[mirror_ubuntu-artful-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/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 error;

	for (;;) {
		if (serio_raw->dead)
			return -ENODEV;

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

		if (count == 0)
			break;

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

		if (read)
			break;

		if (!(file->f_flags & O_NONBLOCK)) {
			error = wait_event_interruptible(serio_raw->wait,
					serio_raw->head != serio_raw->tail ||
					serio_raw->dead);
			if (error)
				return error;
		}
	}

	return read;
}

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;
	int retval = 0;
	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)) {
			/* Either signal error or partial write */
			if (retval == 0)
				retval = -EIO;
			goto out;
		}

		retval++;
	}

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

module_serio_driver(serio_raw_drv);
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>
1da177e4 LT	18	#include <linux/major.h>
1da177e4 LT	19	#include <linux/device.h>
1da177e4 LT	20	#include <linux/miscdevice.h>
1da177e4 LT	21	#include <linux/wait.h>
c4e32e9f	22	#include <linux/mutex.h>
1da177e4 LT	23
	24	#define DRIVER_DESC "Raw serio driver"
	25
	26	MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
	27	MODULE_DESCRIPTION(DRIVER_DESC);
	28	MODULE_LICENSE("GPL");
	29
	30	#define SERIO_RAW_QUEUE_LEN 64
	31	struct serio_raw {
	32	unsigned char queue[SERIO_RAW_QUEUE_LEN];
	33	unsigned int tail, head;
	34
	35	char name[16];
ba538cd2	36	struct kref kref;
1da177e4 LT	37	struct serio *serio;
	38	struct miscdevice dev;
	39	wait_queue_head_t wait;
7c5bbb2e	40	struct list_head client_list;
1da177e4	41	struct list_head node;
85f5b35d	42	bool dead;
1da177e4 LT	43	};
1da177e4 LT	44
7c5bbb2e	45	struct serio_raw_client {
1da177e4 LT	46	struct fasync_struct *fasync;
	47	struct serio_raw *serio_raw;
	48	struct list_head node;
	49	};
	50
c4e32e9f	51	static DEFINE_MUTEX(serio_raw_mutex);
1da177e4	52	static LIST_HEAD(serio_raw_list);
1da177e4 LT	53
	54	/*********************************************************************
	55	* Interface with userspace (file operations) *
	56	*********************************************************************/
	57
	58	static int serio_raw_fasync(int fd, struct file *file, int on)
	59	{
7c5bbb2e	60	struct serio_raw_client *client = file->private_data;
1da177e4	61
7c5bbb2e	62	return fasync_helper(fd, file, on, &client->fasync);
1da177e4 LT	63	}
	64
	65	static struct serio_raw *serio_raw_locate(int minor)
	66	{
	67	struct serio_raw *serio_raw;
	68
	69	list_for_each_entry(serio_raw, &serio_raw_list, node) {
	70	if (serio_raw->dev.minor == minor)
	71	return serio_raw;
	72	}
	73
	74	return NULL;
	75	}
	76
	77	static int serio_raw_open(struct inode inode, struct file file)
	78	{
	79	struct serio_raw *serio_raw;
7c5bbb2e DT	80	struct serio_raw_client *client;
7c5bbb2e DT	81	int retval;
1da177e4	82
c4e32e9f	83	retval = mutex_lock_interruptible(&serio_raw_mutex);
1da177e4	84	if (retval)
77554b4d	85	return retval;
1da177e4	86
77554b4d TLSC	87	serio_raw = serio_raw_locate(iminor(inode));
77554b4d TLSC	88	if (!serio_raw) {
1da177e4 LT	89	retval = -ENODEV;
	90	goto out;
	91	}
	92
85f5b35d	93	if (serio_raw->dead) {
1da177e4 LT	94	retval = -ENODEV;
	95	goto out;
	96	}
	97
7c5bbb2e DT	98	client = kzalloc(sizeof(struct serio_raw_client), GFP_KERNEL);
7c5bbb2e DT	99	if (!client) {
1da177e4 LT	100	retval = -ENOMEM;
	101	goto out;
	102	}
	103
7c5bbb2e DT	104	client->serio_raw = serio_raw;
7c5bbb2e DT	105	file->private_data = client;
1da177e4	106
ba538cd2	107	kref_get(&serio_raw->kref);
843e784a DT	108
843e784a DT	109	serio_pause_rx(serio_raw->serio);
7c5bbb2e	110	list_add_tail(&client->node, &serio_raw->client_list);
843e784a	111	serio_continue_rx(serio_raw->serio);
1da177e4 LT	112
1da177e4 LT	113	out:
c4e32e9f	114	mutex_unlock(&serio_raw_mutex);
1da177e4 LT	115	return retval;
	116	}
	117
550eca7c	118	static void serio_raw_free(struct kref *kref)
1da177e4	119	{
ba538cd2 DT	120	struct serio_raw *serio_raw =
ba538cd2 DT	121	container_of(kref, struct serio_raw, kref);
1da177e4	122
85f5b35d	123	put_device(&serio_raw->serio->dev);
ba538cd2	124	kfree(serio_raw);
1da177e4 LT	125	}
	126
	127	static int serio_raw_release(struct inode inode, struct file file)
	128	{
7c5bbb2e DT	129	struct serio_raw_client *client = file->private_data;
7c5bbb2e DT	130	struct serio_raw *serio_raw = client->serio_raw;
1da177e4	131
550eca7c DT	132	serio_pause_rx(serio_raw->serio);
	133	list_del(&client->node);
	134	serio_continue_rx(serio_raw->serio);
1da177e4	135
550eca7c DT	136	kfree(client);
	137
	138	kref_put(&serio_raw->kref, serio_raw_free);
1da177e4	139
1da177e4 LT	140	return 0;
	141	}
	142
8c31eb01	143	static bool serio_raw_fetch_byte(struct serio_raw serio_raw, char c)
1da177e4	144	{
8c31eb01	145	bool empty;
1da177e4	146
843e784a	147	serio_pause_rx(serio_raw->serio);
1da177e4 LT	148
	149	empty = serio_raw->head == serio_raw->tail;
	150	if (!empty) {
	151	*c = serio_raw->queue[serio_raw->tail];
	152	serio_raw->tail = (serio_raw->tail + 1) % SERIO_RAW_QUEUE_LEN;
	153	}
	154
843e784a	155	serio_continue_rx(serio_raw->serio);
1da177e4 LT	156
	157	return !empty;
	158	}
	159
15a564d8 DT	160	static ssize_t serio_raw_read(struct file file, char __user buffer,
15a564d8 DT	161	size_t count, loff_t *ppos)
1da177e4	162	{
7c5bbb2e DT	163	struct serio_raw_client *client = file->private_data;
7c5bbb2e DT	164	struct serio_raw *serio_raw = client->serio_raw;
4f179f71	165	char uninitialized_var(c);
7a0a27d2	166	ssize_t read = 0;
46f49b7a	167	int error;
1da177e4	168
46f49b7a	169	for (;;) {
486c8aba DT	170	if (serio_raw->dead)
486c8aba DT	171	return -ENODEV;
1da177e4	172
486c8aba DT	173	if (serio_raw->head == serio_raw->tail &&
	174	(file->f_flags & O_NONBLOCK))
	175	return -EAGAIN;
1da177e4	176
486c8aba DT	177	if (count == 0)
486c8aba DT	178	break;
1da177e4	179
486c8aba	180	while (read < count && serio_raw_fetch_byte(serio_raw, &c)) {
46f49b7a DT	181	if (put_user(c, buffer++))
46f49b7a DT	182	return -EFAULT;
486c8aba DT	183	read++;
486c8aba DT	184	}
1da177e4	185
486c8aba	186	if (read)
7a0a27d2	187	break;
1da177e4	188
46f49b7a	189	if (!(file->f_flags & O_NONBLOCK)) {
486c8aba DT	190	error = wait_event_interruptible(serio_raw->wait,
	191	serio_raw->head != serio_raw->tail \|\|
	192	serio_raw->dead);
46f49b7a DT	193	if (error)
	194	return error;
	195	}
	196	}
486c8aba	197
46f49b7a	198	return read;
1da177e4 LT	199	}
1da177e4 LT	200
15a564d8 DT	201	static ssize_t serio_raw_write(struct file file, const char __user buffer,
15a564d8 DT	202	size_t count, loff_t *ppos)
1da177e4	203	{
7c5bbb2e DT	204	struct serio_raw_client *client = file->private_data;
7c5bbb2e DT	205	struct serio_raw *serio_raw = client->serio_raw;
46f49b7a	206	int retval = 0;
1da177e4 LT	207	unsigned char c;
1da177e4 LT	208
c4e32e9f	209	retval = mutex_lock_interruptible(&serio_raw_mutex);
1da177e4 LT	210	if (retval)
	211	return retval;
	212
85f5b35d	213	if (serio_raw->dead) {
1da177e4 LT	214	retval = -ENODEV;
	215	goto out;
	216	}
	217
	218	if (count > 32)
	219	count = 32;
	220
	221	while (count--) {
	222	if (get_user(c, buffer++)) {
	223	retval = -EFAULT;
	224	goto out;
	225	}
46f49b7a	226
7c5bbb2e	227	if (serio_write(serio_raw->serio, c)) {
46f49b7a DT	228	/* Either signal error or partial write */
	229	if (retval == 0)
	230	retval = -EIO;
1da177e4 LT	231	goto out;
1da177e4 LT	232	}
46f49b7a DT	233
46f49b7a DT	234	retval++;
d89c9bcb	235	}
1da177e4 LT	236
1da177e4 LT	237	out:
c4e32e9f	238	mutex_unlock(&serio_raw_mutex);
46f49b7a	239	return retval;
1da177e4 LT	240	}
	241
	242	static unsigned int serio_raw_poll(struct file file, poll_table wait)
	243	{
7c5bbb2e DT	244	struct serio_raw_client *client = file->private_data;
7c5bbb2e DT	245	struct serio_raw *serio_raw = client->serio_raw;
8c1c10d5	246	unsigned int mask;
1da177e4	247
7c5bbb2e	248	poll_wait(file, &serio_raw->wait, wait);
1da177e4	249
8c1c10d5	250	mask = serio_raw->dead ? POLLHUP \| POLLERR : POLLOUT \| POLLWRNORM;
7c5bbb2e	251	if (serio_raw->head != serio_raw->tail)
0c62fbf6	252	mask \|= POLLIN \| POLLRDNORM;
1da177e4	253
0c62fbf6	254	return mask;
1da177e4 LT	255	}
1da177e4 LT	256
2b8693c0	257	static const struct file_operations serio_raw_fops = {
7c5bbb2e DT	258	.owner = THIS_MODULE,
	259	.open = serio_raw_open,
	260	.release = serio_raw_release,
	261	.read = serio_raw_read,
	262	.write = serio_raw_write,
	263	.poll = serio_raw_poll,
	264	.fasync = serio_raw_fasync,
	265	.llseek = noop_llseek,
1da177e4 LT	266	};
	267
	268
	269	/*********************************************************************
15a564d8	270	* Interface with serio port *
1da177e4 LT	271	*********************************************************************/
	272
	273	static irqreturn_t serio_raw_interrupt(struct serio *serio, unsigned char data,
7d12e780	274	unsigned int dfl)
1da177e4 LT	275	{
1da177e4 LT	276	struct serio_raw *serio_raw = serio_get_drvdata(serio);
7c5bbb2e	277	struct serio_raw_client *client;
1da177e4 LT	278	unsigned int head = serio_raw->head;
1da177e4 LT	279
7c5bbb2e	280	/* we are holding serio->lock here so we are protected */
1da177e4 LT	281	serio_raw->queue[head] = data;
	282	head = (head + 1) % SERIO_RAW_QUEUE_LEN;
	283	if (likely(head != serio_raw->tail)) {
	284	serio_raw->head = head;
7c5bbb2e DT	285	list_for_each_entry(client, &serio_raw->client_list, node)
7c5bbb2e DT	286	kill_fasync(&client->fasync, SIGIO, POLL_IN);
1da177e4 LT	287	wake_up_interruptible(&serio_raw->wait);
	288	}
	289
	290	return IRQ_HANDLED;
	291	}
	292
	293	static int serio_raw_connect(struct serio serio, struct serio_driver drv)
	294	{
550eca7c	295	static atomic_t serio_raw_no = ATOMIC_INIT(0);
1da177e4 LT	296	struct serio_raw *serio_raw;
	297	int err;
	298
15a564d8 DT	299	serio_raw = kzalloc(sizeof(struct serio_raw), GFP_KERNEL);
15a564d8 DT	300	if (!serio_raw) {
8d928477	301	dev_dbg(&serio->dev, "can't allocate memory for a device\n");
1da177e4 LT	302	return -ENOMEM;
	303	}
	304
15a564d8	305	snprintf(serio_raw->name, sizeof(serio_raw->name),
550eca7c	306	"serio_raw%ld", (long)atomic_inc_return(&serio_raw_no) - 1);
ba538cd2	307	kref_init(&serio_raw->kref);
7c5bbb2e	308	INIT_LIST_HEAD(&serio_raw->client_list);
1da177e4 LT	309	init_waitqueue_head(&serio_raw->wait);
1da177e4 LT	310
85f5b35d DT	311	serio_raw->serio = serio;
	312	get_device(&serio->dev);
	313
1da177e4 LT	314	serio_set_drvdata(serio, serio_raw);
	315
	316	err = serio_open(serio, drv);
	317	if (err)
550eca7c DT	318	goto err_free;
	319
	320	err = mutex_lock_killable(&serio_raw_mutex);
	321	if (err)
	322	goto err_close;
1da177e4 LT	323
1da177e4 LT	324	list_add_tail(&serio_raw->node, &serio_raw_list);
550eca7c	325	mutex_unlock(&serio_raw_mutex);
1da177e4 LT	326
	327	serio_raw->dev.minor = PSMOUSE_MINOR;
	328	serio_raw->dev.name = serio_raw->name;
94fbcded	329	serio_raw->dev.parent = &serio->dev;
1da177e4 LT	330	serio_raw->dev.fops = &serio_raw_fops;
	331
	332	err = misc_register(&serio_raw->dev);
	333	if (err) {
	334	serio_raw->dev.minor = MISC_DYNAMIC_MINOR;
	335	err = misc_register(&serio_raw->dev);
	336	}
	337
	338	if (err) {
8d928477 DT	339	dev_err(&serio->dev,
8d928477 DT	340	"failed to register raw access device for %s\n",
1da177e4	341	serio->phys);
550eca7c	342	goto err_unlink;
1da177e4 LT	343	}
1da177e4 LT	344
8d928477 DT	345	dev_info(&serio->dev, "raw access enabled on %s (%s, minor %d)\n",
8d928477 DT	346	serio->phys, serio_raw->name, serio_raw->dev.minor);
550eca7c	347	return 0;
1da177e4	348
550eca7c	349	err_unlink:
1da177e4	350	list_del_init(&serio_raw->node);
550eca7c DT	351	err_close:
	352	serio_close(serio);
	353	err_free:
1da177e4	354	serio_set_drvdata(serio, NULL);
550eca7c	355	kref_put(&serio_raw->kref, serio_raw_free);
1da177e4 LT	356	return err;
	357	}
	358
	359	static int serio_raw_reconnect(struct serio *serio)
	360	{
	361	struct serio_raw *serio_raw = serio_get_drvdata(serio);
	362	struct serio_driver *drv = serio->drv;
	363
	364	if (!drv \|\| !serio_raw) {
8d928477 DT	365	dev_dbg(&serio->dev,
8d928477 DT	366	"reconnect request, but serio is disconnected, ignoring...\n");
1da177e4 LT	367	return -1;
	368	}
	369
	370	/*
	371	* Nothing needs to be done here, we just need this method to
	372	* keep the same device.
	373	*/
	374	return 0;
	375	}
	376
8c1c10d5 DT	377	/*
	378	* Wake up users waiting for IO so they can disconnect from
	379	* dead device.
	380	*/
	381	static void serio_raw_hangup(struct serio_raw *serio_raw)
	382	{
	383	struct serio_raw_client *client;
	384
	385	serio_pause_rx(serio_raw->serio);
	386	list_for_each_entry(client, &serio_raw->client_list, node)
	387	kill_fasync(&client->fasync, SIGIO, POLL_HUP);
	388	serio_continue_rx(serio_raw->serio);
	389
	390	wake_up_interruptible(&serio_raw->wait);
	391	}
	392
	393
1da177e4 LT	394	static void serio_raw_disconnect(struct serio *serio)
1da177e4 LT	395	{
8c1c10d5	396	struct serio_raw *serio_raw = serio_get_drvdata(serio);
1da177e4	397
550eca7c	398	misc_deregister(&serio_raw->dev);
1da177e4	399
550eca7c	400	mutex_lock(&serio_raw_mutex);
85f5b35d	401	serio_raw->dead = true;
550eca7c DT	402	list_del_init(&serio_raw->node);
	403	mutex_unlock(&serio_raw_mutex);
	404
8c1c10d5	405	serio_raw_hangup(serio_raw);
1da177e4	406
550eca7c DT	407	serio_close(serio);
550eca7c DT	408	kref_put(&serio_raw->kref, serio_raw_free);
8c1c10d5 DT	409
8c1c10d5 DT	410	serio_set_drvdata(serio, NULL);
1da177e4 LT	411	}
	412
	413	static struct serio_device_id serio_raw_serio_ids[] = {
	414	{
	415	.type = SERIO_8042,
	416	.proto = SERIO_ANY,
	417	.id = SERIO_ANY,
	418	.extra = SERIO_ANY,
	419	},
d19497e2 NV	420	{
	421	.type = SERIO_8042_XL,
	422	.proto = SERIO_ANY,
	423	.id = SERIO_ANY,
	424	.extra = SERIO_ANY,
	425	},
1da177e4 LT	426	{ 0 }
	427	};
	428
	429	MODULE_DEVICE_TABLE(serio, serio_raw_serio_ids);
	430
	431	static struct serio_driver serio_raw_drv = {
	432	.driver = {
	433	.name = "serio_raw",
	434	},
	435	.description = DRIVER_DESC,
	436	.id_table = serio_raw_serio_ids,
	437	.interrupt = serio_raw_interrupt,
	438	.connect = serio_raw_connect,
	439	.reconnect = serio_raw_reconnect,
	440	.disconnect = serio_raw_disconnect,
8c31eb01	441	.manual_bind = true,
1da177e4 LT	442	};
1da177e4 LT	443
65ac9f7a	444	module_serio_driver(serio_raw_drv);