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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dice-midi.c (3759B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * dice_midi.c - a part of driver for Dice based devices
      4 *
      5 * Copyright (c) 2014 Takashi Sakamoto
      6 */
      7#include "dice.h"
      8
      9static int midi_open(struct snd_rawmidi_substream *substream)
     10{
     11	struct snd_dice *dice = substream->rmidi->private_data;
     12	int err;
     13
     14	err = snd_dice_stream_lock_try(dice);
     15	if (err < 0)
     16		return err;
     17
     18	mutex_lock(&dice->mutex);
     19
     20	err = snd_dice_stream_reserve_duplex(dice, 0, 0, 0);
     21	if (err >= 0) {
     22		++dice->substreams_counter;
     23		err = snd_dice_stream_start_duplex(dice);
     24		if (err < 0)
     25			--dice->substreams_counter;
     26	}
     27
     28	mutex_unlock(&dice->mutex);
     29
     30	if (err < 0)
     31		snd_dice_stream_lock_release(dice);
     32
     33	return err;
     34}
     35
     36static int midi_close(struct snd_rawmidi_substream *substream)
     37{
     38	struct snd_dice *dice = substream->rmidi->private_data;
     39
     40	mutex_lock(&dice->mutex);
     41
     42	--dice->substreams_counter;
     43	snd_dice_stream_stop_duplex(dice);
     44
     45	mutex_unlock(&dice->mutex);
     46
     47	snd_dice_stream_lock_release(dice);
     48	return 0;
     49}
     50
     51static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
     52{
     53	struct snd_dice *dice = substrm->rmidi->private_data;
     54	unsigned long flags;
     55
     56	spin_lock_irqsave(&dice->lock, flags);
     57
     58	if (up)
     59		amdtp_am824_midi_trigger(&dice->tx_stream[0],
     60					  substrm->number, substrm);
     61	else
     62		amdtp_am824_midi_trigger(&dice->tx_stream[0],
     63					  substrm->number, NULL);
     64
     65	spin_unlock_irqrestore(&dice->lock, flags);
     66}
     67
     68static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
     69{
     70	struct snd_dice *dice = substrm->rmidi->private_data;
     71	unsigned long flags;
     72
     73	spin_lock_irqsave(&dice->lock, flags);
     74
     75	if (up)
     76		amdtp_am824_midi_trigger(&dice->rx_stream[0],
     77					 substrm->number, substrm);
     78	else
     79		amdtp_am824_midi_trigger(&dice->rx_stream[0],
     80					 substrm->number, NULL);
     81
     82	spin_unlock_irqrestore(&dice->lock, flags);
     83}
     84
     85static void set_midi_substream_names(struct snd_dice *dice,
     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", dice->card->shortname, subs->number + 1);
     93	}
     94}
     95
     96int snd_dice_create_midi(struct snd_dice *dice)
     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	unsigned int midi_in_ports, midi_out_ports;
    111	int i;
    112	int err;
    113
    114	midi_in_ports = 0;
    115	midi_out_ports = 0;
    116	for (i = 0; i < MAX_STREAMS; ++i) {
    117		midi_in_ports = max(midi_in_ports, dice->tx_midi_ports[i]);
    118		midi_out_ports = max(midi_out_ports, dice->rx_midi_ports[i]);
    119	}
    120
    121	if (midi_in_ports + midi_out_ports == 0)
    122		return 0;
    123
    124	/* create midi ports */
    125	err = snd_rawmidi_new(dice->card, dice->card->driver, 0,
    126			      midi_out_ports, midi_in_ports,
    127			      &rmidi);
    128	if (err < 0)
    129		return err;
    130
    131	snprintf(rmidi->name, sizeof(rmidi->name),
    132		 "%s MIDI", dice->card->shortname);
    133	rmidi->private_data = dice;
    134
    135	if (midi_in_ports > 0) {
    136		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
    137
    138		snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
    139				    &capture_ops);
    140
    141		str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
    142
    143		set_midi_substream_names(dice, str);
    144	}
    145
    146	if (midi_out_ports > 0) {
    147		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
    148
    149		snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
    150				    &playback_ops);
    151
    152		str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
    153
    154		set_midi_substream_names(dice, str);
    155	}
    156
    157	if ((midi_out_ports > 0) && (midi_in_ports > 0))
    158		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
    159
    160	return 0;
    161}