PWN-Hunter/android_kernel_xiaomi_sdm845
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i2c: Remove i2c_algorithm.algo_control()

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This removes:

 - An effectively unused hook:  i2c_algorithm.algo_control.

 - The i2c_control() call, used only by i2c-dev to call that
   unused hook or set two barely supported adapter params.

   (That param setting moves into i2c-dev.c ... still iffy
   due to lack of locking, but no other changes.)

As shown by diffstat, this is a net code shrink.  It also reduces the
complexity of the I2C adapter and /dev interfaces.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
David Brownell 2007-10-13 23:56:32 +02:00 committed by Jean Delvare
parent cdeec3cc79
commit 53be795934
3 changed files with 12 additions and 31 deletions
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22
drivers/i2c/i2c-core.c
View File

@ -931,28 +931,6 @@ int i2c_master_recv(struct i2c_client *client, char *buf ,int count)
}
EXPORT_SYMBOL(i2c_master_recv);
int i2c_control(struct i2c_client *client,
unsigned int cmd, unsigned long arg)
{
int ret = 0;
struct i2c_adapter *adap = client->adapter;
dev_dbg(&client->adapter->dev, "i2c ioctl, cmd: 0x%x, arg: %#lx\n", cmd, arg);
switch (cmd) {
case I2C_RETRIES:
adap->retries = arg;
break;
case I2C_TIMEOUT:
adap->timeout = arg;
break;
default:
if (adap->algo->algo_control!=NULL)
ret = adap->algo->algo_control(adap,cmd,arg);
}
return ret;
}
EXPORT_SYMBOL(i2c_control);
/* ----------------------------------------------------
* the i2c address scanning function
* Will not work for 10-bit addresses!

14
drivers/i2c/i2c-dev.c
View File

@ -354,9 +354,19 @@ static int i2cdev_ioctl(struct inode *inode, struct file *file,
return -EFAULT;
}
return res;
case I2C_RETRIES:
client->adapter->retries = arg;
break;
case I2C_TIMEOUT:
client->adapter->timeout = arg;
break;
default:
return i2c_control(client,cmd,arg);
/* NOTE: returning a fault code here could cause trouble
* in buggy userspace code. Some old kernel bugs returned
* zero in this case, and userspace code might accidentally
* have depended on that bug.
*/
return -ENOTTY;
}
return 0;
}

7
include/linux/i2c.h
View File

@ -290,9 +290,6 @@ struct i2c_algorithm {
unsigned short flags, char read_write,
u8 command, int size, union i2c_smbus_data * data);
/* --- ioctl like call to set div. parameters. */
int (*algo_control)(struct i2c_adapter *, unsigned int, unsigned long);
/* To determine what the adapter supports */
u32 (*functionality) (struct i2c_adapter *);
};
@ -416,10 +413,6 @@ extern int i2c_probe(struct i2c_adapter *adapter,
struct i2c_client_address_data *address_data,
int (*found_proc) (struct i2c_adapter *, int, int));
/* An ioctl like call to set div. parameters of the adapter.
*/
extern int i2c_control(struct i2c_client *,unsigned int, unsigned long);
extern struct i2c_adapter* i2c_get_adapter(int id);
extern void i2c_put_adapter(struct i2c_adapter *adap);