| /* |
| kcomedilib/data.c |
| implements comedi_data_*() functions |
| |
| COMEDI - Linux Control and Measurement Device Interface |
| Copyright (C) 2000 David A. Schleef <ds@schleef.org> |
| |
| 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 "../comedi.h" |
| #include "../comedilib.h" |
| #include "../comedidev.h" |
| |
| #include <linux/string.h> |
| #include <linux/delay.h> |
| |
| int comedi_data_write(void *dev, unsigned int subdev, unsigned int chan, |
| unsigned int range, unsigned int aref, unsigned int data) |
| { |
| struct comedi_insn insn; |
| |
| memset(&insn, 0, sizeof(insn)); |
| insn.insn = INSN_WRITE; |
| insn.n = 1; |
| insn.data = &data; |
| insn.subdev = subdev; |
| insn.chanspec = CR_PACK(chan, range, aref); |
| |
| return comedi_do_insn(dev, &insn); |
| } |
| |
| int comedi_data_read(void *dev, unsigned int subdev, unsigned int chan, |
| unsigned int range, unsigned int aref, unsigned int *data) |
| { |
| struct comedi_insn insn; |
| |
| memset(&insn, 0, sizeof(insn)); |
| insn.insn = INSN_READ; |
| insn.n = 1; |
| insn.data = data; |
| insn.subdev = subdev; |
| insn.chanspec = CR_PACK(chan, range, aref); |
| |
| return comedi_do_insn(dev, &insn); |
| } |
| |
| int comedi_data_read_hint(void *dev, unsigned int subdev, |
| unsigned int chan, unsigned int range, |
| unsigned int aref) |
| { |
| struct comedi_insn insn; |
| unsigned int dummy_data; |
| |
| memset(&insn, 0, sizeof(insn)); |
| insn.insn = INSN_READ; |
| insn.n = 0; |
| insn.data = &dummy_data; |
| insn.subdev = subdev; |
| insn.chanspec = CR_PACK(chan, range, aref); |
| |
| return comedi_do_insn(dev, &insn); |
| } |
| |
| int comedi_data_read_delayed(void *dev, unsigned int subdev, |
| unsigned int chan, unsigned int range, |
| unsigned int aref, unsigned int *data, |
| unsigned int nano_sec) |
| { |
| int retval; |
| |
| retval = comedi_data_read_hint(dev, subdev, chan, range, aref); |
| if (retval < 0) |
| return retval; |
| |
| udelay((nano_sec + 999) / 1000); |
| |
| return comedi_data_read(dev, subdev, chan, range, aref, data); |
| } |