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872 lines
22 KiB
872 lines
22 KiB
// 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 <[email protected]> |
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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); |
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if (ret < 0) |
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goto fail; |
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return 0; |
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fail: |
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stream_free(stream); |
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dev_err(&front_info->xb_dev->dev, |
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"Failed to allocate buffers for stream with index %d\n", |
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stream->index); |
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return ret; |
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} |
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static int alsa_hw_free(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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int ret; |
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ret = xen_snd_front_stream_close(&stream->evt_pair->req); |
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stream_free(stream); |
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return ret; |
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} |
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static int alsa_prepare(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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if (!stream->is_open) { |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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u8 sndif_format; |
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int ret; |
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ret = to_sndif_format(runtime->format); |
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if (ret < 0) { |
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dev_err(&stream->front_info->xb_dev->dev, |
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"Unsupported sample format: %d\n", |
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runtime->format); |
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return ret; |
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} |
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sndif_format = ret; |
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ret = xen_snd_front_stream_prepare(&stream->evt_pair->req, |
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&stream->shbuf, |
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sndif_format, |
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runtime->channels, |
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runtime->rate, |
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snd_pcm_lib_buffer_bytes(substream), |
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snd_pcm_lib_period_bytes(substream)); |
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if (ret < 0) |
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return ret; |
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stream->is_open = true; |
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} |
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return 0; |
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} |
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static int alsa_trigger(struct snd_pcm_substream *substream, int cmd) |
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{ |
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struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); |
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int type; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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type = XENSND_OP_TRIGGER_START; |
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break; |
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case SNDRV_PCM_TRIGGER_RESUME: |
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type = XENSND_OP_TRIGGER_RESUME; |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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type = XENSND_OP_TRIGGER_STOP; |
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break; |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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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; |
|
}
|
|
|