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i2c: Change prototypes of refcounting functions

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Use more standard prototypes for i2c_use_client() and
i2c_release_client(). The former now returns a pointer to the client,
and the latter no longer returns anything. This matches what all other
subsystems do.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: David Brownell <david-b@pacbell.net>
This commit is contained in:
Jean Delvare 2008-01-27 18:14:48 +01:00 committed by Jean Delvare
parent bdc511f438
commit e48d33193d
3 changed files with 26 additions and 27 deletions
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24
drivers/i2c/i2c-core.c
View File

@ -764,17 +764,33 @@ int i2c_detach_client(struct i2c_client *client)
}
EXPORT_SYMBOL(i2c_detach_client);
int i2c_use_client(struct i2c_client *client)
/**
* i2c_use_client - increments the reference count of the i2c client structure
* @client: the client being referenced
*
* Each live reference to a client should be refcounted. The driver model does
* that automatically as part of driver binding, so that most drivers don't
* need to do this explicitly: they hold a reference until they're unbound
* from the device.
*
* A pointer to the client with the incremented reference counter is returned.
*/
struct i2c_client *i2c_use_client(struct i2c_client *client)
{
get_device(&client->dev);
return 0;
return client;
}
EXPORT_SYMBOL(i2c_use_client);
int i2c_release_client(struct i2c_client *client)
/**
* i2c_release_client - release a use of the i2c client structure
* @client: the client being no longer referenced
*
* Must be called when a user of a client is finished with it.
*/
void i2c_release_client(struct i2c_client *client)
{
put_device(&client->dev);
return 0;
}
EXPORT_SYMBOL(i2c_release_client);

22
drivers/media/video/vino.c
View File

@ -2589,11 +2589,7 @@ static int vino_acquire_input(struct vino_channel_settings *vcs)
/* First try D1 and then SAA7191 */
if (vino_drvdata->camera.driver
&& (vino_drvdata->camera.owner == VINO_NO_CHANNEL)) {
if (i2c_use_client(vino_drvdata->camera.driver)) {
ret = -ENODEV;
goto out;
}
i2c_use_client(vino_drvdata->camera.driver);
vino_drvdata->camera.owner = vcs->channel;
vcs->input = VINO_INPUT_D1;
vcs->data_norm = VINO_DATA_NORM_D1;
@ -2602,11 +2598,7 @@ static int vino_acquire_input(struct vino_channel_settings *vcs)
int input, data_norm;
int saa7191_input;
if (i2c_use_client(vino_drvdata->decoder.driver)) {
ret = -ENODEV;
goto out;
}
i2c_use_client(vino_drvdata->decoder.driver);
input = VINO_INPUT_COMPOSITE;
saa7191_input = vino_get_saa7191_input(input);
@ -2688,10 +2680,7 @@ static int vino_set_input(struct vino_channel_settings *vcs, int input)
}
if (vino_drvdata->decoder.owner == VINO_NO_CHANNEL) {
if (i2c_use_client(vino_drvdata->decoder.driver)) {
ret = -ENODEV;
goto out;
}
i2c_use_client(vino_drvdata->decoder.driver);
vino_drvdata->decoder.owner = vcs->channel;
}
@ -2759,10 +2748,7 @@ static int vino_set_input(struct vino_channel_settings *vcs, int input)
}
if (vino_drvdata->camera.owner == VINO_NO_CHANNEL) {
if (i2c_use_client(vino_drvdata->camera.driver)) {
ret = -ENODEV;
goto out;
}
i2c_use_client(vino_drvdata->camera.driver);
vino_drvdata->camera.owner = vcs->channel;
}

7
include/linux/i2c.h
View File

@ -386,11 +386,8 @@ static inline int i2c_add_driver(struct i2c_driver *driver)
extern int i2c_attach_client(struct i2c_client *);
extern int i2c_detach_client(struct i2c_client *);
/* Should be used to make sure that client-struct is valid and that it
is okay to access the i2c-client.
returns -ENODEV if client has gone in the meantime */
extern int i2c_use_client(struct i2c_client *);
extern int i2c_release_client(struct i2c_client *);
extern struct i2c_client *i2c_use_client(struct i2c_client *client);
extern void i2c_release_client(struct i2c_client *client);
/* call the i2c_client->command() of all attached clients with
* the given arguments */