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ALSA: dice: fix device detection for other vendors 

DICE devices do not have a unique specifier ID in their unit directory
(it's always the same as the device vendor's ID), so rely on just the
version ID for driver loading, and use a heuristic in the probe callback
to detect actual DICE devices.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2011-09-04 22:16:02 +02:00
parent 54e72f0ba3
commit cbab328ddc
1 changed files with 84 additions and 18 deletions
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102
sound/firewire/dice.c
View File

@ -827,28 +827,93 @@ static void dice_card_free(struct snd_card *card)
mutex_destroy(&dice->mutex);
}
#define DICE_CATEGORY_ID 0x04
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, value, vendor = -1, model = -1, err;
unsigned int i;
__be32 pointers[ARRAY_SIZE(min_values)];
__be32 version;
/*
* 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 DICE 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, &value)) {
switch (key) {
case CSR_SPECIFIER_ID:
vendor = value;
break;
case CSR_MODEL:
model = value;
break;
}
}
if (device->config_rom[3] != ((vendor << 8) | DICE_CATEGORY_ID) ||
device->config_rom[4] >> 22 != model)
return -ENODEV;
/*
* 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(pointers));
if (err < 0)
return -ENODEV;
for (i = 0; i < ARRAY_SIZE(pointers); ++i) {
value = be32_to_cpu(pointers[i]);
if (value < min_values[i] || value >= 0x40000)
return -ENODEV;
}
/*
* 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);
if (err < 0)
return -ENODEV;
if ((version & cpu_to_be32(0xff000000)) != cpu_to_be32(0x01000000)) {
dev_err(&unit->device,
"unknown DICE version: 0x%08x\n", be32_to_cpu(version));
return -ENODEV;
}
return 0;
}
static int dice_init_offsets(struct dice *dice)
{
__be32 pointers[6];
unsigned int global_size, rx_size;
int err;
err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,
DICE_PRIVATE_SPACE, &pointers, 6 * 4);
DICE_PRIVATE_SPACE,
pointers, sizeof(pointers));
if (err < 0)
return err;
dice->global_offset = be32_to_cpu(pointers[0]) * 4;
global_size = be32_to_cpu(pointers[1]);
dice->rx_offset = be32_to_cpu(pointers[4]) * 4;
rx_size = be32_to_cpu(pointers[5]);
/* some sanity checks to ensure that we actually have a DICE */
if (dice->global_offset < 10 * 4 || global_size < 0x168 / 4 ||
dice->rx_offset < 10 * 4 || rx_size < 0x120 / 4) {
dev_err(&dice->unit->device, "invalid register pointers\n");
return -ENXIO;
}
return 0;
}
@ -881,8 +946,8 @@ static void dice_card_strings(struct dice *dice)
strcpy(model, "?");
fw_csr_string(dice->unit->directory, CSR_MODEL, model, sizeof(model));
snprintf(card->longname, sizeof(card->longname),
"%s %s, GUID %08x%08x at %s, S%d",
vendor, model, dev->config_rom[3], dev->config_rom[4],
"%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");
@ -895,6 +960,10 @@ static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
__be32 clock_sel;
int err;
err = dice_interface_check(unit);
if (err < 0)
return err;
err = snd_card_create(-1, NULL, THIS_MODULE, sizeof(*dice), &card);
if (err < 0)
return err;
@ -1020,15 +1089,12 @@ static void dice_bus_reset(struct fw_unit *unit)
mutex_unlock(&dice->mutex);
}
#define TC_OUI 0x000166
#define DICE_INTERFACE 0x000001
static const struct ieee1394_device_id dice_id_table[] = {
{
.match_flags = IEEE1394_MATCH_SPECIFIER_ID |
IEEE1394_MATCH_VERSION,
.specifier_id = TC_OUI,
.version = DICE_INTERFACE,
.match_flags = IEEE1394_MATCH_VERSION,
.version = DICE_INTERFACE,
},
{ }
};