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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midi.c (3849B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *   Copyright (c) 2006,2007 Daniel Mack
      4*/
      5
      6#include <linux/device.h>
      7#include <linux/usb.h>
      8#include <linux/gfp.h>
      9#include <sound/rawmidi.h>
     10#include <sound/core.h>
     11#include <sound/pcm.h>
     12
     13#include "device.h"
     14#include "midi.h"
     15
     16static int snd_usb_caiaq_midi_input_open(struct snd_rawmidi_substream *substream)
     17{
     18	return 0;
     19}
     20
     21static int snd_usb_caiaq_midi_input_close(struct snd_rawmidi_substream *substream)
     22{
     23	return 0;
     24}
     25
     26static void snd_usb_caiaq_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
     27{
     28	struct snd_usb_caiaqdev *cdev = substream->rmidi->private_data;
     29
     30	if (!cdev)
     31		return;
     32
     33	cdev->midi_receive_substream = up ? substream : NULL;
     34}
     35
     36
     37static int snd_usb_caiaq_midi_output_open(struct snd_rawmidi_substream *substream)
     38{
     39	return 0;
     40}
     41
     42static int snd_usb_caiaq_midi_output_close(struct snd_rawmidi_substream *substream)
     43{
     44	struct snd_usb_caiaqdev *cdev = substream->rmidi->private_data;
     45	if (cdev->midi_out_active) {
     46		usb_kill_urb(&cdev->midi_out_urb);
     47		cdev->midi_out_active = 0;
     48	}
     49	return 0;
     50}
     51
     52static void snd_usb_caiaq_midi_send(struct snd_usb_caiaqdev *cdev,
     53				    struct snd_rawmidi_substream *substream)
     54{
     55	int len, ret;
     56	struct device *dev = caiaqdev_to_dev(cdev);
     57
     58	cdev->midi_out_buf[0] = EP1_CMD_MIDI_WRITE;
     59	cdev->midi_out_buf[1] = 0; /* port */
     60	len = snd_rawmidi_transmit(substream, cdev->midi_out_buf + 3,
     61				   EP1_BUFSIZE - 3);
     62
     63	if (len <= 0)
     64		return;
     65
     66	cdev->midi_out_buf[2] = len;
     67	cdev->midi_out_urb.transfer_buffer_length = len+3;
     68
     69	ret = usb_submit_urb(&cdev->midi_out_urb, GFP_ATOMIC);
     70	if (ret < 0)
     71		dev_err(dev,
     72			"snd_usb_caiaq_midi_send(%p): usb_submit_urb() failed,"
     73			"ret=%d, len=%d\n", substream, ret, len);
     74	else
     75		cdev->midi_out_active = 1;
     76}
     77
     78static void snd_usb_caiaq_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
     79{
     80	struct snd_usb_caiaqdev *cdev = substream->rmidi->private_data;
     81
     82	if (up) {
     83		cdev->midi_out_substream = substream;
     84		if (!cdev->midi_out_active)
     85			snd_usb_caiaq_midi_send(cdev, substream);
     86	} else {
     87		cdev->midi_out_substream = NULL;
     88	}
     89}
     90
     91
     92static const struct snd_rawmidi_ops snd_usb_caiaq_midi_output =
     93{
     94	.open =		snd_usb_caiaq_midi_output_open,
     95	.close =	snd_usb_caiaq_midi_output_close,
     96	.trigger =      snd_usb_caiaq_midi_output_trigger,
     97};
     98
     99static const struct snd_rawmidi_ops snd_usb_caiaq_midi_input =
    100{
    101	.open =		snd_usb_caiaq_midi_input_open,
    102	.close =	snd_usb_caiaq_midi_input_close,
    103	.trigger =      snd_usb_caiaq_midi_input_trigger,
    104};
    105
    106void snd_usb_caiaq_midi_handle_input(struct snd_usb_caiaqdev *cdev,
    107				     int port, const char *buf, int len)
    108{
    109	if (!cdev->midi_receive_substream)
    110		return;
    111
    112	snd_rawmidi_receive(cdev->midi_receive_substream, buf, len);
    113}
    114
    115int snd_usb_caiaq_midi_init(struct snd_usb_caiaqdev *device)
    116{
    117	int ret;
    118	struct snd_rawmidi *rmidi;
    119
    120	ret = snd_rawmidi_new(device->chip.card, device->product_name, 0,
    121					device->spec.num_midi_out,
    122					device->spec.num_midi_in,
    123					&rmidi);
    124
    125	if (ret < 0)
    126		return ret;
    127
    128	strscpy(rmidi->name, device->product_name, sizeof(rmidi->name));
    129
    130	rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX;
    131	rmidi->private_data = device;
    132
    133	if (device->spec.num_midi_out > 0) {
    134		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
    135		snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
    136				    &snd_usb_caiaq_midi_output);
    137	}
    138
    139	if (device->spec.num_midi_in > 0) {
    140		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
    141		snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
    142				    &snd_usb_caiaq_midi_input);
    143	}
    144
    145	device->rmidi = rmidi;
    146
    147	return 0;
    148}
    149
    150void snd_usb_caiaq_midi_output_done(struct urb* urb)
    151{
    152	struct snd_usb_caiaqdev *cdev = urb->context;
    153
    154	cdev->midi_out_active = 0;
    155	if (urb->status != 0)
    156		return;
    157
    158	if (!cdev->midi_out_substream)
    159		return;
    160
    161	snd_usb_caiaq_midi_send(cdev, cdev->midi_out_substream);
    162}