Release 4.12 drivers/i2c/i2c-dev.c

/*
    i2c-dev.c - i2c-bus driver, char device interface

    Copyright (C) 1995-97 Simon G. Vogl
    Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
    Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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.
*/

/* Note that this is a complete rewrite of Simon Vogl's i2c-dev module.
   But I have used so much of his original code and ideas that it seems
   only fair to recognize him as co-author -- Frodo */

/* The I2C_RDWR ioctl code is written by Kolja Waschk <waschk@telos.de> */

#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/i2c-dev.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

/*
 * An i2c_dev represents an i2c_adapter ... an I2C or SMBus master, not a
 * slave (i2c_client) with which messages will be exchanged.  It's coupled
 * with a character special file which is accessed by user mode drivers.
 *
 * The list of i2c_dev structures is parallel to the i2c_adapter lists
 * maintained by the driver model, and is updated using bus notifications.
 */

struct i2c_dev {
	
struct list_head list;
	
struct i2c_adapter *adap;
	
struct device *dev;
	
struct cdev cdev;
};


#define I2C_MINORS	MINORMASK
static LIST_HEAD(i2c_dev_list);
static DEFINE_SPINLOCK(i2c_dev_list_lock);



static struct i2c_dev *i2c_dev_get_by_minor(unsigned index)
{
	struct i2c_dev *i2c_dev;

	spin_lock(&i2c_dev_list_lock);
	list_for_each_entry(i2c_dev, &i2c_dev_list, list) {
		if (i2c_dev->adap->nr == index)
			goto found;
	}
	i2c_dev = NULL;
found:
	spin_unlock(&i2c_dev_list_lock);
	return i2c_dev;
}

Contributors
Person
Tokens
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Commits
CommitProp
Jean Delvare
28
46.67%
1
25.00%
Greg Kroah-Hartman
27
45.00%
1
25.00%
Linus Torvalds (pre-git)
4
6.67%
1
25.00%
Mark M. Hoffman
1
1.67%
1
25.00%
Total
60
100.00%
4
100.00%



static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap)
{
	struct i2c_dev *i2c_dev;

	if (adap->nr >= I2C_MINORS) {
		printk(KERN_ERR "i2c-dev: Out of device minors (%d)\n",
		       adap->nr);
		return ERR_PTR(-ENODEV);
	}

	i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL);
	if (!i2c_dev)
		return ERR_PTR(-ENOMEM);
	i2c_dev->adap = adap;

	spin_lock(&i2c_dev_list_lock);
	list_add_tail(&i2c_dev->list, &i2c_dev_list);
	spin_unlock(&i2c_dev_list_lock);
	return i2c_dev;
}

Contributors
Person
Tokens
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Commits
CommitProp
Greg Kroah-Hartman
54
52.94%
2
28.57%
Jean Delvare
40
39.22%
1
14.29%
Linus Torvalds (pre-git)
5
4.90%
1
14.29%
Art Haas
1
0.98%
1
14.29%
Gerd Knorr
1
0.98%
1
14.29%
Deepak Saxena
1
0.98%
1
14.29%
Total
102
100.00%
7
100.00%



static void put_i2c_dev(struct i2c_dev *i2c_dev)
{
	spin_lock(&i2c_dev_list_lock);
	list_del(&i2c_dev->list);
	spin_unlock(&i2c_dev_list_lock);
	kfree(i2c_dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Greg Kroah-Hartman
20
55.56%
1
20.00%
Jean Delvare
12
33.33%
2
40.00%
Linus Torvalds (pre-git)
3
8.33%
1
20.00%
Wolfram Sang
1
2.78%
1
20.00%
Total
36
100.00%
5
100.00%



static ssize_t name_show(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(dev->devt));

	if (!i2c_dev)
		return -ENODEV;
	return sprintf(buf, "%s\n", i2c_dev->adap->name);
}
Contributors
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Tokens
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CommitProp
Greg Kroah-Hartman
57
98.28%
3
75.00%
Guenter Roeck
1
1.72%
1
25.00%
Total
58
100.00%
4
100.00%

static DEVICE_ATTR_RO(name);


static struct attribute *i2c_attrs[] = {
	&dev_attr_name.attr,
	NULL,
};

ATTRIBUTE_GROUPS(i2c);

/* ------------------------------------------------------------------------- */

/*
 * After opening an instance of this character special file, a file
 * descriptor starts out associated only with an i2c_adapter (and bus).
 *
 * Using the I2C_RDWR ioctl(), you can then *immediately* issue i2c_msg
 * traffic to any devices on the bus used by that adapter.  That's because
 * the i2c_msg vectors embed all the addressing information they need, and
 * are submitted directly to an i2c_adapter.  However, SMBus-only adapters
 * don't support that interface.
 *
 * To use read()/write() system calls on that file descriptor, or to use
 * SMBus interfaces (and work with SMBus-only hosts!), you must first issue
 * an I2C_SLAVE (or I2C_SLAVE_FORCE) ioctl.  That configures an anonymous
 * (never registered) i2c_client so it holds the addressing information
 * needed by those system calls and by this SMBus interface.
 */



static ssize_t i2cdev_read(struct file *file, char __user *buf, size_t count,
		loff_t *offset)
{
	char *tmp;
	int ret;

	struct i2c_client *client = file->private_data;

	if (count > 8192)
		count = 8192;

	tmp = kmalloc(count, GFP_KERNEL);
	if (tmp == NULL)
		return -ENOMEM;

	pr_debug("i2c-dev: i2c-%d reading %zu bytes.\n",
		iminor(file_inode(file)), count);

	ret = i2c_master_recv(client, tmp, count);
	if (ret >= 0)
		ret = copy_to_user(buf, tmp, count) ? -EFAULT : ret;
	kfree(tmp);
	return ret;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
106
85.48%
3
33.33%
Dave Jones
10
8.06%
1
11.11%
Al Viro
4
3.23%
2
22.22%
Greg Kroah-Hartman
3
2.42%
2
22.22%
David Brownell
1
0.81%
1
11.11%
Total
124
100.00%
9
100.00%



static ssize_t i2cdev_write(struct file *file, const char __user *buf,
		size_t count, loff_t *offset)
{
	int ret;
	char *tmp;
	struct i2c_client *client = file->private_data;

	if (count > 8192)
		count = 8192;

	tmp = memdup_user(buf, count);
	if (IS_ERR(tmp))
		return PTR_ERR(tmp);

	pr_debug("i2c-dev: i2c-%d writing %zu bytes.\n",
		iminor(file_inode(file)), count);

	ret = i2c_master_send(client, tmp, count);
	kfree(tmp);
	return ret;
}

Contributors
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Commits
CommitProp
Linus Torvalds (pre-git)
82
77.36%
2
22.22%
Dave Jones
10
9.43%
1
11.11%
Julia Lawall
6
5.66%
1
11.11%
Al Viro
4
3.77%
2
22.22%
Greg Kroah-Hartman
3
2.83%
2
22.22%
David Brownell
1
0.94%
1
11.11%
Total
106
100.00%
9
100.00%



static int i2cdev_check(struct device *dev, void *addrp)
{
	struct i2c_client *client = i2c_verify_client(dev);

	if (!client || client->addr != *(unsigned int *)addrp)
		return 0;

	return dev->driver ? -EBUSY : 0;
}

Contributors
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David Brownell
29
52.73%
1
50.00%
Jean Delvare
26
47.27%
1
50.00%
Total
55
100.00%
2
100.00%

/* walk up mux tree */


static int i2cdev_check_mux_parents(struct i2c_adapter *adapter, int addr)
{
	struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter);
	int result;

	result = device_for_each_child(&adapter->dev, &addr, i2cdev_check);
	if (!result && parent)
		result = i2cdev_check_mux_parents(parent, addr);

	return result;
}

Contributors
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Michael Lawnick
50
81.97%
1
50.00%
Jean Delvare
11
18.03%
1
50.00%
Total
61
100.00%
2
100.00%

/* recurse down mux tree */


static int i2cdev_check_mux_children(struct device *dev, void *addrp)
{
	int result;

	if (dev->type == &i2c_adapter_type)
		result = device_for_each_child(dev, addrp,
						i2cdev_check_mux_children);
	else
		result = i2cdev_check(dev, addrp);

	return result;
}

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Michael Lawnick
51
100.00%
1
100.00%
Total
51
100.00%
1
100.00%

/* This address checking function differs from the one in i2c-core
   in that it considers an address with a registered device, but no
   driver bound to it, as NOT busy. */


static int i2cdev_check_addr(struct i2c_adapter *adapter, unsigned int addr)
{
	struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter);
	int result = 0;

	if (parent)
		result = i2cdev_check_mux_parents(parent, addr);

	if (!result)
		result = device_for_each_child(&adapter->dev, &addr,
						i2cdev_check_mux_children);

	return result;
}

Contributors
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CommitProp
Michael Lawnick
28
42.42%
1
25.00%
David Brownell
20
30.30%
1
25.00%
Jean Delvare
18
27.27%
2
50.00%
Total
66
100.00%
4
100.00%



static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
		unsigned long arg)
{
	struct i2c_rdwr_ioctl_data rdwr_arg;
	struct i2c_msg *rdwr_pa;
	u8 __user **data_ptrs;
	int i, res;

	if (copy_from_user(&rdwr_arg,
			   (struct i2c_rdwr_ioctl_data __user *)arg,
			   sizeof(rdwr_arg)))
		return -EFAULT;

	/* Put an arbitrary limit on the number of messages that can
         * be sent at once */
	if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS)
		return -EINVAL;

	rdwr_pa = memdup_user(rdwr_arg.msgs,
			      rdwr_arg.nmsgs * sizeof(struct i2c_msg));
	if (IS_ERR(rdwr_pa))
		return PTR_ERR(rdwr_pa);

	data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL);
	if (data_ptrs == NULL) {
		kfree(rdwr_pa);
		return -ENOMEM;
	}

	res = 0;
	for (i = 0; i < rdwr_arg.nmsgs; i++) {
		/* Limit the size of the message to a sane amount */
		if (rdwr_pa[i].len > 8192) {
			res = -EINVAL;
			break;
		}

		data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf;
		rdwr_pa[i].buf = memdup_user(data_ptrs[i], rdwr_pa[i].len);
		if (IS_ERR(rdwr_pa[i].buf)) {
			res = PTR_ERR(rdwr_pa[i].buf);
			break;
		}

		/*
                 * If the message length is received from the slave (similar
                 * to SMBus block read), we must ensure that the buffer will
                 * be large enough to cope with a message length of
                 * I2C_SMBUS_BLOCK_MAX as this is the maximum underlying bus
                 * drivers allow. The first byte in the buffer must be
                 * pre-filled with the number of extra bytes, which must be
                 * at least one to hold the message length, but can be
                 * greater (for example to account for a checksum byte at
                 * the end of the message.)
                 */
		if (rdwr_pa[i].flags & I2C_M_RECV_LEN) {
			if (!(rdwr_pa[i].flags & I2C_M_RD) ||
			    rdwr_pa[i].buf[0] < 1 ||
			    rdwr_pa[i].len < rdwr_pa[i].buf[0] +
					     I2C_SMBUS_BLOCK_MAX) {
				res = -EINVAL;
				break;
			}

			rdwr_pa[i].len = rdwr_pa[i].buf[0];
		}
	}
	if (res < 0) {
		int j;
		for (j = 0; j < i; ++j)
			kfree(rdwr_pa[j].buf);
		kfree(data_ptrs);
		kfree(rdwr_pa);
		return res;
	}

	res = i2c_transfer(client->adapter, rdwr_pa, rdwr_arg.nmsgs);
	while (i-- > 0) {
		if (res >= 0 && (rdwr_pa[i].flags & I2C_M_RD)) {
			if (copy_to_user(data_ptrs[i], rdwr_pa[i].buf,
					 rdwr_pa[i].len))
				res = -EFAULT;
		}
		kfree(rdwr_pa[i].buf);
	}
	kfree(data_ptrs);
	kfree(rdwr_pa);
	return res;
}

Contributors
Person
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CommitProp
Linus Torvalds (pre-git)
235
49.58%
3
23.08%
Jean Delvare
157
33.12%
4
30.77%
Greg Kroah-Hartman
63
13.29%
3
23.08%
Julia Lawall
10
2.11%
1
7.69%
Thomas Meyer
8
1.69%
1
7.69%
Mark M. Hoffman
1
0.21%
1
7.69%
Total
474
100.00%
13
100.00%



static noinline int i2cdev_ioctl_smbus(struct i2c_client *client,
		unsigned long arg)
{
	struct i2c_smbus_ioctl_data data_arg;
	union i2c_smbus_data temp = {};
	int datasize, res;

	if (copy_from_user(&data_arg,
			   (struct i2c_smbus_ioctl_data __user *) arg,
			   sizeof(struct i2c_smbus_ioctl_data)))
		return -EFAULT;
	if ((data_arg.size != I2C_SMBUS_BYTE) &&
	    (data_arg.size != I2C_SMBUS_QUICK) &&
	    (data_arg.size != I2C_SMBUS_BYTE_DATA) &&
	    (data_arg.size != I2C_SMBUS_WORD_DATA) &&
	    (data_arg.size != I2C_SMBUS_PROC_CALL) &&
	    (data_arg.size != I2C_SMBUS_BLOCK_DATA) &&
	    (data_arg.size != I2C_SMBUS_I2C_BLOCK_BROKEN) &&
	    (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) &&
	    (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) {
		dev_dbg(&client->adapter->dev,
			"size out of range (%x) in ioctl I2C_SMBUS.\n",
			data_arg.size);
		return -EINVAL;
	}
	/* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1,
           so the check is valid if size==I2C_SMBUS_QUICK too. */
	if ((data_arg.read_write != I2C_SMBUS_READ) &&
	    (data_arg.read_write != I2C_SMBUS_WRITE)) {
		dev_dbg(&client->adapter->dev,
			"read_write out of range (%x) in ioctl I2C_SMBUS.\n",
			data_arg.read_write);
		return -EINVAL;
	}

	/* Note that command values are always valid! */

	if ((data_arg.size == I2C_SMBUS_QUICK) ||
	    ((data_arg.size == I2C_SMBUS_BYTE) &&
	    (data_arg.read_write == I2C_SMBUS_WRITE)))
		/* These are special: we do not use data */
		return i2c_smbus_xfer(client->adapter, client->addr,
				      client->flags, data_arg.read_write,
				      data_arg.command, data_arg.size, NULL);

	if (data_arg.data == NULL) {
		dev_dbg(&client->adapter->dev,
			"data is NULL pointer in ioctl I2C_SMBUS.\n");
		return -EINVAL;
	}

	if ((data_arg.size == I2C_SMBUS_BYTE_DATA) ||
	    (data_arg.size == I2C_SMBUS_BYTE))
		datasize = sizeof(data_arg.data->byte);
	else if ((data_arg.size == I2C_SMBUS_WORD_DATA) ||
		 (data_arg.size == I2C_SMBUS_PROC_CALL))
		datasize = sizeof(data_arg.data->word);
	else /* size == smbus block, i2c block, or block proc. call */
		datasize = sizeof(data_arg.data->block);

	if ((data_arg.size == I2C_SMBUS_PROC_CALL) ||
	    (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) ||
	    (data_arg.size == I2C_SMBUS_I2C_BLOCK_DATA) ||
	    (data_arg.read_write == I2C_SMBUS_WRITE)) {
		if (copy_from_user(&temp, data_arg.data, datasize))
			return -EFAULT;
	}
	if (data_arg.size == I2C_SMBUS_I2C_BLOCK_BROKEN) {
		/* Convert old I2C block commands to the new
                   convention. This preserves binary compatibility. */
		data_arg.size = I2C_SMBUS_I2C_BLOCK_DATA;
		if (data_arg.read_write == I2C_SMBUS_READ)
			temp.block[0] = I2C_SMBUS_BLOCK_MAX;
	}
	res = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
	      data_arg.read_write, data_arg.command, data_arg.size, &temp);
	if (!res && ((data_arg.size == I2C_SMBUS_PROC_CALL) ||
		     (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) ||
		     (data_arg.read_write == I2C_SMBUS_READ))) {
		if (copy_to_user(data_arg.data, &temp, datasize))
			return -EFAULT;
	}
	return res;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
391
74.33%
4
36.36%
Jean Delvare
86
16.35%
3
27.27%
Albert Cranford
25
4.75%
1
9.09%
Greg Kroah-Hartman
22
4.18%
2
18.18%
Vlad Tsyrklevich
2
0.38%
1
9.09%
Total
526
100.00%
11
100.00%



static long i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct i2c_client *client = file->private_data;
	unsigned long funcs;

	dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n",
		cmd, arg);

	switch (cmd) {
	case I2C_SLAVE:
	case I2C_SLAVE_FORCE:
		if ((arg > 0x3ff) ||
		    (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f))
			return -EINVAL;
		if (cmd == I2C_SLAVE && i2cdev_check_addr(client->adapter, arg))
			return -EBUSY;
		/* REVISIT: address could become busy later */
		client->addr = arg;
		return 0;
	case I2C_TENBIT:
		if (arg)
			client->flags |= I2C_M_TEN;
		else
			client->flags &= ~I2C_M_TEN;
		return 0;
	case I2C_PEC:
		/*
                 * Setting the PEC flag here won't affect kernel drivers,
                 * which will be using the i2c_client node registered with
                 * the driver model core.  Likewise, when that client has
                 * the PEC flag already set, the i2c-dev driver won't see
                 * (or use) this setting.
                 */
		if (arg)
			client->flags |= I2C_CLIENT_PEC;
		else
			client->flags &= ~I2C_CLIENT_PEC;
		return 0;
	case I2C_FUNCS:
		funcs = i2c_get_functionality(client->adapter);
		return put_user(funcs, (unsigned long __user *)arg);

	case I2C_RDWR:
		return i2cdev_ioctl_rdwr(client, arg);

	case I2C_SMBUS:
		return i2cdev_ioctl_smbus(client, arg);

	case I2C_RETRIES:
		client->adapter->retries = arg;
		break;
	case I2C_TIMEOUT:
		/* For historical reasons, user-space sets the timeout
                 * value in units of 10 ms.
                 */
		client->adapter->timeout = msecs_to_jiffies(arg * 10);
		break;
	default:
		/* NOTE:  returning a fault code here could cause trouble
                 * in buggy userspace code.  Some old kernel bugs returned
                 * zero in this case, and userspace code might accidentally
                 * have depended on that bug.
                 */
		return -ENOTTY;
	}
	return 0;
}

Contributors
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CommitProp
Jean Delvare
219
85.88%
4
57.14%
David Brownell
27
10.59%
1
14.29%
Linus Torvalds (pre-git)
8
3.14%
1
14.29%
Alan Cox
1
0.39%
1
14.29%
Total
255
100.00%
7
100.00%



static int i2cdev_open(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	struct i2c_client *client;
	struct i2c_adapter *adap;

	adap = i2c_get_adapter(minor);
	if (!adap)
		return -ENODEV;

	/* This creates an anonymous i2c_client, which may later be
         * pointed to some address using I2C_SLAVE or I2C_SLAVE_FORCE.
         *
         * This client is ** NEVER REGISTERED ** with the driver model
         * or I2C core code!!  It just holds private copies of addressing
         * information and maybe a PEC flag.
         */
	client = kzalloc(sizeof(*client), GFP_KERNEL);
	if (!client) {
		i2c_put_adapter(adap);
		return -ENOMEM;
	}
	snprintf(client->name, I2C_NAME_SIZE, "i2c-dev %d", adap->nr);

	client->adapter = adap;
	file->private_data = client;

	return 0;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
59
53.15%
1
10.00%
Gerd Knorr
20
18.02%
1
10.00%
Jean Delvare
12
10.81%
1
10.00%
Christoph Hellwig
11
9.91%
2
20.00%
Vincent Sanders
5
4.50%
1
10.00%
Greg Kroah-Hartman
1
0.90%
1
10.00%
Viresh Kumar
1
0.90%
1
10.00%
Al Viro
1
0.90%
1
10.00%
David Brownell
1
0.90%
1
10.00%
Total
111
100.00%
10
100.00%



static int i2cdev_release(struct inode *inode, struct file *file)
{
	struct i2c_client *client = file->private_data;

	i2c_put_adapter(client->adapter);
	kfree(client);
	file->private_data = NULL;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Greg Kroah-Hartman
30
65.22%
1
25.00%
Linus Torvalds (pre-git)
15
32.61%
2
50.00%
Christoph Hellwig
1
2.17%
1
25.00%
Total
46
100.00%
4
100.00%


static const struct file_operations i2cdev_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.read		= i2cdev_read,
	.write		= i2cdev_write,
	.unlocked_ioctl	= i2cdev_ioctl,
	.open		= i2cdev_open,
	.release	= i2cdev_release,
};

/* ------------------------------------------------------------------------- */


static struct class *i2c_dev_class;



static int i2cdev_attach_adapter(struct device *dev, void *dummy)
{
	struct i2c_adapter *adap;
	struct i2c_dev *i2c_dev;
	int res;

	if (dev->type != &i2c_adapter_type)
		return 0;
	adap = to_i2c_adapter(dev);

	i2c_dev = get_free_i2c_dev(adap);
	if (IS_ERR(i2c_dev))
		return PTR_ERR(i2c_dev);

	cdev_init(&i2c_dev->cdev, &i2cdev_fops);
	i2c_dev->cdev.owner = THIS_MODULE;
	res = cdev_add(&i2c_dev->cdev, MKDEV(I2C_MAJOR, adap->nr), 1);
	if (res)
		goto error_cdev;

	/* register this i2c device with the driver core */
	i2c_dev->dev = device_create(i2c_dev_class, &adap->dev,
				     MKDEV(I2C_MAJOR, adap->nr), NULL,
				     "i2c-%d", adap->nr);
	if (IS_ERR(i2c_dev->dev)) {
		res = PTR_ERR(i2c_dev->dev);
		goto error;
	}

	pr_debug("i2c-dev: adapter [%s] registered as minor %d\n",
		 adap->name, adap->nr);
	return 0;
error:
	cdev_del(&i2c_dev->cdev);
error_cdev:
	put_i2c_dev(i2c_dev);
	return res;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Greg Kroah-Hartman
62
30.24%
6
37.50%
Erico Nunes
57
27.80%
1
6.25%
Jean Delvare
56
27.32%
4
25.00%
Linus Torvalds (pre-git)
11
5.37%
1
6.25%
Akinobu Mita
9
4.39%
1
6.25%
Kay Sievers
6
2.93%
1
6.25%
Gerd Knorr
3
1.46%
1
6.25%
Wolfram Sang
1
0.49%
1
6.25%
Total
205
100.00%
16
100.00%



static int i2cdev_detach_adapter(struct device *dev, void *dummy)
{
	struct i2c_adapter *adap;
	struct i2c_dev *i2c_dev;

	if (dev->type != &i2c_adapter_type)
		return 0;
	adap = to_i2c_adapter(dev);

	i2c_dev = i2c_dev_get_by_minor(adap->nr);
	if (!i2c_dev) /* attach_adapter must have failed */
		return 0;

	cdev_del(&i2c_dev->cdev);
	put_i2c_dev(i2c_dev);
	device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));

	pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jean Delvare
41
40.59%
4
30.77%
Greg Kroah-Hartman
27
26.73%
4
30.77%
Linus Torvalds (pre-git)
12
11.88%
2
15.38%
Gerd Knorr
12
11.88%
1
7.69%
Dan Carpenter
8
7.92%
1
7.69%
Wolfram Sang
1
0.99%
1
7.69%
Total
101
100.00%
13
100.00%



static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action,
			 void *data)
{
	struct device *dev = data;

	switch (action) {
	case BUS_NOTIFY_ADD_DEVICE:
		return i2cdev_attach_adapter(dev, NULL);
	case BUS_NOTIFY_DEL_DEVICE:
		return i2cdev_detach_adapter(dev, NULL);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jean Delvare
56
98.25%
1
50.00%
Shubhrajyoti Datta
1
1.75%
1
50.00%
Total
57
100.00%
2
100.00%


static struct notifier_block i2cdev_notifier = {
	.notifier_call = i2cdev_notifier_call,
};

/* ------------------------------------------------------------------------- */

/*
 * module load/unload record keeping
 */



static int __init i2c_dev_init(void)
{
	int res;

	printk(KERN_INFO "i2c /dev entries driver\n");

	res = register_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS, "i2c");
	if (res)
		goto out;

	i2c_dev_class = class_create(THIS_MODULE, "i2c-dev");
	if (IS_ERR(i2c_dev_class)) {
		res = PTR_ERR(i2c_dev_class);
		goto out_unreg_chrdev;
	}
	i2c_dev_class->dev_groups = i2c_groups;

	/* Keep track of adapters which will be added or removed later */
	res = bus_register_notifier(&i2c_bus_type, &i2cdev_notifier);
	if (res)
		goto out_unreg_class;

	/* Bind to already existing adapters right away */
	i2c_for_each_dev(NULL, i2cdev_attach_adapter);

	return 0;

out_unreg_class:
	class_destroy(i2c_dev_class);
out_unreg_chrdev:
	unregister_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS);
out:
	printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__);
	return res;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Luiz Fernando N. Capitulino
38
27.34%
1
7.69%
Linus Torvalds (pre-git)
22
15.83%
2
15.38%
Erico Nunes
15
10.79%
1
7.69%
Greg Kroah-Hartman
15
10.79%
3
23.08%
Jean Delvare
15
10.79%
2
15.38%
Albert Cranford
12
8.63%
1
7.69%
Sven Wegener
9
6.47%
1
7.69%
Al Viro
7
5.04%
1
7.69%
Guenter Roeck
6
4.32%
1
7.69%
Total
139
100.00%
13
100.00%



static void __exit i2c_dev_exit(void)
{
	bus_unregister_notifier(&i2c_bus_type, &i2cdev_notifier);
	i2c_for_each_dev(NULL, i2cdev_detach_adapter);
	class_destroy(i2c_dev_class);
	unregister_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jean Delvare
12
28.57%
1
16.67%
Christoph Hellwig
9
21.43%
1
16.67%
Pavel Machek
9
21.43%
1
16.67%
Erico Nunes
7
16.67%
1
16.67%
Greg Kroah-Hartman
5
11.90%
2
33.33%
Total
42
100.00%
6
100.00%

MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
		"Simon G. Vogl <simon@tk.uni-linz.ac.at>");
MODULE_DESCRIPTION("I2C /dev entries driver");
MODULE_LICENSE("GPL");


module_init(i2c_dev_init);

module_exit(i2c_dev_exit);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
984
34.18%
5
6.49%
Jean Delvare
813
28.24%
19
24.68%
Greg Kroah-Hartman
469
16.29%
13
16.88%
Michael Lawnick
131
4.55%
1
1.30%
Erico Nunes
87
3.02%
1
1.30%
David Brownell
85
2.95%
4
5.19%
Albert Cranford
45
1.56%
2
2.60%
Luiz Fernando N. Capitulino
38
1.32%
1
1.30%
Gerd Knorr
36
1.25%
1
1.30%
Guenter Roeck
28
0.97%
1
1.30%
Christoph Hellwig
21
0.73%
3
3.90%
Dave Jones
20
0.69%
1
1.30%
Al Viro
16
0.56%
3
3.90%
Julia Lawall
16
0.56%
1
1.30%
Wolfram Sang
14
0.49%
3
3.90%
Pavel Machek
10
0.35%
1
1.30%
Akinobu Mita
9
0.31%
1
1.30%
Sven Wegener
9
0.31%
1
1.30%
Thomas Meyer
8
0.28%
1
1.30%
Dan Carpenter
8
0.28%
1
1.30%
Kay Sievers
6
0.21%
1
1.30%
Vincent Sanders
5
0.17%
1
1.30%
Linus Torvalds
5
0.17%
1
1.30%
Thomas Gleixner
4
0.14%
1
1.30%
Alan Cox
2
0.07%
1
1.30%
Mark M. Hoffman
2
0.07%
1
1.30%
Vlad Tsyrklevich
2
0.07%
1
1.30%
Arjan van de Ven
1
0.03%
1
1.30%
Shubhrajyoti Datta
1
0.03%
1
1.30%
Viresh Kumar
1
0.03%
1
1.30%
Farid Hammane
1
0.03%
1
1.30%
Deepak Saxena
1
0.03%
1
1.30%
Art Haas
1
0.03%
1
1.30%
Total
2879
100.00%
77
100.00%
Directory: drivers/i2c

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