[deliverable/linux.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/list.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include <asm/uaccess.h>

static struct i2c_driver i2cdev_driver;

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

#define I2C_MINORS	256
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;
}

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;
}

static void return_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);
}

static ssize_t show_adapter_name(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);
}
static 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_path.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_path.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 put_user(funcs, (unsigned long __user *)arg);

	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 = 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->driver = &i2cdev_driver;

	/* 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;
	int res;

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

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

	pr_debug("i2c-dev: adapter [%s] registered as minor %d\n",
		 adap->name, adap->nr);
	return 0;
error_destroy:
	device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
error:
	return_i2c_dev(i2c_dev);
	return res;
}

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) /* attach_adapter must have failed */
		return 0;

	device_remove_file(i2c_dev->dev, &dev_attr_name);
	return_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;
}

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 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	1	/*
438d6c2c	2	i2c-dev.c - i2c-bus driver, char device interface
1da177e4 LT	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	34	#include <linux/init.h>
f3b3aadb	35	#include <linux/list.h>
1da177e4 LT	36	#include <linux/i2c.h>
	37	#include <linux/i2c-dev.h>
	38	#include <asm/uaccess.h>
	39
22f76e74	40	static struct i2c_driver i2cdev_driver;
1da177e4 LT	41
1da177e4 LT	42	struct i2c_dev {
f3b3aadb	43	struct list_head list;
1da177e4	44	struct i2c_adapter *adap;
ac11d060	45	struct device *dev;
1da177e4	46	};
1da177e4 LT	47
1da177e4 LT	48	#define I2C_MINORS 256
f3b3aadb JD	49	static LIST_HEAD(i2c_dev_list);
f3b3aadb JD	50	static DEFINE_SPINLOCK(i2c_dev_list_lock);
1da177e4 LT	51
	52	static struct i2c_dev *i2c_dev_get_by_minor(unsigned index)
	53	{
	54	struct i2c_dev *i2c_dev;
	55
f3b3aadb JD	56	spin_lock(&i2c_dev_list_lock);
	57	list_for_each_entry(i2c_dev, &i2c_dev_list, list) {
	58	if (i2c_dev->adap->nr == index)
	59	goto found;
	60	}
	61	i2c_dev = NULL;
	62	found:
	63	spin_unlock(&i2c_dev_list_lock);
1da177e4 LT	64	return i2c_dev;
	65	}
	66
1da177e4 LT	67	static struct i2c_dev get_free_i2c_dev(struct i2c_adapter adap)
	68	{
	69	struct i2c_dev *i2c_dev;
	70
f3b3aadb JD	71	if (adap->nr >= I2C_MINORS) {
	72	printk(KERN_ERR "i2c-dev: Out of device minors (%d)\n",
	73	adap->nr);
	74	return ERR_PTR(-ENODEV);
	75	}
	76
5263ebb5	77	i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL);
1da177e4 LT	78	if (!i2c_dev)
1da177e4 LT	79	return ERR_PTR(-ENOMEM);
9455e4c9	80	i2c_dev->adap = adap;
f3b3aadb JD	81
	82	spin_lock(&i2c_dev_list_lock);
	83	list_add_tail(&i2c_dev->list, &i2c_dev_list);
	84	spin_unlock(&i2c_dev_list_lock);
1da177e4	85	return i2c_dev;
1da177e4 LT	86	}
	87
	88	static void return_i2c_dev(struct i2c_dev *i2c_dev)
	89	{
f3b3aadb JD	90	spin_lock(&i2c_dev_list_lock);
	91	list_del(&i2c_dev->list);
	92	spin_unlock(&i2c_dev_list_lock);
07125ab2	93	kfree(i2c_dev);
1da177e4 LT	94	}
1da177e4 LT	95
ac11d060 GKH	96	static ssize_t show_adapter_name(struct device *dev,
ac11d060 GKH	97	struct device_attribute attr, char buf)
1da177e4	98	{
ac11d060	99	struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(dev->devt));
79472132 GKH	100
	101	if (!i2c_dev)
	102	return -ENODEV;
1da177e4 LT	103	return sprintf(buf, "%s\n", i2c_dev->adap->name);
1da177e4 LT	104	}
ac11d060	105	static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
1da177e4 LT	106
	107	static ssize_t i2cdev_read (struct file file, char __user buf, size_t count,
	108	loff_t *offset)
	109	{
	110	char *tmp;
	111	int ret;
	112
	113	struct i2c_client client = (struct i2c_client )file->private_data;
	114
	115	if (count > 8192)
	116	count = 8192;
	117
	118	tmp = kmalloc(count,GFP_KERNEL);
	119	if (tmp==NULL)
	120	return -ENOMEM;
	121
	122	pr_debug("i2c-dev: i2c-%d reading %zd bytes.\n",
cba0a128	123	iminor(file->f_path.dentry->d_inode), count);
1da177e4 LT	124
	125	ret = i2c_master_recv(client,tmp,count);
	126	if (ret >= 0)
	127	ret = copy_to_user(buf,tmp,count)?-EFAULT:ret;
	128	kfree(tmp);
	129	return ret;
	130	}
	131
	132	static ssize_t i2cdev_write (struct file file, const char __user buf, size_t count,
	133	loff_t *offset)
	134	{
	135	int ret;
	136	char *tmp;
	137	struct i2c_client client = (struct i2c_client )file->private_data;
	138
	139	if (count > 8192)
	140	count = 8192;
	141
	142	tmp = kmalloc(count,GFP_KERNEL);
	143	if (tmp==NULL)
	144	return -ENOMEM;
	145	if (copy_from_user(tmp,buf,count)) {
	146	kfree(tmp);
	147	return -EFAULT;
	148	}
	149
	150	pr_debug("i2c-dev: i2c-%d writing %zd bytes.\n",
cba0a128	151	iminor(file->f_path.dentry->d_inode), count);
1da177e4 LT	152
	153	ret = i2c_master_send(client,tmp,count);
	154	kfree(tmp);
	155	return ret;
	156	}
	157
	158	static int i2cdev_ioctl(struct inode inode, struct file file,
	159	unsigned int cmd, unsigned long arg)
	160	{
	161	struct i2c_client client = (struct i2c_client )file->private_data;
	162	struct i2c_rdwr_ioctl_data rdwr_arg;
	163	struct i2c_smbus_ioctl_data data_arg;
	164	union i2c_smbus_data temp;
	165	struct i2c_msg *rdwr_pa;
	166	u8 __user **data_ptrs;
	167	int i,datasize,res;
	168	unsigned long funcs;
	169
e8aafcb2 JD	170	dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n",
e8aafcb2 JD	171	cmd, arg);
1da177e4 LT	172
	173	switch ( cmd ) {
	174	case I2C_SLAVE:
	175	case I2C_SLAVE_FORCE:
438d6c2c	176	if ((arg > 0x3ff) \|\|
1da177e4 LT	177	(((client->flags & I2C_M_TEN) == 0) && arg > 0x7f))
	178	return -EINVAL;
	179	if ((cmd == I2C_SLAVE) && i2c_check_addr(client->adapter,arg))
	180	return -EBUSY;
	181	client->addr = arg;
	182	return 0;
	183	case I2C_TENBIT:
	184	if (arg)
	185	client->flags \|= I2C_M_TEN;
	186	else
	187	client->flags &= ~I2C_M_TEN;
	188	return 0;
	189	case I2C_PEC:
	190	if (arg)
	191	client->flags \|= I2C_CLIENT_PEC;
	192	else
	193	client->flags &= ~I2C_CLIENT_PEC;
	194	return 0;
	195	case I2C_FUNCS:
	196	funcs = i2c_get_functionality(client->adapter);
2c003e8e	197	return put_user(funcs, (unsigned long __user *)arg);
1da177e4 LT	198
1da177e4 LT	199	case I2C_RDWR:
438d6c2c DB	200	if (copy_from_user(&rdwr_arg,
438d6c2c DB	201	(struct i2c_rdwr_ioctl_data __user *)arg,
1da177e4 LT	202	sizeof(rdwr_arg)))
	203	return -EFAULT;
	204
d68a861d	205	/* Put an arbitrary limit on the number of messages that can
1da177e4 LT	206	* be sent at once */
	207	if (rdwr_arg.nmsgs > I2C_RDRW_IOCTL_MAX_MSGS)
	208	return -EINVAL;
438d6c2c	209
1da177e4	210	rdwr_pa = (struct i2c_msg *)
438d6c2c	211	kmalloc(rdwr_arg.nmsgs * sizeof(struct i2c_msg),
1da177e4 LT	212	GFP_KERNEL);
	213
	214	if (rdwr_pa == NULL) return -ENOMEM;
	215
	216	if (copy_from_user(rdwr_pa, rdwr_arg.msgs,
	217	rdwr_arg.nmsgs * sizeof(struct i2c_msg))) {
	218	kfree(rdwr_pa);
	219	return -EFAULT;
	220	}
	221
	222	data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL);
	223	if (data_ptrs == NULL) {
	224	kfree(rdwr_pa);
	225	return -ENOMEM;
	226	}
	227
	228	res = 0;
	229	for( i=0; i<rdwr_arg.nmsgs; i++ ) {
	230	/* Limit the size of the message to a sane amount */
	231	if (rdwr_pa[i].len > 8192) {
	232	res = -EINVAL;
	233	break;
	234	}
	235	data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf;
	236	rdwr_pa[i].buf = kmalloc(rdwr_pa[i].len, GFP_KERNEL);
	237	if(rdwr_pa[i].buf == NULL) {
	238	res = -ENOMEM;
	239	break;
	240	}
	241	if(copy_from_user(rdwr_pa[i].buf,
	242	data_ptrs[i],
	243	rdwr_pa[i].len)) {
	244	++i; /* Needs to be kfreed too */
	245	res = -EFAULT;
	246	break;
	247	}
	248	}
	249	if (res < 0) {
	250	int j;
	251	for (j = 0; j < i; ++j)
	252	kfree(rdwr_pa[j].buf);
	253	kfree(data_ptrs);
	254	kfree(rdwr_pa);
	255	return res;
	256	}
	257
	258	res = i2c_transfer(client->adapter,
	259	rdwr_pa,
	260	rdwr_arg.nmsgs);
	261	while(i-- > 0) {
	262	if( res>=0 && (rdwr_pa[i].flags & I2C_M_RD)) {
	263	if(copy_to_user(
	264	data_ptrs[i],
	265	rdwr_pa[i].buf,
	266	rdwr_pa[i].len)) {
	267	res = -EFAULT;
	268	}
	269	}
	270	kfree(rdwr_pa[i].buf);
	271	}
	272	kfree(data_ptrs);
	273	kfree(rdwr_pa);
	274	return res;
	275
276	case I2C_SMBUS:
277	if (copy_from_user(&data_arg,
278	(struct i2c_smbus_ioctl_data __user *) arg,
279	sizeof(struct i2c_smbus_ioctl_data)))
280	return -EFAULT;
438d6c2c	281	if ((data_arg.size != I2C_SMBUS_BYTE) &&
1da177e4	282	(data_arg.size != I2C_SMBUS_QUICK) &&
438d6c2c	283	(data_arg.size != I2C_SMBUS_BYTE_DATA) &&
1da177e4 LT	284	(data_arg.size != I2C_SMBUS_WORD_DATA) &&
	285	(data_arg.size != I2C_SMBUS_PROC_CALL) &&
	286	(data_arg.size != I2C_SMBUS_BLOCK_DATA) &&
	287	(data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) &&
	288	(data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) {
	289	dev_dbg(&client->adapter->dev,
	290	"size out of range (%x) in ioctl I2C_SMBUS.\n",
	291	data_arg.size);
	292	return -EINVAL;
	293	}
438d6c2c	294	/* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1,
1da177e4	295	so the check is valid if size==I2C_SMBUS_QUICK too. */
438d6c2c	296	if ((data_arg.read_write != I2C_SMBUS_READ) &&
1da177e4	297	(data_arg.read_write != I2C_SMBUS_WRITE)) {
438d6c2c	298	dev_dbg(&client->adapter->dev,
1da177e4 LT	299	"read_write out of range (%x) in ioctl I2C_SMBUS.\n",
	300	data_arg.read_write);
	301	return -EINVAL;
	302	}
	303
	304	/* Note that command values are always valid! */
	305
	306	if ((data_arg.size == I2C_SMBUS_QUICK) \|\|
438d6c2c	307	((data_arg.size == I2C_SMBUS_BYTE) &&
1da177e4 LT	308	(data_arg.read_write == I2C_SMBUS_WRITE)))
	309	/* These are special: we do not use data */
	310	return i2c_smbus_xfer(client->adapter, client->addr,
	311	client->flags,
	312	data_arg.read_write,
	313	data_arg.command,
	314	data_arg.size, NULL);
	315
	316	if (data_arg.data == NULL) {
	317	dev_dbg(&client->adapter->dev,
	318	"data is NULL pointer in ioctl I2C_SMBUS.\n");
	319	return -EINVAL;
	320	}
	321
	322	if ((data_arg.size == I2C_SMBUS_BYTE_DATA) \|\|
	323	(data_arg.size == I2C_SMBUS_BYTE))
	324	datasize = sizeof(data_arg.data->byte);
438d6c2c	325	else if ((data_arg.size == I2C_SMBUS_WORD_DATA) \|\|
1da177e4 LT	326	(data_arg.size == I2C_SMBUS_PROC_CALL))
	327	datasize = sizeof(data_arg.data->word);
	328	else /* size == smbus block, i2c block, or block proc. call */
	329	datasize = sizeof(data_arg.data->block);
	330
438d6c2c DB	331	if ((data_arg.size == I2C_SMBUS_PROC_CALL) \|\|
438d6c2c DB	332	(data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) \|\|
1da177e4 LT	333	(data_arg.read_write == I2C_SMBUS_WRITE)) {
	334	if (copy_from_user(&temp, data_arg.data, datasize))
	335	return -EFAULT;
	336	}
	337	res = i2c_smbus_xfer(client->adapter,client->addr,client->flags,
	338	data_arg.read_write,
	339	data_arg.command,data_arg.size,&temp);
438d6c2c DB	340	if (! res && ((data_arg.size == I2C_SMBUS_PROC_CALL) \|\|
438d6c2c DB	341	(data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) \|\|
1da177e4 LT	342	(data_arg.read_write == I2C_SMBUS_READ))) {
	343	if (copy_to_user(data_arg.data, &temp, datasize))
	344	return -EFAULT;
	345	}
	346	return res;
	347
	348	default:
	349	return i2c_control(client,cmd,arg);
	350	}
	351	return 0;
	352	}
	353
	354	static int i2cdev_open(struct inode inode, struct file file)
	355	{
	356	unsigned int minor = iminor(inode);
	357	struct i2c_client *client;
	358	struct i2c_adapter *adap;
	359	struct i2c_dev *i2c_dev;
	360
	361	i2c_dev = i2c_dev_get_by_minor(minor);
	362	if (!i2c_dev)
	363	return -ENODEV;
	364
	365	adap = i2c_get_adapter(i2c_dev->adap->nr);
	366	if (!adap)
	367	return -ENODEV;
	368
22f76e74	369	client = kzalloc(sizeof(*client), GFP_KERNEL);
1da177e4 LT	370	if (!client) {
	371	i2c_put_adapter(adap);
	372	return -ENOMEM;
	373	}
22f76e74 JD	374	snprintf(client->name, I2C_NAME_SIZE, "i2c-dev %d", adap->nr);
22f76e74 JD	375	client->driver = &i2cdev_driver;
1da177e4 LT	376
	377	/* registered with adapter, passed as client to user */
	378	client->adapter = adap;
	379	file->private_data = client;
	380
	381	return 0;
	382	}
	383
	384	static int i2cdev_release(struct inode inode, struct file file)
	385	{
	386	struct i2c_client *client = file->private_data;
	387
	388	i2c_put_adapter(client->adapter);
	389	kfree(client);
	390	file->private_data = NULL;
	391
	392	return 0;
	393	}
	394
	395	static struct file_operations i2cdev_fops = {
	396	.owner = THIS_MODULE,
	397	.llseek = no_llseek,
	398	.read = i2cdev_read,
	399	.write = i2cdev_write,
	400	.ioctl = i2cdev_ioctl,
	401	.open = i2cdev_open,
	402	.release = i2cdev_release,
	403	};
	404
79472132	405	static struct class *i2c_dev_class;
1da177e4 LT	406
	407	static int i2cdev_attach_adapter(struct i2c_adapter *adap)
	408	{
	409	struct i2c_dev *i2c_dev;
defcb46e	410	int res;
1da177e4 LT	411
	412	i2c_dev = get_free_i2c_dev(adap);
	413	if (IS_ERR(i2c_dev))
	414	return PTR_ERR(i2c_dev);
	415
1da177e4	416	/* register this i2c device with the driver core */
ac11d060 GKH	417	i2c_dev->dev = device_create(i2c_dev_class, &adap->dev,
	418	MKDEV(I2C_MAJOR, adap->nr),
	419	"i2c-%d", adap->nr);
3bacb36d AM	420	if (IS_ERR(i2c_dev->dev)) {
3bacb36d AM	421	res = PTR_ERR(i2c_dev->dev);
1da177e4	422	goto error;
defcb46e	423	}
ac11d060	424	res = device_create_file(i2c_dev->dev, &dev_attr_name);
defcb46e JD	425	if (res)
defcb46e JD	426	goto error_destroy;
b32d20dc JD	427
	428	pr_debug("i2c-dev: adapter [%s] registered as minor %d\n",
	429	adap->name, adap->nr);
1da177e4	430	return 0;
defcb46e	431	error_destroy:
ac11d060	432	device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
1da177e4 LT	433	error:
1da177e4 LT	434	return_i2c_dev(i2c_dev);
defcb46e	435	return res;
1da177e4 LT	436	}
	437
	438	static int i2cdev_detach_adapter(struct i2c_adapter *adap)
	439	{
	440	struct i2c_dev *i2c_dev;
	441
9455e4c9	442	i2c_dev = i2c_dev_get_by_minor(adap->nr);
b32d20dc JD	443	if (!i2c_dev) /* attach_adapter must have failed */
b32d20dc JD	444	return 0;
1da177e4	445
ac11d060	446	device_remove_file(i2c_dev->dev, &dev_attr_name);
1da177e4	447	return_i2c_dev(i2c_dev);
ac11d060	448	device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
1da177e4	449
b6d7b3d1	450	pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name);
1da177e4 LT	451	return 0;
	452	}
	453
	454	static int i2cdev_detach_client(struct i2c_client *client)
	455	{
	456	return 0;
	457	}
	458
1da177e4	459	static struct i2c_driver i2cdev_driver = {
35d8b2e6	460	.driver = {
35d8b2e6 LR	461	.name = "dev_driver",
35d8b2e6 LR	462	},
1da177e4	463	.id = I2C_DRIVERID_I2CDEV,
1da177e4 LT	464	.attach_adapter = i2cdev_attach_adapter,
	465	.detach_adapter = i2cdev_detach_adapter,
	466	.detach_client = i2cdev_detach_client,
1da177e4 LT	467	};
1da177e4 LT	468
1da177e4 LT	469	static int __init i2c_dev_init(void)
	470	{
	471	int res;
	472
	473	printk(KERN_INFO "i2c /dev entries driver\n");
	474
	475	res = register_chrdev(I2C_MAJOR, "i2c", &i2cdev_fops);
	476	if (res)
	477	goto out;
	478
79472132 GKH	479	i2c_dev_class = class_create(THIS_MODULE, "i2c-dev");
79472132 GKH	480	if (IS_ERR(i2c_dev_class))
1da177e4 LT	481	goto out_unreg_chrdev;
	482
	483	res = i2c_add_driver(&i2cdev_driver);
	484	if (res)
	485	goto out_unreg_class;
	486
1da177e4 LT	487	return 0;
	488
	489	out_unreg_class:
79472132	490	class_destroy(i2c_dev_class);
1da177e4 LT	491	out_unreg_chrdev:
	492	unregister_chrdev(I2C_MAJOR, "i2c");
	493	out:
	494	printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__);
	495	return res;
	496	}
	497
	498	static void __exit i2c_dev_exit(void)
	499	{
	500	i2c_del_driver(&i2cdev_driver);
79472132	501	class_destroy(i2c_dev_class);
1da177e4 LT	502	unregister_chrdev(I2C_MAJOR,"i2c");
	503	}
	504
	505	MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
	506	"Simon G. Vogl <simon@tk.uni-linz.ac.at>");
	507	MODULE_DESCRIPTION("I2C /dev entries driver");
	508	MODULE_LICENSE("GPL");
	509
	510	module_init(i2c_dev_init);
	511	module_exit(i2c_dev_exit);