diff options
Diffstat (limited to 'drivers/video/fbdev/udlfb.c')
| -rw-r--r-- | drivers/video/fbdev/udlfb.c | 2009 |
1 files changed, 2009 insertions, 0 deletions
diff --git a/drivers/video/fbdev/udlfb.c b/drivers/video/fbdev/udlfb.c new file mode 100644 index 000000000..256d9b61f --- /dev/null +++ b/drivers/video/fbdev/udlfb.c @@ -0,0 +1,2009 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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> + * + * 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 <linux/delay.h> +#include <asm/unaligned.h> +#include <video/udlfb.h> +#include "edid.h" + +#define OUT_EP_NUM 1 /* The endpoint number we will use */ + +static const struct fb_fix_screeninfo dlfb_fix = { + .id = "udlfb", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_TRUECOLOR, + .xpanstep = 0, + .ypanstep = 0, + .ywrapstep = 0, + .accel = FB_ACCEL_NONE, +}; + +static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | + FBINFO_VIRTFB | + FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | + FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; + +/* + * There are many DisplayLink-based graphics products, all with unique PIDs. + * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) + * We also require a match on SubClass (0x00) and Protocol (0x00), + * which is compatible with all known USB 2.0 era graphics chips and firmware, + * but allows DisplayLink to increment those for any future incompatible chips + */ +static const struct usb_device_id id_table[] = { + {.idVendor = 0x17e9, + .bInterfaceClass = 0xff, + .bInterfaceSubClass = 0x00, + .bInterfaceProtocol = 0x00, + .match_flags = USB_DEVICE_ID_MATCH_VENDOR | + USB_DEVICE_ID_MATCH_INT_CLASS | + USB_DEVICE_ID_MATCH_INT_SUBCLASS | + USB_DEVICE_ID_MATCH_INT_PROTOCOL, + }, + {}, +}; +MODULE_DEVICE_TABLE(usb, id_table); + +/* module options */ +static bool console = true; /* Allow fbcon to open framebuffer */ +static bool fb_defio = true; /* Detect mmap writes using page faults */ +static bool shadow = true; /* Optionally disable shadow framebuffer */ +static int pixel_limit; /* Optionally force a pixel resolution limit */ + +struct dlfb_deferred_free { + struct list_head list; + void *mem; +}; + +static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len); + +/* 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 *dlfb); +static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb * urb, size_t len); +static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size); +static void dlfb_free_urb_list(struct dlfb_data *dlfb); + +/* + * All DisplayLink bulk operations start with 0xAF, followed by specific code + * All operations are written to buffers which then later get sent to device + */ +static char *dlfb_set_register(char *buf, u8 reg, u8 val) +{ + *buf++ = 0xAF; + *buf++ = 0x20; + *buf++ = reg; + *buf++ = val; + return buf; +} + +static char *dlfb_vidreg_lock(char *buf) +{ + return dlfb_set_register(buf, 0xFF, 0x00); +} + +static char *dlfb_vidreg_unlock(char *buf) +{ + return dlfb_set_register(buf, 0xFF, 0xFF); +} + +/* + * Map FB_BLANK_* to DisplayLink register + * DLReg FB_BLANK_* + * ----- ----------------------------- + * 0x00 FB_BLANK_UNBLANK (0) + * 0x01 FB_BLANK (1) + * 0x03 FB_BLANK_VSYNC_SUSPEND (2) + * 0x05 FB_BLANK_HSYNC_SUSPEND (3) + * 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back + */ +static char *dlfb_blanking(char *buf, int fb_blank) +{ + u8 reg; + + switch (fb_blank) { + case FB_BLANK_POWERDOWN: + reg = 0x07; + break; + case FB_BLANK_HSYNC_SUSPEND: + reg = 0x05; + break; + case FB_BLANK_VSYNC_SUSPEND: + reg = 0x03; + break; + case FB_BLANK_NORMAL: + reg = 0x01; + break; + default: + reg = 0x00; + } + + buf = dlfb_set_register(buf, 0x1F, reg); + + return buf; +} + +static char *dlfb_set_color_depth(char *buf, u8 selection) +{ + return dlfb_set_register(buf, 0x00, selection); +} + +static char *dlfb_set_base16bpp(char *wrptr, u32 base) +{ + /* the base pointer is 16 bits wide, 0x20 is hi byte. */ + wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); + wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); + return dlfb_set_register(wrptr, 0x22, base); +} + +/* + * DisplayLink HW has separate 16bpp and 8bpp framebuffers. + * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer + */ +static char *dlfb_set_base8bpp(char *wrptr, u32 base) +{ + wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); + wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); + return dlfb_set_register(wrptr, 0x28, base); +} + +static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) +{ + wrptr = dlfb_set_register(wrptr, reg, value >> 8); + return dlfb_set_register(wrptr, reg+1, value); +} + +/* + * This is kind of weird because the controller takes some + * register values in a different byte order than other registers. + */ +static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) +{ + wrptr = dlfb_set_register(wrptr, reg, value); + return dlfb_set_register(wrptr, reg+1, value >> 8); +} + +/* + * LFSR is linear feedback shift register. The reason we have this is + * because the display controller needs to minimize the clock depth of + * various counters used in the display path. So this code reverses the + * provided value into the lfsr16 value by counting backwards to get + * the value that needs to be set in the hardware comparator to get the + * same actual count. This makes sense once you read above a couple of + * times and think about it from a hardware perspective. + */ +static u16 dlfb_lfsr16(u16 actual_count) +{ + u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ + + while (actual_count--) { + lv = ((lv << 1) | + (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) + & 0xFFFF; + } + + return (u16) lv; +} + +/* + * This does LFSR conversion on the value that is to be written. + * See LFSR explanation above for more detail. + */ +static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) +{ + return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); +} + +/* + * This takes a standard fbdev screeninfo struct and all of its monitor mode + * details and converts them into the DisplayLink equivalent register commands. + */ +static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) +{ + u16 xds, yds; + u16 xde, yde; + u16 yec; + + /* x display start */ + xds = var->left_margin + var->hsync_len; + wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); + /* x display end */ + xde = xds + var->xres; + wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); + + /* y display start */ + yds = var->upper_margin + var->vsync_len; + wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); + /* y display end */ + yde = yds + var->yres; + wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); + + /* x end count is active + blanking - 1 */ + wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, + xde + var->right_margin - 1); + + /* libdlo hardcodes hsync start to 1 */ + wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); + + /* hsync end is width of sync pulse + 1 */ + wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); + + /* hpixels is active pixels */ + wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); + + /* yendcount is vertical active + vertical blanking */ + yec = var->yres + var->upper_margin + var->lower_margin + + var->vsync_len; + wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); + + /* libdlo hardcodes vsync start to 0 */ + wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); + + /* vsync end is width of vsync pulse */ + wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); + + /* vpixels is active pixels */ + wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); + + /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ + wrptr = dlfb_set_register_16be(wrptr, 0x1B, + 200*1000*1000/var->pixclock); + + return wrptr; +} + +/* + * This takes a standard fbdev screeninfo struct that was fetched or prepared + * and then generates the appropriate command sequence that then drives the + * display controller. + */ +static int dlfb_set_video_mode(struct dlfb_data *dlfb, + struct fb_var_screeninfo *var) +{ + char *buf; + char *wrptr; + int retval; + int writesize; + struct urb *urb; + + if (!atomic_read(&dlfb->usb_active)) + return -EPERM; + + urb = dlfb_get_urb(dlfb); + 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, dlfb->info->fix.smem_len); + + wrptr = dlfb_set_vid_cmds(wrptr, var); + wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK); + wrptr = dlfb_vidreg_unlock(wrptr); + + writesize = wrptr - buf; + + retval = dlfb_submit_urb(dlfb, urb, writesize); + + dlfb->blank_mode = FB_BLANK_UNBLANK; + + return retval; +} + +static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + unsigned long start = vma->vm_start; + unsigned long size = vma->vm_end - vma->vm_start; + unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; + unsigned long page, pos; + + if (info->fbdefio) + return fb_deferred_io_mmap(info, vma); + + if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) + return -EINVAL; + if (size > info->fix.smem_len) + return -EINVAL; + if (offset > info->fix.smem_len - size) + return -EINVAL; + + pos = (unsigned long)info->fix.smem_start + offset; + + dev_dbg(info->dev, "mmap() framebuffer addr:%lu size:%lu\n", + pos, size); + + while (size > 0) { + page = vmalloc_to_pfn((void *)pos); + if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) + return -EAGAIN; + + start += PAGE_SIZE; + pos += PAGE_SIZE; + if (size > PAGE_SIZE) + size -= PAGE_SIZE; + else + size = 0; + } + + return 0; +} + +/* + * Trims identical data from front and back of line + * Sets new front buffer address and width + * And returns byte count of identical pixels + * Assumes CPU natural alignment (unsigned long) + * for back and front buffer ptrs and width + */ +static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) +{ + int j, k; + const unsigned long *back = (const unsigned long *) bback; + const unsigned long *front = (const unsigned long *) *bfront; + const int width = *width_bytes / sizeof(unsigned long); + int identical; + int start = width; + int end = width; + + 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, + unsigned long back_buffer_offset, + int *ident_ptr) +{ + const uint16_t *pixel = *pixel_start_ptr; + uint32_t dev_addr = *device_address_ptr; + uint8_t *cmd = *command_buffer_ptr; + + while ((pixel_end > pixel) && + (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { + uint8_t *raw_pixels_count_byte = NULL; + uint8_t *cmd_pixels_count_byte = NULL; + const uint16_t *raw_pixel_start = NULL; + const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL; + + if (back_buffer_offset && + *pixel == *(u16 *)((u8 *)pixel + back_buffer_offset)) { + pixel++; + dev_addr += BPP; + (*ident_ptr)++; + continue; + } + + *cmd++ = 0xAF; + *cmd++ = 0x6B; + *cmd++ = dev_addr >> 16; + *cmd++ = dev_addr >> 8; + *cmd++ = dev_addr; + + 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 + min3(MAX_CMD_PIXELS + 1UL, + (unsigned long)(pixel_end - pixel), + (unsigned long)(cmd_buffer_end - 1 - cmd) / BPP); + + if (back_buffer_offset) { + /* note: the framebuffer may change under us, so we must test for underflow */ + while (cmd_pixel_end - 1 > pixel && + *(cmd_pixel_end - 1) == *(u16 *)((u8 *)(cmd_pixel_end - 1) + back_buffer_offset)) + cmd_pixel_end--; + } + + while (pixel < cmd_pixel_end) { + const uint16_t * const repeating_pixel = pixel; + u16 pixel_value = *pixel; + + put_unaligned_be16(pixel_value, cmd); + if (back_buffer_offset) + *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; + cmd += 2; + pixel++; + + if (unlikely((pixel < cmd_pixel_end) && + (*pixel == pixel_value))) { + /* go back and fill in raw pixel count */ + *raw_pixels_count_byte = ((repeating_pixel - + raw_pixel_start) + 1) & 0xFF; + + do { + if (back_buffer_offset) + *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; + pixel++; + } while ((pixel < cmd_pixel_end) && + (*pixel == pixel_value)); + + /* 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; + } else { + /* undo unused byte */ + cmd--; + } + + *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; + dev_addr += (u8 *)pixel - (u8 *)cmd_pixel_start; + } + + 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; +} + +/* + * There are 3 copies of every pixel: The front buffer that the fbdev + * client renders to, the actual framebuffer across the USB bus in hardware + * (that we can only write to, slowly, and can never read), and (optionally) + * our shadow copy that tracks what's been sent to that hardware buffer. + */ +static int dlfb_render_hline(struct dlfb_data *dlfb, 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 = dlfb->base16 + byte_offset; + struct urb *urb = *urb_ptr; + u8 *cmd = *urb_buf_ptr; + u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; + unsigned long back_buffer_offset = 0; + + line_start = (u8 *) (front + byte_offset); + next_pixel = line_start; + line_end = next_pixel + byte_width; + + if (dlfb->backing_buffer) { + int offset; + const u8 *back_start = (u8 *) (dlfb->backing_buffer + + byte_offset); + + back_buffer_offset = (unsigned long)back_start - (unsigned long)line_start; + + *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; + } + + 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, back_buffer_offset, + ident_ptr); + + if (cmd >= cmd_end) { + int len = cmd - (u8 *) urb->transfer_buffer; + if (dlfb_submit_urb(dlfb, urb, len)) + return 1; /* lost pixels is set */ + *sent_ptr += len; + urb = dlfb_get_urb(dlfb); + if (!urb) + return 1; /* lost_pixels is set */ + *urb_ptr = urb; + cmd = urb->transfer_buffer; + cmd_end = &cmd[urb->transfer_buffer_length]; + } + } + + *urb_buf_ptr = cmd; + + return 0; +} + +static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, int width, int height) +{ + 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(); + + mutex_lock(&dlfb->render_mutex); + + 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 > dlfb->info->var.xres) || + (y + height > dlfb->info->var.yres)) { + ret = -EINVAL; + goto unlock_ret; + } + + if (!atomic_read(&dlfb->usb_active)) { + ret = 0; + goto unlock_ret; + } + + urb = dlfb_get_urb(dlfb); + if (!urb) { + ret = 0; + goto unlock_ret; + } + cmd = urb->transfer_buffer; + + for (i = y; i < y + height ; i++) { + const int line_offset = dlfb->info->fix.line_length * i; + const int byte_offset = line_offset + (x * BPP); + + if (dlfb_render_hline(dlfb, &urb, + (char *) dlfb->info->fix.smem_start, + &cmd, byte_offset, width * BPP, + &bytes_identical, &bytes_sent)) + goto error; + } + + if (cmd > (char *) urb->transfer_buffer) { + int len; + if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) + *cmd++ = 0xAF; + /* Send partial buffer remaining before exiting */ + len = cmd - (char *) urb->transfer_buffer; + dlfb_submit_urb(dlfb, urb, len); + bytes_sent += len; + } else + dlfb_urb_completion(urb); + +error: + atomic_add(bytes_sent, &dlfb->bytes_sent); + atomic_add(bytes_identical, &dlfb->bytes_identical); + atomic_add(width*height*2, &dlfb->bytes_rendered); + end_cycles = get_cycles(); + atomic_add(((unsigned int) ((end_cycles - start_cycles) + >> 10)), /* Kcycles */ + &dlfb->cpu_kcycles_used); + + ret = 0; + +unlock_ret: + mutex_unlock(&dlfb->render_mutex); + return ret; +} + +static void dlfb_init_damage(struct dlfb_data *dlfb) +{ + dlfb->damage_x = INT_MAX; + dlfb->damage_x2 = 0; + dlfb->damage_y = INT_MAX; + dlfb->damage_y2 = 0; +} + +static void dlfb_damage_work(struct work_struct *w) +{ + struct dlfb_data *dlfb = container_of(w, struct dlfb_data, damage_work); + int x, x2, y, y2; + + spin_lock_irq(&dlfb->damage_lock); + x = dlfb->damage_x; + x2 = dlfb->damage_x2; + y = dlfb->damage_y; + y2 = dlfb->damage_y2; + dlfb_init_damage(dlfb); + spin_unlock_irq(&dlfb->damage_lock); + + if (x < x2 && y < y2) + dlfb_handle_damage(dlfb, x, y, x2 - x, y2 - y); +} + +static void dlfb_offload_damage(struct dlfb_data *dlfb, int x, int y, int width, int height) +{ + unsigned long flags; + int x2 = x + width; + int y2 = y + height; + + if (x >= x2 || y >= y2) + return; + + spin_lock_irqsave(&dlfb->damage_lock, flags); + dlfb->damage_x = min(x, dlfb->damage_x); + dlfb->damage_x2 = max(x2, dlfb->damage_x2); + dlfb->damage_y = min(y, dlfb->damage_y); + dlfb->damage_y2 = max(y2, dlfb->damage_y2); + spin_unlock_irqrestore(&dlfb->damage_lock, flags); + + schedule_work(&dlfb->damage_work); +} + +/* + * Path triggered by usermode clients who write to filesystem + * e.g. cat filename > /dev/fb1 + * Not used by X Windows or text-mode console. But useful for testing. + * Slow because of extra copy and we must assume all pixels dirty. + */ +static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf, + size_t count, loff_t *ppos) +{ + ssize_t result; + struct dlfb_data *dlfb = info->par; + u32 offset = (u32) *ppos; + + result = fb_sys_write(info, buf, count, ppos); + + if (result > 0) { + int start = max((int)(offset / info->fix.line_length), 0); + int lines = min((u32)((result / info->fix.line_length) + 1), + (u32)info->var.yres); + + dlfb_handle_damage(dlfb, 0, start, info->var.xres, + lines); + } + + return result; +} + +/* hardware has native COPY command (see libdlo), but not worth it for fbcon */ +static void dlfb_ops_copyarea(struct fb_info *info, + const struct fb_copyarea *area) +{ + + struct dlfb_data *dlfb = info->par; + + sys_copyarea(info, area); + + dlfb_offload_damage(dlfb, area->dx, area->dy, + area->width, area->height); +} + +static void dlfb_ops_imageblit(struct fb_info *info, + const struct fb_image *image) +{ + struct dlfb_data *dlfb = info->par; + + sys_imageblit(info, image); + + dlfb_offload_damage(dlfb, image->dx, image->dy, + image->width, image->height); +} + +static void dlfb_ops_fillrect(struct fb_info *info, + const struct fb_fillrect *rect) +{ + struct dlfb_data *dlfb = info->par; + + sys_fillrect(info, rect); + + dlfb_offload_damage(dlfb, rect->dx, rect->dy, rect->width, + rect->height); +} + +/* + * NOTE: fb_defio.c is holding info->fbdefio.mutex + * Touching ANY framebuffer memory that triggers a page fault + * in fb_defio will cause a deadlock, when it also tries to + * grab the same mutex. + */ +static void dlfb_dpy_deferred_io(struct fb_info *info, struct list_head *pagereflist) +{ + struct fb_deferred_io_pageref *pageref; + struct dlfb_data *dlfb = 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; + + mutex_lock(&dlfb->render_mutex); + + if (!fb_defio) + goto unlock_ret; + + if (!atomic_read(&dlfb->usb_active)) + goto unlock_ret; + + start_cycles = get_cycles(); + + urb = dlfb_get_urb(dlfb); + if (!urb) + goto unlock_ret; + + cmd = urb->transfer_buffer; + + /* walk the written page list and render each to device */ + list_for_each_entry(pageref, pagereflist, list) { + if (dlfb_render_hline(dlfb, &urb, (char *) info->fix.smem_start, + &cmd, pageref->offset, PAGE_SIZE, + &bytes_identical, &bytes_sent)) + goto error; + bytes_rendered += PAGE_SIZE; + } + + if (cmd > (char *) urb->transfer_buffer) { + int len; + if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) + *cmd++ = 0xAF; + /* Send partial buffer remaining before exiting */ + len = cmd - (char *) urb->transfer_buffer; + dlfb_submit_urb(dlfb, urb, len); + bytes_sent += len; + } else + dlfb_urb_completion(urb); + +error: + atomic_add(bytes_sent, &dlfb->bytes_sent); + atomic_add(bytes_identical, &dlfb->bytes_identical); + atomic_add(bytes_rendered, &dlfb->bytes_rendered); + end_cycles = get_cycles(); + atomic_add(((unsigned int) ((end_cycles - start_cycles) + >> 10)), /* Kcycles */ + &dlfb->cpu_kcycles_used); +unlock_ret: + mutex_unlock(&dlfb->render_mutex); +} + +static int dlfb_get_edid(struct dlfb_data *dlfb, char *edid, int len) +{ + int i, ret; + char *rbuf; + + rbuf = kmalloc(2, GFP_KERNEL); + if (!rbuf) + return 0; + + for (i = 0; i < len; i++) { + ret = usb_control_msg(dlfb->udev, + usb_rcvctrlpipe(dlfb->udev, 0), 0x02, + (0x80 | (0x02 << 5)), i << 8, 0xA1, + rbuf, 2, USB_CTRL_GET_TIMEOUT); + if (ret < 2) { + dev_err(&dlfb->udev->dev, + "Read EDID byte %d failed: %d\n", i, ret); + i--; + break; + } + edid[i] = rbuf[1]; + } + + kfree(rbuf); + + return i; +} + +static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, + unsigned long arg) +{ + + struct dlfb_data *dlfb = info->par; + + if (!atomic_read(&dlfb->usb_active)) + return 0; + + /* TODO: Update X server to get this from sysfs instead */ + if (cmd == DLFB_IOCTL_RETURN_EDID) { + void __user *edid = (void __user *)arg; + if (copy_to_user(edid, dlfb->edid, dlfb->edid_size)) + return -EFAULT; + return 0; + } + + /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ + if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { + struct dloarea area; + + if (copy_from_user(&area, (void __user *)arg, + sizeof(struct dloarea))) + return -EFAULT; + + /* + * If we have a damage-aware client, turn fb_defio "off" + * To avoid perf imact of unnecessary page fault handling. + * Done by resetting the delay for this fb_info to a very + * long period. Pages will become writable and stay that way. + * Reset to normal value when all clients have closed this fb. + */ + if (info->fbdefio) + info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE; + + if (area.x < 0) + area.x = 0; + + if (area.x > info->var.xres) + area.x = info->var.xres; + + if (area.y < 0) + area.y = 0; + + if (area.y > info->var.yres) + area.y = info->var.yres; + + dlfb_handle_damage(dlfb, area.x, area.y, area.w, area.h); + } + + return 0; +} + +/* taken from vesafb */ +static int +dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, + unsigned blue, unsigned transp, struct fb_info *info) +{ + int err = 0; + + if (regno >= info->cmap.len) + return 1; + + if (regno < 16) { + if (info->var.red.offset == 10) { + /* 1:5:5:5 */ + ((u32 *) (info->pseudo_palette))[regno] = + ((red & 0xf800) >> 1) | + ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); + } else { + /* 0:5:6:5 */ + ((u32 *) (info->pseudo_palette))[regno] = + ((red & 0xf800)) | + ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); + } + } + + return err; +} + +/* + * It's common for several clients to have framebuffer open simultaneously. + * e.g. both fbcon and X. Makes things interesting. + * Assumes caller is holding info->lock (for open and release at least) + */ +static int dlfb_ops_open(struct fb_info *info, int user) +{ + struct dlfb_data *dlfb = info->par; + + /* + * fbcon aggressively connects to first framebuffer it finds, + * preventing other clients (X) from working properly. Usually + * not what the user wants. Fail by default with option to enable. + */ + if ((user == 0) && (!console)) + return -EBUSY; + + /* If the USB device is gone, we don't accept new opens */ + if (dlfb->virtualized) + return -ENODEV; + + dlfb->fb_count++; + + if (fb_defio && (info->fbdefio == NULL)) { + /* enable defio at last moment if not disabled by client */ + + struct fb_deferred_io *fbdefio; + + fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL); + + if (fbdefio) { + fbdefio->delay = DL_DEFIO_WRITE_DELAY; + fbdefio->sort_pagereflist = true; + fbdefio->deferred_io = dlfb_dpy_deferred_io; + } + + info->fbdefio = fbdefio; + fb_deferred_io_init(info); + } + + dev_dbg(info->dev, "open, user=%d fb_info=%p count=%d\n", + user, info, dlfb->fb_count); + + return 0; +} + +static void dlfb_ops_destroy(struct fb_info *info) +{ + struct dlfb_data *dlfb = info->par; + + cancel_work_sync(&dlfb->damage_work); + + mutex_destroy(&dlfb->render_mutex); + + if (info->cmap.len != 0) + fb_dealloc_cmap(&info->cmap); + if (info->monspecs.modedb) + fb_destroy_modedb(info->monspecs.modedb); + vfree(info->screen_base); + + fb_destroy_modelist(&info->modelist); + + while (!list_empty(&dlfb->deferred_free)) { + struct dlfb_deferred_free *d = list_entry(dlfb->deferred_free.next, struct dlfb_deferred_free, list); + list_del(&d->list); + vfree(d->mem); + kfree(d); + } + vfree(dlfb->backing_buffer); + kfree(dlfb->edid); + dlfb_free_urb_list(dlfb); + usb_put_dev(dlfb->udev); + kfree(dlfb); + + /* Assume info structure is freed after this point */ + framebuffer_release(info); +} + +/* + * Assumes caller is holding info->lock mutex (for open and release at least) + */ +static int dlfb_ops_release(struct fb_info *info, int user) +{ + struct dlfb_data *dlfb = info->par; + + dlfb->fb_count--; + + if ((dlfb->fb_count == 0) && (info->fbdefio)) { + fb_deferred_io_cleanup(info); + kfree(info->fbdefio); + info->fbdefio = NULL; + } + + dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count); + + return 0; +} + +/* + * Check whether a video mode is supported by the DisplayLink chip + * We start from monitor's modes, so don't need to filter that here + */ +static int dlfb_is_valid_mode(struct fb_videomode *mode, struct dlfb_data *dlfb) +{ + if (mode->xres * mode->yres > dlfb->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; + struct dlfb_data *dlfb = info->par; + + /* 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, dlfb)) + return -EINVAL; + + return 0; +} + +static int dlfb_ops_set_par(struct fb_info *info) +{ + struct dlfb_data *dlfb = info->par; + int result; + u16 *pix_framebuffer; + int i; + struct fb_var_screeninfo fvs; + u32 line_length = info->var.xres * (info->var.bits_per_pixel / 8); + + /* clear the activate field because it causes spurious miscompares */ + fvs = info->var; + fvs.activate = 0; + fvs.vmode &= ~FB_VMODE_SMOOTH_XPAN; + + if (!memcmp(&dlfb->current_mode, &fvs, sizeof(struct fb_var_screeninfo))) + return 0; + + result = dlfb_realloc_framebuffer(dlfb, info, info->var.yres * line_length); + if (result) + return result; + + result = dlfb_set_video_mode(dlfb, &info->var); + + if (result) + return result; + + dlfb->current_mode = fvs; + info->fix.line_length = line_length; + + if (dlfb->fb_count == 0) { + + /* paint greenscreen */ + + pix_framebuffer = (u16 *) info->screen_base; + for (i = 0; i < info->fix.smem_len / 2; i++) + pix_framebuffer[i] = 0x37e6; + } + + dlfb_handle_damage(dlfb, 0, 0, info->var.xres, info->var.yres); + + return 0; +} + +/* To fonzi the jukebox (e.g. make blanking changes take effect) */ +static char *dlfb_dummy_render(char *buf) +{ + *buf++ = 0xAF; + *buf++ = 0x6A; /* copy */ + *buf++ = 0x00; /* from address*/ + *buf++ = 0x00; + *buf++ = 0x00; + *buf++ = 0x01; /* one pixel */ + *buf++ = 0x00; /* to address */ + *buf++ = 0x00; + *buf++ = 0x00; + return buf; +} + +/* + * In order to come back from full DPMS off, we need to set the mode again + */ +static int dlfb_ops_blank(int blank_mode, struct fb_info *info) +{ + struct dlfb_data *dlfb = info->par; + char *bufptr; + struct urb *urb; + + dev_dbg(info->dev, "blank, mode %d --> %d\n", + dlfb->blank_mode, blank_mode); + + if ((dlfb->blank_mode == FB_BLANK_POWERDOWN) && + (blank_mode != FB_BLANK_POWERDOWN)) { + + /* returning from powerdown requires a fresh modeset */ + dlfb_set_video_mode(dlfb, &info->var); + } + + urb = dlfb_get_urb(dlfb); + if (!urb) + return 0; + + bufptr = (char *) urb->transfer_buffer; + bufptr = dlfb_vidreg_lock(bufptr); + bufptr = dlfb_blanking(bufptr, blank_mode); + bufptr = dlfb_vidreg_unlock(bufptr); + + /* seems like a render op is needed to have blank change take effect */ + bufptr = dlfb_dummy_render(bufptr); + + dlfb_submit_urb(dlfb, urb, bufptr - + (char *) urb->transfer_buffer); + + dlfb->blank_mode = blank_mode; + + return 0; +} + +static const struct fb_ops dlfb_ops = { + .owner = THIS_MODULE, + .fb_read = fb_sys_read, + .fb_write = dlfb_ops_write, + .fb_setcolreg = dlfb_ops_setcolreg, + .fb_fillrect = dlfb_ops_fillrect, + .fb_copyarea = dlfb_ops_copyarea, + .fb_imageblit = dlfb_ops_imageblit, + .fb_mmap = dlfb_ops_mmap, + .fb_ioctl = dlfb_ops_ioctl, + .fb_open = dlfb_ops_open, + .fb_release = dlfb_ops_release, + .fb_blank = dlfb_ops_blank, + .fb_check_var = dlfb_ops_check_var, + .fb_set_par = dlfb_ops_set_par, + .fb_destroy = dlfb_ops_destroy, +}; + + +static void dlfb_deferred_vfree(struct dlfb_data *dlfb, void *mem) +{ + struct dlfb_deferred_free *d = kmalloc(sizeof(struct dlfb_deferred_free), GFP_KERNEL); + if (!d) + return; + d->mem = mem; + list_add(&d->list, &dlfb->deferred_free); +} + +/* + * Assumes &info->lock held by caller + * Assumes no active clients have framebuffer open + */ +static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len) +{ + u32 old_len = info->fix.smem_len; + const void *old_fb = (const void __force *)info->screen_base; + unsigned char *new_fb; + unsigned char *new_back = NULL; + + new_len = PAGE_ALIGN(new_len); + + if (new_len > old_len) { + /* + * Alloc system memory for virtual framebuffer + */ + new_fb = vmalloc(new_len); + if (!new_fb) { + dev_err(info->dev, "Virtual framebuffer alloc failed\n"); + return -ENOMEM; + } + memset(new_fb, 0xff, new_len); + + if (info->screen_base) { + memcpy(new_fb, old_fb, old_len); + dlfb_deferred_vfree(dlfb, (void __force *)info->screen_base); + } + + info->screen_base = (char __iomem *)new_fb; + info->fix.smem_len = new_len; + info->fix.smem_start = (unsigned long) new_fb; + info->flags = udlfb_info_flags; + + /* + * Second framebuffer copy to mirror the framebuffer state + * on the physical USB device. We can function without this. + * But with imperfect damage info we may send pixels over USB + * that were, in fact, unchanged - wasting limited USB bandwidth + */ + if (shadow) + new_back = vzalloc(new_len); + if (!new_back) + dev_info(info->dev, + "No shadow/backing buffer allocated\n"); + else { + dlfb_deferred_vfree(dlfb, dlfb->backing_buffer); + dlfb->backing_buffer = new_back; + } + } + return 0; +} + +/* + * 1) Get EDID from hw, or use sw default + * 2) Parse into various fb_info structs + * 3) Allocate virtual framebuffer memory to back highest res mode + * + * Parses EDID into three places used by various parts of fbdev: + * fb_var_screeninfo contains the timing of the monitor's preferred mode + * fb_info.monspecs is full parsed EDID info, including monspecs.modedb + * fb_info.modelist is a linked list of all monitor & VESA modes which work + * + * If EDID is not readable/valid, then modelist is all VESA modes, + * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode + * Returns 0 if successful + */ +static int dlfb_setup_modes(struct dlfb_data *dlfb, + struct fb_info *info, + char *default_edid, size_t default_edid_size) +{ + char *edid; + int i, result = 0, tries = 3; + struct device *dev = info->device; + struct fb_videomode *mode; + const struct fb_videomode *default_vmode = NULL; + + if (info->dev) { + /* only use mutex if info has been registered */ + mutex_lock(&info->lock); + /* parent device is used otherwise */ + dev = info->dev; + } + + edid = kmalloc(EDID_LENGTH, GFP_KERNEL); + if (!edid) { + result = -ENOMEM; + goto error; + } + + fb_destroy_modelist(&info->modelist); + memset(&info->monspecs, 0, sizeof(info->monspecs)); + + /* + * Try to (re)read EDID from hardware first + * EDID data may return, but not parse as valid + * Try again a few times, in case of e.g. analog cable noise + */ + while (tries--) { + + i = dlfb_get_edid(dlfb, edid, EDID_LENGTH); + + if (i >= EDID_LENGTH) + fb_edid_to_monspecs(edid, &info->monspecs); + + if (info->monspecs.modedb_len > 0) { + dlfb->edid = edid; + dlfb->edid_size = i; + break; + } + } + + /* If that fails, use a previously returned EDID if available */ + if (info->monspecs.modedb_len == 0) { + dev_err(dev, "Unable to get valid EDID from device/display\n"); + + if (dlfb->edid) { + fb_edid_to_monspecs(dlfb->edid, &info->monspecs); + if (info->monspecs.modedb_len > 0) + dev_err(dev, "Using previously queried EDID\n"); + } + } + + /* If that fails, use the default EDID we were handed */ + if (info->monspecs.modedb_len == 0) { + if (default_edid_size >= EDID_LENGTH) { + fb_edid_to_monspecs(default_edid, &info->monspecs); + if (info->monspecs.modedb_len > 0) { + memcpy(edid, default_edid, default_edid_size); + dlfb->edid = edid; + dlfb->edid_size = default_edid_size; + dev_err(dev, "Using default/backup EDID\n"); + } + } + } + + /* If we've got modes, let's pick a best default mode */ + if (info->monspecs.modedb_len > 0) { + + for (i = 0; i < info->monspecs.modedb_len; i++) { + mode = &info->monspecs.modedb[i]; + if (dlfb_is_valid_mode(mode, dlfb)) { + fb_add_videomode(mode, &info->modelist); + } else { + dev_dbg(dev, "Specified mode %dx%d too big\n", + mode->xres, mode->yres); + if (i == 0) + /* if we've removed top/best mode */ + info->monspecs.misc + &= ~FB_MISC_1ST_DETAIL; + } + } + + default_vmode = fb_find_best_display(&info->monspecs, + &info->modelist); + } + + /* If everything else has failed, fall back to safe default mode */ + if (default_vmode == NULL) { + + struct fb_videomode fb_vmode = {0}; + + /* + * Add the standard VESA modes to our modelist + * Since we don't have EDID, there may be modes that + * overspec monitor and/or are incorrect aspect ratio, etc. + * But at least the user has a chance to choose + */ + for (i = 0; i < VESA_MODEDB_SIZE; i++) { + mode = (struct fb_videomode *)&vesa_modes[i]; + if (dlfb_is_valid_mode(mode, dlfb)) + fb_add_videomode(mode, &info->modelist); + else + dev_dbg(dev, "VESA mode %dx%d too big\n", + mode->xres, mode->yres); + } + + /* + * default to resolution safe for projectors + * (since they are most common case without EDID) + */ + fb_vmode.xres = 800; + fb_vmode.yres = 600; + fb_vmode.refresh = 60; + default_vmode = fb_find_nearest_mode(&fb_vmode, + &info->modelist); + } + + /* If we have good mode and no active clients*/ + if ((default_vmode != NULL) && (dlfb->fb_count == 0)) { + + fb_videomode_to_var(&info->var, default_vmode); + dlfb_var_color_format(&info->var); + + /* + * with mode size info, we can now alloc our framebuffer. + */ + memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix)); + } else + result = -EINVAL; + +error: + if (edid && (dlfb->edid != edid)) + kfree(edid); + + if (info->dev) + mutex_unlock(&info->lock); + + return result; +} + +static ssize_t metrics_bytes_rendered_show(struct device *fbdev, + struct device_attribute *a, char *buf) { + struct fb_info *fb_info = dev_get_drvdata(fbdev); + struct dlfb_data *dlfb = fb_info->par; + return sysfs_emit(buf, "%u\n", + atomic_read(&dlfb->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 *dlfb = fb_info->par; + return sysfs_emit(buf, "%u\n", + atomic_read(&dlfb->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 *dlfb = fb_info->par; + return sysfs_emit(buf, "%u\n", + atomic_read(&dlfb->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 *dlfb = fb_info->par; + return sysfs_emit(buf, "%u\n", + atomic_read(&dlfb->cpu_kcycles_used)); +} + +static ssize_t edid_show( + struct file *filp, + struct kobject *kobj, struct bin_attribute *a, + char *buf, loff_t off, size_t count) { + struct device *fbdev = kobj_to_dev(kobj); + struct fb_info *fb_info = dev_get_drvdata(fbdev); + struct dlfb_data *dlfb = fb_info->par; + + if (dlfb->edid == NULL) + return 0; + + if ((off >= dlfb->edid_size) || (count > dlfb->edid_size)) + return 0; + + if (off + count > dlfb->edid_size) + count = dlfb->edid_size - off; + + memcpy(buf, dlfb->edid, count); + + return count; +} + +static ssize_t edid_store( + struct file *filp, + struct kobject *kobj, struct bin_attribute *a, + char *src, loff_t src_off, size_t src_size) { + struct device *fbdev = kobj_to_dev(kobj); + struct fb_info *fb_info = dev_get_drvdata(fbdev); + struct dlfb_data *dlfb = fb_info->par; + int ret; + + /* We only support write of entire EDID at once, no offset*/ + if ((src_size != EDID_LENGTH) || (src_off != 0)) + return -EINVAL; + + ret = dlfb_setup_modes(dlfb, fb_info, src, src_size); + if (ret) + return ret; + + if (!dlfb->edid || memcmp(src, dlfb->edid, src_size)) + return -EINVAL; + + ret = dlfb_ops_set_par(fb_info); + if (ret) + return ret; + + return src_size; +} + +static ssize_t metrics_reset_store(struct device *fbdev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fb_info *fb_info = dev_get_drvdata(fbdev); + struct dlfb_data *dlfb = fb_info->par; + + atomic_set(&dlfb->bytes_rendered, 0); + atomic_set(&dlfb->bytes_identical, 0); + atomic_set(&dlfb->bytes_sent, 0); + atomic_set(&dlfb->cpu_kcycles_used, 0); + + return count; +} + +static const struct bin_attribute edid_attr = { + .attr.name = "edid", + .attr.mode = 0666, + .size = EDID_LENGTH, + .read = edid_show, + .write = edid_store +}; + +static const struct device_attribute fb_device_attrs[] = { + __ATTR_RO(metrics_bytes_rendered), + __ATTR_RO(metrics_bytes_identical), + __ATTR_RO(metrics_bytes_sent), + __ATTR_RO(metrics_cpu_kcycles_used), + __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store), +}; + +/* + * This is necessary before we can communicate with the display controller. + */ +static int dlfb_select_std_channel(struct dlfb_data *dlfb) +{ + int ret; + void *buf; + static const u8 set_def_chn[] = { + 0x57, 0xCD, 0xDC, 0xA7, + 0x1C, 0x88, 0x5E, 0x15, + 0x60, 0xFE, 0xC6, 0x97, + 0x16, 0x3D, 0x47, 0xF2 }; + + buf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL); + + if (!buf) + return -ENOMEM; + + ret = usb_control_msg(dlfb->udev, usb_sndctrlpipe(dlfb->udev, 0), + NR_USB_REQUEST_CHANNEL, + (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, + buf, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT); + + kfree(buf); + + return ret; +} + +static int dlfb_parse_vendor_descriptor(struct dlfb_data *dlfb, + struct usb_interface *intf) +{ + char *desc; + char *buf; + char *desc_end; + int total_len; + + buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); + if (!buf) + return false; + desc = buf; + + total_len = usb_get_descriptor(interface_to_usbdev(intf), + 0x5f, /* vendor specific */ + 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); + + /* if not found, look in configuration descriptor */ + if (total_len < 0) { + if (0 == usb_get_extra_descriptor(intf->cur_altsetting, + 0x5f, &desc)) + total_len = (int) desc[0]; + } + + if (total_len > 5) { + dev_info(&intf->dev, + "vendor descriptor length: %d data: %11ph\n", + total_len, desc); + + if ((desc[0] != total_len) || /* descriptor length */ + (desc[1] != 0x5f) || /* vendor descriptor type */ + (desc[2] != 0x01) || /* version (2 bytes) */ + (desc[3] != 0x00) || + (desc[4] != total_len - 2)) /* length after type */ + goto unrecognized; + + desc_end = desc + total_len; + desc += 5; /* the fixed header we've already parsed */ + + while (desc < desc_end) { + u8 length; + u16 key; + + key = *desc++; + key |= (u16)*desc++ << 8; + length = *desc++; + + switch (key) { + case 0x0200: { /* max_area */ + u32 max_area = *desc++; + max_area |= (u32)*desc++ << 8; + max_area |= (u32)*desc++ << 16; + max_area |= (u32)*desc++ << 24; + dev_warn(&intf->dev, + "DL chip limited to %d pixel modes\n", + max_area); + dlfb->sku_pixel_limit = max_area; + break; + } + default: + break; + } + desc += length; + } + } else { + dev_info(&intf->dev, "vendor descriptor not available (%d)\n", + total_len); + } + + goto success; + +unrecognized: + /* allow udlfb to load for now even if firmware unrecognized */ + dev_err(&intf->dev, "Unrecognized vendor firmware descriptor\n"); + +success: + kfree(buf); + return true; +} + +static int dlfb_usb_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + int i; + const struct device_attribute *attr; + struct dlfb_data *dlfb; + struct fb_info *info; + int retval; + struct usb_device *usbdev = interface_to_usbdev(intf); + static u8 out_ep[] = {OUT_EP_NUM + USB_DIR_OUT, 0}; + + /* usb initialization */ + dlfb = kzalloc(sizeof(*dlfb), GFP_KERNEL); + if (!dlfb) { + dev_err(&intf->dev, "%s: failed to allocate dlfb\n", __func__); + return -ENOMEM; + } + + INIT_LIST_HEAD(&dlfb->deferred_free); + + dlfb->udev = usb_get_dev(usbdev); + usb_set_intfdata(intf, dlfb); + + if (!usb_check_bulk_endpoints(intf, out_ep)) { + dev_err(&intf->dev, "Invalid DisplayLink device!\n"); + retval = -EINVAL; + goto error; + } + + dev_dbg(&intf->dev, "console enable=%d\n", console); + dev_dbg(&intf->dev, "fb_defio enable=%d\n", fb_defio); + dev_dbg(&intf->dev, "shadow enable=%d\n", shadow); + + dlfb->sku_pixel_limit = 2048 * 1152; /* default to maximum */ + + if (!dlfb_parse_vendor_descriptor(dlfb, intf)) { + dev_err(&intf->dev, + "firmware not recognized, incompatible device?\n"); + retval = -ENODEV; + goto error; + } + + if (pixel_limit) { + dev_warn(&intf->dev, + "DL chip limit of %d overridden to %d\n", + dlfb->sku_pixel_limit, pixel_limit); + dlfb->sku_pixel_limit = pixel_limit; + } + + + /* allocates framebuffer driver structure, not framebuffer memory */ + info = framebuffer_alloc(0, &dlfb->udev->dev); + if (!info) { + retval = -ENOMEM; + goto error; + } + + dlfb->info = info; + info->par = dlfb; + info->pseudo_palette = dlfb->pseudo_palette; + dlfb->ops = dlfb_ops; + info->fbops = &dlfb->ops; + + mutex_init(&dlfb->render_mutex); + dlfb_init_damage(dlfb); + spin_lock_init(&dlfb->damage_lock); + INIT_WORK(&dlfb->damage_work, dlfb_damage_work); + + INIT_LIST_HEAD(&info->modelist); + + if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) { + retval = -ENOMEM; + dev_err(&intf->dev, "unable to allocate urb list\n"); + goto error; + } + + /* We don't register a new USB class. Our client interface is dlfbev */ + + retval = fb_alloc_cmap(&info->cmap, 256, 0); + if (retval < 0) { + dev_err(info->device, "cmap allocation failed: %d\n", retval); + goto error; + } + + retval = dlfb_setup_modes(dlfb, info, NULL, 0); + if (retval != 0) { + dev_err(info->device, + "unable to find common mode for display and adapter\n"); + goto error; + } + + /* ready to begin using device */ + + atomic_set(&dlfb->usb_active, 1); + dlfb_select_std_channel(dlfb); + + dlfb_ops_check_var(&info->var, info); + retval = dlfb_ops_set_par(info); + if (retval) + goto error; + + retval = register_framebuffer(info); + if (retval < 0) { + dev_err(info->device, "unable to register framebuffer: %d\n", + retval); + goto error; + } + + for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) { + attr = &fb_device_attrs[i]; + retval = device_create_file(info->dev, attr); + if (retval) + dev_warn(info->device, + "failed to create '%s' attribute: %d\n", + attr->attr.name, retval); + } + + retval = device_create_bin_file(info->dev, &edid_attr); + if (retval) + dev_warn(info->device, "failed to create '%s' attribute: %d\n", + edid_attr.attr.name, retval); + + dev_info(info->device, + "%s is DisplayLink USB device (%dx%d, %dK framebuffer memory)\n", + dev_name(info->dev), info->var.xres, info->var.yres, + ((dlfb->backing_buffer) ? + info->fix.smem_len * 2 : info->fix.smem_len) >> 10); + return 0; + +error: + if (dlfb->info) { + dlfb_ops_destroy(dlfb->info); + } else { + usb_put_dev(dlfb->udev); + kfree(dlfb); + } + return retval; +} + +static void dlfb_usb_disconnect(struct usb_interface *intf) +{ + struct dlfb_data *dlfb; + struct fb_info *info; + int i; + + dlfb = usb_get_intfdata(intf); + info = dlfb->info; + + dev_dbg(&intf->dev, "USB disconnect starting\n"); + + /* we virtualize until all fb clients release. Then we free */ + dlfb->virtualized = true; + + /* When non-active we'll update virtual framebuffer, but no new urbs */ + atomic_set(&dlfb->usb_active, 0); + + /* this function will wait for all in-flight urbs to complete */ + dlfb_free_urb_list(dlfb); + + /* remove udlfb's sysfs interfaces */ + for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) + device_remove_file(info->dev, &fb_device_attrs[i]); + device_remove_bin_file(info->dev, &edid_attr); + + unregister_framebuffer(info); +} + +static struct usb_driver dlfb_driver = { + .name = "udlfb", + .probe = dlfb_usb_probe, + .disconnect = dlfb_usb_disconnect, + .id_table = id_table, +}; + +module_usb_driver(dlfb_driver); + +static void dlfb_urb_completion(struct urb *urb) +{ + struct urb_node *unode = urb->context; + struct dlfb_data *dlfb = unode->dlfb; + unsigned long flags; + + switch (urb->status) { + case 0: + /* success */ + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + /* sync/async unlink faults aren't errors */ + break; + default: + dev_err(&dlfb->udev->dev, + "%s - nonzero write bulk status received: %d\n", + __func__, urb->status); + atomic_set(&dlfb->lost_pixels, 1); + break; + } + + urb->transfer_buffer_length = dlfb->urbs.size; /* reset to actual */ + + spin_lock_irqsave(&dlfb->urbs.lock, flags); + list_add_tail(&unode->entry, &dlfb->urbs.list); + dlfb->urbs.available++; + spin_unlock_irqrestore(&dlfb->urbs.lock, flags); + + up(&dlfb->urbs.limit_sem); +} + +static void dlfb_free_urb_list(struct dlfb_data *dlfb) +{ + int count = dlfb->urbs.count; + struct list_head *node; + struct urb_node *unode; + struct urb *urb; + + /* keep waiting and freeing, until we've got 'em all */ + while (count--) { + down(&dlfb->urbs.limit_sem); + + spin_lock_irq(&dlfb->urbs.lock); + + node = dlfb->urbs.list.next; /* have reserved one with sem */ + list_del_init(node); + + spin_unlock_irq(&dlfb->urbs.lock); + + unode = list_entry(node, struct urb_node, entry); + urb = unode->urb; + + /* Free each separately allocated piece */ + usb_free_coherent(urb->dev, dlfb->urbs.size, + urb->transfer_buffer, urb->transfer_dma); + usb_free_urb(urb); + kfree(node); + } + + dlfb->urbs.count = 0; +} + +static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size) +{ + struct urb *urb; + struct urb_node *unode; + char *buf; + size_t wanted_size = count * size; + + spin_lock_init(&dlfb->urbs.lock); + +retry: + dlfb->urbs.size = size; + INIT_LIST_HEAD(&dlfb->urbs.list); + + sema_init(&dlfb->urbs.limit_sem, 0); + dlfb->urbs.count = 0; + dlfb->urbs.available = 0; + + while (dlfb->urbs.count * size < wanted_size) { + unode = kzalloc(sizeof(*unode), GFP_KERNEL); + if (!unode) + break; + unode->dlfb = dlfb; + + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + kfree(unode); + break; + } + unode->urb = urb; + + buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL, + &urb->transfer_dma); + if (!buf) { + kfree(unode); + usb_free_urb(urb); + if (size > PAGE_SIZE) { + size /= 2; + dlfb_free_urb_list(dlfb); + goto retry; + } + break; + } + + /* urb->transfer_buffer_length set to actual before submit */ + usb_fill_bulk_urb(urb, dlfb->udev, + usb_sndbulkpipe(dlfb->udev, OUT_EP_NUM), + buf, size, dlfb_urb_completion, unode); + urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + + list_add_tail(&unode->entry, &dlfb->urbs.list); + + up(&dlfb->urbs.limit_sem); + dlfb->urbs.count++; + dlfb->urbs.available++; + } + + return dlfb->urbs.count; +} + +static struct urb *dlfb_get_urb(struct dlfb_data *dlfb) +{ + int ret; + struct list_head *entry; + struct urb_node *unode; + + /* Wait for an in-flight buffer to complete and get re-queued */ + ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT); + if (ret) { + atomic_set(&dlfb->lost_pixels, 1); + dev_warn(&dlfb->udev->dev, + "wait for urb interrupted: %d available: %d\n", + ret, dlfb->urbs.available); + return NULL; + } + + spin_lock_irq(&dlfb->urbs.lock); + + BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */ + entry = dlfb->urbs.list.next; + list_del_init(entry); + dlfb->urbs.available--; + + spin_unlock_irq(&dlfb->urbs.lock); + + unode = list_entry(entry, struct urb_node, entry); + return unode->urb; +} + +static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb *urb, size_t len) +{ + int ret; + + BUG_ON(len > dlfb->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(&dlfb->lost_pixels, 1); + dev_err(&dlfb->udev->dev, "submit urb error: %d\n", ret); + } + return ret; +} + +module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); +MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer"); + +module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); +MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes"); + +module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); +MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf"); + +module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); +MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)"); + +MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, " + "Jaya Kumar <jayakumar.lkml@gmail.com>, " + "Bernie Thompson <bernie@plugable.com>"); +MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); +MODULE_LICENSE("GPL"); + |