The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_acad.c

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    1 /*-
    2  * Copyright (c) 2000 Takanori Watanabe
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/12.0/sys/dev/acpica/acpi_acad.c 246128 2013-01-30 18:01:20Z sbz $");
   29 
   30 #include "opt_acpi.h"
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/bus.h>
   34 
   35 #include <machine/bus.h>
   36 #include <sys/rman.h>
   37 #include <sys/ioccom.h>
   38 #include <sys/malloc.h>
   39 #include <sys/module.h>
   40 #include <sys/conf.h>
   41 #include <sys/power.h>
   42 
   43 #include <contrib/dev/acpica/include/acpi.h>
   44 
   45 #include <dev/acpica/acpivar.h>
   46 #include <dev/acpica/acpiio.h>
   47 #include <isa/isavar.h>
   48 #include <isa/pnpvar.h>
   49  
   50 /* Hooks for the ACPI CA debugging infrastructure */
   51 #define _COMPONENT      ACPI_AC_ADAPTER
   52 ACPI_MODULE_NAME("AC_ADAPTER")
   53 
   54 /* Number of times to retry initialization before giving up. */
   55 #define ACPI_ACAD_RETRY_MAX             6
   56 
   57 #define ACPI_POWERSOURCE_STAT_CHANGE    0x80
   58 
   59 struct  acpi_acad_softc {
   60     int status;
   61 };
   62 
   63 static void     acpi_acad_get_status(void *);
   64 static void     acpi_acad_notify_handler(ACPI_HANDLE, UINT32, void *);
   65 static int      acpi_acad_probe(device_t);
   66 static int      acpi_acad_attach(device_t);
   67 static int      acpi_acad_ioctl(u_long, caddr_t, void *);
   68 static int      acpi_acad_sysctl(SYSCTL_HANDLER_ARGS);
   69 static void     acpi_acad_init_acline(void *arg);
   70 static void     acpi_acad_ac_only(void *arg);
   71 
   72 static device_method_t acpi_acad_methods[] = {
   73     /* Device interface */
   74     DEVMETHOD(device_probe,     acpi_acad_probe),
   75     DEVMETHOD(device_attach,    acpi_acad_attach),
   76 
   77     DEVMETHOD_END
   78 };
   79 
   80 static driver_t acpi_acad_driver = {
   81     "acpi_acad",
   82     acpi_acad_methods,
   83     sizeof(struct acpi_acad_softc),
   84 };
   85 
   86 static devclass_t acpi_acad_devclass;
   87 DRIVER_MODULE(acpi_acad, acpi, acpi_acad_driver, acpi_acad_devclass, 0, 0);
   88 MODULE_DEPEND(acpi_acad, acpi, 1, 1, 1);
   89 
   90 ACPI_SERIAL_DECL(acad, "ACPI AC adapter");
   91 
   92 SYSINIT(acad, SI_SUB_KTHREAD_IDLE, SI_ORDER_FIRST, acpi_acad_ac_only, NULL);
   93 
   94 static void
   95 acpi_acad_get_status(void *context)
   96 {
   97     struct acpi_acad_softc *sc;
   98     device_t    dev;
   99     ACPI_HANDLE h;
  100     int         newstatus;
  101 
  102     dev = context;
  103     sc = device_get_softc(dev);
  104     h = acpi_get_handle(dev);
  105     newstatus = -1;
  106     acpi_GetInteger(h, "_PSR", &newstatus);
  107 
  108     /* If status is valid and has changed, notify the system. */
  109     ACPI_SERIAL_BEGIN(acad);
  110     if (newstatus != -1 && sc->status != newstatus) {
  111         sc->status = newstatus;
  112         ACPI_SERIAL_END(acad);
  113         power_profile_set_state(newstatus ? POWER_PROFILE_PERFORMANCE :
  114             POWER_PROFILE_ECONOMY);
  115         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  116             "%s Line\n", newstatus ? "On" : "Off");
  117         acpi_UserNotify("ACAD", h, newstatus);
  118     } else
  119         ACPI_SERIAL_END(acad);
  120 }
  121 
  122 static void
  123 acpi_acad_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
  124 {
  125     device_t dev;
  126 
  127     dev = (device_t)context;
  128     switch (notify) {
  129     case ACPI_NOTIFY_BUS_CHECK:
  130     case ACPI_NOTIFY_DEVICE_CHECK:
  131     case ACPI_POWERSOURCE_STAT_CHANGE:
  132         /* Temporarily.  It is better to notify policy manager */
  133         AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_acad_get_status, context);
  134         break;
  135     default:
  136         device_printf(dev, "unknown notify %#x\n", notify);
  137         break;
  138     }
  139 }
  140 
  141 static int
  142 acpi_acad_probe(device_t dev)
  143 {
  144     static char *acad_ids[] = { "ACPI0003", NULL };
  145 
  146     if (acpi_disabled("acad") ||
  147         ACPI_ID_PROBE(device_get_parent(dev), dev, acad_ids) == NULL)
  148         return (ENXIO);
  149 
  150     device_set_desc(dev, "AC Adapter");
  151     return (0);
  152 }
  153 
  154 static int
  155 acpi_acad_attach(device_t dev)
  156 {
  157     struct acpi_acad_softc *sc;
  158     struct acpi_softc      *acpi_sc;
  159     ACPI_HANDLE handle;
  160     int         error;
  161 
  162     sc = device_get_softc(dev);
  163     handle = acpi_get_handle(dev);
  164 
  165     error = acpi_register_ioctl(ACPIIO_ACAD_GET_STATUS, acpi_acad_ioctl, dev);
  166     if (error != 0)
  167         return (error);
  168 
  169     if (device_get_unit(dev) == 0) {
  170         acpi_sc = acpi_device_get_parent_softc(dev);
  171         SYSCTL_ADD_PROC(&acpi_sc->acpi_sysctl_ctx,
  172                         SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
  173                         OID_AUTO, "acline", CTLTYPE_INT | CTLFLAG_RD,
  174                         &sc->status, 0, acpi_acad_sysctl, "I", "");
  175     }
  176 
  177     /* Get initial status after whole system is up. */
  178     sc->status = -1;
  179 
  180     /*
  181      * Install both system and device notify handlers since the Casio
  182      * FIVA needs them.
  183      */
  184     AcpiInstallNotifyHandler(handle, ACPI_ALL_NOTIFY,
  185                              acpi_acad_notify_handler, dev);
  186     AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_acad_init_acline, dev);
  187 
  188     return (0);
  189 }
  190 
  191 static int
  192 acpi_acad_ioctl(u_long cmd, caddr_t addr, void *arg)
  193 {
  194     struct acpi_acad_softc *sc;
  195     device_t dev;
  196 
  197     dev = (device_t)arg;
  198     sc = device_get_softc(dev);
  199 
  200     /*
  201      * No security check required: information retrieval only.  If
  202      * new functions are added here, a check might be required.
  203      */
  204     switch (cmd) {
  205     case ACPIIO_ACAD_GET_STATUS:
  206         acpi_acad_get_status(dev);
  207         *(int *)addr = sc->status;
  208         break;
  209     default:
  210         break;
  211     }
  212 
  213     return (0);
  214 }
  215 
  216 static int
  217 acpi_acad_sysctl(SYSCTL_HANDLER_ARGS)
  218 {
  219     int val, error;
  220 
  221     if (acpi_acad_get_acline(&val) != 0)
  222         return (ENXIO);
  223 
  224     val = *(u_int *)oidp->oid_arg1;
  225     error = sysctl_handle_int(oidp, &val, 0, req);
  226     return (error);
  227 }
  228 
  229 static void
  230 acpi_acad_init_acline(void *arg)
  231 {
  232     struct acpi_acad_softc *sc;
  233     device_t    dev;
  234     int         retry;
  235 
  236     dev = (device_t)arg;
  237     sc = device_get_softc(dev);
  238     ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  239                 "acline initialization start\n");
  240 
  241     for (retry = 0; retry < ACPI_ACAD_RETRY_MAX; retry++) {
  242         acpi_acad_get_status(dev);
  243         if (sc->status != -1)
  244             break;
  245         AcpiOsSleep(10000);
  246     }
  247 
  248     ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  249                 "acline initialization done, tried %d times\n", retry + 1);
  250 }
  251 
  252 /*
  253  * If no AC line devices detected after boot, create an "online" event
  254  * so that userland code can adjust power settings accordingly.  The default
  255  * power profile is "performance" so we don't need to repeat that here.
  256  */
  257 static void
  258 acpi_acad_ac_only(void __unused *arg)
  259 {
  260 
  261     if (devclass_get_count(acpi_acad_devclass) == 0)
  262         acpi_UserNotify("ACAD", ACPI_ROOT_OBJECT, 1);
  263 }
  264 
  265 /*
  266  * Public interfaces.
  267  */
  268 int
  269 acpi_acad_get_acline(int *status)
  270 {
  271     struct acpi_acad_softc *sc;
  272     device_t dev;
  273 
  274     dev = devclass_get_device(acpi_acad_devclass, 0);
  275     if (dev == NULL)
  276         return (ENXIO);
  277     sc = device_get_softc(dev);
  278 
  279     acpi_acad_get_status(dev);
  280     *status = sc->status;
  281 
  282     return (0);
  283 }

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