Stepan Moskovchenko | 9d20015 | 2010-05-19 11:03:30 -0700 | [diff] [blame] | 1 | /* drivers/video/msm/logo.c |
| 2 | * |
| 3 | * Show Logo in RLE 565 format |
| 4 | * |
| 5 | * Copyright (C) 2008 Google Incorporated |
| 6 | * |
| 7 | * This software is licensed under the terms of the GNU General Public |
| 8 | * License version 2, as published by the Free Software Foundation, and |
| 9 | * may be copied, distributed, and modified under those terms. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | */ |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/fb.h> |
| 20 | #include <linux/vt_kern.h> |
| 21 | #include <linux/unistd.h> |
| 22 | #include <linux/syscalls.h> |
| 23 | |
| 24 | #include <linux/irq.h> |
| 25 | #include <asm/system.h> |
| 26 | |
| 27 | #define fb_width(fb) ((fb)->var.xres) |
| 28 | #define fb_height(fb) ((fb)->var.yres) |
| 29 | #define fb_size(fb) ((fb)->var.xres * (fb)->var.yres * 2) |
| 30 | |
| 31 | static void memset16(void *_ptr, unsigned short val, unsigned count) |
| 32 | { |
| 33 | unsigned short *ptr = _ptr; |
| 34 | count >>= 1; |
| 35 | while (count--) |
| 36 | *ptr++ = val; |
| 37 | } |
| 38 | |
| 39 | /* 565RLE image format: [count(2 bytes), rle(2 bytes)] */ |
| 40 | int load_565rle_image(char *filename) |
| 41 | { |
| 42 | struct fb_info *info; |
| 43 | int fd, err = 0; |
| 44 | unsigned count, max; |
| 45 | unsigned short *data, *bits, *ptr; |
| 46 | |
| 47 | info = registered_fb[0]; |
| 48 | if (!info) { |
| 49 | printk(KERN_WARNING "%s: Can not access framebuffer\n", |
| 50 | __func__); |
| 51 | return -ENODEV; |
| 52 | } |
| 53 | |
| 54 | fd = sys_open(filename, O_RDONLY, 0); |
| 55 | if (fd < 0) { |
| 56 | printk(KERN_WARNING "%s: Can not open %s\n", |
| 57 | __func__, filename); |
| 58 | return -ENOENT; |
| 59 | } |
| 60 | count = (unsigned)sys_lseek(fd, (off_t)0, 2); |
| 61 | if (count == 0) { |
| 62 | sys_close(fd); |
| 63 | err = -EIO; |
| 64 | goto err_logo_close_file; |
| 65 | } |
| 66 | sys_lseek(fd, (off_t)0, 0); |
| 67 | data = kmalloc(count, GFP_KERNEL); |
| 68 | if (!data) { |
| 69 | printk(KERN_WARNING "%s: Can not alloc data\n", __func__); |
| 70 | err = -ENOMEM; |
| 71 | goto err_logo_close_file; |
| 72 | } |
| 73 | if ((unsigned)sys_read(fd, (char *)data, count) != count) { |
| 74 | err = -EIO; |
| 75 | goto err_logo_free_data; |
| 76 | } |
| 77 | |
| 78 | max = fb_width(info) * fb_height(info); |
| 79 | ptr = data; |
| 80 | bits = (unsigned short *)(info->screen_base); |
| 81 | while (count > 3) { |
| 82 | unsigned n = ptr[0]; |
| 83 | if (n > max) |
| 84 | break; |
| 85 | memset16(bits, ptr[1], n << 1); |
| 86 | bits += n; |
| 87 | max -= n; |
| 88 | ptr += 2; |
| 89 | count -= 4; |
| 90 | } |
| 91 | |
| 92 | err_logo_free_data: |
| 93 | kfree(data); |
| 94 | err_logo_close_file: |
| 95 | sys_close(fd); |
| 96 | return err; |
| 97 | } |
| 98 | EXPORT_SYMBOL(load_565rle_image); |