V4L/DVB: cx18: overhaul ALSA PCM device handling so it works
Add code so that the PCM ALSA device actually works, and update the cx18-streams mechanism so that it passes the data off to the cx18-alsa module. This work was sponsored by ONELAN Limited. Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Devin Heitmueller
Mauro Carvalho Chehab
parent
8ef22f794e
commit
9972de9042
5 changed files with 293 additions and 7 deletions
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@ -3,6 +3,9 @@
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* ALSA interface to cx18 PCM capture streams
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*
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* Copyright (C) 2009 Andy Walls <awalls@radix.net>
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* Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
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*
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* Portions of this work were sponsored by ONELAN Limited.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -29,8 +32,44 @@
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#include <sound/pcm.h>
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#include "cx18-driver.h"
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#include "cx18-queue.h"
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#include "cx18-streams.h"
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#include "cx18-fileops.h"
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#include "cx18-alsa.h"
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extern int cx18_alsa_debug;
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#define dprintk(fmt, arg...) do { \
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if (cx18_alsa_debug) \
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printk(KERN_INFO "cx18-alsa %s: " fmt, \
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__func__, ##arg); \
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} while (0)
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/* Forward Declaration */
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void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data,
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size_t num_bytes);
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static struct snd_pcm_hardware snd_cx18_hw_capture = {
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.info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_MMAP_VALID,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
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.rate_min = 48000,
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.rate_max = 48000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
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.period_bytes_min = 64, /* 12544/2, */
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.period_bytes_max = 12544,
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.periods_min = 2,
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.periods_max = 98, /* 12544, */
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};
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static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream)
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{
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struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
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@ -38,11 +77,76 @@ static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream)
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struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
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struct snd_card *sc = cxsc->sc;
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struct cx18 *cx = to_cx18(v4l2_dev);
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struct cx18_stream *s;
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struct cx18_open_id *item;
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int ret;
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/* Instruct the cx18 to start sending packets */
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s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
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/* Allocate memory */
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item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
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if (NULL == item) {
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CX18_DEBUG_WARN("nomem on v4l2 open\n");
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return -ENOMEM;
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}
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item->cx = cx;
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item->type = s->type;
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item->open_id = cx->open_id++;
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/* See if the stream is available */
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if (cx18_claim_stream(item, item->type)) {
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/* No, it's already in use */
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return -EBUSY;
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}
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if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
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test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
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/* We're already streaming. No additional action required */
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return 0;
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}
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runtime->hw = snd_cx18_hw_capture;
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snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
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cxsc->capture_pcm_substream = substream;
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runtime->private_data = cx;
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cx->pcm_announce_callback = cx18_alsa_announce_pcm_data;
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/* Not currently streaming, so start it up */
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set_bit(CX18_F_S_STREAMING, &s->s_flags);
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ret = cx18_start_v4l2_encode_stream(s);
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return 0;
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}
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static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream)
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{
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unsigned long flags;
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struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
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struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
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struct cx18 *cx = to_cx18(v4l2_dev);
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struct cx18_stream *s;
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int ret;
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/* Instruct the cx18 to stop sending packets */
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s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
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ret = cx18_stop_v4l2_encode_stream(s, 0);
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clear_bit(CX18_F_S_STREAMING, &s->s_flags);
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cx18_release_stream(s);
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cx->pcm_announce_callback = NULL;
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spin_lock_irqsave(&cxsc->slock, flags);
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if (substream->runtime->dma_area) {
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dprintk("freeing pcm capture region\n");
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vfree(substream->runtime->dma_area);
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substream->runtime->dma_area = NULL;
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}
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spin_unlock_irqrestore(&cxsc->slock, flags);
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return 0;
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}
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@ -52,9 +156,37 @@ static int snd_cx18_pcm_ioctl(struct snd_pcm_substream *substream,
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return snd_pcm_lib_ioctl(substream, cmd, arg);
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}
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static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
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size_t size)
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{
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struct snd_pcm_runtime *runtime = subs->runtime;
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dprintk("Allocating vbuffer\n");
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if (runtime->dma_area) {
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if (runtime->dma_bytes > size)
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return 0;
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vfree(runtime->dma_area);
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}
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runtime->dma_area = vmalloc(size);
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if (!runtime->dma_area)
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return -ENOMEM;
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runtime->dma_bytes = size;
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return 0;
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}
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static int snd_cx18_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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int ret;
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dprintk("%s called\n", __func__);
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ret = snd_pcm_alloc_vmalloc_buffer(substream,
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params_buffer_bytes(params));
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return 0;
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}
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@ -65,6 +197,11 @@ static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream)
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static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
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cxsc->hwptr_done_capture = 0;
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cxsc->capture_transfer_done = 0;
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return 0;
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}
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@ -76,7 +213,24 @@ static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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static
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snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream)
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{
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return 0;
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unsigned long flags;
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snd_pcm_uframes_t hwptr_done;
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struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
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spin_lock_irqsave(&cxsc->slock, flags);
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hwptr_done = cxsc->hwptr_done_capture;
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spin_unlock_irqrestore(&cxsc->slock, flags);
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return hwptr_done;
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}
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static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
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unsigned long offset)
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{
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void *pageptr = subs->runtime->dma_area + offset;
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return vmalloc_to_page(pageptr);
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}
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static struct snd_pcm_ops snd_cx18_pcm_capture_ops = {
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@ -88,9 +242,86 @@ static struct snd_pcm_ops snd_cx18_pcm_capture_ops = {
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.prepare = snd_cx18_pcm_prepare,
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.trigger = snd_cx18_pcm_trigger,
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.pointer = snd_cx18_pcm_pointer,
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.page = snd_pcm_get_vmalloc_page,
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};
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int __init snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
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void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data,
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size_t num_bytes)
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{
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struct snd_pcm_substream *substream;
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struct snd_pcm_runtime *runtime;
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unsigned int oldptr;
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unsigned int stride;
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int period_elapsed = 0;
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int length;
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dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%d\n", cxsc,
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pcm_data, num_bytes);
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substream = cxsc->capture_pcm_substream;
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if (substream == NULL) {
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dprintk("substream was NULL\n");
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return;
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}
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runtime = substream->runtime;
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if (runtime == NULL) {
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dprintk("runtime was NULL\n");
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return;
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}
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stride = runtime->frame_bits >> 3;
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if (stride == 0) {
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dprintk("stride is zero\n");
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return;
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}
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length = num_bytes / stride;
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if (length == 0) {
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dprintk("%s: length was zero\n", __func__);
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return;
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}
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if (runtime->dma_area == NULL) {
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dprintk("dma area was NULL - ignoring\n");
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return;
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}
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oldptr = cxsc->hwptr_done_capture;
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if (oldptr + length >= runtime->buffer_size) {
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unsigned int cnt =
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runtime->buffer_size - oldptr;
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memcpy(runtime->dma_area + oldptr * stride, pcm_data,
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cnt * stride);
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memcpy(runtime->dma_area, pcm_data + cnt * stride,
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length * stride - cnt * stride);
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} else {
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memcpy(runtime->dma_area + oldptr * stride, pcm_data,
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length * stride);
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}
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snd_pcm_stream_lock(substream);
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cxsc->hwptr_done_capture += length;
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if (cxsc->hwptr_done_capture >=
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runtime->buffer_size)
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cxsc->hwptr_done_capture -=
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runtime->buffer_size;
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cxsc->capture_transfer_done += length;
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if (cxsc->capture_transfer_done >=
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runtime->period_size) {
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cxsc->capture_transfer_done -=
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runtime->period_size;
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period_elapsed = 1;
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}
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snd_pcm_stream_unlock(substream);
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if (period_elapsed)
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snd_pcm_period_elapsed(substream);
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}
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int snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
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{
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struct snd_pcm *sp;
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struct snd_card *sc = cxsc->sc;
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@ -108,6 +339,14 @@ int __init snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
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__func__, ret);
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goto err_exit;
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}
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spin_lock_init(&cxsc->slock);
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snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE, &snd_cx18_pcm_capture_ops);
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sp->info_flags = 0;
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sp->private_data = cxsc;
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strcpy(sp->name, "Conexant cx23418 Capture");
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return 0;
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err_exit:
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@ -21,3 +21,7 @@
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*/
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int __init snd_cx18_pcm_create(struct snd_cx18_card *cxsc);
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/* Used by cx18-mailbox to announce the PCM data to the module */
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void cx18_alsa_announce_pcm_data(struct snd_cx18_card *card, u8 *pcm_data,
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size_t num_bytes);
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@ -24,6 +24,10 @@ struct snd_card;
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struct snd_cx18_card {
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struct v4l2_device *v4l2_dev;
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struct snd_card *sc;
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unsigned int capture_transfer_done;
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unsigned int hwptr_done_capture;
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struct snd_pcm_substream *capture_pcm_substream;
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spinlock_t slock;
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};
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extern int cx18_alsa_debug;
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@ -575,6 +575,9 @@ struct cx18 {
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int stream_buf_size[CX18_MAX_STREAMS]; /* Stream buffer size */
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struct cx18_stream streams[CX18_MAX_STREAMS]; /* Stream data */
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struct snd_cx18_card *alsa; /* ALSA interface for PCM capture stream */
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void (*pcm_announce_callback)(struct snd_cx18_card *card, u8 *pcm_data,
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size_t num_bytes);
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unsigned long i_flags; /* global cx18 flags */
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atomic_t ana_capturing; /* count number of active analog capture streams */
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atomic_t tot_capturing; /* total count number of active capture streams */
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@ -29,6 +29,7 @@
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#include "cx18-mailbox.h"
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#include "cx18-queue.h"
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#include "cx18-streams.h"
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#include "cx18-alsa-pcm.h" /* FIXME make configurable */
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static const char *rpu_str[] = { "APU", "CPU", "EPU", "HPU" };
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@ -157,6 +158,34 @@ static void cx18_mdl_send_to_dvb(struct cx18_stream *s, struct cx18_mdl *mdl)
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}
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}
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static void cx18_mdl_send_to_alsa(struct cx18 *cx, struct cx18_stream *s,
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struct cx18_mdl *mdl)
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{
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struct cx18_buffer *buf;
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if (mdl->bytesused == 0)
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return;
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/* We ignore mdl and buf readpos accounting here - it doesn't matter */
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/* The likely case */
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if (list_is_singular(&mdl->buf_list)) {
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buf = list_first_entry(&mdl->buf_list, struct cx18_buffer,
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list);
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if (buf->bytesused)
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cx->pcm_announce_callback(cx->alsa, buf->buf,
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buf->bytesused);
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return;
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}
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list_for_each_entry(buf, &mdl->buf_list, list) {
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if (buf->bytesused == 0)
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break;
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cx->pcm_announce_callback(cx->alsa, buf->buf, buf->bytesused);
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}
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}
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static void epu_dma_done(struct cx18 *cx, struct cx18_in_work_order *order)
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{
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u32 handle, mdl_ack_count, id;
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@ -223,15 +252,22 @@ static void epu_dma_done(struct cx18 *cx, struct cx18_in_work_order *order)
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CX18_DEBUG_HI_DMA("%s recv bytesused = %d\n",
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s->name, mdl->bytesused);
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if (s->type != CX18_ENC_STREAM_TYPE_TS) {
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if (s->type == CX18_ENC_STREAM_TYPE_TS) {
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cx18_mdl_send_to_dvb(s, mdl);
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cx18_enqueue(s, mdl, &s->q_free);
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} else if (s->type == CX18_ENC_STREAM_TYPE_PCM) {
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/* Pass the data to cx18-alsa */
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if (cx->pcm_announce_callback != NULL) {
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cx18_mdl_send_to_alsa(cx, s, mdl);
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cx18_enqueue(s, mdl, &s->q_free);
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} else {
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cx18_enqueue(s, mdl, &s->q_full);
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}
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} else {
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cx18_enqueue(s, mdl, &s->q_full);
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if (s->type == CX18_ENC_STREAM_TYPE_IDX)
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cx18_stream_rotate_idx_mdls(cx);
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}
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else {
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cx18_mdl_send_to_dvb(s, mdl);
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cx18_enqueue(s, mdl, &s->q_free);
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}
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}
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/* Put as many MDLs as possible back into fw use */
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cx18_stream_load_fw_queue(s);
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