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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>
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3 changed files with 40 additions and 13 deletions
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@ -277,6 +277,9 @@ struct usb_serial_driver {
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void (*write_bulk_callback)(struct urb *urb);
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/* Called by the generic read bulk callback */
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void (*process_read_urb)(struct urb *urb);
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/* Called by the generic write implementation */
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int (*prepare_write_buffer)(struct usb_serial_port *port,
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void **dest, size_t size, const void *src, size_t count);
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};
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#define to_usb_serial_driver(d) \
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container_of(d, struct usb_serial_driver, driver)
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@ -329,6 +332,8 @@ extern void usb_serial_generic_deregister(void);
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extern int usb_serial_generic_submit_read_urb(struct usb_serial_port *port,
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gfp_t mem_flags);
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extern void usb_serial_generic_process_read_urb(struct urb *urb);
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extern int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port,
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void **dest, size_t size, const void *src, size_t count);
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extern int usb_serial_handle_sysrq_char(struct tty_struct *tty,
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struct usb_serial_port *port,
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unsigned int ch);
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