Change the kernel dev_t, representing a pointer to a specinfo structure,
[dragonfly.git] / sys / bus / iicbus / iic.c
CommitLineData
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1/*-
2 * Copyright (c) 1998 Nicolas Souchu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/dev/iicbus/iic.c,v 1.18 1999/11/18 05:43:32 peter Exp $
b13267a5 27 * $DragonFly: src/sys/bus/iicbus/iic.c,v 1.10 2006/09/10 01:26:32 dillon Exp $
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28 *
29 */
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33#include <sys/module.h>
34#include <sys/bus.h>
35#include <sys/conf.h>
36#include <sys/buf.h>
37#include <sys/uio.h>
38#include <sys/malloc.h>
39#include <sys/fcntl.h>
40
41#include <machine/clock.h>
42
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43#include "iiconf.h"
44#include "iicbus.h"
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45
46#include <machine/iic.h>
47
48#include "iicbus_if.h"
49
50#define BUFSIZE 1024
51
52struct iic_softc {
53
54 u_char sc_addr; /* address on iicbus */
55 int sc_count; /* >0 if device opened */
56
57 char sc_buffer[BUFSIZE]; /* output buffer */
58 char sc_inbuf[BUFSIZE]; /* input buffer */
59};
60
61#define IIC_SOFTC(unit) \
62 ((struct iic_softc *)devclass_get_softc(iic_devclass, (unit)))
63
64#define IIC_DEVICE(unit) \
65 (devclass_get_device(iic_devclass, (unit)))
66
67static int iic_probe(device_t);
68static int iic_attach(device_t);
69
70static devclass_t iic_devclass;
71
72static device_method_t iic_methods[] = {
73 /* device interface */
74 DEVMETHOD(device_probe, iic_probe),
75 DEVMETHOD(device_attach, iic_attach),
76
77 /* iicbus interface */
78 DEVMETHOD(iicbus_intr, iicbus_generic_intr),
79
80 { 0, 0 }
81};
82
83static driver_t iic_driver = {
84 "iic",
85 iic_methods,
86 sizeof(struct iic_softc),
87};
88
89static d_open_t iicopen;
90static d_close_t iicclose;
91static d_write_t iicwrite;
92static d_read_t iicread;
93static d_ioctl_t iicioctl;
94
95#define CDEV_MAJOR 105
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96static struct dev_ops iic_ops = {
97 { "iic", CDEV_MAJOR, 0 },
98 .d_open = iicopen,
99 .d_close = iicclose,
100 .d_read = iicread,
101 .d_write = iicwrite,
102 .d_ioctl = iicioctl,
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103};
104
105/*
106 * iicprobe()
107 */
108static int
109iic_probe(device_t dev)
110{
111 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
112
113 sc->sc_addr = iicbus_get_addr(dev);
114
115 /* XXX detect chip with start/stop conditions */
116
117 return (0);
118}
119
120/*
121 * iicattach()
122 */
123static int
124iic_attach(device_t dev)
125{
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126 dev_ops_add(&iic_ops, -1, device_get_unit(dev));
127 make_dev(&iic_ops, device_get_unit(dev), /* XXX cleanup */
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128 UID_ROOT, GID_WHEEL,
129 0600, "iic%d", device_get_unit(dev));
130 return (0);
131}
132
133static int
fef8985e 134iicopen (struct dev_open_args *ap)
984263bc 135{
b13267a5 136 cdev_t dev = ap->a_head.a_dev;
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137 struct iic_softc *sc = IIC_SOFTC(minor(dev));
138
139 if (!sc)
140 return (EINVAL);
141
142 if (sc->sc_count > 0)
143 return (EBUSY);
144
145 sc->sc_count++;
146
147 return (0);
148}
149
150static int
fef8985e 151iicclose(struct dev_close_args *ap)
984263bc 152{
b13267a5 153 cdev_t dev = ap->a_head.a_dev;
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154 struct iic_softc *sc = IIC_SOFTC(minor(dev));
155
156 if (!sc)
157 return (EINVAL);
158
159 if (!sc->sc_count)
160 return (EINVAL);
161
162 sc->sc_count--;
163
164 if (sc->sc_count < 0)
5e2195bf 165 panic("%s: iic_count < 0!", __func__);
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166
167 return (0);
168}
169
170static int
fef8985e 171iicwrite(struct dev_write_args *ap)
984263bc 172{
b13267a5 173 cdev_t dev = ap->a_head.a_dev;
fef8985e 174 struct uio *uio = ap->a_uio;
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175 device_t iicdev = IIC_DEVICE(minor(dev));
176 struct iic_softc *sc = IIC_SOFTC(minor(dev));
177 int sent, error, count;
178
179 if (!sc || !iicdev)
180 return (EINVAL);
181
182 if (sc->sc_count == 0)
183 return (EINVAL);
184
185 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
186 return (error);
187
188 count = min(uio->uio_resid, BUFSIZE);
189 uiomove(sc->sc_buffer, count, uio);
190
191 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
192 sc->sc_buffer, count, &sent);
193
194 iicbus_release_bus(device_get_parent(iicdev), iicdev);
195
196 return(error);
197}
198
199static int
fef8985e 200iicread(struct dev_read_args *ap)
984263bc 201{
b13267a5 202 cdev_t dev = ap->a_head.a_dev;
fef8985e 203 struct uio *uio = ap->a_uio;
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204 device_t iicdev = IIC_DEVICE(minor(dev));
205 struct iic_softc *sc = IIC_SOFTC(minor(dev));
206 int len, error = 0;
207 int bufsize;
208
209 if (!sc || !iicdev)
210 return (EINVAL);
211
212 if (sc->sc_count == 0)
213 return (EINVAL);
214
215 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
216 return (error);
217
218 /* max amount of data to read */
219 len = min(uio->uio_resid, BUFSIZE);
220
221 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
222 sc->sc_inbuf, len, &bufsize)))
223 return (error);
224
225 if (bufsize > uio->uio_resid)
5e2195bf 226 panic("%s: too much data read!", __func__);
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227
228 iicbus_release_bus(device_get_parent(iicdev), iicdev);
229
230 return (uiomove(sc->sc_inbuf, bufsize, uio));
231}
232
233static int
fef8985e 234iicioctl(struct dev_ioctl_args *ap)
984263bc 235{
b13267a5 236 cdev_t dev = ap->a_head.a_dev;
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237 device_t iicdev = IIC_DEVICE(minor(dev));
238 struct iic_softc *sc = IIC_SOFTC(minor(dev));
239 device_t parent = device_get_parent(iicdev);
fef8985e 240 struct iiccmd *s = (struct iiccmd *)ap->a_data;
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241 int error, count;
242
243 if (!sc)
244 return (EINVAL);
245
246 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
fef8985e 247 (ap->a_fflag & O_NONBLOCK) ? IIC_DONTWAIT :
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248 (IIC_WAIT | IIC_INTR))))
249 return (error);
250
fef8985e 251 switch (ap->a_cmd) {
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252 case I2CSTART:
253 error = iicbus_start(parent, s->slave, 0);
254 break;
255
256 case I2CSTOP:
257 error = iicbus_stop(parent);
258 break;
259
260 case I2CRSTCARD:
261 error = iicbus_reset(parent, 0, 0, NULL);
262 break;
263
264 case I2CWRITE:
265 error = iicbus_write(parent, s->buf, s->count, &count, 0);
266 break;
267
268 case I2CREAD:
269 error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0);
270 break;
271
272 default:
273 error = ENODEV;
274 }
275
276 iicbus_release_bus(device_get_parent(iicdev), iicdev);
277
278 return (error);
279}
280
281DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);