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
11 static 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
23 static 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
37 int 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
51 void 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
61 int 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
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