1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * digi00x-transaction.c - a part of driver for Digidesign Digi 002/003 family
4 *
5 * Copyright (c) 2014-2015 Takashi Sakamoto
6 */
7
8#include <sound/asound.h>
9#include "digi00x.h"
10
11static void handle_unknown_message(struct snd_dg00x *dg00x,
12 unsigned long long offset, __be32 *buf)
13{
14 scoped_guard(spinlock_irqsave, &dg00x->lock) {
15 dg00x->msg = be32_to_cpu(*buf);
16 }
17
18 wake_up(&dg00x->hwdep_wait);
19}
20
21static void handle_message(struct fw_card *card, struct fw_request *request,
22 int tcode, int destination, int source,
23 int generation, unsigned long long offset,
24 void *data, size_t length, void *callback_data)
25{
26 struct snd_dg00x *dg00x = callback_data;
27 __be32 *buf = (__be32 *)data;
28
29 fw_send_response(card, request, RCODE_COMPLETE);
30
31 if (offset == dg00x->async_handler.offset)
32 handle_unknown_message(dg00x, offset, buf);
33}
34
35int snd_dg00x_transaction_reregister(struct snd_dg00x *dg00x)
36{
37 struct fw_device *device = fw_parent_device(dg00x->unit);
38 __be32 data[2];
39
40 /* Unknown. 4bytes. */
41 data[0] = cpu_to_be32((device->card->node_id << 16) |
42 (dg00x->async_handler.offset >> 32));
43 data[1] = cpu_to_be32(dg00x->async_handler.offset);
44 return snd_fw_transaction(unit: dg00x->unit, TCODE_WRITE_BLOCK_REQUEST,
45 DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR,
46 buffer: &data, length: sizeof(data), flags: 0);
47}
48
49void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x)
50{
51 if (dg00x->async_handler.callback_data == NULL)
52 return;
53
54 fw_core_remove_address_handler(handler: &dg00x->async_handler);
55
56 dg00x->async_handler.callback_data = NULL;
57}
58
59int snd_dg00x_transaction_register(struct snd_dg00x *dg00x)
60{
61 static const struct fw_address_region resp_register_region = {
62 .start = 0xffffe0000000ull,
63 .end = 0xffffe000ffffull,
64 };
65 int err;
66
67 dg00x->async_handler.length = 4;
68 dg00x->async_handler.address_callback = handle_message;
69 dg00x->async_handler.callback_data = dg00x;
70
71 err = fw_core_add_address_handler(handler: &dg00x->async_handler,
72 region: &resp_register_region);
73 if (err < 0)
74 return err;
75
76 err = snd_dg00x_transaction_reregister(dg00x);
77 if (err < 0)
78 snd_dg00x_transaction_unregister(dg00x);
79
80 return err;
81}
82

source code of linux/sound/firewire/digi00x/digi00x-transaction.c