- 根目录:
- 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 DICE_CATEGORY_ID 0x04
#define WEISS_CATEGORY_ID 0x00
#define LOUD_CATEGORY_ID 0x10
static int dice_interface_check(struct fw_unit *unit)
{
static const int min_values[10] = {
10, 0x64 / 4,
10, 0x18 / 4,
10, 0x18 / 4,
0, 0,
0, 0,
};
struct fw_device *device = fw_parent_device(unit);
struct fw_csr_iterator it;
int key, val, vendor = -1, model = -1, err;
unsigned int category, i;
__be32 *pointers;
u32 value;
__be32 version;
pointers = kmalloc_array(ARRAY_SIZE(min_values), sizeof(__be32),
GFP_KERNEL);
if (pointers == NULL)
return -ENOMEM;
/*
* 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_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) {
err = -ENODEV;
goto end;
}
/*
* Check that the sub address spaces exist and are located inside the
* private address space. The minimum values are chosen so that all
* minimally required registers are included.
*/
err = snd_fw_transaction(unit, TCODE_READ_BLOCK_REQUEST,
DICE_PRIVATE_SPACE, pointers,
sizeof(__be32) * ARRAY_SIZE(min_values), 0);
if (err < 0) {
err = -ENODEV;
goto end;
}
for (i = 0; i < ARRAY_SIZE(min_values); ++i) {
value = be32_to_cpu(pointers[i]);
if (value < min_values[i] || value >= 0x40000) {
err = -ENODEV;
goto end;
}
}
/*
* Check that the implemented DICE driver specification major version
* number matches.
*/
err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
DICE_PRIVATE_SPACE +
be32_to_cpu(pointers[0]) * 4 + GLOBAL_VERSION,
&version, 4, 0);
if (err < 0) {
err = -ENODEV;
goto end;
}
if ((version & cpu_to_be32(0xff000000)) != cpu_to_be32(0x01000000)) {
dev_err(&unit->device,
"unknown DICE version: 0x%08x\n", be32_to_cpu(version));
err = -ENODEV;
goto end;
}
end:
return err;
}
static int highest_supported_mode_rate(struct snd_dice *dice,
unsigned int mode, unsigned int *rate)
{
unsigned int i, m;
for (i = ARRAY_SIZE(snd_dice_rates); i > 0; i--) {
*rate = snd_dice_rates[i - 1];
if (snd_dice_stream_get_rate_mode(dice, *rate, &m) < 0)
continue;
if (mode == m)
break;
}
if (i == 0)
return -EINVAL;
return 0;
}
static int dice_read_mode_params(struct snd_dice *dice, unsigned int mode)
{
__be32 values[2];
unsigned int rate;
int err;
if (highest_supported_mode_rate(dice, mode, &rate) < 0) {
dice->tx_channels[mode] = 0;
dice->tx_midi_ports[mode] = 0;
dice->rx_channels[mode] = 0;
dice->rx_midi_ports[mode] = 0;
return 0;
}
err = snd_dice_transaction_set_rate(dice, rate);
if (err < 0)
return err;
err = snd_dice_transaction_read_tx(dice, TX_NUMBER_AUDIO,
values, sizeof(values));
if (err < 0)
return err;
dice->tx_channels[mode] = be32_to_cpu(values[0]);
dice->tx_midi_ports[mode] = be32_to_cpu(values[1]);
err = snd_dice_transaction_read_rx(dice, RX_NUMBER_AUDIO,
values, sizeof(values));
if (err < 0)
return err;
dice->rx_channels[mode] = be32_to_cpu(values[0]);
dice->rx_midi_ports[mode] = be32_to_cpu(values[1]);
return 0;
}
static int dice_read_params(struct snd_dice *dice)
{
__be32 value;
int mode, 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;
}
for (mode = 2; mode >= 0; --mode) {
err = dice_read_mode_params(dice, mode);
if (err < 0)
return err;
}
return 0;
}
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");
}
/*
* 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)
{
struct snd_dice *dice = card->private_data;
snd_dice_stream_destroy_duplex(dice);
snd_dice_transaction_destroy(dice);
fw_unit_put(dice->unit);
mutex_destroy(&dice->mutex);
}
static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
{
struct snd_card *card;
struct snd_dice *dice;
int err;
err = dice_interface_check(unit);
if (err < 0)
goto end;
err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
sizeof(*dice), &card);
if (err < 0)
goto end;
dice = card->private_data;
dice->card = card;
dice->unit = fw_unit_get(unit);
card->private_free = dice_card_free;
spin_lock_init(&dice->lock);
mutex_init(&dice->mutex);
init_completion(&dice->clock_accepted);
init_waitqueue_head(&dice->hwdep_wait);
err = snd_dice_transaction_init(dice);
if (err < 0)
goto error;
err = dice_read_params(dice);
if (err < 0)
goto error;
dice_card_strings(dice);
err = snd_dice_create_pcm(dice);
if (err < 0)
goto error;
err = snd_dice_create_hwdep(dice);
if (err < 0)
goto error;
snd_dice_create_proc(dice);
err = snd_dice_create_midi(dice);
if (err < 0)
goto error;
err = snd_dice_stream_init_duplex(dice);
if (err < 0)
goto error;
err = snd_card_register(card);
if (err < 0) {
snd_dice_stream_destroy_duplex(dice);
goto error;
}
dev_set_drvdata(&unit->device, dice);
end:
return err;
error:
snd_card_free(card);
return err;
}
static void dice_remove(struct fw_unit *unit)
{
struct snd_dice *dice = dev_get_drvdata(&unit->device);
/* No need to wait for releasing card object in this context. */
snd_card_free_when_closed(dice->card);
}
static void dice_bus_reset(struct fw_unit *unit)
{
struct snd_dice *dice = dev_get_drvdata(&unit->device);
/* The handler address register becomes initialized. */
snd_dice_transaction_reinit(dice);
mutex_lock(&dice->mutex);
snd_dice_stream_update_duplex(dice);
mutex_unlock(&dice->mutex);
}
#define DICE_INTERFACE 0x000001
static const struct ieee1394_device_id dice_id_table[] = {
{
.match_flags = IEEE1394_MATCH_VERSION,
.version = DICE_INTERFACE,
},
{ }
};
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);
}
static void __exit alsa_dice_exit(void)
{
driver_unregister(&dice_driver.driver);
}
module_init(alsa_dice_init);
module_exit(alsa_dice_exit);