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
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD: releng/5.2/sys/i386/isa/spigot.c 118749 2003-08-10 23:04:55Z nectar $");
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 .d_open = spigot_open,
110 .d_close = spigot_close,
111 .d_read = spigot_read,
112 .d_write = spigot_write,
113 .d_ioctl = spigot_ioctl,
114 .d_mmap = spigot_mmap,
115 .d_name = "spigot",
116 .d_maj = CDEV_MAJOR,
117 };
118
119 static ointhand2_t spigintr;
120
121 static int
122 spigot_probe(struct isa_device *devp)
123 {
124 int status;
125 struct spigot_softc *ss=(struct spigot_softc *)&spigot_softc[devp->id_unit];
126
127 ss->flags = 0;
128 ss->maddr = 0;
129 ss->irq = 0;
130
131 if(devp->id_iobase != 0xad6 || inb(0xad9) == 0xff)
132 status = 0; /* not found */
133 else {
134 status = 1; /* found */
135 ss->flags |= ALIVE;
136 }
137
138 return(status);
139 }
140
141 static int
142 spigot_attach(struct isa_device *devp)
143 {
144 int unit;
145 struct spigot_softc *ss= &spigot_softc[unit = devp->id_unit];
146
147 devp->id_ointr = spigintr;
148 ss->maddr = kvtop(devp->id_maddr);
149 ss->irq = devp->id_irq;
150 make_dev(&spigot_cdevsw, unit, 0, 0, 0644, "spigot%d", unit);
151 return 1;
152 }
153
154 static int
155 spigot_open(dev_t dev, int flags, int fmt, struct thread *td)
156 {
157 int error;
158 struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
159
160 if((ss->flags & ALIVE) == 0)
161 return ENXIO;
162
163 if(ss->flags & OPEN)
164 return EBUSY;
165
166 #if !defined(SPIGOT_UNSECURE)
167 /*
168 * Don't allow open() unless the process has sufficient privileges,
169 * since mapping the i/o page and granting i/o privilege would
170 * require sufficient privilege soon and nothing much can be done
171 * without them.
172 */
173 error = suser(td);
174 if (error != 0)
175 return error;
176 error = securelevel_gt(td->td_ucred, 0);
177 if (error != 0)
178 return error;
179 #endif
180
181 ss->flags |= OPEN;
182 ss->p = 0;
183 ss->signal_num = 0;
184
185 return 0;
186 }
187
188 static int
189 spigot_close(dev_t dev, int flags, int fmt, struct thread *td)
190 {
191 struct 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
202 static int
203 spigot_write(dev_t dev, struct uio *uio, int ioflag)
204 {
205 return ENXIO;
206 }
207
208 static int
209 spigot_read(dev_t dev, struct uio *uio, int ioflag)
210 {
211 return ENXIO;
212 }
213
214
215 static int
216 spigot_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
217 {
218 int error;
219 struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
220 struct spigot_info *info;
221
222 if(!data) return(EINVAL);
223 switch(cmd){
224 case SPIGOT_SETINT:
225 if (*(int *)data < 0 || *(int *)data > _SIG_MAXSIG)
226 return EINVAL;
227 ss->p = td->td_proc;
228 ss->signal_num = *((int *)data);
229 break;
230 case SPIGOT_IOPL_ON: /* allow access to the IO PAGE */
231 #if !defined(SPIGOT_UNSECURE)
232 error = suser(td);
233 if (error != 0)
234 return error;
235 error = securelevel_gt(td->td_ucred, 0);
236 if (error)
237 return error;
238 #endif
239 td->td_frame->tf_eflags |= PSL_IOPL;
240 break;
241 case SPIGOT_IOPL_OFF: /* deny access to the IO PAGE */
242 td->td_frame->tf_eflags &= ~PSL_IOPL;
243 break;
244 case SPIGOT_GET_INFO:
245 info = (struct spigot_info *)data;
246 info->maddr = ss->maddr;
247 info->irq = ss->irq;
248 break;
249 default:
250 return ENOTTY;
251 }
252
253 return 0;
254 }
255
256 /*
257 * Interrupt procedure.
258 * Just call a user level interrupt routine.
259 */
260 static void
261 spigintr(int unit)
262 {
263 struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[unit];
264
265 if(ss->p && ss->signal_num) {
266 PROC_LOCK(ss->p);
267 psignal(ss->p, ss->signal_num);
268 PROC_UNLOCK(ss->p);
269 }
270 }
271
272 static int
273 spigot_mmap(dev_t dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
274 {
275 struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[0];
276
277 if(offset != 0) {
278 printf("spigot mmap failed, offset = 0x%x != 0x0\n", offset);
279 return -1;
280 }
281
282 if(nprot & PROT_EXEC)
283 return -1;
284
285 *paddr = ss->maddr;
286 return 0;
287 }
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