302 lines
7.8 KiB
C
302 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 10/16/2005 Tilman Kranz <tilde@tk-sls.de>
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* Creative Audio MIDI, for the CA0106 Driver
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* Version: 0.0.1
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*
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* Changelog:
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* Implementation is based on mpu401 and emu10k1x and
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* tested with ca0106.
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* mpu401: Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* emu10k1x: Copyright (c) by Francisco Moraes <fmoraes@nc.rr.com>
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*/
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#include <linux/spinlock.h>
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#include <sound/core.h>
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#include <sound/rawmidi.h>
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#include "ca_midi.h"
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#define ca_midi_write_data(midi, data) midi->write(midi, data, 0)
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#define ca_midi_write_cmd(midi, data) midi->write(midi, data, 1)
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#define ca_midi_read_data(midi) midi->read(midi, 0)
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#define ca_midi_read_stat(midi) midi->read(midi, 1)
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#define ca_midi_input_avail(midi) (!(ca_midi_read_stat(midi) & midi->input_avail))
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#define ca_midi_output_ready(midi) (!(ca_midi_read_stat(midi) & midi->output_ready))
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static void ca_midi_clear_rx(struct snd_ca_midi *midi)
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{
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int timeout = 100000;
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for (; timeout > 0 && ca_midi_input_avail(midi); timeout--)
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ca_midi_read_data(midi);
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#ifdef CONFIG_SND_DEBUG
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if (timeout <= 0)
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pr_err("ca_midi_clear_rx: timeout (status = 0x%x)\n",
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ca_midi_read_stat(midi));
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#endif
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}
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static void ca_midi_interrupt(struct snd_ca_midi *midi, unsigned int status)
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{
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unsigned char byte;
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if (midi->rmidi == NULL) {
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midi->interrupt_disable(midi,midi->tx_enable | midi->rx_enable);
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return;
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}
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spin_lock(&midi->input_lock);
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if ((status & midi->ipr_rx) && ca_midi_input_avail(midi)) {
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if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
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ca_midi_clear_rx(midi);
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} else {
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byte = ca_midi_read_data(midi);
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if(midi->substream_input)
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snd_rawmidi_receive(midi->substream_input, &byte, 1);
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}
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}
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spin_unlock(&midi->input_lock);
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spin_lock(&midi->output_lock);
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if ((status & midi->ipr_tx) && ca_midi_output_ready(midi)) {
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if (midi->substream_output &&
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snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
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ca_midi_write_data(midi, byte);
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} else {
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midi->interrupt_disable(midi,midi->tx_enable);
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}
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}
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spin_unlock(&midi->output_lock);
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}
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static void ca_midi_cmd(struct snd_ca_midi *midi, unsigned char cmd, int ack)
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{
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unsigned long flags;
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int timeout, ok;
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spin_lock_irqsave(&midi->input_lock, flags);
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ca_midi_write_data(midi, 0x00);
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/* ca_midi_clear_rx(midi); */
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ca_midi_write_cmd(midi, cmd);
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if (ack) {
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ok = 0;
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timeout = 10000;
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while (!ok && timeout-- > 0) {
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if (ca_midi_input_avail(midi)) {
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if (ca_midi_read_data(midi) == midi->ack)
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ok = 1;
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}
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}
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if (!ok && ca_midi_read_data(midi) == midi->ack)
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ok = 1;
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} else {
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ok = 1;
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}
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spin_unlock_irqrestore(&midi->input_lock, flags);
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if (!ok)
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pr_err("ca_midi_cmd: 0x%x failed at 0x%x (status = 0x%x, data = 0x%x)!!!\n",
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cmd,
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midi->get_dev_id_port(midi->dev_id),
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ca_midi_read_stat(midi),
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ca_midi_read_data(midi));
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}
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static int ca_midi_input_open(struct snd_rawmidi_substream *substream)
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{
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struct snd_ca_midi *midi = substream->rmidi->private_data;
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unsigned long flags;
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if (snd_BUG_ON(!midi->dev_id))
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return -ENXIO;
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spin_lock_irqsave(&midi->open_lock, flags);
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midi->midi_mode |= CA_MIDI_MODE_INPUT;
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midi->substream_input = substream;
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if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
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spin_unlock_irqrestore(&midi->open_lock, flags);
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ca_midi_cmd(midi, midi->reset, 1);
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ca_midi_cmd(midi, midi->enter_uart, 1);
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} else {
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spin_unlock_irqrestore(&midi->open_lock, flags);
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}
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return 0;
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}
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static int ca_midi_output_open(struct snd_rawmidi_substream *substream)
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{
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struct snd_ca_midi *midi = substream->rmidi->private_data;
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unsigned long flags;
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if (snd_BUG_ON(!midi->dev_id))
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return -ENXIO;
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spin_lock_irqsave(&midi->open_lock, flags);
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midi->midi_mode |= CA_MIDI_MODE_OUTPUT;
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midi->substream_output = substream;
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if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
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spin_unlock_irqrestore(&midi->open_lock, flags);
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ca_midi_cmd(midi, midi->reset, 1);
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ca_midi_cmd(midi, midi->enter_uart, 1);
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} else {
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spin_unlock_irqrestore(&midi->open_lock, flags);
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}
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return 0;
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}
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static int ca_midi_input_close(struct snd_rawmidi_substream *substream)
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{
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struct snd_ca_midi *midi = substream->rmidi->private_data;
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unsigned long flags;
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if (snd_BUG_ON(!midi->dev_id))
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return -ENXIO;
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spin_lock_irqsave(&midi->open_lock, flags);
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midi->interrupt_disable(midi,midi->rx_enable);
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midi->midi_mode &= ~CA_MIDI_MODE_INPUT;
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midi->substream_input = NULL;
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if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
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spin_unlock_irqrestore(&midi->open_lock, flags);
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ca_midi_cmd(midi, midi->reset, 0);
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} else {
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spin_unlock_irqrestore(&midi->open_lock, flags);
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}
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return 0;
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}
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static int ca_midi_output_close(struct snd_rawmidi_substream *substream)
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{
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struct snd_ca_midi *midi = substream->rmidi->private_data;
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unsigned long flags;
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if (snd_BUG_ON(!midi->dev_id))
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return -ENXIO;
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spin_lock_irqsave(&midi->open_lock, flags);
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midi->interrupt_disable(midi,midi->tx_enable);
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midi->midi_mode &= ~CA_MIDI_MODE_OUTPUT;
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midi->substream_output = NULL;
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if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
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spin_unlock_irqrestore(&midi->open_lock, flags);
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ca_midi_cmd(midi, midi->reset, 0);
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} else {
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spin_unlock_irqrestore(&midi->open_lock, flags);
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}
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return 0;
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}
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static void ca_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
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{
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struct snd_ca_midi *midi = substream->rmidi->private_data;
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if (snd_BUG_ON(!midi->dev_id))
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return;
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if (up) {
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midi->interrupt_enable(midi,midi->rx_enable);
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} else {
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midi->interrupt_disable(midi, midi->rx_enable);
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}
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}
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static void ca_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
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{
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struct snd_ca_midi *midi = substream->rmidi->private_data;
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unsigned long flags;
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if (snd_BUG_ON(!midi->dev_id))
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return;
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if (up) {
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int max = 4;
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unsigned char byte;
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spin_lock_irqsave(&midi->output_lock, flags);
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/* try to send some amount of bytes here before interrupts */
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while (max > 0) {
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if (ca_midi_output_ready(midi)) {
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if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT) ||
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snd_rawmidi_transmit(substream, &byte, 1) != 1) {
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/* no more data */
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spin_unlock_irqrestore(&midi->output_lock, flags);
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return;
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}
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ca_midi_write_data(midi, byte);
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max--;
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} else {
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break;
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}
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}
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spin_unlock_irqrestore(&midi->output_lock, flags);
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midi->interrupt_enable(midi,midi->tx_enable);
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} else {
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midi->interrupt_disable(midi,midi->tx_enable);
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}
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}
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static const struct snd_rawmidi_ops ca_midi_output =
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{
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.open = ca_midi_output_open,
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.close = ca_midi_output_close,
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.trigger = ca_midi_output_trigger,
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};
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static const struct snd_rawmidi_ops ca_midi_input =
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{
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.open = ca_midi_input_open,
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.close = ca_midi_input_close,
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.trigger = ca_midi_input_trigger,
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};
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static void ca_midi_free(struct snd_ca_midi *midi)
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{
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midi->interrupt = NULL;
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midi->interrupt_enable = NULL;
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midi->interrupt_disable = NULL;
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midi->read = NULL;
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midi->write = NULL;
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midi->get_dev_id_card = NULL;
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midi->get_dev_id_port = NULL;
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midi->rmidi = NULL;
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}
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static void ca_rmidi_free(struct snd_rawmidi *rmidi)
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{
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ca_midi_free(rmidi->private_data);
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}
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int ca_midi_init(void *dev_id, struct snd_ca_midi *midi, int device, char *name)
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{
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struct snd_rawmidi *rmidi;
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int err;
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if ((err = snd_rawmidi_new(midi->get_dev_id_card(midi->dev_id), name, device, 1, 1, &rmidi)) < 0)
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return err;
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midi->dev_id = dev_id;
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midi->interrupt = ca_midi_interrupt;
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spin_lock_init(&midi->open_lock);
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spin_lock_init(&midi->input_lock);
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spin_lock_init(&midi->output_lock);
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strcpy(rmidi->name, name);
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &ca_midi_output);
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &ca_midi_input);
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rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
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SNDRV_RAWMIDI_INFO_INPUT |
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SNDRV_RAWMIDI_INFO_DUPLEX;
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rmidi->private_data = midi;
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rmidi->private_free = ca_rmidi_free;
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midi->rmidi = rmidi;
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return 0;
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}
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