19 /* Represents an ALSA control element. Each device can have several of these,
22  * has_volume - non-zero indicates there is a volume control.
24  * max_volume_dB - the maximum volume for this control, or
26  * min_volume_dB - the minimum volume for this control, or
38 /* Represents an ALSA control element related to a specific input/output
43  * are separate control elements for left/right channels (for example),
49  * name - Name of the control (typicially this is the same as the name of the
52  * dir - Control direction, OUTPUT or INPUT only.
53  * elements - The mixer_control_elements that are driven by this control.
54  * has_volume - non-zero indicates there is a volume control.
56  * max_volume_dB - Maximum volume available in the volume control.
57  * min_volume_dB - Minimum volume available in the volume control.
176 static void mixer_control_destroy(struct mixer_control *control) {  in mixer_control_destroy()  argument
179 	if (!control)  in mixer_control_destroy()
182 	DL_FOREACH(control->elements, elem) {  in mixer_control_destroy()
183 		DL_DELETE(control->elements, elem);  in mixer_control_destroy()
186 	if (control->name)  in mixer_control_destroy()
187 		free((void *)control->name);  in mixer_control_destroy()
188 	free(control);  in mixer_control_destroy()
193 	struct mixer_control *control;  in mixer_control_destroy_list()  local
196 	DL_FOREACH(control_list, control) {  in mixer_control_destroy_list()
197 		DL_DELETE(control_list, control);  in mixer_control_destroy_list()
198 		mixer_control_destroy(control);  in mixer_control_destroy_list()
202 static int mixer_control_add_element(struct mixer_control *control,  in mixer_control_add_element()  argument
207 	if (!control)  in mixer_control_add_element()
210 	elem = mixer_control_element_create(snd_elem, control->dir);  in mixer_control_add_element()
214 	DL_APPEND(control->elements, elem);  in mixer_control_add_element()
217 		if (!control->has_volume)  in mixer_control_add_element()
218 			control->has_volume = 1;  in mixer_control_add_element()
223 		if (control->min_volume_dB ==  in mixer_control_add_element()
225 			control->min_volume_dB = elem->min_volume_dB;  in mixer_control_add_element()
226 			control->max_volume_dB = elem->max_volume_dB;  in mixer_control_add_element()
227 		} else if (control->min_volume_dB != elem->min_volume_dB ||  in mixer_control_add_element()
228 			   control->max_volume_dB != elem->max_volume_dB) {  in mixer_control_add_element()
230 			    "Element '%s' of control '%s' has different"  in mixer_control_add_element()
233 			    control->name,  in mixer_control_add_element()
235 			    control->min_volume_dB, control->max_volume_dB);  in mixer_control_add_element()
239 	if (elem->has_mute && !control->has_mute)  in mixer_control_add_element()
240 		control->has_mute = 1;  in mixer_control_add_element()
244 static int mixer_control_create(struct mixer_control **control,  in mixer_control_create()  argument
252 	if (!control)  in mixer_control_create()
269 		syslog(LOG_ERR, "Control does not have a name.");  in mixer_control_create()
276 		syslog(LOG_ERR, "No memory for control's name: %s", name);  in mixer_control_create()
284 	*control = c;  in mixer_control_create()
289 	*control = NULL;  in mixer_control_create()
296  *    control[out] - Storage for resulting pointer to mixer_control.
298  *    name[in] - Optional name of the control. Input NULL to take the name of
300  *    mixer_names[in] - Names of the ASLA mixer control elements. Must not
302  *    dir[in] - Control direction: CRAS_STREAM_OUTPUT or CRAS_STREAM_INPUT.
304  *    Returns 0 for success, negative error code otherwise. *control is
308 		struct mixer_control **control,  in mixer_control_create_by_name()  argument
320 	if (!control)  in mixer_control_create_by_name()
322 	*control = NULL;  in mixer_control_create_by_name()
344 			syslog(LOG_ERR, "Unable to find simple control %s, 0",  in mixer_control_create_by_name()
357 	*control = c;  in mixer_control_create_by_name()
362 		const struct mixer_control *control, long to_set)  in mixer_control_set_dBFS()  argument
366 	if (!control)  in mixer_control_set_dBFS()
368 	DL_FOREACH(control->elements, elem) {  in mixer_control_set_dBFS()
370 			if (control->dir == CRAS_STREAM_OUTPUT)  in mixer_control_set_dBFS()
373 			else if (control->dir == CRAS_STREAM_INPUT)  in mixer_control_set_dBFS()
379 			       control->name,  in mixer_control_set_dBFS()
386 		       control->name,  in mixer_control_set_dBFS()
393 		const struct mixer_control *control, long *to_get)  in mixer_control_get_dBFS()  argument
397 	if (!control || !to_get)  in mixer_control_get_dBFS()
399 	DL_FOREACH(control->elements, elem) {  in mixer_control_get_dBFS()
401 			if (control->dir == CRAS_STREAM_OUTPUT)  in mixer_control_get_dBFS()
406 			else if (control->dir == CRAS_STREAM_INPUT)  in mixer_control_get_dBFS()
411 			/* Assume all of the elements of this control have  in mixer_control_get_dBFS()
418 		       control->name,  in mixer_control_get_dBFS()
425 		const struct mixer_control *control, int muted)  in mixer_control_set_mute()  argument
429 	if (!control)  in mixer_control_set_mute()
431 	DL_FOREACH(control->elements, elem) {  in mixer_control_set_mute()
433 			if (control->dir == CRAS_STREAM_OUTPUT)  in mixer_control_set_mute()
436 			else if (control->dir == CRAS_STREAM_INPUT)  in mixer_control_set_mute()
445 		       control->name,  in mixer_control_set_mute()
451 /* Adds the main volume control to the list and grabs the first seen playback
474 		syslog(LOG_DEBUG, "Add main volume control %s\n", c->name);  in add_main_volume_control()
490 /* Adds the main capture control to the list and grabs the first seen capture
505 		syslog(LOG_DEBUG, "Add main capture control %s\n", c->name);  in add_main_capture_control()
521 /* Adds a control to the list. */
532 	syslog(LOG_DEBUG, "Add %s control: %s,%d\n",  in add_control_with_name()
541 		syslog(LOG_DEBUG, "Control '%s' volume range: [%ld:%ld]",  in add_control_with_name()
563 	struct mixer_control *control;  in list_controls()  local
565 	DL_FOREACH(control_list, control)  in list_controls()
566 		cb(control, cb_arg);  in list_controls()
582 /* Creates a mixer_control with multiple control elements. */
596 	syslog(LOG_DEBUG, "Add %s control: %s\n",  in add_control_with_coupled_mixers()
602 		syslog(LOG_DEBUG, "Control '%s' volume range: [%ld:%ld]",  in add_control_with_coupled_mixers()
628 	syslog(LOG_DEBUG, "Add %s control: %s\n",  in add_control_by_name()
633 		syslog(LOG_DEBUG, "Control '%s' volume range: [%ld:%ld]",  in add_control_by_name()
727 		struct mixer_name *control;  in cras_alsa_mixer_add_controls_by_name_matching()  local
734 		/* Find a matching control. */  in cras_alsa_mixer_add_controls_by_name_matching()
735 		control = mixer_name_find(default_controls, name,  in cras_alsa_mixer_add_controls_by_name_matching()
743 		    control && control->type == MIXER_NAME_MAIN_VOLUME)  in cras_alsa_mixer_add_controls_by_name_matching()
744 			control = NULL;  in cras_alsa_mixer_add_controls_by_name_matching()
748 		if (!control)  in cras_alsa_mixer_add_controls_by_name_matching()
749 			control = mixer_name_find(extra_controls, name,  in cras_alsa_mixer_add_controls_by_name_matching()
753 		if (control) {  in cras_alsa_mixer_add_controls_by_name_matching()
755 			switch(control->type) {  in cras_alsa_mixer_add_controls_by_name_matching()
770 				       "Failed to add mixer control '%s'"  in cras_alsa_mixer_add_controls_by_name_matching()
772 				       control->name, control->type);  in cras_alsa_mixer_add_controls_by_name_matching()
778 		/* Find a matching input control. */  in cras_alsa_mixer_add_controls_by_name_matching()
779 		control = mixer_name_find(default_controls, name,  in cras_alsa_mixer_add_controls_by_name_matching()
785 		if (!control)  in cras_alsa_mixer_add_controls_by_name_matching()
786 			control = mixer_name_find(extra_controls, name,  in cras_alsa_mixer_add_controls_by_name_matching()
790 		if (control) {  in cras_alsa_mixer_add_controls_by_name_matching()
792 			switch(control->type) {  in cras_alsa_mixer_add_controls_by_name_matching()
806 				       "Failed to add mixer control '%s'"  in cras_alsa_mixer_add_controls_by_name_matching()
808 				       control->name, control->type);  in cras_alsa_mixer_add_controls_by_name_matching()
817 			 * control and the largest volume range. */  in cras_alsa_mixer_add_controls_by_name_matching()
843 	/* If there is no volume control and output control found,  in cras_alsa_mixer_add_controls_by_name_matching()
844 	 * use the volume control which has the largest volume range  in cras_alsa_mixer_add_controls_by_name_matching()
845 	 * in the mixer as a main volume control. */  in cras_alsa_mixer_add_controls_by_name_matching()
850 			syslog(LOG_ERR, "Could not add other volume control");  in cras_alsa_mixer_add_controls_by_name_matching()
883 			syslog(LOG_ERR, "Could not add mixer control '%s': %s",  in cras_alsa_mixer_add_controls_in_section()
894 			syslog(LOG_ERR, "Could not add coupled control: %s",  in cras_alsa_mixer_add_controls_in_section()
943 	 * entire volume can't be set on the current control, move on to the  in cras_alsa_mixer_set_dBFS()
956 	/* Apply the rest to the output-specific control. */  in cras_alsa_mixer_set_dBFS()
988 	 * be set on the current control, move on to the next one until we have  in cras_alsa_mixer_set_capture_dBFS()
1001 	/* Apply the reset to input specific control */  in cras_alsa_mixer_set_capture_dBFS()
1089 		const struct mixer_control *control)  in cras_alsa_mixer_get_control_name()  argument
1091 	if (!control)  in cras_alsa_mixer_get_control_name()
1093 	return control->name;  in cras_alsa_mixer_get_control_name()
1117 	/* TODO: Allowing creation of a new control is a workaround: we  in cras_alsa_mixer_get_control_matching_name()
1157 	/* TODO: Allowing creation of a new control is a workaround: we  in cras_alsa_mixer_get_input_matching_name()