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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2015-12-22 09:15:40 +0900
committerTakashi Iwai <tiwai@suse.de>2015-12-22 11:51:28 +0100
commite3315b439c30c208582ac64e58f0c0d36b83181e (patch)
tree71df935593f542fa023268074782d46f0c576759 /sound/firewire/oxfw
parent3f47152a1c8f4d4c8ca18740bf3f1a7fff1b3fd9 (diff)
downloadlinux-e3315b439c30c208582ac64e58f0c0d36b83181e.tar.bz2
ALSA: oxfw: allocate own address region for SCS.1 series
When physical controls on SCS.1 models are operated, the models transfer MIDI messages in asynchronous transactions on IEEE 1394 bus. The models have a register to have an address for the transactions, and drivers can register own address for this purpose. This commit keeps a region of address, registers it and adds a handler for the transactions. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/oxfw')
-rw-r--r--sound/firewire/oxfw/oxfw-scs1x.c65
-rw-r--r--sound/firewire/oxfw/oxfw.h1
2 files changed, 65 insertions, 1 deletions
diff --git a/sound/firewire/oxfw/oxfw-scs1x.c b/sound/firewire/oxfw/oxfw-scs1x.c
index 34db0d0957c5..32a7b673cbc8 100644
--- a/sound/firewire/oxfw/oxfw-scs1x.c
+++ b/sound/firewire/oxfw/oxfw-scs1x.c
@@ -9,18 +9,81 @@
#include "oxfw.h"
+#define HSS1394_ADDRESS 0xc007dedadadaULL
+#define HSS1394_MAX_PACKET_SIZE 64
+#define HSS1394_TAG_CHANGE_ADDRESS 0xf1
+
+struct fw_scs1x {
+ struct fw_address_handler hss_handler;
+};
+
+static void handle_hss(struct fw_card *card, struct fw_request *request,
+ int tcode, int destination, int source, int generation,
+ unsigned long long offset, void *data, size_t length,
+ void *callback_data)
+{
+ fw_send_response(card, request, RCODE_COMPLETE);
+}
+
+static int register_address(struct snd_oxfw *oxfw)
+{
+ struct fw_scs1x *scs = oxfw->spec;
+ __be64 data;
+
+ data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) |
+ scs->hss_handler.offset);
+ return snd_fw_transaction(oxfw->unit, TCODE_WRITE_BLOCK_REQUEST,
+ HSS1394_ADDRESS, &data, sizeof(data), 0);
+}
+
+static void remove_scs1x(struct snd_rawmidi *rmidi)
+{
+ struct fw_scs1x *scs = rmidi->private_data;
+
+ fw_core_remove_address_handler(&scs->hss_handler);
+}
+
+void snd_oxfw_scs1x_update(struct snd_oxfw *oxfw)
+{
+ register_address(oxfw);
+}
+
int snd_oxfw_scs1x_add(struct snd_oxfw *oxfw)
{
struct snd_rawmidi *rmidi;
+ struct fw_scs1x *scs;
int err;
+ scs = kzalloc(sizeof(struct fw_scs1x), GFP_KERNEL);
+ if (scs == NULL)
+ return -ENOMEM;
+ oxfw->spec = scs;
+
+ /* Allocate own handler for imcoming asynchronous transaction. */
+ scs->hss_handler.length = HSS1394_MAX_PACKET_SIZE;
+ scs->hss_handler.address_callback = handle_hss;
+ scs->hss_handler.callback_data = scs;
+ err = fw_core_add_address_handler(&scs->hss_handler,
+ &fw_high_memory_region);
+ if (err < 0)
+ return err;
+
+ err = register_address(oxfw);
+ if (err < 0)
+ goto err_allocated;
+
/* Use unique name for backward compatibility to scs1x module. */
err = snd_rawmidi_new(oxfw->card, "SCS.1x", 0, 0, 0, &rmidi);
if (err < 0)
- return err;
+ goto err_allocated;
+ rmidi->private_data = scs;
+ rmidi->private_free = remove_scs1x;
snprintf(rmidi->name, sizeof(rmidi->name),
"%s MIDI", oxfw->card->shortname);
+ return 0;
+err_allocated:
+ fw_core_remove_address_handler(&scs->hss_handler);
return err;
}
diff --git a/sound/firewire/oxfw/oxfw.h b/sound/firewire/oxfw/oxfw.h
index cbf00eee678c..9beecc214767 100644
--- a/sound/firewire/oxfw/oxfw.h
+++ b/sound/firewire/oxfw/oxfw.h
@@ -135,3 +135,4 @@ int snd_oxfw_create_hwdep(struct snd_oxfw *oxfw);
int snd_oxfw_add_spkr(struct snd_oxfw *oxfw, bool is_lacie);
int snd_oxfw_scs1x_add(struct snd_oxfw *oxfw);
+void snd_oxfw_scs1x_update(struct snd_oxfw *oxfw);