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/*
comedi/drivers/comedi_fc.c
This is a place for code driver writers wish to share between
two or more drivers. fc is short
for frank-common.
Author: Frank Mori Hess <fmhess@users.sourceforge.net>
Copyright (C) 2002 Frank Mori Hess
This program 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.
************************************************************************/
#include "../comedidev.h"
#include "comedi_fc.h"
static void increment_scan_progress(struct comedi_subdevice *subd,
unsigned int num_bytes)
{
struct comedi_async *async = subd->async;
unsigned int scan_length = cfc_bytes_per_scan(subd);
async->scan_progress += num_bytes;
if (async->scan_progress >= scan_length) {
async->scan_progress %= scan_length;
async->events |= COMEDI_CB_EOS;
}
}
/* Writes an array of data points to comedi's buffer */
unsigned int cfc_write_array_to_buffer(struct comedi_subdevice *subd, void *data,
unsigned int num_bytes)
{
struct comedi_async *async = subd->async;
unsigned int retval;
if (num_bytes == 0)
return 0;
retval = comedi_buf_write_alloc(async, num_bytes);
if (retval != num_bytes) {
printk("comedi: buffer overrun\n");
async->events |= COMEDI_CB_OVERFLOW;
return 0;
}
comedi_buf_memcpy_to(async, 0, data, num_bytes);
comedi_buf_write_free(async, num_bytes);
increment_scan_progress(subd, num_bytes);
async->events |= COMEDI_CB_BLOCK;
return num_bytes;
}
EXPORT_SYMBOL(cfc_write_array_to_buffer);
unsigned int cfc_read_array_from_buffer(struct comedi_subdevice *subd, void *data,
unsigned int num_bytes)
{
struct comedi_async *async = subd->async;
if (num_bytes == 0)
return 0;
num_bytes = comedi_buf_read_alloc(async, num_bytes);
comedi_buf_memcpy_from(async, 0, data, num_bytes);
comedi_buf_read_free(async, num_bytes);
increment_scan_progress(subd, num_bytes);
async->events |= COMEDI_CB_BLOCK;
return num_bytes;
}
EXPORT_SYMBOL(cfc_read_array_from_buffer);
unsigned int cfc_handle_events(struct comedi_device *dev, struct comedi_subdevice *subd)
{
unsigned int events = subd->async->events;
if (events == 0)
return events;
if (events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW))
subd->cancel(dev, subd);
comedi_event(dev, subd);
return events;
}
EXPORT_SYMBOL(cfc_handle_events);
MODULE_AUTHOR("Frank Mori Hess <fmhess@users.sourceforge.net>");
MODULE_DESCRIPTION("Shared functions for Comedi low-level drivers");
MODULE_LICENSE("GPL");
static int __init comedi_fc_init_module(void)
{
return 0;
}
static void __exit comedi_fc_cleanup_module(void)
{
}
module_init(comedi_fc_init_module);
module_exit(comedi_fc_cleanup_module);
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