diff options
Diffstat (limited to 'sound/usb/caiaq/midi.c')
| -rw-r--r-- | sound/usb/caiaq/midi.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/sound/usb/caiaq/midi.c b/sound/usb/caiaq/midi.c new file mode 100644 index 0000000000..c656d01624 --- /dev/null +++ b/sound/usb/caiaq/midi.c @@ -0,0 +1,162 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2006,2007 Daniel Mack +*/ + +#include <linux/device.h> +#include <linux/usb.h> +#include <linux/gfp.h> +#include <sound/rawmidi.h> +#include <sound/core.h> +#include <sound/pcm.h> + +#include "device.h" +#include "midi.h" + +static int snd_usb_caiaq_midi_input_open(struct snd_rawmidi_substream *substream) +{ + return 0; +} + +static int snd_usb_caiaq_midi_input_close(struct snd_rawmidi_substream *substream) +{ + return 0; +} + +static void snd_usb_caiaq_midi_input_trigger(struct snd_rawmidi_substream *substream, int up) +{ + struct snd_usb_caiaqdev *cdev = substream->rmidi->private_data; + + if (!cdev) + return; + + cdev->midi_receive_substream = up ? substream : NULL; +} + + +static int snd_usb_caiaq_midi_output_open(struct snd_rawmidi_substream *substream) +{ + return 0; +} + +static int snd_usb_caiaq_midi_output_close(struct snd_rawmidi_substream *substream) +{ + struct snd_usb_caiaqdev *cdev = substream->rmidi->private_data; + if (cdev->midi_out_active) { + usb_kill_urb(&cdev->midi_out_urb); + cdev->midi_out_active = 0; + } + return 0; +} + +static void snd_usb_caiaq_midi_send(struct snd_usb_caiaqdev *cdev, + struct snd_rawmidi_substream *substream) +{ + int len, ret; + struct device *dev = caiaqdev_to_dev(cdev); + + cdev->midi_out_buf[0] = EP1_CMD_MIDI_WRITE; + cdev->midi_out_buf[1] = 0; /* port */ + len = snd_rawmidi_transmit(substream, cdev->midi_out_buf + 3, + EP1_BUFSIZE - 3); + + if (len <= 0) + return; + + cdev->midi_out_buf[2] = len; + cdev->midi_out_urb.transfer_buffer_length = len+3; + + ret = usb_submit_urb(&cdev->midi_out_urb, GFP_ATOMIC); + if (ret < 0) + dev_err(dev, + "snd_usb_caiaq_midi_send(%p): usb_submit_urb() failed," + "ret=%d, len=%d\n", substream, ret, len); + else + cdev->midi_out_active = 1; +} + +static void snd_usb_caiaq_midi_output_trigger(struct snd_rawmidi_substream *substream, int up) +{ + struct snd_usb_caiaqdev *cdev = substream->rmidi->private_data; + + if (up) { + cdev->midi_out_substream = substream; + if (!cdev->midi_out_active) + snd_usb_caiaq_midi_send(cdev, substream); + } else { + cdev->midi_out_substream = NULL; + } +} + + +static const struct snd_rawmidi_ops snd_usb_caiaq_midi_output = +{ + .open = snd_usb_caiaq_midi_output_open, + .close = snd_usb_caiaq_midi_output_close, + .trigger = snd_usb_caiaq_midi_output_trigger, +}; + +static const struct snd_rawmidi_ops snd_usb_caiaq_midi_input = +{ + .open = snd_usb_caiaq_midi_input_open, + .close = snd_usb_caiaq_midi_input_close, + .trigger = snd_usb_caiaq_midi_input_trigger, +}; + +void snd_usb_caiaq_midi_handle_input(struct snd_usb_caiaqdev *cdev, + int port, const char *buf, int len) +{ + if (!cdev->midi_receive_substream) + return; + + snd_rawmidi_receive(cdev->midi_receive_substream, buf, len); +} + +int snd_usb_caiaq_midi_init(struct snd_usb_caiaqdev *device) +{ + int ret; + struct snd_rawmidi *rmidi; + + ret = snd_rawmidi_new(device->chip.card, device->product_name, 0, + device->spec.num_midi_out, + device->spec.num_midi_in, + &rmidi); + + if (ret < 0) + return ret; + + strscpy(rmidi->name, device->product_name, sizeof(rmidi->name)); + + rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX; + rmidi->private_data = device; + + if (device->spec.num_midi_out > 0) { + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, + &snd_usb_caiaq_midi_output); + } + + if (device->spec.num_midi_in > 0) { + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, + &snd_usb_caiaq_midi_input); + } + + device->rmidi = rmidi; + + return 0; +} + +void snd_usb_caiaq_midi_output_done(struct urb* urb) +{ + struct snd_usb_caiaqdev *cdev = urb->context; + + cdev->midi_out_active = 0; + if (urb->status != 0) + return; + + if (!cdev->midi_out_substream) + return; + + snd_usb_caiaq_midi_send(cdev, cdev->midi_out_substream); +} |