查看文档 用户驱动可参考 Firefly adc demo :kernel/drivers/iio/adc/adc-firefly-demo.c
但是在该文件夹中并没有找到adc-firefly的驱动代码
ad7266.c ep93xx_adc.c meson_saradc.c stx104.c
ad7291.c exynos_adc.c modules.builtin sun4i-gpadc-iio.c
ad7298.c fsl-imx25-gcq.c modules.order ti-adc081c.c
ad7476.c gpio_muxadc.c mt6577_auxadc.c ti-adc0832.c
ad7766.c hi8435.c mxs-lradc-adc.c ti-adc084s021.c
ad7791.c hx711.c nau7802.c ti-adc108s102.c
ad7793.c imx7d_adc.c palmas_gpadc.c ti-adc12138.c
ad7887.c ina2xx-adc.c qcom-pm8xxx-xoadc.c ti-adc128s052.c
ad7923.c Kconfig qcom-spmi-iadc.c ti-adc161s626.c
ad799x.c lp8788_adc.c qcom-spmi-vadc.c ti-ads1015.c
ad_sigma_delta.c lpc18xx_adc.c qcom-vadc-common.c ti-ads7950.c
aspeed_adc.c lpc32xx_adc.c qcom-vadc-common.h ti-ads8688.c
at91_adc.c ltc2471.c rcar-gyroadc.c ti_am335x_adc.c
at91-sama5d2_adc.c ltc2485.c rockchip_saradc.c ti-tlc4541.c
axp20x_adc.c ltc2497.c rockchip_saradc.o twl4030-madc.c
axp288_adc.c Makefile sc27xx_adc.c twl6030-gpadc.c
bcm_iproc_adc.c max1027.c sd_adc_modulator.c vf610_adc.c
berlin2-adc.c max11100.c spear_adc.c viperboard_adc.c
built-in.a max1118.c stm32-adc.c xilinx-xadc-core.c
cc10001_adc.c max1363.c stm32-adc-core.c xilinx-xadc-events.c
cpcap-adc.c max9611.c stm32-adc-core.h xilinx-xadc.h
da9150-gpadc.c mcp320x.c stm32-dfsdm-adc.c
dln2-adc.c mcp3422.c stm32-dfsdm-core.c
envelope-detector.c men_z188_adc.c stm32-dfsdm.h