1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * pcl816.c |
4 | * Comedi driver for Advantech PCL-816 cards |
5 | * |
6 | * Author: Juan Grigera <juan@grigera.com.ar> |
7 | * based on pcl818 by Michal Dobes <dobes@tesnet.cz> and bits of pcl812 |
8 | */ |
9 | |
10 | /* |
11 | * Driver: pcl816 |
12 | * Description: Advantech PCL-816 cards, PCL-814 |
13 | * Devices: [Advantech] PCL-816 (pcl816), PCL-814B (pcl814b) |
14 | * Author: Juan Grigera <juan@grigera.com.ar> |
15 | * Status: works |
16 | * Updated: Tue, 2 Apr 2002 23:15:21 -0800 |
17 | * |
18 | * PCL 816 and 814B have 16 SE/DIFF ADCs, 16 DACs, 16 DI and 16 DO. |
19 | * Differences are at resolution (16 vs 12 bits). |
20 | * |
21 | * The driver support AI command mode, other subdevices not written. |
22 | * |
23 | * Analog output and digital input and output are not supported. |
24 | * |
25 | * Configuration Options: |
26 | * [0] - IO Base |
27 | * [1] - IRQ (0=disable, 2, 3, 4, 5, 6, 7) |
28 | * [2] - DMA (0=disable, 1, 3) |
29 | * [3] - 0, 10=10MHz clock for 8254 |
30 | * 1= 1MHz clock for 8254 |
31 | */ |
32 | |
33 | #include <linux/module.h> |
34 | #include <linux/gfp.h> |
35 | #include <linux/delay.h> |
36 | #include <linux/io.h> |
37 | #include <linux/interrupt.h> |
38 | #include <linux/comedi/comedidev.h> |
39 | #include <linux/comedi/comedi_8254.h> |
40 | #include <linux/comedi/comedi_isadma.h> |
41 | |
42 | /* |
43 | * Register I/O map |
44 | */ |
45 | #define PCL816_DO_DI_LSB_REG 0x00 |
46 | #define PCL816_DO_DI_MSB_REG 0x01 |
47 | #define PCL816_TIMER_BASE 0x04 |
48 | #define PCL816_AI_LSB_REG 0x08 |
49 | #define PCL816_AI_MSB_REG 0x09 |
50 | #define PCL816_RANGE_REG 0x09 |
51 | #define PCL816_CLRINT_REG 0x0a |
52 | #define PCL816_MUX_REG 0x0b |
53 | #define PCL816_MUX_SCAN(_first, _last) (((_last) << 4) | (_first)) |
54 | #define PCL816_CTRL_REG 0x0c |
55 | #define PCL816_CTRL_SOFT_TRIG BIT(0) |
56 | #define PCL816_CTRL_PACER_TRIG BIT(1) |
57 | #define PCL816_CTRL_EXT_TRIG BIT(2) |
58 | #define PCL816_CTRL_POE BIT(3) |
59 | #define PCL816_CTRL_DMAEN BIT(4) |
60 | #define PCL816_CTRL_INTEN BIT(5) |
61 | #define PCL816_CTRL_DMASRC_SLOT(x) (((x) & 0x3) << 6) |
62 | #define PCL816_STATUS_REG 0x0d |
63 | #define PCL816_STATUS_NEXT_CHAN_MASK (0xf << 0) |
64 | #define PCL816_STATUS_INTSRC_SLOT(x) (((x) & 0x3) << 4) |
65 | #define PCL816_STATUS_INTSRC_DMA PCL816_STATUS_INTSRC_SLOT(3) |
66 | #define PCL816_STATUS_INTSRC_MASK PCL816_STATUS_INTSRC_SLOT(3) |
67 | #define PCL816_STATUS_INTACT BIT(6) |
68 | #define PCL816_STATUS_DRDY BIT(7) |
69 | |
70 | #define MAGIC_DMA_WORD 0x5a5a |
71 | |
72 | static const struct comedi_lrange range_pcl816 = { |
73 | 8, { |
74 | BIP_RANGE(10), |
75 | BIP_RANGE(5), |
76 | BIP_RANGE(2.5), |
77 | BIP_RANGE(1.25), |
78 | UNI_RANGE(10), |
79 | UNI_RANGE(5), |
80 | UNI_RANGE(2.5), |
81 | UNI_RANGE(1.25) |
82 | } |
83 | }; |
84 | |
85 | struct pcl816_board { |
86 | const char *name; |
87 | int ai_maxdata; |
88 | int ai_chanlist; |
89 | }; |
90 | |
91 | static const struct pcl816_board boardtypes[] = { |
92 | { |
93 | .name = "pcl816" , |
94 | .ai_maxdata = 0xffff, |
95 | .ai_chanlist = 1024, |
96 | }, { |
97 | .name = "pcl814b" , |
98 | .ai_maxdata = 0x3fff, |
99 | .ai_chanlist = 1024, |
100 | }, |
101 | }; |
102 | |
103 | struct pcl816_private { |
104 | struct comedi_isadma *dma; |
105 | unsigned int ai_poll_ptr; /* how many sampes transfer poll */ |
106 | unsigned int ai_cmd_running:1; |
107 | unsigned int ai_cmd_canceled:1; |
108 | }; |
109 | |
110 | static void pcl816_ai_setup_dma(struct comedi_device *dev, |
111 | struct comedi_subdevice *s, |
112 | unsigned int unread_samples) |
113 | { |
114 | struct pcl816_private *devpriv = dev->private; |
115 | struct comedi_isadma *dma = devpriv->dma; |
116 | struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma]; |
117 | unsigned int max_samples = comedi_bytes_to_samples(s, nbytes: desc->maxsize); |
118 | unsigned int nsamples; |
119 | |
120 | comedi_isadma_disable(dma_chan: dma->chan); |
121 | |
122 | /* |
123 | * Determine dma size based on the buffer maxsize plus the number of |
124 | * unread samples and the number of samples remaining in the command. |
125 | */ |
126 | nsamples = comedi_nsamples_left(s, nsamples: max_samples + unread_samples); |
127 | if (nsamples > unread_samples) { |
128 | nsamples -= unread_samples; |
129 | desc->size = comedi_samples_to_bytes(s, nsamples); |
130 | comedi_isadma_program(desc); |
131 | } |
132 | } |
133 | |
134 | static void pcl816_ai_set_chan_range(struct comedi_device *dev, |
135 | unsigned int chan, |
136 | unsigned int range) |
137 | { |
138 | outb(value: chan, port: dev->iobase + PCL816_MUX_REG); |
139 | outb(value: range, port: dev->iobase + PCL816_RANGE_REG); |
140 | } |
141 | |
142 | static void pcl816_ai_set_chan_scan(struct comedi_device *dev, |
143 | unsigned int first_chan, |
144 | unsigned int last_chan) |
145 | { |
146 | outb(PCL816_MUX_SCAN(first_chan, last_chan), |
147 | port: dev->iobase + PCL816_MUX_REG); |
148 | } |
149 | |
150 | static void pcl816_ai_setup_chanlist(struct comedi_device *dev, |
151 | unsigned int *chanlist, |
152 | unsigned int seglen) |
153 | { |
154 | unsigned int first_chan = CR_CHAN(chanlist[0]); |
155 | unsigned int last_chan; |
156 | unsigned int range; |
157 | unsigned int i; |
158 | |
159 | /* store range list to card */ |
160 | for (i = 0; i < seglen; i++) { |
161 | last_chan = CR_CHAN(chanlist[i]); |
162 | range = CR_RANGE(chanlist[i]); |
163 | |
164 | pcl816_ai_set_chan_range(dev, chan: last_chan, range); |
165 | } |
166 | |
167 | udelay(1); |
168 | |
169 | pcl816_ai_set_chan_scan(dev, first_chan, last_chan); |
170 | } |
171 | |
172 | static void pcl816_ai_clear_eoc(struct comedi_device *dev) |
173 | { |
174 | /* writing any value clears the interrupt request */ |
175 | outb(value: 0, port: dev->iobase + PCL816_CLRINT_REG); |
176 | } |
177 | |
178 | static void pcl816_ai_soft_trig(struct comedi_device *dev) |
179 | { |
180 | /* writing any value triggers a software conversion */ |
181 | outb(value: 0, port: dev->iobase + PCL816_AI_LSB_REG); |
182 | } |
183 | |
184 | static unsigned int pcl816_ai_get_sample(struct comedi_device *dev, |
185 | struct comedi_subdevice *s) |
186 | { |
187 | unsigned int val; |
188 | |
189 | val = inb(port: dev->iobase + PCL816_AI_MSB_REG) << 8; |
190 | val |= inb(port: dev->iobase + PCL816_AI_LSB_REG); |
191 | |
192 | return val & s->maxdata; |
193 | } |
194 | |
195 | static int pcl816_ai_eoc(struct comedi_device *dev, |
196 | struct comedi_subdevice *s, |
197 | struct comedi_insn *insn, |
198 | unsigned long context) |
199 | { |
200 | unsigned int status; |
201 | |
202 | status = inb(port: dev->iobase + PCL816_STATUS_REG); |
203 | if ((status & PCL816_STATUS_DRDY) == 0) |
204 | return 0; |
205 | return -EBUSY; |
206 | } |
207 | |
208 | static bool pcl816_ai_next_chan(struct comedi_device *dev, |
209 | struct comedi_subdevice *s) |
210 | { |
211 | struct comedi_cmd *cmd = &s->async->cmd; |
212 | |
213 | if (cmd->stop_src == TRIG_COUNT && |
214 | s->async->scans_done >= cmd->stop_arg) { |
215 | s->async->events |= COMEDI_CB_EOA; |
216 | return false; |
217 | } |
218 | |
219 | return true; |
220 | } |
221 | |
222 | static void transfer_from_dma_buf(struct comedi_device *dev, |
223 | struct comedi_subdevice *s, |
224 | unsigned short *ptr, |
225 | unsigned int bufptr, unsigned int len) |
226 | { |
227 | unsigned short val; |
228 | int i; |
229 | |
230 | for (i = 0; i < len; i++) { |
231 | val = ptr[bufptr++]; |
232 | comedi_buf_write_samples(s, data: &val, nsamples: 1); |
233 | |
234 | if (!pcl816_ai_next_chan(dev, s)) |
235 | return; |
236 | } |
237 | } |
238 | |
239 | static irqreturn_t pcl816_interrupt(int irq, void *d) |
240 | { |
241 | struct comedi_device *dev = d; |
242 | struct comedi_subdevice *s = dev->read_subdev; |
243 | struct pcl816_private *devpriv = dev->private; |
244 | struct comedi_isadma *dma = devpriv->dma; |
245 | struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma]; |
246 | unsigned int nsamples; |
247 | unsigned int bufptr; |
248 | |
249 | if (!dev->attached || !devpriv->ai_cmd_running) { |
250 | pcl816_ai_clear_eoc(dev); |
251 | return IRQ_HANDLED; |
252 | } |
253 | |
254 | if (devpriv->ai_cmd_canceled) { |
255 | devpriv->ai_cmd_canceled = 0; |
256 | pcl816_ai_clear_eoc(dev); |
257 | return IRQ_HANDLED; |
258 | } |
259 | |
260 | nsamples = comedi_bytes_to_samples(s, nbytes: desc->size) - |
261 | devpriv->ai_poll_ptr; |
262 | bufptr = devpriv->ai_poll_ptr; |
263 | devpriv->ai_poll_ptr = 0; |
264 | |
265 | /* restart dma with the next buffer */ |
266 | dma->cur_dma = 1 - dma->cur_dma; |
267 | pcl816_ai_setup_dma(dev, s, unread_samples: nsamples); |
268 | |
269 | transfer_from_dma_buf(dev, s, ptr: desc->virt_addr, bufptr, len: nsamples); |
270 | |
271 | pcl816_ai_clear_eoc(dev); |
272 | |
273 | comedi_handle_events(dev, s); |
274 | return IRQ_HANDLED; |
275 | } |
276 | |
277 | static int check_channel_list(struct comedi_device *dev, |
278 | struct comedi_subdevice *s, |
279 | unsigned int *chanlist, |
280 | unsigned int chanlen) |
281 | { |
282 | unsigned int chansegment[16]; |
283 | unsigned int i, nowmustbechan, seglen; |
284 | |
285 | /* correct channel and range number check itself comedi/range.c */ |
286 | if (chanlen < 1) { |
287 | dev_err(dev->class_dev, "range/channel list is empty!\n" ); |
288 | return 0; |
289 | } |
290 | |
291 | if (chanlen > 1) { |
292 | /* first channel is every time ok */ |
293 | chansegment[0] = chanlist[0]; |
294 | for (i = 1, seglen = 1; i < chanlen; i++, seglen++) { |
295 | /* we detect loop, this must by finish */ |
296 | if (chanlist[0] == chanlist[i]) |
297 | break; |
298 | nowmustbechan = |
299 | (CR_CHAN(chansegment[i - 1]) + 1) % chanlen; |
300 | if (nowmustbechan != CR_CHAN(chanlist[i])) { |
301 | /* channel list isn't continuous :-( */ |
302 | dev_dbg(dev->class_dev, |
303 | "channel list must be continuous! chanlist[%i]=%d but must be %d or %d!\n" , |
304 | i, CR_CHAN(chanlist[i]), nowmustbechan, |
305 | CR_CHAN(chanlist[0])); |
306 | return 0; |
307 | } |
308 | /* well, this is next correct channel in list */ |
309 | chansegment[i] = chanlist[i]; |
310 | } |
311 | |
312 | /* check whole chanlist */ |
313 | for (i = 0; i < chanlen; i++) { |
314 | if (chanlist[i] != chansegment[i % seglen]) { |
315 | dev_dbg(dev->class_dev, |
316 | "bad channel or range number! chanlist[%i]=%d,%d,%d and not %d,%d,%d!\n" , |
317 | i, CR_CHAN(chansegment[i]), |
318 | CR_RANGE(chansegment[i]), |
319 | CR_AREF(chansegment[i]), |
320 | CR_CHAN(chanlist[i % seglen]), |
321 | CR_RANGE(chanlist[i % seglen]), |
322 | CR_AREF(chansegment[i % seglen])); |
323 | return 0; /* chan/gain list is strange */ |
324 | } |
325 | } |
326 | } else { |
327 | seglen = 1; |
328 | } |
329 | |
330 | return seglen; /* we can serve this with MUX logic */ |
331 | } |
332 | |
333 | static int pcl816_ai_cmdtest(struct comedi_device *dev, |
334 | struct comedi_subdevice *s, struct comedi_cmd *cmd) |
335 | { |
336 | int err = 0; |
337 | |
338 | /* Step 1 : check if triggers are trivially valid */ |
339 | |
340 | err |= comedi_check_trigger_src(src: &cmd->start_src, TRIG_NOW); |
341 | err |= comedi_check_trigger_src(src: &cmd->scan_begin_src, TRIG_FOLLOW); |
342 | err |= comedi_check_trigger_src(src: &cmd->convert_src, |
343 | TRIG_EXT | TRIG_TIMER); |
344 | err |= comedi_check_trigger_src(src: &cmd->scan_end_src, TRIG_COUNT); |
345 | err |= comedi_check_trigger_src(src: &cmd->stop_src, TRIG_COUNT | TRIG_NONE); |
346 | |
347 | if (err) |
348 | return 1; |
349 | |
350 | /* Step 2a : make sure trigger sources are unique */ |
351 | |
352 | err |= comedi_check_trigger_is_unique(src: cmd->convert_src); |
353 | err |= comedi_check_trigger_is_unique(src: cmd->stop_src); |
354 | |
355 | /* Step 2b : and mutually compatible */ |
356 | |
357 | if (err) |
358 | return 2; |
359 | |
360 | /* Step 3: check if arguments are trivially valid */ |
361 | |
362 | err |= comedi_check_trigger_arg_is(arg: &cmd->start_arg, val: 0); |
363 | err |= comedi_check_trigger_arg_is(arg: &cmd->scan_begin_arg, val: 0); |
364 | |
365 | if (cmd->convert_src == TRIG_TIMER) |
366 | err |= comedi_check_trigger_arg_min(arg: &cmd->convert_arg, val: 10000); |
367 | else /* TRIG_EXT */ |
368 | err |= comedi_check_trigger_arg_is(arg: &cmd->convert_arg, val: 0); |
369 | |
370 | err |= comedi_check_trigger_arg_is(arg: &cmd->scan_end_arg, |
371 | val: cmd->chanlist_len); |
372 | |
373 | if (cmd->stop_src == TRIG_COUNT) |
374 | err |= comedi_check_trigger_arg_min(arg: &cmd->stop_arg, val: 1); |
375 | else /* TRIG_NONE */ |
376 | err |= comedi_check_trigger_arg_is(arg: &cmd->stop_arg, val: 0); |
377 | |
378 | if (err) |
379 | return 3; |
380 | |
381 | /* step 4: fix up any arguments */ |
382 | if (cmd->convert_src == TRIG_TIMER) { |
383 | unsigned int arg = cmd->convert_arg; |
384 | |
385 | comedi_8254_cascade_ns_to_timer(i8254: dev->pacer, nanosec: &arg, flags: cmd->flags); |
386 | err |= comedi_check_trigger_arg_is(arg: &cmd->convert_arg, val: arg); |
387 | } |
388 | |
389 | if (err) |
390 | return 4; |
391 | |
392 | /* step 5: complain about special chanlist considerations */ |
393 | |
394 | if (cmd->chanlist) { |
395 | if (!check_channel_list(dev, s, chanlist: cmd->chanlist, |
396 | chanlen: cmd->chanlist_len)) |
397 | return 5; /* incorrect channels list */ |
398 | } |
399 | |
400 | return 0; |
401 | } |
402 | |
403 | static int pcl816_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) |
404 | { |
405 | struct pcl816_private *devpriv = dev->private; |
406 | struct comedi_isadma *dma = devpriv->dma; |
407 | struct comedi_cmd *cmd = &s->async->cmd; |
408 | unsigned int ctrl; |
409 | unsigned int seglen; |
410 | |
411 | if (devpriv->ai_cmd_running) |
412 | return -EBUSY; |
413 | |
414 | seglen = check_channel_list(dev, s, chanlist: cmd->chanlist, chanlen: cmd->chanlist_len); |
415 | if (seglen < 1) |
416 | return -EINVAL; |
417 | pcl816_ai_setup_chanlist(dev, chanlist: cmd->chanlist, seglen); |
418 | udelay(1); |
419 | |
420 | devpriv->ai_cmd_running = 1; |
421 | devpriv->ai_poll_ptr = 0; |
422 | devpriv->ai_cmd_canceled = 0; |
423 | |
424 | /* setup and enable dma for the first buffer */ |
425 | dma->cur_dma = 0; |
426 | pcl816_ai_setup_dma(dev, s, unread_samples: 0); |
427 | |
428 | comedi_8254_set_mode(i8254: dev->pacer, counter: 0, mode: I8254_MODE1 | I8254_BINARY); |
429 | comedi_8254_write(i8254: dev->pacer, counter: 0, val: 0x0ff); |
430 | udelay(1); |
431 | comedi_8254_update_divisors(i8254: dev->pacer); |
432 | comedi_8254_pacer_enable(i8254: dev->pacer, counter1: 1, counter2: 2, enable: true); |
433 | |
434 | ctrl = PCL816_CTRL_INTEN | PCL816_CTRL_DMAEN | |
435 | PCL816_CTRL_DMASRC_SLOT(0); |
436 | if (cmd->convert_src == TRIG_TIMER) |
437 | ctrl |= PCL816_CTRL_PACER_TRIG; |
438 | else /* TRIG_EXT */ |
439 | ctrl |= PCL816_CTRL_EXT_TRIG; |
440 | |
441 | outb(value: ctrl, port: dev->iobase + PCL816_CTRL_REG); |
442 | outb(value: (dma->chan << 4) | dev->irq, |
443 | port: dev->iobase + PCL816_STATUS_REG); |
444 | |
445 | return 0; |
446 | } |
447 | |
448 | static int pcl816_ai_poll(struct comedi_device *dev, struct comedi_subdevice *s) |
449 | { |
450 | struct pcl816_private *devpriv = dev->private; |
451 | struct comedi_isadma *dma = devpriv->dma; |
452 | struct comedi_isadma_desc *desc; |
453 | unsigned long flags; |
454 | unsigned int poll; |
455 | int ret; |
456 | |
457 | spin_lock_irqsave(&dev->spinlock, flags); |
458 | |
459 | poll = comedi_isadma_poll(dma); |
460 | poll = comedi_bytes_to_samples(s, nbytes: poll); |
461 | if (poll > devpriv->ai_poll_ptr) { |
462 | desc = &dma->desc[dma->cur_dma]; |
463 | transfer_from_dma_buf(dev, s, ptr: desc->virt_addr, |
464 | bufptr: devpriv->ai_poll_ptr, |
465 | len: poll - devpriv->ai_poll_ptr); |
466 | /* new buffer position */ |
467 | devpriv->ai_poll_ptr = poll; |
468 | |
469 | comedi_handle_events(dev, s); |
470 | |
471 | ret = comedi_buf_n_bytes_ready(s); |
472 | } else { |
473 | /* no new samples */ |
474 | ret = 0; |
475 | } |
476 | spin_unlock_irqrestore(lock: &dev->spinlock, flags); |
477 | |
478 | return ret; |
479 | } |
480 | |
481 | static int pcl816_ai_cancel(struct comedi_device *dev, |
482 | struct comedi_subdevice *s) |
483 | { |
484 | struct pcl816_private *devpriv = dev->private; |
485 | |
486 | if (!devpriv->ai_cmd_running) |
487 | return 0; |
488 | |
489 | outb(value: 0, port: dev->iobase + PCL816_CTRL_REG); |
490 | pcl816_ai_clear_eoc(dev); |
491 | |
492 | comedi_8254_pacer_enable(i8254: dev->pacer, counter1: 1, counter2: 2, enable: false); |
493 | |
494 | devpriv->ai_cmd_running = 0; |
495 | devpriv->ai_cmd_canceled = 1; |
496 | |
497 | return 0; |
498 | } |
499 | |
500 | static int pcl816_ai_insn_read(struct comedi_device *dev, |
501 | struct comedi_subdevice *s, |
502 | struct comedi_insn *insn, |
503 | unsigned int *data) |
504 | { |
505 | unsigned int chan = CR_CHAN(insn->chanspec); |
506 | unsigned int range = CR_RANGE(insn->chanspec); |
507 | int ret = 0; |
508 | int i; |
509 | |
510 | outb(PCL816_CTRL_SOFT_TRIG, port: dev->iobase + PCL816_CTRL_REG); |
511 | |
512 | pcl816_ai_set_chan_range(dev, chan, range); |
513 | pcl816_ai_set_chan_scan(dev, first_chan: chan, last_chan: chan); |
514 | |
515 | for (i = 0; i < insn->n; i++) { |
516 | pcl816_ai_clear_eoc(dev); |
517 | pcl816_ai_soft_trig(dev); |
518 | |
519 | ret = comedi_timeout(dev, s, insn, cb: pcl816_ai_eoc, context: 0); |
520 | if (ret) |
521 | break; |
522 | |
523 | data[i] = pcl816_ai_get_sample(dev, s); |
524 | } |
525 | outb(value: 0, port: dev->iobase + PCL816_CTRL_REG); |
526 | pcl816_ai_clear_eoc(dev); |
527 | |
528 | return ret ? ret : insn->n; |
529 | } |
530 | |
531 | static int pcl816_di_insn_bits(struct comedi_device *dev, |
532 | struct comedi_subdevice *s, |
533 | struct comedi_insn *insn, |
534 | unsigned int *data) |
535 | { |
536 | data[1] = inb(port: dev->iobase + PCL816_DO_DI_LSB_REG) | |
537 | (inb(port: dev->iobase + PCL816_DO_DI_MSB_REG) << 8); |
538 | |
539 | return insn->n; |
540 | } |
541 | |
542 | static int pcl816_do_insn_bits(struct comedi_device *dev, |
543 | struct comedi_subdevice *s, |
544 | struct comedi_insn *insn, |
545 | unsigned int *data) |
546 | { |
547 | if (comedi_dio_update_state(s, data)) { |
548 | outb(value: s->state & 0xff, port: dev->iobase + PCL816_DO_DI_LSB_REG); |
549 | outb(value: (s->state >> 8), port: dev->iobase + PCL816_DO_DI_MSB_REG); |
550 | } |
551 | |
552 | data[1] = s->state; |
553 | |
554 | return insn->n; |
555 | } |
556 | |
557 | static void pcl816_reset(struct comedi_device *dev) |
558 | { |
559 | outb(value: 0, port: dev->iobase + PCL816_CTRL_REG); |
560 | pcl816_ai_set_chan_range(dev, chan: 0, range: 0); |
561 | pcl816_ai_clear_eoc(dev); |
562 | |
563 | /* set all digital outputs low */ |
564 | outb(value: 0, port: dev->iobase + PCL816_DO_DI_LSB_REG); |
565 | outb(value: 0, port: dev->iobase + PCL816_DO_DI_MSB_REG); |
566 | } |
567 | |
568 | static void pcl816_alloc_irq_and_dma(struct comedi_device *dev, |
569 | struct comedi_devconfig *it) |
570 | { |
571 | struct pcl816_private *devpriv = dev->private; |
572 | unsigned int irq_num = it->options[1]; |
573 | unsigned int dma_chan = it->options[2]; |
574 | |
575 | /* only IRQs 2-7 and DMA channels 3 and 1 are valid */ |
576 | if (!(irq_num >= 2 && irq_num <= 7) || |
577 | !(dma_chan == 3 || dma_chan == 1)) |
578 | return; |
579 | |
580 | if (request_irq(irq: irq_num, handler: pcl816_interrupt, flags: 0, name: dev->board_name, dev)) |
581 | return; |
582 | |
583 | /* DMA uses two 16K buffers */ |
584 | devpriv->dma = comedi_isadma_alloc(dev, n_desc: 2, dma_chan1: dma_chan, dma_chan2: dma_chan, |
585 | PAGE_SIZE * 4, COMEDI_ISADMA_READ); |
586 | if (!devpriv->dma) |
587 | free_irq(irq_num, dev); |
588 | else |
589 | dev->irq = irq_num; |
590 | } |
591 | |
592 | static void pcl816_free_dma(struct comedi_device *dev) |
593 | { |
594 | struct pcl816_private *devpriv = dev->private; |
595 | |
596 | if (devpriv) |
597 | comedi_isadma_free(dma: devpriv->dma); |
598 | } |
599 | |
600 | static int pcl816_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
601 | { |
602 | const struct pcl816_board *board = dev->board_ptr; |
603 | struct pcl816_private *devpriv; |
604 | struct comedi_subdevice *s; |
605 | int ret; |
606 | |
607 | devpriv = comedi_alloc_devpriv(dev, size: sizeof(*devpriv)); |
608 | if (!devpriv) |
609 | return -ENOMEM; |
610 | |
611 | ret = comedi_request_region(dev, start: it->options[0], len: 0x10); |
612 | if (ret) |
613 | return ret; |
614 | |
615 | /* an IRQ and DMA are required to support async commands */ |
616 | pcl816_alloc_irq_and_dma(dev, it); |
617 | |
618 | dev->pacer = comedi_8254_io_alloc(iobase: dev->iobase + PCL816_TIMER_BASE, |
619 | I8254_OSC_BASE_10MHZ, I8254_IO8, regshift: 0); |
620 | if (IS_ERR(ptr: dev->pacer)) |
621 | return PTR_ERR(ptr: dev->pacer); |
622 | |
623 | ret = comedi_alloc_subdevices(dev, num_subdevices: 4); |
624 | if (ret) |
625 | return ret; |
626 | |
627 | s = &dev->subdevices[0]; |
628 | s->type = COMEDI_SUBD_AI; |
629 | s->subdev_flags = SDF_CMD_READ | SDF_DIFF; |
630 | s->n_chan = 16; |
631 | s->maxdata = board->ai_maxdata; |
632 | s->range_table = &range_pcl816; |
633 | s->insn_read = pcl816_ai_insn_read; |
634 | if (dev->irq) { |
635 | dev->read_subdev = s; |
636 | s->subdev_flags |= SDF_CMD_READ; |
637 | s->len_chanlist = board->ai_chanlist; |
638 | s->do_cmdtest = pcl816_ai_cmdtest; |
639 | s->do_cmd = pcl816_ai_cmd; |
640 | s->poll = pcl816_ai_poll; |
641 | s->cancel = pcl816_ai_cancel; |
642 | } |
643 | |
644 | /* Piggyback Slot1 subdevice */ |
645 | s = &dev->subdevices[1]; |
646 | s->type = COMEDI_SUBD_UNUSED; |
647 | |
648 | /* Digital Input subdevice */ |
649 | s = &dev->subdevices[2]; |
650 | s->type = COMEDI_SUBD_DI; |
651 | s->subdev_flags = SDF_READABLE; |
652 | s->n_chan = 16; |
653 | s->maxdata = 1; |
654 | s->range_table = &range_digital; |
655 | s->insn_bits = pcl816_di_insn_bits; |
656 | |
657 | /* Digital Output subdevice */ |
658 | s = &dev->subdevices[3]; |
659 | s->type = COMEDI_SUBD_DO; |
660 | s->subdev_flags = SDF_WRITABLE; |
661 | s->n_chan = 16; |
662 | s->maxdata = 1; |
663 | s->range_table = &range_digital; |
664 | s->insn_bits = pcl816_do_insn_bits; |
665 | |
666 | pcl816_reset(dev); |
667 | |
668 | return 0; |
669 | } |
670 | |
671 | static void pcl816_detach(struct comedi_device *dev) |
672 | { |
673 | if (dev->private) { |
674 | pcl816_ai_cancel(dev, s: dev->read_subdev); |
675 | pcl816_reset(dev); |
676 | } |
677 | pcl816_free_dma(dev); |
678 | comedi_legacy_detach(dev); |
679 | } |
680 | |
681 | static struct comedi_driver pcl816_driver = { |
682 | .driver_name = "pcl816" , |
683 | .module = THIS_MODULE, |
684 | .attach = pcl816_attach, |
685 | .detach = pcl816_detach, |
686 | .board_name = &boardtypes[0].name, |
687 | .num_names = ARRAY_SIZE(boardtypes), |
688 | .offset = sizeof(struct pcl816_board), |
689 | }; |
690 | module_comedi_driver(pcl816_driver); |
691 | |
692 | MODULE_AUTHOR("Comedi https://www.comedi.org" ); |
693 | MODULE_DESCRIPTION("Comedi low-level driver" ); |
694 | MODULE_LICENSE("GPL" ); |
695 | |