| /* |
| * Gadget Function Driver for USB audio source device |
| * |
| * Copyright (C) 2012 Google, Inc. |
| * |
| * This software is licensed under the terms of the GNU General Public |
| * License version 2, as published by the Free Software Foundation, and |
| * may be copied, distributed, and modified under those terms. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| */ |
| |
| #include <asm/dma.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/device.h> |
| #include <linux/usb/audio.h> |
| #include <linux/wait.h> |
| #include <sound/core.h> |
| #include <sound/initval.h> |
| #include <sound/pcm.h> |
| |
| #define SAMPLE_RATE 44100 |
| #define FRAMES_PER_MSEC (SAMPLE_RATE / 1000) |
| |
| #define IN_EP_MAX_PACKET_SIZE 256 |
| |
| /* Number of requests to allocate */ |
| #define IN_EP_REQ_COUNT 4 |
| |
| #define AUDIO_AC_INTERFACE 0 |
| #define AUDIO_AS_INTERFACE 1 |
| #define AUDIO_NUM_INTERFACES 2 |
| |
| /* B.3.1 Standard AC Interface Descriptor */ |
| static struct usb_interface_descriptor audio_source_ac_interface_desc = { |
| .bLength = USB_DT_INTERFACE_SIZE, |
| .bDescriptorType = USB_DT_INTERFACE, |
| .bNumEndpoints = 0, |
| .bInterfaceClass = USB_CLASS_AUDIO, |
| .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, |
| }; |
| |
| |
| #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(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 uac1_ac_header_descriptor_2 audio_source_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 = AUDIO_NUM_INTERFACES, |
| .baInterfaceNr = { |
| [0] = AUDIO_AC_INTERFACE, |
| [1] = 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_INPUT_TERMINAL_MICROPHONE, |
| .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, |
| }; |
| |
| #define OUTPUT_TERMINAL_ID 3 |
| static struct uac1_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_TERMINAL_STREAMING, |
| .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 uac1_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, |
| }; |
| |
| 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 IN Endpoint Descriptor for highspeed */ |
| static struct usb_endpoint_descriptor hs_as_in_ep_desc = { |
| .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, |
| .bDescriptorType = USB_DT_ENDPOINT, |
| .bEndpointAddress = USB_DIR_IN, |
| .bmAttributes = USB_ENDPOINT_SYNC_SYNC |
| | USB_ENDPOINT_XFER_ISOC, |
| .wMaxPacketSize = __constant_cpu_to_le16(IN_EP_MAX_PACKET_SIZE), |
| .bInterval = 4, /* poll 1 per millisecond */ |
| }; |
| |
| /* Standard ISO IN Endpoint Descriptor for highspeed */ |
| static struct usb_endpoint_descriptor fs_as_in_ep_desc = { |
| .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, |
| .bDescriptorType = USB_DT_ENDPOINT, |
| .bEndpointAddress = USB_DIR_IN, |
| .bmAttributes = USB_ENDPOINT_SYNC_SYNC |
| | USB_ENDPOINT_XFER_ISOC, |
| .wMaxPacketSize = __constant_cpu_to_le16(IN_EP_MAX_PACKET_SIZE), |
| .bInterval = 1, /* poll 1 per millisecond */ |
| }; |
| |
| /* 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 = 1, |
| .wLockDelay = __constant_cpu_to_le16(1), |
| }; |
| |
| static struct usb_descriptor_header *hs_audio_desc[] = { |
| (struct usb_descriptor_header *)&audio_source_ac_interface_desc, |
| (struct usb_descriptor_header *)&audio_source_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 *)&hs_as_in_ep_desc, |
| (struct usb_descriptor_header *)&as_iso_in_desc, |
| NULL, |
| }; |
| |
| static struct usb_descriptor_header *fs_audio_desc[] = { |
| (struct usb_descriptor_header *)&audio_source_ac_interface_desc, |
| (struct usb_descriptor_header *)&audio_source_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 *)&fs_as_in_ep_desc, |
| (struct usb_descriptor_header *)&as_iso_in_desc, |
| NULL, |
| }; |
| |
| static struct snd_pcm_hardware audio_hw_info = { |
| .info = SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_MMAP_VALID | |
| SNDRV_PCM_INFO_BATCH | |
| SNDRV_PCM_INFO_INTERLEAVED | |
| SNDRV_PCM_INFO_BLOCK_TRANSFER, |
| |
| .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| .channels_min = 2, |
| .channels_max = 2, |
| .rate_min = SAMPLE_RATE, |
| .rate_max = SAMPLE_RATE, |
| |
| .buffer_bytes_max = 1024 * 1024, |
| .period_bytes_min = 64, |
| .period_bytes_max = 512 * 1024, |
| .periods_min = 2, |
| .periods_max = 1024, |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| struct audio_source_config { |
| int card; |
| int device; |
| }; |
| |
| struct audio_dev { |
| struct usb_function func; |
| struct snd_card *card; |
| struct snd_pcm *pcm; |
| struct snd_pcm_substream *substream; |
| |
| struct list_head idle_reqs; |
| struct usb_ep *in_ep; |
| |
| spinlock_t lock; |
| |
| /* beginning, end and current position in our buffer */ |
| void *buffer_start; |
| void *buffer_end; |
| void *buffer_pos; |
| |
| /* byte size of a "period" */ |
| unsigned int period; |
| /* bytes sent since last call to snd_pcm_period_elapsed */ |
| unsigned int period_offset; |
| /* time we started playing */ |
| ktime_t start_time; |
| /* number of frames sent since start_time */ |
| s64 frames_sent; |
| |
| bool audio_ep_enabled; |
| }; |
| |
| static inline struct audio_dev *func_to_audio_source(struct usb_function *f) |
| { |
| return container_of(f, struct audio_dev, func); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static struct usb_request *audio_request_new(struct usb_ep *ep, int buffer_size) |
| { |
| struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL); |
| if (!req) |
| return NULL; |
| |
| req->buf = kmalloc(buffer_size, GFP_KERNEL); |
| if (!req->buf) { |
| usb_ep_free_request(ep, req); |
| return NULL; |
| } |
| req->length = buffer_size; |
| return req; |
| } |
| |
| static void audio_request_free(struct usb_request *req, struct usb_ep *ep) |
| { |
| if (req) { |
| kfree(req->buf); |
| usb_ep_free_request(ep, req); |
| } |
| } |
| |
| static void audio_req_put(struct audio_dev *audio, struct usb_request *req) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&audio->lock, flags); |
| list_add_tail(&req->list, &audio->idle_reqs); |
| spin_unlock_irqrestore(&audio->lock, flags); |
| } |
| |
| static struct usb_request *audio_req_get(struct audio_dev *audio) |
| { |
| unsigned long flags; |
| struct usb_request *req; |
| |
| spin_lock_irqsave(&audio->lock, flags); |
| if (list_empty(&audio->idle_reqs)) { |
| req = 0; |
| } else { |
| req = list_first_entry(&audio->idle_reqs, struct usb_request, |
| list); |
| list_del(&req->list); |
| } |
| spin_unlock_irqrestore(&audio->lock, flags); |
| return req; |
| } |
| |
| /* send the appropriate number of packets to match our bitrate */ |
| static void audio_send(struct audio_dev *audio) |
| { |
| struct snd_pcm_runtime *runtime; |
| struct usb_request *req; |
| int length, length1, length2, ret; |
| s64 msecs; |
| s64 frames; |
| ktime_t now; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&audio->lock, flags); |
| /* audio->substream will be null if we have been closed */ |
| if (!audio->substream) { |
| spin_unlock_irqrestore(&audio->lock, flags); |
| return; |
| } |
| /* audio->buffer_pos will be null if we have been stopped */ |
| if (!audio->buffer_pos) { |
| spin_unlock_irqrestore(&audio->lock, flags); |
| return; |
| } |
| |
| runtime = audio->substream->runtime; |
| spin_unlock_irqrestore(&audio->lock, flags); |
| |
| /* compute number of frames to send */ |
| now = ktime_get(); |
| msecs = ktime_to_ns(now) - ktime_to_ns(audio->start_time); |
| do_div(msecs, 1000000); |
| frames = msecs * SAMPLE_RATE; |
| do_div(frames, 1000); |
| |
| /* Readjust our frames_sent if we fall too far behind. |
| * If we get too far behind it is better to drop some frames than |
| * to keep sending data too fast in an attempt to catch up. |
| */ |
| if (frames - audio->frames_sent > 10 * FRAMES_PER_MSEC) |
| audio->frames_sent = frames - FRAMES_PER_MSEC; |
| |
| frames -= audio->frames_sent; |
| |
| /* We need to send something to keep the pipeline going */ |
| if (frames <= 0) |
| frames = FRAMES_PER_MSEC; |
| |
| while (frames > 0) { |
| req = audio_req_get(audio); |
| spin_lock_irqsave(&audio->lock, flags); |
| /* audio->substream will be null if we have been closed */ |
| if (!audio->substream) { |
| spin_unlock_irqrestore(&audio->lock, flags); |
| return; |
| } |
| /* audio->buffer_pos will be null if we have been stopped */ |
| if (!audio->buffer_pos) { |
| spin_unlock_irqrestore(&audio->lock, flags); |
| return; |
| } |
| if (!req) { |
| spin_unlock_irqrestore(&audio->lock, flags); |
| break; |
| } |
| |
| length = frames_to_bytes(runtime, frames); |
| if (length > IN_EP_MAX_PACKET_SIZE) |
| length = IN_EP_MAX_PACKET_SIZE; |
| |
| if (audio->buffer_pos + length > audio->buffer_end) |
| length1 = audio->buffer_end - audio->buffer_pos; |
| else |
| length1 = length; |
| memcpy(req->buf, audio->buffer_pos, length1); |
| if (length1 < length) { |
| /* Wrap around and copy remaining length |
| * at beginning of buffer. |
| */ |
| length2 = length - length1; |
| memcpy(req->buf + length1, audio->buffer_start, |
| length2); |
| audio->buffer_pos = audio->buffer_start + length2; |
| } else { |
| audio->buffer_pos += length1; |
| if (audio->buffer_pos >= audio->buffer_end) |
| audio->buffer_pos = audio->buffer_start; |
| } |
| |
| req->length = length; |
| spin_unlock_irqrestore(&audio->lock, flags); |
| ret = usb_ep_queue(audio->in_ep, req, GFP_ATOMIC); |
| if (ret < 0) { |
| pr_err("usb_ep_queue failed ret: %d\n", ret); |
| audio_req_put(audio, req); |
| break; |
| } |
| |
| frames -= bytes_to_frames(runtime, length); |
| audio->frames_sent += bytes_to_frames(runtime, length); |
| } |
| } |
| |
| static void audio_control_complete(struct usb_ep *ep, struct usb_request *req) |
| { |
| /* nothing to do here */ |
| } |
| |
| static void audio_data_complete(struct usb_ep *ep, struct usb_request *req) |
| { |
| struct audio_dev *audio = req->context; |
| |
| pr_debug("audio_data_complete req->status %d req->actual %d\n", |
| req->status, req->actual); |
| |
| audio_req_put(audio, req); |
| |
| if (!audio->buffer_start || req->status) |
| return; |
| |
| audio->period_offset += req->actual; |
| if (audio->period_offset >= audio->period) { |
| snd_pcm_period_elapsed(audio->substream); |
| audio->period_offset = 0; |
| } |
| audio_send(audio); |
| } |
| |
| static int audio_source_set_endpoint_req(struct usb_function *f, |
| const struct usb_ctrlrequest *ctrl) |
| { |
| 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); |
| |
| pr_debug("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: |
| case UAC_SET_MIN: |
| case UAC_SET_MAX: |
| case UAC_SET_RES: |
| value = len; |
| break; |
| default: |
| break; |
| } |
| |
| return value; |
| } |
| |
| static int audio_source_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); |
| u8 *buf = cdev->req->buf; |
| |
| pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", |
| ctrl->bRequest, w_value, len, ep); |
| |
| if (w_value == UAC_EP_CS_ATTR_SAMPLE_RATE << 8) { |
| switch (ctrl->bRequest) { |
| case UAC_GET_CUR: |
| case UAC_GET_MIN: |
| case UAC_GET_MAX: |
| case UAC_GET_RES: |
| /* return our sample rate */ |
| buf[0] = (u8)SAMPLE_RATE; |
| buf[1] = (u8)(SAMPLE_RATE >> 8); |
| buf[2] = (u8)(SAMPLE_RATE >> 16); |
| value = 3; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| return value; |
| } |
| |
| static int |
| 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_source_set_endpoint_req(f, ctrl); |
| break; |
| |
| case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: |
| value = audio_source_get_endpoint_req(f, ctrl); |
| break; |
| } |
| |
| /* respond with data transfer or status phase? */ |
| if (value >= 0) { |
| pr_debug("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; |
| req->complete = audio_control_complete; |
| value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); |
| if (value < 0) |
| pr_err("audio response on err %d\n", value); |
| } |
| |
| /* device either stalls (value < 0) or reports success */ |
| return value; |
| } |
| |
| static int audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
| { |
| struct audio_dev *audio = func_to_audio_source(f); |
| struct usb_composite_dev *cdev = f->config->cdev; |
| int ret; |
| |
| pr_debug("audio_set_alt intf %d, alt %d\n", intf, alt); |
| |
| if (intf == as_interface_alt_1_desc.bInterfaceNumber) { |
| if (alt && !audio->audio_ep_enabled) { |
| ret = config_ep_by_speed(cdev->gadget, f, audio->in_ep); |
| if (ret) { |
| audio->in_ep->desc = NULL; |
| ERROR(cdev, "config_ep fail ep %s, result %d\n", |
| audio->in_ep->name, ret); |
| return ret; |
| } |
| ret = usb_ep_enable(audio->in_ep); |
| if (ret) { |
| ERROR(cdev, "failedto enable ep%s, result %d\n", |
| audio->in_ep->name, ret); |
| return ret; |
| } |
| audio->audio_ep_enabled = true; |
| } else if (!alt && audio->audio_ep_enabled) { |
| usb_ep_disable(audio->in_ep); |
| audio->audio_ep_enabled = false; |
| } |
| } |
| return 0; |
| } |
| |
| static void audio_disable(struct usb_function *f) |
| { |
| struct audio_dev *audio = func_to_audio_source(f); |
| |
| pr_debug("audio_disable\n"); |
| if (audio->audio_ep_enabled) { |
| usb_ep_disable(audio->in_ep); |
| audio->audio_ep_enabled = false; |
| } |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static void audio_build_desc(struct audio_dev *audio) |
| { |
| u8 *sam_freq; |
| int rate; |
| |
| /* Set channel numbers */ |
| input_terminal_desc.bNrChannels = 2; |
| as_type_i_desc.bNrChannels = 2; |
| |
| /* Set sample rates */ |
| rate = SAMPLE_RATE; |
| sam_freq = as_type_i_desc.tSamFreq[0]; |
| memcpy(sam_freq, &rate, 3); |
| } |
| |
| /* audio function driver setup/binding */ |
| static int |
| audio_bind(struct usb_configuration *c, struct usb_function *f) |
| { |
| struct usb_composite_dev *cdev = c->cdev; |
| struct audio_dev *audio = func_to_audio_source(f); |
| int status; |
| struct usb_ep *ep; |
| struct usb_request *req; |
| int i; |
| |
| audio_build_desc(audio); |
| |
| /* allocate instance-specific interface IDs, and patch descriptors */ |
| status = usb_interface_id(c, f); |
| if (status < 0) |
| goto fail; |
| audio_source_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 our endpoint */ |
| ep = usb_ep_autoconfig(cdev->gadget, &fs_as_in_ep_desc); |
| if (!ep) |
| goto fail; |
| audio->in_ep = ep; |
| ep->driver_data = audio; /* claim */ |
| |
| if (gadget_is_dualspeed(c->cdev->gadget)) |
| hs_as_in_ep_desc.bEndpointAddress = |
| fs_as_in_ep_desc.bEndpointAddress; |
| |
| for (i = 0, status = 0; i < IN_EP_REQ_COUNT && status == 0; i++) { |
| req = audio_request_new(ep, IN_EP_MAX_PACKET_SIZE); |
| if (req) { |
| req->context = audio; |
| req->complete = audio_data_complete; |
| audio_req_put(audio, req); |
| } else |
| status = -ENOMEM; |
| } |
| |
| fail: |
| return status; |
| } |
| |
| static void |
| audio_unbind(struct usb_configuration *c, struct usb_function *f) |
| { |
| struct audio_dev *audio = func_to_audio_source(f); |
| struct usb_request *req; |
| |
| while ((req = audio_req_get(audio))) |
| audio_request_free(req, audio->in_ep); |
| |
| snd_card_free_when_closed(audio->card); |
| audio->card = NULL; |
| audio->pcm = NULL; |
| audio->substream = NULL; |
| audio->in_ep = NULL; |
| } |
| |
| static void audio_pcm_playback_start(struct audio_dev *audio) |
| { |
| audio->start_time = ktime_get(); |
| audio->frames_sent = 0; |
| audio_send(audio); |
| } |
| |
| static void audio_pcm_playback_stop(struct audio_dev *audio) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&audio->lock, flags); |
| audio->buffer_start = 0; |
| audio->buffer_end = 0; |
| audio->buffer_pos = 0; |
| spin_unlock_irqrestore(&audio->lock, flags); |
| } |
| |
| static int audio_pcm_open(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct audio_dev *audio = substream->private_data; |
| |
| runtime->private_data = audio; |
| runtime->hw = audio_hw_info; |
| snd_pcm_limit_hw_rates(runtime); |
| runtime->hw.channels_max = 2; |
| |
| audio->substream = substream; |
| return 0; |
| } |
| |
| static int audio_pcm_close(struct snd_pcm_substream *substream) |
| { |
| struct audio_dev *audio = substream->private_data; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&audio->lock, flags); |
| audio->substream = NULL; |
| spin_unlock_irqrestore(&audio->lock, flags); |
| |
| return 0; |
| } |
| |
| static int audio_pcm_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| struct snd_dma_buffer *buf = &substream->dma_buffer; |
| unsigned int channels = params_channels(params); |
| unsigned int rate = params_rate(params); |
| |
| if (rate != SAMPLE_RATE) |
| return -EINVAL; |
| if (channels != 2) |
| return -EINVAL; |
| |
| if (!substream->pcm->card->dev->coherent_dma_mask) |
| substream->pcm->card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
| |
| buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| buf->dev.dev = substream->pcm->card->dev; |
| buf->private_data = NULL; |
| buf->area = dma_alloc_coherent(substream->pcm->card->dev, |
| params_buffer_bytes(params), |
| &buf->addr, GFP_KERNEL); |
| if (!buf->area) |
| return -ENOMEM; |
| buf->bytes = params_buffer_bytes(params); |
| snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| return 0; |
| } |
| |
| static int audio_pcm_hw_free(struct snd_pcm_substream *substream) |
| { |
| struct snd_dma_buffer *buf = &substream->dma_buffer; |
| |
| if (buf->area != NULL) |
| dma_free_coherent(substream->pcm->card->dev, buf->bytes, |
| buf->area, buf->addr); |
| buf->area = NULL; |
| return 0; |
| } |
| |
| static int audio_pcm_prepare(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct audio_dev *audio = runtime->private_data; |
| |
| audio->period = snd_pcm_lib_period_bytes(substream); |
| audio->period_offset = 0; |
| audio->buffer_start = runtime->dma_area; |
| audio->buffer_end = audio->buffer_start |
| + snd_pcm_lib_buffer_bytes(substream); |
| audio->buffer_pos = audio->buffer_start; |
| |
| return 0; |
| } |
| |
| static snd_pcm_uframes_t audio_pcm_pointer(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct audio_dev *audio = runtime->private_data; |
| ssize_t bytes = audio->buffer_pos - audio->buffer_start; |
| |
| /* return offset of next frame to fill in our buffer */ |
| return bytes_to_frames(runtime, bytes); |
| } |
| |
| static int audio_pcm_playback_trigger(struct snd_pcm_substream *substream, |
| int cmd) |
| { |
| struct audio_dev *audio = substream->runtime->private_data; |
| int ret = 0; |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| case SNDRV_PCM_TRIGGER_RESUME: |
| audio_pcm_playback_start(audio); |
| break; |
| |
| case SNDRV_PCM_TRIGGER_STOP: |
| case SNDRV_PCM_TRIGGER_SUSPEND: |
| audio_pcm_playback_stop(audio); |
| break; |
| |
| default: |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static int audio_pcm_mmap(struct snd_pcm_substream *substream, |
| struct vm_area_struct *vma) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| |
| if (runtime->dma_addr && runtime->dma_bytes) { |
| return dma_mmap_coherent(substream->pcm->card->dev, vma, |
| runtime->dma_area, |
| runtime->dma_addr, |
| runtime->dma_bytes); |
| } else { |
| pr_err("Physical address or size of buf is NULL"); |
| return -EINVAL; |
| } |
| } |
| |
| static struct audio_dev _audio_dev = { |
| .func = { |
| .name = "audio_source", |
| .bind = audio_bind, |
| .unbind = audio_unbind, |
| .set_alt = audio_set_alt, |
| .setup = audio_setup, |
| .disable = audio_disable, |
| .descriptors = fs_audio_desc, |
| .hs_descriptors = hs_audio_desc, |
| }, |
| .lock = __SPIN_LOCK_UNLOCKED(_audio_dev.lock), |
| .idle_reqs = LIST_HEAD_INIT(_audio_dev.idle_reqs), |
| }; |
| |
| static struct snd_pcm_ops audio_playback_ops = { |
| .open = audio_pcm_open, |
| .close = audio_pcm_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = audio_pcm_hw_params, |
| .hw_free = audio_pcm_hw_free, |
| .prepare = audio_pcm_prepare, |
| .trigger = audio_pcm_playback_trigger, |
| .pointer = audio_pcm_pointer, |
| .mmap = audio_pcm_mmap, |
| }; |
| |
| int audio_source_bind_config(struct usb_configuration *c, |
| struct audio_source_config *config) |
| { |
| struct audio_dev *audio; |
| struct snd_card *card; |
| struct snd_pcm *pcm; |
| int err; |
| |
| config->card = -1; |
| config->device = -1; |
| |
| audio = &_audio_dev; |
| |
| err = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, |
| THIS_MODULE, 0, &card); |
| if (err) |
| return err; |
| |
| snd_card_set_dev(card, &c->cdev->gadget->dev); |
| |
| err = snd_pcm_new(card, "USB audio source", 0, 1, 0, &pcm); |
| if (err) |
| goto pcm_fail; |
| pcm->private_data = audio; |
| pcm->info_flags = 0; |
| audio->pcm = pcm; |
| |
| strlcpy(pcm->name, "USB gadget audio", sizeof(pcm->name)); |
| |
| snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &audio_playback_ops); |
| snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, |
| NULL, 0, 64 * 1024); |
| |
| strlcpy(card->driver, "audio_source", sizeof(card->driver)); |
| strlcpy(card->shortname, card->driver, sizeof(card->shortname)); |
| strlcpy(card->longname, "USB accessory audio source", |
| sizeof(card->longname)); |
| |
| err = snd_card_register(card); |
| if (err) |
| goto register_fail; |
| |
| err = usb_add_function(c, &audio->func); |
| if (err) |
| goto add_fail; |
| |
| config->card = pcm->card->number; |
| config->device = pcm->device; |
| audio->card = card; |
| return 0; |
| |
| add_fail: |
| register_fail: |
| pcm_fail: |
| snd_card_free(audio->card); |
| return err; |
| } |