cregit-Linux how code gets into the kernel

Release 4.7 sound/firewire/digi00x/digi00x-transaction.c

/*
 * digi00x-transaction.c - a part of driver for Digidesign Digi 002/003 family
 *
 * Copyright (c) 2014-2015 Takashi Sakamoto
 *
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include <sound/asound.h>
#include "digi00x.h"


static int fill_midi_message(struct snd_rawmidi_substream *substream, u8 *buf) { int bytes; buf[0] = 0x80; bytes = snd_rawmidi_transmit_peek(substream, buf + 1, 2); if (bytes >= 0) buf[3] = 0xc0 | bytes; return bytes; }

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takashi sakamototakashi sakamoto56100.00%1100.00%
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static void handle_midi_control(struct snd_dg00x *dg00x, __be32 *buf, unsigned int length) { struct snd_rawmidi_substream *substream; unsigned int i; unsigned int len; u8 *b; substream = ACCESS_ONCE(dg00x->in_control); if (substream == NULL) return; length /= 4; for (i = 0; i < length; i++) { b = (u8 *)&buf[i]; len = b[3] & 0xf; if (len > 0) snd_rawmidi_receive(dg00x->in_control, b + 1, len); } }

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takashi sakamototakashi sakamoto111100.00%1100.00%
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static void handle_unknown_message(struct snd_dg00x *dg00x, unsigned long long offset, __be32 *buf) { unsigned long flags; spin_lock_irqsave(&dg00x->lock, flags); dg00x->msg = be32_to_cpu(*buf); spin_unlock_irqrestore(&dg00x->lock, flags); wake_up(&dg00x->hwdep_wait); }

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takashi sakamototakashi sakamoto62100.00%1100.00%
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static void handle_message(struct fw_card *card, struct fw_request *request, int tcode, int destination, int source, int generation, unsigned long long offset, void *data, size_t length, void *callback_data) { struct snd_dg00x *dg00x = callback_data; __be32 *buf = (__be32 *)data; if (offset == dg00x->async_handler.offset) handle_unknown_message(dg00x, offset, buf); else if (offset == dg00x->async_handler.offset + 4) handle_midi_control(dg00x, buf, length); fw_send_response(card, request, RCODE_COMPLETE); }

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takashi sakamototakashi sakamoto111100.00%2100.00%
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int snd_dg00x_transaction_reregister(struct snd_dg00x *dg00x) { struct fw_device *device = fw_parent_device(dg00x->unit); __be32 data[2]; int err; /* Unknown. 4bytes. */ data[0] = cpu_to_be32((device->card->node_id << 16) | (dg00x->async_handler.offset >> 32)); data[1] = cpu_to_be32(dg00x->async_handler.offset); err = snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST, DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR, &data, sizeof(data), 0); if (err < 0) return err; /* Asynchronous transactions for MIDI control message. */ data[0] = cpu_to_be32((device->card->node_id << 16) | (dg00x->async_handler.offset >> 32)); data[1] = cpu_to_be32(dg00x->async_handler.offset + 4); return snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST, DG00X_ADDR_BASE + DG00X_OFFSET_MIDI_CTL_ADDR, &data, sizeof(data), 0); }

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takashi sakamototakashi sakamoto177100.00%2100.00%
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int snd_dg00x_transaction_register(struct snd_dg00x *dg00x) { static const struct fw_address_region resp_register_region = { .start = 0xffffe0000000ull, .end = 0xffffe000ffffull, }; int err; dg00x->async_handler.length = 12; dg00x->async_handler.address_callback = handle_message; dg00x->async_handler.callback_data = dg00x; err = fw_core_add_address_handler(&dg00x->async_handler, &resp_register_region); if (err < 0) return err; err = snd_dg00x_transaction_reregister(dg00x); if (err < 0) goto error; err = snd_fw_async_midi_port_init(&dg00x->out_control, dg00x->unit, DG00X_ADDR_BASE + DG00X_OFFSET_MMC, 4, fill_midi_message); if (err < 0) goto error; return err; error: fw_core_remove_address_handler(&dg00x->async_handler); dg00x->async_handler.callback_data = NULL; return err; }

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takashi sakamototakashi sakamoto148100.00%4100.00%
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void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x) { if (dg00x->async_handler.callback_data == NULL) return; snd_fw_async_midi_port_destroy(&dg00x->out_control); fw_core_remove_address_handler(&dg00x->async_handler); dg00x->async_handler.callback_data = NULL; }

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