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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 | 25 | /* internal flag for skipping validations */ |
1b7ec514 | 26 | #ifdef CONFIG_SND_CTL_DEBUG |
22d8de62 | 27 | #define SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK (1 << 24) |
fbd3eb7f TI |
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 | ||
22d8de62 JK |
35 | /* kernel only - LED bits */ |
36 | #define SNDRV_CTL_ELEM_ACCESS_LED_SHIFT 25 | |
37 | #define SNDRV_CTL_ELEM_ACCESS_LED_MASK (7<<25) /* kernel three bits - LED group */ | |
38 | #define SNDRV_CTL_ELEM_ACCESS_SPK_LED (1<<25) /* kernel speaker (output) LED flag */ | |
39 | #define SNDRV_CTL_ELEM_ACCESS_MIC_LED (2<<25) /* kernel microphone (input) LED flag */ | |
40 | ||
0cea76f3 TI |
41 | enum { |
42 | SNDRV_CTL_TLV_OP_READ = 0, | |
43 | SNDRV_CTL_TLV_OP_WRITE = 1, | |
44 | SNDRV_CTL_TLV_OP_CMD = -1, | |
45 | }; | |
1da177e4 | 46 | |
82e9bae6 | 47 | struct snd_kcontrol_new { |
1da177e4 LT |
48 | snd_ctl_elem_iface_t iface; /* interface identifier */ |
49 | unsigned int device; /* device/client number */ | |
50 | unsigned int subdevice; /* subdevice (substream) number */ | |
2a6eca16 | 51 | const char *name; /* ASCII name of item */ |
1da177e4 LT |
52 | unsigned int index; /* index of item */ |
53 | unsigned int access; /* access rights */ | |
54 | unsigned int count; /* count of same elements */ | |
55 | snd_kcontrol_info_t *info; | |
56 | snd_kcontrol_get_t *get; | |
57 | snd_kcontrol_put_t *put; | |
8aa9b586 JK |
58 | union { |
59 | snd_kcontrol_tlv_rw_t *c; | |
0cb29ea0 | 60 | const unsigned int *p; |
8aa9b586 | 61 | } tlv; |
1da177e4 | 62 | unsigned long private_value; |
82e9bae6 | 63 | }; |
1da177e4 | 64 | |
82e9bae6 TI |
65 | struct snd_kcontrol_volatile { |
66 | struct snd_ctl_file *owner; /* locked */ | |
1da177e4 | 67 | unsigned int access; /* access rights */ |
82e9bae6 | 68 | }; |
1da177e4 | 69 | |
82e9bae6 | 70 | struct snd_kcontrol { |
1da177e4 | 71 | struct list_head list; /* list of controls */ |
82e9bae6 | 72 | struct snd_ctl_elem_id id; |
1da177e4 LT |
73 | unsigned int count; /* count of same elements */ |
74 | snd_kcontrol_info_t *info; | |
75 | snd_kcontrol_get_t *get; | |
76 | snd_kcontrol_put_t *put; | |
8aa9b586 JK |
77 | union { |
78 | snd_kcontrol_tlv_rw_t *c; | |
0cb29ea0 | 79 | const unsigned int *p; |
8aa9b586 | 80 | } tlv; |
1da177e4 LT |
81 | unsigned long private_value; |
82 | void *private_data; | |
82e9bae6 | 83 | void (*private_free)(struct snd_kcontrol *kcontrol); |
9ad06ebb | 84 | struct snd_kcontrol_volatile vd[]; /* volatile data */ |
1da177e4 LT |
85 | }; |
86 | ||
82e9bae6 | 87 | #define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list) |
1da177e4 | 88 | |
82e9bae6 | 89 | struct snd_kctl_event { |
1da177e4 | 90 | struct list_head list; /* list of events */ |
82e9bae6 | 91 | struct snd_ctl_elem_id id; |
1da177e4 | 92 | unsigned int mask; |
82e9bae6 | 93 | }; |
1da177e4 | 94 | |
82e9bae6 | 95 | #define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list) |
1da177e4 | 96 | |
25d27ede CL |
97 | struct pid; |
98 | ||
23c18d4b TI |
99 | enum { |
100 | SND_CTL_SUBDEV_PCM, | |
101 | SND_CTL_SUBDEV_RAWMIDI, | |
102 | SND_CTL_SUBDEV_ITEMS, | |
103 | }; | |
104 | ||
82e9bae6 | 105 | struct snd_ctl_file { |
1da177e4 | 106 | struct list_head list; /* list of all control files */ |
82e9bae6 | 107 | struct snd_card *card; |
25d27ede | 108 | struct pid *pid; |
23c18d4b | 109 | int preferred_subdevice[SND_CTL_SUBDEV_ITEMS]; |
1da177e4 LT |
110 | wait_queue_head_t change_sleep; |
111 | spinlock_t read_lock; | |
4a971e84 | 112 | struct snd_fasync *fasync; |
1da177e4 LT |
113 | int subscribed; /* read interface is activated */ |
114 | struct list_head events; /* waiting events for read */ | |
115 | }; | |
116 | ||
3f0638a0 JK |
117 | struct snd_ctl_layer_ops { |
118 | struct snd_ctl_layer_ops *next; | |
119 | const char *module_name; | |
120 | void (*lregister)(struct snd_card *card); | |
121 | void (*ldisconnect)(struct snd_card *card); | |
122 | void (*lnotify)(struct snd_card *card, unsigned int mask, struct snd_kcontrol *kctl, unsigned int ioff); | |
123 | }; | |
124 | ||
82e9bae6 | 125 | #define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list) |
1da177e4 | 126 | |
82e9bae6 TI |
127 | typedef int (*snd_kctl_ioctl_func_t) (struct snd_card * card, |
128 | struct snd_ctl_file * control, | |
129 | unsigned int cmd, unsigned long arg); | |
1da177e4 | 130 | |
82e9bae6 | 131 | void snd_ctl_notify(struct snd_card * card, unsigned int mask, struct snd_ctl_elem_id * id); |
1fa4445f | 132 | void snd_ctl_notify_one(struct snd_card * card, unsigned int mask, struct snd_kcontrol * kctl, unsigned int ioff); |
1da177e4 | 133 | |
82e9bae6 TI |
134 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new * kcontrolnew, void * private_data); |
135 | void snd_ctl_free_one(struct snd_kcontrol * kcontrol); | |
136 | int snd_ctl_add(struct snd_card * card, struct snd_kcontrol * kcontrol); | |
137 | int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol); | |
66b5b972 | 138 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, bool add_on_replace); |
82e9bae6 TI |
139 | int snd_ctl_remove_id(struct snd_card * card, struct snd_ctl_elem_id *id); |
140 | int snd_ctl_rename_id(struct snd_card * card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id); | |
966f015f | 141 | void snd_ctl_rename(struct snd_card *card, struct snd_kcontrol *kctl, const char *name); |
1fa4445f | 142 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, int active); |
82e9bae6 TI |
143 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card * card, unsigned int numid); |
144 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card * card, struct snd_ctl_elem_id *id); | |
1da177e4 | 145 | |
82e9bae6 | 146 | int snd_ctl_create(struct snd_card *card); |
1da177e4 LT |
147 | |
148 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn); | |
149 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn); | |
150 | #ifdef CONFIG_COMPAT | |
151 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn); | |
152 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn); | |
153 | #else | |
154 | #define snd_ctl_register_ioctl_compat(fcn) | |
155 | #define snd_ctl_unregister_ioctl_compat(fcn) | |
156 | #endif | |
157 | ||
3f0638a0 JK |
158 | int snd_ctl_request_layer(const char *module_name); |
159 | void snd_ctl_register_layer(struct snd_ctl_layer_ops *lops); | |
160 | void snd_ctl_disconnect_layer(struct snd_ctl_layer_ops *lops); | |
161 | ||
23c18d4b TI |
162 | int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type); |
163 | ||
82e9bae6 | 164 | static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
1da177e4 | 165 | { |
088e861e TI |
166 | unsigned int ioff = id->numid - kctl->id.numid; |
167 | return array_index_nospec(ioff, kctl->count); | |
1da177e4 LT |
168 | } |
169 | ||
82e9bae6 | 170 | static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
1da177e4 | 171 | { |
088e861e TI |
172 | unsigned int ioff = id->index - kctl->id.index; |
173 | return array_index_nospec(ioff, kctl->count); | |
1da177e4 LT |
174 | } |
175 | ||
82e9bae6 | 176 | static inline unsigned int snd_ctl_get_ioff(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
1da177e4 LT |
177 | { |
178 | if (id->numid) { | |
179 | return snd_ctl_get_ioffnum(kctl, id); | |
180 | } else { | |
181 | return snd_ctl_get_ioffidx(kctl, id); | |
182 | } | |
183 | } | |
184 | ||
82e9bae6 TI |
185 | static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id *dst_id, |
186 | struct snd_kcontrol *src_kctl, | |
1da177e4 LT |
187 | unsigned int offset) |
188 | { | |
189 | *dst_id = src_kctl->id; | |
190 | dst_id->index += offset; | |
191 | dst_id->numid += offset; | |
192 | return dst_id; | |
193 | } | |
194 | ||
b9ed4f2b | 195 | /* |
9600732b | 196 | * Frequently used control callbacks/helpers |
b9ed4f2b TI |
197 | */ |
198 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, | |
199 | struct snd_ctl_elem_info *uinfo); | |
200 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, | |
201 | struct snd_ctl_elem_info *uinfo); | |
9600732b CL |
202 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, |
203 | unsigned int items, const char *const names[]); | |
b9ed4f2b | 204 | |
e922b002 TI |
205 | /* |
206 | * virtual master control | |
207 | */ | |
208 | struct snd_kcontrol *snd_ctl_make_virtual_master(char *name, | |
209 | const unsigned int *tlv); | |
9ab0cb30 TI |
210 | int _snd_ctl_add_follower(struct snd_kcontrol *master, |
211 | struct snd_kcontrol *follower, | |
212 | unsigned int flags); | |
213 | /* optional flags for follower */ | |
214 | #define SND_CTL_FOLLOWER_NEED_UPDATE (1 << 0) | |
f5b1db63 | 215 | |
79c7cdd5 | 216 | /** |
9ab0cb30 | 217 | * snd_ctl_add_follower - Add a virtual follower control |
79c7cdd5 | 218 | * @master: vmaster element |
9ab0cb30 | 219 | * @follower: follower element to add |
79c7cdd5 | 220 | * |
9ab0cb30 | 221 | * Add a virtual follower control to the given master element created via |
79c7cdd5 | 222 | * snd_ctl_create_virtual_master() beforehand. |
79c7cdd5 | 223 | * |
9ab0cb30 | 224 | * All followers must be the same type (returning the same information |
25985edc | 225 | * via info callback). The function doesn't check it, so it's your |
79c7cdd5 TI |
226 | * responsibility. |
227 | * | |
228 | * Also, some additional limitations: | |
229 | * at most two channels, | |
230 | * logarithmic volume control (dB level) thus no linear volume, | |
231 | * master can only attenuate the volume without gain | |
eb7c06e8 YB |
232 | * |
233 | * Return: Zero if successful or a negative error code. | |
79c7cdd5 | 234 | */ |
f5b1db63 | 235 | static inline int |
9ab0cb30 | 236 | snd_ctl_add_follower(struct snd_kcontrol *master, struct snd_kcontrol *follower) |
f5b1db63 | 237 | { |
9ab0cb30 | 238 | return _snd_ctl_add_follower(master, follower, 0); |
f5b1db63 TI |
239 | } |
240 | ||
79c7cdd5 | 241 | /** |
9ab0cb30 | 242 | * snd_ctl_add_follower_uncached - Add a virtual follower control |
79c7cdd5 | 243 | * @master: vmaster element |
9ab0cb30 | 244 | * @follower: follower element to add |
79c7cdd5 | 245 | * |
9ab0cb30 TI |
246 | * Add a virtual follower control to the given master. |
247 | * Unlike snd_ctl_add_follower(), the element added via this function | |
79c7cdd5 | 248 | * is supposed to have volatile values, and get callback is called |
1a6ab46f | 249 | * at each time queried from the master. |
79c7cdd5 TI |
250 | * |
251 | * When the control peeks the hardware values directly and the value | |
252 | * can be changed by other means than the put callback of the element, | |
253 | * this function should be used to keep the value always up-to-date. | |
eb7c06e8 YB |
254 | * |
255 | * Return: Zero if successful or a negative error code. | |
79c7cdd5 | 256 | */ |
f5b1db63 | 257 | static inline int |
9ab0cb30 TI |
258 | snd_ctl_add_follower_uncached(struct snd_kcontrol *master, |
259 | struct snd_kcontrol *follower) | |
f5b1db63 | 260 | { |
9ab0cb30 | 261 | return _snd_ctl_add_follower(master, follower, SND_CTL_FOLLOWER_NEED_UPDATE); |
f5b1db63 TI |
262 | } |
263 | ||
2ad787e9 TI |
264 | int snd_ctl_add_vmaster_hook(struct snd_kcontrol *kctl, |
265 | void (*hook)(void *private_data, int), | |
266 | void *private_data); | |
1ca2f2ec TI |
267 | void snd_ctl_sync_vmaster(struct snd_kcontrol *kctl, bool hook_only); |
268 | #define snd_ctl_sync_vmaster_hook(kctl) snd_ctl_sync_vmaster(kctl, true) | |
9ab0cb30 TI |
269 | int snd_ctl_apply_vmaster_followers(struct snd_kcontrol *kctl, |
270 | int (*func)(struct snd_kcontrol *vfollower, | |
271 | struct snd_kcontrol *follower, | |
272 | void *arg), | |
273 | void *arg); | |
2ad787e9 | 274 | |
22d8de62 JK |
275 | /* |
276 | * Control LED trigger layer | |
277 | */ | |
278 | #define SND_CTL_LAYER_MODULE_LED "snd-ctl-led" | |
279 | ||
280 | #if IS_MODULE(CONFIG_SND_CTL_LED) | |
281 | static inline int snd_ctl_led_request(void) { return snd_ctl_request_layer(SND_CTL_LAYER_MODULE_LED); } | |
282 | #else | |
283 | static inline int snd_ctl_led_request(void) { return 0; } | |
284 | #endif | |
285 | ||
35be544a TI |
286 | /* |
287 | * Helper functions for jack-detection controls | |
288 | */ | |
289 | struct snd_kcontrol * | |
2ba2dfa1 | 290 | snd_kctl_jack_new(const char *name, struct snd_card *card); |
35be544a TI |
291 | void snd_kctl_jack_report(struct snd_card *card, |
292 | struct snd_kcontrol *kctl, bool status); | |
293 | ||
1da177e4 | 294 | #endif /* __SOUND_CONTROL_H */ |