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linux-sg2042/drivers/usb/gadget/f_uac2.c

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/*
* f_uac2.c -- USB Audio Class 2.0 Function
*
* Copyright (C) 2011
* Yadwinder Singh (yadi.brar01@gmail.com)
* Jaswinder Singh (jaswinder.singh@linaro.org)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
/* Playback(USB-IN) Default Stereo - Fl/Fr */
static int p_chmask = 0x3;
module_param(p_chmask, uint, S_IRUGO);
MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
/* Playback Default 48 KHz */
static int p_srate = 48000;
module_param(p_srate, uint, S_IRUGO);
MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
/* Playback Default 16bits/sample */
static int p_ssize = 2;
module_param(p_ssize, uint, S_IRUGO);
MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
/* Capture(USB-OUT) Default Stereo - Fl/Fr */
static int c_chmask = 0x3;
module_param(c_chmask, uint, S_IRUGO);
MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
/* Capture Default 64 KHz */
static int c_srate = 64000;
module_param(c_srate, uint, S_IRUGO);
MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
/* Capture Default 16bits/sample */
static int c_ssize = 2;
module_param(c_ssize, uint, S_IRUGO);
MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
/* Keep everyone on toes */
#define USB_XFERS 2
/*
* The driver implements a simple UAC_2 topology.
* USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture
* ALSA_Playback -> IT_2 -> OT_4 -> USB-IN
* Capture and Playback sampling rates are independently
* controlled by two clock sources :
* CLK_5 := c_srate, and CLK_6 := p_srate
*/
#define USB_OUT_IT_ID 1
#define IO_IN_IT_ID 2
#define IO_OUT_OT_ID 3
#define USB_IN_OT_ID 4
#define USB_OUT_CLK_ID 5
#define USB_IN_CLK_ID 6
#define CONTROL_ABSENT 0
#define CONTROL_RDONLY 1
#define CONTROL_RDWR 3
#define CLK_FREQ_CTRL 0
#define CLK_VLD_CTRL 2
#define COPY_CTRL 0
#define CONN_CTRL 2
#define OVRLD_CTRL 4
#define CLSTR_CTRL 6
#define UNFLW_CTRL 8
#define OVFLW_CTRL 10
const char *uac2_name = "snd_uac2";
struct uac2_req {
struct uac2_rtd_params *pp; /* parent param */
struct usb_request *req;
};
struct uac2_rtd_params {
struct snd_uac2_chip *uac2; /* parent chip */
bool ep_enabled; /* if the ep is enabled */
/* Size of the ring buffer */
size_t dma_bytes;
unsigned char *dma_area;
struct snd_pcm_substream *ss;
/* Ring buffer */
ssize_t hw_ptr;
void *rbuf;
size_t period_size;
unsigned max_psize;
struct uac2_req ureq[USB_XFERS];
spinlock_t lock;
};
struct snd_uac2_chip {
struct platform_device pdev;
struct platform_driver pdrv;
struct uac2_rtd_params p_prm;
struct uac2_rtd_params c_prm;
struct snd_card *card;
struct snd_pcm *pcm;
};
#define BUFF_SIZE_MAX (PAGE_SIZE * 16)
#define PRD_SIZE_MAX PAGE_SIZE
#define MIN_PERIODS 4
static struct snd_pcm_hardware uac2_pcm_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER
| SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
| SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
.rates = SNDRV_PCM_RATE_CONTINUOUS,
.periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX,
.buffer_bytes_max = BUFF_SIZE_MAX,
.period_bytes_max = PRD_SIZE_MAX,
.periods_min = MIN_PERIODS,
};
struct audio_dev {
u8 ac_intf, ac_alt;
u8 as_out_intf, as_out_alt;
u8 as_in_intf, as_in_alt;
struct usb_ep *in_ep, *out_ep;
struct usb_function func;
/* The ALSA Sound Card it represents on the USB-Client side */
struct snd_uac2_chip uac2;
};
static struct audio_dev *agdev_g;
static inline
struct audio_dev *func_to_agdev(struct usb_function *f)
{
return container_of(f, struct audio_dev, func);
}
static inline
struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u)
{
return container_of(u, struct audio_dev, uac2);
}
static inline
struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p)
{
return container_of(p, struct snd_uac2_chip, pdev);
}
static inline
uint num_channels(uint chanmask)
{
uint num = 0;
while (chanmask) {
num += (chanmask & 1);
chanmask >>= 1;
}
return num;
}
static void
agdev_iso_complete(struct usb_ep *ep, struct usb_request *req)
{
unsigned pending;
unsigned long flags;
bool update_alsa = false;
unsigned char *src, *dst;
int status = req->status;
struct uac2_req *ur = req->context;
struct snd_pcm_substream *substream;
struct uac2_rtd_params *prm = ur->pp;
struct snd_uac2_chip *uac2 = prm->uac2;
/* i/f shutting down */
if (!prm->ep_enabled || req->status == -ESHUTDOWN)
return;
/*
* We can't really do much about bad xfers.
* Afterall, the ISOCH xfers could fail legitimately.
*/
if (status)
pr_debug("%s: iso_complete status(%d) %d/%d\n",
__func__, status, req->actual, req->length);
substream = prm->ss;
/* Do nothing if ALSA isn't active */
if (!substream)
goto exit;
spin_lock_irqsave(&prm->lock, flags);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
src = prm->dma_area + prm->hw_ptr;
req->actual = req->length;
dst = req->buf;
} else {
dst = prm->dma_area + prm->hw_ptr;
src = req->buf;
}
pending = prm->hw_ptr % prm->period_size;
pending += req->actual;
if (pending >= prm->period_size)
update_alsa = true;
prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes;
spin_unlock_irqrestore(&prm->lock, flags);
/* Pack USB load in ALSA ring buffer */
memcpy(dst, src, req->actual);
exit:
if (usb_ep_queue(ep, req, GFP_ATOMIC))
dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
if (update_alsa)
snd_pcm_period_elapsed(substream);
return;
}
static int
uac2_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
struct uac2_rtd_params *prm;
unsigned long flags;
int err = 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
prm = &uac2->p_prm;
else
prm = &uac2->c_prm;
spin_lock_irqsave(&prm->lock, flags);
/* Reset */
prm->hw_ptr = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
prm->ss = substream;
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
prm->ss = NULL;
break;
default:
err = -EINVAL;
}
spin_unlock_irqrestore(&prm->lock, flags);
/* Clear buffer after Play stops */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
memset(prm->rbuf, 0, prm->max_psize * USB_XFERS);
return err;
}
static snd_pcm_uframes_t uac2_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
struct uac2_rtd_params *prm;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
prm = &uac2->p_prm;
else
prm = &uac2->c_prm;
return bytes_to_frames(substream->runtime, prm->hw_ptr);
}
static int uac2_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
struct uac2_rtd_params *prm;
int err;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
prm = &uac2->p_prm;
else
prm = &uac2->c_prm;
err = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
if (err >= 0) {
prm->dma_bytes = substream->runtime->dma_bytes;
prm->dma_area = substream->runtime->dma_area;
prm->period_size = params_period_bytes(hw_params);
}
return err;
}
static int uac2_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
struct uac2_rtd_params *prm;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
prm = &uac2->p_prm;
else
prm = &uac2->c_prm;
prm->dma_area = NULL;
prm->dma_bytes = 0;
prm->period_size = 0;
return snd_pcm_lib_free_pages(substream);
}
static int uac2_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
runtime->hw = uac2_pcm_hardware;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
spin_lock_init(&uac2->p_prm.lock);
runtime->hw.rate_min = p_srate;
runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; /* ! p_ssize ! */
runtime->hw.channels_min = num_channels(p_chmask);
runtime->hw.period_bytes_min = 2 * uac2->p_prm.max_psize
/ runtime->hw.periods_min;
} else {
spin_lock_init(&uac2->c_prm.lock);
runtime->hw.rate_min = c_srate;
runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; /* ! c_ssize ! */
runtime->hw.channels_min = num_channels(c_chmask);
runtime->hw.period_bytes_min = 2 * uac2->c_prm.max_psize
/ runtime->hw.periods_min;
}
runtime->hw.rate_max = runtime->hw.rate_min;
runtime->hw.channels_max = runtime->hw.channels_min;
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
return 0;
}
/* ALSA cries without these function pointers */
static int uac2_pcm_null(struct snd_pcm_substream *substream)
{
return 0;
}
static struct snd_pcm_ops uac2_pcm_ops = {
.open = uac2_pcm_open,
.close = uac2_pcm_null,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = uac2_pcm_hw_params,
.hw_free = uac2_pcm_hw_free,
.trigger = uac2_pcm_trigger,
.pointer = uac2_pcm_pointer,
.prepare = uac2_pcm_null,
};
static int snd_uac2_probe(struct platform_device *pdev)
{
struct snd_uac2_chip *uac2 = pdev_to_uac2(pdev);
struct snd_card *card;
struct snd_pcm *pcm;
int err;
/* Choose any slot, with no id */
err = snd_card_new(&pdev->dev, -1, NULL, THIS_MODULE, 0, &card);
if (err < 0)
return err;
uac2->card = card;
/*
* Create first PCM device
* Create a substream only for non-zero channel streams
*/
err = snd_pcm_new(uac2->card, "UAC2 PCM", 0,
p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
if (err < 0)
goto snd_fail;
strcpy(pcm->name, "UAC2 PCM");
pcm->private_data = uac2;
uac2->pcm = pcm;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac2_pcm_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac2_pcm_ops);
strcpy(card->driver, "UAC2_Gadget");
strcpy(card->shortname, "UAC2_Gadget");
sprintf(card->longname, "UAC2_Gadget %i", pdev->id);
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX);
err = snd_card_register(card);
if (!err) {
platform_set_drvdata(pdev, card);
return 0;
}
snd_fail:
snd_card_free(card);
uac2->pcm = NULL;
uac2->card = NULL;
return err;
}
static int snd_uac2_remove(struct platform_device *pdev)
{
struct snd_card *card = platform_get_drvdata(pdev);
if (card)
return snd_card_free(card);
return 0;
}
static int alsa_uac2_init(struct audio_dev *agdev)
{
struct snd_uac2_chip *uac2 = &agdev->uac2;
int err;
uac2->pdrv.probe = snd_uac2_probe;
uac2->pdrv.remove = snd_uac2_remove;
uac2->pdrv.driver.name = uac2_name;
uac2->pdev.id = 0;
uac2->pdev.name = uac2_name;
/* Register snd_uac2 driver */
err = platform_driver_register(&uac2->pdrv);
if (err)
return err;
/* Register snd_uac2 device */
err = platform_device_register(&uac2->pdev);
if (err)
platform_driver_unregister(&uac2->pdrv);
return err;
}
static void alsa_uac2_exit(struct audio_dev *agdev)
{
struct snd_uac2_chip *uac2 = &agdev->uac2;
platform_driver_unregister(&uac2->pdrv);
platform_device_unregister(&uac2->pdev);
}
/* --------- USB Function Interface ------------- */
enum {
STR_ASSOC,
STR_IF_CTRL,
STR_CLKSRC_IN,
STR_CLKSRC_OUT,
STR_USB_IT,
STR_IO_IT,
STR_USB_OT,
STR_IO_OT,
STR_AS_OUT_ALT0,
STR_AS_OUT_ALT1,
STR_AS_IN_ALT0,
STR_AS_IN_ALT1,
};
static char clksrc_in[8];
static char clksrc_out[8];
static struct usb_string strings_fn[] = {
[STR_ASSOC].s = "Source/Sink",
[STR_IF_CTRL].s = "Topology Control",
[STR_CLKSRC_IN].s = clksrc_in,
[STR_CLKSRC_OUT].s = clksrc_out,
[STR_USB_IT].s = "USBH Out",
[STR_IO_IT].s = "USBD Out",
[STR_USB_OT].s = "USBH In",
[STR_IO_OT].s = "USBD In",
[STR_AS_OUT_ALT0].s = "Playback Inactive",
[STR_AS_OUT_ALT1].s = "Playback Active",
[STR_AS_IN_ALT0].s = "Capture Inactive",
[STR_AS_IN_ALT1].s = "Capture Active",
{ },
};
static struct usb_gadget_strings str_fn = {
.language = 0x0409, /* en-us */
.strings = strings_fn,
};
static struct usb_gadget_strings *fn_strings[] = {
&str_fn,
NULL,
};
static struct usb_qualifier_descriptor devqual_desc = {
.bLength = sizeof devqual_desc,
.bDescriptorType = USB_DT_DEVICE_QUALIFIER,
.bcdUSB = cpu_to_le16(0x200),
.bDeviceClass = USB_CLASS_MISC,
.bDeviceSubClass = 0x02,
.bDeviceProtocol = 0x01,
.bNumConfigurations = 1,
.bRESERVED = 0,
};
static struct usb_interface_assoc_descriptor iad_desc = {
.bLength = sizeof iad_desc,
.bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
.bFirstInterface = 0,
.bInterfaceCount = 3,
.bFunctionClass = USB_CLASS_AUDIO,
.bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
.bFunctionProtocol = UAC_VERSION_2,
};
/* Audio Control Interface */
static struct usb_interface_descriptor std_ac_if_desc = {
.bLength = sizeof std_ac_if_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
.bInterfaceProtocol = UAC_VERSION_2,
};
/* Clock source for IN traffic */
struct uac_clock_source_descriptor in_clk_src_desc = {
.bLength = sizeof in_clk_src_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC2_CLOCK_SOURCE,
.bClockID = USB_IN_CLK_ID,
.bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
.bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
.bAssocTerminal = 0,
};
/* Clock source for OUT traffic */
struct uac_clock_source_descriptor out_clk_src_desc = {
.bLength = sizeof out_clk_src_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC2_CLOCK_SOURCE,
.bClockID = USB_OUT_CLK_ID,
.bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
.bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
.bAssocTerminal = 0,
};
/* Input Terminal for USB_OUT */
struct uac2_input_terminal_descriptor usb_out_it_desc = {
.bLength = sizeof usb_out_it_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_INPUT_TERMINAL,
.bTerminalID = USB_OUT_IT_ID,
.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
.bAssocTerminal = 0,
.bCSourceID = USB_OUT_CLK_ID,
.iChannelNames = 0,
.bmControls = (CONTROL_RDWR << COPY_CTRL),
};
/* Input Terminal for I/O-In */
struct uac2_input_terminal_descriptor io_in_it_desc = {
.bLength = sizeof io_in_it_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_INPUT_TERMINAL,
.bTerminalID = IO_IN_IT_ID,
.wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED),
.bAssocTerminal = 0,
.bCSourceID = USB_IN_CLK_ID,
.iChannelNames = 0,
.bmControls = (CONTROL_RDWR << COPY_CTRL),
};
/* Ouput Terminal for USB_IN */
struct uac2_output_terminal_descriptor usb_in_ot_desc = {
.bLength = sizeof usb_in_ot_desc,
.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,
.bCSourceID = USB_IN_CLK_ID,
.bmControls = (CONTROL_RDWR << COPY_CTRL),
};
/* Ouput Terminal for I/O-Out */
struct uac2_output_terminal_descriptor io_out_ot_desc = {
.bLength = sizeof io_out_ot_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
.bTerminalID = IO_OUT_OT_ID,
.wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED),
.bAssocTerminal = 0,
.bSourceID = USB_OUT_IT_ID,
.bCSourceID = USB_OUT_CLK_ID,
.bmControls = (CONTROL_RDWR << COPY_CTRL),
};
struct uac2_ac_header_descriptor ac_hdr_desc = {
.bLength = sizeof ac_hdr_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_MS_HEADER,
.bcdADC = cpu_to_le16(0x200),
.bCategory = UAC2_FUNCTION_IO_BOX,
.wTotalLength = sizeof in_clk_src_desc + sizeof out_clk_src_desc
+ sizeof usb_out_it_desc + sizeof io_in_it_desc
+ sizeof usb_in_ot_desc + sizeof io_out_ot_desc,
.bmControls = 0,
};
/* Audio Streaming OUT Interface - Alt0 */
static struct usb_interface_descriptor std_as_out_if0_desc = {
.bLength = sizeof std_as_out_if0_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
.bInterfaceProtocol = UAC_VERSION_2,
};
/* Audio Streaming OUT Interface - Alt1 */
static struct usb_interface_descriptor std_as_out_if1_desc = {
.bLength = sizeof std_as_out_if1_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 1,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
.bInterfaceProtocol = UAC_VERSION_2,
};
/* Audio Stream OUT Intface Desc */
struct uac2_as_header_descriptor as_out_hdr_desc = {
.bLength = sizeof as_out_hdr_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_AS_GENERAL,
.bTerminalLink = USB_OUT_IT_ID,
.bmControls = 0,
.bFormatType = UAC_FORMAT_TYPE_I,
.bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
.iChannelNames = 0,
};
/* Audio USB_OUT Format */
struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
.bLength = sizeof as_out_fmt1_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_FORMAT_TYPE,
.bFormatType = UAC_FORMAT_TYPE_I,
};
/* STD AS ISO OUT Endpoint */
struct usb_endpoint_descriptor fs_epout_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
.bInterval = 1,
};
struct usb_endpoint_descriptor hs_epout_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
.bInterval = 4,
};
/* CS AS ISO OUT Endpoint */
static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
.bLength = sizeof as_iso_out_desc,
.bDescriptorType = USB_DT_CS_ENDPOINT,
.bDescriptorSubtype = UAC_EP_GENERAL,
.bmAttributes = 0,
.bmControls = 0,
.bLockDelayUnits = 0,
.wLockDelay = 0,
};
/* Audio Streaming IN Interface - Alt0 */
static struct usb_interface_descriptor std_as_in_if0_desc = {
.bLength = sizeof std_as_in_if0_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
.bInterfaceProtocol = UAC_VERSION_2,
};
/* Audio Streaming IN Interface - Alt1 */
static struct usb_interface_descriptor std_as_in_if1_desc = {
.bLength = sizeof std_as_in_if1_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 1,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
.bInterfaceProtocol = UAC_VERSION_2,
};
/* Audio Stream IN Intface Desc */
struct uac2_as_header_descriptor as_in_hdr_desc = {
.bLength = sizeof as_in_hdr_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_AS_GENERAL,
.bTerminalLink = USB_IN_OT_ID,
.bmControls = 0,
.bFormatType = UAC_FORMAT_TYPE_I,
.bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
.iChannelNames = 0,
};
/* Audio USB_IN Format */
struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
.bLength = sizeof as_in_fmt1_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_FORMAT_TYPE,
.bFormatType = UAC_FORMAT_TYPE_I,
};
/* STD AS ISO IN Endpoint */
struct usb_endpoint_descriptor fs_epin_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
.bInterval = 1,
};
struct usb_endpoint_descriptor hs_epin_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
.bInterval = 4,
};
/* CS AS ISO IN Endpoint */
static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
.bLength = sizeof as_iso_in_desc,
.bDescriptorType = USB_DT_CS_ENDPOINT,
.bDescriptorSubtype = UAC_EP_GENERAL,
.bmAttributes = 0,
.bmControls = 0,
.bLockDelayUnits = 0,
.wLockDelay = 0,
};
static struct usb_descriptor_header *fs_audio_desc[] = {
(struct usb_descriptor_header *)&iad_desc,
(struct usb_descriptor_header *)&std_ac_if_desc,
(struct usb_descriptor_header *)&ac_hdr_desc,
(struct usb_descriptor_header *)&in_clk_src_desc,
(struct usb_descriptor_header *)&out_clk_src_desc,
(struct usb_descriptor_header *)&usb_out_it_desc,
(struct usb_descriptor_header *)&io_in_it_desc,
(struct usb_descriptor_header *)&usb_in_ot_desc,
(struct usb_descriptor_header *)&io_out_ot_desc,
(struct usb_descriptor_header *)&std_as_out_if0_desc,
(struct usb_descriptor_header *)&std_as_out_if1_desc,
(struct usb_descriptor_header *)&as_out_hdr_desc,
(struct usb_descriptor_header *)&as_out_fmt1_desc,
(struct usb_descriptor_header *)&fs_epout_desc,
(struct usb_descriptor_header *)&as_iso_out_desc,
(struct usb_descriptor_header *)&std_as_in_if0_desc,
(struct usb_descriptor_header *)&std_as_in_if1_desc,
(struct usb_descriptor_header *)&as_in_hdr_desc,
(struct usb_descriptor_header *)&as_in_fmt1_desc,
(struct usb_descriptor_header *)&fs_epin_desc,
(struct usb_descriptor_header *)&as_iso_in_desc,
NULL,
};
static struct usb_descriptor_header *hs_audio_desc[] = {
(struct usb_descriptor_header *)&iad_desc,
(struct usb_descriptor_header *)&std_ac_if_desc,
(struct usb_descriptor_header *)&ac_hdr_desc,
(struct usb_descriptor_header *)&in_clk_src_desc,
(struct usb_descriptor_header *)&out_clk_src_desc,
(struct usb_descriptor_header *)&usb_out_it_desc,
(struct usb_descriptor_header *)&io_in_it_desc,
(struct usb_descriptor_header *)&usb_in_ot_desc,
(struct usb_descriptor_header *)&io_out_ot_desc,
(struct usb_descriptor_header *)&std_as_out_if0_desc,
(struct usb_descriptor_header *)&std_as_out_if1_desc,
(struct usb_descriptor_header *)&as_out_hdr_desc,
(struct usb_descriptor_header *)&as_out_fmt1_desc,
(struct usb_descriptor_header *)&hs_epout_desc,
(struct usb_descriptor_header *)&as_iso_out_desc,
(struct usb_descriptor_header *)&std_as_in_if0_desc,
(struct usb_descriptor_header *)&std_as_in_if1_desc,
(struct usb_descriptor_header *)&as_in_hdr_desc,
(struct usb_descriptor_header *)&as_in_fmt1_desc,
(struct usb_descriptor_header *)&hs_epin_desc,
(struct usb_descriptor_header *)&as_iso_in_desc,
NULL,
};
struct cntrl_cur_lay3 {
__u32 dCUR;
};
struct cntrl_range_lay3 {
__u16 wNumSubRanges;
__u32 dMIN;
__u32 dMAX;
__u32 dRES;
} __packed;
static inline void
free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep)
{
struct snd_uac2_chip *uac2 = prm->uac2;
int i;
prm->ep_enabled = false;
for (i = 0; i < USB_XFERS; i++) {
if (prm->ureq[i].req) {
usb_ep_dequeue(ep, prm->ureq[i].req);
usb_ep_free_request(ep, prm->ureq[i].req);
prm->ureq[i].req = NULL;
}
}
if (usb_ep_disable(ep))
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
}
static int __init
afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
{
struct audio_dev *agdev = func_to_agdev(fn);
struct snd_uac2_chip *uac2 = &agdev->uac2;
struct usb_composite_dev *cdev = cfg->cdev;
struct usb_gadget *gadget = cdev->gadget;
struct uac2_rtd_params *prm;
int ret;
ret = usb_interface_id(cfg, fn);
if (ret < 0) {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
return ret;
}
std_ac_if_desc.bInterfaceNumber = ret;
agdev->ac_intf = ret;
agdev->ac_alt = 0;
ret = usb_interface_id(cfg, fn);
if (ret < 0) {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
return ret;
}
std_as_out_if0_desc.bInterfaceNumber = ret;
std_as_out_if1_desc.bInterfaceNumber = ret;
agdev->as_out_intf = ret;
agdev->as_out_alt = 0;
ret = usb_interface_id(cfg, fn);
if (ret < 0) {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
return ret;
}
std_as_in_if0_desc.bInterfaceNumber = ret;
std_as_in_if1_desc.bInterfaceNumber = ret;
agdev->as_in_intf = ret;
agdev->as_in_alt = 0;
agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
if (!agdev->out_ep) {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
goto err;
}
agdev->out_ep->driver_data = agdev;
agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
if (!agdev->in_ep) {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
goto err;
}
agdev->in_ep->driver_data = agdev;
uac2->p_prm.uac2 = uac2;
uac2->c_prm.uac2 = uac2;
hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
hs_epout_desc.wMaxPacketSize = fs_epout_desc.wMaxPacketSize;
hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
hs_epin_desc.wMaxPacketSize = fs_epin_desc.wMaxPacketSize;
ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL);
if (ret)
goto err;
prm = &agdev->uac2.c_prm;
prm->max_psize = hs_epout_desc.wMaxPacketSize;
prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
if (!prm->rbuf) {
prm->max_psize = 0;
goto err;
}
prm = &agdev->uac2.p_prm;
prm->max_psize = hs_epin_desc.wMaxPacketSize;
prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
if (!prm->rbuf) {
prm->max_psize = 0;
goto err;
}
ret = alsa_uac2_init(agdev);
if (ret)
goto err;
return 0;
err:
kfree(agdev->uac2.p_prm.rbuf);
kfree(agdev->uac2.c_prm.rbuf);
usb_free_all_descriptors(fn);
if (agdev->in_ep)
agdev->in_ep->driver_data = NULL;
if (agdev->out_ep)
agdev->out_ep->driver_data = NULL;
return -EINVAL;
}
static void
afunc_unbind(struct usb_configuration *cfg, struct usb_function *fn)
{
struct audio_dev *agdev = func_to_agdev(fn);
struct uac2_rtd_params *prm;
alsa_uac2_exit(agdev);
prm = &agdev->uac2.p_prm;
kfree(prm->rbuf);
prm = &agdev->uac2.c_prm;
kfree(prm->rbuf);
usb_free_all_descriptors(fn);
if (agdev->in_ep)
agdev->in_ep->driver_data = NULL;
if (agdev->out_ep)
agdev->out_ep->driver_data = NULL;
}
static int
afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
{
struct usb_composite_dev *cdev = fn->config->cdev;
struct audio_dev *agdev = func_to_agdev(fn);
struct snd_uac2_chip *uac2 = &agdev->uac2;
struct usb_gadget *gadget = cdev->gadget;
struct usb_request *req;
struct usb_ep *ep;
struct uac2_rtd_params *prm;
int i;
/* No i/f has more than 2 alt settings */
if (alt > 1) {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
return -EINVAL;
}
if (intf == agdev->ac_intf) {
/* Control I/f has only 1 AltSetting - 0 */
if (alt) {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
return -EINVAL;
}
return 0;
}
if (intf == agdev->as_out_intf) {
ep = agdev->out_ep;
prm = &uac2->c_prm;
config_ep_by_speed(gadget, fn, ep);
agdev->as_out_alt = alt;
} else if (intf == agdev->as_in_intf) {
ep = agdev->in_ep;
prm = &uac2->p_prm;
config_ep_by_speed(gadget, fn, ep);
agdev->as_in_alt = alt;
} else {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
return -EINVAL;
}
if (alt == 0) {
free_ep(prm, ep);
return 0;
}
prm->ep_enabled = true;
usb_ep_enable(ep);
for (i = 0; i < USB_XFERS; i++) {
if (prm->ureq[i].req) {
if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
dev_err(&uac2->pdev.dev, "%d Error!\n",
__LINE__);
continue;
}
req = usb_ep_alloc_request(ep, GFP_ATOMIC);
if (req == NULL) {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
return -EINVAL;
}
prm->ureq[i].req = req;
prm->ureq[i].pp = prm;
req->zero = 0;
req->context = &prm->ureq[i];
req->length = prm->max_psize;
req->complete = agdev_iso_complete;
req->buf = prm->rbuf + i * req->length;
if (usb_ep_queue(ep, req, GFP_ATOMIC))
dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
}
return 0;
}
static int
afunc_get_alt(struct usb_function *fn, unsigned intf)
{
struct audio_dev *agdev = func_to_agdev(fn);
struct snd_uac2_chip *uac2 = &agdev->uac2;
if (intf == agdev->ac_intf)
return agdev->ac_alt;
else if (intf == agdev->as_out_intf)
return agdev->as_out_alt;
else if (intf == agdev->as_in_intf)
return agdev->as_in_alt;
else
dev_err(&uac2->pdev.dev,
"%s:%d Invalid Interface %d!\n",
__func__, __LINE__, intf);
return -EINVAL;
}
static void
afunc_disable(struct usb_function *fn)
{
struct audio_dev *agdev = func_to_agdev(fn);
struct snd_uac2_chip *uac2 = &agdev->uac2;
free_ep(&uac2->p_prm, agdev->in_ep);
agdev->as_in_alt = 0;
free_ep(&uac2->c_prm, agdev->out_ep);
agdev->as_out_alt = 0;
}
static int
in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
struct audio_dev *agdev = func_to_agdev(fn);
struct snd_uac2_chip *uac2 = &agdev->uac2;
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
u16 w_value = le16_to_cpu(cr->wValue);
u8 entity_id = (w_index >> 8) & 0xff;
u8 control_selector = w_value >> 8;
int value = -EOPNOTSUPP;
if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
struct cntrl_cur_lay3 c;
if (entity_id == USB_IN_CLK_ID)
c.dCUR = p_srate;
else if (entity_id == USB_OUT_CLK_ID)
c.dCUR = c_srate;
value = min_t(unsigned, w_length, sizeof c);
memcpy(req->buf, &c, value);
} else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
*(u8 *)req->buf = 1;
value = min_t(unsigned, w_length, 1);
} else {
dev_err(&uac2->pdev.dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
return value;
}
static int
in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
struct audio_dev *agdev = func_to_agdev(fn);
struct snd_uac2_chip *uac2 = &agdev->uac2;
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
u16 w_value = le16_to_cpu(cr->wValue);
u8 entity_id = (w_index >> 8) & 0xff;
u8 control_selector = w_value >> 8;
struct cntrl_range_lay3 r;
int value = -EOPNOTSUPP;
if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
if (entity_id == USB_IN_CLK_ID)
r.dMIN = p_srate;
else if (entity_id == USB_OUT_CLK_ID)
r.dMIN = c_srate;
else
return -EOPNOTSUPP;
r.dMAX = r.dMIN;
r.dRES = 0;
r.wNumSubRanges = 1;
value = min_t(unsigned, w_length, sizeof r);
memcpy(req->buf, &r, value);
} else {
dev_err(&uac2->pdev.dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
return value;
}
static int
ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
if (cr->bRequest == UAC2_CS_CUR)
return in_rq_cur(fn, cr);
else if (cr->bRequest == UAC2_CS_RANGE)
return in_rq_range(fn, cr);
else
return -EOPNOTSUPP;
}
static int
out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_value = le16_to_cpu(cr->wValue);
u8 control_selector = w_value >> 8;
if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
return w_length;
return -EOPNOTSUPP;
}
static int
setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct audio_dev *agdev = func_to_agdev(fn);
struct snd_uac2_chip *uac2 = &agdev->uac2;
u16 w_index = le16_to_cpu(cr->wIndex);
u8 intf = w_index & 0xff;
if (intf != agdev->ac_intf) {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
return -EOPNOTSUPP;
}
if (cr->bRequestType & USB_DIR_IN)
return ac_rq_in(fn, cr);
else if (cr->bRequest == UAC2_CS_CUR)
return out_rq_cur(fn, cr);
return -EOPNOTSUPP;
}
static int
afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_composite_dev *cdev = fn->config->cdev;
struct audio_dev *agdev = func_to_agdev(fn);
struct snd_uac2_chip *uac2 = &agdev->uac2;
struct usb_request *req = cdev->req;
u16 w_length = le16_to_cpu(cr->wLength);
int value = -EOPNOTSUPP;
/* Only Class specific requests are supposed to reach here */
if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
return -EOPNOTSUPP;
if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
value = setup_rq_inf(fn, cr);
else
dev_err(&uac2->pdev.dev, "%s:%d Error!\n", __func__, __LINE__);
if (value >= 0) {
req->length = value;
req->zero = value < w_length;
value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
if (value < 0) {
dev_err(&uac2->pdev.dev,
"%s:%d Error!\n", __func__, __LINE__);
req->status = 0;
}
}
return value;
}
static int audio_bind_config(struct usb_configuration *cfg)
{
int res;
agdev_g = kzalloc(sizeof *agdev_g, GFP_KERNEL);
if (agdev_g == NULL)
return -ENOMEM;
res = usb_string_ids_tab(cfg->cdev, strings_fn);
if (res)
return res;
iad_desc.iFunction = strings_fn[STR_ASSOC].id;
std_ac_if_desc.iInterface = strings_fn[STR_IF_CTRL].id;
in_clk_src_desc.iClockSource = strings_fn[STR_CLKSRC_IN].id;
out_clk_src_desc.iClockSource = strings_fn[STR_CLKSRC_OUT].id;
usb_out_it_desc.iTerminal = strings_fn[STR_USB_IT].id;
io_in_it_desc.iTerminal = strings_fn[STR_IO_IT].id;
usb_in_ot_desc.iTerminal = strings_fn[STR_USB_OT].id;
io_out_ot_desc.iTerminal = strings_fn[STR_IO_OT].id;
std_as_out_if0_desc.iInterface = strings_fn[STR_AS_OUT_ALT0].id;
std_as_out_if1_desc.iInterface = strings_fn[STR_AS_OUT_ALT1].id;
std_as_in_if0_desc.iInterface = strings_fn[STR_AS_IN_ALT0].id;
std_as_in_if1_desc.iInterface = strings_fn[STR_AS_IN_ALT1].id;
agdev_g->func.name = "uac2_func";
agdev_g->func.strings = fn_strings;
agdev_g->func.bind = afunc_bind;
agdev_g->func.unbind = afunc_unbind;
agdev_g->func.set_alt = afunc_set_alt;
agdev_g->func.get_alt = afunc_get_alt;
agdev_g->func.disable = afunc_disable;
agdev_g->func.setup = afunc_setup;
/* Initialize the configurable parameters */
usb_out_it_desc.bNrChannels = num_channels(c_chmask);
usb_out_it_desc.bmChannelConfig = cpu_to_le32(c_chmask);
io_in_it_desc.bNrChannels = num_channels(p_chmask);
io_in_it_desc.bmChannelConfig = cpu_to_le32(p_chmask);
as_out_hdr_desc.bNrChannels = num_channels(c_chmask);
as_out_hdr_desc.bmChannelConfig = cpu_to_le32(c_chmask);
as_in_hdr_desc.bNrChannels = num_channels(p_chmask);
as_in_hdr_desc.bmChannelConfig = cpu_to_le32(p_chmask);
as_out_fmt1_desc.bSubslotSize = c_ssize;
as_out_fmt1_desc.bBitResolution = c_ssize * 8;
as_in_fmt1_desc.bSubslotSize = p_ssize;
as_in_fmt1_desc.bBitResolution = p_ssize * 8;
snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", p_srate);
snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", c_srate);
res = usb_add_function(cfg, &agdev_g->func);
if (res < 0)
kfree(agdev_g);
return res;
}
static void
uac2_unbind_config(struct usb_configuration *cfg)
{
kfree(agdev_g);
agdev_g = NULL;
}
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