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/*
* drivers/video/tegra/dc/ext/control.c
*
* Copyright (C) 2011, NVIDIA Corporation
*
* Author: Robert Morell <rmorell@nvidia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include "tegra_dc_ext_priv.h"
static struct tegra_dc_ext_control g_control;
int tegra_dc_ext_process_hotplug(int output)
{
return tegra_dc_ext_queue_hotplug(&g_control, output);
}
static int
get_output_properties(struct tegra_dc_ext_control_output_properties *properties)
{
/* TODO: this should be more dynamic */
if (properties->handle > 2)
return -EINVAL;
switch (properties->handle) {
case 0:
properties->type = TEGRA_DC_EXT_LVDS;
properties->connected = 1;
break;
case 1:
properties->type = TEGRA_DC_EXT_HDMI;
properties->connected = 1;
break;
default:
return -EINVAL;
}
properties->associated_head = properties->handle;
return 0;
}
static int get_output_edid(struct tegra_dc_ext_control_output_edid *edid)
{
/* XXX implement me */
return -ENOTSUPP;
}
static int set_event_mask(struct tegra_dc_ext_control_user *user, u32 mask)
{
struct list_head *list, *tmp;
if (mask & ~TEGRA_DC_EXT_EVENT_MASK_ALL)
return -EINVAL;
mutex_lock(&user->lock);
user->event_mask = mask;
list_for_each_safe(list, tmp, &user->event_list) {
struct tegra_dc_ext_event_list *ev_list;
ev_list = list_entry(list, struct tegra_dc_ext_event_list,
list);
if (!(mask & ev_list->event.type)) {
list_del(list);
kfree(ev_list);
}
}
mutex_unlock(&user->lock);
return 0;
}
static long tegra_dc_ext_control_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
void __user *user_arg = (void __user *)arg;
struct tegra_dc_ext_control_user *user = filp->private_data;
switch (cmd) {
case TEGRA_DC_EXT_CONTROL_GET_NUM_OUTPUTS:
{
u32 num = tegra_dc_ext_get_num_outputs();
if (copy_to_user(user_arg, &num, sizeof(num)))
return -EFAULT;
return 0;
}
case TEGRA_DC_EXT_CONTROL_GET_OUTPUT_PROPERTIES:
{
struct tegra_dc_ext_control_output_properties args;
int ret;
if (copy_from_user(&args, user_arg, sizeof(args)))
return -EFAULT;
ret = get_output_properties(&args);
if (copy_to_user(user_arg, &args, sizeof(args)))
return -EFAULT;
return ret;
}
case TEGRA_DC_EXT_CONTROL_GET_OUTPUT_EDID:
{
struct tegra_dc_ext_control_output_edid args;
int ret;
if (copy_from_user(&args, user_arg, sizeof(args)))
return -EFAULT;
ret = get_output_edid(&args);
if (copy_to_user(user_arg, &args, sizeof(args)))
return -EFAULT;
return ret;
}
case TEGRA_DC_EXT_CONTROL_SET_EVENT_MASK:
return set_event_mask(user, (u32) arg);
default:
return -EINVAL;
}
}
static int tegra_dc_ext_control_open(struct inode *inode, struct file *filp)
{
struct tegra_dc_ext_control_user *user;
struct tegra_dc_ext_control *control;
user = kzalloc(sizeof(*user), GFP_KERNEL);
if (!user)
return -ENOMEM;
control = container_of(inode->i_cdev, struct tegra_dc_ext_control,
cdev);
user->control = control;;
INIT_LIST_HEAD(&user->event_list);
mutex_init(&user->lock);
filp->private_data = user;
mutex_lock(&control->lock);
list_add(&user->list, &control->users);
mutex_unlock(&control->lock);
return 0;
}
static int tegra_dc_ext_control_release(struct inode *inode, struct file *filp)
{
struct tegra_dc_ext_control_user *user = filp->private_data;
struct tegra_dc_ext_control *control = user->control;
/* This will free any pending events for this user */
set_event_mask(user, 0);
mutex_lock(&control->lock);
list_del(&user->list);
mutex_unlock(&control->lock);
kfree(user);
return 0;
}
static const struct file_operations tegra_dc_ext_event_devops = {
.owner = THIS_MODULE,
.open = tegra_dc_ext_control_open,
.release = tegra_dc_ext_control_release,
.read = tegra_dc_ext_event_read,
.unlocked_ioctl = tegra_dc_ext_control_ioctl,
};
int tegra_dc_ext_control_init(void)
{
struct tegra_dc_ext_control *control = &g_control;
int ret;
cdev_init(&control->cdev, &tegra_dc_ext_event_devops);
control->cdev.owner = THIS_MODULE;
ret = cdev_add(&control->cdev, tegra_dc_ext_devno, 1);
if (ret)
return ret;
control->dev = device_create(tegra_dc_ext_class,
NULL,
tegra_dc_ext_devno,
NULL,
"tegra_dc_ctrl");
if (IS_ERR(control->dev)) {
ret = PTR_ERR(control->dev);
cdev_del(&control->cdev);
}
mutex_init(&control->lock);
INIT_LIST_HEAD(&control->users);
return ret;
}
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