mpc8260cpm.c revision 68c3dbff9fc9f25872408d0e95980d41733d48d0 
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, struct comedi_devconfig *it);
50static int mpc8260cpm_detach(struct comedi_device *dev);
51static struct comedi_driver driver_mpc8260cpm = {
52	.driver_name = "mpc8260cpm",
53	.module = THIS_MODULE,
54	.attach = mpc8260cpm_attach,
55	.detach = mpc8260cpm_detach,
56};
57
58COMEDI_INITCLEANUP(driver_mpc8260cpm);
59
60static int mpc8260cpm_dio_config(struct comedi_device *dev, struct comedi_subdevice *s,
61	struct comedi_insn *insn, unsigned int *data);
62static int mpc8260cpm_dio_bits(struct comedi_device *dev, struct comedi_subdevice *s,
63	struct comedi_insn *insn, unsigned int *data);
64
65static int mpc8260cpm_attach(struct comedi_device *dev, struct comedi_devconfig *it)
66{
67	struct comedi_subdevice *s;
68	int i;
69
70	printk("comedi%d: mpc8260cpm: ", dev->minor);
71
72	dev->board_ptr = mpc8260cpm_boards + dev->board;
73
74	dev->board_name = thisboard->name;
75
76	if (alloc_private(dev, sizeof(struct mpc8260cpm_private)) < 0)
77		return -ENOMEM;
78
79	if (alloc_subdevices(dev, 4) < 0)
80		return -ENOMEM;
81
82	for (i = 0; i < 4; i++) {
83		s = dev->subdevices + i;
84		s->type = COMEDI_SUBD_DIO;
85		s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
86		s->n_chan = 32;
87		s->maxdata = 1;
88		s->range_table = &range_digital;
89		s->insn_config = mpc8260cpm_dio_config;
90		s->insn_bits = mpc8260cpm_dio_bits;
91	}
92
93	return 1;
94}
95
96static int mpc8260cpm_detach(struct comedi_device *dev)
97{
98	printk("comedi%d: mpc8260cpm: remove\n", dev->minor);
99
100	return 0;
101}
102
103static unsigned long *cpm_pdat(int port)
104{
105	switch (port) {
106	case 0:
107		return &io->iop_pdata;
108	case 1:
109		return &io->iop_pdatb;
110	case 2:
111		return &io->iop_pdatc;
112	case 3:
113		return &io->iop_pdatd;
114	}
115}
116
117static int mpc8260cpm_dio_config(struct comedi_device *dev, struct comedi_subdevice *s,
118	struct comedi_insn *insn, unsigned int *data)
119{
120	int n;
121	unsigned int d;
122	unsigned int mask;
123	int port;
124
125	port = (int)s->private;
126	mask = 1 << CR_CHAN(insn->chanspec);
127	if (mask & cpm_reserved_bits[port]) {
128		return -EINVAL;
129	}
130
131	switch (data[0]) {
132	case INSN_CONFIG_DIO_OUTPUT:
133		s->io_bits |= mask;
134		break;
135	case INSN_CONFIG_DIO_INPUT:
136		s->io_bits &= ~mask;
137		break;
138	case INSN_CONFIG_DIO_QUERY:
139		data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT;
140		return insn->n;
141		break;
142	default:
143		return -EINVAL;
144	}
145
146	switch (port) {
147	case 0:
148		return &io->iop_pdira;
149	case 1:
150		return &io->iop_pdirb;
151	case 2:
152		return &io->iop_pdirc;
153	case 3:
154		return &io->iop_pdird;
155	}
156
157	return 1;
158}
159
160static int mpc8260cpm_dio_bits(struct comedi_device *dev, struct comedi_subdevice *s,
161	struct comedi_insn *insn, unsigned int *data)
162{
163	int port;
164	unsigned long *p;
165
166	p = cpm_pdat((int)s->private);
167
168	return 2;
169}
170