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293 lines
6.7 KiB
293 lines
6.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Line 6 Linux USB driver |
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* |
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* Copyright (C) 2004-2010 Markus Grabner ([email protected]) |
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*/ |
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#include <linux/slab.h> |
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#include <linux/usb.h> |
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#include <linux/export.h> |
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#include <sound/core.h> |
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#include <sound/rawmidi.h> |
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#include "driver.h" |
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#include "midi.h" |
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#define line6_rawmidi_substream_midi(substream) \ |
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((struct snd_line6_midi *)((substream)->rmidi->private_data)) |
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static int send_midi_async(struct usb_line6 *line6, unsigned char *data, |
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int length); |
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/* |
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Pass data received via USB to MIDI. |
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*/ |
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void line6_midi_receive(struct usb_line6 *line6, unsigned char *data, |
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int length) |
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{ |
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if (line6->line6midi->substream_receive) |
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snd_rawmidi_receive(line6->line6midi->substream_receive, |
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data, length); |
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} |
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/* |
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Read data from MIDI buffer and transmit them via USB. |
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*/ |
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static void line6_midi_transmit(struct snd_rawmidi_substream *substream) |
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{ |
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struct usb_line6 *line6 = |
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line6_rawmidi_substream_midi(substream)->line6; |
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struct snd_line6_midi *line6midi = line6->line6midi; |
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struct midi_buffer *mb = &line6midi->midibuf_out; |
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unsigned char chunk[LINE6_FALLBACK_MAXPACKETSIZE]; |
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int req, done; |
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for (;;) { |
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req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size); |
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done = snd_rawmidi_transmit_peek(substream, chunk, req); |
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if (done == 0) |
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break; |
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line6_midibuf_write(mb, chunk, done); |
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snd_rawmidi_transmit_ack(substream, done); |
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} |
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for (;;) { |
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done = line6_midibuf_read(mb, chunk, |
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LINE6_FALLBACK_MAXPACKETSIZE); |
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if (done == 0) |
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break; |
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send_midi_async(line6, chunk, done); |
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} |
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} |
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/* |
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Notification of completion of MIDI transmission. |
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*/ |
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static void midi_sent(struct urb *urb) |
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{ |
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unsigned long flags; |
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int status; |
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int num; |
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struct usb_line6 *line6 = (struct usb_line6 *)urb->context; |
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status = urb->status; |
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kfree(urb->transfer_buffer); |
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usb_free_urb(urb); |
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if (status == -ESHUTDOWN) |
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return; |
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spin_lock_irqsave(&line6->line6midi->lock, flags); |
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num = --line6->line6midi->num_active_send_urbs; |
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if (num == 0) { |
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line6_midi_transmit(line6->line6midi->substream_transmit); |
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num = line6->line6midi->num_active_send_urbs; |
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} |
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if (num == 0) |
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wake_up(&line6->line6midi->send_wait); |
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spin_unlock_irqrestore(&line6->line6midi->lock, flags); |
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} |
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/* |
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Send an asynchronous MIDI message. |
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Assumes that line6->line6midi->lock is held |
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(i.e., this function is serialized). |
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*/ |
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static int send_midi_async(struct usb_line6 *line6, unsigned char *data, |
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int length) |
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{ |
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struct urb *urb; |
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int retval; |
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unsigned char *transfer_buffer; |
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urb = usb_alloc_urb(0, GFP_ATOMIC); |
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if (urb == NULL) |
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return -ENOMEM; |
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transfer_buffer = kmemdup(data, length, GFP_ATOMIC); |
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if (transfer_buffer == NULL) { |
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usb_free_urb(urb); |
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return -ENOMEM; |
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} |
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usb_fill_int_urb(urb, line6->usbdev, |
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usb_sndintpipe(line6->usbdev, |
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line6->properties->ep_ctrl_w), |
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transfer_buffer, length, midi_sent, line6, |
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line6->interval); |
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urb->actual_length = 0; |
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retval = usb_urb_ep_type_check(urb); |
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if (retval < 0) |
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goto error; |
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retval = usb_submit_urb(urb, GFP_ATOMIC); |
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if (retval < 0) |
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goto error; |
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++line6->line6midi->num_active_send_urbs; |
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return 0; |
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error: |
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dev_err(line6->ifcdev, "usb_submit_urb failed\n"); |
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usb_free_urb(urb); |
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return retval; |
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} |
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static int line6_midi_output_open(struct snd_rawmidi_substream *substream) |
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{ |
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return 0; |
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} |
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static int line6_midi_output_close(struct snd_rawmidi_substream *substream) |
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{ |
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return 0; |
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} |
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static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream, |
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int up) |
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{ |
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unsigned long flags; |
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struct usb_line6 *line6 = |
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line6_rawmidi_substream_midi(substream)->line6; |
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line6->line6midi->substream_transmit = substream; |
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spin_lock_irqsave(&line6->line6midi->lock, flags); |
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if (line6->line6midi->num_active_send_urbs == 0) |
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line6_midi_transmit(substream); |
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spin_unlock_irqrestore(&line6->line6midi->lock, flags); |
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} |
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static void line6_midi_output_drain(struct snd_rawmidi_substream *substream) |
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{ |
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struct usb_line6 *line6 = |
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line6_rawmidi_substream_midi(substream)->line6; |
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struct snd_line6_midi *midi = line6->line6midi; |
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wait_event_interruptible(midi->send_wait, |
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midi->num_active_send_urbs == 0); |
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} |
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static int line6_midi_input_open(struct snd_rawmidi_substream *substream) |
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{ |
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return 0; |
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} |
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static int line6_midi_input_close(struct snd_rawmidi_substream *substream) |
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{ |
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return 0; |
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} |
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static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream, |
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int up) |
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{ |
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struct usb_line6 *line6 = |
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line6_rawmidi_substream_midi(substream)->line6; |
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if (up) |
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line6->line6midi->substream_receive = substream; |
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else |
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line6->line6midi->substream_receive = NULL; |
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} |
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static const struct snd_rawmidi_ops line6_midi_output_ops = { |
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.open = line6_midi_output_open, |
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.close = line6_midi_output_close, |
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.trigger = line6_midi_output_trigger, |
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.drain = line6_midi_output_drain, |
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}; |
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static const struct snd_rawmidi_ops line6_midi_input_ops = { |
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.open = line6_midi_input_open, |
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.close = line6_midi_input_close, |
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.trigger = line6_midi_input_trigger, |
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}; |
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/* Create a MIDI device */ |
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static int snd_line6_new_midi(struct usb_line6 *line6, |
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struct snd_rawmidi **rmidi_ret) |
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{ |
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struct snd_rawmidi *rmidi; |
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int err; |
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err = snd_rawmidi_new(line6->card, "Line 6 MIDI", 0, 1, 1, rmidi_ret); |
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if (err < 0) |
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return err; |
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rmidi = *rmidi_ret; |
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strcpy(rmidi->id, line6->properties->id); |
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strcpy(rmidi->name, line6->properties->name); |
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rmidi->info_flags = |
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SNDRV_RAWMIDI_INFO_OUTPUT | |
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SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX; |
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, |
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&line6_midi_output_ops); |
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, |
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&line6_midi_input_ops); |
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return 0; |
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} |
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/* MIDI device destructor */ |
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static void snd_line6_midi_free(struct snd_rawmidi *rmidi) |
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{ |
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struct snd_line6_midi *line6midi = rmidi->private_data; |
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line6_midibuf_destroy(&line6midi->midibuf_in); |
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line6_midibuf_destroy(&line6midi->midibuf_out); |
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kfree(line6midi); |
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} |
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/* |
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Initialize the Line 6 MIDI subsystem. |
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*/ |
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int line6_init_midi(struct usb_line6 *line6) |
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{ |
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int err; |
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struct snd_rawmidi *rmidi; |
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struct snd_line6_midi *line6midi; |
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if (!(line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI)) { |
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/* skip MIDI initialization and report success */ |
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return 0; |
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} |
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err = snd_line6_new_midi(line6, &rmidi); |
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if (err < 0) |
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return err; |
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line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL); |
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if (!line6midi) |
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return -ENOMEM; |
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rmidi->private_data = line6midi; |
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rmidi->private_free = snd_line6_midi_free; |
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init_waitqueue_head(&line6midi->send_wait); |
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spin_lock_init(&line6midi->lock); |
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line6midi->line6 = line6; |
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err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0); |
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if (err < 0) |
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return err; |
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err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1); |
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if (err < 0) |
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return err; |
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line6->line6midi = line6midi; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(line6_init_midi);
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