Udlfb has been superseded by DRM's udl. The DRM driver is better by any means and actively maintained. Remove udlfb.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de --- CREDITS | 5 + Documentation/fb/index.rst | 1 - Documentation/fb/udlfb.rst | 162 --- MAINTAINERS | 9 - drivers/video/fbdev/Kconfig | 17 +- drivers/video/fbdev/Makefile | 1 - drivers/video/fbdev/udlfb.c | 1994 ---------------------------------- 7 files changed, 6 insertions(+), 2183 deletions(-) delete mode 100644 Documentation/fb/udlfb.rst delete mode 100644 drivers/video/fbdev/udlfb.c
diff --git a/CREDITS b/CREDITS index 748301954ab7..fed3518c4dd8 100644 --- a/CREDITS +++ b/CREDITS @@ -3620,6 +3620,11 @@ S: 145 Howard St. S: Northborough, MA 01532 S: USA
+N: Bernie Thompson +E: bernie@plugable.com +W: http://plugable.com/category/projects/udlfb/ +D: DisplayLink USB 2.0 framebuffer driver + N: Doug Thompson E: dougthompson@xmission.com D: EDAC diff --git a/Documentation/fb/index.rst b/Documentation/fb/index.rst index baf02393d8ee..8136c84328e2 100644 --- a/Documentation/fb/index.rst +++ b/Documentation/fb/index.rst @@ -36,7 +36,6 @@ Frame Buffer sstfb tgafb tridentfb - udlfb uvesafb vesafb viafb diff --git a/Documentation/fb/udlfb.rst b/Documentation/fb/udlfb.rst deleted file mode 100644 index 732b37db3504..000000000000 --- a/Documentation/fb/udlfb.rst +++ /dev/null @@ -1,162 +0,0 @@ -============== -What is udlfb? -============== - -This is a driver for DisplayLink USB 2.0 era graphics chips. - -DisplayLink chips provide simple hline/blit operations with some compression, -pairing that with a hardware framebuffer (16MB) on the other end of the -USB wire. That hardware framebuffer is able to drive the VGA, DVI, or HDMI -monitor with no CPU involvement until a pixel has to change. - -The CPU or other local resource does all the rendering; optionally compares the -result with a local shadow of the remote hardware framebuffer to identify -the minimal set of pixels that have changed; and compresses and sends those -pixels line-by-line via USB bulk transfers. - -Because of the efficiency of bulk transfers and a protocol on top that -does not require any acks - the effect is very low latency that -can support surprisingly high resolutions with good performance for -non-gaming and non-video applications. - -Mode setting, EDID read, etc are other bulk or control transfers. Mode -setting is very flexible - able to set nearly arbitrary modes from any timing. - -Advantages of USB graphics in general: - - * Ability to add a nearly arbitrary number of displays to any USB 2.0 - capable system. On Linux, number of displays is limited by fbdev interface - (FB_MAX is currently 32). Of course, all USB devices on the same - host controller share the same 480Mbs USB 2.0 interface. - -Advantages of supporting DisplayLink chips with kernel framebuffer interface: - - * The actual hardware functionality of DisplayLink chips matches nearly - one-to-one with the fbdev interface, making the driver quite small and - tight relative to the functionality it provides. - * X servers and other applications can use the standard fbdev interface - from user mode to talk to the device, without needing to know anything - about USB or DisplayLink's protocol at all. A "displaylink" X driver - and a slightly modified "fbdev" X driver are among those that already do. - -Disadvantages: - - * Fbdev's mmap interface assumes a real hardware framebuffer is mapped. - In the case of USB graphics, it is just an allocated (virtual) buffer. - Writes need to be detected and encoded into USB bulk transfers by the CPU. - Accurate damage/changed area notifications work around this problem. - In the future, hopefully fbdev will be enhanced with an small standard - interface to allow mmap clients to report damage, for the benefit - of virtual or remote framebuffers. - * Fbdev does not arbitrate client ownership of the framebuffer well. - * Fbcon assumes the first framebuffer it finds should be consumed for console. - * It's not clear what the future of fbdev is, given the rise of KMS/DRM. - -How to use it? -============== - -Udlfb, when loaded as a module, will match against all USB 2.0 generation -DisplayLink chips (Alex and Ollie family). It will then attempt to read the EDID -of the monitor, and set the best common mode between the DisplayLink device -and the monitor's capabilities. - -If the DisplayLink device is successful, it will paint a "green screen" which -means that from a hardware and fbdev software perspective, everything is good. - -At that point, a /dev/fb? interface will be present for user-mode applications -to open and begin writing to the framebuffer of the DisplayLink device using -standard fbdev calls. Note that if mmap() is used, by default the user mode -application must send down damage notifications to trigger repaints of the -changed regions. Alternatively, udlfb can be recompiled with experimental -defio support enabled, to support a page-fault based detection mechanism -that can work without explicit notification. - -The most common client of udlfb is xf86-video-displaylink or a modified -xf86-video-fbdev X server. These servers have no real DisplayLink specific -code. They write to the standard framebuffer interface and rely on udlfb -to do its thing. The one extra feature they have is the ability to report -rectangles from the X DAMAGE protocol extension down to udlfb via udlfb's -damage interface (which will hopefully be standardized for all virtual -framebuffers that need damage info). These damage notifications allow -udlfb to efficiently process the changed pixels. - -Module Options -============== - -Special configuration for udlfb is usually unnecessary. There are a few -options, however. - -From the command line, pass options to modprobe -modprobe udlfb fb_defio=0 console=1 shadow=1 - -Or modify options on the fly at /sys/module/udlfb/parameters directory via -sudo nano fb_defio -change the parameter in place, and save the file. - -Unplug/replug USB device to apply with new settings - -Or for permanent option, create file like /etc/modprobe.d/udlfb.conf with text -options udlfb fb_defio=0 console=1 shadow=1 - -Accepted boolean options: - -=============== ================================================================ -fb_defio Make use of the fb_defio (CONFIG_FB_DEFERRED_IO) kernel - module to track changed areas of the framebuffer by page faults. - Standard fbdev applications that use mmap but that do not - report damage, should be able to work with this enabled. - Disable when running with X server that supports reporting - changed regions via ioctl, as this method is simpler, - more stable, and higher performance. - default: fb_defio=1 - -console Allow fbcon to attach to udlfb provided framebuffers. - Can be disabled if fbcon and other clients - (e.g. X with --shared-vt) are in conflict. - default: console=1 - -shadow Allocate a 2nd framebuffer to shadow what's currently across - the USB bus in device memory. If any pixels are unchanged, - do not transmit. Spends host memory to save USB transfers. - Enabled by default. Only disable on very low memory systems. - default: shadow=1 -=============== ================================================================ - -Sysfs Attributes -================ - -Udlfb creates several files in /sys/class/graphics/fb? -Where ? is the sequential framebuffer id of the particular DisplayLink device - -======================== ======================================================== -edid If a valid EDID blob is written to this file (typically - by a udev rule), then udlfb will use this EDID as a - backup in case reading the actual EDID of the monitor - attached to the DisplayLink device fails. This is - especially useful for fixed panels, etc. that cannot - communicate their capabilities via EDID. Reading - this file returns the current EDID of the attached - monitor (or last backup value written). This is - useful to get the EDID of the attached monitor, - which can be passed to utilities like parse-edid. - -metrics_bytes_rendered 32-bit count of pixel bytes rendered - -metrics_bytes_identical 32-bit count of how many of those bytes were found to be - unchanged, based on a shadow framebuffer check - -metrics_bytes_sent 32-bit count of how many bytes were transferred over - USB to communicate the resulting changed pixels to the - hardware. Includes compression and protocol overhead - -metrics_cpu_kcycles_used 32-bit count of CPU cycles used in processing the - above pixels (in thousands of cycles). - -metrics_reset Write-only. Any write to this file resets all metrics - above to zero. Note that the 32-bit counters above - roll over very quickly. To get reliable results, design - performance tests to start and finish in a very short - period of time (one minute or less is safe). -======================== ======================================================== - -Bernie Thompson bernie@plugable.com diff --git a/MAINTAINERS b/MAINTAINERS index c5a399541d6a..2b445f87e1ef 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5178,15 +5178,6 @@ F: fs/quota/ F: include/linux/quota*.h F: include/uapi/linux/quota*.h
-DISPLAYLINK USB 2.0 FRAMEBUFFER DRIVER (UDLFB) -M: Bernie Thompson bernie@plugable.com -L: linux-fbdev@vger.kernel.org -S: Maintained -W: http://plugable.com/category/projects/udlfb/ -F: Documentation/fb/udlfb.rst -F: drivers/video/fbdev/udlfb.c -F: include/video/udlfb.h - DISTRIBUTED LOCK MANAGER (DLM) M: Christine Caulfield ccaulfie@redhat.com M: David Teigland teigland@redhat.com diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig index 4f02db65dede..41189b31c5d6 100644 --- a/drivers/video/fbdev/Kconfig +++ b/drivers/video/fbdev/Kconfig @@ -558,7 +558,7 @@ config FB_STI BIOS routines contained in a ROM chip in HP PA-RISC based machines. Enabling this option will implement the linux framebuffer device using calls to the STI BIOS routines for initialisation. - + If you enable this option, you will get a planar framebuffer device /dev/fb which will work on the most common HP graphic cards of the NGLE family, including the artist chips (in the 7xx and Bxxx series), @@ -1939,21 +1939,6 @@ config FB_SMSCUFX (USB 3.0) devices. To compile as a module, choose M here: the module name is smscufx.
-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. - config FB_IBM_GXT4500 tristate "Framebuffer support for IBM GXT4000P/4500P/6000P/6500P adaptors" depends on FB diff --git a/drivers/video/fbdev/Makefile b/drivers/video/fbdev/Makefile index 477b9624b703..49b5dd0bef02 100644 --- a/drivers/video/fbdev/Makefile +++ b/drivers/video/fbdev/Makefile @@ -106,7 +106,6 @@ obj-$(CONFIG_FB_COBALT) += cobalt_lcdfb.o obj-$(CONFIG_FB_IBM_GXT4500) += gxt4500.o obj-$(CONFIG_FB_PS3) += ps3fb.o obj-$(CONFIG_FB_SM501) += sm501fb.o -obj-$(CONFIG_FB_UDL) += udlfb.o obj-$(CONFIG_FB_SMSCUFX) += smscufx.o obj-$(CONFIG_FB_XILINX) += xilinxfb.o obj-$(CONFIG_FB_SH_MOBILE_LCDC) += sh_mobile_lcdcfb.o diff --git a/drivers/video/fbdev/udlfb.c b/drivers/video/fbdev/udlfb.c deleted file mode 100644 index f9b3c1cb9530..000000000000 --- a/drivers/video/fbdev/udlfb.c +++ /dev/null @@ -1,1994 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * 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 - * - * 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 <asm/unaligned.h> -#include <video/udlfb.h> -#include "edid.h" - -static const 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 | - FBINFO_VIRTFB | - FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | - FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; - -/* - * There are many DisplayLink-based graphics products, all with unique PIDs. - * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) - * We also require a match on SubClass (0x00) and Protocol (0x00), - * which is compatible with all known USB 2.0 era graphics chips and firmware, - * but allows DisplayLink to increment those for any future incompatible chips - */ -static const struct usb_device_id id_table[] = { - {.idVendor = 0x17e9, - .bInterfaceClass = 0xff, - .bInterfaceSubClass = 0x00, - .bInterfaceProtocol = 0x00, - .match_flags = USB_DEVICE_ID_MATCH_VENDOR | - USB_DEVICE_ID_MATCH_INT_CLASS | - USB_DEVICE_ID_MATCH_INT_SUBCLASS | - USB_DEVICE_ID_MATCH_INT_PROTOCOL, - }, - {}, -}; -MODULE_DEVICE_TABLE(usb, id_table); - -/* module options */ -static bool console = true; /* Allow fbcon to open framebuffer */ -static bool fb_defio = true; /* Detect mmap writes using page faults */ -static bool shadow = true; /* Optionally disable shadow framebuffer */ -static int pixel_limit; /* Optionally force a pixel resolution limit */ - -struct dlfb_deferred_free { - struct list_head list; - void *mem; -}; - -static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len); - -/* 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 *dlfb); -static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb * urb, size_t len); -static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size); -static void dlfb_free_urb_list(struct dlfb_data *dlfb); - -/* - * 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); -} - -/* - * Map FB_BLANK_* to DisplayLink register - * DLReg FB_BLANK_* - * ----- ----------------------------- - * 0x00 FB_BLANK_UNBLANK (0) - * 0x01 FB_BLANK (1) - * 0x03 FB_BLANK_VSYNC_SUSPEND (2) - * 0x05 FB_BLANK_HSYNC_SUSPEND (3) - * 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back - */ -static char *dlfb_blanking(char *buf, int fb_blank) -{ - u8 reg; - - switch (fb_blank) { - case FB_BLANK_POWERDOWN: - reg = 0x07; - break; - case FB_BLANK_HSYNC_SUSPEND: - reg = 0x05; - break; - case FB_BLANK_VSYNC_SUSPEND: - reg = 0x03; - break; - case FB_BLANK_NORMAL: - reg = 0x01; - break; - default: - reg = 0x00; - } - - buf = dlfb_set_register(buf, 0x1F, reg); - - return buf; -} - -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 *dlfb, - struct fb_var_screeninfo *var) -{ - char *buf; - char *wrptr; - int retval; - int writesize; - struct urb *urb; - - if (!atomic_read(&dlfb->usb_active)) - return -EPERM; - - urb = dlfb_get_urb(dlfb); - 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, dlfb->info->fix.smem_len); - - wrptr = dlfb_set_vid_cmds(wrptr, var); - wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK); - wrptr = dlfb_vidreg_unlock(wrptr); - - writesize = wrptr - buf; - - retval = dlfb_submit_urb(dlfb, urb, writesize); - - dlfb->blank_mode = FB_BLANK_UNBLANK; - - 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 (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) - return -EINVAL; - if (size > info->fix.smem_len) - return -EINVAL; - if (offset > info->fix.smem_len - size) - return -EINVAL; - - pos = (unsigned long)info->fix.smem_start + offset; - - dev_dbg(info->dev, "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; - } - - 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; - - 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, - unsigned long back_buffer_offset, - int *ident_ptr) -{ - const uint16_t *pixel = *pixel_start_ptr; - uint32_t dev_addr = *device_address_ptr; - uint8_t *cmd = *command_buffer_ptr; - - while ((pixel_end > pixel) && - (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { - uint8_t *raw_pixels_count_byte = NULL; - uint8_t *cmd_pixels_count_byte = NULL; - const uint16_t *raw_pixel_start = NULL; - const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL; - - if (back_buffer_offset && - *pixel == *(u16 *)((u8 *)pixel + back_buffer_offset)) { - pixel++; - dev_addr += BPP; - (*ident_ptr)++; - continue; - } - - *cmd++ = 0xAF; - *cmd++ = 0x6B; - *cmd++ = dev_addr >> 16; - *cmd++ = dev_addr >> 8; - *cmd++ = dev_addr; - - 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 + min3(MAX_CMD_PIXELS + 1UL, - (unsigned long)(pixel_end - pixel), - (unsigned long)(cmd_buffer_end - 1 - cmd) / BPP); - - if (back_buffer_offset) { - /* note: the framebuffer may change under us, so we must test for underflow */ - while (cmd_pixel_end - 1 > pixel && - *(cmd_pixel_end - 1) == *(u16 *)((u8 *)(cmd_pixel_end - 1) + back_buffer_offset)) - cmd_pixel_end--; - } - - while (pixel < cmd_pixel_end) { - const uint16_t * const repeating_pixel = pixel; - u16 pixel_value = *pixel; - - put_unaligned_be16(pixel_value, cmd); - if (back_buffer_offset) - *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; - cmd += 2; - pixel++; - - if (unlikely((pixel < cmd_pixel_end) && - (*pixel == pixel_value))) { - /* go back and fill in raw pixel count */ - *raw_pixels_count_byte = ((repeating_pixel - - raw_pixel_start) + 1) & 0xFF; - - do { - if (back_buffer_offset) - *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; - pixel++; - } while ((pixel < cmd_pixel_end) && - (*pixel == pixel_value)); - - /* 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; - } else { - /* undo unused byte */ - cmd--; - } - - *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; - dev_addr += (u8 *)pixel - (u8 *)cmd_pixel_start; - } - - 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; -} - -/* - * 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 *dlfb, 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 = dlfb->base16 + byte_offset; - struct urb *urb = *urb_ptr; - u8 *cmd = *urb_buf_ptr; - u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; - unsigned long back_buffer_offset = 0; - - line_start = (u8 *) (front + byte_offset); - next_pixel = line_start; - line_end = next_pixel + byte_width; - - if (dlfb->backing_buffer) { - int offset; - const u8 *back_start = (u8 *) (dlfb->backing_buffer - + byte_offset); - - back_buffer_offset = (unsigned long)back_start - (unsigned long)line_start; - - *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; - } - - 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, back_buffer_offset, - ident_ptr); - - if (cmd >= cmd_end) { - int len = cmd - (u8 *) urb->transfer_buffer; - if (dlfb_submit_urb(dlfb, urb, len)) - return 1; /* lost pixels is set */ - *sent_ptr += len; - urb = dlfb_get_urb(dlfb); - 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; -} - -static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, int width, int height) -{ - 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(); - - mutex_lock(&dlfb->render_mutex); - - 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 > dlfb->info->var.xres) || - (y + height > dlfb->info->var.yres)) { - ret = -EINVAL; - goto unlock_ret; - } - - if (!atomic_read(&dlfb->usb_active)) { - ret = 0; - goto unlock_ret; - } - - urb = dlfb_get_urb(dlfb); - if (!urb) { - ret = 0; - goto unlock_ret; - } - cmd = urb->transfer_buffer; - - for (i = y; i < y + height ; i++) { - const int line_offset = dlfb->info->fix.line_length * i; - const int byte_offset = line_offset + (x * BPP); - - if (dlfb_render_hline(dlfb, &urb, - (char *) dlfb->info->fix.smem_start, - &cmd, byte_offset, width * BPP, - &bytes_identical, &bytes_sent)) - goto error; - } - - if (cmd > (char *) urb->transfer_buffer) { - int len; - if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) - *cmd++ = 0xAF; - /* Send partial buffer remaining before exiting */ - len = cmd - (char *) urb->transfer_buffer; - dlfb_submit_urb(dlfb, urb, len); - bytes_sent += len; - } else - dlfb_urb_completion(urb); - -error: - atomic_add(bytes_sent, &dlfb->bytes_sent); - atomic_add(bytes_identical, &dlfb->bytes_identical); - atomic_add(width*height*2, &dlfb->bytes_rendered); - end_cycles = get_cycles(); - atomic_add(((unsigned int) ((end_cycles - start_cycles) - >> 10)), /* Kcycles */ - &dlfb->cpu_kcycles_used); - - ret = 0; - -unlock_ret: - mutex_unlock(&dlfb->render_mutex); - return ret; -} - -static void dlfb_init_damage(struct dlfb_data *dlfb) -{ - dlfb->damage_x = INT_MAX; - dlfb->damage_x2 = 0; - dlfb->damage_y = INT_MAX; - dlfb->damage_y2 = 0; -} - -static void dlfb_damage_work(struct work_struct *w) -{ - struct dlfb_data *dlfb = container_of(w, struct dlfb_data, damage_work); - int x, x2, y, y2; - - spin_lock_irq(&dlfb->damage_lock); - x = dlfb->damage_x; - x2 = dlfb->damage_x2; - y = dlfb->damage_y; - y2 = dlfb->damage_y2; - dlfb_init_damage(dlfb); - spin_unlock_irq(&dlfb->damage_lock); - - if (x < x2 && y < y2) - dlfb_handle_damage(dlfb, x, y, x2 - x, y2 - y); -} - -static void dlfb_offload_damage(struct dlfb_data *dlfb, int x, int y, int width, int height) -{ - unsigned long flags; - int x2 = x + width; - int y2 = y + height; - - if (x >= x2 || y >= y2) - return; - - spin_lock_irqsave(&dlfb->damage_lock, flags); - dlfb->damage_x = min(x, dlfb->damage_x); - dlfb->damage_x2 = max(x2, dlfb->damage_x2); - dlfb->damage_y = min(y, dlfb->damage_y); - dlfb->damage_y2 = max(y2, dlfb->damage_y2); - spin_unlock_irqrestore(&dlfb->damage_lock, flags); - - schedule_work(&dlfb->damage_work); -} - -/* - * 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; - struct dlfb_data *dlfb = info->par; - u32 offset = (u32) *ppos; - - result = fb_sys_write(info, buf, count, ppos); - - if (result > 0) { - int start = max((int)(offset / info->fix.line_length), 0); - int lines = min((u32)((result / info->fix.line_length) + 1), - (u32)info->var.yres); - - dlfb_handle_damage(dlfb, 0, start, info->var.xres, - lines); - } - - 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 *dlfb = info->par; - - sys_copyarea(info, area); - - dlfb_offload_damage(dlfb, area->dx, area->dy, - area->width, area->height); -} - -static void dlfb_ops_imageblit(struct fb_info *info, - const struct fb_image *image) -{ - struct dlfb_data *dlfb = info->par; - - sys_imageblit(info, image); - - dlfb_offload_damage(dlfb, image->dx, image->dy, - image->width, image->height); -} - -static void dlfb_ops_fillrect(struct fb_info *info, - const struct fb_fillrect *rect) -{ - struct dlfb_data *dlfb = info->par; - - sys_fillrect(info, rect); - - dlfb_offload_damage(dlfb, rect->dx, rect->dy, rect->width, - rect->height); -} - -/* - * 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 *dlfb = 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; - - mutex_lock(&dlfb->render_mutex); - - if (!fb_defio) - goto unlock_ret; - - if (!atomic_read(&dlfb->usb_active)) - goto unlock_ret; - - start_cycles = get_cycles(); - - urb = dlfb_get_urb(dlfb); - if (!urb) - goto unlock_ret; - - 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(dlfb, &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) { - int len; - if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) - *cmd++ = 0xAF; - /* Send partial buffer remaining before exiting */ - len = cmd - (char *) urb->transfer_buffer; - dlfb_submit_urb(dlfb, urb, len); - bytes_sent += len; - } else - dlfb_urb_completion(urb); - -error: - atomic_add(bytes_sent, &dlfb->bytes_sent); - atomic_add(bytes_identical, &dlfb->bytes_identical); - atomic_add(bytes_rendered, &dlfb->bytes_rendered); - end_cycles = get_cycles(); - atomic_add(((unsigned int) ((end_cycles - start_cycles) - >> 10)), /* Kcycles */ - &dlfb->cpu_kcycles_used); -unlock_ret: - mutex_unlock(&dlfb->render_mutex); -} - -static int dlfb_get_edid(struct dlfb_data *dlfb, char *edid, int len) -{ - int i, ret; - char *rbuf; - - rbuf = kmalloc(2, GFP_KERNEL); - if (!rbuf) - return 0; - - for (i = 0; i < len; i++) { - ret = usb_control_msg(dlfb->udev, - usb_rcvctrlpipe(dlfb->udev, 0), 0x02, - (0x80 | (0x02 << 5)), i << 8, 0xA1, - rbuf, 2, USB_CTRL_GET_TIMEOUT); - if (ret < 2) { - dev_err(&dlfb->udev->dev, - "Read EDID byte %d failed: %d\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 *dlfb = info->par; - - if (!atomic_read(&dlfb->usb_active)) - return 0; - - /* TODO: Update X server to get this from sysfs instead */ - if (cmd == DLFB_IOCTL_RETURN_EDID) { - void __user *edid = (void __user *)arg; - if (copy_to_user(edid, dlfb->edid, dlfb->edid_size)) - return -EFAULT; - return 0; - } - - /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ - if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { - struct dloarea area; - - if (copy_from_user(&area, (void __user *)arg, - sizeof(struct dloarea))) - return -EFAULT; - - /* - * If we have a damage-aware client, turn fb_defio "off" - * To avoid perf imact of unnecessary 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; - - 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(dlfb, area.x, area.y, area.w, area.h); - } - - 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 *dlfb = 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 (dlfb->virtualized) - return -ENODEV; - - dlfb->fb_count++; - - if (fb_defio && (info->fbdefio == NULL)) { - /* enable defio at last moment if not disabled by client */ - - struct fb_deferred_io *fbdefio; - - fbdefio = kzalloc(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); - } - - dev_dbg(info->dev, "open, user=%d fb_info=%p count=%d\n", - user, info, dlfb->fb_count); - - return 0; -} - -static void dlfb_ops_destroy(struct fb_info *info) -{ - struct dlfb_data *dlfb = info->par; - - cancel_work_sync(&dlfb->damage_work); - - mutex_destroy(&dlfb->render_mutex); - - if (info->cmap.len != 0) - fb_dealloc_cmap(&info->cmap); - if (info->monspecs.modedb) - fb_destroy_modedb(info->monspecs.modedb); - vfree(info->screen_base); - - fb_destroy_modelist(&info->modelist); - - while (!list_empty(&dlfb->deferred_free)) { - struct dlfb_deferred_free *d = list_entry(dlfb->deferred_free.next, struct dlfb_deferred_free, list); - list_del(&d->list); - vfree(d->mem); - kfree(d); - } - vfree(dlfb->backing_buffer); - kfree(dlfb->edid); - usb_put_dev(dlfb->udev); - kfree(dlfb); - - /* Assume info structure is freed after this point */ - framebuffer_release(info); -} - -/* - * 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 *dlfb = info->par; - - dlfb->fb_count--; - - if ((dlfb->fb_count == 0) && (info->fbdefio)) { - fb_deferred_io_cleanup(info); - kfree(info->fbdefio); - info->fbdefio = NULL; - } - - dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count); - - 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 dlfb_data *dlfb) -{ - if (mode->xres * mode->yres > dlfb->sku_pixel_limit) - return 0; - - 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 }; - - var->bits_per_pixel = 16; - var->red = red; - var->green = green; - var->blue = blue; -} - -static int dlfb_ops_check_var(struct fb_var_screeninfo *var, - struct fb_info *info) -{ - struct fb_videomode mode; - struct dlfb_data *dlfb = info->par; - - /* set device-specific elements of var unrelated to mode */ - dlfb_var_color_format(var); - - fb_var_to_videomode(&mode, var); - - if (!dlfb_is_valid_mode(&mode, dlfb)) - return -EINVAL; - - return 0; -} - -static int dlfb_ops_set_par(struct fb_info *info) -{ - struct dlfb_data *dlfb = info->par; - int result; - u16 *pix_framebuffer; - int i; - struct fb_var_screeninfo fvs; - u32 line_length = info->var.xres * (info->var.bits_per_pixel / 8); - - /* clear the activate field because it causes spurious miscompares */ - fvs = info->var; - fvs.activate = 0; - fvs.vmode &= ~FB_VMODE_SMOOTH_XPAN; - - if (!memcmp(&dlfb->current_mode, &fvs, sizeof(struct fb_var_screeninfo))) - return 0; - - result = dlfb_realloc_framebuffer(dlfb, info, info->var.yres * line_length); - if (result) - return result; - - result = dlfb_set_video_mode(dlfb, &info->var); - - if (result) - return result; - - dlfb->current_mode = fvs; - info->fix.line_length = line_length; - - if (dlfb->fb_count == 0) { - - /* paint greenscreen */ - - pix_framebuffer = (u16 *) info->screen_base; - for (i = 0; i < info->fix.smem_len / 2; i++) - pix_framebuffer[i] = 0x37e6; - } - - dlfb_handle_damage(dlfb, 0, 0, info->var.xres, info->var.yres); - - return 0; -} - -/* To fonzi the jukebox (e.g. make blanking changes take effect) */ -static char *dlfb_dummy_render(char *buf) -{ - *buf++ = 0xAF; - *buf++ = 0x6A; /* copy */ - *buf++ = 0x00; /* from address*/ - *buf++ = 0x00; - *buf++ = 0x00; - *buf++ = 0x01; /* one pixel */ - *buf++ = 0x00; /* to address */ - *buf++ = 0x00; - *buf++ = 0x00; - return buf; -} - -/* - * In order to come back from full DPMS off, we need to set the mode again - */ -static int dlfb_ops_blank(int blank_mode, struct fb_info *info) -{ - struct dlfb_data *dlfb = info->par; - char *bufptr; - struct urb *urb; - - dev_dbg(info->dev, "blank, mode %d --> %d\n", - dlfb->blank_mode, blank_mode); - - if ((dlfb->blank_mode == FB_BLANK_POWERDOWN) && - (blank_mode != FB_BLANK_POWERDOWN)) { - - /* returning from powerdown requires a fresh modeset */ - dlfb_set_video_mode(dlfb, &info->var); - } - - urb = dlfb_get_urb(dlfb); - if (!urb) - return 0; - - bufptr = (char *) urb->transfer_buffer; - bufptr = dlfb_vidreg_lock(bufptr); - bufptr = dlfb_blanking(bufptr, blank_mode); - bufptr = dlfb_vidreg_unlock(bufptr); - - /* seems like a render op is needed to have blank change take effect */ - bufptr = dlfb_dummy_render(bufptr); - - dlfb_submit_urb(dlfb, urb, bufptr - - (char *) urb->transfer_buffer); - - dlfb->blank_mode = blank_mode; - - return 0; -} - -static const struct fb_ops dlfb_ops = { - .owner = THIS_MODULE, - .fb_read = fb_sys_read, - .fb_write = dlfb_ops_write, - .fb_setcolreg = dlfb_ops_setcolreg, - .fb_fillrect = dlfb_ops_fillrect, - .fb_copyarea = dlfb_ops_copyarea, - .fb_imageblit = dlfb_ops_imageblit, - .fb_mmap = dlfb_ops_mmap, - .fb_ioctl = dlfb_ops_ioctl, - .fb_open = dlfb_ops_open, - .fb_release = dlfb_ops_release, - .fb_blank = dlfb_ops_blank, - .fb_check_var = dlfb_ops_check_var, - .fb_set_par = dlfb_ops_set_par, - .fb_destroy = dlfb_ops_destroy, -}; - - -static void dlfb_deferred_vfree(struct dlfb_data *dlfb, void *mem) -{ - struct dlfb_deferred_free *d = kmalloc(sizeof(struct dlfb_deferred_free), GFP_KERNEL); - if (!d) - return; - d->mem = mem; - list_add(&d->list, &dlfb->deferred_free); -} - -/* - * Assumes &info->lock held by caller - * Assumes no active clients have framebuffer open - */ -static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len) -{ - u32 old_len = info->fix.smem_len; - const void *old_fb = (const void __force *)info->screen_base; - unsigned char *new_fb; - unsigned char *new_back = NULL; - - new_len = PAGE_ALIGN(new_len); - - if (new_len > old_len) { - /* - * Alloc system memory for virtual framebuffer - */ - new_fb = vmalloc(new_len); - if (!new_fb) { - dev_err(info->dev, "Virtual framebuffer alloc failed\n"); - return -ENOMEM; - } - memset(new_fb, 0xff, new_len); - - if (info->screen_base) { - memcpy(new_fb, old_fb, old_len); - dlfb_deferred_vfree(dlfb, (void __force *)info->screen_base); - } - - info->screen_base = (char __iomem *)new_fb; - info->fix.smem_len = new_len; - info->fix.smem_start = (unsigned long) new_fb; - info->flags = udlfb_info_flags; - - /* - * Second framebuffer copy to mirror the framebuffer state - * on the physical USB device. We can function without this. - * But with imperfect damage info we may send pixels over USB - * that were, in fact, unchanged - wasting limited USB bandwidth - */ - if (shadow) - new_back = vzalloc(new_len); - if (!new_back) - dev_info(info->dev, - "No shadow/backing buffer allocated\n"); - else { - dlfb_deferred_vfree(dlfb, dlfb->backing_buffer); - dlfb->backing_buffer = new_back; - } - } - return 0; -} - -/* - * 1) Get EDID from hw, or use sw default - * 2) Parse into various fb_info structs - * 3) Allocate virtual framebuffer memory to back highest res mode - * - * Parses EDID into three places used by various parts of fbdev: - * fb_var_screeninfo contains the timing of the monitor's preferred mode - * fb_info.monspecs is full parsed EDID info, including monspecs.modedb - * fb_info.modelist is a linked list of all monitor & VESA modes which work - * - * If EDID is not readable/valid, then modelist is all VESA modes, - * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode - * Returns 0 if successful - */ -static int dlfb_setup_modes(struct dlfb_data *dlfb, - struct fb_info *info, - char *default_edid, size_t default_edid_size) -{ - char *edid; - int i, result = 0, tries = 3; - struct device *dev = info->device; - struct fb_videomode *mode; - const struct fb_videomode *default_vmode = NULL; - - if (info->dev) { - /* only use mutex if info has been registered */ - mutex_lock(&info->lock); - /* parent device is used otherwise */ - dev = info->dev; - } - - edid = kmalloc(EDID_LENGTH, GFP_KERNEL); - if (!edid) { - result = -ENOMEM; - goto error; - } - - fb_destroy_modelist(&info->modelist); - memset(&info->monspecs, 0, sizeof(info->monspecs)); - - /* - * Try to (re)read EDID from hardware first - * EDID data may return, but not parse as valid - * Try again a few times, in case of e.g. analog cable noise - */ - while (tries--) { - - i = dlfb_get_edid(dlfb, edid, EDID_LENGTH); - - if (i >= EDID_LENGTH) - fb_edid_to_monspecs(edid, &info->monspecs); - - if (info->monspecs.modedb_len > 0) { - dlfb->edid = edid; - dlfb->edid_size = i; - break; - } - } - - /* If that fails, use a previously returned EDID if available */ - if (info->monspecs.modedb_len == 0) { - dev_err(dev, "Unable to get valid EDID from device/display\n"); - - if (dlfb->edid) { - fb_edid_to_monspecs(dlfb->edid, &info->monspecs); - if (info->monspecs.modedb_len > 0) - dev_err(dev, "Using previously queried EDID\n"); - } - } - - /* If that fails, use the default EDID we were handed */ - if (info->monspecs.modedb_len == 0) { - if (default_edid_size >= EDID_LENGTH) { - fb_edid_to_monspecs(default_edid, &info->monspecs); - if (info->monspecs.modedb_len > 0) { - memcpy(edid, default_edid, default_edid_size); - dlfb->edid = edid; - dlfb->edid_size = default_edid_size; - dev_err(dev, "Using default/backup EDID\n"); - } - } - } - - /* If we've got modes, let's pick a best default mode */ - if (info->monspecs.modedb_len > 0) { - - for (i = 0; i < info->monspecs.modedb_len; i++) { - mode = &info->monspecs.modedb[i]; - if (dlfb_is_valid_mode(mode, dlfb)) { - fb_add_videomode(mode, &info->modelist); - } else { - dev_dbg(dev, "Specified mode %dx%d too big\n", - mode->xres, mode->yres); - if (i == 0) - /* if we've removed top/best mode */ - info->monspecs.misc - &= ~FB_MISC_1ST_DETAIL; - } - } - - default_vmode = fb_find_best_display(&info->monspecs, - &info->modelist); - } - - /* If everything else has failed, fall back to safe default mode */ - if (default_vmode == NULL) { - - struct fb_videomode fb_vmode = {0}; - - /* - * Add the standard VESA modes to our modelist - * Since we don't have EDID, there may be modes that - * overspec monitor and/or are incorrect aspect ratio, etc. - * But at least the user has a chance to choose - */ - for (i = 0; i < VESA_MODEDB_SIZE; i++) { - mode = (struct fb_videomode *)&vesa_modes[i]; - if (dlfb_is_valid_mode(mode, dlfb)) - fb_add_videomode(mode, &info->modelist); - else - dev_dbg(dev, "VESA mode %dx%d too big\n", - mode->xres, mode->yres); - } - - /* - * default to resolution safe for projectors - * (since they are most common case without EDID) - */ - fb_vmode.xres = 800; - fb_vmode.yres = 600; - fb_vmode.refresh = 60; - default_vmode = fb_find_nearest_mode(&fb_vmode, - &info->modelist); - } - - /* If we have good mode and no active clients*/ - if ((default_vmode != NULL) && (dlfb->fb_count == 0)) { - - fb_videomode_to_var(&info->var, default_vmode); - dlfb_var_color_format(&info->var); - - /* - * with mode size info, we can now alloc our framebuffer. - */ - memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix)); - } else - result = -EINVAL; - -error: - if (edid && (dlfb->edid != edid)) - kfree(edid); - - if (info->dev) - mutex_unlock(&info->lock); - - return result; -} - -static ssize_t metrics_bytes_rendered_show(struct device *fbdev, - struct device_attribute *a, char *buf) { - struct fb_info *fb_info = dev_get_drvdata(fbdev); - struct dlfb_data *dlfb = fb_info->par; - return snprintf(buf, PAGE_SIZE, "%u\n", - atomic_read(&dlfb->bytes_rendered)); -} - -static ssize_t metrics_bytes_identical_show(struct device *fbdev, - struct device_attribute *a, char *buf) { - struct fb_info *fb_info = dev_get_drvdata(fbdev); - struct dlfb_data *dlfb = fb_info->par; - return snprintf(buf, PAGE_SIZE, "%u\n", - atomic_read(&dlfb->bytes_identical)); -} - -static ssize_t metrics_bytes_sent_show(struct device *fbdev, - struct device_attribute *a, char *buf) { - struct fb_info *fb_info = dev_get_drvdata(fbdev); - struct dlfb_data *dlfb = fb_info->par; - return snprintf(buf, PAGE_SIZE, "%u\n", - atomic_read(&dlfb->bytes_sent)); -} - -static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, - struct device_attribute *a, char *buf) { - struct fb_info *fb_info = dev_get_drvdata(fbdev); - struct dlfb_data *dlfb = fb_info->par; - return snprintf(buf, PAGE_SIZE, "%u\n", - atomic_read(&dlfb->cpu_kcycles_used)); -} - -static ssize_t edid_show( - struct file *filp, - struct kobject *kobj, struct bin_attribute *a, - char *buf, loff_t off, size_t count) { - struct device *fbdev = kobj_to_dev(kobj); - struct fb_info *fb_info = dev_get_drvdata(fbdev); - struct dlfb_data *dlfb = fb_info->par; - - if (dlfb->edid == NULL) - return 0; - - if ((off >= dlfb->edid_size) || (count > dlfb->edid_size)) - return 0; - - if (off + count > dlfb->edid_size) - count = dlfb->edid_size - off; - - memcpy(buf, dlfb->edid, count); - - return count; -} - -static ssize_t edid_store( - struct file *filp, - struct kobject *kobj, struct bin_attribute *a, - char *src, loff_t src_off, size_t src_size) { - struct device *fbdev = kobj_to_dev(kobj); - struct fb_info *fb_info = dev_get_drvdata(fbdev); - struct dlfb_data *dlfb = fb_info->par; - int ret; - - /* We only support write of entire EDID at once, no offset*/ - if ((src_size != EDID_LENGTH) || (src_off != 0)) - return -EINVAL; - - ret = dlfb_setup_modes(dlfb, fb_info, src, src_size); - if (ret) - return ret; - - if (!dlfb->edid || memcmp(src, dlfb->edid, src_size)) - return -EINVAL; - - ret = dlfb_ops_set_par(fb_info); - if (ret) - return ret; - - return src_size; -} - -static ssize_t metrics_reset_store(struct device *fbdev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct fb_info *fb_info = dev_get_drvdata(fbdev); - struct dlfb_data *dlfb = fb_info->par; - - atomic_set(&dlfb->bytes_rendered, 0); - atomic_set(&dlfb->bytes_identical, 0); - atomic_set(&dlfb->bytes_sent, 0); - atomic_set(&dlfb->cpu_kcycles_used, 0); - - return count; -} - -static const struct bin_attribute edid_attr = { - .attr.name = "edid", - .attr.mode = 0666, - .size = EDID_LENGTH, - .read = edid_show, - .write = edid_store -}; - -static const struct device_attribute fb_device_attrs[] = { - __ATTR_RO(metrics_bytes_rendered), - __ATTR_RO(metrics_bytes_identical), - __ATTR_RO(metrics_bytes_sent), - __ATTR_RO(metrics_cpu_kcycles_used), - __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store), -}; - -/* - * This is necessary before we can communicate with the display controller. - */ -static int dlfb_select_std_channel(struct dlfb_data *dlfb) -{ - int ret; - void *buf; - static const u8 set_def_chn[] = { - 0x57, 0xCD, 0xDC, 0xA7, - 0x1C, 0x88, 0x5E, 0x15, - 0x60, 0xFE, 0xC6, 0x97, - 0x16, 0x3D, 0x47, 0xF2 }; - - buf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL); - - if (!buf) - return -ENOMEM; - - ret = usb_control_msg(dlfb->udev, usb_sndctrlpipe(dlfb->udev, 0), - NR_USB_REQUEST_CHANNEL, - (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, - buf, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT); - - kfree(buf); - - return ret; -} - -static int dlfb_parse_vendor_descriptor(struct dlfb_data *dlfb, - struct usb_interface *intf) -{ - char *desc; - char *buf; - char *desc_end; - int total_len; - - buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); - if (!buf) - return false; - desc = buf; - - total_len = usb_get_descriptor(interface_to_usbdev(intf), - 0x5f, /* vendor specific */ - 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); - - /* if not found, look in configuration descriptor */ - if (total_len < 0) { - if (0 == usb_get_extra_descriptor(intf->cur_altsetting, - 0x5f, &desc)) - total_len = (int) desc[0]; - } - - if (total_len > 5) { - dev_info(&intf->dev, - "vendor descriptor length: %d data: %11ph\n", - total_len, desc); - - if ((desc[0] != total_len) || /* descriptor length */ - (desc[1] != 0x5f) || /* vendor descriptor type */ - (desc[2] != 0x01) || /* version (2 bytes) */ - (desc[3] != 0x00) || - (desc[4] != total_len - 2)) /* length after type */ - goto unrecognized; - - desc_end = desc + total_len; - desc += 5; /* the fixed header we've already parsed */ - - while (desc < desc_end) { - u8 length; - u16 key; - - key = *desc++; - key |= (u16)*desc++ << 8; - length = *desc++; - - switch (key) { - case 0x0200: { /* max_area */ - u32 max_area = *desc++; - max_area |= (u32)*desc++ << 8; - max_area |= (u32)*desc++ << 16; - max_area |= (u32)*desc++ << 24; - dev_warn(&intf->dev, - "DL chip limited to %d pixel modes\n", - max_area); - dlfb->sku_pixel_limit = max_area; - break; - } - default: - break; - } - desc += length; - } - } else { - dev_info(&intf->dev, "vendor descriptor not available (%d)\n", - total_len); - } - - goto success; - -unrecognized: - /* allow udlfb to load for now even if firmware unrecognized */ - dev_err(&intf->dev, "Unrecognized vendor firmware descriptor\n"); - -success: - kfree(buf); - return true; -} - -static int dlfb_usb_probe(struct usb_interface *intf, - const struct usb_device_id *id) -{ - int i; - const struct device_attribute *attr; - struct dlfb_data *dlfb; - struct fb_info *info; - int retval = -ENOMEM; - struct usb_device *usbdev = interface_to_usbdev(intf); - - /* usb initialization */ - dlfb = kzalloc(sizeof(*dlfb), GFP_KERNEL); - if (!dlfb) { - dev_err(&intf->dev, "%s: failed to allocate dlfb\n", __func__); - return -ENOMEM; - } - - INIT_LIST_HEAD(&dlfb->deferred_free); - - dlfb->udev = usb_get_dev(usbdev); - usb_set_intfdata(intf, dlfb); - - dev_dbg(&intf->dev, "console enable=%d\n", console); - dev_dbg(&intf->dev, "fb_defio enable=%d\n", fb_defio); - dev_dbg(&intf->dev, "shadow enable=%d\n", shadow); - - dlfb->sku_pixel_limit = 2048 * 1152; /* default to maximum */ - - if (!dlfb_parse_vendor_descriptor(dlfb, intf)) { - dev_err(&intf->dev, - "firmware not recognized, incompatible device?\n"); - goto error; - } - - if (pixel_limit) { - dev_warn(&intf->dev, - "DL chip limit of %d overridden to %d\n", - dlfb->sku_pixel_limit, pixel_limit); - dlfb->sku_pixel_limit = pixel_limit; - } - - - /* allocates framebuffer driver structure, not framebuffer memory */ - info = framebuffer_alloc(0, &dlfb->udev->dev); - if (!info) - goto error; - - dlfb->info = info; - info->par = dlfb; - info->pseudo_palette = dlfb->pseudo_palette; - dlfb->ops = dlfb_ops; - info->fbops = &dlfb->ops; - - mutex_init(&dlfb->render_mutex); - dlfb_init_damage(dlfb); - spin_lock_init(&dlfb->damage_lock); - INIT_WORK(&dlfb->damage_work, dlfb_damage_work); - - INIT_LIST_HEAD(&info->modelist); - - if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) { - retval = -ENOMEM; - dev_err(&intf->dev, "unable to allocate urb list\n"); - goto error; - } - - /* We don't register a new USB class. Our client interface is dlfbev */ - - retval = fb_alloc_cmap(&info->cmap, 256, 0); - if (retval < 0) { - dev_err(info->device, "cmap allocation failed: %d\n", retval); - goto error; - } - - retval = dlfb_setup_modes(dlfb, info, NULL, 0); - if (retval != 0) { - dev_err(info->device, - "unable to find common mode for display and adapter\n"); - goto error; - } - - /* ready to begin using device */ - - atomic_set(&dlfb->usb_active, 1); - dlfb_select_std_channel(dlfb); - - dlfb_ops_check_var(&info->var, info); - retval = dlfb_ops_set_par(info); - if (retval) - goto error; - - retval = register_framebuffer(info); - if (retval < 0) { - dev_err(info->device, "unable to register framebuffer: %d\n", - retval); - goto error; - } - - for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) { - attr = &fb_device_attrs[i]; - retval = device_create_file(info->dev, attr); - if (retval) - dev_warn(info->device, - "failed to create '%s' attribute: %d\n", - attr->attr.name, retval); - } - - retval = device_create_bin_file(info->dev, &edid_attr); - if (retval) - dev_warn(info->device, "failed to create '%s' attribute: %d\n", - edid_attr.attr.name, retval); - - dev_info(info->device, - "%s is DisplayLink USB device (%dx%d, %dK framebuffer memory)\n", - dev_name(info->dev), info->var.xres, info->var.yres, - ((dlfb->backing_buffer) ? - info->fix.smem_len * 2 : info->fix.smem_len) >> 10); - return 0; - -error: - if (dlfb->info) { - dlfb_ops_destroy(dlfb->info); - } else { - usb_put_dev(dlfb->udev); - kfree(dlfb); - } - return retval; -} - -static void dlfb_usb_disconnect(struct usb_interface *intf) -{ - struct dlfb_data *dlfb; - struct fb_info *info; - int i; - - dlfb = usb_get_intfdata(intf); - info = dlfb->info; - - dev_dbg(&intf->dev, "USB disconnect starting\n"); - - /* we virtualize until all fb clients release. Then we free */ - dlfb->virtualized = true; - - /* When non-active we'll update virtual framebuffer, but no new urbs */ - atomic_set(&dlfb->usb_active, 0); - - /* this function will wait for all in-flight urbs to complete */ - dlfb_free_urb_list(dlfb); - - /* remove udlfb's sysfs interfaces */ - for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) - device_remove_file(info->dev, &fb_device_attrs[i]); - device_remove_bin_file(info->dev, &edid_attr); - - unregister_framebuffer(info); -} - -static struct usb_driver dlfb_driver = { - .name = "udlfb", - .probe = dlfb_usb_probe, - .disconnect = dlfb_usb_disconnect, - .id_table = id_table, -}; - -module_usb_driver(dlfb_driver); - -static void dlfb_urb_completion(struct urb *urb) -{ - struct urb_node *unode = urb->context; - struct dlfb_data *dlfb = unode->dlfb; - unsigned long flags; - - switch (urb->status) { - case 0: - /* success */ - break; - case -ECONNRESET: - case -ENOENT: - case -ESHUTDOWN: - /* sync/async unlink faults aren't errors */ - break; - default: - dev_err(&dlfb->udev->dev, - "%s - nonzero write bulk status received: %d\n", - __func__, urb->status); - atomic_set(&dlfb->lost_pixels, 1); - break; - } - - urb->transfer_buffer_length = dlfb->urbs.size; /* reset to actual */ - - spin_lock_irqsave(&dlfb->urbs.lock, flags); - list_add_tail(&unode->entry, &dlfb->urbs.list); - dlfb->urbs.available++; - spin_unlock_irqrestore(&dlfb->urbs.lock, flags); - - up(&dlfb->urbs.limit_sem); -} - -static void dlfb_free_urb_list(struct dlfb_data *dlfb) -{ - int count = dlfb->urbs.count; - struct list_head *node; - struct urb_node *unode; - struct urb *urb; - - /* keep waiting and freeing, until we've got 'em all */ - while (count--) { - down(&dlfb->urbs.limit_sem); - - spin_lock_irq(&dlfb->urbs.lock); - - node = dlfb->urbs.list.next; /* have reserved one with sem */ - list_del_init(node); - - spin_unlock_irq(&dlfb->urbs.lock); - - unode = list_entry(node, struct urb_node, entry); - urb = unode->urb; - - /* Free each separately allocated piece */ - usb_free_coherent(urb->dev, dlfb->urbs.size, - urb->transfer_buffer, urb->transfer_dma); - usb_free_urb(urb); - kfree(node); - } - - dlfb->urbs.count = 0; -} - -static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size) -{ - struct urb *urb; - struct urb_node *unode; - char *buf; - size_t wanted_size = count * size; - - spin_lock_init(&dlfb->urbs.lock); - -retry: - dlfb->urbs.size = size; - INIT_LIST_HEAD(&dlfb->urbs.list); - - sema_init(&dlfb->urbs.limit_sem, 0); - dlfb->urbs.count = 0; - dlfb->urbs.available = 0; - - while (dlfb->urbs.count * size < wanted_size) { - unode = kzalloc(sizeof(*unode), GFP_KERNEL); - if (!unode) - break; - unode->dlfb = dlfb; - - urb = usb_alloc_urb(0, GFP_KERNEL); - if (!urb) { - kfree(unode); - break; - } - unode->urb = urb; - - buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL, - &urb->transfer_dma); - if (!buf) { - kfree(unode); - usb_free_urb(urb); - if (size > PAGE_SIZE) { - size /= 2; - dlfb_free_urb_list(dlfb); - goto retry; - } - break; - } - - /* urb->transfer_buffer_length set to actual before submit */ - usb_fill_bulk_urb(urb, dlfb->udev, usb_sndbulkpipe(dlfb->udev, 1), - buf, size, dlfb_urb_completion, unode); - urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; - - list_add_tail(&unode->entry, &dlfb->urbs.list); - - up(&dlfb->urbs.limit_sem); - dlfb->urbs.count++; - dlfb->urbs.available++; - } - - return dlfb->urbs.count; -} - -static struct urb *dlfb_get_urb(struct dlfb_data *dlfb) -{ - int ret; - struct list_head *entry; - struct urb_node *unode; - - /* Wait for an in-flight buffer to complete and get re-queued */ - ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT); - if (ret) { - atomic_set(&dlfb->lost_pixels, 1); - dev_warn(&dlfb->udev->dev, - "wait for urb interrupted: %d available: %d\n", - ret, dlfb->urbs.available); - return NULL; - } - - spin_lock_irq(&dlfb->urbs.lock); - - BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */ - entry = dlfb->urbs.list.next; - list_del_init(entry); - dlfb->urbs.available--; - - spin_unlock_irq(&dlfb->urbs.lock); - - unode = list_entry(entry, struct urb_node, entry); - return unode->urb; -} - -static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb *urb, size_t len) -{ - int ret; - - BUG_ON(len > dlfb->urbs.size); - - urb->transfer_buffer_length = len; /* set to actual payload len */ - ret = usb_submit_urb(urb, GFP_KERNEL); - if (ret) { - dlfb_urb_completion(urb); /* because no one else will */ - atomic_set(&dlfb->lost_pixels, 1); - dev_err(&dlfb->udev->dev, "submit urb error: %d\n", ret); - } - return ret; -} - -module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); -MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer"); - -module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); -MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes"); - -module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); -MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf"); - -module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); -MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)"); - -MODULE_AUTHOR("Roberto De Ioris roberto@unbit.it, " - "Jaya Kumar jayakumar.lkml@gmail.com, " - "Bernie Thompson bernie@plugable.com"); -MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); -MODULE_LICENSE("GPL"); -