2 * USB ZyXEL omni.net LCD PLUS driver
4 * Copyright (C) 2013,2017 Johan Hovold <johan@kernel.org>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
10 * See Documentation/usb/usb-serial.txt for more information on using this
13 * Please report both successes and troubles to the author at omninet@kroah.com
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/tty.h>
20 #include <linux/tty_driver.h>
21 #include <linux/tty_flip.h>
22 #include <linux/module.h>
23 #include <linux/uaccess.h>
24 #include <linux/usb.h>
25 #include <linux/usb/serial.h>
27 #define DRIVER_AUTHOR "Alessandro Zummo"
28 #define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"
30 #define ZYXEL_VENDOR_ID 0x0586
31 #define ZYXEL_OMNINET_ID 0x1000
32 #define ZYXEL_OMNI_56K_PLUS_ID 0x1500
33 /* This one seems to be a re-branded ZyXEL device */
34 #define BT_IGNITIONPRO_ID 0x2000
36 /* function prototypes */
37 static void omninet_process_read_urb(struct urb *urb);
38 static int omninet_prepare_write_buffer(struct usb_serial_port *port,
39 void *buf, size_t count);
40 static int omninet_calc_num_ports(struct usb_serial *serial,
41 struct usb_serial_endpoints *epds);
42 static int omninet_port_probe(struct usb_serial_port *port);
43 static int omninet_port_remove(struct usb_serial_port *port);
45 static const struct usb_device_id id_table[] = {
46 { USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
47 { USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNI_56K_PLUS_ID) },
48 { USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
49 { } /* Terminating entry */
51 MODULE_DEVICE_TABLE(usb, id_table);
53 static struct usb_serial_driver zyxel_omninet_device = {
58 .description = "ZyXEL - omni.net lcd plus usb",
61 .calc_num_ports = omninet_calc_num_ports,
62 .port_probe = omninet_port_probe,
63 .port_remove = omninet_port_remove,
64 .process_read_urb = omninet_process_read_urb,
65 .prepare_write_buffer = omninet_prepare_write_buffer,
68 static struct usb_serial_driver * const serial_drivers[] = {
69 &zyxel_omninet_device, NULL
76 * The omni.net always exchange 64 bytes of data with the host. The first
77 * four bytes are the control header.
79 * oh_seq is a sequence number. Don't know if/how it's used.
80 * oh_len is the length of the data bytes in the packet.
81 * oh_xxx Bit-mapped, related to handshaking and status info.
82 * I normally set it to 0x03 in transmitted frames.
83 * 7: Active when the TA is in a CONNECTed state.
85 * 5: handshaking, unknown
86 * 4: handshaking, unknown
87 * 3: unknown, usually 0
88 * 2: unknown, usually 0
89 * 1: handshaking, unknown, usually set to 1 in transmitted frames
90 * 0: handshaking, unknown, usually set to 1 in transmitted frames
91 * oh_pad Probably a pad byte.
93 * After the header you will find data bytes if oh_len was greater than zero.
95 struct omninet_header {
102 struct omninet_data {
103 __u8 od_outseq; /* Sequence number for bulk_out URBs */
106 static int omninet_calc_num_ports(struct usb_serial *serial,
107 struct usb_serial_endpoints *epds)
109 /* We need only the second bulk-out for our single-port device. */
110 epds->bulk_out[0] = epds->bulk_out[1];
111 epds->num_bulk_out = 1;
116 static int omninet_port_probe(struct usb_serial_port *port)
118 struct omninet_data *od;
120 od = kzalloc(sizeof(*od), GFP_KERNEL);
124 usb_set_serial_port_data(port, od);
129 static int omninet_port_remove(struct usb_serial_port *port)
131 struct omninet_data *od;
133 od = usb_get_serial_port_data(port);
139 #define OMNINET_HEADERLEN 4
140 #define OMNINET_BULKOUTSIZE 64
141 #define OMNINET_PAYLOADSIZE (OMNINET_BULKOUTSIZE - OMNINET_HEADERLEN)
143 static void omninet_process_read_urb(struct urb *urb)
145 struct usb_serial_port *port = urb->context;
146 const struct omninet_header *hdr = urb->transfer_buffer;
147 const unsigned char *data;
150 if (urb->actual_length <= OMNINET_HEADERLEN || !hdr->oh_len)
153 data = (char *)urb->transfer_buffer + OMNINET_HEADERLEN;
154 data_len = min_t(size_t, urb->actual_length - OMNINET_HEADERLEN,
156 tty_insert_flip_string(&port->port, data, data_len);
157 tty_flip_buffer_push(&port->port);
160 static int omninet_prepare_write_buffer(struct usb_serial_port *port,
161 void *buf, size_t count)
163 struct omninet_data *od = usb_get_serial_port_data(port);
164 struct omninet_header *header = buf;
166 count = min_t(size_t, count, OMNINET_PAYLOADSIZE);
168 count = kfifo_out_locked(&port->write_fifo, buf + OMNINET_HEADERLEN,
171 header->oh_seq = od->od_outseq++;
172 header->oh_len = count;
173 header->oh_xxx = 0x03;
174 header->oh_pad = 0x00;
176 /* always 64 bytes */
177 return OMNINET_BULKOUTSIZE;
180 module_usb_serial_driver(serial_drivers, id_table);
182 MODULE_AUTHOR(DRIVER_AUTHOR);
183 MODULE_DESCRIPTION(DRIVER_DESC);
184 MODULE_LICENSE("GPL");