int xeno_i2c_ioctl(unsigned int cmd, unsigned long arg) {
switch (cmd) {
case I2C_SLAVE:
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;
default:
return i2c_control(client, cmd, arg);
}
return 0;
}
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 **data_ptrs;
int i,datasize,res;
unsigned long funcs;
#ifdef DEBUG
printk(KERN_DEBUG "i2c-dev.o: i2c-%d ioctl, cmd: 0x%x, arg: %lx.\n",
MINOR(inode->i_rdev),cmd, arg);
#endif /* DEBUG */
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_FUNCS:
funcs = i2c_get_functionality(client->adapter);
return (copy_to_user((unsigned long *)arg,&funcs,
sizeof(unsigned long)))?-EFAULT:0;
case I2C_RDWR:
if (copy_from_user(&rdwr_arg,
(struct i2c_rdwr_ioctl_data *)arg,
sizeof(rdwr_arg)))
return -EFAULT;
/* Put an arbritrary limit on the number of messages that can
* be sent at once */
if (rdwr_arg.nmsgs > 42)
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 = (u8 **) kmalloc(rdwr_arg.nmsgs * sizeof(u8 *),
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] = 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 *) 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)) {
#ifdef DEBUG
printk(KERN_DEBUG "i2c-dev.o: size out of range (%x) in ioctl I2C_SMBUS.\n",
data_arg.size);
#endif
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)) {
#ifdef DEBUG
printk(KERN_DEBUG "i2c-dev.o: read_write out of range (%x) in ioctl I2C_SMBUS.\n",
data_arg.read_write);
#endif
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) {
#ifdef DEBUG
printk(KERN_DEBUG "i2c-dev.o: data is NULL pointer in ioctl I2C_SMBUS.\n");
#endif
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 == I2C_SMBUS_BLOCK_DATA */
datasize = sizeof(data_arg.data->block);
if ((data_arg.size == I2C_SMBUS_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.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;
}
