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USB: serial: generalise write buffer preparation

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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>
This commit is contained in:
Johan Hovold 2010-03-17 23:06:08 +01:00 • committed by Greg Kroah-Hartman
parent 25d514ca22
commit eaa3bcb06a
3 changed files with 40 additions and 13 deletions
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1
drivers/usb/serial/usb-serial.c
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@ -1299,6 +1299,7 @@ static void fixup_generic(struct usb_serial_driver *device)
set_to_generic_if_null(device, disconnect);
set_to_generic_if_null(device, release);
set_to_generic_if_null(device, process_read_urb);
set_to_generic_if_null(device, prepare_write_buffer);
}
int usb_serial_register(struct usb_serial_driver *driver)