* 2 as published by the Free Software Foundation.
*/
+#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
-static struct usb_device_id id_table [] = {
+#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 const struct usb_device_id id_table[] = {
{ USB_DEVICE(0x0525, 0x127a) },
{ },
};
.no_dynamic_id = 1,
};
+static int usb_debug_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+ port->bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE;
+ return usb_serial_generic_open(tty, port);
+}
+
+/* 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,
},
.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)