| /* |
| * f_audio.c -- USB Audio class function driver |
| * |
| * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org> |
| * Copyright (C) 2008 Analog Devices, Inc |
| * |
| * Enter bugs at http://blackfin.uclinux.org/ |
| * |
| * Licensed under the GPL-2 or later. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/device.h> |
| #include <asm/atomic.h> |
| |
| #include "u_audio.h" |
| |
| #define OUT_EP_MAX_PACKET_SIZE 200 |
| static int req_buf_size = OUT_EP_MAX_PACKET_SIZE; |
| module_param(req_buf_size, int, S_IRUGO); |
| MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size"); |
| |
| static int req_count = 256; |
| module_param(req_count, int, S_IRUGO); |
| MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count"); |
| |
| static int audio_buf_size = 48000; |
| module_param(audio_buf_size, int, S_IRUGO); |
| MODULE_PARM_DESC(audio_buf_size, "Audio buffer size"); |
| |
| 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); |
| |
| /* |
| * DESCRIPTORS ... most are static, but strings and full |
| * configuration descriptors are built on demand. |
| */ |
| |
| /* |
| * We have two interfaces- AudioControl and AudioStreaming |
| * TODO: only supcard playback currently |
| */ |
| #define F_AUDIO_AC_INTERFACE 0 |
| #define F_AUDIO_AS_INTERFACE 1 |
| #define F_AUDIO_NUM_INTERFACES 2 |
| |
| /* B.3.1 Standard AC Interface Descriptor */ |
| static struct usb_interface_descriptor ac_interface_desc __initdata = { |
| .bLength = USB_DT_INTERFACE_SIZE, |
| .bDescriptorType = USB_DT_INTERFACE, |
| .bNumEndpoints = 0, |
| .bInterfaceClass = USB_CLASS_AUDIO, |
| .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, |
| }; |
| |
| DECLARE_UAC_AC_HEADER_DESCRIPTOR(2); |
| |
| #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES) |
| /* 1 input terminal, 1 output terminal and 1 feature unit */ |
| #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \ |
| + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0)) |
| /* B.3.2 Class-Specific AC Interface Descriptor */ |
| static struct uac_ac_header_descriptor_2 ac_header_desc = { |
| .bLength = UAC_DT_AC_HEADER_LENGTH, |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_HEADER, |
| .bcdADC = __constant_cpu_to_le16(0x0100), |
| .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH), |
| .bInCollection = F_AUDIO_NUM_INTERFACES, |
| .baInterfaceNr = { |
| [0] = F_AUDIO_AC_INTERFACE, |
| [1] = F_AUDIO_AS_INTERFACE, |
| } |
| }; |
| |
| #define INPUT_TERMINAL_ID 1 |
| static struct uac_input_terminal_descriptor input_terminal_desc = { |
| .bLength = UAC_DT_INPUT_TERMINAL_SIZE, |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_INPUT_TERMINAL, |
| .bTerminalID = INPUT_TERMINAL_ID, |
| .wTerminalType = UAC_TERMINAL_STREAMING, |
| .bAssocTerminal = 0, |
| .wChannelConfig = 0x3, |
| }; |
| |
| DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0); |
| |
| #define FEATURE_UNIT_ID 2 |
| 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 = INPUT_TERMINAL_ID, |
| .bControlSize = 2, |
| .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME), |
| }; |
| |
| static struct usb_audio_control mute_control = { |
| .list = LIST_HEAD_INIT(mute_control.list), |
| .name = "Mute Control", |
| .type = UAC_MUTE_CONTROL, |
| /* 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 = "Volume Control", |
| .type = UAC_VOLUME_CONTROL, |
| /* 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 = "Mute & Volume Control", |
| .type = UAC_FEATURE_UNIT, |
| .desc = (struct usb_descriptor_header *)&feature_unit_desc, |
| }; |
| |
| #define OUTPUT_TERMINAL_ID 3 |
| static struct uac_output_terminal_descriptor output_terminal_desc = { |
| .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, |
| .bTerminalID = OUTPUT_TERMINAL_ID, |
| .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER, |
| .bAssocTerminal = FEATURE_UNIT_ID, |
| .bSourceID = FEATURE_UNIT_ID, |
| }; |
| |
| /* B.4.1 Standard AS Interface Descriptor */ |
| static struct usb_interface_descriptor as_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_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 uac_as_header_descriptor as_header_desc = { |
| .bLength = UAC_DT_AS_HEADER_SIZE, |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_AS_GENERAL, |
| .bTerminalLink = INPUT_TERMINAL_ID, |
| .bDelay = 1, |
| .wFormatTag = UAC_FORMAT_TYPE_I_PCM, |
| }; |
| |
| DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1); |
| |
| static struct uac_format_type_i_discrete_descriptor_1 as_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 __initdata = { |
| .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, |
| .bDescriptorType = USB_DT_ENDPOINT, |
| .bEndpointAddress = USB_DIR_OUT, |
| .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE |
| | USB_ENDPOINT_XFER_ISOC, |
| .wMaxPacketSize = __constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE), |
| .bInterval = 4, |
| }; |
| |
| /* Class-specific AS ISO OUT Endpoint Descriptor */ |
| static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = { |
| .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, |
| .bDescriptorType = USB_DT_CS_ENDPOINT, |
| .bDescriptorSubtype = UAC_EP_GENERAL, |
| .bmAttributes = 1, |
| .bLockDelayUnits = 1, |
| .wLockDelay = __constant_cpu_to_le16(1), |
| }; |
| |
| static struct usb_descriptor_header *f_audio_desc[] __initdata = { |
| (struct usb_descriptor_header *)&ac_interface_desc, |
| (struct usb_descriptor_header *)&ac_header_desc, |
| |
| (struct usb_descriptor_header *)&input_terminal_desc, |
| (struct usb_descriptor_header *)&output_terminal_desc, |
| (struct usb_descriptor_header *)&feature_unit_desc, |
| |
| (struct usb_descriptor_header *)&as_interface_alt_0_desc, |
| (struct usb_descriptor_header *)&as_interface_alt_1_desc, |
| (struct usb_descriptor_header *)&as_header_desc, |
| |
| (struct usb_descriptor_header *)&as_type_i_desc, |
| |
| (struct usb_descriptor_header *)&as_out_ep_desc, |
| (struct usb_descriptor_header *)&as_iso_out_desc, |
| NULL, |
| }; |
| |
| /* string IDs are assigned dynamically */ |
| |
| #define STRING_MANUFACTURER_IDX 0 |
| #define STRING_PRODUCT_IDX 1 |
| |
| static char manufacturer[50]; |
| |
| static struct usb_string strings_dev[] = { |
| [STRING_MANUFACTURER_IDX].s = manufacturer, |
| [STRING_PRODUCT_IDX].s = DRIVER_DESC, |
| { } /* end of list */ |
| }; |
| |
| static struct usb_gadget_strings stringtab_dev = { |
| .language = 0x0409, /* en-us */ |
| .strings = strings_dev, |
| }; |
| |
| static struct usb_gadget_strings *audio_strings[] = { |
| &stringtab_dev, |
| NULL, |
| }; |
| |
| /* |
| * This function is an ALSA sound card following USB Audio Class Spec 1.0. |
| */ |
| |
| /*-------------------------------------------------------------------------*/ |
| struct f_audio_buf { |
| u8 *buf; |
| int actual; |
| struct list_head list; |
| }; |
| |
| static struct f_audio_buf *f_audio_buffer_alloc(int buf_size) |
| { |
| struct f_audio_buf *copy_buf; |
| |
| copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC); |
| if (!copy_buf) |
| return ERR_PTR(-ENOMEM); |
| |
| copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC); |
| if (!copy_buf->buf) { |
| kfree(copy_buf); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| return copy_buf; |
| } |
| |
| static void f_audio_buffer_free(struct f_audio_buf *audio_buf) |
| { |
| kfree(audio_buf->buf); |
| kfree(audio_buf); |
| } |
| /*-------------------------------------------------------------------------*/ |
| |
| struct f_audio { |
| struct gaudio card; |
| |
| /* endpoints handle full and/or high speeds */ |
| struct usb_ep *out_ep; |
| struct usb_endpoint_descriptor *out_desc; |
| |
| spinlock_t lock; |
| struct f_audio_buf *copy_buf; |
| struct work_struct playback_work; |
| struct list_head play_queue; |
| |
| /* Control Set command */ |
| struct list_head cs; |
| u8 set_cmd; |
| struct usb_audio_control *set_con; |
| }; |
| |
| static inline struct f_audio *func_to_audio(struct usb_function *f) |
| { |
| return container_of(f, struct f_audio, card.func); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static void f_audio_playback_work(struct work_struct *data) |
| { |
| struct f_audio *audio = container_of(data, struct f_audio, |
| playback_work); |
| struct f_audio_buf *play_buf; |
| |
| spin_lock_irq(&audio->lock); |
| if (list_empty(&audio->play_queue)) { |
| spin_unlock_irq(&audio->lock); |
| return; |
| } |
| play_buf = list_first_entry(&audio->play_queue, |
| struct f_audio_buf, list); |
| list_del(&play_buf->list); |
| spin_unlock_irq(&audio->lock); |
| |
| u_audio_playback(&audio->card, play_buf->buf, play_buf->actual); |
| f_audio_buffer_free(play_buf); |
| |
| return; |
| } |
| |
| static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req) |
| { |
| struct f_audio *audio = req->context; |
| struct usb_composite_dev *cdev = audio->card.func.config->cdev; |
| struct f_audio_buf *copy_buf = audio->copy_buf; |
| int err; |
| |
| if (!copy_buf) |
| return -EINVAL; |
| |
| /* Copy buffer is full, add it to the play_queue */ |
| if (audio_buf_size - copy_buf->actual < req->actual) { |
| list_add_tail(©_buf->list, &audio->play_queue); |
| schedule_work(&audio->playback_work); |
| copy_buf = f_audio_buffer_alloc(audio_buf_size); |
| if (IS_ERR(copy_buf)) |
| return -ENOMEM; |
| } |
| |
| memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual); |
| copy_buf->actual += req->actual; |
| audio->copy_buf = copy_buf; |
| |
| err = usb_ep_queue(ep, req, GFP_ATOMIC); |
| if (err) |
| ERROR(cdev, "%s queue req: %d\n", ep->name, err); |
| |
| return 0; |
| |
| } |
| |
| static void f_audio_complete(struct usb_ep *ep, struct usb_request *req) |
| { |
| struct f_audio *audio = req->context; |
| int status = req->status; |
| u32 data = 0; |
| struct usb_ep *out_ep = audio->out_ep; |
| |
| switch (status) { |
| |
| case 0: /* normal completion? */ |
| if (ep == out_ep) |
| f_audio_out_ep_complete(ep, req); |
| else if (audio->set_con) { |
| memcpy(&data, req->buf, req->length); |
| audio->set_con->set(audio->set_con, audio->set_cmd, |
| le16_to_cpu(data)); |
| audio->set_con = NULL; |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static int audio_set_intf_req(struct usb_function *f, |
| const struct usb_ctrlrequest *ctrl) |
| { |
| struct f_audio *audio = func_to_audio(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, &audio->cs, list) { |
| if (cs->id == id) { |
| list_for_each_entry(con, &cs->control, list) { |
| if (con->type == con_sel) { |
| audio->set_con = con; |
| break; |
| } |
| } |
| break; |
| } |
| } |
| |
| audio->set_cmd = cmd; |
| req->context = audio; |
| req->complete = f_audio_complete; |
| |
| return len; |
| } |
| |
| static int audio_get_intf_req(struct usb_function *f, |
| const struct usb_ctrlrequest *ctrl) |
| { |
| struct f_audio *audio = func_to_audio(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, &audio->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 = audio; |
| req->complete = f_audio_complete; |
| memcpy(req->buf, &value, len); |
| |
| return len; |
| } |
| |
| 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 = 0; |
| 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 = 3; |
| 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 f_audio *audio = func_to_audio(f); |
| struct usb_composite_dev *cdev = f->config->cdev; |
| struct usb_ep *out_ep = audio->out_ep; |
| struct usb_request *req; |
| int i = 0, err = 0; |
| |
| DBG(cdev, "intf %d, alt %d\n", intf, alt); |
| |
| if (intf == 1) { |
| if (alt == 1) { |
| usb_ep_enable(out_ep, audio->out_desc); |
| out_ep->driver_data = audio; |
| audio->copy_buf = f_audio_buffer_alloc(audio_buf_size); |
| if (IS_ERR(audio->copy_buf)) |
| return -ENOMEM; |
| |
| /* |
| * allocate a bunch of read buffers |
| * and queue them all at once. |
| */ |
| for (i = 0; i < req_count && err == 0; i++) { |
| req = usb_ep_alloc_request(out_ep, GFP_ATOMIC); |
| if (req) { |
| req->buf = kzalloc(req_buf_size, |
| GFP_ATOMIC); |
| if (req->buf) { |
| req->length = req_buf_size; |
| req->context = audio; |
| req->complete = |
| f_audio_complete; |
| err = usb_ep_queue(out_ep, |
| req, GFP_ATOMIC); |
| if (err) |
| ERROR(cdev, |
| "%s queue req: %d\n", |
| out_ep->name, err); |
| } else |
| err = -ENOMEM; |
| } else |
| err = -ENOMEM; |
| } |
| |
| } else { |
| struct f_audio_buf *copy_buf = audio->copy_buf; |
| if (copy_buf) { |
| list_add_tail(©_buf->list, |
| &audio->play_queue); |
| schedule_work(&audio->playback_work); |
| } |
| } |
| } |
| |
| return err; |
| } |
| |
| static void f_audio_disable(struct usb_function *f) |
| { |
| return; |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static void f_audio_build_desc(struct f_audio *audio) |
| { |
| struct gaudio *card = &audio->card; |
| u8 *sam_freq; |
| int rate; |
| |
| /* Set channel numbers */ |
| input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card); |
| as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card); |
| |
| /* Set sample rates */ |
| rate = u_audio_get_playback_rate(card); |
| sam_freq = as_type_i_desc.tSamFreq[0]; |
| memcpy(sam_freq, &rate, 3); |
| |
| /* Todo: Set Sample bits and other parameters */ |
| |
| return; |
| } |
| |
| /* audio function driver setup/binding */ |
| static int __init |
| f_audio_bind(struct usb_configuration *c, struct usb_function *f) |
| { |
| struct usb_composite_dev *cdev = c->cdev; |
| struct f_audio *audio = func_to_audio(f); |
| int status; |
| struct usb_ep *ep; |
| |
| f_audio_build_desc(audio); |
| |
| /* allocate instance-specific interface IDs, and patch descriptors */ |
| status = usb_interface_id(c, f); |
| if (status < 0) |
| goto fail; |
| ac_interface_desc.bInterfaceNumber = status; |
| |
| status = usb_interface_id(c, f); |
| if (status < 0) |
| goto fail; |
| as_interface_alt_0_desc.bInterfaceNumber = status; |
| as_interface_alt_1_desc.bInterfaceNumber = status; |
| |
| status = -ENODEV; |
| |
| /* allocate instance-specific endpoints */ |
| ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); |
| if (!ep) |
| goto fail; |
| audio->out_ep = ep; |
| ep->driver_data = cdev; /* claim */ |
| |
| status = -ENOMEM; |
| |
| /* supcard all relevant hardware speeds... we expect that when |
| * hardware is dual speed, all bulk-capable endpoints work at |
| * both speeds |
| */ |
| |
| /* copy descriptors, and track endpoint copies */ |
| if (gadget_is_dualspeed(c->cdev->gadget)) { |
| c->highspeed = true; |
| f->hs_descriptors = usb_copy_descriptors(f_audio_desc); |
| } else |
| f->descriptors = usb_copy_descriptors(f_audio_desc); |
| |
| return 0; |
| |
| fail: |
| |
| return status; |
| } |
| |
| static void |
| f_audio_unbind(struct usb_configuration *c, struct usb_function *f) |
| { |
| struct f_audio *audio = func_to_audio(f); |
| |
| usb_free_descriptors(f->descriptors); |
| kfree(audio); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) |
| { |
| con->data[cmd] = 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 */ |
| int __init control_selector_init(struct f_audio *audio) |
| { |
| INIT_LIST_HEAD(&audio->cs); |
| list_add(&feature_unit.list, &audio->cs); |
| |
| INIT_LIST_HEAD(&feature_unit.control); |
| list_add(&mute_control.list, &feature_unit.control); |
| list_add(&volume_control.list, &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; |
| |
| return 0; |
| } |
| |
| /** |
| * audio_bind_config - add USB audio fucntion to a configuration |
| * @c: the configuration to supcard the USB audio function |
| * Context: single threaded during gadget setup |
| * |
| * Returns zero on success, else negative errno. |
| */ |
| int __init audio_bind_config(struct usb_configuration *c) |
| { |
| struct f_audio *audio; |
| int status; |
| |
| /* allocate and initialize one new instance */ |
| audio = kzalloc(sizeof *audio, GFP_KERNEL); |
| if (!audio) |
| return -ENOMEM; |
| |
| audio->card.func.name = "g_audio"; |
| audio->card.gadget = c->cdev->gadget; |
| |
| INIT_LIST_HEAD(&audio->play_queue); |
| spin_lock_init(&audio->lock); |
| |
| /* set up ASLA audio devices */ |
| status = gaudio_setup(&audio->card); |
| if (status < 0) |
| goto setup_fail; |
| |
| audio->card.func.strings = audio_strings; |
| audio->card.func.bind = f_audio_bind; |
| audio->card.func.unbind = f_audio_unbind; |
| audio->card.func.set_alt = f_audio_set_alt; |
| audio->card.func.setup = f_audio_setup; |
| audio->card.func.disable = f_audio_disable; |
| audio->out_desc = &as_out_ep_desc; |
| |
| control_selector_init(audio); |
| |
| INIT_WORK(&audio->playback_work, f_audio_playback_work); |
| |
| status = usb_add_function(c, &audio->card.func); |
| if (status) |
| goto add_fail; |
| |
| INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n", |
| audio_buf_size, req_buf_size, req_count); |
| |
| return status; |
| |
| add_fail: |
| gaudio_cleanup(); |
| setup_fail: |
| kfree(audio); |
| return status; |
| } |