sound/firewire/digi00x/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
  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 }