root/sound/firewire/digi00x/digi00x.c

DEFINITIONS

1. name_card
2. dg00x_card_free
3. do_registration
4. snd_dg00x_probe
5. snd_dg00x_update
6. snd_dg00x_remove
7. snd_dg00x_init
8. snd_dg00x_exit

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * digi00x.c - a part of driver for Digidesign Digi 002/003 family
   4  *
   5  * Copyright (c) 2014-2015 Takashi Sakamoto
   6  */
   7 
   8 #include "digi00x.h"
   9 
  10 MODULE_DESCRIPTION("Digidesign Digi 002/003 family Driver");
  11 MODULE_AUTHOR("Takashi Sakamoto <o-takashi@sakamocchi.jp>");
  12 MODULE_LICENSE("GPL v2");
  13 
  14 #define VENDOR_DIGIDESIGN       0x00a07e
  15 #define MODEL_CONSOLE           0x000001
  16 #define MODEL_RACK              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_card_free(struct snd_card *card)
  44 {
  45         struct snd_dg00x *dg00x = card->private_data;
  46 
  47         snd_dg00x_stream_destroy_duplex(dg00x);
  48         snd_dg00x_transaction_unregister(dg00x);
  49 }
  50 
  51 static void do_registration(struct work_struct *work)
  52 {
  53         struct snd_dg00x *dg00x =
  54                         container_of(work, struct snd_dg00x, dwork.work);
  55         int err;
  56 
  57         if (dg00x->registered)
  58                 return;
  59 
  60         err = snd_card_new(&dg00x->unit->device, -1, NULL, THIS_MODULE, 0,
  61                            &dg00x->card);
  62         if (err < 0)
  63                 return;
  64         dg00x->card->private_free = dg00x_card_free;
  65         dg00x->card->private_data = dg00x;
  66 
  67         err = name_card(dg00x);
  68         if (err < 0)
  69                 goto error;
  70 
  71         err = snd_dg00x_stream_init_duplex(dg00x);
  72         if (err < 0)
  73                 goto error;
  74 
  75         snd_dg00x_proc_init(dg00x);
  76 
  77         err = snd_dg00x_create_pcm_devices(dg00x);
  78         if (err < 0)
  79                 goto error;
  80 
  81         err = snd_dg00x_create_midi_devices(dg00x);
  82         if (err < 0)
  83                 goto error;
  84 
  85         err = snd_dg00x_create_hwdep_device(dg00x);
  86         if (err < 0)
  87                 goto error;
  88 
  89         err = snd_dg00x_transaction_register(dg00x);
  90         if (err < 0)
  91                 goto error;
  92 
  93         err = snd_card_register(dg00x->card);
  94         if (err < 0)
  95                 goto error;
  96 
  97         dg00x->registered = true;
  98 
  99         return;
 100 error:
 101         snd_card_free(dg00x->card);
 102         dev_info(&dg00x->unit->device,
 103                  "Sound card registration failed: %d\n", err);
 104 }
 105 
 106 static int snd_dg00x_probe(struct fw_unit *unit,
 107                            const struct ieee1394_device_id *entry)
 108 {
 109         struct snd_dg00x *dg00x;
 110 
 111         /* Allocate this independent of sound card instance. */
 112         dg00x = devm_kzalloc(&unit->device, sizeof(struct snd_dg00x),
 113                              GFP_KERNEL);
 114         if (!dg00x)
 115                 return -ENOMEM;
 116 
 117         dg00x->unit = fw_unit_get(unit);
 118         dev_set_drvdata(&unit->device, dg00x);
 119 
 120         mutex_init(&dg00x->mutex);
 121         spin_lock_init(&dg00x->lock);
 122         init_waitqueue_head(&dg00x->hwdep_wait);
 123 
 124         dg00x->is_console = entry->model_id == MODEL_CONSOLE;
 125 
 126         /* Allocate and register this sound card later. */
 127         INIT_DEFERRABLE_WORK(&dg00x->dwork, do_registration);
 128         snd_fw_schedule_registration(unit, &dg00x->dwork);
 129 
 130         return 0;
 131 }
 132 
 133 static void snd_dg00x_update(struct fw_unit *unit)
 134 {
 135         struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device);
 136 
 137         /* Postpone a workqueue for deferred registration. */
 138         if (!dg00x->registered)
 139                 snd_fw_schedule_registration(unit, &dg00x->dwork);
 140 
 141         snd_dg00x_transaction_reregister(dg00x);
 142 
 143         /*
 144          * After registration, userspace can start packet streaming, then this
 145          * code block works fine.
 146          */
 147         if (dg00x->registered) {
 148                 mutex_lock(&dg00x->mutex);
 149                 snd_dg00x_stream_update_duplex(dg00x);
 150                 mutex_unlock(&dg00x->mutex);
 151         }
 152 }
 153 
 154 static void snd_dg00x_remove(struct fw_unit *unit)
 155 {
 156         struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device);
 157 
 158         /*
 159          * Confirm to stop the work for registration before the sound card is
 160          * going to be released. The work is not scheduled again because bus
 161          * reset handler is not called anymore.
 162          */
 163         cancel_delayed_work_sync(&dg00x->dwork);
 164 
 165         if (dg00x->registered) {
 166                 // Block till all of ALSA character devices are released.
 167                 snd_card_free(dg00x->card);
 168         }
 169 
 170         mutex_destroy(&dg00x->mutex);
 171         fw_unit_put(dg00x->unit);
 172 }
 173 
 174 static const struct ieee1394_device_id snd_dg00x_id_table[] = {
 175         /* Both of 002/003 use the same ID. */
 176         {
 177                 .match_flags = IEEE1394_MATCH_VENDOR_ID |
 178                                IEEE1394_MATCH_MODEL_ID,
 179                 .vendor_id = VENDOR_DIGIDESIGN,
 180                 .model_id = MODEL_CONSOLE,
 181         },
 182         {
 183                 .match_flags = IEEE1394_MATCH_VENDOR_ID |
 184                                IEEE1394_MATCH_MODEL_ID,
 185                 .vendor_id = VENDOR_DIGIDESIGN,
 186                 .model_id = MODEL_RACK,
 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);