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-rw-r--r--drivers/staging/comedi/drivers/cb_pcidda.c841
1 files changed, 841 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/cb_pcidda.c b/drivers/staging/comedi/drivers/cb_pcidda.c
new file mode 100644
index 000000000000..ed0a5eb3dd91
--- /dev/null
+++ b/drivers/staging/comedi/drivers/cb_pcidda.c
@@ -0,0 +1,841 @@
+/*
+ comedi/drivers/cb_pcidda.c
+ This intends to be a driver for the ComputerBoards / MeasurementComputing
+ PCI-DDA series.
+
+ Copyright (C) 2001 Ivan Martinez <ivanmr@altavista.com>
+ Copyright (C) 2001 Frank Mori Hess <fmhess@users.sourceforge.net>
+
+ COMEDI - Linux Control and Measurement Device Interface
+ Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+/*
+Driver: cb_pcidda
+Description: MeasurementComputing PCI-DDA series
+Author: Ivan Martinez <ivanmr@altavista.com>, Frank Mori Hess <fmhess@users.sourceforge.net>
+Status: Supports 08/16, 04/16, 02/16, 08/12, 04/12, and 02/12
+Devices: [Measurement Computing] PCI-DDA08/12 (cb_pcidda), PCI-DDA04/12,
+ PCI-DDA02/12, PCI-DDA08/16, PCI-DDA04/16, PCI-DDA02/16
+
+Configuration options:
+ [0] - PCI bus of device (optional)
+ [1] - PCI slot of device (optional)
+ If bus/slot is not specified, the first available PCI
+ device will be used.
+
+Only simple analog output writing is supported.
+
+So far it has only been tested with:
+ - PCI-DDA08/12
+Please report success/failure with other different cards to
+<comedi@comedi.org>.
+*/
+
+#include "../comedidev.h"
+
+#include "comedi_pci.h"
+#include "8255.h"
+
+#define PCI_VENDOR_ID_CB 0x1307 // PCI vendor number of ComputerBoards
+#define N_BOARDS 10 // Number of boards in cb_pcidda_boards
+#define EEPROM_SIZE 128 // number of entries in eeprom
+#define MAX_AO_CHANNELS 8 // maximum number of ao channels for supported boards
+
+/* PCI-DDA base addresses */
+#define DIGITALIO_BADRINDEX 2
+ // DIGITAL I/O is pci_dev->resource[2]
+#define DIGITALIO_SIZE 8
+ // DIGITAL I/O uses 8 I/O port addresses
+#define DAC_BADRINDEX 3
+ // DAC is pci_dev->resource[3]
+
+/* Digital I/O registers */
+#define PORT1A 0 // PORT 1A DATA
+
+#define PORT1B 1 // PORT 1B DATA
+
+#define PORT1C 2 // PORT 1C DATA
+
+#define CONTROL1 3 // CONTROL REGISTER 1
+
+#define PORT2A 4 // PORT 2A DATA
+
+#define PORT2B 5 // PORT 2B DATA
+
+#define PORT2C 6 // PORT 2C DATA
+
+#define CONTROL2 7 // CONTROL REGISTER 2
+
+/* DAC registers */
+#define DACONTROL 0 // D/A CONTROL REGISTER
+#define SU 0000001 // Simultaneous update enabled
+#define NOSU 0000000 // Simultaneous update disabled
+#define ENABLEDAC 0000002 // Enable specified DAC
+#define DISABLEDAC 0000000 // Disable specified DAC
+#define RANGE2V5 0000000 // 2.5V
+#define RANGE5V 0000200 // 5V
+#define RANGE10V 0000300 // 10V
+#define UNIP 0000400 // Unipolar outputs
+#define BIP 0000000 // Bipolar outputs
+
+#define DACALIBRATION1 4 // D/A CALIBRATION REGISTER 1
+//write bits
+#define SERIAL_IN_BIT 0x1 // serial data input for eeprom, caldacs, reference dac
+#define CAL_CHANNEL_MASK (0x7 << 1)
+#define CAL_CHANNEL_BITS(channel) (((channel) << 1) & CAL_CHANNEL_MASK)
+//read bits
+#define CAL_COUNTER_MASK 0x1f
+#define CAL_COUNTER_OVERFLOW_BIT 0x20 // calibration counter overflow status bit
+#define AO_BELOW_REF_BIT 0x40 // analog output is less than reference dac voltage
+#define SERIAL_OUT_BIT 0x80 // serial data out, for reading from eeprom
+
+#define DACALIBRATION2 6 // D/A CALIBRATION REGISTER 2
+#define SELECT_EEPROM_BIT 0x1 // send serial data in to eeprom
+#define DESELECT_REF_DAC_BIT 0x2 // don't send serial data to MAX542 reference dac
+#define DESELECT_CALDAC_BIT(n) (0x4 << (n)) // don't send serial data to caldac n
+#define DUMMY_BIT 0x40 // manual says to set this bit with no explanation
+
+#define DADATA 8 // FIRST D/A DATA REGISTER (0)
+
+static const struct comedi_lrange cb_pcidda_ranges = {
+ 6,
+ {
+ BIP_RANGE(10),
+ BIP_RANGE(5),
+ BIP_RANGE(2.5),
+ UNI_RANGE(10),
+ UNI_RANGE(5),
+ UNI_RANGE(2.5),
+ }
+};
+
+/*
+ * Board descriptions for two imaginary boards. Describing the
+ * boards in this way is optional, and completely driver-dependent.
+ * Some drivers use arrays such as this, other do not.
+ */
+struct cb_pcidda_board {
+ const char *name;
+ char status; // Driver status:
+ // 0 - tested
+ // 1 - manual read, not tested
+ // 2 - manual not read
+ unsigned short device_id;
+ int ao_chans;
+ int ao_bits;
+ const struct comedi_lrange *ranges;
+};
+static const struct cb_pcidda_board cb_pcidda_boards[] = {
+ {
+ name: "pci-dda02/12",
+ status: 1,
+ device_id:0x20,
+ ao_chans:2,
+ ao_bits: 12,
+ ranges: &cb_pcidda_ranges,
+ },
+ {
+ name: "pci-dda04/12",
+ status: 1,
+ device_id:0x21,
+ ao_chans:4,
+ ao_bits: 12,
+ ranges: &cb_pcidda_ranges,
+ },
+ {
+ name: "pci-dda08/12",
+ status: 0,
+ device_id:0x22,
+ ao_chans:8,
+ ao_bits: 12,
+ ranges: &cb_pcidda_ranges,
+ },
+ {
+ name: "pci-dda02/16",
+ status: 2,
+ device_id:0x23,
+ ao_chans:2,
+ ao_bits: 16,
+ ranges: &cb_pcidda_ranges,
+ },
+ {
+ name: "pci-dda04/16",
+ status: 2,
+ device_id:0x24,
+ ao_chans:4,
+ ao_bits: 16,
+ ranges: &cb_pcidda_ranges,
+ },
+ {
+ name: "pci-dda08/16",
+ status: 0,
+ device_id:0x25,
+ ao_chans:8,
+ ao_bits: 16,
+ ranges: &cb_pcidda_ranges,
+ },
+};
+
+static DEFINE_PCI_DEVICE_TABLE(cb_pcidda_pci_table) = {
+ {PCI_VENDOR_ID_CB, 0x0020, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {PCI_VENDOR_ID_CB, 0x0021, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {PCI_VENDOR_ID_CB, 0x0022, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {PCI_VENDOR_ID_CB, 0x0023, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {PCI_VENDOR_ID_CB, 0x0024, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {PCI_VENDOR_ID_CB, 0x0025, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {0}
+};
+
+MODULE_DEVICE_TABLE(pci, cb_pcidda_pci_table);
+
+/*
+ * Useful for shorthand access to the particular board structure
+ */
+#define thisboard ((const struct cb_pcidda_board *)dev->board_ptr)
+
+/* this structure is for data unique to this hardware driver. If
+ several hardware drivers keep similar information in this structure,
+ feel free to suggest moving the variable to the struct comedi_device struct. */
+struct cb_pcidda_private {
+ int data;
+
+ /* would be useful for a PCI device */
+ struct pci_dev *pci_dev;
+
+ unsigned long digitalio;
+ unsigned long dac;
+ //unsigned long control_status;
+ //unsigned long adc_fifo;
+ unsigned int dac_cal1_bits; // bits last written to da calibration register 1
+ unsigned int ao_range[MAX_AO_CHANNELS]; // current range settings for output channels
+ u16 eeprom_data[EEPROM_SIZE]; // software copy of board's eeprom
+};
+
+/*
+ * most drivers define the following macro to make it easy to
+ * access the private structure.
+ */
+#define devpriv ((struct cb_pcidda_private *)dev->private)
+
+static int cb_pcidda_attach(struct comedi_device * dev, struct comedi_devconfig * it);
+static int cb_pcidda_detach(struct comedi_device * dev);
+//static int cb_pcidda_ai_rinsn(struct comedi_device *dev,struct comedi_subdevice *s,struct comedi_insn *insn,unsigned int *data);
+static int cb_pcidda_ao_winsn(struct comedi_device * dev, struct comedi_subdevice * s,
+ struct comedi_insn * insn, unsigned int * data);
+//static int cb_pcidda_ai_cmd(struct comedi_device *dev,struct comedi_subdevice *s);
+//static int cb_pcidda_ai_cmdtest(struct comedi_device *dev,struct comedi_subdevice *s, struct comedi_cmd *cmd);
+//static int cb_pcidda_ns_to_timer(unsigned int *ns,int round);
+static unsigned int cb_pcidda_serial_in(struct comedi_device * dev);
+static void cb_pcidda_serial_out(struct comedi_device * dev, unsigned int value,
+ unsigned int num_bits);
+static unsigned int cb_pcidda_read_eeprom(struct comedi_device * dev,
+ unsigned int address);
+static void cb_pcidda_calibrate(struct comedi_device * dev, unsigned int channel,
+ unsigned int range);
+
+/*
+ * The struct comedi_driver structure tells the Comedi core module
+ * which functions to call to configure/deconfigure (attach/detach)
+ * the board, and also about the kernel module that contains
+ * the device code.
+ */
+static struct comedi_driver driver_cb_pcidda = {
+ driver_name:"cb_pcidda",
+ module:THIS_MODULE,
+ attach:cb_pcidda_attach,
+ detach:cb_pcidda_detach,
+};
+
+/*
+ * Attach is called by the Comedi core to configure the driver
+ * for a particular board.
+ */
+static int cb_pcidda_attach(struct comedi_device * dev, struct comedi_devconfig * it)
+{
+ struct comedi_subdevice *s;
+ struct pci_dev *pcidev;
+ int index;
+
+ printk("comedi%d: cb_pcidda: ", dev->minor);
+
+/*
+ * Allocate the private structure area.
+ */
+ if (alloc_private(dev, sizeof(struct cb_pcidda_private)) < 0)
+ return -ENOMEM;
+
+/*
+ * Probe the device to determine what device in the series it is.
+ */
+ printk("\n");
+
+ for (pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
+ pcidev != NULL;
+ pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pcidev)) {
+ if (pcidev->vendor == PCI_VENDOR_ID_CB) {
+ if (it->options[0] || it->options[1]) {
+ if (pcidev->bus->number != it->options[0] ||
+ PCI_SLOT(pcidev->devfn) !=
+ it->options[1]) {
+ continue;
+ }
+ }
+ for (index = 0; index < N_BOARDS; index++) {
+ if (cb_pcidda_boards[index].device_id ==
+ pcidev->device) {
+ goto found;
+ }
+ }
+ }
+ }
+ if (!pcidev) {
+ printk("Not a ComputerBoards/MeasurementComputing card on requested position\n");
+ return -EIO;
+ }
+ found:
+ devpriv->pci_dev = pcidev;
+ dev->board_ptr = cb_pcidda_boards + index;
+ // "thisboard" macro can be used from here.
+ printk("Found %s at requested position\n", thisboard->name);
+
+ /*
+ * Enable PCI device and request regions.
+ */
+ if (comedi_pci_enable(pcidev, thisboard->name)) {
+ printk("cb_pcidda: failed to enable PCI device and request regions\n");
+ return -EIO;
+ }
+
+/*
+ * Allocate the I/O ports.
+ */
+ devpriv->digitalio =
+ pci_resource_start(devpriv->pci_dev, DIGITALIO_BADRINDEX);
+ devpriv->dac = pci_resource_start(devpriv->pci_dev, DAC_BADRINDEX);
+
+/*
+ * Warn about the status of the driver.
+ */
+ if (thisboard->status == 2)
+ 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");
+
+/*
+ * Initialize dev->board_name.
+ */
+ dev->board_name = thisboard->name;
+
+/*
+ * Allocate the subdevice structures.
+ */
+ if (alloc_subdevices(dev, 3) < 0)
+ return -ENOMEM;
+
+ s = dev->subdevices + 0;
+ /* analog output subdevice */
+ s->type = COMEDI_SUBD_AO;
+ s->subdev_flags = SDF_WRITABLE;
+ s->n_chan = thisboard->ao_chans;
+ s->maxdata = (1 << thisboard->ao_bits) - 1;
+ s->range_table = thisboard->ranges;
+ s->insn_write = cb_pcidda_ao_winsn;
+// s->subdev_flags |= SDF_CMD_READ;
+// s->do_cmd = cb_pcidda_ai_cmd;
+// s->do_cmdtest = cb_pcidda_ai_cmdtest;
+
+ // two 8255 digital io subdevices
+ s = dev->subdevices + 1;
+ subdev_8255_init(dev, s, NULL, devpriv->digitalio);
+ s = dev->subdevices + 2;
+ subdev_8255_init(dev, s, NULL, devpriv->digitalio + PORT2A);
+
+ printk(" eeprom:");
+ for (index = 0; index < EEPROM_SIZE; index++) {
+ devpriv->eeprom_data[index] = cb_pcidda_read_eeprom(dev, index);
+ printk(" %i:0x%x ", index, devpriv->eeprom_data[index]);
+ }
+ printk("\n");
+
+ // set calibrations dacs
+ for (index = 0; index < thisboard->ao_chans; index++)
+ cb_pcidda_calibrate(dev, index, devpriv->ao_range[index]);
+
+ return 1;
+}
+
+/*
+ * _detach is called to deconfigure a device. It should deallocate
+ * resources.
+ * This function is also called when _attach() fails, so it should be
+ * careful not to release resources that were not necessarily
+ * allocated by _attach(). dev->private and dev->subdevices are
+ * deallocated automatically by the core.
+ */
+static int cb_pcidda_detach(struct comedi_device * dev)
+{
+/*
+ * Deallocate the I/O ports.
+ */
+ if (devpriv) {
+ if (devpriv->pci_dev) {
+ if (devpriv->dac) {
+ comedi_pci_disable(devpriv->pci_dev);
+ }
+ pci_dev_put(devpriv->pci_dev);
+ }
+ }
+ // cleanup 8255
+ if (dev->subdevices) {
+ subdev_8255_cleanup(dev, dev->subdevices + 1);
+ subdev_8255_cleanup(dev, dev->subdevices + 2);
+ }
+
+ printk("comedi%d: cb_pcidda: remove\n", dev->minor);
+
+ return 0;
+}
+
+/*
+ * I will program this later... ;-)
+ */
+#if 0
+static int cb_pcidda_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
+{
+ printk("cb_pcidda_ai_cmd\n");
+ printk("subdev: %d\n", cmd->subdev);
+ printk("flags: %d\n", cmd->flags);
+ printk("start_src: %d\n", cmd->start_src);
+ printk("start_arg: %d\n", cmd->start_arg);
+ printk("scan_begin_src: %d\n", cmd->scan_begin_src);
+ printk("convert_src: %d\n", cmd->convert_src);
+ printk("convert_arg: %d\n", cmd->convert_arg);
+ printk("scan_end_src: %d\n", cmd->scan_end_src);
+ printk("scan_end_arg: %d\n", cmd->scan_end_arg);
+ printk("stop_src: %d\n", cmd->stop_src);
+ printk("stop_arg: %d\n", cmd->stop_arg);
+ printk("chanlist_len: %d\n", cmd->chanlist_len);
+}
+#endif
+
+#if 0
+static int cb_pcidda_ai_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s,
+ struct comedi_cmd * cmd)
+{
+ int err = 0;
+ int tmp;
+
+ /* cmdtest tests a particular command to see if it is valid.
+ * Using the cmdtest ioctl, a user can create a valid cmd
+ * and then have it executes by the cmd ioctl.
+ *
+ * cmdtest returns 1,2,3,4 or 0, depending on which tests
+ * the command passes. */
+
+ /* step 1: make sure trigger sources are trivially valid */
+
+ tmp = cmd->start_src;
+ cmd->start_src &= TRIG_NOW;
+ if (!cmd->start_src || tmp != cmd->start_src)
+ err++;
+
+ tmp = cmd->scan_begin_src;
+ cmd->scan_begin_src &= TRIG_TIMER | TRIG_EXT;
+ if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
+ err++;
+
+ tmp = cmd->convert_src;
+ cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
+ if (!cmd->convert_src || tmp != cmd->convert_src)
+ err++;
+
+ tmp = cmd->scan_end_src;
+ cmd->scan_end_src &= TRIG_COUNT;
+ if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
+ err++;
+
+ tmp = cmd->stop_src;
+ cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
+ if (!cmd->stop_src || tmp != cmd->stop_src)
+ err++;
+
+ if (err)
+ return 1;
+
+ /* step 2: make sure trigger sources are unique and mutually compatible */
+
+ /* note that mutual compatiblity is not an issue here */
+ if (cmd->scan_begin_src != TRIG_TIMER
+ && cmd->scan_begin_src != TRIG_EXT)
+ err++;
+ if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
+ err++;
+ if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
+ err++;
+
+ if (err)
+ return 2;
+
+ /* step 3: make sure arguments are trivially compatible */
+
+ if (cmd->start_arg != 0) {
+ cmd->start_arg = 0;
+ err++;
+ }
+#define MAX_SPEED 10000 /* in nanoseconds */
+#define MIN_SPEED 1000000000 /* in nanoseconds */
+
+ if (cmd->scan_begin_src == TRIG_TIMER) {
+ if (cmd->scan_begin_arg < MAX_SPEED) {
+ cmd->scan_begin_arg = MAX_SPEED;
+ err++;
+ }
+ if (cmd->scan_begin_arg > MIN_SPEED) {
+ cmd->scan_begin_arg = MIN_SPEED;
+ err++;
+ }
+ } else {
+ /* external trigger */
+ /* should be level/edge, hi/lo specification here */
+ /* should specify multiple external triggers */
+ if (cmd->scan_begin_arg > 9) {
+ cmd->scan_begin_arg = 9;
+ err++;
+ }
+ }
+ if (cmd->convert_src == TRIG_TIMER) {
+ if (cmd->convert_arg < MAX_SPEED) {
+ cmd->convert_arg = MAX_SPEED;
+ err++;
+ }
+ if (cmd->convert_arg > MIN_SPEED) {
+ cmd->convert_arg = MIN_SPEED;
+ err++;
+ }
+ } else {
+ /* external trigger */
+ /* see above */
+ if (cmd->convert_arg > 9) {
+ cmd->convert_arg = 9;
+ err++;
+ }
+ }
+
+ if (cmd->scan_end_arg != cmd->chanlist_len) {
+ cmd->scan_end_arg = cmd->chanlist_len;
+ err++;
+ }
+ if (cmd->stop_src == TRIG_COUNT) {
+ if (cmd->stop_arg > 0x00ffffff) {
+ cmd->stop_arg = 0x00ffffff;
+ err++;
+ }
+ } else {
+ /* TRIG_NONE */
+ if (cmd->stop_arg != 0) {
+ cmd->stop_arg = 0;
+ err++;
+ }
+ }
+
+ if (err)
+ return 3;
+
+ /* step 4: fix up any arguments */
+
+ if (cmd->scan_begin_src == TRIG_TIMER) {
+ tmp = cmd->scan_begin_arg;
+ cb_pcidda_ns_to_timer(&cmd->scan_begin_arg,
+ cmd->flags & TRIG_ROUND_MASK);
+ if (tmp != cmd->scan_begin_arg)
+ err++;
+ }
+ if (cmd->convert_src == TRIG_TIMER) {
+ tmp = cmd->convert_arg;
+ cb_pcidda_ns_to_timer(&cmd->convert_arg,
+ cmd->flags & TRIG_ROUND_MASK);
+ if (tmp != cmd->convert_arg)
+ err++;
+ if (cmd->scan_begin_src == TRIG_TIMER &&
+ cmd->scan_begin_arg <
+ cmd->convert_arg * cmd->scan_end_arg) {
+ cmd->scan_begin_arg =
+ cmd->convert_arg * cmd->scan_end_arg;
+ err++;
+ }
+ }
+
+ if (err)
+ return 4;
+
+ return 0;
+}
+#endif
+
+/* This function doesn't require a particular form, this is just
+ * what happens to be used in some of the drivers. It should
+ * convert ns nanoseconds to a counter value suitable for programming
+ * the device. Also, it should adjust ns so that it cooresponds to
+ * the actual time that the device will use. */
+#if 0
+static int cb_pcidda_ns_to_timer(unsigned int *ns, int round)
+{
+ /* trivial timer */
+ return *ns;
+}
+#endif
+
+static int cb_pcidda_ao_winsn(struct comedi_device * dev, struct comedi_subdevice * s,
+ struct comedi_insn * insn, unsigned int * data)
+{
+ unsigned int command;
+ unsigned int channel, range;
+
+ channel = CR_CHAN(insn->chanspec);
+ range = CR_RANGE(insn->chanspec);
+
+ // adjust calibration dacs if range has changed
+ if (range != devpriv->ao_range[channel])
+ cb_pcidda_calibrate(dev, channel, range);
+
+ /* output channel configuration */
+ command = NOSU | ENABLEDAC;
+
+ /* output channel range */
+ switch (range) {
+ case 0:
+ command |= BIP | RANGE10V;
+ break;
+ case 1:
+ command |= BIP | RANGE5V;
+ break;
+ case 2:
+ command |= BIP | RANGE2V5;
+ break;
+ case 3:
+ command |= UNIP | RANGE10V;
+ break;
+ case 4:
+ command |= UNIP | RANGE5V;
+ break;
+ case 5:
+ command |= UNIP | RANGE2V5;
+ break;
+ };
+
+ /* output channel specification */
+ command |= channel << 2;
+ outw(command, devpriv->dac + DACONTROL);
+
+ /* write data */
+ outw(data[0], devpriv->dac + DADATA + channel * 2);
+
+ /* return the number of samples read/written */
+ return 1;
+}
+
+// lowlevel read from eeprom
+static unsigned int cb_pcidda_serial_in(struct comedi_device * dev)
+{
+ unsigned int value = 0;
+ int i;
+ const int value_width = 16; // number of bits wide values are
+
+ for (i = 1; i <= value_width; i++) {
+ // read bits most significant bit first
+ if (inw_p(devpriv->dac + DACALIBRATION1) & SERIAL_OUT_BIT) {
+ value |= 1 << (value_width - i);
+ }
+ }
+
+ return value;
+}
+
+// lowlevel write to eeprom/dac
+static void cb_pcidda_serial_out(struct comedi_device * dev, unsigned int value,
+ unsigned int num_bits)
+{
+ int i;
+
+ for (i = 1; i <= num_bits; i++) {
+ // send bits most significant bit first
+ if (value & (1 << (num_bits - i)))
+ devpriv->dac_cal1_bits |= SERIAL_IN_BIT;
+ else
+ devpriv->dac_cal1_bits &= ~SERIAL_IN_BIT;
+ outw_p(devpriv->dac_cal1_bits, devpriv->dac + DACALIBRATION1);
+ }
+}
+
+// reads a 16 bit value from board's eeprom
+static unsigned int cb_pcidda_read_eeprom(struct comedi_device * dev,
+ unsigned int address)
+{
+ unsigned int i;
+ unsigned int cal2_bits;
+ unsigned int value;
+ const int max_num_caldacs = 4; // one caldac for every two dac channels
+ const int read_instruction = 0x6; // bits to send to tell eeprom we want to read
+ const int instruction_length = 3;
+ const int address_length = 8;
+
+ // send serial output stream to eeprom
+ cal2_bits = SELECT_EEPROM_BIT | DESELECT_REF_DAC_BIT | DUMMY_BIT;
+ // deactivate caldacs (one caldac for every two channels)
+ for (i = 0; i < max_num_caldacs; i++) {
+ cal2_bits |= DESELECT_CALDAC_BIT(i);
+ }
+ outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
+
+ // tell eeprom we want to read
+ cb_pcidda_serial_out(dev, read_instruction, instruction_length);
+ // send address we want to read from
+ cb_pcidda_serial_out(dev, address, address_length);
+
+ value = cb_pcidda_serial_in(dev);
+
+ // deactivate eeprom
+ cal2_bits &= ~SELECT_EEPROM_BIT;
+ outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
+
+ return value;
+}
+
+// writes to 8 bit calibration dacs
+static void cb_pcidda_write_caldac(struct comedi_device * dev, unsigned int caldac,
+ unsigned int channel, unsigned int value)
+{
+ unsigned int cal2_bits;
+ unsigned int i;
+ const int num_channel_bits = 3; // caldacs use 3 bit channel specification
+ const int num_caldac_bits = 8; // 8 bit calibration dacs
+ const int max_num_caldacs = 4; // one caldac for every two dac channels
+
+ /* write 3 bit channel */
+ cb_pcidda_serial_out(dev, channel, num_channel_bits);
+ // write 8 bit caldac value
+ cb_pcidda_serial_out(dev, value, num_caldac_bits);
+
+ // latch stream into appropriate caldac
+ // deselect reference dac
+ cal2_bits = DESELECT_REF_DAC_BIT | DUMMY_BIT;
+ // deactivate caldacs (one caldac for every two channels)
+ for (i = 0; i < max_num_caldacs; i++) {
+ cal2_bits |= DESELECT_CALDAC_BIT(i);
+ }
+ // activate the caldac we want
+ cal2_bits &= ~DESELECT_CALDAC_BIT(caldac);
+ outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
+ // deactivate caldac
+ cal2_bits |= DESELECT_CALDAC_BIT(caldac);
+ outw_p(cal2_bits, devpriv->dac + DACALIBRATION2);
+}
+
+// returns caldac that calibrates given analog out channel
+static unsigned int caldac_number(unsigned int channel)
+{
+ return channel / 2;
+}
+
+// returns caldac channel that provides fine gain for given ao channel
+static unsigned int fine_gain_channel(unsigned int ao_channel)
+{
+ return 4 * (ao_channel % 2);
+}
+
+// returns caldac channel that provides coarse gain for given ao channel
+static unsigned int coarse_gain_channel(unsigned int ao_channel)
+{
+ return 1 + 4 * (ao_channel % 2);
+}
+
+// returns caldac channel that provides coarse offset for given ao channel
+static unsigned int coarse_offset_channel(unsigned int ao_channel)
+{
+ return 2 + 4 * (ao_channel % 2);
+}
+
+// returns caldac channel that provides fine offset for given ao channel
+static unsigned int fine_offset_channel(unsigned int ao_channel)
+{
+ return 3 + 4 * (ao_channel % 2);
+}
+
+// returns eeprom address that provides offset for given ao channel and range
+static unsigned int offset_eeprom_address(unsigned int ao_channel,
+ unsigned int range)
+{
+ return 0x7 + 2 * range + 12 * ao_channel;
+}
+
+// returns eeprom address that provides gain calibration for given ao channel and range
+static unsigned int gain_eeprom_address(unsigned int ao_channel,
+ unsigned int range)
+{
+ return 0x8 + 2 * range + 12 * ao_channel;
+}
+
+// returns upper byte of eeprom entry, which gives the coarse adjustment values
+static unsigned int eeprom_coarse_byte(unsigned int word)
+{
+ return (word >> 8) & 0xff;
+}
+
+// returns lower byte of eeprom entry, which gives the fine adjustment values
+static unsigned int eeprom_fine_byte(unsigned int word)
+{
+ return word & 0xff;
+}
+
+// set caldacs to eeprom values for given channel and range
+static void cb_pcidda_calibrate(struct comedi_device * dev, unsigned int channel,
+ unsigned int range)
+{
+ unsigned int coarse_offset, fine_offset, coarse_gain, fine_gain;
+
+ // remember range so we can tell when we need to readjust calibration
+ devpriv->ao_range[channel] = range;
+
+ // get values from eeprom data
+ coarse_offset =
+ eeprom_coarse_byte(devpriv->
+ eeprom_data[offset_eeprom_address(channel, range)]);
+ fine_offset =
+ eeprom_fine_byte(devpriv->
+ eeprom_data[offset_eeprom_address(channel, range)]);
+ coarse_gain =
+ eeprom_coarse_byte(devpriv->
+ eeprom_data[gain_eeprom_address(channel, range)]);
+ fine_gain =
+ eeprom_fine_byte(devpriv->
+ eeprom_data[gain_eeprom_address(channel, range)]);
+
+ // set caldacs
+ cb_pcidda_write_caldac(dev, caldac_number(channel),
+ coarse_offset_channel(channel), coarse_offset);
+ cb_pcidda_write_caldac(dev, caldac_number(channel),
+ fine_offset_channel(channel), fine_offset);
+ cb_pcidda_write_caldac(dev, caldac_number(channel),
+ coarse_gain_channel(channel), coarse_gain);
+ cb_pcidda_write_caldac(dev, caldac_number(channel),
+ fine_gain_channel(channel), fine_gain);
+}
+
+/*
+ * A convenient macro that defines init_module() and cleanup_module(),
+ * as necessary.
+ */
+COMEDI_PCI_INITCLEANUP(driver_cb_pcidda, cb_pcidda_pci_table);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.