// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ALSA PCM device for the
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* ALSA interface to cobalt PCM capture streams
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*
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* Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates.
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* All rights reserved.
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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 <linux/delay.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 "cobalt-driver.h"
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#include "cobalt-alsa.h"
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#include "cobalt-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...) \
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do { \
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if (pcm_debug) \
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pr_info("cobalt-alsa-pcm %s: " fmt, __func__, ##arg); \
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} while (0)
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static const struct snd_pcm_hardware snd_cobalt_hdmi_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 | SNDRV_PCM_FMTBIT_S32_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 = 1,
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.channels_max = 8,
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.buffer_bytes_max = 4 * 240 * 8 * 4, /* 5 ms of data */
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.period_bytes_min = 1920, /* 1 sample = 8 * 4 bytes */
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.period_bytes_max = 240 * 8 * 4, /* 5 ms of 8 channel data */
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.periods_min = 1,
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.periods_max = 4,
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};
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static const struct snd_pcm_hardware snd_cobalt_playback = {
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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 | SNDRV_PCM_FMTBIT_S32_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 = 1,
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.channels_max = 8,
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.buffer_bytes_max = 4 * 240 * 8 * 4, /* 5 ms of data */
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.period_bytes_min = 1920, /* 1 sample = 8 * 4 bytes */
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.period_bytes_max = 240 * 8 * 4, /* 5 ms of 8 channel data */
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.periods_min = 1,
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.periods_max = 4,
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};
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static void sample_cpy(u8 *dst, const u8 *src, u32 len, bool is_s32)
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{
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static const unsigned map[8] = { 0, 1, 5, 4, 2, 3, 6, 7 };
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unsigned idx = 0;
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while (len >= (is_s32 ? 4 : 2)) {
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unsigned offset = map[idx] * 4;
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u32 val = src[offset + 1] + (src[offset + 2] << 8) +
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(src[offset + 3] << 16);
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if (is_s32) {
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*dst++ = 0;
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*dst++ = val & 0xff;
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}
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*dst++ = (val >> 8) & 0xff;
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*dst++ = (val >> 16) & 0xff;
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len -= is_s32 ? 4 : 2;
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idx++;
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}
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}
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static void cobalt_alsa_announce_pcm_data(struct snd_cobalt_card *cobsc,
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u8 *pcm_data,
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size_t skip,
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size_t samples)
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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 long flags;
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unsigned int oldptr;
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unsigned int stride;
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int length = samples;
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int period_elapsed = 0;
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bool is_s32;
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dprintk("cobalt alsa announce ptr=%p data=%p num_bytes=%zd\n", cobsc,
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pcm_data, samples);
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substream = cobsc->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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is_s32 = runtime->format == SNDRV_PCM_FORMAT_S32_LE;
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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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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 = cobsc->hwptr_done_capture;
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if (oldptr + length >= runtime->buffer_size) {
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unsigned int cnt = runtime->buffer_size - oldptr;
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unsigned i;
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for (i = 0; i < cnt; i++)
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sample_cpy(runtime->dma_area + (oldptr + i) * stride,
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pcm_data + i * skip,
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stride, is_s32);
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for (i = cnt; i < length; i++)
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sample_cpy(runtime->dma_area + (i - cnt) * stride,
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pcm_data + i * skip, stride, is_s32);
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} else {
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unsigned i;
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for (i = 0; i < length; i++)
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sample_cpy(runtime->dma_area + (oldptr + i) * stride,
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pcm_data + i * skip,
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stride, is_s32);
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}
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snd_pcm_stream_lock_irqsave(substream, flags);
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cobsc->hwptr_done_capture += length;
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if (cobsc->hwptr_done_capture >=
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runtime->buffer_size)
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cobsc->hwptr_done_capture -=
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runtime->buffer_size;
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cobsc->capture_transfer_done += length;
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if (cobsc->capture_transfer_done >=
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runtime->period_size) {
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cobsc->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_irqrestore(substream, flags);
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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 alsa_fnc(struct vb2_buffer *vb, void *priv)
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{
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struct cobalt_stream *s = priv;
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unsigned char *p = vb2_plane_vaddr(vb, 0);
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int i;
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if (pcm_debug) {
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pr_info("alsa: ");
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for (i = 0; i < 8 * 4; i++) {
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if (!(i & 3))
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pr_cont(" ");
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pr_cont("%02x", p[i]);
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}
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pr_cont("\n");
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}
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cobalt_alsa_announce_pcm_data(s->alsa,
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vb2_plane_vaddr(vb, 0),
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8 * 4,
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vb2_get_plane_payload(vb, 0) / (8 * 4));
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return 0;
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}
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static int snd_cobalt_pcm_capture_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
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struct cobalt_stream *s = cobsc->s;
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runtime->hw = snd_cobalt_hdmi_capture;
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snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
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cobsc->capture_pcm_substream = substream;
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runtime->private_data = s;
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cobsc->alsa_record_cnt++;
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if (cobsc->alsa_record_cnt == 1) {
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int rc;
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rc = vb2_thread_start(&s->q, alsa_fnc, s, s->vdev.name);
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if (rc) {
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cobsc->alsa_record_cnt--;
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return rc;
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}
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}
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return 0;
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}
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static int snd_cobalt_pcm_capture_close(struct snd_pcm_substream *substream)
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{
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struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
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struct cobalt_stream *s = cobsc->s;
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cobsc->alsa_record_cnt--;
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if (cobsc->alsa_record_cnt == 0)
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vb2_thread_stop(&s->q);
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return 0;
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}
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static int snd_cobalt_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
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cobsc->hwptr_done_capture = 0;
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cobsc->capture_transfer_done = 0;
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return 0;
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}
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static int snd_cobalt_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_STOP:
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return 0;
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default:
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return -EINVAL;
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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_cobalt_pcm_pointer(struct snd_pcm_substream *substream)
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{
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snd_pcm_uframes_t hwptr_done;
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struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
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hwptr_done = cobsc->hwptr_done_capture;
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return hwptr_done;
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}
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static void pb_sample_cpy(u8 *dst, const u8 *src, u32 len, bool is_s32)
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{
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static const unsigned map[8] = { 0, 1, 5, 4, 2, 3, 6, 7 };
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unsigned idx = 0;
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while (len >= (is_s32 ? 4 : 2)) {
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unsigned offset = map[idx] * 4;
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u8 *out = dst + offset;
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*out++ = 0;
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if (is_s32) {
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src++;
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*out++ = *src++;
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} else {
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*out++ = 0;
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}
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*out++ = *src++;
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*out = *src++;
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len -= is_s32 ? 4 : 2;
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idx++;
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}
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}
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static void cobalt_alsa_pb_pcm_data(struct snd_cobalt_card *cobsc,
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u8 *pcm_data,
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size_t skip,
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size_t samples)
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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 long flags;
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unsigned int pos;
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unsigned int stride;
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bool is_s32;
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unsigned i;
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dprintk("cobalt alsa pb ptr=%p data=%p samples=%zd\n", cobsc,
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pcm_data, samples);
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substream = cobsc->playback_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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is_s32 = runtime->format == SNDRV_PCM_FORMAT_S32_LE;
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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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if (samples == 0) {
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dprintk("%s: samples 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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pos = cobsc->pb_pos % cobsc->pb_size;
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for (i = 0; i < cobsc->pb_count / (8 * 4); i++)
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pb_sample_cpy(pcm_data + i * skip,
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runtime->dma_area + pos + i * stride,
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stride, is_s32);
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snd_pcm_stream_lock_irqsave(substream, flags);
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cobsc->pb_pos += i * stride;
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snd_pcm_stream_unlock_irqrestore(substream, flags);
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if (cobsc->pb_pos % cobsc->pb_count == 0)
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snd_pcm_period_elapsed(substream);
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}
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static int alsa_pb_fnc(struct vb2_buffer *vb, void *priv)
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{
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struct cobalt_stream *s = priv;
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if (s->alsa->alsa_pb_channel)
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cobalt_alsa_pb_pcm_data(s->alsa,
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vb2_plane_vaddr(vb, 0),
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8 * 4,
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vb2_get_plane_payload(vb, 0) / (8 * 4));
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return 0;
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}
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static int snd_cobalt_pcm_playback_open(struct snd_pcm_substream *substream)
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{
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struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct cobalt_stream *s = cobsc->s;
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runtime->hw = snd_cobalt_playback;
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snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
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cobsc->playback_pcm_substream = substream;
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runtime->private_data = s;
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cobsc->alsa_playback_cnt++;
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if (cobsc->alsa_playback_cnt == 1) {
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int rc;
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rc = vb2_thread_start(&s->q, alsa_pb_fnc, s, s->vdev.name);
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if (rc) {
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cobsc->alsa_playback_cnt--;
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return rc;
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}
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}
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return 0;
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}
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static int snd_cobalt_pcm_playback_close(struct snd_pcm_substream *substream)
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{
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struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
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struct cobalt_stream *s = cobsc->s;
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cobsc->alsa_playback_cnt--;
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if (cobsc->alsa_playback_cnt == 0)
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vb2_thread_stop(&s->q);
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return 0;
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}
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static int snd_cobalt_pcm_pb_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
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cobsc->pb_size = snd_pcm_lib_buffer_bytes(substream);
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cobsc->pb_count = snd_pcm_lib_period_bytes(substream);
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cobsc->pb_pos = 0;
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return 0;
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}
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static int snd_cobalt_pcm_pb_trigger(struct snd_pcm_substream *substream,
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int cmd)
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{
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struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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if (cobsc->alsa_pb_channel)
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return -EBUSY;
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cobsc->alsa_pb_channel = true;
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return 0;
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case SNDRV_PCM_TRIGGER_STOP:
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cobsc->alsa_pb_channel = false;
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return 0;
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default:
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return -EINVAL;
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}
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}
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static
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snd_pcm_uframes_t snd_cobalt_pcm_pb_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
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size_t ptr;
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ptr = cobsc->pb_pos;
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return bytes_to_frames(substream->runtime, ptr) %
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substream->runtime->buffer_size;
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}
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static const struct snd_pcm_ops snd_cobalt_pcm_capture_ops = {
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.open = snd_cobalt_pcm_capture_open,
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.close = snd_cobalt_pcm_capture_close,
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.prepare = snd_cobalt_pcm_prepare,
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.trigger = snd_cobalt_pcm_trigger,
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.pointer = snd_cobalt_pcm_pointer,
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};
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static const struct snd_pcm_ops snd_cobalt_pcm_playback_ops = {
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.open = snd_cobalt_pcm_playback_open,
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.close = snd_cobalt_pcm_playback_close,
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.prepare = snd_cobalt_pcm_pb_prepare,
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.trigger = snd_cobalt_pcm_pb_trigger,
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.pointer = snd_cobalt_pcm_pb_pointer,
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};
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int snd_cobalt_pcm_create(struct snd_cobalt_card *cobsc)
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{
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struct snd_pcm *sp;
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struct snd_card *sc = cobsc->sc;
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struct cobalt_stream *s = cobsc->s;
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struct cobalt *cobalt = s->cobalt;
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int ret;
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s->q.gfp_flags |= __GFP_ZERO;
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if (!s->is_output) {
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cobalt_s_bit_sysctrl(cobalt,
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COBALT_SYS_CTRL_AUDIO_IPP_RESETN_BIT(s->video_channel),
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0);
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mdelay(2);
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cobalt_s_bit_sysctrl(cobalt,
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COBALT_SYS_CTRL_AUDIO_IPP_RESETN_BIT(s->video_channel),
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1);
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mdelay(1);
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ret = snd_pcm_new(sc, "Cobalt PCM-In HDMI",
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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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cobalt_err("snd_cobalt_pcm_create() failed for input with err %d\n",
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ret);
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goto err_exit;
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}
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snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
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&snd_cobalt_pcm_capture_ops);
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snd_pcm_set_managed_buffer_all(sp, SNDRV_DMA_TYPE_VMALLOC,
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NULL, 0, 0);
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sp->info_flags = 0;
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sp->private_data = cobsc;
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strscpy(sp->name, "cobalt", sizeof(sp->name));
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} else {
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cobalt_s_bit_sysctrl(cobalt,
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COBALT_SYS_CTRL_AUDIO_OPP_RESETN_BIT, 0);
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mdelay(2);
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cobalt_s_bit_sysctrl(cobalt,
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COBALT_SYS_CTRL_AUDIO_OPP_RESETN_BIT, 1);
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mdelay(1);
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ret = snd_pcm_new(sc, "Cobalt PCM-Out HDMI",
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0, /* PCM device 0, the only one for this card */
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1, /* 0 playback substreams */
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0, /* 1 capture substream */
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&sp);
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if (ret) {
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cobalt_err("snd_cobalt_pcm_create() failed for output with err %d\n",
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ret);
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goto err_exit;
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}
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snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_PLAYBACK,
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&snd_cobalt_pcm_playback_ops);
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snd_pcm_set_managed_buffer_all(sp, SNDRV_DMA_TYPE_VMALLOC,
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NULL, 0, 0);
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sp->info_flags = 0;
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sp->private_data = cobsc;
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strscpy(sp->name, "cobalt", sizeof(sp->name));
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}
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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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