2 * comedi/drivers/das08.c
3 * comedi module for common DAS08 support (used by ISA/PCI/PCMCIA drivers)
5 * COMEDI - Linux Control and Measurement Device Interface
6 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
7 * Copyright (C) 2001,2002,2003 Frank Mori Hess <fmhess@users.sourceforge.net>
8 * Copyright (C) 2004 Salvador E. Tropea <set@users.sf.net> <set@ieee.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
21 #include <linux/module.h>
23 #include "../comedidev.h"
26 #include "comedi_8254.h"
34 0 a/d bits 0-3 start 8 bit
35 1 a/d bits 4-11 start 12 bit
36 2 eoc, ip1-3, irq, mux op1-4, inte, mux
41 requires hard-wiring for async ai
46 * Data format of DAS08_AI_LSB_REG and DAS08_AI_MSB_REG depends on
47 * 'ai_encoding' member of board structure:
49 * das08_encode12 : DATA[11..4] = MSB[7..0], DATA[3..0] = LSB[7..4].
50 * das08_pcm_encode12 : DATA[11..8] = MSB[3..0], DATA[7..9] = LSB[7..0].
51 * das08_encode16 : SIGN = MSB[7], MAGNITUDE[14..8] = MSB[6..0],
52 * MAGNITUDE[7..0] = LSB[7..0].
53 * SIGN==0 for negative input, SIGN==1 for positive input.
54 * Note: when read a second time after conversion
55 * complete, MSB[7] is an "over-range" bit.
57 #define DAS08_AI_LSB_REG 0x00 /* (R) AI least significant bits */
58 #define DAS08_AI_MSB_REG 0x01 /* (R) AI most significant bits */
59 #define DAS08_AI_TRIG_REG 0x01 /* (W) AI software trigger */
60 #define DAS08_STATUS_REG 0x02 /* (R) status */
61 #define DAS08_STATUS_AI_BUSY BIT(7) /* AI conversion in progress */
63 * The IRQ status bit is set to 1 by a rising edge on the external interrupt
64 * input (which may be jumpered to the pacer output). It is cleared by
65 * setting the INTE control bit to 0. Not present on "JR" boards.
67 #define DAS08_STATUS_IRQ BIT(3) /* latched interrupt input */
68 /* digital inputs (not "JR" boards) */
69 #define DAS08_STATUS_DI(x) (((x) & 0x70) >> 4)
70 #define DAS08_CONTROL_REG 0x02 /* (W) control */
72 * Note: The AI multiplexor channel can also be read from status register using
75 #define DAS08_CONTROL_MUX_MASK 0x7 /* multiplexor channel mask */
76 #define DAS08_CONTROL_MUX(x) ((x) & DAS08_CONTROL_MUX_MASK) /* mux channel */
77 #define DAS08_CONTROL_INTE BIT(3) /* interrupt enable (not "JR" boards) */
78 #define DAS08_CONTROL_DO_MASK 0xf0 /* digital outputs mask (not "JR") */
79 /* digital outputs (not "JR" boards) */
80 #define DAS08_CONTROL_DO(x) (((x) << 4) & DAS08_CONTROL_DO_MASK)
82 * (R/W) programmable AI gain ("PGx" and "AOx" boards):
83 * + bits 3..0 (R/W) show/set the gain for the current AI mux channel
84 * + bits 6..4 (R) show the current AI mux channel
85 * + bit 7 (R) not unused
87 #define DAS08_GAIN_REG 0x03
95 1 a/d bits 4-11 start 12 bit
105 #define DAS08JR_DI_REG 0x03 /* (R) digital inputs ("JR" boards) */
106 #define DAS08JR_DO_REG 0x03 /* (W) digital outputs ("JR" boards) */
107 /* (W) analog output l.s.b. registers for 2 channels ("JR" boards) */
108 #define DAS08JR_AO_LSB_REG(x) ((x) ? 0x06 : 0x04)
109 /* (W) analog output m.s.b. registers for 2 channels ("JR" boards) */
110 #define DAS08JR_AO_MSB_REG(x) ((x) ? 0x07 : 0x05)
112 * (R) update analog outputs ("JR" boards set for simultaneous output)
113 * (same register as digital inputs)
115 #define DAS08JR_AO_UPDATE_REG 0x03
124 0 a/d bits 0-3 start 8 bit
125 1 a/d bits 4-11 start 12 bit
126 2 eoc, ip1-3, irq, mux op1-4, inte, mux
127 3 mux, gain status gain control
137 /* (W) analog output l.s.b. registers for 2 channels ("AOx" boards) */
138 #define DAS08AOX_AO_LSB_REG(x) ((x) ? 0x0a : 0x08)
139 /* (W) analog output m.s.b. registers for 2 channels ("AOx" boards) */
140 #define DAS08AOX_AO_MSB_REG(x) ((x) ? 0x0b : 0x09)
141 #define DAS08AO_AO_UPDATE 8
143 /* gainlist same as _pgx_ below */
145 static const struct comedi_lrange range_das08_pgl = {
159 static const struct comedi_lrange range_das08_pgh = {
176 static const struct comedi_lrange range_das08_pgm = {
193 0 a/d bits 0-3 unused
194 1 a/d bits 4-11 start 12 bit
204 static const struct comedi_lrange *const das08_ai_lranges[] = {
205 [das08_pg_none] = &range_unknown,
206 [das08_bipolar5] = &range_bipolar5,
207 [das08_pgh] = &range_das08_pgh,
208 [das08_pgl] = &range_das08_pgl,
209 [das08_pgm] = &range_das08_pgm,
212 static const int das08_pgh_gainlist[] = {
213 8, 0, 10, 2, 12, 4, 14, 6, 1, 3, 5, 7
215 static const int das08_pgl_gainlist[] = { 8, 0, 2, 4, 6, 1, 3, 5, 7 };
216 static const int das08_pgm_gainlist[] = { 8, 0, 10, 12, 14, 9, 11, 13, 15 };
218 static const int *const das08_gainlists[] = {
219 [das08_pg_none] = NULL,
220 [das08_bipolar5] = NULL,
221 [das08_pgh] = das08_pgh_gainlist,
222 [das08_pgl] = das08_pgl_gainlist,
223 [das08_pgm] = das08_pgm_gainlist,
226 static int das08_ai_eoc(struct comedi_device *dev,
227 struct comedi_subdevice *s,
228 struct comedi_insn *insn,
229 unsigned long context)
233 status = inb(dev->iobase + DAS08_STATUS_REG);
234 if ((status & DAS08_STATUS_AI_BUSY) == 0)
239 static int das08_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
240 struct comedi_insn *insn, unsigned int *data)
242 const struct das08_board_struct *thisboard = dev->board_ptr;
243 struct das08_private_struct *devpriv = dev->private;
250 chan = CR_CHAN(insn->chanspec);
251 range = CR_RANGE(insn->chanspec);
254 inb(dev->iobase + DAS08_AI_LSB_REG);
255 inb(dev->iobase + DAS08_AI_MSB_REG);
257 /* set multiplexer */
258 /* lock to prevent race with digital output */
259 spin_lock(&dev->spinlock);
260 devpriv->do_mux_bits &= ~DAS08_CONTROL_MUX_MASK;
261 devpriv->do_mux_bits |= DAS08_CONTROL_MUX(chan);
262 outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
263 spin_unlock(&dev->spinlock);
265 if (devpriv->pg_gainlist) {
267 range = CR_RANGE(insn->chanspec);
268 outb(devpriv->pg_gainlist[range],
269 dev->iobase + DAS08_GAIN_REG);
272 for (n = 0; n < insn->n; n++) {
273 /* clear over-range bits for 16-bit boards */
274 if (thisboard->ai_nbits == 16)
275 if (inb(dev->iobase + DAS08_AI_MSB_REG) & 0x80)
276 dev_info(dev->class_dev, "over-range\n");
278 /* trigger conversion */
279 outb_p(0, dev->iobase + DAS08_AI_TRIG_REG);
281 ret = comedi_timeout(dev, s, insn, das08_ai_eoc, 0);
285 msb = inb(dev->iobase + DAS08_AI_MSB_REG);
286 lsb = inb(dev->iobase + DAS08_AI_LSB_REG);
287 if (thisboard->ai_encoding == das08_encode12) {
288 data[n] = (lsb >> 4) | (msb << 4);
289 } else if (thisboard->ai_encoding == das08_pcm_encode12) {
290 data[n] = (msb << 8) + lsb;
291 } else if (thisboard->ai_encoding == das08_encode16) {
292 /* FPOS 16-bit boards are sign-magnitude */
294 data[n] = (1 << 15) | lsb | ((msb & 0x7f) << 8);
296 data[n] = (1 << 15) - (lsb | (msb & 0x7f) << 8);
298 dev_err(dev->class_dev, "bug! unknown ai encoding\n");
306 static int das08_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
307 struct comedi_insn *insn, unsigned int *data)
310 data[1] = DAS08_STATUS_DI(inb(dev->iobase + DAS08_STATUS_REG));
315 static int das08_do_wbits(struct comedi_device *dev,
316 struct comedi_subdevice *s,
317 struct comedi_insn *insn,
320 struct das08_private_struct *devpriv = dev->private;
322 if (comedi_dio_update_state(s, data)) {
323 /* prevent race with setting of analog input mux */
324 spin_lock(&dev->spinlock);
325 devpriv->do_mux_bits &= ~DAS08_CONTROL_DO_MASK;
326 devpriv->do_mux_bits |= DAS08_CONTROL_DO(s->state);
327 outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
328 spin_unlock(&dev->spinlock);
336 static int das08jr_di_rbits(struct comedi_device *dev,
337 struct comedi_subdevice *s,
338 struct comedi_insn *insn, unsigned int *data)
341 data[1] = inb(dev->iobase + DAS08JR_DI_REG);
346 static int das08jr_do_wbits(struct comedi_device *dev,
347 struct comedi_subdevice *s,
348 struct comedi_insn *insn,
351 if (comedi_dio_update_state(s, data))
352 outb(s->state, dev->iobase + DAS08JR_DO_REG);
359 static void das08_ao_set_data(struct comedi_device *dev,
360 unsigned int chan, unsigned int data)
362 const struct das08_board_struct *thisboard = dev->board_ptr;
367 msb = (data >> 8) & 0xff;
368 if (thisboard->is_jr) {
369 outb(lsb, dev->iobase + DAS08JR_AO_LSB_REG(chan));
370 outb(msb, dev->iobase + DAS08JR_AO_MSB_REG(chan));
372 inb(dev->iobase + DAS08JR_AO_UPDATE_REG);
374 outb(lsb, dev->iobase + DAS08AOX_AO_LSB_REG(chan));
375 outb(msb, dev->iobase + DAS08AOX_AO_MSB_REG(chan));
377 inb(dev->iobase + DAS08AO_AO_UPDATE);
381 static int das08_ao_insn_write(struct comedi_device *dev,
382 struct comedi_subdevice *s,
383 struct comedi_insn *insn,
386 unsigned int chan = CR_CHAN(insn->chanspec);
387 unsigned int val = s->readback[chan];
390 for (i = 0; i < insn->n; i++) {
392 das08_ao_set_data(dev, chan, val);
394 s->readback[chan] = val;
399 int das08_common_attach(struct comedi_device *dev, unsigned long iobase)
401 const struct das08_board_struct *thisboard = dev->board_ptr;
402 struct das08_private_struct *devpriv = dev->private;
403 struct comedi_subdevice *s;
407 dev->iobase = iobase;
409 dev->board_name = thisboard->name;
411 ret = comedi_alloc_subdevices(dev, 6);
415 s = &dev->subdevices[0];
417 if (thisboard->ai_nbits) {
418 s->type = COMEDI_SUBD_AI;
419 /* XXX some boards actually have differential
420 * inputs instead of single ended.
421 * The driver does nothing with arefs though,
422 * so it's no big deal.
424 s->subdev_flags = SDF_READABLE | SDF_GROUND;
426 s->maxdata = (1 << thisboard->ai_nbits) - 1;
427 s->range_table = das08_ai_lranges[thisboard->ai_pg];
428 s->insn_read = das08_ai_rinsn;
429 devpriv->pg_gainlist = das08_gainlists[thisboard->ai_pg];
431 s->type = COMEDI_SUBD_UNUSED;
434 s = &dev->subdevices[1];
436 if (thisboard->ao_nbits) {
437 s->type = COMEDI_SUBD_AO;
438 s->subdev_flags = SDF_WRITABLE;
440 s->maxdata = (1 << thisboard->ao_nbits) - 1;
441 s->range_table = &range_bipolar5;
442 s->insn_write = das08_ao_insn_write;
444 ret = comedi_alloc_subdev_readback(s);
448 /* initialize all channels to 0V */
449 for (i = 0; i < s->n_chan; i++) {
450 s->readback[i] = s->maxdata / 2;
451 das08_ao_set_data(dev, i, s->readback[i]);
454 s->type = COMEDI_SUBD_UNUSED;
457 s = &dev->subdevices[2];
459 if (thisboard->di_nchan) {
460 s->type = COMEDI_SUBD_DI;
461 s->subdev_flags = SDF_READABLE;
462 s->n_chan = thisboard->di_nchan;
464 s->range_table = &range_digital;
466 thisboard->is_jr ? das08jr_di_rbits : das08_di_rbits;
468 s->type = COMEDI_SUBD_UNUSED;
471 s = &dev->subdevices[3];
473 if (thisboard->do_nchan) {
474 s->type = COMEDI_SUBD_DO;
475 s->subdev_flags = SDF_WRITABLE;
476 s->n_chan = thisboard->do_nchan;
478 s->range_table = &range_digital;
480 thisboard->is_jr ? das08jr_do_wbits : das08_do_wbits;
482 s->type = COMEDI_SUBD_UNUSED;
485 s = &dev->subdevices[4];
487 if (thisboard->i8255_offset != 0) {
488 ret = subdev_8255_init(dev, s, NULL, thisboard->i8255_offset);
492 s->type = COMEDI_SUBD_UNUSED;
495 /* Counter subdevice (8254) */
496 s = &dev->subdevices[5];
497 if (thisboard->i8254_offset) {
498 dev->pacer = comedi_8254_init(dev->iobase +
499 thisboard->i8254_offset,
504 comedi_8254_subdevice_init(s, dev->pacer);
506 s->type = COMEDI_SUBD_UNUSED;
511 EXPORT_SYMBOL_GPL(das08_common_attach);
513 static int __init das08_init(void)
517 module_init(das08_init);
519 static void __exit das08_exit(void)
522 module_exit(das08_exit);
524 MODULE_AUTHOR("Comedi http://www.comedi.org");
525 MODULE_DESCRIPTION("Comedi low-level driver");
526 MODULE_LICENSE("GPL");