1 files changed, 129 insertions, 0 deletions
diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
new file mode 100644
index 000000000..f7e6fe1a9
--- /dev/null
+++ b/sound/usb/mixer.h
@@ -0,0 +1,129 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __USBMIXER_H
+#define __USBMIXER_H
+
+#include <sound/info.h>
+
+struct usbmix_connector_map {
+	u8 id;
+	u8 delegated_id;
+	u8 control;
+	u8 channel;
+};
+
+struct usb_mixer_interface {
+	struct snd_usb_audio *chip;
+	struct usb_host_interface *hostif;
+	struct list_head list;
+	unsigned int ignore_ctl_error;
+	struct urb *urb;
+	/* array[MAX_ID_ELEMS], indexed by unit id */
+	struct usb_mixer_elem_list **id_elems;
+
+	/* the usb audio specification version this interface complies to */
+	int protocol;
+
+	/* optional connector delegation map */
+	const struct usbmix_connector_map *connector_map;
+
+	/* Sound Blaster remote control stuff */
+	const struct rc_config *rc_cfg;
+	u32 rc_code;
+	wait_queue_head_t rc_waitq;
+	struct urb *rc_urb;
+	struct usb_ctrlrequest *rc_setup_packet;
+	u8 rc_buffer[6];
+
+	bool disconnected;
+};
+
+#define MAX_CHANNELS	16	/* max logical channels */
+
+enum {
+	USB_MIXER_BOOLEAN,
+	USB_MIXER_INV_BOOLEAN,
+	USB_MIXER_S8,
+	USB_MIXER_U8,
+	USB_MIXER_S16,
+	USB_MIXER_U16,
+	USB_MIXER_S32,
+	USB_MIXER_U32,
+};
+
+typedef void (*usb_mixer_elem_dump_func_t)(struct snd_info_buffer *buffer,
+					 struct usb_mixer_elem_list *list);
+typedef int (*usb_mixer_elem_resume_func_t)(struct usb_mixer_elem_list *elem);
+
+struct usb_mixer_elem_list {
+	struct usb_mixer_interface *mixer;
+	struct usb_mixer_elem_list *next_id_elem; /* list of controls with same id */
+	struct snd_kcontrol *kctl;
+	unsigned int id;
+	bool is_std_info;
+	usb_mixer_elem_dump_func_t dump;
+	usb_mixer_elem_resume_func_t resume;
+};
+
+/* iterate over mixer element list of the given unit id */
+#define for_each_mixer_elem(list, mixer, id)	\
+	for ((list) = (mixer)->id_elems[id]; (list); (list) = (list)->next_id_elem)
+#define mixer_elem_list_to_info(list) \
+	container_of(list, struct usb_mixer_elem_info, head)
+
+struct usb_mixer_elem_info {
+	struct usb_mixer_elem_list head;
+	unsigned int control;	/* CS or ICN (high byte) */
+	unsigned int cmask; /* channel mask bitmap: 0 = master */
+	unsigned int idx_off; /* Control index offset */
+	unsigned int ch_readonly;
+	unsigned int master_readonly;
+	int channels;
+	int val_type;
+	int min, max, res;
+	int dBmin, dBmax;
+	int cached;
+	int cache_val[MAX_CHANNELS];
+	u8 initialized;
+	u8 min_mute;
+	void *private_data;
+};
+
+int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
+			 int ignore_error);
+void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer);
+
+void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid);
+
+int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
+				int request, int validx, int value_set);
+
+int snd_usb_mixer_add_list(struct usb_mixer_elem_list *list,
+			   struct snd_kcontrol *kctl,
+			   bool is_std_info);
+
+#define snd_usb_mixer_add_control(list, kctl) \
+	snd_usb_mixer_add_list(list, kctl, true)
+
+void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
+				 struct usb_mixer_interface *mixer,
+				 int unitid);
+
+int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
+			  unsigned int size, unsigned int __user *_tlv);
+
+#ifdef CONFIG_PM
+int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer);
+int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume);
+#endif
+
+int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
+                             int index, int value);
+
+int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
+                             int channel, int index, int *value);
+
+extern void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl);
+
+extern struct snd_kcontrol_new *snd_usb_feature_unit_ctl;
+
+#endif /* __USBMIXER_H */