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      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 (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: 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