digi00x-transaction.c

 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(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST,
45				  DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR,
46				  &data, sizeof(data), 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(&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(&dg00x->async_handler,
72					  &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}