USB: gadget: add USB Audio Gadget driver
Funtions added: - setup all the USB audio class device descriptors - handle class specific setup request - receive data from USB host by ISO transfer - play audio data by ALSA sound card - open and setup playback PCM interface - set default playback PCM parameters - provide playback functions for USB audio driver - provide PCM parameters set/get functions Test on: - Host: Ubuntu 8.10, kernel 2.6.27 - Gadget: EZKIT-BF548 with ASoC AD1980 codec Todo: - add real Mute control code - add real Volume control code - maybe find another way to replace dynamic buffer handling with static buffer allocation - test on Windows system - provide control interface to handle mute/volume control - provide capture interface in the future - test on BF527, other USB device controler and other audio codec Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>hifive-unleashed-5.1
Bryan Wu
Greg Kroah-Hartman
parent
c47d7b0989
commit
c6994e6f06
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@ -580,6 +580,20 @@ config USB_ZERO_HNPTEST
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the "B-Peripheral" role, that device will use HNP to let this
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one serve as the USB host instead (in the "B-Host" role).
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config USB_AUDIO
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tristate "Audio Gadget (EXPERIMENTAL)"
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depends on SND
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help
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Gadget Audio is compatible with USB Audio Class specification 1.0.
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It will include at least one AudioControl interface, zero or more
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AudioStream interface and zero or more MIDIStream interface.
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Gadget Audio will use on-board ALSA (CONFIG_SND) audio card to
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playback or capture audio stream.
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Say "y" to link the driver statically, or "m" to build a
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dynamically linked module called "g_audio".
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config USB_ETH
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tristate "Ethernet Gadget (with CDC Ethernet support)"
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depends on NET
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@ -31,6 +31,7 @@ obj-$(CONFIG_USB_S3C_HSOTG) += s3c-hsotg.o
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# USB gadget drivers
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#
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g_zero-objs := zero.o
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g_audio-objs := audio.o
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g_ether-objs := ether.o
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g_serial-objs := serial.o
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g_midi-objs := gmidi.o
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@ -40,6 +41,7 @@ g_printer-objs := printer.o
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g_cdc-objs := cdc2.o
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obj-$(CONFIG_USB_ZERO) += g_zero.o
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obj-$(CONFIG_USB_AUDIO) += g_audio.o
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obj-$(CONFIG_USB_ETH) += g_ether.o
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obj-$(CONFIG_USB_GADGETFS) += gadgetfs.o
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obj-$(CONFIG_USB_FILE_STORAGE) += g_file_storage.o
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@ -0,0 +1,302 @@
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/*
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* audio.c -- Audio gadget driver
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*
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* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
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* Copyright (C) 2008 Analog Devices, Inc
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*
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* Enter bugs at http://blackfin.uclinux.org/
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*
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* Licensed under the GPL-2 or later.
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*/
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/* #define VERBOSE_DEBUG */
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#include <linux/kernel.h>
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#include <linux/utsname.h>
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#include "u_audio.h"
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#define DRIVER_DESC "Linux USB Audio Gadget"
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#define DRIVER_VERSION "Dec 18, 2008"
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/*-------------------------------------------------------------------------*/
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/*
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* Kbuild is not very cooperative with respect to linking separately
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* compiled library objects into one module. So for now we won't use
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* separate compilation ... ensuring init/exit sections work to shrink
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* the runtime footprint, and giving us at least some parts of what
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* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
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*/
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#include "composite.c"
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#include "usbstring.c"
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#include "config.c"
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#include "epautoconf.c"
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#include "u_audio.c"
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#include "f_audio.c"
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/*-------------------------------------------------------------------------*/
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/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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/* Thanks to NetChip Technologies for donating this product ID. */
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#define AUDIO_VENDOR_NUM 0x0525 /* NetChip */
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#define AUDIO_PRODUCT_NUM 0xa4a1 /* Linux-USB Audio Gadget */
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/*-------------------------------------------------------------------------*/
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static struct usb_device_descriptor device_desc = {
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.bLength = sizeof device_desc,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = __constant_cpu_to_le16(0x200),
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.bDeviceClass = USB_CLASS_PER_INTERFACE,
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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/* .bMaxPacketSize0 = f(hardware) */
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/* Vendor and product id defaults change according to what configs
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* we support. (As does bNumConfigurations.) These values can
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* also be overridden by module parameters.
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*/
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.idVendor = __constant_cpu_to_le16(AUDIO_VENDOR_NUM),
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.idProduct = __constant_cpu_to_le16(AUDIO_PRODUCT_NUM),
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/* .bcdDevice = f(hardware) */
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/* .iManufacturer = DYNAMIC */
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/* .iProduct = DYNAMIC */
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/* NO SERIAL NUMBER */
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.bNumConfigurations = 1,
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};
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static struct usb_otg_descriptor otg_descriptor = {
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.bLength = sizeof otg_descriptor,
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.bDescriptorType = USB_DT_OTG,
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/* REVISIT SRP-only hardware is possible, although
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* it would not be called "OTG" ...
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*/
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.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
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};
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static const struct usb_descriptor_header *otg_desc[] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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/**
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* Handle USB audio endpoint set/get command in setup class request
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*/
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static int audio_set_endpoint_req(struct usb_configuration *c,
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const struct usb_ctrlrequest *ctrl)
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{
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struct usb_composite_dev *cdev = c->cdev;
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int value = -EOPNOTSUPP;
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u16 ep = le16_to_cpu(ctrl->wIndex);
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u16 len = le16_to_cpu(ctrl->wLength);
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u16 w_value = le16_to_cpu(ctrl->wValue);
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DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
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ctrl->bRequest, w_value, len, ep);
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switch (ctrl->bRequest) {
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case SET_CUR:
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value = 0;
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break;
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case SET_MIN:
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break;
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case SET_MAX:
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break;
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case SET_RES:
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break;
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case SET_MEM:
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break;
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default:
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break;
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}
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return value;
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}
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static int audio_get_endpoint_req(struct usb_configuration *c,
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const struct usb_ctrlrequest *ctrl)
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{
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struct usb_composite_dev *cdev = c->cdev;
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int value = -EOPNOTSUPP;
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u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
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u16 len = le16_to_cpu(ctrl->wLength);
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u16 w_value = le16_to_cpu(ctrl->wValue);
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DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
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ctrl->bRequest, w_value, len, ep);
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switch (ctrl->bRequest) {
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case GET_CUR:
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case GET_MIN:
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case GET_MAX:
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case GET_RES:
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value = 3;
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break;
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case GET_MEM:
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break;
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default:
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break;
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}
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return value;
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}
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static int
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audio_setup(struct usb_configuration *c, const struct usb_ctrlrequest *ctrl)
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{
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struct usb_composite_dev *cdev = c->cdev;
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struct usb_request *req = cdev->req;
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int value = -EOPNOTSUPP;
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u16 w_index = le16_to_cpu(ctrl->wIndex);
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u16 w_value = le16_to_cpu(ctrl->wValue);
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u16 w_length = le16_to_cpu(ctrl->wLength);
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/* composite driver infrastructure handles everything except
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* Audio class messages; interface activation uses set_alt().
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*/
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switch (ctrl->bRequestType) {
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case USB_AUDIO_SET_ENDPOINT:
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value = audio_set_endpoint_req(c, ctrl);
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break;
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case USB_AUDIO_GET_ENDPOINT:
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value = audio_get_endpoint_req(c, ctrl);
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break;
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default:
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ERROR(cdev, "Invalid control req%02x.%02x v%04x i%04x l%d\n",
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ctrl->bRequestType, ctrl->bRequest,
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w_value, w_index, w_length);
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}
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/* respond with data transfer or status phase? */
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if (value >= 0) {
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DBG(cdev, "Audio req%02x.%02x v%04x i%04x l%d\n",
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ctrl->bRequestType, ctrl->bRequest,
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w_value, w_index, w_length);
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req->zero = 0;
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req->length = value;
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value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
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if (value < 0)
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ERROR(cdev, "Audio response on err %d\n", value);
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}
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/* device either stalls (value < 0) or reports success */
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return value;
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}
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/*-------------------------------------------------------------------------*/
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static int __init audio_do_config(struct usb_configuration *c)
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{
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/* FIXME alloc iConfiguration string, set it in c->strings */
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if (gadget_is_otg(c->cdev->gadget)) {
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c->descriptors = otg_desc;
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c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
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}
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audio_bind_config(c);
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return 0;
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}
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static struct usb_configuration audio_config_driver = {
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.label = DRIVER_DESC,
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.bind = audio_do_config,
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.setup = audio_setup,
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.bConfigurationValue = 1,
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/* .iConfiguration = DYNAMIC */
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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};
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/*-------------------------------------------------------------------------*/
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static int __init audio_bind(struct usb_composite_dev *cdev)
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{
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int gcnum;
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int status;
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gcnum = usb_gadget_controller_number(cdev->gadget);
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if (gcnum >= 0)
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device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
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else {
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ERROR(cdev, "controller '%s' not recognized; trying %s\n",
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cdev->gadget->name,
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audio_config_driver.label);
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device_desc.bcdDevice =
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__constant_cpu_to_le16(0x0300 | 0x0099);
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}
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/* device descriptor strings: manufacturer, product */
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snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
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init_utsname()->sysname, init_utsname()->release,
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cdev->gadget->name);
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status = usb_string_id(cdev);
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if (status < 0)
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goto fail;
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strings_dev[STRING_MANUFACTURER_IDX].id = status;
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device_desc.iManufacturer = status;
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status = usb_string_id(cdev);
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if (status < 0)
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goto fail;
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strings_dev[STRING_PRODUCT_IDX].id = status;
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device_desc.iProduct = status;
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status = usb_add_config(cdev, &audio_config_driver);
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if (status < 0)
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goto fail;
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INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
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return 0;
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fail:
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return status;
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}
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static int __exit audio_unbind(struct usb_composite_dev *cdev)
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{
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return 0;
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}
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static struct usb_composite_driver audio_driver = {
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.name = "g_audio",
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.dev = &device_desc,
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.strings = audio_strings,
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.bind = audio_bind,
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.unbind = __exit_p(audio_unbind),
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};
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static int __init init(void)
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{
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return usb_composite_register(&audio_driver);
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}
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module_init(init);
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static void __exit cleanup(void)
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{
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usb_composite_unregister(&audio_driver);
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}
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module_exit(cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
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MODULE_LICENSE("GPL");
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@ -0,0 +1,707 @@
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/*
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* f_audio.c -- USB Audio class function driver
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*
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* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
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* Copyright (C) 2008 Analog Devices, Inc
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*
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* Enter bugs at http://blackfin.uclinux.org/
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <asm/atomic.h>
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#include "u_audio.h"
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#define OUT_EP_MAX_PACKET_SIZE 200
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static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
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module_param(req_buf_size, int, S_IRUGO);
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MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
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static int req_count = 256;
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module_param(req_count, int, S_IRUGO);
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MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
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static int audio_buf_size = 48000;
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module_param(audio_buf_size, int, S_IRUGO);
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MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
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/*
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* DESCRIPTORS ... most are static, but strings and full
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* configuration descriptors are built on demand.
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*/
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/*
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* We have two interfaces- AudioControl and AudioStreaming
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* TODO: only supcard playback currently
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*/
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#define F_AUDIO_AC_INTERFACE 0
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#define F_AUDIO_AS_INTERFACE 1
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#define F_AUDIO_NUM_INTERFACES 2
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/* B.3.1 Standard AC Interface Descriptor */
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static struct usb_interface_descriptor ac_interface_desc __initdata = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
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};
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DECLARE_USB_AC_HEADER_DESCRIPTOR(2);
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#define USB_DT_AC_HEADER_LENGH USB_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
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/* B.3.2 Class-Specific AC Interface Descriptor */
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static struct usb_ac_header_descriptor_2 ac_header_desc = {
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.bLength = USB_DT_AC_HEADER_LENGH,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = HEADER,
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.bcdADC = __constant_cpu_to_le16(0x0100),
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.wTotalLength = __constant_cpu_to_le16(USB_DT_AC_HEADER_LENGH),
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.bInCollection = F_AUDIO_NUM_INTERFACES,
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.baInterfaceNr = {
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[0] = F_AUDIO_AC_INTERFACE,
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[1] = F_AUDIO_AS_INTERFACE,
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}
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};
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#define INPUT_TERMINAL_ID 1
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static struct usb_input_terminal_descriptor input_terminal_desc = {
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.bLength = USB_DT_AC_INPUT_TERMINAL_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = INPUT_TERMINAL,
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.bTerminalID = INPUT_TERMINAL_ID,
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.wTerminalType = USB_AC_TERMINAL_STREAMING,
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.bAssocTerminal = 0,
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.wChannelConfig = 0x3,
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};
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DECLARE_USB_AC_FEATURE_UNIT_DESCRIPTOR(0);
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#define FEATURE_UNIT_ID 2
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static struct usb_ac_feature_unit_descriptor_0 feature_unit_desc = {
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.bLength = USB_DT_AC_FEATURE_UNIT_SIZE(0),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = FEATURE_UNIT,
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.bUnitID = FEATURE_UNIT_ID,
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.bSourceID = INPUT_TERMINAL_ID,
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.bControlSize = 2,
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.bmaControls[0] = (FU_MUTE | FU_VOLUME),
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};
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static struct usb_audio_control mute_control = {
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.list = LIST_HEAD_INIT(mute_control.list),
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.name = "Mute Control",
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.type = MUTE_CONTROL,
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/* Todo: add real Mute control code */
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.set = generic_set_cmd,
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.get = generic_get_cmd,
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};
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static struct usb_audio_control volume_control = {
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.list = LIST_HEAD_INIT(volume_control.list),
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.name = "Volume Control",
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.type = VOLUME_CONTROL,
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/* Todo: add real Volume control code */
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.set = generic_set_cmd,
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.get = generic_get_cmd,
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};
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static struct usb_audio_control_selector feature_unit = {
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.list = LIST_HEAD_INIT(feature_unit.list),
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.id = FEATURE_UNIT_ID,
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.name = "Mute & Volume Control",
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.type = FEATURE_UNIT,
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.desc = (struct usb_descriptor_header *)&feature_unit_desc,
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};
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#define OUTPUT_TERMINAL_ID 3
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static struct usb_output_terminal_descriptor output_terminal_desc = {
|
||||
.bLength = USB_DT_AC_OUTPUT_TERMINAL_SIZE,
|
||||
.bDescriptorType = USB_DT_CS_INTERFACE,
|
||||
.bDescriptorSubtype = OUTPUT_TERMINAL,
|
||||
.bTerminalID = OUTPUT_TERMINAL_ID,
|
||||
.wTerminalType = USB_AC_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 usb_as_header_descriptor as_header_desc = {
|
||||
.bLength = USB_DT_AS_HEADER_SIZE,
|
||||
.bDescriptorType = USB_DT_CS_INTERFACE,
|
||||
.bDescriptorSubtype = AS_GENERAL,
|
||||
.bTerminalLink = INPUT_TERMINAL_ID,
|
||||
.bDelay = 1,
|
||||
.wFormatTag = USB_AS_AUDIO_FORMAT_TYPE_I_PCM,
|
||||
};
|
||||
|
||||
DECLARE_USB_AS_FORMAT_TYPE_I_DISCRETE_DESC(1);
|
||||
|
||||
static struct usb_as_formate_type_i_discrete_descriptor_1 as_type_i_desc = {
|
||||
.bLength = USB_AS_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
|
||||
.bDescriptorType = USB_DT_CS_INTERFACE,
|
||||
.bDescriptorSubtype = FORMAT_TYPE,
|
||||
.bFormatType = USB_AS_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_AS_ENDPOINT_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 usb_as_iso_endpoint_descriptor as_iso_out_desc __initdata = {
|
||||
.bLength = USB_AS_ISO_ENDPOINT_DESC_SIZE,
|
||||
.bDescriptorType = USB_DT_CS_ENDPOINT,
|
||||
.bDescriptorSubtype = 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 (struct f_audio_buf *)-ENOMEM;
|
||||
|
||||
copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
|
||||
if (!copy_buf->buf) {
|
||||
kfree(copy_buf);
|
||||
return (struct f_audio_buf *)-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 (copy_buf < 0)
|
||||
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
|
||||
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 except
|
||||
* Audio class messages; interface activation uses set_alt().
|
||||
*/
|
||||
switch (ctrl->bRequestType) {
|
||||
case USB_AUDIO_SET_INTF:
|
||||
value = audio_set_intf_req(f, ctrl);
|
||||
break;
|
||||
|
||||
case USB_AUDIO_GET_INTF:
|
||||
value = audio_get_intf_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);
|
||||
|
||||
/*
|
||||
* 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);
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*/
|
||||
|
||||
/* 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[_CUR] = 0xffc0;
|
||||
volume_control.data[_MIN] = 0xe3a0;
|
||||
volume_control.data[_MAX] = 0xfff0;
|
||||
volume_control.data[_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(&audio->card);
|
||||
setup_fail:
|
||||
kfree(audio);
|
||||
return status;
|
||||
}
|
||||
|
|
@ -0,0 +1,319 @@
|
|||
/*
|
||||
* u_audio.c -- ALSA audio utilities for Gadget stack
|
||||
*
|
||||
* 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/utsname.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/ctype.h>
|
||||
#include <linux/random.h>
|
||||
#include <linux/syscalls.h>
|
||||
|
||||
#include "u_audio.h"
|
||||
|
||||
/*
|
||||
* This component encapsulates the ALSA devices for USB audio gadget
|
||||
*/
|
||||
|
||||
#define FILE_PCM_PLAYBACK "/dev/snd/pcmC0D0p"
|
||||
#define FILE_PCM_CAPTURE "/dev/snd/pcmC0D0c"
|
||||
#define FILE_CONTROL "/dev/snd/controlC0"
|
||||
|
||||
static char *fn_play = FILE_PCM_PLAYBACK;
|
||||
module_param(fn_play, charp, S_IRUGO);
|
||||
MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
|
||||
|
||||
static char *fn_cap = FILE_PCM_CAPTURE;
|
||||
module_param(fn_cap, charp, S_IRUGO);
|
||||
MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
|
||||
|
||||
static char *fn_cntl = FILE_CONTROL;
|
||||
module_param(fn_cntl, charp, S_IRUGO);
|
||||
MODULE_PARM_DESC(fn_cntl, "Control device file name");
|
||||
|
||||
/*-------------------------------------------------------------------------*/
|
||||
|
||||
/**
|
||||
* Some ALSA internal helper functions
|
||||
*/
|
||||
static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
|
||||
{
|
||||
struct snd_interval t;
|
||||
t.empty = 0;
|
||||
t.min = t.max = val;
|
||||
t.openmin = t.openmax = 0;
|
||||
t.integer = 1;
|
||||
return snd_interval_refine(i, &t);
|
||||
}
|
||||
|
||||
static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
|
||||
snd_pcm_hw_param_t var, unsigned int val,
|
||||
int dir)
|
||||
{
|
||||
int changed;
|
||||
if (hw_is_mask(var)) {
|
||||
struct snd_mask *m = hw_param_mask(params, var);
|
||||
if (val == 0 && dir < 0) {
|
||||
changed = -EINVAL;
|
||||
snd_mask_none(m);
|
||||
} else {
|
||||
if (dir > 0)
|
||||
val++;
|
||||
else if (dir < 0)
|
||||
val--;
|
||||
changed = snd_mask_refine_set(
|
||||
hw_param_mask(params, var), val);
|
||||
}
|
||||
} else if (hw_is_interval(var)) {
|
||||
struct snd_interval *i = hw_param_interval(params, var);
|
||||
if (val == 0 && dir < 0) {
|
||||
changed = -EINVAL;
|
||||
snd_interval_none(i);
|
||||
} else if (dir == 0)
|
||||
changed = snd_interval_refine_set(i, val);
|
||||
else {
|
||||
struct snd_interval t;
|
||||
t.openmin = 1;
|
||||
t.openmax = 1;
|
||||
t.empty = 0;
|
||||
t.integer = 0;
|
||||
if (dir < 0) {
|
||||
t.min = val - 1;
|
||||
t.max = val;
|
||||
} else {
|
||||
t.min = val;
|
||||
t.max = val+1;
|
||||
}
|
||||
changed = snd_interval_refine(i, &t);
|
||||
}
|
||||
} else
|
||||
return -EINVAL;
|
||||
if (changed) {
|
||||
params->cmask |= 1 << var;
|
||||
params->rmask |= 1 << var;
|
||||
}
|
||||
return changed;
|
||||
}
|
||||
/*-------------------------------------------------------------------------*/
|
||||
|
||||
/**
|
||||
* Set default hardware params
|
||||
*/
|
||||
static int playback_default_hw_params(struct gaudio_snd_dev *snd)
|
||||
{
|
||||
struct snd_pcm_substream *substream = snd->substream;
|
||||
struct snd_pcm_hw_params *params;
|
||||
snd_pcm_sframes_t result;
|
||||
|
||||
/*
|
||||
* SNDRV_PCM_ACCESS_RW_INTERLEAVED,
|
||||
* SNDRV_PCM_FORMAT_S16_LE
|
||||
* CHANNELS: 2
|
||||
* RATE: 48000
|
||||
*/
|
||||
snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
|
||||
snd->format = SNDRV_PCM_FORMAT_S16_LE;
|
||||
snd->channels = 2;
|
||||
snd->rate = 48000;
|
||||
|
||||
params = kzalloc(sizeof(*params), GFP_KERNEL);
|
||||
if (!params)
|
||||
return -ENOMEM;
|
||||
|
||||
_snd_pcm_hw_params_any(params);
|
||||
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
|
||||
snd->access, 0);
|
||||
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
|
||||
snd->format, 0);
|
||||
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
|
||||
snd->channels, 0);
|
||||
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
|
||||
snd->rate, 0);
|
||||
|
||||
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
|
||||
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, params);
|
||||
|
||||
result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
|
||||
if (result < 0) {
|
||||
ERROR(snd->card,
|
||||
"Preparing sound card failed: %d\n", (int)result);
|
||||
kfree(params);
|
||||
return result;
|
||||
}
|
||||
|
||||
/* Store the hardware parameters */
|
||||
snd->access = params_access(params);
|
||||
snd->format = params_format(params);
|
||||
snd->channels = params_channels(params);
|
||||
snd->rate = params_rate(params);
|
||||
|
||||
kfree(params);
|
||||
|
||||
INFO(snd->card,
|
||||
"Hardware params: access %x, format %x, channels %d, rate %d\n",
|
||||
snd->access, snd->format, snd->channels, snd->rate);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Playback audio buffer data by ALSA PCM device
|
||||
*/
|
||||
static size_t u_audio_playback(struct gaudio *card, void *buf, size_t count)
|
||||
{
|
||||
struct gaudio_snd_dev *snd = &card->playback;
|
||||
struct snd_pcm_substream *substream = snd->substream;
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
mm_segment_t old_fs;
|
||||
ssize_t result;
|
||||
snd_pcm_sframes_t frames;
|
||||
|
||||
try_again:
|
||||
if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
|
||||
runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
|
||||
result = snd_pcm_kernel_ioctl(substream,
|
||||
SNDRV_PCM_IOCTL_PREPARE, NULL);
|
||||
if (result < 0) {
|
||||
ERROR(card, "Preparing sound card failed: %d\n",
|
||||
(int)result);
|
||||
return result;
|
||||
}
|
||||
}
|
||||
|
||||
frames = bytes_to_frames(runtime, count);
|
||||
old_fs = get_fs();
|
||||
set_fs(KERNEL_DS);
|
||||
result = snd_pcm_lib_write(snd->substream, buf, frames);
|
||||
if (result != frames) {
|
||||
ERROR(card, "Playback error: %d\n", (int)result);
|
||||
set_fs(old_fs);
|
||||
goto try_again;
|
||||
}
|
||||
set_fs(old_fs);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int u_audio_get_playback_channels(struct gaudio *card)
|
||||
{
|
||||
return card->playback.channels;
|
||||
}
|
||||
|
||||
static int u_audio_get_playback_rate(struct gaudio *card)
|
||||
{
|
||||
return card->playback.rate;
|
||||
}
|
||||
|
||||
/**
|
||||
* Open ALSA PCM and control device files
|
||||
* Initial the PCM or control device
|
||||
*/
|
||||
static int gaudio_open_snd_dev(struct gaudio *card)
|
||||
{
|
||||
struct snd_pcm_file *pcm_file;
|
||||
struct gaudio_snd_dev *snd;
|
||||
|
||||
if (!card)
|
||||
return -ENODEV;
|
||||
|
||||
/* Open control device */
|
||||
snd = &card->control;
|
||||
snd->filp = filp_open(fn_cntl, O_RDWR, 0);
|
||||
if (IS_ERR(snd->filp)) {
|
||||
int ret = PTR_ERR(snd->filp);
|
||||
ERROR(card, "unable to open sound control device file: %s\n",
|
||||
fn_cntl);
|
||||
snd->filp = NULL;
|
||||
return ret;
|
||||
}
|
||||
snd->card = card;
|
||||
|
||||
/* Open PCM playback device and setup substream */
|
||||
snd = &card->playback;
|
||||
snd->filp = filp_open(fn_play, O_WRONLY, 0);
|
||||
if (IS_ERR(snd->filp)) {
|
||||
ERROR(card, "No such PCM playback device: %s\n", fn_play);
|
||||
snd->filp = NULL;
|
||||
}
|
||||
pcm_file = snd->filp->private_data;
|
||||
snd->substream = pcm_file->substream;
|
||||
snd->card = card;
|
||||
playback_default_hw_params(snd);
|
||||
|
||||
/* Open PCM capture device and setup substream */
|
||||
snd = &card->capture;
|
||||
snd->filp = filp_open(fn_cap, O_RDONLY, 0);
|
||||
if (IS_ERR(snd->filp)) {
|
||||
ERROR(card, "No such PCM capture device: %s\n", fn_cap);
|
||||
snd->filp = NULL;
|
||||
}
|
||||
pcm_file = snd->filp->private_data;
|
||||
snd->substream = pcm_file->substream;
|
||||
snd->card = card;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Close ALSA PCM and control device files
|
||||
*/
|
||||
static int gaudio_close_snd_dev(struct gaudio *gau)
|
||||
{
|
||||
struct gaudio_snd_dev *snd;
|
||||
|
||||
/* Close control device */
|
||||
snd = &gau->control;
|
||||
if (!IS_ERR(snd->filp))
|
||||
filp_close(snd->filp, current->files);
|
||||
|
||||
/* Close PCM playback device and setup substream */
|
||||
snd = &gau->playback;
|
||||
if (!IS_ERR(snd->filp))
|
||||
filp_close(snd->filp, current->files);
|
||||
|
||||
/* Close PCM capture device and setup substream */
|
||||
snd = &gau->capture;
|
||||
if (!IS_ERR(snd->filp))
|
||||
filp_close(snd->filp, current->files);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* gaudio_setup - setup ALSA interface and preparing for USB transfer
|
||||
*
|
||||
* This sets up PCM, mixer or MIDI ALSA devices fore USB gadget using.
|
||||
*
|
||||
* Returns negative errno, or zero on success
|
||||
*/
|
||||
int __init gaudio_setup(struct gaudio *card)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = gaudio_open_snd_dev(card);
|
||||
if (ret)
|
||||
ERROR(card, "we need at least one control device\n");
|
||||
|
||||
return ret;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* gaudio_cleanup - remove ALSA device interface
|
||||
*
|
||||
* This is called to free all resources allocated by @gaudio_setup().
|
||||
*/
|
||||
void gaudio_cleanup(struct gaudio *card)
|
||||
{
|
||||
if (card)
|
||||
gaudio_close_snd_dev(card);
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,56 @@
|
|||
/*
|
||||
* u_audio.h -- interface to USB gadget "ALSA AUDIO" utilities
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef __U_AUDIO_H
|
||||
#define __U_AUDIO_H
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/usb/audio.h>
|
||||
#include <linux/usb/composite.h>
|
||||
|
||||
#include <sound/core.h>
|
||||
#include <sound/pcm.h>
|
||||
#include <sound/pcm_params.h>
|
||||
|
||||
#include "gadget_chips.h"
|
||||
|
||||
/*
|
||||
* This represents the USB side of an audio card device, managed by a USB
|
||||
* function which provides control and stream interfaces.
|
||||
*/
|
||||
|
||||
struct gaudio_snd_dev {
|
||||
struct gaudio *card;
|
||||
struct file *filp;
|
||||
struct snd_pcm_substream *substream;
|
||||
int access;
|
||||
int format;
|
||||
int channels;
|
||||
int rate;
|
||||
};
|
||||
|
||||
struct gaudio {
|
||||
struct usb_function func;
|
||||
struct usb_gadget *gadget;
|
||||
|
||||
/* ALSA sound device interfaces */
|
||||
struct gaudio_snd_dev control;
|
||||
struct gaudio_snd_dev playback;
|
||||
struct gaudio_snd_dev capture;
|
||||
|
||||
/* TODO */
|
||||
};
|
||||
|
||||
int gaudio_setup(struct gaudio *card);
|
||||
void gaudio_cleanup(struct gaudio *card);
|
||||
|
||||
#endif /* __U_AUDIO_H */
|
||||
Loading…
Reference in New Issue