2 * \file include/use-case.h
3 * \brief use case interface for the ALSA driver
4 * \author Liam Girdwood <lrg@slimlogic.co.uk>
5 * \author Stefan Schmidt <stefan@slimlogic.co.uk>
6 * \author Jaroslav Kysela <perex@perex.cz>
7 * \author Justin Xu <justinx@slimlogic.co.uk>
12 * This library is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Lesser General Public License as
14 * published by the Free Software Foundation; either version 2.1 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with this library; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * Copyright (C) 2008-2010 SlimLogic Ltd
27 * Copyright (C) 2010 Wolfson Microelectronics PLC
28 * Copyright (C) 2010 Texas Instruments Inc.
30 * Support for the verb/device/modifier core logic and API,
31 * command line tool and file parser was kindly sponsored by
32 * Texas Instruments Inc.
33 * Support for multiple active modifiers and devices,
34 * transition sequences, multiple client access and user defined use
35 * cases was kindly sponsored by Wolfson Microelectronics PLC.
38 #ifndef __ALSA_USE_CASE_H
39 #define __ALSA_USE_CASE_H
46 * \defgroup Use Case Interface
47 * The ALSA Use Case manager interface.
48 * See \ref Usecase page for more details.
53 * ALSA Use Case Interface
55 * The use case manager works by configuring the sound card ALSA kcontrols to
56 * change the hardware digital and analog audio routing to match the requested
57 * device use case. The use case manager kcontrol configurations are stored in
58 * easy to modify text files.
60 * An audio use case can be defined by a verb and device parameter. The verb
61 * describes the use case action i.e. a phone call, listening to music, recording
62 * a conversation etc. The device describes the physical audio capture and playback
63 * hardware i.e. headphones, phone handset, bluetooth headset, etc.
65 * It's intended clients will mostly only need to set the use case verb and
66 * device for each system use case change (as the verb and device parameters
67 * cover most audio use cases).
69 * However there are times when a use case has to be modified at runtime. e.g.
71 * o Incoming phone call when the device is playing music
72 * o Recording sections of a phone call
73 * o Playing tones during a call.
75 * In order to allow asynchronous runtime use case adaptations, we have a third
76 * optional modifier parameter that can be used to further configure
77 * the use case during live audio runtime.
79 * This interface allows clients to :-
81 * o Query the supported use case verbs, devices and modifiers for the machine.
82 * o Set and Get use case verbs, devices and modifiers for the machine.
83 * o Get the ALSA PCM playback and capture device PCMs for use case verb,
84 * use case device and modifier.
85 * o Get the TQ parameter for each use case verb, use case device and
87 * o Get the ALSA master playback and capture volume/switch kcontrols
95 * The use case verb is the main device audio action. e.g. the "HiFi" use
96 * case verb will configure the audio hardware for HiFi Music playback
99 #define SND_USE_CASE_VERB_INACTIVE "Inactive"
100 #define SND_USE_CASE_VERB_HIFI "HiFi"
101 #define SND_USE_CASE_VERB_HIFI_LOW_POWER "HiFi Low Power"
102 #define SND_USE_CASE_VERB_VOICE "Voice"
103 #define SND_USE_CASE_VERB_VOICE_LOW_POWER "Voice Low Power"
104 #define SND_USE_CASE_VERB_VOICECALL "Voice Call"
105 #define SND_USE_CASE_VERB_IP_VOICECALL "Voice Call IP"
106 #define SND_USE_CASE_VERB_ANALOG_RADIO "FM Analog Radio"
107 #define SND_USE_CASE_VERB_DIGITAL_RADIO "FM Digital Radio"
108 /* add new verbs to end of list */
114 * Physical system devices the render and capture audio. Devices can be OR'ed
115 * together to support audio on simultaneous devices.
117 #define SND_USE_CASE_DEV_NONE "None"
118 #define SND_USE_CASE_DEV_SPEAKER "Speaker"
119 #define SND_USE_CASE_DEV_LINE "Line"
120 #define SND_USE_CASE_DEV_HEADPHONES "Headphones"
121 #define SND_USE_CASE_DEV_HEADSET "Headset"
122 #define SND_USE_CASE_DEV_HANDSET "Handset"
123 #define SND_USE_CASE_DEV_BLUETOOTH "Bluetooth"
124 #define SND_USE_CASE_DEV_EARPIECE "Earpiece"
125 #define SND_USE_CASE_DEV_SPDIF "SPDIF"
126 #define SND_USE_CASE_DEV_HDMI "HDMI"
127 /* add new devices to end of list */
131 * Use Case Modifiers.
133 * The use case modifier allows runtime configuration changes to deal with
134 * asynchronous events.
136 * e.g. to record a voice call :-
137 * 1. Set verb to SND_USE_CASE_VERB_VOICECALL (for voice call)
138 * 2. Set modifier SND_USE_CASE_MOD_CAPTURE_VOICE when capture required.
139 * 3. Call snd_use_case_get("CapturePCM") to get ALSA source PCM name
140 * with captured voice pcm data.
142 * e.g. to play a ring tone when listenin to MP3 Music :-
143 * 1. Set verb to SND_USE_CASE_VERB_HIFI (for MP3 playback)
144 * 2. Set modifier to SND_USE_CASE_MOD_PLAY_TONE when incoming call happens.
145 * 3. Call snd_use_case_get("PlaybackPCM") to get ALSA PCM sink name for
148 #define SND_USE_CASE_MOD_CAPTURE_VOICE "Capture Voice"
149 #define SND_USE_CASE_MOD_CAPTURE_MUSIC "Capture Music"
150 #define SND_USE_CASE_MOD_PLAY_MUSIC "Play Music"
151 #define SND_USE_CASE_MOD_PLAY_VOICE "Play Voice"
152 #define SND_USE_CASE_MOD_PLAY_TONE "Play Tone"
153 #define SND_USE_CASE_MOD_ECHO_REF "Echo Reference"
154 /* add new modifiers to end of list */
160 * The interface allows clients to determine the audio TQ required for each
161 * use case verb and modifier. It's intended as an optional hint to the
162 * audio driver in order to lower power consumption.
165 #define SND_USE_CASE_TQ_MUSIC "Music"
166 #define SND_USE_CASE_TQ_VOICE "Voice"
167 #define SND_USE_CASE_TQ_TONES "Tones"
169 /** use case container */
170 typedef struct snd_use_case_mgr snd_use_case_mgr_t;
173 * \brief Create an identifier
174 * \param fmt Format (sprintf like)
175 * \param ... Optional arguments for sprintf like format
176 * \return Allocated string identifier or NULL on error
178 char *snd_use_case_identifier(const char *fmt, ...);
181 * \brief Free a string list
182 * \param list The string list to free
183 * \param items Count of strings
184 * \return Zero if success, otherwise a negative error code
186 int snd_use_case_free_list(const char *list[], int items);
189 * \brief Obtain a list of entries
190 * \param uc_mgr Use case manager (may be NULL - card list)
191 * \param identifier (may be NULL - card list)
192 * \param list Returned allocated list
193 * \return Number of list entries if success, otherwise a negative error code
195 * Defined identifiers:
196 * NULL - get card list
197 * (in pair cardname+comment)
198 * _verbs - get verb list
199 * (in pair verb+comment)
200 * _devices[/<verb>] - get list of supported devices
201 * (in pair device+comment)
202 * _modifiers[/<verb>]- get list of supported modifiers
203 * (in pair modifier+comment)
204 * TQ[/<verb>] - get list of TQ identifiers
205 * _enadevs - get list of enabled devices
206 * _enamods - get list of enabled modifiers
208 * _supporteddevs/<modifier>|<device>[/<verb>] - list of supported devices
209 * _conflictingdevs/<modifier>|<device>[/<verb>] - list of conflicting devices
210 * Note that at most one of the supported/conflicting devs lists has
211 * any entries, and when neither is present, all devices are supported.
214 int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr,
215 const char *identifier,
216 const char **list[]);
220 * \brief Get current - string
221 * \param uc_mgr Use case manager
223 * \param value Value pointer
224 * \return Zero if success, otherwise a negative error code
226 * Note: String is dynamically allocated, use free() to
227 * deallocate this string.
230 * NULL - return current card
231 * _verb - return current verb
233 * [=]<NAME>[/[<modifier>|</device>][/<verb>]]
234 * - value identifier <NAME>
235 * - Search starts at given modifier or device if any,
237 * - Search starts at given verb if any,
239 * - Searches modifier/device, then verb, then defaults
240 * - Specify a leading "=" to search only the exact
241 * device/modifier/verb specified, and not search
242 * through each object in turn.
244 * "PlaybackPCM/Play Music"
246 * From ValueDefaults only:
248 * From current active verb:
252 * From "Modifier" in current active verb:
253 * "=Variable/Modifier/"
254 * From "Modifier" in "Verb":
255 * "=Variable/Modifier/Verb"
257 * Recommended names for values:
259 * PlaybackPCM - full PCM playback device name
260 * CapturePCM - full PCM capture device name
261 * PlaybackCTL - playback control device name
262 * PlaybackVolume - playback control volume ID string
263 * PlaybackSwitch - playback control switch ID string
264 * CaptureCTL - capture control device name
265 * CaptureVolume - capture control volume ID string
266 * CaptureSwitch - capture control switch ID string
267 * PlaybackMixer - name of playback mixer
268 * PlaybackMixerID - mixer playback ID
269 * CaptureMixer - name of capture mixer
270 * CaptureMixerID - mixer capture ID
272 int snd_use_case_get(snd_use_case_mgr_t *uc_mgr,
273 const char *identifier,
277 * \brief Get current - integer
278 * \param uc_mgr Use case manager
280 * \param value result
281 * \return Zero if success, otherwise a negative error code
284 * _devstatus/<device> - return status for given device
285 * _modstatus/<modifier> - return status for given modifier
287 int snd_use_case_geti(snd_use_case_mgr_t *uc_mgr,
288 const char *identifier,
293 * \param uc_mgr Use case manager
296 * \return Zero if success, otherwise a negative error code
299 * _verb - set current verb = value
300 * _enadev - enable given device = value
301 * _disdev - disable given device = value
302 * _swdev/<old_device> - new_device = value
303 * - disable old_device and then enable new_device
304 * - if old_device is not enabled just return
305 * - check transmit sequence firstly
306 * _enamod - enable given modifier = value
307 * _dismod - disable given modifier = value
308 * _swmod/<old_modifier> - new_modifier = value
309 * - disable old_modifier and then enable new_modifier
310 * - if old_modifier is not enabled just return
311 * - check transmit sequence firstly
313 int snd_use_case_set(snd_use_case_mgr_t *uc_mgr,
314 const char *identifier,
318 * \brief Open and initialise use case core for sound card
319 * \param uc_mgr Returned use case manager pointer
320 * \param card_name Sound card name.
321 * \return zero if success, otherwise a negative error code
323 int snd_use_case_mgr_open(snd_use_case_mgr_t **uc_mgr, const char *card_name);
327 * \brief Reload and re-parse use case configuration files for sound card.
328 * \param uc_mgr Use case manager
329 * \return zero if success, otherwise a negative error code
331 int snd_use_case_mgr_reload(snd_use_case_mgr_t *uc_mgr);
334 * \brief Close use case manager
335 * \param uc_mgr Use case manager
336 * \return zero if success, otherwise a negative error code
338 int snd_use_case_mgr_close(snd_use_case_mgr_t *uc_mgr);
341 * \brief Reset use case manager verb, device, modifier to deafult settings.
342 * \param uc_mgr Use case manager
343 * \return zero if success, otherwise a negative error code
345 int snd_use_case_mgr_reset(snd_use_case_mgr_t *uc_mgr);
352 * \brief Obtain a list of cards
353 * \param list Returned allocated list
354 * \return Number of list entries if success, otherwise a negative error code
356 static inline int snd_use_case_card_list(const char **list[])
358 return snd_use_case_get_list(NULL, NULL, list);
362 * \brief Obtain a list of verbs
363 * \param uc_mgr Use case manager
364 * \param list Returned list of verbs
365 * \return Number of list entries if success, otherwise a negative error code
367 static inline int snd_use_case_verb_list(snd_use_case_mgr_t *uc_mgr,
370 return snd_use_case_get_list(uc_mgr, "_verbs", list);
381 #endif /* __ALSA_USE_CASE_H */