Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 */
 
#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/ratelimit.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/slab.h>
 
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
 
#include "usbaudio.h"
#include "helper.h"
#include "card.h"
#include "endpoint.h"
#include "pcm.h"
#include "quirks.h"
 
#define EP_FLAG_RUNNING		1
#define EP_FLAG_STOPPING	2
 
/*
 * snd_usb_endpoint is a model that abstracts everything related to an
 * USB endpoint and its streaming.
 *
 * There are functions to activate and deactivate the streaming URBs and
 * optional callbacks to let the pcm logic handle the actual content of the
 * packets for playback and record. Thus, the bus streaming and the audio
 * handlers are fully decoupled.
 *
 * There are two different types of endpoints in audio applications.
 *
 * SND_USB_ENDPOINT_TYPE_DATA handles full audio data payload for both
 * inbound and outbound traffic.
 *
 * SND_USB_ENDPOINT_TYPE_SYNC endpoints are for inbound traffic only and
 * expect the payload to carry Q10.14 / Q16.16 formatted sync information
 * (3 or 4 bytes).
 *
 * Each endpoint has to be configured prior to being used by calling
 * snd_usb_endpoint_set_params().
 *
 * The model incorporates a reference counting, so that multiple users
 * can call snd_usb_endpoint_start() and snd_usb_endpoint_stop(), and
 * only the first user will effectively start the URBs, and only the last
 * one to stop it will tear the URBs down again.
 */
 
/*
 * convert a sampling rate into our full speed format (fs/1000 in Q16.16)
 * this will overflow at approx 524 kHz
 */
static inline unsigned get_usb_full_speed_rate(unsigned int rate)
{
<------>return ((rate << 13) + 62) / 125;
}
 
/*
 * convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
 * this will overflow at approx 4 MHz
 */
static inline unsigned get_usb_high_speed_rate(unsigned int rate)
{
<------>return ((rate << 10) + 62) / 125;
}
 
/*
 * release a urb data
 */
static void release_urb_ctx(struct snd_urb_ctx *u)
{
<------>if (u->buffer_size)
<------><------>usb_free_coherent(u->ep->chip->dev, u->buffer_size,
<------><------><------><------>  u->urb->transfer_buffer,
<------><------><------><------>  u->urb->transfer_dma);
<------>usb_free_urb(u->urb);
<------>u->urb = NULL;
}
 
static const char *usb_error_string(int err)
{
<------>switch (err) {
<------>case -ENODEV:
<------><------>return "no device";
<------>case -ENOENT:
<------><------>return "endpoint not enabled";
<------>case -EPIPE:
<------><------>return "endpoint stalled";
<------>case -ENOSPC:
<------><------>return "not enough bandwidth";
<------>case -ESHUTDOWN:
<------><------>return "device disabled";
<------>case -EHOSTUNREACH:
<------><------>return "device suspended";
<------>case -EINVAL:
<------>case -EAGAIN:
<------>case -EFBIG:
<------>case -EMSGSIZE:
<------><------>return "internal error";
<------>default:
<------><------>return "unknown error";
<------>}
}
 
/**
 * snd_usb_endpoint_implicit_feedback_sink: Report endpoint usage type
 *
 * @ep: The snd_usb_endpoint
 *
 * Determine whether an endpoint is driven by an implicit feedback
 * data endpoint source.
 */
int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep)
{
<------>return  ep->sync_master &&
<------><------>ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA &&
<------><------>ep->type == SND_USB_ENDPOINT_TYPE_DATA &&
<------><------>usb_pipeout(ep->pipe);
}
 
/*
 * For streaming based on information derived from sync endpoints,
 * prepare_outbound_urb_sizes() will call slave_next_packet_size() to
 * determine the number of samples to be sent in the next packet.
 *
 * For implicit feedback, slave_next_packet_size() is unused.
 */
int snd_usb_endpoint_slave_next_packet_size(struct snd_usb_endpoint *ep)
{
<------>unsigned long flags;
<------>int ret;
 
<------>if (ep->fill_max)
<------><------>return ep->maxframesize;
 
<------>spin_lock_irqsave(&ep->lock, flags);
<------>ep->phase = (ep->phase & 0xffff)
<------><------>+ (ep->freqm << ep->datainterval);
<------>ret = min(ep->phase >> 16, ep->maxframesize);
<------>spin_unlock_irqrestore(&ep->lock, flags);
 
<------>return ret;
}
 
/*
 * For adaptive and synchronous endpoints, prepare_outbound_urb_sizes()
 * will call next_packet_size() to determine the number of samples to be
 * sent in the next packet.
 */
int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep)
{
<------>int ret;
 
<------>if (ep->fill_max)
<------><------>return ep->maxframesize;
 
<------>ep->sample_accum += ep->sample_rem;
<------>if (ep->sample_accum >= ep->pps) {
<------><------>ep->sample_accum -= ep->pps;
<------><------>ret = ep->packsize[1];
<------>} else {
<------><------>ret = ep->packsize[0];
<------>}
 
<------>return ret;
}
 
static void retire_outbound_urb(struct snd_usb_endpoint *ep,
<------><------><------><------>struct snd_urb_ctx *urb_ctx)
{
<------>if (ep->retire_data_urb)
<------><------>ep->retire_data_urb(ep->data_subs, urb_ctx->urb);
}
 
static void retire_inbound_urb(struct snd_usb_endpoint *ep,
<------><------><------>       struct snd_urb_ctx *urb_ctx)
{
<------>struct urb *urb = urb_ctx->urb;
 
<------>if (unlikely(ep->skip_packets > 0)) {
<------><------>ep->skip_packets--;
<------><------>return;
<------>}
 
<------>if (ep->sync_slave)
<------><------>snd_usb_handle_sync_urb(ep->sync_slave, ep, urb);
 
<------>if (ep->retire_data_urb)
<------><------>ep->retire_data_urb(ep->data_subs, urb);
}
 
static void prepare_silent_urb(struct snd_usb_endpoint *ep,
<------><------><------>       struct snd_urb_ctx *ctx)
{
<------>struct urb *urb = ctx->urb;
<------>unsigned int offs = 0;
<------>unsigned int extra = 0;
<------>__le32 packet_length;
<------>int i;
 
<------>/* For tx_length_quirk, put packet length at start of packet */
<------>if (ep->chip->tx_length_quirk)
<------><------>extra = sizeof(packet_length);
 
<------>for (i = 0; i < ctx->packets; ++i) {
<------><------>unsigned int offset;
<------><------>unsigned int length;
<------><------>int counts;
 
<------><------>if (ctx->packet_size[i])
<------><------><------>counts = ctx->packet_size[i];
<------><------>else if (ep->sync_master)
<------><------><------>counts = snd_usb_endpoint_slave_next_packet_size(ep);
<------><------>else
<------><------><------>counts = snd_usb_endpoint_next_packet_size(ep);
 
<------><------>length = counts * ep->stride; /* number of silent bytes */
<------><------>offset = offs * ep->stride + extra * i;
<------><------>urb->iso_frame_desc[i].offset = offset;
<------><------>urb->iso_frame_desc[i].length = length + extra;
<------><------>if (extra) {
<------><------><------>packet_length = cpu_to_le32(length);
<------><------><------>memcpy(urb->transfer_buffer + offset,
<------><------><------>       &packet_length, sizeof(packet_length));
<------><------>}
<------><------>memset(urb->transfer_buffer + offset + extra,
<------><------>       ep->silence_value, length);
<------><------>offs += counts;
<------>}
 
<------>urb->number_of_packets = ctx->packets;
<------>urb->transfer_buffer_length = offs * ep->stride + ctx->packets * extra;
}
 
/*
 * Prepare a PLAYBACK urb for submission to the bus.
 */
static void prepare_outbound_urb(struct snd_usb_endpoint *ep,
<------><------><------><------> struct snd_urb_ctx *ctx)
{
<------>struct urb *urb = ctx->urb;
<------>unsigned char *cp = urb->transfer_buffer;
 
<------>urb->dev = ep->chip->dev; /* we need to set this at each time */
 
<------>switch (ep->type) {
<------>case SND_USB_ENDPOINT_TYPE_DATA:
<------><------>if (ep->prepare_data_urb) {
<------><------><------>ep->prepare_data_urb(ep->data_subs, urb);
<------><------>} else {
<------><------><------>/* no data provider, so send silence */
<------><------><------>prepare_silent_urb(ep, ctx);
<------><------>}
<------><------>break;
 
<------>case SND_USB_ENDPOINT_TYPE_SYNC:
<------><------>if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) {
<------><------><------>/*
<------><------><------> * fill the length and offset of each urb descriptor.
<------><------><------> * the fixed 12.13 frequency is passed as 16.16 through the pipe.
<------><------><------> */
<------><------><------>urb->iso_frame_desc[0].length = 4;
<------><------><------>urb->iso_frame_desc[0].offset = 0;
<------><------><------>cp[0] = ep->freqn;
<------><------><------>cp[1] = ep->freqn >> 8;
<------><------><------>cp[2] = ep->freqn >> 16;
<------><------><------>cp[3] = ep->freqn >> 24;
<------><------>} else {
<------><------><------>/*
<------><------><------> * fill the length and offset of each urb descriptor.
<------><------><------> * the fixed 10.14 frequency is passed through the pipe.
<------><------><------> */
<------><------><------>urb->iso_frame_desc[0].length = 3;
<------><------><------>urb->iso_frame_desc[0].offset = 0;
<------><------><------>cp[0] = ep->freqn >> 2;
<------><------><------>cp[1] = ep->freqn >> 10;
<------><------><------>cp[2] = ep->freqn >> 18;
<------><------>}
 
<------><------>break;
<------>}
}
 
/*
 * Prepare a CAPTURE or SYNC urb for submission to the bus.
 */
static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep,
<------><------><------><------>       struct snd_urb_ctx *urb_ctx)
{
<------>int i, offs;
<------>struct urb *urb = urb_ctx->urb;
 
<------>urb->dev = ep->chip->dev; /* we need to set this at each time */
 
<------>switch (ep->type) {
<------>case SND_USB_ENDPOINT_TYPE_DATA:
<------><------>offs = 0;
<------><------>for (i = 0; i < urb_ctx->packets; i++) {
<------><------><------>urb->iso_frame_desc[i].offset = offs;
<------><------><------>urb->iso_frame_desc[i].length = ep->curpacksize;
<------><------><------>offs += ep->curpacksize;
<------><------>}
 
<------><------>urb->transfer_buffer_length = offs;
<------><------>urb->number_of_packets = urb_ctx->packets;
<------><------>break;
 
<------>case SND_USB_ENDPOINT_TYPE_SYNC:
<------><------>urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize);
<------><------>urb->iso_frame_desc[0].offset = 0;
<------><------>break;
<------>}
}
 
/*
 * Send output urbs that have been prepared previously. URBs are dequeued
 * from ep->ready_playback_urbs and in case there aren't any available
 * or there are no packets that have been prepared, this function does
 * nothing.
 *
 * The reason why the functionality of sending and preparing URBs is separated
 * is that host controllers don't guarantee the order in which they return
 * inbound and outbound packets to their submitters.
 *
 * This function is only used for implicit feedback endpoints. For endpoints
 * driven by dedicated sync endpoints, URBs are immediately re-submitted
 * from their completion handler.
 */
static void queue_pending_output_urbs(struct snd_usb_endpoint *ep)
{
<------>while (test_bit(EP_FLAG_RUNNING, &ep->flags)) {
 
<------><------>unsigned long flags;
<------><------>struct snd_usb_packet_info *packet;
<------><------>struct snd_urb_ctx *ctx = NULL;
<------><------>int err, i;
 
<------><------>spin_lock_irqsave(&ep->lock, flags);
<------><------>if (ep->next_packet_read_pos != ep->next_packet_write_pos) {
<------><------><------>packet = ep->next_packet + ep->next_packet_read_pos;
<------><------><------>ep->next_packet_read_pos++;
<------><------><------>ep->next_packet_read_pos %= MAX_URBS;
 
<------><------><------>/* take URB out of FIFO */
<------><------><------>if (!list_empty(&ep->ready_playback_urbs)) {
<------><------><------><------>ctx = list_first_entry(&ep->ready_playback_urbs,
<------><------><------><------><------>       struct snd_urb_ctx, ready_list);
<------><------><------><------>list_del_init(&ctx->ready_list);
<------><------><------>}
<------><------>}
<------><------>spin_unlock_irqrestore(&ep->lock, flags);
 
<------><------>if (ctx == NULL)
<------><------><------>return;
 
<------><------>/* copy over the length information */
<------><------>for (i = 0; i < packet->packets; i++)
<------><------><------>ctx->packet_size[i] = packet->packet_size[i];
 
<------><------>/* call the data handler to fill in playback data */
<------><------>prepare_outbound_urb(ep, ctx);
 
<------><------>err = usb_submit_urb(ctx->urb, GFP_ATOMIC);
<------><------>if (err < 0)
<------><------><------>usb_audio_err(ep->chip,
<------><------><------><------>"Unable to submit urb #%d: %d (urb %p)\n",
<------><------><------><------>ctx->index, err, ctx->urb);
<------><------>else
<------><------><------>set_bit(ctx->index, &ep->active_mask);
<------>}
}
 
/*
 * complete callback for urbs
 */
static void snd_complete_urb(struct urb *urb)
{
<------>struct snd_urb_ctx *ctx = urb->context;
<------>struct snd_usb_endpoint *ep = ctx->ep;
<------>struct snd_pcm_substream *substream;
<------>unsigned long flags;
<------>int err;
 
<------>if (unlikely(urb->status == -ENOENT ||		/* unlinked */
<------><------>     urb->status == -ENODEV ||		/* device removed */
<------><------>     urb->status == -ECONNRESET ||	/* unlinked */
<------><------>     urb->status == -ESHUTDOWN))	/* device disabled */
<------><------>goto exit_clear;
<------>/* device disconnected */
<------>if (unlikely(atomic_read(&ep->chip->shutdown)))
<------><------>goto exit_clear;
 
<------>if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))
<------><------>goto exit_clear;
 
<------>if (usb_pipeout(ep->pipe)) {
<------><------>retire_outbound_urb(ep, ctx);
<------><------>/* can be stopped during retire callback */
<------><------>if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))
<------><------><------>goto exit_clear;
 
<------><------>if (snd_usb_endpoint_implicit_feedback_sink(ep)) {
<------><------><------>spin_lock_irqsave(&ep->lock, flags);
<------><------><------>list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);
<------><------><------>spin_unlock_irqrestore(&ep->lock, flags);
<------><------><------>queue_pending_output_urbs(ep);
 
<------><------><------>goto exit_clear;
<------><------>}
 
<------><------>prepare_outbound_urb(ep, ctx);
<------><------>/* can be stopped during prepare callback */
<------><------>if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))
<------><------><------>goto exit_clear;
<------>} else {
<------><------>retire_inbound_urb(ep, ctx);
<------><------>/* can be stopped during retire callback */
<------><------>if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))
<------><------><------>goto exit_clear;
 
<------><------>prepare_inbound_urb(ep, ctx);
<------>}
 
<------>err = usb_submit_urb(urb, GFP_ATOMIC);
<------>if (err == 0)
<------><------>return;
 
<------>usb_audio_err(ep->chip, "cannot submit urb (err = %d)\n", err);
<------>if (ep->data_subs && ep->data_subs->pcm_substream) {
<------><------>substream = ep->data_subs->pcm_substream;
<------><------>snd_pcm_stop_xrun(substream);
<------>}
 
exit_clear:
<------>clear_bit(ctx->index, &ep->active_mask);
}
 
/**
 * snd_usb_add_endpoint: Add an endpoint to an USB audio chip
 *
 * @chip: The chip
 * @alts: The USB host interface
 * @ep_num: The number of the endpoint to use
 * @direction: SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE
 * @type: SND_USB_ENDPOINT_TYPE_DATA or SND_USB_ENDPOINT_TYPE_SYNC
 *
 * If the requested endpoint has not been added to the given chip before,
 * a new instance is created. Otherwise, a pointer to the previoulsy
 * created instance is returned. In case of any error, NULL is returned.
 *
 * New endpoints will be added to chip->ep_list and must be freed by
 * calling snd_usb_endpoint_free().
 *
 * For SND_USB_ENDPOINT_TYPE_SYNC, the caller needs to guarantee that
 * bNumEndpoints > 1 beforehand.
 */
struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
<------><------><------><------><------>      struct usb_host_interface *alts,
<------><------><------><------><------>      int ep_num, int direction, int type)
{
<------>struct snd_usb_endpoint *ep;
<------>int is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK;
 
<------>if (WARN_ON(!alts))
<------><------>return NULL;
 
<------>mutex_lock(&chip->mutex);
 
<------>list_for_each_entry(ep, &chip->ep_list, list) {
<------><------>if (ep->ep_num == ep_num &&
<------><------>    ep->iface == alts->desc.bInterfaceNumber &&
<------><------>    ep->altsetting == alts->desc.bAlternateSetting) {
<------><------><------>usb_audio_dbg(ep->chip,
<------><------><------><------>      "Re-using EP %x in iface %d,%d @%p\n",
<------><------><------><------><------>ep_num, ep->iface, ep->altsetting, ep);
<------><------><------>goto __exit_unlock;
<------><------>}
<------>}
 
<------>usb_audio_dbg(chip, "Creating new %s %s endpoint #%x\n",
<------><------>    is_playback ? "playback" : "capture",
<------><------>    type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync",
<------><------>    ep_num);
 
<------>ep = kzalloc(sizeof(*ep), GFP_KERNEL);
<------>if (!ep)
<------><------>goto __exit_unlock;
 
<------>ep->chip = chip;
<------>spin_lock_init(&ep->lock);
<------>ep->type = type;
<------>ep->ep_num = ep_num;
<------>ep->iface = alts->desc.bInterfaceNumber;
<------>ep->altsetting = alts->desc.bAlternateSetting;
<------>INIT_LIST_HEAD(&ep->ready_playback_urbs);
<------>ep_num &= USB_ENDPOINT_NUMBER_MASK;
 
<------>if (is_playback)
<------><------>ep->pipe = usb_sndisocpipe(chip->dev, ep_num);
<------>else
<------><------>ep->pipe = usb_rcvisocpipe(chip->dev, ep_num);
 
<------>if (type == SND_USB_ENDPOINT_TYPE_SYNC) {
<------><------>if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
<------><------>    get_endpoint(alts, 1)->bRefresh >= 1 &&
<------><------>    get_endpoint(alts, 1)->bRefresh <= 9)
<------><------><------>ep->syncinterval = get_endpoint(alts, 1)->bRefresh;
<------><------>else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL)
<------><------><------>ep->syncinterval = 1;
<------><------>else if (get_endpoint(alts, 1)->bInterval >= 1 &&
<------><------><------> get_endpoint(alts, 1)->bInterval <= 16)
<------><------><------>ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
<------><------>else
<------><------><------>ep->syncinterval = 3;
 
<------><------>ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
<------>}
 
<------>list_add_tail(&ep->list, &chip->ep_list);
 
<------>ep->is_implicit_feedback = 0;
 
__exit_unlock:
<------>mutex_unlock(&chip->mutex);
 
<------>return ep;
}
 
/*
 *  wait until all urbs are processed.
 */
static int wait_clear_urbs(struct snd_usb_endpoint *ep)
{
<------>unsigned long end_time = jiffies + msecs_to_jiffies(1000);
<------>int alive;
 
<------>do {
<------><------>alive = bitmap_weight(&ep->active_mask, ep->nurbs);
<------><------>if (!alive)
<------><------><------>break;
 
<------><------>schedule_timeout_uninterruptible(1);
<------>} while (time_before(jiffies, end_time));
 
<------>if (alive)
<------><------>usb_audio_err(ep->chip,
<------><------><------>"timeout: still %d active urbs on EP #%x\n",
<------><------><------>alive, ep->ep_num);
<------>clear_bit(EP_FLAG_STOPPING, &ep->flags);
 
<------>ep->data_subs = NULL;
<------>ep->sync_slave = NULL;
<------>ep->retire_data_urb = NULL;
<------>ep->prepare_data_urb = NULL;
 
<------>return 0;
}
 
/* sync the pending stop operation;
 * this function itself doesn't trigger the stop operation
 */
void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep)
{
<------>if (ep && test_bit(EP_FLAG_STOPPING, &ep->flags))
<------><------>wait_clear_urbs(ep);
}
 
/*
 * unlink active urbs.
 */
static int deactivate_urbs(struct snd_usb_endpoint *ep, bool force)
{
<------>unsigned int i;
 
<------>clear_bit(EP_FLAG_RUNNING, &ep->flags);
 
<------>INIT_LIST_HEAD(&ep->ready_playback_urbs);
<------>ep->next_packet_read_pos = 0;
<------>ep->next_packet_write_pos = 0;
 
<------>for (i = 0; i < ep->nurbs; i++) {
<------><------>if (test_bit(i, &ep->active_mask)) {
<------><------><------>if (!test_and_set_bit(i, &ep->unlink_mask)) {
<------><------><------><------>struct urb *u = ep->urb[i].urb;
<------><------><------><------>usb_unlink_urb(u);
<------><------><------>}
<------><------>}
<------>}
 
<------>return 0;
}
 
/*
 * release an endpoint's urbs
 */
static void release_urbs(struct snd_usb_endpoint *ep, int force)
{
<------>int i;
 
<------>/* route incoming urbs to nirvana */
<------>ep->retire_data_urb = NULL;
<------>ep->prepare_data_urb = NULL;
 
<------>/* stop urbs */
<------>deactivate_urbs(ep, force);
<------>wait_clear_urbs(ep);
 
<------>for (i = 0; i < ep->nurbs; i++)
<------><------>release_urb_ctx(&ep->urb[i]);
 
<------>usb_free_coherent(ep->chip->dev, SYNC_URBS * 4,
<------><------><------>  ep->syncbuf, ep->sync_dma);
 
<------>ep->syncbuf = NULL;
<------>ep->nurbs = 0;
}
 
/*
 * Check data endpoint for format differences
 */
static bool check_ep_params(struct snd_usb_endpoint *ep,
<------><------><------>      snd_pcm_format_t pcm_format,
<------><------><------>      unsigned int channels,
<------><------><------>      unsigned int period_bytes,
<------><------><------>      unsigned int frames_per_period,
<------><------><------>      unsigned int periods_per_buffer,
<------><------><------>      struct audioformat *fmt,
<------><------><------>      struct snd_usb_endpoint *sync_ep)
{
<------>unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb;
<------>unsigned int max_packs_per_period, urbs_per_period, urb_packs;
<------>unsigned int max_urbs;
<------>int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
<------>int tx_length_quirk = (ep->chip->tx_length_quirk &&
<------><------><------>       usb_pipeout(ep->pipe));
<------>bool ret = 1;
 
<------>if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
<------><------>/*
<------><------> * When operating in DSD DOP mode, the size of a sample frame
<------><------> * in hardware differs from the actual physical format width
<------><------> * because we need to make room for the DOP markers.
<------><------> */
<------><------>frame_bits += channels << 3;
<------>}
 
<------>ret = ret && (ep->datainterval == fmt->datainterval);
<------>ret = ret && (ep->stride == frame_bits >> 3);
 
<------>switch (pcm_format) {
<------>case SNDRV_PCM_FORMAT_U8:
<------><------>ret = ret && (ep->silence_value == 0x80);
<------><------>break;
<------>case SNDRV_PCM_FORMAT_DSD_U8:
<------>case SNDRV_PCM_FORMAT_DSD_U16_LE:
<------>case SNDRV_PCM_FORMAT_DSD_U32_LE:
<------>case SNDRV_PCM_FORMAT_DSD_U16_BE:
<------>case SNDRV_PCM_FORMAT_DSD_U32_BE:
<------><------>ret = ret && (ep->silence_value == 0x69);
<------><------>break;
<------>default:
<------><------>ret = ret && (ep->silence_value == 0);
<------>}
 
<------>/* assume max. frequency is 50% higher than nominal */
<------>ret = ret && (ep->freqmax == ep->freqn + (ep->freqn >> 1));
<------>/* Round up freqmax to nearest integer in order to calculate maximum
<------> * packet size, which must represent a whole number of frames.
<------> * This is accomplished by adding 0x0.ffff before converting the
<------> * Q16.16 format into integer.
<------> * In order to accurately calculate the maximum packet size when
<------> * the data interval is more than 1 (i.e. ep->datainterval > 0),
<------> * multiply by the data interval prior to rounding. For instance,
<------> * a freqmax of 41 kHz will result in a max packet size of 6 (5.125)
<------> * frames with a data interval of 1, but 11 (10.25) frames with a
<------> * data interval of 2.
<------> * (ep->freqmax << ep->datainterval overflows at 8.192 MHz for the
<------> * maximum datainterval value of 3, at USB full speed, higher for
<------> * USB high speed, noting that ep->freqmax is in units of
<------> * frames per packet in Q16.16 format.)
<------> */
<------>maxsize = (((ep->freqmax << ep->datainterval) + 0xffff) >> 16) *
<------><------><------> (frame_bits >> 3);
<------>if (tx_length_quirk)
<------><------>maxsize += sizeof(__le32); /* Space for length descriptor */
<------>/* but wMaxPacketSize might reduce this */
<------>if (ep->maxpacksize && ep->maxpacksize < maxsize) {
<------><------>/* whatever fits into a max. size packet */
<------><------>unsigned int data_maxsize = maxsize = ep->maxpacksize;
 
<------><------>if (tx_length_quirk)
<------><------><------>/* Need to remove the length descriptor to calc freq */
<------><------><------>data_maxsize -= sizeof(__le32);
<------><------>ret = ret && (ep->freqmax == (data_maxsize / (frame_bits >> 3))
<------><------><------><------><< (16 - ep->datainterval));
<------>}
 
<------>if (ep->fill_max)
<------><------>ret = ret && (ep->curpacksize == ep->maxpacksize);
<------>else
<------><------>ret = ret && (ep->curpacksize == maxsize);
 
<------>if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) {
<------><------>packs_per_ms = 8 >> ep->datainterval;
<------><------>max_packs_per_urb = MAX_PACKS_HS;
<------>} else {
<------><------>packs_per_ms = 1;
<------><------>max_packs_per_urb = MAX_PACKS;
<------>}
<------>if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))
<------><------>max_packs_per_urb = min(max_packs_per_urb,
<------><------><------><------><------>1U << sync_ep->syncinterval);
<------>max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval);
 
<------>/*
<------> * Capture endpoints need to use small URBs because there's no way
<------> * to tell in advance where the next period will end, and we don't
<------> * want the next URB to complete much after the period ends.
<------> *
<------> * Playback endpoints with implicit sync much use the same parameters
<------> * as their corresponding capture endpoint.
<------> */
<------>if (usb_pipein(ep->pipe) ||
<------><------><------>snd_usb_endpoint_implicit_feedback_sink(ep)) {
 
<------><------>urb_packs = packs_per_ms;
<------><------>/*
<------><------> * Wireless devices can poll at a max rate of once per 4ms.
<------><------> * For dataintervals less than 5, increase the packet count to
<------><------> * allow the host controller to use bursting to fill in the
<------><------> * gaps.
<------><------> */
<------><------>if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) {
<------><------><------>int interval = ep->datainterval;
 
<------><------><------>while (interval < 5) {
<------><------><------><------>urb_packs <<= 1;
<------><------><------><------>++interval;
<------><------><------>}
<------><------>}
<------><------>/* make capture URBs <= 1 ms and smaller than a period */
<------><------>urb_packs = min(max_packs_per_urb, urb_packs);
<------><------>while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
<------><------><------>urb_packs >>= 1;
<------><------>ret = ret && (ep->nurbs == MAX_URBS);
 
<------>/*
<------> * Playback endpoints without implicit sync are adjusted so that
<------> * a period fits as evenly as possible in the smallest number of
<------> * URBs.  The total number of URBs is adjusted to the size of the
<------> * ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits.
<------> */
<------>} else {
<------><------>/* determine how small a packet can be */
<------><------>minsize = (ep->freqn >> (16 - ep->datainterval)) *
<------><------><------><------>(frame_bits >> 3);
<------><------>/* with sync from device, assume it can be 12% lower */
<------><------>if (sync_ep)
<------><------><------>minsize -= minsize >> 3;
<------><------>minsize = max(minsize, 1u);
 
<------><------>/* how many packets will contain an entire ALSA period? */
<------><------>max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize);
 
<------><------>/* how many URBs will contain a period? */
<------><------>urbs_per_period = DIV_ROUND_UP(max_packs_per_period,
<------><------><------><------>max_packs_per_urb);
<------><------>/* how many packets are needed in each URB? */
<------><------>urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period);
 
<------><------>/* limit the number of frames in a single URB */
<------><------>ret = ret && (ep->max_urb_frames ==
<------><------><------>DIV_ROUND_UP(frames_per_period, urbs_per_period));
 
<------><------>/* try to use enough URBs to contain an entire ALSA buffer */
<------><------>max_urbs = min((unsigned) MAX_URBS,
<------><------><------><------>MAX_QUEUE * packs_per_ms / urb_packs);
<------><------>ret = ret && (ep->nurbs == min(max_urbs,
<------><------><------><------>urbs_per_period * periods_per_buffer));
<------>}
 
<------>ret = ret && (ep->datainterval == fmt->datainterval);
<------>ret = ret && (ep->maxpacksize == fmt->maxpacksize);
<------>ret = ret &&
<------><------>(ep->fill_max == !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX));
 
<------>return ret;
}
 
/*
 * configure a data endpoint
 */
static int data_ep_set_params(struct snd_usb_endpoint *ep,
<------><------><------>      snd_pcm_format_t pcm_format,
<------><------><------>      unsigned int channels,
<------><------><------>      unsigned int period_bytes,
<------><------><------>      unsigned int frames_per_period,
<------><------><------>      unsigned int periods_per_buffer,
<------><------><------>      struct audioformat *fmt,
<------><------><------>      struct snd_usb_endpoint *sync_ep)
{
<------>unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb;
<------>unsigned int max_packs_per_period, urbs_per_period, urb_packs;
<------>unsigned int max_urbs, i;
<------>int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
<------>int tx_length_quirk = (ep->chip->tx_length_quirk &&
<------><------><------>       usb_pipeout(ep->pipe));
 
<------>if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
<------><------>/*
<------><------> * When operating in DSD DOP mode, the size of a sample frame
<------><------> * in hardware differs from the actual physical format width
<------><------> * because we need to make room for the DOP markers.
<------><------> */
<------><------>frame_bits += channels << 3;
<------>}
 
<------>ep->datainterval = fmt->datainterval;
<------>ep->stride = frame_bits >> 3;
 
<------>switch (pcm_format) {
<------>case SNDRV_PCM_FORMAT_U8:
<------><------>ep->silence_value = 0x80;
<------><------>break;
<------>case SNDRV_PCM_FORMAT_DSD_U8:
<------>case SNDRV_PCM_FORMAT_DSD_U16_LE:
<------>case SNDRV_PCM_FORMAT_DSD_U32_LE:
<------>case SNDRV_PCM_FORMAT_DSD_U16_BE:
<------>case SNDRV_PCM_FORMAT_DSD_U32_BE:
<------><------>ep->silence_value = 0x69;
<------><------>break;
<------>default:
<------><------>ep->silence_value = 0;
<------>}
 
<------>/* assume max. frequency is 50% higher than nominal */
<------>ep->freqmax = ep->freqn + (ep->freqn >> 1);
<------>/* Round up freqmax to nearest integer in order to calculate maximum
<------> * packet size, which must represent a whole number of frames.
<------> * This is accomplished by adding 0x0.ffff before converting the
<------> * Q16.16 format into integer.
<------> * In order to accurately calculate the maximum packet size when
<------> * the data interval is more than 1 (i.e. ep->datainterval > 0),
<------> * multiply by the data interval prior to rounding. For instance,
<------> * a freqmax of 41 kHz will result in a max packet size of 6 (5.125)
<------> * frames with a data interval of 1, but 11 (10.25) frames with a
<------> * data interval of 2.
<------> * (ep->freqmax << ep->datainterval overflows at 8.192 MHz for the
<------> * maximum datainterval value of 3, at USB full speed, higher for
<------> * USB high speed, noting that ep->freqmax is in units of
<------> * frames per packet in Q16.16 format.)
<------> */
<------>maxsize = (((ep->freqmax << ep->datainterval) + 0xffff) >> 16) *
<------><------><------> (frame_bits >> 3);
<------>if (tx_length_quirk)
<------><------>maxsize += sizeof(__le32); /* Space for length descriptor */
<------>/* but wMaxPacketSize might reduce this */
<------>if (ep->maxpacksize && ep->maxpacksize < maxsize) {
<------><------>/* whatever fits into a max. size packet */
<------><------>unsigned int data_maxsize = maxsize = ep->maxpacksize;
 
<------><------>if (tx_length_quirk)
<------><------><------>/* Need to remove the length descriptor to calc freq */
<------><------><------>data_maxsize -= sizeof(__le32);
<------><------>ep->freqmax = (data_maxsize / (frame_bits >> 3))
<------><------><------><------><< (16 - ep->datainterval);
<------>}
 
<------>if (ep->fill_max)
<------><------>ep->curpacksize = ep->maxpacksize;
<------>else
<------><------>ep->curpacksize = maxsize;
 
<------>if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) {
<------><------>packs_per_ms = 8 >> ep->datainterval;
<------><------>max_packs_per_urb = MAX_PACKS_HS;
<------>} else {
<------><------>packs_per_ms = 1;
<------><------>max_packs_per_urb = MAX_PACKS;
<------>}
<------>if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))
<------><------>max_packs_per_urb = min(max_packs_per_urb,
<------><------><------><------><------>1U << sync_ep->syncinterval);
<------>max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval);
 
<------>/*
<------> * Capture endpoints need to use small URBs because there's no way
<------> * to tell in advance where the next period will end, and we don't
<------> * want the next URB to complete much after the period ends.
<------> *
<------> * Playback endpoints with implicit sync much use the same parameters
<------> * as their corresponding capture endpoint.
<------> */
<------>if (usb_pipein(ep->pipe) ||
<------><------><------>snd_usb_endpoint_implicit_feedback_sink(ep)) {
 
<------><------>urb_packs = packs_per_ms;
<------><------>/*
<------><------> * Wireless devices can poll at a max rate of once per 4ms.
<------><------> * For dataintervals less than 5, increase the packet count to
<------><------> * allow the host controller to use bursting to fill in the
<------><------> * gaps.
<------><------> */
<------><------>if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) {
<------><------><------>int interval = ep->datainterval;
<------><------><------>while (interval < 5) {
<------><------><------><------>urb_packs <<= 1;
<------><------><------><------>++interval;
<------><------><------>}
<------><------>}
<------><------>/* make capture URBs <= 1 ms and smaller than a period */
<------><------>urb_packs = min(max_packs_per_urb, urb_packs);
<------><------>while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
<------><------><------>urb_packs >>= 1;
<------><------>ep->nurbs = MAX_URBS;
 
<------>/*
<------> * Playback endpoints without implicit sync are adjusted so that
<------> * a period fits as evenly as possible in the smallest number of
<------> * URBs.  The total number of URBs is adjusted to the size of the
<------> * ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits.
<------> */
<------>} else {
<------><------>/* determine how small a packet can be */
<------><------>minsize = (ep->freqn >> (16 - ep->datainterval)) *
<------><------><------><------>(frame_bits >> 3);
<------><------>/* with sync from device, assume it can be 12% lower */
<------><------>if (sync_ep)
<------><------><------>minsize -= minsize >> 3;
<------><------>minsize = max(minsize, 1u);
 
<------><------>/* how many packets will contain an entire ALSA period? */
<------><------>max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize);
 
<------><------>/* how many URBs will contain a period? */
<------><------>urbs_per_period = DIV_ROUND_UP(max_packs_per_period,
<------><------><------><------>max_packs_per_urb);
<------><------>/* how many packets are needed in each URB? */
<------><------>urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period);
 
<------><------>/* limit the number of frames in a single URB */
<------><------>ep->max_urb_frames = DIV_ROUND_UP(frames_per_period,
<------><------><------><------><------>urbs_per_period);
 
<------><------>/* try to use enough URBs to contain an entire ALSA buffer */
<------><------>max_urbs = min((unsigned) MAX_URBS,
<------><------><------><------>MAX_QUEUE * packs_per_ms / urb_packs);
<------><------>ep->nurbs = min(max_urbs, urbs_per_period * periods_per_buffer);
<------>}
 
<------>/* allocate and initialize data urbs */
<------>for (i = 0; i < ep->nurbs; i++) {
<------><------>struct snd_urb_ctx *u = &ep->urb[i];
<------><------>u->index = i;
<------><------>u->ep = ep;
<------><------>u->packets = urb_packs;
<------><------>u->buffer_size = maxsize * u->packets;
 
<------><------>if (fmt->fmt_type == UAC_FORMAT_TYPE_II)
<------><------><------>u->packets++; /* for transfer delimiter */
<------><------>u->urb = usb_alloc_urb(u->packets, GFP_KERNEL);
<------><------>if (!u->urb)
<------><------><------>goto out_of_memory;
 
<------><------>u->urb->transfer_buffer =
<------><------><------>usb_alloc_coherent(ep->chip->dev, u->buffer_size,
<------><------><------><------><------>   GFP_KERNEL, &u->urb->transfer_dma);
<------><------>if (!u->urb->transfer_buffer)
<------><------><------>goto out_of_memory;
<------><------>u->urb->pipe = ep->pipe;
<------><------>u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
<------><------>u->urb->interval = 1 << ep->datainterval;
<------><------>u->urb->context = u;
<------><------>u->urb->complete = snd_complete_urb;
<------><------>INIT_LIST_HEAD(&u->ready_list);
<------>}
 
<------>return 0;
 
out_of_memory:
<------>release_urbs(ep, 0);
<------>return -ENOMEM;
}
 
/*
 * configure a sync endpoint
 */
static int sync_ep_set_params(struct snd_usb_endpoint *ep)
{
<------>int i;
 
<------>ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4,
<------><------><------><------><------> GFP_KERNEL, &ep->sync_dma);
<------>if (!ep->syncbuf)
<------><------>return -ENOMEM;
 
<------>for (i = 0; i < SYNC_URBS; i++) {
<------><------>struct snd_urb_ctx *u = &ep->urb[i];
<------><------>u->index = i;
<------><------>u->ep = ep;
<------><------>u->packets = 1;
<------><------>u->urb = usb_alloc_urb(1, GFP_KERNEL);
<------><------>if (!u->urb)
<------><------><------>goto out_of_memory;
<------><------>u->urb->transfer_buffer = ep->syncbuf + i * 4;
<------><------>u->urb->transfer_dma = ep->sync_dma + i * 4;
<------><------>u->urb->transfer_buffer_length = 4;
<------><------>u->urb->pipe = ep->pipe;
<------><------>u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
<------><------>u->urb->number_of_packets = 1;
<------><------>u->urb->interval = 1 << ep->syncinterval;
<------><------>u->urb->context = u;
<------><------>u->urb->complete = snd_complete_urb;
<------>}
 
<------>ep->nurbs = SYNC_URBS;
 
<------>return 0;
 
out_of_memory:
<------>release_urbs(ep, 0);
<------>return -ENOMEM;
}
 
/**
 * snd_usb_endpoint_set_params: configure an snd_usb_endpoint
 *
 * @ep: the snd_usb_endpoint to configure
 * @pcm_format: the audio fomat.
 * @channels: the number of audio channels.
 * @period_bytes: the number of bytes in one alsa period.
 * @period_frames: the number of frames in one alsa period.
 * @buffer_periods: the number of periods in one alsa buffer.
 * @rate: the frame rate.
 * @fmt: the USB audio format information
 * @sync_ep: the sync endpoint to use, if any
 *
 * Determine the number of URBs to be used on this endpoint.
 * An endpoint must be configured before it can be started.
 * An endpoint that is already running can not be reconfigured.
 */
int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
<------><------><------><------>snd_pcm_format_t pcm_format,
<------><------><------><------>unsigned int channels,
<------><------><------><------>unsigned int period_bytes,
<------><------><------><------>unsigned int period_frames,
<------><------><------><------>unsigned int buffer_periods,
<------><------><------><------>unsigned int rate,
<------><------><------><------>struct audioformat *fmt,
<------><------><------><------>struct snd_usb_endpoint *sync_ep)
{
<------>int err;
 
<------>if (ep->use_count != 0) {
<------><------>bool check = ep->is_implicit_feedback &&
<------><------><------>check_ep_params(ep, pcm_format,
<------><------><------><------><------>     channels, period_bytes,
<------><------><------><------><------>     period_frames, buffer_periods,
<------><------><------><------><------>     fmt, sync_ep);
 
<------><------>if (!check) {
<------><------><------>usb_audio_warn(ep->chip,
<------><------><------><------>"Unable to change format on ep #%x: already in use\n",
<------><------><------><------>ep->ep_num);
<------><------><------>return -EBUSY;
<------><------>}
 
<------><------>usb_audio_dbg(ep->chip,
<------><------><------>      "Ep #%x already in use as implicit feedback but format not changed\n",
<------><------><------>      ep->ep_num);
<------><------>return 0;
<------>}
 
<------>/* release old buffers, if any */
<------>release_urbs(ep, 0);
 
<------>ep->datainterval = fmt->datainterval;
<------>ep->maxpacksize = fmt->maxpacksize;
<------>ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX);
 
<------>if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL) {
<------><------>ep->freqn = get_usb_full_speed_rate(rate);
<------><------>ep->pps = 1000 >> ep->datainterval;
<------>} else {
<------><------>ep->freqn = get_usb_high_speed_rate(rate);
<------><------>ep->pps = 8000 >> ep->datainterval;
<------>}
 
<------>ep->sample_rem = rate % ep->pps;
<------>ep->packsize[0] = rate / ep->pps;
<------>ep->packsize[1] = (rate + (ep->pps - 1)) / ep->pps;
 
<------>/* calculate the frequency in 16.16 format */
<------>ep->freqm = ep->freqn;
<------>ep->freqshift = INT_MIN;
 
<------>ep->phase = 0;
 
<------>switch (ep->type) {
<------>case  SND_USB_ENDPOINT_TYPE_DATA:
<------><------>err = data_ep_set_params(ep, pcm_format, channels,
<------><------><------><------><------> period_bytes, period_frames,
<------><------><------><------><------> buffer_periods, fmt, sync_ep);
<------><------>break;
<------>case  SND_USB_ENDPOINT_TYPE_SYNC:
<------><------>err = sync_ep_set_params(ep);
<------><------>break;
<------>default:
<------><------>err = -EINVAL;
<------>}
 
<------>usb_audio_dbg(ep->chip,
<------><------>"Setting params for ep #%x (type %d, %d urbs), ret=%d\n",
<------><------>ep->ep_num, ep->type, ep->nurbs, err);
 
<------>return err;
}
 
/**
 * snd_usb_endpoint_start: start an snd_usb_endpoint
 *
 * @ep: the endpoint to start
 *
 * A call to this function will increment the use count of the endpoint.
 * In case it is not already running, the URBs for this endpoint will be
 * submitted. Otherwise, this function does nothing.
 *
 * Must be balanced to calls of snd_usb_endpoint_stop().
 *
 * Returns an error if the URB submission failed, 0 in all other cases.
 */
int snd_usb_endpoint_start(struct snd_usb_endpoint *ep)
{
<------>int err;
<------>unsigned int i;
 
<------>if (atomic_read(&ep->chip->shutdown))
<------><------>return -EBADFD;
 
<------>/* already running? */
<------>if (++ep->use_count != 1)
<------><------>return 0;
 
<------>/* just to be sure */
<------>deactivate_urbs(ep, false);
 
<------>ep->active_mask = 0;
<------>ep->unlink_mask = 0;
<------>ep->phase = 0;
<------>ep->sample_accum = 0;
 
<------>snd_usb_endpoint_start_quirk(ep);
 
<------>/*
<------> * If this endpoint has a data endpoint as implicit feedback source,
<------> * don't start the urbs here. Instead, mark them all as available,
<------> * wait for the record urbs to return and queue the playback urbs
<------> * from that context.
<------> */
 
<------>set_bit(EP_FLAG_RUNNING, &ep->flags);
 
<------>if (snd_usb_endpoint_implicit_feedback_sink(ep)) {
<------><------>for (i = 0; i < ep->nurbs; i++) {
<------><------><------>struct snd_urb_ctx *ctx = ep->urb + i;
<------><------><------>list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);
<------><------>}
 
<------><------>return 0;
<------>}
 
<------>for (i = 0; i < ep->nurbs; i++) {
<------><------>struct urb *urb = ep->urb[i].urb;
 
<------><------>if (snd_BUG_ON(!urb))
<------><------><------>goto __error;
 
<------><------>if (usb_pipeout(ep->pipe)) {
<------><------><------>prepare_outbound_urb(ep, urb->context);
<------><------>} else {
<------><------><------>prepare_inbound_urb(ep, urb->context);
<------><------>}
 
<------><------>err = usb_submit_urb(urb, GFP_ATOMIC);
<------><------>if (err < 0) {
<------><------><------>usb_audio_err(ep->chip,
<------><------><------><------>"cannot submit urb %d, error %d: %s\n",
<------><------><------><------>i, err, usb_error_string(err));
<------><------><------>goto __error;
<------><------>}
<------><------>set_bit(i, &ep->active_mask);
<------>}
 
<------>return 0;
 
__error:
<------>clear_bit(EP_FLAG_RUNNING, &ep->flags);
<------>ep->use_count--;
<------>deactivate_urbs(ep, false);
<------>return -EPIPE;
}
 
/**
 * snd_usb_endpoint_stop: stop an snd_usb_endpoint
 *
 * @ep: the endpoint to stop (may be NULL)
 *
 * A call to this function will decrement the use count of the endpoint.
 * In case the last user has requested the endpoint stop, the URBs will
 * actually be deactivated.
 *
 * Must be balanced to calls of snd_usb_endpoint_start().
 *
 * The caller needs to synchronize the pending stop operation via
 * snd_usb_endpoint_sync_pending_stop().
 */
void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep)
{
<------>if (!ep)
<------><------>return;
 
<------>if (snd_BUG_ON(ep->use_count == 0))
<------><------>return;
 
<------>if (--ep->use_count == 0) {
<------><------>deactivate_urbs(ep, false);
<------><------>set_bit(EP_FLAG_STOPPING, &ep->flags);
<------>}
}
 
/**
 * snd_usb_endpoint_deactivate: deactivate an snd_usb_endpoint
 *
 * @ep: the endpoint to deactivate
 *
 * If the endpoint is not currently in use, this functions will
 * deactivate its associated URBs.
 *
 * In case of any active users, this functions does nothing.
 */
void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep)
{
<------>if (!ep)
<------><------>return;
 
<------>if (ep->use_count != 0)
<------><------>return;
 
<------>deactivate_urbs(ep, true);
<------>wait_clear_urbs(ep);
}
 
/**
 * snd_usb_endpoint_release: Tear down an snd_usb_endpoint
 *
 * @ep: the endpoint to release
 *
 * This function does not care for the endpoint's use count but will tear
 * down all the streaming URBs immediately.
 */
void snd_usb_endpoint_release(struct snd_usb_endpoint *ep)
{
<------>release_urbs(ep, 1);
}
 
/**
 * snd_usb_endpoint_free: Free the resources of an snd_usb_endpoint
 *
 * @ep: the endpoint to free
 *
 * This free all resources of the given ep.
 */
void snd_usb_endpoint_free(struct snd_usb_endpoint *ep)
{
<------>kfree(ep);
}
 
/**
 * snd_usb_handle_sync_urb: parse an USB sync packet
 *
 * @ep: the endpoint to handle the packet
 * @sender: the sending endpoint
 * @urb: the received packet
 *
 * This function is called from the context of an endpoint that received
 * the packet and is used to let another endpoint object handle the payload.
 */
void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
<------><------><------>     struct snd_usb_endpoint *sender,
<------><------><------>     const struct urb *urb)
{
<------>int shift;
<------>unsigned int f;
<------>unsigned long flags;
 
<------>snd_BUG_ON(ep == sender);
 
<------>/*
<------> * In case the endpoint is operating in implicit feedback mode, prepare
<------> * a new outbound URB that has the same layout as the received packet
<------> * and add it to the list of pending urbs. queue_pending_output_urbs()
<------> * will take care of them later.
<------> */
<------>if (snd_usb_endpoint_implicit_feedback_sink(ep) &&
<------>    ep->use_count != 0) {
 
<------><------>/* implicit feedback case */
<------><------>int i, bytes = 0;
<------><------>struct snd_urb_ctx *in_ctx;
<------><------>struct snd_usb_packet_info *out_packet;
 
<------><------>in_ctx = urb->context;
 
<------><------>/* Count overall packet size */
<------><------>for (i = 0; i < in_ctx->packets; i++)
<------><------><------>if (urb->iso_frame_desc[i].status == 0)
<------><------><------><------>bytes += urb->iso_frame_desc[i].actual_length;
 
<------><------>/*
<------><------> * skip empty packets. At least M-Audio's Fast Track Ultra stops
<------><------> * streaming once it received a 0-byte OUT URB
<------><------> */
<------><------>if (bytes == 0)
<------><------><------>return;
 
<------><------>spin_lock_irqsave(&ep->lock, flags);
<------><------>out_packet = ep->next_packet + ep->next_packet_write_pos;
 
<------><------>/*
<------><------> * Iterate through the inbound packet and prepare the lengths
<------><------> * for the output packet. The OUT packet we are about to send
<------><------> * will have the same amount of payload bytes per stride as the
<------><------> * IN packet we just received. Since the actual size is scaled
<------><------> * by the stride, use the sender stride to calculate the length
<------><------> * in case the number of channels differ between the implicitly
<------><------> * fed-back endpoint and the synchronizing endpoint.
<------><------> */
 
<------><------>out_packet->packets = in_ctx->packets;
<------><------>for (i = 0; i < in_ctx->packets; i++) {
<------><------><------>if (urb->iso_frame_desc[i].status == 0)
<------><------><------><------>out_packet->packet_size[i] =
<------><------><------><------><------>urb->iso_frame_desc[i].actual_length / sender->stride;
<------><------><------>else
<------><------><------><------>out_packet->packet_size[i] = 0;
<------><------>}
 
<------><------>ep->next_packet_write_pos++;
<------><------>ep->next_packet_write_pos %= MAX_URBS;
<------><------>spin_unlock_irqrestore(&ep->lock, flags);
<------><------>queue_pending_output_urbs(ep);
 
<------><------>return;
<------>}
 
<------>/*
<------> * process after playback sync complete
<------> *
<------> * Full speed devices report feedback values in 10.14 format as samples
<------> * per frame, high speed devices in 16.16 format as samples per
<------> * microframe.
<------> *
<------> * Because the Audio Class 1 spec was written before USB 2.0, many high
<------> * speed devices use a wrong interpretation, some others use an
<------> * entirely different format.
<------> *
<------> * Therefore, we cannot predict what format any particular device uses
<------> * and must detect it automatically.
<------> */
 
<------>if (urb->iso_frame_desc[0].status != 0 ||
<------>    urb->iso_frame_desc[0].actual_length < 3)
<------><------>return;
 
<------>f = le32_to_cpup(urb->transfer_buffer);
<------>if (urb->iso_frame_desc[0].actual_length == 3)
<------><------>f &= 0x00ffffff;
<------>else
<------><------>f &= 0x0fffffff;
 
<------>if (f == 0)
<------><------>return;
 
<------>if (unlikely(sender->tenor_fb_quirk)) {
<------><------>/*
<------><------> * Devices based on Tenor 8802 chipsets (TEAC UD-H01
<------><------> * and others) sometimes change the feedback value
<------><------> * by +/- 0x1.0000.
<------><------> */
<------><------>if (f < ep->freqn - 0x8000)
<------><------><------>f += 0xf000;
<------><------>else if (f > ep->freqn + 0x8000)
<------><------><------>f -= 0xf000;
<------>} else if (unlikely(ep->freqshift == INT_MIN)) {
<------><------>/*
<------><------> * The first time we see a feedback value, determine its format
<------><------> * by shifting it left or right until it matches the nominal
<------><------> * frequency value.  This assumes that the feedback does not
<------><------> * differ from the nominal value more than +50% or -25%.
<------><------> */
<------><------>shift = 0;
<------><------>while (f < ep->freqn - ep->freqn / 4) {
<------><------><------>f <<= 1;
<------><------><------>shift++;
<------><------>}
<------><------>while (f > ep->freqn + ep->freqn / 2) {
<------><------><------>f >>= 1;
<------><------><------>shift--;
<------><------>}
<------><------>ep->freqshift = shift;
<------>} else if (ep->freqshift >= 0)
<------><------>f <<= ep->freqshift;
<------>else
<------><------>f >>= -ep->freqshift;
 
<------>if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) {
<------><------>/*
<------><------> * If the frequency looks valid, set it.
<------><------> * This value is referred to in prepare_playback_urb().
<------><------> */
<------><------>spin_lock_irqsave(&ep->lock, flags);
<------><------>ep->freqm = f;
<------><------>spin_unlock_irqrestore(&ep->lock, flags);
<------>} else {
<------><------>/*
<------><------> * Out of range; maybe the shift value is wrong.
<------><------> * Reset it so that we autodetect again the next time.
<------><------> */
<------><------>ep->freqshift = INT_MIN;
<------>}
}