[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/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 class_device *class_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);
}

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 = 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);

	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) {
		res = -ENODEV;
		goto error;
	}
	res = class_device_create_file(i2c_dev->class_dev, &class_device_attr_name);
	if (res)
		goto error_destroy;
	return 0;
error_destroy:
	class_device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
error:
	return_i2c_dev(i2c_dev);
	kfree(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)
		return -ENODEV;

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