c8e39403f4
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22203 a1c6a512-1295-4272-9138-f99709370657
156 lines
4 KiB
C
156 lines
4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2009 Bertrik Sikken
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdbool.h>
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#include "config.h"
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#include "inttypes.h"
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#include "s5l8700.h"
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#include "button.h"
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#include "button-target.h"
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/* Button driver for the touch keys on the Samsung YP-S3
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The exact controller is not known, but it is likely from Melfas.
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The protocol is as follows:
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* the communication is done using three signals: DRDY, DCLK and DOUT
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* in the idle state these signals are all high.
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* when a key is touched or released, the key controller pulls down DRDY
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and outputs the first bit of a 20-bit word on its DOUT signal.
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* the CPU stores the bit, then acknowledges it by toggling the DCLK signal.
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* the key controller prepares the next bit, then toggles its DRDY output,
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unless all 20 bits have been transferred (in that case it stays high).
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* the 20-bit word contains separate bits for each button, some fixed bits
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and a bit indicating the number of keys pressed (modulo 2).
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*/
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void button_init_device(void)
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{
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/* P0.5/P1.0 power switch input */
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PCON0 &= ~(3 << 10);
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PCON1 &= ~0x0000000F;
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/* P1.3 headphones detect input */
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PCON1 &= ~0x0000F000;
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/* P1.5 DATA, P1.6 DRDY inputs (touch key controller) */
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PCON1 &= ~0x0FF00000;
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/* P3.4 DCLK output (touch key controller) */
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PCON3 = (PCON3 & ~0x000F0000) | 0x00010000;
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PDAT3 |= (1 << 4);
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/* P4.3 hold switch input */
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PCON4 &= ~0x0000F000;
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}
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/* returns the raw 20-bit word from the touch key controller */
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static int tkey_read(void)
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{
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static int value = 0;
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int i;
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/* check activity */
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if (PDAT1 & (1 << 6)) {
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return value;
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}
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/* get key bits */
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value = 0;
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for (i = 0; i < 10; i++) {
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/* sample bit from falling edge of DRDY */
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while ((PDAT1 & (1 << 6)) != 0);
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value <<= 1;
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if (PDAT1 & (1 << 5)) {
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value |= 1;
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}
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/* acknowledge on DCLK */
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PDAT3 &= ~(1 << 4);
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/* sample bit from rising edge of DRDY */
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while ((PDAT1 & (1 << 6)) == 0);
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value <<= 1;
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if (PDAT1 & (1 << 5)) {
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value |= 1;
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}
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/* acknowledge on DCLK */
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PDAT3 |= (1 << 4);
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}
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return value;
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}
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int button_read_device(void)
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{
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int buttons = 0;
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int tkey_data;
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/* hold switch */
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if (button_hold()) {
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return 0;
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}
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/* power button */
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if (PDAT1 & (1 << 0)) {
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buttons |= BUTTON_POWER;
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}
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/* touch keys */
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tkey_data = tkey_read();
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if (tkey_data & (1 << 9)) {
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buttons |= BUTTON_BACK;
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}
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if (tkey_data & (1 << 8)) {
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buttons |= BUTTON_UP;
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}
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if (tkey_data & (1 << 7)) {
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buttons |= BUTTON_MENU;
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}
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if (tkey_data & (1 << 6)) {
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buttons |= BUTTON_LEFT;
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}
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if (tkey_data & (1 << 5)) {
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buttons |= BUTTON_SELECT;
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}
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if (tkey_data & (1 << 4)) {
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buttons |= BUTTON_RIGHT;
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}
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if (tkey_data & (1 << 3)) {
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buttons |= BUTTON_DOWN;
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}
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return buttons;
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}
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bool button_hold(void)
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{
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return (PDAT4 & (1 << 3));
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}
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bool headphones_inserted(void)
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{
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return ((PDAT1 & (1 << 3)) == 0);
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}
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