		goto fail;



	return 0;



 fail:	kfree(aaedkbd);

	input_free_device(input_dev);

	return error;

}



static int __devexit aaedkbd_remove(struct platform_device *pdev)

{

	struct aaedkbd *aaedkbd = platform_get_drvdata(pdev);



	input_unregister_device(aaedkbd->input);

	kfree(aaedkbd);



	return 0;

}



static struct platform_driver aaedkbd_driver = {

	.probe		= aaedkbd_probe,

	.remove		= __devexit_p(aaedkbd_remove),

	.driver		= {

		.name	= "aaed2000-keyboard",

	},

};



static int __init aaedkbd_init(void)

{

	return platform_driver_register(&aaedkbd_driver);

}



static void __exit aaedkbd_exit(void)

{

	platform_driver_unregister(&aaedkbd_driver);

}



module_init(aaedkbd_init);

module_exit(aaedkbd_exit);



MODULE_AUTHOR("Nicolas Bellido Y Ortega");

MODULE_DESCRIPTION("AAED-2000 Keyboard Driver");

MODULE_LICENSE("GPLv2");