Merge branch 'fbdev/udlfb'

7 files changed, 0 insertions, 2195 deletions

diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 5eafdf43555..df31a722807 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -111,8 +111,6 @@ source "drivers/staging/vt6655/Kconfig"
 
 source "drivers/staging/vt6656/Kconfig"
 
-source "drivers/staging/udlfb/Kconfig"
-
 source "drivers/staging/hv/Kconfig"
 
 source "drivers/staging/vme/Kconfig"
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index a97a955c094..7a15c0c82b6 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -38,7 +38,6 @@ obj-$(CONFIG_USB_SERIAL_QUATECH_USB2)	+= quatech_usb2/
 obj-$(CONFIG_OCTEON_ETHERNET)	+= octeon/
 obj-$(CONFIG_VT6655)		+= vt6655/
 obj-$(CONFIG_VT6656)		+= vt6656/
-obj-$(CONFIG_FB_UDL)		+= udlfb/
 obj-$(CONFIG_HYPERV)		+= hv/
 obj-$(CONFIG_VME_BUS)		+= vme/
 obj-$(CONFIG_MRST_RAR_HANDLER)	+= memrar/
diff --git a/drivers/staging/udlfb/Kconfig b/drivers/staging/udlfb/Kconfig
deleted file mode 100644
index 65bd5db4ca5..00000000000
--- a/drivers/staging/udlfb/Kconfig
+++ /dev/null
@@ -1,14 +0,0 @@
-config FB_UDL
-	tristate "Displaylink USB Framebuffer support"
-	depends on FB && USB
-	select FB_MODE_HELPERS
-	select FB_SYS_FILLRECT
-	select FB_SYS_COPYAREA
-	select FB_SYS_IMAGEBLIT
-	select FB_SYS_FOPS
-	select FB_DEFERRED_IO
-	---help---
-	  This is a kernel framebuffer driver for DisplayLink USB devices.
-	  Supports fbdev clients like xf86-video-fbdev, kdrive, fbi, and
-	  mplayer -vo fbdev. Supports all USB 2.0 era DisplayLink devices.
-	  To compile as a module, choose M here: the module name is udlfb.
diff --git a/drivers/staging/udlfb/Makefile b/drivers/staging/udlfb/Makefile
deleted file mode 100644
index 30d9e675b10..00000000000
--- a/drivers/staging/udlfb/Makefile
+++ /dev/null
@@ -1 +0,0 @@
-obj-$(CONFIG_FB_UDL)		+= udlfb.o
diff --git a/drivers/staging/udlfb/udlfb.c b/drivers/staging/udlfb/udlfb.c
deleted file mode 100644
index b7ac1600526..00000000000
--- a/drivers/staging/udlfb/udlfb.c
+++ /dev/null
@@ -1,1916 +0,0 @@
-/*
- * udlfb.c -- Framebuffer driver for DisplayLink USB controller
- *
- * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
- * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
- * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License v2. See the file COPYING in the main directory of this archive for
- * more details.
- *
- * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,
- * usb-skeleton by GregKH.
- *
- * Device-specific portions based on information from Displaylink, with work
- * from Florian Echtler, Henrik Bjerregaard Pedersen, and others.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/usb.h>
-#include <linux/uaccess.h>
-#include <linux/mm.h>
-#include <linux/fb.h>
-#include <linux/vmalloc.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-
-#include "udlfb.h"
-
-static struct fb_fix_screeninfo dlfb_fix = {
-	.id =           "udlfb",
-	.type =         FB_TYPE_PACKED_PIXELS,
-	.visual =       FB_VISUAL_TRUECOLOR,
-	.xpanstep =     0,
-	.ypanstep =     0,
-	.ywrapstep =    0,
-	.accel =        FB_ACCEL_NONE,
-};
-
-static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST |
-#ifdef FBINFO_VIRTFB
-		FBINFO_VIRTFB |
-#endif
-		FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |
-		FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;
-
-/*
- * There are many DisplayLink-based products, all with unique PIDs. We are able
- * to support all volume ones (circa 2009) with a single driver, so we match
- * globally on VID. TODO: Probe() needs to detect when we might be running
- * "future" chips, and bail on those, so a compatible driver can match.
- */
-static struct usb_device_id id_table[] = {
-	{.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,},
-	{},
-};
-MODULE_DEVICE_TABLE(usb, id_table);
-
-/* module options */
-static int console;   /* Optionally allow fbcon to consume first framebuffer */
-static int fb_defio;  /* Optionally enable experimental fb_defio mmap support */
-
-/* dlfb keeps a list of urbs for efficient bulk transfers */
-static void dlfb_urb_completion(struct urb *urb);
-static struct urb *dlfb_get_urb(struct dlfb_data *dev);
-static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len);
-static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size);
-static void dlfb_free_urb_list(struct dlfb_data *dev);
-
-/*
- * All DisplayLink bulk operations start with 0xAF, followed by specific code
- * All operations are written to buffers which then later get sent to device
- */
-static char *dlfb_set_register(char *buf, u8 reg, u8 val)
-{
-	*buf++ = 0xAF;
-	*buf++ = 0x20;
-	*buf++ = reg;
-	*buf++ = val;
-	return buf;
-}
-
-static char *dlfb_vidreg_lock(char *buf)
-{
-	return dlfb_set_register(buf, 0xFF, 0x00);
-}
-
-static char *dlfb_vidreg_unlock(char *buf)
-{
-	return dlfb_set_register(buf, 0xFF, 0xFF);
-}
-
-/*
- * On/Off for driving the DisplayLink framebuffer to the display
- *  0x00 H and V sync on
- *  0x01 H and V sync off (screen blank but powered)
- *  0x07 DPMS powerdown (requires modeset to come back)
- */
-static char *dlfb_enable_hvsync(char *buf, bool enable)
-{
-	if (enable)
-		return dlfb_set_register(buf, 0x1F, 0x00);
-	else
-		return dlfb_set_register(buf, 0x1F, 0x07);
-}
-
-static char *dlfb_set_color_depth(char *buf, u8 selection)
-{
-	return dlfb_set_register(buf, 0x00, selection);
-}
-
-static char *dlfb_set_base16bpp(char *wrptr, u32 base)
-{
-	/* the base pointer is 16 bits wide, 0x20 is hi byte. */
-	wrptr = dlfb_set_register(wrptr, 0x20, base >> 16);
-	wrptr = dlfb_set_register(wrptr, 0x21, base >> 8);
-	return dlfb_set_register(wrptr, 0x22, base);
-}
-
-/*
- * DisplayLink HW has separate 16bpp and 8bpp framebuffers.
- * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
- */
-static char *dlfb_set_base8bpp(char *wrptr, u32 base)
-{
-	wrptr = dlfb_set_register(wrptr, 0x26, base >> 16);
-	wrptr = dlfb_set_register(wrptr, 0x27, base >> 8);
-	return dlfb_set_register(wrptr, 0x28, base);
-}
-
-static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value)
-{
-	wrptr = dlfb_set_register(wrptr, reg, value >> 8);
-	return dlfb_set_register(wrptr, reg+1, value);
-}
-
-/*
- * This is kind of weird because the controller takes some
- * register values in a different byte order than other registers.
- */
-static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value)
-{
-	wrptr = dlfb_set_register(wrptr, reg, value);
-	return dlfb_set_register(wrptr, reg+1, value >> 8);
-}
-
-/*
- * LFSR is linear feedback shift register. The reason we have this is
- * because the display controller needs to minimize the clock depth of
- * various counters used in the display path. So this code reverses the
- * provided value into the lfsr16 value by counting backwards to get
- * the value that needs to be set in the hardware comparator to get the
- * same actual count. This makes sense once you read above a couple of
- * times and think about it from a hardware perspective.
- */
-static u16 dlfb_lfsr16(u16 actual_count)
-{
-	u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
-
-	while (actual_count--) {
-		lv =	 ((lv << 1) |
-			(((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))
-			& 0xFFFF;
-	}
-
-	return (u16) lv;
-}
-
-/*
- * This does LFSR conversion on the value that is to be written.
- * See LFSR explanation above for more detail.
- */
-static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
-{
-	return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value));
-}
-
-/*
- * This takes a standard fbdev screeninfo struct and all of its monitor mode
- * details and converts them into the DisplayLink equivalent register commands.
- */
-static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var)
-{
-	u16 xds, yds;
-	u16 xde, yde;
-	u16 yec;
-
-	/* x display start */
-	xds = var->left_margin + var->hsync_len;
-	wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds);
-	/* x display end */
-	xde = xds + var->xres;
-	wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde);
-
-	/* y display start */
-	yds = var->upper_margin + var->vsync_len;
-	wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds);
-	/* y display end */
-	yde = yds + var->yres;
-	wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde);
-
-	/* x end count is active + blanking - 1 */
-	wrptr = dlfb_set_register_lfsr16(wrptr, 0x09,
-			xde + var->right_margin - 1);
-
-	/* libdlo hardcodes hsync start to 1 */
-	wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1);
-
-	/* hsync end is width of sync pulse + 1 */
-	wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1);
-
-	/* hpixels is active pixels */
-	wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres);
-
-	/* yendcount is vertical active + vertical blanking */
-	yec = var->yres + var->upper_margin + var->lower_margin +
-			var->vsync_len;
-	wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec);
-
-	/* libdlo hardcodes vsync start to 0 */
-	wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0);
-
-	/* vsync end is width of vsync pulse */
-	wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len);
-
-	/* vpixels is active pixels */
-	wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres);
-
-	/* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */
-	wrptr = dlfb_set_register_16be(wrptr, 0x1B,
-			200*1000*1000/var->pixclock);
-
-	return wrptr;
-}
-
-/*
- * This takes a standard fbdev screeninfo struct that was fetched or prepared
- * and then generates the appropriate command sequence that then drives the
- * display controller.
- */
-static int dlfb_set_video_mode(struct dlfb_data *dev,
-				struct fb_var_screeninfo *var)
-{
-	char *buf;
-	char *wrptr;
-	int retval = 0;
-	int writesize;
-	struct urb *urb;
-
-	if (!atomic_read(&dev->usb_active))
-		return -EPERM;
-
-	urb = dlfb_get_urb(dev);
-	if (!urb)
-		return -ENOMEM;
-
-	buf = (char *) urb->transfer_buffer;
-
-	/*
-	* This first section has to do with setting the base address on the
-	* controller * associated with the display. There are 2 base
-	* pointers, currently, we only * use the 16 bpp segment.
-	*/
-	wrptr = dlfb_vidreg_lock(buf);
-	wrptr = dlfb_set_color_depth(wrptr, 0x00);
-	/* set base for 16bpp segment to 0 */
-	wrptr = dlfb_set_base16bpp(wrptr, 0);
-	/* set base for 8bpp segment to end of fb */
-	wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len);
-
-	wrptr = dlfb_set_vid_cmds(wrptr, var);
-	wrptr = dlfb_enable_hvsync(wrptr, true);
-	wrptr = dlfb_vidreg_unlock(wrptr);
-
-	writesize = wrptr - buf;
-
-	retval = dlfb_submit_urb(dev, urb, writesize);
-
-	return retval;
-}
-
-static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
-{
-	unsigned long start = vma->vm_start;
-	unsigned long size = vma->vm_end - vma->vm_start;
-	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
-	unsigned long page, pos;
-
-	if (offset + size > info->fix.smem_len)
-		return -EINVAL;
-
-	pos = (unsigned long)info->fix.smem_start + offset;
-
-	dl_notice("mmap() framebuffer addr:%lu size:%lu\n",
-		  pos, size);
-
-	while (size > 0) {
-		page = vmalloc_to_pfn((void *)pos);
-		if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
-			return -EAGAIN;
-
-		start += PAGE_SIZE;
-		pos += PAGE_SIZE;
-		if (size > PAGE_SIZE)
-			size -= PAGE_SIZE;
-		else
-			size = 0;
-	}
-
-	vma->vm_flags |= VM_RESERVED;	/* avoid to swap out this VMA */
-	return 0;
-}
-
-/*
- * Trims identical data from front and back of line
- * Sets new front buffer address and width
- * And returns byte count of identical pixels
- * Assumes CPU natural alignment (unsigned long)
- * for back and front buffer ptrs and width
- */
-static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes)
-{
-	int j, k;
-	const unsigned long *back = (const unsigned long *) bback;
-	const unsigned long *front = (const unsigned long *) *bfront;
-	const int width = *width_bytes / sizeof(unsigned long);
-	int identical = width;
-	int start = width;
-	int end = width;
-
-	prefetch((void *) front);
-	prefetch((void *) back);
-
-	for (j = 0; j < width; j++) {
-		if (back[j] != front[j]) {
-			start = j;
-			break;
-		}
-	}
-
-	for (k = width - 1; k > j; k--) {
-		if (back[k] != front[k]) {
-			end = k+1;
-			break;
-		}
-	}
-
-	identical = start + (width - end);
-	*bfront = (u8 *) &front[start];
-	*width_bytes = (end - start) * sizeof(unsigned long);
-
-	return identical * sizeof(unsigned long);
-}
-
-/*
- * Render a command stream for an encoded horizontal line segment of pixels.
- *
- * A command buffer holds several commands.
- * It always begins with a fresh command header
- * (the protocol doesn't require this, but we enforce it to allow
- * multiple buffers to be potentially encoded and sent in parallel).
- * A single command encodes one contiguous horizontal line of pixels
- *
- * The function relies on the client to do all allocation, so that
- * rendering can be done directly to output buffers (e.g. USB URBs).
- * The function fills the supplied command buffer, providing information
- * on where it left off, so the client may call in again with additional
- * buffers if the line will take several buffers to complete.
- *
- * A single command can transmit a maximum of 256 pixels,
- * regardless of the compression ratio (protocol design limit).
- * To the hardware, 0 for a size byte means 256
- *
- * Rather than 256 pixel commands which are either rl or raw encoded,
- * the rlx command simply assumes alternating raw and rl spans within one cmd.
- * This has a slightly larger header overhead, but produces more even results.
- * It also processes all data (read and write) in a single pass.
- * Performance benchmarks of common cases show it having just slightly better
- * compression than 256 pixel raw or rle commands, with similar CPU consumpion.
- * But for very rl friendly data, will compress not quite as well.
- */
-static void dlfb_compress_hline(
-	const uint16_t **pixel_start_ptr,
-	const uint16_t *const pixel_end,
-	uint32_t *device_address_ptr,
-	uint8_t **command_buffer_ptr,
-	const uint8_t *const cmd_buffer_end)
-{
-	const uint16_t *pixel = *pixel_start_ptr;
-	uint32_t dev_addr  = *device_address_ptr;
-	uint8_t *cmd = *command_buffer_ptr;
-	const int bpp = 2;
-
-	while ((pixel_end > pixel) &&
-	       (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) {
-		uint8_t *raw_pixels_count_byte = 0;
-		uint8_t *cmd_pixels_count_byte = 0;
-		const uint16_t *raw_pixel_start = 0;
-		const uint16_t *cmd_pixel_start, *cmd_pixel_end = 0;
-
-		prefetchw((void *) cmd); /* pull in one cache line at least */
-
-		*cmd++ = 0xAF;
-		*cmd++ = 0x6B;
-		*cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF);
-		*cmd++ = (uint8_t) ((dev_addr >> 8) & 0xFF);
-		*cmd++ = (uint8_t) ((dev_addr) & 0xFF);
-
-		cmd_pixels_count_byte = cmd++; /*  we'll know this later */
-		cmd_pixel_start = pixel;
-
-		raw_pixels_count_byte = cmd++; /*  we'll know this later */
-		raw_pixel_start = pixel;
-
-		cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1,
-			min((int)(pixel_end - pixel),
-			    (int)(cmd_buffer_end - cmd) / bpp));
-
-		prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp);
-
-		while (pixel < cmd_pixel_end) {
-			const uint16_t * const repeating_pixel = pixel;
-
-			*(uint16_t *)cmd = cpu_to_be16p(pixel);
-			cmd += 2;
-			pixel++;
-
-			if (unlikely((pixel < cmd_pixel_end) &&
-				     (*pixel == *repeating_pixel))) {
-				/* go back and fill in raw pixel count */
-				*raw_pixels_count_byte = ((repeating_pixel -
-						raw_pixel_start) + 1) & 0xFF;
-
-				while ((pixel < cmd_pixel_end)
-				       && (*pixel == *repeating_pixel)) {
-					pixel++;
-				}
-
-				/* immediately after raw data is repeat byte */
-				*cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF;
-
-				/* Then start another raw pixel span */
-				raw_pixel_start = pixel;
-				raw_pixels_count_byte = cmd++;
-			}
-		}
-
-		if (pixel > raw_pixel_start) {
-			/* finalize last RAW span */
-			*raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF;
-		}
-
-		*cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF;
-		dev_addr += (pixel - cmd_pixel_start) * bpp;
-	}
-
-	if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) {
-		/* Fill leftover bytes with no-ops */
-		if (cmd_buffer_end > cmd)
-			memset(cmd, 0xAF, cmd_buffer_end - cmd);
-		cmd = (uint8_t *) cmd_buffer_end;
-	}
-
-	*command_buffer_ptr = cmd;
-	*pixel_start_ptr = pixel;
-	*device_address_ptr = dev_addr;
-
-	return;
-}
-
-/*
- * There are 3 copies of every pixel: The front buffer that the fbdev
- * client renders to, the actual framebuffer across the USB bus in hardware
- * (that we can only write to, slowly, and can never read), and (optionally)
- * our shadow copy that tracks what's been sent to that hardware buffer.
- */
-static int dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr,
-			      const char *front, char **urb_buf_ptr,
-			      u32 byte_offset, u32 byte_width,
-			      int *ident_ptr, int *sent_ptr)
-{
-	const u8 *line_start, *line_end, *next_pixel;
-	u32 dev_addr = dev->base16 + byte_offset;
-	struct urb *urb = *urb_ptr;
-	u8 *cmd = *urb_buf_ptr;
-	u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length;
-
-	line_start = (u8 *) (front + byte_offset);
-	next_pixel = line_start;
-	line_end = next_pixel + byte_width;
-
-	if (dev->backing_buffer) {
-		int offset;
-		const u8 *back_start = (u8 *) (dev->backing_buffer
-						+ byte_offset);
-
-		*ident_ptr += dlfb_trim_hline(back_start, &next_pixel,
-			&byte_width);
-
-		offset = next_pixel - line_start;
-		line_end = next_pixel + byte_width;
-		dev_addr += offset;
-		back_start += offset;
-		line_start += offset;
-
-		memcpy((char *)back_start, (char *) line_start,
-		       byte_width);
-	}
-
-	while (next_pixel < line_end) {
-
-		dlfb_compress_hline((const uint16_t **) &next_pixel,
-			     (const uint16_t *) line_end, &dev_addr,
-			(u8 **) &cmd, (u8 *) cmd_end);
-
-		if (cmd >= cmd_end) {
-			int len = cmd - (u8 *) urb->transfer_buffer;
-			if (dlfb_submit_urb(dev, urb, len))
-				return 1; /* lost pixels is set */
-			*sent_ptr += len;
-			urb = dlfb_get_urb(dev);
-			if (!urb)
-				return 1; /* lost_pixels is set */
-			*urb_ptr = urb;
-			cmd = urb->transfer_buffer;
-			cmd_end = &cmd[urb->transfer_buffer_length];
-		}
-	}
-
-	*urb_buf_ptr = cmd;
-
-	return 0;
-}
-
-int dlfb_handle_damage(struct dlfb_data *dev, int x, int y,
-	       int width, int height, char *data)
-{
-	int i, ret;
-	char *cmd;
-	cycles_t start_cycles, end_cycles;
-	int bytes_sent = 0;
-	int bytes_identical = 0;
-	struct urb *urb;
-	int aligned_x;
-
-	start_cycles = get_cycles();
-
-	aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
-	width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
-	x = aligned_x;
-
-	if ((width <= 0) ||
-	    (x + width > dev->info->var.xres) ||
-	    (y + height > dev->info->var.yres))
-		return -EINVAL;
-
-	if (!atomic_read(&dev->usb_active))
-		return 0;
-
-	urb = dlfb_get_urb(dev);
-	if (!urb)
-		return 0;
-	cmd = urb->transfer_buffer;
-
-	for (i = y; i < y + height ; i++) {
-		const int line_offset = dev->info->fix.line_length * i;
-		const int byte_offset = line_offset + (x * BPP);
-
-		if (dlfb_render_hline(dev, &urb,
-				      (char *) dev->info->fix.smem_start,
-				      &cmd, byte_offset, width * BPP,
-				      &bytes_identical, &bytes_sent))
-			goto error;
-	}
-
-	if (cmd > (char *) urb->transfer_buffer) {
-		/* Send partial buffer remaining before exiting */
-		int len = cmd - (char *) urb->transfer_buffer;
-		ret = dlfb_submit_urb(dev, urb, len);
-		bytes_sent += len;
-	} else
-		dlfb_urb_completion(urb);
-
-error:
-	atomic_add(bytes_sent, &dev->bytes_sent);
-	atomic_add(bytes_identical, &dev->bytes_identical);
-	atomic_add(width*height*2, &dev->bytes_rendered);
-	end_cycles = get_cycles();
-	atomic_add(((unsigned int) ((end_cycles - start_cycles)
-		    >> 10)), /* Kcycles */
-		   &dev->cpu_kcycles_used);
-
-	return 0;
-}
-
-static ssize_t dlfb_ops_read(struct fb_info *info, char __user *buf,
-			 size_t count, loff_t *ppos)
-{
-	ssize_t result = -ENOSYS;
-
-#if defined CONFIG_FB_SYS_FOPS || defined CONFIG_FB_SYS_FOPS_MODULE
-	result = fb_sys_read(info, buf, count, ppos);
-#endif
-
-	return result;
-}
-
-/*
- * Path triggered by usermode clients who write to filesystem
- * e.g. cat filename > /dev/fb1
- * Not used by X Windows or text-mode console. But useful for testing.
- * Slow because of extra copy and we must assume all pixels dirty.
- */
-static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf,
-			  size_t count, loff_t *ppos)
-{
-	ssize_t result = -ENOSYS;
-	struct dlfb_data *dev = info->par;
-	u32 offset = (u32) *ppos;
-
-#if defined CONFIG_FB_SYS_FOPS || defined CONFIG_FB_SYS_FOPS_MODULE
-
-	result = fb_sys_write(info, buf, count, ppos);
-
-	if (result > 0) {
-		int start = max((int)(offset / info->fix.line_length) - 1, 0);
-		int lines = min((u32)((result / info->fix.line_length) + 1),
-				(u32)info->var.yres);
-
-		dlfb_handle_damage(dev, 0, start, info->var.xres,
-			lines, info->screen_base);
-	}
-#endif
-
-	return result;
-}
-
-/* hardware has native COPY command (see libdlo), but not worth it for fbcon */
-static void dlfb_ops_copyarea(struct fb_info *info,
-				const struct fb_copyarea *area)
-{
-
-	struct dlfb_data *dev = info->par;
-
-#if defined CONFIG_FB_SYS_COPYAREA || defined CONFIG_FB_SYS_COPYAREA_MODULE
-
-	sys_copyarea(info, area);
-
-	dlfb_handle_damage(dev, area->dx, area->dy,
-			area->width, area->height, info->screen_base);
-#endif
-
-}
-
-static void dlfb_ops_imageblit(struct fb_info *info,
-				const struct fb_image *image)
-{
-	struct dlfb_data *dev = info->par;
-
-#if defined CONFIG_FB_SYS_IMAGEBLIT || defined CONFIG_FB_SYS_IMAGEBLIT_MODULE
-
-	sys_imageblit(info, image);
-
-	dlfb_handle_damage(dev, image->dx, image->dy,
-			image->width, image->height, info->screen_base);
-
-#endif
-
-}
-
-static void dlfb_ops_fillrect(struct fb_info *info,
-			  const struct fb_fillrect *rect)
-{
-	struct dlfb_data *dev = info->par;
-
-#if defined CONFIG_FB_SYS_FILLRECT || defined CONFIG_FB_SYS_FILLRECT_MODULE
-
-	sys_fillrect(info, rect);
-
-	dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width,
-			      rect->height, info->screen_base);
-#endif
-
-}
-
-#ifdef CONFIG_FB_DEFERRED_IO
-/*
- * NOTE: fb_defio.c is holding info->fbdefio.mutex
- *   Touching ANY framebuffer memory that triggers a page fault
- *   in fb_defio will cause a deadlock, when it also tries to
- *   grab the same mutex.
- */
-static void dlfb_dpy_deferred_io(struct fb_info *info,
-				struct list_head *pagelist)
-{
-	struct page *cur;
-	struct fb_deferred_io *fbdefio = info->fbdefio;
-	struct dlfb_data *dev = info->par;
-	struct urb *urb;
-	char *cmd;
-	cycles_t start_cycles, end_cycles;
-	int bytes_sent = 0;
-	int bytes_identical = 0;
-	int bytes_rendered = 0;
-
-	if (!fb_defio)
-		return;
-
-	if (!atomic_read(&dev->usb_active))
-		return;
-
-	start_cycles = get_cycles();
-
-	urb = dlfb_get_urb(dev);
-	if (!urb)
-		return;
-
-	cmd = urb->transfer_buffer;
-
-	/* walk the written page list and render each to device */
-	list_for_each_entry(cur, &fbdefio->pagelist, lru) {
-
-		if (dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start,
-				  &cmd, cur->index << PAGE_SHIFT,
-				  PAGE_SIZE, &bytes_identical, &bytes_sent))
-			goto error;
-		bytes_rendered += PAGE_SIZE;
-	}
-
-	if (cmd > (char *) urb->transfer_buffer) {
-		/* Send partial buffer remaining before exiting */
-		int len = cmd - (char *) urb->transfer_buffer;
-		dlfb_submit_urb(dev, urb, len);
-		bytes_sent += len;
-	} else
-		dlfb_urb_completion(urb);
-
-error:
-	atomic_add(bytes_sent, &dev->bytes_sent);
-	atomic_add(bytes_identical, &dev->bytes_identical);
-	atomic_add(bytes_rendered, &dev->bytes_rendered);
-	end_cycles = get_cycles();
-	atomic_add(((unsigned int) ((end_cycles - start_cycles)
-		    >> 10)), /* Kcycles */
-		   &dev->cpu_kcycles_used);
-}
-
-#endif
-
-static int dlfb_get_edid(struct dlfb_data *dev, char *edid, int len)
-{
-	int i;
-	int ret;
-	char *rbuf;
-
-	rbuf = kmalloc(2, GFP_KERNEL);
-	if (!rbuf)
-		return 0;
-
-	for (i = 0; i < len; i++) {
-		ret = usb_control_msg(dev->udev,
-				    usb_rcvctrlpipe(dev->udev, 0), (0x02),
-				    (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
-				    HZ);
-		if (ret < 1) {
-			dl_err("Read EDID byte %d failed err %x\n", i, ret);
-			i--;
-			break;
-		}
-		edid[i] = rbuf[1];
-	}
-
-	kfree(rbuf);
-
-	return i;
-}
-
-static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd,
-				unsigned long arg)
-{
-
-	struct dlfb_data *dev = info->par;
-	struct dloarea *area = NULL;
-
-	if (!atomic_read(&dev->usb_active))
-		return 0;
-
-	/* TODO: Update X server to get this from sysfs instead */
-	if (cmd == DLFB_IOCTL_RETURN_EDID) {
-		char *edid = (char *)arg;
-		if (copy_to_user(edid, dev->edid, dev->edid_size))
-			return -EFAULT;
-		return 0;
-	}
-
-	/* TODO: Help propose a standard fb.h ioctl to report mmap damage */
-	if (cmd == DLFB_IOCTL_REPORT_DAMAGE) {
-
-		/*
-		 * If we have a damage-aware client, turn fb_defio "off"
-		 * To avoid perf imact of unecessary page fault handling.
-		 * Done by resetting the delay for this fb_info to a very
-		 * long period. Pages will become writable and stay that way.
-		 * Reset to normal value when all clients have closed this fb.
-		 */
-		if (info->fbdefio)
-			info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE;
-
-		area = (struct dloarea *)arg;
-
-		if (area->x < 0)
-			area->x = 0;
-
-		if (area->x > info->var.xres)
-			area->x = info->var.xres;
-
-		if (area->y < 0)
-			area->y = 0;
-
-		if (area->y > info->var.yres)
-			area->y = info->var.yres;
-
-		dlfb_handle_damage(dev, area->x, area->y, area->w, area->h,
-			   info->screen_base);
-	}
-
-	return 0;
-}
-
-/* taken from vesafb */
-static int
-dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
-	       unsigned blue, unsigned transp, struct fb_info *info)
-{
-	int err = 0;
-
-	if (regno >= info->cmap.len)
-		return 1;
-
-	if (regno < 16) {
-		if (info->var.red.offset == 10) {
-			/* 1:5:5:5 */
-			((u32 *) (info->pseudo_palette))[regno] =
-			    ((red & 0xf800) >> 1) |
-			    ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
-		} else {
-			/* 0:5:6:5 */
-			((u32 *) (info->pseudo_palette))[regno] =
-			    ((red & 0xf800)) |
-			    ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
-		}
-	}
-
-	return err;
-}
-
-/*
- * It's common for several clients to have framebuffer open simultaneously.
- * e.g. both fbcon and X. Makes things interesting.
- * Assumes caller is holding info->lock (for open and release at least)
- */
-static int dlfb_ops_open(struct fb_info *info, int user)
-{
-	struct dlfb_data *dev = info->par;
-
-	/*
-	 * fbcon aggressively connects to first framebuffer it finds,
-	 * preventing other clients (X) from working properly. Usually
-	 * not what the user wants. Fail by default with option to enable.
-	 */
-	if ((user == 0) & (!console))
-		return -EBUSY;
-
-	/* If the USB device is gone, we don't accept new opens */
-	if (dev->virtualized)
-		return -ENODEV;
-
-	dev->fb_count++;
-
-	kref_get(&dev->kref);
-
-#ifdef CONFIG_FB_DEFERRED_IO
-	if (fb_defio && (info->fbdefio == NULL)) {
-		/* enable defio at last moment if not disabled by client */
-
-		struct fb_deferred_io *fbdefio;
-
-		fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
-
-		if (fbdefio) {
-			fbdefio->delay = DL_DEFIO_WRITE_DELAY;
-			fbdefio->deferred_io = dlfb_dpy_deferred_io;
-		}
-
-		info->fbdefio = fbdefio;
-		fb_deferred_io_init(info);
-	}
-#endif
-
-	dl_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
-	    info->node, user, info, dev->fb_count);
-
-	return 0;
-}
-
-/*
- * Called when all client interfaces to start transactions have been disabled,
- * and all references to our device instance (dlfb_data) are released.
- * Every transaction must have a reference, so we know are fully spun down
- */
-static void dlfb_free(struct kref *kref)
-{
-	struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref);
-
-	/* this function will wait for all in-flight urbs to complete */
-	if (dev->urbs.count > 0)
-		dlfb_free_urb_list(dev);
-
-	if (dev->backing_buffer)
-		vfree(dev->backing_buffer);
-
-	kfree(dev->edid);
-
-	dl_warn("freeing dlfb_data %p\n", dev);
-
-	kfree(dev);
-}
-
-static void dlfb_release_urb_work(struct work_struct *work)
-{
-	struct urb_node *unode = container_of(work, struct urb_node,
-					      release_urb_work.work);
-
-	up(&unode->dev->urbs.limit_sem);
-}
-
-static void dlfb_free_framebuffer_work(struct work_struct *work)
-{
-	struct dlfb_data *dev = container_of(work, struct dlfb_data,
-					     free_framebuffer_work.work);
-	struct fb_info *info = dev->info;
-	int node = info->node;
-
-	unregister_framebuffer(info);
-
-	if (info->cmap.len != 0)
-		fb_dealloc_cmap(&info->cmap);
-	if (info->monspecs.modedb)
-		fb_destroy_modedb(info->monspecs.modedb);
-	if (info->screen_base)
-		vfree(info->screen_base);
-
-	fb_destroy_modelist(&info->modelist);
-
-	dev->info = 0;
-
-	/* Assume info structure is freed after this point */
-	framebuffer_release(info);
-
-	dl_warn("fb_info for /dev/fb%d has been freed\n", node);
-
-	/* ref taken in probe() as part of registering framebfufer */
-	kref_put(&dev->kref, dlfb_free);
-}
-
-/*
- * Assumes caller is holding info->lock mutex (for open and release at least)
- */
-static int dlfb_ops_release(struct fb_info *info, int user)
-{
-	struct dlfb_data *dev = info->par;
-
-	dev->fb_count--;
-
-	/* We can't free fb_info here - fbmem will touch it when we return */
-	if (dev->virtualized && (dev->fb_count == 0))
-		schedule_delayed_work(&dev->free_framebuffer_work, HZ);
-
-#ifdef CONFIG_FB_DEFERRED_IO
-	if ((dev->fb_count == 0) && (info->fbdefio)) {
-		fb_deferred_io_cleanup(info);
-		kfree(info->fbdefio);
-		info->fbdefio = NULL;
-		info->fbops->fb_mmap = dlfb_ops_mmap;
-	}
-#endif
-
-	dl_warn("released /dev/fb%d user=%d count=%d\n",
-		  info->node, user, dev->fb_count);
-
-	kref_put(&dev->kref, dlfb_free);
-
-	return 0;
-}
-
-/*
- * Check whether a video mode is supported by the DisplayLink chip
- * We start from monitor's modes, so don't need to filter that here
- */
-static int dlfb_is_valid_mode(struct fb_videomode *mode,
-		struct fb_info *info)
-{
-	struct dlfb_data *dev = info->par;
-
-	if (mode->xres * mode->yres > dev->sku_pixel_limit) {
-		dl_warn("%dx%d beyond chip capabilities\n",
-		       mode->xres, mode->yres);
-		return 0;
-	}
-
-	dl_info("%dx%d valid mode\n", mode->xres, mode->yres);
-
-	return 1;
-}
-
-static void dlfb_var_color_format(struct fb_var_screeninfo *var)
-{
-	const struct fb_bitfield red = { 11, 5, 0 };
-	const struct fb_bitfield green = { 5, 6, 0 };
-	const struct fb_bitfield blue = { 0, 5, 0 };