From: Zhang Rui <rui.zhang@xxxxxxxxx>
Add ACPI Power_resource sysfs interface.
Attribute Mode Description
state RO the current state of the Power Resource (0-OFF, 1-ON)
system_level RO the lowest power system sleep level OSPM must maintain
to keep this power resource on (0 equals to S0,etc)
resource_order RO
reference_count RO
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
drivers/acpi/power.c | 134 ++++++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 117 insertions(+), 17 deletions(-)
Index: linux-2.6.21-rc3-mm2/drivers/acpi/power.c
===================================================================
--- linux-2.6.21-rc3-mm2.orig/drivers/acpi/power.c 2007-03-19 10:26:42.000000000 +0800
+++ linux-2.6.21-rc3-mm2/drivers/acpi/power.c 2007-03-19 15:42:52.000000000 +0800
@@ -57,7 +57,6 @@ ACPI_MODULE_NAME("power");
static int acpi_power_add(struct acpi_device *device);
static int acpi_power_remove(struct acpi_device *device, int type);
static int acpi_power_resume(struct acpi_device *device);
-static int acpi_power_open_fs(struct inode *inode, struct file *file);
static struct acpi_driver acpi_power_driver = {
.name = "power",
@@ -87,13 +86,6 @@ struct acpi_power_resource {
static struct list_head acpi_power_resource_list;
-static const struct file_operations acpi_power_fops = {
- .open = acpi_power_open_fs,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
/* --------------------------------------------------------------------------
Power Resource Management
-------------------------------------------------------------------------- */
@@ -480,9 +472,82 @@ int acpi_power_transition(struct acpi_de
}
/* --------------------------------------------------------------------------
- FS Interface (/proc)
+ FS Interface (/sys)
-------------------------------------------------------------------------- */
+static ssize_t
+acpi_power_state_show(struct acpi_device *dev, char *buf)
+{
+ struct acpi_power_resource *resource = acpi_driver_data(dev);
+ int result;
+
+ if (!resource)
+ return -EINVAL;
+
+ result = acpi_power_get_state(resource);
+ if (result)
+ return result;
+
+ return sprintf(buf, "%d\n", resource->state);
+}
+static ACPI_DEVICE_ATTR(state, 0444, acpi_power_state_show, NULL);
+
+static ssize_t
+acpi_power_system_level_show(struct acpi_device *dev, char *buf)
+{
+ struct acpi_power_resource *resource = acpi_driver_data(dev);
+
+ if (!resource)
+ return -EINVAL;
+
+ return sprintf(buf, "%d\n", resource->system_level);
+}
+static ACPI_DEVICE_ATTR(system_level, 0444, acpi_power_system_level_show, NULL);
+
+static ssize_t
+acpi_power_resource_order_show(struct acpi_device *dev, char *buf)
+{
+ struct acpi_power_resource *resource = acpi_driver_data(dev);
+
+ if (!resource)
+ return -EINVAL;
+
+ return sprintf(buf, "%d\n", resource->order);
+}
+static ACPI_DEVICE_ATTR(resource_order, 0444, acpi_power_resource_order_show, NULL);
+
+static ssize_t
+acpi_power_reference_count_show(struct acpi_device *dev, char *buf)
+{
+ struct acpi_power_resource *resource = acpi_driver_data(dev);
+ int count = 0;
+ struct list_head *node, *next;
+ struct acpi_power_reference *ref;
+
+ if (!resource)
+ return -EINVAL;
+
+ mutex_lock(&resource->resource_lock);
+ list_for_each_safe(node, next, &resource->reference) {
+ ref = container_of(node, struct acpi_power_reference, node);
+ count++;
+ }
+ mutex_unlock(&resource->resource_lock);
+
+ return sprintf(buf, "%d\n", count);
+}
+static ACPI_DEVICE_ATTR(reference_count, 0444, acpi_power_reference_count_show, NULL);
+static struct device_attribute* power_attr[] = {
+ GET_DEV_ATTR(state),
+ GET_DEV_ATTR(system_level),
+ GET_DEV_ATTR(resource_order),
+ GET_DEV_ATTR(reference_count),
+ NULL,
+};
+/* --------------------------------------------------------------------------
+ FS Interface (/proc)
+ -------------------------------------------------------------------------- */
+#ifdef CONFIG_ACPI_PROCFS
static struct proc_dir_entry *acpi_power_dir;
static int acpi_power_seq_show(struct seq_file *seq, void *offset)
@@ -538,7 +603,14 @@ static int acpi_power_open_fs(struct ino
return single_open(file, acpi_power_seq_show, PDE(inode)->data);
}
-static int acpi_power_add_fs(struct acpi_device *device)
+static const struct file_operations acpi_power_fops = {
+ .open = acpi_power_open_fs,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int acpi_power_add_procfs(struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
@@ -566,7 +638,7 @@ static int acpi_power_add_fs(struct acpi
return 0;
}
-static int acpi_power_remove_fs(struct acpi_device *device)
+static void acpi_power_remove_procfs(struct acpi_device *device)
{
if (acpi_device_dir(device)) {
@@ -576,9 +648,27 @@ static int acpi_power_remove_fs(struct a
acpi_device_dir(device) = NULL;
}
+ return ;
+}
+
+static int acpi_power_procfs_init(void)
+{
+ acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
+ if (!acpi_power_dir)
+ return -ENODEV;
+
return 0;
}
+static void acpi_power_procfs_exit(void)
+{
+ remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
+
+ return ;
+}
+#else
+DECLARE_ACPI_DEVICE_PROCFS(power);
+#endif
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
@@ -632,17 +722,24 @@ static int acpi_power_add(struct acpi_de
break;
}
- result = acpi_power_add_fs(device);
+ result = acpi_device_add_sysfs(device, power_attr);
if (result)
goto end;
+ result = acpi_power_add_procfs(device);
+ if (result)
+ goto procfs_error;
+
printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
acpi_device_bid(device), resource->state ? "on" : "off");
+ goto end;
+
+ procfs_error:
+ acpi_device_remove_sysfs(device, power_attr);
end:
if (result)
kfree(resource);
-
return result;
}
@@ -657,7 +754,9 @@ static int acpi_power_remove(struct acpi
resource = acpi_driver_data(device);
- acpi_power_remove_fs(device);
+ acpi_power_remove_procfs(device);
+
+ acpi_device_remove_sysfs(device, power_attr);
mutex_lock(&resource->resource_lock);
list_for_each_safe(node, next, &resource->reference) {
@@ -710,13 +809,14 @@ static int __init acpi_power_init(void)
INIT_LIST_HEAD(&acpi_power_resource_list);
- acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
- if (!acpi_power_dir)
+ result = acpi_power_procfs_init();
+ if (result)
return -ENODEV;
+ acpi_power_driver.owner = THIS_MODULE;
result = acpi_bus_register_driver(&acpi_power_driver);
if (result < 0) {
- remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
+ acpi_power_procfs_exit();
return -ENODEV;
}
-
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