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OpenCloudOS-Kernel/drivers/video/fbdev/bf54x-lq043fb.c

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/*
* File: drivers/video/bf54x-lq043.c
* Based on:
* Author: Michael Hennerich <hennerich@blackfin.uclinux.org>
*
* Created:
* Description: ADSP-BF54x Framebuffer driver
*
*
* Modified:
* Copyright 2007-2008 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* 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, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/device.h>
#include <linux/backlight.h>
#include <linux/lcd.h>
#include <linux/spinlock.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <asm/blackfin.h>
#include <asm/irq.h>
#include <asm/dpmc.h>
#include <asm/dma-mapping.h>
#include <asm/dma.h>
#include <asm/portmux.h>
#include <mach/bf54x-lq043.h>
#define NO_BL_SUPPORT
#define DRIVER_NAME "bf54x-lq043"
static char driver_name[] = DRIVER_NAME;
#define BFIN_LCD_NBR_PALETTE_ENTRIES 256
#define EPPI0_18 {P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2, P_PPI0_D0, P_PPI0_D1, P_PPI0_D2, P_PPI0_D3, \
P_PPI0_D4, P_PPI0_D5, P_PPI0_D6, P_PPI0_D7, P_PPI0_D8, P_PPI0_D9, P_PPI0_D10, \
P_PPI0_D11, P_PPI0_D12, P_PPI0_D13, P_PPI0_D14, P_PPI0_D15, P_PPI0_D16, P_PPI0_D17, 0}
#define EPPI0_24 {P_PPI0_D18, P_PPI0_D19, P_PPI0_D20, P_PPI0_D21, P_PPI0_D22, P_PPI0_D23, 0}
struct bfin_bf54xfb_info {
struct fb_info *fb;
struct device *dev;
struct bfin_bf54xfb_mach_info *mach_info;
unsigned char *fb_buffer; /* RGB Buffer */
dma_addr_t dma_handle;
int lq043_open_cnt;
int irq;
spinlock_t lock; /* lock */
};
static int nocursor;
module_param(nocursor, int, 0644);
MODULE_PARM_DESC(nocursor, "cursor enable/disable");
static int outp_rgb666;
module_param(outp_rgb666, int, 0);
MODULE_PARM_DESC(outp_rgb666, "Output 18-bit RGB666");
#define LCD_X_RES 480 /*Horizontal Resolution */
#define LCD_Y_RES 272 /* Vertical Resolution */
#define LCD_BPP 24 /* Bit Per Pixel */
#define DMA_BUS_SIZE 32
/* -- Horizontal synchronizing --
*
* Timing characteristics taken from the SHARP LQ043T1DG01 datasheet
* (LCY-W-06602A Page 9 of 22)
*
* Clock Frequency 1/Tc Min 7.83 Typ 9.00 Max 9.26 MHz
*
* Period TH - 525 - Clock
* Pulse width THp - 41 - Clock
* Horizontal period THd - 480 - Clock
* Back porch THb - 2 - Clock
* Front porch THf - 2 - Clock
*
* -- Vertical synchronizing --
* Period TV - 286 - Line
* Pulse width TVp - 10 - Line
* Vertical period TVd - 272 - Line
* Back porch TVb - 2 - Line
* Front porch TVf - 2 - Line
*/
#define LCD_CLK (8*1000*1000) /* 8MHz */
/* # active data to transfer after Horizontal Delay clock */
#define EPPI_HCOUNT LCD_X_RES
/* # active lines to transfer after Vertical Delay clock */
#define EPPI_VCOUNT LCD_Y_RES
/* Samples per Line = 480 (active data) + 45 (padding) */
#define EPPI_LINE 525
/* Lines per Frame = 272 (active data) + 14 (padding) */
#define EPPI_FRAME 286
/* FS1 (Hsync) Width (Typical)*/
#define EPPI_FS1W_HBL 41
/* FS1 (Hsync) Period (Typical) */
#define EPPI_FS1P_AVPL EPPI_LINE
/* Horizontal Delay clock after assertion of Hsync (Typical) */
#define EPPI_HDELAY 43
/* FS2 (Vsync) Width = FS1 (Hsync) Period * 10 */
#define EPPI_FS2W_LVB (EPPI_LINE * 10)
/* FS2 (Vsync) Period = FS1 (Hsync) Period * Lines per Frame */
#define EPPI_FS2P_LAVF (EPPI_LINE * EPPI_FRAME)
/* Vertical Delay after assertion of Vsync (2 Lines) */
#define EPPI_VDELAY 12
#define EPPI_CLIP 0xFF00FF00
/* EPPI Control register configuration value for RGB out
* - EPPI as Output
* GP 2 frame sync mode,
* Internal Clock generation disabled, Internal FS generation enabled,
* Receives samples on EPPI_CLK raising edge, Transmits samples on EPPI_CLK falling edge,
* FS1 & FS2 are active high,
* DLEN = 6 (24 bits for RGB888 out) or 5 (18 bits for RGB666 out)
* DMA Unpacking disabled when RGB Formating is enabled, otherwise DMA unpacking enabled
* Swapping Enabled,
* One (DMA) Channel Mode,
* RGB Formatting Enabled for RGB666 output, disabled for RGB888 output
* Regular watermark - when FIFO is 100% full,
* Urgent watermark - when FIFO is 75% full
*/
#define EPPI_CONTROL (0x20136E2E | SWAPEN)
static inline u16 get_eppi_clkdiv(u32 target_ppi_clk)
{
u32 sclk = get_sclk();
/* EPPI_CLK = (SCLK) / (2 * (EPPI_CLKDIV[15:0] + 1)) */
return (((sclk / target_ppi_clk) / 2) - 1);
}
static void config_ppi(struct bfin_bf54xfb_info *fbi)
{
u16 eppi_clkdiv = get_eppi_clkdiv(LCD_CLK);
bfin_write_EPPI0_FS1W_HBL(EPPI_FS1W_HBL);
bfin_write_EPPI0_FS1P_AVPL(EPPI_FS1P_AVPL);
bfin_write_EPPI0_FS2W_LVB(EPPI_FS2W_LVB);
bfin_write_EPPI0_FS2P_LAVF(EPPI_FS2P_LAVF);
bfin_write_EPPI0_CLIP(EPPI_CLIP);
bfin_write_EPPI0_FRAME(EPPI_FRAME);
bfin_write_EPPI0_LINE(EPPI_LINE);
bfin_write_EPPI0_HCOUNT(EPPI_HCOUNT);
bfin_write_EPPI0_HDELAY(EPPI_HDELAY);
bfin_write_EPPI0_VCOUNT(EPPI_VCOUNT);
bfin_write_EPPI0_VDELAY(EPPI_VDELAY);
bfin_write_EPPI0_CLKDIV(eppi_clkdiv);
/*
* DLEN = 6 (24 bits for RGB888 out) or 5 (18 bits for RGB666 out)
* RGB Formatting Enabled for RGB666 output, disabled for RGB888 output
*/
if (outp_rgb666)
bfin_write_EPPI0_CONTROL((EPPI_CONTROL & ~DLENGTH) | DLEN_18 |
RGB_FMT_EN);
else
bfin_write_EPPI0_CONTROL(((EPPI_CONTROL & ~DLENGTH) | DLEN_24) &
~RGB_FMT_EN);
}
static int config_dma(struct bfin_bf54xfb_info *fbi)
{
set_dma_config(CH_EPPI0,
set_bfin_dma_config(DIR_READ, DMA_FLOW_AUTO,
INTR_DISABLE, DIMENSION_2D,
DATA_SIZE_32,
DMA_NOSYNC_KEEP_DMA_BUF));
set_dma_x_count(CH_EPPI0, (LCD_X_RES * LCD_BPP) / DMA_BUS_SIZE);
set_dma_x_modify(CH_EPPI0, DMA_BUS_SIZE / 8);
set_dma_y_count(CH_EPPI0, LCD_Y_RES);
set_dma_y_modify(CH_EPPI0, DMA_BUS_SIZE / 8);
set_dma_start_addr(CH_EPPI0, (unsigned long)fbi->fb_buffer);
return 0;
}
static int request_ports(struct bfin_bf54xfb_info *fbi)
{
u16 eppi_req_18[] = EPPI0_18;
u16 disp = fbi->mach_info->disp;
if (gpio_request_one(disp, GPIOF_OUT_INIT_HIGH, DRIVER_NAME)) {
printk(KERN_ERR "Requesting GPIO %d failed\n", disp);
return -EFAULT;
}
if (peripheral_request_list(eppi_req_18, DRIVER_NAME)) {
printk(KERN_ERR "Requesting Peripherals failed\n");
gpio_free(disp);
return -EFAULT;
}
if (!outp_rgb666) {
u16 eppi_req_24[] = EPPI0_24;
if (peripheral_request_list(eppi_req_24, DRIVER_NAME)) {
printk(KERN_ERR "Requesting Peripherals failed\n");
peripheral_free_list(eppi_req_18);
gpio_free(disp);
return -EFAULT;
}
}
return 0;
}
static void free_ports(struct bfin_bf54xfb_info *fbi)
{
u16 eppi_req_18[] = EPPI0_18;
gpio_free(fbi->mach_info->disp);
peripheral_free_list(eppi_req_18);
if (!outp_rgb666) {
u16 eppi_req_24[] = EPPI0_24;
peripheral_free_list(eppi_req_24);
}
}
static int bfin_bf54x_fb_open(struct fb_info *info, int user)
{
struct bfin_bf54xfb_info *fbi = info->par;
spin_lock(&fbi->lock);
fbi->lq043_open_cnt++;
if (fbi->lq043_open_cnt <= 1) {
bfin_write_EPPI0_CONTROL(0);
SSYNC();
config_dma(fbi);
config_ppi(fbi);
/* start dma */
enable_dma(CH_EPPI0);
bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN);
}
spin_unlock(&fbi->lock);
return 0;
}
static int bfin_bf54x_fb_release(struct fb_info *info, int user)
{
struct bfin_bf54xfb_info *fbi = info->par;
spin_lock(&fbi->lock);
fbi->lq043_open_cnt--;
if (fbi->lq043_open_cnt <= 0) {
bfin_write_EPPI0_CONTROL(0);
SSYNC();
disable_dma(CH_EPPI0);
}
spin_unlock(&fbi->lock);
return 0;
}
static int bfin_bf54x_fb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
switch (var->bits_per_pixel) {
case 24:/* TRUECOLOUR, 16m */
var->red.offset = 16;
var->green.offset = 8;
var->blue.offset = 0;
var->red.length = var->green.length = var->blue.length = 8;
var->transp.offset = 0;
var->transp.length = 0;
var->transp.msb_right = 0;
var->red.msb_right = 0;
var->green.msb_right = 0;
var->blue.msb_right = 0;
break;
default:
pr_debug("%s: depth not supported: %u BPP\n", __func__,
var->bits_per_pixel);
return -EINVAL;
}
if (info->var.xres != var->xres || info->var.yres != var->yres ||
info->var.xres_virtual != var->xres_virtual ||
info->var.yres_virtual != var->yres_virtual) {
pr_debug("%s: Resolution not supported: X%u x Y%u \n",
__func__, var->xres, var->yres);
return -EINVAL;
}
/*
* Memory limit
*/
if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
__func__, var->yres_virtual);
return -ENOMEM;
}
return 0;
}
int bfin_bf54x_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
if (nocursor)
return 0;
else
return -EINVAL; /* just to force soft_cursor() call */
}
static int bfin_bf54x_fb_setcolreg(u_int regno, u_int red, u_int green,
u_int blue, u_int transp,
struct fb_info *info)
{
if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
return -EINVAL;
if (info->var.grayscale) {
/* grayscale = 0.30*R + 0.59*G + 0.11*B */
red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
}
if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
u32 value;
/* Place color in the pseudopalette */
if (regno > 16)
return -EINVAL;
red >>= (16 - info->var.red.length);
green >>= (16 - info->var.green.length);
blue >>= (16 - info->var.blue.length);
value = (red << info->var.red.offset) |
(green << info->var.green.offset) |
(blue << info->var.blue.offset);
value &= 0xFFFFFF;
((u32 *) (info->pseudo_palette))[regno] = value;
}
return 0;
}
static struct fb_ops bfin_bf54x_fb_ops = {
.owner = THIS_MODULE,
.fb_open = bfin_bf54x_fb_open,
.fb_release = bfin_bf54x_fb_release,
.fb_check_var = bfin_bf54x_fb_check_var,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_cursor = bfin_bf54x_fb_cursor,
.fb_setcolreg = bfin_bf54x_fb_setcolreg,
};
#ifndef NO_BL_SUPPORT
static int bl_get_brightness(struct backlight_device *bd)
{
return 0;
}
static const struct backlight_ops bfin_lq043fb_bl_ops = {
.get_brightness = bl_get_brightness,
};
static struct backlight_device *bl_dev;
static int bfin_lcd_get_power(struct lcd_device *dev)
{
return 0;
}
static int bfin_lcd_set_power(struct lcd_device *dev, int power)
{
return 0;
}
static int bfin_lcd_get_contrast(struct lcd_device *dev)
{
return 0;
}
static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
{
return 0;
}
static int bfin_lcd_check_fb(struct lcd_device *dev, struct fb_info *fi)
{
if (!fi || (fi == &bfin_bf54x_fb))
return 1;
return 0;
}
static struct lcd_ops bfin_lcd_ops = {
.get_power = bfin_lcd_get_power,
.set_power = bfin_lcd_set_power,
.get_contrast = bfin_lcd_get_contrast,
.set_contrast = bfin_lcd_set_contrast,
.check_fb = bfin_lcd_check_fb,
};
static struct lcd_device *lcd_dev;
#endif
static irqreturn_t bfin_bf54x_irq_error(int irq, void *dev_id)
{
/*struct bfin_bf54xfb_info *info = dev_id;*/
u16 status = bfin_read_EPPI0_STATUS();
bfin_write_EPPI0_STATUS(0xFFFF);
if (status) {
bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() & ~EPPI_EN);
disable_dma(CH_EPPI0);
/* start dma */
enable_dma(CH_EPPI0);
bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN);
bfin_write_EPPI0_STATUS(0xFFFF);
}
return IRQ_HANDLED;
}
static int bfin_bf54x_probe(struct platform_device *pdev)
{
#ifndef NO_BL_SUPPORT
struct backlight_properties props;
#endif
struct bfin_bf54xfb_info *info;
struct fb_info *fbinfo;
int ret;
printk(KERN_INFO DRIVER_NAME ": FrameBuffer initializing...\n");
if (request_dma(CH_EPPI0, "CH_EPPI0") < 0) {
printk(KERN_ERR DRIVER_NAME
": couldn't request CH_EPPI0 DMA\n");
ret = -EFAULT;
goto out1;
}
fbinfo =
framebuffer_alloc(sizeof(struct bfin_bf54xfb_info), &pdev->dev);
if (!fbinfo) {
ret = -ENOMEM;
goto out2;
}
info = fbinfo->par;
info->fb = fbinfo;
info->dev = &pdev->dev;
spin_lock_init(&info->lock);
platform_set_drvdata(pdev, fbinfo);
strcpy(fbinfo->fix.id, driver_name);
info->mach_info = pdev->dev.platform_data;
if (info->mach_info == NULL) {
dev_err(&pdev->dev,
"no platform data for lcd, cannot attach\n");
ret = -EINVAL;
goto out3;
}
fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
fbinfo->fix.type_aux = 0;
fbinfo->fix.xpanstep = 0;
fbinfo->fix.ypanstep = 0;
fbinfo->fix.ywrapstep = 0;
fbinfo->fix.accel = FB_ACCEL_NONE;
fbinfo->fix.visual = FB_VISUAL_TRUECOLOR;
fbinfo->var.nonstd = 0;
fbinfo->var.activate = FB_ACTIVATE_NOW;
fbinfo->var.height = info->mach_info->height;
fbinfo->var.width = info->mach_info->width;
fbinfo->var.accel_flags = 0;
fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
fbinfo->fbops = &bfin_bf54x_fb_ops;
fbinfo->flags = FBINFO_FLAG_DEFAULT;
fbinfo->var.xres = info->mach_info->xres.defval;
fbinfo->var.xres_virtual = info->mach_info->xres.defval;
fbinfo->var.yres = info->mach_info->yres.defval;
fbinfo->var.yres_virtual = info->mach_info->yres.defval;
fbinfo->var.bits_per_pixel = info->mach_info->bpp.defval;
fbinfo->var.upper_margin = 0;
fbinfo->var.lower_margin = 0;
fbinfo->var.vsync_len = 0;
fbinfo->var.left_margin = 0;
fbinfo->var.right_margin = 0;
fbinfo->var.hsync_len = 0;
fbinfo->var.red.offset = 16;
fbinfo->var.green.offset = 8;
fbinfo->var.blue.offset = 0;
fbinfo->var.transp.offset = 0;
fbinfo->var.red.length = 8;
fbinfo->var.green.length = 8;
fbinfo->var.blue.length = 8;
fbinfo->var.transp.length = 0;
fbinfo->fix.smem_len = info->mach_info->xres.max *
info->mach_info->yres.max * info->mach_info->bpp.max / 8;
fbinfo->fix.line_length = fbinfo->var.xres_virtual *
fbinfo->var.bits_per_pixel / 8;
info->fb_buffer =
dma_alloc_coherent(NULL, fbinfo->fix.smem_len, &info->dma_handle,
GFP_KERNEL);
if (NULL == info->fb_buffer) {
printk(KERN_ERR DRIVER_NAME
": couldn't allocate dma buffer.\n");
ret = -ENOMEM;
goto out3;
}
fbinfo->screen_base = (void *)info->fb_buffer;
fbinfo->fix.smem_start = (int)info->fb_buffer;
fbinfo->fbops = &bfin_bf54x_fb_ops;
fbinfo->pseudo_palette = devm_kzalloc(&pdev->dev, sizeof(u32) * 16,
GFP_KERNEL);
if (!fbinfo->pseudo_palette) {
printk(KERN_ERR DRIVER_NAME
"Fail to allocate pseudo_palette\n");
ret = -ENOMEM;
goto out4;
}
if (fb_alloc_cmap(&fbinfo->cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0)
< 0) {
printk(KERN_ERR DRIVER_NAME
"Fail to allocate colormap (%d entries)\n",
BFIN_LCD_NBR_PALETTE_ENTRIES);
ret = -EFAULT;
goto out4;
}
if (request_ports(info)) {
printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n");
ret = -EFAULT;
goto out6;
}
info->irq = platform_get_irq(pdev, 0);
if (info->irq < 0) {
ret = -EINVAL;
goto out7;
}
if (request_irq(info->irq, bfin_bf54x_irq_error, 0,
"PPI ERROR", info) < 0) {
printk(KERN_ERR DRIVER_NAME
": unable to request PPI ERROR IRQ\n");
ret = -EFAULT;
goto out7;
}
if (register_framebuffer(fbinfo) < 0) {
printk(KERN_ERR DRIVER_NAME
": unable to register framebuffer.\n");
ret = -EINVAL;
goto out8;
}
#ifndef NO_BL_SUPPORT
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = 255;
bl_dev = backlight_device_register("bf54x-bl", NULL, NULL,
&bfin_lq043fb_bl_ops, &props);
if (IS_ERR(bl_dev)) {
printk(KERN_ERR DRIVER_NAME
": unable to register backlight.\n");
ret = -EINVAL;
unregister_framebuffer(fbinfo);
goto out8;
}
lcd_dev = lcd_device_register(DRIVER_NAME, &pdev->dev, NULL, &bfin_lcd_ops);
lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
#endif
return 0;
out8:
free_irq(info->irq, info);
out7:
free_ports(info);
out6:
fb_dealloc_cmap(&fbinfo->cmap);
out4:
dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
info->dma_handle);
out3:
framebuffer_release(fbinfo);
out2:
free_dma(CH_EPPI0);
out1:
return ret;
}
static int bfin_bf54x_remove(struct platform_device *pdev)
{
struct fb_info *fbinfo = platform_get_drvdata(pdev);
struct bfin_bf54xfb_info *info = fbinfo->par;
free_dma(CH_EPPI0);
free_irq(info->irq, info);
if (info->fb_buffer != NULL)
dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
info->dma_handle);
fb_dealloc_cmap(&fbinfo->cmap);
#ifndef NO_BL_SUPPORT
lcd_device_unregister(lcd_dev);
backlight_device_unregister(bl_dev);
#endif
unregister_framebuffer(fbinfo);
free_ports(info);
printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n");
return 0;
}
#ifdef CONFIG_PM
static int bfin_bf54x_suspend(struct platform_device *pdev, pm_message_t state)
{
bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() & ~EPPI_EN);
disable_dma(CH_EPPI0);
bfin_write_EPPI0_STATUS(0xFFFF);
return 0;
}
static int bfin_bf54x_resume(struct platform_device *pdev)
{
struct fb_info *fbinfo = platform_get_drvdata(pdev);
struct bfin_bf54xfb_info *info = fbinfo->par;
if (info->lq043_open_cnt) {
bfin_write_EPPI0_CONTROL(0);
SSYNC();
config_dma(info);
config_ppi(info);
/* start dma */
enable_dma(CH_EPPI0);
bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN);
}
return 0;
}
#else
#define bfin_bf54x_suspend NULL
#define bfin_bf54x_resume NULL
#endif
static struct platform_driver bfin_bf54x_driver = {
.probe = bfin_bf54x_probe,
.remove = bfin_bf54x_remove,
.suspend = bfin_bf54x_suspend,
.resume = bfin_bf54x_resume,
.driver = {
.name = DRIVER_NAME,
},
};
module_platform_driver(bfin_bf54x_driver);
MODULE_DESCRIPTION("Blackfin BF54x TFT LCD Driver");
MODULE_LICENSE("GPL");
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