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/*
* Dynamic Binary Instrumentation Module based on KProbes
* energy/lcd/maru.c
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) Samsung Electronics, 2013
*
* 2013 Vyacheslav Cherkashin <v.cherkashin@samsung.com>
*
*/
#include <kprobe/dbi_kprobes.h>
#include <linux/backlight.h>
#include "lcd_base.h"
static const char path_backlight[] = "/sys/class/backlight/emulator/brightness";
static const char path_backlight_min[] = "/sys/class/backlight/emulator/min_brightness";
static const char path_backlight_max[] = "/sys/class/backlight/emulator/max_brightness";
static const char path_power[] = "/sys/class/lcd/emulator/lcd_power";
static const char *all_path[] = {
path_backlight,
path_backlight_min,
path_backlight_max,
path_power
};
enum {
all_path_cnt = sizeof(all_path) / sizeof(char *)
};
static int maru_check(struct lcd_ops *ops)
{
int i;
for (i = 0; i < all_path_cnt; ++i) {
int ret = read_val(all_path[i]);
if (IS_ERR_VALUE(ret))
return 0;
}
return 1;
}
static unsigned long maru_get_parameter(struct lcd_ops *ops,
enum lcd_parameter_type type)
{
switch (type) {
case LPD_MIN_BRIGHTNESS:
return read_val(path_backlight_min);
case LPD_MAX_BRIGHTNESS:
return read_val(path_backlight_max);
case LPD_BRIGHTNESS:
return read_val(path_backlight);
case LPD_POWER:
return read_val(path_power);
default:
return -EINVAL;
}
}
static int entry_handler_set_backlight(struct kretprobe_instance *ri,
struct pt_regs *regs);
static int ret_handler_set_backlight(struct kretprobe_instance *ri,
struct pt_regs *regs);
static struct kretprobe set_backlight_krp = {
.kp.symbol_name = "marubl_send_intensity",
.entry_handler = entry_handler_set_backlight,
.handler = ret_handler_set_backlight,
.data_size = sizeof(int)
};
static int maru_set(struct lcd_ops *ops)
{
return dbi_register_kretprobe(&set_backlight_krp);
}
static int maru_unset(struct lcd_ops *ops)
{
dbi_unregister_kretprobe(&set_backlight_krp);
return 0;
}
static struct lcd_ops maru_ops = {
.name = "maru",
.check = maru_check,
.set = maru_set,
.unset = maru_unset,
.get = maru_get_parameter
};
struct lcd_ops *LCD_MAKE_FNAME(maru)(void)
{
return &maru_ops;
}
static int entry_handler_set_backlight(struct kretprobe_instance *ri,
struct pt_regs *regs)
{
int *brightness = (int *)ri->data;
struct backlight_device *bd;
bd = (struct backlight_device *)swap_get_karg(regs, 0);
*brightness = bd->props.brightness;
return 0;
}
static int ret_handler_set_backlight(struct kretprobe_instance *ri,
struct pt_regs *regs)
{
int ret = regs_return_value(regs);
int *brightness = (int *)ri->data;
if (!ret && maru_ops.notifier)
maru_ops.notifier(&maru_ops, LAT_BRIGHTNESS,
(void *)*brightness);
return 0;
}
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