i2c compat ioctls: move to ->compat_ioctl()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 6f638bb..2cab27a 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -35,6 +35,7 @@
#include <linux/notifier.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
+#include <linux/compat.h>
/*
* An i2c_dev represents an i2c_adapter ... an I2C or SMBus master, not a
@@ -238,46 +239,29 @@
}
static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
- unsigned long arg)
+ unsigned nmsgs, struct i2c_msg *msgs)
{
- 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);
+ data_ptrs = kmalloc(nmsgs * sizeof(u8 __user *), GFP_KERNEL);
if (data_ptrs == NULL) {
- kfree(rdwr_pa);
+ kfree(msgs);
return -ENOMEM;
}
res = 0;
- for (i = 0; i < rdwr_arg.nmsgs; i++) {
+ for (i = 0; i < nmsgs; i++) {
/* Limit the size of the message to a sane amount */
- if (rdwr_pa[i].len > 8192) {
+ if (msgs[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);
+ data_ptrs[i] = (u8 __user *)msgs[i].buf;
+ msgs[i].buf = memdup_user(data_ptrs[i], msgs[i].len);
+ if (IS_ERR(msgs[i].buf)) {
+ res = PTR_ERR(msgs[i].buf);
break;
}
@@ -292,121 +276,117 @@
* 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] +
+ if (msgs[i].flags & I2C_M_RECV_LEN) {
+ if (!(msgs[i].flags & I2C_M_RD) ||
+ msgs[i].buf[0] < 1 ||
+ msgs[i].len < msgs[i].buf[0] +
I2C_SMBUS_BLOCK_MAX) {
res = -EINVAL;
break;
}
- rdwr_pa[i].len = rdwr_pa[i].buf[0];
+ msgs[i].len = msgs[i].buf[0];
}
}
if (res < 0) {
int j;
for (j = 0; j < i; ++j)
- kfree(rdwr_pa[j].buf);
+ kfree(msgs[j].buf);
kfree(data_ptrs);
- kfree(rdwr_pa);
+ kfree(msgs);
return res;
}
- res = i2c_transfer(client->adapter, rdwr_pa, rdwr_arg.nmsgs);
+ res = i2c_transfer(client->adapter, msgs, 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))
+ if (res >= 0 && (msgs[i].flags & I2C_M_RD)) {
+ if (copy_to_user(data_ptrs[i], msgs[i].buf,
+ msgs[i].len))
res = -EFAULT;
}
- kfree(rdwr_pa[i].buf);
+ kfree(msgs[i].buf);
}
kfree(data_ptrs);
- kfree(rdwr_pa);
+ kfree(msgs);
return res;
}
static noinline int i2cdev_ioctl_smbus(struct i2c_client *client,
- unsigned long arg)
+ u8 read_write, u8 command, u32 size,
+ union i2c_smbus_data __user *data)
{
- 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)) {
+ if ((size != I2C_SMBUS_BYTE) &&
+ (size != I2C_SMBUS_QUICK) &&
+ (size != I2C_SMBUS_BYTE_DATA) &&
+ (size != I2C_SMBUS_WORD_DATA) &&
+ (size != I2C_SMBUS_PROC_CALL) &&
+ (size != I2C_SMBUS_BLOCK_DATA) &&
+ (size != I2C_SMBUS_I2C_BLOCK_BROKEN) &&
+ (size != I2C_SMBUS_I2C_BLOCK_DATA) &&
+ (size != I2C_SMBUS_BLOCK_PROC_CALL)) {
dev_dbg(&client->adapter->dev,
"size out of range (%x) in ioctl I2C_SMBUS.\n",
- data_arg.size);
+ 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)) {
+ if ((read_write != I2C_SMBUS_READ) &&
+ (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);
+ 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)))
+ if ((size == I2C_SMBUS_QUICK) ||
+ ((size == I2C_SMBUS_BYTE) &&
+ (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);
+ client->flags, read_write,
+ command, size, NULL);
- if (data_arg.data == NULL) {
+ if (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);
+ if ((size == I2C_SMBUS_BYTE_DATA) ||
+ (size == I2C_SMBUS_BYTE))
+ datasize = sizeof(data->byte);
+ else if ((size == I2C_SMBUS_WORD_DATA) ||
+ (size == I2C_SMBUS_PROC_CALL))
+ datasize = sizeof(data->word);
else /* size == smbus block, i2c block, or block proc. call */
- datasize = sizeof(data_arg.data->block);
+ datasize = sizeof(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))
+ if ((size == I2C_SMBUS_PROC_CALL) ||
+ (size == I2C_SMBUS_BLOCK_PROC_CALL) ||
+ (size == I2C_SMBUS_I2C_BLOCK_DATA) ||
+ (read_write == I2C_SMBUS_WRITE)) {
+ if (copy_from_user(&temp, data, datasize))
return -EFAULT;
}
- if (data_arg.size == I2C_SMBUS_I2C_BLOCK_BROKEN) {
+ if (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)
+ size = I2C_SMBUS_I2C_BLOCK_DATA;
+ if (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))
+ read_write, command, size, &temp);
+ if (!res && ((size == I2C_SMBUS_PROC_CALL) ||
+ (size == I2C_SMBUS_BLOCK_PROC_CALL) ||
+ (read_write == I2C_SMBUS_READ))) {
+ if (copy_to_user(data, &temp, datasize))
return -EFAULT;
}
return res;
@@ -454,12 +434,39 @@
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_RDWR: {
+ struct i2c_rdwr_ioctl_data rdwr_arg;
+ struct i2c_msg *rdwr_pa;
- case I2C_SMBUS:
- return i2cdev_ioctl_smbus(client, arg);
+ 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);
+
+ return i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa);
+ }
+
+ case I2C_SMBUS: {
+ struct i2c_smbus_ioctl_data data_arg;
+ if (copy_from_user(&data_arg,
+ (struct i2c_smbus_ioctl_data __user *) arg,
+ sizeof(struct i2c_smbus_ioctl_data)))
+ return -EFAULT;
+ return i2cdev_ioctl_smbus(client, data_arg.read_write,
+ data_arg.command,
+ data_arg.size,
+ data_arg.data);
+ }
case I2C_RETRIES:
client->adapter->retries = arg;
break;
@@ -480,6 +487,90 @@
return 0;
}
+#ifdef CONFIG_COMPAT
+
+struct i2c_smbus_ioctl_data32 {
+ u8 read_write;
+ u8 command;
+ u32 size;
+ compat_caddr_t data; /* union i2c_smbus_data *data */
+};
+
+struct i2c_msg32 {
+ u16 addr;
+ u16 flags;
+ u16 len;
+ compat_caddr_t buf;
+};
+
+struct i2c_rdwr_ioctl_data32 {
+ compat_caddr_t msgs; /* struct i2c_msg __user *msgs */
+ u32 nmsgs;
+};
+
+static long compat_i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct i2c_client *client = file->private_data;
+ unsigned long funcs;
+ switch (cmd) {
+ case I2C_FUNCS:
+ funcs = i2c_get_functionality(client->adapter);
+ return put_user(funcs, (compat_ulong_t __user *)arg);
+ case I2C_RDWR: {
+ struct i2c_rdwr_ioctl_data32 rdwr_arg;
+ struct i2c_msg32 *p;
+ struct i2c_msg *rdwr_pa;
+ int i;
+
+ if (copy_from_user(&rdwr_arg,
+ (struct i2c_rdwr_ioctl_data32 __user *)arg,
+ sizeof(rdwr_arg)))
+ return -EFAULT;
+
+ if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS)
+ return -EINVAL;
+
+ rdwr_pa = kmalloc_array(rdwr_arg.nmsgs, sizeof(struct i2c_msg),
+ GFP_KERNEL);
+ if (!rdwr_pa)
+ return -ENOMEM;
+
+ p = compat_ptr(rdwr_arg.msgs);
+ for (i = 0; i < rdwr_arg.nmsgs; i++) {
+ struct i2c_msg32 umsg;
+ if (copy_from_user(&umsg, p + i, sizeof(umsg))) {
+ kfree(rdwr_pa);
+ return -EFAULT;
+ }
+ rdwr_pa[i] = (struct i2c_msg) {
+ .addr = umsg.addr,
+ .flags = umsg.flags,
+ .len = umsg.len,
+ .buf = compat_ptr(umsg.buf)
+ };
+ }
+
+ return i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa);
+ }
+ case I2C_SMBUS: {
+ struct i2c_smbus_ioctl_data32 data32;
+ if (copy_from_user(&data32,
+ (void __user *) arg,
+ sizeof(data32)))
+ return -EFAULT;
+ return i2cdev_ioctl_smbus(client, data32.read_write,
+ data32.command,
+ data32.size,
+ compat_ptr(data32.data));
+ }
+ default:
+ return i2cdev_ioctl(file, cmd, arg);
+ }
+}
+#else
+#define compat_i2cdev_ioctl NULL
+#endif
+
static int i2cdev_open(struct inode *inode, struct file *file)
{
unsigned int minor = iminor(inode);
@@ -527,6 +618,7 @@
.read = i2cdev_read,
.write = i2cdev_write,
.unlocked_ioctl = i2cdev_ioctl,
+ .compat_ioctl = compat_i2cdev_ioctl,
.open = i2cdev_open,
.release = i2cdev_release,
};