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844 lines
24 KiB
844 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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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 <[email protected]> |
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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 <[email protected]> |
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* Copyright (C) 2008 Analog Devices, Inc |
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*/ |
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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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|
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#include "u_audio.h" |
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#include "u_uac1.h" |
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|
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/* UAC1 spec: 3.7.2.3 Audio Channel Cluster Format */ |
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#define UAC1_CHANNEL_MASK 0x0FFF |
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|
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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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|
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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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static inline struct f_uac1_opts *g_audio_to_uac1_opts(struct g_audio *audio) |
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{ |
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return container_of(audio->func.fi, struct f_uac1_opts, func_inst); |
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} |
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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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/* |
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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case UAC_SET_MIN: |
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break; |
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|
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case UAC_SET_MAX: |
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break; |
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|
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case UAC_SET_RES: |
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break; |
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|
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case UAC_SET_MEM: |
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break; |
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|
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default: |
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break; |
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} |
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|
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return value; |
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} |
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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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|
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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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|
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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); |
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else |
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u_audio_stop_capture(&uac1->g_audio); |
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} else if (intf == uac1->as_in_intf) { |
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uac1->as_in_alt = alt; |
|
|
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if (alt) |
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ret = u_audio_start_playback(&uac1->g_audio); |
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else |
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u_audio_stop_playback(&uac1->g_audio); |
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} else { |
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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 ret; |
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} |
|
|
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static int f_audio_get_alt(struct usb_function *f, unsigned intf) |
|
{ |
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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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if (intf == uac1->ac_intf) |
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return uac1->ac_alt; |
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else if (intf == uac1->as_out_intf) |
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return uac1->as_out_alt; |
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else if (intf == uac1->as_in_intf) |
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return uac1->as_in_alt; |
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else |
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dev_err(dev, "%s:%d Invalid Interface %d!\n", |
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__func__, __LINE__, intf); |
|
|
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return -EINVAL; |
|
} |
|
|
|
|
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static void f_audio_disable(struct usb_function *f) |
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{ |
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struct f_uac1 *uac1 = func_to_uac1(f); |
|
|
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uac1->as_out_alt = 0; |
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uac1->as_in_alt = 0; |
|
|
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u_audio_stop_playback(&uac1->g_audio); |
|
u_audio_stop_capture(&uac1->g_audio); |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
static int f_audio_validate_opts(struct g_audio *audio, struct device *dev) |
|
{ |
|
struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); |
|
|
|
if (!opts->p_chmask && !opts->c_chmask) { |
|
dev_err(dev, "Error: no playback and capture channels\n"); |
|
return -EINVAL; |
|
} else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) { |
|
dev_err(dev, "Error: unsupported playback channels mask\n"); |
|
return -EINVAL; |
|
} else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) { |
|
dev_err(dev, "Error: unsupported capture channels mask\n"); |
|
return -EINVAL; |
|
} else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) { |
|
dev_err(dev, "Error: incorrect playback sample size\n"); |
|
return -EINVAL; |
|
} else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) { |
|
dev_err(dev, "Error: incorrect capture sample size\n"); |
|
return -EINVAL; |
|
} else if (!opts->p_srate) { |
|
dev_err(dev, "Error: incorrect playback sampling rate\n"); |
|
return -EINVAL; |
|
} else if (!opts->c_srate) { |
|
dev_err(dev, "Error: incorrect capture sampling rate\n"); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* 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 device *dev = &gadget->dev; |
|
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; |
|
|
|
status = f_audio_validate_opts(audio, dev); |
|
if (status) |
|
return 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; |
|
ac_header_desc.baInterfaceNr[0] = 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; |
|
ac_header_desc.baInterfaceNr[1] = 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 const 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");
|
|
|