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