351 lines
8.4 KiB
C
351 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* ALSA PCM device for the
|
|
* ALSA interface to ivtv PCM capture streams
|
|
*
|
|
* Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net>
|
|
* Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
|
|
*
|
|
* Portions of this work were sponsored by ONELAN Limited for the cx18 driver
|
|
*/
|
|
|
|
#include "ivtv-driver.h"
|
|
#include "ivtv-queue.h"
|
|
#include "ivtv-streams.h"
|
|
#include "ivtv-fileops.h"
|
|
#include "ivtv-alsa.h"
|
|
#include "ivtv-alsa-pcm.h"
|
|
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
|
|
|
|
static unsigned int pcm_debug;
|
|
module_param(pcm_debug, int, 0644);
|
|
MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
|
|
|
|
#define dprintk(fmt, arg...) \
|
|
do { \
|
|
if (pcm_debug) \
|
|
pr_info("ivtv-alsa-pcm %s: " fmt, __func__, ##arg); \
|
|
} while (0)
|
|
|
|
static const struct snd_pcm_hardware snd_ivtv_hw_capture = {
|
|
.info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
|
|
SNDRV_PCM_INFO_MMAP |
|
|
SNDRV_PCM_INFO_INTERLEAVED |
|
|
SNDRV_PCM_INFO_MMAP_VALID,
|
|
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE,
|
|
|
|
.rates = SNDRV_PCM_RATE_48000,
|
|
|
|
.rate_min = 48000,
|
|
.rate_max = 48000,
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
|
|
.period_bytes_min = 64, /* 12544/2, */
|
|
.period_bytes_max = 12544,
|
|
.periods_min = 2,
|
|
.periods_max = 98, /* 12544, */
|
|
};
|
|
|
|
static void ivtv_alsa_announce_pcm_data(struct snd_ivtv_card *itvsc,
|
|
u8 *pcm_data,
|
|
size_t num_bytes)
|
|
{
|
|
struct snd_pcm_substream *substream;
|
|
struct snd_pcm_runtime *runtime;
|
|
unsigned int oldptr;
|
|
unsigned int stride;
|
|
int period_elapsed = 0;
|
|
int length;
|
|
|
|
dprintk("ivtv alsa announce ptr=%p data=%p num_bytes=%zu\n", itvsc,
|
|
pcm_data, num_bytes);
|
|
|
|
substream = itvsc->capture_pcm_substream;
|
|
if (substream == NULL) {
|
|
dprintk("substream was NULL\n");
|
|
return;
|
|
}
|
|
|
|
runtime = substream->runtime;
|
|
if (runtime == NULL) {
|
|
dprintk("runtime was NULL\n");
|
|
return;
|
|
}
|
|
|
|
stride = runtime->frame_bits >> 3;
|
|
if (stride == 0) {
|
|
dprintk("stride is zero\n");
|
|
return;
|
|
}
|
|
|
|
length = num_bytes / stride;
|
|
if (length == 0) {
|
|
dprintk("%s: length was zero\n", __func__);
|
|
return;
|
|
}
|
|
|
|
if (runtime->dma_area == NULL) {
|
|
dprintk("dma area was NULL - ignoring\n");
|
|
return;
|
|
}
|
|
|
|
oldptr = itvsc->hwptr_done_capture;
|
|
if (oldptr + length >= runtime->buffer_size) {
|
|
unsigned int cnt =
|
|
runtime->buffer_size - oldptr;
|
|
memcpy(runtime->dma_area + oldptr * stride, pcm_data,
|
|
cnt * stride);
|
|
memcpy(runtime->dma_area, pcm_data + cnt * stride,
|
|
length * stride - cnt * stride);
|
|
} else {
|
|
memcpy(runtime->dma_area + oldptr * stride, pcm_data,
|
|
length * stride);
|
|
}
|
|
snd_pcm_stream_lock(substream);
|
|
|
|
itvsc->hwptr_done_capture += length;
|
|
if (itvsc->hwptr_done_capture >=
|
|
runtime->buffer_size)
|
|
itvsc->hwptr_done_capture -=
|
|
runtime->buffer_size;
|
|
|
|
itvsc->capture_transfer_done += length;
|
|
if (itvsc->capture_transfer_done >=
|
|
runtime->period_size) {
|
|
itvsc->capture_transfer_done -=
|
|
runtime->period_size;
|
|
period_elapsed = 1;
|
|
}
|
|
|
|
snd_pcm_stream_unlock(substream);
|
|
|
|
if (period_elapsed)
|
|
snd_pcm_period_elapsed(substream);
|
|
}
|
|
|
|
static int snd_ivtv_pcm_capture_open(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
|
|
struct ivtv *itv = to_ivtv(v4l2_dev);
|
|
struct ivtv_stream *s;
|
|
struct ivtv_open_id item;
|
|
int ret;
|
|
|
|
/* Instruct the CX2341[56] to start sending packets */
|
|
snd_ivtv_lock(itvsc);
|
|
|
|
if (ivtv_init_on_first_open(itv)) {
|
|
snd_ivtv_unlock(itvsc);
|
|
return -ENXIO;
|
|
}
|
|
|
|
s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
|
|
|
|
v4l2_fh_init(&item.fh, &s->vdev);
|
|
item.itv = itv;
|
|
item.type = s->type;
|
|
|
|
/* See if the stream is available */
|
|
if (ivtv_claim_stream(&item, item.type)) {
|
|
/* No, it's already in use */
|
|
v4l2_fh_exit(&item.fh);
|
|
snd_ivtv_unlock(itvsc);
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) ||
|
|
test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
|
|
/* We're already streaming. No additional action required */
|
|
snd_ivtv_unlock(itvsc);
|
|
return 0;
|
|
}
|
|
|
|
|
|
runtime->hw = snd_ivtv_hw_capture;
|
|
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
|
|
itvsc->capture_pcm_substream = substream;
|
|
runtime->private_data = itv;
|
|
|
|
itv->pcm_announce_callback = ivtv_alsa_announce_pcm_data;
|
|
|
|
/* Not currently streaming, so start it up */
|
|
set_bit(IVTV_F_S_STREAMING, &s->s_flags);
|
|
ret = ivtv_start_v4l2_encode_stream(s);
|
|
snd_ivtv_unlock(itvsc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int snd_ivtv_pcm_capture_close(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
|
|
struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
|
|
struct ivtv *itv = to_ivtv(v4l2_dev);
|
|
struct ivtv_stream *s;
|
|
|
|
/* Instruct the ivtv to stop sending packets */
|
|
snd_ivtv_lock(itvsc);
|
|
s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
|
|
ivtv_stop_v4l2_encode_stream(s, 0);
|
|
clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
|
|
|
|
ivtv_release_stream(s);
|
|
|
|
itv->pcm_announce_callback = NULL;
|
|
snd_ivtv_unlock(itvsc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ivtv_pcm_ioctl(struct snd_pcm_substream *substream,
|
|
unsigned int cmd, void *arg)
|
|
{
|
|
struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
|
|
int ret;
|
|
|
|
snd_ivtv_lock(itvsc);
|
|
ret = snd_pcm_lib_ioctl(substream, cmd, arg);
|
|
snd_ivtv_unlock(itvsc);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
|
|
size_t size)
|
|
{
|
|
struct snd_pcm_runtime *runtime = subs->runtime;
|
|
|
|
dprintk("Allocating vbuffer\n");
|
|
if (runtime->dma_area) {
|
|
if (runtime->dma_bytes > size)
|
|
return 0;
|
|
|
|
vfree(runtime->dma_area);
|
|
}
|
|
runtime->dma_area = vmalloc(size);
|
|
if (!runtime->dma_area)
|
|
return -ENOMEM;
|
|
|
|
runtime->dma_bytes = size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ivtv_pcm_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
dprintk("%s called\n", __func__);
|
|
|
|
return snd_pcm_alloc_vmalloc_buffer(substream,
|
|
params_buffer_bytes(params));
|
|
}
|
|
|
|
static int snd_ivtv_pcm_hw_free(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
|
|
unsigned long flags;
|
|
unsigned char *dma_area = NULL;
|
|
|
|
spin_lock_irqsave(&itvsc->slock, flags);
|
|
if (substream->runtime->dma_area) {
|
|
dprintk("freeing pcm capture region\n");
|
|
dma_area = substream->runtime->dma_area;
|
|
substream->runtime->dma_area = NULL;
|
|
}
|
|
spin_unlock_irqrestore(&itvsc->slock, flags);
|
|
vfree(dma_area);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ivtv_pcm_prepare(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
|
|
|
|
itvsc->hwptr_done_capture = 0;
|
|
itvsc->capture_transfer_done = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ivtv_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static
|
|
snd_pcm_uframes_t snd_ivtv_pcm_pointer(struct snd_pcm_substream *substream)
|
|
{
|
|
unsigned long flags;
|
|
snd_pcm_uframes_t hwptr_done;
|
|
struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
|
|
|
|
spin_lock_irqsave(&itvsc->slock, flags);
|
|
hwptr_done = itvsc->hwptr_done_capture;
|
|
spin_unlock_irqrestore(&itvsc->slock, flags);
|
|
|
|
return hwptr_done;
|
|
}
|
|
|
|
static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
|
|
unsigned long offset)
|
|
{
|
|
void *pageptr = subs->runtime->dma_area + offset;
|
|
|
|
return vmalloc_to_page(pageptr);
|
|
}
|
|
|
|
static const struct snd_pcm_ops snd_ivtv_pcm_capture_ops = {
|
|
.open = snd_ivtv_pcm_capture_open,
|
|
.close = snd_ivtv_pcm_capture_close,
|
|
.ioctl = snd_ivtv_pcm_ioctl,
|
|
.hw_params = snd_ivtv_pcm_hw_params,
|
|
.hw_free = snd_ivtv_pcm_hw_free,
|
|
.prepare = snd_ivtv_pcm_prepare,
|
|
.trigger = snd_ivtv_pcm_trigger,
|
|
.pointer = snd_ivtv_pcm_pointer,
|
|
.page = snd_pcm_get_vmalloc_page,
|
|
};
|
|
|
|
int snd_ivtv_pcm_create(struct snd_ivtv_card *itvsc)
|
|
{
|
|
struct snd_pcm *sp;
|
|
struct snd_card *sc = itvsc->sc;
|
|
struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
|
|
struct ivtv *itv = to_ivtv(v4l2_dev);
|
|
int ret;
|
|
|
|
ret = snd_pcm_new(sc, "CX2341[56] PCM",
|
|
0, /* PCM device 0, the only one for this card */
|
|
0, /* 0 playback substreams */
|
|
1, /* 1 capture substream */
|
|
&sp);
|
|
if (ret) {
|
|
IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
|
|
__func__, ret);
|
|
goto err_exit;
|
|
}
|
|
|
|
spin_lock_init(&itvsc->slock);
|
|
|
|
snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
|
|
&snd_ivtv_pcm_capture_ops);
|
|
sp->info_flags = 0;
|
|
sp->private_data = itvsc;
|
|
strscpy(sp->name, itv->card_name, sizeof(sp->name));
|
|
|
|
return 0;
|
|
|
|
err_exit:
|
|
return ret;
|
|
}
|