mirror of https://gitee.com/openkylin/linux.git
803 lines
22 KiB
C
803 lines
22 KiB
C
/*
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* f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API)
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*
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* Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
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*
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* This driver doesn't expect any real Audio codec to be present
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* on the device - the audio streams are simply sinked to and
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* sourced from a virtual ALSA sound card created.
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*
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* This file is based on f_uac1.c which is
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* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
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* Copyright (C) 2008 Analog Devices, Inc
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/usb/audio.h>
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#include <linux/module.h>
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#include "u_audio.h"
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#include "u_uac1.h"
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struct f_uac1 {
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struct g_audio g_audio;
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u8 ac_intf, as_in_intf, as_out_intf;
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u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
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};
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static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
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{
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return container_of(f, struct f_uac1, g_audio.func);
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}
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/*
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* DESCRIPTORS ... most are static, but strings and full
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* configuration descriptors are built on demand.
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*/
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/*
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* We have three interfaces - one AudioControl and two AudioStreaming
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*
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* The driver implements a simple UAC_1 topology.
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* USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture
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* ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
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*/
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#define F_AUDIO_AC_INTERFACE 0
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#define F_AUDIO_AS_OUT_INTERFACE 1
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#define F_AUDIO_AS_IN_INTERFACE 2
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/* Number of streaming interfaces */
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#define F_AUDIO_NUM_INTERFACES 2
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/* B.3.1 Standard AC Interface Descriptor */
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static struct usb_interface_descriptor ac_interface_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
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};
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/*
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* The number of AudioStreaming and MIDIStreaming interfaces
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* in the Audio Interface Collection
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*/
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DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
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#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
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/* 2 input terminals and 2 output terminals */
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#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \
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+ 2*UAC_DT_INPUT_TERMINAL_SIZE + 2*UAC_DT_OUTPUT_TERMINAL_SIZE)
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/* B.3.2 Class-Specific AC Interface Descriptor */
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static struct uac1_ac_header_descriptor_2 ac_header_desc = {
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.bLength = UAC_DT_AC_HEADER_LENGTH,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = UAC_HEADER,
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.bcdADC = cpu_to_le16(0x0100),
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.wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH),
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.bInCollection = F_AUDIO_NUM_INTERFACES,
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.baInterfaceNr = {
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/* Interface number of the AudioStream interfaces */
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[0] = 1,
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[1] = 2,
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}
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};
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#define USB_OUT_IT_ID 1
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static struct uac_input_terminal_descriptor usb_out_it_desc = {
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.bLength = UAC_DT_INPUT_TERMINAL_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = UAC_INPUT_TERMINAL,
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.bTerminalID = USB_OUT_IT_ID,
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.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
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.bAssocTerminal = 0,
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.wChannelConfig = cpu_to_le16(0x3),
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};
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#define IO_OUT_OT_ID 2
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static struct uac1_output_terminal_descriptor io_out_ot_desc = {
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.bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
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.bTerminalID = IO_OUT_OT_ID,
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.wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
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.bAssocTerminal = 0,
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.bSourceID = USB_OUT_IT_ID,
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};
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#define IO_IN_IT_ID 3
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static struct uac_input_terminal_descriptor io_in_it_desc = {
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.bLength = UAC_DT_INPUT_TERMINAL_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = UAC_INPUT_TERMINAL,
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.bTerminalID = IO_IN_IT_ID,
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.wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
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.bAssocTerminal = 0,
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.wChannelConfig = cpu_to_le16(0x3),
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};
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#define USB_IN_OT_ID 4
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static struct uac1_output_terminal_descriptor usb_in_ot_desc = {
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.bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
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.bTerminalID = USB_IN_OT_ID,
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.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
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.bAssocTerminal = 0,
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.bSourceID = IO_IN_IT_ID,
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};
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/* B.4.1 Standard AS Interface Descriptor */
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static struct usb_interface_descriptor as_out_interface_alt_0_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bAlternateSetting = 0,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
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};
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static struct usb_interface_descriptor as_out_interface_alt_1_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bAlternateSetting = 1,
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.bNumEndpoints = 1,
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
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};
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static struct usb_interface_descriptor as_in_interface_alt_0_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bAlternateSetting = 0,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
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};
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static struct usb_interface_descriptor as_in_interface_alt_1_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bAlternateSetting = 1,
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.bNumEndpoints = 1,
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
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};
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/* B.4.2 Class-Specific AS Interface Descriptor */
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static struct uac1_as_header_descriptor as_out_header_desc = {
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.bLength = UAC_DT_AS_HEADER_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = UAC_AS_GENERAL,
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.bTerminalLink = USB_OUT_IT_ID,
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.bDelay = 1,
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.wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
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};
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static struct uac1_as_header_descriptor as_in_header_desc = {
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.bLength = UAC_DT_AS_HEADER_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = UAC_AS_GENERAL,
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.bTerminalLink = USB_IN_OT_ID,
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.bDelay = 1,
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.wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
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};
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DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
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static struct uac_format_type_i_discrete_descriptor_1 as_out_type_i_desc = {
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.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = UAC_FORMAT_TYPE,
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.bFormatType = UAC_FORMAT_TYPE_I,
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.bSubframeSize = 2,
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.bBitResolution = 16,
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.bSamFreqType = 1,
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};
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/* Standard ISO OUT Endpoint Descriptor */
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static struct usb_endpoint_descriptor as_out_ep_desc = {
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.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
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| USB_ENDPOINT_XFER_ISOC,
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.wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
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.bInterval = 4,
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};
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/* Class-specific AS ISO OUT Endpoint Descriptor */
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static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
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.bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
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.bDescriptorType = USB_DT_CS_ENDPOINT,
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.bDescriptorSubtype = UAC_EP_GENERAL,
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.bmAttributes = 1,
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.bLockDelayUnits = 1,
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.wLockDelay = cpu_to_le16(1),
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};
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static struct uac_format_type_i_discrete_descriptor_1 as_in_type_i_desc = {
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.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = UAC_FORMAT_TYPE,
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.bFormatType = UAC_FORMAT_TYPE_I,
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.bSubframeSize = 2,
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.bBitResolution = 16,
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.bSamFreqType = 1,
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};
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/* Standard ISO OUT Endpoint Descriptor */
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static struct usb_endpoint_descriptor as_in_ep_desc = {
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.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_SYNC_ASYNC
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| USB_ENDPOINT_XFER_ISOC,
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.wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
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.bInterval = 4,
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};
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/* Class-specific AS ISO OUT Endpoint Descriptor */
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static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
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.bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
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.bDescriptorType = USB_DT_CS_ENDPOINT,
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.bDescriptorSubtype = UAC_EP_GENERAL,
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.bmAttributes = 1,
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.bLockDelayUnits = 0,
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.wLockDelay = 0,
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};
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static struct usb_descriptor_header *f_audio_desc[] = {
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(struct usb_descriptor_header *)&ac_interface_desc,
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(struct usb_descriptor_header *)&ac_header_desc,
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(struct usb_descriptor_header *)&usb_out_it_desc,
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(struct usb_descriptor_header *)&io_out_ot_desc,
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(struct usb_descriptor_header *)&io_in_it_desc,
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(struct usb_descriptor_header *)&usb_in_ot_desc,
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(struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
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(struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
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(struct usb_descriptor_header *)&as_out_header_desc,
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(struct usb_descriptor_header *)&as_out_type_i_desc,
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(struct usb_descriptor_header *)&as_out_ep_desc,
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(struct usb_descriptor_header *)&as_iso_out_desc,
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(struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
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(struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
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(struct usb_descriptor_header *)&as_in_header_desc,
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(struct usb_descriptor_header *)&as_in_type_i_desc,
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(struct usb_descriptor_header *)&as_in_ep_desc,
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(struct usb_descriptor_header *)&as_iso_in_desc,
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NULL,
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};
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enum {
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STR_AC_IF,
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STR_USB_OUT_IT,
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STR_USB_OUT_IT_CH_NAMES,
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STR_IO_OUT_OT,
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STR_IO_IN_IT,
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STR_IO_IN_IT_CH_NAMES,
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STR_USB_IN_OT,
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STR_AS_OUT_IF_ALT0,
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STR_AS_OUT_IF_ALT1,
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STR_AS_IN_IF_ALT0,
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STR_AS_IN_IF_ALT1,
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};
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static struct usb_string strings_uac1[] = {
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[STR_AC_IF].s = "AC Interface",
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[STR_USB_OUT_IT].s = "Playback Input terminal",
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[STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
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[STR_IO_OUT_OT].s = "Playback Output terminal",
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[STR_IO_IN_IT].s = "Capture Input terminal",
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[STR_IO_IN_IT_CH_NAMES].s = "Capture Channels",
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[STR_USB_IN_OT].s = "Capture Output terminal",
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[STR_AS_OUT_IF_ALT0].s = "Playback Inactive",
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[STR_AS_OUT_IF_ALT1].s = "Playback Active",
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[STR_AS_IN_IF_ALT0].s = "Capture Inactive",
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[STR_AS_IN_IF_ALT1].s = "Capture Active",
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{ },
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};
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static struct usb_gadget_strings str_uac1 = {
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.language = 0x0409, /* en-us */
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.strings = strings_uac1,
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};
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static struct usb_gadget_strings *uac1_strings[] = {
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&str_uac1,
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NULL,
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};
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/*
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* This function is an ALSA sound card following USB Audio Class Spec 1.0.
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*/
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static int audio_set_endpoint_req(struct usb_function *f,
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const struct usb_ctrlrequest *ctrl)
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{
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struct usb_composite_dev *cdev = f->config->cdev;
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int value = -EOPNOTSUPP;
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u16 ep = le16_to_cpu(ctrl->wIndex);
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u16 len = le16_to_cpu(ctrl->wLength);
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u16 w_value = le16_to_cpu(ctrl->wValue);
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DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
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ctrl->bRequest, w_value, len, ep);
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switch (ctrl->bRequest) {
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case UAC_SET_CUR:
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value = len;
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break;
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case UAC_SET_MIN:
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break;
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case UAC_SET_MAX:
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break;
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case UAC_SET_RES:
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break;
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case UAC_SET_MEM:
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break;
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default:
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break;
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}
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return value;
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}
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static int audio_get_endpoint_req(struct usb_function *f,
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const struct usb_ctrlrequest *ctrl)
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{
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struct usb_composite_dev *cdev = f->config->cdev;
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int value = -EOPNOTSUPP;
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u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
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u16 len = le16_to_cpu(ctrl->wLength);
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u16 w_value = le16_to_cpu(ctrl->wValue);
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DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
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ctrl->bRequest, w_value, len, ep);
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switch (ctrl->bRequest) {
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case UAC_GET_CUR:
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case UAC_GET_MIN:
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case UAC_GET_MAX:
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case UAC_GET_RES:
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value = len;
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break;
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case UAC_GET_MEM:
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break;
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default:
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break;
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}
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return value;
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}
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static int
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f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
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{
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struct usb_composite_dev *cdev = f->config->cdev;
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struct usb_request *req = cdev->req;
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int value = -EOPNOTSUPP;
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u16 w_index = le16_to_cpu(ctrl->wIndex);
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u16 w_value = le16_to_cpu(ctrl->wValue);
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u16 w_length = le16_to_cpu(ctrl->wLength);
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/* composite driver infrastructure handles everything; interface
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* activation uses set_alt().
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*/
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switch (ctrl->bRequestType) {
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case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
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value = audio_set_endpoint_req(f, ctrl);
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break;
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case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
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value = audio_get_endpoint_req(f, ctrl);
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break;
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default:
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ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
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ctrl->bRequestType, ctrl->bRequest,
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w_value, w_index, w_length);
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}
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/* respond with data transfer or status phase? */
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if (value >= 0) {
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DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
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ctrl->bRequestType, ctrl->bRequest,
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w_value, w_index, w_length);
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req->zero = 0;
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req->length = value;
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value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
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if (value < 0)
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ERROR(cdev, "audio response on err %d\n", value);
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}
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/* device either stalls (value < 0) or reports success */
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return value;
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}
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static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
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{
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struct usb_composite_dev *cdev = f->config->cdev;
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struct usb_gadget *gadget = cdev->gadget;
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struct device *dev = &gadget->dev;
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struct f_uac1 *uac1 = func_to_uac1(f);
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int ret = 0;
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/* No i/f has more than 2 alt settings */
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if (alt > 1) {
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dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
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return -EINVAL;
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}
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if (intf == uac1->ac_intf) {
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/* Control I/f has only 1 AltSetting - 0 */
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if (alt) {
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dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
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return -EINVAL;
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}
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return 0;
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}
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if (intf == uac1->as_out_intf) {
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uac1->as_out_alt = alt;
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if (alt)
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ret = u_audio_start_capture(&uac1->g_audio);
|
|
else
|
|
u_audio_stop_capture(&uac1->g_audio);
|
|
} else if (intf == uac1->as_in_intf) {
|
|
uac1->as_in_alt = alt;
|
|
|
|
if (alt)
|
|
ret = u_audio_start_playback(&uac1->g_audio);
|
|
else
|
|
u_audio_stop_playback(&uac1->g_audio);
|
|
} else {
|
|
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int f_audio_get_alt(struct usb_function *f, unsigned intf)
|
|
{
|
|
struct usb_composite_dev *cdev = f->config->cdev;
|
|
struct usb_gadget *gadget = cdev->gadget;
|
|
struct device *dev = &gadget->dev;
|
|
struct f_uac1 *uac1 = func_to_uac1(f);
|
|
|
|
if (intf == uac1->ac_intf)
|
|
return uac1->ac_alt;
|
|
else if (intf == uac1->as_out_intf)
|
|
return uac1->as_out_alt;
|
|
else if (intf == uac1->as_in_intf)
|
|
return uac1->as_in_alt;
|
|
else
|
|
dev_err(dev, "%s:%d Invalid Interface %d!\n",
|
|
__func__, __LINE__, intf);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
static void f_audio_disable(struct usb_function *f)
|
|
{
|
|
struct f_uac1 *uac1 = func_to_uac1(f);
|
|
|
|
uac1->as_out_alt = 0;
|
|
uac1->as_in_alt = 0;
|
|
|
|
u_audio_stop_capture(&uac1->g_audio);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* audio function driver setup/binding */
|
|
static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
struct usb_composite_dev *cdev = c->cdev;
|
|
struct usb_gadget *gadget = cdev->gadget;
|
|
struct f_uac1 *uac1 = func_to_uac1(f);
|
|
struct g_audio *audio = func_to_g_audio(f);
|
|
struct f_uac1_opts *audio_opts;
|
|
struct usb_ep *ep = NULL;
|
|
struct usb_string *us;
|
|
u8 *sam_freq;
|
|
int rate;
|
|
int status;
|
|
|
|
audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
|
|
|
|
us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
|
|
if (IS_ERR(us))
|
|
return PTR_ERR(us);
|
|
ac_interface_desc.iInterface = us[STR_AC_IF].id;
|
|
usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
|
|
usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
|
|
io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id;
|
|
as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id;
|
|
as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id;
|
|
io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id;
|
|
io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id;
|
|
usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id;
|
|
as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id;
|
|
as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id;
|
|
|
|
/* Set channel numbers */
|
|
usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask);
|
|
usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask);
|
|
as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask);
|
|
as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize;
|
|
as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8;
|
|
io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask);
|
|
io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask);
|
|
as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask);
|
|
as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize;
|
|
as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8;
|
|
|
|
/* Set sample rates */
|
|
rate = audio_opts->c_srate;
|
|
sam_freq = as_out_type_i_desc.tSamFreq[0];
|
|
memcpy(sam_freq, &rate, 3);
|
|
rate = audio_opts->p_srate;
|
|
sam_freq = as_in_type_i_desc.tSamFreq[0];
|
|
memcpy(sam_freq, &rate, 3);
|
|
|
|
/* allocate instance-specific interface IDs, and patch descriptors */
|
|
status = usb_interface_id(c, f);
|
|
if (status < 0)
|
|
goto fail;
|
|
ac_interface_desc.bInterfaceNumber = status;
|
|
uac1->ac_intf = status;
|
|
uac1->ac_alt = 0;
|
|
|
|
status = usb_interface_id(c, f);
|
|
if (status < 0)
|
|
goto fail;
|
|
as_out_interface_alt_0_desc.bInterfaceNumber = status;
|
|
as_out_interface_alt_1_desc.bInterfaceNumber = status;
|
|
uac1->as_out_intf = status;
|
|
uac1->as_out_alt = 0;
|
|
|
|
status = usb_interface_id(c, f);
|
|
if (status < 0)
|
|
goto fail;
|
|
as_in_interface_alt_0_desc.bInterfaceNumber = status;
|
|
as_in_interface_alt_1_desc.bInterfaceNumber = status;
|
|
uac1->as_in_intf = status;
|
|
uac1->as_in_alt = 0;
|
|
|
|
audio->gadget = gadget;
|
|
|
|
status = -ENODEV;
|
|
|
|
/* allocate instance-specific endpoints */
|
|
ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
|
|
if (!ep)
|
|
goto fail;
|
|
audio->out_ep = ep;
|
|
audio->out_ep->desc = &as_out_ep_desc;
|
|
|
|
ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
|
|
if (!ep)
|
|
goto fail;
|
|
audio->in_ep = ep;
|
|
audio->in_ep->desc = &as_in_ep_desc;
|
|
|
|
/* copy descriptors, and track endpoint copies */
|
|
status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
|
|
NULL);
|
|
if (status)
|
|
goto fail;
|
|
|
|
audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
|
|
audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
|
|
audio->params.c_chmask = audio_opts->c_chmask;
|
|
audio->params.c_srate = audio_opts->c_srate;
|
|
audio->params.c_ssize = audio_opts->c_ssize;
|
|
audio->params.p_chmask = audio_opts->p_chmask;
|
|
audio->params.p_srate = audio_opts->p_srate;
|
|
audio->params.p_ssize = audio_opts->p_ssize;
|
|
audio->params.req_number = audio_opts->req_number;
|
|
|
|
status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
|
|
if (status)
|
|
goto err_card_register;
|
|
|
|
return 0;
|
|
|
|
err_card_register:
|
|
usb_free_all_descriptors(f);
|
|
fail:
|
|
return status;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
|
|
{
|
|
return container_of(to_config_group(item), struct f_uac1_opts,
|
|
func_inst.group);
|
|
}
|
|
|
|
static void f_uac1_attr_release(struct config_item *item)
|
|
{
|
|
struct f_uac1_opts *opts = to_f_uac1_opts(item);
|
|
|
|
usb_put_function_instance(&opts->func_inst);
|
|
}
|
|
|
|
static struct configfs_item_operations f_uac1_item_ops = {
|
|
.release = f_uac1_attr_release,
|
|
};
|
|
|
|
#define UAC1_ATTRIBUTE(name) \
|
|
static ssize_t f_uac1_opts_##name##_show( \
|
|
struct config_item *item, \
|
|
char *page) \
|
|
{ \
|
|
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
|
|
int result; \
|
|
\
|
|
mutex_lock(&opts->lock); \
|
|
result = sprintf(page, "%u\n", opts->name); \
|
|
mutex_unlock(&opts->lock); \
|
|
\
|
|
return result; \
|
|
} \
|
|
\
|
|
static ssize_t f_uac1_opts_##name##_store( \
|
|
struct config_item *item, \
|
|
const char *page, size_t len) \
|
|
{ \
|
|
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
|
|
int ret; \
|
|
u32 num; \
|
|
\
|
|
mutex_lock(&opts->lock); \
|
|
if (opts->refcnt) { \
|
|
ret = -EBUSY; \
|
|
goto end; \
|
|
} \
|
|
\
|
|
ret = kstrtou32(page, 0, &num); \
|
|
if (ret) \
|
|
goto end; \
|
|
\
|
|
opts->name = num; \
|
|
ret = len; \
|
|
\
|
|
end: \
|
|
mutex_unlock(&opts->lock); \
|
|
return ret; \
|
|
} \
|
|
\
|
|
CONFIGFS_ATTR(f_uac1_opts_, name)
|
|
|
|
UAC1_ATTRIBUTE(c_chmask);
|
|
UAC1_ATTRIBUTE(c_srate);
|
|
UAC1_ATTRIBUTE(c_ssize);
|
|
UAC1_ATTRIBUTE(p_chmask);
|
|
UAC1_ATTRIBUTE(p_srate);
|
|
UAC1_ATTRIBUTE(p_ssize);
|
|
UAC1_ATTRIBUTE(req_number);
|
|
|
|
static struct configfs_attribute *f_uac1_attrs[] = {
|
|
&f_uac1_opts_attr_c_chmask,
|
|
&f_uac1_opts_attr_c_srate,
|
|
&f_uac1_opts_attr_c_ssize,
|
|
&f_uac1_opts_attr_p_chmask,
|
|
&f_uac1_opts_attr_p_srate,
|
|
&f_uac1_opts_attr_p_ssize,
|
|
&f_uac1_opts_attr_req_number,
|
|
NULL,
|
|
};
|
|
|
|
static struct config_item_type f_uac1_func_type = {
|
|
.ct_item_ops = &f_uac1_item_ops,
|
|
.ct_attrs = f_uac1_attrs,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
static void f_audio_free_inst(struct usb_function_instance *f)
|
|
{
|
|
struct f_uac1_opts *opts;
|
|
|
|
opts = container_of(f, struct f_uac1_opts, func_inst);
|
|
kfree(opts);
|
|
}
|
|
|
|
static struct usb_function_instance *f_audio_alloc_inst(void)
|
|
{
|
|
struct f_uac1_opts *opts;
|
|
|
|
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
|
|
if (!opts)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mutex_init(&opts->lock);
|
|
opts->func_inst.free_func_inst = f_audio_free_inst;
|
|
|
|
config_group_init_type_name(&opts->func_inst.group, "",
|
|
&f_uac1_func_type);
|
|
|
|
opts->c_chmask = UAC1_DEF_CCHMASK;
|
|
opts->c_srate = UAC1_DEF_CSRATE;
|
|
opts->c_ssize = UAC1_DEF_CSSIZE;
|
|
opts->p_chmask = UAC1_DEF_PCHMASK;
|
|
opts->p_srate = UAC1_DEF_PSRATE;
|
|
opts->p_ssize = UAC1_DEF_PSSIZE;
|
|
opts->req_number = UAC1_DEF_REQ_NUM;
|
|
return &opts->func_inst;
|
|
}
|
|
|
|
static void f_audio_free(struct usb_function *f)
|
|
{
|
|
struct g_audio *audio;
|
|
struct f_uac1_opts *opts;
|
|
|
|
audio = func_to_g_audio(f);
|
|
opts = container_of(f->fi, struct f_uac1_opts, func_inst);
|
|
kfree(audio);
|
|
mutex_lock(&opts->lock);
|
|
--opts->refcnt;
|
|
mutex_unlock(&opts->lock);
|
|
}
|
|
|
|
static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
struct g_audio *audio = func_to_g_audio(f);
|
|
|
|
g_audio_cleanup(audio);
|
|
usb_free_all_descriptors(f);
|
|
|
|
audio->gadget = NULL;
|
|
}
|
|
|
|
static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
|
|
{
|
|
struct f_uac1 *uac1;
|
|
struct f_uac1_opts *opts;
|
|
|
|
/* allocate and initialize one new instance */
|
|
uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
|
|
if (!uac1)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
opts = container_of(fi, struct f_uac1_opts, func_inst);
|
|
mutex_lock(&opts->lock);
|
|
++opts->refcnt;
|
|
mutex_unlock(&opts->lock);
|
|
|
|
uac1->g_audio.func.name = "uac1_func";
|
|
uac1->g_audio.func.bind = f_audio_bind;
|
|
uac1->g_audio.func.unbind = f_audio_unbind;
|
|
uac1->g_audio.func.set_alt = f_audio_set_alt;
|
|
uac1->g_audio.func.get_alt = f_audio_get_alt;
|
|
uac1->g_audio.func.setup = f_audio_setup;
|
|
uac1->g_audio.func.disable = f_audio_disable;
|
|
uac1->g_audio.func.free_func = f_audio_free;
|
|
|
|
return &uac1->g_audio.func;
|
|
}
|
|
|
|
DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Ruslan Bilovol");
|