116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
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/***************************************************************************
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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) 2021 Aidan MacDonald
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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 "ft6x06.h"
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#include "kernel.h"
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#include "i2c-async.h"
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#include <string.h>
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struct ft6x06_driver {
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/* i2c bus data */
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int i2c_cookie;
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i2c_descriptor i2c_desc;
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/* callback for touch events */
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ft6x06_event_cb event_cb;
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/* buffer for I2C transfers */
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uint8_t raw_data[6];
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};
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static struct ft6x06_driver ft_drv;
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struct ft6x06_state ft6x06_state;
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static void ft6x06_i2c_callback(int status, i2c_descriptor* desc)
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{
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(void)desc;
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if(status != I2C_STATUS_OK)
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return;
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int evt = ft_drv.raw_data[1] >> 6;
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int tx = ft_drv.raw_data[2] | ((ft_drv.raw_data[1] & 0xf) << 8);
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int ty = ft_drv.raw_data[4] | ((ft_drv.raw_data[3] & 0xf) << 8);
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ft6x06_state.event = evt;
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#ifdef FT6x06_SWAP_AXES
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ft6x06_state.pos_x = ty;
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ft6x06_state.pos_y = tx;
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#else
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ft6x06_state.pos_x = tx;
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ft6x06_state.pos_y = ty;
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#endif
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ft_drv.event_cb(evt, ft6x06_state.pos_x, ft6x06_state.pos_y);
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}
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static void ft6x06_dummy_event_cb(int evt, int tx, int ty)
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{
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(void)evt;
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(void)tx;
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(void)ty;
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}
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void ft6x06_init(void)
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{
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/* Initialize stuff */
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memset(&ft_drv, 0, sizeof(ft_drv));
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ft_drv.event_cb = ft6x06_dummy_event_cb;
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ft6x06_state.event = FT6x06_EVT_NONE;
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ft6x06_state.pos_x = 0;
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ft6x06_state.pos_y = 0;
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/* Reserve bus management cookie */
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ft_drv.i2c_cookie = i2c_async_reserve_cookies(FT6x06_BUS, 1);
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/* Prep an I2C descriptor to read touch data */
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ft_drv.i2c_desc.slave_addr = FT6x06_ADDR;
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ft_drv.i2c_desc.bus_cond = I2C_START | I2C_STOP;
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ft_drv.i2c_desc.tran_mode = I2C_READ;
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ft_drv.i2c_desc.buffer[0] = &ft_drv.raw_data[5];
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ft_drv.i2c_desc.count[0] = 1;
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ft_drv.i2c_desc.buffer[1] = &ft_drv.raw_data[0];
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ft_drv.i2c_desc.count[1] = 5;
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ft_drv.i2c_desc.callback = ft6x06_i2c_callback;
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ft_drv.i2c_desc.arg = 0;
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ft_drv.i2c_desc.next = NULL;
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/* Set I2C register address */
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ft_drv.raw_data[5] = 0x02;
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}
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void ft6x06_set_event_cb(ft6x06_event_cb cb)
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{
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ft_drv.event_cb = cb ? cb : ft6x06_dummy_event_cb;
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}
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void ft6x06_enable(bool en)
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{
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i2c_reg_write1(FT6x06_BUS, FT6x06_ADDR, 0xa5, en ? 0 : 3);
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}
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void ft6x06_irq_handler(void)
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{
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/* We don't care if this fails, there's not much we can do about it */
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i2c_async_queue(FT6x06_BUS, TIMEOUT_NOBLOCK, I2C_Q_ONCE,
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ft_drv.i2c_cookie, &ft_drv.i2c_desc);
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}
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