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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/sound/pci/oxygen/xonar_hdmi.c
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// SPDX-License-Identifier: GPL-2.0-only

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/*

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 * helper functions for HDMI models (Xonar HDAV1.3/HDAV1.3 Slim)

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 *

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 * Copyright (c) Clemens Ladisch <[email protected]>

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 */

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#include <linux/pci.h>

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#include <linux/delay.h>

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#include <sound/asoundef.h>

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#include <sound/control.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 <sound/tlv.h>

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#include "xonar.h"

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static void hdmi_write_command(struct oxygen *chip, u8 command,

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			       unsigned int count, const u8 *params)

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{

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	unsigned int i;

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	u8 checksum;

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	oxygen_write_uart(chip, 0xfb);

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	oxygen_write_uart(chip, 0xef);

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	oxygen_write_uart(chip, command);

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	oxygen_write_uart(chip, count);

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	for (i = 0; i < count; ++i)

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		oxygen_write_uart(chip, params[i]);

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	checksum = 0xfb + 0xef + command + count;

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	for (i = 0; i < count; ++i)

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		checksum += params[i];

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	oxygen_write_uart(chip, checksum);

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}

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static void xonar_hdmi_init_commands(struct oxygen *chip,

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				     struct xonar_hdmi *hdmi)

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{

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	u8 param;

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	oxygen_reset_uart(chip);

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	param = 0;

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	hdmi_write_command(chip, 0x61, 1, &param);

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	param = 1;

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	hdmi_write_command(chip, 0x74, 1, &param);

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	hdmi_write_command(chip, 0x54, 5, hdmi->params);

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}

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void xonar_hdmi_init(struct oxygen *chip, struct xonar_hdmi *hdmi)

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{

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	hdmi->params[1] = IEC958_AES3_CON_FS_48000;

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	hdmi->params[4] = 1;

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	xonar_hdmi_init_commands(chip, hdmi);

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}

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void xonar_hdmi_cleanup(struct oxygen *chip)

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{

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	u8 param = 0;

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	hdmi_write_command(chip, 0x74, 1, &param);

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}

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void xonar_hdmi_resume(struct oxygen *chip, struct xonar_hdmi *hdmi)

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{

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	xonar_hdmi_init_commands(chip, hdmi);

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}

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void xonar_hdmi_pcm_hardware_filter(unsigned int channel,

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				    struct snd_pcm_hardware *hardware)

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{

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	if (channel == PCM_MULTICH) {

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		hardware->rates = SNDRV_PCM_RATE_44100 |

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				  SNDRV_PCM_RATE_48000 |

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				  SNDRV_PCM_RATE_96000 |

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				  SNDRV_PCM_RATE_192000;

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		hardware->rate_min = 44100;

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	}

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}

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void xonar_set_hdmi_params(struct oxygen *chip, struct xonar_hdmi *hdmi,

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			   struct snd_pcm_hw_params *params)

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{

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	hdmi->params[0] = 0; /* 1 = non-audio */

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	switch (params_rate(params)) {

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	case 44100:

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		hdmi->params[1] = IEC958_AES3_CON_FS_44100;

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		break;

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	case 48000:

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		hdmi->params[1] = IEC958_AES3_CON_FS_48000;

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		break;

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	default: /* 96000 */

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		hdmi->params[1] = IEC958_AES3_CON_FS_96000;

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		break;

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	case 192000:

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		hdmi->params[1] = IEC958_AES3_CON_FS_192000;

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		break;

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	}

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	hdmi->params[2] = params_channels(params) / 2 - 1;

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	if (params_format(params) == SNDRV_PCM_FORMAT_S16_LE)

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		hdmi->params[3] = 0;

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	else

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		hdmi->params[3] = 0xc0;

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	hdmi->params[4] = 1; /* ? */

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	hdmi_write_command(chip, 0x54, 5, hdmi->params);

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}

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void xonar_hdmi_uart_input(struct oxygen *chip)

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{

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	if (chip->uart_input_count >= 2 &&

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	    chip->uart_input[chip->uart_input_count - 2] == 'O' &&

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	    chip->uart_input[chip->uart_input_count - 1] == 'K') {

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		dev_dbg(chip->card->dev, "message from HDMI chip received:\n");

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		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,

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				     chip->uart_input, chip->uart_input_count);

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		chip->uart_input_count = 0;

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	}

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}

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