sound/firewire/digi00x/digi00x-transaction.c

   1 /*
   2  * digi00x-transaction.c - a part of driver for Digidesign Digi 002/003 family
   3  *
   4  * Copyright (c) 2014-2015 Takashi Sakamoto
   5  *
   6  * Licensed under the terms of the GNU General Public License, version 2.
   7  */
   8
   9 #include <sound/asound.h>
  10 #include "digi00x.h"
  11
  12 static void handle_unknown_message(struct snd_dg00x *dg00x,
  13                                    unsigned long long offset, __be32 *buf)
  14 {
  15         unsigned long flags;
  16
  17         spin_lock_irqsave(&dg00x->lock, flags);
  18         dg00x->msg = be32_to_cpu(*buf);
  19         spin_unlock_irqrestore(&dg00x->lock, flags);
  20
  21         wake_up(&dg00x->hwdep_wait);
  22 }
  23
  24 static void handle_message(struct fw_card *card, struct fw_request *request,
  25                            int tcode, int destination, int source,
  26                            int generation, unsigned long long offset,
  27                            void *data, size_t length, void *callback_data)
  28 {
  29         struct snd_dg00x *dg00x = callback_data;
  30         __be32 *buf = (__be32 *)data;
  31
  32         fw_send_response(card, request, RCODE_COMPLETE);
  33
  34         if (offset == dg00x->async_handler.offset)
  35                 handle_unknown_message(dg00x, offset, buf);
  36 }
  37
  38 int snd_dg00x_transaction_reregister(struct snd_dg00x *dg00x)
  39 {
  40         struct fw_device *device = fw_parent_device(dg00x->unit);
  41         __be32 data[2];
  42
  43         /* Unknown. 4bytes. */
  44         data[0] = cpu_to_be32((device->card->node_id << 16) |
  45                               (dg00x->async_handler.offset >> 32));
  46         data[1] = cpu_to_be32(dg00x->async_handler.offset);
  47         return snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST,
  48                                   DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR,
  49                                   &data, sizeof(data), 0);
  50 }
  51
  52 void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x)
  53 {
  54         if (dg00x->async_handler.callback_data == NULL)
  55                 return;
  56
  57         fw_core_remove_address_handler(&dg00x->async_handler);
  58
  59         dg00x->async_handler.callback_data = NULL;
  60 }
  61
  62 int snd_dg00x_transaction_register(struct snd_dg00x *dg00x)
  63 {
  64         static const struct fw_address_region resp_register_region = {
  65                 .start  = 0xffffe0000000ull,
  66                 .end    = 0xffffe000ffffull,
  67         };
  68         int err;
  69
  70         dg00x->async_handler.length = 4;
  71         dg00x->async_handler.address_callback = handle_message;
  72         dg00x->async_handler.callback_data = dg00x;
  73
  74         err = fw_core_add_address_handler(&dg00x->async_handler,
  75                                           &resp_register_region);
  76         if (err < 0)
  77                 return err;
  78
  79         err = snd_dg00x_transaction_reregister(dg00x);
  80         if (err < 0)
  81                 snd_dg00x_transaction_unregister(dg00x);
  82
  83         return err;
  84 }