[Xen-devel] [PATCH 07/11] ALSA: vsnd: Initialize virtul sound card

[Oleksandr Andrushchenko <andr2000@xxxxxxxxx>]

From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

Initialize virtual sound card with streams according to the
Xen store configuration.
Add stubs for stream PCM operations.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
---
 sound/drivers/xen-front.c | 232 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 232 insertions(+)

diff --git a/sound/drivers/xen-front.c b/sound/drivers/xen-front.c
index f3e3f64f0aa6..9f31e6832086 100644
--- a/sound/drivers/xen-front.c
+++ b/sound/drivers/xen-front.c
@@ -134,6 +134,129 @@ struct xdrv_info {
        struct sdev_card_plat_data cfg_plat_data;
 };
 
+static struct sdev_pcm_stream_info *sdrv_stream_get(
+       struct snd_pcm_substream *substream)
+{
+       struct sdev_pcm_instance_info *pcm_instance =
+               snd_pcm_substream_chip(substream);
+       struct sdev_pcm_stream_info *stream;
+
+       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+               stream = &pcm_instance->streams_pb[substream->number];
+       else
+               stream = &pcm_instance->streams_cap[substream->number];
+       return stream;
+}
+
+static void sdrv_copy_pcm_hw(struct snd_pcm_hardware *dst,
+       struct snd_pcm_hardware *src,
+       struct snd_pcm_hardware *ref_pcm_hw)
+{
+       *dst = *ref_pcm_hw;
+
+       if (src->formats)
+               dst->formats = src->formats;
+       if (src->buffer_bytes_max)
+               dst->buffer_bytes_max =
+                       src->buffer_bytes_max;
+       if (src->period_bytes_min)
+               dst->period_bytes_min =
+                       src->period_bytes_min;
+       if (src->period_bytes_max)
+               dst->period_bytes_max =
+                       src->period_bytes_max;
+       if (src->periods_min)
+               dst->periods_min = src->periods_min;
+       if (src->periods_max)
+               dst->periods_max = src->periods_max;
+       if (src->rates)
+               dst->rates = src->rates;
+       if (src->rate_min)
+               dst->rate_min = src->rate_min;
+       if (src->rate_max)
+               dst->rate_max = src->rate_max;
+       if (src->channels_min)
+               dst->channels_min = src->channels_min;
+       if (src->channels_max)
+               dst->channels_max = src->channels_max;
+       if (src->buffer_bytes_max) {
+               dst->buffer_bytes_max = src->buffer_bytes_max;
+               dst->period_bytes_max = src->buffer_bytes_max /
+                       src->periods_max;
+               dst->periods_max = dst->buffer_bytes_max /
+                       dst->period_bytes_max;
+       }
+}
+
+static int sdrv_alsa_open(struct snd_pcm_substream *substream)
+{
+       return 0;
+}
+
+static int sdrv_alsa_close(struct snd_pcm_substream *substream)
+{
+       return 0;
+}
+
+static int sdrv_alsa_hw_params(struct snd_pcm_substream *substream,
+       struct snd_pcm_hw_params *params)
+{
+       return 0;
+}
+
+static int sdrv_alsa_hw_free(struct snd_pcm_substream *substream)
+{
+       return 0;
+}
+
+static int sdrv_alsa_prepare(struct snd_pcm_substream *substream)
+{
+       return 0;
+}
+
+static int sdrv_alsa_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+       return 0;
+}
+
+static inline snd_pcm_uframes_t sdrv_alsa_pointer(
+       struct snd_pcm_substream *substream)
+{
+       return 0;
+}
+
+static int sdrv_alsa_playback_copy_user(struct snd_pcm_substream *substream,
+               int channel, unsigned long pos, void __user *buf,
+               unsigned long bytes)
+{
+       return 0;
+}
+
+static int sdrv_alsa_playback_copy_kernel(struct snd_pcm_substream *substream,
+               int channel, unsigned long pos, void *buf, unsigned long bytes)
+{
+       return 0;
+}
+
+static int sdrv_alsa_capture_copy_user(struct snd_pcm_substream *substream,
+               int channel, unsigned long pos, void __user *buf,
+               unsigned long bytes)
+{
+       return 0;
+}
+
+static int sdrv_alsa_capture_copy_kernel(struct snd_pcm_substream *substream,
+               int channel, unsigned long pos, void *buf, unsigned long bytes)
+{
+       return 0;
+}
+
+static int sdrv_alsa_playback_fill_silence(struct snd_pcm_substream *substream,
+       int channel, unsigned long pos, unsigned long bytes)
+{
+       return 0;
+}
+
 #define MAX_XEN_BUFFER_SIZE    (64 * 1024)
 #define MAX_BUFFER_SIZE                MAX_XEN_BUFFER_SIZE
 #define MIN_PERIOD_SIZE                64
@@ -168,10 +291,119 @@ static struct snd_pcm_hardware sdrv_pcm_hw_default = {
        .fifo_size = 0,
 };
 
+/*
+ * FIXME: The mmaped data transfer is asynchronous and there is no
+ * ack signal from user-space when it is done. This is the
+ * reason it is not implemented in the PV driver as we do need
+ * to know when the buffer can be transferred to the backend.
+ */
+
+static struct snd_pcm_ops sdrv_alsa_playback_ops = {
+       .open = sdrv_alsa_open,
+       .close = sdrv_alsa_close,
+       .ioctl = snd_pcm_lib_ioctl,
+       .hw_params = sdrv_alsa_hw_params,
+       .hw_free = sdrv_alsa_hw_free,
+       .prepare = sdrv_alsa_prepare,
+       .trigger = sdrv_alsa_trigger,
+       .pointer = sdrv_alsa_pointer,
+       .copy_user = sdrv_alsa_playback_copy_user,
+       .copy_kernel = sdrv_alsa_playback_copy_kernel,
+       .fill_silence = sdrv_alsa_playback_fill_silence,
+};
+
+static struct snd_pcm_ops sdrv_alsa_capture_ops = {
+       .open = sdrv_alsa_open,
+       .close = sdrv_alsa_close,
+       .ioctl = snd_pcm_lib_ioctl,
+       .hw_params = sdrv_alsa_hw_params,
+       .hw_free = sdrv_alsa_hw_free,
+       .prepare = sdrv_alsa_prepare,
+       .trigger = sdrv_alsa_trigger,
+       .pointer = sdrv_alsa_pointer,
+       .copy_user = sdrv_alsa_capture_copy_user,
+       .copy_kernel = sdrv_alsa_capture_copy_kernel,
+};
+
 static int sdrv_new_pcm(struct sdev_card_info *card_info,
        struct cfg_pcm_instance *instance_config,
        struct sdev_pcm_instance_info *pcm_instance_info)
 {
+       struct snd_pcm *pcm;
+       int ret, i;
+
+       dev_dbg(&card_info->xdrv_info->xb_dev->dev,
+               "New PCM device \"%s\" with id %d playback %d capture %d",
+               instance_config->name,
+               instance_config->device_id,
+               instance_config->num_streams_pb,
+               instance_config->num_streams_cap);
+
+       pcm_instance_info->card_info = card_info;
+
+       sdrv_copy_pcm_hw(&pcm_instance_info->pcm_hw,
+               &instance_config->pcm_hw, &card_info->pcm_hw);
+
+       if (instance_config->num_streams_pb) {
+               pcm_instance_info->streams_pb = devm_kcalloc(
+                       &card_info->card->card_dev,
+                       instance_config->num_streams_pb,
+                       sizeof(struct sdev_pcm_stream_info),
+                       GFP_KERNEL);
+               if (!pcm_instance_info->streams_pb)
+                       return -ENOMEM;
+       }
+
+       if (instance_config->num_streams_cap) {
+               pcm_instance_info->streams_cap = devm_kcalloc(
+                       &card_info->card->card_dev,
+                       instance_config->num_streams_cap,
+                       sizeof(struct sdev_pcm_stream_info),
+                       GFP_KERNEL);
+               if (!pcm_instance_info->streams_cap)
+                       return -ENOMEM;
+       }
+
+       pcm_instance_info->num_pcm_streams_pb =
+                       instance_config->num_streams_pb;
+       pcm_instance_info->num_pcm_streams_cap =
+                       instance_config->num_streams_cap;
+
+       for (i = 0; i < pcm_instance_info->num_pcm_streams_pb; i++) {
+               pcm_instance_info->streams_pb[i].pcm_hw =
+                       instance_config->streams_pb[i].pcm_hw;
+               pcm_instance_info->streams_pb[i].unique_id =
+                       instance_config->streams_pb[i].unique_id;
+       }
+
+       for (i = 0; i < pcm_instance_info->num_pcm_streams_cap; i++) {
+               pcm_instance_info->streams_cap[i].pcm_hw =
+                       instance_config->streams_cap[i].pcm_hw;
+               pcm_instance_info->streams_cap[i].unique_id =
+                       instance_config->streams_cap[i].unique_id;
+       }
+
+       ret = snd_pcm_new(card_info->card, instance_config->name,
+                       instance_config->device_id,
+                       instance_config->num_streams_pb,
+                       instance_config->num_streams_cap,
+                       &pcm);
+       if (ret < 0)
+               return ret;
+
+       pcm->private_data = pcm_instance_info;
+       pcm->info_flags = 0;
+       strncpy(pcm->name, "Virtual card PCM", sizeof(pcm->name));
+
+       if (instance_config->num_streams_pb)
+               snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+                               &sdrv_alsa_playback_ops);
+
+       if (instance_config->num_streams_cap)
+               snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
+                               &sdrv_alsa_capture_ops);
+
+       pcm_instance_info->pcm = pcm;
        return 0;
 }
 
-- 
2.7.4


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