diff options
Diffstat (limited to 'drivers/usb/gadget/function/f_uac1.c')
| -rw-r--r-- | drivers/usb/gadget/function/f_uac1.c | 1754 |
1 files changed, 1754 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/function/f_uac1.c new file mode 100644 index 000000000..6f0e1d803 --- /dev/null +++ b/drivers/usb/gadget/function/f_uac1.c @@ -0,0 +1,1754 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API) + * + * Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com> + * Copyright (C) 2021 Julian Scheel <julian@jusst.de> + * + * 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 <cooloney@kernel.org> + * Copyright (C) 2008 Analog Devices, Inc + */ + +#include <linux/usb/audio.h> +#include <linux/module.h> + +#include "u_audio.h" +#include "u_uac1.h" + +/* UAC1 spec: 3.7.2.3 Audio Channel Cluster Format */ +#define UAC1_CHANNEL_MASK 0x0FFF + +#define USB_OUT_FU_ID (out_feature_unit_desc->bUnitID) +#define USB_IN_FU_ID (in_feature_unit_desc->bUnitID) + +#define EPIN_EN(_opts) ((_opts)->p_chmask != 0) +#define EPOUT_EN(_opts) ((_opts)->c_chmask != 0) +#define FUIN_EN(_opts) ((_opts)->p_mute_present \ + || (_opts)->p_volume_present) +#define FUOUT_EN(_opts) ((_opts)->c_mute_present \ + || (_opts)->c_volume_present) + +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() */ + + struct usb_ctrlrequest setup_cr; /* will be used in data stage */ + + /* Interrupt IN endpoint of AC interface */ + struct usb_ep *int_ep; + atomic_t int_count; + int ctl_id; /* EP id */ + int c_srate; /* current capture srate */ + int p_srate; /* current playback prate */ +}; + +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 + */ + +/* 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 = DYNAMIC */ + .bInterfaceClass = USB_CLASS_AUDIO, + .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, +}; + +/* B.3.2 Class-Specific AC Interface Descriptor */ +static struct uac1_ac_header_descriptor *ac_header_desc; + +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 = DYNAMIC */ + .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), + .bAssocTerminal = 0, + .wChannelConfig = cpu_to_le16(0x3), +}; + +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 = DYNAMIC */ + .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER), + .bAssocTerminal = 0, + /* .bSourceID = DYNAMIC */ +}; + +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 = DYNAMIC */ + .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE), + .bAssocTerminal = 0, + .wChannelConfig = cpu_to_le16(0x3), +}; + +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 = DYNAMIC */ + .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), + .bAssocTerminal = 0, + /* .bSourceID = DYNAMIC */ +}; + +static struct uac_feature_unit_descriptor *in_feature_unit_desc; +static struct uac_feature_unit_descriptor *out_feature_unit_desc; + +/* AC IN Interrupt Endpoint */ +static struct usb_endpoint_descriptor ac_int_ep_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_INT, + .wMaxPacketSize = cpu_to_le16(2), + .bInterval = 4, +}; + +/* 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 = DYNAMIC */ + .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 = DYNAMIC */ + .bDelay = 1, + .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM), +}; + +DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(UAC_MAX_RATES); +#define uac_format_type_i_discrete_descriptor \ + uac_format_type_i_discrete_descriptor_##UAC_MAX_RATES + +static struct uac_format_type_i_discrete_descriptor as_out_type_i_desc = { + .bLength = 0, /* filled on rate setup */ + .bDescriptorType = USB_DT_CS_INTERFACE, + .bDescriptorSubtype = UAC_FORMAT_TYPE, + .bFormatType = UAC_FORMAT_TYPE_I, + .bSubframeSize = 2, + .bBitResolution = 16, + .bSamFreqType = 0, /* filled on rate setup */ +}; + +/* 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, +}; + +/* 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 as_in_type_i_desc = { + .bLength = 0, /* filled on rate setup */ + .bDescriptorType = USB_DT_CS_INTERFACE, + .bDescriptorSubtype = UAC_FORMAT_TYPE, + .bFormatType = UAC_FORMAT_TYPE_I, + .bSubframeSize = 2, + .bBitResolution = 16, + .bSamFreqType = 0, /* filled on rate setup */ +}; + +/* 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, +}; + +/* 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 *)&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 *)&out_feature_unit_desc, + + (struct usb_descriptor_header *)&io_in_it_desc, + (struct usb_descriptor_header *)&usb_in_ot_desc, + (struct usb_descriptor_header *)&in_feature_unit_desc, + + (struct usb_descriptor_header *)&ac_int_ep_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, +}; + +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_FU_IN, + STR_FU_OUT, + 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 = DYNAMIC, */ + [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_FU_IN].s = "Capture Volume", + [STR_FU_OUT].s = "Playback Volume", + [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, +}; + +/* + * This function is an ALSA sound card following USB Audio Class Spec 1.0. + */ + +static void uac_cs_attr_sample_rate(struct usb_ep *ep, struct usb_request *req) +{ + struct usb_function *fn = ep->driver_data; + struct usb_composite_dev *cdev = fn->config->cdev; + struct g_audio *agdev = func_to_g_audio(fn); + struct f_uac1 *uac1 = func_to_uac1(fn); + u8 *buf = (u8 *)req->buf; + u32 val = 0; + + if (req->actual != 3) { + WARN(cdev, "Invalid data size for UAC_EP_CS_ATTR_SAMPLE_RATE.\n"); + return; + } + + val = buf[0] | (buf[1] << 8) | (buf[2] << 16); + if (uac1->ctl_id == (USB_DIR_IN | 2)) { + uac1->p_srate = val; + u_audio_set_playback_srate(agdev, uac1->p_srate); + } else if (uac1->ctl_id == (USB_DIR_OUT | 1)) { + uac1->c_srate = val; + u_audio_set_capture_srate(agdev, uac1->c_srate); + } +} + +static void audio_notify_complete(struct usb_ep *_ep, struct usb_request *req) +{ + struct g_audio *audio = req->context; + struct f_uac1 *uac1 = func_to_uac1(&audio->func); + + atomic_dec(&uac1->int_count); + kfree(req->buf); + usb_ep_free_request(_ep, req); +} + +static int audio_notify(struct g_audio *audio, int unit_id, int cs) +{ + struct f_uac1 *uac1 = func_to_uac1(&audio->func); + struct usb_request *req; + struct uac1_status_word *msg; + int ret; + + if (!uac1->int_ep->enabled) + return 0; + + if (atomic_inc_return(&uac1->int_count) > UAC1_DEF_INT_REQ_NUM) { + atomic_dec(&uac1->int_count); + return 0; + } + + req = usb_ep_alloc_request(uac1->int_ep, GFP_ATOMIC); + if (req == NULL) { + ret = -ENOMEM; + goto err_dec_int_count; + } + + msg = kmalloc(sizeof(*msg), GFP_ATOMIC); + if (msg == NULL) { + ret = -ENOMEM; + goto err_free_request; + } + + msg->bStatusType = UAC1_STATUS_TYPE_IRQ_PENDING + | UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF; + msg->bOriginator = unit_id; + + req->length = sizeof(*msg); + req->buf = msg; + req->context = audio; + req->complete = audio_notify_complete; + + ret = usb_ep_queue(uac1->int_ep, req, GFP_ATOMIC); + + if (ret) + goto err_free_msg; + + return 0; + +err_free_msg: + kfree(msg); +err_free_request: + usb_ep_free_request(uac1->int_ep, req); +err_dec_int_count: + atomic_dec(&uac1->int_count); + + return ret; +} + +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 *audio = func_to_g_audio(fn); + struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); + u16 w_length = le16_to_cpu(cr->wLength); + u16 w_index = le16_to_cpu(cr->wIndex); + u16 w_value = le16_to_cpu(cr->wValue); + u8 entity_id = (w_index >> 8) & 0xff; + u8 control_selector = w_value >> 8; + int value = -EOPNOTSUPP; + + if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || + (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { + unsigned int is_playback = 0; + + if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) + is_playback = 1; + + if (control_selector == UAC_FU_MUTE) { + unsigned int mute; + + u_audio_get_mute(audio, is_playback, &mute); + + *(u8 *)req->buf = mute; + value = min_t(unsigned int, w_length, 1); + } else if (control_selector == UAC_FU_VOLUME) { + __le16 c; + s16 volume; + + u_audio_get_volume(audio, is_playback, &volume); + + c = cpu_to_le16(volume); + + value = min_t(unsigned int, w_length, sizeof(c)); + memcpy(req->buf, &c, value); + } else { + dev_err(&audio->gadget->dev, + "%s:%d control_selector=%d TODO!\n", + __func__, __LINE__, control_selector); + } + } else { + dev_err(&audio->gadget->dev, + "%s:%d entity_id=%d control_selector=%d TODO!\n", + __func__, __LINE__, entity_id, control_selector); + } + + return value; +} + +static int +in_rq_min(struct usb_function *fn, const struct usb_ctrlrequest *cr) +{ + struct usb_request *req = fn->config->cdev->req; + struct g_audio *audio = func_to_g_audio(fn); + struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); + u16 w_length = le16_to_cpu(cr->wLength); + u16 w_index = le16_to_cpu(cr->wIndex); + u16 w_value = le16_to_cpu(cr->wValue); + u8 entity_id = (w_index >> 8) & 0xff; + u8 control_selector = w_value >> 8; + int value = -EOPNOTSUPP; + + if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || + (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { + unsigned int is_playback = 0; + + if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) + is_playback = 1; + + if (control_selector == UAC_FU_VOLUME) { + __le16 r; + s16 min_db; + + if (is_playback) + min_db = opts->p_volume_min; + else + min_db = opts->c_volume_min; + + r = cpu_to_le16(min_db); + + value = min_t(unsigned int, w_length, sizeof(r)); + memcpy(req->buf, &r, value); + } else { + dev_err(&audio->gadget->dev, + "%s:%d control_selector=%d TODO!\n", + __func__, __LINE__, control_selector); + } + } else { + dev_err(&audio->gadget->dev, + "%s:%d entity_id=%d control_selector=%d TODO!\n", + __func__, __LINE__, entity_id, control_selector); + } + + return value; +} + +static int +in_rq_max(struct usb_function *fn, const struct usb_ctrlrequest *cr) +{ + struct usb_request *req = fn->config->cdev->req; + struct g_audio *audio = func_to_g_audio(fn); + struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); + u16 w_length = le16_to_cpu(cr->wLength); + u16 w_index = le16_to_cpu(cr->wIndex); + u16 w_value = le16_to_cpu(cr->wValue); + u8 entity_id = (w_index >> 8) & 0xff; + u8 control_selector = w_value >> 8; + int value = -EOPNOTSUPP; + + if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || + (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { + unsigned int is_playback = 0; + + if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) + is_playback = 1; + + if (control_selector == UAC_FU_VOLUME) { + __le16 r; + s16 max_db; + + if (is_playback) + max_db = opts->p_volume_max; + else + max_db = opts->c_volume_max; + + r = cpu_to_le16(max_db); + + value = min_t(unsigned int, w_length, sizeof(r)); + memcpy(req->buf, &r, value); + } else { + dev_err(&audio->gadget->dev, + "%s:%d control_selector=%d TODO!\n", + __func__, __LINE__, control_selector); + } + } else { + dev_err(&audio->gadget->dev, + "%s:%d entity_id=%d control_selector=%d TODO!\n", + __func__, __LINE__, entity_id, control_selector); + } + + return value; +} + +static int +in_rq_res(struct usb_function *fn, const struct usb_ctrlrequest *cr) +{ + struct usb_request *req = fn->config->cdev->req; + struct g_audio *audio = func_to_g_audio(fn); + struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); + u16 w_length = le16_to_cpu(cr->wLength); + u16 w_index = le16_to_cpu(cr->wIndex); + u16 w_value = le16_to_cpu(cr->wValue); + u8 entity_id = (w_index >> 8) & 0xff; + u8 control_selector = w_value >> 8; + int value = -EOPNOTSUPP; + + if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || + (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { + unsigned int is_playback = 0; + + if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) + is_playback = 1; + + if (control_selector == UAC_FU_VOLUME) { + __le16 r; + s16 res_db; + + if (is_playback) + res_db = opts->p_volume_res; + else + res_db = opts->c_volume_res; + + r = cpu_to_le16(res_db); + + value = min_t(unsigned int, w_length, sizeof(r)); + memcpy(req->buf, &r, value); + } else { + dev_err(&audio->gadget->dev, + "%s:%d control_selector=%d TODO!\n", + __func__, __LINE__, control_selector); + } + } else { + dev_err(&audio->gadget->dev, + "%s:%d entity_id=%d control_selector=%d TODO!\n", + __func__, __LINE__, entity_id, control_selector); + } + + return value; +} + +static void +out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req) +{ + struct g_audio *audio = req->context; + struct usb_composite_dev *cdev = audio->func.config->cdev; + struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); + struct f_uac1 *uac1 = func_to_uac1(&audio->func); + struct usb_ctrlrequest *cr = &uac1->setup_cr; + 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; + + if (req->status != 0) { + dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status); + return; + } + + if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || + (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { + unsigned int is_playback = 0; + + if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) + is_playback = 1; + + if (control_selector == UAC_FU_MUTE) { + u8 mute = *(u8 *)req->buf; + + u_audio_set_mute(audio, is_playback, mute); + + return; + } else if (control_selector == UAC_FU_VOLUME) { + __le16 *c = req->buf; + s16 volume; + + volume = le16_to_cpu(*c); + u_audio_set_volume(audio, is_playback, volume); + + return; + } else { + dev_err(&audio->gadget->dev, + "%s:%d control_selector=%d TODO!\n", + __func__, __LINE__, control_selector); + usb_ep_set_halt(ep); + } + } else { + dev_err(&audio->gadget->dev, + "%s:%d entity_id=%d control_selector=%d TODO!\n", + __func__, __LINE__, entity_id, control_selector); + usb_ep_set_halt(ep); + + } +} + +static int +out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) +{ + struct usb_request *req = fn->config->cdev->req; + struct g_audio *audio = func_to_g_audio(fn); + struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); + struct f_uac1 *uac1 = func_to_uac1(&audio->func); + 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; + + if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || + (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { + memcpy(&uac1->setup_cr, cr, sizeof(*cr)); + req->context = audio; + req->complete = out_rq_cur_complete; + + return w_length; + } else { + dev_err(&audio->gadget->dev, + "%s:%d entity_id=%d control_selector=%d TODO!\n", + __func__, __LINE__, entity_id, control_selector); + } + return -EOPNOTSUPP; +} + +static int ac_rq_in(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: + return in_rq_cur(f, ctrl); + case UAC_GET_MIN: + return in_rq_min(f, ctrl); + case UAC_GET_MAX: + return in_rq_max(f, ctrl); + case UAC_GET_RES: + return in_rq_res(f, ctrl); + case UAC_GET_MEM: + break; + case UAC_GET_STAT: + value = len; + break; + default: + break; + } + + return value; +} + +static int audio_set_endpoint_req(struct usb_function *f, + const struct usb_ctrlrequest *ctrl) +{ + struct usb_composite_dev *cdev = f->config->cdev; + struct usb_request *req = f->config->cdev->req; + struct f_uac1 *uac1 = func_to_uac1(f); + 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); + u8 cs = w_value >> 8; + + 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: { + if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) { + cdev->gadget->ep0->driver_data = f; + uac1->ctl_id = ep; + req->complete = uac_cs_attr_sample_rate; + } + 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; + struct usb_request *req = f->config->cdev->req; + struct f_uac1 *uac1 = func_to_uac1(f); + u8 *buf = (u8 *)req->buf; + int value = -EOPNOTSUPP; + u8 ep = le16_to_cpu(ctrl->wIndex); + u16 len = le16_to_cpu(ctrl->wLength); + u16 w_value = le16_to_cpu(ctrl->wValue); + u8 cs = w_value >> 8; + u32 val = 0; + + 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: { + if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) { + if (ep == (USB_DIR_IN | 2)) + val = uac1->p_srate; + else if (ep == (USB_DIR_OUT | 1)) + val = uac1->c_srate; + buf[2] = (val >> 16) & 0xff; + buf[1] = (val >> 8) & 0xff; + buf[0] = val & 0xff; + } + value = len; + break; + } + 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_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; + case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE: + if (ctrl->bRequest == UAC_SET_CUR) + value = out_rq_cur(f, ctrl); + break; + case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE: + value = ac_rq_in(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 g_audio *audio = func_to_g_audio(f); + 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; + } + + /* restart interrupt endpoint */ + if (uac1->int_ep) { + usb_ep_disable(uac1->int_ep); + config_ep_by_speed(gadget, &audio->func, uac1->int_ep); + usb_ep_enable(uac1->int_ep); + } + + 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); + if (uac1->int_ep) + usb_ep_disable(uac1->int_ep); +} + +static void +f_audio_suspend(struct usb_function *f) +{ + struct f_uac1 *uac1 = func_to_uac1(f); + + u_audio_suspend(&uac1->g_audio); +} + +/*-------------------------------------------------------------------------*/ +static struct uac_feature_unit_descriptor *build_fu_desc(int chmask) +{ + struct uac_feature_unit_descriptor *fu_desc; + int channels = num_channels(chmask); + int fu_desc_size = UAC_DT_FEATURE_UNIT_SIZE(channels); + + fu_desc = kzalloc(fu_desc_size, GFP_KERNEL); + if (!fu_desc) + return NULL; + + fu_desc->bLength = fu_desc_size; + fu_desc->bDescriptorType = USB_DT_CS_INTERFACE; + + fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT; + fu_desc->bControlSize = 2; + + /* bUnitID, bSourceID and bmaControls will be defined later */ + + return fu_desc; +} + +/* B.3.2 Class-Specific AC Interface Descriptor */ +static struct +uac1_ac_header_descriptor *build_ac_header_desc(struct f_uac1_opts *opts) +{ + struct uac1_ac_header_descriptor *ac_desc; + int ac_header_desc_size; + int num_ifaces = 0; + + if (EPOUT_EN(opts)) + num_ifaces++; + if (EPIN_EN(opts)) + num_ifaces++; + + ac_header_desc_size = UAC_DT_AC_HEADER_SIZE(num_ifaces); + + ac_desc = kzalloc(ac_header_desc_size, GFP_KERNEL); + if (!ac_desc) + return NULL; + + ac_desc->bLength = ac_header_desc_size; + ac_desc->bDescriptorType = USB_DT_CS_INTERFACE; + ac_desc->bDescriptorSubtype = UAC_HEADER; + ac_desc->bcdADC = cpu_to_le16(0x0100); + ac_desc->bInCollection = num_ifaces; + + /* wTotalLength and baInterfaceNr will be defined later */ + + return ac_desc; +} + +/* Use macro to overcome line length limitation */ +#define USBDHDR(p) (struct usb_descriptor_header *)(p) + +static void setup_descriptor(struct f_uac1_opts *opts) +{ + /* patch descriptors */ + int i = 1; /* ID's start with 1 */ + + if (EPOUT_EN(opts)) + usb_out_it_desc.bTerminalID = i++; + if (EPIN_EN(opts)) + io_in_it_desc.bTerminalID = i++; + if (EPOUT_EN(opts)) + io_out_ot_desc.bTerminalID = i++; + if (EPIN_EN(opts)) + usb_in_ot_desc.bTerminalID = i++; + if (FUOUT_EN(opts)) + out_feature_unit_desc->bUnitID = i++; + if (FUIN_EN(opts)) + in_feature_unit_desc->bUnitID = i++; + + if (FUIN_EN(opts)) { + usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID; + in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID; + } else { + usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID; + } + if (FUOUT_EN(opts)) { + io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID; + out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID; + } else { + io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID; + } + + as_out_header_desc.bTerminalLink = usb_out_it_desc.bTerminalID; + as_in_header_desc.bTerminalLink = usb_in_ot_desc.bTerminalID; + + ac_header_desc->wTotalLength = cpu_to_le16(ac_header_desc->bLength); + + if (EPIN_EN(opts)) { + u16 len = le16_to_cpu(ac_header_desc->wTotalLength); + + len += sizeof(usb_in_ot_desc); + len += sizeof(io_in_it_desc); + if (FUIN_EN(opts)) + len += in_feature_unit_desc->bLength; + ac_header_desc->wTotalLength = cpu_to_le16(len); + } + if (EPOUT_EN(opts)) { + u16 len = le16_to_cpu(ac_header_desc->wTotalLength); + + len += sizeof(usb_out_it_desc); + len += sizeof(io_out_ot_desc); + if (FUOUT_EN(opts)) + len += out_feature_unit_desc->bLength; + ac_header_desc->wTotalLength = cpu_to_le16(len); + } + + i = 0; + f_audio_desc[i++] = USBDHDR(&ac_interface_desc); + f_audio_desc[i++] = USBDHDR(ac_header_desc); + + if (EPOUT_EN(opts)) { + f_audio_desc[i++] = USBDHDR(&usb_out_it_desc); + f_audio_desc[i++] = USBDHDR(&io_out_ot_desc); + if (FUOUT_EN(opts)) + f_audio_desc[i++] = USBDHDR(out_feature_unit_desc); + } + + if (EPIN_EN(opts)) { + f_audio_desc[i++] = USBDHDR(&io_in_it_desc); + f_audio_desc[i++] = USBDHDR(&usb_in_ot_desc); + if (FUIN_EN(opts)) + f_audio_desc[i++] = USBDHDR(in_feature_unit_desc); + } + + if (FUOUT_EN(opts) || FUIN_EN(opts)) + f_audio_desc[i++] = USBDHDR(&ac_int_ep_desc); + + if (EPOUT_EN(opts)) { + f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_0_desc); + f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_1_desc); + f_audio_desc[i++] = USBDHDR(&as_out_header_desc); + f_audio_desc[i++] = USBDHDR(&as_out_type_i_desc); + f_audio_desc[i++] = USBDHDR(&as_out_ep_desc); + f_audio_desc[i++] = USBDHDR(&as_iso_out_desc); + } + if (EPIN_EN(opts)) { + f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_0_desc); + f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_1_desc); + f_audio_desc[i++] = USBDHDR(&as_in_header_desc); + f_audio_desc[i++] = USBDHDR(&as_in_type_i_desc); + f_audio_desc[i++] = USBDHDR(&as_in_ep_desc); + f_audio_desc[i++] = USBDHDR(&as_iso_in_desc); + } + f_audio_desc[i] = NULL; +} + +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_srates[0]) { + dev_err(dev, "Error: incorrect playback sampling rate\n"); + return -EINVAL; + } else if (!opts->c_srates[0]) { + dev_err(dev, "Error: incorrect capture sampling rate\n"); + return -EINVAL; + } + + if (opts->p_volume_max <= opts->p_volume_min) { + dev_err(dev, "Error: incorrect playback volume max/min\n"); + return -EINVAL; + } else if (opts->c_volume_max <= opts->c_volume_min) { + dev_err(dev, "Error: incorrect capture volume max/min\n"); + return -EINVAL; + } else if (opts->p_volume_res <= 0) { + dev_err(dev, "Error: negative/zero playback volume resolution\n"); + return -EINVAL; + } else if (opts->c_volume_res <= 0) { + dev_err(dev, "Error: negative/zero capture volume resolution\n"); + return -EINVAL; + } + + if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) { + dev_err(dev, "Error: incorrect playback volume resolution\n"); + return -EINVAL; + } else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) { + dev_err(dev, "Error: incorrect capture volume resolution\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; + int ba_iface_id; + int status; + int idx, i; + + status = f_audio_validate_opts(audio, dev); + if (status) + return status; + + audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst); + + strings_uac1[STR_AC_IF].s = audio_opts->function_name; + + us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1)); + if (IS_ERR(us)) + return PTR_ERR(us); + + ac_header_desc = build_ac_header_desc(audio_opts); + if (!ac_header_desc) + return -ENOMEM; + + if (FUOUT_EN(audio_opts)) { + out_feature_unit_desc = build_fu_desc(audio_opts->c_chmask); + if (!out_feature_unit_desc) { + status = -ENOMEM; + goto fail; + } + } + if (FUIN_EN(audio_opts)) { + in_feature_unit_desc = build_fu_desc(audio_opts->p_chmask); + if (!in_feature_unit_desc) { + status = -ENOMEM; + goto err_free_fu; + } + } + + 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; + 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; + + if (FUOUT_EN(audio_opts)) { + u8 *i_feature; + + i_feature = (u8 *)out_feature_unit_desc + + out_feature_unit_desc->bLength - 1; + *i_feature = us[STR_FU_OUT].id; + } + if (FUIN_EN(audio_opts)) { + u8 *i_feature; + + i_feature = (u8 *)in_feature_unit_desc + + in_feature_unit_desc->bLength - 1; + *i_feature = us[STR_FU_IN].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; + + if (FUOUT_EN(audio_opts)) { + __le16 *bma = (__le16 *)&out_feature_unit_desc->bmaControls[0]; + u32 control = 0; + + if (audio_opts->c_mute_present) + control |= UAC_FU_MUTE; + if (audio_opts->c_volume_present) + control |= UAC_FU_VOLUME; + *bma = cpu_to_le16(control); + } + if (FUIN_EN(audio_opts)) { + __le16 *bma = (__le16 *)&in_feature_unit_desc->bmaControls[0]; + u32 control = 0; + + if (audio_opts->p_mute_present) + control |= UAC_FU_MUTE; + if (audio_opts->p_volume_present) + control |= UAC_FU_VOLUME; + *bma = cpu_to_le16(control); + } + + /* Set sample rates */ + for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) { + if (audio_opts->c_srates[i] == 0) + break; + memcpy(as_out_type_i_desc.tSamFreq[idx++], + &audio_opts->c_srates[i], 3); + } + as_out_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx); + as_out_type_i_desc.bSamFreqType = idx; + + for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) { + if (audio_opts->p_srates[i] == 0) + break; + memcpy(as_in_type_i_desc.tSamFreq[idx++], + &audio_opts->p_srates[i], 3); + } + as_in_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx); + as_in_type_i_desc.bSamFreqType = idx; + uac1->p_srate = audio_opts->p_srates[0]; + uac1->c_srate = audio_opts->c_srates[0]; + + /* allocate instance-specific interface IDs, and patch descriptors */ + status = usb_interface_id(c, f); + if (status < 0) + goto err_free_fu; + ac_interface_desc.bInterfaceNumber = status; + uac1->ac_intf = status; + uac1->ac_alt = 0; + + ba_iface_id = 0; + + if (EPOUT_EN(audio_opts)) { + status = usb_interface_id(c, f); + if (status < 0) + goto err_free_fu; + as_out_interface_alt_0_desc.bInterfaceNumber = status; + as_out_interface_alt_1_desc.bInterfaceNumber = status; + ac_header_desc->baInterfaceNr[ba_iface_id++] = status; + uac1->as_out_intf = status; + uac1->as_out_alt = 0; + } + + if (EPIN_EN(audio_opts)) { + status = usb_interface_id(c, f); + if (status < 0) + goto err_free_fu; + as_in_interface_alt_0_desc.bInterfaceNumber = status; + as_in_interface_alt_1_desc.bInterfaceNumber = status; + ac_header_desc->baInterfaceNr[ba_iface_id++] = status; + uac1->as_in_intf = status; + uac1->as_in_alt = 0; + } + + audio->gadget = gadget; + + status = -ENODEV; + + ac_interface_desc.bNumEndpoints = 0; + + /* allocate AC interrupt endpoint */ + if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts)) { + ep = usb_ep_autoconfig(cdev->gadget, &ac_int_ep_desc); + if (!ep) + goto err_free_fu; + uac1->int_ep = ep; + uac1->int_ep->desc = &ac_int_ep_desc; + + ac_interface_desc.bNumEndpoints = 1; + } + + /* allocate instance-specific endpoints */ + if (EPOUT_EN(audio_opts)) { + ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); + if (!ep) + goto err_free_fu; + audio->out_ep = ep; + audio->out_ep->desc = &as_out_ep_desc; + } + + if (EPIN_EN(audio_opts)) { + ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc); + if (!ep) + goto err_free_fu; + audio->in_ep = ep; + audio->in_ep->desc = &as_in_ep_desc; + } + + setup_descriptor(audio_opts); + + /* copy descriptors, and track endpoint copies */ + status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL, + NULL); + if (status) + goto err_free_fu; + + 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; + memcpy(audio->params.c_srates, audio_opts->c_srates, + sizeof(audio->params.c_srates)); + audio->params.c_ssize = audio_opts->c_ssize; + if (FUIN_EN(audio_opts)) { + audio->params.p_fu.id = USB_IN_FU_ID; + audio->params.p_fu.mute_present = audio_opts->p_mute_present; + audio->params.p_fu.volume_present = + audio_opts->p_volume_present; + audio->params.p_fu.volume_min = audio_opts->p_volume_min; + audio->params.p_fu.volume_max = audio_opts->p_volume_max; + audio->params.p_fu.volume_res = audio_opts->p_volume_res; + } + audio->params.p_chmask = audio_opts->p_chmask; + memcpy(audio->params.p_srates, audio_opts->p_srates, + sizeof(audio->params.p_srates)); + audio->params.p_ssize = audio_opts->p_ssize; + if (FUOUT_EN(audio_opts)) { + audio->params.c_fu.id = USB_OUT_FU_ID; + audio->params.c_fu.mute_present = audio_opts->c_mute_present; + audio->params.c_fu.volume_present = + audio_opts->c_volume_present; + audio->params.c_fu.volume_min = audio_opts->c_volume_min; + audio->params.c_fu.volume_max = audio_opts->c_volume_max; + audio->params.c_fu.volume_res = audio_opts->c_volume_res; + } + audio->params.req_number = audio_opts->req_number; + audio->params.fb_max = FBACK_FAST_MAX; + if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts)) + audio->notify = audio_notify; + + 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); +err_free_fu: + kfree(out_feature_unit_desc); + out_feature_unit_desc = NULL; + kfree(in_feature_unit_desc); + in_feature_unit_desc = NULL; +fail: + kfree(ac_header_desc); + ac_header_desc = NULL; + return status; +} + +/*-------------------------------------------------------------------------*/ + +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_kstrtou32 kstrtou32 +#define uac1_kstrtos16 kstrtos16 +#define uac1_kstrtobool(s, base, res) kstrtobool((s), (res)) + +static const char *u32_fmt = "%u\n"; +static const char *s16_fmt = "%hd\n"; +static const char *bool_fmt = "%u\n"; + +#define UAC1_ATTRIBUTE(type, 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, type##_fmt, 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; \ + type num; \ + \ + mutex_lock(&opts->lock); \ + if (opts->refcnt) { \ + ret = -EBUSY; \ + goto end; \ + } \ + \ + ret = uac1_kstrto##type(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) + +#define UAC1_RATE_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 = 0; \ + int i; \ + \ + mutex_lock(&opts->lock); \ + page[0] = '\0'; \ + for (i = 0; i < UAC_MAX_RATES; i++) { \ + if (opts->name##s[i] == 0) \ + break; \ + result += sprintf(page + strlen(page), "%u,", \ + opts->name##s[i]); \ + } \ + if (strlen(page) > 0) \ + page[strlen(page) - 1] = '\n'; \ + 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); \ + char *split_page = NULL; \ + int ret = -EINVAL; \ + char *token; \ + u32 num; \ + int i; \ + \ + mutex_lock(&opts->lock); \ + if (opts->refcnt) { \ + ret = -EBUSY; \ + goto end; \ + } \ + \ + i = 0; \ + memset(opts->name##s, 0x00, sizeof(opts->name##s)); \ + split_page = kstrdup(page, GFP_KERNEL); \ + while ((token = strsep(&split_page, ",")) != NULL) { \ + ret = kstrtou32(token, 0, &num); \ + if (ret) \ + goto end; \ + \ + opts->name##s[i++] = num; \ + ret = len; \ + }; \ + \ +end: \ + kfree(split_page); \ + mutex_unlock(&opts->lock); \ + return ret; \ +} \ + \ +CONFIGFS_ATTR(f_uac1_opts_, name) + +#define UAC1_ATTRIBUTE_STRING(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 = snprintf(page, sizeof(opts->name), "%s", 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 = 0; \ + \ + mutex_lock(&opts->lock); \ + if (opts->refcnt) { \ + ret = -EBUSY; \ + goto end; \ + } \ + \ + ret = snprintf(opts->name, min(sizeof(opts->name), len), \ + "%s", page); \ + \ +end: \ + mutex_unlock(&opts->lock); \ + return ret; \ +} \ + \ +CONFIGFS_ATTR(f_uac1_opts_, name) + +UAC1_ATTRIBUTE(u32, c_chmask); +UAC1_RATE_ATTRIBUTE(c_srate); +UAC1_ATTRIBUTE(u32, c_ssize); +UAC1_ATTRIBUTE(u32, p_chmask); +UAC1_RATE_ATTRIBUTE(p_srate); +UAC1_ATTRIBUTE(u32, p_ssize); +UAC1_ATTRIBUTE(u32, req_number); + +UAC1_ATTRIBUTE(bool, p_mute_present); +UAC1_ATTRIBUTE(bool, p_volume_present); +UAC1_ATTRIBUTE(s16, p_volume_min); +UAC1_ATTRIBUTE(s16, p_volume_max); +UAC1_ATTRIBUTE(s16, p_volume_res); + +UAC1_ATTRIBUTE(bool, c_mute_present); +UAC1_ATTRIBUTE(bool, c_volume_present); +UAC1_ATTRIBUTE(s16, c_volume_min); +UAC1_ATTRIBUTE(s16, c_volume_max); +UAC1_ATTRIBUTE(s16, c_volume_res); +UAC1_ATTRIBUTE_STRING(function_name); + +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_p_mute_present, + &f_uac1_opts_attr_p_volume_present, + &f_uac1_opts_attr_p_volume_min, + &f_uac1_opts_attr_p_volume_max, + &f_uac1_opts_attr_p_volume_res, + + &f_uac1_opts_attr_c_mute_present, + &f_uac1_opts_attr_c_volume_present, + &f_uac1_opts_attr_c_volume_min, + &f_uac1_opts_attr_c_volume_max, + &f_uac1_opts_attr_c_volume_res, + + &f_uac1_opts_attr_function_name, + + 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_srates[0] = UAC1_DEF_CSRATE; + opts->c_ssize = UAC1_DEF_CSSIZE; + opts->p_chmask = UAC1_DEF_PCHMASK; + opts->p_srates[0] = UAC1_DEF_PSRATE; + opts->p_ssize = UAC1_DEF_PSSIZE; + + opts->p_mute_present = UAC1_DEF_MUTE_PRESENT; + opts->p_volume_present = UAC1_DEF_VOLUME_PRESENT; + opts->p_volume_min = UAC1_DEF_MIN_DB; + opts->p_volume_max = UAC1_DEF_MAX_DB; + opts->p_volume_res = UAC1_DEF_RES_DB; + + opts->c_mute_present = UAC1_DEF_MUTE_PRESENT; + opts->c_volume_present = UAC1_DEF_VOLUME_PRESENT; + opts->c_volume_min = UAC1_DEF_MIN_DB; + opts->c_volume_max = UAC1_DEF_MAX_DB; + opts->c_volume_res = UAC1_DEF_RES_DB; + + opts->req_number = UAC1_DEF_REQ_NUM; + + snprintf(opts->function_name, sizeof(opts->function_name), "AC Interface"); + + 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); + + kfree(out_feature_unit_desc); + out_feature_unit_desc = NULL; + kfree(in_feature_unit_desc); + in_feature_unit_desc = NULL; + + kfree(ac_header_desc); + ac_header_desc = NULL; + + 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; + 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.suspend = f_audio_suspend; + uac1->g_audio.func.free_func = f_audio_free; + + return &uac1->g_audio.func; +} + +DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Ruslan Bilovol"); |