--- /dev/null
+/*
+ * Line6 Linux USB driver - 0.8.0
+ *
+ * Copyright (C) 2004-2009 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 "driver.h"
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "audio.h"
+#include "pcm.h"
+#include "pod.h"
+#include "capture.h"
+
+
+/*
+ Find a free URB and submit it.
+*/
+static int submit_audio_in_urb(struct snd_pcm_substream *substream)
+{
+ int index;
+ unsigned long flags;
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+ int i, urb_size;
+ struct urb *urb_in;
+
+ spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
+ index = find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
+
+ if (index < 0 || index >= LINE6_ISO_BUFFERS) {
+ spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
+ dev_err(s2m(substream), "no free URB found\n");
+ return -EINVAL;
+ }
+
+ urb_in = line6pcm->urb_audio_in[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->buffer_in + index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
+ urb_in->transfer_buffer_length = urb_size;
+ urb_in->context = substream;
+
+ if (usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
+ set_bit(index, &line6pcm->active_urb_in);
+ else
+ dev_err(s2m(substream), "URB in #%d submission failed\n", index);
+
+ spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
+ return 0;
+}
+
+/*
+ Submit all currently available capture URBs.
+*/
+static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
+{
+ int ret, i;
+
+ for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
+ ret = submit_audio_in_urb(substream);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ Unlink all currently active capture URBs.
+*/
+static void unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
+{
+ unsigned int i;
+
+ for (i = LINE6_ISO_BUFFERS; i--;) {
+ if (test_bit(i, &line6pcm->active_urb_in)) {
+ if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
+ struct urb *u = line6pcm->urb_audio_in[i];
+ usb_unlink_urb(u);
+ }
+ }
+ }
+}
+
+/*
+ Wait until unlinking of all currently active capture URBs has been
+ finished.
+*/
+static void wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
+{
+ int timeout = HZ;
+ unsigned int i;
+ int alive;
+
+ do {
+ alive = 0;
+ for (i = LINE6_ISO_BUFFERS; i--;) {
+ if (test_bit(i, &line6pcm->active_urb_in))
+ alive++;
+ }
+ if (!alive)
+ break;
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(1);
+ } while (--timeout > 0);
+ if (alive)
+ snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
+
+ line6pcm->active_urb_in = 0;
+ line6pcm->unlink_urb_in = 0;
+}
+
+/*
+ Unlink all currently active capture URBs, and wait for finishing.
+*/
+void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
+{
+ unlink_audio_in_urbs(line6pcm);
+ wait_clear_audio_in_urbs(line6pcm);
+}
+
+/*
+ Callback for completed capture URB.
+*/
+static void audio_in_callback(struct urb *urb)
+{
+ int i, index, length = 0, shutdown = 0;
+ int frames;
+ unsigned long flags;
+
+ struct snd_pcm_substream *substream = (struct snd_pcm_substream *)urb->context;
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+ const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ /* find index of URB */
+ for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
+ if (urb == line6pcm->urb_audio_in[index])
+ break;
+
+#if DO_DUMP_PCM_RECEIVE
+ for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
+ struct usb_iso_packet_descriptor *fout = &urb->iso_frame_desc[i];
+ line6_write_hexdump(line6pcm->line6, 'C', urb->transfer_buffer + fout->offset, fout->length);
+ }
+#endif
+
+ spin_lock_irqsave(&line6pcm->lock_audio_in, 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 == -18) {
+ shutdown = 1;
+ break;
+ }
+
+ fbuf = urb->transfer_buffer + fin->offset;
+ fsize = fin->actual_length;
+ length += fsize;
+
+ if (fsize > 0) {
+ frames = fsize / bytes_per_frame;
+
+ if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
+ /*
+ The transferred area goes over buffer boundary,
+ copy two separate chunks.
+ */
+ int len;
+ len = runtime->buffer_size - line6pcm->pos_in_done;
+
+ if (len > 0) {
+ memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, len * bytes_per_frame);
+ memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, (frames - len) * bytes_per_frame);
+ } else
+ dev_err(s2m(substream), "driver bug: len = %d\n", len); /* this is somewhat paranoid */
+ } else {
+ /* copy single chunk */
+ memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize * bytes_per_frame);
+ }
+
+ if ((line6pcm->pos_in_done += frames) >= runtime->buffer_size)
+ line6pcm->pos_in_done -= runtime->buffer_size;
+ }
+ }
+
+ clear_bit(index, &line6pcm->active_urb_in);
+
+ if (test_bit(index, &line6pcm->unlink_urb_in))
+ shutdown = 1;
+
+ spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
+
+ if (!shutdown) {
+ submit_audio_in_urb(substream);
+
+ if ((line6pcm->bytes_in += length) >= line6pcm->period_in) {
+ line6pcm->bytes_in -= line6pcm->period_in;
+ snd_pcm_period_elapsed(substream);
+ }
+ }
+}
+
+/* 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->snd_line6_rates));
+ if (err < 0)
+ return err;
+
+ runtime->hw = line6pcm->properties->snd_line6_capture_hw;
+ return 0;
+}
+
+/* close capture callback */
+static int snd_line6_capture_close(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+/* hw_params capture callback */
+static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ int ret;
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+ /* -- Florian Demski [FD] */
+ /* don't ask me why, but this fixes the bug on my machine */
+ if (line6pcm == NULL) {
+ if (substream->pcm == NULL)
+ return -ENOMEM;
+ if (substream->pcm->private_data == NULL)
+ return -ENOMEM;
+ substream->private_data = substream->pcm->private_data;
+ line6pcm = snd_pcm_substream_chip(substream);
+ }
+ /* -- [FD] end */
+
+ ret = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+ if (ret < 0)
+ return ret;
+
+ line6pcm->period_in = params_period_bytes(hw_params);
+ line6pcm->buffer_in = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
+
+ if (!line6pcm->buffer_in) {
+ dev_err(s2m(substream), "cannot malloc buffer_in\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/* hw_free capture callback */
+static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+ unlink_wait_clear_audio_in_urbs(line6pcm);
+
+ kfree(line6pcm->buffer_in);
+ line6pcm->buffer_in = NULL;
+
+ return snd_pcm_lib_free_pages(substream);
+}
+
+/* trigger callback */
+int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+ int err;
+ line6pcm->count_in = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ if (!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
+ err = submit_audio_in_all_urbs(substream);
+
+ if (err < 0) {
+ clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags);
+ return err;
+ }
+ }
+
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ if (test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
+ unlink_audio_in_urbs(line6pcm);
+
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* capture pointer callback */
+static snd_pcm_uframes_t
+snd_line6_capture_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+ return line6pcm->pos_in_done;
+}
+
+/* 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_capture_hw_params,
+ .hw_free = snd_line6_capture_hw_free,
+ .prepare = snd_line6_prepare,
+ .trigger = snd_line6_trigger,
+ .pointer = snd_line6_capture_pointer,
+};
+
+int create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
+{
+ 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->urb_audio_in[i] = usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
+
+ if (urb == NULL) {
+ dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
+ return -ENOMEM;
+ }
+
+ urb->dev = line6pcm->line6->usbdev;
+ urb->pipe = usb_rcvisocpipe(line6pcm->line6->usbdev, line6pcm->ep_audio_read & 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;
+}
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