1 // SPDX-License-Identifier: GPL-2.0+
3 * comedi/drivers/das08.c
4 * comedi module for common DAS08 support (used by ISA/PCI/PCMCIA drivers)
6 * COMEDI - Linux Control and Measurement Device Interface
7 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
8 * Copyright (C) 2001,2002,2003 Frank Mori Hess <fmhess@users.sourceforge.net>
9 * Copyright (C) 2004 Salvador E. Tropea <set@users.sf.net> <set@ieee.org>
12 #include <linux/module.h>
13 #include <linux/comedi/comedidev.h>
14 #include <linux/comedi/comedi_8255.h>
15 #include <linux/comedi/comedi_8254.h>
20 * Data format of DAS08_AI_LSB_REG and DAS08_AI_MSB_REG depends on
21 * 'ai_encoding' member of board structure:
23 * das08_encode12 : DATA[11..4] = MSB[7..0], DATA[3..0] = LSB[7..4].
24 * das08_pcm_encode12 : DATA[11..8] = MSB[3..0], DATA[7..9] = LSB[7..0].
25 * das08_encode16 : SIGN = MSB[7], MAGNITUDE[14..8] = MSB[6..0],
26 * MAGNITUDE[7..0] = LSB[7..0].
27 * SIGN==0 for negative input, SIGN==1 for positive input.
28 * Note: when read a second time after conversion
29 * complete, MSB[7] is an "over-range" bit.
31 #define DAS08_AI_LSB_REG 0x00 /* (R) AI least significant bits */
32 #define DAS08_AI_MSB_REG 0x01 /* (R) AI most significant bits */
33 #define DAS08_AI_TRIG_REG 0x01 /* (W) AI software trigger */
34 #define DAS08_STATUS_REG 0x02 /* (R) status */
35 #define DAS08_STATUS_AI_BUSY BIT(7) /* AI conversion in progress */
37 * The IRQ status bit is set to 1 by a rising edge on the external interrupt
38 * input (which may be jumpered to the pacer output). It is cleared by
39 * setting the INTE control bit to 0. Not present on "JR" boards.
41 #define DAS08_STATUS_IRQ BIT(3) /* latched interrupt input */
42 /* digital inputs (not "JR" boards) */
43 #define DAS08_STATUS_DI(x) (((x) & 0x70) >> 4)
44 #define DAS08_CONTROL_REG 0x02 /* (W) control */
46 * Note: The AI multiplexor channel can also be read from status register using
49 #define DAS08_CONTROL_MUX_MASK 0x7 /* multiplexor channel mask */
50 #define DAS08_CONTROL_MUX(x) ((x) & DAS08_CONTROL_MUX_MASK) /* mux channel */
51 #define DAS08_CONTROL_INTE BIT(3) /* interrupt enable (not "JR" boards) */
52 #define DAS08_CONTROL_DO_MASK 0xf0 /* digital outputs mask (not "JR") */
53 /* digital outputs (not "JR" boards) */
54 #define DAS08_CONTROL_DO(x) (((x) << 4) & DAS08_CONTROL_DO_MASK)
56 * (R/W) programmable AI gain ("PGx" and "AOx" boards):
57 * + bits 3..0 (R/W) show/set the gain for the current AI mux channel
58 * + bits 6..4 (R) show the current AI mux channel
59 * + bit 7 (R) not unused
61 #define DAS08_GAIN_REG 0x03
63 #define DAS08JR_DI_REG 0x03 /* (R) digital inputs ("JR" boards) */
64 #define DAS08JR_DO_REG 0x03 /* (W) digital outputs ("JR" boards) */
65 /* (W) analog output l.s.b. registers for 2 channels ("JR" boards) */
66 #define DAS08JR_AO_LSB_REG(x) ((x) ? 0x06 : 0x04)
67 /* (W) analog output m.s.b. registers for 2 channels ("JR" boards) */
68 #define DAS08JR_AO_MSB_REG(x) ((x) ? 0x07 : 0x05)
70 * (R) update analog outputs ("JR" boards set for simultaneous output)
71 * (same register as digital inputs)
73 #define DAS08JR_AO_UPDATE_REG 0x03
75 /* (W) analog output l.s.b. registers for 2 channels ("AOx" boards) */
76 #define DAS08AOX_AO_LSB_REG(x) ((x) ? 0x0a : 0x08)
77 /* (W) analog output m.s.b. registers for 2 channels ("AOx" boards) */
78 #define DAS08AOX_AO_MSB_REG(x) ((x) ? 0x0b : 0x09)
80 * (R) update analog outputs ("AOx" boards set for simultaneous output)
81 * (any of the analog output registers could be used for this)
83 #define DAS08AOX_AO_UPDATE_REG 0x08
85 /* gainlist same as _pgx_ below */
87 static const struct comedi_lrange das08_pgl_ai_range = {
101 static const struct comedi_lrange das08_pgh_ai_range = {
118 static const struct comedi_lrange das08_pgm_ai_range = {
132 static const struct comedi_lrange *const das08_ai_lranges[] = {
133 [das08_pg_none] = &range_unknown,
134 [das08_bipolar5] = &range_bipolar5,
135 [das08_pgh] = &das08_pgh_ai_range,
136 [das08_pgl] = &das08_pgl_ai_range,
137 [das08_pgm] = &das08_pgm_ai_range,
140 static const int das08_pgh_ai_gainlist[] = {
141 8, 0, 10, 2, 12, 4, 14, 6, 1, 3, 5, 7
143 static const int das08_pgl_ai_gainlist[] = { 8, 0, 2, 4, 6, 1, 3, 5, 7 };
144 static const int das08_pgm_ai_gainlist[] = { 8, 0, 10, 12, 14, 9, 11, 13, 15 };
146 static const int *const das08_ai_gainlists[] = {
147 [das08_pg_none] = NULL,
148 [das08_bipolar5] = NULL,
149 [das08_pgh] = das08_pgh_ai_gainlist,
150 [das08_pgl] = das08_pgl_ai_gainlist,
151 [das08_pgm] = das08_pgm_ai_gainlist,
154 static int das08_ai_eoc(struct comedi_device *dev,
155 struct comedi_subdevice *s,
156 struct comedi_insn *insn,
157 unsigned long context)
161 status = inb(dev->iobase + DAS08_STATUS_REG);
162 if ((status & DAS08_STATUS_AI_BUSY) == 0)
167 static int das08_ai_insn_read(struct comedi_device *dev,
168 struct comedi_subdevice *s,
169 struct comedi_insn *insn, unsigned int *data)
171 const struct das08_board_struct *board = dev->board_ptr;
172 struct das08_private_struct *devpriv = dev->private;
179 chan = CR_CHAN(insn->chanspec);
180 range = CR_RANGE(insn->chanspec);
183 inb(dev->iobase + DAS08_AI_LSB_REG);
184 inb(dev->iobase + DAS08_AI_MSB_REG);
186 /* set multiplexer */
187 /* lock to prevent race with digital output */
188 spin_lock(&dev->spinlock);
189 devpriv->do_mux_bits &= ~DAS08_CONTROL_MUX_MASK;
190 devpriv->do_mux_bits |= DAS08_CONTROL_MUX(chan);
191 outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
192 spin_unlock(&dev->spinlock);
194 if (devpriv->pg_gainlist) {
196 range = CR_RANGE(insn->chanspec);
197 outb(devpriv->pg_gainlist[range],
198 dev->iobase + DAS08_GAIN_REG);
201 for (n = 0; n < insn->n; n++) {
202 /* clear over-range bits for 16-bit boards */
203 if (board->ai_nbits == 16)
204 if (inb(dev->iobase + DAS08_AI_MSB_REG) & 0x80)
205 dev_info(dev->class_dev, "over-range\n");
207 /* trigger conversion */
208 outb_p(0, dev->iobase + DAS08_AI_TRIG_REG);
210 ret = comedi_timeout(dev, s, insn, das08_ai_eoc, 0);
214 msb = inb(dev->iobase + DAS08_AI_MSB_REG);
215 lsb = inb(dev->iobase + DAS08_AI_LSB_REG);
216 if (board->ai_encoding == das08_encode12) {
217 data[n] = (lsb >> 4) | (msb << 4);
218 } else if (board->ai_encoding == das08_pcm_encode12) {
219 data[n] = (msb << 8) + lsb;
220 } else if (board->ai_encoding == das08_encode16) {
222 * "JR" 16-bit boards are sign-magnitude.
224 * XXX The manual seems to imply that 0 is full-scale
225 * negative and 65535 is full-scale positive, but the
226 * original COMEDI patch to add support for the
227 * DAS08/JR/16 and DAS08/JR/16-AO boards have it
228 * encoded as sign-magnitude. Assume the original
229 * COMEDI code is correct for now.
231 unsigned int magnitude = lsb | ((msb & 0x7f) << 8);
234 * MSB bit 7 is 0 for negative, 1 for positive voltage.
235 * COMEDI 16-bit bipolar data value for 0V is 0x8000.
238 data[n] = BIT(15) + magnitude;
240 data[n] = BIT(15) - magnitude;
242 dev_err(dev->class_dev, "bug! unknown ai encoding\n");
250 static int das08_di_insn_bits(struct comedi_device *dev,
251 struct comedi_subdevice *s,
252 struct comedi_insn *insn, unsigned int *data)
255 data[1] = DAS08_STATUS_DI(inb(dev->iobase + DAS08_STATUS_REG));
260 static int das08_do_insn_bits(struct comedi_device *dev,
261 struct comedi_subdevice *s,
262 struct comedi_insn *insn, unsigned int *data)
264 struct das08_private_struct *devpriv = dev->private;
266 if (comedi_dio_update_state(s, data)) {
267 /* prevent race with setting of analog input mux */
268 spin_lock(&dev->spinlock);
269 devpriv->do_mux_bits &= ~DAS08_CONTROL_DO_MASK;
270 devpriv->do_mux_bits |= DAS08_CONTROL_DO(s->state);
271 outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
272 spin_unlock(&dev->spinlock);
280 static int das08jr_di_insn_bits(struct comedi_device *dev,
281 struct comedi_subdevice *s,
282 struct comedi_insn *insn, unsigned int *data)
285 data[1] = inb(dev->iobase + DAS08JR_DI_REG);
290 static int das08jr_do_insn_bits(struct comedi_device *dev,
291 struct comedi_subdevice *s,
292 struct comedi_insn *insn, unsigned int *data)
294 if (comedi_dio_update_state(s, data))
295 outb(s->state, dev->iobase + DAS08JR_DO_REG);
302 static void das08_ao_set_data(struct comedi_device *dev,
303 unsigned int chan, unsigned int data)
305 const struct das08_board_struct *board = dev->board_ptr;
310 msb = (data >> 8) & 0xff;
312 outb(lsb, dev->iobase + DAS08JR_AO_LSB_REG(chan));
313 outb(msb, dev->iobase + DAS08JR_AO_MSB_REG(chan));
315 inb(dev->iobase + DAS08JR_AO_UPDATE_REG);
317 outb(lsb, dev->iobase + DAS08AOX_AO_LSB_REG(chan));
318 outb(msb, dev->iobase + DAS08AOX_AO_MSB_REG(chan));
320 inb(dev->iobase + DAS08AOX_AO_UPDATE_REG);
324 static int das08_ao_insn_write(struct comedi_device *dev,
325 struct comedi_subdevice *s,
326 struct comedi_insn *insn,
329 unsigned int chan = CR_CHAN(insn->chanspec);
330 unsigned int val = s->readback[chan];
333 for (i = 0; i < insn->n; i++) {
335 das08_ao_set_data(dev, chan, val);
337 s->readback[chan] = val;
342 int das08_common_attach(struct comedi_device *dev, unsigned long iobase)
344 const struct das08_board_struct *board = dev->board_ptr;
345 struct das08_private_struct *devpriv = dev->private;
346 struct comedi_subdevice *s;
350 dev->iobase = iobase;
352 dev->board_name = board->name;
354 ret = comedi_alloc_subdevices(dev, 6);
358 s = &dev->subdevices[0];
360 if (board->ai_nbits) {
361 s->type = COMEDI_SUBD_AI;
363 * XXX some boards actually have differential
364 * inputs instead of single ended.
365 * The driver does nothing with arefs though,
366 * so it's no big deal.
368 s->subdev_flags = SDF_READABLE | SDF_GROUND;
370 s->maxdata = (1 << board->ai_nbits) - 1;
371 s->range_table = das08_ai_lranges[board->ai_pg];
372 s->insn_read = das08_ai_insn_read;
373 devpriv->pg_gainlist = das08_ai_gainlists[board->ai_pg];
375 s->type = COMEDI_SUBD_UNUSED;
378 s = &dev->subdevices[1];
380 if (board->ao_nbits) {
381 s->type = COMEDI_SUBD_AO;
382 s->subdev_flags = SDF_WRITABLE;
384 s->maxdata = (1 << board->ao_nbits) - 1;
385 s->range_table = &range_bipolar5;
386 s->insn_write = das08_ao_insn_write;
388 ret = comedi_alloc_subdev_readback(s);
392 /* initialize all channels to 0V */
393 for (i = 0; i < s->n_chan; i++) {
394 s->readback[i] = s->maxdata / 2;
395 das08_ao_set_data(dev, i, s->readback[i]);
398 s->type = COMEDI_SUBD_UNUSED;
401 s = &dev->subdevices[2];
403 if (board->di_nchan) {
404 s->type = COMEDI_SUBD_DI;
405 s->subdev_flags = SDF_READABLE;
406 s->n_chan = board->di_nchan;
408 s->range_table = &range_digital;
409 s->insn_bits = board->is_jr ? das08jr_di_insn_bits :
412 s->type = COMEDI_SUBD_UNUSED;
415 s = &dev->subdevices[3];
417 if (board->do_nchan) {
418 s->type = COMEDI_SUBD_DO;
419 s->subdev_flags = SDF_WRITABLE;
420 s->n_chan = board->do_nchan;
422 s->range_table = &range_digital;
423 s->insn_bits = board->is_jr ? das08jr_do_insn_bits :
426 s->type = COMEDI_SUBD_UNUSED;
429 s = &dev->subdevices[4];
431 if (board->i8255_offset != 0) {
432 ret = subdev_8255_io_init(dev, s, board->i8255_offset);
436 s->type = COMEDI_SUBD_UNUSED;
439 /* Counter subdevice (8254) */
440 s = &dev->subdevices[5];
441 if (board->i8254_offset) {
443 comedi_8254_io_alloc(dev->iobase + board->i8254_offset,
445 if (IS_ERR(dev->pacer))
446 return PTR_ERR(dev->pacer);
448 comedi_8254_subdevice_init(s, dev->pacer);
450 s->type = COMEDI_SUBD_UNUSED;
455 EXPORT_SYMBOL_GPL(das08_common_attach);
457 static int __init das08_init(void)
461 module_init(das08_init);
463 static void __exit das08_exit(void)
466 module_exit(das08_exit);
468 MODULE_AUTHOR("Comedi https://www.comedi.org");
469 MODULE_DESCRIPTION("Comedi common DAS08 support module");
470 MODULE_LICENSE("GPL");