[deliverable/linux.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 goldfish_tty *qtty = dev_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 const 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;
	unsigned int line;

	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;

	mutex_lock(&goldfish_tty_lock);

	if (pdev->id == PLATFORM_DEVID_NONE)
		line = goldfish_tty_current_line_count;
	else
		line = pdev->id;

	if (line >= goldfish_tty_line_count)
		goto err_create_driver_failed;

	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[line];
	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", qtty);
	if (ret)
		goto err_request_irq_failed;


	ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,
							line, &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 = line;
	register_console(&qtty->console);
	platform_set_drvdata(pdev, qtty);

	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 = platform_get_drvdata(pdev);

	mutex_lock(&goldfish_tty_lock);

	unregister_console(&qtty->console);
	tty_unregister_device(goldfish_tty_driver, qtty->console.index);
	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 const struct of_device_id goldfish_tty_of_match[] = {
	{ .compatible = "google,goldfish-tty", },
	{},
};

MODULE_DEVICE_TABLE(of, goldfish_tty_of_match);

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

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	{
465893e1	71	struct goldfish_tty *qtty = dev_id;
666b7793 AH	72	void __iomem *base = qtty->base;
	73	unsigned long irq_flags;
	74	unsigned char *buf;
	75	u32 count;
666b7793 AH	76
666b7793 AH	77	count = readl(base + GOLDFISH_TTY_BYTES_READY);
d78055dc	78	if (count == 0)
666b7793 AH	79	return IRQ_NONE;
666b7793 AH	80
ebcf0981 AC	81	count = tty_prepare_flip_string(&qtty->port, &buf, count);
ebcf0981 AC	82	spin_lock_irqsave(&qtty->lock, irq_flags);
07d783fd	83	gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
e0f682e0	84	base + GOLDFISH_TTY_DATA_PTR_HIGH);
ebcf0981 AC	85	writel(count, base + GOLDFISH_TTY_DATA_LEN);
	86	writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
	87	spin_unlock_irqrestore(&qtty->lock, irq_flags);
	88	tty_schedule_flip(&qtty->port);
666b7793 AH	89	return IRQ_HANDLED;
	90	}
	91
	92	static int goldfish_tty_activate(struct tty_port port, struct tty_struct tty)
	93	{
d78055dc A	94	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
d78055dc A	95	port);
666b7793 AH	96	writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD);
	97	return 0;
	98	}
	99
	100	static void goldfish_tty_shutdown(struct tty_port *port)
	101	{
d78055dc A	102	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
d78055dc A	103	port);
666b7793 AH	104	writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD);
	105	}
	106
d78055dc	107	static int goldfish_tty_open(struct tty_struct tty, struct file filp)
666b7793 AH	108	{
	109	struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
	110	return tty_port_open(&qtty->port, tty, filp);
	111	}
	112
d78055dc	113	static void goldfish_tty_close(struct tty_struct tty, struct file filp)
666b7793 AH	114	{
	115	tty_port_close(tty->port, tty, filp);
	116	}
	117
	118	static void goldfish_tty_hangup(struct tty_struct *tty)
	119	{
	120	tty_port_hangup(tty->port);
	121	}
	122
d78055dc A	123	static int goldfish_tty_write(struct tty_struct tty, const unsigned char buf,
d78055dc A	124	int count)
666b7793 AH	125	{
	126	goldfish_tty_do_write(tty->index, buf, count);
	127	return count;
	128	}
	129
	130	static int goldfish_tty_write_room(struct tty_struct *tty)
	131	{
	132	return 0x10000;
	133	}
	134
	135	static int goldfish_tty_chars_in_buffer(struct tty_struct *tty)
	136	{
	137	struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
	138	void __iomem *base = qtty->base;
	139	return readl(base + GOLDFISH_TTY_BYTES_READY);
	140	}
	141
d78055dc A	142	static void goldfish_tty_console_write(struct console co, const char b,
d78055dc A	143	unsigned count)
666b7793 AH	144	{
	145	goldfish_tty_do_write(co->index, b, count);
	146	}
	147
d78055dc A	148	static struct tty_driver goldfish_tty_console_device(struct console c,
d78055dc A	149	int *index)
666b7793 AH	150	{
	151	*index = c->index;
	152	return goldfish_tty_driver;
	153	}
	154
	155	static int goldfish_tty_console_setup(struct console co, char options)
	156	{
fda2b418	157	if ((unsigned)co->index >= goldfish_tty_line_count)
666b7793	158	return -ENODEV;
a4dc9236	159	if (!goldfish_ttys[co->index].base)
666b7793 AH	160	return -ENODEV;
	161	return 0;
	162	}
	163
04b757df	164	static const struct tty_port_operations goldfish_port_ops = {
666b7793 AH	165	.activate = goldfish_tty_activate,
	166	.shutdown = goldfish_tty_shutdown
	167	};
	168
d78055dc	169	static const struct tty_operations goldfish_tty_ops = {
666b7793 AH	170	.open = goldfish_tty_open,
	171	.close = goldfish_tty_close,
	172	.hangup = goldfish_tty_hangup,
	173	.write = goldfish_tty_write,
	174	.write_room = goldfish_tty_write_room,
	175	.chars_in_buffer = goldfish_tty_chars_in_buffer,
	176	};
	177
	178	static int goldfish_tty_create_driver(void)
	179	{
	180	int ret;
	181	struct tty_driver *tty;
	182
d78055dc A	183	goldfish_ttys = kzalloc(sizeof(goldfish_ttys)
	184	goldfish_tty_line_count, GFP_KERNEL);
	185	if (goldfish_ttys == NULL) {
666b7793 AH	186	ret = -ENOMEM;
	187	goto err_alloc_goldfish_ttys_failed;
	188	}
	189	tty = alloc_tty_driver(goldfish_tty_line_count);
d78055dc	190	if (tty == NULL) {
666b7793 AH	191	ret = -ENOMEM;
	192	goto err_alloc_tty_driver_failed;
	193	}
	194	tty->driver_name = "goldfish";
	195	tty->name = "ttyGF";
	196	tty->type = TTY_DRIVER_TYPE_SERIAL;
	197	tty->subtype = SERIAL_TYPE_NORMAL;
	198	tty->init_termios = tty_std_termios;
d78055dc A	199	tty->flags = TTY_DRIVER_RESET_TERMIOS \| TTY_DRIVER_REAL_RAW \|
d78055dc A	200	TTY_DRIVER_DYNAMIC_DEV;
666b7793 AH	201	tty_set_operations(tty, &goldfish_tty_ops);
666b7793 AH	202	ret = tty_register_driver(tty);
d78055dc	203	if (ret)
666b7793 AH	204	goto err_tty_register_driver_failed;
	205
	206	goldfish_tty_driver = tty;
	207	return 0;
	208
	209	err_tty_register_driver_failed:
	210	put_tty_driver(tty);
	211	err_alloc_tty_driver_failed:
	212	kfree(goldfish_ttys);
	213	goldfish_ttys = NULL;
	214	err_alloc_goldfish_ttys_failed:
	215	return ret;
	216	}
	217
	218	static void goldfish_tty_delete_driver(void)
	219	{
	220	tty_unregister_driver(goldfish_tty_driver);
	221	put_tty_driver(goldfish_tty_driver);
	222	goldfish_tty_driver = NULL;
	223	kfree(goldfish_ttys);
	224	goldfish_ttys = NULL;
	225	}
	226
	227	static int goldfish_tty_probe(struct platform_device *pdev)
	228	{
	229	struct goldfish_tty *qtty;
	230	int ret = -EINVAL;
666b7793 AH	231	struct resource *r;
	232	struct device *ttydev;
	233	void __iomem *base;
	234	u32 irq;
465893e1	235	unsigned int line;
666b7793 AH	236
666b7793 AH	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
666b7793	251	mutex_lock(&goldfish_tty_lock);
465893e1 GH	252
	253	if (pdev->id == PLATFORM_DEVID_NONE)
	254	line = goldfish_tty_current_line_count;
	255	else
	256	line = pdev->id;
	257
	258	if (line >= goldfish_tty_line_count)
	259	goto err_create_driver_failed;
	260
d78055dc	261	if (goldfish_tty_current_line_count == 0) {
666b7793	262	ret = goldfish_tty_create_driver();
d78055dc	263	if (ret)
666b7793 AH	264	goto err_create_driver_failed;
	265	}
	266	goldfish_tty_current_line_count++;
	267
465893e1	268	qtty = &goldfish_ttys[line];
666b7793 AH	269	spin_lock_init(&qtty->lock);
	270	tty_port_init(&qtty->port);
	271	qtty->port.ops = &goldfish_port_ops;
	272	qtty->base = base;
	273	qtty->irq = irq;
	274
	275	writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD);
	276
d78055dc	277	ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED,
465893e1	278	"goldfish_tty", qtty);
d78055dc	279	if (ret)
666b7793 AH	280	goto err_request_irq_failed;
	281
	282
	283	ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,
465893e1	284	line, &pdev->dev);
d78055dc	285	if (IS_ERR(ttydev)) {
666b7793 AH	286	ret = PTR_ERR(ttydev);
	287	goto err_tty_register_device_failed;
	288	}
	289
	290	strcpy(qtty->console.name, "ttyGF");
	291	qtty->console.write = goldfish_tty_console_write;
	292	qtty->console.device = goldfish_tty_console_device;
	293	qtty->console.setup = goldfish_tty_console_setup;
	294	qtty->console.flags = CON_PRINTBUFFER;
465893e1	295	qtty->console.index = line;
666b7793	296	register_console(&qtty->console);
465893e1	297	platform_set_drvdata(pdev, qtty);
666b7793 AH	298
	299	mutex_unlock(&goldfish_tty_lock);
	300	return 0;
	301
666b7793 AH	302	err_tty_register_device_failed:
	303	free_irq(irq, pdev);
	304	err_request_irq_failed:
	305	goldfish_tty_current_line_count--;
d78055dc	306	if (goldfish_tty_current_line_count == 0)
666b7793 AH	307	goldfish_tty_delete_driver();
	308	err_create_driver_failed:
	309	mutex_unlock(&goldfish_tty_lock);
	310	err_unmap:
	311	iounmap(base);
	312	return ret;
	313	}
	314
	315	static int goldfish_tty_remove(struct platform_device *pdev)
	316	{
465893e1	317	struct goldfish_tty *qtty = platform_get_drvdata(pdev);
666b7793 AH	318
	319	mutex_lock(&goldfish_tty_lock);
	320
666b7793	321	unregister_console(&qtty->console);
465893e1	322	tty_unregister_device(goldfish_tty_driver, qtty->console.index);
666b7793	323	iounmap(qtty->base);
a4dc9236	324	qtty->base = NULL;
666b7793 AH	325	free_irq(qtty->irq, pdev);
666b7793 AH	326	goldfish_tty_current_line_count--;
d78055dc	327	if (goldfish_tty_current_line_count == 0)
666b7793 AH	328	goldfish_tty_delete_driver();
	329	mutex_unlock(&goldfish_tty_lock);
	330	return 0;
	331	}
	332
9b883eea MD	333	static const struct of_device_id goldfish_tty_of_match[] = {
	334	{ .compatible = "google,goldfish-tty", },
	335	{},
	336	};
	337
	338	MODULE_DEVICE_TABLE(of, goldfish_tty_of_match);
	339
666b7793 AH	340	static struct platform_driver goldfish_tty_platform_driver = {
	341	.probe = goldfish_tty_probe,
	342	.remove = goldfish_tty_remove,
	343	.driver = {
9b883eea MD	344	.name = "goldfish_tty",
9b883eea MD	345	.of_match_table = goldfish_tty_of_match,
666b7793 AH	346	}
	347	};
	348
	349	module_platform_driver(goldfish_tty_platform_driver);
	350
	351	MODULE_LICENSE("GPL v2");