diff options
| -rw-r--r-- | sound/firewire/dice.c | 102 |
1 files changed, 84 insertions, 18 deletions
diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c index 1da1ddefd6a8..b4827ff45d68 100644 --- a/sound/firewire/dice.c +++ b/sound/firewire/dice.c @@ -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, }, { } }; |