--- /dev/null
+/*
+ comedi/drivers/cb_pcimdda.c
+ Computer Boards PCIM-DDA06-16 Comedi driver
+ Author: Calin Culianu <calin@ajvar.org>
+
+ COMEDI - Linux Control and Measurement Device Interface
+ Copyright (C) 2000 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_pcimdda
+Description: Measurement Computing PCIM-DDA06-16
+Devices: [Measurement Computing] PCIM-DDA06-16 (cb_pcimdda)
+Author: Calin Culianu <calin@ajvar.org>
+Updated: Mon, 14 Apr 2008 15:15:51 +0100
+Status: works
+
+All features of the PCIM-DDA06-16 board are supported. This board
+has 6 16-bit AO channels, and the usual 8255 DIO setup. (24 channels,
+configurable in banks of 8 and 4, etc.). This board does not support commands.
+
+The board has a peculiar way of specifying AO gain/range settings -- You have
+1 jumper bank on the card, which either makes all 6 AO channels either
+5 Volt unipolar, 5V bipolar, 10 Volt unipolar or 10V bipolar.
+
+Since there is absolutely _no_ way to tell in software how this jumper is set
+(well, at least according to the rather thin spec. from Measurement Computing
+ that comes with the board), the driver assumes the jumper is at its factory
+default setting of +/-5V.
+
+Also of note is the fact that this board features another jumper, whose
+state is also completely invisible to software. It toggles two possible AO
+output modes on the board:
+
+ - Update Mode: Writing to an AO channel instantaneously updates the actual
+ signal output by the DAC on the board (this is the factory default).
+ - Simultaneous XFER Mode: Writing to an AO channel has no effect until
+ you read from any one of the AO channels. This is useful for loading
+ all 6 AO values, and then reading from any one of the AO channels on the
+ device to instantly update all 6 AO values in unison. Useful for some
+ control apps, I would assume? If your jumper is in this setting, then you
+ need to issue your comedi_data_write()s to load all the values you want,
+ then issue one comedi_data_read() on any channel on the AO subdevice
+ to initiate the simultaneous XFER.
+
+Configuration Options:
+ [0] PCI bus (optional)
+ [1] PCI slot (optional)
+ [2] analog output range jumper setting
+ 0 == +/- 5 V
+ 1 == +/- 10 V
+*/
+
+/*
+ This is a driver for the Computer Boards PCIM-DDA06-16 Analog Output
+ card. This board has a unique register layout and as such probably
+ deserves its own driver file.
+
+ It is theoretically possible to integrate this board into the cb_pcidda
+ file, but since that isn't my code, I didn't want to significantly
+ modify that file to support this board (I thought it impolite to do so).
+
+ At any rate, if you feel ambitious, please feel free to take
+ the code out of this file and combine it with a more unified driver
+ file.
+
+ I would like to thank Timothy Curry <Timothy.Curry@rdec.redstone.army.mil>
+ for lending me a board so that I could write this driver.
+
+ -Calin Culianu <calin@ajvar.org>
+ */
+
+#include "../comedidev.h"
+
+#include "comedi_pci.h"
+
+#include "8255.h"
+
+/* device ids of the cards we support -- currently only 1 card supported */
+#define PCI_ID_PCIM_DDA06_16 0x0053
+
+/*
+ * This is straight from skel.c -- I did this in case this source file
+ * will someday support more than 1 board...
+ */
+typedef struct board_struct {
+ const char *name;
+ unsigned short device_id;
+ int ao_chans;
+ int ao_bits;
+ int dio_chans;
+ int dio_method;
+ int dio_offset; /* how many bytes into the BADR are the DIO ports */
+ int regs_badrindex; /* IO Region for the control, analog output,
+ and DIO registers */
+ int reg_sz; /* number of bytes of registers in io region */
+} board;
+
+enum DIO_METHODS {
+ DIO_NONE = 0,
+ DIO_8255,
+ DIO_INTERNAL /* unimplemented */
+};
+
+static const board boards[] = {
+ {
+ name: "cb_pcimdda06-16",
+ device_id:PCI_ID_PCIM_DDA06_16,
+ ao_chans:6,
+ ao_bits: 16,
+ dio_chans:24,
+ dio_method:DIO_8255,
+ dio_offset:12,
+ regs_badrindex:3,
+ reg_sz: 16,
+ }
+};
+
+/*
+ * Useful for shorthand access to the particular board structure
+ */
+#define thisboard ((const board *)dev->board_ptr)
+
+/* Number of boards in boards[] */
+#define N_BOARDS (sizeof(boards) / sizeof(board))
+#define REG_SZ (thisboard->reg_sz)
+#define REGS_BADRINDEX (thisboard->regs_badrindex)
+
+/* This is used by modprobe to translate PCI IDs to drivers. Should
+ * only be used for PCI and ISA-PnP devices */
+/* Please add your PCI vendor ID to comedidev.h, and it will be forwarded
+ * upstream. */
+static DEFINE_PCI_DEVICE_TABLE(pci_table) = {
+ {PCI_VENDOR_ID_COMPUTERBOARDS, PCI_ID_PCIM_DDA06_16, PCI_ANY_ID,
+ PCI_ANY_ID, 0, 0, 0},
+ {0}
+};
+
+MODULE_DEVICE_TABLE(pci, pci_table);
+
+/* 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 comedi_device struct. */
+typedef struct {
+ unsigned long registers; /* set by probe */
+ unsigned long dio_registers;
+ char attached_to_8255; /* boolean */
+ char attached_successfully; /* boolean */
+ /* would be useful for a PCI device */
+ struct pci_dev *pci_dev;
+
+#define MAX_AO_READBACK_CHANNELS 6
+ /* Used for AO readback */
+ lsampl_t ao_readback[MAX_AO_READBACK_CHANNELS];
+
+} private;
+
+/*
+ * most drivers define the following macro to make it easy to
+ * access the private structure.
+ */
+#define devpriv ((private *)dev->private)
+
+/*
+ * The 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 int attach(comedi_device * dev, comedi_devconfig * it);
+static int detach(comedi_device * dev);
+static comedi_driver cb_pcimdda_driver = {
+ driver_name:"cb_pcimdda",
+ module:THIS_MODULE,
+ attach:attach,
+ detach:detach,
+};
+
+MODULE_AUTHOR("Calin A. Culianu <calin@rtlab.org>");
+MODULE_DESCRIPTION("Comedi low-level driver for the Computerboards PCIM-DDA "
+ "series. Currently only supports PCIM-DDA06-16 (which "
+ "also happens to be the only board in this series. :) ) ");
+MODULE_LICENSE("GPL");
+COMEDI_PCI_INITCLEANUP_NOMODULE(cb_pcimdda_driver, pci_table);
+
+static int ao_winsn(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data);
+static int ao_rinsn(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data);
+
+/*---------------------------------------------------------------------------
+ HELPER FUNCTION DECLARATIONS
+-----------------------------------------------------------------------------*/
+
+/* returns a maxdata value for a given n_bits */
+static inline lsampl_t figure_out_maxdata(int bits)
+{
+ return (((lsampl_t) 1 << bits) - 1);
+}
+
+/*
+ * Probes for a supported device.
+ *
+ * Prerequisite: private be allocated already inside dev
+ *
+ * If the device is found, it returns 0 and has the following side effects:
+ *
+ * o assigns a struct pci_dev * to dev->private->pci_dev
+ * o assigns a struct board * to dev->board_ptr
+ * o sets dev->private->registers
+ * o sets dev->private->dio_registers
+ *
+ * Otherwise, returns a -errno on error
+ */
+static int probe(comedi_device * dev, const comedi_devconfig * it);
+
+/*---------------------------------------------------------------------------
+ FUNCTION DEFINITIONS
+-----------------------------------------------------------------------------*/
+
+/*
+ * Attach is called by the Comedi core to configure the driver
+ * for a particular board. If you specified a board_name array
+ * in the driver structure, dev->board_ptr contains that
+ * address.
+ */
+static int attach(comedi_device * dev, comedi_devconfig * it)
+{
+ comedi_subdevice *s;
+ int err;
+
+/*
+ * Allocate the private structure area. alloc_private() is a
+ * convenient macro defined in comedidev.h.
+ * if this function fails (returns negative) then the private area is
+ * kfree'd by comedi
+ */
+ if (alloc_private(dev, sizeof(private)) < 0)
+ return -ENOMEM;
+
+/*
+ * If you can probe the device to determine what device in a series
+ * it is, this is the place to do it. Otherwise, dev->board_ptr
+ * should already be initialized.
+ */
+ if ((err = probe(dev, it)))
+ return err;
+
+/* Output some info */
+ printk("comedi%d: %s: ", dev->minor, thisboard->name);
+
+/*
+ * Initialize dev->board_name. Note that we can use the "thisboard"
+ * macro now, since we just initialized it in the last line.
+ */
+ dev->board_name = thisboard->name;
+
+/*
+ * Allocate the subdevice structures. alloc_subdevice() is a
+ * convenient macro defined in comedidev.h.
+ */
+ if (alloc_subdevices(dev, 2) < 0)
+ return -ENOMEM;
+
+ s = dev->subdevices + 0;
+
+ /* analog output subdevice */
+ s->type = COMEDI_SUBD_AO;
+ s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
+ s->n_chan = thisboard->ao_chans;
+ s->maxdata = figure_out_maxdata(thisboard->ao_bits);
+ /* this is hard-coded here */
+ if (it->options[2]) {
+ s->range_table = &range_bipolar10;
+ } else {
+ s->range_table = &range_bipolar5;
+ }
+ s->insn_write = &ao_winsn;
+ s->insn_read = &ao_rinsn;
+
+ s = dev->subdevices + 1;
+ /* digital i/o subdevice */
+ if (thisboard->dio_chans) {
+ switch (thisboard->dio_method) {
+ case DIO_8255:
+ /* this is a straight 8255, so register us with the 8255 driver */
+ subdev_8255_init(dev, s, NULL, devpriv->dio_registers);
+ devpriv->attached_to_8255 = 1;
+ break;
+ case DIO_INTERNAL:
+ default:
+ printk("DIO_INTERNAL not implemented yet!\n");
+ return -ENXIO;
+ break;
+ }
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
+ devpriv->attached_successfully = 1;
+
+ printk("attached\n");
+
+ 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 detach(comedi_device * dev)
+{
+ if (devpriv) {
+
+ if (dev->subdevices && devpriv->attached_to_8255) {
+ /* de-register us from the 8255 driver */
+ subdev_8255_cleanup(dev, dev->subdevices + 2);
+ devpriv->attached_to_8255 = 0;
+ }
+
+ if (devpriv->pci_dev) {
+ if (devpriv->registers) {
+ comedi_pci_disable(devpriv->pci_dev);
+ }
+ pci_dev_put(devpriv->pci_dev);
+ }
+
+ if (devpriv->attached_successfully && thisboard)
+ printk("comedi%d: %s: detached\n", dev->minor,
+ thisboard->name);
+
+ }
+
+ return 0;
+}
+
+static int ao_winsn(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+ int i;
+ int chan = CR_CHAN(insn->chanspec);
+ unsigned long offset = devpriv->registers + chan * 2;
+
+ /* Writing a list of values to an AO channel is probably not
+ * very useful, but that's how the interface is defined. */
+ for (i = 0; i < insn->n; i++) {
+ /* first, load the low byte */
+ outb((char)(data[i] & 0x00ff), offset);
+ /* next, write the high byte -- only after this is written is
+ the channel voltage updated in the DAC, unless
+ we're in simultaneous xfer mode (jumper on card)
+ then a rinsn is necessary to actually update the DAC --
+ see ao_rinsn() below... */
+ outb((char)(data[i] >> 8 & 0x00ff), offset + 1);
+
+ /* for testing only.. the actual rinsn SHOULD do an inw!
+ (see the stuff about simultaneous XFER mode on this board) */
+ devpriv->ao_readback[chan] = data[i];
+ }
+
+ /* return the number of samples read/written */
+ return i;
+}
+
+/* AO subdevices should have a read insn as well as a write insn.
+
+ Usually this means copying a value stored in devpriv->ao_readback.
+ However, since this board has this jumper setting called "Simultaneous
+ Xfer mode" (off by default), we will support it. Simultaneaous xfer
+ mode is accomplished by loading ALL the values you want for AO in all the
+ channels, then READing off one of the AO registers to initiate the
+ instantaneous simultaneous update of all DAC outputs, which makes
+ all AO channels update simultaneously. This is useful for some control
+ applications, I would imagine.
+*/
+static int ao_rinsn(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+ int i;
+ int chan = CR_CHAN(insn->chanspec);
+
+ for (i = 0; i < insn->n; i++) {
+ inw(devpriv->registers + chan * 2);
+ /* should I set data[i] to the result of the actual read on the register
+ or the cached lsampl_t in devpriv->ao_readback[]? */
+ data[i] = devpriv->ao_readback[chan];
+ }
+
+ return i;
+}
+
+/*---------------------------------------------------------------------------
+ HELPER FUNCTION DEFINITIONS
+-----------------------------------------------------------------------------*/
+
+/*
+ * Probes for a supported device.
+ *
+ * Prerequisite: private be allocated already inside dev
+ *
+ * If the device is found, it returns 0 and has the following side effects:
+ *
+ * o assigns a struct pci_dev * to dev->private->pci_dev
+ * o assigns a struct board * to dev->board_ptr
+ * o sets dev->private->registers
+ * o sets dev->private->dio_registers
+ *
+ * Otherwise, returns a -errno on error
+ */
+static int probe(comedi_device * dev, const comedi_devconfig * it)
+{
+ struct pci_dev *pcidev;
+ int index;
+ unsigned long registers;
+
+ 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)) {
+ // is it not a computer boards card?
+ if (pcidev->vendor != PCI_VENDOR_ID_COMPUTERBOARDS)
+ continue;
+ // loop through cards supported by this driver
+ for (index = 0; index < N_BOARDS; index++) {
+ if (boards[index].device_id != pcidev->device)
+ continue;
+ // was a particular bus/slot requested?
+ if (it->options[0] || it->options[1]) {
+ // are we on the wrong bus/slot?
+ if (pcidev->bus->number != it->options[0] ||
+ PCI_SLOT(pcidev->devfn) !=
+ it->options[1]) {
+ continue;
+ }
+ }
+ /* found ! */
+
+ devpriv->pci_dev = pcidev;
+ dev->board_ptr = boards + index;
+ if (comedi_pci_enable(pcidev, thisboard->name)) {
+ printk("cb_pcimdda: Failed to enable PCI device and request regions\n");
+ return -EIO;
+ }
+ registers =
+ pci_resource_start(devpriv->pci_dev,
+ REGS_BADRINDEX);
+ devpriv->registers = registers;
+ devpriv->dio_registers
+ = devpriv->registers + thisboard->dio_offset;
+ return 0;
+ }
+ }
+
+ printk("cb_pcimdda: No supported ComputerBoards/MeasurementComputing "
+ "card found at the requested position\n");
+ return -ENODEV;
+}
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff