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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Linux driver for TerraTec DMX 6Fire USB4 *5 * Rawmidi driver6 *7 * Author: Torsten Schenk <torsten.schenk@zoho.com>8 * Created: Jan 01, 20119 * Copyright: (C) Torsten Schenk10 */11 12#include <sound/rawmidi.h>13 14#include "midi.h"15#include "chip.h"16#include "comm.h"17 18enum {19 MIDI_BUFSIZE = 6420};21 22static void usb6fire_midi_out_handler(struct urb *urb)23{24 struct midi_runtime *rt = urb->context;25 int ret;26 unsigned long flags;27 28 spin_lock_irqsave(&rt->out_lock, flags);29 30 if (rt->out) {31 ret = snd_rawmidi_transmit(rt->out, rt->out_buffer + 4,32 MIDI_BUFSIZE - 4);33 if (ret > 0) { /* more data available, send next packet */34 rt->out_buffer[1] = ret + 2;35 rt->out_buffer[3] = rt->out_serial++;36 urb->transfer_buffer_length = ret + 4;37 38 ret = usb_submit_urb(urb, GFP_ATOMIC);39 if (ret < 0)40 dev_err(&urb->dev->dev,41 "midi out urb submit failed: %d\n",42 ret);43 } else /* no more data to transmit */44 rt->out = NULL;45 }46 spin_unlock_irqrestore(&rt->out_lock, flags);47}48 49static void usb6fire_midi_in_received(50 struct midi_runtime *rt, u8 *data, int length)51{52 unsigned long flags;53 54 spin_lock_irqsave(&rt->in_lock, flags);55 if (rt->in)56 snd_rawmidi_receive(rt->in, data, length);57 spin_unlock_irqrestore(&rt->in_lock, flags);58}59 60static int usb6fire_midi_out_open(struct snd_rawmidi_substream *alsa_sub)61{62 return 0;63}64 65static int usb6fire_midi_out_close(struct snd_rawmidi_substream *alsa_sub)66{67 return 0;68}69 70static void usb6fire_midi_out_trigger(71 struct snd_rawmidi_substream *alsa_sub, int up)72{73 struct midi_runtime *rt = alsa_sub->rmidi->private_data;74 struct urb *urb = &rt->out_urb;75 __s8 ret;76 unsigned long flags;77 78 spin_lock_irqsave(&rt->out_lock, flags);79 if (up) { /* start transfer */80 if (rt->out) { /* we are already transmitting so just return */81 spin_unlock_irqrestore(&rt->out_lock, flags);82 return;83 }84 85 ret = snd_rawmidi_transmit(alsa_sub, rt->out_buffer + 4,86 MIDI_BUFSIZE - 4);87 if (ret > 0) {88 rt->out_buffer[1] = ret + 2;89 rt->out_buffer[3] = rt->out_serial++;90 urb->transfer_buffer_length = ret + 4;91 92 ret = usb_submit_urb(urb, GFP_ATOMIC);93 if (ret < 0)94 dev_err(&urb->dev->dev,95 "midi out urb submit failed: %d\n",96 ret);97 else98 rt->out = alsa_sub;99 }100 } else if (rt->out == alsa_sub)101 rt->out = NULL;102 spin_unlock_irqrestore(&rt->out_lock, flags);103}104 105static void usb6fire_midi_out_drain(struct snd_rawmidi_substream *alsa_sub)106{107 struct midi_runtime *rt = alsa_sub->rmidi->private_data;108 int retry = 0;109 110 while (rt->out && retry++ < 100)111 msleep(10);112}113 114static int usb6fire_midi_in_open(struct snd_rawmidi_substream *alsa_sub)115{116 return 0;117}118 119static int usb6fire_midi_in_close(struct snd_rawmidi_substream *alsa_sub)120{121 return 0;122}123 124static void usb6fire_midi_in_trigger(125 struct snd_rawmidi_substream *alsa_sub, int up)126{127 struct midi_runtime *rt = alsa_sub->rmidi->private_data;128 unsigned long flags;129 130 spin_lock_irqsave(&rt->in_lock, flags);131 if (up)132 rt->in = alsa_sub;133 else134 rt->in = NULL;135 spin_unlock_irqrestore(&rt->in_lock, flags);136}137 138static const struct snd_rawmidi_ops out_ops = {139 .open = usb6fire_midi_out_open,140 .close = usb6fire_midi_out_close,141 .trigger = usb6fire_midi_out_trigger,142 .drain = usb6fire_midi_out_drain143};144 145static const struct snd_rawmidi_ops in_ops = {146 .open = usb6fire_midi_in_open,147 .close = usb6fire_midi_in_close,148 .trigger = usb6fire_midi_in_trigger149};150 151int usb6fire_midi_init(struct sfire_chip *chip)152{153 int ret;154 struct midi_runtime *rt = kzalloc(sizeof(struct midi_runtime),155 GFP_KERNEL);156 struct comm_runtime *comm_rt = chip->comm;157 158 if (!rt)159 return -ENOMEM;160 161 rt->out_buffer = kzalloc(MIDI_BUFSIZE, GFP_KERNEL);162 if (!rt->out_buffer) {163 kfree(rt);164 return -ENOMEM;165 }166 167 rt->chip = chip;168 rt->in_received = usb6fire_midi_in_received;169 rt->out_buffer[0] = 0x80; /* 'send midi' command */170 rt->out_buffer[1] = 0x00; /* size of data */171 rt->out_buffer[2] = 0x00; /* always 0 */172 spin_lock_init(&rt->in_lock);173 spin_lock_init(&rt->out_lock);174 175 comm_rt->init_urb(comm_rt, &rt->out_urb, rt->out_buffer, rt,176 usb6fire_midi_out_handler);177 178 ret = snd_rawmidi_new(chip->card, "6FireUSB", 0, 1, 1, &rt->instance);179 if (ret < 0) {180 kfree(rt->out_buffer);181 kfree(rt);182 dev_err(&chip->dev->dev, "unable to create midi.\n");183 return ret;184 }185 rt->instance->private_data = rt;186 strcpy(rt->instance->name, "DMX6FireUSB MIDI");187 rt->instance->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |188 SNDRV_RAWMIDI_INFO_INPUT |189 SNDRV_RAWMIDI_INFO_DUPLEX;190 snd_rawmidi_set_ops(rt->instance, SNDRV_RAWMIDI_STREAM_OUTPUT,191 &out_ops);192 snd_rawmidi_set_ops(rt->instance, SNDRV_RAWMIDI_STREAM_INPUT,193 &in_ops);194 195 chip->midi = rt;196 return 0;197}198 199void usb6fire_midi_abort(struct sfire_chip *chip)200{201 struct midi_runtime *rt = chip->midi;202 203 if (rt)204 usb_poison_urb(&rt->out_urb);205}206 207void usb6fire_midi_destroy(struct sfire_chip *chip)208{209 struct midi_runtime *rt = chip->midi;210 211 kfree(rt->out_buffer);212 kfree(rt);213 chip->midi = NULL;214}215