mirror of https://gitee.com/openkylin/linux.git
1980 lines
51 KiB
C
1980 lines
51 KiB
C
/*
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* udlfb.c -- Framebuffer driver for DisplayLink USB controller
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*
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* Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
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* Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
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* Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License v2. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,
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* usb-skeleton by GregKH.
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*
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* Device-specific portions based on information from Displaylink, with work
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* from Florian Echtler, Henrik Bjerregaard Pedersen, and others.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/usb.h>
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#include <linux/uaccess.h>
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#include <linux/mm.h>
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#include <linux/fb.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/prefetch.h>
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#include <linux/delay.h>
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#include <video/udlfb.h>
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#include "edid.h"
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static struct fb_fix_screeninfo dlfb_fix = {
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.id = "udlfb",
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_TRUECOLOR,
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.xpanstep = 0,
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.ypanstep = 0,
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.ywrapstep = 0,
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.accel = FB_ACCEL_NONE,
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};
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static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST |
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FBINFO_VIRTFB |
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FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |
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FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;
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/*
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* There are many DisplayLink-based graphics products, all with unique PIDs.
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* So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
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* We also require a match on SubClass (0x00) and Protocol (0x00),
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* which is compatible with all known USB 2.0 era graphics chips and firmware,
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* but allows DisplayLink to increment those for any future incompatible chips
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*/
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static struct usb_device_id id_table[] = {
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{.idVendor = 0x17e9,
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.bInterfaceClass = 0xff,
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.bInterfaceSubClass = 0x00,
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.bInterfaceProtocol = 0x00,
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.match_flags = USB_DEVICE_ID_MATCH_VENDOR |
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USB_DEVICE_ID_MATCH_INT_CLASS |
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USB_DEVICE_ID_MATCH_INT_SUBCLASS |
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USB_DEVICE_ID_MATCH_INT_PROTOCOL,
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},
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{},
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/* module options */
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static bool console = 1; /* Allow fbcon to open framebuffer */
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static bool fb_defio = 1; /* Detect mmap writes using page faults */
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static bool shadow = 1; /* Optionally disable shadow framebuffer */
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static int pixel_limit; /* Optionally force a pixel resolution limit */
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/* dlfb keeps a list of urbs for efficient bulk transfers */
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static void dlfb_urb_completion(struct urb *urb);
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static struct urb *dlfb_get_urb(struct dlfb_data *dev);
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static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len);
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static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size);
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static void dlfb_free_urb_list(struct dlfb_data *dev);
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/*
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* All DisplayLink bulk operations start with 0xAF, followed by specific code
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* All operations are written to buffers which then later get sent to device
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*/
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static char *dlfb_set_register(char *buf, u8 reg, u8 val)
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{
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*buf++ = 0xAF;
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*buf++ = 0x20;
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*buf++ = reg;
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*buf++ = val;
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return buf;
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}
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static char *dlfb_vidreg_lock(char *buf)
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{
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return dlfb_set_register(buf, 0xFF, 0x00);
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}
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static char *dlfb_vidreg_unlock(char *buf)
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{
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return dlfb_set_register(buf, 0xFF, 0xFF);
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}
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/*
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* Map FB_BLANK_* to DisplayLink register
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* DLReg FB_BLANK_*
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* ----- -----------------------------
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* 0x00 FB_BLANK_UNBLANK (0)
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* 0x01 FB_BLANK (1)
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* 0x03 FB_BLANK_VSYNC_SUSPEND (2)
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* 0x05 FB_BLANK_HSYNC_SUSPEND (3)
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* 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back
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*/
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static char *dlfb_blanking(char *buf, int fb_blank)
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{
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u8 reg;
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switch (fb_blank) {
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case FB_BLANK_POWERDOWN:
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reg = 0x07;
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break;
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case FB_BLANK_HSYNC_SUSPEND:
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reg = 0x05;
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break;
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case FB_BLANK_VSYNC_SUSPEND:
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reg = 0x03;
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break;
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case FB_BLANK_NORMAL:
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reg = 0x01;
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break;
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default:
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reg = 0x00;
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}
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buf = dlfb_set_register(buf, 0x1F, reg);
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return buf;
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}
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static char *dlfb_set_color_depth(char *buf, u8 selection)
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{
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return dlfb_set_register(buf, 0x00, selection);
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}
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static char *dlfb_set_base16bpp(char *wrptr, u32 base)
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{
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/* the base pointer is 16 bits wide, 0x20 is hi byte. */
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wrptr = dlfb_set_register(wrptr, 0x20, base >> 16);
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wrptr = dlfb_set_register(wrptr, 0x21, base >> 8);
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return dlfb_set_register(wrptr, 0x22, base);
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}
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/*
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* DisplayLink HW has separate 16bpp and 8bpp framebuffers.
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* In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
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*/
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static char *dlfb_set_base8bpp(char *wrptr, u32 base)
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{
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wrptr = dlfb_set_register(wrptr, 0x26, base >> 16);
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wrptr = dlfb_set_register(wrptr, 0x27, base >> 8);
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return dlfb_set_register(wrptr, 0x28, base);
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}
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static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value)
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{
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wrptr = dlfb_set_register(wrptr, reg, value >> 8);
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return dlfb_set_register(wrptr, reg+1, value);
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}
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/*
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* This is kind of weird because the controller takes some
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* register values in a different byte order than other registers.
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*/
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static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value)
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{
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wrptr = dlfb_set_register(wrptr, reg, value);
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return dlfb_set_register(wrptr, reg+1, value >> 8);
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}
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/*
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* LFSR is linear feedback shift register. The reason we have this is
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* because the display controller needs to minimize the clock depth of
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* various counters used in the display path. So this code reverses the
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* provided value into the lfsr16 value by counting backwards to get
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* the value that needs to be set in the hardware comparator to get the
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* same actual count. This makes sense once you read above a couple of
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* times and think about it from a hardware perspective.
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*/
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static u16 dlfb_lfsr16(u16 actual_count)
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{
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u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
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while (actual_count--) {
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lv = ((lv << 1) |
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(((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))
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& 0xFFFF;
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}
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return (u16) lv;
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}
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/*
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* This does LFSR conversion on the value that is to be written.
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* See LFSR explanation above for more detail.
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*/
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static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
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{
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return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value));
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}
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/*
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* This takes a standard fbdev screeninfo struct and all of its monitor mode
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* details and converts them into the DisplayLink equivalent register commands.
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*/
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static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var)
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{
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u16 xds, yds;
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u16 xde, yde;
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u16 yec;
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/* x display start */
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xds = var->left_margin + var->hsync_len;
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds);
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/* x display end */
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xde = xds + var->xres;
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde);
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/* y display start */
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yds = var->upper_margin + var->vsync_len;
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds);
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/* y display end */
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yde = yds + var->yres;
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde);
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/* x end count is active + blanking - 1 */
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x09,
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xde + var->right_margin - 1);
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/* libdlo hardcodes hsync start to 1 */
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1);
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/* hsync end is width of sync pulse + 1 */
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1);
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/* hpixels is active pixels */
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wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres);
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/* yendcount is vertical active + vertical blanking */
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yec = var->yres + var->upper_margin + var->lower_margin +
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var->vsync_len;
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec);
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/* libdlo hardcodes vsync start to 0 */
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0);
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/* vsync end is width of vsync pulse */
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len);
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/* vpixels is active pixels */
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wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres);
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/* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */
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wrptr = dlfb_set_register_16be(wrptr, 0x1B,
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200*1000*1000/var->pixclock);
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return wrptr;
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}
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/*
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* This takes a standard fbdev screeninfo struct that was fetched or prepared
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* and then generates the appropriate command sequence that then drives the
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* display controller.
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*/
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static int dlfb_set_video_mode(struct dlfb_data *dev,
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struct fb_var_screeninfo *var)
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{
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char *buf;
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char *wrptr;
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int retval = 0;
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int writesize;
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struct urb *urb;
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if (!atomic_read(&dev->usb_active))
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return -EPERM;
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urb = dlfb_get_urb(dev);
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if (!urb)
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return -ENOMEM;
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buf = (char *) urb->transfer_buffer;
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/*
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* This first section has to do with setting the base address on the
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* controller * associated with the display. There are 2 base
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* pointers, currently, we only * use the 16 bpp segment.
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*/
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wrptr = dlfb_vidreg_lock(buf);
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wrptr = dlfb_set_color_depth(wrptr, 0x00);
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/* set base for 16bpp segment to 0 */
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wrptr = dlfb_set_base16bpp(wrptr, 0);
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/* set base for 8bpp segment to end of fb */
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wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len);
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wrptr = dlfb_set_vid_cmds(wrptr, var);
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wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK);
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wrptr = dlfb_vidreg_unlock(wrptr);
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writesize = wrptr - buf;
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retval = dlfb_submit_urb(dev, urb, writesize);
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dev->blank_mode = FB_BLANK_UNBLANK;
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return retval;
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}
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static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
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{
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unsigned long start = vma->vm_start;
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unsigned long size = vma->vm_end - vma->vm_start;
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unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
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unsigned long page, pos;
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if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
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return -EINVAL;
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if (size > info->fix.smem_len)
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return -EINVAL;
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if (offset > info->fix.smem_len - size)
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return -EINVAL;
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pos = (unsigned long)info->fix.smem_start + offset;
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pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
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pos, size);
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while (size > 0) {
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page = vmalloc_to_pfn((void *)pos);
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if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
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return -EAGAIN;
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start += PAGE_SIZE;
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pos += PAGE_SIZE;
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if (size > PAGE_SIZE)
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size -= PAGE_SIZE;
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else
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size = 0;
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}
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return 0;
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}
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/*
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* Trims identical data from front and back of line
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* Sets new front buffer address and width
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* And returns byte count of identical pixels
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* Assumes CPU natural alignment (unsigned long)
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* for back and front buffer ptrs and width
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*/
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static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes)
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{
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int j, k;
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const unsigned long *back = (const unsigned long *) bback;
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const unsigned long *front = (const unsigned long *) *bfront;
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const int width = *width_bytes / sizeof(unsigned long);
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int identical = width;
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int start = width;
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int end = width;
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prefetch((void *) front);
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prefetch((void *) back);
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for (j = 0; j < width; j++) {
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if (back[j] != front[j]) {
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start = j;
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break;
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}
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}
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for (k = width - 1; k > j; k--) {
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if (back[k] != front[k]) {
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end = k+1;
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break;
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}
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}
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identical = start + (width - end);
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*bfront = (u8 *) &front[start];
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*width_bytes = (end - start) * sizeof(unsigned long);
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return identical * sizeof(unsigned long);
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}
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/*
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* Render a command stream for an encoded horizontal line segment of pixels.
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*
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* A command buffer holds several commands.
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* It always begins with a fresh command header
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* (the protocol doesn't require this, but we enforce it to allow
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* multiple buffers to be potentially encoded and sent in parallel).
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* A single command encodes one contiguous horizontal line of pixels
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*
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* The function relies on the client to do all allocation, so that
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* rendering can be done directly to output buffers (e.g. USB URBs).
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* The function fills the supplied command buffer, providing information
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* on where it left off, so the client may call in again with additional
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* buffers if the line will take several buffers to complete.
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*
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* A single command can transmit a maximum of 256 pixels,
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* regardless of the compression ratio (protocol design limit).
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* To the hardware, 0 for a size byte means 256
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*
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* Rather than 256 pixel commands which are either rl or raw encoded,
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* the rlx command simply assumes alternating raw and rl spans within one cmd.
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* This has a slightly larger header overhead, but produces more even results.
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* It also processes all data (read and write) in a single pass.
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* Performance benchmarks of common cases show it having just slightly better
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* compression than 256 pixel raw or rle commands, with similar CPU consumpion.
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* But for very rl friendly data, will compress not quite as well.
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*/
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static void dlfb_compress_hline(
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const uint16_t **pixel_start_ptr,
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const uint16_t *const pixel_end,
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uint32_t *device_address_ptr,
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uint8_t **command_buffer_ptr,
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const uint8_t *const cmd_buffer_end)
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{
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const uint16_t *pixel = *pixel_start_ptr;
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uint32_t dev_addr = *device_address_ptr;
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uint8_t *cmd = *command_buffer_ptr;
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const int bpp = 2;
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while ((pixel_end > pixel) &&
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(cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) {
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uint8_t *raw_pixels_count_byte = NULL;
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uint8_t *cmd_pixels_count_byte = NULL;
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const uint16_t *raw_pixel_start = NULL;
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const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL;
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prefetchw((void *) cmd); /* pull in one cache line at least */
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*cmd++ = 0xAF;
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*cmd++ = 0x6B;
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*cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF);
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*cmd++ = (uint8_t) ((dev_addr >> 8) & 0xFF);
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*cmd++ = (uint8_t) ((dev_addr) & 0xFF);
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cmd_pixels_count_byte = cmd++; /* we'll know this later */
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cmd_pixel_start = pixel;
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raw_pixels_count_byte = cmd++; /* we'll know this later */
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raw_pixel_start = pixel;
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cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1,
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min((int)(pixel_end - pixel),
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(int)(cmd_buffer_end - cmd) / bpp));
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prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp);
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while (pixel < cmd_pixel_end) {
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const uint16_t * const repeating_pixel = pixel;
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*(uint16_t *)cmd = cpu_to_be16p(pixel);
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cmd += 2;
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pixel++;
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if (unlikely((pixel < cmd_pixel_end) &&
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(*pixel == *repeating_pixel))) {
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/* go back and fill in raw pixel count */
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*raw_pixels_count_byte = ((repeating_pixel -
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raw_pixel_start) + 1) & 0xFF;
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while ((pixel < cmd_pixel_end)
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&& (*pixel == *repeating_pixel)) {
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pixel++;
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}
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/* immediately after raw data is repeat byte */
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*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;
|
|
}
|
|
|
|
static 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;
|
|
}
|
|
|
|
/*
|
|
* 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 *dev = 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(dev, 0, start, info->var.xres,
|
|
lines, info->screen_base);
|
|
}
|
|
|
|
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;
|
|
|
|
sys_copyarea(info, area);
|
|
|
|
dlfb_handle_damage(dev, area->dx, area->dy,
|
|
area->width, area->height, info->screen_base);
|
|
}
|
|
|
|
static void dlfb_ops_imageblit(struct fb_info *info,
|
|
const struct fb_image *image)
|
|
{
|
|
struct dlfb_data *dev = info->par;
|
|
|
|
sys_imageblit(info, image);
|
|
|
|
dlfb_handle_damage(dev, image->dx, image->dy,
|
|
image->width, image->height, info->screen_base);
|
|
}
|
|
|
|
static void dlfb_ops_fillrect(struct fb_info *info,
|
|
const struct fb_fillrect *rect)
|
|
{
|
|
struct dlfb_data *dev = info->par;
|
|
|
|
sys_fillrect(info, rect);
|
|
|
|
dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width,
|
|
rect->height, info->screen_base);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
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) {
|
|
pr_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;
|
|
|
|
if (!atomic_read(&dev->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, 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) {
|
|
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(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);
|
|
|
|
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);
|
|
}
|
|
|
|
pr_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);
|
|
|
|
vfree(dev->backing_buffer);
|
|
|
|
kfree(dev->edid);
|
|
|
|
pr_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(struct dlfb_data *dev)
|
|
{
|
|
struct fb_info *info = dev->info;
|
|
|
|
if (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);
|
|
vfree(info->screen_base);
|
|
|
|
fb_destroy_modelist(&info->modelist);
|
|
|
|
dev->info = NULL;
|
|
|
|
/* Assume info structure is freed after this point */
|
|
framebuffer_release(info);
|
|
|
|
pr_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);
|
|
}
|
|
|
|
static void dlfb_free_framebuffer_work(struct work_struct *work)
|
|
{
|
|
struct dlfb_data *dev = container_of(work, struct dlfb_data,
|
|
free_framebuffer_work.work);
|
|
dlfb_free_framebuffer(dev);
|
|
}
|
|
/*
|
|
* 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);
|
|
|
|
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;
|
|
}
|
|
|
|
pr_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) {
|
|
pr_warn("%dx%d beyond chip capabilities\n",
|
|
mode->xres, mode->yres);
|
|
return 0;
|
|
}
|
|
|
|
pr_info("%dx%d @ %d Hz valid mode\n", mode->xres, mode->yres,
|
|
mode->refresh);
|
|
|
|
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;
|
|
|
|
/* TODO: support dynamically changing framebuffer size */
|
|
if ((var->xres * var->yres * 2) > info->fix.smem_len)
|
|
return -EINVAL;
|
|
|
|
/* 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, info))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dlfb_ops_set_par(struct fb_info *info)
|
|
{
|
|
struct dlfb_data *dev = info->par;
|
|
int result;
|
|
u16 *pix_framebuffer;
|
|
int i;
|
|
|
|
pr_notice("set_par mode %dx%d\n", info->var.xres, info->var.yres);
|
|
|
|
result = dlfb_set_video_mode(dev, &info->var);
|
|
|
|
if ((result == 0) && (dev->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(dev, 0, 0, info->var.xres, info->var.yres,
|
|
info->screen_base);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* 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 *dev = info->par;
|
|
char *bufptr;
|
|
struct urb *urb;
|
|
|
|
pr_info("/dev/fb%d FB_BLANK mode %d --> %d\n",
|
|
info->node, dev->blank_mode, blank_mode);
|
|
|
|
if ((dev->blank_mode == FB_BLANK_POWERDOWN) &&
|
|
(blank_mode != FB_BLANK_POWERDOWN)) {
|
|
|
|
/* returning from powerdown requires a fresh modeset */
|
|
dlfb_set_video_mode(dev, &info->var);
|
|
}
|
|
|
|
urb = dlfb_get_urb(dev);
|
|
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(dev, urb, bufptr -
|
|
(char *) urb->transfer_buffer);
|
|
|
|
dev->blank_mode = blank_mode;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static 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,
|
|
};
|
|
|
|
|
|
/*
|
|
* Assumes &info->lock held by caller
|
|
* Assumes no active clients have framebuffer open
|
|
*/
|
|
static int dlfb_realloc_framebuffer(struct dlfb_data *dev, struct fb_info *info)
|
|
{
|
|
int retval = -ENOMEM;
|
|
int old_len = info->fix.smem_len;
|
|
int new_len;
|
|
unsigned char *old_fb = info->screen_base;
|
|
unsigned char *new_fb;
|
|
unsigned char *new_back = NULL;
|
|
|
|
pr_warn("Reallocating framebuffer. Addresses will change!\n");
|
|
|
|
new_len = info->fix.line_length * info->var.yres;
|
|
|
|
if (PAGE_ALIGN(new_len) > old_len) {
|
|
/*
|
|
* Alloc system memory for virtual framebuffer
|
|
*/
|
|
new_fb = vmalloc(new_len);
|
|
if (!new_fb) {
|
|
pr_err("Virtual framebuffer alloc failed\n");
|
|
goto error;
|
|
}
|
|
|
|
if (info->screen_base) {
|
|
memcpy(new_fb, old_fb, old_len);
|
|
vfree(info->screen_base);
|
|
}
|
|
|
|
info->screen_base = new_fb;
|
|
info->fix.smem_len = PAGE_ALIGN(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)
|
|
pr_info("No shadow/backing buffer allocated\n");
|
|
else {
|
|
vfree(dev->backing_buffer);
|
|
dev->backing_buffer = new_back;
|
|
}
|
|
}
|
|
|
|
retval = 0;
|
|
|
|
error:
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* 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 *dev,
|
|
struct fb_info *info,
|
|
char *default_edid, size_t default_edid_size)
|
|
{
|
|
int i;
|
|
const struct fb_videomode *default_vmode = NULL;
|
|
int result = 0;
|
|
char *edid;
|
|
int tries = 3;
|
|
|
|
if (info->dev) /* only use mutex if info has been registered */
|
|
mutex_lock(&info->lock);
|
|
|
|
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(dev, edid, EDID_LENGTH);
|
|
|
|
if (i >= EDID_LENGTH)
|
|
fb_edid_to_monspecs(edid, &info->monspecs);
|
|
|
|
if (info->monspecs.modedb_len > 0) {
|
|
dev->edid = edid;
|
|
dev->edid_size = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* If that fails, use a previously returned EDID if available */
|
|
if (info->monspecs.modedb_len == 0) {
|
|
|
|
pr_err("Unable to get valid EDID from device/display\n");
|
|
|
|
if (dev->edid) {
|
|
fb_edid_to_monspecs(dev->edid, &info->monspecs);
|
|
if (info->monspecs.modedb_len > 0)
|
|
pr_err("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);
|
|
dev->edid = edid;
|
|
dev->edid_size = default_edid_size;
|
|
pr_err("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++) {
|
|
if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info))
|
|
fb_add_videomode(&info->monspecs.modedb[i],
|
|
&info->modelist);
|
|
else {
|
|
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++) {
|
|
if (dlfb_is_valid_mode((struct fb_videomode *)
|
|
&vesa_modes[i], info))
|
|
fb_add_videomode(&vesa_modes[i],
|
|
&info->modelist);
|
|
}
|
|
|
|
/*
|
|
* 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) && (dev->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));
|
|
info->fix.line_length = info->var.xres *
|
|
(info->var.bits_per_pixel / 8);
|
|
|
|
result = dlfb_realloc_framebuffer(dev, info);
|
|
|
|
} else
|
|
result = -EINVAL;
|
|
|
|
error:
|
|
if (edid && (dev->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 *dev = fb_info->par;
|
|
return snprintf(buf, PAGE_SIZE, "%u\n",
|
|
atomic_read(&dev->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 *dev = fb_info->par;
|
|
return snprintf(buf, PAGE_SIZE, "%u\n",
|
|
atomic_read(&dev->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 *dev = fb_info->par;
|
|
return snprintf(buf, PAGE_SIZE, "%u\n",
|
|
atomic_read(&dev->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 *dev = fb_info->par;
|
|
return snprintf(buf, PAGE_SIZE, "%u\n",
|
|
atomic_read(&dev->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 = container_of(kobj, struct device, kobj);
|
|
struct fb_info *fb_info = dev_get_drvdata(fbdev);
|
|
struct dlfb_data *dev = fb_info->par;
|
|
|
|
if (dev->edid == NULL)
|
|
return 0;
|
|
|
|
if ((off >= dev->edid_size) || (count > dev->edid_size))
|
|
return 0;
|
|
|
|
if (off + count > dev->edid_size)
|
|
count = dev->edid_size - off;
|
|
|
|
pr_info("sysfs edid copy %p to %p, %d bytes\n",
|
|
dev->edid, buf, (int) count);
|
|
|
|
memcpy(buf, dev->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 = container_of(kobj, struct device, kobj);
|
|
struct fb_info *fb_info = dev_get_drvdata(fbdev);
|
|
struct dlfb_data *dev = 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(dev, fb_info, src, src_size);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!dev->edid || memcmp(src, dev->edid, src_size))
|
|
return -EINVAL;
|
|
|
|
pr_info("sysfs written EDID is new default\n");
|
|
dlfb_ops_set_par(fb_info);
|
|
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 *dev = fb_info->par;
|
|
|
|
atomic_set(&dev->bytes_rendered, 0);
|
|
atomic_set(&dev->bytes_identical, 0);
|
|
atomic_set(&dev->bytes_sent, 0);
|
|
atomic_set(&dev->cpu_kcycles_used, 0);
|
|
|
|
return count;
|
|
}
|
|
|
|
static struct bin_attribute edid_attr = {
|
|
.attr.name = "edid",
|
|
.attr.mode = 0666,
|
|
.size = EDID_LENGTH,
|
|
.read = edid_show,
|
|
.write = edid_store
|
|
};
|
|
|
|
static 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 *dev)
|
|
{
|
|
int ret;
|
|
u8 set_def_chn[] = { 0x57, 0xCD, 0xDC, 0xA7,
|
|
0x1C, 0x88, 0x5E, 0x15,
|
|
0x60, 0xFE, 0xC6, 0x97,
|
|
0x16, 0x3D, 0x47, 0xF2 };
|
|
|
|
ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
|
|
NR_USB_REQUEST_CHANNEL,
|
|
(USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
|
|
set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT);
|
|
return ret;
|
|
}
|
|
|
|
static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev,
|
|
struct usb_interface *interface)
|
|
{
|
|
char *desc;
|
|
char *buf;
|
|
char *desc_end;
|
|
|
|
int total_len = 0;
|
|
|
|
buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
|
|
if (!buf)
|
|
return false;
|
|
desc = buf;
|
|
|
|
total_len = usb_get_descriptor(interface_to_usbdev(interface),
|
|
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(interface->cur_altsetting,
|
|
0x5f, &desc))
|
|
total_len = (int) desc[0];
|
|
}
|
|
|
|
if (total_len > 5) {
|
|
pr_info("vendor descriptor length:%x 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 = le16_to_cpu(*((u16 *) desc));
|
|
desc += sizeof(u16);
|
|
length = *desc;
|
|
desc++;
|
|
|
|
switch (key) {
|
|
case 0x0200: { /* max_area */
|
|
u32 max_area;
|
|
max_area = le32_to_cpu(*((u32 *)desc));
|
|
pr_warn("DL chip limited to %d pixel modes\n",
|
|
max_area);
|
|
dev->sku_pixel_limit = max_area;
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
desc += length;
|
|
}
|
|
} else {
|
|
pr_info("vendor descriptor not available (%d)\n", total_len);
|
|
}
|
|
|
|
goto success;
|
|
|
|
unrecognized:
|
|
/* allow udlfb to load for now even if firmware unrecognized */
|
|
pr_err("Unrecognized vendor firmware descriptor\n");
|
|
|
|
success:
|
|
kfree(buf);
|
|
return true;
|
|
}
|
|
|
|
static void dlfb_init_framebuffer_work(struct work_struct *work);
|
|
|
|
static int dlfb_usb_probe(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct usb_device *usbdev;
|
|
struct dlfb_data *dev = NULL;
|
|
int retval = -ENOMEM;
|
|
|
|
/* usb initialization */
|
|
|
|
usbdev = interface_to_usbdev(interface);
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (dev == NULL) {
|
|
dev_err(&interface->dev, "dlfb_usb_probe: failed alloc of dev struct\n");
|
|
goto error;
|
|
}
|
|
|
|
kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */
|
|
|
|
dev->udev = usbdev;
|
|
dev->gdev = &usbdev->dev; /* our generic struct device * */
|
|
usb_set_intfdata(interface, dev);
|
|
|
|
pr_info("%s %s - serial #%s\n",
|
|
usbdev->manufacturer, usbdev->product, usbdev->serial);
|
|
pr_info("vid_%04x&pid_%04x&rev_%04x driver's dlfb_data struct at %p\n",
|
|
usbdev->descriptor.idVendor, usbdev->descriptor.idProduct,
|
|
usbdev->descriptor.bcdDevice, dev);
|
|
pr_info("console enable=%d\n", console);
|
|
pr_info("fb_defio enable=%d\n", fb_defio);
|
|
pr_info("shadow enable=%d\n", shadow);
|
|
|
|
dev->sku_pixel_limit = 2048 * 1152; /* default to maximum */
|
|
|
|
if (!dlfb_parse_vendor_descriptor(dev, interface)) {
|
|
pr_err("firmware not recognized. Assume incompatible device\n");
|
|
goto error;
|
|
}
|
|
|
|
if (pixel_limit) {
|
|
pr_warn("DL chip limit of %d overridden"
|
|
" by module param to %d\n",
|
|
dev->sku_pixel_limit, pixel_limit);
|
|
dev->sku_pixel_limit = pixel_limit;
|
|
}
|
|
|
|
|
|
if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
|
|
retval = -ENOMEM;
|
|
pr_err("dlfb_alloc_urb_list failed\n");
|
|
goto error;
|
|
}
|
|
|
|
kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */
|
|
|
|
/* We don't register a new USB class. Our client interface is fbdev */
|
|
|
|
/* Workitem keep things fast & simple during USB enumeration */
|
|
INIT_DELAYED_WORK(&dev->init_framebuffer_work,
|
|
dlfb_init_framebuffer_work);
|
|
schedule_delayed_work(&dev->init_framebuffer_work, 0);
|
|
|
|
return 0;
|
|
|
|
error:
|
|
if (dev) {
|
|
|
|
kref_put(&dev->kref, dlfb_free); /* ref for framebuffer */
|
|
kref_put(&dev->kref, dlfb_free); /* last ref from kref_init */
|
|
|
|
/* dev has been deallocated. Do not dereference */
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void dlfb_init_framebuffer_work(struct work_struct *work)
|
|
{
|
|
struct dlfb_data *dev = container_of(work, struct dlfb_data,
|
|
init_framebuffer_work.work);
|
|
struct fb_info *info;
|
|
int retval;
|
|
int i;
|
|
|
|
/* allocates framebuffer driver structure, not framebuffer memory */
|
|
info = framebuffer_alloc(0, dev->gdev);
|
|
if (!info) {
|
|
retval = -ENOMEM;
|
|
pr_err("framebuffer_alloc failed\n");
|
|
goto error;
|
|
}
|
|
|
|
dev->info = info;
|
|
info->par = dev;
|
|
info->pseudo_palette = dev->pseudo_palette;
|
|
info->fbops = &dlfb_ops;
|
|
|
|
retval = fb_alloc_cmap(&info->cmap, 256, 0);
|
|
if (retval < 0) {
|
|
pr_err("fb_alloc_cmap failed %x\n", retval);
|
|
goto error;
|
|
}
|
|
|
|
INIT_DELAYED_WORK(&dev->free_framebuffer_work,
|
|
dlfb_free_framebuffer_work);
|
|
|
|
INIT_LIST_HEAD(&info->modelist);
|
|
|
|
retval = dlfb_setup_modes(dev, info, NULL, 0);
|
|
if (retval != 0) {
|
|
pr_err("unable to find common mode for display and adapter\n");
|
|
goto error;
|
|
}
|
|
|
|
/* ready to begin using device */
|
|
|
|
atomic_set(&dev->usb_active, 1);
|
|
dlfb_select_std_channel(dev);
|
|
|
|
dlfb_ops_check_var(&info->var, info);
|
|
dlfb_ops_set_par(info);
|
|
|
|
retval = register_framebuffer(info);
|
|
if (retval < 0) {
|
|
pr_err("register_framebuffer failed %d\n", retval);
|
|
goto error;
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) {
|
|
retval = device_create_file(info->dev, &fb_device_attrs[i]);
|
|
if (retval) {
|
|
pr_warn("device_create_file failed %d\n", retval);
|
|
}
|
|
}
|
|
|
|
retval = device_create_bin_file(info->dev, &edid_attr);
|
|
if (retval) {
|
|
pr_warn("device_create_bin_file failed %d\n", retval);
|
|
}
|
|
|
|
pr_info("DisplayLink USB device /dev/fb%d attached. %dx%d resolution."
|
|
" Using %dK framebuffer memory\n", info->node,
|
|
info->var.xres, info->var.yres,
|
|
((dev->backing_buffer) ?
|
|
info->fix.smem_len * 2 : info->fix.smem_len) >> 10);
|
|
return;
|
|
|
|
error:
|
|
dlfb_free_framebuffer(dev);
|
|
}
|
|
|
|
static void dlfb_usb_disconnect(struct usb_interface *interface)
|
|
{
|
|
struct dlfb_data *dev;
|
|
struct fb_info *info;
|
|
int i;
|
|
|
|
dev = usb_get_intfdata(interface);
|
|
info = dev->info;
|
|
|
|
pr_info("USB disconnect starting\n");
|
|
|
|
/* we virtualize until all fb clients release. Then we free */
|
|
dev->virtualized = true;
|
|
|
|
/* When non-active we'll update virtual framebuffer, but no new urbs */
|
|
atomic_set(&dev->usb_active, 0);
|
|
|
|
/* this function will wait for all in-flight urbs to complete */
|
|
dlfb_free_urb_list(dev);
|
|
|
|
if (info) {
|
|
/* 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);
|
|
unlink_framebuffer(info);
|
|
}
|
|
|
|
usb_set_intfdata(interface, NULL);
|
|
dev->udev = NULL;
|
|
dev->gdev = NULL;
|
|
|
|
/* if clients still have us open, will be freed on last close */
|
|
if (dev->fb_count == 0)
|
|
schedule_delayed_work(&dev->free_framebuffer_work, 0);
|
|
|
|
/* release reference taken by kref_init in probe() */
|
|
kref_put(&dev->kref, dlfb_free);
|
|
|
|
/* consider dlfb_data freed */
|
|
|
|
return;
|
|
}
|
|
|
|
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 *dev = unode->dev;
|
|
unsigned long flags;
|
|
|
|
/* sync/async unlink faults aren't errors */
|
|
if (urb->status) {
|
|
if (!(urb->status == -ENOENT ||
|
|
urb->status == -ECONNRESET ||
|
|
urb->status == -ESHUTDOWN)) {
|
|
pr_err("%s - nonzero write bulk status received: %d\n",
|
|
__func__, urb->status);
|
|
atomic_set(&dev->lost_pixels, 1);
|
|
}
|
|
}
|
|
|
|
urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */
|
|
|
|
spin_lock_irqsave(&dev->urbs.lock, flags);
|
|
list_add_tail(&unode->entry, &dev->urbs.list);
|
|
dev->urbs.available++;
|
|
spin_unlock_irqrestore(&dev->urbs.lock, flags);
|
|
|
|
/*
|
|
* When using fb_defio, we deadlock if up() is called
|
|
* while another is waiting. So queue to another process.
|
|
*/
|
|
if (fb_defio)
|
|
schedule_delayed_work(&unode->release_urb_work, 0);
|
|
else
|
|
up(&dev->urbs.limit_sem);
|
|
}
|
|
|
|
static void dlfb_free_urb_list(struct dlfb_data *dev)
|
|
{
|
|
int count = dev->urbs.count;
|
|
struct list_head *node;
|
|
struct urb_node *unode;
|
|
struct urb *urb;
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
pr_notice("Freeing all render urbs\n");
|
|
|
|
/* keep waiting and freeing, until we've got 'em all */
|
|
while (count--) {
|
|
|
|
/* Getting interrupted means a leak, but ok at disconnect */
|
|
ret = down_interruptible(&dev->urbs.limit_sem);
|
|
if (ret)
|
|
break;
|
|
|
|
spin_lock_irqsave(&dev->urbs.lock, flags);
|
|
|
|
node = dev->urbs.list.next; /* have reserved one with sem */
|
|
list_del_init(node);
|
|
|
|
spin_unlock_irqrestore(&dev->urbs.lock, flags);
|
|
|
|
unode = list_entry(node, struct urb_node, entry);
|
|
urb = unode->urb;
|
|
|
|
/* Free each separately allocated piece */
|
|
usb_free_coherent(urb->dev, dev->urbs.size,
|
|
urb->transfer_buffer, urb->transfer_dma);
|
|
usb_free_urb(urb);
|
|
kfree(node);
|
|
}
|
|
|
|
dev->urbs.count = 0;
|
|
}
|
|
|
|
static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size)
|
|
{
|
|
int i = 0;
|
|
struct urb *urb;
|
|
struct urb_node *unode;
|
|
char *buf;
|
|
|
|
spin_lock_init(&dev->urbs.lock);
|
|
|
|
dev->urbs.size = size;
|
|
INIT_LIST_HEAD(&dev->urbs.list);
|
|
|
|
while (i < count) {
|
|
unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
|
|
if (!unode)
|
|
break;
|
|
unode->dev = dev;
|
|
|
|
INIT_DELAYED_WORK(&unode->release_urb_work,
|
|
dlfb_release_urb_work);
|
|
|
|
urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!urb) {
|
|
kfree(unode);
|
|
break;
|
|
}
|
|
unode->urb = urb;
|
|
|
|
buf = usb_alloc_coherent(dev->udev, MAX_TRANSFER, GFP_KERNEL,
|
|
&urb->transfer_dma);
|
|
if (!buf) {
|
|
kfree(unode);
|
|
usb_free_urb(urb);
|
|
break;
|
|
}
|
|
|
|
/* urb->transfer_buffer_length set to actual before submit */
|
|
usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1),
|
|
buf, size, dlfb_urb_completion, unode);
|
|
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
|
|
|
list_add_tail(&unode->entry, &dev->urbs.list);
|
|
|
|
i++;
|
|
}
|
|
|
|
sema_init(&dev->urbs.limit_sem, i);
|
|
dev->urbs.count = i;
|
|
dev->urbs.available = i;
|
|
|
|
pr_notice("allocated %d %d byte urbs\n", i, (int) size);
|
|
|
|
return i;
|
|
}
|
|
|
|
static struct urb *dlfb_get_urb(struct dlfb_data *dev)
|
|
{
|
|
int ret = 0;
|
|
struct list_head *entry;
|
|
struct urb_node *unode;
|
|
struct urb *urb = NULL;
|
|
unsigned long flags;
|
|
|
|
/* Wait for an in-flight buffer to complete and get re-queued */
|
|
ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT);
|
|
if (ret) {
|
|
atomic_set(&dev->lost_pixels, 1);
|
|
pr_warn("wait for urb interrupted: %x available: %d\n",
|
|
ret, dev->urbs.available);
|
|
goto error;
|
|
}
|
|
|
|
spin_lock_irqsave(&dev->urbs.lock, flags);
|
|
|
|
BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */
|
|
entry = dev->urbs.list.next;
|
|
list_del_init(entry);
|
|
dev->urbs.available--;
|
|
|
|
spin_unlock_irqrestore(&dev->urbs.lock, flags);
|
|
|
|
unode = list_entry(entry, struct urb_node, entry);
|
|
urb = unode->urb;
|
|
|
|
error:
|
|
return urb;
|
|
}
|
|
|
|
static int dlfb_submit_urb(struct dlfb_data *dev, struct urb *urb, size_t len)
|
|
{
|
|
int ret;
|
|
|
|
BUG_ON(len > dev->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(&dev->lost_pixels, 1);
|
|
pr_err("usb_submit_urb error %x\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");
|
|
|