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/*
* 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");
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