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/*
* Copyright (C) 2016 Google, 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 GOLDFISH_PIPE_H
#define GOLDFISH_PIPE_H
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/miscdevice.h>
#include <linux/platform_device.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/goldfish.h>
#include <linux/mm.h>
#include <linux/acpi.h>
/* Initialize the legacy version of the pipe device driver */
int goldfish_pipe_device_init_v1(struct platform_device *pdev);
/* Deinitialize the legacy version of the pipe device driver */
void goldfish_pipe_device_deinit_v1(struct platform_device *pdev);
/* Forward declarations for the device struct */
struct goldfish_pipe;
struct goldfish_pipe_device_buffers;
/* The global driver data. Holds a reference to the i/o page used to
* communicate with the emulator, and a wake queue for blocked tasks
* waiting to be awoken.
*/
struct goldfish_pipe_dev {
/*
* Global device spinlock. Protects the following members:
* - pipes, pipes_capacity
* - [*pipes, *pipes + pipes_capacity) - array data
* - first_signalled_pipe,
* goldfish_pipe::prev_signalled,
* goldfish_pipe::next_signalled,
* goldfish_pipe::signalled_flags - all singnalled-related fields,
* in all allocated pipes
* - open_command_params - PIPE_CMD_OPEN-related buffers
*
* It looks like a lot of different fields, but the trick is that the only
* operation that happens often is the signalled pipes array manipulation.
* That's why it's OK for now to keep the rest of the fields under the same
* lock. If we notice too much contention because of PIPE_CMD_OPEN,
* then we should add a separate lock there.
*/
spinlock_t lock;
/*
* Array of the pipes of |pipes_capacity| elements,
* indexed by goldfish_pipe::id
*/
struct goldfish_pipe **pipes;
u32 pipes_capacity;
/* Pointers to the buffers host uses for interaction with this driver */
struct goldfish_pipe_dev_buffers *buffers;
/* Head of a doubly linked list of signalled pipes */
struct goldfish_pipe *first_signalled_pipe;
/* Some device-specific data */
int irq;
int version;
unsigned char __iomem *base;
/* v1-specific access parameters */
struct access_params *aps;
/* ptr to platform device's device struct */
struct device *pdev_dev;
};
extern struct goldfish_pipe_dev goldfish_pipe_dev;
#endif /* GOLDFISH_PIPE_H */
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