Additional note to last commit. GCC-3.4 improperly generates a warning
[dragonfly.git] / sys / bus / iicbus / iic.c
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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 $
5e2195bf 27 * $DragonFly: src/sys/bus/iicbus/iic.c,v 1.8 2005/02/17 13:59:35 joerg 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
96static struct cdevsw iic_cdevsw = {
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97 /* name */ "iic",
98 /* maj */ CDEV_MAJOR,
99 /* flags */ 0,
100 /* port */ NULL,
455fcd7e 101 /* clone */ NULL,
fabb8ceb 102
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103 /* open */ iicopen,
104 /* close */ iicclose,
105 /* read */ iicread,
106 /* write */ iicwrite,
107 /* ioctl */ iicioctl,
108 /* poll */ nopoll,
109 /* mmap */ nommap,
110 /* strategy */ nostrategy,
984263bc 111 /* dump */ nodump,
fabb8ceb 112 /* psize */ nopsize
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113};
114
115/*
116 * iicprobe()
117 */
118static int
119iic_probe(device_t dev)
120{
121 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
122
123 sc->sc_addr = iicbus_get_addr(dev);
124
125 /* XXX detect chip with start/stop conditions */
126
127 return (0);
128}
129
130/*
131 * iicattach()
132 */
133static int
134iic_attach(device_t dev)
135{
e4c9c0c8 136 cdevsw_add(&iic_cdevsw, -1, device_get_unit(dev));
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137 make_dev(&iic_cdevsw, device_get_unit(dev), /* XXX cleanup */
138 UID_ROOT, GID_WHEEL,
139 0600, "iic%d", device_get_unit(dev));
140 return (0);
141}
142
143static int
7b95be2a 144iicopen (dev_t dev, int flags, int fmt, struct thread *td)
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145{
146 struct iic_softc *sc = IIC_SOFTC(minor(dev));
147
148 if (!sc)
149 return (EINVAL);
150
151 if (sc->sc_count > 0)
152 return (EBUSY);
153
154 sc->sc_count++;
155
156 return (0);
157}
158
159static int
7b95be2a 160iicclose(dev_t dev, int flags, int fmt, struct thread *td)
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161{
162 struct iic_softc *sc = IIC_SOFTC(minor(dev));
163
164 if (!sc)
165 return (EINVAL);
166
167 if (!sc->sc_count)
168 return (EINVAL);
169
170 sc->sc_count--;
171
172 if (sc->sc_count < 0)
5e2195bf 173 panic("%s: iic_count < 0!", __func__);
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174
175 return (0);
176}
177
178static int
179iicwrite(dev_t dev, struct uio * uio, int ioflag)
180{
181 device_t iicdev = IIC_DEVICE(minor(dev));
182 struct iic_softc *sc = IIC_SOFTC(minor(dev));
183 int sent, error, count;
184
185 if (!sc || !iicdev)
186 return (EINVAL);
187
188 if (sc->sc_count == 0)
189 return (EINVAL);
190
191 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
192 return (error);
193
194 count = min(uio->uio_resid, BUFSIZE);
195 uiomove(sc->sc_buffer, count, uio);
196
197 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
198 sc->sc_buffer, count, &sent);
199
200 iicbus_release_bus(device_get_parent(iicdev), iicdev);
201
202 return(error);
203}
204
205static int
206iicread(dev_t dev, struct uio * uio, int ioflag)
207{
208 device_t iicdev = IIC_DEVICE(minor(dev));
209 struct iic_softc *sc = IIC_SOFTC(minor(dev));
210 int len, error = 0;
211 int bufsize;
212
213 if (!sc || !iicdev)
214 return (EINVAL);
215
216 if (sc->sc_count == 0)
217 return (EINVAL);
218
219 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
220 return (error);
221
222 /* max amount of data to read */
223 len = min(uio->uio_resid, BUFSIZE);
224
225 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
226 sc->sc_inbuf, len, &bufsize)))
227 return (error);
228
229 if (bufsize > uio->uio_resid)
5e2195bf 230 panic("%s: too much data read!", __func__);
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231
232 iicbus_release_bus(device_get_parent(iicdev), iicdev);
233
234 return (uiomove(sc->sc_inbuf, bufsize, uio));
235}
236
237static int
7b95be2a 238iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td)
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239{
240 device_t iicdev = IIC_DEVICE(minor(dev));
241 struct iic_softc *sc = IIC_SOFTC(minor(dev));
242 device_t parent = device_get_parent(iicdev);
243 struct iiccmd *s = (struct iiccmd *)data;
244 int error, count;
245
246 if (!sc)
247 return (EINVAL);
248
249 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
250 (flags & O_NONBLOCK) ? IIC_DONTWAIT :
251 (IIC_WAIT | IIC_INTR))))
252 return (error);
253
254 switch (cmd) {
255 case I2CSTART:
256 error = iicbus_start(parent, s->slave, 0);
257 break;
258
259 case I2CSTOP:
260 error = iicbus_stop(parent);
261 break;
262
263 case I2CRSTCARD:
264 error = iicbus_reset(parent, 0, 0, NULL);
265 break;
266
267 case I2CWRITE:
268 error = iicbus_write(parent, s->buf, s->count, &count, 0);
269 break;
270
271 case I2CREAD:
272 error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0);
273 break;
274
275 default:
276 error = ENODEV;
277 }
278
279 iicbus_release_bus(device_get_parent(iicdev), iicdev);
280
281 return (error);
282}
283
284DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);