sound/firewire/tascam/tascam-transaction.c

   1 /*
   2  * tascam-transaction.c - a part of driver for TASCAM FireWire series
   3  *
   4  * Copyright (c) 2015 Takashi Sakamoto
   5  *
   6  * Licensed under the terms of the GNU General Public License, version 2.
   7  */
   8
   9 #include "tascam.h"
  10
  11 /*
  12  * When return minus value, given argument is not MIDI status.
  13  * When return 0, given argument is a beginning of system exclusive.
  14  * When return the others, given argument is MIDI data.
  15  */
  16 static inline int calculate_message_bytes(u8 status)
  17 {
  18         switch (status) {
  19         case 0xf6:      /* Tune request. */
  20         case 0xf8:      /* Timing clock. */
  21         case 0xfa:      /* Start. */
  22         case 0xfb:      /* Continue. */
  23         case 0xfc:      /* Stop. */
  24         case 0xfe:      /* Active sensing. */
  25         case 0xff:      /* System reset. */
  26                 return 1;
  27         case 0xf1:      /* MIDI time code quarter frame. */
  28         case 0xf3:      /* Song select. */
  29                 return 2;
  30         case 0xf2:      /* Song position pointer. */
  31                 return 3;
  32         case 0xf0:      /* Exclusive. */
  33                 return 0;
  34         case 0xf7:      /* End of exclusive. */
  35                 break;
  36         case 0xf4:      /* Undefined. */
  37         case 0xf5:      /* Undefined. */
  38         case 0xf9:      /* Undefined. */
  39         case 0xfd:      /* Undefined. */
  40                 break;
  41         default:
  42                 switch (status & 0xf0) {
  43                 case 0x80:      /* Note on. */
  44                 case 0x90:      /* Note off. */
  45                 case 0xa0:      /* Polyphonic key pressure. */
  46                 case 0xb0:      /* Control change and Mode change. */
  47                 case 0xe0:      /* Pitch bend change. */
  48                         return 3;
  49                 case 0xc0:      /* Program change. */
  50                 case 0xd0:      /* Channel pressure. */
  51                         return 2;
  52                 default:
  53                 break;
  54                 }
  55         break;
  56         }
  57
  58         return -EINVAL;
  59 }
  60
  61 static int fill_message(struct snd_rawmidi_substream *substream, u8 *buf)
  62 {
  63         struct snd_tscm *tscm = substream->rmidi->private_data;
  64         unsigned int port = substream->number;
  65         int i, len, consume;
  66         u8 *label, *msg;
  67         u8 status;
  68
  69         /* The first byte is used for label, the rest for MIDI bytes. */
  70         label = buf;
  71         msg = buf + 1;
  72
  73         consume = snd_rawmidi_transmit_peek(substream, msg, 3);
  74         if (consume == 0)
  75                 return 0;
  76
  77         /* On exclusive message. */
  78         if (tscm->on_sysex[port]) {
  79                 /* Seek the end of exclusives. */
  80                 for (i = 0; i < consume; ++i) {
  81                         if (msg[i] == 0xf7) {
  82                                 tscm->on_sysex[port] = false;
  83                                 break;
  84                         }
  85                 }
  86
  87                 /* At the end of exclusive message, use label 0x07. */
  88                 if (!tscm->on_sysex[port]) {
  89                         consume = i + 1;
  90                         *label = (port << 4) | 0x07;
  91                 /* During exclusive message, use label 0x04. */
  92                 } else if (consume == 3) {
  93                         *label = (port << 4) | 0x04;
  94                 /* We need to fill whole 3 bytes. Go to next change. */
  95                 } else {
  96                         return 0;
  97                 }
  98
  99                 len = consume;
 100         } else {
 101                 /* The beginning of exclusives. */
 102                 if (msg[0] == 0xf0) {
 103                         /* Transfer it in next chance in another condition. */
 104                         tscm->on_sysex[port] = true;
 105                         return 0;
 106                 } else {
 107                         /* On running-status. */
 108                         if ((msg[0] & 0x80) != 0x80)
 109                                 status = tscm->running_status[port];
 110                         else
 111                                 status = msg[0];
 112
 113                         /* Calculate consume bytes. */
 114                         len = calculate_message_bytes(status);
 115                         if (len <= 0)
 116                                 return 0;
 117
 118                         /* On running-status. */
 119                         if ((msg[0] & 0x80) != 0x80) {
 120                                 /* Enough MIDI bytes were not retrieved. */
 121                                 if (consume < len - 1)
 122                                         return 0;
 123                                 consume = len - 1;
 124
 125                                 msg[2] = msg[1];
 126                                 msg[1] = msg[0];
 127                                 msg[0] = tscm->running_status[port];
 128                         } else {
 129                                 /* Enough MIDI bytes were not retrieved. */
 130                                 if (consume < len)
 131                                         return 0;
 132                                 consume = len;
 133
 134                                 tscm->running_status[port] = msg[0];
 135                         }
 136                 }
 137
 138                 *label = (port << 4) | (msg[0] >> 4);
 139         }
 140
 141         if (len > 0 && len < 3)
 142                 memset(msg + len, 0, 3 - len);
 143
 144         return consume;
 145 }
 146
 147 static void handle_midi_tx(struct fw_card *card, struct fw_request *request,
 148                            int tcode, int destination, int source,
 149                            int generation, unsigned long long offset,
 150                            void *data, size_t length, void *callback_data)
 151 {
 152         struct snd_tscm *tscm = callback_data;
 153         u32 *buf = (u32 *)data;
 154         unsigned int messages;
 155         unsigned int i;
 156         unsigned int port;
 157         struct snd_rawmidi_substream *substream;
 158         u8 *b;
 159         int bytes;
 160
 161         if (offset != tscm->async_handler.offset)
 162                 goto end;
 163
 164         messages = length / 8;
 165         for (i = 0; i < messages; i++) {
 166                 b = (u8 *)(buf + i * 2);
 167
 168                 port = b[0] >> 4;
 169                 /* TODO: support virtual MIDI ports. */
 170                 if (port >= tscm->spec->midi_capture_ports)
 171                         goto end;
 172
 173                 /* Assume the message length. */
 174                 bytes = calculate_message_bytes(b[1]);
 175                 /* On MIDI data or exclusives. */
 176                 if (bytes <= 0) {
 177                         /* Seek the end of exclusives. */
 178                         for (bytes = 1; bytes < 4; bytes++) {
 179                                 if (b[bytes] == 0xf7)
 180                                         break;
 181                         }
 182                         if (bytes == 4)
 183                                 bytes = 3;
 184                 }
 185
 186                 substream = ACCESS_ONCE(tscm->tx_midi_substreams[port]);
 187                 if (substream != NULL)
 188                         snd_rawmidi_receive(substream, b + 1, bytes);
 189         }
 190 end:
 191         fw_send_response(card, request, RCODE_COMPLETE);
 192 }
 193
 194 int snd_tscm_transaction_register(struct snd_tscm *tscm)
 195 {
 196         static const struct fw_address_region resp_register_region = {
 197                 .start  = 0xffffe0000000ull,
 198                 .end    = 0xffffe000ffffull,
 199         };
 200         unsigned int i;
 201         int err;
 202
 203         /*
 204          * Usually, two quadlets are transferred by one transaction. The first
 205          * quadlet has MIDI messages, the rest includes timestamp.
 206          * Sometimes, 8 set of the data is transferred by a block transaction.
 207          */
 208         tscm->async_handler.length = 8 * 8;
 209         tscm->async_handler.address_callback = handle_midi_tx;
 210         tscm->async_handler.callback_data = tscm;
 211
 212         err = fw_core_add_address_handler(&tscm->async_handler,
 213                                           &resp_register_region);
 214         if (err < 0)
 215                 return err;
 216
 217         err = snd_tscm_transaction_reregister(tscm);
 218         if (err < 0)
 219                 goto error;
 220
 221         for (i = 0; i < TSCM_MIDI_OUT_PORT_MAX; i++) {
 222                 err = snd_fw_async_midi_port_init(
 223                                 &tscm->out_ports[i], tscm->unit,
 224                                 TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_RX_QUAD,
 225                                 4, fill_message);
 226                 if (err < 0)
 227                         goto error;
 228         }
 229
 230         return err;
 231 error:
 232         fw_core_remove_address_handler(&tscm->async_handler);
 233         return err;
 234 }
 235
 236 /* At bus reset, these registers are cleared. */
 237 int snd_tscm_transaction_reregister(struct snd_tscm *tscm)
 238 {
 239         struct fw_device *device = fw_parent_device(tscm->unit);
 240         __be32 reg;
 241         int err;
 242
 243         /* Register messaging address. Block transaction is not allowed. */
 244         reg = cpu_to_be32((device->card->node_id << 16) |
 245                           (tscm->async_handler.offset >> 32));
 246         err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
 247                                  TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ADDR_HI,
 248                                  &reg, sizeof(reg), 0);
 249         if (err < 0)
 250                 return err;
 251
 252         reg = cpu_to_be32(tscm->async_handler.offset);
 253         err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
 254                                  TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ADDR_LO,
 255                                  &reg, sizeof(reg), 0);
 256         if (err < 0)
 257                 return err;
 258
 259         /* Turn on messaging. */
 260         reg = cpu_to_be32(0x00000001);
 261         err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
 262                                   TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ON,
 263                                   &reg, sizeof(reg), 0);
 264         if (err < 0)
 265                 return err;
 266
 267         /* Turn on FireWire LED. */
 268         reg = cpu_to_be32(0x0001008e);
 269         return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
 270                                   TSCM_ADDR_BASE + TSCM_OFFSET_LED_POWER,
 271                                   &reg, sizeof(reg), 0);
 272 }
 273
 274 void snd_tscm_transaction_unregister(struct snd_tscm *tscm)
 275 {
 276         __be32 reg;
 277         unsigned int i;
 278
 279         /* Turn off FireWire LED. */
 280         reg = cpu_to_be32(0x0000008e);
 281         snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
 282                            TSCM_ADDR_BASE + TSCM_OFFSET_LED_POWER,
 283                            &reg, sizeof(reg), 0);
 284
 285         /* Turn off messaging. */
 286         reg = cpu_to_be32(0x00000000);
 287         snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
 288                            TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ON,
 289                            &reg, sizeof(reg), 0);
 290
 291         /* Unregister the address. */
 292         snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
 293                            TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ADDR_HI,
 294                            &reg, sizeof(reg), 0);
 295         snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
 296                            TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ADDR_LO,
 297                            &reg, sizeof(reg), 0);
 298
 299         fw_core_remove_address_handler(&tscm->async_handler);
 300         for (i = 0; i < TSCM_MIDI_OUT_PORT_MAX; i++)
 301                 snd_fw_async_midi_port_destroy(&tscm->out_ports[i]);
 302 }