diff options
Diffstat (limited to 'drivers/staging/udlfb/udlfb.c')
| -rw-r--r-- | drivers/staging/udlfb/udlfb.c | 1629 |
1 files changed, 0 insertions, 1629 deletions
diff --git a/drivers/staging/udlfb/udlfb.c b/drivers/staging/udlfb/udlfb.c deleted file mode 100644 index c7e061e5e04..00000000000 --- a/drivers/staging/udlfb/udlfb.c +++ /dev/null @@ -1,1629 +0,0 @@ -/* - * 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_IWUGO, 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"); - |