1 /* $NetBSD: cir.c,v 1.33 2022/03/31 19:30:16 pgoyette Exp $ */
2
3 /*
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Lennart Augustsson (lennart@augustsson.net).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: cir.c,v 1.33 2022/03/31 19:30:16 pgoyette Exp $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/ioctl.h>
38 #include <sys/kernel.h>
39 #include <sys/device.h>
40 #include <sys/conf.h>
41 #include <sys/poll.h>
42 #include <sys/select.h>
43 #include <sys/vnode.h>
44 #include <sys/module.h>
45
46 #include <dev/ir/ir.h>
47 #include <dev/ir/cirio.h>
48 #include <dev/ir/cirvar.h>
49
50 dev_type_open(ciropen);
51 dev_type_close(circlose);
52 dev_type_read(cirread);
53 dev_type_write(cirwrite);
54 dev_type_ioctl(cirioctl);
55 dev_type_poll(cirpoll);
56
57 const struct cdevsw cir_cdevsw = {
58 .d_open = ciropen,
59 .d_close = circlose,
60 .d_read = cirread,
61 .d_write = cirwrite,
62 .d_ioctl = cirioctl,
63 .d_stop = nostop,
64 .d_tty = notty,
65 .d_poll = cirpoll,
66 .d_mmap = nommap,
67 .d_kqfilter = nokqfilter,
68 .d_discard = nodiscard,
69 .d_flag = D_OTHER
70 };
71
72 int cir_match(device_t parent, cfdata_t match, void *aux);
73 void cir_attach(device_t parent, device_t self, void *aux);
74 int cir_detach(device_t self, int flags);
75
76 CFATTACH_DECL_NEW(cir, sizeof(struct cir_softc),
77 cir_match, cir_attach, cir_detach, NULL);
78
79 extern struct cfdriver cir_cd;
80
81 #define CIRUNIT(dev) (minor(dev))
82
83 int
cir_match(device_t parent,cfdata_t match,void * aux)84 cir_match(device_t parent, cfdata_t match, void *aux)
85 {
86 struct ir_attach_args *ia = aux;
87
88 return (ia->ia_type == IR_TYPE_CIR);
89 }
90
91 void
cir_attach(device_t parent,device_t self,void * aux)92 cir_attach(device_t parent, device_t self, void *aux)
93 {
94 struct cir_softc *sc = device_private(self);
95 struct ir_attach_args *ia = aux;
96
97 sc->sc_dev = self;
98
99 selinit(&sc->sc_rdsel);
100 sc->sc_methods = ia->ia_methods;
101 sc->sc_handle = ia->ia_handle;
102
103 #ifdef DIAGNOSTIC
104 if (sc->sc_methods->im_read == NULL ||
105 sc->sc_methods->im_write == NULL ||
106 sc->sc_methods->im_setparams == NULL)
107 panic("%s: missing methods", device_xname(sc->sc_dev));
108 #endif
109 aprint_naive("\n");
110 aprint_normal("\n");
111 }
112
113 int
cir_detach(device_t self,int flags)114 cir_detach(device_t self, int flags)
115 {
116 struct cir_softc *sc = device_private(self);
117 int maj, mn;
118
119 /* locate the major number */
120 maj = cdevsw_lookup_major(&cir_cdevsw);
121
122 /* Nuke the vnodes for any open instances (calls close). */
123 mn = device_unit(self);
124 vdevgone(maj, mn, mn, VCHR);
125
126 seldestroy(&sc->sc_rdsel);
127
128 return (0);
129 }
130
131 int
ciropen(dev_t dev,int flag,int mode,struct lwp * l)132 ciropen(dev_t dev, int flag, int mode, struct lwp *l)
133 {
134 struct cir_softc *sc;
135 int error;
136
137 sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
138 if (sc == NULL)
139 return (ENXIO);
140 if (!device_is_active(sc->sc_dev))
141 return (EIO);
142 if (sc->sc_open)
143 return (EBUSY);
144
145 sc->sc_rdframes = 0;
146 if (sc->sc_methods->im_open != NULL) {
147 error = sc->sc_methods->im_open(sc->sc_handle, flag, mode,
148 l->l_proc);
149 if (error)
150 return (error);
151 }
152 sc->sc_open = 1;
153 return (0);
154 }
155
156 int
circlose(dev_t dev,int flag,int mode,struct lwp * l)157 circlose(dev_t dev, int flag, int mode, struct lwp *l)
158 {
159 struct cir_softc *sc;
160 int error;
161
162 sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
163 if (sc == NULL)
164 return (ENXIO);
165 if (sc->sc_methods->im_close != NULL)
166 error = sc->sc_methods->im_close(sc->sc_handle, flag, mode,
167 l->l_proc);
168 else
169 error = 0;
170 sc->sc_open = 0;
171 return (error);
172 }
173
174 int
cirread(dev_t dev,struct uio * uio,int flag)175 cirread(dev_t dev, struct uio *uio, int flag)
176 {
177 struct cir_softc *sc;
178
179 sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
180 if (sc == NULL)
181 return (ENXIO);
182 if (!device_is_active(sc->sc_dev))
183 return (EIO);
184 return (sc->sc_methods->im_read(sc->sc_handle, uio, flag));
185 }
186
187 int
cirwrite(dev_t dev,struct uio * uio,int flag)188 cirwrite(dev_t dev, struct uio *uio, int flag)
189 {
190 struct cir_softc *sc;
191
192 sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
193 if (sc == NULL)
194 return (ENXIO);
195 if (!device_is_active(sc->sc_dev))
196 return (EIO);
197 return (sc->sc_methods->im_write(sc->sc_handle, uio, flag));
198 }
199
200 int
cirioctl(dev_t dev,u_long cmd,void * addr,int flag,struct lwp * l)201 cirioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
202 {
203 struct cir_softc *sc;
204 int error;
205
206 sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
207 if (sc == NULL)
208 return (ENXIO);
209 if (!device_is_active(sc->sc_dev))
210 return (EIO);
211
212 switch (cmd) {
213 case FIONBIO:
214 /* All handled in the upper FS layer. */
215 error = 0;
216 break;
217 case CIR_GET_PARAMS:
218 *(struct cir_params *)addr = sc->sc_params;
219 error = 0;
220 break;
221 case CIR_SET_PARAMS:
222 error = sc->sc_methods->im_setparams(sc->sc_handle,
223 (struct cir_params *)addr);
224 if (!error)
225 sc->sc_params = *(struct cir_params *)addr;
226 break;
227 default:
228 error = EINVAL;
229 break;
230 }
231 return (error);
232 }
233
234 int
cirpoll(dev_t dev,int events,struct lwp * l)235 cirpoll(dev_t dev, int events, struct lwp *l)
236 {
237 struct cir_softc *sc;
238 int revents;
239 int s;
240
241 sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
242 if (sc == NULL)
243 return (POLLERR);
244 if (!device_is_active(sc->sc_dev))
245 return (POLLERR);
246
247 revents = 0;
248 s = splir();
249 if (events & (POLLIN | POLLRDNORM))
250 if (sc->sc_rdframes > 0)
251 revents |= events & (POLLIN | POLLRDNORM);
252
253 #if 0
254 /* How about write? */
255 if (events & (POLLOUT | POLLWRNORM))
256 if (/* ??? */)
257 revents |= events & (POLLOUT | POLLWRNORM);
258 #endif
259
260 if (revents == 0) {
261 if (events & (POLLIN | POLLRDNORM))
262 selrecord(l, &sc->sc_rdsel);
263
264 #if 0
265 if (events & (POLLOUT | POLLWRNORM))
266 selrecord(p, &sc->sc_wrsel);
267 #endif
268 }
269
270 splx(s);
271 return (revents);
272 }
273
274 MODULE(MODULE_CLASS_DRIVER, cir, "ir");
275
276 #ifdef _MODULE
277 #include "ioconf.c"
278 #endif
279
280 static int
cir_modcmd(modcmd_t cmd,void * opaque)281 cir_modcmd(modcmd_t cmd, void *opaque)
282 {
283 int error = 0;
284 #ifdef _MODULE
285 int bmaj = -1, cmaj = -1;
286 #endif
287
288 switch (cmd) {
289 case MODULE_CMD_INIT:
290 #ifdef _MODULE
291 error = devsw_attach("cir", NULL, &bmaj, &cir_cdevsw, &cmaj);
292 if (error)
293 return error;
294 error = config_init_component(cfdriver_ioconf_cir,
295 cfattach_ioconf_cir, cfdata_ioconf_cir);
296 if (error)
297 devsw_detach(NULL, &cir_cdevsw);
298 #endif
299 return error;
300 case MODULE_CMD_FINI:
301 #ifdef _MODULE
302 return config_fini_component(cfdriver_ioconf_cir,
303 cfattach_ioconf_cir, cfdata_ioconf_cir);
304 devsw_detach(NULL, &cir_cdevsw);
305 #endif
306 return error;
307 default:
308 return ENOTTY;
309 }
310 }
311