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/*-
* Copyright (c) 2009 Michael Gmelin <freebsd@grem.de>
* 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: release/9.1.0/sys/dev/acpi_support/acpi_wmi.c 229858 2012-01-09 15:56:33Z jh $");
/*
* Driver for acpi-wmi mapping, provides an interface for vendor specific
* implementations (e.g. HP and Acer laptops).
* Inspired by the ACPI-WMI mapping driver (c) 2008-2008 Carlos Corbacho which
* implements this functionality for Linux.
*
* WMI and ACPI: http://www.microsoft.com/whdc/system/pnppwr/wmi/wmi-acpi.mspx
* acpi-wmi for Linux: http://www.kernel.org
*/
#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/sbuf.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>
#include "acpi_wmi_if.h"
MALLOC_DEFINE(M_ACPIWMI, "acpiwmi", "ACPI-WMI mapping");
#define _COMPONENT ACPI_OEM
ACPI_MODULE_NAME("ACPI_WMI");
#define ACPI_WMI_REGFLAG_EXPENSIVE 0x1 /* GUID flag: Expensive operation */
#define ACPI_WMI_REGFLAG_METHOD 0x2 /* GUID flag: Method call */
#define ACPI_WMI_REGFLAG_STRING 0x4 /* GUID flag: String */
#define ACPI_WMI_REGFLAG_EVENT 0x8 /* GUID flag: Event */
/*
* acpi_wmi driver private structure
*/
struct acpi_wmi_softc {
device_t wmi_dev; /* wmi device id */
ACPI_HANDLE wmi_handle; /* handle of the PNP0C14 node */
device_t ec_dev; /* acpi_ec0 */
struct cdev *wmistat_dev_t; /* wmistat device handle */
struct sbuf wmistat_sbuf; /* sbuf for /dev/wmistat output */
pid_t wmistat_open_pid; /* pid operating on /dev/wmistat */
int wmistat_bufptr; /* /dev/wmistat ptr to buffer position */
};
/*
* Struct that holds information about
* about a single GUID entry in _WDG
*/
struct guid_info {
char guid[16]; /* 16 byte non human readable GUID */
char oid[2]; /* object id or event notify id (first byte) */
UINT8 max_instance; /* highest instance known for this GUID */
UINT8 flags; /* ACPI_WMI_REGFLAG_%s */
};
/* WExx event generation state (on/off) */
enum event_generation_state {
EVENT_GENERATION_ON = 1,
EVENT_GENERATION_OFF = 0
};
/*
* Information about one entry in _WDG.
* List of those is used to lookup information by GUID.
*/
struct wmi_info {
TAILQ_ENTRY(wmi_info) wmi_list;
struct guid_info ginfo; /* information on guid */
ACPI_NOTIFY_HANDLER event_handler;/* client provided event handler */
void *event_handler_user_data; /* ev handler cookie */
};
TAILQ_HEAD(wmi_info_list_head, wmi_info)
wmi_info_list = TAILQ_HEAD_INITIALIZER(wmi_info_list);
ACPI_SERIAL_DECL(acpi_wmi, "ACPI-WMI Mapping");
/* public interface - declaration */
/* standard device interface*/
static int acpi_wmi_probe(device_t dev);
static int acpi_wmi_attach(device_t dev);
static int acpi_wmi_detach(device_t dev);
/* see acpi_wmi_if.m */
static int acpi_wmi_provides_guid_string_method(device_t dev,
const char *guid_string);
static ACPI_STATUS acpi_wmi_evaluate_call_method(device_t dev,
const char *guid_string, UINT8 instance,
UINT32 method_id, const ACPI_BUFFER *in,
ACPI_BUFFER *out);
static ACPI_STATUS acpi_wmi_install_event_handler_method(device_t dev,
const char *guid_string, ACPI_NOTIFY_HANDLER handler,
void *data);
static ACPI_STATUS acpi_wmi_remove_event_handler_method(device_t dev,
const char *guid_string);
static ACPI_STATUS acpi_wmi_get_event_data_method(device_t dev,
UINT32 event_id, ACPI_BUFFER *out);
static ACPI_STATUS acpi_wmi_get_block_method(device_t dev,
const char *guid_string,
UINT8 instance, ACPI_BUFFER *out);
static ACPI_STATUS acpi_wmi_set_block_method(device_t dev,
const char *guid_string,
UINT8 instance, const ACPI_BUFFER *in);
/* private interface - declaration */
/* callbacks */
static void acpi_wmi_notify_handler(ACPI_HANDLE h, UINT32 notify,
void *context);
static ACPI_STATUS acpi_wmi_ec_handler(UINT32 function,
ACPI_PHYSICAL_ADDRESS address, UINT32 width,
UINT64 *value, void *context,
void *region_context);
/* helpers */
static ACPI_STATUS acpi_wmi_read_wdg_blocks(ACPI_HANDLE h);
static ACPI_STATUS acpi_wmi_toggle_we_event_generation(device_t dev,
struct wmi_info *winfo,
enum event_generation_state state);
static int acpi_wmi_guid_string_to_guid(const UINT8 *guid_string,
UINT8 *guid);
static struct wmi_info* acpi_wmi_lookup_wmi_info_by_guid_string(
const char *guid_string);
static d_open_t acpi_wmi_wmistat_open;
static d_close_t acpi_wmi_wmistat_close;
static d_read_t acpi_wmi_wmistat_read;
/* handler /dev/wmistat device */
static struct cdevsw wmistat_cdevsw = {
.d_version = D_VERSION,
.d_open = acpi_wmi_wmistat_open,
.d_close = acpi_wmi_wmistat_close,
.d_read = acpi_wmi_wmistat_read,
.d_name = "wmistat",
};
static device_method_t acpi_wmi_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, acpi_wmi_probe),
DEVMETHOD(device_attach, acpi_wmi_attach),
DEVMETHOD(device_detach, acpi_wmi_detach),
/* bus interface */
DEVMETHOD(bus_add_child, bus_generic_add_child),
/* acpi_wmi interface */
DEVMETHOD(acpi_wmi_provides_guid_string,
acpi_wmi_provides_guid_string_method),
DEVMETHOD(acpi_wmi_evaluate_call, acpi_wmi_evaluate_call_method),
DEVMETHOD(acpi_wmi_install_event_handler,
acpi_wmi_install_event_handler_method),
DEVMETHOD(acpi_wmi_remove_event_handler,
acpi_wmi_remove_event_handler_method),
DEVMETHOD(acpi_wmi_get_event_data, acpi_wmi_get_event_data_method),
DEVMETHOD(acpi_wmi_get_block, acpi_wmi_get_block_method),
DEVMETHOD(acpi_wmi_set_block, acpi_wmi_set_block_method),
DEVMETHOD_END
};
static driver_t acpi_wmi_driver = {
"acpi_wmi",
acpi_wmi_methods,
sizeof(struct acpi_wmi_softc),
};
static devclass_t acpi_wmi_devclass;
DRIVER_MODULE(acpi_wmi, acpi, acpi_wmi_driver, acpi_wmi_devclass, 0, 0);
MODULE_VERSION(acpi_wmi, 1);
MODULE_DEPEND(acpi_wmi, acpi, 1, 1, 1);
static char *wmi_ids[] = {"PNP0C14", NULL};
/*
* Probe for the PNP0C14 ACPI node
*/
static int
acpi_wmi_probe(device_t dev)
{
if (acpi_disabled("wmi") ||
ACPI_ID_PROBE(device_get_parent(dev), dev, wmi_ids) == NULL)
return (ENXIO);
device_set_desc(dev, "ACPI-WMI mapping");
return (0);
}
/*
* Attach the device by:
* - Looking for the first ACPI EC device
* - Install the notify handler
* - Install the EC address space handler
* - Look for the _WDG node and read GUID information blocks
*/
static int
acpi_wmi_attach(device_t dev)
{
struct acpi_wmi_softc *sc;
int ret;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = device_get_softc(dev);
ret = ENXIO;
ACPI_SERIAL_BEGIN(acpi_wmi);
sc->wmi_dev = dev;
sc->wmi_handle = acpi_get_handle(dev);
TAILQ_INIT(&wmi_info_list);
/* XXX Only works with one EC, but nearly all systems only have one. */
if ((sc->ec_dev = devclass_get_device(devclass_find("acpi_ec"), 0))
== NULL)
device_printf(dev, "cannot find EC device\n");
else if (ACPI_FAILURE((status = AcpiInstallNotifyHandler(sc->wmi_handle,
ACPI_DEVICE_NOTIFY, acpi_wmi_notify_handler, sc))))
device_printf(sc->wmi_dev, "couldn't install notify handler - %s\n",
AcpiFormatException(status));
else if (ACPI_FAILURE((status = AcpiInstallAddressSpaceHandler(
sc->wmi_handle, ACPI_ADR_SPACE_EC, acpi_wmi_ec_handler,
NULL, sc)))) {
device_printf(sc->wmi_dev, "couldn't install EC handler - %s\n",
AcpiFormatException(status));
AcpiRemoveNotifyHandler(sc->wmi_handle, ACPI_DEVICE_NOTIFY,
acpi_wmi_notify_handler);
} else if (ACPI_FAILURE((status = acpi_wmi_read_wdg_blocks(
sc->wmi_handle)))) {
device_printf(sc->wmi_dev, "couldn't parse _WDG - %s\n",
AcpiFormatException(status));
AcpiRemoveNotifyHandler(sc->wmi_handle, ACPI_DEVICE_NOTIFY,
acpi_wmi_notify_handler);
AcpiRemoveAddressSpaceHandler(sc->wmi_handle, ACPI_ADR_SPACE_EC,
acpi_wmi_ec_handler);
} else {
sc->wmistat_dev_t = make_dev(&wmistat_cdevsw, 0, UID_ROOT,
GID_WHEEL, 0644, "wmistat%d", device_get_unit(dev));
sc->wmistat_dev_t->si_drv1 = sc;
sc->wmistat_open_pid = 0;
sc->wmistat_bufptr = -1;
ret = 0;
}
ACPI_SERIAL_END(acpi_wmi);
if (ret == 0) {
bus_generic_probe(dev);
ret = bus_generic_attach(dev);
}
return (ret);
}
/*
* Detach the driver by:
* - Removing notification handler
* - Removing address space handler
* - Turning off event generation for all WExx event activated by
* child drivers
*/
static int
acpi_wmi_detach(device_t dev)
{
struct wmi_info *winfo, *tmp;
struct acpi_wmi_softc *sc;
int ret;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = device_get_softc(dev);
ACPI_SERIAL_BEGIN(acpi_wmi);
if (sc->wmistat_open_pid != 0) {
ret = EBUSY;
} else {
AcpiRemoveNotifyHandler(sc->wmi_handle, ACPI_DEVICE_NOTIFY,
acpi_wmi_notify_handler);
AcpiRemoveAddressSpaceHandler(sc->wmi_handle,
ACPI_ADR_SPACE_EC, acpi_wmi_ec_handler);
TAILQ_FOREACH_SAFE(winfo, &wmi_info_list, wmi_list, tmp) {
if (winfo->event_handler)
acpi_wmi_toggle_we_event_generation(dev,
winfo, EVENT_GENERATION_OFF);
TAILQ_REMOVE(&wmi_info_list, winfo, wmi_list);
free(winfo, M_ACPIWMI);
}
if (sc->wmistat_bufptr != -1) {
sbuf_delete(&sc->wmistat_sbuf);
sc->wmistat_bufptr = -1;
}
sc->wmistat_open_pid = 0;
destroy_dev(sc->wmistat_dev_t);
ret = 0;
}
ACPI_SERIAL_END(acpi_wmi);
return (ret);
}
/*
* Check if the given GUID string (human readable format
* AABBCCDD-EEFF-GGHH-IIJJ-KKLLMMNNOOPP)
* exists within _WDG
*/
static int
acpi_wmi_provides_guid_string_method(device_t dev, const char *guid_string)
{
struct wmi_info *winfo;
int ret;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_SERIAL_BEGIN(acpi_wmi);
winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string);
ret = (winfo == NULL)?0:winfo->ginfo.max_instance+1;
ACPI_SERIAL_END(acpi_wmi);
return (ret);
}
/*
* Call a method "method_id" on the given GUID block
* write result into user provided output buffer
*/
static ACPI_STATUS
acpi_wmi_evaluate_call_method(device_t dev, const char *guid_string,
UINT8 instance, UINT32 method_id, const ACPI_BUFFER *in, ACPI_BUFFER *out)
{
ACPI_OBJECT params[3];
ACPI_OBJECT_LIST input;
char method[5] = "WMxx";
struct wmi_info *winfo;
struct acpi_wmi_softc *sc;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = device_get_softc(dev);
ACPI_SERIAL_BEGIN(acpi_wmi);
if ((winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string))
== NULL)
status = AE_NOT_FOUND;
else if (!(winfo->ginfo.flags & ACPI_WMI_REGFLAG_METHOD))
status = AE_BAD_DATA;
else if (instance > winfo->ginfo.max_instance)
status = AE_BAD_PARAMETER;
else {
params[0].Type = ACPI_TYPE_INTEGER;
params[0].Integer.Value = instance;
params[1].Type = ACPI_TYPE_INTEGER;
params[1].Integer.Value = method_id;
input.Pointer = params;
input.Count = 2;
if (in) {
params[2].Type =
(winfo->ginfo.flags & ACPI_WMI_REGFLAG_STRING)
?ACPI_TYPE_STRING:ACPI_TYPE_BUFFER;
params[2].Buffer.Length = in->Length;
params[2].Buffer.Pointer = in->Pointer;
input.Count = 3;
}
method[2] = winfo->ginfo.oid[0];
method[3] = winfo->ginfo.oid[1];
status = AcpiEvaluateObject(sc->wmi_handle, method,
&input, out);
}
ACPI_SERIAL_END(acpi_wmi);
return (status);
}
/*
* Install a user provided event_handler on the given GUID
* provided *data will be passed on callback
* If there is already an existing event handler registered it will be silently
* discarded
*/
static ACPI_STATUS
acpi_wmi_install_event_handler_method(device_t dev, const char *guid_string,
ACPI_NOTIFY_HANDLER event_handler, void *data)
{
struct wmi_info *winfo;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
status = AE_OK;
ACPI_SERIAL_BEGIN(acpi_wmi);
if (guid_string == NULL || event_handler == NULL)
status = AE_BAD_PARAMETER;
else if ((winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string))
== NULL)
status = AE_NOT_EXIST;
else if (winfo->event_handler != NULL ||
(status = acpi_wmi_toggle_we_event_generation(dev, winfo,
EVENT_GENERATION_ON)) == AE_OK) {
winfo->event_handler = event_handler;
winfo->event_handler_user_data = data;
}
ACPI_SERIAL_END(acpi_wmi);
return (status);
}
/*
* Remove a previously installed event handler from the given GUID
* If there was none installed, this call is silently discarded and
* reported as AE_OK
*/
static ACPI_STATUS
acpi_wmi_remove_event_handler_method(device_t dev, const char *guid_string)
{
struct wmi_info *winfo;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
status = AE_OK;
ACPI_SERIAL_BEGIN(acpi_wmi);
if (guid_string &&
(winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string))
!= NULL && winfo->event_handler) {
status = acpi_wmi_toggle_we_event_generation(dev, winfo,
EVENT_GENERATION_OFF);
winfo->event_handler = NULL;
winfo->event_handler_user_data = NULL;
}
ACPI_SERIAL_END(acpi_wmi);
return (status);
}
/*
* Get details on an event received through a callback registered
* through ACPI_WMI_REMOVE_EVENT_HANDLER into a user provided output buffer.
* (event_id equals "notify" passed in the callback)
*/
static ACPI_STATUS
acpi_wmi_get_event_data_method(device_t dev, UINT32 event_id, ACPI_BUFFER *out)
{
ACPI_OBJECT_LIST input;
ACPI_OBJECT params[1];
struct acpi_wmi_softc *sc;
struct wmi_info *winfo;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = device_get_softc(dev);
status = AE_NOT_FOUND;
ACPI_SERIAL_BEGIN(acpi_wmi);
params[0].Type = ACPI_TYPE_INTEGER;
params[0].Integer.Value = event_id;
input.Pointer = params;
input.Count = 1;
TAILQ_FOREACH(winfo, &wmi_info_list, wmi_list) {
if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EVENT) &&
((UINT8) winfo->ginfo.oid[0] == event_id)) {
status = AcpiEvaluateObject(sc->wmi_handle, "_WED",
&input, out);
break;
}
}
ACPI_SERIAL_END(acpi_wmi);
return (status);
}
/*
* Read a block of data from the given GUID (using WQxx (query))
* Will be returned in a user provided buffer (out).
* If the method is marked as expensive (ACPI_WMI_REGFLAG_EXPENSIVE)
* we will first call the WCxx control method to lock the node to
* lock the node for data collection and release it afterwards.
* (Failed WCxx calls are ignored to "support" broken implementations)
*/
static ACPI_STATUS
acpi_wmi_get_block_method(device_t dev, const char *guid_string, UINT8 instance,
ACPI_BUFFER *out)
{
char wc_method[5] = "WCxx";
char wq_method[5] = "WQxx";
ACPI_OBJECT_LIST wc_input;
ACPI_OBJECT_LIST wq_input;
ACPI_OBJECT wc_params[1];
ACPI_OBJECT wq_params[1];
ACPI_HANDLE wc_handle;
struct acpi_wmi_softc *sc;
struct wmi_info *winfo;
ACPI_STATUS status;
ACPI_STATUS wc_status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = device_get_softc(dev);
wc_status = AE_ERROR;
ACPI_SERIAL_BEGIN(acpi_wmi);
if (guid_string == NULL || out == NULL)
status = AE_BAD_PARAMETER;
else if ((winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string))
== NULL)
status = AE_ERROR;
else if (instance > winfo->ginfo.max_instance)
status = AE_BAD_PARAMETER;
else if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EVENT) ||
(winfo->ginfo.flags & ACPI_WMI_REGFLAG_METHOD))
status = AE_ERROR;
else {
wq_params[0].Type = ACPI_TYPE_INTEGER;
wq_params[0].Integer.Value = instance;
wq_input.Pointer = wq_params;
wq_input.Count = 1;
if (winfo->ginfo.flags & ACPI_WMI_REGFLAG_EXPENSIVE) {
wc_params[0].Type = ACPI_TYPE_INTEGER;
wc_params[0].Integer.Value = 1;
wc_input.Pointer = wc_params;
wc_input.Count = 1;
wc_method[2] = winfo->ginfo.oid[0];
wc_method[3] = winfo->ginfo.oid[1];
wc_status = AcpiGetHandle(sc->wmi_handle, wc_method,
&wc_handle);
if (ACPI_SUCCESS(wc_status))
wc_status = AcpiEvaluateObject(wc_handle,
wc_method, &wc_input, NULL);
}
wq_method[2] = winfo->ginfo.oid[0];
wq_method[3] = winfo->ginfo.oid[1];
status = AcpiEvaluateObject(sc->wmi_handle, wq_method,
&wq_input, out);
if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EXPENSIVE)
&& ACPI_SUCCESS(wc_status)) {
wc_params[0].Integer.Value = 0;
status = AcpiEvaluateObject(wc_handle, wc_method,
&wc_input, NULL); /* XXX this might be
the wrong status to
return? */
}
}
ACPI_SERIAL_END(acpi_wmi);
return (status);
}
/*
* Write a block of data to the given GUID (using WSxx)
*/
static ACPI_STATUS
acpi_wmi_set_block_method(device_t dev, const char *guid_string, UINT8 instance,
const ACPI_BUFFER *in)
{
char method[5] = "WSxx";
ACPI_OBJECT_LIST input;
ACPI_OBJECT params[2];
struct wmi_info *winfo;
struct acpi_wmi_softc *sc;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = device_get_softc(dev);
ACPI_SERIAL_BEGIN(acpi_wmi);
if (guid_string == NULL || in == NULL)
status = AE_BAD_DATA;
else if ((winfo = acpi_wmi_lookup_wmi_info_by_guid_string(guid_string))
== NULL)
status = AE_ERROR;
else if (instance > winfo->ginfo.max_instance)
status = AE_BAD_PARAMETER;
else if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EVENT) ||
(winfo->ginfo.flags & ACPI_WMI_REGFLAG_METHOD))
status = AE_ERROR;
else {
params[0].Type = ACPI_TYPE_INTEGER;
params[0].Integer.Value = instance;
input.Pointer = params;
input.Count = 2;
params[1].Type = (winfo->ginfo.flags & ACPI_WMI_REGFLAG_STRING)
?ACPI_TYPE_STRING:ACPI_TYPE_BUFFER;
params[1].Buffer.Length = in->Length;
params[1].Buffer.Pointer = in->Pointer;
method[2] = winfo->ginfo.oid[0];
method[3] = winfo->ginfo.oid[1];
status = AcpiEvaluateObject(sc->wmi_handle, method,
&input, NULL);
}
ACPI_SERIAL_END(acpi_wmi);
return (status);
}
/*
* Handle events received and dispatch them to
* stakeholders that registered through ACPI_WMI_INSTALL_EVENT_HANDLER
*/
static void
acpi_wmi_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
{
ACPI_NOTIFY_HANDLER handler;
void *handler_data;
struct wmi_info *winfo;
ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, notify);
handler = NULL;
handler_data = NULL;
ACPI_SERIAL_BEGIN(acpi_wmi);
TAILQ_FOREACH(winfo, &wmi_info_list, wmi_list) {
if ((winfo->ginfo.flags & ACPI_WMI_REGFLAG_EVENT) &&
((UINT8) winfo->ginfo.oid[0] == notify)) {
if (winfo->event_handler) {
handler = winfo->event_handler;
handler_data = winfo->event_handler_user_data;
break;
}
}
}
ACPI_SERIAL_END(acpi_wmi);
if (handler) {
handler(h, notify, handler_data);
}
}
/*
* Handle EC address space notifications reveived on the WDG node
* (this mimics EcAddressSpaceHandler in acpi_ec.c)
*/
static ACPI_STATUS
acpi_wmi_ec_handler(UINT32 function, ACPI_PHYSICAL_ADDRESS address,
UINT32 width, UINT64 *value, void *context,
void *region_context)
{
struct acpi_wmi_softc *sc;
int i;
UINT64 ec_data;
UINT8 ec_addr;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, (UINT32)address);
sc = (struct acpi_wmi_softc *)context;
if (width % 8 != 0 || value == NULL || context == NULL)
return (AE_BAD_PARAMETER);
if (address + (width / 8) - 1 > 0xFF)
return (AE_BAD_ADDRESS);
if (function == ACPI_READ)
*value = 0;
ec_addr = address;
status = AE_ERROR;
for (i = 0; i < width; i += 8, ++ec_addr) {
switch (function) {
case ACPI_READ:
status = ACPI_EC_READ(sc->ec_dev, ec_addr, &ec_data, 1);
if (ACPI_SUCCESS(status))
*value |= ((UINT64)ec_data) << i;
break;
case ACPI_WRITE:
ec_data = (UINT8)((*value) >> i);
status = ACPI_EC_WRITE(sc->ec_dev, ec_addr, ec_data, 1);
break;
default:
device_printf(sc->wmi_dev,
"invalid acpi_wmi_ec_handler function %d\n",
function);
status = AE_BAD_PARAMETER;
break;
}
if (ACPI_FAILURE(status))
break;
}
return (status);
}
/*
* Read GUID blocks from the _WDG node
* into wmi_info_list.
*/
static ACPI_STATUS
acpi_wmi_read_wdg_blocks(ACPI_HANDLE h)
{
ACPI_BUFFER out = {ACPI_ALLOCATE_BUFFER, NULL};
struct guid_info *ginfo;
ACPI_OBJECT *obj;
struct wmi_info *winfo;
UINT32 i;
UINT32 wdg_block_count;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_SERIAL_ASSERT(acpi_wmi);
if (ACPI_FAILURE(status = AcpiEvaluateObject(h, "_WDG", NULL, &out)))
return (status);
obj = (ACPI_OBJECT*) out.Pointer;
wdg_block_count = obj->Buffer.Length / sizeof(struct guid_info);
if ((ginfo = malloc(obj->Buffer.Length, M_ACPIWMI, M_NOWAIT))
== NULL) {
AcpiOsFree(out.Pointer);
return (AE_NO_MEMORY);
}
memcpy(ginfo, obj->Buffer.Pointer, obj->Buffer.Length);
for (i = 0; i < wdg_block_count; ++i) {
if ((winfo = malloc(sizeof(struct wmi_info), M_ACPIWMI,
M_NOWAIT | M_ZERO)) == NULL) {
AcpiOsFree(out.Pointer);
free(ginfo, M_ACPIWMI);
return (AE_NO_MEMORY);
}
winfo->ginfo = ginfo[i];
TAILQ_INSERT_TAIL(&wmi_info_list, winfo, wmi_list);
}
AcpiOsFree(out.Pointer);
free(ginfo, M_ACPIWMI);
return (status);
}
/*
* Toggle event generation in for the given GUID (passed by winfo)
* Turn on to get notified (through acpi_wmi_notify_handler) if events happen
* on the given GUID.
*/
static ACPI_STATUS
acpi_wmi_toggle_we_event_generation(device_t dev, struct wmi_info *winfo,
enum event_generation_state state)
{
char method[5] = "WExx";
ACPI_OBJECT_LIST input;
ACPI_OBJECT params[1];
struct acpi_wmi_softc *sc;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = device_get_softc(dev);
ACPI_SERIAL_ASSERT(acpi_wmi);
params[0].Type = ACPI_TYPE_INTEGER;
params[0].Integer.Value = state==EVENT_GENERATION_ON?1:0;
input.Pointer = params;
input.Count = 1;
UINT8 hi = ((UINT8) winfo->ginfo.oid[0]) >> 4;
UINT8 lo = ((UINT8) winfo->ginfo.oid[0]) & 0xf;
method[2] = (hi > 9 ? hi + 55: hi + 48);
method[3] = (lo > 9 ? lo + 55: lo + 48);
status = AcpiEvaluateObject(sc->wmi_handle, method, &input, NULL);
if (status == AE_NOT_FOUND) status = AE_OK;
return (status);
}
/*
* Convert given two digit hex string (hexin) to an UINT8 referenced
* by byteout.
* Return != 0 if the was a problem (invalid input)
*/
static __inline int acpi_wmi_hex_to_int(const UINT8 *hexin, UINT8 *byteout)
{
unsigned int hi;
unsigned int lo;
hi = hexin[0];
lo = hexin[1];
if ('0' <= hi && hi <= '9')
hi -= '0';
else if ('A' <= hi && hi <= 'F')
hi -= ('A' - 10);
else if ('a' <= hi && hi <= 'f')
hi -= ('a' - 10);
else
return (1);
if ('0' <= lo && lo <= '9')
lo -= '0';
else if ('A' <= lo && lo <= 'F')
lo -= ('A' - 10);
else if ('a' <= lo && lo <= 'f')
lo -= ('a' - 10);
else
return (1);
*byteout = (hi << 4) + lo;
return (0);
}
/*
* Convert a human readable 36 character GUID into a 16byte
* machine readable one.
* The basic algorithm looks as follows:
* Input: AABBCCDD-EEFF-GGHH-IIJJ-KKLLMMNNOOPP
* Output: DCBAFEHGIJKLMNOP
* (AA BB CC etc. represent two digit hex numbers == bytes)
* Return != 0 if passed guid string is invalid
*/
static int
acpi_wmi_guid_string_to_guid(const UINT8 *guid_string, UINT8 *guid)
{
static const int mapping[20] = {3, 2, 1, 0, -1, 5, 4, -1, 7, 6, -1,
8, 9, -1, 10, 11, 12, 13, 14, 15};
int i;
for (i = 0; i < 20; ++i, ++guid_string) {
if (mapping[i] >= 0) {
if (acpi_wmi_hex_to_int(guid_string,
&guid[mapping[i]]))
return (-1);
++guid_string;
} else if (*guid_string != '-')
return (-1);
}
return (0);
}
/*
* Lookup a wmi_info structure in wmi_list based on a
* human readable GUID
* Return NULL if the GUID is unknown in the _WDG
*/
static struct wmi_info*
acpi_wmi_lookup_wmi_info_by_guid_string(const char *guid_string)
{
char guid[16];
struct wmi_info *winfo;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
ACPI_SERIAL_ASSERT(acpi_wmi);
if (!acpi_wmi_guid_string_to_guid(guid_string, guid)) {
TAILQ_FOREACH(winfo, &wmi_info_list, wmi_list) {
if (!memcmp(winfo->ginfo.guid, guid, 16)) {
return (winfo);
}
}
}
return (NULL);
}
/*
* open wmistat device
*/
static int
acpi_wmi_wmistat_open(struct cdev* dev, int flags, int mode, struct thread *td)
{
struct acpi_wmi_softc *sc;
int ret;
if (dev == NULL || dev->si_drv1 == NULL)
return (EBADF);
sc = dev->si_drv1;
ACPI_SERIAL_BEGIN(acpi_wmi);
if (sc->wmistat_open_pid != 0) {
ret = EBUSY;
}
else {
if (sbuf_new(&sc->wmistat_sbuf, NULL, 4096, SBUF_AUTOEXTEND)
== NULL) {
ret = ENXIO;
} else {
sc->wmistat_open_pid = td->td_proc->p_pid;
sc->wmistat_bufptr = 0;
ret = 0;
}
}
ACPI_SERIAL_END(acpi_wmi);
return (ret);
}
/*
* close wmistat device
*/
static int
acpi_wmi_wmistat_close(struct cdev* dev, int flags, int mode,
struct thread *td)
{
struct acpi_wmi_softc *sc;
int ret;
if (dev == NULL || dev->si_drv1 == NULL)
return (EBADF);
sc = dev->si_drv1;
ACPI_SERIAL_BEGIN(acpi_wmi);
if (sc->wmistat_open_pid == 0) {
ret = EBADF;
}
else {
if (sc->wmistat_bufptr != -1) {
sbuf_delete(&sc->wmistat_sbuf);
sc->wmistat_bufptr = -1;
}
sc->wmistat_open_pid = 0;
ret = 0;
}
ACPI_SERIAL_END(acpi_wmi);
return (ret);
}
/*
* Read from wmistat guid information
*/
static int
acpi_wmi_wmistat_read(struct cdev *dev, struct uio *buf, int flag)
{
struct acpi_wmi_softc *sc;
struct wmi_info *winfo;
int l;
int ret;
UINT8* guid;
if (dev == NULL || dev->si_drv1 == NULL)
return (EBADF);
sc = dev->si_drv1;
ACPI_SERIAL_BEGIN(acpi_wmi);
if (sc->wmistat_open_pid != buf->uio_td->td_proc->p_pid ||
sc->wmistat_bufptr == -1) {
ret = EBADF;
}
else {
if (!sbuf_done(&sc->wmistat_sbuf)) {
sbuf_printf(&sc->wmistat_sbuf, "GUID "
" INST EXPE METH STR "
"EVENT OID\n");
TAILQ_FOREACH(winfo, &wmi_info_list, wmi_list) {
guid = (UINT8*)winfo->ginfo.guid;
sbuf_printf(&sc->wmistat_sbuf,
"{%02X%02X%02X%02X-%02X%02X-"
"%02X%02X-%02X%02X-%02X%02X"
"%02X%02X%02X%02X} %3d %-5s",
guid[3], guid[2], guid[1], guid[0],
guid[5], guid[4],
guid[7], guid[6],
guid[8], guid[9],
guid[10], guid[11], guid[12],
guid[13], guid[14], guid[15],
winfo->ginfo.max_instance,
(winfo->ginfo.flags&
ACPI_WMI_REGFLAG_EXPENSIVE)?
"YES":"NO"
);
if (winfo->ginfo.flags&ACPI_WMI_REGFLAG_METHOD)
sbuf_printf(&sc->wmistat_sbuf,
"WM%c%c ",
winfo->ginfo.oid[0],
winfo->ginfo.oid[1]);
else
sbuf_printf(&sc->wmistat_sbuf, "NO ");
sbuf_printf(&sc->wmistat_sbuf, "%-4s",
(winfo->ginfo.flags&
ACPI_WMI_REGFLAG_STRING)?"YES":"NO"
);
if (winfo->ginfo.flags&ACPI_WMI_REGFLAG_EVENT)
sbuf_printf(&sc->wmistat_sbuf,
"0x%02X%s -\n",
(UINT8)winfo->ginfo.oid[0],
winfo->event_handler==NULL?
" ":"+");
else
sbuf_printf(&sc->wmistat_sbuf,
"NO %c%c\n",
winfo->ginfo.oid[0],
winfo->ginfo.oid[1]);
}
sbuf_finish(&sc->wmistat_sbuf);
}
if (sbuf_len(&sc->wmistat_sbuf) <= 0) {
sbuf_delete(&sc->wmistat_sbuf);
sc->wmistat_bufptr = -1;
sc->wmistat_open_pid = 0;
ret = ENOMEM;
} else {
l = min(buf->uio_resid, sbuf_len(&sc->wmistat_sbuf) -
sc->wmistat_bufptr);
ret = (l > 0)?uiomove(sbuf_data(&sc->wmistat_sbuf) +
sc->wmistat_bufptr, l, buf) : 0;
sc->wmistat_bufptr += l;
}
}
ACPI_SERIAL_END(acpi_wmi);
return (ret);
}