X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fvideo%2Fepson1355fb.c;h=6cb54f809cd396d4f0bb158d6701fb430f7fc7b7;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=a998ee9d8d68e7299126e96da2663c69941f6be8;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git

diff --git a/drivers/video/epson1355fb.c b/drivers/video/epson1355fb.c
index a998ee9d8..6cb54f809 100644
--- a/drivers/video/epson1355fb.c
+++ b/drivers/video/epson1355fb.c
@@ -1,541 +1,771 @@
 /*
- * linux/drivers/video/epson1355fb.c
- *	-- Support for the Epson SED1355 LCD/CRT controller
+ * linux/drivers/video/epson1355fb.c -- Epson S1D13505 frame buffer for 2.5.
  *
- * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
+ * Epson Research S1D13505 Embedded RAMDAC LCD/CRT Controller
+ *   (previously known as SED1355)
  *
- * based on linux/drivers/video/skeletonfb.c, which was
+ * 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.
- */
-/* TODO (roughly in order of priority):
- * 16 bpp support
- * crt support
- * hw cursor support
- * SwivelView
+ * 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 <asm/io.h>
-#include <linux/config.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/fb.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
 #include <linux/module.h>
-#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
 #include <linux/string.h>
+#include <linux/mm.h>
 #include <linux/tty.h>
-#include <video/fbcon-cfb8.h>
-#include <video/fbcon-mfb.h>
-#include <video/fbcon.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <asm/types.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
 
-/* Register defines.  The docs don't seem to provide nice mnemonic names
- * so I made them up myself ... */
+#include <video/epson1355.h>
 
-#define E1355_PANEL	0x02
-#define E1355_DISPLAY	0x0D
-#define E1355_MISC	0x1B
-#define E1355_GPIO	0x20
-#define E1355_LUT_INDEX 0x24
-#define E1355_LUT_DATA	0x26
+struct epson1355_par {
+	unsigned long reg_addr;
+};
+
+/* ------------------------------------------------------------------------- */
 
 #ifdef CONFIG_SUPERH
-#define E1355_REG_BASE	CONFIG_E1355_REG_BASE
-#define E1355_FB_BASE	CONFIG_E1355_FB_BASE
 
-static inline u8 e1355_read_reg(int index)
+static inline u8 epson1355_read_reg(int index)
 {
-	return ctrl_inb(E1355_REG_BASE + index);
+	return ctrl_inb(par.reg_addr + index);
 }
 
-static inline void e1355_write_reg(u8 data, int index)
+static inline void epson1355_write_reg(u8 data, int index)
 {
-	ctrl_outb(data, E1355_REG_BASE + index);
+	ctrl_outb(data, par.reg_addr + index);
 }
 
-static inline u16 e1355_read_reg16(int 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 e1355_read_reg(index) + (e1355_read_reg(index+1) << 8);
+	return __raw_readb(par->reg_addr + index);
 }
 
-static inline void e1355_write_reg16(u16 data, int index)
+static inline void epson1355_write_reg(struct epson1355_par *par, u8 data, int index)
 {
-	e1355_write_reg((data&0xff), index);
-	e1355_write_reg(((data>>8)&0xff), index + 1);
+	__raw_writeb(data, par->reg_addr + index);
 }
+
 #else
-#error unknown architecture
+# error "no architecture-specific epson1355_{read,write}_reg"
 #endif
 
-struct e1355fb_info {
-	struct fb_info_gen gen;
-};
-
-static int current_par_valid = 0;
-static struct display disp;
+#ifndef EPSON1355FB_BASE_PHYS
+# error  "EPSON1355FB_BASE_PHYS is not defined"
+#endif
 
-static struct fb_var_screeninfo default_var;
+#define EPSON1355FB_REGS_OFS	(0)
+#define EPSON1355FB_REGS_PHYS	(EPSON1355FB_BASE_PHYS + EPSON1355FB_REGS_OFS)
+#define EPSON1355FB_REGS_LEN	(64)
 
-int e1355fb_init(void);
-int e1355fb_setup(char*);
-static int e1355_encode_var(struct fb_var_screeninfo *var, const void *par,
-			    struct fb_info_gen *info);
-/* ------------------- chipset specific functions -------------------------- */
+#define EPSON1355FB_FB_OFS	(0x00200000)
+#define EPSON1355FB_FB_PHYS	(EPSON1355FB_BASE_PHYS + EPSON1355FB_FB_OFS)
+#define EPSON1355FB_FB_LEN	(2 * 1024 * 1024)
 
+/* ------------------------------------------------------------------------- */
 
-static void disable_hw_cursor(void)
+static inline u16 epson1355_read_reg16(struct epson1355_par *par, int index)
 {
-	u8 curs;
+	u8 lo = epson1355_read_reg(par, index);
+	u8 hi = epson1355_read_reg(par, index + 1);
 
-	curs = e1355_read_reg(0x27);
-	curs &= ~0xc0;
-	e1355_write_reg(curs, 0x27);
+	return (hi << 8) | lo;
 }
 
-static void e1355_detect(void)
+static inline void epson1355_write_reg16(struct epson1355_par *par, u16 data, int index)
 {
-	u8 rev;
+	u8 lo = data & 0xff;
+	u8 hi = (data >> 8) & 0xff;
 
-	e1355_write_reg(0x00, E1355_MISC);
+	epson1355_write_reg(par, lo, index);
+	epson1355_write_reg(par, hi, index + 1);
+}
 
-	rev = e1355_read_reg(0x00);
+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);
 
-	if ((rev & 0xfc) != 0x0c) {
-		printk(KERN_WARNING "Epson 1355 not detected\n");
-	}
+	return (b2 & 0x0f) << 16 | (b1 << 8) | b0;
+}
 
-	/* XXX */
-	disable_hw_cursor();
+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;
 
-	e1355_encode_var(&default_var, NULL, NULL);
+	epson1355_write_reg(par, b0, index);
+	epson1355_write_reg(par, b1, index + 1);
+	epson1355_write_reg(par, b2, index + 2);
 }
 
-struct e1355_par {
-	u32 xres;
-	u32 yres;
+/* ------------------------------------------------------------------------- */
 
-	int bpp;
-	int mem_bpp;
+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);
+}
 
-	u32 panel_xres;
-	u32 panel_yres;
-	
-	int panel_width;
-	int panel_ymul;
-};
 
-static int e1355_encode_fix(struct fb_fix_screeninfo *fix,
-			    const void *raw_par,
-			    struct fb_info_gen *info)
+/**
+ *  	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)
 {
-	const struct e1355_par *par = raw_par;
-	
-	memset(fix, 0, sizeof *fix);
-	
-	fix->type= FB_TYPE_PACKED_PIXELS;
-
-	if (!par)
-		BUG();
+	struct epson1355_par *par = info->par;
 
-	if (par->bpp == 1) {
-		fix->visual = FB_VISUAL_MONO10;
-	} else if (par->bpp <= 8) {
-		fix->visual = FB_VISUAL_PSEUDOCOLOR;
-	} else {
-		fix->visual = FB_VISUAL_TRUECOLOR;
-	}
+	if (info->var.grayscale)
+		r = g = b = (19595 * r + 38470 * g + 7471 * b) >> 16;
 
-	return 0;
-}
+	switch (info->fix.visual) {
+	case FB_VISUAL_TRUECOLOR:
+		if (regno >= 16)
+			return -EINVAL;
 
-static int e1355_set_bpp(struct e1355_par *par, int bpp)
-{
-	int code;
-	u8 disp;
-	u16 bytes_per_line;
-
-	switch(bpp) {
-	case 1:
-		code = 0; break;
-	case 2:
-		code = 1; break;
-	case 4:
-		code = 2; break;
-	case 8:
-		code = 3; break;
-	case 16:
-		code = 5; break;
-	default:
-		return -EINVAL; break;
-	}
+		((u32 *) info->pseudo_palette)[regno] =
+		    (r & 0xf800) | (g & 0xfc00) >> 5 | (b & 0xf800) >> 11;
 
-	disp = e1355_read_reg(E1355_DISPLAY);
-	disp &= ~0x1c;
-	disp |= code << 2;
-	e1355_write_reg(disp, E1355_DISPLAY);
-	
-	bytes_per_line = (par->xres * bpp) >> 3;
-	
-	e1355_write_reg16(bytes_per_line, 0x16);
+		break;
+	case FB_VISUAL_PSEUDOCOLOR:
+		if (regno >= 256)
+			return -EINVAL;
 
-	par->bpp = bpp;
+		set_lut(par, regno, r >> 8, g >> 8, b >> 8);
 
+		break;
+	default:
+		return -ENOSYS;
+	}
 	return 0;
 }
-		
-static int e1355_decode_var(const struct fb_var_screeninfo *var,
-			    void *raw_par,
-			    struct fb_info_gen *info)
+
+/* ------------------------------------------------------------------------- */
+
+/**
+ *      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 e1355_par *par = raw_par;
-	int ret;
+	struct epson1355_par *par = info->par;
+	u32 start;
 
-	if (!par)
-		BUG();
+	if (var->xoffset != 0)	/* not yet ... */
+		return -EINVAL;
 
-	/*
-	 * Don't allow setting any of these yet: xres and yres don't
-	 * make sense for LCD panels; xres_virtual and yres_virtual
-	 * should be supported fine by our hardware though.
-	 */
-	if (var->xres != par->xres ||
-	    var->yres != par->yres ||
-	    var->xres != var->xres_virtual ||
-	    var->yres != var->yres_virtual ||
-	    var->xoffset != 0 ||
-	    var->yoffset != 0)
+	if (var->yoffset + info->var.yres > info->var.yres_virtual)
 		return -EINVAL;
 
-	if(var->bits_per_pixel != par->bpp) {
-		ret = e1355_set_bpp(par, var->bits_per_pixel);
+	start = (info->fix.line_length >> 1) * var->yoffset;
+
+	epson1355_write_reg20(par, start, REG_SCRN1_DISP_START_ADDR0);
 
-		if (ret)
-			goto out_err;
-	}
-		
 	return 0;
+}
 
- out_err:
-	return ret;
+/* ------------------------------------------------------------------------- */
+
+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);
 }
 
-static void dump_panel_data(void)
+#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)
 {
-	u8 panel = e1355_read_reg(E1355_PANEL);
-	int width[2][4] = { { 4, 8, 16, -1 }, { 9, 12, 16, -1 } };
-
-	printk("%s %s %s panel, width %d bits\n",
-	       panel & 2 ? "dual" : "single",
-	       panel & 4 ? "color" : "mono",
-	       panel & 1 ? "TFT" : "passive",
-	       width[panel&1][(panel>>4)&3]);
-
-	printk("resolution %d x %d\n",
-	       (e1355_read_reg(0x04) + 1) * 8,
-	       ((e1355_read_reg16(0x08) + 1) * (1 + ((panel & 3) == 2))));
 }
+#endif
+
 
-static int e1355_bpp_to_var(int bpp, struct fb_var_screeninfo *var)
+/**
+ *      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)
 {
-	switch(bpp) {
-	case 1:
-	case 2:
-	case 4:
-	case 8:
-		var->bits_per_pixel = bpp;
-		var->red.offset = var->green.offset = var->blue.offset = 0;
-		var->red.length = var->green.length = var->blue.length = bpp;
+	struct epson1355_par *par = info->par;
+
+	switch (blank_mode) {
+	case VESA_NO_BLANKING:
+		lcd_enable(par, 1);
+		backlight_enable(1);
 		break;
-	case 16:
-		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;
+	case VESA_VSYNC_SUSPEND:
+	case VESA_HSYNC_SUSPEND:
+		backlight_enable(0);
+		break;
+	case VESA_POWERDOWN:
+		backlight_enable(0);
+		lcd_enable(par, 0);
 		break;
+	default:
+		return -EINVAL;
 	}
-
 	return 0;
 }
 
-static int e1355_encode_var(struct fb_var_screeninfo *var, const void *raw_par,
-			    struct fb_info_gen *info)
-{
-	u8 panel, display;
-	u32 xres, xres_virtual, yres;
-	static int width[2][4] = { { 4, 8, 16, -1 }, { 9, 12, 16, -1 } };
-	static int bpp_tab[8] = { 1, 2, 4, 8, 15, 16 };
-	int bpp, hw_bpp;
-	int is_color, is_dual, is_tft;
-	int lcd_enabled, crt_enabled;
+/* ------------------------------------------------------------------------- */
 
-	panel = e1355_read_reg(E1355_PANEL);
-	display = e1355_read_reg(E1355_DISPLAY);
+/*
+ * 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.
+ */
 
-	is_color = (panel & 0x04) != 0;
-	is_dual  = (panel & 0x02) != 0;
-	is_tft   = (panel & 0x01) != 0;
+static inline void epson1355fb_fb_writel(unsigned long v, unsigned long *a)
+{
+	u16 *p = (u16 *) a;
+	u16 l = v & 0xffff;
+	u16 h = v >> 16;
 
-	bpp = bpp_tab[(display>>2)&7]; 
-	e1355_bpp_to_var(bpp, var);
+	fb_writew(l, p);
+	fb_writew(h, p + 1);
+}
 
-	crt_enabled = (display & 0x02) != 0;
-	lcd_enabled = (display & 0x02) != 0;
+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);
 
-	hw_bpp = width[is_tft][(panel>>4)&3];
+	return (h << 16) | l;
+}
 
-	xres = e1355_read_reg(0x04) + 1;
-	yres = e1355_read_reg16(0x08) + 1;
-	
-	xres *= 8;
-	/* talk about weird hardware .. */
-	yres *= (is_dual && !crt_enabled) ? 2 : 1;
+#define FB_READL epson1355fb_fb_readl
+#define FB_WRITEL epson1355fb_fb_writel
 
-	xres_virtual = e1355_read_reg16(0x16);
-	/* it's in 2-byte words initially */
-	xres_virtual *= 16;
-	xres_virtual /= var->bits_per_pixel;
+/* ------------------------------------------------------------------------- */
 
-	var->xres = xres;
-	var->yres = yres;
-	var->xres_virtual = xres_virtual;
-	var->yres_virtual = yres;
+static inline unsigned long copy_from_user16(void *to, const void *from,
+					     unsigned long n)
+{
+	u16 *dst = (u16 *) to;
+	u16 *src = (u16 *) from;
 
-	var->xoffset = var->yoffset = 0;
+	if (!access_ok(VERIFY_READ, from, n))
+		return n;
 
-	var->grayscale = !is_color;
-	
-	return 0;
-}
+	while (n > 1) {
+		u16 v;
+		if (__get_user(v, src))
+			return n;
 
-#define is_dual(panel) (((panel)&3)==2)
+		fb_writew(v, dst);
 
-static void get_panel_data(struct e1355_par *par)
-{
-	u8 panel;
-	int width[2][4] = { { 4, 8, 16, -1 }, { 9, 12, 16, -1 } };
+		src++, dst++;
+		n -= 2;
+	}
 
-	panel = e1355_read_reg(E1355_PANEL);
+	if (n) {
+		u8 v;
 
-	par->panel_width = width[panel&1][(panel>>4)&3];
-	par->panel_xres = (e1355_read_reg(0x04) + 1) * 8;
-	par->panel_ymul = is_dual(panel) ? 2 : 1;
-	par->panel_yres = ((e1355_read_reg16(0x08) + 1)
-			   * par->panel_ymul);
+		if (__get_user(v, ((u8 *) src)))
+			return n;
+
+		fb_writeb(v, dst);
+	}
+	return 0;
 }
 
-static void e1355_get_par(void *raw_par, struct fb_info_gen *info)
+static inline unsigned long copy_to_user16(void *to, const void *from,
+					   unsigned long n)
 {
-	struct e1355_par *par = raw_par;
+	u16 *dst = (u16 *) to;
+	u16 *src = (u16 *) from;
 
-	get_panel_data(par);
-}
+	if (!access_ok(VERIFY_WRITE, to, n))
+		return n;
 
-static void e1355_set_par(const void *par, struct fb_info_gen *info)
-{
-}
+	while (n > 1) {
+		u16 v = fb_readw(src);
 
-static int e1355_getcolreg(unsigned regno, unsigned *red, unsigned *green,
-			   unsigned *blue, unsigned *transp,
-			   struct fb_info *info)
-{
-	u8 r, g, b;
+		if (__put_user(v, dst))
+			return n;
 
-	e1355_write_reg(regno, E1355_LUT_INDEX);
-	r = e1355_read_reg(E1355_LUT_DATA);
-	g = e1355_read_reg(E1355_LUT_DATA);
-	b = e1355_read_reg(E1355_LUT_DATA);
+		src++, dst++;
+		n -= 2;
+	}
 
-	*red = r << 8;
-	*green = g << 8;
-	*blue = b << 8;
+	if (n) {
+		u8 v = fb_readb(src);
 
+		if (__put_user(v, ((u8 *) dst)))
+			return n;
+	}
 	return 0;
 }
 
-static int e1355fb_setcolreg(unsigned regno, unsigned red, unsigned green,
-			     unsigned blue, unsigned transp,
-			     struct fb_info *info)
+
+static ssize_t
+epson1355fb_read(struct file *file, char *buf, size_t count, loff_t * ppos)
 {
-	u8 r = (red >> 8) & 0xf0;
-	u8 g = (green>>8) & 0xf0;
-	u8 b = (blue>> 8) & 0xf0;
-
-	e1355_write_reg(regno, E1355_LUT_INDEX);
-	e1355_write_reg(r, E1355_LUT_DATA);
-	e1355_write_reg(g, E1355_LUT_DATA);
-	e1355_write_reg(b, E1355_LUT_DATA);
-	
-	return 0;
+	struct inode *inode = file->f_dentry->d_inode;
+	int fbidx = iminor(inode);
+	struct fb_info *info = registered_fb[fbidx];
+	unsigned long p = *ppos;
+
+	/* from fbmem.c except for our own copy_*_user */
+	if (!info || !info->screen_base)
+		return -ENODEV;
+
+	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 int e1355_pan_display(const struct fb_var_screeninfo *var,
-			     struct fb_info_gen *info)
+static ssize_t
+epson1355fb_write(struct file *file, const char *buf,
+		  size_t count, loff_t * ppos)
 {
-	BUG();
-	
-	return -EINVAL;
-}
+	struct inode *inode = file->f_dentry->d_inode;
+	int fbidx = iminor(inode);
+	struct fb_info *info = registered_fb[fbidx];
+	unsigned long p = *ppos;
+	int err;
+
+	/* from fbmem.c except for our own copy_*_user */
+	if (!info || !info->screen_base)
+		return -ENODEV;
+
+	/* 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;
+	}
 
-/*
- * The AERO_HACKS parts disable/enable the backlight on the Compaq Aero 8000.
- * I'm not sure they aren't dangerous to the hardware, so be warned.
- */
-#undef AERO_HACKS
+	if (count) {
+		char *base_addr;
 
-static int e1355_blank(int blank_mode, struct fb_info_gen *info)
-{
-	u8 disp;
+		base_addr = info->screen_base;
+		count -= copy_from_user16(base_addr + p, buf, count);
+		*ppos += count;
+		err = -EFAULT;
+	}
+	if (count)
+		return count;
+	return err;
+}
 
-	switch (blank_mode) {
-	case VESA_NO_BLANKING:
-		disp = e1355_read_reg(E1355_DISPLAY);
-		disp |= 1;
-		e1355_write_reg(disp, E1355_DISPLAY);
- 		
-#ifdef AERO_HACKS
-		e1355_write_reg(0x6, 0x20);
-#endif
-		break;
+/* ------------------------------------------------------------------------- */
+
+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,
+	.fb_cursor 	= soft_cursor,
+};
 
-	case VESA_VSYNC_SUSPEND:
-	case VESA_HSYNC_SUSPEND:
-	case VESA_POWERDOWN:
-		disp = e1355_read_reg(E1355_DISPLAY);
-		disp &= ~1;
-		e1355_write_reg(disp, E1355_DISPLAY);
+/* ------------------------------------------------------------------------- */
 
-#ifdef AERO_HACKS
-		e1355_write_reg(0x0, 0x20);
-#endif
-		break;
+static __init unsigned int get_fb_size(struct fb_info *info)
+{
+	unsigned int size = 2 * 1024 * 1024;
+	char *p = info->screen_base;
 
-	default:
-		return -EINVAL;
-	}
+	/* 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;
 
-	return 0;
+	fb_writeb(0, p);
+
+	return size;
 }
 
-static struct display_switch e1355_dispsw;
+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 e1355_set_disp(const void *unused, struct display *disp,
-			   struct fb_info_gen *info)
+static void __init fetch_hw_state(struct fb_info *info, struct epson1355_par *par)
 {
-	struct display_switch *d;
+	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;
 
-	disp->dispsw = &e1355_dispsw;
-	
-	switch(disp->var.bits_per_pixel) {
-#ifdef FBCON_HAS_MFB
-	case 1:
-		d = &fbcon_mfb; break;
-#endif	       
-#ifdef FBCON_HAS_CFB8
+	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:
-		d = &fbcon_cfb8; break;
-#endif
+		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(); break;
+		BUG();
 	}
+	fb_alloc_cmap(&(info->cmap), 256, 0);
 
-	memcpy(&e1355_dispsw, d, sizeof *d);
+	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];
 
-	/* reading is terribly slow for us */
-#if 0 /* XXX: need to work out why this doesn't work */
-	e1355_dispsw.bmove = fbcon_redraw_bmove;
-#endif
-}
+	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);
 
-/* ------------ Interfaces to hardware functions ------------ */
+	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;
 
-struct fbgen_hwswitch e1355_switch = {
-	.detect =	e1355_detect,
-	.encode_fix =	e1355_encode_fix,
-	.decode_var =	e1355_decode_var,
-	.encode_var =	e1355_encode_var,
-	.get_par =	e1355_get_par,
-	.set_par =	e1355_set_par,
-	.getcolreg =	e1355_getcolreg,
-	.pan_display =	e1355_pan_display,
-	.blank =	e1355_blank,
-	.set_disp =	e1355_set_disp,
-};
+	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
+}
 
-/* ------------ Hardware Independent Functions ------------ */
 
+static void clearfb16(struct fb_info *info)
+{
+	u16 *dst = (u16 *) info->screen_base;
+	unsigned long n = info->fix.smem_len;
 
-static struct fb_ops e1355fb_ops = {
-	.owner =	THIS_MODULE,
-	.fb_get_fix =	fbgen_get_fix,
-	.fb_get_var =	fbgen_get_var,
-	.fb_set_var =	fbgen_set_var,
-	.fb_get_cmap =	fbgen_get_cmap,
-	.fb_set_cmap =	gen_set_cmap,
-	.fb_setcolreg =	e1355fb_setcolreg,
-	.fb_pan_display =fbgen_pan_display,
-	.fb_blank =	fbgen_blank,
-};
+	while (n > 1) {
+		fb_writew(0, dst);
+		dst++, n -= 2;
+	}
 
-static struct e1355fb_info fb_info;
+	if (n)
+		fb_writeb(0, dst);
+}
 
-int __init e1355fb_setup(char *str)
+static void epson1355fb_platform_release(struct device *device)
 {
-	return 0;
 }
 
-int __init e1355fb_init(void)
+static int epson1355fb_remove(struct device *device)
 {
-	fb_info.gen.fbhw = &e1355_switch;
-	fb_info.gen.fbhw->detect();
-	strcpy(fb_info.gen.info.modename, "SED1355");
-	fb_info.gen.info.changevar = NULL;
-	fb_info.gen.info.fbops = &e1355fb_ops;
-	fb_info.gen.info.screen_base = (void *)E1355_FB_BASE;
-	fb_info.gen.currcon = -1;
-	fb_info.gen.info.disp = &disp;
-	fb_info.gen.parsize = sizeof(struct e1355_par);
-	fb_info.gen.info.switch_con = &fbgen_switch;
-	fb_info.gen.info.updatevar = &fbgen_update_var;
-	fb_info.gen.info.flags = FBINFO_FLAG_DEFAULT;
-	/* This should give a reasonable default video mode */
-	fbgen_get_var(&disp.var, -1, &fb_info.gen.info);
-	fbgen_do_set_var(&disp.var, 1, &fb_info.gen);
-	fbgen_set_disp(-1, &fb_info.gen);
-	if (disp.var.bits_per_pixel > 1) 
-		do_install_cmap(0, &fb_info.gen);
-	if (register_framebuffer(&fb_info.gen.info) < 0)
-		return -EINVAL;
-	printk(KERN_INFO "fb%d: %s frame buffer device\n", fb_info.gen.info.node,
-	       fb_info.gen.info.modename);
+	struct fb_info *info = dev_get_drvdata(device);
+	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 device *device)
+{
+	struct platform_device *dev = to_platform_device(device);
+	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;
+	}
 
-    /*
-     *  Cleanup
-     */
+	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);
 
-void e1355fb_cleanup(struct fb_info *info)
-{
+	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;
+	}
 	/*
-	 *  If your driver supports multiple boards, you should unregister and
-	 *  clean up all instances.
+	 * Our driver data.
 	 */
+	dev_set_drvdata(&dev->dev, info);
+
+	printk(KERN_INFO "fb%d: %s frame buffer device\n",
+	       info->node, info->fix.id);
+
+	return 0;
+
+      bail:
+	epson1355fb_remove(device);
+	return rc;
+}
+
+static struct device_driver epson1355fb_driver = {
+	.name	= "epson1355fb",
+	.bus	= &platform_bus_type,
+	.probe	= epson1355fb_probe,
+	.remove	= epson1355fb_remove,
+};
+
+static struct platform_device epson1355fb_device = {
+	.name	= "epson1355fb",
+	.id	= 0,
+	.dev	= {
+		.release = epson1355fb_platform_release,
+	}
+};
+
+int __init epson1355fb_init(void)
+{
+	int ret = 0;
+
+	if (fb_get_options("epson1355fb", NULL))
+		return -ENODEV;
+
+	ret = driver_register(&epson1355fb_driver);
+	if (!ret) {
+		ret = platform_device_register(&epson1355fb_device);
+		if (ret)
+			driver_unregister(&epson1355fb_driver);
+	}
+	return ret;
+}
+
+module_init(epson1355fb_init);
 	
-	unregister_framebuffer(info);
-	/* ... */
+#ifdef MODULE
+static void __exit epson1355fb_exit(void)
+{
+	platform_device_unregister(&epson1355fb_device);
+	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");