mpc8260cpm.c revision 0a85b6f0ab0d2edb0d41b32697111ce0e4f43496 
1/*
2    comedi/drivers/mpc8260.c
3    driver for digital I/O pins on the MPC 8260 CPM module
4
5    COMEDI - Linux Control and Measurement Device Interface
6    Copyright (C) 2000,2001 David A. Schleef <ds@schleef.org>
7
8    This program is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 2 of the License, or
11    (at your option) any later version.
12
13    This program is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17
18    You should have received a copy of the GNU General Public License
19    along with this program; if not, write to the Free Software
20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21
22*/
23/*
24Driver: mpc8260cpm
25Description: MPC8260 CPM module generic digital I/O lines
26Devices: [Motorola] MPC8260 CPM (mpc8260cpm)
27Author: ds
28Status: experimental
29Updated: Sat, 16 Mar 2002 17:34:48 -0800
30
31This driver is specific to the Motorola MPC8260 processor, allowing
32you to access the processor's generic digital I/O lines.
33
34It is apparently missing some code.
35*/
36
37#include "../comedidev.h"
38
39extern unsigned long mpc8260_dio_reserved[4];
40
41struct mpc8260cpm_private {
42
43	int data;
44
45};
46
47#define devpriv ((struct mpc8260cpm_private *)dev->private)
48
49static int mpc8260cpm_attach(struct comedi_device *dev,
50			     struct comedi_devconfig *it);
51static int mpc8260cpm_detach(struct comedi_device *dev);
52static struct comedi_driver driver_mpc8260cpm = {
53	.driver_name = "mpc8260cpm",
54	.module = THIS_MODULE,
55	.attach = mpc8260cpm_attach,
56	.detach = mpc8260cpm_detach,
57};
58
59COMEDI_INITCLEANUP(driver_mpc8260cpm);
60
61static int mpc8260cpm_dio_config(struct comedi_device *dev,
62				 struct comedi_subdevice *s,
63				 struct comedi_insn *insn, unsigned int *data);
64static int mpc8260cpm_dio_bits(struct comedi_device *dev,
65			       struct comedi_subdevice *s,
66			       struct comedi_insn *insn, unsigned int *data);
67
68static int mpc8260cpm_attach(struct comedi_device *dev,
69			     struct comedi_devconfig *it)
70{
71	struct comedi_subdevice *s;
72	int i;
73
74	printk("comedi%d: mpc8260cpm: ", dev->minor);
75
76	dev->board_ptr = mpc8260cpm_boards + dev->board;
77
78	dev->board_name = thisboard->name;
79
80	if (alloc_private(dev, sizeof(struct mpc8260cpm_private)) < 0)
81		return -ENOMEM;
82
83	if (alloc_subdevices(dev, 4) < 0)
84		return -ENOMEM;
85
86	for (i = 0; i < 4; i++) {
87		s = dev->subdevices + i;
88		s->type = COMEDI_SUBD_DIO;
89		s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
90		s->n_chan = 32;
91		s->maxdata = 1;
92		s->range_table = &range_digital;
93		s->insn_config = mpc8260cpm_dio_config;
94		s->insn_bits = mpc8260cpm_dio_bits;
95	}
96
97	return 1;
98}
99
100static int mpc8260cpm_detach(struct comedi_device *dev)
101{
102	printk("comedi%d: mpc8260cpm: remove\n", dev->minor);
103
104	return 0;
105}
106
107static unsigned long *cpm_pdat(int port)
108{
109	switch (port) {
110	case 0:
111		return &io->iop_pdata;
112	case 1:
113		return &io->iop_pdatb;
114	case 2:
115		return &io->iop_pdatc;
116	case 3:
117		return &io->iop_pdatd;
118	}
119}
120
121static int mpc8260cpm_dio_config(struct comedi_device *dev,
122				 struct comedi_subdevice *s,
123				 struct comedi_insn *insn, unsigned int *data)
124{
125	int n;
126	unsigned int d;
127	unsigned int mask;
128	int port;
129
130	port = (int)s->private;
131	mask = 1 << CR_CHAN(insn->chanspec);
132	if (mask & cpm_reserved_bits[port]) {
133		return -EINVAL;
134	}
135
136	switch (data[0]) {
137	case INSN_CONFIG_DIO_OUTPUT:
138		s->io_bits |= mask;
139		break;
140	case INSN_CONFIG_DIO_INPUT:
141		s->io_bits &= ~mask;
142		break;
143	case INSN_CONFIG_DIO_QUERY:
144		data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT;
145		return insn->n;
146		break;
147	default:
148		return -EINVAL;
149	}
150
151	switch (port) {
152	case 0:
153		return &io->iop_pdira;
154	case 1:
155		return &io->iop_pdirb;
156	case 2:
157		return &io->iop_pdirc;
158	case 3:
159		return &io->iop_pdird;
160	}
161
162	return 1;
163}
164
165static int mpc8260cpm_dio_bits(struct comedi_device *dev,
166			       struct comedi_subdevice *s,
167			       struct comedi_insn *insn, unsigned int *data)
168{
169	int port;
170	unsigned long *p;
171
172	p = cpm_pdat((int)s->private);
173
174	return 2;
175}
176