serial2002.c revision 5f74ea14c07fee91d3bdbaad88bff6264c6200e6 
1/*
2    comedi/drivers/serial2002.c
3    Skeleton code for a Comedi driver
4
5    COMEDI - Linux Control and Measurement Device Interface
6    Copyright (C) 2002 Anders Blomdell <anders.blomdell@control.lth.se>
7
8    This program is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 2 of the License, or
11    (at your option) any later version.
12
13    This program is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17
18    You should have received a copy of the GNU General Public License
19    along with this program; if not, write to the Free Software
20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21
22*/
23
24/*
25Driver: serial2002
26Description: Driver for serial connected hardware
27Devices:
28Author: Anders Blomdell
29Updated: Fri,  7 Jun 2002 12:56:45 -0700
30Status: in development
31
32*/
33
34#include "../comedidev.h"
35
36#include <linux/delay.h>
37#include <linux/ioport.h>
38
39#include <asm/termios.h>
40#include <asm/ioctls.h>
41#include <linux/serial.h>
42#include <linux/poll.h>
43
44/*
45 * Board descriptions for two imaginary boards.  Describing the
46 * boards in this way is optional, and completely driver-dependent.
47 * Some drivers use arrays such as this, other do not.
48 */
49struct serial2002_board {
50	const char *name;
51};
52
53static const struct serial2002_board serial2002_boards[] = {
54	{
55	.name = "serial2002"}
56};
57
58/*
59 * Useful for shorthand access to the particular board structure
60 */
61#define thisboard ((const struct serial2002_board *)dev->board_ptr)
62
63struct serial2002_range_table_t {
64
65	/*  HACK... */
66	int length;
67	struct comedi_krange range;
68};
69
70
71struct serial2002_private {
72
73	int port;		/*  /dev/ttyS<port> */
74	int speed;		/*  baudrate */
75	struct file *tty;
76	unsigned int ao_readback[32];
77	unsigned char digital_in_mapping[32];
78	unsigned char digital_out_mapping[32];
79	unsigned char analog_in_mapping[32];
80	unsigned char analog_out_mapping[32];
81	unsigned char encoder_in_mapping[32];
82	struct serial2002_range_table_t in_range[32], out_range[32];
83};
84
85
86/*
87 * most drivers define the following macro to make it easy to
88 * access the private structure.
89 */
90#define devpriv ((struct serial2002_private *)dev->private)
91
92static int serial2002_attach(struct comedi_device *dev, struct comedi_devconfig *it);
93static int serial2002_detach(struct comedi_device *dev);
94struct comedi_driver driver_serial2002 = {
95	.driver_name = "serial2002",
96	.module = THIS_MODULE,
97	.attach = serial2002_attach,
98	.detach = serial2002_detach,
99	.board_name = &serial2002_boards[0].name,
100	.offset = sizeof(struct serial2002_board),
101	.num_names = ARRAY_SIZE(serial2002_boards),
102};
103
104static int serial2002_di_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
105	struct comedi_insn *insn, unsigned int *data);
106static int serial2002_do_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
107	struct comedi_insn *insn, unsigned int *data);
108static int serial2002_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
109	struct comedi_insn *insn, unsigned int *data);
110static int serial2002_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
111	struct comedi_insn *insn, unsigned int *data);
112static int serial2002_ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
113	struct comedi_insn *insn, unsigned int *data);
114
115struct serial_data {
116	enum { is_invalid, is_digital, is_channel } kind;
117	int index;
118	unsigned long value;
119};
120
121static long tty_ioctl(struct file *f, unsigned op, unsigned long param)
122{
123#ifdef HAVE_UNLOCKED_IOCTL
124	if (f->f_op->unlocked_ioctl) {
125		return f->f_op->unlocked_ioctl(f, op, param);
126	}
127#endif
128	if (f->f_op->ioctl) {
129		return f->f_op->ioctl(f->f_dentry->d_inode, f, op, param);
130	}
131	return -ENOSYS;
132}
133
134static int tty_write(struct file *f, unsigned char *buf, int count)
135{
136	int result;
137	mm_segment_t oldfs;
138
139	oldfs = get_fs();
140	set_fs(KERNEL_DS);
141	f->f_pos = 0;
142	result = f->f_op->write(f, buf, count, &f->f_pos);
143	set_fs(oldfs);
144	return result;
145}
146
147#if 0
148/*
149 * On 2.6.26.3 this occaisonally gave me page faults, worked around by
150 * settings.c_cc[VMIN] = 0; settings.c_cc[VTIME] = 0
151 */
152static int tty_available(struct file *f)
153{
154	long result = 0;
155	mm_segment_t oldfs;
156
157	oldfs = get_fs();
158	set_fs(KERNEL_DS);
159	tty_ioctl(f, FIONREAD, (unsigned long)&result);
160	set_fs(oldfs);
161	return result;
162}
163#endif
164
165static int tty_read(struct file *f, int timeout)
166{
167	int result;
168
169	result = -1;
170	if (!IS_ERR(f)) {
171		mm_segment_t oldfs;
172
173		oldfs = get_fs();
174		set_fs(KERNEL_DS);
175		if (f->f_op->poll) {
176			struct poll_wqueues table;
177			struct timeval start, now;
178
179			do_gettimeofday(&start);
180			poll_initwait(&table);
181			while (1) {
182				long elapsed;
183				int mask;
184
185				mask = f->f_op->poll(f, &table.pt);
186				if (mask & (POLLRDNORM | POLLRDBAND | POLLIN |
187						POLLHUP | POLLERR)) {
188					break;
189				}
190				do_gettimeofday(&now);
191				elapsed =
192					(1000000 * (now.tv_sec - start.tv_sec) +
193					now.tv_usec - start.tv_usec);
194				if (elapsed > timeout) {
195					break;
196				}
197				set_current_state(TASK_INTERRUPTIBLE);
198				schedule_timeout(((timeout -
199							elapsed) * HZ) / 10000);
200			}
201			poll_freewait(&table);
202			{
203			  unsigned char ch;
204
205			  f->f_pos = 0;
206			  if (f->f_op->read(f, &ch, 1, &f->f_pos) == 1) {
207			    result = ch;
208			  }
209			}
210		} else {
211			/* Device does not support poll, busy wait */
212			int retries = 0;
213			while (1) {
214				unsigned char ch;
215
216				retries++;
217				if (retries >= timeout) {
218					break;
219				}
220
221				f->f_pos = 0;
222				if (f->f_op->read(f, &ch, 1, &f->f_pos) == 1) {
223					result = ch;
224					break;
225				}
226				udelay(100);
227			}
228		}
229		set_fs(oldfs);
230	}
231	return result;
232}
233
234static void tty_setspeed(struct file *f, int speed)
235{
236	mm_segment_t oldfs;
237
238	oldfs = get_fs();
239	set_fs(KERNEL_DS);
240	{
241		/*  Set speed */
242		struct termios settings;
243
244		tty_ioctl(f, TCGETS, (unsigned long)&settings);
245/* printk("Speed: %d\n", settings.c_cflag & (CBAUD | CBAUDEX)); */
246		settings.c_iflag = 0;
247		settings.c_oflag = 0;
248		settings.c_lflag = 0;
249		settings.c_cflag = CLOCAL | CS8 | CREAD;
250		settings.c_cc[VMIN] = 0;
251		settings.c_cc[VTIME] = 0;
252		switch (speed) {
253		case 2400:{
254				settings.c_cflag |= B2400;
255			}
256			break;
257		case 4800:{
258				settings.c_cflag |= B4800;
259			}
260			break;
261		case 9600:{
262				settings.c_cflag |= B9600;
263			}
264			break;
265		case 19200:{
266				settings.c_cflag |= B19200;
267			}
268			break;
269		case 38400:{
270				settings.c_cflag |= B38400;
271			}
272			break;
273		case 57600:{
274				settings.c_cflag |= B57600;
275			}
276			break;
277		case 115200:{
278				settings.c_cflag |= B115200;
279			}
280			break;
281		default:{
282				settings.c_cflag |= B9600;
283			}
284			break;
285		}
286		tty_ioctl(f, TCSETS, (unsigned long)&settings);
287/* printk("Speed: %d\n", settings.c_cflag & (CBAUD | CBAUDEX)); */
288	}
289	{
290		/*  Set low latency */
291		struct serial_struct settings;
292
293		tty_ioctl(f, TIOCGSERIAL, (unsigned long)&settings);
294		settings.flags |= ASYNC_LOW_LATENCY;
295		tty_ioctl(f, TIOCSSERIAL, (unsigned long)&settings);
296	}
297
298	set_fs(oldfs);
299}
300
301static void poll_digital(struct file *f, int channel)
302{
303	char cmd;
304
305	cmd = 0x40 | (channel & 0x1f);
306	tty_write(f, &cmd, 1);
307}
308
309static void poll_channel(struct file *f, int channel)
310{
311	char cmd;
312
313	cmd = 0x60 | (channel & 0x1f);
314	tty_write(f, &cmd, 1);
315}
316
317static struct serial_data serial_read(struct file *f, int timeout)
318{
319	struct serial_data result;
320	int length;
321
322	result.kind = is_invalid;
323	result.index = 0;
324	result.value = 0;
325	length = 0;
326	while (1) {
327		int data = tty_read(f, timeout);
328
329		length++;
330		if (data < 0) {
331			printk("serial2002 error\n");
332			break;
333		} else if (data & 0x80) {
334			result.value = (result.value << 7) | (data & 0x7f);
335		} else {
336			if (length == 1) {
337				switch ((data >> 5) & 0x03) {
338				case 0:{
339						result.value = 0;
340						result.kind = is_digital;
341					}
342					break;
343				case 1:{
344						result.value = 1;
345						result.kind = is_digital;
346					}
347					break;
348				}
349			} else {
350				result.value =
351					(result.
352					value << 2) | ((data & 0x60) >> 5);
353				result.kind = is_channel;
354			}
355			result.index = data & 0x1f;
356			break;
357		}
358	}
359	return result;
360
361}
362
363static void serial_write(struct file *f, struct serial_data data)
364{
365	if (data.kind == is_digital) {
366		unsigned char ch =
367			((data.value << 5) & 0x20) | (data.index & 0x1f);
368		tty_write(f, &ch, 1);
369	} else {
370		unsigned char ch[6];
371		int i = 0;
372		if (data.value >= (1L << 30)) {
373			ch[i] = 0x80 | ((data.value >> 30) & 0x03);
374			i++;
375		}
376		if (data.value >= (1L << 23)) {
377			ch[i] = 0x80 | ((data.value >> 23) & 0x7f);
378			i++;
379		}
380		if (data.value >= (1L << 16)) {
381			ch[i] = 0x80 | ((data.value >> 16) & 0x7f);
382			i++;
383		}
384		if (data.value >= (1L << 9)) {
385			ch[i] = 0x80 | ((data.value >> 9) & 0x7f);
386			i++;
387		}
388		ch[i] = 0x80 | ((data.value >> 2) & 0x7f);
389		i++;
390		ch[i] = ((data.value << 5) & 0x60) | (data.index & 0x1f);
391		i++;
392		tty_write(f, ch, i);
393	}
394}
395
396static void serial_2002_open(struct comedi_device *dev)
397{
398	char port[20];
399
400	sprintf(port, "/dev/ttyS%d", devpriv->port);
401	devpriv->tty = filp_open(port, 0, O_RDWR);
402	if (IS_ERR(devpriv->tty)) {
403		printk("serial_2002: file open error = %ld\n",
404			PTR_ERR(devpriv->tty));
405	} else {
406		struct config_t {
407
408			int kind;
409			int bits;
410			int min;
411			int max;
412		};
413
414		struct config_t dig_in_config[32];
415		struct config_t dig_out_config[32];
416		struct config_t chan_in_config[32];
417		struct config_t chan_out_config[32];
418		int i;
419
420		for (i = 0; i < 32; i++) {
421			dig_in_config[i].kind = 0;
422			dig_in_config[i].bits = 0;
423			dig_in_config[i].min = 0;
424			dig_in_config[i].max = 0;
425			dig_out_config[i].kind = 0;
426			dig_out_config[i].bits = 0;
427			dig_out_config[i].min = 0;
428			dig_out_config[i].max = 0;
429			chan_in_config[i].kind = 0;
430			chan_in_config[i].bits = 0;
431			chan_in_config[i].min = 0;
432			chan_in_config[i].max = 0;
433			chan_out_config[i].kind = 0;
434			chan_out_config[i].bits = 0;
435			chan_out_config[i].min = 0;
436			chan_out_config[i].max = 0;
437		}
438
439		tty_setspeed(devpriv->tty, devpriv->speed);
440		poll_channel(devpriv->tty, 31);	/*  Start reading configuration */
441		while (1) {
442			struct serial_data data;
443
444			data = serial_read(devpriv->tty, 1000);
445			if (data.kind != is_channel || data.index != 31
446				|| !(data.value & 0xe0)) {
447				break;
448			} else {
449				int command, channel, kind;
450				struct config_t *cur_config = 0;
451
452				channel = data.value & 0x1f;
453				kind = (data.value >> 5) & 0x7;
454				command = (data.value >> 8) & 0x3;
455				switch (kind) {
456				case 1:{
457						cur_config = dig_in_config;
458					}
459					break;
460				case 2:{
461						cur_config = dig_out_config;
462					}
463					break;
464				case 3:{
465						cur_config = chan_in_config;
466					}
467					break;
468				case 4:{
469						cur_config = chan_out_config;
470					}
471					break;
472				case 5:{
473						cur_config = chan_in_config;
474					}
475					break;
476				}
477
478				if (cur_config) {
479					cur_config[channel].kind = kind;
480					switch (command) {
481					case 0:{
482							cur_config[channel].
483								bits =
484								(data.
485								value >> 10) &
486								0x3f;
487						}
488						break;
489					case 1:{
490							int unit, sign, min;
491							unit = (data.
492								value >> 10) &
493								0x7;
494							sign = (data.
495								value >> 13) &
496								0x1;
497							min = (data.
498								value >> 14) &
499								0xfffff;
500
501							switch (unit) {
502							case 0:{
503									min = min * 1000000;
504								}
505								break;
506							case 1:{
507									min = min * 1000;
508								}
509								break;
510							case 2:{
511									min = min * 1;
512								}
513								break;
514							}
515							if (sign) {
516								min = -min;
517							}
518							cur_config[channel].
519								min = min;
520						}
521						break;
522					case 2:{
523							int unit, sign, max;
524							unit = (data.
525								value >> 10) &
526								0x7;
527							sign = (data.
528								value >> 13) &
529								0x1;
530							max = (data.
531								value >> 14) &
532								0xfffff;
533
534							switch (unit) {
535							case 0:{
536									max = max * 1000000;
537								}
538								break;
539							case 1:{
540									max = max * 1000;
541								}
542								break;
543							case 2:{
544									max = max * 1;
545								}
546								break;
547							}
548							if (sign) {
549								max = -max;
550							}
551							cur_config[channel].
552								max = max;
553						}
554						break;
555					}
556				}
557			}
558		}
559		for (i = 0; i <= 4; i++) {
560			/*  Fill in subdev data */
561			struct config_t *c;
562			unsigned char *mapping = 0;
563			struct serial2002_range_table_t *range = 0;
564			int kind = 0;
565
566			switch (i) {
567			case 0:{
568					c = dig_in_config;
569					mapping = devpriv->digital_in_mapping;
570					kind = 1;
571				}
572				break;
573			case 1:{
574					c = dig_out_config;
575					mapping = devpriv->digital_out_mapping;
576					kind = 2;
577				}
578				break;
579			case 2:{
580					c = chan_in_config;
581					mapping = devpriv->analog_in_mapping;
582					range = devpriv->in_range;
583					kind = 3;
584				}
585				break;
586			case 3:{
587					c = chan_out_config;
588					mapping = devpriv->analog_out_mapping;
589					range = devpriv->out_range;
590					kind = 4;
591				}
592				break;
593			case 4:{
594					c = chan_in_config;
595					mapping = devpriv->encoder_in_mapping;
596					range = devpriv->in_range;
597					kind = 5;
598				}
599				break;
600			default:{
601					c = 0;
602				}
603				break;
604			}
605			if (c) {
606				struct comedi_subdevice *s;
607				const struct comedi_lrange **range_table_list = NULL;
608				unsigned int *maxdata_list;
609				int j, chan;
610
611				for (chan = 0, j = 0; j < 32; j++) {
612					if (c[j].kind == kind) {
613						chan++;
614					}
615				}
616				s = &dev->subdevices[i];
617				s->n_chan = chan;
618				s->maxdata = 0;
619				if (s->maxdata_list) {
620					kfree(s->maxdata_list);
621				}
622				s->maxdata_list = maxdata_list =
623					kmalloc(sizeof(unsigned int) * s->n_chan,
624					GFP_KERNEL);
625				if (s->range_table_list) {
626					kfree(s->range_table_list);
627				}
628				if (range) {
629					s->range_table = 0;
630					s->range_table_list = range_table_list =
631						kmalloc(sizeof
632						(struct serial2002_range_table_t) *
633						s->n_chan, GFP_KERNEL);
634				}
635				for (chan = 0, j = 0; j < 32; j++) {
636					if (c[j].kind == kind) {
637						if (mapping) {
638							mapping[chan] = j;
639						}
640						if (range) {
641							range[j].length = 1;
642							range[j].range.min =
643								c[j].min;
644							range[j].range.max =
645								c[j].max;
646							range_table_list[chan] =
647								(const struct
648								comedi_lrange *)
649								&range[j];
650						}
651						maxdata_list[chan] =
652							((long long)1 << c[j].
653							bits) - 1;
654						chan++;
655					}
656				}
657			}
658		}
659	}
660}
661
662static void serial_2002_close(struct comedi_device *dev)
663{
664	if (!IS_ERR(devpriv->tty) && (devpriv->tty != 0)) {
665		filp_close(devpriv->tty, 0);
666	}
667}
668
669static int serial2002_di_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
670	struct comedi_insn *insn, unsigned int *data)
671{
672	int n;
673	int chan;
674
675	chan = devpriv->digital_in_mapping[CR_CHAN(insn->chanspec)];
676	for (n = 0; n < insn->n; n++) {
677		struct serial_data read;
678
679		poll_digital(devpriv->tty, chan);
680		while (1) {
681			read = serial_read(devpriv->tty, 1000);
682			if (read.kind != is_digital || read.index == chan) {
683				break;
684			}
685		}
686		data[n] = read.value;
687	}
688	return n;
689}
690
691static int serial2002_do_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
692	struct comedi_insn *insn, unsigned int *data)
693{
694	int n;
695	int chan;
696
697	chan = devpriv->digital_out_mapping[CR_CHAN(insn->chanspec)];
698	for (n = 0; n < insn->n; n++) {
699		struct serial_data write;
700
701		write.kind = is_digital;
702		write.index = chan;
703		write.value = data[n];
704		serial_write(devpriv->tty, write);
705	}
706	return n;
707}
708
709static int serial2002_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
710	struct comedi_insn *insn, unsigned int *data)
711{
712	int n;
713	int chan;
714
715	chan = devpriv->analog_in_mapping[CR_CHAN(insn->chanspec)];
716	for (n = 0; n < insn->n; n++) {
717		struct serial_data read;
718
719		poll_channel(devpriv->tty, chan);
720		while (1) {
721			read = serial_read(devpriv->tty, 1000);
722			if (read.kind != is_channel || read.index == chan) {
723				break;
724			}
725		}
726		data[n] = read.value;
727	}
728	return n;
729}
730
731static int serial2002_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
732	struct comedi_insn *insn, unsigned int *data)
733{
734	int n;
735	int chan;
736
737	chan = devpriv->analog_out_mapping[CR_CHAN(insn->chanspec)];
738	for (n = 0; n < insn->n; n++) {
739		struct serial_data write;
740
741		write.kind = is_channel;
742		write.index = chan;
743		write.value = data[n];
744		serial_write(devpriv->tty, write);
745		devpriv->ao_readback[chan] = data[n];
746	}
747	return n;
748}
749
750static int serial2002_ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
751	struct comedi_insn *insn, unsigned int *data)
752{
753	int n;
754	int chan = CR_CHAN(insn->chanspec);
755
756	for (n = 0; n < insn->n; n++) {
757		data[n] = devpriv->ao_readback[chan];
758	}
759
760	return n;
761}
762
763static int serial2002_ei_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
764	struct comedi_insn *insn, unsigned int *data)
765{
766	int n;
767	int chan;
768
769	chan = devpriv->encoder_in_mapping[CR_CHAN(insn->chanspec)];
770	for (n = 0; n < insn->n; n++) {
771		struct serial_data read;
772
773		poll_channel(devpriv->tty, chan);
774		while (1) {
775			read = serial_read(devpriv->tty, 1000);
776			if (read.kind != is_channel || read.index == chan) {
777				break;
778			}
779		}
780		data[n] = read.value;
781	}
782	return n;
783}
784
785static int serial2002_attach(struct comedi_device *dev, struct comedi_devconfig *it)
786{
787	struct comedi_subdevice *s;
788
789	printk("comedi%d: serial2002: ", dev->minor);
790	dev->board_name = thisboard->name;
791	if (alloc_private(dev, sizeof(struct serial2002_private)) < 0) {
792		return -ENOMEM;
793	}
794	dev->open = serial_2002_open;
795	dev->close = serial_2002_close;
796	devpriv->port = it->options[0];
797	devpriv->speed = it->options[1];
798	printk("/dev/ttyS%d @ %d\n", devpriv->port, devpriv->speed);
799
800	if (alloc_subdevices(dev, 5) < 0)
801		return -ENOMEM;
802
803	/* digital input subdevice */
804	s = dev->subdevices + 0;
805	s->type = COMEDI_SUBD_DI;
806	s->subdev_flags = SDF_READABLE;
807	s->n_chan = 0;
808	s->maxdata = 1;
809	s->range_table = &range_digital;
810	s->insn_read = &serial2002_di_rinsn;
811
812	/* digital output subdevice */
813	s = dev->subdevices + 1;
814	s->type = COMEDI_SUBD_DO;
815	s->subdev_flags = SDF_WRITEABLE;
816	s->n_chan = 0;
817	s->maxdata = 1;
818	s->range_table = &range_digital;
819	s->insn_write = &serial2002_do_winsn;
820
821	/* analog input subdevice */
822	s = dev->subdevices + 2;
823	s->type = COMEDI_SUBD_AI;
824	s->subdev_flags = SDF_READABLE | SDF_GROUND;
825	s->n_chan = 0;
826	s->maxdata = 1;
827	s->range_table = 0;
828	s->insn_read = &serial2002_ai_rinsn;
829
830	/* analog output subdevice */
831	s = dev->subdevices + 3;
832	s->type = COMEDI_SUBD_AO;
833	s->subdev_flags = SDF_WRITEABLE;
834	s->n_chan = 0;
835	s->maxdata = 1;
836	s->range_table = 0;
837	s->insn_write = &serial2002_ao_winsn;
838	s->insn_read = &serial2002_ao_rinsn;
839
840	/* encoder input subdevice */
841	s = dev->subdevices + 4;
842	s->type = COMEDI_SUBD_COUNTER;
843	s->subdev_flags = SDF_READABLE | SDF_LSAMPL;
844	s->n_chan = 0;
845	s->maxdata = 1;
846	s->range_table = 0;
847	s->insn_read = &serial2002_ei_rinsn;
848
849	return 1;
850}
851
852static int serial2002_detach(struct comedi_device *dev)
853{
854	struct comedi_subdevice *s;
855	int i;
856
857	printk("comedi%d: serial2002: remove\n", dev->minor);
858	for (i = 0; i < 4; i++) {
859		s = &dev->subdevices[i];
860		if (s->maxdata_list) {
861			kfree(s->maxdata_list);
862		}
863		if (s->range_table_list) {
864			kfree(s->range_table_list);
865		}
866	}
867	return 0;
868}
869
870COMEDI_INITCLEANUP(driver_serial2002);
871