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i2c: i2c stack can remove() 

More update for new style driver support:  add a remove() method, and
use it in the relevant code paths.

Again, nothing will use this yet since there's nothing to create devices
feeding this infrastructure.

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 2007-05-01 23:26:30 +02:00 committed by Jean Delvare
parent 7b4fbc50fa
commit a1d9e6e49f
2 changed files with 63 additions and 5 deletions
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67
drivers/i2c/i2c-core.c
View File

@ -41,6 +41,7 @@ static LIST_HEAD(drivers);
static DEFINE_MUTEX(core_lists);
static DEFINE_IDR(i2c_adapter_idr);
#define is_newstyle_driver(d) ((d)->probe || (d)->remove)
/* ------------------------------------------------------------------------- */
@ -52,7 +53,7 @@ static int i2c_device_match(struct device *dev, struct device_driver *drv)
/* make legacy i2c drivers bypass driver model probing entirely;
* such drivers scan each i2c adapter/bus themselves.
*/
if (!driver->probe)
if (!is_newstyle_driver(driver))
return 0;
/* new style drivers use the same kind of driver matching policy
@ -100,7 +101,24 @@ static int i2c_device_probe(struct device *dev)
static int i2c_device_remove(struct device *dev)
{
return 0;
struct i2c_client *client = to_i2c_client(dev);
struct i2c_driver *driver;
int status;
if (!dev->driver)
return 0;
driver = to_i2c_driver(dev->driver);
if (driver->remove) {
dev_dbg(dev, "remove\n");
status = driver->remove(client);
} else {
dev->driver = NULL;
status = 0;
}
if (status == 0)
client->driver = NULL;
return status;
}
static void i2c_device_shutdown(struct device *dev)
@ -177,6 +195,26 @@ struct bus_type i2c_bus_type = {
.resume = i2c_device_resume,
};
static void i2c_unregister_device(struct i2c_client *client)
{
struct i2c_adapter *adapter = client->adapter;
struct i2c_driver *driver = client->driver;
if (driver && !is_newstyle_driver(driver)) {
dev_err(&client->dev, "can't unregister devices "
"with legacy drivers\n");
WARN_ON(1);
return;
}
mutex_lock(&adapter->clist_lock);
list_del(&client->list);
mutex_unlock(&adapter->clist_lock);
device_unregister(&client->dev);
}
/* ------------------------------------------------------------------------- */
/* I2C bus adapters -- one roots each I2C or SMBUS segment */
@ -310,9 +348,19 @@ int i2c_del_adapter(struct i2c_adapter *adap)
/* detach any active clients. This must be done first, because
* it can fail; in which case we give up. */
list_for_each_safe(item, _n, &adap->clients) {
client = list_entry(item, struct i2c_client, list);
struct i2c_driver *driver;
if ((res=client->driver->detach_client(client))) {
client = list_entry(item, struct i2c_client, list);
driver = client->driver;
/* new style, follow standard driver model */
if (!driver || is_newstyle_driver(driver)) {
i2c_unregister_device(client);
continue;
}
/* legacy drivers create and remove clients themselves */
if ((res = driver->detach_client(client))) {
dev_err(&adap->dev, "detach_client failed for client "
"[%s] at address 0x%02x\n", client->name,
client->addr);
@ -355,7 +403,7 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
int res;
/* new style driver methods can't mix with legacy ones */
if (driver->probe) {
if (is_newstyle_driver(driver)) {
if (driver->attach_adapter || driver->detach_adapter
|| driver->detach_client) {
printk(KERN_WARNING
@ -392,6 +440,10 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
}
EXPORT_SYMBOL(i2c_register_driver);
/**
* i2c_del_driver - unregister I2C driver
* @driver: the driver being unregistered
*/
int i2c_del_driver(struct i2c_driver *driver)
{
struct list_head *item1, *item2, *_n;
@ -402,6 +454,10 @@ int i2c_del_driver(struct i2c_driver *driver)
mutex_lock(&core_lists);
/* new-style driver? */
if (is_newstyle_driver(driver))
goto unregister;
/* Have a look at each adapter, if clients of this driver are still
* attached. If so, detach them to be able to kill the driver
* afterwards.
@ -434,6 +490,7 @@ int i2c_del_driver(struct i2c_driver *driver)
}
}
unregister:
driver_unregister(&driver->driver);
list_del(&driver->list);
pr_debug("i2c-core: driver [%s] unregistered\n", driver->driver.name);

1
include/linux/i2c.h
View File

@ -130,6 +130,7 @@ struct i2c_driver {
* it's done by infrastructure. (NEW STYLE DRIVERS ONLY)
*/
int (*probe)(struct i2c_client *);
int (*remove)(struct i2c_client *);
/* driver model interfaces that don't relate to enumeration */
void (*shutdown)(struct i2c_client *);