linux/sound/usb/mixer.h
Takashi Iwai a6cece9d81 ALSA: usb-audio: Pass direct struct pointer instead of list_head
Some functions in mixer.c and endpoint.c receive list_head instead of
the object itself.  This is not obvious and rather error-prone.  Let's
pass the proper object directly instead.

The functions in midi.c still receive list_head and this can't be
changed since the object definition isn't exposed to the outside of
midi.c, so left as is.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-11-04 15:09:10 +01:00

79 lines
2.1 KiB
C

#ifndef __USBMIXER_H
#define __USBMIXER_H
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_info **id_elems;
/* the usb audio specification version this interface complies to */
int protocol;
/* 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];
u8 audigy2nx_leds[3];
u8 xonar_u1_status;
};
#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,
};
struct usb_mixer_elem_info {
struct usb_mixer_interface *mixer;
struct usb_mixer_elem_info *next_id_elem; /* list of controls with same id */
struct snd_ctl_elem_id *elem_id;
unsigned int id;
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;
};
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_control(struct usb_mixer_interface *mixer,
struct snd_kcontrol *kctl);
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
#endif /* __USBMIXER_H */