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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol, Fabio Priuli
/******************************************************************************

Magnavox The Voice emulation

TODO:
- load speech ROM from softlist
- move external speech rom for S.I.D. the Spellbinder into the softlist entry

******************************************************************************/

#include "emu.h"
#include "voice.h"
#include "speaker.h"

DEFINE_DEVICE_TYPE(O2_ROM_VOICE, o2_voice_device, "o2_voice", "Odyssey 2 The Voice Passthrough Cart")

//-------------------------------------------------
//  o2_voice_device - constructor
//-------------------------------------------------

o2_voice_device::o2_voice_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, O2_ROM_VOICE, tag, owner, clock),
	device_o2_cart_interface(mconfig, *this),
	m_speech(*this, "sp0256_speech"),
	m_subslot(*this, "subslot")
{ }

void o2_voice_device::device_start()
{
	save_item(NAME(m_lrq_state));
	save_item(NAME(m_control));
}


//-------------------------------------------------
//  device_add_mconfig - add device configuration
//-------------------------------------------------

void o2_voice_device::device_add_mconfig(machine_config &config)
{
	SPEAKER(config, "mono").front_center();

	SP0256(config, m_speech, 3.12_MHz_XTAL);
	m_speech->data_request_callback().set(FUNC(o2_voice_device::lrq_callback));
	// The Voice uses a speaker with its own volume control so the relative volumes to use are subjective, these sound good
	m_speech->add_route(ALL_OUTPUTS, "mono", 1.00);

	O2_CART_SLOT(config, m_subslot, o2_cart, nullptr);
}


ROM_START( o2voice )
	ROM_REGION( 0x10000, "sp0256_speech", 0 )
	// SP0256B-019 Speech chip w/2KiB mask rom
	ROM_LOAD( "sp0256b-019.bin",  0x1000, 0x0800, CRC(4bb43724) SHA1(49f5326ad45392dc96c89d1d4e089a20bd21e609) )

	/* A note about "The Voice": Two versions of "The Voice" exist:
	   * An earlier version with eight 2KiB speech roms, spr016-??? through spr016-??? on a small daughterboard
	     <note to self: fill in numbers later>
	   * A later version with one 16KiB speech rom, spr128-003, mounted directly on the mainboard
	   The rom contents of these two versions are EXACTLY the same.
	   Both versions have an sp0256b-019 speech chip, which has 2KiB of its own internal speech data
	   Thanks to kevtris for this info. - LN
	*/

	// External 16KiB speech ROM (spr128-003) from "The Voice"
	ROM_LOAD( "spr128-003.bin",   0x4000, 0x4000, CRC(509367b5) SHA1(0f31f46bc02e9272885779a6dd7102c78b18895b) )
	// Additional External 16KiB speech ROM (spr128-004) from S.I.D. the Spellbinder
	ROM_LOAD( "spr128-004.bin",   0x8000, 0x4000, CRC(e79dfb75) SHA1(37f33d79ffd1739d7c2f226b010a1eac28d74ca0) )
ROM_END

const tiny_rom_entry *o2_voice_device::device_rom_region() const
{
	return ROM_NAME( o2voice );
}


//-------------------------------------------------
//  mapper specific handlers
//-------------------------------------------------

WRITE_LINE_MEMBER(o2_voice_device::lrq_callback)
{
	m_lrq_state = state;
}

READ_LINE_MEMBER(o2_voice_device::t0_read)
{
	// conflict with subslot T0
	int state = (m_subslot->exists()) ? m_subslot->t0_read() : 0;
	return state | (m_speech->lrq_r() ? 0 : 1);
}

void o2_voice_device::io_write(offs_t offset, u8 data)
{
	if (offset & 0x80 && ~m_control & 0x10)
	{
		// A0-A6: SP0256B A1-A7 (A8 to GND)
		// D5: 7474 to SP0256B reset
		if (data & 0x20)
			m_speech->ald_w(offset & 0x7f);
		else
			m_speech->reset();
	}

	// possible conflict with subslot IO (works ok with 4in1, not with chess)
	if (m_subslot->exists())
		m_subslot->io_write(offset, data);
}