flexfb.c

/*
 * Generic FB driver for TFT LCD displays
 *
 * Copyright (C) 2013 Noralf Tronnes
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/delay.h>

#include "fbtft.h"

#define DRVNAME	    "flexfb"


static char *chip = NULL;
module_param(chip, charp, 0);
MODULE_PARM_DESC(chip, "LCD controller");

static unsigned int width = 0;
module_param(width, uint, 0);
MODULE_PARM_DESC(width, "Display width");

static unsigned int height = 0;
module_param(height, uint, 0);
MODULE_PARM_DESC(height, "Display height");

static int init[512];
static int init_num = 0;
module_param_array(init, int, &init_num, 0);
MODULE_PARM_DESC(init, "Init sequence");

static unsigned int setaddrwin = 0;
module_param(setaddrwin, uint, 0);
MODULE_PARM_DESC(setaddrwin, "Which set_addr_win() implementation to use");

static unsigned int buswidth = 8;
module_param(buswidth, uint, 0);
MODULE_PARM_DESC(buswidth, "Width of databus (default: 8)");

static unsigned int regwidth = 8;
module_param(regwidth, uint, 0);
MODULE_PARM_DESC(regwidth, "Width of controller register (default: 8)");

static bool nobacklight = false;
module_param(nobacklight, bool, 0);
MODULE_PARM_DESC(nobacklight, "Turn off backlight functionality.");

static bool latched = false;
module_param(latched, bool, 0);
MODULE_PARM_DESC(latched, "Use with latched 16-bit databus");


static int *initp = NULL;
static int initp_num = 0;

/* default init sequences */
static int st7735r_init[] = { \
-1,0x01,-2,150,-1,0x11,-2,500,-1,0xB1,0x01,0x2C,0x2D,-1,0xB2,0x01,0x2C,0x2D,-1,0xB3,0x01,0x2C,0x2D,0x01,0x2C,0x2D, \
-1,0xB4,0x07,-1,0xC0,0xA2,0x02,0x84,-1,0xC1,0xC5,-1,0xC2,0x0A,0x00,-1,0xC3,0x8A,0x2A,-1,0xC4,0x8A,0xEE,-1,0xC5,0x0E, \
-1,0x20,-1,0x36,0xC0,-1,0x3A,0x05,-1,0xE0,0x0f,0x1a,0x0f,0x18,0x2f,0x28,0x20,0x22,0x1f,0x1b,0x23,0x37,0x00,0x07,0x02,0x10, \
-1,0xE1,0x0f,0x1b,0x0f,0x17,0x33,0x2c,0x29,0x2e,0x30,0x30,0x39,0x3f,0x00,0x07,0x03,0x10,-1,0x29,-2,100,-1,0x13,-2,10,-3 };

static int ssd1289_init[] = { \
-1,0x00,0x0001,-1,0x03,0xA8A4,-1,0x0C,0x0000,-1,0x0D,0x080C,-1,0x0E,0x2B00,-1,0x1E,0x00B7,-1,0x01,0x2B3F,-1,0x02,0x0600, \
-1,0x10,0x0000,-1,0x11,0x6070,-1,0x05,0x0000,-1,0x06,0x0000,-1,0x16,0xEF1C,-1,0x17,0x0003,-1,0x07,0x0233,-1,0x0B,0x0000, \
-1,0x0F,0x0000,-1,0x41,0x0000,-1,0x42,0x0000,-1,0x48,0x0000,-1,0x49,0x013F,-1,0x4A,0x0000,-1,0x4B,0x0000,-1,0x44,0xEF00, \
-1,0x45,0x0000,-1,0x46,0x013F,-1,0x30,0x0707,-1,0x31,0x0204,-1,0x32,0x0204,-1,0x33,0x0502,-1,0x34,0x0507,-1,0x35,0x0204, \
-1,0x36,0x0204,-1,0x37,0x0502,-1,0x3A,0x0302,-1,0x3B,0x0302,-1,0x23,0x0000,-1,0x24,0x0000,-1,0x25,0x8000,-1,0x4f,0x0000, \
-1,0x4e,0x0000,-1,0x22,-3 };

static int hx8340bn_init[] = { \
-1,0xC1,0xFF,0x83,0x40,-1,0x11,-2,150,-1,0xCA,0x70,0x00,0xD9,-1,0xB0,0x01,0x11, \
-1,0xC9,0x90,0x49,0x10,0x28,0x28,0x10,0x00,0x06,-2,20,-1,0xC2,0x60,0x71,0x01,0x0E,0x05,0x02,0x09,0x31,0x0A, \
-1,0xC3,0x67,0x30,0x61,0x17,0x48,0x07,0x05,0x33,-2,10,-1,0xB5,0x35,0x20,0x45,-1,0xB4,0x33,0x25,0x4C,-2,10, \
-1,0x3A,0x05,-1,0x29,-2,10,-3 };

static int ili9225_init[] = { \
-1,0x0001,0x011C,-1,0x0002,0x0100,-1,0x0003,0x1030,-1,0x0008,0x0808,-1,0x000C,0x0000,-1,0x000F,0x0A01,-1,0x0020,0x0000, \
-1,0x0021,0x0000,-2,50,-1,0x0010,0x0A00,-1,0x0011,0x1038,-2,50,-1,0x0012,0x1121,-1,0x0013,0x004E,-1,0x0014,0x676F, \
-1,0x0030,0x0000,-1,0x0031,0x00DB,-1,0x0032,0x0000,-1,0x0033,0x0000,-1,0x0034,0x00DB,-1,0x0035,0x0000,-1,0x0036,0x00AF, \
-1,0x0037,0x0000,-1,0x0038,0x00DB,-1,0x0039,0x0000,-1,0x0050,0x0000,-1,0x0051,0x060A,-1,0x0052,0x0D0A,-1,0x0053,0x0303, \
-1,0x0054,0x0A0D,-1,0x0055,0x0A06,-1,0x0056,0x0000,-1,0x0057,0x0303,-1,0x0058,0x0000,-1,0x0059,0x0000,-2,50, \
-1,0x0007,0x1017,-2,50,-3 };

static int ili9320_init[] = { \
-1,0x00E5,0x8000,-1,0x0000,0x0001,-1,0x0001,0x0100,-1,0x0002,0x0700,-1,0x0003,0x1030,-1,0x0004,0x0000,-1,0x0008,0x0202, \
-1,0x0009,0x0000,-1,0x000A,0x0000,-1,0x000C,0x0000,-1,0x000D,0x0000,-1,0x000F,0x0000,-1,0x0010,0x0000,-1,0x0011,0x0007, \
-1,0x0012,0x0000,-1,0x0013,0x0000,-2,200,-1,0x0010,0x17B0,-1,0x0011,0x0031,-2,50,-1,0x0012,0x0138,-2,50,-1,0x0013,0x1800, \
-1,0x0029,0x0008,-2,50,-1,0x0020,0x0000,-1,0x0021,0x0000,-1,0x0030,0x0000,-1,0x0031,0x0505,-1,0x0032,0x0004, \
-1,0x0035,0x0006,-1,0x0036,0x0707,-1,0x0037,0x0105,-1,0x0038,0x0002,-1,0x0039,0x0707,-1,0x003C,0x0704,-1,0x003D,0x0807, \
-1,0x0050,0x0000,-1,0x0051,0x00EF,-1,0x0052,0x0000,-1,0x0053,0x013F,-1,0x0060,0x2700,-1,0x0061,0x0001,-1,0x006A,0x0000, \
-1,0x0080,0x0000,-1,0x0081,0x0000,-1,0x0082,0x0000,-1,0x0083,0x0000,-1,0x0084,0x0000,-1,0x0085,0x0000,-1,0x0090,0x0010, \
-1,0x0092,0x0000,-1,0x0093,0x0003,-1,0x0095,0x0110,-1,0x0097,0x0000,-1,0x0098,0x0000,-1,0x0007,0x0173,-3 };

static int ili9325_init[] = { \
-1,0x00E3,0x3008,-1,0x00E7,0x0012,-1,0x00EF,0x1231,-1,0x0001,0x0100,-1,0x0002,0x0700,-1,0x0003,0x1030,-1,0x0004,0x0000, \
-1,0x0008,0x0207,-1,0x0009,0x0000,-1,0x000A,0x0000,-1,0x000C,0x0000,-1,0x000D,0x0000,-1,0x000F,0x0000,-1,0x0010,0x0000, \
-1,0x0011,0x0007,-1,0x0012,0x0000,-1,0x0013,0x0000,-2,200,-1,0x0010,0x1690,-1,0x0011,0x0223,-2,50,-1,0x0012,0x000D,-2,50, \
-1,0x0013,0x1200,-1,0x0029,0x000A,-1,0x002B,0x000C,-2,50,-1,0x0020,0x0000,-1,0x0021,0x0000,-1,0x0030,0x0000, \
-1,0x0031,0x0506,-1,0x0032,0x0104,-1,0x0035,0x0207,-1,0x0036,0x000F,-1,0x0037,0x0306,-1,0x0038,0x0102,-1,0x0039,0x0707, \
-1,0x003C,0x0702,-1,0x003D,0x1604,-1,0x0050,0x0000,-1,0x0051,0x00EF,-1,0x0052,0x0000,-1,0x0053,0x013F,-1,0x0060,0xA700, \
-1,0x0061,0x0001,-1,0x006A,0x0000,-1,0x0080,0x0000,-1,0x0081,0x0000,-1,0x0082,0x0000,-1,0x0083,0x0000,-1,0x0084,0x0000, \
-1,0x0085,0x0000,-1,0x0090,0x0010,-1,0x0092,0x0600,-1,0x0007,0x0133,-3 };

static int ili9341_init[] = { \
-1,0x28,-2,20,-1,0xCF,0x00,0x83,0x30,-1,0xED,0x64,0x03,0x12,0x81,-1,0xE8,0x85,0x01,0x79, \
-1,0xCB,0x39,0x2c,0x00,0x34,0x02,-1,0xF7,0x20,-1,0xEA,0x00,0x00,-1,0xC0,0x26,-1,0xC1,0x11, \
-1,0xC5,0x35,0x3E,-1,0xC7,0xBE,-1,0xB1,0x00,0x1B,-1,0xB6,0x0a,0x82,0x27,0x00,-1,0xB7,0x07, \
-1,0x3A,0x55,-1,0x36,0x48,-1,0x11,-2,120,-1,0x29,-2,20,-3 };

static int ssd1351_init[] = { -1,0xfd,0x12,-1,0xfd,0xb1,-1,0xae,-1,0xb3,0xf1,-1,0xca,0x7f,-1,0xa0,0x74, \
                              -1,0x15,0x00,0x7f,-1,0x75,0x00,0x7f,-1,0xa1,0x00,-1,0xa2,0x00,-1,0xb5,0x00, \
                              -1,0xab,0x01,-1,0xb1,0x32,-1,0xb4,0xa0,0xb5,0x55,-1,0xbb,0x17,-1,0xbe,0x05, \
                              -1,0xc1,0xc8,0x80,0xc8,-1,0xc7,0x0f,-1,0xb6,0x01,-1,0xa6,-1,0xaf,-3 };


/* ili9320, ili9325 */
static void flexfb_set_addr_win_1(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
	fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
	switch (par->info->var.rotate) {
	/* R20h = Horizontal GRAM Start Address */
	/* R21h = Vertical GRAM Start Address */
	case 0:
		write_reg(par, 0x0020, xs);
		write_reg(par, 0x0021, ys);
		break;
	case 180:
		write_reg(par, 0x0020, width - 1 - xs);
		write_reg(par, 0x0021, height - 1 - ys);
		break;
	case 270:
		write_reg(par, 0x0020, width - 1 - ys);
		write_reg(par, 0x0021, xs);
		break;
	case 90:
		write_reg(par, 0x0020, ys);
		write_reg(par, 0x0021, height - 1 - xs);
		break;
	}
	write_reg(par, 0x0022); /* Write Data to GRAM */
}

/* ssd1289 */
static void flexfb_set_addr_win_2(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
	fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);

	switch (par->info->var.rotate) {
	/* R4Eh - Set GDDRAM X address counter */
	/* R4Fh - Set GDDRAM Y address counter */
	case 0:
		write_reg(par, 0x4e, xs);
		write_reg(par, 0x4f, ys);
		break;
	case 180:
		write_reg(par, 0x4e, par->info->var.xres - 1 - xs);
		write_reg(par, 0x4f, par->info->var.yres - 1 - ys);
		break;
	case 270:
		write_reg(par, 0x4e, par->info->var.yres - 1 - ys);
		write_reg(par, 0x4f, xs);
		break;
	case 90:
		write_reg(par, 0x4e, ys);
		write_reg(par, 0x4f, par->info->var.xres - 1 - xs);
		break;
	}

	/* R22h - RAM data write */
	write_reg(par, 0x22, 0);
}

/* ssd1351 */
static void set_addr_win_3(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
	fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);

	write_reg(par, 0x15, xs, xe);
	write_reg(par, 0x75, ys, ye);
	write_reg(par, 0x5C);
}

static int flexfb_verify_gpios_dc(struct fbtft_par *par)
{
	fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);

	if (par->gpio.dc < 0) {
		dev_err(par->info->device, "Missing info about 'dc' gpio. Aborting.\n");
		return -EINVAL;
	}

	return 0;
}

static int flexfb_verify_gpios_db(struct fbtft_par *par)
{
	int i;
	int num_db = buswidth;

	fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);

	if (par->gpio.dc < 0) {
		dev_err(par->info->device, "Missing info about 'dc' gpio. Aborting.\n");
		return -EINVAL;
	}
	if (par->gpio.wr < 0) {
		dev_err(par->info->device, "Missing info about 'wr' gpio. Aborting.\n");
		return -EINVAL;
	}
	if (latched && (par->gpio.latch < 0)) {
		dev_err(par->info->device, "Missing info about 'latch' gpio. Aborting.\n");
		return -EINVAL;
	}
	if (latched)
		num_db=buswidth/2;
	for (i=0;i < num_db;i++) {
		if (par->gpio.db[i] < 0) {
			dev_err(par->info->device, "Missing info about 'db%02d' gpio. Aborting.\n", i);
			return -EINVAL;
		}
	}

	return 0;
}

static struct fbtft_display flex_display = { };

static int flexfb_probe_common(struct spi_device *sdev, struct platform_device *pdev)
{
	struct device *dev;
	struct fb_info *info;
	struct fbtft_par *par;
	int ret;

	initp = init;
	initp_num = init_num;

	if (sdev)
		dev = &sdev->dev;
	else
		dev = &pdev->dev;

	fbtft_init_dbg(dev, "%s(%s)\n", __func__, sdev ? "'SPI device'" : "'Platform device'");

	if (chip) {

		if (!strcmp(chip, "st7735r")) {
			if (!width)
				width = 128;
			if (!height)
				height = 160;
			if (init_num == 0) {
				initp = st7735r_init;
				initp_num = ARRAY_SIZE(st7735r_init);
			}


		} else if (!strcmp(chip, "hx8340bn")) {
			if (!width)
				width = 176;
			if (!height)
				height = 220;
			setaddrwin = 0;
			if (init_num == 0) {
				initp = hx8340bn_init;
				initp_num = ARRAY_SIZE(hx8340bn_init);
			}


		} else if (!strcmp(chip, "ili9225")) {
			if (!width)
				width = 176;
			if (!height)
				height = 220;
			setaddrwin = 0;
			regwidth = 16;
			if (init_num == 0) {
				initp = ili9225_init;
				initp_num = ARRAY_SIZE(ili9225_init);
			}



		} else if (!strcmp(chip, "ili9320")) {
			if (!width)
				width = 240;
			if (!height)
				height = 320;
			setaddrwin = 1;
			regwidth = 16;
			if (init_num == 0) {
				initp = ili9320_init;
				initp_num = ARRAY_SIZE(ili9320_init);
			}


		} else if (!strcmp(chip, "ili9325")) {
			if (!width)
				width = 240;
			if (!height)
				height = 320;
			setaddrwin = 1;
			regwidth = 16;
			if (init_num == 0) {
				initp = ili9325_init;
				initp_num = ARRAY_SIZE(ili9325_init);
			}

		} else if (!strcmp(chip, "ili9341")) {
			if (!width)
				width = 240;
			if (!height)
				height = 320;
			setaddrwin = 0;
			regwidth = 8;
			if (init_num == 0) {
				initp = ili9341_init;
				initp_num = ARRAY_SIZE(ili9341_init);
			}


		} else if (!strcmp(chip, "ssd1289")) {
			if (!width)
				width = 240;
			if (!height)
				height = 320;
			setaddrwin = 2;
			regwidth = 16;
			if (init_num == 0) {
				initp = ssd1289_init;
				initp_num = ARRAY_SIZE(ssd1289_init);
			}



		} else if (!strcmp(chip, "ssd1351")) {
			if (!width)
				width = 128;
			if (!height)
				height = 128;
			setaddrwin = 3;
			if (init_num == 0) {
				initp = ssd1351_init;
				initp_num = ARRAY_SIZE(ssd1351_init);
			}
		} else {
			dev_err(dev, "chip=%s is not supported\n", chip);
			return -EINVAL;
		}
	}

	if (width == 0 || height == 0) {
		dev_err(dev, "argument(s) missing: width and height has to be set.\n");
		return -EINVAL;
	}
	flex_display.width = width;
	flex_display.height = height;
	fbtft_init_dbg(dev, "Display resolution: %dx%d\n", width, height);
	fbtft_init_dbg(dev, "chip = %s\n", chip ? chip : "not set");
	fbtft_init_dbg(dev, "setaddrwin = %d\n", setaddrwin);
	fbtft_init_dbg(dev, "regwidth = %d\n", regwidth);
	fbtft_init_dbg(dev, "buswidth = %d\n", buswidth);

	info = fbtft_framebuffer_alloc(&flex_display, dev);
	if (!info)
		return -ENOMEM;

	par = info->par;
	if (sdev)
		par->spi = sdev;
	else
		par->pdev = pdev;
	if (!par->init_sequence)
		par->init_sequence = initp;
	par->fbtftops.init_display = fbtft_init_display;

	/* registerwrite functions */
	switch (regwidth) {
	case 8:
		par->fbtftops.write_register = fbtft_write_reg8_bus8;
		break;
	case 16:
		par->fbtftops.write_register = fbtft_write_reg16_bus8;
		break;
	default:
		dev_err(dev, "argument 'regwidth': %d is not supported.\n", regwidth);
		return -EINVAL;
	}

	/* bus functions */
	if (sdev) {
		switch (buswidth) {
		case 8:
			par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
			if (!par->startbyte)
				par->fbtftops.verify_gpios = flexfb_verify_gpios_dc;
			break;
		case 9:
			if (regwidth == 16) {
				dev_err(dev, "argument 'regwidth': %d is not supported with buswidth=%d and SPI.\n", regwidth, buswidth);
				return -EINVAL;
			}
			par->fbtftops.write_register = fbtft_write_reg8_bus9;
			par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
			sdev->bits_per_word=9;
			ret = sdev->master->setup(sdev);
			if (ret) {
				dev_err(dev, "SPI 9-bit setup failed: %d.\n", ret);
				return ret;
			}
			break;
		default:
			dev_err(dev, "argument 'buswidth': %d is not supported with SPI.\n", buswidth);
			return -EINVAL;
		}
		par->fbtftops.write = fbtft_write_spi;
	} else {
		par->fbtftops.verify_gpios = flexfb_verify_gpios_db;
		switch (buswidth) {
		case 8:
			par->fbtftops.write = fbtft_write_gpio8_wr;
			par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
			break;
		case 16:
			par->fbtftops.write_register = fbtft_write_reg16_bus16;
			if (latched)
				par->fbtftops.write = fbtft_write_gpio16_wr_latched;
			else
				par->fbtftops.write = fbtft_write_gpio16_wr;
			par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
			break;
		default:
			dev_err(dev, "argument 'buswidth': %d is not supported with parallel.\n", buswidth);
			return -EINVAL;
		}
	}

	/* set_addr_win function */
	switch (setaddrwin) {
	case 0:
		/* use default */
		break;
	case 1:
		par->fbtftops.set_addr_win = flexfb_set_addr_win_1;
		break;
	case 2:
		par->fbtftops.set_addr_win = flexfb_set_addr_win_2;
		break;
	case 3:
		par->fbtftops.set_addr_win = set_addr_win_3;
		break;
	default:
		dev_err(dev, "argument 'setaddrwin': unknown value %d.\n", setaddrwin);
		return -EINVAL;
	}

	if (!nobacklight)
		par->fbtftops.register_backlight = fbtft_register_backlight;

	ret = fbtft_register_framebuffer(info);
	if (ret < 0)
		goto out_release;

	return 0;

out_release:
	fbtft_framebuffer_release(info);

	return ret;
}

static int flexfb_remove_common(struct device *dev, struct fb_info *info)
{
	fbtft_init_dbg(dev, "%s()\n", __func__);

	if (info) {
		fbtft_unregister_framebuffer(info);
		fbtft_framebuffer_release(info);
	}

	return 0;
}

static int flexfb_probe_spi(struct spi_device *spi)
{
	return flexfb_probe_common(spi, NULL);
}

static int flexfb_remove_spi(struct spi_device *spi)
{
	struct fb_info *info = spi_get_drvdata(spi);

	return flexfb_remove_common(&spi->dev, info);
}

static int flexfb_probe_pdev(struct platform_device *pdev)
{
	return flexfb_probe_common(NULL, pdev);
}

static int flexfb_remove_pdev(struct platform_device *pdev)
{
	struct fb_info *info = platform_get_drvdata(pdev);

	return flexfb_remove_common(&pdev->dev, info);
}

static struct spi_driver flexfb_spi_driver = {
	.driver = {
		.name   = DRVNAME,
		.owner  = THIS_MODULE,
	},
	.probe  = flexfb_probe_spi,
	.remove = flexfb_remove_spi,
};

static const struct platform_device_id flexfb_platform_ids[] = {
	{ "flexpfb", 0 },
	{ },
};

static struct platform_driver flexfb_platform_driver = {
	.driver = {
		.name   = DRVNAME,
		.owner  = THIS_MODULE,
	},
	.id_table = flexfb_platform_ids,
	.probe  = flexfb_probe_pdev,
	.remove = flexfb_remove_pdev,
};

static int __init flexfb_init(void)
{
	int ret, ret2;

	ret = spi_register_driver(&flexfb_spi_driver);
	ret2 = platform_driver_register(&flexfb_platform_driver);
	if (ret < 0)
		return ret;
	return ret2;
}

static void __exit flexfb_exit(void)
{
	spi_unregister_driver(&flexfb_spi_driver);
	platform_driver_unregister(&flexfb_platform_driver);
}

/* ------------------------------------------------------------------------- */

module_init(flexfb_init);
module_exit(flexfb_exit);

MODULE_DESCRIPTION("Generic FB driver for TFT LCD displays");
MODULE_AUTHOR("Noralf Tronnes");
MODULE_LICENSE("GPL");