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path: root/drivers/usb/serial/usb_debug.c
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Diffstat (limited to 'drivers/usb/serial/usb_debug.c')
-rw-r--r--drivers/usb/serial/usb_debug.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/usb/serial/usb_debug.c b/drivers/usb/serial/usb_debug.c
index 6c9cbb59552..614800972dc 100644
--- a/drivers/usb/serial/usb_debug.c
+++ b/drivers/usb/serial/usb_debug.c
@@ -15,7 +15,19 @@
#include <linux/usb.h>
#include <linux/usb/serial.h>
+#define URB_DEBUG_MAX_IN_FLIGHT_URBS 4000
#define USB_DEBUG_MAX_PACKET_SIZE 8
+#define USB_DEBUG_BRK_SIZE 8
+static char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
+ 0x00,
+ 0xff,
+ 0x01,
+ 0xfe,
+ 0x00,
+ 0xfe,
+ 0x01,
+ 0xff,
+};
static struct usb_device_id id_table [] = {
{ USB_DEVICE(0x0525, 0x127a) },
@@ -38,6 +50,32 @@ static int usb_debug_open(struct tty_struct *tty, struct usb_serial_port *port,
return usb_serial_generic_open(tty, port, filp);
}
+/* This HW really does not support a serial break, so one will be
+ * emulated when ever the break state is set to true.
+ */
+static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ if (!break_state)
+ return;
+ usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
+}
+
+static void usb_debug_read_bulk_callback(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+
+ if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
+ memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
+ USB_DEBUG_BRK_SIZE) == 0) {
+ usb_serial_handle_break(port);
+ usb_serial_generic_resubmit_read_urb(port, GFP_ATOMIC);
+ return;
+ }
+
+ usb_serial_generic_read_bulk_callback(urb);
+}
+
static struct usb_serial_driver debug_device = {
.driver = {
.owner = THIS_MODULE,
@@ -46,6 +84,9 @@ static struct usb_serial_driver debug_device = {
.id_table = id_table,
.num_ports = 1,
.open = usb_debug_open,
+ .max_in_flight_urbs = URB_DEBUG_MAX_IN_FLIGHT_URBS,
+ .break_ctl = usb_debug_break_ctl,
+ .read_bulk_callback = usb_debug_read_bulk_callback,
};
static int __init debug_init(void)