1 files changed, 240 insertions, 0 deletions
diff --git a/sound/core/device.c b/sound/core/device.c
new file mode 100644
index 00000000000..18c71f913d2
--- /dev/null
+++ b/sound/core/device.c
@@ -0,0 +1,240 @@
+/*
+ *  Device management routines
+ *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/errno.h>
+#include <sound/core.h>
+
+/**
+ * snd_device_new - create an ALSA device component
+ * @card: the card instance
+ * @type: the device type, SNDRV_DEV_TYPE_XXX
+ * @device_data: the data pointer of this device
+ * @ops: the operator table
+ *
+ * Creates a new device component for the given data pointer.
+ * The device will be assigned to the card and managed together
+ * by the card.
+ *
+ * The data pointer plays a role as the identifier, too, so the
+ * pointer address must be unique and unchanged.
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_device_new(snd_card_t *card, snd_device_type_t type,
+		   void *device_data, snd_device_ops_t *ops)
+{
+	snd_device_t *dev;
+
+	snd_assert(card != NULL && device_data != NULL && ops != NULL, return -ENXIO);
+	dev = kcalloc(1, sizeof(*dev), GFP_KERNEL);
+	if (dev == NULL)
+		return -ENOMEM;
+	dev->card = card;
+	dev->type = type;
+	dev->state = SNDRV_DEV_BUILD;
+	dev->device_data = device_data;
+	dev->ops = ops;
+	list_add(&dev->list, &card->devices);	/* add to the head of list */
+	return 0;
+}
+
+/**
+ * snd_device_free - release the device from the card
+ * @card: the card instance
+ * @device_data: the data pointer to release
+ *
+ * Removes the device from the list on the card and invokes the
+ * callback, dev_unregister or dev_free, corresponding to the state.
+ * Then release the device.
+ *
+ * Returns zero if successful, or a negative error code on failure or if the
+ * device not found.
+ */
+int snd_device_free(snd_card_t *card, void *device_data)
+{
+	struct list_head *list;
+	snd_device_t *dev;
+	
+	snd_assert(card != NULL, return -ENXIO);
+	snd_assert(device_data != NULL, return -ENXIO);
+	list_for_each(list, &card->devices) {
+		dev = snd_device(list);
+		if (dev->device_data != device_data)
+			continue;
+		/* unlink */
+		list_del(&dev->list);
+		if ((dev->state == SNDRV_DEV_REGISTERED || dev->state == SNDRV_DEV_DISCONNECTED) &&
+		    dev->ops->dev_unregister) {
+			if (dev->ops->dev_unregister(dev))
+				snd_printk(KERN_ERR "device unregister failure\n");
+		} else {
+			if (dev->ops->dev_free) {
+				if (dev->ops->dev_free(dev))
+					snd_printk(KERN_ERR "device free failure\n");
+			}
+		}
+		kfree(dev);
+		return 0;
+	}
+	snd_printd("device free %p (from %p), not found\n", device_data, __builtin_return_address(0));
+	return -ENXIO;
+}
+
+/**
+ * snd_device_free - disconnect the device
+ * @card: the card instance
+ * @device_data: the data pointer to disconnect
+ *
+ * Turns the device into the disconnection state, invoking
+ * dev_disconnect callback, if the device was already registered.
+ *
+ * Usually called from snd_card_disconnect().
+ *
+ * Returns zero if successful, or a negative error code on failure or if the
+ * device not found.
+ */
+int snd_device_disconnect(snd_card_t *card, void *device_data)
+{
+	struct list_head *list;
+	snd_device_t *dev;
+	
+	snd_assert(card != NULL, return -ENXIO);
+	snd_assert(device_data != NULL, return -ENXIO);
+	list_for_each(list, &card->devices) {
+		dev = snd_device(list);
+		if (dev->device_data != device_data)
+			continue;
+		if (dev->state == SNDRV_DEV_REGISTERED && dev->ops->dev_disconnect) {
+			if (dev->ops->dev_disconnect(dev))
+				snd_printk(KERN_ERR "device disconnect failure\n");
+			dev->state = SNDRV_DEV_DISCONNECTED;
+		}
+		return 0;
+	}
+	snd_printd("device disconnect %p (from %p), not found\n", device_data, __builtin_return_address(0));
+	return -ENXIO;
+}
+
+/**
+ * snd_device_register - register the device
+ * @card: the card instance
+ * @device_data: the data pointer to register
+ *
+ * Registers the device which was already created via
+ * snd_device_new().  Usually this is called from snd_card_register(),
+ * but it can be called later if any new devices are created after
+ * invocation of snd_card_register().
+ *
+ * Returns zero if successful, or a negative error code on failure or if the
+ * device not found.
+ */
+int snd_device_register(snd_card_t *card, void *device_data)
+{
+	struct list_head *list;
+	snd_device_t *dev;
+	int err;
+	
+	snd_assert(card != NULL && device_data != NULL, return -ENXIO);
+	list_for_each(list, &card->devices) {
+		dev = snd_device(list);
+		if (dev->device_data != device_data)
+			continue;
+		if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
+			if ((err = dev->ops->dev_register(dev)) < 0)
+				return err;
+			dev->state = SNDRV_DEV_REGISTERED;
+			return 0;
+		}
+		return -EBUSY;
+	}
+	snd_BUG();
+	return -ENXIO;
+}
+
+/*
+ * register all the devices on the card.
+ * called from init.c
+ */
+int snd_device_register_all(snd_card_t *card)
+{
+	struct list_head *list;
+	snd_device_t *dev;
+	int err;
+	
+	snd_assert(card != NULL, return -ENXIO);
+	list_for_each(list, &card->devices) {
+		dev = snd_device(list);
+		if (dev->state == SNDRV_DEV_BUILD && dev->ops->dev_register) {
+			if ((err = dev->ops->dev_register(dev)) < 0)
+				return err;
+			dev->state = SNDRV_DEV_REGISTERED;
+		}
+	}
+	return 0;
+}
+
+/*
+ * disconnect all the devices on the card.
+ * called from init.c
+ */
+int snd_device_disconnect_all(snd_card_t *card)
+{
+	snd_device_t *dev;
+	struct list_head *list;
+	int err = 0;
+
+	snd_assert(card != NULL, return -ENXIO);
+	list_for_each(list, &card->devices) {
+		dev = snd_device(list);
+		if (snd_device_disconnect(card, dev->device_data) < 0)
+			err = -ENXIO;
+	}
+	return err;
+}
+
+/*
+ * release all the devices on the card.
+ * called from init.c
+ */
+int snd_device_free_all(snd_card_t *card, snd_device_cmd_t cmd)
+{
+	snd_device_t *dev;
+	struct list_head *list;
+	int err;
+	unsigned int range_low, range_high;
+
+	snd_assert(card != NULL, return -ENXIO);
+	range_low = cmd * SNDRV_DEV_TYPE_RANGE_SIZE;
+	range_high = range_low + SNDRV_DEV_TYPE_RANGE_SIZE - 1;
+      __again:
+	list_for_each(list, &card->devices) {
+		dev = snd_device(list);		
+		if (dev->type >= range_low && dev->type <= range_high) {
+			if ((err = snd_device_free(card, dev->device_data)) < 0)
+				return err;
+			goto __again;
+		}
+	}
+	return 0;
+}