Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 989 insertions, 0 deletions

diff --git a/sound/core/info.c b/sound/core/info.c
new file mode 100644
index 000000000000..31faffe01cb0
--- /dev/null
+++ b/sound/core/info.c
@@ -0,0 +1,989 @@
+/*
+ *  Information interface for ALSA driver
+ *  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/init.h>
+#include <linux/vmalloc.h>
+#include <linux/time.h>
+#include <linux/smp_lock.h>
+#include <sound/core.h>
+#include <sound/minors.h>
+#include <sound/info.h>
+#include <sound/version.h>
+#include <linux/proc_fs.h>
+#include <linux/devfs_fs_kernel.h>
+#include <stdarg.h>
+
+/*
+ *
+ */
+
+int snd_info_check_reserved_words(const char *str)
+{
+        static char *reserved[] =
+        {
+                "version",
+                "meminfo",
+                "memdebug",
+                "detect",
+                "devices",
+                "oss",
+                "cards",
+                "timers",
+                "synth",
+                "pcm",
+                "seq",
+                NULL
+        };
+        char **xstr = reserved;
+
+        while (*xstr) {
+                if (!strcmp(*xstr, str))
+                        return 0;
+                xstr++;
+        }
+        if (!strncmp(str, "card", 4))
+                return 0;
+        return 1;
+}
+
+#ifdef CONFIG_PROC_FS
+
+static DECLARE_MUTEX(info_mutex);
+
+typedef struct _snd_info_private_data {
+        snd_info_buffer_t *rbuffer;
+        snd_info_buffer_t *wbuffer;
+        snd_info_entry_t *entry;
+        void *file_private_data;
+} snd_info_private_data_t;
+
+static int snd_info_version_init(void);
+static int snd_info_version_done(void);
+
+
+/**
+ * snd_iprintf - printf on the procfs buffer
+ * @buffer: the procfs buffer
+ * @fmt: the printf format
+ *
+ * Outputs the string on the procfs buffer just like printf().
+ *
+ * Returns the size of output string.
+ */
+int snd_iprintf(snd_info_buffer_t * buffer, char *fmt,...)
+{
+        va_list args;
+        int len, res;
+
+        if (buffer->stop || buffer->error)
+                return 0;
+        len = buffer->len - buffer->size;
+        va_start(args, fmt);
+        res = vsnprintf(buffer->curr, len, fmt, args);
+        va_end(args);
+        if (res >= len) {
+                buffer->stop = 1;
+                return 0;
+        }
+        buffer->curr += res;
+        buffer->size += res;
+        return res;
+}
+
+/*
+
+ */
+
+static struct proc_dir_entry *snd_proc_root = NULL;
+snd_info_entry_t *snd_seq_root = NULL;
+#ifdef CONFIG_SND_OSSEMUL
+snd_info_entry_t *snd_oss_root = NULL;
+#endif
+
+static inline void snd_info_entry_prepare(struct proc_dir_entry *de)
+{
+        de->owner = THIS_MODULE;
+}
+
+static void snd_remove_proc_entry(struct proc_dir_entry *parent,
+                                  struct proc_dir_entry *de)
+{
+        if (de)
+                remove_proc_entry(de->name, parent);
+}
+
+static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
+{
+        snd_info_private_data_t *data;
+        struct snd_info_entry *entry;
+        loff_t ret;
+
+        data = file->private_data;
+        entry = data->entry;
+        lock_kernel();
+        switch (entry->content) {
+        case SNDRV_INFO_CONTENT_TEXT:
+                switch (orig) {
+                case 0: /* SEEK_SET */
+                        file->f_pos = offset;
+                        ret = file->f_pos;
+                        goto out;
+                case 1: /* SEEK_CUR */
+                        file->f_pos += offset;
+                        ret = file->f_pos;
+                        goto out;
+                case 2: /* SEEK_END */
+                default:
+                        ret = -EINVAL;
+                        goto out;
+                }
+                break;
+        case SNDRV_INFO_CONTENT_DATA:
+                if (entry->c.ops->llseek) {
+                        ret = entry->c.ops->llseek(entry,
+                                                    data->file_private_data,
+                                                    file, offset, orig);
+                        goto out;
+                }
+                break;
+        }
+        ret = -ENXIO;
+out:
+        unlock_kernel();
+        return ret;
+}
+
+static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
+                                   size_t count, loff_t * offset)
+{
+        snd_info_private_data_t *data;
+        struct snd_info_entry *entry;
+        snd_info_buffer_t *buf;
+        size_t size = 0;
+        loff_t pos;
+
+        data = file->private_data;
+        snd_assert(data != NULL, return -ENXIO);
+        pos = *offset;
+        if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
+                return -EIO;
+        if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
+                return -EIO;
+        entry = data->entry;
+        switch (entry->content) {
+        case SNDRV_INFO_CONTENT_TEXT:
+                buf = data->rbuffer;
+                if (buf == NULL)
+                        return -EIO;
+                if (pos >= buf->size)
+                        return 0;
+                size = buf->size - pos;
+                size = min(count, size);
+                if (copy_to_user(buffer, buf->buffer + pos, size))
+                        return -EFAULT;
+                break;
+        case SNDRV_INFO_CONTENT_DATA:
+                if (entry->c.ops->read)
+                        size = entry->c.ops->read(entry,
+                                                  data->file_private_data,
+                                                  file, buffer, count, pos);
+                break;
+        }
+        if ((ssize_t) size > 0)
+                *offset = pos + size;
+        return size;
+}
+
+static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
+                                    size_t count, loff_t * offset)
+{
+        snd_info_private_data_t *data;
+        struct snd_info_entry *entry;
+        snd_info_buffer_t *buf;
+        size_t size = 0;
+        loff_t pos;
+
+        data = file->private_data;
+        snd_assert(data != NULL, return -ENXIO);
+        entry = data->entry;
+        pos = *offset;
+        if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
+                return -EIO;
+        if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
+                return -EIO;
+        switch (entry->content) {
+        case SNDRV_INFO_CONTENT_TEXT:
+                buf = data->wbuffer;
+                if (buf == NULL)
+                        return -EIO;
+                if (pos >= buf->len)
+                        return -ENOMEM;
+                size = buf->len - pos;
+                size = min(count, size);
+                if (copy_from_user(buf->buffer + pos, buffer, size))
+                        return -EFAULT;
+                if ((long)buf->size < pos + size)
+                        buf->size = pos + size;
+                break;
+        case SNDRV_INFO_CONTENT_DATA:
+                if (entry->c.ops->write)
+                        size = entry->c.ops->write(entry,
+                                                   data->file_private_data,
+                                                   file, buffer, count, pos);
+                break;
+        }
+        if ((ssize_t) size > 0)
+                *offset = pos + size;
+        return size;
+}
+
+static int snd_info_entry_open(struct inode *inode, struct file *file)
+{
+        snd_info_entry_t *entry;
+        snd_info_private_data_t *data;
+        snd_info_buffer_t *buffer;
+        struct proc_dir_entry *p;
+        int mode, err;
+
+        down(&info_mutex);
+        p = PDE(inode);
+        entry = p == NULL ? NULL : (snd_info_entry_t *)p->data;
+        if (entry == NULL || entry->disconnected) {
+                up(&info_mutex);
+                return -ENODEV;
+        }
+        if (!try_module_get(entry->module)) {
+                err = -EFAULT;
+                goto __error1;
+        }
+        mode = file->f_flags & O_ACCMODE;
+        if (mode == O_RDONLY || mode == O_RDWR) {
+                if ((entry->content == SNDRV_INFO_CONTENT_TEXT &&
+                     !entry->c.text.read_size) ||
+                    (entry->content == SNDRV_INFO_CONTENT_DATA &&
+                     entry->c.ops->read == NULL)) {
+                        err = -ENODEV;
+                        goto __error;
+                }
+        }
+        if (mode == O_WRONLY || mode == O_RDWR) {
+                if ((entry->content == SNDRV_INFO_CONTENT_TEXT &&
+                     !entry->c.text.write_size) ||
+                    (entry->content == SNDRV_INFO_CONTENT_DATA &&
+                     entry->c.ops->write == NULL)) {
+                        err = -ENODEV;
+                        goto __error;
+                }
+        }
+        data = kcalloc(1, sizeof(*data), GFP_KERNEL);
+        if (data == NULL) {
+                err = -ENOMEM;
+                goto __error;
+        }
+        data->entry = entry;
+        switch (entry->content) {
+        case SNDRV_INFO_CONTENT_TEXT:
+                if (mode == O_RDONLY || mode == O_RDWR) {
+                        buffer = kcalloc(1, sizeof(*buffer), GFP_KERNEL);
+                        if (buffer == NULL) {
+                                kfree(data);
+                                err = -ENOMEM;
+                                goto __error;
+                        }
+                        buffer->len = (entry->c.text.read_size +
+                                      (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
+                        buffer->buffer = vmalloc(buffer->len);
+                        if (buffer->buffer == NULL) {
+                                kfree(buffer);
+                                kfree(data);
+                                err = -ENOMEM;
+                                goto __error;
+                        }
+                        buffer->curr = buffer->buffer;
+                        data->rbuffer = buffer;
+                }
+                if (mode == O_WRONLY || mode == O_RDWR) {
+                        buffer = kcalloc(1, sizeof(*buffer), GFP_KERNEL);
+                        if (buffer == NULL) {
+                                if (mode == O_RDWR) {
+                                        vfree(data->rbuffer->buffer);
+                                        kfree(data->rbuffer);
+                                }
+                                kfree(data);
+                                err = -ENOMEM;
+                                goto __error;
+                        }
+                        buffer->len = (entry->c.text.write_size +
+                                      (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
+                        buffer->buffer = vmalloc(buffer->len);
+                        if (buffer->buffer == NULL) {
+                                if (mode == O_RDWR) {
+                                        vfree(data->rbuffer->buffer);
+                                        kfree(data->rbuffer);
+                                }
+                                kfree(buffer);
+                                kfree(data);
+                                err = -ENOMEM;
+                                goto __error;
+                        }
+                        buffer->curr = buffer->buffer;
+                        data->wbuffer = buffer;
+                }
+                break;
+        case SNDRV_INFO_CONTENT_DATA:   /* data */
+                if (entry->c.ops->open) {
+                        if ((err = entry->c.ops->open(entry, mode,
+                                                      &data->file_private_data)) < 0) {
+                                kfree(data);
+                                goto __error;
+                        }
+                }
+                break;
+        }
+        file->private_data = data;
+        up(&info_mutex);
+        if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
+            (mode == O_RDONLY || mode == O_RDWR)) {
+                if (entry->c.text.read) {
+                        down(&entry->access);
+                        entry->c.text.read(entry, data->rbuffer);
+                        up(&entry->access);
+                }
+        }
+        return 0;
+
+      __error:
+        module_put(entry->module);
+      __error1:
+        up(&info_mutex);
+        return err;
+}
+
+static int snd_info_entry_release(struct inode *inode, struct file *file)
+{
+        snd_info_entry_t *entry;
+        snd_info_private_data_t *data;
+        int mode;
+
+        mode = file->f_flags & O_ACCMODE;
+        data = file->private_data;
+        entry = data->entry;
+        switch (entry->content) {
+        case SNDRV_INFO_CONTENT_TEXT:
+                if (mode == O_RDONLY || mode == O_RDWR) {
+                        vfree(data->rbuffer->buffer);
+                        kfree(data->rbuffer);
+                }
+                if (mode == O_WRONLY || mode == O_RDWR) {
+                        if (entry->c.text.write) {
+                                entry->c.text.write(entry, data->wbuffer);
+                                if (data->wbuffer->error) {
+                                        snd_printk(KERN_WARNING "data write error to %s (%i)\n",
+                                                entry->name,
+                                                data->wbuffer->error);
+                                }
+                        }
+                        vfree(data->wbuffer->buffer);
+                        kfree(data->wbuffer);
+                }
+                break;
+        case SNDRV_INFO_CONTENT_DATA:
+                if (entry->c.ops->release)
+                        entry->c.ops->release(entry, mode,
+                                              data->file_private_data);
+                break;
+        }
+        module_put(entry->module);
+        kfree(data);
+        return 0;
+}
+
+static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
+{
+        snd_info_private_data_t *data;
+        struct snd_info_entry *entry;
+        unsigned int mask;
+
+        data = file->private_data;
+        if (data == NULL)
+                return 0;
+        entry = data->entry;
+        mask = 0;
+        switch (entry->content) {
+        case SNDRV_INFO_CONTENT_DATA:
+                if (entry->c.ops->poll)
+                        return entry->c.ops->poll(entry,
+                                                  data->file_private_data,
+                                                  file, wait);
+                if (entry->c.ops->read)
+                        mask |= POLLIN | POLLRDNORM;
+                if (entry->c.ops->write)
+                        mask |= POLLOUT | POLLWRNORM;
+                break;
+        }
+        return mask;
+}
+
+static inline int _snd_info_entry_ioctl(struct inode *inode, struct file *file,
+                                        unsigned int cmd, unsigned long arg)
+{
+        snd_info_private_data_t *data;
+        struct snd_info_entry *entry;
+
+        data = file->private_data;
+        if (data == NULL)
+                return 0;
+        entry = data->entry;
+        switch (entry->content) {
+        case SNDRV_INFO_CONTENT_DATA:
+                if (entry->c.ops->ioctl)
+                        return entry->c.ops->ioctl(entry,
+                                                   data->file_private_data,
+                                                   file, cmd, arg);
+                break;
+        }
+        return -ENOTTY;
+}
+
+/* FIXME: need to unlock BKL to allow preemption */
+static int snd_info_entry_ioctl(struct inode *inode, struct file *file,
+                                unsigned int cmd, unsigned long arg)
+{
+        int err;
+        unlock_kernel();
+        err = _snd_info_entry_ioctl(inode, file, cmd, arg);
+        lock_kernel();
+        return err;
+}
+
+static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
+{
+        struct inode *inode = file->f_dentry->d_inode;
+        snd_info_private_data_t *data;
+        struct snd_info_entry *entry;
+
+        data = file->private_data;
+        if (data == NULL)
+                return 0;
+        entry = data->entry;
+        switch (entry->content) {
+        case SNDRV_INFO_CONTENT_DATA:
+                if (entry->c.ops->mmap)
+                        return entry->c.ops->mmap(entry,
+                                                  data->file_private_data,
+                                                  inode, file, vma);
+                break;
+        }
+        return -ENXIO;
+}
+
+static struct file_operations snd_info_entry_operations =
+{
+        .owner =        THIS_MODULE,
+        .llseek =       snd_info_entry_llseek,
+        .read =         snd_info_entry_read,
+        .write =        snd_info_entry_write,
+        .poll =         snd_info_entry_poll,
+        .ioctl =        snd_info_entry_ioctl,
+        .mmap =         snd_info_entry_mmap,
+        .open =         snd_info_entry_open,
+        .release =      snd_info_entry_release,
+};
+
+/**
+ * snd_create_proc_entry - create a procfs entry
+ * @name: the name of the proc file
+ * @mode: the file permission bits, S_Ixxx
+ * @parent: the parent proc-directory entry
+ *
+ * Creates a new proc file entry with the given name and permission
+ * on the given directory.
+ *
+ * Returns the pointer of new instance or NULL on failure.
+ */
+static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode,
+                                                    struct proc_dir_entry *parent)
+{
+        struct proc_dir_entry *p;
+        p = create_proc_entry(name, mode, parent);
+        if (p)
+                snd_info_entry_prepare(p);
+        return p;
+}
+
+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
+        {
+                snd_info_entry_t *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)
+        {
+                snd_info_entry_t *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_memory_info_init();
+        snd_minor_info_init();
+        snd_minor_info_oss_init();
+        snd_card_info_init();
+        return 0;
+}
+
+int __exit snd_info_done(void)
+{
+        snd_card_info_done();
+        snd_minor_info_oss_done();
+        snd_minor_info_done();
+        snd_memory_info_done();
+        snd_info_version_done();
+        if (snd_proc_root) {
+#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
+                if (snd_seq_root)
+                        snd_info_unregister(snd_seq_root);
+#endif
+#ifdef CONFIG_SND_OSSEMUL
+                if (snd_oss_root)
+                        snd_info_unregister(snd_oss_root);
+#endif
+                snd_remove_proc_entry(&proc_root, snd_proc_root);
+        }
+        return 0;
+}
+
+/*
+
+ */
+
+
+/*
+ * create a card proc file
+ * called from init.c
+ */
+int snd_info_card_create(snd_card_t * card)
+{
+        char str[8];
+        snd_info_entry_t *entry;
+
+        snd_assert(card != NULL, return -ENXIO);
+
+        sprintf(str, "card%i", card->number);
+        if ((entry = snd_info_create_module_entry(card->module, str, 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;
+        }
+        card->proc_root = entry;
+        return 0;
+}
+
+/*
+ * register the card proc file
+ * called from init.c
+ */
+int snd_info_card_register(snd_card_t * card)
+{
+        struct proc_dir_entry *p;
+
+        snd_assert(card != NULL, return -ENXIO);
+
+        if (!strcmp(card->id, card->proc_root->name))
+                return 0;
+
+        p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
+        if (p == NULL)
+                return -ENOMEM;
+        card->proc_root_link = p;
+        return 0;
+}
+
+/*
+ * de-register the card proc file
+ * called from init.c
+ */
+int snd_info_card_free(snd_card_t * card)
+{
+        snd_assert(card != NULL, return -ENXIO);
+        if (card->proc_root_link) {
+                snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
+                card->proc_root_link = NULL;
+        }
+        if (card->proc_root) {
+                snd_info_unregister(card->proc_root);
+                card->proc_root = NULL;
+        }
+        return 0;
+}
+
+
+/**
+ * snd_info_get_line - read one line from the procfs buffer
+ * @buffer: the procfs buffer
+ * @line: the buffer to store
+ * @len: the max. buffer size - 1
+ *
+ * Reads one line from the buffer and stores the string.
+ *
+ * Returns zero if successful, or 1 if error or EOF.
+ */
+int snd_info_get_line(snd_info_buffer_t * buffer, char *line, int len)
+{
+        int c = -1;
+
+        if (len <= 0 || buffer->stop || buffer->error)
+                return 1;
+        while (--len > 0) {
+                c = *buffer->curr++;
+                if (c == '\n') {
+                        if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
+                                buffer->stop = 1;
+                        }
+                        break;
+                }
+                *line++ = c;
+                if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
+                        buffer->stop = 1;
+                        break;
+                }
+        }
+        while (c != '\n' && !buffer->stop) {
+                c = *buffer->curr++;
+                if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
+                        buffer->stop = 1;
+                }
+        }
+        *line = '\0';
+        return 0;
+}
+
+/**
+ * snd_info_get_line - parse a string token
+ * @dest: the buffer to store the string token
+ * @src: the original string
+ * @len: the max. length of token - 1
+ *
+ * Parses the original string and copy a token to the given
+ * string buffer.
+ *
+ * Returns the updated pointer of the original string so that
+ * it can be used for the next call.
+ */
+char *snd_info_get_str(char *dest, char *src, int len)
+{
+        int c;
+
+        while (*src == ' ' || *src == '\t')
+                src++;
+        if (*src == '"' || *src == '\'') {
+                c = *src++;
+                while (--len > 0 && *src && *src != c) {
+                        *dest++ = *src++;
+                }
+                if (*src == c)
+                        src++;
+        } else {
+                while (--len > 0 && *src && *src != ' ' && *src != '\t') {
+                        *dest++ = *src++;
+                }
+        }
+        *dest = 0;
+        while (*src == ' ' || *src == '\t')
+                src++;
+        return src;
+}
+
+/**
+ * snd_info_create_entry - create an info entry
+ * @name: the proc file name
+ *
+ * Creates an info entry with the given file name and initializes as
+ * the default state.
+ *
+ * Usually called from other functions such as
+ * snd_info_create_card_entry().
+ *
+ * Returns the pointer of the new instance, or NULL on failure.
+ */
+static snd_info_entry_t *snd_info_create_entry(const char *name)
+{
+        snd_info_entry_t *entry;
+        entry = kcalloc(1, sizeof(*entry), GFP_KERNEL);
+        if (entry == NULL)
+                return NULL;
+        entry->name = snd_kmalloc_strdup(name, GFP_KERNEL);
+        if (entry->name == NULL) {
+                kfree(entry);
+                return NULL;
+        }
+        entry->mode = S_IFREG | S_IRUGO;
+        entry->content = SNDRV_INFO_CONTENT_TEXT;
+        init_MUTEX(&entry->access);
+        return entry;
+}
+
+/**
+ * snd_info_create_module_entry - create an info entry for the given module
+ * @module: the module pointer
+ * @name: the file name
+ * @parent: the parent directory
+ *
+ * Creates a new info entry and assigns it to the given module.
+ *
+ * Returns the pointer of the new instance, or NULL on failure.
+ */
+snd_info_entry_t *snd_info_create_module_entry(struct module * module,
+                                               const char *name,
+                                               snd_info_entry_t *parent)
+{
+        snd_info_entry_t *entry = snd_info_create_entry(name);
+        if (entry) {
+                entry->module = module;
+                entry->parent = parent;
+        }
+        return entry;
+}
+
+/**
+ * snd_info_create_card_entry - create an info entry for the given card
+ * @card: the card instance
+ * @name: the file name
+ * @parent: the parent directory
+ *
+ * Creates a new info entry and assigns it to the given card.
+ *
+ * Returns the pointer of the new instance, or NULL on failure.
+ */
+snd_info_entry_t *snd_info_create_card_entry(snd_card_t * card,
+                                             const char *name,
+                                             snd_info_entry_t * parent)
+{
+        snd_info_entry_t *entry = snd_info_create_entry(name);
+        if (entry) {
+                entry->module = card->module;
+                entry->card = card;
+                entry->parent = parent;
+        }
+        return entry;
+}
+
+static int snd_info_dev_free_entry(snd_device_t *device)
+{
+        snd_info_entry_t *entry = device->device_data;
+        snd_info_free_entry(entry);
+        return 0;
+}
+
+static int snd_info_dev_register_entry(snd_device_t *device)
+{
+        snd_info_entry_t *entry = device->device_data;
+        return snd_info_register(entry);
+}
+
+static int snd_info_dev_disconnect_entry(snd_device_t *device)
+{
+        snd_info_entry_t *entry = device->device_data;
+        entry->disconnected = 1;
+        return 0;
+}
+
+static int snd_info_dev_unregister_entry(snd_device_t *device)
+{
+        snd_info_entry_t *entry = device->device_data;
+        return snd_info_unregister(entry);
+}
+
+/**
+ * snd_card_proc_new - create an info entry for the given card
+ * @card: the card instance
+ * @name: the file name
+ * @entryp: the pointer to store the new info entry
+ *
+ * Creates a new info entry and assigns it to the given card.
+ * Unlike snd_info_create_card_entry(), this function registers the
+ * info entry as an ALSA device component, so that it can be
+ * unregistered/released without explicit call.
+ * Also, you don't have to register this entry via snd_info_register(),
+ * since this will be registered by snd_card_register() automatically.
+ *
+ * The parent is assumed as card->proc_root.
+ *
+ * For releasing this entry, use snd_device_free() instead of
+ * snd_info_free_entry(). 
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_card_proc_new(snd_card_t *card, const char *name,
+                      snd_info_entry_t **entryp)
+{
+        static snd_device_ops_t ops = {
+                .dev_free = snd_info_dev_free_entry,
+                .dev_register = snd_info_dev_register_entry,
+                .dev_disconnect = snd_info_dev_disconnect_entry,
+                .dev_unregister = snd_info_dev_unregister_entry
+        };
+        snd_info_entry_t *entry;
+        int err;
+
+        entry = snd_info_create_card_entry(card, name, card->proc_root);
+        if (! entry)
+                return -ENOMEM;
+        if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
+                snd_info_free_entry(entry);
+                return err;
+        }
+        if (entryp)
+                *entryp = entry;
+        return 0;
+}
+
+/**
+ * snd_info_free_entry - release the info entry
+ * @entry: the info entry
+ *
+ * Releases the info entry.  Don't call this after registered.
+ */
+void snd_info_free_entry(snd_info_entry_t * entry)
+{
+        if (entry == NULL)
+                return;
+        kfree(entry->name);
+        if (entry->private_free)
+                entry->private_free(entry);
+        kfree(entry);
+}
+
+/**
+ * snd_info_register - register the info entry
+ * @entry: the info entry
+ *
+ * Registers the proc info entry.
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_info_register(snd_info_entry_t * entry)
+{
+        struct proc_dir_entry *root, *p = NULL;
+
+        snd_assert(entry != NULL, return -ENXIO);
+        root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
+        down(&info_mutex);
+        p = snd_create_proc_entry(entry->name, entry->mode, root);
+        if (!p) {
+                up(&info_mutex);
+                return -ENOMEM;
+        }
+        p->owner = entry->module;
+        if (!S_ISDIR(entry->mode))
+                p->proc_fops = &snd_info_entry_operations;
+        p->size = entry->size;
+        p->data = entry;
+        entry->p = p;
+        up(&info_mutex);
+        return 0;
+}
+
+/**
+ * snd_info_unregister - de-register the info entry
+ * @entry: the info entry
+ *
+ * De-registers the info entry and releases the instance.
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+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 snd_info_entry_t *snd_info_version_entry = NULL;
+
+static void snd_info_version_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
+{
+        snd_iprintf(buffer,
+                    "Advanced Linux Sound Architecture Driver Version "
+                    CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
+                   );
+}
+
+static int __init snd_info_version_init(void)
+{
+        snd_info_entry_t *entry;
+
+        entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
+        if (entry == NULL)
+                return -ENOMEM;
+        entry->c.text.read_size = 256;
+        entry->c.text.read = snd_info_version_read;
+        if (snd_info_register(entry) < 0) {
+                snd_info_free_entry(entry);
+                return -ENOMEM;
+        }
+        snd_info_version_entry = entry;
+        return 0;
+}
+
+static int __exit snd_info_version_done(void)
+{
+        if (snd_info_version_entry)
+                snd_info_unregister(snd_info_version_entry);
+        return 0;
+}
+
+#endif /* CONFIG_PROC_FS */