LCD驱动 15 -2

1.分配一个fb_info结构体： framebuffer_alloc

2.设置

3.注册

4.硬件相关操

struct fb_fix_screeninfo {
 char id[16];   /* identification string eg "TT Builtin" */
 unsigned long smem_start; /* Start of frame buffer mem */
     /* (physical address) */
 __u32 smem_len;   /* Length of frame buffer mem */
 __u32 type;   /* see FB_TYPE_*  */
 __u32 visual;   /* see FB_VISUAL_*  */ 
 __u32 line_length;  /* length of a line in bytes    */
};

struct fb_var_screeninfo {

__u32 xres;   /* visible resolution  */

__u32 yres;

__u32 xres_virtual;  /* virtual resolution  */

__u32 yres_virtual;

__u32 bits_per_pixel;  /* guess what   */

struct fb_bitfield red;  /* bitfield in fb mem if true color, */

struct fb_bitfield green; /* else only length is significant */

struct fb_bitfield blue;

__u32 activate;   /* see FB_ACTIVATE_*  */

};

 1 static int lcd_init(void)
 2 {
 3     /* 1. 分配一个fb_info */
 4     s3c_lcd = framebuffer_alloc(0, NULL);
 5
 6     /* 2. 设置 */
 7     /* 2.1 设置固定的参数 */
 8     strcpy(s3c_lcd->fix.id, "mylcd");
 9     s3c_lcd->fix.smem_len = 480 * 272 * 16 / 8;
10     s3c_lcd->fix.type = FB_TYPE_PACKED_PIXELS;
11     s3c_lcd->fix.visual = FB_VISUAL_TRUECOLOR;  /*TFT*/
12     s3c_lcd->fix.line_length = 480 * 2;
13
14     /* 2.2 设置可变的参数 */
15     s3c_lcd->var.xres           = 480;
16     s3c_lcd->var.yres           = 272;
17     s3c_lcd->var.xres_virtual   = 480;
18     s3c_lcd->var.yres_virtual   = 272;
19     s3c_lcd->var.bits_per_pixel = 16;
20
21     /* RGB:565 */
22     s3c_lcd->var.red.offset     = 11;
23     s3c_lcd->var.red.length     = 5;
24
25     s3c_lcd->var.green.offset   = 5;
26     s3c_lcd->var.green.length   = 6;
27
28     s3c_lcd->var.blue.offset    = 0;
29     s3c_lcd->var.blue.length    = 5;
30
31     s3c_lcd->var.activate       = FB_ACTIVATE_NOW;
32
33     /* 2.3 设置操作函数 */
34     s3c_lcd->fbops = &s3c_lcdfb_ops;
35
36     /* 2.4 其他设置 */
37     //s3c_lcd->pseudo_palette;
38     //s3c_lcd->screen_base;                //显存的虚拟地址
39     //s3c_lcd->screen_size = 480 * 272 * 16 / 8;
40     /* 3. 硬件相关的设置 */
41     /* 3.1 配置GPIO用于LCD */
42     /* 3.2 根据LCD手册设置LCD控制器，比如VCLK的频率等 */
43     /* 3.3 分配显存(framebuffer)，并把地址告诉LCD控制器 */
44
45     /* 4. 注册 */
46
47     register_framebuffer(s3c_lcd);
48
49     return 0;
50 }