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1018 lines
26 KiB
1018 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* f_audio.c -- USB Audio class function driver |
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* |
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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/slab.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include <linux/atomic.h> |
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|
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#include "u_uac1_legacy.h" |
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|
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static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value); |
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static int generic_get_cmd(struct usb_audio_control *con, u8 cmd); |
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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 two interfaces- AudioControl and AudioStreaming |
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* TODO: only supcard playback currently |
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*/ |
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#define F_AUDIO_AC_INTERFACE 0 |
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#define F_AUDIO_AS_INTERFACE 1 |
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#define F_AUDIO_NUM_INTERFACES 1 |
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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(1); |
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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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/* 1 input terminal, 1 output terminal and 1 feature unit */ |
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#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \ |
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+ UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0)) |
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/* B.3.2 Class-Specific AC Interface Descriptor */ |
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static struct uac1_ac_header_descriptor_1 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 first AudioStream interface */ |
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[0] = 1, |
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} |
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}; |
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|
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#define INPUT_TERMINAL_ID 1 |
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static struct uac_input_terminal_descriptor input_terminal_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 = INPUT_TERMINAL_ID, |
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.wTerminalType = UAC_TERMINAL_STREAMING, |
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.bAssocTerminal = 0, |
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.wChannelConfig = 0x3, |
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}; |
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|
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DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0); |
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|
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#define FEATURE_UNIT_ID 2 |
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static struct uac_feature_unit_descriptor_0 feature_unit_desc = { |
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.bLength = UAC_DT_FEATURE_UNIT_SIZE(0), |
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.bDescriptorType = USB_DT_CS_INTERFACE, |
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.bDescriptorSubtype = UAC_FEATURE_UNIT, |
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.bUnitID = FEATURE_UNIT_ID, |
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.bSourceID = INPUT_TERMINAL_ID, |
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.bControlSize = 2, |
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.bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME), |
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}; |
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|
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static struct usb_audio_control mute_control = { |
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.list = LIST_HEAD_INIT(mute_control.list), |
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.name = "Mute Control", |
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.type = UAC_FU_MUTE, |
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/* Todo: add real Mute control code */ |
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.set = generic_set_cmd, |
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.get = generic_get_cmd, |
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}; |
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|
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static struct usb_audio_control volume_control = { |
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.list = LIST_HEAD_INIT(volume_control.list), |
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.name = "Volume Control", |
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.type = UAC_FU_VOLUME, |
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/* Todo: add real Volume control code */ |
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.set = generic_set_cmd, |
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.get = generic_get_cmd, |
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}; |
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|
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static struct usb_audio_control_selector feature_unit = { |
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.list = LIST_HEAD_INIT(feature_unit.list), |
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.id = FEATURE_UNIT_ID, |
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.name = "Mute & Volume Control", |
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.type = UAC_FEATURE_UNIT, |
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.desc = (struct usb_descriptor_header *)&feature_unit_desc, |
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}; |
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|
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#define OUTPUT_TERMINAL_ID 3 |
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static struct uac1_output_terminal_descriptor output_terminal_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 = OUTPUT_TERMINAL_ID, |
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.wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER, |
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.bAssocTerminal = FEATURE_UNIT_ID, |
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.bSourceID = FEATURE_UNIT_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_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_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_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 = INPUT_TERMINAL_ID, |
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.bDelay = 1, |
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.wFormatTag = UAC_FORMAT_TYPE_I_PCM, |
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}; |
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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_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 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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|
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(struct usb_descriptor_header *)&input_terminal_desc, |
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(struct usb_descriptor_header *)&output_terminal_desc, |
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(struct usb_descriptor_header *)&feature_unit_desc, |
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(struct usb_descriptor_header *)&as_interface_alt_0_desc, |
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(struct usb_descriptor_header *)&as_interface_alt_1_desc, |
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(struct usb_descriptor_header *)&as_header_desc, |
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(struct usb_descriptor_header *)&as_type_i_desc, |
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|
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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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NULL, |
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}; |
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|
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enum { |
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STR_AC_IF, |
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STR_INPUT_TERMINAL, |
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STR_INPUT_TERMINAL_CH_NAMES, |
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STR_FEAT_DESC_0, |
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STR_OUTPUT_TERMINAL, |
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STR_AS_IF_ALT0, |
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STR_AS_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_INPUT_TERMINAL].s = "Input terminal", |
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[STR_INPUT_TERMINAL_CH_NAMES].s = "Channels", |
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[STR_FEAT_DESC_0].s = "Volume control & mute", |
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[STR_OUTPUT_TERMINAL].s = "Output terminal", |
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[STR_AS_IF_ALT0].s = "AS Interface", |
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[STR_AS_IF_ALT1].s = "AS Interface", |
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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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/*-------------------------------------------------------------------------*/ |
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struct f_audio_buf { |
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u8 *buf; |
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int actual; |
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struct list_head list; |
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}; |
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static struct f_audio_buf *f_audio_buffer_alloc(int buf_size) |
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{ |
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struct f_audio_buf *copy_buf; |
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copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC); |
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if (!copy_buf) |
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return ERR_PTR(-ENOMEM); |
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|
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copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC); |
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if (!copy_buf->buf) { |
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kfree(copy_buf); |
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return ERR_PTR(-ENOMEM); |
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} |
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return copy_buf; |
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} |
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static void f_audio_buffer_free(struct f_audio_buf *audio_buf) |
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{ |
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kfree(audio_buf->buf); |
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kfree(audio_buf); |
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} |
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/*-------------------------------------------------------------------------*/ |
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struct f_audio { |
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struct gaudio card; |
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|
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u8 ac_intf, ac_alt; |
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u8 as_intf, as_alt; |
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|
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/* endpoints handle full and/or high speeds */ |
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struct usb_ep *out_ep; |
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|
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spinlock_t lock; |
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struct f_audio_buf *copy_buf; |
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struct work_struct playback_work; |
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struct list_head play_queue; |
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|
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/* Control Set command */ |
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struct list_head cs; |
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u8 set_cmd; |
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struct usb_audio_control *set_con; |
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}; |
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static inline struct f_audio *func_to_audio(struct usb_function *f) |
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{ |
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return container_of(f, struct f_audio, card.func); |
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} |
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|
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/*-------------------------------------------------------------------------*/ |
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static void f_audio_playback_work(struct work_struct *data) |
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{ |
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struct f_audio *audio = container_of(data, struct f_audio, |
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playback_work); |
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struct f_audio_buf *play_buf; |
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spin_lock_irq(&audio->lock); |
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if (list_empty(&audio->play_queue)) { |
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spin_unlock_irq(&audio->lock); |
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return; |
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} |
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play_buf = list_first_entry(&audio->play_queue, |
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struct f_audio_buf, list); |
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list_del(&play_buf->list); |
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spin_unlock_irq(&audio->lock); |
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|
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u_audio_playback(&audio->card, play_buf->buf, play_buf->actual); |
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f_audio_buffer_free(play_buf); |
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} |
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static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req) |
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{ |
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struct f_audio *audio = req->context; |
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struct usb_composite_dev *cdev = audio->card.func.config->cdev; |
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struct f_audio_buf *copy_buf = audio->copy_buf; |
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struct f_uac1_legacy_opts *opts; |
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int audio_buf_size; |
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int err; |
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opts = container_of(audio->card.func.fi, struct f_uac1_legacy_opts, |
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func_inst); |
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audio_buf_size = opts->audio_buf_size; |
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|
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if (!copy_buf) |
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return -EINVAL; |
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|
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/* Copy buffer is full, add it to the play_queue */ |
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if (audio_buf_size - copy_buf->actual < req->actual) { |
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spin_lock_irq(&audio->lock); |
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list_add_tail(©_buf->list, &audio->play_queue); |
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spin_unlock_irq(&audio->lock); |
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schedule_work(&audio->playback_work); |
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copy_buf = f_audio_buffer_alloc(audio_buf_size); |
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if (IS_ERR(copy_buf)) |
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return -ENOMEM; |
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} |
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memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual); |
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copy_buf->actual += req->actual; |
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audio->copy_buf = copy_buf; |
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err = usb_ep_queue(ep, req, GFP_ATOMIC); |
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if (err) |
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ERROR(cdev, "%s queue req: %d\n", ep->name, err); |
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|
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return 0; |
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|
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} |
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static void f_audio_complete(struct usb_ep *ep, struct usb_request *req) |
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{ |
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struct f_audio *audio = req->context; |
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int status = req->status; |
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u32 data = 0; |
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struct usb_ep *out_ep = audio->out_ep; |
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|
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switch (status) { |
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|
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case 0: /* normal completion? */ |
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if (ep == out_ep) |
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f_audio_out_ep_complete(ep, req); |
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else if (audio->set_con) { |
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memcpy(&data, req->buf, req->length); |
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audio->set_con->set(audio->set_con, audio->set_cmd, |
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le16_to_cpu(data)); |
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audio->set_con = NULL; |
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} |
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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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|
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static int audio_set_intf_req(struct usb_function *f, |
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const struct usb_ctrlrequest *ctrl) |
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{ |
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struct f_audio *audio = func_to_audio(f); |
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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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u8 id = ((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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u8 con_sel = (w_value >> 8) & 0xFF; |
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u8 cmd = (ctrl->bRequest & 0x0F); |
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struct usb_audio_control_selector *cs; |
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struct usb_audio_control *con; |
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|
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DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", |
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ctrl->bRequest, w_value, len, id); |
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|
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list_for_each_entry(cs, &audio->cs, list) { |
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if (cs->id == id) { |
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list_for_each_entry(con, &cs->control, list) { |
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if (con->type == con_sel) { |
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audio->set_con = con; |
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break; |
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} |
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} |
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break; |
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} |
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} |
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|
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audio->set_cmd = cmd; |
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req->context = audio; |
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req->complete = f_audio_complete; |
|
|
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return len; |
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} |
|
|
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static int audio_get_intf_req(struct usb_function *f, |
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const struct usb_ctrlrequest *ctrl) |
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{ |
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struct f_audio *audio = func_to_audio(f); |
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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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u8 id = ((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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u8 con_sel = (w_value >> 8) & 0xFF; |
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u8 cmd = (ctrl->bRequest & 0x0F); |
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struct usb_audio_control_selector *cs; |
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struct usb_audio_control *con; |
|
|
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DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", |
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ctrl->bRequest, w_value, len, id); |
|
|
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list_for_each_entry(cs, &audio->cs, list) { |
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if (cs->id == id) { |
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list_for_each_entry(con, &cs->control, list) { |
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if (con->type == con_sel && con->get) { |
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value = con->get(con, cmd); |
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break; |
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} |
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} |
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break; |
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} |
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} |
|
|
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req->context = audio; |
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req->complete = f_audio_complete; |
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len = min_t(size_t, sizeof(value), len); |
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memcpy(req->buf, &value, len); |
|
|
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return len; |
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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: |
|
break; |
|
|
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case UAC_SET_MAX: |
|
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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static int audio_get_endpoint_req(struct usb_function *f, |
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const struct usb_ctrlrequest *ctrl) |
|
{ |
|
struct usb_composite_dev *cdev = f->config->cdev; |
|
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); |
|
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; |
|
break; |
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case UAC_GET_MEM: |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
return value; |
|
} |
|
|
|
static int |
|
f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) |
|
{ |
|
struct usb_composite_dev *cdev = f->config->cdev; |
|
struct usb_request *req = cdev->req; |
|
int value = -EOPNOTSUPP; |
|
u16 w_index = le16_to_cpu(ctrl->wIndex); |
|
u16 w_value = le16_to_cpu(ctrl->wValue); |
|
u16 w_length = le16_to_cpu(ctrl->wLength); |
|
|
|
/* composite driver infrastructure handles everything; interface |
|
* activation uses set_alt(). |
|
*/ |
|
switch (ctrl->bRequestType) { |
|
case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE: |
|
value = audio_set_intf_req(f, ctrl); |
|
break; |
|
|
|
case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE: |
|
value = audio_get_intf_req(f, ctrl); |
|
break; |
|
|
|
case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: |
|
value = audio_set_endpoint_req(f, ctrl); |
|
break; |
|
|
|
case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: |
|
value = audio_get_endpoint_req(f, ctrl); |
|
break; |
|
|
|
default: |
|
ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", |
|
ctrl->bRequestType, ctrl->bRequest, |
|
w_value, w_index, w_length); |
|
} |
|
|
|
/* respond with data transfer or status phase? */ |
|
if (value >= 0) { |
|
DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n", |
|
ctrl->bRequestType, ctrl->bRequest, |
|
w_value, w_index, w_length); |
|
req->zero = 0; |
|
req->length = value; |
|
value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); |
|
if (value < 0) |
|
ERROR(cdev, "audio response on err %d\n", value); |
|
} |
|
|
|
/* device either stalls (value < 0) or reports success */ |
|
return value; |
|
} |
|
|
|
static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
|
{ |
|
struct f_audio *audio = func_to_audio(f); |
|
struct usb_composite_dev *cdev = f->config->cdev; |
|
struct usb_ep *out_ep = audio->out_ep; |
|
struct usb_request *req; |
|
struct f_uac1_legacy_opts *opts; |
|
int req_buf_size, req_count, audio_buf_size; |
|
int i = 0, err = 0; |
|
|
|
DBG(cdev, "intf %d, alt %d\n", intf, alt); |
|
|
|
opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); |
|
req_buf_size = opts->req_buf_size; |
|
req_count = opts->req_count; |
|
audio_buf_size = opts->audio_buf_size; |
|
|
|
/* No i/f has more than 2 alt settings */ |
|
if (alt > 1) { |
|
ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__); |
|
return -EINVAL; |
|
} |
|
|
|
if (intf == audio->ac_intf) { |
|
/* Control I/f has only 1 AltSetting - 0 */ |
|
if (alt) { |
|
ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__); |
|
return -EINVAL; |
|
} |
|
return 0; |
|
} else if (intf == audio->as_intf) { |
|
if (alt == 1) { |
|
err = config_ep_by_speed(cdev->gadget, f, out_ep); |
|
if (err) |
|
return err; |
|
|
|
usb_ep_enable(out_ep); |
|
audio->copy_buf = f_audio_buffer_alloc(audio_buf_size); |
|
if (IS_ERR(audio->copy_buf)) |
|
return -ENOMEM; |
|
|
|
/* |
|
* allocate a bunch of read buffers |
|
* and queue them all at once. |
|
*/ |
|
for (i = 0; i < req_count && err == 0; i++) { |
|
req = usb_ep_alloc_request(out_ep, GFP_ATOMIC); |
|
if (req) { |
|
req->buf = kzalloc(req_buf_size, |
|
GFP_ATOMIC); |
|
if (req->buf) { |
|
req->length = req_buf_size; |
|
req->context = audio; |
|
req->complete = |
|
f_audio_complete; |
|
err = usb_ep_queue(out_ep, |
|
req, GFP_ATOMIC); |
|
if (err) |
|
ERROR(cdev, |
|
"%s queue req: %d\n", |
|
out_ep->name, err); |
|
} else |
|
err = -ENOMEM; |
|
} else |
|
err = -ENOMEM; |
|
} |
|
|
|
} else { |
|
struct f_audio_buf *copy_buf = audio->copy_buf; |
|
if (copy_buf) { |
|
list_add_tail(©_buf->list, |
|
&audio->play_queue); |
|
schedule_work(&audio->playback_work); |
|
} |
|
} |
|
audio->as_alt = alt; |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static int f_audio_get_alt(struct usb_function *f, unsigned intf) |
|
{ |
|
struct f_audio *audio = func_to_audio(f); |
|
struct usb_composite_dev *cdev = f->config->cdev; |
|
|
|
if (intf == audio->ac_intf) |
|
return audio->ac_alt; |
|
else if (intf == audio->as_intf) |
|
return audio->as_alt; |
|
else |
|
ERROR(cdev, "%s:%d Invalid Interface %d!\n", |
|
__func__, __LINE__, intf); |
|
|
|
return -EINVAL; |
|
} |
|
|
|
static void f_audio_disable(struct usb_function *f) |
|
{ |
|
return; |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
static void f_audio_build_desc(struct f_audio *audio) |
|
{ |
|
struct gaudio *card = &audio->card; |
|
u8 *sam_freq; |
|
int rate; |
|
|
|
/* Set channel numbers */ |
|
input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card); |
|
as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card); |
|
|
|
/* Set sample rates */ |
|
rate = u_audio_get_playback_rate(card); |
|
sam_freq = as_type_i_desc.tSamFreq[0]; |
|
memcpy(sam_freq, &rate, 3); |
|
|
|
/* Todo: Set Sample bits and other parameters */ |
|
|
|
return; |
|
} |
|
|
|
/* 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 f_audio *audio = func_to_audio(f); |
|
struct usb_string *us; |
|
int status; |
|
struct usb_ep *ep = NULL; |
|
struct f_uac1_legacy_opts *audio_opts; |
|
|
|
audio_opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); |
|
audio->card.gadget = c->cdev->gadget; |
|
/* set up ASLA audio devices */ |
|
if (!audio_opts->bound) { |
|
status = gaudio_setup(&audio->card); |
|
if (status < 0) |
|
return status; |
|
audio_opts->bound = true; |
|
} |
|
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; |
|
input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id; |
|
input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id; |
|
feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id; |
|
output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id; |
|
as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id; |
|
as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id; |
|
|
|
|
|
f_audio_build_desc(audio); |
|
|
|
/* allocate instance-specific interface IDs, and patch descriptors */ |
|
status = usb_interface_id(c, f); |
|
if (status < 0) |
|
goto fail; |
|
ac_interface_desc.bInterfaceNumber = status; |
|
audio->ac_intf = status; |
|
audio->ac_alt = 0; |
|
|
|
status = usb_interface_id(c, f); |
|
if (status < 0) |
|
goto fail; |
|
as_interface_alt_0_desc.bInterfaceNumber = status; |
|
as_interface_alt_1_desc.bInterfaceNumber = status; |
|
audio->as_intf = status; |
|
audio->as_alt = 0; |
|
|
|
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; |
|
|
|
/* copy descriptors, and track endpoint copies */ |
|
status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL, |
|
NULL); |
|
if (status) |
|
goto fail; |
|
return 0; |
|
|
|
fail: |
|
gaudio_cleanup(&audio->card); |
|
return status; |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) |
|
{ |
|
con->data[cmd] = value; |
|
|
|
return 0; |
|
} |
|
|
|
static int generic_get_cmd(struct usb_audio_control *con, u8 cmd) |
|
{ |
|
return con->data[cmd]; |
|
} |
|
|
|
/* Todo: add more control selecotor dynamically */ |
|
static int control_selector_init(struct f_audio *audio) |
|
{ |
|
INIT_LIST_HEAD(&audio->cs); |
|
list_add(&feature_unit.list, &audio->cs); |
|
|
|
INIT_LIST_HEAD(&feature_unit.control); |
|
list_add(&mute_control.list, &feature_unit.control); |
|
list_add(&volume_control.list, &feature_unit.control); |
|
|
|
volume_control.data[UAC__CUR] = 0xffc0; |
|
volume_control.data[UAC__MIN] = 0xe3a0; |
|
volume_control.data[UAC__MAX] = 0xfff0; |
|
volume_control.data[UAC__RES] = 0x0030; |
|
|
|
return 0; |
|
} |
|
|
|
static inline |
|
struct f_uac1_legacy_opts *to_f_uac1_opts(struct config_item *item) |
|
{ |
|
return container_of(to_config_group(item), struct f_uac1_legacy_opts, |
|
func_inst.group); |
|
} |
|
|
|
static void f_uac1_attr_release(struct config_item *item) |
|
{ |
|
struct f_uac1_legacy_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_INT_ATTRIBUTE(name) \ |
|
static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ |
|
char *page) \ |
|
{ \ |
|
struct f_uac1_legacy_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_legacy_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_INT_ATTRIBUTE(req_buf_size); |
|
UAC1_INT_ATTRIBUTE(req_count); |
|
UAC1_INT_ATTRIBUTE(audio_buf_size); |
|
|
|
#define UAC1_STR_ATTRIBUTE(name) \ |
|
static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ |
|
char *page) \ |
|
{ \ |
|
struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ |
|
int result; \ |
|
\ |
|
mutex_lock(&opts->lock); \ |
|
result = sprintf(page, "%s\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_legacy_opts *opts = to_f_uac1_opts(item); \ |
|
int ret = -EBUSY; \ |
|
char *tmp; \ |
|
\ |
|
mutex_lock(&opts->lock); \ |
|
if (opts->refcnt) \ |
|
goto end; \ |
|
\ |
|
tmp = kstrndup(page, len, GFP_KERNEL); \ |
|
if (tmp) { \ |
|
ret = -ENOMEM; \ |
|
goto end; \ |
|
} \ |
|
if (opts->name##_alloc) \ |
|
kfree(opts->name); \ |
|
opts->name##_alloc = true; \ |
|
opts->name = tmp; \ |
|
ret = len; \ |
|
\ |
|
end: \ |
|
mutex_unlock(&opts->lock); \ |
|
return ret; \ |
|
} \ |
|
\ |
|
CONFIGFS_ATTR(f_uac1_opts_, name) |
|
|
|
UAC1_STR_ATTRIBUTE(fn_play); |
|
UAC1_STR_ATTRIBUTE(fn_cap); |
|
UAC1_STR_ATTRIBUTE(fn_cntl); |
|
|
|
static struct configfs_attribute *f_uac1_attrs[] = { |
|
&f_uac1_opts_attr_req_buf_size, |
|
&f_uac1_opts_attr_req_count, |
|
&f_uac1_opts_attr_audio_buf_size, |
|
&f_uac1_opts_attr_fn_play, |
|
&f_uac1_opts_attr_fn_cap, |
|
&f_uac1_opts_attr_fn_cntl, |
|
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_legacy_opts *opts; |
|
|
|
opts = container_of(f, struct f_uac1_legacy_opts, func_inst); |
|
if (opts->fn_play_alloc) |
|
kfree(opts->fn_play); |
|
if (opts->fn_cap_alloc) |
|
kfree(opts->fn_cap); |
|
if (opts->fn_cntl_alloc) |
|
kfree(opts->fn_cntl); |
|
kfree(opts); |
|
} |
|
|
|
static struct usb_function_instance *f_audio_alloc_inst(void) |
|
{ |
|
struct f_uac1_legacy_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->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE; |
|
opts->req_count = UAC1_REQ_COUNT; |
|
opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE; |
|
opts->fn_play = FILE_PCM_PLAYBACK; |
|
opts->fn_cap = FILE_PCM_CAPTURE; |
|
opts->fn_cntl = FILE_CONTROL; |
|
return &opts->func_inst; |
|
} |
|
|
|
static void f_audio_free(struct usb_function *f) |
|
{ |
|
struct f_audio *audio = func_to_audio(f); |
|
struct f_uac1_legacy_opts *opts; |
|
|
|
gaudio_cleanup(&audio->card); |
|
opts = container_of(f->fi, struct f_uac1_legacy_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) |
|
{ |
|
usb_free_all_descriptors(f); |
|
} |
|
|
|
static struct usb_function *f_audio_alloc(struct usb_function_instance *fi) |
|
{ |
|
struct f_audio *audio; |
|
struct f_uac1_legacy_opts *opts; |
|
|
|
/* allocate and initialize one new instance */ |
|
audio = kzalloc(sizeof(*audio), GFP_KERNEL); |
|
if (!audio) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
audio->card.func.name = "g_audio"; |
|
|
|
opts = container_of(fi, struct f_uac1_legacy_opts, func_inst); |
|
mutex_lock(&opts->lock); |
|
++opts->refcnt; |
|
mutex_unlock(&opts->lock); |
|
INIT_LIST_HEAD(&audio->play_queue); |
|
spin_lock_init(&audio->lock); |
|
|
|
audio->card.func.bind = f_audio_bind; |
|
audio->card.func.unbind = f_audio_unbind; |
|
audio->card.func.set_alt = f_audio_set_alt; |
|
audio->card.func.get_alt = f_audio_get_alt; |
|
audio->card.func.setup = f_audio_setup; |
|
audio->card.func.disable = f_audio_disable; |
|
audio->card.func.free_func = f_audio_free; |
|
|
|
control_selector_init(audio); |
|
|
|
INIT_WORK(&audio->playback_work, f_audio_playback_work); |
|
|
|
return &audio->card.func; |
|
} |
|
|
|
DECLARE_USB_FUNCTION_INIT(uac1_legacy, f_audio_alloc_inst, f_audio_alloc); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Bryan Wu");
|
|
|