diff options
| author | Bastien Nocera <hadess@hadess.net> | 2023-03-02 11:55:54 +0100 |
|---|---|---|
| committer | Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2023-04-03 13:30:32 +0200 |
| commit | 0a4db185f0788dfc828512d0004c468921bf6c0a (patch) | |
| tree | 9cb7f43786b627a3d111bf21e59a76e76d7f4286 | |
| parent | f98e0640c5c6b8bb00336dae8d06ede862754c28 (diff) | |
USB: core: Add API to change the wireless_status
This adds the API that allows device specific drivers to tell user-space
about whether the wireless device is connected to its receiver dongle.
See "USB: core: Add wireless_status sysfs attribute" for a detailed
explanation of what this attribute should be used for.
Signed-off-by: Bastien Nocera <hadess@hadess.net>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20230302105555.51417-5-hadess@hadess.net
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
| -rw-r--r-- | drivers/usb/core/message.c | 40 | ||||
| -rw-r--r-- | include/linux/usb.h | 5 |
2 files changed, 45 insertions, 0 deletions
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index cc404bb7e8f7..33392a6f4972 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -1908,6 +1908,45 @@ static void __usb_queue_reset_device(struct work_struct *ws) usb_put_intf(iface); /* Undo _get_ in usb_queue_reset_device() */ } +/* + * Internal function to set the wireless_status sysfs attribute + * See usb_set_wireless_status() for more details + */ +static void __usb_wireless_status_intf(struct work_struct *ws) +{ + struct usb_interface *iface = + container_of(ws, struct usb_interface, wireless_status_work); + + device_lock(iface->dev.parent); + if (iface->sysfs_files_created) + usb_update_wireless_status_attr(iface); + device_unlock(iface->dev.parent); + usb_put_intf(iface); /* Undo _get_ in usb_set_wireless_status() */ +} + +/** + * usb_set_wireless_status - sets the wireless_status struct member + * @dev: the device to modify + * @status: the new wireless status + * + * Set the wireless_status struct member to the new value, and emit + * sysfs changes as necessary. + * + * Returns: 0 on success, -EALREADY if already set. + */ +int usb_set_wireless_status(struct usb_interface *iface, + enum usb_wireless_status status) +{ + if (iface->wireless_status == status) + return -EALREADY; + + usb_get_intf(iface); + iface->wireless_status = status; + schedule_work(&iface->wireless_status_work); + + return 0; +} +EXPORT_SYMBOL_GPL(usb_set_wireless_status); /* * usb_set_configuration - Makes a particular device setting be current @@ -2100,6 +2139,7 @@ free_interfaces: intf->dev.type = &usb_if_device_type; intf->dev.groups = usb_interface_groups; INIT_WORK(&intf->reset_ws, __usb_queue_reset_device); + INIT_WORK(&intf->wireless_status_work, __usb_wireless_status_intf); intf->minor = -1; device_initialize(&intf->dev); pm_runtime_no_callbacks(&intf->dev); diff --git a/include/linux/usb.h b/include/linux/usb.h index eee54cc961b4..6dfd59d3d695 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -262,6 +262,7 @@ struct usb_interface { unsigned resetting_device:1; /* true: bandwidth alloc after reset */ unsigned authorized:1; /* used for interface authorization */ enum usb_wireless_status wireless_status; + struct work_struct wireless_status_work; struct device dev; /* interface specific device info */ struct device *usb_dev; @@ -896,6 +897,10 @@ static inline int usb_interface_claimed(struct usb_interface *iface) extern void usb_driver_release_interface(struct usb_driver *driver, struct usb_interface *iface); + +int usb_set_wireless_status(struct usb_interface *iface, + enum usb_wireless_status status); + const struct usb_device_id *usb_match_id(struct usb_interface *interface, const struct usb_device_id *id); extern int usb_match_one_id(struct usb_interface *interface, |