M7350/kernel/arch/arm/mach-msm/qdsp6/mp3.c

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2024-09-09 08:52:07 +00:00
/* arch/arm/mach-msm/qdsp6/mp3.c
*
* Copyright (C) 2009 Google, Inc.
* Copyright (C) 2009 HTC Corporation
*
* 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/slab.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/uaccess.h>
#include <linux/msm_audio.h>
#include <mach/msm_qdsp6_audio.h>
#include <mach/debug_mm.h>
#define BUFSZ (8192)
#define DMASZ (BUFSZ * 2)
struct mp3 {
struct mutex lock;
struct audio_client *ac;
uint32_t sample_rate;
uint32_t channel_count;
};
static long mp3_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct mp3 *mp3 = file->private_data;
int rc = 0;
if (cmd == AUDIO_GET_STATS) {
struct msm_audio_stats stats;
memset(&stats, 0, sizeof(stats));
if (copy_to_user((void*) arg, &stats, sizeof(stats)))
return -EFAULT;
return 0;
}
mutex_lock(&mp3->lock);
switch (cmd) {
case AUDIO_SET_VOLUME: {
int vol;
pr_debug("[%s:%s] SET_VOLUME = %d\n", __MM_FILE__,
__func__, vol);
if (copy_from_user(&vol, (void*) arg, sizeof(vol))) {
rc = -EFAULT;
break;
}
rc = q6audio_set_stream_volume(mp3->ac, vol);
break;
}
case AUDIO_START: {
uint32_t acdb_id;
pr_debug("[%s:%s] AUDIO_START\n", __MM_FILE__, __func__);
if (arg == 0) {
acdb_id = 0;
} else if (copy_from_user(&acdb_id, (void*) arg, sizeof(acdb_id))) {
pr_info("[%s:%s] copy acdb_id from user failed\n",
__MM_FILE__, __func__);
rc = -EFAULT;
break;
}
if (mp3->ac) {
pr_err("[%s:%s] active session already existing\n",
__MM_FILE__, __func__);
rc = -EBUSY;
} else {
mp3->ac = q6audio_open_mp3(BUFSZ,
mp3->sample_rate, mp3->channel_count, acdb_id);
if (!mp3->ac) {
pr_err("[%s:%s] mp3 open session failed\n",
__MM_FILE__, __func__);
rc = -ENOMEM;
}
}
break;
}
case AUDIO_STOP:
pr_debug("[%s:%s] AUDIO_STOP\n", __MM_FILE__, __func__);
break;
case AUDIO_FLUSH:
break;
case AUDIO_SET_CONFIG: {
struct msm_audio_config config;
if (mp3->ac) {
rc = -EBUSY;
pr_err("[%s:%s] active session already existing\n",
__MM_FILE__, __func__);
break;
}
if (copy_from_user(&config, (void*) arg, sizeof(config))) {
rc = -EFAULT;
break;
}
pr_debug("[%s:%s] SET_CONFIG: buffsize = %d, samplerate = %d, \
channelcount = %d\n", __MM_FILE__, __func__,
config.buffer_size, config.sample_rate,
config.channel_count);
if (config.channel_count < 1 || config.channel_count > 2) {
rc = -EINVAL;
pr_err("[%s:%s] invalid channelcount\n", __MM_FILE__,
__func__);
break;
}
mp3->sample_rate = config.sample_rate;
mp3->channel_count = config.channel_count;
break;
}
case AUDIO_GET_CONFIG: {
struct msm_audio_config config;
config.buffer_size = BUFSZ;
config.buffer_count = 2;
config.sample_rate = mp3->sample_rate;
config.channel_count = mp3->channel_count;
config.unused[0] = 0;
config.unused[1] = 0;
config.unused[2] = 0;
if (copy_to_user((void*) arg, &config, sizeof(config))) {
rc = -EFAULT;
}
pr_debug("[%s:%s] GET_CONFIG: buffsize = %d, samplerate = %d, \
channelcount = %d\n", __MM_FILE__, __func__,
config.buffer_size, config.sample_rate,
config.channel_count);
break;
}
default:
rc = -EINVAL;
}
mutex_unlock(&mp3->lock);
pr_debug("[%s:%s] rc = %d\n", __MM_FILE__, __func__, rc);
return rc;
}
static int mp3_open(struct inode *inode, struct file *file)
{
int rc = 0;
struct mp3 *mp3;
pr_info("[%s:%s] open\n", __MM_FILE__, __func__);
mp3 = kzalloc(sizeof(struct mp3), GFP_KERNEL);
if (!mp3)
return -ENOMEM;
mutex_init(&mp3->lock);
mp3->channel_count = 2;
mp3->sample_rate = 44100;
file->private_data = mp3;
return rc;
}
static ssize_t mp3_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
struct mp3 *mp3 = file->private_data;
struct audio_client *ac;
struct audio_buffer *ab;
const char __user *start = buf;
int xfer;
pr_debug("[%s:%s] count = %d\n", __MM_FILE__, __func__, count);
if (!mp3->ac)
mp3_ioctl(file, AUDIO_START, 0);
ac = mp3->ac;
if (!ac)
return -ENODEV;
while (count > 0) {
ab = ac->buf + ac->cpu_buf;
if (ab->used)
wait_event(ac->wait, (ab->used == 0));
pr_debug("[%s:%s] ab->data = %p, ac->cpu_buf = %d\n",
__MM_FILE__, __func__, ab->data, ac->cpu_buf);
xfer = count;
if (xfer > ab->size)
xfer = ab->size;
if (copy_from_user(ab->data, buf, xfer))
return -EFAULT;
buf += xfer;
count -= xfer;
ab->used = xfer;
q6audio_write(ac, ab);
ac->cpu_buf ^= 1;
}
return buf - start;
}
static int mp3_fsync(struct file *f, int datasync)
{
struct mp3 *mp3 = f->private_data;
if (mp3->ac)
return q6audio_async(mp3->ac);
return -ENODEV;
}
static int mp3_release(struct inode *inode, struct file *file)
{
struct mp3 *mp3 = file->private_data;
if (mp3->ac)
q6audio_mp3_close(mp3->ac);
kfree(mp3);
pr_info("[%s:%s] release\n", __MM_FILE__, __func__);
return 0;
}
static struct file_operations mp3_fops = {
.owner = THIS_MODULE,
.open = mp3_open,
.write = mp3_write,
.fsync = mp3_fsync,
.release = mp3_release,
.unlocked_ioctl = mp3_ioctl,
};
struct miscdevice mp3_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "msm_mp3",
.fops = &mp3_fops,
};
static int __init mp3_init(void) {
return misc_register(&mp3_misc);
}
device_initcall(mp3_init);