--- /dev/null
+/*
+ * 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>
+
+#include "u_uac2.h"
+
+/* 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
+
+static 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;
+
+ /* timekeeping for the playback endpoint */
+ unsigned int p_interval;
+ unsigned int p_residue;
+
+ /* pre-calculated values for playback iso completion */
+ unsigned int p_pktsize;
+ unsigned int p_pktsize_residue;
+ unsigned int p_framesize;
+};
+
+#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 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
+struct f_uac2_opts *agdev_to_uac2_opts(struct audio_dev *agdev)
+{
+ return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
+}
+
+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;
+ unsigned int hw_ptr;
+ bool update_alsa = false;
+ 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) {
+ /*
+ * For each IN packet, take the quotient of the current data
+ * rate and the endpoint's interval as the base packet size.
+ * If there is a residue from this division, add it to the
+ * residue accumulator.
+ */
+ req->length = uac2->p_pktsize;
+ uac2->p_residue += uac2->p_pktsize_residue;
+
+ /*
+ * Whenever there are more bytes in the accumulator than we
+ * need to add one more sample frame, increase this packet's
+ * size and decrease the accumulator.
+ */
+ if (uac2->p_residue / uac2->p_interval >= uac2->p_framesize) {
+ req->length += uac2->p_framesize;
+ uac2->p_residue -= uac2->p_framesize *
+ uac2->p_interval;
+ }
+
+ req->actual = req->length;
+ }
+
+ pending = prm->hw_ptr % prm->period_size;
+ pending += req->actual;
+ if (pending >= prm->period_size)
+ update_alsa = true;
+
+ hw_ptr = prm->hw_ptr;
+ prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes;
+
+ spin_unlock_irqrestore(&prm->lock, flags);
+
+ /* Pack USB load in ALSA ring buffer */
+ pending = prm->dma_bytes - hw_ptr;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ if (unlikely(pending < req->actual)) {
+ memcpy(req->buf, prm->dma_area + hw_ptr, pending);
+ memcpy(req->buf + pending, prm->dma_area,
+ req->actual - pending);
+ } else {
+ memcpy(req->buf, prm->dma_area + hw_ptr, req->actual);
+ }
+ } else {
+ if (unlikely(pending < req->actual)) {
+ memcpy(prm->dma_area + hw_ptr, req->buf, pending);
+ memcpy(prm->dma_area, req->buf + pending,
+ req->actual - pending);
+ } else {
+ memcpy(prm->dma_area + hw_ptr, req->buf, 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;
+ struct audio_dev *audio_dev;
+ struct f_uac2_opts *opts;
+ int p_ssize, c_ssize;
+ int p_srate, c_srate;
+ int p_chmask, c_chmask;
+
+ audio_dev = uac2_to_agdev(uac2);
+ opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
+ p_ssize = opts->p_ssize;
+ c_ssize = opts->c_ssize;
+ p_srate = opts->p_srate;
+ c_srate = opts->c_srate;
+ p_chmask = opts->p_chmask;
+ c_chmask = opts->c_chmask;
+ uac2->p_residue = 0;
+
+ 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;
+ switch (p_ssize) {
+ case 3:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
+ break;
+ case 4:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
+ break;
+ default:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
+ break;
+ }
+ 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;
+ switch (c_ssize) {
+ case 3:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
+ break;
+ case 4:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
+ break;
+ default:
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
+ break;
+ }
+ 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;
+ struct audio_dev *audio_dev;
+ struct f_uac2_opts *opts;
+ int err;
+ int p_chmask, c_chmask;
+
+ audio_dev = uac2_to_agdev(uac2);
+ opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
+ p_chmask = opts->p_chmask;
+ c_chmask = opts->c_chmask;
+
+ /* 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 void snd_uac2_release(struct device *dev)
+{
+ dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
+}
+
+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;
+ uac2->pdev.dev.release = snd_uac2_release;
+
+ /* 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 */
+static 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 */
+static 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 */
+static 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 */
+static 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 */
+static 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 */
+static 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),
+};
+
+static 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 */
+static 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 */
+static 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 */
+static 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,
+ .wMaxPacketSize = cpu_to_le16(1023),
+ .bInterval = 1,
+};
+
+static 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,
+ .wMaxPacketSize = cpu_to_le16(1024),
+ .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 */
+static 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 */
+static 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 */
+static 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,
+ .wMaxPacketSize = cpu_to_le16(1023),
+ .bInterval = 1,
+};
+
+static 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,
+ .wMaxPacketSize = cpu_to_le16(1024),
+ .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;
+
+ if (!prm->ep_enabled)
+ return;
+
+ 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
+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 device *dev = &uac2->pdev.dev;
+ struct uac2_rtd_params *prm;
+ struct f_uac2_opts *uac2_opts;
+ struct usb_string *us;
+ int ret;
+
+ uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst);
+
+ us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
+ if (IS_ERR(us))
+ return PTR_ERR(us);
+ iad_desc.iFunction = us[STR_ASSOC].id;
+ std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
+ in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
+ out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
+ usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
+ io_in_it_desc.iTerminal = us[STR_IO_IT].id;
+ usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
+ io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
+ std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
+ std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
+ std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
+ std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
+
+
+ /* Initialize the configurable parameters */
+ usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
+ usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
+ io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
+ io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
+ as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
+ as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
+ as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
+ as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
+ as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
+ as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
+ as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
+ as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
+
+ snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate);
+ snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate);
+
+ ret = usb_interface_id(cfg, fn);
+ if (ret < 0) {
+ dev_err(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(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(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(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(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_free_descs;
+ }
+
+ 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_free_descs;
+ }
+
+ ret = alsa_uac2_init(agdev);
+ if (ret)
+ goto err_free_descs;
+ return 0;
+
+err_free_descs:
+ usb_free_all_descriptors(fn);
+err:
+ kfree(agdev->uac2.p_prm.rbuf);
+ kfree(agdev->uac2.c_prm.rbuf);
+ if (agdev->in_ep)
+ agdev->in_ep->driver_data = NULL;
+ if (agdev->out_ep)
+ agdev->out_ep->driver_data = NULL;
+ return -EINVAL;
+}
+
+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 device *dev = &uac2->pdev.dev;
+ struct usb_request *req;
+ struct usb_ep *ep;
+ struct uac2_rtd_params *prm;
+ int req_len, i;
+
+ /* 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 == agdev->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 == agdev->as_out_intf) {
+ ep = agdev->out_ep;
+ prm = &uac2->c_prm;
+ config_ep_by_speed(gadget, fn, ep);
+ agdev->as_out_alt = alt;
+ req_len = prm->max_psize;
+ } else if (intf == agdev->as_in_intf) {
+ struct f_uac2_opts *opts = agdev_to_uac2_opts(agdev);
+ unsigned int factor, rate;
+ struct usb_endpoint_descriptor *ep_desc;
+
+ ep = agdev->in_ep;
+ prm = &uac2->p_prm;
+ config_ep_by_speed(gadget, fn, ep);
+ agdev->as_in_alt = alt;
+
+ /* pre-calculate the playback endpoint's interval */
+ if (gadget->speed == USB_SPEED_FULL) {
+ ep_desc = &fs_epin_desc;
+ factor = 1000;
+ } else {
+ ep_desc = &hs_epin_desc;
+ factor = 125;
+ }
+
+ /* pre-compute some values for iso_complete() */
+ uac2->p_framesize = opts->p_ssize *
+ num_channels(opts->p_chmask);
+ rate = opts->p_srate * uac2->p_framesize;
+ uac2->p_interval = (1 << (ep_desc->bInterval - 1)) * factor;
+ uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval,
+ prm->max_psize);
+
+ if (uac2->p_pktsize < prm->max_psize)
+ uac2->p_pktsize_residue = rate % uac2->p_interval;
+ else
+ uac2->p_pktsize_residue = 0;
+
+ req_len = uac2->p_pktsize;
+ uac2->p_residue = 0;
+ } else {
+ dev_err(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) {
+ req = usb_ep_alloc_request(ep, GFP_ATOMIC);
+ if (req == NULL)
+ return -ENOMEM;
+
+ prm->ureq[i].req = req;
+ prm->ureq[i].pp = prm;
+
+ req->zero = 0;
+ req->context = &prm->ureq[i];
+ req->length = req_len;
+ req->complete = agdev_iso_complete;
+ req->buf = prm->rbuf + i * prm->max_psize;
+ }
+
+ if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
+ dev_err(dev, "%s:%d Error!\n", __func__, __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;
+ struct f_uac2_opts *opts;
+ 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;
+ int p_srate, c_srate;
+
+ opts = agdev_to_uac2_opts(agdev);
+ p_srate = opts->p_srate;
+ c_srate = opts->c_srate;
+
+ 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;
+ struct f_uac2_opts *opts;
+ 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;
+ int p_srate, c_srate;
+
+ opts = agdev_to_uac2_opts(agdev);
+ p_srate = opts->p_srate;
+ c_srate = opts->c_srate;
+
+ 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 inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct f_uac2_opts,
+ func_inst.group);
+}
+
+CONFIGFS_ATTR_STRUCT(f_uac2_opts);
+CONFIGFS_ATTR_OPS(f_uac2_opts);
+
+static void f_uac2_attr_release(struct config_item *item)
+{
+ struct f_uac2_opts *opts = to_f_uac2_opts(item);
+
+ usb_put_function_instance(&opts->func_inst);
+}
+
+static struct configfs_item_operations f_uac2_item_ops = {
+ .release = f_uac2_attr_release,
+ .show_attribute = f_uac2_opts_attr_show,
+ .store_attribute = f_uac2_opts_attr_store,
+};
+
+#define UAC2_ATTRIBUTE(name) \
+static ssize_t f_uac2_opts_##name##_show(struct f_uac2_opts *opts, \
+ char *page) \
+{ \
+ int result; \
+ \
+ mutex_lock(&opts->lock); \
+ result = sprintf(page, "%u\n", opts->name); \
+ mutex_unlock(&opts->lock); \
+ \
+ return result; \
+} \
+ \
+static ssize_t f_uac2_opts_##name##_store(struct f_uac2_opts *opts, \
+ const char *page, size_t len) \
+{ \
+ 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; \
+} \
+ \
+static struct f_uac2_opts_attribute f_uac2_opts_##name = \
+ __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
+ f_uac2_opts_##name##_show, \
+ f_uac2_opts_##name##_store)
+
+UAC2_ATTRIBUTE(p_chmask);
+UAC2_ATTRIBUTE(p_srate);
+UAC2_ATTRIBUTE(p_ssize);
+UAC2_ATTRIBUTE(c_chmask);
+UAC2_ATTRIBUTE(c_srate);
+UAC2_ATTRIBUTE(c_ssize);
+
+static struct configfs_attribute *f_uac2_attrs[] = {
+ &f_uac2_opts_p_chmask.attr,
+ &f_uac2_opts_p_srate.attr,
+ &f_uac2_opts_p_ssize.attr,
+ &f_uac2_opts_c_chmask.attr,
+ &f_uac2_opts_c_srate.attr,
+ &f_uac2_opts_c_ssize.attr,
+ NULL,
+};
+
+static struct config_item_type f_uac2_func_type = {
+ .ct_item_ops = &f_uac2_item_ops,
+ .ct_attrs = f_uac2_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static void afunc_free_inst(struct usb_function_instance *f)
+{
+ struct f_uac2_opts *opts;
+
+ opts = container_of(f, struct f_uac2_opts, func_inst);
+ kfree(opts);
+}
+
+static struct usb_function_instance *afunc_alloc_inst(void)
+{
+ struct f_uac2_opts *opts;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_init(&opts->lock);
+ opts->func_inst.free_func_inst = afunc_free_inst;
+
+ config_group_init_type_name(&opts->func_inst.group, "",
+ &f_uac2_func_type);
+
+ opts->p_chmask = UAC2_DEF_PCHMASK;
+ opts->p_srate = UAC2_DEF_PSRATE;
+ opts->p_ssize = UAC2_DEF_PSSIZE;
+ opts->c_chmask = UAC2_DEF_CCHMASK;
+ opts->c_srate = UAC2_DEF_CSRATE;
+ opts->c_ssize = UAC2_DEF_CSSIZE;
+ return &opts->func_inst;
+}
+
+static void afunc_free(struct usb_function *f)
+{
+ struct audio_dev *agdev;
+ struct f_uac2_opts *opts;
+
+ agdev = func_to_agdev(f);
+ opts = container_of(f->fi, struct f_uac2_opts, func_inst);
+ kfree(agdev);
+ mutex_lock(&opts->lock);
+ --opts->refcnt;
+ mutex_unlock(&opts->lock);
+}
+
+static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct audio_dev *agdev = func_to_agdev(f);
+ 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(f);
+
+ if (agdev->in_ep)
+ agdev->in_ep->driver_data = NULL;
+ if (agdev->out_ep)
+ agdev->out_ep->driver_data = NULL;
+}
+
+static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
+{
+ struct audio_dev *agdev;
+ struct f_uac2_opts *opts;
+
+ agdev = kzalloc(sizeof(*agdev), GFP_KERNEL);
+ if (agdev == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ opts = container_of(fi, struct f_uac2_opts, func_inst);
+ mutex_lock(&opts->lock);
+ ++opts->refcnt;
+ mutex_unlock(&opts->lock);
+
+ agdev->func.name = "uac2_func";
+ agdev->func.bind = afunc_bind;
+ agdev->func.unbind = afunc_unbind;
+ agdev->func.set_alt = afunc_set_alt;
+ agdev->func.get_alt = afunc_get_alt;
+ agdev->func.disable = afunc_disable;
+ agdev->func.setup = afunc_setup;
+ agdev->func.free_func = afunc_free;
+
+ return &agdev->func;
+}
+
+DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yadwinder Singh");
+MODULE_AUTHOR("Jaswinder Singh");
Code Review / kvmfornfv.git / blobdiff