1 /* $NetBSD: spdif_tx.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2019 Jared 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: spdif_tx.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/device.h> 35 #include <sys/systm.h> 36 #include <sys/sysctl.h> 37 #include <sys/kmem.h> 38 39 #include <dev/audio/audio_dai.h> 40 41 #include <dev/fdt/fdtvar.h> 42 43 struct spdif_tx_softc { 44 device_t sc_dev; 45 struct audio_dai_device sc_dai; 46 }; 47 48 static int spdif_tx_match(device_t, cfdata_t, void *); 49 static void spdif_tx_attach(device_t, device_t, void *); 50 51 static const struct device_compatible_entry compat_data[] = { 52 { .compat = "linux,spdif-dit" }, 53 DEVICE_COMPAT_EOL 54 }; 55 56 CFATTACH_DECL_NEW(spdiftx, sizeof(struct spdif_tx_softc), 57 spdif_tx_match, spdif_tx_attach, NULL, NULL); 58 59 static int 60 spdif_tx_set_format(audio_dai_tag_t dai, u_int format) 61 { 62 return 0; 63 } 64 65 static int 66 spdif_tx_add_device(audio_dai_tag_t dai, audio_dai_tag_t aux) 67 { 68 return 0; 69 } 70 71 static const struct audio_hw_if spdif_tx_hw_if = { }; 72 73 static audio_dai_tag_t 74 spdif_tx_dai_get_tag(device_t dev, const void *data, size_t len) 75 { 76 struct spdif_tx_softc * const sc = device_private(dev); 77 78 if (len != 4) 79 return NULL; 80 81 return &sc->sc_dai; 82 } 83 84 static struct fdtbus_dai_controller_func spdif_tx_dai_funcs = { 85 .get_tag = spdif_tx_dai_get_tag 86 }; 87 88 static int 89 spdif_tx_match(device_t parent, cfdata_t cf, void *aux) 90 { 91 struct fdt_attach_args * const faa = aux; 92 93 return of_compatible_match(faa->faa_phandle, compat_data); 94 } 95 96 static void 97 spdif_tx_attach(device_t parent, device_t self, void *aux) 98 { 99 struct spdif_tx_softc * const sc = device_private(self); 100 struct fdt_attach_args * const faa = aux; 101 const int phandle = faa->faa_phandle; 102 103 sc->sc_dev = self; 104 105 aprint_naive("\n"); 106 aprint_normal(": SPDIF transmitter\n"); 107 108 sc->sc_dai.dai_set_format = spdif_tx_set_format; 109 sc->sc_dai.dai_add_device = spdif_tx_add_device; 110 sc->sc_dai.dai_hw_if = &spdif_tx_hw_if; 111 sc->sc_dai.dai_dev = self; 112 sc->sc_dai.dai_priv = sc; 113 fdtbus_register_dai_controller(self, phandle, &spdif_tx_dai_funcs); 114 } 115