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 (at) 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 84 hdmicec_match(device_t parent, cfdata_t match, void *opaque) 85 { 86 return 1; 87 } 88 89 static void 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 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 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 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 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 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 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
Indexes created Sat Sep 20 22:09:52 GMT 2025