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 /* used to track configured dios */
  66 struct priv_pcm3724 {
  67         int dio_1;
  68         int dio_2;
  69 };
  70
  71 static int subdev_8255_cb(int dir, int port, int data, unsigned long arg)
  72 {
  73         unsigned long iobase = arg;
  74         unsigned char inbres;
  75         /* printk("8255cb %d %d %d %lx\n", dir,port,data,arg); */
  76         if (dir) {
  77                 /* printk("8255 cb   outb(%x, %lx)\n", data, iobase+port); */
  78                 outb(data, iobase + port);
  79                 return 0;
  80         } else {
  81                 inbres = inb(iobase + port);
  82                 /* printk("8255 cb   inb(%lx) = %x\n", iobase+port, inbres); */
  83                 return inbres;
  84         }
  85 }
  86
  87 static int compute_buffer(int config, int devno, struct comedi_subdevice *s)
  88 {
  89         /* 1 in io_bits indicates output */
  90         if (s->io_bits & 0x0000ff) {
  91                 if (devno == 0)
  92                         config |= BUF_A0;
  93                 else
  94                         config |= BUF_A1;
  95         }
  96         if (s->io_bits & 0x00ff00) {
  97                 if (devno == 0)
  98                         config |= BUF_B0;
  99                 else
 100                         config |= BUF_B1;
 101         }
 102         if (s->io_bits & 0xff0000) {
 103                 if (devno == 0)
 104                         config |= BUF_C0;
 105                 else
 106                         config |= BUF_C1;
 107         }
 108         return config;
 109 }
 110
 111 static void do_3724_config(struct comedi_device *dev,
 112                            struct comedi_subdevice *s, int chanspec)
 113 {
 114         struct comedi_subdevice *s_dio1 = &dev->subdevices[0];
 115         struct comedi_subdevice *s_dio2 = &dev->subdevices[1];
 116         int config;
 117         int buffer_config;
 118         unsigned long port_8255_cfg;
 119
 120         config = CR_CW;
 121         buffer_config = 0;
 122
 123         /* 1 in io_bits indicates output, 1 in config indicates input */
 124         if (!(s->io_bits & 0x0000ff))
 125                 config |= CR_A_IO;
 126
 127         if (!(s->io_bits & 0x00ff00))
 128                 config |= CR_B_IO;
 129
 130         if (!(s->io_bits & 0xff0000))
 131                 config |= CR_C_IO;
 132
 133         buffer_config = compute_buffer(0, 0, s_dio1);
 134         buffer_config = compute_buffer(buffer_config, 1, s_dio2);
 135
 136         if (s == s_dio1)
 137                 port_8255_cfg = dev->iobase + _8255_CR;
 138         else
 139                 port_8255_cfg = dev->iobase + SIZE_8255 + _8255_CR;
 140
 141         outb(buffer_config, dev->iobase + 8);   /* update buffer register */
 142         /* printk("pcm3724 buffer_config (%lx) %d, %x\n",
 143                dev->iobase + _8255_CR, chanspec, buffer_config); */
 144
 145         outb(config, port_8255_cfg);
 146 }
 147
 148 static void enable_chan(struct comedi_device *dev, struct comedi_subdevice *s,
 149                         int chanspec)
 150 {
 151         struct priv_pcm3724 *priv = dev->private;
 152         struct comedi_subdevice *s_dio1 = &dev->subdevices[0];
 153         unsigned int mask;
 154         int gatecfg;
 155
 156         gatecfg = 0;
 157
 158         mask = 1 << CR_CHAN(chanspec);
 159         if (s == s_dio1)
 160                 priv->dio_1 |= mask;
 161         else
 162                 priv->dio_2 |= mask;
 163
 164         if (priv->dio_1 & 0xff0000)
 165                 gatecfg |= GATE_C0;
 166
 167         if (priv->dio_1 & 0xff00)
 168                 gatecfg |= GATE_B0;
 169
 170         if (priv->dio_1 & 0xff)
 171                 gatecfg |= GATE_A0;
 172
 173         if (priv->dio_2 & 0xff0000)
 174                 gatecfg |= GATE_C1;
 175
 176         if (priv->dio_2 & 0xff00)
 177                 gatecfg |= GATE_B1;
 178
 179         if (priv->dio_2 & 0xff)
 180                 gatecfg |= GATE_A1;
 181
 182         /*       printk("gate control %x\n", gatecfg); */
 183         outb(gatecfg, dev->iobase + 9);
 184 }
 185
 186 /* overriding the 8255 insn config */
 187 static int subdev_3724_insn_config(struct comedi_device *dev,
 188                                    struct comedi_subdevice *s,
 189                                    struct comedi_insn *insn, unsigned int *data)
 190 {
 191         unsigned int mask;
 192         unsigned int bits;
 193
 194         mask = 1 << CR_CHAN(insn->chanspec);
 195         if (mask & 0x0000ff)
 196                 bits = 0x0000ff;
 197         else if (mask & 0x00ff00)
 198                 bits = 0x00ff00;
 199         else if (mask & 0x0f0000)
 200                 bits = 0x0f0000;
 201         else
 202                 bits = 0xf00000;
 203
 204         switch (data[0]) {
 205         case INSN_CONFIG_DIO_INPUT:
 206                 s->io_bits &= ~bits;
 207                 break;
 208         case INSN_CONFIG_DIO_OUTPUT:
 209                 s->io_bits |= bits;
 210                 break;
 211         case INSN_CONFIG_DIO_QUERY:
 212                 data[1] = (s->io_bits & bits) ? COMEDI_OUTPUT : COMEDI_INPUT;
 213                 return insn->n;
 214                 break;
 215         default:
 216                 return -EINVAL;
 217         }
 218
 219         do_3724_config(dev, s, insn->chanspec);
 220         enable_chan(dev, s, insn->chanspec);
 221         return 1;
 222 }
 223
 224 static int pcm3724_attach(struct comedi_device *dev,
 225                           struct comedi_devconfig *it)
 226 {
 227         struct priv_pcm3724 *priv;
 228         struct comedi_subdevice *s;
 229         int ret, i;
 230
 231         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 232         if (!priv)
 233                 return -ENOMEM;
 234         dev->private = priv;
 235
 236         ret = comedi_request_region(dev, it->options[0], PCM3724_SIZE);
 237         if (ret)
 238                 return ret;
 239
 240         ret = comedi_alloc_subdevices(dev, 2);
 241         if (ret)
 242                 return ret;
 243
 244         for (i = 0; i < dev->n_subdevices; i++) {
 245                 s = &dev->subdevices[i];
 246                 subdev_8255_init(dev, s, subdev_8255_cb,
 247                                  (unsigned long)(dev->iobase + SIZE_8255 * i));
 248                 s->insn_config = subdev_3724_insn_config;
 249         }
 250         return 0;
 251 }
 252
 253 static void pcm3724_detach(struct comedi_device *dev)
 254 {
 255         int i;
 256
 257         for (i = 0; i < dev->n_subdevices; i++)
 258                 comedi_spriv_free(dev, i);
 259         comedi_legacy_detach(dev);
 260 }
 261
 262 static struct comedi_driver pcm3724_driver = {
 263         .driver_name    = "pcm3724",
 264         .module         = THIS_MODULE,
 265         .attach         = pcm3724_attach,
 266         .detach         = pcm3724_detach,
 267 };
 268 module_comedi_driver(pcm3724_driver);
 269
 270 MODULE_AUTHOR("Comedi http://www.comedi.org");
 271 MODULE_DESCRIPTION("Comedi low-level driver");
 272 MODULE_LICENSE("GPL");