diff options
Diffstat (limited to 'kernel/drivers/video/fbdev/udlfb.c')
| -rw-r--r-- | kernel/drivers/video/fbdev/udlfb.c | 1979 |
1 files changed, 1979 insertions, 0 deletions
diff --git a/kernel/drivers/video/fbdev/udlfb.c b/kernel/drivers/video/fbdev/udlfb.c new file mode 100644 index 000000000..ff2b8731a --- /dev/null +++ b/kernel/drivers/video/fbdev/udlfb.c @@ -0,0 +1,1979 @@ +/* + * udlfb.c -- Framebuffer driver for DisplayLink USB controller + * + * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it> + * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com> + * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com> + * + * This file is subject to the terms and conditions of the GNU General Public + * License v2. See the file COPYING in the main directory of this archive for + * more details. + * + * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven, + * usb-skeleton by GregKH. + * + * Device-specific portions based on information from Displaylink, with work + * from Florian Echtler, Henrik Bjerregaard Pedersen, and others. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/usb.h> +#include <linux/uaccess.h> +#include <linux/mm.h> +#include <linux/fb.h> +#include <linux/vmalloc.h> +#include <linux/slab.h> +#include <linux/prefetch.h> +#include <linux/delay.h> +#include <video/udlfb.h> +#include "edid.h" + +static struct fb_fix_screeninfo dlfb_fix = { + .id = "udlfb", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_TRUECOLOR, + .xpanstep = 0, + .ypanstep = 0, + .ywrapstep = 0, + .accel = FB_ACCEL_NONE, +}; + +static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | + FBINFO_VIRTFB | + FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | + FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; + +/* + * There are many DisplayLink-based graphics products, all with unique PIDs. + * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) + * We also require a match on SubClass (0x00) and Protocol (0x00), + * which is compatible with all known USB 2.0 era graphics chips and firmware, + * but allows DisplayLink to increment those for any future incompatible chips + */ +static struct usb_device_id id_table[] = { + {.idVendor = 0x17e9, + .bInterfaceClass = 0xff, + .bInterfaceSubClass = 0x00, + .bInterfaceProtocol = 0x00, + .match_flags = USB_DEVICE_ID_MATCH_VENDOR | + USB_DEVICE_ID_MATCH_INT_CLASS | + USB_DEVICE_ID_MATCH_INT_SUBCLASS | + USB_DEVICE_ID_MATCH_INT_PROTOCOL, + }, + {}, +}; +MODULE_DEVICE_TABLE(usb, id_table); + +/* module options */ +static bool console = 1; /* Allow fbcon to open framebuffer */ +static bool fb_defio = 1; /* Detect mmap writes using page faults */ +static bool shadow = 1; /* Optionally disable shadow framebuffer */ +static int pixel_limit; /* Optionally force a pixel resolution limit */ + +/* dlfb keeps a list of urbs for efficient bulk transfers */ +static void dlfb_urb_completion(struct urb *urb); +static struct urb *dlfb_get_urb(struct dlfb_data *dev); +static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len); +static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size); +static void dlfb_free_urb_list(struct dlfb_data *dev); + +/* + * All DisplayLink bulk operations start with 0xAF, followed by specific code + * All operations are written to buffers which then later get sent to device + */ +static char *dlfb_set_register(char *buf, u8 reg, u8 val) +{ + *buf++ = 0xAF; + *buf++ = 0x20; + *buf++ = reg; + *buf++ = val; + return buf; +} + +static char *dlfb_vidreg_lock(char *buf) +{ + return dlfb_set_register(buf, 0xFF, 0x00); +} + +static char *dlfb_vidreg_unlock(char *buf) +{ + return dlfb_set_register(buf, 0xFF, 0xFF); +} + +/* + * Map FB_BLANK_* to DisplayLink register + * DLReg FB_BLANK_* + * ----- ----------------------------- + * 0x00 FB_BLANK_UNBLANK (0) + * 0x01 FB_BLANK (1) + * 0x03 FB_BLANK_VSYNC_SUSPEND (2) + * 0x05 FB_BLANK_HSYNC_SUSPEND (3) + * 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back + */ +static char *dlfb_blanking(char *buf, int fb_blank) +{ + u8 reg; + + switch (fb_blank) { + case FB_BLANK_POWERDOWN: + reg = 0x07; + break; + case FB_BLANK_HSYNC_SUSPEND: + reg = 0x05; + break; + case FB_BLANK_VSYNC_SUSPEND: + reg = 0x03; + break; + case FB_BLANK_NORMAL: + reg = 0x01; + break; + default: + reg = 0x00; + } + + buf = dlfb_set_register(buf, 0x1F, reg); + + return buf; +} + +static char *dlfb_set_color_depth(char *buf, u8 selection) +{ + return dlfb_set_register(buf, 0x00, selection); +} + +static char *dlfb_set_base16bpp(char *wrptr, u32 base) +{ + /* the base pointer is 16 bits wide, 0x20 is hi byte. */ + wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); + wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); + return dlfb_set_register(wrptr, 0x22, base); +} + +/* + * DisplayLink HW has separate 16bpp and 8bpp framebuffers. + * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer + */ +static char *dlfb_set_base8bpp(char *wrptr, u32 base) +{ + wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); + wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); + return dlfb_set_register(wrptr, 0x28, base); +} + +static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) +{ + wrptr = dlfb_set_register(wrptr, reg, value >> 8); + return dlfb_set_register(wrptr, reg+1, value); +} + +/* + * This is kind of weird because the controller takes some + * register values in a different byte order than other registers. + */ +static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) +{ + wrptr = dlfb_set_register(wrptr, reg, value); + return dlfb_set_register(wrptr, reg+1, value >> 8); +} + +/* + * LFSR is linear feedback shift register. The reason we have this is + * because the display controller needs to minimize the clock depth of + * various counters used in the display path. So this code reverses the + * provided value into the lfsr16 value by counting backwards to get + * the value that needs to be set in the hardware comparator to get the + * same actual count. This makes sense once you read above a couple of + * times and think about it from a hardware perspective. + */ +static u16 dlfb_lfsr16(u16 actual_count) +{ + u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ + + while (actual_count--) { + lv = ((lv << 1) | + (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) + & 0xFFFF; + } + + return (u16) lv; +} + +/* + * This does LFSR conversion on the value that is to be written. + * See LFSR explanation above for more detail. + */ +static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) +{ + return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); +} + +/* + * This takes a standard fbdev screeninfo struct and all of its monitor mode + * details and converts them into the DisplayLink equivalent register commands. + */ +static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) +{ + u16 xds, yds; + u16 xde, yde; + u16 yec; + + /* x display start */ + xds = var->left_margin + var->hsync_len; + wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); + /* x display end */ + xde = xds + var->xres; + wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); + + /* y display start */ + yds = var->upper_margin + var->vsync_len; + wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); + /* y display end */ + yde = yds + var->yres; + wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); + + /* x end count is active + blanking - 1 */ + wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, + xde + var->right_margin - 1); + + /* libdlo hardcodes hsync start to 1 */ + wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); + + /* hsync end is width of sync pulse + 1 */ + wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); + + /* hpixels is active pixels */ + wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); + + /* yendcount is vertical active + vertical blanking */ + yec = var->yres + var->upper_margin + var->lower_margin + + var->vsync_len; + wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); + + /* libdlo hardcodes vsync start to 0 */ + wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); + + /* vsync end is width of vsync pulse */ + wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); + + /* vpixels is active pixels */ + wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); + + /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ + wrptr = dlfb_set_register_16be(wrptr, 0x1B, + 200*1000*1000/var->pixclock); + + return wrptr; +} + +/* + * This takes a standard fbdev screeninfo struct that was fetched or prepared + * and then generates the appropriate command sequence that then drives the + * display controller. + */ +static int dlfb_set_video_mode(struct dlfb_data *dev, + struct fb_var_screeninfo *var) +{ + char *buf; + char *wrptr; + int retval = 0; + int writesize; + struct urb *urb; + + if (!atomic_read(&dev->usb_active)) + return -EPERM; + + urb = dlfb_get_urb(dev); + if (!urb) + return -ENOMEM; + + buf = (char *) urb->transfer_buffer; + + /* + * This first section has to do with setting the base address on the + * controller * associated with the display. There are 2 base + * pointers, currently, we only * use the 16 bpp segment. + */ + wrptr = dlfb_vidreg_lock(buf); + wrptr = dlfb_set_color_depth(wrptr, 0x00); + /* set base for 16bpp segment to 0 */ + wrptr = dlfb_set_base16bpp(wrptr, 0); + /* set base for 8bpp segment to end of fb */ + wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len); + + wrptr = dlfb_set_vid_cmds(wrptr, var); + wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK); + wrptr = dlfb_vidreg_unlock(wrptr); + + writesize = wrptr - buf; + + retval = dlfb_submit_urb(dev, urb, writesize); + + dev->blank_mode = FB_BLANK_UNBLANK; + + return retval; +} + +static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + unsigned long start = vma->vm_start; + unsigned long size = vma->vm_end - vma->vm_start; + unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; + unsigned long page, pos; + + if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) + return -EINVAL; + if (size > info->fix.smem_len) + return -EINVAL; + if (offset > info->fix.smem_len - size) + return -EINVAL; + + pos = (unsigned long)info->fix.smem_start + offset; + + pr_notice("mmap() framebuffer addr:%lu size:%lu\n", + pos, size); + + while (size > 0) { + page = vmalloc_to_pfn((void *)pos); + if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) + return -EAGAIN; + + start += PAGE_SIZE; + pos += PAGE_SIZE; + if (size > PAGE_SIZE) + size -= PAGE_SIZE; + else + size = 0; + } + + return 0; +} + +/* + * Trims identical data from front and back of line + * Sets new front buffer address and width + * And returns byte count of identical pixels + * Assumes CPU natural alignment (unsigned long) + * for back and front buffer ptrs and width + */ +static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) +{ + int j, k; + const unsigned long *back = (const unsigned long *) bback; + const unsigned long *front = (const unsigned long *) *bfront; + const int width = *width_bytes / sizeof(unsigned long); + int identical = width; + int start = width; + int end = width; + + prefetch((void *) front); + prefetch((void *) back); + + for (j = 0; j < width; j++) { + if (back[j] != front[j]) { + start = j; + break; + } + } + + for (k = width - 1; k > j; k--) { + if (back[k] != front[k]) { + end = k+1; + break; + } + } + + identical = start + (width - end); + *bfront = (u8 *) &front[start]; + *width_bytes = (end - start) * sizeof(unsigned long); + + return identical * sizeof(unsigned long); +} + +/* + * Render a command stream for an encoded horizontal line segment of pixels. + * + * A command buffer holds several commands. + * It always begins with a fresh command header + * (the protocol doesn't require this, but we enforce it to allow + * multiple buffers to be potentially encoded and sent in parallel). + * A single command encodes one contiguous horizontal line of pixels + * + * The function relies on the client to do all allocation, so that + * rendering can be done directly to output buffers (e.g. USB URBs). + * The function fills the supplied command buffer, providing information + * on where it left off, so the client may call in again with additional + * buffers if the line will take several buffers to complete. + * + * A single command can transmit a maximum of 256 pixels, + * regardless of the compression ratio (protocol design limit). + * To the hardware, 0 for a size byte means 256 + * + * Rather than 256 pixel commands which are either rl or raw encoded, + * the rlx command simply assumes alternating raw and rl spans within one cmd. + * This has a slightly larger header overhead, but produces more even results. + * It also processes all data (read and write) in a single pass. + * Performance benchmarks of common cases show it having just slightly better + * compression than 256 pixel raw or rle commands, with similar CPU consumpion. + * But for very rl friendly data, will compress not quite as well. + */ +static void dlfb_compress_hline( + const uint16_t **pixel_start_ptr, + const uint16_t *const pixel_end, + uint32_t *device_address_ptr, + uint8_t **command_buffer_ptr, + const uint8_t *const cmd_buffer_end) +{ + const uint16_t *pixel = *pixel_start_ptr; + uint32_t dev_addr = *device_address_ptr; + uint8_t *cmd = *command_buffer_ptr; + const int bpp = 2; + + while ((pixel_end > pixel) && + (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { + uint8_t *raw_pixels_count_byte = NULL; + uint8_t *cmd_pixels_count_byte = NULL; + const uint16_t *raw_pixel_start = NULL; + const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL; + + prefetchw((void *) cmd); /* pull in one cache line at least */ + + *cmd++ = 0xAF; + *cmd++ = 0x6B; + *cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF); + *cmd++ = (uint8_t) ((dev_addr >> 8) & 0xFF); + *cmd++ = (uint8_t) ((dev_addr) & 0xFF); + + cmd_pixels_count_byte = cmd++; /* we'll know this later */ + cmd_pixel_start = pixel; + + raw_pixels_count_byte = cmd++; /* we'll know this later */ + raw_pixel_start = pixel; + + cmd_pixel_end = pixel + min(MAX_CMD_PIXELS + 1, + min((int)(pixel_end - pixel), + (int)(cmd_buffer_end - cmd) / bpp)); + + prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp); + + while (pixel < cmd_pixel_end) { + const uint16_t * const repeating_pixel = pixel; + + *(uint16_t *)cmd = cpu_to_be16p(pixel); + cmd += 2; + pixel++; + + if (unlikely((pixel < cmd_pixel_end) && + (*pixel == *repeating_pixel))) { + /* go back and fill in raw pixel count */ + *raw_pixels_count_byte = ((repeating_pixel - + raw_pixel_start) + 1) & 0xFF; + + while ((pixel < cmd_pixel_end) + && (*pixel == *repeating_pixel)) { + pixel++; + } + + /* immediately after raw data is repeat byte */ + *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; + + /* Then start another raw pixel span */ + raw_pixel_start = pixel; + raw_pixels_count_byte = cmd++; + } + } + + if (pixel > raw_pixel_start) { + /* finalize last RAW span */ + *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; + } + + *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; + dev_addr += (pixel - cmd_pixel_start) * bpp; + } + + if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) { + /* Fill leftover bytes with no-ops */ + if (cmd_buffer_end > cmd) + memset(cmd, 0xAF, cmd_buffer_end - cmd); + cmd = (uint8_t *) cmd_buffer_end; + } + + *command_buffer_ptr = cmd; + *pixel_start_ptr = pixel; + *device_address_ptr = dev_addr; + + return; +} + +/* + * There are 3 copies of every pixel: The front buffer that the fbdev + * client renders to, the actual framebuffer across the USB bus in hardware + * (that we can only write to, slowly, and can never read), and (optionally) + * our shadow copy that tracks what's been sent to that hardware buffer. + */ +static int dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr, + const char *front, char **urb_buf_ptr, + u32 byte_offset, u32 byte_width, + int *ident_ptr, int *sent_ptr) +{ + const u8 *line_start, *line_end, *next_pixel; + u32 dev_addr = dev->base16 + byte_offset; + struct urb *urb = *urb_ptr; + u8 *cmd = *urb_buf_ptr; + u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; + + line_start = (u8 *) (front + byte_offset); + next_pixel = line_start; + line_end = next_pixel + byte_width; + + if (dev->backing_buffer) { + int offset; + const u8 *back_start = (u8 *) (dev->backing_buffer + + byte_offset); + + *ident_ptr += dlfb_trim_hline(back_start, &next_pixel, + &byte_width); + + offset = next_pixel - line_start; + line_end = next_pixel + byte_width; + dev_addr += offset; + back_start += offset; + line_start += offset; + + memcpy((char *)back_start, (char *) line_start, + byte_width); + } + + while (next_pixel < line_end) { + + dlfb_compress_hline((const uint16_t **) &next_pixel, + (const uint16_t *) line_end, &dev_addr, + (u8 **) &cmd, (u8 *) cmd_end); + + if (cmd >= cmd_end) { + int len = cmd - (u8 *) urb->transfer_buffer; + if (dlfb_submit_urb(dev, urb, len)) + return 1; /* lost pixels is set */ + *sent_ptr += len; + urb = dlfb_get_urb(dev); + if (!urb) + return 1; /* lost_pixels is set */ + *urb_ptr = urb; + cmd = urb->transfer_buffer; + cmd_end = &cmd[urb->transfer_buffer_length]; + } + } + + *urb_buf_ptr = cmd; + + return 0; +} + +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"); + |