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/* Driver for the keypad attached to the TI Calypso */
/* (C) 2010 by roh <roh@hyte.de>
*
* All Rights Reserved
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdint.h>
#include <stdio.h>
#include <debug.h>
#include <delay.h>
#include <memory.h>
#include <keypad.h>
#include <calypso/irq.h>
#include <abb/twl3025.h>
#define KBR_LATCH_REG 0xfffe480a
#define KBC_REG 0xfffe480c
#define KBD_GPIO_INT 0xfffe4816
#define KBD_GPIO_MASKIT 0xfffe4818
static key_handler_t key_handler = NULL;
void emit_key(uint8_t key, uint8_t state)
{
printf("key=%u %s\n", key, state == PRESSED ? "pressed" : "released");
if (state == RELEASED)
if (key == KEY_POWER)
twl3025_power_off();
if(key_handler) {
key_handler(key, state);
}
}
volatile uint32_t lastbuttons;
#define BTN_TO_KEY(name) \
((diff & BTN_##name) == BTN_##name) \
{ \
key = KEY_##name; \
diff = diff & ~BTN_##name; \
}
void dispatch_buttons(uint32_t buttons)
{
uint8_t state;
if (buttons == lastbuttons)
return;
if (buttons > lastbuttons)
state = PRESSED;
else
state = RELEASED;
uint32_t diff = buttons ^ lastbuttons;
uint8_t key=KEY_INV;
while (diff != 0)
{
if BTN_TO_KEY(POWER)
else if BTN_TO_KEY(0)
else if BTN_TO_KEY(1)
else if BTN_TO_KEY(2)
else if BTN_TO_KEY(3)
else if BTN_TO_KEY(4)
else if BTN_TO_KEY(5)
else if BTN_TO_KEY(6)
else if BTN_TO_KEY(7)
else if BTN_TO_KEY(8)
else if BTN_TO_KEY(9)
else if BTN_TO_KEY(STAR)
else if BTN_TO_KEY(HASH)
else if BTN_TO_KEY(MENU)
else if BTN_TO_KEY(LEFT_SB)
else if BTN_TO_KEY(RIGHT_SB)
else if BTN_TO_KEY(UP)
else if BTN_TO_KEY(DOWN)
else if BTN_TO_KEY(LEFT)
else if BTN_TO_KEY(RIGHT)
else if BTN_TO_KEY(OK)
else
{
printf("\nunknown keycode: 0x%08x\n", diff);
break;
}
if ( key == KEY_POWER )
diff = 0;
emit_key(key, state);
}
lastbuttons = buttons;
}
static void keypad_irq(enum irq_nr nr)
{
keypad_scan();
}
void keypad_init()
{
lastbuttons = 0;
writew(0, KBD_GPIO_MASKIT);
writew(0, KBC_REG);
irq_register_handler(IRQ_KEYPAD_GPIO, &keypad_irq);
irq_config(IRQ_KEYPAD_GPIO, 0, 0, 0);
irq_enable(IRQ_KEYPAD_GPIO);
}
void keypad_set_handler(key_handler_t handler)
{
key_handler = handler;
}
void keypad_scan()
{
uint16_t reg;
uint16_t col;
uint32_t buttons;
// putchar('\n');
buttons = 0x0;
//scan for BTN_POWER
writew(0xff, KBC_REG);
delay_ms(1);
reg = readw(KBR_LATCH_REG);
// printd("%02x ", (~reg & 0x1f));
buttons = buttons | ((~reg & 0x1f) << 20 );
//scan for muxed keys if not powerbtn
if ((~reg & 0x1f) != 0x10)
for (col=0;col<4;col++)
{
writew(0x1f & ~(0x1 << col ), KBC_REG);
delay_ms(1);
reg = readw(KBR_LATCH_REG);
buttons = buttons | ((~reg & 0x1f) << (col * 5 ));
// printd("%02x ", (~reg & 0x1f));
}
//enable keypad irq via master 'or' gate (needs col lines low in idle to work)
writew(0, KBC_REG);
dispatch_buttons(buttons);
}
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