| Message ID | 7AAC1BF4-8B60-448D-A3C1-B7E80330BE42@live.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | USB: Simplify running code on shutdown for USB devices | expand |
On Sat, Jul 06, 2024 at 12:03:23PM +0000, Aditya Garg wrote: > From: Kerem Karabay <kekrby@gmail.com> > > 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> Where did Kerem do this work? Any reason why they aren't submitting these themselves? Not that this is a problem, just trying to figure out what went wrong with the development process here. thanks, greg k-h
> On 6 Jul 2024, at 6:06 PM, gregkh@linuxfoundation.org wrote: > > On Sat, Jul 06, 2024 at 12:03:23PM +0000, Aditya Garg wrote: >> From: Kerem Karabay <kekrby@gmail.com> >> >> 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> > > Where did Kerem do this work? Any reason why they aren't submitting > these themselves? Not that this is a problem, just trying to figure out > what went wrong with the development process here. I work at https://t2linux.org/, a project aimed to bring Linux to T2 Macs. Kerem helped in developing the driver for the Touch Bar on these Macs. During development, he did some improvements to the HID core, USB core and DRM, which are not specific to the Macs, but are used in the driver. As to why he didn't submit himself, unfortunately Kerem seems to have left the project and is not contactable at all. Fortunately, the patches he contributed were signed off by him. Since we have his Signed-off-by and the code is GPL2, IMO, I can legally submit this. Link to our patchset: https://github.com/t2linux/linux-t2-patches > > thanks, > > greg k-h
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index e02ba15f6..b35734d03 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -517,6 +517,19 @@ static int usb_unbind_interface(struct device *dev) 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 * @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.probe = usb_probe_interface; new_driver->driver.remove = usb_unbind_interface; + new_driver->driver.shutdown = usb_shutdown_interface; new_driver->driver.owner = owner; new_driver->driver.mod_name = mod_name; new_driver->driver.dev_groups = new_driver->dev_groups; diff --git a/include/linux/usb.h b/include/linux/usb.h index 1913a1383..832997a9d 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -1171,6 +1171,7 @@ extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf); * post_reset method is called. * @post_reset: Called by usb_reset_device() after the device * has been reset + * @shutdown: Called at shut-down time to quiesce the device. * @id_table: USB drivers use ID table to support hotplugging. * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set * 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 (*post_reset)(struct usb_interface *intf); + void (*shutdown)(struct usb_interface *intf); + const struct usb_device_id *id_table; const struct attribute_group **dev_groups;