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110526ed KD |
1 | /*************************************************************************** |
2 | * * | |
3 | * comedi/drivers/unioxx5.c * | |
4 | * Driver for Fastwel UNIOxx-5 (analog and digital i/o) boards. * | |
5 | * * | |
6 | * Copyright (C) 2006 Kruchinin Daniil (asgard) [asgard@etersoft.ru] * | |
7 | * * | |
8 | * COMEDI - Linux Control and Measurement Device Interface * | |
9 | * Copyright (C) 1998,2000 David A. Schleef <ds@schleef.org> * | |
10 | * * | |
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. * | |
15 | * * | |
16 | * This program is distributed in the hope that it will be useful, * | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | |
19 | * GNU General Public License for more details. * | |
20 | * * | |
21 | * You should have received a copy of the GNU General Public License * | |
22 | * along with this program; if not, write to the Free Software * | |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * | |
24 | * * | |
25 | ***************************************************************************/ | |
26 | /* | |
27 | ||
28 | Driver: unioxx5 | |
29 | Description: Driver for Fastwel UNIOxx-5 (analog and digital i/o) boards. | |
30 | Author: Kruchinin Daniil (asgard) <asgard@etersoft.ru> | |
31 | Status: unknown | |
32 | Updated: 2006-10-09 | |
33 | Devices: [Fastwel] UNIOxx-5 (unioxx5), | |
34 | ||
35 | This card supports digital and analog I/O. It written for g01 | |
36 | subdevices only. | |
37 | channels range: 0 .. 23 dio channels | |
38 | and 0 .. 11 analog modules range | |
39 | During attaching unioxx5 module displays modules identifiers | |
40 | (see dmesg after comedi_config) in format: | |
41 | | [module_number] module_id | | |
42 | ||
43 | */ | |
44 | ||
45 | #include "../comedidev.h" | |
46 | #include <linux/ioport.h> | |
5a0e3ad6 | 47 | #include <linux/slab.h> |
110526ed KD |
48 | |
49 | #define DRIVER_NAME "unioxx5" | |
50 | #define UNIOXX5_SIZE 0x10 | |
51 | #define UNIOXX5_SUBDEV_BASE 0xA000 /* base addr of first subdev */ | |
52 | #define UNIOXX5_SUBDEV_ODDS 0x400 | |
53 | ||
54 | /* modules types */ | |
55 | #define MODULE_DIGITAL 0 | |
56 | #define MODULE_OUTPUT_MASK 0x80 /* analog input/output */ | |
57 | ||
58 | /* constants for digital i/o */ | |
59 | #define UNIOXX5_NUM_OF_CHANS 24 | |
60 | ||
61 | /* constants for analog i/o */ | |
62 | #define TxBE 0x10 /* transmit buffer enable */ | |
63 | #define RxCA 0x20 /* 1 receive character available */ | |
64 | #define Rx2CA 0x40 /* 2 receive character available */ | |
65 | #define Rx4CA 0x80 /* 4 receive character available */ | |
66 | ||
67 | /* bytes mask errors */ | |
68 | #define Rx2CA_ERR_MASK 0x04 /* 2 bytes receiving error */ | |
69 | #define Rx4CA_ERR_MASK 0x08 /* 4 bytes receiving error */ | |
70 | ||
71 | /* channel modes */ | |
72 | #define ALL_2_INPUT 0 /* config all digital channels to input */ | |
73 | #define ALL_2_OUTPUT 1 /* config all digital channels to output */ | |
74 | ||
75 | /* 'private' structure for each subdevice */ | |
33a4640f | 76 | struct unioxx5_subd_priv { |
110526ed | 77 | int usp_iobase; |
33e73e00 R |
78 | /* 12 modules. each can be 70L or 73L */ |
79 | unsigned char usp_module_type[12]; | |
80 | /* for saving previous written value for analog modules */ | |
81 | unsigned char usp_extra_data[12][4]; | |
110526ed KD |
82 | unsigned char usp_prev_wr_val[3]; /* previous written value */ |
83 | unsigned char usp_prev_cn_val[3]; /* previous channel value */ | |
33a4640f | 84 | }; |
110526ed | 85 | |
0a85b6f0 MT |
86 | static int unioxx5_attach(struct comedi_device *dev, |
87 | struct comedi_devconfig *it); | |
88 | static int unioxx5_subdev_write(struct comedi_device *dev, | |
89 | struct comedi_subdevice *subdev, | |
90 | struct comedi_insn *insn, unsigned int *data); | |
91 | static int unioxx5_subdev_read(struct comedi_device *dev, | |
92 | struct comedi_subdevice *subdev, | |
93 | struct comedi_insn *insn, unsigned int *data); | |
94 | static int unioxx5_insn_config(struct comedi_device *dev, | |
95 | struct comedi_subdevice *subdev, | |
96 | struct comedi_insn *insn, unsigned int *data); | |
da91b269 | 97 | static int unioxx5_detach(struct comedi_device *dev); |
0a85b6f0 MT |
98 | static int __unioxx5_subdev_init(struct comedi_subdevice *subdev, |
99 | int subdev_iobase, int minor); | |
100 | static int __unioxx5_digital_write(struct unioxx5_subd_priv *usp, | |
101 | unsigned int *data, int channel, int minor); | |
102 | static int __unioxx5_digital_read(struct unioxx5_subd_priv *usp, | |
103 | unsigned int *data, int channel, int minor); | |
2696fb57 | 104 | /* static void __unioxx5_digital_config(struct unioxx5_subd_priv* usp, int mode); */ |
0a85b6f0 MT |
105 | static int __unioxx5_analog_write(struct unioxx5_subd_priv *usp, |
106 | unsigned int *data, int channel, int minor); | |
107 | static int __unioxx5_analog_read(struct unioxx5_subd_priv *usp, | |
108 | unsigned int *data, int channel, int minor); | |
110526ed | 109 | static int __unioxx5_define_chan_offset(int chan_num); |
da91b269 | 110 | static void __unioxx5_analog_config(struct unioxx5_subd_priv *usp, int channel); |
110526ed | 111 | |
139dfbdf | 112 | static struct comedi_driver unioxx5_driver = { |
68c3dbff BP |
113 | .driver_name = DRIVER_NAME, |
114 | .module = THIS_MODULE, | |
115 | .attach = unioxx5_attach, | |
116 | .detach = unioxx5_detach | |
110526ed KD |
117 | }; |
118 | ||
7114a280 AT |
119 | static int __init unioxx5_driver_init_module(void) |
120 | { | |
121 | return comedi_driver_register(&unioxx5_driver); | |
122 | } | |
123 | ||
124 | static void __exit unioxx5_driver_cleanup_module(void) | |
125 | { | |
126 | comedi_driver_unregister(&unioxx5_driver); | |
127 | } | |
128 | ||
129 | module_init(unioxx5_driver_init_module); | |
130 | module_exit(unioxx5_driver_cleanup_module); | |
110526ed | 131 | |
0a85b6f0 MT |
132 | static int unioxx5_attach(struct comedi_device *dev, |
133 | struct comedi_devconfig *it) | |
110526ed KD |
134 | { |
135 | int iobase, i, n_subd; | |
136 | int id, num, ba; | |
137 | ||
138 | iobase = it->options[0]; | |
139 | ||
140 | dev->board_name = DRIVER_NAME; | |
141 | dev->iobase = iobase; | |
142 | iobase += UNIOXX5_SUBDEV_BASE; | |
143 | ||
144 | /* defining number of subdevices and getting they types (it must be 'g01') */ | |
145 | for (i = n_subd = 0, ba = iobase; i < 4; i++, ba += UNIOXX5_SUBDEV_ODDS) { | |
146 | id = inb(ba + 0xE); | |
147 | num = inb(ba + 0xF); | |
148 | ||
149 | if (id != 'g' || num != 1) | |
150 | continue; | |
151 | ||
152 | n_subd++; | |
153 | } | |
154 | ||
155 | /* unioxx5 can has from two to four subdevices */ | |
156 | if (n_subd < 2) { | |
157 | printk(KERN_ERR | |
0a85b6f0 | 158 | "your card must has at least 2 'g01' subdevices\n"); |
110526ed KD |
159 | return -1; |
160 | } | |
161 | ||
162 | if (alloc_subdevices(dev, n_subd) < 0) { | |
163 | printk(KERN_ERR "out of memory\n"); | |
164 | return -ENOMEM; | |
165 | } | |
166 | ||
167 | /* initializing each of for same subdevices */ | |
168 | for (i = 0; i < n_subd; i++, iobase += UNIOXX5_SUBDEV_ODDS) { | |
169 | if (__unioxx5_subdev_init(&dev->subdevices[i], iobase, | |
0a85b6f0 | 170 | dev->minor) < 0) |
110526ed KD |
171 | return -1; |
172 | } | |
173 | ||
33e73e00 | 174 | printk(KERN_INFO "attached\n"); |
110526ed KD |
175 | return 0; |
176 | } | |
177 | ||
0a85b6f0 MT |
178 | static int unioxx5_subdev_read(struct comedi_device *dev, |
179 | struct comedi_subdevice *subdev, | |
180 | struct comedi_insn *insn, unsigned int *data) | |
110526ed | 181 | { |
33a4640f | 182 | struct unioxx5_subd_priv *usp = subdev->private; |
110526ed KD |
183 | int channel, type; |
184 | ||
185 | channel = CR_CHAN(insn->chanspec); | |
33e73e00 R |
186 | /* defining module type(analog or digital) */ |
187 | type = usp->usp_module_type[channel / 2]; | |
110526ed KD |
188 | |
189 | if (type == MODULE_DIGITAL) { | |
190 | if (!__unioxx5_digital_read(usp, data, channel, dev->minor)) | |
191 | return -1; | |
192 | } else { | |
193 | if (!__unioxx5_analog_read(usp, data, channel, dev->minor)) | |
194 | return -1; | |
195 | } | |
196 | ||
197 | return 1; | |
198 | } | |
199 | ||
0a85b6f0 MT |
200 | static int unioxx5_subdev_write(struct comedi_device *dev, |
201 | struct comedi_subdevice *subdev, | |
202 | struct comedi_insn *insn, unsigned int *data) | |
110526ed | 203 | { |
33a4640f | 204 | struct unioxx5_subd_priv *usp = subdev->private; |
110526ed KD |
205 | int channel, type; |
206 | ||
207 | channel = CR_CHAN(insn->chanspec); | |
33e73e00 R |
208 | /* defining module type(analog or digital) */ |
209 | type = usp->usp_module_type[channel / 2]; | |
110526ed KD |
210 | |
211 | if (type == MODULE_DIGITAL) { | |
212 | if (!__unioxx5_digital_write(usp, data, channel, dev->minor)) | |
213 | return -1; | |
214 | } else { | |
215 | if (!__unioxx5_analog_write(usp, data, channel, dev->minor)) | |
216 | return -1; | |
217 | } | |
218 | ||
219 | return 1; | |
220 | } | |
221 | ||
222 | /* for digital modules only */ | |
0a85b6f0 MT |
223 | static int unioxx5_insn_config(struct comedi_device *dev, |
224 | struct comedi_subdevice *subdev, | |
225 | struct comedi_insn *insn, unsigned int *data) | |
110526ed KD |
226 | { |
227 | int channel_offset, flags, channel = CR_CHAN(insn->chanspec), type; | |
33a4640f | 228 | struct unioxx5_subd_priv *usp = subdev->private; |
110526ed KD |
229 | int mask = 1 << (channel & 0x07); |
230 | ||
231 | type = usp->usp_module_type[channel / 2]; | |
232 | ||
233 | if (type != MODULE_DIGITAL) { | |
234 | printk(KERN_ERR | |
0a85b6f0 MT |
235 | "comedi%d: channel configuration accessible only for digital modules\n", |
236 | dev->minor); | |
110526ed KD |
237 | return -1; |
238 | } | |
239 | ||
c3744138 BP |
240 | channel_offset = __unioxx5_define_chan_offset(channel); |
241 | if (channel_offset < 0) { | |
110526ed | 242 | printk(KERN_ERR |
0a85b6f0 MT |
243 | "comedi%d: undefined channel %d. channel range is 0 .. 23\n", |
244 | dev->minor, channel); | |
110526ed KD |
245 | return -1; |
246 | } | |
247 | ||
248 | /* gets previously written value */ | |
249 | flags = usp->usp_prev_cn_val[channel_offset - 1]; | |
250 | ||
251 | switch (*data) { | |
252 | case COMEDI_INPUT: | |
253 | flags &= ~mask; | |
254 | break; | |
255 | case COMEDI_OUTPUT: | |
256 | flags |= mask; | |
257 | break; | |
258 | default: | |
259 | printk(KERN_ERR "comedi%d: unknown flag\n", dev->minor); | |
260 | return -1; | |
261 | } | |
262 | ||
263 | /* *\ | |
264 | * sets channels buffer to 1(after this we are allowed to * | |
265 | * change channel type on input or output) * | |
266 | \* */ | |
267 | outb(1, usp->usp_iobase + 0); | |
33e73e00 R |
268 | /* changes type of _one_ channel */ |
269 | outb(flags, usp->usp_iobase + channel_offset); | |
270 | /* sets channels bank to 0(allows directly input/output) */ | |
271 | outb(0, usp->usp_iobase + 0); | |
272 | /* saves written value */ | |
273 | usp->usp_prev_cn_val[channel_offset - 1] = flags; | |
110526ed KD |
274 | |
275 | return 0; | |
276 | } | |
277 | ||
da91b269 | 278 | static int unioxx5_detach(struct comedi_device *dev) |
110526ed KD |
279 | { |
280 | int i; | |
34c43922 | 281 | struct comedi_subdevice *subdev; |
33a4640f | 282 | struct unioxx5_subd_priv *usp; |
110526ed KD |
283 | |
284 | for (i = 0; i < dev->n_subdevices; i++) { | |
285 | subdev = &dev->subdevices[i]; | |
286 | usp = subdev->private; | |
287 | release_region(usp->usp_iobase, UNIOXX5_SIZE); | |
288 | kfree(subdev->private); | |
289 | } | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
294 | /* initializing subdevice with given address */ | |
0a85b6f0 MT |
295 | static int __unioxx5_subdev_init(struct comedi_subdevice *subdev, |
296 | int subdev_iobase, int minor) | |
110526ed | 297 | { |
33a4640f | 298 | struct unioxx5_subd_priv *usp; |
110526ed KD |
299 | int i, to, ndef_flag = 0; |
300 | ||
301 | if (!request_region(subdev_iobase, UNIOXX5_SIZE, DRIVER_NAME)) { | |
302 | printk(KERN_ERR "comedi%d: I/O port conflict\n", minor); | |
303 | return -EIO; | |
304 | } | |
305 | ||
32414878 | 306 | usp = kzalloc(sizeof(*usp), GFP_KERNEL); |
c3744138 BP |
307 | |
308 | if (usp == NULL) { | |
81a14956 | 309 | printk(KERN_ERR "comedi%d: error! --> out of memory!\n", minor); |
110526ed KD |
310 | return -1; |
311 | } | |
312 | ||
313 | usp->usp_iobase = subdev_iobase; | |
33e73e00 | 314 | printk(KERN_INFO "comedi%d: |", minor); |
110526ed KD |
315 | |
316 | /* defining modules types */ | |
317 | for (i = 0; i < 12; i++) { | |
318 | to = 10000; | |
319 | ||
320 | __unioxx5_analog_config(usp, i * 2); | |
33e73e00 R |
321 | /* sends channel number to card */ |
322 | outb(i + 1, subdev_iobase + 5); | |
110526ed | 323 | outb('H', subdev_iobase + 6); /* requests EEPROM world */ |
6fd071cc JS |
324 | while (!(inb(subdev_iobase + 0) & TxBE)) |
325 | ; /* waits while writting will be allowed */ | |
110526ed KD |
326 | outb(0, subdev_iobase + 6); |
327 | ||
328 | /* waits while reading of two bytes will be allowed */ | |
329 | while (!(inb(subdev_iobase + 0) & Rx2CA)) { | |
330 | if (--to <= 0) { | |
331 | ndef_flag = 1; | |
332 | break; | |
333 | } | |
334 | } | |
335 | ||
336 | if (ndef_flag) { | |
337 | usp->usp_module_type[i] = 0; | |
338 | ndef_flag = 0; | |
339 | } else | |
340 | usp->usp_module_type[i] = inb(subdev_iobase + 6); | |
341 | ||
342 | printk(" [%d] 0x%02x |", i, usp->usp_module_type[i]); | |
5f74ea14 | 343 | udelay(1); |
110526ed KD |
344 | } |
345 | ||
346 | printk("\n"); | |
347 | ||
348 | /* initial subdevice for digital or analog i/o */ | |
349 | subdev->type = COMEDI_SUBD_DIO; | |
350 | subdev->private = usp; | |
351 | subdev->subdev_flags = SDF_READABLE | SDF_WRITABLE; | |
352 | subdev->n_chan = UNIOXX5_NUM_OF_CHANS; | |
353 | subdev->maxdata = 0xFFF; | |
354 | subdev->range_table = &range_digital; | |
355 | subdev->insn_read = unioxx5_subdev_read; | |
356 | subdev->insn_write = unioxx5_subdev_write; | |
33e73e00 R |
357 | /* for digital modules only!!! */ |
358 | subdev->insn_config = unioxx5_insn_config; | |
110526ed | 359 | |
33e73e00 | 360 | printk(KERN_INFO "subdevice configured\n"); |
110526ed KD |
361 | |
362 | return 0; | |
363 | } | |
364 | ||
0a85b6f0 MT |
365 | static int __unioxx5_digital_write(struct unioxx5_subd_priv *usp, |
366 | unsigned int *data, int channel, int minor) | |
110526ed KD |
367 | { |
368 | int channel_offset, val; | |
369 | int mask = 1 << (channel & 0x07); | |
370 | ||
c3744138 BP |
371 | channel_offset = __unioxx5_define_chan_offset(channel); |
372 | if (channel_offset < 0) { | |
110526ed | 373 | printk(KERN_ERR |
0a85b6f0 MT |
374 | "comedi%d: undefined channel %d. channel range is 0 .. 23\n", |
375 | minor, channel); | |
110526ed KD |
376 | return 0; |
377 | } | |
378 | ||
33e73e00 R |
379 | /* getting previous written value */ |
380 | val = usp->usp_prev_wr_val[channel_offset - 1]; | |
110526ed KD |
381 | |
382 | if (*data) | |
383 | val |= mask; | |
384 | else | |
385 | val &= ~mask; | |
386 | ||
387 | outb(val, usp->usp_iobase + channel_offset); | |
33e73e00 R |
388 | /* saving new written value */ |
389 | usp->usp_prev_wr_val[channel_offset - 1] = val; | |
110526ed KD |
390 | |
391 | return 1; | |
392 | } | |
393 | ||
394 | /* function for digital reading */ | |
0a85b6f0 MT |
395 | static int __unioxx5_digital_read(struct unioxx5_subd_priv *usp, |
396 | unsigned int *data, int channel, int minor) | |
110526ed KD |
397 | { |
398 | int channel_offset, mask = 1 << (channel & 0x07); | |
399 | ||
c3744138 BP |
400 | channel_offset = __unioxx5_define_chan_offset(channel); |
401 | if (channel_offset < 0) { | |
110526ed | 402 | printk(KERN_ERR |
0a85b6f0 MT |
403 | "comedi%d: undefined channel %d. channel range is 0 .. 23\n", |
404 | minor, channel); | |
110526ed KD |
405 | return 0; |
406 | } | |
407 | ||
408 | *data = inb(usp->usp_iobase + channel_offset); | |
409 | *data &= mask; | |
410 | ||
411 | if (channel_offset > 1) | |
412 | channel -= 2 << channel_offset; /* this operation is created for correct readed value to 0 or 1 */ | |
110526ed KD |
413 | *data >>= channel; |
414 | return 1; | |
415 | } | |
416 | ||
417 | #if 0 /* not used? */ | |
da91b269 | 418 | static void __unioxx5_digital_config(struct unioxx5_subd_priv *usp, int mode) |
110526ed KD |
419 | { |
420 | int i, mask; | |
421 | ||
422 | mask = (mode == ALL_2_OUTPUT) ? 0xFF : 0x00; | |
423 | printk("COMEDI: mode = %d\n", mask); | |
424 | ||
425 | outb(1, usp->usp_iobase + 0); | |
426 | ||
427 | for (i = 0; i < 3; i++) | |
428 | outb(mask, usp->usp_iobase + i); | |
429 | ||
430 | outb(0, usp->usp_iobase + 0); | |
431 | } | |
432 | #endif | |
433 | ||
0a85b6f0 MT |
434 | static int __unioxx5_analog_write(struct unioxx5_subd_priv *usp, |
435 | unsigned int *data, int channel, int minor) | |
110526ed KD |
436 | { |
437 | int module, i; | |
438 | ||
439 | module = channel / 2; /* definig module number(0 .. 11) */ | |
440 | i = (channel % 2) << 1; /* depends on type of channel (A or B) */ | |
441 | ||
442 | /* defining if given module can work on output */ | |
443 | if (!(usp->usp_module_type[module] & MODULE_OUTPUT_MASK)) { | |
444 | printk(KERN_ERR | |
0a85b6f0 MT |
445 | "comedi%d: module in position %d with id 0x%0x is for input only!\n", |
446 | minor, module, usp->usp_module_type[module]); | |
110526ed KD |
447 | return 0; |
448 | } | |
449 | ||
450 | __unioxx5_analog_config(usp, channel); | |
451 | /* saving minor byte */ | |
452 | usp->usp_extra_data[module][i++] = (unsigned char)(*data & 0x00FF); | |
453 | /* saving major byte */ | |
454 | usp->usp_extra_data[module][i] = (unsigned char)((*data & 0xFF00) >> 8); | |
455 | ||
2696fb57 | 456 | /* while(!((inb(usp->usp_iobase + 0)) & TxBE)); */ |
33e73e00 R |
457 | /* sending module number to card(1 .. 12) */ |
458 | outb(module + 1, usp->usp_iobase + 5); | |
110526ed KD |
459 | outb('W', usp->usp_iobase + 6); /* sends (W)rite command to module */ |
460 | ||
461 | /* sending for bytes to module(one byte per cycle iteration) */ | |
462 | for (i = 0; i < 4; i++) { | |
6fd071cc JS |
463 | while (!((inb(usp->usp_iobase + 0)) & TxBE)) |
464 | ; /* waits while writting will be allowed */ | |
110526ed KD |
465 | outb(usp->usp_extra_data[module][i], usp->usp_iobase + 6); |
466 | } | |
467 | ||
468 | return 1; | |
469 | } | |
470 | ||
0a85b6f0 MT |
471 | static int __unioxx5_analog_read(struct unioxx5_subd_priv *usp, |
472 | unsigned int *data, int channel, int minor) | |
110526ed KD |
473 | { |
474 | int module_no, read_ch; | |
475 | char control; | |
476 | ||
477 | module_no = channel / 2; | |
478 | read_ch = channel % 2; /* depend on type of channel (A or B) */ | |
479 | ||
480 | /* defining if given module can work on input */ | |
481 | if (usp->usp_module_type[module_no] & MODULE_OUTPUT_MASK) { | |
482 | printk(KERN_ERR | |
0a85b6f0 MT |
483 | "comedi%d: module in position %d with id 0x%02x is for output only", |
484 | minor, module_no, usp->usp_module_type[module_no]); | |
110526ed KD |
485 | return 0; |
486 | } | |
487 | ||
488 | __unioxx5_analog_config(usp, channel); | |
33e73e00 R |
489 | /* sends module number to card(1 .. 12) */ |
490 | outb(module_no + 1, usp->usp_iobase + 5); | |
110526ed KD |
491 | outb('V', usp->usp_iobase + 6); /* sends to module (V)erify command */ |
492 | control = inb(usp->usp_iobase); /* get control register byte */ | |
493 | ||
494 | /* waits while reading four bytes will be allowed */ | |
6fd071cc JS |
495 | while (!((control = inb(usp->usp_iobase + 0)) & Rx4CA)) |
496 | ; | |
110526ed KD |
497 | |
498 | /* if four bytes readding error occurs - return 0(false) */ | |
499 | if ((control & Rx4CA_ERR_MASK)) { | |
500 | printk("COMEDI: 4 bytes error\n"); | |
501 | return 0; | |
502 | } | |
503 | ||
504 | if (read_ch) | |
505 | *data = inw(usp->usp_iobase + 6); /* channel B */ | |
506 | else | |
507 | *data = inw(usp->usp_iobase + 4); /* channel A */ | |
508 | ||
509 | return 1; | |
510 | } | |
511 | ||
512 | /* configure channels for analog i/o (even to output, odd to input) */ | |
da91b269 | 513 | static void __unioxx5_analog_config(struct unioxx5_subd_priv *usp, int channel) |
110526ed KD |
514 | { |
515 | int chan_a, chan_b, conf, channel_offset; | |
516 | ||
517 | channel_offset = __unioxx5_define_chan_offset(channel); | |
518 | conf = usp->usp_prev_cn_val[channel_offset - 1]; | |
519 | chan_a = chan_b = 1; | |
520 | ||
521 | /* setting channel A and channel B mask */ | |
522 | if (channel % 2 == 0) { | |
523 | chan_a <<= channel & 0x07; | |
524 | chan_b <<= (channel + 1) & 0x07; | |
525 | } else { | |
526 | chan_a <<= (channel - 1) & 0x07; | |
527 | chan_b <<= channel & 0x07; | |
528 | } | |
529 | ||
530 | conf |= chan_a; /* even channel ot output */ | |
531 | conf &= ~chan_b; /* odd channel to input */ | |
532 | ||
533 | outb(1, usp->usp_iobase + 0); | |
534 | outb(conf, usp->usp_iobase + channel_offset); | |
535 | outb(0, usp->usp_iobase + 0); | |
536 | ||
537 | usp->usp_prev_cn_val[channel_offset - 1] = conf; | |
538 | } | |
539 | ||
540 | /* *\ | |
541 | * this function defines if the given channel number * | |
542 | * enters in default numeric interspace(from 0 to 23) * | |
543 | * and it returns address offset for usage needed * | |
544 | * channel. * | |
545 | \* */ | |
546 | ||
547 | static int __unioxx5_define_chan_offset(int chan_num) | |
548 | { | |
549 | ||
550 | if (chan_num < 0 || chan_num > 23) | |
551 | return -1; | |
552 | ||
553 | return (chan_num >> 3) + 1; | |
554 | } | |
90f703d3 AT |
555 | |
556 | MODULE_AUTHOR("Comedi http://www.comedi.org"); | |
557 | MODULE_DESCRIPTION("Comedi low-level driver"); | |
558 | MODULE_LICENSE("GPL"); |