Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 250 insertions, 0 deletions

diff --git a/sound/core/sound_oss.c b/sound/core/sound_oss.c
new file mode 100644
index 000000000..2751bf2ff
--- /dev/null
+++ b/sound/core/sound_oss.c
@@ -0,0 +1,250 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Advanced Linux Sound Architecture
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ */
+
+#include <linux/init.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/minors.h>
+#include <sound/info.h>
+#include <linux/sound.h>
+#include <linux/mutex.h>
+
+#define SNDRV_OSS_MINORS 256
+
+static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
+static DEFINE_MUTEX(sound_oss_mutex);
+
+/* NOTE: This function increments the refcount of the associated card like
+ * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
+ */
+void *snd_lookup_oss_minor_data(unsigned int minor, int type)
+{
+	struct snd_minor *mreg;
+	void *private_data;
+
+	if (minor >= ARRAY_SIZE(snd_oss_minors))
+		return NULL;
+	mutex_lock(&sound_oss_mutex);
+	mreg = snd_oss_minors[minor];
+	if (mreg && mreg->type == type) {
+		private_data = mreg->private_data;
+		if (private_data && mreg->card_ptr)
+			get_device(&mreg->card_ptr->card_dev);
+	} else
+		private_data = NULL;
+	mutex_unlock(&sound_oss_mutex);
+	return private_data;
+}
+EXPORT_SYMBOL(snd_lookup_oss_minor_data);
+
+static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
+{
+	int minor;
+
+	switch (type) {
+	case SNDRV_OSS_DEVICE_TYPE_MIXER:
+		if (snd_BUG_ON(!card || dev < 0 || dev > 1))
+			return -EINVAL;
+		minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
+		break;
+	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
+		minor = SNDRV_MINOR_OSS_SEQUENCER;
+		break;
+	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
+		minor = SNDRV_MINOR_OSS_MUSIC;
+		break;
+	case SNDRV_OSS_DEVICE_TYPE_PCM:
+		if (snd_BUG_ON(!card || dev < 0 || dev > 1))
+			return -EINVAL;
+		minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
+		break;
+	case SNDRV_OSS_DEVICE_TYPE_MIDI:
+		if (snd_BUG_ON(!card || dev < 0 || dev > 1))
+			return -EINVAL;
+		minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
+		break;
+	case SNDRV_OSS_DEVICE_TYPE_DMFM:
+		minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
+		break;
+	case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
+		minor = SNDRV_MINOR_OSS_SNDSTAT;
+		break;
+	default:
+		return -EINVAL;
+	}
+	if (minor < 0 || minor >= SNDRV_OSS_MINORS)
+		return -EINVAL;
+	return minor;
+}
+
+int snd_register_oss_device(int type, struct snd_card *card, int dev,
+			    const struct file_operations *f_ops, void *private_data)
+{
+	int minor = snd_oss_kernel_minor(type, card, dev);
+	int minor_unit;
+	struct snd_minor *preg;
+	int cidx = SNDRV_MINOR_OSS_CARD(minor);
+	int track2 = -1;
+	int register1 = -1, register2 = -1;
+	struct device *carddev = snd_card_get_device_link(card);
+
+	if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
+		return 0; /* ignore silently */
+	if (minor < 0)
+		return minor;
+	preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
+	if (preg == NULL)
+		return -ENOMEM;
+	preg->type = type;
+	preg->card = card ? card->number : -1;
+	preg->device = dev;
+	preg->f_ops = f_ops;
+	preg->private_data = private_data;
+	preg->card_ptr = card;
+	mutex_lock(&sound_oss_mutex);
+	snd_oss_minors[minor] = preg;
+	minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
+	switch (minor_unit) {
+	case SNDRV_MINOR_OSS_PCM:
+		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
+		break;
+	case SNDRV_MINOR_OSS_MIDI:
+		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
+		break;
+	case SNDRV_MINOR_OSS_MIDI1:
+		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
+		break;
+	}
+	register1 = register_sound_special_device(f_ops, minor, carddev);
+	if (register1 != minor)
+		goto __end;
+	if (track2 >= 0) {
+		register2 = register_sound_special_device(f_ops, track2,
+							  carddev);
+		if (register2 != track2)
+			goto __end;
+		snd_oss_minors[track2] = preg;
+	}
+	mutex_unlock(&sound_oss_mutex);
+	return 0;
+
+      __end:
+      	if (register2 >= 0)
+      		unregister_sound_special(register2);
+      	if (register1 >= 0)
+      		unregister_sound_special(register1);
+	snd_oss_minors[minor] = NULL;
+	mutex_unlock(&sound_oss_mutex);
+	kfree(preg);
+      	return -EBUSY;
+}
+EXPORT_SYMBOL(snd_register_oss_device);
+
+int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
+{
+	int minor = snd_oss_kernel_minor(type, card, dev);
+	int cidx = SNDRV_MINOR_OSS_CARD(minor);
+	int track2 = -1;
+	struct snd_minor *mptr;
+
+	if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
+		return 0;
+	if (minor < 0)
+		return minor;
+	mutex_lock(&sound_oss_mutex);
+	mptr = snd_oss_minors[minor];
+	if (mptr == NULL) {
+		mutex_unlock(&sound_oss_mutex);
+		return -ENOENT;
+	}
+	switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
+	case SNDRV_MINOR_OSS_PCM:
+		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
+		break;
+	case SNDRV_MINOR_OSS_MIDI:
+		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
+		break;
+	case SNDRV_MINOR_OSS_MIDI1:
+		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
+		break;
+	}
+	if (track2 >= 0)
+		snd_oss_minors[track2] = NULL;
+	snd_oss_minors[minor] = NULL;
+	mutex_unlock(&sound_oss_mutex);
+
+	/* call unregister_sound_special() outside sound_oss_mutex;
+	 * otherwise may deadlock, as it can trigger the release of a card
+	 */
+	unregister_sound_special(minor);
+	if (track2 >= 0)
+		unregister_sound_special(track2);
+
+	kfree(mptr);
+	return 0;
+}
+EXPORT_SYMBOL(snd_unregister_oss_device);
+
+/*
+ *  INFO PART
+ */
+
+#ifdef CONFIG_SND_PROC_FS
+static const char *snd_oss_device_type_name(int type)
+{
+	switch (type) {
+	case SNDRV_OSS_DEVICE_TYPE_MIXER:
+		return "mixer";
+	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
+	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
+		return "sequencer";
+	case SNDRV_OSS_DEVICE_TYPE_PCM:
+		return "digital audio";
+	case SNDRV_OSS_DEVICE_TYPE_MIDI:
+		return "raw midi";
+	case SNDRV_OSS_DEVICE_TYPE_DMFM:
+		return "hardware dependent";
+	default:
+		return "?";
+	}
+}
+
+static void snd_minor_info_oss_read(struct snd_info_entry *entry,
+				    struct snd_info_buffer *buffer)
+{
+	int minor;
+	struct snd_minor *mptr;
+
+	mutex_lock(&sound_oss_mutex);
+	for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
+		mptr = snd_oss_minors[minor];
+		if (!mptr)
+			continue;
+		if (mptr->card >= 0)
+			snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
+				    mptr->card, mptr->device,
+				    snd_oss_device_type_name(mptr->type));
+		else
+			snd_iprintf(buffer, "%3i:       : %s\n", minor,
+				    snd_oss_device_type_name(mptr->type));
+	}
+	mutex_unlock(&sound_oss_mutex);
+}
+
+
+int __init snd_minor_info_oss_init(void)
+{
+	struct snd_info_entry *entry;
+
+	entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
+	if (!entry)
+		return -ENOMEM;
+	entry->c.text.read = snd_minor_info_oss_read;
+	return snd_info_register(entry); /* freed in error path */
+}
+#endif /* CONFIG_SND_PROC_FS */