pcm3724.c revision 68c3dbff9fc9f25872408d0e95980d41733d48d0 
1/*
2    comedi/drivers/pcm724.c
3
4    Drew Csillag <drew_csillag@yahoo.com>
5
6    hardware driver for Advantech card:
7     card:   PCM-3724
8     driver: pcm3724
9
10    Options for PCM-3724
11     [0] - IO Base
12*/
13/*
14Driver: pcm3724
15Description: Advantech PCM-3724
16Author: Drew Csillag <drew_csillag@yahoo.com>
17Devices: [Advantech] PCM-3724 (pcm724)
18Status: tested
19
20This is driver for digital I/O boards PCM-3724 with 48 DIO.
21It needs 8255.o for operations and only immediate mode is supported.
22See the source for configuration details.
23
24Copy/pasted/hacked from pcm724.c
25*/
26/*
27 * check_driver overrides:
28 *   struct comedi_insn
29 */
30
31#include "../comedidev.h"
32
33#include <linux/ioport.h>
34#include <linux/delay.h>
35
36#include "8255.h"
37
38#define PCM3724_SIZE   16
39#define SIZE_8255	4
40
41#define BUF_C0 0x1
42#define BUF_B0 0x2
43#define BUF_A0 0x4
44#define BUF_C1 0x8
45#define BUF_B1 0x10
46#define BUF_A1 0x20
47
48#define GATE_A0 0x4
49#define GATE_B0	0x2
50#define GATE_C0	0x1
51#define GATE_A1	0x20
52#define GATE_B1	0x10
53#define GATE_C1 0x8
54
55/* from 8255.c */
56#define CR_CW		0x80
57#define _8255_CR 3
58#define CR_B_IO		0x02
59#define CR_B_MODE	0x04
60#define CR_C_IO	        0x09
61#define CR_A_IO		0x10
62#define CR_A_MODE(a)	((a)<<5)
63#define CR_CW		0x80
64
65static int pcm3724_attach(struct comedi_device *dev, struct comedi_devconfig *it);
66static int pcm3724_detach(struct comedi_device *dev);
67
68struct pcm3724_board {
69	const char *name;	/*  driver name */
70	int dio;		/*  num of DIO */
71	int numofports;		/*  num of 8255 subdevices */
72	unsigned int IRQbits;	/*  allowed interrupts */
73	unsigned int io_range;	/*  len of IO space */
74};
75
76/* used to track configured dios */
77struct priv_pcm3724 {
78	int dio_1;
79	int dio_2;
80};
81
82static const struct pcm3724_board boardtypes[] = {
83	{"pcm3724", 48, 2, 0x00fc, PCM3724_SIZE,},
84};
85
86#define n_boardtypes (sizeof(boardtypes)/sizeof(struct pcm3724_board))
87#define this_board ((const struct pcm3724_board *)dev->board_ptr)
88
89static struct comedi_driver driver_pcm3724 = {
90	.driver_name = "pcm3724",
91	.module = THIS_MODULE,
92	.attach = pcm3724_attach,
93	.detach = pcm3724_detach,
94	.board_name = &boardtypes[0].name,
95	.num_names = n_boardtypes,
96	.offset = sizeof(struct pcm3724_board),
97};
98
99COMEDI_INITCLEANUP(driver_pcm3724);
100
101/* (setq c-basic-offset 8) */
102
103static int subdev_8255_cb(int dir, int port, int data, unsigned long arg)
104{
105	unsigned long iobase = arg;
106	unsigned char inbres;
107	/* printk("8255cb %d %d %d %lx\n", dir,port,data,arg); */
108	if (dir) {
109		/* printk("8255 cb   outb(%x, %lx)\n", data, iobase+port); */
110		outb(data, iobase + port);
111		return 0;
112	} else {
113		inbres = inb(iobase + port);
114		/* printk("8255 cb   inb(%lx) = %x\n", iobase+port, inbres); */
115		return inbres;
116	}
117}
118
119static int compute_buffer(int config, int devno, struct comedi_subdevice *s)
120{
121	/* 1 in io_bits indicates output */
122	if (s->io_bits & 0x0000ff) {
123		if (devno == 0) {
124			config |= BUF_A0;
125		} else {
126			config |= BUF_A1;
127		}
128	}
129	if (s->io_bits & 0x00ff00) {
130		if (devno == 0) {
131			config |= BUF_B0;
132		} else {
133			config |= BUF_B1;
134		}
135	}
136	if (s->io_bits & 0xff0000) {
137		if (devno == 0) {
138			config |= BUF_C0;
139		} else {
140			config |= BUF_C1;
141		}
142	}
143	return config;
144}
145
146static void do_3724_config(struct comedi_device *dev, struct comedi_subdevice *s,
147	int chanspec)
148{
149	int config;
150	int buffer_config;
151	unsigned long port_8255_cfg;
152
153	config = CR_CW;
154	buffer_config = 0;
155
156	/* 1 in io_bits indicates output, 1 in config indicates input */
157	if (!(s->io_bits & 0x0000ff)) {
158		config |= CR_A_IO;
159	}
160	if (!(s->io_bits & 0x00ff00)) {
161		config |= CR_B_IO;
162	}
163	if (!(s->io_bits & 0xff0000)) {
164		config |= CR_C_IO;
165	}
166
167	buffer_config = compute_buffer(0, 0, dev->subdevices);
168	buffer_config = compute_buffer(buffer_config, 1, (dev->subdevices) + 1);
169
170	if (s == dev->subdevices) {
171		port_8255_cfg = dev->iobase + _8255_CR;
172	} else {
173		port_8255_cfg = dev->iobase + SIZE_8255 + _8255_CR;
174	}
175	outb(buffer_config, dev->iobase + 8);	/* update buffer register */
176	/* printk("pcm3724 buffer_config (%lx) %d, %x\n", dev->iobase + _8255_CR, chanspec, buffer_config); */
177	outb(config, port_8255_cfg);
178}
179
180static void enable_chan(struct comedi_device *dev, struct comedi_subdevice *s, int chanspec)
181{
182	unsigned int mask;
183	int gatecfg;
184	struct priv_pcm3724 *priv;
185
186	gatecfg = 0;
187	priv = (struct priv_pcm3724 *) (dev->private);
188
189	mask = 1 << CR_CHAN(chanspec);
190	if (s == dev->subdevices) {	/*  subdev 0 */
191		priv->dio_1 |= mask;
192	} else {		/* subdev 1 */
193		priv->dio_2 |= mask;
194	}
195	if (priv->dio_1 & 0xff0000) {
196		gatecfg |= GATE_C0;
197	}
198	if (priv->dio_1 & 0xff00) {
199		gatecfg |= GATE_B0;
200	}
201	if (priv->dio_1 & 0xff) {
202		gatecfg |= GATE_A0;
203	}
204	if (priv->dio_2 & 0xff0000) {
205		gatecfg |= GATE_C1;
206	}
207	if (priv->dio_2 & 0xff00) {
208		gatecfg |= GATE_B1;
209	}
210	if (priv->dio_2 & 0xff) {
211		gatecfg |= GATE_A1;
212	}
213	/*       printk("gate control %x\n", gatecfg); */
214	outb(gatecfg, dev->iobase + 9);
215}
216
217/* overriding the 8255 insn config */
218static int subdev_3724_insn_config(struct comedi_device *dev, struct comedi_subdevice *s,
219	struct comedi_insn *insn, unsigned int *data)
220{
221	unsigned int mask;
222	unsigned int bits;
223
224	mask = 1 << CR_CHAN(insn->chanspec);
225	if (mask & 0x0000ff) {
226		bits = 0x0000ff;
227	} else if (mask & 0x00ff00) {
228		bits = 0x00ff00;
229	} else if (mask & 0x0f0000) {
230		bits = 0x0f0000;
231	} else {
232		bits = 0xf00000;
233	}
234
235	switch (data[0]) {
236	case INSN_CONFIG_DIO_INPUT:
237		s->io_bits &= ~bits;
238		break;
239	case INSN_CONFIG_DIO_OUTPUT:
240		s->io_bits |= bits;
241		break;
242	case INSN_CONFIG_DIO_QUERY:
243		data[1] = (s->io_bits & bits) ? COMEDI_OUTPUT : COMEDI_INPUT;
244		return insn->n;
245		break;
246	default:
247		return -EINVAL;
248	}
249
250	do_3724_config(dev, s, insn->chanspec);
251	enable_chan(dev, s, insn->chanspec);
252	return 1;
253}
254
255static int pcm3724_attach(struct comedi_device *dev, struct comedi_devconfig *it)
256{
257	unsigned long iobase;
258	unsigned int iorange;
259	int ret, i, n_subdevices;
260
261	iobase = it->options[0];
262	iorange = this_board->io_range;
263
264	ret = alloc_private(dev, sizeof(struct priv_pcm3724));
265	if (ret < 0)
266		return -ENOMEM;
267
268	((struct priv_pcm3724 *) (dev->private))->dio_1 = 0;
269	((struct priv_pcm3724 *) (dev->private))->dio_2 = 0;
270
271	printk("comedi%d: pcm3724: board=%s, 0x%03lx ", dev->minor,
272		this_board->name, iobase);
273	if (!iobase || !request_region(iobase, iorange, "pcm3724")) {
274		printk("I/O port conflict\n");
275		return -EIO;
276	}
277
278	dev->iobase = iobase;
279	dev->board_name = this_board->name;
280	printk("\n");
281
282	n_subdevices = this_board->numofports;
283
284	ret = alloc_subdevices(dev, n_subdevices);
285	if (ret < 0)
286		return ret;
287
288	for (i = 0; i < dev->n_subdevices; i++) {
289		subdev_8255_init(dev, dev->subdevices + i, subdev_8255_cb,
290			(unsigned long)(dev->iobase + SIZE_8255 * i));
291		((dev->subdevices) + i)->insn_config = subdev_3724_insn_config;
292	};
293	return 0;
294}
295
296static int pcm3724_detach(struct comedi_device *dev)
297{
298	int i;
299
300	if (dev->subdevices) {
301		for (i = 0; i < dev->n_subdevices; i++) {
302			subdev_8255_cleanup(dev, dev->subdevices + i);
303		}
304	}
305	if (dev->iobase) {
306		release_region(dev->iobase, this_board->io_range);
307	}
308
309	return 0;
310}
311