[mirror_ubuntu-artful-kernel.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 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)
{
	if (ACCESS_ONCE(isight->pcm_active))
		snd_pcm_stop_xrun(isight->pcm);
}

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;
	}
	fw_iso_context_queue_flush(isight->context);

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

static int isight_connect(struct isight *isight)
{
	int ch, err;
	__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));
	err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
				 isight->audio_base + REG_ISO_TX_CONFIG,
				 &value, 4, FW_FIXED_GENERATION |
				 isight->resources.generation);
	if (err == -EAGAIN) {
		fw_iso_resources_free(&isight->resources);
		goto retry_after_bus_reset;
	} else if (err < 0) {
		goto err_resources;
	}

	return 0;

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, 0);
}

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, 0);
}

static void isight_stop_streaming(struct isight *isight)
{
	__be32 value;

	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);
	value = 0;
	snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
			   isight->audio_base + REG_AUDIO_ENABLE,
			   &value, 4, FW_QUIET);
}

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);
	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 fw_unit *unit,
			const struct ieee1394_device_id *id)
{
	struct fw_device *fw_dev = fw_parent_device(unit);
	struct snd_card *card;
	struct isight *isight;
	int err;

	err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
			   sizeof(*isight), &card);
	if (err < 0)
		return err;

	isight = card->private_data;
	isight->card = card;
	mutex_init(&isight->mutex);
	isight->unit = fw_unit_get(unit);
	isight->device = 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->device, isight);

	return 0;

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

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

	if (fw_iso_resources_update(&isight->resources) < 0) {
		isight_pcm_abort(isight);

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

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

	isight_pcm_abort(isight);

	snd_card_disconnect(isight->card);

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

	snd_card_free_when_closed(isight->card);
}

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,
	.update   = isight_bus_reset,
	.remove   = isight_remove,
	.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;
3a691b28 CL	54	struct snd_pcm_substream *pcm;
	55	struct mutex mutex;
	56	struct iso_packets_buffer buffer;
	57	struct fw_iso_resources resources;
	58	struct fw_iso_context *context;
03c29680	59	bool pcm_active;
3a691b28 CL	60	bool pcm_running;
	61	bool first_packet;
	62	int packet_index;
	63	u32 total_samples;
	64	unsigned int buffer_pointer;
	65	unsigned int period_counter;
	66	s32 gain_min, gain_max;
	67	unsigned int gain_tlv[4];
	68	};
	69
	70	struct audio_payload {
	71	__be32 sample_count;
	72	__be32 signature;
	73	__be32 sample_total;
	74	__be32 reserved;
	75	__be16 samples[2 * MAX_FRAMES_PER_PACKET];
	76	};
	77
	78	MODULE_DESCRIPTION("iSight audio driver");
	79	MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
	80	MODULE_LICENSE("GPL v2");
	81
	82	static struct fw_iso_packet audio_packet = {
	83	.payload_length = sizeof(struct audio_payload),
	84	.interrupt = 1,
f2934cd4	85	.header_length = 4,
3a691b28 CL	86	};
	87
	88	static void isight_update_pointers(struct isight *isight, unsigned int count)
	89	{
	90	struct snd_pcm_runtime *runtime = isight->pcm->runtime;
	91	unsigned int ptr;
	92
	93	smp_wmb(); /* update buffer data before buffer pointer */
	94
	95	ptr = isight->buffer_pointer;
	96	ptr += count;
	97	if (ptr >= runtime->buffer_size)
	98	ptr -= runtime->buffer_size;
	99	ACCESS_ONCE(isight->buffer_pointer) = ptr;
	100
	101	isight->period_counter += count;
	102	if (isight->period_counter >= runtime->period_size) {
	103	isight->period_counter -= runtime->period_size;
	104	snd_pcm_period_elapsed(isight->pcm);
	105	}
	106	}
	107
	108	static void isight_samples(struct isight *isight,
	109	const __be16 *samples, unsigned int count)
	110	{
	111	struct snd_pcm_runtime *runtime;
	112	unsigned int count1;
	113
	114	if (!ACCESS_ONCE(isight->pcm_running))
	115	return;
	116
	117	runtime = isight->pcm->runtime;
	118	if (isight->buffer_pointer + count <= runtime->buffer_size) {
	119	memcpy(runtime->dma_area + isight->buffer_pointer * 4,
	120	samples, count * 4);
	121	} else {
	122	count1 = runtime->buffer_size - isight->buffer_pointer;
	123	memcpy(runtime->dma_area + isight->buffer_pointer * 4,
	124	samples, count1 * 4);
	125	samples += count1 * 2;
	126	memcpy(runtime->dma_area, samples, (count - count1) * 4);
	127	}
	128
	129	isight_update_pointers(isight, count);
	130	}
	131
	132	static void isight_pcm_abort(struct isight *isight)
	133	{
1fb8510c TI	134	if (ACCESS_ONCE(isight->pcm_active))
1fb8510c TI	135	snd_pcm_stop_xrun(isight->pcm);
3a691b28 CL	136	}
	137
	138	static void isight_dropped_samples(struct isight *isight, unsigned int total)
	139	{
	140	struct snd_pcm_runtime *runtime;
	141	u32 dropped;
	142	unsigned int count1;
	143
	144	if (!ACCESS_ONCE(isight->pcm_running))
	145	return;
	146
	147	runtime = isight->pcm->runtime;
	148	dropped = total - isight->total_samples;
	149	if (dropped < runtime->buffer_size) {
	150	if (isight->buffer_pointer + dropped <= runtime->buffer_size) {
	151	memset(runtime->dma_area + isight->buffer_pointer * 4,
	152	0, dropped * 4);
	153	} else {
	154	count1 = runtime->buffer_size - isight->buffer_pointer;
	155	memset(runtime->dma_area + isight->buffer_pointer * 4,
	156	0, count1 * 4);
	157	memset(runtime->dma_area, 0, (dropped - count1) * 4);
	158	}
	159	isight_update_pointers(isight, dropped);
	160	} else {
	161	isight_pcm_abort(isight);
	162	}
	163	}
	164
	165	static void isight_packet(struct fw_iso_context *context, u32 cycle,
	166	size_t header_length, void header, void data)
	167	{
	168	struct isight *isight = data;
	169	const struct audio_payload *payload;
	170	unsigned int index, length, count, total;
	171	int err;
	172
	173	if (isight->packet_index < 0)
	174	return;
	175	index = isight->packet_index;
	176	payload = isight->buffer.packets[index].buffer;
	177	length = be32_to_cpup(header) >> 16;
	178
	179	if (likely(length >= 16 &&
	180	payload->signature == cpu_to_be32(0x73676874/"sght"/))) {
	181	count = be32_to_cpu(payload->sample_count);
	182	if (likely(count <= (length - 16) / 4)) {
	183	total = be32_to_cpu(payload->sample_total);
	184	if (unlikely(total != isight->total_samples)) {
	185	if (!isight->first_packet)
	186	isight_dropped_samples(isight, total);
	187	isight->first_packet = false;
	188	isight->total_samples = total;
	189	}
	190
	191	isight_samples(isight, payload->samples, count);
	192	isight->total_samples += count;
	193	}
	194	}
	195
3a691b28 CL	196	err = fw_iso_context_queue(isight->context, &audio_packet,
	197	&isight->buffer.iso_buffer,
	198	isight->buffer.packets[index].offset);
	199	if (err < 0) {
	200	dev_err(&isight->unit->device, "queueing error: %d\n", err);
	201	isight_pcm_abort(isight);
	202	isight->packet_index = -1;
	203	return;
	204	}
cf6f1ff1	205	fw_iso_context_queue_flush(isight->context);
3a691b28	206
898732d1 CL	207	if (++index >= QUEUE_LENGTH)
898732d1 CL	208	index = 0;
3a691b28 CL	209	isight->packet_index = index;
	210	}
	211
	212	static int isight_connect(struct isight *isight)
	213	{
1b70485f	214	int ch, err;
3a691b28 CL	215	__be32 value;
	216
	217	retry_after_bus_reset:
	218	ch = fw_iso_resources_allocate(&isight->resources,
	219	sizeof(struct audio_payload),
	220	isight->device->max_speed);
	221	if (ch < 0) {
	222	err = ch;
	223	goto error;
	224	}
	225
	226	value = cpu_to_be32(ch \| (isight->device->max_speed << SPEED_SHIFT));
1b70485f CL	227	err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
	228	isight->audio_base + REG_ISO_TX_CONFIG,
	229	&value, 4, FW_FIXED_GENERATION \|
	230	isight->resources.generation);
	231	if (err == -EAGAIN) {
	232	fw_iso_resources_free(&isight->resources);
	233	goto retry_after_bus_reset;
	234	} else if (err < 0) {
	235	goto err_resources;
3a691b28 CL	236	}
3a691b28 CL	237
1b70485f CL	238	return 0;
1b70485f CL	239
3a691b28 CL	240	err_resources:
	241	fw_iso_resources_free(&isight->resources);
	242	error:
	243	return err;
	244	}
	245
	246	static int isight_open(struct snd_pcm_substream *substream)
	247	{
	248	static const struct snd_pcm_hardware hardware = {
	249	.info = SNDRV_PCM_INFO_MMAP \|
	250	SNDRV_PCM_INFO_MMAP_VALID \|
	251	SNDRV_PCM_INFO_BATCH \|
	252	SNDRV_PCM_INFO_INTERLEAVED \|
	253	SNDRV_PCM_INFO_BLOCK_TRANSFER,
	254	.formats = SNDRV_PCM_FMTBIT_S16_BE,
	255	.rates = SNDRV_PCM_RATE_48000,
	256	.rate_min = 48000,
	257	.rate_max = 48000,
	258	.channels_min = 2,
	259	.channels_max = 2,
	260	.buffer_bytes_max = 4 * 1024 * 1024,
	261	.period_bytes_min = MAX_FRAMES_PER_PACKET * 4,
	262	.period_bytes_max = 1024 * 1024,
	263	.periods_min = 2,
	264	.periods_max = UINT_MAX,
	265	};
	266	struct isight *isight = substream->private_data;
	267
	268	substream->runtime->hw = hardware;
	269
	270	return iso_packets_buffer_init(&isight->buffer, isight->unit,
	271	QUEUE_LENGTH,
	272	sizeof(struct audio_payload),
	273	DMA_FROM_DEVICE);
	274	}
	275
	276	static int isight_close(struct snd_pcm_substream *substream)
	277	{
	278	struct isight *isight = substream->private_data;
	279
	280	iso_packets_buffer_destroy(&isight->buffer, isight->unit);
	281
	282	return 0;
	283	}
	284
	285	static int isight_hw_params(struct snd_pcm_substream *substream,
	286	struct snd_pcm_hw_params *hw_params)
	287	{
03c29680 CL	288	struct isight *isight = substream->private_data;
	289	int err;
	290
	291	err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
	292	params_buffer_bytes(hw_params));
	293	if (err < 0)
	294	return err;
	295
	296	ACCESS_ONCE(isight->pcm_active) = true;
	297
	298	return 0;
3a691b28 CL	299	}
3a691b28 CL	300
ac34dad2	301	static int reg_read(struct isight isight, int offset, __be32 value)
3a691b28	302	{
ac34dad2	303	return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
1b70485f	304	isight->audio_base + offset, value, 4, 0);
ac34dad2 SR	305	}
	306
	307	static int reg_write(struct isight *isight, int offset, __be32 value)
	308	{
	309	return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
1b70485f	310	isight->audio_base + offset, &value, 4, 0);
ac34dad2	311	}
3a691b28	312
ac34dad2 SR	313	static void isight_stop_streaming(struct isight *isight)
ac34dad2 SR	314	{
1b70485f CL	315	__be32 value;
1b70485f CL	316
3a691b28 CL	317	if (!isight->context)
	318	return;
	319
	320	fw_iso_context_stop(isight->context);
	321	fw_iso_context_destroy(isight->context);
	322	isight->context = NULL;
3a691b28	323	fw_iso_resources_free(&isight->resources);
1b70485f CL	324	value = 0;
	325	snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
	326	isight->audio_base + REG_AUDIO_ENABLE,
	327	&value, 4, FW_QUIET);
3a691b28 CL	328	}
	329
	330	static int isight_hw_free(struct snd_pcm_substream *substream)
	331	{
	332	struct isight *isight = substream->private_data;
	333
03c29680 CL	334	ACCESS_ONCE(isight->pcm_active) = false;
03c29680 CL	335
3a691b28 CL	336	mutex_lock(&isight->mutex);
	337	isight_stop_streaming(isight);
	338	mutex_unlock(&isight->mutex);
	339
	340	return snd_pcm_lib_free_vmalloc_buffer(substream);
	341	}
	342
	343	static int isight_start_streaming(struct isight *isight)
	344	{
3a691b28 CL	345	unsigned int i;
	346	int err;
	347
	348	if (isight->context) {
	349	if (isight->packet_index < 0)
	350	isight_stop_streaming(isight);
	351	else
	352	return 0;
	353	}
	354
ac34dad2	355	err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000));
3a691b28	356	if (err < 0)
ac34dad2	357	goto error;
3a691b28 CL	358
	359	err = isight_connect(isight);
	360	if (err < 0)
	361	goto error;
	362
ac34dad2	363	err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE));
8839eeda SR	364	if (err < 0)
	365	goto err_resources;
	366
3a691b28 CL	367	isight->context = fw_iso_context_create(isight->device->card,
	368	FW_ISO_CONTEXT_RECEIVE,
	369	isight->resources.channel,
	370	isight->device->max_speed,
	371	4, isight_packet, isight);
	372	if (IS_ERR(isight->context)) {
	373	err = PTR_ERR(isight->context);
	374	isight->context = NULL;
	375	goto err_resources;
	376	}
	377
	378	for (i = 0; i < QUEUE_LENGTH; ++i) {
	379	err = fw_iso_context_queue(isight->context, &audio_packet,
	380	&isight->buffer.iso_buffer,
	381	isight->buffer.packets[i].offset);
	382	if (err < 0)
	383	goto err_context;
	384	}
	385
	386	isight->first_packet = true;
	387	isight->packet_index = 0;
	388
	389	err = fw_iso_context_start(isight->context, -1, 0,
	390	FW_ISO_CONTEXT_MATCH_ALL_TAGS/?/);
	391	if (err < 0)
	392	goto err_context;
	393
	394	return 0;
	395
	396	err_context:
	397	fw_iso_context_destroy(isight->context);
	398	isight->context = NULL;
	399	err_resources:
	400	fw_iso_resources_free(&isight->resources);
ac34dad2	401	reg_write(isight, REG_AUDIO_ENABLE, 0);
3a691b28 CL	402	error:
	403	return err;
	404	}
	405
	406	static int isight_prepare(struct snd_pcm_substream *substream)
	407	{
	408	struct isight *isight = substream->private_data;
	409	int err;
	410
	411	isight->buffer_pointer = 0;
	412	isight->period_counter = 0;
	413
	414	mutex_lock(&isight->mutex);
	415	err = isight_start_streaming(isight);
	416	mutex_unlock(&isight->mutex);
	417
	418	return err;
	419	}
	420
	421	static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
	422	{
	423	struct isight *isight = substream->private_data;
	424
	425	switch (cmd) {
	426	case SNDRV_PCM_TRIGGER_START:
	427	ACCESS_ONCE(isight->pcm_running) = true;
	428	break;
	429	case SNDRV_PCM_TRIGGER_STOP:
	430	ACCESS_ONCE(isight->pcm_running) = false;
	431	break;
	432	default:
	433	return -EINVAL;
	434	}
	435	return 0;
	436	}
	437
	438	static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
	439	{
	440	struct isight *isight = substream->private_data;
	441
	442	return ACCESS_ONCE(isight->buffer_pointer);
	443	}
	444
	445	static int isight_create_pcm(struct isight *isight)
	446	{
	447	static struct snd_pcm_ops ops = {
	448	.open = isight_open,
	449	.close = isight_close,
	450	.ioctl = snd_pcm_lib_ioctl,
	451	.hw_params = isight_hw_params,
	452	.hw_free = isight_hw_free,
	453	.prepare = isight_prepare,
	454	.trigger = isight_trigger,
	455	.pointer = isight_pointer,
	456	.page = snd_pcm_lib_get_vmalloc_page,
	457	.mmap = snd_pcm_lib_mmap_vmalloc,
	458	};
	459	struct snd_pcm *pcm;
	460	int err;
	461
	462	err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
	463	if (err < 0)
	464	return err;
	465	pcm->private_data = isight;
466	strcpy(pcm->name, "iSight");
467	isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
468	isight->pcm->ops = &ops;
469
470	return 0;
471	}
472
473	static int isight_gain_info(struct snd_kcontrol *ctl,
474	struct snd_ctl_elem_info *info)
475	{
476	struct isight *isight = ctl->private_data;
477
478	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
479	info->count = 1;
480	info->value.integer.min = isight->gain_min;
481	info->value.integer.max = isight->gain_max;
482
483	return 0;
484	}
485
486	static int isight_gain_get(struct snd_kcontrol *ctl,
487	struct snd_ctl_elem_value *value)
488	{
489	struct isight *isight = ctl->private_data;
490	__be32 gain;
491	int err;
492
ac34dad2	493	err = reg_read(isight, REG_GAIN, &gain);
3a691b28 CL	494	if (err < 0)
	495	return err;
	496
	497	value->value.integer.value[0] = (s32)be32_to_cpu(gain);
	498
	499	return 0;
	500	}
	501
	502	static int isight_gain_put(struct snd_kcontrol *ctl,
	503	struct snd_ctl_elem_value *value)
	504	{
	505	struct isight *isight = ctl->private_data;
3a691b28 CL	506
	507	if (value->value.integer.value[0] < isight->gain_min \|\|
	508	value->value.integer.value[0] > isight->gain_max)
	509	return -EINVAL;
	510
ac34dad2 SR	511	return reg_write(isight, REG_GAIN,
ac34dad2 SR	512	cpu_to_be32(value->value.integer.value[0]));
3a691b28 CL	513	}
	514
	515	static int isight_mute_get(struct snd_kcontrol *ctl,
	516	struct snd_ctl_elem_value *value)
	517	{
	518	struct isight *isight = ctl->private_data;
	519	__be32 mute;
	520	int err;
	521
ac34dad2	522	err = reg_read(isight, REG_MUTE, &mute);
3a691b28 CL	523	if (err < 0)
	524	return err;
	525
	526	value->value.integer.value[0] = !mute;
	527
	528	return 0;
	529	}
	530
	531	static int isight_mute_put(struct snd_kcontrol *ctl,
	532	struct snd_ctl_elem_value *value)
	533	{
	534	struct isight *isight = ctl->private_data;
3a691b28	535
ac34dad2 SR	536	return reg_write(isight, REG_MUTE,
ac34dad2 SR	537	(__force __be32)!value->value.integer.value[0]);
3a691b28 CL	538	}
	539
	540	static int isight_create_mixer(struct isight *isight)
	541	{
	542	static const struct snd_kcontrol_new gain_control = {
	543	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	544	.name = "Mic Capture Volume",
	545	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE \|
	546	SNDRV_CTL_ELEM_ACCESS_TLV_READ,
	547	.info = isight_gain_info,
	548	.get = isight_gain_get,
	549	.put = isight_gain_put,
	550	};
	551	static const struct snd_kcontrol_new mute_control = {
	552	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	553	.name = "Mic Capture Switch",
	554	.info = snd_ctl_boolean_mono_info,
	555	.get = isight_mute_get,
	556	.put = isight_mute_put,
	557	};
	558	__be32 value;
	559	struct snd_kcontrol *ctl;
	560	int err;
	561
ac34dad2	562	err = reg_read(isight, REG_GAIN_RAW_START, &value);
3a691b28 CL	563	if (err < 0)
	564	return err;
	565	isight->gain_min = be32_to_cpu(value);
	566
ac34dad2	567	err = reg_read(isight, REG_GAIN_RAW_END, &value);
3a691b28 CL	568	if (err < 0)
	569	return err;
	570	isight->gain_max = be32_to_cpu(value);
	571
	572	isight->gain_tlv[0] = SNDRV_CTL_TLVT_DB_MINMAX;
	573	isight->gain_tlv[1] = 2 * sizeof(unsigned int);
ac34dad2 SR	574
ac34dad2 SR	575	err = reg_read(isight, REG_GAIN_DB_START, &value);
3a691b28 CL	576	if (err < 0)
	577	return err;
	578	isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100;
ac34dad2 SR	579
ac34dad2 SR	580	err = reg_read(isight, REG_GAIN_DB_END, &value);
3a691b28 CL	581	if (err < 0)
	582	return err;
	583	isight->gain_tlv[3] = (s32)be32_to_cpu(value) * 100;
	584
	585	ctl = snd_ctl_new1(&gain_control, isight);
	586	if (ctl)
	587	ctl->tlv.p = isight->gain_tlv;
	588	err = snd_ctl_add(isight->card, ctl);
	589	if (err < 0)
	590	return err;
	591
	592	err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
	593	if (err < 0)
	594	return err;
	595
	596	return 0;
	597	}
	598
	599	static void isight_card_free(struct snd_card *card)
	600	{
	601	struct isight *isight = card->private_data;
	602
	603	fw_iso_resources_destroy(&isight->resources);
	604	fw_unit_put(isight->unit);
3a691b28 CL	605	mutex_destroy(&isight->mutex);
	606	}
	607
	608	static u64 get_unit_base(struct fw_unit *unit)
	609	{
	610	struct fw_csr_iterator i;
	611	int key, value;
	612
	613	fw_csr_iterator_init(&i, unit->directory);
	614	while (fw_csr_iterator_next(&i, &key, &value))
	615	if (key == CSR_OFFSET)
	616	return CSR_REGISTER_BASE + value * 4;
	617	return 0;
	618	}
	619
94a87157 SR	620	static int isight_probe(struct fw_unit *unit,
94a87157 SR	621	const struct ieee1394_device_id *id)
3a691b28	622	{
3a691b28 CL	623	struct fw_device *fw_dev = fw_parent_device(unit);
	624	struct snd_card *card;
	625	struct isight *isight;
	626	int err;
	627
06b45f00 TI	628	err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
06b45f00 TI	629	sizeof(*isight), &card);
3a691b28 CL	630	if (err < 0)
3a691b28 CL	631	return err;
3a691b28 CL	632
	633	isight = card->private_data;
	634	isight->card = card;
	635	mutex_init(&isight->mutex);
	636	isight->unit = fw_unit_get(unit);
21076226	637	isight->device = fw_dev;
3a691b28 CL	638	isight->audio_base = get_unit_base(unit);
	639	if (!isight->audio_base) {
	640	dev_err(&unit->device, "audio unit base not found\n");
	641	err = -ENXIO;
	642	goto err_unit;
	643	}
	644	fw_iso_resources_init(&isight->resources, unit);
	645
	646	card->private_free = isight_card_free;
	647
	648	strcpy(card->driver, "iSight");
	649	strcpy(card->shortname, "Apple iSight");
	650	snprintf(card->longname, sizeof(card->longname),
	651	"Apple iSight (GUID %08x%08x) at %s, S%d",
	652	fw_dev->config_rom[3], fw_dev->config_rom[4],
	653	dev_name(&unit->device), 100 << fw_dev->max_speed);
	654	strcpy(card->mixername, "iSight");
	655
	656	err = isight_create_pcm(isight);
	657	if (err < 0)
	658	goto error;
	659
	660	err = isight_create_mixer(isight);
	661	if (err < 0)
	662	goto error;
	663
	664	err = snd_card_register(card);
	665	if (err < 0)
	666	goto error;
	667
94a87157	668	dev_set_drvdata(&unit->device, isight);
3a691b28 CL	669
	670	return 0;
	671
	672	err_unit:
	673	fw_unit_put(isight->unit);
3a691b28 CL	674	mutex_destroy(&isight->mutex);
	675	error:
	676	snd_card_free(card);
	677	return err;
	678	}
	679
3a691b28 CL	680	static void isight_bus_reset(struct fw_unit *unit)
	681	{
	682	struct isight *isight = dev_get_drvdata(&unit->device);
	683
3a691b28 CL	684	if (fw_iso_resources_update(&isight->resources) < 0) {
3a691b28 CL	685	isight_pcm_abort(isight);
f3f7c183 CL	686
f3f7c183 CL	687	mutex_lock(&isight->mutex);
3a691b28	688	isight_stop_streaming(isight);
f3f7c183	689	mutex_unlock(&isight->mutex);
3a691b28	690	}
3a691b28 CL	691	}
3a691b28 CL	692
94a87157 SR	693	static void isight_remove(struct fw_unit *unit)
	694	{
	695	struct isight *isight = dev_get_drvdata(&unit->device);
	696
	697	isight_pcm_abort(isight);
	698
	699	snd_card_disconnect(isight->card);
	700
	701	mutex_lock(&isight->mutex);
	702	isight_stop_streaming(isight);
	703	mutex_unlock(&isight->mutex);
	704
	705	snd_card_free_when_closed(isight->card);
	706	}
	707
3a691b28 CL	708	static const struct ieee1394_device_id isight_id_table[] = {
	709	{
	710	.match_flags = IEEE1394_MATCH_SPECIFIER_ID \|
	711	IEEE1394_MATCH_VERSION,
	712	.specifier_id = OUI_APPLE,
	713	.version = SW_ISIGHT_AUDIO,
	714	},
	715	{ }
	716	};
	717	MODULE_DEVICE_TABLE(ieee1394, isight_id_table);
	718
	719	static struct fw_driver isight_driver = {
	720	.driver = {
	721	.owner = THIS_MODULE,
	722	.name = KBUILD_MODNAME,
	723	.bus = &fw_bus_type,
3a691b28	724	},
94a87157	725	.probe = isight_probe,
3a691b28	726	.update = isight_bus_reset,
94a87157	727	.remove = isight_remove,
3a691b28 CL	728	.id_table = isight_id_table,
	729	};
	730
	731	static int __init alsa_isight_init(void)
	732	{
	733	return driver_register(&isight_driver.driver);
	734	}
	735
	736	static void __exit alsa_isight_exit(void)
	737	{
	738	driver_unregister(&isight_driver.driver);
	739	}
	740
	741	module_init(alsa_isight_init);
	742	module_exit(alsa_isight_exit);