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302 lines
7.8 KiB
302 lines
7.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 10/16/2005 Tilman Kranz <[email protected]> |
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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 <[email protected]> |
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* emu10k1x: Copyright (c) by Francisco Moraes <[email protected]> |
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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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err = snd_rawmidi_new(midi->get_dev_id_card(midi->dev_id), name, device, 1, 1, &rmidi); |
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if (err < 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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