1 /* $NetBSD: hdmicec.c,v 1.2 2017/10/28 04:53:56 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: hdmicec.c,v 1.2 2017/10/28 04:53:56 riastradh Exp $");
31
32 #include <sys/param.h>
33 #include <sys/types.h>
34 #include <sys/device.h>
35 #include <sys/conf.h>
36 #include <sys/ioctl.h>
37 #include <sys/select.h>
38 #include <sys/atomic.h>
39
40 #include <dev/hdmicec/hdmicec_if.h>
41 #include <dev/hdmicec/hdmicecio.h>
42
43 #include "ioconf.h"
44
45 #define CEC_MAX_FRAMESIZE 16
46
47 struct hdmicec_softc {
48 device_t sc_dev;
49
50 void * sc_priv;
51 const struct hdmicec_hw_if *sc_hwif;
52
53 u_int sc_busy;
54 };
55
56 static dev_type_open(hdmicec_open);
57 static dev_type_close(hdmicec_close);
58 static dev_type_read(hdmicec_read);
59 static dev_type_write(hdmicec_write);
60 static dev_type_ioctl(hdmicec_ioctl);
61 static dev_type_poll(hdmicec_poll);
62
63 static int hdmicec_match(device_t, cfdata_t, void *);
64 static void hdmicec_attach(device_t, device_t, void *);
65
66 const struct cdevsw hdmicec_cdevsw = {
67 .d_open = hdmicec_open,
68 .d_close = hdmicec_close,
69 .d_read = hdmicec_read,
70 .d_write = hdmicec_write,
71 .d_ioctl = hdmicec_ioctl,
72 .d_stop = nostop,
73 .d_tty = notty,
74 .d_poll = hdmicec_poll,
75 .d_mmap = nommap,
76 .d_kqfilter = nokqfilter,
77 .d_flag = D_MPSAFE
78 };
79
80 CFATTACH_DECL_NEW(hdmicec, sizeof(struct hdmicec_softc), hdmicec_match,
81 hdmicec_attach, NULL, NULL);
82
83 static int
hdmicec_match(device_t parent,cfdata_t match,void * opaque)84 hdmicec_match(device_t parent, cfdata_t match, void *opaque)
85 {
86 return 1;
87 }
88
89 static void
hdmicec_attach(device_t parent,device_t self,void * opaque)90 hdmicec_attach(device_t parent, device_t self, void *opaque)
91 {
92 struct hdmicec_softc *sc = device_private(self);
93 struct hdmicec_attach_args *caa = opaque;
94
95 sc->sc_dev = self;
96 sc->sc_priv = caa->priv;
97 sc->sc_hwif = caa->hwif;
98
99 aprint_naive("\n");
100 aprint_normal("\n");
101 }
102
103 static int
hdmicec_open(dev_t dev,int flag,int fmt,lwp_t * l)104 hdmicec_open(dev_t dev, int flag, int fmt, lwp_t *l)
105 {
106 struct hdmicec_softc *sc =
107 device_lookup_private(&hdmicec_cd, minor(dev));
108 int error;
109
110 if (sc == NULL)
111 return ENXIO;
112
113 if (atomic_cas_uint(&sc->sc_busy, 0, 1) != 1)
114 return EBUSY;
115
116 if (sc->sc_hwif->open != NULL) {
117 error = sc->sc_hwif->open(sc->sc_priv, flag);
118 if (error) {
119 atomic_swap_uint(&sc->sc_busy, 0);
120 return error;
121 }
122 }
123
124 return 0;
125 }
126
127 static int
hdmicec_close(dev_t dev,int flag,int fmt,lwp_t * l)128 hdmicec_close(dev_t dev, int flag, int fmt, lwp_t *l)
129 {
130 struct hdmicec_softc *sc =
131 device_lookup_private(&hdmicec_cd, minor(dev));
132
133 if (sc->sc_hwif->close)
134 sc->sc_hwif->close(sc->sc_priv);
135
136 atomic_swap_uint(&sc->sc_busy, 0);
137 return 0;
138 }
139
140 static int
hdmicec_read(dev_t dev,struct uio * uio,int flags)141 hdmicec_read(dev_t dev, struct uio *uio, int flags)
142 {
143 struct hdmicec_softc *sc =
144 device_lookup_private(&hdmicec_cd, minor(dev));
145 uint8_t data[CEC_MAX_FRAMESIZE];
146 ssize_t len;
147 int error;
148
149 if (uio->uio_resid < CEC_MAX_FRAMESIZE)
150 return EINVAL;
151
152 len = sc->sc_hwif->recv(sc->sc_priv, data, sizeof(data));
153 if (len < 0)
154 return EIO;
155
156 error = uiomove(data, len, uio);
157 if (error)
158 return error;
159
160 return 0;
161 }
162
163 static int
hdmicec_write(dev_t dev,struct uio * uio,int flags)164 hdmicec_write(dev_t dev, struct uio *uio, int flags)
165 {
166 struct hdmicec_softc *sc =
167 device_lookup_private(&hdmicec_cd, minor(dev));
168 uint8_t data[CEC_MAX_FRAMESIZE];
169 size_t len = uio->uio_resid;
170 int error;
171
172 if (len > CEC_MAX_FRAMESIZE)
173 return EINVAL;
174
175 error = uiomove(data, len, uio);
176 if (error)
177 return error;
178
179 return sc->sc_hwif->send(sc->sc_priv, data, len);
180 }
181
182 static int
hdmicec_ioctl(dev_t dev,u_long cmd,void * data,int flag,lwp_t * l)183 hdmicec_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l)
184 {
185 struct hdmicec_softc *sc =
186 device_lookup_private(&hdmicec_cd, minor(dev));
187
188 return sc->sc_hwif->ioctl(sc->sc_priv, cmd, data, flag, l);
189 }
190
191 static int
hdmicec_poll(dev_t dev,int events,lwp_t * l)192 hdmicec_poll(dev_t dev, int events, lwp_t *l)
193 {
194 struct hdmicec_softc *sc =
195 device_lookup_private(&hdmicec_cd, minor(dev));
196
197 return sc->sc_hwif->poll(sc->sc_priv, events, l);
198 }
199