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1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | #ifndef __SOUND_CONTROL_H |
3 | #define __SOUND_CONTROL_H | |
4 | ||
5 | /* | |
6 | * Header file for control interface | |
c1017a4c | 7 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
8 | */ |
9 | ||
b69339ba | 10 | #include <linux/wait.h> |
088e861e | 11 | #include <linux/nospec.h> |
1da177e4 LT |
12 | #include <sound/asound.h> |
13 | ||
1da177e4 LT |
14 | #define snd_kcontrol_chip(kcontrol) ((kcontrol)->private_data) |
15 | ||
82e9bae6 TI |
16 | struct snd_kcontrol; |
17 | typedef int (snd_kcontrol_info_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_info * uinfo); | |
18 | typedef int (snd_kcontrol_get_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol); | |
19 | typedef int (snd_kcontrol_put_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol); | |
8aa9b586 | 20 | typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol, |
0cea76f3 | 21 | int op_flag, /* SNDRV_CTL_TLV_OP_XXX */ |
8aa9b586 JK |
22 | unsigned int size, |
23 | unsigned int __user *tlv); | |
24 | ||
fbd3eb7f TI |
25 | /* internal flag for skipping validations */ |
26 | #ifdef CONFIG_SND_CTL_VALIDATION | |
27 | #define SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK (1 << 27) | |
28 | #define snd_ctl_skip_validation(info) \ | |
29 | ((info)->access & SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK) | |
30 | #else | |
31 | #define SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK 0 | |
32 | #define snd_ctl_skip_validation(info) true | |
33 | #endif | |
34 | ||
0cea76f3 TI |
35 | enum { |
36 | SNDRV_CTL_TLV_OP_READ = 0, | |
37 | SNDRV_CTL_TLV_OP_WRITE = 1, | |
38 | SNDRV_CTL_TLV_OP_CMD = -1, | |
39 | }; | |
1da177e4 | 40 | |
82e9bae6 | 41 | struct snd_kcontrol_new { |
1da177e4 LT |
42 | snd_ctl_elem_iface_t iface; /* interface identifier */ |
43 | unsigned int device; /* device/client number */ | |
44 | unsigned int subdevice; /* subdevice (substream) number */ | |
5ac2ba94 | 45 | const unsigned char *name; /* ASCII name of item */ |
1da177e4 LT |
46 | unsigned int index; /* index of item */ |
47 | unsigned int access; /* access rights */ | |
48 | unsigned int count; /* count of same elements */ | |
49 | snd_kcontrol_info_t *info; | |
50 | snd_kcontrol_get_t *get; | |
51 | snd_kcontrol_put_t *put; | |
8aa9b586 JK |
52 | union { |
53 | snd_kcontrol_tlv_rw_t *c; | |
0cb29ea0 | 54 | const unsigned int *p; |
8aa9b586 | 55 | } tlv; |
1da177e4 | 56 | unsigned long private_value; |
82e9bae6 | 57 | }; |
1da177e4 | 58 | |
82e9bae6 TI |
59 | struct snd_kcontrol_volatile { |
60 | struct snd_ctl_file *owner; /* locked */ | |
1da177e4 | 61 | unsigned int access; /* access rights */ |
82e9bae6 | 62 | }; |
1da177e4 | 63 | |
82e9bae6 | 64 | struct snd_kcontrol { |
1da177e4 | 65 | struct list_head list; /* list of controls */ |
82e9bae6 | 66 | struct snd_ctl_elem_id id; |
1da177e4 LT |
67 | unsigned int count; /* count of same elements */ |
68 | snd_kcontrol_info_t *info; | |
69 | snd_kcontrol_get_t *get; | |
70 | snd_kcontrol_put_t *put; | |
8aa9b586 JK |
71 | union { |
72 | snd_kcontrol_tlv_rw_t *c; | |
0cb29ea0 | 73 | const unsigned int *p; |
8aa9b586 | 74 | } tlv; |
1da177e4 LT |
75 | unsigned long private_value; |
76 | void *private_data; | |
82e9bae6 | 77 | void (*private_free)(struct snd_kcontrol *kcontrol); |
9ad06ebb | 78 | struct snd_kcontrol_volatile vd[]; /* volatile data */ |
1da177e4 LT |
79 | }; |
80 | ||
82e9bae6 | 81 | #define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list) |
1da177e4 | 82 | |
82e9bae6 | 83 | struct snd_kctl_event { |
1da177e4 | 84 | struct list_head list; /* list of events */ |
82e9bae6 | 85 | struct snd_ctl_elem_id id; |
1da177e4 | 86 | unsigned int mask; |
82e9bae6 | 87 | }; |
1da177e4 | 88 | |
82e9bae6 | 89 | #define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list) |
1da177e4 | 90 | |
25d27ede CL |
91 | struct pid; |
92 | ||
23c18d4b TI |
93 | enum { |
94 | SND_CTL_SUBDEV_PCM, | |
95 | SND_CTL_SUBDEV_RAWMIDI, | |
96 | SND_CTL_SUBDEV_ITEMS, | |
97 | }; | |
98 | ||
82e9bae6 | 99 | struct snd_ctl_file { |
1da177e4 | 100 | struct list_head list; /* list of all control files */ |
82e9bae6 | 101 | struct snd_card *card; |
25d27ede | 102 | struct pid *pid; |
23c18d4b | 103 | int preferred_subdevice[SND_CTL_SUBDEV_ITEMS]; |
1da177e4 LT |
104 | wait_queue_head_t change_sleep; |
105 | spinlock_t read_lock; | |
106 | struct fasync_struct *fasync; | |
107 | int subscribed; /* read interface is activated */ | |
108 | struct list_head events; /* waiting events for read */ | |
109 | }; | |
110 | ||
82e9bae6 | 111 | #define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list) |
1da177e4 | 112 | |
82e9bae6 TI |
113 | typedef int (*snd_kctl_ioctl_func_t) (struct snd_card * card, |
114 | struct snd_ctl_file * control, | |
115 | unsigned int cmd, unsigned long arg); | |
1da177e4 | 116 | |
82e9bae6 | 117 | void snd_ctl_notify(struct snd_card * card, unsigned int mask, struct snd_ctl_elem_id * id); |
1da177e4 | 118 | |
82e9bae6 TI |
119 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new * kcontrolnew, void * private_data); |
120 | void snd_ctl_free_one(struct snd_kcontrol * kcontrol); | |
121 | int snd_ctl_add(struct snd_card * card, struct snd_kcontrol * kcontrol); | |
122 | int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol); | |
66b5b972 | 123 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, bool add_on_replace); |
82e9bae6 TI |
124 | int snd_ctl_remove_id(struct snd_card * card, struct snd_ctl_elem_id *id); |
125 | int snd_ctl_rename_id(struct snd_card * card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id); | |
3cbdd753 TI |
126 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, |
127 | int active); | |
82e9bae6 TI |
128 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card * card, unsigned int numid); |
129 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card * card, struct snd_ctl_elem_id *id); | |
1da177e4 | 130 | |
82e9bae6 | 131 | int snd_ctl_create(struct snd_card *card); |
1da177e4 LT |
132 | |
133 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn); | |
134 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn); | |
135 | #ifdef CONFIG_COMPAT | |
136 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn); | |
137 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn); | |
138 | #else | |
139 | #define snd_ctl_register_ioctl_compat(fcn) | |
140 | #define snd_ctl_unregister_ioctl_compat(fcn) | |
141 | #endif | |
142 | ||
23c18d4b TI |
143 | int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type); |
144 | ||
82e9bae6 | 145 | static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
1da177e4 | 146 | { |
088e861e TI |
147 | unsigned int ioff = id->numid - kctl->id.numid; |
148 | return array_index_nospec(ioff, kctl->count); | |
1da177e4 LT |
149 | } |
150 | ||
82e9bae6 | 151 | static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
1da177e4 | 152 | { |
088e861e TI |
153 | unsigned int ioff = id->index - kctl->id.index; |
154 | return array_index_nospec(ioff, kctl->count); | |
1da177e4 LT |
155 | } |
156 | ||
82e9bae6 | 157 | static inline unsigned int snd_ctl_get_ioff(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
1da177e4 LT |
158 | { |
159 | if (id->numid) { | |
160 | return snd_ctl_get_ioffnum(kctl, id); | |
161 | } else { | |
162 | return snd_ctl_get_ioffidx(kctl, id); | |
163 | } | |
164 | } | |
165 | ||
82e9bae6 TI |
166 | static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id *dst_id, |
167 | struct snd_kcontrol *src_kctl, | |
1da177e4 LT |
168 | unsigned int offset) |
169 | { | |
170 | *dst_id = src_kctl->id; | |
171 | dst_id->index += offset; | |
172 | dst_id->numid += offset; | |
173 | return dst_id; | |
174 | } | |
175 | ||
b9ed4f2b | 176 | /* |
9600732b | 177 | * Frequently used control callbacks/helpers |
b9ed4f2b TI |
178 | */ |
179 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, | |
180 | struct snd_ctl_elem_info *uinfo); | |
181 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, | |
182 | struct snd_ctl_elem_info *uinfo); | |
9600732b CL |
183 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, |
184 | unsigned int items, const char *const names[]); | |
b9ed4f2b | 185 | |
e922b002 TI |
186 | /* |
187 | * virtual master control | |
188 | */ | |
189 | struct snd_kcontrol *snd_ctl_make_virtual_master(char *name, | |
190 | const unsigned int *tlv); | |
9ab0cb30 TI |
191 | int _snd_ctl_add_follower(struct snd_kcontrol *master, |
192 | struct snd_kcontrol *follower, | |
193 | unsigned int flags); | |
194 | /* optional flags for follower */ | |
195 | #define SND_CTL_FOLLOWER_NEED_UPDATE (1 << 0) | |
f5b1db63 | 196 | |
79c7cdd5 | 197 | /** |
9ab0cb30 | 198 | * snd_ctl_add_follower - Add a virtual follower control |
79c7cdd5 | 199 | * @master: vmaster element |
9ab0cb30 | 200 | * @follower: follower element to add |
79c7cdd5 | 201 | * |
9ab0cb30 | 202 | * Add a virtual follower control to the given master element created via |
79c7cdd5 | 203 | * snd_ctl_create_virtual_master() beforehand. |
79c7cdd5 | 204 | * |
9ab0cb30 | 205 | * All followers must be the same type (returning the same information |
25985edc | 206 | * via info callback). The function doesn't check it, so it's your |
79c7cdd5 TI |
207 | * responsibility. |
208 | * | |
209 | * Also, some additional limitations: | |
210 | * at most two channels, | |
211 | * logarithmic volume control (dB level) thus no linear volume, | |
212 | * master can only attenuate the volume without gain | |
eb7c06e8 YB |
213 | * |
214 | * Return: Zero if successful or a negative error code. | |
79c7cdd5 | 215 | */ |
f5b1db63 | 216 | static inline int |
9ab0cb30 | 217 | snd_ctl_add_follower(struct snd_kcontrol *master, struct snd_kcontrol *follower) |
f5b1db63 | 218 | { |
9ab0cb30 | 219 | return _snd_ctl_add_follower(master, follower, 0); |
f5b1db63 TI |
220 | } |
221 | ||
79c7cdd5 | 222 | /** |
9ab0cb30 | 223 | * snd_ctl_add_follower_uncached - Add a virtual follower control |
79c7cdd5 | 224 | * @master: vmaster element |
9ab0cb30 | 225 | * @follower: follower element to add |
79c7cdd5 | 226 | * |
9ab0cb30 TI |
227 | * Add a virtual follower control to the given master. |
228 | * Unlike snd_ctl_add_follower(), the element added via this function | |
79c7cdd5 | 229 | * is supposed to have volatile values, and get callback is called |
1a6ab46f | 230 | * at each time queried from the master. |
79c7cdd5 TI |
231 | * |
232 | * When the control peeks the hardware values directly and the value | |
233 | * can be changed by other means than the put callback of the element, | |
234 | * this function should be used to keep the value always up-to-date. | |
eb7c06e8 YB |
235 | * |
236 | * Return: Zero if successful or a negative error code. | |
79c7cdd5 | 237 | */ |
f5b1db63 | 238 | static inline int |
9ab0cb30 TI |
239 | snd_ctl_add_follower_uncached(struct snd_kcontrol *master, |
240 | struct snd_kcontrol *follower) | |
f5b1db63 | 241 | { |
9ab0cb30 | 242 | return _snd_ctl_add_follower(master, follower, SND_CTL_FOLLOWER_NEED_UPDATE); |
f5b1db63 TI |
243 | } |
244 | ||
2ad787e9 TI |
245 | int snd_ctl_add_vmaster_hook(struct snd_kcontrol *kctl, |
246 | void (*hook)(void *private_data, int), | |
247 | void *private_data); | |
1ca2f2ec TI |
248 | void snd_ctl_sync_vmaster(struct snd_kcontrol *kctl, bool hook_only); |
249 | #define snd_ctl_sync_vmaster_hook(kctl) snd_ctl_sync_vmaster(kctl, true) | |
9ab0cb30 TI |
250 | int snd_ctl_apply_vmaster_followers(struct snd_kcontrol *kctl, |
251 | int (*func)(struct snd_kcontrol *vfollower, | |
252 | struct snd_kcontrol *follower, | |
253 | void *arg), | |
254 | void *arg); | |
2ad787e9 | 255 | |
35be544a TI |
256 | /* |
257 | * Helper functions for jack-detection controls | |
258 | */ | |
259 | struct snd_kcontrol * | |
2ba2dfa1 | 260 | snd_kctl_jack_new(const char *name, struct snd_card *card); |
35be544a TI |
261 | void snd_kctl_jack_report(struct snd_card *card, |
262 | struct snd_kcontrol *kctl, bool status); | |
263 | ||
1da177e4 | 264 | #endif /* __SOUND_CONTROL_H */ |