/*
 * Core MDSS framebuffer driver.
 *
 * Copyright (C) 2007 Google Incorporated
 * Copyright (c) 2008-2014, The Linux Foundation. All rights reserved.
 *
 * 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.
 */

#define pr_fmt(fmt)	"%s: " fmt, __func__

#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "mdss_fb.h"

#ifdef CONFIG_FB_MSM_TRIPLE_BUFFER
#define MDSS_FB_NUM 3
#else
#define MDSS_FB_NUM 2
#endif

#ifndef EXPORT_COMPAT
#define EXPORT_COMPAT(x)
#endif

#define MAX_FBI_LIST 32

#define BLANK_FLAG_LP	FB_BLANK_VSYNC_SUSPEND
#define BLANK_FLAG_ULP	FB_BLANK_NORMAL

#define DEFERRED_IO_REFRESH_RATE	25
#define DEFERRED_IO_DELAY		(HZ / DEFERRED_IO_REFRESH_RATE)

enum {
	MDP_RGB_565,      /* RGB 565 planer */
	MDP_XRGB_8888,    /* RGB 888 padded */
	MDP_ARGB_8888,    /* ARGB 888 */
	MDP_RGB_888,      /* RGB 888 planer */
	MDP_RGBA_8888,    /* ARGB 888 */
	MDP_BGRA_8888,	  /* ABGR 888 */
	MDP_BGR_565,      /* BGR 565 planer */
};

static struct fb_info *fbi_list[MAX_FBI_LIST];
static int fbi_list_index;

static u32 mdss_fb_pseudo_palette[16] = {
	0x00000000, 0xffffffff, 0xffffffff, 0xffffffff,
	0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
	0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
	0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff
};

static struct msm_mdp_interface *mdp_instance;
static struct fb_deferred_io mdss_fb_defio;

static int mdss_fb_register(struct msm_fb_data_type *mfd);
static int mdss_fb_open(struct fb_info *info, int user);
static int mdss_fb_release(struct fb_info *info, int user);
static int mdss_fb_release_all(struct fb_info *info, bool release_all);
static int mdss_fb_pan_display(struct fb_var_screeninfo *var,
			       struct fb_info *info);
static int mdss_fb_check_var(struct fb_var_screeninfo *var,
			     struct fb_info *info);
static int mdss_fb_set_par(struct fb_info *info);
static int mdss_fb_blank_sub(int blank_mode, struct fb_info *info,
			     int op_enable);
static int mdss_fb_suspend_sub(struct msm_fb_data_type *mfd);

static void mdss_fb_shutdown(struct platform_device *pdev)
{
	struct msm_fb_data_type *mfd = platform_get_drvdata(pdev);

	lock_fb_info(mfd->fbi);
	mdss_fb_release_all(mfd->fbi, true);
	unlock_fb_info(mfd->fbi);
}

static int mdss_fb_probe(struct platform_device *pdev)
{
	struct msm_fb_data_type *mfd = NULL;
	struct mdss_panel_data *pdata;
	struct fb_info *fbi;
	int rc;

	if (fbi_list_index >= MAX_FBI_LIST)
		return -ENOMEM;

	pdata = dev_get_platdata(&pdev->dev);
	if (!pdata)
		return -EPROBE_DEFER;

	/*
	 * alloc framebuffer info + par data
	 */
	fbi = framebuffer_alloc(sizeof(struct msm_fb_data_type), NULL);
	if (fbi == NULL) {
		pr_err("can't allocate framebuffer info data!\n");
		return -ENOMEM;
	}

	mfd = (struct msm_fb_data_type *)fbi->par;
	mfd->key = MFD_KEY;
	mfd->fbi = fbi;
	mfd->panel_info = &pdata->panel_info;
	mfd->panel.type = pdata->panel_info.type;
	mfd->panel.id = mfd->index;
	mfd->fb_page = MDSS_FB_NUM;
	mfd->index = fbi_list_index;

	mfd->fb_imgType = MDP_RGBA_8888;

	mfd->fbi->fbdefio = &mdss_fb_defio;
	mfd->pdev = pdev;

	mfd->mdp = *mdp_instance;

	fbi_list[fbi_list_index++] = fbi;

	platform_set_drvdata(pdev, mfd);

	rc = mdss_fb_register(mfd);
	if (rc)
		return rc;

	if (mfd->mdp.init_fnc) {
		rc = mfd->mdp.init_fnc(mfd);
		if (rc) {
			pr_err("init_fnc failed\n");
			return rc;
		}
	}

	rc = pm_runtime_set_active(mfd->fbi->dev);
	if (rc < 0)
		pr_err("pm_runtime: fail to set active.\n");
	pm_runtime_enable(mfd->fbi->dev);

	return rc;
}

static int mdss_fb_remove(struct platform_device *pdev)
{
	struct msm_fb_data_type *mfd;

	mfd = (struct msm_fb_data_type *)platform_get_drvdata(pdev);

	if (!mfd)
		return -ENODEV;

	pm_runtime_disable(mfd->fbi->dev);

	if (mfd->key != MFD_KEY)
		return -EINVAL;

	if (mdss_fb_suspend_sub(mfd))
		pr_err("msm_fb_remove: can't stop the device %d\n",
			    mfd->index);

	fb_deferred_io_cleanup(mfd->fbi);
	/* remove /dev/fb* */
	unregister_framebuffer(mfd->fbi);

	return 0;
}

static int mdss_fb_suspend_sub(struct msm_fb_data_type *mfd)
{
	int ret = 0;

	if ((!mfd) || (mfd->key != MFD_KEY))
		return 0;

	pr_debug("mdss_fb suspend index=%d\n", mfd->index);

	mfd->suspend.op_enable = mfd->op_enable;
	mfd->suspend.panel_power_state = mfd->panel_power_state;

	if (mfd->op_enable) {
		/*
		 * Ideally, display should have either been blanked by now, or
		 * should have transitioned to a low power state. If not, then
		 * as a fall back option, enter ulp state to leave the display
		 * on, but turn off all interface clocks.
		 */
		if (mdss_fb_is_power_on(mfd)) {
			ret = mdss_fb_blank_sub(BLANK_FLAG_ULP, mfd->fbi,
					mfd->suspend.op_enable);
			if (ret) {
				pr_err("can't turn off display!\n");
				return ret;
			}
		}
		mfd->op_enable = false;
		fb_set_suspend(mfd->fbi, FBINFO_STATE_SUSPENDED);
	}

	return 0;
}

static int mdss_fb_resume_sub(struct msm_fb_data_type *mfd)
{
	int ret = 0;

	if ((!mfd) || (mfd->key != MFD_KEY))
		return 0;

	pr_debug("mdss_fb resume index=%d\n", mfd->index);

	/* resume state var recover */
	mfd->op_enable = mfd->suspend.op_enable;

	/*
	 * If the fb was explicitly blanked or transitioned to ulp during
	 * suspend, then undo it during resume with the appropriate unblank
	 * flag. If fb was in ulp state when entering suspend, then nothing
	 * needs to be done.
	 */
	if (mdss_panel_is_power_on(mfd->suspend.panel_power_state) &&
		!mdss_panel_is_power_on_ulp(mfd->suspend.panel_power_state)) {
		int unblank_flag = mdss_panel_is_power_on_interactive(
			mfd->suspend.panel_power_state) ? FB_BLANK_UNBLANK :
			BLANK_FLAG_LP;

		ret = mdss_fb_blank_sub(unblank_flag, mfd->fbi, mfd->op_enable);
		if (ret)
			pr_warn("can't turn on display!\n");
		else
			fb_set_suspend(mfd->fbi, FBINFO_STATE_RUNNING);
	}

	return ret;
}

#if defined(CONFIG_PM) && !defined(CONFIG_PM_SLEEP)
static int mdss_fb_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct msm_fb_data_type *mfd = platform_get_drvdata(pdev);
	if (!mfd)
		return -ENODEV;

	dev_dbg(&pdev->dev, "display suspend\n");

	return mdss_fb_suspend_sub(mfd);
}

static int mdss_fb_resume(struct platform_device *pdev)
{
	struct msm_fb_data_type *mfd = platform_get_drvdata(pdev);
	if (!mfd)
		return -ENODEV;

	dev_dbg(&pdev->dev, "display resume\n");

	return mdss_fb_resume_sub(mfd);
}
#else
#define mdss_fb_suspend NULL
#define mdss_fb_resume NULL
#endif

#ifdef CONFIG_PM_SLEEP
static int mdss_fb_pm_suspend(struct device *dev)
{
	struct msm_fb_data_type *mfd = dev_get_drvdata(dev);

	if (!mfd)
		return -ENODEV;

	dev_dbg(dev, "display pm suspend\n");

	return mdss_fb_suspend_sub(mfd);
}

static int mdss_fb_pm_resume(struct device *dev)
{
	struct msm_fb_data_type *mfd = dev_get_drvdata(dev);
	if (!mfd)
		return -ENODEV;

	dev_dbg(dev, "display pm resume\n");

	/*
	 * It is possible that the runtime status of the fb device may
	 * have been active when the system was suspended. Reset the runtime
	 * status to suspended state after a complete system resume.
	 */
	pm_runtime_disable(dev);
	pm_runtime_set_suspended(dev);
	pm_runtime_enable(dev);

	return mdss_fb_resume_sub(mfd);
}
#endif

static const struct dev_pm_ops mdss_fb_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(mdss_fb_pm_suspend, mdss_fb_pm_resume)
};

static const struct of_device_id mdss_fb_dt_match[] = {
	{ .compatible = "qcom,mdss-fb",},
	{}
};
EXPORT_COMPAT("qcom,mdss-fb");

static struct platform_driver mdss_fb_driver = {
	.probe = mdss_fb_probe,
	.remove = mdss_fb_remove,
	.suspend = mdss_fb_suspend,
	.resume = mdss_fb_resume,
	.shutdown = mdss_fb_shutdown,
	.driver = {
		.name = "mdss_fb",
		.of_match_table = mdss_fb_dt_match,
		.pm = &mdss_fb_pm_ops,
	},
};

static int mdss_fb_blank_blank(struct msm_fb_data_type *mfd,
	int req_power_state)
{
	int ret = 0;
	int cur_power_state;

	if (!mfd)
		return -EINVAL;

	if (!mdss_fb_is_power_on(mfd) || !mfd->mdp.off_fnc)
		return 0;

	cur_power_state = mfd->panel_power_state;

	pr_debug("Transitioning from %d --> %d\n", cur_power_state,
		req_power_state);

	if (cur_power_state == req_power_state) {
		pr_debug("No change in power state\n");
		return 0;
	}

	mfd->op_enable = false;
	mfd->panel_power_state = req_power_state;

	ret = mfd->mdp.off_fnc(mfd);
	if (ret)
		mfd->panel_power_state = cur_power_state;
	mfd->op_enable = true;

	return ret;
}

static int mdss_fb_blank_unblank(struct msm_fb_data_type *mfd)
{
	int ret = 0;
	int cur_power_state;

	if (!mfd)
		return -EINVAL;

	cur_power_state = mfd->panel_power_state;
	pr_debug("Transitioning from %d --> %d\n", cur_power_state,
		MDSS_PANEL_POWER_ON);

	if (mdss_panel_is_power_on_interactive(cur_power_state)) {
		pr_debug("No change in power state\n");
		return 0;
	}

	if (mfd->mdp.on_fnc) {
		ret = mfd->mdp.on_fnc(mfd);
		if (ret)
			goto error;

		mfd->panel_power_state = MDSS_PANEL_POWER_ON;
		mfd->panel_info->panel_dead = false;

	}

error:
	return ret;
}

static int mdss_fb_blank_sub(int blank_mode, struct fb_info *info,
			     int op_enable)
{
	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)info->par;
	int ret = 0;
	int cur_power_state, req_power_state = MDSS_PANEL_POWER_OFF;

	if (!mfd || !op_enable)
		return -EPERM;

	pr_debug("%pS mode:%d\n", __builtin_return_address(0),
		blank_mode);

	cur_power_state = mfd->panel_power_state;

	switch (blank_mode) {
	case FB_BLANK_UNBLANK:
		pr_debug("unblank called. cur pwr state=%d\n", cur_power_state);
		ret = mdss_fb_blank_unblank(mfd);
		break;
	case BLANK_FLAG_ULP:
		req_power_state = MDSS_PANEL_POWER_LP2;
		pr_debug("ultra low power mode requested\n");
		if (mdss_fb_is_power_off(mfd)) {
			pr_debug("Unsupp transition: off --> ulp\n");
			return 0;
		}

		ret = mdss_fb_blank_blank(mfd, req_power_state);
		break;
	case BLANK_FLAG_LP:
		req_power_state = MDSS_PANEL_POWER_LP1;
		pr_debug(" power mode requested\n");

		/*
		 * If low power mode is requested when panel is already off,
		 * then first unblank the panel before entering low power mode
		 */
		if (mdss_fb_is_power_off(mfd) && mfd->mdp.on_fnc) {
			pr_debug("off --> lp. switch to on first\n");
			ret = mdss_fb_blank_unblank(mfd);
			if (ret)
				break;
		}

		ret = mdss_fb_blank_blank(mfd, req_power_state);
		break;
	case FB_BLANK_HSYNC_SUSPEND:
	case FB_BLANK_POWERDOWN:
	default:
		req_power_state = MDSS_PANEL_POWER_OFF;
		pr_debug("blank powerdown called\n");
		ret = mdss_fb_blank_blank(mfd, req_power_state);
		break;
	}

	return ret;
}

static void mdss_fb_deferred_io(struct fb_info *info,
				struct list_head *pagelist)
{
	mdss_fb_pan_display(&info->var, info);
}

static int mdss_fb_blank(int blank_mode, struct fb_info *info)
{
	struct mdss_panel_data *pdata;
	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)info->par;

	if (mfd->op_enable == 0) {
		if (blank_mode == FB_BLANK_UNBLANK)
			mfd->suspend.panel_power_state = MDSS_PANEL_POWER_ON;
		else if (blank_mode == BLANK_FLAG_ULP)
			mfd->suspend.panel_power_state = MDSS_PANEL_POWER_LP2;
		else if (blank_mode == BLANK_FLAG_LP)
			mfd->suspend.panel_power_state = MDSS_PANEL_POWER_LP1;
		else
			mfd->suspend.panel_power_state = MDSS_PANEL_POWER_OFF;
		return 0;
	}
	pr_debug("mode: %d\n", blank_mode);

	pdata = dev_get_platdata(&mfd->pdev->dev);

	if (pdata->panel_info.is_lpm_mode &&
			blank_mode == FB_BLANK_UNBLANK) {
		pr_debug("panel is in lpm mode\n");
		mfd->mdp.configure_panel(mfd, 0);
		pdata->panel_info.is_lpm_mode = false;
	}

	return mdss_fb_blank_sub(blank_mode, info, mfd->op_enable);
}

static int mdss_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{

	return dma_mmap_coherent(info->dev, vma,
				     info->screen_base,
				     info->fix.smem_start,
				     info->fix.smem_len);
}

static struct fb_ops mdss_fb_ops = {
	.owner = THIS_MODULE,
	.fb_open = mdss_fb_open,
	.fb_release = mdss_fb_release,
	.fb_check_var = mdss_fb_check_var,	/* vinfo check */
	.fb_set_par = mdss_fb_set_par,	/* set the video mode */
	.fb_blank = mdss_fb_blank,	/* blank display */
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_mmap = mdss_fb_mmap,
};

static struct fb_deferred_io mdss_fb_defio = {
	.delay		= DEFERRED_IO_DELAY,
	.deferred_io	= mdss_fb_deferred_io,
};

static int mdss_fb_alloc_fbmem(struct msm_fb_data_type *mfd)
{

	if (mfd->mdp.fb_mem_alloc_fnc) {
		return mfd->mdp.fb_mem_alloc_fnc(mfd);
	} else {
		pr_err("no fb memory allocator function defined\n");
		return -ENOMEM;
	}
}

static int mdss_fb_register(struct msm_fb_data_type *mfd)
{
	int ret = -ENODEV;
	int bpp;
	struct mdss_panel_info *panel_info = mfd->panel_info;
	struct fb_info *fbi = mfd->fbi;
	struct fb_fix_screeninfo *fix;
	struct fb_var_screeninfo *var;
	int *id;

	/*
	 * fb info initialization
	 */
	fix = &fbi->fix;
	var = &fbi->var;

	fix->type_aux = 0;	/* if type == FB_TYPE_INTERLEAVED_PLANES */
	fix->visual = FB_VISUAL_TRUECOLOR;	/* True Color */
	fix->ywrapstep = 0;	/* No support */
	fix->mmio_start = 0;	/* No MMIO Address */
	fix->mmio_len = 0;	/* No MMIO Address */
	fix->accel = FB_ACCEL_NONE;/* FB_ACCEL_MSM needes to be added in fb.h */

	var->xoffset = 0,	/* Offset from virtual to visible */
	var->yoffset = 0,	/* resolution */
	var->grayscale = 0,	/* No graylevels */
	var->nonstd = 0,	/* standard pixel format */
	var->activate = FB_ACTIVATE_VBL,	/* activate it at vsync */
	var->height = -1,	/* height of picture in mm */
	var->width = -1,	/* width of picture in mm */
	var->accel_flags = 0,	/* acceleration flags */
	var->sync = 0,	/* see FB_SYNC_* */
	var->rotate = 0,	/* angle we rotate counter clockwise */
	mfd->op_enable = false;

	switch (mfd->fb_imgType) {
	case MDP_RGB_565:
		fix->type = FB_TYPE_PACKED_PIXELS;
		fix->xpanstep = 1;
		fix->ypanstep = 1;
		var->vmode = FB_VMODE_NONINTERLACED;
		var->blue.offset = 0;
		var->green.offset = 5;
		var->red.offset = 11;
		var->blue.length = 5;
		var->green.length = 6;
		var->red.length = 5;
		var->blue.msb_right = 0;
		var->green.msb_right = 0;
		var->red.msb_right = 0;
		var->transp.offset = 0;
		var->transp.length = 0;
		bpp = 2;
		break;

	case MDP_RGB_888:
		fix->type = FB_TYPE_PACKED_PIXELS;
		fix->xpanstep = 1;
		fix->ypanstep = 1;
		var->vmode = FB_VMODE_NONINTERLACED;
		var->blue.offset = 0;
		var->green.offset = 8;
		var->red.offset = 16;
		var->blue.length = 8;
		var->green.length = 8;
		var->red.length = 8;
		var->blue.msb_right = 0;
		var->green.msb_right = 0;
		var->red.msb_right = 0;
		var->transp.offset = 0;
		var->transp.length = 0;
		bpp = 3;
		break;

	case MDP_ARGB_8888:
		fix->type = FB_TYPE_PACKED_PIXELS;
		fix->xpanstep = 1;
		fix->ypanstep = 1;
		var->vmode = FB_VMODE_NONINTERLACED;
		var->blue.offset = 24;
		var->green.offset = 16;
		var->red.offset = 8;
		var->blue.length = 8;
		var->green.length = 8;
		var->red.length = 8;
		var->blue.msb_right = 0;
		var->green.msb_right = 0;
		var->red.msb_right = 0;
		var->transp.offset = 0;
		var->transp.length = 8;
		bpp = 4;
		break;

	case MDP_RGBA_8888:
		fix->type = FB_TYPE_PACKED_PIXELS;
		fix->xpanstep = 1;
		fix->ypanstep = 1;
		var->vmode = FB_VMODE_NONINTERLACED;
		var->blue.offset = 16;
		var->green.offset = 8;
		var->red.offset = 0;
		var->blue.length = 8;
		var->green.length = 8;
		var->red.length = 8;
		var->blue.msb_right = 0;
		var->green.msb_right = 0;
		var->red.msb_right = 0;
		var->transp.offset = 24;
		var->transp.length = 8;
		bpp = 4;
		break;

	default:
		pr_err("msm_fb_init: fb %d unkown image type!\n",
			    mfd->index);
		return ret;
	}

	var->xres = panel_info->xres;

	fix->type = panel_info->is_3d_panel;
	if (mfd->mdp.fb_stride)
		fix->line_length = mfd->mdp.fb_stride(mfd->index, var->xres,
							bpp);
	else
		fix->line_length = var->xres * bpp;

	var->yres = panel_info->yres;
	if (panel_info->physical_width)
		var->width = panel_info->physical_width;
	if (panel_info->physical_height)
		var->height = panel_info->physical_height;
	var->xres_virtual = var->xres;
	var->yres_virtual = panel_info->yres * mfd->fb_page;
	var->bits_per_pixel = bpp * 8;	/* FrameBuffer color depth */
	var->upper_margin = panel_info->lcdc.v_back_porch;
	var->lower_margin = panel_info->lcdc.v_front_porch;
	var->vsync_len = panel_info->lcdc.v_pulse_width;
	var->left_margin = panel_info->lcdc.h_back_porch;
	var->right_margin = panel_info->lcdc.h_front_porch;
	var->hsync_len = panel_info->lcdc.h_pulse_width;
	var->pixclock = panel_info->clk_rate / 1000;

	/*
	 * Populate smem length here for uspace to get the
	 * Framebuffer size when FBIO_FSCREENINFO ioctl is
	 * called.
	 */
	fix->smem_len = PAGE_ALIGN(fix->line_length * var->yres) * mfd->fb_page;

	/* id field for fb app  */
	id = (int *)&mfd->panel;

	snprintf(fix->id, sizeof(fix->id), "mdssfb_%x", (u32) *id);

	fbi->fbops = &mdss_fb_ops;
	fbi->flags = FBINFO_FLAG_DEFAULT | FBINFO_DMAFB;
	fbi->pseudo_palette = mdss_fb_pseudo_palette;

	mfd->ref_cnt = 0;
	mfd->panel_power_state = MDSS_PANEL_POWER_OFF;

	if (mdss_fb_alloc_fbmem(mfd))
		pr_warn("unable to allocate fb memory in fb register\n");

	mfd->op_enable = true;

	fb_deferred_io_init(mfd->fbi);
	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
	if (ret)
		pr_err("fb_alloc_cmap() failed!\n");

	if (register_framebuffer(fbi) < 0) {
		fb_dealloc_cmap(&fbi->cmap);

		mfd->op_enable = false;
		return -EPERM;
	}

	pr_info("FrameBuffer[%d] %dx%d registered successfully!\n", mfd->index,
					fbi->var.xres, fbi->var.yres);

	return 0;
}

static int mdss_fb_open(struct fb_info *info, int user)
{
	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)info->par;
	int result;


	result = pm_runtime_get_sync(info->dev);

	if (result < 0) {
		pr_err("pm_runtime: fail to wake up\n");
		goto pm_error;
	}

	if (!mfd->ref_cnt) {
		result = mdss_fb_blank_sub(FB_BLANK_UNBLANK, info,
					   mfd->op_enable);
		if (result) {
			pr_err("can't turn on fb%d! rc=%d\n", mfd->index,
				result);
			goto blank_error;
		}
	}

	mfd->ref_cnt++;

	return 0;

blank_error:
	pm_runtime_put(info->dev);

pm_error:
	return result;
}

static int mdss_fb_release_all(struct fb_info *info, bool release_all)
{
	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)info->par;
	int ret = 0;
	bool release_needed = false;

	if (!mfd->ref_cnt) {
		pr_info("try to close unopened fb %d!\n", mfd->index);
		return -EINVAL;
	}

	pr_debug("release_all = %s\n", release_all ? "true" : "false");

	mfd->ref_cnt--;

	if (!mfd->ref_cnt || release_all) {
		/* resources (if any) will be released during blank */
		if (mfd->mdp.release_fnc)
			mfd->mdp.release_fnc(mfd, true);

		ret = mdss_fb_blank_sub(FB_BLANK_POWERDOWN, info,
			mfd->op_enable);
		if (ret) {
			pr_err("can't turn off fb%d!\n", ret);
			return ret;
		}
	} else if (release_needed) {
		if (mfd->mdp.release_fnc) {
			ret = mfd->mdp.release_fnc(mfd, false);

			/* display commit is needed to release resources */
			if (ret)
				mdss_fb_pan_display(&mfd->fbi->var, mfd->fbi);
		}
	}

	return ret;
}

static int mdss_fb_release(struct fb_info *info, int user)
{
	return mdss_fb_release_all(info, false);
}

static int mdss_fb_pan_display_sub(struct fb_var_screeninfo *var,
			       struct fb_info *info)
{
	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)info->par;

	if (!mfd->op_enable)
		return -EPERM;

	if (var->xoffset > (info->var.xres_virtual - info->var.xres))
		return -EINVAL;

	if (var->yoffset > (info->var.yres_virtual - info->var.yres))
		return -EINVAL;

	if (info->fix.xpanstep)
		info->var.xoffset =
		(var->xoffset / info->fix.xpanstep) * info->fix.xpanstep;

	if (info->fix.ypanstep)
		info->var.yoffset =
		(var->yoffset / info->fix.ypanstep) * info->fix.ypanstep;

	if (mfd->mdp.dma_fnc)
		mfd->mdp.dma_fnc(mfd);
	else
		pr_warn("dma function not set for panel type=%d\n",
				mfd->panel.type);

	return 0;
}

static int mdss_fb_pan_display(struct fb_var_screeninfo *var,
		struct fb_info *info)
{
	return mdss_fb_pan_display_sub(var, info);
}

static void mdss_fb_var_to_panelinfo(struct fb_var_screeninfo *var,
	struct mdss_panel_info *pinfo)
{
	pinfo->xres = var->xres;
	pinfo->yres = var->yres;
	pinfo->lcdc.v_front_porch = var->lower_margin;
	pinfo->lcdc.v_back_porch = var->upper_margin;
	pinfo->lcdc.v_pulse_width = var->vsync_len;
	pinfo->lcdc.h_front_porch = var->right_margin;
	pinfo->lcdc.h_back_porch = var->left_margin;
	pinfo->lcdc.h_pulse_width = var->hsync_len;
	pinfo->clk_rate = var->pixclock;
}

static int mdss_fb_check_var(struct fb_var_screeninfo *var,
			     struct fb_info *info)
{
	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)info->par;

	if (var->rotate != FB_ROTATE_UR)
		return -EINVAL;
	if (var->grayscale != info->var.grayscale)
		return -EINVAL;

	switch (var->bits_per_pixel) {
	case 16:
		if ((var->green.offset != 5) ||
		    !((var->blue.offset == 11)
		      || (var->blue.offset == 0)) ||
		    !((var->red.offset == 11)
		      || (var->red.offset == 0)) ||
		    (var->blue.length != 5) ||
		    (var->green.length != 6) ||
		    (var->red.length != 5) ||
		    (var->blue.msb_right != 0) ||
		    (var->green.msb_right != 0) ||
		    (var->red.msb_right != 0) ||
		    (var->transp.offset != 0) ||
		    (var->transp.length != 0))
			return -EINVAL;
		break;

	case 24:
		if ((var->blue.offset != 0) ||
		    (var->green.offset != 8) ||
		    (var->red.offset != 16) ||
		    (var->blue.length != 8) ||
		    (var->green.length != 8) ||
		    (var->red.length != 8) ||
		    (var->blue.msb_right != 0) ||
		    (var->green.msb_right != 0) ||
		    (var->red.msb_right != 0) ||
		    !(((var->transp.offset == 0) &&
		       (var->transp.length == 0)) ||
		      ((var->transp.offset == 24) &&
		       (var->transp.length == 8))))
			return -EINVAL;
		break;

	case 32:
		/* Check user specified color format BGRA/ARGB/RGBA
		   and verify the position of the RGB components */

		if (!((var->transp.offset == 24) &&
			(var->blue.offset == 0) &&
			(var->green.offset == 8) &&
			(var->red.offset == 16)) &&
		    !((var->transp.offset == 24) &&
			(var->blue.offset == 16) &&
			(var->green.offset == 8) &&
			(var->red.offset == 0)))
				return -EINVAL;

		/* Check the common values for both RGBA and ARGB */

		if ((var->blue.length != 8) ||
		    (var->green.length != 8) ||
		    (var->red.length != 8) ||
		    (var->transp.length != 8) ||
		    (var->blue.msb_right != 0) ||
		    (var->green.msb_right != 0) ||
		    (var->red.msb_right != 0))
			return -EINVAL;

		break;

	default:
		return -EINVAL;
	}

	if ((var->xres_virtual <= 0) || (var->yres_virtual <= 0))
		return -EINVAL;

	if (info->fix.smem_start) {
		u32 len = var->xres_virtual * var->yres_virtual *
			(var->bits_per_pixel / 8);
		if (len > info->fix.smem_len)
			return -EINVAL;
	}

	if ((var->xres == 0) || (var->yres == 0))
		return -EINVAL;

	if (var->xoffset > (var->xres_virtual - var->xres))
		return -EINVAL;

	if (var->yoffset > (var->yres_virtual - var->yres))
		return -EINVAL;

	if (mfd->panel_info) {
		struct mdss_panel_info panel_info;

		memcpy(&panel_info, mfd->panel_info, sizeof(panel_info));
		mdss_fb_var_to_panelinfo(var, &panel_info);
		mfd->panel_reconfig = true;
	}

	return 0;
}

static int mdss_fb_set_par(struct fb_info *info)
{
	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)info->par;
	struct fb_var_screeninfo *var = &info->var;
	int old_imgType;

	old_imgType = mfd->fb_imgType;
	switch (var->bits_per_pixel) {
	case 16:
		if (var->red.offset == 0)
			mfd->fb_imgType = MDP_BGR_565;
		else
			mfd->fb_imgType	= MDP_RGB_565;
		break;

	case 24:
		if ((var->transp.offset == 0) && (var->transp.length == 0))
			mfd->fb_imgType = MDP_RGB_888;
		else if ((var->transp.offset == 24) &&
			 (var->transp.length == 8)) {
			mfd->fb_imgType = MDP_ARGB_8888;
			info->var.bits_per_pixel = 32;
		}
		break;

	case 32:
		if ((var->red.offset == 0) &&
		    (var->green.offset == 8) &&
		    (var->blue.offset == 16) &&
		    (var->transp.offset == 24))
			mfd->fb_imgType = MDP_RGBA_8888;
		else if ((var->red.offset == 16) &&
		    (var->green.offset == 8) &&
		    (var->blue.offset == 0) &&
		    (var->transp.offset == 24))
			mfd->fb_imgType = MDP_BGRA_8888;
		else if ((var->red.offset == 8) &&
		    (var->green.offset == 16) &&
		    (var->blue.offset == 24) &&
		    (var->transp.offset == 0))
			mfd->fb_imgType = MDP_ARGB_8888;
		else
			mfd->fb_imgType = MDP_RGBA_8888;
		break;

	default:
		return -EINVAL;
	}


	if (mfd->mdp.fb_stride)
		mfd->fbi->fix.line_length = mfd->mdp.fb_stride(mfd->index,
						var->xres,
						var->bits_per_pixel / 8);
	else
		mfd->fbi->fix.line_length = var->xres * var->bits_per_pixel / 8;

	mfd->fbi->fix.smem_len = PAGE_ALIGN(mfd->fbi->fix.line_length *
					mfd->fbi->var.yres) * mfd->fb_page;

	if (mfd->panel_reconfig || (mfd->fb_imgType != old_imgType)) {
		mdss_fb_blank_sub(FB_BLANK_POWERDOWN, info, mfd->op_enable);
		mdss_fb_var_to_panelinfo(var, mfd->panel_info);
		mdss_fb_blank_sub(FB_BLANK_UNBLANK, info, mfd->op_enable);
		mfd->panel_reconfig = false;
	}

	return 0;
}

static int mdss_fb_register_extra_panel(struct platform_device *pdev,
	struct mdss_panel_data *pdata)
{
	struct mdss_panel_data *fb_pdata;

	fb_pdata = dev_get_platdata(&pdev->dev);
	if (!fb_pdata) {
		pr_err("framebuffer device %s contains invalid panel data\n",
				dev_name(&pdev->dev));
		return -EINVAL;
	}

	if (fb_pdata->next) {
		pr_err("split panel already setup for framebuffer device %s\n",
				dev_name(&pdev->dev));
		return -EEXIST;
	}

	fb_pdata->next = pdata;

	return 0;
}

int mdss_register_panel(struct platform_device *pdev,
	struct mdss_panel_data *pdata)
{
	struct platform_device *fb_pdev, *mdss_pdev;
	struct device_node *node;
	int rc = 0;
	bool master_panel = true;

	if (!pdev || !pdev->dev.of_node) {
		pr_err("Invalid device node\n");
		return -ENODEV;
	}

	if (!mdp_instance) {
		pr_err("mdss mdp resource not initialized yet\n");
		return -EPROBE_DEFER;
	}

	node = of_parse_phandle(pdev->dev.of_node, "qcom,mdss-fb-map", 0);
	if (!node) {
		pr_err("Unable to find fb node for device: %s\n",
				pdev->name);
		return -ENODEV;
	}
	mdss_pdev = of_find_device_by_node(node->parent);
	if (!mdss_pdev) {
		pr_err("Unable to find mdss for node: %s\n", node->full_name);
		rc = -ENODEV;
		goto mdss_notfound;
	}

	fb_pdev = of_find_device_by_node(node);
	if (fb_pdev) {
		rc = mdss_fb_register_extra_panel(fb_pdev, pdata);
		if (rc == 0)
			master_panel = false;
	} else {
		pr_info("adding framebuffer device %s\n", dev_name(&pdev->dev));
		fb_pdev = of_platform_device_create(node, NULL,
				&mdss_pdev->dev);
		if (fb_pdev)
			fb_pdev->dev.platform_data = pdata;
	}

	if (master_panel && mdp_instance->panel_register_done)
		mdp_instance->panel_register_done(pdata);

mdss_notfound:
	of_node_put(node);
	return rc;
}
EXPORT_SYMBOL(mdss_register_panel);

int mdss_fb_register_mdp_instance(struct msm_mdp_interface *mdp)
{
	if (mdp_instance) {
		pr_err("multiple MDP instance registration\n");
		return -EINVAL;
	}

	mdp_instance = mdp;
	return 0;
}
EXPORT_SYMBOL(mdss_fb_register_mdp_instance);

int mdss_fb_get_phys_info(dma_addr_t *start, unsigned long *len, int fb_num)
{
	struct fb_info *info;
	struct msm_fb_data_type *mfd;

	if (fb_num >= MAX_FBI_LIST)
		return -EINVAL;

	info = fbi_list[fb_num];
	if (!info)
		return -ENOENT;

	mfd = (struct msm_fb_data_type *)info->par;
	if (!mfd)
		return -ENODEV;

	*start = info->fix.smem_start;
	*len = info->fix.smem_len;

	return 0;
}
EXPORT_SYMBOL(mdss_fb_get_phys_info);

int __init mdss_fb_init(void)
{
	int rc = -ENODEV;

	if (platform_driver_register(&mdss_fb_driver))
		return rc;

	return 0;
}

module_init(mdss_fb_init);