[net-next-2.6.git] / drivers / video / epson1355fb.c

/*
 * linux/drivers/video/epson1355fb.c -- Epson S1D13505 frame buffer for 2.5.
 *
 * Epson Research S1D13505 Embedded RAMDAC LCD/CRT Controller
 *   (previously known as SED1355)
 *
 * Cf. http://www.erd.epson.com/vdc/html/S1D13505.html
 *
 *
 * Copyright (C) Hewlett-Packard Company.  All rights reserved.
 *
 * Written by Christopher Hoover <ch@hpl.hp.com>
 *
 * Adapted from:
 *
 *  linux/drivers/video/skeletonfb.c
 *  Modified to new api Jan 2001 by James Simmons (jsimmons@infradead.org)
 *  Created 28 Dec 1997 by Geert Uytterhoeven
 *
 *  linux/drivers/video/epson1355fb.c (2.4 driver)
 *  Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file COPYING in the main directory of this archive for
 * more details.
 *
 *
 * Noteworthy Issues
 * -----------------
 *
 * This driver is complicated by the fact that this is a 16-bit chip
 * and, on at least one platform (ceiva), we can only do 16-bit reads
 * and writes to the framebuffer.  We hide this from user space
 * except in the case of mmap().
 *
 *
 * To Do
 * -----
 *
 * - Test 8-bit pseudocolor mode
 * - Allow setting bpp, virtual resolution
 * - Implement horizontal panning
 * - (maybe) Implement hardware cursor
 */

#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/ioport.h>
#include <linux/platform_device.h>

#include <asm/types.h>
#include <asm/io.h>
#include <asm/uaccess.h>

#include <video/epson1355.h>

struct epson1355_par {
	unsigned long reg_addr;
};

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

#ifdef CONFIG_SUPERH

static inline u8 epson1355_read_reg(int index)
{
	return ctrl_inb(par.reg_addr + index);
}

static inline void epson1355_write_reg(u8 data, int index)
{
	ctrl_outb(data, par.reg_addr + index);
}

#elif defined(CONFIG_ARM)

# ifdef CONFIG_ARCH_CEIVA
#  include <asm/arch/hardware.h>
#  define EPSON1355FB_BASE_PHYS	(CEIVA_PHYS_SED1355)
# endif

static inline u8 epson1355_read_reg(struct epson1355_par *par, int index)
{
	return __raw_readb(par->reg_addr + index);
}

static inline void epson1355_write_reg(struct epson1355_par *par, u8 data, int index)
{
	__raw_writeb(data, par->reg_addr + index);
}

#else
# error "no architecture-specific epson1355_{read,write}_reg"
#endif

#ifndef EPSON1355FB_BASE_PHYS
# error  "EPSON1355FB_BASE_PHYS is not defined"
#endif

#define EPSON1355FB_REGS_OFS	(0)
#define EPSON1355FB_REGS_PHYS	(EPSON1355FB_BASE_PHYS + EPSON1355FB_REGS_OFS)
#define EPSON1355FB_REGS_LEN	(64)

#define EPSON1355FB_FB_OFS	(0x00200000)
#define EPSON1355FB_FB_PHYS	(EPSON1355FB_BASE_PHYS + EPSON1355FB_FB_OFS)
#define EPSON1355FB_FB_LEN	(2 * 1024 * 1024)

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

static inline u16 epson1355_read_reg16(struct epson1355_par *par, int index)
{
	u8 lo = epson1355_read_reg(par, index);
	u8 hi = epson1355_read_reg(par, index + 1);

	return (hi << 8) | lo;
}

static inline void epson1355_write_reg16(struct epson1355_par *par, u16 data, int index)
{
	u8 lo = data & 0xff;
	u8 hi = (data >> 8) & 0xff;

	epson1355_write_reg(par, lo, index);
	epson1355_write_reg(par, hi, index + 1);
}

static inline u32 epson1355_read_reg20(struct epson1355_par *par, int index)
{
	u8 b0 = epson1355_read_reg(par, index);
	u8 b1 = epson1355_read_reg(par, index + 1);
	u8 b2 = epson1355_read_reg(par, index + 2);

	return (b2 & 0x0f) << 16 | (b1 << 8) | b0;
}

static inline void epson1355_write_reg20(struct epson1355_par *par, u32 data, int index)
{
	u8 b0 = data & 0xff;
	u8 b1 = (data >> 8) & 0xff;
	u8 b2 = (data >> 16) & 0x0f;

	epson1355_write_reg(par, b0, index);
	epson1355_write_reg(par, b1, index + 1);
	epson1355_write_reg(par, b2, index + 2);
}

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

static void set_lut(struct epson1355_par *par, u8 index, u8 r, u8 g, u8 b)
{
	epson1355_write_reg(par, index, REG_LUT_ADDR);
	epson1355_write_reg(par, r, REG_LUT_DATA);
	epson1355_write_reg(par, g, REG_LUT_DATA);
	epson1355_write_reg(par, b, REG_LUT_DATA);
}


/**
 *  	epson1355fb_setcolreg - sets a color register.
 *      @regno: Which register in the CLUT we are programming
 *      @red: The red value which can be up to 16 bits wide
 *	@green: The green value which can be up to 16 bits wide
 *	@blue:  The blue value which can be up to 16 bits wide.
 *	@transp: If supported the alpha value which can be up to 16 bits wide.
 *      @info: frame buffer info structure
 *
 *	Returns negative errno on error, or zero on success.
 */
static int epson1355fb_setcolreg(unsigned regno, unsigned r, unsigned g,
				 unsigned b, unsigned transp,
				 struct fb_info *info)
{
	struct epson1355_par *par = info->par;

	if (info->var.grayscale)
		r = g = b = (19595 * r + 38470 * g + 7471 * b) >> 16;

	switch (info->fix.visual) {
	case FB_VISUAL_TRUECOLOR:
		if (regno >= 16)
			return -EINVAL;

		((u32 *) info->pseudo_palette)[regno] =
		    (r & 0xf800) | (g & 0xfc00) >> 5 | (b & 0xf800) >> 11;

		break;
	case FB_VISUAL_PSEUDOCOLOR:
		if (regno >= 256)
			return -EINVAL;

		set_lut(par, regno, r >> 8, g >> 8, b >> 8);

		break;
	default:
		return -ENOSYS;
	}
	return 0;
}

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

/**
 *      epson1355fb_pan_display - Pans the display.
 *      @var: frame buffer variable screen structure
 *      @info: frame buffer structure that represents a single frame buffer
 *
 *	Pan (or wrap, depending on the `vmode' field) the display using the
 *  	`xoffset' and `yoffset' fields of the `var' structure.
 *  	If the values don't fit, return -EINVAL.
 *
 *      Returns negative errno on error, or zero on success.
 */
static int epson1355fb_pan_display(struct fb_var_screeninfo *var,
				   struct fb_info *info)
{
	struct epson1355_par *par = info->par;
	u32 start;

	if (var->xoffset != 0)	/* not yet ... */
		return -EINVAL;

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

	start = (info->fix.line_length >> 1) * var->yoffset;

	epson1355_write_reg20(par, start, REG_SCRN1_DISP_START_ADDR0);

	return 0;
}

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

static void lcd_enable(struct epson1355_par *par, int enable)
{
	u8 mode = epson1355_read_reg(par, REG_DISPLAY_MODE);

	if (enable)
		mode |= 1;
	else
		mode &= ~1;

	epson1355_write_reg(par, mode, REG_DISPLAY_MODE);
}

#if defined(CONFIG_ARCH_CEIVA)
static void backlight_enable(int enable)
{
	/* ### this should be protected by a spinlock ... */
	u8 pddr = clps_readb(PDDR);
	if (enable)
		pddr |= (1 << 5);
	else
		pddr &= ~(1 << 5);
	clps_writeb(pddr, PDDR);
}
#else
static void backlight_enable(int enable)
{
}
#endif


/**
 *      epson1355fb_blank - blanks the display.
 *      @blank_mode: the blank mode we want.
 *      @info: frame buffer structure that represents a single frame buffer
 *
 *      Blank the screen if blank_mode != 0, else unblank. Return 0 if
 *      blanking succeeded, != 0 if un-/blanking failed due to e.g. a
 *      video mode which doesn't support it. Implements VESA suspend
 *      and powerdown modes on hardware that supports disabling hsync/vsync:
 *      blank_mode == 2: suspend vsync
 *      blank_mode == 3: suspend hsync
 *      blank_mode == 4: powerdown
 *
 *      Returns negative errno on error, or zero on success.
 *
 */
static int epson1355fb_blank(int blank_mode, struct fb_info *info)
{
	struct epson1355_par *par = info->par;

	switch (blank_mode) {
	case FB_BLANK_UNBLANKING:
	case FB_BLANK_NORMAL:
		lcd_enable(par, 1);
		backlight_enable(1);
		break;
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
		backlight_enable(0);
		break;
	case FB_BLANK_POWERDOWN:
		backlight_enable(0);
		lcd_enable(par, 0);
		break;
	default:
		return -EINVAL;
	}

	/* let fbcon do a soft blank for us */
	return (blank_mode == FB_BLANK_NORMAL) ? 1 : 0;
}

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

/*
 * We can't use the cfb generic routines, as we have to limit
 * ourselves to 16-bit or 8-bit loads and stores to this 16-bit
 * chip.
 */

static inline void epson1355fb_fb_writel(unsigned long v, unsigned long *a)
{
	u16 *p = (u16 *) a;
	u16 l = v & 0xffff;
	u16 h = v >> 16;

	fb_writew(l, p);
	fb_writew(h, p + 1);
}

static inline unsigned long epson1355fb_fb_readl(const unsigned long *a)
{
	const u16 *p = (u16 *) a;
	u16 l = fb_readw(p);
	u16 h = fb_readw(p + 1);

	return (h << 16) | l;
}

#define FB_READL epson1355fb_fb_readl
#define FB_WRITEL epson1355fb_fb_writel

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

static inline unsigned long copy_from_user16(void *to, const void *from,
					     unsigned long n)
{
	u16 *dst = (u16 *) to;
	u16 *src = (u16 *) from;

	if (!access_ok(VERIFY_READ, from, n))
		return n;

	while (n > 1) {
		u16 v;
		if (__get_user(v, src))
			return n;

		fb_writew(v, dst);

		src++, dst++;
		n -= 2;
	}

	if (n) {
		u8 v;

		if (__get_user(v, ((u8 *) src)))
			return n;

		fb_writeb(v, dst);
	}
	return 0;
}

static inline unsigned long copy_to_user16(void *to, const void *from,
					   unsigned long n)
{
	u16 *dst = (u16 *) to;
	u16 *src = (u16 *) from;

	if (!access_ok(VERIFY_WRITE, to, n))
		return n;

	while (n > 1) {
		u16 v = fb_readw(src);

		if (__put_user(v, dst))
			return n;

		src++, dst++;
		n -= 2;
	}

	if (n) {
		u8 v = fb_readb(src);

		if (__put_user(v, ((u8 *) dst)))
			return n;
	}
	return 0;
}


static ssize_t
epson1355fb_read(struct fb_info *info, char *buf, size_t count, loff_t * ppos)
{
	unsigned long p = *ppos;

	if (p >= info->fix.smem_len)
		return 0;
	if (count >= info->fix.smem_len)
		count = info->fix.smem_len;
	if (count + p > info->fix.smem_len)
		count = info->fix.smem_len - p;

	if (count) {
		char *base_addr;

		base_addr = info->screen_base;
		count -= copy_to_user16(buf, base_addr + p, count);
		if (!count)
			return -EFAULT;
		*ppos += count;
	}
	return count;
}

static ssize_t
epson1355fb_write(struct fb_info *info, const char *buf,
		  size_t count, loff_t * ppos)
{
	unsigned long p = *ppos;
	int err;

	/* from fbmem.c except for our own copy_*_user */
	if (p > info->fix.smem_len)
		return -ENOSPC;
	if (count >= info->fix.smem_len)
		count = info->fix.smem_len;
	err = 0;
	if (count + p > info->fix.smem_len) {
		count = info->fix.smem_len - p;
		err = -ENOSPC;
	}

	if (count) {
		char *base_addr;

		base_addr = info->screen_base;
		count -= copy_from_user16(base_addr + p, buf, count);
		*ppos += count;
		err = -EFAULT;
	}
	if (count)
		return count;
	return err;
}

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

static struct fb_ops epson1355fb_fbops = {
	.owner 		= THIS_MODULE,
	.fb_setcolreg 	= epson1355fb_setcolreg,
	.fb_pan_display = epson1355fb_pan_display,
	.fb_blank 	= epson1355fb_blank,
	.fb_fillrect 	= cfb_fillrect,
	.fb_copyarea 	= cfb_copyarea,
	.fb_imageblit 	= cfb_imageblit,
	.fb_read 	= epson1355fb_read,
	.fb_write 	= epson1355fb_write,
};

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

static __init unsigned int get_fb_size(struct fb_info *info)
{
	unsigned int size = 2 * 1024 * 1024;
	char *p = info->screen_base;

	/* the 512k framebuffer is aliased at start + 0x80000 * n */
	fb_writeb(1, p);
	fb_writeb(0, p + 0x80000);
	if (!fb_readb(p))
		size = 512 * 1024;

	fb_writeb(0, p);

	return size;
}

static int epson1355_width_tab[2][4] __initdata =
    { {4, 8, 16, -1}, {9, 12, 16, -1} };
static int epson1355_bpp_tab[8] __initdata = { 1, 2, 4, 8, 15, 16 };

static void __init fetch_hw_state(struct fb_info *info, struct epson1355_par *par)
{
	struct fb_var_screeninfo *var = &info->var;
	struct fb_fix_screeninfo *fix = &info->fix;
	u8 panel, display;
	u16 offset;
	u32 xres, yres;
	u32 xres_virtual, yres_virtual;
	int bpp, lcd_bpp;
	int is_color, is_dual, is_tft;
	int lcd_enabled, crt_enabled;

	fix->type = FB_TYPE_PACKED_PIXELS;

	display = epson1355_read_reg(par, REG_DISPLAY_MODE);
	bpp = epson1355_bpp_tab[(display >> 2) & 7];

	switch (bpp) {
	case 8:
		fix->visual = FB_VISUAL_PSEUDOCOLOR;
		var->bits_per_pixel = 8;
		var->red.offset = var->green.offset = var->blue.offset = 0;
		var->red.length = var->green.length = var->blue.length = 8;
		break;
	case 16:
		/* 5-6-5 RGB */
		fix->visual = FB_VISUAL_TRUECOLOR;
		var->bits_per_pixel = 16;
		var->red.offset = 11;
		var->red.length = 5;
		var->green.offset = 5;
		var->green.length = 6;
		var->blue.offset = 0;
		var->blue.length = 5;
		break;
	default:
		BUG();
	}
	fb_alloc_cmap(&(info->cmap), 256, 0);

	panel = epson1355_read_reg(par, REG_PANEL_TYPE);
	is_color = (panel & 0x04) != 0;
	is_dual = (panel & 0x02) != 0;
	is_tft = (panel & 0x01) != 0;
	crt_enabled = (display & 0x02) != 0;
	lcd_enabled = (display & 0x01) != 0;
	lcd_bpp = epson1355_width_tab[is_tft][(panel >> 4) & 3];

	xres = (epson1355_read_reg(par, REG_HORZ_DISP_WIDTH) + 1) * 8;
	yres = (epson1355_read_reg16(par, REG_VERT_DISP_HEIGHT0) + 1) *
	    ((is_dual && !crt_enabled) ? 2 : 1);
	offset = epson1355_read_reg16(par, REG_MEM_ADDR_OFFSET0) & 0x7ff;
	xres_virtual = offset * 16 / bpp;
	yres_virtual = fix->smem_len / (offset * 2);

	var->xres = xres;
	var->yres = yres;
	var->xres_virtual = xres_virtual;
	var->yres_virtual = yres_virtual;
	var->xoffset = var->yoffset = 0;

	fix->line_length = offset * 2;

	fix->xpanstep = 0;	/* no pan yet */
	fix->ypanstep = 1;
	fix->ywrapstep = 0;
	fix->accel = FB_ACCEL_NONE;

	var->grayscale = !is_color;

#ifdef DEBUG
	printk(KERN_INFO
	       "epson1355fb: xres=%d, yres=%d, "
	       "is_color=%d, is_dual=%d, is_tft=%d\n",
	       xres, yres, is_color, is_dual, is_tft);
	printk(KERN_INFO
	       "epson1355fb: bpp=%d, lcd_bpp=%d, "
	       "crt_enabled=%d, lcd_enabled=%d\n",
	       bpp, lcd_bpp, crt_enabled, lcd_enabled);
#endif
}


static void clearfb16(struct fb_info *info)
{
	u16 *dst = (u16 *) info->screen_base;
	unsigned long n = info->fix.smem_len;

	while (n > 1) {
		fb_writew(0, dst);
		dst++, n -= 2;
	}

	if (n)
		fb_writeb(0, dst);
}

static int epson1355fb_remove(struct platform_device *dev)
{
	struct fb_info *info = platform_get_drvdata(dev);
	struct epson1355_par *par = info->par;

	backlight_enable(0);
	if (par) {
		lcd_enable(par, 0);
		if (par && par->reg_addr)
			iounmap((void *) par->reg_addr);
	}

	if (info) {
		fb_dealloc_cmap(&info->cmap);
		if (info->screen_base)
			iounmap(info->screen_base);
		framebuffer_release(info);
	}
	release_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
	release_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
	return 0;
}

int __init epson1355fb_probe(struct platform_device *dev)
{
	struct epson1355_par *default_par;
	struct fb_info *info;
	u8 revision;
	int rc = 0;

	if (!request_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN, "S1D13505 registers")) {
		printk(KERN_ERR "epson1355fb: unable to reserve "
		       "registers at 0x%0x\n", EPSON1355FB_REGS_PHYS);
		rc = -EBUSY;
		goto bail;
	}

	if (!request_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN,
				"S1D13505 framebuffer")) {
		printk(KERN_ERR "epson1355fb: unable to reserve "
		       "framebuffer at 0x%0x\n", EPSON1355FB_FB_PHYS);
		rc = -EBUSY;
		goto bail;
	}

	info = framebuffer_alloc(sizeof(struct epson1355_par) + sizeof(u32) * 256, &dev->dev);
	if (!info) {
		rc = -ENOMEM;
		goto bail;
	}

	default_par = info->par;
	default_par->reg_addr = (unsigned long) ioremap(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
	if (!default_par->reg_addr) {
		printk(KERN_ERR "epson1355fb: unable to map registers\n");
		rc = -ENOMEM;
		goto bail;
	}
	info->pseudo_palette = (void *)(default_par + 1);

	info->screen_base = ioremap(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
	if (!info->screen_base) {
		printk(KERN_ERR "epson1355fb: unable to map framebuffer\n");
		rc = -ENOMEM;
		goto bail;
	}

	revision = epson1355_read_reg(default_par, REG_REVISION_CODE);
	if ((revision >> 2) != 3) {
		printk(KERN_INFO "epson1355fb: epson1355 not found\n");
		rc = -ENODEV;
		goto bail;
	}

	info->fix.mmio_start = EPSON1355FB_REGS_PHYS;
	info->fix.mmio_len = EPSON1355FB_REGS_LEN;
	info->fix.smem_start = EPSON1355FB_FB_PHYS;
	info->fix.smem_len = get_fb_size(info);

	printk(KERN_INFO "epson1355fb: regs mapped at 0x%lx, fb %d KiB mapped at 0x%p\n",
	       default_par->reg_addr, info->fix.smem_len / 1024, info->screen_base);

	strcpy(info->fix.id, "S1D13505");
	info->par = default_par;
	info->fbops = &epson1355fb_fbops;
	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;

	/* we expect the boot loader to have initialized the chip
	   with appropriate parameters from which we can determinte
	   the flavor of lcd panel attached */
	fetch_hw_state(info, default_par);

	/* turn this puppy on ... */
	clearfb16(info);
	backlight_enable(1);
	lcd_enable(default_par, 1);

	if (register_framebuffer(info) < 0) {
		rc = -EINVAL;
		goto bail;
	}
	/*
	 * Our driver data.
	 */
	platform_set_drvdata(dev, info);

	printk(KERN_INFO "fb%d: %s frame buffer device\n",
	       info->node, info->fix.id);

	return 0;

      bail:
	epson1355fb_remove(dev);
	return rc;
}

static struct platform_driver epson1355fb_driver = {
	.probe	= epson1355fb_probe,
	.remove	= epson1355fb_remove,
	.driver	= {
		.name	= "epson1355fb",
	},
};

static struct platform_device *epson1355fb_device;

int __init epson1355fb_init(void)
{
	int ret = 0;

	if (fb_get_options("epson1355fb", NULL))
		return -ENODEV;

	ret = platform_driver_register(&epson1355fb_driver);

	if (!ret) {
		epson1355fb_device = platform_device_alloc("epson1355fb", 0);

		if (epson1355fb_device)
			ret = platform_device_add(epson1355fb_device);
		else
			ret = -ENOMEM;

		if (ret) {
			platform_device_put(epson1355fb_device);
			platform_driver_unregister(&epson1355fb_driver);
		}
	}

	return ret;
}

module_init(epson1355fb_init);
	
#ifdef MODULE
static void __exit epson1355fb_exit(void)
{
	platform_device_unregister(epson1355fb_device);
	platform_driver_unregister(&epson1355fb_driver);
}

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

module_exit(epson1355fb_exit);
#endif

MODULE_AUTHOR("Christopher Hoover <ch@hpl.hp.com>");
MODULE_DESCRIPTION("Framebuffer driver for Epson S1D13505");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/video/epson1355fb.c -- Epson S1D13505 frame buffer for 2.5.
	3	*
	4	* Epson Research S1D13505 Embedded RAMDAC LCD/CRT Controller
	5	* (previously known as SED1355)
	6	*
	7	* Cf. http://www.erd.epson.com/vdc/html/S1D13505.html
	8	*
	9	*
	10	* Copyright (C) Hewlett-Packard Company. All rights reserved.
	11	*
	12	* Written by Christopher Hoover <ch@hpl.hp.com>
	13	*
	14	* Adapted from:
	15	*
	16	* linux/drivers/video/skeletonfb.c
	17	* Modified to new api Jan 2001 by James Simmons (jsimmons@infradead.org)
	18	* Created 28 Dec 1997 by Geert Uytterhoeven
	19	*
	20	* linux/drivers/video/epson1355fb.c (2.4 driver)
	21	* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
	22	*
	23	* This file is subject to the terms and conditions of the GNU General Public
	24	* License. See the file COPYING in the main directory of this archive for
	25	* more details.
	26	*
	27	*
	28	* Noteworthy Issues
	29	* -----------------
	30	*
	31	* This driver is complicated by the fact that this is a 16-bit chip
	32	* and, on at least one platform (ceiva), we can only do 16-bit reads
	33	* and writes to the framebuffer. We hide this from user space
	34	* except in the case of mmap().
	35	*
	36	*
	37	* To Do
	38	* -----
	39	*
	40	* - Test 8-bit pseudocolor mode
	41	* - Allow setting bpp, virtual resolution
	42	* - Implement horizontal panning
	43	* - (maybe) Implement hardware cursor
	44	*/
	45
	46	#include <linux/module.h>
	47	#include <linux/kernel.h>
	48	#include <linux/errno.h>
	49	#include <linux/string.h>
	50	#include <linux/mm.h>
1da177e4 LT	51	#include <linux/slab.h>
	52	#include <linux/delay.h>
	53	#include <linux/fb.h>
	54	#include <linux/init.h>
	55	#include <linux/ioport.h>
d052d1be RK	56	#include <linux/platform_device.h>
d052d1be RK	57
1da177e4 LT	58	#include <asm/types.h>
	59	#include <asm/io.h>
	60	#include <asm/uaccess.h>
	61
	62	#include <video/epson1355.h>
	63
	64	struct epson1355_par {
	65	unsigned long reg_addr;
	66	};
	67
	68	/* ------------------------------------------------------------------------- */
	69
	70	#ifdef CONFIG_SUPERH
	71
	72	static inline u8 epson1355_read_reg(int index)
	73	{
	74	return ctrl_inb(par.reg_addr + index);
	75	}
	76
	77	static inline void epson1355_write_reg(u8 data, int index)
	78	{
	79	ctrl_outb(data, par.reg_addr + index);
	80	}
	81
	82	#elif defined(CONFIG_ARM)
	83
	84	# ifdef CONFIG_ARCH_CEIVA
	85	# include <asm/arch/hardware.h>
	86	# define EPSON1355FB_BASE_PHYS (CEIVA_PHYS_SED1355)
	87	# endif
	88
	89	static inline u8 epson1355_read_reg(struct epson1355_par *par, int index)
	90	{
	91	return __raw_readb(par->reg_addr + index);
	92	}
	93
	94	static inline void epson1355_write_reg(struct epson1355_par *par, u8 data, int index)
	95	{
	96	__raw_writeb(data, par->reg_addr + index);
	97	}
	98
	99	#else
	100	# error "no architecture-specific epson1355_{read,write}_reg"
	101	#endif
	102
	103	#ifndef EPSON1355FB_BASE_PHYS
	104	# error "EPSON1355FB_BASE_PHYS is not defined"
	105	#endif
	106
	107	#define EPSON1355FB_REGS_OFS (0)
	108	#define EPSON1355FB_REGS_PHYS (EPSON1355FB_BASE_PHYS + EPSON1355FB_REGS_OFS)
	109	#define EPSON1355FB_REGS_LEN (64)
	110
	111	#define EPSON1355FB_FB_OFS (0x00200000)
	112	#define EPSON1355FB_FB_PHYS (EPSON1355FB_BASE_PHYS + EPSON1355FB_FB_OFS)
	113	#define EPSON1355FB_FB_LEN (2 * 1024 * 1024)
	114
	115	/* ------------------------------------------------------------------------- */
	116
	117	static inline u16 epson1355_read_reg16(struct epson1355_par *par, int index)
	118	{
	119	u8 lo = epson1355_read_reg(par, index);
	120	u8 hi = epson1355_read_reg(par, index + 1);
	121
122	return (hi << 8) \| lo;
123	}
124
125	static inline void epson1355_write_reg16(struct epson1355_par *par, u16 data, int index)
126	{
127	u8 lo = data & 0xff;
128	u8 hi = (data >> 8) & 0xff;
129
130	epson1355_write_reg(par, lo, index);
131	epson1355_write_reg(par, hi, index + 1);
132	}
133
134	static inline u32 epson1355_read_reg20(struct epson1355_par *par, int index)
135	{
136	u8 b0 = epson1355_read_reg(par, index);
137	u8 b1 = epson1355_read_reg(par, index + 1);
138	u8 b2 = epson1355_read_reg(par, index + 2);
139
140	return (b2 & 0x0f) << 16 \| (b1 << 8) \| b0;
141	}
142
143	static inline void epson1355_write_reg20(struct epson1355_par *par, u32 data, int index)
144	{
145	u8 b0 = data & 0xff;
146	u8 b1 = (data >> 8) & 0xff;
147	u8 b2 = (data >> 16) & 0x0f;
148
149	epson1355_write_reg(par, b0, index);
150	epson1355_write_reg(par, b1, index + 1);
151	epson1355_write_reg(par, b2, index + 2);
152	}
153
154	/* ------------------------------------------------------------------------- */
155
156	static void set_lut(struct epson1355_par *par, u8 index, u8 r, u8 g, u8 b)
157	{
158	epson1355_write_reg(par, index, REG_LUT_ADDR);
159	epson1355_write_reg(par, r, REG_LUT_DATA);
160	epson1355_write_reg(par, g, REG_LUT_DATA);
161	epson1355_write_reg(par, b, REG_LUT_DATA);
162	}
163
164
165	/**
166	* epson1355fb_setcolreg - sets a color register.
167	* @regno: Which register in the CLUT we are programming
168	* @red: The red value which can be up to 16 bits wide
169	* @green: The green value which can be up to 16 bits wide
170	* @blue: The blue value which can be up to 16 bits wide.
171	* @transp: If supported the alpha value which can be up to 16 bits wide.
172	* @info: frame buffer info structure
173	*
174	* Returns negative errno on error, or zero on success.
175	*/
176	static int epson1355fb_setcolreg(unsigned regno, unsigned r, unsigned g,
177	unsigned b, unsigned transp,
178	struct fb_info *info)
179	{
180	struct epson1355_par *par = info->par;
181
182	if (info->var.grayscale)
183	r = g = b = (19595 * r + 38470 * g + 7471 * b) >> 16;
184
185	switch (info->fix.visual) {
186	case FB_VISUAL_TRUECOLOR:
187	if (regno >= 16)
188	return -EINVAL;
189
190	((u32 *) info->pseudo_palette)[regno] =
191	(r & 0xf800) \| (g & 0xfc00) >> 5 \| (b & 0xf800) >> 11;
192
193	break;
194	case FB_VISUAL_PSEUDOCOLOR:
195	if (regno >= 256)
196	return -EINVAL;
197
198	set_lut(par, regno, r >> 8, g >> 8, b >> 8);
199
200	break;
201	default:
202	return -ENOSYS;
203	}
204	return 0;
205	}
206
207	/* ------------------------------------------------------------------------- */
208
209	/**
210	* epson1355fb_pan_display - Pans the display.
211	* @var: frame buffer variable screen structure
212	* @info: frame buffer structure that represents a single frame buffer
213	*
214	* Pan (or wrap, depending on the `vmode' field) the display using the
215	* `xoffset' and `yoffset' fields of the `var' structure.
216	* If the values don't fit, return -EINVAL.
217	*
218	* Returns negative errno on error, or zero on success.
219	*/
220	static int epson1355fb_pan_display(struct fb_var_screeninfo *var,
221	struct fb_info *info)
222	{
223	struct epson1355_par *par = info->par;
224	u32 start;
225
226	if (var->xoffset != 0) /* not yet ... */
227	return -EINVAL;
228
229	if (var->yoffset + info->var.yres > info->var.yres_virtual)
230	return -EINVAL;
231
232	start = (info->fix.line_length >> 1) * var->yoffset;
233
234	epson1355_write_reg20(par, start, REG_SCRN1_DISP_START_ADDR0);
235
236	return 0;
237	}
238
239	/* ------------------------------------------------------------------------- */
240
241	static void lcd_enable(struct epson1355_par *par, int enable)
242	{
243	u8 mode = epson1355_read_reg(par, REG_DISPLAY_MODE);
244
245	if (enable)
246	mode \|= 1;
247	else
248	mode &= ~1;
249
250	epson1355_write_reg(par, mode, REG_DISPLAY_MODE);
251	}
252
253	#if defined(CONFIG_ARCH_CEIVA)
254	static void backlight_enable(int enable)
255	{
256	/* ### this should be protected by a spinlock ... */
257	u8 pddr = clps_readb(PDDR);
258	if (enable)
259	pddr \|= (1 << 5);
260	else
261	pddr &= ~(1 << 5);
262	clps_writeb(pddr, PDDR);
263	}
264	#else
265	static void backlight_enable(int enable)
266	{
267	}
268	#endif
269
270
271	/**
272	* epson1355fb_blank - blanks the display.
273	* @blank_mode: the blank mode we want.
274	* @info: frame buffer structure that represents a single frame buffer
275	*
276	* Blank the screen if blank_mode != 0, else unblank. Return 0 if
277	* blanking succeeded, != 0 if un-/blanking failed due to e.g. a
278	* video mode which doesn't support it. Implements VESA suspend
279	* and powerdown modes on hardware that supports disabling hsync/vsync:
280	* blank_mode == 2: suspend vsync
281	* blank_mode == 3: suspend hsync
282	* blank_mode == 4: powerdown
283	*
284	* Returns negative errno on error, or zero on success.
285	*
286	*/
287	static int epson1355fb_blank(int blank_mode, struct fb_info *info)
288	{
289	struct epson1355_par *par = info->par;
290
291	switch (blank_mode) {
292	case FB_BLANK_UNBLANKING:
293	case FB_BLANK_NORMAL:
294	lcd_enable(par, 1);
295	backlight_enable(1);
296	break;
297	case FB_BLANK_VSYNC_SUSPEND:
298	case FB_BLANK_HSYNC_SUSPEND:
299	backlight_enable(0);
300	break;
301	case FB_BLANK_POWERDOWN:
302	backlight_enable(0);
303	lcd_enable(par, 0);
304	break;
305	default:
306	return -EINVAL;
307	}
308
309	/* let fbcon do a soft blank for us */
310	return (blank_mode == FB_BLANK_NORMAL) ? 1 : 0;
311	}
312
313	/* ------------------------------------------------------------------------- */
314
315	/*
316	* We can't use the cfb generic routines, as we have to limit
317	* ourselves to 16-bit or 8-bit loads and stores to this 16-bit
318	* chip.
319	*/
320
321	static inline void epson1355fb_fb_writel(unsigned long v, unsigned long *a)
322	{
323	u16 p = (u16 ) a;
324	u16 l = v & 0xffff;
325	u16 h = v >> 16;
326
327	fb_writew(l, p);
328	fb_writew(h, p + 1);
329	}
330
331	static inline unsigned long epson1355fb_fb_readl(const unsigned long *a)
332	{
333	const u16 p = (u16 ) a;
334	u16 l = fb_readw(p);
335	u16 h = fb_readw(p + 1);
336
337	return (h << 16) \| l;
338	}
339
340	#define FB_READL epson1355fb_fb_readl
341	#define FB_WRITEL epson1355fb_fb_writel
342
343	/* ------------------------------------------------------------------------- */
344
345	static inline unsigned long copy_from_user16(void to, const void from,
346	unsigned long n)
347	{
348	u16 dst = (u16 ) to;
349	u16 src = (u16 ) from;
350
351	if (!access_ok(VERIFY_READ, from, n))
352	return n;
353
354	while (n > 1) {
355	u16 v;
356	if (__get_user(v, src))
357	return n;
358
359	fb_writew(v, dst);
360
361	src++, dst++;
362	n -= 2;
363	}
364
365	if (n) {
366	u8 v;
367
368	if (__get_user(v, ((u8 *) src)))
369	return n;
370
371	fb_writeb(v, dst);
372	}
373	return 0;
374	}
375
376	static inline unsigned long copy_to_user16(void to, const void from,
377	unsigned long n)
378	{
379	u16 dst = (u16 ) to;
380	u16 src = (u16 ) from;
381
382	if (!access_ok(VERIFY_WRITE, to, n))
383	return n;
384
385	while (n > 1) {
386	u16 v = fb_readw(src);
387
388	if (__put_user(v, dst))
389	return n;
390
391	src++, dst++;
392	n -= 2;
393	}
394
395	if (n) {
396	u8 v = fb_readb(src);
397
398	if (__put_user(v, ((u8 *) dst)))
399	return n;
400	}
401	return 0;
402	}
403
404
405	static ssize_t
3f9b0880	406	epson1355fb_read(struct fb_info info, char buf, size_t count, loff_t * ppos)
1da177e4	407	{
1da177e4 LT	408	unsigned long p = *ppos;
1da177e4 LT	409
1da177e4 LT	410	if (p >= info->fix.smem_len)
	411	return 0;
	412	if (count >= info->fix.smem_len)
	413	count = info->fix.smem_len;
	414	if (count + p > info->fix.smem_len)
	415	count = info->fix.smem_len - p;
	416
	417	if (count) {
	418	char *base_addr;
	419
	420	base_addr = info->screen_base;
	421	count -= copy_to_user16(buf, base_addr + p, count);
	422	if (!count)
	423	return -EFAULT;
	424	*ppos += count;
	425	}
	426	return count;
	427	}
	428
	429	static ssize_t
3f9b0880	430	epson1355fb_write(struct fb_info info, const char buf,
1da177e4 LT	431	size_t count, loff_t * ppos)
1da177e4 LT	432	{
1da177e4 LT	433	unsigned long p = *ppos;
	434	int err;
	435
1da177e4 LT	436	/* from fbmem.c except for our own copy__user /
	437	if (p > info->fix.smem_len)
	438	return -ENOSPC;
	439	if (count >= info->fix.smem_len)
	440	count = info->fix.smem_len;
	441	err = 0;
	442	if (count + p > info->fix.smem_len) {
	443	count = info->fix.smem_len - p;
	444	err = -ENOSPC;
	445	}
	446
	447	if (count) {
	448	char *base_addr;
	449
	450	base_addr = info->screen_base;
	451	count -= copy_from_user16(base_addr + p, buf, count);
	452	*ppos += count;
	453	err = -EFAULT;
	454	}
	455	if (count)
	456	return count;
	457	return err;
	458	}
	459
	460	/* ------------------------------------------------------------------------- */
	461
	462	static struct fb_ops epson1355fb_fbops = {
	463	.owner = THIS_MODULE,
	464	.fb_setcolreg = epson1355fb_setcolreg,
	465	.fb_pan_display = epson1355fb_pan_display,
	466	.fb_blank = epson1355fb_blank,
	467	.fb_fillrect = cfb_fillrect,
	468	.fb_copyarea = cfb_copyarea,
	469	.fb_imageblit = cfb_imageblit,
	470	.fb_read = epson1355fb_read,
	471	.fb_write = epson1355fb_write,
1da177e4 LT	472	};
	473
	474	/* ------------------------------------------------------------------------- */
	475
	476	static __init unsigned int get_fb_size(struct fb_info *info)
	477	{
	478	unsigned int size = 2 * 1024 * 1024;
	479	char *p = info->screen_base;
	480
	481	/* the 512k framebuffer is aliased at start + 0x80000 * n */
	482	fb_writeb(1, p);
	483	fb_writeb(0, p + 0x80000);
	484	if (!fb_readb(p))
	485	size = 512 * 1024;
	486
	487	fb_writeb(0, p);
	488
	489	return size;
	490	}
	491
	492	static int epson1355_width_tab[2][4] __initdata =
	493	{ {4, 8, 16, -1}, {9, 12, 16, -1} };
	494	static int epson1355_bpp_tab[8] __initdata = { 1, 2, 4, 8, 15, 16 };
	495
	496	static void __init fetch_hw_state(struct fb_info info, struct epson1355_par par)
	497	{
	498	struct fb_var_screeninfo *var = &info->var;
	499	struct fb_fix_screeninfo *fix = &info->fix;
	500	u8 panel, display;
	501	u16 offset;
	502	u32 xres, yres;
	503	u32 xres_virtual, yres_virtual;
	504	int bpp, lcd_bpp;
	505	int is_color, is_dual, is_tft;
	506	int lcd_enabled, crt_enabled;
	507
	508	fix->type = FB_TYPE_PACKED_PIXELS;
	509
	510	display = epson1355_read_reg(par, REG_DISPLAY_MODE);
	511	bpp = epson1355_bpp_tab[(display >> 2) & 7];
	512
	513	switch (bpp) {
	514	case 8:
	515	fix->visual = FB_VISUAL_PSEUDOCOLOR;
	516	var->bits_per_pixel = 8;
	517	var->red.offset = var->green.offset = var->blue.offset = 0;
	518	var->red.length = var->green.length = var->blue.length = 8;
	519	break;
	520	case 16:
	521	/* 5-6-5 RGB */
	522	fix->visual = FB_VISUAL_TRUECOLOR;
	523	var->bits_per_pixel = 16;
	524	var->red.offset = 11;
	525	var->red.length = 5;
	526	var->green.offset = 5;
	527	var->green.length = 6;
	528	var->blue.offset = 0;
	529	var->blue.length = 5;
	530	break;
	531	default:
	532	BUG();
	533	}
	534	fb_alloc_cmap(&(info->cmap), 256, 0);
	535
536	panel = epson1355_read_reg(par, REG_PANEL_TYPE);
537	is_color = (panel & 0x04) != 0;
538	is_dual = (panel & 0x02) != 0;
539	is_tft = (panel & 0x01) != 0;
540	crt_enabled = (display & 0x02) != 0;
541	lcd_enabled = (display & 0x01) != 0;
542	lcd_bpp = epson1355_width_tab[is_tft][(panel >> 4) & 3];
543
544	xres = (epson1355_read_reg(par, REG_HORZ_DISP_WIDTH) + 1) * 8;
545	yres = (epson1355_read_reg16(par, REG_VERT_DISP_HEIGHT0) + 1) *
546	((is_dual && !crt_enabled) ? 2 : 1);
547	offset = epson1355_read_reg16(par, REG_MEM_ADDR_OFFSET0) & 0x7ff;
548	xres_virtual = offset * 16 / bpp;
549	yres_virtual = fix->smem_len / (offset * 2);
550
551	var->xres = xres;
552	var->yres = yres;
553	var->xres_virtual = xres_virtual;
554	var->yres_virtual = yres_virtual;
555	var->xoffset = var->yoffset = 0;
556
557	fix->line_length = offset * 2;
558
559	fix->xpanstep = 0; /* no pan yet */
560	fix->ypanstep = 1;
561	fix->ywrapstep = 0;
562	fix->accel = FB_ACCEL_NONE;
563
564	var->grayscale = !is_color;
565
566	#ifdef DEBUG
567	printk(KERN_INFO
568	"epson1355fb: xres=%d, yres=%d, "
569	"is_color=%d, is_dual=%d, is_tft=%d\n",
570	xres, yres, is_color, is_dual, is_tft);
571	printk(KERN_INFO
572	"epson1355fb: bpp=%d, lcd_bpp=%d, "
573	"crt_enabled=%d, lcd_enabled=%d\n",
574	bpp, lcd_bpp, crt_enabled, lcd_enabled);
575	#endif
576	}
577
578
579	static void clearfb16(struct fb_info *info)
580	{
581	u16 dst = (u16 ) info->screen_base;
582	unsigned long n = info->fix.smem_len;
583
584	while (n > 1) {
585	fb_writew(0, dst);
586	dst++, n -= 2;
587	}
588
589	if (n)
590	fb_writeb(0, dst);
591	}
592
3ae5eaec	593	static int epson1355fb_remove(struct platform_device *dev)
1da177e4	594	{
3ae5eaec	595	struct fb_info *info = platform_get_drvdata(dev);
1da177e4 LT	596	struct epson1355_par *par = info->par;
	597
	598	backlight_enable(0);
	599	if (par) {
	600	lcd_enable(par, 0);
	601	if (par && par->reg_addr)
	602	iounmap((void *) par->reg_addr);
	603	}
	604
	605	if (info) {
	606	fb_dealloc_cmap(&info->cmap);
	607	if (info->screen_base)
	608	iounmap(info->screen_base);
	609	framebuffer_release(info);
	610	}
	611	release_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
	612	release_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
	613	return 0;
	614	}
	615
3ae5eaec	616	int __init epson1355fb_probe(struct platform_device *dev)
1da177e4	617	{
1da177e4 LT	618	struct epson1355_par *default_par;
	619	struct fb_info *info;
	620	u8 revision;
	621	int rc = 0;
	622
	623	if (!request_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN, "S1D13505 registers")) {
	624	printk(KERN_ERR "epson1355fb: unable to reserve "
	625	"registers at 0x%0x\n", EPSON1355FB_REGS_PHYS);
	626	rc = -EBUSY;
	627	goto bail;
	628	}
	629
	630	if (!request_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN,
	631	"S1D13505 framebuffer")) {
	632	printk(KERN_ERR "epson1355fb: unable to reserve "
	633	"framebuffer at 0x%0x\n", EPSON1355FB_FB_PHYS);
	634	rc = -EBUSY;
	635	goto bail;
	636	}
	637
	638	info = framebuffer_alloc(sizeof(struct epson1355_par) + sizeof(u32) * 256, &dev->dev);
19f3d3a5	639	if (!info) {
1da177e4 LT	640	rc = -ENOMEM;
1da177e4 LT	641	goto bail;
19f3d3a5	642	}
1da177e4 LT	643
	644	default_par = info->par;
	645	default_par->reg_addr = (unsigned long) ioremap(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
	646	if (!default_par->reg_addr) {
	647	printk(KERN_ERR "epson1355fb: unable to map registers\n");
	648	rc = -ENOMEM;
	649	goto bail;
	650	}
	651	info->pseudo_palette = (void *)(default_par + 1);
	652
	653	info->screen_base = ioremap(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
	654	if (!info->screen_base) {
	655	printk(KERN_ERR "epson1355fb: unable to map framebuffer\n");
	656	rc = -ENOMEM;
	657	goto bail;
	658	}
	659
	660	revision = epson1355_read_reg(default_par, REG_REVISION_CODE);
	661	if ((revision >> 2) != 3) {
	662	printk(KERN_INFO "epson1355fb: epson1355 not found\n");
	663	rc = -ENODEV;
	664	goto bail;
	665	}
	666
	667	info->fix.mmio_start = EPSON1355FB_REGS_PHYS;
	668	info->fix.mmio_len = EPSON1355FB_REGS_LEN;
	669	info->fix.smem_start = EPSON1355FB_FB_PHYS;
	670	info->fix.smem_len = get_fb_size(info);
	671
	672	printk(KERN_INFO "epson1355fb: regs mapped at 0x%lx, fb %d KiB mapped at 0x%p\n",
	673	default_par->reg_addr, info->fix.smem_len / 1024, info->screen_base);
	674
	675	strcpy(info->fix.id, "S1D13505");
	676	info->par = default_par;
	677	info->fbops = &epson1355fb_fbops;
	678	info->flags = FBINFO_DEFAULT \| FBINFO_HWACCEL_YPAN;
	679
	680	/* we expect the boot loader to have initialized the chip
	681	with appropriate parameters from which we can determinte
	682	the flavor of lcd panel attached */
	683	fetch_hw_state(info, default_par);
	684
	685	/* turn this puppy on ... */
	686	clearfb16(info);
	687	backlight_enable(1);
	688	lcd_enable(default_par, 1);
	689
	690	if (register_framebuffer(info) < 0) {
	691	rc = -EINVAL;
	692	goto bail;
	693	}
	694	/*
	695	* Our driver data.
	696	*/
3ae5eaec	697	platform_set_drvdata(dev, info);
1da177e4 LT	698
	699	printk(KERN_INFO "fb%d: %s frame buffer device\n",
	700	info->node, info->fix.id);
	701
	702	return 0;
	703
	704	bail:
3ae5eaec	705	epson1355fb_remove(dev);
1da177e4 LT	706	return rc;
	707	}
	708
3ae5eaec	709	static struct platform_driver epson1355fb_driver = {
1da177e4 LT	710	.probe = epson1355fb_probe,
1da177e4 LT	711	.remove = epson1355fb_remove,
3ae5eaec RK	712	.driver = {
	713	.name = "epson1355fb",
	714	},
1da177e4 LT	715	};
1da177e4 LT	716
673681c1	717	static struct platform_device *epson1355fb_device;
1da177e4 LT	718
	719	int __init epson1355fb_init(void)
	720	{
	721	int ret = 0;
	722
	723	if (fb_get_options("epson1355fb", NULL))
	724	return -ENODEV;
	725
3ae5eaec	726	ret = platform_driver_register(&epson1355fb_driver);
673681c1	727
1da177e4	728	if (!ret) {
673681c1 AD	729	epson1355fb_device = platform_device_alloc("epson1355fb", 0);
	730
	731	if (epson1355fb_device)
	732	ret = platform_device_add(epson1355fb_device);
	733	else
	734	ret = -ENOMEM;
	735
	736	if (ret) {
	737	platform_device_put(epson1355fb_device);
3ae5eaec	738	platform_driver_unregister(&epson1355fb_driver);
673681c1	739	}
1da177e4	740	}
673681c1	741
1da177e4 LT	742	return ret;
	743	}
	744
	745	module_init(epson1355fb_init);
	746
	747	#ifdef MODULE
	748	static void __exit epson1355fb_exit(void)
	749	{
673681c1	750	platform_device_unregister(epson1355fb_device);
3ae5eaec	751	platform_driver_unregister(&epson1355fb_driver);
1da177e4 LT	752	}
	753
	754	/* ------------------------------------------------------------------------- */
	755
	756	module_exit(epson1355fb_exit);
	757	#endif
	758
	759	MODULE_AUTHOR("Christopher Hoover <ch@hpl.hp.com>");
	760	MODULE_DESCRIPTION("Framebuffer driver for Epson S1D13505");
	761	MODULE_LICENSE("GPL");