1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2018 Emmanuel Vadot <manu@FreeBSD.org> 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 AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, 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 __FBSDID("$FreeBSD$"); 31 32 #include "opt_platform.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/bus.h> 37 #include <sys/conf.h> 38 #include <sys/endian.h> 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 42 #include <machine/bus.h> 43 44 #include <dev/pwm/pwmbus.h> 45 46 #include "pwmbus_if.h" 47 48 struct pwmbus_channel_data { 49 int reserved; 50 char *name; 51 }; 52 53 struct pwmbus_softc { 54 device_t dev; 55 device_t parent; 56 57 u_int nchannels; 58 }; 59 60 static int 61 pwmbus_probe(device_t dev) 62 { 63 64 device_set_desc(dev, "PWM bus"); 65 return (BUS_PROBE_GENERIC); 66 } 67 68 static int 69 pwmbus_attach(device_t dev) 70 { 71 struct pwmbus_softc *sc; 72 73 sc = device_get_softc(dev); 74 sc->dev = dev; 75 sc->parent = device_get_parent(dev); 76 77 if (PWMBUS_CHANNEL_COUNT(sc->parent, &sc->nchannels) != 0 || 78 sc->nchannels == 0) { 79 device_printf(sc->dev, "No channels on parent %s\n", 80 device_get_nameunit(sc->parent)); 81 return (ENXIO); 82 } 83 84 device_add_child(sc->dev, "pwmc", -1); 85 86 bus_generic_probe(dev); 87 88 return (bus_generic_attach(dev)); 89 } 90 91 static int 92 pwmbus_detach(device_t dev) 93 { 94 int rv; 95 96 if ((rv = bus_generic_detach(dev)) == 0) 97 rv = device_delete_children(dev); 98 99 return (rv); 100 } 101 102 static int 103 pwmbus_channel_config(device_t dev, u_int chan, u_int period, u_int duty) 104 { 105 return (PWMBUS_CHANNEL_CONFIG(device_get_parent(dev), chan, period, duty)); 106 } 107 108 static int 109 pwmbus_channel_get_config(device_t dev, u_int chan, u_int *period, u_int *duty) 110 { 111 return (PWMBUS_CHANNEL_GET_CONFIG(device_get_parent(dev), chan, period, duty)); 112 } 113 114 static int 115 pwmbus_channel_get_flags(device_t dev, u_int chan, uint32_t *flags) 116 { 117 return (PWMBUS_CHANNEL_GET_FLAGS(device_get_parent(dev), chan, flags)); 118 } 119 120 static int 121 pwmbus_channel_enable(device_t dev, u_int chan, bool enable) 122 { 123 return (PWMBUS_CHANNEL_ENABLE(device_get_parent(dev), chan, enable)); 124 } 125 126 static int 127 pwmbus_channel_set_flags(device_t dev, u_int chan, uint32_t flags) 128 { 129 return (PWMBUS_CHANNEL_SET_FLAGS(device_get_parent(dev), chan, flags)); 130 } 131 132 static int 133 pwmbus_channel_is_enabled(device_t dev, u_int chan, bool *enable) 134 { 135 return (PWMBUS_CHANNEL_IS_ENABLED(device_get_parent(dev), chan, enable)); 136 } 137 138 static int 139 pwmbus_channel_count(device_t dev, u_int *nchannel) 140 { 141 return (PWMBUS_CHANNEL_COUNT(device_get_parent(dev), nchannel)); 142 } 143 144 static device_method_t pwmbus_methods[] = { 145 /* device_if */ 146 DEVMETHOD(device_probe, pwmbus_probe), 147 DEVMETHOD(device_attach, pwmbus_attach), 148 DEVMETHOD(device_detach, pwmbus_detach), 149 150 /* pwmbus_if */ 151 DEVMETHOD(pwmbus_channel_count, pwmbus_channel_count), 152 DEVMETHOD(pwmbus_channel_config, pwmbus_channel_config), 153 DEVMETHOD(pwmbus_channel_get_config, pwmbus_channel_get_config), 154 DEVMETHOD(pwmbus_channel_set_flags, pwmbus_channel_set_flags), 155 DEVMETHOD(pwmbus_channel_get_flags, pwmbus_channel_get_flags), 156 DEVMETHOD(pwmbus_channel_enable, pwmbus_channel_enable), 157 DEVMETHOD(pwmbus_channel_is_enabled, pwmbus_channel_is_enabled), 158 159 DEVMETHOD_END 160 }; 161 162 static driver_t pwmbus_driver = { 163 "pwmbus", 164 pwmbus_methods, 165 sizeof(struct pwmbus_softc), 166 }; 167 static devclass_t pwmbus_devclass; 168 169 EARLY_DRIVER_MODULE(pwmbus, pwm, pwmbus_driver, pwmbus_devclass, 0, 0, 170 BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_MIDDLE); 171 MODULE_VERSION(pwmbus, 1); 172