M7350/kernel/arch/arm/mach-msm/qdsp5/audio_fm.c

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2024-09-09 08:52:07 +00:00
/* arch/arm/mach-msm/qdsp5/audio_fm.c
*
* pcm audio output device
*
* Copyright (C) 2008 Google, Inc.
* Copyright (C) 2008 HTC Corporation
* Copyright (c) 2011, The Linux Foundation. All rights reserved.
*
* 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/module.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/msm_audio.h>
#include <mach/debug_mm.h>
#include "audmgr.h"
struct audio {
struct mutex lock;
int opened;
int enabled;
int running;
struct audmgr audmgr;
uint16_t volume;
};
static struct audio fm_audio;
/* must be called with audio->lock held */
static int audio_enable(struct audio *audio)
{
struct audmgr_config cfg;
int rc = 0;
MM_DBG("\n"); /* Macro prints the file name and function */
if (audio->enabled)
return 0;
cfg.tx_rate = RPC_AUD_DEF_SAMPLE_RATE_48000;
cfg.rx_rate = RPC_AUD_DEF_SAMPLE_RATE_48000;
cfg.def_method = RPC_AUD_DEF_METHOD_HOST_PCM;
cfg.codec = RPC_AUD_DEF_CODEC_PCM;
cfg.snd_method = RPC_SND_METHOD_VOICE;
rc = audmgr_enable(&audio->audmgr, &cfg);
if (rc < 0)
return rc;
audio->enabled = 1;
return rc;
}
/* must be called with audio->lock held */
static int audio_disable(struct audio *audio)
{
MM_DBG("\n"); /* Macro prints the file name and function */
if (audio->enabled) {
audio->enabled = 0;
audmgr_disable(&audio->audmgr);
}
return 0;
}
static long audio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct audio *audio = file->private_data;
int rc = -EINVAL;
MM_DBG("cmd %d", cmd);
mutex_lock(&audio->lock);
switch (cmd) {
case AUDIO_START:
MM_DBG("AUDIO_START\n");
rc = audio_enable(audio);
break;
case AUDIO_STOP:
MM_DBG("AUDIO_STOP\n");
rc = audio_disable(audio);
audio->running = 0;
audio->enabled = 0;
break;
default:
rc = -EINVAL;
}
mutex_unlock(&audio->lock);
return rc;
}
static int audio_release(struct inode *inode, struct file *file)
{
struct audio *audio = file->private_data;
MM_DBG("audio instance 0x%08x freeing\n", (int)audio);
mutex_lock(&audio->lock);
audio_disable(audio);
audio->running = 0;
audio->enabled = 0;
audio->opened = 0;
mutex_unlock(&audio->lock);
return 0;
}
static int audio_open(struct inode *inode, struct file *file)
{
struct audio *audio = &fm_audio;
int rc = 0;
MM_DBG("\n"); /* Macro prints the file name and function */
mutex_lock(&audio->lock);
if (audio->opened) {
MM_ERR("busy\n");
rc = -EBUSY;
goto done;
}
rc = audmgr_open(&audio->audmgr);
if (rc) {
MM_ERR("%s: failed to register listnet\n", __func__);
goto done;
}
file->private_data = audio;
audio->opened = 1;
done:
mutex_unlock(&audio->lock);
return rc;
}
static const struct file_operations audio_fm_fops = {
.owner = THIS_MODULE,
.open = audio_open,
.release = audio_release,
.unlocked_ioctl = audio_ioctl,
};
struct miscdevice audio_fm_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "msm_fm",
.fops = &audio_fm_fops,
};
static int __init audio_init(void)
{
struct audio *audio = &fm_audio;
mutex_init(&audio->lock);
return misc_register(&audio_fm_misc);
}
device_initcall(audio_init);
MODULE_DESCRIPTION("MSM FM driver");
MODULE_LICENSE("GPL v2");