2 * Opticon USB barcode to serial driver
4 * Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>
5 * Copyright (C) 2008 - 2009 Novell Inc.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/tty.h>
15 #include <linux/tty_driver.h>
16 #include <linux/slab.h>
17 #include <linux/tty_flip.h>
18 #include <linux/serial.h>
19 #include <linux/module.h>
20 #include <linux/usb.h>
21 #include <linux/usb/serial.h>
22 #include <linux/uaccess.h>
26 static const struct usb_device_id id_table[] = {
27 { USB_DEVICE(0x065a, 0x0009) },
30 MODULE_DEVICE_TABLE(usb, id_table);
32 /* This structure holds all of the individual device information */
33 struct opticon_private {
34 struct usb_device *udev;
35 struct usb_serial *serial;
36 struct usb_serial_port *port;
37 unsigned char *bulk_in_buffer;
38 struct urb *bulk_read_urb;
41 spinlock_t lock; /* protects the following flags */
43 bool actually_throttled;
48 /* max number of write urbs in flight */
49 #define URB_UPPER_LIMIT 4
51 static void opticon_bulk_callback(struct urb *urb)
53 struct opticon_private *priv = urb->context;
54 unsigned char *data = urb->transfer_buffer;
55 struct usb_serial_port *port = priv->port;
56 int status = urb->status;
57 struct tty_struct *tty;
61 dbg("%s - port %d", __func__, port->number);
70 /* this urb is terminated, clean up */
71 dbg("%s - urb shutting down with status: %d",
75 dbg("%s - nonzero urb status received: %d",
80 usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length,
83 if (urb->actual_length > 2) {
84 data_length = urb->actual_length - 2;
87 * Data from the device comes with a 2 byte header:
90 * This is real data to be sent to the tty layer
92 * This is a RTS level change, the third byte is the RTS
93 * value (0 for low, 1 for high).
95 if ((data[0] == 0x00) && (data[1] == 0x00)) {
96 /* real data, send it to the tty layer */
97 tty = tty_port_tty_get(&port->port);
99 tty_insert_flip_string(tty, data + 2,
101 tty_flip_buffer_push(tty);
105 if ((data[0] == 0x00) && (data[1] == 0x01)) {
111 dev_dbg(&priv->udev->dev,
112 "Unknown data packet received from the device:"
118 dev_dbg(&priv->udev->dev,
119 "Improper amount of data received from the device, "
120 "%d bytes", urb->actual_length);
124 spin_lock(&priv->lock);
126 /* Continue trying to always read if we should */
127 if (!priv->throttled) {
128 usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
129 usb_rcvbulkpipe(priv->udev,
131 priv->bulk_in_buffer, priv->buffer_size,
132 opticon_bulk_callback, priv);
133 result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC);
136 "%s - failed resubmitting read urb, error %d\n",
139 priv->actually_throttled = true;
140 spin_unlock(&priv->lock);
143 static int opticon_open(struct tty_struct *tty, struct usb_serial_port *port)
145 struct opticon_private *priv = usb_get_serial_data(port->serial);
149 dbg("%s - port %d", __func__, port->number);
151 spin_lock_irqsave(&priv->lock, flags);
152 priv->throttled = false;
153 priv->actually_throttled = false;
155 spin_unlock_irqrestore(&priv->lock, flags);
157 /* Start reading from the device */
158 usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
159 usb_rcvbulkpipe(priv->udev,
161 priv->bulk_in_buffer, priv->buffer_size,
162 opticon_bulk_callback, priv);
163 result = usb_submit_urb(priv->bulk_read_urb, GFP_KERNEL);
166 "%s - failed resubmitting read urb, error %d\n",
171 static void opticon_close(struct usb_serial_port *port)
173 struct opticon_private *priv = usb_get_serial_data(port->serial);
175 dbg("%s - port %d", __func__, port->number);
177 /* shutdown our urbs */
178 usb_kill_urb(priv->bulk_read_urb);
181 static void opticon_write_bulk_callback(struct urb *urb)
183 struct opticon_private *priv = urb->context;
184 int status = urb->status;
187 /* free up the transfer buffer, as usb_free_urb() does not do this */
188 kfree(urb->transfer_buffer);
190 /* setup packet may be set if we're using it for writing */
191 kfree(urb->setup_packet);
194 dbg("%s - nonzero write bulk status received: %d",
197 spin_lock_irqsave(&priv->lock, flags);
198 --priv->outstanding_urbs;
199 spin_unlock_irqrestore(&priv->lock, flags);
201 usb_serial_port_softint(priv->port);
204 static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
205 const unsigned char *buf, int count)
207 struct opticon_private *priv = usb_get_serial_data(port->serial);
208 struct usb_serial *serial = port->serial;
210 unsigned char *buffer;
214 dbg("%s - port %d", __func__, port->number);
216 spin_lock_irqsave(&priv->lock, flags);
217 if (priv->outstanding_urbs > URB_UPPER_LIMIT) {
218 spin_unlock_irqrestore(&priv->lock, flags);
219 dbg("%s - write limit hit", __func__);
222 priv->outstanding_urbs++;
223 spin_unlock_irqrestore(&priv->lock, flags);
225 buffer = kmalloc(count, GFP_ATOMIC);
227 dev_err(&port->dev, "out of memory\n");
229 goto error_no_buffer;
232 urb = usb_alloc_urb(0, GFP_ATOMIC);
234 dev_err(&port->dev, "no more free urbs\n");
239 memcpy(buffer, buf, count);
241 usb_serial_debug_data(debug, &port->dev, __func__, count, buffer);
243 if (port->bulk_out_endpointAddress) {
244 usb_fill_bulk_urb(urb, serial->dev,
245 usb_sndbulkpipe(serial->dev,
246 port->bulk_out_endpointAddress),
247 buffer, count, opticon_write_bulk_callback, priv);
249 struct usb_ctrlrequest *dr;
251 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
255 dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT;
259 dr->wLength = cpu_to_le16(count);
261 usb_fill_control_urb(urb, serial->dev,
262 usb_sndctrlpipe(serial->dev, 0),
263 (unsigned char *)dr, buffer, count,
264 opticon_write_bulk_callback, priv);
267 /* send it down the pipe */
268 status = usb_submit_urb(urb, GFP_ATOMIC);
271 "%s - usb_submit_urb(write bulk) failed with status = %d\n",
277 /* we are done with this urb, so let the host driver
278 * really free it when it is finished with it */
287 spin_lock_irqsave(&priv->lock, flags);
288 --priv->outstanding_urbs;
289 spin_unlock_irqrestore(&priv->lock, flags);
293 static int opticon_write_room(struct tty_struct *tty)
295 struct usb_serial_port *port = tty->driver_data;
296 struct opticon_private *priv = usb_get_serial_data(port->serial);
299 dbg("%s - port %d", __func__, port->number);
302 * We really can take almost anything the user throws at us
303 * but let's pick a nice big number to tell the tty
304 * layer that we have lots of free space, unless we don't.
306 spin_lock_irqsave(&priv->lock, flags);
307 if (priv->outstanding_urbs > URB_UPPER_LIMIT * 2 / 3) {
308 spin_unlock_irqrestore(&priv->lock, flags);
309 dbg("%s - write limit hit", __func__);
312 spin_unlock_irqrestore(&priv->lock, flags);
317 static void opticon_throttle(struct tty_struct *tty)
319 struct usb_serial_port *port = tty->driver_data;
320 struct opticon_private *priv = usb_get_serial_data(port->serial);
323 dbg("%s - port %d", __func__, port->number);
324 spin_lock_irqsave(&priv->lock, flags);
325 priv->throttled = true;
326 spin_unlock_irqrestore(&priv->lock, flags);
330 static void opticon_unthrottle(struct tty_struct *tty)
332 struct usb_serial_port *port = tty->driver_data;
333 struct opticon_private *priv = usb_get_serial_data(port->serial);
335 int result, was_throttled;
337 dbg("%s - port %d", __func__, port->number);
339 spin_lock_irqsave(&priv->lock, flags);
340 priv->throttled = false;
341 was_throttled = priv->actually_throttled;
342 priv->actually_throttled = false;
343 spin_unlock_irqrestore(&priv->lock, flags);
345 priv->bulk_read_urb->dev = port->serial->dev;
347 result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC);
350 "%s - failed submitting read urb, error %d\n",
355 static int opticon_tiocmget(struct tty_struct *tty)
357 struct usb_serial_port *port = tty->driver_data;
358 struct opticon_private *priv = usb_get_serial_data(port->serial);
362 dbg("%s - port %d", __func__, port->number);
364 spin_lock_irqsave(&priv->lock, flags);
367 spin_unlock_irqrestore(&priv->lock, flags);
369 dbg("%s - %x", __func__, result);
373 static int get_serial_info(struct opticon_private *priv,
374 struct serial_struct __user *serial)
376 struct serial_struct tmp;
381 memset(&tmp, 0x00, sizeof(tmp));
383 /* fake emulate a 16550 uart to make userspace code happy */
384 tmp.type = PORT_16550A;
385 tmp.line = priv->serial->minor;
388 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
389 tmp.xmit_fifo_size = 1024;
390 tmp.baud_base = 9600;
391 tmp.close_delay = 5*HZ;
392 tmp.closing_wait = 30*HZ;
394 if (copy_to_user(serial, &tmp, sizeof(*serial)))
399 static int opticon_ioctl(struct tty_struct *tty,
400 unsigned int cmd, unsigned long arg)
402 struct usb_serial_port *port = tty->driver_data;
403 struct opticon_private *priv = usb_get_serial_data(port->serial);
405 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
409 return get_serial_info(priv,
410 (struct serial_struct __user *)arg);
416 static int opticon_startup(struct usb_serial *serial)
418 struct opticon_private *priv;
419 struct usb_host_interface *intf;
421 int retval = -ENOMEM;
422 bool bulk_in_found = false;
424 /* create our private serial structure */
425 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
427 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
430 spin_lock_init(&priv->lock);
431 priv->serial = serial;
432 priv->port = serial->port[0];
433 priv->udev = serial->dev;
435 /* find our bulk endpoint */
436 intf = serial->interface->altsetting;
437 for (i = 0; i < intf->desc.bNumEndpoints; ++i) {
438 struct usb_endpoint_descriptor *endpoint;
440 endpoint = &intf->endpoint[i].desc;
441 if (!usb_endpoint_is_bulk_in(endpoint))
444 priv->bulk_read_urb = usb_alloc_urb(0, GFP_KERNEL);
445 if (!priv->bulk_read_urb) {
446 dev_err(&priv->udev->dev, "out of memory\n");
450 priv->buffer_size = le16_to_cpu(endpoint->wMaxPacketSize) * 2;
451 priv->bulk_in_buffer = kmalloc(priv->buffer_size, GFP_KERNEL);
452 if (!priv->bulk_in_buffer) {
453 dev_err(&priv->udev->dev, "out of memory\n");
457 priv->bulk_address = endpoint->bEndpointAddress;
459 /* set up our bulk urb */
460 usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
461 usb_rcvbulkpipe(priv->udev,
462 endpoint->bEndpointAddress),
463 priv->bulk_in_buffer, priv->buffer_size,
464 opticon_bulk_callback, priv);
466 bulk_in_found = true;
470 if (!bulk_in_found) {
471 dev_err(&priv->udev->dev,
472 "Error - the proper endpoints were not found!\n");
476 usb_set_serial_data(serial, priv);
480 usb_free_urb(priv->bulk_read_urb);
481 kfree(priv->bulk_in_buffer);
486 static void opticon_disconnect(struct usb_serial *serial)
488 struct opticon_private *priv = usb_get_serial_data(serial);
492 usb_kill_urb(priv->bulk_read_urb);
493 usb_free_urb(priv->bulk_read_urb);
496 static void opticon_release(struct usb_serial *serial)
498 struct opticon_private *priv = usb_get_serial_data(serial);
502 kfree(priv->bulk_in_buffer);
506 static int opticon_suspend(struct usb_interface *intf, pm_message_t message)
508 struct usb_serial *serial = usb_get_intfdata(intf);
509 struct opticon_private *priv = usb_get_serial_data(serial);
511 usb_kill_urb(priv->bulk_read_urb);
515 static int opticon_resume(struct usb_interface *intf)
517 struct usb_serial *serial = usb_get_intfdata(intf);
518 struct opticon_private *priv = usb_get_serial_data(serial);
519 struct usb_serial_port *port = serial->port[0];
522 mutex_lock(&port->port.mutex);
523 /* This is protected by the port mutex against close/open */
524 if (test_bit(ASYNCB_INITIALIZED, &port->port.flags))
525 result = usb_submit_urb(priv->bulk_read_urb, GFP_NOIO);
528 mutex_unlock(&port->port.mutex);
532 static struct usb_driver opticon_driver = {
534 .probe = usb_serial_probe,
535 .disconnect = usb_serial_disconnect,
536 .suspend = opticon_suspend,
537 .resume = opticon_resume,
538 .id_table = id_table,
542 static struct usb_serial_driver opticon_device = {
544 .owner = THIS_MODULE,
547 .id_table = id_table,
548 .usb_driver = &opticon_driver,
550 .attach = opticon_startup,
551 .open = opticon_open,
552 .close = opticon_close,
553 .write = opticon_write,
554 .write_room = opticon_write_room,
555 .disconnect = opticon_disconnect,
556 .release = opticon_release,
557 .throttle = opticon_throttle,
558 .unthrottle = opticon_unthrottle,
559 .ioctl = opticon_ioctl,
560 .tiocmget = opticon_tiocmget,
563 static int __init opticon_init(void)
567 retval = usb_serial_register(&opticon_device);
570 retval = usb_register(&opticon_driver);
572 usb_serial_deregister(&opticon_device);
576 static void __exit opticon_exit(void)
578 usb_deregister(&opticon_driver);
579 usb_serial_deregister(&opticon_device);
582 module_init(opticon_init);
583 module_exit(opticon_exit);
584 MODULE_LICENSE("GPL");
586 module_param(debug, bool, S_IRUGO | S_IWUSR);
587 MODULE_PARM_DESC(debug, "Debug enabled or not");