1 files changed, 423 insertions, 0 deletions
diff --git a/sound/core/sound.c b/sound/core/sound.c
new file mode 100644
index 000000000..b30f027eb
--- /dev/null
+++ b/sound/core/sound.c
@@ -0,0 +1,423 @@
+/*
+ *  Advanced Linux Sound Architecture
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ *
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/minors.h>
+#include <sound/info.h>
+#include <sound/control.h>
+#include <sound/initval.h>
+#include <linux/kmod.h>
+#include <linux/mutex.h>
+
+static int major = CONFIG_SND_MAJOR;
+int snd_major;
+EXPORT_SYMBOL(snd_major);
+
+static int cards_limit = 1;
+
+MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
+MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
+MODULE_LICENSE("GPL");
+module_param(major, int, 0444);
+MODULE_PARM_DESC(major, "Major # for sound driver.");
+module_param(cards_limit, int, 0444);
+MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
+MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
+
+/* this one holds the actual max. card number currently available.
+ * as default, it's identical with cards_limit option.  when more
+ * modules are loaded manually, this limit number increases, too.
+ */
+int snd_ecards_limit;
+EXPORT_SYMBOL(snd_ecards_limit);
+
+static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
+static DEFINE_MUTEX(sound_mutex);
+
+#ifdef CONFIG_MODULES
+
+/**
+ * snd_request_card - try to load the card module
+ * @card: the card number
+ *
+ * Tries to load the module "snd-card-X" for the given card number
+ * via request_module.  Returns immediately if already loaded.
+ */
+void snd_request_card(int card)
+{
+	if (snd_card_locked(card))
+		return;
+	if (card < 0 || card >= cards_limit)
+		return;
+	request_module("snd-card-%i", card);
+}
+EXPORT_SYMBOL(snd_request_card);
+
+static void snd_request_other(int minor)
+{
+	char *str;
+
+	switch (minor) {
+	case SNDRV_MINOR_SEQUENCER:	str = "snd-seq";	break;
+	case SNDRV_MINOR_TIMER:		str = "snd-timer";	break;
+	default:			return;
+	}
+	request_module(str);
+}
+
+#endif	/* modular kernel */
+
+/**
+ * snd_lookup_minor_data - get user data of a registered device
+ * @minor: the minor number
+ * @type: device type (SNDRV_DEVICE_TYPE_XXX)
+ *
+ * Checks that a minor device with the specified type is registered, and returns
+ * its user data pointer.
+ *
+ * This function increments the reference counter of the card instance
+ * if an associated instance with the given minor number and type is found.
+ * The caller must call snd_card_unref() appropriately later.
+ *
+ * Return: The user data pointer if the specified device is found. %NULL
+ * otherwise.
+ */
+void *snd_lookup_minor_data(unsigned int minor, int type)
+{
+	struct snd_minor *mreg;
+	void *private_data;
+
+	if (minor >= ARRAY_SIZE(snd_minors))
+		return NULL;
+	mutex_lock(&sound_mutex);
+	mreg = snd_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_mutex);
+	return private_data;
+}
+EXPORT_SYMBOL(snd_lookup_minor_data);
+
+#ifdef CONFIG_MODULES
+static struct snd_minor *autoload_device(unsigned int minor)
+{
+	int dev;
+	mutex_unlock(&sound_mutex); /* release lock temporarily */
+	dev = SNDRV_MINOR_DEVICE(minor);
+	if (dev == SNDRV_MINOR_CONTROL) {
+		/* /dev/aloadC? */
+		int card = SNDRV_MINOR_CARD(minor);
+		if (snd_cards[card] == NULL)
+			snd_request_card(card);
+	} else if (dev == SNDRV_MINOR_GLOBAL) {
+		/* /dev/aloadSEQ */
+		snd_request_other(minor);
+	}
+	mutex_lock(&sound_mutex); /* reacuire lock */
+	return snd_minors[minor];
+}
+#else /* !CONFIG_MODULES */
+#define autoload_device(minor)	NULL
+#endif /* CONFIG_MODULES */
+
+static int snd_open(struct inode *inode, struct file *file)
+{
+	unsigned int minor = iminor(inode);
+	struct snd_minor *mptr = NULL;
+	const struct file_operations *new_fops;
+	int err = 0;
+
+	if (minor >= ARRAY_SIZE(snd_minors))
+		return -ENODEV;
+	mutex_lock(&sound_mutex);
+	mptr = snd_minors[minor];
+	if (mptr == NULL) {
+		mptr = autoload_device(minor);
+		if (!mptr) {
+			mutex_unlock(&sound_mutex);
+			return -ENODEV;
+		}
+	}
+	new_fops = fops_get(mptr->f_ops);
+	mutex_unlock(&sound_mutex);
+	if (!new_fops)
+		return -ENODEV;
+	replace_fops(file, new_fops);
+
+	if (file->f_op->open)
+		err = file->f_op->open(inode, file);
+	return err;
+}
+
+static const struct file_operations snd_fops =
+{
+	.owner =	THIS_MODULE,
+	.open =		snd_open,
+	.llseek =	noop_llseek,
+};
+
+#ifdef CONFIG_SND_DYNAMIC_MINORS
+static int snd_find_free_minor(int type, struct snd_card *card, int dev)
+{
+	int minor;
+
+	/* static minors for module auto loading */
+	if (type == SNDRV_DEVICE_TYPE_SEQUENCER)
+		return SNDRV_MINOR_SEQUENCER;
+	if (type == SNDRV_DEVICE_TYPE_TIMER)
+		return SNDRV_MINOR_TIMER;
+
+	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
+		/* skip static minors still used for module auto loading */
+		if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL)
+			continue;
+		if (minor == SNDRV_MINOR_SEQUENCER ||
+		    minor == SNDRV_MINOR_TIMER)
+			continue;
+		if (!snd_minors[minor])
+			return minor;
+	}
+	return -EBUSY;
+}
+#else
+static int snd_find_free_minor(int type, struct snd_card *card, int dev)
+{
+	int minor;
+
+	switch (type) {
+	case SNDRV_DEVICE_TYPE_SEQUENCER:
+	case SNDRV_DEVICE_TYPE_TIMER:
+		minor = type;
+		break;
+	case SNDRV_DEVICE_TYPE_CONTROL:
+		if (snd_BUG_ON(!card))
+			return -EINVAL;
+		minor = SNDRV_MINOR(card->number, type);
+		break;
+	case SNDRV_DEVICE_TYPE_HWDEP:
+	case SNDRV_DEVICE_TYPE_RAWMIDI:
+	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
+	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
+	case SNDRV_DEVICE_TYPE_COMPRESS:
+		if (snd_BUG_ON(!card))
+			return -EINVAL;
+		minor = SNDRV_MINOR(card->number, type + dev);
+		break;
+	default:
+		return -EINVAL;
+	}
+	if (snd_BUG_ON(minor < 0 || minor >= SNDRV_OS_MINORS))
+		return -EINVAL;
+	if (snd_minors[minor])
+		return -EBUSY;
+	return minor;
+}
+#endif
+
+/**
+ * snd_register_device - Register the ALSA device file for the card
+ * @type: the device type, SNDRV_DEVICE_TYPE_XXX
+ * @card: the card instance
+ * @dev: the device index
+ * @f_ops: the file operations
+ * @private_data: user pointer for f_ops->open()
+ * @device: the device to register
+ *
+ * Registers an ALSA device file for the given card.
+ * The operators have to be set in reg parameter.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
+ */
+int snd_register_device(int type, struct snd_card *card, int dev,
+			const struct file_operations *f_ops,
+			void *private_data, struct device *device)
+{
+	int minor;
+	int err = 0;
+	struct snd_minor *preg;
+
+	if (snd_BUG_ON(!device))
+		return -EINVAL;
+
+	preg = kmalloc(sizeof *preg, 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_mutex);
+	minor = snd_find_free_minor(type, card, dev);
+	if (minor < 0) {
+		err = minor;
+		goto error;
+	}
+
+	preg->dev = device;
+	device->devt = MKDEV(major, minor);
+	err = device_add(device);
+	if (err < 0)
+		goto error;
+
+	snd_minors[minor] = preg;
+ error:
+	mutex_unlock(&sound_mutex);
+	if (err < 0)
+		kfree(preg);
+	return err;
+}
+EXPORT_SYMBOL(snd_register_device);
+
+/**
+ * snd_unregister_device - unregister the device on the given card
+ * @dev: the device instance
+ *
+ * Unregisters the device file already registered via
+ * snd_register_device().
+ *
+ * Return: Zero if successful, or a negative error code on failure.
+ */
+int snd_unregister_device(struct device *dev)
+{
+	int minor;
+	struct snd_minor *preg;
+
+	mutex_lock(&sound_mutex);
+	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
+		preg = snd_minors[minor];
+		if (preg && preg->dev == dev) {
+			snd_minors[minor] = NULL;
+			device_del(dev);
+			kfree(preg);
+			break;
+		}
+	}
+	mutex_unlock(&sound_mutex);
+	if (minor >= ARRAY_SIZE(snd_minors))
+		return -ENOENT;
+	return 0;
+}
+EXPORT_SYMBOL(snd_unregister_device);
+
+#ifdef CONFIG_SND_PROC_FS
+/*
+ *  INFO PART
+ */
+static const char *snd_device_type_name(int type)
+{
+	switch (type) {
+	case SNDRV_DEVICE_TYPE_CONTROL:
+		return "control";
+	case SNDRV_DEVICE_TYPE_HWDEP:
+		return "hardware dependent";
+	case SNDRV_DEVICE_TYPE_RAWMIDI:
+		return "raw midi";
+	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
+		return "digital audio playback";
+	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
+		return "digital audio capture";
+	case SNDRV_DEVICE_TYPE_SEQUENCER:
+		return "sequencer";
+	case SNDRV_DEVICE_TYPE_TIMER:
+		return "timer";
+	default:
+		return "?";
+	}
+}
+
+static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
+{
+	int minor;
+	struct snd_minor *mptr;
+
+	mutex_lock(&sound_mutex);
+	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
+		if (!(mptr = snd_minors[minor]))
+			continue;
+		if (mptr->card >= 0) {
+			if (mptr->device >= 0)
+				snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
+					    minor, mptr->card, mptr->device,
+					    snd_device_type_name(mptr->type));
+			else
+				snd_iprintf(buffer, "%3i: [%2i]   : %s\n",
+					    minor, mptr->card,
+					    snd_device_type_name(mptr->type));
+		} else
+			snd_iprintf(buffer, "%3i:        : %s\n", minor,
+				    snd_device_type_name(mptr->type));
+	}
+	mutex_unlock(&sound_mutex);
+}
+
+int __init snd_minor_info_init(void)
+{
+	struct snd_info_entry *entry;
+
+	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
+	if (!entry)
+		return -ENOMEM;
+	entry->c.text.read = snd_minor_info_read;
+	return snd_info_register(entry); /* freed in error path */
+}
+#endif /* CONFIG_SND_PROC_FS */
+
+/*
+ *  INIT PART
+ */
+
+static int __init alsa_sound_init(void)
+{
+	snd_major = major;
+	snd_ecards_limit = cards_limit;
+	if (register_chrdev(major, "alsa", &snd_fops)) {
+		pr_err("ALSA core: unable to register native major device number %d\n", major);
+		return -EIO;
+	}
+	if (snd_info_init() < 0) {
+		unregister_chrdev(major, "alsa");
+		return -ENOMEM;
+	}
+#ifndef MODULE
+	pr_info("Advanced Linux Sound Architecture Driver Initialized.\n");
+#endif
+	return 0;
+}
+
+static void __exit alsa_sound_exit(void)
+{
+	snd_info_done();
+	unregister_chrdev(major, "alsa");
+}
+
+subsys_initcall(alsa_sound_init);
+module_exit(alsa_sound_exit);