1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * Routines for control of SoundBlaster cards - MIDI interface 5 * 6 * -- 7 * 8 * Sun May 9 22:54:38 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk> 9 * Fixed typo in snd_sb8dsp_midi_new_device which prevented midi from 10 * working. 11 * 12 * Sun May 11 12:34:56 UTC 2003 Clemens Ladisch <clemens@ladisch.de> 13 * Added full duplex UART mode for DSP version 2.0 and later. 14 */ 15 16 #include <linux/io.h> 17 #include <linux/string.h> 18 #include <linux/time.h> 19 #include <sound/core.h> 20 #include <sound/sb.h> 21 22 23 irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip) 24 { 25 struct snd_rawmidi *rmidi; 26 int max = 64; 27 char byte; 28 29 if (!chip) 30 return IRQ_NONE; 31 32 rmidi = chip->rmidi; 33 if (!rmidi) { 34 inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */ 35 return IRQ_NONE; 36 } 37 38 guard(spinlock)(&chip->midi_input_lock); 39 while (max-- > 0) { 40 if (inb(SBP(chip, DATA_AVAIL)) & 0x80) { 41 byte = inb(SBP(chip, READ)); 42 if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) { 43 snd_rawmidi_receive(chip->midi_substream_input, &byte, 1); 44 } 45 } 46 } 47 return IRQ_HANDLED; 48 } 49 50 static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream) 51 { 52 struct snd_sb *chip; 53 unsigned int valid_open_flags; 54 55 chip = substream->rmidi->private_data; 56 valid_open_flags = chip->hardware >= SB_HW_20 57 ? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0; 58 scoped_guard(spinlock_irqsave, &chip->open_lock) { 59 if (chip->open & ~valid_open_flags) 60 return -EAGAIN; 61 chip->open |= SB_OPEN_MIDI_INPUT; 62 chip->midi_substream_input = substream; 63 if (chip->open & SB_OPEN_MIDI_OUTPUT) 64 return 0; 65 } 66 snd_sbdsp_reset(chip); /* reset DSP */ 67 if (chip->hardware >= SB_HW_20) 68 snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ); 69 return 0; 70 } 71 72 static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream) 73 { 74 struct snd_sb *chip; 75 unsigned int valid_open_flags; 76 77 chip = substream->rmidi->private_data; 78 valid_open_flags = chip->hardware >= SB_HW_20 79 ? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0; 80 scoped_guard(spinlock_irqsave, &chip->open_lock) { 81 if (chip->open & ~valid_open_flags) 82 return -EAGAIN; 83 chip->open |= SB_OPEN_MIDI_OUTPUT; 84 chip->midi_substream_output = substream; 85 if (chip->open & SB_OPEN_MIDI_INPUT) 86 return 0; 87 } 88 snd_sbdsp_reset(chip); /* reset DSP */ 89 if (chip->hardware >= SB_HW_20) 90 snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ); 91 return 0; 92 } 93 94 static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream) 95 { 96 struct snd_sb *chip; 97 98 chip = substream->rmidi->private_data; 99 scoped_guard(spinlock_irqsave, &chip->open_lock) { 100 chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER); 101 chip->midi_substream_input = NULL; 102 if (chip->open & SB_OPEN_MIDI_OUTPUT) 103 return 0; 104 } 105 snd_sbdsp_reset(chip); /* reset DSP */ 106 return 0; 107 } 108 109 static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream) 110 { 111 struct snd_sb *chip; 112 113 chip = substream->rmidi->private_data; 114 timer_delete_sync(&chip->midi_timer); 115 scoped_guard(spinlock_irqsave, &chip->open_lock) { 116 chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER); 117 chip->midi_substream_output = NULL; 118 if (chip->open & SB_OPEN_MIDI_INPUT) 119 return 0; 120 } 121 snd_sbdsp_reset(chip); /* reset DSP */ 122 return 0; 123 } 124 125 static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up) 126 { 127 struct snd_sb *chip; 128 129 chip = substream->rmidi->private_data; 130 guard(spinlock_irqsave)(&chip->open_lock); 131 if (up) { 132 if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) { 133 if (chip->hardware < SB_HW_20) 134 snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ); 135 chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER; 136 } 137 } else { 138 if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) { 139 if (chip->hardware < SB_HW_20) 140 snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ); 141 chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER; 142 } 143 } 144 } 145 146 static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream) 147 { 148 struct snd_sb *chip; 149 char byte; 150 int max = 32; 151 152 /* how big is Tx FIFO? */ 153 chip = substream->rmidi->private_data; 154 while (max-- > 0) { 155 guard(spinlock_irqsave)(&chip->open_lock); 156 if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) { 157 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER; 158 timer_delete(&chip->midi_timer); 159 break; 160 } 161 if (chip->hardware >= SB_HW_20) { 162 int timeout = 8; 163 while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0) 164 ; 165 if (timeout == 0) { 166 /* Tx FIFO full - try again later */ 167 break; 168 } 169 outb(byte, SBP(chip, WRITE)); 170 } else { 171 snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT); 172 snd_sbdsp_command(chip, byte); 173 } 174 snd_rawmidi_transmit_ack(substream, 1); 175 } 176 } 177 178 static void snd_sb8dsp_midi_output_timer(struct timer_list *t) 179 { 180 struct snd_sb *chip = timer_container_of(chip, t, midi_timer); 181 struct snd_rawmidi_substream *substream = chip->midi_substream_output; 182 183 scoped_guard(spinlock_irqsave, &chip->open_lock) { 184 mod_timer(&chip->midi_timer, 1 + jiffies); 185 } 186 snd_sb8dsp_midi_output_write(substream); 187 } 188 189 static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up) 190 { 191 struct snd_sb *chip; 192 193 chip = substream->rmidi->private_data; 194 scoped_guard(spinlock_irqsave, &chip->open_lock) { 195 if (up) { 196 if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) { 197 mod_timer(&chip->midi_timer, 1 + jiffies); 198 chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER; 199 } 200 } else { 201 if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) { 202 chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER; 203 } 204 } 205 } 206 207 if (up) 208 snd_sb8dsp_midi_output_write(substream); 209 } 210 211 static const struct snd_rawmidi_ops snd_sb8dsp_midi_output = 212 { 213 .open = snd_sb8dsp_midi_output_open, 214 .close = snd_sb8dsp_midi_output_close, 215 .trigger = snd_sb8dsp_midi_output_trigger, 216 }; 217 218 static const struct snd_rawmidi_ops snd_sb8dsp_midi_input = 219 { 220 .open = snd_sb8dsp_midi_input_open, 221 .close = snd_sb8dsp_midi_input_close, 222 .trigger = snd_sb8dsp_midi_input_trigger, 223 }; 224 225 int snd_sb8dsp_midi(struct snd_sb *chip, int device) 226 { 227 struct snd_rawmidi *rmidi; 228 int err; 229 230 err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi); 231 if (err < 0) 232 return err; 233 strscpy(rmidi->name, "SB8 MIDI"); 234 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output); 235 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input); 236 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT; 237 if (chip->hardware >= SB_HW_20) 238 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; 239 rmidi->private_data = chip; 240 timer_setup(&chip->midi_timer, snd_sb8dsp_midi_output_timer, 0); 241 chip->rmidi = rmidi; 242 return 0; 243 } 244