Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/Documentation/driver-model/device.txt b/Documentation/driver-model/device.txt
new file mode 100644
index 0000000..58cc5dc
--- /dev/null
+++ b/Documentation/driver-model/device.txt
@@ -0,0 +1,154 @@
+
+The Basic Device Structure
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+struct device {
+ struct list_head g_list;
+ struct list_head node;
+ struct list_head bus_list;
+ struct list_head driver_list;
+ struct list_head intf_list;
+ struct list_head children;
+ struct device * parent;
+
+ char name[DEVICE_NAME_SIZE];
+ char bus_id[BUS_ID_SIZE];
+
+ spinlock_t lock;
+ atomic_t refcount;
+
+ struct bus_type * bus;
+ struct driver_dir_entry dir;
+
+ u32 class_num;
+
+ struct device_driver *driver;
+ void *driver_data;
+ void *platform_data;
+
+ u32 current_state;
+ unsigned char *saved_state;
+
+ void (*release)(struct device * dev);
+};
+
+Fields
+~~~~~~
+g_list: Node in the global device list.
+
+node: Node in device's parent's children list.
+
+bus_list: Node in device's bus's devices list.
+
+driver_list: Node in device's driver's devices list.
+
+intf_list: List of intf_data. There is one structure allocated for
+ each interface that the device supports.
+
+children: List of child devices.
+
+parent: *** FIXME ***
+
+name: ASCII description of device.
+ Example: " 3Com Corporation 3c905 100BaseTX [Boomerang]"
+
+bus_id: ASCII representation of device's bus position. This
+ field should be a name unique across all devices on the
+ bus type the device belongs to.
+
+ Example: PCI bus_ids are in the form of
+ <bus number>:<slot number>.<function number>
+ This name is unique across all PCI devices in the system.
+
+lock: Spinlock for the device.
+
+refcount: Reference count on the device.
+
+bus: Pointer to struct bus_type that device belongs to.
+
+dir: Device's sysfs directory.
+
+class_num: Class-enumerated value of the device.
+
+driver: Pointer to struct device_driver that controls the device.
+
+driver_data: Driver-specific data.
+
+platform_data: Platform data specific to the device.
+
+current_state: Current power state of the device.
+
+saved_state: Pointer to saved state of the device. This is usable by
+ the device driver controlling the device.
+
+release: Callback to free the device after all references have
+ gone away. This should be set by the allocator of the
+ device (i.e. the bus driver that discovered the device).
+
+
+Programming Interface
+~~~~~~~~~~~~~~~~~~~~~
+The bus driver that discovers the device uses this to register the
+device with the core:
+
+int device_register(struct device * dev);
+
+The bus should initialize the following fields:
+
+ - parent
+ - name
+ - bus_id
+ - bus
+
+A device is removed from the core when its reference count goes to
+0. The reference count can be adjusted using:
+
+struct device * get_device(struct device * dev);
+void put_device(struct device * dev);
+
+get_device() will return a pointer to the struct device passed to it
+if the reference is not already 0 (if it's in the process of being
+removed already).
+
+A driver can access the lock in the device structure using:
+
+void lock_device(struct device * dev);
+void unlock_device(struct device * dev);
+
+
+Attributes
+~~~~~~~~~~
+struct device_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct device * dev, char * buf, size_t count, loff_t off);
+ ssize_t (*store)(struct device * dev, const char * buf, size_t count, loff_t off);
+};
+
+Attributes of devices can be exported via drivers using a simple
+procfs-like interface.
+
+Please see Documentation/filesystems/sysfs.txt for more information
+on how sysfs works.
+
+Attributes are declared using a macro called DEVICE_ATTR:
+
+#define DEVICE_ATTR(name,mode,show,store)
+
+Example:
+
+DEVICE_ATTR(power,0644,show_power,store_power);
+
+This declares a structure of type struct device_attribute named
+'dev_attr_power'. This can then be added and removed to the device's
+directory using:
+
+int device_create_file(struct device *device, struct device_attribute * entry);
+void device_remove_file(struct device * dev, struct device_attribute * attr);
+
+Example:
+
+device_create_file(dev,&dev_attr_power);
+device_remove_file(dev,&dev_attr_power);
+
+The file name will be 'power' with a mode of 0644 (-rw-r--r--).
+