Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Browse files

ALSA: add LaCie FireWire Speakers/Griffin FireWave Surround driver

Add a driver for two playback-only FireWire devices based on the OXFW970
chip.

v2: better AMDTP API abstraction; fix fw_unit leak; small fixes
v3: cache the iPCR value
v4: FireWave constraints; fix fw_device reference counting;
    fix PCR caching; small changes and fixes
v5: volume/mute support; fix crashing due to pcm stop races
v6: fix build; one-channel volume for LaCie
v7: use signed values to make volume (range checks) work; fix function
    block IDs for volume/mute; always use channel 0 for LaCie volume

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Tested-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
  • Loading branch information...
commit 31ef9134eb52636d383a7d0626cbbd345cb94f2f 1 parent a5abba9
@cladisch cladisch authored tiwai committed
View
1  drivers/firewire/core-iso.c
@@ -362,3 +362,4 @@ void fw_iso_resource_manage(struct fw_card *card, int generation,
*channel = ret;
}
}
+EXPORT_SYMBOL(fw_iso_resource_manage);
View
3  drivers/firewire/core.h
@@ -147,9 +147,6 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
/* -iso */
int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma);
-void fw_iso_resource_manage(struct fw_card *card, int generation,
- u64 channels_mask, int *channel, int *bandwidth,
- bool allocate, __be32 buffer[2]);
/* -topology */
View
7 include/linux/firewire.h
@@ -42,6 +42,10 @@
#define CSR_BROADCAST_CHANNEL 0x234
#define CSR_CONFIG_ROM 0x400
#define CSR_CONFIG_ROM_END 0x800
+#define CSR_OMPR 0x900
+#define CSR_OPCR(i) (0x904 + (i) * 4)
+#define CSR_IMPR 0x980
+#define CSR_IPCR(i) (0x984 + (i) * 4)
#define CSR_FCP_COMMAND 0xB00
#define CSR_FCP_RESPONSE 0xD00
#define CSR_FCP_END 0xF00
@@ -441,5 +445,8 @@ int fw_iso_context_start(struct fw_iso_context *ctx,
int cycle, int sync, int tags);
int fw_iso_context_stop(struct fw_iso_context *ctx);
void fw_iso_context_destroy(struct fw_iso_context *ctx);
+void fw_iso_resource_manage(struct fw_card *card, int generation,
+ u64 channels_mask, int *channel, int *bandwidth,
+ bool allocate, __be32 buffer[2]);
#endif /* _LINUX_FIREWIRE_H */
View
2  sound/Kconfig
@@ -97,6 +97,8 @@ source "sound/sh/Kconfig"
# here assuming USB is defined before ALSA
source "sound/usb/Kconfig"
+source "sound/firewire/Kconfig"
+
# the following will depend on the order of config.
# here assuming PCMCIA is defined before ALSA
source "sound/pcmcia/Kconfig"
View
2  sound/Makefile
@@ -6,7 +6,7 @@ obj-$(CONFIG_SOUND_PRIME) += sound_firmware.o
obj-$(CONFIG_SOUND_PRIME) += oss/
obj-$(CONFIG_DMASOUND) += oss/
obj-$(CONFIG_SND) += core/ i2c/ drivers/ isa/ pci/ ppc/ arm/ sh/ synth/ usb/ \
- sparc/ spi/ parisc/ pcmcia/ mips/ soc/ atmel/
+ firewire/ sparc/ spi/ parisc/ pcmcia/ mips/ soc/ atmel/
obj-$(CONFIG_SND_AOA) += aoa/
# This one must be compilable even if sound is configured out
View
25 sound/firewire/Kconfig
@@ -0,0 +1,25 @@
+menuconfig SND_FIREWIRE
+ bool "FireWire sound devices"
+ depends on FIREWIRE
+ default y
+ help
+ Support for IEEE-1394/FireWire/iLink sound devices.
+
+if SND_FIREWIRE && FIREWIRE
+
+config SND_FIREWIRE_LIB
+ tristate
+ depends on SND_PCM
+
+config SND_FIREWIRE_SPEAKERS
+ tristate "FireWire speakers"
+ select SND_PCM
+ select SND_FIREWIRE_LIB
+ help
+ Say Y here to include support for the Griffin FireWave Surround
+ and the LaCie FireWire Speakers.
+
+ To compile this driver as a module, choose M here: the module
+ will be called snd-firewire-speakers.
+
+endif # SND_FIREWIRE
View
6 sound/firewire/Makefile
@@ -0,0 +1,6 @@
+snd-firewire-lib-objs := lib.o iso-resources.o packets-buffer.o \
+ fcp.o cmp.o amdtp.o
+snd-firewire-speakers-objs := speakers.o
+
+obj-$(CONFIG_SND_FIREWIRE_LIB) += snd-firewire-lib.o
+obj-$(CONFIG_SND_FIREWIRE_SPEAKERS) += snd-firewire-speakers.o
View
549 sound/firewire/amdtp.c
@@ -0,0 +1,549 @@
+/*
+ * Audio and Music Data Transmission Protocol (IEC 61883-6) streams
+ * with Common Isochronous Packet (IEC 61883-1) headers
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/firewire.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <sound/pcm.h>
+#include "amdtp.h"
+
+#define TICKS_PER_CYCLE 3072
+#define CYCLES_PER_SECOND 8000
+#define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND)
+
+#define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */
+
+#define TAG_CIP 1
+
+#define CIP_EOH (1u << 31)
+#define CIP_FMT_AM (0x10 << 24)
+#define AMDTP_FDF_AM824 (0 << 19)
+#define AMDTP_FDF_SFC_SHIFT 16
+
+/* TODO: make these configurable */
+#define INTERRUPT_INTERVAL 16
+#define QUEUE_LENGTH 48
+
+/**
+ * amdtp_out_stream_init - initialize an AMDTP output stream structure
+ * @s: the AMDTP output stream to initialize
+ * @unit: the target of the stream
+ * @flags: the packet transmission method to use
+ */
+int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit,
+ enum cip_out_flags flags)
+{
+ if (flags != CIP_NONBLOCKING)
+ return -EINVAL;
+
+ s->unit = fw_unit_get(unit);
+ s->flags = flags;
+ s->context = ERR_PTR(-1);
+ mutex_init(&s->mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL(amdtp_out_stream_init);
+
+/**
+ * amdtp_out_stream_destroy - free stream resources
+ * @s: the AMDTP output stream to destroy
+ */
+void amdtp_out_stream_destroy(struct amdtp_out_stream *s)
+{
+ WARN_ON(!IS_ERR(s->context));
+ mutex_destroy(&s->mutex);
+ fw_unit_put(s->unit);
+}
+EXPORT_SYMBOL(amdtp_out_stream_destroy);
+
+/**
+ * amdtp_out_stream_set_rate - set the sample rate
+ * @s: the AMDTP output stream to configure
+ * @rate: the sample rate
+ *
+ * The sample rate must be set before the stream is started, and must not be
+ * changed while the stream is running.
+ */
+void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate)
+{
+ static const struct {
+ unsigned int rate;
+ unsigned int syt_interval;
+ } rate_info[] = {
+ [CIP_SFC_32000] = { 32000, 8, },
+ [CIP_SFC_44100] = { 44100, 8, },
+ [CIP_SFC_48000] = { 48000, 8, },
+ [CIP_SFC_88200] = { 88200, 16, },
+ [CIP_SFC_96000] = { 96000, 16, },
+ [CIP_SFC_176400] = { 176400, 32, },
+ [CIP_SFC_192000] = { 192000, 32, },
+ };
+ unsigned int sfc;
+
+ if (WARN_ON(!IS_ERR(s->context)))
+ return;
+
+ for (sfc = 0; sfc < ARRAY_SIZE(rate_info); ++sfc)
+ if (rate_info[sfc].rate == rate) {
+ s->sfc = sfc;
+ s->syt_interval = rate_info[sfc].syt_interval;
+ return;
+ }
+ WARN_ON(1);
+}
+EXPORT_SYMBOL(amdtp_out_stream_set_rate);
+
+/**
+ * amdtp_out_stream_get_max_payload - get the stream's packet size
+ * @s: the AMDTP output stream
+ *
+ * This function must not be called before the stream has been configured
+ * with amdtp_out_stream_set_hw_params(), amdtp_out_stream_set_pcm(), and
+ * amdtp_out_stream_set_midi().
+ */
+unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s)
+{
+ static const unsigned int max_data_blocks[] = {
+ [CIP_SFC_32000] = 4,
+ [CIP_SFC_44100] = 6,
+ [CIP_SFC_48000] = 6,
+ [CIP_SFC_88200] = 12,
+ [CIP_SFC_96000] = 12,
+ [CIP_SFC_176400] = 23,
+ [CIP_SFC_192000] = 24,
+ };
+
+ s->data_block_quadlets = s->pcm_channels;
+ s->data_block_quadlets += DIV_ROUND_UP(s->midi_ports, 8);
+
+ return 8 + max_data_blocks[s->sfc] * 4 * s->data_block_quadlets;
+}
+EXPORT_SYMBOL(amdtp_out_stream_get_max_payload);
+
+static void amdtp_write_s16(struct amdtp_out_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames);
+static void amdtp_write_s32(struct amdtp_out_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames);
+
+/**
+ * amdtp_out_stream_set_pcm_format - set the PCM format
+ * @s: the AMDTP output stream to configure
+ * @format: the format of the ALSA PCM device
+ *
+ * The sample format must be set before the stream is started, and must not be
+ * changed while the stream is running.
+ */
+void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
+ snd_pcm_format_t format)
+{
+ if (WARN_ON(!IS_ERR(s->context)))
+ return;
+
+ switch (format) {
+ default:
+ WARN_ON(1);
+ /* fall through */
+ case SNDRV_PCM_FORMAT_S16:
+ s->transfer_samples = amdtp_write_s16;
+ break;
+ case SNDRV_PCM_FORMAT_S32:
+ s->transfer_samples = amdtp_write_s32;
+ break;
+ }
+}
+EXPORT_SYMBOL(amdtp_out_stream_set_pcm_format);
+
+static unsigned int calculate_data_blocks(struct amdtp_out_stream *s)
+{
+ unsigned int phase, data_blocks;
+
+ if (!cip_sfc_is_base_44100(s->sfc)) {
+ /* Sample_rate / 8000 is an integer, and precomputed. */
+ data_blocks = s->data_block_state;
+ } else {
+ phase = s->data_block_state;
+
+ /*
+ * This calculates the number of data blocks per packet so that
+ * 1) the overall rate is correct and exactly synchronized to
+ * the bus clock, and
+ * 2) packets with a rounded-up number of blocks occur as early
+ * as possible in the sequence (to prevent underruns of the
+ * device's buffer).
+ */
+ if (s->sfc == CIP_SFC_44100)
+ /* 6 6 5 6 5 6 5 ... */
+ data_blocks = 5 + ((phase & 1) ^
+ (phase == 0 || phase >= 40));
+ else
+ /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */
+ data_blocks = 11 * (s->sfc >> 1) + (phase == 0);
+ if (++phase >= (80 >> (s->sfc >> 1)))
+ phase = 0;
+ s->data_block_state = phase;
+ }
+
+ return data_blocks;
+}
+
+static unsigned int calculate_syt(struct amdtp_out_stream *s,
+ unsigned int cycle)
+{
+ unsigned int syt_offset, phase, index, syt;
+
+ if (s->last_syt_offset < TICKS_PER_CYCLE) {
+ if (!cip_sfc_is_base_44100(s->sfc))
+ syt_offset = s->last_syt_offset + s->syt_offset_state;
+ else {
+ /*
+ * The time, in ticks, of the n'th SYT_INTERVAL sample is:
+ * n * SYT_INTERVAL * 24576000 / sample_rate
+ * Modulo TICKS_PER_CYCLE, the difference between successive
+ * elements is about 1386.23. Rounding the results of this
+ * formula to the SYT precision results in a sequence of
+ * differences that begins with:
+ * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ...
+ * This code generates _exactly_ the same sequence.
+ */
+ phase = s->syt_offset_state;
+ index = phase % 13;
+ syt_offset = s->last_syt_offset;
+ syt_offset += 1386 + ((index && !(index & 3)) ||
+ phase == 146);
+ if (++phase >= 147)
+ phase = 0;
+ s->syt_offset_state = phase;
+ }
+ } else
+ syt_offset = s->last_syt_offset - TICKS_PER_CYCLE;
+ s->last_syt_offset = syt_offset;
+
+ syt_offset += TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE;
+ syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12;
+ syt += syt_offset % TICKS_PER_CYCLE;
+
+ return syt & 0xffff;
+}
+
+static void amdtp_write_s32(struct amdtp_out_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames)
+{
+ struct snd_pcm_runtime *runtime = pcm->runtime;
+ unsigned int channels, remaining_frames, frame_step, i, c;
+ const u32 *src;
+
+ channels = s->pcm_channels;
+ src = (void *)runtime->dma_area +
+ s->pcm_buffer_pointer * (runtime->frame_bits / 8);
+ remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
+ frame_step = s->data_block_quadlets - channels;
+
+ for (i = 0; i < frames; ++i) {
+ for (c = 0; c < channels; ++c) {
+ *buffer = cpu_to_be32((*src >> 8) | 0x40000000);
+ src++;
+ buffer++;
+ }
+ buffer += frame_step;
+ if (--remaining_frames == 0)
+ src = (void *)runtime->dma_area;
+ }
+}
+
+static void amdtp_write_s16(struct amdtp_out_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames)
+{
+ struct snd_pcm_runtime *runtime = pcm->runtime;
+ unsigned int channels, remaining_frames, frame_step, i, c;
+ const u16 *src;
+
+ channels = s->pcm_channels;
+ src = (void *)runtime->dma_area +
+ s->pcm_buffer_pointer * (runtime->frame_bits / 8);
+ remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
+ frame_step = s->data_block_quadlets - channels;
+
+ for (i = 0; i < frames; ++i) {
+ for (c = 0; c < channels; ++c) {
+ *buffer = cpu_to_be32((*src << 8) | 0x40000000);
+ src++;
+ buffer++;
+ }
+ buffer += frame_step;
+ if (--remaining_frames == 0)
+ src = (void *)runtime->dma_area;
+ }
+}
+
+static void amdtp_fill_pcm_silence(struct amdtp_out_stream *s,
+ __be32 *buffer, unsigned int frames)
+{
+ unsigned int i, c;
+
+ for (i = 0; i < frames; ++i) {
+ for (c = 0; c < s->pcm_channels; ++c)
+ buffer[c] = cpu_to_be32(0x40000000);
+ buffer += s->data_block_quadlets;
+ }
+}
+
+static void amdtp_fill_midi(struct amdtp_out_stream *s,
+ __be32 *buffer, unsigned int frames)
+{
+ unsigned int i;
+
+ for (i = 0; i < frames; ++i)
+ buffer[s->pcm_channels + i * s->data_block_quadlets] =
+ cpu_to_be32(0x80000000);
+}
+
+static void queue_out_packet(struct amdtp_out_stream *s, unsigned int cycle)
+{
+ __be32 *buffer;
+ unsigned int data_blocks, syt, ptr;
+ struct snd_pcm_substream *pcm;
+ struct fw_iso_packet packet;
+ int err;
+
+ data_blocks = calculate_data_blocks(s);
+ syt = calculate_syt(s, cycle);
+
+ buffer = s->buffer.packets[s->packet_counter].buffer;
+ buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) |
+ (s->data_block_quadlets << 16) |
+ s->data_block_counter);
+ buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 |
+ (s->sfc << AMDTP_FDF_SFC_SHIFT) | syt);
+ buffer += 2;
+
+ pcm = ACCESS_ONCE(s->pcm);
+ if (pcm)
+ s->transfer_samples(s, pcm, buffer, data_blocks);
+ else
+ amdtp_fill_pcm_silence(s, buffer, data_blocks);
+ if (s->midi_ports)
+ amdtp_fill_midi(s, buffer, data_blocks);
+
+ s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff;
+
+ packet.payload_length = 8 + data_blocks * 4 * s->data_block_quadlets;
+ packet.interrupt = IS_ALIGNED(s->packet_counter + 1,
+ INTERRUPT_INTERVAL);
+ packet.skip = 0;
+ packet.tag = TAG_CIP;
+ packet.sy = 0;
+ packet.header_length = 0;
+
+ err = fw_iso_context_queue(s->context, &packet, &s->buffer.iso_buffer,
+ s->buffer.packets[s->packet_counter].offset);
+ if (err < 0)
+ dev_err(&s->unit->device, "queueing error: %d\n", err);
+
+ if (++s->packet_counter >= QUEUE_LENGTH)
+ s->packet_counter = 0;
+
+ if (pcm) {
+ ptr = s->pcm_buffer_pointer + data_blocks;
+ if (ptr >= pcm->runtime->buffer_size)
+ ptr -= pcm->runtime->buffer_size;
+ ACCESS_ONCE(s->pcm_buffer_pointer) = ptr;
+
+ s->pcm_period_pointer += data_blocks;
+ if (s->pcm_period_pointer >= pcm->runtime->period_size) {
+ s->pcm_period_pointer -= pcm->runtime->period_size;
+ snd_pcm_period_elapsed(pcm);
+ }
+ }
+}
+
+static void out_packet_callback(struct fw_iso_context *context, u32 cycle,
+ size_t header_length, void *header, void *data)
+{
+ struct amdtp_out_stream *s = data;
+ unsigned int i, packets = header_length / 4;
+
+ /*
+ * Compute the cycle of the last queued packet.
+ * (We need only the four lowest bits for the SYT, so we can ignore
+ * that bits 0-11 must wrap around at 3072.)
+ */
+ cycle += QUEUE_LENGTH - packets;
+
+ for (i = 0; i < packets; ++i)
+ queue_out_packet(s, ++cycle);
+}
+
+static int queue_initial_skip_packets(struct amdtp_out_stream *s)
+{
+ struct fw_iso_packet skip_packet = {
+ .skip = 1,
+ };
+ unsigned int i;
+ int err;
+
+ for (i = 0; i < QUEUE_LENGTH; ++i) {
+ skip_packet.interrupt = IS_ALIGNED(s->packet_counter + 1,
+ INTERRUPT_INTERVAL);
+ err = fw_iso_context_queue(s->context, &skip_packet, NULL, 0);
+ if (err < 0)
+ return err;
+ if (++s->packet_counter >= QUEUE_LENGTH)
+ s->packet_counter = 0;
+ }
+
+ return 0;
+}
+
+/**
+ * amdtp_out_stream_start - start sending packets
+ * @s: the AMDTP output stream to start
+ * @channel: the isochronous channel on the bus
+ * @speed: firewire speed code
+ *
+ * The stream cannot be started until it has been configured with
+ * amdtp_out_stream_set_hw_params(), amdtp_out_stream_set_pcm(), and
+ * amdtp_out_stream_set_midi(); and it must be started before any
+ * PCM or MIDI device can be started.
+ */
+int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed)
+{
+ static const struct {
+ unsigned int data_block;
+ unsigned int syt_offset;
+ } initial_state[] = {
+ [CIP_SFC_32000] = { 4, 3072 },
+ [CIP_SFC_48000] = { 6, 1024 },
+ [CIP_SFC_96000] = { 12, 1024 },
+ [CIP_SFC_192000] = { 24, 1024 },
+ [CIP_SFC_44100] = { 0, 67 },
+ [CIP_SFC_88200] = { 0, 67 },
+ [CIP_SFC_176400] = { 0, 67 },
+ };
+ int err;
+
+ mutex_lock(&s->mutex);
+
+ if (WARN_ON(!IS_ERR(s->context) ||
+ (!s->pcm_channels && !s->midi_ports))) {
+ err = -EBADFD;
+ goto err_unlock;
+ }
+
+ s->data_block_state = initial_state[s->sfc].data_block;
+ s->syt_offset_state = initial_state[s->sfc].syt_offset;
+ s->last_syt_offset = TICKS_PER_CYCLE;
+
+ err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH,
+ amdtp_out_stream_get_max_payload(s),
+ DMA_TO_DEVICE);
+ if (err < 0)
+ goto err_unlock;
+
+ s->context = fw_iso_context_create(fw_parent_device(s->unit)->card,
+ FW_ISO_CONTEXT_TRANSMIT,
+ channel, speed, 0,
+ out_packet_callback, s);
+ if (IS_ERR(s->context)) {
+ err = PTR_ERR(s->context);
+ if (err == -EBUSY)
+ dev_err(&s->unit->device,
+ "no free output stream on this controller\n");
+ goto err_buffer;
+ }
+
+ amdtp_out_stream_update(s);
+
+ s->packet_counter = 0;
+ s->data_block_counter = 0;
+ err = queue_initial_skip_packets(s);
+ if (err < 0)
+ goto err_context;
+
+ err = fw_iso_context_start(s->context, -1, 0, 0);
+ if (err < 0)
+ goto err_context;
+
+ mutex_unlock(&s->mutex);
+
+ return 0;
+
+err_context:
+ fw_iso_context_destroy(s->context);
+ s->context = ERR_PTR(-1);
+err_buffer:
+ iso_packets_buffer_destroy(&s->buffer, s->unit);
+err_unlock:
+ mutex_unlock(&s->mutex);
+
+ return err;
+}
+EXPORT_SYMBOL(amdtp_out_stream_start);
+
+/**
+ * amdtp_out_stream_update - update the stream after a bus reset
+ * @s: the AMDTP output stream
+ */
+void amdtp_out_stream_update(struct amdtp_out_stream *s)
+{
+ ACCESS_ONCE(s->source_node_id_field) =
+ (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24;
+}
+EXPORT_SYMBOL(amdtp_out_stream_update);
+
+/**
+ * amdtp_out_stream_stop - stop sending packets
+ * @s: the AMDTP output stream to stop
+ *
+ * All PCM and MIDI devices of the stream must be stopped before the stream
+ * itself can be stopped.
+ */
+void amdtp_out_stream_stop(struct amdtp_out_stream *s)
+{
+ mutex_lock(&s->mutex);
+
+ if (IS_ERR(s->context)) {
+ mutex_unlock(&s->mutex);
+ return;
+ }
+
+ fw_iso_context_stop(s->context);
+ fw_iso_context_destroy(s->context);
+ s->context = ERR_PTR(-1);
+ iso_packets_buffer_destroy(&s->buffer, s->unit);
+
+ mutex_unlock(&s->mutex);
+}
+EXPORT_SYMBOL(amdtp_out_stream_stop);
+
+/**
+ * amdtp_out_stream_pcm_abort - abort the running PCM device
+ * @s: the AMDTP stream about to be stopped
+ *
+ * If the isochronous stream needs to be stopped asynchronously, call this
+ * function first to stop the PCM device.
+ */
+void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s)
+{
+ struct snd_pcm_substream *pcm;
+
+ pcm = ACCESS_ONCE(s->pcm);
+ if (pcm) {
+ snd_pcm_stream_lock_irq(pcm);
+ if (snd_pcm_running(pcm))
+ snd_pcm_stop(pcm, SNDRV_PCM_STATE_XRUN);
+ snd_pcm_stream_unlock_irq(pcm);
+ }
+}
+EXPORT_SYMBOL(amdtp_out_stream_pcm_abort);
View
157 sound/firewire/amdtp.h
@@ -0,0 +1,157 @@
+#ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED
+#define SOUND_FIREWIRE_AMDTP_H_INCLUDED
+
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include "packets-buffer.h"
+
+/**
+ * enum cip_out_flags - describes details of the streaming protocol
+ * @CIP_NONBLOCKING: In non-blocking mode, each packet contains
+ * sample_rate/8000 samples, with rounding up or down to adjust
+ * for clock skew and left-over fractional samples. This should
+ * be used if supported by the device.
+ */
+enum cip_out_flags {
+ CIP_NONBLOCKING = 0,
+};
+
+/**
+ * enum cip_sfc - a stream's sample rate
+ */
+enum cip_sfc {
+ CIP_SFC_32000 = 0,
+ CIP_SFC_44100 = 1,
+ CIP_SFC_48000 = 2,
+ CIP_SFC_88200 = 3,
+ CIP_SFC_96000 = 4,
+ CIP_SFC_176400 = 5,
+ CIP_SFC_192000 = 6,
+};
+
+#define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \
+ SNDRV_PCM_FMTBIT_S32)
+
+struct fw_unit;
+struct fw_iso_context;
+struct snd_pcm_substream;
+
+struct amdtp_out_stream {
+ struct fw_unit *unit;
+ enum cip_out_flags flags;
+ struct fw_iso_context *context;
+ struct mutex mutex;
+
+ enum cip_sfc sfc;
+ unsigned int data_block_quadlets;
+ unsigned int pcm_channels;
+ unsigned int midi_ports;
+ void (*transfer_samples)(struct amdtp_out_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames);
+
+ unsigned int syt_interval;
+ unsigned int source_node_id_field;
+ struct iso_packets_buffer buffer;
+
+ struct snd_pcm_substream *pcm;
+
+ unsigned int packet_counter;
+ unsigned int data_block_counter;
+
+ unsigned int data_block_state;
+
+ unsigned int last_syt_offset;
+ unsigned int syt_offset_state;
+
+ unsigned int pcm_buffer_pointer;
+ unsigned int pcm_period_pointer;
+};
+
+int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit,
+ enum cip_out_flags flags);
+void amdtp_out_stream_destroy(struct amdtp_out_stream *s);
+
+void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate);
+unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s);
+
+int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed);
+void amdtp_out_stream_update(struct amdtp_out_stream *s);
+void amdtp_out_stream_stop(struct amdtp_out_stream *s);
+
+void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
+ snd_pcm_format_t format);
+void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s);
+
+/**
+ * amdtp_out_stream_set_pcm - configure format of PCM samples
+ * @s: the AMDTP output stream to be configured
+ * @pcm_channels: the number of PCM samples in each data block, to be encoded
+ * as AM824 multi-bit linear audio
+ *
+ * This function must not be called while the stream is running.
+ */
+static inline void amdtp_out_stream_set_pcm(struct amdtp_out_stream *s,
+ unsigned int pcm_channels)
+{
+ s->pcm_channels = pcm_channels;
+}
+
+/**
+ * amdtp_out_stream_set_midi - configure format of MIDI data
+ * @s: the AMDTP output stream to be configured
+ * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels)
+ *
+ * This function must not be called while the stream is running.
+ */
+static inline void amdtp_out_stream_set_midi(struct amdtp_out_stream *s,
+ unsigned int midi_ports)
+{
+ s->midi_ports = midi_ports;
+}
+
+/**
+ * amdtp_out_stream_pcm_prepare - prepare PCM device for running
+ * @s: the AMDTP output stream
+ *
+ * This function should be called from the PCM device's .prepare callback.
+ */
+static inline void amdtp_out_stream_pcm_prepare(struct amdtp_out_stream *s)
+{
+ s->pcm_buffer_pointer = 0;
+ s->pcm_period_pointer = 0;
+}
+
+/**
+ * amdtp_out_stream_pcm_trigger - start/stop playback from a PCM device
+ * @s: the AMDTP output stream
+ * @pcm: the PCM device to be started, or %NULL to stop the current device
+ *
+ * Call this function on a running isochronous stream to enable the actual
+ * transmission of PCM data. This function should be called from the PCM
+ * device's .trigger callback.
+ */
+static inline void amdtp_out_stream_pcm_trigger(struct amdtp_out_stream *s,
+ struct snd_pcm_substream *pcm)
+{
+ ACCESS_ONCE(s->pcm) = pcm;
+}
+
+/**
+ * amdtp_out_stream_pcm_pointer - get the PCM buffer position
+ * @s: the AMDTP output stream that transports the PCM data
+ *
+ * Returns the current buffer position, in frames.
+ */
+static inline unsigned long
+amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s)
+{
+ return ACCESS_ONCE(s->pcm_buffer_pointer);
+}
+
+static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
+{
+ return sfc & 1;
+}
+
+#endif
View
305 sound/firewire/cmp.c
@@ -0,0 +1,305 @@
+/*
+ * Connection Management Procedures (IEC 61883-1) helper functions
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include <linux/device.h>
+#include <linux/firewire.h>
+#include <linux/firewire-constants.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include "lib.h"
+#include "iso-resources.h"
+#include "cmp.h"
+
+#define IMPR_SPEED_MASK 0xc0000000
+#define IMPR_SPEED_SHIFT 30
+#define IMPR_XSPEED_MASK 0x00000060
+#define IMPR_XSPEED_SHIFT 5
+#define IMPR_PLUGS_MASK 0x0000001f
+
+#define IPCR_ONLINE 0x80000000
+#define IPCR_BCAST_CONN 0x40000000
+#define IPCR_P2P_CONN_MASK 0x3f000000
+#define IPCR_P2P_CONN_SHIFT 24
+#define IPCR_CHANNEL_MASK 0x003f0000
+#define IPCR_CHANNEL_SHIFT 16
+
+enum bus_reset_handling {
+ ABORT_ON_BUS_RESET,
+ SUCCEED_ON_BUS_RESET,
+};
+
+static __attribute__((format(printf, 2, 3)))
+void cmp_error(struct cmp_connection *c, const char *fmt, ...)
+{
+ va_list va;
+
+ va_start(va, fmt);
+ dev_err(&c->resources.unit->device, "%cPCR%u: %pV",
+ 'i', c->pcr_index, &(struct va_format){ fmt, &va });
+ va_end(va);
+}
+
+static int pcr_modify(struct cmp_connection *c,
+ __be32 (*modify)(struct cmp_connection *c, __be32 old),
+ int (*check)(struct cmp_connection *c, __be32 pcr),
+ enum bus_reset_handling bus_reset_handling)
+{
+ struct fw_device *device = fw_parent_device(c->resources.unit);
+ __be32 *buffer = c->resources.buffer;
+ int generation = c->resources.generation;
+ int rcode, errors = 0;
+ __be32 old_arg;
+ int err;
+
+ buffer[0] = c->last_pcr_value;
+ for (;;) {
+ old_arg = buffer[0];
+ buffer[1] = modify(c, buffer[0]);
+
+ rcode = fw_run_transaction(
+ device->card, TCODE_LOCK_COMPARE_SWAP,
+ device->node_id, generation, device->max_speed,
+ CSR_REGISTER_BASE + CSR_IPCR(c->pcr_index),
+ buffer, 8);
+
+ if (rcode == RCODE_COMPLETE) {
+ if (buffer[0] == old_arg) /* success? */
+ break;
+
+ if (check) {
+ err = check(c, buffer[0]);
+ if (err < 0)
+ return err;
+ }
+ } else if (rcode == RCODE_GENERATION)
+ goto bus_reset;
+ else if (rcode_is_permanent_error(rcode) || ++errors >= 3)
+ goto io_error;
+ }
+ c->last_pcr_value = buffer[1];
+
+ return 0;
+
+io_error:
+ cmp_error(c, "transaction failed: %s\n", rcode_string(rcode));
+ return -EIO;
+
+bus_reset:
+ return bus_reset_handling == ABORT_ON_BUS_RESET ? -EAGAIN : 0;
+}
+
+
+/**
+ * cmp_connection_init - initializes a connection manager
+ * @c: the connection manager to initialize
+ * @unit: a unit of the target device
+ * @ipcr_index: the index of the iPCR on the target device
+ */
+int cmp_connection_init(struct cmp_connection *c,
+ struct fw_unit *unit,
+ unsigned int ipcr_index)
+{
+ __be32 impr_be;
+ u32 impr;
+ int err;
+
+ err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
+ CSR_REGISTER_BASE + CSR_IMPR,
+ &impr_be, 4);
+ if (err < 0)
+ return err;
+ impr = be32_to_cpu(impr_be);
+
+ if (ipcr_index >= (impr & IMPR_PLUGS_MASK))
+ return -EINVAL;
+
+ c->connected = false;
+ mutex_init(&c->mutex);
+ fw_iso_resources_init(&c->resources, unit);
+ c->last_pcr_value = cpu_to_be32(0x80000000);
+ c->pcr_index = ipcr_index;
+ c->max_speed = (impr & IMPR_SPEED_MASK) >> IMPR_SPEED_SHIFT;
+ if (c->max_speed == SCODE_BETA)
+ c->max_speed += (impr & IMPR_XSPEED_MASK) >> IMPR_XSPEED_SHIFT;
+
+ return 0;
+}
+EXPORT_SYMBOL(cmp_connection_init);
+
+/**
+ * cmp_connection_destroy - free connection manager resources
+ * @c: the connection manager
+ */
+void cmp_connection_destroy(struct cmp_connection *c)
+{
+ WARN_ON(c->connected);
+ mutex_destroy(&c->mutex);
+ fw_iso_resources_destroy(&c->resources);
+}
+EXPORT_SYMBOL(cmp_connection_destroy);
+
+
+static __be32 ipcr_set_modify(struct cmp_connection *c, __be32 ipcr)
+{
+ ipcr &= ~cpu_to_be32(IPCR_BCAST_CONN |
+ IPCR_P2P_CONN_MASK |
+ IPCR_CHANNEL_MASK);
+ ipcr |= cpu_to_be32(1 << IPCR_P2P_CONN_SHIFT);
+ ipcr |= cpu_to_be32(c->resources.channel << IPCR_CHANNEL_SHIFT);
+
+ return ipcr;
+}
+
+static int ipcr_set_check(struct cmp_connection *c, __be32 ipcr)
+{
+ if (ipcr & cpu_to_be32(IPCR_BCAST_CONN |
+ IPCR_P2P_CONN_MASK)) {
+ cmp_error(c, "plug is already in use\n");
+ return -EBUSY;
+ }
+ if (!(ipcr & cpu_to_be32(IPCR_ONLINE))) {
+ cmp_error(c, "plug is not on-line\n");
+ return -ECONNREFUSED;
+ }
+
+ return 0;
+}
+
+/**
+ * cmp_connection_establish - establish a connection to the target
+ * @c: the connection manager
+ * @max_payload_bytes: the amount of data (including CIP headers) per packet
+ *
+ * This function establishes a point-to-point connection from the local
+ * computer to the target by allocating isochronous resources (channel and
+ * bandwidth) and setting the target's input plug control register. When this
+ * function succeeds, the caller is responsible for starting transmitting
+ * packets.
+ */
+int cmp_connection_establish(struct cmp_connection *c,
+ unsigned int max_payload_bytes)
+{
+ int err;
+
+ if (WARN_ON(c->connected))
+ return -EISCONN;
+
+ c->speed = min(c->max_speed,
+ fw_parent_device(c->resources.unit)->max_speed);
+
+ mutex_lock(&c->mutex);
+
+retry_after_bus_reset:
+ err = fw_iso_resources_allocate(&c->resources,
+ max_payload_bytes, c->speed);
+ if (err < 0)
+ goto err_mutex;
+
+ err = pcr_modify(c, ipcr_set_modify, ipcr_set_check,
+ ABORT_ON_BUS_RESET);
+ if (err == -EAGAIN) {
+ fw_iso_resources_free(&c->resources);
+ goto retry_after_bus_reset;
+ }
+ if (err < 0)
+ goto err_resources;
+
+ c->connected = true;
+
+ mutex_unlock(&c->mutex);
+
+ return 0;
+
+err_resources:
+ fw_iso_resources_free(&c->resources);
+err_mutex:
+ mutex_unlock(&c->mutex);
+
+ return err;
+}
+EXPORT_SYMBOL(cmp_connection_establish);
+
+/**
+ * cmp_connection_update - update the connection after a bus reset
+ * @c: the connection manager
+ *
+ * This function must be called from the driver's .update handler to reestablish
+ * any connection that might have been active.
+ *
+ * Returns zero on success, or a negative error code. On an error, the
+ * connection is broken and the caller must stop transmitting iso packets.
+ */
+int cmp_connection_update(struct cmp_connection *c)
+{
+ int err;
+
+ mutex_lock(&c->mutex);
+
+ if (!c->connected) {
+ mutex_unlock(&c->mutex);
+ return 0;
+ }
+
+ err = fw_iso_resources_update(&c->resources);
+ if (err < 0)
+ goto err_unconnect;
+
+ err = pcr_modify(c, ipcr_set_modify, ipcr_set_check,
+ SUCCEED_ON_BUS_RESET);
+ if (err < 0)
+ goto err_resources;
+
+ mutex_unlock(&c->mutex);
+
+ return 0;
+
+err_resources:
+ fw_iso_resources_free(&c->resources);
+err_unconnect:
+ c->connected = false;
+ mutex_unlock(&c->mutex);
+
+ return err;
+}
+EXPORT_SYMBOL(cmp_connection_update);
+
+
+static __be32 ipcr_break_modify(struct cmp_connection *c, __be32 ipcr)
+{
+ return ipcr & ~cpu_to_be32(IPCR_BCAST_CONN | IPCR_P2P_CONN_MASK);
+}
+
+/**
+ * cmp_connection_break - break the connection to the target
+ * @c: the connection manager
+ *
+ * This function deactives the connection in the target's input plug control
+ * register, and frees the isochronous resources of the connection. Before
+ * calling this function, the caller should cease transmitting packets.
+ */
+void cmp_connection_break(struct cmp_connection *c)
+{
+ int err;
+
+ mutex_lock(&c->mutex);
+
+ if (!c->connected) {
+ mutex_unlock(&c->mutex);
+ return;
+ }
+
+ err = pcr_modify(c, ipcr_break_modify, NULL, SUCCEED_ON_BUS_RESET);
+ if (err < 0)
+ cmp_error(c, "plug is still connected\n");
+
+ fw_iso_resources_free(&c->resources);
+
+ c->connected = false;
+
+ mutex_unlock(&c->mutex);
+}
+EXPORT_SYMBOL(cmp_connection_break);
View
41 sound/firewire/cmp.h
@@ -0,0 +1,41 @@
+#ifndef SOUND_FIREWIRE_CMP_H_INCLUDED
+#define SOUND_FIREWIRE_CMP_H_INCLUDED
+
+#include <linux/mutex.h>
+#include <linux/types.h>
+#include "iso-resources.h"
+
+struct fw_unit;
+
+/**
+ * struct cmp_connection - manages an isochronous connection to a device
+ * @speed: the connection's actual speed
+ *
+ * This structure manages (using CMP) an isochronous stream from the local
+ * computer to a device's input plug (iPCR).
+ *
+ * There is no corresponding oPCR created on the local computer, so it is not
+ * possible to overlay connections on top of this one.
+ */
+struct cmp_connection {
+ int speed;
+ /* private: */
+ bool connected;
+ struct mutex mutex;
+ struct fw_iso_resources resources;
+ __be32 last_pcr_value;
+ unsigned int pcr_index;
+ unsigned int max_speed;
+};
+
+int cmp_connection_init(struct cmp_connection *connection,
+ struct fw_unit *unit,
+ unsigned int ipcr_index);
+void cmp_connection_destroy(struct cmp_connection *connection);
+
+int cmp_connection_establish(struct cmp_connection *connection,
+ unsigned int max_payload);
+int cmp_connection_update(struct cmp_connection *connection);
+void cmp_connection_break(struct cmp_connection *connection);
+
+#endif
View
223 sound/firewire/fcp.c
@@ -0,0 +1,223 @@
+/*
+ * Function Control Protocol (IEC 61883-1) helper functions
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include <linux/device.h>
+#include <linux/firewire.h>
+#include <linux/firewire-constants.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include "fcp.h"
+#include "lib.h"
+
+#define CTS_AVC 0x00
+
+#define ERROR_RETRIES 3
+#define ERROR_DELAY_MS 5
+#define FCP_TIMEOUT_MS 125
+
+static DEFINE_SPINLOCK(transactions_lock);
+static LIST_HEAD(transactions);
+
+enum fcp_state {
+ STATE_PENDING,
+ STATE_BUS_RESET,
+ STATE_COMPLETE,
+};
+
+struct fcp_transaction {
+ struct list_head list;
+ struct fw_unit *unit;
+ void *response_buffer;
+ unsigned int response_size;
+ unsigned int response_match_bytes;
+ enum fcp_state state;
+ wait_queue_head_t wait;
+};
+
+/**
+ * fcp_avc_transaction - send an AV/C command and wait for its response
+ * @unit: a unit on the target device
+ * @command: a buffer containing the command frame; must be DMA-able
+ * @command_size: the size of @command
+ * @response: a buffer for the response frame
+ * @response_size: the maximum size of @response
+ * @response_match_bytes: a bitmap specifying the bytes used to detect the
+ * correct response frame
+ *
+ * This function sends a FCP command frame to the target and waits for the
+ * corresponding response frame to be returned.
+ *
+ * Because it is possible for multiple FCP transactions to be active at the
+ * same time, the correct response frame is detected by the value of certain
+ * bytes. These bytes must be set in @response before calling this function,
+ * and the corresponding bits must be set in @response_match_bytes.
+ *
+ * @command and @response can point to the same buffer.
+ *
+ * Asynchronous operation (INTERIM, NOTIFY) is not supported at the moment.
+ *
+ * Returns the actual size of the response frame, or a negative error code.
+ */
+int fcp_avc_transaction(struct fw_unit *unit,
+ const void *command, unsigned int command_size,
+ void *response, unsigned int response_size,
+ unsigned int response_match_bytes)
+{
+ struct fcp_transaction t;
+ int tcode, ret, tries = 0;
+
+ t.unit = unit;
+ t.response_buffer = response;
+ t.response_size = response_size;
+ t.response_match_bytes = response_match_bytes;
+ t.state = STATE_PENDING;
+ init_waitqueue_head(&t.wait);
+
+ spin_lock_irq(&transactions_lock);
+ list_add_tail(&t.list, &transactions);
+ spin_unlock_irq(&transactions_lock);
+
+ for (;;) {
+ tcode = command_size == 4 ? TCODE_WRITE_QUADLET_REQUEST
+ : TCODE_WRITE_BLOCK_REQUEST;
+ ret = snd_fw_transaction(t.unit, tcode,
+ CSR_REGISTER_BASE + CSR_FCP_COMMAND,
+ (void *)command, command_size);
+ if (ret < 0)
+ break;
+
+ wait_event_timeout(t.wait, t.state != STATE_PENDING,
+ msecs_to_jiffies(FCP_TIMEOUT_MS));
+
+ if (t.state == STATE_COMPLETE) {
+ ret = t.response_size;
+ break;
+ } else if (t.state == STATE_BUS_RESET) {
+ msleep(ERROR_DELAY_MS);
+ } else if (++tries >= ERROR_RETRIES) {
+ dev_err(&t.unit->device, "FCP command timed out\n");
+ ret = -EIO;
+ break;
+ }
+ }
+
+ spin_lock_irq(&transactions_lock);
+ list_del(&t.list);
+ spin_unlock_irq(&transactions_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL(fcp_avc_transaction);
+
+/**
+ * fcp_bus_reset - inform the target handler about a bus reset
+ * @unit: the unit that might be used by fcp_avc_transaction()
+ *
+ * This function must be called from the driver's .update handler to inform
+ * the FCP transaction handler that a bus reset has happened. Any pending FCP
+ * transactions are retried.
+ */
+void fcp_bus_reset(struct fw_unit *unit)
+{
+ struct fcp_transaction *t;
+
+ spin_lock_irq(&transactions_lock);
+ list_for_each_entry(t, &transactions, list) {
+ if (t->unit == unit &&
+ t->state == STATE_PENDING) {
+ t->state = STATE_BUS_RESET;
+ wake_up(&t->wait);
+ }
+ }
+ spin_unlock_irq(&transactions_lock);
+}
+EXPORT_SYMBOL(fcp_bus_reset);
+
+/* checks whether the response matches the masked bytes in response_buffer */
+static bool is_matching_response(struct fcp_transaction *transaction,
+ const void *response, size_t length)
+{
+ const u8 *p1, *p2;
+ unsigned int mask, i;
+
+ p1 = response;
+ p2 = transaction->response_buffer;
+ mask = transaction->response_match_bytes;
+
+ for (i = 0; ; ++i) {
+ if ((mask & 1) && p1[i] != p2[i])
+ return false;
+ mask >>= 1;
+ if (!mask)
+ return true;
+ if (--length == 0)
+ return false;
+ }
+}
+
+static void fcp_response(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 fcp_transaction *t;
+ unsigned long flags;
+
+ if (length < 1 || (*(const u8 *)data & 0xf0) != CTS_AVC)
+ return;
+
+ spin_lock_irqsave(&transactions_lock, flags);
+ list_for_each_entry(t, &transactions, list) {
+ struct fw_device *device = fw_parent_device(t->unit);
+ if (device->card != card ||
+ device->generation != generation)
+ continue;
+ smp_rmb(); /* node_id vs. generation */
+ if (device->node_id != source)
+ continue;
+
+ if (t->state == STATE_PENDING &&
+ is_matching_response(t, data, length)) {
+ t->state = STATE_COMPLETE;
+ t->response_size = min((unsigned int)length,
+ t->response_size);
+ memcpy(t->response_buffer, data, t->response_size);
+ wake_up(&t->wait);
+ }
+ }
+ spin_unlock_irqrestore(&transactions_lock, flags);
+}
+
+static struct fw_address_handler response_register_handler = {
+ .length = 0x200,
+ .address_callback = fcp_response,
+};
+
+static int __init fcp_module_init(void)
+{
+ static const struct fw_address_region response_register_region = {
+ .start = CSR_REGISTER_BASE + CSR_FCP_RESPONSE,
+ .end = CSR_REGISTER_BASE + CSR_FCP_END,
+ };
+
+ fw_core_add_address_handler(&response_register_handler,
+ &response_register_region);
+
+ return 0;
+}
+
+static void __exit fcp_module_exit(void)
+{
+ WARN_ON(!list_empty(&transactions));
+ fw_core_remove_address_handler(&response_register_handler);
+}
+
+module_init(fcp_module_init);
+module_exit(fcp_module_exit);
View
12 sound/firewire/fcp.h
@@ -0,0 +1,12 @@
+#ifndef SOUND_FIREWIRE_FCP_H_INCLUDED
+#define SOUND_FIREWIRE_FCP_H_INCLUDED
+
+struct fw_unit;
+
+int fcp_avc_transaction(struct fw_unit *unit,
+ const void *command, unsigned int command_size,
+ void *response, unsigned int response_size,
+ unsigned int response_match_bytes);
+void fcp_bus_reset(struct fw_unit *unit);
+
+#endif
View
224 sound/firewire/iso-resources.c
@@ -0,0 +1,224 @@
+/*
+ * isochronous resources helper functions
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include <linux/device.h>
+#include <linux/firewire.h>
+#include <linux/firewire-constants.h>
+#include <linux/jiffies.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include "iso-resources.h"
+
+/**
+ * fw_iso_resources_init - initializes a &struct fw_iso_resources
+ * @r: the resource manager to initialize
+ * @unit: the device unit for which the resources will be needed
+ *
+ * If the device does not support all channel numbers, change @r->channels_mask
+ * after calling this function.
+ */
+void fw_iso_resources_init(struct fw_iso_resources *r, struct fw_unit *unit)
+{
+ r->channels_mask = ~0uLL;
+ r->unit = fw_unit_get(unit);
+ mutex_init(&r->mutex);
+ r->allocated = false;
+}
+
+/**
+ * fw_iso_resources_destroy - destroy a resource manager
+ * @r: the resource manager that is no longer needed
+ */
+void fw_iso_resources_destroy(struct fw_iso_resources *r)
+{
+ WARN_ON(r->allocated);
+ mutex_destroy(&r->mutex);
+ fw_unit_put(r->unit);
+}
+
+static unsigned int packet_bandwidth(unsigned int max_payload_bytes, int speed)
+{
+ unsigned int bytes, s400_bytes;
+
+ /* iso packets have three header quadlets and quadlet-aligned payload */
+ bytes = 3 * 4 + ALIGN(max_payload_bytes, 4);
+
+ /* convert to bandwidth units (quadlets at S1600 = bytes at S400) */
+ if (speed <= SCODE_400)
+ s400_bytes = bytes * (1 << (SCODE_400 - speed));
+ else
+ s400_bytes = DIV_ROUND_UP(bytes, 1 << (speed - SCODE_400));
+
+ return s400_bytes;
+}
+
+static int current_bandwidth_overhead(struct fw_card *card)
+{
+ /*
+ * Under the usual pessimistic assumption (cable length 4.5 m), the
+ * isochronous overhead for N cables is 1.797 µs + N * 0.494 µs, or
+ * 88.3 + N * 24.3 in bandwidth units.
+ *
+ * The calculation below tries to deduce N from the current gap count.
+ * If the gap count has been optimized by measuring the actual packet
+ * transmission time, this derived overhead should be near the actual
+ * overhead as well.
+ */
+ return card->gap_count < 63 ? card->gap_count * 97 / 10 + 89 : 512;
+}
+
+static int wait_isoch_resource_delay_after_bus_reset(struct fw_card *card)
+{
+ for (;;) {
+ s64 delay = (card->reset_jiffies + HZ) - get_jiffies_64();
+ if (delay <= 0)
+ return 0;
+ if (schedule_timeout_interruptible(delay) > 0)
+ return -ERESTARTSYS;
+ }
+}
+
+/**
+ * fw_iso_resources_allocate - allocate isochronous channel and bandwidth
+ * @r: the resource manager
+ * @max_payload_bytes: the amount of data (including CIP headers) per packet
+ * @speed: the speed (e.g., SCODE_400) at which the packets will be sent
+ *
+ * This function allocates one isochronous channel and enough bandwidth for the
+ * specified packet size.
+ *
+ * Returns the channel number that the caller must use for streaming, or
+ * a negative error code. Due to potentionally long delays, this function is
+ * interruptible and can return -ERESTARTSYS. On success, the caller is
+ * responsible for calling fw_iso_resources_update() on bus resets, and
+ * fw_iso_resources_free() when the resources are not longer needed.
+ */
+int fw_iso_resources_allocate(struct fw_iso_resources *r,
+ unsigned int max_payload_bytes, int speed)
+{
+ struct fw_card *card = fw_parent_device(r->unit)->card;
+ int bandwidth, channel, err;
+
+ if (WARN_ON(r->allocated))
+ return -EBADFD;
+
+ r->bandwidth = packet_bandwidth(max_payload_bytes, speed);
+
+retry_after_bus_reset:
+ spin_lock_irq(&card->lock);
+ r->generation = card->generation;
+ r->bandwidth_overhead = current_bandwidth_overhead(card);
+ spin_unlock_irq(&card->lock);
+
+ err = wait_isoch_resource_delay_after_bus_reset(card);
+ if (err < 0)
+ return err;
+
+ mutex_lock(&r->mutex);
+
+ bandwidth = r->bandwidth + r->bandwidth_overhead;
+ fw_iso_resource_manage(card, r->generation, r->channels_mask,
+ &channel, &bandwidth, true, r->buffer);
+ if (channel == -EAGAIN) {
+ mutex_unlock(&r->mutex);
+ goto retry_after_bus_reset;
+ }
+ if (channel >= 0) {
+ r->channel = channel;
+ r->allocated = true;
+ } else {
+ if (channel == -EBUSY)
+ dev_err(&r->unit->device,
+ "isochronous resources exhausted\n");
+ else
+ dev_err(&r->unit->device,
+ "isochronous resource allocation failed\n");
+ }
+
+ mutex_unlock(&r->mutex);
+
+ return channel;
+}
+
+/**
+ * fw_iso_resources_update - update resource allocations after a bus reset
+ * @r: the resource manager
+ *
+ * This function must be called from the driver's .update handler to reallocate
+ * any resources that were allocated before the bus reset. It is safe to call
+ * this function if no resources are currently allocated.
+ *
+ * Returns a negative error code on failure. If this happens, the caller must
+ * stop streaming.
+ */
+int fw_iso_resources_update(struct fw_iso_resources *r)
+{
+ struct fw_card *card = fw_parent_device(r->unit)->card;
+ int bandwidth, channel;
+
+ mutex_lock(&r->mutex);
+
+ if (!r->allocated) {
+ mutex_unlock(&r->mutex);
+ return 0;
+ }
+
+ spin_lock_irq(&card->lock);
+ r->generation = card->generation;
+ r->bandwidth_overhead = current_bandwidth_overhead(card);
+ spin_unlock_irq(&card->lock);
+
+ bandwidth = r->bandwidth + r->bandwidth_overhead;
+
+ fw_iso_resource_manage(card, r->generation, 1uLL << r->channel,
+ &channel, &bandwidth, true, r->buffer);
+ /*
+ * When another bus reset happens, pretend that the allocation
+ * succeeded; we will try again for the new generation later.
+ */
+ if (channel < 0 && channel != -EAGAIN) {
+ r->allocated = false;
+ if (channel == -EBUSY)
+ dev_err(&r->unit->device,
+ "isochronous resources exhausted\n");
+ else
+ dev_err(&r->unit->device,
+ "isochronous resource allocation failed\n");
+ }
+
+ mutex_unlock(&r->mutex);
+
+ return channel;
+}
+
+/**
+ * fw_iso_resources_free - frees allocated resources
+ * @r: the resource manager
+ *
+ * This function deallocates the channel and bandwidth, if allocated.
+ */
+void fw_iso_resources_free(struct fw_iso_resources *r)
+{
+ struct fw_card *card = fw_parent_device(r->unit)->card;
+ int bandwidth, channel;
+
+ mutex_lock(&r->mutex);
+
+ if (r->allocated) {
+ bandwidth = r->bandwidth + r->bandwidth_overhead;
+ fw_iso_resource_manage(card, r->generation, 1uLL << r->channel,
+ &channel, &bandwidth, false, r->buffer);
+ if (channel < 0)
+ dev_err(&r->unit->device,
+ "isochronous resource deallocation failed\n");
+
+ r->allocated = false;
+ }
+
+ mutex_unlock(&r->mutex);
+}
View
39 sound/firewire/iso-resources.h
@@ -0,0 +1,39 @@
+#ifndef SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED
+#define SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED
+
+#include <linux/mutex.h>
+#include <linux/types.h>
+
+struct fw_unit;
+
+/**
+ * struct fw_iso_resources - manages channel/bandwidth allocation
+ * @channels_mask: if the device does not support all channel numbers, set this
+ * bit mask to something else than the default (all ones)
+ *
+ * This structure manages (de)allocation of isochronous resources (channel and
+ * bandwidth) for one isochronous stream.
+ */
+struct fw_iso_resources {
+ u64 channels_mask;
+ /* private: */
+ struct fw_unit *unit;
+ struct mutex mutex;
+ unsigned int channel;
+ unsigned int bandwidth; /* in bandwidth units, without overhead */
+ unsigned int bandwidth_overhead;
+ int generation; /* in which allocation is valid */
+ bool allocated;
+ __be32 buffer[2];
+};
+
+void fw_iso_resources_init(struct fw_iso_resources *r,
+ struct fw_unit *unit);
+void fw_iso_resources_destroy(struct fw_iso_resources *r);
+
+int fw_iso_resources_allocate(struct fw_iso_resources *r,
+ unsigned int max_payload_bytes, int speed);
+int fw_iso_resources_update(struct fw_iso_resources *r);
+void fw_iso_resources_free(struct fw_iso_resources *r);
+
+#endif
View
85 sound/firewire/lib.c
@@ -0,0 +1,85 @@
+/*
+ * miscellaneous helper functions
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/firewire.h>
+#include <linux/module.h>
+#include "lib.h"
+
+#define ERROR_RETRY_DELAY_MS 5
+
+/**
+ * rcode_string - convert a firewire result code to a string
+ * @rcode: the result
+ */
+const char *rcode_string(unsigned int rcode)
+{
+ static const char *const names[] = {
+ [RCODE_COMPLETE] = "complete",
+ [RCODE_CONFLICT_ERROR] = "conflict error",
+ [RCODE_DATA_ERROR] = "data error",
+ [RCODE_TYPE_ERROR] = "type error",
+ [RCODE_ADDRESS_ERROR] = "address error",
+ [RCODE_SEND_ERROR] = "send error",
+ [RCODE_CANCELLED] = "cancelled",
+ [RCODE_BUSY] = "busy",
+ [RCODE_GENERATION] = "generation",
+ [RCODE_NO_ACK] = "no ack",
+ };
+
+ if (rcode < ARRAY_SIZE(names) && names[rcode])
+ return names[rcode];
+ else
+ return "unknown";
+}
+EXPORT_SYMBOL(rcode_string);
+
+/**
+ * snd_fw_transaction - send a request and wait for its completion
+ * @unit: the driver's unit on the target device
+ * @tcode: the transaction code
+ * @offset: the address in the target's address space
+ * @buffer: input/output data
+ * @length: length of @buffer
+ *
+ * Submits an asynchronous request to the target device, and waits for the
+ * response. The node ID and the current generation are derived from @unit.
+ * On a bus reset or an error, the transaction is retried a few times.
+ * Returns zero on success, or a negative error code.
+ */
+int snd_fw_transaction(struct fw_unit *unit, int tcode,
+ u64 offset, void *buffer, size_t length)
+{
+ struct fw_device *device = fw_parent_device(unit);
+ int generation, rcode, tries = 0;
+
+ for (;;) {
+ generation = device->generation;
+ smp_rmb(); /* node_id vs. generation */
+ rcode = fw_run_transaction(device->card, tcode,
+ device->node_id, generation,
+ device->max_speed, offset,
+ buffer, length);
+
+ if (rcode == RCODE_COMPLETE)
+ return 0;
+
+ if (rcode_is_permanent_error(rcode) || ++tries >= 3) {
+ dev_err(&unit->device, "transaction failed: %s\n",
+ rcode_string(rcode));
+ return -EIO;
+ }
+
+ msleep(ERROR_RETRY_DELAY_MS);
+ }
+}
+EXPORT_SYMBOL(snd_fw_transaction);
+
+MODULE_DESCRIPTION("FireWire audio helper functions");
+MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
+MODULE_LICENSE("GPL v2");
View
19 sound/firewire/lib.h
@@ -0,0 +1,19 @@
+#ifndef SOUND_FIREWIRE_LIB_H_INCLUDED
+#define SOUND_FIREWIRE_LIB_H_INCLUDED
+
+#include <linux/firewire-constants.h>
+#include <linux/types.h>
+
+struct fw_unit;
+
+int snd_fw_transaction(struct fw_unit *unit, int tcode,
+ u64 offset, void *buffer, size_t length);
+const char *rcode_string(unsigned int rcode);
+
+/* returns true if retrying the transaction would not make sense */
+static inline bool rcode_is_permanent_error(int rcode)
+{
+ return rcode == RCODE_TYPE_ERROR || rcode == RCODE_ADDRESS_ERROR;
+}
+
+#endif
View
74 sound/firewire/packets-buffer.c
@@ -0,0 +1,74 @@
+/*
+ * helpers for managing a buffer for many packets
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include <linux/firewire.h>
+#include <linux/slab.h>
+#include "packets-buffer.h"
+
+/**
+ * iso_packets_buffer_init - allocates the memory for packets
+ * @b: the buffer structure to initialize
+ * @unit: the device at the other end of the stream
+ * @count: the number of packets
+ * @packet_size: the (maximum) size of a packet, in bytes
+ * @direction: %DMA_TO_DEVICE or %DMA_FROM_DEVICE
+ */
+int iso_packets_buffer_init(struct iso_packets_buffer *b, struct fw_unit *unit,
+ unsigned int count, unsigned int packet_size,
+ enum dma_data_direction direction)
+{
+ unsigned int packets_per_page, pages;
+ unsigned int i, page_index, offset_in_page;
+ void *p;
+ int err;
+
+ b->packets = kmalloc(count * sizeof(*b->packets), GFP_KERNEL);
+ if (!b->packets) {
+ err = -ENOMEM;
+ goto error;
+ }
+
+ packet_size = L1_CACHE_ALIGN(packet_size);
+ packets_per_page = PAGE_SIZE / packet_size;
+ if (WARN_ON(!packets_per_page)) {
+ err = -EINVAL;
+ goto error;
+ }
+ pages = DIV_ROUND_UP(count, packets_per_page);
+
+ err = fw_iso_buffer_init(&b->iso_buffer, fw_parent_device(unit)->card,
+ pages, direction);
+ if (err < 0)
+ goto err_packets;
+
+ for (i = 0; i < count; ++i) {
+ page_index = i / packets_per_page;
+ p = page_address(b->iso_buffer.pages[page_index]);
+ offset_in_page = (i % packets_per_page) * packet_size;
+ b->packets[i].buffer = p + offset_in_page;
+ b->packets[i].offset = page_index * PAGE_SIZE + offset_in_page;
+ }
+
+ return 0;
+
+err_packets:
+ kfree(b->packets);
+error:
+ return err;
+}
+
+/**
+ * iso_packets_buffer_destroy - frees packet buffer resources
+ * @b: the buffer structure to free
+ * @unit: the device at the other end of the stream
+ */
+void iso_packets_buffer_destroy(struct iso_packets_buffer *b,
+ struct fw_unit *unit)
+{
+ fw_iso_buffer_destroy(&b->iso_buffer, fw_parent_device(unit)->card);
+ kfree(b->packets);
+}
View
26 sound/firewire/packets-buffer.h
@@ -0,0 +1,26 @@
+#ifndef SOUND_FIREWIRE_PACKETS_BUFFER_H_INCLUDED
+#define SOUND_FIREWIRE_PACKETS_BUFFER_H_INCLUDED
+
+#include <linux/dma-mapping.h>
+#include <linux/firewire.h>
+
+/**
+ * struct iso_packets_buffer - manages a buffer for many packets
+ * @iso_buffer: the memory containing the packets
+ * @packets: an array, with each element pointing to one packet
+ */
+struct iso_packets_buffer {
+ struct fw_iso_buffer iso_buffer;
+ struct {
+ void *buffer;
+ unsigned int offset;
+ } *packets;
+};
+
+int iso_packets_buffer_init(struct iso_packets_buffer *b, struct fw_unit *unit,
+ unsigned int count, unsigned int packet_size,
+ enum dma_data_direction direction);
+void iso_packets_buffer_destroy(struct iso_packets_buffer *b,
+ struct fw_unit *unit);
+
+#endif
View
855 sound/firewire/speakers.c
@@ -0,0 +1,855 @@
+/*
+ * OXFW970-based speakers driver
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include <linux/device.h>
+#include <linux/firewire.h>
+#include <linux/firewire-constants.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <sound/control.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include "cmp.h"
+#include "fcp.h"
+#include "amdtp.h"
+#include "lib.h"
+
+#define OXFORD_FIRMWARE_ID_ADDRESS (CSR_REGISTER_BASE + 0x50000)
+/* 0x970?vvvv or 0x971?vvvv, where vvvv = firmware version */
+
+#define OXFORD_HARDWARE_ID_ADDRESS (CSR_REGISTER_BASE + 0x90020)
+#define OXFORD_HARDWARE_ID_OXFW970 0x39443841
+#define OXFORD_HARDWARE_ID_OXFW971 0x39373100
+
+#define VENDOR_GRIFFIN 0x001292
+#define VENDOR_LACIE 0x00d04b
+
+#define SPECIFIER_1394TA 0x00a02d
+#define VERSION_AVC 0x010001
+
+struct device_info {
+ const char *driver_name;
+ const char *short_name;
+ const char *long_name;
+ int (*pcm_constraints)(struct snd_pcm_runtime *runtime);
+ unsigned int mixer_channels;
+ u8 mute_fb_id;
+ u8 volume_fb_id;
+};
+
+struct fwspk {
+ struct snd_card *card;
+ struct fw_unit *unit;
+ const struct device_info *device_info;
+ struct snd_pcm_substream *pcm;
+ struct mutex mutex;
+ struct cmp_connection connection;
+ struct amdtp_out_stream stream;
+ bool stream_running;
+ bool mute;
+ s16 volume[6];
+ s16 volume_min;
+ s16 volume_max;
+};
+
+MODULE_DESCRIPTION("FireWire speakers driver");
+MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
+MODULE_LICENSE("GPL v2");
+
+static int firewave_rate_constraint(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ static unsigned int stereo_rates[] = { 48000, 96000 };
+ struct snd_interval *channels =
+ hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+ struct snd_interval *rate =
+ hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+
+ /* two channels work only at 48/96 kHz */
+ if (snd_interval_max(channels) < 6)
+ return snd_interval_list(rate, 2, stereo_rates, 0);
+ return 0;
+}
+
+static int firewave_channels_constraint(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ static const struct snd_interval all_channels = { .min = 6, .max = 6 };
+ struct snd_interval *rate =
+ hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+ struct snd_interval *channels =
+ hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+
+ /* 32/44.1 kHz work only with all six channels */
+ if (snd_interval_max(rate) < 48000)
+ return snd_interval_refine(channels, &all_channels);
+ return 0;
+}
+
+static int firewave_constraints(struct snd_pcm_runtime *runtime)
+{
+ static unsigned int channels_list[] = { 2, 6 };
+ static struct snd_pcm_hw_constraint_list channels_list_constraint = {
+ .count = 2,
+ .list = channels_list,
+ };
+ int err;
+
+ runtime->hw.rates = SNDRV_PCM_RATE_32000 |
+ SNDRV_PCM_RATE_44100 |
+ SNDRV_PCM_RATE_48000 |
+ SNDRV_PCM_RATE_96000;
+ runtime->hw.channels_max = 6;
+
+ err = snd_pcm_hw_constraint_list(runtime, 0,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ &channels_list_constraint);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+ firewave_rate_constraint, NULL,
+ SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+ firewave_channels_constraint, NULL,
+ SNDRV_PCM_HW_PARAM_RATE, -1);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int lacie_speakers_constraints(struct snd_pcm_runtime *runtime)
+{
+ runtime->hw.rates = SNDRV_PCM_RATE_32000 |
+ SNDRV_PCM_RATE_44100 |
+ SNDRV_PCM_RATE_48000 |
+ SNDRV_PCM_RATE_88200 |
+ SNDRV_PCM_RATE_96000;
+
+ return 0;
+}
+
+static int fwspk_open(struct snd_pcm_substream *substream)
+{
+ static const struct snd_pcm_hardware hardware = {
+ .info = SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_BATCH |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER,
+ .formats = AMDTP_OUT_PCM_FORMAT_BITS,
+ .channels_min = 2,
+ .channels_max = 2,
+ .buffer_bytes_max = 4 * 1024 * 1024,
+ .period_bytes_min = 1,
+ .period_bytes_max = UINT_MAX,
+ .periods_min = 1,
+ .periods_max = UINT_MAX,
+ };
+ struct fwspk *fwspk = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+
+ runtime->hw = hardware;
+
+ err = fwspk->device_info->pcm_constraints(runtime);
+ if (err < 0)
+ return err;
+ err = snd_pcm_limit_hw_rates(runtime);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_minmax(runtime,
+ SNDRV_PCM_HW_PARAM_PERIOD_TIME,
+ 5000, 8192000);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int fwspk_close(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+static void fwspk_stop_stream(struct fwspk *fwspk)
+{
+ if (fwspk->stream_running) {
+ amdtp_out_stream_stop(&fwspk->stream);
+ cmp_connection_break(&fwspk->connection);
+ fwspk->stream_running = false;
+ }
+}
+
+static int fwspk_set_rate(struct fwspk *fwspk, unsigned int sfc)
+{
+ u8 *buf;
+ int err;
+
+ buf = kmalloc(8, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ buf[0] = 0x00; /* AV/C, CONTROL */
+ buf[1] = 0xff; /* unit */
+ buf[2] = 0x19; /* INPUT PLUG SIGNAL FORMAT */
+ buf[3] = 0x00; /* plug 0 */
+ buf[4] = 0x90; /* format: audio */
+ buf[5] = 0x00 | sfc; /* AM824, frequency */
+ buf[6] = 0xff; /* SYT (not used) */
+ buf[7] = 0xff;
+
+ err = fcp_avc_transaction(fwspk->unit, buf, 8, buf, 8,
+ BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5));
+ if (err < 0)
+ goto error;
+ if (err < 6 || buf[0] != 0x09 /* ACCEPTED */) {
+ dev_err(&fwspk->unit->device, "failed to set sample rate\n");
+ err = -EIO;
+ goto error;
+ }
+
+ err = 0;
+
+error:
+ kfree(buf);
+
+ return err;
+}
+
+static int fwspk_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct fwspk *fwspk = substream->private_data;
+ int err;
+
+ mutex_lock(&fwspk->mutex);
+ fwspk_stop_stream(fwspk);
+ mutex_unlock(&fwspk->mutex);
+
+ err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+ if (err < 0)
+ goto error;
+
+ amdtp_out_stream_set_rate(&fwspk->stream, params_rate(hw_params));
+ amdtp_out_stream_set_pcm(&fwspk->stream, params_channels(hw_params));
+
+ amdtp_out_stream_set_pcm_format(&fwspk->stream,
+ params_format(hw_params));
+
+ err = fwspk_set_rate(fwspk, fwspk->stream.sfc);
+ if (err < 0)
+ goto err_buffer;
+
+ return 0;
+
+err_buffer:
+ snd_pcm_lib_free_vmalloc_buffer(substream);
+error:
+ return err;
+}
+
+static int fwspk_hw_free(struct snd_pcm_substream *substream)
+{
+ struct fwspk *fwspk = substream->private_data;
+
+ mutex_lock(&fwspk->mutex);
+ fwspk_stop_stream(fwspk);
+ mutex_unlock(&fwspk->mutex);
+
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+static int fwspk_prepare(struct snd_pcm_substream *substream)
+{
+ struct fwspk *fwspk = substream->private_data;
+ int err;
+
+ mutex_lock(&fwspk->mutex);
+
+ if (!fwspk->stream_running) {
+ err = cmp_connection_establish(&fwspk->connection,
+ amdtp_out_stream_get_max_payload(&fwspk->stream));
+ if (err < 0)
+ goto err_mutex;
+
+ err = amdtp_out_stream_start(&fwspk->stream,
+ fwspk->connection.resources.channel,
+ fwspk->connection.speed);
+ if (err < 0)
+ goto err_connection;
+
+ fwspk->stream_running = true;
+ }
+
+ mutex_unlock(&fwspk->mutex);
+
+ amdtp_out_stream_pcm_prepare(&fwspk->stream);
+
+ return 0;
+
+err_connection:
+ cmp_connection_break(&fwspk->connection);
+err_mutex:
+ mutex_unlock(&fwspk->mutex);
+
+ return err;
+}
+
+static int fwspk_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct fwspk *fwspk = substream->private_data;
+ struct snd_pcm_substream *pcm;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ pcm = substream;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ pcm = NULL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ amdtp_out_stream_pcm_trigger(&fwspk->stream, pcm);
+ return 0;
+}
+
+static snd_pcm_uframes_t fwspk_pointer(struct snd_pcm_substream *substream)
+{
+ struct fwspk *fwspk = substream->private_data;
+
+ return amdtp_out_stream_pcm_pointer(&fwspk->stream);
+}
+
+static int fwspk_create_pcm(struct fwspk *fwspk)
+{
+ static struct snd_pcm_ops ops = {
+ .open = fwspk_open,
+ .close = fwspk_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = fwspk_hw_params,
+ .hw_free = fwspk_hw_free,
+ .prepare = fwspk_prepare,
+ .trigger = fwspk_trigger,
+ .pointer = fwspk_pointer,
+ .page = snd_pcm_lib_get_vmalloc_page,
+ .mmap = snd_pcm_lib_mmap_vmalloc,
+ };
+ struct snd_pcm *pcm;
+ int err;
+
+ err = snd_pcm_new(fwspk->card, "OXFW970", 0, 1, 0, &pcm);
+ if (err < 0)
+ return err;
+ pcm->private_data = fwspk;
+ strcpy(pcm->name, fwspk->device_info->short_name);
+ fwspk->pcm = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+ fwspk->pcm->ops = &ops;
+ return 0;
+}
+
+enum control_action { CTL_READ, CTL_WRITE };
+enum control_attribute {
+ CTL_MIN = 0x02,
+ CTL_MAX = 0x03,
+ CTL_CURRENT = 0x10,
+};
+
+static int fwspk_mute_command(struct fwspk *fwspk, bool *value,
+ enum control_action action)
+{
+ u8 *buf;
+ u8 response_ok;
+ int err;
+
+ buf = kmalloc(11, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ if (action == CTL_READ) {
+ buf[0] = 0x01; /* AV/C, STATUS */
+ response_ok = 0x0c; /* STABLE */
+ } else {
+ buf[0] = 0x00; /* AV/C, CONTROL */
+ response_ok = 0x09; /* ACCEPTED */
+ }
+ buf[1] = 0x08; /* audio unit 0 */
+ buf[2] = 0xb8; /* FUNCTION BLOCK */
+ buf[3] = 0x81; /* function block type: feature */
+ buf[4] = fwspk->device_info->mute_fb_id; /* function block ID */
+ buf[5] = 0x10; /* control attribute: current */
+ buf[6] = 0x02; /* selector length */
+ buf[7] = 0x00; /* audio channel number */
+ buf[8] = 0x01; /* control selector: mute */
+ buf[9] = 0x01; /* control data length */
+ if (action == CTL_READ)
+ buf[10] = 0xff;
+ else
+ buf[10] = *value ? 0x70 : 0x60;
+
+ err = fcp_avc_transaction(fwspk->unit, buf, 11, buf, 11, 0x3fe);
+ if (err < 0)
+ goto error;
+ if (err < 11) {
+ dev_err(&fwspk->unit->device, "short FCP response\n");
+ err = -EIO;
+ goto error;
+ }
+ if (buf[0] != response_ok) {
+ dev_err(&fwspk->unit->device, "mute command failed\n");
+ err = -EIO;
+ goto error;
+ }
+ if (action == CTL_READ)
+ *value = buf[10] == 0x70;
+
+ err = 0;
+
+error:
+ kfree(buf);
+
+ return err;
+}
+
+static int fwspk_volume_command(struct fwspk *fwspk, s16 *value,
+ unsigned int channel,
+ enum control_attribute attribute,
+ enum control_action action)
+{
+ u8 *buf;
+ u8 response_ok;
+ int err;
+
+ buf = kmalloc(12, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ if (action == CTL_READ) {
+ buf[0] = 0x01; /* AV/C, STATUS */
+ response_ok = 0x0c; /* STABLE */
+ } else {
+ buf[0] = 0x00; /* AV/C, CONTROL */
+ response_ok = 0x09; /* ACCEPTED */
+ }
+ buf[1] = 0x08; /* audio unit 0 */
+ buf[2] = 0xb8; /* FUNCTION BLOCK */
+ buf[3] = 0x81; /* function block type: feature */
+ buf[4] = fwspk->device_info->volume_fb_id; /* function block ID */
+ buf[5] = attribute; /* control attribute */
+ buf[6] = 0x02; /* selector length */
+ buf[7] = channel; /* audio channel number */
+ buf[8] = 0x02; /* control selector: volume */
+ buf[9] = 0x02; /* control data length */
+ if (action == CTL_READ) {
+ buf[10] = 0xff;
+ buf[11] = 0xff;
+ } else {
+ buf[10] = *value >> 8;
+ buf[11] = *value;
+ }
+
+ err = fcp_avc_transaction(fwspk->unit, buf, 12, buf, 12, 0x3fe);
+ if (err < 0)
+ goto error;
+ if (err < 12) {
+ dev_err(&fwspk->unit->device, "short FCP response\n");
+ err = -EIO;
+ goto error;
+ }
+ if (buf[0] != response_ok) {
+ dev_err(&fwspk->unit->device, "volume command failed\n");
+ err = -EIO;
+ goto error;
+ }
+ if (action == CTL_READ)
+ *value = (buf[10] << 8) | buf[11];
+
+ err = 0;
+
+error:
+ kfree(buf);
+
+ return err;
+}
+
+static int fwspk_mute_get(struct snd_kcontrol *control,
+ struct snd_ctl_elem_value *value)
+{
+ struct fwspk *fwspk = control->private_data;
+
+ value->value.integer.value[0] = !fwspk->mute;
+
+ return 0;
+}
+
+static int fwspk_mute_put(struct snd_kcontrol *control,
+ struct snd_ctl_elem_value *value)
+{
+ struct fwspk *fwspk = control->private_data;
+ bool mute;
+ int err;
+
+ mute = !value->value.integer.value[0];
+
+ if (mute == fwspk->mute)
+ return 0;
+
+ err = fwspk_mute_command(fwspk, &mute, CTL_WRITE);
+ if (err < 0)
+ return err;
+ fwspk->mute = mute;
+
+ return 1;
+}
+
+static int fwspk_volume_info(struct snd_kcontrol *control,
+ struct snd_ctl_elem_info *info)
+{
+ struct fwspk *fwspk = control->private_data;
+
+ info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ info->count = fwspk->device_info->mixer_channels;
+ info->value.integer.min = fwspk->volume_min;
+ info->value.integer.max = fwspk->volume_max;
+
+ return 0;
+}
+
+static const u8 channel_map[6] = { 0, 1, 4, 5, 2, 3 };
+
+static int fwspk_volume_get(struct snd_kcontrol *control,
+ struct snd_ctl_elem_value *value)
+{
+ struct fwspk *fwspk = control->private_data;
+ unsigned int i;
+
+ for (i = 0; i < fwspk->device_info->mixer_channels; ++i)
+ value->value.integer.value[channel_map[i]] = fwspk->volume[i];
+
+ return 0;
+}
+
+static int fwspk_volume_put(struct snd_kcontrol *control,
+ struct snd_ctl_elem_value *value)
+{
+ struct fwspk *fwspk = control->private_data;
+ unsigned int i, changed_channels;
+ bool equal_values = true;
+ s16 volume;
+ int err;
+
+ for (i = 0; i < fwspk->device_info->mixer_channels; ++i) {
+ if (value->value.integer.value[i] < fwspk->volume_min ||
+ value->value.integer.value[i] > fwspk->volume_max)
+ return -EINVAL;
+ if (value->value.integer.value[i] !=
+ value->value.integer.value[0])
+ equal_values = false;
+ }
+
+ changed_channels = 0;
+ for (i = 0; i < fwspk->device_info->mixer_channels; ++i)
+ if (value->value.integer.value[channel_map[i]] !=
+ fwspk->volume[i])
+ changed_channels |= 1 << (i + 1);
+
+ if (equal_values && changed_channels != 0)
+ changed_channels = 1 << 0;
+
+ for (i = 0; i <= fwspk->device_info->mixer_channels; ++i) {
+ volume = value->value.integer.value[channel_map[i ? i - 1 : 0]];
+ if (changed_channels & (1 << i)) {
+ err = fwspk_volume_command(fwspk, &volume, i,
+ CTL_CURRENT, CTL_WRITE);
+ if (err < 0)
+ return err;
+ }
+ if (i > 0)
+ fwspk->volume[i - 1] = volume;
+ }
+
+ return changed_channels != 0;
+}
+
+static int fwspk_create_mixer(struct fwspk *fwspk)
+{
+ static const struct snd_kcontrol_new controls[] = {
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = "PCM Playback Switch",
+ .info = snd_ctl_boolean_mono_info,
+ .get = fwspk_mute_get,
+ .put = fwspk_mute_put,
+ },
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = "PCM Playback Volume",
+ .info = fwspk_volume_info,
+ .get = fwspk_volume_get,
+ .put = fwspk_volume_put,
+ },
+ };
+ unsigned int i, first_ch;
+ int err;
+
+ err = fwspk_volume_command(fwspk, &fwspk->volume_min,
+ 0, CTL_MIN, CTL_READ);
+ if (err < 0)
+ return err;
+ err = fwspk_volume_command(fwspk, &fwspk->volume_max,
+ 0, CTL_MAX, CTL_READ);
+ if (err < 0)
+ return err;
+
+ err = fwspk_mute_command(fwspk, &fwspk->mute, CTL_READ);
+ if (err < 0)
+ return err;
+
+ first_ch = fwspk->device_info->mixer_channels == 1 ? 0 : 1;
+ for (i = 0; i < fwspk->device_info->mixer_channels; ++i) {
+ err = fwspk_volume_command(fwspk, &fwspk->volume[i],
+ first_ch + i, CTL_CURRENT, CTL_READ);
+ if (err < 0)
+ return err;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(controls); ++i) {
+ err = snd_ctl_add(fwspk->card,
+ snd_ctl_new1(&controls[i], fwspk));
+ if (err < 0)
+ return err;
+ }
+
+ return 0;
+}
+
+static u32 fwspk_read_firmware_version(struct fw_unit *unit)
+{
+ __be32 data;
+ int err;
+
+ err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
+ OXFORD_FIRMWARE_ID_ADDRESS, &data, 4);
+ return err >= 0 ? be32_to_cpu(data) : 0;
+}
+
+static void fwspk_card_free(struct snd_card *card)
+{
+ struct fwspk *fwspk = card->private_data;
+ struct fw_device *dev = fw_parent_device(fwspk->unit);
+
+ amdtp_out_stream_destroy(&fwspk->stream);
+ cmp_connection_destroy(&fwspk->connection);
+ fw_unit_put(fwspk->unit);
+ fw_device_put(dev);
+ mutex_destroy(&fwspk->mutex);
+}
+
+static