98 lines
2.3 KiB
C++
98 lines
2.3 KiB
C++
/*
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* \brief EETI eGalaxy touchscreen driver
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* \author Stefan Kalkowski
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* \date 2013-03-15
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*/
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/*
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* Copyright (C) 2013-2015 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _EGALAX_TS_H_
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#define _EGALAX_TS_H_
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/* Genode includes */
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#include <drivers/board_base.h>
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#include <os/attached_io_mem_dataspace.h>
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#include <input/event_queue.h>
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#include <input/event.h>
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#include <input/keycodes.h>
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/* local includes */
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#include <i2c.h>
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namespace Input {
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class Touchscreen;
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}
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class Input::Touchscreen {
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private:
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enum I2c_addresses { I2C_ADDR = 0x4 };
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enum Finger_state { PRESSED, RELEASED };
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Irq_handler _irq_handler;
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Genode::Attached_io_mem_dataspace _i2c_ds;
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I2c::I2c _i2c;
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Genode::uint8_t _buf[10];
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Finger_state _state;
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public:
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Touchscreen(Server::Entrypoint &ep)
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:
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_irq_handler(ep, Genode::Board_base::I2C_3_IRQ),
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_i2c_ds(Genode::Board_base::I2C_3_BASE,
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Genode::Board_base::I2C_3_SIZE),
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_i2c((Genode::addr_t)_i2c_ds.local_addr<void>(),
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_irq_handler),
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_state(RELEASED)
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{
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/* ask for touchscreen firmware version */
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Genode::uint8_t cmd[10] = { 0x03, 0x03, 0xa, 0x01, 0x41 };
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_i2c.send(I2C_ADDR, cmd, sizeof(cmd));
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}
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void event(Event_queue &ev_queue)
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{
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_i2c.recv(I2C_ADDR, _buf, sizeof(_buf));
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/* ignore all events except of multitouch*/
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if (_buf[0] != 4)
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return;
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int x = (_buf[3] << 8) | _buf[2];
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int y = (_buf[5] << 8) | _buf[4];
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Genode::uint8_t state = _buf[1];
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bool valid = state & (1 << 7);
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int id = (state >> 2) & 0xf;
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int down = state & 1;
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if (!valid || id > 5)
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return; /* invalid point */
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x = 102400 / (3276700 / x);
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y = 76800 / (3276700 / y);
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/* motion event */
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ev_queue.add(Input::Event(Input::Event::MOTION, 0, x, y, 0, 0));
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/* button event */
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if ((down && (_state == RELEASED)) ||
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(!down && (_state == PRESSED))) {
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ev_queue.add(Input::Event(down ? Input::Event::PRESS
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: Input::Event::RELEASE,
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Input::BTN_LEFT, 0, 0, 0, 0));
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_state = down ? PRESSED : RELEASED;
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}
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}
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};
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#endif /* _EGALAX_TS_H_ */
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