* ALSA interface to cx18 PCM capture streams
*
* Copyright (C) 2009 Andy Walls <awalls@radix.net>
+ * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
+ *
+ * Portions of this work were sponsored by ONELAN Limited.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <sound/pcm.h>
#include "cx18-driver.h"
+#include "cx18-queue.h"
+#include "cx18-streams.h"
+#include "cx18-fileops.h"
#include "cx18-alsa.h"
+extern int cx18_alsa_debug;
+
+#define dprintk(fmt, arg...) do { \
+ if (cx18_alsa_debug) \
+ printk(KERN_INFO "cx18-alsa %s: " fmt, \
+ __func__, ##arg); \
+ } while (0)
+
+/* Forward Declaration */
+void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data,
+ size_t num_bytes);
+
+static struct snd_pcm_hardware snd_cx18_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_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
+
+ .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 int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream)
{
struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
struct snd_card *sc = cxsc->sc;
struct cx18 *cx = to_cx18(v4l2_dev);
+ struct cx18_stream *s;
+ struct cx18_open_id *item;
+ int ret;
+
+ /* Instruct the cx18 to start sending packets */
+ s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
+
+ /* Allocate memory */
+ item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
+ if (NULL == item) {
+ CX18_DEBUG_WARN("nomem on v4l2 open\n");
+ return -ENOMEM;
+ }
+ item->cx = cx;
+ item->type = s->type;
+ item->open_id = cx->open_id++;
+
+ /* See if the stream is available */
+ if (cx18_claim_stream(item, item->type)) {
+ /* No, it's already in use */
+ return -EBUSY;
+ }
+
+ if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
+ test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
+ /* We're already streaming. No additional action required */
+ return 0;
+ }
+
+
+ runtime->hw = snd_cx18_hw_capture;
+ snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+ cxsc->capture_pcm_substream = substream;
+ runtime->private_data = cx;
+
+ cx->pcm_announce_callback = cx18_alsa_announce_pcm_data;
+
+ /* Not currently streaming, so start it up */
+ set_bit(CX18_F_S_STREAMING, &s->s_flags);
+ ret = cx18_start_v4l2_encode_stream(s);
+
return 0;
}
static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream)
{
+ unsigned long flags;
+ struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
+ struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
+ struct cx18 *cx = to_cx18(v4l2_dev);
+ struct cx18_stream *s;
+ int ret;
+
+ /* Instruct the cx18 to stop sending packets */
+ s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
+ ret = cx18_stop_v4l2_encode_stream(s, 0);
+ clear_bit(CX18_F_S_STREAMING, &s->s_flags);
+
+ cx18_release_stream(s);
+
+ cx->pcm_announce_callback = NULL;
+
+ spin_lock_irqsave(&cxsc->slock, flags);
+ if (substream->runtime->dma_area) {
+ dprintk("freeing pcm capture region\n");
+ vfree(substream->runtime->dma_area);
+ substream->runtime->dma_area = NULL;
+ }
+ spin_unlock_irqrestore(&cxsc->slock, flags);
+
return 0;
}
return snd_pcm_lib_ioctl(substream, cmd, arg);
}
+
+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_cx18_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
+ int ret;
+
+ dprintk("%s called\n", __func__);
+
+ ret = snd_pcm_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(params));
return 0;
}
static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream)
{
+ struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
+
+ cxsc->hwptr_done_capture = 0;
+ cxsc->capture_transfer_done = 0;
+
return 0;
}
static
snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream)
{
- return 0;
+ unsigned long flags;
+ snd_pcm_uframes_t hwptr_done;
+ struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream);
+
+ spin_lock_irqsave(&cxsc->slock, flags);
+ hwptr_done = cxsc->hwptr_done_capture;
+ spin_unlock_irqrestore(&cxsc->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 struct snd_pcm_ops snd_cx18_pcm_capture_ops = {
.prepare = snd_cx18_pcm_prepare,
.trigger = snd_cx18_pcm_trigger,
.pointer = snd_cx18_pcm_pointer,
+ .page = snd_pcm_get_vmalloc_page,
};
-int __init snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
+void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, 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("cx18 alsa announce ptr=%p data=%p num_bytes=%d\n", cxsc,
+ pcm_data, num_bytes);
+
+ substream = cxsc->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 = cxsc->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);
+
+ cxsc->hwptr_done_capture += length;
+ if (cxsc->hwptr_done_capture >=
+ runtime->buffer_size)
+ cxsc->hwptr_done_capture -=
+ runtime->buffer_size;
+
+ cxsc->capture_transfer_done += length;
+ if (cxsc->capture_transfer_done >=
+ runtime->period_size) {
+ cxsc->capture_transfer_done -=
+ runtime->period_size;
+ period_elapsed = 1;
+ }
+
+ snd_pcm_stream_unlock(substream);
+
+ if (period_elapsed)
+ snd_pcm_period_elapsed(substream);
+}
+
+int snd_cx18_pcm_create(struct snd_cx18_card *cxsc)
{
struct snd_pcm *sp;
struct snd_card *sc = cxsc->sc;
__func__, ret);
goto err_exit;
}
+
+ spin_lock_init(&cxsc->slock);
+
+ snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE, &snd_cx18_pcm_capture_ops);
+ sp->info_flags = 0;
+ sp->private_data = cxsc;
+ strcpy(sp->name, "Conexant cx23418 Capture");
+
return 0;
err_exit:
#include "cx18-mailbox.h"
#include "cx18-queue.h"
#include "cx18-streams.h"
+#include "cx18-alsa-pcm.h" /* FIXME make configurable */
static const char *rpu_str[] = { "APU", "CPU", "EPU", "HPU" };
}
}
+
+static void cx18_mdl_send_to_alsa(struct cx18 *cx, struct cx18_stream *s,
+ struct cx18_mdl *mdl)
+{
+ struct cx18_buffer *buf;
+
+ if (mdl->bytesused == 0)
+ return;
+
+ /* We ignore mdl and buf readpos accounting here - it doesn't matter */
+
+ /* The likely case */
+ if (list_is_singular(&mdl->buf_list)) {
+ buf = list_first_entry(&mdl->buf_list, struct cx18_buffer,
+ list);
+ if (buf->bytesused)
+ cx->pcm_announce_callback(cx->alsa, buf->buf,
+ buf->bytesused);
+ return;
+ }
+
+ list_for_each_entry(buf, &mdl->buf_list, list) {
+ if (buf->bytesused == 0)
+ break;
+ cx->pcm_announce_callback(cx->alsa, buf->buf, buf->bytesused);
+ }
+}
+
static void epu_dma_done(struct cx18 *cx, struct cx18_in_work_order *order)
{
u32 handle, mdl_ack_count, id;
CX18_DEBUG_HI_DMA("%s recv bytesused = %d\n",
s->name, mdl->bytesused);
- if (s->type != CX18_ENC_STREAM_TYPE_TS) {
+ if (s->type == CX18_ENC_STREAM_TYPE_TS) {
+ cx18_mdl_send_to_dvb(s, mdl);
+ cx18_enqueue(s, mdl, &s->q_free);
+ } else if (s->type == CX18_ENC_STREAM_TYPE_PCM) {
+ /* Pass the data to cx18-alsa */
+ if (cx->pcm_announce_callback != NULL) {
+ cx18_mdl_send_to_alsa(cx, s, mdl);
+ cx18_enqueue(s, mdl, &s->q_free);
+ } else {
+ cx18_enqueue(s, mdl, &s->q_full);
+ }
+ } else {
cx18_enqueue(s, mdl, &s->q_full);
if (s->type == CX18_ENC_STREAM_TYPE_IDX)
cx18_stream_rotate_idx_mdls(cx);
}
- else {
- cx18_mdl_send_to_dvb(s, mdl);
- cx18_enqueue(s, mdl, &s->q_free);
- }
}
/* Put as many MDLs as possible back into fw use */
cx18_stream_load_fw_queue(s);
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff