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384 lines
10 KiB
384 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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* Routines for control of EMU10K1 MPU-401 in UART mode |
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*/ |
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#include <linux/time.h> |
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#include <linux/init.h> |
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#include <sound/core.h> |
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#include <sound/emu10k1.h> |
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#define EMU10K1_MIDI_MODE_INPUT (1<<0) |
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#define EMU10K1_MIDI_MODE_OUTPUT (1<<1) |
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static inline unsigned char mpu401_read(struct snd_emu10k1 *emu, |
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struct snd_emu10k1_midi *mpu, int idx) |
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{ |
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if (emu->audigy) |
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return (unsigned char)snd_emu10k1_ptr_read(emu, mpu->port + idx, 0); |
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else |
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return inb(emu->port + mpu->port + idx); |
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} |
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static inline void mpu401_write(struct snd_emu10k1 *emu, |
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struct snd_emu10k1_midi *mpu, int data, int idx) |
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{ |
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if (emu->audigy) |
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snd_emu10k1_ptr_write(emu, mpu->port + idx, 0, data); |
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else |
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outb(data, emu->port + mpu->port + idx); |
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} |
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#define mpu401_write_data(emu, mpu, data) mpu401_write(emu, mpu, data, 0) |
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#define mpu401_write_cmd(emu, mpu, data) mpu401_write(emu, mpu, data, 1) |
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#define mpu401_read_data(emu, mpu) mpu401_read(emu, mpu, 0) |
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#define mpu401_read_stat(emu, mpu) mpu401_read(emu, mpu, 1) |
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#define mpu401_input_avail(emu,mpu) (!(mpu401_read_stat(emu,mpu) & 0x80)) |
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#define mpu401_output_ready(emu,mpu) (!(mpu401_read_stat(emu,mpu) & 0x40)) |
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#define MPU401_RESET 0xff |
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#define MPU401_ENTER_UART 0x3f |
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#define MPU401_ACK 0xfe |
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static void mpu401_clear_rx(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *mpu) |
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{ |
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int timeout = 100000; |
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for (; timeout > 0 && mpu401_input_avail(emu, mpu); timeout--) |
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mpu401_read_data(emu, mpu); |
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#ifdef CONFIG_SND_DEBUG |
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if (timeout <= 0) |
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dev_err(emu->card->dev, |
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"cmd: clear rx timeout (status = 0x%x)\n", |
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mpu401_read_stat(emu, mpu)); |
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#endif |
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} |
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/* |
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*/ |
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static void do_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, struct snd_emu10k1_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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snd_emu10k1_intr_disable(emu, 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) && mpu401_input_avail(emu, midi)) { |
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if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) { |
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mpu401_clear_rx(emu, midi); |
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} else { |
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byte = mpu401_read_data(emu, 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) && mpu401_output_ready(emu, 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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mpu401_write_data(emu, midi, byte); |
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} else { |
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snd_emu10k1_intr_disable(emu, 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 snd_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, unsigned int status) |
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{ |
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do_emu10k1_midi_interrupt(emu, &emu->midi, status); |
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} |
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static void snd_emu10k1_midi_interrupt2(struct snd_emu10k1 *emu, unsigned int status) |
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{ |
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do_emu10k1_midi_interrupt(emu, &emu->midi2, status); |
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} |
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static int snd_emu10k1_midi_cmd(struct snd_emu10k1 * emu, struct snd_emu10k1_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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mpu401_write_data(emu, midi, 0x00); |
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/* mpu401_clear_rx(emu, midi); */ |
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mpu401_write_cmd(emu, 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 (mpu401_input_avail(emu, midi)) { |
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if (mpu401_read_data(emu, midi) == MPU401_ACK) |
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ok = 1; |
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} |
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} |
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if (!ok && mpu401_read_data(emu, midi) == MPU401_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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dev_err(emu->card->dev, |
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"midi_cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)!!!\n", |
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cmd, emu->port, |
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mpu401_read_stat(emu, midi), |
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mpu401_read_data(emu, midi)); |
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return 1; |
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} |
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return 0; |
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} |
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static int snd_emu10k1_midi_input_open(struct snd_rawmidi_substream *substream) |
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{ |
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struct snd_emu10k1 *emu; |
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struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; |
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unsigned long flags; |
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emu = midi->emu; |
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if (snd_BUG_ON(!emu)) |
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return -ENXIO; |
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spin_lock_irqsave(&midi->open_lock, flags); |
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midi->midi_mode |= EMU10K1_MIDI_MODE_INPUT; |
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midi->substream_input = substream; |
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if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) { |
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spin_unlock_irqrestore(&midi->open_lock, flags); |
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if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1)) |
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goto error_out; |
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if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1)) |
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goto error_out; |
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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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error_out: |
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return -EIO; |
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} |
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static int snd_emu10k1_midi_output_open(struct snd_rawmidi_substream *substream) |
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{ |
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struct snd_emu10k1 *emu; |
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struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; |
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unsigned long flags; |
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emu = midi->emu; |
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if (snd_BUG_ON(!emu)) |
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return -ENXIO; |
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spin_lock_irqsave(&midi->open_lock, flags); |
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midi->midi_mode |= EMU10K1_MIDI_MODE_OUTPUT; |
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midi->substream_output = substream; |
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if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) { |
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spin_unlock_irqrestore(&midi->open_lock, flags); |
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if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1)) |
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goto error_out; |
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if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1)) |
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goto error_out; |
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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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error_out: |
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return -EIO; |
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} |
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static int snd_emu10k1_midi_input_close(struct snd_rawmidi_substream *substream) |
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{ |
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struct snd_emu10k1 *emu; |
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struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; |
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unsigned long flags; |
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int err = 0; |
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emu = midi->emu; |
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if (snd_BUG_ON(!emu)) |
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return -ENXIO; |
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spin_lock_irqsave(&midi->open_lock, flags); |
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snd_emu10k1_intr_disable(emu, midi->rx_enable); |
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midi->midi_mode &= ~EMU10K1_MIDI_MODE_INPUT; |
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midi->substream_input = NULL; |
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if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) { |
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spin_unlock_irqrestore(&midi->open_lock, flags); |
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err = snd_emu10k1_midi_cmd(emu, midi, MPU401_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 err; |
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} |
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static int snd_emu10k1_midi_output_close(struct snd_rawmidi_substream *substream) |
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{ |
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struct snd_emu10k1 *emu; |
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struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; |
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unsigned long flags; |
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int err = 0; |
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emu = midi->emu; |
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if (snd_BUG_ON(!emu)) |
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return -ENXIO; |
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spin_lock_irqsave(&midi->open_lock, flags); |
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snd_emu10k1_intr_disable(emu, midi->tx_enable); |
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midi->midi_mode &= ~EMU10K1_MIDI_MODE_OUTPUT; |
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midi->substream_output = NULL; |
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if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) { |
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spin_unlock_irqrestore(&midi->open_lock, flags); |
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err = snd_emu10k1_midi_cmd(emu, midi, MPU401_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 err; |
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} |
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static void snd_emu10k1_midi_input_trigger(struct snd_rawmidi_substream *substream, int up) |
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{ |
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struct snd_emu10k1 *emu; |
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struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; |
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emu = midi->emu; |
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if (snd_BUG_ON(!emu)) |
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return; |
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if (up) |
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snd_emu10k1_intr_enable(emu, midi->rx_enable); |
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else |
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snd_emu10k1_intr_disable(emu, midi->rx_enable); |
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} |
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static void snd_emu10k1_midi_output_trigger(struct snd_rawmidi_substream *substream, int up) |
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{ |
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struct snd_emu10k1 *emu; |
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struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; |
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unsigned long flags; |
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emu = midi->emu; |
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if (snd_BUG_ON(!emu)) |
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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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/* try to send some amount of bytes here before interrupts */ |
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spin_lock_irqsave(&midi->output_lock, flags); |
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while (max > 0) { |
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if (mpu401_output_ready(emu, midi)) { |
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if (!(midi->midi_mode & EMU10K1_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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mpu401_write_data(emu, 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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snd_emu10k1_intr_enable(emu, midi->tx_enable); |
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} else { |
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snd_emu10k1_intr_disable(emu, midi->tx_enable); |
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} |
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} |
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/* |
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*/ |
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static const struct snd_rawmidi_ops snd_emu10k1_midi_output = |
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{ |
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.open = snd_emu10k1_midi_output_open, |
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.close = snd_emu10k1_midi_output_close, |
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.trigger = snd_emu10k1_midi_output_trigger, |
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}; |
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static const struct snd_rawmidi_ops snd_emu10k1_midi_input = |
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{ |
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.open = snd_emu10k1_midi_input_open, |
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.close = snd_emu10k1_midi_input_close, |
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.trigger = snd_emu10k1_midi_input_trigger, |
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}; |
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static void snd_emu10k1_midi_free(struct snd_rawmidi *rmidi) |
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{ |
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struct snd_emu10k1_midi *midi = rmidi->private_data; |
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midi->interrupt = NULL; |
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midi->rmidi = NULL; |
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} |
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static int emu10k1_midi_init(struct snd_emu10k1 *emu, struct snd_emu10k1_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(emu->card, name, device, 1, 1, &rmidi)) < 0) |
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return err; |
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midi->emu = emu; |
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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, &snd_emu10k1_midi_output); |
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_emu10k1_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 = snd_emu10k1_midi_free; |
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midi->rmidi = rmidi; |
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return 0; |
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} |
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int snd_emu10k1_midi(struct snd_emu10k1 *emu) |
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{ |
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struct snd_emu10k1_midi *midi = &emu->midi; |
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int err; |
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if ((err = emu10k1_midi_init(emu, midi, 0, "EMU10K1 MPU-401 (UART)")) < 0) |
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return err; |
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midi->tx_enable = INTE_MIDITXENABLE; |
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midi->rx_enable = INTE_MIDIRXENABLE; |
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midi->port = MUDATA; |
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midi->ipr_tx = IPR_MIDITRANSBUFEMPTY; |
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midi->ipr_rx = IPR_MIDIRECVBUFEMPTY; |
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midi->interrupt = snd_emu10k1_midi_interrupt; |
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return 0; |
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} |
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int snd_emu10k1_audigy_midi(struct snd_emu10k1 *emu) |
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{ |
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struct snd_emu10k1_midi *midi; |
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int err; |
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midi = &emu->midi; |
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if ((err = emu10k1_midi_init(emu, midi, 0, "Audigy MPU-401 (UART)")) < 0) |
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return err; |
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midi->tx_enable = INTE_MIDITXENABLE; |
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midi->rx_enable = INTE_MIDIRXENABLE; |
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midi->port = A_MUDATA1; |
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midi->ipr_tx = IPR_MIDITRANSBUFEMPTY; |
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midi->ipr_rx = IPR_MIDIRECVBUFEMPTY; |
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midi->interrupt = snd_emu10k1_midi_interrupt; |
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midi = &emu->midi2; |
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if ((err = emu10k1_midi_init(emu, midi, 1, "Audigy MPU-401 #2")) < 0) |
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return err; |
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midi->tx_enable = INTE_A_MIDITXENABLE2; |
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midi->rx_enable = INTE_A_MIDIRXENABLE2; |
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midi->port = A_MUDATA2; |
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midi->ipr_tx = IPR_A_MIDITRANSBUFEMPTY2; |
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midi->ipr_rx = IPR_A_MIDIRECVBUFEMPTY2; |
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midi->interrupt = snd_emu10k1_midi_interrupt2; |
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return 0; |
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}
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