proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / dev / misc / spigot / spigot.c
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1/*
2 * Video spigot capture driver.
3 *
4 * Copyright (c) 1995, Jim Lowe. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer. 2.
10 * Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
18 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
21 * 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 * This is the minimum driver code required to make a spigot work.
27 * Unfortunatly, I can't include a real driver since the information
28 * on the spigot is under non-disclosure. You can pick up a library
29 * that will work with this driver from
30 * ftp://ftp.cs.uwm.edu/pub/FreeBSD-UWM. The library contains the
31 * source that I can release as well as several object modules and
32 * functions that allows one to read spigot data. See the code for
33 * spigot_grab.c that is included with the library data.
34 *
35 * The vendor will not allow me to release the spigot library code.
36 * Please don't ask me for it.
37 *
38 * To use this driver you will need the spigot library. The library is
39 * available from:
40 *
41 * ftp.cs.uwm.edu://pub/FreeBSD-UWM/spigot/spigot.tar.gz
42 *
43 * Version 1.7, December 1995.
44 *
45 * $FreeBSD: src/sys/i386/isa/spigot.c,v 1.44 2000/01/29 16:17:36 peter Exp $
dadab5e9 46 * $DragonFly: src/sys/dev/misc/spigot/spigot.c,v 1.3 2003/06/25 03:55:54 dillon Exp $
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47 *
48 */
49
50#include "spigot.h"
51
52#if NSPIGOT > 1
53error "Can only have 1 spigot configured."
54#endif
55
56#include "opt_spigot.h"
57
58#include <sys/param.h>
59#include <sys/systm.h>
60#include <sys/conf.h>
61#include <sys/proc.h>
62#include <sys/signalvar.h>
63#include <sys/mman.h>
64
65#include <machine/frame.h>
66#include <machine/md_var.h>
67#include <machine/spigot.h>
68#include <machine/psl.h>
69
70#include <i386/isa/isa_device.h>
71
72static struct spigot_softc {
73 u_long flags;
74 u_long maddr;
75 struct proc *p;
76 u_long signal_num;
77 u_short irq;
78} spigot_softc[NSPIGOT];
79
80/* flags in softc */
81#define OPEN 0x01
82#define ALIVE 0x02
83
84#define UNIT(dev) minor(dev)
85
86static int spigot_probe(struct isa_device *id);
87static int spigot_attach(struct isa_device *id);
88
89struct isa_driver spigotdriver = {spigot_probe, spigot_attach, "spigot"};
90
91static d_open_t spigot_open;
92static d_close_t spigot_close;
93static d_read_t spigot_read;
94static d_write_t spigot_write;
95static d_ioctl_t spigot_ioctl;
96static d_mmap_t spigot_mmap;
97
98#define CDEV_MAJOR 11
99static struct cdevsw spigot_cdevsw = {
100 /* open */ spigot_open,
101 /* close */ spigot_close,
102 /* read */ spigot_read,
103 /* write */ spigot_write,
104 /* ioctl */ spigot_ioctl,
105 /* poll */ nopoll,
106 /* mmap */ spigot_mmap,
107 /* strategy */ nostrategy,
108 /* name */ "spigot",
109 /* maj */ CDEV_MAJOR,
110 /* dump */ nodump,
111 /* psize */ nopsize,
112 /* flags */ 0,
113 /* bmaj */ -1
114};
115
116static ointhand2_t spigintr;
117
118static int
119spigot_probe(struct isa_device *devp)
120{
121int status;
122struct spigot_softc *ss=(struct spigot_softc *)&spigot_softc[devp->id_unit];
123static int once;
124
125 if (!once++)
126 cdevsw_add(&spigot_cdevsw);
127
128 ss->flags = 0;
129 ss->maddr = 0;
130 ss->irq = 0;
131
132 if(devp->id_iobase != 0xad6 || inb(0xad9) == 0xff)
133 status = 0; /* not found */
134 else {
135 status = 1; /* found */
136 ss->flags |= ALIVE;
137 }
138
139 return(status);
140}
141
142static int
143spigot_attach(struct isa_device *devp)
144{
145 int unit;
146 struct spigot_softc *ss= &spigot_softc[unit = devp->id_unit];
147
148 devp->id_ointr = spigintr;
149 ss->maddr = kvtop(devp->id_maddr);
150 ss->irq = devp->id_irq;
151 make_dev(&spigot_cdevsw, unit, 0, 0, 0644, "spigot%d", unit);
152 return 1;
153}
154
155static int
156spigot_open(dev_t dev, int flags, int fmt, struct proc *p)
157{
158int error;
159struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
160
161 if((ss->flags & ALIVE) == 0)
162 return ENXIO;
163
164 if(ss->flags & OPEN)
165 return EBUSY;
166
167#if !defined(SPIGOT_UNSECURE)
168 /*
169 * Don't allow open() unless the process has sufficient privileges,
170 * since mapping the i/o page and granting i/o privilege would
171 * require sufficient privilege soon and nothing much can be done
172 * without them.
173 */
dadab5e9 174 error = suser(td);
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175 if (error != 0)
176 return error;
177 if (securelevel > 0)
178 return EPERM;
179#endif
180
181 ss->flags |= OPEN;
182 ss->p = 0;
183 ss->signal_num = 0;
184
185 return 0;
186}
187
188static int
189spigot_close(dev_t dev, int flags, int fmt, struct proc *p)
190{
191struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
192
193 ss->flags &= ~OPEN;
194 ss->p = 0;
195 ss->signal_num = 0;
196
197 outb(0xad6, 0);
198
199 return 0;
200}
201
202static int
203spigot_write(dev_t dev, struct uio *uio, int ioflag)
204{
205 return ENXIO;
206}
207
208static int
209spigot_read(dev_t dev, struct uio *uio, int ioflag)
210{
211 return ENXIO;
212}
213
214
215static int
216spigot_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
217{
218int error;
219struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
220struct spigot_info *info;
221
222 if(!data) return(EINVAL);
223 switch(cmd){
224 case SPIGOT_SETINT:
225 ss->p = p;
226 ss->signal_num = *((int *)data);
227 break;
228 case SPIGOT_IOPL_ON: /* allow access to the IO PAGE */
229#if !defined(SPIGOT_UNSECURE)
dadab5e9 230 error = suser(td);
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231 if (error != 0)
232 return error;
233 if (securelevel > 0)
234 return EPERM;
235#endif
236 p->p_md.md_regs->tf_eflags |= PSL_IOPL;
237 break;
238 case SPIGOT_IOPL_OFF: /* deny access to the IO PAGE */
239 p->p_md.md_regs->tf_eflags &= ~PSL_IOPL;
240 break;
241 case SPIGOT_GET_INFO:
242 info = (struct spigot_info *)data;
243 info->maddr = ss->maddr;
244 info->irq = ss->irq;
245 break;
246 default:
247 return ENOTTY;
248 }
249
250 return 0;
251}
252
253/*
254 * Interrupt procedure.
255 * Just call a user level interrupt routine.
256 */
257static void
258spigintr(int unit)
259{
260struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[unit];
261
262 if(ss->p && ss->signal_num)
263 psignal(ss->p, ss->signal_num);
264}
265
266static int
267spigot_mmap(dev_t dev, vm_offset_t offset, int nprot)
268{
269struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[0];
270
271 if(offset != 0) {
272 printf("spigot mmap failed, offset = 0x%x != 0x0\n", offset);
273 return -1;
274 }
275
276 if(nprot & PROT_EXEC)
277 return -1;
278
279 return i386_btop(ss->maddr);
280}