[thirdparty/linux.git] / sound / firewire / isight.c

/*
 * Apple iSight audio driver
 *
 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include <asm/byteorder.h>
#include <linux/delay.h>
#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/string.h>
#include <sound/control.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/tlv.h>
#include "lib.h"
#include "iso-resources.h"
#include "packets-buffer.h"

#define OUI_APPLE		0x000a27
#define MODEL_APPLE_ISIGHT	0x000008
#define SW_ISIGHT_AUDIO		0x000010

#define REG_AUDIO_ENABLE	0x000
#define  AUDIO_ENABLE		0x80000000
#define REG_DEF_AUDIO_GAIN	0x204
#define REG_GAIN_RAW_START	0x210
#define REG_GAIN_RAW_END	0x214
#define REG_GAIN_DB_START	0x218
#define REG_GAIN_DB_END		0x21c
#define REG_SAMPLE_RATE_INQUIRY	0x280
#define REG_ISO_TX_CONFIG	0x300
#define  SPEED_SHIFT		16
#define REG_SAMPLE_RATE		0x400
#define  RATE_48000		0x80000000
#define REG_GAIN		0x500
#define REG_MUTE		0x504

#define MAX_FRAMES_PER_PACKET	475

#define QUEUE_LENGTH		20

struct isight {
	struct snd_card *card;
	struct fw_unit *unit;
	struct fw_device *device;
	u64 audio_base;
	struct fw_address_handler iris_handler;
	struct snd_pcm_substream *pcm;
	struct mutex mutex;
	struct iso_packets_buffer buffer;
	struct fw_iso_resources resources;
	struct fw_iso_context *context;
	bool pcm_active;
	bool pcm_running;
	bool first_packet;
	int packet_index;
	u32 total_samples;
	unsigned int buffer_pointer;
	unsigned int period_counter;
	s32 gain_min, gain_max;
	unsigned int gain_tlv[4];
};

struct audio_payload {
	__be32 sample_count;
	__be32 signature;
	__be32 sample_total;
	__be32 reserved;
	__be16 samples[2 * MAX_FRAMES_PER_PACKET];
};

MODULE_DESCRIPTION("iSight audio driver");
MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
MODULE_LICENSE("GPL v2");

static struct fw_iso_packet audio_packet = {
	.payload_length = sizeof(struct audio_payload),
	.interrupt = 1,
	.header_length = 4,
};

static void isight_update_pointers(struct isight *isight, unsigned int count)
{
	struct snd_pcm_runtime *runtime = isight->pcm->runtime;
	unsigned int ptr;

	smp_wmb(); /* update buffer data before buffer pointer */

	ptr = isight->buffer_pointer;
	ptr += count;
	if (ptr >= runtime->buffer_size)
		ptr -= runtime->buffer_size;
	ACCESS_ONCE(isight->buffer_pointer) = ptr;

	isight->period_counter += count;
	if (isight->period_counter >= runtime->period_size) {
		isight->period_counter -= runtime->period_size;
		snd_pcm_period_elapsed(isight->pcm);
	}
}

static void isight_samples(struct isight *isight,
			   const __be16 *samples, unsigned int count)
{
	struct snd_pcm_runtime *runtime;
	unsigned int count1;

	if (!ACCESS_ONCE(isight->pcm_running))
		return;

	runtime = isight->pcm->runtime;
	if (isight->buffer_pointer + count <= runtime->buffer_size) {
		memcpy(runtime->dma_area + isight->buffer_pointer * 4,
		       samples, count * 4);
	} else {
		count1 = runtime->buffer_size - isight->buffer_pointer;
		memcpy(runtime->dma_area + isight->buffer_pointer * 4,
		       samples, count1 * 4);
		samples += count1 * 2;
		memcpy(runtime->dma_area, samples, (count - count1) * 4);
	}

	isight_update_pointers(isight, count);
}

static void isight_pcm_abort(struct isight *isight)
{
	unsigned long flags;

	if (ACCESS_ONCE(isight->pcm_active)) {
		snd_pcm_stream_lock_irqsave(isight->pcm, flags);
		if (snd_pcm_running(isight->pcm))
			snd_pcm_stop(isight->pcm, SNDRV_PCM_STATE_XRUN);
		snd_pcm_stream_unlock_irqrestore(isight->pcm, flags);
	}
}

static void isight_dropped_samples(struct isight *isight, unsigned int total)
{
	struct snd_pcm_runtime *runtime;
	u32 dropped;
	unsigned int count1;

	if (!ACCESS_ONCE(isight->pcm_running))
		return;

	runtime = isight->pcm->runtime;
	dropped = total - isight->total_samples;
	if (dropped < runtime->buffer_size) {
		if (isight->buffer_pointer + dropped <= runtime->buffer_size) {
			memset(runtime->dma_area + isight->buffer_pointer * 4,
			       0, dropped * 4);
		} else {
			count1 = runtime->buffer_size - isight->buffer_pointer;
			memset(runtime->dma_area + isight->buffer_pointer * 4,
			       0, count1 * 4);
			memset(runtime->dma_area, 0, (dropped - count1) * 4);
		}
		isight_update_pointers(isight, dropped);
	} else {
		isight_pcm_abort(isight);
	}
}

static void isight_packet(struct fw_iso_context *context, u32 cycle,
			  size_t header_length, void *header, void *data)
{
	struct isight *isight = data;
	const struct audio_payload *payload;
	unsigned int index, length, count, total;
	int err;

	if (isight->packet_index < 0)
		return;
	index = isight->packet_index;
	payload = isight->buffer.packets[index].buffer;
	length = be32_to_cpup(header) >> 16;

	if (likely(length >= 16 &&
		   payload->signature == cpu_to_be32(0x73676874/*"sght"*/))) {
		count = be32_to_cpu(payload->sample_count);
		if (likely(count <= (length - 16) / 4)) {
			total = be32_to_cpu(payload->sample_total);
			if (unlikely(total != isight->total_samples)) {
				if (!isight->first_packet)
					isight_dropped_samples(isight, total);
				isight->first_packet = false;
				isight->total_samples = total;
			}

			isight_samples(isight, payload->samples, count);
			isight->total_samples += count;
		}
	}

	err = fw_iso_context_queue(isight->context, &audio_packet,
				   &isight->buffer.iso_buffer,
				   isight->buffer.packets[index].offset);
	if (err < 0) {
		dev_err(&isight->unit->device, "queueing error: %d\n", err);
		isight_pcm_abort(isight);
		isight->packet_index = -1;
		return;
	}

	if (++index >= QUEUE_LENGTH)
		index = 0;
	isight->packet_index = index;
}

static int isight_connect(struct isight *isight)
{
	int ch, err, rcode, errors = 0;
	__be32 value;

retry_after_bus_reset:
	ch = fw_iso_resources_allocate(&isight->resources,
				       sizeof(struct audio_payload),
				       isight->device->max_speed);
	if (ch < 0) {
		err = ch;
		goto error;
	}

	value = cpu_to_be32(ch | (isight->device->max_speed << SPEED_SHIFT));
	for (;;) {
		rcode = fw_run_transaction(
				isight->device->card,
				TCODE_WRITE_QUADLET_REQUEST,
				isight->device->node_id,
				isight->resources.generation,
				isight->device->max_speed,
				isight->audio_base + REG_ISO_TX_CONFIG,
				&value, 4);
		if (rcode == RCODE_COMPLETE) {
			return 0;
		} else if (rcode == RCODE_GENERATION) {
			fw_iso_resources_free(&isight->resources);
			goto retry_after_bus_reset;
		} else if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
			err = -EIO;
			goto err_resources;
		}
		msleep(5);
	}

err_resources:
	fw_iso_resources_free(&isight->resources);
error:
	return err;
}

static int isight_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 = SNDRV_PCM_FMTBIT_S16_BE,
		.rates = SNDRV_PCM_RATE_48000,
		.rate_min = 48000,
		.rate_max = 48000,
		.channels_min = 2,
		.channels_max = 2,
		.buffer_bytes_max = 4 * 1024 * 1024,
		.period_bytes_min = MAX_FRAMES_PER_PACKET * 4,
		.period_bytes_max = 1024 * 1024,
		.periods_min = 2,
		.periods_max = UINT_MAX,
	};
	struct isight *isight = substream->private_data;

	substream->runtime->hw = hardware;

	return iso_packets_buffer_init(&isight->buffer, isight->unit,
				       QUEUE_LENGTH,
				       sizeof(struct audio_payload),
				       DMA_FROM_DEVICE);
}

static int isight_close(struct snd_pcm_substream *substream)
{
	struct isight *isight = substream->private_data;

	iso_packets_buffer_destroy(&isight->buffer, isight->unit);

	return 0;
}

static int isight_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *hw_params)
{
	struct isight *isight = substream->private_data;
	int err;

	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
					       params_buffer_bytes(hw_params));
	if (err < 0)
		return err;

	ACCESS_ONCE(isight->pcm_active) = true;

	return 0;
}

static int reg_read(struct isight *isight, int offset, __be32 *value)
{
	return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
				  isight->audio_base + offset, value, 4);
}

static int reg_write(struct isight *isight, int offset, __be32 value)
{
	return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
				  isight->audio_base + offset, &value, 4);
}

static void isight_stop_streaming(struct isight *isight)
{
	if (!isight->context)
		return;

	fw_iso_context_stop(isight->context);
	fw_iso_context_destroy(isight->context);
	isight->context = NULL;
	fw_iso_resources_free(&isight->resources);
	reg_write(isight, REG_AUDIO_ENABLE, 0);
}

static int isight_hw_free(struct snd_pcm_substream *substream)
{
	struct isight *isight = substream->private_data;

	ACCESS_ONCE(isight->pcm_active) = false;

	mutex_lock(&isight->mutex);
	isight_stop_streaming(isight);
	mutex_unlock(&isight->mutex);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
}

static int isight_start_streaming(struct isight *isight)
{
	unsigned int i;
	int err;

	if (isight->context) {
		if (isight->packet_index < 0)
			isight_stop_streaming(isight);
		else
			return 0;
	}

	err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000));
	if (err < 0)
		goto error;

	err = isight_connect(isight);
	if (err < 0)
		goto error;

	err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE));
	if (err < 0)
		goto err_resources;

	isight->context = fw_iso_context_create(isight->device->card,
						FW_ISO_CONTEXT_RECEIVE,
						isight->resources.channel,
						isight->device->max_speed,
						4, isight_packet, isight);
	if (IS_ERR(isight->context)) {
		err = PTR_ERR(isight->context);
		isight->context = NULL;
		goto err_resources;
	}

	for (i = 0; i < QUEUE_LENGTH; ++i) {
		err = fw_iso_context_queue(isight->context, &audio_packet,
					   &isight->buffer.iso_buffer,
					   isight->buffer.packets[i].offset);
		if (err < 0)
			goto err_context;
	}

	isight->first_packet = true;
	isight->packet_index = 0;

	err = fw_iso_context_start(isight->context, -1, 0,
				   FW_ISO_CONTEXT_MATCH_ALL_TAGS/*?*/);
	if (err < 0)
		goto err_context;

	return 0;

err_context:
	fw_iso_context_destroy(isight->context);
	isight->context = NULL;
err_resources:
	fw_iso_resources_free(&isight->resources);
	reg_write(isight, REG_AUDIO_ENABLE, 0);
error:
	return err;
}

static int isight_prepare(struct snd_pcm_substream *substream)
{
	struct isight *isight = substream->private_data;
	int err;

	isight->buffer_pointer = 0;
	isight->period_counter = 0;

	mutex_lock(&isight->mutex);
	err = isight_start_streaming(isight);
	mutex_unlock(&isight->mutex);

	return err;
}

static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct isight *isight = substream->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		ACCESS_ONCE(isight->pcm_running) = true;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		ACCESS_ONCE(isight->pcm_running) = false;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
{
	struct isight *isight = substream->private_data;

	return ACCESS_ONCE(isight->buffer_pointer);
}

static int isight_create_pcm(struct isight *isight)
{
	static struct snd_pcm_ops ops = {
		.open      = isight_open,
		.close     = isight_close,
		.ioctl     = snd_pcm_lib_ioctl,
		.hw_params = isight_hw_params,
		.hw_free   = isight_hw_free,
		.prepare   = isight_prepare,
		.trigger   = isight_trigger,
		.pointer   = isight_pointer,
		.page      = snd_pcm_lib_get_vmalloc_page,
		.mmap      = snd_pcm_lib_mmap_vmalloc,
	};
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
	if (err < 0)
		return err;
	pcm->private_data = isight;
	strcpy(pcm->name, "iSight");
	isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
	isight->pcm->ops = &ops;

	return 0;
}

static int isight_gain_info(struct snd_kcontrol *ctl,
			    struct snd_ctl_elem_info *info)
{
	struct isight *isight = ctl->private_data;

	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	info->count = 1;
	info->value.integer.min = isight->gain_min;
	info->value.integer.max = isight->gain_max;

	return 0;
}

static int isight_gain_get(struct snd_kcontrol *ctl,
			   struct snd_ctl_elem_value *value)
{
	struct isight *isight = ctl->private_data;
	__be32 gain;
	int err;

	err = reg_read(isight, REG_GAIN, &gain);
	if (err < 0)
		return err;

	value->value.integer.value[0] = (s32)be32_to_cpu(gain);

	return 0;
}

static int isight_gain_put(struct snd_kcontrol *ctl,
			   struct snd_ctl_elem_value *value)
{
	struct isight *isight = ctl->private_data;

	if (value->value.integer.value[0] < isight->gain_min ||
	    value->value.integer.value[0] > isight->gain_max)
		return -EINVAL;

	return reg_write(isight, REG_GAIN,
			 cpu_to_be32(value->value.integer.value[0]));
}

static int isight_mute_get(struct snd_kcontrol *ctl,
			   struct snd_ctl_elem_value *value)
{
	struct isight *isight = ctl->private_data;
	__be32 mute;
	int err;

	err = reg_read(isight, REG_MUTE, &mute);
	if (err < 0)
		return err;

	value->value.integer.value[0] = !mute;

	return 0;
}

static int isight_mute_put(struct snd_kcontrol *ctl,
			   struct snd_ctl_elem_value *value)
{
	struct isight *isight = ctl->private_data;

	return reg_write(isight, REG_MUTE,
			 (__force __be32)!value->value.integer.value[0]);
}

static int isight_create_mixer(struct isight *isight)
{
	static const struct snd_kcontrol_new gain_control = {
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = "Mic Capture Volume",
		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
			  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
		.info = isight_gain_info,
		.get = isight_gain_get,
		.put = isight_gain_put,
	};
	static const struct snd_kcontrol_new mute_control = {
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = "Mic Capture Switch",
		.info = snd_ctl_boolean_mono_info,
		.get = isight_mute_get,
		.put = isight_mute_put,
	};
	__be32 value;
	struct snd_kcontrol *ctl;
	int err;

	err = reg_read(isight, REG_GAIN_RAW_START, &value);
	if (err < 0)
		return err;
	isight->gain_min = be32_to_cpu(value);

	err = reg_read(isight, REG_GAIN_RAW_END, &value);
	if (err < 0)
		return err;
	isight->gain_max = be32_to_cpu(value);

	isight->gain_tlv[0] = SNDRV_CTL_TLVT_DB_MINMAX;
	isight->gain_tlv[1] = 2 * sizeof(unsigned int);

	err = reg_read(isight, REG_GAIN_DB_START, &value);
	if (err < 0)
		return err;
	isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100;

	err = reg_read(isight, REG_GAIN_DB_END, &value);
	if (err < 0)
		return err;
	isight->gain_tlv[3] = (s32)be32_to_cpu(value) * 100;

	ctl = snd_ctl_new1(&gain_control, isight);
	if (ctl)
		ctl->tlv.p = isight->gain_tlv;
	err = snd_ctl_add(isight->card, ctl);
	if (err < 0)
		return err;

	err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
	if (err < 0)
		return err;

	return 0;
}

static void isight_card_free(struct snd_card *card)
{
	struct isight *isight = card->private_data;

	fw_iso_resources_destroy(&isight->resources);
	fw_unit_put(isight->unit);
	fw_device_put(isight->device);
	mutex_destroy(&isight->mutex);
}

static u64 get_unit_base(struct fw_unit *unit)
{
	struct fw_csr_iterator i;
	int key, value;

	fw_csr_iterator_init(&i, unit->directory);
	while (fw_csr_iterator_next(&i, &key, &value))
		if (key == CSR_OFFSET)
			return CSR_REGISTER_BASE + value * 4;
	return 0;
}

static int isight_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 isight *isight;
	int err;

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

	isight = card->private_data;
	isight->card = card;
	mutex_init(&isight->mutex);
	isight->unit = fw_unit_get(unit);
	isight->device = fw_device_get(fw_dev);
	isight->audio_base = get_unit_base(unit);
	if (!isight->audio_base) {
		dev_err(&unit->device, "audio unit base not found\n");
		err = -ENXIO;
		goto err_unit;
	}
	fw_iso_resources_init(&isight->resources, unit);

	card->private_free = isight_card_free;

	strcpy(card->driver, "iSight");
	strcpy(card->shortname, "Apple iSight");
	snprintf(card->longname, sizeof(card->longname),
		 "Apple iSight (GUID %08x%08x) at %s, S%d",
		 fw_dev->config_rom[3], fw_dev->config_rom[4],
		 dev_name(&unit->device), 100 << fw_dev->max_speed);
	strcpy(card->mixername, "iSight");

	err = isight_create_pcm(isight);
	if (err < 0)
		goto error;

	err = isight_create_mixer(isight);
	if (err < 0)
		goto error;

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

	dev_set_drvdata(unit_dev, isight);

	return 0;

err_unit:
	fw_unit_put(isight->unit);
	fw_device_put(isight->device);
	mutex_destroy(&isight->mutex);
error:
	snd_card_free(card);
	return err;
}

static int isight_remove(struct device *dev)
{
	struct isight *isight = dev_get_drvdata(dev);

	mutex_lock(&isight->mutex);
	isight_pcm_abort(isight);
	snd_card_disconnect(isight->card);
	isight_stop_streaming(isight);
	mutex_unlock(&isight->mutex);

	snd_card_free_when_closed(isight->card);

	return 0;
}

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

	mutex_lock(&isight->mutex);
	if (fw_iso_resources_update(&isight->resources) < 0) {
		isight_pcm_abort(isight);
		isight_stop_streaming(isight);
	}
	mutex_unlock(&isight->mutex);
}

static const struct ieee1394_device_id isight_id_table[] = {
	{
		.match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
				IEEE1394_MATCH_VERSION,
		.specifier_id = OUI_APPLE,
		.version      = SW_ISIGHT_AUDIO,
	},
	{ }
};
MODULE_DEVICE_TABLE(ieee1394, isight_id_table);

static struct fw_driver isight_driver = {
	.driver   = {
		.owner	= THIS_MODULE,
		.name	= KBUILD_MODNAME,
		.bus	= &fw_bus_type,
		.probe	= isight_probe,
		.remove	= isight_remove,
	},
	.update   = isight_bus_reset,
	.id_table = isight_id_table,
};

static int __init alsa_isight_init(void)
{
	return driver_register(&isight_driver.driver);
}

static void __exit alsa_isight_exit(void)
{
	driver_unregister(&isight_driver.driver);
}

module_init(alsa_isight_init);
module_exit(alsa_isight_exit);
Commit	Line	Data
3a691b28 CL	1	/*
	2	* Apple iSight audio driver
	3	*
	4	* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
	5	* Licensed under the terms of the GNU General Public License, version 2.
	6	*/
	7
ac34dad2	8	#include <asm/byteorder.h>
3a691b28 CL	9	#include <linux/delay.h>
	10	#include <linux/device.h>
	11	#include <linux/firewire.h>
	12	#include <linux/firewire-constants.h>
	13	#include <linux/module.h>
	14	#include <linux/mod_devicetable.h>
	15	#include <linux/mutex.h>
	16	#include <linux/string.h>
	17	#include <sound/control.h>
	18	#include <sound/core.h>
	19	#include <sound/initval.h>
	20	#include <sound/pcm.h>
	21	#include <sound/tlv.h>
	22	#include "lib.h"
	23	#include "iso-resources.h"
	24	#include "packets-buffer.h"
	25
	26	#define OUI_APPLE 0x000a27
	27	#define MODEL_APPLE_ISIGHT 0x000008
	28	#define SW_ISIGHT_AUDIO 0x000010
	29
	30	#define REG_AUDIO_ENABLE 0x000
	31	#define AUDIO_ENABLE 0x80000000
	32	#define REG_DEF_AUDIO_GAIN 0x204
	33	#define REG_GAIN_RAW_START 0x210
	34	#define REG_GAIN_RAW_END 0x214
	35	#define REG_GAIN_DB_START 0x218
	36	#define REG_GAIN_DB_END 0x21c
	37	#define REG_SAMPLE_RATE_INQUIRY 0x280
	38	#define REG_ISO_TX_CONFIG 0x300
	39	#define SPEED_SHIFT 16
	40	#define REG_SAMPLE_RATE 0x400
	41	#define RATE_48000 0x80000000
	42	#define REG_GAIN 0x500
	43	#define REG_MUTE 0x504
	44
	45	#define MAX_FRAMES_PER_PACKET 475
	46
	47	#define QUEUE_LENGTH 20
	48
	49	struct isight {
	50	struct snd_card *card;
	51	struct fw_unit *unit;
	52	struct fw_device *device;
	53	u64 audio_base;
	54	struct fw_address_handler iris_handler;
	55	struct snd_pcm_substream *pcm;
	56	struct mutex mutex;
	57	struct iso_packets_buffer buffer;
	58	struct fw_iso_resources resources;
	59	struct fw_iso_context *context;
03c29680	60	bool pcm_active;
3a691b28 CL	61	bool pcm_running;
	62	bool first_packet;
	63	int packet_index;
	64	u32 total_samples;
	65	unsigned int buffer_pointer;
	66	unsigned int period_counter;
	67	s32 gain_min, gain_max;
	68	unsigned int gain_tlv[4];
	69	};
	70
	71	struct audio_payload {
	72	__be32 sample_count;
	73	__be32 signature;
	74	__be32 sample_total;
	75	__be32 reserved;
	76	__be16 samples[2 * MAX_FRAMES_PER_PACKET];
	77	};
	78
	79	MODULE_DESCRIPTION("iSight audio driver");
	80	MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
	81	MODULE_LICENSE("GPL v2");
	82
	83	static struct fw_iso_packet audio_packet = {
	84	.payload_length = sizeof(struct audio_payload),
	85	.interrupt = 1,
f2934cd4	86	.header_length = 4,
3a691b28 CL	87	};
	88
	89	static void isight_update_pointers(struct isight *isight, unsigned int count)
	90	{
	91	struct snd_pcm_runtime *runtime = isight->pcm->runtime;
	92	unsigned int ptr;
	93
	94	smp_wmb(); /* update buffer data before buffer pointer */
	95
	96	ptr = isight->buffer_pointer;
	97	ptr += count;
	98	if (ptr >= runtime->buffer_size)
	99	ptr -= runtime->buffer_size;
	100	ACCESS_ONCE(isight->buffer_pointer) = ptr;
	101
	102	isight->period_counter += count;
	103	if (isight->period_counter >= runtime->period_size) {
	104	isight->period_counter -= runtime->period_size;
	105	snd_pcm_period_elapsed(isight->pcm);
	106	}
	107	}
	108
	109	static void isight_samples(struct isight *isight,
	110	const __be16 *samples, unsigned int count)
	111	{
	112	struct snd_pcm_runtime *runtime;
	113	unsigned int count1;
	114
	115	if (!ACCESS_ONCE(isight->pcm_running))
	116	return;
	117
	118	runtime = isight->pcm->runtime;
	119	if (isight->buffer_pointer + count <= runtime->buffer_size) {
	120	memcpy(runtime->dma_area + isight->buffer_pointer * 4,
	121	samples, count * 4);
	122	} else {
	123	count1 = runtime->buffer_size - isight->buffer_pointer;
	124	memcpy(runtime->dma_area + isight->buffer_pointer * 4,
	125	samples, count1 * 4);
	126	samples += count1 * 2;
	127	memcpy(runtime->dma_area, samples, (count - count1) * 4);
	128	}
	129
	130	isight_update_pointers(isight, count);
	131	}
	132
	133	static void isight_pcm_abort(struct isight *isight)
	134	{
	135	unsigned long flags;
	136
03c29680 CL	137	if (ACCESS_ONCE(isight->pcm_active)) {
	138	snd_pcm_stream_lock_irqsave(isight->pcm, flags);
	139	if (snd_pcm_running(isight->pcm))
	140	snd_pcm_stop(isight->pcm, SNDRV_PCM_STATE_XRUN);
	141	snd_pcm_stream_unlock_irqrestore(isight->pcm, flags);
	142	}
3a691b28 CL	143	}
	144
	145	static void isight_dropped_samples(struct isight *isight, unsigned int total)
	146	{
	147	struct snd_pcm_runtime *runtime;
	148	u32 dropped;
	149	unsigned int count1;
	150
	151	if (!ACCESS_ONCE(isight->pcm_running))
	152	return;
	153
	154	runtime = isight->pcm->runtime;
	155	dropped = total - isight->total_samples;
	156	if (dropped < runtime->buffer_size) {
	157	if (isight->buffer_pointer + dropped <= runtime->buffer_size) {
	158	memset(runtime->dma_area + isight->buffer_pointer * 4,
	159	0, dropped * 4);
	160	} else {
	161	count1 = runtime->buffer_size - isight->buffer_pointer;
	162	memset(runtime->dma_area + isight->buffer_pointer * 4,
	163	0, count1 * 4);
	164	memset(runtime->dma_area, 0, (dropped - count1) * 4);
	165	}
	166	isight_update_pointers(isight, dropped);
	167	} else {
	168	isight_pcm_abort(isight);
	169	}
	170	}
	171
	172	static void isight_packet(struct fw_iso_context *context, u32 cycle,
	173	size_t header_length, void header, void data)
	174	{
	175	struct isight *isight = data;
	176	const struct audio_payload *payload;
	177	unsigned int index, length, count, total;
	178	int err;
	179
	180	if (isight->packet_index < 0)
	181	return;
	182	index = isight->packet_index;
	183	payload = isight->buffer.packets[index].buffer;
	184	length = be32_to_cpup(header) >> 16;
	185
	186	if (likely(length >= 16 &&
	187	payload->signature == cpu_to_be32(0x73676874/"sght"/))) {
	188	count = be32_to_cpu(payload->sample_count);
	189	if (likely(count <= (length - 16) / 4)) {
	190	total = be32_to_cpu(payload->sample_total);
	191	if (unlikely(total != isight->total_samples)) {
	192	if (!isight->first_packet)
	193	isight_dropped_samples(isight, total);
	194	isight->first_packet = false;
	195	isight->total_samples = total;
	196	}
	197
	198	isight_samples(isight, payload->samples, count);
	199	isight->total_samples += count;
	200	}
	201	}
	202
3a691b28 CL	203	err = fw_iso_context_queue(isight->context, &audio_packet,
	204	&isight->buffer.iso_buffer,
	205	isight->buffer.packets[index].offset);
	206	if (err < 0) {
	207	dev_err(&isight->unit->device, "queueing error: %d\n", err);
	208	isight_pcm_abort(isight);
	209	isight->packet_index = -1;
	210	return;
	211	}
	212
898732d1 CL	213	if (++index >= QUEUE_LENGTH)
898732d1 CL	214	index = 0;
3a691b28 CL	215	isight->packet_index = index;
	216	}
	217
	218	static int isight_connect(struct isight *isight)
	219	{
	220	int ch, err, rcode, errors = 0;
	221	__be32 value;
	222
	223	retry_after_bus_reset:
	224	ch = fw_iso_resources_allocate(&isight->resources,
	225	sizeof(struct audio_payload),
	226	isight->device->max_speed);
	227	if (ch < 0) {
	228	err = ch;
	229	goto error;
	230	}
	231
	232	value = cpu_to_be32(ch \| (isight->device->max_speed << SPEED_SHIFT));
	233	for (;;) {
	234	rcode = fw_run_transaction(
	235	isight->device->card,
	236	TCODE_WRITE_QUADLET_REQUEST,
	237	isight->device->node_id,
	238	isight->resources.generation,
	239	isight->device->max_speed,
	240	isight->audio_base + REG_ISO_TX_CONFIG,
	241	&value, 4);
	242	if (rcode == RCODE_COMPLETE) {
	243	return 0;
	244	} else if (rcode == RCODE_GENERATION) {
	245	fw_iso_resources_free(&isight->resources);
	246	goto retry_after_bus_reset;
	247	} else if (rcode_is_permanent_error(rcode) \|\| ++errors >= 3) {
	248	err = -EIO;
	249	goto err_resources;
	250	}
	251	msleep(5);
	252	}
	253
	254	err_resources:
	255	fw_iso_resources_free(&isight->resources);
	256	error:
	257	return err;
	258	}
	259
	260	static int isight_open(struct snd_pcm_substream *substream)
	261	{
	262	static const struct snd_pcm_hardware hardware = {
	263	.info = SNDRV_PCM_INFO_MMAP \|
	264	SNDRV_PCM_INFO_MMAP_VALID \|
	265	SNDRV_PCM_INFO_BATCH \|
	266	SNDRV_PCM_INFO_INTERLEAVED \|
	267	SNDRV_PCM_INFO_BLOCK_TRANSFER,
	268	.formats = SNDRV_PCM_FMTBIT_S16_BE,
	269	.rates = SNDRV_PCM_RATE_48000,
	270	.rate_min = 48000,
	271	.rate_max = 48000,
	272	.channels_min = 2,
	273	.channels_max = 2,
	274	.buffer_bytes_max = 4 * 1024 * 1024,
	275	.period_bytes_min = MAX_FRAMES_PER_PACKET * 4,
	276	.period_bytes_max = 1024 * 1024,
	277	.periods_min = 2,
	278	.periods_max = UINT_MAX,
279	};
280	struct isight *isight = substream->private_data;
281
282	substream->runtime->hw = hardware;
283
284	return iso_packets_buffer_init(&isight->buffer, isight->unit,
285	QUEUE_LENGTH,
286	sizeof(struct audio_payload),
287	DMA_FROM_DEVICE);
288	}
289
290	static int isight_close(struct snd_pcm_substream *substream)
291	{
292	struct isight *isight = substream->private_data;
293
294	iso_packets_buffer_destroy(&isight->buffer, isight->unit);
295
296	return 0;
297	}
298
299	static int isight_hw_params(struct snd_pcm_substream *substream,
300	struct snd_pcm_hw_params *hw_params)
301	{
03c29680 CL	302	struct isight *isight = substream->private_data;
	303	int err;
	304
	305	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
	306	params_buffer_bytes(hw_params));
	307	if (err < 0)
	308	return err;
	309
	310	ACCESS_ONCE(isight->pcm_active) = true;
	311
	312	return 0;
3a691b28 CL	313	}
3a691b28 CL	314
ac34dad2	315	static int reg_read(struct isight isight, int offset, __be32 value)
3a691b28	316	{
ac34dad2 SR	317	return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
	318	isight->audio_base + offset, value, 4);
	319	}
	320
	321	static int reg_write(struct isight *isight, int offset, __be32 value)
	322	{
	323	return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
	324	isight->audio_base + offset, &value, 4);
	325	}
3a691b28	326
ac34dad2 SR	327	static void isight_stop_streaming(struct isight *isight)
ac34dad2 SR	328	{
3a691b28 CL	329	if (!isight->context)
	330	return;
	331
	332	fw_iso_context_stop(isight->context);
	333	fw_iso_context_destroy(isight->context);
	334	isight->context = NULL;
3a691b28	335	fw_iso_resources_free(&isight->resources);
ac34dad2	336	reg_write(isight, REG_AUDIO_ENABLE, 0);
3a691b28 CL	337	}
	338
	339	static int isight_hw_free(struct snd_pcm_substream *substream)
	340	{
	341	struct isight *isight = substream->private_data;
	342
03c29680 CL	343	ACCESS_ONCE(isight->pcm_active) = false;
03c29680 CL	344
3a691b28 CL	345	mutex_lock(&isight->mutex);
	346	isight_stop_streaming(isight);
	347	mutex_unlock(&isight->mutex);
	348
	349	return snd_pcm_lib_free_vmalloc_buffer(substream);
	350	}
	351
	352	static int isight_start_streaming(struct isight *isight)
	353	{
3a691b28 CL	354	unsigned int i;
	355	int err;
	356
	357	if (isight->context) {
	358	if (isight->packet_index < 0)
	359	isight_stop_streaming(isight);
	360	else
	361	return 0;
	362	}
	363
ac34dad2	364	err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000));
3a691b28	365	if (err < 0)
ac34dad2	366	goto error;
3a691b28 CL	367
	368	err = isight_connect(isight);
	369	if (err < 0)
	370	goto error;
	371
ac34dad2	372	err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE));
8839eeda SR	373	if (err < 0)
	374	goto err_resources;
	375
3a691b28 CL	376	isight->context = fw_iso_context_create(isight->device->card,
	377	FW_ISO_CONTEXT_RECEIVE,
	378	isight->resources.channel,
	379	isight->device->max_speed,
	380	4, isight_packet, isight);
	381	if (IS_ERR(isight->context)) {
	382	err = PTR_ERR(isight->context);
	383	isight->context = NULL;
	384	goto err_resources;
	385	}
	386
	387	for (i = 0; i < QUEUE_LENGTH; ++i) {
	388	err = fw_iso_context_queue(isight->context, &audio_packet,
	389	&isight->buffer.iso_buffer,
	390	isight->buffer.packets[i].offset);
	391	if (err < 0)
	392	goto err_context;
	393	}
	394
	395	isight->first_packet = true;
	396	isight->packet_index = 0;
	397
	398	err = fw_iso_context_start(isight->context, -1, 0,
	399	FW_ISO_CONTEXT_MATCH_ALL_TAGS/?/);
	400	if (err < 0)
	401	goto err_context;
	402
	403	return 0;
	404
	405	err_context:
	406	fw_iso_context_destroy(isight->context);
	407	isight->context = NULL;
	408	err_resources:
	409	fw_iso_resources_free(&isight->resources);
ac34dad2	410	reg_write(isight, REG_AUDIO_ENABLE, 0);
3a691b28 CL	411	error:
	412	return err;
	413	}
	414
	415	static int isight_prepare(struct snd_pcm_substream *substream)
	416	{
	417	struct isight *isight = substream->private_data;
	418	int err;
	419
	420	isight->buffer_pointer = 0;
	421	isight->period_counter = 0;
	422
	423	mutex_lock(&isight->mutex);
	424	err = isight_start_streaming(isight);
	425	mutex_unlock(&isight->mutex);
	426
	427	return err;
	428	}
	429
	430	static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
	431	{
	432	struct isight *isight = substream->private_data;
	433
	434	switch (cmd) {
	435	case SNDRV_PCM_TRIGGER_START:
	436	ACCESS_ONCE(isight->pcm_running) = true;
	437	break;
	438	case SNDRV_PCM_TRIGGER_STOP:
	439	ACCESS_ONCE(isight->pcm_running) = false;
	440	break;
	441	default:
	442	return -EINVAL;
	443	}
	444	return 0;
	445	}
	446
	447	static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
	448	{
	449	struct isight *isight = substream->private_data;
	450
	451	return ACCESS_ONCE(isight->buffer_pointer);
	452	}
	453
	454	static int isight_create_pcm(struct isight *isight)
	455	{
	456	static struct snd_pcm_ops ops = {
	457	.open = isight_open,
	458	.close = isight_close,
	459	.ioctl = snd_pcm_lib_ioctl,
	460	.hw_params = isight_hw_params,
	461	.hw_free = isight_hw_free,
	462	.prepare = isight_prepare,
	463	.trigger = isight_trigger,
	464	.pointer = isight_pointer,
	465	.page = snd_pcm_lib_get_vmalloc_page,
	466	.mmap = snd_pcm_lib_mmap_vmalloc,
	467	};
	468	struct snd_pcm *pcm;
	469	int err;
	470
	471	err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
	472	if (err < 0)
	473	return err;
	474	pcm->private_data = isight;
475	strcpy(pcm->name, "iSight");
476	isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
477	isight->pcm->ops = &ops;
478
479	return 0;
480	}
481
482	static int isight_gain_info(struct snd_kcontrol *ctl,
483	struct snd_ctl_elem_info *info)
484	{
485	struct isight *isight = ctl->private_data;
486
487	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
488	info->count = 1;
489	info->value.integer.min = isight->gain_min;
490	info->value.integer.max = isight->gain_max;
491
492	return 0;
493	}
494
495	static int isight_gain_get(struct snd_kcontrol *ctl,
496	struct snd_ctl_elem_value *value)
497	{
498	struct isight *isight = ctl->private_data;
499	__be32 gain;
500	int err;
501
ac34dad2	502	err = reg_read(isight, REG_GAIN, &gain);
3a691b28 CL	503	if (err < 0)
	504	return err;
	505
	506	value->value.integer.value[0] = (s32)be32_to_cpu(gain);
	507
	508	return 0;
	509	}
	510
	511	static int isight_gain_put(struct snd_kcontrol *ctl,
	512	struct snd_ctl_elem_value *value)
	513	{
	514	struct isight *isight = ctl->private_data;
3a691b28 CL	515
	516	if (value->value.integer.value[0] < isight->gain_min \|\|
	517	value->value.integer.value[0] > isight->gain_max)
	518	return -EINVAL;
	519
ac34dad2 SR	520	return reg_write(isight, REG_GAIN,
ac34dad2 SR	521	cpu_to_be32(value->value.integer.value[0]));
3a691b28 CL	522	}
	523
	524	static int isight_mute_get(struct snd_kcontrol *ctl,
	525	struct snd_ctl_elem_value *value)
	526	{
	527	struct isight *isight = ctl->private_data;
	528	__be32 mute;
	529	int err;
	530
ac34dad2	531	err = reg_read(isight, REG_MUTE, &mute);
3a691b28 CL	532	if (err < 0)
	533	return err;
	534
	535	value->value.integer.value[0] = !mute;
	536
	537	return 0;
	538	}
	539
	540	static int isight_mute_put(struct snd_kcontrol *ctl,
	541	struct snd_ctl_elem_value *value)
	542	{
	543	struct isight *isight = ctl->private_data;
3a691b28	544
ac34dad2 SR	545	return reg_write(isight, REG_MUTE,
ac34dad2 SR	546	(__force __be32)!value->value.integer.value[0]);
3a691b28 CL	547	}
	548
	549	static int isight_create_mixer(struct isight *isight)
	550	{
	551	static const struct snd_kcontrol_new gain_control = {
	552	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	553	.name = "Mic Capture Volume",
	554	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE \|
	555	SNDRV_CTL_ELEM_ACCESS_TLV_READ,
	556	.info = isight_gain_info,
	557	.get = isight_gain_get,
	558	.put = isight_gain_put,
	559	};
	560	static const struct snd_kcontrol_new mute_control = {
	561	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	562	.name = "Mic Capture Switch",
	563	.info = snd_ctl_boolean_mono_info,
	564	.get = isight_mute_get,
	565	.put = isight_mute_put,
	566	};
	567	__be32 value;
	568	struct snd_kcontrol *ctl;
	569	int err;
	570
ac34dad2	571	err = reg_read(isight, REG_GAIN_RAW_START, &value);
3a691b28 CL	572	if (err < 0)
	573	return err;
	574	isight->gain_min = be32_to_cpu(value);
	575
ac34dad2	576	err = reg_read(isight, REG_GAIN_RAW_END, &value);
3a691b28 CL	577	if (err < 0)
	578	return err;
	579	isight->gain_max = be32_to_cpu(value);
	580
	581	isight->gain_tlv[0] = SNDRV_CTL_TLVT_DB_MINMAX;
	582	isight->gain_tlv[1] = 2 * sizeof(unsigned int);
ac34dad2 SR	583
ac34dad2 SR	584	err = reg_read(isight, REG_GAIN_DB_START, &value);
3a691b28 CL	585	if (err < 0)
	586	return err;
	587	isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100;
ac34dad2 SR	588
ac34dad2 SR	589	err = reg_read(isight, REG_GAIN_DB_END, &value);
3a691b28 CL	590	if (err < 0)
	591	return err;
	592	isight->gain_tlv[3] = (s32)be32_to_cpu(value) * 100;
	593
	594	ctl = snd_ctl_new1(&gain_control, isight);
	595	if (ctl)
	596	ctl->tlv.p = isight->gain_tlv;
	597	err = snd_ctl_add(isight->card, ctl);
	598	if (err < 0)
	599	return err;
	600
	601	err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
	602	if (err < 0)
	603	return err;
	604
	605	return 0;
	606	}
	607
	608	static void isight_card_free(struct snd_card *card)
	609	{
	610	struct isight *isight = card->private_data;
	611
	612	fw_iso_resources_destroy(&isight->resources);
	613	fw_unit_put(isight->unit);
	614	fw_device_put(isight->device);
	615	mutex_destroy(&isight->mutex);
	616	}
	617
	618	static u64 get_unit_base(struct fw_unit *unit)
	619	{
	620	struct fw_csr_iterator i;
	621	int key, value;
	622
	623	fw_csr_iterator_init(&i, unit->directory);
	624	while (fw_csr_iterator_next(&i, &key, &value))
	625	if (key == CSR_OFFSET)
	626	return CSR_REGISTER_BASE + value * 4;
	627	return 0;
	628	}
	629
	630	static int isight_probe(struct device *unit_dev)
	631	{
	632	struct fw_unit *unit = fw_unit(unit_dev);
	633	struct fw_device *fw_dev = fw_parent_device(unit);
	634	struct snd_card *card;
	635	struct isight *isight;
	636	int err;
	637
	638	err = snd_card_create(-1, NULL, THIS_MODULE, sizeof(*isight), &card);
	639	if (err < 0)
	640	return err;
	641	snd_card_set_dev(card, unit_dev);
	642
	643	isight = card->private_data;
	644	isight->card = card;
	645	mutex_init(&isight->mutex);
	646	isight->unit = fw_unit_get(unit);
	647	isight->device = fw_device_get(fw_dev);
	648	isight->audio_base = get_unit_base(unit);
	649	if (!isight->audio_base) {
	650	dev_err(&unit->device, "audio unit base not found\n");
	651	err = -ENXIO;
	652	goto err_unit;
	653	}
654	fw_iso_resources_init(&isight->resources, unit);
655
656	card->private_free = isight_card_free;
657
658	strcpy(card->driver, "iSight");
659	strcpy(card->shortname, "Apple iSight");
660	snprintf(card->longname, sizeof(card->longname),
661	"Apple iSight (GUID %08x%08x) at %s, S%d",
662	fw_dev->config_rom[3], fw_dev->config_rom[4],
663	dev_name(&unit->device), 100 << fw_dev->max_speed);
664	strcpy(card->mixername, "iSight");
665
666	err = isight_create_pcm(isight);
667	if (err < 0)
668	goto error;
669
670	err = isight_create_mixer(isight);
671	if (err < 0)
672	goto error;
673
674	err = snd_card_register(card);
675	if (err < 0)
676	goto error;
677
678	dev_set_drvdata(unit_dev, isight);
679
680	return 0;
681
682	err_unit:
683	fw_unit_put(isight->unit);
684	fw_device_put(isight->device);
685	mutex_destroy(&isight->mutex);
686	error:
687	snd_card_free(card);
688	return err;
689	}
690
691	static int isight_remove(struct device *dev)
692	{
693	struct isight *isight = dev_get_drvdata(dev);
694
3a691b28 CL	695	mutex_lock(&isight->mutex);
3a691b28 CL	696	isight_pcm_abort(isight);
aee70400	697	snd_card_disconnect(isight->card);
3a691b28 CL	698	isight_stop_streaming(isight);
	699	mutex_unlock(&isight->mutex);
	700
	701	snd_card_free_when_closed(isight->card);
	702
	703	return 0;
	704	}
	705
	706	static void isight_bus_reset(struct fw_unit *unit)
	707	{
	708	struct isight *isight = dev_get_drvdata(&unit->device);
	709
	710	mutex_lock(&isight->mutex);
	711	if (fw_iso_resources_update(&isight->resources) < 0) {
	712	isight_pcm_abort(isight);
	713	isight_stop_streaming(isight);
	714	}
	715	mutex_unlock(&isight->mutex);
	716	}
	717
	718	static const struct ieee1394_device_id isight_id_table[] = {
	719	{
	720	.match_flags = IEEE1394_MATCH_SPECIFIER_ID \|
	721	IEEE1394_MATCH_VERSION,
	722	.specifier_id = OUI_APPLE,
	723	.version = SW_ISIGHT_AUDIO,
	724	},
	725	{ }
	726	};
	727	MODULE_DEVICE_TABLE(ieee1394, isight_id_table);
	728
	729	static struct fw_driver isight_driver = {
	730	.driver = {
	731	.owner = THIS_MODULE,
	732	.name = KBUILD_MODNAME,
	733	.bus = &fw_bus_type,
	734	.probe = isight_probe,
	735	.remove = isight_remove,
	736	},
	737	.update = isight_bus_reset,
	738	.id_table = isight_id_table,
	739	};
	740
	741	static int __init alsa_isight_init(void)
	742	{
	743	return driver_register(&isight_driver.driver);
	744	}
	745
	746	static void __exit alsa_isight_exit(void)
	747	{
	748	driver_unregister(&isight_driver.driver);
	749	}
	750
	751	module_init(alsa_isight_init);
	752	module_exit(alsa_isight_exit);