277 lines
6.6 KiB
C
277 lines
6.6 KiB
C
/* arch/arm/mach-msm/qdsp6/pcm_out.c
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*
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* Copyright (C) 2009 Google, Inc.
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* Author: Brian Swetland <swetland@google.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/miscdevice.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/uaccess.h>
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#include <linux/msm_audio.h>
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#include <mach/msm_qdsp6_audio.h>
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#include <mach/debug_mm.h>
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void audio_client_dump(struct audio_client *ac);
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#define BUFSZ (3072)
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struct pcm {
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struct mutex lock;
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struct audio_client *ac;
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uint32_t sample_rate;
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uint32_t channel_count;
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size_t buffer_size;
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};
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static long pcm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct pcm *pcm = file->private_data;
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int rc = 0;
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if (cmd == AUDIO_GET_STATS) {
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struct msm_audio_stats stats;
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memset(&stats, 0, sizeof(stats));
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if (copy_to_user((void*) arg, &stats, sizeof(stats)))
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return -EFAULT;
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return 0;
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}
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mutex_lock(&pcm->lock);
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switch (cmd) {
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case AUDIO_SET_VOLUME: {
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int vol;
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if (!pcm->ac) {
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pr_err("%s: cannot set volume before AUDIO_START!\n",
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__func__);
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rc = -EINVAL;
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break;
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}
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if (copy_from_user(&vol, (void*) arg, sizeof(vol))) {
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rc = -EFAULT;
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break;
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}
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pr_debug("[%s:%s] SET_VOLUME: vol = %d\n", __MM_FILE__,
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__func__, vol);
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rc = q6audio_set_stream_volume(pcm->ac, vol);
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break;
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}
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case AUDIO_START: {
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uint32_t acdb_id;
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pr_debug("[%s:%s] AUDIO_START\n", __MM_FILE__, __func__);
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if (arg == 0) {
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acdb_id = 0;
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} else if (copy_from_user(&acdb_id, (void*) arg, sizeof(acdb_id))) {
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pr_info("[%s:%s] copy acdb_id from user failed\n",
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__MM_FILE__, __func__);
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rc = -EFAULT;
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break;
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}
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if (pcm->ac) {
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pr_err("[%s:%s] active session already existing\n",
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__MM_FILE__, __func__);
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rc = -EBUSY;
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} else {
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pcm->ac = q6audio_open_pcm(pcm->buffer_size,
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pcm->sample_rate,
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pcm->channel_count,
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AUDIO_FLAG_WRITE, acdb_id);
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if (!pcm->ac) {
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pr_err("[%s:%s] pcm open session failed\n",
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__MM_FILE__, __func__);
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rc = -ENOMEM;
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}
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}
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break;
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}
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case AUDIO_STOP:
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pr_debug("[%s:%s] AUDIO_STOP\n", __MM_FILE__, __func__);
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break;
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case AUDIO_FLUSH:
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break;
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case AUDIO_SET_CONFIG: {
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struct msm_audio_config config;
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if (pcm->ac) {
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rc = -EBUSY;
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pr_err("[%s:%s] active session already existing\n",
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__MM_FILE__, __func__);
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break;
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}
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if (copy_from_user(&config, (void*) arg, sizeof(config))) {
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rc = -EFAULT;
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break;
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}
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pr_debug("[%s:%s] SET_CONFIG: samplerate = %d, channels = %d\n",
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__MM_FILE__, __func__, config.sample_rate,
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config.channel_count);
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if (config.channel_count < 1 || config.channel_count > 2) {
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rc = -EINVAL;
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pr_err("[%s:%s] invalid channelcount %d\n",
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__MM_FILE__, __func__, config.channel_count);
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break;
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}
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if (config.sample_rate < 8000 || config.sample_rate > 48000) {
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rc = -EINVAL;
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pr_err("[%s:%s] invalid samplerate %d\n", __MM_FILE__,
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__func__, config.sample_rate);
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break;
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}
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if (config.buffer_size < 128 || config.buffer_size > 8192) {
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rc = -EINVAL;
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pr_err("[%s:%s] invalid buffsize %d\n", __MM_FILE__,
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__func__, config.buffer_size);
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break;
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}
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pcm->sample_rate = config.sample_rate;
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pcm->channel_count = config.channel_count;
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pcm->buffer_size = config.buffer_size;
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break;
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}
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case AUDIO_GET_CONFIG: {
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struct msm_audio_config config;
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config.buffer_size = pcm->buffer_size;
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config.buffer_count = 2;
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config.sample_rate = pcm->sample_rate;
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config.channel_count = pcm->channel_count;
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config.unused[0] = 0;
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config.unused[1] = 0;
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config.unused[2] = 0;
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if (copy_to_user((void*) arg, &config, sizeof(config))) {
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rc = -EFAULT;
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}
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pr_debug("[%s:%s] GET_CONFIG: samplerate = %d, channels = %d\n",
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__MM_FILE__, __func__, config.sample_rate,
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config.channel_count);
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break;
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}
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case AUDIO_SET_EQ: {
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struct msm_audio_eq_stream_config eq_config;
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pr_debug("[%s:%s] SET_EQ\n", __MM_FILE__, __func__);
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if (copy_from_user(&eq_config, (void *) arg,
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sizeof(eq_config))) {
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rc = -EFAULT;
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break;
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}
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rc = q6audio_set_stream_eq_pcm(pcm->ac, (void *) &eq_config);
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break;
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}
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default:
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rc = -EINVAL;
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}
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mutex_unlock(&pcm->lock);
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pr_debug("[%s:%s] rc = %d\n", __MM_FILE__, __func__, rc);
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return rc;
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}
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static int pcm_open(struct inode *inode, struct file *file)
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{
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struct pcm *pcm;
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pr_info("[%s:%s] open\n", __MM_FILE__, __func__);
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pcm = kzalloc(sizeof(struct pcm), GFP_KERNEL);
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if (!pcm)
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return -ENOMEM;
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mutex_init(&pcm->lock);
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pcm->channel_count = 2;
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pcm->sample_rate = 44100;
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pcm->buffer_size = BUFSZ;
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file->private_data = pcm;
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return 0;
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}
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static ssize_t pcm_write(struct file *file, const char __user *buf,
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size_t count, loff_t *pos)
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{
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struct pcm *pcm = file->private_data;
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struct audio_client *ac;
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struct audio_buffer *ab;
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const char __user *start = buf;
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int xfer;
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pr_debug("[%s:%s] count = %d\n", __MM_FILE__, __func__, count);
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if (!pcm->ac)
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pcm_ioctl(file, AUDIO_START, 0);
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ac = pcm->ac;
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if (!ac)
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return -ENODEV;
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while (count > 0) {
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ab = ac->buf + ac->cpu_buf;
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if (ab->used)
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if (!wait_event_timeout(ac->wait, (ab->used == 0), 5*HZ)) {
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audio_client_dump(ac);
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pr_err("[%s:%s] timeout. dsp dead?\n",
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__MM_FILE__, __func__);
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q6audio_dsp_not_responding();
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}
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pr_debug("[%s:%s] ab->data = %p, cpu_buf = %d", __MM_FILE__,
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__func__, ab->data, ac->cpu_buf);
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xfer = count;
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if (xfer > ab->size)
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xfer = ab->size;
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if (copy_from_user(ab->data, buf, xfer))
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return -EFAULT;
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buf += xfer;
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count -= xfer;
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ab->used = 1;
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ab->actual_size = xfer;
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q6audio_write(ac, ab);
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ac->cpu_buf ^= 1;
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}
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return buf - start;
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}
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static int pcm_release(struct inode *inode, struct file *file)
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{
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struct pcm *pcm = file->private_data;
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if (pcm->ac)
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q6audio_close(pcm->ac);
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kfree(pcm);
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pr_info("[%s:%s] release\n", __MM_FILE__, __func__);
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return 0;
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}
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static struct file_operations pcm_fops = {
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.owner = THIS_MODULE,
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.open = pcm_open,
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.write = pcm_write,
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.release = pcm_release,
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.unlocked_ioctl = pcm_ioctl,
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};
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struct miscdevice pcm_misc = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "msm_pcm_out",
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.fops = &pcm_fops,
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};
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static int __init pcm_init(void) {
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return misc_register(&pcm_misc);
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}
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device_initcall(pcm_init);
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