linux下的lcd驱动 源码

/* * linux/drivers/video/fbmem.c * * Copyright (C) 1994 Martin Schaller * * 2001 - Documented with DocBook * - Brad Douglas <brad@neruo.com> * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */ #include <linux/module.h> #include <linux/compat.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/slab.h> #include <linux/mm.h> #include <linux/mman.h> #include <linux/vt.h> #include <linux/init.h> #include <linux/linux_logo.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/console.h> #include <linux/kmod.h> #include <linux/err.h> #include <linux/device.h> #include <linux/efi.h> #include <linux/fb.h> #include <asm/fb.h> /* * Frame buffer device initialization and setup routines */ #define FBPIXMAPSIZE (1024 * 8) struct fb_info *registered_fb[FB_MAX] __read_mostly; int num_registered_fb __read_mostly; int lock_fb_info(struct fb_info *info) { mutex_lock(&info->lock); if (!info->fbops) { mutex_unlock(&info->lock); return 0; } return 1; } EXPORT_SYMBOL(lock_fb_info); /* * Helpers */ int fb_get_color_depth(struct fb_var_screeninfo *var, struct fb_fix_screeninfo *fix) { int depth = 0; if (fix->visual == FB_VISUAL_MONO01 || fix->visual == FB_VISUAL_MONO10) depth = 1; else { if (var->green.length == var->blue.length && var->green.length == var->red.length && var->green.offset == var->blue.offset && var->green.offset == var->red.offset) depth = var->green.length; else depth = var->green.length + var->red.length + var->blue.length; } return depth; } EXPORT_SYMBOL(fb_get_color_depth); /* * Data padding functions. */ void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) { __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); } EXPORT_SYMBOL(fb_pad_aligned_buffer); void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, u32 shift_high, u32 shift_low, u32 mod) { u8 mask = (u8) (0xfff << shift_high), tmp; int i, j; for (i = height; i--; ) { for (j = 0; j < idx; j++) { tmp = dst[j]; tmp &= mask; tmp |= *src >> shift_low; dst[j] = tmp; tmp = *src << shift_high; dst[j+1] = tmp; src++; } tmp = dst[idx]; tmp &= mask; tmp |= *src >> shift_low; dst[idx] = tmp; if (shift_high < mod) { tmp = *src << shift_high; dst[idx+1] = tmp; } src++; dst += d_pitch; } } EXPORT_SYMBOL(fb_pad_unaligned_buffer); /* * we need to lock this section since fb_cursor * may use fb_imageblit() */ char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) { u32 align = buf->buf_align - 1, offset; char *addr = buf->addr; /* If IO mapped, we need to sync before access, no sharing of * the pixmap is done */ if (buf->flags & FB_PIXMAP_IO) { if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) info->fbops->fb_sync(info); return addr; } /* See if we fit in the remaining pixmap space */ offset = buf->offset + align; offset &= ~align; if (offset + size > buf->size) { /* We do not fit. In order to be able to re-use the buffer, * we must ensure no asynchronous DMA'ing or whatever operation * is in progress, we sync for that. */ if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) info->fbops->fb_sync(info); offset = 0; } buf->offset = offset + size; addr += offset; return addr; } #ifdef CONFIG_LOGO static inline unsigned safe_shift(unsigned d, int n) { return n < 0 ? d >> -n : d << n; } static void fb_set_logocmap(struct fb_info *info, const struct linux_logo *logo) { struct fb_cmap palette_cmap; u16 palette_green[16]; u16 palette_blue[16]; u16 palette_red[16]; int i, j, n; const unsigned char *clut = logo->clut; palette_cmap.start = 0; palette_cmap.len = 16; palette_cmap.red = palette_red; palette_cmap.green = palette_green; palette_cmap.blue = palette_blue; palette_cmap.transp = NULL; for (i = 0; i < logo->clutsize; i += n) { n = logo->clutsize - i; /* palette_cmap provides space for only 16 colors at once */ if (n > 16) n = 16; palette_cmap.start = 32 + i; palette_cmap.len = n; for (j = 0; j < n; ++j) { palette_cmap.red[j] = clut[0] << 8 | clut[0]; palette_cmap.green[j] = clut[1] << 8 | clut[1]; palette_cmap.blue[j] = clut[2] << 8 | clut[2]; clut += 3; } fb_set_cmap(&palette_cmap, info); } } static void fb_set_logo_truepalette(struct fb_info *info, const struct linux_logo *logo, u32 *palette) { static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; unsigned char redmask, greenmask, bluemask; int redshift, greenshift, blueshift; int i; const unsigned char *clut = logo->clut; /* * We have to create a temporary palette since console palette is only * 16 colors long. */ /* Bug: Doesn't obey msb_right ... (who needs that?) */ redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; redshift = info->var.red.offset - (8 - info->var.red.length); greenshift = info->var.green.offset - (8 - info->var.green.length); blueshift = info->var.blue.offset - (8 - info->var.blue.length); for ( i = 0; i < logo->clutsize; i++) { palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | safe_shift((clut[1] & greenmask), greenshift) | safe_shift((clut[2] & bluemask), blueshift)); clut += 3; } } static void fb_set_logo_directpalette(struct fb_info *info, const struct linux_logo *logo, u32 *palette) { int redshift, greenshift, blueshift; int i; redshift = info->var.red.offset; greenshift = info->var.green.offset; blueshift = info->var.blue.offset; for (i = 32; i < 32 + logo->clutsize; i++) palette[i] = i << redshift | i << greenshift | i << blueshift; } static void fb_set_logo(struct fb_info *info, const struct linux_logo *logo, u8 *dst, int depth) { int i, j, k; const u8 *src = logo->data; u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; u8 fg = 1, d; switch (fb_get_color_depth(&info->var, &info->fix)) { case 1: fg = 1; break; case 2: fg = 3; break; default: fg = 7; break; } if (info->fix.visual == FB_VISUAL_MONO01 || info->fix.visual == FB_VISUAL_MONO10) fg = ~((u8) (0xfff << info->var.green.length)); switch (depth) { case 4: for (i = 0; i < logo->height; i++) for (j = 0; j < logo->width; src++) { *dst++ = *src >> 4; j++; if (j < logo->width) { *dst++ = *src & 0x0f; j++; } } break; case 1: for (i = 0; i < logo->height; i++) { for (j = 0; j < logo->width; src++) { d = *src ^ xor; for (k = 7; k >= 0; k--) { *dst++ = ((d >> k) & 1) ? fg : 0; j++; } } } break; } } /* * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on * the visual format and color depth of the framebuffer, the DAC, the * pseudo_palette, and the logo data will be adjusted accordingly. * * Case 1 - linux_logo_clut224: * Color exceeds the number of console colors (16), thus we set the hardware DAC * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. * * For visuals that require color info from the pseudo_palette, we also construct * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags * will be set. * * Case 2 - linux_logo_vga16: * The number of colors just matches the console colors, thus there is no need * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, * each byte contains color information fo