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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Belkin USB Serial Adapter Driver
4 *
5 * Copyright (C) 2000 William Greathouse (wgreathouse@smva.com)
6 * Copyright (C) 2000-2001 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
8 *
9 * This program is largely derived from work by the linux-usb group
10 * and associated source files. Please see the usb/serial files for
11 * individual credits and copyrights.
12 *
13 * See Documentation/usb/usb-serial.rst for more information on using this
14 * driver
15 *
16 * TODO:
17 * -- Add true modem control line query capability. Currently we track the
18 * states reported by the interrupt and the states we request.
19 * -- Add support for flush commands
20 */
21
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/slab.h>
25#include <linux/tty.h>
26#include <linux/tty_driver.h>
27#include <linux/tty_flip.h>
28#include <linux/module.h>
29#include <linux/spinlock.h>
30#include <linux/uaccess.h>
31#include <linux/usb.h>
32#include <linux/usb/serial.h>
33#include "belkin_sa.h"
34
35#define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
36#define DRIVER_DESC "USB Belkin Serial converter driver"
37
38/* function prototypes for a Belkin USB Serial Adapter F5U103 */
39static int belkin_sa_port_probe(struct usb_serial_port *port);
40static void belkin_sa_port_remove(struct usb_serial_port *port);
41static int belkin_sa_open(struct tty_struct *tty,
42 struct usb_serial_port *port);
43static void belkin_sa_close(struct usb_serial_port *port);
44static void belkin_sa_read_int_callback(struct urb *urb);
45static void belkin_sa_process_read_urb(struct urb *urb);
46static void belkin_sa_set_termios(struct tty_struct *tty,
47 struct usb_serial_port *port,
48 const struct ktermios *old_termios);
49static int belkin_sa_break_ctl(struct tty_struct *tty, int break_state);
50static int belkin_sa_tiocmget(struct tty_struct *tty);
51static int belkin_sa_tiocmset(struct tty_struct *tty,
52 unsigned int set, unsigned int clear);
53
54
55static const struct usb_device_id id_table[] = {
56 { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
57 { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
58 { USB_DEVICE(PERACOM_VID, PERACOM_PID) },
59 { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
60 { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
61 { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
62 { } /* Terminating entry */
63};
64MODULE_DEVICE_TABLE(usb, id_table);
65
66/* All of the device info needed for the serial converters */
67static struct usb_serial_driver belkin_device = {
68 .driver = {
69 .owner = THIS_MODULE,
70 .name = "belkin",
71 },
72 .description = "Belkin / Peracom / GoHubs USB Serial Adapter",
73 .id_table = id_table,
74 .num_ports = 1,
75 .open = belkin_sa_open,
76 .close = belkin_sa_close,
77 .read_int_callback = belkin_sa_read_int_callback,
78 .process_read_urb = belkin_sa_process_read_urb,
79 .set_termios = belkin_sa_set_termios,
80 .break_ctl = belkin_sa_break_ctl,
81 .tiocmget = belkin_sa_tiocmget,
82 .tiocmset = belkin_sa_tiocmset,
83 .port_probe = belkin_sa_port_probe,
84 .port_remove = belkin_sa_port_remove,
85};
86
87static struct usb_serial_driver * const serial_drivers[] = {
88 &belkin_device, NULL
89};
90
91struct belkin_sa_private {
92 spinlock_t lock;
93 unsigned long control_state;
94 unsigned char last_lsr;
95 unsigned char last_msr;
96 int bad_flow_control;
97};
98
99
100/*
101 * ***************************************************************************
102 * Belkin USB Serial Adapter F5U103 specific driver functions
103 * ***************************************************************************
104 */
105
106#define WDR_TIMEOUT 5000 /* default urb timeout */
107
108/* assumes that struct usb_serial *serial is available */
109#define BSA_USB_CMD(c, v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
110 (c), BELKIN_SA_SET_REQUEST_TYPE, \
111 (v), 0, NULL, 0, WDR_TIMEOUT)
112
113static int belkin_sa_port_probe(struct usb_serial_port *port)
114{
115 struct usb_device *dev = port->serial->dev;
116 struct belkin_sa_private *priv;
117
118 priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
119 if (!priv)
120 return -ENOMEM;
121
122 spin_lock_init(&priv->lock);
123 priv->control_state = 0;
124 priv->last_lsr = 0;
125 priv->last_msr = 0;
126 /* see comments at top of file */
127 priv->bad_flow_control =
128 (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
129 dev_info(&dev->dev, "bcdDevice: %04x, bfc: %d\n",
130 le16_to_cpu(dev->descriptor.bcdDevice),
131 priv->bad_flow_control);
132
133 usb_set_serial_port_data(port, priv);
134
135 return 0;
136}
137
138static void belkin_sa_port_remove(struct usb_serial_port *port)
139{
140 struct belkin_sa_private *priv;
141
142 priv = usb_get_serial_port_data(port);
143 kfree(priv);
144}
145
146static int belkin_sa_open(struct tty_struct *tty,
147 struct usb_serial_port *port)
148{
149 int retval;
150
151 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
152 if (retval) {
153 dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
154 return retval;
155 }
156
157 retval = usb_serial_generic_open(tty, port);
158 if (retval)
159 usb_kill_urb(port->interrupt_in_urb);
160
161 return retval;
162}
163
164static void belkin_sa_close(struct usb_serial_port *port)
165{
166 usb_serial_generic_close(port);
167 usb_kill_urb(port->interrupt_in_urb);
168}
169
170static void belkin_sa_read_int_callback(struct urb *urb)
171{
172 struct usb_serial_port *port = urb->context;
173 struct belkin_sa_private *priv;
174 unsigned char *data = urb->transfer_buffer;
175 int retval;
176 int status = urb->status;
177 unsigned long flags;
178
179 switch (status) {
180 case 0:
181 /* success */
182 break;
183 case -ECONNRESET:
184 case -ENOENT:
185 case -ESHUTDOWN:
186 /* this urb is terminated, clean up */
187 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
188 __func__, status);
189 return;
190 default:
191 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
192 __func__, status);
193 goto exit;
194 }
195
196 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
197
198 /* Handle known interrupt data */
199 /* ignore data[0] and data[1] */
200
201 priv = usb_get_serial_port_data(port);
202 spin_lock_irqsave(&priv->lock, flags);
203 priv->last_msr = data[BELKIN_SA_MSR_INDEX];
204
205 /* Record Control Line states */
206 if (priv->last_msr & BELKIN_SA_MSR_DSR)
207 priv->control_state |= TIOCM_DSR;
208 else
209 priv->control_state &= ~TIOCM_DSR;
210
211 if (priv->last_msr & BELKIN_SA_MSR_CTS)
212 priv->control_state |= TIOCM_CTS;
213 else
214 priv->control_state &= ~TIOCM_CTS;
215
216 if (priv->last_msr & BELKIN_SA_MSR_RI)
217 priv->control_state |= TIOCM_RI;
218 else
219 priv->control_state &= ~TIOCM_RI;
220
221 if (priv->last_msr & BELKIN_SA_MSR_CD)
222 priv->control_state |= TIOCM_CD;
223 else
224 priv->control_state &= ~TIOCM_CD;
225
226 priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
227 spin_unlock_irqrestore(&priv->lock, flags);
228exit:
229 retval = usb_submit_urb(urb, GFP_ATOMIC);
230 if (retval)
231 dev_err(&port->dev, "%s - usb_submit_urb failed with "
232 "result %d\n", __func__, retval);
233}
234
235static void belkin_sa_process_read_urb(struct urb *urb)
236{
237 struct usb_serial_port *port = urb->context;
238 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
239 unsigned char *data = urb->transfer_buffer;
240 unsigned long flags;
241 unsigned char status;
242 char tty_flag;
243
244 /* Update line status */
245 tty_flag = TTY_NORMAL;
246
247 spin_lock_irqsave(&priv->lock, flags);
248 status = priv->last_lsr;
249 priv->last_lsr &= ~BELKIN_SA_LSR_ERR;
250 spin_unlock_irqrestore(&priv->lock, flags);
251
252 if (!urb->actual_length)
253 return;
254
255 if (status & BELKIN_SA_LSR_ERR) {
256 /* Break takes precedence over parity, which takes precedence
257 * over framing errors. */
258 if (status & BELKIN_SA_LSR_BI)
259 tty_flag = TTY_BREAK;
260 else if (status & BELKIN_SA_LSR_PE)
261 tty_flag = TTY_PARITY;
262 else if (status & BELKIN_SA_LSR_FE)
263 tty_flag = TTY_FRAME;
264 dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);
265
266 /* Overrun is special, not associated with a char. */
267 if (status & BELKIN_SA_LSR_OE)
268 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
269 }
270
271 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
272 urb->actual_length);
273 tty_flip_buffer_push(&port->port);
274}
275
276static void belkin_sa_set_termios(struct tty_struct *tty,
277 struct usb_serial_port *port,
278 const struct ktermios *old_termios)
279{
280 struct usb_serial *serial = port->serial;
281 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
282 unsigned int iflag;
283 unsigned int cflag;
284 unsigned int old_iflag = 0;
285 unsigned int old_cflag = 0;
286 __u16 urb_value = 0; /* Will hold the new flags */
287 unsigned long flags;
288 unsigned long control_state;
289 int bad_flow_control;
290 speed_t baud;
291 struct ktermios *termios = &tty->termios;
292
293 iflag = termios->c_iflag;
294 cflag = termios->c_cflag;
295
296 termios->c_cflag &= ~CMSPAR;
297
298 /* get a local copy of the current port settings */
299 spin_lock_irqsave(&priv->lock, flags);
300 control_state = priv->control_state;
301 bad_flow_control = priv->bad_flow_control;
302 spin_unlock_irqrestore(&priv->lock, flags);
303
304 old_iflag = old_termios->c_iflag;
305 old_cflag = old_termios->c_cflag;
306
307 /* Set the baud rate */
308 if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
309 /* reassert DTR and (maybe) RTS on transition from B0 */
310 if ((old_cflag & CBAUD) == B0) {
311 control_state |= (TIOCM_DTR|TIOCM_RTS);
312 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
313 dev_err(&port->dev, "Set DTR error\n");
314 /* don't set RTS if using hardware flow control */
315 if (!(old_cflag & CRTSCTS))
316 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST
317 , 1) < 0)
318 dev_err(&port->dev, "Set RTS error\n");
319 }
320 }
321
322 baud = tty_get_baud_rate(tty);
323 if (baud) {
324 urb_value = BELKIN_SA_BAUD(baud);
325 /* Clip to maximum speed */
326 if (urb_value == 0)
327 urb_value = 1;
328 /* Turn it back into a resulting real baud rate */
329 baud = BELKIN_SA_BAUD(urb_value);
330
331 /* Report the actual baud rate back to the caller */
332 tty_encode_baud_rate(tty, baud, baud);
333 if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
334 dev_err(&port->dev, "Set baudrate error\n");
335 } else {
336 /* Disable flow control */
337 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST,
338 BELKIN_SA_FLOW_NONE) < 0)
339 dev_err(&port->dev, "Disable flowcontrol error\n");
340 /* Drop RTS and DTR */
341 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
342 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
343 dev_err(&port->dev, "DTR LOW error\n");
344 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
345 dev_err(&port->dev, "RTS LOW error\n");
346 }
347
348 /* set the parity */
349 if ((cflag ^ old_cflag) & (PARENB | PARODD)) {
350 if (cflag & PARENB)
351 urb_value = (cflag & PARODD) ? BELKIN_SA_PARITY_ODD
352 : BELKIN_SA_PARITY_EVEN;
353 else
354 urb_value = BELKIN_SA_PARITY_NONE;
355 if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
356 dev_err(&port->dev, "Set parity error\n");
357 }
358
359 /* set the number of data bits */
360 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
361 urb_value = BELKIN_SA_DATA_BITS(tty_get_char_size(cflag));
362 if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
363 dev_err(&port->dev, "Set data bits error\n");
364 }
365
366 /* set the number of stop bits */
367 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
368 urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2)
369 : BELKIN_SA_STOP_BITS(1);
370 if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST,
371 urb_value) < 0)
372 dev_err(&port->dev, "Set stop bits error\n");
373 }
374
375 /* Set flow control */
376 if (((iflag ^ old_iflag) & (IXOFF | IXON)) ||
377 ((cflag ^ old_cflag) & CRTSCTS)) {
378 urb_value = 0;
379 if ((iflag & IXOFF) || (iflag & IXON))
380 urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
381 else
382 urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
383
384 if (cflag & CRTSCTS)
385 urb_value |= (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
386 else
387 urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
388
389 if (bad_flow_control)
390 urb_value &= ~(BELKIN_SA_FLOW_IRTS);
391
392 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
393 dev_err(&port->dev, "Set flow control error\n");
394 }
395
396 /* save off the modified port settings */
397 spin_lock_irqsave(&priv->lock, flags);
398 priv->control_state = control_state;
399 spin_unlock_irqrestore(&priv->lock, flags);
400}
401
402static int belkin_sa_break_ctl(struct tty_struct *tty, int break_state)
403{
404 struct usb_serial_port *port = tty->driver_data;
405 struct usb_serial *serial = port->serial;
406 int ret;
407
408 ret = BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0);
409 if (ret < 0) {
410 dev_err(&port->dev, "Set break_ctl %d\n", break_state);
411 return ret;
412 }
413
414 return 0;
415}
416
417static int belkin_sa_tiocmget(struct tty_struct *tty)
418{
419 struct usb_serial_port *port = tty->driver_data;
420 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
421 unsigned long control_state;
422 unsigned long flags;
423
424 spin_lock_irqsave(&priv->lock, flags);
425 control_state = priv->control_state;
426 spin_unlock_irqrestore(&priv->lock, flags);
427
428 return control_state;
429}
430
431static int belkin_sa_tiocmset(struct tty_struct *tty,
432 unsigned int set, unsigned int clear)
433{
434 struct usb_serial_port *port = tty->driver_data;
435 struct usb_serial *serial = port->serial;
436 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
437 unsigned long control_state;
438 unsigned long flags;
439 int retval;
440 int rts = 0;
441 int dtr = 0;
442
443 spin_lock_irqsave(&priv->lock, flags);
444 control_state = priv->control_state;
445
446 if (set & TIOCM_RTS) {
447 control_state |= TIOCM_RTS;
448 rts = 1;
449 }
450 if (set & TIOCM_DTR) {
451 control_state |= TIOCM_DTR;
452 dtr = 1;
453 }
454 if (clear & TIOCM_RTS) {
455 control_state &= ~TIOCM_RTS;
456 rts = 0;
457 }
458 if (clear & TIOCM_DTR) {
459 control_state &= ~TIOCM_DTR;
460 dtr = 0;
461 }
462
463 priv->control_state = control_state;
464 spin_unlock_irqrestore(&priv->lock, flags);
465
466 retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
467 if (retval < 0) {
468 dev_err(&port->dev, "Set RTS error %d\n", retval);
469 goto exit;
470 }
471
472 retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
473 if (retval < 0) {
474 dev_err(&port->dev, "Set DTR error %d\n", retval);
475 goto exit;
476 }
477exit:
478 return retval;
479}
480
481module_usb_serial_driver(serial_drivers, id_table);
482
483MODULE_AUTHOR(DRIVER_AUTHOR);
484MODULE_DESCRIPTION(DRIVER_DESC);
485MODULE_LICENSE("GPL");
1/*
2 * Belkin USB Serial Adapter Driver
3 *
4 * Copyright (C) 2000 William Greathouse (wgreathouse@smva.com)
5 * Copyright (C) 2000-2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
7 *
8 * This program is largely derived from work by the linux-usb group
9 * and associated source files. Please see the usb/serial files for
10 * individual credits and copyrights.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * See Documentation/usb/usb-serial.txt for more information on using this
18 * driver
19 *
20 * TODO:
21 * -- Add true modem contol line query capability. Currently we track the
22 * states reported by the interrupt and the states we request.
23 * -- Add support for flush commands
24 */
25
26#include <linux/kernel.h>
27#include <linux/errno.h>
28#include <linux/init.h>
29#include <linux/slab.h>
30#include <linux/tty.h>
31#include <linux/tty_driver.h>
32#include <linux/tty_flip.h>
33#include <linux/module.h>
34#include <linux/spinlock.h>
35#include <linux/uaccess.h>
36#include <linux/usb.h>
37#include <linux/usb/serial.h>
38#include "belkin_sa.h"
39
40static bool debug;
41
42/*
43 * Version Information
44 */
45#define DRIVER_VERSION "v1.3"
46#define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
47#define DRIVER_DESC "USB Belkin Serial converter driver"
48
49/* function prototypes for a Belkin USB Serial Adapter F5U103 */
50static int belkin_sa_startup(struct usb_serial *serial);
51static void belkin_sa_release(struct usb_serial *serial);
52static int belkin_sa_open(struct tty_struct *tty,
53 struct usb_serial_port *port);
54static void belkin_sa_close(struct usb_serial_port *port);
55static void belkin_sa_read_int_callback(struct urb *urb);
56static void belkin_sa_process_read_urb(struct urb *urb);
57static void belkin_sa_set_termios(struct tty_struct *tty,
58 struct usb_serial_port *port, struct ktermios * old);
59static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state);
60static int belkin_sa_tiocmget(struct tty_struct *tty);
61static int belkin_sa_tiocmset(struct tty_struct *tty,
62 unsigned int set, unsigned int clear);
63
64
65static const struct usb_device_id id_table[] = {
66 { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
67 { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
68 { USB_DEVICE(PERACOM_VID, PERACOM_PID) },
69 { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
70 { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
71 { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
72 { } /* Terminating entry */
73};
74MODULE_DEVICE_TABLE(usb, id_table);
75
76/* All of the device info needed for the serial converters */
77static struct usb_serial_driver belkin_device = {
78 .driver = {
79 .owner = THIS_MODULE,
80 .name = "belkin",
81 },
82 .description = "Belkin / Peracom / GoHubs USB Serial Adapter",
83 .id_table = id_table,
84 .num_ports = 1,
85 .open = belkin_sa_open,
86 .close = belkin_sa_close,
87 .read_int_callback = belkin_sa_read_int_callback,
88 .process_read_urb = belkin_sa_process_read_urb,
89 .set_termios = belkin_sa_set_termios,
90 .break_ctl = belkin_sa_break_ctl,
91 .tiocmget = belkin_sa_tiocmget,
92 .tiocmset = belkin_sa_tiocmset,
93 .attach = belkin_sa_startup,
94 .release = belkin_sa_release,
95};
96
97static struct usb_serial_driver * const serial_drivers[] = {
98 &belkin_device, NULL
99};
100
101struct belkin_sa_private {
102 spinlock_t lock;
103 unsigned long control_state;
104 unsigned char last_lsr;
105 unsigned char last_msr;
106 int bad_flow_control;
107};
108
109
110/*
111 * ***************************************************************************
112 * Belkin USB Serial Adapter F5U103 specific driver functions
113 * ***************************************************************************
114 */
115
116#define WDR_TIMEOUT 5000 /* default urb timeout */
117
118/* assumes that struct usb_serial *serial is available */
119#define BSA_USB_CMD(c, v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
120 (c), BELKIN_SA_SET_REQUEST_TYPE, \
121 (v), 0, NULL, 0, WDR_TIMEOUT)
122
123/* do some startup allocations not currently performed by usb_serial_probe() */
124static int belkin_sa_startup(struct usb_serial *serial)
125{
126 struct usb_device *dev = serial->dev;
127 struct belkin_sa_private *priv;
128
129 /* allocate the private data structure */
130 priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
131 if (!priv)
132 return -1; /* error */
133 /* set initial values for control structures */
134 spin_lock_init(&priv->lock);
135 priv->control_state = 0;
136 priv->last_lsr = 0;
137 priv->last_msr = 0;
138 /* see comments at top of file */
139 priv->bad_flow_control =
140 (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
141 dev_info(&dev->dev, "bcdDevice: %04x, bfc: %d\n",
142 le16_to_cpu(dev->descriptor.bcdDevice),
143 priv->bad_flow_control);
144
145 init_waitqueue_head(&serial->port[0]->write_wait);
146 usb_set_serial_port_data(serial->port[0], priv);
147
148 return 0;
149}
150
151static void belkin_sa_release(struct usb_serial *serial)
152{
153 int i;
154
155 for (i = 0; i < serial->num_ports; ++i)
156 kfree(usb_get_serial_port_data(serial->port[i]));
157}
158
159static int belkin_sa_open(struct tty_struct *tty,
160 struct usb_serial_port *port)
161{
162 int retval;
163
164 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
165 if (retval) {
166 dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
167 return retval;
168 }
169
170 retval = usb_serial_generic_open(tty, port);
171 if (retval)
172 usb_kill_urb(port->interrupt_in_urb);
173
174 return retval;
175}
176
177static void belkin_sa_close(struct usb_serial_port *port)
178{
179 usb_serial_generic_close(port);
180 usb_kill_urb(port->interrupt_in_urb);
181}
182
183static void belkin_sa_read_int_callback(struct urb *urb)
184{
185 struct usb_serial_port *port = urb->context;
186 struct belkin_sa_private *priv;
187 unsigned char *data = urb->transfer_buffer;
188 int retval;
189 int status = urb->status;
190 unsigned long flags;
191
192 switch (status) {
193 case 0:
194 /* success */
195 break;
196 case -ECONNRESET:
197 case -ENOENT:
198 case -ESHUTDOWN:
199 /* this urb is terminated, clean up */
200 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
201 __func__, status);
202 return;
203 default:
204 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
205 __func__, status);
206 goto exit;
207 }
208
209 usb_serial_debug_data(debug, &port->dev, __func__,
210 urb->actual_length, data);
211
212 /* Handle known interrupt data */
213 /* ignore data[0] and data[1] */
214
215 priv = usb_get_serial_port_data(port);
216 spin_lock_irqsave(&priv->lock, flags);
217 priv->last_msr = data[BELKIN_SA_MSR_INDEX];
218
219 /* Record Control Line states */
220 if (priv->last_msr & BELKIN_SA_MSR_DSR)
221 priv->control_state |= TIOCM_DSR;
222 else
223 priv->control_state &= ~TIOCM_DSR;
224
225 if (priv->last_msr & BELKIN_SA_MSR_CTS)
226 priv->control_state |= TIOCM_CTS;
227 else
228 priv->control_state &= ~TIOCM_CTS;
229
230 if (priv->last_msr & BELKIN_SA_MSR_RI)
231 priv->control_state |= TIOCM_RI;
232 else
233 priv->control_state &= ~TIOCM_RI;
234
235 if (priv->last_msr & BELKIN_SA_MSR_CD)
236 priv->control_state |= TIOCM_CD;
237 else
238 priv->control_state &= ~TIOCM_CD;
239
240 priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
241 spin_unlock_irqrestore(&priv->lock, flags);
242exit:
243 retval = usb_submit_urb(urb, GFP_ATOMIC);
244 if (retval)
245 dev_err(&port->dev, "%s - usb_submit_urb failed with "
246 "result %d\n", __func__, retval);
247}
248
249static void belkin_sa_process_read_urb(struct urb *urb)
250{
251 struct usb_serial_port *port = urb->context;
252 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
253 struct tty_struct *tty;
254 unsigned char *data = urb->transfer_buffer;
255 unsigned long flags;
256 unsigned char status;
257 char tty_flag;
258
259 /* Update line status */
260 tty_flag = TTY_NORMAL;
261
262 spin_lock_irqsave(&priv->lock, flags);
263 status = priv->last_lsr;
264 priv->last_lsr &= ~BELKIN_SA_LSR_ERR;
265 spin_unlock_irqrestore(&priv->lock, flags);
266
267 if (!urb->actual_length)
268 return;
269
270 tty = tty_port_tty_get(&port->port);
271 if (!tty)
272 return;
273
274 if (status & BELKIN_SA_LSR_ERR) {
275 /* Break takes precedence over parity, which takes precedence
276 * over framing errors. */
277 if (status & BELKIN_SA_LSR_BI)
278 tty_flag = TTY_BREAK;
279 else if (status & BELKIN_SA_LSR_PE)
280 tty_flag = TTY_PARITY;
281 else if (status & BELKIN_SA_LSR_FE)
282 tty_flag = TTY_FRAME;
283 dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);
284
285 /* Overrun is special, not associated with a char. */
286 if (status & BELKIN_SA_LSR_OE)
287 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
288 }
289
290 tty_insert_flip_string_fixed_flag(tty, data, tty_flag,
291 urb->actual_length);
292 tty_flip_buffer_push(tty);
293 tty_kref_put(tty);
294}
295
296static void belkin_sa_set_termios(struct tty_struct *tty,
297 struct usb_serial_port *port, struct ktermios *old_termios)
298{
299 struct usb_serial *serial = port->serial;
300 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
301 unsigned int iflag;
302 unsigned int cflag;
303 unsigned int old_iflag = 0;
304 unsigned int old_cflag = 0;
305 __u16 urb_value = 0; /* Will hold the new flags */
306 unsigned long flags;
307 unsigned long control_state;
308 int bad_flow_control;
309 speed_t baud;
310 struct ktermios *termios = tty->termios;
311
312 iflag = termios->c_iflag;
313 cflag = termios->c_cflag;
314
315 termios->c_cflag &= ~CMSPAR;
316
317 /* get a local copy of the current port settings */
318 spin_lock_irqsave(&priv->lock, flags);
319 control_state = priv->control_state;
320 bad_flow_control = priv->bad_flow_control;
321 spin_unlock_irqrestore(&priv->lock, flags);
322
323 old_iflag = old_termios->c_iflag;
324 old_cflag = old_termios->c_cflag;
325
326 /* Set the baud rate */
327 if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
328 /* reassert DTR and (maybe) RTS on transition from B0 */
329 if ((old_cflag & CBAUD) == B0) {
330 control_state |= (TIOCM_DTR|TIOCM_RTS);
331 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
332 dev_err(&port->dev, "Set DTR error\n");
333 /* don't set RTS if using hardware flow control */
334 if (!(old_cflag & CRTSCTS))
335 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST
336 , 1) < 0)
337 dev_err(&port->dev, "Set RTS error\n");
338 }
339 }
340
341 baud = tty_get_baud_rate(tty);
342 if (baud) {
343 urb_value = BELKIN_SA_BAUD(baud);
344 /* Clip to maximum speed */
345 if (urb_value == 0)
346 urb_value = 1;
347 /* Turn it back into a resulting real baud rate */
348 baud = BELKIN_SA_BAUD(urb_value);
349
350 /* Report the actual baud rate back to the caller */
351 tty_encode_baud_rate(tty, baud, baud);
352 if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
353 dev_err(&port->dev, "Set baudrate error\n");
354 } else {
355 /* Disable flow control */
356 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST,
357 BELKIN_SA_FLOW_NONE) < 0)
358 dev_err(&port->dev, "Disable flowcontrol error\n");
359 /* Drop RTS and DTR */
360 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
361 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
362 dev_err(&port->dev, "DTR LOW error\n");
363 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
364 dev_err(&port->dev, "RTS LOW error\n");
365 }
366
367 /* set the parity */
368 if ((cflag ^ old_cflag) & (PARENB | PARODD)) {
369 if (cflag & PARENB)
370 urb_value = (cflag & PARODD) ? BELKIN_SA_PARITY_ODD
371 : BELKIN_SA_PARITY_EVEN;
372 else
373 urb_value = BELKIN_SA_PARITY_NONE;
374 if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
375 dev_err(&port->dev, "Set parity error\n");
376 }
377
378 /* set the number of data bits */
379 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
380 switch (cflag & CSIZE) {
381 case CS5:
382 urb_value = BELKIN_SA_DATA_BITS(5);
383 break;
384 case CS6:
385 urb_value = BELKIN_SA_DATA_BITS(6);
386 break;
387 case CS7:
388 urb_value = BELKIN_SA_DATA_BITS(7);
389 break;
390 case CS8:
391 urb_value = BELKIN_SA_DATA_BITS(8);
392 break;
393 default:
394 dev_dbg(&port->dev,
395 "CSIZE was not CS5-CS8, using default of 8\n");
396 urb_value = BELKIN_SA_DATA_BITS(8);
397 break;
398 }
399 if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
400 dev_err(&port->dev, "Set data bits error\n");
401 }
402
403 /* set the number of stop bits */
404 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
405 urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2)
406 : BELKIN_SA_STOP_BITS(1);
407 if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST,
408 urb_value) < 0)
409 dev_err(&port->dev, "Set stop bits error\n");
410 }
411
412 /* Set flow control */
413 if (((iflag ^ old_iflag) & (IXOFF | IXON)) ||
414 ((cflag ^ old_cflag) & CRTSCTS)) {
415 urb_value = 0;
416 if ((iflag & IXOFF) || (iflag & IXON))
417 urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
418 else
419 urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
420
421 if (cflag & CRTSCTS)
422 urb_value |= (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
423 else
424 urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
425
426 if (bad_flow_control)
427 urb_value &= ~(BELKIN_SA_FLOW_IRTS);
428
429 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
430 dev_err(&port->dev, "Set flow control error\n");
431 }
432
433 /* save off the modified port settings */
434 spin_lock_irqsave(&priv->lock, flags);
435 priv->control_state = control_state;
436 spin_unlock_irqrestore(&priv->lock, flags);
437}
438
439static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state)
440{
441 struct usb_serial_port *port = tty->driver_data;
442 struct usb_serial *serial = port->serial;
443
444 if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
445 dev_err(&port->dev, "Set break_ctl %d\n", break_state);
446}
447
448static int belkin_sa_tiocmget(struct tty_struct *tty)
449{
450 struct usb_serial_port *port = tty->driver_data;
451 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
452 unsigned long control_state;
453 unsigned long flags;
454
455 spin_lock_irqsave(&priv->lock, flags);
456 control_state = priv->control_state;
457 spin_unlock_irqrestore(&priv->lock, flags);
458
459 return control_state;
460}
461
462static int belkin_sa_tiocmset(struct tty_struct *tty,
463 unsigned int set, unsigned int clear)
464{
465 struct usb_serial_port *port = tty->driver_data;
466 struct usb_serial *serial = port->serial;
467 struct belkin_sa_private *priv = usb_get_serial_port_data(port);
468 unsigned long control_state;
469 unsigned long flags;
470 int retval;
471 int rts = 0;
472 int dtr = 0;
473
474 spin_lock_irqsave(&priv->lock, flags);
475 control_state = priv->control_state;
476
477 if (set & TIOCM_RTS) {
478 control_state |= TIOCM_RTS;
479 rts = 1;
480 }
481 if (set & TIOCM_DTR) {
482 control_state |= TIOCM_DTR;
483 dtr = 1;
484 }
485 if (clear & TIOCM_RTS) {
486 control_state &= ~TIOCM_RTS;
487 rts = 0;
488 }
489 if (clear & TIOCM_DTR) {
490 control_state &= ~TIOCM_DTR;
491 dtr = 0;
492 }
493
494 priv->control_state = control_state;
495 spin_unlock_irqrestore(&priv->lock, flags);
496
497 retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
498 if (retval < 0) {
499 dev_err(&port->dev, "Set RTS error %d\n", retval);
500 goto exit;
501 }
502
503 retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
504 if (retval < 0) {
505 dev_err(&port->dev, "Set DTR error %d\n", retval);
506 goto exit;
507 }
508exit:
509 return retval;
510}
511
512module_usb_serial_driver(serial_drivers, id_table);
513
514MODULE_AUTHOR(DRIVER_AUTHOR);
515MODULE_DESCRIPTION(DRIVER_DESC);
516MODULE_VERSION(DRIVER_VERSION);
517MODULE_LICENSE("GPL");
518
519module_param(debug, bool, S_IRUGO | S_IWUSR);
520MODULE_PARM_DESC(debug, "Debug enabled or not");