/* SPDX-License-Identifier: GPL-2.0-or-later */#ifndef __SOUND_CONTROL_H#define __SOUND_CONTROL_H /* *  Header file for control interface *  Copyright (c) by Jaroslav Kysela <perex@perex.cz> */ #include <linux/rwsem.h>#include <linux/wait.h>#include <linux/nospec.h>#include <sound/asound.h> #define snd_kcontrol_chip(kcontrol) ((kcontrol)->private_data) struct snd_kcontrol;typedef int (snd_kcontrol_info_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_info * uinfo);typedef int (snd_kcontrol_get_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);typedef int (snd_kcontrol_put_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol,				    int op_flag, /* SNDRV_CTL_TLV_OP_XXX */				    unsigned int size,				    unsigned int __user *tlv); /* internal flag for skipping validations */#ifdef CONFIG_SND_CTL_DEBUG#define SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK	(1 << 24)#define snd_ctl_skip_validation(info) \	((info)->access & SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK)#else#define SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK	0#define snd_ctl_skip_validation(info)		true#endif /* kernel only - LED bits */#define SNDRV_CTL_ELEM_ACCESS_LED_SHIFT		25#define SNDRV_CTL_ELEM_ACCESS_LED_MASK		(7<<25) /* kernel three bits - LED group */#define SNDRV_CTL_ELEM_ACCESS_SPK_LED		(1<<25) /* kernel speaker (output) LED flag */#define SNDRV_CTL_ELEM_ACCESS_MIC_LED		(2<<25) /* kernel microphone (input) LED flag */ enum {	SNDRV_CTL_TLV_OP_READ = 0,	SNDRV_CTL_TLV_OP_WRITE = 1,	SNDRV_CTL_TLV_OP_CMD = -1,}; struct snd_kcontrol_new {	snd_ctl_elem_iface_t iface;	/* interface identifier */	unsigned int device;		/* device/client number */	unsigned int subdevice;		/* subdevice (substream) number */	const char *name;		/* ASCII name of item */	unsigned int index;		/* index of item */	unsigned int access;		/* access rights */	unsigned int count;		/* count of same elements */	snd_kcontrol_info_t *info;	snd_kcontrol_get_t *get;	snd_kcontrol_put_t *put;	union {		snd_kcontrol_tlv_rw_t *c;		const unsigned int *p;	} tlv;	unsigned long private_value;}; struct snd_kcontrol_volatile {	struct snd_ctl_file *owner;	/* locked */	unsigned int access;	/* access rights */}; struct snd_kcontrol {	struct list_head list;		/* list of controls */	struct snd_ctl_elem_id id;	unsigned int count;		/* count of same elements */	snd_kcontrol_info_t *info;	snd_kcontrol_get_t *get;	snd_kcontrol_put_t *put;	union {		snd_kcontrol_tlv_rw_t *c;		const unsigned int *p;	} tlv;	unsigned long private_value;	void *private_data;	void (*private_free)(struct snd_kcontrol *kcontrol);	struct snd_kcontrol_volatile vd[] __counted_by(count);	/* volatile data */}; #define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list) struct snd_kctl_event {	struct list_head list;	/* list of events */	struct snd_ctl_elem_id id;	unsigned int mask;}; #define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list) struct pid; enum {	SND_CTL_SUBDEV_PCM,	SND_CTL_SUBDEV_RAWMIDI,	SND_CTL_SUBDEV_ITEMS,}; struct snd_ctl_file {	struct list_head list;		/* list of all control files */	struct snd_card *card;	struct pid *pid;	int preferred_subdevice[SND_CTL_SUBDEV_ITEMS];	wait_queue_head_t change_sleep;	spinlock_t read_lock;	struct snd_fasync *fasync;	int subscribed;			/* read interface is activated */	struct list_head events;	/* waiting events for read */}; struct snd_ctl_layer_ops {	struct snd_ctl_layer_ops *next;	const char *module_name;	void (*lregister)(struct snd_card *card);	void (*ldisconnect)(struct snd_card *card);	void (*lnotify)(struct snd_card *card, unsigned int mask, struct snd_kcontrol *kctl, unsigned int ioff);}; #define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list) typedef int (*snd_kctl_ioctl_func_t) (struct snd_card * card,				      struct snd_ctl_file * control,				      unsigned int cmd, unsigned long arg); void snd_ctl_notify(struct snd_card * card, unsigned int mask, struct snd_ctl_elem_id * id);void snd_ctl_notify_one(struct snd_card * card, unsigned int mask, struct snd_kcontrol * kctl, unsigned int ioff); struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new * kcontrolnew, void * private_data);void snd_ctl_free_one(struct snd_kcontrol * kcontrol);int snd_ctl_add(struct snd_card * card, struct snd_kcontrol * kcontrol);int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol);int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, bool add_on_replace);int snd_ctl_remove_id(struct snd_card * card, struct snd_ctl_elem_id *id);int snd_ctl_rename_id(struct snd_card * card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id);void snd_ctl_rename(struct snd_card *card, struct snd_kcontrol *kctl, const char *name);int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, int active);struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid);struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, const struct snd_ctl_elem_id *id); /** * snd_ctl_find_id_mixer - find the control instance with the given name string * @card: the card instance * @name: the name string * * Finds the control instance with the given name and * @SNDRV_CTL_ELEM_IFACE_MIXER. Other fields are set to zero. * * This is merely a wrapper to snd_ctl_find_id(). * * Return: The pointer of the instance if found, or %NULL if not. */static inline struct snd_kcontrol *snd_ctl_find_id_mixer(struct snd_card *card, const char *name){	struct snd_ctl_elem_id id = {}; 	id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;	strscpy(id.name, name, sizeof(id.name));	return snd_ctl_find_id(card, &id);} int snd_ctl_create(struct snd_card *card); extern struct rw_semaphore snd_ioctl_rwsem; int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn);#ifdef CONFIG_COMPATint snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn);int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn);#else#define snd_ctl_register_ioctl_compat(fcn)#define snd_ctl_unregister_ioctl_compat(fcn)#endif int snd_ctl_request_layer(const char *module_name);void snd_ctl_register_layer(struct snd_ctl_layer_ops *lops);void snd_ctl_disconnect_layer(struct snd_ctl_layer_ops *lops); int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type); static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id){	unsigned int ioff = id->numid - kctl->id.numid;	return array_index_nospec(ioff, kctl->count);} static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id){	unsigned int ioff = id->index - kctl->id.index;	return array_index_nospec(ioff, kctl->count);} static inline unsigned int snd_ctl_get_ioff(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id){	if (id->numid) {		return snd_ctl_get_ioffnum(kctl, id);	} else {		return snd_ctl_get_ioffidx(kctl, id);	}} static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id *dst_id,						    struct snd_kcontrol *src_kctl,						    unsigned int offset){	*dst_id = src_kctl->id;	dst_id->index += offset;	dst_id->numid += offset;	return dst_id;} /* * Frequently used control callbacks/helpers */int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,			      struct snd_ctl_elem_info *uinfo);int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,				struct snd_ctl_elem_info *uinfo);int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,		      unsigned int items, const char *const names[]); /* * virtual master control */struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,						 const unsigned int *tlv);int _snd_ctl_add_follower(struct snd_kcontrol *master,			  struct snd_kcontrol *follower,			  unsigned int flags);/* optional flags for follower */#define SND_CTL_FOLLOWER_NEED_UPDATE	(1 << 0) /** * snd_ctl_add_follower - Add a virtual follower control * @master: vmaster element * @follower: follower element to add * * Add a virtual follower control to the given master element created via * snd_ctl_create_virtual_master() beforehand. * * All followers must be the same type (returning the same information * via info callback).  The function doesn't check it, so it's your * responsibility. * * Also, some additional limitations: * at most two channels, * logarithmic volume control (dB level) thus no linear volume, * master can only attenuate the volume without gain * * Return: Zero if successful or a negative error code. */static inline intsnd_ctl_add_follower(struct snd_kcontrol *master, struct snd_kcontrol *follower){	return _snd_ctl_add_follower(master, follower, 0);} int snd_ctl_add_followers(struct snd_card *card, struct snd_kcontrol *master,			  const char * const *list); /** * snd_ctl_add_follower_uncached - Add a virtual follower control * @master: vmaster element * @follower: follower element to add * * Add a virtual follower control to the given master. * Unlike snd_ctl_add_follower(), the element added via this function * is supposed to have volatile values, and get callback is called * at each time queried from the master. * * When the control peeks the hardware values directly and the value * can be changed by other means than the put callback of the element, * this function should be used to keep the value always up-to-date. * * Return: Zero if successful or a negative error code. */static inline intsnd_ctl_add_follower_uncached(struct snd_kcontrol *master,			      struct snd_kcontrol *follower){	return _snd_ctl_add_follower(master, follower, SND_CTL_FOLLOWER_NEED_UPDATE);} int snd_ctl_add_vmaster_hook(struct snd_kcontrol *kctl,			     void (*hook)(void *private_data, int),			     void *private_data);void snd_ctl_sync_vmaster(struct snd_kcontrol *kctl, bool hook_only);#define snd_ctl_sync_vmaster_hook(kctl)	snd_ctl_sync_vmaster(kctl, true)int snd_ctl_apply_vmaster_followers(struct snd_kcontrol *kctl,				    int (*func)(struct snd_kcontrol *vfollower,						struct snd_kcontrol *follower,						void *arg),				    void *arg); /* * Control LED trigger layer */#define SND_CTL_LAYER_MODULE_LED	"snd-ctl-led" #if IS_MODULE(CONFIG_SND_CTL_LED)static inline int snd_ctl_led_request(void) { return snd_ctl_request_layer(SND_CTL_LAYER_MODULE_LED); }#elsestatic inline int snd_ctl_led_request(void) { return 0; }#endif /* * Helper functions for jack-detection controls */struct snd_kcontrol *snd_kctl_jack_new(const char *name, struct snd_card *card);void snd_kctl_jack_report(struct snd_card *card,			  struct snd_kcontrol *kctl, bool status); #endif	/* __SOUND_CONTROL_H */