mirror of
https://github.com/Rockbox/rockbox.git
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9e2c85e076
This is part of the preparation to add support for iPod Nano 3G and Nano 4G. There are some optimisations left, like merging similar blocks of registers that share the same layout, but the base address have changed between SoC generations. Change-Id: I4f06727b4061977141b65d39ae19591bd5b29680
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 "s5l87xx.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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