sound/firewire/dice/dice.c

   1 /*
   2  * TC Applied Technologies Digital Interface Communications Engine driver
   3  *
   4  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
   5  * Licensed under the terms of the GNU General Public License, version 2.
   6  */
   7
   8 #include "dice.h"
   9
  10 MODULE_DESCRIPTION("DICE driver");
  11 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  12 MODULE_LICENSE("GPL v2");
  13
  14 #define OUI_WEISS               0x001c6a
  15
  16 #define DICE_CATEGORY_ID        0x04
  17 #define WEISS_CATEGORY_ID       0x00
  18
  19 static int dice_interface_check(struct fw_unit *unit)
  20 {
  21         static const int min_values[10] = {
  22                 10, 0x64 / 4,
  23                 10, 0x18 / 4,
  24                 10, 0x18 / 4,
  25                 0, 0,
  26                 0, 0,
  27         };
  28         struct fw_device *device = fw_parent_device(unit);
  29         struct fw_csr_iterator it;
  30         int key, val, vendor = -1, model = -1, err;
  31         unsigned int category, i;
  32         __be32 *pointers, value;
  33         __be32 version;
  34
  35         pointers = kmalloc_array(ARRAY_SIZE(min_values), sizeof(__be32),
  36                                  GFP_KERNEL);
  37         if (pointers == NULL)
  38                 return -ENOMEM;
  39
  40         /*
  41          * Check that GUID and unit directory are constructed according to DICE
  42          * rules, i.e., that the specifier ID is the GUID's OUI, and that the
  43          * GUID chip ID consists of the 8-bit category ID, the 10-bit product
  44          * ID, and a 22-bit serial number.
  45          */
  46         fw_csr_iterator_init(&it, unit->directory);
  47         while (fw_csr_iterator_next(&it, &key, &val)) {
  48                 switch (key) {
  49                 case CSR_SPECIFIER_ID:
  50                         vendor = val;
  51                         break;
  52                 case CSR_MODEL:
  53                         model = val;
  54                         break;
  55                 }
  56         }
  57         if (vendor == OUI_WEISS)
  58                 category = WEISS_CATEGORY_ID;
  59         else
  60                 category = DICE_CATEGORY_ID;
  61         if (device->config_rom[3] != ((vendor << 8) | category) ||
  62             device->config_rom[4] >> 22 != model) {
  63                 err = -ENODEV;
  64                 goto end;
  65         }
  66
  67         /*
  68          * Check that the sub address spaces exist and are located inside the
  69          * private address space.  The minimum values are chosen so that all
  70          * minimally required registers are included.
  71          */
  72         err = snd_fw_transaction(unit, TCODE_READ_BLOCK_REQUEST,
  73                                  DICE_PRIVATE_SPACE, pointers,
  74                                  sizeof(__be32) * ARRAY_SIZE(min_values), 0);
  75         if (err < 0) {
  76                 err = -ENODEV;
  77                 goto end;
  78         }
  79         for (i = 0; i < ARRAY_SIZE(min_values); ++i) {
  80                 value = be32_to_cpu(pointers[i]);
  81                 if (value < min_values[i] || value >= 0x40000) {
  82                         err = -ENODEV;
  83                         goto end;
  84                 }
  85         }
  86
  87         /*
  88          * Check that the implemented DICE driver specification major version
  89          * number matches.
  90          */
  91         err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
  92                                  DICE_PRIVATE_SPACE +
  93                                  be32_to_cpu(pointers[0]) * 4 + GLOBAL_VERSION,
  94                                  &version, 4, 0);
  95         if (err < 0) {
  96                 err = -ENODEV;
  97                 goto end;
  98         }
  99         if ((version & cpu_to_be32(0xff000000)) != cpu_to_be32(0x01000000)) {
 100                 dev_err(&unit->device,
 101                         "unknown DICE version: 0x%08x\n", be32_to_cpu(version));
 102                 err = -ENODEV;
 103                 goto end;
 104         }
 105 end:
 106         return err;
 107 }
 108
 109 static int highest_supported_mode_rate(struct snd_dice *dice,
 110                                        unsigned int mode, unsigned int *rate)
 111 {
 112         unsigned int i, m;
 113
 114         for (i = ARRAY_SIZE(snd_dice_rates); i > 0; i--) {
 115                 *rate = snd_dice_rates[i - 1];
 116                 if (snd_dice_stream_get_rate_mode(dice, *rate, &m) < 0)
 117                         continue;
 118                 if (mode == m)
 119                         break;
 120         }
 121         if (i == 0)
 122                 return -EINVAL;
 123
 124         return 0;
 125 }
 126
 127 static int dice_read_mode_params(struct snd_dice *dice, unsigned int mode)
 128 {
 129         __be32 values[2];
 130         unsigned int rate;
 131         int err;
 132
 133         if (highest_supported_mode_rate(dice, mode, &rate) < 0) {
 134                 dice->tx_channels[mode] = 0;
 135                 dice->tx_midi_ports[mode] = 0;
 136                 dice->rx_channels[mode] = 0;
 137                 dice->rx_midi_ports[mode] = 0;
 138                 return 0;
 139         }
 140
 141         err = snd_dice_transaction_set_rate(dice, rate);
 142         if (err < 0)
 143                 return err;
 144
 145         err = snd_dice_transaction_read_tx(dice, TX_NUMBER_AUDIO,
 146                                            values, sizeof(values));
 147         if (err < 0)
 148                 return err;
 149
 150         dice->tx_channels[mode]   = be32_to_cpu(values[0]);
 151         dice->tx_midi_ports[mode] = be32_to_cpu(values[1]);
 152
 153         err = snd_dice_transaction_read_rx(dice, RX_NUMBER_AUDIO,
 154                                            values, sizeof(values));
 155         if (err < 0)
 156                 return err;
 157
 158         dice->rx_channels[mode]   = be32_to_cpu(values[0]);
 159         dice->rx_midi_ports[mode] = be32_to_cpu(values[1]);
 160
 161         return 0;
 162 }
 163
 164 static int dice_read_params(struct snd_dice *dice)
 165 {
 166         __be32 value;
 167         int mode, err;
 168
 169         /* some very old firmwares don't tell about their clock support */
 170         if (dice->clock_caps > 0) {
 171                 err = snd_dice_transaction_read_global(dice,
 172                                                 GLOBAL_CLOCK_CAPABILITIES,
 173                                                 &value, 4);
 174                 if (err < 0)
 175                         return err;
 176                 dice->clock_caps = be32_to_cpu(value);
 177         } else {
 178                 /* this should be supported by any device */
 179                 dice->clock_caps = CLOCK_CAP_RATE_44100 |
 180                                    CLOCK_CAP_RATE_48000 |
 181                                    CLOCK_CAP_SOURCE_ARX1 |
 182                                    CLOCK_CAP_SOURCE_INTERNAL;
 183         }
 184
 185         for (mode = 2; mode >= 0; --mode) {
 186                 err = dice_read_mode_params(dice, mode);
 187                 if (err < 0)
 188                         return err;
 189         }
 190
 191         return 0;
 192 }
 193
 194 static void dice_card_strings(struct snd_dice *dice)
 195 {
 196         struct snd_card *card = dice->card;
 197         struct fw_device *dev = fw_parent_device(dice->unit);
 198         char vendor[32], model[32];
 199         unsigned int i;
 200         int err;
 201
 202         strcpy(card->driver, "DICE");
 203
 204         strcpy(card->shortname, "DICE");
 205         BUILD_BUG_ON(NICK_NAME_SIZE < sizeof(card->shortname));
 206         err = snd_dice_transaction_read_global(dice, GLOBAL_NICK_NAME,
 207                                                card->shortname,
 208                                                sizeof(card->shortname));
 209         if (err >= 0) {
 210                 /* DICE strings are returned in "always-wrong" endianness */
 211                 BUILD_BUG_ON(sizeof(card->shortname) % 4 != 0);
 212                 for (i = 0; i < sizeof(card->shortname); i += 4)
 213                         swab32s((u32 *)&card->shortname[i]);
 214                 card->shortname[sizeof(card->shortname) - 1] = '\0';
 215         }
 216
 217         strcpy(vendor, "?");
 218         fw_csr_string(dev->config_rom + 5, CSR_VENDOR, vendor, sizeof(vendor));
 219         strcpy(model, "?");
 220         fw_csr_string(dice->unit->directory, CSR_MODEL, model, sizeof(model));
 221         snprintf(card->longname, sizeof(card->longname),
 222                  "%s %s (serial %u) at %s, S%d",
 223                  vendor, model, dev->config_rom[4] & 0x3fffff,
 224                  dev_name(&dice->unit->device), 100 << dev->max_speed);
 225
 226         strcpy(card->mixername, "DICE");
 227 }
 228
 229 static void dice_card_free(struct snd_card *card)
 230 {
 231         struct snd_dice *dice = card->private_data;
 232
 233         snd_dice_transaction_destroy(dice);
 234         mutex_destroy(&dice->mutex);
 235 }
 236
 237 static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
 238 {
 239         struct snd_card *card;
 240         struct snd_dice *dice;
 241         int err;
 242
 243         err = dice_interface_check(unit);
 244         if (err < 0)
 245                 goto end;
 246
 247         err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
 248                            sizeof(*dice), &card);
 249         if (err < 0)
 250                 goto end;
 251
 252         dice = card->private_data;
 253         dice->card = card;
 254         dice->unit = unit;
 255         card->private_free = dice_card_free;
 256
 257         spin_lock_init(&dice->lock);
 258         mutex_init(&dice->mutex);
 259         init_completion(&dice->clock_accepted);
 260         init_waitqueue_head(&dice->hwdep_wait);
 261
 262         err = snd_dice_transaction_init(dice);
 263         if (err < 0)
 264                 goto error;
 265
 266         err = dice_read_params(dice);
 267         if (err < 0)
 268                 goto error;
 269
 270         dice_card_strings(dice);
 271
 272         err = snd_dice_create_pcm(dice);
 273         if (err < 0)
 274                 goto error;
 275
 276         err = snd_dice_create_hwdep(dice);
 277         if (err < 0)
 278                 goto error;
 279
 280         snd_dice_create_proc(dice);
 281
 282         err = snd_dice_create_midi(dice);
 283         if (err < 0)
 284                 goto error;
 285
 286         err = snd_dice_stream_init_duplex(dice);
 287         if (err < 0)
 288                 goto error;
 289
 290         err = snd_card_register(card);
 291         if (err < 0) {
 292                 snd_dice_stream_destroy_duplex(dice);
 293                 goto error;
 294         }
 295
 296         dev_set_drvdata(&unit->device, dice);
 297 end:
 298         return err;
 299 error:
 300         snd_card_free(card);
 301         return err;
 302 }
 303
 304 static void dice_remove(struct fw_unit *unit)
 305 {
 306         struct snd_dice *dice = dev_get_drvdata(&unit->device);
 307
 308         snd_card_disconnect(dice->card);
 309
 310         snd_dice_stream_destroy_duplex(dice);
 311
 312         snd_card_free_when_closed(dice->card);
 313 }
 314
 315 static void dice_bus_reset(struct fw_unit *unit)
 316 {
 317         struct snd_dice *dice = dev_get_drvdata(&unit->device);
 318
 319         /* The handler address register becomes initialized. */
 320         snd_dice_transaction_reinit(dice);
 321
 322         mutex_lock(&dice->mutex);
 323         snd_dice_stream_update_duplex(dice);
 324         mutex_unlock(&dice->mutex);
 325 }
 326
 327 #define DICE_INTERFACE  0x000001
 328
 329 static const struct ieee1394_device_id dice_id_table[] = {
 330         {
 331                 .match_flags = IEEE1394_MATCH_VERSION,
 332                 .version     = DICE_INTERFACE,
 333         },
 334         { }
 335 };
 336 MODULE_DEVICE_TABLE(ieee1394, dice_id_table);
 337
 338 static struct fw_driver dice_driver = {
 339         .driver   = {
 340                 .owner  = THIS_MODULE,
 341                 .name   = KBUILD_MODNAME,
 342                 .bus    = &fw_bus_type,
 343         },
 344         .probe    = dice_probe,
 345         .update   = dice_bus_reset,
 346         .remove   = dice_remove,
 347         .id_table = dice_id_table,
 348 };
 349
 350 static int __init alsa_dice_init(void)
 351 {
 352         return driver_register(&dice_driver.driver);
 353 }
 354
 355 static void __exit alsa_dice_exit(void)
 356 {
 357         driver_unregister(&dice_driver.driver);
 358 }
 359
 360 module_init(alsa_dice_init);
 361 module_exit(alsa_dice_exit);