path: root/sound/core/info.c

/*
 *  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