sound/firewire/digi00x/digi00x.c

   1 /*
   2  * digi00x.c - a part of driver for Digidesign Digi 002/003 family
   3  *
   4  * Copyright (c) 2014-2015 Takashi Sakamoto
   5  *
   6  * Licensed under the terms of the GNU General Public License, version 2.
   7  */
   8
   9 #include "digi00x.h"
  10
  11 MODULE_DESCRIPTION("Digidesign Digi 002/003 family Driver");
  12 MODULE_AUTHOR("Takashi Sakamoto <o-takashi@sakamocchi.jp>");
  13 MODULE_LICENSE("GPL v2");
  14
  15 #define VENDOR_DIGIDESIGN       0x00a07e
  16 #define MODEL_DIGI00X           0x000002
  17
  18 static int name_card(struct snd_dg00x *dg00x)
  19 {
  20         struct fw_device *fw_dev = fw_parent_device(dg00x->unit);
  21         char name[32] = {0};
  22         char *model;
  23         int err;
  24
  25         err = fw_csr_string(dg00x->unit->directory, CSR_MODEL, name,
  26                             sizeof(name));
  27         if (err < 0)
  28                 return err;
  29
  30         model = skip_spaces(name);
  31
  32         strcpy(dg00x->card->driver, "Digi00x");
  33         strcpy(dg00x->card->shortname, model);
  34         strcpy(dg00x->card->mixername, model);
  35         snprintf(dg00x->card->longname, sizeof(dg00x->card->longname),
  36                  "Digidesign %s, GUID %08x%08x at %s, S%d", model,
  37                  fw_dev->config_rom[3], fw_dev->config_rom[4],
  38                  dev_name(&dg00x->unit->device), 100 << fw_dev->max_speed);
  39
  40         return 0;
  41 }
  42
  43 static void dg00x_free(struct snd_dg00x *dg00x)
  44 {
  45         snd_dg00x_stream_destroy_duplex(dg00x);
  46         snd_dg00x_transaction_unregister(dg00x);
  47
  48         fw_unit_put(dg00x->unit);
  49
  50         mutex_destroy(&dg00x->mutex);
  51 }
  52
  53 static void dg00x_card_free(struct snd_card *card)
  54 {
  55         dg00x_free(card->private_data);
  56 }
  57
  58 static void do_registration(struct work_struct *work)
  59 {
  60         struct snd_dg00x *dg00x =
  61                         container_of(work, struct snd_dg00x, dwork.work);
  62         int err;
  63
  64         if (dg00x->registered)
  65                 return;
  66
  67         err = snd_card_new(&dg00x->unit->device, -1, NULL, THIS_MODULE, 0,
  68                            &dg00x->card);
  69         if (err < 0)
  70                 return;
  71
  72         err = name_card(dg00x);
  73         if (err < 0)
  74                 goto error;
  75
  76         err = snd_dg00x_stream_init_duplex(dg00x);
  77         if (err < 0)
  78                 goto error;
  79
  80         snd_dg00x_proc_init(dg00x);
  81
  82         err = snd_dg00x_create_pcm_devices(dg00x);
  83         if (err < 0)
  84                 goto error;
  85
  86         err = snd_dg00x_create_midi_devices(dg00x);
  87         if (err < 0)
  88                 goto error;
  89
  90         err = snd_dg00x_create_hwdep_device(dg00x);
  91         if (err < 0)
  92                 goto error;
  93
  94         err = snd_dg00x_transaction_register(dg00x);
  95         if (err < 0)
  96                 goto error;
  97
  98         err = snd_card_register(dg00x->card);
  99         if (err < 0)
 100                 goto error;
 101
 102         dg00x->card->private_free = dg00x_card_free;
 103         dg00x->card->private_data = dg00x;
 104         dg00x->registered = true;
 105
 106         return;
 107 error:
 108         snd_dg00x_transaction_unregister(dg00x);
 109         snd_dg00x_stream_destroy_duplex(dg00x);
 110         snd_card_free(dg00x->card);
 111         dev_info(&dg00x->unit->device,
 112                  "Sound card registration failed: %d\n", err);
 113 }
 114
 115 static int snd_dg00x_probe(struct fw_unit *unit,
 116                            const struct ieee1394_device_id *entry)
 117 {
 118         struct snd_dg00x *dg00x;
 119
 120         /* Allocate this independent of sound card instance. */
 121         dg00x = kzalloc(sizeof(struct snd_dg00x), GFP_KERNEL);
 122         if (dg00x == NULL)
 123                 return -ENOMEM;
 124
 125         dg00x->unit = fw_unit_get(unit);
 126         dev_set_drvdata(&unit->device, dg00x);
 127
 128         mutex_init(&dg00x->mutex);
 129         spin_lock_init(&dg00x->lock);
 130         init_waitqueue_head(&dg00x->hwdep_wait);
 131
 132         /* Allocate and register this sound card later. */
 133         INIT_DEFERRABLE_WORK(&dg00x->dwork, do_registration);
 134         snd_fw_schedule_registration(unit, &dg00x->dwork);
 135
 136         return 0;
 137 }
 138
 139 static void snd_dg00x_update(struct fw_unit *unit)
 140 {
 141         struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device);
 142
 143         /* Postpone a workqueue for deferred registration. */
 144         if (!dg00x->registered)
 145                 snd_fw_schedule_registration(unit, &dg00x->dwork);
 146
 147         snd_dg00x_transaction_reregister(dg00x);
 148
 149         /*
 150          * After registration, userspace can start packet streaming, then this
 151          * code block works fine.
 152          */
 153         if (dg00x->registered) {
 154                 mutex_lock(&dg00x->mutex);
 155                 snd_dg00x_stream_update_duplex(dg00x);
 156                 mutex_unlock(&dg00x->mutex);
 157         }
 158 }
 159
 160 static void snd_dg00x_remove(struct fw_unit *unit)
 161 {
 162         struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device);
 163
 164         /*
 165          * Confirm to stop the work for registration before the sound card is
 166          * going to be released. The work is not scheduled again because bus
 167          * reset handler is not called anymore.
 168          */
 169         cancel_delayed_work_sync(&dg00x->dwork);
 170
 171         if (dg00x->registered) {
 172                 /* No need to wait for releasing card object in this context. */
 173                 snd_card_free_when_closed(dg00x->card);
 174         } else {
 175                 /* Don't forget this case. */
 176                 dg00x_free(dg00x);
 177         }
 178 }
 179
 180 static const struct ieee1394_device_id snd_dg00x_id_table[] = {
 181         /* Both of 002/003 use the same ID. */
 182         {
 183                 .match_flags = IEEE1394_MATCH_VENDOR_ID |
 184                                IEEE1394_MATCH_MODEL_ID,
 185                 .vendor_id = VENDOR_DIGIDESIGN,
 186                 .model_id = MODEL_DIGI00X,
 187         },
 188         {}
 189 };
 190 MODULE_DEVICE_TABLE(ieee1394, snd_dg00x_id_table);
 191
 192 static struct fw_driver dg00x_driver = {
 193         .driver = {
 194                 .owner = THIS_MODULE,
 195                 .name = "snd-firewire-digi00x",
 196                 .bus = &fw_bus_type,
 197         },
 198         .probe    = snd_dg00x_probe,
 199         .update   = snd_dg00x_update,
 200         .remove   = snd_dg00x_remove,
 201         .id_table = snd_dg00x_id_table,
 202 };
 203
 204 static int __init snd_dg00x_init(void)
 205 {
 206         return driver_register(&dg00x_driver.driver);
 207 }
 208
 209 static void __exit snd_dg00x_exit(void)
 210 {
 211         driver_unregister(&dg00x_driver.driver);
 212 }
 213
 214 module_init(snd_dg00x_init);
 215 module_exit(snd_dg00x_exit);