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| author | Clemens Ladisch <clemens@ladisch.de> | 2011-12-04 21:47:00 +0100 |
|---|---|---|
| committer | Clemens Ladisch <clemens@ladisch.de> | 2013-10-20 22:07:57 +0200 |
| commit | a0301998aeebad206fa7e1b77300c9961c8c3d12 (patch) | |
| tree | 5e2960ea479fa0dd4e99bb47e6a470a7ec06bf5e /sound | |
| parent | ALSA: dice: make amdtp_rates[] const (diff) | |
| download | linux-a0301998aeebad206fa7e1b77300c9961c8c3d12.tar.xz linux-a0301998aeebad206fa7e1b77300c9961c8c3d12.zip | |
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>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/firewire/dice.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c index 2d3a04ef9840..06fef4752d50 100644 --- a/sound/firewire/dice.c +++ b/sound/firewire/dice.c @@ -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; |