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_DO_MASK 0xf0
79 #define DAS08_OP(x) (((x) << 4) & DAS08_DO_MASK)
87 1 a/d bits 4-11 start 12 bit
98 #define DAS08JR_AO_LSB(x) ((x) ? 6 : 4)
99 #define DAS08JR_AO_MSB(x) ((x) ? 7 : 5)
108 0 a/d bits 0-3 start 8 bit
109 1 a/d bits 4-11 start 12 bit
110 2 eoc, ip1-3, irq, mux op1-4, inte, mux
111 3 mux, gain status gain control
121 #define DAS08AO_GAIN_CONTROL 3
122 #define DAS08AO_GAIN_STATUS 3
124 #define DAS08AO_AO_LSB(x) ((x) ? 0xa : 8)
125 #define DAS08AO_AO_MSB(x) ((x) ? 0xb : 9)
126 #define DAS08AO_AO_UPDATE 8
128 /* gainlist same as _pgx_ below */
130 static const struct comedi_lrange range_das08_pgl = {
144 static const struct comedi_lrange range_das08_pgh = {
161 static const struct comedi_lrange range_das08_pgm = {
178 0 a/d bits 0-3 unused
179 1 a/d bits 4-11 start 12 bit
189 static const struct comedi_lrange *const das08_ai_lranges[] = {
190 [das08_pg_none] = &range_unknown,
191 [das08_bipolar5] = &range_bipolar5,
192 [das08_pgh] = &range_das08_pgh,
193 [das08_pgl] = &range_das08_pgl,
194 [das08_pgm] = &range_das08_pgm,
197 static const int das08_pgh_gainlist[] = {
198 8, 0, 10, 2, 12, 4, 14, 6, 1, 3, 5, 7
200 static const int das08_pgl_gainlist[] = { 8, 0, 2, 4, 6, 1, 3, 5, 7 };
201 static const int das08_pgm_gainlist[] = { 8, 0, 10, 12, 14, 9, 11, 13, 15 };
203 static const int *const das08_gainlists[] = {
204 [das08_pg_none] = NULL,
205 [das08_bipolar5] = NULL,
206 [das08_pgh] = das08_pgh_gainlist,
207 [das08_pgl] = das08_pgl_gainlist,
208 [das08_pgm] = das08_pgm_gainlist,
211 static int das08_ai_eoc(struct comedi_device *dev,
212 struct comedi_subdevice *s,
213 struct comedi_insn *insn,
214 unsigned long context)
218 status = inb(dev->iobase + DAS08_STATUS_REG);
219 if ((status & DAS08_STATUS_AI_BUSY) == 0)
224 static int das08_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
225 struct comedi_insn *insn, unsigned int *data)
227 const struct das08_board_struct *thisboard = dev->board_ptr;
228 struct das08_private_struct *devpriv = dev->private;
235 chan = CR_CHAN(insn->chanspec);
236 range = CR_RANGE(insn->chanspec);
239 inb(dev->iobase + DAS08_AI_LSB_REG);
240 inb(dev->iobase + DAS08_AI_MSB_REG);
242 /* set multiplexer */
243 /* lock to prevent race with digital output */
244 spin_lock(&dev->spinlock);
245 devpriv->do_mux_bits &= ~DAS08_CONTROL_MUX_MASK;
246 devpriv->do_mux_bits |= DAS08_CONTROL_MUX(chan);
247 outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
248 spin_unlock(&dev->spinlock);
250 if (devpriv->pg_gainlist) {
252 range = CR_RANGE(insn->chanspec);
253 outb(devpriv->pg_gainlist[range],
254 dev->iobase + DAS08AO_GAIN_CONTROL);
257 for (n = 0; n < insn->n; n++) {
258 /* clear over-range bits for 16-bit boards */
259 if (thisboard->ai_nbits == 16)
260 if (inb(dev->iobase + DAS08_AI_MSB_REG) & 0x80)
261 dev_info(dev->class_dev, "over-range\n");
263 /* trigger conversion */
264 outb_p(0, dev->iobase + DAS08_AI_TRIG_REG);
266 ret = comedi_timeout(dev, s, insn, das08_ai_eoc, 0);
270 msb = inb(dev->iobase + DAS08_AI_MSB_REG);
271 lsb = inb(dev->iobase + DAS08_AI_LSB_REG);
272 if (thisboard->ai_encoding == das08_encode12) {
273 data[n] = (lsb >> 4) | (msb << 4);
274 } else if (thisboard->ai_encoding == das08_pcm_encode12) {
275 data[n] = (msb << 8) + lsb;
276 } else if (thisboard->ai_encoding == das08_encode16) {
277 /* FPOS 16-bit boards are sign-magnitude */
279 data[n] = (1 << 15) | lsb | ((msb & 0x7f) << 8);
281 data[n] = (1 << 15) - (lsb | (msb & 0x7f) << 8);
283 dev_err(dev->class_dev, "bug! unknown ai encoding\n");
291 static int das08_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
292 struct comedi_insn *insn, unsigned int *data)
295 data[1] = DAS08_STATUS_DI(inb(dev->iobase + DAS08_STATUS_REG));
300 static int das08_do_wbits(struct comedi_device *dev,
301 struct comedi_subdevice *s,
302 struct comedi_insn *insn,
305 struct das08_private_struct *devpriv = dev->private;
307 if (comedi_dio_update_state(s, data)) {
308 /* prevent race with setting of analog input mux */
309 spin_lock(&dev->spinlock);
310 devpriv->do_mux_bits &= ~DAS08_DO_MASK;
311 devpriv->do_mux_bits |= DAS08_OP(s->state);
312 outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
313 spin_unlock(&dev->spinlock);
321 static int das08jr_di_rbits(struct comedi_device *dev,
322 struct comedi_subdevice *s,
323 struct comedi_insn *insn, unsigned int *data)
326 data[1] = inb(dev->iobase + DAS08JR_DIO);
331 static int das08jr_do_wbits(struct comedi_device *dev,
332 struct comedi_subdevice *s,
333 struct comedi_insn *insn,
336 if (comedi_dio_update_state(s, data))
337 outb(s->state, dev->iobase + DAS08JR_DIO);
344 static void das08_ao_set_data(struct comedi_device *dev,
345 unsigned int chan, unsigned int data)
347 const struct das08_board_struct *thisboard = dev->board_ptr;
352 msb = (data >> 8) & 0xff;
353 if (thisboard->is_jr) {
354 outb(lsb, dev->iobase + DAS08JR_AO_LSB(chan));
355 outb(msb, dev->iobase + DAS08JR_AO_MSB(chan));
357 inb(dev->iobase + DAS08JR_DIO);
359 outb(lsb, dev->iobase + DAS08AO_AO_LSB(chan));
360 outb(msb, dev->iobase + DAS08AO_AO_MSB(chan));
362 inb(dev->iobase + DAS08AO_AO_UPDATE);
366 static int das08_ao_insn_write(struct comedi_device *dev,
367 struct comedi_subdevice *s,
368 struct comedi_insn *insn,
371 unsigned int chan = CR_CHAN(insn->chanspec);
372 unsigned int val = s->readback[chan];
375 for (i = 0; i < insn->n; i++) {
377 das08_ao_set_data(dev, chan, val);
379 s->readback[chan] = val;
384 int das08_common_attach(struct comedi_device *dev, unsigned long iobase)
386 const struct das08_board_struct *thisboard = dev->board_ptr;
387 struct das08_private_struct *devpriv = dev->private;
388 struct comedi_subdevice *s;
392 dev->iobase = iobase;
394 dev->board_name = thisboard->name;
396 ret = comedi_alloc_subdevices(dev, 6);
400 s = &dev->subdevices[0];
402 if (thisboard->ai_nbits) {
403 s->type = COMEDI_SUBD_AI;
404 /* XXX some boards actually have differential
405 * inputs instead of single ended.
406 * The driver does nothing with arefs though,
407 * so it's no big deal.
409 s->subdev_flags = SDF_READABLE | SDF_GROUND;
411 s->maxdata = (1 << thisboard->ai_nbits) - 1;
412 s->range_table = das08_ai_lranges[thisboard->ai_pg];
413 s->insn_read = das08_ai_rinsn;
414 devpriv->pg_gainlist = das08_gainlists[thisboard->ai_pg];
416 s->type = COMEDI_SUBD_UNUSED;
419 s = &dev->subdevices[1];
421 if (thisboard->ao_nbits) {
422 s->type = COMEDI_SUBD_AO;
423 s->subdev_flags = SDF_WRITABLE;
425 s->maxdata = (1 << thisboard->ao_nbits) - 1;
426 s->range_table = &range_bipolar5;
427 s->insn_write = das08_ao_insn_write;
429 ret = comedi_alloc_subdev_readback(s);
433 /* initialize all channels to 0V */
434 for (i = 0; i < s->n_chan; i++) {
435 s->readback[i] = s->maxdata / 2;
436 das08_ao_set_data(dev, i, s->readback[i]);
439 s->type = COMEDI_SUBD_UNUSED;
442 s = &dev->subdevices[2];
444 if (thisboard->di_nchan) {
445 s->type = COMEDI_SUBD_DI;
446 s->subdev_flags = SDF_READABLE;
447 s->n_chan = thisboard->di_nchan;
449 s->range_table = &range_digital;
451 thisboard->is_jr ? das08jr_di_rbits : das08_di_rbits;
453 s->type = COMEDI_SUBD_UNUSED;
456 s = &dev->subdevices[3];
458 if (thisboard->do_nchan) {
459 s->type = COMEDI_SUBD_DO;
460 s->subdev_flags = SDF_WRITABLE;
461 s->n_chan = thisboard->do_nchan;
463 s->range_table = &range_digital;
465 thisboard->is_jr ? das08jr_do_wbits : das08_do_wbits;
467 s->type = COMEDI_SUBD_UNUSED;
470 s = &dev->subdevices[4];
472 if (thisboard->i8255_offset != 0) {
473 ret = subdev_8255_init(dev, s, NULL, thisboard->i8255_offset);
477 s->type = COMEDI_SUBD_UNUSED;
480 /* Counter subdevice (8254) */
481 s = &dev->subdevices[5];
482 if (thisboard->i8254_offset) {
483 dev->pacer = comedi_8254_init(dev->iobase +
484 thisboard->i8254_offset,
489 comedi_8254_subdevice_init(s, dev->pacer);
491 s->type = COMEDI_SUBD_UNUSED;
496 EXPORT_SYMBOL_GPL(das08_common_attach);
498 static int __init das08_init(void)
502 module_init(das08_init);
504 static void __exit das08_exit(void)
507 module_exit(das08_exit);
509 MODULE_AUTHOR("Comedi http://www.comedi.org");
510 MODULE_DESCRIPTION("Comedi low-level driver");
511 MODULE_LICENSE("GPL");