diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/driver-api/usb/callbacks.rst (renamed from Documentation/usb/callbacks.txt) | 61 | ||||
| -rw-r--r-- | Documentation/driver-api/usb/index.rst | 1 |
2 files changed, 43 insertions, 19 deletions
diff --git a/Documentation/usb/callbacks.txt b/Documentation/driver-api/usb/callbacks.rst index 9e85846bdb98..93a8d53e27e7 100644 --- a/Documentation/usb/callbacks.txt +++ b/Documentation/driver-api/usb/callbacks.rst @@ -1,3 +1,6 @@ +USB core callbacks +~~~~~~~~~~~~~~~~~~ + What callbacks will usbcore do? =============================== @@ -11,30 +14,42 @@ The callbacks defined in the driver structure are: 1. Hotplugging callbacks: - * @probe: Called to see if the driver is willing to manage a particular - * interface on a device. - * @disconnect: Called when the interface is no longer accessible, usually - * because its device has been (or is being) disconnected or the - * driver module is being unloaded. + - @probe: + Called to see if the driver is willing to manage a particular + interface on a device. + + - @disconnect: + Called when the interface is no longer accessible, usually + because its device has been (or is being) disconnected or the + driver module is being unloaded. 2. Odd backdoor through usbfs: - * @ioctl: Used for drivers that want to talk to userspace through - * the "usbfs" filesystem. This lets devices provide ways to - * expose information to user space regardless of where they - * do (or don't) show up otherwise in the filesystem. + - @ioctl: + Used for drivers that want to talk to userspace through + the "usbfs" filesystem. This lets devices provide ways to + expose information to user space regardless of where they + do (or don't) show up otherwise in the filesystem. 3. Power management (PM) callbacks: - * @suspend: Called when the device is going to be suspended. - * @resume: Called when the device is being resumed. - * @reset_resume: Called when the suspended device has been reset instead - * of being resumed. + - @suspend: + Called when the device is going to be suspended. + + - @resume: + Called when the device is being resumed. + + - @reset_resume: + Called when the suspended device has been reset instead + of being resumed. 4. Device level operations: - * @pre_reset: Called when the device is about to be reset. - * @post_reset: Called after the device has been reset + - @pre_reset: + Called when the device is about to be reset. + + - @post_reset: + Called after the device has been reset The ioctl interface (2) should be used only if you have a very good reason. Sysfs is preferred these days. The PM callbacks are covered @@ -58,7 +73,9 @@ an interface. A driver's bond to an interface is exclusive. The probe() callback -------------------- -int (*probe) (struct usb_interface *intf, +:: + + int (*probe) (struct usb_interface *intf, const struct usb_device_id *id); Accept or decline an interface. If you accept the device return 0, @@ -75,7 +92,9 @@ initialisation that doesn't take too long is a good idea here. The disconnect() callback ------------------------- -void (*disconnect) (struct usb_interface *intf); +:: + + void (*disconnect) (struct usb_interface *intf); This callback is a signal to break any connection with an interface. You are not allowed any IO to a device after returning from this @@ -93,7 +112,9 @@ Device level callbacks pre_reset --------- -int (*pre_reset)(struct usb_interface *intf); +:: + + int (*pre_reset)(struct usb_interface *intf); A driver or user space is triggering a reset on the device which contains the interface passed as an argument. Cease IO, wait for all @@ -107,7 +128,9 @@ are in atomic context. post_reset ---------- -int (*post_reset)(struct usb_interface *intf); +:: + + int (*post_reset)(struct usb_interface *intf); The reset has completed. Restore any saved device state and begin using the device again. diff --git a/Documentation/driver-api/usb/index.rst b/Documentation/driver-api/usb/index.rst index 6fe7611f7332..441c5dacdf27 100644 --- a/Documentation/driver-api/usb/index.rst +++ b/Documentation/driver-api/usb/index.rst @@ -8,6 +8,7 @@ Linux USB API gadget anchors bulk-streams + callbacks writing_usb_driver writing_musb_glue_layer |