Change the kernel dev_t, representing a pointer to a specinfo structure,
[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 $
b13267a5 46 * $DragonFly: src/sys/dev/misc/spigot/spigot.c,v 1.14 2006/09/10 01:26:35 dillon Exp $
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47 *
48 */
49
1f2de5d4 50#include "use_spigot.h"
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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>
fef8985e 61#include <sys/device.h>
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62#include <sys/proc.h>
63#include <sys/signalvar.h>
64#include <sys/mman.h>
65
66#include <machine/frame.h>
67#include <machine/md_var.h>
68#include <machine/spigot.h>
69#include <machine/psl.h>
70
1f2de5d4 71#include <bus/isa/i386/isa_device.h>
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72
73static struct spigot_softc {
74 u_long flags;
75 u_long maddr;
76 struct proc *p;
77 u_long signal_num;
78 u_short irq;
79} spigot_softc[NSPIGOT];
80
81/* flags in softc */
82#define OPEN 0x01
83#define ALIVE 0x02
84
85#define UNIT(dev) minor(dev)
86
87static int spigot_probe(struct isa_device *id);
88static int spigot_attach(struct isa_device *id);
89
90struct isa_driver spigotdriver = {spigot_probe, spigot_attach, "spigot"};
91
92static d_open_t spigot_open;
93static d_close_t spigot_close;
94static d_read_t spigot_read;
95static d_write_t spigot_write;
96static d_ioctl_t spigot_ioctl;
97static d_mmap_t spigot_mmap;
98
99#define CDEV_MAJOR 11
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100static struct dev_ops spigot_ops = {
101 { "spigot", CDEV_MAJOR, 0 },
102 .d_open = spigot_open,
103 .d_close = spigot_close,
104 .d_read = spigot_read,
105 .d_write = spigot_write,
106 .d_ioctl = spigot_ioctl,
107 .d_mmap = spigot_mmap,
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108};
109
1b51b0fa 110static void spigintr(void *);
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111
112static int
113spigot_probe(struct isa_device *devp)
114{
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115 struct spigot_softc *ss;
116 int status;
984263bc 117
e4c9c0c8 118 ss = (struct spigot_softc *)&spigot_softc[devp->id_unit];
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119 ss->flags = 0;
120 ss->maddr = 0;
121 ss->irq = 0;
122
123 if(devp->id_iobase != 0xad6 || inb(0xad9) == 0xff)
124 status = 0; /* not found */
125 else {
126 status = 1; /* found */
127 ss->flags |= ALIVE;
128 }
129
130 return(status);
131}
132
133static int
134spigot_attach(struct isa_device *devp)
135{
136 int unit;
137 struct spigot_softc *ss= &spigot_softc[unit = devp->id_unit];
138
1b51b0fa 139 devp->id_intr = (inthand2_t *)spigintr;
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140 ss->maddr = kvtop(devp->id_maddr);
141 ss->irq = devp->id_irq;
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142 dev_ops_add(&spigot_ops, -1, unit);
143 make_dev(&spigot_ops, unit, 0, 0, 0644, "spigot%d", unit);
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144 return 1;
145}
146
147static int
fef8985e 148spigot_open(struct dev_open_args *ap)
984263bc 149{
b13267a5 150 cdev_t dev = ap->a_head.a_dev;
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151 int error;
152 struct spigot_softc *ss;
153
154 ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
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155
156 if((ss->flags & ALIVE) == 0)
157 return ENXIO;
158
159 if(ss->flags & OPEN)
160 return EBUSY;
161
162#if !defined(SPIGOT_UNSECURE)
163 /*
164 * Don't allow open() unless the process has sufficient privileges,
165 * since mapping the i/o page and granting i/o privilege would
166 * require sufficient privilege soon and nothing much can be done
167 * without them.
168 */
fef8985e 169 error = suser_cred(ap->a_cred, 0);
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170 if (error != 0)
171 return error;
172 if (securelevel > 0)
173 return EPERM;
174#endif
175
176 ss->flags |= OPEN;
177 ss->p = 0;
178 ss->signal_num = 0;
179
180 return 0;
181}
182
183static int
fef8985e 184spigot_close(struct dev_close_args *ap)
984263bc 185{
b13267a5 186 cdev_t dev = ap->a_head.a_dev;
fef8985e 187 struct spigot_softc *ss;
984263bc 188
fef8985e 189 ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
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190 ss->flags &= ~OPEN;
191 ss->p = 0;
192 ss->signal_num = 0;
193
194 outb(0xad6, 0);
195
196 return 0;
197}
198
199static int
fef8985e 200spigot_write(struct dev_write_args *ap)
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201{
202 return ENXIO;
203}
204
205static int
fef8985e 206spigot_read(struct dev_read_args *ap)
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207{
208 return ENXIO;
209}
210
211
212static int
fef8985e 213spigot_ioctl(struct dev_ioctl_args *ap)
984263bc 214{
b13267a5 215 cdev_t dev = ap->a_head.a_dev;
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216 caddr_t data = ap->a_data;
217 int error;
218 struct spigot_softc *ss;
219 struct spigot_info *info;
220
221 ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
222 if (data == NULL)
223 return(EINVAL);
984263bc 224
fef8985e 225 switch(ap->a_cmd){
984263bc 226 case SPIGOT_SETINT:
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227 if (*(int *)data < 0 || *(int *)data > _SIG_MAXSIG)
228 return (EINVAL);
fef8985e 229 ss->p = curproc;
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230 ss->signal_num = *((int *)data);
231 break;
232 case SPIGOT_IOPL_ON: /* allow access to the IO PAGE */
233#if !defined(SPIGOT_UNSECURE)
fef8985e 234 error = suser_cred(ap->a_cred, 0);
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235 if (error != 0)
236 return error;
237 if (securelevel > 0)
238 return EPERM;
239#endif
fef8985e 240 curproc->p_md.md_regs->tf_eflags |= PSL_IOPL;
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241 break;
242 case SPIGOT_IOPL_OFF: /* deny access to the IO PAGE */
fef8985e 243 curproc->p_md.md_regs->tf_eflags &= ~PSL_IOPL;
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244 break;
245 case SPIGOT_GET_INFO:
246 info = (struct spigot_info *)data;
247 info->maddr = ss->maddr;
248 info->irq = ss->irq;
249 break;
250 default:
251 return ENOTTY;
252 }
253
254 return 0;
255}
256
257/*
258 * Interrupt procedure.
259 * Just call a user level interrupt routine.
260 */
261static void
477d3c1c 262spigintr(void *arg)
984263bc 263{
477d3c1c 264 int unit = (int)arg;
fef8985e 265 struct spigot_softc *ss;
984263bc 266
fef8985e 267 ss = (struct spigot_softc *)&spigot_softc[unit];
984263bc 268 if(ss->p && ss->signal_num)
84204577 269 ksignal(ss->p, ss->signal_num);
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270}
271
272static int
fef8985e 273spigot_mmap(struct dev_mmap_args *ap)
984263bc 274{
fef8985e 275 struct spigot_softc *ss;
984263bc 276
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277 ss = (struct spigot_softc *)&spigot_softc[0];
278 if (ap->a_offset != 0)
279 return EINVAL;
280 if (ap->a_nprot & PROT_EXEC)
281 return EINVAL;
282 ap->a_result = i386_btop(ss->maddr);
283 return(0);
984263bc 284}