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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>
This commit is contained in:
Takashi Sakamoto 2015-12-22 09:15:40 +09:00 committed by Takashi Iwai
parent 3f47152a1c
commit e3315b439c
2 changed files with 65 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
sound/firewire/oxfw/oxfw-scs1x.c
View File

@ -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;
}

1
sound/firewire/oxfw/oxfw.h
View File

@ -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);