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

     /*-
      * Copyright (c) 2000 Mitsaru IWASAKI <iwasaki@jp.freebsd.org>
      * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
      * Copyright (c) 2000 BSDi
      * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.4/sys/dev/acpica/acpi_button.c 246128 2013-01-30 18:01:20Z sbz $");
    
    #include "opt_acpi.h"
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    
    #include <contrib/dev/acpica/include/acpi.h>
    #include <contrib/dev/acpica/include/accommon.h>
    
    #include <dev/acpica/acpivar.h>
    
    /* Hooks for the ACPI CA debugging infrastructure */
    #define _COMPONENT      ACPI_BUTTON
    ACPI_MODULE_NAME("BUTTON")
    
    struct acpi_button_softc {
        device_t    button_dev;
        ACPI_HANDLE button_handle;
        boolean_t   button_type;
    #define         ACPI_POWER_BUTTON       0
    #define         ACPI_SLEEP_BUTTON       1
        boolean_t   fixed;
    };
    
    #define         ACPI_NOTIFY_BUTTON_PRESSED_FOR_SLEEP    0x80
    #define         ACPI_NOTIFY_BUTTON_PRESSED_FOR_WAKEUP   0x02
    
    static int      acpi_button_probe(device_t dev);
    static int      acpi_button_attach(device_t dev);
    static int      acpi_button_suspend(device_t dev);
    static int      acpi_button_resume(device_t dev);
    static void     acpi_button_notify_handler(ACPI_HANDLE h, UINT32 notify,
                                               void *context);
    static ACPI_STATUS
                    acpi_button_fixed_handler(void *context);
    static void     acpi_button_notify_sleep(void *arg);
    static void     acpi_button_notify_wakeup(void *arg);
    
    static char *btn_ids[] = {
        "PNP0C0C", "ACPI_FPB", "PNP0C0E", "ACPI_FSB",
        NULL
    };
    
    static device_method_t acpi_button_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,     acpi_button_probe),
        DEVMETHOD(device_attach,    acpi_button_attach),
        DEVMETHOD(device_suspend,   acpi_button_suspend),
        DEVMETHOD(device_shutdown,  acpi_button_suspend),
        DEVMETHOD(device_resume,    acpi_button_resume),
        DEVMETHOD_END
    };
    
    static driver_t acpi_button_driver = {
        "acpi_button",
        acpi_button_methods,
        sizeof(struct acpi_button_softc),
    };
    
    static devclass_t acpi_button_devclass;
    DRIVER_MODULE(acpi_button, acpi, acpi_button_driver, acpi_button_devclass,
                  0, 0);
    MODULE_DEPEND(acpi_button, acpi, 1, 1, 1);
    
    static int
    acpi_button_probe(device_t dev)
    {
        struct acpi_button_softc *sc;
       char *str; 
   
       if (acpi_disabled("button") ||
           (str = ACPI_ID_PROBE(device_get_parent(dev), dev, btn_ids)) == NULL)
           return (ENXIO);
   
       sc = device_get_softc(dev);
       if (strcmp(str, "PNP0C0C") == 0) {
           device_set_desc(dev, "Power Button");
           sc->button_type = ACPI_POWER_BUTTON;
       } else if (strcmp(str, "ACPI_FPB") == 0) {
           device_set_desc(dev, "Power Button (fixed)");
           sc->button_type = ACPI_POWER_BUTTON;
           sc->fixed = 1;
       } else if (strcmp(str, "PNP0C0E") == 0) {
           device_set_desc(dev, "Sleep Button");
           sc->button_type = ACPI_SLEEP_BUTTON;
       } else if (strcmp(str, "ACPI_FSB") == 0) {
           device_set_desc(dev, "Sleep Button (fixed)");
           sc->button_type = ACPI_SLEEP_BUTTON;
           sc->fixed = 1;
       }
   
       return (0);
   }
   
   static int
   acpi_button_attach(device_t dev)
   {
       struct acpi_prw_data        prw;
       struct acpi_button_softc    *sc;
       ACPI_STATUS                 status;
       int event;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       sc = device_get_softc(dev);
       sc->button_dev = dev;
       sc->button_handle = acpi_get_handle(dev);
       event = (sc->button_type == ACPI_SLEEP_BUTTON) ?
               ACPI_EVENT_SLEEP_BUTTON : ACPI_EVENT_POWER_BUTTON;
   
       /* 
        * Install the new handler.  We could remove any fixed handlers added
        * from the FADT once we have a duplicate from the AML but some systems
        * only return events on one or the other so we have to keep both.
        */
       if (sc->fixed) {
           AcpiClearEvent(event);
           status = AcpiInstallFixedEventHandler(event,
                           acpi_button_fixed_handler, sc);
       } else {
           /*
            * If a system does not get lid events, it may make sense to change
            * the type to ACPI_ALL_NOTIFY.  Some systems generate both a wake
            * and runtime notify in that case though.
            */
           status = AcpiInstallNotifyHandler(sc->button_handle,
                           ACPI_DEVICE_NOTIFY, acpi_button_notify_handler, sc);
       }
       if (ACPI_FAILURE(status)) {
           device_printf(sc->button_dev, "couldn't install notify handler - %s\n",
                         AcpiFormatException(status));
           return_VALUE (ENXIO);
       }
   
       /* Enable the GPE for wake/runtime. */
       acpi_wake_set_enable(dev, 1);
       if (acpi_parse_prw(sc->button_handle, &prw) == 0)
           AcpiEnableGpe(prw.gpe_handle, prw.gpe_bit);
   
       return_VALUE (0);
   }
   
   static int
   acpi_button_suspend(device_t dev)
   {
       return (0);
   }
   
   static int
   acpi_button_resume(device_t dev)
   {
       return (0);
   }
   
   static void
   acpi_button_notify_sleep(void *arg)
   {
       struct acpi_button_softc    *sc;
       struct acpi_softc           *acpi_sc;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       sc = (struct acpi_button_softc *)arg;
       acpi_sc = acpi_device_get_parent_softc(sc->button_dev);
       if (acpi_sc == NULL)
           return_VOID;
   
       acpi_UserNotify("Button", sc->button_handle, sc->button_type);
   
       switch (sc->button_type) {
       case ACPI_POWER_BUTTON:
           ACPI_VPRINT(sc->button_dev, acpi_sc, "power button pressed\n");
           acpi_event_power_button_sleep(acpi_sc);
           break;
       case ACPI_SLEEP_BUTTON:
           ACPI_VPRINT(sc->button_dev, acpi_sc, "sleep button pressed\n");
           acpi_event_sleep_button_sleep(acpi_sc);
           break;
       default:
           break;          /* unknown button type */
       }
   }
   
   static void
   acpi_button_notify_wakeup(void *arg)
   {
       struct acpi_button_softc    *sc;
       struct acpi_softc           *acpi_sc;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       sc = (struct acpi_button_softc *)arg;
       acpi_sc = acpi_device_get_parent_softc(sc->button_dev);
       if (acpi_sc == NULL)
           return_VOID;
   
       acpi_UserNotify("Button", sc->button_handle, sc->button_type);
   
       switch (sc->button_type) {
       case ACPI_POWER_BUTTON:
           ACPI_VPRINT(sc->button_dev, acpi_sc, "wakeup by power button\n");
           acpi_event_power_button_wake(acpi_sc);
           break;
       case ACPI_SLEEP_BUTTON:
           ACPI_VPRINT(sc->button_dev, acpi_sc, "wakeup by sleep button\n");
           acpi_event_sleep_button_wake(acpi_sc);
           break;
       default:
           break;          /* unknown button type */
       }
   }
   
   static void 
   acpi_button_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
   {
       struct acpi_button_softc    *sc;
   
       ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, notify);
   
       sc = (struct acpi_button_softc *)context;
       switch (notify) {
       case ACPI_NOTIFY_BUTTON_PRESSED_FOR_SLEEP:
           AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_button_notify_sleep, sc);
           break;   
       case ACPI_NOTIFY_BUTTON_PRESSED_FOR_WAKEUP:
           AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_button_notify_wakeup, sc);
           break;   
       default:
           device_printf(sc->button_dev, "unknown notify %#x\n", notify);
           break;
       }
   }
   
   static ACPI_STATUS 
   acpi_button_fixed_handler(void *context)
   {
       struct acpi_button_softc    *sc = (struct acpi_button_softc *)context;
   
       ACPI_FUNCTION_TRACE_PTR((char *)(uintptr_t)__func__, context);
   
       if (context == NULL)
           return_ACPI_STATUS (AE_BAD_PARAMETER);
   
       acpi_button_notify_handler(sc->button_handle,
                                  ACPI_NOTIFY_BUTTON_PRESSED_FOR_SLEEP, sc);
       return_ACPI_STATUS (AE_OK);
   }

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