273 lines
6.6 KiB
C
273 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ALSA PCM device for the
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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@md.metrocast.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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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <media/v4l2-device.h>
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#include <sound/core.h>
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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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#include "cx18-alsa-pcm.h"
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static unsigned int pcm_debug;
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module_param(pcm_debug, int, 0644);
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MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
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#define dprintk(fmt, arg...) do { \
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if (pcm_debug) \
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printk(KERN_INFO "cx18-alsa-pcm %s: " fmt, \
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__func__, ##arg); \
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} while (0)
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static const 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_48000,
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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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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=%zu\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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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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struct snd_pcm_runtime *runtime = substream->runtime;
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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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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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snd_cx18_lock(cxsc);
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s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
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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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snd_cx18_unlock(cxsc);
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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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snd_cx18_unlock(cxsc);
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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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snd_cx18_unlock(cxsc);
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return ret;
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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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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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/* Instruct the cx18 to stop sending packets */
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snd_cx18_lock(cxsc);
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s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
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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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snd_cx18_unlock(cxsc);
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return 0;
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}
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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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static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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return 0;
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}
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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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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 const struct snd_pcm_ops snd_cx18_pcm_capture_ops = {
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.open = snd_cx18_pcm_capture_open,
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.close = snd_cx18_pcm_capture_close,
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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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};
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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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struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
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struct cx18 *cx = to_cx18(v4l2_dev);
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int ret;
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ret = snd_pcm_new(sc, "CX23418 PCM",
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0, /* PCM device 0, the only one for this card */
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0, /* 0 playback substreams */
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1, /* 1 capture substream */
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&sp);
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if (ret) {
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CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
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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,
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&snd_cx18_pcm_capture_ops);
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snd_pcm_set_managed_buffer_all(sp, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
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sp->info_flags = 0;
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sp->private_data = cxsc;
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strscpy(sp->name, cx->card_name, sizeof(sp->name));
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return 0;
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err_exit:
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return ret;
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}
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