linux/sound/soc/sprd/sprd-mcdt.h

// SPDX-License-Identifier: GPL-2.0

#ifndef __SPRD_MCDT_H
#define __SPRD_MCDT_H

enum sprd_mcdt_channel_type { … };

enum sprd_mcdt_dma_chan { … };

struct sprd_mcdt_chan_callback { … };

/**
 * struct sprd_mcdt_chan - this struct represents a single channel instance
 * @mcdt: the mcdt controller
 * @id: channel id
 * @fifo_phys: channel fifo physical address which is used for DMA transfer
 * @type: channel type
 * @cb: channel fifo interrupt's callback interface to notify the fifo events
 * @dma_enable: indicate if use DMA mode to transfer data
 * @int_enable: indicate if use interrupt mode to notify users to read or
 * write data manually
 * @list: used to link into the global list
 *
 * Note: users should not modify any members of this structure.
 */
struct sprd_mcdt_chan { … };

#if IS_ENABLED(CONFIG_SND_SOC_SPRD_MCDT)
struct sprd_mcdt_chan *sprd_mcdt_request_chan(u8 channel,
					      enum sprd_mcdt_channel_type type);
void sprd_mcdt_free_chan(struct sprd_mcdt_chan *chan);

int sprd_mcdt_chan_write(struct sprd_mcdt_chan *chan, char *tx_buf, u32 size);
int sprd_mcdt_chan_read(struct sprd_mcdt_chan *chan, char *rx_buf, u32 size);
int sprd_mcdt_chan_int_enable(struct sprd_mcdt_chan *chan, u32 water_mark,
			      struct sprd_mcdt_chan_callback *cb);
void sprd_mcdt_chan_int_disable(struct sprd_mcdt_chan *chan);

int sprd_mcdt_chan_dma_enable(struct sprd_mcdt_chan *chan,
			      enum sprd_mcdt_dma_chan dma_chan, u32 water_mark);
void sprd_mcdt_chan_dma_disable(struct sprd_mcdt_chan *chan);

#else

struct sprd_mcdt_chan *sprd_mcdt_request_chan(u8 channel,
					      enum sprd_mcdt_channel_type type)
{
	return NULL;
}

void sprd_mcdt_free_chan(struct sprd_mcdt_chan *chan)
{ }

int sprd_mcdt_chan_write(struct sprd_mcdt_chan *chan, char *tx_buf, u32 size)
{
	return -EINVAL;
}

int sprd_mcdt_chan_read(struct sprd_mcdt_chan *chan, char *rx_buf, u32 size)
{
	return 0;
}

int sprd_mcdt_chan_int_enable(struct sprd_mcdt_chan *chan, u32 water_mark,
			      struct sprd_mcdt_chan_callback *cb)
{
	return -EINVAL;
}

void sprd_mcdt_chan_int_disable(struct sprd_mcdt_chan *chan)
{ }

int sprd_mcdt_chan_dma_enable(struct sprd_mcdt_chan *chan,
			      enum sprd_mcdt_dma_chan dma_chan, u32 water_mark)
{
	return -EINVAL;
}

void sprd_mcdt_chan_dma_disable(struct sprd_mcdt_chan *chan)
{ }

#endif

#endif /* __SPRD_MCDT_H */