801 строка
22 KiB
C
801 строка
22 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API)
|
|
*
|
|
* Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
|
|
*
|
|
* This driver doesn't expect any real Audio codec to be present
|
|
* on the device - the audio streams are simply sinked to and
|
|
* sourced from a virtual ALSA sound card created.
|
|
*
|
|
* This file is based on f_uac1.c which is
|
|
* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
|
|
* Copyright (C) 2008 Analog Devices, Inc
|
|
*/
|
|
|
|
#include <linux/usb/audio.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "u_audio.h"
|
|
#include "u_uac1.h"
|
|
|
|
struct f_uac1 {
|
|
struct g_audio g_audio;
|
|
u8 ac_intf, as_in_intf, as_out_intf;
|
|
u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
|
|
};
|
|
|
|
static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
|
|
{
|
|
return container_of(f, struct f_uac1, g_audio.func);
|
|
}
|
|
|
|
/*
|
|
* DESCRIPTORS ... most are static, but strings and full
|
|
* configuration descriptors are built on demand.
|
|
*/
|
|
|
|
/*
|
|
* We have three interfaces - one AudioControl and two AudioStreaming
|
|
*
|
|
* The driver implements a simple UAC_1 topology.
|
|
* USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture
|
|
* ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
|
|
*/
|
|
#define F_AUDIO_AC_INTERFACE 0
|
|
#define F_AUDIO_AS_OUT_INTERFACE 1
|
|
#define F_AUDIO_AS_IN_INTERFACE 2
|
|
/* Number of streaming interfaces */
|
|
#define F_AUDIO_NUM_INTERFACES 2
|
|
|
|
/* B.3.1 Standard AC Interface Descriptor */
|
|
static struct usb_interface_descriptor ac_interface_desc = {
|
|
.bLength = USB_DT_INTERFACE_SIZE,
|
|
.bDescriptorType = USB_DT_INTERFACE,
|
|
.bNumEndpoints = 0,
|
|
.bInterfaceClass = USB_CLASS_AUDIO,
|
|
.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
|
|
};
|
|
|
|
/*
|
|
* The number of AudioStreaming and MIDIStreaming interfaces
|
|
* in the Audio Interface Collection
|
|
*/
|
|
DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
|
|
|
|
#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
|
|
/* 2 input terminals and 2 output terminals */
|
|
#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \
|
|
+ 2*UAC_DT_INPUT_TERMINAL_SIZE + 2*UAC_DT_OUTPUT_TERMINAL_SIZE)
|
|
/* B.3.2 Class-Specific AC Interface Descriptor */
|
|
static struct uac1_ac_header_descriptor_2 ac_header_desc = {
|
|
.bLength = UAC_DT_AC_HEADER_LENGTH,
|
|
.bDescriptorType = USB_DT_CS_INTERFACE,
|
|
.bDescriptorSubtype = UAC_HEADER,
|
|
.bcdADC = cpu_to_le16(0x0100),
|
|
.wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH),
|
|
.bInCollection = F_AUDIO_NUM_INTERFACES,
|
|
.baInterfaceNr = {
|
|
/* Interface number of the AudioStream interfaces */
|
|
[0] = 1,
|
|
[1] = 2,
|
|
}
|
|
};
|
|
|
|
#define USB_OUT_IT_ID 1
|
|
static struct uac_input_terminal_descriptor usb_out_it_desc = {
|
|
.bLength = UAC_DT_INPUT_TERMINAL_SIZE,
|
|
.bDescriptorType = USB_DT_CS_INTERFACE,
|
|
.bDescriptorSubtype = UAC_INPUT_TERMINAL,
|
|
.bTerminalID = USB_OUT_IT_ID,
|
|
.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
|
|
.bAssocTerminal = 0,
|
|
.wChannelConfig = cpu_to_le16(0x3),
|
|
};
|
|
|
|
#define IO_OUT_OT_ID 2
|
|
static struct uac1_output_terminal_descriptor io_out_ot_desc = {
|
|
.bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
|
|
.bDescriptorType = USB_DT_CS_INTERFACE,
|
|
.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
|
|
.bTerminalID = IO_OUT_OT_ID,
|
|
.wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
|
|
.bAssocTerminal = 0,
|
|
.bSourceID = USB_OUT_IT_ID,
|
|
};
|
|
|
|
#define IO_IN_IT_ID 3
|
|
static struct uac_input_terminal_descriptor io_in_it_desc = {
|
|
.bLength = UAC_DT_INPUT_TERMINAL_SIZE,
|
|
.bDescriptorType = USB_DT_CS_INTERFACE,
|
|
.bDescriptorSubtype = UAC_INPUT_TERMINAL,
|
|
.bTerminalID = IO_IN_IT_ID,
|
|
.wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
|
|
.bAssocTerminal = 0,
|
|
.wChannelConfig = cpu_to_le16(0x3),
|
|
};
|
|
|
|
#define USB_IN_OT_ID 4
|
|
static struct uac1_output_terminal_descriptor usb_in_ot_desc = {
|
|
.bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
|
|
.bDescriptorType = USB_DT_CS_INTERFACE,
|
|
.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
|
|
.bTerminalID = USB_IN_OT_ID,
|
|
.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
|
|
.bAssocTerminal = 0,
|
|
.bSourceID = IO_IN_IT_ID,
|
|
};
|
|
|
|
/* B.4.1 Standard AS Interface Descriptor */
|
|
static struct usb_interface_descriptor as_out_interface_alt_0_desc = {
|
|
.bLength = USB_DT_INTERFACE_SIZE,
|
|
.bDescriptorType = USB_DT_INTERFACE,
|
|
.bAlternateSetting = 0,
|
|
.bNumEndpoints = 0,
|
|
.bInterfaceClass = USB_CLASS_AUDIO,
|
|
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
|
|
};
|
|
|
|
static struct usb_interface_descriptor as_out_interface_alt_1_desc = {
|
|
.bLength = USB_DT_INTERFACE_SIZE,
|
|
.bDescriptorType = USB_DT_INTERFACE,
|
|
.bAlternateSetting = 1,
|
|
.bNumEndpoints = 1,
|
|
.bInterfaceClass = USB_CLASS_AUDIO,
|
|
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
|
|
};
|
|
|
|
static struct usb_interface_descriptor as_in_interface_alt_0_desc = {
|
|
.bLength = USB_DT_INTERFACE_SIZE,
|
|
.bDescriptorType = USB_DT_INTERFACE,
|
|
.bAlternateSetting = 0,
|
|
.bNumEndpoints = 0,
|
|
.bInterfaceClass = USB_CLASS_AUDIO,
|
|
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
|
|
};
|
|
|
|
static struct usb_interface_descriptor as_in_interface_alt_1_desc = {
|
|
.bLength = USB_DT_INTERFACE_SIZE,
|
|
.bDescriptorType = USB_DT_INTERFACE,
|
|
.bAlternateSetting = 1,
|
|
.bNumEndpoints = 1,
|
|
.bInterfaceClass = USB_CLASS_AUDIO,
|
|
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
|
|
};
|
|
|
|
/* B.4.2 Class-Specific AS Interface Descriptor */
|
|
static struct uac1_as_header_descriptor as_out_header_desc = {
|
|
.bLength = UAC_DT_AS_HEADER_SIZE,
|
|
.bDescriptorType = USB_DT_CS_INTERFACE,
|
|
.bDescriptorSubtype = UAC_AS_GENERAL,
|
|
.bTerminalLink = USB_OUT_IT_ID,
|
|
.bDelay = 1,
|
|
.wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
|
|
};
|
|
|
|
static struct uac1_as_header_descriptor as_in_header_desc = {
|
|
.bLength = UAC_DT_AS_HEADER_SIZE,
|
|
.bDescriptorType = USB_DT_CS_INTERFACE,
|
|
.bDescriptorSubtype = UAC_AS_GENERAL,
|
|
.bTerminalLink = USB_IN_OT_ID,
|
|
.bDelay = 1,
|
|
.wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
|
|
};
|
|
|
|
DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
|
|
|
|
static struct uac_format_type_i_discrete_descriptor_1 as_out_type_i_desc = {
|
|
.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
|
|
.bDescriptorType = USB_DT_CS_INTERFACE,
|
|
.bDescriptorSubtype = UAC_FORMAT_TYPE,
|
|
.bFormatType = UAC_FORMAT_TYPE_I,
|
|
.bSubframeSize = 2,
|
|
.bBitResolution = 16,
|
|
.bSamFreqType = 1,
|
|
};
|
|
|
|
/* Standard ISO OUT Endpoint Descriptor */
|
|
static struct usb_endpoint_descriptor as_out_ep_desc = {
|
|
.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
|
.bEndpointAddress = USB_DIR_OUT,
|
|
.bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
|
|
| USB_ENDPOINT_XFER_ISOC,
|
|
.wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
|
|
.bInterval = 4,
|
|
};
|
|
|
|
/* Class-specific AS ISO OUT Endpoint Descriptor */
|
|
static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
|
|
.bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
|
|
.bDescriptorType = USB_DT_CS_ENDPOINT,
|
|
.bDescriptorSubtype = UAC_EP_GENERAL,
|
|
.bmAttributes = 1,
|
|
.bLockDelayUnits = 1,
|
|
.wLockDelay = cpu_to_le16(1),
|
|
};
|
|
|
|
static struct uac_format_type_i_discrete_descriptor_1 as_in_type_i_desc = {
|
|
.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
|
|
.bDescriptorType = USB_DT_CS_INTERFACE,
|
|
.bDescriptorSubtype = UAC_FORMAT_TYPE,
|
|
.bFormatType = UAC_FORMAT_TYPE_I,
|
|
.bSubframeSize = 2,
|
|
.bBitResolution = 16,
|
|
.bSamFreqType = 1,
|
|
};
|
|
|
|
/* Standard ISO OUT Endpoint Descriptor */
|
|
static struct usb_endpoint_descriptor as_in_ep_desc = {
|
|
.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
|
.bEndpointAddress = USB_DIR_IN,
|
|
.bmAttributes = USB_ENDPOINT_SYNC_ASYNC
|
|
| USB_ENDPOINT_XFER_ISOC,
|
|
.wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
|
|
.bInterval = 4,
|
|
};
|
|
|
|
/* Class-specific AS ISO OUT Endpoint Descriptor */
|
|
static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
|
|
.bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
|
|
.bDescriptorType = USB_DT_CS_ENDPOINT,
|
|
.bDescriptorSubtype = UAC_EP_GENERAL,
|
|
.bmAttributes = 1,
|
|
.bLockDelayUnits = 0,
|
|
.wLockDelay = 0,
|
|
};
|
|
|
|
static struct usb_descriptor_header *f_audio_desc[] = {
|
|
(struct usb_descriptor_header *)&ac_interface_desc,
|
|
(struct usb_descriptor_header *)&ac_header_desc,
|
|
|
|
(struct usb_descriptor_header *)&usb_out_it_desc,
|
|
(struct usb_descriptor_header *)&io_out_ot_desc,
|
|
(struct usb_descriptor_header *)&io_in_it_desc,
|
|
(struct usb_descriptor_header *)&usb_in_ot_desc,
|
|
|
|
(struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
|
|
(struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
|
|
(struct usb_descriptor_header *)&as_out_header_desc,
|
|
|
|
(struct usb_descriptor_header *)&as_out_type_i_desc,
|
|
|
|
(struct usb_descriptor_header *)&as_out_ep_desc,
|
|
(struct usb_descriptor_header *)&as_iso_out_desc,
|
|
|
|
(struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
|
|
(struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
|
|
(struct usb_descriptor_header *)&as_in_header_desc,
|
|
|
|
(struct usb_descriptor_header *)&as_in_type_i_desc,
|
|
|
|
(struct usb_descriptor_header *)&as_in_ep_desc,
|
|
(struct usb_descriptor_header *)&as_iso_in_desc,
|
|
NULL,
|
|
};
|
|
|
|
enum {
|
|
STR_AC_IF,
|
|
STR_USB_OUT_IT,
|
|
STR_USB_OUT_IT_CH_NAMES,
|
|
STR_IO_OUT_OT,
|
|
STR_IO_IN_IT,
|
|
STR_IO_IN_IT_CH_NAMES,
|
|
STR_USB_IN_OT,
|
|
STR_AS_OUT_IF_ALT0,
|
|
STR_AS_OUT_IF_ALT1,
|
|
STR_AS_IN_IF_ALT0,
|
|
STR_AS_IN_IF_ALT1,
|
|
};
|
|
|
|
static struct usb_string strings_uac1[] = {
|
|
[STR_AC_IF].s = "AC Interface",
|
|
[STR_USB_OUT_IT].s = "Playback Input terminal",
|
|
[STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
|
|
[STR_IO_OUT_OT].s = "Playback Output terminal",
|
|
[STR_IO_IN_IT].s = "Capture Input terminal",
|
|
[STR_IO_IN_IT_CH_NAMES].s = "Capture Channels",
|
|
[STR_USB_IN_OT].s = "Capture Output terminal",
|
|
[STR_AS_OUT_IF_ALT0].s = "Playback Inactive",
|
|
[STR_AS_OUT_IF_ALT1].s = "Playback Active",
|
|
[STR_AS_IN_IF_ALT0].s = "Capture Inactive",
|
|
[STR_AS_IN_IF_ALT1].s = "Capture Active",
|
|
{ },
|
|
};
|
|
|
|
static struct usb_gadget_strings str_uac1 = {
|
|
.language = 0x0409, /* en-us */
|
|
.strings = strings_uac1,
|
|
};
|
|
|
|
static struct usb_gadget_strings *uac1_strings[] = {
|
|
&str_uac1,
|
|
NULL,
|
|
};
|
|
|
|
/*
|
|
* This function is an ALSA sound card following USB Audio Class Spec 1.0.
|
|
*/
|
|
|
|
static int audio_set_endpoint_req(struct usb_function *f,
|
|
const struct usb_ctrlrequest *ctrl)
|
|
{
|
|
struct usb_composite_dev *cdev = f->config->cdev;
|
|
int value = -EOPNOTSUPP;
|
|
u16 ep = le16_to_cpu(ctrl->wIndex);
|
|
u16 len = le16_to_cpu(ctrl->wLength);
|
|
u16 w_value = le16_to_cpu(ctrl->wValue);
|
|
|
|
DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
|
|
ctrl->bRequest, w_value, len, ep);
|
|
|
|
switch (ctrl->bRequest) {
|
|
case UAC_SET_CUR:
|
|
value = len;
|
|
break;
|
|
|
|
case UAC_SET_MIN:
|
|
break;
|
|
|
|
case UAC_SET_MAX:
|
|
break;
|
|
|
|
case UAC_SET_RES:
|
|
break;
|
|
|
|
case UAC_SET_MEM:
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
static int audio_get_endpoint_req(struct usb_function *f,
|
|
const struct usb_ctrlrequest *ctrl)
|
|
{
|
|
struct usb_composite_dev *cdev = f->config->cdev;
|
|
int value = -EOPNOTSUPP;
|
|
u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
|
|
u16 len = le16_to_cpu(ctrl->wLength);
|
|
u16 w_value = le16_to_cpu(ctrl->wValue);
|
|
|
|
DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
|
|
ctrl->bRequest, w_value, len, ep);
|
|
|
|
switch (ctrl->bRequest) {
|
|
case UAC_GET_CUR:
|
|
case UAC_GET_MIN:
|
|
case UAC_GET_MAX:
|
|
case UAC_GET_RES:
|
|
value = len;
|
|
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_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 usb_composite_dev *cdev = f->config->cdev;
|
|
struct usb_gadget *gadget = cdev->gadget;
|
|
struct device *dev = &gadget->dev;
|
|
struct f_uac1 *uac1 = func_to_uac1(f);
|
|
int ret = 0;
|
|
|
|
/* No i/f has more than 2 alt settings */
|
|
if (alt > 1) {
|
|
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (intf == uac1->ac_intf) {
|
|
/* Control I/f has only 1 AltSetting - 0 */
|
|
if (alt) {
|
|
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (intf == uac1->as_out_intf) {
|
|
uac1->as_out_alt = alt;
|
|
|
|
if (alt)
|
|
ret = u_audio_start_capture(&uac1->g_audio);
|
|
else
|
|
u_audio_stop_capture(&uac1->g_audio);
|
|
} else if (intf == uac1->as_in_intf) {
|
|
uac1->as_in_alt = alt;
|
|
|
|
if (alt)
|
|
ret = u_audio_start_playback(&uac1->g_audio);
|
|
else
|
|
u_audio_stop_playback(&uac1->g_audio);
|
|
} else {
|
|
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int f_audio_get_alt(struct usb_function *f, unsigned intf)
|
|
{
|
|
struct usb_composite_dev *cdev = f->config->cdev;
|
|
struct usb_gadget *gadget = cdev->gadget;
|
|
struct device *dev = &gadget->dev;
|
|
struct f_uac1 *uac1 = func_to_uac1(f);
|
|
|
|
if (intf == uac1->ac_intf)
|
|
return uac1->ac_alt;
|
|
else if (intf == uac1->as_out_intf)
|
|
return uac1->as_out_alt;
|
|
else if (intf == uac1->as_in_intf)
|
|
return uac1->as_in_alt;
|
|
else
|
|
dev_err(dev, "%s:%d Invalid Interface %d!\n",
|
|
__func__, __LINE__, intf);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
static void f_audio_disable(struct usb_function *f)
|
|
{
|
|
struct f_uac1 *uac1 = func_to_uac1(f);
|
|
|
|
uac1->as_out_alt = 0;
|
|
uac1->as_in_alt = 0;
|
|
|
|
u_audio_stop_capture(&uac1->g_audio);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* audio function driver setup/binding */
|
|
static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
struct usb_composite_dev *cdev = c->cdev;
|
|
struct usb_gadget *gadget = cdev->gadget;
|
|
struct f_uac1 *uac1 = func_to_uac1(f);
|
|
struct g_audio *audio = func_to_g_audio(f);
|
|
struct f_uac1_opts *audio_opts;
|
|
struct usb_ep *ep = NULL;
|
|
struct usb_string *us;
|
|
u8 *sam_freq;
|
|
int rate;
|
|
int status;
|
|
|
|
audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
|
|
|
|
us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
|
|
if (IS_ERR(us))
|
|
return PTR_ERR(us);
|
|
ac_interface_desc.iInterface = us[STR_AC_IF].id;
|
|
usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
|
|
usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
|
|
io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id;
|
|
as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id;
|
|
as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id;
|
|
io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id;
|
|
io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id;
|
|
usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id;
|
|
as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id;
|
|
as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id;
|
|
|
|
/* Set channel numbers */
|
|
usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask);
|
|
usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask);
|
|
as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask);
|
|
as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize;
|
|
as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8;
|
|
io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask);
|
|
io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask);
|
|
as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask);
|
|
as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize;
|
|
as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8;
|
|
|
|
/* Set sample rates */
|
|
rate = audio_opts->c_srate;
|
|
sam_freq = as_out_type_i_desc.tSamFreq[0];
|
|
memcpy(sam_freq, &rate, 3);
|
|
rate = audio_opts->p_srate;
|
|
sam_freq = as_in_type_i_desc.tSamFreq[0];
|
|
memcpy(sam_freq, &rate, 3);
|
|
|
|
/* allocate instance-specific interface IDs, and patch descriptors */
|
|
status = usb_interface_id(c, f);
|
|
if (status < 0)
|
|
goto fail;
|
|
ac_interface_desc.bInterfaceNumber = status;
|
|
uac1->ac_intf = status;
|
|
uac1->ac_alt = 0;
|
|
|
|
status = usb_interface_id(c, f);
|
|
if (status < 0)
|
|
goto fail;
|
|
as_out_interface_alt_0_desc.bInterfaceNumber = status;
|
|
as_out_interface_alt_1_desc.bInterfaceNumber = status;
|
|
ac_header_desc.baInterfaceNr[0] = status;
|
|
uac1->as_out_intf = status;
|
|
uac1->as_out_alt = 0;
|
|
|
|
status = usb_interface_id(c, f);
|
|
if (status < 0)
|
|
goto fail;
|
|
as_in_interface_alt_0_desc.bInterfaceNumber = status;
|
|
as_in_interface_alt_1_desc.bInterfaceNumber = status;
|
|
ac_header_desc.baInterfaceNr[1] = status;
|
|
uac1->as_in_intf = status;
|
|
uac1->as_in_alt = 0;
|
|
|
|
audio->gadget = gadget;
|
|
|
|
status = -ENODEV;
|
|
|
|
/* allocate instance-specific endpoints */
|
|
ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
|
|
if (!ep)
|
|
goto fail;
|
|
audio->out_ep = ep;
|
|
audio->out_ep->desc = &as_out_ep_desc;
|
|
|
|
ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
|
|
if (!ep)
|
|
goto fail;
|
|
audio->in_ep = ep;
|
|
audio->in_ep->desc = &as_in_ep_desc;
|
|
|
|
/* copy descriptors, and track endpoint copies */
|
|
status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
|
|
NULL);
|
|
if (status)
|
|
goto fail;
|
|
|
|
audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
|
|
audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
|
|
audio->params.c_chmask = audio_opts->c_chmask;
|
|
audio->params.c_srate = audio_opts->c_srate;
|
|
audio->params.c_ssize = audio_opts->c_ssize;
|
|
audio->params.p_chmask = audio_opts->p_chmask;
|
|
audio->params.p_srate = audio_opts->p_srate;
|
|
audio->params.p_ssize = audio_opts->p_ssize;
|
|
audio->params.req_number = audio_opts->req_number;
|
|
|
|
status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
|
|
if (status)
|
|
goto err_card_register;
|
|
|
|
return 0;
|
|
|
|
err_card_register:
|
|
usb_free_all_descriptors(f);
|
|
fail:
|
|
return status;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
|
|
{
|
|
return container_of(to_config_group(item), struct f_uac1_opts,
|
|
func_inst.group);
|
|
}
|
|
|
|
static void f_uac1_attr_release(struct config_item *item)
|
|
{
|
|
struct f_uac1_opts *opts = to_f_uac1_opts(item);
|
|
|
|
usb_put_function_instance(&opts->func_inst);
|
|
}
|
|
|
|
static struct configfs_item_operations f_uac1_item_ops = {
|
|
.release = f_uac1_attr_release,
|
|
};
|
|
|
|
#define UAC1_ATTRIBUTE(name) \
|
|
static ssize_t f_uac1_opts_##name##_show( \
|
|
struct config_item *item, \
|
|
char *page) \
|
|
{ \
|
|
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
|
|
int result; \
|
|
\
|
|
mutex_lock(&opts->lock); \
|
|
result = sprintf(page, "%u\n", opts->name); \
|
|
mutex_unlock(&opts->lock); \
|
|
\
|
|
return result; \
|
|
} \
|
|
\
|
|
static ssize_t f_uac1_opts_##name##_store( \
|
|
struct config_item *item, \
|
|
const char *page, size_t len) \
|
|
{ \
|
|
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
|
|
int ret; \
|
|
u32 num; \
|
|
\
|
|
mutex_lock(&opts->lock); \
|
|
if (opts->refcnt) { \
|
|
ret = -EBUSY; \
|
|
goto end; \
|
|
} \
|
|
\
|
|
ret = kstrtou32(page, 0, &num); \
|
|
if (ret) \
|
|
goto end; \
|
|
\
|
|
opts->name = num; \
|
|
ret = len; \
|
|
\
|
|
end: \
|
|
mutex_unlock(&opts->lock); \
|
|
return ret; \
|
|
} \
|
|
\
|
|
CONFIGFS_ATTR(f_uac1_opts_, name)
|
|
|
|
UAC1_ATTRIBUTE(c_chmask);
|
|
UAC1_ATTRIBUTE(c_srate);
|
|
UAC1_ATTRIBUTE(c_ssize);
|
|
UAC1_ATTRIBUTE(p_chmask);
|
|
UAC1_ATTRIBUTE(p_srate);
|
|
UAC1_ATTRIBUTE(p_ssize);
|
|
UAC1_ATTRIBUTE(req_number);
|
|
|
|
static struct configfs_attribute *f_uac1_attrs[] = {
|
|
&f_uac1_opts_attr_c_chmask,
|
|
&f_uac1_opts_attr_c_srate,
|
|
&f_uac1_opts_attr_c_ssize,
|
|
&f_uac1_opts_attr_p_chmask,
|
|
&f_uac1_opts_attr_p_srate,
|
|
&f_uac1_opts_attr_p_ssize,
|
|
&f_uac1_opts_attr_req_number,
|
|
NULL,
|
|
};
|
|
|
|
static const struct config_item_type f_uac1_func_type = {
|
|
.ct_item_ops = &f_uac1_item_ops,
|
|
.ct_attrs = f_uac1_attrs,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
static void f_audio_free_inst(struct usb_function_instance *f)
|
|
{
|
|
struct f_uac1_opts *opts;
|
|
|
|
opts = container_of(f, struct f_uac1_opts, func_inst);
|
|
kfree(opts);
|
|
}
|
|
|
|
static struct usb_function_instance *f_audio_alloc_inst(void)
|
|
{
|
|
struct f_uac1_opts *opts;
|
|
|
|
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
|
|
if (!opts)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mutex_init(&opts->lock);
|
|
opts->func_inst.free_func_inst = f_audio_free_inst;
|
|
|
|
config_group_init_type_name(&opts->func_inst.group, "",
|
|
&f_uac1_func_type);
|
|
|
|
opts->c_chmask = UAC1_DEF_CCHMASK;
|
|
opts->c_srate = UAC1_DEF_CSRATE;
|
|
opts->c_ssize = UAC1_DEF_CSSIZE;
|
|
opts->p_chmask = UAC1_DEF_PCHMASK;
|
|
opts->p_srate = UAC1_DEF_PSRATE;
|
|
opts->p_ssize = UAC1_DEF_PSSIZE;
|
|
opts->req_number = UAC1_DEF_REQ_NUM;
|
|
return &opts->func_inst;
|
|
}
|
|
|
|
static void f_audio_free(struct usb_function *f)
|
|
{
|
|
struct g_audio *audio;
|
|
struct f_uac1_opts *opts;
|
|
|
|
audio = func_to_g_audio(f);
|
|
opts = container_of(f->fi, struct f_uac1_opts, func_inst);
|
|
kfree(audio);
|
|
mutex_lock(&opts->lock);
|
|
--opts->refcnt;
|
|
mutex_unlock(&opts->lock);
|
|
}
|
|
|
|
static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
struct g_audio *audio = func_to_g_audio(f);
|
|
|
|
g_audio_cleanup(audio);
|
|
usb_free_all_descriptors(f);
|
|
|
|
audio->gadget = NULL;
|
|
}
|
|
|
|
static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
|
|
{
|
|
struct f_uac1 *uac1;
|
|
struct f_uac1_opts *opts;
|
|
|
|
/* allocate and initialize one new instance */
|
|
uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
|
|
if (!uac1)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
opts = container_of(fi, struct f_uac1_opts, func_inst);
|
|
mutex_lock(&opts->lock);
|
|
++opts->refcnt;
|
|
mutex_unlock(&opts->lock);
|
|
|
|
uac1->g_audio.func.name = "uac1_func";
|
|
uac1->g_audio.func.bind = f_audio_bind;
|
|
uac1->g_audio.func.unbind = f_audio_unbind;
|
|
uac1->g_audio.func.set_alt = f_audio_set_alt;
|
|
uac1->g_audio.func.get_alt = f_audio_get_alt;
|
|
uac1->g_audio.func.setup = f_audio_setup;
|
|
uac1->g_audio.func.disable = f_audio_disable;
|
|
uac1->g_audio.func.free_func = f_audio_free;
|
|
|
|
return &uac1->g_audio.func;
|
|
}
|
|
|
|
DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Ruslan Bilovol");
|