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9d200153 SM |
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); |