v4.19.13 snapshot.
diff --git a/drivers/usb/serial/omninet.c b/drivers/usb/serial/omninet.c
new file mode 100644
index 0000000..e51c946
--- /dev/null
+++ b/drivers/usb/serial/omninet.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USB ZyXEL omni.net LCD PLUS driver
+ *
+ * Copyright (C) 2013,2017 Johan Hovold <johan@kernel.org>
+ *
+ * See Documentation/usb/usb-serial.txt for more information on using this
+ * driver
+ *
+ * Please report both successes and troubles to the author at omninet@kroah.com
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+
+#define DRIVER_AUTHOR "Alessandro Zummo"
+#define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"
+
+#define ZYXEL_VENDOR_ID 0x0586
+#define ZYXEL_OMNINET_ID 0x1000
+/* This one seems to be a re-branded ZyXEL device */
+#define BT_IGNITIONPRO_ID 0x2000
+
+/* function prototypes */
+static void omninet_process_read_urb(struct urb *urb);
+static int omninet_prepare_write_buffer(struct usb_serial_port *port,
+ void *buf, size_t count);
+static int omninet_calc_num_ports(struct usb_serial *serial,
+ struct usb_serial_endpoints *epds);
+static int omninet_port_probe(struct usb_serial_port *port);
+static int omninet_port_remove(struct usb_serial_port *port);
+
+static const struct usb_device_id id_table[] = {
+ { USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
+ { USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
+ { } /* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static struct usb_serial_driver zyxel_omninet_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "omninet",
+ },
+ .description = "ZyXEL - omni.net lcd plus usb",
+ .id_table = id_table,
+ .num_bulk_out = 2,
+ .calc_num_ports = omninet_calc_num_ports,
+ .port_probe = omninet_port_probe,
+ .port_remove = omninet_port_remove,
+ .process_read_urb = omninet_process_read_urb,
+ .prepare_write_buffer = omninet_prepare_write_buffer,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+ &zyxel_omninet_device, NULL
+};
+
+
+/*
+ * The protocol.
+ *
+ * The omni.net always exchange 64 bytes of data with the host. The first
+ * four bytes are the control header.
+ *
+ * oh_seq is a sequence number. Don't know if/how it's used.
+ * oh_len is the length of the data bytes in the packet.
+ * oh_xxx Bit-mapped, related to handshaking and status info.
+ * I normally set it to 0x03 in transmitted frames.
+ * 7: Active when the TA is in a CONNECTed state.
+ * 6: unknown
+ * 5: handshaking, unknown
+ * 4: handshaking, unknown
+ * 3: unknown, usually 0
+ * 2: unknown, usually 0
+ * 1: handshaking, unknown, usually set to 1 in transmitted frames
+ * 0: handshaking, unknown, usually set to 1 in transmitted frames
+ * oh_pad Probably a pad byte.
+ *
+ * After the header you will find data bytes if oh_len was greater than zero.
+ */
+struct omninet_header {
+ __u8 oh_seq;
+ __u8 oh_len;
+ __u8 oh_xxx;
+ __u8 oh_pad;
+};
+
+struct omninet_data {
+ __u8 od_outseq; /* Sequence number for bulk_out URBs */
+};
+
+static int omninet_calc_num_ports(struct usb_serial *serial,
+ struct usb_serial_endpoints *epds)
+{
+ /* We need only the second bulk-out for our single-port device. */
+ epds->bulk_out[0] = epds->bulk_out[1];
+ epds->num_bulk_out = 1;
+
+ return 1;
+}
+
+static int omninet_port_probe(struct usb_serial_port *port)
+{
+ struct omninet_data *od;
+
+ od = kzalloc(sizeof(*od), GFP_KERNEL);
+ if (!od)
+ return -ENOMEM;
+
+ usb_set_serial_port_data(port, od);
+
+ return 0;
+}
+
+static int omninet_port_remove(struct usb_serial_port *port)
+{
+ struct omninet_data *od;
+
+ od = usb_get_serial_port_data(port);
+ kfree(od);
+
+ return 0;
+}
+
+#define OMNINET_HEADERLEN 4
+#define OMNINET_BULKOUTSIZE 64
+#define OMNINET_PAYLOADSIZE (OMNINET_BULKOUTSIZE - OMNINET_HEADERLEN)
+
+static void omninet_process_read_urb(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ const struct omninet_header *hdr = urb->transfer_buffer;
+ const unsigned char *data;
+ size_t data_len;
+
+ if (urb->actual_length <= OMNINET_HEADERLEN || !hdr->oh_len)
+ return;
+
+ data = (char *)urb->transfer_buffer + OMNINET_HEADERLEN;
+ data_len = min_t(size_t, urb->actual_length - OMNINET_HEADERLEN,
+ hdr->oh_len);
+ tty_insert_flip_string(&port->port, data, data_len);
+ tty_flip_buffer_push(&port->port);
+}
+
+static int omninet_prepare_write_buffer(struct usb_serial_port *port,
+ void *buf, size_t count)
+{
+ struct omninet_data *od = usb_get_serial_port_data(port);
+ struct omninet_header *header = buf;
+
+ count = min_t(size_t, count, OMNINET_PAYLOADSIZE);
+
+ count = kfifo_out_locked(&port->write_fifo, buf + OMNINET_HEADERLEN,
+ count, &port->lock);
+
+ header->oh_seq = od->od_outseq++;
+ header->oh_len = count;
+ header->oh_xxx = 0x03;
+ header->oh_pad = 0x00;
+
+ /* always 64 bytes */
+ return OMNINET_BULKOUTSIZE;
+}
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL v2");