4 * @brief ME-9x digital input subdevice instance.
5 * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
6 * @author Guenter Gebhardt
10 * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
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.
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.
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.
34 #include <linux/module.h>
36 #include <linux/slab.h>
37 #include <linux/spinlock.h>
39 #include <linux/types.h>
40 #include <linux/interrupt.h>
41 #include <linux/version.h>
43 #include "medefines.h"
44 #include "meinternal.h"
49 #include "meplx_reg.h"
50 #include "me0900_reg.h"
51 #include "me0900_di.h"
61 static int me0900_di_io_reset_subdevice(struct me_subdevice *subdevice,
62 struct file *filep, int flags)
64 PDEBUG("executed.\n");
67 PERROR("Invalid flag specified.\n");
68 return ME_ERRNO_INVALID_FLAGS;
71 return ME_ERRNO_SUCCESS;
74 static int me0900_di_io_single_config(me_subdevice_t *subdevice,
80 int trig_type, int trig_edge, int flags)
82 me0900_di_subdevice_t *instance;
83 int err = ME_ERRNO_SUCCESS;
85 PDEBUG("executed.\n");
87 instance = (me0900_di_subdevice_t *) subdevice;
91 spin_lock(&instance->subdevice_lock);
93 case ME_IO_SINGLE_CONFIG_NO_FLAGS:
94 case ME_IO_SINGLE_TYPE_DIO_BYTE:
96 if (single_config == ME_SINGLE_CONFIG_DIO_INPUT) {
98 PERROR("Invalid byte direction specified.\n");
99 err = ME_ERRNO_INVALID_SINGLE_CONFIG;
102 PERROR("Invalid byte number specified.\n");
103 err = ME_ERRNO_INVALID_CHANNEL;
108 PERROR("Invalid flags specified.\n");
109 err = ME_ERRNO_INVALID_FLAGS;
111 spin_unlock(&instance->subdevice_lock);
118 static int me0900_di_io_single_read(me_subdevice_t *subdevice,
121 int *value, int time_out, int flags)
123 me0900_di_subdevice_t *instance;
124 int err = ME_ERRNO_SUCCESS;
126 PDEBUG("executed.\n");
128 instance = (me0900_di_subdevice_t *) subdevice;
132 spin_lock(&instance->subdevice_lock);
134 case ME_IO_SINGLE_TYPE_DIO_BIT:
135 if ((channel >= 0) && (channel < 8)) {
136 *value = (~inb(instance->port_reg)) & (0x1 << channel);
138 PERROR("Invalid bit number specified.\n");
139 err = ME_ERRNO_INVALID_CHANNEL;
143 case ME_IO_SINGLE_NO_FLAGS:
144 case ME_IO_SINGLE_TYPE_DIO_BYTE:
146 *value = ~inb(instance->port_reg);
148 PERROR("Invalid byte number specified.\n");
149 err = ME_ERRNO_INVALID_CHANNEL;
154 PERROR("Invalid flags specified.\n");
155 err = ME_ERRNO_INVALID_FLAGS;
157 spin_unlock(&instance->subdevice_lock);
164 static int me0900_di_query_number_channels(me_subdevice_t *subdevice,
167 PDEBUG("executed.\n");
169 return ME_ERRNO_SUCCESS;
172 static int me0900_di_query_subdevice_type(me_subdevice_t *subdevice,
173 int *type, int *subtype)
175 PDEBUG("executed.\n");
177 *subtype = ME_SUBTYPE_SINGLE;
178 return ME_ERRNO_SUCCESS;
181 static int me0900_di_query_subdevice_caps(me_subdevice_t *subdevice, int *caps)
183 PDEBUG("executed.\n");
185 return ME_ERRNO_SUCCESS;
188 me0900_di_subdevice_t *me0900_di_constructor(uint32_t reg_base,
191 me0900_di_subdevice_t *subdevice;
194 PDEBUG("executed.\n");
196 /* Allocate memory for subdevice instance */
197 subdevice = kmalloc(sizeof(me0900_di_subdevice_t), GFP_KERNEL);
200 PERROR("Cannot get memory for subdevice instance.\n");
204 memset(subdevice, 0, sizeof(me0900_di_subdevice_t));
206 /* Initialize subdevice base class */
207 err = me_subdevice_init(&subdevice->base);
210 PERROR("Cannot initialize subdevice base class instance.\n");
214 // Initialize spin locks.
215 spin_lock_init(&subdevice->subdevice_lock);
217 /* Save the subdevice index. */
218 subdevice->di_idx = di_idx;
220 /* Initialize registers */
222 subdevice->ctrl_reg = reg_base + ME0900_CTRL_REG;
223 subdevice->port_reg = reg_base + ME0900_PORT_A_REG;
225 subdevice->ctrl_reg = reg_base + ME0900_CTRL_REG;
226 subdevice->port_reg = reg_base + ME0900_PORT_B_REG;
228 #ifdef MEDEBUG_DEBUG_REG
229 subdevice->reg_base = reg_base;
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;