--- /dev/null
+/*
+ * Apple iSight audio driver
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/firewire.h>
+#include <linux/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_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,
+};
+
+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;
+
+ 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;
+ }
+ }
+
+ if (++index >= QUEUE_LENGTH)
+ index = 0;
+
+ 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;
+ }
+
+ 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)
+{
+ return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+}
+
+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;
+
+ value = 0;
+ snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
+ isight->audio_base + REG_AUDIO_ENABLE,
+ &value, 4);
+
+ fw_iso_resources_free(&isight->resources);
+}
+
+static int isight_hw_free(struct snd_pcm_substream *substream)
+{
+ struct isight *isight = substream->private_data;
+
+ 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)
+{
+ __be32 sample_rate;
+ unsigned int i;
+ int err;
+
+ if (isight->context) {
+ if (isight->packet_index < 0)
+ isight_stop_streaming(isight);
+ else
+ return 0;
+ }
+
+ sample_rate = cpu_to_be32(RATE_48000);
+ err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
+ isight->audio_base + REG_SAMPLE_RATE,
+ &sample_rate, 4);
+ if (err < 0)
+ return err;
+
+ err = isight_connect(isight);
+ if (err < 0)
+ goto error;
+
+ 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);
+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 = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
+ isight->audio_base + REG_GAIN, &gain, 4);
+ 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;
+ __be32 gain;
+
+ if (value->value.integer.value[0] < isight->gain_min ||
+ value->value.integer.value[0] > isight->gain_max)
+ return -EINVAL;
+
+ gain = cpu_to_be32(value->value.integer.value[0]);
+ return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
+ isight->audio_base + REG_GAIN, &gain, 4);
+}
+
+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 = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
+ isight->audio_base + REG_MUTE, &mute, 4);
+ 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;
+ __be32 mute;
+
+ mute = (__force __be32)!value->value.integer.value[0];
+ return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
+ isight->audio_base + REG_MUTE, &mute, 4);
+}
+
+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 = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
+ isight->audio_base + REG_GAIN_RAW_START,
+ &value, 4);
+ if (err < 0)
+ return err;
+ isight->gain_min = be32_to_cpu(value);
+
+ err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
+ isight->audio_base + REG_GAIN_RAW_END,
+ &value, 4);
+ 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 = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
+ isight->audio_base + REG_GAIN_DB_START,
+ &value, 4);
+ if (err < 0)
+ return err;
+ isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100;
+ err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
+ isight->audio_base + REG_GAIN_DB_END,
+ &value, 4);
+ 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);
+
+ snd_card_disconnect(isight->card);
+
+ mutex_lock(&isight->mutex);
+ isight_pcm_abort(isight);
+ 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);
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