drivers/staging/meilhaus/me0900_di.c

   1 /**
   2  * @file me0900_di.c
   3  *
   4  * @brief ME-9x digital input subdevice instance.
   5  * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
   6  * @author Guenter Gebhardt
   7  */
   8
   9 /*
  10  * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
  11  *
  12  * This file is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26
  27 #ifndef __KERNEL__
  28 #  define __KERNEL__
  29 #endif
  30
  31 /*
  32  * Includes
  33  */
  34 #include <linux/module.h>
  35
  36 #include <linux/slab.h>
  37 #include <linux/spinlock.h>
  38 #include <asm/io.h>
  39 #include <linux/types.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/version.h>
  42
  43 #include "medefines.h"
  44 #include "meinternal.h"
  45 #include "meerror.h"
  46
  47 #include "meids.h"
  48 #include "medebug.h"
  49 #include "meplx_reg.h"
  50 #include "me0900_reg.h"
  51 #include "me0900_di.h"
  52
  53 /*
  54  * Defines
  55  */
  56
  57 /*
  58  * Functions
  59  */
  60
  61 static int me0900_di_io_reset_subdevice(struct me_subdevice *subdevice,
  62                                         struct file *filep, int flags)
  63 {
  64         PDEBUG("executed.\n");
  65
  66         if (flags) {
  67                 PERROR("Invalid flag specified.\n");
  68                 return ME_ERRNO_INVALID_FLAGS;
  69         }
  70
  71         return ME_ERRNO_SUCCESS;
  72 }
  73
  74 static int me0900_di_io_single_config(me_subdevice_t * subdevice,
  75                                       struct file *filep,
  76                                       int channel,
  77                                       int single_config,
  78                                       int ref,
  79                                       int trig_chan,
  80                                       int trig_type, int trig_edge, int flags)
  81 {
  82         me0900_di_subdevice_t *instance;
  83         int err = ME_ERRNO_SUCCESS;
  84
  85         PDEBUG("executed.\n");
  86
  87         instance = (me0900_di_subdevice_t *) subdevice;
  88
  89         ME_SUBDEVICE_ENTER;
  90
  91         spin_lock(&instance->subdevice_lock);
  92         switch (flags) {
  93         case ME_IO_SINGLE_CONFIG_NO_FLAGS:
  94         case ME_IO_SINGLE_TYPE_DIO_BYTE:
  95                 if (channel == 0) {
  96                         if (single_config == ME_SINGLE_CONFIG_DIO_INPUT) {
  97                         } else {
  98                                 PERROR("Invalid byte direction specified.\n");
  99                                 err = ME_ERRNO_INVALID_SINGLE_CONFIG;
 100                         }
 101                 } else {
 102                         PERROR("Invalid byte number specified.\n");
 103                         err = ME_ERRNO_INVALID_CHANNEL;
 104                 }
 105                 break;
 106
 107         default:
 108                 PERROR("Invalid flags specified.\n");
 109                 err = ME_ERRNO_INVALID_FLAGS;
 110         }
 111         spin_unlock(&instance->subdevice_lock);
 112
 113         ME_SUBDEVICE_EXIT;
 114
 115         return err;
 116 }
 117
 118 static int me0900_di_io_single_read(me_subdevice_t * subdevice,
 119                                     struct file *filep,
 120                                     int channel,
 121                                     int *value, int time_out, int flags)
 122 {
 123         me0900_di_subdevice_t *instance;
 124         int err = ME_ERRNO_SUCCESS;
 125
 126         PDEBUG("executed.\n");
 127
 128         instance = (me0900_di_subdevice_t *) subdevice;
 129
 130         ME_SUBDEVICE_ENTER;
 131
 132         spin_lock(&instance->subdevice_lock);
 133         switch (flags) {
 134         case ME_IO_SINGLE_TYPE_DIO_BIT:
 135                 if ((channel >= 0) && (channel < 8)) {
 136                         *value = (~inb(instance->port_reg)) & (0x1 << channel);
 137                 } else {
 138                         PERROR("Invalid bit number specified.\n");
 139                         err = ME_ERRNO_INVALID_CHANNEL;
 140                 }
 141                 break;
 142
 143         case ME_IO_SINGLE_NO_FLAGS:
 144         case ME_IO_SINGLE_TYPE_DIO_BYTE:
 145                 if (channel == 0) {
 146                         *value = ~inb(instance->port_reg);
 147                 } else {
 148                         PERROR("Invalid byte number specified.\n");
 149                         err = ME_ERRNO_INVALID_CHANNEL;
 150                 }
 151                 break;
 152
 153         default:
 154                 PERROR("Invalid flags specified.\n");
 155                 err = ME_ERRNO_INVALID_FLAGS;
 156         }
 157         spin_unlock(&instance->subdevice_lock);
 158
 159         ME_SUBDEVICE_EXIT;
 160
 161         return err;
 162 }
 163
 164 static int me0900_di_query_number_channels(me_subdevice_t * subdevice,
 165                                            int *number)
 166 {
 167         PDEBUG("executed.\n");
 168         *number = 8;
 169         return ME_ERRNO_SUCCESS;
 170 }
 171
 172 static int me0900_di_query_subdevice_type(me_subdevice_t * subdevice,
 173                                           int *type, int *subtype)
 174 {
 175         PDEBUG("executed.\n");
 176         *type = ME_TYPE_DI;
 177         *subtype = ME_SUBTYPE_SINGLE;
 178         return ME_ERRNO_SUCCESS;
 179 }
 180
 181 static int me0900_di_query_subdevice_caps(me_subdevice_t * subdevice, int *caps)
 182 {
 183         PDEBUG("executed.\n");
 184         *caps = 0;
 185         return ME_ERRNO_SUCCESS;
 186 }
 187
 188 me0900_di_subdevice_t *me0900_di_constructor(uint32_t reg_base,
 189                                              unsigned int di_idx)
 190 {
 191         me0900_di_subdevice_t *subdevice;
 192         int err;
 193
 194         PDEBUG("executed.\n");
 195
 196         /* Allocate memory for subdevice instance */
 197         subdevice = kmalloc(sizeof(me0900_di_subdevice_t), GFP_KERNEL);
 198
 199         if (!subdevice) {
 200                 PERROR("Cannot get memory for subdevice instance.\n");
 201                 return NULL;
 202         }
 203
 204         memset(subdevice, 0, sizeof(me0900_di_subdevice_t));
 205
 206         /* Initialize subdevice base class */
 207         err = me_subdevice_init(&subdevice->base);
 208
 209         if (err) {
 210                 PERROR("Cannot initialize subdevice base class instance.\n");
 211                 kfree(subdevice);
 212                 return NULL;
 213         }
 214         // Initialize spin locks.
 215         spin_lock_init(&subdevice->subdevice_lock);
 216
 217         /* Save the subdevice index. */
 218         subdevice->di_idx = di_idx;
 219
 220         /* Initialize registers */
 221         if (di_idx == 0) {
 222                 subdevice->ctrl_reg = reg_base + ME0900_CTRL_REG;
 223                 subdevice->port_reg = reg_base + ME0900_PORT_A_REG;
 224         } else {
 225                 subdevice->ctrl_reg = reg_base + ME0900_CTRL_REG;
 226                 subdevice->port_reg = reg_base + ME0900_PORT_B_REG;
 227         }
 228 #ifdef MEDEBUG_DEBUG_REG
 229         subdevice->reg_base = reg_base;
 230 #endif
 231
 232         /* Overload base class methods. */
 233         subdevice->base.me_subdevice_io_reset_subdevice =
 234             me0900_di_io_reset_subdevice;
 235         subdevice->base.me_subdevice_io_single_config =
 236             me0900_di_io_single_config;
 237         subdevice->base.me_subdevice_io_single_read = me0900_di_io_single_read;
 238         subdevice->base.me_subdevice_query_number_channels =
 239             me0900_di_query_number_channels;
 240         subdevice->base.me_subdevice_query_subdevice_type =
 241             me0900_di_query_subdevice_type;
 242         subdevice->base.me_subdevice_query_subdevice_caps =
 243             me0900_di_query_subdevice_caps;
 244
 245         return subdevice;
 246 }