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linux/drivers/usb/gadget/function/f_uac1.c

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// 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;
uac1->as_out_intf = status;
uac1->as_out_alt = 0;
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
as_in_interface_alt_0_desc.bInterfaceNumber = status;
as_in_interface_alt_1_desc.bInterfaceNumber = status;
uac1->as_in_intf = status;
uac1->as_in_alt = 0;
audio->gadget = gadget;
status = -ENODEV;
/* allocate instance-specific endpoints */
ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
if (!ep)
goto fail;
audio->out_ep = ep;
audio->out_ep->desc = &as_out_ep_desc;
ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
if (!ep)
goto fail;
audio->in_ep = ep;
audio->in_ep->desc = &as_in_ep_desc;
/* copy descriptors, and track endpoint copies */
status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
NULL);
if (status)
goto fail;
audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
audio->params.c_chmask = audio_opts->c_chmask;
audio->params.c_srate = audio_opts->c_srate;
audio->params.c_ssize = audio_opts->c_ssize;
audio->params.p_chmask = audio_opts->p_chmask;
audio->params.p_srate = audio_opts->p_srate;
audio->params.p_ssize = audio_opts->p_ssize;
audio->params.req_number = audio_opts->req_number;
status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
if (status)
goto err_card_register;
return 0;
err_card_register:
usb_free_all_descriptors(f);
fail:
return status;
}
/*-------------------------------------------------------------------------*/
static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_uac1_opts,
func_inst.group);
}
static void f_uac1_attr_release(struct config_item *item)
{
struct f_uac1_opts *opts = to_f_uac1_opts(item);
usb_put_function_instance(&opts->func_inst);
}
static struct configfs_item_operations f_uac1_item_ops = {
.release = f_uac1_attr_release,
};
#define UAC1_ATTRIBUTE(name) \
static ssize_t f_uac1_opts_##name##_show( \
struct config_item *item, \
char *page) \
{ \
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
int result; \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", opts->name); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t f_uac1_opts_##name##_store( \
struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
int ret; \
u32 num; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
ret = kstrtou32(page, 0, &num); \
if (ret) \
goto end; \
\
opts->name = num; \
ret = len; \
\
end: \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
CONFIGFS_ATTR(f_uac1_opts_, name)
UAC1_ATTRIBUTE(c_chmask);
UAC1_ATTRIBUTE(c_srate);
UAC1_ATTRIBUTE(c_ssize);
UAC1_ATTRIBUTE(p_chmask);
UAC1_ATTRIBUTE(p_srate);
UAC1_ATTRIBUTE(p_ssize);
UAC1_ATTRIBUTE(req_number);
static struct configfs_attribute *f_uac1_attrs[] = {
&f_uac1_opts_attr_c_chmask,
&f_uac1_opts_attr_c_srate,
&f_uac1_opts_attr_c_ssize,
&f_uac1_opts_attr_p_chmask,
&f_uac1_opts_attr_p_srate,
&f_uac1_opts_attr_p_ssize,
&f_uac1_opts_attr_req_number,
NULL,
};
static 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");
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