2 * Belkin USB Serial Adapter Driver
4 * Copyright (C) 2000 William Greathouse (wgreathouse@smva.com)
5 * Copyright (C) 2000-2001 Greg Kroah-Hartman (greg@kroah.com)
7 * This program is largely derived from work by the linux-usb group
8 * and associated source files. Please see the usb/serial files for
9 * individual credits and copyrights.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * See Documentation/usb/usb-serial.txt for more information on using this driver
19 * -- Add true modem contol line query capability. Currently we track the
20 * states reported by the interrupt and the states we request.
21 * -- Add error reporting back to application for UART error conditions.
22 * Just point me at how to implement this and I'll do it. I've put the
23 * framework in, but haven't analyzed the "tty_flip" interface yet.
24 * -- Add support for flush commands
25 * -- Add everything that is missing :)
28 * compressed all the differnent device entries into 1.
31 * switched from using spinlock to a semaphore, which fixes lots of problems.
34 * - Identify version on module load.
37 * - Added support for the GoHubs GO-COM232 device which is the same as the
41 * - Added support for the old Belkin and Peracom devices.
42 * - Made the port able to be opened multiple times.
43 * - Added some defaults incase the line settings are things these devices
46 * 18-Oct-2000 William Greathouse
47 * Released into the wild (linux-usb-devel)
49 * 17-Oct-2000 William Greathouse
50 * Add code to recognize firmware version and set hardware flow control
51 * appropriately. Belkin states that firmware prior to 3.05 does not
52 * operate correctly in hardware handshake mode. I have verified this
53 * on firmware 2.05 -- for both RTS and DTR input flow control, the control
54 * line is not reset. The test performed by the Belkin Win* driver is
55 * to enable hardware flow control for firmware 2.06 or greater and
56 * for 1.00 or prior. I am only enabling for 2.06 or greater.
58 * 12-Oct-2000 William Greathouse
59 * First cut at supporting Belkin USB Serial Adapter F5U103
60 * I did not have a copy of the original work to support this
61 * adapter, so pardon any stupid mistakes. All of the information
62 * I am using to write this driver was acquired by using a modified
63 * UsbSnoop on Windows2000 and from examining the other USB drivers.
66 #include <linux/kernel.h>
67 #include <linux/errno.h>
68 #include <linux/init.h>
69 #include <linux/slab.h>
70 #include <linux/tty.h>
71 #include <linux/tty_driver.h>
72 #include <linux/tty_flip.h>
73 #include <linux/module.h>
74 #include <linux/spinlock.h>
75 #include <asm/uaccess.h>
76 #include <linux/usb.h>
77 #include <linux/usb/serial.h>
78 #include "belkin_sa.h"
85 #define DRIVER_VERSION "v1.2"
86 #define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
87 #define DRIVER_DESC "USB Belkin Serial converter driver"
89 /* function prototypes for a Belkin USB Serial Adapter F5U103 */
90 static int belkin_sa_startup (struct usb_serial *serial);
91 static void belkin_sa_shutdown (struct usb_serial *serial);
92 static int belkin_sa_open (struct usb_serial_port *port, struct file *filp);
93 static void belkin_sa_close (struct usb_serial_port *port, struct file *filp);
94 static void belkin_sa_read_int_callback (struct urb *urb);
95 static void belkin_sa_set_termios (struct usb_serial_port *port, struct ktermios * old);
96 static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
97 static void belkin_sa_break_ctl (struct usb_serial_port *port, int break_state );
98 static int belkin_sa_tiocmget (struct usb_serial_port *port, struct file *file);
99 static int belkin_sa_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
102 static struct usb_device_id id_table_combined [] = {
103 { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
104 { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
105 { USB_DEVICE(PERACOM_VID, PERACOM_PID) },
106 { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
107 { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
108 { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
109 { } /* Terminating entry */
112 MODULE_DEVICE_TABLE (usb, id_table_combined);
114 static struct usb_driver belkin_driver = {
116 .probe = usb_serial_probe,
117 .disconnect = usb_serial_disconnect,
118 .id_table = id_table_combined,
122 /* All of the device info needed for the serial converters */
123 static struct usb_serial_driver belkin_device = {
125 .owner = THIS_MODULE,
128 .description = "Belkin / Peracom / GoHubs USB Serial Adapter",
129 .usb_driver = &belkin_driver,
130 .id_table = id_table_combined,
131 .num_interrupt_in = 1,
135 .open = belkin_sa_open,
136 .close = belkin_sa_close,
137 .read_int_callback = belkin_sa_read_int_callback, /* How we get the status info */
138 .ioctl = belkin_sa_ioctl,
139 .set_termios = belkin_sa_set_termios,
140 .break_ctl = belkin_sa_break_ctl,
141 .tiocmget = belkin_sa_tiocmget,
142 .tiocmset = belkin_sa_tiocmset,
143 .attach = belkin_sa_startup,
144 .shutdown = belkin_sa_shutdown,
148 struct belkin_sa_private {
150 unsigned long control_state;
151 unsigned char last_lsr;
152 unsigned char last_msr;
153 int bad_flow_control;
158 * ***************************************************************************
159 * Belkin USB Serial Adapter F5U103 specific driver functions
160 * ***************************************************************************
163 #define WDR_TIMEOUT 5000 /* default urb timeout */
165 /* assumes that struct usb_serial *serial is available */
166 #define BSA_USB_CMD(c,v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
167 (c), BELKIN_SA_SET_REQUEST_TYPE, \
168 (v), 0, NULL, 0, WDR_TIMEOUT)
170 /* do some startup allocations not currently performed by usb_serial_probe() */
171 static int belkin_sa_startup (struct usb_serial *serial)
173 struct usb_device *dev = serial->dev;
174 struct belkin_sa_private *priv;
176 /* allocate the private data structure */
177 priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
179 return (-1); /* error */
180 /* set initial values for control structures */
181 spin_lock_init(&priv->lock);
182 priv->control_state = 0;
185 /* see comments at top of file */
186 priv->bad_flow_control = (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
187 info("bcdDevice: %04x, bfc: %d", le16_to_cpu(dev->descriptor.bcdDevice), priv->bad_flow_control);
189 init_waitqueue_head(&serial->port[0]->write_wait);
190 usb_set_serial_port_data(serial->port[0], priv);
196 static void belkin_sa_shutdown (struct usb_serial *serial)
198 struct belkin_sa_private *priv;
201 dbg ("%s", __FUNCTION__);
203 /* stop reads and writes on all ports */
204 for (i=0; i < serial->num_ports; ++i) {
205 /* My special items, the standard routines free my urbs */
206 priv = usb_get_serial_port_data(serial->port[i]);
212 static int belkin_sa_open (struct usb_serial_port *port, struct file *filp)
216 dbg("%s port %d", __FUNCTION__, port->number);
218 /*Start reading from the device*/
219 /* TODO: Look at possibility of submitting multiple URBs to device to
220 * enhance buffering. Win trace shows 16 initial read URBs.
222 port->read_urb->dev = port->serial->dev;
223 retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
225 err("usb_submit_urb(read bulk) failed");
229 port->interrupt_in_urb->dev = port->serial->dev;
230 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
232 usb_kill_urb(port->read_urb);
233 err(" usb_submit_urb(read int) failed");
238 } /* belkin_sa_open */
241 static void belkin_sa_close (struct usb_serial_port *port, struct file *filp)
243 dbg("%s port %d", __FUNCTION__, port->number);
245 /* shutdown our bulk reads and writes */
246 usb_kill_urb(port->write_urb);
247 usb_kill_urb(port->read_urb);
248 usb_kill_urb(port->interrupt_in_urb);
249 } /* belkin_sa_close */
252 static void belkin_sa_read_int_callback (struct urb *urb)
254 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
255 struct belkin_sa_private *priv;
256 unsigned char *data = urb->transfer_buffer;
258 int status = urb->status;
268 /* this urb is terminated, clean up */
269 dbg("%s - urb shutting down with status: %d",
270 __FUNCTION__, status);
273 dbg("%s - nonzero urb status received: %d",
274 __FUNCTION__, status);
278 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
280 /* Handle known interrupt data */
281 /* ignore data[0] and data[1] */
283 priv = usb_get_serial_port_data(port);
284 spin_lock_irqsave(&priv->lock, flags);
285 priv->last_msr = data[BELKIN_SA_MSR_INDEX];
287 /* Record Control Line states */
288 if (priv->last_msr & BELKIN_SA_MSR_DSR)
289 priv->control_state |= TIOCM_DSR;
291 priv->control_state &= ~TIOCM_DSR;
293 if (priv->last_msr & BELKIN_SA_MSR_CTS)
294 priv->control_state |= TIOCM_CTS;
296 priv->control_state &= ~TIOCM_CTS;
298 if (priv->last_msr & BELKIN_SA_MSR_RI)
299 priv->control_state |= TIOCM_RI;
301 priv->control_state &= ~TIOCM_RI;
303 if (priv->last_msr & BELKIN_SA_MSR_CD)
304 priv->control_state |= TIOCM_CD;
306 priv->control_state &= ~TIOCM_CD;
308 /* Now to report any errors */
309 priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
312 * fill in the flip buffer here, but I do not know the relation
313 * to the current/next receive buffer or characters. I need
314 * to look in to this before committing any code.
316 if (priv->last_lsr & BELKIN_SA_LSR_ERR) {
319 if (priv->last_lsr & BELKIN_SA_LSR_OE) {
322 if (priv->last_lsr & BELKIN_SA_LSR_PE) {
325 if (priv->last_lsr & BELKIN_SA_LSR_FE) {
327 /* Break Indicator */
328 if (priv->last_lsr & BELKIN_SA_LSR_BI) {
332 spin_unlock_irqrestore(&priv->lock, flags);
334 retval = usb_submit_urb (urb, GFP_ATOMIC);
336 err ("%s - usb_submit_urb failed with result %d",
337 __FUNCTION__, retval);
340 static void belkin_sa_set_termios (struct usb_serial_port *port, struct ktermios *old_termios)
342 struct usb_serial *serial = port->serial;
343 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
346 unsigned int old_iflag = 0;
347 unsigned int old_cflag = 0;
348 __u16 urb_value = 0; /* Will hold the new flags */
350 unsigned long control_state;
351 int bad_flow_control;
354 if ((!port->tty) || (!port->tty->termios)) {
355 dbg ("%s - no tty or termios structure", __FUNCTION__);
359 iflag = port->tty->termios->c_iflag;
360 cflag = port->tty->termios->c_cflag;
362 /* get a local copy of the current port settings */
363 spin_lock_irqsave(&priv->lock, flags);
364 control_state = priv->control_state;
365 bad_flow_control = priv->bad_flow_control;
366 spin_unlock_irqrestore(&priv->lock, flags);
368 old_iflag = old_termios->c_iflag;
369 old_cflag = old_termios->c_cflag;
371 /* Set the baud rate */
372 if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
373 /* reassert DTR and (maybe) RTS on transition from B0 */
374 if( (old_cflag&CBAUD) == B0 ) {
375 control_state |= (TIOCM_DTR|TIOCM_RTS);
376 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
377 err("Set DTR error");
378 /* don't set RTS if using hardware flow control */
379 if (!(old_cflag&CRTSCTS) )
380 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 1) < 0)
381 err("Set RTS error");
385 baud = tty_get_baud_rate(port->tty);
387 dbg("%s - tty_get_baud_rate says 0 baud", __FUNCTION__);
390 urb_value = BELKIN_SA_BAUD(baud);
391 /* Clip to maximum speed */
394 /* Turn it back into a resulting real baud rate */
395 baud = BELKIN_SA_BAUD(urb_value);
396 /* FIXME: Once the tty updates are done then push this back to the tty */
398 if ((cflag & CBAUD) != B0 ) {
399 if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
400 err("Set baudrate error");
402 /* Disable flow control */
403 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
404 err("Disable flowcontrol error");
405 /* Drop RTS and DTR */
406 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
407 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
408 err("DTR LOW error");
409 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
410 err("RTS LOW error");
414 if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
416 urb_value = (cflag & PARODD) ? BELKIN_SA_PARITY_ODD : BELKIN_SA_PARITY_EVEN;
418 urb_value = BELKIN_SA_PARITY_NONE;
419 if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
420 err("Set parity error");
423 /* set the number of data bits */
424 if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
425 switch (cflag & CSIZE) {
426 case CS5: urb_value = BELKIN_SA_DATA_BITS(5); break;
427 case CS6: urb_value = BELKIN_SA_DATA_BITS(6); break;
428 case CS7: urb_value = BELKIN_SA_DATA_BITS(7); break;
429 case CS8: urb_value = BELKIN_SA_DATA_BITS(8); break;
430 default: dbg("CSIZE was not CS5-CS8, using default of 8");
431 urb_value = BELKIN_SA_DATA_BITS(8);
434 if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
435 err("Set data bits error");
438 /* set the number of stop bits */
439 if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
440 urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2) : BELKIN_SA_STOP_BITS(1);
441 if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST, urb_value) < 0)
442 err("Set stop bits error");
445 /* Set flow control */
446 if( (iflag&IXOFF) != (old_iflag&IXOFF)
447 || (iflag&IXON) != (old_iflag&IXON)
448 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
450 if ((iflag & IXOFF) || (iflag & IXON))
451 urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
453 urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
456 urb_value |= (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
458 urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
460 if (bad_flow_control)
461 urb_value &= ~(BELKIN_SA_FLOW_IRTS);
463 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
464 err("Set flow control error");
467 /* save off the modified port settings */
468 spin_lock_irqsave(&priv->lock, flags);
469 priv->control_state = control_state;
470 spin_unlock_irqrestore(&priv->lock, flags);
471 } /* belkin_sa_set_termios */
474 static void belkin_sa_break_ctl( struct usb_serial_port *port, int break_state )
476 struct usb_serial *serial = port->serial;
478 if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
479 err("Set break_ctl %d", break_state);
483 static int belkin_sa_tiocmget (struct usb_serial_port *port, struct file *file)
485 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
486 unsigned long control_state;
489 dbg("%s", __FUNCTION__);
491 spin_lock_irqsave(&priv->lock, flags);
492 control_state = priv->control_state;
493 spin_unlock_irqrestore(&priv->lock, flags);
495 return control_state;
499 static int belkin_sa_tiocmset (struct usb_serial_port *port, struct file *file,
500 unsigned int set, unsigned int clear)
502 struct usb_serial *serial = port->serial;
503 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
504 unsigned long control_state;
510 dbg("%s", __FUNCTION__);
512 spin_lock_irqsave(&priv->lock, flags);
513 control_state = priv->control_state;
515 if (set & TIOCM_RTS) {
516 control_state |= TIOCM_RTS;
519 if (set & TIOCM_DTR) {
520 control_state |= TIOCM_DTR;
523 if (clear & TIOCM_RTS) {
524 control_state &= ~TIOCM_RTS;
527 if (clear & TIOCM_DTR) {
528 control_state &= ~TIOCM_DTR;
532 priv->control_state = control_state;
533 spin_unlock_irqrestore(&priv->lock, flags);
535 retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
537 err("Set RTS error %d", retval);
541 retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
543 err("Set DTR error %d", retval);
551 static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
555 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
560 /* return count of modemline transitions */
565 dbg("belkin_sa_ioctl arg not supported - 0x%04x",cmd);
566 return(-ENOIOCTLCMD);
570 } /* belkin_sa_ioctl */
573 static int __init belkin_sa_init (void)
576 retval = usb_serial_register(&belkin_device);
578 goto failed_usb_serial_register;
579 retval = usb_register(&belkin_driver);
581 goto failed_usb_register;
582 info(DRIVER_DESC " " DRIVER_VERSION);
585 usb_serial_deregister(&belkin_device);
586 failed_usb_serial_register:
591 static void __exit belkin_sa_exit (void)
593 usb_deregister (&belkin_driver);
594 usb_serial_deregister (&belkin_device);
598 module_init (belkin_sa_init);
599 module_exit (belkin_sa_exit);
601 MODULE_AUTHOR( DRIVER_AUTHOR );
602 MODULE_DESCRIPTION( DRIVER_DESC );
603 MODULE_VERSION( DRIVER_VERSION );
604 MODULE_LICENSE("GPL");
606 module_param(debug, bool, S_IRUGO | S_IWUSR);
607 MODULE_PARM_DESC(debug, "Debug enabled or not");