sound/firewire/speakers.c - kernel/msm-4.19 - Gitiles

 /*
  * 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 (amdtp_out_streaming_error(&fwspk->stream))
 		fwspk_stop_stream(fwspk);

 	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 const struct device_info *__devinit fwspk_detect(struct fw_device *dev)
 {
 	static const struct device_info griffin_firewave = {
 		.driver_name = "FireWave",
 		.short_name  = "FireWave",
 		.long_name   = "Griffin FireWave Surround",
 		.pcm_constraints = firewave_constraints,
 		.mixer_channels = 6,
 		.mute_fb_id   = 0x01,
 		.volume_fb_id = 0x02,
 	};
 	static const struct device_info lacie_speakers = {
 		.driver_name = "FWSpeakers",
 		.short_name  = "FireWire Speakers",
 		.long_name   = "LaCie FireWire Speakers",
 		.pcm_constraints = lacie_speakers_constraints,
 		.mixer_channels = 1,
 		.mute_fb_id   = 0x01,
 		.volume_fb_id = 0x01,
 	};
 	struct fw_csr_iterator i;
 	int key, value;

 	fw_csr_iterator_init(&i, dev->config_rom);
 	while (fw_csr_iterator_next(&i, &key, &value))
 		if (key == CSR_VENDOR)
 			switch (value) {
 			case VENDOR_GRIFFIN:
 				return &griffin_firewave;
 			case VENDOR_LACIE:
 				return &lacie_speakers;
 			}

 	return NULL;
 }

 static int __devinit fwspk_probe(struct device *unit_dev)
 {
 	struct fw_unit *unit = fw_unit(unit_dev);
 	struct fw_device *fw_dev = fw_parent_device(unit);
 	struct snd_card *card;
 	struct fwspk *fwspk;
 	u32 firmware;
 	int err;

 	err = snd_card_create(-1, NULL, THIS_MODULE, sizeof(*fwspk), &card);
 	if (err < 0)
 		return err;
 	snd_card_set_dev(card, unit_dev);

 	fwspk = card->private_data;
 	fwspk->card = card;
 	mutex_init(&fwspk->mutex);
 	fw_device_get(fw_dev);
 	fwspk->unit = fw_unit_get(unit);
 	fwspk->device_info = fwspk_detect(fw_dev);
 	if (!fwspk->device_info) {
 		err = -ENODEV;
 		goto err_unit;
 	}

 	err = cmp_connection_init(&fwspk->connection, unit, 0);
 	if (err < 0)
 		goto err_unit;

 	err = amdtp_out_stream_init(&fwspk->stream, unit, CIP_NONBLOCKING);
 	if (err < 0)
 		goto err_connection;

 	card->private_free = fwspk_card_free;

 	strcpy(card->driver, fwspk->device_info->driver_name);
 	strcpy(card->shortname, fwspk->device_info->short_name);
 	firmware = fwspk_read_firmware_version(unit);
 	snprintf(card->longname, sizeof(card->longname),
 		 "%s (OXFW%x %04x), GUID %08x%08x at %s, S%d",
 		 fwspk->device_info->long_name,
 		 firmware >> 20, firmware & 0xffff,
 		 fw_dev->config_rom[3], fw_dev->config_rom[4],
 		 dev_name(&unit->device), 100 << fw_dev->max_speed);
 	strcpy(card->mixername, "OXFW970");

 	err = fwspk_create_pcm(fwspk);
 	if (err < 0)
 		goto error;

 	err = fwspk_create_mixer(fwspk);
 	if (err < 0)
 		goto error;

 	err = snd_card_register(card);
 	if (err < 0)
 		goto error;

 	dev_set_drvdata(unit_dev, fwspk);

 	return 0;

 err_connection:
 	cmp_connection_destroy(&fwspk->connection);
 err_unit:
 	fw_unit_put(fwspk->unit);
 	fw_device_put(fw_dev);
 	mutex_destroy(&fwspk->mutex);
 error:
 	snd_card_free(card);
 	return err;
 }

 static int __devexit fwspk_remove(struct device *dev)
 {
 	struct fwspk *fwspk = dev_get_drvdata(dev);

 	snd_card_disconnect(fwspk->card);

 	mutex_lock(&fwspk->mutex);
 	amdtp_out_stream_pcm_abort(&fwspk->stream);
 	fwspk_stop_stream(fwspk);
 	mutex_unlock(&fwspk->mutex);

 	snd_card_free_when_closed(fwspk->card);

 	return 0;
 }

 static void fwspk_bus_reset(struct fw_unit *unit)
 {
 	struct fwspk *fwspk = dev_get_drvdata(&unit->device);

 	fcp_bus_reset(fwspk->unit);

 	if (cmp_connection_update(&fwspk->connection) < 0) {
 		mutex_lock(&fwspk->mutex);
 		amdtp_out_stream_pcm_abort(&fwspk->stream);
 		fwspk_stop_stream(fwspk);
 		mutex_unlock(&fwspk->mutex);
 		return;
 	}

 	amdtp_out_stream_update(&fwspk->stream);
 }

 static const struct ieee1394_device_id fwspk_id_table[] = {
 	{
 		.match_flags  = IEEE1394_MATCH_VENDOR_ID |
 				IEEE1394_MATCH_MODEL_ID |
 				IEEE1394_MATCH_SPECIFIER_ID |
 				IEEE1394_MATCH_VERSION,
 		.vendor_id    = VENDOR_GRIFFIN,
 		.model_id     = 0x00f970,
 		.specifier_id = SPECIFIER_1394TA,
 		.version      = VERSION_AVC,
 	},
 	{
 		.match_flags  = IEEE1394_MATCH_VENDOR_ID |
 				IEEE1394_MATCH_MODEL_ID |
 				IEEE1394_MATCH_SPECIFIER_ID |
 				IEEE1394_MATCH_VERSION,
 		.vendor_id    = VENDOR_LACIE,
 		.model_id     = 0x00f970,
 		.specifier_id = SPECIFIER_1394TA,
 		.version      = VERSION_AVC,
 	},
 	{ }
 };
 MODULE_DEVICE_TABLE(ieee1394, fwspk_id_table);

 static struct fw_driver fwspk_driver = {
 	.driver   = {
 		.owner	= THIS_MODULE,
 		.name	= KBUILD_MODNAME,
 		.bus	= &fw_bus_type,
 		.probe	= fwspk_probe,
 		.remove	= __devexit_p(fwspk_remove),
 	},
 	.update   = fwspk_bus_reset,
 	.id_table = fwspk_id_table,
 };

 static int __init alsa_fwspk_init(void)
 {
 	return driver_register(&fwspk_driver.driver);
 }

 static void __exit alsa_fwspk_exit(void)
 {
 	driver_unregister(&fwspk_driver.driver);
 }

 module_init(alsa_fwspk_init);
 module_exit(alsa_fwspk_exit);
	/*
	* 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 (amdtp_out_streaming_error(&fwspk->stream))
	fwspk_stop_stream(fwspk);

	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 const struct device_info __devinit fwspk_detect(struct fw_device dev)
	{
	static const struct device_info griffin_firewave = {
	.driver_name = "FireWave",
	.short_name = "FireWave",
	.long_name = "Griffin FireWave Surround",
	.pcm_constraints = firewave_constraints,
	.mixer_channels = 6,
	.mute_fb_id = 0x01,
	.volume_fb_id = 0x02,
	};
	static const struct device_info lacie_speakers = {
	.driver_name = "FWSpeakers",
	.short_name = "FireWire Speakers",
	.long_name = "LaCie FireWire Speakers",
	.pcm_constraints = lacie_speakers_constraints,
	.mixer_channels = 1,
	.mute_fb_id = 0x01,
	.volume_fb_id = 0x01,
	};
	struct fw_csr_iterator i;
	int key, value;

	fw_csr_iterator_init(&i, dev->config_rom);
	while (fw_csr_iterator_next(&i, &key, &value))
	if (key == CSR_VENDOR)
	switch (value) {
	case VENDOR_GRIFFIN:
	return &griffin_firewave;
	case VENDOR_LACIE:
	return &lacie_speakers;
	}

	return NULL;
	}

	static int __devinit fwspk_probe(struct device *unit_dev)
	{
	struct fw_unit *unit = fw_unit(unit_dev);
	struct fw_device *fw_dev = fw_parent_device(unit);
	struct snd_card *card;
	struct fwspk *fwspk;
	u32 firmware;
	int err;

	err = snd_card_create(-1, NULL, THIS_MODULE, sizeof(*fwspk), &card);
	if (err < 0)
	return err;
	snd_card_set_dev(card, unit_dev);

	fwspk = card->private_data;
	fwspk->card = card;
	mutex_init(&fwspk->mutex);
	fw_device_get(fw_dev);
	fwspk->unit = fw_unit_get(unit);
	fwspk->device_info = fwspk_detect(fw_dev);
	if (!fwspk->device_info) {
	err = -ENODEV;
	goto err_unit;
	}

	err = cmp_connection_init(&fwspk->connection, unit, 0);
	if (err < 0)
	goto err_unit;

	err = amdtp_out_stream_init(&fwspk->stream, unit, CIP_NONBLOCKING);
	if (err < 0)
	goto err_connection;

	card->private_free = fwspk_card_free;

	strcpy(card->driver, fwspk->device_info->driver_name);
	strcpy(card->shortname, fwspk->device_info->short_name);
	firmware = fwspk_read_firmware_version(unit);
	snprintf(card->longname, sizeof(card->longname),
	"%s (OXFW%x %04x), GUID %08x%08x at %s, S%d",
	fwspk->device_info->long_name,
	firmware >> 20, firmware & 0xffff,
	fw_dev->config_rom[3], fw_dev->config_rom[4],
	dev_name(&unit->device), 100 << fw_dev->max_speed);
	strcpy(card->mixername, "OXFW970");

	err = fwspk_create_pcm(fwspk);
	if (err < 0)
	goto error;

	err = fwspk_create_mixer(fwspk);
	if (err < 0)
	goto error;

	err = snd_card_register(card);
	if (err < 0)
	goto error;

	dev_set_drvdata(unit_dev, fwspk);

	return 0;

	err_connection:
	cmp_connection_destroy(&fwspk->connection);
	err_unit:
	fw_unit_put(fwspk->unit);
	fw_device_put(fw_dev);
	mutex_destroy(&fwspk->mutex);
	error:
	snd_card_free(card);
	return err;
	}

	static int __devexit fwspk_remove(struct device *dev)
	{
	struct fwspk *fwspk = dev_get_drvdata(dev);

	snd_card_disconnect(fwspk->card);

	mutex_lock(&fwspk->mutex);
	amdtp_out_stream_pcm_abort(&fwspk->stream);
	fwspk_stop_stream(fwspk);
	mutex_unlock(&fwspk->mutex);

	snd_card_free_when_closed(fwspk->card);

	return 0;
	}

	static void fwspk_bus_reset(struct fw_unit *unit)
	{
	struct fwspk *fwspk = dev_get_drvdata(&unit->device);

	fcp_bus_reset(fwspk->unit);

	if (cmp_connection_update(&fwspk->connection) < 0) {
	mutex_lock(&fwspk->mutex);
	amdtp_out_stream_pcm_abort(&fwspk->stream);
	fwspk_stop_stream(fwspk);
	mutex_unlock(&fwspk->mutex);
	return;
	}

	amdtp_out_stream_update(&fwspk->stream);
	}

	static const struct ieee1394_device_id fwspk_id_table[] = {
	{
	.match_flags = IEEE1394_MATCH_VENDOR_ID \|
	IEEE1394_MATCH_MODEL_ID \|
	IEEE1394_MATCH_SPECIFIER_ID \|
	IEEE1394_MATCH_VERSION,
	.vendor_id = VENDOR_GRIFFIN,
	.model_id = 0x00f970,
	.specifier_id = SPECIFIER_1394TA,
	.version = VERSION_AVC,
	},
	{
	.match_flags = IEEE1394_MATCH_VENDOR_ID \|
	IEEE1394_MATCH_MODEL_ID \|
	IEEE1394_MATCH_SPECIFIER_ID \|
	IEEE1394_MATCH_VERSION,
	.vendor_id = VENDOR_LACIE,
	.model_id = 0x00f970,
	.specifier_id = SPECIFIER_1394TA,
	.version = VERSION_AVC,
	},
	{ }
	};
	MODULE_DEVICE_TABLE(ieee1394, fwspk_id_table);

	static struct fw_driver fwspk_driver = {
	.driver = {
	.owner = THIS_MODULE,
	.name = KBUILD_MODNAME,
	.bus = &fw_bus_type,
	.probe = fwspk_probe,
	.remove = __devexit_p(fwspk_remove),
	},
	.update = fwspk_bus_reset,
	.id_table = fwspk_id_table,
	};

	static int __init alsa_fwspk_init(void)
	{
	return driver_register(&fwspk_driver.driver);
	}

	static void __exit alsa_fwspk_exit(void)
	{
	driver_unregister(&fwspk_driver.driver);
	}

	module_init(alsa_fwspk_init);
	module_exit(alsa_fwspk_exit);