[PATCH 7/140] ACPI: convert to sysfs framework

Len Brown
2007-02-07T18:53:00Z

From: Patrick Mochel <mochel@linux.intel.com>

Setup new sysfs framework

1. Remove /sys/firmware/acpi
2. Add ACPI device in device tree.

File "eject" for every device that has _EJ0 method is moved from
/sys/firmware to /sys/devices.
Operation on this file is exactly the same as before.
i.e. echo 1 to "eject" will cause hot removal of this device.
Corresponding changes should be made in userspace for hot removal.

Signed-off-by: Li Shaohua <shaohua.li@intel.com>
Signed-off-by: Zhang Rui<rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/acpi/bus.c | 2 +-
drivers/acpi/container.c | 6 +-
drivers/acpi/processor_core.c | 8 +-
drivers/acpi/scan.c | 187 +++++++++--------------------------------
include/acpi/acpi_bus.h | 1 -
5 files changed, 49 insertions(+), 155 deletions(-)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 279c4ba..da471f6 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -195,7 +195,7 @@ int acpi_bus_set_power(acpi_handle handle, int state)

if (!device->flags.power_manageable) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
- device->kobj.name));
+ device->dev.kobj.name));
return -ENODEV;
}
/*
diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index 871aa52..914f56a 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -168,7 +168,7 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
if (ACPI_FAILURE(status) || !device) {
result = container_device_add(&device, handle);
if (!result)
- kobject_uevent(&device->kobj,
+ kobject_uevent(&device->dev.kobj,
KOBJ_ONLINE);
else
printk("Failed to add container\n");
@@ -176,13 +176,13 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
} else {
if (ACPI_SUCCESS(status)) {
/* device exist and this is a remove request */
- kobject_uevent(&device->kobj, KOBJ_OFFLINE);
+ kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
}
}
break;
case ACPI_NOTIFY_EJECT_REQUEST:
if (!acpi_bus_get_device(handle, &device) && device) {
- kobject_uevent(&device->kobj, KOBJ_OFFLINE);
+ kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
}
break;
default:
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 1908e0d..46e72c3 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -711,7 +711,7 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
return -ENODEV;

if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
- kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
+ kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
}
return 0;
}
@@ -749,13 +749,13 @@ acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
}

if (pr->id >= 0 && (pr->id < NR_CPUS)) {
- kobject_uevent(&device->kobj, KOBJ_OFFLINE);
+ kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
break;
}

result = acpi_processor_start(device);
if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
- kobject_uevent(&device->kobj, KOBJ_ONLINE);
+ kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
} else {
printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
acpi_device_bid(device));
@@ -778,7 +778,7 @@ acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
}

if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
- kobject_uevent(&device->kobj, KOBJ_OFFLINE);
+ kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index b616e17..97f6bbd 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -24,126 +24,6 @@ static LIST_HEAD(acpi_device_list);
DEFINE_SPINLOCK(acpi_device_lock);
LIST_HEAD(acpi_wakeup_device_list);

-
-static void acpi_device_release_legacy(struct kobject *kobj)
-{
- struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj);
- kfree(dev->pnp.cid_list);
- kfree(dev);
-}
-
-struct acpi_device_attribute {
- struct attribute attr;
- ssize_t(*show) (struct acpi_device *, char *);
- ssize_t(*store) (struct acpi_device *, const char *, size_t);
-};
-
-typedef void acpi_device_sysfs_files(struct kobject *,
- const struct attribute *);
-
-static void setup_sys_fs_device_files(struct acpi_device *dev,
- acpi_device_sysfs_files * func);
-
-#define create_sysfs_device_files(dev) \
- setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
-#define remove_sysfs_device_files(dev) \
- setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
-
-#define to_acpi_dev(n) container_of(n, struct acpi_device, kobj)
-#define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
-
-static ssize_t acpi_device_attr_show(struct kobject *kobj,
- struct attribute *attr, char *buf)
-{
- struct acpi_device *device = to_acpi_dev(kobj);
- struct acpi_device_attribute *attribute = to_handle_attr(attr);
- return attribute->show ? attribute->show(device, buf) : -EIO;
-}
-static ssize_t acpi_device_attr_store(struct kobject *kobj,
- struct attribute *attr, const char *buf,
- size_t len)
-{
- struct acpi_device *device = to_acpi_dev(kobj);
- struct acpi_device_attribute *attribute = to_handle_attr(attr);
- return attribute->store ? attribute->store(device, buf, len) : -EIO;
-}
-
-static struct sysfs_ops acpi_device_sysfs_ops = {
- .show = acpi_device_attr_show,
- .store = acpi_device_attr_store,
-};
-
-static struct kobj_type ktype_acpi_ns = {
- .sysfs_ops = &acpi_device_sysfs_ops,
- .release = acpi_device_release_legacy,
-};
-
-static int namespace_uevent(struct kset *kset, struct kobject *kobj,
- char **envp, int num_envp, char *buffer,
- int buffer_size)
-{
- struct acpi_device *dev = to_acpi_dev(kobj);
- int i = 0;
- int len = 0;
-
- if (!dev->driver)
- return 0;
-
- if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
- "PHYSDEVDRIVER=%s", dev->driver->name))
- return -ENOMEM;
-
- envp[i] = NULL;
-
- return 0;
-}
-
-static struct kset_uevent_ops namespace_uevent_ops = {
- .uevent = &namespace_uevent,
-};
-
-static struct kset acpi_namespace_kset = {
- .kobj = {
- .name = "namespace",
- },
- .subsys = &acpi_subsys,
- .ktype = &ktype_acpi_ns,
- .uevent_ops = &namespace_uevent_ops,
-};
-
-/* --------------------------------------------------------------------------
- ACPI sysfs device file support
- -------------------------------------------------------------------------- */
-static ssize_t acpi_eject_store(struct acpi_device *device,
- const char *buf, size_t count);
-
-#define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
-static struct acpi_device_attribute acpi_device_attr_##_name = \
- __ATTR(_name, _mode, _show, _store)
-
-ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
-
-/**
- * setup_sys_fs_device_files - sets up the device files under device namespace
- * @dev: acpi_device object
- * @func: function pointer to create or destroy the device file
- */
-static void
-setup_sys_fs_device_files(struct acpi_device *dev,
- acpi_device_sysfs_files * func)
-{
- acpi_status status;
- acpi_handle temp = NULL;
-
- /*
- * If device has _EJ0, 'eject' file is created that is used to trigger
- * hot-removal function from userland.
- */
- status = acpi_get_handle(dev->handle, "_EJ0", &temp);
- if (ACPI_SUCCESS(status))
- (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
-}
-
static int acpi_eject_operation(acpi_handle handle, int lockable)
{
struct acpi_object_list arg_list;
@@ -180,7 +60,8 @@ static int acpi_eject_operation(acpi_handle handle, int lockable)
}

static ssize_t
-acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
+acpi_eject_store(struct device *d, struct device_attribute *attr,
+ const char *buf, size_t count)
{
int result;
int ret = count;
@@ -188,26 +69,27 @@ acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
acpi_status status;
acpi_handle handle;
acpi_object_type type = 0;
+ struct acpi_device *acpi_device = to_acpi_device(d);

if ((!count) || (buf[0] != '1')) {
return -EINVAL;
}
#ifndef FORCE_EJECT
- if (device->driver == NULL) {
+ if (acpi_device->driver == NULL) {
ret = -ENODEV;
goto err;
}
#endif
- status = acpi_get_type(device->handle, &type);
- if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {
+ status = acpi_get_type(acpi_device->handle, &type);
+ if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
ret = -ENODEV;
goto err;
}

- islockable = device->flags.lockable;
- handle = device->handle;
+ islockable = acpi_device->flags.lockable;
+ handle = acpi_device->handle;

- result = acpi_bus_trim(device, 1);
+ result = acpi_bus_trim(acpi_device, 1);

if (!result)
result = acpi_eject_operation(handle, islockable);
@@ -219,6 +101,35 @@ acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
return ret;
}

+static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
+
+static void acpi_device_setup_files(struct acpi_device *dev)
+{
+ acpi_status status;
+ acpi_handle temp;
+
+ /*
+ * If device has _EJ0, 'eject' file is created that is used to trigger
+ * hot-removal function from userland.
+ */
+ status = acpi_get_handle(dev->handle, "_EJ0", &temp);
+ if (ACPI_SUCCESS(status))
+ device_create_file(&dev->dev, &dev_attr_eject);
+}
+
+static void acpi_device_remove_files(struct acpi_device *dev)
+{
+ acpi_status status;
+ acpi_handle temp;
+
+ /*
+ * If device has _EJ0, 'eject' file is created that is used to trigger
+ * hot-removal function from userland.
+ */
+ status = acpi_get_handle(dev->handle, "_EJ0", &temp);
+ if (ACPI_SUCCESS(status))
+ device_remove_file(&dev->dev, &dev_attr_eject);
+}
/* --------------------------------------------------------------------------
ACPI Bus operations
-------------------------------------------------------------------------- */
@@ -353,8 +264,6 @@ static struct bus_type acpi_bus_type = {
static void acpi_device_register(struct acpi_device *device,
struct acpi_device *parent)
{
- int err;
-
/*
* Linkage
* -------
@@ -375,17 +284,6 @@ static void acpi_device_register(struct acpi_device *device,
list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
spin_unlock(&acpi_device_lock);

- strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN);
- if (parent)
- device->kobj.parent = &parent->kobj;
- device->kobj.ktype = &ktype_acpi_ns;
- device->kobj.kset = &acpi_namespace_kset;
- err = kobject_register(&device->kobj);
- if (err < 0)
- printk(KERN_WARNING "%s: kobject_register error: %d\n",
- __FUNCTION__, err);
- create_sysfs_device_files(device);
-
if (device->parent)
device->dev.parent = &parent->dev;
device->dev.bus = &acpi_bus_type;
@@ -393,6 +291,8 @@ static void acpi_device_register(struct acpi_device *device,
sprintf(device->dev.bus_id, "%s", device->pnp.bus_id);
device->dev.release = &acpi_device_release;
device_add(&device->dev);
+
+ acpi_device_setup_files(device);
}

static void acpi_device_unregister(struct acpi_device *device, int type)
@@ -409,9 +309,8 @@ static void acpi_device_unregister(struct acpi_device *device, int type)
spin_unlock(&acpi_device_lock);

acpi_detach_data(device->handle, acpi_bus_data_handler);
- remove_sysfs_device_files(device);
- kobject_unregister(&device->kobj);

+ acpi_device_remove_files(device);
device_unregister(&device->dev);
}

@@ -1353,10 +1252,6 @@ static int __init acpi_scan_init(void)
if (acpi_disabled)
return 0;

- result = kset_register(&acpi_namespace_kset);
- if (result < 0)
- printk(KERN_ERR PREFIX "kset_register error: %d\n", result);
-
result = bus_register(&acpi_bus_type);
if (result) {
/* We don't want to quit even if we failed to add suspend/resume */
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 807acf6..598fab3 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -299,7 +299,6 @@ struct acpi_device {
struct acpi_device_ops ops;
struct acpi_driver *driver;
void *driver_data;
- struct kobject kobj;
struct device dev;
};

--
1.5.0.rc3.39.gec804