linux/drivers/staging/comedi/drivers/addi_apci_1032.c
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   1/*
   2 * addi_apci_1032.c
   3 * Copyright (C) 2004,2005  ADDI-DATA GmbH for the source code of this module.
   4 * Project manager: Eric Stolz
   5 *
   6 *      ADDI-DATA GmbH
   7 *      Dieselstrasse 3
   8 *      D-77833 Ottersweier
   9 *      Tel: +19(0)7223/9493-0
  10 *      Fax: +49(0)7223/9493-92
  11 *      http://www.addi-data.com
  12 *      info@addi-data.com
  13 *
  14 * This program is free software; you can redistribute it and/or modify it
  15 * under the terms of the GNU General Public License as published by the
  16 * Free Software Foundation; either version 2 of the License, or (at your
  17 * option) any later version.
  18 *
  19 * This program is distributed in the hope that it will be useful, but WITHOUT
  20 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  21 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  22 * more details.
  23 */
  24
  25/*
  26 * Driver: addi_apci_1032
  27 * Description: ADDI-DATA APCI-1032 Digital Input Board
  28 * Author: ADDI-DATA GmbH <info@addi-data.com>,
  29 *   H Hartley Sweeten <hsweeten@visionengravers.com>
  30 * Status: untested
  31 * Devices: [ADDI-DATA] APCI-1032 (addi_apci_1032)
  32 *
  33 * Configuration options:
  34 *   None; devices are configured automatically.
  35 *
  36 * This driver models the APCI-1032 as a 32-channel, digital input subdevice
  37 * plus an additional digital input subdevice to handle change-of-state (COS)
  38 * interrupts (if an interrupt handler can be set up successfully).
  39 *
  40 * The COS subdevice supports comedi asynchronous read commands.
  41 *
  42 * Change-Of-State (COS) interrupt configuration:
  43 *
  44 * Channels 0 to 15 are interruptible. These channels can be configured
  45 * to generate interrupts based on AND/OR logic for the desired channels.
  46 *
  47 *   OR logic:
  48 *   - reacts to rising or falling edges
  49 *   - interrupt is generated when any enabled channel meets the desired
  50 *     interrupt condition
  51 *
  52 *   AND logic:
  53 *   - reacts to changes in level of the selected inputs
  54 *   - interrupt is generated when all enabled channels meet the desired
  55 *     interrupt condition
  56 *   - after an interrupt, a change in level must occur on the selected
  57 *     inputs to release the IRQ logic
  58 *
  59 * The COS subdevice must be configured before setting up a comedi
  60 * asynchronous command:
  61 *
  62 *   data[0] : INSN_CONFIG_DIGITAL_TRIG
  63 *   data[1] : trigger number (= 0)
  64 *   data[2] : configuration operation:
  65 *             - COMEDI_DIGITAL_TRIG_DISABLE = no interrupts
  66 *             - COMEDI_DIGITAL_TRIG_ENABLE_EDGES = OR (edge) interrupts
  67 *             - COMEDI_DIGITAL_TRIG_ENABLE_LEVELS = AND (level) interrupts
  68 *   data[3] : left-shift for data[4] and data[5]
  69 *   data[4] : rising-edge/high level channels
  70 *   data[5] : falling-edge/low level channels
  71 */
  72
  73#include <linux/module.h>
  74#include <linux/interrupt.h>
  75
  76#include "../comedi_pci.h"
  77#include "amcc_s5933.h"
  78
  79/*
  80 * I/O Register Map
  81 */
  82#define APCI1032_DI_REG                 0x00
  83#define APCI1032_MODE1_REG              0x04
  84#define APCI1032_MODE2_REG              0x08
  85#define APCI1032_STATUS_REG             0x0c
  86#define APCI1032_CTRL_REG               0x10
  87#define APCI1032_CTRL_INT_MODE(x)       (((x) & 0x1) << 1)
  88#define APCI1032_CTRL_INT_OR            APCI1032_CTRL_INT_MODE(0)
  89#define APCI1032_CTRL_INT_AND           APCI1032_CTRL_INT_MODE(1)
  90#define APCI1032_CTRL_INT_ENA           BIT(2)
  91
  92struct apci1032_private {
  93        unsigned long amcc_iobase;      /* base of AMCC I/O registers */
  94        unsigned int mode1;     /* rising-edge/high level channels */
  95        unsigned int mode2;     /* falling-edge/low level channels */
  96        unsigned int ctrl;      /* interrupt mode OR (edge) . AND (level) */
  97};
  98
  99static int apci1032_reset(struct comedi_device *dev)
 100{
 101        /* disable the interrupts */
 102        outl(0x0, dev->iobase + APCI1032_CTRL_REG);
 103        /* Reset the interrupt status register */
 104        inl(dev->iobase + APCI1032_STATUS_REG);
 105        /* Disable the and/or interrupt */
 106        outl(0x0, dev->iobase + APCI1032_MODE1_REG);
 107        outl(0x0, dev->iobase + APCI1032_MODE2_REG);
 108
 109        return 0;
 110}
 111
 112static int apci1032_cos_insn_config(struct comedi_device *dev,
 113                                    struct comedi_subdevice *s,
 114                                    struct comedi_insn *insn,
 115                                    unsigned int *data)
 116{
 117        struct apci1032_private *devpriv = dev->private;
 118        unsigned int shift, oldmask;
 119
 120        switch (data[0]) {
 121        case INSN_CONFIG_DIGITAL_TRIG:
 122                if (data[1] != 0)
 123                        return -EINVAL;
 124                shift = data[3];
 125                oldmask = (1U << shift) - 1;
 126                switch (data[2]) {
 127                case COMEDI_DIGITAL_TRIG_DISABLE:
 128                        devpriv->ctrl = 0;
 129                        devpriv->mode1 = 0;
 130                        devpriv->mode2 = 0;
 131                        apci1032_reset(dev);
 132                        break;
 133                case COMEDI_DIGITAL_TRIG_ENABLE_EDGES:
 134                        if (devpriv->ctrl != (APCI1032_CTRL_INT_ENA |
 135                                              APCI1032_CTRL_INT_OR)) {
 136                                /* switching to 'OR' mode */
 137                                devpriv->ctrl = APCI1032_CTRL_INT_ENA |
 138                                                APCI1032_CTRL_INT_OR;
 139                                /* wipe old channels */
 140                                devpriv->mode1 = 0;
 141                                devpriv->mode2 = 0;
 142                        } else {
 143                                /* preserve unspecified channels */
 144                                devpriv->mode1 &= oldmask;
 145                                devpriv->mode2 &= oldmask;
 146                        }
 147                        /* configure specified channels */
 148                        devpriv->mode1 |= data[4] << shift;
 149                        devpriv->mode2 |= data[5] << shift;
 150                        break;
 151                case COMEDI_DIGITAL_TRIG_ENABLE_LEVELS:
 152                        if (devpriv->ctrl != (APCI1032_CTRL_INT_ENA |
 153                                              APCI1032_CTRL_INT_AND)) {
 154                                /* switching to 'AND' mode */
 155                                devpriv->ctrl = APCI1032_CTRL_INT_ENA |
 156                                                APCI1032_CTRL_INT_AND;
 157                                /* wipe old channels */
 158                                devpriv->mode1 = 0;
 159                                devpriv->mode2 = 0;
 160                        } else {
 161                                /* preserve unspecified channels */
 162                                devpriv->mode1 &= oldmask;
 163                                devpriv->mode2 &= oldmask;
 164                        }
 165                        /* configure specified channels */
 166                        devpriv->mode1 |= data[4] << shift;
 167                        devpriv->mode2 |= data[5] << shift;
 168                        break;
 169                default:
 170                        return -EINVAL;
 171                }
 172                break;
 173        default:
 174                return -EINVAL;
 175        }
 176
 177        return insn->n;
 178}
 179
 180static int apci1032_cos_insn_bits(struct comedi_device *dev,
 181                                  struct comedi_subdevice *s,
 182                                  struct comedi_insn *insn,
 183                                  unsigned int *data)
 184{
 185        data[1] = s->state;
 186
 187        return 0;
 188}
 189
 190static int apci1032_cos_cmdtest(struct comedi_device *dev,
 191                                struct comedi_subdevice *s,
 192                                struct comedi_cmd *cmd)
 193{
 194        int err = 0;
 195
 196        /* Step 1 : check if triggers are trivially valid */
 197
 198        err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
 199        err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
 200        err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW);
 201        err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
 202        err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_NONE);
 203
 204        if (err)
 205                return 1;
 206
 207        /* Step 2a : make sure trigger sources are unique */
 208        /* Step 2b : and mutually compatible */
 209
 210        /* Step 3: check if arguments are trivially valid */
 211
 212        err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
 213        err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
 214        err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
 215        err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
 216                                           cmd->chanlist_len);
 217        err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
 218
 219        if (err)
 220                return 3;
 221
 222        /* Step 4: fix up any arguments */
 223
 224        /* Step 5: check channel list if it exists */
 225
 226        return 0;
 227}
 228
 229/*
 230 * Change-Of-State (COS) 'do_cmd' operation
 231 *
 232 * Enable the COS interrupt as configured by apci1032_cos_insn_config().
 233 */
 234static int apci1032_cos_cmd(struct comedi_device *dev,
 235                            struct comedi_subdevice *s)
 236{
 237        struct apci1032_private *devpriv = dev->private;
 238
 239        if (!devpriv->ctrl) {
 240                dev_warn(dev->class_dev,
 241                         "Interrupts disabled due to mode configuration!\n");
 242                return -EINVAL;
 243        }
 244
 245        outl(devpriv->mode1, dev->iobase + APCI1032_MODE1_REG);
 246        outl(devpriv->mode2, dev->iobase + APCI1032_MODE2_REG);
 247        outl(devpriv->ctrl, dev->iobase + APCI1032_CTRL_REG);
 248
 249        return 0;
 250}
 251
 252static int apci1032_cos_cancel(struct comedi_device *dev,
 253                               struct comedi_subdevice *s)
 254{
 255        return apci1032_reset(dev);
 256}
 257
 258static irqreturn_t apci1032_interrupt(int irq, void *d)
 259{
 260        struct comedi_device *dev = d;
 261        struct apci1032_private *devpriv = dev->private;
 262        struct comedi_subdevice *s = dev->read_subdev;
 263        unsigned int ctrl;
 264
 265        /* check interrupt is from this device */
 266        if ((inl(devpriv->amcc_iobase + AMCC_OP_REG_INTCSR) &
 267             INTCSR_INTR_ASSERTED) == 0)
 268                return IRQ_NONE;
 269
 270        /* check interrupt is enabled */
 271        ctrl = inl(dev->iobase + APCI1032_CTRL_REG);
 272        if ((ctrl & APCI1032_CTRL_INT_ENA) == 0)
 273                return IRQ_HANDLED;
 274
 275        /* disable the interrupt */
 276        outl(ctrl & ~APCI1032_CTRL_INT_ENA, dev->iobase + APCI1032_CTRL_REG);
 277
 278        s->state = inl(dev->iobase + APCI1032_STATUS_REG) & 0xffff;
 279        comedi_buf_write_samples(s, &s->state, 1);
 280        comedi_handle_events(dev, s);
 281
 282        /* enable the interrupt */
 283        outl(ctrl, dev->iobase + APCI1032_CTRL_REG);
 284
 285        return IRQ_HANDLED;
 286}
 287
 288static int apci1032_di_insn_bits(struct comedi_device *dev,
 289                                 struct comedi_subdevice *s,
 290                                 struct comedi_insn *insn,
 291                                 unsigned int *data)
 292{
 293        data[1] = inl(dev->iobase + APCI1032_DI_REG);
 294
 295        return insn->n;
 296}
 297
 298static int apci1032_auto_attach(struct comedi_device *dev,
 299                                unsigned long context_unused)
 300{
 301        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 302        struct apci1032_private *devpriv;
 303        struct comedi_subdevice *s;
 304        int ret;
 305
 306        devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
 307        if (!devpriv)
 308                return -ENOMEM;
 309
 310        ret = comedi_pci_enable(dev);
 311        if (ret)
 312                return ret;
 313
 314        devpriv->amcc_iobase = pci_resource_start(pcidev, 0);
 315        dev->iobase = pci_resource_start(pcidev, 1);
 316        apci1032_reset(dev);
 317        if (pcidev->irq > 0) {
 318                ret = request_irq(pcidev->irq, apci1032_interrupt, IRQF_SHARED,
 319                                  dev->board_name, dev);
 320                if (ret == 0)
 321                        dev->irq = pcidev->irq;
 322        }
 323
 324        ret = comedi_alloc_subdevices(dev, 2);
 325        if (ret)
 326                return ret;
 327
 328        /*  Allocate and Initialise DI Subdevice Structures */
 329        s = &dev->subdevices[0];
 330        s->type         = COMEDI_SUBD_DI;
 331        s->subdev_flags = SDF_READABLE;
 332        s->n_chan       = 32;
 333        s->maxdata      = 1;
 334        s->range_table  = &range_digital;
 335        s->insn_bits    = apci1032_di_insn_bits;
 336
 337        /* Change-Of-State (COS) interrupt subdevice */
 338        s = &dev->subdevices[1];
 339        if (dev->irq) {
 340                dev->read_subdev = s;
 341                s->type         = COMEDI_SUBD_DI;
 342                s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
 343                s->n_chan       = 1;
 344                s->maxdata      = 1;
 345                s->range_table  = &range_digital;
 346                s->insn_config  = apci1032_cos_insn_config;
 347                s->insn_bits    = apci1032_cos_insn_bits;
 348                s->len_chanlist = 1;
 349                s->do_cmdtest   = apci1032_cos_cmdtest;
 350                s->do_cmd       = apci1032_cos_cmd;
 351                s->cancel       = apci1032_cos_cancel;
 352        } else {
 353                s->type         = COMEDI_SUBD_UNUSED;
 354        }
 355
 356        return 0;
 357}
 358
 359static void apci1032_detach(struct comedi_device *dev)
 360{
 361        if (dev->iobase)
 362                apci1032_reset(dev);
 363        comedi_pci_detach(dev);
 364}
 365
 366static struct comedi_driver apci1032_driver = {
 367        .driver_name    = "addi_apci_1032",
 368        .module         = THIS_MODULE,
 369        .auto_attach    = apci1032_auto_attach,
 370        .detach         = apci1032_detach,
 371};
 372
 373static int apci1032_pci_probe(struct pci_dev *dev,
 374                              const struct pci_device_id *id)
 375{
 376        return comedi_pci_auto_config(dev, &apci1032_driver, id->driver_data);
 377}
 378
 379static const struct pci_device_id apci1032_pci_table[] = {
 380        { PCI_DEVICE(PCI_VENDOR_ID_ADDIDATA, 0x1003) },
 381        { 0 }
 382};
 383MODULE_DEVICE_TABLE(pci, apci1032_pci_table);
 384
 385static struct pci_driver apci1032_pci_driver = {
 386        .name           = "addi_apci_1032",
 387        .id_table       = apci1032_pci_table,
 388        .probe          = apci1032_pci_probe,
 389        .remove         = comedi_pci_auto_unconfig,
 390};
 391module_comedi_pci_driver(apci1032_driver, apci1032_pci_driver);
 392
 393MODULE_AUTHOR("Comedi http://www.comedi.org");
 394MODULE_DESCRIPTION("ADDI-DATA APCI-1032, 32 channel DI boards");
 395MODULE_LICENSE("GPL");
 396
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