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