cregit-Linux how code gets into the kernel

Release 4.8 sound/firewire/dice/dice.c

/*
 * TC Applied Technologies Digital Interface Communications Engine driver
 *
 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include "dice.h"

MODULE_DESCRIPTION("DICE driver");
MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
MODULE_LICENSE("GPL v2");


#define OUI_WEISS		0x001c6a

#define OUI_LOUD		0x000ff2

#define OUI_FOCUSRITE		0x00130e

#define OUI_TCELECTRONIC	0x001486


#define DICE_CATEGORY_ID	0x04

#define WEISS_CATEGORY_ID	0x00

#define LOUD_CATEGORY_ID	0x10

/*
 * Some models support several isochronous channels, while these streams are not
 * always available. In this case, add the model name to this list.
 */

static bool force_two_pcm_support(struct fw_unit *unit) { const char *const models[] = { /* TC Electronic models. */ "StudioKonnekt48", /* Focusrite models. */ "SAFFIRE_PRO_40", "LIQUID_SAFFIRE_56", "SAFFIRE_PRO_40_1", }; char model[32]; unsigned int i; int err; err = fw_csr_string(unit->directory, CSR_MODEL, model, sizeof(model)); if (err < 0) return false; for (i = 0; i < ARRAY_SIZE(models); i++) { if (strcmp(models[i], model) == 0) break; } return i < ARRAY_SIZE(models); }

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static int check_dice_category(struct fw_unit *unit) { struct fw_device *device = fw_parent_device(unit); struct fw_csr_iterator it; int key, val, vendor = -1, model = -1; unsigned int category; /* * Check that GUID and unit directory are constructed according to DICE * rules, i.e., that the specifier ID is the GUID's OUI, and that the * GUID chip ID consists of the 8-bit category ID, the 10-bit product * ID, and a 22-bit serial number. */ fw_csr_iterator_init(&it, unit->directory); while (fw_csr_iterator_next(&it, &key, &val)) { switch (key) { case CSR_SPECIFIER_ID: vendor = val; break; case CSR_MODEL: model = val; break; } } if (vendor == OUI_FOCUSRITE || vendor == OUI_TCELECTRONIC) { if (force_two_pcm_support(unit)) return 0; } if (vendor == OUI_WEISS) category = WEISS_CATEGORY_ID; else if (vendor == OUI_LOUD) category = LOUD_CATEGORY_ID; else category = DICE_CATEGORY_ID; if (device->config_rom[3] != ((vendor << 8) | category) || device->config_rom[4] >> 22 != model) return -ENODEV; return 0; }

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clemens ladischclemens ladisch13776.97%342.86%
takashi sakamototakashi sakamoto4123.03%457.14%
Total178100.00%7100.00%


static int check_clock_caps(struct snd_dice *dice) { __be32 value; int err; /* some very old firmwares don't tell about their clock support */ if (dice->clock_caps > 0) { err = snd_dice_transaction_read_global(dice, GLOBAL_CLOCK_CAPABILITIES, &value, 4); if (err < 0) return err; dice->clock_caps = be32_to_cpu(value); } else { /* this should be supported by any device */ dice->clock_caps = CLOCK_CAP_RATE_44100 | CLOCK_CAP_RATE_48000 | CLOCK_CAP_SOURCE_ARX1 | CLOCK_CAP_SOURCE_INTERNAL; } return 0; }

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clemens ladischclemens ladisch7392.41%457.14%
takashi sakamototakashi sakamoto67.59%342.86%
Total79100.00%7100.00%


static void dice_card_strings(struct snd_dice *dice) { struct snd_card *card = dice->card; struct fw_device *dev = fw_parent_device(dice->unit); char vendor[32], model[32]; unsigned int i; int err; strcpy(card->driver, "DICE"); strcpy(card->shortname, "DICE"); BUILD_BUG_ON(NICK_NAME_SIZE < sizeof(card->shortname)); err = snd_dice_transaction_read_global(dice, GLOBAL_NICK_NAME, card->shortname, sizeof(card->shortname)); if (err >= 0) { /* DICE strings are returned in "always-wrong" endianness */ BUILD_BUG_ON(sizeof(card->shortname) % 4 != 0); for (i = 0; i < sizeof(card->shortname); i += 4) swab32s((u32 *)&card->shortname[i]); card->shortname[sizeof(card->shortname) - 1] = '\0'; } strcpy(vendor, "?"); fw_csr_string(dev->config_rom + 5, CSR_VENDOR, vendor, sizeof(vendor)); strcpy(model, "?"); fw_csr_string(dice->unit->directory, CSR_MODEL, model, sizeof(model)); snprintf(card->longname, sizeof(card->longname), "%s %s (serial %u) at %s, S%d", vendor, model, dev->config_rom[4] & 0x3fffff, dev_name(&dice->unit->device), 100 << dev->max_speed); strcpy(card->mixername, "DICE"); }

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clemens ladischclemens ladisch26595.67%250.00%
takashi sakamototakashi sakamoto124.33%250.00%
Total277100.00%4100.00%


static void dice_free(struct snd_dice *dice) { snd_dice_stream_destroy_duplex(dice); snd_dice_transaction_destroy(dice); fw_unit_put(dice->unit); mutex_destroy(&dice->mutex); kfree(dice); }

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takashi sakamototakashi sakamoto3687.80%480.00%
clemens ladischclemens ladisch512.20%120.00%
Total41100.00%5100.00%

/* * This module releases the FireWire unit data after all ALSA character devices * are released by applications. This is for releasing stream data or finishing * transactions safely. Thus at returning from .remove(), this module still keep * references for the unit. */
static void dice_card_free(struct snd_card *card) { dice_free(card->private_data); }

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Total18100.00%2100.00%


static void do_registration(struct work_struct *work) { struct snd_dice *dice = container_of(work, struct snd_dice, dwork.work); int err; if (dice->registered) return; err = snd_card_new(&dice->unit->device, -1, NULL, THIS_MODULE, 0, &dice->card); if (err < 0) return; if (force_two_pcm_support(dice->unit)) dice->force_two_pcms = true; err = snd_dice_transaction_init(dice); if (err < 0) goto error; err = check_clock_caps(dice); if (err < 0) goto error; dice_card_strings(dice); err = snd_dice_stream_init_duplex(dice); if (err < 0) goto error; snd_dice_create_proc(dice); err = snd_dice_create_pcm(dice); if (err < 0) goto error; err = snd_dice_create_midi(dice); if (err < 0) goto error; err = snd_dice_create_hwdep(dice); if (err < 0) goto error; err = snd_card_register(dice->card); if (err < 0) goto error; /* * After registered, dice instance can be released corresponding to * releasing the sound card instance. */ dice->card->private_free = dice_card_free; dice->card->private_data = dice; dice->registered = true; return; error: snd_dice_stream_destroy_duplex(dice); snd_dice_transaction_destroy(dice); snd_dice_stream_destroy_duplex(dice); snd_card_free(dice->card); dev_info(&dice->unit->device, "Sound card registration failed: %d\n", err); }

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takashi iwaitakashi iwai62.21%17.14%
Total272100.00%14100.00%


static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id) { struct snd_dice *dice; int err; err = check_dice_category(unit); if (err < 0) return -ENODEV; /* Allocate this independent of sound card instance. */ dice = kzalloc(sizeof(struct snd_dice), GFP_KERNEL); if (dice == NULL) return -ENOMEM; dice->unit = fw_unit_get(unit); dev_set_drvdata(&unit->device, dice); spin_lock_init(&dice->lock); mutex_init(&dice->mutex); init_completion(&dice->clock_accepted); init_waitqueue_head(&dice->hwdep_wait); /* Allocate and register this sound card later. */ INIT_DEFERRABLE_WORK(&dice->dwork, do_registration); snd_fw_schedule_registration(unit, &dice->dwork); return 0; }

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takashi sakamototakashi sakamoto11782.98%375.00%
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Total141100.00%4100.00%


static void dice_remove(struct fw_unit *unit) { struct snd_dice *dice = dev_get_drvdata(&unit->device); /* * Confirm to stop the work for registration before the sound card is * going to be released. The work is not scheduled again because bus * reset handler is not called anymore. */ cancel_delayed_work_sync(&dice->dwork); if (dice->registered) { /* No need to wait for releasing card object in this context. */ snd_card_free_when_closed(dice->card); } else { /* Don't forget this case. */ dice_free(dice); } }

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clemens ladischclemens ladisch3051.72%125.00%
takashi sakamototakashi sakamoto2848.28%375.00%
Total58100.00%4100.00%


static void dice_bus_reset(struct fw_unit *unit) { struct snd_dice *dice = dev_get_drvdata(&unit->device); /* Postpone a workqueue for deferred registration. */ if (!dice->registered) snd_fw_schedule_registration(unit, &dice->dwork); /* The handler address register becomes initialized. */ snd_dice_transaction_reinit(dice); /* * After registration, userspace can start packet streaming, then this * code block works fine. */ if (dice->registered) { mutex_lock(&dice->mutex); snd_dice_stream_update_duplex(dice); mutex_unlock(&dice->mutex); } }

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clemens ladischclemens ladisch4152.56%225.00%
takashi sakamototakashi sakamoto3544.87%562.50%
stefan richterstefan richter22.56%112.50%
Total78100.00%8100.00%

#define DICE_INTERFACE 0x000001 static const struct ieee1394_device_id dice_id_table[] = { { .match_flags = IEEE1394_MATCH_VERSION, .version = DICE_INTERFACE, }, /* M-Audio Profire 610/2626 has a different value in version field. */ { .match_flags = IEEE1394_MATCH_VENDOR_ID | IEEE1394_MATCH_SPECIFIER_ID, .vendor_id = 0x000d6c, .specifier_id = 0x000d6c, }, { } }; MODULE_DEVICE_TABLE(ieee1394, dice_id_table); static struct fw_driver dice_driver = { .driver = { .owner = THIS_MODULE, .name = KBUILD_MODNAME, .bus = &fw_bus_type, }, .probe = dice_probe, .update = dice_bus_reset, .remove = dice_remove, .id_table = dice_id_table, };
static int __init alsa_dice_init(void) { return driver_register(&dice_driver.driver); }

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static void __exit alsa_dice_exit(void) { driver_unregister(&dice_driver.driver); }

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module_init(alsa_dice_init); module_exit(alsa_dice_exit);

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takashi sakamototakashi sakamoto59340.92%1557.69%
takashi iwaitakashi iwai60.41%13.85%
stefan richterstefan richter20.14%13.85%
Total1449100.00%26100.00%
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