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-rw-r--r--sound/usb/line6/capture.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/sound/usb/line6/capture.c b/sound/usb/line6/capture.c
new file mode 100644
index 000000000..970c9bdce
--- /dev/null
+++ b/sound/usb/line6/capture.c
@@ -0,0 +1,294 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Line 6 Linux USB driver
+ *
+ * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
+ */
+
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "capture.h"
+#include "driver.h"
+#include "pcm.h"
+
+/*
+ Find a free URB and submit it.
+ must be called in line6pcm->in.lock context
+*/
+static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
+{
+ int index;
+ int i, urb_size;
+ int ret;
+ struct urb *urb_in;
+
+ index = find_first_zero_bit(&line6pcm->in.active_urbs,
+ line6pcm->line6->iso_buffers);
+
+ if (index < 0 || index >= line6pcm->line6->iso_buffers) {
+ dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
+ return -EINVAL;
+ }
+
+ urb_in = line6pcm->in.urbs[index];
+ urb_size = 0;
+
+ for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
+ struct usb_iso_packet_descriptor *fin =
+ &urb_in->iso_frame_desc[i];
+ fin->offset = urb_size;
+ fin->length = line6pcm->max_packet_size_in;
+ urb_size += line6pcm->max_packet_size_in;
+ }
+
+ urb_in->transfer_buffer =
+ line6pcm->in.buffer +
+ index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_in;
+ urb_in->transfer_buffer_length = urb_size;
+ urb_in->context = line6pcm;
+
+ ret = usb_submit_urb(urb_in, GFP_ATOMIC);
+
+ if (ret == 0)
+ set_bit(index, &line6pcm->in.active_urbs);
+ else
+ dev_err(line6pcm->line6->ifcdev,
+ "URB in #%d submission failed (%d)\n", index, ret);
+
+ return 0;
+}
+
+/*
+ Submit all currently available capture URBs.
+ must be called in line6pcm->in.lock context
+*/
+int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
+{
+ int ret = 0, i;
+
+ for (i = 0; i < line6pcm->line6->iso_buffers; ++i) {
+ ret = submit_audio_in_urb(line6pcm);
+ if (ret < 0)
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ Copy data into ALSA capture buffer.
+*/
+void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
+{
+ struct snd_pcm_substream *substream =
+ get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ const int bytes_per_frame =
+ line6pcm->properties->bytes_per_channel *
+ line6pcm->properties->capture_hw.channels_max;
+ int frames = fsize / bytes_per_frame;
+
+ if (runtime == NULL)
+ return;
+
+ if (line6pcm->in.pos_done + frames > runtime->buffer_size) {
+ /*
+ The transferred area goes over buffer boundary,
+ copy two separate chunks.
+ */
+ int len;
+
+ len = runtime->buffer_size - line6pcm->in.pos_done;
+
+ if (len > 0) {
+ memcpy(runtime->dma_area +
+ line6pcm->in.pos_done * bytes_per_frame, fbuf,
+ len * bytes_per_frame);
+ memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
+ (frames - len) * bytes_per_frame);
+ } else {
+ /* this is somewhat paranoid */
+ dev_err(line6pcm->line6->ifcdev,
+ "driver bug: len = %d\n", len);
+ }
+ } else {
+ /* copy single chunk */
+ memcpy(runtime->dma_area +
+ line6pcm->in.pos_done * bytes_per_frame, fbuf, fsize);
+ }
+
+ line6pcm->in.pos_done += frames;
+ if (line6pcm->in.pos_done >= runtime->buffer_size)
+ line6pcm->in.pos_done -= runtime->buffer_size;
+}
+
+void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
+{
+ struct snd_pcm_substream *substream =
+ get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
+
+ line6pcm->in.bytes += length;
+ if (line6pcm->in.bytes >= line6pcm->in.period) {
+ line6pcm->in.bytes %= line6pcm->in.period;
+ spin_unlock(&line6pcm->in.lock);
+ snd_pcm_period_elapsed(substream);
+ spin_lock(&line6pcm->in.lock);
+ }
+}
+
+/*
+ * Callback for completed capture URB.
+ */
+static void audio_in_callback(struct urb *urb)
+{
+ int i, index, length = 0, shutdown = 0;
+ unsigned long flags;
+
+ struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
+
+ line6pcm->in.last_frame = urb->start_frame;
+
+ /* find index of URB */
+ for (index = 0; index < line6pcm->line6->iso_buffers; ++index)
+ if (urb == line6pcm->in.urbs[index])
+ break;
+
+ spin_lock_irqsave(&line6pcm->in.lock, flags);
+
+ for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
+ char *fbuf;
+ int fsize;
+ struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
+
+ if (fin->status == -EXDEV) {
+ shutdown = 1;
+ break;
+ }
+
+ fbuf = urb->transfer_buffer + fin->offset;
+ fsize = fin->actual_length;
+
+ if (fsize > line6pcm->max_packet_size_in) {
+ dev_err(line6pcm->line6->ifcdev,
+ "driver and/or device bug: packet too large (%d > %d)\n",
+ fsize, line6pcm->max_packet_size_in);
+ }
+
+ length += fsize;
+
+ BUILD_BUG_ON_MSG(LINE6_ISO_PACKETS != 1,
+ "The following code assumes LINE6_ISO_PACKETS == 1");
+ /* TODO:
+ * Also, if iso_buffers != 2, the prev frame is almost random at
+ * playback side.
+ * This needs to be redesigned. It should be "stable", but we may
+ * experience sync problems on such high-speed configs.
+ */
+
+ line6pcm->prev_fbuf = fbuf;
+ line6pcm->prev_fsize = fsize /
+ (line6pcm->properties->bytes_per_channel *
+ line6pcm->properties->capture_hw.channels_max);
+
+ if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
+ test_bit(LINE6_STREAM_PCM, &line6pcm->in.running) &&
+ fsize > 0)
+ line6_capture_copy(line6pcm, fbuf, fsize);
+ }
+
+ clear_bit(index, &line6pcm->in.active_urbs);
+
+ if (test_and_clear_bit(index, &line6pcm->in.unlink_urbs))
+ shutdown = 1;
+
+ if (!shutdown) {
+ submit_audio_in_urb(line6pcm);
+
+ if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
+ test_bit(LINE6_STREAM_PCM, &line6pcm->in.running))
+ line6_capture_check_period(line6pcm, length);
+ }
+
+ spin_unlock_irqrestore(&line6pcm->in.lock, flags);
+}
+
+/* open capture callback */
+static int snd_line6_capture_open(struct snd_pcm_substream *substream)
+{
+ int err;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+ err = snd_pcm_hw_constraint_ratdens(runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE,
+ &line6pcm->properties->rates);
+ if (err < 0)
+ return err;
+
+ line6_pcm_acquire(line6pcm, LINE6_STREAM_CAPTURE_HELPER, false);
+
+ runtime->hw = line6pcm->properties->capture_hw;
+ return 0;
+}
+
+/* close capture callback */
+static int snd_line6_capture_close(struct snd_pcm_substream *substream)
+{
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+ line6_pcm_release(line6pcm, LINE6_STREAM_CAPTURE_HELPER);
+ return 0;
+}
+
+/* capture operators */
+const struct snd_pcm_ops snd_line6_capture_ops = {
+ .open = snd_line6_capture_open,
+ .close = snd_line6_capture_close,
+ .hw_params = snd_line6_hw_params,
+ .hw_free = snd_line6_hw_free,
+ .prepare = snd_line6_prepare,
+ .trigger = snd_line6_trigger,
+ .pointer = snd_line6_pointer,
+};
+
+int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
+{
+ struct usb_line6 *line6 = line6pcm->line6;
+ int i;
+
+ line6pcm->in.urbs = kcalloc(line6->iso_buffers, sizeof(struct urb *),
+ GFP_KERNEL);
+ if (line6pcm->in.urbs == NULL)
+ return -ENOMEM;
+
+ /* create audio URBs and fill in constant values: */
+ for (i = 0; i < line6->iso_buffers; ++i) {
+ struct urb *urb;
+
+ /* URB for audio in: */
+ urb = line6pcm->in.urbs[i] =
+ usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
+
+ if (urb == NULL)
+ return -ENOMEM;
+
+ urb->dev = line6->usbdev;
+ urb->pipe =
+ usb_rcvisocpipe(line6->usbdev,
+ line6->properties->ep_audio_r &
+ USB_ENDPOINT_NUMBER_MASK);
+ urb->transfer_flags = URB_ISO_ASAP;
+ urb->start_frame = -1;
+ urb->number_of_packets = LINE6_ISO_PACKETS;
+ urb->interval = LINE6_ISO_INTERVAL;
+ urb->error_count = 0;
+ urb->complete = audio_in_callback;
+ if (usb_urb_ep_type_check(urb))
+ return -EINVAL;
+ }
+
+ return 0;
+}
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