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1377af2f75
Whether highspeed configuration is valid or not is something that composite decides and not the gadget. That gadget can only provide the required descriptors for it. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
776 lines
20 KiB
C
776 lines
20 KiB
C
/*
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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 <cooloney@kernel.org>
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* Copyright (C) 2008 Analog Devices, Inc
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*
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* Enter bugs at http://blackfin.uclinux.org/
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*
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* Licensed under the GPL-2 or later.
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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/device.h>
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#include <linux/atomic.h>
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#include "u_uac1.h"
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#define OUT_EP_MAX_PACKET_SIZE 200
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static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
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module_param(req_buf_size, int, S_IRUGO);
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MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
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static int req_count = 256;
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module_param(req_count, int, S_IRUGO);
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MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
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static int audio_buf_size = 48000;
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module_param(audio_buf_size, int, S_IRUGO);
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MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
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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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* DESCRIPTORS ... most are static, but strings and full
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* configuration descriptors are built on demand.
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*/
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/*
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* We have 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 2
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/* B.3.1 Standard AC Interface Descriptor */
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static struct usb_interface_descriptor ac_interface_desc __initdata = {
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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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DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
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#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
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/* 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_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 = __constant_cpu_to_le16(0x0100),
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.wTotalLength = __constant_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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[0] = F_AUDIO_AC_INTERFACE,
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[1] = F_AUDIO_AS_INTERFACE,
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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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DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
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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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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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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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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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#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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/* 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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/* 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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DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
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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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/* 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 = __constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
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.bInterval = 4,
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};
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/* Class-specific AS ISO OUT Endpoint Descriptor */
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static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = {
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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 = __constant_cpu_to_le16(1),
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};
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static struct usb_descriptor_header *f_audio_desc[] __initdata = {
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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 *)&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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(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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* 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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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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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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/* endpoints handle full and/or high speeds */
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struct usb_ep *out_ep;
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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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/* 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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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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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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int err;
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if (!copy_buf)
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return -EINVAL;
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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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list_add_tail(©_buf->list, &audio->play_queue);
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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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return 0;
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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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switch (status) {
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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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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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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) {
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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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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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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:
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break;
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case UAC_SET_MAX:
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break;
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case UAC_SET_RES:
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break;
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case UAC_SET_MEM:
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break;
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default:
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break;
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}
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return value;
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}
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static int audio_get_endpoint_req(struct usb_function *f,
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const struct usb_ctrlrequest *ctrl)
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{
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struct usb_composite_dev *cdev = f->config->cdev;
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int value = -EOPNOTSUPP;
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u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
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u16 len = le16_to_cpu(ctrl->wLength);
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u16 w_value = le16_to_cpu(ctrl->wValue);
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DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
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ctrl->bRequest, w_value, len, ep);
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switch (ctrl->bRequest) {
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case UAC_GET_CUR:
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case UAC_GET_MIN:
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case UAC_GET_MAX:
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case UAC_GET_RES:
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value = len;
|
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break;
|
|
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;
|
|
int i = 0, err = 0;
|
|
|
|
DBG(cdev, "intf %d, alt %d\n", intf, alt);
|
|
|
|
if (intf == 1) {
|
|
if (alt == 1) {
|
|
usb_ep_enable(out_ep);
|
|
out_ep->driver_data = audio;
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
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 __init
|
|
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);
|
|
int status;
|
|
struct usb_ep *ep;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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->driver_data = cdev; /* claim */
|
|
|
|
status = -ENOMEM;
|
|
|
|
/* copy descriptors, and track endpoint copies */
|
|
f->descriptors = usb_copy_descriptors(f_audio_desc);
|
|
|
|
/*
|
|
* support all relevant hardware speeds... we expect that when
|
|
* hardware is dual speed, all bulk-capable endpoints work at
|
|
* both speeds
|
|
*/
|
|
if (gadget_is_dualspeed(c->cdev->gadget)) {
|
|
f->hs_descriptors = usb_copy_descriptors(f_audio_desc);
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
|
|
return status;
|
|
}
|
|
|
|
static void
|
|
f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
struct f_audio *audio = func_to_audio(f);
|
|
|
|
usb_free_descriptors(f->descriptors);
|
|
usb_free_descriptors(f->hs_descriptors);
|
|
kfree(audio);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
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 */
|
|
int __init 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;
|
|
}
|
|
|
|
/**
|
|
* audio_bind_config - add USB audio function to a configuration
|
|
* @c: the configuration to supcard the USB audio function
|
|
* Context: single threaded during gadget setup
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*/
|
|
int __init audio_bind_config(struct usb_configuration *c)
|
|
{
|
|
struct f_audio *audio;
|
|
int status;
|
|
|
|
/* allocate and initialize one new instance */
|
|
audio = kzalloc(sizeof *audio, GFP_KERNEL);
|
|
if (!audio)
|
|
return -ENOMEM;
|
|
|
|
audio->card.func.name = "g_audio";
|
|
audio->card.gadget = c->cdev->gadget;
|
|
|
|
INIT_LIST_HEAD(&audio->play_queue);
|
|
spin_lock_init(&audio->lock);
|
|
|
|
/* set up ASLA audio devices */
|
|
status = gaudio_setup(&audio->card);
|
|
if (status < 0)
|
|
goto setup_fail;
|
|
|
|
audio->card.func.strings = audio_strings;
|
|
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.setup = f_audio_setup;
|
|
audio->card.func.disable = f_audio_disable;
|
|
|
|
control_selector_init(audio);
|
|
|
|
INIT_WORK(&audio->playback_work, f_audio_playback_work);
|
|
|
|
status = usb_add_function(c, &audio->card.func);
|
|
if (status)
|
|
goto add_fail;
|
|
|
|
INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n",
|
|
audio_buf_size, req_buf_size, req_count);
|
|
|
|
return status;
|
|
|
|
add_fail:
|
|
gaudio_cleanup();
|
|
setup_fail:
|
|
kfree(audio);
|
|
return status;
|
|
}
|