44acbc6629
The FT6x06 driver used for the Shanling Q1's touchscreen has been extended to report more than one touch point. It can also return the gesture detected by the controller, but this doesn't seem to report anything useful on the Q1. Multi-touch is only useful in 3x3 grid mode since the Rockbox button API cannot report more than one touch point. The FiiO M3K uses the same driver so it's been updated to the multi-touch API, but functionality is unchanged. Change-Id: I4de42f44808d6eb902e3da212d8f936b7a5042c7
129 lines
3.8 KiB
C
129 lines
3.8 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) 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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#define BYTES_PER_POINT 6
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#ifdef FT6x06_SWAP_AXES
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# define POS_X pos_y
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# define POS_Y pos_x
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#else
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# define POS_X pos_x
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# define POS_Y pos_y
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#endif
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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[1 + 2 + BYTES_PER_POINT * FT6x06_NUM_POINTS];
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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 inline void ft6x06_convert_point(const uint8_t* raw,
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struct ft6x06_point* pt)
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{
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pt->event = (raw[0] >> 6) & 0x3;
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pt->touch_id = (raw[2] >> 4) & 0xf;
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pt->POS_X = ((raw[0] & 0xf) << 8) | raw[1];
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pt->POS_Y = ((raw[2] & 0xf) << 8) | raw[3];
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pt->weight = raw[4];
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pt->area = (raw[5] >> 4) & 0xf;
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}
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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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ft6x06_state.gesture = ft_drv.raw_data[1];
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ft6x06_state.nr_points = ft_drv.raw_data[2] & 0xf;
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for(int i = 0; i < FT6x06_NUM_POINTS; ++i) {
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ft6x06_convert_point(&ft_drv.raw_data[3 + i * BYTES_PER_POINT],
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&ft6x06_state.points[i]);
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}
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ft_drv.event_cb(&ft6x06_state);
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}
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static void ft6x06_dummy_event_cb(struct ft6x06_state* state)
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{
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(void)state;
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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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memset(&ft6x06_state, 0, sizeof(struct ft6x06_state));
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ft6x06_state.gesture = -1;
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for(int i = 0; i < FT6x06_NUM_POINTS; ++i)
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ft6x06_state.points[i].event = FT6x06_EVT_NONE;
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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[0];
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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[1];
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ft_drv.i2c_desc.count[1] = sizeof(ft_drv.raw_data) - 1;
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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[0] = 0x01;
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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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