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mirror_ubuntu-kernels/drivers/usb/gadget/function/f_uac1.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API)
*
* Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
* Copyright (C) 2021 Julian Scheel <julian@jusst.de>
*
* This driver doesn't expect any real Audio codec to be present
* on the device - the audio streams are simply sinked to and
* sourced from a virtual ALSA sound card created.
*
* This file is based on f_uac1.c which is
* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
* Copyright (C) 2008 Analog Devices, Inc
*/
#include <linux/usb/audio.h>
#include <linux/module.h>
#include "u_audio.h"
#include "u_uac1.h"
/* UAC1 spec: 3.7.2.3 Audio Channel Cluster Format */
#define UAC1_CHANNEL_MASK 0x0FFF
#define USB_OUT_FU_ID (out_feature_unit_desc->bUnitID)
#define USB_IN_FU_ID (in_feature_unit_desc->bUnitID)
#define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
#define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
#define FUIN_EN(_opts) ((_opts)->p_mute_present \
|| (_opts)->p_volume_present)
#define FUOUT_EN(_opts) ((_opts)->c_mute_present \
|| (_opts)->c_volume_present)
struct f_uac1 {
struct g_audio g_audio;
u8 ac_intf, as_in_intf, as_out_intf;
u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
struct usb_ctrlrequest setup_cr; /* will be used in data stage */
/* Interrupt IN endpoint of AC interface */
struct usb_ep *int_ep;
atomic_t int_count;
int ctl_id; /* EP id */
int c_srate; /* current capture srate */
int p_srate; /* current playback prate */
};
static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
{
return container_of(f, struct f_uac1, g_audio.func);
}
static inline struct f_uac1_opts *g_audio_to_uac1_opts(struct g_audio *audio)
{
return container_of(audio->func.fi, struct f_uac1_opts, func_inst);
}
/*
* DESCRIPTORS ... most are static, but strings and full
* configuration descriptors are built on demand.
*/
/*
* We have three interfaces - one AudioControl and two AudioStreaming
*
* The driver implements a simple UAC_1 topology.
* USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture
* ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
*/
/* B.3.1 Standard AC Interface Descriptor */
static struct usb_interface_descriptor ac_interface_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
/* .bNumEndpoints = DYNAMIC */
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
};
/* B.3.2 Class-Specific AC Interface Descriptor */
static struct uac1_ac_header_descriptor *ac_header_desc;
static struct uac_input_terminal_descriptor usb_out_it_desc = {
.bLength = UAC_DT_INPUT_TERMINAL_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_INPUT_TERMINAL,
/* .bTerminalID = DYNAMIC */
.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
.bAssocTerminal = 0,
.wChannelConfig = cpu_to_le16(0x3),
};
static struct uac1_output_terminal_descriptor io_out_ot_desc = {
.bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
/* .bTerminalID = DYNAMIC */
.wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
.bAssocTerminal = 0,
/* .bSourceID = DYNAMIC */
};
static struct uac_input_terminal_descriptor io_in_it_desc = {
.bLength = UAC_DT_INPUT_TERMINAL_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_INPUT_TERMINAL,
/* .bTerminalID = DYNAMIC */
.wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
.bAssocTerminal = 0,
.wChannelConfig = cpu_to_le16(0x3),
};
static struct uac1_output_terminal_descriptor usb_in_ot_desc = {
.bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
/* .bTerminalID = DYNAMIC */
.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
.bAssocTerminal = 0,
/* .bSourceID = DYNAMIC */
};
static struct uac_feature_unit_descriptor *in_feature_unit_desc;
static struct uac_feature_unit_descriptor *out_feature_unit_desc;
/* AC IN Interrupt Endpoint */
static struct usb_endpoint_descriptor ac_int_ep_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(2),
.bInterval = 4,
};
/* B.4.1 Standard AS Interface Descriptor */
static struct usb_interface_descriptor as_out_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_out_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,
};
static struct usb_interface_descriptor as_in_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_in_interface_alt_1_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 1,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
};
/* B.4.2 Class-Specific AS Interface Descriptor */
static struct uac1_as_header_descriptor as_out_header_desc = {
.bLength = UAC_DT_AS_HEADER_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_AS_GENERAL,
/* .bTerminalLink = DYNAMIC */
.bDelay = 1,
.wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
};
static struct uac1_as_header_descriptor as_in_header_desc = {
.bLength = UAC_DT_AS_HEADER_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_AS_GENERAL,
/* .bTerminalLink = DYNAMIC */
.bDelay = 1,
.wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
};
DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(UAC_MAX_RATES);
#define uac_format_type_i_discrete_descriptor \
uac_format_type_i_discrete_descriptor_##UAC_MAX_RATES
static struct uac_format_type_i_discrete_descriptor as_out_type_i_desc = {
.bLength = 0, /* filled on rate setup */
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_FORMAT_TYPE,
.bFormatType = UAC_FORMAT_TYPE_I,
.bSubframeSize = 2,
.bBitResolution = 16,
.bSamFreqType = 0, /* filled on rate setup */
};
/* Standard ISO OUT Endpoint Descriptor */
static struct usb_endpoint_descriptor as_out_ep_desc = {
.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
| USB_ENDPOINT_XFER_ISOC,
.wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
.bInterval = 4,
};
/* Class-specific AS ISO OUT Endpoint Descriptor */
static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
.bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
.bDescriptorType = USB_DT_CS_ENDPOINT,
.bDescriptorSubtype = UAC_EP_GENERAL,
.bmAttributes = 1,
.bLockDelayUnits = 1,
.wLockDelay = cpu_to_le16(1),
};
static struct uac_format_type_i_discrete_descriptor as_in_type_i_desc = {
.bLength = 0, /* filled on rate setup */
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_FORMAT_TYPE,
.bFormatType = UAC_FORMAT_TYPE_I,
.bSubframeSize = 2,
.bBitResolution = 16,
.bSamFreqType = 0, /* filled on rate setup */
};
/* Standard ISO OUT Endpoint Descriptor */
static struct usb_endpoint_descriptor as_in_ep_desc = {
.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_SYNC_ASYNC
| USB_ENDPOINT_XFER_ISOC,
.wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
.bInterval = 4,
};
/* Class-specific AS ISO OUT Endpoint Descriptor */
static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
.bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
.bDescriptorType = USB_DT_CS_ENDPOINT,
.bDescriptorSubtype = UAC_EP_GENERAL,
.bmAttributes = 1,
.bLockDelayUnits = 0,
.wLockDelay = 0,
};
static struct usb_descriptor_header *f_audio_desc[] = {
(struct usb_descriptor_header *)&ac_interface_desc,
(struct usb_descriptor_header *)&ac_header_desc,
(struct usb_descriptor_header *)&usb_out_it_desc,
(struct usb_descriptor_header *)&io_out_ot_desc,
(struct usb_descriptor_header *)&out_feature_unit_desc,
(struct usb_descriptor_header *)&io_in_it_desc,
(struct usb_descriptor_header *)&usb_in_ot_desc,
(struct usb_descriptor_header *)&in_feature_unit_desc,
(struct usb_descriptor_header *)&ac_int_ep_desc,
(struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
(struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
(struct usb_descriptor_header *)&as_out_header_desc,
(struct usb_descriptor_header *)&as_out_type_i_desc,
(struct usb_descriptor_header *)&as_out_ep_desc,
(struct usb_descriptor_header *)&as_iso_out_desc,
(struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
(struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
(struct usb_descriptor_header *)&as_in_header_desc,
(struct usb_descriptor_header *)&as_in_type_i_desc,
(struct usb_descriptor_header *)&as_in_ep_desc,
(struct usb_descriptor_header *)&as_iso_in_desc,
NULL,
};
/* Standard ISO OUT Endpoint Descriptor */
static struct usb_endpoint_descriptor ss_as_out_ep_desc = {
.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
| USB_ENDPOINT_XFER_ISOC,
.wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
.bInterval = 4,
};
static struct usb_ss_ep_comp_descriptor ss_as_out_ep_desc_comp = {
.bLength = sizeof(ss_as_out_ep_desc_comp),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 0,
.bmAttributes = 0,
/* wBytesPerInterval = DYNAMIC */
};
/* Standard ISO OUT Endpoint Descriptor */
static struct usb_endpoint_descriptor ss_as_in_ep_desc = {
.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_SYNC_ASYNC
| USB_ENDPOINT_XFER_ISOC,
.wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
.bInterval = 4,
};
static struct usb_ss_ep_comp_descriptor ss_as_in_ep_desc_comp = {
.bLength = sizeof(ss_as_in_ep_desc_comp),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 0,
.bmAttributes = 0,
/* wBytesPerInterval = DYNAMIC */
};
static struct usb_descriptor_header *f_audio_ss_desc[] = {
(struct usb_descriptor_header *)&ac_interface_desc,
(struct usb_descriptor_header *)&ac_header_desc,
(struct usb_descriptor_header *)&usb_out_it_desc,
(struct usb_descriptor_header *)&io_out_ot_desc,
(struct usb_descriptor_header *)&io_in_it_desc,
(struct usb_descriptor_header *)&usb_in_ot_desc,
(struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
(struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
(struct usb_descriptor_header *)&as_out_header_desc,
(struct usb_descriptor_header *)&as_out_type_i_desc,
//(struct usb_descriptor_header *)&as_out_ep_desc,
(struct usb_descriptor_header *)&ss_as_out_ep_desc,
(struct usb_descriptor_header *)&ss_as_out_ep_desc_comp,
(struct usb_descriptor_header *)&as_iso_out_desc,
(struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
(struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
(struct usb_descriptor_header *)&as_in_header_desc,
(struct usb_descriptor_header *)&as_in_type_i_desc,
//(struct usb_descriptor_header *)&as_in_ep_desc,
(struct usb_descriptor_header *)&ss_as_in_ep_desc,
(struct usb_descriptor_header *)&ss_as_in_ep_desc_comp,
(struct usb_descriptor_header *)&as_iso_in_desc,
NULL,
};
enum {
STR_AC_IF,
STR_USB_OUT_IT,
STR_USB_OUT_IT_CH_NAMES,
STR_IO_OUT_OT,
STR_IO_IN_IT,
STR_IO_IN_IT_CH_NAMES,
STR_USB_IN_OT,
STR_FU_IN,
STR_FU_OUT,
STR_AS_OUT_IF_ALT0,
STR_AS_OUT_IF_ALT1,
STR_AS_IN_IF_ALT0,
STR_AS_IN_IF_ALT1,
};
static struct usb_string strings_uac1[] = {
/* [STR_AC_IF].s = DYNAMIC, */
[STR_USB_OUT_IT].s = "Playback Input terminal",
[STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
[STR_IO_OUT_OT].s = "Playback Output terminal",
[STR_IO_IN_IT].s = "Capture Input terminal",
[STR_IO_IN_IT_CH_NAMES].s = "Capture Channels",
[STR_USB_IN_OT].s = "Capture Output terminal",
[STR_FU_IN].s = "Capture Volume",
[STR_FU_OUT].s = "Playback Volume",
[STR_AS_OUT_IF_ALT0].s = "Playback Inactive",
[STR_AS_OUT_IF_ALT1].s = "Playback Active",
[STR_AS_IN_IF_ALT0].s = "Capture Inactive",
[STR_AS_IN_IF_ALT1].s = "Capture Active",
{ },
};
static struct usb_gadget_strings str_uac1 = {
.language = 0x0409, /* en-us */
.strings = strings_uac1,
};
static struct usb_gadget_strings *uac1_strings[] = {
&str_uac1,
NULL,
};
/*
* This function is an ALSA sound card following USB Audio Class Spec 1.0.
*/
static void uac_cs_attr_sample_rate(struct usb_ep *ep, struct usb_request *req)
{
struct usb_function *fn = ep->driver_data;
struct usb_composite_dev *cdev = fn->config->cdev;
struct g_audio *agdev = func_to_g_audio(fn);
struct f_uac1 *uac1 = func_to_uac1(fn);
u8 *buf = (u8 *)req->buf;
u32 val = 0;
if (req->actual != 3) {
WARN(cdev, "Invalid data size for UAC_EP_CS_ATTR_SAMPLE_RATE.\n");
return;
}
val = buf[0] | (buf[1] << 8) | (buf[2] << 16);
if (uac1->ctl_id == (USB_DIR_IN | 2)) {
uac1->p_srate = val;
u_audio_set_playback_srate(agdev, uac1->p_srate);
} else if (uac1->ctl_id == (USB_DIR_OUT | 1)) {
uac1->c_srate = val;
u_audio_set_capture_srate(agdev, uac1->c_srate);
}
}
static void audio_notify_complete(struct usb_ep *_ep, struct usb_request *req)
{
struct g_audio *audio = req->context;
struct f_uac1 *uac1 = func_to_uac1(&audio->func);
atomic_dec(&uac1->int_count);
kfree(req->buf);
usb_ep_free_request(_ep, req);
}
static int audio_notify(struct g_audio *audio, int unit_id, int cs)
{
struct f_uac1 *uac1 = func_to_uac1(&audio->func);
struct usb_request *req;
struct uac1_status_word *msg;
int ret;
if (!uac1->int_ep->enabled)
return 0;
if (atomic_inc_return(&uac1->int_count) > UAC1_DEF_INT_REQ_NUM) {
atomic_dec(&uac1->int_count);
return 0;
}
req = usb_ep_alloc_request(uac1->int_ep, GFP_ATOMIC);
if (req == NULL) {
ret = -ENOMEM;
goto err_dec_int_count;
}
msg = kmalloc(sizeof(*msg), GFP_ATOMIC);
if (msg == NULL) {
ret = -ENOMEM;
goto err_free_request;
}
msg->bStatusType = UAC1_STATUS_TYPE_IRQ_PENDING
| UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF;
msg->bOriginator = unit_id;
req->length = sizeof(*msg);
req->buf = msg;
req->context = audio;
req->complete = audio_notify_complete;
ret = usb_ep_queue(uac1->int_ep, req, GFP_ATOMIC);
if (ret)
goto err_free_msg;
return 0;
err_free_msg:
kfree(msg);
err_free_request:
usb_ep_free_request(uac1->int_ep, req);
err_dec_int_count:
atomic_dec(&uac1->int_count);
return ret;
}
static int
in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
struct g_audio *audio = func_to_g_audio(fn);
struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
u16 w_value = le16_to_cpu(cr->wValue);
u8 entity_id = (w_index >> 8) & 0xff;
u8 control_selector = w_value >> 8;
int value = -EOPNOTSUPP;
if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
(FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
unsigned int is_playback = 0;
if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
is_playback = 1;
if (control_selector == UAC_FU_MUTE) {
unsigned int mute;
u_audio_get_mute(audio, is_playback, &mute);
*(u8 *)req->buf = mute;
value = min_t(unsigned int, w_length, 1);
} else if (control_selector == UAC_FU_VOLUME) {
__le16 c;
s16 volume;
u_audio_get_volume(audio, is_playback, &volume);
c = cpu_to_le16(volume);
value = min_t(unsigned int, w_length, sizeof(c));
memcpy(req->buf, &c, value);
} else {
dev_err(&audio->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
} else {
dev_err(&audio->gadget->dev,
"%s:%d entity_id=%d control_selector=%d TODO!\n",
__func__, __LINE__, entity_id, control_selector);
}
return value;
}
static int
in_rq_min(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
struct g_audio *audio = func_to_g_audio(fn);
struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
u16 w_value = le16_to_cpu(cr->wValue);
u8 entity_id = (w_index >> 8) & 0xff;
u8 control_selector = w_value >> 8;
int value = -EOPNOTSUPP;
if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
(FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
unsigned int is_playback = 0;
if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
is_playback = 1;
if (control_selector == UAC_FU_VOLUME) {
__le16 r;
s16 min_db;
if (is_playback)
min_db = opts->p_volume_min;
else
min_db = opts->c_volume_min;
r = cpu_to_le16(min_db);
value = min_t(unsigned int, w_length, sizeof(r));
memcpy(req->buf, &r, value);
} else {
dev_err(&audio->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
} else {
dev_err(&audio->gadget->dev,
"%s:%d entity_id=%d control_selector=%d TODO!\n",
__func__, __LINE__, entity_id, control_selector);
}
return value;
}
static int
in_rq_max(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
struct g_audio *audio = func_to_g_audio(fn);
struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
u16 w_value = le16_to_cpu(cr->wValue);
u8 entity_id = (w_index >> 8) & 0xff;
u8 control_selector = w_value >> 8;
int value = -EOPNOTSUPP;
if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
(FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
unsigned int is_playback = 0;
if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
is_playback = 1;
if (control_selector == UAC_FU_VOLUME) {
__le16 r;
s16 max_db;
if (is_playback)
max_db = opts->p_volume_max;
else
max_db = opts->c_volume_max;
r = cpu_to_le16(max_db);
value = min_t(unsigned int, w_length, sizeof(r));
memcpy(req->buf, &r, value);
} else {
dev_err(&audio->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
} else {
dev_err(&audio->gadget->dev,
"%s:%d entity_id=%d control_selector=%d TODO!\n",
__func__, __LINE__, entity_id, control_selector);
}
return value;
}
static int
in_rq_res(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
struct g_audio *audio = func_to_g_audio(fn);
struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
u16 w_value = le16_to_cpu(cr->wValue);
u8 entity_id = (w_index >> 8) & 0xff;
u8 control_selector = w_value >> 8;
int value = -EOPNOTSUPP;
if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
(FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
unsigned int is_playback = 0;
if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
is_playback = 1;
if (control_selector == UAC_FU_VOLUME) {
__le16 r;
s16 res_db;
if (is_playback)
res_db = opts->p_volume_res;
else
res_db = opts->c_volume_res;
r = cpu_to_le16(res_db);
value = min_t(unsigned int, w_length, sizeof(r));
memcpy(req->buf, &r, value);
} else {
dev_err(&audio->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
} else {
dev_err(&audio->gadget->dev,
"%s:%d entity_id=%d control_selector=%d TODO!\n",
__func__, __LINE__, entity_id, control_selector);
}
return value;
}
static void
out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
{
struct g_audio *audio = req->context;
struct usb_composite_dev *cdev = audio->func.config->cdev;
struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
struct f_uac1 *uac1 = func_to_uac1(&audio->func);
struct usb_ctrlrequest *cr = &uac1->setup_cr;
u16 w_index = le16_to_cpu(cr->wIndex);
u16 w_value = le16_to_cpu(cr->wValue);
u8 entity_id = (w_index >> 8) & 0xff;
u8 control_selector = w_value >> 8;
if (req->status != 0) {
dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
return;
}
if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
(FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
unsigned int is_playback = 0;
if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
is_playback = 1;
if (control_selector == UAC_FU_MUTE) {
u8 mute = *(u8 *)req->buf;
u_audio_set_mute(audio, is_playback, mute);
return;
} else if (control_selector == UAC_FU_VOLUME) {
__le16 *c = req->buf;
s16 volume;
volume = le16_to_cpu(*c);
u_audio_set_volume(audio, is_playback, volume);
return;
} else {
dev_err(&audio->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
usb_ep_set_halt(ep);
}
} else {
dev_err(&audio->gadget->dev,
"%s:%d entity_id=%d control_selector=%d TODO!\n",
__func__, __LINE__, entity_id, control_selector);
usb_ep_set_halt(ep);
}
}
static int
out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
struct g_audio *audio = func_to_g_audio(fn);
struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
struct f_uac1 *uac1 = func_to_uac1(&audio->func);
u16 w_length = le16_to_cpu(cr->wLength);
u16 w_index = le16_to_cpu(cr->wIndex);
u16 w_value = le16_to_cpu(cr->wValue);
u8 entity_id = (w_index >> 8) & 0xff;
u8 control_selector = w_value >> 8;
if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
(FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
memcpy(&uac1->setup_cr, cr, sizeof(*cr));
req->context = audio;
req->complete = out_rq_cur_complete;
return w_length;
} else {
dev_err(&audio->gadget->dev,
"%s:%d entity_id=%d control_selector=%d TODO!\n",
__func__, __LINE__, entity_id, control_selector);
}
return -EOPNOTSUPP;
}
static int ac_rq_in(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct usb_composite_dev *cdev = f->config->cdev;
int value = -EOPNOTSUPP;
u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
u16 len = le16_to_cpu(ctrl->wLength);
u16 w_value = le16_to_cpu(ctrl->wValue);
DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
ctrl->bRequest, w_value, len, ep);
switch (ctrl->bRequest) {
case UAC_GET_CUR:
return in_rq_cur(f, ctrl);
case UAC_GET_MIN:
return in_rq_min(f, ctrl);
case UAC_GET_MAX:
return in_rq_max(f, ctrl);
case UAC_GET_RES:
return in_rq_res(f, ctrl);
case UAC_GET_MEM:
break;
case UAC_GET_STAT:
value = len;
break;
default:
break;
}
return value;
}
static int audio_set_endpoint_req(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = f->config->cdev->req;
struct f_uac1 *uac1 = func_to_uac1(f);
int value = -EOPNOTSUPP;
u16 ep = le16_to_cpu(ctrl->wIndex);
u16 len = le16_to_cpu(ctrl->wLength);
u16 w_value = le16_to_cpu(ctrl->wValue);
u8 cs = w_value >> 8;
DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
ctrl->bRequest, w_value, len, ep);
switch (ctrl->bRequest) {
case UAC_SET_CUR: {
if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
cdev->gadget->ep0->driver_data = f;
uac1->ctl_id = ep;
req->complete = uac_cs_attr_sample_rate;
}
value = len;
break;
}
case UAC_SET_MIN:
break;
case UAC_SET_MAX:
break;
case UAC_SET_RES:
break;
case UAC_SET_MEM:
break;
default:
break;
}
return value;
}
static int audio_get_endpoint_req(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = f->config->cdev->req;
struct f_uac1 *uac1 = func_to_uac1(f);
u8 *buf = (u8 *)req->buf;
int value = -EOPNOTSUPP;
u8 ep = le16_to_cpu(ctrl->wIndex);
u16 len = le16_to_cpu(ctrl->wLength);
u16 w_value = le16_to_cpu(ctrl->wValue);
u8 cs = w_value >> 8;
u32 val = 0;
DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
ctrl->bRequest, w_value, len, ep);
switch (ctrl->bRequest) {
case UAC_GET_CUR: {
if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
if (ep == (USB_DIR_IN | 2))
val = uac1->p_srate;
else if (ep == (USB_DIR_OUT | 1))
val = uac1->c_srate;
buf[2] = (val >> 16) & 0xff;
buf[1] = (val >> 8) & 0xff;
buf[0] = val & 0xff;
}
value = len;
break;
}
case UAC_GET_MIN:
case UAC_GET_MAX:
case UAC_GET_RES:
value = len;
break;
case UAC_GET_MEM:
break;
default:
break;
}
return value;
}
static int
f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
{
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = cdev->req;
int value = -EOPNOTSUPP;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
u16 w_length = le16_to_cpu(ctrl->wLength);
/* composite driver infrastructure handles everything; interface
* activation uses set_alt().
*/
switch (ctrl->bRequestType) {
case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
value = audio_set_endpoint_req(f, ctrl);
break;
case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
value = audio_get_endpoint_req(f, ctrl);
break;
case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
if (ctrl->bRequest == UAC_SET_CUR)
value = out_rq_cur(f, ctrl);
break;
case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
value = ac_rq_in(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 usb_composite_dev *cdev = f->config->cdev;
struct usb_gadget *gadget = cdev->gadget;
struct device *dev = &gadget->dev;
struct g_audio *audio = func_to_g_audio(f);
struct f_uac1 *uac1 = func_to_uac1(f);
int ret = 0;
/* No i/f has more than 2 alt settings */
if (alt > 1) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return -EINVAL;
}
if (intf == uac1->ac_intf) {
/* Control I/f has only 1 AltSetting - 0 */
if (alt) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return -EINVAL;
}
/* restart interrupt endpoint */
if (uac1->int_ep) {
usb_ep_disable(uac1->int_ep);
config_ep_by_speed(gadget, &audio->func, uac1->int_ep);
usb_ep_enable(uac1->int_ep);
}
return 0;
}
if (intf == uac1->as_out_intf) {
uac1->as_out_alt = alt;
if (alt)
ret = u_audio_start_capture(&uac1->g_audio);
else
u_audio_stop_capture(&uac1->g_audio);
} else if (intf == uac1->as_in_intf) {
uac1->as_in_alt = alt;
if (alt)
ret = u_audio_start_playback(&uac1->g_audio);
else
u_audio_stop_playback(&uac1->g_audio);
} else {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return -EINVAL;
}
return ret;
}
static int f_audio_get_alt(struct usb_function *f, unsigned intf)
{
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_gadget *gadget = cdev->gadget;
struct device *dev = &gadget->dev;
struct f_uac1 *uac1 = func_to_uac1(f);
if (intf == uac1->ac_intf)
return uac1->ac_alt;
else if (intf == uac1->as_out_intf)
return uac1->as_out_alt;
else if (intf == uac1->as_in_intf)
return uac1->as_in_alt;
else
dev_err(dev, "%s:%d Invalid Interface %d!\n",
__func__, __LINE__, intf);
return -EINVAL;
}
static void f_audio_disable(struct usb_function *f)
{
struct f_uac1 *uac1 = func_to_uac1(f);
uac1->as_out_alt = 0;
uac1->as_in_alt = 0;
u_audio_stop_playback(&uac1->g_audio);
u_audio_stop_capture(&uac1->g_audio);
if (uac1->int_ep)
usb_ep_disable(uac1->int_ep);
}
static void
f_audio_suspend(struct usb_function *f)
{
struct f_uac1 *uac1 = func_to_uac1(f);
u_audio_suspend(&uac1->g_audio);
}
/*-------------------------------------------------------------------------*/
static struct uac_feature_unit_descriptor *build_fu_desc(int chmask)
{
struct uac_feature_unit_descriptor *fu_desc;
int channels = num_channels(chmask);
int fu_desc_size = UAC_DT_FEATURE_UNIT_SIZE(channels);
fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
if (!fu_desc)
return NULL;
fu_desc->bLength = fu_desc_size;
fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
fu_desc->bControlSize = 2;
/* bUnitID, bSourceID and bmaControls will be defined later */
return fu_desc;
}
/* B.3.2 Class-Specific AC Interface Descriptor */
static struct
uac1_ac_header_descriptor *build_ac_header_desc(struct f_uac1_opts *opts)
{
struct uac1_ac_header_descriptor *ac_desc;
int ac_header_desc_size;
int num_ifaces = 0;
if (EPOUT_EN(opts))
num_ifaces++;
if (EPIN_EN(opts))
num_ifaces++;
ac_header_desc_size = UAC_DT_AC_HEADER_SIZE(num_ifaces);
ac_desc = kzalloc(ac_header_desc_size, GFP_KERNEL);
if (!ac_desc)
return NULL;
ac_desc->bLength = ac_header_desc_size;
ac_desc->bDescriptorType = USB_DT_CS_INTERFACE;
ac_desc->bDescriptorSubtype = UAC_HEADER;
ac_desc->bcdADC = cpu_to_le16(0x0100);
ac_desc->bInCollection = num_ifaces;
/* wTotalLength and baInterfaceNr will be defined later */
return ac_desc;
}
/* Use macro to overcome line length limitation */
#define USBDHDR(p) (struct usb_descriptor_header *)(p)
static void setup_descriptor(struct f_uac1_opts *opts)
{
/* patch descriptors */
int i = 1; /* ID's start with 1 */
if (EPOUT_EN(opts))
usb_out_it_desc.bTerminalID = i++;
if (EPIN_EN(opts))
io_in_it_desc.bTerminalID = i++;
if (EPOUT_EN(opts))
io_out_ot_desc.bTerminalID = i++;
if (EPIN_EN(opts))
usb_in_ot_desc.bTerminalID = i++;
if (FUOUT_EN(opts))
out_feature_unit_desc->bUnitID = i++;
if (FUIN_EN(opts))
in_feature_unit_desc->bUnitID = i++;
if (FUIN_EN(opts)) {
usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
} else {
usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
}
if (FUOUT_EN(opts)) {
io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
} else {
io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
}
as_out_header_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
as_in_header_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
ac_header_desc->wTotalLength = cpu_to_le16(ac_header_desc->bLength);
if (EPIN_EN(opts)) {
u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
len += sizeof(usb_in_ot_desc);
len += sizeof(io_in_it_desc);
if (FUIN_EN(opts))
len += in_feature_unit_desc->bLength;
ac_header_desc->wTotalLength = cpu_to_le16(len);
}
if (EPOUT_EN(opts)) {
u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
len += sizeof(usb_out_it_desc);
len += sizeof(io_out_ot_desc);
if (FUOUT_EN(opts))
len += out_feature_unit_desc->bLength;
ac_header_desc->wTotalLength = cpu_to_le16(len);
}
i = 0;
f_audio_desc[i++] = USBDHDR(&ac_interface_desc);
f_audio_desc[i++] = USBDHDR(ac_header_desc);
if (EPOUT_EN(opts)) {
f_audio_desc[i++] = USBDHDR(&usb_out_it_desc);
f_audio_desc[i++] = USBDHDR(&io_out_ot_desc);
if (FUOUT_EN(opts))
f_audio_desc[i++] = USBDHDR(out_feature_unit_desc);
}
if (EPIN_EN(opts)) {
f_audio_desc[i++] = USBDHDR(&io_in_it_desc);
f_audio_desc[i++] = USBDHDR(&usb_in_ot_desc);
if (FUIN_EN(opts))
f_audio_desc[i++] = USBDHDR(in_feature_unit_desc);
}
if (FUOUT_EN(opts) || FUIN_EN(opts))
f_audio_desc[i++] = USBDHDR(&ac_int_ep_desc);
if (EPOUT_EN(opts)) {
f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_0_desc);
f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_1_desc);
f_audio_desc[i++] = USBDHDR(&as_out_header_desc);
f_audio_desc[i++] = USBDHDR(&as_out_type_i_desc);
f_audio_desc[i++] = USBDHDR(&as_out_ep_desc);
f_audio_desc[i++] = USBDHDR(&as_iso_out_desc);
}
if (EPIN_EN(opts)) {
f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_0_desc);
f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_1_desc);
f_audio_desc[i++] = USBDHDR(&as_in_header_desc);
f_audio_desc[i++] = USBDHDR(&as_in_type_i_desc);
f_audio_desc[i++] = USBDHDR(&as_in_ep_desc);
f_audio_desc[i++] = USBDHDR(&as_iso_in_desc);
}
f_audio_desc[i] = NULL;
}
static int f_audio_validate_opts(struct g_audio *audio, struct device *dev)
{
struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
if (!opts->p_chmask && !opts->c_chmask) {
dev_err(dev, "Error: no playback and capture channels\n");
return -EINVAL;
} else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) {
dev_err(dev, "Error: unsupported playback channels mask\n");
return -EINVAL;
} else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) {
dev_err(dev, "Error: unsupported capture channels mask\n");
return -EINVAL;
} else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) {
dev_err(dev, "Error: incorrect playback sample size\n");
return -EINVAL;
} else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
dev_err(dev, "Error: incorrect capture sample size\n");
return -EINVAL;
} else if (!opts->p_srates[0]) {
dev_err(dev, "Error: incorrect playback sampling rate\n");
return -EINVAL;
} else if (!opts->c_srates[0]) {
dev_err(dev, "Error: incorrect capture sampling rate\n");
return -EINVAL;
}
if (opts->p_volume_max <= opts->p_volume_min) {
dev_err(dev, "Error: incorrect playback volume max/min\n");
return -EINVAL;
} else if (opts->c_volume_max <= opts->c_volume_min) {
dev_err(dev, "Error: incorrect capture volume max/min\n");
return -EINVAL;
} else if (opts->p_volume_res <= 0) {
dev_err(dev, "Error: negative/zero playback volume resolution\n");
return -EINVAL;
} else if (opts->c_volume_res <= 0) {
dev_err(dev, "Error: negative/zero capture volume resolution\n");
return -EINVAL;
}
if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) {
dev_err(dev, "Error: incorrect playback volume resolution\n");
return -EINVAL;
} else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) {
dev_err(dev, "Error: incorrect capture volume resolution\n");
return -EINVAL;
}
return 0;
}
/* audio function driver setup/binding */
static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct usb_gadget *gadget = cdev->gadget;
struct device *dev = &gadget->dev;
struct f_uac1 *uac1 = func_to_uac1(f);
struct g_audio *audio = func_to_g_audio(f);
struct f_uac1_opts *audio_opts;
struct usb_ep *ep = NULL;
struct usb_string *us;
int ba_iface_id;
int status;
int idx, i;
status = f_audio_validate_opts(audio, dev);
if (status)
return status;
audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
strings_uac1[STR_AC_IF].s = audio_opts->function_name;
us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
if (IS_ERR(us))
return PTR_ERR(us);
ac_header_desc = build_ac_header_desc(audio_opts);
if (!ac_header_desc)
return -ENOMEM;
if (FUOUT_EN(audio_opts)) {
out_feature_unit_desc = build_fu_desc(audio_opts->c_chmask);
if (!out_feature_unit_desc) {
status = -ENOMEM;
goto fail;
}
}
if (FUIN_EN(audio_opts)) {
in_feature_unit_desc = build_fu_desc(audio_opts->p_chmask);
if (!in_feature_unit_desc) {
status = -ENOMEM;
goto err_free_fu;
}
}
ac_interface_desc.iInterface = us[STR_AC_IF].id;
usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id;
as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id;
as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id;
io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id;
io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id;
usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id;
as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id;
as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id;
if (FUOUT_EN(audio_opts)) {
u8 *i_feature;
i_feature = (u8 *)out_feature_unit_desc +
out_feature_unit_desc->bLength - 1;
*i_feature = us[STR_FU_OUT].id;
}
if (FUIN_EN(audio_opts)) {
u8 *i_feature;
i_feature = (u8 *)in_feature_unit_desc +
in_feature_unit_desc->bLength - 1;
*i_feature = us[STR_FU_IN].id;
}
/* Set channel numbers */
usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask);
usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask);
as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask);
as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize;
as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8;
io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask);
io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask);
as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask);
as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize;
as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8;
if (FUOUT_EN(audio_opts)) {
__le16 *bma = (__le16 *)&out_feature_unit_desc->bmaControls[0];
u32 control = 0;
if (audio_opts->c_mute_present)
control |= UAC_FU_MUTE;
if (audio_opts->c_volume_present)
control |= UAC_FU_VOLUME;
*bma = cpu_to_le16(control);
}
if (FUIN_EN(audio_opts)) {
__le16 *bma = (__le16 *)&in_feature_unit_desc->bmaControls[0];
u32 control = 0;
if (audio_opts->p_mute_present)
control |= UAC_FU_MUTE;
if (audio_opts->p_volume_present)
control |= UAC_FU_VOLUME;
*bma = cpu_to_le16(control);
}
/* Set sample rates */
for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) {
if (audio_opts->c_srates[i] == 0)
break;
memcpy(as_out_type_i_desc.tSamFreq[idx++],
&audio_opts->c_srates[i], 3);
}
as_out_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
as_out_type_i_desc.bSamFreqType = idx;
for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) {
if (audio_opts->p_srates[i] == 0)
break;
memcpy(as_in_type_i_desc.tSamFreq[idx++],
&audio_opts->p_srates[i], 3);
}
as_in_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
as_in_type_i_desc.bSamFreqType = idx;
uac1->p_srate = audio_opts->p_srates[0];
uac1->c_srate = audio_opts->c_srates[0];
/* allocate instance-specific interface IDs, and patch descriptors */
status = usb_interface_id(c, f);
if (status < 0)
goto err_free_fu;
ac_interface_desc.bInterfaceNumber = status;
uac1->ac_intf = status;
uac1->ac_alt = 0;
ba_iface_id = 0;
if (EPOUT_EN(audio_opts)) {
status = usb_interface_id(c, f);
if (status < 0)
goto err_free_fu;
as_out_interface_alt_0_desc.bInterfaceNumber = status;
as_out_interface_alt_1_desc.bInterfaceNumber = status;
ac_header_desc->baInterfaceNr[ba_iface_id++] = status;
uac1->as_out_intf = status;
uac1->as_out_alt = 0;
}
if (EPIN_EN(audio_opts)) {
status = usb_interface_id(c, f);
if (status < 0)
goto err_free_fu;
as_in_interface_alt_0_desc.bInterfaceNumber = status;
as_in_interface_alt_1_desc.bInterfaceNumber = status;
ac_header_desc->baInterfaceNr[ba_iface_id++] = status;
uac1->as_in_intf = status;
uac1->as_in_alt = 0;
}
audio->gadget = gadget;
status = -ENODEV;
ac_interface_desc.bNumEndpoints = 0;
/* allocate AC interrupt endpoint */
if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts)) {
ep = usb_ep_autoconfig(cdev->gadget, &ac_int_ep_desc);
if (!ep)
goto err_free_fu;
uac1->int_ep = ep;
uac1->int_ep->desc = &ac_int_ep_desc;
ac_interface_desc.bNumEndpoints = 1;
}
/* allocate instance-specific endpoints */
if (EPOUT_EN(audio_opts)) {
ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
if (!ep)
goto err_free_fu;
ss_as_out_ep_desc.bEndpointAddress = as_out_ep_desc.bEndpointAddress;
audio->out_ep = ep;
audio->out_ep->desc = &as_out_ep_desc;
}
if (EPIN_EN(audio_opts)) {
ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
if (!ep)
goto err_free_fu;
ss_as_in_ep_desc.bEndpointAddress = as_in_ep_desc.bEndpointAddress;
audio->in_ep = ep;
audio->in_ep->desc = &as_in_ep_desc;
}
setup_descriptor(audio_opts);
/* copy descriptors, and track endpoint copies */
status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, f_audio_ss_desc,
f_audio_ss_desc);
if (status)
goto err_free_fu;
audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
audio->params.c_chmask = audio_opts->c_chmask;
memcpy(audio->params.c_srates, audio_opts->c_srates,
sizeof(audio->params.c_srates));
audio->params.c_ssize = audio_opts->c_ssize;
if (FUIN_EN(audio_opts)) {
audio->params.p_fu.id = USB_IN_FU_ID;
audio->params.p_fu.mute_present = audio_opts->p_mute_present;
audio->params.p_fu.volume_present =
audio_opts->p_volume_present;
audio->params.p_fu.volume_min = audio_opts->p_volume_min;
audio->params.p_fu.volume_max = audio_opts->p_volume_max;
audio->params.p_fu.volume_res = audio_opts->p_volume_res;
}
audio->params.p_chmask = audio_opts->p_chmask;
memcpy(audio->params.p_srates, audio_opts->p_srates,
sizeof(audio->params.p_srates));
audio->params.p_ssize = audio_opts->p_ssize;
if (FUOUT_EN(audio_opts)) {
audio->params.c_fu.id = USB_OUT_FU_ID;
audio->params.c_fu.mute_present = audio_opts->c_mute_present;
audio->params.c_fu.volume_present =
audio_opts->c_volume_present;
audio->params.c_fu.volume_min = audio_opts->c_volume_min;
audio->params.c_fu.volume_max = audio_opts->c_volume_max;
audio->params.c_fu.volume_res = audio_opts->c_volume_res;
}
audio->params.req_number = audio_opts->req_number;
audio->params.fb_max = FBACK_FAST_MAX;
if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts))
audio->notify = audio_notify;
status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
if (status)
goto err_card_register;
return 0;
err_card_register:
usb_free_all_descriptors(f);
err_free_fu:
kfree(out_feature_unit_desc);
out_feature_unit_desc = NULL;
kfree(in_feature_unit_desc);
in_feature_unit_desc = NULL;
fail:
kfree(ac_header_desc);
ac_header_desc = NULL;
return status;
}
/*-------------------------------------------------------------------------*/
static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_uac1_opts,
func_inst.group);
}
static void f_uac1_attr_release(struct config_item *item)
{
struct f_uac1_opts *opts = to_f_uac1_opts(item);
usb_put_function_instance(&opts->func_inst);
}
static struct configfs_item_operations f_uac1_item_ops = {
.release = f_uac1_attr_release,
};
#define uac1_kstrtou32 kstrtou32
#define uac1_kstrtos16 kstrtos16
#define uac1_kstrtobool(s, base, res) kstrtobool((s), (res))
static const char *u32_fmt = "%u\n";
static const char *s16_fmt = "%hd\n";
static const char *bool_fmt = "%u\n";
#define UAC1_ATTRIBUTE(type, name) \
static ssize_t f_uac1_opts_##name##_show( \
struct config_item *item, \
char *page) \
{ \
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
int result; \
\
mutex_lock(&opts->lock); \
result = sprintf(page, type##_fmt, opts->name); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t f_uac1_opts_##name##_store( \
struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
int ret; \
type num; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
ret = uac1_kstrto##type(page, 0, &num); \
if (ret) \
goto end; \
\
opts->name = num; \
ret = len; \
\
end: \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
CONFIGFS_ATTR(f_uac1_opts_, name)
#define UAC1_RATE_ATTRIBUTE(name) \
static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
char *page) \
{ \
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
int result = 0; \
int i; \
\
mutex_lock(&opts->lock); \
page[0] = '\0'; \
for (i = 0; i < UAC_MAX_RATES; i++) { \
if (opts->name##s[i] == 0) \
break; \
result += sprintf(page + strlen(page), "%u,", \
opts->name##s[i]); \
} \
if (strlen(page) > 0) \
page[strlen(page) - 1] = '\n'; \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
char *split_page = NULL; \
int ret = -EINVAL; \
char *token; \
u32 num; \
int i; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
i = 0; \
memset(opts->name##s, 0x00, sizeof(opts->name##s)); \
split_page = kstrdup(page, GFP_KERNEL); \
while ((token = strsep(&split_page, ",")) != NULL) { \
ret = kstrtou32(token, 0, &num); \
if (ret) \
goto end; \
\
opts->name##s[i++] = num; \
ret = len; \
}; \
\
end: \
kfree(split_page); \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
CONFIGFS_ATTR(f_uac1_opts_, name)
#define UAC1_ATTRIBUTE_STRING(name) \
static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
char *page) \
{ \
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
int result; \
\
mutex_lock(&opts->lock); \
result = scnprintf(page, sizeof(opts->name), "%s", opts->name); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
int ret = 0; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
ret = scnprintf(opts->name, min(sizeof(opts->name), len), \
"%s", page); \
\
end: \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
CONFIGFS_ATTR(f_uac1_opts_, name)
UAC1_ATTRIBUTE(u32, c_chmask);
UAC1_RATE_ATTRIBUTE(c_srate);
UAC1_ATTRIBUTE(u32, c_ssize);
UAC1_ATTRIBUTE(u32, p_chmask);
UAC1_RATE_ATTRIBUTE(p_srate);
UAC1_ATTRIBUTE(u32, p_ssize);
UAC1_ATTRIBUTE(u32, req_number);
UAC1_ATTRIBUTE(bool, p_mute_present);
UAC1_ATTRIBUTE(bool, p_volume_present);
UAC1_ATTRIBUTE(s16, p_volume_min);
UAC1_ATTRIBUTE(s16, p_volume_max);
UAC1_ATTRIBUTE(s16, p_volume_res);
UAC1_ATTRIBUTE(bool, c_mute_present);
UAC1_ATTRIBUTE(bool, c_volume_present);
UAC1_ATTRIBUTE(s16, c_volume_min);
UAC1_ATTRIBUTE(s16, c_volume_max);
UAC1_ATTRIBUTE(s16, c_volume_res);
UAC1_ATTRIBUTE_STRING(function_name);
static struct configfs_attribute *f_uac1_attrs[] = {
&f_uac1_opts_attr_c_chmask,
&f_uac1_opts_attr_c_srate,
&f_uac1_opts_attr_c_ssize,
&f_uac1_opts_attr_p_chmask,
&f_uac1_opts_attr_p_srate,
&f_uac1_opts_attr_p_ssize,
&f_uac1_opts_attr_req_number,
&f_uac1_opts_attr_p_mute_present,
&f_uac1_opts_attr_p_volume_present,
&f_uac1_opts_attr_p_volume_min,
&f_uac1_opts_attr_p_volume_max,
&f_uac1_opts_attr_p_volume_res,
&f_uac1_opts_attr_c_mute_present,
&f_uac1_opts_attr_c_volume_present,
&f_uac1_opts_attr_c_volume_min,
&f_uac1_opts_attr_c_volume_max,
&f_uac1_opts_attr_c_volume_res,
&f_uac1_opts_attr_function_name,
NULL,
};
static const struct config_item_type f_uac1_func_type = {
.ct_item_ops = &f_uac1_item_ops,
.ct_attrs = f_uac1_attrs,
.ct_owner = THIS_MODULE,
};
static void f_audio_free_inst(struct usb_function_instance *f)
{
struct f_uac1_opts *opts;
opts = container_of(f, struct f_uac1_opts, func_inst);
kfree(opts);
}
static struct usb_function_instance *f_audio_alloc_inst(void)
{
struct f_uac1_opts *opts;
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
return ERR_PTR(-ENOMEM);
mutex_init(&opts->lock);
opts->func_inst.free_func_inst = f_audio_free_inst;
config_group_init_type_name(&opts->func_inst.group, "",
&f_uac1_func_type);
opts->c_chmask = UAC1_DEF_CCHMASK;
opts->c_srates[0] = UAC1_DEF_CSRATE;
opts->c_ssize = UAC1_DEF_CSSIZE;
opts->p_chmask = UAC1_DEF_PCHMASK;
opts->p_srates[0] = UAC1_DEF_PSRATE;
opts->p_ssize = UAC1_DEF_PSSIZE;
opts->p_mute_present = UAC1_DEF_MUTE_PRESENT;
opts->p_volume_present = UAC1_DEF_VOLUME_PRESENT;
opts->p_volume_min = UAC1_DEF_MIN_DB;
opts->p_volume_max = UAC1_DEF_MAX_DB;
opts->p_volume_res = UAC1_DEF_RES_DB;
opts->c_mute_present = UAC1_DEF_MUTE_PRESENT;
opts->c_volume_present = UAC1_DEF_VOLUME_PRESENT;
opts->c_volume_min = UAC1_DEF_MIN_DB;
opts->c_volume_max = UAC1_DEF_MAX_DB;
opts->c_volume_res = UAC1_DEF_RES_DB;
opts->req_number = UAC1_DEF_REQ_NUM;
scnprintf(opts->function_name, sizeof(opts->function_name), "AC Interface");
return &opts->func_inst;
}
static void f_audio_free(struct usb_function *f)
{
struct g_audio *audio;
struct f_uac1_opts *opts;
audio = func_to_g_audio(f);
opts = container_of(f->fi, struct f_uac1_opts, func_inst);
kfree(audio);
mutex_lock(&opts->lock);
--opts->refcnt;
mutex_unlock(&opts->lock);
}
static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct g_audio *audio = func_to_g_audio(f);
g_audio_cleanup(audio);
usb_free_all_descriptors(f);
kfree(out_feature_unit_desc);
out_feature_unit_desc = NULL;
kfree(in_feature_unit_desc);
in_feature_unit_desc = NULL;
kfree(ac_header_desc);
ac_header_desc = NULL;
audio->gadget = NULL;
}
static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
{
struct f_uac1 *uac1;
struct f_uac1_opts *opts;
/* allocate and initialize one new instance */
uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
if (!uac1)
return ERR_PTR(-ENOMEM);
opts = container_of(fi, struct f_uac1_opts, func_inst);
mutex_lock(&opts->lock);
++opts->refcnt;
mutex_unlock(&opts->lock);
uac1->g_audio.func.name = "uac1_func";
uac1->g_audio.func.bind = f_audio_bind;
uac1->g_audio.func.unbind = f_audio_unbind;
uac1->g_audio.func.set_alt = f_audio_set_alt;
uac1->g_audio.func.get_alt = f_audio_get_alt;
uac1->g_audio.func.setup = f_audio_setup;
uac1->g_audio.func.disable = f_audio_disable;
uac1->g_audio.func.suspend = f_audio_suspend;
uac1->g_audio.func.free_func = f_audio_free;
return &uac1->g_audio.func;
}
DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ruslan Bilovol");
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