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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 1/2] xen-sndfront: add sound frontend driver
This is Para-virtual sound driver.
Frontend driver registers an virtual sound card
and sends an PCM streams to the backend driver.
Backend driver is an user-space application and
uses ALSA with dmix plugin to play audio.
Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>
Signed-off-by: Iurii Konovalenko <iurii.konovalenko@xxxxxxxxxxxxxxx>
---
include/xen/interface/io/sndif.h | 208 ++++++
sound/drivers/Kconfig | 10 +
sound/drivers/Makefile | 2 +
sound/drivers/xen-sndfront.c | 1478 ++++++++++++++++++++++++++++++++++++++
4 files changed, 1698 insertions(+)
create mode 100644 include/xen/interface/io/sndif.h
create mode 100644 sound/drivers/xen-sndfront.c
diff --git a/include/xen/interface/io/sndif.h b/include/xen/interface/io/sndif.h
new file mode 100644
index 0000000..38a5f1e
--- /dev/null
+++ b/include/xen/interface/io/sndif.h
@@ -0,0 +1,208 @@
+/******************************************************************************
+ * sndif.h
+ *
+ * Unified sound-device I/O interface for Xen guest OSes.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Copyright (C) 2013-2015 GlobalLogic Inc.
+ */
+
+#ifndef __XEN_PUBLIC_IO_SNDIF_H__
+#define __XEN_PUBLIC_IO_SNDIF_H__
+
+#include <xen/interface/io/ring.h>
+#include <xen/interface/grant_table.h>
+
+/*
+ * Feature and Parameter Negotiation
+ * =================================
+ * The two halves of a Xen vsnd driver utilize nodes within the XenStore to
+ * communicate capabilities and to negotiate operating parameters. This
+ * section enumerates these nodes which reside in the respective front and
+ * backend portions of the XenStore, following the XenBus convention.
+ *
+ * All data in the XenStore is stored as strings. Nodes specifying numeric
+ * values are encoded in decimal. Integer value ranges listed below are
+ * expressed as fixed sized integer types capable of storing the conversion
+ * of a properly formated node string, without loss of information.
+ *
+ * Any specified default value is in effect if the corresponding XenBus node
+ * is not present in the XenStore.
+ *
+ * XenStore nodes in sections marked "PRIVATE" are solely for use by the
+ * driver side whose XenBus tree contains them.
+ *
+ *****************************************************************************
+ * Backend XenBus Nodes
+ *****************************************************************************
+ *
+ *------------------ Backend Device Identification (PRIVATE) ------------------
+ *
+ * stream_id
+ * Values: <uint32_t>
+ *
+ * Virtuelized stream number
+ *
+ *****************************************************************************
+ * Frontend XenBus Nodes
+ *****************************************************************************
+ *
+ *----------------------- Request Transport Parameters -----------------------
+ *
+ * event-channel
+ * Values: <uint32_t>
+ *
+ * The identifier of the Xen event channel used to signal activity
+ * in the ring buffer.
+ *
+ * ring-ref
+ * Values: <uint32_t>
+ * Notes: 6
+ *
+ * The Xen grant reference granting permission for the backend to map
+ * the sole page in a single page sized ring buffer.
+ */
+
+/*
+ * PCM FORMATS.
+ */
+#define SNDIF_PCM_FORMAT_S8 (0)
+#define SNDIF_PCM_FORMAT_U8 (1)
+#define SNDIF_PCM_FORMAT_S16_LE (2)
+#define SNDIF_PCM_FORMAT_S16_BE (3)
+#define SNDIF_PCM_FORMAT_U16_LE (4)
+#define SNDIF_PCM_FORMAT_U16_BE (5)
+
+/* low three bytes */
+#define SNDIF_PCM_FORMAT_S24_LE (6)
+
+/* low three bytes */
+#define SNDIF_PCM_FORMAT_S24_BE (7)
+
+/* low three bytes */
+#define SNDIF_PCM_FORMAT_U24_LE (8)
+
+/* low three bytes */
+#define SNDIF_PCM_FORMAT_U24_BE (9)
+
+#define SNDIF_PCM_FORMAT_S32_LE (10)
+#define SNDIF_PCM_FORMAT_S32_BE (11)
+#define SNDIF_PCM_FORMAT_U32_LE (12)
+#define SNDIF_PCM_FORMAT_U32_BE (13)
+
+/* 4-byte float, IEEE-754 32-bit, range -1.0 to 1.0 */
+#define SNDIF_PCM_FORMAT_FLOAT_LE (14)
+
+/* 4-byte float, IEEE-754 32-bit, range -1.0 to 1.0 */
+#define SNDIF_PCM_FORMAT_FLOAT_BE (15)
+
+/* 8-byte float, IEEE-754 64-bit, range -1.0 to 1.0 */
+#define SNDIF_PCM_FORMAT_FLOAT64_LE (16)
+
+/* 8-byte float, IEEE-754 64-bit, range -1.0 to 1.0 */
+#define SNDIF_PCM_FORMAT_FLOAT64_BE (17)
+
+/* IEC-958 subframe, Little Endian */
+#define SNDIF_PCM_FORMAT_IEC958_SUBFRAME_LE (18)
+
+/* IEC-958 subframe, Big Endian */
+#define SNDIF_PCM_FORMAT_IEC958_SUBFRAME_BE (19)
+
+#define SNDIF_PCM_FORMAT_MU_LAW (20)
+#define SNDIF_PCM_FORMAT_A_LAW (21)
+#define SNDIF_PCM_FORMAT_IMA_ADPCM (22)
+#define SNDIF_PCM_FORMAT_MPEG (23)
+#define SNDIF_PCM_FORMAT_GSM (24)
+#define SNDIF_PCM_FORMAT_SPECIAL (31)
+
+/*
+ * REQUEST CODES.
+ */
+#define SNDIF_OP_OPEN 0
+#define SNDIF_OP_CLOSE 1
+#define SNDIF_OP_READ 2
+#define SNDIF_OP_WRITE 3
+#define SNDIF_SET_VOLUME 4
+#define SNDIF_GET_VOLUME 5
+
+#define SNDIF_MAX_PAGES_PER_REQUEST 10
+
+/*
+ * STATUS RETURN CODES.
+ */
+ /* Operation failed for some unspecified reason (-EIO). */
+#define SNDIF_RSP_ERROR -1
+ /* Operation completed successfully. */
+#define SNDIF_RSP_OKAY 0
+
+struct snd_params {
+ uint32_t format; /* SNDIF_PCM_FORMAT_??? */
+ uint32_t channels; /* Channels count */
+ uint32_t rate; /* Data rate */
+};
+
+struct sndif_request_common {
+ uint64_t id; /* private guest value, echoed in resp */
+ struct snd_params _pad1;
+ uint32_t _pad2;
+ uint32_t _pad3;
+} __attribute__((__packed__));
+
+struct sndif_request_open {
+ uint64_t id; /* private guest value, echoed in resp */
+ struct snd_params snd_params;
+ uint32_t stream;
+ uint32_t _pad2;
+} __attribute__((__packed__));
+
+struct sndif_request_rw {
+ uint64_t id; /* private guest value, echoed in resp */
+ struct snd_params _pad1;
+ uint32_t len;
+ uint32_t _pad2;
+ grant_ref_t gref[SNDIF_MAX_PAGES_PER_REQUEST];
+} __attribute__((__packed__));
+
+struct sndif_request_volume {
+ uint64_t id; /* private guest value, echoed in resp */
+ struct snd_params _pad1;
+ uint32_t left;
+ uint32_t right;
+} __attribute__((__packed__));
+
+struct sndif_request {
+ uint8_t operation; /* SNDIF_OP_??? */
+ union {
+ struct sndif_request_common common;
+ struct sndif_request_open open;
+ struct sndif_request_rw rw;
+ struct sndif_request_volume vol;
+ } u;
+} __attribute__((__packed__));
+
+struct sndif_response {
+ uint64_t id; /* copied from request */
+ uint8_t operation; /* copied from request */
+ int16_t status; /* SNDIF_RSP_??? */
+};
+
+DEFINE_RING_TYPES(sndif, struct sndif_request, struct sndif_response);
+
+#endif /* __XEN_PUBLIC_IO_SNDIF_H__ */
diff --git a/sound/drivers/Kconfig b/sound/drivers/Kconfig
index 8545da9..cd3db5a 100644
--- a/sound/drivers/Kconfig
+++ b/sound/drivers/Kconfig
@@ -24,6 +24,16 @@ config SND_AC97_CODEC
select AC97_BUS
select SND_VMASTER
+config XEN_SND_FRONTEND
+ tristate "Xen virtual audio front-end driver support"
+ depends on SND && XEN_DOMU
+ default n
+ select SND_PCM
+ help
+ This driver implements the front-end of the Xen virtual
+ audio driver. It communicates with a back-end
+ in another domain.
+
menuconfig SND_DRIVERS
bool "Generic sound devices"
default y
diff --git a/sound/drivers/Makefile b/sound/drivers/Makefile
index 1a8440c..f9f7e19 100644
--- a/sound/drivers/Makefile
+++ b/sound/drivers/Makefile
@@ -11,6 +11,7 @@ snd-portman2x4-objs := portman2x4.o
snd-serial-u16550-objs := serial-u16550.o
snd-virmidi-objs := virmidi.o
snd-ml403-ac97cr-objs := ml403-ac97cr.o pcm-indirect2.o
+xen-sndfrontend-objs := xen-sndfront.o
# Toplevel Module Dependency
obj-$(CONFIG_SND_DUMMY) += snd-dummy.o
@@ -21,5 +22,6 @@ obj-$(CONFIG_SND_MTPAV) += snd-mtpav.o
obj-$(CONFIG_SND_MTS64) += snd-mts64.o
obj-$(CONFIG_SND_PORTMAN2X4) += snd-portman2x4.o
obj-$(CONFIG_SND_ML403_AC97CR) += snd-ml403-ac97cr.o
+obj-$(CONFIG_XEN_SND_FRONTEND) += xen-sndfrontend.o
obj-$(CONFIG_SND) += opl3/ opl4/ mpu401/ vx/ pcsp/
diff --git a/sound/drivers/xen-sndfront.c b/sound/drivers/xen-sndfront.c
new file mode 100644
index 0000000..d0367c2
--- /dev/null
+++ b/sound/drivers/xen-sndfront.c
@@ -0,0 +1,1478 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Copyright (C) 2013-2015 GlobalLogic Inc.
+ */
+
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/jiffies.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/wait.h>
+#include <linux/hrtimer.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/tlv.h>
+#include <sound/pcm.h>
+#include <sound/rawmidi.h>
+#include <sound/info.h>
+#include <sound/initval.h>
+
+#include <linux/uaccess.h>
+
+#include <xen/xen.h>
+#include <xen/events.h>
+#include <xen/page.h>
+#include <xen/grant_table.h>
+#include <xen/xenbus.h>
+#include <xen/interface/grant_table.h>
+
+#include <xen/interface/io/protocols.h>
+#include <xen/interface/io/sndif.h>
+
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{ALSA,Virtual soundcard}}");
+
+#define VSND_WAIT_ANSWER_TOUT 5000
+
+#define MAX_PCM_DEVICES 1
+#define MAX_PCM_SUBSTREAMS 1
+#define MAX_BUFFER_SIZE (64*1024)
+
+/* defaults */
+#define MIN_PERIOD_SIZE 64
+#define MAX_PERIOD_SIZE (4*1024)
+#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 5500
+#define USE_RATE_MAX 48000
+#define USE_CHANNELS_MIN 1
+#define USE_CHANNELS_MAX 2
+#define USE_PERIODS_MIN 1
+#define USE_PERIODS_MAX 1024
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
+static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
+static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL};
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for virtual soundcard.");
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string for virtual soundcard.");
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable this virtual soundcard.");
+module_param_array(model, charp, NULL, 0444);
+MODULE_PARM_DESC(model, "Soundcard model.");
+
+#define MIXER_ADDR_MASTER_IN 0
+#define MIXER_ADDR_MASTER_OUT 1
+#define MIXER_ADDR_LAST MIXER_ADDR_MASTER_OUT
+
+struct vsnd_card {
+ struct sndfront_info *fr_info;
+ unsigned int stream_id;
+ grant_ref_t grefs[SNDIF_MAX_PAGES_PER_REQUEST];
+ unsigned char *buf;
+};
+
+#define SND_RING_SIZE __CONST_RING_SIZE(sndif, PAGE_SIZE)
+
+enum sndif_state {
+ SNDIF_STATE_DISCONNECTED,
+ SNDIF_STATE_CONNECTED,
+ SNDIF_STATE_SUSPENDED,
+};
+
+struct sndfront_info {
+ struct mutex mutex; /* protect sndfront closing state */
+ struct completion completion;
+ spinlock_t io_lock; /* protect 'connected' member */
+ struct xenbus_device *xbdev;
+ enum sndif_state connected;
+ int ring_ref;
+ struct sndif_front_ring ring;
+ unsigned int evtchn, irq;
+ struct vsnd_card *vcard;
+ int bret_code;
+ struct platform_device *card_dev;
+};
+
+#define GRANT_INVALID_REF 0
+
+struct virtualcard_model {
+ const char *name;
+ u64 formats;
+ size_t buffer_bytes_max;
+ size_t period_bytes_min;
+ size_t period_bytes_max;
+ unsigned int periods_min;
+ unsigned int periods_max;
+ unsigned int rates;
+ unsigned int rate_min;
+ unsigned int rate_max;
+ unsigned int channels_min;
+ unsigned int channels_max;
+};
+
+struct stream_info {
+ snd_pcm_uframes_t position; /* Current position */
+ snd_pcm_uframes_t crossed; /* Number of crossed writes*/
+ snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
+ unsigned int rate; /* rate in Hz */
+ unsigned int channels; /* channels */
+ bool opened; /* opened status */
+};
+
+struct snd_virtualcard {
+ struct snd_card *card;
+ struct virtualcard_model *model;
+ struct snd_pcm *pcm;
+ struct snd_pcm_hardware pcm_hw;
+ spinlock_t mixer_lock; /* protect mixer settings */
+ int mixer_volume[MIXER_ADDR_LAST+1][2];
+ int capture_source[MIXER_ADDR_LAST+1][2];
+ struct sndfront_info *fr_info;
+ struct stream_info streams[2];
+};
+
+/*
+ * card models
+ */
+
+struct virtualcard_model model_ac97 = {
+ .name = "ac97",
+ .formats = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE),
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .rate_min = 8000,
+ .rate_max = 48000,
+};
+
+struct virtualcard_model *virtualcard_models[] = {
+ &model_ac97,
+ NULL
+};
+
+/*
+ * PCM interface
+ */
+
+static struct snd_pcm_hardware virtualcard_pcm_hardware = {
+ .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 inline
+struct stream_info *get_vcard_stream(struct snd_virtualcard *virtualcard,
+ struct snd_pcm_substream *substream)
+{
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ return &virtualcard->streams[0];
+ else
+ return &virtualcard->streams[1];
+}
+
+static unsigned long vmalloc_to_mfn(void *address)
+{
+ return pfn_to_mfn(vmalloc_to_pfn(address));
+}
+
+static inline void flush_requests(struct sndfront_info *info)
+{
+ int notify;
+
+ RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&info->ring, notify);
+
+ if (notify)
+ notify_remote_via_irq(info->irq);
+}
+
+static int sndif_queue_request_open(struct sndfront_info *info,
+ snd_pcm_format_t format,
+ unsigned int channels,
+ unsigned int rate)
+{
+ struct sndif_request *req;
+
+ if (unlikely(info->connected != SNDIF_STATE_CONNECTED))
+ return 1;
+
+ req = RING_GET_REQUEST(&info->ring, info->ring.req_prod_pvt);
+
+ req->operation = SNDIF_OP_OPEN;
+ req->u.open.id = info->vcard->stream_id;
+ req->u.open.snd_params.format = format;
+ req->u.open.snd_params.channels = channels;
+ req->u.open.snd_params.rate = rate;
+ info->ring.req_prod_pvt++;
+
+ flush_requests(info);
+ return 0;
+}
+
+static int sndif_queue_request_close(struct sndfront_info *info)
+{
+ struct sndif_request *req;
+
+ if (unlikely(info->connected != SNDIF_STATE_CONNECTED))
+ return 1;
+
+ req = RING_GET_REQUEST(&info->ring, info->ring.req_prod_pvt);
+
+ req->operation = SNDIF_OP_CLOSE;
+ req->u.open.id = info->vcard->stream_id;
+
+ info->ring.req_prod_pvt++;
+
+ flush_requests(info);
+ return 0;
+}
+
+static int sndif_queue_request_write(struct sndfront_info *info,
+ unsigned int len)
+{
+ struct sndif_request *req;
+ grant_ref_t *gref;
+ int i;
+
+ if (unlikely(info->connected != SNDIF_STATE_CONNECTED))
+ return 1;
+
+ req = RING_GET_REQUEST(&info->ring, info->ring.req_prod_pvt);
+
+ req->operation = SNDIF_OP_WRITE;
+ req->u.rw.id = info->vcard->stream_id;
+
+ req->u.rw.len = len;
+
+ gref = info->vcard->grefs;
+
+ for (i = 0; i < SNDIF_MAX_PAGES_PER_REQUEST; i++)
+ req->u.rw.gref[i] = gref[i];
+
+ info->ring.req_prod_pvt++;
+
+ flush_requests(info);
+ return 0;
+}
+
+static int alsa_pcm_open(struct sndfront_info *info,
+ snd_pcm_format_t format,
+ unsigned int channels,
+ unsigned int rate)
+{
+ unsigned long answer_tout;
+
+ reinit_completion(&info->completion);
+
+ if (sndif_queue_request_open(info, format, channels, rate))
+ return -EIO;
+
+ answer_tout = msecs_to_jiffies(VSND_WAIT_ANSWER_TOUT);
+ if (wait_for_completion_interruptible_timeout(&info->completion,
+ answer_tout) <= 0)
+ return -ETIMEDOUT;
+
+ return info->bret_code;
+}
+
+static int alsa_pcm_close(struct sndfront_info *info)
+{
+ unsigned long answer_tout;
+
+ reinit_completion(&info->completion);
+
+ if (sndif_queue_request_close(info))
+ return -EIO;
+
+ answer_tout = msecs_to_jiffies(VSND_WAIT_ANSWER_TOUT);
+ if (wait_for_completion_interruptible_timeout(&info->completion,
+ answer_tout) <= 0)
+ return -ETIMEDOUT;
+
+ return info->bret_code;
+}
+
+static int alsa_pcm_write(struct sndfront_info *info, char __user *buf,
+ int len)
+{
+ unsigned char *shared_data;
+ unsigned long answer_tout;
+
+ shared_data = info->vcard->buf;
+
+ if (len > PAGE_SIZE * SNDIF_MAX_PAGES_PER_REQUEST)
+ return -EFAULT;
+
+ if (copy_from_user(shared_data, buf, len))
+ return -EFAULT;
+
+ reinit_completion(&info->completion);
+
+ if (sndif_queue_request_write(info, len))
+ return -EIO;
+
+ answer_tout = msecs_to_jiffies(VSND_WAIT_ANSWER_TOUT);
+ if (wait_for_completion_interruptible_timeout(&info->completion,
+ answer_tout) <= 0)
+ return -ETIMEDOUT;
+
+ return info->bret_code;
+}
+
+static int alsa_pcm_silence(struct sndfront_info *info, int len)
+{
+ unsigned char *shared_data;
+ unsigned long answer_tout;
+
+ shared_data = info->vcard->buf;
+
+ if (len > PAGE_SIZE * SNDIF_MAX_PAGES_PER_REQUEST)
+ return -EFAULT;
+
+ memset(shared_data, 0, len);
+
+ reinit_completion(&info->completion);
+
+ if (sndif_queue_request_write(info, len))
+ return -EIO;
+
+ answer_tout = msecs_to_jiffies(VSND_WAIT_ANSWER_TOUT);
+ if (wait_for_completion_interruptible_timeout(&info->completion,
+ answer_tout) <= 0)
+ return -ETIMEDOUT;
+
+ return info->bret_code;
+}
+
+static int sndif_setup_vcard(struct sndfront_info *info)
+{
+ grant_ref_t gref_head;
+ unsigned long mfn;
+ int ref;
+ int i;
+ int ret;
+
+ info->vcard->buf = vmalloc(SNDIF_MAX_PAGES_PER_REQUEST * PAGE_SIZE);
+ if (!info->vcard->buf) {
+ ret = -ENOMEM;
+ goto err_ret;
+ }
+
+ ret = gnttab_alloc_grant_references(SNDIF_MAX_PAGES_PER_REQUEST,
+ &gref_head);
+ if (ret)
+ goto err_vstream_free_buf;
+
+ for (i = 0; i < SNDIF_MAX_PAGES_PER_REQUEST; i++) {
+ ref = gnttab_claim_grant_reference(&gref_head);
+ BUG_ON(ref == -ENOSPC);
+
+ mfn = vmalloc_to_mfn(info->vcard->buf + PAGE_SIZE * i);
+
+ gnttab_grant_foreign_access_ref(ref, info->xbdev->otherend_id,
+ mfn, 0);
+
+ info->vcard->grefs[i] = ref;
+ }
+
+ gnttab_free_grant_references(gref_head);
+ return ret;
+
+err_vstream_free_buf:
+ vfree(info->vcard->buf);
+ for (i = 0; i < SNDIF_MAX_PAGES_PER_REQUEST; i++)
+ gnttab_end_foreign_access(info->vcard->grefs[i], 0, 0UL);
+
+ gnttab_free_grant_references(gref_head);
+err_ret:
+ return ret;
+}
+
+static void sndif_cleanup_vcard(struct sndfront_info *info)
+{
+ int i;
+
+ if (info->vcard->buf) {
+ vfree(info->vcard->buf);
+ for (i = 0; i < SNDIF_MAX_PAGES_PER_REQUEST; i++)
+ gnttab_end_foreign_access(info->vcard->grefs[i],
+ 0, 0UL);
+ }
+}
+
+static int sndif_add_virt_devices(struct sndfront_info *info,
+ unsigned int stream_id)
+{
+ int ret = 0;
+
+ struct vsnd_card *vcard;
+
+ vcard = kmalloc(sizeof(*vcard), GFP_KERNEL);
+
+ if (!vcard)
+ return -ENOMEM;
+
+ vcard->stream_id = stream_id;
+ vcard->fr_info = info;
+
+ info->vcard = vcard;
+
+ sndif_setup_vcard(info);
+
+ return ret;
+}
+
+static void sndif_cleanup_virt_devices(struct sndfront_info *info)
+{
+ if (info->vcard) {
+ sndif_cleanup_vcard(info);
+ kfree(info->vcard);
+ }
+}
+
+static void sndif_free(struct sndfront_info *info, int suspend)
+{
+ /* Free resources associated with old device channel. */
+ if (info->ring_ref != GRANT_INVALID_REF) {
+ gnttab_end_foreign_access(info->ring_ref, 0,
+ (unsigned long)info->ring.sring);
+ info->ring_ref = GRANT_INVALID_REF;
+ info->ring.sring = NULL;
+ }
+ if (info->irq)
+ unbind_from_irqhandler(info->irq, info);
+ info->evtchn = 0;
+ info->irq = 0;
+}
+
+static irqreturn_t sndif_interrupt(int irq, void *data)
+{
+ struct sndif_response *bret;
+ RING_IDX i, rp;
+ unsigned long flags;
+ struct sndfront_info *info = (struct sndfront_info *)data;
+ int error;
+
+ spin_lock_irqsave(&info->io_lock, flags);
+
+ if (unlikely(info->connected != SNDIF_STATE_CONNECTED)) {
+ spin_unlock_irqrestore(&info->io_lock, flags);
+ return IRQ_HANDLED;
+ }
+
+ again:
+ rp = info->ring.sring->rsp_prod;
+ rmb(); /* Ensure we see queued responses up to 'rp'. */
+
+ for (i = info->ring.rsp_cons; i != rp; i++) {
+ unsigned long id;
+
+ bret = RING_GET_RESPONSE(&info->ring, i);
+ id = bret->id;
+
+ error = (bret->status == SNDIF_RSP_OKAY) ? 0 : -EIO;
+ switch (bret->operation) {
+ case SNDIF_OP_OPEN:
+ case SNDIF_OP_CLOSE:
+ case SNDIF_OP_WRITE:
+ if (unlikely(bret->status != SNDIF_RSP_OKAY))
+ dev_dbg(&info->xbdev->dev,
+ "snddev data request error: %x\n",
+ bret->status);
+
+ info->bret_code = bret->status;
+ complete(&info->completion);
+ break;
+
+ default:
+ BUG();
+ }
+ }
+
+ info->ring.rsp_cons = i;
+
+ if (i != info->ring.req_prod_pvt) {
+ int more_to_do;
+
+ RING_FINAL_CHECK_FOR_RESPONSES(&info->ring, more_to_do);
+ if (more_to_do)
+ goto again;
+ } else {
+ info->ring.sring->rsp_event = i + 1;
+ }
+
+ spin_unlock_irqrestore(&info->io_lock, flags);
+ return IRQ_HANDLED;
+}
+
+static int setup_sndring(struct xenbus_device *dev,
+ struct sndfront_info *info)
+{
+ struct sndif_sring *sring;
+ int err;
+
+ info->ring_ref = GRANT_INVALID_REF;
+
+ sring = (struct sndif_sring *)__get_free_page(GFP_NOIO | __GFP_HIGH);
+ if (!sring) {
+ xenbus_dev_fatal(dev, -ENOMEM, "allocating shared ring");
+ return -ENOMEM;
+ }
+ SHARED_RING_INIT(sring);
+ FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
+
+ err = xenbus_grant_ring(dev, virt_to_mfn(info->ring.sring));
+ if (err < 0) {
+ free_page((unsigned long)sring);
+ info->ring.sring = NULL;
+ goto fail;
+ }
+ info->ring_ref = err;
+
+ err = xenbus_alloc_evtchn(dev, &info->evtchn);
+ if (err)
+ goto fail;
+
+ err = bind_evtchn_to_irqhandler(info->evtchn, sndif_interrupt, 0,
+ "sndif", info);
+ if (err <= 0) {
+ xenbus_dev_fatal(dev, err,
+ "bind_evtchn_to_irqhandler failed");
+ goto fail;
+ }
+ info->irq = err;
+
+ return 0;
+fail:
+ sndif_free(info, 0);
+ return err;
+}
+
+/* Common code used when first setting up, and when resuming. */
+static int talk_to_sndback(struct xenbus_device *dev,
+ struct sndfront_info *info)
+{
+ const char *message = NULL;
+ struct xenbus_transaction xbt;
+ int err;
+
+ /* Create shared ring, alloc event channel. */
+ err = setup_sndring(dev, info);
+ if (err)
+ goto out;
+
+again:
+ err = xenbus_transaction_start(&xbt);
+ if (err) {
+ xenbus_dev_fatal(dev, err, "starting transaction");
+ goto destroy_sndring;
+ }
+
+ err = xenbus_printf(xbt, dev->nodename,
+ "ring-ref", "%u", info->ring_ref);
+ if (err) {
+ message = "writing ring-ref";
+ goto abort_transaction;
+ }
+ err = xenbus_printf(xbt, dev->nodename,
+ "event-channel", "%u", info->evtchn);
+ if (err) {
+ message = "writing event-channel";
+ goto abort_transaction;
+ }
+
+ err = xenbus_transaction_end(xbt, 0);
+ if (err) {
+ if (err == -EAGAIN)
+ goto again;
+ xenbus_dev_fatal(dev, err, "completing transaction");
+ goto destroy_sndring;
+ }
+
+ xenbus_switch_state(dev, XenbusStateInitialised);
+
+ return 0;
+
+ abort_transaction:
+ xenbus_transaction_end(xbt, 1);
+ if (message)
+ xenbus_dev_fatal(dev, err, "%s", message);
+ destroy_sndring:
+ sndif_free(info, 0);
+ out:
+ return err;
+}
+
+static int virtualcard_pcm_trigger(struct snd_pcm_substream *substream, int
cmd)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ runtime->stop_threshold = runtime->buffer_size + 1;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ runtime->stop_threshold = runtime->buffer_size;
+ break;
+ }
+ return 0;
+}
+
+static int virtualcard_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ int err;
+ struct snd_virtualcard *virtualcard = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct stream_info *vcard_stream;
+
+ vcard_stream = get_vcard_stream(virtualcard, substream);
+
+ if ((runtime->rate != vcard_stream->rate) ||
+ (runtime->channels != vcard_stream->channels) ||
+ (runtime->format != vcard_stream->format)) {
+ if (vcard_stream->opened) {
+ err = alsa_pcm_close(virtualcard->fr_info);
+ if (err)
+ return err;
+
+ /* if closed successfully */
+ vcard_stream->opened = false;
+ }
+ err = alsa_pcm_open(virtualcard->fr_info, runtime->format,
+ runtime->channels, runtime->rate);
+ if (err)
+ return err;
+
+ /* if opened successfully */
+ vcard_stream->rate = runtime->rate;
+ vcard_stream->channels = runtime->channels;
+ vcard_stream->format = runtime->format;
+ vcard_stream->opened = true;
+ }
+ return 0;
+}
+
+static
+snd_pcm_uframes_t virtualcard_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_virtualcard *virtualcard = snd_pcm_substream_chip(substream);
+ snd_pcm_uframes_t buff_size = substream->runtime->buffer_size;
+ struct stream_info *vcard_stream;
+
+ vcard_stream = get_vcard_stream(virtualcard, substream);
+
+ if (vcard_stream->crossed) {
+ snd_pcm_uframes_t hw_base = substream->runtime->hw_ptr_base;
+
+ hw_base += buff_size;
+ if (hw_base >= substream->runtime->boundary)
+ hw_base = 0;
+
+ substream->runtime->hw_ptr_base = hw_base;
+ vcard_stream->crossed = 0;
+ }
+ return vcard_stream->position;
+}
+
+static int virtualcard_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ return 0;
+}
+
+static int virtualcard_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+static int virtualcard_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_virtualcard *virtualcard = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct stream_info *vcard_stream;
+
+ vcard_stream = get_vcard_stream(virtualcard, substream);
+
+ vcard_stream->channels = 0;
+ vcard_stream->rate = 0;
+ vcard_stream->position = 0;
+ vcard_stream->crossed = 0;
+ vcard_stream->format = 0;
+ vcard_stream->opened = false;
+
+ runtime->hw = virtualcard->pcm_hw;
+ runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_DOUBLE |
+ SNDRV_PCM_INFO_BATCH |
+ SNDRV_PCM_INFO_NONINTERLEAVED |
+ SNDRV_PCM_INFO_RESUME |
+ SNDRV_PCM_INFO_PAUSE);
+ runtime->hw.info |= SNDRV_PCM_INFO_INTERLEAVED;
+ return 0;
+}
+
+static int virtualcard_pcm_close(struct snd_pcm_substream *substream)
+{
+ int err;
+ struct snd_virtualcard *virtualcard = snd_pcm_substream_chip(substream);
+
+ err = alsa_pcm_close(virtualcard->fr_info);
+ if (err)
+ return err;
+
+ get_vcard_stream(virtualcard, substream)->opened = false;
+
+ return 0;
+}
+
+static int virtualcard_pcm_playback_copy(struct snd_pcm_substream *substream,
+ int channel, snd_pcm_uframes_t pos,
+ void __user *src,
+ snd_pcm_uframes_t count)
+{
+ struct snd_virtualcard *virtualcard = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct stream_info *vcard_stream = &virtualcard->streams[0];
+ snd_pcm_uframes_t stream_pos = vcard_stream->position;
+
+ vcard_stream->position = (stream_pos + count) % runtime->buffer_size;
+ vcard_stream->crossed = count / runtime->buffer_size;
+ return alsa_pcm_write(virtualcard->fr_info, src,
+ frames_to_bytes(runtime, count));
+}
+
+static int virtualcard_pcm_playback_silence(struct snd_pcm_substream
*substream,
+ int channel, snd_pcm_uframes_t pos,
+ snd_pcm_uframes_t count)
+{
+ struct snd_virtualcard *virtualcard = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct stream_info *vcard_stream = &virtualcard->streams[0];
+ snd_pcm_uframes_t stream_pos = vcard_stream->position;
+
+ vcard_stream->position = (stream_pos + count) % runtime->buffer_size;
+ vcard_stream->crossed = count / runtime->buffer_size;
+
+ return alsa_pcm_silence(virtualcard->fr_info,
+ frames_to_bytes(runtime, count));
+}
+
+static int virtualcard_pcm_capture_copy(struct snd_pcm_substream *substream,
+ int channel, snd_pcm_uframes_t pos,
+ void __user *dst,
+ snd_pcm_uframes_t count)
+{
+ struct snd_virtualcard *virtualcard = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct stream_info *vcard_stream = &virtualcard->streams[1];
+ snd_pcm_uframes_t stream_pos = vcard_stream->position;
+
+ vcard_stream->position = (stream_pos + count) % runtime->buffer_size;
+ vcard_stream->crossed = count / runtime->buffer_size;
+
+ return 0;
+}
+
+static struct snd_pcm_ops virtualcard_pcm_playback_ops = {
+ .open = virtualcard_pcm_open,
+ .close = virtualcard_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = virtualcard_pcm_hw_params,
+ .hw_free = virtualcard_pcm_hw_free,
+ .prepare = virtualcard_pcm_prepare,
+ .trigger = virtualcard_pcm_trigger,
+ .pointer = virtualcard_pcm_pointer,
+ .copy = virtualcard_pcm_playback_copy,
+ .silence = virtualcard_pcm_playback_silence,
+};
+
+static struct snd_pcm_ops virtualcard_pcm_capture_ops = {
+ .open = virtualcard_pcm_open,
+ .close = virtualcard_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = virtualcard_pcm_hw_params,
+ .hw_free = virtualcard_pcm_hw_free,
+ .prepare = virtualcard_pcm_prepare,
+ .trigger = virtualcard_pcm_trigger,
+ .pointer = virtualcard_pcm_pointer,
+ .copy = virtualcard_pcm_capture_copy,
+};
+
+static int snd_card_virtualcard_pcm(struct snd_virtualcard *virtualcard,
+ int device, int substreams)
+{
+ struct snd_pcm *pcm;
+ int err;
+
+ err = snd_pcm_new(virtualcard->card, "Virtual card PCM", device,
+ substreams, substreams, &pcm);
+ if (err < 0)
+ return err;
+ virtualcard->pcm = pcm;
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+ &virtualcard_pcm_playback_ops);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
+ &virtualcard_pcm_capture_ops);
+ pcm->private_data = virtualcard;
+ pcm->info_flags = 0;
+ strcpy(pcm->name, "Virtual card PCM");
+
+ return 0;
+}
+
+/*
+ * mixer interface
+ */
+
+#define VIRTUALCARD_VOLUME(xname, xindex, addr) { \
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
+ .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | \
+ SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
+ .name = xname, \
+ .index = xindex, \
+ .info = snd_virtualcard_volume_info, \
+ .get = snd_virtualcard_volume_get, \
+ .put = snd_virtualcard_volume_put, \
+ .private_value = addr, \
+ .tlv = { .p = db_scale_virtualcard } \
+}
+
+static int snd_virtualcard_volume_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ uinfo->count = 2;
+ uinfo->value.integer.min = -50;
+ uinfo->value.integer.max = 100;
+ return 0;
+}
+
+static int snd_virtualcard_volume_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_virtualcard *virtualcard = snd_kcontrol_chip(kcontrol);
+ int addr = kcontrol->private_value;
+
+ spin_lock_irq(&virtualcard->mixer_lock);
+ ucontrol->value.integer.value[0] = virtualcard->mixer_volume[addr][0];
+ ucontrol->value.integer.value[1] = virtualcard->mixer_volume[addr][1];
+ spin_unlock_irq(&virtualcard->mixer_lock);
+ return 0;
+}
+
+static int snd_virtualcard_volume_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_virtualcard *virtualcard = snd_kcontrol_chip(kcontrol);
+ int change, addr = kcontrol->private_value;
+ int left, right;
+
+ left = ucontrol->value.integer.value[0];
+ if (left < -50)
+ left = -50;
+ if (left > 100)
+ left = 100;
+ right = ucontrol->value.integer.value[1];
+ if (right < -50)
+ right = -50;
+ if (right > 100)
+ right = 100;
+ spin_lock_irq(&virtualcard->mixer_lock);
+ change = virtualcard->mixer_volume[addr][0] != left ||
+ virtualcard->mixer_volume[addr][1] != right;
+ virtualcard->mixer_volume[addr][0] = left;
+ virtualcard->mixer_volume[addr][1] = right;
+ spin_unlock_irq(&virtualcard->mixer_lock);
+ return change;
+}
+
+static const DECLARE_TLV_DB_SCALE(db_scale_virtualcard, -4500, 30, 0);
+
+#define VIRTUALCARD_CAPSRC(xname, xindex, addr) { \
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
+ .name = xname, \
+ .index = xindex, \
+ .info = snd_virtualcard_capsrc_info, \
+ .get = snd_virtualcard_capsrc_get, \
+ .put = snd_virtualcard_capsrc_put, \
+ .private_value = addr \
+}
+
+#define snd_virtualcard_capsrc_info snd_ctl_boolean_stereo_info
+
+static int snd_virtualcard_capsrc_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_virtualcard *virtualcard = snd_kcontrol_chip(kcontrol);
+ int addr = kcontrol->private_value;
+
+ spin_lock_irq(&virtualcard->mixer_lock);
+ ucontrol->value.integer.value[0] = virtualcard->capture_source[addr][0];
+ ucontrol->value.integer.value[1] = virtualcard->capture_source[addr][1];
+ spin_unlock_irq(&virtualcard->mixer_lock);
+ return 0;
+}
+
+static int snd_virtualcard_capsrc_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_virtualcard *virtualcard = snd_kcontrol_chip(kcontrol);
+ int change, addr = kcontrol->private_value;
+ int left, right;
+
+ left = ucontrol->value.integer.value[0] & 1;
+ right = ucontrol->value.integer.value[1] & 1;
+ spin_lock_irq(&virtualcard->mixer_lock);
+ change = virtualcard->capture_source[addr][0] != left &&
+ virtualcard->capture_source[addr][1] != right;
+ virtualcard->capture_source[addr][0] = left;
+ virtualcard->capture_source[addr][1] = right;
+ spin_unlock_irq(&virtualcard->mixer_lock);
+ return change;
+}
+
+static struct snd_kcontrol_new snd_virtualcard_controls[] = {
+VIRTUALCARD_VOLUME("Master Out Volume", 0, MIXER_ADDR_MASTER_OUT),
+VIRTUALCARD_CAPSRC("Master Out Switch", 0, MIXER_ADDR_MASTER_OUT),
+VIRTUALCARD_VOLUME("Master In Volume", 0, MIXER_ADDR_MASTER_IN),
+VIRTUALCARD_CAPSRC("Master In Switch", 0, MIXER_ADDR_MASTER_IN),
+};
+
+static int snd_card_virtualcard_new_mixer(struct snd_virtualcard *virtualcard)
+{
+ struct snd_card *card = virtualcard->card;
+ struct snd_kcontrol *kcontrol;
+ unsigned int idx;
+ int err;
+
+ spin_lock_init(&virtualcard->mixer_lock);
+ strcpy(card->mixername, "Virtual card Mixer");
+
+ for (idx = 0; idx < ARRAY_SIZE(snd_virtualcard_controls); idx++) {
+ kcontrol = snd_ctl_new1(&snd_virtualcard_controls[idx],
+ virtualcard);
+ err = snd_ctl_add(card, kcontrol);
+ if (err < 0)
+ return err;
+ }
+ return 0;
+}
+
+/* #define CONFIG_SND_DEBUG */
+/* #define CONFIG_PROC_FS */
+#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
+/*
+ * proc interface
+ */
+static void print_formats(struct snd_virtualcard *virtualcard,
+ struct snd_info_buffer *buffer)
+{
+ int i;
+
+ for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
+ if (virtualcard->pcm_hw.formats & (1ULL << i))
+ snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
+ }
+}
+
+static void print_rates(struct snd_virtualcard *virtualcard,
+ struct snd_info_buffer *buffer)
+{
+ static int rates[] = {
+ 8000, 11025, 16000, 22050, 32000, 44100, 48000,
+ 64000, 88200, 96000, 176400, 192000,
+ };
+ int i;
+
+ if (virtualcard->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
+ snd_iprintf(buffer, " continuous");
+ if (virtualcard->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
+ snd_iprintf(buffer, " knot");
+ for (i = 0; i < ARRAY_SIZE(rates); i++)
+ if (virtualcard->pcm_hw.rates & (1 << i))
+ snd_iprintf(buffer, " %d", rates[i]);
+}
+
+#define get_virtualcard_int_ptr(virtualcard, ofs) \
+ (unsigned int *)((char *)&((virtualcard)->pcm_hw) + (ofs))
+#define get_virtualcard_ll_ptr(virtualcard, ofs) \
+ (unsigned long long *)((char *)&((virtualcard)->pcm_hw) + (ofs))
+
+struct virtualcard_hw_field {
+ const char *name;
+ const char *format;
+ unsigned int offset;
+ unsigned int size;
+};
+
+#define FIELD_ENTRY(item, fmt) { \
+ .name = #item, \
+ .format = fmt, \
+ .offset = offsetof(struct snd_pcm_hardware, item), \
+ .size = sizeof(virtualcard_pcm_hardware.item) \
+}
+
+static struct virtualcard_hw_field fields[] = {
+ FIELD_ENTRY(formats, "%#llx"),
+ FIELD_ENTRY(rates, "%#x"),
+ FIELD_ENTRY(rate_min, "%d"),
+ FIELD_ENTRY(rate_max, "%d"),
+ FIELD_ENTRY(channels_min, "%d"),
+ FIELD_ENTRY(channels_max, "%d"),
+ FIELD_ENTRY(buffer_bytes_max, "%ld"),
+ FIELD_ENTRY(period_bytes_min, "%ld"),
+ FIELD_ENTRY(period_bytes_max, "%ld"),
+ FIELD_ENTRY(periods_min, "%d"),
+ FIELD_ENTRY(periods_max, "%d"),
+};
+
+static void virtualcard_proc_read(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ struct snd_virtualcard *virtualcard = entry->private_data;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(fields); i++) {
+ snd_iprintf(buffer, "%s ", fields[i].name);
+ if (fields[i].size == sizeof(int))
+ snd_iprintf(buffer, fields[i].format,
+ *get_virtualcard_int_ptr(virtualcard,
+ fields[i].offset));
+ else
+ snd_iprintf(buffer, fields[i].format,
+ *get_virtualcard_ll_ptr(virtualcard,
+ fields[i].offset));
+ if (!strcmp(fields[i].name, "formats"))
+ print_formats(virtualcard, buffer);
+ else if (!strcmp(fields[i].name, "rates"))
+ print_rates(virtualcard, buffer);
+ snd_iprintf(buffer, "\n");
+ }
+}
+
+static void virtualcard_proc_write(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ struct snd_virtualcard *virtualcard = entry->private_data;
+ char line[64];
+
+ while (!snd_info_get_line(buffer, line, sizeof(line))) {
+ char item[20];
+ const char *ptr;
+ unsigned long long val;
+ unsigned int offset;
+ int i;
+
+ ptr = snd_info_get_str(item, line, sizeof(item));
+ for (i = 0; i < ARRAY_SIZE(fields); i++) {
+ if (!strcmp(item, fields[i].name))
+ break;
+ }
+ if (i >= ARRAY_SIZE(fields))
+ continue;
+ snd_info_get_str(item, ptr, sizeof(item));
+ if (kstrtoull(item, 0, &val))
+ continue;
+
+ offset = fields[i].offset;
+ if (fields[i].size == sizeof(int))
+ *get_virtualcard_int_ptr(virtualcard, offset) = val;
+ else
+ *get_virtualcard_ll_ptr(virtualcard, offset) = val;
+ }
+}
+
+static void virtualcard_proc_init(struct snd_virtualcard *chip)
+{
+ struct snd_info_entry *entry;
+
+ if (!snd_card_proc_new(chip->card, "virtualcard_pcm", &entry)) {
+ snd_info_set_text_ops(entry, chip, virtualcard_proc_read);
+ entry->c.text.write = virtualcard_proc_write;
+ entry->mode |= S_IWUSR;
+ entry->private_data = chip;
+ }
+}
+#else
+#define virtualcard_proc_init(x)
+#endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
+
+static int snd_virtualcard_probe(struct platform_device *devptr)
+{
+ struct snd_card *card;
+ struct snd_virtualcard *virtualcard;
+ struct virtualcard_model *m = NULL;
+ int err;
+ int dev = devptr->id;
+ struct snd_pcm_hardware *pcm_hw;
+
+ err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
+ sizeof(struct snd_virtualcard), &card);
+ if (err < 0)
+ return err;
+ virtualcard = card->private_data;
+ virtualcard->card = card;
+ virtualcard->fr_info =
+ (*((struct sndfront_info **)devptr->dev.platform_data));
+
+ m = virtualcard_models[0];
+
+ err = snd_card_virtualcard_pcm(virtualcard, 0, 1);
+ if (err < 0)
+ goto __nodev;
+
+ virtualcard->pcm_hw = virtualcard_pcm_hardware;
+ pcm_hw = &virtualcard->pcm_hw;
+ if (m) {
+ if (m->formats)
+ pcm_hw->formats = m->formats;
+ if (m->buffer_bytes_max)
+ pcm_hw->buffer_bytes_max = m->buffer_bytes_max;
+ if (m->period_bytes_min)
+ pcm_hw->period_bytes_min = m->period_bytes_min;
+ if (m->period_bytes_max)
+ pcm_hw->period_bytes_max = m->period_bytes_max;
+ if (m->periods_min)
+ pcm_hw->periods_min = m->periods_min;
+ if (m->periods_max)
+ pcm_hw->periods_max = m->periods_max;
+ if (m->rates)
+ pcm_hw->rates = m->rates;
+ if (m->rate_min)
+ pcm_hw->rate_min = m->rate_min;
+ if (m->rate_max)
+ pcm_hw->rate_max = m->rate_max;
+ if (m->channels_min)
+ pcm_hw->channels_min = m->channels_min;
+ if (m->channels_max)
+ pcm_hw->channels_max = m->channels_max;
+ }
+
+ err = snd_card_virtualcard_new_mixer(virtualcard);
+ if (err < 0)
+ goto __nodev;
+ strcpy(card->driver, "Virtual card");
+ strcpy(card->shortname, "Virtual card");
+ sprintf(card->longname, "Virtual card %i", dev + 1);
+
+ virtualcard_proc_init(virtualcard);
+
+ snd_card_set_dev(card, &devptr->dev);
+
+ err = snd_card_register(card);
+ if (err == 0) {
+ platform_set_drvdata(devptr, card);
+ return 0;
+ }
+__nodev:
+ snd_card_free(card);
+ return err;
+}
+
+static int snd_virtualcard_remove(struct platform_device *devptr)
+{
+ snd_card_free(platform_get_drvdata(devptr));
+ platform_set_drvdata(devptr, NULL);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int snd_virtualcard_suspend(struct device *pdev)
+{
+ struct snd_card *card = dev_get_drvdata(pdev);
+ struct snd_virtualcard *virtualcard = card->private_data;
+
+ snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
+ snd_pcm_suspend_all(virtualcard->pcm);
+ return 0;
+}
+
+static int snd_virtualcard_resume(struct device *pdev)
+{
+ struct snd_card *card = dev_get_drvdata(pdev);
+
+ snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(snd_virtualcard_pm, snd_virtualcard_suspend,
+ snd_virtualcard_resume);
+#define SND_VIRTUALCARD_PM_OPS (&snd_virtualcard_pm)
+#else
+#define SND_VIRTUALCARD_PM_OPS NULL
+#endif
+
+#define SND_VIRTUALCARD_DRIVER "snd_virtualcard"
+
+static struct platform_driver snd_virtualcard_driver = {
+ .probe = snd_virtualcard_probe,
+ .remove = snd_virtualcard_remove,
+ .driver = {
+ .name = SND_VIRTUALCARD_DRIVER,
+ .owner = THIS_MODULE,
+ .pm = SND_VIRTUALCARD_PM_OPS,
+ },
+};
+
+/**
+ * Entry point to this code when a new device is created. Allocate the basic
+ * structures and the ring buffer for communication with the backend, and
+ * inform the backend of the appropriate details for those. Switch to
+ * Initialised state.
+ */
+static int sndfront_probe(struct xenbus_device *dev,
+ const struct xenbus_device_id *id)
+{
+ int err;
+ struct sndfront_info *info;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
+ return -ENOMEM;
+ }
+
+ mutex_init(&info->mutex);
+ spin_lock_init(&info->io_lock);
+ init_completion(&info->completion);
+ info->xbdev = dev;
+
+ dev_set_drvdata(&dev->dev, info);
+
+ err = talk_to_sndback(dev, info);
+ if (err)
+ goto err_free_info;
+
+ info->card_dev = platform_device_register_data(NULL,
+ SND_VIRTUALCARD_DRIVER,
+ -1, &info, sizeof(info));
+ if (IS_ERR(info->card_dev)) {
+ err = -ENODEV;
+ goto err_free_info;
+ }
+ return 0;
+
+err_free_info:
+ kfree(info);
+ dev_set_drvdata(&dev->dev, NULL);
+ return err;
+}
+
+/**
+ * We are reconnecting to the backend, due to a suspend/resume, or a backend
+ * driver restart. We tear down our blkif structure and recreate it, but
+ * leave the device-layer structures intact so that this is transparent to the
+ * rest of the kernel.
+ */
+static int sndfront_resume(struct xenbus_device *dev)
+{
+ struct sndfront_info *info = dev_get_drvdata(&dev->dev);
+ int err;
+
+ dev_dbg(&dev->dev, "sndfront_resume: %s\n", dev->nodename);
+
+ sndif_free(info, info->connected == SNDIF_STATE_CONNECTED);
+
+ err = talk_to_sndback(dev, info);
+ if (info->connected == SNDIF_STATE_SUSPENDED && !err)
+ info->connected = SNDIF_STATE_CONNECTED;
+
+ return err;
+}
+
+static void
+sndfront_closing(struct sndfront_info *info)
+{
+ struct xenbus_device *xbdev = info->xbdev;
+
+ mutex_lock(&info->mutex);
+
+ if (xbdev->state == XenbusStateClosing) {
+ mutex_unlock(&info->mutex);
+ return;
+ }
+
+ mutex_unlock(&info->mutex);
+
+ xenbus_frontend_closed(xbdev);
+ sndif_cleanup_virt_devices(info);
+}
+
+/*
+ * Invoked when the backend is finally 'ready' (and has told produced
+ * the details about the physical device - #sectors, size, etc).
+ */
+static void sndfront_connect(struct sndfront_info *info)
+{
+ unsigned int stream_id;
+ int err;
+
+ switch (info->connected) {
+ case SNDIF_STATE_CONNECTED:
+
+ /* fall through */
+ case SNDIF_STATE_SUSPENDED:
+ return;
+
+ default:
+ break;
+ }
+
+ dev_dbg(&info->xbdev->dev, "%s:%s.\n",
+ __func__, info->xbdev->otherend);
+
+ xenbus_switch_state(info->xbdev, XenbusStateConnected);
+
+ err = xenbus_gather(XBT_NIL, info->xbdev->otherend, "stream_id", "%u",
+ &stream_id, NULL);
+ if (err)
+ return;
+
+ err = sndif_add_virt_devices(info, stream_id);
+ if (err)
+ return;
+
+ spin_lock_irq(&info->io_lock);
+ info->connected = SNDIF_STATE_CONNECTED;
+ spin_unlock_irq(&info->io_lock);
+}
+
+/**
+ * Callback received when the backend's state changes.
+ */
+static void sndback_changed(struct xenbus_device *dev,
+ enum xenbus_state backend_state)
+{
+ struct sndfront_info *info = dev_get_drvdata(&dev->dev);
+
+ dev_dbg(&dev->dev, "sndfront:sndback_changed to state %d.\n",
+ backend_state);
+
+ switch (backend_state) {
+ case XenbusStateInitialising:
+ case XenbusStateInitWait:
+ case XenbusStateInitialised:
+ case XenbusStateReconfiguring:
+ case XenbusStateReconfigured:
+ case XenbusStateUnknown:
+ case XenbusStateClosed:
+ break;
+
+ case XenbusStateConnected:
+ sndfront_connect(info);
+ break;
+
+ case XenbusStateClosing:
+ sndfront_closing(info);
+ break;
+ }
+}
+
+static int sndfront_remove(struct xenbus_device *xbdev)
+{
+ struct sndfront_info *info = dev_get_drvdata(&xbdev->dev);
+
+ dev_dbg(&xbdev->dev, "%s removed", xbdev->nodename);
+
+ platform_device_unregister(info->card_dev);
+
+ sndif_free(info, 0);
+
+ return 0;
+}
+
+static const struct xenbus_device_id xen_snd_ids[] = {
+ { "vsnd" },
+ { "" }
+};
+
+static struct xenbus_driver xen_snd_driver = {
+ .name = "xensnd",
+ .ids = xen_snd_ids,
+ .probe = sndfront_probe,
+ .remove = sndfront_remove,
+ .resume = sndfront_resume,
+ .otherend_changed = sndback_changed,
+};
+
+static int __init xen_snd_front_init(void)
+{
+ int ret = 0;
+
+ /*FIXME: xen_pv_domain() should be here, but ARM hardcoded to hvm*/
+ if (!xen_domain())
+ return -ENODEV;
+
+ /* Nothing to do if running in dom0. */
+ if (xen_initial_domain())
+ return -ENODEV;
+
+ ret = xenbus_register_frontend(&xen_snd_driver);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&snd_virtualcard_driver);
+
+ return ret;
+}
+
+static void __exit xen_snd_front_cleanup(void)
+{
+ xenbus_unregister_driver(&xen_snd_driver);
+ platform_driver_unregister(&snd_virtualcard_driver);
+}
+
+module_init(xen_snd_front_init);
+module_exit(xen_snd_front_cleanup);
+
+MODULE_DESCRIPTION("Xen virtual audio device frontend");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("xen:vsnd");
--
1.9.1
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