Android下的摄像头驱动开发

这几天拿到一个MINI210开发板,于是尝试着把ov7670移植到开发板上.仔细的观察了一下友善给的驱动发现友善提供了ov9650的驱动,因为ov7670和ov9650的驱动比较类似.于是想在ov9650的基础上改动一下. 但是进入/opt/FriendlyARM/mini210/android/linux-2.6.35.7-android/drivers/media/video目录没有发现跟ov9650相关的源文件.看了一下Makefile 文件才知道友善竟然没有提供ov9650的源码(鄙视一下友善).

那只好自己动手了:

1.在”/opt/FriendlyARM/mini210/android/linux-2.6.35.7-android/drivers/media/video”目录下增加两个文件”fpov7670.c”和”fpov7670.h”.

2.在”/opt/FriendlyARM/mini210/android/linux-2.6.35.7-android/drivers/media/video”目录下找到”Makefile”这个文件.增加一行

“obj-$(CONFIG_VIDEO_FPOV7670)     += fpov7670.o”.

3.在”/opt/FriendlyARM/mini210/android/linux-2.6.35.7-android/drivers/media/video”目录下找到”Kconfig”

增加下面5行

config VIDEO_FPOV7670
 tristate "FPOV7670 Camera Sensor"
 depends on I2C && VIDEO_V4L2
 ---help---
 This driver supports FPOV7670 SoC camera module

4.最重要的是修改代码了.参照”s5k4ba.c”和”s5k4ba.h” 把”fpov7670.c”和”fpov7670.h”修改了.主要吧IIC配置修改即可.然后找到/opt/FriendlyARM/mini210/android/linux-2.6.35.7-android/arch/arm/mach-s5pv210/mach-mini210.c,加入fpov7670的配置.

#ifdef CONFIG_VIDEO_FPOV7670

static int ov7670_power_en(int onoff)
 {
 printk("ov7670_power_en: power %s\n", onoff ? "ON" : "Off");
 return 0;
 }

static struct fpov7670_platform_data ov7670_plat = {
 .default_width = 640,
 .default_height = 480,
 .pixelformat = V4L2_PIX_FMT_YUYV,
 .freq = 40000000,
 .is_mipi = 0,
 };
 static struct i2c_board_info  ov7670_i2c_info = {
 I2C_BOARD_INFO("FPOV7670", (0x42>>1)),
 .platform_data = &ov7670_plat,
 };

static struct s3c_platform_camera ov7670 = {
 .id        = CAMERA_PAR_A,
 .type        = CAM_TYPE_ITU,
 .fmt        = ITU_601_YCBCR422_8BIT,
 .order422    = CAM_ORDER422_8BIT_CBYCRY,
 .i2c_busnum    = 0,
 .info        = &ov7670_i2c_info,
 .pixelformat    = V4L2_PIX_FMT_YUYV,
 .srclk_name    = "mout_mpll",
 /* .srclk_name    = "xusbxti", */
 .clk_name    = "sclk_cam1",
 .clk_rate    = 40000000,
 .line_length    = 640,
 .width        = 640,
 .height        = 480,
 .window        = {
 .left    = 0,
 .top    = 0,
 .width    = 640,
 .height    = 480,
 },
 /* Polarity */
 .inv_pclk    = 1,
 .inv_vsync    = 1,
 .inv_href    = 0,
 .inv_hsync    = 0,

.initialized    = 0,
 .cam_power    = ov7670_power_en,
 };

#endif

在驱动列表中加入ov7670驱动

/* Interface setting */
 static struct s3c_platform_fimc fimc_plat_lsi = {
 .srclk_name    = "mout_mpll",
 .clk_name    = "sclk_fimc",
 .lclk_name    = "sclk_fimc_lclk",
 .clk_rate    = 166750000,
 #if defined(CONFIG_VIDEO_S5K4EA)
 .default_cam    = CAMERA_CSI_C,
 #else
 #ifdef CAM_ITU_CH_A
 .default_cam    = CAMERA_PAR_A,
 #else
 .default_cam    = CAMERA_PAR_B,
 #endif
 #endif
 .camera        = {
 #ifdef CONFIG_VIDEO_S5K4ECGX
 &s5k4ecgx,
 #endif
 #ifdef CONFIG_VIDEO_S5KA3DFX
 &s5ka3dfx,
 #endif
 #ifdef CONFIG_VIDEO_S5K4BA
 &s5k4ba,
 #endif
 #ifdef CONFIG_VIDEO_S5K4EA
 &s5k4ea,
 #endif
 #ifdef CONFIG_VIDEO_OV9650
 &ov9650,
 #endif
 #ifdef CONFIG_VIDEO_FPOV7670//新加入
 &ov7670,//新加入
 #endif //新加入
 },
 .hw_ver        = 0x43,
 };

5.在”/opt/FriendlyARM/mini210/android/linux-2.6.35.7-android”目录下 输入”make menuconfig” 回车,选择FPOV7670之后,make之.成功后把zImage烧入开发板.打开摄像头测试,出图了.

注意,因为我们FPOV7670的驱动是用在指纹采集上并不需要”自动曝光””调节白平衡”等功能.如果是用在拍照上,就需要加入上述功能.