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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Rong ZhangandTakashi Iwai
ad2c7d2c42
Since commit 86aa1ea1f1 ("ALSA: usb-audio: Do not expose sticky
mixers"), the UAC mixer core utilizes volume SET_CUR and GET_CUR to
identify devices with sticky mixers. Unfortunately, even though most
devices with sticky GET_CUR also have corresponding sticky SET_CUR,
which I actually met more since the commit had been merged, there is
also a rare case that some devices may have volume mixers that responds
to SET_CUR properly but with its GET_CUR stubbed. This cause the sticky
check to consider the mixer to be sticky and unnecessarily disable it.
As the sticky check can't distinguish between sticky mixers and working
SET_CUR but broken GET_CUR, add QUIRK_FLAG_MIXER_GET_CUR_BROKEN to tell
that the device should fall into the second category when GET_CUR
returns a constant value. In this case, the sticky check becomes
non-fatal and only disables GET_CUR instead of the whole mixer. The
current volume will then be provided by the internal cache that stores
the last set volume.
An info message prompting users to check MIXER_GET_CUR_BROKEN for
potential sticky mixers is also added, so that users can learn how to do
some experiments to determine what's going on. If the mixer surprisingly
turns out to be non-sticky, they can submit a patch for a new quirk
table entry.
Signed-off-by: Rong Zhang <i@rong.moe>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260531-uac-quirk-get-cur-vol-v4-1-ede643dca151@rong.moe
137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __USBMIXER_H
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#define __USBMIXER_H
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#include <sound/info.h>
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struct media_mixer_ctl;
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struct usbmix_connector_map {
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u8 id;
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u8 delegated_id;
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u8 control;
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u8 channel;
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};
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struct usb_mixer_interface {
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struct snd_usb_audio *chip;
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struct usb_host_interface *hostif;
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struct list_head list;
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unsigned int ignore_ctl_error;
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struct urb *urb;
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/* array[MAX_ID_ELEMS], indexed by unit id */
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struct usb_mixer_elem_list **id_elems;
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/* the usb audio specification version this interface complies to */
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int protocol;
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/* optional connector delegation map */
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const struct usbmix_connector_map *connector_map;
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/* Sound Blaster remote control stuff */
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const struct rc_config *rc_cfg;
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u32 rc_code;
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wait_queue_head_t rc_waitq;
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struct urb *rc_urb;
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struct usb_ctrlrequest *rc_setup_packet;
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u8 rc_buffer[6];
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struct media_mixer_ctl *media_mixer_ctl;
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bool disconnected;
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void *private_data;
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void (*private_free)(struct usb_mixer_interface *mixer);
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void (*private_suspend)(struct usb_mixer_interface *mixer);
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};
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#define MAX_CHANNELS 64 /* max logical channels */
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enum {
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USB_MIXER_BOOLEAN,
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USB_MIXER_INV_BOOLEAN,
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USB_MIXER_S8,
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USB_MIXER_U8,
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USB_MIXER_S16,
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USB_MIXER_U16,
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USB_MIXER_S32,
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USB_MIXER_U32,
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USB_MIXER_BESPOKEN, /* non-standard type */
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};
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typedef void (*usb_mixer_elem_dump_func_t)(struct snd_info_buffer *buffer,
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struct usb_mixer_elem_list *list);
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typedef int (*usb_mixer_elem_resume_func_t)(struct usb_mixer_elem_list *elem);
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struct usb_mixer_elem_list {
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struct usb_mixer_interface *mixer;
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struct usb_mixer_elem_list *next_id_elem; /* list of controls with same id */
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struct snd_kcontrol *kctl;
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unsigned int id;
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bool is_std_info;
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usb_mixer_elem_dump_func_t dump;
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usb_mixer_elem_resume_func_t resume;
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};
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/* iterate over mixer element list of the given unit id */
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#define for_each_mixer_elem(list, mixer, id) \
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for ((list) = (mixer)->id_elems[id]; (list); (list) = (list)->next_id_elem)
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#define mixer_elem_list_to_info(list) \
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container_of(list, struct usb_mixer_elem_info, head)
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struct usb_mixer_elem_info {
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struct usb_mixer_elem_list head;
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unsigned int control; /* CS or ICN (high byte) */
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u64 cmask; /* channel mask bitmap: 0 = master */
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unsigned int idx_off; /* Control index offset */
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unsigned int ch_readonly;
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unsigned int master_readonly;
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int channels;
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int val_type;
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int min, max, res;
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int max_exposed; /* control API exposes the value in 0..max_exposed */
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int dBmin, dBmax;
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int cached;
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int cache_val[MAX_CHANNELS];
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u8 initialized;
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u8 min_mute;
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u8 get_cur_broken;
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void *private_data;
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};
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int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif);
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void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer);
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void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid);
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int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
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int request, int validx, int value_set);
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int snd_usb_mixer_add_list(struct usb_mixer_elem_list *list,
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struct snd_kcontrol *kctl,
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bool is_std_info);
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#define snd_usb_mixer_add_control(list, kctl) \
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snd_usb_mixer_add_list(list, kctl, true)
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void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
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struct usb_mixer_interface *mixer,
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int unitid);
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int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
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unsigned int size, unsigned int __user *_tlv);
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int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer);
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int snd_usb_mixer_resume(struct usb_mixer_interface *mixer);
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int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
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int index, int value);
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int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
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int channel, int index, int *value);
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extern void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl);
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extern const struct snd_kcontrol_new *snd_usb_feature_unit_ctl;
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#endif /* __USBMIXER_H */
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