Quelle  proc.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 */

#include <linux/init.h>
#include <linux/usb.h>

#include <sound/core.h>
#include <sound/info.h>
#include <sound/pcm.h>

#include "usbaudio.h"
#include "helper.h"
#include "card.h"
#include "endpoint.h"
#include "proc.h"

/* convert our full speed USB rate into sampling rate in Hz */
static inline unsigned get_full_speed_hz(unsigned int usb_rate)
{
 return (usb_rate * 125 + (1 << 12)) >> 13;
}

/* convert our high speed USB rate into sampling rate in Hz */
static inline unsigned get_high_speed_hz(unsigned int usb_rate)
{
 return (usb_rate * 125 + (1 << 9)) >> 10;
}

/*
 * common proc files to show the usb device info
 */
static void proc_audio_usbbus_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
 struct snd_usb_audio *chip = entry->private_data;
 if (!atomic_read(&chip->shutdown))
  snd_iprintf(buffer, "%03d/%03d\n", chip->dev->bus->busnum, chip->dev->devnum);
}

static void proc_audio_usbid_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
 struct snd_usb_audio *chip = entry->private_data;
 if (!atomic_read(&chip->shutdown))
  snd_iprintf(buffer, "%04x:%04x\n", 
       USB_ID_VENDOR(chip->usb_id),
       USB_ID_PRODUCT(chip->usb_id));
}

void snd_usb_audio_create_proc(struct snd_usb_audio *chip)
{
 snd_card_ro_proc_new(chip->card, "usbbus", chip,
        proc_audio_usbbus_read);
 snd_card_ro_proc_new(chip->card, "usbid", chip,
        proc_audio_usbid_read);
}

static const char * const channel_labels[] = {
 [SNDRV_CHMAP_NA] = "N/A",
 [SNDRV_CHMAP_MONO] = "MONO",
 [SNDRV_CHMAP_FL] = "FL",
 [SNDRV_CHMAP_FR] = "FR",
 [SNDRV_CHMAP_FC] = "FC",
 [SNDRV_CHMAP_LFE] = "LFE",
 [SNDRV_CHMAP_RL] = "RL",
 [SNDRV_CHMAP_RR] = "RR",
 [SNDRV_CHMAP_FLC] = "FLC",
 [SNDRV_CHMAP_FRC] = "FRC",
 [SNDRV_CHMAP_RC] = "RC",
 [SNDRV_CHMAP_SL] = "SL",
 [SNDRV_CHMAP_SR] = "SR",
 [SNDRV_CHMAP_TC] = "TC",
 [SNDRV_CHMAP_TFL] = "TFL",
 [SNDRV_CHMAP_TFC] = "TFC",
 [SNDRV_CHMAP_TFR] = "TFR",
 [SNDRV_CHMAP_TRL] = "TRL",
 [SNDRV_CHMAP_TRC] = "TRC",
 [SNDRV_CHMAP_TRR] = "TRR",
 [SNDRV_CHMAP_TFLC] = "TFLC",
 [SNDRV_CHMAP_TFRC] = "TFRC",
 [SNDRV_CHMAP_LLFE] = "LLFE",
 [SNDRV_CHMAP_RLFE] = "RLFE",
 [SNDRV_CHMAP_TSL] = "TSL",
 [SNDRV_CHMAP_TSR] = "TSR",
 [SNDRV_CHMAP_BC] = "BC",
 [SNDRV_CHMAP_RLC] = "RLC",
 [SNDRV_CHMAP_RRC] = "RRC",
};

/*
 * proc interface for list the supported pcm formats
 */
static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
{
 struct audioformat *fp;
 static const char * const sync_types[4] = {
  "NONE", "ASYNC", "ADAPTIVE", "SYNC"
 };

 list_for_each_entry(fp, &subs->fmt_list, list) {
  snd_pcm_format_t fmt;

  snd_iprintf(buffer, " Interface %d\n", fp->iface);
  snd_iprintf(buffer, " Altset %d\n", fp->altsetting);
  snd_iprintf(buffer, " Format:");
  pcm_for_each_format(fmt)
   if (fp->formats & pcm_format_to_bits(fmt))
    snd_iprintf(buffer, " %s",
         snd_pcm_format_name(fmt));
  snd_iprintf(buffer, "\n");
  snd_iprintf(buffer, " Channels: %d\n", fp->channels);
  snd_iprintf(buffer, " Endpoint: 0x%02x (%d %s) (%s)\n",
       fp->endpoint,
       fp->endpoint & USB_ENDPOINT_NUMBER_MASK,
       fp->endpoint & USB_DIR_IN ? "IN" : "OUT",
       sync_types[(fp->ep_attr & USB_ENDPOINT_SYNCTYPE) >> 2]);
  if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) {
   snd_iprintf(buffer, " Rates: %d - %d (continuous)\n",
        fp->rate_min, fp->rate_max);
  } else {
   unsigned int i;
   snd_iprintf(buffer, " Rates: ");
   for (i = 0; i < fp->nr_rates; i++) {
    if (i > 0)
     snd_iprintf(buffer, ", ");
    snd_iprintf(buffer, "%d", fp->rate_table[i]);
   }
   snd_iprintf(buffer, "\n");
  }
  if (subs->speed != USB_SPEED_FULL)
   snd_iprintf(buffer, " Data packet interval: %d us\n",
        125 * (1 << fp->datainterval));
  snd_iprintf(buffer, " Bits: %d\n", fp->fmt_bits);

  if (fp->dsd_raw)
   snd_iprintf(buffer, " DSD raw: DOP=%d, bitrev=%d\n",
        fp->dsd_dop, fp->dsd_bitrev);

  if (fp->chmap) {
   const struct snd_pcm_chmap_elem *map = fp->chmap;
   int c;

   snd_iprintf(buffer, " Channel map:");
   for (c = 0; c < map->channels; c++) {
    if (map->map[c] >= ARRAY_SIZE(channel_labels) ||
        !channel_labels[map->map[c]])
     snd_iprintf(buffer, " --");
    else
     snd_iprintf(buffer, " %s",
          channel_labels[map->map[c]]);
   }
   snd_iprintf(buffer, "\n");
  }

  if (fp->sync_ep) {
   snd_iprintf(buffer, " Sync Endpoint: 0x%02x (%d %s)\n",
        fp->sync_ep,
        fp->sync_ep & USB_ENDPOINT_NUMBER_MASK,
        fp->sync_ep & USB_DIR_IN ? "IN" : "OUT");
   snd_iprintf(buffer, " Sync EP Interface: %d\n",
        fp->sync_iface);
   snd_iprintf(buffer, " Sync EP Altset: %d\n",
        fp->sync_altsetting);
   snd_iprintf(buffer, " Implicit Feedback Mode: %s\n",
        fp->implicit_fb ? "Yes" : "No");
  }

  // snd_iprintf(buffer, "    Max Packet Size = %d\n", fp->maxpacksize);
  // snd_iprintf(buffer, "    EP Attribute = %#x\n", fp->attributes);
 }
}

static void proc_dump_ep_status(struct snd_usb_substream *subs,
    struct snd_usb_endpoint *data_ep,
    struct snd_usb_endpoint *sync_ep,
    struct snd_info_buffer *buffer)
{
 if (!data_ep)
  return;
 snd_iprintf(buffer, " Packet Size = %d\n", data_ep->curpacksize);
 snd_iprintf(buffer, " Momentary freq = %u Hz (%#x.%04x)\n",
      subs->speed == USB_SPEED_FULL
      ? get_full_speed_hz(data_ep->freqm)
      : get_high_speed_hz(data_ep->freqm),
      data_ep->freqm >> 16, data_ep->freqm & 0xffff);
 if (sync_ep && data_ep->freqshift != INT_MIN) {
  int res = 16 - data_ep->freqshift;
  snd_iprintf(buffer, " Feedback Format = %d.%d\n",
       (sync_ep->syncmaxsize > 3 ? 32 : 24) - res, res);
 }
}

static void proc_dump_substream_status(struct snd_usb_audio *chip,
           struct snd_usb_substream *subs,
           struct snd_info_buffer *buffer)
{
 mutex_lock(&chip->mutex);
 if (subs->running) {
  snd_iprintf(buffer, " Status: Running\n");
  if (subs->cur_audiofmt) {
   snd_iprintf(buffer, " Interface = %d\n", subs->cur_audiofmt->iface);
   snd_iprintf(buffer, " Altset = %d\n", subs->cur_audiofmt->altsetting);
  }
  proc_dump_ep_status(subs, subs->data_endpoint, subs->sync_endpoint, buffer);
 } else {
  snd_iprintf(buffer, " Status: Stop\n");
 }
 mutex_unlock(&chip->mutex);
}

static void proc_pcm_format_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
 struct snd_usb_stream *stream = entry->private_data;
 struct snd_usb_audio *chip = stream->chip;

 snd_iprintf(buffer, "%s : %s\n", chip->card->longname, stream->pcm->name);

 if (stream->substream[SNDRV_PCM_STREAM_PLAYBACK].num_formats) {
  snd_iprintf(buffer, "\nPlayback:\n");
  proc_dump_substream_status(chip, &stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
  proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
 }
 if (stream->substream[SNDRV_PCM_STREAM_CAPTURE].num_formats) {
  snd_iprintf(buffer, "\nCapture:\n");
  proc_dump_substream_status(chip, &stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
  proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
 }
}

void snd_usb_proc_pcm_format_add(struct snd_usb_stream *stream)
{
 char name[32];
 struct snd_card *card = stream->chip->card;

 scnprintf(name, sizeof(name), "stream%d", stream->pcm_index);
 snd_card_ro_proc_new(card, name, stream, proc_pcm_format_read);
}