/* * 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 #include #include #include #include #include #include #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_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 { __le32 dCUR; }; struct cntrl_range_lay3 { __le16 wNumSubRanges; __le32 dMIN; __le32 dMAX; __le32 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 void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts, struct usb_endpoint_descriptor *ep_desc, unsigned int factor, bool is_playback) { int chmask, srate, ssize; u16 max_packet_size; if (is_playback) { chmask = uac2_opts->p_chmask; srate = uac2_opts->p_srate; ssize = uac2_opts->p_ssize; } else { chmask = uac2_opts->c_chmask; srate = uac2_opts->c_srate; ssize = uac2_opts->c_ssize; } max_packet_size = num_channels(chmask) * ssize * DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1))); ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_packet_size, le16_to_cpu(ep_desc->wMaxPacketSize))); } 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; } iad_desc.bFirstInterface = 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__); return ret; } agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc); if (!agdev->in_ep) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return ret; } uac2->p_prm.uac2 = uac2; uac2->c_prm.uac2 = uac2; /* Calculate wMaxPacketSize according to audio bandwidth */ set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true); set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false); set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true); set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false); hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress; hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress; ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL, NULL); if (ret) return ret; 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; } ret = alsa_uac2_init(agdev); if (ret) goto err; return 0; err: kfree(agdev->uac2.p_prm.rbuf); kfree(agdev->uac2.c_prm.rbuf); err_free_descs: usb_free_all_descriptors(fn); 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 = 8000; } /* 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 = factor / (1 << (ep_desc->bInterval - 1)); 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; memset(&c, 0, sizeof(struct cntrl_cur_lay3)); if (entity_id == USB_IN_CLK_ID) c.dCUR = cpu_to_le32(p_srate); else if (entity_id == USB_OUT_CLK_ID) c.dCUR = cpu_to_le32(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 = cpu_to_le32(p_srate); else if (entity_id == USB_OUT_CLK_ID) r.dMIN = cpu_to_le32(c_srate); else return -EOPNOTSUPP; r.dMAX = r.dMIN; r.dRES = 0; r.wNumSubRanges = cpu_to_le16(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); } 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, }; #define UAC2_ATTRIBUTE(name) \ static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \ char *page) \ { \ struct f_uac2_opts *opts = to_f_uac2_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_uac2_opts_##name##_store(struct config_item *item, \ const char *page, size_t len) \ { \ struct f_uac2_opts *opts = to_f_uac2_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_uac2_opts_, name) 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_attr_p_chmask, &f_uac2_opts_attr_p_srate, &f_uac2_opts_attr_p_ssize, &f_uac2_opts_attr_c_chmask, &f_uac2_opts_attr_c_srate, &f_uac2_opts_attr_c_ssize, 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); } 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");