drivers/staging/meilhaus/me0600_ttli.c

   1 /**
   2  * @file me0600_ttli.c
   3  *
   4  * @brief ME-630 TTL input subdevice instance.
   5  * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
   6  * @author Guenter Gebhardt
   7  * @author Krzysztof Gantzke    (k.gantzke@meilhaus.de)
   8  */
   9
  10 /*
  11  * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
  12  *
  13  * This file is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #ifndef __KERNEL__
  29 #  define __KERNEL__
  30 #endif
  31
  32 /*
  33  * Includes
  34  */
  35 #include <linux/module.h>
  36
  37 #include <linux/slab.h>
  38 #include <linux/spinlock.h>
  39 #include <asm/io.h>
  40 #include <linux/types.h>
  41
  42 #include "medefines.h"
  43 #include "meinternal.h"
  44 #include "meerror.h"
  45
  46 #include "medebug.h"
  47 #include "me0600_ttli_reg.h"
  48 #include "me0600_ttli.h"
  49
  50 /*
  51  * Defines
  52  */
  53
  54 /*
  55  * Functions
  56  */
  57
  58 static int me0600_ttli_io_reset_subdevice(struct me_subdevice *subdevice,
  59                                           struct file *filep, int flags)
  60 {
  61         if (flags) {
  62                 PERROR("Invalid flag specified.\n");
  63                 return ME_ERRNO_INVALID_FLAGS;
  64         }
  65
  66         PDEBUG("executed.\n");
  67         return ME_ERRNO_SUCCESS;
  68 }
  69
  70 static int me0600_ttli_io_single_config(me_subdevice_t * subdevice,
  71                                         struct file *filep,
  72                                         int channel,
  73                                         int single_config,
  74                                         int ref,
  75                                         int trig_chan,
  76                                         int trig_type, int trig_edge, int flags)
  77 {
  78         me0600_ttli_subdevice_t *instance;
  79         int err = ME_ERRNO_SUCCESS;
  80
  81         PDEBUG("executed.\n");
  82
  83         instance = (me0600_ttli_subdevice_t *) subdevice;
  84
  85         ME_SUBDEVICE_ENTER;
  86
  87         spin_lock(&instance->subdevice_lock);
  88
  89         switch (flags) {
  90         case ME_IO_SINGLE_CONFIG_NO_FLAGS:
  91         case ME_IO_SINGLE_CONFIG_DIO_BYTE:
  92                 if (channel == 0) {
  93                         if (single_config != ME_SINGLE_CONFIG_DIO_INPUT) {
  94                                 PERROR("Invalid port direction specified.\n");
  95                                 err = ME_ERRNO_INVALID_SINGLE_CONFIG;
  96                         }
  97                 } else {
  98                         PERROR("Invalid channel specified.\n");
  99                         err = ME_ERRNO_INVALID_CHANNEL;
 100                 }
 101
 102                 break;
 103
 104         default:
 105                 PERROR("Invalid flags specified.\n");
 106
 107                 err = ME_ERRNO_INVALID_FLAGS;
 108
 109                 break;
 110         }
 111
 112         spin_unlock(&instance->subdevice_lock);
 113
 114         ME_SUBDEVICE_EXIT;
 115
 116         return err;
 117 }
 118
 119 static int me0600_ttli_io_single_read(me_subdevice_t * subdevice,
 120                                       struct file *filep,
 121                                       int channel,
 122                                       int *value, int time_out, int flags)
 123 {
 124         me0600_ttli_subdevice_t *instance;
 125         int err = ME_ERRNO_SUCCESS;
 126
 127         PDEBUG("executed.\n");
 128
 129         instance = (me0600_ttli_subdevice_t *) subdevice;
 130
 131         ME_SUBDEVICE_ENTER;
 132
 133         spin_lock(&instance->subdevice_lock);
 134
 135         switch (flags) {
 136         case ME_IO_SINGLE_TYPE_DIO_BIT:
 137                 if ((channel >= 0) && (channel < 8)) {
 138                         *value = inb(instance->port_reg) & (0x1 << channel);
 139                 } else {
 140                         PERROR("Invalid bit number specified.\n");
 141                         err = ME_ERRNO_INVALID_CHANNEL;
 142                 }
 143                 break;
 144
 145         case ME_IO_SINGLE_NO_FLAGS:
 146         case ME_IO_SINGLE_TYPE_DIO_BYTE:
 147                 if (channel == 0) {
 148                         *value = inb(instance->port_reg);
 149                 } else {
 150                         PERROR("Invalid byte number specified.\n");
 151                         err = ME_ERRNO_INVALID_CHANNEL;
 152                 }
 153                 break;
 154
 155         default:
 156                 PERROR("Invalid flags specified.\n");
 157                 err = ME_ERRNO_INVALID_FLAGS;
 158         }
 159
 160         spin_unlock(&instance->subdevice_lock);
 161
 162         ME_SUBDEVICE_EXIT;
 163
 164         return err;
 165 }
 166
 167 static int me0600_ttli_query_number_channels(me_subdevice_t * subdevice,
 168                                              int *number)
 169 {
 170         PDEBUG("executed.\n");
 171         *number = 8;
 172         return ME_ERRNO_SUCCESS;
 173 }
 174
 175 static int me0600_ttli_query_subdevice_type(me_subdevice_t * subdevice,
 176                                             int *type, int *subtype)
 177 {
 178         PDEBUG("executed.\n");
 179         *type = ME_TYPE_DI;
 180         *subtype = ME_SUBTYPE_SINGLE;
 181         return ME_ERRNO_SUCCESS;
 182 }
 183
 184 static int me0600_ttli_query_subdevice_caps(me_subdevice_t * subdevice,
 185                                             int *caps)
 186 {
 187         PDEBUG("executed.\n");
 188         *caps = 0;
 189         return ME_ERRNO_SUCCESS;
 190 }
 191
 192 me0600_ttli_subdevice_t *me0600_ttli_constructor(uint32_t reg_base)
 193 {
 194         me0600_ttli_subdevice_t *subdevice;
 195         int err;
 196
 197         PDEBUG("executed.\n");
 198
 199         /* Allocate memory for subdevice instance */
 200         subdevice = kmalloc(sizeof(me0600_ttli_subdevice_t), GFP_KERNEL);
 201
 202         if (!subdevice) {
 203                 PERROR("Cannot get memory for subdevice instance.\n");
 204                 return NULL;
 205         }
 206
 207         memset(subdevice, 0, sizeof(me0600_ttli_subdevice_t));
 208
 209         /* Initialize subdevice base class */
 210         err = me_subdevice_init(&subdevice->base);
 211
 212         if (err) {
 213                 PERROR("Cannot initialize subdevice base class instance.\n");
 214                 kfree(subdevice);
 215                 return NULL;
 216         }
 217         // Initialize spin locks.
 218         spin_lock_init(&subdevice->subdevice_lock);
 219
 220         /* Save the subdevice index */
 221         subdevice->port_reg = reg_base + ME0600_TTL_INPUT_REG;
 222
 223         /* Overload base class methods. */
 224         subdevice->base.me_subdevice_io_reset_subdevice =
 225             me0600_ttli_io_reset_subdevice;
 226         subdevice->base.me_subdevice_io_single_config =
 227             me0600_ttli_io_single_config;
 228         subdevice->base.me_subdevice_io_single_read =
 229             me0600_ttli_io_single_read;
 230         subdevice->base.me_subdevice_query_number_channels =
 231             me0600_ttli_query_number_channels;
 232         subdevice->base.me_subdevice_query_subdevice_type =
 233             me0600_ttli_query_subdevice_type;
 234         subdevice->base.me_subdevice_query_subdevice_caps =
 235             me0600_ttli_query_subdevice_caps;
 236
 237         return subdevice;
 238 }