// SPDX-License-Identifier: GPL-2.0+ /* * f_uac2.c -- USB Audio Class 2.0 Function * * Copyright (C) 2011 * Yadwinder Singh (yadi.brar01@gmail.com) * Jaswinder Singh (jaswinder.singh@linaro.org) */ #include #include #include #include "u_audio.h" #include "u_uac2.h" /* * 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 struct f_uac2 { struct g_audio g_audio; u8 ac_intf, as_in_intf, as_out_intf; u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */ }; static inline struct f_uac2 *func_to_uac2(struct usb_function *f) { return container_of(f, struct f_uac2, g_audio.func); } static inline struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev) { return container_of(agdev->func.fi, struct f_uac2_opts, func_inst); } /* --------- 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 = cpu_to_le16(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 = cpu_to_le16(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 = cpu_to_le16(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 = cpu_to_le16(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 = cpu_to_le16(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 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 f_uac2 *uac2 = func_to_uac2(fn); struct g_audio *agdev = func_to_g_audio(fn); struct usb_composite_dev *cdev = cfg->cdev; struct usb_gadget *gadget = cdev->gadget; struct device *dev = &gadget->dev; 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; uac2->ac_intf = ret; uac2->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; uac2->as_out_intf = ret; uac2->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; uac2->as_in_intf = ret; uac2->as_in_alt = 0; /* 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); agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc); if (!agdev->out_ep) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return -ENODEV; } agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc); if (!agdev->in_ep) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return -ENODEV; } agdev->in_ep_maxpsize = max_t(u16, le16_to_cpu(fs_epin_desc.wMaxPacketSize), le16_to_cpu(hs_epin_desc.wMaxPacketSize)); agdev->out_ep_maxpsize = max_t(u16, le16_to_cpu(fs_epout_desc.wMaxPacketSize), le16_to_cpu(hs_epout_desc.wMaxPacketSize)); 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; agdev->gadget = gadget; agdev->params.p_chmask = uac2_opts->p_chmask; agdev->params.p_srate = uac2_opts->p_srate; agdev->params.p_ssize = uac2_opts->p_ssize; agdev->params.c_chmask = uac2_opts->c_chmask; agdev->params.c_srate = uac2_opts->c_srate; agdev->params.c_ssize = uac2_opts->c_ssize; agdev->params.req_number = uac2_opts->req_number; ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget"); if (ret) goto err_free_descs; return 0; err_free_descs: usb_free_all_descriptors(fn); agdev->gadget = NULL; return ret; } static int afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) { struct usb_composite_dev *cdev = fn->config->cdev; struct f_uac2 *uac2 = func_to_uac2(fn); struct usb_gadget *gadget = cdev->gadget; struct device *dev = &gadget->dev; int ret = 0; /* No i/f has more than 2 alt settings */ if (alt > 1) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return -EINVAL; } if (intf == uac2->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 == uac2->as_out_intf) { uac2->as_out_alt = alt; if (alt) ret = u_audio_start_capture(&uac2->g_audio); else u_audio_stop_capture(&uac2->g_audio); } else if (intf == uac2->as_in_intf) { uac2->as_in_alt = alt; if (alt) ret = u_audio_start_playback(&uac2->g_audio); else u_audio_stop_playback(&uac2->g_audio); } else { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return -EINVAL; } return ret; } static int afunc_get_alt(struct usb_function *fn, unsigned intf) { struct f_uac2 *uac2 = func_to_uac2(fn); struct g_audio *agdev = func_to_g_audio(fn); if (intf == uac2->ac_intf) return uac2->ac_alt; else if (intf == uac2->as_out_intf) return uac2->as_out_alt; else if (intf == uac2->as_in_intf) return uac2->as_in_alt; else dev_err(&agdev->gadget->dev, "%s:%d Invalid Interface %d!\n", __func__, __LINE__, intf); return -EINVAL; } static void afunc_disable(struct usb_function *fn) { struct f_uac2 *uac2 = func_to_uac2(fn); uac2->as_in_alt = 0; uac2->as_out_alt = 0; u_audio_stop_capture(&uac2->g_audio); u_audio_stop_playback(&uac2->g_audio); } static int in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) { struct usb_request *req = fn->config->cdev->req; struct g_audio *agdev = func_to_g_audio(fn); 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 = g_audio_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(&agdev->gadget->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 g_audio *agdev = func_to_g_audio(fn); 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 = g_audio_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(&agdev->gadget->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 f_uac2 *uac2 = func_to_uac2(fn); struct g_audio *agdev = func_to_g_audio(fn); u16 w_index = le16_to_cpu(cr->wIndex); u8 intf = w_index & 0xff; if (intf != uac2->ac_intf) { dev_err(&agdev->gadget->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 g_audio *agdev = func_to_g_audio(fn); 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(&agdev->gadget->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(&agdev->gadget->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); UAC2_ATTRIBUTE(req_number); 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, &f_uac2_opts_attr_req_number, NULL, }; static const 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; opts->req_number = UAC2_DEF_REQ_NUM; return &opts->func_inst; } static void afunc_free(struct usb_function *f) { struct g_audio *agdev; struct f_uac2_opts *opts; agdev = func_to_g_audio(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 g_audio *agdev = func_to_g_audio(f); g_audio_cleanup(agdev); usb_free_all_descriptors(f); agdev->gadget = NULL; } static struct usb_function *afunc_alloc(struct usb_function_instance *fi) { struct f_uac2 *uac2; struct f_uac2_opts *opts; uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL); if (uac2 == 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); uac2->g_audio.func.name = "uac2_func"; uac2->g_audio.func.bind = afunc_bind; uac2->g_audio.func.unbind = afunc_unbind; uac2->g_audio.func.set_alt = afunc_set_alt; uac2->g_audio.func.get_alt = afunc_get_alt; uac2->g_audio.func.disable = afunc_disable; uac2->g_audio.func.setup = afunc_setup; uac2->g_audio.func.free_func = afunc_free; return &uac2->g_audio.func; } DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Yadwinder Singh"); MODULE_AUTHOR("Jaswinder Singh");