[linux-2.6-block.git] / drivers / tty / goldfish.c

/*
 * Copyright (C) 2007 Google, Inc.
 * Copyright (C) 2012 Intel, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */

#include <linux/console.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/goldfish.h>

enum {
	GOLDFISH_TTY_PUT_CHAR       = 0x00,
	GOLDFISH_TTY_BYTES_READY    = 0x04,
	GOLDFISH_TTY_CMD            = 0x08,

	GOLDFISH_TTY_DATA_PTR       = 0x10,
	GOLDFISH_TTY_DATA_LEN       = 0x14,
	GOLDFISH_TTY_DATA_PTR_HIGH  = 0x18,

	GOLDFISH_TTY_CMD_INT_DISABLE    = 0,
	GOLDFISH_TTY_CMD_INT_ENABLE     = 1,
	GOLDFISH_TTY_CMD_WRITE_BUFFER   = 2,
	GOLDFISH_TTY_CMD_READ_BUFFER    = 3,
};

struct goldfish_tty {
	struct tty_port port;
	spinlock_t lock;
	void __iomem *base;
	u32 irq;
	int opencount;
	struct console console;
};

static DEFINE_MUTEX(goldfish_tty_lock);
static struct tty_driver *goldfish_tty_driver;
static u32 goldfish_tty_line_count = 8;
static u32 goldfish_tty_current_line_count;
static struct goldfish_tty *goldfish_ttys;

static void goldfish_tty_do_write(int line, const char *buf, unsigned count)
{
	unsigned long irq_flags;
	struct goldfish_tty *qtty = &goldfish_ttys[line];
	void __iomem *base = qtty->base;
	spin_lock_irqsave(&qtty->lock, irq_flags);
	gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
				base + GOLDFISH_TTY_DATA_PTR_HIGH);
	writel(count, base + GOLDFISH_TTY_DATA_LEN);
	writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD);
	spin_unlock_irqrestore(&qtty->lock, irq_flags);
}

static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
{
	struct platform_device *pdev = dev_id;
	struct goldfish_tty *qtty = &goldfish_ttys[pdev->id];
	void __iomem *base = qtty->base;
	unsigned long irq_flags;
	unsigned char *buf;
	u32 count;

	count = readl(base + GOLDFISH_TTY_BYTES_READY);
	if (count == 0)
		return IRQ_NONE;

	count = tty_prepare_flip_string(&qtty->port, &buf, count);
	spin_lock_irqsave(&qtty->lock, irq_flags);
	gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
				base + GOLDFISH_TTY_DATA_PTR_HIGH);
	writel(count, base + GOLDFISH_TTY_DATA_LEN);
	writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
	spin_unlock_irqrestore(&qtty->lock, irq_flags);
	tty_schedule_flip(&qtty->port);
	return IRQ_HANDLED;
}

static int goldfish_tty_activate(struct tty_port *port, struct tty_struct *tty)
{
	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
									port);
	writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD);
	return 0;
}

static void goldfish_tty_shutdown(struct tty_port *port)
{
	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
									port);
	writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD);
}

static int goldfish_tty_open(struct tty_struct *tty, struct file *filp)
{
	struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
	return tty_port_open(&qtty->port, tty, filp);
}

static void goldfish_tty_close(struct tty_struct *tty, struct file *filp)
{
	tty_port_close(tty->port, tty, filp);
}

static void goldfish_tty_hangup(struct tty_struct *tty)
{
	tty_port_hangup(tty->port);
}

static int goldfish_tty_write(struct tty_struct *tty, const unsigned char *buf,
								int count)
{
	goldfish_tty_do_write(tty->index, buf, count);
	return count;
}

static int goldfish_tty_write_room(struct tty_struct *tty)
{
	return 0x10000;
}

static int goldfish_tty_chars_in_buffer(struct tty_struct *tty)
{
	struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
	void __iomem *base = qtty->base;
	return readl(base + GOLDFISH_TTY_BYTES_READY);
}

static void goldfish_tty_console_write(struct console *co, const char *b,
								unsigned count)
{
	goldfish_tty_do_write(co->index, b, count);
}

static struct tty_driver *goldfish_tty_console_device(struct console *c,
								int *index)
{
	*index = c->index;
	return goldfish_tty_driver;
}

static int goldfish_tty_console_setup(struct console *co, char *options)
{
	if ((unsigned)co->index >= goldfish_tty_line_count)
		return -ENODEV;
	if (!goldfish_ttys[co->index].base)
		return -ENODEV;
	return 0;
}

static struct tty_port_operations goldfish_port_ops = {
	.activate = goldfish_tty_activate,
	.shutdown = goldfish_tty_shutdown
};

static const struct tty_operations goldfish_tty_ops = {
	.open = goldfish_tty_open,
	.close = goldfish_tty_close,
	.hangup = goldfish_tty_hangup,
	.write = goldfish_tty_write,
	.write_room = goldfish_tty_write_room,
	.chars_in_buffer = goldfish_tty_chars_in_buffer,
};

static int goldfish_tty_create_driver(void)
{
	int ret;
	struct tty_driver *tty;

	goldfish_ttys = kzalloc(sizeof(*goldfish_ttys) *
				goldfish_tty_line_count, GFP_KERNEL);
	if (goldfish_ttys == NULL) {
		ret = -ENOMEM;
		goto err_alloc_goldfish_ttys_failed;
	}
	tty = alloc_tty_driver(goldfish_tty_line_count);
	if (tty == NULL) {
		ret = -ENOMEM;
		goto err_alloc_tty_driver_failed;
	}
	tty->driver_name = "goldfish";
	tty->name = "ttyGF";
	tty->type = TTY_DRIVER_TYPE_SERIAL;
	tty->subtype = SERIAL_TYPE_NORMAL;
	tty->init_termios = tty_std_termios;
	tty->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
						TTY_DRIVER_DYNAMIC_DEV;
	tty_set_operations(tty, &goldfish_tty_ops);
	ret = tty_register_driver(tty);
	if (ret)
		goto err_tty_register_driver_failed;

	goldfish_tty_driver = tty;
	return 0;

err_tty_register_driver_failed:
	put_tty_driver(tty);
err_alloc_tty_driver_failed:
	kfree(goldfish_ttys);
	goldfish_ttys = NULL;
err_alloc_goldfish_ttys_failed:
	return ret;
}

static void goldfish_tty_delete_driver(void)
{
	tty_unregister_driver(goldfish_tty_driver);
	put_tty_driver(goldfish_tty_driver);
	goldfish_tty_driver = NULL;
	kfree(goldfish_ttys);
	goldfish_ttys = NULL;
}

static int goldfish_tty_probe(struct platform_device *pdev)
{
	struct goldfish_tty *qtty;
	int ret = -EINVAL;
	struct resource *r;
	struct device *ttydev;
	void __iomem *base;
	u32 irq;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (r == NULL)
		return -EINVAL;

	base = ioremap(r->start, 0x1000);
	if (base == NULL)
		pr_err("goldfish_tty: unable to remap base\n");

	r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (r == NULL)
		goto err_unmap;

	irq = r->start;

	if (pdev->id >= goldfish_tty_line_count)
		goto err_unmap;

	mutex_lock(&goldfish_tty_lock);
	if (goldfish_tty_current_line_count == 0) {
		ret = goldfish_tty_create_driver();
		if (ret)
			goto err_create_driver_failed;
	}
	goldfish_tty_current_line_count++;

	qtty = &goldfish_ttys[pdev->id];
	spin_lock_init(&qtty->lock);
	tty_port_init(&qtty->port);
	qtty->port.ops = &goldfish_port_ops;
	qtty->base = base;
	qtty->irq = irq;

	writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD);

	ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED,
						"goldfish_tty", pdev);
	if (ret)
		goto err_request_irq_failed;


	ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,
							pdev->id, &pdev->dev);
	if (IS_ERR(ttydev)) {
		ret = PTR_ERR(ttydev);
		goto err_tty_register_device_failed;
	}

	strcpy(qtty->console.name, "ttyGF");
	qtty->console.write = goldfish_tty_console_write;
	qtty->console.device = goldfish_tty_console_device;
	qtty->console.setup = goldfish_tty_console_setup;
	qtty->console.flags = CON_PRINTBUFFER;
	qtty->console.index = pdev->id;
	register_console(&qtty->console);

	mutex_unlock(&goldfish_tty_lock);
	return 0;

err_tty_register_device_failed:
	free_irq(irq, pdev);
err_request_irq_failed:
	goldfish_tty_current_line_count--;
	if (goldfish_tty_current_line_count == 0)
		goldfish_tty_delete_driver();
err_create_driver_failed:
	mutex_unlock(&goldfish_tty_lock);
err_unmap:
	iounmap(base);
	return ret;
}

static int goldfish_tty_remove(struct platform_device *pdev)
{
	struct goldfish_tty *qtty;

	mutex_lock(&goldfish_tty_lock);

	qtty = &goldfish_ttys[pdev->id];
	unregister_console(&qtty->console);
	tty_unregister_device(goldfish_tty_driver, pdev->id);
	iounmap(qtty->base);
	qtty->base = NULL;
	free_irq(qtty->irq, pdev);
	goldfish_tty_current_line_count--;
	if (goldfish_tty_current_line_count == 0)
		goldfish_tty_delete_driver();
	mutex_unlock(&goldfish_tty_lock);
	return 0;
}

static struct platform_driver goldfish_tty_platform_driver = {
	.probe = goldfish_tty_probe,
	.remove = goldfish_tty_remove,
	.driver = {
		.name = "goldfish_tty"
	}
};

module_platform_driver(goldfish_tty_platform_driver);

MODULE_LICENSE("GPL v2");
Commit	Line	Data
666b7793 AH	1	/*
	2	* Copyright (C) 2007 Google, Inc.
	3	* Copyright (C) 2012 Intel, Inc.
	4	*
	5	* This software is licensed under the terms of the GNU General Public
	6	* License version 2, as published by the Free Software Foundation, and
	7	* may be copied, distributed, and modified under those terms.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	*/
	15
	16	#include <linux/console.h>
666b7793 AH	17	#include <linux/interrupt.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/tty.h>
	20	#include <linux/tty_flip.h>
	21	#include <linux/slab.h>
	22	#include <linux/io.h>
	23	#include <linux/module.h>
e0f682e0	24	#include <linux/goldfish.h>
666b7793 AH	25
	26	enum {
	27	GOLDFISH_TTY_PUT_CHAR = 0x00,
	28	GOLDFISH_TTY_BYTES_READY = 0x04,
	29	GOLDFISH_TTY_CMD = 0x08,
	30
	31	GOLDFISH_TTY_DATA_PTR = 0x10,
	32	GOLDFISH_TTY_DATA_LEN = 0x14,
b8658bc8	33	GOLDFISH_TTY_DATA_PTR_HIGH = 0x18,
666b7793 AH	34
	35	GOLDFISH_TTY_CMD_INT_DISABLE = 0,
	36	GOLDFISH_TTY_CMD_INT_ENABLE = 1,
	37	GOLDFISH_TTY_CMD_WRITE_BUFFER = 2,
	38	GOLDFISH_TTY_CMD_READ_BUFFER = 3,
	39	};
	40
	41	struct goldfish_tty {
	42	struct tty_port port;
	43	spinlock_t lock;
	44	void __iomem *base;
	45	u32 irq;
	46	int opencount;
	47	struct console console;
	48	};
	49
	50	static DEFINE_MUTEX(goldfish_tty_lock);
	51	static struct tty_driver *goldfish_tty_driver;
	52	static u32 goldfish_tty_line_count = 8;
	53	static u32 goldfish_tty_current_line_count;
	54	static struct goldfish_tty *goldfish_ttys;
	55
	56	static void goldfish_tty_do_write(int line, const char *buf, unsigned count)
	57	{
	58	unsigned long irq_flags;
	59	struct goldfish_tty *qtty = &goldfish_ttys[line];
	60	void __iomem *base = qtty->base;
	61	spin_lock_irqsave(&qtty->lock, irq_flags);
07d783fd	62	gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
e0f682e0	63	base + GOLDFISH_TTY_DATA_PTR_HIGH);
666b7793 AH	64	writel(count, base + GOLDFISH_TTY_DATA_LEN);
	65	writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD);
	66	spin_unlock_irqrestore(&qtty->lock, irq_flags);
	67	}
	68
	69	static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
	70	{
	71	struct platform_device *pdev = dev_id;
	72	struct goldfish_tty *qtty = &goldfish_ttys[pdev->id];
	73	void __iomem *base = qtty->base;
	74	unsigned long irq_flags;
	75	unsigned char *buf;
	76	u32 count;
666b7793 AH	77
666b7793 AH	78	count = readl(base + GOLDFISH_TTY_BYTES_READY);
d78055dc	79	if (count == 0)
666b7793 AH	80	return IRQ_NONE;
666b7793 AH	81
ebcf0981 AC	82	count = tty_prepare_flip_string(&qtty->port, &buf, count);
ebcf0981 AC	83	spin_lock_irqsave(&qtty->lock, irq_flags);
07d783fd	84	gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
e0f682e0	85	base + GOLDFISH_TTY_DATA_PTR_HIGH);
ebcf0981 AC	86	writel(count, base + GOLDFISH_TTY_DATA_LEN);
	87	writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
	88	spin_unlock_irqrestore(&qtty->lock, irq_flags);
	89	tty_schedule_flip(&qtty->port);
666b7793 AH	90	return IRQ_HANDLED;
	91	}
	92
	93	static int goldfish_tty_activate(struct tty_port port, struct tty_struct tty)
	94	{
d78055dc A	95	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
d78055dc A	96	port);
666b7793 AH	97	writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD);
	98	return 0;
	99	}
	100
	101	static void goldfish_tty_shutdown(struct tty_port *port)
	102	{
d78055dc A	103	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
d78055dc A	104	port);
666b7793 AH	105	writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD);
	106	}
	107
d78055dc	108	static int goldfish_tty_open(struct tty_struct tty, struct file filp)
666b7793 AH	109	{
	110	struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
	111	return tty_port_open(&qtty->port, tty, filp);
	112	}
	113
d78055dc	114	static void goldfish_tty_close(struct tty_struct tty, struct file filp)
666b7793 AH	115	{
	116	tty_port_close(tty->port, tty, filp);
	117	}
	118
	119	static void goldfish_tty_hangup(struct tty_struct *tty)
	120	{
	121	tty_port_hangup(tty->port);
	122	}
	123
d78055dc A	124	static int goldfish_tty_write(struct tty_struct tty, const unsigned char buf,
d78055dc A	125	int count)
666b7793 AH	126	{
	127	goldfish_tty_do_write(tty->index, buf, count);
	128	return count;
	129	}
	130
	131	static int goldfish_tty_write_room(struct tty_struct *tty)
	132	{
	133	return 0x10000;
	134	}
	135
	136	static int goldfish_tty_chars_in_buffer(struct tty_struct *tty)
	137	{
	138	struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
	139	void __iomem *base = qtty->base;
	140	return readl(base + GOLDFISH_TTY_BYTES_READY);
	141	}
	142
d78055dc A	143	static void goldfish_tty_console_write(struct console co, const char b,
d78055dc A	144	unsigned count)
666b7793 AH	145	{
	146	goldfish_tty_do_write(co->index, b, count);
	147	}
	148
d78055dc A	149	static struct tty_driver goldfish_tty_console_device(struct console c,
d78055dc A	150	int *index)
666b7793 AH	151	{
	152	*index = c->index;
	153	return goldfish_tty_driver;
	154	}
	155
	156	static int goldfish_tty_console_setup(struct console co, char options)
	157	{
fda2b418	158	if ((unsigned)co->index >= goldfish_tty_line_count)
666b7793	159	return -ENODEV;
a4dc9236	160	if (!goldfish_ttys[co->index].base)
666b7793 AH	161	return -ENODEV;
	162	return 0;
	163	}
	164
	165	static struct tty_port_operations goldfish_port_ops = {
	166	.activate = goldfish_tty_activate,
	167	.shutdown = goldfish_tty_shutdown
	168	};
	169
d78055dc	170	static const struct tty_operations goldfish_tty_ops = {
666b7793 AH	171	.open = goldfish_tty_open,
	172	.close = goldfish_tty_close,
	173	.hangup = goldfish_tty_hangup,
	174	.write = goldfish_tty_write,
	175	.write_room = goldfish_tty_write_room,
	176	.chars_in_buffer = goldfish_tty_chars_in_buffer,
	177	};
	178
	179	static int goldfish_tty_create_driver(void)
	180	{
	181	int ret;
	182	struct tty_driver *tty;
	183
d78055dc A	184	goldfish_ttys = kzalloc(sizeof(goldfish_ttys)
	185	goldfish_tty_line_count, GFP_KERNEL);
	186	if (goldfish_ttys == NULL) {
666b7793 AH	187	ret = -ENOMEM;
	188	goto err_alloc_goldfish_ttys_failed;
	189	}
	190	tty = alloc_tty_driver(goldfish_tty_line_count);
d78055dc	191	if (tty == NULL) {
666b7793 AH	192	ret = -ENOMEM;
	193	goto err_alloc_tty_driver_failed;
	194	}
	195	tty->driver_name = "goldfish";
	196	tty->name = "ttyGF";
	197	tty->type = TTY_DRIVER_TYPE_SERIAL;
	198	tty->subtype = SERIAL_TYPE_NORMAL;
	199	tty->init_termios = tty_std_termios;
d78055dc A	200	tty->flags = TTY_DRIVER_RESET_TERMIOS \| TTY_DRIVER_REAL_RAW \|
d78055dc A	201	TTY_DRIVER_DYNAMIC_DEV;
666b7793 AH	202	tty_set_operations(tty, &goldfish_tty_ops);
666b7793 AH	203	ret = tty_register_driver(tty);
d78055dc	204	if (ret)
666b7793 AH	205	goto err_tty_register_driver_failed;
	206
	207	goldfish_tty_driver = tty;
	208	return 0;
	209
	210	err_tty_register_driver_failed:
	211	put_tty_driver(tty);
	212	err_alloc_tty_driver_failed:
	213	kfree(goldfish_ttys);
	214	goldfish_ttys = NULL;
	215	err_alloc_goldfish_ttys_failed:
	216	return ret;
	217	}
	218
	219	static void goldfish_tty_delete_driver(void)
	220	{
	221	tty_unregister_driver(goldfish_tty_driver);
	222	put_tty_driver(goldfish_tty_driver);
	223	goldfish_tty_driver = NULL;
	224	kfree(goldfish_ttys);
	225	goldfish_ttys = NULL;
	226	}
	227
	228	static int goldfish_tty_probe(struct platform_device *pdev)
	229	{
	230	struct goldfish_tty *qtty;
	231	int ret = -EINVAL;
666b7793 AH	232	struct resource *r;
	233	struct device *ttydev;
	234	void __iomem *base;
	235	u32 irq;
	236
	237	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
d78055dc	238	if (r == NULL)
666b7793 AH	239	return -EINVAL;
	240
	241	base = ioremap(r->start, 0x1000);
	242	if (base == NULL)
	243	pr_err("goldfish_tty: unable to remap base\n");
	244
	245	r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
d78055dc	246	if (r == NULL)
666b7793 AH	247	goto err_unmap;
	248
	249	irq = r->start;
	250
d78055dc	251	if (pdev->id >= goldfish_tty_line_count)
666b7793 AH	252	goto err_unmap;
	253
	254	mutex_lock(&goldfish_tty_lock);
d78055dc	255	if (goldfish_tty_current_line_count == 0) {
666b7793	256	ret = goldfish_tty_create_driver();
d78055dc	257	if (ret)
666b7793 AH	258	goto err_create_driver_failed;
	259	}
	260	goldfish_tty_current_line_count++;
	261
	262	qtty = &goldfish_ttys[pdev->id];
	263	spin_lock_init(&qtty->lock);
	264	tty_port_init(&qtty->port);
	265	qtty->port.ops = &goldfish_port_ops;
	266	qtty->base = base;
	267	qtty->irq = irq;
	268
	269	writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD);
	270
d78055dc A	271	ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED,
	272	"goldfish_tty", pdev);
	273	if (ret)
666b7793 AH	274	goto err_request_irq_failed;
	275
	276
	277	ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,
	278	pdev->id, &pdev->dev);
d78055dc	279	if (IS_ERR(ttydev)) {
666b7793 AH	280	ret = PTR_ERR(ttydev);
	281	goto err_tty_register_device_failed;
	282	}
	283
	284	strcpy(qtty->console.name, "ttyGF");
	285	qtty->console.write = goldfish_tty_console_write;
	286	qtty->console.device = goldfish_tty_console_device;
	287	qtty->console.setup = goldfish_tty_console_setup;
	288	qtty->console.flags = CON_PRINTBUFFER;
	289	qtty->console.index = pdev->id;
	290	register_console(&qtty->console);
	291
	292	mutex_unlock(&goldfish_tty_lock);
	293	return 0;
	294
666b7793 AH	295	err_tty_register_device_failed:
	296	free_irq(irq, pdev);
	297	err_request_irq_failed:
	298	goldfish_tty_current_line_count--;
d78055dc	299	if (goldfish_tty_current_line_count == 0)
666b7793 AH	300	goldfish_tty_delete_driver();
	301	err_create_driver_failed:
	302	mutex_unlock(&goldfish_tty_lock);
	303	err_unmap:
	304	iounmap(base);
	305	return ret;
	306	}
	307
	308	static int goldfish_tty_remove(struct platform_device *pdev)
	309	{
	310	struct goldfish_tty *qtty;
	311
	312	mutex_lock(&goldfish_tty_lock);
	313
	314	qtty = &goldfish_ttys[pdev->id];
	315	unregister_console(&qtty->console);
	316	tty_unregister_device(goldfish_tty_driver, pdev->id);
	317	iounmap(qtty->base);
a4dc9236	318	qtty->base = NULL;
666b7793 AH	319	free_irq(qtty->irq, pdev);
666b7793 AH	320	goldfish_tty_current_line_count--;
d78055dc	321	if (goldfish_tty_current_line_count == 0)
666b7793 AH	322	goldfish_tty_delete_driver();
	323	mutex_unlock(&goldfish_tty_lock);
	324	return 0;
	325	}
	326
	327	static struct platform_driver goldfish_tty_platform_driver = {
	328	.probe = goldfish_tty_probe,
	329	.remove = goldfish_tty_remove,
	330	.driver = {
	331	.name = "goldfish_tty"
	332	}
	333	};
	334
	335	module_platform_driver(goldfish_tty_platform_driver);
	336
	337	MODULE_LICENSE("GPL v2");