linux/drivers/staging/comedi/drivers/addi_apci_2032.c
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   1/*
   2 * addi_apci_2032.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/interrupt.h>
  27#include <linux/slab.h>
  28
  29#include "../comedi_pci.h"
  30#include "addi_watchdog.h"
  31
  32/*
  33 * PCI bar 1 I/O Register map
  34 */
  35#define APCI2032_DO_REG                 0x00
  36#define APCI2032_INT_CTRL_REG           0x04
  37#define APCI2032_INT_CTRL_VCC_ENA       BIT(0)
  38#define APCI2032_INT_CTRL_CC_ENA        BIT(1)
  39#define APCI2032_INT_STATUS_REG         0x08
  40#define APCI2032_INT_STATUS_VCC         BIT(0)
  41#define APCI2032_INT_STATUS_CC          BIT(1)
  42#define APCI2032_STATUS_REG             0x0c
  43#define APCI2032_STATUS_IRQ             BIT(0)
  44#define APCI2032_WDOG_REG               0x10
  45
  46struct apci2032_int_private {
  47        spinlock_t spinlock;            /* protects the following members */
  48        bool active;                    /* an async command is running */
  49        unsigned char enabled_isns;     /* mask of enabled interrupt channels */
  50};
  51
  52static int apci2032_do_insn_bits(struct comedi_device *dev,
  53                                 struct comedi_subdevice *s,
  54                                 struct comedi_insn *insn,
  55                                 unsigned int *data)
  56{
  57        s->state = inl(dev->iobase + APCI2032_DO_REG);
  58
  59        if (comedi_dio_update_state(s, data))
  60                outl(s->state, dev->iobase + APCI2032_DO_REG);
  61
  62        data[1] = s->state;
  63
  64        return insn->n;
  65}
  66
  67static int apci2032_int_insn_bits(struct comedi_device *dev,
  68                                  struct comedi_subdevice *s,
  69                                  struct comedi_insn *insn,
  70                                  unsigned int *data)
  71{
  72        data[1] = inl(dev->iobase + APCI2032_INT_STATUS_REG) & 3;
  73        return insn->n;
  74}
  75
  76static void apci2032_int_stop(struct comedi_device *dev,
  77                              struct comedi_subdevice *s)
  78{
  79        struct apci2032_int_private *subpriv = s->private;
  80
  81        subpriv->active = false;
  82        subpriv->enabled_isns = 0;
  83        outl(0x0, dev->iobase + APCI2032_INT_CTRL_REG);
  84}
  85
  86static int apci2032_int_cmdtest(struct comedi_device *dev,
  87                                struct comedi_subdevice *s,
  88                                struct comedi_cmd *cmd)
  89{
  90        int err = 0;
  91
  92        /* Step 1 : check if triggers are trivially valid */
  93
  94        err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
  95        err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
  96        err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
  97        err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
  98        err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
  99
 100        if (err)
 101                return 1;
 102
 103        /* Step 2a : make sure trigger sources are unique */
 104        err |= comedi_check_trigger_is_unique(cmd->stop_src);
 105
 106        /* Step 2b : and mutually compatible */
 107
 108        if (err)
 109                return 2;
 110
 111        /* Step 3: check if arguments are trivially valid */
 112
 113        err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
 114        err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
 115        err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
 116        err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
 117                                           cmd->chanlist_len);
 118        if (cmd->stop_src == TRIG_COUNT)
 119                err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
 120        else    /* TRIG_NONE */
 121                err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
 122
 123        if (err)
 124                return 3;
 125
 126        /* Step 4: fix up any arguments */
 127
 128        /* Step 5: check channel list if it exists */
 129
 130        return 0;
 131}
 132
 133static int apci2032_int_cmd(struct comedi_device *dev,
 134                            struct comedi_subdevice *s)
 135{
 136        struct comedi_cmd *cmd = &s->async->cmd;
 137        struct apci2032_int_private *subpriv = s->private;
 138        unsigned char enabled_isns;
 139        unsigned int n;
 140        unsigned long flags;
 141
 142        enabled_isns = 0;
 143        for (n = 0; n < cmd->chanlist_len; n++)
 144                enabled_isns |= 1 << CR_CHAN(cmd->chanlist[n]);
 145
 146        spin_lock_irqsave(&subpriv->spinlock, flags);
 147
 148        subpriv->enabled_isns = enabled_isns;
 149        subpriv->active = true;
 150        outl(enabled_isns, dev->iobase + APCI2032_INT_CTRL_REG);
 151
 152        spin_unlock_irqrestore(&subpriv->spinlock, flags);
 153
 154        return 0;
 155}
 156
 157static int apci2032_int_cancel(struct comedi_device *dev,
 158                               struct comedi_subdevice *s)
 159{
 160        struct apci2032_int_private *subpriv = s->private;
 161        unsigned long flags;
 162
 163        spin_lock_irqsave(&subpriv->spinlock, flags);
 164        if (subpriv->active)
 165                apci2032_int_stop(dev, s);
 166        spin_unlock_irqrestore(&subpriv->spinlock, flags);
 167
 168        return 0;
 169}
 170
 171static irqreturn_t apci2032_interrupt(int irq, void *d)
 172{
 173        struct comedi_device *dev = d;
 174        struct comedi_subdevice *s = dev->read_subdev;
 175        struct comedi_cmd *cmd = &s->async->cmd;
 176        struct apci2032_int_private *subpriv;
 177        unsigned int val;
 178
 179        if (!dev->attached)
 180                return IRQ_NONE;
 181
 182        /* Check if VCC OR CC interrupt has occurred */
 183        val = inl(dev->iobase + APCI2032_STATUS_REG) & APCI2032_STATUS_IRQ;
 184        if (!val)
 185                return IRQ_NONE;
 186
 187        subpriv = s->private;
 188        spin_lock(&subpriv->spinlock);
 189
 190        val = inl(dev->iobase + APCI2032_INT_STATUS_REG) & 3;
 191        /* Disable triggered interrupt sources. */
 192        outl(~val & 3, dev->iobase + APCI2032_INT_CTRL_REG);
 193        /*
 194         * Note: We don't reenable the triggered interrupt sources because they
 195         * are level-sensitive, hardware error status interrupt sources and
 196         * they'd keep triggering interrupts repeatedly.
 197         */
 198
 199        if (subpriv->active && (val & subpriv->enabled_isns) != 0) {
 200                unsigned short bits = 0;
 201                int i;
 202
 203                /* Bits in scan data correspond to indices in channel list. */
 204                for (i = 0; i < cmd->chanlist_len; i++) {
 205                        unsigned int chan = CR_CHAN(cmd->chanlist[i]);
 206
 207                        if (val & (1 << chan))
 208                                bits |= (1 << i);
 209                }
 210
 211                comedi_buf_write_samples(s, &bits, 1);
 212
 213                if (cmd->stop_src == TRIG_COUNT &&
 214                    s->async->scans_done >= cmd->stop_arg)
 215                        s->async->events |= COMEDI_CB_EOA;
 216        }
 217
 218        spin_unlock(&subpriv->spinlock);
 219
 220        comedi_handle_events(dev, s);
 221
 222        return IRQ_HANDLED;
 223}
 224
 225static int apci2032_reset(struct comedi_device *dev)
 226{
 227        outl(0x0, dev->iobase + APCI2032_DO_REG);
 228        outl(0x0, dev->iobase + APCI2032_INT_CTRL_REG);
 229
 230        addi_watchdog_reset(dev->iobase + APCI2032_WDOG_REG);
 231
 232        return 0;
 233}
 234
 235static int apci2032_auto_attach(struct comedi_device *dev,
 236                                unsigned long context_unused)
 237{
 238        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 239        struct comedi_subdevice *s;
 240        int ret;
 241
 242        ret = comedi_pci_enable(dev);
 243        if (ret)
 244                return ret;
 245        dev->iobase = pci_resource_start(pcidev, 1);
 246        apci2032_reset(dev);
 247
 248        if (pcidev->irq > 0) {
 249                ret = request_irq(pcidev->irq, apci2032_interrupt,
 250                                  IRQF_SHARED, dev->board_name, dev);
 251                if (ret == 0)
 252                        dev->irq = pcidev->irq;
 253        }
 254
 255        ret = comedi_alloc_subdevices(dev, 3);
 256        if (ret)
 257                return ret;
 258
 259        /* Initialize the digital output subdevice */
 260        s = &dev->subdevices[0];
 261        s->type         = COMEDI_SUBD_DO;
 262        s->subdev_flags = SDF_WRITABLE;
 263        s->n_chan       = 32;
 264        s->maxdata      = 1;
 265        s->range_table  = &range_digital;
 266        s->insn_bits    = apci2032_do_insn_bits;
 267
 268        /* Initialize the watchdog subdevice */
 269        s = &dev->subdevices[1];
 270        ret = addi_watchdog_init(s, dev->iobase + APCI2032_WDOG_REG);
 271        if (ret)
 272                return ret;
 273
 274        /* Initialize the interrupt subdevice */
 275        s = &dev->subdevices[2];
 276        s->type         = COMEDI_SUBD_DI;
 277        s->subdev_flags = SDF_READABLE;
 278        s->n_chan       = 2;
 279        s->maxdata      = 1;
 280        s->range_table  = &range_digital;
 281        s->insn_bits    = apci2032_int_insn_bits;
 282        if (dev->irq) {
 283                struct apci2032_int_private *subpriv;
 284
 285                dev->read_subdev = s;
 286                subpriv = kzalloc(sizeof(*subpriv), GFP_KERNEL);
 287                if (!subpriv)
 288                        return -ENOMEM;
 289                spin_lock_init(&subpriv->spinlock);
 290                s->private      = subpriv;
 291                s->subdev_flags = SDF_READABLE | SDF_CMD_READ | SDF_PACKED;
 292                s->len_chanlist = 2;
 293                s->do_cmdtest   = apci2032_int_cmdtest;
 294                s->do_cmd       = apci2032_int_cmd;
 295                s->cancel       = apci2032_int_cancel;
 296        }
 297
 298        return 0;
 299}
 300
 301static void apci2032_detach(struct comedi_device *dev)
 302{
 303        if (dev->iobase)
 304                apci2032_reset(dev);
 305        comedi_pci_detach(dev);
 306        if (dev->read_subdev)
 307                kfree(dev->read_subdev->private);
 308}
 309
 310static struct comedi_driver apci2032_driver = {
 311        .driver_name    = "addi_apci_2032",
 312        .module         = THIS_MODULE,
 313        .auto_attach    = apci2032_auto_attach,
 314        .detach         = apci2032_detach,
 315};
 316
 317static int apci2032_pci_probe(struct pci_dev *dev,
 318                              const struct pci_device_id *id)
 319{
 320        return comedi_pci_auto_config(dev, &apci2032_driver, id->driver_data);
 321}
 322
 323static const struct pci_device_id apci2032_pci_table[] = {
 324        { PCI_DEVICE(PCI_VENDOR_ID_ADDIDATA, 0x1004) },
 325        { 0 }
 326};
 327MODULE_DEVICE_TABLE(pci, apci2032_pci_table);
 328
 329static struct pci_driver apci2032_pci_driver = {
 330        .name           = "addi_apci_2032",
 331        .id_table       = apci2032_pci_table,
 332        .probe          = apci2032_pci_probe,
 333        .remove         = comedi_pci_auto_unconfig,
 334};
 335module_comedi_pci_driver(apci2032_driver, apci2032_pci_driver);
 336
 337MODULE_AUTHOR("Comedi http://www.comedi.org");
 338MODULE_DESCRIPTION("ADDI-DATA APCI-2032, 32 channel DO boards");
 339MODULE_LICENSE("GPL");
 340
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