act8846.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2019 Michal Meloun <mmel@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 /*
   32  * ACT8846 PMIC driver
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/malloc.h>
   41 #include <sys/rman.h>
   42 #include <sys/sx.h>
   43 
   44 #include <machine/bus.h>
   45 
   46 #include <dev/extres/regulator/regulator.h>
   47 #include <dev/fdt/fdt_pinctrl.h>
   48 #include <dev/iicbus/iiconf.h>
   49 #include <dev/iicbus/iicbus.h>
   50 #include <dev/ofw/ofw_bus.h>
   51 #include <dev/ofw/ofw_bus_subr.h>
   52 
   53 #include <dev/iicbus/pmic/act8846.h>
   54 
   55 #include "regdev_if.h"
   56 
   57 static struct ofw_compat_data compat_data[] = {
   58         {"active-semi,act8846", 1},
   59         {NULL,                  0}
   60 };
   61 
   62 #define LOCK(_sc)               sx_xlock(&(_sc)->lock)
   63 #define UNLOCK(_sc)             sx_xunlock(&(_sc)->lock)
   64 #define LOCK_INIT(_sc)          sx_init(&(_sc)->lock, "act8846")
   65 #define LOCK_DESTROY(_sc)       sx_destroy(&(_sc)->lock);
   66 #define ASSERT_LOCKED(_sc)      sx_assert(&(_sc)->lock, SA_XLOCKED);
   67 #define ASSERT_UNLOCKED(_sc)    sx_assert(&(_sc)->lock, SA_UNLOCKED);
   68 
   69 
   70 /*
   71  * Raw register access function.
   72  */
   73 int
   74 act8846_read(struct act8846_softc *sc, uint8_t reg, uint8_t *val)
   75 {
   76         uint8_t addr;
   77         int rv;
   78         struct iic_msg msgs[2] = {
   79                 {0, IIC_M_WR, 1, &addr},
   80                 {0, IIC_M_RD, 1, val},
   81         };
   82 
   83         msgs[0].slave = sc->bus_addr;
   84         msgs[1].slave = sc->bus_addr;
   85         addr = reg;
   86 
   87         rv = iicbus_transfer_excl(sc->dev, msgs, 2, IIC_INTRWAIT);
   88         if (rv != 0) {
   89                 device_printf(sc->dev,
   90                     "Error when reading reg 0x%02X, rv: %d\n", reg,  rv);
   91                 return (EIO);
   92         }
   93 
   94         return (0);
   95 }
   96 
   97 int act8846_read_buf(struct act8846_softc *sc, uint8_t reg, uint8_t *buf,
   98     size_t size)
   99 {
  100         uint8_t addr;
  101         int rv;
  102         struct iic_msg msgs[2] = {
  103                 {0, IIC_M_WR, 1, &addr},
  104                 {0, IIC_M_RD, size, buf},
  105         };
  106 
  107         msgs[0].slave = sc->bus_addr;
  108         msgs[1].slave = sc->bus_addr;
  109         addr = reg;
  110 
  111         rv = iicbus_transfer_excl(sc->dev, msgs, 2, IIC_INTRWAIT);
  112         if (rv != 0) {
  113                 device_printf(sc->dev,
  114                     "Error when reading reg 0x%02X, rv: %d\n", reg,  rv);
  115                 return (EIO);
  116         }
  117 
  118         return (0);
  119 }
  120 
  121 int
  122 act8846_write(struct act8846_softc *sc, uint8_t reg, uint8_t val)
  123 {
  124         uint8_t data[2];
  125         int rv;
  126 
  127         struct iic_msg msgs[1] = {
  128                 {0, IIC_M_WR, 2, data},
  129         };
  130 
  131         msgs[0].slave = sc->bus_addr;
  132         data[0] = reg;
  133         data[1] = val;
  134 
  135         rv = iicbus_transfer_excl(sc->dev, msgs, 1, IIC_INTRWAIT);
  136         if (rv != 0) {
  137                 device_printf(sc->dev,
  138                     "Error when writing reg 0x%02X, rv: %d\n", reg, rv);
  139                 return (EIO);
  140         }
  141         return (0);
  142 }
  143 
  144 int act8846_write_buf(struct act8846_softc *sc, uint8_t reg, uint8_t *buf,
  145     size_t size)
  146 {
  147         uint8_t data[1];
  148         int rv;
  149         struct iic_msg msgs[2] = {
  150                 {0, IIC_M_WR, 1, data},
  151                 {0, IIC_M_WR | IIC_M_NOSTART, size, buf},
  152         };
  153 
  154         msgs[0].slave = sc->bus_addr;
  155         msgs[1].slave = sc->bus_addr;
  156         data[0] = reg;
  157 
  158         rv = iicbus_transfer_excl(sc->dev, msgs, 2, IIC_INTRWAIT);
  159         if (rv != 0) {
  160                 device_printf(sc->dev,
  161                     "Error when writing reg 0x%02X, rv: %d\n", reg, rv);
  162                 return (EIO);
  163         }
  164         return (0);
  165 }
  166 
  167 int
  168 act8846_modify(struct act8846_softc *sc, uint8_t reg, uint8_t clear, uint8_t set)
  169 {
  170         uint8_t val;
  171         int rv;
  172 
  173         rv = act8846_read(sc, reg, &val);
  174         if (rv != 0)
  175                 return (rv);
  176 
  177         val &= ~clear;
  178         val |= set;
  179 
  180         rv = act8846_write(sc, reg, val);
  181         if (rv != 0)
  182                 return (rv);
  183 
  184         return (0);
  185 }
  186 
  187 static int
  188 act8846_probe(device_t dev)
  189 {
  190 
  191         if (!ofw_bus_status_okay(dev))
  192                 return (ENXIO);
  193 
  194         if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
  195                 return (ENXIO);
  196 
  197         device_set_desc(dev, "ACT8846 PMIC");
  198         return (BUS_PROBE_DEFAULT);
  199 }
  200 
  201 static int
  202 act8846_attach(device_t dev)
  203 {
  204         struct act8846_softc *sc;
  205         int rv;
  206         phandle_t node;
  207 
  208         sc = device_get_softc(dev);
  209         sc->dev = dev;
  210         sc->bus_addr = iicbus_get_addr(dev);
  211         node = ofw_bus_get_node(sc->dev);
  212         rv = 0;
  213         LOCK_INIT(sc);
  214 
  215 
  216         rv = act8846_regulator_attach(sc, node);
  217         if (rv != 0)
  218                 goto fail;
  219 
  220         return (bus_generic_attach(dev));
  221 
  222 fail:
  223         LOCK_DESTROY(sc);
  224         return (rv);
  225 }
  226 
  227 static int
  228 act8846_detach(device_t dev)
  229 {
  230         struct act8846_softc *sc;
  231 
  232         sc = device_get_softc(dev);
  233         LOCK_DESTROY(sc);
  234 
  235         return (bus_generic_detach(dev));
  236 }
  237 
  238 static device_method_t act8846_methods[] = {
  239         /* Device interface */
  240         DEVMETHOD(device_probe,         act8846_probe),
  241         DEVMETHOD(device_attach,        act8846_attach),
  242         DEVMETHOD(device_detach,        act8846_detach),
  243 
  244         /* Regdev interface */
  245         DEVMETHOD(regdev_map,           act8846_regulator_map),
  246 
  247         DEVMETHOD_END
  248 };
  249 
  250 static DEFINE_CLASS_0(act8846_pmu, act8846_driver, act8846_methods,
  251     sizeof(struct act8846_softc));
  252 EARLY_DRIVER_MODULE(act8846_pmic, iicbus, act8846_driver,
  253     NULL, NULL, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LAST);
  254 MODULE_VERSION(act8846_pmic, 1);
  255 MODULE_DEPEND(act8846_pmic, iicbus, IICBUS_MINVER, IICBUS_PREFVER,
  256     IICBUS_MAXVER);
  257 IICBUS_FDT_PNP_INFO(compat_data);

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FreeBSD/Linux Kernel Cross Reference sys/dev/iicbus/pmic/act8846.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/pmic/act8846.c