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
50dev_type_open(ciropen);
51dev_type_close(circlose);
52dev_type_read(cirread);
53dev_type_write(cirwrite);
54dev_type_ioctl(cirioctl);
55dev_type_poll(cirpoll);
56
57const 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
72int cir_match(device_t parent, cfdata_t match, void *aux);
73void cir_attach(device_t parent, device_t self, void *aux);
74int cir_detach(device_t self, int flags);
75
76CFATTACH_DECL_NEW(cir, sizeof(struct cir_softc),
77    cir_match, cir_attach, cir_detach, NULL);
78
79extern struct cfdriver cir_cd;
80
81#define CIRUNIT(dev) (minor(dev))
82
83int
84cir_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
91void
92cir_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
113int
114cir_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
131int
132ciropen(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
156int
157circlose(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
174int
175cirread(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
187int
188cirwrite(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
200int
201cirioctl(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
234int
235cirpoll(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
274MODULE(MODULE_CLASS_DRIVER, cir, "ir");
275
276#ifdef _MODULE
277#include "ioconf.c"
278#endif
279
280static int
281cir_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