[linux-block.git] / drivers / staging / goldfish / goldfish_audio.c

// SPDX-License-Identifier: GPL-2.0
/*
 * drivers/misc/goldfish_audio.c
 *
 * Copyright (C) 2007 Google, Inc.
 * Copyright (C) 2012 Intel, Inc.
 */

#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/sched.h>
#include <linux/dma-mapping.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/goldfish.h>
#include <linux/acpi.h>

MODULE_AUTHOR("Google, Inc.");
MODULE_DESCRIPTION("Android QEMU Audio Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.0");

struct goldfish_audio {
	char __iomem *reg_base;
	int irq;

	/* lock protects access to buffer_status and to device registers */
	spinlock_t lock;
	wait_queue_head_t wait;

	char *buffer_virt;		/* combined buffer virtual address */
	unsigned long buffer_phys;	/* combined buffer physical address */

	char *write_buffer1;		/* write buffer 1 virtual address */
	char *write_buffer2;		/* write buffer 2 virtual address */
	char *read_buffer;		/* read buffer virtual address */
	int buffer_status;
	int read_supported;	/* true if we have audio input support */
};

/*
 *  We will allocate two read buffers and two write buffers.
 *  Having two read buffers facilitate stereo -> mono conversion.
 *  Having two write buffers facilitate interleaved IO.
 */
#define READ_BUFFER_SIZE	16384
#define WRITE_BUFFER_SIZE	16384
#define COMBINED_BUFFER_SIZE	((2 * READ_BUFFER_SIZE) + \
					(2 * WRITE_BUFFER_SIZE))

/*
 *  temporary variable used between goldfish_audio_probe() and
 *  goldfish_audio_open()
 */
static struct goldfish_audio *audio_data;

enum {
	/* audio status register */
	AUDIO_INT_STATUS	= 0x00,
	/* set this to enable IRQ */
	AUDIO_INT_ENABLE	= 0x04,
	/* set these to specify buffer addresses */
	AUDIO_SET_WRITE_BUFFER_1 = 0x08,
	AUDIO_SET_WRITE_BUFFER_2 = 0x0C,
	/* set number of bytes in buffer to write */
	AUDIO_WRITE_BUFFER_1  = 0x10,
	AUDIO_WRITE_BUFFER_2  = 0x14,
	AUDIO_SET_WRITE_BUFFER_1_HIGH = 0x28,
	AUDIO_SET_WRITE_BUFFER_2_HIGH = 0x30,

	/* true if audio input is supported */
	AUDIO_READ_SUPPORTED = 0x18,
	/* buffer to use for audio input */
	AUDIO_SET_READ_BUFFER = 0x1C,
	AUDIO_SET_READ_BUFFER_HIGH = 0x34,

	/* driver writes number of bytes to read */
	AUDIO_START_READ  = 0x20,

	/* number of bytes available in read buffer */
	AUDIO_READ_BUFFER_AVAILABLE  = 0x24,

	/* AUDIO_INT_STATUS bits */

	/* this bit set when it is safe to write more bytes to the buffer */
	AUDIO_INT_WRITE_BUFFER_1_EMPTY	= 1U << 0,
	AUDIO_INT_WRITE_BUFFER_2_EMPTY	= 1U << 1,
	AUDIO_INT_READ_BUFFER_FULL	= 1U << 2,

	AUDIO_INT_MASK			= AUDIO_INT_WRITE_BUFFER_1_EMPTY |
					  AUDIO_INT_WRITE_BUFFER_2_EMPTY |
					  AUDIO_INT_READ_BUFFER_FULL,
};

static atomic_t open_count = ATOMIC_INIT(0);

static unsigned int audio_read(const struct goldfish_audio *data, int addr)
{
	return readl(data->reg_base + addr);
}

static void audio_write(const struct goldfish_audio *data,
			int addr, unsigned int x)
{
	writel(x, data->reg_base + addr);
}

static void audio_write64(const struct goldfish_audio *data,
			  int addr_lo, int addr_hi, unsigned int x)
{
	char __iomem *reg_base = data->reg_base;

	gf_write_dma_addr(x, reg_base + addr_lo, reg_base + addr_hi);
}

static ssize_t goldfish_audio_read(struct file *fp, char __user *buf,
				   size_t count, loff_t *pos)
{
	struct goldfish_audio *data = fp->private_data;
	unsigned long irq_flags;
	int length;
	int result = 0;

	if (!data->read_supported)
		return -ENODEV;

	while (count > 0) {
		length = (count > READ_BUFFER_SIZE ? READ_BUFFER_SIZE : count);
		audio_write(data, AUDIO_START_READ, length);

		wait_event_interruptible(data->wait, data->buffer_status &
					 AUDIO_INT_READ_BUFFER_FULL);

		spin_lock_irqsave(&data->lock, irq_flags);
		data->buffer_status &= ~AUDIO_INT_READ_BUFFER_FULL;
		spin_unlock_irqrestore(&data->lock, irq_flags);

		length = audio_read(data, AUDIO_READ_BUFFER_AVAILABLE);

		/* copy data to user space */
		if (copy_to_user(buf, data->read_buffer, length))
			return -EFAULT;

		result += length;
		buf += length;
		count -= length;
	}
	return result;
}

static ssize_t goldfish_audio_write(struct file *fp, const char __user *buf,
				    size_t count, loff_t *pos)
{
	struct goldfish_audio *data = fp->private_data;
	unsigned long irq_flags;
	ssize_t result = 0;
	char *kbuf;

	while (count > 0) {
		ssize_t copy = count;

		if (copy > WRITE_BUFFER_SIZE)
			copy = WRITE_BUFFER_SIZE;
		wait_event_interruptible(data->wait, data->buffer_status &
					(AUDIO_INT_WRITE_BUFFER_1_EMPTY |
					AUDIO_INT_WRITE_BUFFER_2_EMPTY));

		if ((data->buffer_status & AUDIO_INT_WRITE_BUFFER_1_EMPTY) != 0)
			kbuf = data->write_buffer1;
		else
			kbuf = data->write_buffer2;

		/* copy from user space to the appropriate buffer */
		if (copy_from_user(kbuf, buf, copy)) {
			result = -EFAULT;
			break;
		}

		spin_lock_irqsave(&data->lock, irq_flags);
		/*
		 *  clear the buffer empty flag, and signal the emulator
		 *  to start writing the buffer
		 */
		if (kbuf == data->write_buffer1) {
			data->buffer_status &= ~AUDIO_INT_WRITE_BUFFER_1_EMPTY;
			audio_write(data, AUDIO_WRITE_BUFFER_1, copy);
		} else {
			data->buffer_status &= ~AUDIO_INT_WRITE_BUFFER_2_EMPTY;
			audio_write(data, AUDIO_WRITE_BUFFER_2, copy);
		}
		spin_unlock_irqrestore(&data->lock, irq_flags);

		buf += copy;
		result += copy;
		count -= copy;
	}
	return result;
}

static int goldfish_audio_open(struct inode *ip, struct file *fp)
{
	if (!audio_data)
		return -ENODEV;

	if (atomic_inc_return(&open_count) == 1) {
		fp->private_data = audio_data;
		audio_data->buffer_status = (AUDIO_INT_WRITE_BUFFER_1_EMPTY |
					     AUDIO_INT_WRITE_BUFFER_2_EMPTY);
		audio_write(audio_data, AUDIO_INT_ENABLE, AUDIO_INT_MASK);
		return 0;
	}

	atomic_dec(&open_count);
	return -EBUSY;
}

static int goldfish_audio_release(struct inode *ip, struct file *fp)
{
	atomic_dec(&open_count);
	/* FIXME: surely this is wrong for the multi-opened case */
	audio_write(audio_data, AUDIO_INT_ENABLE, 0);
	return 0;
}

static long goldfish_audio_ioctl(struct file *fp, unsigned int cmd,
				 unsigned long arg)
{
	/* temporary workaround, until we switch to the ALSA API */
	if (cmd == 315)
		return -1;

	return 0;
}

static irqreturn_t goldfish_audio_interrupt(int irq, void *dev_id)
{
	unsigned long irq_flags;
	struct goldfish_audio	*data = dev_id;
	u32 status;

	spin_lock_irqsave(&data->lock, irq_flags);

	/* read buffer status flags */
	status = audio_read(data, AUDIO_INT_STATUS);
	status &= AUDIO_INT_MASK;
	/*
	 *  if buffers are newly empty, wake up blocked
	 *  goldfish_audio_write() call
	 */
	if (status) {
		data->buffer_status = status;
		wake_up(&data->wait);
	}

	spin_unlock_irqrestore(&data->lock, irq_flags);
	return status ? IRQ_HANDLED : IRQ_NONE;
}

/* file operations for /dev/eac */
static const struct file_operations goldfish_audio_fops = {
	.owner = THIS_MODULE,
	.read = goldfish_audio_read,
	.write = goldfish_audio_write,
	.open = goldfish_audio_open,
	.release = goldfish_audio_release,
	.unlocked_ioctl = goldfish_audio_ioctl,
};

static struct miscdevice goldfish_audio_device = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "eac",
	.fops = &goldfish_audio_fops,
};

static int goldfish_audio_probe(struct platform_device *pdev)
{
	int ret;
	struct resource *r;
	struct goldfish_audio *data;
	dma_addr_t buf_addr;

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;
	spin_lock_init(&data->lock);
	init_waitqueue_head(&data->wait);
	platform_set_drvdata(pdev, data);

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r) {
		dev_err(&pdev->dev, "platform_get_resource failed\n");
		return -ENODEV;
	}
	data->reg_base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);
	if (!data->reg_base)
		return -ENOMEM;

	data->irq = platform_get_irq(pdev, 0);
	if (data->irq < 0) {
		dev_err(&pdev->dev, "platform_get_irq failed\n");
		return -ENODEV;
	}
	data->buffer_virt = dmam_alloc_coherent(&pdev->dev,
						COMBINED_BUFFER_SIZE,
						&buf_addr, GFP_KERNEL);
	if (!data->buffer_virt) {
		dev_err(&pdev->dev, "allocate buffer failed\n");
		return -ENOMEM;
	}
	data->buffer_phys = buf_addr;
	data->write_buffer1 = data->buffer_virt;
	data->write_buffer2 = data->buffer_virt + WRITE_BUFFER_SIZE;
	data->read_buffer = data->buffer_virt + 2 * WRITE_BUFFER_SIZE;

	ret = devm_request_irq(&pdev->dev, data->irq, goldfish_audio_interrupt,
			       IRQF_SHARED, pdev->name, data);
	if (ret) {
		dev_err(&pdev->dev, "request_irq failed\n");
		return ret;
	}

	ret = misc_register(&goldfish_audio_device);
	if (ret) {
		dev_err(&pdev->dev,
			"misc_register returned %d in goldfish_audio_init\n",
								ret);
		return ret;
	}

	audio_write64(data, AUDIO_SET_WRITE_BUFFER_1,
		      AUDIO_SET_WRITE_BUFFER_1_HIGH, buf_addr);
	buf_addr += WRITE_BUFFER_SIZE;

	audio_write64(data, AUDIO_SET_WRITE_BUFFER_2,
		      AUDIO_SET_WRITE_BUFFER_2_HIGH, buf_addr);

	buf_addr += WRITE_BUFFER_SIZE;

	data->read_supported = audio_read(data, AUDIO_READ_SUPPORTED);
	if (data->read_supported)
		audio_write64(data, AUDIO_SET_READ_BUFFER,
			      AUDIO_SET_READ_BUFFER_HIGH, buf_addr);

	audio_data = data;
	return 0;
}

static int goldfish_audio_remove(struct platform_device *pdev)
{
	misc_deregister(&goldfish_audio_device);
	audio_data = NULL;
	return 0;
}

static const struct of_device_id goldfish_audio_of_match[] = {
	{ .compatible = "google,goldfish-audio", },
	{},
};
MODULE_DEVICE_TABLE(of, goldfish_audio_of_match);

#ifdef CONFIG_ACPI
static const struct acpi_device_id goldfish_audio_acpi_match[] = {
	{ "GFSH0005", 0 },
	{ },
};
MODULE_DEVICE_TABLE(acpi, goldfish_audio_acpi_match);
#endif

static struct platform_driver goldfish_audio_driver = {
	.probe		= goldfish_audio_probe,
	.remove		= goldfish_audio_remove,
	.driver = {
		.name = "goldfish_audio",
		.of_match_table = goldfish_audio_of_match,
		.acpi_match_table = ACPI_PTR(goldfish_audio_acpi_match),
	}
};

module_platform_driver(goldfish_audio_driver);
Commit	Line	Data
08925742	1	// SPDX-License-Identifier: GPL-2.0
ad28497c SB	2	/*
ad28497c SB	3	* drivers/misc/goldfish_audio.c
2e82b83d AC	4	*
	5	* Copyright (C) 2007 Google, Inc.
	6	* Copyright (C) 2012 Intel, Inc.
2e82b83d AC	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/miscdevice.h>
	11	#include <linux/fs.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/types.h>
	14	#include <linux/pci.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/io.h>
	17	#include <linux/sched.h>
	18	#include <linux/dma-mapping.h>
	19	#include <linux/uaccess.h>
45321507	20	#include <linux/slab.h>
f6279717	21	#include <linux/goldfish.h>
06e526f4	22	#include <linux/acpi.h>
2e82b83d AC	23
	24	MODULE_AUTHOR("Google, Inc.");
	25	MODULE_DESCRIPTION("Android QEMU Audio Driver");
	26	MODULE_LICENSE("GPL");
	27	MODULE_VERSION("1.0");
	28
	29	struct goldfish_audio {
	30	char __iomem *reg_base;
	31	int irq;
24daa451	32
9b61f085	33	/* lock protects access to buffer_status and to device registers */
2e82b83d AC	34	spinlock_t lock;
	35	wait_queue_head_t wait;
	36
82fdb8dd	37	char buffer_virt; / combined buffer virtual address */
683a060a	38	unsigned long buffer_phys; /* combined buffer physical address */
2e82b83d	39
82fdb8dd RRD	40	char write_buffer1; / write buffer 1 virtual address */
	41	char write_buffer2; / write buffer 2 virtual address */
	42	char read_buffer; / read buffer virtual address */
2e82b83d	43	int buffer_status;
683a060a	44	int read_supported; /* true if we have audio input support */
2e82b83d AC	45	};
2e82b83d AC	46
ad28497c SB	47	/*
	48	* We will allocate two read buffers and two write buffers.
	49	* Having two read buffers facilitate stereo -> mono conversion.
	50	* Having two write buffers facilitate interleaved IO.
	51	*/
683a060a RK	52	#define READ_BUFFER_SIZE 16384
	53	#define WRITE_BUFFER_SIZE 16384
	54	#define COMBINED_BUFFER_SIZE ((2 * READ_BUFFER_SIZE) + \
2e82b83d AC	55	(2 * WRITE_BUFFER_SIZE))
2e82b83d AC	56
ad28497c SB	57	/*
	58	* temporary variable used between goldfish_audio_probe() and
	59	* goldfish_audio_open()
	60	*/
2e82b83d AC	61	static struct goldfish_audio *audio_data;
	62
	63	enum {
	64	/* audio status register */
	65	AUDIO_INT_STATUS = 0x00,
	66	/* set this to enable IRQ */
	67	AUDIO_INT_ENABLE = 0x04,
	68	/* set these to specify buffer addresses */
	69	AUDIO_SET_WRITE_BUFFER_1 = 0x08,
	70	AUDIO_SET_WRITE_BUFFER_2 = 0x0C,
	71	/* set number of bytes in buffer to write */
	72	AUDIO_WRITE_BUFFER_1 = 0x10,
	73	AUDIO_WRITE_BUFFER_2 = 0x14,
c3c1ba66 JT	74	AUDIO_SET_WRITE_BUFFER_1_HIGH = 0x28,
c3c1ba66 JT	75	AUDIO_SET_WRITE_BUFFER_2_HIGH = 0x30,
2e82b83d AC	76
	77	/* true if audio input is supported */
	78	AUDIO_READ_SUPPORTED = 0x18,
	79	/* buffer to use for audio input */
	80	AUDIO_SET_READ_BUFFER = 0x1C,
c3c1ba66	81	AUDIO_SET_READ_BUFFER_HIGH = 0x34,
2e82b83d AC	82
	83	/* driver writes number of bytes to read */
	84	AUDIO_START_READ = 0x20,
	85
	86	/* number of bytes available in read buffer */
	87	AUDIO_READ_BUFFER_AVAILABLE = 0x24,
	88
	89	/* AUDIO_INT_STATUS bits */
	90
	91	/* this bit set when it is safe to write more bytes to the buffer */
	92	AUDIO_INT_WRITE_BUFFER_1_EMPTY = 1U << 0,
	93	AUDIO_INT_WRITE_BUFFER_2_EMPTY = 1U << 1,
683a060a	94	AUDIO_INT_READ_BUFFER_FULL = 1U << 2,
2e82b83d	95
683a060a	96	AUDIO_INT_MASK = AUDIO_INT_WRITE_BUFFER_1_EMPTY \|
2e82b83d AC	97	AUDIO_INT_WRITE_BUFFER_2_EMPTY \|
	98	AUDIO_INT_READ_BUFFER_FULL,
	99	};
	100
2e82b83d AC	101	static atomic_t open_count = ATOMIC_INIT(0);
2e82b83d AC	102
a75647d1 RK	103	static unsigned int audio_read(const struct goldfish_audio *data, int addr)
	104	{
	105	return readl(data->reg_base + addr);
	106	}
	107
	108	static void audio_write(const struct goldfish_audio *data,
	109	int addr, unsigned int x)
	110	{
	111	writel(x, data->reg_base + addr);
	112	}
	113
	114	static void audio_write64(const struct goldfish_audio *data,
	115	int addr_lo, int addr_hi, unsigned int x)
	116	{
	117	char __iomem *reg_base = data->reg_base;
	118
	119	gf_write_dma_addr(x, reg_base + addr_lo, reg_base + addr_hi);
	120	}
	121
2e82b83d	122	static ssize_t goldfish_audio_read(struct file fp, char __user buf,
8f52e264	123	size_t count, loff_t *pos)
2e82b83d AC	124	{
2e82b83d AC	125	struct goldfish_audio *data = fp->private_data;
3053339b	126	unsigned long irq_flags;
2e82b83d AC	127	int length;
	128	int result = 0;
	129
	130	if (!data->read_supported)
	131	return -ENODEV;
	132
	133	while (count > 0) {
	134	length = (count > READ_BUFFER_SIZE ? READ_BUFFER_SIZE : count);
a75647d1	135	audio_write(data, AUDIO_START_READ, length);
2e82b83d	136
d7d3e898 AM	137	wait_event_interruptible(data->wait, data->buffer_status &
d7d3e898 AM	138	AUDIO_INT_READ_BUFFER_FULL);
2e82b83d	139
3053339b JL	140	spin_lock_irqsave(&data->lock, irq_flags);
	141	data->buffer_status &= ~AUDIO_INT_READ_BUFFER_FULL;
	142	spin_unlock_irqrestore(&data->lock, irq_flags);
	143
a75647d1	144	length = audio_read(data, AUDIO_READ_BUFFER_AVAILABLE);
2e82b83d AC	145
	146	/* copy data to user space */
	147	if (copy_to_user(buf, data->read_buffer, length))
	148	return -EFAULT;
	149
	150	result += length;
	151	buf += length;
	152	count -= length;
	153	}
	154	return result;
	155	}
	156
	157	static ssize_t goldfish_audio_write(struct file fp, const char __user buf,
8f52e264	158	size_t count, loff_t *pos)
2e82b83d AC	159	{
	160	struct goldfish_audio *data = fp->private_data;
	161	unsigned long irq_flags;
	162	ssize_t result = 0;
82fdb8dd	163	char *kbuf;
2e82b83d AC	164
	165	while (count > 0) {
	166	ssize_t copy = count;
ef323812	167
2e82b83d AC	168	if (copy > WRITE_BUFFER_SIZE)
2e82b83d AC	169	copy = WRITE_BUFFER_SIZE;
d7d3e898	170	wait_event_interruptible(data->wait, data->buffer_status &
2e82b83d	171	(AUDIO_INT_WRITE_BUFFER_1_EMPTY \|
d7d3e898	172	AUDIO_INT_WRITE_BUFFER_2_EMPTY));
2e82b83d AC	173
	174	if ((data->buffer_status & AUDIO_INT_WRITE_BUFFER_1_EMPTY) != 0)
	175	kbuf = data->write_buffer1;
	176	else
	177	kbuf = data->write_buffer2;
	178
	179	/* copy from user space to the appropriate buffer */
	180	if (copy_from_user(kbuf, buf, copy)) {
	181	result = -EFAULT;
	182	break;
	183	}
	184
	185	spin_lock_irqsave(&data->lock, irq_flags);
ad28497c SB	186	/*
	187	* clear the buffer empty flag, and signal the emulator
	188	* to start writing the buffer
	189	*/
2e82b83d AC	190	if (kbuf == data->write_buffer1) {
2e82b83d AC	191	data->buffer_status &= ~AUDIO_INT_WRITE_BUFFER_1_EMPTY;
a75647d1	192	audio_write(data, AUDIO_WRITE_BUFFER_1, copy);
2e82b83d AC	193	} else {
2e82b83d AC	194	data->buffer_status &= ~AUDIO_INT_WRITE_BUFFER_2_EMPTY;
a75647d1	195	audio_write(data, AUDIO_WRITE_BUFFER_2, copy);
2e82b83d AC	196	}
	197	spin_unlock_irqrestore(&data->lock, irq_flags);
	198
	199	buf += copy;
	200	result += copy;
	201	count -= copy;
	202	}
	203	return result;
	204	}
	205
	206	static int goldfish_audio_open(struct inode ip, struct file fp)
	207	{
	208	if (!audio_data)
	209	return -ENODEV;
	210
	211	if (atomic_inc_return(&open_count) == 1) {
	212	fp->private_data = audio_data;
	213	audio_data->buffer_status = (AUDIO_INT_WRITE_BUFFER_1_EMPTY \|
	214	AUDIO_INT_WRITE_BUFFER_2_EMPTY);
a75647d1	215	audio_write(audio_data, AUDIO_INT_ENABLE, AUDIO_INT_MASK);
2e82b83d	216	return 0;
2e82b83d	217	}
92271551 HT	218
	219	atomic_dec(&open_count);
	220	return -EBUSY;
2e82b83d AC	221	}
	222
	223	static int goldfish_audio_release(struct inode ip, struct file fp)
	224	{
	225	atomic_dec(&open_count);
	226	/* FIXME: surely this is wrong for the multi-opened case */
a75647d1	227	audio_write(audio_data, AUDIO_INT_ENABLE, 0);
2e82b83d AC	228	return 0;
	229	}
	230
	231	static long goldfish_audio_ioctl(struct file *fp, unsigned int cmd,
8f52e264	232	unsigned long arg)
2e82b83d AC	233	{
	234	/* temporary workaround, until we switch to the ALSA API */
	235	if (cmd == 315)
	236	return -1;
92271551 HT	237
92271551 HT	238	return 0;
2e82b83d AC	239	}
	240
	241	static irqreturn_t goldfish_audio_interrupt(int irq, void *dev_id)
	242	{
	243	unsigned long irq_flags;
	244	struct goldfish_audio *data = dev_id;
	245	u32 status;
	246
	247	spin_lock_irqsave(&data->lock, irq_flags);
	248
	249	/* read buffer status flags */
a75647d1	250	status = audio_read(data, AUDIO_INT_STATUS);
2e82b83d	251	status &= AUDIO_INT_MASK;
ad28497c SB	252	/*
	253	* if buffers are newly empty, wake up blocked
	254	* goldfish_audio_write() call
	255	*/
2e82b83d AC	256	if (status) {
	257	data->buffer_status = status;
	258	wake_up(&data->wait);
	259	}
	260
	261	spin_unlock_irqrestore(&data->lock, irq_flags);
	262	return status ? IRQ_HANDLED : IRQ_NONE;
	263	}
	264
	265	/* file operations for /dev/eac */
	266	static const struct file_operations goldfish_audio_fops = {
	267	.owner = THIS_MODULE,
	268	.read = goldfish_audio_read,
	269	.write = goldfish_audio_write,
	270	.open = goldfish_audio_open,
	271	.release = goldfish_audio_release,
	272	.unlocked_ioctl = goldfish_audio_ioctl,
	273	};
	274
	275	static struct miscdevice goldfish_audio_device = {
	276	.minor = MISC_DYNAMIC_MINOR,
	277	.name = "eac",
	278	.fops = &goldfish_audio_fops,
	279	};
	280
	281	static int goldfish_audio_probe(struct platform_device *pdev)
	282	{
	283	int ret;
	284	struct resource *r;
	285	struct goldfish_audio *data;
	286	dma_addr_t buf_addr;
	287
85f28332	288	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
6e3f3bb8	289	if (!data)
85f28332	290	return -ENOMEM;
2e82b83d AC	291	spin_lock_init(&data->lock);
	292	init_waitqueue_head(&data->wait);
	293	platform_set_drvdata(pdev, data);
	294
	295	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
269ad6e0	296	if (!r) {
2e82b83d	297	dev_err(&pdev->dev, "platform_get_resource failed\n");
85f28332	298	return -ENODEV;
2e82b83d	299	}
85f28332	300	data->reg_base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);
269ad6e0	301	if (!data->reg_base)
85f28332	302	return -ENOMEM;
2e82b83d AC	303
	304	data->irq = platform_get_irq(pdev, 0);
	305	if (data->irq < 0) {
	306	dev_err(&pdev->dev, "platform_get_irq failed\n");
85f28332	307	return -ENODEV;
2e82b83d	308	}
85f28332	309	data->buffer_virt = dmam_alloc_coherent(&pdev->dev,
eee222db RK	310	COMBINED_BUFFER_SIZE,
eee222db RK	311	&buf_addr, GFP_KERNEL);
269ad6e0	312	if (!data->buffer_virt) {
2e82b83d	313	dev_err(&pdev->dev, "allocate buffer failed\n");
85f28332	314	return -ENOMEM;
2e82b83d AC	315	}
	316	data->buffer_phys = buf_addr;
	317	data->write_buffer1 = data->buffer_virt;
	318	data->write_buffer2 = data->buffer_virt + WRITE_BUFFER_SIZE;
	319	data->read_buffer = data->buffer_virt + 2 * WRITE_BUFFER_SIZE;
	320
85f28332	321	ret = devm_request_irq(&pdev->dev, data->irq, goldfish_audio_interrupt,
8f52e264	322	IRQF_SHARED, pdev->name, data);
2e82b83d AC	323	if (ret) {
2e82b83d AC	324	dev_err(&pdev->dev, "request_irq failed\n");
85f28332	325	return ret;
2e82b83d AC	326	}
	327
	328	ret = misc_register(&goldfish_audio_device);
	329	if (ret) {
	330	dev_err(&pdev->dev,
	331	"misc_register returned %d in goldfish_audio_init\n",
	332	ret);
85f28332	333	return ret;
2e82b83d AC	334	}
2e82b83d AC	335
a75647d1	336	audio_write64(data, AUDIO_SET_WRITE_BUFFER_1,
8f52e264	337	AUDIO_SET_WRITE_BUFFER_1_HIGH, buf_addr);
f6279717	338	buf_addr += WRITE_BUFFER_SIZE;
c3c1ba66	339
a75647d1	340	audio_write64(data, AUDIO_SET_WRITE_BUFFER_2,
8f52e264	341	AUDIO_SET_WRITE_BUFFER_2_HIGH, buf_addr);
c3c1ba66	342
f6279717	343	buf_addr += WRITE_BUFFER_SIZE;
2e82b83d	344
a75647d1	345	data->read_supported = audio_read(data, AUDIO_READ_SUPPORTED);
2e82b83d	346	if (data->read_supported)
a75647d1	347	audio_write64(data, AUDIO_SET_READ_BUFFER,
8f52e264	348	AUDIO_SET_READ_BUFFER_HIGH, buf_addr);
2e82b83d AC	349
	350	audio_data = data;
	351	return 0;
2e82b83d AC	352	}
	353
	354	static int goldfish_audio_remove(struct platform_device *pdev)
	355	{
2e82b83d	356	misc_deregister(&goldfish_audio_device);
2e82b83d AC	357	audio_data = NULL;
	358	return 0;
	359	}
	360
283ded10 GH	361	static const struct of_device_id goldfish_audio_of_match[] = {
	362	{ .compatible = "google,goldfish-audio", },
	363	{},
	364	};
	365	MODULE_DEVICE_TABLE(of, goldfish_audio_of_match);
	366
06e526f4 YN	367	#ifdef CONFIG_ACPI
	368	static const struct acpi_device_id goldfish_audio_acpi_match[] = {
	369	{ "GFSH0005", 0 },
	370	{ },
	371	};
	372	MODULE_DEVICE_TABLE(acpi, goldfish_audio_acpi_match);
	373	#endif
	374
2e82b83d AC	375	static struct platform_driver goldfish_audio_driver = {
	376	.probe = goldfish_audio_probe,
	377	.remove = goldfish_audio_remove,
	378	.driver = {
283ded10 GH	379	.name = "goldfish_audio",
283ded10 GH	380	.of_match_table = goldfish_audio_of_match,
06e526f4	381	.acpi_match_table = ACPI_PTR(goldfish_audio_acpi_match),
2e82b83d AC	382	}
	383	};
	384
	385	module_platform_driver(goldfish_audio_driver);