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ALSA: dice: get clock capabilities 

In preparation for sample rate selection support, ensure that the driver
knows about the device's clock capabilities.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2011-12-04 21:47:00 +01:00
parent c5280e996f
commit a0301998ae
1 changed files with 21 additions and 2 deletions
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23
sound/firewire/dice.c
View File

@ -36,6 +36,7 @@ struct dice {
struct mutex mutex;
unsigned int global_offset;
unsigned int rx_offset;
unsigned int clock_caps;
struct fw_address_handler notification_handler;
int owner_generation;
int dev_lock_count; /* > 0 driver, < 0 userspace */
@ -830,9 +831,10 @@ static int dice_interface_check(struct fw_unit *unit)
return 0;
}
static int dice_init_offsets(struct dice *dice)
static int dice_read_params(struct dice *dice)
{
__be32 pointers[6];
__be32 value;
int err;
err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,
@ -844,6 +846,23 @@ static int dice_init_offsets(struct dice *dice)
dice->global_offset = be32_to_cpu(pointers[0]) * 4;
dice->rx_offset = be32_to_cpu(pointers[4]) * 4;
/* some very old firmwares don't tell about their clock support */
if (be32_to_cpu(pointers[1]) * 4 >= GLOBAL_CLOCK_CAPABILITIES + 4) {
err = snd_fw_transaction(
dice->unit, TCODE_READ_QUADLET_REQUEST,
global_address(dice, GLOBAL_CLOCK_CAPABILITIES),
&value, 4, 0);
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;
}
@ -905,7 +924,7 @@ static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
dice->unit = unit;
init_waitqueue_head(&dice->hwdep_wait);
err = dice_init_offsets(dice);
err = dice_read_params(dice);
if (err < 0)
goto err_mutex;