2 * USB ZyXEL omni.net LCD PLUS driver
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * See Documentation/usb/usb-serial.txt for more information on using this driver
11 * Please report both successes and troubles to the author at omninet@kroah.com
14 * switched from using spinlock to a semaphore, which fixes lots of problems.
17 * Identify version on module load.
19 * (11/01/2000) Adam J. Richter
20 * usb_device_id table support
23 * Fixed bug with urb->dev not being set properly, now that the usb
27 * Added locks for SMP safeness.
28 * Fixed MOD_INC and MOD_DEC logic and the ability to open a port more
30 * Fixed potential race in omninet_write_bulk_callback
33 * Added module_init and module_exit functions to handle the fact that this
34 * driver is a loadable module now.
38 #include <linux/config.h>
39 #include <linux/kernel.h>
40 #include <linux/errno.h>
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/tty.h>
44 #include <linux/tty_driver.h>
45 #include <linux/tty_flip.h>
46 #include <linux/module.h>
47 #include <linux/spinlock.h>
48 #include <asm/uaccess.h>
49 #include <linux/usb.h>
51 #ifdef CONFIG_USB_SERIAL_DEBUG
57 #include "usb-serial.h"
63 #define DRIVER_VERSION "v1.1"
64 #define DRIVER_AUTHOR "Alessandro Zummo"
65 #define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"
67 #define ZYXEL_VENDOR_ID 0x0586
68 #define ZYXEL_OMNINET_ID 0x1000
69 #define BT_IGNITIONPRO_ID 0x2000 /* This one seems to be a re-branded ZyXEL device */
71 /* function prototypes */
72 static int omninet_open (struct usb_serial_port *port, struct file *filp);
73 static void omninet_close (struct usb_serial_port *port, struct file *filp);
74 static void omninet_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
75 static void omninet_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
76 static int omninet_write (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count);
77 static int omninet_write_room (struct usb_serial_port *port);
78 static void omninet_shutdown (struct usb_serial *serial);
80 static struct usb_device_id id_table [] = {
81 { USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
82 { USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
83 { } /* Terminating entry */
86 MODULE_DEVICE_TABLE (usb, id_table);
88 static struct usb_driver omninet_driver = {
91 .probe = usb_serial_probe,
92 .disconnect = usb_serial_disconnect,
97 static struct usb_serial_device_type zyxel_omninet_device = {
99 .name = "ZyXEL - omni.net lcd plus usb",
100 .short_name = "omninet",
101 .id_table = id_table,
102 .num_interrupt_in = 1,
106 .open = omninet_open,
107 .close = omninet_close,
108 .write = omninet_write,
109 .write_room = omninet_write_room,
110 .read_bulk_callback = omninet_read_bulk_callback,
111 .write_bulk_callback = omninet_write_bulk_callback,
112 .shutdown = omninet_shutdown,
118 * The omni.net always exchange 64 bytes of data with the host. The first
119 * four bytes are the control header, you can see it in the above structure.
121 * oh_seq is a sequence number. Don't know if/how it's used.
122 * oh_len is the length of the data bytes in the packet.
123 * oh_xxx Bit-mapped, related to handshaking and status info.
124 * I normally set it to 0x03 in trasmitted frames.
125 * 7: Active when the TA is in a CONNECTed state.
127 * 5: handshaking, unknown
128 * 4: handshaking, unknown
129 * 3: unknown, usually 0
130 * 2: unknown, usually 0
131 * 1: handshaking, unknown, usually set to 1 in trasmitted frames
132 * 0: handshaking, unknown, usually set to 1 in trasmitted frames
133 * oh_pad Probably a pad byte.
135 * After the header you will find data bytes if oh_len was greater than zero.
139 struct omninet_header
149 __u8 od_outseq; // Sequence number for bulk_out URBs
152 static int omninet_open (struct usb_serial_port *port, struct file *filp)
154 struct usb_serial *serial = port->serial;
155 struct usb_serial_port *wport;
156 struct omninet_data *od;
159 dbg("%s - port %d", __FUNCTION__, port->number);
161 od = kmalloc( sizeof(struct omninet_data), GFP_KERNEL );
163 err("%s- kmalloc(%Zd) failed.", __FUNCTION__, sizeof(struct omninet_data));
167 usb_set_serial_port_data(port, od);
168 wport = serial->port[1];
169 wport->tty = port->tty;
171 /* Start reading from the device */
172 usb_fill_bulk_urb(port->read_urb, serial->dev,
173 usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
174 port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
175 omninet_read_bulk_callback, port);
176 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
178 err("%s - failed submitting read urb, error %d", __FUNCTION__, result);
183 static void omninet_close (struct usb_serial_port *port, struct file * filp)
185 struct usb_serial *serial = port->serial;
186 struct usb_serial_port *wport;
187 struct omninet_data *od;
189 dbg("%s - port %d", __FUNCTION__, port->number);
191 wport = serial->port[1];
192 usb_unlink_urb(wport->write_urb);
193 usb_unlink_urb(port->read_urb);
195 od = usb_get_serial_port_data(port);
201 #define OMNINET_DATAOFFSET 0x04
202 #define OMNINET_HEADERLEN sizeof(struct omninet_header)
203 #define OMNINET_BULKOUTSIZE (64 - OMNINET_HEADERLEN)
205 static void omninet_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
207 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
208 unsigned char *data = urb->transfer_buffer;
209 struct omninet_header *header = (struct omninet_header *) &data[0];
214 // dbg("omninet_read_bulk_callback");
217 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
221 if ((debug) && (header->oh_xxx != 0x30)) {
222 if (urb->actual_length) {
223 printk (KERN_DEBUG __FILE__ ": omninet_read %d: ", header->oh_len);
224 for (i = 0; i < (header->oh_len + OMNINET_HEADERLEN); i++) {
225 printk ("%.2x ", data[i]);
231 if (urb->actual_length && header->oh_len) {
232 for (i = 0; i < header->oh_len; i++) {
233 tty_insert_flip_char(port->tty, data[OMNINET_DATAOFFSET + i], 0);
235 tty_flip_buffer_push(port->tty);
238 /* Continue trying to always read */
239 usb_fill_bulk_urb(urb, port->serial->dev,
240 usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
241 urb->transfer_buffer, urb->transfer_buffer_length,
242 omninet_read_bulk_callback, port);
243 result = usb_submit_urb(urb, GFP_ATOMIC);
245 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
250 static int omninet_write (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count)
252 struct usb_serial *serial = port->serial;
253 struct usb_serial_port *wport = serial->port[1];
255 struct omninet_data *od = usb_get_serial_port_data(port);
256 struct omninet_header *header = (struct omninet_header *) wport->write_urb->transfer_buffer;
260 // dbg("omninet_write port %d", port->number);
263 dbg("%s - write request of 0 bytes", __FUNCTION__);
266 if (wport->write_urb->status == -EINPROGRESS) {
267 dbg("%s - already writing", __FUNCTION__);
271 count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count;
274 if (copy_from_user(wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET, buf, count) != 0) {
280 memcpy (wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET, buf, count);
283 usb_serial_debug_data (__FILE__, __FUNCTION__, count, wport->write_urb->transfer_buffer);
285 header->oh_seq = od->od_outseq++;
286 header->oh_len = count;
287 header->oh_xxx = 0x03;
288 header->oh_pad = 0x00;
290 /* send the data out the bulk port, always 64 bytes */
291 wport->write_urb->transfer_buffer_length = 64;
293 wport->write_urb->dev = serial->dev;
294 result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
296 err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
305 static int omninet_write_room (struct usb_serial_port *port)
307 struct usb_serial *serial = port->serial;
308 struct usb_serial_port *wport = serial->port[1];
310 int room = 0; // Default: no room
312 if (wport->write_urb->status != -EINPROGRESS)
313 room = wport->bulk_out_size - OMNINET_HEADERLEN;
315 // dbg("omninet_write_room returns %d", room);
320 static void omninet_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
322 /* struct omninet_header *header = (struct omninet_header *) urb->transfer_buffer; */
323 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
325 // dbg("omninet_write_bulk_callback, port %0x\n", port);
328 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
332 schedule_work(&port->work);
334 // dbg("omninet_write_bulk_callback, tty %0x\n", tty);
338 static void omninet_shutdown (struct usb_serial *serial)
340 dbg ("%s", __FUNCTION__);
344 static int __init omninet_init (void)
347 retval = usb_serial_register(&zyxel_omninet_device);
349 goto failed_usb_serial_register;
350 retval = usb_register(&omninet_driver);
352 goto failed_usb_register;
353 info(DRIVER_VERSION ":" DRIVER_DESC);
356 usb_serial_deregister(&zyxel_omninet_device);
357 failed_usb_serial_register:
362 static void __exit omninet_exit (void)
364 usb_deregister (&omninet_driver);
365 usb_serial_deregister (&zyxel_omninet_device);
369 module_init(omninet_init);
370 module_exit(omninet_exit);
372 MODULE_AUTHOR( DRIVER_AUTHOR );
373 MODULE_DESCRIPTION( DRIVER_DESC );
374 MODULE_LICENSE("GPL");
376 MODULE_PARM(debug, "i");
377 MODULE_PARM_DESC(debug, "Debug enabled or not");