drivers/staging/comedi/drivers/fl512.c

   1 /*
   2     comedi/drivers/fl512.c
   3     Anders Gnistrup <ex18@kalman.iau.dtu.dk>
   4 */
   5
   6 /*
   7 Driver: fl512
   8 Description: unknown
   9 Author: Anders Gnistrup <ex18@kalman.iau.dtu.dk>
  10 Devices: [unknown] FL512 (fl512)
  11 Status: unknown
  12
  13 Digital I/O is not supported.
  14
  15 Configuration options:
  16   [0] - I/O port base address
  17 */
  18
  19 #define DEBUG 0
  20
  21 #include "../comedidev.h"
  22
  23 #include <linux/delay.h>
  24 #include <linux/ioport.h>
  25
  26 #define FL512_SIZE 16           /* the size of the used memory */
  27 struct fl512_private {
  28
  29         short ao_readback[2];
  30 };
  31
  32 static const struct comedi_lrange range_fl512 = { 4, {
  33                                                       BIP_RANGE(0.5),
  34                                                       BIP_RANGE(1),
  35                                                       BIP_RANGE(5),
  36                                                       BIP_RANGE(10),
  37                                                       UNI_RANGE(1),
  38                                                       UNI_RANGE(5),
  39                                                       UNI_RANGE(10),
  40                                                       }
  41 };
  42
  43 /*
  44  * fl512_ai_insn : this is the analog input function
  45  */
  46 static int fl512_ai_insn(struct comedi_device *dev,
  47                          struct comedi_subdevice *s, struct comedi_insn *insn,
  48                          unsigned int *data)
  49 {
  50         int n;
  51         unsigned int lo_byte, hi_byte;
  52         char chan = CR_CHAN(insn->chanspec);
  53         unsigned long iobase = dev->iobase;
  54
  55         for (n = 0; n < insn->n; n++) { /* sample n times on selected channel */
  56                 /* XXX probably can move next step out of for() loop -- will
  57                  * make AI a little bit faster. */
  58                 outb(chan, iobase + 2); /* select chan */
  59                 outb(0, iobase + 3);    /* start conversion */
  60                 /* XXX should test "done" flag instead of delay */
  61                 udelay(30);     /* sleep 30 usec */
  62                 lo_byte = inb(iobase + 2);      /* low 8 byte */
  63                 hi_byte = inb(iobase + 3) & 0xf; /* high 4 bit and mask */
  64                 data[n] = lo_byte + (hi_byte << 8);
  65         }
  66         return n;
  67 }
  68
  69 /*
  70  * fl512_ao_insn : used to write to a DA port n times
  71  */
  72 static int fl512_ao_insn(struct comedi_device *dev,
  73                          struct comedi_subdevice *s, struct comedi_insn *insn,
  74                          unsigned int *data)
  75 {
  76         struct fl512_private *devpriv = dev->private;
  77         int n;
  78         int chan = CR_CHAN(insn->chanspec);     /* get chan to write */
  79         unsigned long iobase = dev->iobase;     /* get base address  */
  80
  81         for (n = 0; n < insn->n; n++) { /* write n data set */
  82                 /* write low byte   */
  83                 outb(data[n] & 0x0ff, iobase + 4 + 2 * chan);
  84                 /* write high byte  */
  85                 outb((data[n] & 0xf00) >> 8, iobase + 4 + 2 * chan);
  86                 inb(iobase + 4 + 2 * chan);     /* trig */
  87
  88                 devpriv->ao_readback[chan] = data[n];
  89         }
  90         return n;
  91 }
  92
  93 /*
  94  * fl512_ao_insn_readback : used to read previous values written to
  95  * DA port
  96  */
  97 static int fl512_ao_insn_readback(struct comedi_device *dev,
  98                                   struct comedi_subdevice *s,
  99                                   struct comedi_insn *insn, unsigned int *data)
 100 {
 101         struct fl512_private *devpriv = dev->private;
 102         int n;
 103         int chan = CR_CHAN(insn->chanspec);
 104
 105         for (n = 0; n < insn->n; n++)
 106                 data[n] = devpriv->ao_readback[chan];
 107
 108         return n;
 109 }
 110
 111 static int fl512_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 112 {
 113         struct fl512_private *devpriv;
 114         unsigned long iobase;
 115         int ret;
 116
 117         /* pointer to the subdevice: Analog in, Analog out,
 118            (not made ->and Digital IO) */
 119         struct comedi_subdevice *s;
 120
 121         iobase = it->options[0];
 122         printk(KERN_INFO "comedi:%d fl512: 0x%04lx", dev->minor, iobase);
 123         if (!request_region(iobase, FL512_SIZE, "fl512")) {
 124                 printk(KERN_WARNING " I/O port conflict\n");
 125                 return -EIO;
 126         }
 127         dev->iobase = iobase;
 128         dev->board_name = "fl512";
 129
 130         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 131         if (!devpriv)
 132                 return -ENOMEM;
 133         dev->private = devpriv;
 134
 135 #if DEBUG
 136         printk(KERN_DEBUG "malloc ok\n");
 137 #endif
 138
 139         ret = comedi_alloc_subdevices(dev, 2);
 140         if (ret)
 141                 return ret;
 142
 143         /*
 144          * this if the definitions of the supdevices, 2 have been defined
 145          */
 146         /* Analog indput */
 147         s = &dev->subdevices[0];
 148         /* define subdevice as Analog In */
 149         s->type = COMEDI_SUBD_AI;
 150         /* you can read it from userspace */
 151         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 152         /* Number of Analog input channels */
 153         s->n_chan = 16;
 154         /* accept only 12 bits of data */
 155         s->maxdata = 0x0fff;
 156         /* device use one of the ranges */
 157         s->range_table = &range_fl512;
 158         /* function to call when read AD */
 159         s->insn_read = fl512_ai_insn;
 160         printk(KERN_INFO "comedi: fl512: subdevice 0 initialized\n");
 161
 162         /* Analog output */
 163         s = &dev->subdevices[1];
 164         /* define subdevice as Analog OUT */
 165         s->type = COMEDI_SUBD_AO;
 166         /* you can write it from userspace */
 167         s->subdev_flags = SDF_WRITABLE;
 168         /* Number of Analog output channels */
 169         s->n_chan = 2;
 170         /* accept only 12 bits of data */
 171         s->maxdata = 0x0fff;
 172         /* device use one of the ranges */
 173         s->range_table = &range_fl512;
 174         /* function to call when write DA */
 175         s->insn_write = fl512_ao_insn;
 176         /* function to call when reading DA */
 177         s->insn_read = fl512_ao_insn_readback;
 178         printk(KERN_INFO "comedi: fl512: subdevice 1 initialized\n");
 179
 180         return 1;
 181 }
 182
 183 static void fl512_detach(struct comedi_device *dev)
 184 {
 185         if (dev->iobase)
 186                 release_region(dev->iobase, FL512_SIZE);
 187 }
 188
 189 static struct comedi_driver fl512_driver = {
 190         .driver_name    = "fl512",
 191         .module         = THIS_MODULE,
 192         .attach         = fl512_attach,
 193         .detach         = fl512_detach,
 194 };
 195 module_comedi_driver(fl512_driver);
 196
 197 MODULE_AUTHOR("Comedi http://www.comedi.org");
 198 MODULE_DESCRIPTION("Comedi low-level driver");
 199 MODULE_LICENSE("GPL");