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 "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, struct pt_regs *regs);
95 static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios * 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 .id_table = id_table_combined,
130 .num_interrupt_in = 1,
134 .open = belkin_sa_open,
135 .close = belkin_sa_close,
136 .read_int_callback = belkin_sa_read_int_callback, /* How we get the status info */
137 .ioctl = belkin_sa_ioctl,
138 .set_termios = belkin_sa_set_termios,
139 .break_ctl = belkin_sa_break_ctl,
140 .tiocmget = belkin_sa_tiocmget,
141 .tiocmset = belkin_sa_tiocmset,
142 .attach = belkin_sa_startup,
143 .shutdown = belkin_sa_shutdown,
147 struct belkin_sa_private {
149 unsigned long control_state;
150 unsigned char last_lsr;
151 unsigned char last_msr;
152 int bad_flow_control;
157 * ***************************************************************************
158 * Belkin USB Serial Adapter F5U103 specific driver functions
159 * ***************************************************************************
162 #define WDR_TIMEOUT 5000 /* default urb timeout */
164 /* assumes that struct usb_serial *serial is available */
165 #define BSA_USB_CMD(c,v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
166 (c), BELKIN_SA_SET_REQUEST_TYPE, \
167 (v), 0, NULL, 0, WDR_TIMEOUT)
169 /* do some startup allocations not currently performed by usb_serial_probe() */
170 static int belkin_sa_startup (struct usb_serial *serial)
172 struct usb_device *dev = serial->dev;
173 struct belkin_sa_private *priv;
175 /* allocate the private data structure */
176 priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
178 return (-1); /* error */
179 /* set initial values for control structures */
180 spin_lock_init(&priv->lock);
181 priv->control_state = 0;
184 /* see comments at top of file */
185 priv->bad_flow_control = (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
186 info("bcdDevice: %04x, bfc: %d", le16_to_cpu(dev->descriptor.bcdDevice), priv->bad_flow_control);
188 init_waitqueue_head(&serial->port[0]->write_wait);
189 usb_set_serial_port_data(serial->port[0], priv);
195 static void belkin_sa_shutdown (struct usb_serial *serial)
197 struct belkin_sa_private *priv;
200 dbg ("%s", __FUNCTION__);
202 /* stop reads and writes on all ports */
203 for (i=0; i < serial->num_ports; ++i) {
204 /* My special items, the standard routines free my urbs */
205 priv = usb_get_serial_port_data(serial->port[i]);
211 static int belkin_sa_open (struct usb_serial_port *port, struct file *filp)
215 dbg("%s port %d", __FUNCTION__, port->number);
217 /*Start reading from the device*/
218 /* TODO: Look at possibility of submitting multiple URBs to device to
219 * enhance buffering. Win trace shows 16 initial read URBs.
221 port->read_urb->dev = port->serial->dev;
222 retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
224 err("usb_submit_urb(read bulk) failed");
228 port->interrupt_in_urb->dev = port->serial->dev;
229 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
231 usb_kill_urb(port->read_urb);
232 err(" usb_submit_urb(read int) failed");
237 } /* belkin_sa_open */
240 static void belkin_sa_close (struct usb_serial_port *port, struct file *filp)
242 dbg("%s port %d", __FUNCTION__, port->number);
244 /* shutdown our bulk reads and writes */
245 usb_kill_urb(port->write_urb);
246 usb_kill_urb(port->read_urb);
247 usb_kill_urb(port->interrupt_in_urb);
248 } /* belkin_sa_close */
251 static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs)
253 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
254 struct belkin_sa_private *priv;
255 unsigned char *data = urb->transfer_buffer;
259 switch (urb->status) {
266 /* this urb is terminated, clean up */
267 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
270 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
274 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
276 /* Handle known interrupt data */
277 /* ignore data[0] and data[1] */
279 priv = usb_get_serial_port_data(port);
280 spin_lock_irqsave(&priv->lock, flags);
281 priv->last_msr = data[BELKIN_SA_MSR_INDEX];
283 /* Record Control Line states */
284 if (priv->last_msr & BELKIN_SA_MSR_DSR)
285 priv->control_state |= TIOCM_DSR;
287 priv->control_state &= ~TIOCM_DSR;
289 if (priv->last_msr & BELKIN_SA_MSR_CTS)
290 priv->control_state |= TIOCM_CTS;
292 priv->control_state &= ~TIOCM_CTS;
294 if (priv->last_msr & BELKIN_SA_MSR_RI)
295 priv->control_state |= TIOCM_RI;
297 priv->control_state &= ~TIOCM_RI;
299 if (priv->last_msr & BELKIN_SA_MSR_CD)
300 priv->control_state |= TIOCM_CD;
302 priv->control_state &= ~TIOCM_CD;
304 /* Now to report any errors */
305 priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
308 * fill in the flip buffer here, but I do not know the relation
309 * to the current/next receive buffer or characters. I need
310 * to look in to this before committing any code.
312 if (priv->last_lsr & BELKIN_SA_LSR_ERR) {
315 if (priv->last_lsr & BELKIN_SA_LSR_OE) {
318 if (priv->last_lsr & BELKIN_SA_LSR_PE) {
321 if (priv->last_lsr & BELKIN_SA_LSR_FE) {
323 /* Break Indicator */
324 if (priv->last_lsr & BELKIN_SA_LSR_BI) {
328 spin_unlock_irqrestore(&priv->lock, flags);
330 retval = usb_submit_urb (urb, GFP_ATOMIC);
332 err ("%s - usb_submit_urb failed with result %d",
333 __FUNCTION__, retval);
336 static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios *old_termios)
338 struct usb_serial *serial = port->serial;
339 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
342 unsigned int old_iflag = 0;
343 unsigned int old_cflag = 0;
344 __u16 urb_value = 0; /* Will hold the new flags */
346 unsigned long control_state;
347 int bad_flow_control;
349 if ((!port->tty) || (!port->tty->termios)) {
350 dbg ("%s - no tty or termios structure", __FUNCTION__);
354 iflag = port->tty->termios->c_iflag;
355 cflag = port->tty->termios->c_cflag;
357 /* get a local copy of the current port settings */
358 spin_lock_irqsave(&priv->lock, flags);
359 control_state = priv->control_state;
360 bad_flow_control = priv->bad_flow_control;
361 spin_unlock_irqrestore(&priv->lock, flags);
363 /* check that they really want us to change something */
365 if ((cflag == old_termios->c_cflag) &&
366 (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
367 dbg("%s - nothing to change...", __FUNCTION__);
370 old_iflag = old_termios->c_iflag;
371 old_cflag = old_termios->c_cflag;
374 /* Set the baud rate */
375 if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
376 /* reassert DTR and (maybe) RTS on transition from B0 */
377 if( (old_cflag&CBAUD) == B0 ) {
378 control_state |= (TIOCM_DTR|TIOCM_RTS);
379 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
380 err("Set DTR error");
381 /* don't set RTS if using hardware flow control */
382 if (!(old_cflag&CRTSCTS) )
383 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 1) < 0)
384 err("Set RTS error");
387 switch(cflag & CBAUD) {
388 case B0: /* handled below */ break;
389 case B300: urb_value = BELKIN_SA_BAUD(300); break;
390 case B600: urb_value = BELKIN_SA_BAUD(600); break;
391 case B1200: urb_value = BELKIN_SA_BAUD(1200); break;
392 case B2400: urb_value = BELKIN_SA_BAUD(2400); break;
393 case B4800: urb_value = BELKIN_SA_BAUD(4800); break;
394 case B9600: urb_value = BELKIN_SA_BAUD(9600); break;
395 case B19200: urb_value = BELKIN_SA_BAUD(19200); break;
396 case B38400: urb_value = BELKIN_SA_BAUD(38400); break;
397 case B57600: urb_value = BELKIN_SA_BAUD(57600); break;
398 case B115200: urb_value = BELKIN_SA_BAUD(115200); break;
399 case B230400: urb_value = BELKIN_SA_BAUD(230400); break;
400 default: err("BELKIN USB Serial Adapter: unsupported baudrate request, using default of 9600");
401 urb_value = BELKIN_SA_BAUD(9600); break;
403 if ((cflag & CBAUD) != B0 ) {
404 if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
405 err("Set baudrate error");
407 /* Disable flow control */
408 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
409 err("Disable flowcontrol error");
411 /* Drop RTS and DTR */
412 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
413 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
414 err("DTR LOW error");
415 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
416 err("RTS LOW error");
421 if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
423 urb_value = (cflag & PARODD) ? BELKIN_SA_PARITY_ODD : BELKIN_SA_PARITY_EVEN;
425 urb_value = BELKIN_SA_PARITY_NONE;
426 if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
427 err("Set parity error");
430 /* set the number of data bits */
431 if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
432 switch (cflag & CSIZE) {
433 case CS5: urb_value = BELKIN_SA_DATA_BITS(5); break;
434 case CS6: urb_value = BELKIN_SA_DATA_BITS(6); break;
435 case CS7: urb_value = BELKIN_SA_DATA_BITS(7); break;
436 case CS8: urb_value = BELKIN_SA_DATA_BITS(8); break;
437 default: err("CSIZE was not CS5-CS8, using default of 8");
438 urb_value = BELKIN_SA_DATA_BITS(8);
441 if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
442 err("Set data bits error");
445 /* set the number of stop bits */
446 if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
447 urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2) : BELKIN_SA_STOP_BITS(1);
448 if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST, urb_value) < 0)
449 err("Set stop bits error");
452 /* Set flow control */
453 if( (iflag&IXOFF) != (old_iflag&IXOFF)
454 || (iflag&IXON) != (old_iflag&IXON)
455 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
457 if ((iflag & IXOFF) || (iflag & IXON))
458 urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
460 urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
463 urb_value |= (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
465 urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
467 if (bad_flow_control)
468 urb_value &= ~(BELKIN_SA_FLOW_IRTS);
470 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
471 err("Set flow control error");
474 /* save off the modified port settings */
475 spin_lock_irqsave(&priv->lock, flags);
476 priv->control_state = control_state;
477 spin_unlock_irqrestore(&priv->lock, flags);
478 } /* belkin_sa_set_termios */
481 static void belkin_sa_break_ctl( struct usb_serial_port *port, int break_state )
483 struct usb_serial *serial = port->serial;
485 if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
486 err("Set break_ctl %d", break_state);
490 static int belkin_sa_tiocmget (struct usb_serial_port *port, struct file *file)
492 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
493 unsigned long control_state;
496 dbg("%s", __FUNCTION__);
498 spin_lock_irqsave(&priv->lock, flags);
499 control_state = priv->control_state;
500 spin_unlock_irqrestore(&priv->lock, flags);
502 return control_state;
506 static int belkin_sa_tiocmset (struct usb_serial_port *port, struct file *file,
507 unsigned int set, unsigned int clear)
509 struct usb_serial *serial = port->serial;
510 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
511 unsigned long control_state;
517 dbg("%s", __FUNCTION__);
519 spin_lock_irqsave(&priv->lock, flags);
520 control_state = priv->control_state;
522 if (set & TIOCM_RTS) {
523 control_state |= TIOCM_RTS;
526 if (set & TIOCM_DTR) {
527 control_state |= TIOCM_DTR;
530 if (clear & TIOCM_RTS) {
531 control_state &= ~TIOCM_RTS;
534 if (clear & TIOCM_DTR) {
535 control_state &= ~TIOCM_DTR;
539 priv->control_state = control_state;
540 spin_unlock_irqrestore(&priv->lock, flags);
542 retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
544 err("Set RTS error %d", retval);
548 retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
550 err("Set DTR error %d", retval);
558 static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
562 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
567 /* return count of modemline transitions */
572 dbg("belkin_sa_ioctl arg not supported - 0x%04x",cmd);
573 return(-ENOIOCTLCMD);
577 } /* belkin_sa_ioctl */
580 static int __init belkin_sa_init (void)
583 retval = usb_serial_register(&belkin_device);
585 goto failed_usb_serial_register;
586 retval = usb_register(&belkin_driver);
588 goto failed_usb_register;
589 info(DRIVER_DESC " " DRIVER_VERSION);
592 usb_serial_deregister(&belkin_device);
593 failed_usb_serial_register:
598 static void __exit belkin_sa_exit (void)
600 usb_deregister (&belkin_driver);
601 usb_serial_deregister (&belkin_device);
605 module_init (belkin_sa_init);
606 module_exit (belkin_sa_exit);
608 MODULE_AUTHOR( DRIVER_AUTHOR );
609 MODULE_DESCRIPTION( DRIVER_DESC );
610 MODULE_VERSION( DRIVER_VERSION );
611 MODULE_LICENSE("GPL");
613 module_param(debug, bool, S_IRUGO | S_IWUSR);
614 MODULE_PARM_DESC(debug, "Debug enabled or not");