linux/drivers/media/pci/cx23885/cx23885-alsa.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 *  Support for CX23885 analog audio capture
 *
 *    (c) 2008 Mijhail Moreyra <[email protected]>
 *    Adapted from cx88-alsa.c
 *    (c) 2009 Steven Toth <[email protected]>
 */

#include "cx23885.h"
#include "cx23885-reg.h"

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
#include <linux/dma-mapping.h>
#include <linux/pci.h>

#include <asm/delay.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/control.h>
#include <sound/initval.h>

#include <sound/tlv.h>

#define AUDIO_SRAM_CHANNEL …

#define dprintk(level, fmt, arg...) …

/****************************************************************************
			Module global static vars
 ****************************************************************************/

static unsigned int disable_analog_audio;
module_param(disable_analog_audio, int, 0644);
MODULE_PARM_DESC(…) …;

static unsigned int audio_debug;
module_param(audio_debug, int, 0644);
MODULE_PARM_DESC(…) …;

/****************************************************************************
			Board specific functions
 ****************************************************************************/

/* Constants taken from cx88-reg.h */
#define AUD_INT_DN_RISCI1 …
#define AUD_INT_UP_RISCI1 …
#define AUD_INT_RDS_DN_RISCI1 …
#define AUD_INT_DN_RISCI2 …
#define AUD_INT_UP_RISCI2 …
#define AUD_INT_RDS_DN_RISCI2 …
#define AUD_INT_DN_SYNC …
#define AUD_INT_UP_SYNC …
#define AUD_INT_RDS_DN_SYNC …
#define AUD_INT_OPC_ERR …
#define AUD_INT_BER_IRQ …
#define AUD_INT_MCHG_IRQ …
#define GP_COUNT_CONTROL_RESET …

static int cx23885_alsa_dma_init(struct cx23885_audio_dev *chip,
				 unsigned long nr_pages)
{ … }

static int cx23885_alsa_dma_map(struct cx23885_audio_dev *dev)
{ … }

static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev)
{ … }

static int cx23885_alsa_dma_free(struct cx23885_audio_buffer *buf)
{ … }

/*
 * BOARD Specific: Sets audio DMA
 */

static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip)
{ … }

/*
 * BOARD Specific: Resets audio DMA
 */
static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip)
{ … }

/*
 * BOARD Specific: Handles audio IRQ
 */
int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask)
{ … }

static int dsp_buffer_free(struct cx23885_audio_dev *chip)
{ … }

/****************************************************************************
				ALSA PCM Interface
 ****************************************************************************/

/*
 * Digital hardware definition
 */
#define DEFAULT_FIFO_SIZE …

static const struct snd_pcm_hardware snd_cx23885_digital_hw = …;

/*
 * audio pcm capture open callback
 */
static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream)
{ … }

/*
 * audio close callback
 */
static int snd_cx23885_close(struct snd_pcm_substream *substream)
{ … }


/*
 * hw_params callback
 */
static int snd_cx23885_hw_params(struct snd_pcm_substream *substream,
			      struct snd_pcm_hw_params *hw_params)
{ … }

/*
 * hw free callback
 */
static int snd_cx23885_hw_free(struct snd_pcm_substream *substream)
{ … }

/*
 * prepare callback
 */
static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
{ … }

/*
 * trigger callback
 */
static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream,
	int cmd)
{ … }

/*
 * pointer callback
 */
static snd_pcm_uframes_t snd_cx23885_pointer(
	struct snd_pcm_substream *substream)
{ … }

/*
 * page callback (needed for mmap)
 */
static struct page *snd_cx23885_page(struct snd_pcm_substream *substream,
				unsigned long offset)
{ … }

/*
 * operators
 */
static const struct snd_pcm_ops snd_cx23885_pcm_ops = …;

/*
 * create a PCM device
 */
static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device,
	char *name)
{ … }

/****************************************************************************
			Basic Flow for Sound Devices
 ****************************************************************************/

/*
 * Alsa Constructor - Component probe
 */

struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev)
{ … }

/*
 * ALSA destructor
 */
void cx23885_audio_unregister(struct cx23885_dev *dev)
{ … }