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 #define OUI_LOUD                0x000ff2
  16
  17 #define DICE_CATEGORY_ID        0x04
  18 #define WEISS_CATEGORY_ID       0x00
  19 #define LOUD_CATEGORY_ID        0x10
  20
  21 #define PROBE_DELAY_MS          (2 * MSEC_PER_SEC)
  22
  23 static int check_dice_category(struct fw_unit *unit)
  24 {
  25         struct fw_device *device = fw_parent_device(unit);
  26         struct fw_csr_iterator it;
  27         int key, val, vendor = -1, model = -1;
  28         unsigned int category;
  29
  30         /*
  31          * Check that GUID and unit directory are constructed according to DICE
  32          * rules, i.e., that the specifier ID is the GUID's OUI, and that the
  33          * GUID chip ID consists of the 8-bit category ID, the 10-bit product
  34          * ID, and a 22-bit serial number.
  35          */
  36         fw_csr_iterator_init(&it, unit->directory);
  37         while (fw_csr_iterator_next(&it, &key, &val)) {
  38                 switch (key) {
  39                 case CSR_SPECIFIER_ID:
  40                         vendor = val;
  41                         break;
  42                 case CSR_MODEL:
  43                         model = val;
  44                         break;
  45                 }
  46         }
  47         if (vendor == OUI_WEISS)
  48                 category = WEISS_CATEGORY_ID;
  49         else if (vendor == OUI_LOUD)
  50                 category = LOUD_CATEGORY_ID;
  51         else
  52                 category = DICE_CATEGORY_ID;
  53         if (device->config_rom[3] != ((vendor << 8) | category) ||
  54             device->config_rom[4] >> 22 != model)
  55                 return -ENODEV;
  56
  57         return 0;
  58 }
  59
  60 static int check_clock_caps(struct snd_dice *dice)
  61 {
  62         __be32 value;
  63         int err;
  64
  65         /* some very old firmwares don't tell about their clock support */
  66         if (dice->clock_caps > 0) {
  67                 err = snd_dice_transaction_read_global(dice,
  68                                                 GLOBAL_CLOCK_CAPABILITIES,
  69                                                 &value, 4);
  70                 if (err < 0)
  71                         return err;
  72                 dice->clock_caps = be32_to_cpu(value);
  73         } else {
  74                 /* this should be supported by any device */
  75                 dice->clock_caps = CLOCK_CAP_RATE_44100 |
  76                                    CLOCK_CAP_RATE_48000 |
  77                                    CLOCK_CAP_SOURCE_ARX1 |
  78                                    CLOCK_CAP_SOURCE_INTERNAL;
  79         }
  80
  81         return 0;
  82 }
  83
  84 static void dice_card_strings(struct snd_dice *dice)
  85 {
  86         struct snd_card *card = dice->card;
  87         struct fw_device *dev = fw_parent_device(dice->unit);
  88         char vendor[32], model[32];
  89         unsigned int i;
  90         int err;
  91
  92         strcpy(card->driver, "DICE");
  93
  94         strcpy(card->shortname, "DICE");
  95         BUILD_BUG_ON(NICK_NAME_SIZE < sizeof(card->shortname));
  96         err = snd_dice_transaction_read_global(dice, GLOBAL_NICK_NAME,
  97                                                card->shortname,
  98                                                sizeof(card->shortname));
  99         if (err >= 0) {
 100                 /* DICE strings are returned in "always-wrong" endianness */
 101                 BUILD_BUG_ON(sizeof(card->shortname) % 4 != 0);
 102                 for (i = 0; i < sizeof(card->shortname); i += 4)
 103                         swab32s((u32 *)&card->shortname[i]);
 104                 card->shortname[sizeof(card->shortname) - 1] = '\0';
 105         }
 106
 107         strcpy(vendor, "?");
 108         fw_csr_string(dev->config_rom + 5, CSR_VENDOR, vendor, sizeof(vendor));
 109         strcpy(model, "?");
 110         fw_csr_string(dice->unit->directory, CSR_MODEL, model, sizeof(model));
 111         snprintf(card->longname, sizeof(card->longname),
 112                  "%s %s (serial %u) at %s, S%d",
 113                  vendor, model, dev->config_rom[4] & 0x3fffff,
 114                  dev_name(&dice->unit->device), 100 << dev->max_speed);
 115
 116         strcpy(card->mixername, "DICE");
 117 }
 118
 119 static void dice_free(struct snd_dice *dice)
 120 {
 121         snd_dice_stream_destroy_duplex(dice);
 122         snd_dice_transaction_destroy(dice);
 123         fw_unit_put(dice->unit);
 124
 125         mutex_destroy(&dice->mutex);
 126         kfree(dice);
 127 }
 128
 129 /*
 130  * This module releases the FireWire unit data after all ALSA character devices
 131  * are released by applications. This is for releasing stream data or finishing
 132  * transactions safely. Thus at returning from .remove(), this module still keep
 133  * references for the unit.
 134  */
 135 static void dice_card_free(struct snd_card *card)
 136 {
 137         dice_free(card->private_data);
 138 }
 139
 140 static void do_registration(struct work_struct *work)
 141 {
 142         struct snd_dice *dice = container_of(work, struct snd_dice, dwork.work);
 143         int err;
 144
 145         if (dice->registered)
 146                 return;
 147
 148         err = snd_card_new(&dice->unit->device, -1, NULL, THIS_MODULE, 0,
 149                            &dice->card);
 150         if (err < 0)
 151                 return;
 152
 153         err = snd_dice_transaction_init(dice);
 154         if (err < 0)
 155                 goto error;
 156
 157         err = check_clock_caps(dice);
 158         if (err < 0)
 159                 goto error;
 160
 161         dice_card_strings(dice);
 162
 163         snd_dice_create_proc(dice);
 164
 165         err = snd_dice_create_pcm(dice);
 166         if (err < 0)
 167                 goto error;
 168
 169         err = snd_dice_create_midi(dice);
 170         if (err < 0)
 171                 goto error;
 172
 173         err = snd_dice_create_hwdep(dice);
 174         if (err < 0)
 175                 goto error;
 176
 177         err = snd_card_register(dice->card);
 178         if (err < 0)
 179                 goto error;
 180
 181         /*
 182          * After registered, dice instance can be released corresponding to
 183          * releasing the sound card instance.
 184          */
 185         dice->card->private_free = dice_card_free;
 186         dice->card->private_data = dice;
 187         dice->registered = true;
 188
 189         return;
 190 error:
 191         snd_dice_transaction_destroy(dice);
 192         snd_card_free(dice->card);
 193         dev_info(&dice->unit->device,
 194                  "Sound card registration failed: %d\n", err);
 195 }
 196
 197 static void schedule_registration(struct snd_dice *dice)
 198 {
 199         struct fw_card *fw_card = fw_parent_device(dice->unit)->card;
 200         u64 now, delay;
 201
 202         now = get_jiffies_64();
 203         delay = fw_card->reset_jiffies + msecs_to_jiffies(PROBE_DELAY_MS);
 204
 205         if (time_after64(delay, now))
 206                 delay -= now;
 207         else
 208                 delay = 0;
 209
 210         mod_delayed_work(system_wq, &dice->dwork, delay);
 211 }
 212
 213 static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
 214 {
 215         struct snd_dice *dice;
 216         int err;
 217
 218         err = check_dice_category(unit);
 219         if (err < 0)
 220                 return -ENODEV;
 221
 222         /* Allocate this independent of sound card instance. */
 223         dice = kzalloc(sizeof(struct snd_dice), GFP_KERNEL);
 224         if (dice == NULL)
 225                 return -ENOMEM;
 226
 227         dice->unit = fw_unit_get(unit);
 228         dev_set_drvdata(&unit->device, dice);
 229
 230         spin_lock_init(&dice->lock);
 231         mutex_init(&dice->mutex);
 232         init_completion(&dice->clock_accepted);
 233         init_waitqueue_head(&dice->hwdep_wait);
 234
 235         err = snd_dice_stream_init_duplex(dice);
 236         if (err < 0) {
 237                 dice_free(dice);
 238                 return err;
 239         }
 240
 241         /* Allocate and register this sound card later. */
 242         INIT_DEFERRABLE_WORK(&dice->dwork, do_registration);
 243         schedule_registration(dice);
 244
 245         return 0;
 246 }
 247
 248 static void dice_remove(struct fw_unit *unit)
 249 {
 250         struct snd_dice *dice = dev_get_drvdata(&unit->device);
 251
 252         /*
 253          * Confirm to stop the work for registration before the sound card is
 254          * going to be released. The work is not scheduled again because bus
 255          * reset handler is not called anymore.
 256          */
 257         cancel_delayed_work_sync(&dice->dwork);
 258
 259         if (dice->registered) {
 260                 /* No need to wait for releasing card object in this context. */
 261                 snd_card_free_when_closed(dice->card);
 262         } else {
 263                 /* Don't forget this case. */
 264                 dice_free(dice);
 265         }
 266 }
 267
 268 static void dice_bus_reset(struct fw_unit *unit)
 269 {
 270         struct snd_dice *dice = dev_get_drvdata(&unit->device);
 271
 272         /* Postpone a workqueue for deferred registration. */
 273         if (!dice->registered)
 274                 schedule_registration(dice);
 275
 276         /* The handler address register becomes initialized. */
 277         snd_dice_transaction_reinit(dice);
 278
 279         /*
 280          * After registration, userspace can start packet streaming, then this
 281          * code block works fine.
 282          */
 283         if (dice->registered) {
 284                 mutex_lock(&dice->mutex);
 285                 snd_dice_stream_update_duplex(dice);
 286                 mutex_unlock(&dice->mutex);
 287         }
 288 }
 289
 290 #define DICE_INTERFACE  0x000001
 291
 292 static const struct ieee1394_device_id dice_id_table[] = {
 293         {
 294                 .match_flags = IEEE1394_MATCH_VERSION,
 295                 .version     = DICE_INTERFACE,
 296         },
 297         { }
 298 };
 299 MODULE_DEVICE_TABLE(ieee1394, dice_id_table);
 300
 301 static struct fw_driver dice_driver = {
 302         .driver   = {
 303                 .owner  = THIS_MODULE,
 304                 .name   = KBUILD_MODNAME,
 305                 .bus    = &fw_bus_type,
 306         },
 307         .probe    = dice_probe,
 308         .update   = dice_bus_reset,
 309         .remove   = dice_remove,
 310         .id_table = dice_id_table,
 311 };
 312
 313 static int __init alsa_dice_init(void)
 314 {
 315         return driver_register(&dice_driver.driver);
 316 }
 317
 318 static void __exit alsa_dice_exit(void)
 319 {
 320         driver_unregister(&dice_driver.driver);
 321 }
 322
 323 module_init(alsa_dice_init);
 324 module_exit(alsa_dice_exit);