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authorDavid Brownell <david-b@pacbell.net>2007-10-13 23:56:32 +0200
committerJean Delvare <khali@hyperion.delvare>2007-10-13 23:56:32 +0200
commit53be79593452e568a856f8393985131848d59b72 (patch)
treeb1abe8a310486a6c0c146cdaf35f93e1f9faada3 /drivers/i2c
parentcx23885: Drop empty i2c algorithm control callback (diff)
downloadlinux-53be79593452e568a856f8393985131848d59b72.tar.xz
linux-53be79593452e568a856f8393985131848d59b72.zip
i2c: Remove i2c_algorithm.algo_control()
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/i2c-core.c22
-rw-r--r--drivers/i2c/i2c-dev.c14
2 files changed, 12 insertions, 24 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 5e58b5641a35..e73d58c43f38 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -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!
diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index df6e14c192d6..5a15e50748de 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -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;
}