// SPDX-License-Identifier: GPL-2.0+
/*
* f_uac2.c -- USB Audio Class 2.0 Function
*
* Copyright (C) 2011
* Yadwinder Singh ([email protected])
* Jaswinder Singh ([email protected])
*
* Copyright (C) 2020
* Ruslan Bilovol ([email protected])
*/
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
#include <linux/module.h>
#include "u_audio.h"
#include "u_uac2.h"
/* UAC2 spec: 4.1 Audio Channel Cluster Descriptor */
#define UAC2_CHANNEL_MASK 0x07FFFFFF
/*
* The driver implements a simple UAC_2 topology.
* USB-OUT -> IT_1 -> FU -> OT_3 -> ALSA_Capture
* ALSA_Playback -> IT_2 -> FU -> OT_4 -> USB-IN
* Capture and Playback sampling rates are independently
* controlled by two clock sources :
* CLK_5 := c_srate, and CLK_6 := p_srate
*/
#define USB_OUT_CLK_ID (out_clk_src_desc.bClockID)
#define USB_IN_CLK_ID (in_clk_src_desc.bClockID)
#define USB_OUT_FU_ID (out_feature_unit_desc->bUnitID)
#define USB_IN_FU_ID (in_feature_unit_desc->bUnitID)
#define CONTROL_ABSENT 0
#define CONTROL_RDONLY 1
#define CONTROL_RDWR 3
#define CLK_FREQ_CTRL 0
#define CLK_VLD_CTRL 2
#define FU_MUTE_CTRL 0
#define FU_VOL_CTRL 2
#define COPY_CTRL 0
#define CONN_CTRL 2
#define OVRLD_CTRL 4
#define CLSTR_CTRL 6
#define UNFLW_CTRL 8
#define OVFLW_CTRL 10
#define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
#define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
#define FUIN_EN(_opts) (EPIN_EN(_opts) \
&& ((_opts)->p_mute_present \
|| (_opts)->p_volume_present))
#define FUOUT_EN(_opts) (EPOUT_EN(_opts) \
&& ((_opts)->c_mute_present \
|| (_opts)->c_volume_present))
#define EPOUT_FBACK_IN_EN(_opts) ((_opts)->c_sync == USB_ENDPOINT_SYNC_ASYNC)
struct f_uac2 {
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;
/* transient state, only valid during handling of a single control request */
int clock_id;
};
static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
{
return container_of(f, struct f_uac2, g_audio.func);
}
static inline
struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
{
return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
}
static int afunc_notify(struct g_audio *agdev, int unit_id, int cs);
/* --------- USB Function Interface ------------- */
enum {
STR_ASSOC,
STR_IF_CTRL,
STR_CLKSRC_IN,
STR_CLKSRC_OUT,
STR_USB_IT,
STR_USB_IT_CH,
STR_IO_IT,
STR_IO_IT_CH,
STR_USB_OT,
STR_IO_OT,
STR_FU_IN,
STR_FU_OUT,
STR_AS_OUT_ALT0,
STR_AS_OUT_ALT1,
STR_AS_IN_ALT0,
STR_AS_IN_ALT1,
NUM_STR_DESCRIPTORS,
};
static struct usb_string strings_fn[NUM_STR_DESCRIPTORS + 1] = {};
static const char *const speed_names[] = {
[USB_SPEED_UNKNOWN] = "UNKNOWN",
[USB_SPEED_LOW] = "LS",
[USB_SPEED_FULL] = "FS",
[USB_SPEED_HIGH] = "HS",
[USB_SPEED_WIRELESS] = "W",
[USB_SPEED_SUPER] = "SS",
[USB_SPEED_SUPER_PLUS] = "SS+",
};
static struct usb_gadget_strings str_fn = {
.language = 0x0409, /* en-us */
.strings = strings_fn,
};
static struct usb_gadget_strings *fn_strings[] = {
&str_fn,
NULL,
};
static struct usb_interface_assoc_descriptor iad_desc = {
.bLength = sizeof iad_desc,
.bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
.bFirstInterface = 0,
.bInterfaceCount = 3,
.bFunctionClass = USB_CLASS_AUDIO,
.bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
.bFunctionProtocol = UAC_VERSION_2,
};
/* Audio Control Interface */
static struct usb_interface_descriptor std_ac_if_desc = {
.bLength = sizeof std_ac_if_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 0,
/* .bNumEndpoints = DYNAMIC */
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
.bInterfaceProtocol = UAC_VERSION_2,
};
/* Clock source for IN traffic */
static struct uac_clock_source_descriptor in_clk_src_desc = {
.bLength = sizeof in_clk_src_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC2_CLOCK_SOURCE,
/* .bClockID = DYNAMIC */
.bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
.bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL),
.bAssocTerminal = 0,
};
/* Clock source for OUT traffic */
static struct uac_clock_source_descriptor out_clk_src_desc = {
.bLength = sizeof out_clk_src_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC2_CLOCK_SOURCE,
/* .bClockID = DYNAMIC */
.bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
.bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL),
.bAssocTerminal = 0,
};
/* Input Terminal for USB_OUT */
static struct uac2_input_terminal_descriptor usb_out_it_desc = {
.bLength = sizeof usb_out_it_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_INPUT_TERMINAL,
/* .bTerminalID = DYNAMIC */
.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
.bAssocTerminal = 0,
/* .bCSourceID = DYNAMIC */
.iChannelNames = 0,
.bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
};
/* Input Terminal for I/O-In */
static struct uac2_input_terminal_descriptor io_in_it_desc = {
.bLength = sizeof io_in_it_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_INPUT_TERMINAL,
/* .bTerminalID = DYNAMIC */
/* .wTerminalType = DYNAMIC */
.bAssocTerminal = 0,
/* .bCSourceID = DYNAMIC */
.iChannelNames = 0,
.bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
};
/* Ouput Terminal for USB_IN */
static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
.bLength = sizeof usb_in_ot_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
/* .bTerminalID = DYNAMIC */
.wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
.bAssocTerminal = 0,
/* .bSourceID = DYNAMIC */
/* .bCSourceID = DYNAMIC */
.bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
};
/* Ouput Terminal for I/O-Out */
static struct uac2_output_terminal_descriptor io_out_ot_desc = {
.bLength = sizeof io_out_ot_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
/* .bTerminalID = DYNAMIC */
/* .wTerminalType = DYNAMIC */
.bAssocTerminal = 0,
/* .bSourceID = DYNAMIC */
/* .bCSourceID = DYNAMIC */
.bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
};
static struct uac2_feature_unit_descriptor *in_feature_unit_desc;
static struct uac2_feature_unit_descriptor *out_feature_unit_desc;
static struct uac2_ac_header_descriptor ac_hdr_desc = {
.bLength = sizeof ac_hdr_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_MS_HEADER,
.bcdADC = cpu_to_le16(0x200),
.bCategory = UAC2_FUNCTION_IO_BOX,
/* .wTotalLength = DYNAMIC */
.bmControls = 0,
};
/* AC IN Interrupt Endpoint */
static struct usb_endpoint_descriptor fs_ep_int_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(6),
.bInterval = 1,
};
static struct usb_endpoint_descriptor hs_ep_int_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(6),
.bInterval = 4,
};
static struct usb_endpoint_descriptor ss_ep_int_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(6),
.bInterval = 4,
};
static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = {
.bLength = sizeof(ss_ep_int_desc_comp),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.wBytesPerInterval = cpu_to_le16(6),
};
/* Audio Streaming OUT Interface - Alt0 */
static struct usb_interface_descriptor std_as_out_if0_desc = {
.bLength = sizeof std_as_out_if0_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
.bInterfaceProtocol = UAC_VERSION_2,
};
/* Audio Streaming OUT Interface - Alt1 */
static struct usb_interface_descriptor std_as_out_if1_desc = {
.bLength = sizeof std_as_out_if1_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 1,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
.bInterfaceProtocol = UAC_VERSION_2,
};
/* Audio Stream OUT Intface Desc */
static struct uac2_as_header_descriptor as_out_hdr_desc = {
.bLength = sizeof as_out_hdr_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_AS_GENERAL,
/* .bTerminalLink = DYNAMIC */
.bmControls = 0,
.bFormatType = UAC_FORMAT_TYPE_I,
.bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
.iChannelNames = 0,
};
/* Audio USB_OUT Format */
static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
.bLength = sizeof as_out_fmt1_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_FORMAT_TYPE,
.bFormatType = UAC_FORMAT_TYPE_I,
};
/* STD AS ISO OUT Endpoint */
static struct usb_endpoint_descriptor fs_epout_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
/* .bmAttributes = DYNAMIC */
/* .wMaxPacketSize = DYNAMIC */
.bInterval = 1,
};
static struct usb_endpoint_descriptor hs_epout_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
/* .bmAttributes = DYNAMIC */
/* .wMaxPacketSize = DYNAMIC */
/* .bInterval = DYNAMIC */
};
static struct usb_endpoint_descriptor ss_epout_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
/* .bmAttributes = DYNAMIC */
/* .wMaxPacketSize = DYNAMIC */
/* .bInterval = DYNAMIC */
};
static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = {
.bLength = sizeof(ss_epout_desc_comp),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 0,
.bmAttributes = 0,
/* wBytesPerInterval = DYNAMIC */
};
/* CS AS ISO OUT Endpoint */
static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
.bLength = sizeof as_iso_out_desc,
.bDescriptorType = USB_DT_CS_ENDPOINT,
.bDescriptorSubtype = UAC_EP_GENERAL,
.bmAttributes = 0,
.bmControls = 0,
.bLockDelayUnits = 0,
.wLockDelay = 0,
};
/* STD AS ISO IN Feedback Endpoint */
static struct usb_endpoint_descriptor fs_epin_fback_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
.wMaxPacketSize = cpu_to_le16(3),
.bInterval = 1,
};
static struct usb_endpoint_descriptor hs_epin_fback_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
.wMaxPacketSize = cpu_to_le16(4),
.bInterval = 4,
};
static struct usb_endpoint_descriptor ss_epin_fback_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
.wMaxPacketSize = cpu_to_le16(4),
.bInterval = 4,
};
static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = {
.bLength = sizeof(ss_epin_fback_desc_comp),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 0,
.bmAttributes = 0,
.wBytesPerInterval = cpu_to_le16(4),
};
/* Audio Streaming IN Interface - Alt0 */
static struct usb_interface_descriptor std_as_in_if0_desc = {
.bLength = sizeof std_as_in_if0_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
.bInterfaceProtocol = UAC_VERSION_2,
};
/* Audio Streaming IN Interface - Alt1 */
static struct usb_interface_descriptor std_as_in_if1_desc = {
.bLength = sizeof std_as_in_if1_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 1,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
.bInterfaceProtocol = UAC_VERSION_2,
};
/* Audio Stream IN Intface Desc */
static struct uac2_as_header_descriptor as_in_hdr_desc = {
.bLength = sizeof as_in_hdr_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_AS_GENERAL,
/* .bTerminalLink = DYNAMIC */
.bmControls = 0,
.bFormatType = UAC_FORMAT_TYPE_I,
.bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
.iChannelNames = 0,
};
/* Audio USB_IN Format */
static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
.bLength = sizeof as_in_fmt1_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_FORMAT_TYPE,
.bFormatType = UAC_FORMAT_TYPE_I,
};
/* STD AS ISO IN Endpoint */
static struct usb_endpoint_descriptor fs_epin_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
/* .wMaxPacketSize = DYNAMIC */
.bInterval = 1,
};
static struct usb_endpoint_descriptor hs_epin_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
/* .wMaxPacketSize = DYNAMIC */
/* .bInterval = DYNAMIC */
};
static struct usb_endpoint_descriptor ss_epin_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
/* .wMaxPacketSize = DYNAMIC */
/* .bInterval = DYNAMIC */
};
static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = {
.bLength = sizeof(ss_epin_desc_comp),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 0,
.bmAttributes = 0,
/* wBytesPerInterval = DYNAMIC */
};
/* CS AS ISO IN Endpoint */
static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
.bLength = sizeof as_iso_in_desc,
.bDescriptorType = USB_DT_CS_ENDPOINT,
.bDescriptorSubtype = UAC_EP_GENERAL,
.bmAttributes = 0,
.bmControls = 0,
.bLockDelayUnits = 0,
.wLockDelay = 0,
};
static struct usb_descriptor_header *fs_audio_desc[] = {
(struct usb_descriptor_header *)&iad_desc,
(struct usb_descriptor_header *)&std_ac_if_desc,
(struct usb_descriptor_header *)&ac_hdr_desc,
(struct usb_descriptor_header *)&in_clk_src_desc,
(struct usb_descriptor_header *)&out_clk_src_desc,
(struct usb_descriptor_header *)&usb_out_it_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 *)&io_out_ot_desc,
(struct usb_descriptor_header *)&fs_ep_int_desc,
(struct usb_descriptor_header *)&std_as_out_if0_desc,
(struct usb_descriptor_header *)&std_as_out_if1_desc,
(struct usb_descriptor_header *)&as_out_hdr_desc,
(struct usb_descriptor_header *)&as_out_fmt1_desc,
(struct usb_descriptor_header *)&fs_epout_desc,
(struct usb_descriptor_header *)&as_iso_out_desc,
(struct usb_descriptor_header *)&fs_epin_fback_desc,
(struct usb_descriptor_header *)&std_as_in_if0_desc,
(struct usb_descriptor_header *)&std_as_in_if1_desc,
(struct usb_descriptor_header *)&as_in_hdr_desc,
(struct usb_descriptor_header *)&as_in_fmt1_desc,
(struct usb_descriptor_header *)&fs_epin_desc,
(struct usb_descriptor_header *)&as_iso_in_desc,
NULL,
};
static struct usb_descriptor_header *hs_audio_desc[] = {
(struct usb_descriptor_header *)&iad_desc,
(struct usb_descriptor_header *)&std_ac_if_desc,
(struct usb_descriptor_header *)&ac_hdr_desc,
(struct usb_descriptor_header *)&in_clk_src_desc,
(struct usb_descriptor_header *)&out_clk_src_desc,
(struct usb_descriptor_header *)&usb_out_it_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 *)&io_out_ot_desc,
(struct usb_descriptor_header *)&hs_ep_int_desc,
(struct usb_descriptor_header *)&std_as_out_if0_desc,
(struct usb_descriptor_header *)&std_as_out_if1_desc,
(struct usb_descriptor_header *)&as_out_hdr_desc,
(struct usb_descriptor_header *)&as_out_fmt1_desc,
(struct usb_descriptor_header *)&hs_epout_desc,
(struct usb_descriptor_header *)&as_iso_out_desc,
(struct usb_descriptor_header *)&hs_epin_fback_desc,
(struct usb_descriptor_header *)&std_as_in_if0_desc,
(struct usb_descriptor_header *)&std_as_in_if1_desc,
(struct usb_descriptor_header *)&as_in_hdr_desc,
(struct usb_descriptor_header *)&as_in_fmt1_desc,
(struct usb_descriptor_header *)&hs_epin_desc,
(struct usb_descriptor_header *)&as_iso_in_desc,
NULL,
};
static struct usb_descriptor_header *ss_audio_desc[] = {
(struct usb_descriptor_header *)&iad_desc,
(struct usb_descriptor_header *)&std_ac_if_desc,
(struct usb_descriptor_header *)&ac_hdr_desc,
(struct usb_descriptor_header *)&in_clk_src_desc,
(struct usb_descriptor_header *)&out_clk_src_desc,
(struct usb_descriptor_header *)&usb_out_it_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 *)&io_out_ot_desc,
(struct usb_descriptor_header *)&ss_ep_int_desc,
(struct usb_descriptor_header *)&ss_ep_int_desc_comp,
(struct usb_descriptor_header *)&std_as_out_if0_desc,
(struct usb_descriptor_header *)&std_as_out_if1_desc,
(struct usb_descriptor_header *)&as_out_hdr_desc,
(struct usb_descriptor_header *)&as_out_fmt1_desc,
(struct usb_descriptor_header *)&ss_epout_desc,
(struct usb_descriptor_header *)&ss_epout_desc_comp,
(struct usb_descriptor_header *)&as_iso_out_desc,
(struct usb_descriptor_header *)&ss_epin_fback_desc,
(struct usb_descriptor_header *)&ss_epin_fback_desc_comp,
(struct usb_descriptor_header *)&std_as_in_if0_desc,
(struct usb_descriptor_header *)&std_as_in_if1_desc,
(struct usb_descriptor_header *)&as_in_hdr_desc,
(struct usb_descriptor_header *)&as_in_fmt1_desc,
(struct usb_descriptor_header *)&ss_epin_desc,
(struct usb_descriptor_header *)&ss_epin_desc_comp,
(struct usb_descriptor_header *)&as_iso_in_desc,
NULL,
};
struct cntrl_cur_lay2 {
__le16 wCUR;
};
struct cntrl_range_lay2 {
__le16 wNumSubRanges;
__le16 wMIN;
__le16 wMAX;
__le16 wRES;
} __packed;
struct cntrl_cur_lay3 {
__le32 dCUR;
};
struct cntrl_subrange_lay3 {
__le32 dMIN;
__le32 dMAX;
__le32 dRES;
} __packed;
#define ranges_lay3_size(c) (sizeof(c.wNumSubRanges) \
+ le16_to_cpu(c.wNumSubRanges) \
* sizeof(struct cntrl_subrange_lay3))
#define DECLARE_UAC2_CNTRL_RANGES_LAY3(k, n) \
struct cntrl_ranges_lay3_##k { \
__le16 wNumSubRanges; \
struct cntrl_subrange_lay3 r[n]; \
} __packed
DECLARE_UAC2_CNTRL_RANGES_LAY3(srates, UAC_MAX_RATES);
static int get_max_srate(const int *srates)
{
int i, max_srate = 0;
for (i = 0; i < UAC_MAX_RATES; i++) {
if (srates[i] == 0)
break;
if (srates[i] > max_srate)
max_srate = srates[i];
}
return max_srate;
}
static int get_max_bw_for_bint(const struct f_uac2_opts *uac2_opts,
u8 bint, unsigned int factor, bool is_playback)
{
int chmask, srate, ssize;
u16 max_size_bw;
if (is_playback) {
chmask = uac2_opts->p_chmask;
srate = get_max_srate(uac2_opts->p_srates);
ssize = uac2_opts->p_ssize;
} else {
chmask = uac2_opts->c_chmask;
srate = get_max_srate(uac2_opts->c_srates);
ssize = uac2_opts->c_ssize;
}
if (is_playback || (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) {
// playback is always async, capture only when configured
// Win10 requires max packet size + 1 frame
srate = srate * (1000 + uac2_opts->fb_max) / 1000;
// updated srate is always bigger, therefore DIV_ROUND_UP always yields +1
max_size_bw = num_channels(chmask) * ssize *
(DIV_ROUND_UP(srate, factor / (1 << (bint - 1))));
} else {
// adding 1 frame provision for Win10
max_size_bw = num_channels(chmask) * ssize *
(DIV_ROUND_UP(srate, factor / (1 << (bint - 1))) + 1);
}
return max_size_bw;
}
static int set_ep_max_packet_size_bint(struct device *dev, const struct f_uac2_opts *uac2_opts,
struct usb_endpoint_descriptor *ep_desc,
enum usb_device_speed speed, bool is_playback)
{
u16 max_size_bw, max_size_ep;
u8 bint, opts_bint;
char *dir;
switch (speed) {
case USB_SPEED_FULL:
max_size_ep = 1023;
// fixed
bint = ep_desc->bInterval;
max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 1000, is_playback);
break;
case USB_SPEED_HIGH:
case USB_SPEED_SUPER:
max_size_ep = 1024;
if (is_playback)
opts_bint = uac2_opts->p_hs_bint;
else
opts_bint = uac2_opts->c_hs_bint;
if (opts_bint > 0) {
/* fixed bint */
bint = opts_bint;
max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 8000, is_playback);
} else {
/* checking bInterval from 4 to 1 whether the required bandwidth fits */
for (bint = 4; bint > 0; --bint) {
max_size_bw = get_max_bw_for_bint(
uac2_opts, bint, 8000, is_playback);
if (max_size_bw <= max_size_ep)
break;
}
}
break;
default:
return -EINVAL;
}
if (is_playback)
dir = "Playback";
else
dir = "Capture";
if (max_size_bw <= max_size_ep)
dev_dbg(dev,
"%s %s: Would use wMaxPacketSize %d and bInterval %d\n",
speed_names[speed], dir, max_size_bw, bint);
else {
dev_warn(dev,
"%s %s: Req. wMaxPacketSize %d at bInterval %d > max ISOC %d, may drop data!\n",
speed_names[speed], dir, max_size_bw, bint, max_size_ep);
max_size_bw = max_size_ep;
}
ep_desc->wMaxPacketSize = cpu_to_le16(max_size_bw);
ep_desc->bInterval = bint;
return 0;
}
static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask)
{
struct uac2_feature_unit_descriptor *fu_desc;
int channels = num_channels(chmask);
int fu_desc_size = UAC2_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;
/* bUnitID, bSourceID and bmaControls will be defined later */
return fu_desc;
}
/* Use macro to overcome line length limitation */
#define USBDHDR(p) (struct usb_descriptor_header *)(p)
static void setup_headers(struct f_uac2_opts *opts,
struct usb_descriptor_header **headers,
enum usb_device_speed speed)
{
struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
struct usb_ss_ep_comp_descriptor *ep_int_desc_comp = NULL;
struct usb_endpoint_descriptor *epout_desc;
struct usb_endpoint_descriptor *epin_desc;
struct usb_endpoint_descriptor *epin_fback_desc;
struct usb_endpoint_descriptor *ep_int_desc;
int i;
switch (speed) {
case USB_SPEED_FULL:
epout_desc = &fs_epout_desc;
epin_desc = &fs_epin_desc;
epin_fback_desc = &fs_epin_fback_desc;
ep_int_desc = &fs_ep_int_desc;
break;
case USB_SPEED_HIGH:
epout_desc = &hs_epout_desc;
epin_desc = &hs_epin_desc;
epin_fback_desc = &hs_epin_fback_desc;
ep_int_desc = &hs_ep_int_desc;
break;
default:
epout_desc = &ss_epout_desc;
epin_desc = &ss_epin_desc;
epout_desc_comp = &ss_epout_desc_comp;
epin_desc_comp = &ss_epin_desc_comp;
epin_fback_desc = &ss_epin_fback_desc;
epin_fback_desc_comp = &ss_epin_fback_desc_comp;
ep_int_desc = &ss_ep_int_desc;
ep_int_desc_comp = &ss_ep_int_desc_comp;
}
i = 0;
headers[i++] = USBDHDR(&iad_desc);
headers[i++] = USBDHDR(&std_ac_if_desc);
headers[i++] = USBDHDR(&ac_hdr_desc);
if (EPIN_EN(opts))
headers[i++] = USBDHDR(&in_clk_src_desc);
if (EPOUT_EN(opts)) {
headers[i++] = USBDHDR(&out_clk_src_desc);
headers[i++] = USBDHDR(&usb_out_it_desc);
if (FUOUT_EN(opts))
headers[i++] = USBDHDR(out_feature_unit_desc);
}
if (EPIN_EN(opts)) {
headers[i++] = USBDHDR(&io_in_it_desc);
if (FUIN_EN(opts))
headers[i++] = USBDHDR(in_feature_unit_desc);
headers[i++] = USBDHDR(&usb_in_ot_desc);
}
if (EPOUT_EN(opts))
headers[i++] = USBDHDR(&io_out_ot_desc);
if (FUOUT_EN(opts) || FUIN_EN(opts)) {
headers[i++] = USBDHDR(ep_int_desc);
if (ep_int_desc_comp)
headers[i++] = USBDHDR(ep_int_desc_comp);
}
if (EPOUT_EN(opts)) {
headers[i++] = USBDHDR(&std_as_out_if0_desc);
headers[i++] = USBDHDR(&std_as_out_if1_desc);
headers[i++] = USBDHDR(&as_out_hdr_desc);
headers[i++] = USBDHDR(&as_out_fmt1_desc);
headers[i++] = USBDHDR(epout_desc);
if (epout_desc_comp)
headers[i++] = USBDHDR(epout_desc_comp);
headers[i++] = USBDHDR(&as_iso_out_desc);
if (EPOUT_FBACK_IN_EN(opts)) {
headers[i++] = USBDHDR(epin_fback_desc);
if (epin_fback_desc_comp)
headers[i++] = USBDHDR(epin_fback_desc_comp);
}
}
if (EPIN_EN(opts)) {
headers[i++] = USBDHDR(&std_as_in_if0_desc);
headers[i++] = USBDHDR(&std_as_in_if1_desc);
headers[i++] = USBDHDR(&as_in_hdr_desc);
headers[i++] = USBDHDR(&as_in_fmt1_desc);
headers[i++] = USBDHDR(epin_desc);
if (epin_desc_comp)
headers[i++] = USBDHDR(epin_desc_comp);
headers[i++] = USBDHDR(&as_iso_in_desc);
}
headers[i] = NULL;
}
static void setup_descriptor(struct f_uac2_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 (EPOUT_EN(opts))
out_clk_src_desc.bClockID = i++;
if (EPIN_EN(opts))
in_clk_src_desc.bClockID = i++;
usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID;
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;
}
usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID;
io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID;
io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID;
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_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
iad_desc.bInterfaceCount = 1;
ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc));
if (EPIN_EN(opts)) {
u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
len += sizeof(in_clk_src_desc);
len += sizeof(usb_in_ot_desc);
if (FUIN_EN(opts))
len += in_feature_unit_desc->bLength;
len += sizeof(io_in_it_desc);
ac_hdr_desc.wTotalLength = cpu_to_le16(len);
iad_desc.bInterfaceCount++;
}
if (EPOUT_EN(opts)) {
u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
len += sizeof(out_clk_src_desc);
len += sizeof(usb_out_it_desc);
if (FUOUT_EN(opts))
len += out_feature_unit_desc->bLength;
len += sizeof(io_out_ot_desc);
ac_hdr_desc.wTotalLength = cpu_to_le16(len);
iad_desc.bInterfaceCount++;
}
io_in_it_desc.wTerminalType = cpu_to_le16(opts->c_terminal_type);
io_out_ot_desc.wTerminalType = cpu_to_le16(opts->p_terminal_type);
setup_headers(opts, fs_audio_desc, USB_SPEED_FULL);
setup_headers(opts, hs_audio_desc, USB_SPEED_HIGH);
setup_headers(opts, ss_audio_desc, USB_SPEED_SUPER);
}
static int afunc_validate_opts(struct g_audio *agdev, struct device *dev)
{
struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
const char *msg = NULL;
if (!opts->p_chmask && !opts->c_chmask)
msg = "no playback and capture channels";
else if (opts->p_chmask & ~UAC2_CHANNEL_MASK)
msg = "unsupported playback channels mask";
else if (opts->c_chmask & ~UAC2_CHANNEL_MASK)
msg = "unsupported capture channels mask";
else if ((opts->p_ssize < 1) || (opts->p_ssize > 4))
msg = "incorrect playback sample size";
else if ((opts->c_ssize < 1) || (opts->c_ssize > 4))
msg = "incorrect capture sample size";
else if (!opts->p_srates[0])
msg = "incorrect playback sampling rate";
else if (!opts->c_srates[0])
msg = "incorrect capture sampling rate";
else if (opts->p_volume_max <= opts->p_volume_min)
msg = "incorrect playback volume max/min";
else if (opts->c_volume_max <= opts->c_volume_min)
msg = "incorrect capture volume max/min";
else if (opts->p_volume_res <= 0)
msg = "negative/zero playback volume resolution";
else if (opts->c_volume_res <= 0)
msg = "negative/zero capture volume resolution";
else if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res)
msg = "incorrect playback volume resolution";
else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res)
msg = "incorrect capture volume resolution";
else if ((opts->p_hs_bint < 0) || (opts->p_hs_bint > 4))
msg = "incorrect playback HS/SS bInterval (1-4: fixed, 0: auto)";
else if ((opts->c_hs_bint < 0) || (opts->c_hs_bint > 4))
msg = "incorrect capture HS/SS bInterval (1-4: fixed, 0: auto)";
if (msg) {
dev_err(dev, "Error: %s\n", msg);
return -EINVAL;
}
return 0;
}
static int
afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
{
struct f_uac2 *uac2 = func_to_uac2(fn);
struct g_audio *agdev = func_to_g_audio(fn);
struct usb_composite_dev *cdev = cfg->cdev;
struct usb_gadget *gadget = cdev->gadget;
struct device *dev = &gadget->dev;
struct f_uac2_opts *uac2_opts = g_audio_to_uac2_opts(agdev);
struct usb_string *us;
int ret;
ret = afunc_validate_opts(agdev, dev);
if (ret)
return ret;
strings_fn[STR_ASSOC].s = uac2_opts->function_name;
strings_fn[STR_IF_CTRL].s = uac2_opts->if_ctrl_name;
strings_fn[STR_CLKSRC_IN].s = uac2_opts->clksrc_in_name;
strings_fn[STR_CLKSRC_OUT].s = uac2_opts->clksrc_out_name;
strings_fn[STR_USB_IT].s = uac2_opts->c_it_name;
strings_fn[STR_USB_IT_CH].s = uac2_opts->c_it_ch_name;
strings_fn[STR_IO_OT].s = uac2_opts->c_ot_name;
strings_fn[STR_FU_OUT].s = uac2_opts->c_fu_vol_name;
strings_fn[STR_AS_OUT_ALT0].s = "Playback Inactive";
strings_fn[STR_AS_OUT_ALT1].s = "Playback Active";
strings_fn[STR_IO_IT].s = uac2_opts->p_it_name;
strings_fn[STR_IO_IT_CH].s = uac2_opts->p_it_ch_name;
strings_fn[STR_USB_OT].s = uac2_opts->p_ot_name;
strings_fn[STR_FU_IN].s = uac2_opts->p_fu_vol_name;
strings_fn[STR_AS_IN_ALT0].s = "Capture Inactive";
strings_fn[STR_AS_IN_ALT1].s = "Capture Active";
us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
if (IS_ERR(us))
return PTR_ERR(us);
if (FUOUT_EN(uac2_opts)) {
out_feature_unit_desc = build_fu_desc(uac2_opts->c_chmask);
if (!out_feature_unit_desc)
return -ENOMEM;
}
if (FUIN_EN(uac2_opts)) {
in_feature_unit_desc = build_fu_desc(uac2_opts->p_chmask);
if (!in_feature_unit_desc) {
ret = -ENOMEM;
goto err_free_fu;
}
}
iad_desc.iFunction = us[STR_ASSOC].id;
std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
usb_out_it_desc.iChannelNames = us[STR_USB_IT_CH].id;
io_in_it_desc.iTerminal = us[STR_IO_IT].id;
io_in_it_desc.iChannelNames = us[STR_IO_IT_CH].id;
usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
if (FUOUT_EN(uac2_opts)) {
u8 *i_feature = (u8 *)out_feature_unit_desc +
out_feature_unit_desc->bLength - 1;
*i_feature = us[STR_FU_OUT].id;
}
if (FUIN_EN(uac2_opts)) {
u8 *i_feature = (u8 *)in_feature_unit_desc +
in_feature_unit_desc->bLength - 1;
*i_feature = us[STR_FU_IN].id;
}
/* Initialize the configurable parameters */
usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
if (FUOUT_EN(uac2_opts)) {
__le32 *bma = (__le32 *)&out_feature_unit_desc->bmaControls[0];
u32 control = 0;
if (uac2_opts->c_mute_present)
control |= CONTROL_RDWR << FU_MUTE_CTRL;
if (uac2_opts->c_volume_present)
control |= CONTROL_RDWR << FU_VOL_CTRL;
*bma = cpu_to_le32(control);
}
if (FUIN_EN(uac2_opts)) {
__le32 *bma = (__le32 *)&in_feature_unit_desc->bmaControls[0];
u32 control = 0;
if (uac2_opts->p_mute_present)
control |= CONTROL_RDWR << FU_MUTE_CTRL;
if (uac2_opts->p_volume_present)
control |= CONTROL_RDWR << FU_VOL_CTRL;
*bma = cpu_to_le32(control);
}
ret = usb_interface_id(cfg, fn);
if (ret < 0) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
goto err_free_fu;
}
iad_desc.bFirstInterface = ret;
std_ac_if_desc.bInterfaceNumber = ret;
uac2->ac_intf = ret;
uac2->ac_alt = 0;
if (EPOUT_EN(uac2_opts)) {
ret = usb_interface_id(cfg, fn);
if (ret < 0) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
goto err_free_fu;
}
std_as_out_if0_desc.bInterfaceNumber = ret;
std_as_out_if1_desc.bInterfaceNumber = ret;
std_as_out_if1_desc.bNumEndpoints = 1;
uac2->as_out_intf = ret;
uac2->as_out_alt = 0;
if (EPOUT_FBACK_IN_EN(uac2_opts)) {
fs_epout_desc.bmAttributes =
USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
hs_epout_desc.bmAttributes =
USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
ss_epout_desc.bmAttributes =
USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
std_as_out_if1_desc.bNumEndpoints++;
} else {
fs_epout_desc.bmAttributes =
USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
hs_epout_desc.bmAttributes =
USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
ss_epout_desc.bmAttributes =
USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
}
}
if (EPIN_EN(uac2_opts)) {
ret = usb_interface_id(cfg, fn);
if (ret < 0) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
goto err_free_fu;
}
std_as_in_if0_desc.bInterfaceNumber = ret;
std_as_in_if1_desc.bInterfaceNumber = ret;
uac2->as_in_intf = ret;
uac2->as_in_alt = 0;
}
if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) {
uac2->int_ep = usb_ep_autoconfig(gadget, &fs_ep_int_desc);
if (!uac2->int_ep) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
ret = -ENODEV;
goto err_free_fu;
}
std_ac_if_desc.bNumEndpoints = 1;
}
hs_epin_desc.bInterval = uac2_opts->p_hs_bint;
ss_epin_desc.bInterval = uac2_opts->p_hs_bint;
hs_epout_desc.bInterval = uac2_opts->c_hs_bint;
ss_epout_desc.bInterval = uac2_opts->c_hs_bint;
/* Calculate wMaxPacketSize according to audio bandwidth */
ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epin_desc,
USB_SPEED_FULL, true);
if (ret < 0) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return ret;
}
ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epout_desc,
USB_SPEED_FULL, false);
if (ret < 0) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return ret;
}
ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epin_desc,
USB_SPEED_HIGH, true);
if (ret < 0) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return ret;
}
ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epout_desc,
USB_SPEED_HIGH, false);
if (ret < 0) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return ret;
}
ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epin_desc,
USB_SPEED_SUPER, true);
if (ret < 0) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return ret;
}
ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epout_desc,
USB_SPEED_SUPER, false);
if (ret < 0) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return ret;
}
if (EPOUT_EN(uac2_opts)) {
agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
if (!agdev->out_ep) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
ret = -ENODEV;
goto err_free_fu;
}
if (EPOUT_FBACK_IN_EN(uac2_opts)) {
agdev->in_ep_fback = usb_ep_autoconfig(gadget,
&fs_epin_fback_desc);
if (!agdev->in_ep_fback) {
dev_err(dev, "%s:%d Error!\n",
__func__, __LINE__);
ret = -ENODEV;
goto err_free_fu;
}
}
}
if (EPIN_EN(uac2_opts)) {
agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
if (!agdev->in_ep) {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
ret = -ENODEV;
goto err_free_fu;
}
}
agdev->in_ep_maxpsize = max_t(u16,
le16_to_cpu(fs_epin_desc.wMaxPacketSize),
le16_to_cpu(hs_epin_desc.wMaxPacketSize));
agdev->out_ep_maxpsize = max_t(u16,
le16_to_cpu(fs_epout_desc.wMaxPacketSize),
le16_to_cpu(hs_epout_desc.wMaxPacketSize));
agdev->in_ep_maxpsize = max_t(u16, agdev->in_ep_maxpsize,
le16_to_cpu(ss_epin_desc.wMaxPacketSize));
agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize,
le16_to_cpu(ss_epout_desc.wMaxPacketSize));
ss_epin_desc_comp.wBytesPerInterval = ss_epin_desc.wMaxPacketSize;
ss_epout_desc_comp.wBytesPerInterval = ss_epout_desc.wMaxPacketSize;
// HS and SS endpoint addresses are copied from autoconfigured FS descriptors
hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
ss_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
ss_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
ss_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
ss_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
setup_descriptor(uac2_opts);
ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, ss_audio_desc,
ss_audio_desc);
if (ret)
goto err_free_fu;
agdev->gadget = gadget;
agdev->params.p_chmask = uac2_opts->p_chmask;
memcpy(agdev->params.p_srates, uac2_opts->p_srates,
sizeof(agdev->params.p_srates));
agdev->params.p_ssize = uac2_opts->p_ssize;
if (FUIN_EN(uac2_opts)) {
agdev->params.p_fu.id = USB_IN_FU_ID;
agdev->params.p_fu.mute_present = uac2_opts->p_mute_present;
agdev->params.p_fu.volume_present = uac2_opts->p_volume_present;
agdev->params.p_fu.volume_min = uac2_opts->p_volume_min;
agdev->params.p_fu.volume_max = uac2_opts->p_volume_max;
agdev->params.p_fu.volume_res = uac2_opts->p_volume_res;
}
agdev->params.c_chmask = uac2_opts->c_chmask;
memcpy(agdev->params.c_srates, uac2_opts->c_srates,
sizeof(agdev->params.c_srates));
agdev->params.c_ssize = uac2_opts->c_ssize;
if (FUOUT_EN(uac2_opts)) {
agdev->params.c_fu.id = USB_OUT_FU_ID;
agdev->params.c_fu.mute_present = uac2_opts->c_mute_present;
agdev->params.c_fu.volume_present = uac2_opts->c_volume_present;
agdev->params.c_fu.volume_min = uac2_opts->c_volume_min;
agdev->params.c_fu.volume_max = uac2_opts->c_volume_max;
agdev->params.c_fu.volume_res = uac2_opts->c_volume_res;
}
agdev->params.req_number = uac2_opts->req_number;
agdev->params.fb_max = uac2_opts->fb_max;
if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts))
agdev->notify = afunc_notify;
ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
if (ret)
goto err_free_descs;
return 0;
err_free_descs:
usb_free_all_descriptors(fn);
agdev->gadget = NULL;
err_free_fu:
kfree(out_feature_unit_desc);
out_feature_unit_desc = NULL;
kfree(in_feature_unit_desc);
in_feature_unit_desc = NULL;
return ret;
}
static void
afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req)
{
struct g_audio *agdev = req->context;
struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
atomic_dec(&uac2->int_count);
kfree(req->buf);
usb_ep_free_request(_ep, req);
}
static int
afunc_notify(struct g_audio *agdev, int unit_id, int cs)
{
struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
struct usb_request *req;
struct uac2_interrupt_data_msg *msg;
u16 w_index, w_value;
int ret;
if (!uac2->int_ep->enabled)
return 0;
if (atomic_inc_return(&uac2->int_count) > UAC2_DEF_INT_REQ_NUM) {
atomic_dec(&uac2->int_count);
return 0;
}
req = usb_ep_alloc_request(uac2->int_ep, GFP_ATOMIC);
if (req == NULL) {
ret = -ENOMEM;
goto err_dec_int_count;
}
msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
if (msg == NULL) {
ret = -ENOMEM;
goto err_free_request;
}
w_index = unit_id << 8 | uac2->ac_intf;
w_value = cs << 8;
msg->bInfo = 0; /* Non-vendor, interface interrupt */
msg->bAttribute = UAC2_CS_CUR;
msg->wIndex = cpu_to_le16(w_index);
msg->wValue = cpu_to_le16(w_value);
req->length = sizeof(*msg);
req->buf = msg;
req->context = agdev;
req->complete = afunc_notify_complete;
ret = usb_ep_queue(uac2->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(uac2->int_ep, req);
err_dec_int_count:
atomic_dec(&uac2->int_count);
return ret;
}
static int
afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
{
struct usb_composite_dev *cdev = fn->config->cdev;
struct f_uac2 *uac2 = func_to_uac2(fn);
struct g_audio *agdev = func_to_g_audio(fn);
struct usb_gadget *gadget = cdev->gadget;
struct device *dev = &gadget->dev;
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 == uac2->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 (uac2->int_ep) {
usb_ep_disable(uac2->int_ep);
config_ep_by_speed(gadget, &agdev->func, uac2->int_ep);
usb_ep_enable(uac2->int_ep);
}
return 0;
}
if (intf == uac2->as_out_intf) {
uac2->as_out_alt = alt;
if (alt)
ret = u_audio_start_capture(&uac2->g_audio);
else
u_audio_stop_capture(&uac2->g_audio);
} else if (intf == uac2->as_in_intf) {
uac2->as_in_alt = alt;
if (alt)
ret = u_audio_start_playback(&uac2->g_audio);
else
u_audio_stop_playback(&uac2->g_audio);
} else {
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
return -EINVAL;
}
return ret;
}
static int
afunc_get_alt(struct usb_function *fn, unsigned intf)
{
struct f_uac2 *uac2 = func_to_uac2(fn);
struct g_audio *agdev = func_to_g_audio(fn);
if (intf == uac2->ac_intf)
return uac2->ac_alt;
else if (intf == uac2->as_out_intf)
return uac2->as_out_alt;
else if (intf == uac2->as_in_intf)
return uac2->as_in_alt;
else
dev_err(&agdev->gadget->dev,
"%s:%d Invalid Interface %d!\n",
__func__, __LINE__, intf);
return -EINVAL;
}
static void
afunc_disable(struct usb_function *fn)
{
struct f_uac2 *uac2 = func_to_uac2(fn);
uac2->as_in_alt = 0;
uac2->as_out_alt = 0;
u_audio_stop_capture(&uac2->g_audio);
u_audio_stop_playback(&uac2->g_audio);
if (uac2->int_ep)
usb_ep_disable(uac2->int_ep);
}
static void
afunc_suspend(struct usb_function *fn)
{
struct f_uac2 *uac2 = func_to_uac2(fn);
u_audio_suspend(&uac2->g_audio);
}
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 *agdev = func_to_g_audio(fn);
struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
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;
u32 p_srate, c_srate;
u_audio_get_playback_srate(agdev, &p_srate);
u_audio_get_capture_srate(agdev, &c_srate);
if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
struct cntrl_cur_lay3 c;
memset(&c, 0, sizeof(struct cntrl_cur_lay3));
if (entity_id == USB_IN_CLK_ID)
c.dCUR = cpu_to_le32(p_srate);
else if (entity_id == USB_OUT_CLK_ID)
c.dCUR = cpu_to_le32(c_srate);
value = min_t(unsigned int, w_length, sizeof(c));
memcpy(req->buf, &c, value);
} else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
*(u8 *)req->buf = 1;
value = min_t(unsigned int, w_length, 1);
} else {
dev_err(&agdev->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
} else 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(agdev, is_playback, &mute);
*(u8 *)req->buf = mute;
value = min_t(unsigned int, w_length, 1);
} else if (control_selector == UAC_FU_VOLUME) {
struct cntrl_cur_lay2 c;
s16 volume;
memset(&c, 0, sizeof(struct cntrl_cur_lay2));
u_audio_get_volume(agdev, is_playback, &volume);
c.wCUR = cpu_to_le16(volume);
value = min_t(unsigned int, w_length, sizeof(c));
memcpy(req->buf, &c, value);
} else {
dev_err(&agdev->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
} else {
dev_err(&agdev->gadget->dev,
"%s:%d entity_id=%d control_selector=%d TODO!\n",
__func__, __LINE__, entity_id, control_selector);
}
return value;
}
static int
in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_request *req = fn->config->cdev->req;
struct g_audio *agdev = func_to_g_audio(fn);
struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
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 ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
struct cntrl_ranges_lay3_srates rs;
int i;
int wNumSubRanges = 0;
int srate;
int *srates;
if (entity_id == USB_IN_CLK_ID)
srates = opts->p_srates;
else if (entity_id == USB_OUT_CLK_ID)
srates = opts->c_srates;
else
return -EOPNOTSUPP;
for (i = 0; i < UAC_MAX_RATES; i++) {
srate = srates[i];
if (srate == 0)
break;
rs.r[wNumSubRanges].dMIN = cpu_to_le32(srate);
rs.r[wNumSubRanges].dMAX = cpu_to_le32(srate);
rs.r[wNumSubRanges].dRES = 0;
wNumSubRanges++;
dev_dbg(&agdev->gadget->dev,
"%s(): clk %d: rate ID %d: %d\n",
__func__, entity_id, wNumSubRanges, srate);
}
rs.wNumSubRanges = cpu_to_le16(wNumSubRanges);
value = min_t(unsigned int, w_length, ranges_lay3_size(rs));
dev_dbg(&agdev->gadget->dev, "%s(): sending %d rates, size %d\n",
__func__, rs.wNumSubRanges, value);
memcpy(req->buf, &rs, value);
} else {
dev_err(&agdev->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
} else 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) {
struct cntrl_range_lay2 r;
s16 max_db, min_db, res_db;
if (is_playback) {
max_db = opts->p_volume_max;
min_db = opts->p_volume_min;
res_db = opts->p_volume_res;
} else {
max_db = opts->c_volume_max;
min_db = opts->c_volume_min;
res_db = opts->c_volume_res;
}
r.wMAX = cpu_to_le16(max_db);
r.wMIN = cpu_to_le16(min_db);
r.wRES = cpu_to_le16(res_db);
r.wNumSubRanges = cpu_to_le16(1);
value = min_t(unsigned int, w_length, sizeof(r));
memcpy(req->buf, &r, value);
} else {
dev_err(&agdev->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
}
} else {
dev_err(&agdev->gadget->dev,
"%s:%d entity_id=%d control_selector=%d TODO!\n",
__func__, __LINE__, entity_id, control_selector);
}
return value;
}
static int
ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
if (cr->bRequest == UAC2_CS_CUR)
return in_rq_cur(fn, cr);
else if (cr->bRequest == UAC2_CS_RANGE)
return in_rq_range(fn, cr);
else
return -EOPNOTSUPP;
}
static void uac2_cs_control_sam_freq(struct usb_ep *ep, struct usb_request *req)
{
struct usb_function *fn = ep->driver_data;
struct g_audio *agdev = func_to_g_audio(fn);
struct f_uac2 *uac2 = func_to_uac2(fn);
u32 val;
if (req->actual != 4)
return;
val = le32_to_cpu(*((__le32 *)req->buf));
dev_dbg(&agdev->gadget->dev, "%s val: %d.\n", __func__, val);
if (uac2->clock_id == USB_IN_CLK_ID) {
u_audio_set_playback_srate(agdev, val);
} else if (uac2->clock_id == USB_OUT_CLK_ID) {
u_audio_set_capture_srate(agdev, val);
}
}
static void
out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
{
struct g_audio *agdev = req->context;
struct usb_composite_dev *cdev = agdev->func.config->cdev;
struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
struct usb_ctrlrequest *cr = &uac2->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(agdev, is_playback, mute);
return;
} else if (control_selector == UAC_FU_VOLUME) {
struct cntrl_cur_lay2 *c = req->buf;
s16 volume;
volume = le16_to_cpu(c->wCUR);
u_audio_set_volume(agdev, is_playback, volume);
return;
} else {
dev_err(&agdev->gadget->dev,
"%s:%d control_selector=%d TODO!\n",
__func__, __LINE__, control_selector);
usb_ep_set_halt(ep);
}
}
}
static int
out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_composite_dev *cdev = fn->config->cdev;
struct usb_request *req = fn->config->cdev->req;
struct g_audio *agdev = func_to_g_audio(fn);
struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
struct f_uac2 *uac2 = func_to_uac2(fn);
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;
u8 clock_id = w_index >> 8;
if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
dev_dbg(&agdev->gadget->dev,
"control_selector UAC2_CS_CONTROL_SAM_FREQ, clock: %d\n", clock_id);
cdev->gadget->ep0->driver_data = fn;
uac2->clock_id = clock_id;
req->complete = uac2_cs_control_sam_freq;
return w_length;
}
} else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
(FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
memcpy(&uac2->setup_cr, cr, sizeof(*cr));
req->context = agdev;
req->complete = out_rq_cur_complete;
return w_length;
} else {
dev_err(&agdev->gadget->dev,
"%s:%d entity_id=%d control_selector=%d TODO!\n",
__func__, __LINE__, entity_id, control_selector);
}
return -EOPNOTSUPP;
}
static int
setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct f_uac2 *uac2 = func_to_uac2(fn);
struct g_audio *agdev = func_to_g_audio(fn);
u16 w_index = le16_to_cpu(cr->wIndex);
u8 intf = w_index & 0xff;
if (intf != uac2->ac_intf) {
dev_err(&agdev->gadget->dev,
"%s:%d Error!\n", __func__, __LINE__);
return -EOPNOTSUPP;
}
if (cr->bRequestType & USB_DIR_IN)
return ac_rq_in(fn, cr);
else if (cr->bRequest == UAC2_CS_CUR)
return out_rq_cur(fn, cr);
return -EOPNOTSUPP;
}
static int
afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
{
struct usb_composite_dev *cdev = fn->config->cdev;
struct g_audio *agdev = func_to_g_audio(fn);
struct usb_request *req = cdev->req;
u16 w_length = le16_to_cpu(cr->wLength);
int value = -EOPNOTSUPP;
/* Only Class specific requests are supposed to reach here */
if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
return -EOPNOTSUPP;
if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
value = setup_rq_inf(fn, cr);
else
dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
__func__, __LINE__);
if (value >= 0) {
req->length = value;
req->zero = value < w_length;
value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
if (value < 0) {
dev_err(&agdev->gadget->dev,
"%s:%d Error!\n", __func__, __LINE__);
req->status = 0;
}
}
return value;
}
static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_uac2_opts,
func_inst.group);
}
static void f_uac2_attr_release(struct config_item *item)
{
struct f_uac2_opts *opts = to_f_uac2_opts(item);
usb_put_function_instance(&opts->func_inst);
}
static struct configfs_item_operations f_uac2_item_ops = {
.release = f_uac2_attr_release,
};
#define uac2_kstrtou8 kstrtou8
#define uac2_kstrtou32 kstrtou32
#define uac2_kstrtos16 kstrtos16
#define uac2_kstrtobool(s, base, res) kstrtobool((s), (res))
static const char *u8_fmt = "%u\n";
static const char *u32_fmt = "%u\n";
static const char *s16_fmt = "%hd\n";
static const char *bool_fmt = "%u\n";
#define UAC2_ATTRIBUTE(type, name) \
static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
char *page) \
{ \
struct f_uac2_opts *opts = to_f_uac2_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_uac2_opts_##name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_uac2_opts *opts = to_f_uac2_opts(item); \
int ret; \
type num; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
ret = uac2_kstrto##type(page, 0, &num); \
if (ret) \
goto end; \
\
opts->name = num; \
ret = len; \
\
end: \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
CONFIGFS_ATTR(f_uac2_opts_, name)
#define UAC2_ATTRIBUTE_SYNC(name) \
static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
char *page) \
{ \
struct f_uac2_opts *opts = to_f_uac2_opts(item); \
int result; \
char *str; \
\
mutex_lock(&opts->lock); \
switch (opts->name) { \
case USB_ENDPOINT_SYNC_ASYNC: \
str = "async"; \
break; \
case USB_ENDPOINT_SYNC_ADAPTIVE: \
str = "adaptive"; \
break; \
default: \
str = "unknown"; \
break; \
} \
result = sprintf(page, "%s\n", str); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_uac2_opts *opts = to_f_uac2_opts(item); \
int ret = 0; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
if (!strncmp(page, "async", 5)) \
opts->name = USB_ENDPOINT_SYNC_ASYNC; \
else if (!strncmp(page, "adaptive", 8)) \
opts->name = USB_ENDPOINT_SYNC_ADAPTIVE; \
else { \
ret = -EINVAL; \
goto end; \
} \
\
ret = len; \
\
end: \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
CONFIGFS_ATTR(f_uac2_opts_, name)
#define UAC2_RATE_ATTRIBUTE(name) \
static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
char *page) \
{ \
struct f_uac2_opts *opts = to_f_uac2_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_uac2_opts_##name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_uac2_opts *opts = to_f_uac2_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_uac2_opts_, name)
#define UAC2_ATTRIBUTE_STRING(name) \
static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
char *page) \
{ \
struct f_uac2_opts *opts = to_f_uac2_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_uac2_opts_##name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_uac2_opts *opts = to_f_uac2_opts(item); \
int ret = 0; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
if (len && page[len - 1] == '\n') \
len--; \
\
ret = scnprintf(opts->name, min(sizeof(opts->name), len + 1), \
"%s", page); \
\
end: \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
CONFIGFS_ATTR(f_uac2_opts_, name)
UAC2_ATTRIBUTE(u32, p_chmask);
UAC2_RATE_ATTRIBUTE(p_srate);
UAC2_ATTRIBUTE(u32, p_ssize);
UAC2_ATTRIBUTE(u8, p_hs_bint);
UAC2_ATTRIBUTE(u32, c_chmask);
UAC2_RATE_ATTRIBUTE(c_srate);
UAC2_ATTRIBUTE_SYNC(c_sync);
UAC2_ATTRIBUTE(u32, c_ssize);
UAC2_ATTRIBUTE(u8, c_hs_bint);
UAC2_ATTRIBUTE(u32, req_number);
UAC2_ATTRIBUTE(bool, p_mute_present);
UAC2_ATTRIBUTE(bool, p_volume_present);
UAC2_ATTRIBUTE(s16, p_volume_min);
UAC2_ATTRIBUTE(s16, p_volume_max);
UAC2_ATTRIBUTE(s16, p_volume_res);
UAC2_ATTRIBUTE(bool, c_mute_present);
UAC2_ATTRIBUTE(bool, c_volume_present);
UAC2_ATTRIBUTE(s16, c_volume_min);
UAC2_ATTRIBUTE(s16, c_volume_max);
UAC2_ATTRIBUTE(s16, c_volume_res);
UAC2_ATTRIBUTE(u32, fb_max);
UAC2_ATTRIBUTE_STRING(function_name);
UAC2_ATTRIBUTE_STRING(if_ctrl_name);
UAC2_ATTRIBUTE_STRING(clksrc_in_name);
UAC2_ATTRIBUTE_STRING(clksrc_out_name);
UAC2_ATTRIBUTE_STRING(p_it_name);
UAC2_ATTRIBUTE_STRING(p_it_ch_name);
UAC2_ATTRIBUTE_STRING(p_ot_name);
UAC2_ATTRIBUTE_STRING(p_fu_vol_name);
UAC2_ATTRIBUTE_STRING(c_it_name);
UAC2_ATTRIBUTE_STRING(c_it_ch_name);
UAC2_ATTRIBUTE_STRING(c_ot_name);
UAC2_ATTRIBUTE_STRING(c_fu_vol_name);
UAC2_ATTRIBUTE(s16, p_terminal_type);
UAC2_ATTRIBUTE(s16, c_terminal_type);
static struct configfs_attribute *f_uac2_attrs[] = {
&f_uac2_opts_attr_p_chmask,
&f_uac2_opts_attr_p_srate,
&f_uac2_opts_attr_p_ssize,
&f_uac2_opts_attr_p_hs_bint,
&f_uac2_opts_attr_c_chmask,
&f_uac2_opts_attr_c_srate,
&f_uac2_opts_attr_c_ssize,
&f_uac2_opts_attr_c_hs_bint,
&f_uac2_opts_attr_c_sync,
&f_uac2_opts_attr_req_number,
&f_uac2_opts_attr_fb_max,
&f_uac2_opts_attr_p_mute_present,
&f_uac2_opts_attr_p_volume_present,
&f_uac2_opts_attr_p_volume_min,
&f_uac2_opts_attr_p_volume_max,
&f_uac2_opts_attr_p_volume_res,
&f_uac2_opts_attr_c_mute_present,
&f_uac2_opts_attr_c_volume_present,
&f_uac2_opts_attr_c_volume_min,
&f_uac2_opts_attr_c_volume_max,
&f_uac2_opts_attr_c_volume_res,
&f_uac2_opts_attr_function_name,
&f_uac2_opts_attr_if_ctrl_name,
&f_uac2_opts_attr_clksrc_in_name,
&f_uac2_opts_attr_clksrc_out_name,
&f_uac2_opts_attr_p_it_name,
&f_uac2_opts_attr_p_it_ch_name,
&f_uac2_opts_attr_p_ot_name,
&f_uac2_opts_attr_p_fu_vol_name,
&f_uac2_opts_attr_c_it_name,
&f_uac2_opts_attr_c_it_ch_name,
&f_uac2_opts_attr_c_ot_name,
&f_uac2_opts_attr_c_fu_vol_name,
&f_uac2_opts_attr_p_terminal_type,
&f_uac2_opts_attr_c_terminal_type,
NULL,
};
static const struct config_item_type f_uac2_func_type = {
.ct_item_ops = &f_uac2_item_ops,
.ct_attrs = f_uac2_attrs,
.ct_owner = THIS_MODULE,
};
static void afunc_free_inst(struct usb_function_instance *f)
{
struct f_uac2_opts *opts;
opts = container_of(f, struct f_uac2_opts, func_inst);
kfree(opts);
}
static struct usb_function_instance *afunc_alloc_inst(void)
{
struct f_uac2_opts *opts;
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
return ERR_PTR(-ENOMEM);
mutex_init(&opts->lock);
opts->func_inst.free_func_inst = afunc_free_inst;
config_group_init_type_name(&opts->func_inst.group, "",
&f_uac2_func_type);
opts->p_chmask = UAC2_DEF_PCHMASK;
opts->p_srates[0] = UAC2_DEF_PSRATE;
opts->p_ssize = UAC2_DEF_PSSIZE;
opts->p_hs_bint = UAC2_DEF_PHSBINT;
opts->c_chmask = UAC2_DEF_CCHMASK;
opts->c_srates[0] = UAC2_DEF_CSRATE;
opts->c_ssize = UAC2_DEF_CSSIZE;
opts->c_hs_bint = UAC2_DEF_CHSBINT;
opts->c_sync = UAC2_DEF_CSYNC;
opts->p_mute_present = UAC2_DEF_MUTE_PRESENT;
opts->p_volume_present = UAC2_DEF_VOLUME_PRESENT;
opts->p_volume_min = UAC2_DEF_MIN_DB;
opts->p_volume_max = UAC2_DEF_MAX_DB;
opts->p_volume_res = UAC2_DEF_RES_DB;
opts->c_mute_present = UAC2_DEF_MUTE_PRESENT;
opts->c_volume_present = UAC2_DEF_VOLUME_PRESENT;
opts->c_volume_min = UAC2_DEF_MIN_DB;
opts->c_volume_max = UAC2_DEF_MAX_DB;
opts->c_volume_res = UAC2_DEF_RES_DB;
opts->req_number = UAC2_DEF_REQ_NUM;
opts->fb_max = FBACK_FAST_MAX;
scnprintf(opts->function_name, sizeof(opts->function_name), "Source/Sink");
scnprintf(opts->if_ctrl_name, sizeof(opts->if_ctrl_name), "Topology Control");
scnprintf(opts->clksrc_in_name, sizeof(opts->clksrc_in_name), "Input Clock");
scnprintf(opts->clksrc_out_name, sizeof(opts->clksrc_out_name), "Output Clock");
scnprintf(opts->p_it_name, sizeof(opts->p_it_name), "USBD Out");
scnprintf(opts->p_it_ch_name, sizeof(opts->p_it_ch_name), "Capture Channels");
scnprintf(opts->p_ot_name, sizeof(opts->p_ot_name), "USBH In");
scnprintf(opts->p_fu_vol_name, sizeof(opts->p_fu_vol_name), "Capture Volume");
scnprintf(opts->c_it_name, sizeof(opts->c_it_name), "USBH Out");
scnprintf(opts->c_it_ch_name, sizeof(opts->c_it_ch_name), "Playback Channels");
scnprintf(opts->c_ot_name, sizeof(opts->c_ot_name), "USBD In");
scnprintf(opts->c_fu_vol_name, sizeof(opts->c_fu_vol_name), "Playback Volume");
opts->p_terminal_type = UAC2_DEF_P_TERM_TYPE;
opts->c_terminal_type = UAC2_DEF_C_TERM_TYPE;
return &opts->func_inst;
}
static void afunc_free(struct usb_function *f)
{
struct g_audio *agdev;
struct f_uac2_opts *opts;
agdev = func_to_g_audio(f);
opts = container_of(f->fi, struct f_uac2_opts, func_inst);
kfree(agdev);
mutex_lock(&opts->lock);
--opts->refcnt;
mutex_unlock(&opts->lock);
}
static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct g_audio *agdev = func_to_g_audio(f);
g_audio_cleanup(agdev);
usb_free_all_descriptors(f);
agdev->gadget = NULL;
kfree(out_feature_unit_desc);
out_feature_unit_desc = NULL;
kfree(in_feature_unit_desc);
in_feature_unit_desc = NULL;
}
static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
{
struct f_uac2 *uac2;
struct f_uac2_opts *opts;
uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
if (uac2 == NULL)
return ERR_PTR(-ENOMEM);
opts = container_of(fi, struct f_uac2_opts, func_inst);
mutex_lock(&opts->lock);
++opts->refcnt;
mutex_unlock(&opts->lock);
uac2->g_audio.func.name = "uac2_func";
uac2->g_audio.func.bind = afunc_bind;
uac2->g_audio.func.unbind = afunc_unbind;
uac2->g_audio.func.set_alt = afunc_set_alt;
uac2->g_audio.func.get_alt = afunc_get_alt;
uac2->g_audio.func.disable = afunc_disable;
uac2->g_audio.func.suspend = afunc_suspend;
uac2->g_audio.func.setup = afunc_setup;
uac2->g_audio.func.free_func = afunc_free;
return &uac2->g_audio.func;
}
DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
MODULE_DESCRIPTION("USB Audio Class 2.0 Function");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Yadwinder Singh");
MODULE_AUTHOR("Jaswinder Singh");
MODULE_AUTHOR("Ruslan Bilovol");
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