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2005 lines
47 KiB
2005 lines
47 KiB
/* |
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* linux/drivers/video/fbmem.c |
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* |
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* Copyright (C) 1994 Martin Schaller |
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* |
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* 2001 - Documented with DocBook |
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* - Brad Douglas <[email protected]> |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/module.h> |
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#include <linux/compat.h> |
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#include <linux/types.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/major.h> |
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#include <linux/slab.h> |
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#include <linux/mm.h> |
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#include <linux/mman.h> |
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#include <linux/vt.h> |
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#include <linux/init.h> |
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#include <linux/linux_logo.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/console.h> |
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#include <linux/kmod.h> |
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#include <linux/err.h> |
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#include <linux/device.h> |
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#include <linux/efi.h> |
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#include <linux/fb.h> |
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#include <linux/fbcon.h> |
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#include <linux/mem_encrypt.h> |
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#include <linux/pci.h> |
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#include <asm/fb.h> |
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/* |
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* Frame buffer device initialization and setup routines |
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*/ |
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#define FBPIXMAPSIZE (1024 * 8) |
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static DEFINE_MUTEX(registration_lock); |
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struct fb_info *registered_fb[FB_MAX] __read_mostly; |
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EXPORT_SYMBOL(registered_fb); |
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int num_registered_fb __read_mostly; |
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EXPORT_SYMBOL(num_registered_fb); |
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bool fb_center_logo __read_mostly; |
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int fb_logo_count __read_mostly = -1; |
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static struct fb_info *get_fb_info(unsigned int idx) |
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{ |
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struct fb_info *fb_info; |
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if (idx >= FB_MAX) |
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return ERR_PTR(-ENODEV); |
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mutex_lock(®istration_lock); |
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fb_info = registered_fb[idx]; |
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if (fb_info) |
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refcount_inc(&fb_info->count); |
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mutex_unlock(®istration_lock); |
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return fb_info; |
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} |
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static void put_fb_info(struct fb_info *fb_info) |
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{ |
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if (!refcount_dec_and_test(&fb_info->count)) |
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return; |
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if (fb_info->fbops->fb_destroy) |
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fb_info->fbops->fb_destroy(fb_info); |
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} |
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/* |
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* Helpers |
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*/ |
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int fb_get_color_depth(struct fb_var_screeninfo *var, |
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struct fb_fix_screeninfo *fix) |
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{ |
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int depth = 0; |
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if (fix->visual == FB_VISUAL_MONO01 || |
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fix->visual == FB_VISUAL_MONO10) |
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depth = 1; |
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else { |
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if (var->green.length == var->blue.length && |
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var->green.length == var->red.length && |
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var->green.offset == var->blue.offset && |
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var->green.offset == var->red.offset) |
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depth = var->green.length; |
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else |
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depth = var->green.length + var->red.length + |
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var->blue.length; |
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} |
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return depth; |
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} |
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EXPORT_SYMBOL(fb_get_color_depth); |
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/* |
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* Data padding functions. |
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*/ |
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void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) |
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{ |
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__fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); |
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} |
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EXPORT_SYMBOL(fb_pad_aligned_buffer); |
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void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, |
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u32 shift_high, u32 shift_low, u32 mod) |
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{ |
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u8 mask = (u8) (0xfff << shift_high), tmp; |
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int i, j; |
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for (i = height; i--; ) { |
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for (j = 0; j < idx; j++) { |
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tmp = dst[j]; |
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tmp &= mask; |
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tmp |= *src >> shift_low; |
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dst[j] = tmp; |
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tmp = *src << shift_high; |
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dst[j+1] = tmp; |
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src++; |
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} |
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tmp = dst[idx]; |
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tmp &= mask; |
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tmp |= *src >> shift_low; |
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dst[idx] = tmp; |
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if (shift_high < mod) { |
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tmp = *src << shift_high; |
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dst[idx+1] = tmp; |
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} |
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src++; |
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dst += d_pitch; |
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} |
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} |
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EXPORT_SYMBOL(fb_pad_unaligned_buffer); |
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/* |
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* we need to lock this section since fb_cursor |
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* may use fb_imageblit() |
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*/ |
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char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) |
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{ |
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u32 align = buf->buf_align - 1, offset; |
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char *addr = buf->addr; |
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/* If IO mapped, we need to sync before access, no sharing of |
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* the pixmap is done |
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*/ |
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if (buf->flags & FB_PIXMAP_IO) { |
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if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) |
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info->fbops->fb_sync(info); |
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return addr; |
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} |
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/* See if we fit in the remaining pixmap space */ |
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offset = buf->offset + align; |
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offset &= ~align; |
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if (offset + size > buf->size) { |
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/* We do not fit. In order to be able to re-use the buffer, |
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* we must ensure no asynchronous DMA'ing or whatever operation |
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* is in progress, we sync for that. |
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*/ |
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if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) |
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info->fbops->fb_sync(info); |
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offset = 0; |
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} |
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buf->offset = offset + size; |
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addr += offset; |
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return addr; |
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} |
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EXPORT_SYMBOL(fb_get_buffer_offset); |
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#ifdef CONFIG_LOGO |
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static inline unsigned safe_shift(unsigned d, int n) |
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{ |
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return n < 0 ? d >> -n : d << n; |
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} |
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static void fb_set_logocmap(struct fb_info *info, |
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const struct linux_logo *logo) |
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{ |
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struct fb_cmap palette_cmap; |
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u16 palette_green[16]; |
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u16 palette_blue[16]; |
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u16 palette_red[16]; |
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int i, j, n; |
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const unsigned char *clut = logo->clut; |
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palette_cmap.start = 0; |
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palette_cmap.len = 16; |
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palette_cmap.red = palette_red; |
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palette_cmap.green = palette_green; |
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palette_cmap.blue = palette_blue; |
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palette_cmap.transp = NULL; |
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for (i = 0; i < logo->clutsize; i += n) { |
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n = logo->clutsize - i; |
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/* palette_cmap provides space for only 16 colors at once */ |
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if (n > 16) |
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n = 16; |
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palette_cmap.start = 32 + i; |
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palette_cmap.len = n; |
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for (j = 0; j < n; ++j) { |
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palette_cmap.red[j] = clut[0] << 8 | clut[0]; |
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palette_cmap.green[j] = clut[1] << 8 | clut[1]; |
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palette_cmap.blue[j] = clut[2] << 8 | clut[2]; |
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clut += 3; |
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} |
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fb_set_cmap(&palette_cmap, info); |
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} |
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} |
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static void fb_set_logo_truepalette(struct fb_info *info, |
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const struct linux_logo *logo, |
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u32 *palette) |
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{ |
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static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; |
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unsigned char redmask, greenmask, bluemask; |
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int redshift, greenshift, blueshift; |
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int i; |
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const unsigned char *clut = logo->clut; |
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/* |
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* We have to create a temporary palette since console palette is only |
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* 16 colors long. |
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*/ |
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/* Bug: Doesn't obey msb_right ... (who needs that?) */ |
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redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; |
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greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; |
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bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; |
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redshift = info->var.red.offset - (8 - info->var.red.length); |
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greenshift = info->var.green.offset - (8 - info->var.green.length); |
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blueshift = info->var.blue.offset - (8 - info->var.blue.length); |
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for ( i = 0; i < logo->clutsize; i++) { |
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palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | |
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safe_shift((clut[1] & greenmask), greenshift) | |
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safe_shift((clut[2] & bluemask), blueshift)); |
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clut += 3; |
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} |
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} |
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static void fb_set_logo_directpalette(struct fb_info *info, |
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const struct linux_logo *logo, |
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u32 *palette) |
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{ |
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int redshift, greenshift, blueshift; |
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int i; |
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redshift = info->var.red.offset; |
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greenshift = info->var.green.offset; |
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blueshift = info->var.blue.offset; |
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for (i = 32; i < 32 + logo->clutsize; i++) |
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palette[i] = i << redshift | i << greenshift | i << blueshift; |
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} |
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static void fb_set_logo(struct fb_info *info, |
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const struct linux_logo *logo, u8 *dst, |
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int depth) |
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{ |
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int i, j, k; |
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const u8 *src = logo->data; |
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u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; |
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u8 fg = 1, d; |
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switch (fb_get_color_depth(&info->var, &info->fix)) { |
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case 1: |
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fg = 1; |
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break; |
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case 2: |
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fg = 3; |
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break; |
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default: |
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fg = 7; |
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break; |
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} |
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if (info->fix.visual == FB_VISUAL_MONO01 || |
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info->fix.visual == FB_VISUAL_MONO10) |
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fg = ~((u8) (0xfff << info->var.green.length)); |
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switch (depth) { |
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case 4: |
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for (i = 0; i < logo->height; i++) |
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for (j = 0; j < logo->width; src++) { |
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*dst++ = *src >> 4; |
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j++; |
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if (j < logo->width) { |
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*dst++ = *src & 0x0f; |
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j++; |
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} |
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} |
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break; |
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case 1: |
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for (i = 0; i < logo->height; i++) { |
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for (j = 0; j < logo->width; src++) { |
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d = *src ^ xor; |
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for (k = 7; k >= 0 && j < logo->width; k--) { |
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*dst++ = ((d >> k) & 1) ? fg : 0; |
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j++; |
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} |
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} |
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} |
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break; |
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} |
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} |
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/* |
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* Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), |
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* linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on |
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* the visual format and color depth of the framebuffer, the DAC, the |
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* pseudo_palette, and the logo data will be adjusted accordingly. |
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* |
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* Case 1 - linux_logo_clut224: |
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* Color exceeds the number of console colors (16), thus we set the hardware DAC |
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* using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. |
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* |
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* For visuals that require color info from the pseudo_palette, we also construct |
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* one for temporary use. The "needs_directpalette" or "needs_truepalette" flags |
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* will be set. |
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* |
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* Case 2 - linux_logo_vga16: |
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* The number of colors just matches the console colors, thus there is no need |
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* to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, |
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* each byte contains color information for two pixels (upper and lower nibble). |
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* To be consistent with fb_imageblit() usage, we therefore separate the two |
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* nibbles into separate bytes. The "depth" flag will be set to 4. |
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* |
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* Case 3 - linux_logo_mono: |
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* This is similar with Case 2. Each byte contains information for 8 pixels. |
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* We isolate each bit and expand each into a byte. The "depth" flag will |
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* be set to 1. |
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*/ |
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static struct logo_data { |
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int depth; |
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int needs_directpalette; |
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int needs_truepalette; |
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int needs_cmapreset; |
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const struct linux_logo *logo; |
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} fb_logo __read_mostly; |
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static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) |
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{ |
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u32 size = width * height, i; |
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out += size - 1; |
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for (i = size; i--; ) |
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*out-- = *in++; |
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} |
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static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) |
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{ |
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int i, j, h = height - 1; |
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for (i = 0; i < height; i++) |
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for (j = 0; j < width; j++) |
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out[height * j + h - i] = *in++; |
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} |
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static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) |
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{ |
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int i, j, w = width - 1; |
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for (i = 0; i < height; i++) |
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for (j = 0; j < width; j++) |
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out[height * (w - j) + i] = *in++; |
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} |
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static void fb_rotate_logo(struct fb_info *info, u8 *dst, |
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struct fb_image *image, int rotate) |
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{ |
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u32 tmp; |
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if (rotate == FB_ROTATE_UD) { |
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fb_rotate_logo_ud(image->data, dst, image->width, |
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image->height); |
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image->dx = info->var.xres - image->width - image->dx; |
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image->dy = info->var.yres - image->height - image->dy; |
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} else if (rotate == FB_ROTATE_CW) { |
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fb_rotate_logo_cw(image->data, dst, image->width, |
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image->height); |
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tmp = image->width; |
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image->width = image->height; |
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image->height = tmp; |
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tmp = image->dy; |
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image->dy = image->dx; |
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image->dx = info->var.xres - image->width - tmp; |
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} else if (rotate == FB_ROTATE_CCW) { |
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fb_rotate_logo_ccw(image->data, dst, image->width, |
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image->height); |
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tmp = image->width; |
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image->width = image->height; |
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image->height = tmp; |
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tmp = image->dx; |
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image->dx = image->dy; |
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image->dy = info->var.yres - image->height - tmp; |
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} |
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image->data = dst; |
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} |
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static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, |
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int rotate, unsigned int num) |
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{ |
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unsigned int x; |
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if (image->width > info->var.xres || image->height > info->var.yres) |
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return; |
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if (rotate == FB_ROTATE_UR) { |
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for (x = 0; |
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x < num && image->dx + image->width <= info->var.xres; |
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x++) { |
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info->fbops->fb_imageblit(info, image); |
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image->dx += image->width + 8; |
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} |
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} else if (rotate == FB_ROTATE_UD) { |
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u32 dx = image->dx; |
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for (x = 0; x < num && image->dx <= dx; x++) { |
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info->fbops->fb_imageblit(info, image); |
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image->dx -= image->width + 8; |
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} |
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} else if (rotate == FB_ROTATE_CW) { |
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for (x = 0; |
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x < num && image->dy + image->height <= info->var.yres; |
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x++) { |
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info->fbops->fb_imageblit(info, image); |
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image->dy += image->height + 8; |
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} |
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} else if (rotate == FB_ROTATE_CCW) { |
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u32 dy = image->dy; |
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for (x = 0; x < num && image->dy <= dy; x++) { |
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info->fbops->fb_imageblit(info, image); |
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image->dy -= image->height + 8; |
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} |
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} |
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} |
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static int fb_show_logo_line(struct fb_info *info, int rotate, |
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const struct linux_logo *logo, int y, |
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unsigned int n) |
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{ |
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u32 *palette = NULL, *saved_pseudo_palette = NULL; |
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unsigned char *logo_new = NULL, *logo_rotate = NULL; |
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struct fb_image image; |
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/* Return if the frame buffer is not mapped or suspended */ |
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if (logo == NULL || info->state != FBINFO_STATE_RUNNING || |
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info->fbops->owner) |
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return 0; |
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image.depth = 8; |
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image.data = logo->data; |
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if (fb_logo.needs_cmapreset) |
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fb_set_logocmap(info, logo); |
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if (fb_logo.needs_truepalette || |
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fb_logo.needs_directpalette) { |
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palette = kmalloc(256 * 4, GFP_KERNEL); |
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if (palette == NULL) |
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return 0; |
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if (fb_logo.needs_truepalette) |
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fb_set_logo_truepalette(info, logo, palette); |
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else |
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fb_set_logo_directpalette(info, logo, palette); |
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saved_pseudo_palette = info->pseudo_palette; |
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info->pseudo_palette = palette; |
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} |
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if (fb_logo.depth <= 4) { |
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logo_new = kmalloc_array(logo->width, logo->height, |
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GFP_KERNEL); |
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if (logo_new == NULL) { |
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kfree(palette); |
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if (saved_pseudo_palette) |
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info->pseudo_palette = saved_pseudo_palette; |
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return 0; |
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} |
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image.data = logo_new; |
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fb_set_logo(info, logo, logo_new, fb_logo.depth); |
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} |
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if (fb_center_logo) { |
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int xres = info->var.xres; |
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int yres = info->var.yres; |
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if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) { |
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xres = info->var.yres; |
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yres = info->var.xres; |
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} |
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while (n && (n * (logo->width + 8) - 8 > xres)) |
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--n; |
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image.dx = (xres - n * (logo->width + 8) - 8) / 2; |
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image.dy = y ?: (yres - logo->height) / 2; |
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} else { |
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image.dx = 0; |
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image.dy = y; |
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} |
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image.width = logo->width; |
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image.height = logo->height; |
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if (rotate) { |
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logo_rotate = kmalloc_array(logo->width, logo->height, |
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GFP_KERNEL); |
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if (logo_rotate) |
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fb_rotate_logo(info, logo_rotate, &image, rotate); |
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} |
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fb_do_show_logo(info, &image, rotate, n); |
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kfree(palette); |
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if (saved_pseudo_palette != NULL) |
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info->pseudo_palette = saved_pseudo_palette; |
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kfree(logo_new); |
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kfree(logo_rotate); |
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return image.dy + logo->height; |
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} |
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#ifdef CONFIG_FB_LOGO_EXTRA |
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#define FB_LOGO_EX_NUM_MAX 10 |
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static struct logo_data_extra { |
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const struct linux_logo *logo; |
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unsigned int n; |
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} fb_logo_ex[FB_LOGO_EX_NUM_MAX]; |
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static unsigned int fb_logo_ex_num; |
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void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) |
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{ |
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if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) |
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return; |
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fb_logo_ex[fb_logo_ex_num].logo = logo; |
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fb_logo_ex[fb_logo_ex_num].n = n; |
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fb_logo_ex_num++; |
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} |
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|
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static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, |
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unsigned int yres) |
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{ |
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unsigned int i; |
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|
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/* FIXME: logo_ex supports only truecolor fb. */ |
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if (info->fix.visual != FB_VISUAL_TRUECOLOR) |
|
fb_logo_ex_num = 0; |
|
|
|
for (i = 0; i < fb_logo_ex_num; i++) { |
|
if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { |
|
fb_logo_ex[i].logo = NULL; |
|
continue; |
|
} |
|
height += fb_logo_ex[i].logo->height; |
|
if (height > yres) { |
|
height -= fb_logo_ex[i].logo->height; |
|
fb_logo_ex_num = i; |
|
break; |
|
} |
|
} |
|
return height; |
|
} |
|
|
|
static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) |
|
{ |
|
unsigned int i; |
|
|
|
for (i = 0; i < fb_logo_ex_num; i++) |
|
y = fb_show_logo_line(info, rotate, |
|
fb_logo_ex[i].logo, y, fb_logo_ex[i].n); |
|
|
|
return y; |
|
} |
|
|
|
#else /* !CONFIG_FB_LOGO_EXTRA */ |
|
|
|
static inline int fb_prepare_extra_logos(struct fb_info *info, |
|
unsigned int height, |
|
unsigned int yres) |
|
{ |
|
return height; |
|
} |
|
|
|
static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) |
|
{ |
|
return y; |
|
} |
|
|
|
#endif /* CONFIG_FB_LOGO_EXTRA */ |
|
|
|
|
|
int fb_prepare_logo(struct fb_info *info, int rotate) |
|
{ |
|
int depth = fb_get_color_depth(&info->var, &info->fix); |
|
unsigned int yres; |
|
int height; |
|
|
|
memset(&fb_logo, 0, sizeof(struct logo_data)); |
|
|
|
if (info->flags & FBINFO_MISC_TILEBLITTING || |
|
info->fbops->owner || !fb_logo_count) |
|
return 0; |
|
|
|
if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { |
|
depth = info->var.blue.length; |
|
if (info->var.red.length < depth) |
|
depth = info->var.red.length; |
|
if (info->var.green.length < depth) |
|
depth = info->var.green.length; |
|
} |
|
|
|
if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { |
|
/* assume console colormap */ |
|
depth = 4; |
|
} |
|
|
|
/* Return if no suitable logo was found */ |
|
fb_logo.logo = fb_find_logo(depth); |
|
|
|
if (!fb_logo.logo) { |
|
return 0; |
|
} |
|
|
|
if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) |
|
yres = info->var.yres; |
|
else |
|
yres = info->var.xres; |
|
|
|
if (fb_logo.logo->height > yres) { |
|
fb_logo.logo = NULL; |
|
return 0; |
|
} |
|
|
|
/* What depth we asked for might be different from what we get */ |
|
if (fb_logo.logo->type == LINUX_LOGO_CLUT224) |
|
fb_logo.depth = 8; |
|
else if (fb_logo.logo->type == LINUX_LOGO_VGA16) |
|
fb_logo.depth = 4; |
|
else |
|
fb_logo.depth = 1; |
|
|
|
|
|
if (fb_logo.depth > 4 && depth > 4) { |
|
switch (info->fix.visual) { |
|
case FB_VISUAL_TRUECOLOR: |
|
fb_logo.needs_truepalette = 1; |
|
break; |
|
case FB_VISUAL_DIRECTCOLOR: |
|
fb_logo.needs_directpalette = 1; |
|
fb_logo.needs_cmapreset = 1; |
|
break; |
|
case FB_VISUAL_PSEUDOCOLOR: |
|
fb_logo.needs_cmapreset = 1; |
|
break; |
|
} |
|
} |
|
|
|
height = fb_logo.logo->height; |
|
if (fb_center_logo) |
|
height += (yres - fb_logo.logo->height) / 2; |
|
|
|
return fb_prepare_extra_logos(info, height, yres); |
|
} |
|
|
|
int fb_show_logo(struct fb_info *info, int rotate) |
|
{ |
|
unsigned int count; |
|
int y; |
|
|
|
if (!fb_logo_count) |
|
return 0; |
|
|
|
count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count; |
|
y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count); |
|
y = fb_show_extra_logos(info, y, rotate); |
|
|
|
return y; |
|
} |
|
#else |
|
int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } |
|
int fb_show_logo(struct fb_info *info, int rotate) { return 0; } |
|
#endif /* CONFIG_LOGO */ |
|
EXPORT_SYMBOL(fb_prepare_logo); |
|
EXPORT_SYMBOL(fb_show_logo); |
|
|
|
static void *fb_seq_start(struct seq_file *m, loff_t *pos) |
|
{ |
|
mutex_lock(®istration_lock); |
|
return (*pos < FB_MAX) ? pos : NULL; |
|
} |
|
|
|
static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos) |
|
{ |
|
(*pos)++; |
|
return (*pos < FB_MAX) ? pos : NULL; |
|
} |
|
|
|
static void fb_seq_stop(struct seq_file *m, void *v) |
|
{ |
|
mutex_unlock(®istration_lock); |
|
} |
|
|
|
static int fb_seq_show(struct seq_file *m, void *v) |
|
{ |
|
int i = *(loff_t *)v; |
|
struct fb_info *fi = registered_fb[i]; |
|
|
|
if (fi) |
|
seq_printf(m, "%d %s\n", fi->node, fi->fix.id); |
|
return 0; |
|
} |
|
|
|
static const struct seq_operations __maybe_unused proc_fb_seq_ops = { |
|
.start = fb_seq_start, |
|
.next = fb_seq_next, |
|
.stop = fb_seq_stop, |
|
.show = fb_seq_show, |
|
}; |
|
|
|
/* |
|
* We hold a reference to the fb_info in file->private_data, |
|
* but if the current registered fb has changed, we don't |
|
* actually want to use it. |
|
* |
|
* So look up the fb_info using the inode minor number, |
|
* and just verify it against the reference we have. |
|
*/ |
|
static struct fb_info *file_fb_info(struct file *file) |
|
{ |
|
struct inode *inode = file_inode(file); |
|
int fbidx = iminor(inode); |
|
struct fb_info *info = registered_fb[fbidx]; |
|
|
|
if (info != file->private_data) |
|
info = NULL; |
|
return info; |
|
} |
|
|
|
static ssize_t |
|
fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
|
{ |
|
unsigned long p = *ppos; |
|
struct fb_info *info = file_fb_info(file); |
|
u8 *buffer, *dst; |
|
u8 __iomem *src; |
|
int c, cnt = 0, err = 0; |
|
unsigned long total_size; |
|
|
|
if (!info || ! info->screen_base) |
|
return -ENODEV; |
|
|
|
if (info->state != FBINFO_STATE_RUNNING) |
|
return -EPERM; |
|
|
|
if (info->fbops->fb_read) |
|
return info->fbops->fb_read(info, buf, count, ppos); |
|
|
|
total_size = info->screen_size; |
|
|
|
if (total_size == 0) |
|
total_size = info->fix.smem_len; |
|
|
|
if (p >= total_size) |
|
return 0; |
|
|
|
if (count >= total_size) |
|
count = total_size; |
|
|
|
if (count + p > total_size) |
|
count = total_size - p; |
|
|
|
buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, |
|
GFP_KERNEL); |
|
if (!buffer) |
|
return -ENOMEM; |
|
|
|
src = (u8 __iomem *) (info->screen_base + p); |
|
|
|
if (info->fbops->fb_sync) |
|
info->fbops->fb_sync(info); |
|
|
|
while (count) { |
|
c = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
|
dst = buffer; |
|
fb_memcpy_fromfb(dst, src, c); |
|
dst += c; |
|
src += c; |
|
|
|
if (copy_to_user(buf, buffer, c)) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
*ppos += c; |
|
buf += c; |
|
cnt += c; |
|
count -= c; |
|
} |
|
|
|
kfree(buffer); |
|
|
|
return (err) ? err : cnt; |
|
} |
|
|
|
static ssize_t |
|
fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
|
{ |
|
unsigned long p = *ppos; |
|
struct fb_info *info = file_fb_info(file); |
|
u8 *buffer, *src; |
|
u8 __iomem *dst; |
|
int c, cnt = 0, err = 0; |
|
unsigned long total_size; |
|
|
|
if (!info || !info->screen_base) |
|
return -ENODEV; |
|
|
|
if (info->state != FBINFO_STATE_RUNNING) |
|
return -EPERM; |
|
|
|
if (info->fbops->fb_write) |
|
return info->fbops->fb_write(info, buf, count, ppos); |
|
|
|
total_size = info->screen_size; |
|
|
|
if (total_size == 0) |
|
total_size = info->fix.smem_len; |
|
|
|
if (p > total_size) |
|
return -EFBIG; |
|
|
|
if (count > total_size) { |
|
err = -EFBIG; |
|
count = total_size; |
|
} |
|
|
|
if (count + p > total_size) { |
|
if (!err) |
|
err = -ENOSPC; |
|
|
|
count = total_size - p; |
|
} |
|
|
|
buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, |
|
GFP_KERNEL); |
|
if (!buffer) |
|
return -ENOMEM; |
|
|
|
dst = (u8 __iomem *) (info->screen_base + p); |
|
|
|
if (info->fbops->fb_sync) |
|
info->fbops->fb_sync(info); |
|
|
|
while (count) { |
|
c = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
|
src = buffer; |
|
|
|
if (copy_from_user(src, buf, c)) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
|
|
fb_memcpy_tofb(dst, src, c); |
|
dst += c; |
|
src += c; |
|
*ppos += c; |
|
buf += c; |
|
cnt += c; |
|
count -= c; |
|
} |
|
|
|
kfree(buffer); |
|
|
|
return (cnt) ? cnt : err; |
|
} |
|
|
|
int |
|
fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) |
|
{ |
|
struct fb_fix_screeninfo *fix = &info->fix; |
|
unsigned int yres = info->var.yres; |
|
int err = 0; |
|
|
|
if (var->yoffset > 0) { |
|
if (var->vmode & FB_VMODE_YWRAP) { |
|
if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) |
|
err = -EINVAL; |
|
else |
|
yres = 0; |
|
} else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) |
|
err = -EINVAL; |
|
} |
|
|
|
if (var->xoffset > 0 && (!fix->xpanstep || |
|
(var->xoffset % fix->xpanstep))) |
|
err = -EINVAL; |
|
|
|
if (err || !info->fbops->fb_pan_display || |
|
var->yoffset > info->var.yres_virtual - yres || |
|
var->xoffset > info->var.xres_virtual - info->var.xres) |
|
return -EINVAL; |
|
|
|
if ((err = info->fbops->fb_pan_display(var, info))) |
|
return err; |
|
info->var.xoffset = var->xoffset; |
|
info->var.yoffset = var->yoffset; |
|
if (var->vmode & FB_VMODE_YWRAP) |
|
info->var.vmode |= FB_VMODE_YWRAP; |
|
else |
|
info->var.vmode &= ~FB_VMODE_YWRAP; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(fb_pan_display); |
|
|
|
static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, |
|
u32 activate) |
|
{ |
|
struct fb_blit_caps caps, fbcaps; |
|
int err = 0; |
|
|
|
memset(&caps, 0, sizeof(caps)); |
|
memset(&fbcaps, 0, sizeof(fbcaps)); |
|
caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; |
|
fbcon_get_requirement(info, &caps); |
|
info->fbops->fb_get_caps(info, &fbcaps, var); |
|
|
|
if (((fbcaps.x ^ caps.x) & caps.x) || |
|
((fbcaps.y ^ caps.y) & caps.y) || |
|
(fbcaps.len < caps.len)) |
|
err = -EINVAL; |
|
|
|
return err; |
|
} |
|
|
|
int |
|
fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) |
|
{ |
|
int ret = 0; |
|
u32 activate; |
|
struct fb_var_screeninfo old_var; |
|
struct fb_videomode mode; |
|
struct fb_event event; |
|
u32 unused; |
|
|
|
if (var->activate & FB_ACTIVATE_INV_MODE) { |
|
struct fb_videomode mode1, mode2; |
|
|
|
fb_var_to_videomode(&mode1, var); |
|
fb_var_to_videomode(&mode2, &info->var); |
|
/* make sure we don't delete the videomode of current var */ |
|
ret = fb_mode_is_equal(&mode1, &mode2); |
|
if (!ret) { |
|
ret = fbcon_mode_deleted(info, &mode1); |
|
if (!ret) |
|
fb_delete_videomode(&mode1, &info->modelist); |
|
} |
|
|
|
return ret ? -EINVAL : 0; |
|
} |
|
|
|
if (!(var->activate & FB_ACTIVATE_FORCE) && |
|
!memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) |
|
return 0; |
|
|
|
activate = var->activate; |
|
|
|
/* When using FOURCC mode, make sure the red, green, blue and |
|
* transp fields are set to 0. |
|
*/ |
|
if ((info->fix.capabilities & FB_CAP_FOURCC) && |
|
var->grayscale > 1) { |
|
if (var->red.offset || var->green.offset || |
|
var->blue.offset || var->transp.offset || |
|
var->red.length || var->green.length || |
|
var->blue.length || var->transp.length || |
|
var->red.msb_right || var->green.msb_right || |
|
var->blue.msb_right || var->transp.msb_right) |
|
return -EINVAL; |
|
} |
|
|
|
if (!info->fbops->fb_check_var) { |
|
*var = info->var; |
|
return 0; |
|
} |
|
|
|
/* bitfill_aligned() assumes that it's at least 8x8 */ |
|
if (var->xres < 8 || var->yres < 8) |
|
return -EINVAL; |
|
|
|
/* Too huge resolution causes multiplication overflow. */ |
|
if (check_mul_overflow(var->xres, var->yres, &unused) || |
|
check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused)) |
|
return -EINVAL; |
|
|
|
ret = info->fbops->fb_check_var(var, info); |
|
|
|
if (ret) |
|
return ret; |
|
|
|
if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW) |
|
return 0; |
|
|
|
if (info->fbops->fb_get_caps) { |
|
ret = fb_check_caps(info, var, activate); |
|
|
|
if (ret) |
|
return ret; |
|
} |
|
|
|
old_var = info->var; |
|
info->var = *var; |
|
|
|
if (info->fbops->fb_set_par) { |
|
ret = info->fbops->fb_set_par(info); |
|
|
|
if (ret) { |
|
info->var = old_var; |
|
printk(KERN_WARNING "detected " |
|
"fb_set_par error, " |
|
"error code: %d\n", ret); |
|
return ret; |
|
} |
|
} |
|
|
|
fb_pan_display(info, &info->var); |
|
fb_set_cmap(&info->cmap, info); |
|
fb_var_to_videomode(&mode, &info->var); |
|
|
|
if (info->modelist.prev && info->modelist.next && |
|
!list_empty(&info->modelist)) |
|
ret = fb_add_videomode(&mode, &info->modelist); |
|
|
|
if (ret) |
|
return ret; |
|
|
|
event.info = info; |
|
event.data = &mode; |
|
fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(fb_set_var); |
|
|
|
int |
|
fb_blank(struct fb_info *info, int blank) |
|
{ |
|
struct fb_event event; |
|
int ret = -EINVAL; |
|
|
|
if (blank > FB_BLANK_POWERDOWN) |
|
blank = FB_BLANK_POWERDOWN; |
|
|
|
event.info = info; |
|
event.data = ␣ |
|
|
|
if (info->fbops->fb_blank) |
|
ret = info->fbops->fb_blank(blank, info); |
|
|
|
if (!ret) |
|
fb_notifier_call_chain(FB_EVENT_BLANK, &event); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(fb_blank); |
|
|
|
static int fb_copyarea_user(struct fb_info *info, |
|
struct fb_copyarea *copy) |
|
{ |
|
int ret = 0; |
|
lock_fb_info(info); |
|
if (copy->dx >= info->var.xres || |
|
copy->sx >= info->var.xres || |
|
copy->width > info->var.xres || |
|
copy->dy >= info->var.yres || |
|
copy->sy >= info->var.yres || |
|
copy->height > info->var.yres || |
|
copy->dx + copy->width > info->var.xres || |
|
copy->sx + copy->width > info->var.xres || |
|
copy->dy + copy->height > info->var.yres || |
|
copy->sy + copy->height > info->var.yres) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
info->fbops->fb_copyarea(info, copy); |
|
out: |
|
unlock_fb_info(info); |
|
return ret; |
|
} |
|
|
|
static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
const struct fb_ops *fb; |
|
struct fb_var_screeninfo var; |
|
struct fb_fix_screeninfo fix; |
|
struct fb_cmap cmap_from; |
|
struct fb_cmap_user cmap; |
|
struct fb_copyarea copy; |
|
void __user *argp = (void __user *)arg; |
|
long ret = 0; |
|
|
|
switch (cmd) { |
|
case FBIOGET_VSCREENINFO: |
|
lock_fb_info(info); |
|
var = info->var; |
|
unlock_fb_info(info); |
|
|
|
ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; |
|
break; |
|
case FBIOPUT_VSCREENINFO: |
|
if (copy_from_user(&var, argp, sizeof(var))) |
|
return -EFAULT; |
|
console_lock(); |
|
lock_fb_info(info); |
|
ret = fb_set_var(info, &var); |
|
if (!ret) |
|
fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL); |
|
unlock_fb_info(info); |
|
console_unlock(); |
|
if (!ret && copy_to_user(argp, &var, sizeof(var))) |
|
ret = -EFAULT; |
|
break; |
|
case FBIOGET_FSCREENINFO: |
|
lock_fb_info(info); |
|
memcpy(&fix, &info->fix, sizeof(fix)); |
|
if (info->flags & FBINFO_HIDE_SMEM_START) |
|
fix.smem_start = 0; |
|
unlock_fb_info(info); |
|
|
|
ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; |
|
break; |
|
case FBIOPUTCMAP: |
|
if (copy_from_user(&cmap, argp, sizeof(cmap))) |
|
return -EFAULT; |
|
ret = fb_set_user_cmap(&cmap, info); |
|
break; |
|
case FBIOGETCMAP: |
|
if (copy_from_user(&cmap, argp, sizeof(cmap))) |
|
return -EFAULT; |
|
lock_fb_info(info); |
|
cmap_from = info->cmap; |
|
unlock_fb_info(info); |
|
ret = fb_cmap_to_user(&cmap_from, &cmap); |
|
break; |
|
case FBIOPAN_DISPLAY: |
|
if (copy_from_user(&var, argp, sizeof(var))) |
|
return -EFAULT; |
|
console_lock(); |
|
lock_fb_info(info); |
|
ret = fb_pan_display(info, &var); |
|
unlock_fb_info(info); |
|
console_unlock(); |
|
if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) |
|
return -EFAULT; |
|
break; |
|
case FBIO_CURSOR: |
|
ret = -EINVAL; |
|
break; |
|
case FBIOGET_CON2FBMAP: |
|
ret = fbcon_get_con2fb_map_ioctl(argp); |
|
break; |
|
case FBIOPUT_CON2FBMAP: |
|
ret = fbcon_set_con2fb_map_ioctl(argp); |
|
break; |
|
case FBIOBLANK: |
|
console_lock(); |
|
lock_fb_info(info); |
|
ret = fb_blank(info, arg); |
|
/* might again call into fb_blank */ |
|
fbcon_fb_blanked(info, arg); |
|
unlock_fb_info(info); |
|
console_unlock(); |
|
break; |
|
case FBIOCOPYAREA: |
|
if (info->flags & FBINFO_HWACCEL_COPYAREA) { |
|
/* only provide this ioctl if it is accelerated */ |
|
if (copy_from_user(©, argp, sizeof(copy))) |
|
return -EFAULT; |
|
ret = fb_copyarea_user(info, ©); |
|
break; |
|
} |
|
fallthrough; |
|
default: |
|
lock_fb_info(info); |
|
fb = info->fbops; |
|
if (fb->fb_ioctl) |
|
ret = fb->fb_ioctl(info, cmd, arg); |
|
else |
|
ret = -ENOTTY; |
|
unlock_fb_info(info); |
|
} |
|
return ret; |
|
} |
|
|
|
static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
|
{ |
|
struct fb_info *info = file_fb_info(file); |
|
|
|
if (!info) |
|
return -ENODEV; |
|
return do_fb_ioctl(info, cmd, arg); |
|
} |
|
|
|
#ifdef CONFIG_COMPAT |
|
struct fb_fix_screeninfo32 { |
|
char id[16]; |
|
compat_caddr_t smem_start; |
|
u32 smem_len; |
|
u32 type; |
|
u32 type_aux; |
|
u32 visual; |
|
u16 xpanstep; |
|
u16 ypanstep; |
|
u16 ywrapstep; |
|
u32 line_length; |
|
compat_caddr_t mmio_start; |
|
u32 mmio_len; |
|
u32 accel; |
|
u16 reserved[3]; |
|
}; |
|
|
|
struct fb_cmap32 { |
|
u32 start; |
|
u32 len; |
|
compat_caddr_t red; |
|
compat_caddr_t green; |
|
compat_caddr_t blue; |
|
compat_caddr_t transp; |
|
}; |
|
|
|
static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
struct fb_cmap32 cmap32; |
|
struct fb_cmap cmap_from; |
|
struct fb_cmap_user cmap; |
|
|
|
if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32))) |
|
return -EFAULT; |
|
|
|
cmap = (struct fb_cmap_user) { |
|
.start = cmap32.start, |
|
.len = cmap32.len, |
|
.red = compat_ptr(cmap32.red), |
|
.green = compat_ptr(cmap32.green), |
|
.blue = compat_ptr(cmap32.blue), |
|
.transp = compat_ptr(cmap32.transp), |
|
}; |
|
|
|
if (cmd == FBIOPUTCMAP) |
|
return fb_set_user_cmap(&cmap, info); |
|
|
|
lock_fb_info(info); |
|
cmap_from = info->cmap; |
|
unlock_fb_info(info); |
|
|
|
return fb_cmap_to_user(&cmap_from, &cmap); |
|
} |
|
|
|
static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, |
|
struct fb_fix_screeninfo32 __user *fix32) |
|
{ |
|
__u32 data; |
|
int err; |
|
|
|
err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); |
|
|
|
data = (__u32) (unsigned long) fix->smem_start; |
|
err |= put_user(data, &fix32->smem_start); |
|
|
|
err |= put_user(fix->smem_len, &fix32->smem_len); |
|
err |= put_user(fix->type, &fix32->type); |
|
err |= put_user(fix->type_aux, &fix32->type_aux); |
|
err |= put_user(fix->visual, &fix32->visual); |
|
err |= put_user(fix->xpanstep, &fix32->xpanstep); |
|
err |= put_user(fix->ypanstep, &fix32->ypanstep); |
|
err |= put_user(fix->ywrapstep, &fix32->ywrapstep); |
|
err |= put_user(fix->line_length, &fix32->line_length); |
|
|
|
data = (__u32) (unsigned long) fix->mmio_start; |
|
err |= put_user(data, &fix32->mmio_start); |
|
|
|
err |= put_user(fix->mmio_len, &fix32->mmio_len); |
|
err |= put_user(fix->accel, &fix32->accel); |
|
err |= copy_to_user(fix32->reserved, fix->reserved, |
|
sizeof(fix->reserved)); |
|
|
|
if (err) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
struct fb_fix_screeninfo fix; |
|
|
|
lock_fb_info(info); |
|
fix = info->fix; |
|
if (info->flags & FBINFO_HIDE_SMEM_START) |
|
fix.smem_start = 0; |
|
unlock_fb_info(info); |
|
return do_fscreeninfo_to_user(&fix, compat_ptr(arg)); |
|
} |
|
|
|
static long fb_compat_ioctl(struct file *file, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
struct fb_info *info = file_fb_info(file); |
|
const struct fb_ops *fb; |
|
long ret = -ENOIOCTLCMD; |
|
|
|
if (!info) |
|
return -ENODEV; |
|
fb = info->fbops; |
|
switch(cmd) { |
|
case FBIOGET_VSCREENINFO: |
|
case FBIOPUT_VSCREENINFO: |
|
case FBIOPAN_DISPLAY: |
|
case FBIOGET_CON2FBMAP: |
|
case FBIOPUT_CON2FBMAP: |
|
case FBIOCOPYAREA: |
|
arg = (unsigned long) compat_ptr(arg); |
|
fallthrough; |
|
case FBIOBLANK: |
|
ret = do_fb_ioctl(info, cmd, arg); |
|
break; |
|
|
|
case FBIOGET_FSCREENINFO: |
|
ret = fb_get_fscreeninfo(info, cmd, arg); |
|
break; |
|
|
|
case FBIOGETCMAP: |
|
case FBIOPUTCMAP: |
|
ret = fb_getput_cmap(info, cmd, arg); |
|
break; |
|
|
|
default: |
|
if (fb->fb_compat_ioctl) |
|
ret = fb->fb_compat_ioctl(info, cmd, arg); |
|
break; |
|
} |
|
return ret; |
|
} |
|
#endif |
|
|
|
static int |
|
fb_mmap(struct file *file, struct vm_area_struct * vma) |
|
{ |
|
struct fb_info *info = file_fb_info(file); |
|
int (*fb_mmap_fn)(struct fb_info *info, struct vm_area_struct *vma); |
|
unsigned long mmio_pgoff; |
|
unsigned long start; |
|
u32 len; |
|
|
|
if (!info) |
|
return -ENODEV; |
|
mutex_lock(&info->mm_lock); |
|
|
|
fb_mmap_fn = info->fbops->fb_mmap; |
|
|
|
#if IS_ENABLED(CONFIG_FB_DEFERRED_IO) |
|
if (info->fbdefio) |
|
fb_mmap_fn = fb_deferred_io_mmap; |
|
#endif |
|
|
|
if (fb_mmap_fn) { |
|
int res; |
|
|
|
/* |
|
* The framebuffer needs to be accessed decrypted, be sure |
|
* SME protection is removed ahead of the call |
|
*/ |
|
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); |
|
res = fb_mmap_fn(info, vma); |
|
mutex_unlock(&info->mm_lock); |
|
return res; |
|
} |
|
|
|
/* |
|
* Ugh. This can be either the frame buffer mapping, or |
|
* if pgoff points past it, the mmio mapping. |
|
*/ |
|
start = info->fix.smem_start; |
|
len = info->fix.smem_len; |
|
mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; |
|
if (vma->vm_pgoff >= mmio_pgoff) { |
|
if (info->var.accel_flags) { |
|
mutex_unlock(&info->mm_lock); |
|
return -EINVAL; |
|
} |
|
|
|
vma->vm_pgoff -= mmio_pgoff; |
|
start = info->fix.mmio_start; |
|
len = info->fix.mmio_len; |
|
} |
|
mutex_unlock(&info->mm_lock); |
|
|
|
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
|
fb_pgprotect(file, vma, start); |
|
|
|
return vm_iomap_memory(vma, start, len); |
|
} |
|
|
|
static int |
|
fb_open(struct inode *inode, struct file *file) |
|
__acquires(&info->lock) |
|
__releases(&info->lock) |
|
{ |
|
int fbidx = iminor(inode); |
|
struct fb_info *info; |
|
int res = 0; |
|
|
|
info = get_fb_info(fbidx); |
|
if (!info) { |
|
request_module("fb%d", fbidx); |
|
info = get_fb_info(fbidx); |
|
if (!info) |
|
return -ENODEV; |
|
} |
|
if (IS_ERR(info)) |
|
return PTR_ERR(info); |
|
|
|
lock_fb_info(info); |
|
if (!try_module_get(info->fbops->owner)) { |
|
res = -ENODEV; |
|
goto out; |
|
} |
|
file->private_data = info; |
|
if (info->fbops->fb_open) { |
|
res = info->fbops->fb_open(info,1); |
|
if (res) |
|
module_put(info->fbops->owner); |
|
} |
|
#ifdef CONFIG_FB_DEFERRED_IO |
|
if (info->fbdefio) |
|
fb_deferred_io_open(info, inode, file); |
|
#endif |
|
out: |
|
unlock_fb_info(info); |
|
if (res) |
|
put_fb_info(info); |
|
return res; |
|
} |
|
|
|
static int |
|
fb_release(struct inode *inode, struct file *file) |
|
__acquires(&info->lock) |
|
__releases(&info->lock) |
|
{ |
|
struct fb_info * const info = file->private_data; |
|
|
|
lock_fb_info(info); |
|
if (info->fbops->fb_release) |
|
info->fbops->fb_release(info,1); |
|
module_put(info->fbops->owner); |
|
unlock_fb_info(info); |
|
put_fb_info(info); |
|
return 0; |
|
} |
|
|
|
#if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) |
|
unsigned long get_fb_unmapped_area(struct file *filp, |
|
unsigned long addr, unsigned long len, |
|
unsigned long pgoff, unsigned long flags) |
|
{ |
|
struct fb_info * const info = filp->private_data; |
|
unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); |
|
|
|
if (pgoff > fb_size || len > fb_size - pgoff) |
|
return -EINVAL; |
|
|
|
return (unsigned long)info->screen_base + pgoff; |
|
} |
|
#endif |
|
|
|
static const struct file_operations fb_fops = { |
|
.owner = THIS_MODULE, |
|
.read = fb_read, |
|
.write = fb_write, |
|
.unlocked_ioctl = fb_ioctl, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = fb_compat_ioctl, |
|
#endif |
|
.mmap = fb_mmap, |
|
.open = fb_open, |
|
.release = fb_release, |
|
#if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ |
|
(defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ |
|
!defined(CONFIG_MMU)) |
|
.get_unmapped_area = get_fb_unmapped_area, |
|
#endif |
|
#ifdef CONFIG_FB_DEFERRED_IO |
|
.fsync = fb_deferred_io_fsync, |
|
#endif |
|
.llseek = default_llseek, |
|
}; |
|
|
|
struct class *fb_class; |
|
EXPORT_SYMBOL(fb_class); |
|
|
|
static int fb_check_foreignness(struct fb_info *fi) |
|
{ |
|
const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; |
|
|
|
fi->flags &= ~FBINFO_FOREIGN_ENDIAN; |
|
|
|
#ifdef __BIG_ENDIAN |
|
fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; |
|
#else |
|
fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; |
|
#endif /* __BIG_ENDIAN */ |
|
|
|
if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { |
|
pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " |
|
"support this framebuffer\n", fi->fix.id); |
|
return -ENOSYS; |
|
} else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { |
|
pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " |
|
"support this framebuffer\n", fi->fix.id); |
|
return -ENOSYS; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static bool apertures_overlap(struct aperture *gen, struct aperture *hw) |
|
{ |
|
/* is the generic aperture base the same as the HW one */ |
|
if (gen->base == hw->base) |
|
return true; |
|
/* is the generic aperture base inside the hw base->hw base+size */ |
|
if (gen->base > hw->base && gen->base < hw->base + hw->size) |
|
return true; |
|
return false; |
|
} |
|
|
|
static bool fb_do_apertures_overlap(struct apertures_struct *gena, |
|
struct apertures_struct *hwa) |
|
{ |
|
int i, j; |
|
if (!hwa || !gena) |
|
return false; |
|
|
|
for (i = 0; i < hwa->count; ++i) { |
|
struct aperture *h = &hwa->ranges[i]; |
|
for (j = 0; j < gena->count; ++j) { |
|
struct aperture *g = &gena->ranges[j]; |
|
printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n", |
|
(unsigned long long)g->base, |
|
(unsigned long long)g->size, |
|
(unsigned long long)h->base, |
|
(unsigned long long)h->size); |
|
if (apertures_overlap(g, h)) |
|
return true; |
|
} |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static void do_unregister_framebuffer(struct fb_info *fb_info); |
|
|
|
#define VGA_FB_PHYS 0xA0000 |
|
static void do_remove_conflicting_framebuffers(struct apertures_struct *a, |
|
const char *name, bool primary) |
|
{ |
|
int i; |
|
|
|
/* check all firmware fbs and kick off if the base addr overlaps */ |
|
for_each_registered_fb(i) { |
|
struct apertures_struct *gen_aper; |
|
|
|
if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE)) |
|
continue; |
|
|
|
gen_aper = registered_fb[i]->apertures; |
|
if (fb_do_apertures_overlap(gen_aper, a) || |
|
(primary && gen_aper && gen_aper->count && |
|
gen_aper->ranges[0].base == VGA_FB_PHYS)) { |
|
|
|
printk(KERN_INFO "fb%d: switching to %s from %s\n", |
|
i, name, registered_fb[i]->fix.id); |
|
do_unregister_framebuffer(registered_fb[i]); |
|
} |
|
} |
|
} |
|
|
|
static bool lockless_register_fb; |
|
module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400); |
|
MODULE_PARM_DESC(lockless_register_fb, |
|
"Lockless framebuffer registration for debugging [default=off]"); |
|
|
|
static int do_register_framebuffer(struct fb_info *fb_info) |
|
{ |
|
int i, ret; |
|
struct fb_videomode mode; |
|
|
|
if (fb_check_foreignness(fb_info)) |
|
return -ENOSYS; |
|
|
|
do_remove_conflicting_framebuffers(fb_info->apertures, |
|
fb_info->fix.id, |
|
fb_is_primary_device(fb_info)); |
|
|
|
if (num_registered_fb == FB_MAX) |
|
return -ENXIO; |
|
|
|
num_registered_fb++; |
|
for (i = 0 ; i < FB_MAX; i++) |
|
if (!registered_fb[i]) |
|
break; |
|
fb_info->node = i; |
|
refcount_set(&fb_info->count, 1); |
|
mutex_init(&fb_info->lock); |
|
mutex_init(&fb_info->mm_lock); |
|
|
|
fb_info->dev = device_create(fb_class, fb_info->device, |
|
MKDEV(FB_MAJOR, i), NULL, "fb%d", i); |
|
if (IS_ERR(fb_info->dev)) { |
|
/* Not fatal */ |
|
printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); |
|
fb_info->dev = NULL; |
|
} else |
|
fb_init_device(fb_info); |
|
|
|
if (fb_info->pixmap.addr == NULL) { |
|
fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); |
|
if (fb_info->pixmap.addr) { |
|
fb_info->pixmap.size = FBPIXMAPSIZE; |
|
fb_info->pixmap.buf_align = 1; |
|
fb_info->pixmap.scan_align = 1; |
|
fb_info->pixmap.access_align = 32; |
|
fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; |
|
} |
|
} |
|
fb_info->pixmap.offset = 0; |
|
|
|
if (!fb_info->pixmap.blit_x) |
|
fb_info->pixmap.blit_x = ~(u32)0; |
|
|
|
if (!fb_info->pixmap.blit_y) |
|
fb_info->pixmap.blit_y = ~(u32)0; |
|
|
|
if (!fb_info->modelist.prev || !fb_info->modelist.next) |
|
INIT_LIST_HEAD(&fb_info->modelist); |
|
|
|
if (fb_info->skip_vt_switch) |
|
pm_vt_switch_required(fb_info->dev, false); |
|
else |
|
pm_vt_switch_required(fb_info->dev, true); |
|
|
|
fb_var_to_videomode(&mode, &fb_info->var); |
|
fb_add_videomode(&mode, &fb_info->modelist); |
|
registered_fb[i] = fb_info; |
|
|
|
#ifdef CONFIG_GUMSTIX_AM200EPD |
|
{ |
|
struct fb_event event; |
|
event.info = fb_info; |
|
fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); |
|
} |
|
#endif |
|
|
|
if (!lockless_register_fb) |
|
console_lock(); |
|
else |
|
atomic_inc(&ignore_console_lock_warning); |
|
lock_fb_info(fb_info); |
|
ret = fbcon_fb_registered(fb_info); |
|
unlock_fb_info(fb_info); |
|
|
|
if (!lockless_register_fb) |
|
console_unlock(); |
|
else |
|
atomic_dec(&ignore_console_lock_warning); |
|
return ret; |
|
} |
|
|
|
static void unbind_console(struct fb_info *fb_info) |
|
{ |
|
int i = fb_info->node; |
|
|
|
if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) |
|
return; |
|
|
|
console_lock(); |
|
lock_fb_info(fb_info); |
|
fbcon_fb_unbind(fb_info); |
|
unlock_fb_info(fb_info); |
|
console_unlock(); |
|
} |
|
|
|
static void unlink_framebuffer(struct fb_info *fb_info) |
|
{ |
|
int i; |
|
|
|
i = fb_info->node; |
|
if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) |
|
return; |
|
|
|
if (!fb_info->dev) |
|
return; |
|
|
|
device_destroy(fb_class, MKDEV(FB_MAJOR, i)); |
|
|
|
pm_vt_switch_unregister(fb_info->dev); |
|
|
|
unbind_console(fb_info); |
|
|
|
fb_info->dev = NULL; |
|
} |
|
|
|
static void do_unregister_framebuffer(struct fb_info *fb_info) |
|
{ |
|
unlink_framebuffer(fb_info); |
|
if (fb_info->pixmap.addr && |
|
(fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) |
|
kfree(fb_info->pixmap.addr); |
|
fb_destroy_modelist(&fb_info->modelist); |
|
registered_fb[fb_info->node] = NULL; |
|
num_registered_fb--; |
|
fb_cleanup_device(fb_info); |
|
#ifdef CONFIG_GUMSTIX_AM200EPD |
|
{ |
|
struct fb_event event; |
|
event.info = fb_info; |
|
fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); |
|
} |
|
#endif |
|
console_lock(); |
|
fbcon_fb_unregistered(fb_info); |
|
console_unlock(); |
|
|
|
/* this may free fb info */ |
|
put_fb_info(fb_info); |
|
} |
|
|
|
/** |
|
* remove_conflicting_framebuffers - remove firmware-configured framebuffers |
|
* @a: memory range, users of which are to be removed |
|
* @name: requesting driver name |
|
* @primary: also kick vga16fb if present |
|
* |
|
* This function removes framebuffer devices (initialized by firmware/bootloader) |
|
* which use memory range described by @a. If @a is NULL all such devices are |
|
* removed. |
|
*/ |
|
int remove_conflicting_framebuffers(struct apertures_struct *a, |
|
const char *name, bool primary) |
|
{ |
|
bool do_free = false; |
|
|
|
if (!a) { |
|
a = alloc_apertures(1); |
|
if (!a) |
|
return -ENOMEM; |
|
|
|
a->ranges[0].base = 0; |
|
a->ranges[0].size = ~0; |
|
do_free = true; |
|
} |
|
|
|
mutex_lock(®istration_lock); |
|
do_remove_conflicting_framebuffers(a, name, primary); |
|
mutex_unlock(®istration_lock); |
|
|
|
if (do_free) |
|
kfree(a); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(remove_conflicting_framebuffers); |
|
|
|
/** |
|
* remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices |
|
* @pdev: PCI device |
|
* @name: requesting driver name |
|
* |
|
* This function removes framebuffer devices (eg. initialized by firmware) |
|
* using memory range configured for any of @pdev's memory bars. |
|
* |
|
* The function assumes that PCI device with shadowed ROM drives a primary |
|
* display and so kicks out vga16fb. |
|
*/ |
|
int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, const char *name) |
|
{ |
|
struct apertures_struct *ap; |
|
bool primary = false; |
|
int err, idx, bar; |
|
|
|
for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) { |
|
if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) |
|
continue; |
|
idx++; |
|
} |
|
|
|
ap = alloc_apertures(idx); |
|
if (!ap) |
|
return -ENOMEM; |
|
|
|
for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) { |
|
if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) |
|
continue; |
|
ap->ranges[idx].base = pci_resource_start(pdev, bar); |
|
ap->ranges[idx].size = pci_resource_len(pdev, bar); |
|
pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar, |
|
(unsigned long)pci_resource_start(pdev, bar), |
|
(unsigned long)pci_resource_end(pdev, bar)); |
|
idx++; |
|
} |
|
|
|
#ifdef CONFIG_X86 |
|
primary = pdev->resource[PCI_ROM_RESOURCE].flags & |
|
IORESOURCE_ROM_SHADOW; |
|
#endif |
|
err = remove_conflicting_framebuffers(ap, name, primary); |
|
kfree(ap); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(remove_conflicting_pci_framebuffers); |
|
|
|
/** |
|
* register_framebuffer - registers a frame buffer device |
|
* @fb_info: frame buffer info structure |
|
* |
|
* Registers a frame buffer device @fb_info. |
|
* |
|
* Returns negative errno on error, or zero for success. |
|
* |
|
*/ |
|
int |
|
register_framebuffer(struct fb_info *fb_info) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(®istration_lock); |
|
ret = do_register_framebuffer(fb_info); |
|
mutex_unlock(®istration_lock); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(register_framebuffer); |
|
|
|
/** |
|
* unregister_framebuffer - releases a frame buffer device |
|
* @fb_info: frame buffer info structure |
|
* |
|
* Unregisters a frame buffer device @fb_info. |
|
* |
|
* Returns negative errno on error, or zero for success. |
|
* |
|
* This function will also notify the framebuffer console |
|
* to release the driver. |
|
* |
|
* This is meant to be called within a driver's module_exit() |
|
* function. If this is called outside module_exit(), ensure |
|
* that the driver implements fb_open() and fb_release() to |
|
* check that no processes are using the device. |
|
*/ |
|
void |
|
unregister_framebuffer(struct fb_info *fb_info) |
|
{ |
|
mutex_lock(®istration_lock); |
|
do_unregister_framebuffer(fb_info); |
|
mutex_unlock(®istration_lock); |
|
} |
|
EXPORT_SYMBOL(unregister_framebuffer); |
|
|
|
/** |
|
* fb_set_suspend - low level driver signals suspend |
|
* @info: framebuffer affected |
|
* @state: 0 = resuming, !=0 = suspending |
|
* |
|
* This is meant to be used by low level drivers to |
|
* signal suspend/resume to the core & clients. |
|
* It must be called with the console semaphore held |
|
*/ |
|
void fb_set_suspend(struct fb_info *info, int state) |
|
{ |
|
WARN_CONSOLE_UNLOCKED(); |
|
|
|
if (state) { |
|
fbcon_suspended(info); |
|
info->state = FBINFO_STATE_SUSPENDED; |
|
} else { |
|
info->state = FBINFO_STATE_RUNNING; |
|
fbcon_resumed(info); |
|
} |
|
} |
|
EXPORT_SYMBOL(fb_set_suspend); |
|
|
|
/** |
|
* fbmem_init - init frame buffer subsystem |
|
* |
|
* Initialize the frame buffer subsystem. |
|
* |
|
* NOTE: This function is _only_ to be called by drivers/char/mem.c. |
|
* |
|
*/ |
|
|
|
static int __init |
|
fbmem_init(void) |
|
{ |
|
int ret; |
|
|
|
if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) |
|
return -ENOMEM; |
|
|
|
ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); |
|
if (ret) { |
|
printk("unable to get major %d for fb devs\n", FB_MAJOR); |
|
goto err_chrdev; |
|
} |
|
|
|
fb_class = class_create(THIS_MODULE, "graphics"); |
|
if (IS_ERR(fb_class)) { |
|
ret = PTR_ERR(fb_class); |
|
pr_warn("Unable to create fb class; errno = %d\n", ret); |
|
fb_class = NULL; |
|
goto err_class; |
|
} |
|
|
|
fb_console_init(); |
|
|
|
return 0; |
|
|
|
err_class: |
|
unregister_chrdev(FB_MAJOR, "fb"); |
|
err_chrdev: |
|
remove_proc_entry("fb", NULL); |
|
return ret; |
|
} |
|
|
|
#ifdef MODULE |
|
module_init(fbmem_init); |
|
static void __exit |
|
fbmem_exit(void) |
|
{ |
|
fb_console_exit(); |
|
|
|
remove_proc_entry("fb", NULL); |
|
class_destroy(fb_class); |
|
unregister_chrdev(FB_MAJOR, "fb"); |
|
} |
|
|
|
module_exit(fbmem_exit); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION("Framebuffer base"); |
|
#else |
|
subsys_initcall(fbmem_init); |
|
#endif |
|
|
|
int fb_new_modelist(struct fb_info *info) |
|
{ |
|
struct fb_var_screeninfo var = info->var; |
|
struct list_head *pos, *n; |
|
struct fb_modelist *modelist; |
|
struct fb_videomode *m, mode; |
|
int err; |
|
|
|
list_for_each_safe(pos, n, &info->modelist) { |
|
modelist = list_entry(pos, struct fb_modelist, list); |
|
m = &modelist->mode; |
|
fb_videomode_to_var(&var, m); |
|
var.activate = FB_ACTIVATE_TEST; |
|
err = fb_set_var(info, &var); |
|
fb_var_to_videomode(&mode, &var); |
|
if (err || !fb_mode_is_equal(m, &mode)) { |
|
list_del(pos); |
|
kfree(pos); |
|
} |
|
} |
|
|
|
if (list_empty(&info->modelist)) |
|
return 1; |
|
|
|
fbcon_new_modelist(info); |
|
|
|
return 0; |
|
} |
|
|
|
MODULE_LICENSE("GPL");
|
|
|