drivers/staging/comedi/drivers/pcm3724.c

   1 /*
   2     comedi/drivers/pcm724.c
   3
   4     Drew Csillag <drew_csillag@yahoo.com>
   5
   6     hardware driver for Advantech card:
   7      card:   PCM-3724
   8      driver: pcm3724
   9
  10     Options for PCM-3724
  11      [0] - IO Base
  12 */
  13 /*
  14 Driver: pcm3724
  15 Description: Advantech PCM-3724
  16 Author: Drew Csillag <drew_csillag@yahoo.com>
  17 Devices: [Advantech] PCM-3724 (pcm724)
  18 Status: tested
  19
  20 This is driver for digital I/O boards PCM-3724 with 48 DIO.
  21 It needs 8255.o for operations and only immediate mode is supported.
  22 See the source for configuration details.
  23
  24 Copy/pasted/hacked from pcm724.c
  25 */
  26 /*
  27  * check_driver overrides:
  28  *   struct comedi_insn
  29  */
  30
  31 #include "../comedidev.h"
  32
  33 #include <linux/ioport.h>
  34 #include <linux/delay.h>
  35
  36 #include "8255.h"
  37
  38 #define PCM3724_SIZE   16
  39 #define SIZE_8255       4
  40
  41 #define BUF_C0 0x1
  42 #define BUF_B0 0x2
  43 #define BUF_A0 0x4
  44 #define BUF_C1 0x8
  45 #define BUF_B1 0x10
  46 #define BUF_A1 0x20
  47
  48 #define GATE_A0 0x4
  49 #define GATE_B0 0x2
  50 #define GATE_C0 0x1
  51 #define GATE_A1 0x20
  52 #define GATE_B1 0x10
  53 #define GATE_C1 0x8
  54
  55 /* from 8255.c */
  56 #define CR_CW           0x80
  57 #define _8255_CR 3
  58 #define CR_B_IO         0x02
  59 #define CR_B_MODE       0x04
  60 #define CR_C_IO         0x09
  61 #define CR_A_IO         0x10
  62 #define CR_A_MODE(a)    ((a)<<5)
  63 #define CR_CW           0x80
  64
  65 struct pcm3724_board {
  66         const char *name;       /*  driver name */
  67         int dio;                /*  num of DIO */
  68         int numofports;         /*  num of 8255 subdevices */
  69         unsigned int IRQbits;   /*  allowed interrupts */
  70         unsigned int io_range;  /*  len of IO space */
  71 };
  72
  73 /* used to track configured dios */
  74 struct priv_pcm3724 {
  75         int dio_1;
  76         int dio_2;
  77 };
  78
  79 static int subdev_8255_cb(int dir, int port, int data, unsigned long arg)
  80 {
  81         unsigned long iobase = arg;
  82         unsigned char inbres;
  83         /* printk("8255cb %d %d %d %lx\n", dir,port,data,arg); */
  84         if (dir) {
  85                 /* printk("8255 cb   outb(%x, %lx)\n", data, iobase+port); */
  86                 outb(data, iobase + port);
  87                 return 0;
  88         } else {
  89                 inbres = inb(iobase + port);
  90                 /* printk("8255 cb   inb(%lx) = %x\n", iobase+port, inbres); */
  91                 return inbres;
  92         }
  93 }
  94
  95 static int compute_buffer(int config, int devno, struct comedi_subdevice *s)
  96 {
  97         /* 1 in io_bits indicates output */
  98         if (s->io_bits & 0x0000ff) {
  99                 if (devno == 0)
 100                         config |= BUF_A0;
 101                 else
 102                         config |= BUF_A1;
 103         }
 104         if (s->io_bits & 0x00ff00) {
 105                 if (devno == 0)
 106                         config |= BUF_B0;
 107                 else
 108                         config |= BUF_B1;
 109         }
 110         if (s->io_bits & 0xff0000) {
 111                 if (devno == 0)
 112                         config |= BUF_C0;
 113                 else
 114                         config |= BUF_C1;
 115         }
 116         return config;
 117 }
 118
 119 static void do_3724_config(struct comedi_device *dev,
 120                            struct comedi_subdevice *s, int chanspec)
 121 {
 122         int config;
 123         int buffer_config;
 124         unsigned long port_8255_cfg;
 125
 126         config = CR_CW;
 127         buffer_config = 0;
 128
 129         /* 1 in io_bits indicates output, 1 in config indicates input */
 130         if (!(s->io_bits & 0x0000ff))
 131                 config |= CR_A_IO;
 132
 133         if (!(s->io_bits & 0x00ff00))
 134                 config |= CR_B_IO;
 135
 136         if (!(s->io_bits & 0xff0000))
 137                 config |= CR_C_IO;
 138
 139         buffer_config = compute_buffer(0, 0, dev->subdevices);
 140         buffer_config = compute_buffer(buffer_config, 1, (dev->subdevices) + 1);
 141
 142         if (s == dev->subdevices)
 143                 port_8255_cfg = dev->iobase + _8255_CR;
 144         else
 145                 port_8255_cfg = dev->iobase + SIZE_8255 + _8255_CR;
 146
 147         outb(buffer_config, dev->iobase + 8);   /* update buffer register */
 148         /* printk("pcm3724 buffer_config (%lx) %d, %x\n",
 149                dev->iobase + _8255_CR, chanspec, buffer_config); */
 150
 151         outb(config, port_8255_cfg);
 152 }
 153
 154 static void enable_chan(struct comedi_device *dev, struct comedi_subdevice *s,
 155                         int chanspec)
 156 {
 157         unsigned int mask;
 158         int gatecfg;
 159         struct priv_pcm3724 *priv;
 160
 161         gatecfg = 0;
 162         priv = dev->private;
 163
 164         mask = 1 << CR_CHAN(chanspec);
 165         if (s == dev->subdevices)       /*  subdev 0 */
 166                 priv->dio_1 |= mask;
 167         else            /* subdev 1 */
 168                 priv->dio_2 |= mask;
 169
 170         if (priv->dio_1 & 0xff0000)
 171                 gatecfg |= GATE_C0;
 172
 173         if (priv->dio_1 & 0xff00)
 174                 gatecfg |= GATE_B0;
 175
 176         if (priv->dio_1 & 0xff)
 177                 gatecfg |= GATE_A0;
 178
 179         if (priv->dio_2 & 0xff0000)
 180                 gatecfg |= GATE_C1;
 181
 182         if (priv->dio_2 & 0xff00)
 183                 gatecfg |= GATE_B1;
 184
 185         if (priv->dio_2 & 0xff)
 186                 gatecfg |= GATE_A1;
 187
 188         /*       printk("gate control %x\n", gatecfg); */
 189         outb(gatecfg, dev->iobase + 9);
 190 }
 191
 192 /* overriding the 8255 insn config */
 193 static int subdev_3724_insn_config(struct comedi_device *dev,
 194                                    struct comedi_subdevice *s,
 195                                    struct comedi_insn *insn, unsigned int *data)
 196 {
 197         unsigned int mask;
 198         unsigned int bits;
 199
 200         mask = 1 << CR_CHAN(insn->chanspec);
 201         if (mask & 0x0000ff)
 202                 bits = 0x0000ff;
 203         else if (mask & 0x00ff00)
 204                 bits = 0x00ff00;
 205         else if (mask & 0x0f0000)
 206                 bits = 0x0f0000;
 207         else
 208                 bits = 0xf00000;
 209
 210         switch (data[0]) {
 211         case INSN_CONFIG_DIO_INPUT:
 212                 s->io_bits &= ~bits;
 213                 break;
 214         case INSN_CONFIG_DIO_OUTPUT:
 215                 s->io_bits |= bits;
 216                 break;
 217         case INSN_CONFIG_DIO_QUERY:
 218                 data[1] = (s->io_bits & bits) ? COMEDI_OUTPUT : COMEDI_INPUT;
 219                 return insn->n;
 220                 break;
 221         default:
 222                 return -EINVAL;
 223         }
 224
 225         do_3724_config(dev, s, insn->chanspec);
 226         enable_chan(dev, s, insn->chanspec);
 227         return 1;
 228 }
 229
 230 static int pcm3724_attach(struct comedi_device *dev,
 231                           struct comedi_devconfig *it)
 232 {
 233         const struct pcm3724_board *board = comedi_board(dev);
 234         unsigned long iobase;
 235         unsigned int iorange;
 236         int ret, i, n_subdevices;
 237
 238         iobase = it->options[0];
 239         iorange = board->io_range;
 240
 241         ret = alloc_private(dev, sizeof(struct priv_pcm3724));
 242         if (ret < 0)
 243                 return -ENOMEM;
 244
 245         ((struct priv_pcm3724 *)(dev->private))->dio_1 = 0;
 246         ((struct priv_pcm3724 *)(dev->private))->dio_2 = 0;
 247
 248         printk(KERN_INFO "comedi%d: pcm3724: board=%s, 0x%03lx ", dev->minor,
 249                board->name, iobase);
 250         if (!iobase || !request_region(iobase, iorange, "pcm3724")) {
 251                 printk("I/O port conflict\n");
 252                 return -EIO;
 253         }
 254
 255         dev->iobase = iobase;
 256         dev->board_name = board->name;
 257         printk(KERN_INFO "\n");
 258
 259         n_subdevices = board->numofports;
 260
 261         ret = comedi_alloc_subdevices(dev, n_subdevices);
 262         if (ret)
 263                 return ret;
 264
 265         for (i = 0; i < dev->n_subdevices; i++) {
 266                 subdev_8255_init(dev, dev->subdevices + i, subdev_8255_cb,
 267                                  (unsigned long)(dev->iobase + SIZE_8255 * i));
 268                 ((dev->subdevices) + i)->insn_config = subdev_3724_insn_config;
 269         }
 270         return 0;
 271 }
 272
 273 static void pcm3724_detach(struct comedi_device *dev)
 274 {
 275         const struct pcm3724_board *board = comedi_board(dev);
 276         int i;
 277
 278         if (dev->subdevices) {
 279                 for (i = 0; i < dev->n_subdevices; i++)
 280                         subdev_8255_cleanup(dev, dev->subdevices + i);
 281         }
 282         if (dev->iobase)
 283                 release_region(dev->iobase, board->io_range);
 284 }
 285
 286 static const struct pcm3724_board boardtypes[] = {
 287         { "pcm3724", 48, 2, 0x00fc, PCM3724_SIZE, },
 288 };
 289
 290 static struct comedi_driver pcm3724_driver = {
 291         .driver_name    = "pcm3724",
 292         .module         = THIS_MODULE,
 293         .attach         = pcm3724_attach,
 294         .detach         = pcm3724_detach,
 295         .board_name     = &boardtypes[0].name,
 296         .num_names      = ARRAY_SIZE(boardtypes),
 297         .offset         = sizeof(struct pcm3724_board),
 298 };
 299 module_comedi_driver(pcm3724_driver);
 300
 301 MODULE_AUTHOR("Comedi http://www.comedi.org");
 302 MODULE_DESCRIPTION("Comedi low-level driver");
 303 MODULE_LICENSE("GPL");