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![Takashi Iwai](/assets/img/avatar_default.png)
PCM core deals the empty ioctl field now as default(*).
Let's kill the redundant lines.
(*) commit fc033cbf6f
("ALSA: pcm: Allow NULL ioctl ops")
Link: https://lore.kernel.org/r/20191210061145.24641-24-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
872 lines
22 KiB
C
872 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
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/*
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* Xen para-virtual sound device
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*
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* Copyright (C) 2016-2018 EPAM Systems Inc.
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*
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* Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
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*/
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#include <linux/platform_device.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <xen/xenbus.h>
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#include <xen/xen-front-pgdir-shbuf.h>
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#include "xen_snd_front.h"
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#include "xen_snd_front_alsa.h"
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#include "xen_snd_front_cfg.h"
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#include "xen_snd_front_evtchnl.h"
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struct xen_snd_front_pcm_stream_info {
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struct xen_snd_front_info *front_info;
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struct xen_snd_front_evtchnl_pair *evt_pair;
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/* This is the shared buffer with its backing storage. */
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struct xen_front_pgdir_shbuf shbuf;
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u8 *buffer;
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size_t buffer_sz;
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int num_pages;
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struct page **pages;
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int index;
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bool is_open;
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struct snd_pcm_hardware pcm_hw;
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/* Number of processed frames as reported by the backend. */
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snd_pcm_uframes_t be_cur_frame;
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/* Current HW pointer to be reported via .period callback. */
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atomic_t hw_ptr;
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/* Modulo of the number of processed frames - for period detection. */
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u32 out_frames;
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};
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struct xen_snd_front_pcm_instance_info {
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struct xen_snd_front_card_info *card_info;
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struct snd_pcm *pcm;
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struct snd_pcm_hardware pcm_hw;
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int num_pcm_streams_pb;
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struct xen_snd_front_pcm_stream_info *streams_pb;
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int num_pcm_streams_cap;
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struct xen_snd_front_pcm_stream_info *streams_cap;
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};
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struct xen_snd_front_card_info {
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struct xen_snd_front_info *front_info;
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struct snd_card *card;
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struct snd_pcm_hardware pcm_hw;
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int num_pcm_instances;
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struct xen_snd_front_pcm_instance_info *pcm_instances;
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};
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struct alsa_sndif_sample_format {
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u8 sndif;
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snd_pcm_format_t alsa;
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};
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struct alsa_sndif_hw_param {
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u8 sndif;
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snd_pcm_hw_param_t alsa;
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};
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static const struct alsa_sndif_sample_format ALSA_SNDIF_FORMATS[] = {
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{
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.sndif = XENSND_PCM_FORMAT_U8,
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.alsa = SNDRV_PCM_FORMAT_U8
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},
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{
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.sndif = XENSND_PCM_FORMAT_S8,
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.alsa = SNDRV_PCM_FORMAT_S8
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},
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{
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.sndif = XENSND_PCM_FORMAT_U16_LE,
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.alsa = SNDRV_PCM_FORMAT_U16_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_U16_BE,
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.alsa = SNDRV_PCM_FORMAT_U16_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S16_LE,
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.alsa = SNDRV_PCM_FORMAT_S16_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S16_BE,
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.alsa = SNDRV_PCM_FORMAT_S16_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_U24_LE,
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.alsa = SNDRV_PCM_FORMAT_U24_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_U24_BE,
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.alsa = SNDRV_PCM_FORMAT_U24_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S24_LE,
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.alsa = SNDRV_PCM_FORMAT_S24_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S24_BE,
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.alsa = SNDRV_PCM_FORMAT_S24_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_U32_LE,
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.alsa = SNDRV_PCM_FORMAT_U32_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_U32_BE,
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.alsa = SNDRV_PCM_FORMAT_U32_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S32_LE,
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.alsa = SNDRV_PCM_FORMAT_S32_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S32_BE,
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.alsa = SNDRV_PCM_FORMAT_S32_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_A_LAW,
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.alsa = SNDRV_PCM_FORMAT_A_LAW
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},
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{
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.sndif = XENSND_PCM_FORMAT_MU_LAW,
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.alsa = SNDRV_PCM_FORMAT_MU_LAW
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},
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{
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.sndif = XENSND_PCM_FORMAT_F32_LE,
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.alsa = SNDRV_PCM_FORMAT_FLOAT_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_F32_BE,
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.alsa = SNDRV_PCM_FORMAT_FLOAT_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_F64_LE,
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.alsa = SNDRV_PCM_FORMAT_FLOAT64_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_F64_BE,
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.alsa = SNDRV_PCM_FORMAT_FLOAT64_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE,
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.alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE,
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.alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_IMA_ADPCM,
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.alsa = SNDRV_PCM_FORMAT_IMA_ADPCM
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},
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{
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.sndif = XENSND_PCM_FORMAT_MPEG,
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.alsa = SNDRV_PCM_FORMAT_MPEG
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},
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{
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.sndif = XENSND_PCM_FORMAT_GSM,
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.alsa = SNDRV_PCM_FORMAT_GSM
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},
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};
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static int to_sndif_format(snd_pcm_format_t format)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
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if (ALSA_SNDIF_FORMATS[i].alsa == format)
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return ALSA_SNDIF_FORMATS[i].sndif;
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return -EINVAL;
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}
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static u64 to_sndif_formats_mask(u64 alsa_formats)
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{
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u64 mask;
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int i;
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mask = 0;
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for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
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if (pcm_format_to_bits(ALSA_SNDIF_FORMATS[i].alsa) & alsa_formats)
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mask |= BIT_ULL(ALSA_SNDIF_FORMATS[i].sndif);
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return mask;
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}
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static u64 to_alsa_formats_mask(u64 sndif_formats)
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{
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u64 mask;
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int i;
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mask = 0;
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for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
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if (BIT_ULL(ALSA_SNDIF_FORMATS[i].sndif) & sndif_formats)
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mask |= pcm_format_to_bits(ALSA_SNDIF_FORMATS[i].alsa);
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return mask;
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}
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static void stream_clear(struct xen_snd_front_pcm_stream_info *stream)
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{
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stream->is_open = false;
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stream->be_cur_frame = 0;
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stream->out_frames = 0;
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atomic_set(&stream->hw_ptr, 0);
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xen_snd_front_evtchnl_pair_clear(stream->evt_pair);
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memset(&stream->shbuf, 0, sizeof(stream->shbuf));
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stream->buffer = NULL;
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stream->buffer_sz = 0;
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stream->pages = NULL;
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stream->num_pages = 0;
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}
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static void stream_free(struct xen_snd_front_pcm_stream_info *stream)
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{
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xen_front_pgdir_shbuf_unmap(&stream->shbuf);
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xen_front_pgdir_shbuf_free(&stream->shbuf);
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if (stream->buffer)
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free_pages_exact(stream->buffer, stream->buffer_sz);
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kfree(stream->pages);
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stream_clear(stream);
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}
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static struct xen_snd_front_pcm_stream_info *
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stream_get(struct snd_pcm_substream *substream)
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{
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struct xen_snd_front_pcm_instance_info *pcm_instance =
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snd_pcm_substream_chip(substream);
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struct xen_snd_front_pcm_stream_info *stream;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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stream = &pcm_instance->streams_pb[substream->number];
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else
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stream = &pcm_instance->streams_cap[substream->number];
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return stream;
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}
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static int alsa_hw_rule(struct snd_pcm_hw_params *params,
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struct snd_pcm_hw_rule *rule)
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{
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struct xen_snd_front_pcm_stream_info *stream = rule->private;
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struct device *dev = &stream->front_info->xb_dev->dev;
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struct snd_mask *formats =
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hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
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struct snd_interval *rates =
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hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
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struct snd_interval *channels =
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hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
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struct snd_interval *period =
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hw_param_interval(params,
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SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
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struct snd_interval *buffer =
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hw_param_interval(params,
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SNDRV_PCM_HW_PARAM_BUFFER_SIZE);
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struct xensnd_query_hw_param req;
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struct xensnd_query_hw_param resp;
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struct snd_interval interval;
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struct snd_mask mask;
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u64 sndif_formats;
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int changed, ret;
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/* Collect all the values we need for the query. */
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req.formats = to_sndif_formats_mask((u64)formats->bits[0] |
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(u64)(formats->bits[1]) << 32);
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req.rates.min = rates->min;
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req.rates.max = rates->max;
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req.channels.min = channels->min;
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req.channels.max = channels->max;
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req.buffer.min = buffer->min;
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req.buffer.max = buffer->max;
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req.period.min = period->min;
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req.period.max = period->max;
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ret = xen_snd_front_stream_query_hw_param(&stream->evt_pair->req,
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&req, &resp);
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if (ret < 0) {
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/* Check if this is due to backend communication error. */
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if (ret == -EIO || ret == -ETIMEDOUT)
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dev_err(dev, "Failed to query ALSA HW parameters\n");
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return ret;
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}
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/* Refine HW parameters after the query. */
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changed = 0;
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sndif_formats = to_alsa_formats_mask(resp.formats);
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snd_mask_none(&mask);
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mask.bits[0] = (u32)sndif_formats;
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mask.bits[1] = (u32)(sndif_formats >> 32);
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ret = snd_mask_refine(formats, &mask);
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if (ret < 0)
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return ret;
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changed |= ret;
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interval.openmin = 0;
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interval.openmax = 0;
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interval.integer = 1;
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interval.min = resp.rates.min;
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interval.max = resp.rates.max;
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ret = snd_interval_refine(rates, &interval);
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if (ret < 0)
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return ret;
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changed |= ret;
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interval.min = resp.channels.min;
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interval.max = resp.channels.max;
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ret = snd_interval_refine(channels, &interval);
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if (ret < 0)
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return ret;
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changed |= ret;
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interval.min = resp.buffer.min;
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interval.max = resp.buffer.max;
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ret = snd_interval_refine(buffer, &interval);
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if (ret < 0)
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return ret;
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changed |= ret;
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interval.min = resp.period.min;
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interval.max = resp.period.max;
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ret = snd_interval_refine(period, &interval);
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if (ret < 0)
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return ret;
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changed |= ret;
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return changed;
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}
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static int alsa_open(struct snd_pcm_substream *substream)
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{
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struct xen_snd_front_pcm_instance_info *pcm_instance =
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snd_pcm_substream_chip(substream);
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struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct xen_snd_front_info *front_info =
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pcm_instance->card_info->front_info;
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struct device *dev = &front_info->xb_dev->dev;
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int ret;
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/*
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* Return our HW properties: override defaults with those configured
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* via XenStore.
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*/
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runtime->hw = stream->pcm_hw;
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runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_DOUBLE |
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SNDRV_PCM_INFO_BATCH |
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SNDRV_PCM_INFO_NONINTERLEAVED |
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SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_PAUSE);
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runtime->hw.info |= SNDRV_PCM_INFO_INTERLEAVED;
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stream->evt_pair = &front_info->evt_pairs[stream->index];
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stream->front_info = front_info;
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stream->evt_pair->evt.u.evt.substream = substream;
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stream_clear(stream);
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xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, true);
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ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
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alsa_hw_rule, stream,
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SNDRV_PCM_HW_PARAM_FORMAT, -1);
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if (ret) {
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dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_FORMAT\n");
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return ret;
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}
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ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
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alsa_hw_rule, stream,
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SNDRV_PCM_HW_PARAM_RATE, -1);
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if (ret) {
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dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_RATE\n");
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return ret;
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}
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ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
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alsa_hw_rule, stream,
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SNDRV_PCM_HW_PARAM_CHANNELS, -1);
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if (ret) {
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dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_CHANNELS\n");
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return ret;
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}
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ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
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alsa_hw_rule, stream,
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SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
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if (ret) {
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dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_PERIOD_SIZE\n");
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return ret;
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}
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ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
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alsa_hw_rule, stream,
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SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
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if (ret) {
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dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_BUFFER_SIZE\n");
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return ret;
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}
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return 0;
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}
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static int alsa_close(struct snd_pcm_substream *substream)
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{
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struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
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xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, false);
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return 0;
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}
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static int shbuf_setup_backstore(struct xen_snd_front_pcm_stream_info *stream,
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size_t buffer_sz)
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{
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int i;
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stream->buffer = alloc_pages_exact(buffer_sz, GFP_KERNEL);
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if (!stream->buffer)
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return -ENOMEM;
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stream->buffer_sz = buffer_sz;
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stream->num_pages = DIV_ROUND_UP(stream->buffer_sz, PAGE_SIZE);
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stream->pages = kcalloc(stream->num_pages, sizeof(struct page *),
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GFP_KERNEL);
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if (!stream->pages)
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return -ENOMEM;
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for (i = 0; i < stream->num_pages; i++)
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stream->pages[i] = virt_to_page(stream->buffer + i * PAGE_SIZE);
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return 0;
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}
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static int alsa_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
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struct xen_snd_front_info *front_info = stream->front_info;
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struct xen_front_pgdir_shbuf_cfg buf_cfg;
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int ret;
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/*
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* This callback may be called multiple times,
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* so free the previously allocated shared buffer if any.
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*/
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stream_free(stream);
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ret = shbuf_setup_backstore(stream, params_buffer_bytes(params));
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if (ret < 0)
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goto fail;
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memset(&buf_cfg, 0, sizeof(buf_cfg));
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buf_cfg.xb_dev = front_info->xb_dev;
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buf_cfg.pgdir = &stream->shbuf;
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buf_cfg.num_pages = stream->num_pages;
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buf_cfg.pages = stream->pages;
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ret = xen_front_pgdir_shbuf_alloc(&buf_cfg);
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if (ret < 0)
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goto fail;
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ret = xen_front_pgdir_shbuf_map(&stream->shbuf);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
stream_free(stream);
|
|
dev_err(&front_info->xb_dev->dev,
|
|
"Failed to allocate buffers for stream with index %d\n",
|
|
stream->index);
|
|
return ret;
|
|
}
|
|
|
|
static int alsa_hw_free(struct snd_pcm_substream *substream)
|
|
{
|
|
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
|
int ret;
|
|
|
|
ret = xen_snd_front_stream_close(&stream->evt_pair->req);
|
|
stream_free(stream);
|
|
return ret;
|
|
}
|
|
|
|
static int alsa_prepare(struct snd_pcm_substream *substream)
|
|
{
|
|
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
|
|
|
if (!stream->is_open) {
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
u8 sndif_format;
|
|
int ret;
|
|
|
|
ret = to_sndif_format(runtime->format);
|
|
if (ret < 0) {
|
|
dev_err(&stream->front_info->xb_dev->dev,
|
|
"Unsupported sample format: %d\n",
|
|
runtime->format);
|
|
return ret;
|
|
}
|
|
sndif_format = ret;
|
|
|
|
ret = xen_snd_front_stream_prepare(&stream->evt_pair->req,
|
|
&stream->shbuf,
|
|
sndif_format,
|
|
runtime->channels,
|
|
runtime->rate,
|
|
snd_pcm_lib_buffer_bytes(substream),
|
|
snd_pcm_lib_period_bytes(substream));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
stream->is_open = true;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int alsa_trigger(struct snd_pcm_substream *substream, int cmd)
|
|
{
|
|
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
|
int type;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
type = XENSND_OP_TRIGGER_START;
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
|
type = XENSND_OP_TRIGGER_RESUME;
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
type = XENSND_OP_TRIGGER_STOP;
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
type = XENSND_OP_TRIGGER_PAUSE;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return xen_snd_front_stream_trigger(&stream->evt_pair->req, type);
|
|
}
|
|
|
|
void xen_snd_front_alsa_handle_cur_pos(struct xen_snd_front_evtchnl *evtchnl,
|
|
u64 pos_bytes)
|
|
{
|
|
struct snd_pcm_substream *substream = evtchnl->u.evt.substream;
|
|
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
|
snd_pcm_uframes_t delta, new_hw_ptr, cur_frame;
|
|
|
|
cur_frame = bytes_to_frames(substream->runtime, pos_bytes);
|
|
|
|
delta = cur_frame - stream->be_cur_frame;
|
|
stream->be_cur_frame = cur_frame;
|
|
|
|
new_hw_ptr = (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr);
|
|
new_hw_ptr = (new_hw_ptr + delta) % substream->runtime->buffer_size;
|
|
atomic_set(&stream->hw_ptr, (int)new_hw_ptr);
|
|
|
|
stream->out_frames += delta;
|
|
if (stream->out_frames > substream->runtime->period_size) {
|
|
stream->out_frames %= substream->runtime->period_size;
|
|
snd_pcm_period_elapsed(substream);
|
|
}
|
|
}
|
|
|
|
static snd_pcm_uframes_t alsa_pointer(struct snd_pcm_substream *substream)
|
|
{
|
|
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
|
|
|
return (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr);
|
|
}
|
|
|
|
static int alsa_pb_copy_user(struct snd_pcm_substream *substream,
|
|
int channel, unsigned long pos, void __user *src,
|
|
unsigned long count)
|
|
{
|
|
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
|
|
|
if (unlikely(pos + count > stream->buffer_sz))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(stream->buffer + pos, src, count))
|
|
return -EFAULT;
|
|
|
|
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
|
|
}
|
|
|
|
static int alsa_pb_copy_kernel(struct snd_pcm_substream *substream,
|
|
int channel, unsigned long pos, void *src,
|
|
unsigned long count)
|
|
{
|
|
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
|
|
|
if (unlikely(pos + count > stream->buffer_sz))
|
|
return -EINVAL;
|
|
|
|
memcpy(stream->buffer + pos, src, count);
|
|
|
|
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
|
|
}
|
|
|
|
static int alsa_cap_copy_user(struct snd_pcm_substream *substream,
|
|
int channel, unsigned long pos, void __user *dst,
|
|
unsigned long count)
|
|
{
|
|
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
|
int ret;
|
|
|
|
if (unlikely(pos + count > stream->buffer_sz))
|
|
return -EINVAL;
|
|
|
|
ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return copy_to_user(dst, stream->buffer + pos, count) ?
|
|
-EFAULT : 0;
|
|
}
|
|
|
|
static int alsa_cap_copy_kernel(struct snd_pcm_substream *substream,
|
|
int channel, unsigned long pos, void *dst,
|
|
unsigned long count)
|
|
{
|
|
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
|
int ret;
|
|
|
|
if (unlikely(pos + count > stream->buffer_sz))
|
|
return -EINVAL;
|
|
|
|
ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
memcpy(dst, stream->buffer + pos, count);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int alsa_pb_fill_silence(struct snd_pcm_substream *substream,
|
|
int channel, unsigned long pos,
|
|
unsigned long count)
|
|
{
|
|
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
|
|
|
if (unlikely(pos + count > stream->buffer_sz))
|
|
return -EINVAL;
|
|
|
|
memset(stream->buffer + pos, 0, count);
|
|
|
|
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
|
|
}
|
|
|
|
/*
|
|
* 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 const struct snd_pcm_ops snd_drv_alsa_playback_ops = {
|
|
.open = alsa_open,
|
|
.close = alsa_close,
|
|
.hw_params = alsa_hw_params,
|
|
.hw_free = alsa_hw_free,
|
|
.prepare = alsa_prepare,
|
|
.trigger = alsa_trigger,
|
|
.pointer = alsa_pointer,
|
|
.copy_user = alsa_pb_copy_user,
|
|
.copy_kernel = alsa_pb_copy_kernel,
|
|
.fill_silence = alsa_pb_fill_silence,
|
|
};
|
|
|
|
static const struct snd_pcm_ops snd_drv_alsa_capture_ops = {
|
|
.open = alsa_open,
|
|
.close = alsa_close,
|
|
.hw_params = alsa_hw_params,
|
|
.hw_free = alsa_hw_free,
|
|
.prepare = alsa_prepare,
|
|
.trigger = alsa_trigger,
|
|
.pointer = alsa_pointer,
|
|
.copy_user = alsa_cap_copy_user,
|
|
.copy_kernel = alsa_cap_copy_kernel,
|
|
};
|
|
|
|
static int new_pcm_instance(struct xen_snd_front_card_info *card_info,
|
|
struct xen_front_cfg_pcm_instance *instance_cfg,
|
|
struct xen_snd_front_pcm_instance_info *pcm_instance_info)
|
|
{
|
|
struct snd_pcm *pcm;
|
|
int ret, i;
|
|
|
|
dev_dbg(&card_info->front_info->xb_dev->dev,
|
|
"New PCM device \"%s\" with id %d playback %d capture %d",
|
|
instance_cfg->name,
|
|
instance_cfg->device_id,
|
|
instance_cfg->num_streams_pb,
|
|
instance_cfg->num_streams_cap);
|
|
|
|
pcm_instance_info->card_info = card_info;
|
|
|
|
pcm_instance_info->pcm_hw = instance_cfg->pcm_hw;
|
|
|
|
if (instance_cfg->num_streams_pb) {
|
|
pcm_instance_info->streams_pb =
|
|
devm_kcalloc(&card_info->card->card_dev,
|
|
instance_cfg->num_streams_pb,
|
|
sizeof(struct xen_snd_front_pcm_stream_info),
|
|
GFP_KERNEL);
|
|
if (!pcm_instance_info->streams_pb)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (instance_cfg->num_streams_cap) {
|
|
pcm_instance_info->streams_cap =
|
|
devm_kcalloc(&card_info->card->card_dev,
|
|
instance_cfg->num_streams_cap,
|
|
sizeof(struct xen_snd_front_pcm_stream_info),
|
|
GFP_KERNEL);
|
|
if (!pcm_instance_info->streams_cap)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pcm_instance_info->num_pcm_streams_pb =
|
|
instance_cfg->num_streams_pb;
|
|
pcm_instance_info->num_pcm_streams_cap =
|
|
instance_cfg->num_streams_cap;
|
|
|
|
for (i = 0; i < pcm_instance_info->num_pcm_streams_pb; i++) {
|
|
pcm_instance_info->streams_pb[i].pcm_hw =
|
|
instance_cfg->streams_pb[i].pcm_hw;
|
|
pcm_instance_info->streams_pb[i].index =
|
|
instance_cfg->streams_pb[i].index;
|
|
}
|
|
|
|
for (i = 0; i < pcm_instance_info->num_pcm_streams_cap; i++) {
|
|
pcm_instance_info->streams_cap[i].pcm_hw =
|
|
instance_cfg->streams_cap[i].pcm_hw;
|
|
pcm_instance_info->streams_cap[i].index =
|
|
instance_cfg->streams_cap[i].index;
|
|
}
|
|
|
|
ret = snd_pcm_new(card_info->card, instance_cfg->name,
|
|
instance_cfg->device_id,
|
|
instance_cfg->num_streams_pb,
|
|
instance_cfg->num_streams_cap,
|
|
&pcm);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
pcm->private_data = pcm_instance_info;
|
|
pcm->info_flags = 0;
|
|
/* we want to handle all PCM operations in non-atomic context */
|
|
pcm->nonatomic = true;
|
|
strncpy(pcm->name, "Virtual card PCM", sizeof(pcm->name));
|
|
|
|
if (instance_cfg->num_streams_pb)
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
|
|
&snd_drv_alsa_playback_ops);
|
|
|
|
if (instance_cfg->num_streams_cap)
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
|
|
&snd_drv_alsa_capture_ops);
|
|
|
|
pcm_instance_info->pcm = pcm;
|
|
return 0;
|
|
}
|
|
|
|
int xen_snd_front_alsa_init(struct xen_snd_front_info *front_info)
|
|
{
|
|
struct device *dev = &front_info->xb_dev->dev;
|
|
struct xen_front_cfg_card *cfg = &front_info->cfg;
|
|
struct xen_snd_front_card_info *card_info;
|
|
struct snd_card *card;
|
|
int ret, i;
|
|
|
|
dev_dbg(dev, "Creating virtual sound card\n");
|
|
|
|
ret = snd_card_new(dev, 0, XENSND_DRIVER_NAME, THIS_MODULE,
|
|
sizeof(struct xen_snd_front_card_info), &card);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
card_info = card->private_data;
|
|
card_info->front_info = front_info;
|
|
front_info->card_info = card_info;
|
|
card_info->card = card;
|
|
card_info->pcm_instances =
|
|
devm_kcalloc(dev, cfg->num_pcm_instances,
|
|
sizeof(struct xen_snd_front_pcm_instance_info),
|
|
GFP_KERNEL);
|
|
if (!card_info->pcm_instances) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
card_info->num_pcm_instances = cfg->num_pcm_instances;
|
|
card_info->pcm_hw = cfg->pcm_hw;
|
|
|
|
for (i = 0; i < cfg->num_pcm_instances; i++) {
|
|
ret = new_pcm_instance(card_info, &cfg->pcm_instances[i],
|
|
&card_info->pcm_instances[i]);
|
|
if (ret < 0)
|
|
goto fail;
|
|
}
|
|
|
|
strncpy(card->driver, XENSND_DRIVER_NAME, sizeof(card->driver));
|
|
strncpy(card->shortname, cfg->name_short, sizeof(card->shortname));
|
|
strncpy(card->longname, cfg->name_long, sizeof(card->longname));
|
|
|
|
ret = snd_card_register(card);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
snd_card_free(card);
|
|
return ret;
|
|
}
|
|
|
|
void xen_snd_front_alsa_fini(struct xen_snd_front_info *front_info)
|
|
{
|
|
struct xen_snd_front_card_info *card_info;
|
|
struct snd_card *card;
|
|
|
|
card_info = front_info->card_info;
|
|
if (!card_info)
|
|
return;
|
|
|
|
card = card_info->card;
|
|
if (!card)
|
|
return;
|
|
|
|
dev_dbg(&front_info->xb_dev->dev, "Removing virtual sound card %d\n",
|
|
card->number);
|
|
snd_card_free(card);
|
|
|
|
/* Card_info will be freed when destroying front_info->xb_dev->dev. */
|
|
card_info->card = NULL;
|
|
}
|