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Subject[PATCH, RFC] [2/3] ACPI support for generic in-kernel AC status
The included patch adds support for the generic in-kernel AC status 
code. Each AC adapter device is added to a list - when queried, if at
least one claims to be online then we assume that the system is on AC.

Signed-Off-By: Matthew Garrett <mjg59@srcf.ucam.org>

diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
index 61f95ce..aa2d9b9 100644
--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -29,6 +29,7 @@
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+#include <linux/pm.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

@@ -67,8 +68,11 @@ static struct acpi_driver acpi_ac_driver
struct acpi_ac {
acpi_handle handle;
unsigned long state;
+ struct list_head entry;
};

+static struct list_head ac_adapter_list;
+
static struct file_operations acpi_ac_fops = {
.open = acpi_ac_open_fs,
.read = seq_read,
@@ -255,6 +259,8 @@ static int acpi_ac_add(struct acpi_devic
goto end;
}

+ list_add(&ac->entry, &ac_adapter_list);
+
printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
acpi_device_name(device), acpi_device_bid(device),
ac->state ? "on-line" : "off-line");
@@ -288,17 +294,34 @@ static int acpi_ac_remove(struct acpi_de

acpi_ac_remove_fs(device);

+ list_del(&ac->entry);
+
kfree(ac);

return_VALUE(0);
}

+static int acpi_ac_online_status(void)
+{
+ struct acpi_ac *adapter;
+
+ list_for_each_entry(adapter, &ac_adapter_list, entry) {
+ acpi_ac_get_state(adapter);
+ if (adapter->state)
+ return 1;
+ }
+
+ return 0;
+}
+
static int __init acpi_ac_init(void)
{
int result = 0;

ACPI_FUNCTION_TRACE("acpi_ac_init");

+ INIT_LIST_HEAD(&ac_adapter_list);
+
acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
if (!acpi_ac_dir)
return_VALUE(-ENODEV);
@@ -310,6 +333,8 @@ static int __init acpi_ac_init(void)
return_VALUE(-ENODEV);
}

+ pm_set_ac_status(acpi_ac_online_status);
+
return_VALUE(0);
}

@@ -317,6 +342,8 @@ static void __exit acpi_ac_exit(void)
{
ACPI_FUNCTION_TRACE("acpi_ac_exit");

+ pm_set_ac_status(NULL);
+
acpi_bus_unregister_driver(&acpi_ac_driver);

remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
--
Matthew Garrett | mjg59@srcf.ucam.org
-
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