// SPDX-License-Identifier: GPL-2.0+ /* * f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API) * * Copyright (C) 2016 Ruslan Bilovol * * This driver doesn't expect any real Audio codec to be present * on the device - the audio streams are simply sinked to and * sourced from a virtual ALSA sound card created. * * This file is based on f_uac1.c which is * Copyright (C) 2008 Bryan Wu * Copyright (C) 2008 Analog Devices, Inc */ #include #include #include "u_audio.h" #include "u_uac1.h" /* UAC1 spec: 3.7.2.3 Audio Channel Cluster Format */ #define UAC1_CHANNEL_MASK 0x0FFF static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value); static int generic_get_cmd(struct usb_audio_control *con, u8 cmd); struct f_uac1 { struct g_audio g_audio; u8 ac_intf, as_in_intf, as_out_intf; u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */ /* Control Set command */ struct list_head cs; u8 set_cmd; struct usb_audio_control *set_con; }; static inline struct f_uac1 *func_to_uac1(struct usb_function *f) { return container_of(f, struct f_uac1, g_audio.func); } static inline struct f_uac1_opts *g_audio_to_uac1_opts(struct g_audio *audio) { return container_of(audio->func.fi, struct f_uac1_opts, func_inst); } /* * DESCRIPTORS ... most are static, but strings and full * configuration descriptors are built on demand. */ /* * We have three interfaces - one AudioControl and two AudioStreaming * * The driver implements a simple UAC_1 topology. * USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN */ #define F_AUDIO_AC_INTERFACE 0 #define F_AUDIO_AS_OUT_INTERFACE 1 #define F_AUDIO_AS_IN_INTERFACE 2 /* Number of streaming interfaces */ #define F_AUDIO_NUM_INTERFACES 2 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 = USB_SUBCLASS_AUDIOSTREAMING, .bFunctionProtocol = UAC_VERSION_1, }; /* B.3.1 Standard AC Interface Descriptor */ static struct usb_interface_descriptor ac_interface_desc = { .bLength = USB_DT_INTERFACE_SIZE, .bDescriptorType = USB_DT_INTERFACE, .bNumEndpoints = 0, .bInterfaceClass = USB_CLASS_AUDIO, .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, }; /* * The number of AudioStreaming and MIDIStreaming interfaces * in the Audio Interface Collection */ DECLARE_UAC_AC_HEADER_DESCRIPTOR(2); #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES) /* 2 input terminals and 2 output terminals */ #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \ + 2*UAC_DT_INPUT_TERMINAL_SIZE + 2*UAC_DT_OUTPUT_TERMINAL_SIZE \ + 2*UAC_DT_FEATURE_UNIT_SIZE(0) + UAC_DT_MIXER_UNIT_SIZE) /* B.3.2 Class-Specific AC Interface Descriptor */ static struct uac1_ac_header_descriptor_2 ac_header_desc = { .bLength = UAC_DT_AC_HEADER_LENGTH, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_HEADER, .bcdADC = cpu_to_le16(0x0100), .wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH), .bInCollection = F_AUDIO_NUM_INTERFACES, }; #define USB_OUT_IT_ID 1 static struct uac_input_terminal_descriptor usb_out_it_desc = { .bLength = UAC_DT_INPUT_TERMINAL_SIZE, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_INPUT_TERMINAL, .bTerminalID = USB_OUT_IT_ID, .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), .bAssocTerminal = 0, .wChannelConfig = cpu_to_le16(0x3), }; #define FEATURE_UNIT_ID 5 #define IO_OUT_OT_ID 2 static struct uac1_output_terminal_descriptor io_out_ot_desc = { .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, .bTerminalID = IO_OUT_OT_ID, .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER), .bAssocTerminal = 0, .bSourceID = FEATURE_UNIT_ID, }; #define IO_IN_IT_ID 3 static struct uac_input_terminal_descriptor io_in_it_desc = { .bLength = UAC_DT_INPUT_TERMINAL_SIZE, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_INPUT_TERMINAL, .bTerminalID = IO_IN_IT_ID, .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE), .bAssocTerminal = 0, .wChannelConfig = cpu_to_le16(0x3), }; #define MIC_FEATURE_UNIT_ID 6 #define USB_IN_OT_ID 4 static struct uac1_output_terminal_descriptor usb_in_ot_desc = { .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, .bTerminalID = USB_IN_OT_ID, .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), .bAssocTerminal = 0, .bSourceID = MIC_FEATURE_UNIT_ID, }; DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0); #define MIXER_UNIT_ID 9 static struct uac_feature_unit_descriptor_0 feature_unit_desc = { .bLength = UAC_DT_FEATURE_UNIT_SIZE(0), .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_FEATURE_UNIT, .bUnitID = FEATURE_UNIT_ID, .bSourceID = MIXER_UNIT_ID, .bControlSize = 0x2, .bmaControls[0] = cpu_to_le16(UAC_FU_MUTE | UAC_FU_VOLUME), }; static struct uac1_mixer_unit_descriptor mixer_unit_desc = { .bLength = UAC_DT_MIXER_UNIT_SIZE, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_MIXER_UNIT, .bUnitID = MIXER_UNIT_ID, .bNrInPins = 2, .baSourceID[0] = USB_OUT_IT_ID, .baSourceID[1] = MIC_FEATURE_UNIT_ID, .bNrChannels = 1, .wChannelConfig = cpu_to_le16(0x1), }; static struct uac_feature_unit_descriptor_0 mic_feature_unit_desc = { .bLength = UAC_DT_FEATURE_UNIT_SIZE(0), .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_FEATURE_UNIT, .bUnitID = MIC_FEATURE_UNIT_ID, .bSourceID = IO_IN_IT_ID, .bControlSize = 0x2, .bmaControls[0] = cpu_to_le16(UAC_FU_MUTE | UAC_FU_VOLUME), }; static struct usb_audio_control mute_control = { .list = LIST_HEAD_INIT(mute_control.list), .name = "Speaker Mute Control", .type = UAC_FU_MUTE, /* Todo: add real Mute control code */ .set = generic_set_cmd, .get = generic_get_cmd, }; static struct usb_audio_control volume_control = { .list = LIST_HEAD_INIT(volume_control.list), .name = "Speaker Volume Control", .type = UAC_FU_VOLUME, /* Todo: add real Volume control code */ .set = generic_set_cmd, .get = generic_get_cmd, }; static struct usb_audio_control_selector feature_unit = { .list = LIST_HEAD_INIT(feature_unit.list), .id = FEATURE_UNIT_ID, .name = "Speaker Mute & Volume Control", .type = UAC_FEATURE_UNIT, .desc = (struct usb_descriptor_header *)&feature_unit_desc, }; static struct usb_audio_control mic_mute_control = { .list = LIST_HEAD_INIT(mic_mute_control.list), .name = "MIC Mute Control", .type = UAC_FU_MUTE, /* Todo: add real Mute control code */ .set = generic_set_cmd, .get = generic_get_cmd, }; static struct usb_audio_control mic_volume_control = { .list = LIST_HEAD_INIT(mic_volume_control.list), .name = "MIC Volume Control", .type = UAC_FU_VOLUME, /* Todo: add real Volume control code */ .set = generic_set_cmd, .get = generic_get_cmd, }; static struct usb_audio_control_selector mic_feature_unit = { .list = LIST_HEAD_INIT(feature_unit.list), .id = MIC_FEATURE_UNIT_ID, .name = "MIC Mute & Volume Control", .type = UAC_FEATURE_UNIT, .desc = (struct usb_descriptor_header *)&mic_feature_unit_desc, }; /* B.4.1 Standard AS Interface Descriptor */ static struct usb_interface_descriptor as_out_interface_alt_0_desc = { .bLength = USB_DT_INTERFACE_SIZE, .bDescriptorType = USB_DT_INTERFACE, .bAlternateSetting = 0, .bNumEndpoints = 0, .bInterfaceClass = USB_CLASS_AUDIO, .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, }; static struct usb_interface_descriptor as_out_interface_alt_1_desc = { .bLength = USB_DT_INTERFACE_SIZE, .bDescriptorType = USB_DT_INTERFACE, .bAlternateSetting = 1, .bNumEndpoints = 1, .bInterfaceClass = USB_CLASS_AUDIO, .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, }; static struct usb_interface_descriptor as_in_interface_alt_0_desc = { .bLength = USB_DT_INTERFACE_SIZE, .bDescriptorType = USB_DT_INTERFACE, .bAlternateSetting = 0, .bNumEndpoints = 0, .bInterfaceClass = USB_CLASS_AUDIO, .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, }; static struct usb_interface_descriptor as_in_interface_alt_1_desc = { .bLength = USB_DT_INTERFACE_SIZE, .bDescriptorType = USB_DT_INTERFACE, .bAlternateSetting = 1, .bNumEndpoints = 1, .bInterfaceClass = USB_CLASS_AUDIO, .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, }; /* B.4.2 Class-Specific AS Interface Descriptor */ static struct uac1_as_header_descriptor as_out_header_desc = { .bLength = UAC_DT_AS_HEADER_SIZE, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_AS_GENERAL, .bTerminalLink = USB_OUT_IT_ID, .bDelay = 1, .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM), }; static struct uac1_as_header_descriptor as_in_header_desc = { .bLength = UAC_DT_AS_HEADER_SIZE, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_AS_GENERAL, .bTerminalLink = USB_IN_OT_ID, .bDelay = 1, .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM), }; DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1); static struct uac_format_type_i_discrete_descriptor_1 as_out_type_i_desc = { .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1), .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_FORMAT_TYPE, .bFormatType = UAC_FORMAT_TYPE_I, .bSubframeSize = 2, .bBitResolution = 16, .bSamFreqType = 1, }; /* Standard ISO OUT Endpoint Descriptor */ static struct usb_endpoint_descriptor as_out_ep_desc = { .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_OUT, .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE | USB_ENDPOINT_XFER_ISOC, .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE), .bInterval = 4, }; static struct usb_ss_ep_comp_descriptor as_out_ep_comp_desc = { .bLength = sizeof(as_out_ep_comp_desc), .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, .wBytesPerInterval = cpu_to_le16(1024), }; /* Class-specific AS ISO OUT Endpoint Descriptor */ static struct uac_iso_endpoint_descriptor as_iso_out_desc = { .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, .bDescriptorType = USB_DT_CS_ENDPOINT, .bDescriptorSubtype = UAC_EP_GENERAL, .bmAttributes = 1, .bLockDelayUnits = 1, .wLockDelay = cpu_to_le16(1), }; static struct uac_format_type_i_discrete_descriptor_1 as_in_type_i_desc = { .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1), .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubtype = UAC_FORMAT_TYPE, .bFormatType = UAC_FORMAT_TYPE_I, .bSubframeSize = 2, .bBitResolution = 16, .bSamFreqType = 1, }; /* Standard ISO OUT Endpoint Descriptor */ static struct usb_endpoint_descriptor as_in_ep_desc = { .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_SYNC_ASYNC | USB_ENDPOINT_XFER_ISOC, .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE), .bInterval = 4, }; static struct usb_ss_ep_comp_descriptor as_in_ep_comp_desc = { .bLength = sizeof(as_in_ep_comp_desc), .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, .wBytesPerInterval = cpu_to_le16(1024), }; /* Class-specific AS ISO OUT Endpoint Descriptor */ static struct uac_iso_endpoint_descriptor as_iso_in_desc = { .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, .bDescriptorType = USB_DT_CS_ENDPOINT, .bDescriptorSubtype = UAC_EP_GENERAL, .bmAttributes = 1, .bLockDelayUnits = 0, .wLockDelay = 0, }; static struct usb_descriptor_header *f_audio_desc[] = { (struct usb_descriptor_header *)&iad_desc, (struct usb_descriptor_header *)&ac_interface_desc, (struct usb_descriptor_header *)&ac_header_desc, (struct usb_descriptor_header *)&usb_out_it_desc, (struct usb_descriptor_header *)&io_out_ot_desc, (struct usb_descriptor_header *)&io_in_it_desc, (struct usb_descriptor_header *)&usb_in_ot_desc, (struct usb_descriptor_header *)&feature_unit_desc, (struct usb_descriptor_header *)&mic_feature_unit_desc, (struct usb_descriptor_header *)&mixer_unit_desc, (struct usb_descriptor_header *)&as_out_interface_alt_0_desc, (struct usb_descriptor_header *)&as_out_interface_alt_1_desc, (struct usb_descriptor_header *)&as_out_header_desc, (struct usb_descriptor_header *)&as_out_type_i_desc, (struct usb_descriptor_header *)&as_out_ep_desc, (struct usb_descriptor_header *)&as_iso_out_desc, (struct usb_descriptor_header *)&as_in_interface_alt_0_desc, (struct usb_descriptor_header *)&as_in_interface_alt_1_desc, (struct usb_descriptor_header *)&as_in_header_desc, (struct usb_descriptor_header *)&as_in_type_i_desc, (struct usb_descriptor_header *)&as_in_ep_desc, (struct usb_descriptor_header *)&as_iso_in_desc, NULL, }; static struct usb_descriptor_header *f_audio_ss_desc[] = { (struct usb_descriptor_header *)&iad_desc, (struct usb_descriptor_header *)&ac_interface_desc, (struct usb_descriptor_header *)&ac_header_desc, (struct usb_descriptor_header *)&usb_out_it_desc, (struct usb_descriptor_header *)&io_out_ot_desc, (struct usb_descriptor_header *)&io_in_it_desc, (struct usb_descriptor_header *)&usb_in_ot_desc, (struct usb_descriptor_header *)&feature_unit_desc, (struct usb_descriptor_header *)&mic_feature_unit_desc, (struct usb_descriptor_header *)&mixer_unit_desc, (struct usb_descriptor_header *)&as_out_interface_alt_0_desc, (struct usb_descriptor_header *)&as_out_interface_alt_1_desc, (struct usb_descriptor_header *)&as_out_header_desc, (struct usb_descriptor_header *)&as_out_type_i_desc, (struct usb_descriptor_header *)&as_out_ep_desc, (struct usb_descriptor_header *)&as_out_ep_comp_desc, (struct usb_descriptor_header *)&as_iso_out_desc, (struct usb_descriptor_header *)&as_in_interface_alt_0_desc, (struct usb_descriptor_header *)&as_in_interface_alt_1_desc, (struct usb_descriptor_header *)&as_in_header_desc, (struct usb_descriptor_header *)&as_in_type_i_desc, (struct usb_descriptor_header *)&as_in_ep_desc, (struct usb_descriptor_header *)&as_in_ep_comp_desc, (struct usb_descriptor_header *)&as_iso_in_desc, NULL, }; enum { STR_AC_IF, STR_USB_OUT_IT, STR_USB_OUT_IT_CH_NAMES, STR_IO_OUT_OT, STR_IO_IN_IT, STR_IO_IN_IT_CH_NAMES, STR_USB_IN_OT, STR_FEAT_DESC_0, STR_FEAT_DESC_1, STR_AS_OUT_IF_ALT0, STR_AS_OUT_IF_ALT1, STR_AS_IN_IF_ALT0, STR_AS_IN_IF_ALT1, }; static struct usb_string strings_uac1[] = { [STR_AC_IF].s = "AC Interface", [STR_USB_OUT_IT].s = "Playback Input terminal", [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels", [STR_IO_OUT_OT].s = "Playback Output terminal", [STR_IO_IN_IT].s = "Capture Input terminal", [STR_IO_IN_IT_CH_NAMES].s = "Capture Channels", [STR_USB_IN_OT].s = "Capture Output terminal", [STR_FEAT_DESC_0].s = "Volume control & mute", [STR_FEAT_DESC_1].s = "Mic Volume control & mute", [STR_AS_OUT_IF_ALT0].s = "Playback Inactive", [STR_AS_OUT_IF_ALT1].s = "Playback Active", [STR_AS_IN_IF_ALT0].s = "Capture Inactive", [STR_AS_IN_IF_ALT1].s = "Capture Active", { }, }; static struct usb_gadget_strings str_uac1 = { .language = 0x0409, /* en-us */ .strings = strings_uac1, }; static struct usb_gadget_strings *uac1_strings[] = { &str_uac1, NULL, }; static void f_audio_complete(struct usb_ep *ep, struct usb_request *req) { struct f_uac1 *uac1 = req->context; int status = req->status; u32 data = 0; switch (status) { case 0: /* normal completion? */ if (uac1->set_con) { memcpy(&data, req->buf, req->length); uac1->set_con->set(uac1->set_con, uac1->set_cmd, data); uac1->set_con = NULL; } break; default: break; } } static int audio_set_intf_req(struct usb_function *f, const struct usb_ctrlrequest *ctrl) { struct f_uac1 *uac1 = func_to_uac1(f); struct usb_composite_dev *cdev = f->config->cdev; struct usb_request *req = cdev->req; u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); u16 len = le16_to_cpu(ctrl->wLength); u16 w_value = le16_to_cpu(ctrl->wValue); u8 con_sel = (w_value >> 8) & 0xFF; u8 cmd = (ctrl->bRequest & 0x0F); struct usb_audio_control_selector *cs; struct usb_audio_control *con; DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", ctrl->bRequest, w_value, len, id); list_for_each_entry(cs, &uac1->cs, list) { if (cs->id == id) { list_for_each_entry(con, &cs->control, list) { if (con->type == con_sel) { uac1->set_con = con; break; } } break; } } uac1->set_cmd = cmd; req->context = uac1; req->complete = f_audio_complete; return len; } static int audio_get_intf_req(struct usb_function *f, const struct usb_ctrlrequest *ctrl) { struct f_uac1 *uac1 = func_to_uac1(f); struct usb_composite_dev *cdev = f->config->cdev; struct usb_request *req = cdev->req; int value = -EOPNOTSUPP; u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); u16 len = le16_to_cpu(ctrl->wLength); u16 w_value = le16_to_cpu(ctrl->wValue); u8 con_sel = (w_value >> 8) & 0xFF; u8 cmd = (ctrl->bRequest & 0x0F); struct usb_audio_control_selector *cs; struct usb_audio_control *con; DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", ctrl->bRequest, w_value, len, id); list_for_each_entry(cs, &uac1->cs, list) { if (cs->id == id) { list_for_each_entry(con, &cs->control, list) { if (con->type == con_sel && con->get) { value = con->get(con, cmd); break; } } break; } } req->context = uac1; req->complete = f_audio_complete; len = min_t(size_t, sizeof(value), len); memcpy(req->buf, &value, len); return len; } /* * This function is an ALSA sound card following USB Audio Class Spec 1.0. */ static int audio_set_endpoint_req(struct usb_function *f, const struct usb_ctrlrequest *ctrl) { struct usb_composite_dev *cdev = f->config->cdev; int value = -EOPNOTSUPP; u16 ep = le16_to_cpu(ctrl->wIndex); u16 len = le16_to_cpu(ctrl->wLength); u16 w_value = le16_to_cpu(ctrl->wValue); DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", ctrl->bRequest, w_value, len, ep); switch (ctrl->bRequest) { case UAC_SET_CUR: value = len; break; case UAC_SET_MIN: break; case UAC_SET_MAX: break; case UAC_SET_RES: break; case UAC_SET_MEM: break; default: break; } return value; } static int audio_get_endpoint_req(struct usb_function *f, const struct usb_ctrlrequest *ctrl) { struct usb_composite_dev *cdev = f->config->cdev; int value = -EOPNOTSUPP; u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); u16 len = le16_to_cpu(ctrl->wLength); u16 w_value = le16_to_cpu(ctrl->wValue); DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", ctrl->bRequest, w_value, len, ep); switch (ctrl->bRequest) { case UAC_GET_CUR: case UAC_GET_MIN: case UAC_GET_MAX: case UAC_GET_RES: value = len; break; case UAC_GET_MEM: break; default: break; } return value; } static int f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) { struct usb_composite_dev *cdev = f->config->cdev; struct usb_request *req = cdev->req; int value = -EOPNOTSUPP; u16 w_index = le16_to_cpu(ctrl->wIndex); u16 w_value = le16_to_cpu(ctrl->wValue); u16 w_length = le16_to_cpu(ctrl->wLength); /* composite driver infrastructure handles everything; interface * activation uses set_alt(). */ switch (ctrl->bRequestType) { case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE: value = audio_set_intf_req(f, ctrl); break; case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE: value = audio_get_intf_req(f, ctrl); break; case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: value = audio_set_endpoint_req(f, ctrl); break; case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: value = audio_get_endpoint_req(f, ctrl); break; default: ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", ctrl->bRequestType, ctrl->bRequest, w_value, w_index, w_length); } /* respond with data transfer or status phase? */ if (value >= 0) { DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n", ctrl->bRequestType, ctrl->bRequest, w_value, w_index, w_length); req->zero = 0; req->length = value; value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); if (value < 0) ERROR(cdev, "audio response on err %d\n", value); } /* device either stalls (value < 0) or reports success */ return value; } static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) { struct usb_composite_dev *cdev = f->config->cdev; struct usb_gadget *gadget = cdev->gadget; struct device *dev = &gadget->dev; struct f_uac1 *uac1 = func_to_uac1(f); int ret = 0; /* No i/f has more than 2 alt settings */ if (alt > 1) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return -EINVAL; } if (intf == uac1->ac_intf) { /* Control I/f has only 1 AltSetting - 0 */ if (alt) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return -EINVAL; } return 0; } if (intf == uac1->as_out_intf) { uac1->as_out_alt = alt; if (alt) ret = u_audio_start_capture(&uac1->g_audio); else u_audio_stop_capture(&uac1->g_audio); } else if (intf == uac1->as_in_intf) { uac1->as_in_alt = alt; if (alt) ret = u_audio_start_playback(&uac1->g_audio); else u_audio_stop_playback(&uac1->g_audio); } else { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return -EINVAL; } return ret; } static int f_audio_get_alt(struct usb_function *f, unsigned intf) { struct usb_composite_dev *cdev = f->config->cdev; struct usb_gadget *gadget = cdev->gadget; struct device *dev = &gadget->dev; struct f_uac1 *uac1 = func_to_uac1(f); if (intf == uac1->ac_intf) return uac1->ac_alt; else if (intf == uac1->as_out_intf) return uac1->as_out_alt; else if (intf == uac1->as_in_intf) return uac1->as_in_alt; else dev_err(dev, "%s:%d Invalid Interface %d!\n", __func__, __LINE__, intf); return -EINVAL; } static void f_audio_disable(struct usb_function *f) { struct f_uac1 *uac1 = func_to_uac1(f); uac1->as_out_alt = 0; uac1->as_in_alt = 0; u_audio_stop_playback(&uac1->g_audio); u_audio_stop_capture(&uac1->g_audio); } /*-------------------------------------------------------------------------*/ static int f_audio_validate_opts(struct g_audio *audio, struct device *dev) { struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); if (!opts->p_chmask && !opts->c_chmask) { dev_err(dev, "Error: no playback and capture channels\n"); return -EINVAL; } else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) { dev_err(dev, "Error: unsupported playback channels mask\n"); return -EINVAL; } else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) { dev_err(dev, "Error: unsupported capture channels mask\n"); return -EINVAL; } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) { dev_err(dev, "Error: incorrect playback sample size\n"); return -EINVAL; } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) { dev_err(dev, "Error: incorrect capture sample size\n"); return -EINVAL; } else if (!opts->p_srate) { dev_err(dev, "Error: incorrect playback sampling rate\n"); return -EINVAL; } else if (!opts->c_srate) { dev_err(dev, "Error: incorrect capture sampling rate\n"); return -EINVAL; } return 0; } /* audio function driver setup/binding */ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f) { struct usb_composite_dev *cdev = c->cdev; struct usb_gadget *gadget = cdev->gadget; struct device *dev = &gadget->dev; struct f_uac1 *uac1 = func_to_uac1(f); struct g_audio *audio = func_to_g_audio(f); struct f_uac1_opts *audio_opts; struct usb_ep *ep = NULL; struct usb_string *us; u8 *sam_freq; int rate; int status; status = f_audio_validate_opts(audio, dev); if (status) return status; audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst); us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1)); if (IS_ERR(us)) return PTR_ERR(us); ac_interface_desc.iInterface = us[STR_AC_IF].id; usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id; usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id; io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id; as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id; as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id; io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id; io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id; usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id; feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id; mic_feature_unit_desc.iFeature = us[STR_FEAT_DESC_1].id; as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id; as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id; /* Set channel numbers */ usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask); usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask); as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask); as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize; as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8; io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask); io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask); as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask); as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize; as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8; /* Set sample rates */ rate = audio_opts->c_srate; sam_freq = as_out_type_i_desc.tSamFreq[0]; memcpy(sam_freq, &rate, 3); rate = audio_opts->p_srate; sam_freq = as_in_type_i_desc.tSamFreq[0]; memcpy(sam_freq, &rate, 3); /* allocate instance-specific interface IDs, and patch descriptors */ status = usb_interface_id(c, f); if (status < 0) goto fail; ac_interface_desc.bInterfaceNumber = status; iad_desc.bFirstInterface = status; uac1->ac_intf = status; uac1->ac_alt = 0; status = usb_interface_id(c, f); if (status < 0) goto fail; ac_header_desc.baInterfaceNr[0] = status; as_out_interface_alt_0_desc.bInterfaceNumber = status; as_out_interface_alt_1_desc.bInterfaceNumber = status; uac1->as_out_intf = status; uac1->as_out_alt = 0; status = usb_interface_id(c, f); if (status < 0) goto fail; ac_header_desc.baInterfaceNr[1] = status; as_in_interface_alt_0_desc.bInterfaceNumber = status; as_in_interface_alt_1_desc.bInterfaceNumber = status; uac1->as_in_intf = status; uac1->as_in_alt = 0; audio->gadget = gadget; status = -ENODEV; audio_opts->ep_maxp_size = clamp(audio_opts->ep_maxp_size, 1U, 1023U); as_out_ep_desc.wMaxPacketSize = cpu_to_le16(audio_opts->ep_maxp_size); as_in_ep_desc.wMaxPacketSize = cpu_to_le16(audio_opts->ep_maxp_size); /* allocate instance-specific endpoints */ ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); if (!ep) goto fail; audio->out_ep = ep; audio->out_ep->desc = &as_out_ep_desc; ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc); if (!ep) goto fail; audio->in_ep = ep; audio->in_ep->desc = &as_in_ep_desc; /* copy descriptors, and track endpoint copies */ status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, f_audio_ss_desc, NULL); if (status) goto fail; audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize); audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize); audio->params.c_chmask = audio_opts->c_chmask; audio->params.c_srate = audio_opts->c_srate; audio->params.c_ssize = audio_opts->c_ssize; audio->params.p_chmask = audio_opts->p_chmask; audio->params.p_srate = audio_opts->p_srate; audio->params.p_ssize = audio_opts->p_ssize; audio->params.req_number = audio_opts->req_number; status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget"); if (status) goto err_card_register; return 0; err_card_register: usb_free_all_descriptors(f); fail: return status; } /*-------------------------------------------------------------------------*/ static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) { con->data[cmd] = value; pr_debug("%s:%s:value=%d\n", __func__, con->name, value); return 0; } static int generic_get_cmd(struct usb_audio_control *con, u8 cmd) { return con->data[cmd]; } /* Todo: add more control selecotor dynamically */ static int control_selector_init(struct f_uac1 *uac1) { INIT_LIST_HEAD(&uac1->cs); list_add(&feature_unit.list, &uac1->cs); list_add(&mic_feature_unit.list, &uac1->cs); INIT_LIST_HEAD(&feature_unit.control); list_add(&mute_control.list, &feature_unit.control); list_add(&volume_control.list, &feature_unit.control); INIT_LIST_HEAD(&mic_feature_unit.control); list_add(&mic_mute_control.list, &mic_feature_unit.control); list_add(&mic_volume_control.list, &mic_feature_unit.control); volume_control.data[UAC__CUR] = 0xffc0; volume_control.data[UAC__MIN] = 0xe3a0; volume_control.data[UAC__MAX] = 0xfff0; volume_control.data[UAC__RES] = 0x0030; mic_volume_control.data[UAC__CUR] = 0xffc0; mic_volume_control.data[UAC__MIN] = 0xe3a0; mic_volume_control.data[UAC__MAX] = 0xfff0; mic_volume_control.data[UAC__RES] = 0x0030; return 0; } static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item) { return container_of(to_config_group(item), struct f_uac1_opts, func_inst.group); } static void f_uac1_attr_release(struct config_item *item) { struct f_uac1_opts *opts = to_f_uac1_opts(item); usb_put_function_instance(&opts->func_inst); } static struct configfs_item_operations f_uac1_item_ops = { .release = f_uac1_attr_release, }; #define UAC1_ATTRIBUTE(name) \ static ssize_t f_uac1_opts_##name##_show( \ struct config_item *item, \ char *page) \ { \ struct f_uac1_opts *opts = to_f_uac1_opts(item); \ int result; \ \ mutex_lock(&opts->lock); \ result = sprintf(page, "%u\n", opts->name); \ mutex_unlock(&opts->lock); \ \ return result; \ } \ \ static ssize_t f_uac1_opts_##name##_store( \ struct config_item *item, \ const char *page, size_t len) \ { \ struct f_uac1_opts *opts = to_f_uac1_opts(item); \ int ret; \ u32 num; \ \ mutex_lock(&opts->lock); \ if (opts->refcnt) { \ ret = -EBUSY; \ goto end; \ } \ \ ret = kstrtou32(page, 0, &num); \ if (ret) \ goto end; \ \ opts->name = num; \ ret = len; \ \ end: \ mutex_unlock(&opts->lock); \ return ret; \ } \ \ CONFIGFS_ATTR(f_uac1_opts_, name) UAC1_ATTRIBUTE(c_chmask); UAC1_ATTRIBUTE(c_srate); UAC1_ATTRIBUTE(c_ssize); UAC1_ATTRIBUTE(p_chmask); UAC1_ATTRIBUTE(p_srate); UAC1_ATTRIBUTE(p_ssize); UAC1_ATTRIBUTE(req_number); UAC1_ATTRIBUTE(ep_maxp_size); static ssize_t f_uac1_opts_speaker_volume_show(struct config_item *item, char *page) { struct f_uac1_opts *opts = to_f_uac1_opts(item); struct f_uac1 *uac1 = opts->uac1; int result; struct usb_audio_control_selector *cs; struct usb_audio_control *con; int value; if (!uac1) return 0; list_for_each_entry(cs, &uac1->cs, list) { if (cs->id == FEATURE_UNIT_ID) { list_for_each_entry(con, &cs->control, list) { if (con->type == UAC_FU_VOLUME && con->get) { value = con->get(con, UAC__CUR); break; } } break; } } result = scnprintf(page, PAGE_SIZE, "%u\n", value); return result; } static ssize_t f_uac1_opts_mic_volume_show(struct config_item *item, char *page) { struct f_uac1_opts *opts = to_f_uac1_opts(item); struct f_uac1 *uac1 = opts->uac1; int result; struct usb_audio_control_selector *cs; struct usb_audio_control *con; int value; if (!uac1) return 0; list_for_each_entry(cs, &uac1->cs, list) { if (cs->id == MIC_FEATURE_UNIT_ID) { list_for_each_entry(con, &cs->control, list) { if (con->type == UAC_FU_VOLUME && con->get) { value = con->get(con, UAC__CUR); break; } } break; } } result = scnprintf(page, PAGE_SIZE, "%u\n", value); return result; } static ssize_t f_uac1_opts_speaker_mute_show(struct config_item *item, char *page) { struct f_uac1_opts *opts = to_f_uac1_opts(item); struct f_uac1 *uac1 = opts->uac1; int result; struct usb_audio_control_selector *cs; struct usb_audio_control *con; int value; if (!uac1) return 0; list_for_each_entry(cs, &uac1->cs, list) { if (cs->id == FEATURE_UNIT_ID) { list_for_each_entry(con, &cs->control, list) { if (con->type == UAC_FU_MUTE && con->get) { value = con->get(con, UAC__CUR); break; } } break; } } result = scnprintf(page, PAGE_SIZE, "%u\n", value); return result; } static ssize_t f_uac1_opts_mic_mute_show(struct config_item *item, char *page) { struct f_uac1_opts *opts = to_f_uac1_opts(item); struct f_uac1 *uac1 = opts->uac1; int result; struct usb_audio_control_selector *cs; struct usb_audio_control *con; int value; if (!uac1) return 0; list_for_each_entry(cs, &uac1->cs, list) { if (cs->id == MIC_FEATURE_UNIT_ID) { list_for_each_entry(con, &cs->control, list) { if (con->type == UAC_FU_MUTE && con->get) { value = con->get(con, UAC__CUR); break; } } break; } } result = scnprintf(page, PAGE_SIZE, "%u\n", value); return result; } CONFIGFS_ATTR_RO(f_uac1_opts_, speaker_volume); CONFIGFS_ATTR_RO(f_uac1_opts_, mic_volume); CONFIGFS_ATTR_RO(f_uac1_opts_, speaker_mute); CONFIGFS_ATTR_RO(f_uac1_opts_, mic_mute); static struct configfs_attribute *f_uac1_attrs[] = { &f_uac1_opts_attr_c_chmask, &f_uac1_opts_attr_c_srate, &f_uac1_opts_attr_c_ssize, &f_uac1_opts_attr_p_chmask, &f_uac1_opts_attr_p_srate, &f_uac1_opts_attr_p_ssize, &f_uac1_opts_attr_req_number, &f_uac1_opts_attr_speaker_volume, &f_uac1_opts_attr_mic_volume, &f_uac1_opts_attr_speaker_mute, &f_uac1_opts_attr_mic_mute, &f_uac1_opts_attr_ep_maxp_size, NULL, }; static const struct config_item_type f_uac1_func_type = { .ct_item_ops = &f_uac1_item_ops, .ct_attrs = f_uac1_attrs, .ct_owner = THIS_MODULE, }; static void f_audio_free_inst(struct usb_function_instance *f) { struct f_uac1_opts *opts; opts = container_of(f, struct f_uac1_opts, func_inst); kfree(opts); } static struct usb_function_instance *f_audio_alloc_inst(void) { struct f_uac1_opts *opts; opts = kzalloc(sizeof(*opts), GFP_KERNEL); if (!opts) return ERR_PTR(-ENOMEM); mutex_init(&opts->lock); opts->func_inst.free_func_inst = f_audio_free_inst; config_group_init_type_name(&opts->func_inst.group, "", &f_uac1_func_type); opts->c_chmask = UAC1_DEF_CCHMASK; opts->c_srate = UAC1_DEF_CSRATE; opts->c_ssize = UAC1_DEF_CSSIZE; opts->p_chmask = UAC1_DEF_PCHMASK; opts->p_srate = UAC1_DEF_PSRATE; opts->p_ssize = UAC1_DEF_PSSIZE; opts->req_number = UAC1_DEF_REQ_NUM; opts->ep_maxp_size = UAC1_OUT_EP_MAX_PACKET_SIZE; return &opts->func_inst; } static void f_audio_free(struct usb_function *f) { struct g_audio *audio; struct f_uac1_opts *opts; audio = func_to_g_audio(f); opts = container_of(f->fi, struct f_uac1_opts, func_inst); kfree(audio); mutex_lock(&opts->lock); --opts->refcnt; mutex_unlock(&opts->lock); } static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f) { struct g_audio *audio = func_to_g_audio(f); g_audio_cleanup(audio); usb_free_all_descriptors(f); audio->gadget = NULL; } static struct usb_function *f_audio_alloc(struct usb_function_instance *fi) { struct f_uac1 *uac1; struct f_uac1_opts *opts; /* allocate and initialize one new instance */ uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL); if (!uac1) return ERR_PTR(-ENOMEM); opts = container_of(fi, struct f_uac1_opts, func_inst); mutex_lock(&opts->lock); ++opts->refcnt; opts->uac1 = uac1; mutex_unlock(&opts->lock); uac1->g_audio.func.name = "uac1_func"; uac1->g_audio.func.bind = f_audio_bind; uac1->g_audio.func.unbind = f_audio_unbind; uac1->g_audio.func.set_alt = f_audio_set_alt; uac1->g_audio.func.get_alt = f_audio_get_alt; uac1->g_audio.func.setup = f_audio_setup; uac1->g_audio.func.disable = f_audio_disable; uac1->g_audio.func.free_func = f_audio_free; control_selector_init(uac1); return &uac1->g_audio.func; } DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Ruslan Bilovol");