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xonar_hdmi.c

/*
 * helper functions for HDMI models (Xonar HDAV1.3/HDAV1.3 Slim)
 *
 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
 *
 *
 *  This driver is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License, version 2.
 *
 *  This driver is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this driver; if not, see <http://www.gnu.org/licenses/>.
 */

#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, &param);
      param = 1;
      hdmi_write_command(chip, 0x74, 1, &param);
      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, &param);
}

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') {
            printk(KERN_DEBUG "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;
      }
}

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