A20平台增加camera
驱动采用模块加载的方式
1) 模块加载的文件在android中配置(修改点)
\A20-T2\android\device\softwinner\wing-n71j\init.sun7i.rc
# csi module
insmod /system/vendor/modules/videobuf-core.ko
insmod /system/vendor/modules/videobuf-dma-contig.ko
insmod /system/vendor/modules/camera.ko
# insmod_modules camera
insmod /system/vendor/modules/nt99141.ko //需要修改的设备驱动
insmod /system/vendor/modules/sunxi_csi0.ko //csi驱动2) 修改android使用权限，video1 值可以变化，可能是video0 （一般不用修改）
\A20-T2\android\device\softwinner wing-n71j\ueventd.sun7i.rc
3) 修改camera.cfg配置文件，设置摄像头的属性 （一般不用修改）
板子上的地址/system/etc/camera.cfg
系统地址：device/softwinner/wing-k70/configs/camera.cfg
;——————————————————————————-
; driver device name
;——————————————————————————-
camera_device = /dev/video0
摄像头挂载的设备节点
4) 修改media_profiles.xml配置录像参数 板子上的地址/system/etc/media_profiles.xml
系统地址：device/softwinner/wing-k70/configs/media_profiles.xml （一般不用修改）
5) 参数设置完毕，剩下的需要修改sys_config.fex （需要修改）
Linux kernel 给android的配置，使用哪个摄像头。
Z:\A20-T2\lichee\tools\pack\chips\sun7i\configs\android\wing-n71j\sys_config.fex
【配置如下】
;--------------------------------------------------------------------------------
;csi gpio configuration
;csi_if: 0:hv_8bit 1:hv_16bit 2:hv_24bit 3:bt656 1ch 4:bt656 2ch 5:bt656 4ch
;csi_mode: 0:sample one csi to one buffer 1:sample two csi to one buffer
;csi_dev_qty: The quantity of devices linked to csi interface
;csi_vflip: flip in vertical direction 0:disable 1:enable
;csi_hflip: flip in horizontal direction 0:disable 1:enable
;csi_stby_mode: 0:not shut down power at standby 1:shut down power at standby
;csi_iovdd: camera module io power , pmu power supply
;csi_avdd: camera module analog power , pmu power supply
;csi_dvdd: camera module core power , pmu power supply
;pmu_ldo3: fill "axp20_pll"
;pmu_ldo4: fill "axp20_hdmi"
;fill "" when not using any pmu power supply
;csi_flash_pol: the active polority of the flash light IO 0:low active 1:high active
;--------------------------------------------------------------------------------
[camera_list_para]
camera_list_para_used = 1
ov7670 = 0
nt99141 = 1 //选择某个摄像头
gc0308 = 0
gt2005 = 0
hi704 = 0
sp0838 = 0
mt9m112 = 0
mt9m113 = 0
gc2035 = 0
ov2655 = 0
hi253 = 0
gc0307 = 0
mt9d112 = 0
ov5640 = 0
gc2015 = 0
ov2643 = 0
gc0329 = 0
gc0309 = 0
tvp5150 = 0
s5k4ec = 0
ov5650_mv9335 = 0
siv121d = 0
;--------------------------------------------------------------------------------
;csi gpio configuration
;csi_if: 0:hv_8bit 1:hv_16bit 2:hv_24bit 3:bt656 1ch 4:bt656 2ch 5:bt656 4ch
;csi_mode: 0:sample one csi to one buffer 1:sample two csi to one buffer
;csi_dev_qty: The quantity of devices linked to csi interface
;csi_vflip: flip in vertical direction 0:disable 1:enable
;csi_hflip: flip in horizontal direction 0:disable 1:enable
;csi_stby_mode: 0:not shut down power at standby 1:shut down power at standby
;csi_iovdd: camera module io power , pmu power supply
;csi_avdd: camera module analog power , pmu power supply
;csi_dvdd: camera module core power , pmu power supply
;pmu_ldo3: fill "axp20_pll"
;pmu_ldo4: fill "axp20_hdmi"
;fill "" when not using any pmu power supply
;csi_flash_pol: the active polority of the flash light IO 0:low active 1:high active
;--------------------------------------------------------------------------------
[csi0_para] // CSI0 接口使用摄像头的配置
csi_used = 1
csi_dev_qty = 2 //数量2个
csi_stby_mode = 0
csi_mname = "nt99141"
csi_twi_id = 1
csi_twi_addr = 0x54 // I2C地址
csi_if = 0
csi_vflip = 0
csi_hflip = 0
csi_iovdd = "axp20_hdmi"
csi_avdd = ""
csi_dvdd = ""
csi_vol_iovdd = 3300
csi_vol_dvdd =
csi_vol_avdd =
csi_flash_pol = 0
csi_mname_b = // 第二个摄像头的配置，若不存在，放空
csi_twi_id_b =
csi_twi_addr_b =
csi_if_b =
csi_vflip_b =
csi_hflip_b =
csi_iovdd_b =
csi_avdd_b =
csi_dvdd_b =
csi_vol_iovdd_b =
csi_vol_avdd_b =
csi_vol_dvdd_b =
csi_flash_pol_b =
// 以下为摄像头的硬件GPIO口配置，需要HW提供
csi_pck = port:PE00<3><default><default><default>
csi_ck = port:PE01<3><default><default><default>
csi_hsync = port:PE02<3><default><default><default>
csi_vsync = port:PE03<3><default><default><default>
csi_d0 = port:PE04<3><default><default><default>
csi_d1 = port:PE05<3><default><default><default>
csi_d2 = port:PE06<3><default><default><default>
csi_d3 = port:PE07<3><default><default><default>
csi_d4 = port:PE08<3><default><default><default>
csi_d5 = port:PE09<3><default><default><default>
csi_d6 = port:PE10<3><default><default><default>
csi_d7 = port:PE11<3><default><default><default>
csi_reset = port:PH14<1><default><default><0>
csi_power_en = port:PH16<1><default><default><0>
csi_stby = port:PH19<1><default><default><0>
csi_flash =
csi_af_en =
csi_reset_b = port:PH13<1><default><default><0>
csi_power_en_b = port:PH16<1><default><default><0>
csi_stby_b = port:PH18<1><default><default><0>
csi_flash_b =
csi_af_en_b =
[csi1_para] // CSI1 接口使用摄像头的配置
csi_used = 0
csi_dev_qty = 1
csi_stby_mode = 0
csi_mname = "gc0308"
csi_if = 0
csi_iovdd = "axp20_pll"
csi_avdd = ""
csi_dvdd = ""
csi_vol_iovdd = 2800
csi_vol_dvdd =
csi_vol_avdd =
csi_vflip = 0
csi_hflip = 0
csi_flash_pol = 0
csi_facing = 1
csi_twi_id = 1
csi_twi_addr = 0x42
csi_pck = port:PG00<3><default><default><default>
csi_ck = port:PG01<3><default><default><default>
csi_hsync = port:PG02<3><default><default><default>
csi_vsync = port:PG03<3><default><default><default>
csi_d0 = port:PG04<3><default><default><default>
csi_d1 = port:PG05<3><default><default><default>
csi_d2 = port:PG06<3><default><default><default>
csi_d3 = port:PG07<3><default><default><default>
csi_d4 = port:PG08<3><default><default><default>
csi_d5 = port:PG09<3><default><default><default>
csi_d6 = port:PG10<3><default><default><default>
csi_d7 = port:PG11<3><default><default><default>
csi_reset = port:PH13<1><default><default><0>
csi_power_en = port:PH16<1><default><default><0>
csi_stby = port:PH19<1><default><default><0>
6) 增加驱动 （需要修改）以上分几个步骤说明
Z:\A20-T2\lichee\linux-3.4\drivers\media\video\sunxi_csi\device
init.sun7i.rc文件中增加的驱动如下图所示，与摄像头相关的驱动有3个
camera.ko sun7i_csi0.ko 和nt99141,ko,分别对应下面目录中的驱动
lichee\linux-3.4\drivers\media\video\sunxi_csi
的目录结构如下：
camera_detector：对摄像头的检测
csi0 csi1：
COMS Sensor Interface：CSI接口通常从COMS Sensor,Video Encoder和其它视频输出设备收集数据。Camera Serial Interface，相机串行接口，MIPI接口之一。
device：摄像头设备驱动
Kconfig：config文件，用于选择配置摄像头
第一步：修改camera_detector中camera_list.c
增加添加的摄像头，例如：
#define __NT99141__
static void camera_pwr_on_nt99141(__u32 list_index, __camera_info_t *camera_info)
{
camera_gpio_set_status(camera_info->stby_pin, 1);
camera_gpio_set_status(camera_info->reset_pin, 1);
//power supply
camera_gpio_write(camera_info->stby_pin, camera_list[list_index].CSI_STBY_ON);
camera_gpio_write(camera_info->reset_pin, camera_list[list_index].CSI_RST_ON);
mdelay(1);
clk_enable(camera_info->module_clk);
mdelay(10);
camera_gpio_write(camera_info->pwr_pin, camera_list[list_index].CSI_PWR_ON);
mdelay(10);
if(camera_info->dvdd)
{
regulator_enable(camera_info->dvdd);
mdelay(10);
}
if(camera_info->avdd)
{
regulator_enable(camera_info->avdd);
mdelay(10);
}
if(camera_info->iovdd)
{
regulator_enable(camera_info->iovdd);
mdelay(10);
}
//standby off io
camera_gpio_write(camera_info->stby_pin, camera_list[list_index].CSI_STBY_OFF);
mdelay(10);
camera_gpio_write(camera_info->reset_pin, camera_list[list_index].CSI_RST_OFF);
mdelay(10);
camera_gpio_write(camera_info->reset_pin, camera_list[list_index].CSI_RST_ON);
mdelay(10);
camera_gpio_write(camera_info->reset_pin, camera_list[list_index].CSI_RST_OFF);
mdelay(10);
}
static void camera_pwr_off_nt99141(__u32 list_index, __camera_info_t *camera_info)
{
camera_gpio_write(camera_info->stby_pin, camera_list[list_index].CSI_STBY_ON);
mdelay(10);
//reset on io
camera_gpio_write(camera_info->reset_pin, camera_list[list_index].CSI_RST_ON);
mdelay(10);
//inactive mclk after power off
//power supply off
if(camera_info->iovdd) {
regulator_disable(camera_info->iovdd);
}
if(camera_info->avdd) {
regulator_disable(camera_info->avdd);
}
if(camera_info->dvdd) {
regulator_disable(camera_info->dvdd);
}
camera_gpio_write(camera_info->pwr_pin, camera_list[list_index].CSI_PWR_OFF);
mdelay(10);
//standby of io
clk_disable(camera_info->module_clk);
//set the io to hi-z
camera_gpio_set_status(camera_info->reset_pin, 0);//set the gpio to input
// camera_gpio_set_status(camera_info->stby_pin, 0);//set the gpio to input
}
static __s32 camera_detect_nt99141(__u32 list_index, struct i2c_adapter *i2c_adap)
{
int ret;
struct regval_list regs;
__u32 i2c_addr = camera_list[list_index].i2c_addr;
__u32 addr_step = camera_list[list_index].REG_ADDR_STEP;
__u32 data_step = camera_list[list_index].REG_DATA_STEP;
list_print("try to detect nt99141 ...addr_step = %d data_step = %d\n", addr_step, data_step);
return 0;
regs.reg_num[0] = 0x30;
regs.reg_num[1] = 0x21;
ret = camera_i2c_read(i2c_adap, regs.reg_num, regs.value, i2c_addr, addr_step, data_step);
if (ret < 0) {
list_print("gaoliang no read \n");
return ret;
}
list_print("gaoliang read value = 0x%d \n", regs.value[0]);
if (regs.value[0] != 0x56) {
return -ENODEV;
}
list_print("detect nt99141 success!!\n");
return 0;
}
__camera_list_t camera_list[MAX_CAMERA_LIST_ITEM]中增加nt99141
CAMERA_LIST_ITEM_INIT(nt99141, 2, 1, 0x54, 1, 0, 0, 1, 1, 0),
第二步：修改CSI驱动，目前有两路CSI，具体使用哪路在配置文件中设置
\lichee\tools\pack\chips\sun7i\configs\android\wing-n71j\sys_config.fex
一般驱动不做修改
第三步：在device文件夹中增加你所添加的驱动。例如添加nt99141
先修改Makefile增加你所添加的驱动
obj-$(CONFIG_CSI_NT99141) += nt99141.o
再增加驱动原始文件
第四步：修改Kconfig
config CSI_NT99141
tristate "OmniVision NT99141 5M sensor support"
default m
depends on I2C && VIDEO_V4L2
select CSI_DEV_SEL
---help---
This is a Video4Linux2 sensor-level driver for the OmniVision
NT99141 5M camera.剩下就是测试，调试驱动文件了。