1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2018 Emmanuel Vadot <manu@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include "opt_platform.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/conf.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/time.h> 40 41 #include <dev/pwm/pwmbus.h> 42 #include <dev/pwm/pwmc.h> 43 44 #include "pwmbus_if.h" 45 46 #ifdef FDT 47 #include <dev/ofw/openfirm.h> 48 #include <dev/ofw/ofw_bus.h> 49 #include <dev/ofw/ofw_bus_subr.h> 50 51 static struct ofw_compat_data compat_data[] = { 52 {"freebsd,pwmc", true}, 53 {NULL, false}, 54 }; 55 56 PWMBUS_FDT_PNP_INFO(compat_data); 57 58 #endif 59 60 struct pwmc_softc { 61 device_t dev; 62 struct cdev *cdev; 63 u_int chan; 64 }; 65 66 static int 67 pwm_ioctl(struct cdev *dev, u_long cmd, caddr_t data, 68 int fflag, struct thread *td) 69 { 70 struct pwmc_softc *sc; 71 struct pwm_state state; 72 device_t bus; 73 int rv = 0; 74 75 sc = dev->si_drv1; 76 bus = device_get_parent(sc->dev); 77 78 switch (cmd) { 79 case PWMSETSTATE: 80 bcopy(data, &state, sizeof(state)); 81 rv = PWMBUS_CHANNEL_CONFIG(bus, sc->chan, 82 state.period, state.duty); 83 if (rv != 0) 84 return (rv); 85 86 rv = PWMBUS_CHANNEL_SET_FLAGS(bus, 87 sc->chan, state.flags); 88 if (rv != 0 && rv != EOPNOTSUPP) 89 return (rv); 90 91 rv = PWMBUS_CHANNEL_ENABLE(bus, sc->chan, 92 state.enable); 93 break; 94 case PWMGETSTATE: 95 bcopy(data, &state, sizeof(state)); 96 rv = PWMBUS_CHANNEL_GET_CONFIG(bus, sc->chan, 97 &state.period, &state.duty); 98 if (rv != 0) 99 return (rv); 100 101 rv = PWMBUS_CHANNEL_GET_FLAGS(bus, sc->chan, 102 &state.flags); 103 if (rv != 0) 104 return (rv); 105 106 rv = PWMBUS_CHANNEL_IS_ENABLED(bus, sc->chan, 107 &state.enable); 108 if (rv != 0) 109 return (rv); 110 bcopy(&state, data, sizeof(state)); 111 break; 112 } 113 114 return (rv); 115 } 116 117 static struct cdevsw pwm_cdevsw = { 118 .d_version = D_VERSION, 119 .d_name = "pwmc", 120 .d_ioctl = pwm_ioctl 121 }; 122 123 static void 124 pwmc_setup_label(struct pwmc_softc *sc) 125 { 126 const char *hintlabel; 127 #ifdef FDT 128 void *label; 129 130 if (OF_getprop_alloc(ofw_bus_get_node(sc->dev), "label", &label) > 0) { 131 make_dev_alias(sc->cdev, "pwm/%s", (char *)label); 132 OF_prop_free(label); 133 } 134 #endif 135 136 if (resource_string_value(device_get_name(sc->dev), 137 device_get_unit(sc->dev), "label", &hintlabel) == 0) { 138 make_dev_alias(sc->cdev, "pwm/%s", hintlabel); 139 } 140 } 141 142 static int 143 pwmc_probe(device_t dev) 144 { 145 int rv; 146 147 rv = BUS_PROBE_NOWILDCARD; 148 149 #ifdef FDT 150 if (!ofw_bus_status_okay(dev)) 151 return (ENXIO); 152 153 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) { 154 rv = BUS_PROBE_DEFAULT; 155 } 156 #endif 157 158 device_set_desc(dev, "PWM Control"); 159 return (rv); 160 } 161 162 static int 163 pwmc_attach(device_t dev) 164 { 165 struct pwmc_softc *sc; 166 struct make_dev_args args; 167 int error; 168 169 sc = device_get_softc(dev); 170 sc->dev = dev; 171 172 if ((error = pwmbus_get_channel(dev, &sc->chan)) != 0) 173 return (error); 174 175 make_dev_args_init(&args); 176 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK; 177 args.mda_devsw = &pwm_cdevsw; 178 args.mda_uid = UID_ROOT; 179 args.mda_gid = GID_OPERATOR; 180 args.mda_mode = 0660; 181 args.mda_si_drv1 = sc; 182 error = make_dev_s(&args, &sc->cdev, "pwm/pwmc%d.%d", 183 device_get_unit(device_get_parent(dev)), sc->chan); 184 if (error != 0) { 185 device_printf(dev, "Failed to make PWM device\n"); 186 return (error); 187 } 188 189 pwmc_setup_label(sc); 190 191 return (0); 192 } 193 194 static int 195 pwmc_detach(device_t dev) 196 { 197 struct pwmc_softc *sc; 198 199 sc = device_get_softc(dev); 200 destroy_dev(sc->cdev); 201 202 return (0); 203 } 204 205 static device_method_t pwmc_methods[] = { 206 /* device_if */ 207 DEVMETHOD(device_probe, pwmc_probe), 208 DEVMETHOD(device_attach, pwmc_attach), 209 DEVMETHOD(device_detach, pwmc_detach), 210 211 DEVMETHOD_END 212 }; 213 214 static driver_t pwmc_driver = { 215 "pwmc", 216 pwmc_methods, 217 sizeof(struct pwmc_softc), 218 }; 219 static devclass_t pwmc_devclass; 220 221 DRIVER_MODULE(pwmc, pwmbus, pwmc_driver, pwmc_devclass, 0, 0); 222 MODULE_DEPEND(pwmc, pwmbus, 1, 1, 1); 223 MODULE_VERSION(pwmc, 1); 224