2 comedi/drivers/cb_pcidda.c
3 This intends to be a driver for the ComputerBoards / MeasurementComputing
6 Copyright (C) 2001 Ivan Martinez <ivanmr@altavista.com>
7 Copyright (C) 2001 Frank Mori Hess <fmhess@users.sourceforge.net>
9 COMEDI - Linux Control and Measurement Device Interface
10 Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 Description: MeasurementComputing PCI-DDA series
30 Author: Ivan Martinez <ivanmr@altavista.com>, Frank Mori Hess <fmhess@users.sourceforge.net>
31 Status: Supports 08/16, 04/16, 02/16, 08/12, 04/12, and 02/12
32 Devices: [Measurement Computing] PCI-DDA08/12 (cb_pcidda), PCI-DDA04/12,
33 PCI-DDA02/12, PCI-DDA08/16, PCI-DDA04/16, PCI-DDA02/16
35 Configuration options:
36 [0] - PCI bus of device (optional)
37 [1] - PCI slot of device (optional)
38 If bus/slot is not specified, the first available PCI
41 Only simple analog output writing is supported.
43 So far it has only been tested with:
45 Please report success/failure with other different cards to
49 #include "../comedidev.h"
51 #include "comedi_pci.h"
54 #define PCI_VENDOR_ID_CB 0x1307 /* PCI vendor number of ComputerBoards */
55 #define N_BOARDS 10 /* Number of boards in cb_pcidda_boards */
56 #define EEPROM_SIZE 128 /* number of entries in eeprom */
57 #define MAX_AO_CHANNELS 8 /* maximum number of ao channels for supported boards */
59 /* PCI-DDA base addresses */
60 #define DIGITALIO_BADRINDEX 2
61 /* DIGITAL I/O is pci_dev->resource[2] */
62 #define DIGITALIO_SIZE 8
63 /* DIGITAL I/O uses 8 I/O port addresses */
64 #define DAC_BADRINDEX 3
65 /* DAC is pci_dev->resource[3] */
67 /* Digital I/O registers */
68 #define PORT1A 0 /* PORT 1A DATA */
70 #define PORT1B 1 /* PORT 1B DATA */
72 #define PORT1C 2 /* PORT 1C DATA */
74 #define CONTROL1 3 /* CONTROL REGISTER 1 */
76 #define PORT2A 4 /* PORT 2A DATA */
78 #define PORT2B 5 /* PORT 2B DATA */
80 #define PORT2C 6 /* PORT 2C DATA */
82 #define CONTROL2 7 /* CONTROL REGISTER 2 */
85 #define DACONTROL 0 /* D/A CONTROL REGISTER */
86 #define SU 0000001 /* Simultaneous update enabled */
87 #define NOSU 0000000 /* Simultaneous update disabled */
88 #define ENABLEDAC 0000002 /* Enable specified DAC */
89 #define DISABLEDAC 0000000 /* Disable specified DAC */
90 #define RANGE2V5 0000000 /* 2.5V */
91 #define RANGE5V 0000200 /* 5V */
92 #define RANGE10V 0000300 /* 10V */
93 #define UNIP 0000400 /* Unipolar outputs */
94 #define BIP 0000000 /* Bipolar outputs */
96 #define DACALIBRATION1 4 /* D/A CALIBRATION REGISTER 1 */
98 #define SERIAL_IN_BIT 0x1 /* serial data input for eeprom, caldacs, reference dac */
99 #define CAL_CHANNEL_MASK (0x7 << 1)
100 #define CAL_CHANNEL_BITS(channel) (((channel) << 1) & CAL_CHANNEL_MASK)
102 #define CAL_COUNTER_MASK 0x1f
103 #define CAL_COUNTER_OVERFLOW_BIT 0x20 /* calibration counter overflow status bit */
104 #define AO_BELOW_REF_BIT 0x40 /* analog output is less than reference dac voltage */
105 #define SERIAL_OUT_BIT 0x80 /* serial data out, for reading from eeprom */
107 #define DACALIBRATION2 6 /* D/A CALIBRATION REGISTER 2 */
108 #define SELECT_EEPROM_BIT 0x1 /* send serial data in to eeprom */
109 #define DESELECT_REF_DAC_BIT 0x2 /* don't send serial data to MAX542 reference dac */
110 #define DESELECT_CALDAC_BIT(n) (0x4 << (n)) /* don't send serial data to caldac n */
111 #define DUMMY_BIT 0x40 /* manual says to set this bit with no explanation */
113 #define DADATA 8 /* FIRST D/A DATA REGISTER (0) */
115 static const struct comedi_lrange cb_pcidda_ranges = {
128 * Board descriptions for two imaginary boards. Describing the
129 * boards in this way is optional, and completely driver-dependent.
130 * Some drivers use arrays such as this, other do not.
132 struct cb_pcidda_board {
134 char status; /* Driver status: */
138 * 1 - manual read, not tested
139 * 2 - manual not read
142 unsigned short device_id;
145 const struct comedi_lrange *ranges;
148 static const struct cb_pcidda_board cb_pcidda_boards[] = {
150 name: "pci-dda02/12",
155 ranges: &cb_pcidda_ranges,
158 name: "pci-dda04/12",
163 ranges: &cb_pcidda_ranges,
166 name: "pci-dda08/12",
171 ranges: &cb_pcidda_ranges,
174 name: "pci-dda02/16",
179 ranges: &cb_pcidda_ranges,
182 name: "pci-dda04/16",
187 ranges: &cb_pcidda_ranges,
190 name: "pci-dda08/16",
195 ranges: &cb_pcidda_ranges,
199 static DEFINE_PCI_DEVICE_TABLE(cb_pcidda_pci_table) = {
200 {PCI_VENDOR_ID_CB, 0x0020, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
201 {PCI_VENDOR_ID_CB, 0x0021, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
202 {PCI_VENDOR_ID_CB, 0x0022, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
203 {PCI_VENDOR_ID_CB, 0x0023, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
204 {PCI_VENDOR_ID_CB, 0x0024, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
205 {PCI_VENDOR_ID_CB, 0x0025, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
209 MODULE_DEVICE_TABLE(pci, cb_pcidda_pci_table);
212 * Useful for shorthand access to the particular board structure
214 #define thisboard ((const struct cb_pcidda_board *)dev->board_ptr)
216 /* this structure is for data unique to this hardware driver. If
217 several hardware drivers keep similar information in this structure,
218 feel free to suggest moving the variable to the struct comedi_device struct. */
219 struct cb_pcidda_private {
222 /* would be useful for a PCI device */
223 struct pci_dev *pci_dev;
225 unsigned long digitalio;
228 /* unsigned long control_status; */
229 /* unsigned long adc_fifo; */
231 unsigned int dac_cal1_bits; /* bits last written to da calibration register 1 */
232 unsigned int ao_range[MAX_AO_CHANNELS]; /* current range settings for output channels */
233 u16 eeprom_data[EEPROM_SIZE]; /* software copy of board's eeprom */
237 * most drivers define the following macro to make it easy to
238 * access the private structure.
240 #define devpriv ((struct cb_pcidda_private *)dev->private)
242 static int cb_pcidda_attach(struct comedi_device * dev, struct comedi_devconfig * it);
243 static int cb_pcidda_detach(struct comedi_device * dev);
244 /* static int cb_pcidda_ai_rinsn(struct comedi_device *dev,struct comedi_subdevice *s,struct comedi_insn *insn,unsigned int *data); */
245 static int cb_pcidda_ao_winsn(struct comedi_device * dev, struct comedi_subdevice * s,
246 struct comedi_insn * insn, unsigned int * data);
248 /* static int cb_pcidda_ai_cmd(struct comedi_device *dev, struct *comedi_subdevice *s);*/
249 /* static int cb_pcidda_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd); */
250 /* static int cb_pcidda_ns_to_timer(unsigned int *ns,int *round); */
252 static unsigned int cb_pcidda_serial_in(struct comedi_device * dev);
253 static void cb_pcidda_serial_out(struct comedi_device * dev, unsigned int value,
254 unsigned int num_bits);
255 static unsigned int cb_pcidda_read_eeprom(struct comedi_device * dev,
256 unsigned int address);
257 static void cb_pcidda_calibrate(struct comedi_device * dev, unsigned int channel,
261 * The struct comedi_driver structure tells the Comedi core module
262 * which functions to call to configure/deconfigure (attach/detach)
263 * the board, and also about the kernel module that contains
266 static struct comedi_driver driver_cb_pcidda = {
267 driver_name:"cb_pcidda",
269 attach:cb_pcidda_attach,
270 detach:cb_pcidda_detach,
274 * Attach is called by the Comedi core to configure the driver
275 * for a particular board.
277 static int cb_pcidda_attach(struct comedi_device * dev, struct comedi_devconfig * it)
279 struct comedi_subdevice *s;
280 struct pci_dev *pcidev;
283 printk("comedi%d: cb_pcidda: ", dev->minor);
286 * Allocate the private structure area.
288 if (alloc_private(dev, sizeof(struct cb_pcidda_private)) < 0)
292 * Probe the device to determine what device in the series it is.
296 for (pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
298 pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pcidev)) {
299 if (pcidev->vendor == PCI_VENDOR_ID_CB) {
300 if (it->options[0] || it->options[1]) {
301 if (pcidev->bus->number != it->options[0] ||
302 PCI_SLOT(pcidev->devfn) !=
307 for (index = 0; index < N_BOARDS; index++) {
308 if (cb_pcidda_boards[index].device_id ==
316 printk("Not a ComputerBoards/MeasurementComputing card on requested position\n");
320 devpriv->pci_dev = pcidev;
321 dev->board_ptr = cb_pcidda_boards + index;
322 /* "thisboard" macro can be used from here. */
323 printk("Found %s at requested position\n", thisboard->name);
326 * Enable PCI device and request regions.
328 if (comedi_pci_enable(pcidev, thisboard->name)) {
329 printk("cb_pcidda: failed to enable PCI device and request regions\n");
334 * Allocate the I/O ports.
337 pci_resource_start(devpriv->pci_dev, DIGITALIO_BADRINDEX);
338 devpriv->dac = pci_resource_start(devpriv->pci_dev, DAC_BADRINDEX);
341 * Warn about the status of the driver.
343 if (thisboard->status == 2)
344 printk("WARNING: DRIVER FOR THIS BOARD NOT CHECKED WITH MANUAL. " "WORKS ASSUMING FULL COMPATIBILITY WITH PCI-DDA08/12. " "PLEASE REPORT USAGE TO <ivanmr@altavista.com>.\n");
347 * Initialize dev->board_name.
349 dev->board_name = thisboard->name;
352 * Allocate the subdevice structures.
354 if (alloc_subdevices(dev, 3) < 0)
357 s = dev->subdevices + 0;
358 /* analog output subdevice */
359 s->type = COMEDI_SUBD_AO;
360 s->subdev_flags = SDF_WRITABLE;
361 s->n_chan = thisboard->ao_chans;
362 s->maxdata = (1 << thisboard->ao_bits) - 1;
363 s->range_table = thisboard->ranges;
364 s->insn_write = cb_pcidda_ao_winsn;
366 /* s->subdev_flags |= SDF_CMD_READ; */
367 /* s->do_cmd = cb_pcidda_ai_cmd; */
368 /* s->do_cmdtest = cb_pcidda_ai_cmdtest; */
370 /* two 8255 digital io subdevices */
371 s = dev->subdevices + 1;
372 subdev_8255_init(dev, s, NULL, devpriv->digitalio);
373 s = dev->subdevices + 2;
374 subdev_8255_init(dev, s, NULL, devpriv->digitalio + PORT2A);
377 for (index = 0; index < EEPROM_SIZE; index++) {
378 devpriv->eeprom_data[index] = cb_pcidda_read_eeprom(dev, index);
379 printk(" %i:0x%x ", index, devpriv->eeprom_data[index]);
383 /* set calibrations dacs */
384 for (index = 0; index < thisboard->ao_chans; index++)
385 cb_pcidda_calibrate(dev, index, devpriv->ao_range[index]);
391 * _detach is called to deconfigure a device. It should deallocate
393 * This function is also called when _attach() fails, so it should be
394 * careful not to release resources that were not necessarily
395 * allocated by _attach(). dev->private and dev->subdevices are
396 * deallocated automatically by the core.
398 static int cb_pcidda_detach(struct comedi_device * dev)
401 * Deallocate the I/O ports.
404 if (devpriv->pci_dev) {
406 comedi_pci_disable(devpriv->pci_dev);
408 pci_dev_put(devpriv->pci_dev);
412 if (dev->subdevices) {
413 subdev_8255_cleanup(dev, dev->subdevices + 1);
414 subdev_8255_cleanup(dev, dev->subdevices + 2);
417 printk("comedi%d: cb_pcidda: remove\n", dev->minor);
423 * I will program this later... ;-)
426 static int cb_pcidda_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
428 printk("cb_pcidda_ai_cmd\n");
429 printk("subdev: %d\n", cmd->subdev);
430 printk("flags: %d\n", cmd->flags);
431 printk("start_src: %d\n", cmd->start_src);
432 printk("start_arg: %d\n", cmd->start_arg);
433 printk("scan_begin_src: %d\n", cmd->scan_begin_src);
434 printk("convert_src: %d\n", cmd->convert_src);
435 printk("convert_arg: %d\n", cmd->convert_arg);
436 printk("scan_end_src: %d\n", cmd->scan_end_src);
437 printk("scan_end_arg: %d\n", cmd->scan_end_arg);
438 printk("stop_src: %d\n", cmd->stop_src);
439 printk("stop_arg: %d\n", cmd->stop_arg);
440 printk("chanlist_len: %d\n", cmd->chanlist_len);
445 static int cb_pcidda_ai_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s,
446 struct comedi_cmd * cmd)
451 /* cmdtest tests a particular command to see if it is valid.
452 * Using the cmdtest ioctl, a user can create a valid cmd
453 * and then have it executes by the cmd ioctl.
455 * cmdtest returns 1,2,3,4 or 0, depending on which tests
456 * the command passes. */
458 /* step 1: make sure trigger sources are trivially valid */
460 tmp = cmd->start_src;
461 cmd->start_src &= TRIG_NOW;
462 if (!cmd->start_src || tmp != cmd->start_src)
465 tmp = cmd->scan_begin_src;
466 cmd->scan_begin_src &= TRIG_TIMER | TRIG_EXT;
467 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
470 tmp = cmd->convert_src;
471 cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
472 if (!cmd->convert_src || tmp != cmd->convert_src)
475 tmp = cmd->scan_end_src;
476 cmd->scan_end_src &= TRIG_COUNT;
477 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
481 cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
482 if (!cmd->stop_src || tmp != cmd->stop_src)
488 /* step 2: make sure trigger sources are unique and mutually compatible */
490 /* note that mutual compatiblity is not an issue here */
491 if (cmd->scan_begin_src != TRIG_TIMER
492 && cmd->scan_begin_src != TRIG_EXT)
494 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
496 if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
502 /* step 3: make sure arguments are trivially compatible */
504 if (cmd->start_arg != 0) {
508 #define MAX_SPEED 10000 /* in nanoseconds */
509 #define MIN_SPEED 1000000000 /* in nanoseconds */
511 if (cmd->scan_begin_src == TRIG_TIMER) {
512 if (cmd->scan_begin_arg < MAX_SPEED) {
513 cmd->scan_begin_arg = MAX_SPEED;
516 if (cmd->scan_begin_arg > MIN_SPEED) {
517 cmd->scan_begin_arg = MIN_SPEED;
521 /* external trigger */
522 /* should be level/edge, hi/lo specification here */
523 /* should specify multiple external triggers */
524 if (cmd->scan_begin_arg > 9) {
525 cmd->scan_begin_arg = 9;
529 if (cmd->convert_src == TRIG_TIMER) {
530 if (cmd->convert_arg < MAX_SPEED) {
531 cmd->convert_arg = MAX_SPEED;
534 if (cmd->convert_arg > MIN_SPEED) {
535 cmd->convert_arg = MIN_SPEED;
539 /* external trigger */
541 if (cmd->convert_arg > 9) {
542 cmd->convert_arg = 9;
547 if (cmd->scan_end_arg != cmd->chanlist_len) {
548 cmd->scan_end_arg = cmd->chanlist_len;
551 if (cmd->stop_src == TRIG_COUNT) {
552 if (cmd->stop_arg > 0x00ffffff) {
553 cmd->stop_arg = 0x00ffffff;
558 if (cmd->stop_arg != 0) {
567 /* step 4: fix up any arguments */
569 if (cmd->scan_begin_src == TRIG_TIMER) {
570 tmp = cmd->scan_begin_arg;
571 cb_pcidda_ns_to_timer(&cmd->scan_begin_arg,
572 cmd->flags & TRIG_ROUND_MASK);
573 if (tmp != cmd->scan_begin_arg)
576 if (cmd->convert_src == TRIG_TIMER) {
577 tmp = cmd->convert_arg;
578 cb_pcidda_ns_to_timer(&cmd->convert_arg,
579 cmd->flags & TRIG_ROUND_MASK);
580 if (tmp != cmd->convert_arg)
582 if (cmd->scan_begin_src == TRIG_TIMER &&
583 cmd->scan_begin_arg <
584 cmd->convert_arg * cmd->scan_end_arg) {
585 cmd->scan_begin_arg =
586 cmd->convert_arg * cmd->scan_end_arg;
598 /* This function doesn't require a particular form, this is just
599 * what happens to be used in some of the drivers. It should
600 * convert ns nanoseconds to a counter value suitable for programming
601 * the device. Also, it should adjust ns so that it cooresponds to
602 * the actual time that the device will use. */
604 static int cb_pcidda_ns_to_timer(unsigned int *ns, int round)
611 static int cb_pcidda_ao_winsn(struct comedi_device * dev, struct comedi_subdevice * s,
612 struct comedi_insn * insn, unsigned int * data)
614 unsigned int command;
615 unsigned int channel, range;
617 channel = CR_CHAN(insn->chanspec);
618 range = CR_RANGE(insn->chanspec);
620 /* adjust calibration dacs if range has changed */
621 if (range != devpriv->ao_range[channel])
622 cb_pcidda_calibrate(dev, channel, range);
624 /* output channel configuration */
625 command = NOSU | ENABLEDAC;
627 /* output channel range */
630 command |= BIP | RANGE10V;
633 command |= BIP | RANGE5V;
636 command |= BIP | RANGE2V5;
639 command |= UNIP | RANGE10V;
642 command |= UNIP | RANGE5V;
645 command |= UNIP | RANGE2V5;
649 /* output channel specification */
650 command |= channel << 2;
651 outw(command, devpriv->dac + DACONTROL);
654 outw(data[0], devpriv->dac + DADATA + channel * 2);
656 /* return the number of samples read/written */
660 /* lowlevel read from eeprom */
661 static unsigned int cb_pcidda_serial_in(struct comedi_device * dev)
663 unsigned int value = 0;
665 const int value_width = 16; /* number of bits wide values are */
667 for (i = 1; i <= value_width; i++) {
668 /* read bits most significant bit first */
669 if (inw_p(devpriv->dac + DACALIBRATION1) & SERIAL_OUT_BIT) {
670 value |= 1 << (value_width - i);
677 /* lowlevel write to eeprom/dac */
678 static void cb_pcidda_serial_out(struct comedi_device * dev, unsigned int value,
679 unsigned int num_bits)
683 for (i = 1; i <= num_bits; i++) {
684 /* send bits most significant bit first */
685 if (value & (1 << (num_bits - i)))
686 devpriv->dac_cal1_bits |= SERIAL_IN_BIT;
688 devpriv->dac_cal1_bits &= ~SERIAL_IN_BIT;
689 outw_p(devpriv->dac_cal1_bits, devpriv->dac + DACALIBRATION1);
693 /* reads a 16 bit value from board's eeprom */
694 static unsigned int cb_pcidda_read_eeprom(struct comedi_device * dev,
695 unsigned int address)
698 unsigned int cal2_bits;
700 const int max_num_caldacs = 4; /* one caldac for every two dac channels */
701 const int read_instruction = 0x6; /* bits to send to tell eeprom we want to read */
702 const int instruction_length = 3;
703 const int address_length = 8;
705 /* send serial output stream to eeprom */
706 cal2_bits = SELECT_EEPROM_BIT | DESELECT_REF_DAC_BIT | DUMMY_BIT;
707 /* deactivate caldacs (one caldac for every two channels) */
708 for (i = 0; i < max_num_caldacs; i++) {
709 cal2_bits |= DESELECT_CALDAC_BIT(i);
711 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
713 /* tell eeprom we want to read */
714 cb_pcidda_serial_out(dev, read_instruction, instruction_length);
715 /* send address we want to read from */
716 cb_pcidda_serial_out(dev, address, address_length);
718 value = cb_pcidda_serial_in(dev);
720 /* deactivate eeprom */
721 cal2_bits &= ~SELECT_EEPROM_BIT;
722 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
727 /* writes to 8 bit calibration dacs */
728 static void cb_pcidda_write_caldac(struct comedi_device * dev, unsigned int caldac,
729 unsigned int channel, unsigned int value)
731 unsigned int cal2_bits;
733 const int num_channel_bits = 3; /* caldacs use 3 bit channel specification */
734 const int num_caldac_bits = 8; /* 8 bit calibration dacs */
735 const int max_num_caldacs = 4; /* one caldac for every two dac channels */
737 /* write 3 bit channel */
738 cb_pcidda_serial_out(dev, channel, num_channel_bits);
739 /* write 8 bit caldac value */
740 cb_pcidda_serial_out(dev, value, num_caldac_bits);
743 * latch stream into appropriate caldac deselect reference dac
745 cal2_bits = DESELECT_REF_DAC_BIT | DUMMY_BIT;
746 /* deactivate caldacs (one caldac for every two channels) */
747 for (i = 0; i < max_num_caldacs; i++) {
748 cal2_bits |= DESELECT_CALDAC_BIT(i);
750 /* activate the caldac we want */
751 cal2_bits &= ~DESELECT_CALDAC_BIT(caldac);
752 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
753 /* deactivate caldac */
754 cal2_bits |= DESELECT_CALDAC_BIT(caldac);
755 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
758 /* returns caldac that calibrates given analog out channel */
759 static unsigned int caldac_number(unsigned int channel)
764 /* returns caldac channel that provides fine gain for given ao channel */
765 static unsigned int fine_gain_channel(unsigned int ao_channel)
767 return 4 * (ao_channel % 2);
770 /* returns caldac channel that provides coarse gain for given ao channel */
771 static unsigned int coarse_gain_channel(unsigned int ao_channel)
773 return 1 + 4 * (ao_channel % 2);
776 /* returns caldac channel that provides coarse offset for given ao channel */
777 static unsigned int coarse_offset_channel(unsigned int ao_channel)
779 return 2 + 4 * (ao_channel % 2);
782 /* returns caldac channel that provides fine offset for given ao channel */
783 static unsigned int fine_offset_channel(unsigned int ao_channel)
785 return 3 + 4 * (ao_channel % 2);
788 /* returns eeprom address that provides offset for given ao channel and range */
789 static unsigned int offset_eeprom_address(unsigned int ao_channel,
792 return 0x7 + 2 * range + 12 * ao_channel;
795 /* returns eeprom address that provides gain calibration for given ao channel and range */
796 static unsigned int gain_eeprom_address(unsigned int ao_channel,
799 return 0x8 + 2 * range + 12 * ao_channel;
802 /* returns upper byte of eeprom entry, which gives the coarse adjustment values */
803 static unsigned int eeprom_coarse_byte(unsigned int word)
805 return (word >> 8) & 0xff;
808 /* returns lower byte of eeprom entry, which gives the fine adjustment values */
809 static unsigned int eeprom_fine_byte(unsigned int word)
814 /* set caldacs to eeprom values for given channel and range */
815 static void cb_pcidda_calibrate(struct comedi_device * dev, unsigned int channel,
818 unsigned int coarse_offset, fine_offset, coarse_gain, fine_gain;
820 /* remember range so we can tell when we need to readjust calibration */
821 devpriv->ao_range[channel] = range;
823 /* get values from eeprom data */
825 eeprom_coarse_byte(devpriv->
826 eeprom_data[offset_eeprom_address(channel, range)]);
828 eeprom_fine_byte(devpriv->
829 eeprom_data[offset_eeprom_address(channel, range)]);
831 eeprom_coarse_byte(devpriv->
832 eeprom_data[gain_eeprom_address(channel, range)]);
834 eeprom_fine_byte(devpriv->
835 eeprom_data[gain_eeprom_address(channel, range)]);
838 cb_pcidda_write_caldac(dev, caldac_number(channel),
839 coarse_offset_channel(channel), coarse_offset);
840 cb_pcidda_write_caldac(dev, caldac_number(channel),
841 fine_offset_channel(channel), fine_offset);
842 cb_pcidda_write_caldac(dev, caldac_number(channel),
843 coarse_gain_channel(channel), coarse_gain);
844 cb_pcidda_write_caldac(dev, caldac_number(channel),
845 fine_gain_channel(channel), fine_gain);
849 * A convenient macro that defines init_module() and cleanup_module(),
852 COMEDI_PCI_INITCLEANUP(driver_cb_pcidda, cb_pcidda_pci_table);