cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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motu-midi.c (3267B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * motu-midi.h - a part of driver for MOTU FireWire series
      4 *
      5 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
      6 */
      7#include "motu.h"
      8
      9static int midi_open(struct snd_rawmidi_substream *substream)
     10{
     11	struct snd_motu *motu = substream->rmidi->private_data;
     12	int err;
     13
     14	err = snd_motu_stream_lock_try(motu);
     15	if (err < 0)
     16		return err;
     17
     18	mutex_lock(&motu->mutex);
     19
     20	err = snd_motu_stream_reserve_duplex(motu, 0, 0, 0);
     21	if (err >= 0) {
     22		++motu->substreams_counter;
     23		err = snd_motu_stream_start_duplex(motu);
     24		if (err < 0)
     25			--motu->substreams_counter;
     26	}
     27
     28	mutex_unlock(&motu->mutex);
     29
     30	if (err < 0)
     31		snd_motu_stream_lock_release(motu);
     32
     33	return err;
     34}
     35
     36static int midi_close(struct snd_rawmidi_substream *substream)
     37{
     38	struct snd_motu *motu = substream->rmidi->private_data;
     39
     40	mutex_lock(&motu->mutex);
     41
     42	--motu->substreams_counter;
     43	snd_motu_stream_stop_duplex(motu);
     44
     45	mutex_unlock(&motu->mutex);
     46
     47	snd_motu_stream_lock_release(motu);
     48	return 0;
     49}
     50
     51static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
     52{
     53	struct snd_motu *motu = substrm->rmidi->private_data;
     54	unsigned long flags;
     55
     56	spin_lock_irqsave(&motu->lock, flags);
     57
     58	if (up)
     59		amdtp_motu_midi_trigger(&motu->tx_stream, substrm->number,
     60					substrm);
     61	else
     62		amdtp_motu_midi_trigger(&motu->tx_stream, substrm->number,
     63					NULL);
     64
     65	spin_unlock_irqrestore(&motu->lock, flags);
     66}
     67
     68static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
     69{
     70	struct snd_motu *motu = substrm->rmidi->private_data;
     71	unsigned long flags;
     72
     73	spin_lock_irqsave(&motu->lock, flags);
     74
     75	if (up)
     76		amdtp_motu_midi_trigger(&motu->rx_stream, substrm->number,
     77					substrm);
     78	else
     79		amdtp_motu_midi_trigger(&motu->rx_stream, substrm->number,
     80					NULL);
     81
     82	spin_unlock_irqrestore(&motu->lock, flags);
     83}
     84
     85static void set_midi_substream_names(struct snd_motu *motu,
     86				     struct snd_rawmidi_str *str)
     87{
     88	struct snd_rawmidi_substream *subs;
     89
     90	list_for_each_entry(subs, &str->substreams, list) {
     91		snprintf(subs->name, sizeof(subs->name),
     92			 "%s MIDI %d", motu->card->shortname, subs->number + 1);
     93	}
     94}
     95
     96int snd_motu_create_midi_devices(struct snd_motu *motu)
     97{
     98	static const struct snd_rawmidi_ops capture_ops = {
     99		.open		= midi_open,
    100		.close		= midi_close,
    101		.trigger	= midi_capture_trigger,
    102	};
    103	static const struct snd_rawmidi_ops playback_ops = {
    104		.open		= midi_open,
    105		.close		= midi_close,
    106		.trigger	= midi_playback_trigger,
    107	};
    108	struct snd_rawmidi *rmidi;
    109	struct snd_rawmidi_str *str;
    110	int err;
    111
    112	/* create midi ports */
    113	err = snd_rawmidi_new(motu->card, motu->card->driver, 0, 1, 1, &rmidi);
    114	if (err < 0)
    115		return err;
    116
    117	snprintf(rmidi->name, sizeof(rmidi->name),
    118		 "%s MIDI", motu->card->shortname);
    119	rmidi->private_data = motu;
    120
    121	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT |
    122			     SNDRV_RAWMIDI_INFO_OUTPUT |
    123			     SNDRV_RAWMIDI_INFO_DUPLEX;
    124
    125	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
    126			    &capture_ops);
    127	str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
    128	set_midi_substream_names(motu, str);
    129
    130	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
    131			    &playback_ops);
    132	str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
    133	set_midi_substream_names(motu, str);
    134
    135	return 0;
    136}