106 lines
2.7 KiB
C++
106 lines
2.7 KiB
C++
/*
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* \brief Freescale MPR121 capacitative button 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 _MPR121_H_
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#define _MPR121_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 Buttons;
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}
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class Input::Buttons {
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private:
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enum {
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I2C_ADDR = 0x5a,
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};
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enum Events {
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RELEASE = 0,
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BACK = 1,
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HOME = 2,
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MENU = 4,
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POWER = 8,
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};
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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 _state;
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public:
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Buttons(Server::Entrypoint &ep) :
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_irq_handler(ep, Genode::Board_base::I2C_2_IRQ),
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_i2c_ds(Genode::Board_base::I2C_2_BASE,
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Genode::Board_base::I2C_2_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(0)
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{
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static Genode::uint8_t init_cmd[][2] = {
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{0x41, 0x8 }, {0x42, 0x5 }, {0x43, 0x8 },
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{0x44, 0x5 }, {0x45, 0x8 }, {0x46, 0x5 },
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{0x47, 0x8 }, {0x48, 0x5 }, {0x49, 0x8 },
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{0x4a, 0x5 }, {0x4b, 0x8 }, {0x4c, 0x5 },
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{0x4d, 0x8 }, {0x4e, 0x5 }, {0x4f, 0x8 },
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{0x50, 0x5 }, {0x51, 0x8 }, {0x52, 0x5 },
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{0x53, 0x8 }, {0x54, 0x5 }, {0x55, 0x8 },
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{0x56, 0x5 }, {0x57, 0x8 }, {0x58, 0x5 },
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{0x59, 0x8 }, {0x5a, 0x5 }, {0x2b, 0x1 },
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{0x2c, 0x1 }, {0x2d, 0x0 }, {0x2e, 0x0 },
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{0x2f, 0x1 }, {0x30, 0x1 }, {0x31, 0xff},
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{0x32, 0x2 }, {0x5d, 0x4 }, {0x5c, 0xb },
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{0x7b, 0xb }, {0x7d, 0xc9}, {0x7e, 0x82},
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{0x7f, 0xb4}, {0x5e, 0x84}};
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/* initialize mpr121 touch button device */
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for (unsigned i = 0; i < sizeof(init_cmd)/2; i++)
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_i2c.send(I2C_ADDR, init_cmd[i], 2);
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}
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void event(Event_queue &ev_queue)
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{
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int buttons[] = { BACK, HOME, MENU, POWER };
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int codes[] = { Input::KEY_BACK, Input::KEY_HOME,
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Input::KEY_MENU, Input::KEY_POWER};
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Genode::uint8_t buf = 0;
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_i2c.send(I2C_ADDR, &buf, 1);
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_i2c.recv(I2C_ADDR, &buf, 1);
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for (unsigned i = 0; i < (sizeof(buttons)/sizeof(int)); i++) {
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if ((_state & buttons[i]) == (buf & buttons[i]))
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continue;
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Input::Event::Type event = (buf & buttons[i]) ?
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Input::Event::PRESS : Input::Event::RELEASE;
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ev_queue.add(Input::Event(event, codes[i], 0, 0, 0, 0));
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};
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_state = buf;
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}
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};
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#endif /* _MPR121_H_ */
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