| /* |
| * f_audio.c -- USB Audio class function driver |
| * |
| * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. |
| * 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. |
| */ |
| |
| #ifdef pr_fmt |
| #undef pr_fmt |
| #endif |
| #define pr_fmt(fmt) "%s: " fmt, __func__ |
| |
| #include <linux/slab.h> |
| #include <linux/kernel.h> |
| #include <linux/device.h> |
| #include <linux/atomic.h> |
| |
| #include <sound/core.h> |
| #include <sound/initval.h> |
| |
| #include "u_uac1.h" |
| |
| /* |
| * DESCRIPTORS ... most are static, but strings and full |
| * configuration descriptors are built on demand. |
| */ |
| |
| /* |
| * We have two interfaces- AudioControl and AudioStreaming |
| */ |
| #define PLAYBACK_EP_MAX_PACKET_SIZE 32 |
| static int req_playback_buf_size = PLAYBACK_EP_MAX_PACKET_SIZE; |
| module_param(req_playback_buf_size, int, S_IRUGO); |
| MODULE_PARM_DESC(req_playback_buf_size, "ISO OUT endpoint (playback) request buffer size"); |
| |
| static int req_playback_count = 48; |
| module_param(req_playback_count, int, S_IRUGO); |
| MODULE_PARM_DESC(req_playback_count, "ISO OUT endpoint (playback) request count"); |
| |
| static int audio_playback_buf_size = 256*32; |
| module_param(audio_playback_buf_size, int, S_IRUGO); |
| MODULE_PARM_DESC(audio_playback_buf_size, "Audio buffer size"); |
| |
| #define CAPTURE_EP_MAX_PACKET_SIZE 32 |
| static int req_capture_buf_size = CAPTURE_EP_MAX_PACKET_SIZE; |
| module_param(req_capture_buf_size, int, S_IRUGO); |
| MODULE_PARM_DESC(req_capture_buf_size, "ISO IN endpoint (capture) request buffer size"); |
| |
| static int req_capture_count = 48; |
| module_param(req_capture_count, int, S_IRUGO); |
| MODULE_PARM_DESC(req_capture_count, "ISO IN endpoint (capture) request count"); |
| |
| static int audio_capture_buf_size = 256*32; |
| module_param(audio_capture_buf_size, int, S_IRUGO); |
| MODULE_PARM_DESC(audio_capture_buf_size, "Microphone 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); |
| |
| |
| #define SPEAKER_INPUT_TERMINAL_ID 3 |
| #define SPEAKER_OUTPUT_TERMINAL_ID 4 |
| |
| #define MICROPHONE_INPUT_TERMINAL_ID 1 |
| #define MICROPHONE_OUTPUT_TERMINAL_ID 2 |
| |
| |
| /* |
| * We have two interfaces- AudioControl and AudioStreaming |
| */ |
| |
| #define F_AUDIO_INTERFACE_MICROPHONE 2 |
| #define F_AUDIO_INTERFACE_SPEAKER 3 |
| #define F_AUDIO_NUM_INTERFACES 2 |
| |
| /* B.3.1 Standard AC Interface Descriptor */ |
| struct usb_interface_descriptor ac_interface_desc = { |
| .bLength = USB_DT_INTERFACE_SIZE, |
| .bDescriptorType = USB_DT_INTERFACE, |
| .bNumEndpoints = 0, |
| .bInterfaceClass = USB_CLASS_AUDIO, |
| .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, |
| }; |
| |
| #define TOTAL_LENGTH ( \ |
| UAC_DT_AC_HEADER_SIZE(2) + \ |
| UAC_DT_INPUT_TERMINAL_SIZE + \ |
| UAC_DT_OUTPUT_TERMINAL_SIZE + \ |
| UAC_DT_INPUT_TERMINAL_SIZE + \ |
| UAC_DT_OUTPUT_TERMINAL_SIZE \ |
| ) |
| |
| /* B.3.2 Class-Specific AC Interface Descriptor */ |
| struct uac1_ac_header_descriptor_2 ac_header_desc = { |
| .bLength = UAC_DT_AC_HEADER_SIZE(2), |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_HEADER, |
| .bcdADC = __constant_cpu_to_le16(0x0100), |
| .wTotalLength = __constant_cpu_to_le16(TOTAL_LENGTH), |
| .bInCollection = F_AUDIO_NUM_INTERFACES, |
| /*.baInterfaceNr = { |
| [0] = F_AUDIO_INTERFACE_MICROPHONE, |
| [1] = F_AUDIO_INTERFACE_SPEAKER, |
| } |
| */ |
| }; |
| |
| /*---------------------------------*/ |
| |
| struct uac_input_terminal_descriptor speaker_input_terminal_desc = { |
| .bLength = UAC_DT_INPUT_TERMINAL_SIZE, |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_INPUT_TERMINAL, |
| .bTerminalID = SPEAKER_INPUT_TERMINAL_ID, |
| .wTerminalType = UAC_TERMINAL_STREAMING, |
| .bAssocTerminal = SPEAKER_OUTPUT_TERMINAL_ID, |
| .wChannelConfig = 0x3, |
| }; |
| |
| struct uac1_output_terminal_descriptor speaker_output_terminal_desc = { |
| .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, |
| .bTerminalID = SPEAKER_OUTPUT_TERMINAL_ID, |
| .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER, |
| .bAssocTerminal = SPEAKER_INPUT_TERMINAL_ID, |
| .bSourceID = SPEAKER_INPUT_TERMINAL_ID, |
| }; |
| |
| static struct usb_audio_control speaker_mute_control = { |
| .list = LIST_HEAD_INIT(speaker_mute_control.list), |
| .name = "Speaker Mute Control", |
| .type = UAC_FU_MUTE, |
| /* Todo: add real Mute control code */ |
| .set = generic_set_cmd, |
| .get = generic_get_cmd, |
| }; |
| |
| static struct usb_audio_control speaker_volume_control = { |
| .list = LIST_HEAD_INIT(speaker_volume_control.list), |
| .name = "Speaker Volume Control", |
| .type = UAC_FU_VOLUME, |
| /* Todo: add real Volume control code */ |
| .set = generic_set_cmd, |
| .get = generic_get_cmd, |
| }; |
| |
| static struct usb_audio_control_selector speaker_fu_controls = { |
| .list = LIST_HEAD_INIT(speaker_fu_controls.list), |
| .name = "Speaker Function Unit Controls", |
| }; |
| |
| static struct uac_input_terminal_descriptor microphone_input_terminal_desc = { |
| .bLength = UAC_DT_INPUT_TERMINAL_SIZE, |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_INPUT_TERMINAL, |
| .bTerminalID = MICROPHONE_INPUT_TERMINAL_ID, |
| .wTerminalType = UAC_INPUT_TERMINAL_MICROPHONE, |
| .bAssocTerminal = MICROPHONE_OUTPUT_TERMINAL_ID, |
| .bNrChannels = 1, |
| .wChannelConfig = 0x3, |
| }; |
| |
| static struct |
| uac1_output_terminal_descriptor microphone_output_terminal_desc = { |
| .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, |
| .bTerminalID = MICROPHONE_OUTPUT_TERMINAL_ID, |
| .wTerminalType = UAC_TERMINAL_STREAMING, |
| .bAssocTerminal = MICROPHONE_INPUT_TERMINAL_ID, |
| .bSourceID = MICROPHONE_INPUT_TERMINAL_ID, |
| }; |
| |
| static struct usb_audio_control microphone_mute_control = { |
| .list = LIST_HEAD_INIT(microphone_mute_control.list), |
| .name = "Microphone Mute Control", |
| .type = UAC_FU_MUTE, |
| /* Todo: add real Mute control code */ |
| .set = generic_set_cmd, |
| .get = generic_get_cmd, |
| }; |
| |
| static struct usb_audio_control microphone_volume_control = { |
| .list = LIST_HEAD_INIT(microphone_volume_control.list), |
| .name = "Microphone Volume Control", |
| .type = UAC_FU_VOLUME, |
| /* Todo: add real Volume control code */ |
| .set = generic_set_cmd, |
| .get = generic_get_cmd, |
| }; |
| |
| static struct usb_audio_control_selector microphone_fu_controls = { |
| .list = LIST_HEAD_INIT(microphone_fu_controls.list), |
| .name = "Microphone Feature Unit Controls", |
| }; |
| |
| /*---------------------------------*/ |
| |
| /* B.4.1 Standard AS Interface Descriptor */ |
| static struct usb_interface_descriptor speaker_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 speaker_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 speaker_as_header_desc = { |
| .bLength = UAC_DT_AS_HEADER_SIZE, |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_AS_GENERAL, |
| .bTerminalLink = SPEAKER_INPUT_TERMINAL_ID, |
| .bDelay = 1, |
| .wFormatTag = UAC_FORMAT_TYPE_I_PCM, |
| }; |
| |
| static struct uac_format_type_i_discrete_descriptor_1 speaker_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 speaker_as_ep_out_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 = |
| __constant_cpu_to_le16(PLAYBACK_EP_MAX_PACKET_SIZE), |
| .bInterval = 4, |
| }; |
| |
| /* Class-specific AS ISO OUT Endpoint Descriptor */ |
| static struct uac_iso_endpoint_descriptor speaker_as_iso_out_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_audio_control speaker_sample_freq_control = { |
| .list = LIST_HEAD_INIT(speaker_sample_freq_control.list), |
| .name = "Speaker Sampling Frequency Control", |
| .type = UAC_EP_CS_ATTR_SAMPLE_RATE, |
| .set = generic_set_cmd, |
| .get = generic_get_cmd, |
| }; |
| |
| static struct usb_audio_control_selector speaker_as_iso_out = { |
| .list = LIST_HEAD_INIT(speaker_as_iso_out.list), |
| .name = "Speaker Iso-out Endpoint Control", |
| .type = UAC_EP_GENERAL, |
| .desc = (struct usb_descriptor_header *)&speaker_as_iso_out_desc, |
| }; |
| |
| /*---------------------------------*/ |
| |
| /* B.4.1 Standard AS Interface Descriptor */ |
| static struct usb_interface_descriptor microphone_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 microphone_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 microphone_as_header_desc = { |
| .bLength = UAC_DT_AS_HEADER_SIZE, |
| .bDescriptorType = USB_DT_CS_INTERFACE, |
| .bDescriptorSubtype = UAC_AS_GENERAL, |
| .bTerminalLink = MICROPHONE_OUTPUT_TERMINAL_ID, |
| .bDelay = 1, |
| .wFormatTag = UAC_FORMAT_TYPE_I_PCM, |
| }; |
| |
| static struct |
| uac_format_type_i_discrete_descriptor_1 microphone_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, |
| .bNrChannels = 1, |
| .bSubframeSize = 2, |
| .bBitResolution = 16, |
| .bSamFreqType = 1, |
| }; |
| |
| /* Standard ISO IN Endpoint Descriptor */ |
| static struct usb_endpoint_descriptor microphone_as_ep_in_desc = { |
| .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, |
| .bDescriptorType = USB_DT_ENDPOINT, |
| .bEndpointAddress = USB_DIR_IN, |
| .bmAttributes = |
| USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, |
| .wMaxPacketSize = |
| __constant_cpu_to_le16(CAPTURE_EP_MAX_PACKET_SIZE), |
| .bInterval = 4, |
| }; |
| |
| /* Class-specific AS ISO OUT Endpoint Descriptor */ |
| static struct uac_iso_endpoint_descriptor microphone_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_audio_control microphone_sample_freq_control = { |
| .list = LIST_HEAD_INIT(microphone_sample_freq_control.list), |
| .name = "Microphone Sampling Frequency Control", |
| .type = UAC_EP_CS_ATTR_SAMPLE_RATE, |
| .set = generic_set_cmd, |
| .get = generic_get_cmd, |
| }; |
| |
| static struct usb_audio_control_selector microphone_as_iso_in = { |
| .list = LIST_HEAD_INIT(microphone_as_iso_in.list), |
| .name = "Microphone Iso-IN Endpoint Control", |
| .type = UAC_EP_GENERAL, |
| .desc = (struct usb_descriptor_header *)µphone_as_iso_in_desc, |
| }; |
| |
| /*--------------------------------- */ |
| |
| 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 *)µphone_input_terminal_desc, |
| (struct usb_descriptor_header *)µphone_output_terminal_desc, |
| |
| (struct usb_descriptor_header *)&speaker_input_terminal_desc, |
| (struct usb_descriptor_header *)&speaker_output_terminal_desc, |
| |
| (struct usb_descriptor_header *)µphone_as_interface_alt_0_desc, |
| (struct usb_descriptor_header *)µphone_as_interface_alt_1_desc, |
| (struct usb_descriptor_header *)µphone_as_header_desc, |
| (struct usb_descriptor_header *)µphone_as_type_i_desc, |
| (struct usb_descriptor_header *)µphone_as_ep_in_desc, |
| (struct usb_descriptor_header *)µphone_as_iso_in_desc, |
| |
| (struct usb_descriptor_header *)&speaker_as_interface_alt_0_desc, |
| (struct usb_descriptor_header *)&speaker_as_interface_alt_1_desc, |
| (struct usb_descriptor_header *)&speaker_as_header_desc, |
| (struct usb_descriptor_header *)&speaker_as_type_i_desc, |
| (struct usb_descriptor_header *)&speaker_as_ep_out_desc, |
| (struct usb_descriptor_header *)&speaker_as_iso_out_desc, |
| |
| NULL, |
| }; |
| |
| /* string IDs are assigned dynamically */ |
| |
| static struct usb_string audio_string_defs[] = { |
| { } /* end of list */ |
| }; |
| |
| static struct usb_gadget_strings audio_stringtab_dev = { |
| .language = 0x0409, /* en-us */ |
| .strings = audio_string_defs, |
| }; |
| |
| static struct usb_gadget_strings *audio_strings[] = { |
| &audio_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 *playback_copy_buf; |
| |
| playback_copy_buf = kzalloc(sizeof *playback_copy_buf, GFP_ATOMIC); |
| if (!playback_copy_buf) { |
| pr_err("Failed to allocate playback_copy_buf"); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| playback_copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC); |
| if (!playback_copy_buf->buf) { |
| pr_err("Failed to allocate playback_copy_buf buffer"); |
| kfree(playback_copy_buf); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| return playback_copy_buf; |
| } |
| |
| static void f_audio_buffer_free(struct f_audio_buf *audio_buf) |
| { |
| if (audio_buf) { |
| kfree(audio_buf->buf); |
| audio_buf->buf = NULL; |
| kfree(audio_buf); |
| audio_buf = NULL; |
| } |
| } |
| /*-------------------------------------------------------------------------*/ |
| |
| struct f_audio { |
| struct gaudio card; |
| |
| /* endpoints handle full and/or high speeds */ |
| struct usb_ep *out_ep; |
| struct usb_ep *in_ep; |
| |
| spinlock_t playback_lock; |
| struct f_audio_buf *playback_copy_buf; |
| struct work_struct playback_work; |
| struct list_head play_queue; |
| |
| spinlock_t capture_lock; |
| struct f_audio_buf *capture_copy_buf; |
| struct work_struct capture_work; |
| struct list_head capture_queue; |
| struct usb_request *capture_req; |
| |
| u8 alt_intf[F_AUDIO_NUM_INTERFACES]; |
| |
| /* Control Set command */ |
| struct list_head fu_cs; |
| struct list_head ep_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; |
| unsigned long flags; |
| int res = 0; |
| |
| spin_lock_irqsave(&audio->playback_lock, flags); |
| if (list_empty(&audio->play_queue)) { |
| pr_err("playback_buf is empty"); |
| spin_unlock_irqrestore(&audio->playback_lock, flags); |
| return; |
| } |
| play_buf = list_first_entry(&audio->play_queue, |
| struct f_audio_buf, list); |
| list_del(&play_buf->list); |
| spin_unlock_irqrestore(&audio->playback_lock, flags); |
| |
| pr_debug("play_buf->actual = %d", play_buf->actual); |
| |
| res = u_audio_playback(&audio->card, play_buf->buf, play_buf->actual); |
| if (res) |
| pr_err("copying failed"); |
| |
| f_audio_buffer_free(play_buf); |
| } |
| |
| static int |
| f_audio_playback_ep_complete(struct usb_ep *ep, struct usb_request *req) |
| { |
| struct f_audio *audio = req->context; |
| struct f_audio_buf *copy_buf = audio->playback_copy_buf; |
| int err; |
| |
| if (!copy_buf) |
| return -EINVAL; |
| |
| /* Copy buffer is full, add it to the play_queue */ |
| if (audio_playback_buf_size - copy_buf->actual < req->actual) { |
| pr_debug("audio_playback_buf_size %d - copy_buf->actual %d, req->actual %d", |
| audio_playback_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_playback_buf_size); |
| if (IS_ERR(copy_buf)) { |
| pr_err("Failed to allocate playback_copy_buf"); |
| return -ENOMEM; |
| } |
| } |
| |
| memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual); |
| copy_buf->actual += req->actual; |
| audio->playback_copy_buf = copy_buf; |
| |
| err = usb_ep_queue(ep, req, GFP_ATOMIC); |
| if (err) |
| pr_err("Failed to queue %s req: err - %d\n", ep->name, err); |
| |
| return err; |
| } |
| |
| static void f_audio_capture_work(struct work_struct *data) |
| { |
| struct f_audio *audio = |
| container_of(data, struct f_audio, capture_work); |
| struct f_audio_buf *capture_buf; |
| unsigned long flags; |
| int res = 0; |
| |
| capture_buf = f_audio_buffer_alloc(audio_capture_buf_size); |
| if (capture_buf <= 0) { |
| pr_err("%s: buffer alloc failed\n", __func__); |
| return; |
| } |
| |
| res = u_audio_capture(&audio->card, capture_buf->buf, |
| audio_capture_buf_size); |
| if (res) |
| pr_err("copying failed"); |
| |
| pr_debug("Queue capture packet: size %d", audio_capture_buf_size); |
| spin_lock_irqsave(&audio->capture_lock, flags); |
| list_add_tail(&capture_buf->list, &audio->capture_queue); |
| spin_unlock_irqrestore(&audio->capture_lock, flags); |
| } |
| |
| static int |
| f_audio_capture_ep_complete(struct usb_ep *ep, struct usb_request *req) |
| { |
| struct f_audio *audio = req->context; |
| struct f_audio_buf *copy_buf = audio->capture_copy_buf; |
| unsigned long flags; |
| int err = 0; |
| |
| if (copy_buf == 0) { |
| pr_debug("copy_buf == 0"); |
| spin_lock_irqsave(&audio->capture_lock, flags); |
| if (list_empty(&audio->capture_queue)) { |
| spin_unlock_irqrestore(&audio->capture_lock, flags); |
| schedule_work(&audio->capture_work); |
| goto done; |
| } |
| copy_buf = list_first_entry(&audio->capture_queue, |
| struct f_audio_buf, list); |
| list_del(©_buf->list); |
| audio->capture_copy_buf = copy_buf; |
| spin_unlock_irqrestore(&audio->capture_lock, flags); |
| } |
| |
| pr_debug("Copy %d bytes", req->actual); |
| memcpy(req->buf, copy_buf->buf + copy_buf->actual, req->actual); |
| copy_buf->actual += req->actual; |
| |
| if (audio_capture_buf_size - copy_buf->actual < req->actual) { |
| f_audio_buffer_free(copy_buf); |
| audio->capture_copy_buf = 0; |
| schedule_work(&audio->capture_work); |
| } |
| done: |
| err = usb_ep_queue(ep, req, GFP_ATOMIC); |
| if (err) |
| pr_err("Failed to queue %s req: err - %d\n", ep->name, err); |
| |
| return err; |
| } |
| |
| 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; |
| |
| switch (status) { |
| case 0: /* normal completion? */ |
| if (ep == audio->out_ep) { |
| f_audio_playback_ep_complete(ep, req); |
| } else if (ep == audio->in_ep) { |
| f_audio_capture_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: |
| pr_err("Failed completion: status %d", status); |
| 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; |
| |
| pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", |
| ctrl->bRequest, w_value, len, id); |
| |
| list_for_each_entry(cs, &audio->fu_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; |
| |
| pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", |
| ctrl->bRequest, w_value, len, id); |
| |
| list_for_each_entry(cs, &audio->fu_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 void audio_set_endpoint_complete(struct usb_ep *ep, |
| struct usb_request *req) |
| { |
| struct f_audio *audio = req->context; |
| u32 data = 0; |
| |
| if (req->status == 0 && audio->set_con) { |
| memcpy(&data, req->buf, req->length); |
| audio->set_con->set(audio->set_con, audio->set_cmd, |
| le32_to_cpu(data)); |
| audio->set_con = NULL; |
| } |
| } |
| |
| static int audio_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); |
| |
| struct f_audio *audio = func_to_audio(f); |
| struct usb_composite_dev *cdev = f->config->cdev; |
| struct usb_request *req = cdev->req; |
| struct usb_audio_control_selector *cs; |
| struct usb_audio_control *con; |
| |
| u8 epnum = ep & ~0x80; |
| u8 con_sel = (w_value >> 8) & 0xFF; |
| u8 cmd = (ctrl->bRequest & 0x0F); |
| |
| pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, endp %d, epnum %d\n", |
| ctrl->bRequest, w_value, len, ep, epnum); |
| |
| list_for_each_entry(cs, &audio->ep_cs, list) { |
| if (cs->id != epnum) |
| continue; |
| |
| list_for_each_entry(con, &cs->control, list) { |
| if (con->type != con_sel) |
| continue; |
| |
| switch (cmd) { |
| case UAC__CUR: |
| case UAC__MIN: |
| case UAC__MAX: |
| case UAC__RES: |
| audio->set_con = con; |
| audio->set_cmd = cmd; |
| req->context = audio; |
| req->complete = audio_set_endpoint_complete; |
| value = len; |
| break; |
| case UAC__MEM: |
| break; |
| default: |
| pr_err("Unknown command"); |
| break; |
| } |
| break; |
| } |
| break; |
| } |
| |
| return value; |
| } |
| |
| static int audio_get_endpoint_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; |
| struct usb_audio_control_selector *cs; |
| struct usb_audio_control *con; |
| int data; |
| |
| int value = -EOPNOTSUPP; |
| u8 ep = (le16_to_cpu(ctrl->wIndex) & 0x7F); |
| u8 epnum = ep & ~0x80; |
| 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); |
| |
| pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, ep %d\n", |
| ctrl->bRequest, w_value, len, ep); |
| |
| list_for_each_entry(cs, &audio->ep_cs, list) { |
| if (cs->id != epnum) |
| continue; |
| |
| list_for_each_entry(con, &cs->control, list) { |
| if (con->type != con_sel) |
| continue; |
| |
| switch (cmd) { |
| case UAC__CUR: |
| case UAC__MIN: |
| case UAC__MAX: |
| case UAC__RES: |
| data = cpu_to_le32(generic_get_cmd(con, cmd)); |
| memcpy(req->buf, &data, len); |
| value = len; |
| break; |
| case UAC__MEM: |
| break; |
| default: |
| break; |
| } |
| break; |
| } |
| 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: |
| pr_debug("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: |
| pr_debug("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: |
| pr_debug("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: |
| pr_debug("USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT"); |
| value = audio_get_endpoint_req(f, ctrl); |
| break; |
| |
| default: |
| pr_err("Unknown control request %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) { |
| 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 = 1; |
| req->length = value; |
| value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); |
| if (value < 0) |
| pr_err("audio response failed on err %d\n", value); |
| } else { |
| pr_err("STALL\n"); |
| } |
| |
| /* device either stalls (value < 0) or reports success */ |
| return value; |
| } |
| |
| static int f_audio_get_alt(struct usb_function *f, unsigned intf) |
| { |
| struct f_audio *audio = func_to_audio(f); |
| |
| if (intf == ac_header_desc.baInterfaceNr[0]) |
| return audio->alt_intf[0]; |
| if (intf == ac_header_desc.baInterfaceNr[1]) |
| return audio->alt_intf[1]; |
| |
| return 0; |
| } |
| |
| static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
| { |
| struct f_audio *audio = func_to_audio(f); |
| struct usb_ep *out_ep = audio->out_ep; |
| struct usb_ep *in_ep = audio->in_ep; |
| struct usb_request *req; |
| unsigned long flags; |
| int i = 0, err = 0; |
| |
| pr_debug("intf %d, alt %d\n", intf, alt); |
| |
| if (intf == ac_header_desc.baInterfaceNr[0]) { |
| if (alt == 1) { |
| err = usb_ep_enable(in_ep); |
| if (err) { |
| pr_err("Failed to enable capture ep"); |
| return err; |
| } |
| in_ep->driver_data = audio; |
| audio->capture_copy_buf = 0; |
| |
| /* Allocate a write buffer */ |
| req = usb_ep_alloc_request(in_ep, GFP_ATOMIC); |
| if (!req) { |
| pr_err("request allocation failed\n"); |
| return -ENOMEM; |
| } |
| req->buf = kzalloc(req_capture_buf_size, |
| GFP_ATOMIC); |
| if (!req->buf) { |
| pr_err("request buffer allocation failed\n"); |
| return -ENOMEM; |
| } |
| |
| req->length = req_capture_buf_size; |
| req->context = audio; |
| req->complete = f_audio_complete; |
| audio->capture_req = req; |
| err = usb_ep_queue(in_ep, req, GFP_ATOMIC); |
| if (err) |
| pr_err("Failed to queue %s req: err %d\n", |
| in_ep->name, err); |
| schedule_work(&audio->capture_work); |
| } else { |
| struct f_audio_buf *capture_buf; |
| spin_lock_irqsave(&audio->capture_lock, flags); |
| while (!list_empty(&audio->capture_queue)) { |
| capture_buf = |
| list_first_entry( |
| &audio->capture_queue, |
| struct f_audio_buf, |
| list); |
| list_del(&capture_buf->list); |
| f_audio_buffer_free(capture_buf); |
| } |
| spin_unlock_irqrestore(&audio->capture_lock, flags); |
| } |
| audio->alt_intf[0] = alt; |
| } else if (intf == ac_header_desc.baInterfaceNr[1]) { |
| if (alt == 1) { |
| err = usb_ep_enable(out_ep); |
| if (err) { |
| pr_err("Failed to enable playback ep"); |
| return err; |
| } |
| out_ep->driver_data = audio; |
| audio->playback_copy_buf = |
| f_audio_buffer_alloc(audio_playback_buf_size); |
| if (IS_ERR(audio->playback_copy_buf)) { |
| pr_err("Failed to allocate playback_copy_buf"); |
| return -ENOMEM; |
| } |
| |
| /* |
| * allocate a bunch of read buffers |
| * and queue them all at once. |
| */ |
| for (i = 0; i < req_playback_count && err == 0; i++) { |
| req = usb_ep_alloc_request(out_ep, GFP_ATOMIC); |
| if (!req) { |
| pr_err("request allocation failed\n"); |
| return -ENOMEM; |
| } |
| req->buf = kzalloc(req_playback_buf_size, |
| GFP_ATOMIC); |
| if (!req->buf) { |
| pr_err("request buffer allocation failed\n"); |
| return -ENOMEM; |
| } |
| req->length = req_playback_buf_size; |
| req->context = audio; |
| req->complete = f_audio_complete; |
| err = usb_ep_queue(out_ep, req, GFP_ATOMIC); |
| if (err) |
| pr_err("Failed to queue %s queue req: err %d\n", |
| out_ep->name, err); |
| } |
| pr_debug("Allocated %d requests\n", req_playback_count); |
| } else { |
| struct f_audio_buf *playback_copy_buf = |
| audio->playback_copy_buf; |
| if (playback_copy_buf) { |
| pr_err("Schedule playback_work"); |
| list_add_tail(&playback_copy_buf->list, |
| &audio->play_queue); |
| schedule_work(&audio->playback_work); |
| audio->playback_copy_buf = NULL; |
| } else { |
| pr_err("playback_buf is empty. Stop."); |
| } |
| } |
| audio->alt_intf[1] = alt; |
| } else { |
| pr_err("Interface %d. Do nothing. Return %d\n", intf, err); |
| } |
| |
| return err; |
| } |
| |
| static void f_audio_disable(struct usb_function *f) |
| { |
| u_audio_clear(); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static void f_audio_build_desc(struct f_audio *audio) |
| { |
| struct gaudio *card = &audio->card; |
| u8 *sam_freq; |
| int rate; |
| |
| /* Set channel numbers */ |
| speaker_input_terminal_desc.bNrChannels = |
| u_audio_get_playback_channels(card); |
| speaker_as_type_i_desc.bNrChannels = |
| u_audio_get_playback_channels(card); |
| |
| microphone_input_terminal_desc.bNrChannels = |
| u_audio_get_capture_channels(card); |
| microphone_as_type_i_desc.bNrChannels = |
| u_audio_get_capture_channels(card); |
| |
| /* Set sample rates */ |
| rate = u_audio_get_playback_rate(card); |
| sam_freq = speaker_as_type_i_desc.tSamFreq[0]; |
| memcpy(sam_freq, &rate, 3); |
| |
| rate = u_audio_get_capture_rate(card); |
| sam_freq = microphone_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 |
| 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; |
| u8 epaddr; |
| |
| |
| f_audio_build_desc(audio); |
| |
| /* allocate instance-specific interface IDs, and patch descriptors */ |
| status = usb_interface_id(c, f); |
| if (status < 0) { |
| pr_err("%s: failed to allocate desc interface", __func__); |
| goto fail; |
| } |
| ac_interface_desc.bInterfaceNumber = status; |
| |
| status = -ENOMEM; |
| |
| status = usb_interface_id(c, f); |
| if (status < 0) { |
| pr_err("%s: failed to allocate alt interface", __func__); |
| goto fail; |
| } |
| microphone_as_interface_alt_0_desc.bInterfaceNumber = status; |
| microphone_as_interface_alt_1_desc.bInterfaceNumber = status; |
| ac_header_desc.baInterfaceNr[0] = status; |
| audio->alt_intf[0] = 0; |
| |
| status = -ENODEV; |
| |
| status = usb_interface_id(c, f); |
| if (status < 0) { |
| pr_err("%s: failed to allocate alt interface", __func__); |
| goto fail; |
| } |
| speaker_as_interface_alt_0_desc.bInterfaceNumber = status; |
| speaker_as_interface_alt_1_desc.bInterfaceNumber = status; |
| ac_header_desc.baInterfaceNr[1] = status; |
| audio->alt_intf[1] = 0; |
| |
| status = -ENODEV; |
| |
| /* allocate instance-specific endpoints */ |
| ep = usb_ep_autoconfig(cdev->gadget, µphone_as_ep_in_desc); |
| if (!ep) { |
| pr_err("%s: failed to autoconfig in endpoint", __func__); |
| goto fail; |
| } |
| audio->in_ep = ep; |
| ep->desc = µphone_as_ep_in_desc; |
| ep->driver_data = cdev; |
| |
| status = -ENOMEM; |
| |
| ep = usb_ep_autoconfig(cdev->gadget, &speaker_as_ep_out_desc); |
| if (!ep) { |
| pr_err("%s: failed to autoconfig out endpoint", __func__); |
| goto fail; |
| } |
| audio->out_ep = ep; |
| ep->desc = &speaker_as_ep_out_desc; |
| ep->driver_data = cdev; |
| |
| /* associate bEndpointAddress with usb_function */ |
| epaddr = microphone_as_ep_in_desc.bEndpointAddress & ~USB_DIR_IN; |
| microphone_as_iso_in.id = epaddr; |
| |
| epaddr = speaker_as_ep_out_desc.bEndpointAddress & ~USB_DIR_IN; |
| speaker_as_iso_out.id = epaddr; |
| |
| /* support 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); |
| usb_free_descriptors(f->hs_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 control_selector_init(struct f_audio *audio) |
| { |
| INIT_LIST_HEAD(&audio->fu_cs); |
| list_add(µphone_fu_controls.list, &audio->fu_cs); |
| list_add(&speaker_fu_controls.list, &audio->fu_cs); |
| |
| INIT_LIST_HEAD(µphone_fu_controls.control); |
| list_add(µphone_mute_control.list, |
| µphone_fu_controls.control); |
| list_add(µphone_volume_control.list, |
| µphone_fu_controls.control); |
| |
| INIT_LIST_HEAD(&speaker_fu_controls.control); |
| list_add(&speaker_mute_control.list, |
| &speaker_fu_controls.control); |
| list_add(&speaker_volume_control.list, |
| &speaker_fu_controls.control); |
| |
| microphone_volume_control.data[UAC__CUR] = 0xffc0; |
| microphone_volume_control.data[UAC__MIN] = 0xe3a0; |
| microphone_volume_control.data[UAC__MAX] = 0xfff0; |
| microphone_volume_control.data[UAC__RES] = 0x0030; |
| |
| speaker_volume_control.data[UAC__CUR] = 0xffc0; |
| speaker_volume_control.data[UAC__MIN] = 0xe3a0; |
| speaker_volume_control.data[UAC__MAX] = 0xfff0; |
| speaker_volume_control.data[UAC__RES] = 0x0030; |
| |
| INIT_LIST_HEAD(&audio->ep_cs); |
| list_add(&speaker_as_iso_out.list, &audio->ep_cs); |
| list_add(µphone_as_iso_in.list, &audio->ep_cs); |
| |
| INIT_LIST_HEAD(µphone_as_iso_in.control); |
| list_add(µphone_sample_freq_control.list, |
| µphone_as_iso_in.control); |
| |
| INIT_LIST_HEAD(&speaker_as_iso_out.control); |
| list_add(&speaker_sample_freq_control.list, |
| &speaker_as_iso_out.control); |
| |
| return 0; |
| |
| } |
| |
| /** |
| * audio_bind_config - add USB audio function to a configuration |
| * @c: the configuration to support the USB audio function |
| * Context: single threaded during gadget setup |
| * |
| * Returns zero on success, else negative errno. |
| */ |
| int 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.gadget = c->cdev->gadget; |
| |
| INIT_LIST_HEAD(&audio->play_queue); |
| spin_lock_init(&audio->playback_lock); |
| |
| INIT_LIST_HEAD(&audio->capture_queue); |
| spin_lock_init(&audio->capture_lock); |
| |
| audio->card.func.name = "audio"; |
| audio->card.func.strings = audio_strings; |
| audio->card.func.bind = f_audio_bind; |
| audio->card.func.unbind = f_audio_unbind; |
| audio->card.func.get_alt = f_audio_get_alt; |
| audio->card.func.set_alt = f_audio_set_alt; |
| audio->card.func.setup = f_audio_setup; |
| audio->card.func.disable = f_audio_disable; |
| |
| control_selector_init(audio); |
| INIT_WORK(&audio->playback_work, f_audio_playback_work); |
| INIT_WORK(&audio->capture_work, f_audio_capture_work); |
| |
| /* set up ASLA audio devices */ |
| status = gaudio_setup(&audio->card); |
| if (status < 0) |
| goto add_fail; |
| |
| status = usb_add_function(c, &audio->card.func); |
| if (status) { |
| pr_err("%s: Failed to add usb audio function, err = %d", |
| __func__, status); |
| goto setup_fail; |
| } |
| |
| return status; |
| |
| add_fail: |
| gaudio_cleanup(); |
| setup_fail: |
| kfree(audio); |
| return status; |
| } |