3 * Comedi driver for DAS6402 compatible boards
4 * Copyright(c) 2014 H Hartley Sweeten <hsweeten@visionengravers.com>
6 * Rewrite of an experimental driver by:
7 * Copyright (C) 1999 Oystein Svendsen <svendsen@pvv.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
22 * Description: Keithley Metrabyte DAS6402 (& compatibles)
23 * Devices: (Keithley Metrabyte) DAS6402-12 (das6402-12)
24 * (Keithley Metrabyte) DAS6402-16 (das6402-16)
25 * Author: H Hartley Sweeten <hsweeten@visionengravers.com>
26 * Updated: Fri, 14 Mar 2014 10:18:43 -0700
29 * Configuration Options:
30 * [0] - I/O base address
31 * [1] - IRQ (optional, needed for async command support)
34 #include <linux/module.h>
35 #include <linux/interrupt.h>
37 #include "../comedidev.h"
43 #define DAS6402_AI_DATA_REG 0x00
44 #define DAS6402_AI_MUX_REG 0x02
45 #define DAS6402_AI_MUX_LO(x) (((x) & 0x3f) << 0)
46 #define DAS6402_AI_MUX_HI(x) (((x) & 0x3f) << 8)
47 #define DAS6402_DI_DO_REG 0x03
48 #define DAS6402_AO_DATA_REG(x) (0x04 + ((x) * 2))
49 #define DAS6402_AO_LSB_REG(x) (0x04 + ((x) * 2))
50 #define DAS6402_AO_MSB_REG(x) (0x05 + ((x) * 2))
51 #define DAS6402_STATUS_REG 0x08
52 #define DAS6402_STATUS_FFNE (1 << 0)
53 #define DAS6402_STATUS_FHALF (1 << 1)
54 #define DAS6402_STATUS_FFULL (1 << 2)
55 #define DAS6402_STATUS_XINT (1 << 3)
56 #define DAS6402_STATUS_INT (1 << 4)
57 #define DAS6402_STATUS_XTRIG (1 << 5)
58 #define DAS6402_STATUS_INDGT (1 << 6)
59 #define DAS6402_STATUS_10MHZ (1 << 7)
60 #define DAS6402_STATUS_W_CLRINT (1 << 0)
61 #define DAS6402_STATUS_W_CLRXTR (1 << 1)
62 #define DAS6402_STATUS_W_CLRXIN (1 << 2)
63 #define DAS6402_STATUS_W_EXTEND (1 << 4)
64 #define DAS6402_STATUS_W_ARMED (1 << 5)
65 #define DAS6402_STATUS_W_POSTMODE (1 << 6)
66 #define DAS6402_STATUS_W_10MHZ (1 << 7)
67 #define DAS6402_CTRL_REG 0x09
68 #define DAS6402_CTRL_SOFT_TRIG (0 << 0)
69 #define DAS6402_CTRL_EXT_FALL_TRIG (1 << 0)
70 #define DAS6402_CTRL_EXT_RISE_TRIG (2 << 0)
71 #define DAS6402_CTRL_PACER_TRIG (3 << 0)
72 #define DAS6402_CTRL_BURSTEN (1 << 2)
73 #define DAS6402_CTRL_XINTE (1 << 3)
74 #define DAS6402_CTRL_IRQ(x) ((x) << 4)
75 #define DAS6402_CTRL_INTE (1 << 7)
76 #define DAS6402_TRIG_REG 0x0a
77 #define DAS6402_TRIG_TGEN (1 << 0)
78 #define DAS6402_TRIG_TGSEL (1 << 1)
79 #define DAS6402_TRIG_TGPOL (1 << 2)
80 #define DAS6402_TRIG_PRETRIG (1 << 3)
81 #define DAS6402_AO_RANGE(_chan, _range) ((_range) << ((_chan) ? 6 : 4))
82 #define DAS6402_AO_RANGE_MASK(_chan) (3 << ((_chan) ? 6 : 4))
83 #define DAS6402_MODE_REG 0x0b
84 #define DAS6402_MODE_RANGE(x) ((x) << 0)
85 #define DAS6402_MODE_POLLED (0 << 2)
86 #define DAS6402_MODE_FIFONEPTY (1 << 2)
87 #define DAS6402_MODE_FIFOHFULL (2 << 2)
88 #define DAS6402_MODE_EOB (3 << 2)
89 #define DAS6402_MODE_ENHANCED (1 << 4)
90 #define DAS6402_MODE_SE (1 << 5)
91 #define DAS6402_MODE_UNI (1 << 6)
92 #define DAS6402_MODE_DMA1 (0 << 7)
93 #define DAS6402_MODE_DMA3 (1 << 7)
94 #define DAS6402_TIMER_BASE 0x0c
96 static const struct comedi_lrange das6402_ai_ranges = {
110 * Analog output ranges are programmable on the DAS6402/12.
111 * For the DAS6402/16 the range bits have no function, the
112 * DAC ranges are selected by switches on the board.
114 static const struct comedi_lrange das6402_ao_ranges = {
123 struct das6402_boardinfo {
125 unsigned int maxdata;
128 static struct das6402_boardinfo das6402_boards[] = {
130 .name = "das6402-12",
133 .name = "das6402-16",
138 struct das6402_private {
142 unsigned int divider1;
143 unsigned int divider2;
145 unsigned int ao_range;
146 unsigned int ao_readback[2];
149 static void das6402_set_mode(struct comedi_device *dev,
152 outb(DAS6402_MODE_ENHANCED | mode, dev->iobase + DAS6402_MODE_REG);
155 static void das6402_set_extended(struct comedi_device *dev,
158 outb(DAS6402_STATUS_W_EXTEND, dev->iobase + DAS6402_STATUS_REG);
159 outb(DAS6402_STATUS_W_EXTEND | val, dev->iobase + DAS6402_STATUS_REG);
160 outb(val, dev->iobase + DAS6402_STATUS_REG);
163 static void das6402_clear_all_interrupts(struct comedi_device *dev)
165 outb(DAS6402_STATUS_W_CLRINT |
166 DAS6402_STATUS_W_CLRXTR |
167 DAS6402_STATUS_W_CLRXIN, dev->iobase + DAS6402_STATUS_REG);
170 static void das6402_ai_clear_eoc(struct comedi_device *dev)
172 outb(DAS6402_STATUS_W_CLRINT, dev->iobase + DAS6402_STATUS_REG);
175 static void das6402_enable_counter(struct comedi_device *dev, bool load)
177 struct das6402_private *devpriv = dev->private;
178 unsigned long timer_iobase = dev->iobase + DAS6402_TIMER_BASE;
181 i8254_set_mode(timer_iobase, 0, 0, I8254_MODE0 | I8254_BINARY);
182 i8254_set_mode(timer_iobase, 0, 1, I8254_MODE2 | I8254_BINARY);
183 i8254_set_mode(timer_iobase, 0, 2, I8254_MODE2 | I8254_BINARY);
185 i8254_write(timer_iobase, 0, 0, devpriv->count);
186 i8254_write(timer_iobase, 0, 1, devpriv->divider1);
187 i8254_write(timer_iobase, 0, 2, devpriv->divider2);
190 i8254_set_mode(timer_iobase, 0, 0, I8254_MODE0 | I8254_BINARY);
191 i8254_set_mode(timer_iobase, 0, 1, I8254_MODE0 | I8254_BINARY);
192 i8254_set_mode(timer_iobase, 0, 2, I8254_MODE0 | I8254_BINARY);
196 static irqreturn_t das6402_interrupt(int irq, void *d)
198 struct comedi_device *dev = d;
200 das6402_clear_all_interrupts(dev);
205 static int das6402_ai_cmd(struct comedi_device *dev,
206 struct comedi_subdevice *s)
211 static int das6402_ai_cmdtest(struct comedi_device *dev,
212 struct comedi_subdevice *s,
213 struct comedi_cmd *cmd)
218 static int das6402_ai_cancel(struct comedi_device *dev,
219 struct comedi_subdevice *s)
221 outb(DAS6402_CTRL_SOFT_TRIG, dev->iobase + DAS6402_CTRL_REG);
226 static void das6402_ai_soft_trig(struct comedi_device *dev)
228 outw(0, dev->iobase + DAS6402_AI_DATA_REG);
231 static int das6402_ai_eoc(struct comedi_device *dev,
232 struct comedi_subdevice *s,
233 struct comedi_insn *insn,
234 unsigned long context)
238 status = inb(dev->iobase + DAS6402_STATUS_REG);
239 if (status & DAS6402_STATUS_FFNE)
244 static int das6402_ai_insn_read(struct comedi_device *dev,
245 struct comedi_subdevice *s,
246 struct comedi_insn *insn,
249 unsigned int chan = CR_CHAN(insn->chanspec);
250 unsigned int range = CR_RANGE(insn->chanspec);
251 unsigned int aref = CR_AREF(insn->chanspec);
256 val = DAS6402_MODE_RANGE(range) | DAS6402_MODE_POLLED;
257 if (aref == AREF_DIFF) {
258 if (chan > s->n_chan / 2)
261 val |= DAS6402_MODE_SE;
263 if (comedi_range_is_unipolar(s, range))
264 val |= DAS6402_MODE_UNI;
266 /* enable software conversion trigger */
267 outb(DAS6402_CTRL_SOFT_TRIG, dev->iobase + DAS6402_CTRL_REG);
269 das6402_set_mode(dev, val);
271 /* load the mux for single channel conversion */
272 outw(DAS6402_AI_MUX_HI(chan) | DAS6402_AI_MUX_LO(chan),
273 dev->iobase + DAS6402_AI_MUX_REG);
275 for (i = 0; i < insn->n; i++) {
276 das6402_ai_clear_eoc(dev);
277 das6402_ai_soft_trig(dev);
279 ret = comedi_timeout(dev, s, insn, das6402_ai_eoc, 0);
283 val = inw(dev->iobase + DAS6402_AI_DATA_REG);
285 if (s->maxdata == 0x0fff)
291 das6402_ai_clear_eoc(dev);
296 static int das6402_ao_insn_write(struct comedi_device *dev,
297 struct comedi_subdevice *s,
298 struct comedi_insn *insn,
301 struct das6402_private *devpriv = dev->private;
302 unsigned int chan = CR_CHAN(insn->chanspec);
303 unsigned int range = CR_RANGE(insn->chanspec);
307 /* set the range for this channel */
308 val = devpriv->ao_range;
309 val &= ~DAS6402_AO_RANGE_MASK(chan);
310 val |= DAS6402_AO_RANGE(chan, range);
311 if (val != devpriv->ao_range) {
312 devpriv->ao_range = val;
313 outb(val, dev->iobase + DAS6402_TRIG_REG);
317 * The DAS6402/16 has a jumper to select either individual
318 * update (UPDATE) or simultaneous updating (XFER) of both
319 * DAC's. In UPDATE mode, when the MSB is written, that DAC
320 * is updated. In XFER mode, after both DAC's are loaded,
321 * a read cycle of any DAC register will update both DAC's
324 * If you have XFER mode enabled a (*insn_read) will need
325 * to be performed in order to update the DAC's with the
326 * last value written.
328 for (i = 0; i < insn->n; i++) {
331 devpriv->ao_readback[chan] = val;
333 if (s->maxdata == 0x0fff) {
335 * DAS6402/12 has the two 8-bit DAC registers, left
336 * justified (the 4 LSB bits are don't care). Data
337 * can be written as one word.
340 outw(val, dev->iobase + DAS6402_AO_DATA_REG(chan));
343 * DAS6402/16 uses both 8-bit DAC registers and needs
344 * to be written LSB then MSB.
347 dev->iobase + DAS6402_AO_LSB_REG(chan));
348 outb((val >> 8) & 0xff,
349 dev->iobase + DAS6402_AO_LSB_REG(chan));
356 static int das6402_ao_insn_read(struct comedi_device *dev,
357 struct comedi_subdevice *s,
358 struct comedi_insn *insn,
361 struct das6402_private *devpriv = dev->private;
362 unsigned int chan = CR_CHAN(insn->chanspec);
366 * If XFER mode is enabled, reading any DAC register
367 * will update both DAC's simultaneously.
369 inw(dev->iobase + DAS6402_AO_LSB_REG(chan));
371 for (i = 0; i < insn->n; i++)
372 data[i] = devpriv->ao_readback[chan];
377 static int das6402_di_insn_bits(struct comedi_device *dev,
378 struct comedi_subdevice *s,
379 struct comedi_insn *insn,
382 data[1] = inb(dev->iobase + DAS6402_DI_DO_REG);
387 static int das6402_do_insn_bits(struct comedi_device *dev,
388 struct comedi_subdevice *s,
389 struct comedi_insn *insn,
392 if (comedi_dio_update_state(s, data))
393 outb(s->state, dev->iobase + DAS6402_DI_DO_REG);
400 static void das6402_reset(struct comedi_device *dev)
402 struct das6402_private *devpriv = dev->private;
404 /* enable "Enhanced" mode */
405 outb(DAS6402_MODE_ENHANCED, dev->iobase + DAS6402_MODE_REG);
407 /* enable 10MHz pacer clock */
408 das6402_set_extended(dev, DAS6402_STATUS_W_10MHZ);
410 /* enable software conversion trigger */
411 outb(DAS6402_CTRL_SOFT_TRIG, dev->iobase + DAS6402_CTRL_REG);
413 /* default ADC to single-ended unipolar 10V inputs */
414 das6402_set_mode(dev, DAS6402_MODE_RANGE(0) |
415 DAS6402_MODE_POLLED |
419 /* default mux for single channel conversion (channel 0) */
420 outw(DAS6402_AI_MUX_HI(0) | DAS6402_AI_MUX_LO(0),
421 dev->iobase + DAS6402_AI_MUX_REG);
423 /* set both DAC's for unipolar 5V output range */
424 devpriv->ao_range = DAS6402_AO_RANGE(0, 2) | DAS6402_AO_RANGE(1, 2);
425 outb(devpriv->ao_range, dev->iobase + DAS6402_TRIG_REG);
427 /* set both DAC's to 0V */
428 outw(0, dev->iobase + DAS6402_AO_DATA_REG(0));
429 outw(0, dev->iobase + DAS6402_AO_DATA_REG(0));
430 inw(dev->iobase + DAS6402_AO_LSB_REG(0));
432 das6402_enable_counter(dev, false);
434 /* set all digital outputs low */
435 outb(0, dev->iobase + DAS6402_DI_DO_REG);
437 das6402_clear_all_interrupts(dev);
440 static int das6402_attach(struct comedi_device *dev,
441 struct comedi_devconfig *it)
443 const struct das6402_boardinfo *board = comedi_board(dev);
444 struct das6402_private *devpriv;
445 struct comedi_subdevice *s;
448 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
452 ret = comedi_request_region(dev, it->options[0], 0x10);
458 /* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
459 if ((1 << it->options[1]) & 0x8cec) {
460 ret = request_irq(it->options[1], das6402_interrupt, 0,
461 dev->board_name, dev);
463 dev->irq = it->options[1];
476 devpriv->irq = dev->irq;
482 ret = comedi_alloc_subdevices(dev, 4);
486 /* Analog Input subdevice */
487 s = &dev->subdevices[0];
488 s->type = COMEDI_SUBD_AI;
489 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
491 s->maxdata = board->maxdata;
492 s->range_table = &das6402_ai_ranges;
493 s->insn_read = das6402_ai_insn_read;
495 dev->read_subdev = s;
496 s->subdev_flags |= SDF_CMD_READ;
497 s->len_chanlist = s->n_chan;
498 s->do_cmdtest = das6402_ai_cmdtest;
499 s->do_cmd = das6402_ai_cmd;
500 s->cancel = das6402_ai_cancel;
503 /* Analog Output subdevice */
504 s = &dev->subdevices[1];
505 s->type = COMEDI_SUBD_AO;
506 s->subdev_flags = SDF_WRITEABLE;
508 s->maxdata = board->maxdata;
509 s->range_table = &das6402_ao_ranges;
510 s->insn_write = das6402_ao_insn_write;
511 s->insn_read = das6402_ao_insn_read;
513 /* Digital Input subdevice */
514 s = &dev->subdevices[2];
515 s->type = COMEDI_SUBD_DI;
516 s->subdev_flags = SDF_READABLE;
519 s->range_table = &range_digital;
520 s->insn_bits = das6402_di_insn_bits;
522 /* Digital Input subdevice */
523 s = &dev->subdevices[3];
524 s->type = COMEDI_SUBD_DO;
525 s->subdev_flags = SDF_WRITEABLE;
528 s->range_table = &range_digital;
529 s->insn_bits = das6402_do_insn_bits;
534 static struct comedi_driver das6402_driver = {
535 .driver_name = "das6402",
536 .module = THIS_MODULE,
537 .attach = das6402_attach,
538 .detach = comedi_legacy_detach,
539 .board_name = &das6402_boards[0].name,
540 .num_names = ARRAY_SIZE(das6402_boards),
541 .offset = sizeof(struct das6402_boardinfo),
543 module_comedi_driver(das6402_driver)
545 MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
546 MODULE_DESCRIPTION("Comedi driver for DAS6402 compatible boards");
547 MODULE_LICENSE("GPL");