diff options
Diffstat (limited to 'drivers/video/fbdev/core/fbmem.c')
| -rw-r--r-- | drivers/video/fbdev/core/fbmem.c | 1995 |
1 files changed, 1995 insertions, 0 deletions
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c new file mode 100644 index 000000000..1704deaf4 --- /dev/null +++ b/drivers/video/fbdev/core/fbmem.c @@ -0,0 +1,1995 @@ +/* + * 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 <linux/fbcon.h> +#include <linux/mem_encrypt.h> +#include <linux/pci.h> + +#include <asm/fb.h> + + + /* + * Frame buffer device initialization and setup routines + */ + +#define FBPIXMAPSIZE (1024 * 8) + +static DEFINE_MUTEX(registration_lock); + +struct fb_info *registered_fb[FB_MAX] __read_mostly; +EXPORT_SYMBOL(registered_fb); + +int num_registered_fb __read_mostly; +EXPORT_SYMBOL(num_registered_fb); + +bool fb_center_logo __read_mostly; + +int fb_logo_count __read_mostly = -1; + +static struct fb_info *get_fb_info(unsigned int idx) +{ + struct fb_info *fb_info; + + if (idx >= FB_MAX) + return ERR_PTR(-ENODEV); + + mutex_lock(®istration_lock); + fb_info = registered_fb[idx]; + if (fb_info) + atomic_inc(&fb_info->count); + mutex_unlock(®istration_lock); + + return fb_info; +} + +static void put_fb_info(struct fb_info *fb_info) +{ + if (!atomic_dec_and_test(&fb_info->count)) + return; + if (fb_info->fbops->fb_destroy) + fb_info->fbops->fb_destroy(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; +} +EXPORT_SYMBOL(fb_get_buffer_offset); + +#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 && j < logo->width; 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 for two pixels (upper and lower nibble). + * To be consistent with fb_imageblit() usage, we therefore separate the two + * nibbles into separate bytes. The "depth" flag will be set to 4. + * + * Case 3 - linux_logo_mono: + * This is similar with Case 2. Each byte contains information for 8 pixels. + * We isolate each bit and expand each into a byte. The "depth" flag will + * be set to 1. + */ +static struct logo_data { + int depth; + int needs_directpalette; + int needs_truepalette; + int needs_cmapreset; + const struct linux_logo *logo; +} fb_logo __read_mostly; + +static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) +{ + u32 size = width * height, i; + + out += size - 1; + + for (i = size; i--; ) + *out-- = *in++; +} + +static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) +{ + int i, j, h = height - 1; + + for (i = 0; i < height; i++) + for (j = 0; j < width; j++) + out[height * j + h - i] = *in++; +} + +static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) +{ + int i, j, w = width - 1; + + for (i = 0; i < height; i++) + for (j = 0; j < width; j++) + out[height * (w - j) + i] = *in++; +} + +static void fb_rotate_logo(struct fb_info *info, u8 *dst, + struct fb_image *image, int rotate) +{ + u32 tmp; + + if (rotate == FB_ROTATE_UD) { + fb_rotate_logo_ud(image->data, dst, image->width, + image->height); + image->dx = info->var.xres - image->width - image->dx; + image->dy = info->var.yres - image->height - image->dy; + } else if (rotate == FB_ROTATE_CW) { + fb_rotate_logo_cw(image->data, dst, image->width, + image->height); + tmp = image->width; + image->width = image->height; + image->height = tmp; + tmp = image->dy; + image->dy = image->dx; + image->dx = info->var.xres - image->width - tmp; + } else if (rotate == FB_ROTATE_CCW) { + fb_rotate_logo_ccw(image->data, dst, image->width, + image->height); + tmp = image->width; + image->width = image->height; + image->height = tmp; + tmp = image->dx; + image->dx = image->dy; + image->dy = info->var.yres - image->height - tmp; + } + + image->data = dst; +} + +static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, + int rotate, unsigned int num) +{ + unsigned int x; + + if (image->width > info->var.xres || image->height > info->var.yres) + return; + + if (rotate == FB_ROTATE_UR) { + for (x = 0; + x < num && image->dx + image->width <= info->var.xres; + x++) { + info->fbops->fb_imageblit(info, image); + image->dx += image->width + 8; + } + } else if (rotate == FB_ROTATE_UD) { + u32 dx = image->dx; + + for (x = 0; x < num && image->dx <= dx; x++) { + info->fbops->fb_imageblit(info, image); + image->dx -= image->width + 8; + } + } else if (rotate == FB_ROTATE_CW) { + for (x = 0; + x < num && image->dy + image->height <= info->var.yres; + x++) { + info->fbops->fb_imageblit(info, image); + image->dy += image->height + 8; + } + } else if (rotate == FB_ROTATE_CCW) { + u32 dy = image->dy; + + for (x = 0; x < num && image->dy <= dy; x++) { + info->fbops->fb_imageblit(info, image); + image->dy -= image->height + 8; + } + } +} + +static int fb_show_logo_line(struct fb_info *info, int rotate, + const struct linux_logo *logo, int y, + unsigned int n) +{ + u32 *palette = NULL, *saved_pseudo_palette = NULL; + unsigned char *logo_new = NULL, *logo_rotate = NULL; + struct fb_image image; + + /* Return if the frame buffer is not mapped or suspended */ + if (logo == NULL || info->state != FBINFO_STATE_RUNNING || + info->fbops->owner) + return 0; + + image.depth = 8; + image.data = logo->data; + + if (fb_logo.needs_cmapreset) + fb_set_logocmap(info, logo); + + if (fb_logo.needs_truepalette || + fb_logo.needs_directpalette) { + palette = kmalloc(256 * 4, GFP_KERNEL); + if (palette == NULL) + return 0; + + if (fb_logo.needs_truepalette) + fb_set_logo_truepalette(info, logo, palette); + else + fb_set_logo_directpalette(info, logo, palette); + + saved_pseudo_palette = info->pseudo_palette; + info->pseudo_palette = palette; + } + + if (fb_logo.depth <= 4) { + logo_new = kmalloc_array(logo->width, logo->height, + GFP_KERNEL); + if (logo_new == NULL) { + kfree(palette); + if (saved_pseudo_palette) + info->pseudo_palette = saved_pseudo_palette; + return 0; + } + image.data = logo_new; + fb_set_logo(info, logo, logo_new, fb_logo.depth); + } + + if (fb_center_logo) { + int xres = info->var.xres; + int yres = info->var.yres; + + if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) { + xres = info->var.yres; + yres = info->var.xres; + } + + while (n && (n * (logo->width + 8) - 8 > xres)) + --n; + image.dx = (xres - (n * (logo->width + 8) - 8)) / 2; + image.dy = y ?: (yres - logo->height) / 2; + } else { + image.dx = 0; + image.dy = y; + } + + image.width = logo->width; + image.height = logo->height; + + if (rotate) { + logo_rotate = kmalloc_array(logo->width, logo->height, + GFP_KERNEL); + if (logo_rotate) + fb_rotate_logo(info, logo_rotate, &image, rotate); + } + + fb_do_show_logo(info, &image, rotate, n); + + kfree(palette); + if (saved_pseudo_palette != NULL) + info->pseudo_palette = saved_pseudo_palette; + kfree(logo_new); + kfree(logo_rotate); + return image.dy + logo->height; +} + + +#ifdef CONFIG_FB_LOGO_EXTRA + +#define FB_LOGO_EX_NUM_MAX 10 +static struct logo_data_extra { + const struct linux_logo *logo; + unsigned int n; +} fb_logo_ex[FB_LOGO_EX_NUM_MAX]; +static unsigned int fb_logo_ex_num; + +void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) +{ + if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) + return; + + fb_logo_ex[fb_logo_ex_num].logo = logo; + fb_logo_ex[fb_logo_ex_num].n = n; + fb_logo_ex_num++; +} + +static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, + unsigned int yres) +{ + unsigned int i; + + /* FIXME: logo_ex supports only truecolor fb. */ + 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 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; + + /* verify that virtual resolution >= physical resolution */ + if (var->xres_virtual < var->xres || + var->yres_virtual < var->yres) { + pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n", + info->fix.id, + var->xres_virtual, var->yres_virtual, + var->xres, var->yres); + return -EINVAL; + } + + 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 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; + 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; + /* only for kernel-internal use */ + var.activate &= ~FB_ACTIVATE_KD_TEXT; + console_lock(); + lock_fb_info(info); + ret = fbcon_modechange_possible(info, &var); + if (!ret) + 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; + 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_cmap_user __user *cmap; + struct fb_cmap32 __user *cmap32; + __u32 data; + int err; + + cmap = compat_alloc_user_space(sizeof(*cmap)); + cmap32 = compat_ptr(arg); + + if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32))) + return -EFAULT; + + if (get_user(data, &cmap32->red) || + put_user(compat_ptr(data), &cmap->red) || + get_user(data, &cmap32->green) || + put_user(compat_ptr(data), &cmap->green) || + get_user(data, &cmap32->blue) || + put_user(compat_ptr(data), &cmap->blue) || + get_user(data, &cmap32->transp) || + put_user(compat_ptr(data), &cmap->transp)) + return -EFAULT; + + err = do_fb_ioctl(info, cmd, (unsigned long) cmap); + + if (!err) { + if (copy_in_user(&cmap32->start, + &cmap->start, + 2 * sizeof(__u32))) + err = -EFAULT; + } + return err; +} + +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: + 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); + /* + * The framebuffer needs to be accessed decrypted, be sure + * SME protection is removed + */ + vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); + 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; + atomic_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"); |