diff options
Diffstat (limited to 'sound/usb/usbmidi.c')
| -rw-r--r-- | sound/usb/usbmidi.c | 79 |
1 files changed, 60 insertions, 19 deletions
diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c index 32d70cc..0eff19c 100644 --- a/sound/usb/usbmidi.c +++ b/sound/usb/usbmidi.c @@ -45,6 +45,7 @@ #include <linux/slab.h> #include <linux/timer.h> #include <linux/usb.h> +#include <linux/wait.h> #include <sound/core.h> #include <sound/rawmidi.h> #include <sound/asequencer.h> @@ -124,9 +125,10 @@ struct snd_usb_midi_out_endpoint { struct snd_usb_midi_out_endpoint *ep; } urbs[OUTPUT_URBS]; unsigned int active_urbs; + unsigned int drain_urbs; int max_transfer; /* size of urb buffer */ struct tasklet_struct tasklet; - + unsigned int next_urb; spinlock_t buffer_lock; struct usbmidi_out_port { @@ -145,6 +147,8 @@ struct snd_usb_midi_out_endpoint { uint8_t data[2]; } ports[0x10]; int current_port; + + wait_queue_head_t drain_wait; }; struct snd_usb_midi_in_endpoint { @@ -259,9 +263,15 @@ static void snd_usbmidi_out_urb_complete(struct urb* urb) { struct out_urb_context *context = urb->context; struct snd_usb_midi_out_endpoint* ep = context->ep; + unsigned int urb_index; spin_lock(&ep->buffer_lock); - ep->active_urbs &= ~(1 << (context - ep->urbs)); + urb_index = context - ep->urbs; + ep->active_urbs &= ~(1 << urb_index); + if (unlikely(ep->drain_urbs)) { + ep->drain_urbs &= ~(1 << urb_index); + wake_up(&ep->drain_wait); + } spin_unlock(&ep->buffer_lock); if (urb->status < 0) { int err = snd_usbmidi_urb_error(urb->status); @@ -291,28 +301,28 @@ static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint* ep) return; } + urb_index = ep->next_urb; for (;;) { - urb = NULL; - for (urb_index = 0; urb_index < OUTPUT_URBS; ++urb_index) - if (!(ep->active_urbs & (1 << urb_index))) { - urb = ep->urbs[urb_index].urb; + if (!(ep->active_urbs & (1 << urb_index))) { + urb = ep->urbs[urb_index].urb; + urb->transfer_buffer_length = 0; + ep->umidi->usb_protocol_ops->output(ep, urb); + if (urb->transfer_buffer_length == 0) break; - } - if (!urb) - break; - - urb->transfer_buffer_length = 0; - ep->umidi->usb_protocol_ops->output(ep, urb); - if (urb->transfer_buffer_length == 0) - break; - dump_urb("sending", urb->transfer_buffer, - urb->transfer_buffer_length); - urb->dev = ep->umidi->chip->dev; - if (snd_usbmidi_submit_urb(urb, GFP_ATOMIC) < 0) + dump_urb("sending", urb->transfer_buffer, + urb->transfer_buffer_length); + urb->dev = ep->umidi->chip->dev; + if (snd_usbmidi_submit_urb(urb, GFP_ATOMIC) < 0) + break; + ep->active_urbs |= 1 << urb_index; + } + if (++urb_index >= OUTPUT_URBS) + urb_index = 0; + if (urb_index == ep->next_urb) break; - ep->active_urbs |= 1 << urb_index; } + ep->next_urb = urb_index; spin_unlock_irqrestore(&ep->buffer_lock, flags); } @@ -913,6 +923,35 @@ static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream, } } +static void snd_usbmidi_output_drain(struct snd_rawmidi_substream *substream) +{ + struct usbmidi_out_port* port = substream->runtime->private_data; + struct snd_usb_midi_out_endpoint *ep = port->ep; + unsigned int drain_urbs; + DEFINE_WAIT(wait); + long timeout = msecs_to_jiffies(50); + + /* + * The substream buffer is empty, but some data might still be in the + * currently active URBs, so we have to wait for those to complete. + */ + spin_lock_irq(&ep->buffer_lock); + drain_urbs = ep->active_urbs; + if (drain_urbs) { + ep->drain_urbs |= drain_urbs; + do { + prepare_to_wait(&ep->drain_wait, &wait, + TASK_UNINTERRUPTIBLE); + spin_unlock_irq(&ep->buffer_lock); + timeout = schedule_timeout(timeout); + spin_lock_irq(&ep->buffer_lock); + drain_urbs &= ep->drain_urbs; + } while (drain_urbs && timeout); + finish_wait(&ep->drain_wait, &wait); + } + spin_unlock_irq(&ep->buffer_lock); +} + static int snd_usbmidi_input_open(struct snd_rawmidi_substream *substream) { return 0; @@ -937,6 +976,7 @@ static struct snd_rawmidi_ops snd_usbmidi_output_ops = { .open = snd_usbmidi_output_open, .close = snd_usbmidi_output_close, .trigger = snd_usbmidi_output_trigger, + .drain = snd_usbmidi_output_drain, }; static struct snd_rawmidi_ops snd_usbmidi_input_ops = { @@ -1103,6 +1143,7 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi, spin_lock_init(&ep->buffer_lock); tasklet_init(&ep->tasklet, snd_usbmidi_out_tasklet, (unsigned long)ep); + init_waitqueue_head(&ep->drain_wait); for (i = 0; i < 0x10; ++i) if (ep_info->out_cables & (1 << i)) { |
