| /* |
| * udlfb.c -- Framebuffer driver for DisplayLink USB controller |
| * |
| * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it> |
| * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com> |
| * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com> |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License v2. See the file COPYING in the main directory of this archive for |
| * more details. |
| * |
| * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven, |
| * usb-skeleton by GregKH. |
| * |
| * Device-specific portions based on information from Displaylink, with work |
| * from Florian Echtler, Henrik Bjerregaard Pedersen, and others. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/usb.h> |
| #include <linux/uaccess.h> |
| #include <linux/mm.h> |
| #include <linux/fb.h> |
| #include <linux/vmalloc.h> |
| #include <linux/slab.h> |
| |
| #include "udlfb.h" |
| |
| static struct fb_fix_screeninfo dlfb_fix = { |
| .id = "udlfb", |
| .type = FB_TYPE_PACKED_PIXELS, |
| .visual = FB_VISUAL_TRUECOLOR, |
| .xpanstep = 0, |
| .ypanstep = 0, |
| .ywrapstep = 0, |
| .accel = FB_ACCEL_NONE, |
| }; |
| |
| static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | |
| #ifdef FBINFO_VIRTFB |
| FBINFO_VIRTFB | |
| #endif |
| FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | |
| FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; |
| |
| /* |
| * There are many DisplayLink-based products, all with unique PIDs. We are able |
| * to support all volume ones (circa 2009) with a single driver, so we match |
| * globally on VID. TODO: Probe() needs to detect when we might be running |
| * "future" chips, and bail on those, so a compatible driver can match. |
| */ |
| static struct usb_device_id id_table[] = { |
| {.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,}, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(usb, id_table); |
| |
| #ifndef CONFIG_FB_DEFERRED_IO |
| #warning Please set CONFIG_FB_DEFFERRED_IO option to support generic fbdev apps |
| #endif |
| |
| #ifndef CONFIG_FB_SYS_IMAGEBLIT |
| #ifndef CONFIG_FB_SYS_IMAGEBLIT_MODULE |
| #warning Please set CONFIG_FB_SYS_IMAGEBLIT option to support fb console |
| #endif |
| #endif |
| |
| #ifndef CONFIG_FB_MODE_HELPERS |
| #warning CONFIG_FB_MODE_HELPERS required. Expect build break |
| #endif |
| |
| /* 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); |
| |
| /* other symbols with dependents */ |
| #ifdef CONFIG_FB_DEFERRED_IO |
| static struct fb_deferred_io dlfb_defio; |
| #endif |
| |
| /* |
| * All DisplayLink bulk operations start with 0xAF, followed by specific code |
| * All operations are written to buffers which then later get sent to device |
| */ |
| static char *dlfb_set_register(char *buf, u8 reg, u8 val) |
| { |
| *buf++ = 0xAF; |
| *buf++ = 0x20; |
| *buf++ = reg; |
| *buf++ = val; |
| return buf; |
| } |
| |
| static char *dlfb_vidreg_lock(char *buf) |
| { |
| return dlfb_set_register(buf, 0xFF, 0x00); |
| } |
| |
| static char *dlfb_vidreg_unlock(char *buf) |
| { |
| return dlfb_set_register(buf, 0xFF, 0xFF); |
| } |
| |
| /* |
| * On/Off for driving the DisplayLink framebuffer to the display |
| */ |
| static char *dlfb_enable_hvsync(char *buf, bool enable) |
| { |
| if (enable) |
| return dlfb_set_register(buf, 0x1F, 0x00); |
| else |
| return dlfb_set_register(buf, 0x1F, 0x01); |
| } |
| |
| static char *dlfb_set_color_depth(char *buf, u8 selection) |
| { |
| return dlfb_set_register(buf, 0x00, selection); |
| } |
| |
| static char *dlfb_set_base16bpp(char *wrptr, u32 base) |
| { |
| /* the base pointer is 16 bits wide, 0x20 is hi byte. */ |
| wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); |
| wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); |
| return dlfb_set_register(wrptr, 0x22, base); |
| } |
| |
| /* |
| * DisplayLink HW has separate 16bpp and 8bpp framebuffers. |
| * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer |
| */ |
| static char *dlfb_set_base8bpp(char *wrptr, u32 base) |
| { |
| wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); |
| wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); |
| return dlfb_set_register(wrptr, 0x28, base); |
| } |
| |
| static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) |
| { |
| wrptr = dlfb_set_register(wrptr, reg, value >> 8); |
| return dlfb_set_register(wrptr, reg+1, value); |
| } |
| |
| /* |
| * This is kind of weird because the controller takes some |
| * register values in a different byte order than other registers. |
| */ |
| static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) |
| { |
| wrptr = dlfb_set_register(wrptr, reg, value); |
| return dlfb_set_register(wrptr, reg+1, value >> 8); |
| } |
| |
| /* |
| * LFSR is linear feedback shift register. The reason we have this is |
| * because the display controller needs to minimize the clock depth of |
| * various counters used in the display path. So this code reverses the |
| * provided value into the lfsr16 value by counting backwards to get |
| * the value that needs to be set in the hardware comparator to get the |
| * same actual count. This makes sense once you read above a couple of |
| * times and think about it from a hardware perspective. |
| */ |
| static u16 dlfb_lfsr16(u16 actual_count) |
| { |
| u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ |
| |
| while (actual_count--) { |
| lv = ((lv << 1) | |
| (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) |
| & 0xFFFF; |
| } |
| |
| return (u16) lv; |
| } |
| |
| /* |
| * This does LFSR conversion on the value that is to be written. |
| * See LFSR explanation above for more detail. |
| */ |
| static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) |
| { |
| return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); |
| } |
| |
| /* |
| * This takes a standard fbdev screeninfo struct and all of its monitor mode |
| * details and converts them into the DisplayLink equivalent register commands. |
| */ |
| static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) |
| { |
| u16 xds, yds; |
| u16 xde, yde; |
| u16 yec; |
| |
| /* x display start */ |
| xds = var->left_margin + var->hsync_len; |
| wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); |
| /* x display end */ |
| xde = xds + var->xres; |
| wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); |
| |
| /* y display start */ |
| yds = var->upper_margin + var->vsync_len; |
| wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); |
| /* y display end */ |
| yde = yds + var->yres; |
| wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); |
| |
| /* x end count is active + blanking - 1 */ |
| wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, |
| xde + var->right_margin - 1); |
| |
| /* libdlo hardcodes hsync start to 1 */ |
| wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); |
| |
| /* hsync end is width of sync pulse + 1 */ |
| wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); |
| |
| /* hpixels is active pixels */ |
| wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); |
| |
| /* yendcount is vertical active + vertical blanking */ |
| yec = var->yres + var->upper_margin + var->lower_margin + |
| var->vsync_len; |
| wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); |
| |
| /* libdlo hardcodes vsync start to 0 */ |
| wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); |
| |
| /* vsync end is width of vsync pulse */ |
| wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); |
| |
| /* vpixels is active pixels */ |
| wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); |
| |
| /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ |
| wrptr = dlfb_set_register_16be(wrptr, 0x1B, |
| 200*1000*1000/var->pixclock); |
| |
| return wrptr; |
| } |
| |
| /* |
| * This takes a standard fbdev screeninfo struct that was fetched or prepared |
| * and then generates the appropriate command sequence that then drives the |
| * display controller. |
| */ |
| static int dlfb_set_video_mode(struct dlfb_data *dev, |
| struct fb_var_screeninfo *var) |
| { |
| char *buf; |
| char *wrptr; |
| int retval = 0; |
| int writesize; |
| struct urb *urb; |
| |
| if (!atomic_read(&dev->usb_active)) |
| return -EPERM; |
| |
| urb = dlfb_get_urb(dev); |
| if (!urb) |
| return -ENOMEM; |
| buf = (char *) urb->transfer_buffer; |
| |
| /* |
| * This first section has to do with setting the base address on the |
| * controller * associated with the display. There are 2 base |
| * pointers, currently, we only * use the 16 bpp segment. |
| */ |
| wrptr = dlfb_vidreg_lock(buf); |
| wrptr = dlfb_set_color_depth(wrptr, 0x00); |
| /* set base for 16bpp segment to 0 */ |
| wrptr = dlfb_set_base16bpp(wrptr, 0); |
| /* set base for 8bpp segment to end of fb */ |
| wrptr = dlfb_set_base8bpp(wrptr, dev->info->fix.smem_len); |
| |
| wrptr = dlfb_set_vid_cmds(wrptr, var); |
| wrptr = dlfb_enable_hvsync(wrptr, true); |
| wrptr = dlfb_vidreg_unlock(wrptr); |
| |
| writesize = wrptr - buf; |
| |
| retval = dlfb_submit_urb(dev, urb, writesize); |
| |
| return retval; |
| } |
| |
| static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) |
| { |
| unsigned long start = vma->vm_start; |
| unsigned long size = vma->vm_end - vma->vm_start; |
| unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; |
| unsigned long page, pos; |
| struct dlfb_data *dev = info->par; |
| |
| dl_notice("MMAP: %lu %u\n", offset + size, info->fix.smem_len); |
| |
| if (offset + size > info->fix.smem_len) |
| return -EINVAL; |
| |
| pos = (unsigned long)info->fix.smem_start + offset; |
| |
| while (size > 0) { |
| page = vmalloc_to_pfn((void *)pos); |
| if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) |
| return -EAGAIN; |
| |
| start += PAGE_SIZE; |
| pos += PAGE_SIZE; |
| if (size > PAGE_SIZE) |
| size -= PAGE_SIZE; |
| else |
| size = 0; |
| } |
| |
| vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */ |
| return 0; |
| |
| } |
| |
| /* |
| * Trims identical data from front and back of line |
| * Sets new front buffer address and width |
| * And returns byte count of identical pixels |
| * Assumes CPU natural alignment (unsigned long) |
| * for back and front buffer ptrs and width |
| */ |
| static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) |
| { |
| int j, k; |
| const unsigned long *back = (const unsigned long *) bback; |
| const unsigned long *front = (const unsigned long *) *bfront; |
| const int width = *width_bytes / sizeof(unsigned long); |
| int identical = width; |
| int start = width; |
| int end = width; |
| |
| prefetch((void *) front); |
| prefetch((void *) back); |
| |
| for (j = 0; j < width; j++) { |
| if (back[j] != front[j]) { |
| start = j; |
| break; |
| } |
| } |
| |
| for (k = width - 1; k > j; k--) { |
| if (back[k] != front[k]) { |
| end = k+1; |
| break; |
| } |
| } |
| |
| identical = start + (width - end); |
| *bfront = (u8 *) &front[start]; |
| *width_bytes = (end - start) * sizeof(unsigned long); |
| |
| return identical * sizeof(unsigned long); |
| } |
| |
| /* |
| * Render a command stream for an encoded horizontal line segment of pixels. |
| * |
| * A command buffer holds several commands. |
| * It always begins with a fresh command header |
| * (the protocol doesn't require this, but we enforce it to allow |
| * multiple buffers to be potentially encoded and sent in parallel). |
| * A single command encodes one contiguous horizontal line of pixels |
| * |
| * The function relies on the client to do all allocation, so that |
| * rendering can be done directly to output buffers (e.g. USB URBs). |
| * The function fills the supplied command buffer, providing information |
| * on where it left off, so the client may call in again with additional |
| * buffers if the line will take several buffers to complete. |
| * |
| * A single command can transmit a maximum of 256 pixels, |
| * regardless of the compression ratio (protocol design limit). |
| * To the hardware, 0 for a size byte means 256 |
| * |
| * Rather than 256 pixel commands which are either rl or raw encoded, |
| * the rlx command simply assumes alternating raw and rl spans within one cmd. |
| * This has a slightly larger header overhead, but produces more even results. |
| * It also processes all data (read and write) in a single pass. |
| * Performance benchmarks of common cases show it having just slightly better |
| * compression than 256 pixel raw -or- rle commands, with similar CPU consumpion. |
| * But for very rl friendly data, will compress not quite as well. |
| */ |
| static void dlfb_compress_hline( |
| const uint16_t **pixel_start_ptr, |
| const uint16_t *const pixel_end, |
| uint32_t *device_address_ptr, |
| uint8_t **command_buffer_ptr, |
| const uint8_t *const cmd_buffer_end) |
| { |
| const uint16_t *pixel = *pixel_start_ptr; |
| uint32_t dev_addr = *device_address_ptr; |
| uint8_t *cmd = *command_buffer_ptr; |
| const int bpp = 2; |
| |
| while ((pixel_end > pixel) && |
| (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { |
| uint8_t *raw_pixels_count_byte = 0; |
| uint8_t *cmd_pixels_count_byte = 0; |
| const uint16_t *raw_pixel_start = 0; |
| const uint16_t *cmd_pixel_start, *cmd_pixel_end = 0; |
| const uint32_t be_dev_addr = cpu_to_be32(dev_addr); |
| |
| prefetchw((void *) cmd); /* pull in one cache line at least */ |
| |
| *cmd++ = 0xAF; |
| *cmd++ = 0x6B; |
| *cmd++ = (uint8_t) ((be_dev_addr >> 8) & 0xFF); |
| *cmd++ = (uint8_t) ((be_dev_addr >> 16) & 0xFF); |
| *cmd++ = (uint8_t) ((be_dev_addr >> 24) & 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 void 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; /* lost pixels is set */ |
| *sent_ptr += len; |
| urb = dlfb_get_urb(dev); |
| if (!urb) |
| return; /* lost_pixels is set */ |
| *urb_ptr = urb; |
| cmd = urb->transfer_buffer; |
| cmd_end = &cmd[urb->transfer_buffer_length]; |
| } |
| } |
| |
| *urb_buf_ptr = cmd; |
| } |
| |
| 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); |
| |
| dlfb_render_hline(dev, &urb, (char *) dev->info->fix.smem_start, |
| &cmd, byte_offset, width * BPP, |
| &bytes_identical, &bytes_sent); |
| } |
| |
| 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); |
| |
| 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; |
| } |
| |
| /* hardware has native COPY command (see libdlo), but not worth it for fbcon */ |
| static void dlfb_ops_copyarea(struct fb_info *info, |
| const struct fb_copyarea *area) |
| { |
| |
| struct dlfb_data *dev = info->par; |
| |
| #if defined CONFIG_FB_SYS_COPYAREA || defined CONFIG_FB_SYS_COPYAREA_MODULE |
| |
| sys_copyarea(info, area); |
| |
| dlfb_handle_damage(dev, area->dx, area->dy, |
| area->width, area->height, info->screen_base); |
| #endif |
| atomic_inc(&dev->copy_count); |
| |
| } |
| |
| static void dlfb_ops_imageblit(struct fb_info *info, |
| const struct fb_image *image) |
| { |
| struct dlfb_data *dev = info->par; |
| |
| #if defined CONFIG_FB_SYS_IMAGEBLIT || defined CONFIG_FB_SYS_IMAGEBLIT_MODULE |
| |
| sys_imageblit(info, image); |
| |
| dlfb_handle_damage(dev, image->dx, image->dy, |
| image->width, image->height, info->screen_base); |
| |
| #endif |
| |
| atomic_inc(&dev->blit_count); |
| } |
| |
| static void dlfb_ops_fillrect(struct fb_info *info, |
| const struct fb_fillrect *rect) |
| { |
| struct dlfb_data *dev = info->par; |
| |
| #if defined CONFIG_FB_SYS_FILLRECT || defined CONFIG_FB_SYS_FILLRECT_MODULE |
| |
| sys_fillrect(info, rect); |
| |
| dlfb_handle_damage(dev, rect->dx, rect->dy, rect->width, |
| rect->height, info->screen_base); |
| #endif |
| |
| atomic_inc(&dev->fill_count); |
| |
| } |
| |
| 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->par; |
| struct dloarea *area = NULL; |
| |
| if (!atomic_read(&dev->usb_active)) |
| return 0; |
| |
| /* TODO: Update X server to get this from sysfs instead */ |
| if (cmd == DLFB_IOCTL_RETURN_EDID) { |
| char *edid = (char *)arg; |
| dlfb_get_edid(dev); |
| if (copy_to_user(edid, dev->edid, sizeof(dev->edid))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ |
| if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { |
| |
| area = (struct dloarea *)arg; |
| |
| if (area->x < 0) |
| area->x = 0; |
| |
| if (area->x > info->var.xres) |
| area->x = info->var.xres; |
| |
| if (area->y < 0) |
| area->y = 0; |
| |
| if (area->y > info->var.yres) |
| area->y = info->var.yres; |
| |
| atomic_set(&dev->use_defio, 0); |
| |
| dlfb_handle_damage(dev, area->x, area->y, area->w, area->h, |
| info->screen_base); |
| atomic_inc(&dev->damage_count); |
| } |
| |
| 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. |
| */ |
| static int dlfb_ops_open(struct fb_info *info, int user) |
| { |
| struct dlfb_data *dev = info->par; |
| |
| /* if (user == 0) |
| * We could special case kernel mode clients (fbcon) here |
| */ |
| |
| mutex_lock(&dev->fb_open_lock); |
| |
| dev->fb_count++; |
| |
| #ifdef CONFIG_FB_DEFERRED_IO |
| if ((atomic_read(&dev->use_defio)) && (info->fbdefio == NULL)) { |
| /* enable defio */ |
| info->fbdefio = &dlfb_defio; |
| fb_deferred_io_init(info); |
| } |
| #endif |
| |
| dl_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n", |
| info->node, user, info, dev->fb_count); |
| |
| mutex_unlock(&dev->fb_open_lock); |
| |
| return 0; |
| } |
| |
| static int dlfb_ops_release(struct fb_info *info, int user) |
| { |
| struct dlfb_data *dev = info->par; |
| |
| mutex_lock(&dev->fb_open_lock); |
| |
| dev->fb_count--; |
| |
| #ifdef CONFIG_FB_DEFERRED_IO |
| if ((dev->fb_count == 0) && (info->fbdefio)) { |
| fb_deferred_io_cleanup(info); |
| info->fbdefio = NULL; |
| info->fbops->fb_mmap = dlfb_ops_mmap; |
| } |
| #endif |
| |
| dl_notice("release /dev/fb%d user=%d count=%d\n", |
| info->node, user, dev->fb_count); |
| |
| mutex_unlock(&dev->fb_open_lock); |
| |
| 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_delete(struct kref *kref) |
| { |
| struct dlfb_data *dev = container_of(kref, struct dlfb_data, kref); |
| |
| if (dev->backing_buffer) |
| vfree(dev->backing_buffer); |
| |
| mutex_destroy(&dev->fb_open_lock); |
| |
| kfree(dev); |
| } |
| |
| /* |
| * Called by fbdev as last part of unregister_framebuffer() process |
| * No new clients can open connections. Deallocate everything fb_info. |
| */ |
| static void dlfb_ops_destroy(struct fb_info *info) |
| { |
| struct dlfb_data *dev = info->par; |
| |
| if (info->cmap.len != 0) |
| fb_dealloc_cmap(&info->cmap); |
| if (info->monspecs.modedb) |
| fb_destroy_modedb(info->monspecs.modedb); |
| if (info->screen_base) |
| vfree(info->screen_base); |
| |
| fb_destroy_modelist(&info->modelist); |
| |
| framebuffer_release(info); |
| |
| /* ref taken before register_framebuffer() for dlfb_data clients */ |
| kref_put(&dev->kref, dlfb_delete); |
| } |
| |
| /* |
| * 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_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; |
| |
| dl_notice("set_par mode %dx%d\n", info->var.xres, info->var.yres); |
| |
| return dlfb_set_video_mode(dev, &info->var); |
| } |
| |
| static int dlfb_ops_blank(int blank_mode, struct fb_info *info) |
| { |
| struct dlfb_data *dev = info->par; |
| char *bufptr; |
| struct urb *urb; |
| |
| urb = dlfb_get_urb(dev); |
| if (!urb) |
| return 0; |
| bufptr = (char *) urb->transfer_buffer; |
| |
| /* overloading usb_active. UNBLANK can conflict with teardown */ |
| |
| bufptr = dlfb_vidreg_lock(bufptr); |
| if (blank_mode != FB_BLANK_UNBLANK) { |
| atomic_set(&dev->usb_active, 0); |
| bufptr = dlfb_enable_hvsync(bufptr, false); |
| } else { |
| atomic_set(&dev->usb_active, 1); |
| bufptr = dlfb_enable_hvsync(bufptr, true); |
| } |
| bufptr = dlfb_vidreg_unlock(bufptr); |
| |
| dlfb_submit_urb(dev, urb, bufptr - (char *) urb->transfer_buffer); |
| |
| return 0; |
| } |
| |
| static struct fb_ops dlfb_ops = { |
| .owner = THIS_MODULE, |
| .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, |
| }; |
| |
| /* |
| * 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) |
| { |
| int i; |
| const struct fb_videomode *default_vmode = NULL; |
| int result = 0; |
| |
| fb_destroy_modelist(&info->modelist); |
| memset(&info->monspecs, 0, sizeof(info->monspecs)); |
| |
| dlfb_get_edid(dev); |
| fb_edid_to_monspecs(dev->edid, &info->monspecs); |
| |
| 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); |
| } |
| |
| 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); |
| } |
| |
| /* |
| * 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); |
| } |
| |
| fb_videomode_to_var(var, default_vmode); |
| dlfb_var_color_format(var); |
| |
| 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 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"); |
| } |
| |
| 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; |
| char *edid = &dev->edid[0]; |
| const size_t size = sizeof(dev->edid); |
| |
| if (dlfb_parse_edid(dev, &fb_info->var, fb_info)) |
| return 0; |
| |
| if (off >= size) |
| return 0; |
| |
| if (off + count > size) |
| count = size - off; |
| memcpy(buf, edid + off, count); |
| |
| return count; |
| } |
| |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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_IWUSR, NULL, metrics_reset_store), |
| __ATTR_RW(use_defio), |
| }; |
| |
| #ifdef CONFIG_FB_DEFERRED_IO |
| 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; |
| int fault_count = 0; |
| |
| if (!atomic_read(&dev->use_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) { |
| dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start, |
| &cmd, cur->index << PAGE_SHIFT, |
| PAGE_SIZE, &bytes_identical, &bytes_sent); |
| bytes_rendered += PAGE_SIZE; |
| fault_count++; |
| } |
| |
| 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); |
| |
| atomic_add(fault_count, &dev->defio_fault_count); |
| 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 struct fb_deferred_io dlfb_defio = { |
| .delay = 5, |
| .deferred_io = dlfb_dpy_deferred_io, |
| }; |
| |
| #endif |
| |
| /* |
| * 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_usb_probe(struct usb_interface *interface, |
| const struct usb_device_id *id) |
| { |
| struct usb_device *usbdev; |
| struct dlfb_data *dev; |
| struct fb_info *info; |
| int videomemorysize; |
| int i; |
| unsigned char *videomemory; |
| int retval = -ENOMEM; |
| struct fb_var_screeninfo *var; |
| int registered = 0; |
| u16 *pix_framebuffer; |
| |
| /* usb initialization */ |
| |
| usbdev = interface_to_usbdev(interface); |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (dev == NULL) { |
| err("dlfb_usb_probe: failed alloc of dev struct\n"); |
| goto error; |
| } |
| |
| /* we need to wait for both usb and fbdev to spin down on disconnect */ |
| kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */ |
| kref_get(&dev->kref); /* matching kref_put in .fb_destroy function*/ |
| |
| dev->udev = usbdev; |
| dev->gdev = &usbdev->dev; /* our generic struct device * */ |
| usb_set_intfdata(interface, dev); |
| |
| if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { |
| retval = -ENOMEM; |
| dl_err("dlfb_alloc_urb_list failed\n"); |
| goto error; |
| } |
| |
| mutex_init(&dev->fb_open_lock); |
| |
| /* We don't register a new USB class. Our client interface is fbdev */ |
| |
| /* allocates framebuffer driver structure, not framebuffer memory */ |
| info = framebuffer_alloc(0, &usbdev->dev); |
| if (!info) { |
| retval = -ENOMEM; |
| dl_err("framebuffer_alloc failed\n"); |
| goto error; |
| } |
| dev->info = info; |
| info->par = dev; |
| info->pseudo_palette = dev->pseudo_palette; |
| info->fbops = &dlfb_ops; |
| |
| var = &info->var; |
| |
| /* TODO set limit based on actual SKU detection */ |
| dev->sku_pixel_limit = 2048 * 1152; |
| |
| INIT_LIST_HEAD(&info->modelist); |
| dlfb_parse_edid(dev, var, info); |
| |
| /* |
| * ok, now that we've got the size info, we can alloc our framebuffer. |
| */ |
| 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. |
| * TODO: Handle fbcon cursor code calling blit in interrupt context |
| */ |
| videomemory = vmalloc(videomemorysize); |
| if (!videomemory) { |
| retval = -ENOMEM; |
| dl_err("Virtual framebuffer alloc failed\n"); |
| goto error; |
| } |
| |
| info->screen_base = videomemory; |
| info->fix.smem_len = PAGE_ALIGN(videomemorysize); |
| info->fix.smem_start = (unsigned long) videomemory; |
| info->flags = udlfb_info_flags; |
| |
| |
| /* |
| * 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(videomemorysize); |
| if (!dev->backing_buffer) |
| dl_warn("No shadow/backing buffer allcoated\n"); |
| else |
| memset(dev->backing_buffer, 0, videomemorysize); |
| |
| retval = fb_alloc_cmap(&info->cmap, 256, 0); |
| if (retval < 0) { |
| dl_err("fb_alloc_cmap failed %x\n", retval); |
| goto error; |
| } |
| |
| /* ready to begin using device */ |
| |
| #ifdef CONFIG_FB_DEFERRED_IO |
| atomic_set(&dev->use_defio, 1); |
| #endif |
| atomic_set(&dev->usb_active, 1); |
| dlfb_select_std_channel(dev); |
| |
| dlfb_ops_check_var(var, info); |
| dlfb_ops_set_par(info); |
| |
| /* paint greenscreen */ |
| pix_framebuffer = (u16 *) videomemory; |
| for (i = 0; i < videomemorysize / 2; i++) |
| pix_framebuffer[i] = 0x37e6; |
| |
| dlfb_handle_damage(dev, 0, 0, info->var.xres, info->var.yres, |
| videomemory); |
| |
| retval = register_framebuffer(info); |
| if (retval < 0) { |
| dl_err("register_framebuffer failed %d\n", retval); |
| goto error; |
| } |
| registered = 1; |
| |
| for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) |
| device_create_file(info->dev, &fb_device_attrs[i]); |
| |
| device_create_bin_file(info->dev, &edid_attr); |
| |
| dl_err("DisplayLink USB device /dev/fb%d attached. %dx%d resolution." |
| " Using %dK framebuffer memory\n", info->node, |
| var->xres, var->yres, |
| ((dev->backing_buffer) ? |
| videomemorysize * 2 : videomemorysize) >> 10); |
| return 0; |
| |
| error: |
| if (dev) { |
| if (registered) { |
| unregister_framebuffer(info); |
| dlfb_ops_destroy(info); |
| } else |
| kref_put(&dev->kref, dlfb_delete); |
| |
| if (dev->urbs.count > 0) |
| dlfb_free_urb_list(dev); |
| kref_put(&dev->kref, dlfb_delete); /* last ref from kref_init */ |
| |
| /* dev has been deallocated. Do not dereference */ |
| } |
| |
| return retval; |
| } |
| |
| 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; |
| |
| /* when non-active we'll update virtual framebuffer, but no new urbs */ |
| atomic_set(&dev->usb_active, 0); |
| |
| usb_set_intfdata(interface, NULL); |
| |
| 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); |
| |
| /* this function will wait for all in-flight urbs to complete */ |
| dlfb_free_urb_list(dev); |
| |
| if (info) { |
| dl_notice("Detaching /dev/fb%d\n", info->node); |
| unregister_framebuffer(info); |
| dlfb_ops_destroy(info); |
| } |
| |
| /* release reference taken by kref_init in probe() */ |
| kref_put(&dev->kref, dlfb_delete); |
| |
| /* 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, |
| }; |
| |
| static int __init dlfb_module_init(void) |
| { |
| int res; |
| |
| res = usb_register(&dlfb_driver); |
| if (res) |
| err("usb_register failed. Error number %d", res); |
| |
| printk(KERN_INFO "VMODES initialized\n"); |
| |
| return res; |
| } |
| |
| static void __exit dlfb_module_exit(void) |
| { |
| usb_deregister(&dlfb_driver); |
| } |
| |
| module_init(dlfb_module_init); |
| module_exit(dlfb_module_exit); |
| |
| 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_free_coherent(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_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; |
| |
| 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>, " |
| "Bernie Thompson <bernie@plugable.com>"); |
| MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); |
| MODULE_LICENSE("GPL"); |
| |