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 #define devpriv ((struct fl512_private *) dev->private)
  33
  34 static const struct comedi_lrange range_fl512 = { 4, {
  35                                                       BIP_RANGE(0.5),
  36                                                       BIP_RANGE(1),
  37                                                       BIP_RANGE(5),
  38                                                       BIP_RANGE(10),
  39                                                       UNI_RANGE(1),
  40                                                       UNI_RANGE(5),
  41                                                       UNI_RANGE(10),
  42                                                       }
  43 };
  44
  45 static int fl512_attach(struct comedi_device *dev, struct comedi_devconfig *it);
  46 static int fl512_detach(struct comedi_device *dev);
  47
  48 static struct comedi_driver driver_fl512 = {
  49         .driver_name = "fl512",
  50         .module = THIS_MODULE,
  51         .attach = fl512_attach,
  52         .detach = fl512_detach,
  53 };
  54
  55 static int __init driver_fl512_init_module(void)
  56 {
  57         return comedi_driver_register(&driver_fl512);
  58 }
  59
  60 static void __exit driver_fl512_cleanup_module(void)
  61 {
  62         comedi_driver_unregister(&driver_fl512);
  63 }
  64
  65 module_init(driver_fl512_init_module);
  66 module_exit(driver_fl512_cleanup_module);
  67
  68 static int fl512_ai_insn(struct comedi_device *dev,
  69                          struct comedi_subdevice *s, struct comedi_insn *insn,
  70                          unsigned int *data);
  71 static int fl512_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s,
  72                          struct comedi_insn *insn, unsigned int *data);
  73 static int fl512_ao_insn_readback(struct comedi_device *dev,
  74                                   struct comedi_subdevice *s,
  75                                   struct comedi_insn *insn, unsigned int *data);
  76
  77 /*
  78  * fl512_ai_insn : this is the analog input function
  79  */
  80 static int fl512_ai_insn(struct comedi_device *dev,
  81                          struct comedi_subdevice *s, struct comedi_insn *insn,
  82                          unsigned int *data)
  83 {
  84         int n;
  85         unsigned int lo_byte, hi_byte;
  86         char chan = CR_CHAN(insn->chanspec);
  87         unsigned long iobase = dev->iobase;
  88
  89         for (n = 0; n < insn->n; n++) { /* sample n times on selected channel */
  90                 /* XXX probably can move next step out of for() loop -- will
  91                  * make AI a little bit faster. */
  92                 outb(chan, iobase + 2); /* select chan */
  93                 outb(0, iobase + 3);    /* start conversion */
  94                 /* XXX should test "done" flag instead of delay */
  95                 udelay(30);     /* sleep 30 usec */
  96                 lo_byte = inb(iobase + 2);      /* low 8 byte */
  97                 hi_byte = inb(iobase + 3) & 0xf; /* high 4 bit and mask */
  98                 data[n] = lo_byte + (hi_byte << 8);
  99         }
 100         return n;
 101 }
 102
 103 /*
 104  * fl512_ao_insn : used to write to a DA port n times
 105  */
 106 static int fl512_ao_insn(struct comedi_device *dev,
 107                          struct comedi_subdevice *s, struct comedi_insn *insn,
 108                          unsigned int *data)
 109 {
 110         int n;
 111         int chan = CR_CHAN(insn->chanspec);     /* get chan to write */
 112         unsigned long iobase = dev->iobase;     /* get base address  */
 113
 114         for (n = 0; n < insn->n; n++) { /* write n data set */
 115                 /* write low byte   */
 116                 outb(data[n] & 0x0ff, iobase + 4 + 2 * chan);
 117                 /* write high byte  */
 118                 outb((data[n] & 0xf00) >> 8, iobase + 4 + 2 * chan);
 119                 inb(iobase + 4 + 2 * chan);     /* trig */
 120
 121                 devpriv->ao_readback[chan] = data[n];
 122         }
 123         return n;
 124 }
 125
 126 /*
 127  * fl512_ao_insn_readback : used to read previous values written to
 128  * DA port
 129  */
 130 static int fl512_ao_insn_readback(struct comedi_device *dev,
 131                                   struct comedi_subdevice *s,
 132                                   struct comedi_insn *insn, unsigned int *data)
 133 {
 134         int n;
 135         int chan = CR_CHAN(insn->chanspec);
 136
 137         for (n = 0; n < insn->n; n++)
 138                 data[n] = devpriv->ao_readback[chan];
 139
 140         return n;
 141 }
 142
 143 /*
 144  * start attach
 145  */
 146 static int fl512_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 147 {
 148         unsigned long iobase;
 149
 150         /* pointer to the subdevice: Analog in, Analog out,
 151            (not made ->and Digital IO) */
 152         struct comedi_subdevice *s;
 153
 154         iobase = it->options[0];
 155         printk(KERN_INFO "comedi:%d fl512: 0x%04lx", dev->minor, iobase);
 156         if (!request_region(iobase, FL512_SIZE, "fl512")) {
 157                 printk(KERN_WARNING " I/O port conflict\n");
 158                 return -EIO;
 159         }
 160         dev->iobase = iobase;
 161         dev->board_name = "fl512";
 162         if (alloc_private(dev, sizeof(struct fl512_private)) < 0)
 163                 return -ENOMEM;
 164
 165 #if DEBUG
 166         printk(KERN_DEBUG "malloc ok\n");
 167 #endif
 168
 169         if (alloc_subdevices(dev, 2) < 0)
 170                 return -ENOMEM;
 171
 172         /*
 173          * this if the definitions of the supdevices, 2 have been defined
 174          */
 175         /* Analog indput */
 176         s = dev->subdevices + 0;
 177         /* define subdevice as Analog In */
 178         s->type = COMEDI_SUBD_AI;
 179         /* you can read it from userspace */
 180         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 181         /* Number of Analog input channels */
 182         s->n_chan = 16;
 183         /* accept only 12 bits of data */
 184         s->maxdata = 0x0fff;
 185         /* device use one of the ranges */
 186         s->range_table = &range_fl512;
 187         /* function to call when read AD */
 188         s->insn_read = fl512_ai_insn;
 189         printk(KERN_INFO "comedi: fl512: subdevice 0 initialized\n");
 190
 191         /* Analog output */
 192         s = dev->subdevices + 1;
 193         /* define subdevice as Analog OUT */
 194         s->type = COMEDI_SUBD_AO;
 195         /* you can write it from userspace */
 196         s->subdev_flags = SDF_WRITABLE;
 197         /* Number of Analog output channels */
 198         s->n_chan = 2;
 199         /* accept only 12 bits of data */
 200         s->maxdata = 0x0fff;
 201         /* device use one of the ranges */
 202         s->range_table = &range_fl512;
 203         /* function to call when write DA */
 204         s->insn_write = fl512_ao_insn;
 205         /* function to call when reading DA */
 206         s->insn_read = fl512_ao_insn_readback;
 207         printk(KERN_INFO "comedi: fl512: subdevice 1 initialized\n");
 208
 209         return 1;
 210 }
 211
 212 static int fl512_detach(struct comedi_device *dev)
 213 {
 214         if (dev->iobase)
 215                 release_region(dev->iobase, FL512_SIZE);
 216         printk(KERN_INFO "comedi%d: fl512: dummy i detach\n", dev->minor);
 217         return 0;
 218 }
 219
 220 MODULE_AUTHOR("Comedi http://www.comedi.org");
 221 MODULE_DESCRIPTION("Comedi low-level driver");
 222 MODULE_LICENSE("GPL");