From 98fcb5f78165b8a3d93870ad7afd4d9ebbb8b43a Mon Sep 17 00:00:00 2001 From: Jason Wessel Date: Mon, 11 May 2009 15:24:09 -0500 Subject: USB: serial: usb_debug,usb_generic_serial: implement sysrq and serial break The usb_debug driver was modified to implement serial break handling by using a "magic" data packet comprised of the sequence: 0x00 0xff 0x01 0xfe 0x00 0xfe 0x01 0xff When the tty layer requests a serial break the usb_debug driver sends the magic packet. On the receiving side the magic packet is thrown away or a sysrq is activated depending on what kernel .config options have been set. The generic serial driver was modified as well as the usb serial headers to generically implement sysrq processing in the same way the non usb uart based drivers implement the sysrq handling. This will allow other usb serial devices to implement sysrq handling as desired. The new usb serial functions are named similarly and implemented similarly to the uart functions as follows: usb_serial_handle_break <-> uart_handle_break usb_serial_handle_sysrq_char <-> uart_handle_sysrq_char Signed-off-by: Jason Wessel Signed-off-by: Greg Kroah-Hartman --- include/linux/usb/serial.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/linux/usb') diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h index e2938fd179e..e29ebcf3287 100644 --- a/include/linux/usb/serial.h +++ b/include/linux/usb/serial.h @@ -15,6 +15,7 @@ #include #include +#include #define SERIAL_TTY_MAJOR 188 /* Nice legal number now */ #define SERIAL_TTY_MINORS 254 /* loads of devices :) */ @@ -99,6 +100,7 @@ struct usb_serial_port { char throttled; char throttle_req; char console; + unsigned long sysrq; /* sysrq timeout */ struct device dev; }; #define to_usb_serial_port(d) container_of(d, struct usb_serial_port, dev) @@ -301,6 +303,12 @@ extern void usb_serial_generic_unthrottle(struct tty_struct *tty); extern void usb_serial_generic_shutdown(struct usb_serial *serial); extern int usb_serial_generic_register(int debug); extern void usb_serial_generic_deregister(void); +extern void usb_serial_generic_resubmit_read_urb(struct usb_serial_port *port, + gfp_t mem_flags); +extern int usb_serial_handle_sysrq_char(struct usb_serial_port *port, + unsigned int ch); +extern int usb_serial_handle_break(struct usb_serial_port *port); + extern int usb_serial_bus_register(struct usb_serial_driver *device); extern void usb_serial_bus_deregister(struct usb_serial_driver *device); -- cgit v1.2.3