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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Linus Nielsen Feltzing
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "button.h"
#include "backlight.h"
#include "system.h"
#include "backlight-target.h"
#include "avic-imx31.h"
#include "clkctl-imx31.h"
#include "mc13783.h"
/* Most code in here is taken from the Linux BSP provided by Freescale
* Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved. */
#ifdef HAVE_HEADPHONE_DETECTION
static bool headphones_detect = false;
#endif
static uint32_t int_btn = BUTTON_NONE;
static bool hold_button = false;
#ifdef BOOTLOADER
static bool initialized = false;
#else
static bool hold_button_old = false;
#endif
#define _button_hold() (GPIO3_DR & 0x10)
static __attribute__((interrupt("IRQ"))) void KPP_HANDLER(void)
{
static const struct key_mask_shift
{
uint8_t mask;
uint8_t shift;
} kms[3] =
{
{ 0x1f, 0 }, /* BUTTON_LEFT...BUTTON_SELECT */
{ 0x03, 5 }, /* BUTTON_BACK...BUTTON_MENU */
{ 0x1f, 7 }, /* BUTTON_VOL_UP...BUTTON_NEXT */
};
int col;
/* Power button is handled separately on PMIC */
int button = int_btn & BUTTON_POWER;
int oldlevel = disable_irq_save();
/* 1. Disable both (depress and release) keypad interrupts. */
KPP_KPSR &= ~(KPP_KPSR_KRIE | KPP_KPSR_KDIE);
for (col = 0; col < 3; col++) /* Col */
{
int i;
/* 2. Write 1s to KPDR[10:8] setting column data to 1s */
KPP_KPDR |= (0x7 << 8);
/* 3. Configure columns as totem pole outputs(for quick
* discharging of keypad capacitance) */
KPP_KPCR &= ~(0x7 << 8);
/* Give the columns time to discharge */
for (i = 0; i < 128; i++) /* TODO: find minimum safe delay */
asm volatile ("");
/* 4. Configure columns as open-drain */
KPP_KPCR |= (0x7 << 8);
/* 5. Write a single column to 0, others to 1.
* 6. Sample row inputs and save data. Multiple key presses
* can be detected on a single column.
* 7. Repeat steps 2 - 6 for remaining columns. */
/* Col bit starts at 8th bit in KPDR */
KPP_KPDR &= ~(0x100 << col);
/* Delay added to avoid propagating the 0 from column to row
* when scanning. */
for (i = 0; i < 128; i++) /* TODO: find minimum safe delay */
asm volatile ("");
/* Read row input */
button |= (~KPP_KPDR & kms[col].mask) << kms[col].shift;
}
/* 8. Return all columns to 0 in preparation for standby mode. */
KPP_KPDR &= ~(0x7 << 8);
/* 9. Clear KPKD and KPKR status bit(s) by writing to a .1.,
* set the KPKR synchronizer chain by writing "1" to KRSS register,
* clear the KPKD synchronizer chain by writing "1" to KDSC register */
KPP_KPSR = KPP_KPSR_KRSS | KPP_KPSR_KDSC | KPP_KPSR_KPKR | KPP_KPSR_KPKD;
/* 10. Re-enable the appropriate keypad interrupt(s) so that the KDIE
* detects a key hold condition, or the KRIE detects a key-release
* event. */
if ((button & ~BUTTON_POWER) != BUTTON_NONE)
KPP_KPSR |= KPP_KPSR_KRIE;
else
KPP_KPSR |= KPP_KPSR_KDIE;
restore_irq(oldlevel);
int_btn = button;
}
bool button_hold(void)
{
return _button_hold();
}
int button_read_device(void)
{
/* Simple poll of GPIO status */
hold_button = _button_hold();
#ifndef BOOTLOADER
/* Backlight hold handling */
if (hold_button != hold_button_old)
{
hold_button_old = hold_button;
backlight_hold_changed(hold_button);
}
#endif
/* Enable the keypad interrupt to cause it to fire if a key is down.
* KPP_HANDLER will clear and disable it after the scan. If no key
* is depressed then this bit will already be set in waiting for the
* first key down event. */
KPP_KPSR |= KPP_KPSR_KDIE;
/* If hold, ignore any pressed button */
return hold_button ? BUTTON_NONE : int_btn;
}
/* This is called from the mc13783 interrupt thread */
void button_power_event(void)
{
bool pressed =
(mc13783_read(MC13783_INTERRUPT_SENSE1) & MC13783_ONOFD1S) == 0;
/* Prevent KPP_HANDLER from changing things */
int oldlevel = disable_irq_save();
if (pressed)
{
int_btn |= BUTTON_POWER;
}
else
{
int_btn &= ~BUTTON_POWER;
}
restore_irq(oldlevel);
}
#ifdef HAVE_HEADPHONE_DETECTION
/* This is called from the mc13783 interrupt thread */
void headphone_detect_event(void)
{
/* FIXME: Not really the correct method */
headphones_detect =
(mc13783_read(MC13783_INTERRUPT_SENSE1) & MC13783_ONOFD2S) == 0;
}
bool headphones_inserted(void)
{
return headphones_detect;
}
#endif /* HAVE_HEADPHONE_DETECTION */
void button_init_device(void)
{
#ifdef BOOTLOADER
/* Can be called more than once in the bootloader */
if (initialized)
return;
initialized = true;
#endif
/* Enable keypad clock */
imx31_clkctl_module_clock_gating(CG_KPP, CGM_ON_ALL);
/* 1. Enable number of rows in keypad (KPCR[4:0])
*
* Configure the rows/cols in KPP
* LSB nybble in KPP is for 5 rows
* MSB nybble in KPP is for 3 cols */
KPP_KPCR |= 0x1f;
/* 2. Write 0's to KPDR[10:8] */
KPP_KPDR &= ~(0x7 << 8);
/* 3. Configure the keypad columns as open-drain (KPCR[10:8]). */
KPP_KPCR |= (0x7 << 8);
/* 4. Configure columns as output, rows as input (KDDR[10:8,4:0]) */
KPP_KDDR = (KPP_KDDR | (0x7 << 8)) & ~0x1f;
/* 5. Clear the KPKD Status Flag and Synchronizer chain.
* 6. Set the KDIE control bit bit. */
KPP_KPSR = KPP_KPSR_KDIE | KPP_KPSR_KRSS | KPP_KPSR_KDSC | KPP_KPSR_KPKD;
/* KPP IRQ at priority 3 */
avic_enable_int(KPP, IRQ, 3, KPP_HANDLER);
button_power_event();
mc13783_enable_event(MC13783_ONOFD1_EVENT);
#ifdef HAVE_HEADPHONE_DETECTION
headphone_detect_event();
mc13783_enable_event(MC13783_ONOFD2_EVENT);
#endif
}
#ifdef BUTTON_DRIVER_CLOSE
void button_close_device(void)
{
int oldlevel = disable_irq_save();
avic_disable_int(KPP);
KPP_KPSR &= ~(KPP_KPSR_KRIE | KPP_KPSR_KDIE);
int_btn = BUTTON_NONE;
restore_irq(oldlevel);
}
#endif /* BUTTON_DRIVER_CLOSE */
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