[ALSA] Add ALSA support for the SEGA Dreamcast PCM device (198de43d) · Commits · EulixOS / Software / Kernel

sound/Kconfig

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Original line number	Diff line number	Diff line
		@@ -65,6 +65,8 @@ source "sound/arm/Kconfig"

		source "sound/mips/Kconfig"

		source "sound/sh/Kconfig"

		# the following will depend on the order of config.
		# here assuming USB is defined before ALSA
		source "sound/usb/Kconfig"

sound/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -5,7 +5,7 @@ obj-$(CONFIG_SOUND) += soundcore.o
		obj-$(CONFIG_SOUND_PRIME) += sound_firmware.o
		obj-$(CONFIG_SOUND_PRIME) += oss/
		obj-$(CONFIG_DMASOUND) += oss/
		obj-$(CONFIG_SND) += core/ i2c/ drivers/ isa/ pci/ ppc/ arm/ synth/ usb/ sparc/ parisc/ pcmcia/ mips/ soc/
		obj-$(CONFIG_SND) += core/ i2c/ drivers/ isa/ pci/ ppc/ arm/ sh/ synth/ usb/ sparc/ parisc/ pcmcia/ mips/ soc/
		obj-$(CONFIG_SND_AOA) += aoa/

		# This one must be compilable even if sound is configured out

sound/sh/Kconfig

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+14 −0

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		# ALSA SH drivers

		menu "SUPERH devices"
		depends on SND!=n && SUPERH

		config SND_AICA
		tristate "Dreamcast Yamaha AICA sound"
		depends on SH_DREAMCAST && SND
		select SND_PCM
		help
		ALSA Sound driver for the SEGA Dreamcast console.

		endmenu

sound/sh/Makefile

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		#
		# Makefile for ALSA
		#

		snd-aica-objs := aica.o

		# Toplevel Module Dependency
		obj-$(CONFIG_SND_AICA) += snd-aica.o

sound/sh/aica.c

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+675 −0

Original line number	Diff line number	Diff line
		/*
		* This code is licenced under
		* the General Public Licence
		* version 2
		*
		* Copyright Adrian McMenamin 2005, 2006, 2007
		* <adrian@mcmen.demon.co.uk>
		* Requires firmware (BSD licenced) available from:
		* http://linuxdc.cvs.sourceforge.net/linuxdc/linux-sh-dc/sound/oss/aica/firmware/
		* or the maintainer
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of version 2 of the GNU General Public License as published by
		* the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*
		*/

		#include <linux/init.h>
		#include <linux/jiffies.h>
		#include <linux/slab.h>
		#include <linux/time.h>
		#include <linux/wait.h>
		#include <linux/moduleparam.h>
		#include <linux/platform_device.h>
		#include <linux/firmware.h>
		#include <linux/timer.h>
		#include <linux/delay.h>
		#include <linux/workqueue.h>
		#include <sound/driver.h>
		#include <sound/core.h>
		#include <sound/control.h>
		#include <sound/pcm.h>
		#include <sound/initval.h>
		#include <sound/info.h>
		#include <asm/io.h>
		#include <asm/dma.h>
		#include <asm/dreamcast/sysasic.h>
		#include "aica.h"

		MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
		MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
		MODULE_LICENSE("GPL");
		MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}");

		/* module parameters */
		#define CARD_NAME "AICA"
		static int index = -1;
		static char *id;
		static int enable = 1;
		module_param(index, int, 0444);
		MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
		module_param(id, charp, 0444);
		MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
		module_param(enable, bool, 0644);
		MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");

		/* Use workqueue */

		static struct spu_work_holder {
		struct work_struct spu_dma_work;
		void *sspointer;
		} spu_working;

		static struct workqueue_struct *aica_queue;

		/* Simple platform device */
		static struct platform_device *pd;
		static struct resource aica_memory_space[2] = {
		{
		.name = "AICA ARM CONTROL",
		.start = ARM_RESET_REGISTER,
		.flags = IORESOURCE_MEM,
		.end = ARM_RESET_REGISTER + 3,
		},
		{
		.name = "AICA Sound RAM",
		.start = SPU_MEMORY_BASE,
		.flags = IORESOURCE_MEM,
		.end = SPU_MEMORY_BASE + 0x200000 - 1,
		},
		};

		/* SPU specific functions */
		/* spu_write_wait - wait for G2-SH FIFO to clear */
		static void spu_write_wait(void)
		{
		int time_count;
		time_count = 0;
		while (1) {
		if (!(readl(G2_FIFO) & 0x11))
		break;
		/* To ensure hardware failure doesn't wedge kernel */
		time_count++;
		if (time_count > 0x10000)
		{
		snd_printk("WARNING: G2 FIFO appears to be blocked.\n");
		break;
		}
		}
		}

		/* spu_memset - write to memory in SPU address space */
		static void spu_memset(u32 toi, u32 what, int length)
		{
		int i;
		snd_assert(length % 4 == 0, return);
		for (i = 0; i < length; i++) {
		if (!(i % 8))
		spu_write_wait();
		writel(what, toi + SPU_MEMORY_BASE);
		toi++;
		}
		}

		/* spu_memload - write to SPU address space */
		static void spu_memload(u32 toi, void *from, int length)
		{
		u32 *froml = from;
		u32 __iomem to = (u32 __iomem ) (SPU_MEMORY_BASE + toi);
		int i;
		u32 val;
		length = DIV_ROUND_UP(length, 4);
		spu_write_wait();
		for (i = 0; i < length; i++) {
		if (!(i % 8))
		spu_write_wait();
		val = *froml;
		writel(val, to);
		froml++;
		to++;
		}
		}

		/* spu_disable - set spu registers to stop sound output */
		static void spu_disable(void)
		{
		int i;
		u32 regval;
		spu_write_wait();
		regval = readl(ARM_RESET_REGISTER);
		regval \|= 1;
		spu_write_wait();
		writel(regval, ARM_RESET_REGISTER);
		for (i = 0; i < 64; i++) {
		spu_write_wait();
		regval = readl(SPU_REGISTER_BASE + (i * 0x80));
		regval = (regval & ~0x4000) \| 0x8000;
		spu_write_wait();
		writel(regval, SPU_REGISTER_BASE + (i * 0x80));
		}
		}

		/* spu_enable - set spu registers to enable sound output */
		static void spu_enable(void)
		{
		u32 regval = readl(ARM_RESET_REGISTER);
		regval &= ~1;
		spu_write_wait();
		writel(regval, ARM_RESET_REGISTER);
		}

		/*
		* Halt the sound processor, clear the memory,
		* load some default ARM7 code, and then restart ARM7
		*/
		static void spu_reset(void)
		{
		spu_disable();
		spu_memset(0, 0, 0x200000 / 4);
		/* Put ARM7 in endless loop */
		ctrl_outl(0xea000002, SPU_MEMORY_BASE);
		spu_enable();
		}

		/* aica_chn_start - write to spu to start playback */
		static void aica_chn_start(void)
		{
		spu_write_wait();
		writel(AICA_CMD_KICK \| AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
		}

		/* aica_chn_halt - write to spu to halt playback */
		static void aica_chn_halt(void)
		{
		spu_write_wait();
		writel(AICA_CMD_KICK \| AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
		}

		/* ALSA code below */
		static struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
		.info = (SNDRV_PCM_INFO_NONINTERLEAVED),
		.formats =
		(SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_S16_LE \|
		SNDRV_PCM_FMTBIT_IMA_ADPCM),
		.rates = SNDRV_PCM_RATE_8000_48000,
		.rate_min = 8000,
		.rate_max = 48000,
		.channels_min = 1,
		.channels_max = 2,
		.buffer_bytes_max = AICA_BUFFER_SIZE,
		.period_bytes_min = AICA_PERIOD_SIZE,
		.period_bytes_max = AICA_PERIOD_SIZE,
		.periods_min = AICA_PERIOD_NUMBER,
		.periods_max = AICA_PERIOD_NUMBER,
		};

		static int aica_dma_transfer(int channels, int buffer_size,
		struct snd_pcm_substream *substream)
		{
		int q, err, period_offset;
		struct snd_card_aica *dreamcastcard;
		struct snd_pcm_runtime *runtime;
		err = 0;
		dreamcastcard = substream->pcm->private_data;
		period_offset = dreamcastcard->clicks;
		period_offset %= (AICA_PERIOD_NUMBER / channels);
		runtime = substream->runtime;
		for (q = 0; q < channels; q++) {
		err = dma_xfer(AICA_DMA_CHANNEL,
		(unsigned long)(runtime->dma_area +
		(AICA_BUFFER_SIZE * q) /
		channels +
		AICA_PERIOD_SIZE *
		period_offset),
		AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
		AICA_PERIOD_SIZE * period_offset,
		buffer_size / channels, AICA_DMA_MODE);
		if (unlikely(err < 0))
		break;
		dma_wait_for_completion(AICA_DMA_CHANNEL);
		}
		return err;
		}

		static void startup_aica(struct snd_card_aica *dreamcastcard)
		{
		spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
		dreamcastcard->channel,
		sizeof(struct aica_channel));
		aica_chn_start();
		}

		static void run_spu_dma(struct work_struct *work)
		{
		int buffer_size;
		struct snd_pcm_substream *substream;
		struct snd_pcm_runtime *runtime;
		struct snd_card_aica *dreamcastcard;
		struct spu_work_holder *holder = container_of(work, struct spu_work_holder, spu_dma_work);
		substream = holder-> sspointer;
		dreamcastcard = substream->pcm->private_data;
		runtime = substream->runtime;
		if (unlikely(dreamcastcard->dma_check == 0)) {
		buffer_size = frames_to_bytes(runtime, runtime->buffer_size);
		if (runtime->channels > 1)
		dreamcastcard->channel->flags \|= 0x01;
		aica_dma_transfer(runtime->channels, buffer_size, substream);
		startup_aica(dreamcastcard);
		dreamcastcard->clicks =
		buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
		return;
		} else {
		aica_dma_transfer(runtime->channels,
		AICA_PERIOD_SIZE * runtime->channels,
		substream);
		snd_pcm_period_elapsed(dreamcastcard->substream);
		dreamcastcard->clicks++;
		if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
		{
		dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
		}
		mod_timer(&dreamcastcard->timer, jiffies + 1);
		}
		}

		static void aica_period_elapsed(unsigned long timer_var)
		{
		/timer function - so cannot sleep /
		int play_period;
		struct snd_pcm_runtime *runtime;
		struct snd_pcm_substream *substream;
		struct snd_card_aica *dreamcastcard;
		substream = (struct snd_pcm_substream *)timer_var;
		runtime = substream->runtime;
		dreamcastcard = substream->pcm->private_data;
		/* Have we played out an additional period? */
		play_period =
		frames_to_bytes(runtime,
		readl
		(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
		AICA_PERIOD_SIZE;
		if (play_period == dreamcastcard->current_period) {
		/* reschedule the timer */
		mod_timer(&(dreamcastcard->timer), jiffies + 1);
		return;
		}
		if (runtime->channels > 1)
		dreamcastcard->current_period = play_period;
		if (unlikely(dreamcastcard->dma_check == 0))
		dreamcastcard->dma_check = 1;
		queue_work(aica_queue, &(spu_working.spu_dma_work));
		}

		static void spu_begin_dma(struct snd_pcm_substream *substream)
		{
		/* Must be atomic */
		struct snd_card_aica *dreamcastcard;
		struct snd_pcm_runtime *runtime;
		runtime = substream->runtime;
		dreamcastcard = substream->pcm->private_data;
		/* Use queue to do the heavy lifting */
		spu_working.sspointer = substream;
		INIT_WORK(&(spu_working.spu_dma_work), run_spu_dma);
		queue_work(aica_queue, &(spu_working.spu_dma_work));
		/* Timer may already be running */
		if (unlikely(dreamcastcard->timer.data)) {
		mod_timer(&dreamcastcard->timer, jiffies + 4);
		return;
		}
		init_timer(&(dreamcastcard->timer));
		dreamcastcard->timer.data = (unsigned long)substream;
		dreamcastcard->timer.function = aica_period_elapsed;
		dreamcastcard->timer.expires = jiffies + 4;
		add_timer(&(dreamcastcard->timer));
		}

		static int snd_aicapcm_pcm_open(struct snd_pcm_substream
		*substream)
		{
		struct snd_pcm_runtime *runtime;
		struct aica_channel *channel;
		struct snd_card_aica *dreamcastcard;
		if (!enable)
		return -ENOENT;
		dreamcastcard = substream->pcm->private_data;
		channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
		if (!channel)
		return -ENOMEM;
		/* set defaults for channel */
		channel->sfmt = SM_8BIT;
		channel->cmd = AICA_CMD_START;
		channel->vol = dreamcastcard->master_volume;
		channel->pan = 0x80;
		channel->pos = 0;
		channel->flags = 0; /* default to mono */
		dreamcastcard->channel = channel;
		runtime = substream->runtime;
		runtime->hw = snd_pcm_aica_playback_hw;
		spu_enable();
		dreamcastcard->clicks = 0;
		dreamcastcard->current_period = 0;
		dreamcastcard->dma_check = 0;
		return 0;
		}

		static int snd_aicapcm_pcm_close(struct snd_pcm_substream
		*substream)
		{
		struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
		del_timer(&dreamcastcard->timer);
		kfree(dreamcastcard->channel);
		spu_disable();
		return 0;
		}

		static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream
		*substream)
		{
		/* Free the DMA buffer */
		return snd_pcm_lib_free_pages(substream);
		}

		static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream
		*substream, struct snd_pcm_hw_params
		*hw_params)
		{
		/* Allocate a DMA buffer using ALSA built-ins */
		return
		snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
		}

		static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
		*substream)
		{
		struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
		if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
		dreamcastcard->channel->sfmt = SM_16BIT;
		dreamcastcard->channel->freq = substream->runtime->rate;
		dreamcastcard->substream = substream;
		return 0;
		}

		static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
		*substream, int cmd)
		{
		struct snd_card_aica *dreamcastcard;
		switch (cmd) {
		case SNDRV_PCM_TRIGGER_START:
		spu_begin_dma(substream);
		break;
		case SNDRV_PCM_TRIGGER_STOP:
		dreamcastcard = substream->pcm->private_data;
		if (dreamcastcard->timer.data)
		del_timer(&dreamcastcard->timer);
		aica_chn_halt();
		break;
		default:
		return -EINVAL;
		}
		return 0;
		}

		static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
		*substream)
		{
		return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
		}

		static struct snd_pcm_ops snd_aicapcm_playback_ops = {
		.open = snd_aicapcm_pcm_open,
		.close = snd_aicapcm_pcm_close,
		.ioctl = snd_pcm_lib_ioctl,
		.hw_params = snd_aicapcm_pcm_hw_params,
		.hw_free = snd_aicapcm_pcm_hw_free,
		.prepare = snd_aicapcm_pcm_prepare,
		.trigger = snd_aicapcm_pcm_trigger,
		.pointer = snd_aicapcm_pcm_pointer,
		};

		/* TO DO: set up to handle more than one pcm instance */
		static int __init snd_aicapcmchip(struct snd_card_aica
		*dreamcastcard, int pcm_index)
		{
		struct snd_pcm *pcm;
		int err;
		/* AICA has no capture ability */
		err =
		snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0, &pcm);
		if (unlikely(err < 0))
		return err;
		pcm->private_data = dreamcastcard;
		strcpy(pcm->name, "AICA PCM");
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
		&snd_aicapcm_playback_ops);
		/* Allocate the DMA buffers */
		err =
		snd_pcm_lib_preallocate_pages_for_all(pcm,
		SNDRV_DMA_TYPE_CONTINUOUS,
		snd_dma_continuous_data
		(GFP_KERNEL),
		AICA_BUFFER_SIZE,
		AICA_BUFFER_SIZE);
		return err;
		}

		/* Mixer controls */
		static int aica_pcmswitch_info(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_info *uinfo)
		{
		uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
		uinfo->count = 1;
		uinfo->value.integer.min = 0;
		uinfo->value.integer.max = 1;
		return 0;
		}

		static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
		{
		ucontrol->value.integer.value[0] = 1; /* TO DO: Fix me */
		return 0;
		}

		static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
		{
		if (ucontrol->value.integer.value[0] == 1)
		return 0; /* TO DO: Fix me */
		else
		aica_chn_halt();
		return 0;
		}

		static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_info *uinfo)
		{
		uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
		uinfo->count = 1;
		uinfo->value.integer.min = 0;
		uinfo->value.integer.max = 0xFF;
		return 0;
		}

		static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
		{
		struct snd_card_aica *dreamcastcard;
		dreamcastcard = kcontrol->private_data;
		if (unlikely(!dreamcastcard->channel))
		return -ETXTBSY; /* we've not yet been set up */
		ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
		return 0;
		}

		static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
		{
		struct snd_card_aica *dreamcastcard;
		dreamcastcard = kcontrol->private_data;
		if (unlikely(!dreamcastcard->channel))
		return -ETXTBSY;
		if (unlikely(dreamcastcard->channel->vol ==
		ucontrol->value.integer.value[0]))
		return 0;
		dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
		dreamcastcard->master_volume = ucontrol->value.integer.value[0];
		spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
		dreamcastcard->channel,
		sizeof(struct aica_channel));

		return 1;
		}

		static struct snd_kcontrol_new snd_aica_pcmswitch_control __devinitdata = {
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = "PCM Playback Switch",
		.index = 0,
		.info = aica_pcmswitch_info,
		.get = aica_pcmswitch_get,
		.put = aica_pcmswitch_put
		};

		static struct snd_kcontrol_new snd_aica_pcmvolume_control __devinitdata = {
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = "PCM Playback Volume",
		.index = 0,
		.info = aica_pcmvolume_info,
		.get = aica_pcmvolume_get,
		.put = aica_pcmvolume_put
		};

		static int load_aica_firmware(void)
		{
		int err;
		const struct firmware *fw_entry;
		spu_reset();
		err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
		if (unlikely(err))
		return err;
		/* write firware into memory */
		spu_disable();
		spu_memload(0, fw_entry->data, fw_entry->size);
		spu_enable();
		release_firmware(fw_entry);
		return err;
		}

		static int __devinit add_aicamixer_controls(struct snd_card_aica
		*dreamcastcard)
		{
		int err;
		err = snd_ctl_add
		(dreamcastcard->card,
		snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
		if (unlikely(err < 0))
		return err;
		err = snd_ctl_add
		(dreamcastcard->card,
		snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
		if (unlikely(err < 0))
		return err;
		return 0;
		}

		static int snd_aica_remove(struct platform_device *devptr)
		{
		struct snd_card_aica *dreamcastcard;
		dreamcastcard = platform_get_drvdata(devptr);
		if (unlikely(!dreamcastcard))
		return -ENODEV;
		snd_card_free(dreamcastcard->card);
		kfree(dreamcastcard);
		platform_set_drvdata(devptr, NULL);
		return 0;
		}

		static int __init snd_aica_probe(struct platform_device *devptr)
		{
		int err;
		struct snd_card_aica *dreamcastcard;
		dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
		if (unlikely(!dreamcastcard))
		return -ENOMEM;
		dreamcastcard->card =
		snd_card_new(index, SND_AICA_DRIVER, THIS_MODULE, 0);
		if (unlikely(!dreamcastcard->card)) {
		kfree(dreamcastcard);
		return -ENODEV;
		}
		strcpy(dreamcastcard->card->driver, "snd_aica");
		strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
		strcpy(dreamcastcard->card->longname,
		"Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
		/* Load the PCM 'chip' */
		err = snd_aicapcmchip(dreamcastcard, 0);
		if (unlikely(err < 0))
		goto freedreamcast;
		snd_card_set_dev(dreamcastcard->card, &devptr->dev);
		dreamcastcard->timer.data = 0;
		dreamcastcard->channel = NULL;
		/* Add basic controls */
		err = add_aicamixer_controls(dreamcastcard);
		if (unlikely(err < 0))
		goto freedreamcast;
		/* Register the card with ALSA subsystem */
		err = snd_card_register(dreamcastcard->card);
		if (unlikely(err < 0))
		goto freedreamcast;
		platform_set_drvdata(devptr, dreamcastcard);
		aica_queue = create_workqueue(CARD_NAME);
		if (unlikely(!aica_queue))
		goto freedreamcast;
		snd_printk
		("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
		return 0;
		freedreamcast:
		snd_card_free(dreamcastcard->card);
		kfree(dreamcastcard);
		return err;
		}

		static struct platform_driver snd_aica_driver = {
		.probe = snd_aica_probe,
		.remove = snd_aica_remove,
		.driver = {
		.name = SND_AICA_DRIVER},
		};

		static int __init aica_init(void)
		{
		int err;
		err = platform_driver_register(&snd_aica_driver);
		if (unlikely(err < 0))
		return err;
		pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
		aica_memory_space, 2);
		if (unlikely(IS_ERR(pd))) {
		platform_driver_unregister(&snd_aica_driver);
		return PTR_ERR(pd);
		}
		/* Load the firmware */
		return load_aica_firmware();
		}

		static void __exit aica_exit(void)
		{
		/* Destroy the aica kernel thread */
		destroy_workqueue(aica_queue);
		platform_device_unregister(pd);
		platform_driver_unregister(&snd_aica_driver);
		/* Kill any sound still playing and reset ARM7 to safe state */
		spu_reset();
		}

		module_init(aica_init);
		module_exit(aica_exit);