diff options
Diffstat (limited to 'drivers/staging/meilhaus/me0600_optoi.c')
| -rw-r--r-- | drivers/staging/meilhaus/me0600_optoi.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/drivers/staging/meilhaus/me0600_optoi.c b/drivers/staging/meilhaus/me0600_optoi.c new file mode 100644 index 000000000000..b6d977f228ca --- /dev/null +++ b/drivers/staging/meilhaus/me0600_optoi.c @@ -0,0 +1,243 @@ +/** + * @file me0600_optoi.c + * + * @brief ME-630 Optoisolated input subdevice instance. + * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de) + * @author Guenter Gebhardt + * @author Krzysztof Gantzke (k.gantzke@meilhaus.de) + */ + +/* + * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de) + * + * This file is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#ifndef __KERNEL__ +# define __KERNEL__ +#endif + +/* + * Includes + */ +#include <linux/module.h> + +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <asm/io.h> +#include <linux/types.h> + +#include "medefines.h" +#include "meinternal.h" +#include "meerror.h" + +#include "medebug.h" +#include "me0600_optoi_reg.h" +#include "me0600_optoi.h" + +/* + * Defines + */ + +/* + * Functions + */ + +static int me0600_optoi_io_reset_subdevice(struct me_subdevice *subdevice, + struct file *filep, int flags) +{ + + if (flags) { + PERROR("Invalid flag specified.\n"); + return ME_ERRNO_INVALID_FLAGS; + } + + PDEBUG("executed.\n"); + return ME_ERRNO_SUCCESS; +} + +static int me0600_optoi_io_single_config(me_subdevice_t * subdevice, + struct file *filep, + int channel, + int single_config, + int ref, + int trig_chan, + int trig_type, + int trig_edge, int flags) +{ + me0600_optoi_subdevice_t *instance; + int err = ME_ERRNO_SUCCESS; + + PDEBUG("executed.\n"); + + instance = (me0600_optoi_subdevice_t *) subdevice; + + ME_SUBDEVICE_ENTER; + + spin_lock(&instance->subdevice_lock); + + switch (flags) { + case ME_IO_SINGLE_CONFIG_NO_FLAGS: + case ME_IO_SINGLE_CONFIG_DIO_BYTE: + if (channel == 0) { + if (single_config != ME_SINGLE_CONFIG_DIO_INPUT) { + PERROR("Invalid port direction specified.\n"); + err = ME_ERRNO_INVALID_SINGLE_CONFIG; + } + } else { + PERROR("Invalid channel specified.\n"); + err = ME_ERRNO_INVALID_CHANNEL; + } + + break; + + default: + PERROR("Invalid flags specified.\n"); + + err = ME_ERRNO_INVALID_FLAGS; + + break; + } + + spin_unlock(&instance->subdevice_lock); + + ME_SUBDEVICE_EXIT; + + return err; +} + +static int me0600_optoi_io_single_read(me_subdevice_t * subdevice, + struct file *filep, + int channel, + int *value, int time_out, int flags) +{ + me0600_optoi_subdevice_t *instance; + int err = ME_ERRNO_SUCCESS; + + PDEBUG("executed.\n"); + + instance = (me0600_optoi_subdevice_t *) subdevice; + + ME_SUBDEVICE_ENTER; + + spin_lock(&instance->subdevice_lock); + + switch (flags) { + case ME_IO_SINGLE_TYPE_DIO_BIT: + if ((channel >= 0) && (channel < 8)) { + *value = inb(instance->port_reg) & (0x1 << channel); + } else { + PERROR("Invalid bit number specified.\n"); + err = ME_ERRNO_INVALID_CHANNEL; + } + + break; + + case ME_IO_SINGLE_NO_FLAGS: + case ME_IO_SINGLE_TYPE_DIO_BYTE: + if (channel == 0) { + *value = inb(instance->port_reg); + } else { + PERROR("Invalid byte number specified.\n"); + err = ME_ERRNO_INVALID_CHANNEL; + } + + break; + + default: + PERROR("Invalid flags specified.\n"); + + err = ME_ERRNO_INVALID_FLAGS; + } + + spin_unlock(&instance->subdevice_lock); + + ME_SUBDEVICE_EXIT; + + return err; +} + +static int me0600_optoi_query_number_channels(me_subdevice_t * subdevice, + int *number) +{ + PDEBUG("executed.\n"); + *number = 8; + return ME_ERRNO_SUCCESS; +} + +static int me0600_optoi_query_subdevice_type(me_subdevice_t * subdevice, + int *type, int *subtype) +{ + PDEBUG("executed.\n"); + *type = ME_TYPE_DI; + *subtype = ME_SUBTYPE_SINGLE; + return ME_ERRNO_SUCCESS; +} + +static int me0600_optoi_query_subdevice_caps(me_subdevice_t * subdevice, + int *caps) +{ + PDEBUG("executed.\n"); + *caps = 0; + return ME_ERRNO_SUCCESS; +} + +me0600_optoi_subdevice_t *me0600_optoi_constructor(uint32_t reg_base) +{ + me0600_optoi_subdevice_t *subdevice; + int err; + + PDEBUG("executed.\n"); + + /* Allocate memory for subdevice instance */ + subdevice = kmalloc(sizeof(me0600_optoi_subdevice_t), GFP_KERNEL); + + if (!subdevice) { + PERROR("Cannot get memory for subdevice instance.\n"); + return NULL; + } + + memset(subdevice, 0, sizeof(me0600_optoi_subdevice_t)); + + /* Initialize subdevice base class */ + err = me_subdevice_init(&subdevice->base); + + if (err) { + PERROR("Cannot initialize subdevice base class instance.\n"); + kfree(subdevice); + return NULL; + } + // Initialize spin locks. + spin_lock_init(&subdevice->subdevice_lock); + + /* Save the subdevice index */ + subdevice->port_reg = reg_base + ME0600_OPTO_INPUT_REG; + + /* Overload base class methods. */ + subdevice->base.me_subdevice_io_reset_subdevice = + me0600_optoi_io_reset_subdevice; + subdevice->base.me_subdevice_io_single_config = + me0600_optoi_io_single_config; + subdevice->base.me_subdevice_io_single_read = + me0600_optoi_io_single_read; + subdevice->base.me_subdevice_query_number_channels = + me0600_optoi_query_number_channels; + subdevice->base.me_subdevice_query_subdevice_type = + me0600_optoi_query_subdevice_type; + subdevice->base.me_subdevice_query_subdevice_caps = + me0600_optoi_query_subdevice_caps; + + return subdevice; +} |