[PATCH] ALSA: msnd: Remove midi code

linux
2025-05-11T17:30:02Z

From: "Dr. David Alan Gilbert" <linux@treblig.org>

Nothing calls snd_msndmidi_new()
thus nothing sets chip->msndmidi_mpu
The call to snd_msndmidi_input_read is gated on that being set,
so snd_msndmidi_input_read() won't be called either.

This is probably a missing call to snd_msndmidi_new(), but since
this is ancient code, it's probably best to remove it (especially
since I don't have the hardware to test it).

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
---
sound/isa/msnd/Makefile | 2 +-
sound/isa/msnd/msnd.h | 4 -
sound/isa/msnd/msnd_midi.c | 163 ---------------------------------
sound/isa/msnd/msnd_pinnacle.c | 5 -
4 files changed, 1 insertion(+), 173 deletions(-)
delete mode 100644 sound/isa/msnd/msnd_midi.c

diff --git a/sound/isa/msnd/Makefile b/sound/isa/msnd/Makefile
index 5f8d6b472722..d56412aae857 100644
--- a/sound/isa/msnd/Makefile
+++ b/sound/isa/msnd/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0

-snd-msnd-lib-y := msnd.o msnd_midi.o msnd_pinnacle_mixer.o
+snd-msnd-lib-y := msnd.o msnd_pinnacle_mixer.o
snd-msnd-pinnacle-y := msnd_pinnacle.o
snd-msnd-classic-y := msnd_classic.o

diff --git a/sound/isa/msnd/msnd.h b/sound/isa/msnd/msnd.h
index 533d71cee9ba..3d7810ed9186 100644
--- a/sound/isa/msnd/msnd.h
+++ b/sound/isa/msnd/msnd.h
@@ -216,7 +216,6 @@ struct snd_msnd {
int captureLimit;
int capturePeriods;
struct snd_card *card;
- void *msndmidi_mpu;
struct snd_rawmidi *rmidi;

/* Hardware resources */
@@ -286,9 +285,6 @@ int snd_msnd_DAPQ(struct snd_msnd *chip, int start);
int snd_msnd_DARQ(struct snd_msnd *chip, int start);
int snd_msnd_pcm(struct snd_card *card, int device);

-int snd_msndmidi_new(struct snd_card *card, int device);
-void snd_msndmidi_input_read(void *mpu);
-
void snd_msndmix_setup(struct snd_msnd *chip);
int snd_msndmix_new(struct snd_card *card);
int snd_msndmix_force_recsrc(struct snd_msnd *chip, int recsrc);
diff --git a/sound/isa/msnd/msnd_midi.c b/sound/isa/msnd/msnd_midi.c
deleted file mode 100644
index 3ffc8758bec2..000000000000
--- a/sound/isa/msnd/msnd_midi.c
+++ /dev/null
@@ -1,163 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
- * Copyright (c) 2009 by Krzysztof Helt
- * Routines for control of MPU-401 in UART mode
- *
- * MPU-401 supports UART mode which is not capable generate transmit
- * interrupts thus output is done via polling. Also, if irq < 0, then
- * input is done also via polling. Do not expect good performance.
- */
-
-#include <linux/io.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/ioport.h>
-#include <linux/errno.h>
-#include <linux/export.h>
-#include <sound/core.h>
-#include <sound/rawmidi.h>
-
-#include "msnd.h"
-
-#define MSNDMIDI_MODE_BIT_INPUT 0
-#define MSNDMIDI_MODE_BIT_OUTPUT 1
-#define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2
-#define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER 3
-
-struct snd_msndmidi {
- struct snd_msnd *dev;
-
- unsigned long mode; /* MSNDMIDI_MODE_XXXX */
-
- struct snd_rawmidi_substream *substream_input;
-
- spinlock_t input_lock;
-};
-
-/*
- * input/output open/close - protected by open_mutex in rawmidi.c
- */
-static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
-{
- struct snd_msndmidi *mpu;
-
- mpu = substream->rmidi->private_data;
-
- mpu->substream_input = substream;
-
- snd_msnd_enable_irq(mpu->dev);
-
- snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
- set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
- return 0;
-}
-
-static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
-{
- struct snd_msndmidi *mpu;
-
- mpu = substream->rmidi->private_data;
- snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP);
- clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
- mpu->substream_input = NULL;
- snd_msnd_disable_irq(mpu->dev);
- return 0;
-}
-
-static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
-{
- u16 tail;
-
- tail = readw(mpu->dev->MIDQ + JQS_wTail);
- writew(tail, mpu->dev->MIDQ + JQS_wHead);
-}
-
-/*
- * trigger input
- */
-static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
- int up)
-{
- unsigned long flags;
- struct snd_msndmidi *mpu;
-
- mpu = substream->rmidi->private_data;
- spin_lock_irqsave(&mpu->input_lock, flags);
- if (up) {
- if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
- &mpu->mode))
- snd_msndmidi_input_drop(mpu);
- } else {
- clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
- }
- spin_unlock_irqrestore(&mpu->input_lock, flags);
- if (up)
- snd_msndmidi_input_read(mpu);
-}
-
-void snd_msndmidi_input_read(void *mpuv)
-{
- unsigned long flags;
- struct snd_msndmidi *mpu = mpuv;
- void __iomem *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
- u16 head, tail, size;
-
- spin_lock_irqsave(&mpu->input_lock, flags);
- head = readw(mpu->dev->MIDQ + JQS_wHead);
- tail = readw(mpu->dev->MIDQ + JQS_wTail);
- size = readw(mpu->dev->MIDQ + JQS_wSize);
- if (head > size || tail > size)
- goto out;
- while (head != tail) {
- unsigned char val = readw(pwMIDQData + 2 * head);
-
- if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
- snd_rawmidi_receive(mpu->substream_input, &val, 1);
- if (++head > size)
- head = 0;
- writew(head, mpu->dev->MIDQ + JQS_wHead);
- }
- out:
- spin_unlock_irqrestore(&mpu->input_lock, flags);
-}
-EXPORT_SYMBOL(snd_msndmidi_input_read);
-
-static const struct snd_rawmidi_ops snd_msndmidi_input = {
- .open = snd_msndmidi_input_open,
- .close = snd_msndmidi_input_close,
- .trigger = snd_msndmidi_input_trigger,
-};
-
-static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
-{
- struct snd_msndmidi *mpu = rmidi->private_data;
- kfree(mpu);
-}
-
-int snd_msndmidi_new(struct snd_card *card, int device)
-{
- struct snd_msnd *chip = card->private_data;
- struct snd_msndmidi *mpu;
- struct snd_rawmidi *rmidi;
- int err;
-
- err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
- if (err < 0)
- return err;
- mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
- if (mpu == NULL) {
- snd_device_free(card, rmidi);
- return -ENOMEM;
- }
- mpu->dev = chip;
- chip->msndmidi_mpu = mpu;
- rmidi->private_data = mpu;
- rmidi->private_free = snd_msndmidi_free;
- spin_lock_init(&mpu->input_lock);
- strcpy(rmidi->name, "MSND MIDI");
- snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
- &snd_msndmidi_input);
- rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
- return 0;
-}
diff --git a/sound/isa/msnd/msnd_pinnacle.c b/sound/isa/msnd/msnd_pinnacle.c
index 635403301a15..8caf431677e5 100644
--- a/sound/isa/msnd/msnd_pinnacle.c
+++ b/sound/isa/msnd/msnd_pinnacle.c
@@ -142,11 +142,6 @@ static void snd_msnd_eval_dsp_msg(struct snd_msnd *chip, u16 wMessage)
}
break;

- case HIMT_MIDI_IN_UCHAR:
- if (chip->msndmidi_mpu)
- snd_msndmidi_input_read(chip->msndmidi_mpu);
- break;
-
default:
dev_dbg(chip->card->dev, LOGNAME ": HIMT message %d 0x%02x\n",
HIBYTE(wMessage), HIBYTE(wMessage));
--
2.49.0