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  * $FreeBSD: src/sys/dev/acpica/acpi_acad.c,v 1.39 2009/06/05 18:44:36 jkim Exp
   27  */
   28 
   29 #include "opt_acpi.h"
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/bus.h>
   33 
   34 #include <sys/rman.h>
   35 #include <sys/malloc.h>
   36 #include <sys/module.h>
   37 #include <sys/conf.h>
   38 #include <sys/power.h>
   39 
   40 #include "acpi.h"
   41 
   42 #include <dev/acpica/acpivar.h>
   43 #include <dev/acpica/acpiio.h>
   44 #include <bus/isa/isavar.h>
   45 #include <bus/isa/pnpvar.h>
   46  
   47 /* Hooks for the ACPI CA debugging infrastructure */
   48 #define _COMPONENT      ACPI_AC_ADAPTER
   49 ACPI_MODULE_NAME("AC_ADAPTER")
   50 
   51 /* Number of times to retry initialization before giving up. */
   52 #define ACPI_ACAD_RETRY_MAX             6
   53 
   54 #define ACPI_POWERSOURCE_STAT_CHANGE    0x80
   55 
   56 struct  acpi_acad_softc {
   57     int status;
   58 };
   59 
   60 static void     acpi_acad_get_status(void *);
   61 static void     acpi_acad_notify_handler(ACPI_HANDLE, UINT32, void *);
   62 static int      acpi_acad_probe(device_t);
   63 static int      acpi_acad_attach(device_t);
   64 static int      acpi_acad_ioctl(u_long, caddr_t, void *);
   65 static int      acpi_acad_sysctl(SYSCTL_HANDLER_ARGS);
   66 static void     acpi_acad_init_acline(void *arg);
   67 static void     acpi_acad_ac_only(void *arg);
   68 
   69 static device_method_t acpi_acad_methods[] = {
   70     /* Device interface */
   71     DEVMETHOD(device_probe,     acpi_acad_probe),
   72     DEVMETHOD(device_attach,    acpi_acad_attach),
   73 
   74     DEVMETHOD_END
   75 };
   76 
   77 static driver_t acpi_acad_driver = {
   78     "acpi_acad",
   79     acpi_acad_methods,
   80     sizeof(struct acpi_acad_softc),
   81 };
   82 
   83 static devclass_t acpi_acad_devclass;
   84 DRIVER_MODULE(acpi_acad, acpi, acpi_acad_driver, acpi_acad_devclass, NULL, NULL);
   85 MODULE_DEPEND(acpi_acad, acpi, 1, 1, 1);
   86 
   87 ACPI_SERIAL_DECL(acad, "ACPI AC adapter");
   88 
   89 SYSINIT(acad, SI_SUB_KTHREAD_IDLE, SI_ORDER_FIRST, acpi_acad_ac_only, NULL);
   90 
   91 static void
   92 acpi_acad_get_status(void *context)
   93 {
   94     struct acpi_acad_softc *sc;
   95     device_t    dev;
   96     ACPI_HANDLE h;
   97     int         newstatus;
   98 
   99     dev = context;
  100     sc = device_get_softc(dev);
  101     h = acpi_get_handle(dev);
  102     newstatus = -1;
  103     acpi_GetInteger(h, "_PSR", &newstatus);
  104 
  105     /* If status is valid and has changed, notify the system. */
  106     ACPI_SERIAL_BEGIN(acad);
  107     if (newstatus != -1 && sc->status != newstatus) {
  108         sc->status = newstatus;
  109         power_profile_set_state(newstatus ? POWER_PROFILE_PERFORMANCE :
  110             POWER_PROFILE_ECONOMY);
  111         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  112             "%s Line\n", newstatus ? "On" : "Off");
  113         acpi_UserNotify("ACAD", h, newstatus);
  114     }
  115     ACPI_SERIAL_END(acad);
  116 }
  117 
  118 static void
  119 acpi_acad_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
  120 {
  121     device_t dev;
  122 
  123     dev = (device_t)context;
  124     switch (notify) {
  125     case ACPI_NOTIFY_BUS_CHECK:
  126     case ACPI_NOTIFY_DEVICE_CHECK:
  127     case ACPI_POWERSOURCE_STAT_CHANGE:
  128         /* Temporarily.  It is better to notify policy manager */
  129         AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_acad_get_status, context);
  130         break;
  131     default:
  132         device_printf(dev, "unknown notify %#x\n", notify);
  133         break;
  134     }
  135 }
  136 
  137 static int
  138 acpi_acad_probe(device_t dev)
  139 {
  140     static char *acad_ids[] = { "ACPI0003", NULL };
  141 
  142     if (acpi_disabled("acad") ||
  143         ACPI_ID_PROBE(device_get_parent(dev), dev, acad_ids) == NULL)
  144         return (ENXIO);
  145 
  146     device_set_desc(dev, "AC Adapter");
  147     return (0);
  148 }
  149 
  150 static int
  151 acpi_acad_attach(device_t dev)
  152 {
  153     struct acpi_acad_softc *sc;
  154     struct acpi_softc      *acpi_sc;
  155     ACPI_HANDLE handle;
  156     int         error;
  157 
  158     sc = device_get_softc(dev);
  159     handle = acpi_get_handle(dev);
  160 
  161     error = acpi_register_ioctl(ACPIIO_ACAD_GET_STATUS, acpi_acad_ioctl, dev);
  162     if (error != 0)
  163         return (error);
  164 
  165     ACPI_SERIAL_INIT(acad);
  166 
  167     if (device_get_unit(dev) == 0) {
  168         acpi_sc = acpi_device_get_parent_softc(dev);
  169         SYSCTL_ADD_PROC(&acpi_sc->acpi_sysctl_ctx,
  170                         SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
  171                         OID_AUTO, "acline", CTLTYPE_INT | CTLFLAG_RD,
  172                         &sc->status, 0, acpi_acad_sysctl, "I", "");
  173     }
  174 
  175     /* Get initial status after whole system is up. */
  176     sc->status = -1;
  177 
  178     /*
  179      * Install both system and device notify handlers since the Casio
  180      * FIVA needs them.
  181      */
  182     AcpiInstallNotifyHandler(handle, ACPI_ALL_NOTIFY,
  183                              acpi_acad_notify_handler, dev);
  184     AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_acad_init_acline, dev);
  185 
  186     return (0);
  187 }
  188 
  189 static int
  190 acpi_acad_ioctl(u_long cmd, caddr_t addr, void *arg)
  191 {
  192     struct acpi_acad_softc *sc;
  193     device_t dev;
  194 
  195     dev = (device_t)arg;
  196     sc = device_get_softc(dev);
  197 
  198     /*
  199      * No security check required: information retrieval only.  If
  200      * new functions are added here, a check might be required.
  201      */
  202     switch (cmd) {
  203     case ACPIIO_ACAD_GET_STATUS:
  204         acpi_acad_get_status(dev);
  205         *(int *)addr = sc->status;
  206         break;
  207     default:
  208         break;
  209     }
  210 
  211     return (0);
  212 }
  213 
  214 static int
  215 acpi_acad_sysctl(SYSCTL_HANDLER_ARGS)
  216 {
  217     int val, error;
  218 
  219     if (acpi_acad_get_acline(&val) != 0)
  220         return (ENXIO);
  221 
  222     val = *(u_int *)oidp->oid_arg1;
  223     error = sysctl_handle_int(oidp, &val, 0, req);
  224     return (error);
  225 }
  226 
  227 static void
  228 acpi_acad_init_acline(void *arg)
  229 {
  230     struct acpi_acad_softc *sc;
  231     device_t    dev;
  232     int         retry;
  233 
  234     dev = (device_t)arg;
  235     sc = device_get_softc(dev);
  236     ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  237                 "acline initialization start\n");
  238 
  239     for (retry = 0; retry < ACPI_ACAD_RETRY_MAX; retry++) {
  240         acpi_acad_get_status(dev);
  241         if (sc->status != -1)
  242             break;
  243         AcpiOsSleep(10000);
  244     }
  245 
  246     ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  247                 "acline initialization done, tried %d times\n", retry + 1);
  248 }
  249 
  250 /*
  251  * If no AC line devices detected after boot, create an "online" event
  252  * so that userland code can adjust power settings accordingly.  The default
  253  * power profile is "performance" so we don't need to repeat that here.
  254  */
  255 static void
  256 acpi_acad_ac_only(void __unused *arg)
  257 {
  258 
  259     if (devclass_get_count(acpi_acad_devclass) == 0)
  260         acpi_UserNotify("ACAD", ACPI_ROOT_OBJECT, 1);
  261 }
  262 
  263 /*
  264  * Public interfaces.
  265  */
  266 int
  267 acpi_acad_get_acline(int *status)
  268 {
  269     struct acpi_acad_softc *sc;
  270     device_t dev;
  271 
  272     dev = devclass_get_device(acpi_acad_devclass, 0);
  273     if (dev == NULL)
  274         return (ENXIO);
  275     sc = device_get_softc(dev);
  276 
  277     acpi_acad_get_status(dev);
  278     *status = sc->status;
  279 
  280     return (0);
  281 }

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