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kernel_optimize_test/sound/firewire/motu/motu-stream.c
Markus Elfring f16e666b9b ALSA: firewire: Use common error handling code in snd_motu_stream_start_duplex() 
Add a jump target so that a bit of exception handling can be better reused
at the end of this function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-09-12 09:23:26 +02:00

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C
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/*
* motu-stream.c - a part of driver for MOTU FireWire series
*
* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include "motu.h"
#define CALLBACK_TIMEOUT 200
#define ISOC_COMM_CONTROL_OFFSET 0x0b00
#define ISOC_COMM_CONTROL_MASK 0xffff0000
#define CHANGE_RX_ISOC_COMM_STATE 0x80000000
#define RX_ISOC_COMM_IS_ACTIVATED 0x40000000
#define RX_ISOC_COMM_CHANNEL_MASK 0x3f000000
#define RX_ISOC_COMM_CHANNEL_SHIFT 24
#define CHANGE_TX_ISOC_COMM_STATE 0x00800000
#define TX_ISOC_COMM_IS_ACTIVATED 0x00400000
#define TX_ISOC_COMM_CHANNEL_MASK 0x003f0000
#define TX_ISOC_COMM_CHANNEL_SHIFT 16
#define PACKET_FORMAT_OFFSET 0x0b10
#define TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS 0x00000080
#define RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS 0x00000040
#define TX_PACKET_TRANSMISSION_SPEED_MASK 0x0000000f
static int start_both_streams(struct snd_motu *motu, unsigned int rate)
{
unsigned int midi_ports = 0;
__be32 reg;
u32 data;
int err;
if ((motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_2ND_Q) ||
(motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_3RD_Q))
midi_ports = 1;
/* Set packet formation to our packet streaming engine. */
err = amdtp_motu_set_parameters(&motu->rx_stream, rate, midi_ports,
&motu->rx_packet_formats);
if (err < 0)
return err;
if ((motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_2ND_Q) ||
(motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_3RD_Q))
midi_ports = 1;
else
midi_ports = 0;
err = amdtp_motu_set_parameters(&motu->tx_stream, rate, midi_ports,
&motu->tx_packet_formats);
if (err < 0)
return err;
/* Get isochronous resources on the bus. */
err = fw_iso_resources_allocate(&motu->rx_resources,
amdtp_stream_get_max_payload(&motu->rx_stream),
fw_parent_device(motu->unit)->max_speed);
if (err < 0)
return err;
err = fw_iso_resources_allocate(&motu->tx_resources,
amdtp_stream_get_max_payload(&motu->tx_stream),
fw_parent_device(motu->unit)->max_speed);
if (err < 0)
return err;
/* Configure the unit to start isochronous communication. */
err = snd_motu_transaction_read(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
sizeof(reg));
if (err < 0)
return err;
data = be32_to_cpu(reg) & ~ISOC_COMM_CONTROL_MASK;
data |= CHANGE_RX_ISOC_COMM_STATE | RX_ISOC_COMM_IS_ACTIVATED |
(motu->rx_resources.channel << RX_ISOC_COMM_CHANNEL_SHIFT) |
CHANGE_TX_ISOC_COMM_STATE | TX_ISOC_COMM_IS_ACTIVATED |
(motu->tx_resources.channel << TX_ISOC_COMM_CHANNEL_SHIFT);
reg = cpu_to_be32(data);
return snd_motu_transaction_write(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
sizeof(reg));
}
static void stop_both_streams(struct snd_motu *motu)
{
__be32 reg;
u32 data;
int err;
err = motu->spec->protocol->switch_fetching_mode(motu, false);
if (err < 0)
return;
err = snd_motu_transaction_read(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
sizeof(reg));
if (err < 0)
return;
data = be32_to_cpu(reg);
data &= ~(RX_ISOC_COMM_IS_ACTIVATED | TX_ISOC_COMM_IS_ACTIVATED);
data |= CHANGE_RX_ISOC_COMM_STATE | CHANGE_TX_ISOC_COMM_STATE;
reg = cpu_to_be32(data);
snd_motu_transaction_write(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
sizeof(reg));
fw_iso_resources_free(&motu->tx_resources);
fw_iso_resources_free(&motu->rx_resources);
}
static int start_isoc_ctx(struct snd_motu *motu, struct amdtp_stream *stream)
{
struct fw_iso_resources *resources;
int err;
if (stream == &motu->rx_stream)
resources = &motu->rx_resources;
else
resources = &motu->tx_resources;
err = amdtp_stream_start(stream, resources->channel,
fw_parent_device(motu->unit)->max_speed);
if (err < 0)
return err;
if (!amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT)) {
amdtp_stream_stop(stream);
fw_iso_resources_free(resources);
return -ETIMEDOUT;
}
return 0;
}
static void stop_isoc_ctx(struct snd_motu *motu, struct amdtp_stream *stream)
{
struct fw_iso_resources *resources;
if (stream == &motu->rx_stream)
resources = &motu->rx_resources;
else
resources = &motu->tx_resources;
amdtp_stream_stop(stream);
fw_iso_resources_free(resources);
}
int snd_motu_stream_cache_packet_formats(struct snd_motu *motu)
{
int err;
err = motu->spec->protocol->cache_packet_formats(motu);
if (err < 0)
return err;
if (motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_2ND_Q) {
motu->tx_packet_formats.midi_flag_offset = 4;
motu->tx_packet_formats.midi_byte_offset = 6;
} else if (motu->spec->flags & SND_MOTU_SPEC_TX_MIDI_3RD_Q) {
motu->tx_packet_formats.midi_flag_offset = 8;
motu->tx_packet_formats.midi_byte_offset = 7;
}
if (motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_2ND_Q) {
motu->rx_packet_formats.midi_flag_offset = 4;
motu->rx_packet_formats.midi_byte_offset = 6;
} else if (motu->spec->flags & SND_MOTU_SPEC_RX_MIDI_3RD_Q) {
motu->rx_packet_formats.midi_flag_offset = 8;
motu->rx_packet_formats.midi_byte_offset = 7;
}
return 0;
}
static int ensure_packet_formats(struct snd_motu *motu)
{
__be32 reg;
u32 data;
int err;
err = snd_motu_transaction_read(motu, PACKET_FORMAT_OFFSET, &reg,
sizeof(reg));
if (err < 0)
return err;
data = be32_to_cpu(reg);
data &= ~(TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS |
RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS|
TX_PACKET_TRANSMISSION_SPEED_MASK);
if (motu->tx_packet_formats.differed_part_pcm_chunks[0] == 0)
data |= TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS;
if (motu->rx_packet_formats.differed_part_pcm_chunks[0] == 0)
data |= RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS;
data |= fw_parent_device(motu->unit)->max_speed;
reg = cpu_to_be32(data);
return snd_motu_transaction_write(motu, PACKET_FORMAT_OFFSET, &reg,
sizeof(reg));
}
int snd_motu_stream_start_duplex(struct snd_motu *motu, unsigned int rate)
{
const struct snd_motu_protocol *protocol = motu->spec->protocol;
unsigned int curr_rate;
int err = 0;
if (motu->capture_substreams == 0 && motu->playback_substreams == 0)
return 0;
/* Some packet queueing errors. */
if (amdtp_streaming_error(&motu->rx_stream) ||
amdtp_streaming_error(&motu->tx_stream)) {
amdtp_stream_stop(&motu->rx_stream);
amdtp_stream_stop(&motu->tx_stream);
stop_both_streams(motu);
}
err = snd_motu_stream_cache_packet_formats(motu);
if (err < 0)
return err;
/* Stop stream if rate is different. */
err = protocol->get_clock_rate(motu, &curr_rate);
if (err < 0) {
dev_err(&motu->unit->device,
"fail to get sampling rate: %d\n", err);
return err;
}
if (rate == 0)
rate = curr_rate;
if (rate != curr_rate) {
amdtp_stream_stop(&motu->rx_stream);
amdtp_stream_stop(&motu->tx_stream);
stop_both_streams(motu);
}
if (!amdtp_stream_running(&motu->rx_stream)) {
err = protocol->set_clock_rate(motu, rate);
if (err < 0) {
dev_err(&motu->unit->device,
"fail to set sampling rate: %d\n", err);
return err;
}
err = ensure_packet_formats(motu);
if (err < 0)
return err;
err = start_both_streams(motu, rate);
if (err < 0) {
dev_err(&motu->unit->device,
"fail to start isochronous comm: %d\n", err);
goto stop_streams;
}
err = start_isoc_ctx(motu, &motu->rx_stream);
if (err < 0) {
dev_err(&motu->unit->device,
"fail to start IT context: %d\n", err);
goto stop_streams;
}
err = protocol->switch_fetching_mode(motu, true);
if (err < 0) {
dev_err(&motu->unit->device,
"fail to enable frame fetching: %d\n", err);
goto stop_streams;
}
}
if (!amdtp_stream_running(&motu->tx_stream) &&
motu->capture_substreams > 0) {
err = start_isoc_ctx(motu, &motu->tx_stream);
if (err < 0) {
dev_err(&motu->unit->device,
"fail to start IR context: %d", err);
amdtp_stream_stop(&motu->rx_stream);
goto stop_streams;
}
}
return 0;
stop_streams:
stop_both_streams(motu);
return err;
}
void snd_motu_stream_stop_duplex(struct snd_motu *motu)
{
if (motu->capture_substreams == 0) {
if (amdtp_stream_running(&motu->tx_stream))
stop_isoc_ctx(motu, &motu->tx_stream);
if (motu->playback_substreams == 0) {
if (amdtp_stream_running(&motu->rx_stream))
stop_isoc_ctx(motu, &motu->rx_stream);
stop_both_streams(motu);
}
}
}
static int init_stream(struct snd_motu *motu, enum amdtp_stream_direction dir)
{
int err;
struct amdtp_stream *stream;
struct fw_iso_resources *resources;
if (dir == AMDTP_IN_STREAM) {
stream = &motu->tx_stream;
resources = &motu->tx_resources;
} else {
stream = &motu->rx_stream;
resources = &motu->rx_resources;
}
err = fw_iso_resources_init(resources, motu->unit);
if (err < 0)
return err;
err = amdtp_motu_init(stream, motu->unit, dir, motu->spec->protocol);
if (err < 0) {
amdtp_stream_destroy(stream);
fw_iso_resources_destroy(resources);
}
return err;
}
static void destroy_stream(struct snd_motu *motu,
enum amdtp_stream_direction dir)
{
struct amdtp_stream *stream;
struct fw_iso_resources *resources;
if (dir == AMDTP_IN_STREAM) {
stream = &motu->tx_stream;
resources = &motu->tx_resources;
} else {
stream = &motu->rx_stream;
resources = &motu->rx_resources;
}
amdtp_stream_destroy(stream);
fw_iso_resources_free(resources);
}
int snd_motu_stream_init_duplex(struct snd_motu *motu)
{
int err;
err = init_stream(motu, AMDTP_IN_STREAM);
if (err < 0)
return err;
err = init_stream(motu, AMDTP_OUT_STREAM);
if (err < 0)
destroy_stream(motu, AMDTP_IN_STREAM);
return err;
}
/*
* This function should be called before starting streams or after stopping
* streams.
*/
void snd_motu_stream_destroy_duplex(struct snd_motu *motu)
{
destroy_stream(motu, AMDTP_IN_STREAM);
destroy_stream(motu, AMDTP_OUT_STREAM);
motu->playback_substreams = 0;
motu->capture_substreams = 0;
}
static void motu_lock_changed(struct snd_motu *motu)
{
motu->dev_lock_changed = true;
wake_up(&motu->hwdep_wait);
}
int snd_motu_stream_lock_try(struct snd_motu *motu)
{
int err;
spin_lock_irq(&motu->lock);
if (motu->dev_lock_count < 0) {
err = -EBUSY;
goto out;
}
if (motu->dev_lock_count++ == 0)
motu_lock_changed(motu);
err = 0;
out:
spin_unlock_irq(&motu->lock);
return err;
}
void snd_motu_stream_lock_release(struct snd_motu *motu)
{
spin_lock_irq(&motu->lock);
if (WARN_ON(motu->dev_lock_count <= 0))
goto out;
if (--motu->dev_lock_count == 0)
motu_lock_changed(motu);
out:
spin_unlock_irq(&motu->lock);
}
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