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[Xen-devel] [PATCH v2 2/5] ALSA: xen-front: Read sound driver configuration from Xen store



From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

Read configuration values from Xen store according
to xen/interface/io/sndif.h protocol:
  - introduce configuration structures for different
    components, e.g. sound card, device, stream
  - read PCM HW parameters, e.g rate, format etc.
  - detect stream type (capture/playback)
  - read device and card parameters

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
---
 sound/xen/Makefile            |   3 +-
 sound/xen/xen_snd_front.c     |   7 +
 sound/xen/xen_snd_front.h     |   4 +
 sound/xen/xen_snd_front_cfg.c | 517 ++++++++++++++++++++++++++++++++++++++++++
 sound/xen/xen_snd_front_cfg.h |  46 ++++
 5 files changed, 576 insertions(+), 1 deletion(-)
 create mode 100644 sound/xen/xen_snd_front_cfg.c
 create mode 100644 sound/xen/xen_snd_front_cfg.h

diff --git a/sound/xen/Makefile b/sound/xen/Makefile
index 4507ef3c27fd..06705bef61fa 100644
--- a/sound/xen/Makefile
+++ b/sound/xen/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0 OR MIT
 
-snd_xen_front-objs := xen_snd_front.o
+snd_xen_front-objs := xen_snd_front.o \
+                     xen_snd_front_cfg.o
 
 obj-$(CONFIG_SND_XEN_FRONTEND) += snd_xen_front.o
diff --git a/sound/xen/xen_snd_front.c b/sound/xen/xen_snd_front.c
index f406a8f52c51..65d2494a9d14 100644
--- a/sound/xen/xen_snd_front.c
+++ b/sound/xen/xen_snd_front.c
@@ -25,6 +25,13 @@ static void xen_snd_drv_fini(struct xen_snd_front_info 
*front_info)
 
 static int sndback_initwait(struct xen_snd_front_info *front_info)
 {
+       int num_streams;
+       int ret;
+
+       ret = xen_snd_front_cfg_card(front_info, &num_streams);
+       if (ret < 0)
+               return ret;
+
        return 0;
 }
 
diff --git a/sound/xen/xen_snd_front.h b/sound/xen/xen_snd_front.h
index 4ae204b23d32..b52226cb30bc 100644
--- a/sound/xen/xen_snd_front.h
+++ b/sound/xen/xen_snd_front.h
@@ -11,8 +11,12 @@
 #ifndef __XEN_SND_FRONT_H
 #define __XEN_SND_FRONT_H
 
+#include "xen_snd_front_cfg.h"
+
 struct xen_snd_front_info {
        struct xenbus_device *xb_dev;
+
+       struct xen_front_cfg_card cfg;
 };
 
 #endif /* __XEN_SND_FRONT_H */
diff --git a/sound/xen/xen_snd_front_cfg.c b/sound/xen/xen_snd_front_cfg.c
new file mode 100644
index 000000000000..d461985afffa
--- /dev/null
+++ b/sound/xen/xen_snd_front_cfg.c
@@ -0,0 +1,517 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+
+/*
+ * Xen para-virtual sound device
+ *
+ * Copyright (C) 2016-2018 EPAM Systems Inc.
+ *
+ * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
+ */
+
+#include <xen/xenbus.h>
+
+#include <xen/interface/io/sndif.h>
+
+#include "xen_snd_front.h"
+#include "xen_snd_front_cfg.h"
+
+/* maximum number of supported streams */
+#define VSND_MAX_STREAM                8
+
+struct cfg_hw_sample_rate {
+       const char *name;
+       unsigned int mask;
+       unsigned int value;
+};
+
+static const struct cfg_hw_sample_rate CFG_HW_SUPPORTED_RATES[] = {
+       { .name = "5512",   .mask = SNDRV_PCM_RATE_5512,   .value = 5512 },
+       { .name = "8000",   .mask = SNDRV_PCM_RATE_8000,   .value = 8000 },
+       { .name = "11025",  .mask = SNDRV_PCM_RATE_11025,  .value = 11025 },
+       { .name = "16000",  .mask = SNDRV_PCM_RATE_16000,  .value = 16000 },
+       { .name = "22050",  .mask = SNDRV_PCM_RATE_22050,  .value = 22050 },
+       { .name = "32000",  .mask = SNDRV_PCM_RATE_32000,  .value = 32000 },
+       { .name = "44100",  .mask = SNDRV_PCM_RATE_44100,  .value = 44100 },
+       { .name = "48000",  .mask = SNDRV_PCM_RATE_48000,  .value = 48000 },
+       { .name = "64000",  .mask = SNDRV_PCM_RATE_64000,  .value = 64000 },
+       { .name = "96000",  .mask = SNDRV_PCM_RATE_96000,  .value = 96000 },
+       { .name = "176400", .mask = SNDRV_PCM_RATE_176400, .value = 176400 },
+       { .name = "192000", .mask = SNDRV_PCM_RATE_192000, .value = 192000 },
+};
+
+struct cfg_hw_sample_format {
+       const char *name;
+       u64 mask;
+};
+
+static const struct cfg_hw_sample_format CFG_HW_SUPPORTED_FORMATS[] = {
+       {
+               .name = XENSND_PCM_FORMAT_U8_STR,
+               .mask = SNDRV_PCM_FMTBIT_U8
+       },
+       {
+               .name = XENSND_PCM_FORMAT_S8_STR,
+               .mask = SNDRV_PCM_FMTBIT_S8
+       },
+       {
+               .name = XENSND_PCM_FORMAT_U16_LE_STR,
+               .mask = SNDRV_PCM_FMTBIT_U16_LE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_U16_BE_STR,
+               .mask = SNDRV_PCM_FMTBIT_U16_BE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_S16_LE_STR,
+               .mask = SNDRV_PCM_FMTBIT_S16_LE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_S16_BE_STR,
+               .mask = SNDRV_PCM_FMTBIT_S16_BE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_U24_LE_STR,
+               .mask = SNDRV_PCM_FMTBIT_U24_LE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_U24_BE_STR,
+               .mask = SNDRV_PCM_FMTBIT_U24_BE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_S24_LE_STR,
+               .mask = SNDRV_PCM_FMTBIT_S24_LE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_S24_BE_STR,
+               .mask = SNDRV_PCM_FMTBIT_S24_BE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_U32_LE_STR,
+               .mask = SNDRV_PCM_FMTBIT_U32_LE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_U32_BE_STR,
+               .mask = SNDRV_PCM_FMTBIT_U32_BE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_S32_LE_STR,
+               .mask = SNDRV_PCM_FMTBIT_S32_LE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_S32_BE_STR,
+               .mask = SNDRV_PCM_FMTBIT_S32_BE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_A_LAW_STR,
+               .mask = SNDRV_PCM_FMTBIT_A_LAW
+       },
+       {
+               .name = XENSND_PCM_FORMAT_MU_LAW_STR,
+               .mask = SNDRV_PCM_FMTBIT_MU_LAW
+       },
+       {
+               .name = XENSND_PCM_FORMAT_F32_LE_STR,
+               .mask = SNDRV_PCM_FMTBIT_FLOAT_LE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_F32_BE_STR,
+               .mask = SNDRV_PCM_FMTBIT_FLOAT_BE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_F64_LE_STR,
+               .mask = SNDRV_PCM_FMTBIT_FLOAT64_LE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_F64_BE_STR,
+               .mask = SNDRV_PCM_FMTBIT_FLOAT64_BE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE_STR,
+               .mask = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE_STR,
+               .mask = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
+       },
+       {
+               .name = XENSND_PCM_FORMAT_IMA_ADPCM_STR,
+               .mask = SNDRV_PCM_FMTBIT_IMA_ADPCM
+       },
+       {
+               .name = XENSND_PCM_FORMAT_MPEG_STR,
+               .mask = SNDRV_PCM_FMTBIT_MPEG
+       },
+       {
+               .name = XENSND_PCM_FORMAT_GSM_STR,
+               .mask = SNDRV_PCM_FMTBIT_GSM
+       },
+};
+
+static void cfg_hw_rates(char *list, unsigned int len,
+                        const char *path, struct snd_pcm_hardware *pcm_hw)
+{
+       char *cur_rate;
+       unsigned int cur_mask;
+       unsigned int cur_value;
+       unsigned int rates;
+       unsigned int rate_min;
+       unsigned int rate_max;
+       int i;
+
+       rates = 0;
+       rate_min = -1;
+       rate_max = 0;
+       while ((cur_rate = strsep(&list, XENSND_LIST_SEPARATOR))) {
+               for (i = 0; i < ARRAY_SIZE(CFG_HW_SUPPORTED_RATES); i++)
+                       if (!strncasecmp(cur_rate,
+                                        CFG_HW_SUPPORTED_RATES[i].name,
+                                        XENSND_SAMPLE_RATE_MAX_LEN)) {
+                               cur_mask = CFG_HW_SUPPORTED_RATES[i].mask;
+                               cur_value = CFG_HW_SUPPORTED_RATES[i].value;
+                               rates |= cur_mask;
+                               if (rate_min > cur_value)
+                                       rate_min = cur_value;
+                               if (rate_max < cur_value)
+                                       rate_max = cur_value;
+                       }
+       }
+
+       if (rates) {
+               pcm_hw->rates = rates;
+               pcm_hw->rate_min = rate_min;
+               pcm_hw->rate_max = rate_max;
+       }
+}
+
+static void cfg_formats(char *list, unsigned int len,
+                       const char *path, struct snd_pcm_hardware *pcm_hw)
+{
+       u64 formats;
+       char *cur_format;
+       int i;
+
+       formats = 0;
+       while ((cur_format = strsep(&list, XENSND_LIST_SEPARATOR))) {
+               for (i = 0; i < ARRAY_SIZE(CFG_HW_SUPPORTED_FORMATS); i++)
+                       if (!strncasecmp(cur_format,
+                                        CFG_HW_SUPPORTED_FORMATS[i].name,
+                                        XENSND_SAMPLE_FORMAT_MAX_LEN))
+                               formats |= CFG_HW_SUPPORTED_FORMATS[i].mask;
+       }
+
+       if (formats)
+               pcm_hw->formats = formats;
+}
+
+#define MAX_BUFFER_SIZE                (64 * 1024)
+#define MIN_PERIOD_SIZE                64
+#define MAX_PERIOD_SIZE                MAX_BUFFER_SIZE
+#define USE_FORMATS            (SNDRV_PCM_FMTBIT_U8 | \
+                                SNDRV_PCM_FMTBIT_S16_LE)
+#define USE_RATE               (SNDRV_PCM_RATE_CONTINUOUS | \
+                                SNDRV_PCM_RATE_8000_48000)
+#define USE_RATE_MIN           5512
+#define USE_RATE_MAX           48000
+#define USE_CHANNELS_MIN       1
+#define USE_CHANNELS_MAX       2
+#define USE_PERIODS_MIN                2
+#define USE_PERIODS_MAX                (MAX_BUFFER_SIZE / MIN_PERIOD_SIZE)
+
+static const struct snd_pcm_hardware SND_DRV_PCM_HW_DEFAULT = {
+       .info = (SNDRV_PCM_INFO_MMAP |
+                SNDRV_PCM_INFO_INTERLEAVED |
+                SNDRV_PCM_INFO_RESUME |
+                SNDRV_PCM_INFO_MMAP_VALID),
+       .formats = USE_FORMATS,
+       .rates = USE_RATE,
+       .rate_min = USE_RATE_MIN,
+       .rate_max = USE_RATE_MAX,
+       .channels_min = USE_CHANNELS_MIN,
+       .channels_max = USE_CHANNELS_MAX,
+       .buffer_bytes_max = MAX_BUFFER_SIZE,
+       .period_bytes_min = MIN_PERIOD_SIZE,
+       .period_bytes_max = MAX_PERIOD_SIZE,
+       .periods_min = USE_PERIODS_MIN,
+       .periods_max = USE_PERIODS_MAX,
+       .fifo_size = 0,
+};
+
+static void cfg_read_pcm_hw(const char *path,
+                           struct snd_pcm_hardware *parent_pcm_hw,
+                           struct snd_pcm_hardware *pcm_hw)
+{
+       char *list;
+       int val;
+       size_t buf_sz;
+       unsigned int len;
+
+       /* inherit parent's PCM HW and read overrides from XenStore */
+       if (parent_pcm_hw)
+               *pcm_hw = *parent_pcm_hw;
+       else
+               *pcm_hw = SND_DRV_PCM_HW_DEFAULT;
+
+       val = xenbus_read_unsigned(path, XENSND_FIELD_CHANNELS_MIN, 0);
+       if (val)
+               pcm_hw->channels_min = val;
+
+       val = xenbus_read_unsigned(path, XENSND_FIELD_CHANNELS_MAX, 0);
+       if (val)
+               pcm_hw->channels_max = val;
+
+       list = xenbus_read(XBT_NIL, path, XENSND_FIELD_SAMPLE_RATES, &len);
+       if (!IS_ERR(list)) {
+               cfg_hw_rates(list, len, path, pcm_hw);
+               kfree(list);
+       }
+
+       list = xenbus_read(XBT_NIL, path, XENSND_FIELD_SAMPLE_FORMATS, &len);
+       if (!IS_ERR(list)) {
+               cfg_formats(list, len, path, pcm_hw);
+               kfree(list);
+       }
+
+       buf_sz = xenbus_read_unsigned(path, XENSND_FIELD_BUFFER_SIZE, 0);
+       if (buf_sz)
+               pcm_hw->buffer_bytes_max = buf_sz;
+
+       /* update configuration to match new values */
+       if (pcm_hw->channels_min > pcm_hw->channels_max)
+               pcm_hw->channels_min = pcm_hw->channels_max;
+
+       if (pcm_hw->rate_min > pcm_hw->rate_max)
+               pcm_hw->rate_min = pcm_hw->rate_max;
+
+       pcm_hw->period_bytes_max = pcm_hw->buffer_bytes_max;
+
+       pcm_hw->periods_max = pcm_hw->period_bytes_max /
+               pcm_hw->period_bytes_min;
+}
+
+static int cfg_get_stream_type(const char *path, int index,
+                              int *num_pb, int *num_cap)
+{
+       char *str = NULL;
+       char *stream_path;
+       int ret;
+
+       *num_pb = 0;
+       *num_cap = 0;
+       stream_path = kasprintf(GFP_KERNEL, "%s/%d", path, index);
+       if (!stream_path) {
+               ret = -ENOMEM;
+               goto fail;
+       }
+
+       str = xenbus_read(XBT_NIL, stream_path, XENSND_FIELD_TYPE, NULL);
+       if (IS_ERR(str)) {
+               ret = -EINVAL;
+               goto fail;
+       }
+
+       if (!strncasecmp(str, XENSND_STREAM_TYPE_PLAYBACK,
+                        sizeof(XENSND_STREAM_TYPE_PLAYBACK))) {
+               (*num_pb)++;
+       } else if (!strncasecmp(str, XENSND_STREAM_TYPE_CAPTURE,
+                             sizeof(XENSND_STREAM_TYPE_CAPTURE))) {
+               (*num_cap)++;
+       } else {
+               ret = -EINVAL;
+               goto fail;
+       }
+       ret = 0;
+
+fail:
+       kfree(stream_path);
+       kfree(str);
+       return ret;
+}
+
+static int cfg_stream(struct xen_snd_front_info *front_info,
+                     struct xen_front_cfg_pcm_instance *pcm_instance,
+                     const char *path, int index, int *cur_pb, int *cur_cap,
+                     int *stream_cnt)
+{
+       char *str = NULL;
+       char *stream_path;
+       struct xen_front_cfg_stream *stream;
+       int ret;
+
+       stream_path = devm_kasprintf(&front_info->xb_dev->dev,
+                                    GFP_KERNEL, "%s/%d", path, index);
+       if (!stream_path) {
+               ret = -ENOMEM;
+               goto fail;
+       }
+
+       str = xenbus_read(XBT_NIL, stream_path, XENSND_FIELD_TYPE, NULL);
+       if (IS_ERR(str)) {
+               ret = -EINVAL;
+               goto fail;
+       }
+
+       if (!strncasecmp(str, XENSND_STREAM_TYPE_PLAYBACK,
+                        sizeof(XENSND_STREAM_TYPE_PLAYBACK))) {
+               stream = &pcm_instance->streams_pb[(*cur_pb)++];
+       } else if (!strncasecmp(str, XENSND_STREAM_TYPE_CAPTURE,
+                             sizeof(XENSND_STREAM_TYPE_CAPTURE))) {
+               stream = &pcm_instance->streams_cap[(*cur_cap)++];
+       } else {
+               ret = -EINVAL;
+               goto fail;
+       }
+
+       /* get next stream index */
+       stream->index = (*stream_cnt)++;
+       stream->xenstore_path = stream_path;
+       /*
+        * check in Xen store if PCM HW configuration exists for this stream
+        * and update if so, e.g. we inherit all values from device's PCM HW,
+        * but can still override some of the values for the stream
+        */
+       cfg_read_pcm_hw(stream->xenstore_path,
+                       &pcm_instance->pcm_hw, &stream->pcm_hw);
+       ret = 0;
+
+fail:
+       kfree(str);
+       return ret;
+}
+
+static int cfg_device(struct xen_snd_front_info *front_info,
+                     struct xen_front_cfg_pcm_instance *pcm_instance,
+                     struct snd_pcm_hardware *parent_pcm_hw,
+                     const char *path, int node_index, int *stream_cnt)
+{
+       char *str;
+       char *device_path;
+       int ret, i, num_streams;
+       int num_pb, num_cap;
+       int cur_pb, cur_cap;
+       char node[3];
+
+       device_path = kasprintf(GFP_KERNEL, "%s/%d", path, node_index);
+       if (!device_path)
+               return -ENOMEM;
+
+       str = xenbus_read(XBT_NIL, device_path, XENSND_FIELD_DEVICE_NAME, NULL);
+       if (!IS_ERR(str)) {
+               strncpy(pcm_instance->name, str, sizeof(pcm_instance->name));
+               kfree(str);
+       }
+
+       pcm_instance->device_id = node_index;
+
+       /*
+        * check in Xen store if PCM HW configuration exists for this device
+        * and update if so, e.g. we inherit all values from card's PCM HW,
+        * but can still override some of the values for the device
+        */
+       cfg_read_pcm_hw(device_path, parent_pcm_hw, &pcm_instance->pcm_hw);
+
+       /* find out how many streams were configured in Xen store */
+       num_streams = 0;
+       do {
+               snprintf(node, sizeof(node), "%d", num_streams);
+               if (!xenbus_exists(XBT_NIL, device_path, node))
+                       break;
+
+               num_streams++;
+       } while (num_streams < VSND_MAX_STREAM);
+
+       pcm_instance->num_streams_pb = 0;
+       pcm_instance->num_streams_cap = 0;
+       /* get number of playback and capture streams */
+       for (i = 0; i < num_streams; i++) {
+               ret = cfg_get_stream_type(device_path, i, &num_pb, &num_cap);
+               if (ret < 0)
+                       goto fail;
+
+               pcm_instance->num_streams_pb += num_pb;
+               pcm_instance->num_streams_cap += num_cap;
+       }
+
+       if (pcm_instance->num_streams_pb) {
+               pcm_instance->streams_pb =
+                               devm_kcalloc(&front_info->xb_dev->dev,
+                                            pcm_instance->num_streams_pb,
+                                            sizeof(struct 
xen_front_cfg_stream),
+                                            GFP_KERNEL);
+               if (!pcm_instance->streams_pb) {
+                       ret = -ENOMEM;
+                       goto fail;
+               }
+       }
+
+       if (pcm_instance->num_streams_cap) {
+               pcm_instance->streams_cap =
+                               devm_kcalloc(&front_info->xb_dev->dev,
+                                            pcm_instance->num_streams_cap,
+                                            sizeof(struct 
xen_front_cfg_stream),
+                                            GFP_KERNEL);
+               if (!pcm_instance->streams_cap) {
+                       ret = -ENOMEM;
+                       goto fail;
+               }
+       }
+
+       cur_pb = 0;
+       cur_cap = 0;
+       for (i = 0; i < num_streams; i++) {
+               ret = cfg_stream(front_info, pcm_instance, device_path, i,
+                                &cur_pb, &cur_cap, stream_cnt);
+               if (ret < 0)
+                       goto fail;
+       }
+       ret = 0;
+
+fail:
+       kfree(device_path);
+       return ret;
+}
+
+int xen_snd_front_cfg_card(struct xen_snd_front_info *front_info,
+                          int *stream_cnt)
+{
+       struct xenbus_device *xb_dev = front_info->xb_dev;
+       struct xen_front_cfg_card *cfg = &front_info->cfg;
+       int ret, num_devices, i;
+       char node[3];
+
+       *stream_cnt = 0;
+       num_devices = 0;
+       do {
+               snprintf(node, sizeof(node), "%d", num_devices);
+               if (!xenbus_exists(XBT_NIL, xb_dev->nodename, node))
+                       break;
+
+               num_devices++;
+       } while (num_devices < SNDRV_PCM_DEVICES);
+
+       if (!num_devices) {
+               dev_warn(&xb_dev->dev,
+                        "No devices configured for sound card at %s\n",
+                        xb_dev->nodename);
+               return -ENODEV;
+       }
+
+       /* start from default PCM HW configuration for the card */
+       cfg_read_pcm_hw(xb_dev->nodename, NULL, &cfg->pcm_hw);
+
+       cfg->pcm_instances =
+                       devm_kcalloc(&front_info->xb_dev->dev, num_devices,
+                                    sizeof(struct xen_front_cfg_pcm_instance),
+                                    GFP_KERNEL);
+       if (!cfg->pcm_instances)
+               return -ENOMEM;
+
+       for (i = 0; i < num_devices; i++) {
+               ret = cfg_device(front_info, &cfg->pcm_instances[i],
+                                &cfg->pcm_hw, xb_dev->nodename, i, stream_cnt);
+               if (ret < 0)
+                       return ret;
+       }
+       cfg->num_pcm_instances = num_devices;
+       return 0;
+}
+
diff --git a/sound/xen/xen_snd_front_cfg.h b/sound/xen/xen_snd_front_cfg.h
new file mode 100644
index 000000000000..2353fcc74889
--- /dev/null
+++ b/sound/xen/xen_snd_front_cfg.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+
+/*
+ * Xen para-virtual sound device
+ *
+ * Copyright (C) 2016-2018 EPAM Systems Inc.
+ *
+ * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
+ */
+
+#ifndef __XEN_SND_FRONT_CFG_H
+#define __XEN_SND_FRONT_CFG_H
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+
+struct xen_snd_front_info;
+
+struct xen_front_cfg_stream {
+       int index;
+       char *xenstore_path;
+       struct snd_pcm_hardware pcm_hw;
+};
+
+struct xen_front_cfg_pcm_instance {
+       char name[80];
+       int device_id;
+       struct snd_pcm_hardware pcm_hw;
+       int  num_streams_pb;
+       struct xen_front_cfg_stream *streams_pb;
+       int  num_streams_cap;
+       struct xen_front_cfg_stream *streams_cap;
+};
+
+struct xen_front_cfg_card {
+       char name_short[32];
+       char name_long[80];
+       struct snd_pcm_hardware pcm_hw;
+       int num_pcm_instances;
+       struct xen_front_cfg_pcm_instance *pcm_instances;
+};
+
+int xen_snd_front_cfg_card(struct xen_snd_front_info *front_info,
+                          int *stream_cnt);
+
+#endif /* __XEN_SND_FRONT_CFG_H */
-- 
2.16.2


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