[GitHub/mt8127/android_kernel_alcatel_ttab.git] / 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.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* 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/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include <asm/uaccess.h>

static struct i2c_client i2cdev_client_template;

struct i2c_dev {
	struct i2c_adapter *adap;
	struct class_device *class_dev;
};

#define I2C_MINORS	256
static struct i2c_dev *i2c_dev_array[I2C_MINORS];
static DEFINE_SPINLOCK(i2c_dev_array_lock);

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

	spin_lock(&i2c_dev_array_lock);
	i2c_dev = i2c_dev_array[index];
	spin_unlock(&i2c_dev_array_lock);
	return i2c_dev;
}

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

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

	spin_lock(&i2c_dev_array_lock);
	if (i2c_dev_array[adap->nr]) {
		spin_unlock(&i2c_dev_array_lock);
		dev_err(&adap->dev, "i2c-dev already has a device assigned to this adapter\n");
		goto error;
	}
	i2c_dev->adap = adap;
	i2c_dev_array[adap->nr] = i2c_dev;
	spin_unlock(&i2c_dev_array_lock);
	return i2c_dev;
error:
	kfree(i2c_dev);
	return ERR_PTR(-ENODEV);
}

static void return_i2c_dev(struct i2c_dev *i2c_dev)
{
	spin_lock(&i2c_dev_array_lock);
	i2c_dev_array[i2c_dev->adap->nr] = NULL;
	spin_unlock(&i2c_dev_array_lock);
}

static ssize_t show_adapter_name(struct class_device *class_dev, char *buf)
{
	struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(class_dev->devt));

	if (!i2c_dev)
		return -ENODEV;
	return sprintf(buf, "%s\n", i2c_dev->adap->name);
}
static CLASS_DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);

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 = (struct i2c_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 %zd bytes.\n",
		iminor(file->f_dentry->d_inode), count);

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

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 = (struct i2c_client *)file->private_data;

	if (count > 8192)
		count = 8192;

	tmp = kmalloc(count,GFP_KERNEL);
	if (tmp==NULL)
		return -ENOMEM;
	if (copy_from_user(tmp,buf,count)) {
		kfree(tmp);
		return -EFAULT;
	}

	pr_debug("i2c-dev: i2c-%d writing %zd bytes.\n",
		iminor(file->f_dentry->d_inode), count);

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

static int i2cdev_ioctl(struct inode *inode, struct file *file,
		unsigned int cmd, unsigned long arg)
{
	struct i2c_client *client = (struct i2c_client *)file->private_data;
	struct i2c_rdwr_ioctl_data rdwr_arg;
	struct i2c_smbus_ioctl_data data_arg;
	union i2c_smbus_data temp;
	struct i2c_msg *rdwr_pa;
	u8 __user **data_ptrs;
	int i,datasize,res;
	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) && i2c_check_addr(client->adapter,arg))
			return -EBUSY;
		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:
		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 (copy_to_user((unsigned long __user *)arg, &funcs,
		                     sizeof(unsigned long)))?-EFAULT:0;

	case I2C_RDWR:
		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_RDRW_IOCTL_MAX_MSGS)
			return -EINVAL;
		
		rdwr_pa = (struct i2c_msg *)
			kmalloc(rdwr_arg.nmsgs * sizeof(struct i2c_msg), 
			GFP_KERNEL);

		if (rdwr_pa == NULL) return -ENOMEM;

		if (copy_from_user(rdwr_pa, rdwr_arg.msgs,
				   rdwr_arg.nmsgs * sizeof(struct i2c_msg))) {
			kfree(rdwr_pa);
			return -EFAULT;
		}

		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 = kmalloc(rdwr_pa[i].len, GFP_KERNEL);
			if(rdwr_pa[i].buf == NULL) {
				res = -ENOMEM;
				break;
			}
			if(copy_from_user(rdwr_pa[i].buf,
				data_ptrs[i],
				rdwr_pa[i].len)) {
					++i; /* Needs to be kfreed too */
					res = -EFAULT;
				break;
			}
		}
		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;

	case I2C_SMBUS:
		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_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.read_write == I2C_SMBUS_WRITE)) {
			if (copy_from_user(&temp, data_arg.data, datasize))
				return -EFAULT;
		}
		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;

	default:
		return i2c_control(client,cmd,arg);
	}
	return 0;
}

static int i2cdev_open(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	struct i2c_client *client;
	struct i2c_adapter *adap;
	struct i2c_dev *i2c_dev;

	i2c_dev = i2c_dev_get_by_minor(minor);
	if (!i2c_dev)
		return -ENODEV;

	adap = i2c_get_adapter(i2c_dev->adap->nr);
	if (!adap)
		return -ENODEV;

	client = kmalloc(sizeof(*client), GFP_KERNEL);
	if (!client) {
		i2c_put_adapter(adap);
		return -ENOMEM;
	}
	memcpy(client, &i2cdev_client_template, sizeof(*client));

	/* registered with adapter, passed as client to user */
	client->adapter = adap;
	file->private_data = client;

	return 0;
}

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;
}

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

static struct class *i2c_dev_class;

static int i2cdev_attach_adapter(struct i2c_adapter *adap)
{
	struct i2c_dev *i2c_dev;

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

	pr_debug("i2c-dev: adapter [%s] registered as minor %d\n",
		 adap->name, adap->nr);

	/* register this i2c device with the driver core */
	i2c_dev->class_dev = class_device_create(i2c_dev_class, NULL,
						 MKDEV(I2C_MAJOR, adap->nr),
						 &adap->dev, "i2c-%d",
						 adap->nr);
	if (!i2c_dev->class_dev)
		goto error;
	class_device_create_file(i2c_dev->class_dev, &class_device_attr_name);
	return 0;
error:
	return_i2c_dev(i2c_dev);
	kfree(i2c_dev);
	return -ENODEV;
}

static int i2cdev_detach_adapter(struct i2c_adapter *adap)
{
	struct i2c_dev *i2c_dev;

	i2c_dev = i2c_dev_get_by_minor(adap->nr);
	if (!i2c_dev)
		return -ENODEV;

	return_i2c_dev(i2c_dev);
	class_device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
	kfree(i2c_dev);

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

static int i2cdev_detach_client(struct i2c_client *client)
{
	return 0;
}

static struct i2c_driver i2cdev_driver = {
	.driver = {
		.name	= "dev_driver",
	},
	.id		= I2C_DRIVERID_I2CDEV,
	.attach_adapter	= i2cdev_attach_adapter,
	.detach_adapter	= i2cdev_detach_adapter,
	.detach_client	= i2cdev_detach_client,
};

static struct i2c_client i2cdev_client_template = {
	.name		= "I2C /dev entry",
	.addr		= -1,
	.driver		= &i2cdev_driver,
};

static int __init i2c_dev_init(void)
{
	int res;

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

	res = register_chrdev(I2C_MAJOR, "i2c", &i2cdev_fops);
	if (res)
		goto out;

	i2c_dev_class = class_create(THIS_MODULE, "i2c-dev");
	if (IS_ERR(i2c_dev_class))
		goto out_unreg_chrdev;

	res = i2c_add_driver(&i2cdev_driver);
	if (res)
		goto out_unreg_class;

	return 0;

out_unreg_class:
	class_destroy(i2c_dev_class);
out_unreg_chrdev:
	unregister_chrdev(I2C_MAJOR, "i2c");
out:
	printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__);
	return res;
}

static void __exit i2c_dev_exit(void)
{
	i2c_del_driver(&i2cdev_driver);
	class_destroy(i2c_dev_class);
	unregister_chrdev(I2C_MAJOR,"i2c");
}

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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	i2c-dev.c - i2c-bus driver, char device interface
	3
	4	Copyright (C) 1995-97 Simon G. Vogl
	5	Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
	6	Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*/
	22
	23	/* Note that this is a complete rewrite of Simon Vogl's i2c-dev module.
	24	But I have used so much of his original code and ideas that it seems
	25	only fair to recognize him as co-author -- Frodo */
	26
	27	/* The I2C_RDWR ioctl code is written by Kolja Waschk <waschk@telos.de> */
	28
1da177e4 LT	29	#include <linux/kernel.h>
	30	#include <linux/module.h>
	31	#include <linux/fs.h>
	32	#include <linux/slab.h>
	33	#include <linux/smp_lock.h>
1da177e4 LT	34	#include <linux/init.h>
	35	#include <linux/i2c.h>
	36	#include <linux/i2c-dev.h>
	37	#include <asm/uaccess.h>
	38
	39	static struct i2c_client i2cdev_client_template;
	40
	41	struct i2c_dev {
1da177e4	42	struct i2c_adapter *adap;
79472132	43	struct class_device *class_dev;
1da177e4	44	};
1da177e4 LT	45
	46	#define I2C_MINORS 256
	47	static struct i2c_dev *i2c_dev_array[I2C_MINORS];
	48	static DEFINE_SPINLOCK(i2c_dev_array_lock);
	49
	50	static struct i2c_dev *i2c_dev_get_by_minor(unsigned index)
	51	{
	52	struct i2c_dev *i2c_dev;
	53
	54	spin_lock(&i2c_dev_array_lock);
	55	i2c_dev = i2c_dev_array[index];
	56	spin_unlock(&i2c_dev_array_lock);
	57	return i2c_dev;
	58	}
	59
1da177e4 LT	60	static struct i2c_dev get_free_i2c_dev(struct i2c_adapter adap)
	61	{
	62	struct i2c_dev *i2c_dev;
	63
5263ebb5	64	i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL);
1da177e4 LT	65	if (!i2c_dev)
1da177e4 LT	66	return ERR_PTR(-ENOMEM);
1da177e4 LT	67
	68	spin_lock(&i2c_dev_array_lock);
	69	if (i2c_dev_array[adap->nr]) {
	70	spin_unlock(&i2c_dev_array_lock);
	71	dev_err(&adap->dev, "i2c-dev already has a device assigned to this adapter\n");
	72	goto error;
	73	}
9455e4c9	74	i2c_dev->adap = adap;
1da177e4 LT	75	i2c_dev_array[adap->nr] = i2c_dev;
	76	spin_unlock(&i2c_dev_array_lock);
	77	return i2c_dev;
	78	error:
	79	kfree(i2c_dev);
	80	return ERR_PTR(-ENODEV);
	81	}
	82
	83	static void return_i2c_dev(struct i2c_dev *i2c_dev)
	84	{
	85	spin_lock(&i2c_dev_array_lock);
9455e4c9	86	i2c_dev_array[i2c_dev->adap->nr] = NULL;
1da177e4 LT	87	spin_unlock(&i2c_dev_array_lock);
	88	}
	89
	90	static ssize_t show_adapter_name(struct class_device class_dev, char buf)
	91	{
79472132 GKH	92	struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(class_dev->devt));
	93
	94	if (!i2c_dev)
	95	return -ENODEV;
1da177e4 LT	96	return sprintf(buf, "%s\n", i2c_dev->adap->name);
	97	}
	98	static CLASS_DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
	99
	100	static ssize_t i2cdev_read (struct file file, char __user buf, size_t count,
	101	loff_t *offset)
	102	{
	103	char *tmp;
	104	int ret;
	105
	106	struct i2c_client client = (struct i2c_client )file->private_data;
	107
	108	if (count > 8192)
	109	count = 8192;
	110
	111	tmp = kmalloc(count,GFP_KERNEL);
	112	if (tmp==NULL)
	113	return -ENOMEM;
	114
	115	pr_debug("i2c-dev: i2c-%d reading %zd bytes.\n",
	116	iminor(file->f_dentry->d_inode), count);
	117
	118	ret = i2c_master_recv(client,tmp,count);
	119	if (ret >= 0)
	120	ret = copy_to_user(buf,tmp,count)?-EFAULT:ret;
	121	kfree(tmp);
	122	return ret;
	123	}
	124
	125	static ssize_t i2cdev_write (struct file file, const char __user buf, size_t count,
	126	loff_t *offset)
	127	{
	128	int ret;
	129	char *tmp;
	130	struct i2c_client client = (struct i2c_client )file->private_data;
	131
	132	if (count > 8192)
	133	count = 8192;
	134
	135	tmp = kmalloc(count,GFP_KERNEL);
	136	if (tmp==NULL)
	137	return -ENOMEM;
	138	if (copy_from_user(tmp,buf,count)) {
	139	kfree(tmp);
	140	return -EFAULT;
	141	}
	142
	143	pr_debug("i2c-dev: i2c-%d writing %zd bytes.\n",
	144	iminor(file->f_dentry->d_inode), count);
	145
	146	ret = i2c_master_send(client,tmp,count);
	147	kfree(tmp);
	148	return ret;
	149	}
	150
	151	static int i2cdev_ioctl(struct inode inode, struct file file,
	152	unsigned int cmd, unsigned long arg)
	153	{
	154	struct i2c_client client = (struct i2c_client )file->private_data;
	155	struct i2c_rdwr_ioctl_data rdwr_arg;
	156	struct i2c_smbus_ioctl_data data_arg;
	157	union i2c_smbus_data temp;
	158	struct i2c_msg *rdwr_pa;
	159	u8 __user **data_ptrs;
160	int i,datasize,res;
161	unsigned long funcs;
162
e8aafcb2 JD	163	dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n",
e8aafcb2 JD	164	cmd, arg);
1da177e4 LT	165
	166	switch ( cmd ) {
	167	case I2C_SLAVE:
	168	case I2C_SLAVE_FORCE:
	169	if ((arg > 0x3ff) \|\|
	170	(((client->flags & I2C_M_TEN) == 0) && arg > 0x7f))
	171	return -EINVAL;
	172	if ((cmd == I2C_SLAVE) && i2c_check_addr(client->adapter,arg))
	173	return -EBUSY;
	174	client->addr = arg;
	175	return 0;
	176	case I2C_TENBIT:
	177	if (arg)
	178	client->flags \|= I2C_M_TEN;
	179	else
	180	client->flags &= ~I2C_M_TEN;
	181	return 0;
	182	case I2C_PEC:
	183	if (arg)
	184	client->flags \|= I2C_CLIENT_PEC;
	185	else
	186	client->flags &= ~I2C_CLIENT_PEC;
	187	return 0;
	188	case I2C_FUNCS:
	189	funcs = i2c_get_functionality(client->adapter);
	190	return (copy_to_user((unsigned long __user *)arg, &funcs,
	191	sizeof(unsigned long)))?-EFAULT:0;
	192
	193	case I2C_RDWR:
	194	if (copy_from_user(&rdwr_arg,
	195	(struct i2c_rdwr_ioctl_data __user *)arg,
	196	sizeof(rdwr_arg)))
	197	return -EFAULT;
	198
d68a861d	199	/* Put an arbitrary limit on the number of messages that can
1da177e4 LT	200	* be sent at once */
	201	if (rdwr_arg.nmsgs > I2C_RDRW_IOCTL_MAX_MSGS)
	202	return -EINVAL;
	203
	204	rdwr_pa = (struct i2c_msg *)
	205	kmalloc(rdwr_arg.nmsgs * sizeof(struct i2c_msg),
	206	GFP_KERNEL);
	207
	208	if (rdwr_pa == NULL) return -ENOMEM;
	209
	210	if (copy_from_user(rdwr_pa, rdwr_arg.msgs,
	211	rdwr_arg.nmsgs * sizeof(struct i2c_msg))) {
	212	kfree(rdwr_pa);
	213	return -EFAULT;
	214	}
	215
	216	data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL);
	217	if (data_ptrs == NULL) {
	218	kfree(rdwr_pa);
	219	return -ENOMEM;
	220	}
	221
	222	res = 0;
	223	for( i=0; i<rdwr_arg.nmsgs; i++ ) {
	224	/* Limit the size of the message to a sane amount */
	225	if (rdwr_pa[i].len > 8192) {
	226	res = -EINVAL;
	227	break;
	228	}
	229	data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf;
	230	rdwr_pa[i].buf = kmalloc(rdwr_pa[i].len, GFP_KERNEL);
	231	if(rdwr_pa[i].buf == NULL) {
	232	res = -ENOMEM;
	233	break;
	234	}
	235	if(copy_from_user(rdwr_pa[i].buf,
	236	data_ptrs[i],
	237	rdwr_pa[i].len)) {
	238	++i; /* Needs to be kfreed too */
	239	res = -EFAULT;
	240	break;
	241	}
	242	}
	243	if (res < 0) {
	244	int j;
	245	for (j = 0; j < i; ++j)
	246	kfree(rdwr_pa[j].buf);
	247	kfree(data_ptrs);
	248	kfree(rdwr_pa);
	249	return res;
	250	}
	251
	252	res = i2c_transfer(client->adapter,
	253	rdwr_pa,
	254	rdwr_arg.nmsgs);
	255	while(i-- > 0) {
	256	if( res>=0 && (rdwr_pa[i].flags & I2C_M_RD)) {
	257	if(copy_to_user(
	258	data_ptrs[i],
	259	rdwr_pa[i].buf,
	260	rdwr_pa[i].len)) {
	261	res = -EFAULT;
	262	}
	263	}
264	kfree(rdwr_pa[i].buf);
265	}
266	kfree(data_ptrs);
267	kfree(rdwr_pa);
268	return res;
269
270	case I2C_SMBUS:
271	if (copy_from_user(&data_arg,
272	(struct i2c_smbus_ioctl_data __user *) arg,
273	sizeof(struct i2c_smbus_ioctl_data)))
274	return -EFAULT;
275	if ((data_arg.size != I2C_SMBUS_BYTE) &&
276	(data_arg.size != I2C_SMBUS_QUICK) &&
277	(data_arg.size != I2C_SMBUS_BYTE_DATA) &&
278	(data_arg.size != I2C_SMBUS_WORD_DATA) &&
279	(data_arg.size != I2C_SMBUS_PROC_CALL) &&
280	(data_arg.size != I2C_SMBUS_BLOCK_DATA) &&
281	(data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) &&
282	(data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) {
283	dev_dbg(&client->adapter->dev,
284	"size out of range (%x) in ioctl I2C_SMBUS.\n",
285	data_arg.size);
286	return -EINVAL;
287	}
288	/* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1,
289	so the check is valid if size==I2C_SMBUS_QUICK too. */
290	if ((data_arg.read_write != I2C_SMBUS_READ) &&
291	(data_arg.read_write != I2C_SMBUS_WRITE)) {
292	dev_dbg(&client->adapter->dev,
293	"read_write out of range (%x) in ioctl I2C_SMBUS.\n",
294	data_arg.read_write);
295	return -EINVAL;
296	}
297
298	/* Note that command values are always valid! */
299
300	if ((data_arg.size == I2C_SMBUS_QUICK) \|\|
301	((data_arg.size == I2C_SMBUS_BYTE) &&
302	(data_arg.read_write == I2C_SMBUS_WRITE)))
303	/* These are special: we do not use data */
304	return i2c_smbus_xfer(client->adapter, client->addr,
305	client->flags,
306	data_arg.read_write,
307	data_arg.command,
308	data_arg.size, NULL);
309
310	if (data_arg.data == NULL) {
311	dev_dbg(&client->adapter->dev,
312	"data is NULL pointer in ioctl I2C_SMBUS.\n");
313	return -EINVAL;
314	}
315
316	if ((data_arg.size == I2C_SMBUS_BYTE_DATA) \|\|
317	(data_arg.size == I2C_SMBUS_BYTE))
318	datasize = sizeof(data_arg.data->byte);
319	else if ((data_arg.size == I2C_SMBUS_WORD_DATA) \|\|
320	(data_arg.size == I2C_SMBUS_PROC_CALL))
321	datasize = sizeof(data_arg.data->word);
322	else /* size == smbus block, i2c block, or block proc. call */
323	datasize = sizeof(data_arg.data->block);
324
325	if ((data_arg.size == I2C_SMBUS_PROC_CALL) \|\|
326	(data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) \|\|
327	(data_arg.read_write == I2C_SMBUS_WRITE)) {
328	if (copy_from_user(&temp, data_arg.data, datasize))
329	return -EFAULT;
330	}
331	res = i2c_smbus_xfer(client->adapter,client->addr,client->flags,
332	data_arg.read_write,
333	data_arg.command,data_arg.size,&temp);
334	if (! res && ((data_arg.size == I2C_SMBUS_PROC_CALL) \|\|
335	(data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) \|\|
336	(data_arg.read_write == I2C_SMBUS_READ))) {
337	if (copy_to_user(data_arg.data, &temp, datasize))
338	return -EFAULT;
339	}
340	return res;
341
342	default:
343	return i2c_control(client,cmd,arg);
344	}
345	return 0;
346	}
347
348	static int i2cdev_open(struct inode inode, struct file file)
349	{
350	unsigned int minor = iminor(inode);
351	struct i2c_client *client;
352	struct i2c_adapter *adap;
353	struct i2c_dev *i2c_dev;
354
355	i2c_dev = i2c_dev_get_by_minor(minor);
356	if (!i2c_dev)
357	return -ENODEV;
358
359	adap = i2c_get_adapter(i2c_dev->adap->nr);
360	if (!adap)
361	return -ENODEV;
362
363	client = kmalloc(sizeof(*client), GFP_KERNEL);
364	if (!client) {
365	i2c_put_adapter(adap);
366	return -ENOMEM;
367	}
368	memcpy(client, &i2cdev_client_template, sizeof(*client));
369
370	/* registered with adapter, passed as client to user */
371	client->adapter = adap;
372	file->private_data = client;
373
374	return 0;
375	}
376
377	static int i2cdev_release(struct inode inode, struct file file)
378	{
379	struct i2c_client *client = file->private_data;
380
381	i2c_put_adapter(client->adapter);
382	kfree(client);
383	file->private_data = NULL;
384
385	return 0;
386	}
387
388	static struct file_operations i2cdev_fops = {
389	.owner = THIS_MODULE,
390	.llseek = no_llseek,
391	.read = i2cdev_read,
392	.write = i2cdev_write,
393	.ioctl = i2cdev_ioctl,
394	.open = i2cdev_open,
395	.release = i2cdev_release,
396	};
397
79472132	398	static struct class *i2c_dev_class;
1da177e4 LT	399
	400	static int i2cdev_attach_adapter(struct i2c_adapter *adap)
	401	{
	402	struct i2c_dev *i2c_dev;
1da177e4 LT	403
	404	i2c_dev = get_free_i2c_dev(adap);
	405	if (IS_ERR(i2c_dev))
	406	return PTR_ERR(i2c_dev);
	407
b6d7b3d1	408	pr_debug("i2c-dev: adapter [%s] registered as minor %d\n",
9455e4c9	409	adap->name, adap->nr);
1da177e4 LT	410
1da177e4 LT	411	/* register this i2c device with the driver core */
79472132	412	i2c_dev->class_dev = class_device_create(i2c_dev_class, NULL,
9455e4c9 JD	413	MKDEV(I2C_MAJOR, adap->nr),
	414	&adap->dev, "i2c-%d",
	415	adap->nr);
79472132	416	if (!i2c_dev->class_dev)
1da177e4	417	goto error;
79472132	418	class_device_create_file(i2c_dev->class_dev, &class_device_attr_name);
1da177e4 LT	419	return 0;
	420	error:
	421	return_i2c_dev(i2c_dev);
	422	kfree(i2c_dev);
79472132	423	return -ENODEV;
1da177e4 LT	424	}
	425
	426	static int i2cdev_detach_adapter(struct i2c_adapter *adap)
	427	{
	428	struct i2c_dev *i2c_dev;
	429
9455e4c9	430	i2c_dev = i2c_dev_get_by_minor(adap->nr);
1da177e4 LT	431	if (!i2c_dev)
	432	return -ENODEV;
	433
1da177e4	434	return_i2c_dev(i2c_dev);
9455e4c9	435	class_device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
1da177e4 LT	436	kfree(i2c_dev);
1da177e4 LT	437
b6d7b3d1	438	pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name);
1da177e4 LT	439	return 0;
	440	}
	441
	442	static int i2cdev_detach_client(struct i2c_client *client)
	443	{
	444	return 0;
	445	}
	446
1da177e4	447	static struct i2c_driver i2cdev_driver = {
35d8b2e6	448	.driver = {
35d8b2e6 LR	449	.name = "dev_driver",
35d8b2e6 LR	450	},
1da177e4	451	.id = I2C_DRIVERID_I2CDEV,
1da177e4 LT	452	.attach_adapter = i2cdev_attach_adapter,
	453	.detach_adapter = i2cdev_detach_adapter,
	454	.detach_client = i2cdev_detach_client,
1da177e4 LT	455	};
	456
	457	static struct i2c_client i2cdev_client_template = {
	458	.name = "I2C /dev entry",
	459	.addr = -1,
	460	.driver = &i2cdev_driver,
	461	};
	462
	463	static int __init i2c_dev_init(void)
	464	{
	465	int res;
	466
	467	printk(KERN_INFO "i2c /dev entries driver\n");
	468
	469	res = register_chrdev(I2C_MAJOR, "i2c", &i2cdev_fops);
	470	if (res)
	471	goto out;
	472
79472132 GKH	473	i2c_dev_class = class_create(THIS_MODULE, "i2c-dev");
79472132 GKH	474	if (IS_ERR(i2c_dev_class))
1da177e4 LT	475	goto out_unreg_chrdev;
	476
	477	res = i2c_add_driver(&i2cdev_driver);
	478	if (res)
	479	goto out_unreg_class;
	480
1da177e4 LT	481	return 0;
	482
	483	out_unreg_class:
79472132	484	class_destroy(i2c_dev_class);
1da177e4 LT	485	out_unreg_chrdev:
	486	unregister_chrdev(I2C_MAJOR, "i2c");
	487	out:
	488	printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__);
	489	return res;
	490	}
	491
	492	static void __exit i2c_dev_exit(void)
	493	{
	494	i2c_del_driver(&i2cdev_driver);
79472132	495	class_destroy(i2c_dev_class);
1da177e4 LT	496	unregister_chrdev(I2C_MAJOR,"i2c");
	497	}
	498
	499	MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
	500	"Simon G. Vogl <simon@tk.uni-linz.ac.at>");
	501	MODULE_DESCRIPTION("I2C /dev entries driver");
	502	MODULE_LICENSE("GPL");
	503
	504	module_init(i2c_dev_init);
	505	module_exit(i2c_dev_exit);