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 EEPROM_SIZE 128 /* number of entries in eeprom */
56 #define MAX_AO_CHANNELS 8 /* maximum number of ao channels for supported boards */
58 /* PCI-DDA base addresses */
59 #define DIGITALIO_BADRINDEX 2
60 /* DIGITAL I/O is pci_dev->resource[2] */
61 #define DIGITALIO_SIZE 8
62 /* DIGITAL I/O uses 8 I/O port addresses */
63 #define DAC_BADRINDEX 3
64 /* DAC is pci_dev->resource[3] */
66 /* Digital I/O registers */
67 #define PORT1A 0 /* PORT 1A DATA */
69 #define PORT1B 1 /* PORT 1B DATA */
71 #define PORT1C 2 /* PORT 1C DATA */
73 #define CONTROL1 3 /* CONTROL REGISTER 1 */
75 #define PORT2A 4 /* PORT 2A DATA */
77 #define PORT2B 5 /* PORT 2B DATA */
79 #define PORT2C 6 /* PORT 2C DATA */
81 #define CONTROL2 7 /* CONTROL REGISTER 2 */
84 #define DACONTROL 0 /* D/A CONTROL REGISTER */
85 #define SU 0000001 /* Simultaneous update enabled */
86 #define NOSU 0000000 /* Simultaneous update disabled */
87 #define ENABLEDAC 0000002 /* Enable specified DAC */
88 #define DISABLEDAC 0000000 /* Disable specified DAC */
89 #define RANGE2V5 0000000 /* 2.5V */
90 #define RANGE5V 0000200 /* 5V */
91 #define RANGE10V 0000300 /* 10V */
92 #define UNIP 0000400 /* Unipolar outputs */
93 #define BIP 0000000 /* Bipolar outputs */
95 #define DACALIBRATION1 4 /* D/A CALIBRATION REGISTER 1 */
97 #define SERIAL_IN_BIT 0x1 /* serial data input for eeprom, caldacs, reference dac */
98 #define CAL_CHANNEL_MASK (0x7 << 1)
99 #define CAL_CHANNEL_BITS(channel) (((channel) << 1) & CAL_CHANNEL_MASK)
101 #define CAL_COUNTER_MASK 0x1f
102 #define CAL_COUNTER_OVERFLOW_BIT 0x20 /* calibration counter overflow status bit */
103 #define AO_BELOW_REF_BIT 0x40 /* analog output is less than reference dac voltage */
104 #define SERIAL_OUT_BIT 0x80 /* serial data out, for reading from eeprom */
106 #define DACALIBRATION2 6 /* D/A CALIBRATION REGISTER 2 */
107 #define SELECT_EEPROM_BIT 0x1 /* send serial data in to eeprom */
108 #define DESELECT_REF_DAC_BIT 0x2 /* don't send serial data to MAX542 reference dac */
109 #define DESELECT_CALDAC_BIT(n) (0x4 << (n)) /* don't send serial data to caldac n */
110 #define DUMMY_BIT 0x40 /* manual says to set this bit with no explanation */
112 #define DADATA 8 /* FIRST D/A DATA REGISTER (0) */
114 static const struct comedi_lrange cb_pcidda_ranges = {
127 * Board descriptions for two imaginary boards. Describing the
128 * boards in this way is optional, and completely driver-dependent.
129 * Some drivers use arrays such as this, other do not.
131 struct cb_pcidda_board {
133 char status; /* Driver status: */
137 * 1 - manual read, not tested
138 * 2 - manual not read
141 unsigned short device_id;
144 const struct comedi_lrange *ranges;
147 static const struct cb_pcidda_board cb_pcidda_boards[] = {
149 .name = "pci-dda02/12",
154 .ranges = &cb_pcidda_ranges,
157 .name = "pci-dda04/12",
162 .ranges = &cb_pcidda_ranges,
165 .name = "pci-dda08/12",
170 .ranges = &cb_pcidda_ranges,
173 .name = "pci-dda02/16",
178 .ranges = &cb_pcidda_ranges,
181 .name = "pci-dda04/16",
186 .ranges = &cb_pcidda_ranges,
189 .name = "pci-dda08/16",
194 .ranges = &cb_pcidda_ranges,
198 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,
243 struct comedi_devconfig *it);
244 static int cb_pcidda_detach(struct comedi_device *dev);
245 /* static int cb_pcidda_ai_rinsn(struct comedi_device *dev,struct comedi_subdevice *s,struct comedi_insn *insn,unsigned int *data); */
246 static int cb_pcidda_ao_winsn(struct comedi_device *dev,
247 struct comedi_subdevice *s,
248 struct comedi_insn *insn, unsigned int *data);
250 /* static int cb_pcidda_ai_cmd(struct comedi_device *dev, struct *comedi_subdevice *s);*/
251 /* static int cb_pcidda_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd); */
252 /* static int cb_pcidda_ns_to_timer(unsigned int *ns,int *round); */
254 static unsigned int cb_pcidda_serial_in(struct comedi_device *dev);
255 static void cb_pcidda_serial_out(struct comedi_device *dev, unsigned int value,
256 unsigned int num_bits);
257 static unsigned int cb_pcidda_read_eeprom(struct comedi_device *dev,
258 unsigned int address);
259 static void cb_pcidda_calibrate(struct comedi_device *dev, unsigned int channel,
263 * The struct comedi_driver structure tells the Comedi core module
264 * which functions to call to configure/deconfigure (attach/detach)
265 * the board, and also about the kernel module that contains
268 static struct comedi_driver driver_cb_pcidda = {
269 .driver_name = "cb_pcidda",
270 .module = THIS_MODULE,
271 .attach = cb_pcidda_attach,
272 .detach = cb_pcidda_detach,
276 * Attach is called by the Comedi core to configure the driver
277 * for a particular board.
279 static int cb_pcidda_attach(struct comedi_device *dev,
280 struct comedi_devconfig *it)
282 struct comedi_subdevice *s;
283 struct pci_dev *pcidev;
286 printk("comedi%d: cb_pcidda: ", dev->minor);
289 * Allocate the private structure area.
291 if (alloc_private(dev, sizeof(struct cb_pcidda_private)) < 0)
295 * Probe the device to determine what device in the series it is.
299 for (pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
301 pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pcidev)) {
302 if (pcidev->vendor == PCI_VENDOR_ID_CB) {
303 if (it->options[0] || it->options[1]) {
304 if (pcidev->bus->number != it->options[0] ||
305 PCI_SLOT(pcidev->devfn) != it->options[1]) {
309 for (index = 0; index < ARRAY_SIZE(cb_pcidda_boards); index++) {
310 if (cb_pcidda_boards[index].device_id ==
319 ("Not a ComputerBoards/MeasurementComputing card on requested position\n");
323 devpriv->pci_dev = pcidev;
324 dev->board_ptr = cb_pcidda_boards + index;
325 /* "thisboard" macro can be used from here. */
326 printk("Found %s at requested position\n", thisboard->name);
329 * Enable PCI device and request regions.
331 if (comedi_pci_enable(pcidev, thisboard->name)) {
333 ("cb_pcidda: failed to enable PCI device and request regions\n");
338 * Allocate the I/O ports.
341 pci_resource_start(devpriv->pci_dev, DIGITALIO_BADRINDEX);
342 devpriv->dac = pci_resource_start(devpriv->pci_dev, DAC_BADRINDEX);
345 * Warn about the status of the driver.
347 if (thisboard->status == 2)
349 ("WARNING: DRIVER FOR THIS BOARD NOT CHECKED WITH MANUAL. "
350 "WORKS ASSUMING FULL COMPATIBILITY WITH PCI-DDA08/12. "
351 "PLEASE REPORT USAGE TO <ivanmr@altavista.com>.\n");
354 * Initialize dev->board_name.
356 dev->board_name = thisboard->name;
359 * Allocate the subdevice structures.
361 if (alloc_subdevices(dev, 3) < 0)
364 s = dev->subdevices + 0;
365 /* analog output subdevice */
366 s->type = COMEDI_SUBD_AO;
367 s->subdev_flags = SDF_WRITABLE;
368 s->n_chan = thisboard->ao_chans;
369 s->maxdata = (1 << thisboard->ao_bits) - 1;
370 s->range_table = thisboard->ranges;
371 s->insn_write = cb_pcidda_ao_winsn;
373 /* s->subdev_flags |= SDF_CMD_READ; */
374 /* s->do_cmd = cb_pcidda_ai_cmd; */
375 /* s->do_cmdtest = cb_pcidda_ai_cmdtest; */
377 /* two 8255 digital io subdevices */
378 s = dev->subdevices + 1;
379 subdev_8255_init(dev, s, NULL, devpriv->digitalio);
380 s = dev->subdevices + 2;
381 subdev_8255_init(dev, s, NULL, devpriv->digitalio + PORT2A);
384 for (index = 0; index < EEPROM_SIZE; index++) {
385 devpriv->eeprom_data[index] = cb_pcidda_read_eeprom(dev, index);
386 printk(" %i:0x%x ", index, devpriv->eeprom_data[index]);
390 /* set calibrations dacs */
391 for (index = 0; index < thisboard->ao_chans; index++)
392 cb_pcidda_calibrate(dev, index, devpriv->ao_range[index]);
398 * _detach is called to deconfigure a device. It should deallocate
400 * This function is also called when _attach() fails, so it should be
401 * careful not to release resources that were not necessarily
402 * allocated by _attach(). dev->private and dev->subdevices are
403 * deallocated automatically by the core.
405 static int cb_pcidda_detach(struct comedi_device *dev)
408 * Deallocate the I/O ports.
411 if (devpriv->pci_dev) {
413 comedi_pci_disable(devpriv->pci_dev);
414 pci_dev_put(devpriv->pci_dev);
418 if (dev->subdevices) {
419 subdev_8255_cleanup(dev, dev->subdevices + 1);
420 subdev_8255_cleanup(dev, dev->subdevices + 2);
423 printk("comedi%d: cb_pcidda: remove\n", dev->minor);
429 * I will program this later... ;-)
432 static int cb_pcidda_ai_cmd(struct comedi_device *dev,
433 struct comedi_subdevice *s)
435 printk("cb_pcidda_ai_cmd\n");
436 printk("subdev: %d\n", cmd->subdev);
437 printk("flags: %d\n", cmd->flags);
438 printk("start_src: %d\n", cmd->start_src);
439 printk("start_arg: %d\n", cmd->start_arg);
440 printk("scan_begin_src: %d\n", cmd->scan_begin_src);
441 printk("convert_src: %d\n", cmd->convert_src);
442 printk("convert_arg: %d\n", cmd->convert_arg);
443 printk("scan_end_src: %d\n", cmd->scan_end_src);
444 printk("scan_end_arg: %d\n", cmd->scan_end_arg);
445 printk("stop_src: %d\n", cmd->stop_src);
446 printk("stop_arg: %d\n", cmd->stop_arg);
447 printk("chanlist_len: %d\n", cmd->chanlist_len);
452 static int cb_pcidda_ai_cmdtest(struct comedi_device *dev,
453 struct comedi_subdevice *s,
454 struct comedi_cmd *cmd)
459 /* cmdtest tests a particular command to see if it is valid.
460 * Using the cmdtest ioctl, a user can create a valid cmd
461 * and then have it executes by the cmd ioctl.
463 * cmdtest returns 1,2,3,4 or 0, depending on which tests
464 * the command passes. */
466 /* step 1: make sure trigger sources are trivially valid */
468 tmp = cmd->start_src;
469 cmd->start_src &= TRIG_NOW;
470 if (!cmd->start_src || tmp != cmd->start_src)
473 tmp = cmd->scan_begin_src;
474 cmd->scan_begin_src &= TRIG_TIMER | TRIG_EXT;
475 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
478 tmp = cmd->convert_src;
479 cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
480 if (!cmd->convert_src || tmp != cmd->convert_src)
483 tmp = cmd->scan_end_src;
484 cmd->scan_end_src &= TRIG_COUNT;
485 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
489 cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
490 if (!cmd->stop_src || tmp != cmd->stop_src)
496 /* step 2: make sure trigger sources are unique and mutually compatible */
498 /* note that mutual compatibility is not an issue here */
499 if (cmd->scan_begin_src != TRIG_TIMER
500 && cmd->scan_begin_src != TRIG_EXT)
502 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
504 if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
510 /* step 3: make sure arguments are trivially compatible */
512 if (cmd->start_arg != 0) {
516 #define MAX_SPEED 10000 /* in nanoseconds */
517 #define MIN_SPEED 1000000000 /* in nanoseconds */
519 if (cmd->scan_begin_src == TRIG_TIMER) {
520 if (cmd->scan_begin_arg < MAX_SPEED) {
521 cmd->scan_begin_arg = MAX_SPEED;
524 if (cmd->scan_begin_arg > MIN_SPEED) {
525 cmd->scan_begin_arg = MIN_SPEED;
529 /* external trigger */
530 /* should be level/edge, hi/lo specification here */
531 /* should specify multiple external triggers */
532 if (cmd->scan_begin_arg > 9) {
533 cmd->scan_begin_arg = 9;
537 if (cmd->convert_src == TRIG_TIMER) {
538 if (cmd->convert_arg < MAX_SPEED) {
539 cmd->convert_arg = MAX_SPEED;
542 if (cmd->convert_arg > MIN_SPEED) {
543 cmd->convert_arg = MIN_SPEED;
547 /* external trigger */
549 if (cmd->convert_arg > 9) {
550 cmd->convert_arg = 9;
555 if (cmd->scan_end_arg != cmd->chanlist_len) {
556 cmd->scan_end_arg = cmd->chanlist_len;
559 if (cmd->stop_src == TRIG_COUNT) {
560 if (cmd->stop_arg > 0x00ffffff) {
561 cmd->stop_arg = 0x00ffffff;
566 if (cmd->stop_arg != 0) {
575 /* step 4: fix up any arguments */
577 if (cmd->scan_begin_src == TRIG_TIMER) {
578 tmp = cmd->scan_begin_arg;
579 cb_pcidda_ns_to_timer(&cmd->scan_begin_arg,
580 cmd->flags & TRIG_ROUND_MASK);
581 if (tmp != cmd->scan_begin_arg)
584 if (cmd->convert_src == TRIG_TIMER) {
585 tmp = cmd->convert_arg;
586 cb_pcidda_ns_to_timer(&cmd->convert_arg,
587 cmd->flags & TRIG_ROUND_MASK);
588 if (tmp != cmd->convert_arg)
590 if (cmd->scan_begin_src == TRIG_TIMER &&
591 cmd->scan_begin_arg <
592 cmd->convert_arg * cmd->scan_end_arg) {
593 cmd->scan_begin_arg =
594 cmd->convert_arg * cmd->scan_end_arg;
606 /* This function doesn't require a particular form, this is just
607 * what happens to be used in some of the drivers. It should
608 * convert ns nanoseconds to a counter value suitable for programming
609 * the device. Also, it should adjust ns so that it cooresponds to
610 * the actual time that the device will use. */
612 static int cb_pcidda_ns_to_timer(unsigned int *ns, int round)
619 static int cb_pcidda_ao_winsn(struct comedi_device *dev,
620 struct comedi_subdevice *s,
621 struct comedi_insn *insn, unsigned int *data)
623 unsigned int command;
624 unsigned int channel, range;
626 channel = CR_CHAN(insn->chanspec);
627 range = CR_RANGE(insn->chanspec);
629 /* adjust calibration dacs if range has changed */
630 if (range != devpriv->ao_range[channel])
631 cb_pcidda_calibrate(dev, channel, range);
633 /* output channel configuration */
634 command = NOSU | ENABLEDAC;
636 /* output channel range */
639 command |= BIP | RANGE10V;
642 command |= BIP | RANGE5V;
645 command |= BIP | RANGE2V5;
648 command |= UNIP | RANGE10V;
651 command |= UNIP | RANGE5V;
654 command |= UNIP | RANGE2V5;
658 /* output channel specification */
659 command |= channel << 2;
660 outw(command, devpriv->dac + DACONTROL);
663 outw(data[0], devpriv->dac + DADATA + channel * 2);
665 /* return the number of samples read/written */
669 /* lowlevel read from eeprom */
670 static unsigned int cb_pcidda_serial_in(struct comedi_device *dev)
672 unsigned int value = 0;
674 const int value_width = 16; /* number of bits wide values are */
676 for (i = 1; i <= value_width; i++) {
677 /* read bits most significant bit first */
678 if (inw_p(devpriv->dac + DACALIBRATION1) & SERIAL_OUT_BIT)
679 value |= 1 << (value_width - i);
685 /* lowlevel write to eeprom/dac */
686 static void cb_pcidda_serial_out(struct comedi_device *dev, unsigned int value,
687 unsigned int num_bits)
691 for (i = 1; i <= num_bits; i++) {
692 /* send bits most significant bit first */
693 if (value & (1 << (num_bits - i)))
694 devpriv->dac_cal1_bits |= SERIAL_IN_BIT;
696 devpriv->dac_cal1_bits &= ~SERIAL_IN_BIT;
697 outw_p(devpriv->dac_cal1_bits, devpriv->dac + DACALIBRATION1);
701 /* reads a 16 bit value from board's eeprom */
702 static unsigned int cb_pcidda_read_eeprom(struct comedi_device *dev,
703 unsigned int address)
706 unsigned int cal2_bits;
708 const int max_num_caldacs = 4; /* one caldac for every two dac channels */
709 const int read_instruction = 0x6; /* bits to send to tell eeprom we want to read */
710 const int instruction_length = 3;
711 const int address_length = 8;
713 /* send serial output stream to eeprom */
714 cal2_bits = SELECT_EEPROM_BIT | DESELECT_REF_DAC_BIT | DUMMY_BIT;
715 /* deactivate caldacs (one caldac for every two channels) */
716 for (i = 0; i < max_num_caldacs; i++)
717 cal2_bits |= DESELECT_CALDAC_BIT(i);
718 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
720 /* tell eeprom we want to read */
721 cb_pcidda_serial_out(dev, read_instruction, instruction_length);
722 /* send address we want to read from */
723 cb_pcidda_serial_out(dev, address, address_length);
725 value = cb_pcidda_serial_in(dev);
727 /* deactivate eeprom */
728 cal2_bits &= ~SELECT_EEPROM_BIT;
729 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
734 /* writes to 8 bit calibration dacs */
735 static void cb_pcidda_write_caldac(struct comedi_device *dev,
736 unsigned int caldac, unsigned int channel,
739 unsigned int cal2_bits;
741 const int num_channel_bits = 3; /* caldacs use 3 bit channel specification */
742 const int num_caldac_bits = 8; /* 8 bit calibration dacs */
743 const int max_num_caldacs = 4; /* one caldac for every two dac channels */
745 /* write 3 bit channel */
746 cb_pcidda_serial_out(dev, channel, num_channel_bits);
747 /* write 8 bit caldac value */
748 cb_pcidda_serial_out(dev, value, num_caldac_bits);
751 * latch stream into appropriate caldac deselect reference dac
753 cal2_bits = DESELECT_REF_DAC_BIT | DUMMY_BIT;
754 /* deactivate caldacs (one caldac for every two channels) */
755 for (i = 0; i < max_num_caldacs; i++)
756 cal2_bits |= DESELECT_CALDAC_BIT(i);
757 /* activate the caldac we want */
758 cal2_bits &= ~DESELECT_CALDAC_BIT(caldac);
759 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
760 /* deactivate caldac */
761 cal2_bits |= DESELECT_CALDAC_BIT(caldac);
762 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
765 /* returns caldac that calibrates given analog out channel */
766 static unsigned int caldac_number(unsigned int channel)
771 /* returns caldac channel that provides fine gain for given ao channel */
772 static unsigned int fine_gain_channel(unsigned int ao_channel)
774 return 4 * (ao_channel % 2);
777 /* returns caldac channel that provides coarse gain for given ao channel */
778 static unsigned int coarse_gain_channel(unsigned int ao_channel)
780 return 1 + 4 * (ao_channel % 2);
783 /* returns caldac channel that provides coarse offset for given ao channel */
784 static unsigned int coarse_offset_channel(unsigned int ao_channel)
786 return 2 + 4 * (ao_channel % 2);
789 /* returns caldac channel that provides fine offset for given ao channel */
790 static unsigned int fine_offset_channel(unsigned int ao_channel)
792 return 3 + 4 * (ao_channel % 2);
795 /* returns eeprom address that provides offset for given ao channel and range */
796 static unsigned int offset_eeprom_address(unsigned int ao_channel,
799 return 0x7 + 2 * range + 12 * ao_channel;
802 /* returns eeprom address that provides gain calibration for given ao channel and range */
803 static unsigned int gain_eeprom_address(unsigned int ao_channel,
806 return 0x8 + 2 * range + 12 * ao_channel;
809 /* returns upper byte of eeprom entry, which gives the coarse adjustment values */
810 static unsigned int eeprom_coarse_byte(unsigned int word)
812 return (word >> 8) & 0xff;
815 /* returns lower byte of eeprom entry, which gives the fine adjustment values */
816 static unsigned int eeprom_fine_byte(unsigned int word)
821 /* set caldacs to eeprom values for given channel and range */
822 static void cb_pcidda_calibrate(struct comedi_device *dev, unsigned int channel,
825 unsigned int coarse_offset, fine_offset, coarse_gain, fine_gain;
827 /* remember range so we can tell when we need to readjust calibration */
828 devpriv->ao_range[channel] = range;
830 /* get values from eeprom data */
832 eeprom_coarse_byte(devpriv->eeprom_data
833 [offset_eeprom_address(channel, range)]);
835 eeprom_fine_byte(devpriv->eeprom_data
836 [offset_eeprom_address(channel, range)]);
838 eeprom_coarse_byte(devpriv->eeprom_data
839 [gain_eeprom_address(channel, range)]);
841 eeprom_fine_byte(devpriv->eeprom_data
842 [gain_eeprom_address(channel, range)]);
845 cb_pcidda_write_caldac(dev, caldac_number(channel),
846 coarse_offset_channel(channel), coarse_offset);
847 cb_pcidda_write_caldac(dev, caldac_number(channel),
848 fine_offset_channel(channel), fine_offset);
849 cb_pcidda_write_caldac(dev, caldac_number(channel),
850 coarse_gain_channel(channel), coarse_gain);
851 cb_pcidda_write_caldac(dev, caldac_number(channel),
852 fine_gain_channel(channel), fine_gain);
856 * A convenient macro that defines init_module() and cleanup_module(),
859 COMEDI_PCI_INITCLEANUP(driver_cb_pcidda, cb_pcidda_pci_table);