FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/spigot.c
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: releng/5.0/sys/i386/isa/spigot.c 118752 2003-08-10 23:17:49Z nectar $
46 *
47 */
48
49 #include "spigot.h"
50
51 #if NSPIGOT > 1
52 error "Can only have 1 spigot configured."
53 #endif
54
55 #include "opt_spigot.h"
56
57 #include <sys/param.h>
58 #include <sys/systm.h>
59 #include <sys/bus.h>
60 #include <sys/conf.h>
61 #include <sys/kernel.h>
62 #include <sys/lock.h>
63 #include <sys/mman.h>
64 #include <sys/mutex.h>
65 #include <sys/proc.h>
66 #include <sys/signalvar.h>
67
68 #include <machine/frame.h>
69 #include <machine/md_var.h>
70 #include <machine/spigot.h>
71 #include <machine/psl.h>
72
73 #include <i386/isa/isa_device.h>
74
75 static struct spigot_softc {
76 u_long flags;
77 u_long maddr;
78 struct proc *p;
79 u_long signal_num;
80 u_short irq;
81 } spigot_softc[NSPIGOT];
82
83 /* flags in softc */
84 #define OPEN 0x01
85 #define ALIVE 0x02
86
87 #define UNIT(dev) minor(dev)
88
89 static int spigot_probe(struct isa_device *id);
90 static int spigot_attach(struct isa_device *id);
91
92 struct isa_driver spigotdriver = {
93 INTR_TYPE_MISC,
94 spigot_probe,
95 spigot_attach,
96 "spigot"
97 };
98 COMPAT_ISA_DRIVER(spigot, spigotdriver);
99
100 static d_open_t spigot_open;
101 static d_close_t spigot_close;
102 static d_read_t spigot_read;
103 static d_write_t spigot_write;
104 static d_ioctl_t spigot_ioctl;
105 static d_mmap_t spigot_mmap;
106
107 #define CDEV_MAJOR 11
108 static struct cdevsw spigot_cdevsw = {
109 /* open */ spigot_open,
110 /* close */ spigot_close,
111 /* read */ spigot_read,
112 /* write */ spigot_write,
113 /* ioctl */ spigot_ioctl,
114 /* poll */ nopoll,
115 /* mmap */ spigot_mmap,
116 /* strategy */ nostrategy,
117 /* name */ "spigot",
118 /* maj */ CDEV_MAJOR,
119 /* dump */ nodump,
120 /* psize */ nopsize,
121 /* flags */ 0,
122 };
123
124 static ointhand2_t spigintr;
125
126 static int
127 spigot_probe(struct isa_device *devp)
128 {
129 int status;
130 struct spigot_softc *ss=(struct spigot_softc *)&spigot_softc[devp->id_unit];
131
132 ss->flags = 0;
133 ss->maddr = 0;
134 ss->irq = 0;
135
136 if(devp->id_iobase != 0xad6 || inb(0xad9) == 0xff)
137 status = 0; /* not found */
138 else {
139 status = 1; /* found */
140 ss->flags |= ALIVE;
141 }
142
143 return(status);
144 }
145
146 static int
147 spigot_attach(struct isa_device *devp)
148 {
149 int unit;
150 struct spigot_softc *ss= &spigot_softc[unit = devp->id_unit];
151
152 devp->id_ointr = spigintr;
153 ss->maddr = kvtop(devp->id_maddr);
154 ss->irq = devp->id_irq;
155 make_dev(&spigot_cdevsw, unit, 0, 0, 0644, "spigot%d", unit);
156 return 1;
157 }
158
159 static int
160 spigot_open(dev_t dev, int flags, int fmt, struct thread *td)
161 {
162 int error;
163 struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
164
165 if((ss->flags & ALIVE) == 0)
166 return ENXIO;
167
168 if(ss->flags & OPEN)
169 return EBUSY;
170
171 #if !defined(SPIGOT_UNSECURE)
172 /*
173 * Don't allow open() unless the process has sufficient privileges,
174 * since mapping the i/o page and granting i/o privilege would
175 * require sufficient privilege soon and nothing much can be done
176 * without them.
177 */
178 error = suser(td);
179 if (error != 0)
180 return error;
181 error = securelevel_gt(td->td_ucred, 0);
182 if (error != 0)
183 return error;
184 #endif
185
186 ss->flags |= OPEN;
187 ss->p = 0;
188 ss->signal_num = 0;
189
190 return 0;
191 }
192
193 static int
194 spigot_close(dev_t dev, int flags, int fmt, struct thread *td)
195 {
196 struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
197
198 ss->flags &= ~OPEN;
199 ss->p = 0;
200 ss->signal_num = 0;
201
202 outb(0xad6, 0);
203
204 return 0;
205 }
206
207 static int
208 spigot_write(dev_t dev, struct uio *uio, int ioflag)
209 {
210 return ENXIO;
211 }
212
213 static int
214 spigot_read(dev_t dev, struct uio *uio, int ioflag)
215 {
216 return ENXIO;
217 }
218
219
220 static int
221 spigot_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
222 {
223 int error;
224 struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
225 struct spigot_info *info;
226
227 if(!data) return(EINVAL);
228 switch(cmd){
229 case SPIGOT_SETINT:
230 if (*(int *)data < 0 || *(int *)data > _SIG_MAXSIG)
231 return EINVAL;
232 ss->p = td->td_proc;
233 ss->signal_num = *((int *)data);
234 break;
235 case SPIGOT_IOPL_ON: /* allow access to the IO PAGE */
236 #if !defined(SPIGOT_UNSECURE)
237 error = suser(td);
238 if (error != 0)
239 return error;
240 error = securelevel_gt(td->td_ucred, 0);
241 if (error)
242 return error;
243 #endif
244 td->td_frame->tf_eflags |= PSL_IOPL;
245 break;
246 case SPIGOT_IOPL_OFF: /* deny access to the IO PAGE */
247 td->td_frame->tf_eflags &= ~PSL_IOPL;
248 break;
249 case SPIGOT_GET_INFO:
250 info = (struct spigot_info *)data;
251 info->maddr = ss->maddr;
252 info->irq = ss->irq;
253 break;
254 default:
255 return ENOTTY;
256 }
257
258 return 0;
259 }
260
261 /*
262 * Interrupt procedure.
263 * Just call a user level interrupt routine.
264 */
265 static void
266 spigintr(int unit)
267 {
268 struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[unit];
269
270 if(ss->p && ss->signal_num) {
271 PROC_LOCK(ss->p);
272 psignal(ss->p, ss->signal_num);
273 PROC_UNLOCK(ss->p);
274 }
275 }
276
277 static int
278 spigot_mmap(dev_t dev, vm_offset_t offset, int nprot)
279 {
280 struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[0];
281
282 if(offset != 0) {
283 printf("spigot mmap failed, offset = 0x%x != 0x0\n", offset);
284 return -1;
285 }
286
287 if(nprot & PROT_EXEC)
288 return -1;
289
290 return i386_btop(ss->maddr);
291 }
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