Quelle  xonar_hdmi.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * helper functions for HDMI models (Xonar HDAV1.3/HDAV1.3 Slim)
 *
 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
 */

#include <linux/pci.h>
#include <linux/delay.h>
#include <sound/asoundef.h>
#include <sound/control.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/tlv.h>
#include "xonar.h"

static void hdmi_write_command(struct oxygen *chip, u8 command,
          unsigned int count, const u8 *params)
{
 unsigned int i;
 u8 checksum;

 oxygen_write_uart(chip, 0xfb);
 oxygen_write_uart(chip, 0xef);
 oxygen_write_uart(chip, command);
 oxygen_write_uart(chip, count);
 for (i = 0; i < count; ++i)
  oxygen_write_uart(chip, params[i]);
 checksum = 0xfb + 0xef + command + count;
 for (i = 0; i < count; ++i)
  checksum += params[i];
 oxygen_write_uart(chip, checksum);
}

static void xonar_hdmi_init_commands(struct oxygen *chip,
         struct xonar_hdmi *hdmi)
{
 u8 param;

 oxygen_reset_uart(chip);
 param = 0;
 hdmi_write_command(chip, 0x61, 1, ¶m);
 param = 1;
 hdmi_write_command(chip, 0x74, 1, ¶m);
 hdmi_write_command(chip, 0x54, 5, hdmi->params);
}

void xonar_hdmi_init(struct oxygen *chip, struct xonar_hdmi *hdmi)
{
 hdmi->params[1] = IEC958_AES3_CON_FS_48000;
 hdmi->params[4] = 1;
 xonar_hdmi_init_commands(chip, hdmi);
}

void xonar_hdmi_cleanup(struct oxygen *chip)
{
 u8 param = 0;

 hdmi_write_command(chip, 0x74, 1, ¶m);
}

void xonar_hdmi_resume(struct oxygen *chip, struct xonar_hdmi *hdmi)
{
 xonar_hdmi_init_commands(chip, hdmi);
}

void xonar_hdmi_pcm_hardware_filter(unsigned int channel,
        struct snd_pcm_hardware *hardware)
{
 if (channel == PCM_MULTICH) {
  hardware->rates = SNDRV_PCM_RATE_44100 |
      SNDRV_PCM_RATE_48000 |
      SNDRV_PCM_RATE_96000 |
      SNDRV_PCM_RATE_192000;
  hardware->rate_min = 44100;
 }
}

void xonar_set_hdmi_params(struct oxygen *chip, struct xonar_hdmi *hdmi,
      struct snd_pcm_hw_params *params)
{
 hdmi->params[0] = 0; /* 1 = non-audio */
 switch (params_rate(params)) {
 case 44100:
  hdmi->params[1] = IEC958_AES3_CON_FS_44100;
  break;
 case 48000:
  hdmi->params[1] = IEC958_AES3_CON_FS_48000;
  break;
 default: /* 96000 */
  hdmi->params[1] = IEC958_AES3_CON_FS_96000;
  break;
 case 192000:
  hdmi->params[1] = IEC958_AES3_CON_FS_192000;
  break;
 }
 hdmi->params[2] = params_channels(params) / 2 - 1;
 if (params_format(params) == SNDRV_PCM_FORMAT_S16_LE)
  hdmi->params[3] = 0;
 else
  hdmi->params[3] = 0xc0;
 hdmi->params[4] = 1; /* ? */
 hdmi_write_command(chip, 0x54, 5, hdmi->params);
}

void xonar_hdmi_uart_input(struct oxygen *chip)
{
 if (chip->uart_input_count >= 2 &&
     chip->uart_input[chip->uart_input_count - 2] == 'O' &&
     chip->uart_input[chip->uart_input_count - 1] == 'K') {
  dev_dbg(chip->card->dev, "message from HDMI chip received:\n");
  print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
         chip->uart_input, chip->uart_input_count);
  chip->uart_input_count = 0;
 }
}