[PATCH 3/3] ACPI EC: Add support for non-AML EC query handlers

Alexey Starikovskiy
2007-05-29T12:43:03Z

Signed-off-by: Alexey Starikovskiy <aystarik@gmail.com>
---

drivers/acpi/ec.c | 175 ++++++++++++++++++++++++++++++++++++++---------------
1 files changed, 125 insertions(+), 50 deletions(-)

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index ffb8361..10e8510 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -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>
@@ -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: "

@@ -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 */
@@ -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;
@@ -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;

/* --------------------------------------------------------------------------
@@ -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)
@@ -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 ?
@@ -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);
@@ -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)
@@ -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;
}
@@ -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;
@@ -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)
@@ -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;
@@ -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)
@@ -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;