ARM: Add support for the display controllers in VT8500 and WM8505 (d6ff7d0f) · Commits · 戴 / test

drivers/video/Kconfig

+26 −0

Original line number	Diff line number	Diff line
		@@ -186,6 +186,14 @@ config FB_SYS_FOPS
		depends on FB
		default n

		config FB_WMT_GE_ROPS
		tristate
		depends on FB
		default n
		---help---
		Include functions for accelerated rectangle filling and area
		copying using WonderMedia Graphics Engine operations.

		config FB_DEFERRED_IO
		bool
		depends on FB
		@@ -1722,6 +1730,24 @@ config FB_AU1200
		various panels and CRTs by passing in kernel cmd line option
		au1200fb:panel=<name>.

		config FB_VT8500
		bool "VT8500 LCD Driver"
		depends on (FB = y) && ARM && ARCH_VT8500 && VTWM_VERSION_VT8500
		select FB_WMT_GE_ROPS
		select FB_SYS_IMAGEBLIT
		help
		This is the framebuffer driver for VIA VT8500 integrated LCD
		controller.

		config FB_WM8505
		bool "WM8505 frame buffer support"
		depends on (FB = y) && ARM && ARCH_VT8500 && VTWM_VERSION_WM8505
		select FB_WMT_GE_ROPS
		select FB_SYS_IMAGEBLIT
		help
		This is the framebuffer driver for WonderMedia WM8505
		integrated LCD controller.

		source "drivers/video/geode/Kconfig"

		config FB_HIT

drivers/video/Makefile

+3 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@ obj-$(CONFIG_FB_SVGALIB) += svgalib.o
		obj-$(CONFIG_FB_MACMODES) += macmodes.o
		obj-$(CONFIG_FB_DDC) += fb_ddc.o
		obj-$(CONFIG_FB_DEFERRED_IO) += fb_defio.o
		obj-$(CONFIG_FB_WMT_GE_ROPS) += wmt_ge_rops.o

		# Hardware specific drivers go first
		obj-$(CONFIG_FB_AMIGA) += amifb.o c2p_planar.o
		@@ -104,6 +105,8 @@ obj-$(CONFIG_FB_W100) += w100fb.o
		obj-$(CONFIG_FB_TMIO) += tmiofb.o
		obj-$(CONFIG_FB_AU1100) += au1100fb.o
		obj-$(CONFIG_FB_AU1200) += au1200fb.o
		obj-$(CONFIG_FB_VT8500) += vt8500lcdfb.o
		obj-$(CONFIG_FB_WM8505) += wm8505fb.o
		obj-$(CONFIG_FB_PMAG_AA) += pmag-aa-fb.o
		obj-$(CONFIG_FB_PMAG_BA) += pmag-ba-fb.o
		obj-$(CONFIG_FB_PMAGB_B) += pmagb-b-fb.o

drivers/video/vt8500lcdfb.c

0 → 100644

+447 −0

Original line number	Diff line number	Diff line
		/*
		* linux/drivers/video/vt8500lcdfb.c
		*
		* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
		*
		* Based on skeletonfb.c and pxafb.c
		*
		* 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.
		*/

		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/errno.h>
		#include <linux/string.h>
		#include <linux/mm.h>
		#include <linux/slab.h>
		#include <linux/delay.h>
		#include <linux/fb.h>
		#include <linux/init.h>
		#include <linux/interrupt.h>
		#include <linux/io.h>
		#include <linux/dma-mapping.h>
		#include <linux/platform_device.h>
		#include <linux/wait.h>

		#include <mach/vt8500fb.h>

		#include "vt8500lcdfb.h"
		#include "wmt_ge_rops.h"

		#define to_vt8500lcd_info(__info) container_of(__info, \
		struct vt8500lcd_info, fb)

		static int vt8500lcd_set_par(struct fb_info *info)
		{
		struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
		int reg_bpp = 5; /* 16bpp */
		int i;
		unsigned long control0;

		if (!fbi)
		return -EINVAL;

		if (info->var.bits_per_pixel <= 8) {
		/* palettized */
		info->var.red.offset = 0;
		info->var.red.length = info->var.bits_per_pixel;
		info->var.red.msb_right = 0;

		info->var.green.offset = 0;
		info->var.green.length = info->var.bits_per_pixel;
		info->var.green.msb_right = 0;

		info->var.blue.offset = 0;
		info->var.blue.length = info->var.bits_per_pixel;
		info->var.blue.msb_right = 0;

		info->var.transp.offset = 0;
		info->var.transp.length = 0;
		info->var.transp.msb_right = 0;

		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		info->fix.line_length = info->var.xres_virtual /
		(8/info->var.bits_per_pixel);
		} else {
		/* non-palettized */
		info->var.transp.offset = 0;
		info->var.transp.length = 0;
		info->var.transp.msb_right = 0;

		if (info->var.bits_per_pixel == 16) {
		/* RGB565 */
		info->var.red.offset = 11;
		info->var.red.length = 5;
		info->var.red.msb_right = 0;
		info->var.green.offset = 5;
		info->var.green.length = 6;
		info->var.green.msb_right = 0;
		info->var.blue.offset = 0;
		info->var.blue.length = 5;
		info->var.blue.msb_right = 0;
		} else {
		/* Equal depths per channel */
		info->var.red.offset = info->var.bits_per_pixel
		* 2 / 3;
		info->var.red.length = info->var.bits_per_pixel / 3;
		info->var.red.msb_right = 0;
		info->var.green.offset = info->var.bits_per_pixel / 3;
		info->var.green.length = info->var.bits_per_pixel / 3;
		info->var.green.msb_right = 0;
		info->var.blue.offset = 0;
		info->var.blue.length = info->var.bits_per_pixel / 3;
		info->var.blue.msb_right = 0;
		}

		info->fix.visual = FB_VISUAL_TRUECOLOR;
		info->fix.line_length = info->var.bits_per_pixel > 16 ?
		info->var.xres_virtual << 2 :
		info->var.xres_virtual << 1;
		}

		for (i = 0; i < 8; i++) {
		if (bpp_values[i] == info->var.bits_per_pixel) {
		reg_bpp = i;
		continue;
		}
		}

		control0 = readl(fbi->regbase) & ~0xf;
		writel(0, fbi->regbase);
		while (readl(fbi->regbase + 0x38) & 0x10)
		/* wait */;
		writel((((info->var.hsync_len - 1) & 0x3f) << 26)
		\| ((info->var.left_margin & 0xff) << 18)
		\| (((info->var.xres - 1) & 0x3ff) << 8)
		\| (info->var.right_margin & 0xff), fbi->regbase + 0x4);
		writel((((info->var.vsync_len - 1) & 0x3f) << 26)
		\| ((info->var.upper_margin & 0xff) << 18)
		\| (((info->var.yres - 1) & 0x3ff) << 8)
		\| (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
		writel((((info->var.yres - 1) & 0x400) << 2)
		\| ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
		writel(0x80000000, fbi->regbase + 0x20);
		writel(control0 \| (reg_bpp << 1) \| 0x100, fbi->regbase);

		return 0;
		}

		static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
		{
		chan &= 0xffff;
		chan >>= 16 - bf->length;
		return chan << bf->offset;
		}

		static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
		unsigned blue, unsigned transp,
		struct fb_info *info) {
		struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
		int ret = 1;
		unsigned int val;
		if (regno >= 256)
		return -EINVAL;

		if (info->var.grayscale)
		red = green = blue =
		(19595 * red + 38470 * green + 7471 * blue) >> 16;

		switch (fbi->fb.fix.visual) {
		case FB_VISUAL_TRUECOLOR:
		if (regno < 16) {
		u32 *pal = fbi->fb.pseudo_palette;

		val = chan_to_field(red, &fbi->fb.var.red);
		val \|= chan_to_field(green, &fbi->fb.var.green);
		val \|= chan_to_field(blue, &fbi->fb.var.blue);

		pal[regno] = val;
		ret = 0;
		}
		break;

		case FB_VISUAL_STATIC_PSEUDOCOLOR:
		case FB_VISUAL_PSEUDOCOLOR:
		writew((red & 0xf800)
		\| ((green >> 5) & 0x7e0)
		\| ((blue >> 11) & 0x1f),
		fbi->palette_cpu + sizeof(u16) * regno);
		break;
		}

		return ret;
		}

		static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
		unsigned long arg)
		{
		int ret = 0;
		struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);

		if (cmd == FBIO_WAITFORVSYNC) {
		/* Unmask End of Frame interrupt */
		writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
		ret = wait_event_interruptible_timeout(fbi->wait,
		readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
		/* Mask back to reduce unwanted interrupt traffic */
		writel(0xffffffff, fbi->regbase + 0x3c);
		if (ret < 0)
		return ret;
		if (ret == 0)
		return -ETIMEDOUT;
		}

		return ret;
		}

		static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
		struct fb_info *info)
		{
		unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
		unsigned off = pixlen * var->xoffset
		+ info->fix.line_length * var->yoffset;
		struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);

		writel((1 << 31)
		\| (((var->xres_virtual - var->xres) * pixlen / 4) << 20)
		\| (off >> 2), fbi->regbase + 0x20);
		return 0;
		}

		static struct fb_ops vt8500lcd_ops = {
		.owner = THIS_MODULE,
		.fb_set_par = vt8500lcd_set_par,
		.fb_setcolreg = vt8500lcd_setcolreg,
		.fb_fillrect = wmt_ge_fillrect,
		.fb_copyarea = wmt_ge_copyarea,
		.fb_imageblit = sys_imageblit,
		.fb_sync = wmt_ge_sync,
		.fb_ioctl = vt8500lcd_ioctl,
		.fb_pan_display = vt8500lcd_pan_display,
		};

		static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
		{
		struct vt8500lcd_info *fbi = dev_id;

		if (readl(fbi->regbase + 0x38) & (1 << 3))
		wake_up_interruptible(&fbi->wait);

		writel(0xffffffff, fbi->regbase + 0x38);
		return IRQ_HANDLED;
		}

		static int __devinit vt8500lcd_probe(struct platform_device *pdev)
		{
		struct vt8500lcd_info *fbi;
		struct resource *res;
		struct vt8500fb_platform_data *pdata = pdev->dev.platform_data;
		void *addr;
		int irq, ret;

		ret = -ENOMEM;
		fbi = NULL;

		fbi = kzalloc(sizeof(struct vt8500lcd_info) + sizeof(u32) * 16,
		GFP_KERNEL);
		if (!fbi) {
		dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
		ret = -ENOMEM;
		goto failed;
		}

		strcpy(fbi->fb.fix.id, "VT8500 LCD");

		fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
		fbi->fb.fix.xpanstep = 0;
		fbi->fb.fix.ypanstep = 1;
		fbi->fb.fix.ywrapstep = 0;
		fbi->fb.fix.accel = FB_ACCEL_NONE;

		fbi->fb.var.nonstd = 0;
		fbi->fb.var.activate = FB_ACTIVATE_NOW;
		fbi->fb.var.height = -1;
		fbi->fb.var.width = -1;
		fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;

		fbi->fb.fbops = &vt8500lcd_ops;
		fbi->fb.flags = FBINFO_DEFAULT
		\| FBINFO_HWACCEL_COPYAREA
		\| FBINFO_HWACCEL_FILLRECT
		\| FBINFO_HWACCEL_YPAN
		\| FBINFO_VIRTFB
		\| FBINFO_PARTIAL_PAN_OK;
		fbi->fb.node = -1;

		addr = fbi;
		addr = addr + sizeof(struct vt8500lcd_info);
		fbi->fb.pseudo_palette = addr;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (res == NULL) {
		dev_err(&pdev->dev, "no I/O memory resource defined\n");
		ret = -ENODEV;
		goto failed_fbi;
		}

		res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
		if (res == NULL) {
		dev_err(&pdev->dev, "failed to request I/O memory\n");
		ret = -EBUSY;
		goto failed_fbi;
		}

		fbi->regbase = ioremap(res->start, resource_size(res));
		if (fbi->regbase == NULL) {
		dev_err(&pdev->dev, "failed to map I/O memory\n");
		ret = -EBUSY;
		goto failed_free_res;
		}

		fbi->fb.fix.smem_start = pdata->video_mem_phys;
		fbi->fb.fix.smem_len = pdata->video_mem_len;
		fbi->fb.screen_base = pdata->video_mem_virt;

		fbi->palette_size = PAGE_ALIGN(512);
		fbi->palette_cpu = dma_alloc_coherent(&pdev->dev,
		fbi->palette_size,
		&fbi->palette_phys,
		GFP_KERNEL);
		if (fbi->palette_cpu == NULL) {
		dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
		ret = -ENOMEM;
		goto failed_free_io;
		}

		irq = platform_get_irq(pdev, 0);
		if (irq < 0) {
		dev_err(&pdev->dev, "no IRQ defined\n");
		ret = -ENODEV;
		goto failed_free_palette;
		}

		ret = request_irq(irq, vt8500lcd_handle_irq, IRQF_DISABLED, "LCD", fbi);
		if (ret) {
		dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
		ret = -EBUSY;
		goto failed_free_palette;
		}

		init_waitqueue_head(&fbi->wait);

		if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
		dev_err(&pdev->dev, "Failed to allocate color map\n");
		ret = -ENOMEM;
		goto failed_free_irq;
		}

		fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
		fbi->fb.var.bits_per_pixel = pdata->bpp;
		fbi->fb.var.xres_virtual = pdata->xres_virtual;
		fbi->fb.var.yres_virtual = pdata->yres_virtual;

		ret = vt8500lcd_set_par(&fbi->fb);
		if (ret) {
		dev_err(&pdev->dev, "Failed to set parameters\n");
		goto failed_free_cmap;
		}

		writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
		writel((fbi->palette_phys & 0xfffffe00) \| 1, fbi->regbase + 0x18);

		platform_set_drvdata(pdev, fbi);

		ret = register_framebuffer(&fbi->fb);
		if (ret < 0) {
		dev_err(&pdev->dev,
		"Failed to register framebuffer device: %d\n", ret);
		goto failed_free_cmap;
		}

		/*
		* Ok, now enable the LCD controller
		*/
		writel(readl(fbi->regbase) \| 1, fbi->regbase);

		return 0;

		failed_free_cmap:
		if (fbi->fb.cmap.len)
		fb_dealloc_cmap(&fbi->fb.cmap);
		failed_free_irq:
		free_irq(irq, fbi);
		failed_free_palette:
		dma_free_coherent(&pdev->dev, fbi->palette_size,
		fbi->palette_cpu, fbi->palette_phys);
		failed_free_io:
		iounmap(fbi->regbase);
		failed_free_res:
		release_mem_region(res->start, resource_size(res));
		failed_fbi:
		platform_set_drvdata(pdev, NULL);
		kfree(fbi);
		failed:
		return ret;
		}

		static int __devexit vt8500lcd_remove(struct platform_device *pdev)
		{
		struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
		struct resource *res;
		int irq;

		unregister_framebuffer(&fbi->fb);

		writel(0, fbi->regbase);

		if (fbi->fb.cmap.len)
		fb_dealloc_cmap(&fbi->fb.cmap);

		irq = platform_get_irq(pdev, 0);
		free_irq(irq, fbi);

		dma_free_coherent(&pdev->dev, fbi->palette_size,
		fbi->palette_cpu, fbi->palette_phys);

		iounmap(fbi->regbase);

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		release_mem_region(res->start, resource_size(res));

		kfree(fbi);

		return 0;
		}

		static struct platform_driver vt8500lcd_driver = {
		.probe = vt8500lcd_probe,
		.remove = __devexit_p(vt8500lcd_remove),
		.driver = {
		.owner = THIS_MODULE,
		.name = "vt8500-lcd",
		},
		};

		static int __init vt8500lcd_init(void)
		{
		return platform_driver_register(&vt8500lcd_driver);
		}

		static void __exit vt8500lcd_exit(void)
		{
		platform_driver_unregister(&vt8500lcd_driver);
		}

		module_init(vt8500lcd_init);
		module_exit(vt8500lcd_exit);

		MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
		MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
		MODULE_LICENSE("GPL");

drivers/video/vt8500lcdfb.h

0 → 100644

+34 −0

Original line number	Diff line number	Diff line
		/*
		* linux/drivers/video/vt8500lcdfb.h
		*
		* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
		*
		* 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.
		*/

		struct vt8500lcd_info {
		struct fb_info fb;
		void __iomem *regbase;
		void __iomem *palette_cpu;
		dma_addr_t palette_phys;
		size_t palette_size;
		wait_queue_head_t wait;
		};

		static int bpp_values[] = {
		1,
		2,
		4,
		8,
		12,
		16,
		18,
		24,
		};

drivers/video/wm8505fb.c

0 → 100644

+422 −0

Original line number	Diff line number	Diff line
		/*
		* WonderMedia WM8505 Frame Buffer device driver
		*
		* Copyright (C) 2010 Ed Spiridonov <edo.rus@gmail.com>
		* Based on vt8500lcdfb.c
		*
		* 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.
		*/

		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/errno.h>
		#include <linux/string.h>
		#include <linux/mm.h>
		#include <linux/slab.h>
		#include <linux/delay.h>
		#include <linux/fb.h>
		#include <linux/init.h>
		#include <linux/interrupt.h>
		#include <linux/io.h>
		#include <linux/dma-mapping.h>
		#include <linux/platform_device.h>
		#include <linux/wait.h>

		#include <mach/vt8500fb.h>

		#include "wm8505fb_regs.h"
		#include "wmt_ge_rops.h"

		#define DRIVER_NAME "wm8505-fb"

		#define to_wm8505fb_info(__info) container_of(__info, \
		struct wm8505fb_info, fb)
		struct wm8505fb_info {
		struct fb_info fb;
		void __iomem *regbase;
		unsigned int contrast;
		};


		static int wm8505fb_init_hw(struct fb_info *info)
		{
		struct wm8505fb_info *fbi = to_wm8505fb_info(info);

		int i;

		/* I know the purpose only of few registers, so clear unknown */
		for (i = 0; i < 0x200; i += 4)
		writel(0, fbi->regbase + i);

		/* Set frame buffer address */
		writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
		writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);

		/* Set in-memory picture format to RGB 32bpp */
		writel(0x1c, fbi->regbase + WMT_GOVR_COLORSPACE);
		writel(1, fbi->regbase + WMT_GOVR_COLORSPACE1);

		/* Virtual buffer size */
		writel(info->var.xres, fbi->regbase + WMT_GOVR_XRES);
		writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);

		/* black magic ;) */
		writel(0xf, fbi->regbase + WMT_GOVR_FHI);
		writel(4, fbi->regbase + WMT_GOVR_DVO_SET);
		writel(1, fbi->regbase + WMT_GOVR_MIF_ENABLE);
		writel(1, fbi->regbase + WMT_GOVR_REG_UPDATE);

		return 0;
		}

		static int wm8505fb_set_timing(struct fb_info *info)
		{
		struct wm8505fb_info *fbi = to_wm8505fb_info(info);

		int h_start = info->var.left_margin;
		int h_end = h_start + info->var.xres;
		int h_all = h_end + info->var.right_margin;
		int h_sync = info->var.hsync_len;

		int v_start = info->var.upper_margin;
		int v_end = v_start + info->var.yres;
		int v_all = v_end + info->var.lower_margin;
		int v_sync = info->var.vsync_len + 1;

		writel(0, fbi->regbase + WMT_GOVR_TG);

		writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);
		writel(h_end, fbi->regbase + WMT_GOVR_TIMING_H_END);
		writel(h_all, fbi->regbase + WMT_GOVR_TIMING_H_ALL);
		writel(h_sync, fbi->regbase + WMT_GOVR_TIMING_H_SYNC);

		writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);
		writel(v_end, fbi->regbase + WMT_GOVR_TIMING_V_END);
		writel(v_all, fbi->regbase + WMT_GOVR_TIMING_V_ALL);
		writel(v_sync, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);

		writel(1, fbi->regbase + WMT_GOVR_TG);

		return 0;
		}


		static int wm8505fb_set_par(struct fb_info *info)
		{
		struct wm8505fb_info *fbi = to_wm8505fb_info(info);

		if (!fbi)
		return -EINVAL;

		if (info->var.bits_per_pixel == 32) {
		info->var.red.offset = 16;
		info->var.red.length = 8;
		info->var.red.msb_right = 0;
		info->var.green.offset = 8;
		info->var.green.length = 8;
		info->var.green.msb_right = 0;
		info->var.blue.offset = 0;
		info->var.blue.length = 8;
		info->var.blue.msb_right = 0;
		info->fix.visual = FB_VISUAL_TRUECOLOR;
		info->fix.line_length = info->var.xres_virtual << 2;
		}

		wm8505fb_set_timing(info);

		writel(fbi->contrast<<16 \| fbi->contrast<<8 \| fbi->contrast,
		fbi->regbase + WMT_GOVR_CONTRAST);

		return 0;
		}

		static ssize_t contrast_show(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct fb_info *info = dev_get_drvdata(dev);
		struct wm8505fb_info *fbi = to_wm8505fb_info(info);

		return sprintf(buf, "%d\n", fbi->contrast);
		}

		static ssize_t contrast_store(struct device *dev,
		struct device_attribute *attr,
		const char *buf, size_t count)
		{
		struct fb_info *info = dev_get_drvdata(dev);
		struct wm8505fb_info *fbi = to_wm8505fb_info(info);
		unsigned long tmp;

		if (strict_strtoul(buf, 10, &tmp) \|\| (tmp > 0xff))
		return -EINVAL;
		fbi->contrast = tmp;

		wm8505fb_set_par(info);

		return count;
		}

		static DEVICE_ATTR(contrast, 0644, contrast_show, contrast_store);

		static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
		{
		chan &= 0xffff;
		chan >>= 16 - bf->length;
		return chan << bf->offset;
		}

		static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green,
		unsigned blue, unsigned transp,
		struct fb_info *info) {
		struct wm8505fb_info *fbi = to_wm8505fb_info(info);
		int ret = 1;
		unsigned int val;
		if (regno >= 256)
		return -EINVAL;

		if (info->var.grayscale)
		red = green = blue =
		(19595 * red + 38470 * green + 7471 * blue) >> 16;

		switch (fbi->fb.fix.visual) {
		case FB_VISUAL_TRUECOLOR:
		if (regno < 16) {
		u32 *pal = info->pseudo_palette;

		val = chan_to_field(red, &fbi->fb.var.red);
		val \|= chan_to_field(green, &fbi->fb.var.green);
		val \|= chan_to_field(blue, &fbi->fb.var.blue);

		pal[regno] = val;
		ret = 0;
		}
		break;
		}

		return ret;
		}

		static int wm8505fb_pan_display(struct fb_var_screeninfo *var,
		struct fb_info *info)
		{
		struct wm8505fb_info *fbi = to_wm8505fb_info(info);

		writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN);
		writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN);
		return 0;
		}

		static int wm8505fb_blank(int blank, struct fb_info *info)
		{
		struct wm8505fb_info *fbi = to_wm8505fb_info(info);

		switch (blank) {
		case FB_BLANK_UNBLANK:
		wm8505fb_set_timing(info);
		break;
		default:
		writel(0, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
		break;
		}

		return 0;
		}

		static struct fb_ops wm8505fb_ops = {
		.owner = THIS_MODULE,
		.fb_set_par = wm8505fb_set_par,
		.fb_setcolreg = wm8505fb_setcolreg,
		.fb_fillrect = wmt_ge_fillrect,
		.fb_copyarea = wmt_ge_copyarea,
		.fb_imageblit = sys_imageblit,
		.fb_sync = wmt_ge_sync,
		.fb_pan_display = wm8505fb_pan_display,
		.fb_blank = wm8505fb_blank,
		};

		static int __devinit wm8505fb_probe(struct platform_device *pdev)
		{
		struct wm8505fb_info *fbi;
		struct resource *res;
		void *addr;
		struct vt8500fb_platform_data *pdata;
		int ret;

		pdata = pdev->dev.platform_data;

		ret = -ENOMEM;
		fbi = NULL;

		fbi = kzalloc(sizeof(struct wm8505fb_info) + sizeof(u32) * 16,
		GFP_KERNEL);
		if (!fbi) {
		dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
		ret = -ENOMEM;
		goto failed;
		}

		strcpy(fbi->fb.fix.id, DRIVER_NAME);

		fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
		fbi->fb.fix.xpanstep = 1;
		fbi->fb.fix.ypanstep = 1;
		fbi->fb.fix.ywrapstep = 0;
		fbi->fb.fix.accel = FB_ACCEL_NONE;

		fbi->fb.fbops = &wm8505fb_ops;
		fbi->fb.flags = FBINFO_DEFAULT
		\| FBINFO_HWACCEL_COPYAREA
		\| FBINFO_HWACCEL_FILLRECT
		\| FBINFO_HWACCEL_XPAN
		\| FBINFO_HWACCEL_YPAN
		\| FBINFO_VIRTFB
		\| FBINFO_PARTIAL_PAN_OK;
		fbi->fb.node = -1;

		addr = fbi;
		addr = addr + sizeof(struct wm8505fb_info);
		fbi->fb.pseudo_palette = addr;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (res == NULL) {
		dev_err(&pdev->dev, "no I/O memory resource defined\n");
		ret = -ENODEV;
		goto failed_fbi;
		}

		res = request_mem_region(res->start, resource_size(res), "wm8505fb");
		if (res == NULL) {
		dev_err(&pdev->dev, "failed to request I/O memory\n");
		ret = -EBUSY;
		goto failed_fbi;
		}

		fbi->regbase = ioremap(res->start, resource_size(res));
		if (fbi->regbase == NULL) {
		dev_err(&pdev->dev, "failed to map I/O memory\n");
		ret = -EBUSY;
		goto failed_free_res;
		}

		fb_videomode_to_var(&fbi->fb.var, &pdata->mode);

		fbi->fb.var.nonstd = 0;
		fbi->fb.var.activate = FB_ACTIVATE_NOW;

		fbi->fb.var.height = -1;
		fbi->fb.var.width = -1;
		fbi->fb.var.xres_virtual = pdata->xres_virtual;
		fbi->fb.var.yres_virtual = pdata->yres_virtual;
		fbi->fb.var.bits_per_pixel = pdata->bpp;

		fbi->fb.fix.smem_start = pdata->video_mem_phys;
		fbi->fb.fix.smem_len = pdata->video_mem_len;
		fbi->fb.screen_base = pdata->video_mem_virt;
		fbi->fb.screen_size = pdata->video_mem_len;

		if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
		dev_err(&pdev->dev, "Failed to allocate color map\n");
		ret = -ENOMEM;
		goto failed_free_io;
		}

		wm8505fb_init_hw(&fbi->fb);

		fbi->contrast = 0x80;
		ret = wm8505fb_set_par(&fbi->fb);
		if (ret) {
		dev_err(&pdev->dev, "Failed to set parameters\n");
		goto failed_free_cmap;
		}

		platform_set_drvdata(pdev, fbi);

		ret = register_framebuffer(&fbi->fb);
		if (ret < 0) {
		dev_err(&pdev->dev,
		"Failed to register framebuffer device: %d\n", ret);
		goto failed_free_cmap;
		}

		ret = device_create_file(&pdev->dev, &dev_attr_contrast);
		if (ret < 0) {
		printk(KERN_WARNING "fb%d: failed to register attributes (%d)\n",
		fbi->fb.node, ret);
		}

		printk(KERN_INFO "fb%d: %s frame buffer at 0x%lx-0x%lx\n",
		fbi->fb.node, fbi->fb.fix.id, fbi->fb.fix.smem_start,
		fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);

		return 0;

		failed_free_cmap:
		if (fbi->fb.cmap.len)
		fb_dealloc_cmap(&fbi->fb.cmap);
		failed_free_io:
		iounmap(fbi->regbase);
		failed_free_res:
		release_mem_region(res->start, resource_size(res));
		failed_fbi:
		platform_set_drvdata(pdev, NULL);
		kfree(fbi);
		failed:
		return ret;
		}

		static int __devexit wm8505fb_remove(struct platform_device *pdev)
		{
		struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
		struct resource *res;

		device_remove_file(&pdev->dev, &dev_attr_contrast);

		unregister_framebuffer(&fbi->fb);

		writel(0, fbi->regbase);

		if (fbi->fb.cmap.len)
		fb_dealloc_cmap(&fbi->fb.cmap);

		iounmap(fbi->regbase);

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		release_mem_region(res->start, resource_size(res));

		kfree(fbi);

		return 0;
		}

		static struct platform_driver wm8505fb_driver = {
		.probe = wm8505fb_probe,
		.remove = __devexit_p(wm8505fb_remove),
		.driver = {
		.owner = THIS_MODULE,
		.name = DRIVER_NAME,
		},
		};

		static int __init wm8505fb_init(void)
		{
		return platform_driver_register(&wm8505fb_driver);
		}

		static void __exit wm8505fb_exit(void)
		{
		platform_driver_unregister(&wm8505fb_driver);
		}

		module_init(wm8505fb_init);
		module_exit(wm8505fb_exit);

		MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
		MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
		MODULE_LICENSE("GPL");

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