2 comedi/drivers/comedi_fc.c
4 This is a place for code driver writers wish to share between
5 two or more drivers. fc is short
8 Author: Frank Mori Hess <fmhess@users.sourceforge.net>
9 Copyright (C) 2002 Frank Mori Hess
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 ************************************************************************/
27 #include "../comedidev.h"
29 #include "comedi_fc.h"
31 static void increment_scan_progress(struct comedi_subdevice
*subd
,
32 unsigned int num_bytes
)
34 struct comedi_async
*async
= subd
->async
;
35 unsigned int scan_length
= cfc_bytes_per_scan(subd
);
37 async
->scan_progress
+= num_bytes
;
38 if (async
->scan_progress
>= scan_length
) {
39 async
->scan_progress
%= scan_length
;
40 async
->events
|= COMEDI_CB_EOS
;
44 /* Writes an array of data points to comedi's buffer */
45 unsigned int cfc_write_array_to_buffer(struct comedi_subdevice
*subd
,
46 void *data
, unsigned int num_bytes
)
48 struct comedi_async
*async
= subd
->async
;
54 retval
= comedi_buf_write_alloc(async
, num_bytes
);
55 if (retval
!= num_bytes
) {
56 printk(KERN_WARNING
"comedi: buffer overrun\n");
57 async
->events
|= COMEDI_CB_OVERFLOW
;
61 comedi_buf_memcpy_to(async
, 0, data
, num_bytes
);
62 comedi_buf_write_free(async
, num_bytes
);
63 increment_scan_progress(subd
, num_bytes
);
64 async
->events
|= COMEDI_CB_BLOCK
;
68 EXPORT_SYMBOL(cfc_write_array_to_buffer
);
70 unsigned int cfc_read_array_from_buffer(struct comedi_subdevice
*subd
,
71 void *data
, unsigned int num_bytes
)
73 struct comedi_async
*async
= subd
->async
;
78 num_bytes
= comedi_buf_read_alloc(async
, num_bytes
);
79 comedi_buf_memcpy_from(async
, 0, data
, num_bytes
);
80 comedi_buf_read_free(async
, num_bytes
);
81 increment_scan_progress(subd
, num_bytes
);
82 async
->events
|= COMEDI_CB_BLOCK
;
86 EXPORT_SYMBOL(cfc_read_array_from_buffer
);
88 unsigned int cfc_handle_events(struct comedi_device
*dev
,
89 struct comedi_subdevice
*subd
)
91 unsigned int events
= subd
->async
->events
;
96 if (events
& (COMEDI_CB_EOA
| COMEDI_CB_ERROR
| COMEDI_CB_OVERFLOW
))
97 subd
->cancel(dev
, subd
);
99 comedi_event(dev
, subd
);
103 EXPORT_SYMBOL(cfc_handle_events
);
105 MODULE_AUTHOR("Frank Mori Hess <fmhess@users.sourceforge.net>");
106 MODULE_DESCRIPTION("Shared functions for Comedi low-level drivers");
107 MODULE_LICENSE("GPL");
109 static int __init
comedi_fc_init_module(void)
114 static void __exit
comedi_fc_cleanup_module(void)
118 module_init(comedi_fc_init_module
);
119 module_exit(comedi_fc_cleanup_module
);