202 lines
6.3 KiB
C
202 lines
6.3 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0-only */
|
||
|
|
/*
|
||
|
|
* soundbus generic definitions
|
||
|
|
*
|
||
|
|
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
|
||
|
|
*/
|
||
|
|
#ifndef __SOUNDBUS_H
|
||
|
|
#define __SOUNDBUS_H
|
||
|
|
|
||
|
|
#include <linux/of_device.h>
|
||
|
|
#include <sound/pcm.h>
|
||
|
|
#include <linux/list.h>
|
||
|
|
|
||
|
|
|
||
|
|
/* When switching from master to slave or the other way around,
|
||
|
|
* you don't want to have the codec chip acting as clock source
|
||
|
|
* while the bus still is.
|
||
|
|
* More importantly, while switch from slave to master, you need
|
||
|
|
* to turn off the chip's master function first, but then there's
|
||
|
|
* no clock for a while and other chips might reset, so we notify
|
||
|
|
* their drivers after having switched.
|
||
|
|
* The constants here are codec-point of view, so when we switch
|
||
|
|
* the soundbus to master we tell the codec we're going to switch
|
||
|
|
* and give it CLOCK_SWITCH_PREPARE_SLAVE!
|
||
|
|
*/
|
||
|
|
enum clock_switch {
|
||
|
|
CLOCK_SWITCH_PREPARE_SLAVE,
|
||
|
|
CLOCK_SWITCH_PREPARE_MASTER,
|
||
|
|
CLOCK_SWITCH_SLAVE,
|
||
|
|
CLOCK_SWITCH_MASTER,
|
||
|
|
CLOCK_SWITCH_NOTIFY,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* information on a transfer the codec can take */
|
||
|
|
struct transfer_info {
|
||
|
|
u64 formats; /* SNDRV_PCM_FMTBIT_* */
|
||
|
|
unsigned int rates; /* SNDRV_PCM_RATE_* */
|
||
|
|
/* flags */
|
||
|
|
u32 transfer_in:1, /* input = 1, output = 0 */
|
||
|
|
must_be_clock_source:1;
|
||
|
|
/* for codecs to distinguish among their TIs */
|
||
|
|
int tag;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct codec_info_item {
|
||
|
|
struct codec_info *codec;
|
||
|
|
void *codec_data;
|
||
|
|
struct soundbus_dev *sdev;
|
||
|
|
/* internal, to be used by the soundbus provider */
|
||
|
|
struct list_head list;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* for prepare, where the codecs need to know
|
||
|
|
* what we're going to drive the bus with */
|
||
|
|
struct bus_info {
|
||
|
|
/* see below */
|
||
|
|
int sysclock_factor;
|
||
|
|
int bus_factor;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* information on the codec itself, plus function pointers */
|
||
|
|
struct codec_info {
|
||
|
|
/* the module this lives in */
|
||
|
|
struct module *owner;
|
||
|
|
|
||
|
|
/* supported transfer possibilities, array terminated by
|
||
|
|
* formats or rates being 0. */
|
||
|
|
struct transfer_info *transfers;
|
||
|
|
|
||
|
|
/* Master clock speed factor
|
||
|
|
* to be used (master clock speed = sysclock_factor * sampling freq)
|
||
|
|
* Unused if the soundbus provider has no such notion.
|
||
|
|
*/
|
||
|
|
int sysclock_factor;
|
||
|
|
|
||
|
|
/* Bus factor, bus clock speed = bus_factor * sampling freq)
|
||
|
|
* Unused if the soundbus provider has no such notion.
|
||
|
|
*/
|
||
|
|
int bus_factor;
|
||
|
|
|
||
|
|
/* operations */
|
||
|
|
/* clock switching, see above */
|
||
|
|
int (*switch_clock)(struct codec_info_item *cii,
|
||
|
|
enum clock_switch clock);
|
||
|
|
|
||
|
|
/* called for each transfer_info when the user
|
||
|
|
* opens the pcm device to determine what the
|
||
|
|
* hardware can support at this point in time.
|
||
|
|
* That can depend on other user-switchable controls.
|
||
|
|
* Return 1 if usable, 0 if not.
|
||
|
|
* out points to another instance of a transfer_info
|
||
|
|
* which is initialised to the values in *ti, and
|
||
|
|
* it's format and rate values can be modified by
|
||
|
|
* the callback if it is necessary to further restrict
|
||
|
|
* the formats that can be used at the moment, for
|
||
|
|
* example when one codec has multiple logical codec
|
||
|
|
* info structs for multiple inputs.
|
||
|
|
*/
|
||
|
|
int (*usable)(struct codec_info_item *cii,
|
||
|
|
struct transfer_info *ti,
|
||
|
|
struct transfer_info *out);
|
||
|
|
|
||
|
|
/* called when pcm stream is opened, probably not implemented
|
||
|
|
* most of the time since it isn't too useful */
|
||
|
|
int (*open)(struct codec_info_item *cii,
|
||
|
|
struct snd_pcm_substream *substream);
|
||
|
|
|
||
|
|
/* called when the pcm stream is closed, at this point
|
||
|
|
* the user choices can all be unlocked (see below) */
|
||
|
|
int (*close)(struct codec_info_item *cii,
|
||
|
|
struct snd_pcm_substream *substream);
|
||
|
|
|
||
|
|
/* if the codec must forbid some user choices because
|
||
|
|
* they are not valid with the substream/transfer info,
|
||
|
|
* it must do so here. Example: no digital output for
|
||
|
|
* incompatible framerate, say 8KHz, on Onyx.
|
||
|
|
* If the selected stuff in the substream is NOT
|
||
|
|
* compatible, you have to reject this call! */
|
||
|
|
int (*prepare)(struct codec_info_item *cii,
|
||
|
|
struct bus_info *bi,
|
||
|
|
struct snd_pcm_substream *substream);
|
||
|
|
|
||
|
|
/* start() is called before data is pushed to the codec.
|
||
|
|
* Note that start() must be atomic! */
|
||
|
|
int (*start)(struct codec_info_item *cii,
|
||
|
|
struct snd_pcm_substream *substream);
|
||
|
|
|
||
|
|
/* stop() is called after data is no longer pushed to the codec.
|
||
|
|
* Note that stop() must be atomic! */
|
||
|
|
int (*stop)(struct codec_info_item *cii,
|
||
|
|
struct snd_pcm_substream *substream);
|
||
|
|
|
||
|
|
int (*suspend)(struct codec_info_item *cii, pm_message_t state);
|
||
|
|
int (*resume)(struct codec_info_item *cii);
|
||
|
|
};
|
||
|
|
|
||
|
|
/* information on a soundbus device */
|
||
|
|
struct soundbus_dev {
|
||
|
|
/* the bus it belongs to */
|
||
|
|
struct list_head onbuslist;
|
||
|
|
|
||
|
|
/* the of device it represents */
|
||
|
|
struct platform_device ofdev;
|
||
|
|
|
||
|
|
/* what modules go by */
|
||
|
|
char modalias[32];
|
||
|
|
|
||
|
|
/* These fields must be before attach_codec can be called.
|
||
|
|
* They should be set by the owner of the alsa card object
|
||
|
|
* that is needed, and whoever sets them must make sure
|
||
|
|
* that they are unique within that alsa card object. */
|
||
|
|
char *pcmname;
|
||
|
|
int pcmid;
|
||
|
|
|
||
|
|
/* this is assigned by the soundbus provider in attach_codec */
|
||
|
|
struct snd_pcm *pcm;
|
||
|
|
|
||
|
|
/* operations */
|
||
|
|
/* attach a codec to this soundbus, give the alsa
|
||
|
|
* card object the PCMs for this soundbus should be in.
|
||
|
|
* The 'data' pointer must be unique, it is used as the
|
||
|
|
* key for detach_codec(). */
|
||
|
|
int (*attach_codec)(struct soundbus_dev *dev, struct snd_card *card,
|
||
|
|
struct codec_info *ci, void *data);
|
||
|
|
void (*detach_codec)(struct soundbus_dev *dev, void *data);
|
||
|
|
/* TODO: suspend/resume */
|
||
|
|
|
||
|
|
/* private for the soundbus provider */
|
||
|
|
struct list_head codec_list;
|
||
|
|
u32 have_out:1, have_in:1;
|
||
|
|
};
|
||
|
|
#define to_soundbus_device(d) container_of(d, struct soundbus_dev, ofdev.dev)
|
||
|
|
#define of_to_soundbus_device(d) container_of(d, struct soundbus_dev, ofdev)
|
||
|
|
|
||
|
|
extern int soundbus_add_one(struct soundbus_dev *dev);
|
||
|
|
extern void soundbus_remove_one(struct soundbus_dev *dev);
|
||
|
|
|
||
|
|
extern struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev);
|
||
|
|
extern void soundbus_dev_put(struct soundbus_dev *dev);
|
||
|
|
|
||
|
|
struct soundbus_driver {
|
||
|
|
char *name;
|
||
|
|
struct module *owner;
|
||
|
|
|
||
|
|
/* we don't implement any matching at all */
|
||
|
|
|
||
|
|
int (*probe)(struct soundbus_dev* dev);
|
||
|
|
int (*remove)(struct soundbus_dev* dev);
|
||
|
|
|
||
|
|
int (*shutdown)(struct soundbus_dev* dev);
|
||
|
|
|
||
|
|
struct device_driver driver;
|
||
|
|
};
|
||
|
|
#define to_soundbus_driver(drv) container_of(drv,struct soundbus_driver, driver)
|
||
|
|
|
||
|
|
extern int soundbus_register_driver(struct soundbus_driver *drv);
|
||
|
|
extern void soundbus_unregister_driver(struct soundbus_driver *drv);
|
||
|
|
|
||
|
|
extern struct attribute *soundbus_dev_attrs[];
|
||
|
|
|
||
|
|
#endif /* __SOUNDBUS_H */
|