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>
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10 it under the terms of the GNU General Public License as published by
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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_ID_PCIM_DDA06_16 0x0053
97 * This is straight from skel.c -- I did this in case this source file
98 * will someday support more than 1 board...
100 struct board_struct {
102 unsigned short device_id;
107 int dio_offset; /* how many bytes into the BADR are the DIO ports */
108 int regs_badrindex; /* IO Region for the control, analog output,
110 int reg_sz; /* number of bytes of registers in io region */
116 DIO_INTERNAL /* unimplemented */
119 static const struct board_struct boards[] = {
121 .name = "cb_pcimdda06-16",
122 .device_id = PCI_ID_PCIM_DDA06_16,
126 .dio_method = DIO_8255,
134 * Useful for shorthand access to the particular board structure
136 #define thisboard ((const struct board_struct *)dev->board_ptr)
138 #define REG_SZ (thisboard->reg_sz)
139 #define REGS_BADRINDEX (thisboard->regs_badrindex)
141 /* This is used by modprobe to translate PCI IDs to drivers. Should
142 * only be used for PCI and ISA-PnP devices */
143 /* Please add your PCI vendor ID to comedidev.h, and it will be forwarded
145 static DEFINE_PCI_DEVICE_TABLE(pci_table) = {
147 PCI_VENDOR_ID_COMPUTERBOARDS, PCI_ID_PCIM_DDA06_16, PCI_ANY_ID,
148 PCI_ANY_ID, 0, 0, 0}, {
152 MODULE_DEVICE_TABLE(pci, pci_table);
154 /* this structure is for data unique to this hardware driver. If
155 several hardware drivers keep similar information in this structure,
156 feel free to suggest moving the variable to the struct comedi_device struct. */
157 struct board_private_struct {
158 unsigned long registers; /* set by probe */
159 unsigned long dio_registers;
160 char attached_to_8255; /* boolean */
161 char attached_successfully; /* boolean */
162 /* would be useful for a PCI device */
163 struct pci_dev *pci_dev;
165 #define MAX_AO_READBACK_CHANNELS 6
166 /* Used for AO readback */
167 unsigned int ao_readback[MAX_AO_READBACK_CHANNELS];
172 * most drivers define the following macro to make it easy to
173 * access the private structure.
175 #define devpriv ((struct board_private_struct *)dev->private)
178 * The struct comedi_driver structure tells the Comedi core module
179 * which functions to call to configure/deconfigure (attach/detach)
180 * the board, and also about the kernel module that contains
183 static int attach(struct comedi_device *dev, struct comedi_devconfig *it);
184 static int detach(struct comedi_device *dev);
185 static struct comedi_driver cb_pcimdda_driver = {
186 .driver_name = "cb_pcimdda",
187 .module = THIS_MODULE,
192 MODULE_AUTHOR("Calin A. Culianu <calin@rtlab.org>");
193 MODULE_DESCRIPTION("Comedi low-level driver for the Computerboards PCIM-DDA "
194 "series. Currently only supports PCIM-DDA06-16 (which "
195 "also happens to be the only board in this series. :) ) ");
196 MODULE_LICENSE("GPL");
197 COMEDI_PCI_INITCLEANUP_NOMODULE(cb_pcimdda_driver, pci_table);
199 static int ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
200 struct comedi_insn *insn, unsigned int *data);
201 static int ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
202 struct comedi_insn *insn, unsigned int *data);
204 /*---------------------------------------------------------------------------
205 HELPER FUNCTION DECLARATIONS
206 -----------------------------------------------------------------------------*/
208 /* returns a maxdata value for a given n_bits */
209 static inline unsigned int figure_out_maxdata(int bits)
211 return ((unsigned int)1 << bits) - 1;
215 * Probes for a supported device.
217 * Prerequisite: private be allocated already inside dev
219 * If the device is found, it returns 0 and has the following side effects:
221 * o assigns a struct pci_dev * to dev->private->pci_dev
222 * o assigns a struct board * to dev->board_ptr
223 * o sets dev->private->registers
224 * o sets dev->private->dio_registers
226 * Otherwise, returns a -errno on error
228 static int probe(struct comedi_device *dev, const struct comedi_devconfig *it);
230 /*---------------------------------------------------------------------------
232 -----------------------------------------------------------------------------*/
235 * Attach is called by the Comedi core to configure the driver
236 * for a particular board. If you specified a board_name array
237 * in the driver structure, dev->board_ptr contains that
240 static int attach(struct comedi_device *dev, struct comedi_devconfig *it)
242 struct comedi_subdevice *s;
246 * Allocate the private structure area. alloc_private() is a
247 * convenient macro defined in comedidev.h.
248 * if this function fails (returns negative) then the private area is
251 if (alloc_private(dev, sizeof(struct board_private_struct)) < 0)
255 * If you can probe the device to determine what device in a series
256 * it is, this is the place to do it. Otherwise, dev->board_ptr
257 * should already be initialized.
259 err = probe(dev, it);
263 /* Output some info */
264 printk("comedi%d: %s: ", dev->minor, thisboard->name);
267 * Initialize dev->board_name. Note that we can use the "thisboard"
268 * macro now, since we just initialized it in the last line.
270 dev->board_name = thisboard->name;
273 * Allocate the subdevice structures. alloc_subdevice() is a
274 * convenient macro defined in comedidev.h.
276 if (alloc_subdevices(dev, 2) < 0)
279 s = dev->subdevices + 0;
281 /* analog output subdevice */
282 s->type = COMEDI_SUBD_AO;
283 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
284 s->n_chan = thisboard->ao_chans;
285 s->maxdata = figure_out_maxdata(thisboard->ao_bits);
286 /* this is hard-coded here */
288 s->range_table = &range_bipolar10;
290 s->range_table = &range_bipolar5;
291 s->insn_write = &ao_winsn;
292 s->insn_read = &ao_rinsn;
294 s = dev->subdevices + 1;
295 /* digital i/o subdevice */
296 if (thisboard->dio_chans) {
297 switch (thisboard->dio_method) {
299 /* this is a straight 8255, so register us with the 8255 driver */
300 subdev_8255_init(dev, s, NULL, devpriv->dio_registers);
301 devpriv->attached_to_8255 = 1;
305 printk("DIO_INTERNAL not implemented yet!\n");
310 s->type = COMEDI_SUBD_UNUSED;
313 devpriv->attached_successfully = 1;
315 printk("attached\n");
321 * _detach is called to deconfigure a device. It should deallocate
323 * This function is also called when _attach() fails, so it should be
324 * careful not to release resources that were not necessarily
325 * allocated by _attach(). dev->private and dev->subdevices are
326 * deallocated automatically by the core.
328 static int detach(struct comedi_device *dev)
332 if (dev->subdevices && devpriv->attached_to_8255) {
333 /* de-register us from the 8255 driver */
334 subdev_8255_cleanup(dev, dev->subdevices + 2);
335 devpriv->attached_to_8255 = 0;
338 if (devpriv->pci_dev) {
339 if (devpriv->registers)
340 comedi_pci_disable(devpriv->pci_dev);
341 pci_dev_put(devpriv->pci_dev);
344 if (devpriv->attached_successfully && thisboard)
345 printk("comedi%d: %s: detached\n", dev->minor,
353 static int ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
354 struct comedi_insn *insn, unsigned int *data)
357 int chan = CR_CHAN(insn->chanspec);
358 unsigned long offset = devpriv->registers + chan * 2;
360 /* Writing a list of values to an AO channel is probably not
361 * very useful, but that's how the interface is defined. */
362 for (i = 0; i < insn->n; i++) {
363 /* first, load the low byte */
364 outb((char)(data[i] & 0x00ff), offset);
365 /* next, write the high byte -- only after this is written is
366 the channel voltage updated in the DAC, unless
367 we're in simultaneous xfer mode (jumper on card)
368 then a rinsn is necessary to actually update the DAC --
369 see ao_rinsn() below... */
370 outb((char)(data[i] >> 8 & 0x00ff), offset + 1);
372 /* for testing only.. the actual rinsn SHOULD do an inw!
373 (see the stuff about simultaneous XFER mode on this board) */
374 devpriv->ao_readback[chan] = data[i];
377 /* return the number of samples read/written */
381 /* AO subdevices should have a read insn as well as a write insn.
383 Usually this means copying a value stored in devpriv->ao_readback.
384 However, since this board has this jumper setting called "Simultaneous
385 Xfer mode" (off by default), we will support it. Simultaneaous xfer
386 mode is accomplished by loading ALL the values you want for AO in all the
387 channels, then READing off one of the AO registers to initiate the
388 instantaneous simultaneous update of all DAC outputs, which makes
389 all AO channels update simultaneously. This is useful for some control
390 applications, I would imagine.
392 static int ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
393 struct comedi_insn *insn, unsigned int *data)
396 int chan = CR_CHAN(insn->chanspec);
398 for (i = 0; i < insn->n; i++) {
399 inw(devpriv->registers + chan * 2);
400 /* should I set data[i] to the result of the actual read on the register
401 or the cached unsigned int in devpriv->ao_readback[]? */
402 data[i] = devpriv->ao_readback[chan];
408 /*---------------------------------------------------------------------------
409 HELPER FUNCTION DEFINITIONS
410 -----------------------------------------------------------------------------*/
413 * Probes for a supported device.
415 * Prerequisite: private be allocated already inside dev
417 * If the device is found, it returns 0 and has the following side effects:
419 * o assigns a struct pci_dev * to dev->private->pci_dev
420 * o assigns a struct board * to dev->board_ptr
421 * o sets dev->private->registers
422 * o sets dev->private->dio_registers
424 * Otherwise, returns a -errno on error
426 static int probe(struct comedi_device *dev, const struct comedi_devconfig *it)
428 struct pci_dev *pcidev;
430 unsigned long registers;
432 for (pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
434 pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pcidev)) {
435 /* is it not a computer boards card? */
436 if (pcidev->vendor != PCI_VENDOR_ID_COMPUTERBOARDS)
438 /* loop through cards supported by this driver */
439 for (index = 0; index < ARRAY_SIZE(boards); index++) {
440 if (boards[index].device_id != pcidev->device)
442 /* was a particular bus/slot requested? */
443 if (it->options[0] || it->options[1]) {
444 /* are we on the wrong bus/slot? */
445 if (pcidev->bus->number != it->options[0] ||
446 PCI_SLOT(pcidev->devfn) != it->options[1]) {
452 devpriv->pci_dev = pcidev;
453 dev->board_ptr = boards + index;
454 if (comedi_pci_enable(pcidev, thisboard->name)) {
456 ("cb_pcimdda: Failed to enable PCI device and request regions\n");
460 pci_resource_start(devpriv->pci_dev,
462 devpriv->registers = registers;
463 devpriv->dio_registers
464 = devpriv->registers + thisboard->dio_offset;
469 printk("cb_pcimdda: No supported ComputerBoards/MeasurementComputing "
470 "card found at the requested position\n");