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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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324540c4e0
Just after appearing on IEEE 1394 bus, this unit generates several bus resets. This is due to loading firmware from on-board flash memory and initialize hardware. It's better to postpone sound card registration. This commit schedules workqueue to process actual probe processing 2 seconds after the last bus-reset. The card instance is kept at unit probe callback and released at card free callback. Therefore, when the actual probe processing fails, the memory block is wasted. This is due to simplify driver implementation. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
154 lines
3.3 KiB
C
154 lines
3.3 KiB
C
/*
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* ff.c - a part of driver for RME Fireface series
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*
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* Copyright (c) 2015-2017 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 "ff.h"
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#define OUI_RME 0x000a35
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MODULE_DESCRIPTION("RME Fireface series 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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static void name_card(struct snd_ff *ff)
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{
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struct fw_device *fw_dev = fw_parent_device(ff->unit);
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const char *const model = "Fireface Skeleton";
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strcpy(ff->card->driver, "Fireface");
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strcpy(ff->card->shortname, model);
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strcpy(ff->card->mixername, model);
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snprintf(ff->card->longname, sizeof(ff->card->longname),
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"RME %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(&ff->unit->device), 100 << fw_dev->max_speed);
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}
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static void ff_free(struct snd_ff *ff)
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{
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fw_unit_put(ff->unit);
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mutex_destroy(&ff->mutex);
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kfree(ff);
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}
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static void ff_card_free(struct snd_card *card)
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{
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ff_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_ff *ff = container_of(work, struct snd_ff, dwork.work);
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int err;
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if (ff->registered)
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return;
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err = snd_card_new(&ff->unit->device, -1, NULL, THIS_MODULE, 0,
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&ff->card);
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if (err < 0)
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return;
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name_card(ff);
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err = snd_card_register(ff->card);
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if (err < 0)
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goto error;
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ff->card->private_free = ff_card_free;
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ff->card->private_data = ff;
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ff->registered = true;
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return;
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error:
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snd_card_free(ff->card);
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dev_info(&ff->unit->device,
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"Sound card registration failed: %d\n", err);
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}
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static int snd_ff_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_ff *ff;
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ff = kzalloc(sizeof(struct snd_ff), GFP_KERNEL);
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if (ff == NULL)
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return -ENOMEM;
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/* initialize myself */
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ff->unit = fw_unit_get(unit);
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dev_set_drvdata(&unit->device, ff);
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mutex_init(&ff->mutex);
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/* Register this sound card later. */
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INIT_DEFERRABLE_WORK(&ff->dwork, do_registration);
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snd_fw_schedule_registration(unit, &ff->dwork);
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return 0;
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}
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static void snd_ff_update(struct fw_unit *unit)
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{
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struct snd_ff *ff = dev_get_drvdata(&unit->device);
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/* Postpone a workqueue for deferred registration. */
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if (!ff->registered)
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snd_fw_schedule_registration(unit, &ff->dwork);
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}
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static void snd_ff_remove(struct fw_unit *unit)
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{
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struct snd_ff *ff = 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_work_sync(&ff->dwork.work);
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if (ff->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(ff->card);
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} else {
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/* Don't forget this case. */
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ff_free(ff);
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}
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}
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static const struct ieee1394_device_id snd_ff_id_table[] = {
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{}
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};
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MODULE_DEVICE_TABLE(ieee1394, snd_ff_id_table);
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static struct fw_driver ff_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "snd-fireface",
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.bus = &fw_bus_type,
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},
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.probe = snd_ff_probe,
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.update = snd_ff_update,
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.remove = snd_ff_remove,
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.id_table = snd_ff_id_table,
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};
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static int __init snd_ff_init(void)
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{
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return driver_register(&ff_driver.driver);
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}
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static void __exit snd_ff_exit(void)
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{
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driver_unregister(&ff_driver.driver);
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}
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module_init(snd_ff_init);
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module_exit(snd_ff_exit);
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