forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
756 lines
18 KiB
756 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Copyright (C) 2007, 2008 Karsten Wiese <[email protected]> |
|
*/ |
|
|
|
#include <linux/usb.h> |
|
#include <linux/gfp.h> |
|
|
|
#include "usb_stream.h" |
|
|
|
|
|
/* setup */ |
|
|
|
static unsigned usb_stream_next_packet_size(struct usb_stream_kernel *sk) |
|
{ |
|
struct usb_stream *s = sk->s; |
|
sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn; |
|
return (sk->out_phase_peeked >> 16) * s->cfg.frame_size; |
|
} |
|
|
|
static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb) |
|
{ |
|
struct usb_stream *s = sk->s; |
|
int pack, lb = 0; |
|
|
|
for (pack = 0; pack < sk->n_o_ps; pack++) { |
|
int l = usb_stream_next_packet_size(sk); |
|
if (s->idle_outsize + lb + l > s->period_size) |
|
goto check; |
|
|
|
sk->out_phase = sk->out_phase_peeked; |
|
urb->iso_frame_desc[pack].offset = lb; |
|
urb->iso_frame_desc[pack].length = l; |
|
lb += l; |
|
} |
|
snd_printdd(KERN_DEBUG "%i\n", lb); |
|
|
|
check: |
|
urb->number_of_packets = pack; |
|
urb->transfer_buffer_length = lb; |
|
s->idle_outsize += lb - s->period_size; |
|
snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize, |
|
lb, s->period_size); |
|
} |
|
|
|
static int init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, |
|
struct urb **urbs, char *transfer, |
|
struct usb_device *dev, int pipe) |
|
{ |
|
int u, p; |
|
int maxpacket = use_packsize ? |
|
use_packsize : usb_maxpacket(dev, pipe, usb_pipeout(pipe)); |
|
int transfer_length = maxpacket * sk->n_o_ps; |
|
|
|
for (u = 0; u < USB_STREAM_NURBS; |
|
++u, transfer += transfer_length) { |
|
struct urb *urb = urbs[u]; |
|
struct usb_iso_packet_descriptor *desc; |
|
urb->transfer_buffer = transfer; |
|
urb->dev = dev; |
|
urb->pipe = pipe; |
|
urb->number_of_packets = sk->n_o_ps; |
|
urb->context = sk; |
|
urb->interval = 1; |
|
if (usb_pipeout(pipe)) |
|
continue; |
|
if (usb_urb_ep_type_check(urb)) |
|
return -EINVAL; |
|
|
|
urb->transfer_buffer_length = transfer_length; |
|
desc = urb->iso_frame_desc; |
|
desc->offset = 0; |
|
desc->length = maxpacket; |
|
for (p = 1; p < sk->n_o_ps; ++p) { |
|
desc[p].offset = desc[p - 1].offset + maxpacket; |
|
desc[p].length = maxpacket; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, |
|
struct usb_device *dev, int in_pipe, int out_pipe) |
|
{ |
|
struct usb_stream *s = sk->s; |
|
char *indata = (char *)s + sizeof(*s) + |
|
sizeof(struct usb_stream_packet) * |
|
s->inpackets; |
|
int u; |
|
|
|
for (u = 0; u < USB_STREAM_NURBS; ++u) { |
|
sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); |
|
if (!sk->inurb[u]) |
|
return -ENOMEM; |
|
|
|
sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); |
|
if (!sk->outurb[u]) |
|
return -ENOMEM; |
|
} |
|
|
|
if (init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe) || |
|
init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev, |
|
out_pipe)) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
|
|
/* |
|
* 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 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 rate) |
|
{ |
|
return ((rate << 10) + 62) / 125; |
|
} |
|
|
|
void usb_stream_free(struct usb_stream_kernel *sk) |
|
{ |
|
struct usb_stream *s; |
|
unsigned u; |
|
|
|
for (u = 0; u < USB_STREAM_NURBS; ++u) { |
|
usb_free_urb(sk->inurb[u]); |
|
sk->inurb[u] = NULL; |
|
usb_free_urb(sk->outurb[u]); |
|
sk->outurb[u] = NULL; |
|
} |
|
|
|
s = sk->s; |
|
if (!s) |
|
return; |
|
|
|
free_pages_exact(sk->write_page, s->write_size); |
|
sk->write_page = NULL; |
|
free_pages_exact(s, s->read_size); |
|
sk->s = NULL; |
|
} |
|
|
|
struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk, |
|
struct usb_device *dev, |
|
unsigned in_endpoint, unsigned out_endpoint, |
|
unsigned sample_rate, unsigned use_packsize, |
|
unsigned period_frames, unsigned frame_size) |
|
{ |
|
int packets, max_packsize; |
|
int in_pipe, out_pipe; |
|
int read_size = sizeof(struct usb_stream); |
|
int write_size; |
|
int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000; |
|
|
|
in_pipe = usb_rcvisocpipe(dev, in_endpoint); |
|
out_pipe = usb_sndisocpipe(dev, out_endpoint); |
|
|
|
max_packsize = use_packsize ? |
|
use_packsize : usb_maxpacket(dev, in_pipe, 0); |
|
|
|
/* |
|
t_period = period_frames / sample_rate |
|
iso_packs = t_period / t_iso_frame |
|
= (period_frames / sample_rate) * (1 / t_iso_frame) |
|
*/ |
|
|
|
packets = period_frames * usb_frames / sample_rate + 1; |
|
|
|
if (dev->speed == USB_SPEED_HIGH) |
|
packets = (packets + 7) & ~7; |
|
|
|
read_size += packets * USB_STREAM_URBDEPTH * |
|
(max_packsize + sizeof(struct usb_stream_packet)); |
|
|
|
max_packsize = usb_maxpacket(dev, out_pipe, 1); |
|
write_size = max_packsize * packets * USB_STREAM_URBDEPTH; |
|
|
|
if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) { |
|
snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n"); |
|
goto out; |
|
} |
|
|
|
sk->s = alloc_pages_exact(read_size, |
|
GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN); |
|
if (!sk->s) { |
|
pr_warn("us122l: couldn't allocate read buffer\n"); |
|
goto out; |
|
} |
|
sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION; |
|
|
|
sk->s->read_size = read_size; |
|
|
|
sk->s->cfg.sample_rate = sample_rate; |
|
sk->s->cfg.frame_size = frame_size; |
|
sk->n_o_ps = packets; |
|
sk->s->inpackets = packets * USB_STREAM_URBDEPTH; |
|
sk->s->cfg.period_frames = period_frames; |
|
sk->s->period_size = frame_size * period_frames; |
|
|
|
sk->s->write_size = write_size; |
|
|
|
sk->write_page = alloc_pages_exact(write_size, |
|
GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN); |
|
if (!sk->write_page) { |
|
pr_warn("us122l: couldn't allocate write buffer\n"); |
|
usb_stream_free(sk); |
|
return NULL; |
|
} |
|
|
|
/* calculate the frequency in 16.16 format */ |
|
if (dev->speed == USB_SPEED_FULL) |
|
sk->freqn = get_usb_full_speed_rate(sample_rate); |
|
else |
|
sk->freqn = get_usb_high_speed_rate(sample_rate); |
|
|
|
if (init_urbs(sk, use_packsize, dev, in_pipe, out_pipe) < 0) { |
|
usb_stream_free(sk); |
|
return NULL; |
|
} |
|
|
|
sk->s->state = usb_stream_stopped; |
|
out: |
|
return sk->s; |
|
} |
|
|
|
|
|
/* start */ |
|
|
|
static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb) |
|
{ |
|
bool r; |
|
if (unlikely(urb->status)) { |
|
if (urb->status != -ESHUTDOWN && urb->status != -ENOENT) |
|
snd_printk(KERN_WARNING "status=%i\n", urb->status); |
|
sk->iso_frame_balance = 0x7FFFFFFF; |
|
return false; |
|
} |
|
r = sk->iso_frame_balance == 0; |
|
if (!r) |
|
sk->i_urb = urb; |
|
return r; |
|
} |
|
|
|
static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb) |
|
{ |
|
sk->iso_frame_balance += urb->number_of_packets; |
|
return balance_check(sk, urb); |
|
} |
|
|
|
static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb) |
|
{ |
|
sk->iso_frame_balance -= urb->number_of_packets; |
|
return balance_check(sk, urb); |
|
} |
|
|
|
static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *)) |
|
{ |
|
int u; |
|
|
|
for (u = 0; u < USB_STREAM_NURBS; u++) { |
|
struct urb *urb = urbs[u]; |
|
urb->complete = complete; |
|
} |
|
} |
|
|
|
static int usb_stream_prepare_playback(struct usb_stream_kernel *sk, |
|
struct urb *inurb) |
|
{ |
|
struct usb_stream *s = sk->s; |
|
struct urb *io; |
|
struct usb_iso_packet_descriptor *id, *od; |
|
int p = 0, lb = 0, l = 0; |
|
|
|
io = sk->idle_outurb; |
|
od = io->iso_frame_desc; |
|
|
|
for (; s->sync_packet < 0; ++p, ++s->sync_packet) { |
|
struct urb *ii = sk->completed_inurb; |
|
id = ii->iso_frame_desc + |
|
ii->number_of_packets + s->sync_packet; |
|
l = id->actual_length; |
|
|
|
od[p].length = l; |
|
od[p].offset = lb; |
|
lb += l; |
|
} |
|
|
|
for (; |
|
s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps; |
|
++p, ++s->sync_packet) { |
|
l = inurb->iso_frame_desc[s->sync_packet].actual_length; |
|
|
|
if (s->idle_outsize + lb + l > s->period_size) |
|
goto check_ok; |
|
|
|
od[p].length = l; |
|
od[p].offset = lb; |
|
lb += l; |
|
} |
|
|
|
check_ok: |
|
s->sync_packet -= inurb->number_of_packets; |
|
if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) { |
|
snd_printk(KERN_WARNING "invalid sync_packet = %i;" |
|
" p=%i nop=%i %i %x %x %x > %x\n", |
|
s->sync_packet, p, inurb->number_of_packets, |
|
s->idle_outsize + lb + l, |
|
s->idle_outsize, lb, l, |
|
s->period_size); |
|
return -1; |
|
} |
|
if (unlikely(lb % s->cfg.frame_size)) { |
|
snd_printk(KERN_WARNING"invalid outsize = %i\n", |
|
lb); |
|
return -1; |
|
} |
|
s->idle_outsize += lb - s->period_size; |
|
io->number_of_packets = p; |
|
io->transfer_buffer_length = lb; |
|
if (s->idle_outsize <= 0) |
|
return 0; |
|
|
|
snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize); |
|
return -1; |
|
} |
|
|
|
static void prepare_inurb(int number_of_packets, struct urb *iu) |
|
{ |
|
struct usb_iso_packet_descriptor *id; |
|
int p; |
|
|
|
iu->number_of_packets = number_of_packets; |
|
id = iu->iso_frame_desc; |
|
id->offset = 0; |
|
for (p = 0; p < iu->number_of_packets - 1; ++p) |
|
id[p + 1].offset = id[p].offset + id[p].length; |
|
|
|
iu->transfer_buffer_length = |
|
id[0].length * iu->number_of_packets; |
|
} |
|
|
|
static int submit_urbs(struct usb_stream_kernel *sk, |
|
struct urb *inurb, struct urb *outurb) |
|
{ |
|
int err; |
|
prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb); |
|
err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC); |
|
if (err < 0) |
|
goto report_failure; |
|
|
|
sk->idle_inurb = sk->completed_inurb; |
|
sk->completed_inurb = inurb; |
|
err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC); |
|
if (err < 0) |
|
goto report_failure; |
|
|
|
sk->idle_outurb = sk->completed_outurb; |
|
sk->completed_outurb = outurb; |
|
return 0; |
|
|
|
report_failure: |
|
snd_printk(KERN_ERR "%i\n", err); |
|
return err; |
|
} |
|
|
|
#ifdef DEBUG_LOOP_BACK |
|
/* |
|
This loop_back() shows how to read/write the period data. |
|
*/ |
|
static void loop_back(struct usb_stream *s) |
|
{ |
|
char *i, *o; |
|
int il, ol, l, p; |
|
struct urb *iu; |
|
struct usb_iso_packet_descriptor *id; |
|
|
|
o = s->playback1st_to; |
|
ol = s->playback1st_size; |
|
l = 0; |
|
|
|
if (s->insplit_pack >= 0) { |
|
iu = sk->idle_inurb; |
|
id = iu->iso_frame_desc; |
|
p = s->insplit_pack; |
|
} else |
|
goto second; |
|
loop: |
|
for (; p < iu->number_of_packets && l < s->period_size; ++p) { |
|
i = iu->transfer_buffer + id[p].offset; |
|
il = id[p].actual_length; |
|
if (l + il > s->period_size) |
|
il = s->period_size - l; |
|
if (il <= ol) { |
|
memcpy(o, i, il); |
|
o += il; |
|
ol -= il; |
|
} else { |
|
memcpy(o, i, ol); |
|
singen_6pack(o, ol); |
|
o = s->playback_to; |
|
memcpy(o, i + ol, il - ol); |
|
o += il - ol; |
|
ol = s->period_size - s->playback1st_size; |
|
} |
|
l += il; |
|
} |
|
if (iu == sk->completed_inurb) { |
|
if (l != s->period_size) |
|
printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__, |
|
l/(int)s->cfg.frame_size); |
|
|
|
return; |
|
} |
|
second: |
|
iu = sk->completed_inurb; |
|
id = iu->iso_frame_desc; |
|
p = 0; |
|
goto loop; |
|
|
|
} |
|
#else |
|
static void loop_back(struct usb_stream *s) |
|
{ |
|
} |
|
#endif |
|
|
|
static void stream_idle(struct usb_stream_kernel *sk, |
|
struct urb *inurb, struct urb *outurb) |
|
{ |
|
struct usb_stream *s = sk->s; |
|
int l, p; |
|
int insize = s->idle_insize; |
|
int urb_size = 0; |
|
|
|
s->inpacket_split = s->next_inpacket_split; |
|
s->inpacket_split_at = s->next_inpacket_split_at; |
|
s->next_inpacket_split = -1; |
|
s->next_inpacket_split_at = 0; |
|
|
|
for (p = 0; p < inurb->number_of_packets; ++p) { |
|
struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc; |
|
l = id[p].actual_length; |
|
if (unlikely(l == 0 || id[p].status)) { |
|
snd_printk(KERN_WARNING "underrun, status=%u\n", |
|
id[p].status); |
|
goto err_out; |
|
} |
|
s->inpacket_head++; |
|
s->inpacket_head %= s->inpackets; |
|
if (s->inpacket_split == -1) |
|
s->inpacket_split = s->inpacket_head; |
|
|
|
s->inpacket[s->inpacket_head].offset = |
|
id[p].offset + (inurb->transfer_buffer - (void *)s); |
|
s->inpacket[s->inpacket_head].length = l; |
|
if (insize + l > s->period_size && |
|
s->next_inpacket_split == -1) { |
|
s->next_inpacket_split = s->inpacket_head; |
|
s->next_inpacket_split_at = s->period_size - insize; |
|
} |
|
insize += l; |
|
urb_size += l; |
|
} |
|
s->idle_insize += urb_size - s->period_size; |
|
if (s->idle_insize < 0) { |
|
snd_printk(KERN_WARNING "%i\n", |
|
(s->idle_insize)/(int)s->cfg.frame_size); |
|
goto err_out; |
|
} |
|
s->insize_done += urb_size; |
|
|
|
l = s->idle_outsize; |
|
s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer - |
|
sk->write_page) - l; |
|
|
|
if (usb_stream_prepare_playback(sk, inurb) < 0) |
|
goto err_out; |
|
|
|
s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l; |
|
s->outpacket[1].offset = sk->completed_outurb->transfer_buffer - |
|
sk->write_page; |
|
|
|
if (submit_urbs(sk, inurb, outurb) < 0) |
|
goto err_out; |
|
|
|
loop_back(s); |
|
s->periods_done++; |
|
wake_up_all(&sk->sleep); |
|
return; |
|
err_out: |
|
s->state = usb_stream_xrun; |
|
wake_up_all(&sk->sleep); |
|
} |
|
|
|
static void i_capture_idle(struct urb *urb) |
|
{ |
|
struct usb_stream_kernel *sk = urb->context; |
|
if (balance_capture(sk, urb)) |
|
stream_idle(sk, urb, sk->i_urb); |
|
} |
|
|
|
static void i_playback_idle(struct urb *urb) |
|
{ |
|
struct usb_stream_kernel *sk = urb->context; |
|
if (balance_playback(sk, urb)) |
|
stream_idle(sk, sk->i_urb, urb); |
|
} |
|
|
|
static void stream_start(struct usb_stream_kernel *sk, |
|
struct urb *inurb, struct urb *outurb) |
|
{ |
|
struct usb_stream *s = sk->s; |
|
if (s->state >= usb_stream_sync1) { |
|
int l, p, max_diff, max_diff_0; |
|
int urb_size = 0; |
|
unsigned frames_per_packet, min_frames = 0; |
|
frames_per_packet = (s->period_size - s->idle_insize); |
|
frames_per_packet <<= 8; |
|
frames_per_packet /= |
|
s->cfg.frame_size * inurb->number_of_packets; |
|
frames_per_packet++; |
|
|
|
max_diff_0 = s->cfg.frame_size; |
|
if (s->cfg.period_frames >= 256) |
|
max_diff_0 <<= 1; |
|
if (s->cfg.period_frames >= 1024) |
|
max_diff_0 <<= 1; |
|
max_diff = max_diff_0; |
|
for (p = 0; p < inurb->number_of_packets; ++p) { |
|
int diff; |
|
l = inurb->iso_frame_desc[p].actual_length; |
|
urb_size += l; |
|
|
|
min_frames += frames_per_packet; |
|
diff = urb_size - |
|
(min_frames >> 8) * s->cfg.frame_size; |
|
if (diff < max_diff) { |
|
snd_printdd(KERN_DEBUG "%i %i %i %i\n", |
|
s->insize_done, |
|
urb_size / (int)s->cfg.frame_size, |
|
inurb->number_of_packets, diff); |
|
max_diff = diff; |
|
} |
|
} |
|
s->idle_insize -= max_diff - max_diff_0; |
|
s->idle_insize += urb_size - s->period_size; |
|
if (s->idle_insize < 0) { |
|
snd_printk(KERN_WARNING "%i %i %i\n", |
|
s->idle_insize, urb_size, s->period_size); |
|
return; |
|
} else if (s->idle_insize == 0) { |
|
s->next_inpacket_split = |
|
(s->inpacket_head + 1) % s->inpackets; |
|
s->next_inpacket_split_at = 0; |
|
} else { |
|
unsigned split = s->inpacket_head; |
|
l = s->idle_insize; |
|
while (l > s->inpacket[split].length) { |
|
l -= s->inpacket[split].length; |
|
if (split == 0) |
|
split = s->inpackets - 1; |
|
else |
|
split--; |
|
} |
|
s->next_inpacket_split = split; |
|
s->next_inpacket_split_at = |
|
s->inpacket[split].length - l; |
|
} |
|
|
|
s->insize_done += urb_size; |
|
|
|
if (usb_stream_prepare_playback(sk, inurb) < 0) |
|
return; |
|
|
|
} else |
|
playback_prep_freqn(sk, sk->idle_outurb); |
|
|
|
if (submit_urbs(sk, inurb, outurb) < 0) |
|
return; |
|
|
|
if (s->state == usb_stream_sync1 && s->insize_done > 360000) { |
|
/* just guesswork ^^^^^^ */ |
|
s->state = usb_stream_ready; |
|
subs_set_complete(sk->inurb, i_capture_idle); |
|
subs_set_complete(sk->outurb, i_playback_idle); |
|
} |
|
} |
|
|
|
static void i_capture_start(struct urb *urb) |
|
{ |
|
struct usb_iso_packet_descriptor *id = urb->iso_frame_desc; |
|
struct usb_stream_kernel *sk = urb->context; |
|
struct usb_stream *s = sk->s; |
|
int p; |
|
int empty = 0; |
|
|
|
if (urb->status) { |
|
snd_printk(KERN_WARNING "status=%i\n", urb->status); |
|
return; |
|
} |
|
|
|
for (p = 0; p < urb->number_of_packets; ++p) { |
|
int l = id[p].actual_length; |
|
if (l < s->cfg.frame_size) { |
|
++empty; |
|
if (s->state >= usb_stream_sync0) { |
|
snd_printk(KERN_WARNING "%i\n", l); |
|
return; |
|
} |
|
} |
|
s->inpacket_head++; |
|
s->inpacket_head %= s->inpackets; |
|
s->inpacket[s->inpacket_head].offset = |
|
id[p].offset + (urb->transfer_buffer - (void *)s); |
|
s->inpacket[s->inpacket_head].length = l; |
|
} |
|
#ifdef SHOW_EMPTY |
|
if (empty) { |
|
printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__, |
|
urb->iso_frame_desc[0].actual_length); |
|
for (pack = 1; pack < urb->number_of_packets; ++pack) { |
|
int l = urb->iso_frame_desc[pack].actual_length; |
|
printk(KERN_CONT " %i", l); |
|
} |
|
printk(KERN_CONT "\n"); |
|
} |
|
#endif |
|
if (!empty && s->state < usb_stream_sync1) |
|
++s->state; |
|
|
|
if (balance_capture(sk, urb)) |
|
stream_start(sk, urb, sk->i_urb); |
|
} |
|
|
|
static void i_playback_start(struct urb *urb) |
|
{ |
|
struct usb_stream_kernel *sk = urb->context; |
|
if (balance_playback(sk, urb)) |
|
stream_start(sk, sk->i_urb, urb); |
|
} |
|
|
|
int usb_stream_start(struct usb_stream_kernel *sk) |
|
{ |
|
struct usb_stream *s = sk->s; |
|
int frame = 0, iters = 0; |
|
int u, err; |
|
int try = 0; |
|
|
|
if (s->state != usb_stream_stopped) |
|
return -EAGAIN; |
|
|
|
subs_set_complete(sk->inurb, i_capture_start); |
|
subs_set_complete(sk->outurb, i_playback_start); |
|
memset(sk->write_page, 0, s->write_size); |
|
dotry: |
|
s->insize_done = 0; |
|
s->idle_insize = 0; |
|
s->idle_outsize = 0; |
|
s->sync_packet = -1; |
|
s->inpacket_head = -1; |
|
sk->iso_frame_balance = 0; |
|
++try; |
|
for (u = 0; u < 2; u++) { |
|
struct urb *inurb = sk->inurb[u]; |
|
struct urb *outurb = sk->outurb[u]; |
|
playback_prep_freqn(sk, outurb); |
|
inurb->number_of_packets = outurb->number_of_packets; |
|
inurb->transfer_buffer_length = |
|
inurb->number_of_packets * |
|
inurb->iso_frame_desc[0].length; |
|
|
|
if (u == 0) { |
|
int now; |
|
struct usb_device *dev = inurb->dev; |
|
frame = usb_get_current_frame_number(dev); |
|
do { |
|
now = usb_get_current_frame_number(dev); |
|
++iters; |
|
} while (now > -1 && now == frame); |
|
} |
|
err = usb_submit_urb(inurb, GFP_ATOMIC); |
|
if (err < 0) { |
|
snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])" |
|
" returned %i\n", u, err); |
|
return err; |
|
} |
|
err = usb_submit_urb(outurb, GFP_ATOMIC); |
|
if (err < 0) { |
|
snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])" |
|
" returned %i\n", u, err); |
|
return err; |
|
} |
|
|
|
if (inurb->start_frame != outurb->start_frame) { |
|
snd_printd(KERN_DEBUG |
|
"u[%i] start_frames differ in:%u out:%u\n", |
|
u, inurb->start_frame, outurb->start_frame); |
|
goto check_retry; |
|
} |
|
} |
|
snd_printdd(KERN_DEBUG "%i %i\n", frame, iters); |
|
try = 0; |
|
check_retry: |
|
if (try) { |
|
usb_stream_stop(sk); |
|
if (try < 5) { |
|
msleep(1500); |
|
snd_printd(KERN_DEBUG "goto dotry;\n"); |
|
goto dotry; |
|
} |
|
snd_printk(KERN_WARNING"couldn't start" |
|
" all urbs on the same start_frame.\n"); |
|
return -EFAULT; |
|
} |
|
|
|
sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2]; |
|
sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2]; |
|
sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1]; |
|
sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1]; |
|
|
|
/* wait, check */ |
|
{ |
|
int wait_ms = 3000; |
|
while (s->state != usb_stream_ready && wait_ms > 0) { |
|
snd_printdd(KERN_DEBUG "%i\n", s->state); |
|
msleep(200); |
|
wait_ms -= 200; |
|
} |
|
} |
|
|
|
return s->state == usb_stream_ready ? 0 : -EFAULT; |
|
} |
|
|
|
|
|
/* stop */ |
|
|
|
void usb_stream_stop(struct usb_stream_kernel *sk) |
|
{ |
|
int u; |
|
if (!sk->s) |
|
return; |
|
for (u = 0; u < USB_STREAM_NURBS; ++u) { |
|
usb_kill_urb(sk->inurb[u]); |
|
usb_kill_urb(sk->outurb[u]); |
|
} |
|
sk->s->state = usb_stream_stopped; |
|
msleep(400); |
|
}
|
|
|