drivers/staging/comedi/drivers/ssv_dnp.c

   1 /*
   2     comedi/drivers/ssv_dnp.c
   3     generic comedi driver for SSV Embedded Systems' DIL/Net-PCs
   4     Copyright (C) 2001 Robert Schwebel <robert@schwebel.de>
   5
   6     COMEDI - Linux Control and Measurement Device Interface
   7     Copyright (C) 2000 David A. Schleef <ds@schleef.org>
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17     GNU General Public License for more details.
  18
  19     You should have received a copy of the GNU General Public License
  20     along with this program; if not, write to the Free Software
  21     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 */
  24 /*
  25 Driver: ssv_dnp
  26 Description: SSV Embedded Systems DIL/Net-PC
  27 Author: Robert Schwebel <robert@schwebel.de>
  28 Devices: [SSV Embedded Systems] DIL/Net-PC 1486 (dnp-1486)
  29 Status: unknown
  30 */
  31
  32 /* include files ----------------------------------------------------------- */
  33
  34 #include "../comedidev.h"
  35
  36 /* Some global definitions: the registers of the DNP ----------------------- */
  37 /*                                                                           */
  38 /* For port A and B the mode register has bits corresponding to the output   */
  39 /* pins, where Bit-N = 0 -> input, Bit-N = 1 -> output. Note that bits       */
  40 /* 4 to 7 correspond to pin 0..3 for port C data register. Ensure that bits  */
  41 /* 0..3 remain unchanged! For details about Port C Mode Register see         */
  42 /* the remarks in dnp_insn_config() below.                                   */
  43
  44 #define CSCIR 0x22              /* Chip Setup and Control Index Register       */
  45 #define CSCDR 0x23              /* Chip Setup and Control Data Register        */
  46 #define PAMR  0xa5              /* Port A Mode Register                        */
  47 #define PADR  0xa9              /* Port A Data Register                        */
  48 #define PBMR  0xa4              /* Port B Mode Register                        */
  49 #define PBDR  0xa8              /* Port B Data Register                        */
  50 #define PCMR  0xa3              /* Port C Mode Register                        */
  51 #define PCDR  0xa7              /* Port C Data Register                        */
  52
  53 /* This data structure holds information about the supported boards -------- */
  54
  55 typedef struct dnp_board_struct {
  56         const char *name;
  57         int ai_chans;
  58         int ai_bits;
  59         int have_dio;
  60 } dnp_board;
  61
  62 static const dnp_board dnp_boards[] = { /* we only support one DNP 'board'   */
  63         {                       /* variant at the moment             */
  64               name:     "dnp-1486",
  65               ai_chans:16,
  66               ai_bits:  12,
  67               have_dio:1,
  68                 },
  69 };
  70
  71 /* Useful for shorthand access to the particular board structure ----------- */
  72 #define thisboard ((const dnp_board *)dev->board_ptr)
  73
  74 /* This structure is for data unique to the DNP driver --------------------- */
  75 typedef struct {
  76         //
  77 } dnp_private_data;
  78
  79 /* Shorthand macro for faster access to the private data ------------------- */
  80 #define devpriv ((dnp_private *)dev->private)
  81
  82 /* ------------------------------------------------------------------------- */
  83 /* The struct comedi_driver structure tells the Comedi core module which functions  */
  84 /* to call to configure/deconfigure (attach/detach) the board, and also      */
  85 /* about the kernel module that contains the device code.                    */
  86 /*                                                                           */
  87 /* In the following section we define the API of this driver.                */
  88 /* ------------------------------------------------------------------------- */
  89
  90 static int dnp_attach(struct comedi_device * dev, comedi_devconfig * it);
  91 static int dnp_detach(struct comedi_device * dev);
  92
  93 static struct comedi_driver driver_dnp = {
  94       driver_name:"ssv_dnp",
  95       module:THIS_MODULE,
  96       attach:dnp_attach,
  97       detach:dnp_detach,
  98       board_name:&dnp_boards[0].name,
  99         /* only necessary for non-PnP devs   */
 100       offset:sizeof(dnp_board),/* like ISA-PnP, PCI or PCMCIA.      */
 101       num_names:sizeof(dnp_boards) / sizeof(dnp_board),
 102 };
 103
 104 COMEDI_INITCLEANUP(driver_dnp);
 105
 106 static int dnp_dio_insn_bits(struct comedi_device * dev,
 107         struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data);
 108
 109 static int dnp_dio_insn_config(struct comedi_device * dev,
 110         struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data);
 111
 112 /* ------------------------------------------------------------------------- */
 113 /* Attach is called by comedi core to configure the driver for a particular  */
 114 /* board. If you specified a board_name array in the driver structure,       */
 115 /* dev->board_ptr contains that address.                                     */
 116 /* ------------------------------------------------------------------------- */
 117
 118 static int dnp_attach(struct comedi_device * dev, comedi_devconfig * it)
 119 {
 120
 121         struct comedi_subdevice *s;
 122
 123         printk("comedi%d: dnp: ", dev->minor);
 124
 125         /* Autoprobing: this should find out which board we have. Currently only   */
 126         /* the 1486 board is supported and autoprobing is not implemented :-)      */
 127         //dev->board_ptr = dnp_probe(dev);
 128
 129         /* Initialize the name of the board. We can use the "thisboard" macro now. */
 130         dev->board_name = thisboard->name;
 131
 132         /* Allocate the private structure area. alloc_private() is a convenient    */
 133         /* macro defined in comedidev.h.                                           */
 134         if (alloc_private(dev, sizeof(dnp_private_data)) < 0)
 135                 return -ENOMEM;
 136
 137         /* Allocate the subdevice structures. alloc_subdevice() is a convenient    */
 138         /* macro defined in comedidev.h.                                           */
 139
 140         if (alloc_subdevices(dev, 1) < 0)
 141                 return -ENOMEM;
 142
 143         s = dev->subdevices + 0;
 144         /* digital i/o subdevice                                                   */
 145         s->type = COMEDI_SUBD_DIO;
 146         s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
 147         s->n_chan = 20;
 148         s->maxdata = 1;
 149         s->range_table = &range_digital;
 150         s->insn_bits = dnp_dio_insn_bits;
 151         s->insn_config = dnp_dio_insn_config;
 152
 153         printk("attached\n");
 154
 155         /* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always
 156          * allocated for the primary 8259, so we don't need to allocate them
 157          * ourselves. */
 158
 159         /* configure all ports as input (default)                                  */
 160         outb(PAMR, CSCIR);
 161         outb(0x00, CSCDR);
 162         outb(PBMR, CSCIR);
 163         outb(0x00, CSCDR);
 164         outb(PCMR, CSCIR);
 165         outb((inb(CSCDR) & 0xAA), CSCDR);
 166
 167         return 1;
 168
 169 }
 170
 171 /* ------------------------------------------------------------------------- */
 172 /* detach is called to deconfigure a device. It should deallocate the        */
 173 /* resources. This function is also called when _attach() fails, so it       */
 174 /* should be careful not to release resources that were not necessarily      */
 175 /* allocated by _attach(). dev->private and dev->subdevices are              */
 176 /* deallocated automatically by the core.                                    */
 177 /* ------------------------------------------------------------------------- */
 178
 179 static int dnp_detach(struct comedi_device * dev)
 180 {
 181
 182         /* configure all ports as input (default)                                  */
 183         outb(PAMR, CSCIR);
 184         outb(0x00, CSCDR);
 185         outb(PBMR, CSCIR);
 186         outb(0x00, CSCDR);
 187         outb(PCMR, CSCIR);
 188         outb((inb(CSCDR) & 0xAA), CSCDR);
 189
 190         /* announce that we are finished                                           */
 191         printk("comedi%d: dnp: remove\n", dev->minor);
 192
 193         return 0;
 194
 195 }
 196
 197 /* ------------------------------------------------------------------------- */
 198 /* The insn_bits interface allows packed reading/writing of DIO channels.    */
 199 /* The comedi core can convert between insn_bits and insn_read/write, so you */
 200 /* are able to use these instructions as well.                               */
 201 /* ------------------------------------------------------------------------- */
 202
 203 static int dnp_dio_insn_bits(struct comedi_device * dev,
 204         struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data)
 205 {
 206
 207         if (insn->n != 2)
 208                 return -EINVAL; /* insn uses data[0] and data[1]     */
 209
 210         /* The insn data is a mask in data[0] and the new data in data[1], each    */
 211         /* channel cooresponding to a bit.                                         */
 212
 213         /* Ports A and B are straight forward: each bit corresponds to an output   */
 214         /* pin with the same order. Port C is different: bits 0...3 correspond to  */
 215         /* bits 4...7 of the output register (PCDR).                               */
 216
 217         if (data[0]) {
 218
 219                 outb(PADR, CSCIR);
 220                 outb((inb(CSCDR)
 221                                 & ~(u8) (data[0] & 0x0000FF))
 222                         | (u8) (data[1] & 0x0000FF), CSCDR);
 223
 224                 outb(PBDR, CSCIR);
 225                 outb((inb(CSCDR)
 226                                 & ~(u8) ((data[0] & 0x00FF00) >> 8))
 227                         | (u8) ((data[1] & 0x00FF00) >> 8), CSCDR);
 228
 229                 outb(PCDR, CSCIR);
 230                 outb((inb(CSCDR)
 231                                 & ~(u8) ((data[0] & 0x0F0000) >> 12))
 232                         | (u8) ((data[1] & 0x0F0000) >> 12), CSCDR);
 233         }
 234
 235         /* on return, data[1] contains the value of the digital input lines.       */
 236         outb(PADR, CSCIR);
 237         data[0] = inb(CSCDR);
 238         outb(PBDR, CSCIR);
 239         data[0] += inb(CSCDR) << 8;
 240         outb(PCDR, CSCIR);
 241         data[0] += ((inb(CSCDR) & 0xF0) << 12);
 242
 243         return 2;
 244
 245 }
 246
 247 /* ------------------------------------------------------------------------- */
 248 /* Configure the direction of the bidirectional digital i/o pins. chanspec   */
 249 /* contains the channel to be changed and data[0] contains either            */
 250 /* COMEDI_INPUT or COMEDI_OUTPUT.                                            */
 251 /* ------------------------------------------------------------------------- */
 252
 253 static int dnp_dio_insn_config(struct comedi_device * dev,
 254         struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data)
 255 {
 256
 257         u8 register_buffer;
 258
 259         int chan = CR_CHAN(insn->chanspec);     /* reduces chanspec to lower 16 bits */
 260
 261         switch (data[0]) {
 262         case INSN_CONFIG_DIO_OUTPUT:
 263         case INSN_CONFIG_DIO_INPUT:
 264                 break;
 265         case INSN_CONFIG_DIO_QUERY:
 266                 data[1] =
 267                         (inb(CSCDR) & (1 << chan)) ? COMEDI_OUTPUT :
 268                         COMEDI_INPUT;
 269                 return insn->n;
 270                 break;
 271         default:
 272                 return -EINVAL;
 273                 break;
 274         }
 275         /* Test: which port does the channel belong to?                            */
 276
 277         /* We have to pay attention with port C: this is the meaning of PCMR:      */
 278         /* Bit in PCMR:              7 6 5 4 3 2 1 0                               */
 279         /* Corresponding port C pin: d 3 d 2 d 1 d 0   d= don't touch              */
 280
 281         if ((chan >= 0) && (chan <= 7)) {
 282                 /* this is port A */
 283                 outb(PAMR, CSCIR);
 284         } else if ((chan >= 8) && (chan <= 15)) {
 285                 /* this is port B */
 286                 chan -= 8;
 287                 outb(PBMR, CSCIR);
 288         } else if ((chan >= 16) && (chan <= 19)) {
 289                 /* this is port C; multiplication with 2 brings bits into correct        */
 290                 /* position for PCMR!                                                    */
 291                 chan -= 16;
 292                 chan *= 2;
 293                 outb(PCMR, CSCIR);
 294         } else {
 295                 return -EINVAL;
 296         }
 297
 298         /* read 'old' direction of the port and set bits (out=1, in=0)             */
 299         register_buffer = inb(CSCDR);
 300         if (data[0] == COMEDI_OUTPUT) {
 301                 register_buffer |= (1 << chan);
 302         } else {
 303                 register_buffer &= ~(1 << chan);
 304         }
 305         outb(register_buffer, CSCDR);
 306
 307         return 1;
 308
 309 }