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linux-stable/drivers/acpi/ec.c
Luming Yu 45bea1555f [ACPI] Add "ec_polling" boot option 
EC burst mode benefits many machines, some of
them significantly.  However, our current
implementation fails on some machines such
as Rafael's Asus L5D.

This patch restores the alternative EC polling code,
which can be enabled at boot time via "ec_polling"

http://bugzilla.kernel.org/show_bug.cgi?id=4665

Signed-off-by: Luming Yu <luming.yu@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2005-07-29 18:15:25 -04:00

1720 lines
41 KiB
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/*
* acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
*
* Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/actypes.h>
#define _COMPONENT ACPI_EC_COMPONENT
ACPI_MODULE_NAME ("acpi_ec")
#define ACPI_EC_COMPONENT 0x00100000
#define ACPI_EC_CLASS "embedded_controller"
#define ACPI_EC_HID "PNP0C09"
#define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver"
#define ACPI_EC_DEVICE_NAME "Embedded Controller"
#define ACPI_EC_FILE_INFO "info"
#define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
#define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
#define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
#define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
#define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */
#define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */
#define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */
#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
#define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */
#define ACPI_EC_UDELAY_COUNT 1000 /* Wait 10ms max. during EC ops */
#define ACPI_EC_COMMAND_READ 0x80
#define ACPI_EC_COMMAND_WRITE 0x81
#define ACPI_EC_BURST_ENABLE 0x82
#define ACPI_EC_BURST_DISABLE 0x83
#define ACPI_EC_COMMAND_QUERY 0x84
#define EC_POLLING 0xFF
#define EC_BURST 0x00
static int acpi_ec_remove (struct acpi_device *device, int type);
static int acpi_ec_start (struct acpi_device *device);
static int acpi_ec_stop (struct acpi_device *device, int type);
static int acpi_ec_burst_add ( struct acpi_device *device);
static struct acpi_driver acpi_ec_driver = {
.name = ACPI_EC_DRIVER_NAME,
.class = ACPI_EC_CLASS,
.ids = ACPI_EC_HID,
.ops = {
.add = acpi_ec_burst_add,
.remove = acpi_ec_remove,
.start = acpi_ec_start,
.stop = acpi_ec_stop,
},
};
union acpi_ec {
struct {
u32 mode;
acpi_handle handle;
unsigned long uid;
unsigned long gpe_bit;
struct acpi_generic_address status_addr;
struct acpi_generic_address command_addr;
struct acpi_generic_address data_addr;
unsigned long global_lock;
} common;
struct {
u32 mode;
acpi_handle handle;
unsigned long uid;
unsigned long gpe_bit;
struct acpi_generic_address status_addr;
struct acpi_generic_address command_addr;
struct acpi_generic_address data_addr;
unsigned long global_lock;
unsigned int expect_event;
atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort*/
atomic_t pending_gpe;
struct semaphore sem;
wait_queue_head_t wait;
}burst;
struct {
u32 mode;
acpi_handle handle;
unsigned long uid;
unsigned long gpe_bit;
struct acpi_generic_address status_addr;
struct acpi_generic_address command_addr;
struct acpi_generic_address data_addr;
unsigned long global_lock;
spinlock_t lock;
}polling;
};
static int acpi_ec_polling_wait ( union acpi_ec *ec, u8 event);
static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event);
static int acpi_ec_polling_read ( union acpi_ec *ec, u8 address, u32 *data);
static int acpi_ec_burst_read( union acpi_ec *ec, u8 address, u32 *data);
static int acpi_ec_polling_write ( union acpi_ec *ec, u8 address, u8 data);
static int acpi_ec_burst_write ( union acpi_ec *ec, u8 address, u8 data);
static int acpi_ec_polling_query ( union acpi_ec *ec, u32 *data);
static int acpi_ec_burst_query ( union acpi_ec *ec, u32 *data);
static void acpi_ec_gpe_polling_query ( void *ec_cxt);
static void acpi_ec_gpe_burst_query ( void *ec_cxt);
static u32 acpi_ec_gpe_polling_handler ( void *data);
static u32 acpi_ec_gpe_burst_handler ( void *data);
static acpi_status __init
acpi_fake_ecdt_polling_callback (
acpi_handle handle,
u32 Level,
void *context,
void **retval);
static acpi_status __init
acpi_fake_ecdt_burst_callback (
acpi_handle handle,
u32 Level,
void *context,
void **retval);
static int __init
acpi_ec_polling_get_real_ecdt(void);
static int __init
acpi_ec_burst_get_real_ecdt(void);
/* If we find an EC via the ECDT, we need to keep a ptr to its context */
static union acpi_ec *ec_ecdt;
/* External interfaces use first EC only, so remember */
static struct acpi_device *first_ec;
static int acpi_ec_polling_mode;
/* --------------------------------------------------------------------------
Transaction Management
-------------------------------------------------------------------------- */
static inline u32 acpi_ec_read_status(union acpi_ec *ec)
{
u32 status = 0;
acpi_hw_low_level_read(8, &status, &ec->common.status_addr);
return status;
}
static int
acpi_ec_wait (
union acpi_ec *ec,
u8 event)
{
if (acpi_ec_polling_mode)
return acpi_ec_polling_wait (ec, event);
else
return acpi_ec_burst_wait (ec, event);
}
static int
acpi_ec_polling_wait (
union acpi_ec *ec,
u8 event)
{
u32 acpi_ec_status = 0;
u32 i = ACPI_EC_UDELAY_COUNT;
if (!ec)
return -EINVAL;
/* Poll the EC status register waiting for the event to occur. */
switch (event) {
case ACPI_EC_EVENT_OBF:
do {
acpi_hw_low_level_read(8, &acpi_ec_status, &ec->common.status_addr);
if (acpi_ec_status & ACPI_EC_FLAG_OBF)
return 0;
udelay(ACPI_EC_UDELAY);
} while (--i>0);
break;
case ACPI_EC_EVENT_IBE:
do {
acpi_hw_low_level_read(8, &acpi_ec_status, &ec->common.status_addr);
if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
return 0;
udelay(ACPI_EC_UDELAY);
} while (--i>0);
break;
default:
return -EINVAL;
}
return -ETIME;
}
static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_ec_wait");
ec->burst.expect_event = event;
smp_mb();
result = wait_event_interruptible_timeout(ec->burst.wait,
!ec->burst.expect_event,
msecs_to_jiffies(ACPI_EC_DELAY));
ec->burst.expect_event = 0;
smp_mb();
if (result < 0){
ACPI_DEBUG_PRINT((ACPI_DB_ERROR," result = %d ", result));
return_VALUE(result);
}
/*
* Verify that the event in question has actually happened by
* querying EC status. Do the check even if operation timed-out
* to make sure that we did not miss interrupt.
*/
switch (event) {
case ACPI_EC_EVENT_OBF:
if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
return_VALUE(0);
break;
case ACPI_EC_EVENT_IBE:
if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
return_VALUE(0);
break;
}
return_VALUE(-ETIME);
}
static int
acpi_ec_enter_burst_mode (
union acpi_ec *ec)
{
u32 tmp = 0;
int status = 0;
ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
status = acpi_ec_read_status(ec);
if (status != -EINVAL &&
!(status & ACPI_EC_FLAG_BURST)){
acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->common.command_addr);
status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
if (status){
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
return_VALUE(-EINVAL);
}
acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
if(tmp != 0x90 ) {/* Burst ACK byte*/
return_VALUE(-EINVAL);
}
}
atomic_set(&ec->burst.leaving_burst , 0);
return_VALUE(0);
}
static int
acpi_ec_leave_burst_mode (
union acpi_ec *ec)
{
int status =0;
ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
atomic_set(&ec->burst.leaving_burst , 1);
status = acpi_ec_read_status(ec);
if (status != -EINVAL &&
(status & ACPI_EC_FLAG_BURST)){
acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
if (status){
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->wait fail\n"));
return_VALUE(-EINVAL);
}
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
status = acpi_ec_read_status(ec);
}
return_VALUE(0);
}
static int
acpi_ec_read (
union acpi_ec *ec,
u8 address,
u32 *data)
{
if (acpi_ec_polling_mode)
return acpi_ec_polling_read(ec, address, data);
else
return acpi_ec_burst_read(ec, address, data);
}
static int
acpi_ec_write (
union acpi_ec *ec,
u8 address,
u8 data)
{
if (acpi_ec_polling_mode)
return acpi_ec_polling_write(ec, address, data);
else
return acpi_ec_burst_write(ec, address, data);
}
static int
acpi_ec_polling_read (
union acpi_ec *ec,
u8 address,
u32 *data)
{
acpi_status status = AE_OK;
int result = 0;
unsigned long flags = 0;
u32 glk = 0;
ACPI_FUNCTION_TRACE("acpi_ec_read");
if (!ec || !data)
return_VALUE(-EINVAL);
*data = 0;
if (ec->common.global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status))
return_VALUE(-ENODEV);
}
spin_lock_irqsave(&ec->polling.lock, flags);
acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->common.command_addr);
result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
if (result)
goto end;
acpi_hw_low_level_write(8, address, &ec->common.data_addr);
result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
if (result)
goto end;
acpi_hw_low_level_read(8, data, &ec->common.data_addr);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
*data, address));
end:
spin_unlock_irqrestore(&ec->polling.lock, flags);
if (ec->common.global_lock)
acpi_release_global_lock(glk);
return_VALUE(result);
}
static int
acpi_ec_polling_write (
union acpi_ec *ec,
u8 address,
u8 data)
{
int result = 0;
acpi_status status = AE_OK;
unsigned long flags = 0;
u32 glk = 0;
ACPI_FUNCTION_TRACE("acpi_ec_write");
if (!ec)
return_VALUE(-EINVAL);
if (ec->common.global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status))
return_VALUE(-ENODEV);
}
spin_lock_irqsave(&ec->polling.lock, flags);
acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->common.command_addr);
result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
if (result)
goto end;
acpi_hw_low_level_write(8, address, &ec->common.data_addr);
result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
if (result)
goto end;
acpi_hw_low_level_write(8, data, &ec->common.data_addr);
result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
if (result)
goto end;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
data, address));
end:
spin_unlock_irqrestore(&ec->polling.lock, flags);
if (ec->common.global_lock)
acpi_release_global_lock(glk);
return_VALUE(result);
}
static int
acpi_ec_burst_read (
union acpi_ec *ec,
u8 address,
u32 *data)
{
int status = 0;
u32 glk;
ACPI_FUNCTION_TRACE("acpi_ec_read");
if (!ec || !data)
return_VALUE(-EINVAL);
retry:
*data = 0;
if (ec->common.global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status))
return_VALUE(-ENODEV);
}
WARN_ON(in_interrupt());
down(&ec->burst.sem);
if(acpi_ec_enter_burst_mode(ec))
goto end;
acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->common.command_addr);
status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
if (status) {
goto end;
}
acpi_hw_low_level_write(8, address, &ec->common.data_addr);
status= acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
if (status){
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
goto end;
}
acpi_hw_low_level_read(8, data, &ec->common.data_addr);
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
*data, address));
end:
acpi_ec_leave_burst_mode(ec);
up(&ec->burst.sem);
if (ec->common.global_lock)
acpi_release_global_lock(glk);
if(atomic_read(&ec->burst.leaving_burst) == 2){
ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
while(atomic_read(&ec->burst.pending_gpe)){
msleep(1);
}
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
goto retry;
}
return_VALUE(status);
}
static int
acpi_ec_burst_write (
union acpi_ec *ec,
u8 address,
u8 data)
{
int status = 0;
u32 glk;
u32 tmp;
ACPI_FUNCTION_TRACE("acpi_ec_write");
if (!ec)
return_VALUE(-EINVAL);
retry:
if (ec->common.global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status))
return_VALUE(-ENODEV);
}
WARN_ON(in_interrupt());
down(&ec->burst.sem);
if(acpi_ec_enter_burst_mode(ec))
goto end;
status = acpi_ec_read_status(ec);
if (status != -EINVAL &&
!(status & ACPI_EC_FLAG_BURST)){
acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->common.command_addr);
status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
if (status)
goto end;
acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
if(tmp != 0x90 ) /* Burst ACK byte*/
goto end;
}
/*Now we are in burst mode*/
acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->common.command_addr);
status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
if (status){
goto end;
}
acpi_hw_low_level_write(8, address, &ec->common.data_addr);
status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
if (status){
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
goto end;
}
acpi_hw_low_level_write(8, data, &ec->common.data_addr);
status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
if (status)
goto end;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
data, address));
end:
acpi_ec_leave_burst_mode(ec);
up(&ec->burst.sem);
if (ec->common.global_lock)
acpi_release_global_lock(glk);
if(atomic_read(&ec->burst.leaving_burst) == 2){
ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
while(atomic_read(&ec->burst.pending_gpe)){
msleep(1);
}
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
goto retry;
}
return_VALUE(status);
}
/*
* Externally callable EC access functions. For now, assume 1 EC only
*/
int
ec_read(u8 addr, u8 *val)
{
union acpi_ec *ec;
int err;
u32 temp_data;
if (!first_ec)
return -ENODEV;
ec = acpi_driver_data(first_ec);
err = acpi_ec_read(ec, addr, &temp_data);
if (!err) {
*val = temp_data;
return 0;
}
else
return err;
}
EXPORT_SYMBOL(ec_read);
int
ec_write(u8 addr, u8 val)
{
union acpi_ec *ec;
int err;
if (!first_ec)
return -ENODEV;
ec = acpi_driver_data(first_ec);
err = acpi_ec_write(ec, addr, val);
return err;
}
EXPORT_SYMBOL(ec_write);
static int
acpi_ec_query (
union acpi_ec *ec,
u32 *data)
{
if (acpi_ec_polling_mode)
return acpi_ec_polling_query(ec, data);
else
return acpi_ec_burst_query(ec, data);
}
static int
acpi_ec_polling_query (
union acpi_ec *ec,
u32 *data)
{
int result = 0;
acpi_status status = AE_OK;
unsigned long flags = 0;
u32 glk = 0;
ACPI_FUNCTION_TRACE("acpi_ec_query");
if (!ec || !data)
return_VALUE(-EINVAL);
*data = 0;
if (ec->common.global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status))
return_VALUE(-ENODEV);
}
/*
* Query the EC to find out which _Qxx method we need to evaluate.
* Note that successful completion of the query causes the ACPI_EC_SCI
* bit to be cleared (and thus clearing the interrupt source).
*/
spin_lock_irqsave(&ec->polling.lock, flags);
acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->common.command_addr);
result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
if (result)
goto end;
acpi_hw_low_level_read(8, data, &ec->common.data_addr);
if (!*data)
result = -ENODATA;
end:
spin_unlock_irqrestore(&ec->polling.lock, flags);
if (ec->common.global_lock)
acpi_release_global_lock(glk);
return_VALUE(result);
}
static int
acpi_ec_burst_query (
union acpi_ec *ec,
u32 *data)
{
int status = 0;
u32 glk;
ACPI_FUNCTION_TRACE("acpi_ec_query");
if (!ec || !data)
return_VALUE(-EINVAL);
*data = 0;
if (ec->common.global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status))
return_VALUE(-ENODEV);
}
down(&ec->burst.sem);
if(acpi_ec_enter_burst_mode(ec))
goto end;
/*
* Query the EC to find out which _Qxx method we need to evaluate.
* Note that successful completion of the query causes the ACPI_EC_SCI
* bit to be cleared (and thus clearing the interrupt source).
*/
acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->common.command_addr);
status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
if (status){
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
goto end;
}
acpi_hw_low_level_read(8, data, &ec->common.data_addr);
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
if (!*data)
status = -ENODATA;
end:
acpi_ec_leave_burst_mode(ec);
up(&ec->burst.sem);
if (ec->common.global_lock)
acpi_release_global_lock(glk);
if(atomic_read(&ec->burst.leaving_burst) == 2){
ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
status = -ENODATA;
}
return_VALUE(status);
}
/* --------------------------------------------------------------------------
Event Management
-------------------------------------------------------------------------- */
union acpi_ec_query_data {
acpi_handle handle;
u8 data;
};
static void
acpi_ec_gpe_query (
void *ec_cxt)
{
if (acpi_ec_polling_mode)
acpi_ec_gpe_polling_query(ec_cxt);
else
acpi_ec_gpe_burst_query(ec_cxt);
}
static void
acpi_ec_gpe_polling_query (
void *ec_cxt)
{
union acpi_ec *ec = (union acpi_ec *) ec_cxt;
u32 value = 0;
unsigned long flags = 0;
static char object_name[5] = {'_','Q','0','0','\0'};
const char hex[] = {'0','1','2','3','4','5','6','7',
'8','9','A','B','C','D','E','F'};
ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
if (!ec_cxt)
goto end;
spin_lock_irqsave(&ec->polling.lock, flags);
acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
spin_unlock_irqrestore(&ec->polling.lock, flags);
/* TBD: Implement asynch events!
* NOTE: All we care about are EC-SCI's. Other EC events are
* handled via polling (yuck!). This is because some systems
* treat EC-SCIs as level (versus EDGE!) triggered, preventing
* a purely interrupt-driven approach (grumble, grumble).
*/
if (!(value & ACPI_EC_FLAG_SCI))
goto end;
if (acpi_ec_query(ec, &value))
goto end;
object_name[2] = hex[((value >> 4) & 0x0F)];
object_name[3] = hex[(value & 0x0F)];
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
end:
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
}
static void
acpi_ec_gpe_burst_query (
void *ec_cxt)
{
union acpi_ec *ec = (union acpi_ec *) ec_cxt;
u32 value;
int result = -ENODATA;
static char object_name[5] = {'_','Q','0','0','\0'};
const char hex[] = {'0','1','2','3','4','5','6','7',
'8','9','A','B','C','D','E','F'};
ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
result = acpi_ec_query(ec, &value);
if (result)
goto end;
object_name[2] = hex[((value >> 4) & 0x0F)];
object_name[3] = hex[(value & 0x0F)];
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
end:
atomic_dec(&ec->burst.pending_gpe);
return;
}
static u32
acpi_ec_gpe_handler (
void *data)
{
if (acpi_ec_polling_mode)
return acpi_ec_gpe_polling_handler(data);
else
return acpi_ec_gpe_burst_handler(data);
}
static u32
acpi_ec_gpe_polling_handler (
void *data)
{
acpi_status status = AE_OK;
union acpi_ec *ec = (union acpi_ec *) data;
if (!ec)
return ACPI_INTERRUPT_NOT_HANDLED;
acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
acpi_ec_gpe_query, ec);
if (status == AE_OK)
return ACPI_INTERRUPT_HANDLED;
else
return ACPI_INTERRUPT_NOT_HANDLED;
}
static u32
acpi_ec_gpe_burst_handler (
void *data)
{
acpi_status status = AE_OK;
u32 value;
union acpi_ec *ec = (union acpi_ec *) data;
if (!ec)
return ACPI_INTERRUPT_NOT_HANDLED;
acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
value = acpi_ec_read_status(ec);
if((value & ACPI_EC_FLAG_IBF) &&
!(value & ACPI_EC_FLAG_BURST) &&
(atomic_read(&ec->burst.leaving_burst) == 0)) {
/*
* the embedded controller disables
* burst mode for any reason other
* than the burst disable command
* to process critical event.
*/
atomic_set(&ec->burst.leaving_burst , 2); /* block current pending transaction
and retry */
wake_up(&ec->burst.wait);
}else {
if ((ec->burst.expect_event == ACPI_EC_EVENT_OBF &&
(value & ACPI_EC_FLAG_OBF)) ||
(ec->burst.expect_event == ACPI_EC_EVENT_IBE &&
!(value & ACPI_EC_FLAG_IBF))) {
ec->burst.expect_event = 0;
wake_up(&ec->burst.wait);
return ACPI_INTERRUPT_HANDLED;
}
}
if (value & ACPI_EC_FLAG_SCI){
atomic_add(1, &ec->burst.pending_gpe) ;
status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
acpi_ec_gpe_query, ec);
return status == AE_OK ?
ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
}
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
return status == AE_OK ?
ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
}
/* --------------------------------------------------------------------------
Address Space Management
-------------------------------------------------------------------------- */
static acpi_status
acpi_ec_space_setup (
acpi_handle region_handle,
u32 function,
void *handler_context,
void **return_context)
{
/*
* The EC object is in the handler context and is needed
* when calling the acpi_ec_space_handler.
*/
*return_context = (function != ACPI_REGION_DEACTIVATE) ?
handler_context : NULL;
return AE_OK;
}
static acpi_status
acpi_ec_space_handler (
u32 function,
acpi_physical_address address,
u32 bit_width,
acpi_integer *value,
void *handler_context,
void *region_context)
{
int result = 0;
union acpi_ec *ec = NULL;
u64 temp = *value;
acpi_integer f_v = 0;
int i = 0;
ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
if ((address > 0xFF) || !value || !handler_context)
return_VALUE(AE_BAD_PARAMETER);
if (bit_width != 8 && acpi_strict) {
printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n");
return_VALUE(AE_BAD_PARAMETER);
}
ec = (union acpi_ec *) handler_context;
next_byte:
switch (function) {
case ACPI_READ:
temp = 0;
result = acpi_ec_read(ec, (u8) address, (u32 *)&temp);
break;
case ACPI_WRITE:
result = acpi_ec_write(ec, (u8) address, (u8) temp);
break;
default:
result = -EINVAL;
goto out;
break;
}
bit_width -= 8;
if (bit_width) {
if (function == ACPI_READ)
f_v |= temp << 8 * i;
if (function == ACPI_WRITE)
temp >>= 8;
i++;
address++;
goto next_byte;
}
if (function == ACPI_READ) {
f_v |= temp << 8 * i;
*value = f_v;
}
out:
switch (result) {
case -EINVAL:
return_VALUE(AE_BAD_PARAMETER);
break;
case -ENODEV:
return_VALUE(AE_NOT_FOUND);
break;
case -ETIME:
return_VALUE(AE_TIME);
break;
default:
return_VALUE(AE_OK);
}
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
static struct proc_dir_entry *acpi_ec_dir;
static int
acpi_ec_read_info (struct seq_file *seq, void *offset)
{
union acpi_ec *ec = (union acpi_ec *) seq->private;
ACPI_FUNCTION_TRACE("acpi_ec_read_info");
if (!ec)
goto end;
seq_printf(seq, "gpe bit: 0x%02x\n",
(u32) ec->common.gpe_bit);
seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
(u32) ec->common.status_addr.address, (u32) ec->common.data_addr.address);
seq_printf(seq, "use global lock: %s\n",
ec->common.global_lock?"yes":"no");
acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
end:
return_VALUE(0);
}
static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_ec_read_info, PDE(inode)->data);
}
static struct file_operations acpi_ec_info_ops = {
.open = acpi_ec_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static int
acpi_ec_add_fs (
struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
acpi_ec_dir);
if (!acpi_device_dir(device))
return_VALUE(-ENODEV);
}
entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
"Unable to create '%s' fs entry\n",
ACPI_EC_FILE_INFO));
else {
entry->proc_fops = &acpi_ec_info_ops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
return_VALUE(0);
}
static int
acpi_ec_remove_fs (
struct acpi_device *device)
{
ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
if (acpi_device_dir(device)) {
remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
acpi_device_dir(device) = NULL;
}
return_VALUE(0);
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static int
acpi_ec_polling_add (
struct acpi_device *device)
{
int result = 0;
acpi_status status = AE_OK;
union acpi_ec *ec = NULL;
unsigned long uid;
ACPI_FUNCTION_TRACE("acpi_ec_add");
if (!device)
return_VALUE(-EINVAL);
ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
if (!ec)
return_VALUE(-ENOMEM);
memset(ec, 0, sizeof(union acpi_ec));
ec->common.handle = device->handle;
ec->common.uid = -1;
spin_lock_init(&ec->polling.lock);
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
acpi_driver_data(device) = ec;
/* Use the global lock for all EC transactions? */
acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, &ec->common.global_lock);
/* If our UID matches the UID for the ECDT-enumerated EC,
we now have the *real* EC info, so kill the makeshift one.*/
acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
if (ec_ecdt && ec_ecdt->common.uid == uid) {
acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, &acpi_ec_gpe_handler);
kfree(ec_ecdt);
}
/* Get GPE bit assignment (EC events). */
/* TODO: Add support for _GPE returning a package */
status = acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, &ec->common.gpe_bit);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error obtaining GPE bit assignment\n"));
result = -ENODEV;
goto end;
}
result = acpi_ec_add_fs(device);
if (result)
goto end;
printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
acpi_device_name(device), acpi_device_bid(device),
(u32) ec->common.gpe_bit);
if (!first_ec)
first_ec = device;
end:
if (result)
kfree(ec);
return_VALUE(result);
}
static int
acpi_ec_burst_add (
struct acpi_device *device)
{
int result = 0;
acpi_status status = AE_OK;
union acpi_ec *ec = NULL;
unsigned long uid;
ACPI_FUNCTION_TRACE("acpi_ec_add");
if (!device)
return_VALUE(-EINVAL);
ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
if (!ec)
return_VALUE(-ENOMEM);
memset(ec, 0, sizeof(union acpi_ec));
ec->common.handle = device->handle;
ec->common.uid = -1;
atomic_set(&ec->burst.pending_gpe, 0);
atomic_set(&ec->burst.leaving_burst , 1);
init_MUTEX(&ec->burst.sem);
init_waitqueue_head(&ec->burst.wait);
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
acpi_driver_data(device) = ec;
/* Use the global lock for all EC transactions? */
acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, &ec->common.global_lock);
/* If our UID matches the UID for the ECDT-enumerated EC,
we now have the *real* EC info, so kill the makeshift one.*/
acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
if (ec_ecdt && ec_ecdt->common.uid == uid) {
acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, &acpi_ec_gpe_handler);
kfree(ec_ecdt);
}
/* Get GPE bit assignment (EC events). */
/* TODO: Add support for _GPE returning a package */
status = acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, &ec->common.gpe_bit);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error obtaining GPE bit assignment\n"));
result = -ENODEV;
goto end;
}
result = acpi_ec_add_fs(device);
if (result)
goto end;
printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
acpi_device_name(device), acpi_device_bid(device),
(u32) ec->common.gpe_bit);
if (!first_ec)
first_ec = device;
end:
if (result)
kfree(ec);
return_VALUE(result);
}
static int
acpi_ec_remove (
struct acpi_device *device,
int type)
{
union acpi_ec *ec = NULL;
ACPI_FUNCTION_TRACE("acpi_ec_remove");
if (!device)
return_VALUE(-EINVAL);
ec = acpi_driver_data(device);
acpi_ec_remove_fs(device);
kfree(ec);
return_VALUE(0);
}
static acpi_status
acpi_ec_io_ports (
struct acpi_resource *resource,
void *context)
{
union acpi_ec *ec = (union acpi_ec *) context;
struct acpi_generic_address *addr;
if (resource->id != ACPI_RSTYPE_IO) {
return AE_OK;
}
/*
* The first address region returned is the data port, and
* the second address region returned is the status/command
* port.
*/
if (ec->common.data_addr.register_bit_width == 0) {
addr = &ec->common.data_addr;
} else if (ec->common.command_addr.register_bit_width == 0) {
addr = &ec->common.command_addr;
} else {
return AE_CTRL_TERMINATE;
}
addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
addr->register_bit_width = 8;
addr->register_bit_offset = 0;
addr->address = resource->data.io.min_base_address;
return AE_OK;
}
static int
acpi_ec_start (
struct acpi_device *device)
{
acpi_status status = AE_OK;
union acpi_ec *ec = NULL;
ACPI_FUNCTION_TRACE("acpi_ec_start");
if (!device)
return_VALUE(-EINVAL);
ec = acpi_driver_data(device);
if (!ec)
return_VALUE(-EINVAL);
/*
* Get I/O port addresses. Convert to GAS format.
*/
status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
acpi_ec_io_ports, ec);
if (ACPI_FAILURE(status) || ec->common.command_addr.register_bit_width == 0) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses"));
return_VALUE(-ENODEV);
}
ec->common.status_addr = ec->common.command_addr;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
(u32) ec->common.gpe_bit, (u32) ec->common.command_addr.address,
(u32) ec->common.data_addr.address));
/*
* Install GPE handler
*/
status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec);
if (ACPI_FAILURE(status)) {
return_VALUE(-ENODEV);
}
acpi_set_gpe_type (NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
acpi_enable_gpe (NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
status = acpi_install_address_space_handler (ec->common.handle,
ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
&acpi_ec_space_setup, ec);
if (ACPI_FAILURE(status)) {
acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, &acpi_ec_gpe_handler);
return_VALUE(-ENODEV);
}
return_VALUE(AE_OK);
}
static int
acpi_ec_stop (
struct acpi_device *device,
int type)
{
acpi_status status = AE_OK;
union acpi_ec *ec = NULL;
ACPI_FUNCTION_TRACE("acpi_ec_stop");
if (!device)
return_VALUE(-EINVAL);
ec = acpi_driver_data(device);
status = acpi_remove_address_space_handler(ec->common.handle,
ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
if (ACPI_FAILURE(status))
return_VALUE(-ENODEV);
status = acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, &acpi_ec_gpe_handler);
if (ACPI_FAILURE(status))
return_VALUE(-ENODEV);
return_VALUE(0);
}
static acpi_status __init
acpi_fake_ecdt_callback (
acpi_handle handle,
u32 Level,
void *context,
void **retval)
{
if (acpi_ec_polling_mode)
return acpi_fake_ecdt_polling_callback(handle,
Level, context, retval);
else
return acpi_fake_ecdt_burst_callback(handle,
Level, context, retval);
}
static acpi_status __init
acpi_fake_ecdt_polling_callback (
acpi_handle handle,
u32 Level,
void *context,
void **retval)
{
acpi_status status;
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
acpi_ec_io_ports, ec_ecdt);
if (ACPI_FAILURE(status))
return status;
ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
ec_ecdt->common.uid = -1;
acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->common.gpe_bit);
if (ACPI_FAILURE(status))
return status;
spin_lock_init(&ec_ecdt->polling.lock);
ec_ecdt->common.global_lock = TRUE;
ec_ecdt->common.handle = handle;
printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
(u32) ec_ecdt->common.gpe_bit, (u32) ec_ecdt->common.command_addr.address,
(u32) ec_ecdt->common.data_addr.address);
return AE_CTRL_TERMINATE;
}
static acpi_status __init
acpi_fake_ecdt_burst_callback (
acpi_handle handle,
u32 Level,
void *context,
void **retval)
{
acpi_status status;
init_MUTEX(&ec_ecdt->burst.sem);
init_waitqueue_head(&ec_ecdt->burst.wait);
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
acpi_ec_io_ports, ec_ecdt);
if (ACPI_FAILURE(status))
return status;
ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
ec_ecdt->common.uid = -1;
acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->common.gpe_bit);
if (ACPI_FAILURE(status))
return status;
ec_ecdt->common.global_lock = TRUE;
ec_ecdt->common.handle = handle;
printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
(u32) ec_ecdt->common.gpe_bit, (u32) ec_ecdt->common.command_addr.address,
(u32) ec_ecdt->common.data_addr.address);
return AE_CTRL_TERMINATE;
}
/*
* Some BIOS (such as some from Gateway laptops) access EC region very early
* such as in BAT0._INI or EC._INI before an EC device is found and
* do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
* required, but if EC regison is accessed early, it is required.
* The routine tries to workaround the BIOS bug by pre-scan EC device
* It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
* op region (since _REG isn't invoked yet). The assumption is true for
* all systems found.
*/
static int __init
acpi_ec_fake_ecdt(void)
{
acpi_status status;
int ret = 0;
printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
if (!ec_ecdt) {
ret = -ENOMEM;
goto error;
}
memset(ec_ecdt, 0, sizeof(union acpi_ec));
status = acpi_get_devices (ACPI_EC_HID,
acpi_fake_ecdt_callback,
NULL,
NULL);
if (ACPI_FAILURE(status)) {
kfree(ec_ecdt);
ec_ecdt = NULL;
ret = -ENODEV;
goto error;
}
return 0;
error:
printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
return ret;
}
static int __init
acpi_ec_get_real_ecdt(void)
{
if (acpi_ec_polling_mode)
return acpi_ec_polling_get_real_ecdt();
else
return acpi_ec_burst_get_real_ecdt();
}
static int __init
acpi_ec_polling_get_real_ecdt(void)
{
acpi_status status;
struct acpi_table_ecdt *ecdt_ptr;
status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
(struct acpi_table_header **) &ecdt_ptr);
if (ACPI_FAILURE(status))
return -ENODEV;
printk(KERN_INFO PREFIX "Found ECDT\n");
/*
* Generate a temporary ec context to use until the namespace is scanned
*/
ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
if (!ec_ecdt)
return -ENOMEM;
memset(ec_ecdt, 0, sizeof(union acpi_ec));
ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
spin_lock_init(&ec_ecdt->polling.lock);
/* use the GL just to be safe */
ec_ecdt->common.global_lock = TRUE;
ec_ecdt->common.uid = ecdt_ptr->uid;
status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
if (ACPI_FAILURE(status)) {
goto error;
}
return 0;
error:
printk(KERN_ERR PREFIX "Could not use ECDT\n");
kfree(ec_ecdt);
ec_ecdt = NULL;
return -ENODEV;
}
static int __init
acpi_ec_burst_get_real_ecdt(void)
{
acpi_status status;
struct acpi_table_ecdt *ecdt_ptr;
status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
(struct acpi_table_header **) &ecdt_ptr);
if (ACPI_FAILURE(status))
return -ENODEV;
printk(KERN_INFO PREFIX "Found ECDT\n");
/*
* Generate a temporary ec context to use until the namespace is scanned
*/
ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
if (!ec_ecdt)
return -ENOMEM;
memset(ec_ecdt, 0, sizeof(union acpi_ec));
init_MUTEX(&ec_ecdt->burst.sem);
init_waitqueue_head(&ec_ecdt->burst.wait);
ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
/* use the GL just to be safe */
ec_ecdt->common.global_lock = TRUE;
ec_ecdt->common.uid = ecdt_ptr->uid;
status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
if (ACPI_FAILURE(status)) {
goto error;
}
return 0;
error:
printk(KERN_ERR PREFIX "Could not use ECDT\n");
kfree(ec_ecdt);
ec_ecdt = NULL;
return -ENODEV;
}
static int __initdata acpi_fake_ecdt_enabled;
int __init
acpi_ec_ecdt_probe (void)
{
acpi_status status;
int ret;
ret = acpi_ec_get_real_ecdt();
/* Try to make a fake ECDT */
if (ret && acpi_fake_ecdt_enabled) {
ret = acpi_ec_fake_ecdt();
}
if (ret)
return 0;
/*
* Install GPE handler
*/
status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler,
ec_ecdt);
if (ACPI_FAILURE(status)) {
goto error;
}
acpi_set_gpe_type (NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
acpi_enable_gpe (NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT,
ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
&acpi_ec_space_setup, ec_ecdt);
if (ACPI_FAILURE(status)) {
acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
&acpi_ec_gpe_handler);
goto error;
}
return 0;
error:
printk(KERN_ERR PREFIX "Could not use ECDT\n");
kfree(ec_ecdt);
ec_ecdt = NULL;
return -ENODEV;
}
static int __init acpi_ec_init (void)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_ec_init");
if (acpi_disabled)
return_VALUE(0);
acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
if (!acpi_ec_dir)
return_VALUE(-ENODEV);
/* Now register the driver for the EC */
result = acpi_bus_register_driver(&acpi_ec_driver);
if (result < 0) {
remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
return_VALUE(-ENODEV);
}
return_VALUE(result);
}
subsys_initcall(acpi_ec_init);
/* EC driver currently not unloadable */
#if 0
static void __exit
acpi_ec_exit (void)
{
ACPI_FUNCTION_TRACE("acpi_ec_exit");
acpi_bus_unregister_driver(&acpi_ec_driver);
remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
return_VOID;
}
#endif /* 0 */
static int __init acpi_fake_ecdt_setup(char *str)
{
acpi_fake_ecdt_enabled = 1;
return 0;
}
__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
static int __init acpi_ec_set_polling_mode(char *str)
{
acpi_ec_polling_mode = EC_POLLING;
acpi_ec_driver.ops.add = acpi_ec_polling_add;
return 0;
}
__setup("ec_polling", acpi_ec_set_polling_mode);
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