commit e65e2cb99e44704f63b76e4395092b0533bef88b
author Takashi Sakamoto <o-takashi@sakamocchi.jp> Mon Oct 12 19:10:24 2015 +0900
committer Takashi Iwai <tiwai@suse.de> Mon Oct 12 14:16:19 2015 +0200
tree b09144d2b84fabb0adb84c0bf5e90debb4d96447
parent 0db18e7eec40a4331214185b37b0440856856775

ALSA: firewire-tascam: Turn on/off FireWire LED

TASCAM FireWire series has some LEDs on its surface. These LEDs can be
turned on/off by receiving asynchronous transactions to a certain
address. One of the LEDs is labels as 'FireWire'. It's better to light it
up when this driver starts to work. Besides, the LED for 'FireWire' is
turned off at bus reset.

This commit implements this idea.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/tascam/tascam-transaction.c

diff --git a/sound/firewire/tascam/tascam-transaction.c b/sound/firewire/tascam/tascam-transaction.c
index 6b74fb5..1c9a88b 100644
--- a/sound/firewire/tascam/tascam-transaction.c
+++ b/sound/firewire/tascam/tascam-transaction.c
@@ -252,6 +252,14 @@
 	return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
 				  TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ON,
 				  &reg, sizeof(reg), 0);
+	if (err < 0)
+		return err;
+
+	/* Turn on FireWire LED. */
+	reg = cpu_to_be32(0x0001008e);
+	return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
+				  TSCM_ADDR_BASE + TSCM_OFFSET_LED_POWER,
+				  &reg, sizeof(reg), 0);
 }
 
 void snd_tscm_transaction_unregister(struct snd_tscm *tscm)
@@ -259,6 +267,12 @@
 	__be32 reg;
 	unsigned int i;
 
+	/* Turn off FireWire LED. */
+	reg = cpu_to_be32(0x0000008e);
+	snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
+			   TSCM_ADDR_BASE + TSCM_OFFSET_LED_POWER,
+			   &reg, sizeof(reg), 0);
+
 	/* Turn off messaging. */
 	reg = cpu_to_be32(0x00000000);
 	snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,