pdaudiocf_pcm.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Driver for Sound Core PDAudioCF soundcards
 *
 * PCM part
 *
 * Copyright (c) 2003 by Jaroslav Kysela <[email protected]>
 */

#include <linux/delay.h>
#include <sound/core.h>
#include <sound/asoundef.h>
#include "pdaudiocf.h"


/*
 * clear the SRAM contents
 */
static int pdacf_pcm_clear_sram(struct snd_pdacf *chip)
{
	int max_loop = 64 * 1024;

	while (inw(chip->port + PDAUDIOCF_REG_RDP) != inw(chip->port + PDAUDIOCF_REG_WDP)) {
		if (max_loop-- < 0)
			return -EIO;
		inw(chip->port + PDAUDIOCF_REG_MD);
	}
	return 0;
}

/*
 * pdacf_pcm_trigger - trigger callback for capture
 */
static int pdacf_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
{
	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
	struct snd_pcm_runtime *runtime = subs->runtime;
	int inc, ret = 0, rate;
	unsigned short mask, val, tmp;

	if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
		return -EBUSY;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		chip->pcm_hwptr = 0;
		chip->pcm_tdone = 0;
		fallthrough;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	case SNDRV_PCM_TRIGGER_RESUME:
		mask = 0;
		val = PDAUDIOCF_RECORD;
		inc = 1;
		rate = snd_ak4117_check_rate_and_errors(chip->ak4117, AK4117_CHECK_NO_STAT|AK4117_CHECK_NO_RATE);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		mask = PDAUDIOCF_RECORD;
		val = 0;
		inc = -1;
		rate = 0;
		break;
	default:
		return -EINVAL;
	}
	scoped_guard(mutex, &chip->reg_lock) {
		chip->pcm_running += inc;
		tmp = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
		if (chip->pcm_running) {
			if ((chip->ak4117->rcs0 & AK4117_UNLCK) || runtime->rate != rate) {
				chip->pcm_running -= inc;
				ret = -EIO;
				break;
			}
		}
		tmp &= ~mask;
		tmp |= val;
		pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, tmp);
	}
	snd_ak4117_check_rate_and_errors(chip->ak4117, AK4117_CHECK_NO_RATE);
	return ret;
}

/*
 * pdacf_pcm_prepare - prepare callback for playback and capture
 */
static int pdacf_pcm_prepare(struct snd_pcm_substream *subs)
{
	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
	struct snd_pcm_runtime *runtime = subs->runtime;
	u16 val, nval, aval;

	if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
		return -EBUSY;

	chip->pcm_channels = runtime->channels;

	chip->pcm_little = snd_pcm_format_little_endian(runtime->format) > 0;
#ifdef SNDRV_LITTLE_ENDIAN
	chip->pcm_swab = snd_pcm_format_big_endian(runtime->format) > 0;
#else
	chip->pcm_swab = chip->pcm_little;
#endif

	if (snd_pcm_format_unsigned(runtime->format))
		chip->pcm_xor = 0x80008000;

	if (pdacf_pcm_clear_sram(chip) < 0)
		return -EIO;
	
	val = nval = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
	nval &= ~(PDAUDIOCF_DATAFMT0|PDAUDIOCF_DATAFMT1);
	switch (runtime->format) {
	case SNDRV_PCM_FORMAT_S16_LE:
	case SNDRV_PCM_FORMAT_S16_BE:
		break;
	default: /* 24-bit */
		nval |= PDAUDIOCF_DATAFMT0 | PDAUDIOCF_DATAFMT1;
		break;
	}
	aval = 0;
	chip->pcm_sample = 4;
	switch (runtime->format) {
	case SNDRV_PCM_FORMAT_S16_LE:
	case SNDRV_PCM_FORMAT_S16_BE:
		aval = AK4117_DIF_16R;
		chip->pcm_frame = 2;
		chip->pcm_sample = 2;
		break;
	case SNDRV_PCM_FORMAT_S24_3LE:
	case SNDRV_PCM_FORMAT_S24_3BE:
		chip->pcm_sample = 3;
		fallthrough;
	default: /* 24-bit */
		aval = AK4117_DIF_24R;
		chip->pcm_frame = 3;
		chip->pcm_xor &= 0xffff0000;
		break;
	}

	if (val != nval) {
		snd_ak4117_reg_write(chip->ak4117, AK4117_REG_IO, AK4117_DIF2|AK4117_DIF1|AK4117_DIF0, aval);
		pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, nval);
	}

	val = pdacf_reg_read(chip,  PDAUDIOCF_REG_IER);
	val &= ~(PDAUDIOCF_IRQLVLEN1);
	val |= PDAUDIOCF_IRQLVLEN0;
	pdacf_reg_write(chip, PDAUDIOCF_REG_IER, val);

	chip->pcm_size = runtime->buffer_size;
	chip->pcm_period = runtime->period_size;
	chip->pcm_area = runtime->dma_area;

	return 0;
}


/*
 * capture hw information
 */

static const struct snd_pcm_hardware pdacf_pcm_capture_hw = {
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
				 SNDRV_PCM_INFO_MMAP_VALID |
				 SNDRV_PCM_INFO_BATCH),
	.formats =		SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
				SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |
				SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE,
	.rates =		SNDRV_PCM_RATE_32000 |
				SNDRV_PCM_RATE_44100 |
				SNDRV_PCM_RATE_48000 |
				SNDRV_PCM_RATE_88200 |
				SNDRV_PCM_RATE_96000 |
				SNDRV_PCM_RATE_176400 |
				SNDRV_PCM_RATE_192000,
	.rate_min =		32000,
	.rate_max =		192000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(512*1024),
	.period_bytes_min =	8*1024,
	.period_bytes_max =	(64*1024),
	.periods_min =		2,
	.periods_max =		128,
	.fifo_size =		0,
};


/*
 * pdacf_pcm_capture_open - open callback for capture
 */
static int pdacf_pcm_capture_open(struct snd_pcm_substream *subs)
{
	struct snd_pcm_runtime *runtime = subs->runtime;
	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);

	if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
		return -EBUSY;

	runtime->hw = pdacf_pcm_capture_hw;
	runtime->private_data = chip;
	chip->pcm_substream = subs;

	return 0;
}

/*
 * pdacf_pcm_capture_close - close callback for capture
 */
static int pdacf_pcm_capture_close(struct snd_pcm_substream *subs)
{
	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);

	if (!chip)
		return -EINVAL;
	pdacf_reinit(chip, 0);
	chip->pcm_substream = NULL;
	return 0;
}


/*
 * pdacf_pcm_capture_pointer - pointer callback for capture
 */
static snd_pcm_uframes_t pdacf_pcm_capture_pointer(struct snd_pcm_substream *subs)
{
	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
	return chip->pcm_hwptr;
}

/*
 * operators for PCM capture
 */
static const struct snd_pcm_ops pdacf_pcm_capture_ops = {
	.open =		pdacf_pcm_capture_open,
	.close =	pdacf_pcm_capture_close,
	.prepare =	pdacf_pcm_prepare,
	.trigger =	pdacf_pcm_trigger,
	.pointer =	pdacf_pcm_capture_pointer,
};


/*
 * snd_pdacf_pcm_new - create and initialize a pcm
 */
int snd_pdacf_pcm_new(struct snd_pdacf *chip)
{
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(chip->card, "PDAudioCF", 0, 0, 1, &pcm);
	if (err < 0)
		return err;
		
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pdacf_pcm_capture_ops);
	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL,
				       0, 0);

	pcm->private_data = chip;
	pcm->info_flags = 0;
	pcm->nonatomic = true;
	strscpy(pcm->name, chip->card->shortname);
	chip->pcm = pcm;
	
	err = snd_ak4117_build(chip->ak4117, pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream);
	if (err < 0)
		return err;

	return 0;
}