Commit 23154320 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman

USB: serial: generalise generic read implementation

Add process_read_urb to usb_serial_driver so that a driver can rely on
the generic read (and throttle) mechanism but still do device specific
processing of incoming data (such as adding tty_flags before pushing to
line discipline).

The default generic implementation handles sysrq for consoles but
otherwise simply pushes to tty.
Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 0f3d5bae
......@@ -408,7 +408,7 @@ int usb_serial_generic_submit_read_urb(struct usb_serial_port *port,
}
EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urb);
static void usb_serial_generic_process_read_urb(struct urb *urb)
void usb_serial_generic_process_read_urb(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct tty_struct *tty;
......@@ -433,6 +433,7 @@ static void usb_serial_generic_process_read_urb(struct urb *urb)
tty_flip_buffer_push(tty);
tty_kref_put(tty);
}
EXPORT_SYMBOL_GPL(usb_serial_generic_process_read_urb);
void usb_serial_generic_read_bulk_callback(struct urb *urb)
{
......@@ -451,7 +452,7 @@ void usb_serial_generic_read_bulk_callback(struct urb *urb)
usb_serial_debug_data(debug, &port->dev, __func__,
urb->actual_length, data);
usb_serial_generic_process_read_urb(urb);
port->serial->type->process_read_urb(urb);
/* Throttle the device if requested by tty */
spin_lock_irqsave(&port->lock, flags);
......
......@@ -1298,6 +1298,7 @@ static void fixup_generic(struct usb_serial_driver *device)
set_to_generic_if_null(device, write_bulk_callback);
set_to_generic_if_null(device, disconnect);
set_to_generic_if_null(device, release);
set_to_generic_if_null(device, process_read_urb);
}
int usb_serial_register(struct usb_serial_driver *driver)
......
......@@ -272,6 +272,8 @@ struct usb_serial_driver {
void (*write_int_callback)(struct urb *urb);
void (*read_bulk_callback)(struct urb *urb);
void (*write_bulk_callback)(struct urb *urb);
/* Called by the generic read bulk callback */
void (*process_read_urb)(struct urb *urb);
};
#define to_usb_serial_driver(d) \
container_of(d, struct usb_serial_driver, driver)
......@@ -323,6 +325,7 @@ extern int usb_serial_generic_register(int debug);
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_handle_sysrq_char(struct tty_struct *tty,
struct usb_serial_port *port,
unsigned int ch);
......
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