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) = {
201 PCI_VENDOR_ID_CB, 0x0020, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, {
202 PCI_VENDOR_ID_CB, 0x0021, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, {
203 PCI_VENDOR_ID_CB, 0x0022, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, {
204 PCI_VENDOR_ID_CB, 0x0023, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, {
205 PCI_VENDOR_ID_CB, 0x0024, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, {
206 PCI_VENDOR_ID_CB, 0x0025, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, {
210 MODULE_DEVICE_TABLE(pci, cb_pcidda_pci_table);
213 * Useful for shorthand access to the particular board structure
215 #define thisboard ((const struct cb_pcidda_board *)dev->board_ptr)
217 /* this structure is for data unique to this hardware driver. If
218 several hardware drivers keep similar information in this structure,
219 feel free to suggest moving the variable to the struct comedi_device struct. */
220 struct cb_pcidda_private {
223 /* would be useful for a PCI device */
224 struct pci_dev *pci_dev;
226 unsigned long digitalio;
229 /* unsigned long control_status; */
230 /* unsigned long adc_fifo; */
232 unsigned int dac_cal1_bits; /* bits last written to da calibration register 1 */
233 unsigned int ao_range[MAX_AO_CHANNELS]; /* current range settings for output channels */
234 u16 eeprom_data[EEPROM_SIZE]; /* software copy of board's eeprom */
238 * most drivers define the following macro to make it easy to
239 * access the private structure.
241 #define devpriv ((struct cb_pcidda_private *)dev->private)
243 static int cb_pcidda_attach(struct comedi_device *dev,
244 struct comedi_devconfig *it);
245 static int cb_pcidda_detach(struct comedi_device *dev);
246 /* static int cb_pcidda_ai_rinsn(struct comedi_device *dev,struct comedi_subdevice *s,struct comedi_insn *insn,unsigned int *data); */
247 static int cb_pcidda_ao_winsn(struct comedi_device *dev,
248 struct comedi_subdevice *s,
249 struct comedi_insn *insn, unsigned int *data);
251 /* static int cb_pcidda_ai_cmd(struct comedi_device *dev, struct *comedi_subdevice *s);*/
252 /* static int cb_pcidda_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd); */
253 /* static int cb_pcidda_ns_to_timer(unsigned int *ns,int *round); */
255 static unsigned int cb_pcidda_serial_in(struct comedi_device *dev);
256 static void cb_pcidda_serial_out(struct comedi_device *dev, unsigned int value,
257 unsigned int num_bits);
258 static unsigned int cb_pcidda_read_eeprom(struct comedi_device *dev,
259 unsigned int address);
260 static void cb_pcidda_calibrate(struct comedi_device *dev, unsigned int channel,
264 * The struct comedi_driver structure tells the Comedi core module
265 * which functions to call to configure/deconfigure (attach/detach)
266 * the board, and also about the kernel module that contains
269 static struct comedi_driver driver_cb_pcidda = {
270 .driver_name = "cb_pcidda",
271 .module = THIS_MODULE,
272 .attach = cb_pcidda_attach,
273 .detach = cb_pcidda_detach,
277 * Attach is called by the Comedi core to configure the driver
278 * for a particular board.
280 static int cb_pcidda_attach(struct comedi_device *dev,
281 struct comedi_devconfig *it)
283 struct comedi_subdevice *s;
284 struct pci_dev *pcidev;
287 printk("comedi%d: cb_pcidda: ", dev->minor);
290 * Allocate the private structure area.
292 if (alloc_private(dev, sizeof(struct cb_pcidda_private)) < 0)
296 * Probe the device to determine what device in the series it is.
300 for (pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
302 pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pcidev)) {
303 if (pcidev->vendor == PCI_VENDOR_ID_CB) {
304 if (it->options[0] || it->options[1]) {
305 if (pcidev->bus->number != it->options[0] ||
306 PCI_SLOT(pcidev->devfn) != it->options[1]) {
310 for (index = 0; index < N_BOARDS; index++) {
311 if (cb_pcidda_boards[index].device_id ==
320 ("Not a ComputerBoards/MeasurementComputing card on requested position\n");
324 devpriv->pci_dev = pcidev;
325 dev->board_ptr = cb_pcidda_boards + index;
326 /* "thisboard" macro can be used from here. */
327 printk("Found %s at requested position\n", thisboard->name);
330 * Enable PCI device and request regions.
332 if (comedi_pci_enable(pcidev, thisboard->name)) {
334 ("cb_pcidda: failed to enable PCI device and request regions\n");
339 * Allocate the I/O ports.
342 pci_resource_start(devpriv->pci_dev, DIGITALIO_BADRINDEX);
343 devpriv->dac = pci_resource_start(devpriv->pci_dev, DAC_BADRINDEX);
346 * Warn about the status of the driver.
348 if (thisboard->status == 2)
350 ("WARNING: DRIVER FOR THIS BOARD NOT CHECKED WITH MANUAL. "
351 "WORKS ASSUMING FULL COMPATIBILITY WITH PCI-DDA08/12. "
352 "PLEASE REPORT USAGE TO <ivanmr@altavista.com>.\n");
355 * Initialize dev->board_name.
357 dev->board_name = thisboard->name;
360 * Allocate the subdevice structures.
362 if (alloc_subdevices(dev, 3) < 0)
365 s = dev->subdevices + 0;
366 /* analog output subdevice */
367 s->type = COMEDI_SUBD_AO;
368 s->subdev_flags = SDF_WRITABLE;
369 s->n_chan = thisboard->ao_chans;
370 s->maxdata = (1 << thisboard->ao_bits) - 1;
371 s->range_table = thisboard->ranges;
372 s->insn_write = cb_pcidda_ao_winsn;
374 /* s->subdev_flags |= SDF_CMD_READ; */
375 /* s->do_cmd = cb_pcidda_ai_cmd; */
376 /* s->do_cmdtest = cb_pcidda_ai_cmdtest; */
378 /* two 8255 digital io subdevices */
379 s = dev->subdevices + 1;
380 subdev_8255_init(dev, s, NULL, devpriv->digitalio);
381 s = dev->subdevices + 2;
382 subdev_8255_init(dev, s, NULL, devpriv->digitalio + PORT2A);
385 for (index = 0; index < EEPROM_SIZE; index++) {
386 devpriv->eeprom_data[index] = cb_pcidda_read_eeprom(dev, index);
387 printk(" %i:0x%x ", index, devpriv->eeprom_data[index]);
391 /* set calibrations dacs */
392 for (index = 0; index < thisboard->ao_chans; index++)
393 cb_pcidda_calibrate(dev, index, devpriv->ao_range[index]);
399 * _detach is called to deconfigure a device. It should deallocate
401 * This function is also called when _attach() fails, so it should be
402 * careful not to release resources that were not necessarily
403 * allocated by _attach(). dev->private and dev->subdevices are
404 * deallocated automatically by the core.
406 static int cb_pcidda_detach(struct comedi_device *dev)
409 * Deallocate the I/O ports.
412 if (devpriv->pci_dev) {
414 comedi_pci_disable(devpriv->pci_dev);
415 pci_dev_put(devpriv->pci_dev);
419 if (dev->subdevices) {
420 subdev_8255_cleanup(dev, dev->subdevices + 1);
421 subdev_8255_cleanup(dev, dev->subdevices + 2);
424 printk("comedi%d: cb_pcidda: remove\n", dev->minor);
430 * I will program this later... ;-)
433 static int cb_pcidda_ai_cmd(struct comedi_device *dev,
434 struct comedi_subdevice *s)
436 printk("cb_pcidda_ai_cmd\n");
437 printk("subdev: %d\n", cmd->subdev);
438 printk("flags: %d\n", cmd->flags);
439 printk("start_src: %d\n", cmd->start_src);
440 printk("start_arg: %d\n", cmd->start_arg);
441 printk("scan_begin_src: %d\n", cmd->scan_begin_src);
442 printk("convert_src: %d\n", cmd->convert_src);
443 printk("convert_arg: %d\n", cmd->convert_arg);
444 printk("scan_end_src: %d\n", cmd->scan_end_src);
445 printk("scan_end_arg: %d\n", cmd->scan_end_arg);
446 printk("stop_src: %d\n", cmd->stop_src);
447 printk("stop_arg: %d\n", cmd->stop_arg);
448 printk("chanlist_len: %d\n", cmd->chanlist_len);
453 static int cb_pcidda_ai_cmdtest(struct comedi_device *dev,
454 struct comedi_subdevice *s,
455 struct comedi_cmd *cmd)
460 /* cmdtest tests a particular command to see if it is valid.
461 * Using the cmdtest ioctl, a user can create a valid cmd
462 * and then have it executes by the cmd ioctl.
464 * cmdtest returns 1,2,3,4 or 0, depending on which tests
465 * the command passes. */
467 /* step 1: make sure trigger sources are trivially valid */
469 tmp = cmd->start_src;
470 cmd->start_src &= TRIG_NOW;
471 if (!cmd->start_src || tmp != cmd->start_src)
474 tmp = cmd->scan_begin_src;
475 cmd->scan_begin_src &= TRIG_TIMER | TRIG_EXT;
476 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
479 tmp = cmd->convert_src;
480 cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
481 if (!cmd->convert_src || tmp != cmd->convert_src)
484 tmp = cmd->scan_end_src;
485 cmd->scan_end_src &= TRIG_COUNT;
486 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
490 cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
491 if (!cmd->stop_src || tmp != cmd->stop_src)
497 /* step 2: make sure trigger sources are unique and mutually compatible */
499 /* note that mutual compatibility is not an issue here */
500 if (cmd->scan_begin_src != TRIG_TIMER
501 && cmd->scan_begin_src != TRIG_EXT)
503 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
505 if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
511 /* step 3: make sure arguments are trivially compatible */
513 if (cmd->start_arg != 0) {
517 #define MAX_SPEED 10000 /* in nanoseconds */
518 #define MIN_SPEED 1000000000 /* in nanoseconds */
520 if (cmd->scan_begin_src == TRIG_TIMER) {
521 if (cmd->scan_begin_arg < MAX_SPEED) {
522 cmd->scan_begin_arg = MAX_SPEED;
525 if (cmd->scan_begin_arg > MIN_SPEED) {
526 cmd->scan_begin_arg = MIN_SPEED;
530 /* external trigger */
531 /* should be level/edge, hi/lo specification here */
532 /* should specify multiple external triggers */
533 if (cmd->scan_begin_arg > 9) {
534 cmd->scan_begin_arg = 9;
538 if (cmd->convert_src == TRIG_TIMER) {
539 if (cmd->convert_arg < MAX_SPEED) {
540 cmd->convert_arg = MAX_SPEED;
543 if (cmd->convert_arg > MIN_SPEED) {
544 cmd->convert_arg = MIN_SPEED;
548 /* external trigger */
550 if (cmd->convert_arg > 9) {
551 cmd->convert_arg = 9;
556 if (cmd->scan_end_arg != cmd->chanlist_len) {
557 cmd->scan_end_arg = cmd->chanlist_len;
560 if (cmd->stop_src == TRIG_COUNT) {
561 if (cmd->stop_arg > 0x00ffffff) {
562 cmd->stop_arg = 0x00ffffff;
567 if (cmd->stop_arg != 0) {
576 /* step 4: fix up any arguments */
578 if (cmd->scan_begin_src == TRIG_TIMER) {
579 tmp = cmd->scan_begin_arg;
580 cb_pcidda_ns_to_timer(&cmd->scan_begin_arg,
581 cmd->flags & TRIG_ROUND_MASK);
582 if (tmp != cmd->scan_begin_arg)
585 if (cmd->convert_src == TRIG_TIMER) {
586 tmp = cmd->convert_arg;
587 cb_pcidda_ns_to_timer(&cmd->convert_arg,
588 cmd->flags & TRIG_ROUND_MASK);
589 if (tmp != cmd->convert_arg)
591 if (cmd->scan_begin_src == TRIG_TIMER &&
592 cmd->scan_begin_arg <
593 cmd->convert_arg * cmd->scan_end_arg) {
594 cmd->scan_begin_arg =
595 cmd->convert_arg * cmd->scan_end_arg;
607 /* This function doesn't require a particular form, this is just
608 * what happens to be used in some of the drivers. It should
609 * convert ns nanoseconds to a counter value suitable for programming
610 * the device. Also, it should adjust ns so that it cooresponds to
611 * the actual time that the device will use. */
613 static int cb_pcidda_ns_to_timer(unsigned int *ns, int round)
620 static int cb_pcidda_ao_winsn(struct comedi_device *dev,
621 struct comedi_subdevice *s,
622 struct comedi_insn *insn, unsigned int *data)
624 unsigned int command;
625 unsigned int channel, range;
627 channel = CR_CHAN(insn->chanspec);
628 range = CR_RANGE(insn->chanspec);
630 /* adjust calibration dacs if range has changed */
631 if (range != devpriv->ao_range[channel])
632 cb_pcidda_calibrate(dev, channel, range);
634 /* output channel configuration */
635 command = NOSU | ENABLEDAC;
637 /* output channel range */
640 command |= BIP | RANGE10V;
643 command |= BIP | RANGE5V;
646 command |= BIP | RANGE2V5;
649 command |= UNIP | RANGE10V;
652 command |= UNIP | RANGE5V;
655 command |= UNIP | RANGE2V5;
659 /* output channel specification */
660 command |= channel << 2;
661 outw(command, devpriv->dac + DACONTROL);
664 outw(data[0], devpriv->dac + DADATA + channel * 2);
666 /* return the number of samples read/written */
670 /* lowlevel read from eeprom */
671 static unsigned int cb_pcidda_serial_in(struct comedi_device *dev)
673 unsigned int value = 0;
675 const int value_width = 16; /* number of bits wide values are */
677 for (i = 1; i <= value_width; i++) {
678 /* read bits most significant bit first */
679 if (inw_p(devpriv->dac + DACALIBRATION1) & SERIAL_OUT_BIT)
680 value |= 1 << (value_width - i);
686 /* lowlevel write to eeprom/dac */
687 static void cb_pcidda_serial_out(struct comedi_device *dev, unsigned int value,
688 unsigned int num_bits)
692 for (i = 1; i <= num_bits; i++) {
693 /* send bits most significant bit first */
694 if (value & (1 << (num_bits - i)))
695 devpriv->dac_cal1_bits |= SERIAL_IN_BIT;
697 devpriv->dac_cal1_bits &= ~SERIAL_IN_BIT;
698 outw_p(devpriv->dac_cal1_bits, devpriv->dac + DACALIBRATION1);
702 /* reads a 16 bit value from board's eeprom */
703 static unsigned int cb_pcidda_read_eeprom(struct comedi_device *dev,
704 unsigned int address)
707 unsigned int cal2_bits;
709 const int max_num_caldacs = 4; /* one caldac for every two dac channels */
710 const int read_instruction = 0x6; /* bits to send to tell eeprom we want to read */
711 const int instruction_length = 3;
712 const int address_length = 8;
714 /* send serial output stream to eeprom */
715 cal2_bits = SELECT_EEPROM_BIT | DESELECT_REF_DAC_BIT | DUMMY_BIT;
716 /* deactivate caldacs (one caldac for every two channels) */
717 for (i = 0; i < max_num_caldacs; i++)
718 cal2_bits |= DESELECT_CALDAC_BIT(i);
719 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
721 /* tell eeprom we want to read */
722 cb_pcidda_serial_out(dev, read_instruction, instruction_length);
723 /* send address we want to read from */
724 cb_pcidda_serial_out(dev, address, address_length);
726 value = cb_pcidda_serial_in(dev);
728 /* deactivate eeprom */
729 cal2_bits &= ~SELECT_EEPROM_BIT;
730 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
735 /* writes to 8 bit calibration dacs */
736 static void cb_pcidda_write_caldac(struct comedi_device *dev,
737 unsigned int caldac, unsigned int channel,
740 unsigned int cal2_bits;
742 const int num_channel_bits = 3; /* caldacs use 3 bit channel specification */
743 const int num_caldac_bits = 8; /* 8 bit calibration dacs */
744 const int max_num_caldacs = 4; /* one caldac for every two dac channels */
746 /* write 3 bit channel */
747 cb_pcidda_serial_out(dev, channel, num_channel_bits);
748 /* write 8 bit caldac value */
749 cb_pcidda_serial_out(dev, value, num_caldac_bits);
752 * latch stream into appropriate caldac deselect reference dac
754 cal2_bits = DESELECT_REF_DAC_BIT | DUMMY_BIT;
755 /* deactivate caldacs (one caldac for every two channels) */
756 for (i = 0; i < max_num_caldacs; i++)
757 cal2_bits |= DESELECT_CALDAC_BIT(i);
758 /* activate the caldac we want */
759 cal2_bits &= ~DESELECT_CALDAC_BIT(caldac);
760 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
761 /* deactivate caldac */
762 cal2_bits |= DESELECT_CALDAC_BIT(caldac);
763 outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
766 /* returns caldac that calibrates given analog out channel */
767 static unsigned int caldac_number(unsigned int channel)
772 /* returns caldac channel that provides fine gain for given ao channel */
773 static unsigned int fine_gain_channel(unsigned int ao_channel)
775 return 4 * (ao_channel % 2);
778 /* returns caldac channel that provides coarse gain for given ao channel */
779 static unsigned int coarse_gain_channel(unsigned int ao_channel)
781 return 1 + 4 * (ao_channel % 2);
784 /* returns caldac channel that provides coarse offset for given ao channel */
785 static unsigned int coarse_offset_channel(unsigned int ao_channel)
787 return 2 + 4 * (ao_channel % 2);
790 /* returns caldac channel that provides fine offset for given ao channel */
791 static unsigned int fine_offset_channel(unsigned int ao_channel)
793 return 3 + 4 * (ao_channel % 2);
796 /* returns eeprom address that provides offset for given ao channel and range */
797 static unsigned int offset_eeprom_address(unsigned int ao_channel,
800 return 0x7 + 2 * range + 12 * ao_channel;
803 /* returns eeprom address that provides gain calibration for given ao channel and range */
804 static unsigned int gain_eeprom_address(unsigned int ao_channel,
807 return 0x8 + 2 * range + 12 * ao_channel;
810 /* returns upper byte of eeprom entry, which gives the coarse adjustment values */
811 static unsigned int eeprom_coarse_byte(unsigned int word)
813 return (word >> 8) & 0xff;
816 /* returns lower byte of eeprom entry, which gives the fine adjustment values */
817 static unsigned int eeprom_fine_byte(unsigned int word)
822 /* set caldacs to eeprom values for given channel and range */
823 static void cb_pcidda_calibrate(struct comedi_device *dev, unsigned int channel,
826 unsigned int coarse_offset, fine_offset, coarse_gain, fine_gain;
828 /* remember range so we can tell when we need to readjust calibration */
829 devpriv->ao_range[channel] = range;
831 /* get values from eeprom data */
833 eeprom_coarse_byte(devpriv->eeprom_data
834 [offset_eeprom_address(channel, range)]);
836 eeprom_fine_byte(devpriv->eeprom_data
837 [offset_eeprom_address(channel, range)]);
839 eeprom_coarse_byte(devpriv->eeprom_data
840 [gain_eeprom_address(channel, range)]);
842 eeprom_fine_byte(devpriv->eeprom_data
843 [gain_eeprom_address(channel, range)]);
846 cb_pcidda_write_caldac(dev, caldac_number(channel),
847 coarse_offset_channel(channel), coarse_offset);
848 cb_pcidda_write_caldac(dev, caldac_number(channel),
849 fine_offset_channel(channel), fine_offset);
850 cb_pcidda_write_caldac(dev, caldac_number(channel),
851 coarse_gain_channel(channel), coarse_gain);
852 cb_pcidda_write_caldac(dev, caldac_number(channel),
853 fine_gain_channel(channel), fine_gain);
857 * A convenient macro that defines init_module() and cleanup_module(),
860 COMEDI_PCI_INITCLEANUP(driver_cb_pcidda, cb_pcidda_pci_table);