Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / sound / usb / line6 / capture.c
diff --git a/kernel/sound/usb/line6/capture.c b/kernel/sound/usb/line6/capture.c
new file mode 100644 (file)
index 0000000..f518fbb
--- /dev/null
@@ -0,0 +1,275 @@
+/*
+ * Line 6 Linux USB driver
+ *
+ * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
+ *
+ *     This program is free software; you can redistribute it and/or
+ *     modify it under the terms of the GNU General Public License as
+ *     published by the Free Software Foundation, version 2.
+ *
+ */
+
+#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, LINE6_ISO_BUFFERS);
+
+       if (index < 0 || index >= 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;
+               urb_size += line6pcm->max_packet_size;
+       }
+
+       urb_in->transfer_buffer =
+           line6pcm->in.buffer +
+           index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
+       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 < 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_frame;
+       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 < 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) {
+                       dev_err(line6pcm->line6->ifcdev,
+                               "driver and/or device bug: packet too large (%d > %d)\n",
+                               fsize, line6pcm->max_packet_size);
+               }
+
+               length += fsize;
+
+               /* the following assumes LINE6_ISO_PACKETS == 1: */
+               line6pcm->prev_fbuf = fbuf;
+               line6pcm->prev_fsize = fsize;
+
+               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;
+
+       runtime->hw = line6pcm->properties->capture_hw;
+       return 0;
+}
+
+/* close capture callback */
+static int snd_line6_capture_close(struct snd_pcm_substream *substream)
+{
+       return 0;
+}
+
+/* capture operators */
+struct snd_pcm_ops snd_line6_capture_ops = {
+       .open = snd_line6_capture_open,
+       .close = snd_line6_capture_close,
+       .ioctl = snd_pcm_lib_ioctl,
+       .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;
+
+       /* 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;
+       }
+
+       return 0;
+}