linux/sound/hda/hdac_bus.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * HD-audio core bus driver
 */

#include <linux/init.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/export.h>
#include <sound/hdaudio.h>
#include "local.h"
#include "trace.h"

static void snd_hdac_bus_process_unsol_events(struct work_struct *work);

static const struct hdac_bus_ops default_ops = …;

/**
 * snd_hdac_bus_init - initialize a HD-audio bas bus
 * @bus: the pointer to bus object
 * @dev: device pointer
 * @ops: bus verb operators
 *
 * Returns 0 if successful, or a negative error code.
 */
int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
		      const struct hdac_bus_ops *ops)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * snd_hdac_bus_exit - clean up a HD-audio bas bus
 * @bus: the pointer to bus object
 */
void snd_hdac_bus_exit(struct hdac_bus *bus)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus
 * @bus: bus object
 * @addr: the HDAC device address
 * @cmd: HD-audio encoded verb
 * @res: pointer to store the response, NULL if performing asynchronously
 *
 * Returns 0 if successful, or a negative error code.
 */
int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
			   unsigned int cmd, unsigned int *res)
{ … }

/**
 * snd_hdac_bus_exec_verb_unlocked - unlocked version
 * @bus: bus object
 * @addr: the HDAC device address
 * @cmd: HD-audio encoded verb
 * @res: pointer to store the response, NULL if performing asynchronously
 *
 * Returns 0 if successful, or a negative error code.
 */
int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
				    unsigned int cmd, unsigned int *res)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * snd_hdac_bus_queue_event - add an unsolicited event to queue
 * @bus: the BUS
 * @res: unsolicited event (lower 32bit of RIRB entry)
 * @res_ex: codec addr and flags (upper 32bit or RIRB entry)
 *
 * Adds the given event to the queue.  The events are processed in
 * the workqueue asynchronously.  Call this function in the interrupt
 * hanlder when RIRB receives an unsolicited event.
 */
void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex)
{ … }

/*
 * process queued unsolicited events
 */
static void snd_hdac_bus_process_unsol_events(struct work_struct *work)
{ … }

/**
 * snd_hdac_bus_add_device - Add a codec to bus
 * @bus: HDA core bus
 * @codec: HDA core device to add
 *
 * Adds the given codec to the list in the bus.  The caddr_tbl array
 * and codec_powered bits are updated, as well.
 * Returns zero if success, or a negative error code.
 */
int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
{ … }

/**
 * snd_hdac_bus_remove_device - Remove a codec from bus
 * @bus: HDA core bus
 * @codec: HDA core device to remove
 */
void snd_hdac_bus_remove_device(struct hdac_bus *bus,
				struct hdac_device *codec)
{ … }

#ifdef CONFIG_SND_HDA_ALIGNED_MMIO
/* Helpers for aligned read/write of mmio space, for Tegra */
unsigned int snd_hdac_aligned_read(void __iomem *addr, unsigned int mask)
{
	void __iomem *aligned_addr =
		(void __iomem *)((unsigned long)(addr) & ~0x3);
	unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
	unsigned int v;

	v = readl(aligned_addr);
	return (v >> shift) & mask;
}
EXPORT_SYMBOL_GPL(snd_hdac_aligned_read);

void snd_hdac_aligned_write(unsigned int val, void __iomem *addr,
			    unsigned int mask)
{
	void __iomem *aligned_addr =
		(void __iomem *)((unsigned long)(addr) & ~0x3);
	unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
	unsigned int v;

	v = readl(aligned_addr);
	v &= ~(mask << shift);
	v |= val << shift;
	writel(v, aligned_addr);
}
EXPORT_SYMBOL_GPL(snd_hdac_aligned_write);
#endif /* CONFIG_SND_HDA_ALIGNED_MMIO */

void snd_hdac_codec_link_up(struct hdac_device *codec)
{ … }
EXPORT_SYMBOL_GPL(…);

void snd_hdac_codec_link_down(struct hdac_device *codec)
{ … }
EXPORT_SYMBOL_GPL(…);