753b7a90e1
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19830 a1c6a512-1295-4272-9138-f99709370657
233 lines
6.6 KiB
C
233 lines
6.6 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) 2006 by Linus Nielsen Feltzing
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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 "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "button.h"
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#include "backlight.h"
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#include "system.h"
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#include "backlight-target.h"
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#include "avic-imx31.h"
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#include "clkctl-imx31.h"
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#include "mc13783.h"
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/* Most code in here is taken from the Linux BSP provided by Freescale
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* Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved. */
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static uint32_t int_btn = BUTTON_NONE;
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static bool hold_button = false;
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#ifdef BOOTLOADER
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static bool initialized = false;
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#else
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static bool hold_button_old = false;
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#endif
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#define _button_hold() (GPIO3_DR & 0x10)
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static __attribute__((interrupt("IRQ"))) void KPP_HANDLER(void)
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{
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static const struct key_mask_shift
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{
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uint8_t mask;
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uint8_t shift;
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} kms[3] =
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{
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{ 0x1f, 0 }, /* BUTTON_LEFT...BUTTON_SELECT */
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{ 0x03, 5 }, /* BUTTON_BACK...BUTTON_MENU */
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{ 0x1f, 7 }, /* BUTTON_VOL_UP...BUTTON_NEXT */
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};
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int col;
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/* Power button is handled separately on PMIC */
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int button = int_btn & BUTTON_POWER;
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int oldlevel = disable_irq_save();
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/* 1. Disable both (depress and release) keypad interrupts. */
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KPP_KPSR &= ~(KPP_KPSR_KRIE | KPP_KPSR_KDIE);
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for (col = 0; col < 3; col++) /* Col */
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{
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/* 2. Write 1s to KPDR[10:8] setting column data to 1s */
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KPP_KPDR |= (0x7 << 8);
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/* 3. Configure columns as totem pole outputs(for quick
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* discharging of keypad capacitance) */
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KPP_KPCR &= ~(0x7 << 8);
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/* Give the columns time to discharge */
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udelay(2);
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/* 4. Configure columns as open-drain */
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KPP_KPCR |= (0x7 << 8);
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/* 5. Write a single column to 0, others to 1.
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* 6. Sample row inputs and save data. Multiple key presses
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* can be detected on a single column.
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* 7. Repeat steps 2 - 6 for remaining columns. */
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/* Col bit starts at 8th bit in KPDR */
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KPP_KPDR &= ~(0x100 << col);
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/* Delay added to avoid propagating the 0 from column to row
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* when scanning. */
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udelay(2);
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/* Read row input */
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button |= (~KPP_KPDR & kms[col].mask) << kms[col].shift;
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}
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/* 8. Return all columns to 0 in preparation for standby mode. */
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KPP_KPDR &= ~(0x7 << 8);
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/* 9. Clear KPKD and KPKR status bit(s) by writing to a .1.,
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* set the KPKR synchronizer chain by writing "1" to KRSS register,
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* clear the KPKD synchronizer chain by writing "1" to KDSC register */
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KPP_KPSR = KPP_KPSR_KRSS | KPP_KPSR_KDSC | KPP_KPSR_KPKR | KPP_KPSR_KPKD;
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/* 10. Re-enable the appropriate keypad interrupt(s) so that the KDIE
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* detects a key hold condition, or the KRIE detects a key-release
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* event. */
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if ((button & ~BUTTON_POWER) != BUTTON_NONE)
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KPP_KPSR |= KPP_KPSR_KRIE;
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else
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KPP_KPSR |= KPP_KPSR_KDIE;
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restore_irq(oldlevel);
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int_btn = button;
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}
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bool button_hold(void)
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{
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return _button_hold();
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}
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#ifdef HAVE_HEADPHONE_DETECTION
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/* Headphone driver pushes the data here */
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void button_headphone_set(int button)
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{
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int oldstatus = disable_irq_save();
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int_btn = (int_btn & ~BUTTON_REMOTE) | button;
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restore_irq(oldstatus);
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}
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#endif
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int button_read_device(void)
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{
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/* Simple poll of GPIO status */
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hold_button = _button_hold();
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#ifndef BOOTLOADER
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/* Backlight hold handling */
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if (hold_button != hold_button_old)
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{
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hold_button_old = hold_button;
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backlight_hold_changed(hold_button);
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}
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#endif
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/* Enable the keypad interrupt to cause it to fire if a key is down.
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* KPP_HANDLER will clear and disable it after the scan. If no key
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* is depressed then this bit will already be set in waiting for the
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* first key down event. */
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KPP_KPSR |= KPP_KPSR_KDIE;
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/* If hold, ignore any pressed button */
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return hold_button ? BUTTON_NONE : int_btn;
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}
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/* This is called from the mc13783 interrupt thread */
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void button_power_event(void)
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{
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bool pressed =
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(mc13783_read(MC13783_INTERRUPT_SENSE1) & MC13783_ONOFD1S) == 0;
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/* Prevent KPP_HANDLER from changing things */
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int oldlevel = disable_irq_save();
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if (pressed)
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{
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int_btn |= BUTTON_POWER;
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}
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else
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{
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int_btn &= ~BUTTON_POWER;
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}
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restore_irq(oldlevel);
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}
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void button_init_device(void)
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{
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#ifdef BOOTLOADER
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/* Can be called more than once in the bootloader */
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if (initialized)
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return;
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initialized = true;
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#endif
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/* Enable keypad clock */
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imx31_clkctl_module_clock_gating(CG_KPP, CGM_ON_ALL);
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/* 1. Enable number of rows in keypad (KPCR[4:0])
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*
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* Configure the rows/cols in KPP
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* LSB nybble in KPP is for 5 rows
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* MSB nybble in KPP is for 3 cols */
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KPP_KPCR |= 0x1f;
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/* 2. Write 0's to KPDR[10:8] */
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KPP_KPDR &= ~(0x7 << 8);
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/* 3. Configure the keypad columns as open-drain (KPCR[10:8]). */
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KPP_KPCR |= (0x7 << 8);
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/* 4. Configure columns as output, rows as input (KDDR[10:8,4:0]) */
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KPP_KDDR = (KPP_KDDR | (0x7 << 8)) & ~0x1f;
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/* 5. Clear the KPKD Status Flag and Synchronizer chain.
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* 6. Set the KDIE control bit bit. */
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KPP_KPSR = KPP_KPSR_KDIE | KPP_KPSR_KRSS | KPP_KPSR_KDSC | KPP_KPSR_KPKD;
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/* KPP IRQ at priority 3 */
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avic_enable_int(KPP, IRQ, 3, KPP_HANDLER);
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button_power_event();
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mc13783_enable_event(MC13783_ONOFD1_EVENT);
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#ifdef HAVE_HEADPHONE_DETECTION
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headphone_init();
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#endif
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}
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#ifdef BUTTON_DRIVER_CLOSE
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void button_close_device(void)
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{
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int oldlevel = disable_irq_save();
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avic_disable_int(KPP);
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KPP_KPSR &= ~(KPP_KPSR_KRIE | KPP_KPSR_KDIE);
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int_btn = BUTTON_NONE;
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restore_irq(oldlevel);
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}
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#endif /* BUTTON_DRIVER_CLOSE */
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