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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2013 by Amaury Pouly
*
* 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 <stdlib.h>
#include "cpu.h"
#include "kernel.h"
#include "button-imx233.h"
#include "lradc-imx233.h"
#include "pinctrl-imx233.h"
#include "power-imx233.h"
#include "backlight.h"
static int delay_chan = -1; /* delay channel used to trigger */
static int raw_val[LRADC_NUM_CHANNELS]; /* channel values sampled (last two) */
static int chan_mask; /* trigger channel mask */
static int irq_chan_mask; /* triggered channel mask */
static int src_map[LRADC_NUM_SOURCES]; /* physical -> virtual channel map */
static int src_mask; /* sampled source mask */
#ifdef HAS_BUTTON_HOLD
static int hold_idx = -1; /* index of hold button in map */
#endif
#ifdef HAVE_HEADPHONE_DETECTION
static int jack_idx = -1; /* index of jack detect in map */
#endif
/* LRADC margin for buttons */
#ifndef IMX233_BUTTON_LRADC_MARGIN
#define IMX233_BUTTON_LRADC_MARGIN 30
#endif
/* shortcut of button map */
#define MAP imx233_button_map
/* sample rate for LRADC */
#define RATE HZ
/* number of samples per irq */
#define SAMPLES 10
/* delay's delay */
#define DELAY (LRADC_DELAY_FREQ / RATE / SAMPLES)
/* correct value for channel with builtin dividers */
static int correct_lradc(int src, int raw)
{
if(src == LRADC_SRC_VDDIO)
return raw * 2;
else
return raw;
}
/* return raw value for the button */
int imx233_button_read_raw(int idx)
{
if(MAP[idx].periph == IMX233_BUTTON_GPIO)
return imx233_pinctrl_get_gpio(MAP[idx].u.gpio.bank, MAP[idx].u.gpio.pin);
else if(MAP[idx].periph == IMX233_BUTTON_LRADC)
return correct_lradc(MAP[idx].u.lradc.src, raw_val[src_map[MAP[idx].u.lradc.src]]);
else if(MAP[idx].periph == IMX233_BUTTON_PSWITCH)
return imx233_power_read_pswitch();
else
return -1;
}
/* return cooked (interpreted) value for the button, ignoring debouncing */
static bool imx233_button_read_cooked(int idx)
{
int raw = imx233_button_read_raw(idx);
bool res;
if(MAP[idx].periph == IMX233_BUTTON_GPIO)
{
res = raw;
}
else if(MAP[idx].periph == IMX233_BUTTON_LRADC)
{
/* correct value in relative mode */
int rel = MAP[idx].u.lradc.relative;
if(rel != -1)
raw = (raw * MAP[rel].u.lradc.value) / imx233_button_read_raw(rel);
switch(MAP[idx].u.lradc.op)
{
case IMX233_BUTTON_EQ:
res = abs(raw - MAP[idx].u.lradc.value) <= MAP[idx].u.lradc.margin;
break;
case IMX233_BUTTON_GT:
res = raw > MAP[idx].u.lradc.value;
break;
case IMX233_BUTTON_LT:
res = raw < MAP[idx].u.lradc.value;
break;
default:
res = false;
break;
}
}
else if(MAP[idx].periph == IMX233_BUTTON_PSWITCH)
{
res = raw == MAP[idx].u.pswitch.level;
}
else
res = false;
/* handle inversion */
if(MAP[idx].flags & IMX233_BUTTON_INVERTED)
res = !res;
return res;
}
/* finish round */
static void do_round(void)
{
for(int i = 0; MAP[i].btn != IMX233_BUTTON_END; i++)
{
bool cooked = imx233_button_read_cooked(i);
if(MAP[i].last_val == cooked)
MAP[i].rounds = MIN(MAP[i].rounds + 1, MAP[i].threshold);
else
MAP[i].rounds = 1;
MAP[i].last_val = cooked;
}
}
/* process IRQ */
static void button_lradc_irq(int chan)
{
/* read value */
raw_val[chan] = imx233_lradc_read_channel(chan) / SAMPLES;
imx233_lradc_clear_channel(chan);
imx233_lradc_setup_sampling(chan, true, SAMPLES - 1);
/* record irq, trigger delay if all IRQs have been fired */
irq_chan_mask |= 1 << chan;
if(irq_chan_mask == chan_mask)
{
irq_chan_mask = 0;
do_round();
imx233_lradc_setup_delay(delay_chan, chan_mask, 0, SAMPLES - 1, DELAY);
imx233_lradc_kick_delay(delay_chan);
}
}
bool imx233_button_read_btn(int idx)
{
return MAP[idx].rounds >= MAP[idx].threshold ? MAP[idx].last_val : false;
}
int imx233_button_read(int others)
{
int res = others;
#ifdef HAS_BUTTON_HOLD
if(imx233_button_read_hold())
return 0;
#endif
for(int i = 0; MAP[i].btn != IMX233_BUTTON_END; i++)
{
if(MAP[i].btn >= 0 && imx233_button_read_btn(i))
res |= MAP[i].btn;
}
return res;
}
#ifdef HAS_BUTTON_HOLD
bool imx233_button_read_hold(void)
{
return imx233_button_read_btn(hold_idx);
}
bool __attribute__((weak)) button_hold(void)
{
bool hold_button = imx233_button_read_hold();
#ifndef BOOTLOADER
static bool hold_button_old = false;
/* light handling */
if (hold_button != hold_button_old)
{
hold_button_old = hold_button;
backlight_hold_changed(hold_button);
}
#endif /* BOOTLOADER */
return hold_button;
}
#endif
#ifdef HAVE_HEADPHONE_DETECTION
bool imx233_button_read_jack(void)
{
return imx233_button_read_btn(jack_idx);
}
bool __attribute__((weak)) headphones_inserted(void)
{
return imx233_button_read_jack();
}
#endif
/* return number of debouncing rounds by type of peripheral */
static int threshold_by_periph(int periph)
{
if(periph == IMX233_BUTTON_GPIO) return 1; // no debouncing
if(periph == IMX233_BUTTON_LRADC) return 2; // 2 times at HZ gives ~10 ms hold
if(periph == IMX233_BUTTON_PSWITCH) return 10; // PSWITCH is very slow to ramp
return 1; // other ?
}
void imx233_button_init(void)
{
/* go through the table and init stuff which needs to be */
for(int i = 0; MAP[i].btn != IMX233_BUTTON_END; i++)
{
MAP[i].threshold = threshold_by_periph(MAP[i].periph);
if(MAP[i].periph == IMX233_BUTTON_GPIO)
{
imx233_pinctrl_acquire(MAP[i].u.gpio.bank, MAP[i].u.gpio.pin, MAP[i].name);
imx233_pinctrl_set_function(MAP[i].u.gpio.bank, MAP[i].u.gpio.pin, PINCTRL_FUNCTION_GPIO);
imx233_pinctrl_enable_gpio(MAP[i].u.gpio.bank, MAP[i].u.gpio.pin, false);
bool pullup = !!(MAP[i].flags & IMX233_BUTTON_PULLUP);
imx233_pinctrl_enable_pullup(MAP[i].u.gpio.bank, MAP[i].u.gpio.pin, pullup);
}
else if(MAP[i].periph == IMX233_BUTTON_LRADC)
{
/* use default value for margin */
if(MAP[i].u.lradc.margin == 0)
MAP[i].u.lradc.margin = IMX233_BUTTON_LRADC_MARGIN;
int src = MAP[i].u.lradc.src;
/* if channel was already acquired, there is nothing to do */
if(src_mask & (1 << src))
continue;
src_map[src] = imx233_lradc_acquire_channel(LRADC_SRC(src), TIMEOUT_NOBLOCK);
if(src_map[src] < 0)
panicf("Cannot get channel for %s", MAP[i].name);
imx233_lradc_setup_source(src_map[src], true, src);
imx233_lradc_setup_sampling(src_map[src], true, SAMPLES - 1);
imx233_lradc_enable_channel_irq(src_map[src], true);
imx233_lradc_set_channel_irq_callback(src_map[src], button_lradc_irq);
src_mask |= 1 << src;
chan_mask |= 1 << src_map[src];
}
#ifdef HAS_BUTTON_HOLD
if(MAP[i].btn == IMX233_BUTTON_HOLD)
hold_idx = i;
#endif
#ifdef HAVE_HEADPHONE_DETECTION
if(MAP[i].btn == IMX233_BUTTON_JACK)
jack_idx = i;
#endif
}
#ifdef HAS_BUTTON_HOLD
if(hold_idx == -1)
panicf("No hold entry found");
#endif
#ifdef HAVE_HEADPHONE_DETECTION
if(jack_idx == -1)
panicf("No jack entry found");
#endif
/* create delay channel if necessary
* NOTE other buttons are polled as part of the delay irq processing */
if(src_mask != 0)
{
delay_chan = imx233_lradc_acquire_delay(TIMEOUT_NOBLOCK);
if(delay_chan < 0)
panicf("Cannot get delay channel");
imx233_lradc_setup_delay(delay_chan, chan_mask, 0, SAMPLES - 1, DELAY);
imx233_lradc_kick_delay(delay_chan);
}
/* otherwise we need to regularly poll for other buttons */
else
tick_add_task(do_round);
}
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