diff options
Diffstat (limited to 'drivers/usb/gadget/legacy/audio.c')
| -rw-r--r-- | drivers/usb/gadget/legacy/audio.c | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/drivers/usb/gadget/legacy/audio.c b/drivers/usb/gadget/legacy/audio.c new file mode 100644 index 000000000..a748ed084 --- /dev/null +++ b/drivers/usb/gadget/legacy/audio.c @@ -0,0 +1,365 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * audio.c -- Audio gadget driver + * + * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org> + * Copyright (C) 2008 Analog Devices, Inc + */ + +/* #define VERBOSE_DEBUG */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/usb/composite.h> + +#define DRIVER_DESC "Linux USB Audio Gadget" +#define DRIVER_VERSION "Feb 2, 2012" + +USB_GADGET_COMPOSITE_OPTIONS(); + +#ifndef CONFIG_GADGET_UAC1 +#include "u_uac2.h" + +/* Playback(USB-IN) Default Stereo - Fl/Fr */ +static int p_chmask = UAC2_DEF_PCHMASK; +module_param(p_chmask, uint, S_IRUGO); +MODULE_PARM_DESC(p_chmask, "Playback Channel Mask"); + +/* Playback Default 48 KHz */ +static int p_srate = UAC2_DEF_PSRATE; +module_param(p_srate, uint, S_IRUGO); +MODULE_PARM_DESC(p_srate, "Playback Sampling Rate"); + +/* Playback Default 16bits/sample */ +static int p_ssize = UAC2_DEF_PSSIZE; +module_param(p_ssize, uint, S_IRUGO); +MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)"); + +/* Capture(USB-OUT) Default Stereo - Fl/Fr */ +static int c_chmask = UAC2_DEF_CCHMASK; +module_param(c_chmask, uint, S_IRUGO); +MODULE_PARM_DESC(c_chmask, "Capture Channel Mask"); + +/* Capture Default 64 KHz */ +static int c_srate = UAC2_DEF_CSRATE; +module_param(c_srate, uint, S_IRUGO); +MODULE_PARM_DESC(c_srate, "Capture Sampling Rate"); + +/* Capture Default 16bits/sample */ +static int c_ssize = UAC2_DEF_CSSIZE; +module_param(c_ssize, uint, S_IRUGO); +MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)"); +#else +#ifndef CONFIG_GADGET_UAC1_LEGACY +#include "u_uac1.h" + +/* Playback(USB-IN) Default Stereo - Fl/Fr */ +static int p_chmask = UAC1_DEF_PCHMASK; +module_param(p_chmask, uint, S_IRUGO); +MODULE_PARM_DESC(p_chmask, "Playback Channel Mask"); + +/* Playback Default 48 KHz */ +static int p_srate = UAC1_DEF_PSRATE; +module_param(p_srate, uint, S_IRUGO); +MODULE_PARM_DESC(p_srate, "Playback Sampling Rate"); + +/* Playback Default 16bits/sample */ +static int p_ssize = UAC1_DEF_PSSIZE; +module_param(p_ssize, uint, S_IRUGO); +MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)"); + +/* Capture(USB-OUT) Default Stereo - Fl/Fr */ +static int c_chmask = UAC1_DEF_CCHMASK; +module_param(c_chmask, uint, S_IRUGO); +MODULE_PARM_DESC(c_chmask, "Capture Channel Mask"); + +/* Capture Default 48 KHz */ +static int c_srate = UAC1_DEF_CSRATE; +module_param(c_srate, uint, S_IRUGO); +MODULE_PARM_DESC(c_srate, "Capture Sampling Rate"); + +/* Capture Default 16bits/sample */ +static int c_ssize = UAC1_DEF_CSSIZE; +module_param(c_ssize, uint, S_IRUGO); +MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)"); +#else /* CONFIG_GADGET_UAC1_LEGACY */ +#include "u_uac1_legacy.h" + +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"); + +static int req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE; +module_param(req_buf_size, int, S_IRUGO); +MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size"); + +static int req_count = UAC1_REQ_COUNT; +module_param(req_count, int, S_IRUGO); +MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count"); + +static int audio_buf_size = UAC1_AUDIO_BUF_SIZE; +module_param(audio_buf_size, int, S_IRUGO); +MODULE_PARM_DESC(audio_buf_size, "Audio buffer size"); +#endif /* CONFIG_GADGET_UAC1_LEGACY */ +#endif + +/* string IDs are assigned dynamically */ + +static struct usb_string strings_dev[] = { + [USB_GADGET_MANUFACTURER_IDX].s = "", + [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC, + [USB_GADGET_SERIAL_IDX].s = "", + { } /* 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, +}; + +#ifndef CONFIG_GADGET_UAC1 +static struct usb_function_instance *fi_uac2; +static struct usb_function *f_uac2; +#else +static struct usb_function_instance *fi_uac1; +static struct usb_function *f_uac1; +#endif + +/*-------------------------------------------------------------------------*/ + +/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! + * Instead: allocate your own, using normal USB-IF procedures. + */ + +/* Thanks to Linux Foundation for donating this product ID. */ +#define AUDIO_VENDOR_NUM 0x1d6b /* Linux Foundation */ +#define AUDIO_PRODUCT_NUM 0x0101 /* Linux-USB Audio Gadget */ + +/*-------------------------------------------------------------------------*/ + +static struct usb_device_descriptor device_desc = { + .bLength = sizeof device_desc, + .bDescriptorType = USB_DT_DEVICE, + + /* .bcdUSB = DYNAMIC */ + +#ifdef CONFIG_GADGET_UAC1_LEGACY + .bDeviceClass = USB_CLASS_PER_INTERFACE, + .bDeviceSubClass = 0, + .bDeviceProtocol = 0, +#else + .bDeviceClass = USB_CLASS_MISC, + .bDeviceSubClass = 0x02, + .bDeviceProtocol = 0x01, +#endif + /* .bMaxPacketSize0 = f(hardware) */ + + /* Vendor and product id defaults change according to what configs + * we support. (As does bNumConfigurations.) These values can + * also be overridden by module parameters. + */ + .idVendor = cpu_to_le16(AUDIO_VENDOR_NUM), + .idProduct = cpu_to_le16(AUDIO_PRODUCT_NUM), + /* .bcdDevice = f(hardware) */ + /* .iManufacturer = DYNAMIC */ + /* .iProduct = DYNAMIC */ + /* NO SERIAL NUMBER */ + .bNumConfigurations = 1, +}; + +static const struct usb_descriptor_header *otg_desc[2]; + +/*-------------------------------------------------------------------------*/ + +static int audio_do_config(struct usb_configuration *c) +{ + int status; + + /* FIXME alloc iConfiguration string, set it in c->strings */ + + if (gadget_is_otg(c->cdev->gadget)) { + c->descriptors = otg_desc; + c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; + } + +#ifdef CONFIG_GADGET_UAC1 + f_uac1 = usb_get_function(fi_uac1); + if (IS_ERR(f_uac1)) { + status = PTR_ERR(f_uac1); + return status; + } + + status = usb_add_function(c, f_uac1); + if (status < 0) { + usb_put_function(f_uac1); + return status; + } +#else + f_uac2 = usb_get_function(fi_uac2); + if (IS_ERR(f_uac2)) { + status = PTR_ERR(f_uac2); + return status; + } + + status = usb_add_function(c, f_uac2); + if (status < 0) { + usb_put_function(f_uac2); + return status; + } +#endif + + return 0; +} + +static struct usb_configuration audio_config_driver = { + .label = DRIVER_DESC, + .bConfigurationValue = 1, + /* .iConfiguration = DYNAMIC */ + .bmAttributes = USB_CONFIG_ATT_SELFPOWER, +}; + +/*-------------------------------------------------------------------------*/ + +static int audio_bind(struct usb_composite_dev *cdev) +{ +#ifndef CONFIG_GADGET_UAC1 + struct f_uac2_opts *uac2_opts; +#else +#ifndef CONFIG_GADGET_UAC1_LEGACY + struct f_uac1_opts *uac1_opts; +#else + struct f_uac1_legacy_opts *uac1_opts; +#endif +#endif + int status; + +#ifndef CONFIG_GADGET_UAC1 + fi_uac2 = usb_get_function_instance("uac2"); + if (IS_ERR(fi_uac2)) + return PTR_ERR(fi_uac2); +#else +#ifndef CONFIG_GADGET_UAC1_LEGACY + fi_uac1 = usb_get_function_instance("uac1"); +#else + fi_uac1 = usb_get_function_instance("uac1_legacy"); +#endif + if (IS_ERR(fi_uac1)) + return PTR_ERR(fi_uac1); +#endif + +#ifndef CONFIG_GADGET_UAC1 + uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst); + uac2_opts->p_chmask = p_chmask; + uac2_opts->p_srate = p_srate; + uac2_opts->p_ssize = p_ssize; + uac2_opts->c_chmask = c_chmask; + uac2_opts->c_srate = c_srate; + uac2_opts->c_ssize = c_ssize; + uac2_opts->req_number = UAC2_DEF_REQ_NUM; +#else +#ifndef CONFIG_GADGET_UAC1_LEGACY + uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst); + uac1_opts->p_chmask = p_chmask; + uac1_opts->p_srate = p_srate; + uac1_opts->p_ssize = p_ssize; + uac1_opts->c_chmask = c_chmask; + uac1_opts->c_srate = c_srate; + uac1_opts->c_ssize = c_ssize; + uac1_opts->req_number = UAC1_DEF_REQ_NUM; +#else /* CONFIG_GADGET_UAC1_LEGACY */ + uac1_opts = container_of(fi_uac1, struct f_uac1_legacy_opts, func_inst); + uac1_opts->fn_play = fn_play; + uac1_opts->fn_cap = fn_cap; + uac1_opts->fn_cntl = fn_cntl; + uac1_opts->req_buf_size = req_buf_size; + uac1_opts->req_count = req_count; + uac1_opts->audio_buf_size = audio_buf_size; +#endif /* CONFIG_GADGET_UAC1_LEGACY */ +#endif + + status = usb_string_ids_tab(cdev, strings_dev); + if (status < 0) + goto fail; + device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id; + device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id; + + if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) { + struct usb_descriptor_header *usb_desc; + + usb_desc = usb_otg_descriptor_alloc(cdev->gadget); + if (!usb_desc) { + status = -ENOMEM; + goto fail; + } + usb_otg_descriptor_init(cdev->gadget, usb_desc); + otg_desc[0] = usb_desc; + otg_desc[1] = NULL; + } + + status = usb_add_config(cdev, &audio_config_driver, audio_do_config); + if (status < 0) + goto fail_otg_desc; + usb_composite_overwrite_options(cdev, &coverwrite); + + INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION); + return 0; + +fail_otg_desc: + kfree(otg_desc[0]); + otg_desc[0] = NULL; +fail: +#ifndef CONFIG_GADGET_UAC1 + usb_put_function_instance(fi_uac2); +#else + usb_put_function_instance(fi_uac1); +#endif + return status; +} + +static int audio_unbind(struct usb_composite_dev *cdev) +{ +#ifdef CONFIG_GADGET_UAC1 + if (!IS_ERR_OR_NULL(f_uac1)) + usb_put_function(f_uac1); + if (!IS_ERR_OR_NULL(fi_uac1)) + usb_put_function_instance(fi_uac1); +#else + if (!IS_ERR_OR_NULL(f_uac2)) + usb_put_function(f_uac2); + if (!IS_ERR_OR_NULL(fi_uac2)) + usb_put_function_instance(fi_uac2); +#endif + kfree(otg_desc[0]); + otg_desc[0] = NULL; + + return 0; +} + +static struct usb_composite_driver audio_driver = { + .name = "g_audio", + .dev = &device_desc, + .strings = audio_strings, + .max_speed = USB_SPEED_HIGH, + .bind = audio_bind, + .unbind = audio_unbind, +}; + +module_usb_composite_driver(audio_driver); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>"); +MODULE_LICENSE("GPL"); + |