315 lines
8.0 KiB
C
315 lines
8.0 KiB
C
/*
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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/module.h>
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#include <linux/usb/composite.h>
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#define DRIVER_DESC "Linux USB Audio Gadget"
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#define DRIVER_VERSION "Feb 2, 2012"
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USB_GADGET_COMPOSITE_OPTIONS();
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#ifndef CONFIG_GADGET_UAC1
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#include "u_uac2.h"
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/* Playback(USB-IN) Default Stereo - Fl/Fr */
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static int p_chmask = UAC2_DEF_PCHMASK;
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module_param(p_chmask, uint, S_IRUGO);
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MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
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/* Playback Default 48 KHz */
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static int p_srate = UAC2_DEF_PSRATE;
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module_param(p_srate, uint, S_IRUGO);
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MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
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/* Playback Default 16bits/sample */
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static int p_ssize = UAC2_DEF_PSSIZE;
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module_param(p_ssize, uint, S_IRUGO);
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MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
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/* Capture(USB-OUT) Default Stereo - Fl/Fr */
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static int c_chmask = UAC2_DEF_CCHMASK;
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module_param(c_chmask, uint, S_IRUGO);
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MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
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/* Capture Default 64 KHz */
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static int c_srate = UAC2_DEF_CSRATE;
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module_param(c_srate, uint, S_IRUGO);
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MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
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/* Capture Default 16bits/sample */
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static int c_ssize = UAC2_DEF_CSSIZE;
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module_param(c_ssize, uint, S_IRUGO);
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MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
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#else
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#include "u_uac1.h"
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static char *fn_play = FILE_PCM_PLAYBACK;
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module_param(fn_play, charp, S_IRUGO);
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MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
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static char *fn_cap = FILE_PCM_CAPTURE;
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module_param(fn_cap, charp, S_IRUGO);
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MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
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static char *fn_cntl = FILE_CONTROL;
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module_param(fn_cntl, charp, S_IRUGO);
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MODULE_PARM_DESC(fn_cntl, "Control device file name");
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static int req_buf_size = UAC1_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 = UAC1_REQ_COUNT;
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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 = UAC1_AUDIO_BUF_SIZE;
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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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#endif
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/* string IDs are assigned dynamically */
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static struct usb_string strings_dev[] = {
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[USB_GADGET_MANUFACTURER_IDX].s = "",
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[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
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[USB_GADGET_SERIAL_IDX].s = "",
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab_dev = {
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.language = 0x0409, /* en-us */
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.strings = strings_dev,
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};
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static struct usb_gadget_strings *audio_strings[] = {
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&stringtab_dev,
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NULL,
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};
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#ifndef CONFIG_GADGET_UAC1
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static struct usb_function_instance *fi_uac2;
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static struct usb_function *f_uac2;
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#else
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static struct usb_function_instance *fi_uac1;
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static struct usb_function *f_uac1;
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#endif
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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 Linux Foundation for donating this product ID. */
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#define AUDIO_VENDOR_NUM 0x1d6b /* Linux Foundation */
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#define AUDIO_PRODUCT_NUM 0x0101 /* 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 = DYNAMIC */
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#ifdef CONFIG_GADGET_UAC1
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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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#else
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.bDeviceClass = USB_CLASS_MISC,
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.bDeviceSubClass = 0x02,
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.bDeviceProtocol = 0x01,
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#endif
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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 = cpu_to_le16(AUDIO_VENDOR_NUM),
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.idProduct = 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 const struct usb_descriptor_header *otg_desc[2];
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/*-------------------------------------------------------------------------*/
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static int audio_do_config(struct usb_configuration *c)
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{
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int status;
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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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#ifdef CONFIG_GADGET_UAC1
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f_uac1 = usb_get_function(fi_uac1);
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if (IS_ERR(f_uac1)) {
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status = PTR_ERR(f_uac1);
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return status;
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}
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status = usb_add_function(c, f_uac1);
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if (status < 0) {
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usb_put_function(f_uac1);
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return status;
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}
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#else
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f_uac2 = usb_get_function(fi_uac2);
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if (IS_ERR(f_uac2)) {
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status = PTR_ERR(f_uac2);
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return status;
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}
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status = usb_add_function(c, f_uac2);
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if (status < 0) {
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usb_put_function(f_uac2);
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return status;
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}
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#endif
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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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.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 audio_bind(struct usb_composite_dev *cdev)
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{
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#ifndef CONFIG_GADGET_UAC1
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struct f_uac2_opts *uac2_opts;
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#else
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struct f_uac1_opts *uac1_opts;
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#endif
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int status;
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#ifndef CONFIG_GADGET_UAC1
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fi_uac2 = usb_get_function_instance("uac2");
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if (IS_ERR(fi_uac2))
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return PTR_ERR(fi_uac2);
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#else
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fi_uac1 = usb_get_function_instance("uac1");
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if (IS_ERR(fi_uac1))
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return PTR_ERR(fi_uac1);
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#endif
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#ifndef CONFIG_GADGET_UAC1
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uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst);
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uac2_opts->p_chmask = p_chmask;
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uac2_opts->p_srate = p_srate;
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uac2_opts->p_ssize = p_ssize;
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uac2_opts->c_chmask = c_chmask;
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uac2_opts->c_srate = c_srate;
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uac2_opts->c_ssize = c_ssize;
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#else
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uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
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uac1_opts->fn_play = fn_play;
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uac1_opts->fn_cap = fn_cap;
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uac1_opts->fn_cntl = fn_cntl;
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uac1_opts->req_buf_size = req_buf_size;
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uac1_opts->req_count = req_count;
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uac1_opts->audio_buf_size = audio_buf_size;
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#endif
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status = usb_string_ids_tab(cdev, strings_dev);
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if (status < 0)
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goto fail;
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device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
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device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
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if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
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struct usb_descriptor_header *usb_desc;
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usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
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if (!usb_desc) {
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status = -ENOMEM;
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goto fail;
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}
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usb_otg_descriptor_init(cdev->gadget, usb_desc);
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otg_desc[0] = usb_desc;
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otg_desc[1] = NULL;
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}
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status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
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if (status < 0)
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goto fail_otg_desc;
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usb_composite_overwrite_options(cdev, &coverwrite);
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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_otg_desc:
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kfree(otg_desc[0]);
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otg_desc[0] = NULL;
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fail:
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#ifndef CONFIG_GADGET_UAC1
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usb_put_function_instance(fi_uac2);
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#else
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usb_put_function_instance(fi_uac1);
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#endif
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return status;
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}
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static int audio_unbind(struct usb_composite_dev *cdev)
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{
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#ifdef CONFIG_GADGET_UAC1
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if (!IS_ERR_OR_NULL(f_uac1))
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usb_put_function(f_uac1);
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if (!IS_ERR_OR_NULL(fi_uac1))
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usb_put_function_instance(fi_uac1);
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#else
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if (!IS_ERR_OR_NULL(f_uac2))
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usb_put_function(f_uac2);
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if (!IS_ERR_OR_NULL(fi_uac2))
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usb_put_function_instance(fi_uac2);
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#endif
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kfree(otg_desc[0]);
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otg_desc[0] = NULL;
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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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.max_speed = USB_SPEED_HIGH,
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.bind = audio_bind,
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.unbind = audio_unbind,
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};
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module_usb_composite_driver(audio_driver);
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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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