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ACPI EC: Add support for non-AML EC query handlers
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Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
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Alexey Starikovskiy authored and Len Brown committed Jun 23, 2007
1 parent 4350933 commit 837012e
Showing 1 changed file with 125 additions and 50 deletions.
175 changes: 125 additions & 50 deletions drivers/acpi/ec.c
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
Expand All @@ -43,6 +44,7 @@
#define ACPI_EC_HID "PNP0C09"
#define ACPI_EC_DEVICE_NAME "Embedded Controller"
#define ACPI_EC_FILE_INFO "info"

#undef PREFIX
#define PREFIX "ACPI: EC: "

Expand All @@ -60,6 +62,7 @@ enum ec_command {
ACPI_EC_BURST_DISABLE = 0x83,
ACPI_EC_COMMAND_QUERY = 0x84,
};

/* EC events */
enum ec_event {
ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */
Expand Down Expand Up @@ -93,6 +96,16 @@ static struct acpi_driver acpi_ec_driver = {

/* If we find an EC via the ECDT, we need to keep a ptr to its context */
/* External interfaces use first EC only, so remember */
typedef int (*acpi_ec_query_func) (void *data);

struct acpi_ec_query_handler {
struct list_head node;
acpi_ec_query_func func;
acpi_handle handle;
void *data;
u8 query_bit;
};

static struct acpi_ec {
acpi_handle handle;
unsigned long gpe;
Expand All @@ -103,6 +116,7 @@ static struct acpi_ec {
atomic_t query_pending;
atomic_t event_count;
wait_queue_head_t wait;
struct list_head list;
} *boot_ec, *first_ec;

/* --------------------------------------------------------------------------
Expand Down Expand Up @@ -393,21 +407,67 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
/* --------------------------------------------------------------------------
Event Management
-------------------------------------------------------------------------- */
int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
acpi_handle handle, acpi_ec_query_func func,
void *data)
{
struct acpi_ec_query_handler *handler =
kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
if (!handler)
return -ENOMEM;

handler->query_bit = query_bit;
handler->handle = handle;
handler->func = func;
handler->data = data;
mutex_lock(&ec->lock);
list_add_tail(&handler->node, &ec->list);
mutex_unlock(&ec->lock);
return 0;
}

EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);

void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
{
struct acpi_ec_query_handler *handler;
mutex_lock(&ec->lock);
list_for_each_entry(handler, &ec->list, node) {
if (query_bit == handler->query_bit) {
list_del(&handler->node);
kfree(handler);
break;
}
}
mutex_unlock(&ec->lock);
}

EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);

static void acpi_ec_gpe_query(void *ec_cxt)
{
struct acpi_ec *ec = ec_cxt;
u8 value = 0;
char object_name[8];
struct acpi_ec_query_handler *handler, copy;

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);
mutex_lock(&ec->lock);
list_for_each_entry(handler, &ec->list, node) {
if (value == handler->query_bit) {
/* have custom handler for this bit */
memcpy(&copy, handler, sizeof(copy));
mutex_unlock(&ec->lock);
if (copy.func) {
copy.func(copy.data);
} else if (copy.handle) {
acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
}
return;
}
}
mutex_unlock(&ec->lock);
printk(KERN_ERR PREFIX "Handler for query 0x%x is not found!\n", value);
}

static u32 acpi_ec_gpe_handler(void *data)
Expand All @@ -426,8 +486,7 @@ static u32 acpi_ec_gpe_handler(void *data)
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);
acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec);
}

return status == AE_OK ?
Expand Down Expand Up @@ -574,9 +633,6 @@ static int acpi_ec_remove_fs(struct acpi_device *device)
static acpi_status
ec_parse_io_ports(struct acpi_resource *resource, void *context);

static acpi_status
ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval);

static struct acpi_ec *make_acpi_ec(void)
{
struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
Expand All @@ -587,13 +643,52 @@ static struct acpi_ec *make_acpi_ec(void)
atomic_set(&ec->event_count, 1);
mutex_init(&ec->lock);
init_waitqueue_head(&ec->wait);
INIT_LIST_HEAD(&ec->list);

return ec;
}

static acpi_status
acpi_ec_register_query_methods(acpi_handle handle, u32 level,
void *context, void **return_value)
{
struct acpi_namespace_node *node = handle;
struct acpi_ec *ec = context;
int value = 0;
if (sscanf(node->name.ascii, "_Q%x", &value) == 1) {
acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
}
return AE_OK;
}

static int ec_parse_device(struct acpi_ec *ec, acpi_handle handle)
{
if (ACPI_FAILURE(acpi_walk_resources(handle, METHOD_NAME__CRS,
ec_parse_io_ports, ec)))
return -EINVAL;

/* Get GPE bit assignment (EC events). */
/* TODO: Add support for _GPE returning a package */
if (ACPI_FAILURE(acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe)))
return -EINVAL;

/* Use the global lock for all EC transactions? */
acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);

/* Find and register all query methods */
acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1,
acpi_ec_register_query_methods, ec, NULL);

ec->handle = handle;

printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx",
ec->gpe, ec->command_addr, ec->data_addr);

return 0;
}

static int acpi_ec_add(struct acpi_device *device)
{
acpi_status status = AE_OK;
struct acpi_ec *ec = NULL;

if (!device)
Expand All @@ -606,8 +701,7 @@ static int acpi_ec_add(struct acpi_device *device)
if (!ec)
return -ENOMEM;

status = ec_parse_device(device->handle, 0, ec, NULL);
if (status != AE_CTRL_TERMINATE) {
if (ec_parse_device(ec, device->handle)) {
kfree(ec);
return -EINVAL;
}
Expand All @@ -618,6 +712,8 @@ static int acpi_ec_add(struct acpi_device *device)
/* We might have incorrect info for GL at boot time */
mutex_lock(&boot_ec->lock);
boot_ec->global_lock = ec->global_lock;
/* Copy handlers from new ec into boot ec */
list_splice(&ec->list, &boot_ec->list);
mutex_unlock(&boot_ec->lock);
kfree(ec);
ec = boot_ec;
Expand All @@ -628,18 +724,24 @@ static int acpi_ec_add(struct acpi_device *device)
acpi_driver_data(device) = ec;

acpi_ec_add_fs(device);

return 0;
}

static int acpi_ec_remove(struct acpi_device *device, int type)
{
struct acpi_ec *ec;
struct acpi_ec_query_handler *handler;

if (!device)
return -EINVAL;

ec = acpi_driver_data(device);
mutex_lock(&ec->lock);
list_for_each_entry(handler, &ec->list, node) {
list_del(&handler->node);
kfree(handler);
}
mutex_unlock(&ec->lock);
acpi_ec_remove_fs(device);
acpi_driver_data(device) = NULL;
if (ec == first_ec)
Expand Down Expand Up @@ -695,15 +797,13 @@ static int ec_install_handlers(struct acpi_ec *ec)
return -ENODEV;
}

/* EC is fully operational, allow queries */
atomic_set(&ec->query_pending, 0);

return 0;
}

static int acpi_ec_start(struct acpi_device *device)
{
struct acpi_ec *ec;
int ret = 0;

if (!device)
return -EINVAL;
Expand All @@ -714,10 +814,13 @@ static int acpi_ec_start(struct acpi_device *device)
return -EINVAL;

/* Boot EC is already working */
if (ec == boot_ec)
return 0;
if (ec != boot_ec)
ret = ec_install_handlers(ec);

/* EC is fully operational, allow queries */
atomic_set(&ec->query_pending, 0);

return ec_install_handlers(ec);
return ret;
}

static int acpi_ec_stop(struct acpi_device *device, int type)
Expand Down Expand Up @@ -749,34 +852,6 @@ static int acpi_ec_stop(struct acpi_device *device, int type)
return 0;
}

static acpi_status
ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
{
acpi_status status;

struct acpi_ec *ec = context;
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
ec_parse_io_ports, ec);
if (ACPI_FAILURE(status))
return status;

/* Get GPE bit assignment (EC events). */
/* TODO: Add support for _GPE returning a package */
status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe);
if (ACPI_FAILURE(status))
return status;

/* Use the global lock for all EC transactions? */
acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);

ec->handle = handle;

printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx",
ec->gpe, ec->command_addr, ec->data_addr);

return AE_CTRL_TERMINATE;
}

int __init acpi_ec_ecdt_probe(void)
{
int ret;
Expand Down

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