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authorJohan Hovold <jhovold@gmail.com>2010-03-17 23:06:08 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-20 13:21:35 -0700
commiteaa3bcb06aed1ac1d6d9e3edd3b5f72ea57a6ac0 (patch)
treea55b216df6a5977ab8d502df44397ef7ebbb11bc /include
parent25d514ca227e1ac81d0906a4ccf2aa171f50a600 (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.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 2a3283761600..a4c99ea390e7 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);