-/*****************************************************************************
- * DLFB Kernel Driver *
- * Version 0.2 (udlfb) *
- * (C) 2009 Roberto De Ioris <roberto@unbit.it> *
- * *
- * This file is licensed under the GPLv2. See COPYING in the package. *
- * Based on the amazing work of Florian Echtler and libdlo 0.1 *
- * *
- * *
- * 10.06.09 release 0.2.3 (edid ioctl, fallback for unsupported modes) *
- * 05.06.09 release 0.2.2 (real screen blanking, rle compression, double buffer) *
- * 31.05.09 release 0.2 *
- * 22.05.09 First public (ugly) release *
- *****************************************************************************/
+/*
+ * 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>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License v2. See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,
+ * usb-skeleton by GregKH.
+ *
+ * Device-specific portions based on information from Displaylink, with work
+ * from Florian Echtler, Henrik Bjerregaard Pedersen, and others.
+ */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/mutex.h>
+#include <linux/vmalloc.h>
#include "udlfb.h"
-#define DRIVER_VERSION "DLFB 0.2"
+#define DRIVER_VERSION "DisplayLink Framebuffer Driver 0.4.1"
-/* memory functions taken from vfb */
+static struct fb_fix_screeninfo dlfb_fix = {
+ .id = "displaylinkfb",
+ .type = FB_TYPE_PACKED_PIXELS,
+ .visual = FB_VISUAL_TRUECOLOR,
+ .xpanstep = 0,
+ .ypanstep = 0,
+ .ywrapstep = 0,
+ .accel = FB_ACCEL_NONE,
+};
-static void *rvmalloc(unsigned long size)
+/*
+ * There are many DisplayLink-based products, all with unique PIDs. We are able
+ * to support all volume ones (circa 2009) with a single driver, so we match
+ * globally on VID. TODO: Probe() needs to detect when we might be running
+ * "future" chips, and bail on those, so a compatible driver can match.
+ */
+static struct usb_device_id id_table[] = {
+ {.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,},
+ {},
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+/* dlfb keeps a list of urbs for efficient bulk transfers */
+static void dlfb_urb_completion(struct urb *urb);
+static struct urb *dlfb_get_urb(struct dlfb_data *dev);
+static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len);
+static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size);
+static void dlfb_free_urb_list(struct dlfb_data *dev);
+
+/*
+ * Inserts a specific DisplayLink controller command into the provided
+ * buffer.
+ */
+static char *dlfb_set_register(char *buf, u8 reg, u8 val)
{
- void *mem;
- unsigned long adr;
+ *buf++ = 0xAF;
+ *buf++ = 0x20;
+ *buf++ = reg;
+ *buf++ = val;
+ return buf;
+}
- size = PAGE_ALIGN(size);
- mem = vmalloc_32(size);
- if (!mem)
- return NULL;
+static char *dlfb_vidreg_lock(char *buf)
+{
+ return dlfb_set_register(buf, 0xFF, 0x00);
+}
- memset(mem, 0, size); /* Clear the ram out, no junk to the user */
- adr = (unsigned long)mem;
- while (size > 0) {
- SetPageReserved(vmalloc_to_page((void *)adr));
- adr += PAGE_SIZE;
- size -= PAGE_SIZE;
+static char *dlfb_vidreg_unlock(char *buf)
+{
+ return dlfb_set_register(buf, 0xFF, 0xFF);
+}
+
+/*
+ * Once you send this command, the DisplayLink framebuffer gets driven to the
+ * display.
+ */
+static char *dlfb_enable_hvsync(char *buf)
+{
+ return dlfb_set_register(buf, 0x1F, 0x00);
+}
+
+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);
+}
+
+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 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 mem;
+ 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, lfsr16(value));
}
-static void rvfree(void *mem, unsigned long size)
+/*
+ * 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)
{
- unsigned long adr;
+ 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);
- if (!mem)
- return;
+ /* hsync end is width of sync pulse + 1 */
+ wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1);
- adr = (unsigned long)mem;
- while ((long)size > 0) {
- ClearPageReserved(vmalloc_to_page((void *)adr));
- adr += PAGE_SIZE;
- size -= PAGE_SIZE;
+ /* hpixels is active pixels */
+ wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres);
+
+ /* yendcount is vertical active + vertical blanking */
+ yec = var->yres + var->upper_margin + var->lower_margin +
+ var->vsync_len;
+ wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec);
+
+ /* libdlo hardcodes vsync start to 0 */
+ wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0);
+
+ /* vsync end is width of vsync pulse */
+ wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len);
+
+ /* vpixels is active pixels */
+ wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres);
+
+ /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */
+ wrptr = dlfb_set_register_16be(wrptr, 0x1B,
+ 200*1000*1000/var->pixclock);
+
+ return wrptr;
+}
+
+/*
+ * This takes a standard fbdev screeninfo struct that was fetched or prepared
+ * and then generates the appropriate command sequence that then drives the
+ * display controller.
+ */
+static int dlfb_set_video_mode(struct dlfb_data *dev,
+ struct fb_var_screeninfo *var)
+{
+ char *buf;
+ char *wrptr;
+ int retval = 0;
+ int writesize;
+
+ buf = dev->buf;
+
+ /*
+ * This first section has to do with setting the base address on the
+ * controller * associated with the display. There are 2 base
+ * pointers, currently, we only * use the 16 bpp segment.
+ */
+ wrptr = dlfb_vidreg_lock(buf);
+ wrptr = dlfb_set_color_depth(wrptr, 0x00);
+ /* set base for 16bpp segment to 0 */
+ wrptr = dlfb_set_base16bpp(wrptr, 0);
+ /* set base for 8bpp segment to end of fb */
+ wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len);
+
+ wrptr = dlfb_set_vid_cmds(wrptr, var);
+ wrptr = dlfb_enable_hvsync(wrptr);
+ wrptr = dlfb_vidreg_unlock(wrptr);
+
+ writesize = wrptr - buf;
+
+ mutex_lock(&dev->bulk_mutex);
+ if (!dev->interface) { /* disconnect() was called */
+ mutex_unlock(&dev->bulk_mutex);
+ retval = -ENODEV;
+ goto error;
}
- vfree(mem);
+
+ retval = dlfb_bulk_msg(dev, writesize);
+ mutex_unlock(&dev->bulk_mutex);
+ if (retval) {
+ dev_err(&dev->udev->dev, "Problem %d with submit write bulk.\n",
+ retval);
+ goto error;
+ }
+
+ return 0;
+
+error:
+ return retval;
+}
+
+
+/*
+ * Query EDID from the handware, then hand it off to fbdev's edid parse
+ * routine which should give us back a filled in screeninfo structure.
+ */
+static int dlfb_get_var_from_edid(struct dlfb_data *dev,
+ struct fb_var_screeninfo *var)
+{
+ int ret;
+
+ dlfb_edid(dev);
+ ret = fb_parse_edid(dev->edid, var);
+
+ return ret;
}
-static int dlfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
+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;
int x2, y2;
};
-/*
-static struct usb_device_id id_table [] = {
- { USB_DEVICE(0x17e9, 0x023d) },
- { }
-};
-*/
-
-static struct usb_device_id id_table[] = {
- {.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,},
- {},
-};
-MODULE_DEVICE_TABLE(usb, id_table);
-
static struct usb_driver dlfb_driver;
-// thanks to Henrik Bjerregaard Pedersen for this function
+/* thanks to Henrik Bjerregaard Pedersen for this function */
static char *rle_compress16(uint16_t * src, char *dst, int rem)
{
uint16_t pix0;
char *end_if_raw = dst + 6 + 2 * rem;
- dst += 6; // header will be filled in if RLE is worth it
+ dst += 6; /* header will be filled in if RLE is worth it */
while (rem && dst < end_if_raw) {
char *start = (char *)src;
}
/*
-Thanks to Henrik Bjerregaard Pedersen for rle implementation and code refactoring.
-Next step is huffman compression.
+Thanks to Henrik Bjerregaard Pedersen for rle implementation
+and code refactoring. Next step is huffman compression.
*/
static int
bufptr - dev_info->buf);
bufptr = dev_info->buf;
}
- // number of pixels to consider this time
+ /* number of pixels to consider this time */
thistime = rem;
if (thistime > 255)
thistime = 255;
- // find position of first pixel that has changed
- firstdiff = -1;
- for (j = 0; j < thistime * 2; j++) {
- if (dev_info->backing_buffer
- [base - dev_info->base16 + j] != data[j]) {
- firstdiff = j / 2;
- break;
+ if (dev_info->backing_buffer) {
+ /* find first pixel that has changed */
+ firstdiff = -1;
+ for (j = 0; j < thistime * 2; j++) {
+ if (dev_info->backing_buffer
+ [base - dev_info->base16 + j]
+ != data[j]) {
+ firstdiff = j / 2;
+ break;
+ }
}
+
+ } else {
+ firstdiff = 0;
+
}
if (firstdiff >= 0) {
bufptr = end_of_rle;
} else {
- // fallback to raw (or some other encoding?)
+ /* fallback to raw (or other?) */
*bufptr++ = 0xAF;
*bufptr++ = 0x68;
*bufptr++ =
(char)(base + firstdiff * 2);
*bufptr++ = thistime - firstdiff;
- // PUT COMPRESSION HERE
for (j = firstdiff * 2;
j < thistime * 2; j += 2) {
*bufptr++ = data[j + 1];
rem -= thistime;
}
- memcpy(dev_info->backing_buffer + (base - dev_info->base16) -
- (width * 2), data - (width * 2), width * 2);
+ if (dev_info->backing_buffer)
+ memcpy(dev_info->backing_buffer +
+ (base - dev_info->base16) -
+ (width * 2), data - (width * 2), width * 2);
base += (dev_info->info->var.xres * 2) - (width * 2);
data += (dev_info->info->var.xres * 2) - (width * 2);
for (i = y; i < y + height; i++) {
- for (j = 0; j < width * 2; j += 2) {
- dev_info->backing_buffer[base - dev_info->base16 + j] =
- (char)(col >> 8);
- dev_info->backing_buffer[base - dev_info->base16 + j +
- 1] = (char)(col);
+ if (dev_info->backing_buffer) {
+ for (j = 0; j < width * 2; j += 2) {
+ dev_info->backing_buffer
+ [base - dev_info->base16 + j] =
+ (char)(col >> 8);
+ dev_info->backing_buffer
+ [base - dev_info->base16 + j + 1] =
+ (char)(col);
+ }
}
+
if (dev_info->bufend - bufptr < BUF_HIGH_WATER_MARK) {
ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
bufptr = dev_info->buf;
bufptr = dlfb_set_register(bufptr, 0xFF, 0x00);
- // set addresses
+ /* set addresses */
bufptr =
dlfb_set_register(bufptr, 0x20, (char)(dev_info->base16 >> 16));
bufptr = dlfb_set_register(bufptr, 0x21, (char)(dev_info->base16 >> 8));
return 1;
}
-static void dlfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
+static void dlfb_ops_copyarea(struct fb_info *info,
+ const struct fb_copyarea *area)
{
-
struct dlfb_data *dev = info->par;
copyarea(dev, area->dx, area->dy, area->sx, area->sy, area->width,
area->height);
-
- /* printk("COPY AREA %d %d %d %d %d %d !!!\n", area->dx, area->dy, area->sx, area->sy, area->width, area->height); */
-
}
-static void dlfb_imageblit(struct fb_info *info, const struct fb_image *image)
+static void dlfb_ops_imageblit(struct fb_info *info,
+ const struct fb_image *image)
{
-
int ret;
struct dlfb_data *dev = info->par;
- /* printk("IMAGE BLIT (1) %d %d %d %d DEPTH %d {%p}!!!\n", image->dx, image->dy, image->width, image->height, image->depth, dev->udev); */
cfb_imageblit(info, image);
ret =
image_blit(dev, image->dx, image->dy, image->width, image->height,
info->screen_base);
- /* printk("IMAGE BLIT (2) %d %d %d %d DEPTH %d {%p} %d!!!\n", image->dx, image->dy, image->width, image->height, image->depth, dev->udev, ret); */
}
-static void dlfb_fillrect(struct fb_info *info,
+static void dlfb_ops_fillrect(struct fb_info *info,
const struct fb_fillrect *region)
{
}
-static int dlfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
+static void dlfb_get_edid(struct dlfb_data *dev)
{
+ int i;
+ int ret;
+ char rbuf[2];
+
+ for (i = 0; i < sizeof(dev->edid); i++) {
+ ret = usb_control_msg(dev->udev,
+ usb_rcvctrlpipe(dev->udev, 0), (0x02),
+ (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
+ 0);
+ dev->edid[i] = rbuf[1];
+ }
+}
+static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd,
+ unsigned long arg)
+{
struct dlfb_data *dev_info = info->par;
struct dloarea *area = NULL;
}
/* taken from vesafb */
-
static int
-dlfb_setcolreg(unsigned regno, unsigned red, unsigned green,
+dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp, struct fb_info *info)
{
int err = 0;
return err;
}
-static int dlfb_release(struct fb_info *info, int user)
+static int dlfb_ops_release(struct fb_info *info, int user)
{
struct dlfb_data *dev_info = info->par;
image_blit(dev_info, 0, 0, info->var.xres, info->var.yres,
return 0;
}
-static int dlfb_blank(int blank_mode, struct fb_info *info)
+/*
+ * 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_delete(struct kref *kref)
+{
+ struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref);
+
+ if (dev->backing_buffer)
+ vfree(dev->backing_buffer);
+
+ kfree(dev);
+}
+
+/*
+ * 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)
+ 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_blank(int blank_mode, struct fb_info *info)
{
struct dlfb_data *dev_info = info->par;
char *bufptr = dev_info->buf;
}
static struct fb_ops dlfb_ops = {
- .fb_setcolreg = dlfb_setcolreg,
- .fb_fillrect = dlfb_fillrect,
- .fb_copyarea = dlfb_copyarea,
- .fb_imageblit = dlfb_imageblit,
- .fb_mmap = dlfb_mmap,
- .fb_ioctl = dlfb_ioctl,
- .fb_release = dlfb_release,
- .fb_blank = dlfb_blank,
+ .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_release = dlfb_ops_release,
+ .fb_blank = dlfb_ops_blank,
};
-static int
-dlfb_probe(struct usb_interface *interface, const struct usb_device_id *id)
+/*
+ * Calls dlfb_get_edid() to query the EDID of attached monitor via usb cmds
+ * Then 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 EDID parses successfully
+ */
+static int dlfb_parse_edid(struct dlfb_data *dev,
+ struct fb_var_screeninfo *var,
+ struct fb_info *info)
{
- struct dlfb_data *dev_info;
- struct fb_info *info;
+ int i;
+ const struct fb_videomode *default_vmode = NULL;
+ int result = 0;
- int ret;
- char rbuf[4];
+ fb_destroy_modelist(&info->modelist);
+ memset(&info->monspecs, 0, sizeof(info->monspecs));
- dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
- if (dev_info == NULL) {
- printk("cannot allocate dev_info structure.\n");
- return -ENOMEM;
- }
+ dlfb_get_edid(dev);
+ fb_edid_to_monspecs(dev->edid, &info->monspecs);
- mutex_init(&dev_info->bulk_mutex);
+ if (info->monspecs.modedb_len > 0) {
- dev_info->udev = usb_get_dev(interface_to_usbdev(interface));
- dev_info->interface = interface;
+ 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);
+ }
- printk("DisplayLink device attached\n");
+ default_vmode = fb_find_best_display(&info->monspecs,
+ &info->modelist);
+ } else {
+ struct fb_videomode fb_vmode = {0};
+
+ dl_err("Unable to get valid EDID from device/display\n");
+ result = 1;
+
+ /*
+ * 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);
+ }
- /* add framebuffer info to usb interface */
- usb_set_intfdata(interface, dev_info);
+ /*
+ * 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);
+ }
- dev_info->buf = kmalloc(BUF_SIZE, GFP_KERNEL);
- /* usb_buffer_alloc(dev_info->udev, BUF_SIZE , GFP_KERNEL, &dev_info->tx_urb->transfer_dma); */
+ fb_videomode_to_var(var, default_vmode);
+ dlfb_var_color_format(var);
- if (dev_info->buf == NULL) {
- printk("unable to allocate memory for dlfb commands\n");
- goto out;
- }
- dev_info->bufend = dev_info->buf + BUF_SIZE;
+ return result;
+}
- dev_info->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
- usb_fill_bulk_urb(dev_info->tx_urb, dev_info->udev,
- usb_sndbulkpipe(dev_info->udev, 1), dev_info->buf, 0,
- dlfb_bulk_callback, dev_info);
+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));
+}
- ret =
- usb_control_msg(dev_info->udev, usb_rcvctrlpipe(dev_info->udev, 0),
- (0x06), (0x80 | (0x02 << 5)), 0, 0, rbuf, 4, 0);
- printk("ret control msg 0: %d %x%x%x%x\n", ret, rbuf[0], rbuf[1],
- rbuf[2], rbuf[3]);
+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));
+}
- dlfb_edid(dev_info);
+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));
+}
- info = framebuffer_alloc(sizeof(u32) * 256, &dev_info->udev->dev);
+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));
+}
- if (!info) {
- printk("non posso allocare il framebuffer displaylink");
- goto out;
- }
+static ssize_t metrics_misc_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,
+ "Calls to\ndamage: %u\nblit: %u\n"
+ "defio faults: %u\ncopy: %u\n"
+ "fill: %u\n\n"
+ "active framebuffer clients: %d\n"
+ "urbs available %d(%d)\n"
+ "Shadow framebuffer in use? %s\n"
+ "Any lost pixels? %s\n",
+ atomic_read(&dev->damage_count),
+ atomic_read(&dev->blit_count),
+ atomic_read(&dev->defio_fault_count),
+ atomic_read(&dev->copy_count),
+ atomic_read(&dev->fill_count),
+ dev->fb_count,
+ dev->urbs.available, dev->urbs.limit_sem.count,
+ (dev->backing_buffer) ? "yes" : "no",
+ atomic_read(&dev->lost_pixels) ? "yes" : "no");
+}
- fb_parse_edid(dev_info->edid, &info->var);
+static ssize_t edid_show(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;
+ char *edid = &dev->edid[0];
+ const size_t size = sizeof(dev->edid);
- printk("EDID XRES %d YRES %d\n", info->var.xres, info->var.yres);
+ if (dlfb_parse_edid(dev, &fb_info->var, fb_info))
+ return 0;
- if (dlfb_set_video_mode(dev_info, info->var.xres, info->var.yres) != 0) {
- info->var.xres = 1280;
- info->var.yres = 1024;
- if (dlfb_set_video_mode
- (dev_info, info->var.xres, info->var.yres) != 0) {
- goto out;
- }
- }
+ if (off >= size)
+ return 0;
- printk("found valid mode...%d\n", info->var.pixclock);
+ if (off + count > size)
+ count = size - off;
+ memcpy(buf, edid + off, count);
- info->pseudo_palette = info->par;
- info->par = dev_info;
+ return count;
+}
- dev_info->info = info;
- info->flags =
- FBINFO_DEFAULT | FBINFO_READS_FAST | FBINFO_HWACCEL_IMAGEBLIT |
- FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT;
- info->fbops = &dlfb_ops;
- info->screen_base = rvmalloc(dev_info->screen_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);
+ atomic_set(&dev->blit_count, 0);
+ atomic_set(&dev->copy_count, 0);
+ atomic_set(&dev->fill_count, 0);
+ atomic_set(&dev->defio_fault_count, 0);
+ atomic_set(&dev->damage_count, 0);
+
+ return count;
+}
- if (info->screen_base == NULL) {
- printk
- ("cannot allocate framebuffer virtual memory of %d bytes\n",
- dev_info->screen_size);
- goto out0;
+static ssize_t use_defio_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, "%d\n",
+ atomic_read(&dev->use_defio));
+}
+
+static ssize_t use_defio_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;
+
+ if (count > 0) {
+ if (buf[0] == '0')
+ atomic_set(&dev->use_defio, 0);
+ if (buf[0] == '1')
+ atomic_set(&dev->use_defio, 1);
}
+ return count;
+}
- printk("screen base allocated !!!\n");
+static struct bin_attribute edid_attr = {
+ .attr.name = "edid",
+ .attr.mode = 0444,
+ .size = 128,
+ .read = edid_show,
+};
+
+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_RO(metrics_misc),
+ __ATTR(metrics_reset, S_IWUGO, NULL, metrics_reset_store),
+ __ATTR_RW(use_defio),
+};
- dev_info->backing_buffer = kzalloc(dev_info->screen_size, GFP_KERNEL);
+/*
+ * 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;
+}
- if (!dev_info->backing_buffer)
- printk("non posso allocare il backing buffer\n");
+static int dlfb_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct device *mydev;
+ struct usb_device *usbdev;
+ struct dlfb_data *dev;
+ struct fb_info *info;
+ int videomemorysize;
+ unsigned char *videomemory;
+ int retval = -ENOMEM;
+ struct fb_var_screeninfo *var;
+ struct fb_bitfield red = { 11, 5, 0 };
+ struct fb_bitfield green = { 5, 6, 0 };
+ struct fb_bitfield blue = { 0, 5, 0 };
+
+ usbdev = usb_get_dev(interface_to_usbdev(interface));
+ mydev = &usbdev->dev;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (dev == NULL) {
+ dev_err(mydev, "failed alloc of dev struct\n");
+ goto err_devalloc;
+ }
- /* info->var = dev_info->si; */
+ mutex_init(&dev->bulk_mutex);
+ dev->udev = usbdev;
+ dev->gdev = &usbdev->dev; /* our generic struct device * */
+ dev->interface = interface;
+ usb_set_intfdata(interface, dev);
+
+ dev_info(mydev, "dlfb_probe: setting up DisplayLink device\n");
+
+ /*
+ * TODO: replace single 64K buffer with buffer list
+ * and async dispatch
+ */
+ dev->buf = kmalloc(BUF_SIZE, GFP_KERNEL);
+ if (dev->buf == NULL) {
+ dev_err(mydev, "unable to allocate memory for dlfb commands\n");
+ goto err_usballoc;
+ }
+ dev->bufend = dev->buf + BUF_SIZE;
+
+ dev->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
+ usb_fill_bulk_urb(dev->tx_urb, dev->udev,
+ usb_sndbulkpipe(dev->udev, 1), dev->buf, 0,
+ dlfb_bulk_callback, dev);
+
+ /* allocates framebuffer driver structure, not framebuffer memory */
+ info = framebuffer_alloc(0, mydev);
+ if (!info)
+ goto err_fballoc;
+
+ dev->info = info;
+ info->par = dev;
+ info->pseudo_palette = dev->pseudo_palette;
+
+ var = &info->var;
+ retval = dlfb_get_var_from_edid(dev, var);
+ if (retval) {
+ /* had a problem getting edid. so fallback to 640x480 */
+ dev_err(mydev, "Problem %d with EDID.\n", retval);
+ var->xres = 640;
+ var->yres = 480;
+ }
+ /*
+ * ok, now that we've got the size info, we can alloc our framebuffer.
+ * We are using 16bpp.
+ */
info->var.bits_per_pixel = 16;
- info->var.activate = FB_ACTIVATE_TEST;
- info->var.vmode = FB_VMODE_NONINTERLACED;
+ info->fix = dlfb_fix;
+ info->fix.line_length = var->xres * (var->bits_per_pixel / 8);
+ videomemorysize = info->fix.line_length * var->yres;
+
+ /*
+ * The big chunk of system memory we use as a virtual framebuffer.
+ * Pages don't need to be set RESERVED (non-swap) immediately on 2.6
+ * remap_pfn_page() syscall in our mmap and/or defio will handle.
+ */
+ videomemory = vmalloc(videomemorysize);
+ if (!videomemory)
+ goto err_vidmem;
+ memset(videomemory, 0, videomemorysize);
+
+ info->screen_base = videomemory;
+ info->fix.smem_len = PAGE_ALIGN(videomemorysize);
+ info->fix.smem_start = (unsigned long) videomemory;
+ info->flags =
+ FBINFO_DEFAULT | FBINFO_READS_FAST | FBINFO_HWACCEL_IMAGEBLIT |
+ FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT;
+
+ /*
+ * Second framebuffer copy, mirroring the state of the framebuffer
+ * on the physical USB device. We can function without this.
+ * But with imperfect damage info we may end up sending pixels over USB
+ * that were, in fact, unchanged -- wasting limited USB bandwidth
+ */
+ dev->backing_buffer = vmalloc(dev->screen_size);
+ if (!dev->backing_buffer)
+ dev_info(mydev, "No backing buffer allocated!\n");
- info->var.red.offset = 11;
- info->var.red.length = 5;
- info->var.red.msb_right = 0;
+ info->fbops = &dlfb_ops;
- info->var.green.offset = 5;
- info->var.green.length = 6;
- info->var.green.msb_right = 0;
+ var->vmode = FB_VMODE_NONINTERLACED;
+ var->red = red;
+ var->green = green;
+ var->blue = blue;
- info->var.blue.offset = 0;
- info->var.blue.length = 5;
- info->var.blue.msb_right = 0;
+ /*
+ * TODO: Enable FB_CONFIG_DEFIO support
- /* info->var.pixclock = (10000000 / FB_W * 1000 / FB_H)/2 ; */
+ info->fbdefio = &dlfb_defio;
+ fb_deferred_io_init(info);
- info->fix.smem_start = (unsigned long)info->screen_base;
- info->fix.smem_len = PAGE_ALIGN(dev_info->screen_size);
- if (strlen(dev_info->udev->product) > 15) {
- memcpy(info->fix.id, dev_info->udev->product, 15);
- } else {
- memcpy(info->fix.id, dev_info->udev->product,
- strlen(dev_info->udev->product));
+ */
+
+ retval = fb_alloc_cmap(&info->cmap, 256, 0);
+ if (retval < 0) {
+ dev_err(mydev, "Failed to allocate colormap\n");
+ goto err_cmap;
}
- info->fix.type = FB_TYPE_PACKED_PIXELS;
- info->fix.visual = FB_VISUAL_TRUECOLOR;
- info->fix.accel = info->flags;
- info->fix.line_length = dev_info->line_length;
- if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
- goto out1;
+ dlfb_select_std_channel(dev);
+ dlfb_set_video_mode(dev, var);
+ /* TODO: dlfb_dpy_update(dev); */
- printk("colormap allocated\n");
- if (register_framebuffer(info) < 0)
- goto out2;
+ retval = register_framebuffer(info);
+ if (retval < 0)
+ goto err_regfb;
- draw_rect(dev_info, 0, 0, dev_info->info->var.xres,
- dev_info->info->var.yres, 0x30, 0xff, 0x30);
+ /* paint "successful" green screen */
+ draw_rect(dev, 0, 0, dev->info->var.xres,
+ dev->info->var.yres, 0x30, 0xff, 0x30);
+ dev_info(mydev, "DisplayLink USB device %d now attached, "
+ "using %dK of memory\n", info->node,
+ ((dev->backing_buffer) ?
+ videomemorysize * 2 : videomemorysize) >> 10);
return 0;
-out2:
+err_regfb:
fb_dealloc_cmap(&info->cmap);
-out1:
- rvfree(info->screen_base, dev_info->screen_size);
-out0:
+err_cmap:
+ /* TODO: fb_deferred_io_cleanup(info); */
+ vfree(videomemory);
+err_vidmem:
framebuffer_release(info);
-out:
+err_fballoc:
+ kfree(dev->buf);
+err_usballoc:
usb_set_intfdata(interface, NULL);
- usb_put_dev(dev_info->udev);
- kfree(dev_info);
- return -ENOMEM;
-
+ usb_put_dev(dev->udev);
+ kfree(dev);
+err_devalloc:
+ return retval;
}
static void dlfb_disconnect(struct usb_interface *interface)
{
- struct dlfb_data *dev_info = usb_get_intfdata(interface);
-
- mutex_unlock(&dev_info->bulk_mutex);
+ struct dlfb_data *dev;
+ struct fb_info *info;
- usb_kill_urb(dev_info->tx_urb);
- usb_free_urb(dev_info->tx_urb);
+ dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
- usb_put_dev(dev_info->udev);
-
- if (dev_info->info) {
- unregister_framebuffer(dev_info->info);
- fb_dealloc_cmap(&dev_info->info->cmap);
- rvfree(dev_info->info->screen_base, dev_info->screen_size);
- kfree(dev_info->backing_buffer);
- framebuffer_release(dev_info->info);
-
+ usb_put_dev(dev->udev);
+
+ /*
+ * TODO: since, upon usb disconnect(), usb will cancel in-flight urbs
+ * and error out any new ones, look at eliminating need for mutex
+ */
+ mutex_lock(&dev->bulk_mutex);
+ dev->interface = NULL;
+ info = dev->info;
+ mutex_unlock(&dev->bulk_mutex);
+
+ if (info) {
+ dev_info(&interface->dev, "Detaching DisplayLink device %d.\n",
+ info->node);
+ unregister_framebuffer(info);
+ fb_dealloc_cmap(&info->cmap);
+ /* TODO: fb_deferred_io_cleanup(info); */
+ fb_dealloc_cmap(&info->cmap);
+ vfree((void __force *)info->screen_base);
+ framebuffer_release(info);
}
- kfree(dev_info);
+ if (dev->backing_buffer)
+ vfree(dev->backing_buffer);
- printk("DisplayLink device disconnected\n");
+ kfree(dev);
}
static struct usb_driver dlfb_driver = {
{
int res;
- dlfb_init_modes();
-
res = usb_register(&dlfb_driver);
if (res)
err("usb_register failed. Error number %d", res);
module_init(dlfb_init);
module_exit(dlfb_exit);
-MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>");
+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)) {
+ dl_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);
+
+ 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;
+
+ dl_notice("Waiting for completes and freeing all render urbs\n");
+
+ /* keep waiting and freeing, until we've got 'em all */
+ while (count--) {
+ /* Timeout means a memory leak and/or fault */
+ ret = down_timeout(&dev->urbs.limit_sem, FREE_URB_TIMEOUT);
+ if (ret) {
+ BUG_ON(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_buffer_free(urb->dev, dev->urbs.size,
+ urb->transfer_buffer, urb->transfer_dma);
+ usb_free_urb(urb);
+ kfree(node);
+ }
+
+ kref_put(&dev->kref, dlfb_delete);
+
+}
+
+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;
+
+ urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!urb) {
+ kfree(unode);
+ break;
+ }
+ unode->urb = urb;
+
+ buf = usb_buffer_alloc(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;
+
+ kref_get(&dev->kref); /* released in free_render_urbs() */
+
+ dl_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);
+ dl_err("wait for urb interrupted: %x\n", ret);
+ 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);
+ dl_err("usb_submit_urb error %x\n", ret);
+ }
+ return ret;
+}
+
+MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, "
+ "Jaya Kumar <jayakumar.lkml@gmail.com>");
MODULE_DESCRIPTION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
projects / mirror_ubuntu-jammy-kernel.git / blobdiff