776 lines
23 KiB
C
776 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*/
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/* USX2Y "rawusb" aka hwdep_pcm implementation
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Its usb's unableness to atomically handle power of 2 period sized data chuncs
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at standard samplerates,
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what led to this part of the usx2y module:
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It provides the alsa kernel half of the usx2y-alsa-jack driver pair.
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The pair uses a hardware dependent alsa-device for mmaped pcm transport.
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Advantage achieved:
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The usb_hc moves pcm data from/into memory via DMA.
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That memory is mmaped by jack's usx2y driver.
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Jack's usx2y driver is the first/last to read/write pcm data.
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Read/write is a combination of power of 2 period shaping and
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float/int conversation.
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Compared to mainline alsa/jack we leave out power of 2 period shaping inside
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snd-usb-usx2y which needs memcpy() and additional buffers.
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As a side effect possible unwanted pcm-data coruption resulting of
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standard alsa's snd-usb-usx2y period shaping scheme falls away.
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Result is sane jack operation at buffering schemes down to 128frames,
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2 periods.
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plain usx2y alsa mode is able to achieve 64frames, 4periods, but only at the
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cost of easier triggered i.e. aeolus xruns (128 or 256frames,
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2periods works but is useless cause of crackling).
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This is a first "proof of concept" implementation.
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Later, functionalities should migrate to more appropriate places:
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Userland:
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- The jackd could mmap its float-pcm buffers directly from alsa-lib.
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- alsa-lib could provide power of 2 period sized shaping combined with int/float
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conversation.
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Currently the usx2y jack driver provides above 2 services.
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Kernel:
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- rawusb dma pcm buffer transport should go to snd-usb-lib, so also snd-usb-audio
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devices can use it.
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Currently rawusb dma pcm buffer transport (this file) is only available to snd-usb-usx2y.
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*/
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#include <linux/delay.h>
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#include <linux/gfp.h>
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#include "usbusx2yaudio.c"
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#if defined(USX2Y_NRPACKS_VARIABLE) || USX2Y_NRPACKS == 1
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#include <sound/hwdep.h>
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static int usx2y_usbpcm_urb_capt_retire(struct snd_usx2y_substream *subs)
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{
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struct urb *urb = subs->completed_urb;
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struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
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int i, lens = 0, hwptr_done = subs->hwptr_done;
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struct usx2ydev *usx2y = subs->usx2y;
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int head;
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if (usx2y->hwdep_pcm_shm->capture_iso_start < 0) { //FIXME
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head = usx2y->hwdep_pcm_shm->captured_iso_head + 1;
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if (head >= ARRAY_SIZE(usx2y->hwdep_pcm_shm->captured_iso))
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head = 0;
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usx2y->hwdep_pcm_shm->capture_iso_start = head;
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snd_printdd("cap start %i\n", head);
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}
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for (i = 0; i < nr_of_packs(); i++) {
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if (urb->iso_frame_desc[i].status) { /* active? hmm, skip this */
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snd_printk(KERN_ERR
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"active frame status %i. Most probably some hardware problem.\n",
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urb->iso_frame_desc[i].status);
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return urb->iso_frame_desc[i].status;
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}
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lens += urb->iso_frame_desc[i].actual_length / usx2y->stride;
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}
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hwptr_done += lens;
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if (hwptr_done >= runtime->buffer_size)
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hwptr_done -= runtime->buffer_size;
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subs->hwptr_done = hwptr_done;
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subs->transfer_done += lens;
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/* update the pointer, call callback if necessary */
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if (subs->transfer_done >= runtime->period_size) {
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subs->transfer_done -= runtime->period_size;
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snd_pcm_period_elapsed(subs->pcm_substream);
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}
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return 0;
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}
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static int usx2y_iso_frames_per_buffer(struct snd_pcm_runtime *runtime,
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struct usx2ydev *usx2y)
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{
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return (runtime->buffer_size * 1000) / usx2y->rate + 1; //FIXME: so far only correct period_size == 2^x ?
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}
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/*
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* prepare urb for playback data pipe
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*
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* we copy the data directly from the pcm buffer.
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* the current position to be copied is held in hwptr field.
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* since a urb can handle only a single linear buffer, if the total
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* transferred area overflows the buffer boundary, we cannot send
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* it directly from the buffer. thus the data is once copied to
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* a temporary buffer and urb points to that.
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*/
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static int usx2y_hwdep_urb_play_prepare(struct snd_usx2y_substream *subs,
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struct urb *urb)
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{
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int count, counts, pack;
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struct usx2ydev *usx2y = subs->usx2y;
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struct snd_usx2y_hwdep_pcm_shm *shm = usx2y->hwdep_pcm_shm;
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struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
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if (shm->playback_iso_start < 0) {
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shm->playback_iso_start = shm->captured_iso_head -
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usx2y_iso_frames_per_buffer(runtime, usx2y);
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if (shm->playback_iso_start < 0)
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shm->playback_iso_start += ARRAY_SIZE(shm->captured_iso);
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shm->playback_iso_head = shm->playback_iso_start;
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}
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count = 0;
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for (pack = 0; pack < nr_of_packs(); pack++) {
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/* calculate the size of a packet */
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counts = shm->captured_iso[shm->playback_iso_head].length / usx2y->stride;
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if (counts < 43 || counts > 50) {
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snd_printk(KERN_ERR "should not be here with counts=%i\n", counts);
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return -EPIPE;
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}
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/* set up descriptor */
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urb->iso_frame_desc[pack].offset = shm->captured_iso[shm->playback_iso_head].offset;
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urb->iso_frame_desc[pack].length = shm->captured_iso[shm->playback_iso_head].length;
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if (atomic_read(&subs->state) != STATE_RUNNING)
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memset((char *)urb->transfer_buffer + urb->iso_frame_desc[pack].offset, 0,
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urb->iso_frame_desc[pack].length);
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if (++shm->playback_iso_head >= ARRAY_SIZE(shm->captured_iso))
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shm->playback_iso_head = 0;
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count += counts;
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}
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urb->transfer_buffer_length = count * usx2y->stride;
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return 0;
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}
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static void usx2y_usbpcm_urb_capt_iso_advance(struct snd_usx2y_substream *subs,
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struct urb *urb)
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{
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struct usb_iso_packet_descriptor *desc;
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struct snd_usx2y_hwdep_pcm_shm *shm;
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int pack, head;
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for (pack = 0; pack < nr_of_packs(); ++pack) {
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desc = urb->iso_frame_desc + pack;
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if (subs) {
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shm = subs->usx2y->hwdep_pcm_shm;
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head = shm->captured_iso_head + 1;
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if (head >= ARRAY_SIZE(shm->captured_iso))
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head = 0;
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shm->captured_iso[head].frame = urb->start_frame + pack;
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shm->captured_iso[head].offset = desc->offset;
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shm->captured_iso[head].length = desc->actual_length;
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shm->captured_iso_head = head;
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shm->captured_iso_frames++;
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}
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desc->offset += desc->length * NRURBS * nr_of_packs();
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if (desc->offset + desc->length >= SSS)
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desc->offset -= (SSS - desc->length);
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}
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}
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static int usx2y_usbpcm_usbframe_complete(struct snd_usx2y_substream *capsubs,
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struct snd_usx2y_substream *capsubs2,
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struct snd_usx2y_substream *playbacksubs,
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int frame)
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{
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int err, state;
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struct urb *urb = playbacksubs->completed_urb;
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state = atomic_read(&playbacksubs->state);
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if (urb) {
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if (state == STATE_RUNNING)
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usx2y_urb_play_retire(playbacksubs, urb);
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else if (state >= STATE_PRERUNNING)
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atomic_inc(&playbacksubs->state);
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} else {
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switch (state) {
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case STATE_STARTING1:
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urb = playbacksubs->urb[0];
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atomic_inc(&playbacksubs->state);
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break;
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case STATE_STARTING2:
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urb = playbacksubs->urb[1];
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atomic_inc(&playbacksubs->state);
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break;
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}
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}
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if (urb) {
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err = usx2y_hwdep_urb_play_prepare(playbacksubs, urb);
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if (err)
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return err;
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err = usx2y_hwdep_urb_play_prepare(playbacksubs, urb);
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if (err)
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return err;
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}
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playbacksubs->completed_urb = NULL;
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state = atomic_read(&capsubs->state);
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if (state >= STATE_PREPARED) {
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if (state == STATE_RUNNING) {
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err = usx2y_usbpcm_urb_capt_retire(capsubs);
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if (err)
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return err;
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} else if (state >= STATE_PRERUNNING) {
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atomic_inc(&capsubs->state);
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}
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usx2y_usbpcm_urb_capt_iso_advance(capsubs, capsubs->completed_urb);
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if (capsubs2)
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usx2y_usbpcm_urb_capt_iso_advance(NULL, capsubs2->completed_urb);
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err = usx2y_urb_submit(capsubs, capsubs->completed_urb, frame);
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if (err)
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return err;
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if (capsubs2) {
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err = usx2y_urb_submit(capsubs2, capsubs2->completed_urb, frame);
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if (err)
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return err;
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}
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}
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capsubs->completed_urb = NULL;
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if (capsubs2)
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capsubs2->completed_urb = NULL;
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return 0;
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}
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static void i_usx2y_usbpcm_urb_complete(struct urb *urb)
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{
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struct snd_usx2y_substream *subs = urb->context;
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struct usx2ydev *usx2y = subs->usx2y;
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struct snd_usx2y_substream *capsubs, *capsubs2, *playbacksubs;
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if (unlikely(atomic_read(&subs->state) < STATE_PREPARED)) {
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snd_printdd("hcd_frame=%i ep=%i%s status=%i start_frame=%i\n",
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usb_get_current_frame_number(usx2y->dev),
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subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out",
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urb->status, urb->start_frame);
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return;
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}
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if (unlikely(urb->status)) {
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usx2y_error_urb_status(usx2y, subs, urb);
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return;
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}
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subs->completed_urb = urb;
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capsubs = usx2y->subs[SNDRV_PCM_STREAM_CAPTURE];
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capsubs2 = usx2y->subs[SNDRV_PCM_STREAM_CAPTURE + 2];
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playbacksubs = usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK];
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if (capsubs->completed_urb && atomic_read(&capsubs->state) >= STATE_PREPARED &&
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(!capsubs2 || capsubs2->completed_urb) &&
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(playbacksubs->completed_urb || atomic_read(&playbacksubs->state) < STATE_PREPARED)) {
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if (!usx2y_usbpcm_usbframe_complete(capsubs, capsubs2, playbacksubs, urb->start_frame)) {
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usx2y->wait_iso_frame += nr_of_packs();
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} else {
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snd_printdd("\n");
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usx2y_clients_stop(usx2y);
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}
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}
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}
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static void usx2y_hwdep_urb_release(struct urb **urb)
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{
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usb_kill_urb(*urb);
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usb_free_urb(*urb);
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*urb = NULL;
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}
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/*
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* release a substream
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*/
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static void usx2y_usbpcm_urbs_release(struct snd_usx2y_substream *subs)
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{
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int i;
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snd_printdd("snd_usx2y_urbs_release() %i\n", subs->endpoint);
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for (i = 0; i < NRURBS; i++)
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usx2y_hwdep_urb_release(subs->urb + i);
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}
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static void usx2y_usbpcm_subs_startup_finish(struct usx2ydev *usx2y)
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{
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usx2y_urbs_set_complete(usx2y, i_usx2y_usbpcm_urb_complete);
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usx2y->prepare_subs = NULL;
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}
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static void i_usx2y_usbpcm_subs_startup(struct urb *urb)
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{
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struct snd_usx2y_substream *subs = urb->context;
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struct usx2ydev *usx2y = subs->usx2y;
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struct snd_usx2y_substream *prepare_subs = usx2y->prepare_subs;
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struct snd_usx2y_substream *cap_subs2;
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if (prepare_subs &&
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urb->start_frame == prepare_subs->urb[0]->start_frame) {
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atomic_inc(&prepare_subs->state);
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if (prepare_subs == usx2y->subs[SNDRV_PCM_STREAM_CAPTURE]) {
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cap_subs2 = usx2y->subs[SNDRV_PCM_STREAM_CAPTURE + 2];
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if (cap_subs2)
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atomic_inc(&cap_subs2->state);
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}
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usx2y_usbpcm_subs_startup_finish(usx2y);
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wake_up(&usx2y->prepare_wait_queue);
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}
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i_usx2y_usbpcm_urb_complete(urb);
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}
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/*
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* initialize a substream's urbs
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*/
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static int usx2y_usbpcm_urbs_allocate(struct snd_usx2y_substream *subs)
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{
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int i;
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unsigned int pipe;
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int is_playback = subs == subs->usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK];
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struct usb_device *dev = subs->usx2y->dev;
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struct urb **purb;
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pipe = is_playback ? usb_sndisocpipe(dev, subs->endpoint) :
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usb_rcvisocpipe(dev, subs->endpoint);
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subs->maxpacksize = usb_maxpacket(dev, pipe);
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if (!subs->maxpacksize)
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return -EINVAL;
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/* allocate and initialize data urbs */
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for (i = 0; i < NRURBS; i++) {
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purb = subs->urb + i;
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if (*purb) {
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usb_kill_urb(*purb);
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continue;
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}
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*purb = usb_alloc_urb(nr_of_packs(), GFP_KERNEL);
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if (!*purb) {
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usx2y_usbpcm_urbs_release(subs);
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return -ENOMEM;
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}
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(*purb)->transfer_buffer = is_playback ?
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subs->usx2y->hwdep_pcm_shm->playback : (
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subs->endpoint == 0x8 ?
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subs->usx2y->hwdep_pcm_shm->capture0x8 :
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subs->usx2y->hwdep_pcm_shm->capture0xA);
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(*purb)->dev = dev;
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(*purb)->pipe = pipe;
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(*purb)->number_of_packets = nr_of_packs();
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(*purb)->context = subs;
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(*purb)->interval = 1;
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(*purb)->complete = i_usx2y_usbpcm_subs_startup;
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}
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return 0;
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}
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/*
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* free the buffer
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*/
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static int snd_usx2y_usbpcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_usx2y_substream *subs = runtime->private_data;
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struct snd_usx2y_substream *cap_subs;
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struct snd_usx2y_substream *playback_subs;
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struct snd_usx2y_substream *cap_subs2;
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mutex_lock(&subs->usx2y->pcm_mutex);
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snd_printdd("%s(%p)\n", __func__, substream);
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cap_subs2 = subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE + 2];
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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cap_subs = subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE];
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atomic_set(&subs->state, STATE_STOPPED);
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usx2y_usbpcm_urbs_release(subs);
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if (!cap_subs->pcm_substream ||
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!cap_subs->pcm_substream->runtime ||
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cap_subs->pcm_substream->runtime->state < SNDRV_PCM_STATE_PREPARED) {
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atomic_set(&cap_subs->state, STATE_STOPPED);
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if (cap_subs2)
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atomic_set(&cap_subs2->state, STATE_STOPPED);
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usx2y_usbpcm_urbs_release(cap_subs);
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if (cap_subs2)
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usx2y_usbpcm_urbs_release(cap_subs2);
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}
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} else {
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playback_subs = subs->usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK];
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if (atomic_read(&playback_subs->state) < STATE_PREPARED) {
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atomic_set(&subs->state, STATE_STOPPED);
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if (cap_subs2)
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atomic_set(&cap_subs2->state, STATE_STOPPED);
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usx2y_usbpcm_urbs_release(subs);
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if (cap_subs2)
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usx2y_usbpcm_urbs_release(cap_subs2);
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}
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}
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mutex_unlock(&subs->usx2y->pcm_mutex);
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return 0;
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}
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static void usx2y_usbpcm_subs_startup(struct snd_usx2y_substream *subs)
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{
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struct usx2ydev *usx2y = subs->usx2y;
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usx2y->prepare_subs = subs;
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subs->urb[0]->start_frame = -1;
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smp_wmb(); // Make sure above modifications are seen by i_usx2y_subs_startup()
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usx2y_urbs_set_complete(usx2y, i_usx2y_usbpcm_subs_startup);
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}
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static int usx2y_usbpcm_urbs_start(struct snd_usx2y_substream *subs)
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{
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int p, u, err, stream = subs->pcm_substream->stream;
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struct usx2ydev *usx2y = subs->usx2y;
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struct urb *urb;
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unsigned long pack;
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if (stream == SNDRV_PCM_STREAM_CAPTURE) {
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usx2y->hwdep_pcm_shm->captured_iso_head = -1;
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usx2y->hwdep_pcm_shm->captured_iso_frames = 0;
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}
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for (p = 0; 3 >= (stream + p); p += 2) {
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struct snd_usx2y_substream *subs = usx2y->subs[stream + p];
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if (subs) {
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err = usx2y_usbpcm_urbs_allocate(subs);
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if (err < 0)
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return err;
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subs->completed_urb = NULL;
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}
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}
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for (p = 0; p < 4; p++) {
|
|
struct snd_usx2y_substream *subs = usx2y->subs[p];
|
|
|
|
if (subs && atomic_read(&subs->state) >= STATE_PREPARED)
|
|
goto start;
|
|
}
|
|
|
|
start:
|
|
usx2y_usbpcm_subs_startup(subs);
|
|
for (u = 0; u < NRURBS; u++) {
|
|
for (p = 0; 3 >= (stream + p); p += 2) {
|
|
struct snd_usx2y_substream *subs = usx2y->subs[stream + p];
|
|
|
|
if (!subs)
|
|
continue;
|
|
urb = subs->urb[u];
|
|
if (usb_pipein(urb->pipe)) {
|
|
if (!u)
|
|
atomic_set(&subs->state, STATE_STARTING3);
|
|
urb->dev = usx2y->dev;
|
|
for (pack = 0; pack < nr_of_packs(); pack++) {
|
|
urb->iso_frame_desc[pack].offset = subs->maxpacksize * (pack + u * nr_of_packs());
|
|
urb->iso_frame_desc[pack].length = subs->maxpacksize;
|
|
}
|
|
urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs();
|
|
err = usb_submit_urb(urb, GFP_KERNEL);
|
|
if (err < 0) {
|
|
snd_printk(KERN_ERR "cannot usb_submit_urb() for urb %d, err = %d\n", u, err);
|
|
err = -EPIPE;
|
|
goto cleanup;
|
|
} else {
|
|
snd_printdd("%i\n", urb->start_frame);
|
|
if (!u)
|
|
usx2y->wait_iso_frame = urb->start_frame;
|
|
}
|
|
urb->transfer_flags = 0;
|
|
} else {
|
|
atomic_set(&subs->state, STATE_STARTING1);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
err = 0;
|
|
wait_event(usx2y->prepare_wait_queue, !usx2y->prepare_subs);
|
|
if (atomic_read(&subs->state) != STATE_PREPARED)
|
|
err = -EPIPE;
|
|
|
|
cleanup:
|
|
if (err) {
|
|
usx2y_subs_startup_finish(usx2y); // Call it now
|
|
usx2y_clients_stop(usx2y); // something is completely wrong > stop everything
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#define USX2Y_HWDEP_PCM_PAGES \
|
|
PAGE_ALIGN(sizeof(struct snd_usx2y_hwdep_pcm_shm))
|
|
|
|
/*
|
|
* prepare callback
|
|
*
|
|
* set format and initialize urbs
|
|
*/
|
|
static int snd_usx2y_usbpcm_prepare(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct snd_usx2y_substream *subs = runtime->private_data;
|
|
struct usx2ydev *usx2y = subs->usx2y;
|
|
struct snd_usx2y_substream *capsubs = subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE];
|
|
int err = 0;
|
|
|
|
snd_printdd("snd_usx2y_pcm_prepare(%p)\n", substream);
|
|
|
|
mutex_lock(&usx2y->pcm_mutex);
|
|
|
|
if (!usx2y->hwdep_pcm_shm) {
|
|
usx2y->hwdep_pcm_shm = alloc_pages_exact(USX2Y_HWDEP_PCM_PAGES,
|
|
GFP_KERNEL);
|
|
if (!usx2y->hwdep_pcm_shm) {
|
|
err = -ENOMEM;
|
|
goto up_prepare_mutex;
|
|
}
|
|
memset(usx2y->hwdep_pcm_shm, 0, USX2Y_HWDEP_PCM_PAGES);
|
|
}
|
|
|
|
usx2y_subs_prepare(subs);
|
|
// Start hardware streams
|
|
// SyncStream first....
|
|
if (atomic_read(&capsubs->state) < STATE_PREPARED) {
|
|
if (usx2y->format != runtime->format) {
|
|
err = usx2y_format_set(usx2y, runtime->format);
|
|
if (err < 0)
|
|
goto up_prepare_mutex;
|
|
}
|
|
if (usx2y->rate != runtime->rate) {
|
|
err = usx2y_rate_set(usx2y, runtime->rate);
|
|
if (err < 0)
|
|
goto up_prepare_mutex;
|
|
}
|
|
snd_printdd("starting capture pipe for %s\n", subs == capsubs ?
|
|
"self" : "playpipe");
|
|
err = usx2y_usbpcm_urbs_start(capsubs);
|
|
if (err < 0)
|
|
goto up_prepare_mutex;
|
|
}
|
|
|
|
if (subs != capsubs) {
|
|
usx2y->hwdep_pcm_shm->playback_iso_start = -1;
|
|
if (atomic_read(&subs->state) < STATE_PREPARED) {
|
|
while (usx2y_iso_frames_per_buffer(runtime, usx2y) >
|
|
usx2y->hwdep_pcm_shm->captured_iso_frames) {
|
|
snd_printdd("Wait: iso_frames_per_buffer=%i,captured_iso_frames=%i\n",
|
|
usx2y_iso_frames_per_buffer(runtime, usx2y),
|
|
usx2y->hwdep_pcm_shm->captured_iso_frames);
|
|
if (msleep_interruptible(10)) {
|
|
err = -ERESTARTSYS;
|
|
goto up_prepare_mutex;
|
|
}
|
|
}
|
|
err = usx2y_usbpcm_urbs_start(subs);
|
|
if (err < 0)
|
|
goto up_prepare_mutex;
|
|
}
|
|
snd_printdd("Ready: iso_frames_per_buffer=%i,captured_iso_frames=%i\n",
|
|
usx2y_iso_frames_per_buffer(runtime, usx2y),
|
|
usx2y->hwdep_pcm_shm->captured_iso_frames);
|
|
} else {
|
|
usx2y->hwdep_pcm_shm->capture_iso_start = -1;
|
|
}
|
|
|
|
up_prepare_mutex:
|
|
mutex_unlock(&usx2y->pcm_mutex);
|
|
return err;
|
|
}
|
|
|
|
static const struct snd_pcm_hardware snd_usx2y_4c = {
|
|
.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
|
|
SNDRV_PCM_INFO_BLOCK_TRANSFER |
|
|
SNDRV_PCM_INFO_MMAP_VALID),
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE,
|
|
.rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
|
|
.rate_min = 44100,
|
|
.rate_max = 48000,
|
|
.channels_min = 2,
|
|
.channels_max = 4,
|
|
.buffer_bytes_max = (2*128*1024),
|
|
.period_bytes_min = 64,
|
|
.period_bytes_max = (128*1024),
|
|
.periods_min = 2,
|
|
.periods_max = 1024,
|
|
.fifo_size = 0
|
|
};
|
|
|
|
static int snd_usx2y_usbpcm_open(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_usx2y_substream *subs =
|
|
((struct snd_usx2y_substream **)
|
|
snd_pcm_substream_chip(substream))[substream->stream];
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
if (!(subs->usx2y->chip_status & USX2Y_STAT_CHIP_MMAP_PCM_URBS))
|
|
return -EBUSY;
|
|
|
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
|
runtime->hw = snd_usx2y_2c;
|
|
else
|
|
runtime->hw = (subs->usx2y->subs[3] ? snd_usx2y_4c : snd_usx2y_2c);
|
|
runtime->private_data = subs;
|
|
subs->pcm_substream = substream;
|
|
snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1000, 200000);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_usx2y_usbpcm_close(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct snd_usx2y_substream *subs = runtime->private_data;
|
|
|
|
subs->pcm_substream = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static const struct snd_pcm_ops snd_usx2y_usbpcm_ops = {
|
|
.open = snd_usx2y_usbpcm_open,
|
|
.close = snd_usx2y_usbpcm_close,
|
|
.hw_params = snd_usx2y_pcm_hw_params,
|
|
.hw_free = snd_usx2y_usbpcm_hw_free,
|
|
.prepare = snd_usx2y_usbpcm_prepare,
|
|
.trigger = snd_usx2y_pcm_trigger,
|
|
.pointer = snd_usx2y_pcm_pointer,
|
|
};
|
|
|
|
static int usx2y_pcms_busy_check(struct snd_card *card)
|
|
{
|
|
struct usx2ydev *dev = usx2y(card);
|
|
struct snd_usx2y_substream *subs;
|
|
int i;
|
|
|
|
for (i = 0; i < dev->pcm_devs * 2; i++) {
|
|
subs = dev->subs[i];
|
|
if (subs && subs->pcm_substream &&
|
|
SUBSTREAM_BUSY(subs->pcm_substream))
|
|
return -EBUSY;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int snd_usx2y_hwdep_pcm_open(struct snd_hwdep *hw, struct file *file)
|
|
{
|
|
struct snd_card *card = hw->card;
|
|
int err;
|
|
|
|
mutex_lock(&usx2y(card)->pcm_mutex);
|
|
err = usx2y_pcms_busy_check(card);
|
|
if (!err)
|
|
usx2y(card)->chip_status |= USX2Y_STAT_CHIP_MMAP_PCM_URBS;
|
|
mutex_unlock(&usx2y(card)->pcm_mutex);
|
|
return err;
|
|
}
|
|
|
|
static int snd_usx2y_hwdep_pcm_release(struct snd_hwdep *hw, struct file *file)
|
|
{
|
|
struct snd_card *card = hw->card;
|
|
int err;
|
|
|
|
mutex_lock(&usx2y(card)->pcm_mutex);
|
|
err = usx2y_pcms_busy_check(card);
|
|
if (!err)
|
|
usx2y(hw->card)->chip_status &= ~USX2Y_STAT_CHIP_MMAP_PCM_URBS;
|
|
mutex_unlock(&usx2y(card)->pcm_mutex);
|
|
return err;
|
|
}
|
|
|
|
static void snd_usx2y_hwdep_pcm_vm_open(struct vm_area_struct *area)
|
|
{
|
|
}
|
|
|
|
static void snd_usx2y_hwdep_pcm_vm_close(struct vm_area_struct *area)
|
|
{
|
|
}
|
|
|
|
static vm_fault_t snd_usx2y_hwdep_pcm_vm_fault(struct vm_fault *vmf)
|
|
{
|
|
unsigned long offset;
|
|
void *vaddr;
|
|
|
|
offset = vmf->pgoff << PAGE_SHIFT;
|
|
vaddr = (char *)((struct usx2ydev *)vmf->vma->vm_private_data)->hwdep_pcm_shm + offset;
|
|
vmf->page = virt_to_page(vaddr);
|
|
get_page(vmf->page);
|
|
return 0;
|
|
}
|
|
|
|
static const struct vm_operations_struct snd_usx2y_hwdep_pcm_vm_ops = {
|
|
.open = snd_usx2y_hwdep_pcm_vm_open,
|
|
.close = snd_usx2y_hwdep_pcm_vm_close,
|
|
.fault = snd_usx2y_hwdep_pcm_vm_fault,
|
|
};
|
|
|
|
static int snd_usx2y_hwdep_pcm_mmap(struct snd_hwdep *hw, struct file *filp, struct vm_area_struct *area)
|
|
{
|
|
unsigned long size = (unsigned long)(area->vm_end - area->vm_start);
|
|
struct usx2ydev *usx2y = hw->private_data;
|
|
|
|
if (!(usx2y->chip_status & USX2Y_STAT_CHIP_INIT))
|
|
return -EBUSY;
|
|
|
|
/* if userspace tries to mmap beyond end of our buffer, fail */
|
|
if (size > USX2Y_HWDEP_PCM_PAGES) {
|
|
snd_printd("%lu > %lu\n", size, (unsigned long)USX2Y_HWDEP_PCM_PAGES);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!usx2y->hwdep_pcm_shm)
|
|
return -ENODEV;
|
|
|
|
area->vm_ops = &snd_usx2y_hwdep_pcm_vm_ops;
|
|
area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
|
|
area->vm_private_data = hw->private_data;
|
|
return 0;
|
|
}
|
|
|
|
static void snd_usx2y_hwdep_pcm_private_free(struct snd_hwdep *hwdep)
|
|
{
|
|
struct usx2ydev *usx2y = hwdep->private_data;
|
|
|
|
if (usx2y->hwdep_pcm_shm)
|
|
free_pages_exact(usx2y->hwdep_pcm_shm, USX2Y_HWDEP_PCM_PAGES);
|
|
}
|
|
|
|
int usx2y_hwdep_pcm_new(struct snd_card *card)
|
|
{
|
|
int err;
|
|
struct snd_hwdep *hw;
|
|
struct snd_pcm *pcm;
|
|
struct usb_device *dev = usx2y(card)->dev;
|
|
|
|
if (nr_of_packs() != 1)
|
|
return 0;
|
|
|
|
err = snd_hwdep_new(card, SND_USX2Y_USBPCM_ID, 1, &hw);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
hw->iface = SNDRV_HWDEP_IFACE_USX2Y_PCM;
|
|
hw->private_data = usx2y(card);
|
|
hw->private_free = snd_usx2y_hwdep_pcm_private_free;
|
|
hw->ops.open = snd_usx2y_hwdep_pcm_open;
|
|
hw->ops.release = snd_usx2y_hwdep_pcm_release;
|
|
hw->ops.mmap = snd_usx2y_hwdep_pcm_mmap;
|
|
hw->exclusive = 1;
|
|
sprintf(hw->name, "/dev/bus/usb/%03d/%03d/hwdeppcm", dev->bus->busnum, dev->devnum);
|
|
|
|
err = snd_pcm_new(card, NAME_ALLCAPS" hwdep Audio", 2, 1, 1, &pcm);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_usx2y_usbpcm_ops);
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usx2y_usbpcm_ops);
|
|
|
|
pcm->private_data = usx2y(card)->subs;
|
|
pcm->info_flags = 0;
|
|
|
|
sprintf(pcm->name, NAME_ALLCAPS" hwdep Audio");
|
|
snd_pcm_set_managed_buffer(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
|
|
SNDRV_DMA_TYPE_CONTINUOUS,
|
|
NULL,
|
|
64*1024, 128*1024);
|
|
snd_pcm_set_managed_buffer(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
|
|
SNDRV_DMA_TYPE_CONTINUOUS,
|
|
NULL,
|
|
64*1024, 128*1024);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
int usx2y_hwdep_pcm_new(struct snd_card *card)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif
|