C++ snd_info_free_entry函数代码示例

static int snd_compress_proc_init(struct snd_compr *compr)
{
	struct snd_info_entry *entry;
	char name[16];

	sprintf(name, "compr%i", compr->device);
	entry = snd_info_create_card_entry(compr->card, name,
					   compr->card->proc_root);
	if (!entry)
		return -ENOMEM;
	entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
	if (snd_info_register(entry) < 0) {
		snd_info_free_entry(entry);
		return -ENOMEM;
	}
	compr->proc_root = entry;

	entry = snd_info_create_card_entry(compr->card, "info",
					   compr->proc_root);
	if (entry) {
		snd_info_set_text_ops(entry, compr,
				      snd_compress_proc_info_read);
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			entry = NULL;
		}
	}
	compr->proc_info_entry = entry;

	return 0;
}

static void snd_compress_proc_done(struct snd_compr *compr)
{
	snd_info_free_entry(compr->proc_info_entry);
	compr->proc_info_entry = NULL;
	snd_info_free_entry(compr->proc_root);
	compr->proc_root = NULL;
}

static inline void preallocate_info_init(struct snd_pcm_substream *substream)
{
	struct snd_info_entry *entry;

	if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", substream->proc_root)) != NULL) {
		entry->c.text.read = snd_pcm_lib_preallocate_proc_read;
		entry->c.text.write = snd_pcm_lib_preallocate_proc_write;
		entry->mode |= 0200;
		entry->private_data = substream;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			entry = NULL;
		}
	}
	substream->proc_prealloc_entry = entry;
	if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max", substream->proc_root)) != NULL) {
		entry->c.text.read = snd_pcm_lib_preallocate_max_proc_read;
		entry->private_data = substream;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			entry = NULL;
		}
	}
	substream->proc_prealloc_max_entry = entry;
}

int __exit snd_seq_info_done(void)
{
	snd_info_free_entry(queues_entry);
	snd_info_free_entry(clients_entry);
	snd_info_free_entry(timer_entry);
	return 0;
}

void snd_dg00x_proc_init(struct snd_dg00x *dg00x)
{
	struct snd_info_entry *root, *entry;

	/*
	 * All nodes are automatically removed at snd_card_disconnect(),
	 * by following to link list.
	 */
	root = snd_info_create_card_entry(dg00x->card, "firewire",
					  dg00x->card->proc_root);
	if (root == NULL)
		return;

	root->mode = S_IFDIR | S_IRUGO | S_IXUGO;
	if (snd_info_register(root) < 0) {
		snd_info_free_entry(root);
		return;
	}

	entry = snd_info_create_card_entry(dg00x->card, "clock", root);
	if (entry == NULL) {
		snd_info_free_entry(root);
		return;
	}

	snd_info_set_text_ops(entry, dg00x, proc_read_clock);
	if (snd_info_register(entry) < 0) {
		snd_info_free_entry(entry);
		snd_info_free_entry(root);
	}
}

/**
 * snd_pcm_lib_preallocate_free - release the preallocated buffer of the specified substream.
 * @substream: the pcm substream instance
 *
 * Releases the pre-allocated buffer of the given substream.
 *
 * Return: Zero if successful, or a negative error code on failure.
 */
int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream)
{
	snd_pcm_lib_preallocate_dma_free(substream);
#ifdef CONFIG_SND_VERBOSE_PROCFS
	snd_info_free_entry(substream->proc_prealloc_max_entry);
	substream->proc_prealloc_max_entry = NULL;
	snd_info_free_entry(substream->proc_prealloc_entry);
	substream->proc_prealloc_entry = NULL;
#endif
	return 0;
}

void snd_bebob_proc_init(struct snd_bebob *bebob)
{
	struct snd_info_entry *root;

	/*
	 * All nodes are automatically removed at snd_card_disconnect(),
	 * by following to link list.
	 */
	root = snd_info_create_card_entry(bebob->card, "firewire",
					  bebob->card->proc_root);
	if (root == NULL)
		return;
	root->mode = S_IFDIR | S_IRUGO | S_IXUGO;
	if (snd_info_register(root) < 0) {
		snd_info_free_entry(root);
		return;
	}

	add_node(bebob, root, "clock", proc_read_clock);
	add_node(bebob, root, "firmware", proc_read_hw_info);
	add_node(bebob, root, "formation", proc_read_formation);

	if (bebob->spec->meter != NULL)
		add_node(bebob, root, "meter", proc_read_meters);
}

int snd_opl4_create_proc(struct snd_opl4 *opl4)
{
	struct snd_info_entry *entry;

	entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
	if (entry) {
		if (opl4->hardware < OPL3_HW_OPL4_ML) {
			/* OPL4 can access 4 MB external ROM/SRAM */
			entry->mode |= S_IWUSR;
			entry->size = 4 * 1024 * 1024;
		} else {
			/* OPL4-ML has 1 MB internal ROM */
			entry->size = 1 * 1024 * 1024;
		}
		entry->content = SNDRV_INFO_CONTENT_DATA;
		entry->c.ops = &snd_opl4_mem_proc_ops;
		entry->module = THIS_MODULE;
		entry->private_data = opl4;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			entry = NULL;
		}
	}
	opl4->proc_entry = entry;
	return 0;
}

/*
 * pre-allocate the buffer and create a proc file for the substream
 */
static int snd_pcm_lib_preallocate_pages1(snd_pcm_substream_t *substream,
					  size_t size, size_t max)
{
	snd_info_entry_t *entry;

	if (size > 0 && preallocate_dma && substream->number < maximum_substreams)
		preallocate_pcm_pages(substream, size);

	if (substream->dma_buffer.bytes > 0)
		substream->buffer_bytes_max = substream->dma_buffer.bytes;
	substream->dma_max = max;
	if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", substream->proc_root)) != NULL) {
		entry->c.text.read_size = 64;
		entry->c.text.read = snd_pcm_lib_preallocate_proc_read;
		entry->c.text.write_size = 64;
		entry->c.text.write = snd_pcm_lib_preallocate_proc_write;
		entry->private_data = substream;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			entry = NULL;
		}
	}
	substream->proc_prealloc_entry = entry;
	return 0;
}

int __exit snd_info_done(void)
{
	snd_card_info_done();
	snd_minor_info_oss_done();
	snd_minor_info_done();
	snd_info_version_done();
	if (snd_proc_root) {
#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
		snd_info_free_entry(snd_seq_root);
#endif
#ifdef CONFIG_SND_OSSEMUL
		snd_info_free_entry(snd_oss_root);
#endif
		snd_remove_proc_entry(&proc_root, snd_proc_root);
	}
	return 0;
}

snd_info_entry_t *snd_info_create_device(const char *name, unsigned int number, unsigned int mode)
{
#ifdef CONFIG_DEVFS_FS
	char dname[32];
#endif
	unsigned short major = number >> 16;
	unsigned short minor = (unsigned short) number;
	snd_info_entry_t *entry;
	struct proc_dir_entry *p = NULL;

	if (!major)
		major = snd_major;
	if (!mode)
		mode = S_IFCHR | S_IRUGO | S_IWUGO;
	mode &= (snd_device_mode & (S_IRUGO | S_IWUGO)) | S_IFCHR | S_IFBLK;
	entry = snd_info_create_module_entry(THIS_MODULE, name, NULL);
	if (entry == NULL)
		return NULL;
	entry->content = SNDRV_INFO_CONTENT_DEVICE;
	entry->mode = mode;
	entry->c.device.major = major;
	entry->c.device.minor = minor;
	down(&info_mutex);
	p = create_proc_entry(entry->name, entry->mode, snd_proc_dev);
	if (p) {
#ifndef TARGET_OS2
		snd_info_device_entry_prepare(p, entry);
#ifdef LINUX_2_3
		p->proc_fops = &snd_fops;
#else
		p->ops = &snd_info_device_inode_operations;
#endif
#endif
	} else {
		up(&info_mutex);
		snd_info_free_entry(entry);
		return NULL;
	}
	p->gid = snd_device_gid;
	p->uid = snd_device_uid;
	p->data = (void *) entry;
	entry->p = p;
	up(&info_mutex);
#ifdef CONFIG_DEVFS_FS
	if (strncmp(name, "controlC", 8)) {	/* created in sound.c */
		sprintf(dname, "snd/%s", name);
		devfs_register(NULL, dname, DEVFS_FL_DEFAULT,
				major, minor, mode,
				&snd_fops, NULL);
	}
#endif
	return entry;
}

int __init snd_info_init(void)
{
	struct proc_dir_entry *p;

	p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root);
	if (p == NULL)
		return -ENOMEM;
	snd_proc_root = p;
#ifdef CONFIG_SND_OSSEMUL
	{
		struct snd_info_entry *entry;
		if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
			return -ENOMEM;
		entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			return -ENOMEM;
		}
		snd_oss_root = entry;
	}
#endif
#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
	{
		struct snd_info_entry *entry;
		if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
			return -ENOMEM;
		entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			return -ENOMEM;
		}
		snd_seq_root = entry;
	}
#endif
	snd_info_version_init();
	snd_minor_info_init();
	snd_minor_info_oss_init();
	snd_card_info_init();
	return 0;
}

int snd_info_unregister(snd_info_entry_t * entry)
{
	struct proc_dir_entry *root;

	snd_assert(entry != NULL && entry->p != NULL, return -ENXIO);
	root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
	snd_assert(root, return -ENXIO);
	down(&info_mutex);
	snd_remove_proc_entry(root, entry->p);
	up(&info_mutex);
	snd_info_free_entry(entry);
	return 0;
}

static void __init snd_hwdep_proc_init(void)
{
	struct snd_info_entry *entry;

	if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
		entry->c.text.read = snd_hwdep_proc_read;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			entry = NULL;
		}
	}
	snd_hwdep_proc_entry = entry;
}

static void
add_node(struct snd_efw *efw, struct snd_info_entry *root, const char *name,
	 void (*op)(struct snd_info_entry *e, struct snd_info_buffer *b))
{
	struct snd_info_entry *entry;

	entry = snd_info_create_card_entry(efw->card, name, root);
	if (entry == NULL)
		return;

	snd_info_set_text_ops(entry, efw, op);
	if (snd_info_register(entry) < 0)
		snd_info_free_entry(entry);
}