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sys/dev/gpio/gpioregulator.c
- This file was added.
| /*- | |||||
| * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca> | |||||
| * All rights reserved. | |||||
| * | |||||
| * Redistribution and use in source and binary forms, with or without | |||||
| * modification, are permitted provided that the following conditions | |||||
| * are met: | |||||
| * 1. Redistributions of source code must retain the above copyright | |||||
| * notice, this list of conditions and the following disclaimer. | |||||
| * 2. Redistributions in binary form must reproduce the above copyright | |||||
| * notice, this list of conditions and the following disclaimer in the | |||||
| * documentation and/or other materials provided with the distribution. | |||||
| * | |||||
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |||||
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |||||
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |||||
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |||||
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | |||||
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |||||
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | |||||
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |||||
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
| * SUCH DAMAGE. | |||||
| * | |||||
| * $FreeBSD$ | |||||
| */ | |||||
| /* | |||||
| * GPIO controlled regulators | |||||
| */ | |||||
| #include <sys/cdefs.h> | |||||
| __FBSDID("$FreeBSD$"); | |||||
| #include <sys/param.h> | |||||
| #include <sys/systm.h> | |||||
| #include <sys/bus.h> | |||||
| #include <sys/rman.h> | |||||
| #include <sys/kernel.h> | |||||
| #include <sys/module.h> | |||||
| #include <sys/gpio.h> | |||||
| #include <dev/ofw/ofw_bus.h> | |||||
| #include <dev/ofw/ofw_bus_subr.h> | |||||
| #include <dev/gpio/gpiobusvar.h> | |||||
| #include <dev/extres/regulator/regulator.h> | |||||
| #include "regdev_if.h" | |||||
| struct gpioregulator_state { | |||||
| int val; | |||||
| uint32_t mask; | |||||
| }; | |||||
| struct gpioregulator_init_def { | |||||
| struct regnode_init_def reg_init_def; | |||||
| struct gpiobus_pin *enable_pin; | |||||
| int enable_pin_valid; | |||||
| int startup_delay_us; | |||||
| int nstates; | |||||
| struct gpioregulator_state *states; | |||||
| int npins; | |||||
| struct gpiobus_pin **pins; | |||||
| }; | |||||
| struct gpioregulator_reg_sc { | |||||
| struct regnode *regnode; | |||||
| device_t base_dev; | |||||
| struct regnode_std_param *param; | |||||
| struct gpioregulator_init_def *def; | |||||
| }; | |||||
| struct gpioregulator_softc { | |||||
| device_t dev; | |||||
| struct gpioregulator_reg_sc *reg_sc; | |||||
| struct gpioregulator_init_def init_def; | |||||
| }; | |||||
| static int | |||||
| gpioregulator_regnode_init(struct regnode *regnode) | |||||
| { | |||||
| struct gpioregulator_reg_sc *sc; | |||||
| int error, n; | |||||
| sc = regnode_get_softc(regnode); | |||||
| if (sc->def->enable_pin_valid == 1) { | |||||
| error = gpio_pin_setflags(sc->def->enable_pin, GPIO_PIN_OUTPUT); | |||||
| if (error != 0) | |||||
| return (error); | |||||
| } | |||||
| for (n = 0; n < sc->def->npins; n++) { | |||||
| error = gpio_pin_setflags(sc->def->pins[n], GPIO_PIN_OUTPUT); | |||||
| if (error != 0) | |||||
| return (error); | |||||
| } | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| gpioregulator_regnode_enable(struct regnode *regnode, bool enable, int *udelay) | |||||
| { | |||||
| struct gpioregulator_reg_sc *sc; | |||||
| bool active; | |||||
| int error; | |||||
| sc = regnode_get_softc(regnode); | |||||
| if (sc->def->enable_pin_valid == 1) { | |||||
| active = enable; | |||||
| if (!sc->param->enable_active_high) | |||||
| active = !active; | |||||
| error = gpio_pin_set_active(sc->def->enable_pin, active); | |||||
| if (error != 0) | |||||
| return (error); | |||||
| } | |||||
| *udelay = sc->def->startup_delay_us; | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| gpioregulator_regnode_set_voltage(struct regnode *regnode, int min_uvolt, | |||||
| int max_uvolt, int *udelay) | |||||
| { | |||||
| struct gpioregulator_reg_sc *sc; | |||||
| const struct gpioregulator_state *state; | |||||
| int error, n; | |||||
| sc = regnode_get_softc(regnode); | |||||
| state = NULL; | |||||
| for (n = 0; n < sc->def->nstates; n++) { | |||||
| if (sc->def->states[n].val >= min_uvolt && | |||||
| sc->def->states[n].val <= max_uvolt) { | |||||
| state = &sc->def->states[n]; | |||||
| break; | |||||
| } | |||||
| } | |||||
| if (state == NULL) | |||||
| return (EINVAL); | |||||
| for (n = 0; n < sc->def->npins; n++) { | |||||
| error = gpio_pin_set_active(sc->def->pins[n], | |||||
| (state->mask >> n) & 1); | |||||
| if (error != 0) | |||||
| return (error); | |||||
| } | |||||
| *udelay = sc->def->startup_delay_us; | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| gpioregulator_regnode_get_voltage(struct regnode *regnode, int *uvolt) | |||||
| { | |||||
| struct gpioregulator_reg_sc *sc; | |||||
| uint32_t mask; | |||||
| int error, n; | |||||
| bool active; | |||||
| sc = regnode_get_softc(regnode); | |||||
| mask = 0; | |||||
| for (n = 0; n < sc->def->npins; n++) { | |||||
| error = gpio_pin_is_active(sc->def->pins[n], &active); | |||||
| if (error != 0) | |||||
| return (error); | |||||
| mask |= (active << n); | |||||
| } | |||||
| for (n = 0; n < sc->def->nstates; n++) { | |||||
| if (sc->def->states[n].mask == mask) { | |||||
| *uvolt = sc->def->states[n].val; | |||||
| return (0); | |||||
| } | |||||
| } | |||||
| return (EIO); | |||||
| } | |||||
| static regnode_method_t gpioregulator_regnode_methods[] = { | |||||
| /* Regulator interface */ | |||||
| REGNODEMETHOD(regnode_init, gpioregulator_regnode_init), | |||||
| REGNODEMETHOD(regnode_enable, gpioregulator_regnode_enable), | |||||
| REGNODEMETHOD(regnode_set_voltage, gpioregulator_regnode_set_voltage), | |||||
| REGNODEMETHOD(regnode_get_voltage, gpioregulator_regnode_get_voltage), | |||||
| REGNODEMETHOD_END | |||||
| }; | |||||
| DEFINE_CLASS_1(gpioregulator_regnode, gpioregulator_regnode_class, | |||||
| gpioregulator_regnode_methods, sizeof(struct gpioregulator_reg_sc), | |||||
| regnode_class); | |||||
| static int | |||||
| gpioregulator_parse_fdt(struct gpioregulator_softc *sc) | |||||
| { | |||||
| uint32_t *pstates, mask; | |||||
| phandle_t node; | |||||
| ssize_t len; | |||||
| int error, n; | |||||
| node = ofw_bus_get_node(sc->dev); | |||||
| pstates = NULL; | |||||
| mask = 0; | |||||
| error = regulator_parse_ofw_stdparam(sc->dev, node, | |||||
| &sc->init_def.reg_init_def); | |||||
| if (error != 0) | |||||
| return (error); | |||||
| /* "states" property (required) */ | |||||
| len = OF_getencprop_alloc(node, "states", sizeof(*pstates), | |||||
| (void **)&pstates); | |||||
| if (len < 2) { | |||||
| device_printf(sc->dev, "invalid 'states' property\n"); | |||||
| error = EINVAL; | |||||
| goto done; | |||||
| } | |||||
| sc->init_def.nstates = len / 2; | |||||
| sc->init_def.states = malloc(sc->init_def.nstates * | |||||
| sizeof(*sc->init_def.states), M_DEVBUF, M_WAITOK); | |||||
| for (n = 0; n < sc->init_def.nstates; n++) { | |||||
| sc->init_def.states[n].val = pstates[n * 2 + 0]; | |||||
| sc->init_def.states[n].mask = pstates[n * 2 + 1]; | |||||
| mask |= sc->init_def.states[n].mask; | |||||
| } | |||||
| /* "startup-delay-us" property (optional) */ | |||||
| len = OF_getencprop(node, "startup-delay-us", | |||||
| &sc->init_def.startup_delay_us, | |||||
| sizeof(sc->init_def.startup_delay_us)); | |||||
| if (len <= 0) | |||||
| sc->init_def.startup_delay_us = 0; | |||||
| /* "enable-gpio" property (optional) */ | |||||
| error = gpio_pin_get_by_ofw_property(sc->dev, node, "enable-gpio", | |||||
| &sc->init_def.enable_pin); | |||||
| if (error == 0) | |||||
| sc->init_def.enable_pin_valid = 1; | |||||
| /* "gpios" property */ | |||||
| sc->init_def.npins = 32 - __builtin_clz(mask); | |||||
| sc->init_def.pins = malloc(sc->init_def.npins * | |||||
| sizeof(sc->init_def.pins), M_DEVBUF, M_WAITOK); | |||||
| for (n = 0; n < sc->init_def.npins; n++) { | |||||
| error = gpio_pin_get_by_ofw_idx(sc->dev, node, n, | |||||
| &sc->init_def.pins[n]); | |||||
| if (error != 0) { | |||||
| device_printf(sc->dev, "cannot get pin %d\n", n); | |||||
| goto done; | |||||
| } | |||||
| } | |||||
| done: | |||||
| if (error != 0) { | |||||
| for (n = 0; n < sc->init_def.npins; n++) { | |||||
| if (sc->init_def.pins[n] != NULL) | |||||
| gpio_pin_release(sc->init_def.pins[n]); | |||||
| } | |||||
| free(sc->init_def.states, M_DEVBUF); | |||||
| free(sc->init_def.pins, M_DEVBUF); | |||||
| } | |||||
| OF_prop_free(pstates); | |||||
| return (error); | |||||
| } | |||||
| static int | |||||
| gpioregulator_probe(device_t dev) | |||||
| { | |||||
| if (!ofw_bus_is_compatible(dev, "regulator-gpio")) | |||||
| return (ENXIO); | |||||
| device_set_desc(dev, "GPIO controlled regulator"); | |||||
| return (BUS_PROBE_GENERIC); | |||||
| } | |||||
| static int | |||||
| gpioregulator_attach(device_t dev) | |||||
| { | |||||
| struct gpioregulator_softc *sc; | |||||
| struct regnode *regnode; | |||||
| phandle_t node; | |||||
| int error; | |||||
| sc = device_get_softc(dev); | |||||
| sc->dev = dev; | |||||
| node = ofw_bus_get_node(dev); | |||||
| error = gpioregulator_parse_fdt(sc); | |||||
| if (error != 0) { | |||||
| device_printf(dev, "cannot parse parameters\n"); | |||||
| return (ENXIO); | |||||
| } | |||||
| sc->init_def.reg_init_def.id = 1; | |||||
| sc->init_def.reg_init_def.ofw_node = node; | |||||
| regnode = regnode_create(dev, &gpioregulator_regnode_class, | |||||
| &sc->init_def.reg_init_def); | |||||
| if (regnode == NULL) { | |||||
| device_printf(dev, "cannot create regulator\n"); | |||||
| return (ENXIO); | |||||
| } | |||||
| sc->reg_sc = regnode_get_softc(regnode); | |||||
| sc->reg_sc->regnode = regnode; | |||||
| sc->reg_sc->base_dev = dev; | |||||
| sc->reg_sc->param = regnode_get_stdparam(regnode); | |||||
| sc->reg_sc->def = &sc->init_def; | |||||
| regnode_register(regnode); | |||||
| return (0); | |||||
| } | |||||
| static device_method_t gpioregulator_methods[] = { | |||||
| /* Device interface */ | |||||
| DEVMETHOD(device_probe, gpioregulator_probe), | |||||
| DEVMETHOD(device_attach, gpioregulator_attach), | |||||
| /* Regdev interface */ | |||||
| DEVMETHOD(regdev_map, regdev_default_ofw_map), | |||||
| DEVMETHOD_END | |||||
| }; | |||||
| static driver_t gpioregulator_driver = { | |||||
| "gpioregulator", | |||||
| gpioregulator_methods, | |||||
| sizeof(struct gpioregulator_softc), | |||||
| }; | |||||
| static devclass_t gpioregulator_devclass; | |||||
| EARLY_DRIVER_MODULE(gpioregulator, simplebus, gpioregulator_driver, | |||||
| gpioregulator_devclass, 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LAST); | |||||
| MODULE_VERSION(gpioregulator, 1); | |||||