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linux_old1/drivers/acpi/ec.c

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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("ec");
#define ACPI_EC_COMPONENT 0x00100000
#define ACPI_EC_CLASS "embedded_controller"
#define ACPI_EC_HID "PNP0C09"
#define ACPI_EC_DEVICE_NAME "Embedded Controller"
#define ACPI_EC_FILE_INFO "info"
#undef PREFIX
#define PREFIX "ACPI: EC: "
/* EC status register */
#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 */
/* EC commands */
enum ec_command {
ACPI_EC_COMMAND_READ = 0x80,
ACPI_EC_COMMAND_WRITE = 0x81,
ACPI_EC_BURST_ENABLE = 0x82,
ACPI_EC_BURST_DISABLE = 0x83,
ACPI_EC_COMMAND_QUERY = 0x84,
};
/* EC events */
enum ec_event {
ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */
ACPI_EC_EVENT_IBF_0, /* Input buffer empty */
};
#define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
static enum ec_mode {
EC_INTR = 1, /* Output buffer full */
EC_POLL, /* Input buffer empty */
} acpi_ec_mode = EC_INTR;
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_add(struct acpi_device *device);
static struct acpi_driver acpi_ec_driver = {
.name = "ec",
.class = ACPI_EC_CLASS,
.ids = ACPI_EC_HID,
.ops = {
.add = acpi_ec_add,
.remove = acpi_ec_remove,
.start = acpi_ec_start,
.stop = acpi_ec_stop,
},
};
/* If we find an EC via the ECDT, we need to keep a ptr to its context */
static struct acpi_ec {
acpi_handle handle;
unsigned long uid;
unsigned long gpe;
unsigned long command_addr;
unsigned long data_addr;
unsigned long global_lock;
struct mutex lock;
atomic_t query_pending;
atomic_t event_count;
atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
wait_queue_head_t wait;
} *ec_ecdt;
/* External interfaces use first EC only, so remember */
static struct acpi_device *first_ec;
/* --------------------------------------------------------------------------
Transaction Management
-------------------------------------------------------------------------- */
static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
{
return inb(ec->command_addr);
}
static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
{
return inb(ec->data_addr);
}
static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
{
outb(command, ec->command_addr);
}
static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
{
outb(data, ec->data_addr);
}
static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event,
unsigned old_count)
{
u8 status = acpi_ec_read_status(ec);
if (old_count == atomic_read(&ec->event_count))
return 0;
if (event == ACPI_EC_EVENT_OBF_1) {
if (status & ACPI_EC_FLAG_OBF)
return 1;
} else if (event == ACPI_EC_EVENT_IBF_0) {
if (!(status & ACPI_EC_FLAG_IBF))
return 1;
}
return 0;
}
static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, unsigned count)
{
if (acpi_ec_mode == EC_POLL) {
unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
while (time_before(jiffies, delay)) {
if (acpi_ec_check_status(ec, event, 0))
return 0;
}
} else {
if (wait_event_timeout(ec->wait,
acpi_ec_check_status(ec, event, count),
msecs_to_jiffies(ACPI_EC_DELAY)) ||
acpi_ec_check_status(ec, event, 0)) {
return 0;
} else {
printk(KERN_ERR PREFIX "acpi_ec_wait timeout,"
" status = %d, expect_event = %d\n",
acpi_ec_read_status(ec), event);
}
}
return -ETIME;
}
#ifdef ACPI_FUTURE_USAGE
/*
* Note: samsung nv5000 doesn't work with ec burst mode.
* http://bugzilla.kernel.org/show_bug.cgi?id=4980
*/
int acpi_ec_enter_burst_mode(struct acpi_ec *ec)
{
u8 tmp = 0;
u8 status = 0;
status = acpi_ec_read_status(ec);
if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
if (status)
goto end;
acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE);
status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1);
tmp = acpi_ec_read_data(ec);
if (tmp != 0x90) { /* Burst ACK byte */
return -EINVAL;
}
}
atomic_set(&ec->leaving_burst, 0);
return 0;
end:
ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode"));
return -1;
}
int acpi_ec_leave_burst_mode(struct acpi_ec *ec)
{
u8 status = 0;
status = acpi_ec_read_status(ec);
if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)) {
status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
if (status)
goto end;
acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE);
acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
}
atomic_set(&ec->leaving_burst, 1);
return 0;
end:
ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode"));
return -1;
}
#endif /* ACPI_FUTURE_USAGE */
static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
const u8 * wdata, unsigned wdata_len,
u8 * rdata, unsigned rdata_len)
{
int result = 0;
unsigned count = atomic_read(&ec->event_count);
acpi_ec_write_cmd(ec, command);
for (; wdata_len > 0; --wdata_len) {
result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count);
if (result) {
printk(KERN_ERR PREFIX
"write_cmd timeout, command = %d\n", command);
goto end;
}
count = atomic_read(&ec->event_count);
acpi_ec_write_data(ec, *(wdata++));
}
if (!rdata_len) {
result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count);
if (result) {
printk(KERN_ERR PREFIX
"finish-write timeout, command = %d\n", command);
goto end;
}
} else if (command == ACPI_EC_COMMAND_QUERY) {
atomic_set(&ec->query_pending, 0);
}
for (; rdata_len > 0; --rdata_len) {
result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, count);
if (result) {
printk(KERN_ERR PREFIX "read timeout, command = %d\n",
command);
goto end;
}
count = atomic_read(&ec->event_count);
*(rdata++) = acpi_ec_read_data(ec);
}
end:
return result;
}
static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
const u8 * wdata, unsigned wdata_len,
u8 * rdata, unsigned rdata_len)
{
int status;
u32 glk;
if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
return -EINVAL;
if (rdata)
memset(rdata, 0, rdata_len);
mutex_lock(&ec->lock);
if (ec->global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status)) {
mutex_unlock(&ec->lock);
return -ENODEV;
}
}
/* Make sure GPE is enabled before doing transaction */
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0);
if (status) {
printk(KERN_DEBUG PREFIX
"input buffer is not empty, aborting transaction\n");
goto end;
}
status = acpi_ec_transaction_unlocked(ec, command,
wdata, wdata_len,
rdata, rdata_len);
end:
if (ec->global_lock)
acpi_release_global_lock(glk);
mutex_unlock(&ec->lock);
return status;
}
static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
{
int result;
u8 d;
result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ,
&address, 1, &d, 1);
*data = d;
return result;
}
static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
{
u8 wdata[2] = { address, data };
return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE,
wdata, 2, NULL, 0);
}
/*
* Externally callable EC access functions. For now, assume 1 EC only
*/
int ec_read(u8 addr, u8 * val)
{
struct acpi_ec *ec;
int err;
u8 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)
{
struct 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);
int ec_transaction(u8 command,
const u8 * wdata, unsigned wdata_len,
u8 * rdata, unsigned rdata_len)
{
struct acpi_ec *ec;
if (!first_ec)
return -ENODEV;
ec = acpi_driver_data(first_ec);
return acpi_ec_transaction(ec, command, wdata,
wdata_len, rdata, rdata_len);
}
EXPORT_SYMBOL(ec_transaction);
static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
{
int result;
u8 d;
if (!ec || !data)
return -EINVAL;
/*
* 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).
*/
result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1);
if (result)
return result;
if (!d)
return -ENODATA;
*data = d;
return 0;
}
/* --------------------------------------------------------------------------
Event Management
-------------------------------------------------------------------------- */
static void acpi_ec_gpe_query(void *ec_cxt)
{
struct acpi_ec *ec = (struct acpi_ec *)ec_cxt;
u8 value = 0;
char object_name[8];
if (!ec || acpi_ec_query(ec, &value))
return;
snprintf(object_name, 8, "_Q%2.2X", value);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name));
acpi_evaluate_object(ec->handle, object_name, NULL, NULL);
}
static u32 acpi_ec_gpe_handler(void *data)
{
acpi_status status = AE_OK;
u8 value;
struct acpi_ec *ec = (struct acpi_ec *)data;
atomic_inc(&ec->event_count);
if (acpi_ec_mode == EC_INTR) {
wake_up(&ec->wait);
}
value = acpi_ec_read_status(ec);
if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) {
atomic_set(&ec->query_pending, 1);
status =
acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query,
ec);
}
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;
struct acpi_ec *ec = NULL;
u64 temp = *value;
acpi_integer f_v = 0;
int i = 0;
if ((address > 0xFF) || !value || !handler_context)
return AE_BAD_PARAMETER;
if (bit_width != 8 && acpi_strict) {
return AE_BAD_PARAMETER;
}
ec = (struct acpi_ec *)handler_context;
next_byte:
switch (function) {
case ACPI_READ:
temp = 0;
result = acpi_ec_read(ec, (u8) address, (u8 *) & 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 AE_BAD_PARAMETER;
break;
case -ENODEV:
return AE_NOT_FOUND;
break;
case -ETIME:
return AE_TIME;
break;
default:
return 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)
{
struct acpi_ec *ec = (struct acpi_ec *)seq->private;
if (!ec)
goto end;
seq_printf(seq, "gpe: 0x%02x\n", (u32) ec->gpe);
seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
(u32) ec->command_addr, (u32) ec->data_addr);
seq_printf(seq, "use global lock: %s\n",
ec->global_lock ? "yes" : "no");
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
end:
return 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;
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
acpi_ec_dir);
if (!acpi_device_dir(device))
return -ENODEV;
}
entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_ec_info_ops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
return 0;
}
static int acpi_ec_remove_fs(struct acpi_device *device)
{
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 0;
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static int acpi_ec_add(struct acpi_device *device)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_ec *ec = NULL;
if (!device)
return -EINVAL;
ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
if (!ec)
return -ENOMEM;
ec->handle = device->handle;
ec->uid = -1;
mutex_init(&ec->lock);
atomic_set(&ec->query_pending, 0);
atomic_set(&ec->event_count, 1);
if (acpi_ec_mode == EC_INTR) {
atomic_set(&ec->leaving_burst, 1);
init_waitqueue_head(&ec->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->handle, "_GLK", NULL, &ec->global_lock);
/* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
if (ec_ecdt) {
acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
ACPI_ADR_SPACE_EC,
&acpi_ec_space_handler);
acpi_remove_gpe_handler(NULL, ec_ecdt->gpe,
&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->handle, "_GPE", NULL, &ec->gpe);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Obtaining GPE bit assignment"));
result = -ENODEV;
goto end;
}
result = acpi_ec_add_fs(device);
if (result)
goto end;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.",
acpi_device_name(device), acpi_device_bid(device),
(u32) ec->gpe));
if (!first_ec)
first_ec = device;
end:
if (result)
kfree(ec);
return result;
}
static int acpi_ec_remove(struct acpi_device *device, int type)
{
struct acpi_ec *ec = NULL;
if (!device)
return -EINVAL;
ec = acpi_driver_data(device);
acpi_ec_remove_fs(device);
kfree(ec);
return 0;
}
static acpi_status
acpi_ec_io_ports(struct acpi_resource *resource, void *context)
{
struct acpi_ec *ec = (struct acpi_ec *)context;
if (resource->type != ACPI_RESOURCE_TYPE_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->data_addr == 0) {
ec->data_addr = resource->data.io.minimum;
} else if (ec->command_addr == 0) {
ec->command_addr = resource->data.io.minimum;
} else {
return AE_CTRL_TERMINATE;
}
return AE_OK;
}
static int acpi_ec_start(struct acpi_device *device)
{
acpi_status status = AE_OK;
struct acpi_ec *ec = NULL;
if (!device)
return -EINVAL;
ec = acpi_driver_data(device);
if (!ec)
return -EINVAL;
/*
* Get I/O port addresses. Convert to GAS format.
*/
status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS,
acpi_ec_io_ports, ec);
if (ACPI_FAILURE(status) || ec->command_addr == 0) {
ACPI_EXCEPTION((AE_INFO, status,
"Error getting I/O port addresses"));
return -ENODEV;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx",
ec->gpe, ec->command_addr, ec->data_addr));
/*
* Install GPE handler
*/
status = acpi_install_gpe_handler(NULL, ec->gpe,
ACPI_GPE_EDGE_TRIGGERED,
&acpi_ec_gpe_handler, ec);
if (ACPI_FAILURE(status)) {
return -ENODEV;
}
acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
status = acpi_install_address_space_handler(ec->handle,
ACPI_ADR_SPACE_EC,
&acpi_ec_space_handler,
&acpi_ec_space_setup, ec);
if (ACPI_FAILURE(status)) {
acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
return -ENODEV;
}
return AE_OK;
}
static int acpi_ec_stop(struct acpi_device *device, int type)
{
acpi_status status = AE_OK;
struct acpi_ec *ec = NULL;
if (!device)
return -EINVAL;
ec = acpi_driver_data(device);
status = acpi_remove_address_space_handler(ec->handle,
ACPI_ADR_SPACE_EC,
&acpi_ec_space_handler);
if (ACPI_FAILURE(status))
return -ENODEV;
status = acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
if (ACPI_FAILURE(status))
return -ENODEV;
return 0;
}
static acpi_status __init
acpi_fake_ecdt_callback(acpi_handle handle,
u32 Level, void *context, void **retval)
{
acpi_status status;
mutex_init(&ec_ecdt->lock);
atomic_set(&ec_ecdt->event_count, 1);
if (acpi_ec_mode == EC_INTR) {
init_waitqueue_head(&ec_ecdt->wait);
}
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
acpi_ec_io_ports, ec_ecdt);
if (ACPI_FAILURE(status))
return status;
ec_ecdt->uid = -1;
acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe);
if (ACPI_FAILURE(status))
return status;
ec_ecdt->global_lock = TRUE;
ec_ecdt->handle = handle;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx",
ec_ecdt->gpe, ec_ecdt->command_addr,
ec_ecdt->data_addr));
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;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT"));
ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
if (!ec_ecdt) {
ret = -ENOMEM;
goto error;
}
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;
ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT"));
goto error;
}
return 0;
error:
return ret;
}
static int __init acpi_ec_get_real_ecdt(void)
{
acpi_status status;
struct acpi_table_ecdt *ecdt_ptr;
status = acpi_get_table(ACPI_SIG_ECDT, 1,
(struct acpi_table_header **)&ecdt_ptr);
if (ACPI_FAILURE(status))
return -ENODEV;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT"));
/*
* Generate a temporary ec context to use until the namespace is scanned
*/
ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
if (!ec_ecdt)
return -ENOMEM;
mutex_init(&ec_ecdt->lock);
atomic_set(&ec_ecdt->event_count, 1);
if (acpi_ec_mode == EC_INTR) {
init_waitqueue_head(&ec_ecdt->wait);
}
ec_ecdt->command_addr = ecdt_ptr->control.address;
ec_ecdt->data_addr = ecdt_ptr->data.address;
ec_ecdt->gpe = ecdt_ptr->gpe;
/* use the GL just to be safe */
ec_ecdt->global_lock = TRUE;
ec_ecdt->uid = ecdt_ptr->uid;
status = acpi_get_handle(NULL, ecdt_ptr->id, &ec_ecdt->handle);
if (ACPI_FAILURE(status)) {
goto error;
}
return 0;
error:
ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT"));
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->gpe,
ACPI_GPE_EDGE_TRIGGERED,
&acpi_ec_gpe_handler, ec_ecdt);
if (ACPI_FAILURE(status)) {
goto error;
}
acpi_set_gpe_type(NULL, ec_ecdt->gpe, ACPI_GPE_TYPE_RUNTIME);
acpi_enable_gpe(NULL, ec_ecdt->gpe, 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->gpe,
&acpi_ec_gpe_handler);
goto error;
}
return 0;
error:
ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT"));
kfree(ec_ecdt);
ec_ecdt = NULL;
return -ENODEV;
}
static int __init acpi_ec_init(void)
{
int result = 0;
if (acpi_disabled)
return 0;
acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
if (!acpi_ec_dir)
return -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 -ENODEV;
}
return result;
}
subsys_initcall(acpi_ec_init);
/* EC driver currently not unloadable */
#if 0
static void __exit acpi_ec_exit(void)
{
acpi_bus_unregister_driver(&acpi_ec_driver);
remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
return;
}
#endif /* 0 */
static int __init acpi_fake_ecdt_setup(char *str)
{
acpi_fake_ecdt_enabled = 1;
return 1;
}
__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
static int __init acpi_ec_set_intr_mode(char *str)
{
int intr;
if (!get_option(&str, &intr))
return 0;
if (intr) {
acpi_ec_mode = EC_INTR;
} else {
acpi_ec_mode = EC_POLL;
}
acpi_ec_driver.ops.add = acpi_ec_add;
printk(KERN_NOTICE PREFIX "%s mode.\n", intr ? "interrupt" : "polling");
return 1;
}
__setup("ec_intr=", acpi_ec_set_intr_mode);
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