4 This is a place for code driver writers wish to share between
5 two or more drivers. These functions are meant to be used only
6 by drivers, they are NOT part of the kcomedilib API!
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 ************************************************************************/
30 #include "../comedidev.h"
32 /* Writes an array of data points to comedi's buffer */
33 extern unsigned int cfc_write_array_to_buffer(struct comedi_subdevice
*subd
,
35 unsigned int num_bytes
);
37 static inline unsigned int cfc_write_to_buffer(struct comedi_subdevice
*subd
,
40 return cfc_write_array_to_buffer(subd
, &data
, sizeof(data
));
43 static inline unsigned int cfc_write_long_to_buffer(struct comedi_subdevice
44 *subd
, unsigned int data
)
46 return cfc_write_array_to_buffer(subd
, &data
, sizeof(data
));
49 extern unsigned int cfc_read_array_from_buffer(struct comedi_subdevice
*subd
,
51 unsigned int num_bytes
);
53 extern unsigned int cfc_handle_events(struct comedi_device
*dev
,
54 struct comedi_subdevice
*subd
);
56 static inline unsigned int cfc_bytes_per_scan(struct comedi_subdevice
*subd
)
65 bits_per_sample
= 8 * bytes_per_sample(subd
);
66 num_samples
= (subd
->async
->cmd
.chanlist_len
+
67 bits_per_sample
- 1) / bits_per_sample
;
70 num_samples
= subd
->async
->cmd
.chanlist_len
;
73 return num_samples
* bytes_per_sample(subd
);
77 * cfc_check_trigger_src() - trivially validate a comedi_cmd trigger source
78 * @src: pointer to the trigger source to validate
79 * @flags: bitmask of valid TRIG_* for the trigger
81 * This is used in "step 1" of the do_cmdtest functions of comedi drivers
82 * to vaildate the comedi_cmd triggers. The mask of the @src against the
83 * @flags allows the userspace comedilib to pass all the comedi_cmd
84 * triggers as TRIG_ANY and get back a bitmask of the valid trigger sources.
86 static inline int cfc_check_trigger_src(unsigned int *src
, unsigned int flags
)
88 unsigned int orig_src
= *src
;
90 *src
= orig_src
& flags
;
91 if (*src
== TRIG_INVALID
|| *src
!= orig_src
)
97 * cfc_check_trigger_is_unique() - make sure a trigger source is unique
98 * @src: the trigger source to check
100 static inline int cfc_check_trigger_is_unique(unsigned int src
)
102 /* this test is true if more than one _src bit is set */
103 if ((src
& (src
- 1)) != 0)
109 * cfc_check_trigger_arg_is() - trivially validate a trigger argument
110 * @arg: pointer to the trigger arg to validate
111 * @val: the value the argument should be
113 static inline int cfc_check_trigger_arg_is(unsigned int *arg
, unsigned int val
)
123 * cfc_check_trigger_arg_min() - trivially validate a trigger argument
124 * @arg: pointer to the trigger arg to validate
125 * @val: the minimum value the argument should be
127 static inline int cfc_check_trigger_arg_min(unsigned int *arg
,
138 * cfc_check_trigger_arg_max() - trivially validate a trigger argument
139 * @arg: pointer to the trigger arg to validate
140 * @val: the maximum value the argument should be
142 static inline int cfc_check_trigger_arg_max(unsigned int *arg
,
152 #endif /* _COMEDI_FC_H */