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i2c: Export i2c_for_each_dev 

Introduce i2c_for_each_dev(), an i2c device iterator with proper
locking for use by i2c-dev. This is needed so that we can get rid of
the attach_adapter and detach_adapter legacy callback functions.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2011-03-20 14:50:52 +01:00 committed by Jean Delvare
parent 0c31f8e572
commit 7ae31482a8
2 changed files with 16 additions and 6 deletions
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20
drivers/i2c/i2c-core.c
View File

@ -1091,6 +1091,18 @@ EXPORT_SYMBOL(i2c_del_adapter);
/* ------------------------------------------------------------------------- */
int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *))
{
int res;
mutex_lock(&core_lock);
res = bus_for_each_dev(&i2c_bus_type, NULL, data, fn);
mutex_unlock(&core_lock);
return res;
}
EXPORT_SYMBOL_GPL(i2c_for_each_dev);
static int __process_new_driver(struct device *dev, void *data)
{
if (dev->type != &i2c_adapter_type)
@ -1134,9 +1146,7 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
INIT_LIST_HEAD(&driver->clients);
/* Walk the adapters that are already present */
mutex_lock(&core_lock);
bus_for_each_dev(&i2c_bus_type, NULL, driver, __process_new_driver);
mutex_unlock(&core_lock);
i2c_for_each_dev(driver, __process_new_driver);
return 0;
}
@ -1156,9 +1166,7 @@ static int __process_removed_driver(struct device *dev, void *data)
*/
void i2c_del_driver(struct i2c_driver *driver)
{
mutex_lock(&core_lock);
bus_for_each_dev(&i2c_bus_type, NULL, driver, __process_removed_driver);
mutex_unlock(&core_lock);
i2c_for_each_dev(driver, __process_removed_driver);
driver_unregister(&driver->driver);
pr_debug("i2c-core: driver [%s] unregistered\n", driver->driver.name);

2
include/linux/i2c.h
View File

@ -395,6 +395,8 @@ i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter)
return NULL;
}
int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *));
/* Adapter locking functions, exported for shared pin cases */
void i2c_lock_adapter(struct i2c_adapter *);
void i2c_unlock_adapter(struct i2c_adapter *);