2 comedi/drivers/cb_pcimdda.c
3 Computer Boards PCIM-DDA06-16 Comedi driver
4 Author: Calin Culianu <calin@ajvar.org>
6 COMEDI - Linux Control and Measurement Device Interface
7 Copyright (C) 2000 David A. Schleef <ds@schleef.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.
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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.
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21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 Description: Measurement Computing PCIM-DDA06-16
27 Devices: [Measurement Computing] PCIM-DDA06-16 (cb_pcimdda)
28 Author: Calin Culianu <calin@ajvar.org>
29 Updated: Mon, 14 Apr 2008 15:15:51 +0100
32 All features of the PCIM-DDA06-16 board are supported. This board
33 has 6 16-bit AO channels, and the usual 8255 DIO setup. (24 channels,
34 configurable in banks of 8 and 4, etc.). This board does not support commands.
36 The board has a peculiar way of specifying AO gain/range settings -- You have
37 1 jumper bank on the card, which either makes all 6 AO channels either
38 5 Volt unipolar, 5V bipolar, 10 Volt unipolar or 10V bipolar.
40 Since there is absolutely _no_ way to tell in software how this jumper is set
41 (well, at least according to the rather thin spec. from Measurement Computing
42 that comes with the board), the driver assumes the jumper is at its factory
43 default setting of +/-5V.
45 Also of note is the fact that this board features another jumper, whose
46 state is also completely invisible to software. It toggles two possible AO
47 output modes on the board:
49 - Update Mode: Writing to an AO channel instantaneously updates the actual
50 signal output by the DAC on the board (this is the factory default).
51 - Simultaneous XFER Mode: Writing to an AO channel has no effect until
52 you read from any one of the AO channels. This is useful for loading
53 all 6 AO values, and then reading from any one of the AO channels on the
54 device to instantly update all 6 AO values in unison. Useful for some
55 control apps, I would assume? If your jumper is in this setting, then you
56 need to issue your comedi_data_write()s to load all the values you want,
57 then issue one comedi_data_read() on any channel on the AO subdevice
58 to initiate the simultaneous XFER.
60 Configuration Options:
61 [0] PCI bus (optional)
62 [1] PCI slot (optional)
63 [2] analog output range jumper setting
69 This is a driver for the Computer Boards PCIM-DDA06-16 Analog Output
70 card. This board has a unique register layout and as such probably
71 deserves its own driver file.
73 It is theoretically possible to integrate this board into the cb_pcidda
74 file, but since that isn't my code, I didn't want to significantly
75 modify that file to support this board (I thought it impolite to do so).
77 At any rate, if you feel ambitious, please feel free to take
78 the code out of this file and combine it with a more unified driver
81 I would like to thank Timothy Curry <Timothy.Curry@rdec.redstone.army.mil>
82 for lending me a board so that I could write this driver.
84 -Calin Culianu <calin@ajvar.org>
87 #include "../comedidev.h"
89 #include "comedi_pci.h"
93 /* device ids of the cards we support -- currently only 1 card supported */
94 #define PCI_VENDOR_ID_COMPUTERBOARDS 0x1307
95 #define PCI_ID_PCIM_DDA06_16 0x0053
98 * This is straight from skel.c -- I did this in case this source file
99 * will someday support more than 1 board...
101 struct board_struct {
103 unsigned short device_id;
108 int dio_offset; /* how many bytes into the BADR are the DIO ports */
109 int regs_badrindex; /* IO Region for the control, analog output,
111 int reg_sz; /* number of bytes of registers in io region */
117 DIO_INTERNAL /* unimplemented */
120 static const struct board_struct boards[] = {
122 .name = "cb_pcimdda06-16",
123 .device_id = PCI_ID_PCIM_DDA06_16,
127 .dio_method = DIO_8255,
135 * Useful for shorthand access to the particular board structure
137 #define thisboard ((const struct board_struct *)dev->board_ptr)
139 #define REG_SZ (thisboard->reg_sz)
140 #define REGS_BADRINDEX (thisboard->regs_badrindex)
142 /* This is used by modprobe to translate PCI IDs to drivers. Should
143 * only be used for PCI and ISA-PnP devices */
144 /* Please add your PCI vendor ID to comedidev.h, and it will be forwarded
146 static DEFINE_PCI_DEVICE_TABLE(pci_table) = {
148 PCI_VENDOR_ID_COMPUTERBOARDS, PCI_ID_PCIM_DDA06_16, PCI_ANY_ID,
149 PCI_ANY_ID, 0, 0, 0}, {
153 MODULE_DEVICE_TABLE(pci, pci_table);
155 /* this structure is for data unique to this hardware driver. If
156 several hardware drivers keep similar information in this structure,
157 feel free to suggest moving the variable to the struct comedi_device struct. */
158 struct board_private_struct {
159 unsigned long registers; /* set by probe */
160 unsigned long dio_registers;
161 char attached_to_8255; /* boolean */
162 char attached_successfully; /* boolean */
163 /* would be useful for a PCI device */
164 struct pci_dev *pci_dev;
166 #define MAX_AO_READBACK_CHANNELS 6
167 /* Used for AO readback */
168 unsigned int ao_readback[MAX_AO_READBACK_CHANNELS];
173 * most drivers define the following macro to make it easy to
174 * access the private structure.
176 #define devpriv ((struct board_private_struct *)dev->private)
179 * The struct comedi_driver structure tells the Comedi core module
180 * which functions to call to configure/deconfigure (attach/detach)
181 * the board, and also about the kernel module that contains
184 static int attach(struct comedi_device *dev, struct comedi_devconfig *it);
185 static int detach(struct comedi_device *dev);
186 static struct comedi_driver cb_pcimdda_driver = {
187 .driver_name = "cb_pcimdda",
188 .module = THIS_MODULE,
193 MODULE_AUTHOR("Calin A. Culianu <calin@rtlab.org>");
194 MODULE_DESCRIPTION("Comedi low-level driver for the Computerboards PCIM-DDA "
195 "series. Currently only supports PCIM-DDA06-16 (which "
196 "also happens to be the only board in this series. :) ) ");
197 MODULE_LICENSE("GPL");
198 COMEDI_PCI_INITCLEANUP_NOMODULE(cb_pcimdda_driver, pci_table);
200 static int ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
201 struct comedi_insn *insn, unsigned int *data);
202 static int ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
203 struct comedi_insn *insn, unsigned int *data);
205 /*---------------------------------------------------------------------------
206 HELPER FUNCTION DECLARATIONS
207 -----------------------------------------------------------------------------*/
209 /* returns a maxdata value for a given n_bits */
210 static inline unsigned int figure_out_maxdata(int bits)
212 return ((unsigned int)1 << bits) - 1;
216 * Probes for a supported device.
218 * Prerequisite: private be allocated already inside dev
220 * If the device is found, it returns 0 and has the following side effects:
222 * o assigns a struct pci_dev * to dev->private->pci_dev
223 * o assigns a struct board * to dev->board_ptr
224 * o sets dev->private->registers
225 * o sets dev->private->dio_registers
227 * Otherwise, returns a -errno on error
229 static int probe(struct comedi_device *dev, const struct comedi_devconfig *it);
231 /*---------------------------------------------------------------------------
233 -----------------------------------------------------------------------------*/
236 * Attach is called by the Comedi core to configure the driver
237 * for a particular board. If you specified a board_name array
238 * in the driver structure, dev->board_ptr contains that
241 static int attach(struct comedi_device *dev, struct comedi_devconfig *it)
243 struct comedi_subdevice *s;
247 * Allocate the private structure area. alloc_private() is a
248 * convenient macro defined in comedidev.h.
249 * if this function fails (returns negative) then the private area is
252 if (alloc_private(dev, sizeof(struct board_private_struct)) < 0)
256 * If you can probe the device to determine what device in a series
257 * it is, this is the place to do it. Otherwise, dev->board_ptr
258 * should already be initialized.
260 err = probe(dev, it);
264 /* Output some info */
265 printk("comedi%d: %s: ", dev->minor, thisboard->name);
268 * Initialize dev->board_name. Note that we can use the "thisboard"
269 * macro now, since we just initialized it in the last line.
271 dev->board_name = thisboard->name;
274 * Allocate the subdevice structures. alloc_subdevice() is a
275 * convenient macro defined in comedidev.h.
277 if (alloc_subdevices(dev, 2) < 0)
280 s = dev->subdevices + 0;
282 /* analog output subdevice */
283 s->type = COMEDI_SUBD_AO;
284 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
285 s->n_chan = thisboard->ao_chans;
286 s->maxdata = figure_out_maxdata(thisboard->ao_bits);
287 /* this is hard-coded here */
289 s->range_table = &range_bipolar10;
291 s->range_table = &range_bipolar5;
292 s->insn_write = &ao_winsn;
293 s->insn_read = &ao_rinsn;
295 s = dev->subdevices + 1;
296 /* digital i/o subdevice */
297 if (thisboard->dio_chans) {
298 switch (thisboard->dio_method) {
300 /* this is a straight 8255, so register us with the 8255 driver */
301 subdev_8255_init(dev, s, NULL, devpriv->dio_registers);
302 devpriv->attached_to_8255 = 1;
306 printk("DIO_INTERNAL not implemented yet!\n");
311 s->type = COMEDI_SUBD_UNUSED;
314 devpriv->attached_successfully = 1;
316 printk("attached\n");
322 * _detach is called to deconfigure a device. It should deallocate
324 * This function is also called when _attach() fails, so it should be
325 * careful not to release resources that were not necessarily
326 * allocated by _attach(). dev->private and dev->subdevices are
327 * deallocated automatically by the core.
329 static int detach(struct comedi_device *dev)
333 if (dev->subdevices && devpriv->attached_to_8255) {
334 /* de-register us from the 8255 driver */
335 subdev_8255_cleanup(dev, dev->subdevices + 2);
336 devpriv->attached_to_8255 = 0;
339 if (devpriv->pci_dev) {
340 if (devpriv->registers)
341 comedi_pci_disable(devpriv->pci_dev);
342 pci_dev_put(devpriv->pci_dev);
345 if (devpriv->attached_successfully && thisboard)
346 printk("comedi%d: %s: detached\n", dev->minor,
354 static int ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
355 struct comedi_insn *insn, unsigned int *data)
358 int chan = CR_CHAN(insn->chanspec);
359 unsigned long offset = devpriv->registers + chan * 2;
361 /* Writing a list of values to an AO channel is probably not
362 * very useful, but that's how the interface is defined. */
363 for (i = 0; i < insn->n; i++) {
364 /* first, load the low byte */
365 outb((char)(data[i] & 0x00ff), offset);
366 /* next, write the high byte -- only after this is written is
367 the channel voltage updated in the DAC, unless
368 we're in simultaneous xfer mode (jumper on card)
369 then a rinsn is necessary to actually update the DAC --
370 see ao_rinsn() below... */
371 outb((char)(data[i] >> 8 & 0x00ff), offset + 1);
373 /* for testing only.. the actual rinsn SHOULD do an inw!
374 (see the stuff about simultaneous XFER mode on this board) */
375 devpriv->ao_readback[chan] = data[i];
378 /* return the number of samples read/written */
382 /* AO subdevices should have a read insn as well as a write insn.
384 Usually this means copying a value stored in devpriv->ao_readback.
385 However, since this board has this jumper setting called "Simultaneous
386 Xfer mode" (off by default), we will support it. Simultaneaous xfer
387 mode is accomplished by loading ALL the values you want for AO in all the
388 channels, then READing off one of the AO registers to initiate the
389 instantaneous simultaneous update of all DAC outputs, which makes
390 all AO channels update simultaneously. This is useful for some control
391 applications, I would imagine.
393 static int ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
394 struct comedi_insn *insn, unsigned int *data)
397 int chan = CR_CHAN(insn->chanspec);
399 for (i = 0; i < insn->n; i++) {
400 inw(devpriv->registers + chan * 2);
401 /* should I set data[i] to the result of the actual read on the register
402 or the cached unsigned int in devpriv->ao_readback[]? */
403 data[i] = devpriv->ao_readback[chan];
409 /*---------------------------------------------------------------------------
410 HELPER FUNCTION DEFINITIONS
411 -----------------------------------------------------------------------------*/
414 * Probes for a supported device.
416 * Prerequisite: private be allocated already inside dev
418 * If the device is found, it returns 0 and has the following side effects:
420 * o assigns a struct pci_dev * to dev->private->pci_dev
421 * o assigns a struct board * to dev->board_ptr
422 * o sets dev->private->registers
423 * o sets dev->private->dio_registers
425 * Otherwise, returns a -errno on error
427 static int probe(struct comedi_device *dev, const struct comedi_devconfig *it)
429 struct pci_dev *pcidev;
431 unsigned long registers;
433 for (pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
435 pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pcidev)) {
436 /* is it not a computer boards card? */
437 if (pcidev->vendor != PCI_VENDOR_ID_COMPUTERBOARDS)
439 /* loop through cards supported by this driver */
440 for (index = 0; index < ARRAY_SIZE(boards); index++) {
441 if (boards[index].device_id != pcidev->device)
443 /* was a particular bus/slot requested? */
444 if (it->options[0] || it->options[1]) {
445 /* are we on the wrong bus/slot? */
446 if (pcidev->bus->number != it->options[0] ||
447 PCI_SLOT(pcidev->devfn) != it->options[1]) {
453 devpriv->pci_dev = pcidev;
454 dev->board_ptr = boards + index;
455 if (comedi_pci_enable(pcidev, thisboard->name)) {
457 ("cb_pcimdda: Failed to enable PCI device and request regions\n");
461 pci_resource_start(devpriv->pci_dev,
463 devpriv->registers = registers;
464 devpriv->dio_registers
465 = devpriv->registers + thisboard->dio_offset;
470 printk("cb_pcimdda: No supported ComputerBoards/MeasurementComputing "
471 "card found at the requested position\n");