1、首先用万用表确定好vcc 2.8v和1.8v的供电正常，有的平台2.8v是软件控制打开，有的平台是直接硬件长供的。
2、根据原理图确定好gpio的配置主要包括spi_cs,spi_sck，spi_miso，spi_mosi，还有复位脚rst和中断脚int:，使用的是哪一组SPI通讯等。
3、dts添加cdfinger 的节点，gpio的配置等，注意查看所使用的gpio是否有其他地方有复用:
vim kernel-3.18/arch/arm/boot/dts/alongk80_bsp.dts
&cdfinger {
compatible = “cdfinger,fps1098”;
reg = <0>;
interrupt-parent = <&eintc>;
interrupts = <83 IRQ_TYPE_EDGE_RISING>;
debounce = <83 0>;
vdd_ldo_enable = <0>;
vio_ldo_enable = <0>;
config_spi_pin = <1>;
spi-max-frequency = <8000000>;
pinctrl-names = “fingerprint_reset_high”,
“fingerprint_reset_low”,
“fingerprint_spi_miso”,
“fingerprint_spi_mosi”,
“fingerprint_spi_sck”,
“fingerprint_spi_cs”,
“fingerprint_irq”;
pinctrl-0 = <&fps_reset_high>;
pinctrl-1 = <&fps_reset_low>;
pinctrl-2 = <&fps_spi_miso>;
pinctrl-3 = <&fps_spi_mosi>;
pinctrl-4 = <&fps_spi_sck>;
pinctrl-5 = <&fps_spi_cs>;
pinctrl-6 = <&fps_irq>;
status = “okay”;
};
&pio {
fps_reset_high: fps_reset_high {
pins_cmd_dat {
pins = ;
slew-rate = <1>;
bias-disable;
output-high;
};
};
fps_reset_low: fps_reset_low {
pins_cmd_dat {
pins = ;
slew-rate = <1>;
bias-disable;
output-low;
};
};
fps_spi_miso:fps_spi_miso@gpio3{
pins_cmd_dat {
pins = ;
slew-rate = <0>;
bias-pull-up = <11>;
output-low;
};
};
fps_spi_mosi:fps_spi_mosi@gpio2{
pins_cmd_dat {
pins = ;
slew-rate = <1>;
bias-pull-up = <11>;
output-low;
};
};
fps_spi_sck:fps_spi_sck@gpio1{
pins_cmd_dat {
pins = ;
slew-rate = <1>;
bias-pull-up = <11>;
output-low;
};
};
fps_spi_cs:fps_spi_cs@gpio0{
pins_cmd_dat {
pins = ;
slew-rate = <1>;
bias-pull-up = <11>;
output-low;
};
};
fps_irq: fps_irq {
pins_cmd_dat {
pins = ;
slew-rate = <0>;
bias-disable;
output-low;
};
};
};
4、mt6580.dts添加pmic的配置
vim /kernel-3.18/arch/arm/boot/dts/mt6580.dts
@@ -773,6 +773,13 @@
#size-cells = <0>;
};
+
+ cdfinger:cdfinger@ {
+ compatible = “cdfinger,fps1098”;
+ finger-supply = <&mt_pmic_vgp1_ldo_reg>;
+ };
+
5、defconfig打开要编译驱动的宏配置
vim kernel-3.18/arch/arm/configs/alongk80_bsp_debug_defconfig
+# for finger
+CONFIG_MTK_FINGERPRINT_SUPPORT=y
+CONFIG_CDFINGER_FP_REE_FINGERPRINT=y
vim kernel-3.18/arch/arm/configs/alongk80_bsp_defconfig
+# for finger
+CONFIG_MTK_FINGERPRINT_SUPPORT=y
+CONFIG_CDFINGER_FP_REE_FINGERPRINT=y
6、修改Makefile和Kconfig文件:
vim /kernel-3.18/drivers/input/fingerprint/Kconfig
+config CDFINGER_FP_REE_FINGERPRINT
+ bool “Mediatek cdfinger_fp_ree Fingerprint”
+ default n
+ —help—
+ Fingerprint mtk driver enable/disable in the kernel.
+ Say Y here if you want to use mediatek fingerprint driver,
+ fingerprint driver will support fingerprint function
+
vim kernel-3.18/drivers/input/fingerprint/Makefile
obj-$(CONFIG_CDFINGER_FP_REE_FINGERPRINT) += cdfinger_fp_ree/
把驱动文件放到对应kernel目录:
kernel-3.18/drivers/input/fingerprint/cdfinger_fp_ree/
7、使用gpio工具配置gpio配置文件dws，
kernel-3.18/drivers/misc/mediatek/dws/mt6580/alongk80_bsp.dws
把kernel下的dws文件拷贝到其它对应目录，注意名称跟kernel不一样
vendor/mediatek/proprietary/bootable/bootloader/lk/target/alongk80_bsp/dct/dct/codegen.dws
vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/alongk80_bsp/dct/dct/codegen.dws
vendor/mediatek/proprietary/custom/alongk80_bsp/kernel/dct/dct/codegen.dws
然后编译kernel-3.18,驱动加载运行成功后会生成/dev/fpsdev0 的驱动设备节点。
8、上层的移植:
SELinux 权 限 位 于 软 件 包 android/device/cdfinger/sepolicy 目 录 下 , 其 中cdfinger.te 为新增文件,其它文件是在源码上追加。将 cdfinger 整个文件夹放到源 码 device 目 录 下 。 若 需 放 到 其 它 目 录 , 把 Android.mk 和
cdfinger_product_32bit.mk/cdfinger_product_64bit.mk 中 LOCAL_PATH 改成相应目录即可。
编译时 cdfinger 目录下的 Android.mk 中使用 BOARD_SEPOLICY_DIRS 将会把权限加入源码中。加入权限后第一次编译需要删除之前的中间文件,保证改动生效:
rm-rf out/target/product/xxxx/obj/ETC/sepolicy_intermediates
即把cdfinger文件夹拷贝到device目录下，注意使用的是64bit还算32bit，一般保留一个即可，本案例使用32bit的驱动，故没有把64bit的库文件放进device/cdfinger目录，而且使用cdfinger_product_32bit.mk文件。
修改device/along/alongk80_bsp/device.mk
— a/device/along/alongk80_bsp/device.mk
+++ b/device/along/alongk80_bsp/device.mk
@@ -183,3 +183,9 @@ PRODUCT_PACKAGES += \
FactoryTest \
MtkSoundRecorder
# end by chengl
+
+# add for cdfinger start by caizd
+PRODUCT_PACKAGES += android.hardware.biometrics.fingerprint@2.1-service
+
+$(call inherit-product, device/cdfinger/cdfinger_product_32bit.mk)
+# add for cdfinger end by caizd
vim device/mediatek/mt6580/manifest.xml添加cdfinger在设置的菜单选项:
+
+ android.hardware.biometrics.fingerprint
+ hwbinder
+ 2.1
+
+ IBiometricsFingerprint
+ default
+
+
9、在system/core/rootdir/init.rc
添加init.cdfinger.rc文件的引用:
+++ b/system/core/rootdir/init.rc
@@ -11,6 +11,10 @@ import /vendor/etc/init/hw/init.${ro.hardware}.rc
import /init.usb.configfs.rc
import /init.${ro.zygote}.rc
+# add for cdfinger start by caizd
+import /init.cdfinger.rc
+# add for cdfinger end by caizd
+