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	unsigned long flags;
15
16	spin_lock_irqsave(&dg00x->lock, flags);
17	dg00x->msg = be32_to_cpu(*buf);
18	spin_unlock_irqrestore(&dg00x->lock, flags);
19
20	wake_up(&dg00x->hwdep_wait);
21}
22
23static void handle_message(struct fw_card *card, struct fw_request *request,
24			   int tcode, int destination, int source,
25			   int generation, unsigned long long offset,
26			   void *data, size_t length, void *callback_data)
27{
28	struct snd_dg00x *dg00x = callback_data;
29	__be32 *buf = (__be32 *)data;
30
31	fw_send_response(card, request, RCODE_COMPLETE);
32
33	if (offset == dg00x->async_handler.offset)
34		handle_unknown_message(dg00x, offset, buf);
35}
36
37int snd_dg00x_transaction_reregister(struct snd_dg00x *dg00x)
38{
39	struct fw_device *device = fw_parent_device(dg00x->unit);
40	__be32 data[2];
41
42	/* Unknown. 4bytes. */
43	data[0] = cpu_to_be32((device->card->node_id << 16) |
44			      (dg00x->async_handler.offset >> 32));
45	data[1] = cpu_to_be32(dg00x->async_handler.offset);
46	return snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST,
47				  DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR,
48				  &data, sizeof(data), 0);
49}
50
51void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x)
52{
53	if (dg00x->async_handler.callback_data == NULL)
54		return;
55
56	fw_core_remove_address_handler(&dg00x->async_handler);
57
58	dg00x->async_handler.callback_data = NULL;
59}
60
61int snd_dg00x_transaction_register(struct snd_dg00x *dg00x)
62{
63	static const struct fw_address_region resp_register_region = {
64		.start	= 0xffffe0000000ull,
65		.end	= 0xffffe000ffffull,
66	};
67	int err;
68
69	dg00x->async_handler.length = 4;
70	dg00x->async_handler.address_callback = handle_message;
71	dg00x->async_handler.callback_data = dg00x;
72
73	err = fw_core_add_address_handler(&dg00x->async_handler,
74					  &resp_register_region);
75	if (err < 0)
76		return err;
77
78	err = snd_dg00x_transaction_reregister(dg00x);
79	if (err < 0)
80		snd_dg00x_transaction_unregister(dg00x);
81
82	return err;
83}
84