[mirror_ubuntu-bionic-kernel.git] / drivers / input / serio / serio_raw.c

/*
 * Raw serio device providing access to a raw byte stream from underlying
 * serio port. Closely emulates behavior of pre-2.6 /dev/psaux device
 *
 * Copyright (c) 2004 Dmitry Torokhov
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/kref.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/serio.h>
#include <linux/init.h>
#include <linux/major.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/wait.h>
#include <linux/mutex.h>

#define DRIVER_DESC	"Raw serio driver"

MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

#define SERIO_RAW_QUEUE_LEN	64
struct serio_raw {
	unsigned char queue[SERIO_RAW_QUEUE_LEN];
	unsigned int tail, head;

	char name[16];
	struct kref kref;
	struct serio *serio;
	struct miscdevice dev;
	wait_queue_head_t wait;
	struct list_head client_list;
	struct list_head node;
	bool dead;
};

struct serio_raw_client {
	struct fasync_struct *fasync;
	struct serio_raw *serio_raw;
	struct list_head node;
};

static DEFINE_MUTEX(serio_raw_mutex);
static LIST_HEAD(serio_raw_list);

/*********************************************************************
 *             Interface with userspace (file operations)            *
 *********************************************************************/

static int serio_raw_fasync(int fd, struct file *file, int on)
{
	struct serio_raw_client *client = file->private_data;

	return fasync_helper(fd, file, on, &client->fasync);
}

static struct serio_raw *serio_raw_locate(int minor)
{
	struct serio_raw *serio_raw;

	list_for_each_entry(serio_raw, &serio_raw_list, node) {
		if (serio_raw->dev.minor == minor)
			return serio_raw;
	}

	return NULL;
}

static int serio_raw_open(struct inode *inode, struct file *file)
{
	struct serio_raw *serio_raw;
	struct serio_raw_client *client;
	int retval;

	retval = mutex_lock_interruptible(&serio_raw_mutex);
	if (retval)
		return retval;

	serio_raw = serio_raw_locate(iminor(inode));
	if (!serio_raw) {
		retval = -ENODEV;
		goto out;
	}

	if (serio_raw->dead) {
		retval = -ENODEV;
		goto out;
	}

	client = kzalloc(sizeof(struct serio_raw_client), GFP_KERNEL);
	if (!client) {
		retval = -ENOMEM;
		goto out;
	}

	client->serio_raw = serio_raw;
	file->private_data = client;

	kref_get(&serio_raw->kref);

	serio_pause_rx(serio_raw->serio);
	list_add_tail(&client->node, &serio_raw->client_list);
	serio_continue_rx(serio_raw->serio);

out:
	mutex_unlock(&serio_raw_mutex);
	return retval;
}

static void serio_raw_free(struct kref *kref)
{
	struct serio_raw *serio_raw =
			container_of(kref, struct serio_raw, kref);

	put_device(&serio_raw->serio->dev);
	kfree(serio_raw);
}

static int serio_raw_release(struct inode *inode, struct file *file)
{
	struct serio_raw_client *client = file->private_data;
	struct serio_raw *serio_raw = client->serio_raw;

	serio_pause_rx(serio_raw->serio);
	list_del(&client->node);
	serio_continue_rx(serio_raw->serio);

	kfree(client);

	kref_put(&serio_raw->kref, serio_raw_free);

	return 0;
}

static bool serio_raw_fetch_byte(struct serio_raw *serio_raw, char *c)
{
	bool empty;

	serio_pause_rx(serio_raw->serio);

	empty = serio_raw->head == serio_raw->tail;
	if (!empty) {
		*c = serio_raw->queue[serio_raw->tail];
		serio_raw->tail = (serio_raw->tail + 1) % SERIO_RAW_QUEUE_LEN;
	}

	serio_continue_rx(serio_raw->serio);

	return !empty;
}

static ssize_t serio_raw_read(struct file *file, char __user *buffer,
			      size_t count, loff_t *ppos)
{
	struct serio_raw_client *client = file->private_data;
	struct serio_raw *serio_raw = client->serio_raw;
	char uninitialized_var(c);
	ssize_t read = 0;
	int retval;

	if (serio_raw->dead)
		return -ENODEV;

	if (serio_raw->head == serio_raw->tail && (file->f_flags & O_NONBLOCK))
		return -EAGAIN;

	retval = wait_event_interruptible(serio_raw->wait,
			serio_raw->head != serio_raw->tail || serio_raw->dead);
	if (retval)
		return retval;

	if (serio_raw->dead)
		return -ENODEV;

	while (read < count && serio_raw_fetch_byte(serio_raw, &c)) {
		if (put_user(c, buffer++)) {
			retval = -EFAULT;
			break;
		}
		read++;
	}

	return read ?: retval;
}

static ssize_t serio_raw_write(struct file *file, const char __user *buffer,
			       size_t count, loff_t *ppos)
{
	struct serio_raw_client *client = file->private_data;
	struct serio_raw *serio_raw = client->serio_raw;
	ssize_t written = 0;
	int retval;
	unsigned char c;

	retval = mutex_lock_interruptible(&serio_raw_mutex);
	if (retval)
		return retval;

	if (serio_raw->dead) {
		retval = -ENODEV;
		goto out;
	}

	if (count > 32)
		count = 32;

	while (count--) {
		if (get_user(c, buffer++)) {
			retval = -EFAULT;
			goto out;
		}
		if (serio_write(serio_raw->serio, c)) {
			retval = -EIO;
			goto out;
		}
		written++;
	}

out:
	mutex_unlock(&serio_raw_mutex);
	return written ?: retval;
}

static unsigned int serio_raw_poll(struct file *file, poll_table *wait)
{
	struct serio_raw_client *client = file->private_data;
	struct serio_raw *serio_raw = client->serio_raw;
	unsigned int mask;

	poll_wait(file, &serio_raw->wait, wait);

	mask = serio_raw->dead ? POLLHUP | POLLERR : POLLOUT | POLLWRNORM;
	if (serio_raw->head != serio_raw->tail)
		mask |= POLLIN | POLLRDNORM;

	return mask;
}

static const struct file_operations serio_raw_fops = {
	.owner		= THIS_MODULE,
	.open		= serio_raw_open,
	.release	= serio_raw_release,
	.read		= serio_raw_read,
	.write		= serio_raw_write,
	.poll		= serio_raw_poll,
	.fasync		= serio_raw_fasync,
	.llseek		= noop_llseek,
};


/*********************************************************************
 *                   Interface with serio port                       *
 *********************************************************************/

static irqreturn_t serio_raw_interrupt(struct serio *serio, unsigned char data,
					unsigned int dfl)
{
	struct serio_raw *serio_raw = serio_get_drvdata(serio);
	struct serio_raw_client *client;
	unsigned int head = serio_raw->head;

	/* we are holding serio->lock here so we are protected */
	serio_raw->queue[head] = data;
	head = (head + 1) % SERIO_RAW_QUEUE_LEN;
	if (likely(head != serio_raw->tail)) {
		serio_raw->head = head;
		list_for_each_entry(client, &serio_raw->client_list, node)
			kill_fasync(&client->fasync, SIGIO, POLL_IN);
		wake_up_interruptible(&serio_raw->wait);
	}

	return IRQ_HANDLED;
}

static int serio_raw_connect(struct serio *serio, struct serio_driver *drv)
{
	static atomic_t serio_raw_no = ATOMIC_INIT(0);
	struct serio_raw *serio_raw;
	int err;

	serio_raw = kzalloc(sizeof(struct serio_raw), GFP_KERNEL);
	if (!serio_raw) {
		dev_dbg(&serio->dev, "can't allocate memory for a device\n");
		return -ENOMEM;
	}

	snprintf(serio_raw->name, sizeof(serio_raw->name),
		 "serio_raw%ld", (long)atomic_inc_return(&serio_raw_no) - 1);
	kref_init(&serio_raw->kref);
	INIT_LIST_HEAD(&serio_raw->client_list);
	init_waitqueue_head(&serio_raw->wait);

	serio_raw->serio = serio;
	get_device(&serio->dev);

	serio_set_drvdata(serio, serio_raw);

	err = serio_open(serio, drv);
	if (err)
		goto err_free;

	err = mutex_lock_killable(&serio_raw_mutex);
	if (err)
		goto err_close;

	list_add_tail(&serio_raw->node, &serio_raw_list);
	mutex_unlock(&serio_raw_mutex);

	serio_raw->dev.minor = PSMOUSE_MINOR;
	serio_raw->dev.name = serio_raw->name;
	serio_raw->dev.parent = &serio->dev;
	serio_raw->dev.fops = &serio_raw_fops;

	err = misc_register(&serio_raw->dev);
	if (err) {
		serio_raw->dev.minor = MISC_DYNAMIC_MINOR;
		err = misc_register(&serio_raw->dev);
	}

	if (err) {
		dev_err(&serio->dev,
			"failed to register raw access device for %s\n",
			serio->phys);
		goto err_unlink;
	}

	dev_info(&serio->dev, "raw access enabled on %s (%s, minor %d)\n",
		 serio->phys, serio_raw->name, serio_raw->dev.minor);
	return 0;

err_unlink:
	list_del_init(&serio_raw->node);
err_close:
	serio_close(serio);
err_free:
	serio_set_drvdata(serio, NULL);
	kref_put(&serio_raw->kref, serio_raw_free);
	return err;
}

static int serio_raw_reconnect(struct serio *serio)
{
	struct serio_raw *serio_raw = serio_get_drvdata(serio);
	struct serio_driver *drv = serio->drv;

	if (!drv || !serio_raw) {
		dev_dbg(&serio->dev,
			"reconnect request, but serio is disconnected, ignoring...\n");
		return -1;
	}

	/*
	 * Nothing needs to be done here, we just need this method to
	 * keep the same device.
	 */
	return 0;
}

/*
 * Wake up users waiting for IO so they can disconnect from
 * dead device.
 */
static void serio_raw_hangup(struct serio_raw *serio_raw)
{
	struct serio_raw_client *client;

	serio_pause_rx(serio_raw->serio);
	list_for_each_entry(client, &serio_raw->client_list, node)
		kill_fasync(&client->fasync, SIGIO, POLL_HUP);
	serio_continue_rx(serio_raw->serio);

	wake_up_interruptible(&serio_raw->wait);
}


static void serio_raw_disconnect(struct serio *serio)
{
	struct serio_raw *serio_raw = serio_get_drvdata(serio);

	misc_deregister(&serio_raw->dev);

	mutex_lock(&serio_raw_mutex);
	serio_raw->dead = true;
	list_del_init(&serio_raw->node);
	mutex_unlock(&serio_raw_mutex);

	serio_raw_hangup(serio_raw);

	serio_close(serio);
	kref_put(&serio_raw->kref, serio_raw_free);

	serio_set_drvdata(serio, NULL);
}

static struct serio_device_id serio_raw_serio_ids[] = {
	{
		.type	= SERIO_8042,
		.proto	= SERIO_ANY,
		.id	= SERIO_ANY,
		.extra	= SERIO_ANY,
	},
	{
		.type	= SERIO_8042_XL,
		.proto	= SERIO_ANY,
		.id	= SERIO_ANY,
		.extra	= SERIO_ANY,
	},
	{ 0 }
};

MODULE_DEVICE_TABLE(serio, serio_raw_serio_ids);

static struct serio_driver serio_raw_drv = {
	.driver		= {
		.name	= "serio_raw",
	},
	.description	= DRIVER_DESC,
	.id_table	= serio_raw_serio_ids,
	.interrupt	= serio_raw_interrupt,
	.connect	= serio_raw_connect,
	.reconnect	= serio_raw_reconnect,
	.disconnect	= serio_raw_disconnect,
	.manual_bind	= true,
};

static int __init serio_raw_init(void)
{
	return serio_register_driver(&serio_raw_drv);
}

static void __exit serio_raw_exit(void)
{
	serio_unregister_driver(&serio_raw_drv);
}

module_init(serio_raw_init);
module_exit(serio_raw_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Raw serio device providing access to a raw byte stream from underlying
	3	* serio port. Closely emulates behavior of pre-2.6 /dev/psaux device
	4	*
	5	* Copyright (c) 2004 Dmitry Torokhov
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License version 2 as published by
	9	* the Free Software Foundation.
	10	*/
	11
ba538cd2	12	#include <linux/kref.h>
d43c36dc	13	#include <linux/sched.h>
1da177e4 LT	14	#include <linux/slab.h>
	15	#include <linux/poll.h>
	16	#include <linux/module.h>
	17	#include <linux/serio.h>
	18	#include <linux/init.h>
	19	#include <linux/major.h>
	20	#include <linux/device.h>
1da177e4 LT	21	#include <linux/miscdevice.h>
1da177e4 LT	22	#include <linux/wait.h>
c4e32e9f	23	#include <linux/mutex.h>
1da177e4 LT	24
	25	#define DRIVER_DESC "Raw serio driver"
	26
	27	MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
	28	MODULE_DESCRIPTION(DRIVER_DESC);
	29	MODULE_LICENSE("GPL");
	30
	31	#define SERIO_RAW_QUEUE_LEN 64
	32	struct serio_raw {
	33	unsigned char queue[SERIO_RAW_QUEUE_LEN];
	34	unsigned int tail, head;
	35
	36	char name[16];
ba538cd2	37	struct kref kref;
1da177e4 LT	38	struct serio *serio;
	39	struct miscdevice dev;
	40	wait_queue_head_t wait;
7c5bbb2e	41	struct list_head client_list;
1da177e4	42	struct list_head node;
85f5b35d	43	bool dead;
1da177e4 LT	44	};
1da177e4 LT	45
7c5bbb2e	46	struct serio_raw_client {
1da177e4 LT	47	struct fasync_struct *fasync;
	48	struct serio_raw *serio_raw;
	49	struct list_head node;
	50	};
	51
c4e32e9f	52	static DEFINE_MUTEX(serio_raw_mutex);
1da177e4	53	static LIST_HEAD(serio_raw_list);
1da177e4 LT	54
	55	/*********************************************************************
	56	* Interface with userspace (file operations) *
	57	*********************************************************************/
	58
	59	static int serio_raw_fasync(int fd, struct file *file, int on)
	60	{
7c5bbb2e	61	struct serio_raw_client *client = file->private_data;
1da177e4	62
7c5bbb2e	63	return fasync_helper(fd, file, on, &client->fasync);
1da177e4 LT	64	}
	65
	66	static struct serio_raw *serio_raw_locate(int minor)
	67	{
	68	struct serio_raw *serio_raw;
	69
	70	list_for_each_entry(serio_raw, &serio_raw_list, node) {
	71	if (serio_raw->dev.minor == minor)
	72	return serio_raw;
	73	}
	74
	75	return NULL;
	76	}
	77
	78	static int serio_raw_open(struct inode inode, struct file file)
	79	{
	80	struct serio_raw *serio_raw;
7c5bbb2e DT	81	struct serio_raw_client *client;
7c5bbb2e DT	82	int retval;
1da177e4	83
c4e32e9f	84	retval = mutex_lock_interruptible(&serio_raw_mutex);
1da177e4	85	if (retval)
77554b4d	86	return retval;
1da177e4	87
77554b4d TLSC	88	serio_raw = serio_raw_locate(iminor(inode));
77554b4d TLSC	89	if (!serio_raw) {
1da177e4 LT	90	retval = -ENODEV;
	91	goto out;
	92	}
	93
85f5b35d	94	if (serio_raw->dead) {
1da177e4 LT	95	retval = -ENODEV;
	96	goto out;
	97	}
	98
7c5bbb2e DT	99	client = kzalloc(sizeof(struct serio_raw_client), GFP_KERNEL);
7c5bbb2e DT	100	if (!client) {
1da177e4 LT	101	retval = -ENOMEM;
	102	goto out;
	103	}
	104
7c5bbb2e DT	105	client->serio_raw = serio_raw;
7c5bbb2e DT	106	file->private_data = client;
1da177e4	107
ba538cd2	108	kref_get(&serio_raw->kref);
843e784a DT	109
843e784a DT	110	serio_pause_rx(serio_raw->serio);
7c5bbb2e	111	list_add_tail(&client->node, &serio_raw->client_list);
843e784a	112	serio_continue_rx(serio_raw->serio);
1da177e4 LT	113
1da177e4 LT	114	out:
c4e32e9f	115	mutex_unlock(&serio_raw_mutex);
1da177e4 LT	116	return retval;
	117	}
	118
550eca7c	119	static void serio_raw_free(struct kref *kref)
1da177e4	120	{
ba538cd2 DT	121	struct serio_raw *serio_raw =
ba538cd2 DT	122	container_of(kref, struct serio_raw, kref);
1da177e4	123
85f5b35d	124	put_device(&serio_raw->serio->dev);
ba538cd2	125	kfree(serio_raw);
1da177e4 LT	126	}
	127
	128	static int serio_raw_release(struct inode inode, struct file file)
	129	{
7c5bbb2e DT	130	struct serio_raw_client *client = file->private_data;
7c5bbb2e DT	131	struct serio_raw *serio_raw = client->serio_raw;
1da177e4	132
550eca7c DT	133	serio_pause_rx(serio_raw->serio);
	134	list_del(&client->node);
	135	serio_continue_rx(serio_raw->serio);
1da177e4	136
550eca7c DT	137	kfree(client);
	138
	139	kref_put(&serio_raw->kref, serio_raw_free);
1da177e4	140
1da177e4 LT	141	return 0;
	142	}
	143
8c31eb01	144	static bool serio_raw_fetch_byte(struct serio_raw serio_raw, char c)
1da177e4	145	{
8c31eb01	146	bool empty;
1da177e4	147
843e784a	148	serio_pause_rx(serio_raw->serio);
1da177e4 LT	149
	150	empty = serio_raw->head == serio_raw->tail;
	151	if (!empty) {
	152	*c = serio_raw->queue[serio_raw->tail];
	153	serio_raw->tail = (serio_raw->tail + 1) % SERIO_RAW_QUEUE_LEN;
	154	}
	155
843e784a	156	serio_continue_rx(serio_raw->serio);
1da177e4 LT	157
	158	return !empty;
	159	}
	160
15a564d8 DT	161	static ssize_t serio_raw_read(struct file file, char __user buffer,
15a564d8 DT	162	size_t count, loff_t *ppos)
1da177e4	163	{
7c5bbb2e DT	164	struct serio_raw_client *client = file->private_data;
7c5bbb2e DT	165	struct serio_raw *serio_raw = client->serio_raw;
4f179f71	166	char uninitialized_var(c);
7a0a27d2 CLC	167	ssize_t read = 0;
7a0a27d2 CLC	168	int retval;
1da177e4	169
85f5b35d	170	if (serio_raw->dead)
1da177e4 LT	171	return -ENODEV;
	172
	173	if (serio_raw->head == serio_raw->tail && (file->f_flags & O_NONBLOCK))
	174	return -EAGAIN;
	175
7c5bbb2e	176	retval = wait_event_interruptible(serio_raw->wait,
85f5b35d	177	serio_raw->head != serio_raw->tail \|\| serio_raw->dead);
1da177e4 LT	178	if (retval)
	179	return retval;
	180
85f5b35d	181	if (serio_raw->dead)
1da177e4 LT	182	return -ENODEV;
1da177e4 LT	183
7a0a27d2 CLC	184	while (read < count && serio_raw_fetch_byte(serio_raw, &c)) {
	185	if (put_user(c, buffer++)) {
	186	retval = -EFAULT;
	187	break;
	188	}
	189	read++;
1da177e4 LT	190	}
1da177e4 LT	191
7a0a27d2	192	return read ?: retval;
1da177e4 LT	193	}
1da177e4 LT	194
15a564d8 DT	195	static ssize_t serio_raw_write(struct file file, const char __user buffer,
15a564d8 DT	196	size_t count, loff_t *ppos)
1da177e4	197	{
7c5bbb2e DT	198	struct serio_raw_client *client = file->private_data;
7c5bbb2e DT	199	struct serio_raw *serio_raw = client->serio_raw;
1da177e4 LT	200	ssize_t written = 0;
	201	int retval;
	202	unsigned char c;
	203
c4e32e9f	204	retval = mutex_lock_interruptible(&serio_raw_mutex);
1da177e4 LT	205	if (retval)
	206	return retval;
	207
85f5b35d	208	if (serio_raw->dead) {
1da177e4 LT	209	retval = -ENODEV;
	210	goto out;
	211	}
	212
	213	if (count > 32)
	214	count = 32;
	215
	216	while (count--) {
	217	if (get_user(c, buffer++)) {
	218	retval = -EFAULT;
	219	goto out;
	220	}
7c5bbb2e	221	if (serio_write(serio_raw->serio, c)) {
1da177e4 LT	222	retval = -EIO;
	223	goto out;
	224	}
	225	written++;
d89c9bcb	226	}
1da177e4 LT	227
1da177e4 LT	228	out:
c4e32e9f	229	mutex_unlock(&serio_raw_mutex);
4fa07711	230	return written ?: retval;
1da177e4 LT	231	}
	232
	233	static unsigned int serio_raw_poll(struct file file, poll_table wait)
	234	{
7c5bbb2e DT	235	struct serio_raw_client *client = file->private_data;
7c5bbb2e DT	236	struct serio_raw *serio_raw = client->serio_raw;
8c1c10d5	237	unsigned int mask;
1da177e4	238
7c5bbb2e	239	poll_wait(file, &serio_raw->wait, wait);
1da177e4	240
8c1c10d5	241	mask = serio_raw->dead ? POLLHUP \| POLLERR : POLLOUT \| POLLWRNORM;
7c5bbb2e	242	if (serio_raw->head != serio_raw->tail)
0c62fbf6	243	mask \|= POLLIN \| POLLRDNORM;
1da177e4	244
0c62fbf6	245	return mask;
1da177e4 LT	246	}
1da177e4 LT	247
2b8693c0	248	static const struct file_operations serio_raw_fops = {
7c5bbb2e DT	249	.owner = THIS_MODULE,
	250	.open = serio_raw_open,
	251	.release = serio_raw_release,
	252	.read = serio_raw_read,
	253	.write = serio_raw_write,
	254	.poll = serio_raw_poll,
	255	.fasync = serio_raw_fasync,
	256	.llseek = noop_llseek,
1da177e4 LT	257	};
	258
	259
	260	/*********************************************************************
15a564d8	261	* Interface with serio port *
1da177e4 LT	262	*********************************************************************/
	263
	264	static irqreturn_t serio_raw_interrupt(struct serio *serio, unsigned char data,
7d12e780	265	unsigned int dfl)
1da177e4 LT	266	{
1da177e4 LT	267	struct serio_raw *serio_raw = serio_get_drvdata(serio);
7c5bbb2e	268	struct serio_raw_client *client;
1da177e4 LT	269	unsigned int head = serio_raw->head;
1da177e4 LT	270
7c5bbb2e	271	/* we are holding serio->lock here so we are protected */
1da177e4 LT	272	serio_raw->queue[head] = data;
	273	head = (head + 1) % SERIO_RAW_QUEUE_LEN;
	274	if (likely(head != serio_raw->tail)) {
	275	serio_raw->head = head;
7c5bbb2e DT	276	list_for_each_entry(client, &serio_raw->client_list, node)
7c5bbb2e DT	277	kill_fasync(&client->fasync, SIGIO, POLL_IN);
1da177e4 LT	278	wake_up_interruptible(&serio_raw->wait);
	279	}
	280
	281	return IRQ_HANDLED;
	282	}
	283
	284	static int serio_raw_connect(struct serio serio, struct serio_driver drv)
	285	{
550eca7c	286	static atomic_t serio_raw_no = ATOMIC_INIT(0);
1da177e4 LT	287	struct serio_raw *serio_raw;
	288	int err;
	289
15a564d8 DT	290	serio_raw = kzalloc(sizeof(struct serio_raw), GFP_KERNEL);
15a564d8 DT	291	if (!serio_raw) {
8d928477	292	dev_dbg(&serio->dev, "can't allocate memory for a device\n");
1da177e4 LT	293	return -ENOMEM;
	294	}
	295
15a564d8	296	snprintf(serio_raw->name, sizeof(serio_raw->name),
550eca7c	297	"serio_raw%ld", (long)atomic_inc_return(&serio_raw_no) - 1);
ba538cd2	298	kref_init(&serio_raw->kref);
7c5bbb2e	299	INIT_LIST_HEAD(&serio_raw->client_list);
1da177e4 LT	300	init_waitqueue_head(&serio_raw->wait);
1da177e4 LT	301
85f5b35d DT	302	serio_raw->serio = serio;
	303	get_device(&serio->dev);
	304
1da177e4 LT	305	serio_set_drvdata(serio, serio_raw);
	306
	307	err = serio_open(serio, drv);
	308	if (err)
550eca7c DT	309	goto err_free;
	310
	311	err = mutex_lock_killable(&serio_raw_mutex);
	312	if (err)
	313	goto err_close;
1da177e4 LT	314
1da177e4 LT	315	list_add_tail(&serio_raw->node, &serio_raw_list);
550eca7c	316	mutex_unlock(&serio_raw_mutex);
1da177e4 LT	317
	318	serio_raw->dev.minor = PSMOUSE_MINOR;
	319	serio_raw->dev.name = serio_raw->name;
94fbcded	320	serio_raw->dev.parent = &serio->dev;
1da177e4 LT	321	serio_raw->dev.fops = &serio_raw_fops;
	322
	323	err = misc_register(&serio_raw->dev);
	324	if (err) {
	325	serio_raw->dev.minor = MISC_DYNAMIC_MINOR;
	326	err = misc_register(&serio_raw->dev);
	327	}
	328
	329	if (err) {
8d928477 DT	330	dev_err(&serio->dev,
8d928477 DT	331	"failed to register raw access device for %s\n",
1da177e4	332	serio->phys);
550eca7c	333	goto err_unlink;
1da177e4 LT	334	}
1da177e4 LT	335
8d928477 DT	336	dev_info(&serio->dev, "raw access enabled on %s (%s, minor %d)\n",
8d928477 DT	337	serio->phys, serio_raw->name, serio_raw->dev.minor);
550eca7c	338	return 0;
1da177e4	339
550eca7c	340	err_unlink:
1da177e4	341	list_del_init(&serio_raw->node);
550eca7c DT	342	err_close:
	343	serio_close(serio);
	344	err_free:
1da177e4	345	serio_set_drvdata(serio, NULL);
550eca7c	346	kref_put(&serio_raw->kref, serio_raw_free);
1da177e4 LT	347	return err;
	348	}
	349
	350	static int serio_raw_reconnect(struct serio *serio)
	351	{
	352	struct serio_raw *serio_raw = serio_get_drvdata(serio);
	353	struct serio_driver *drv = serio->drv;
	354
	355	if (!drv \|\| !serio_raw) {
8d928477 DT	356	dev_dbg(&serio->dev,
8d928477 DT	357	"reconnect request, but serio is disconnected, ignoring...\n");
1da177e4 LT	358	return -1;
	359	}
	360
	361	/*
	362	* Nothing needs to be done here, we just need this method to
	363	* keep the same device.
	364	*/
	365	return 0;
	366	}
	367
8c1c10d5 DT	368	/*
	369	* Wake up users waiting for IO so they can disconnect from
	370	* dead device.
	371	*/
	372	static void serio_raw_hangup(struct serio_raw *serio_raw)
	373	{
	374	struct serio_raw_client *client;
	375
	376	serio_pause_rx(serio_raw->serio);
	377	list_for_each_entry(client, &serio_raw->client_list, node)
	378	kill_fasync(&client->fasync, SIGIO, POLL_HUP);
	379	serio_continue_rx(serio_raw->serio);
	380
	381	wake_up_interruptible(&serio_raw->wait);
	382	}
	383
	384
1da177e4 LT	385	static void serio_raw_disconnect(struct serio *serio)
1da177e4 LT	386	{
8c1c10d5	387	struct serio_raw *serio_raw = serio_get_drvdata(serio);
1da177e4	388
550eca7c	389	misc_deregister(&serio_raw->dev);
1da177e4	390
550eca7c	391	mutex_lock(&serio_raw_mutex);
85f5b35d	392	serio_raw->dead = true;
550eca7c DT	393	list_del_init(&serio_raw->node);
	394	mutex_unlock(&serio_raw_mutex);
	395
8c1c10d5	396	serio_raw_hangup(serio_raw);
1da177e4	397
550eca7c DT	398	serio_close(serio);
550eca7c DT	399	kref_put(&serio_raw->kref, serio_raw_free);
8c1c10d5 DT	400
8c1c10d5 DT	401	serio_set_drvdata(serio, NULL);
1da177e4 LT	402	}
	403
	404	static struct serio_device_id serio_raw_serio_ids[] = {
	405	{
	406	.type = SERIO_8042,
	407	.proto = SERIO_ANY,
	408	.id = SERIO_ANY,
	409	.extra = SERIO_ANY,
	410	},
d19497e2 NV	411	{
	412	.type = SERIO_8042_XL,
	413	.proto = SERIO_ANY,
	414	.id = SERIO_ANY,
	415	.extra = SERIO_ANY,
	416	},
1da177e4 LT	417	{ 0 }
	418	};
	419
	420	MODULE_DEVICE_TABLE(serio, serio_raw_serio_ids);
	421
	422	static struct serio_driver serio_raw_drv = {
	423	.driver = {
	424	.name = "serio_raw",
	425	},
	426	.description = DRIVER_DESC,
	427	.id_table = serio_raw_serio_ids,
	428	.interrupt = serio_raw_interrupt,
	429	.connect = serio_raw_connect,
	430	.reconnect = serio_raw_reconnect,
	431	.disconnect = serio_raw_disconnect,
8c31eb01	432	.manual_bind = true,
1da177e4 LT	433	};
	434
	435	static int __init serio_raw_init(void)
	436	{
153a9df0	437	return serio_register_driver(&serio_raw_drv);
1da177e4 LT	438	}
	439
	440	static void __exit serio_raw_exit(void)
	441	{
	442	serio_unregister_driver(&serio_raw_drv);
	443	}
	444
	445	module_init(serio_raw_init);
	446	module_exit(serio_raw_exit);