X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=sound%2Ffirewire%2Fdice.c;fp=sound%2Ffirewire%2Fdice.c;h=6feee6614193a88d894c8f3e4f4942074523e4e6;hb=b20be8de1b3972ccf9af72850b045214faa8d830;hp=49d630ba2d9fbd3e8be1026daf72f366bfa514e0;hpb=a471fcde8c2c4b65f110bb4210af3513ee4deeb8;p=karo-tx-linux.git

diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c
index 49d630ba2d9f..6feee6614193 100644
--- a/sound/firewire/dice.c
+++ b/sound/firewire/dice.c
@@ -1128,6 +1128,7 @@ static int dice_interface_check(struct fw_unit *unit)
 	int key, value, vendor = -1, model = -1, err;
 	unsigned int category, i;
 	__be32 pointers[ARRAY_SIZE(min_values)];
+	__be32 tx_data[4];
 	__be32 version;
 
 	/*
@@ -1171,6 +1172,14 @@ static int dice_interface_check(struct fw_unit *unit)
 			return -ENODEV;
 	}
 
+	/* We support playback only. Let capture devices be handled by FFADO. */
+	err = snd_fw_transaction(unit, TCODE_READ_BLOCK_REQUEST,
+				 DICE_PRIVATE_SPACE +
+				 be32_to_cpu(pointers[2]) * 4,
+				 tx_data, sizeof(tx_data), 0);
+	if (err < 0 || (tx_data[0] && tx_data[3]))
+		return -ENODEV;
+
 	/*
 	 * Check that the implemented DICE driver specification major version
 	 * number matches.