arch/arm/mach-msm/qdsp6/routing.c

/* arch/arm/mach-msm/qdsp6/routing.c
 *
 * Copyright (C) 2009 Google, Inc.
 * Author: Brian Swetland <swetland@google.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */

#include <linux/fs.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <mach/debug_mm.h>

extern int q6audio_set_route(const char *name);

static int q6_open(struct inode *inode, struct file *file)
{
	pr_debug("[%s:%s]\n", __MM_FILE__, __func__);
	return 0;
}

static ssize_t q6_write(struct file *file, const char __user *buf,
			size_t count, loff_t *pos)
{
	char cmd[32];

	pr_debug("[%s:%s] count = %d", __MM_FILE__, __func__, count);
	if (count >= sizeof(cmd)) {
		pr_err("[%s:%s] invalid count %d\n", __MM_FILE__,
			__func__, count);
			return -EINVAL;
	}
	if (copy_from_user(cmd, buf, count))
		return -EFAULT;
	cmd[count] = 0;

	if ((count > 1) && (cmd[count-1] == '\n'))
		cmd[count-1] = 0;

	q6audio_set_route(cmd);

	return count;
}

static int q6_release(struct inode *inode, struct file *file)
{
	pr_debug("[%s:%s]\n", __MM_FILE__, __func__);
	return 0;
}

static struct file_operations q6_fops = {
	.owner		= THIS_MODULE,
	.open		= q6_open,
	.write		= q6_write,
	.release	= q6_release,
};

static struct miscdevice q6_misc = {
	.minor	= MISC_DYNAMIC_MINOR,
	.name	= "msm_audio_route",
	.fops	= &q6_fops,
};


static int __init q6_init(void) {
	return misc_register(&q6_misc);
}

device_initcall(q6_init);