/usr/src/sys/dev/usb/uaudio.c

Bug Summary

File:	dev/usb/uaudio.c
Warning:	line 2675, column 16 Assigned value is garbage or undefined
Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.4 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name uaudio.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -ffp-contract=on -fno-rounding-math -mconstructor-aliases -ffreestanding -mcmodel=kernel -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -target-feature -sse2 -target-feature -sse -target-feature -3dnow -target-feature -mmx -target-feature +save-args -target-feature +retpoline-external-thunk -disable-red-zone -no-implicit-float -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -nostdsysteminc -nobuiltininc -resource-dir /usr/local/llvm16/lib/clang/16 -I /usr/src/sys -I /usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -I /usr/src/sys/arch -I /usr/src/sys/dev/pci/drm/include -I /usr/src/sys/dev/pci/drm/include/uapi -I /usr/src/sys/dev/pci/drm/amd/include/asic_reg -I /usr/src/sys/dev/pci/drm/amd/include -I /usr/src/sys/dev/pci/drm/amd/amdgpu -I /usr/src/sys/dev/pci/drm/amd/display -I /usr/src/sys/dev/pci/drm/amd/display/include -I /usr/src/sys/dev/pci/drm/amd/display/dc -I /usr/src/sys/dev/pci/drm/amd/display/amdgpu_dm -I /usr/src/sys/dev/pci/drm/amd/pm/inc -I /usr/src/sys/dev/pci/drm/amd/pm/legacy-dpm -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/inc -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu11 -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu12 -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu13 -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/inc -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/hwmgr -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/smumgr -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/inc -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/inc/pmfw_if -I /usr/src/sys/dev/pci/drm/amd/display/dc/inc -I /usr/src/sys/dev/pci/drm/amd/display/dc/inc/hw -I /usr/src/sys/dev/pci/drm/amd/display/dc/clk_mgr -I /usr/src/sys/dev/pci/drm/amd/display/modules/inc -I /usr/src/sys/dev/pci/drm/amd/display/modules/hdcp -I /usr/src/sys/dev/pci/drm/amd/display/dmub/inc -I /usr/src/sys/dev/pci/drm/i915 -D DDB -D DIAGNOSTIC -D KTRACE -D ACCOUNTING -D KMEMSTATS -D PTRACE -D POOL_DEBUG -D CRYPTO -D SYSVMSG -D SYSVSEM -D SYSVSHM -D UVM_SWAP_ENCRYPT -D FFS -D FFS2 -D FFS_SOFTUPDATES -D UFS_DIRHASH -D QUOTA -D EXT2FS -D MFS -D NFSCLIENT -D NFSSERVER -D CD9660 -D UDF -D MSDOSFS -D FIFO -D FUSE -D SOCKET_SPLICE -D TCP_ECN -D TCP_SIGNATURE -D INET6 -D IPSEC -D PPP_BSDCOMP -D PPP_DEFLATE -D PIPEX -D MROUTING -D MPLS -D BOOT_CONFIG -D USER_PCICONF -D APERTURE -D MTRR -D NTFS -D SUSPEND -D HIBERNATE -D PCIVERBOSE -D USBVERBOSE -D WSDISPLAY_COMPAT_USL -D WSDISPLAY_COMPAT_RAWKBD -D WSDISPLAY_DEFAULTSCREENS=6 -D X86EMU -D ONEWIREVERBOSE -D MULTIPROCESSOR -D MAXUSERS=80 -D _KERNEL -O2 -Wno-pointer-sign -Wno-address-of-packed-member -Wno-constant-conversion -Wno-unused-but-set-variable -Wno-gnu-folding-constant -fdebug-compilation-dir=/usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fcf-protection=branch -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -o /home/ben/Projects/scan/2024-01-11-110808-61670-1 -x c /usr/src/sys/dev/usb/uaudio.c
1/*	$OpenBSD: uaudio.c,v 1.174 2023/12/10 06:32:14 ratchov Exp $	*/
2/*
* Copyright (c) 2018 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
17/*
* The USB Audio Class (UAC) defines what is an audio device and how
* to use it. There are two versions of the UAC: v1.0 and v2.0. They
* are not compatible with each other but they are close enough to
* attempt to have the same driver for both.
*
*/
24#include <sys/param.h>
25#include <sys/types.h>
26#include <sys/device.h>
27#include <sys/errno.h>
28#include <sys/fcntl.h>
29#include <sys/malloc.h>
30#include <sys/systm.h>
31#include <sys/time.h>
32#include <sys/audioio.h>
33#include <machine/bus.h>
34#include <dev/audio_if.h>
35#include <dev/usb/usb.h>
36#include <dev/usb/usbdi.h>
37#include <dev/usb/usbdivar.h>
38#include <dev/usb/usb_mem.h>

40#ifdef UAUDIO_DEBUG
41#define DPRINTF(...)do {} while(0)				\
do {					\
if (uaudio_debug)		\
	printf(__VA_ARGS__);	\
} while (0)
46#else
47#define DPRINTF(...)do {} while(0) do {} while(0)
48#endif

50#define DEVNAME(sc)((sc)->dev.dv_xname) ((sc)->dev.dv_xname)

52/*
* Isochronous endpoint usage (XXX: these belong to dev/usb/usb.h).
*/
55#define UE_ISO_USAGE0x30			0x30
56#define  UE_ISO_USAGE_DATA0x00		0x00
57#define  UE_ISO_USAGE_FEEDBACK0x10		0x10
58#define  UE_ISO_USAGE_IMPL0x20		0x20
59#define UE_GET_ISO_USAGE(a)((a) & 0x30)		((a) & UE_ISO_USAGE0x30)

61/*
* Max length of unit names
*/
64#define UAUDIO_NAMEMAX16			MAX_AUDIO_DEV_LEN16

66/*
* USB audio class versions
*/
69#define UAUDIO_V10x100			0x100
70#define UAUDIO_V20x200			0x200

72/*
* AC class-specific descriptor interface sub-type
*/
75#define UAUDIO_AC_HEADER0x1		0x1
76#define UAUDIO_AC_INPUT0x2			0x2
77#define UAUDIO_AC_OUTPUT0x3		0x3
78#define UAUDIO_AC_MIXER0x4			0x4
79#define UAUDIO_AC_SELECTOR0x5		0x5
80#define UAUDIO_AC_FEATURE0x6		0x6
81#define UAUDIO_AC_EFFECT0x7		0x7
82#define UAUDIO_AC_PROCESSING0x8		0x8
83#define UAUDIO_AC_EXTENSION0x9		0x9
84#define UAUDIO_AC_CLKSRC0xa		0xa
85#define UAUDIO_AC_CLKSEL0xb		0xb
86#define UAUDIO_AC_CLKMULT0xc		0xc
87#define UAUDIO_AC_RATECONV0xd		0xd

89/*
* AS class-specific interface sub-types
*/
92#define UAUDIO_AS_GENERAL0x1		0x1
93#define UAUDIO_AS_FORMAT0x2		0x2

95/*
* AS class-specific endpoint sub-type
*/
98#define UAUDIO_EP_GENERAL0x1		0x1

100/*
* UAC v1 formats, wFormatTag is an enum
*/
103#define UAUDIO_V1_FMT_PCM0x1		0x1
104#define UAUDIO_V1_FMT_PCM80x2		0x2
105#define UAUDIO_V1_FMT_FLOAT0x3		0x3
106#define UAUDIO_V1_FMT_ALAW0x4		0x4
107#define UAUDIO_V1_FMT_MULAW0x5		0x5

109/*
* UAC v2 formats, bmFormats is a bitmap
*/
112#define UAUDIO_V2_FMT_PCM0x01		0x01
113#define UAUDIO_V2_FMT_PCM80x02		0x02
114#define UAUDIO_V2_FMT_FLOAT0x04		0x04
115#define UAUDIO_V2_FMT_ALAW0x08		0x08
116#define UAUDIO_V2_FMT_MULAW0x10		0x10

118/*
* AC requests
*/
121#define UAUDIO_V1_REQ_SET_CUR0x01		0x01
122#define UAUDIO_V1_REQ_SET_MIN0x02		0x02
123#define UAUDIO_V1_REQ_SET_MAX0x03		0x03
124#define UAUDIO_V1_REQ_SET_RES0x04		0x04
125#define UAUDIO_V1_REQ_GET_CUR0x81		0x81
126#define UAUDIO_V1_REQ_GET_MIN0x82		0x82
127#define UAUDIO_V1_REQ_GET_MAX0x83		0x83
128#define UAUDIO_V1_REQ_GET_RES0x84		0x84
129#define UAUDIO_V2_REQ_CUR1		1
130#define UAUDIO_V2_REQ_RANGES2		2

132/*
* AC request "selector control"
*/
135#define UAUDIO_V2_REQSEL_CLKFREQ1	1
136#define UAUDIO_V2_REQSEL_CLKSEL1		1

138/*
* AS class-specific endpoint attributes
*/
141#define UAUDIO_EP_FREQCTL0x01		0x01

143/*
* AC feature control selectors (aka wValue in the request)
*/
146#define UAUDIO_REQSEL_MUTE0x01		0x01
147#define UAUDIO_REQSEL_VOLUME0x02		0x02
148#define UAUDIO_REQSEL_BASS0x03		0x03
149#define UAUDIO_REQSEL_MID0x04		0x04
150#define UAUDIO_REQSEL_TREBLE0x05		0x05
151#define UAUDIO_REQSEL_EQ0x06		0x06
152#define UAUDIO_REQSEL_AGC0x07		0x07
153#define UAUDIO_REQSEL_DELAY0x08		0x08
154#define UAUDIO_REQSEL_BASSBOOST0x09		0x09
155#define UAUDIO_REQSEL_LOUDNESS0x0a		0x0a
156#define UAUDIO_REQSEL_GAIN0x0b		0x0b
157#define UAUDIO_REQSEL_GAINPAD0x0c		0x0c
158#define UAUDIO_REQSEL_PHASEINV0x0d		0x0d

160/*
* Endpoint (UAC v1) or clock-source unit (UAC v2) sample rate control
*/
163#define UAUDIO_REQSEL_RATE0x01		0x01

165/*
* Samples-per-frame are fractions. UAC v2.0 requires the denominator to
* be multiple of 2^16, as used in the sync pipe. On the other hand, to
* represent sample-per-frame of all rates we support, we need the
* denominator to be such that (rate / 1000) can be represented exactly,
* 80 works. So we use the least common multiplier of both.
*/
172#define UAUDIO_SPF_DIV327680			327680

174/*
* names of DAC and ADC unit names
*/
177#define UAUDIO_NAME_PLAY"dac"	"dac"
178#define UAUDIO_NAME_REC"record"		"record"

180/*
* read/write pointers for secure sequential access of binary data,
* ex. usb descriptors, tables and alike. Bytes are read using the
* read pointer up to the write pointer.
*/
185struct uaudio_blob {
unsigned char *rptr, *wptr;
187};

189/*
* Ranges of integer values used to represent controls values and
* sample frequencies.
*/
193struct uaudio_ranges {
unsigned int nval;
struct uaudio_ranges_el {
struct uaudio_ranges_el *next;
int min, max, res;
} *el;
199};

201struct uaudio_softc {
struct device dev;
struct usbd_device *udev;
int version;

/*
* UAC exposes the device as a circuit of units. Input and
* output jacks are known as terminal units, others are
* processing units. The purpose of this driver is to give
* them reasonable names and expose them as mixer(1)
* controls. Control names are derived from the type of the
* unit and its role in the circuit.
*
* UAC v2.0 exposes also the clock circuitry using units, so
* selecting the sample rate also involves units usage.
*/
struct uaudio_unit {
struct uaudio_unit *unit_next, *src_next, *dst_next;
struct uaudio_unit *src_list, *dst_list;
char name[UAUDIO_NAMEMAX16];
unsigned int nch;
int type, id;

/* terminal or clock type */
unsigned int term;

/* clock source, if a terminal or selector */
struct uaudio_unit *clock;

/* sample rates, if this is a clock source */
struct uaudio_ranges rates;

/* mixer(4) bits */
234#define UAUDIO_CLASS_OUT0	0
235#define UAUDIO_CLASS_IN1		1
236#define UAUDIO_CLASS_COUNT2	2
int mixer_class;
struct uaudio_mixent {
	struct uaudio_mixent *next;
	char *fname;
241#define UAUDIO_MIX_SW0	0
242#define UAUDIO_MIX_NUM1	1
243#define UAUDIO_MIX_ENUM2	2
	int type;
	int chan;
	int req_sel;
	struct uaudio_ranges ranges;
} *mixent_list;
} *unit_list;

/*
* Current clock, UAC v2.0 only
*/
struct uaudio_unit *clock;

/*
* Number of input and output terminals
*/
unsigned int nin, nout;

/*
* When unique names are needed, they are generated using a
* base string suffixed with a number. Ex. "spkr5". The
* following structure is used to keep track of strings we
* allocated.
*/
struct uaudio_name {
struct uaudio_name *next;
char *templ;
unsigned int unit;
} *names;

/*
* Audio streaming (AS) alternate settings, i.e. stream format
* and USB-related parameters to use it.
*/
struct uaudio_alt {
struct uaudio_alt *next;
int ifnum, altnum;
int mode;		/* one of AUMODE_{RECORD,PLAY} */
int data_addr;		/* data endpoint address */
int sync_addr;		/* feedback endpoint address */
int maxpkt;		/* max supported bytes per frame */
int fps;		/* USB (micro-)frames per second */
int bps, bits, nch;	/* audio encoding */
int v1_rates;		/* if UAC 1.0, bitmap of rates */
} *alts;

/*
* Audio parameters: play and record stream formats usable
* together.
*/
struct uaudio_params {
struct uaudio_params *next;
struct uaudio_alt *palt, *ralt;
int v1_rates;
} *params_list, *params;

/*
* One direction audio stream, aka "DMA" in progress
*/
struct uaudio_stream {
303#define UAUDIO_NXFERS_MIN2	2
304#define UAUDIO_NXFERS_MAX8	8
struct uaudio_xfer {
	struct usbd_xfer *usb_xfer;
	unsigned char *buf;
	uint16_t *sizes;
	unsigned int size;	/* bytes requested */
	unsigned int nframes;	/* frames requested */
} data_xfers[UAUDIO_NXFERS_MAX8], sync_xfers[UAUDIO_NXFERS_MAX8];

/*
 * We don't use all the data_xfers[] entries because
 * we can't schedule too many frames in the usb
 * controller.
 */
unsigned int nxfers;

unsigned int spf_remain;	/* frac sample left */
unsigned int spf;		/* avg samples per frame */
unsigned int spf_min, spf_max;	/* allowed boundaries */

/*
 * The max frame size we'll need (which may be lower
 * than the maxpkt the usb pipe supports).
 */
unsigned int maxpkt;

/*
 * max number of frames per xfer we'll need
 */
unsigned int nframes_max;

/*
 * At usb2.0 speed, the number of (micro-)frames per
 * transfer must correspond to 1ms, which is the usb1.1
 * frame duration. This is required by lower level usb
 * drivers.
 *
 * The nframes_mask variable is used to test if the
 * number of frames per transfer is usable (by checking
 * that least significant bits are zero). For instance,
 * nframes_mask will be set to 0x0 on usb1.1 device and
 * 0x7 on usb2.0 devices running at 8000 fps.
 */
unsigned int nframes_mask;

unsigned int data_nextxfer, sync_nextxfer;
struct usbd_pipe *data_pipe;
struct usbd_pipe *sync_pipe;
void (*intr)(void *);
void *arg;

/* audio ring extents, passed to trigger() methods */
unsigned char *ring_start, *ring_end;

/* pointer to first byte available */
unsigned char *ring_pos;

/* audio(9) block size in bytes */
int ring_blksz;

/* xfer position relative to block boundary */
int ring_offs;

/*
 * As USB sample-per-frame is not constant, we must
 * schedule transfers slightly larger that one audio
 * block. This is the "safe" block size, that ensures
 * the transfer will cross the audio block boundary.
 */
int safe_blksz;

/*
 * Number of bytes completed, when it reaches a
 * block size, we fire an audio(9) interrupt.
 */
int ring_icnt;

/*
 * USB transfers are used as a FIFO which is the
 * concatenation of all transfers. This is the write
 * (read) position of the play (rec) stream
 */
unsigned int ubuf_xfer;		/* xfer index */
unsigned int ubuf_pos;		/* offset in bytes */
} pstream, rstream;

int ctl_ifnum;			/* aka AC interface */

int mode;			/* open() mode */
int trigger_mode;		/* trigger() mode */

unsigned int rate;		/* current sample rate */
unsigned int ufps;		/* USB frames per second */
unsigned int sync_pktsz;	/* size of sync packet */
unsigned int host_nframes;	/* max frames we can schedule */

int diff_nsamp;			/* samples play is ahead of rec */
int diff_nframes;		/* frames play is ahead of rec */
unsigned int adjspf_age;	/* frames since last uaudio_adjspf */

/*
* bytes pending to be copied to transfer buffer. This is play
* only, as recorded frames are copied as soon they are
* received.
*/
size_t copy_todo;
410};

412int uaudio_match(struct device *, void *, void *);
413void uaudio_attach(struct device *, struct device *, void *);
414int uaudio_detach(struct device *, int);

416int uaudio_open(void *, int);
417void uaudio_close(void *);
418int uaudio_set_params(void *, int, int, struct audio_params *,
  struct audio_params *);
420unsigned int uaudio_set_blksz(void *, int,
  struct audio_params *, struct audio_params *, unsigned int);
422int uaudio_trigger_output(void *, void *, void *, int,
  void (*)(void *), void *, struct audio_params *);
424int uaudio_trigger_input(void *, void *, void *, int,
  void (*)(void *), void *, struct audio_params *);
426void uaudio_copy_output(void *, size_t);
427void uaudio_underrun(void *);
428int uaudio_halt_output(void *);
429int uaudio_halt_input(void *);
430int uaudio_query_devinfo(void *, struct mixer_devinfo *);
431int uaudio_get_port(void *, struct mixer_ctrl *);
432int uaudio_set_port(void *, struct mixer_ctrl *);

434int uaudio_process_unit(struct uaudio_softc *,
  struct uaudio_unit *, int,
  struct uaudio_blob,
  struct uaudio_unit **);

439void uaudio_pdata_intr(struct usbd_xfer *, void *, usbd_status);
440void uaudio_rdata_intr(struct usbd_xfer *, void *, usbd_status);
441void uaudio_psync_intr(struct usbd_xfer *, void *, usbd_status);

443#ifdef UAUDIO_DEBUG
444char *uaudio_isoname(int isotype);
445char *uaudio_modename(int mode);
446char *uaudio_usagename(int usage);
447void uaudio_rates_print(int rates);
448void uaudio_ranges_print(struct uaudio_ranges *r);
449void uaudio_print_unit(struct uaudio_softc *sc, struct uaudio_unit *u);
450void uaudio_mixer_print(struct uaudio_softc *sc);
451void uaudio_conf_print(struct uaudio_softc *sc);

453/*
* 0 - nothing, same as if UAUDIO_DEBUG isn't defined
* 1 - initialisations & setup
* 2 - audio(4) calls
* 3 - transfers
*/
459int uaudio_debug = 1;
460#endif

462struct cfdriver uaudio_cd = {
NULL((void *)0), "uaudio", DV_DULL
464};

466const struct cfattach uaudio_ca = {
sizeof(struct uaudio_softc), uaudio_match, uaudio_attach, uaudio_detach
468};

470const struct audio_hw_if uaudio_hw_if = {
.open = uaudio_open,
.close = uaudio_close,
.set_params = uaudio_set_params,
.halt_output = uaudio_halt_output,
.halt_input = uaudio_halt_input,
.set_port = uaudio_set_port,
.get_port = uaudio_get_port,
.query_devinfo = uaudio_query_devinfo,
.trigger_output = uaudio_trigger_output,
.trigger_input = uaudio_trigger_input,
.copy_output = uaudio_copy_output,
.underrun = uaudio_underrun,
.set_blksz = uaudio_set_blksz,
484};

486/*
* To keep things simple, we support only the following rates, we
* don't care about continuous sample rates or other "advanced"
* features which complicate implementation.
*/
491const int uaudio_rates[] = {
8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000,
64000, 88200, 96000, 128000, 176400, 192000
494};

496/*
* Convert 8, 16, or 24-bit signed value to an int by expanding the
* sign bit.
*/
500int
501uaudio_sign_expand(unsigned int val, int opsize)
502{
unsigned int s;

s = 1 << (8 * opsize - 1);
return (val ^ s) - s;
507}

509int
510uaudio_req(struct uaudio_softc *sc,
  unsigned int type,
  unsigned int req,
  unsigned int sel,
  unsigned int chan,
  unsigned int ifnum,
  unsigned int id,
  unsigned char *buf,
  size_t size)
519{
struct usb_device_request r;
int err;

r.bmRequestType = type;
r.bRequest = req;
USETW(r.wValue, sel << 8 | chan)(*(u_int16_t *)(r.wValue) = (sel << 8 | chan));
USETW(r.wIndex, id << 8 | ifnum)(*(u_int16_t *)(r.wIndex) = (id << 8 | ifnum));
USETW(r.wLength, size)(*(u_int16_t *)(r.wLength) = (size));

DPRINTF("%s: type = 0x%x, req = 0x%x, val = 0x%x, "do {} while(0)
   "index = 0x%x, size = %d\n", __func__,do {} while(0)
   type, req, UGETW(r.wValue), UGETW(r.wIndex), UGETW(r.wLength))do {} while(0);

err = usbd_do_request(sc->udev, &r, buf);
if (err) {
DPRINTF("%s: failed: %s\n", __func__, usbd_errstr(err))do {} while(0);
return 0;
}
return 1;
539}

541/*
* Read a number of the given size (in bytes) from the given
* blob. Return 0 on error.
*/
545int
546uaudio_getnum(struct uaudio_blob *p, unsigned int size, unsigned int *ret)
547{
unsigned int i, num = 0;

if (p->wptr - p->rptr < size) {
DPRINTF("%s: %d: too small\n", __func__, size)do {} while(0);
return 0;
}

for (i = 0; i < size; i++)
num |= *p->rptr++ << (8 * i);

if (ret)
*ret = num;
return 1;
561}

563/*
* Read a USB descriptor from the given blob. Return 0 on error.
*/
566int
567uaudio_getdesc(struct uaudio_blob *p, struct uaudio_blob *ret)
568{
unsigned int size;

if (!uaudio_getnum(p, 1, &size))
return 0;
if (size-- == 0) {
DPRINTF("%s: zero sized desc\n", __func__)do {} while(0);
return 0;
}
if (p->wptr - p->rptr < size) {
DPRINTF("%s: too small\n", __func__)do {} while(0);
return 0;
}
ret->rptr = p->rptr;
ret->wptr = p->rptr + size;
p->rptr += size;
return 1;
585}

587/*
* Find the unit with the given id, return NULL if not found.
*/
590struct uaudio_unit *
591uaudio_unit_byid(struct uaudio_softc *sc, unsigned int id)
592{
struct uaudio_unit *u;

for (u = sc->unit_list; u != NULL((void *)0); u = u->unit_next) {
if (u->id == id)
	break;
}
return u;
600}

602/*
* Return a terminal name for the given terminal type.
*/
605char *
606uaudio_tname(struct uaudio_softc *sc, unsigned int type, int isout)
607{
unsigned int hi, lo;
char *name;

hi = type >> 8;
lo = type & 0xff;

/* usb data stream */
if (hi == 1)
return isout ? UAUDIO_NAME_REC"record" : UAUDIO_NAME_PLAY"dac";

/* if there is only one input (output) use "input" ("output") */
if (isout) {
if (sc->nout == 1)
	return "output";
} else {
if (sc->nin == 1)
	return "input";
}

/* determine name from USB terminal type */
switch (hi) {
case 2:
/* embedded inputs */
name = isout ? "mic-out" : "mic";
break;
case 3:
/* embedded outputs, mostly speakers, except 0x302 */
switch (lo) {
case 0x02:
	name = isout ? "hp" : "hp-in";
	break;
default:
	name = isout ? "spkr" : "spkr-in";
	break;
}
break;
case 4:
/* handsets and headset */
name = isout ? "spkr" : "mic";
break;
case 5:
/* phone line */
name = isout ? "phone-in" : "phone-out";
break;
case 6:
/* external sources/sinks */
switch (lo) {
case 0x02:
case 0x05:
case 0x06:
case 0x07:
case 0x09:
case 0x0a:
	name = isout ? "dig-out" : "dig-in";
	break;
default:
	name = isout ? "line-out" : "line-in";
	break;
}
break;
case 7:
/* internal devices */
name = isout ? "int-out" : "int-in";
break;
default:
name = isout ? "unk-out" : "unk-in";
}
return name;
676}

678/*
* Return a clock name for the given clock type.
*/
681char *
682uaudio_clkname(unsigned int attr)
683{
static char *names[] = {"ext", "fixed", "var", "prog"};

return names[attr & 3];
687}

689/*
* Return an unique name for the given template.
*/
692void
693uaudio_mkname(struct uaudio_softc *sc, char *templ, char *res)
694{
struct uaudio_name *n;
char *sep;

/*
* if this is not a terminal name (i.e. there's a underscore
* in the name, like in "spkr2_mic3"), then use underscore as
* separator to avoid concatenating two numbers
*/
sep = strchr(templ, '_') != NULL((void *)0) ? "_" : "";

n = sc->names;
while (1) {
if (n == NULL((void *)0)) {
	n = malloc(sizeof(struct uaudio_name),
	    M_USBDEV102, M_WAITOK0x0001);
	n->templ = templ;
	n->unit = 0;
	n->next = sc->names;
	sc->names = n;
}
if (strcmp(n->templ, templ) == 0)
	break;
n = n->next;
}
if (n->unit == 0)
snprintf(res, UAUDIO_NAMEMAX16, "%s", templ);
else
snprintf(res, UAUDIO_NAMEMAX16, "%s%s%u", templ, sep, n->unit);
n->unit++;
724}

726/*
* Convert UAC v1.0 feature bitmap to UAC v2.0 feature bitmap.
*/
729unsigned int
730uaudio_feature_fixup(struct uaudio_softc *sc, unsigned int ctl)
731{
int i;
unsigned int bits, n;

switch (sc->version) {
case UAUDIO_V10x100:
n = 0;
for (i = 0; i < 16; i++) {
	bits = (ctl >> i) & 1;
	if (bits)
		bits |= 2;
	n |= bits << (2 * i);
}
return n;
case UAUDIO_V20x200:
break;
}
return ctl;
749}

751/*
* Initialize a uaudio_ranges to the empty set
*/
754void
755uaudio_ranges_init(struct uaudio_ranges *r)
756{
r->el = NULL((void *)0);
r->nval = 0;
759}

761/*
* Add the given range to the uaudio_ranges structures. Ranges are
* not supposed to overlap (required by USB spec). If they do we just
* return.
*/
766void
767uaudio_ranges_add(struct uaudio_ranges *r, int min, int max, int res)
768{
struct uaudio_ranges_el *e, **pe;

if (min > max) {
DPRINTF("%s: [%d:%d]/%d: bad range\n", __func__,do {} while(0)
    min, max, res)do {} while(0);
return;
}

for (pe = &r->el; (e = *pe) != NULL((void *)0); pe = &e->next) {
if (min <= e->max && max >= e->min) {
	DPRINTF("%s: overlapping ranges\n", __func__)do {} while(0);
	return;
}
if (min < e->max)
	break;
}

/* XXX: use 'res' here */
r->nval += max - min + 1;

e = malloc(sizeof(struct uaudio_ranges_el), M_USBDEV102, M_WAITOK0x0001);
e->min = min;
e->max = max;
e->res = res;
e->next = *pe;
*pe = e;
795}

797/*
* Free all ranges making the uaudio_ranges the empty set
*/
800void
801uaudio_ranges_clear(struct uaudio_ranges *r)
802{
struct uaudio_ranges_el *e;

while ((e = r->el) != NULL((void *)0)) {
r->el = e->next;
free(e, M_USBDEV102, sizeof(struct uaudio_ranges_el));
}
r->nval = 0;
810}

812/*
* Convert a value in the given uaudio_ranges, into a 0..255 integer
* suitable for mixer usage
*/
816int
817uaudio_ranges_decode(struct uaudio_ranges *r, int val)
818{
struct uaudio_ranges_el *e;
int diff, pos;

pos = 0;

for (e = r->el; e != NULL((void *)0); e = e->next) {
if (val >= e->min && val <= e->max) {
	pos += val - e->min;
	return (r->nval == 1) ? 0 :
	    (pos * 255 + (r->nval - 1) / 2) / (r->nval - 1);
}
diff = e->max - e->min + 1;
pos += diff;
}
return 0;
834}

836/*
* Convert a 0..255 to a value in the uaudio_ranges suitable for a USB
* request.
*/
840unsigned int
841uaudio_ranges_encode(struct uaudio_ranges *r, int val)
842{
struct uaudio_ranges_el *e;
int diff, pos;

pos = (val * (r->nval - 1) + 127) / 255;

for (e = r->el; e != NULL((void *)0); e = e->next) {
diff = e->max - e->min + 1;
if (pos < diff)
	return e->min + pos;
pos -= diff;
}
return 0;
855}

857/*
* Return the bitmap of supported rates included in the given ranges.
* This is not a mixer thing, UAC v2.0 uses ranges to report sample
* rates.
*/
862int
863uaudio_ranges_getrates(struct uaudio_ranges *r,
  unsigned int mult, unsigned int div)
865{
struct uaudio_ranges_el *e;
int rates, i, v;

rates = 0;

for (e = r->el; e != NULL((void *)0); e = e->next) {
for (i = 0; i < nitems(uaudio_rates)(sizeof((uaudio_rates)) / sizeof((uaudio_rates)[0])); i++) {
	v = (unsigned long long)uaudio_rates[i] * mult / div;
	if (v < e->min || v > e->max)
		continue;
	if (e->res == 0 || v - e->min % e->res == 0)
		rates |= 1 << i;
}
}

return rates;
882}

884/*
* Return the index in the uaudio_rates[] array of rate closest to the
* given rate in Hz.
*/
888int
889uaudio_rates_indexof(int mask, int rate)
890{
int i, diff, best_index, best_diff;

best_index = -1;
best_diff = INT_MAX0x7fffffff;
for (i = 0; i < nitems(uaudio_rates)(sizeof((uaudio_rates)) / sizeof((uaudio_rates)[0])); i++) {
if ((mask & (1 << i)) == 0)
	continue;
diff = uaudio_rates[i] - rate;
if (diff < 0)
	diff = -diff;
if (diff < best_diff) {
	best_index = i;
	best_diff = diff;
}
}
return best_index;
907}

909/*
* Do a request that results in a uaudio_ranges. On UAC v1.0, this is
* simply a min/max/res triplet. On UAC v2.0, this is an array of
* min/max/res triplets.
*/
914int
915uaudio_req_ranges(struct uaudio_softc *sc,
  unsigned int opsize,
  unsigned int sel,
  unsigned int chan,
  unsigned int ifnum,
  unsigned int id,
  struct uaudio_ranges *r)
922{
unsigned char req_buf[16], *req = NULL((void *)0);
size_t req_size;
struct uaudio_blob p;
unsigned int count, min, max, res;
int i;

switch (sc->version) {
case UAUDIO_V10x100:
count = 1;
req = req_buf;
p.rptr = p.wptr = req;
if (!uaudio_req(sc, UT_READ_CLASS_INTERFACE(0x80 | 0x20 | 0x01),
	UAUDIO_V1_REQ_GET_MIN0x82, sel, chan,
	ifnum, id, p.wptr, opsize))
	return 0;
p.wptr += opsize;
if (!uaudio_req(sc, UT_READ_CLASS_INTERFACE(0x80 | 0x20 | 0x01),
	UAUDIO_V1_REQ_GET_MAX0x83, sel, chan,
	ifnum, id, p.wptr, opsize))
	return 0;
p.wptr += opsize;
if (!uaudio_req(sc, UT_READ_CLASS_INTERFACE(0x80 | 0x20 | 0x01),
	UAUDIO_V1_REQ_GET_RES0x84, sel, chan,
	ifnum, id, p.wptr, opsize))
	return 0;
p.wptr += opsize;
break;
case UAUDIO_V20x200:
/* fetch the ranges count only (first 2 bytes) */
if (!uaudio_req(sc, UT_READ_CLASS_INTERFACE(0x80 | 0x20 | 0x01),
	UAUDIO_V2_REQ_RANGES2, sel, chan,
	ifnum, id, req_buf, 2))
	return 0;

/* count is at most 65535 */
count = req_buf[0] | req_buf[1] << 8;

/* restart the request on a large enough buffer */
req_size = 2 + 3 * opsize * count;
if (sizeof(req_buf) >= req_size)
	req = req_buf;
else
	req = malloc(req_size, M_USBDEV102, M_WAITOK0x0001);

p.rptr = p.wptr = req;
if (!uaudio_req(sc, UT_READ_CLASS_INTERFACE(0x80 | 0x20 | 0x01),
	UAUDIO_V2_REQ_RANGES2, sel, chan,
	ifnum, id, p.wptr, req_size))
	return 0;
p.wptr += req_size;

/* skip initial 2 bytes of count */
p.rptr += 2;
break;
}

for (i = 0; i < count; i++) {
if (!uaudio_getnum(&p, opsize, &min))
	return 0;
if (!uaudio_getnum(&p, opsize, &max))
	return 0;
if (!uaudio_getnum(&p, opsize, &res))
	return 0;
uaudio_ranges_add(r,
    uaudio_sign_expand(min, opsize),
    uaudio_sign_expand(max, opsize),
    uaudio_sign_expand(res, opsize));
}

if (req != req_buf)
free(req, M_USBDEV102, req_size);

return 1;
996}

998/*
* Return the rates bitmap of the given interface alt setting
*/
1001int
1002uaudio_alt_getrates(struct uaudio_softc *sc, struct uaudio_alt *p)
1003{
struct uaudio_unit *u;
unsigned int mult = 1, div = 1;

switch (sc->version) {
case UAUDIO_V10x100:
return p->v1_rates;
case UAUDIO_V20x200:
u = sc->clock;
while (1) {
	switch (u->type) {
	case UAUDIO_AC_CLKSRC0xa:
		return uaudio_ranges_getrates(&u->rates,
		    mult, div);
	case UAUDIO_AC_CLKSEL0xb:
		u = u->clock;
		break;
	case UAUDIO_AC_CLKMULT0xc:
	case UAUDIO_AC_RATECONV0xd:
		/* XXX: adjust rate with multiplier */
		u = u->src_list;
		break;
	default:
		DPRINTF("%s: no clock\n", __func__)do {} while(0);
		return 0;
	}
}
}
return 0;
1032}

1034/*
* return the clock unit of the given terminal unit (v2 only)
*/
1037int
1038uaudio_clock_id(struct uaudio_softc *sc)
1039{
struct uaudio_unit *u;

u = sc->clock;
while (1) {
if (u == NULL((void *)0)) {
	DPRINTF("%s: NULL clock pointer\n", __func__)do {} while(0);
	return -1;
}
switch (u->type) {
case UAUDIO_AC_CLKSRC0xa:
	return u->id;
case UAUDIO_AC_CLKSEL0xb:
	u = u->clock;
	break;
case UAUDIO_AC_CLKMULT0xc:
case UAUDIO_AC_RATECONV0xd:
	u = u->src_list;
	break;
default:
	DPRINTF("%s: no clock\n", __func__)do {} while(0);
	return -1;
}
}
1063}

1065/*
* Return the rates bitmap of the given parameters setting
*/
1068int
1069uaudio_getrates(struct uaudio_softc *sc, struct uaudio_params *p)
1070{
switch (sc->version) {
case UAUDIO_V10x100:
return p->v1_rates;
case UAUDIO_V20x200:
return uaudio_alt_getrates(sc, p->palt ? p->palt : p->ralt);
}
return 0;
1078}

1080/*
* Add the given feature (aka mixer control) to the given unit.
*/
1083void
1084uaudio_feature_addent(struct uaudio_softc *sc,
  struct uaudio_unit *u, int uac_type, int chan)
1086{
static struct {
char *name;
int mix_type;
int req_sel;
} features[] = {
{"mute", UAUDIO_MIX_SW0, UAUDIO_REQSEL_MUTE0x01},
{"level", UAUDIO_MIX_NUM1, UAUDIO_REQSEL_VOLUME0x02},
{"bass", UAUDIO_MIX_NUM1, UAUDIO_REQSEL_BASS0x03},
{"mid", UAUDIO_MIX_NUM1, UAUDIO_REQSEL_MID0x04},
{"treble", UAUDIO_MIX_NUM1, UAUDIO_REQSEL_TREBLE0x05},
{"eq", UAUDIO_MIX_NUM1, UAUDIO_REQSEL_EQ0x06},
{"agc", UAUDIO_MIX_SW0, UAUDIO_REQSEL_AGC0x07},
{NULL((void *)0), -1, -1},			/* delay */
{"bassboost", UAUDIO_MIX_SW0, UAUDIO_REQSEL_BASSBOOST0x09},
{"loud", UAUDIO_MIX_SW0, UAUDIO_REQSEL_LOUDNESS0x0a},
{"gain", UAUDIO_MIX_NUM1, UAUDIO_REQSEL_GAIN0x0b},
{"gainpad", UAUDIO_MIX_SW0, UAUDIO_REQSEL_GAINPAD0x0c},
{"phase", UAUDIO_MIX_SW0, UAUDIO_REQSEL_PHASEINV0x0d},
{NULL((void *)0), -1, -1},			/* underflow */
{NULL((void *)0), -1, -1}			/* overflow */
};
struct uaudio_mixent *m, *i, **pi;
int cmp;

if (uac_type >= sizeof(features) / sizeof(features[0])) {
printf("%s: skipped unknown feature\n", DEVNAME(sc)((sc)->dev.dv_xname));
return;
}

m = malloc(sizeof(struct uaudio_mixent), M_USBDEV102, M_WAITOK0x0001);
m->chan = chan;
m->fname = features[uac_type].name;
m->type = features[uac_type].mix_type;
m->req_sel = features[uac_type].req_sel;
uaudio_ranges_init(&m->ranges);

if (m->type == UAUDIO_MIX_NUM1) {
if (!uaudio_req_ranges(sc, 2,
	m->req_sel, chan < 0 ? 0 : chan + 1,
	sc->ctl_ifnum, u->id,
	&m->ranges)) {
	printf("%s: failed to get ranges for %s control\n",
	    DEVNAME(sc)((sc)->dev.dv_xname), m->fname);
	free(m, M_USBDEV102, sizeof(struct uaudio_mixent));
	return;
}
if (m->ranges.el == NULL((void *)0)) {
	printf("%s: skipped %s control with empty range\n",
	    DEVNAME(sc)((sc)->dev.dv_xname), m->fname);
	free(m, M_USBDEV102, sizeof(struct uaudio_mixent));
	return;
}
1139#ifdef UAUDIO_DEBUG
if (uaudio_debug)
	uaudio_ranges_print(&m->ranges);
1142#endif
}

/*
* Add to unit's mixer controls list, sorting entries by name
* and increasing channel number.
*/
for (pi = &u->mixent_list; (i = *pi) != NULL((void *)0); pi = &i->next) {
cmp = strcmp(i->fname, m->fname);
if (cmp == 0)
	cmp = i->chan - m->chan;
if (cmp == 0) {
	DPRINTF("%02u: %s.%s: duplicate feature for chan %d\n",do {} while(0)
	    u->id, u->name, m->fname, m->chan)do {} while(0);
	free(m, M_USBDEV102, sizeof(struct uaudio_mixent));
	return;
}
if (cmp > 0)
	break;
}
m->next = *pi;
*pi = m;

DPRINTF("\t%s[%d]\n", m->fname, m->chan)do {} while(0);
1166}

1168/*
* For the given unit, parse the list of its sources and recursively
* call uaudio_process_unit() for each.
*/
1172int
1173uaudio_process_srcs(struct uaudio_softc *sc,
struct uaudio_unit *u, struct uaudio_blob units,
struct uaudio_blob *p)
1176{
struct uaudio_unit *s, **ps;
unsigned int i, npin, sid;

if (!uaudio_getnum(p, 1, &npin))
return 0;
ps = &u->src_list;
for (i = 0; i < npin; i++) {
if (!uaudio_getnum(p, 1, &sid))
	return 0;
if (!uaudio_process_unit(sc, u, sid, units, &s))
	return 0;
s->src_next = NULL((void *)0);
*ps = s;
ps = &s->src_next;
}
return 1;
1193}

1195/*
* Parse the number of channels.
*/
1198int
1199uaudio_process_nch(struct uaudio_softc *sc,
struct uaudio_unit *u, struct uaudio_blob *p)
1201{
if (!uaudio_getnum(p, 1, &u->nch))
return 0;
/* skip junk */
switch (sc->version) {
case UAUDIO_V10x100:
if (!uaudio_getnum(p, 2, NULL((void *)0))) /* bmChannelConfig */
	return 0;
break;
case UAUDIO_V20x200:
if (!uaudio_getnum(p, 4, NULL((void *)0))) /* wChannelConfig */
	return 0;
break;
}
if (!uaudio_getnum(p, 1, NULL((void *)0))) /* iChannelNames */
return 0;
return 1;
1218}

1220/*
* Find the AC class-specific descriptor for this unit id.
*/
1223int
1224uaudio_unit_getdesc(struct uaudio_softc *sc, int id,
struct uaudio_blob units,
struct uaudio_blob *p,
unsigned int *rtype)
1228{
unsigned int i, type, subtype;

/*
* Find the usb descriptor for this id.
*/
while (1) {
if (units.rptr == units.wptr) {
	DPRINTF("%s: %02u: not found\n", __func__, id)do {} while(0);
	return 0;
}
if (!uaudio_getdesc(&units, p))
	return 0;
if (!uaudio_getnum(p, 1, &type))
	return 0;
if (!uaudio_getnum(p, 1, &subtype))
	return 0;
if (!uaudio_getnum(p, 1, &i))
	return 0;
if (i == id)
	break;
}
*rtype = subtype;
return 1;
1252}

1254/*
* Parse a unit, possibly calling uaudio_process_unit() for each of
* its sources.
*/
1258int
1259uaudio_process_unit(struct uaudio_softc *sc,
struct uaudio_unit *dest, int id,
struct uaudio_blob units,
struct uaudio_unit **rchild)
1263{
struct uaudio_blob p;
struct uaudio_unit *u, *s;
unsigned int i, j, size, ctl, type, subtype, assoc, clk;
1267#ifdef UAUDIO_DEBUG
unsigned int bit;
1269#endif

if (!uaudio_unit_getdesc(sc, id, units, &p, &subtype))
return 0;

/*
* find this unit on the list as it may be already processed as
* the source of another destination
*/
u = uaudio_unit_byid(sc, id);
if (u == NULL((void *)0)) {
u = malloc(sizeof(struct uaudio_unit), M_USBDEV102, M_WAITOK0x0001);
u->id = id;
u->type = subtype;
u->term = 0;
u->src_list = NULL((void *)0);
u->dst_list = NULL((void *)0);
u->clock = NULL((void *)0);
u->mixent_list = NULL((void *)0);
u->nch = 0;
u->name[0] = 0;
uaudio_ranges_init(&u->rates);
u->unit_next = sc->unit_list;
sc->unit_list = u;
} else {
switch (u->type) {
case UAUDIO_AC_CLKSRC0xa:
case UAUDIO_AC_CLKSEL0xb:
case UAUDIO_AC_CLKMULT0xc:
case UAUDIO_AC_RATECONV0xd:
	/* not using 'dest' list */
	*rchild = u;
	return 1;
}
}

if (dest) {
dest->dst_next = u->dst_list;
u->dst_list = dest;
if (dest->dst_next != NULL((void *)0)) {
	/* already seen */
	*rchild = u;
	return 1;
}
}

switch (u->type) {
case UAUDIO_AC_INPUT0x2:
if (!uaudio_getnum(&p, 2, &u->term))
	return 0;
if (!uaudio_getnum(&p, 1, &assoc))
	return 0;
if (u->term >> 8 != 1)
	sc->nin++;
switch (sc->version) {
case UAUDIO_V10x100:
	break;
case UAUDIO_V20x200:
	if (!uaudio_getnum(&p, 1, &clk))
		return 0;
	if (!uaudio_process_unit(sc, NULL((void *)0),
		clk, units, &u->clock))
		return 0;
	break;
}
if (!uaudio_getnum(&p, 1, &u->nch))
	return 0;
DPRINTF("%02u: "do {} while(0)
    "in, nch = %d, term = 0x%x, assoc = %d\n",do {} while(0)
    u->id, u->nch, u->term, assoc)do {} while(0);
break;
case UAUDIO_AC_OUTPUT0x3:
if (!uaudio_getnum(&p, 2, &u->term))
	return 0;
if (!uaudio_getnum(&p, 1, &assoc))
	return 0;
if (!uaudio_getnum(&p, 1, &id))
	return 0;
if (!uaudio_process_unit(sc, u, id, units, &s))
	return 0;
if (u->term >> 8 != 1)
	sc->nout++;
switch (sc->version) {
case UAUDIO_V10x100:
	break;
case UAUDIO_V20x200:
	if (!uaudio_getnum(&p, 1, &clk))
		return 0;
	if (!uaudio_process_unit(sc, NULL((void *)0),
		clk, units, &u->clock))
		return 0;
	break;
}
u->src_list = s;
s->src_next = NULL((void *)0);
u->nch = s->nch;
DPRINTF("%02u: "do {} while(0)
    "out, id = %d, nch = %d, term = 0x%x, assoc = %d\n",do {} while(0)
    u->id, id, u->nch, u->term, assoc)do {} while(0);
break;
case UAUDIO_AC_MIXER0x4:
if (!uaudio_process_srcs(sc, u, units, &p))
	return 0;
if (!uaudio_process_nch(sc, u, &p))
	return 0;
DPRINTF("%02u: mixer, nch = %u:\n", u->id, u->nch)do {} while(0);

1376#ifdef UAUDIO_DEBUG
/*
 * Print the list of available mixer's unit knobs (a bit
 * matrix). Matrix mixers are rare because levels are
 * already controlled by feature units, making the mixer
 * knobs redundant with the feature's knobs. So, for
 * now, we don't add clutter to the mixer(4) interface
 * and ignore all knobs. Other popular OSes doesn't
 * seem to expose them either.
 */
bit = 0;
for (s = u->src_list; s != NULL((void *)0); s = s->src_next) {
	for (i = 0; i < s->nch; i++) {
		for (j = 0; j < u->nch; j++) {
			if ((bit++ & 7) == 0) {
				if (!uaudio_getnum(&p, 1, &ctl))
					return 0;
			}
			if (ctl & 0x80)
				DPRINTF("\t%02u[%d] -> [%d]\n",do {} while(0)
				    s->id, i, j)do {} while(0);
			ctl <<= 1;
		}
	}
}
1401#endif
break;
case UAUDIO_AC_SELECTOR0x5:
/*
 * Selectors are extremely rare, so not supported yet.
 */
if (!uaudio_process_srcs(sc, u, units, &p))
	return 0;
if (u->src_list == NULL((void *)0)) {
	printf("%s: selector %02u has no sources\n",
	    DEVNAME(sc)((sc)->dev.dv_xname), u->id);
	return 0;
}
u->nch = u->src_list->nch;
DPRINTF("%02u: selector, nch = %u\n", u->id, u->nch)do {} while(0);
break;
case UAUDIO_AC_FEATURE0x6:
if (!uaudio_getnum(&p, 1, &id))
	return 0;
if (!uaudio_process_unit(sc, u, id, units, &s))
	return 0;
s->src_next = u->src_list;
u->src_list = s;
u->nch = s->nch;
switch (sc->version) {
case UAUDIO_V10x100:
	if (!uaudio_getnum(&p, 1, &size))
		return 0;
	break;
case UAUDIO_V20x200:
	size = 4;
	break;
}
DPRINTF("%02d: feature id = %d, nch = %d, size = %d\n",do {} while(0)
    u->id, id, u->nch, size)do {} while(0);

if (!uaudio_getnum(&p, size, &ctl))
	return 0;
ctl = uaudio_feature_fixup(sc, ctl);
for (i = 0; i < 16; i++) {
	if ((ctl & 3) == 3)
		uaudio_feature_addent(sc, u, i, -1);
	ctl >>= 2;
}

/*
 * certain devices provide no per-channel control descriptors
 */
if (p.wptr - p.rptr == 1)
	break;

for (j = 0; j < u->nch; j++) {
	if (!uaudio_getnum(&p, size, &ctl))
		return 0;
	ctl = uaudio_feature_fixup(sc, ctl);
	for (i = 0; i < 16; i++) {
		if ((ctl & 3) == 3)
			uaudio_feature_addent(sc, u, i, j);
		ctl >>= 2;
	}
}
break;
case UAUDIO_AC_EFFECT0x7:
if (!uaudio_getnum(&p, 2, &type))
	return 0;
if (!uaudio_getnum(&p, 1, &id))
	return 0;
if (!uaudio_process_unit(sc, u, id, units, &s))
	return 0;
s->src_next = u->src_list;
u->src_list = s;
u->nch = s->nch;
DPRINTF("%02d: effect, type = %u, id = %d, nch = %d\n",do {} while(0)
    u->id, type, id, u->nch)do {} while(0);
break;
case UAUDIO_AC_PROCESSING0x8:
case UAUDIO_AC_EXTENSION0x9:
if (!uaudio_getnum(&p, 2, &type))
	return 0;
if (!uaudio_process_srcs(sc, u, units, &p))
	return 0;
if (!uaudio_process_nch(sc, u, &p))
	return 0;
DPRINTF("%02u: proc/ext, type = 0x%x, nch = %u\n",do {} while(0)
    u->id, type, u->nch)do {} while(0);
for (s = u->src_list; s != NULL((void *)0); s = s->src_next) {
	DPRINTF("%u:\tpin %u:\n", u->id, s->id)do {} while(0);
}
break;
case UAUDIO_AC_CLKSRC0xa:
if (!uaudio_getnum(&p, 1, &u->term))
	return 0;
if (!uaudio_getnum(&p, 1, &ctl))
	return 0;
DPRINTF("%02u: clock source, attr = 0x%x, ctl = 0x%x\n",do {} while(0)
    u->id, u->term, ctl)do {} while(0);
break;
case UAUDIO_AC_CLKSEL0xb:
DPRINTF("%02u: clock sel\n", u->id)do {} while(0);
if (!uaudio_process_srcs(sc, u, units, &p))
	return 0;
if (u->src_list == NULL((void *)0)) {
	printf("%s: clock selector %02u with no srcs\n",
	    DEVNAME(sc)((sc)->dev.dv_xname), u->id);
	return 0;
}
break;
case UAUDIO_AC_CLKMULT0xc:
DPRINTF("%02u: clock mult\n", u->id)do {} while(0);

/* XXX: fetch multiplier */
printf("%s: clock multiplier not supported\n", DEVNAME(sc)((sc)->dev.dv_xname));
break;
case UAUDIO_AC_RATECONV0xd:
DPRINTF("%02u: rate conv\n", u->id)do {} while(0);

/* XXX: fetch multiplier */
printf("%s: rate converter not supported\n", DEVNAME(sc)((sc)->dev.dv_xname));
break;
}
if (rchild)
*rchild = u;
return 1;
1524}

1526/*
* Try to set the unit name to the name of its destination terminal. If
* the name is ambiguous (already given to another source unit or having
* multiple destinations) then return 0.
*/
1531int
1532uaudio_setname_dsts(struct uaudio_softc *sc, struct uaudio_unit *u, char *name)
1533{
struct uaudio_unit *d = u;

while (d != NULL((void *)0)) {
if (d->dst_list == NULL((void *)0) || d->dst_list->dst_next != NULL((void *)0))
	break;
d = d->dst_list;
if (d->src_list == NULL((void *)0) || d->src_list->src_next != NULL((void *)0))
	break;
if (d->name[0] != '\0') {
	if (name != NULL((void *)0) && strcmp(name, d->name) != 0)
		break;
	strlcpy(u->name, d->name, UAUDIO_NAMEMAX16);
	return 1;
}
}
return 0;
1550}

1552/*
* Try to set the unit name to the name of its source terminal. If the
* name is ambiguous (already given to another destination unit or
* having multiple sources) then return 0.
*/
1557int
1558uaudio_setname_srcs(struct uaudio_softc *sc, struct uaudio_unit *u, char *name)
1559{
struct uaudio_unit *s = u;

while (s != NULL((void *)0)) {
if (s->src_list == NULL((void *)0) || s->src_list->src_next != NULL((void *)0))
	break;
s = s->src_list;
if (s->dst_list == NULL((void *)0) || s->dst_list->dst_next != NULL((void *)0))
	break;
if (s->name[0] != '\0') {
	if (name != NULL((void *)0) && strcmp(name, s->name) != 0)
		break;
	strlcpy(u->name, s->name, UAUDIO_NAMEMAX16);
	return 1;
}
}
return 0;
1576}

1578/*
* Set the name of the given unit by using both its source and
* destination units. This is naming scheme is only useful to units
* that would have ambiguous names if only sources or only destination
* were used.
*/
1584void
1585uaudio_setname_middle(struct uaudio_softc *sc, struct uaudio_unit *u)
1586{
struct uaudio_unit *s, *d;
char name[UAUDIO_NAMEMAX16];

s = u->src_list;
while (1) {
if (s == NULL((void *)0)) {
	DPRINTF("%s: %02u: has no srcs\n",do {} while(0)
	    __func__, u->id)do {} while(0);
	return;
}
if (s->name[0] != '\0')
	break;
s = s->src_list;
}

d = u->dst_list;
while (1) {
if (d == NULL((void *)0)) {
	DPRINTF("%s: %02u: has no dests\n",do {} while(0)
	    __func__, u->id)do {} while(0);
	return;
}
if (d->name[0] != '\0')
	break;
d = d->dst_list;
}

snprintf(name, UAUDIO_NAMEMAX16, "%s_%s", d->name, s->name);
uaudio_mkname(sc, name, u->name);
1616}

1618#ifdef UAUDIO_DEBUG
1619/*
* Return the synchronization type name, for debug purposes only.
*/
1622char *
1623uaudio_isoname(int isotype)
1624{
switch (isotype) {
case UE_ISO_ASYNC0x04:
return "async";
case UE_ISO_ADAPT0x08:
return "adapt";
case UE_ISO_SYNC0x0c:
return "sync";
default:
return "unk";
}
1635}

1637/*
* Return the name of the given mode, debug only
*/
1640char *
1641uaudio_modename(int mode)
1642{
switch (mode) {
case 0:
return "none";
case AUMODE_PLAY0x01:
return "play";
case AUMODE_RECORD0x02:
return "rec";
case AUMODE_PLAY0x01 | AUMODE_RECORD0x02:
return "duplex";
default:
return "unk";
}
1655}

1657/*
* Return UAC v2.0 endpoint usage, debug only
*/
1660char *
1661uaudio_usagename(int usage)
1662{
switch (usage) {
case UE_ISO_USAGE_DATA0x00:
return "data";
case UE_ISO_USAGE_FEEDBACK0x10:
return "feed";
case UE_ISO_USAGE_IMPL0x20:
return "impl";
default:
return "unk";
}
1673}

1675/*
* Print a bitmap of rates on the console.
*/
1678void
1679uaudio_rates_print(int rates)
1680{
unsigned int i;

for (i = 0; i < nitems(uaudio_rates)(sizeof((uaudio_rates)) / sizeof((uaudio_rates)[0])); i++) {
if (rates & (1 << i))
	printf(" %d", uaudio_rates[i]);
}
printf("\n");
1688}


1691/*
* Print uaudio_ranges to console.
*/
1694void
1695uaudio_ranges_print(struct uaudio_ranges *r)
1696{
struct uaudio_ranges_el *e;
int more = 0;

for (e = r->el; e != NULL((void *)0); e = e->next) {
if (more)
	printf(", ");
if (e->min == e->max)
	printf("%d", e->min);
else
	printf("[%d:%d]/%d", e->min, e->max, e->res);
more = 1;
}
printf(" (%d vals)\n", r->nval);
1710}

1712/*
* Print unit to the console.
*/
1715void
1716uaudio_print_unit(struct uaudio_softc *sc, struct uaudio_unit *u)
1717{
struct uaudio_unit *s;

switch (u->type) {
case UAUDIO_AC_INPUT0x2:
printf("%02u: input <%s>, dest = %02u <%s>\n",
    u->id, u->name, u->dst_list->id, u->dst_list->name);
break;
case UAUDIO_AC_OUTPUT0x3:
printf("%02u: output <%s>, source = %02u <%s>\n",
    u->id, u->name, u->src_list->id, u->src_list->name);
break;
case UAUDIO_AC_MIXER0x4:
printf("%02u: mixer <%s>:\n", u->id, u->name);
for (s = u->src_list; s != NULL((void *)0); s = s->src_next)
	printf("%02u:\tsource %u <%s>:\n",
	    u->id, s->id, s->name);
break;
case UAUDIO_AC_SELECTOR0x5:
printf("%02u: selector <%s>:\n", u->id, u->name);
for (s = u->src_list; s != NULL((void *)0); s = s->src_next)
	printf("%02u:\tsource %u <%s>:\n",
	    u->id, s->id, s->name);
break;
case UAUDIO_AC_FEATURE0x6:
printf("%02u: feature <%s>, "
    "src = %02u <%s>, dst = %02u <%s>, cls = %d\n",
    u->id, u->name,
    u->src_list->id, u->src_list->name,
    u->dst_list->id, u->dst_list->name, u->mixer_class);
break;
case UAUDIO_AC_EFFECT0x7:
printf("%02u: effect <%s>, "
    "src = %02u <%s>, dst = %02u <%s>\n",
    u->id, u->name,
    u->src_list->id, u->src_list->name,
    u->dst_list->id, u->dst_list->name);
break;
case UAUDIO_AC_PROCESSING0x8:
case UAUDIO_AC_EXTENSION0x9:
printf("%02u: proc/ext <%s>:\n", u->id, u->name);
for (s = u->src_list; s != NULL((void *)0); s = s->src_next)
	printf("%02u:\tsource %u <%s>:\n",
	    u->id, s->id, s->name);
break;
case UAUDIO_AC_CLKSRC0xa:
printf("%02u: clock source <%s>\n", u->id, u->name);
break;
case UAUDIO_AC_CLKSEL0xb:
printf("%02u: clock sel <%s>\n", u->id, u->name);
break;
case UAUDIO_AC_CLKMULT0xc:
printf("%02u: clock mult\n", u->id);
break;
case UAUDIO_AC_RATECONV0xd:
printf("%02u: rate conv\n", u->id);
break;
}
1775}

1777/*
* Print the full mixer on the console.
*/
1780void
1781uaudio_mixer_print(struct uaudio_softc *sc)
1782{
struct uaudio_mixent *m;
struct uaudio_unit *u;

for (u = sc->unit_list; u != NULL((void *)0); u = u->unit_next) {
for (m = u->mixent_list; m != NULL((void *)0); m = m->next) {
	printf("%02u:\t%s.%s",
	    u->id, u->name, m->fname);
	if (m->chan >= 0)
		printf("[%u]", m->chan);
	printf("\n");
}
}
1795}

1797/*
* Print the full device configuration on the console.
*/
1800void
1801uaudio_conf_print(struct uaudio_softc *sc)
1802{
struct uaudio_alt *a;
struct uaudio_params *p;
struct mixer_devinfo mi;
struct mixer_ctrl ctl;
int i, rates;

mi.index = 0;
while (1) {
if (uaudio_query_devinfo(sc, &mi) != 0)
	break;

if (mi.type != AUDIO_MIXER_CLASS0) {
	ctl.dev = mi.index;
	if (uaudio_get_port(sc, &ctl) != 0) {
		printf("%02u: failed to get port\n", mi.index);
		memset(&ctl.un, 0, sizeof(ctl.un))__builtin_memset((&ctl.un), (0), (sizeof(ctl.un)));
	}
}

printf("%02u: <%s>, next = %d, prev = %d, class = %d",
    mi.index, mi.label.name, mi.next, mi.prev, mi.mixer_class);

switch (mi.type) {
case AUDIO_MIXER_CLASS0:
	break;
case AUDIO_MIXER_VALUE3:
	printf(", nch = %d, delta = %d",
	    mi.un.v.num_channels, mi.un.v.delta);
	printf(", val =");
	for (i = 0; i < mi.un.v.num_channels; i++)
		printf(" %d", ctl.un.value.level[i]);
	break;
case AUDIO_MIXER_ENUM1:
	printf(", members:");
	for (i = 0; i != mi.un.e.num_mem; i++) {
		printf(" %s(=%d)",
		    mi.un.e.member[i].label.name,
		    mi.un.e.member[i].ord);
	}
	printf(", val = %d", ctl.un.ord);
	break;
}

printf("\n");
mi.index++;
}

printf("%d controls\n", mi.index);

printf("alts:\n");
for (a = sc->alts; a != NULL((void *)0); a = a->next) {
rates = uaudio_alt_getrates(sc, a);
printf("mode = %s, ifnum = %d, altnum = %d, "
    "addr = 0x%x, maxpkt = %d, sync = 0x%x, "
    "nch = %d, fmt = s%dle%d, rates:",
    uaudio_modename(a->mode),
    a->ifnum, a->altnum,
    a->data_addr, a->maxpkt,
    a->sync_addr,
    a->nch, a->bits, a->bps);
uaudio_rates_print(rates);
}

printf("parameters:\n");
for (p = sc->params_list; p != NULL((void *)0); p = p->next) {
switch (sc->version) {
case UAUDIO_V10x100:
	rates = p->v1_rates;
	break;
case UAUDIO_V20x200:
	rates = uaudio_getrates(sc, p);
	break;
}
printf("pchan = %d, s%dle%d, rchan = %d, s%dle%d, rates:",
    p->palt ? p->palt->nch : 0,
    p->palt ? p->palt->bits : 0,
    p->palt ? p->palt->bps : 0,
    p->ralt ? p->ralt->nch : 0,
    p->ralt ? p->ralt->bits : 0,
    p->ralt ? p->ralt->bps : 0);
uaudio_rates_print(rates);
}
1885}
1886#endif

1888/*
* Return the number of mixer controls that have the same name but
* control different channels of the same stream.
*/
1892int
1893uaudio_mixer_nchan(struct uaudio_mixent *m, struct uaudio_mixent **rnext)
1894{
char *name;
int i;

i = 0;
name = m->fname;
while (m != NULL((void *)0) && strcmp(name, m->fname) == 0) {
m = m->next;
i++;
}
if (rnext)
*rnext = m;
return i;
1907}

1909/*
* Skip redundant mixer entries that we don't want to expose to userland.
* For instance if there is a mute-all-channels control and per-channel
* mute controls, we don't want both (we expose the per-channel mute)
*/
1914void
1915uaudio_mixer_skip(struct uaudio_mixent **pm)
1916{
struct uaudio_mixent *m = *pm;

if (m != NULL((void *)0) &&
   m->chan == -1 &&
   m->next != NULL((void *)0) &&
   strcmp(m->fname, m->next->fname) == 0)
m = m->next;

*pm = m;
1926}

1928/*
* Return pointer to the unit and mixer entry which have the given
* index exposed by the mixer(4) API.
*/
1932int
1933uaudio_mixer_byindex(struct uaudio_softc *sc, int index,
  struct uaudio_unit **ru, struct uaudio_mixent **rm)
1935{
struct uaudio_unit *u;
struct uaudio_mixent *m;
char *name;
int i;

i = UAUDIO_CLASS_COUNT2;
for (u = sc->unit_list; u != NULL((void *)0); u = u->unit_next) {
m = u->mixent_list;
while (1) {
	uaudio_mixer_skip(&m);
	if (m == NULL((void *)0))
		break;
	if (index == i) {
		*ru = u;
		*rm = m;
		return 1;
	}
	if (m->type == UAUDIO_MIX_NUM1) {
		name = m->fname;
		while (m != NULL((void *)0) &&
		    strcmp(name, m->fname) == 0)
			m = m->next;
	} else
		m = m->next;
	i++;
}
}
return 0;
1964}

1966/*
* Parse AC header descriptor, we use it only to determine UAC
* version. Other properties (like wTotalLength) can be determined
* using other descriptors, so we try to no rely on them to avoid
* inconsistencies and the need for certain quirks.
*/
1972int
1973uaudio_process_header(struct uaudio_softc *sc, struct uaudio_blob *p)
1974{
struct uaudio_blob ph;
unsigned int type, subtype;

if (!uaudio_getdesc(p, &ph))
return 0;
if (!uaudio_getnum(&ph, 1, &type))
return 0;
if (type != UDESC_CS_INTERFACE0x24) {
DPRINTF("%s: expected cs iface desc\n", __func__)do {} while(0);
return 0;
}
if (!uaudio_getnum(&ph, 1, &subtype))
return 0;
if (subtype != UAUDIO_AC_HEADER0x1) {
DPRINTF("%s: expected header desc\n", __func__)do {} while(0);
return 0;
}
if (!uaudio_getnum(&ph, 2, &sc->version))
return 0;

DPRINTF("%s: version 0x%x\n", __func__, sc->version)do {} while(0);
return 1;
1997}

1999/*
* Process AC interrupt endpoint descriptor, this is mainly to skip
* the descriptor as we use neither of its properties. Our mixer
* interface doesn't support unsolicitated state changes, so we've no
* use of it yet.
*/
2005int
2006uaudio_process_ac_ep(struct uaudio_softc *sc, struct uaudio_blob *p)
2007{
2008#ifdef UAUDIO_DEBUG
static const char *xfer[] = {
"ctl", "iso", "bulk", "intr"
};
2012#endif
struct uaudio_blob dp;
unsigned int type, addr, attr, maxpkt, ival;
unsigned char *savepos;

/*
* parse optional interrupt endpoint descriptor
*/
if (p->rptr == p->wptr)
return 1;
savepos = p->rptr;
if (!uaudio_getdesc(p, &dp))
return 0;
if (!uaudio_getnum(&dp, 1, &type))
return 0;
if (type != UDESC_ENDPOINT0x05) {
p->rptr = savepos;
return 1;
}

if (!uaudio_getnum(&dp, 1, &addr))
return 0;
if (!uaudio_getnum(&dp, 1, &attr))
return 0;
if (!uaudio_getnum(&dp, 2, &maxpkt))
return 0;
if (!uaudio_getnum(&dp, 1, &ival))
return 0;

DPRINTF("%s: addr = 0x%x, type = %s, maxpkt = %d, ival = %d\n",do {} while(0)
   __func__, addr, xfer[UE_GET_XFERTYPE(attr)],do {} while(0)
   UE_GET_SIZE(maxpkt), ival)do {} while(0);

return 1;
2046}

2048/*
* Process the AC interface descriptors: mainly build the mixer and,
* for UAC v2.0, find the clock source.
*
* The audio device exposes an audio control (AC) interface with a big
* set of USB descriptors which expose the complete circuit the
* device. The circuit describes how the signal flows between the USB
* streaming interfaces to the terminal connectors (jacks, speakers,
* mics, ...). The circuit is build of mixers, source selectors, gain
* controls, mutters, processors, and alike; each comes with its own
* set of controls. Most of the boring driver work is to parse the
* circuit and build a human-usable set of controls that could be
* exposed through the mixer(4) interface.
*/
2062int
2063uaudio_process_ac(struct uaudio_softc *sc, struct uaudio_blob *p, int ifnum)
2064{
struct uaudio_blob units, pu;
struct uaudio_unit *u, *v;
unsigned char *savepos;
unsigned int type, subtype, id;
char *name, val;

DPRINTF("%s: ifnum = %d, %zd bytes to process\n", __func__,do {} while(0)
   ifnum, p->wptr - p->rptr)do {} while(0);

sc->ctl_ifnum = ifnum;

/* The first AC class-specific descriptor is the AC header */
if (!uaudio_process_header(sc, p))
return 0;

/*
* Determine the size of the AC descriptors array: scan
* descriptors until we get the first non-class-specific
* descriptor. This avoids relying on the wTotalLength field.
*/
savepos = p->rptr;
units.rptr = units.wptr = p->rptr;
while (p->rptr != p->wptr) {
if (!uaudio_getdesc(p, &pu))
	return 0;
if (!uaudio_getnum(&pu, 1, &type))
	return 0;
if (type != UDESC_CS_INTERFACE0x24)
	break;
units.wptr = p->rptr;
}
p->rptr = savepos;

/*
* Load units, walking from outputs to inputs, as
* the usb audio class spec requires.
*/
while (p->rptr != units.wptr) {
if (!uaudio_getdesc(p, &pu))
	return 0;
if (!uaudio_getnum(&pu, 1, &type))
	return 0;
if (!uaudio_getnum(&pu, 1, &subtype))
	return 0;
if (subtype == UAUDIO_AC_OUTPUT0x3) {
	if (!uaudio_getnum(&pu, 1, &id))
		return 0;
	if (!uaudio_process_unit(sc, NULL((void *)0), id, units, NULL((void *)0)))
		return 0;
}
}

/*
* set terminal, effect, and processor unit names
*/
for (u = sc->unit_list; u != NULL((void *)0); u = u->unit_next) {
switch (u->type) {
case UAUDIO_AC_INPUT0x2:
	uaudio_mkname(sc, uaudio_tname(sc, u->term, 0), u->name);
	break;
case UAUDIO_AC_OUTPUT0x3:
	uaudio_mkname(sc, uaudio_tname(sc, u->term, 1), u->name);
	break;
case UAUDIO_AC_CLKSRC0xa:
	uaudio_mkname(sc, uaudio_clkname(u->term), u->name);
	break;
case UAUDIO_AC_CLKSEL0xb:
	uaudio_mkname(sc, "clksel", u->name);
	break;
case UAUDIO_AC_EFFECT0x7:
	uaudio_mkname(sc, "fx", u->name);
	break;
case UAUDIO_AC_PROCESSING0x8:
	uaudio_mkname(sc, "proc", u->name);
	break;
case UAUDIO_AC_EXTENSION0x9:
	uaudio_mkname(sc, "ext", u->name);
	break;
}
}

/*
* set mixer/selector unit names
*/
for (u = sc->unit_list; u != NULL((void *)0); u = u->unit_next) {
if (u->type != UAUDIO_AC_MIXER0x4 &&
    u->type != UAUDIO_AC_SELECTOR0x5)
	continue;
if (!uaudio_setname_dsts(sc, u, NULL((void *)0))) {
	switch (u->type) {
	case UAUDIO_AC_MIXER0x4:
		name = "mix";
		break;
	case UAUDIO_AC_SELECTOR0x5:
		name = "sel";
		break;
	}
	uaudio_mkname(sc, name, u->name);
}
}

/*
* set feature unit names and classes
*/
for (u = sc->unit_list; u != NULL((void *)0); u = u->unit_next) {
if (u->type != UAUDIO_AC_FEATURE0x6)
	continue;
if (uaudio_setname_dsts(sc, u, UAUDIO_NAME_REC"record")) {
	u->mixer_class = UAUDIO_CLASS_IN1;
	continue;
}
if (uaudio_setname_srcs(sc, u, UAUDIO_NAME_PLAY"dac")) {
	u->mixer_class = UAUDIO_CLASS_OUT0;
	continue;
}
if (uaudio_setname_dsts(sc, u, NULL((void *)0))) {
	u->mixer_class = UAUDIO_CLASS_OUT0;
	continue;
}
if (uaudio_setname_srcs(sc, u, NULL((void *)0))) {
	u->mixer_class = UAUDIO_CLASS_IN1;
	continue;
}
uaudio_setname_middle(sc, u);
u->mixer_class = UAUDIO_CLASS_IN1;
}

2192#ifdef UAUDIO_DEBUG
if (uaudio_debug) {
printf("%s: units list:\n", DEVNAME(sc)((sc)->dev.dv_xname));
for (u = sc->unit_list; u != NULL((void *)0); u = u->unit_next)
	uaudio_print_unit(sc, u);

printf("%s: mixer controls:\n", DEVNAME(sc)((sc)->dev.dv_xname));
uaudio_mixer_print(sc);
}
2201#endif

/* follows optional interrupt endpoint descriptor */
if (!uaudio_process_ac_ep(sc, p))
return 0;

/* fetch clock source rates */
for (u = sc->unit_list; u != NULL((void *)0); u = u->unit_next) {
switch (u->type) {
case UAUDIO_AC_CLKSRC0xa:
	if (!uaudio_req_ranges(sc, 4,
		UAUDIO_V2_REQSEL_CLKFREQ1,
		0, /* channel (not used) */
		sc->ctl_ifnum,
		u->id,
		&u->rates)) {
		printf("%s: failed to read clock rates\n",
		    DEVNAME(sc)((sc)->dev.dv_xname));
		return 0;
	}
2221#ifdef UAUDIO_DEBUG
	if (uaudio_debug) {
		printf("%02u: clock rates: ", u->id);
		uaudio_ranges_print(&u->rates);
	}
2226#endif
	break;
case UAUDIO_AC_CLKSEL0xb:
	if (!uaudio_req(sc, UT_READ_CLASS_INTERFACE(0x80 | 0x20 | 0x01),
		UAUDIO_V2_REQ_CUR1,
		UAUDIO_V2_REQSEL_CLKSEL1, 0,
		sc->ctl_ifnum, u->id,
		&val, 1)) {
		printf("%s: failed to read clock selector\n",
		    DEVNAME(sc)((sc)->dev.dv_xname));
		return 0;
	}
	for (v = u->src_list; v != NULL((void *)0); v = v->src_next) {
		if (--val == 0)
			break;
	}
	u->clock = v;
	break;
}
}

if (sc->version == UAUDIO_V20x200) {
/*
 * Find common clock unit. We assume all terminals
 * belong to the same clock domain (ie are connected
 * to the same source)
 */
sc->clock = NULL((void *)0);
for (u = sc->unit_list; u != NULL((void *)0); u = u->unit_next) {
	if (u->type != UAUDIO_AC_INPUT0x2 &&
	    u->type != UAUDIO_AC_OUTPUT0x3)
		continue;
	if (sc->clock == NULL((void *)0)) {
		if (u->clock == NULL((void *)0)) {
			printf("%s: terminal with no clock\n",
			    DEVNAME(sc)((sc)->dev.dv_xname));
			return 0;
		}
		sc->clock = u->clock;
	} else if (u->clock != sc->clock) {
		printf("%s: only one clock domain supported\n",
		    DEVNAME(sc)((sc)->dev.dv_xname));
		return 0;
	}
}

if (sc->clock == NULL((void *)0)) {
	printf("%s: no clock found\n", DEVNAME(sc)((sc)->dev.dv_xname));
	return 0;
}
}
return 1;
2278}

2280/*
* Parse endpoint descriptor with the following format:
*
* For playback there's a output data endpoint, of the
* following types:
*
*  type	sync	descr
*  -------------------------------------------------------
*  async:	Yes	the device uses its own clock but
*			sends feedback on a (input) sync endpoint
*			for the host to adjust next packet size
*
*  sync:	-	data rate is constant, and device
*			is clocked to the usb bus.
*
*  adapt:	-	the device adapts to data rate of the
*			host. If fixed packet size is used,
*			data rate is equivalent to the usb clock
*			so this mode is the same as the
*			sync mode.
*
* For recording there's and input data endpoint, of
* the following types:
*
*  type	sync	descr
*  -------------------------------------------------------
*  async:	-	the device uses its own clock and
*			adjusts packet sizes.
*
*  sync:	-	the device uses usb clock rate
*
*  adapt:	Yes	the device uses host's feedback (on
*			on a dedicated (output) sync endpoint
*			to adapt to software's desired rate
*
*
* For usb1.1 ival is cardcoded to 1 for isochronous
* transfers, which means one transfer every ms. I.e one
* transfer every frame period.
*
* For usb2, ival the poll interval is:
*
*	frame_period * 2^(ival - 1)
*
* so, if we use this formula, we get something working in all
* cases.
*
* The MaxPacketsOnly attribute is used only by "Type II" encodings,
* so we don't care about it.
*/
2330int
2331uaudio_process_as_ep(struct uaudio_softc *sc,
struct uaudio_blob *p, struct uaudio_alt *a, int nep)
2333{
unsigned int addr, attr, maxpkt, isotype, ival;

if (!uaudio_getnum(p, 1, &addr))
return 0;
if (!uaudio_getnum(p, 1, &attr))
return 0;
if (!uaudio_getnum(p, 2, &maxpkt))
return 0;
if (!uaudio_getnum(p, 1, &ival)) /* bInterval */
return 0;

DPRINTF("%s: addr = 0x%x, %s/%s, "do {} while(0)
   "maxpktsz = %d, ival = %d\n",do {} while(0)
   __func__, addr,do {} while(0)
   uaudio_isoname(UE_GET_ISO_TYPE(attr)),do {} while(0)
   uaudio_usagename(UE_GET_ISO_USAGE(attr)),do {} while(0)
   maxpkt, ival)do {} while(0);

if (UE_GET_XFERTYPE(attr)((attr) & 0x03) != UE_ISOCHRONOUS0x01) {
printf("%s: skipped non-isoc endpt.\n", DEVNAME(sc)((sc)->dev.dv_xname));
return 1;
}

/*
* For each AS interface setting, there's a single data
* endpoint and an optional feedback endpoint. The
* synchronization type is non-zero and must be set in the data
* endpoints.
*
* However, the isoc sync type field of the attribute can't be
* trusted: a lot of devices have it wrong. If the isoc sync
* type is set it's necessarily a data endpoint, if it's not,
* then if it is the only endpoint, it necessarily the data
* endpoint.
*/
isotype = UE_GET_ISO_TYPE(attr)((attr) & 0x0c);
if (isotype || nep == 1) {
/* this is the data endpoint */

if (a->data_addr && addr != a->data_addr) {
	printf("%s: skipped extra data endpt.\n", DEVNAME(sc)((sc)->dev.dv_xname));
	return 1;
}

a->mode = (UE_GET_DIR(addr)((addr) & 0x80) == UE_DIR_IN0x80) ?
    AUMODE_RECORD0x02 : AUMODE_PLAY0x01;
a->data_addr = addr;
a->fps = sc->ufps / (1 << (ival - 1));
a->maxpkt = UE_GET_SIZE(maxpkt)((maxpkt) & 0x7ff);
} else {
/* this is the sync endpoint */

if (a->sync_addr && addr != a->sync_addr) {
	printf("%s: skipped extra sync endpt.\n", DEVNAME(sc)((sc)->dev.dv_xname));
	return 1;
}
a->sync_addr = addr;
}

return 1;
2394}

2396/*
* Parse AS general descriptor. Non-PCM interfaces are skipped. UAC
* v2.0 report the number of channels. For UAC v1.0 we set the number
* of channels to zero, it will be determined later from the format
* descriptor.
*/
2402int
2403uaudio_process_as_general(struct uaudio_softc *sc,
struct uaudio_blob *p, int *rispcm, struct uaudio_alt *a)
2405{
unsigned int term, fmt, ctl, fmt_type, fmt_map, nch;

if (!uaudio_getnum(p, 1, &term))
return 0;
switch (sc->version) {
case UAUDIO_V10x100:
if (!uaudio_getnum(p, 1, NULL((void *)0)))	/* bDelay */
	return 0;
if (!uaudio_getnum(p, 1, &fmt))
	return 0;
*rispcm = (fmt == UAUDIO_V1_FMT_PCM0x1);
break;
case UAUDIO_V20x200:
/* XXX: should we check if alt setting control is valid ? */
if (!uaudio_getnum(p, 1, &ctl))
	return 0;
if (!uaudio_getnum(p, 1, &fmt_type))
	return 0;
if (!uaudio_getnum(p, 4, &fmt_map))
	return 0;
if (!uaudio_getnum(p, 1, &nch))
	return 0;
a->nch = nch;
*rispcm = (fmt_type == 1) && (fmt_map & UAUDIO_V2_FMT_PCM0x01);
}
return 1;
2432}

2434/*
* Parse AS format descriptor: we support only "Type 1" formats, aka
* PCM. Other formats are not really audio, they are data-only
* interfaces that we don't want to support: ethernet is much better
* for raw data transfers.
*
* XXX: handle ieee 754 32-bit floating point formats.
*/
2442int
2443uaudio_process_as_format(struct uaudio_softc *sc,
struct uaudio_blob *p, struct uaudio_alt *a, int *ispcm)
2445{
unsigned int type, bps, bits, nch, nrates, rate_min, rate_max, rates;
int i, j;

switch (sc->version) {
case UAUDIO_V10x100:
if (!uaudio_getnum(p, 1, &type))
	return 0;
if (type != 1) {
	DPRINTF("%s: class v1: "do {} while(0)
	    "skipped unsupported type = %d\n", __func__, type)do {} while(0);
	*ispcm = 0;
	return 1;
}
if (!uaudio_getnum(p, 1, &nch))
	return 0;
if (!uaudio_getnum(p, 1, &bps))
	return 0;
if (!uaudio_getnum(p, 1, &bits))
	return 0;
if (!uaudio_getnum(p, 1, &nrates))
	return 0;
rates = 0;
if (nrates == 0) {
	if (!uaudio_getnum(p, 3, &rate_min))
		return 0;
	if (!uaudio_getnum(p, 3, &rate_max))
		return 0;
	for (i = 0; i < nitems(uaudio_rates)(sizeof((uaudio_rates)) / sizeof((uaudio_rates)[0])); i++) {
		if (uaudio_rates[i] >= rate_min &&
		    uaudio_rates[i] <= rate_max)
			rates |= 1 << i;
	}
} else {
	for (j = 0; j < nrates; j++) {
		if (!uaudio_getnum(p, 3, &rate_min))
			return 0;
		for (i = 0; i < nitems(uaudio_rates)(sizeof((uaudio_rates)) / sizeof((uaudio_rates)[0])); i++) {
			if (uaudio_rates[i] == rate_min)
				rates |= 1 << i;
		}
	}
}
a->v1_rates = rates;
a->nch = nch;
break;
case UAUDIO_V20x200:
/*
 * sample rate ranges are obtained with requests to
 * the clock source, as defined by the clock source
 * descriptor
 *
 * the number of channels is in the GENERAL descriptor
 */
if (!uaudio_getnum(p, 1, &type))
	return 0;
if (type != 1) {
	DPRINTF("%s: class v2: "do {} while(0)
	    "skipped unsupported type = %d\n", __func__, type)do {} while(0);
	*ispcm = 0;
	return 1;
}
if (!uaudio_getnum(p, 1, &bps))
	return 0;
if (!uaudio_getnum(p, 1, &bits))
	return 0;

/*
 * nch is in the v2 general desc, rates come from the
 * clock source, so we're done.
 */
break;
}
a->bps = bps;
a->bits = bits;
*ispcm = 1;
return 1;
2522}

2524/*
* Parse AS descriptors.
*
* The audio streaming (AS) interfaces are used to move data between
* the host and the device. On the one hand, the device has
* analog-to-digital (ADC) and digital-to-analog (DAC) converters
* which have their own low-jitter clock source. On other hand, the
* USB host runs a bus clock using another clock source. So both
* drift. That's why, the device sends feedback to the driver for the
* host to adjust continuously its data rate, hence the need for sync
* endpoints.
*/
2536int
2537uaudio_process_as(struct uaudio_softc *sc,
  struct uaudio_blob *p, int ifnum, int altnum, int nep)
2539{
struct uaudio_alt *a, *anext, **pa;
struct uaudio_blob dp;
unsigned char *savep;
unsigned int type, subtype;
int ispcm = 0;

a = malloc(sizeof(struct uaudio_alt), M_USBDEV102, M_WAITOK0x0001);
a->mode = 0;
a->nch = 0;
a->v1_rates = 0;
a->data_addr = 0;
a->sync_addr = 0;
a->ifnum = ifnum;
a->altnum = altnum;

while (p->rptr != p->wptr) {
savep = p->rptr;
if (!uaudio_getdesc(p, &dp))
	goto failed;
if (!uaudio_getnum(&dp, 1, &type))
	goto failed;
if (type != UDESC_CS_INTERFACE0x24) {
	p->rptr = savep;
	break;
}
if (!uaudio_getnum(&dp, 1, &subtype))
	goto failed;
switch (subtype) {
case UAUDIO_AS_GENERAL0x1:
	if (!uaudio_process_as_general(sc, &dp, &ispcm, a))
		goto failed;
	break;
case UAUDIO_AS_FORMAT0x2:
	if (!uaudio_process_as_format(sc, &dp, a, &ispcm))
		goto failed;
	break;
default:
	DPRINTF("%s: unknown desc\n", __func__)do {} while(0);
	continue;
}
if (!ispcm) {
	DPRINTF("%s: non-pcm iface\n", __func__)do {} while(0);
	free(a, M_USBDEV102, sizeof(struct uaudio_alt));
	return 1;
}
}

while (p->rptr != p->wptr) {
savep = p->rptr;
if (!uaudio_getdesc(p, &dp))
	goto failed;
if (!uaudio_getnum(&dp, 1, &type))
	goto failed;
if (type == UDESC_CS_ENDPOINT0x25)
	continue;
if (type != UDESC_ENDPOINT0x05) {
	p->rptr = savep;
	break;
}
if (!uaudio_process_as_ep(sc, &dp, a, nep))
	goto failed;
}

if (a->mode == 0) {
printf("%s: no data endpoints found\n", DEVNAME(sc)((sc)->dev.dv_xname));
free(a, M_USBDEV102, sizeof(struct uaudio_alt));
return 1;
}

/*
* Append to list of alts, but keep the list sorted by number
* of channels, bits and rate. From the most capable to the
* less capable.
*/
pa = &sc->alts;
while (1) {
if ((anext = *pa) == NULL((void *)0))
	break;
if (a->nch > anext->nch)
	break;
else if (a->nch == anext->nch) {
	if (a->bits > anext->bits)
		break;
	else if (sc->version == UAUDIO_V10x100 &&
		a->v1_rates > anext->v1_rates)
		break;
}
pa = &anext->next;
}
a->next = *pa;
*pa = a;
return 1;
2632failed:
free(a, M_USBDEV102, sizeof(struct uaudio_alt));
return 0;
2635}

2637/*
* Populate the sc->params_list with combinations of play and rec alt
* settings that work together in full-duplex.
*/
2641void
2642uaudio_fixup_params(struct uaudio_softc *sc)
2643{
struct uaudio_alt *ap, *ar, *a;
struct uaudio_params *p, **pp;
int rates;
27
←
'rates' declared without an initial value→

/*
* Add full-duplex parameter combinations.
*/
pp = &sc->params_list;
for (ap = sc->alts; ap != NULL((void *)0); ap = ap->next) {
28
←
Assuming 'ap' is not equal to NULL→
29
←
Loop condition is true.  Entering loop body→
if (ap->mode != AUMODE_PLAY0x01)
30
←
Assuming field 'mode' is equal to AUMODE_PLAY→
31
←
Taking false branch→
	continue;
for (ar = sc->alts; ar31.1
'ar' is not equal to NULL
 != NULL((void *)0); ar = ar->next) {
32
←
Loop condition is true.  Entering loop body→
35
←
Assuming 'ar' is not equal to NULL→
36
←
Loop condition is true.  Entering loop body→
	if (ar->mode32.1
Field 'mode' is not equal to AUMODE_RECORD
 != AUMODE_RECORD0x02)
33
←
Taking true branch→
37
←
Assuming field 'mode' is equal to AUMODE_RECORD→
		continue;
34
←
 Execution continues on line 2655→
	if (ar->bps != ap->bps || ar->bits != ap->bits)
38
←
Assuming 'ar->bps' is equal to 'ap->bps'→
39
←
Assuming 'ar->bits' is equal to 'ap->bits'→
40
←
Taking false branch→
		continue;
	switch (sc->version) {
	case UAUDIO_V10x100:
		rates = ap->v1_rates & ar->v1_rates;
		if (rates == 0)
			continue;
		break;
	case UAUDIO_V20x200:
		/* UAC v2.0 common rates */
		rates = 0;
		break;
	}
	p = malloc(sizeof(struct uaudio_params),
41
←
'Default' branch taken. Execution continues on line 2671→
	    M_USBDEV102, M_WAITOK0x0001);
	p->palt = ap;
	p->ralt = ar;
	p->v1_rates = rates;
42
←
Assigned value is garbage or undefined
	p->next = NULL((void *)0);
	*pp = p;
	pp = &p->next;
}
}

/*
* For unidirectional devices, add play-only and or rec-only
* parameters.
*/
if (sc->params_list == NULL((void *)0)) {
for (a = sc->alts; a != NULL((void *)0); a = a->next) {
	p = malloc(sizeof(struct uaudio_params),
	    M_USBDEV102, M_WAITOK0x0001);
	if (a->mode == AUMODE_PLAY0x01) {
		p->palt = a;
		p->ralt = NULL((void *)0);
	} else {
		p->palt = NULL((void *)0);
		p->ralt = a;
	}
	p->v1_rates = a->v1_rates;
	p->next = NULL((void *)0);
	*pp = p;
	pp = &p->next;
}
}
2703}

2705/*
* Parse all descriptors and build configuration of the device.
*/
2708int
2709uaudio_process_conf(struct uaudio_softc *sc, struct uaudio_blob *p)
2710{
struct uaudio_blob dp;
struct uaudio_alt *a;
unsigned int type, ifnum, altnum, nep, class, subclass;

while (p->rptr24.1
Field 'rptr' is equal to field 'wptr'
 != p->wptr) {
6
←
Assuming field 'rptr' is not equal to field 'wptr'→
7
←
Loop condition is true.  Entering loop body→
25
←
Loop condition is false. Execution continues on line 2765→
if (!uaudio_getdesc(p, &dp))
8
←
Taking false branch→
	return 0;
if (!uaudio_getnum(&dp, 1, &type))
9
←
Taking false branch→
	return 0;
if (type != UDESC_INTERFACE0x04)
10
←
Assuming 'type' is equal to UDESC_INTERFACE→
11
←
Taking false branch→
	continue;
if (!uaudio_getnum(&dp, 1, &ifnum))
12
←
Taking false branch→
	return 0;
if (!uaudio_getnum(&dp, 1, &altnum))
13
←
Taking false branch→
	return 0;
if (!uaudio_getnum(&dp, 1, &nep))
14
←
Taking false branch→
	return 0;
if (!uaudio_getnum(&dp, 1, &class))
15
←
Taking false branch→
	return 0;
if (!uaudio_getnum(&dp, 1, &subclass))
16
←
Taking false branch→
	return 0;
if (class != UICLASS_AUDIO0x01) {
17
←
Assuming 'class' is equal to UICLASS_AUDIO→
18
←
Taking false branch→
	DPRINTF("%s: skipped iface\n", __func__)do {} while(0);
	continue;
}

switch (subclass) {
19
←
Control jumps to 'case 2:'  at line 2750→
case UISUBCLASS_AUDIOCONTROL1:
	if (usbd_iface_claimed(sc->udev, ifnum)) {
		DPRINTF("%s: %d: AC already claimed\n", __func__, ifnum)do {} while(0);
		break;
	}
	if (sc->unit_list != NULL((void *)0)) {
		DPRINTF("%s: >1 AC ifaces\n", __func__)do {} while(0);
		goto done;
	}
	if (!uaudio_process_ac(sc, p, ifnum))
		return 0;
	break;
case UISUBCLASS_AUDIOSTREAM2:
	if (usbd_iface_claimed(sc->udev, ifnum)) {
20
←
Assuming the condition is false→
21
←
Taking false branch→
		DPRINTF("%s: %d: AS already claimed\n", __func__, ifnum)do {} while(0);
		break;
	}
	if (nep == 0) {
22
←
Assuming 'nep' is not equal to 0→
23
←
Taking false branch→
		DPRINTF("%s: "do {} while(0)
		    "stop altnum %d\n", __func__, altnum)do {} while(0);
		break;	/* 0 is "stop sound", skip it */
	}
	if (!uaudio_process_as(sc, p, ifnum, altnum, nep))
24
←
Taking false branch→
		return 0;
}
}
2764done:
uaudio_fixup_params(sc);
26
←
Calling 'uaudio_fixup_params'→

/*
* Claim all interfaces we use. This prevents other uaudio(4)
* devices from trying to use them.
*/
for (a = sc->alts; a != NULL((void *)0); a = a->next)
usbd_claim_iface(sc->udev, a->ifnum);

usbd_claim_iface(sc->udev, sc->ctl_ifnum);

return 1;
2777}

2779/*
* Allocate a isochronous transfer and its bounce-buffers with the
* given maximum framesize and maximum frames per transfer.
*/
2783int
2784uaudio_xfer_alloc(struct uaudio_softc *sc, struct uaudio_xfer *xfer,
unsigned int framesize, unsigned int count)
2786{
xfer->usb_xfer = usbd_alloc_xfer(sc->udev);
if (xfer->usb_xfer == NULL((void *)0))
return ENOMEM12;

xfer->buf = usbd_alloc_buffer(xfer->usb_xfer, framesize * count);
if (xfer->buf == NULL((void *)0))
return ENOMEM12;

xfer->sizes = mallocarray(count,
   sizeof(xfer->sizes[0]), M_USBDEV102, M_WAITOK0x0001);
if (xfer->sizes == NULL((void *)0))
return ENOMEM12;

return 0;
2801}

2803/*
* Free a isochronous transfer and its bounce-buffers.
*/
2806void
2807uaudio_xfer_free(struct uaudio_softc *sc, struct uaudio_xfer *xfer,
unsigned int count)
2809{
if (xfer->usb_xfer != NULL((void *)0)) {
/* frees request buffer as well */
usbd_free_xfer(xfer->usb_xfer);
xfer->usb_xfer = NULL((void *)0);
}
if (xfer->sizes != NULL((void *)0)) {
free(xfer->sizes, M_USBDEV102,
    sizeof(xfer->sizes[0]) * count);
xfer->sizes = NULL((void *)0);
}
2820}

2822/*
* Close a stream and free all associated resources
*/
2825void
2826uaudio_stream_close(struct uaudio_softc *sc, int dir)
2827{
struct uaudio_stream *s = &sc->pstream;
struct uaudio_alt *a = sc->params->palt;
struct usbd_interface *iface;
int err, i;

if (dir == AUMODE_PLAY0x01) {
s = &sc->pstream;
a = sc->params->palt;
} else {
s = &sc->rstream;
a = sc->params->ralt;
}

if (s->data_pipe) {
usbd_close_pipe(s->data_pipe);
s->data_pipe = NULL((void *)0);
}

if (s->sync_pipe) {
usbd_close_pipe(s->sync_pipe);
s->sync_pipe = NULL((void *)0);
}

err = usbd_device2interface_handle(sc->udev, a->ifnum, &iface);
if (err)
printf("%s: can't get iface handle\n", DEVNAME(sc)((sc)->dev.dv_xname));
else {
err = usbd_set_interface(iface, 0);
if (err)
	printf("%s: can't reset interface\n", DEVNAME(sc)((sc)->dev.dv_xname));
}

for (i = 0; i < UAUDIO_NXFERS_MAX8; i++) {
uaudio_xfer_free(sc, s->data_xfers + i, s->nframes_max);
uaudio_xfer_free(sc, s->sync_xfers + i, 1);
}
2864}

2866/*
* Open a stream with the given buffer settings and set the current
* interface alt setting.
*/
2870int
2871uaudio_stream_open(struct uaudio_softc *sc, int dir,
  void *start, void *end, size_t blksz, void (*intr)(void *), void *arg)
2873{
struct uaudio_stream *s;
struct uaudio_alt *a;
struct usbd_interface *iface;
unsigned char req_buf[4];
unsigned int bpa, spf_max, min_blksz;
int err, clock_id, i;

if (dir == AUMODE_PLAY0x01) {
s = &sc->pstream;
a = sc->params->palt;
} else {
s = &sc->rstream;
a = sc->params->ralt;
}

for (i = 0; i < UAUDIO_NXFERS_MAX8; i++) {
s->data_xfers[i].usb_xfer = NULL((void *)0);
s->data_xfers[i].sizes = NULL((void *)0);
s->sync_xfers[i].usb_xfer = NULL((void *)0);
s->sync_xfers[i].sizes = NULL((void *)0);
}
s->data_pipe = NULL((void *)0);
s->sync_pipe = NULL((void *)0);

s->nframes_mask = 0;
i = a->fps;
while (i > 1000) {
s->nframes_mask = (s->nframes_mask << 1) | 1;
i >>= 1;
}

/* bytes per audio frame */
bpa = a->bps * a->nch;

/* ideal samples per usb frame, fixed-point */
s->spf = (uint64_t)sc->rate * UAUDIO_SPF_DIV327680 / a->fps;

/*
* UAC2.0 spec allows 1000PPM tolerance in sample frequency,
* while USB1.1 requires 1Hz, which is 125PPM at 8kHz. We
* accept as much as 1/256, which is 2500PPM.
*/
s->spf_min = (uint64_t)s->spf * 255 / 256;
s->spf_max = (uint64_t)s->spf * 257 / 256;

/* max spf can't exceed the device usb packet size */
spf_max = (a->maxpkt / bpa) * UAUDIO_SPF_DIV327680;
if (s->spf > spf_max) {
printf("%s: samples per frame too large\n", DEVNAME(sc)((sc)->dev.dv_xname));
return EIO5;
}
if (s->spf_max > spf_max)
s->spf_max = spf_max;

/*
* Upon transfer completion the device must reach the audio
* block boundary, which is propagated to upper layers. In the
* worst case, we schedule only frames of spf_max samples, but
* the device returns only frames of spf_min samples; in this
* case the amount actually transferred is at least:
*
*		min_blksz = blksz / spf_max * spf_min
*
* As we've UAUDIO_NXFERS outstanding blocks, worst-case
* remaining bytes is at most:
*
*		UAUDIO_NXFERS * (blksz - min_blksz)
*/
min_blksz = (((uint64_t)blksz << 32) / s->spf_max * s->spf_min) >> 32;

/* round to sample size */
min_blksz -= min_blksz % bpa;

/* finally this is what ensures we cross block boundary */
s->safe_blksz = blksz + UAUDIO_NXFERS_MAX8 * (blksz - min_blksz);

/* max number of (micro-)frames we'll ever use */
s->nframes_max = (uint64_t)(s->safe_blksz / bpa) *
   UAUDIO_SPF_DIV327680 / s->spf_min + 1;

/* round to next usb1.1 frame */
s->nframes_max = (s->nframes_max + s->nframes_mask) &
   ~s->nframes_mask;

/* this is the max packet size we'll ever need */
s->maxpkt = bpa *
   ((s->spf_max + UAUDIO_SPF_DIV327680 - 1) / UAUDIO_SPF_DIV327680);

/* how many xfers we need to fill sc->host_nframes */
s->nxfers = sc->host_nframes / s->nframes_max;
if (s->nxfers > UAUDIO_NXFERS_MAX8)
s->nxfers = UAUDIO_NXFERS_MAX8;

DPRINTF("%s: %s: blksz = %zu, rate = %u, fps = %u\n", __func__,do {} while(0)
   dir == AUMODE_PLAY ? "play" : "rec", blksz, sc->rate, a->fps)do {} while(0);
DPRINTF("%s: spf = 0x%x in [0x%x:0x%x]\n", __func__,do {} while(0)
   s->spf, s->spf_min, s->spf_max)do {} while(0);
DPRINTF("%s: nframes_max = %u, nframes_mask = %u, maxpkt = %u\n",do {} while(0)
   __func__, s->nframes_max, s->nframes_mask, s->maxpkt)do {} while(0);
DPRINTF("%s: safe_blksz = %d, nxfers = %d\n", __func__,do {} while(0)
   s->safe_blksz, s->nxfers)do {} while(0);

if (s->nxfers < UAUDIO_NXFERS_MIN2) {
printf("%s: block size too large\n", DEVNAME(sc)((sc)->dev.dv_xname));
return EIO5;
}

/*
* Require at least 2ms block size to ensure no
* transfer exceeds two blocks.
* 
* XXX: use s->nframes_mask instead of 1000
*/
if (1000 * blksz < 2 * sc->rate * bpa) {
printf("%s: audio block too small\n", DEVNAME(sc)((sc)->dev.dv_xname));
return EIO5;
}

for (i = 0; i < s->nxfers; i++) {
err = uaudio_xfer_alloc(sc, s->data_xfers + i,
    s->maxpkt, s->nframes_max);
if (err)
	goto failed;
if (a->sync_addr) {
	err = uaudio_xfer_alloc(sc, s->sync_xfers + i,
	    sc->sync_pktsz, 1);
	if (err)
		goto failed;
}
}

err = usbd_device2interface_handle(sc->udev, a->ifnum, &iface);
if (err) {
printf("%s: can't get iface handle\n", DEVNAME(sc)((sc)->dev.dv_xname));
goto failed;
}

err = usbd_set_interface(iface, a->altnum);
if (err) {
printf("%s: can't set interface\n", DEVNAME(sc)((sc)->dev.dv_xname));
goto failed;
}

/*
* Set the sample rate.
*
* Certain devices are able to lock their clock to the data
* rate and expose no frequency control. In this case, the
* request to set the frequency will fail, but this error is
* safe to ignore.
*
* Such devices expose this capability in the class-specific
* endpoint descriptor (UAC v1.0) or in the clock unit
* descriptor (UAC v2.0) but we don't want to use them for now
* as certain devices have them wrong, missing or misplaced.
*/
switch (sc->version) {
case UAUDIO_V10x100:
req_buf[0] = sc->rate;
req_buf[1] = sc->rate >> 8;
req_buf[2] = sc->rate >> 16;
if (!uaudio_req(sc, UT_WRITE_CLASS_ENDPOINT(0x00 | 0x20 | 0x02),
	UAUDIO_V1_REQ_SET_CUR0x01, UAUDIO_REQSEL_RATE0x01, 0,
	a->data_addr, 0, req_buf, 3)) {
	DPRINTF("%s: not setting endpoint rate\n", __func__)do {} while(0);
}
break;
case UAUDIO_V20x200:
req_buf[0] = sc->rate;
req_buf[1] = sc->rate >> 8;
req_buf[2] = sc->rate >> 16;
req_buf[3] = sc->rate >> 24;
clock_id = uaudio_clock_id(sc);
if (clock_id < 0) {
	printf("%s: can't get clock id\n", DEVNAME(sc)((sc)->dev.dv_xname));
	goto failed;
}
if (!uaudio_req(sc, UT_WRITE_CLASS_INTERFACE(0x00 | 0x20 | 0x01),
	UAUDIO_V2_REQ_CUR1, UAUDIO_REQSEL_RATE0x01, 0,
	sc->ctl_ifnum, clock_id, req_buf, 4)) {
	DPRINTF("%s: not setting clock rate\n", __func__)do {} while(0);
}
break;
}

err = usbd_open_pipe(iface, a->data_addr, 0, &s->data_pipe);
if (err) {
printf("%s: can't open data pipe\n", DEVNAME(sc)((sc)->dev.dv_xname));
goto failed;
}

if (a->sync_addr) {
err = usbd_open_pipe(iface, a->sync_addr, 0, &s->sync_pipe);
if (err) {
	printf("%s: can't open sync pipe\n", DEVNAME(sc)((sc)->dev.dv_xname));
	goto failed;
}
}

s->data_nextxfer = 0;
s->sync_nextxfer = 0;
s->spf_remain = 0;

s->intr = intr;
s->arg = arg;
s->ring_start = start;
s->ring_end = end;
s->ring_blksz = blksz;

s->ring_pos = s->ring_start;
s->ring_offs = 0;
s->ring_icnt = 0;

s->ubuf_xfer = 0;
s->ubuf_pos = 0;
return 0;

3091failed:
uaudio_stream_close(sc, dir);
return ENOMEM12;
3094}

3096/*
* Adjust play samples-per-frame to keep play and rec streams in sync.
*/
3099void
3100uaudio_adjspf(struct uaudio_softc *sc)
3101{
struct uaudio_stream *s = &sc->pstream;
int diff;

if (sc->mode != (AUMODE_RECORD0x02 | AUMODE_PLAY0x01))
return;
if (s->sync_pipe != NULL((void *)0))
return;

/*
* number of samples play stream is ahead of record stream.
*/
diff = sc->diff_nsamp;
if (sc->diff_nframes > 0) {
diff -= (uint64_t)sc->pstream.spf *
    sc->diff_nframes / UAUDIO_SPF_DIV327680;
} else {
diff += (uint64_t)sc->rstream.spf *
    -sc->diff_nframes / UAUDIO_SPF_DIV327680;
}

/*
* adjust samples-per-frames to resync within the next second
*/
s->spf = (uint64_t)(sc->rate - diff) * UAUDIO_SPF_DIV327680 / sc->ufps;
if (s->spf > s->spf_max)
s->spf = s->spf_max;
else if (s->spf < s->spf_min)
s->spf = s->spf_min;
3130#ifdef UAUDIO_DEBUG
if (uaudio_debug >= 2)
printf("%s: diff = %d, spf = 0x%x\n", __func__, diff, s->spf);
3133#endif
3134}

3136/*
* Copy one audio block to the xfer buffer.
*/
3139void
3140uaudio_pdata_copy(struct uaudio_softc *sc)
3141{
struct uaudio_stream *s = &sc->pstream;
struct uaudio_xfer *xfer;
size_t count, avail;
int index;
3146#ifdef UAUDIO_DEBUG
struct timeval tv;

getmicrotime(&tv);
3150#endif
while (sc->copy_todo > 0 && s->ubuf_xfer < s->nxfers) {
index = s->data_nextxfer + s->ubuf_xfer;
if (index >= s->nxfers)
	index -= s->nxfers;
xfer = s->data_xfers + index;
avail = s->ring_end - s->ring_pos;
count = xfer->size - s->ubuf_pos;
if (count > avail)
	count = avail;
if (count > sc->copy_todo)
	count = sc->copy_todo;
3162#ifdef UAUDIO_DEBUG
if (uaudio_debug >= 2) {
	printf("%s: %llu.%06lu: %zd..%zd -> %u:%u..%zu\n",
	    __func__, tv.tv_sec, tv.tv_usec,
	    s->ring_pos - s->ring_start,
	    s->ring_pos - s->ring_start + count,
	    s->ubuf_xfer, s->ubuf_pos, s->ubuf_pos + count);
}
3170#endif
memcpy(xfer->buf + s->ubuf_pos, s->ring_pos, count)__builtin_memcpy((xfer->buf + s->ubuf_pos), (s->ring_pos
), (count));
sc->copy_todo -= count;
s->ring_pos += count;
if (s->ring_pos == s->ring_end) {
	s->ring_pos = s->ring_start;
}
s->ubuf_pos += count;
if (s->ubuf_pos == xfer->size) {
	usb_syncmem(&xfer->usb_xfer->dmabuf, 0, xfer->size,
	    BUS_DMASYNC_PREWRITE0x04);
	s->ubuf_pos = 0;
3182#ifdef DIAGNOSTIC1
	if (s->ubuf_xfer == s->nxfers) {
		printf("%s: overflow\n", __func__);
		return;
	}
3187#endif
	s->ubuf_xfer++;
}
}
3191}

3193/*
* Calculate and fill xfer frames sizes.
*/
3196void
3197uaudio_pdata_calcsizes(struct uaudio_softc *sc, struct uaudio_xfer *xfer)
3198{
3199#ifdef UAUDIO_DEBUG
struct timeval tv;
3201#endif
struct uaudio_stream *s = &sc->pstream;
struct uaudio_alt *a = sc->params->palt;
unsigned int fsize, bpf;
int done;

bpf = a->bps * a->nch;
done = s->ring_offs;
xfer->nframes = 0;

while (1) {
/*
 * if we crossed the next block boundary, we're done
 */
if ((xfer->nframes & s->nframes_mask) == 0 &&
    done > s->safe_blksz)
	break;

/*
 * this can't happen, debug only
 */
if (xfer->nframes == s->nframes_max) {
	printf("%s: too many frames for play xfer: "
	    "done = %u, blksz = %d\n",
	    DEVNAME(sc)((sc)->dev.dv_xname), done, s->ring_blksz);
	break;
}

/*
 * calculate frame size and adjust state
 */
s->spf_remain += s->spf;
fsize = s->spf_remain / UAUDIO_SPF_DIV327680 * bpf;
s->spf_remain %= UAUDIO_SPF_DIV327680;
done += fsize;
xfer->sizes[xfer->nframes] = fsize;
xfer->nframes++;
}

xfer->size = done - s->ring_offs;
s->ring_offs = done - s->ring_blksz;

3243#ifdef UAUDIO_DEBUG
if (uaudio_debug >= 3) {
getmicrotime(&tv);
printf("%s: size = %d, offs -> %d\n", __func__,
    xfer->size, s->ring_offs);
}
3249#endif
memset(xfer->buf, 0, xfer->size)__builtin_memset((xfer->buf), (0), (xfer->size));
3251}

3253/*
* Submit a play data transfer to the USB driver.
*/
3256void
3257uaudio_pdata_xfer(struct uaudio_softc *sc)
3258{
3259#ifdef UAUDIO_DEBUG
struct timeval tv;
3261#endif
struct uaudio_stream *s = &sc->pstream;
struct uaudio_xfer *xfer;
int err;

xfer = s->data_xfers + s->data_nextxfer;

3268#ifdef UAUDIO_DEBUG
if (uaudio_debug >= 3) {
getmicrotime(&tv);
printf("%s: %llu.%06lu: "
    "%d bytes, %u frames, remain = 0x%x, offs = %d\n",
    __func__, tv.tv_sec, tv.tv_usec,
    xfer->size, xfer->nframes,
    s->spf_remain, s->ring_offs);
}
3277#endif

/* this can't happen, debug only */
if (xfer->nframes == 0) {
printf("%s: zero frame play xfer\n", DEVNAME(sc)((sc)->dev.dv_xname));
return;
}

/*
* We accept short transfers because in case of babble/stale frames
* the transfer will be short
*/
usbd_setup_isoc_xfer(xfer->usb_xfer, s->data_pipe, sc,
   xfer->sizes, xfer->nframes,
   USBD_NO_COPY0x01 | USBD_SHORT_XFER_OK0x04,
   uaudio_pdata_intr);

err = usbd_transfer(xfer->usb_xfer);
if (err != 0 && err != USBD_IN_PROGRESS)
printf("%s: play xfer, err = %d\n", DEVNAME(sc)((sc)->dev.dv_xname), err);

if (++s->data_nextxfer == s->nxfers)
s->data_nextxfer = 0;
3300}

3302/*
* Callback called by the USB driver upon completion of play data transfer.
*/
3305void
3306uaudio_pdata_intr(struct usbd_xfer *usb_xfer, void *arg, usbd_status status)
3307{
3308#ifdef UAUDIO_DEBUG
struct timeval tv;
3310#endif
struct uaudio_softc *sc = arg;
struct uaudio_stream *s = &sc->pstream;
struct uaudio_xfer *xfer;
uint32_t size;
int nintr;

if (status != 0 && status != USBD_IOERROR) {
DPRINTF("%s: xfer status = %d\n", __func__, status)do {} while(0);
return;
}

xfer = s->data_xfers + s->data_nextxfer;
if (xfer->usb_xfer != usb_xfer) {
DPRINTF("%s: wrong xfer\n", __func__)do {} while(0);
return;
}

sc->diff_nsamp += xfer->size /
   (sc->params->palt->nch * sc->params->palt->bps);
sc->diff_nframes += xfer->nframes;

3332#ifdef UAUDIO_DEBUG
if (uaudio_debug >= 2) {
getmicrotime(&tv);
printf("%s: %llu.%06lu: %u: %u bytes\n",
    __func__, tv.tv_sec, tv.tv_usec,
    s->data_nextxfer, xfer->size);
}
3339#endif
usbd_get_xfer_status(usb_xfer, NULL((void *)0), NULL((void *)0), &size, NULL((void *)0));
if (size != xfer->size) {
DPRINTF("%s: %u bytes out of %u: incomplete play xfer\n",do {} while(0)
    DEVNAME(sc), size, xfer->size)do {} while(0);
}

/*
* Upper layer call-back may call uaudio_underrun(), which
* needs the current size of this transfer. So, don't
* recalculate the sizes and don't schedule the transfer yet.
*/
s->ring_icnt += xfer->size;
nintr = 0;
mtx_enter(&audio_lock);
while (s->ring_icnt >= s->ring_blksz) {
s->intr(s->arg);
s->ring_icnt -= s->ring_blksz;
nintr++;
}
mtx_leave(&audio_lock);
if (nintr != 1)
printf("%s: %d: bad play intr count\n", __func__, nintr);

uaudio_pdata_calcsizes(sc, xfer);
uaudio_pdata_xfer(sc);
3365#ifdef DIAGNOSTIC1
if (s->ubuf_xfer == 0) {
printf("%s: underflow\n", __func__);
return;
}
3370#endif
s->ubuf_xfer--;
uaudio_pdata_copy(sc);
3373}

3375/*
* Submit a play sync transfer to the USB driver.
*/
3378void
3379uaudio_psync_xfer(struct uaudio_softc *sc)
3380{
3381#ifdef UAUDIO_DEBUG
struct timeval tv;
3383#endif
struct uaudio_stream *s = &sc->pstream;
struct uaudio_xfer *xfer;
unsigned int i;
int err;

xfer = s->sync_xfers + s->sync_nextxfer;
xfer->nframes = 1;

for (i = 0; i < xfer->nframes; i++)
xfer->sizes[i] = sc->sync_pktsz;

xfer->size = xfer->nframes * sc->sync_pktsz;

3397#ifdef UAUDIO_DEBUG
memset(xfer->buf, 0xd0, sc->sync_pktsz * xfer->nframes)__builtin_memset((xfer->buf), (0xd0), (sc->sync_pktsz *
 xfer->nframes));
3399#endif

usbd_setup_isoc_xfer(xfer->usb_xfer, s->sync_pipe, sc,
   xfer->sizes, xfer->nframes,
   USBD_NO_COPY0x01 | USBD_SHORT_XFER_OK0x04,
   uaudio_psync_intr);

err = usbd_transfer(xfer->usb_xfer);
if (err != 0 && err != USBD_IN_PROGRESS)
printf("%s: sync play xfer, err = %d\n", DEVNAME(sc)((sc)->dev.dv_xname), err);

if (++s->sync_nextxfer == s->nxfers)
s->sync_nextxfer = 0;

3413#ifdef UAUDIO_DEBUG
if (uaudio_debug >= 3) {
getmicrotime(&tv);
printf("%s: %llu.%06lu: %dB, %d fr\n", __func__,
    tv.tv_sec, tv.tv_usec, sc->sync_pktsz, xfer->nframes);
}
3419#endif
3420}

3422/*
* Callback called by the USB driver upon completion of play sync transfer.
*/
3425void
3426uaudio_psync_intr(struct usbd_xfer *usb_xfer, void *arg, usbd_status status)
3427{
3428#ifdef UAUDIO_DEBUG
struct timeval tv;
3430#endif
struct uaudio_softc *sc = arg;
struct uaudio_stream *s = &sc->pstream;
struct uaudio_xfer *xfer;
unsigned char *buf;
unsigned int i;
int32_t val;

if (status != 0) {
DPRINTF("%s: xfer status = %d\n", __func__, status)do {} while(0);
return;
}

xfer = s->sync_xfers + s->sync_nextxfer;
if (xfer->usb_xfer != usb_xfer) {
DPRINTF("%s: wrong xfer\n", __func__)do {} while(0);
return;
}

/* XXX: there's only one frame, the loop is not necessary */

buf = xfer->buf;
for (i = 0; i < xfer->nframes; i++) {
if (xfer->sizes[i] == sc->sync_pktsz) {
	val = buf[0] | buf[1] << 8 | buf[2] << 16;
	if (sc->sync_pktsz == 4)
		val |= xfer->buf[3] << 24;
	else
		val <<= 2;
	val *= UAUDIO_SPF_DIV327680 / (1 << 16);
3460#ifdef UAUDIO_DEBUG
	if (uaudio_debug >= 2) {
		getmicrotime(&tv);
		printf("%s: %llu.%06lu: spf: %08x\n",
		    __func__, tv.tv_sec, tv.tv_usec, val);
	}
3466#endif
	if (val > s->spf_max)
		s->spf = s->spf_max;
	else if (val < s->spf_min)
		s->spf = s->spf_min;
	else
		s->spf = val;
}
buf += sc->sync_pktsz;
}

uaudio_psync_xfer(sc);
3478}

3480/*
* Submit a rec data transfer to the USB driver.
*/
3483void
3484uaudio_rdata_xfer(struct uaudio_softc *sc)
3485{
3486#ifdef UAUDIO_DEBUG
struct timeval tv;
3488#endif
struct uaudio_stream *s = &sc->rstream;
struct uaudio_alt *a = sc->params->ralt;
struct uaudio_xfer *xfer;
unsigned int fsize, bpf;
int done;
int err;

xfer = s->data_xfers + s->data_nextxfer;
bpf = a->bps * a->nch;
xfer->nframes = 0;
done = s->ring_offs;

while (1) {
/*
 * if we crossed the next block boundary, we're done
 */
if ((xfer->nframes & s->nframes_mask) == 0 &&
    done > s->safe_blksz) {
done:
	xfer->size = done - s->ring_offs;
	s->ring_offs = done - s->ring_blksz;
	break;
}

/*
 * this can't happen, debug only
 */
if (xfer->nframes == s->nframes_max) {
	printf("%s: too many frames for rec xfer: "
	    "done = %d, blksz = %d\n",
	    DEVNAME(sc)((sc)->dev.dv_xname), done, s->ring_blksz);
	goto done;
}

/*
 * estimate next block using s->spf, but allow
 * transfers up to maxpkt
 */
s->spf_remain += s->spf;
fsize = s->spf_remain / UAUDIO_SPF_DIV327680 * bpf;
s->spf_remain %= UAUDIO_SPF_DIV327680;
done += fsize;
xfer->sizes[xfer->nframes] = s->maxpkt;
xfer->nframes++;
}

3535#ifdef UAUDIO_DEBUG
if (uaudio_debug >= 3) {
getmicrotime(&tv);
printf("%s: %llu.%06lu: "
    "%u fr, %d bytes (max %d), offs = %d\n",
    __func__, tv.tv_sec, tv.tv_usec,
    xfer->nframes, xfer->size,
    s->maxpkt * xfer->nframes, s->ring_offs);
}
3544#endif

/* this can't happen, debug only */
if (xfer->nframes == 0) {
printf("%s: zero frame rec xfer\n", DEVNAME(sc)((sc)->dev.dv_xname));
return;
}

3552#ifdef UAUDIO_DEBUG
memset(xfer->buf, 0xd0, s->maxpkt * xfer->nframes)__builtin_memset((xfer->buf), (0xd0), (s->maxpkt * xfer
->nframes));
3554#endif
usbd_setup_isoc_xfer(xfer->usb_xfer, s->data_pipe, sc,
   xfer->sizes, xfer->nframes, USBD_NO_COPY0x01 | USBD_SHORT_XFER_OK0x04,
   uaudio_rdata_intr);

err = usbd_transfer(xfer->usb_xfer);
if (err != 0 && err != USBD_IN_PROGRESS)
printf("%s: rec xfer, err = %d\n", DEVNAME(sc)((sc)->dev.dv_xname), err);

if (++s->data_nextxfer == s->nxfers)
s->data_nextxfer = 0;
3565}

3567/*
* Callback called by the USB driver upon completion of rec data transfer.
*/
3570void
3571uaudio_rdata_intr(struct usbd_xfer *usb_xfer, void *arg, usbd_status status)
3572{
3573#ifdef UAUDIO_DEBUG
struct timeval tv;
3575#endif
struct uaudio_softc *sc = arg;
struct uaudio_stream *s = &sc->rstream;
struct uaudio_alt *a = sc->params->ralt;
struct uaudio_xfer *xfer;
unsigned char *buf, *framebuf;
unsigned int count, fsize, fsize_min, nframes, bpf;
unsigned int data_size, null_count;
unsigned int nintr;

if (status != 0) {
DPRINTF("%s: xfer status = %d\n", __func__, status)do {} while(0);
return;
}

xfer = s->data_xfers + s->data_nextxfer;
if (xfer->usb_xfer != usb_xfer) {
DPRINTF("%s: wrong xfer\n", __func__)do {} while(0);
return;
}

bpf = a->bps * a->nch;
framebuf = xfer->buf;
nframes = 0;
null_count = 0;
data_size = 0;
fsize_min = s->spf_min / UAUDIO_SPF_DIV327680;
for (nframes = 0; nframes < xfer->nframes; nframes++) {

/*
 * Device clock may take some time to lock during which
 * we'd receive empty or incomplete packets for which we
 * need to generate silence.
 */
fsize = xfer->sizes[nframes];
if (fsize < fsize_min) {
	s->spf_remain += s->spf;
	fsize = s->spf_remain / UAUDIO_SPF_DIV327680 * bpf;
	s->spf_remain %= UAUDIO_SPF_DIV327680;
	memset(framebuf, 0, fsize)__builtin_memset((framebuf), (0), (fsize));
	null_count++;
}
data_size += fsize;

/*
 * fill ring from frame buffer, handling
 * boundary conditions
 */
buf = framebuf;
while (fsize > 0) {
	count = s->ring_end - s->ring_pos;
	if (count > fsize)
		count = fsize;
	memcpy(s->ring_pos, buf, count)__builtin_memcpy((s->ring_pos), (buf), (count));
	s->ring_pos += count;
	if (s->ring_pos == s->ring_end)
		s->ring_pos = s->ring_start;
	buf += count;
	fsize -= count;
}

framebuf += s->maxpkt;
}

s->ring_offs += data_size - xfer->size;
s->ring_icnt += data_size;

sc->diff_nsamp -= data_size /
   (sc->params->ralt->nch * sc->params->ralt->bps);
sc->diff_nframes -= xfer->nframes;

sc->adjspf_age += xfer->nframes;
if (sc->adjspf_age >= sc->ufps / 8) {
sc->adjspf_age -= sc->ufps / 8;
uaudio_adjspf(sc);
}

3652#ifdef UAUDIO_DEBUG
if (uaudio_debug >= 2) {
getmicrotime(&tv);
printf("%s: %llu.%06lu: %u: "
    "%u bytes of %u, offs -> %d\n",
    __func__, tv.tv_sec, tv.tv_usec,
    s->data_nextxfer, data_size, xfer->size, s->ring_offs);
}
if (null_count > 0) {
DPRINTF("%s: %u null frames out of %u: incomplete record xfer\n",do {} while(0)
    DEVNAME(sc), null_count, xfer->nframes)do {} while(0);
}
3664#endif
uaudio_rdata_xfer(sc);

nintr = 0;
mtx_enter(&audio_lock);
while (s->ring_icnt >= s->ring_blksz) {
s->intr(s->arg);
s->ring_icnt -= s->ring_blksz;
nintr++;
}
mtx_leave(&audio_lock);
if (nintr != 1)
printf("%s: %u: bad rec intr count\n", DEVNAME(sc)((sc)->dev.dv_xname), nintr);
3677}

3679/*
* Start simultaneously playback and recording, unless trigger_input()
* and trigger_output() were not both called yet.
*/
3683void
3684uaudio_trigger(struct uaudio_softc *sc)
3685{
int i, s;

if (sc->mode != sc->trigger_mode)
return;

DPRINTF("%s: preparing\n", __func__)do {} while(0);
if (sc->mode & AUMODE_PLAY0x01) {
for (i = 0; i < sc->pstream.nxfers; i++)
	uaudio_pdata_calcsizes(sc, sc->pstream.data_xfers + i);

uaudio_pdata_copy(sc);
}

sc->diff_nsamp = 0;
sc->diff_nframes = 0;
sc->adjspf_age = 0;

DPRINTF("%s: starting\n", __func__)do {} while(0);
s = splusb()splraise(0x2);
for (i = 0; i < UAUDIO_NXFERS_MAX8; i++) {
if ((sc->mode & AUMODE_PLAY0x01) && i < sc->pstream.nxfers) {
	if (sc->pstream.sync_pipe)
		uaudio_psync_xfer(sc);
	uaudio_pdata_xfer(sc);
}
if ((sc->mode & AUMODE_RECORD0x02) && i < sc->rstream.nxfers)
	uaudio_rdata_xfer(sc);
}
splx(s)spllower(s);
3715}

3717void
3718uaudio_print(struct uaudio_softc *sc)
3719{
struct uaudio_unit *u;
struct uaudio_mixent *m;
struct uaudio_params *p;
int pchan = 0, rchan = 0, async = 0;
int nctl = 0;

for (u = sc->unit_list; u != NULL((void *)0); u = u->unit_next) {
m = u->mixent_list;
while (1) {
	uaudio_mixer_skip(&m);
	if (m == NULL((void *)0))
		break;
	m = m->next;
	nctl++;
}
}

for (p = sc->params_list; p != NULL((void *)0); p = p->next) {
if (p->palt && p->palt->nch > pchan)
	pchan = p->palt->nch;
if (p->ralt && p->ralt->nch > rchan)
	rchan = p->ralt->nch;
if (p->palt && p->palt->sync_addr)
	async = 1;
if (p->ralt && p->ralt->sync_addr)
	async = 1;
}

printf("%s: class v%d, %s, %s, channels: %d play, %d rec, %d ctls\n",
   DEVNAME(sc)((sc)->dev.dv_xname),
   sc->version >> 8,
   sc->ufps == 1000 ? "full-speed" : "high-speed",
   async ? "async" : "sync",
   pchan, rchan, nctl);
3754}

3756int
3757uaudio_match(struct device *parent, void *match, void *aux)
3758{
struct usb_attach_arg *arg = aux;
struct usb_interface_descriptor *idesc;

if (arg->iface == NULL((void *)0) || arg->device == NULL((void *)0))
return UMATCH_NONE0;

idesc = usbd_get_interface_descriptor(arg->iface);
if (idesc == NULL((void *)0)) {
DPRINTF("%s: couldn't get idesc\n", __func__)do {} while(0);
return UMATCH_NONE0;
}

if (idesc->bInterfaceClass != UICLASS_AUDIO0x01 ||
   idesc->bInterfaceSubClass != UISUBCLASS_AUDIOSTREAM2)
return UMATCH_NONE0;

return UMATCH_VENDOR_PRODUCT_CONF_IFACE8;
3776}

3778void
3779uaudio_attach(struct device *parent, struct device *self, void *aux)
3780{
struct uaudio_softc *sc = (struct uaudio_softc *)self;
struct usb_attach_arg *arg = aux;
struct usb_config_descriptor *cdesc;
struct uaudio_blob desc;

/*
* this device has audio AC or AS or MS interface, get the
* full config descriptor and attach audio devices
*/

cdesc = usbd_get_config_descriptor(arg->device);
if (cdesc == NULL((void *)0))
1
Assuming 'cdesc' is not equal to NULL→
2
←
Taking false branch→
return;

desc.rptr = (unsigned char *)cdesc;
desc.wptr = desc.rptr + UGETW(cdesc->wTotalLength)(*(u_int16_t *)(cdesc->wTotalLength));

sc->udev = arg->device;
sc->unit_list = NULL((void *)0);
sc->names = NULL((void *)0);
sc->alts = NULL((void *)0);
sc->params_list = NULL((void *)0);
sc->clock = NULL((void *)0);
sc->params = NULL((void *)0);
sc->rate = 0;
sc->mode = 0;
sc->trigger_mode = 0;
sc->copy_todo = 0;

/*
* Ideally the USB host controller should expose the number of
* frames we're allowed to schedule, but there's no such
* interface. The uhci(4) driver can buffer up to 128 frames
* (or it crashes), ehci(4) starts recording null frames if we
* exceed 256 (micro-)frames, ohci(4) works with at most 50
* frames.
*/
switch (sc->udev->speed) {
3
←
Control jumps to 'case 3:'  at line 3825→
case USB_SPEED_LOW1:
case USB_SPEED_FULL2:
sc->ufps = 1000;
sc->sync_pktsz = 3;
sc->host_nframes = 50;
break;
case USB_SPEED_HIGH3:
case USB_SPEED_SUPER4:
sc->ufps = 8000;
sc->sync_pktsz = 4;
sc->host_nframes = 240;
break;
default:
printf("%s: unsupported bus speed\n", DEVNAME(sc)((sc)->dev.dv_xname));
return;
}

if (!uaudio_process_conf(sc, &desc))
4
←
 Execution continues on line 3836→
5
←
Calling 'uaudio_process_conf'→
return;

3839#ifdef UAUDIO_DEBUG
if (uaudio_debug)
uaudio_conf_print(sc);
3842#endif
/* print a nice uaudio attach line */
uaudio_print(sc);

audio_attach_mi(&uaudio_hw_if, sc, arg->cookie, &sc->dev);
3847}

3849int
3850uaudio_detach(struct device *self, int flags)
3851{
struct uaudio_softc *sc = (struct uaudio_softc *)self;
struct uaudio_unit *unit;
struct uaudio_params *params;
struct uaudio_alt *alt;
struct uaudio_name *name;
struct uaudio_mixent *mixent;
int rv;

rv = config_detach_children(self, flags);

usbd_ref_wait(sc->udev);

while ((alt = sc->alts) != NULL((void *)0)) {
sc->alts = alt->next;
free(alt, M_USBDEV102, sizeof(struct uaudio_alt));
}

while ((params = sc->params_list) != NULL((void *)0)) {
sc->params_list = params->next;
free(params, M_USBDEV102, sizeof(struct uaudio_params));
}

while ((unit = sc->unit_list) != NULL((void *)0)) {
sc->unit_list = unit->unit_next;
while ((mixent = unit->mixent_list) != NULL((void *)0)) {
	unit->mixent_list = mixent->next;
	uaudio_ranges_clear(&mixent->ranges);
	free(mixent, M_USBDEV102, sizeof(struct uaudio_mixent));
}
uaudio_ranges_clear(&unit->rates);
free(unit, M_USBDEV102, sizeof(struct uaudio_unit));
}

while ((name = sc->names)) {
sc->names = name->next;
free(name, M_USBDEV102, sizeof(struct uaudio_name));
}

return rv;
3891}

3893int
3894uaudio_open(void *self, int flags)
3895{
struct uaudio_softc *sc = self;
struct uaudio_params *p;

if (usbd_is_dying(sc->udev))
return EIO5;

usbd_ref_incr(sc->udev);

flags &= (FREAD0x0001 | FWRITE0x0002);

for (p = sc->params_list; p != NULL((void *)0); p = p->next) {
switch (flags) {
case FWRITE0x0002:
	if (!p->palt)
		break;
	sc->mode = AUMODE_PLAY0x01;
	return 0;
case FREAD0x0001:
	if (!p->ralt)
		break;
	sc->mode = AUMODE_RECORD0x02;
	return 0;
case FREAD0x0001 | FWRITE0x0002:
	if (!(p->ralt && p->palt))
		break;
	sc->mode = AUMODE_RECORD0x02 | AUMODE_PLAY0x01;
	return 0;
}
}

usbd_ref_decr(sc->udev);
return ENXIO6;
3928}

3930void
3931uaudio_close(void *self)
3932{
struct uaudio_softc *sc = self;

sc->mode = 0;
usbd_ref_decr(sc->udev);
3937}

3939int
3940uaudio_set_params(void *self, int setmode, int usemode,
  struct audio_params *ap, struct audio_params *ar)
3942{
struct uaudio_softc *sc = (struct uaudio_softc *)self;
struct uaudio_params *p, *best_mode, *best_rate, *best_nch;
int rate, rateindex;

3947#ifdef DIAGNOSTIC1
if (setmode != usemode || setmode != sc->mode) {
printf("%s: bad call to uaudio_set_params()\n", DEVNAME(sc)((sc)->dev.dv_xname));
return EINVAL22;
}
if (sc->mode == 0) {
printf("%s: uaudio_set_params(): not open\n", DEVNAME(sc)((sc)->dev.dv_xname));
return EINVAL22;
}
3956#endif
/*
* audio(4) layer requests equal play and record rates
*/
rate = (sc->mode & AUMODE_PLAY0x01) ? ap->sample_rate : ar->sample_rate;
rateindex = uaudio_rates_indexof(~0, rate);

DPRINTF("%s: rate %d -> %d (index %d)\n", __func__,do {} while(0)
   rate, uaudio_rates[rateindex], rateindex)do {} while(0);

best_mode = best_rate = best_nch = NULL((void *)0);

for (p = sc->params_list; p != NULL((void *)0); p = p->next) {

/* test if params match the requested mode */
if (sc->mode & AUMODE_PLAY0x01) {
	if (p->palt == NULL((void *)0))
		continue;
}
if (sc->mode & AUMODE_RECORD0x02) {
	if (p->ralt == NULL((void *)0))
		continue;
}
if (best_mode == NULL((void *)0))
	best_mode = p;

/* test if params match the requested rate */
if ((uaudio_getrates(sc, p) & (1 << rateindex)) == 0)
	continue;
if (best_rate == NULL((void *)0))
	best_rate = p;

/* test if params match the requested channel counts */
if (sc->mode & AUMODE_PLAY0x01) {
	if (p->palt->nch != ap->channels)
		continue;
}
if (sc->mode & AUMODE_RECORD0x02) {
	if (p->ralt->nch != ar->channels)
		continue;
}
if (best_nch == NULL((void *)0))
	best_nch = p;

/* test if params match the requested precision */
if (sc->mode & AUMODE_PLAY0x01) {
	if (p->palt->bits != ap->precision)
		continue;
}
if (sc->mode & AUMODE_RECORD0x02) {
	if (p->ralt->bits != ar->precision)
		continue;
}

/* everything matched, we're done */
break;
}

if (p == NULL((void *)0)) {
if (best_nch)
	p = best_nch;
else if (best_rate)
	p = best_rate;
else if (best_mode)
	p = best_mode;
else
	return ENOTTY25;
}

/*
* Recalculate rate index, because the chosen parameters
* may not support the requested one
*/
rateindex = uaudio_rates_indexof(uaudio_getrates(sc, p), rate);
if (rateindex < 0)
return ENOTTY25;

sc->params = p;
sc->rate = uaudio_rates[rateindex];

DPRINTF("%s: rate = %u\n", __func__, sc->rate)do {} while(0);

if (sc->mode & AUMODE_PLAY0x01) {
ap->sample_rate = sc->rate;
ap->precision = p->palt->bits;
ap->encoding = AUDIO_ENCODING_SLINEAR_LE6;
ap->bps = p->palt->bps;
ap->msb = 1;
ap->channels = p->palt->nch;
}
if (sc->mode & AUMODE_RECORD0x02) {
ar->sample_rate = sc->rate;
ar->precision = p->ralt->bits;
ar->encoding = AUDIO_ENCODING_SLINEAR_LE6;
ar->bps = p->ralt->bps;
ar->msb = 1;
ar->channels = p->ralt->nch;
}

return 0;
4056}

4058unsigned int
4059uaudio_set_blksz(void *self, int mode,
  struct audio_params *p, struct audio_params *r, unsigned int blksz)
4061{
struct uaudio_softc *sc = self;
unsigned int fps, fps_min;
unsigned int blksz_max, blksz_min;

/*
* minimum block size is two transfers, see uaudio_stream_open()
*/
fps_min = sc->ufps;
if (mode & AUMODE_PLAY0x01) {
fps = sc->params->palt->fps;
if (fps_min > fps)
	fps_min = fps;
}
if (mode & AUMODE_RECORD0x02) {
fps = sc->params->ralt->fps;
if (fps_min > fps)
	fps_min = fps;
}
blksz_min = (sc->rate * 2 + fps_min - 1) / fps_min;

/*
* max block size is only limited by the number of frames the
* host can schedule
*/
blksz_max = sc->rate * (sc->host_nframes / UAUDIO_NXFERS_MIN2) /
   sc->ufps * 85 / 100;

if (blksz > blksz_max)
blksz = blksz_max;
else if (blksz < blksz_min)
blksz = blksz_min;

return blksz;
4095}

4097int
4098uaudio_trigger_output(void *self, void *start, void *end, int blksz,
  void (*intr)(void *), void *arg, struct audio_params *param)
4100{
struct uaudio_softc *sc = self;
int err;

err = uaudio_stream_open(sc,
   AUMODE_PLAY0x01, start, end, blksz, intr, arg);
if (err)
return err;

sc->trigger_mode |= AUMODE_PLAY0x01;
uaudio_trigger(sc);
return 0;
4112}

4114int
4115uaudio_trigger_input(void *self, void *start, void *end, int blksz,
  void (*intr)(void *), void *arg, struct audio_params *param)
4117{
struct uaudio_softc *sc = self;
int err;

err = uaudio_stream_open(sc,
   AUMODE_RECORD0x02, start, end, blksz, intr, arg);
if (err)
return err;

sc->trigger_mode |= AUMODE_RECORD0x02;
uaudio_trigger(sc);
return 0;
4129}

4131void
4132uaudio_copy_output(void *self, size_t todo)
4133{
struct uaudio_softc *sc = (struct uaudio_softc *)self;
int s;

s = splusb()splraise(0x2);
sc->copy_todo += todo;

4140#ifdef UAUDIO_DEBUG
if (uaudio_debug >= 3) {
printf("%s: copy_todo -> %zd (+%zd)\n", __func__,
    sc->copy_todo, todo);
}
4145#endif

if (sc->mode == sc->trigger_mode)
uaudio_pdata_copy(sc);
splx(s)spllower(s);
4150}

4152void
4153uaudio_underrun(void *self)
4154{
struct uaudio_softc *sc = (struct uaudio_softc *)self;
struct uaudio_stream *s = &sc->pstream;

sc->copy_todo += s->ring_blksz;

4160#ifdef UAUDIO_DEBUG
if (uaudio_debug >= 3)
printf("%s: copy_todo -> %zd\n", __func__, sc->copy_todo);
4163#endif

/* copy data (actually silence) produced by the audio(4) layer */
uaudio_pdata_copy(sc);
4167}

4169int
4170uaudio_halt_output(void *self)
4171{
struct uaudio_softc *sc = (struct uaudio_softc *)self;

uaudio_stream_close(sc, AUMODE_PLAY0x01);
sc->trigger_mode &= ~AUMODE_PLAY0x01;
sc->copy_todo = 0;
return 0;
4178}

4180int
4181uaudio_halt_input(void *self)
4182{
struct uaudio_softc *sc = (struct uaudio_softc *)self;

uaudio_stream_close(sc, AUMODE_RECORD0x02);
sc->trigger_mode &= ~AUMODE_RECORD0x02;
return 0;
4188}

4190int
4191uaudio_get_port_do(struct uaudio_softc *sc, struct mixer_ctrl *ctl)
4192{
struct uaudio_unit *u;
struct uaudio_mixent *m;
unsigned char req_buf[4];
struct uaudio_blob p;
int i, nch, val, req_num;

if (!uaudio_mixer_byindex(sc, ctl->dev, &u, &m))
return ENOENT2;

switch (sc->version) {
case UAUDIO_V10x100:
req_num = UAUDIO_V1_REQ_GET_CUR0x81;
break;
case UAUDIO_V20x200:
req_num = UAUDIO_V2_REQ_CUR1;
}

switch (m->type) {
case UAUDIO_MIX_SW0:
p.rptr = p.wptr = req_buf;
if (!uaudio_req(sc,
	UT_READ_CLASS_INTERFACE(0x80 | 0x20 | 0x01),
	req_num,
	m->req_sel,
	m->chan < 0 ? 0 : m->chan,
	sc->ctl_ifnum,
	u->id,
	req_buf,
	1))
	return EIO5;
p.wptr++;
if (!uaudio_getnum(&p, 1, &val))
	return EIO5;
ctl->un.ord = !!val;
break;
case UAUDIO_MIX_NUM1:
nch = uaudio_mixer_nchan(m, NULL((void *)0));
ctl->un.value.num_channels = nch;
for (i = 0; i < nch; i++) {
	p.rptr = p.wptr = req_buf;
	if (!uaudio_req(sc,
		UT_READ_CLASS_INTERFACE(0x80 | 0x20 | 0x01),
		req_num,
		m->req_sel,
		m->chan < 0 ? 0 : i + 1,
		sc->ctl_ifnum,
		u->id,
		req_buf,
		2))
		return EIO5;
	p.wptr += 2;
	if (!uaudio_getnum(&p, 2, &val))
		return EIO5;
	ctl->un.value.level[i] =
	    uaudio_ranges_decode(&m->ranges,
		uaudio_sign_expand(val, 2));
	m = m->next;
}
break;
case UAUDIO_MIX_ENUM2:
/* XXX: not used yet */
break;
}
return 0;
4257}

4259int
4260uaudio_set_port_do(struct uaudio_softc *sc, struct mixer_ctrl *ctl)
4261{
struct uaudio_unit *u;
struct uaudio_mixent *m;
unsigned char req_buf[4];
unsigned int val;
int i, nch;

if (!uaudio_mixer_byindex(sc, ctl->dev, &u, &m))
return ENOENT2;

switch (m->type) {
case UAUDIO_MIX_SW0:
if (ctl->un.ord < 0 || ctl->un.ord > 1)
	return EINVAL22;
req_buf[0] = ctl->un.ord;
if (!uaudio_req(sc,
	UT_WRITE_CLASS_INTERFACE(0x00 | 0x20 | 0x01),
	UAUDIO_V1_REQ_SET_CUR0x01,
	m->req_sel,
	m->chan < 0 ? 0 : m->chan,
	sc->ctl_ifnum,
	u->id,
	req_buf,
	1))
	return EIO5;
break;
case UAUDIO_MIX_NUM1:
nch = uaudio_mixer_nchan(m, NULL((void *)0));
ctl->un.value.num_channels = nch;
for (i = 0; i < nch; i++) {
	val = uaudio_ranges_encode(&m->ranges,
	    ctl->un.value.level[i]);
	DPRINTF("%s: ch %d, ctl %d, num val %d\n", __func__,do {} while(0)
	    i, ctl->un.value.level[i], val)do {} while(0);
	req_buf[0] = val;
	req_buf[1] = val >> 8;
	if (!uaudio_req(sc,
		UT_WRITE_CLASS_INTERFACE(0x00 | 0x20 | 0x01),
		UAUDIO_V1_REQ_SET_CUR0x01,
		m->req_sel,
		m->chan < 0 ? 0 : i + 1,
		sc->ctl_ifnum,
		u->id,
		req_buf,
		2))
		return EIO5;
	m = m->next;
}
break;
case UAUDIO_MIX_ENUM2:
/* XXX: not used yet */
break;
}
return 0;
4315}

4317int
4318uaudio_query_devinfo_do(struct uaudio_softc *sc, struct mixer_devinfo *devinfo)
4319{
struct uaudio_unit *u;
struct uaudio_mixent *m;

devinfo->next = -1;
devinfo->prev = -1;
switch (devinfo->index) {
case UAUDIO_CLASS_IN1:
strlcpy(devinfo->label.name, AudioCinputs"inputs", MAX_AUDIO_DEV_LEN16);
devinfo->type = AUDIO_MIXER_CLASS0;
devinfo->mixer_class = -1;
return 0;
case UAUDIO_CLASS_OUT0:
strlcpy(devinfo->label.name, AudioCoutputs"outputs", MAX_AUDIO_DEV_LEN16);
devinfo->type = AUDIO_MIXER_CLASS0;
devinfo->mixer_class = -1;
return 0;
}

/*
* find the unit & mixent structure for the given index
*/
if (!uaudio_mixer_byindex(sc, devinfo->index, &u, &m))
return ENOENT2;

if (strcmp(m->fname, "level") == 0) {
/*
 * mixer(4) interface doesn't give a names to level
 * controls
 */
strlcpy(devinfo->label.name, u->name, MAX_AUDIO_DEV_LEN16);
} else {
if (m->chan == -1) {
	snprintf(devinfo->label.name, MAX_AUDIO_DEV_LEN16,
	    "%s_%s", u->name, m->fname);
} else {
	snprintf(devinfo->label.name, MAX_AUDIO_DEV_LEN16,
	    "%s_%s%u", u->name, m->fname, m->chan);
}
}

devinfo->mixer_class = u->mixer_class;
switch (m->type) {
case UAUDIO_MIX_SW0:
devinfo->type = AUDIO_MIXER_ENUM1;
devinfo->un.e.num_mem = 2;
devinfo->un.e.member[0].ord = 0;
strlcpy(devinfo->un.e.member[0].label.name, "off",
    MAX_AUDIO_DEV_LEN16);
devinfo->un.e.member[1].ord = 1;
strlcpy(devinfo->un.e.member[1].label.name, "on",
    MAX_AUDIO_DEV_LEN16);
break;
case UAUDIO_MIX_NUM1:
devinfo->type = AUDIO_MIXER_VALUE3;
devinfo->un.v.num_channels = uaudio_mixer_nchan(m, NULL((void *)0));
devinfo->un.v.delta = 1;
break;
case UAUDIO_MIX_ENUM2:
/* XXX: not used yet */
devinfo->type = AUDIO_MIXER_ENUM1;
devinfo->un.e.num_mem = 0;
break;
}
return 0;
4384}

4386int
4387uaudio_get_port(void *arg, struct mixer_ctrl *ctl)
4388{
struct uaudio_softc *sc = arg;
int rc;

usbd_ref_incr(sc->udev);
rc = uaudio_get_port_do(sc, ctl);
usbd_ref_decr(sc->udev);
return rc;
4396}

4398int
4399uaudio_set_port(void *arg, struct mixer_ctrl *ctl)
4400{
struct uaudio_softc *sc = arg;
int rc;

usbd_ref_incr(sc->udev);
rc = uaudio_set_port_do(sc, ctl);
usbd_ref_decr(sc->udev);
return rc;
4408}

4410int
4411uaudio_query_devinfo(void *arg, struct mixer_devinfo *devinfo)
4412{
struct uaudio_softc *sc = arg;
int rc;

usbd_ref_incr(sc->udev);
rc = uaudio_query_devinfo_do(sc, devinfo);
usbd_ref_decr(sc->udev);
return rc;
4420}