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https://github.com/followmsi/android_kernel_google_msm.git
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9bca4ef76a
Ensure that when backlight scaling ratio or backlight level is being changed that the operation execute atomically. This prevents a backlight level change from being overwritten when it interrupts a backlight scale update. CRs-Fixed: 404017 Signed-off-by: Carl Vanderlip <carlv@codeaurora.org> (cherry picked from commit ce328861aa1f4fa489e9abfc9d1e02b13af2ba47) Signed-off-by: Dhivya Subramanian <dthiru@codeaurora.org> (cherry picked from commit 0584596f75f8f2b184b8be1a0479ee61e449acba) Change-Id: Ifb4bd5e823815b51dae38f1b8647b80d21b8ee45 Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/* Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/fb.h>
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#include <linux/string.h>
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#include <linux/version.h>
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#include <linux/backlight.h>
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#include "msm_fb.h"
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static int msm_fb_bl_get_brightness(struct backlight_device *pbd)
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{
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return pbd->props.brightness;
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}
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static int msm_fb_bl_update_status(struct backlight_device *pbd)
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{
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struct msm_fb_data_type *mfd = bl_get_data(pbd);
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__u32 bl_lvl;
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bl_lvl = pbd->props.brightness;
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bl_lvl = mfd->fbi->bl_curve[bl_lvl];
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down(&mfd->sem);
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msm_fb_set_backlight(mfd, bl_lvl);
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up(&mfd->sem);
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return 0;
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}
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static struct backlight_ops msm_fb_bl_ops = {
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.get_brightness = msm_fb_bl_get_brightness,
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.update_status = msm_fb_bl_update_status,
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};
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void msm_fb_config_backlight(struct msm_fb_data_type *mfd)
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{
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struct msm_fb_panel_data *pdata;
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struct backlight_device *pbd;
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struct fb_info *fbi;
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char name[16];
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struct backlight_properties props;
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fbi = mfd->fbi;
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pdata = (struct msm_fb_panel_data *)mfd->pdev->dev.platform_data;
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if ((pdata) && (pdata->set_backlight)) {
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snprintf(name, sizeof(name), "msmfb_bl%d", mfd->index);
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props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
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props.brightness = FB_BACKLIGHT_LEVELS - 1;
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pbd =
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backlight_device_register(name, fbi->dev, mfd,
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&msm_fb_bl_ops, &props);
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if (!IS_ERR(pbd)) {
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fbi->bl_dev = pbd;
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fb_bl_default_curve(fbi,
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0,
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mfd->panel_info.bl_min,
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mfd->panel_info.bl_max);
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} else {
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fbi->bl_dev = NULL;
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printk(KERN_ERR "msm_fb: backlight_device_register failed!\n");
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}
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}
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}
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