diff options
| author | Johan Hovold <jhovold@gmail.com> | 2010-03-17 23:06:08 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-20 13:21:35 -0700 |
| commit | eaa3bcb06aed1ac1d6d9e3edd3b5f72ea57a6ac0 (patch) | |
| tree | a55b216df6a5977ab8d502df44397ef7ebbb11bc /include | |
| parent | 25d514ca227e1ac81d0906a4ccf2aa171f50a600 (diff) | |
USB: serial: generalise write buffer preparation
Generalise write buffer preparation.
This allows for drivers to manipulate (e.g. add headers) to bulk out
data before it is sent.
This adds a new function pointer to usb_serial_driver:
int (*prepare_write_buffer)(struct usb_serial_port *port,
void **dest, size_t size, const void *src, size_t count);
The function is generic and can be used with either kfifo-based or
multi-urb writes:
If *dest is NULL the implementation should allocate dest.
If src is NULL the implementation should use the port write fifo.
If not set, a generic implementation is used which simply uses memcpy or
kfifo_out.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/usb/serial.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h index 2a328376160..a4c99ea390e 100644 --- a/include/linux/usb/serial.h +++ b/include/linux/usb/serial.h @@ -277,6 +277,9 @@ struct usb_serial_driver { void (*write_bulk_callback)(struct urb *urb); /* Called by the generic read bulk callback */ void (*process_read_urb)(struct urb *urb); + /* Called by the generic write implementation */ + int (*prepare_write_buffer)(struct usb_serial_port *port, + void **dest, size_t size, const void *src, size_t count); }; #define to_usb_serial_driver(d) \ container_of(d, struct usb_serial_driver, driver) @@ -329,6 +332,8 @@ extern void usb_serial_generic_deregister(void); extern int usb_serial_generic_submit_read_urb(struct usb_serial_port *port, gfp_t mem_flags); extern void usb_serial_generic_process_read_urb(struct urb *urb); +extern int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port, + void **dest, size_t size, const void *src, size_t count); extern int usb_serial_handle_sysrq_char(struct tty_struct *tty, struct usb_serial_port *port, unsigned int ch); |