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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2021 Aidan MacDonald, Dana Conrad
*
* 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 "button.h"
#include "kernel.h"
#include "backlight.h"
#include "powermgmt.h"
#include "panic.h"
#include "axp-pmu.h"
#include "gpio-x1000.h"
#include "irq-x1000.h"
#include "i2c-x1000.h"
#include "eros_qn_codec.h"
#include <string.h>
#include <stdbool.h>
#ifndef BOOTLOADER
# include "lcd.h"
# include "font.h"
#endif
/* ===========================================
* | OLD STATE | NEW STATE | DIRECTION |
* | 0 0 | 0 0 | 0: NO CHANGE |
* | 0 0 | 0 1 | -1: CCW |
* | 0 0 | 1 0 | 1: CW |
* | 0 0 | 1 1 | 0: INVALID |
* | 0 1 | 0 0 | 1: CW |
* | 0 1 | 0 1 | 0: NO CHANGE |
* | 0 1 | 1 0 | 0: INVALID |
* | 0 1 | 1 1 | -1: CCW |
* | 1 0 | 0 0 | -1: CCW |
* | 1 0 | 0 1 | 0: INVALID |
* | 1 0 | 1 0 | 0: NO CHANGE |
* | 1 0 | 1 1 | 1: CW |
* | 1 1 | 0 0 | 0: INVALID |
* | 1 1 | 0 1 | 1: CW |
* | 1 1 | 1 0 | -1: CCW |
* | 1 1 | 1 1 | 0: NO CHANGE |
* ===========================================
*
* Quadrature explanation since it's not plainly obvious how this works:
*
* If either of the quadrature lines change, we can look up the combination
* of previous state and new state in the table above (enc_state[] below)
* and it tells us whether to add 1, subtract 1, or no change from the sum (enc_position).
* This also gives us a nice debounce, since each state can only have 1 pin change
* at a time. I didn't come up with this, but I've used it before and it works well.
*
* Old state is 2 higher bits, new state is 2 lower bits of enc_current_state. */
/* list of valid quadrature states and their directions */
signed char enc_state[] = {0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0};
volatile unsigned char enc_current_state = 0;
volatile signed int enc_position = 0;
/* Value of headphone detect register */
static uint8_t hp_detect_reg = 0x00;
static uint8_t hp_detect_reg_old = 0x00;
/* Interval to poll the register */
#define HPD_POLL_TIME (HZ/2)
static int hp_detect_tmo_cb(struct timeout* tmo)
{
i2c_descriptor* d = (i2c_descriptor*)tmo->data;
i2c_async_queue(AXP_PMU_BUS, TIMEOUT_NOBLOCK, I2C_Q_ADD, 0, d);
return HPD_POLL_TIME;
}
static void hp_detect_init(void)
{
static struct timeout tmo;
static const uint8_t gpio_reg = AXP192_REG_GPIOSTATE1;
static i2c_descriptor desc = {
.slave_addr = AXP_PMU_ADDR,
.bus_cond = I2C_START | I2C_STOP,
.tran_mode = I2C_READ,
.buffer[0] = (void*)&gpio_reg,
.count[0] = 1,
.buffer[1] = &hp_detect_reg,
.count[1] = 1,
.callback = NULL,
.arg = 0,
.next = NULL,
};
/* Headphone and LO detects are wired to AXP192 GPIOs 0 and 1,
* set them to inputs. */
i2c_reg_write1(AXP_PMU_BUS, AXP_PMU_ADDR, AXP192_REG_GPIO0FUNCTION, 0x01); /* HP detect */
i2c_reg_write1(AXP_PMU_BUS, AXP_PMU_ADDR, AXP192_REG_GPIO1FUNCTION, 0x01); /* LO detect */
/* Get an initial reading before startup */
int r = i2c_reg_read1(AXP_PMU_BUS, AXP_PMU_ADDR, gpio_reg);
if(r >= 0)
{
hp_detect_reg = r;
hp_detect_reg_old = hp_detect_reg;
}
/* Poll the register every second */
timeout_register(&tmo, &hp_detect_tmo_cb, HPD_POLL_TIME, (intptr_t)&desc);
}
bool headphones_inserted(void)
{
/* if the status has changed, set the output volume accordingly */
if ((hp_detect_reg & 0x30) != (hp_detect_reg_old & 0x30))
{
hp_detect_reg_old = hp_detect_reg;
#if !defined(BOOTLOADER)
pcm5102_set_outputs();
#endif
}
return hp_detect_reg & 0x10 ? false : true;
}
bool lineout_inserted(void)
{
/* if the status has changed, set the output volume accordingly */
if ((hp_detect_reg & 0x30) != (hp_detect_reg_old & 0x30))
{
hp_detect_reg_old = hp_detect_reg;
#if !defined(BOOTLOADER)
pcm5102_set_outputs();
#endif
}
return hp_detect_reg & 0x20 ? false : true;
}
/* Rockbox interface */
void button_init_device(void)
{
/* set both quadrature lines to interrupts */
gpio_set_function(GPIO_BTN_SCROLL_A, GPIOF_IRQ_EDGE(1));
gpio_set_function(GPIO_BTN_SCROLL_B, GPIOF_IRQ_EDGE(1));
/* set interrupts to fire on the next edge based on current state */
gpio_flip_edge_irq(GPIO_BTN_SCROLL_A);
gpio_flip_edge_irq(GPIO_BTN_SCROLL_B);
/* get current state of both encoder gpios */
enc_current_state = (REG_GPIO_PIN(GPIO_B)>>21) & 0x0c;
/* enable quadrature interrupts */
gpio_enable_irq(GPIO_BTN_SCROLL_A);
gpio_enable_irq(GPIO_BTN_SCROLL_B);
/* Set up headphone and line out detect polling */
hp_detect_init();
}
/* wheel Quadrature line A interrupt */
void GPIOB24(void)
{
/* fill state with previous (2 higher bits) and current (2 lower bits) */
enc_current_state = (enc_current_state & 0x0c) | ((REG_GPIO_PIN(GPIO_B)>>23) & 0x03);
/* look up in table */
enc_position = enc_position + enc_state[(enc_current_state)];
/* move current state to previous state if valid data */
if (enc_state[(enc_current_state)] != 0)
enc_current_state = (enc_current_state << 2);
/* we want the other edge next time */
gpio_flip_edge_irq(GPIO_BTN_SCROLL_A);
}
/* wheel Quadrature line B interrupt */
void GPIOB23(void)
{
/* fill state with previous (2 higher bits) and current (2 lower bits) */
enc_current_state = (enc_current_state & 0x0c) | ((REG_GPIO_PIN(GPIO_B)>>23) & 0x03);
/* look up in table */
enc_position = enc_position + enc_state[(enc_current_state)];
/* move current state to previous state if valid data */
if (enc_state[(enc_current_state)] != 0)
enc_current_state = (enc_current_state << 2);
/* we want the other edge next time */
gpio_flip_edge_irq(GPIO_BTN_SCROLL_B);
}
int button_read_device(void)
{
int r = 0;
/* Read GPIOs for normal buttons */
uint32_t a = REG_GPIO_PIN(GPIO_A);
uint32_t b = REG_GPIO_PIN(GPIO_B);
uint32_t c = REG_GPIO_PIN(GPIO_C);
uint32_t d = REG_GPIO_PIN(GPIO_D);
/* All buttons are active low */
if((a & (1 << 16)) == 0) r |= BUTTON_PLAY;
if((a & (1 << 17)) == 0) r |= BUTTON_VOL_UP;
if((a & (1 << 19)) == 0) r |= BUTTON_VOL_DOWN;
if((b & (1 << 7)) == 0) r |= BUTTON_POWER;
if((b & (1 << 28)) == 0) r |= BUTTON_MENU;
if((b & (1 << 28)) == 0) r |= BUTTON_MENU;
if((d & (1 << 4)) == 0) r |= BUTTON_PREV;
if((d & (1 << 5)) == 0) r |= BUTTON_BACK;
if((c & (1 << 24)) == 0) r |= BUTTON_NEXT;
/* check encoder - from testing, each indent is 2 state changes or so */
if (enc_position > 1)
{
/* need to use queue_post() in order to do BUTTON_SCROLL_*,
* Rockbox treats these buttons differently. */
queue_post(&button_queue, BUTTON_SCROLL_FWD, 0);
enc_position = 0;
}
else if (enc_position < -1)
{
/* need to use queue_post() in order to do BUTTON_SCROLL_*,
* Rockbox treats these buttons differently. */
queue_post(&button_queue, BUTTON_SCROLL_BACK, 0);
enc_position = 0;
}
return r;
}
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