Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 772 insertions, 0 deletions

diff --git a/drivers/video/s1d13xxxfb.c b/drivers/video/s1d13xxxfb.c
new file mode 100644
index 000000000000..b637c389e4f4
--- /dev/null
+++ b/drivers/video/s1d13xxxfb.c
@@ -0,0 +1,772 @@
+/* drivers/video/s1d13xxxfb.c
+ *
+ * (c) 2004 Simtec Electronics
+ * (c) 2005 Thibaut VARENE <varenet@parisc-linux.org>
+ *
+ * Driver for Epson S1D13xxx series framebuffer chips
+ *
+ * Adapted from
+ *  linux/drivers/video/skeletonfb.c
+ *  linux/drivers/video/epson1355fb.c
+ *  linux/drivers/video/epson/s1d13xxxfb.c (2.4 driver by Epson)
+ *
+ * Note, currently only tested on S1D13806 with 16bit CRT.
+ * As such, this driver might still contain some hardcoded bits relating to
+ * S1D13806.
+ * Making it work on other S1D13XXX chips should merely be a matter of adding
+ * a few switch()s, some missing glue here and there maybe, and split header
+ * files.
+ *
+ * TODO: - handle dual screen display (CRT and LCD at the same time).
+ *       - check_var(), mode change, etc.
+ *       - PM untested.
+ *       - Accelerated interfaces.
+ *       - Probably not SMP safe :)
+ *
+ * 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.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/fb.h>
+
+#include <asm/io.h>
+
+#include <video/s1d13xxxfb.h>
+
+#define PFX "s1d13xxxfb: "
+
+#if 0
+#define dbg(fmt, args...) do { printk(KERN_INFO fmt, ## args); } while(0)
+#else
+#define dbg(fmt, args...) do { } while (0)
+#endif
+
+/*
+ * Here we define the default struct fb_fix_screeninfo
+ */
+static struct fb_fix_screeninfo __devinitdata s1d13xxxfb_fix = {
+        .id             = S1D_FBID,
+        .type           = FB_TYPE_PACKED_PIXELS,
+        .visual         = FB_VISUAL_PSEUDOCOLOR,
+        .xpanstep       = 0,
+        .ypanstep       = 1,
+        .ywrapstep      = 0,
+        .accel          = FB_ACCEL_NONE,
+};
+
+static inline u8
+s1d13xxxfb_readreg(struct s1d13xxxfb_par *par, u16 regno)
+{
+        return readb(par->regs + regno);
+}
+
+static inline void
+s1d13xxxfb_writereg(struct s1d13xxxfb_par *par, u16 regno, u8 value)
+{
+        writeb(value, par->regs + regno);
+}
+
+static inline void
+s1d13xxxfb_runinit(struct s1d13xxxfb_par *par,
+                        const struct s1d13xxxfb_regval *initregs,
+                        const unsigned int size)
+{
+        int i;
+
+        for (i = 0; i < size; i++) {
+                if ((initregs[i].addr == S1DREG_DELAYOFF) ||
+                                (initregs[i].addr == S1DREG_DELAYON))
+                        mdelay((int)initregs[i].value);
+                else {
+                        s1d13xxxfb_writereg(par, initregs[i].addr, initregs[i].value);
+                }
+        }
+
+        /* make sure the hardware can cope with us */
+        mdelay(1);
+}
+
+static inline void
+lcd_enable(struct s1d13xxxfb_par *par, int enable)
+{
+        u8 mode = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
+
+        if (enable)
+                mode |= 0x01;
+        else
+                mode &= ~0x01;
+
+        s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, mode);
+}
+
+static inline void
+crt_enable(struct s1d13xxxfb_par *par, int enable)
+{
+        u8 mode = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
+
+        if (enable)
+                mode |= 0x02;
+        else
+                mode &= ~0x02;
+
+        s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, mode);
+}
+
+/* framebuffer control routines */
+
+static inline void
+s1d13xxxfb_setup_pseudocolour(struct fb_info *info)
+{
+        info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+
+        info->var.red.length = 4;
+        info->var.green.length = 4;
+        info->var.blue.length = 4;
+}
+
+static inline void
+s1d13xxxfb_setup_truecolour(struct fb_info *info)
+{
+        info->fix.visual = FB_VISUAL_TRUECOLOR;
+        info->var.bits_per_pixel = 16;
+
+        info->var.red.length = 5;
+        info->var.red.offset = 11;
+
+        info->var.green.length = 6;
+        info->var.green.offset = 5;
+
+        info->var.blue.length = 5;
+        info->var.blue.offset = 0;
+}
+
+/**
+ *      s1d13xxxfb_set_par - Alters the hardware state.
+ *      @info: frame buffer structure
+ *
+ *      Using the fb_var_screeninfo in fb_info we set the depth of the
+ *      framebuffer. This function alters the par AND the
+ *      fb_fix_screeninfo stored in fb_info. It doesn't not alter var in
+ *      fb_info since we are using that data. This means we depend on the
+ *      data in var inside fb_info to be supported by the hardware.
+ *      xxxfb_check_var is always called before xxxfb_set_par to ensure this.
+ *
+ *      XXX TODO: write proper s1d13xxxfb_check_var(), without which that
+ *      function is quite useless.
+ */
+static int
+s1d13xxxfb_set_par(struct fb_info *info)
+{
+        struct s1d13xxxfb_par *s1dfb = info->par;
+        unsigned int val;
+
+        dbg("s1d13xxxfb_set_par: bpp=%d\n", info->var.bits_per_pixel);
+
+        if ((s1dfb->display & 0x01))    /* LCD */
+                val = s1d13xxxfb_readreg(s1dfb, S1DREG_LCD_DISP_MODE);   /* read colour control */
+        else    /* CRT */
+                val = s1d13xxxfb_readreg(s1dfb, S1DREG_CRT_DISP_MODE);   /* read colour control */
+
+        val &= ~0x07;
+
+        switch (info->var.bits_per_pixel) {
+                case 4:
+                        dbg("pseudo colour 4\n");
+                        s1d13xxxfb_setup_pseudocolour(info);
+                        val |= 2;
+                        break;
+                case 8:
+                        dbg("pseudo colour 8\n");
+                        s1d13xxxfb_setup_pseudocolour(info);
+                        val |= 3;
+                        break;
+                case 16:
+                        dbg("true colour\n");
+                        s1d13xxxfb_setup_truecolour(info);
+                        val |= 5;
+                        break;
+
+                default:
+                        dbg("bpp not supported!\n");
+                        return -EINVAL;
+        }
+
+        dbg("writing %02x to display mode register\n", val);
+
+        if ((s1dfb->display & 0x01))    /* LCD */
+                s1d13xxxfb_writereg(s1dfb, S1DREG_LCD_DISP_MODE, val);
+        else    /* CRT */
+                s1d13xxxfb_writereg(s1dfb, S1DREG_CRT_DISP_MODE, val);
+
+        info->fix.line_length  = info->var.xres * info->var.bits_per_pixel;
+        info->fix.line_length /= 8;
+
+        dbg("setting line_length to %d\n", info->fix.line_length);
+
+        dbg("done setup\n");
+
+        return 0;
+}
+
+/**
+ *      s1d13xxxfb_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
+s1d13xxxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+                        u_int transp, struct fb_info *info)
+{
+        struct s1d13xxxfb_par *s1dfb = info->par;
+        unsigned int pseudo_val;
+
+        if (regno >= S1D_PALETTE_SIZE)
+                return -EINVAL;
+
+        dbg("s1d13xxxfb_setcolreg: %d: rgb=%d,%d,%d, tr=%d\n",
+                    regno, red, green, blue, transp);
+
+        if (info->var.grayscale)
+                red = green = blue = (19595*red + 38470*green + 7471*blue) >> 16;
+
+        switch (info->fix.visual) {
+                case FB_VISUAL_TRUECOLOR:
+                        if (regno >= 16)
+                                return -EINVAL;
+
+                        /* deal with creating pseudo-palette entries */
+
+                        pseudo_val  = (red   >> 11) << info->var.red.offset;
+                        pseudo_val |= (green >> 10) << info->var.green.offset;
+                        pseudo_val |= (blue  >> 11) << info->var.blue.offset;
+
+                        dbg("s1d13xxxfb_setcolreg: pseudo %d, val %08x\n",
+                                    regno, pseudo_val);
+
+                        ((u32 *)info->pseudo_palette)[regno] = pseudo_val;
+
+                        break;
+                case FB_VISUAL_PSEUDOCOLOR:
+                        s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_ADDR, regno);
+                        s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, red);
+                        s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, green);
+                        s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, blue);
+
+                        break;
+                default:
+                        return -ENOSYS;
+        }
+
+        dbg("s1d13xxxfb_setcolreg: done\n");
+
+        return 0;
+}
+
+/**
+ *      s1d13xxxfb_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
+s1d13xxxfb_blank(int blank_mode, struct fb_info *info)
+{
+        struct s1d13xxxfb_par *par = info->par;
+
+        dbg("s1d13xxxfb_blank: blank=%d, info=%p\n", blank_mode, info);
+
+        switch (blank_mode) {
+                case FB_BLANK_UNBLANK:
+                case FB_BLANK_NORMAL:
+                        if ((par->display & 0x01) != 0)
+                                lcd_enable(par, 1);
+                        if ((par->display & 0x02) != 0)
+                                crt_enable(par, 1);
+                        break;
+                case FB_BLANK_VSYNC_SUSPEND:
+                case FB_BLANK_HSYNC_SUSPEND:
+                        break;
+                case FB_BLANK_POWERDOWN:
+                        lcd_enable(par, 0);
+                        crt_enable(par, 0);
+                        break;
+                default:
+                        return -EINVAL;
+        }
+
+        /* let fbcon do a soft blank for us */
+        return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
+}
+
+/**
+ *      s1d13xxxfb_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
+ *      `yoffset' field of the `var' structure (`xoffset'  not yet supported).
+ *      If the values don't fit, return -EINVAL.
+ *
+ *      Returns negative errno on error, or zero on success.
+ */
+static int
+s1d13xxxfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+        struct s1d13xxxfb_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;
+
+        if ((par->display & 0x01)) {
+                /* LCD */
+                s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START0, (start & 0xff));
+                s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START1, ((start >> 8) & 0xff));
+                s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START2, ((start >> 16) & 0x0f));
+        } else {
+                /* CRT */
+                s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START0, (start & 0xff));
+                s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START1, ((start >> 8) & 0xff));
+                s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START2, ((start >> 16) & 0x0f));
+        }
+
+        return 0;
+}
+
+
+/* framebuffer information structures */
+
+static struct fb_ops s1d13xxxfb_fbops = {
+        .owner          = THIS_MODULE,
+        .fb_set_par     = s1d13xxxfb_set_par,
+        .fb_setcolreg   = s1d13xxxfb_setcolreg,
+        .fb_blank       = s1d13xxxfb_blank,
+
+        .fb_pan_display = s1d13xxxfb_pan_display,
+
+        /* to be replaced by any acceleration we can */
+        .fb_fillrect    = cfb_fillrect,
+        .fb_copyarea    = cfb_copyarea,
+        .fb_imageblit   = cfb_imageblit,
+        .fb_cursor      = soft_cursor
+};
+
+static int s1d13xxxfb_width_tab[2][4] __devinitdata = {
+        {4, 8, 16, -1},
+        {9, 12, 18, -1},
+};
+
+/**
+ *      s1d13xxxfb_fetch_hw_state - Configure the framebuffer according to
+ *      hardware setup.
+ *      @info: frame buffer structure
+ *
+ *      We setup the framebuffer structures according to the current
+ *      hardware setup. On some machines, the BIOS will have filled
+ *      the chip registers with such info, on others, these values will
+ *      have been written in some init procedure. In any case, the
+ *      software values needs to match the hardware ones. This is what
+ *      this function ensures.
+ *
+ *      Note: some of the hardcoded values here might need some love to
+ *      work on various chips, and might need to no longer be hardcoded.
+ */
+static void __devinit
+s1d13xxxfb_fetch_hw_state(struct fb_info *info)
+{
+        struct fb_var_screeninfo *var = &info->var;
+        struct fb_fix_screeninfo *fix = &info->fix;
+        struct s1d13xxxfb_par *par = info->par;
+        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;
+
+        /* general info */
+        par->display = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
+        crt_enabled = (par->display & 0x02) != 0;
+        lcd_enabled = (par->display & 0x01) != 0;
+
+        if (lcd_enabled && crt_enabled)
+                printk(KERN_WARNING PFX "Warning: LCD and CRT detected, using LCD\n");
+
+        if (lcd_enabled)
+                display = s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_MODE);
+        else    /* CRT */
+                display = s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_MODE);
+
+        bpp = display & 0x07;
+
+        switch (bpp) {
+                case 2: /* 4 bpp */
+                case 3: /* 8 bpp */
+                        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 5: /* 16 bpp */
+                        s1d13xxxfb_setup_truecolour(info);
+                        break;
+                default:
+                        dbg("bpp: %i\n", bpp);
+        }
+        fb_alloc_cmap(&info->cmap, 256, 0);
+
+        /* LCD info */
+        panel = s1d13xxxfb_readreg(par, S1DREG_PANEL_TYPE);
+        is_color = (panel & 0x04) != 0;
+        is_dual = (panel & 0x02) != 0;
+        is_tft = (panel & 0x01) != 0;
+        lcd_bpp = s1d13xxxfb_width_tab[is_tft][(panel >> 4) & 3];
+
+        if (lcd_enabled) {
+                xres = (s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_HWIDTH) + 1) * 8;
+                yres = (s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_VHEIGHT0) +
+                        ((s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_VHEIGHT1) & 0x03) << 8) + 1);
+
+                offset = (s1d13xxxfb_readreg(par, S1DREG_LCD_MEM_OFF0) +
+                        ((s1d13xxxfb_readreg(par, S1DREG_LCD_MEM_OFF1) & 0x7) << 8));
+        } else { /* crt */
+                xres = (s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_HWIDTH) + 1) * 8;
+                yres = (s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_VHEIGHT0) +
+                        ((s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_VHEIGHT1) & 0x03) << 8) + 1);
+
+                offset = (s1d13xxxfb_readreg(par, S1DREG_CRT_MEM_OFF0) +
+                        ((s1d13xxxfb_readreg(par, S1DREG_CRT_MEM_OFF1) & 0x7) << 8));
+        }
+        xres_virtual = offset * 16 / var->bits_per_pixel;
+        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;
+
+        var->grayscale          = !is_color;
+
+        var->activate           = FB_ACTIVATE_NOW;
+
+        dbg(PFX "bpp=%d, lcd_bpp=%d, "
+                "crt_enabled=%d, lcd_enabled=%d\n",
+                var->bits_per_pixel, lcd_bpp, crt_enabled, lcd_enabled);
+        dbg(PFX "xres=%d, yres=%d, vxres=%d, vyres=%d "
+                "is_color=%d, is_dual=%d, is_tft=%d\n",
+                xres, yres, xres_virtual, yres_virtual, is_color, is_dual, is_tft);
+}
+
+
+static int __devexit
+s1d13xxxfb_remove(struct device *dev)
+{
+        struct fb_info *info = dev_get_drvdata(dev);
+        struct platform_device *pdev = to_platform_device(dev);
+        struct s1d13xxxfb_par *par = NULL;
+
+        if (info) {
+                par = info->par;
+                if (par && par->regs) {
+                        /* disable output & enable powersave */
+                        s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, 0x00);
+                        s1d13xxxfb_writereg(par, S1DREG_PS_CNF, 0x11);
+                        iounmap(par->regs);
+                }
+
+                fb_dealloc_cmap(&info->cmap);
+
+                if (info->screen_base)
+                        iounmap(info->screen_base);
+
+                framebuffer_release(info);
+        }
+
+        release_mem_region(pdev->resource[0].start,
+                        pdev->resource[0].end - pdev->resource[0].start +1);
+        release_mem_region(pdev->resource[1].start,
+                        pdev->resource[1].end - pdev->resource[1].start +1);
+        return 0;
+}
+
+static int __devinit
+s1d13xxxfb_probe(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct s1d13xxxfb_par *default_par;
+        struct fb_info *info;
+        struct s1d13xxxfb_pdata *pdata = NULL;
+        int ret = 0;
+        u8 revision;
+
+        dbg("probe called: device is %p\n", dev);
+
+        printk(KERN_INFO "Epson S1D13XXX FB Driver\n");
+
+        /* enable platform-dependent hardware glue, if any */
+        if (dev->platform_data)
+                pdata = dev->platform_data;
+
+        if (pdata && pdata->platform_init_video)
+                pdata->platform_init_video();
+
+
+        if (pdev->num_resources != 2) {
+                dev_err(&pdev->dev, "invalid num_resources: %i\n",
+                       pdev->num_resources);
+                ret = -ENODEV;
+                goto bail;
+        }
+
+        /* resource[0] is VRAM, resource[1] is registers */
+        if (pdev->resource[0].flags != IORESOURCE_MEM
+                        || pdev->resource[1].flags != IORESOURCE_MEM) {
+                dev_err(&pdev->dev, "invalid resource type\n");
+                ret = -ENODEV;
+                goto bail;
+        }
+
+        if (!request_mem_region(pdev->resource[0].start,
+                pdev->resource[0].end - pdev->resource[0].start +1, "s1d13xxxfb mem")) {
+                dev_dbg(dev, "request_mem_region failed\n");
+                ret = -EBUSY;
+                goto bail;
+        }
+
+        if (!request_mem_region(pdev->resource[1].start,
+                pdev->resource[1].end - pdev->resource[1].start +1, "s1d13xxxfb regs")) {
+                dev_dbg(dev, "request_mem_region failed\n");
+                ret = -EBUSY;
+                goto bail;
+        }
+
+        info = framebuffer_alloc(sizeof(struct s1d13xxxfb_par) + sizeof(u32) * 256, &pdev->dev);
+        if (!info) {
+                ret = -ENOMEM;
+                goto bail;
+        }
+
+        default_par = info->par;
+        default_par->regs = ioremap_nocache(pdev->resource[1].start,
+                        pdev->resource[1].end - pdev->resource[1].start +1);
+        if (!default_par->regs) {
+                printk(KERN_ERR PFX "unable to map registers\n");
+                ret = -ENOMEM;
+                goto bail;
+        }
+        info->pseudo_palette = default_par->pseudo_palette;
+
+        info->screen_base = ioremap_nocache(pdev->resource[0].start,
+                        pdev->resource[0].end - pdev->resource[0].start +1);
+
+        if (!info->screen_base) {
+                printk(KERN_ERR PFX "unable to map framebuffer\n");
+                ret = -ENOMEM;
+                goto bail;
+        }
+
+        revision = s1d13xxxfb_readreg(default_par, S1DREG_REV_CODE);
+        if ((revision >> 2) != S1D_CHIP_REV) {
+                printk(KERN_INFO PFX "chip not found: %i\n", (revision >> 2));
+                ret = -ENODEV;
+                goto bail;
+        }
+
+        info->fix = s1d13xxxfb_fix;
+        info->fix.mmio_start = pdev->resource[1].start;
+        info->fix.mmio_len = pdev->resource[1].end - pdev->resource[1].start +1;
+        info->fix.smem_start = pdev->resource[0].start;
+        info->fix.smem_len = pdev->resource[0].end - pdev->resource[0].start +1;
+
+        printk(KERN_INFO PFX "regs mapped at 0x%p, fb %d KiB mapped at 0x%p\n",
+               default_par->regs, info->fix.smem_len / 1024, info->screen_base);
+
+        info->par = default_par;
+        info->fbops = &s1d13xxxfb_fbops;
+        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
+
+        /* perform "manual" chip initialization, if needed */
+        if (pdata && pdata->initregs)
+                s1d13xxxfb_runinit(info->par, pdata->initregs, pdata->initregssize);
+
+        s1d13xxxfb_fetch_hw_state(info);
+
+        if (register_framebuffer(info) < 0) {
+                ret = -EINVAL;
+                goto bail;
+        }
+
+        dev_set_drvdata(&pdev->dev, info);
+
+        printk(KERN_INFO "fb%d: %s frame buffer device\n",
+               info->node, info->fix.id);
+
+        return 0;
+
+bail:
+        s1d13xxxfb_remove(dev);
+        return ret;
+
+}
+
+#ifdef CONFIG_PM
+static int s1d13xxxfb_suspend(struct device *dev, u32 state, u32 level)
+{
+        struct fb_info *info = dev_get_drvdata(dev);
+        struct s1d13xxxfb_par *s1dfb = info->par;
+        struct s1d13xxxfb_pdata *pdata = NULL;
+
+        /* disable display */
+        lcd_enable(s1dfb, 0);
+        crt_enable(s1dfb, 0);
+
+        if (dev->platform_data)
+                pdata = dev->platform_data;
+
+#if 0
+        if (!s1dfb->disp_save)
+                s1dfb->disp_save = kmalloc(info->fix.smem_len, GFP_KERNEL);
+
+        if (!s1dfb->disp_save) {
+                printk(KERN_ERR PFX "no memory to save screen");
+                return -ENOMEM;
+        }
+
+        memcpy_fromio(s1dfb->disp_save, info->screen_base, info->fix.smem_len);
+#else
+        s1dfb->disp_save = NULL;
+#endif
+
+        if (!s1dfb->regs_save)
+                s1dfb->regs_save = kmalloc(info->fix.mmio_len, GFP_KERNEL);
+
+        if (!s1dfb->regs_save) {
+                printk(KERN_ERR PFX "no memory to save registers");
+                return -ENOMEM;
+        }
+
+        /* backup all registers */
+        memcpy_fromio(s1dfb->regs_save, s1dfb->regs, info->fix.mmio_len);
+
+        /* now activate power save mode */
+        s1d13xxxfb_writereg(s1dfb, S1DREG_PS_CNF, 0x11);
+
+        if (pdata && pdata->platform_suspend_video)
+                return pdata->platform_suspend_video();
+        else
+                return 0;
+}
+
+static int s1d13xxxfb_resume(struct device *dev, u32 level)
+{
+        struct fb_info *info = dev_get_drvdata(dev);
+        struct s1d13xxxfb_par *s1dfb = info->par;
+        struct s1d13xxxfb_pdata *pdata = NULL;
+
+        if (level != RESUME_ENABLE)
+                return 0;
+
+        /* awaken the chip */
+        s1d13xxxfb_writereg(s1dfb, S1DREG_PS_CNF, 0x10);
+
+        /* do not let go until SDRAM "wakes up" */
+        while ((s1d13xxxfb_readreg(s1dfb, S1DREG_PS_STATUS) & 0x01))
+                udelay(10);
+
+        if (dev->platform_data)
+                pdata = dev->platform_data;
+
+        if (s1dfb->regs_save) {
+                /* will write RO regs, *should* get away with it :) */
+                memcpy_toio(s1dfb->regs, s1dfb->regs_save, info->fix.mmio_len);
+                kfree(s1dfb->regs_save);
+        }
+
+        if (s1dfb->disp_save) {
+                memcpy_toio(info->screen_base, s1dfb->disp_save,
+                                info->fix.smem_len);
+                kfree(s1dfb->disp_save);        /* XXX kmalloc()'d when? */
+        }
+
+        if ((s1dfb->display & 0x01) != 0)
+                lcd_enable(s1dfb, 1);
+        if ((s1dfb->display & 0x02) != 0)
+                crt_enable(s1dfb, 1);
+
+        if (pdata && pdata->platform_resume_video)
+                return pdata->platform_resume_video();
+        else
+                return 0;
+}
+#endif /* CONFIG_PM */
+
+static struct device_driver s1d13xxxfb_driver = {
+        .name           = S1D_DEVICENAME,
+        .bus            = &platform_bus_type,
+        .probe          = s1d13xxxfb_probe,
+        .remove         = s1d13xxxfb_remove,
+#ifdef CONFIG_PM
+        .suspend        = s1d13xxxfb_suspend,
+        .resume         = s1d13xxxfb_resume
+#endif
+};
+
+
+static int __init
+s1d13xxxfb_init(void)
+{
+        if (fb_get_options("s1d13xxxfb", NULL))
+                return -ENODEV;
+
+        return driver_register(&s1d13xxxfb_driver);
+}
+
+
+static void __exit
+s1d13xxxfb_exit(void)
+{
+        driver_unregister(&s1d13xxxfb_driver);
+}
+
+module_init(s1d13xxxfb_init);
+module_exit(s1d13xxxfb_exit);
+
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Framebuffer driver for S1D13xxx devices");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Thibaut VARENE <varenet@parisc-linux.org>");