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  *   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 static int pcm3724_attach(comedi_device * dev, comedi_devconfig * it);
  66 static int pcm3724_detach(comedi_device * dev);
  67
  68 typedef struct {
  69         const char *name;       // driver name
  70         int dio;                // num of DIO
  71         int numofports;         // num of 8255 subdevices
  72         unsigned int IRQbits;   // allowed interrupts
  73         unsigned int io_range;  // len of IO space
  74 } boardtype;
  75
  76 //used to track configured dios
  77 typedef struct {
  78         int dio_1;
  79         int dio_2;
  80 } priv_pcm3724;
  81 static const boardtype boardtypes[] = {
  82         {"pcm3724", 48, 2, 0x00fc, PCM3724_SIZE,},
  83 };
  84
  85 #define n_boardtypes (sizeof(boardtypes)/sizeof(boardtype))
  86 #define this_board ((const boardtype *)dev->board_ptr)
  87
  88 static comedi_driver driver_pcm3724 = {
  89       driver_name:"pcm3724",
  90       module:THIS_MODULE,
  91       attach:pcm3724_attach,
  92       detach:pcm3724_detach,
  93       board_name:&boardtypes[0].name,
  94       num_names:n_boardtypes,
  95       offset:sizeof(boardtype),
  96 };
  97
  98 COMEDI_INITCLEANUP(driver_pcm3724);
  99
 100 //          (setq c-basic-offset 8)
 101
 102 static int subdev_8255_cb(int dir, int port, int data, unsigned long arg)
 103 {
 104         unsigned long iobase = arg;
 105         unsigned char inbres;
 106         //printk("8255cb %d %d %d %lx\n", dir,port,data,arg);
 107         if (dir) {
 108                 //printk("8255 cb   outb(%x, %lx)\n", data, iobase+port);
 109                 outb(data, iobase + port);
 110                 return 0;
 111         } else {
 112                 inbres = inb(iobase + port);
 113                 //printk("8255 cb   inb(%lx) = %x\n", iobase+port, inbres);
 114                 return inbres;
 115         }
 116 }
 117
 118 static int compute_buffer(int config, int devno, comedi_subdevice * s)
 119 {
 120         /* 1 in io_bits indicates output */
 121         if (s->io_bits & 0x0000ff) {
 122                 if (devno == 0) {
 123                         config |= BUF_A0;
 124                 } else {
 125                         config |= BUF_A1;
 126                 }
 127         }
 128         if (s->io_bits & 0x00ff00) {
 129                 if (devno == 0) {
 130                         config |= BUF_B0;
 131                 } else {
 132                         config |= BUF_B1;
 133                 }
 134         }
 135         if (s->io_bits & 0xff0000) {
 136                 if (devno == 0) {
 137                         config |= BUF_C0;
 138                 } else {
 139                         config |= BUF_C1;
 140                 }
 141         }
 142         return config;
 143 }
 144
 145 static void do_3724_config(comedi_device * dev, comedi_subdevice * s,
 146         int chanspec)
 147 {
 148         int config;
 149         int buffer_config;
 150         unsigned long port_8255_cfg;
 151
 152         config = CR_CW;
 153         buffer_config = 0;
 154
 155         /* 1 in io_bits indicates output, 1 in config indicates input */
 156         if (!(s->io_bits & 0x0000ff)) {
 157                 config |= CR_A_IO;
 158         }
 159         if (!(s->io_bits & 0x00ff00)) {
 160                 config |= CR_B_IO;
 161         }
 162         if (!(s->io_bits & 0xff0000)) {
 163                 config |= CR_C_IO;
 164         }
 165
 166         buffer_config = compute_buffer(0, 0, dev->subdevices);
 167         buffer_config = compute_buffer(buffer_config, 1, (dev->subdevices) + 1);
 168
 169         if (s == dev->subdevices) {
 170                 port_8255_cfg = dev->iobase + _8255_CR;
 171         } else {
 172                 port_8255_cfg = dev->iobase + SIZE_8255 + _8255_CR;
 173         }
 174         outb(buffer_config, dev->iobase + 8);   /* update buffer register */
 175         //printk("pcm3724 buffer_config (%lx) %d, %x\n", dev->iobase + _8255_CR, chanspec, buffer_config);
 176         outb(config, port_8255_cfg);
 177 }
 178
 179 static void enable_chan(comedi_device * dev, comedi_subdevice * s, int chanspec)
 180 {
 181         unsigned int mask;
 182         int gatecfg;
 183         priv_pcm3724 *priv;
 184
 185         gatecfg = 0;
 186         priv = (priv_pcm3724 *) (dev->private);
 187
 188         mask = 1 << CR_CHAN(chanspec);
 189         if (s == dev->subdevices) {     // subdev 0
 190                 priv->dio_1 |= mask;
 191         } else {                //subdev 1
 192                 priv->dio_2 |= mask;
 193         }
 194         if (priv->dio_1 & 0xff0000) {
 195                 gatecfg |= GATE_C0;
 196         }
 197         if (priv->dio_1 & 0xff00) {
 198                 gatecfg |= GATE_B0;
 199         }
 200         if (priv->dio_1 & 0xff) {
 201                 gatecfg |= GATE_A0;
 202         }
 203         if (priv->dio_2 & 0xff0000) {
 204                 gatecfg |= GATE_C1;
 205         }
 206         if (priv->dio_2 & 0xff00) {
 207                 gatecfg |= GATE_B1;
 208         }
 209         if (priv->dio_2 & 0xff) {
 210                 gatecfg |= GATE_A1;
 211         }
 212         //      printk("gate control %x\n", gatecfg);
 213         outb(gatecfg, dev->iobase + 9);
 214 }
 215
 216 /* overriding the 8255 insn config */
 217 static int subdev_3724_insn_config(comedi_device * dev, comedi_subdevice * s,
 218         comedi_insn * insn, unsigned int * data)
 219 {
 220         unsigned int mask;
 221         unsigned int bits;
 222
 223         mask = 1 << CR_CHAN(insn->chanspec);
 224         if (mask & 0x0000ff) {
 225                 bits = 0x0000ff;
 226         } else if (mask & 0x00ff00) {
 227                 bits = 0x00ff00;
 228         } else if (mask & 0x0f0000) {
 229                 bits = 0x0f0000;
 230         } else {
 231                 bits = 0xf00000;
 232         }
 233
 234         switch (data[0]) {
 235         case INSN_CONFIG_DIO_INPUT:
 236                 s->io_bits &= ~bits;
 237                 break;
 238         case INSN_CONFIG_DIO_OUTPUT:
 239                 s->io_bits |= bits;
 240                 break;
 241         case INSN_CONFIG_DIO_QUERY:
 242                 data[1] = (s->io_bits & bits) ? COMEDI_OUTPUT : COMEDI_INPUT;
 243                 return insn->n;
 244                 break;
 245         default:
 246                 return -EINVAL;
 247         }
 248
 249         do_3724_config(dev, s, insn->chanspec);
 250         enable_chan(dev, s, insn->chanspec);
 251         return 1;
 252 }
 253
 254 static int pcm3724_attach(comedi_device * dev, comedi_devconfig * it)
 255 {
 256         unsigned long iobase;
 257         unsigned int iorange;
 258         int ret, i, n_subdevices;
 259
 260         iobase = it->options[0];
 261         iorange = this_board->io_range;
 262         if ((ret = alloc_private(dev, sizeof(priv_pcm3724))) < 0)
 263                 return -ENOMEM;
 264
 265         ((priv_pcm3724 *) (dev->private))->dio_1 = 0;
 266         ((priv_pcm3724 *) (dev->private))->dio_2 = 0;
 267
 268         printk("comedi%d: pcm3724: board=%s, 0x%03lx ", dev->minor,
 269                 this_board->name, iobase);
 270         if (!iobase || !request_region(iobase, iorange, "pcm3724")) {
 271                 printk("I/O port conflict\n");
 272                 return -EIO;
 273         }
 274
 275         dev->iobase = iobase;
 276         dev->board_name = this_board->name;
 277         printk("\n");
 278
 279         n_subdevices = this_board->numofports;
 280
 281         if ((ret = alloc_subdevices(dev, n_subdevices)) < 0)
 282                 return ret;
 283
 284         for (i = 0; i < dev->n_subdevices; i++) {
 285                 subdev_8255_init(dev, dev->subdevices + i, subdev_8255_cb,
 286                         (unsigned long)(dev->iobase + SIZE_8255 * i));
 287                 ((dev->subdevices) + i)->insn_config = subdev_3724_insn_config;
 288         };
 289         return 0;
 290 }
 291
 292 static int pcm3724_detach(comedi_device * dev)
 293 {
 294         int i;
 295
 296         if (dev->subdevices) {
 297                 for (i = 0; i < dev->n_subdevices; i++) {
 298                         subdev_8255_cleanup(dev, dev->subdevices + i);
 299                 }
 300         }
 301         if (dev->iobase) {
 302                 release_region(dev->iobase, this_board->io_range);
 303         }
 304
 305         return 0;
 306 }