Staging: android: add binder driver (457b9a6f) · Commits · 戴 / test

drivers/staging/android/Kconfig

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		@@ -6,4 +6,8 @@ config ANDROID
		---help---
		Enable support for various drivers needed on the Android platform

		config ANDROID_BINDER_IPC
		tristate "Android Binder IPC Driver"
		default y

		endmenu

drivers/staging/android/Makefile

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		obj-$(CONFIG_ANDROID) += android.o
		obj-$(CONFIG_ANDROID_BINDER_IPC) += binder.o

drivers/staging/android/binder.c

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drivers/staging/android/binder.h

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		/*
		* Copyright (C) 2008 Google, Inc.
		*
		* Based on, but no longer compatible with, the original
		* OpenBinder.org binder driver interface, which is:
		*
		* Copyright (c) 2005 Palmsource, Inc.
		*
		* This software is licensed under the terms of the GNU General Public
		* License version 2, as published by the Free Software Foundation, and
		* may be copied, distributed, and modified under those terms.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		*/

		#ifndef _LINUX_BINDER_H
		#define _LINUX_BINDER_H

		#include <linux/ioctl.h>

		#define B_PACK_CHARS(c1, c2, c3, c4) \
		((((c1)<<24)) \| (((c2)<<16)) \| (((c3)<<8)) \| (c4))
		#define B_TYPE_LARGE 0x85

		enum {
		BINDER_TYPE_BINDER = B_PACK_CHARS('s', 'b', '*', B_TYPE_LARGE),
		BINDER_TYPE_WEAK_BINDER = B_PACK_CHARS('w', 'b', '*', B_TYPE_LARGE),
		BINDER_TYPE_HANDLE = B_PACK_CHARS('s', 'h', '*', B_TYPE_LARGE),
		BINDER_TYPE_WEAK_HANDLE = B_PACK_CHARS('w', 'h', '*', B_TYPE_LARGE),
		BINDER_TYPE_FD = B_PACK_CHARS('f', 'd', '*', B_TYPE_LARGE),
		};

		enum {
		FLAT_BINDER_FLAG_PRIORITY_MASK = 0xff,
		FLAT_BINDER_FLAG_ACCEPTS_FDS = 0x100,
		};

		/*
		* This is the flattened representation of a Binder object for transfer
		* between processes. The 'offsets' supplied as part of a binder transaction
		* contains offsets into the data where these structures occur. The Binder
		* driver takes care of re-writing the structure type and data as it moves
		* between processes.
		*/
		struct flat_binder_object {
		/* 8 bytes for large_flat_header. */
		unsigned long type;
		unsigned long flags;

		/* 8 bytes of data. */
		union {
		void binder; / local object */
		signed long handle; /* remote object */
		};

		/* extra data associated with local object */
		void *cookie;
		};

		/*
		* On 64-bit platforms where user code may run in 32-bits the driver must
		* translate the buffer (and local binder) addresses apropriately.
		*/

		struct binder_write_read {
		signed long write_size; /* bytes to write */
		signed long write_consumed; /* bytes consumed by driver */
		unsigned long write_buffer;
		signed long read_size; /* bytes to read */
		signed long read_consumed; /* bytes consumed by driver */
		unsigned long read_buffer;
		};

		/* Use with BINDER_VERSION, driver fills in fields. */
		struct binder_version {
		/* driver protocol version -- increment with incompatible change */
		signed long protocol_version;
		};

		/* This is the current protocol version. */
		#define BINDER_CURRENT_PROTOCOL_VERSION 7

		#define BINDER_WRITE_READ _IOWR('b', 1, struct binder_write_read)
		#define BINDER_SET_IDLE_TIMEOUT _IOW('b', 3, int64_t)
		#define BINDER_SET_MAX_THREADS _IOW('b', 5, size_t)
		#define BINDER_SET_IDLE_PRIORITY _IOW('b', 6, int)
		#define BINDER_SET_CONTEXT_MGR _IOW('b', 7, int)
		#define BINDER_THREAD_EXIT _IOW('b', 8, int)
		#define BINDER_VERSION _IOWR('b', 9, struct binder_version)

		/*
		* NOTE: Two special error codes you should check for when calling
		* in to the driver are:
		*
		* EINTR -- The operation has been interupted. This should be
		* handled by retrying the ioctl() until a different error code
		* is returned.
		*
		* ECONNREFUSED -- The driver is no longer accepting operations
		* from your process. That is, the process is being destroyed.
		* You should handle this by exiting from your process. Note
		* that once this error code is returned, all further calls to
		* the driver from any thread will return this same code.
		*/

		enum transaction_flags {
		TF_ONE_WAY = 0x01, /* this is a one-way call: async, no return */
		TF_ROOT_OBJECT = 0x04, /* contents are the component's root object */
		TF_STATUS_CODE = 0x08, /* contents are a 32-bit status code */
		TF_ACCEPT_FDS = 0x10, /* allow replies with file descriptors */
		};

		struct binder_transaction_data {
		/* The first two are only used for bcTRANSACTION and brTRANSACTION,
		* identifying the target and contents of the transaction.
		*/
		union {
		size_t handle; /* target descriptor of command transaction */
		void ptr; / target descriptor of return transaction */
		} target;
		void cookie; / target object cookie */
		unsigned int code; /* transaction command */

		/* General information about the transaction. */
		unsigned int flags;
		pid_t sender_pid;
		uid_t sender_euid;
		size_t data_size; /* number of bytes of data */
		size_t offsets_size; /* number of bytes of offsets */

		/* If this transaction is inline, the data immediately
		* follows here; otherwise, it ends with a pointer to
		* the data buffer.
		*/
		union {
		struct {
		/* transaction data */
		const void *buffer;
		/* offsets from buffer to flat_binder_object structs */
		const void *offsets;
		} ptr;
		uint8_t buf[8];
		} data;
		};

		struct binder_ptr_cookie {
		void *ptr;
		void *cookie;
		};

		struct binder_pri_desc {
		int priority;
		int desc;
		};

		struct binder_pri_ptr_cookie {
		int priority;
		void *ptr;
		void *cookie;
		};

		enum BinderDriverReturnProtocol {
		BR_ERROR = _IOR('r', 0, int),
		/*
		* int: error code
		*/

		BR_OK = _IO('r', 1),
		/* No parameters! */

		BR_TRANSACTION = _IOR('r', 2, struct binder_transaction_data),
		BR_REPLY = _IOR('r', 3, struct binder_transaction_data),
		/*
		* binder_transaction_data: the received command.
		*/

		BR_ACQUIRE_RESULT = _IOR('r', 4, int),
		/*
		* not currently supported
		* int: 0 if the last bcATTEMPT_ACQUIRE was not successful.
		* Else the remote object has acquired a primary reference.
		*/

		BR_DEAD_REPLY = _IO('r', 5),
		/*
		* The target of the last transaction (either a bcTRANSACTION or
		* a bcATTEMPT_ACQUIRE) is no longer with us. No parameters.
		*/

		BR_TRANSACTION_COMPLETE = _IO('r', 6),
		/*
		* No parameters... always refers to the last transaction requested
		* (including replies). Note that this will be sent even for
		* asynchronous transactions.
		*/

		BR_INCREFS = _IOR('r', 7, struct binder_ptr_cookie),
		BR_ACQUIRE = _IOR('r', 8, struct binder_ptr_cookie),
		BR_RELEASE = _IOR('r', 9, struct binder_ptr_cookie),
		BR_DECREFS = _IOR('r', 10, struct binder_ptr_cookie),
		/*
		* void *: ptr to binder
		* void *: cookie for binder
		*/

		BR_ATTEMPT_ACQUIRE = _IOR('r', 11, struct binder_pri_ptr_cookie),
		/*
		* not currently supported
		* int: priority
		* void *: ptr to binder
		* void *: cookie for binder
		*/

		BR_NOOP = _IO('r', 12),
		/*
		* No parameters. Do nothing and examine the next command. It exists
		* primarily so that we can replace it with a BR_SPAWN_LOOPER command.
		*/

		BR_SPAWN_LOOPER = _IO('r', 13),
		/*
		* No parameters. The driver has determined that a process has no
		* threads waiting to service incomming transactions. When a process
		* receives this command, it must spawn a new service thread and
		* register it via bcENTER_LOOPER.
		*/

		BR_FINISHED = _IO('r', 14),
		/*
		* not currently supported
		* stop threadpool thread
		*/

		BR_DEAD_BINDER = _IOR('r', 15, void *),
		/*
		* void *: cookie
		*/
		BR_CLEAR_DEATH_NOTIFICATION_DONE = _IOR('r', 16, void *),
		/*
		* void *: cookie
		*/

		BR_FAILED_REPLY = _IO('r', 17),
		/*
		* The the last transaction (either a bcTRANSACTION or
		* a bcATTEMPT_ACQUIRE) failed (e.g. out of memory). No parameters.
		*/
		};

		enum BinderDriverCommandProtocol {
		BC_TRANSACTION = _IOW('c', 0, struct binder_transaction_data),
		BC_REPLY = _IOW('c', 1, struct binder_transaction_data),
		/*
		* binder_transaction_data: the sent command.
		*/

		BC_ACQUIRE_RESULT = _IOW('c', 2, int),
		/*
		* not currently supported
		* int: 0 if the last BR_ATTEMPT_ACQUIRE was not successful.
		* Else you have acquired a primary reference on the object.
		*/

		BC_FREE_BUFFER = _IOW('c', 3, int),
		/*
		* void *: ptr to transaction data received on a read
		*/

		BC_INCREFS = _IOW('c', 4, int),
		BC_ACQUIRE = _IOW('c', 5, int),
		BC_RELEASE = _IOW('c', 6, int),
		BC_DECREFS = _IOW('c', 7, int),
		/*
		* int: descriptor
		*/

		BC_INCREFS_DONE = _IOW('c', 8, struct binder_ptr_cookie),
		BC_ACQUIRE_DONE = _IOW('c', 9, struct binder_ptr_cookie),
		/*
		* void *: ptr to binder
		* void *: cookie for binder
		*/

		BC_ATTEMPT_ACQUIRE = _IOW('c', 10, struct binder_pri_desc),
		/*
		* not currently supported
		* int: priority
		* int: descriptor
		*/

		BC_REGISTER_LOOPER = _IO('c', 11),
		/*
		* No parameters.
		* Register a spawned looper thread with the device.
		*/

		BC_ENTER_LOOPER = _IO('c', 12),
		BC_EXIT_LOOPER = _IO('c', 13),
		/*
		* No parameters.
		* These two commands are sent as an application-level thread
		* enters and exits the binder loop, respectively. They are
		* used so the binder can have an accurate count of the number
		* of looping threads it has available.
		*/

		BC_REQUEST_DEATH_NOTIFICATION = _IOW('c', 14, struct binder_ptr_cookie),
		/*
		* void *: ptr to binder
		* void *: cookie
		*/

		BC_CLEAR_DEATH_NOTIFICATION = _IOW('c', 15, struct binder_ptr_cookie),
		/*
		* void *: ptr to binder
		* void *: cookie
		*/

		BC_DEAD_BINDER_DONE = _IOW('c', 16, void *),
		/*
		* void *: cookie
		*/
		};

		#endif /* _LINUX_BINDER_H */

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