diff options
Diffstat (limited to 'sound/pci/emu10k1/emumpu401.c')
| -rw-r--r-- | sound/pci/emu10k1/emumpu401.c | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/sound/pci/emu10k1/emumpu401.c b/sound/pci/emu10k1/emumpu401.c new file mode 100644 index 000000000..b62c95150 --- /dev/null +++ b/sound/pci/emu10k1/emumpu401.c @@ -0,0 +1,384 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + * Routines for control of EMU10K1 MPU-401 in UART mode + */ + +#include <linux/time.h> +#include <linux/init.h> +#include <sound/core.h> +#include <sound/emu10k1.h> + +#define EMU10K1_MIDI_MODE_INPUT (1<<0) +#define EMU10K1_MIDI_MODE_OUTPUT (1<<1) + +static inline unsigned char mpu401_read(struct snd_emu10k1 *emu, + struct snd_emu10k1_midi *mpu, int idx) +{ + if (emu->audigy) + return (unsigned char)snd_emu10k1_ptr_read(emu, mpu->port + idx, 0); + else + return inb(emu->port + mpu->port + idx); +} + +static inline void mpu401_write(struct snd_emu10k1 *emu, + struct snd_emu10k1_midi *mpu, int data, int idx) +{ + if (emu->audigy) + snd_emu10k1_ptr_write(emu, mpu->port + idx, 0, data); + else + outb(data, emu->port + mpu->port + idx); +} + +#define mpu401_write_data(emu, mpu, data) mpu401_write(emu, mpu, data, 0) +#define mpu401_write_cmd(emu, mpu, data) mpu401_write(emu, mpu, data, 1) +#define mpu401_read_data(emu, mpu) mpu401_read(emu, mpu, 0) +#define mpu401_read_stat(emu, mpu) mpu401_read(emu, mpu, 1) + +#define mpu401_input_avail(emu,mpu) (!(mpu401_read_stat(emu,mpu) & 0x80)) +#define mpu401_output_ready(emu,mpu) (!(mpu401_read_stat(emu,mpu) & 0x40)) + +#define MPU401_RESET 0xff +#define MPU401_ENTER_UART 0x3f +#define MPU401_ACK 0xfe + +static void mpu401_clear_rx(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *mpu) +{ + int timeout = 100000; + for (; timeout > 0 && mpu401_input_avail(emu, mpu); timeout--) + mpu401_read_data(emu, mpu); +#ifdef CONFIG_SND_DEBUG + if (timeout <= 0) + dev_err(emu->card->dev, + "cmd: clear rx timeout (status = 0x%x)\n", + mpu401_read_stat(emu, mpu)); +#endif +} + +/* + + */ + +static void do_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *midi, unsigned int status) +{ + unsigned char byte; + + if (midi->rmidi == NULL) { + snd_emu10k1_intr_disable(emu, midi->tx_enable | midi->rx_enable); + return; + } + + spin_lock(&midi->input_lock); + if ((status & midi->ipr_rx) && mpu401_input_avail(emu, midi)) { + if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) { + mpu401_clear_rx(emu, midi); + } else { + byte = mpu401_read_data(emu, midi); + if (midi->substream_input) + snd_rawmidi_receive(midi->substream_input, &byte, 1); + } + } + spin_unlock(&midi->input_lock); + + spin_lock(&midi->output_lock); + if ((status & midi->ipr_tx) && mpu401_output_ready(emu, midi)) { + if (midi->substream_output && + snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) { + mpu401_write_data(emu, midi, byte); + } else { + snd_emu10k1_intr_disable(emu, midi->tx_enable); + } + } + spin_unlock(&midi->output_lock); +} + +static void snd_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, unsigned int status) +{ + do_emu10k1_midi_interrupt(emu, &emu->midi, status); +} + +static void snd_emu10k1_midi_interrupt2(struct snd_emu10k1 *emu, unsigned int status) +{ + do_emu10k1_midi_interrupt(emu, &emu->midi2, status); +} + +static int snd_emu10k1_midi_cmd(struct snd_emu10k1 * emu, struct snd_emu10k1_midi *midi, unsigned char cmd, int ack) +{ + unsigned long flags; + int timeout, ok; + + spin_lock_irqsave(&midi->input_lock, flags); + mpu401_write_data(emu, midi, 0x00); + /* mpu401_clear_rx(emu, midi); */ + + mpu401_write_cmd(emu, midi, cmd); + if (ack) { + ok = 0; + timeout = 10000; + while (!ok && timeout-- > 0) { + if (mpu401_input_avail(emu, midi)) { + if (mpu401_read_data(emu, midi) == MPU401_ACK) + ok = 1; + } + } + if (!ok && mpu401_read_data(emu, midi) == MPU401_ACK) + ok = 1; + } else { + ok = 1; + } + spin_unlock_irqrestore(&midi->input_lock, flags); + if (!ok) { + dev_err(emu->card->dev, + "midi_cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)!!!\n", + cmd, emu->port, + mpu401_read_stat(emu, midi), + mpu401_read_data(emu, midi)); + return 1; + } + return 0; +} + +static int snd_emu10k1_midi_input_open(struct snd_rawmidi_substream *substream) +{ + struct snd_emu10k1 *emu; + struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; + unsigned long flags; + + emu = midi->emu; + if (snd_BUG_ON(!emu)) + return -ENXIO; + spin_lock_irqsave(&midi->open_lock, flags); + midi->midi_mode |= EMU10K1_MIDI_MODE_INPUT; + midi->substream_input = substream; + if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) { + spin_unlock_irqrestore(&midi->open_lock, flags); + if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1)) + goto error_out; + if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1)) + goto error_out; + } else { + spin_unlock_irqrestore(&midi->open_lock, flags); + } + return 0; + +error_out: + return -EIO; +} + +static int snd_emu10k1_midi_output_open(struct snd_rawmidi_substream *substream) +{ + struct snd_emu10k1 *emu; + struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; + unsigned long flags; + + emu = midi->emu; + if (snd_BUG_ON(!emu)) + return -ENXIO; + spin_lock_irqsave(&midi->open_lock, flags); + midi->midi_mode |= EMU10K1_MIDI_MODE_OUTPUT; + midi->substream_output = substream; + if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) { + spin_unlock_irqrestore(&midi->open_lock, flags); + if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1)) + goto error_out; + if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1)) + goto error_out; + } else { + spin_unlock_irqrestore(&midi->open_lock, flags); + } + return 0; + +error_out: + return -EIO; +} + +static int snd_emu10k1_midi_input_close(struct snd_rawmidi_substream *substream) +{ + struct snd_emu10k1 *emu; + struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; + unsigned long flags; + int err = 0; + + emu = midi->emu; + if (snd_BUG_ON(!emu)) + return -ENXIO; + spin_lock_irqsave(&midi->open_lock, flags); + snd_emu10k1_intr_disable(emu, midi->rx_enable); + midi->midi_mode &= ~EMU10K1_MIDI_MODE_INPUT; + midi->substream_input = NULL; + if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) { + spin_unlock_irqrestore(&midi->open_lock, flags); + err = snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 0); + } else { + spin_unlock_irqrestore(&midi->open_lock, flags); + } + return err; +} + +static int snd_emu10k1_midi_output_close(struct snd_rawmidi_substream *substream) +{ + struct snd_emu10k1 *emu; + struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; + unsigned long flags; + int err = 0; + + emu = midi->emu; + if (snd_BUG_ON(!emu)) + return -ENXIO; + spin_lock_irqsave(&midi->open_lock, flags); + snd_emu10k1_intr_disable(emu, midi->tx_enable); + midi->midi_mode &= ~EMU10K1_MIDI_MODE_OUTPUT; + midi->substream_output = NULL; + if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) { + spin_unlock_irqrestore(&midi->open_lock, flags); + err = snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 0); + } else { + spin_unlock_irqrestore(&midi->open_lock, flags); + } + return err; +} + +static void snd_emu10k1_midi_input_trigger(struct snd_rawmidi_substream *substream, int up) +{ + struct snd_emu10k1 *emu; + struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; + emu = midi->emu; + if (snd_BUG_ON(!emu)) + return; + + if (up) + snd_emu10k1_intr_enable(emu, midi->rx_enable); + else + snd_emu10k1_intr_disable(emu, midi->rx_enable); +} + +static void snd_emu10k1_midi_output_trigger(struct snd_rawmidi_substream *substream, int up) +{ + struct snd_emu10k1 *emu; + struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data; + unsigned long flags; + + emu = midi->emu; + if (snd_BUG_ON(!emu)) + return; + + if (up) { + int max = 4; + unsigned char byte; + + /* try to send some amount of bytes here before interrupts */ + spin_lock_irqsave(&midi->output_lock, flags); + while (max > 0) { + if (mpu401_output_ready(emu, midi)) { + if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT) || + snd_rawmidi_transmit(substream, &byte, 1) != 1) { + /* no more data */ + spin_unlock_irqrestore(&midi->output_lock, flags); + return; + } + mpu401_write_data(emu, midi, byte); + max--; + } else { + break; + } + } + spin_unlock_irqrestore(&midi->output_lock, flags); + snd_emu10k1_intr_enable(emu, midi->tx_enable); + } else { + snd_emu10k1_intr_disable(emu, midi->tx_enable); + } +} + +/* + + */ + +static const struct snd_rawmidi_ops snd_emu10k1_midi_output = +{ + .open = snd_emu10k1_midi_output_open, + .close = snd_emu10k1_midi_output_close, + .trigger = snd_emu10k1_midi_output_trigger, +}; + +static const struct snd_rawmidi_ops snd_emu10k1_midi_input = +{ + .open = snd_emu10k1_midi_input_open, + .close = snd_emu10k1_midi_input_close, + .trigger = snd_emu10k1_midi_input_trigger, +}; + +static void snd_emu10k1_midi_free(struct snd_rawmidi *rmidi) +{ + struct snd_emu10k1_midi *midi = rmidi->private_data; + midi->interrupt = NULL; + midi->rmidi = NULL; +} + +static int emu10k1_midi_init(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *midi, int device, char *name) +{ + struct snd_rawmidi *rmidi; + int err; + + if ((err = snd_rawmidi_new(emu->card, name, device, 1, 1, &rmidi)) < 0) + return err; + midi->emu = emu; + spin_lock_init(&midi->open_lock); + spin_lock_init(&midi->input_lock); + spin_lock_init(&midi->output_lock); + strcpy(rmidi->name, name); + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_emu10k1_midi_output); + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_emu10k1_midi_input); + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | + SNDRV_RAWMIDI_INFO_INPUT | + SNDRV_RAWMIDI_INFO_DUPLEX; + rmidi->private_data = midi; + rmidi->private_free = snd_emu10k1_midi_free; + midi->rmidi = rmidi; + return 0; +} + +int snd_emu10k1_midi(struct snd_emu10k1 *emu) +{ + struct snd_emu10k1_midi *midi = &emu->midi; + int err; + + if ((err = emu10k1_midi_init(emu, midi, 0, "EMU10K1 MPU-401 (UART)")) < 0) + return err; + + midi->tx_enable = INTE_MIDITXENABLE; + midi->rx_enable = INTE_MIDIRXENABLE; + midi->port = MUDATA; + midi->ipr_tx = IPR_MIDITRANSBUFEMPTY; + midi->ipr_rx = IPR_MIDIRECVBUFEMPTY; + midi->interrupt = snd_emu10k1_midi_interrupt; + return 0; +} + +int snd_emu10k1_audigy_midi(struct snd_emu10k1 *emu) +{ + struct snd_emu10k1_midi *midi; + int err; + + midi = &emu->midi; + if ((err = emu10k1_midi_init(emu, midi, 0, "Audigy MPU-401 (UART)")) < 0) + return err; + + midi->tx_enable = INTE_MIDITXENABLE; + midi->rx_enable = INTE_MIDIRXENABLE; + midi->port = A_MUDATA1; + midi->ipr_tx = IPR_MIDITRANSBUFEMPTY; + midi->ipr_rx = IPR_MIDIRECVBUFEMPTY; + midi->interrupt = snd_emu10k1_midi_interrupt; + + midi = &emu->midi2; + if ((err = emu10k1_midi_init(emu, midi, 1, "Audigy MPU-401 #2")) < 0) + return err; + + midi->tx_enable = INTE_A_MIDITXENABLE2; + midi->rx_enable = INTE_A_MIDIRXENABLE2; + midi->port = A_MUDATA2; + midi->ipr_tx = IPR_A_MIDITRANSBUFEMPTY2; + midi->ipr_rx = IPR_A_MIDIRECVBUFEMPTY2; + midi->interrupt = snd_emu10k1_midi_interrupt2; + return 0; +} |