/*************************************************************************** * __________ __ ___. * 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 */