Release 4.12 drivers/uio/uio.c

/*
 * drivers/uio/uio.c
 *
 * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de>
 * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
 * Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de>
 * Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com>
 *
 * Userspace IO
 *
 * Base Functions
 *
 * Licensed under the GPLv2 only.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/idr.h>
#include <linux/sched/signal.h>
#include <linux/string.h>
#include <linux/kobject.h>
#include <linux/cdev.h>
#include <linux/uio_driver.h>


#define UIO_MAX_DEVICES		(1U << MINORBITS)


static int uio_major;

static struct cdev *uio_cdev;
static DEFINE_IDR(uio_idr);

static const struct file_operations uio_fops;

/* Protect idr accesses */
static DEFINE_MUTEX(minor_lock);

/*
 * attributes
 */


struct uio_map {
	
struct kobject kobj;
	
struct uio_mem *mem;
};

#define to_map(map) container_of(map, struct uio_map, kobj)



static ssize_t map_name_show(struct uio_mem *mem, char *buf)
{
	if (unlikely(!mem->name))
		mem->name = "";

	return sprintf(buf, "%s\n", mem->name);
}

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static ssize_t map_addr_show(struct uio_mem *mem, char *buf)
{
	return sprintf(buf, "%pa\n", &mem->addr);
}

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Hans-Jürgen Koch
22
78.57%
1
33.33%
Brandon Philips
4
14.29%
1
33.33%
Cristian Stoica
2
7.14%
1
33.33%
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28
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3
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static ssize_t map_size_show(struct uio_mem *mem, char *buf)
{
	return sprintf(buf, "%pa\n", &mem->size);
}

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14
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1
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Hans-Jürgen Koch
12
42.86%
1
33.33%
Cristian Stoica
2
7.14%
1
33.33%
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28
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3
100.00%



static ssize_t map_offset_show(struct uio_mem *mem, char *buf)
{
	return sprintf(buf, "0x%llx\n", (unsigned long long)mem->offs);
}

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Hans-Jürgen Koch
25
78.12%
1
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Kai Jiang
6
18.75%
1
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Michal Sojka
1
3.12%
1
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32
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struct map_sysfs_entry {
	
struct attribute attr;
	
ssize_t (*show)(struct uio_mem *, char *);
	
ssize_t (*store)(struct uio_mem *, const char *, size_t);
};


static struct map_sysfs_entry name_attribute =
	__ATTR(name, S_IRUGO, map_name_show, NULL);

static struct map_sysfs_entry addr_attribute =
	__ATTR(addr, S_IRUGO, map_addr_show, NULL);

static struct map_sysfs_entry size_attribute =
	__ATTR(size, S_IRUGO, map_size_show, NULL);

static struct map_sysfs_entry offset_attribute =
	__ATTR(offset, S_IRUGO, map_offset_show, NULL);


static struct attribute *attrs[] = {
	&name_attribute.attr,
	&addr_attribute.attr,
	&size_attribute.attr,
	&offset_attribute.attr,
	NULL,	/* need to NULL terminate the list of attributes */
};



static void map_release(struct kobject *kobj)
{
	struct uio_map *map = to_map(kobj);
	kfree(map);
}

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static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr,
			     char *buf)
{
	struct uio_map *map = to_map(kobj);
	struct uio_mem *mem = map->mem;
	struct map_sysfs_entry *entry;

	entry = container_of(attr, struct map_sysfs_entry, attr);

	if (!entry->show)
		return -EIO;

	return entry->show(mem, buf);
}

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static const struct sysfs_ops map_sysfs_ops = {
	.show = map_type_show,
};


static struct kobj_type map_attr_type = {
	.release	= map_release,
	.sysfs_ops	= &map_sysfs_ops,
	.default_attrs	= attrs,
};


struct uio_portio {
	
struct kobject kobj;
	
struct uio_port *port;
};

#define to_portio(portio) container_of(portio, struct uio_portio, kobj)



static ssize_t portio_name_show(struct uio_port *port, char *buf)
{
	if (unlikely(!port->name))
		port->name = "";

	return sprintf(buf, "%s\n", port->name);
}

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static ssize_t portio_start_show(struct uio_port *port, char *buf)
{
	return sprintf(buf, "0x%lx\n", port->start);
}

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static ssize_t portio_size_show(struct uio_port *port, char *buf)
{
	return sprintf(buf, "0x%lx\n", port->size);
}

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static ssize_t portio_porttype_show(struct uio_port *port, char *buf)
{
	const char *porttypes[] = {"none", "x86", "gpio", "other"};

	if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER))
		return -EINVAL;

	return sprintf(buf, "port_%s\n", porttypes[port->porttype]);
}

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struct portio_sysfs_entry {
	
struct attribute attr;
	
ssize_t (*show)(struct uio_port *, char *);
	
ssize_t (*store)(struct uio_port *, const char *, size_t);
};


static struct portio_sysfs_entry portio_name_attribute =
	__ATTR(name, S_IRUGO, portio_name_show, NULL);

static struct portio_sysfs_entry portio_start_attribute =
	__ATTR(start, S_IRUGO, portio_start_show, NULL);

static struct portio_sysfs_entry portio_size_attribute =
	__ATTR(size, S_IRUGO, portio_size_show, NULL);

static struct portio_sysfs_entry portio_porttype_attribute =
	__ATTR(porttype, S_IRUGO, portio_porttype_show, NULL);


static struct attribute *portio_attrs[] = {
	&portio_name_attribute.attr,
	&portio_start_attribute.attr,
	&portio_size_attribute.attr,
	&portio_porttype_attribute.attr,
	NULL,
};



static void portio_release(struct kobject *kobj)
{
	struct uio_portio *portio = to_portio(kobj);
	kfree(portio);
}

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Hans-Jürgen Koch
17
65.38%
2
66.67%
Greg Kroah-Hartman
9
34.62%
1
33.33%
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26
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3
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static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr,
			     char *buf)
{
	struct uio_portio *portio = to_portio(kobj);
	struct uio_port *port = portio->port;
	struct portio_sysfs_entry *entry;

	entry = container_of(attr, struct portio_sysfs_entry, attr);

	if (!entry->show)
		return -EIO;

	return entry->show(port, buf);
}

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66
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1
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Hans-Jürgen Koch
11
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static const struct sysfs_ops portio_sysfs_ops = {
	.show = portio_type_show,
};


static struct kobj_type portio_attr_type = {
	.release	= portio_release,
	.sysfs_ops	= &portio_sysfs_ops,
	.default_attrs	= portio_attrs,
};



static ssize_t name_show(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	struct uio_device *idev = dev_get_drvdata(dev);
	return sprintf(buf, "%s\n", idev->info->name);
}
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Hans-Jürgen Koch
43
97.73%
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Greg Kroah-Hartman
1
2.27%
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static DEVICE_ATTR_RO(name);



static ssize_t version_show(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct uio_device *idev = dev_get_drvdata(dev);
	return sprintf(buf, "%s\n", idev->info->version);
}
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Hans-Jürgen Koch
43
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1
2.27%
1
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44
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static DEVICE_ATTR_RO(version);



static ssize_t event_show(struct device *dev,
			  struct device_attribute *attr, char *buf)
{
	struct uio_device *idev = dev_get_drvdata(dev);
	return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event));
}
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Hans-Jürgen Koch
49
98.00%
1
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Greg Kroah-Hartman
1
2.00%
1
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50
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100.00%

static DEVICE_ATTR_RO(event);


static struct attribute *uio_attrs[] = {
	&dev_attr_name.attr,
	&dev_attr_version.attr,
	&dev_attr_event.attr,
	NULL,
};

ATTRIBUTE_GROUPS(uio);

/* UIO class infrastructure */

static struct class uio_class = {
	.name = "uio",
	.dev_groups = uio_groups,
};

/*
 * device functions
 */


static int uio_dev_add_attributes(struct uio_device *idev)
{
	int ret;
	int mi, pi;
	int map_found = 0;
	int portio_found = 0;
	struct uio_mem *mem;
	struct uio_map *map;
	struct uio_port *port;
	struct uio_portio *portio;

	for (mi = 0; mi < MAX_UIO_MAPS; mi++) {
		mem = &idev->info->mem[mi];
		if (mem->size == 0)
			break;
		if (!map_found) {
			map_found = 1;
			idev->map_dir = kobject_create_and_add("maps",
							&idev->dev->kobj);
			if (!idev->map_dir) {
				ret = -ENOMEM;
				goto err_map;
			}
		}
		map = kzalloc(sizeof(*map), GFP_KERNEL);
		if (!map) {
			ret = -ENOMEM;
			goto err_map;
		}
		kobject_init(&map->kobj, &map_attr_type);
		map->mem = mem;
		mem->map = map;
		ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi);
		if (ret)
			goto err_map_kobj;
		ret = kobject_uevent(&map->kobj, KOBJ_ADD);
		if (ret)
			goto err_map_kobj;
	}

	for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) {
		port = &idev->info->port[pi];
		if (port->size == 0)
			break;
		if (!portio_found) {
			portio_found = 1;
			idev->portio_dir = kobject_create_and_add("portio",
							&idev->dev->kobj);
			if (!idev->portio_dir) {
				ret = -ENOMEM;
				goto err_portio;
			}
		}
		portio = kzalloc(sizeof(*portio), GFP_KERNEL);
		if (!portio) {
			ret = -ENOMEM;
			goto err_portio;
		}
		kobject_init(&portio->kobj, &portio_attr_type);
		portio->port = port;
		port->portio = portio;
		ret = kobject_add(&portio->kobj, idev->portio_dir,
							"port%d", pi);
		if (ret)
			goto err_portio_kobj;
		ret = kobject_uevent(&portio->kobj, KOBJ_ADD);
		if (ret)
			goto err_portio_kobj;
	}

	return 0;

err_portio:
	pi--;
err_portio_kobj:
	for (; pi >= 0; pi--) {
		port = &idev->info->port[pi];
		portio = port->portio;
		kobject_put(&portio->kobj);
	}
	kobject_put(idev->portio_dir);
err_map:
	mi--;
err_map_kobj:
	for (; mi >= 0; mi--) {
		mem = &idev->info->mem[mi];
		map = mem->map;
		kobject_put(&map->kobj);
	}
	kobject_put(idev->map_dir);
	dev_err(idev->dev, "error creating sysfs files (%d)\n", ret);
	return ret;
}

Contributors
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Hans-Jürgen Koch
401
77.12%
2
22.22%
Greg Kroah-Hartman
75
14.42%
4
44.44%
Dan Carpenter
28
5.38%
1
11.11%
Cong Ding
12
2.31%
1
11.11%
Suman Anna
4
0.77%
1
11.11%
Total
520
100.00%
9
100.00%



static void uio_dev_del_attributes(struct uio_device *idev)
{
	int i;
	struct uio_mem *mem;
	struct uio_port *port;

	for (i = 0; i < MAX_UIO_MAPS; i++) {
		mem = &idev->info->mem[i];
		if (mem->size == 0)
			break;
		kobject_put(&mem->map->kobj);
	}
	kobject_put(idev->map_dir);

	for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) {
		port = &idev->info->port[i];
		if (port->size == 0)
			break;
		kobject_put(&port->portio->kobj);
	}
	kobject_put(idev->portio_dir);
}

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Hans-Jürgen Koch
125
96.15%
2
50.00%
Greg Kroah-Hartman
5
3.85%
2
50.00%
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130
100.00%
4
100.00%



static int uio_get_minor(struct uio_device *idev)
{
	int retval = -ENOMEM;

	mutex_lock(&minor_lock);
	retval = idr_alloc(&uio_idr, idev, 0, UIO_MAX_DEVICES, GFP_KERNEL);
	if (retval >= 0) {
		idev->minor = retval;
		retval = 0;
	} else if (retval == -ENOSPC) {
		dev_err(idev->dev, "too many uio devices\n");
		retval = -EINVAL;
	}
	mutex_unlock(&minor_lock);
	return retval;
}

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52
57.78%
1
25.00%
Hillf Danton
18
20.00%
1
25.00%
Tejun Heo
16
17.78%
1
25.00%
Damian Hobson-Garcia
4
4.44%
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90
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4
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static void uio_free_minor(struct uio_device *idev)
{
	mutex_lock(&minor_lock);
	idr_remove(&uio_idr, idev->minor);
	mutex_unlock(&minor_lock);
}

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21
63.64%
1
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Jonathan Corbet
12
36.36%
1
50.00%
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33
100.00%
2
100.00%

/**
 * uio_event_notify - trigger an interrupt event
 * @info: UIO device capabilities
 */


void uio_event_notify(struct uio_info *info)
{
	struct uio_device *idev = info->uio_dev;

	atomic_inc(&idev->event);
	wake_up_interruptible(&idev->wait);
	kill_fasync(&idev->async_queue, SIGIO, POLL_IN);
}
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EXPORT_SYMBOL_GPL(uio_event_notify);

/**
 * uio_interrupt - hardware interrupt handler
 * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer
 * @dev_id: Pointer to the devices uio_device structure
 */


static irqreturn_t uio_interrupt(int irq, void *dev_id)
{
	struct uio_device *idev = (struct uio_device *)dev_id;
	irqreturn_t ret = idev->info->handler(irq, idev->info);

	if (ret == IRQ_HANDLED)
		uio_event_notify(idev->info);

	return ret;
}

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struct uio_listener {
	
struct uio_device *dev;
	
s32 event_count;
};



static int uio_open(struct inode *inode, struct file *filep)
{
	struct uio_device *idev;
	struct uio_listener *listener;
	int ret = 0;

	mutex_lock(&minor_lock);
	idev = idr_find(&uio_idr, iminor(inode));
	mutex_unlock(&minor_lock);
	if (!idev) {
		ret = -ENODEV;
		goto out;
	}

	if (!try_module_get(idev->owner)) {
		ret = -ENODEV;
		goto out;
	}

	listener = kmalloc(sizeof(*listener), GFP_KERNEL);
	if (!listener) {
		ret = -ENOMEM;
		goto err_alloc_listener;
	}

	listener->dev = idev;
	listener->event_count = atomic_read(&idev->event);
	filep->private_data = listener;

	if (idev->info->open) {
		ret = idev->info->open(idev->info, inode);
		if (ret)
			goto err_infoopen;
	}
	return 0;

err_infoopen:
	kfree(listener);

err_alloc_listener:
	module_put(idev->owner);

out:
	return ret;
}

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65.83%
1
25.00%
Uwe Kleine-König
38
19.10%
1
25.00%
Jonathan Corbet
30
15.08%
2
50.00%
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199
100.00%
4
100.00%



static int uio_fasync(int fd, struct file *filep, int on)
{
	struct uio_listener *listener = filep->private_data;
	struct uio_device *idev = listener->dev;

	return fasync_helper(fd, filep, on, &idev->async_queue);
}

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50
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static int uio_release(struct inode *inode, struct file *filep)
{
	int ret = 0;
	struct uio_listener *listener = filep->private_data;
	struct uio_device *idev = listener->dev;

	if (idev->info->release)
		ret = idev->info->release(idev->info, inode);

	module_put(idev->owner);
	kfree(listener);
	return ret;
}

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static unsigned int uio_poll(struct file *filep, poll_table *wait)
{
	struct uio_listener *listener = filep->private_data;
	struct uio_device *idev = listener->dev;

	if (!idev->info->irq)
		return -EIO;

	poll_wait(filep, &idev->wait, wait);
	if (listener->event_count != atomic_read(&idev->event))
		return POLLIN | POLLRDNORM;
	return 0;
}

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98.77%
1
50.00%
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1
1.23%
1
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100.00%
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static ssize_t uio_read(struct file *filep, char __user *buf,
			size_t count, loff_t *ppos)
{
	struct uio_listener *listener = filep->private_data;
	struct uio_device *idev = listener->dev;
	DECLARE_WAITQUEUE(wait, current);
	ssize_t retval;
	s32 event_count;

	if (!idev->info->irq)
		return -EIO;

	if (count != sizeof(s32))
		return -EINVAL;

	add_wait_queue(&idev->wait, &wait);

	do {
		set_current_state(TASK_INTERRUPTIBLE);

		event_count = atomic_read(&idev->event);
		if (event_count != listener->event_count) {
			__set_current_state(TASK_RUNNING);
			if (copy_to_user(buf, &event_count, count))
				retval = -EFAULT;
			else {
				listener->event_count = event_count;
				retval = count;
			}
			break;
		}

		if (filep->f_flags & O_NONBLOCK) {
			retval = -EAGAIN;
			break;
		}

		if (signal_pending(current)) {
			retval = -ERESTARTSYS;
			break;
		}
		schedule();
	} while (1);

	__set_current_state(TASK_RUNNING);
	remove_wait_queue(&idev->wait, &wait);

	return retval;
}

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1
33.33%
Michal Hocko
5
2.35%
1
33.33%
Eric W. Biedermann
1
0.47%
1
33.33%
Total
213
100.00%
3
100.00%



static ssize_t uio_write(struct file *filep, const char __user *buf,
			size_t count, loff_t *ppos)
{
	struct uio_listener *listener = filep->private_data;
	struct uio_device *idev = listener->dev;
	ssize_t retval;
	s32 irq_on;

	if (!idev->info->irq)
		return -EIO;

	if (count != sizeof(s32))
		return -EINVAL;

	if (!idev->info->irqcontrol)
		return -ENOSYS;

	if (copy_from_user(&irq_on, buf, count))
		return -EFAULT;

	retval = idev->info->irqcontrol(idev->info, irq_on);

	return retval ? retval : sizeof(s32);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
127
99.22%
1
50.00%
Eric W. Biedermann
1
0.78%
1
50.00%
Total
128
100.00%
2
100.00%



static int uio_find_mem_index(struct vm_area_struct *vma)
{
	struct uio_device *idev = vma->vm_private_data;

	if (vma->vm_pgoff < MAX_UIO_MAPS) {
		if (idev->info->mem[vma->vm_pgoff].size == 0)
			return -1;
		return (int)vma->vm_pgoff;
	}
	return -1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
50
79.37%
1
50.00%
Hillf Danton
13
20.63%
1
50.00%
Total
63
100.00%
2
100.00%



static int uio_vma_fault(struct vm_fault *vmf)
{
	struct uio_device *idev = vmf->vma->vm_private_data;
	struct page *page;
	unsigned long offset;
	void *addr;

	int mi = uio_find_mem_index(vmf->vma);
	if (mi < 0)
		return VM_FAULT_SIGBUS;

	/*
         * We need to subtract mi because userspace uses offset = N*PAGE_SIZE
         * to use mem[N].
         */
	offset = (vmf->pgoff - mi) << PAGE_SHIFT;

	addr = (void *)(unsigned long)idev->info->mem[mi].addr + offset;
	if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL)
		page = virt_to_page(addr);
	else
		page = vmalloc_to_page(addr);
	get_page(page);
	vmf->page = page;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
76
56.72%
1
20.00%
Ben Hutchings
27
20.15%
1
20.00%
Andrew G. Harvey
17
12.69%
1
20.00%
Nicholas Piggin
10
7.46%
1
20.00%
Dave Jiang
4
2.99%
1
20.00%
Total
134
100.00%
5
100.00%


static const struct vm_operations_struct uio_logical_vm_ops = {
	.fault = uio_vma_fault,
};



static int uio_mmap_logical(struct vm_area_struct *vma)
{
	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
	vma->vm_ops = &uio_logical_vm_ops;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Uwe Kleine-König
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%


static const struct vm_operations_struct uio_physical_vm_ops = {
#ifdef CONFIG_HAVE_IOREMAP_PROT
	.access = generic_access_phys,
#endif
};



static int uio_mmap_physical(struct vm_area_struct *vma)
{
	struct uio_device *idev = vma->vm_private_data;
	int mi = uio_find_mem_index(vma);
	struct uio_mem *mem;
	if (mi < 0)
		return -EINVAL;
	mem = idev->info->mem + mi;

	if (mem->addr & ~PAGE_MASK)
		return -ENODEV;
	if (vma->vm_end - vma->vm_start > mem->size)
		return -EINVAL;

	vma->vm_ops = &uio_physical_vm_ops;
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

	/*
         * We cannot use the vm_iomap_memory() helper here,
         * because vma->vm_pgoff is the map index we looked
         * up above in uio_find_mem_index(), rather than an
         * actual page offset into the mmap.
         *
         * So we just do the physical mmap without a page
         * offset.
         */
	return remap_pfn_range(vma,
			       vma->vm_start,
			       mem->addr >> PAGE_SHIFT,
			       vma->vm_end - vma->vm_start,
			       vma->vm_page_prot);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
67
51.15%
1
20.00%
Linus Torvalds
48
36.64%
2
40.00%
Jean-Samuel Chenard
9
6.87%
1
20.00%
Uwe Kleine-König
7
5.34%
1
20.00%
Total
131
100.00%
5
100.00%



static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
{
	struct uio_listener *listener = filep->private_data;
	struct uio_device *idev = listener->dev;
	int mi;
	unsigned long requested_pages, actual_pages;
	int ret = 0;

	if (vma->vm_end < vma->vm_start)
		return -EINVAL;

	vma->vm_private_data = idev;

	mi = uio_find_mem_index(vma);
	if (mi < 0)
		return -EINVAL;

	requested_pages = vma_pages(vma);
	actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK)
			+ idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT;
	if (requested_pages > actual_pages)
		return -EINVAL;

	if (idev->info->mmap) {
		ret = idev->info->mmap(idev->info, vma);
		return ret;
	}

	switch (idev->info->mem[mi].memtype) {
		case UIO_MEM_PHYS:
			return uio_mmap_physical(vma);
		case UIO_MEM_LOGICAL:
		case UIO_MEM_VIRTUAL:
			return uio_mmap_logical(vma);
		default:
			return -EINVAL;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
189
90.87%
1
33.33%
Ian Abbott
16
7.69%
1
33.33%
Li Bin
3
1.44%
1
33.33%
Total
208
100.00%
3
100.00%


static const struct file_operations uio_fops = {
	.owner		= THIS_MODULE,
	.open		= uio_open,
	.release	= uio_release,
	.read		= uio_read,
	.write		= uio_write,
	.mmap		= uio_mmap,
	.poll		= uio_poll,
	.fasync		= uio_fasync,
	.llseek		= noop_llseek,
};



static int uio_major_init(void)
{
	static const char name[] = "uio";
	struct cdev *cdev = NULL;
	dev_t uio_dev = 0;
	int result;

	result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name);
	if (result)
		goto out;

	result = -ENOMEM;
	cdev = cdev_alloc();
	if (!cdev)
		goto out_unregister;

	cdev->owner = THIS_MODULE;
	cdev->ops = &uio_fops;
	kobject_set_name(&cdev->kobj, "%s", name);

	result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES);
	if (result)
		goto out_put;

	uio_major = MAJOR(uio_dev);
	uio_cdev = cdev;
	return 0;
out_put:
	kobject_put(&cdev->kobj);
out_unregister:
	unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES);
out:
	return result;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
124
82.12%
1
33.33%
Hans-Jürgen Koch
22
14.57%
1
33.33%
Wanlong Gao
5
3.31%
1
33.33%
Total
151
100.00%
3
100.00%



static void uio_major_cleanup(void)
{
	unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES);
	cdev_del(uio_cdev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
13
52.00%
1
50.00%
Eric W. Biedermann
12
48.00%
1
50.00%
Total
25
100.00%
2
100.00%



static int init_uio_class(void)
{
	int ret;

	/* This is the first time in here, set everything up properly */
	ret = uio_major_init();
	if (ret)
		goto exit;

	ret = class_register(&uio_class);
	if (ret) {
		printk(KERN_ERR "class_register failed for uio\n");
		goto err_class_register;
	}
	return 0;

err_class_register:
	uio_major_cleanup();
exit:
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
55
91.67%
1
50.00%
Eric W. Biedermann
5
8.33%
1
50.00%
Total
60
100.00%
2
100.00%



static void release_uio_class(void)
{
	class_unregister(&uio_class);
	uio_major_cleanup();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
14
82.35%
1
33.33%
Eric W. Biedermann
3
17.65%
2
66.67%
Total
17
100.00%
3
100.00%

/**
 * uio_register_device - register a new userspace IO device
 * @owner:      module that creates the new device
 * @parent:     parent device
 * @info:       UIO device capabilities
 *
 * returns zero on success or a negative error code.
 */


int __uio_register_device(struct module *owner,
			  struct device *parent,
			  struct uio_info *info)
{
	struct uio_device *idev;
	int ret = 0;

	if (!parent || !info || !info->name || !info->version)
		return -EINVAL;

	info->uio_dev = NULL;

	idev = devm_kzalloc(parent, sizeof(*idev), GFP_KERNEL);
	if (!idev) {
		return -ENOMEM;
	}

	idev->owner = owner;
	idev->info = info;
	init_waitqueue_head(&idev->wait);
	atomic_set(&idev->event, 0);

	ret = uio_get_minor(idev);
	if (ret)
		return ret;

	idev->dev = device_create(&uio_class, parent,
				  MKDEV(uio_major, idev->minor), idev,
				  "uio%d", idev->minor);
	if (IS_ERR(idev->dev)) {
		printk(KERN_ERR "UIO: device register failed\n");
		ret = PTR_ERR(idev->dev);
		goto err_device_create;
	}

	ret = uio_dev_add_attributes(idev);
	if (ret)
		goto err_uio_dev_add_attributes;

	info->uio_dev = idev;

	if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) {
		/*
                 * Note that we deliberately don't use devm_request_irq
                 * here. The parent module can unregister the UIO device
                 * and call pci_disable_msi, which requires that this
                 * irq has been freed. However, the device may have open
                 * FDs at the time of unregister and therefore may not be
                 * freed until they are released.
                 */
		ret = request_irq(info->irq, uio_interrupt,
				  info->irq_flags, info->name, idev);
		if (ret)
			goto err_request_irq;
	}

	return 0;

err_request_irq:
	uio_dev_del_attributes(idev);
err_uio_dev_add_attributes:
	device_destroy(&uio_class, MKDEV(uio_major, idev->minor));
err_device_create:
	uio_free_minor(idev);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
266
92.36%
1
14.29%
Eric W. Biedermann
9
3.12%
2
28.57%
Michal Simek
8
2.78%
1
14.29%
Greg Kroah-Hartman
3
1.04%
2
28.57%
Brian Russell
2
0.69%
1
14.29%
Total
288
100.00%
7
100.00%


EXPORT_SYMBOL_GPL(__uio_register_device);

/**
 * uio_unregister_device - unregister a industrial IO device
 * @info:       UIO device capabilities
 *
 */


void uio_unregister_device(struct uio_info *info)
{
	struct uio_device *idev;

	if (!info || !info->uio_dev)
		return;

	idev = info->uio_dev;

	uio_free_minor(idev);

	uio_dev_del_attributes(idev);

	if (info->irq && info->irq != UIO_IRQ_CUSTOM)
		free_irq(info->irq, idev);

	device_destroy(&uio_class, MKDEV(uio_major, idev->minor));

	return;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
57
72.15%
1
25.00%
Stephen Hemminger
12
15.19%
1
25.00%
Brian Russell
9
11.39%
1
25.00%
Eric W. Biedermann
1
1.27%
1
25.00%
Total
79
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(uio_unregister_device);



static int __init uio_init(void)
{
	return init_uio_class();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
11
84.62%
1
50.00%
Eric W. Biedermann
2
15.38%
1
50.00%
Total
13
100.00%
2
100.00%



static void __exit uio_exit(void)
{
	release_uio_class();
	idr_destroy(&uio_idr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
7
38.89%
1
33.33%
Johannes Thumshirn
6
33.33%
1
33.33%
Eric W. Biedermann
5
27.78%
1
33.33%
Total
18
100.00%
3
100.00%

module_init(uio_init)
module_exit(uio_exit)
MODULE_LICENSE("GPL v2");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Hans-Jürgen Koch
3165
76.52%
6
11.11%
Greg Kroah-Hartman
196
4.74%
7
12.96%
Eric W. Biedermann
186
4.50%
4
7.41%
Brandon Philips
141
3.41%
1
1.85%
Uwe Kleine-König
94
2.27%
2
3.70%
Jonathan Corbet
49
1.18%
2
3.70%
Linus Torvalds
48
1.16%
2
3.70%
Hillf Danton
31
0.75%
2
3.70%
Dan Carpenter
28
0.68%
1
1.85%
Ben Hutchings
27
0.65%
1
1.85%
Tejun Heo
19
0.46%
2
3.70%
Andrew G. Harvey
17
0.41%
1
1.85%
Ian Abbott
16
0.39%
1
1.85%
Stephen Hemminger
12
0.29%
1
1.85%
Cong Ding
12
0.29%
1
1.85%
Nicholas Piggin
12
0.29%
1
1.85%
Brian Russell
11
0.27%
1
1.85%
Jean-Samuel Chenard
9
0.22%
1
1.85%
Michal Simek
8
0.19%
1
1.85%
Johannes Thumshirn
6
0.15%
1
1.85%
Kai Jiang
6
0.15%
1
1.85%
Wanlong Gao
5
0.12%
1
1.85%
Michal Hocko
5
0.12%
1
1.85%
Arnd Bergmann
5
0.12%
1
1.85%
Damian Hobson-Garcia
4
0.10%
1
1.85%
Suman Anna
4
0.10%
1
1.85%
Cristian Stoica
4
0.10%
1
1.85%
Dave Jiang
4
0.10%
1
1.85%
Alexey Dobriyan
3
0.07%
2
3.70%
Li Bin
3
0.07%
1
1.85%
Jan Engelhardt
2
0.05%
1
1.85%
Emese Revfy
2
0.05%
1
1.85%
Michal Sojka
1
0.02%
1
1.85%
Ingo Molnar
1
0.02%
1
1.85%
Total
4136
100.00%
54
100.00%
Directory: drivers/uio

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