Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0
2 *
3 * Copyright (c) 2022-2025 Qualcomm Innovation Center, Inc. All rights reserved.
4 */
5
6#ifndef __LINUX_SND_SOC_USB_H
7#define __LINUX_SND_SOC_USB_H
8
9#include <sound/soc.h>
10
11enum snd_soc_usb_kctl {
12 SND_SOC_USB_KCTL_CARD_ROUTE,
13 SND_SOC_USB_KCTL_PCM_ROUTE,
14};
15
16/**
17 * struct snd_soc_usb_device - SoC USB representation of a USB sound device
18 * @card_idx: sound card index associated with USB device
19 * @chip_idx: USB sound chip array index
20 * @cpcm_idx: capture PCM index array associated with USB device
21 * @ppcm_idx: playback PCM index array associated with USB device
22 * @num_capture: number of capture streams
23 * @num_playback: number of playback streams
24 * @list: list head for SoC USB devices
25 **/
26struct snd_soc_usb_device {
27 int card_idx;
28 int chip_idx;
29
30 /* PCM index arrays */
31 unsigned int *cpcm_idx; /* TODO: capture path is not tested yet */
32 unsigned int *ppcm_idx;
33 int num_capture; /* TODO: capture path is not tested yet */
34 int num_playback;
35
36 struct list_head list;
37};
38
39/**
40 * struct snd_soc_usb - representation of a SoC USB backend entity
41 * @list: list head for SND SOC struct list
42 * @component: reference to ASoC component
43 * @connection_status_cb: callback to notify connection events
44 * @update_offload_route_info: callback to fetch mapped ASoC card and pcm
45 * device pair. This is unrelated to the concept
46 * of DAPM route. The "route" argument carries
47 * an array used for a kcontrol output for either
48 * the card or pcm index. "path" determines the
49 * which entry to look for. (ie mapped card or pcm)
50 * @priv_data: driver data
51 **/
52struct snd_soc_usb {
53 struct list_head list;
54 struct snd_soc_component *component;
55 int (*connection_status_cb)(struct snd_soc_usb *usb,
56 struct snd_soc_usb_device *sdev,
57 bool connected);
58 int (*update_offload_route_info)(struct snd_soc_component *component,
59 int card, int pcm, int direction,
60 enum snd_soc_usb_kctl path,
61 long *route);
62 void *priv_data;
63};
64
65#if IS_ENABLED(CONFIG_SND_SOC_USB)
66int snd_soc_usb_find_supported_format(int card_idx,
67 struct snd_pcm_hw_params *params,
68 int direction);
69
70int snd_soc_usb_connect(struct device *usbdev, struct snd_soc_usb_device *sdev);
71int snd_soc_usb_disconnect(struct device *usbdev, struct snd_soc_usb_device *sdev);
72void *snd_soc_usb_find_priv_data(struct device *usbdev);
73
74int snd_soc_usb_setup_offload_jack(struct snd_soc_component *component,
75 struct snd_soc_jack *jack);
76int snd_soc_usb_update_offload_route(struct device *dev, int card, int pcm,
77 int direction, enum snd_soc_usb_kctl path,
78 long *route);
79
80struct snd_soc_usb *snd_soc_usb_allocate_port(struct snd_soc_component *component,
81 void *data);
82void snd_soc_usb_free_port(struct snd_soc_usb *usb);
83void snd_soc_usb_add_port(struct snd_soc_usb *usb);
84void snd_soc_usb_remove_port(struct snd_soc_usb *usb);
85#else
86static inline int
87snd_soc_usb_find_supported_format(int card_idx, struct snd_pcm_hw_params *params,
88 int direction)
89{
90 return -EINVAL;
91}
92
93static inline int snd_soc_usb_connect(struct device *usbdev,
94 struct snd_soc_usb_device *sdev)
95{
96 return -ENODEV;
97}
98
99static inline int snd_soc_usb_disconnect(struct device *usbdev,
100 struct snd_soc_usb_device *sdev)
101{
102 return -EINVAL;
103}
104
105static inline void *snd_soc_usb_find_priv_data(struct device *usbdev)
106{
107 return NULL;
108}
109
110static inline int snd_soc_usb_setup_offload_jack(struct snd_soc_component *component,
111 struct snd_soc_jack *jack)
112{
113 return 0;
114}
115
116static int snd_soc_usb_update_offload_route(struct device *dev, int card, int pcm,
117 int direction, enum snd_soc_usb_kctl path,
118 long *route)
119{
120 return -ENODEV;
121}
122
123static inline struct snd_soc_usb *
124snd_soc_usb_allocate_port(struct snd_soc_component *component, void *data)
125{
126 return ERR_PTR(-ENOMEM);
127}
128
129static inline void snd_soc_usb_free_port(struct snd_soc_usb *usb)
130{ }
131
132static inline void snd_soc_usb_add_port(struct snd_soc_usb *usb)
133{ }
134
135static inline void snd_soc_usb_remove_port(struct snd_soc_usb *usb)
136{ }
137#endif /* IS_ENABLED(CONFIG_SND_SOC_USB) */
138#endif /*__LINUX_SND_SOC_USB_H */