eaf6cbe099
This adds bi-directional (host->device, device->host) volume/mute support to the f_uac2 driver by adding Feature Units and interrupt endpoint. Currently only master channel is supported. Volume and mute are configurable through configfs, by default volume has -100..0 dB range with 1 dB step. Similar to existing flexible endpoints configuration, Feature Unit won't be added to the topology if both mute and volume are not enabled, also interrupt endpoint isn't added to the device if no feature unit is present Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com> Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com> Link: https://lore.kernel.org/r/20210712125529.76070-4-pavel.hofman@ivitera.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* u_uac2.h
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*
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* Utility definitions for UAC2 function
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*
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* Copyright (c) 2014 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
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*/
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#ifndef U_UAC2_H
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#define U_UAC2_H
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#include <linux/usb/composite.h>
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#define UAC2_DEF_PCHMASK 0x3
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#define UAC2_DEF_PSRATE 48000
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#define UAC2_DEF_PSSIZE 2
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#define UAC2_DEF_CCHMASK 0x3
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#define UAC2_DEF_CSRATE 64000
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#define UAC2_DEF_CSSIZE 2
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#define UAC2_DEF_CSYNC USB_ENDPOINT_SYNC_ASYNC
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#define UAC2_DEF_MUTE_PRESENT 1
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#define UAC2_DEF_VOLUME_PRESENT 1
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#define UAC2_DEF_MIN_DB (-100*256) /* -100 dB */
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#define UAC2_DEF_MAX_DB 0 /* 0 dB */
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#define UAC2_DEF_RES_DB (1*256) /* 1 dB */
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#define UAC2_DEF_REQ_NUM 2
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#define UAC2_DEF_FB_MAX 5
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#define UAC2_DEF_INT_REQ_NUM 10
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struct f_uac2_opts {
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struct usb_function_instance func_inst;
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int p_chmask;
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int p_srate;
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int p_ssize;
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int c_chmask;
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int c_srate;
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int c_ssize;
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int c_sync;
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bool p_mute_present;
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bool p_volume_present;
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s16 p_volume_min;
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s16 p_volume_max;
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s16 p_volume_res;
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bool c_mute_present;
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bool c_volume_present;
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s16 c_volume_min;
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s16 c_volume_max;
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s16 c_volume_res;
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int req_number;
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int fb_max;
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bool bound;
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struct mutex lock;
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int refcnt;
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};
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#endif
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