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USB: core: add 'shutdown' callback to usb_driver

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Currently there is no standardized method for USB drivers to handle
shutdown events. This patch simplifies running code on shutdown for USB
devices by adding a shutdown callback to usb_driver.

Signed-off-by: Kerem Karabay <kekrby@gmail.com>
Signed-off-by: Aditya Garg <gargaditya08@live.com>
Link: https://lore.kernel.org/r/7AAC1BF4-8B60-448D-A3C1-B7E80330BE42@live.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kerem Karabay 2024-07-06 12:03:23 +00:00 committed by Greg Kroah-Hartman
parent 41ea26a06a
commit a5f81642a7
2 changed files with 17 additions and 0 deletions
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14
drivers/usb/core/driver.c
View File

@ -517,6 +517,19 @@ static int usb_unbind_interface(struct device *dev)
return 0; return 0;
} }
static void usb_shutdown_interface(struct device *dev)
{
struct usb_interface *intf = to_usb_interface(dev);
struct usb_driver *driver;
if (!dev->driver)
return;
driver = to_usb_driver(dev->driver);
if (driver->shutdown)
driver->shutdown(intf);
}
/** /**
* usb_driver_claim_interface - bind a driver to an interface * usb_driver_claim_interface - bind a driver to an interface
* @driver: the driver to be bound * @driver: the driver to be bound
@ -1059,6 +1072,7 @@ int usb_register_driver(struct usb_driver *new_driver, struct module *owner,
new_driver->driver.bus = &usb_bus_type; new_driver->driver.bus = &usb_bus_type;
new_driver->driver.probe = usb_probe_interface; new_driver->driver.probe = usb_probe_interface;
new_driver->driver.remove = usb_unbind_interface; new_driver->driver.remove = usb_unbind_interface;
new_driver->driver.shutdown = usb_shutdown_interface;
new_driver->driver.owner = owner; new_driver->driver.owner = owner;
new_driver->driver.mod_name = mod_name; new_driver->driver.mod_name = mod_name;
new_driver->driver.dev_groups = new_driver->dev_groups; new_driver->driver.dev_groups = new_driver->dev_groups;

3
include/linux/usb.h
View File

@ -1171,6 +1171,7 @@ extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf);
* post_reset method is called. * post_reset method is called.
* @post_reset: Called by usb_reset_device() after the device * @post_reset: Called by usb_reset_device() after the device
* has been reset * has been reset
* @shutdown: Called at shut-down time to quiesce the device.
* @id_table: USB drivers use ID table to support hotplugging. * @id_table: USB drivers use ID table to support hotplugging.
* Export this with MODULE_DEVICE_TABLE(usb,...). This must be set * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set
* or your driver's probe function will never get called. * or your driver's probe function will never get called.
@ -1222,6 +1223,8 @@ struct usb_driver {
int (*pre_reset)(struct usb_interface *intf); int (*pre_reset)(struct usb_interface *intf);
int (*post_reset)(struct usb_interface *intf); int (*post_reset)(struct usb_interface *intf);
void (*shutdown)(struct usb_interface *intf);
const struct usb_device_id *id_table; const struct usb_device_id *id_table;
const struct attribute_group **dev_groups; const struct attribute_group **dev_groups;