![Takashi Sakamoto](/assets/img/avatar_default.png)
When some digi00x units are connected sequentially, userspace applications are involved at bus-reset state on IEEE 1394 bus. In the state, any communications can be canceled. Therefore, sound card registration should be delayed till the bus gets calm. This commit achieves it. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
216 lines
4.9 KiB
C
216 lines
4.9 KiB
C
/*
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* digi00x.c - a part of driver for Digidesign Digi 002/003 family
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*
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* Copyright (c) 2014-2015 Takashi Sakamoto
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*
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include "digi00x.h"
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MODULE_DESCRIPTION("Digidesign Digi 002/003 family Driver");
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MODULE_AUTHOR("Takashi Sakamoto <o-takashi@sakamocchi.jp>");
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MODULE_LICENSE("GPL v2");
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#define VENDOR_DIGIDESIGN 0x00a07e
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#define MODEL_DIGI00X 0x000002
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static int name_card(struct snd_dg00x *dg00x)
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{
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struct fw_device *fw_dev = fw_parent_device(dg00x->unit);
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char name[32] = {0};
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char *model;
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int err;
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err = fw_csr_string(dg00x->unit->directory, CSR_MODEL, name,
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sizeof(name));
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if (err < 0)
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return err;
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model = skip_spaces(name);
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strcpy(dg00x->card->driver, "Digi00x");
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strcpy(dg00x->card->shortname, model);
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strcpy(dg00x->card->mixername, model);
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snprintf(dg00x->card->longname, sizeof(dg00x->card->longname),
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"Digidesign %s, GUID %08x%08x at %s, S%d", model,
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fw_dev->config_rom[3], fw_dev->config_rom[4],
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dev_name(&dg00x->unit->device), 100 << fw_dev->max_speed);
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return 0;
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}
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static void dg00x_free(struct snd_dg00x *dg00x)
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{
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snd_dg00x_stream_destroy_duplex(dg00x);
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snd_dg00x_transaction_unregister(dg00x);
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fw_unit_put(dg00x->unit);
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mutex_destroy(&dg00x->mutex);
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}
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static void dg00x_card_free(struct snd_card *card)
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{
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dg00x_free(card->private_data);
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}
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static void do_registration(struct work_struct *work)
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{
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struct snd_dg00x *dg00x =
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container_of(work, struct snd_dg00x, dwork.work);
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int err;
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if (dg00x->registered)
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return;
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err = snd_card_new(&dg00x->unit->device, -1, NULL, THIS_MODULE, 0,
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&dg00x->card);
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if (err < 0)
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return;
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err = name_card(dg00x);
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if (err < 0)
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goto error;
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err = snd_dg00x_stream_init_duplex(dg00x);
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if (err < 0)
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goto error;
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snd_dg00x_proc_init(dg00x);
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err = snd_dg00x_create_pcm_devices(dg00x);
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if (err < 0)
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goto error;
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err = snd_dg00x_create_midi_devices(dg00x);
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if (err < 0)
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goto error;
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err = snd_dg00x_create_hwdep_device(dg00x);
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if (err < 0)
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goto error;
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err = snd_dg00x_transaction_register(dg00x);
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if (err < 0)
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goto error;
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err = snd_card_register(dg00x->card);
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if (err < 0)
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goto error;
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dg00x->card->private_free = dg00x_card_free;
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dg00x->card->private_data = dg00x;
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dg00x->registered = true;
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return;
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error:
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snd_dg00x_transaction_unregister(dg00x);
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snd_dg00x_stream_destroy_duplex(dg00x);
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snd_card_free(dg00x->card);
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dev_info(&dg00x->unit->device,
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"Sound card registration failed: %d\n", err);
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}
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static int snd_dg00x_probe(struct fw_unit *unit,
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const struct ieee1394_device_id *entry)
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{
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struct snd_dg00x *dg00x;
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/* Allocate this independent of sound card instance. */
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dg00x = kzalloc(sizeof(struct snd_dg00x), GFP_KERNEL);
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if (dg00x == NULL)
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return -ENOMEM;
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dg00x->unit = fw_unit_get(unit);
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dev_set_drvdata(&unit->device, dg00x);
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mutex_init(&dg00x->mutex);
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spin_lock_init(&dg00x->lock);
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init_waitqueue_head(&dg00x->hwdep_wait);
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/* Allocate and register this sound card later. */
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INIT_DEFERRABLE_WORK(&dg00x->dwork, do_registration);
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snd_fw_schedule_registration(unit, &dg00x->dwork);
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return 0;
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}
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static void snd_dg00x_update(struct fw_unit *unit)
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{
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struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device);
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/* Postpone a workqueue for deferred registration. */
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if (!dg00x->registered)
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snd_fw_schedule_registration(unit, &dg00x->dwork);
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snd_dg00x_transaction_reregister(dg00x);
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/*
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* After registration, userspace can start packet streaming, then this
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* code block works fine.
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*/
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if (dg00x->registered) {
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mutex_lock(&dg00x->mutex);
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snd_dg00x_stream_update_duplex(dg00x);
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mutex_unlock(&dg00x->mutex);
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}
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}
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static void snd_dg00x_remove(struct fw_unit *unit)
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{
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struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device);
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/*
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* Confirm to stop the work for registration before the sound card is
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* going to be released. The work is not scheduled again because bus
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* reset handler is not called anymore.
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*/
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cancel_delayed_work_sync(&dg00x->dwork);
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if (dg00x->registered) {
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/* No need to wait for releasing card object in this context. */
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snd_card_free_when_closed(dg00x->card);
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} else {
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/* Don't forget this case. */
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dg00x_free(dg00x);
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}
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}
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static const struct ieee1394_device_id snd_dg00x_id_table[] = {
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/* Both of 002/003 use the same ID. */
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{
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.match_flags = IEEE1394_MATCH_VENDOR_ID |
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IEEE1394_MATCH_MODEL_ID,
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.vendor_id = VENDOR_DIGIDESIGN,
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.model_id = MODEL_DIGI00X,
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},
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{}
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};
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MODULE_DEVICE_TABLE(ieee1394, snd_dg00x_id_table);
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static struct fw_driver dg00x_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "snd-firewire-digi00x",
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.bus = &fw_bus_type,
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},
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.probe = snd_dg00x_probe,
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.update = snd_dg00x_update,
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.remove = snd_dg00x_remove,
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.id_table = snd_dg00x_id_table,
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};
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static int __init snd_dg00x_init(void)
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{
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return driver_register(&dg00x_driver.driver);
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}
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static void __exit snd_dg00x_exit(void)
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{
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driver_unregister(&dg00x_driver.driver);
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}
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module_init(snd_dg00x_init);
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module_exit(snd_dg00x_exit);
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