Linux/AM5728: How to add PCM186x driver to linux?

Alexander Romanovskiy

Part Number: AM5728

Tool/software: Linux

Hi,

we are making custom board with Linux based on am57xx-evm sdk (linux 4.4.19). Now we are tring to add PCM186x driver to linux .

I found 4 files on TI git:
- pcm186x.c;
- pcm186x.h;
- pcm186x-i2c.c;
- pcm186x-spi.c.

I have copied them to linux-folder/sound/soc/codecs

I have added next lines to linux-folder/sound/soc/codecs/makefile:
snd-soc-pcm1862x-objs := pcm186x.o
snd-soc-pcm1862x-i2c-objs := pcm186x-i2c.o
snd-soc-pcm1862x-spi-objs := pcm186x-spi.o
...
obj-$(CONFIG_SND_SOC_PCM186x) += snd-soc-pcm186x.o
obj-$(CONFIG_SND_SOC_PCM186x_I2C) += snd-soc-pcm186x-i2c.o
obj-$(CONFIG_SND_SOC_PCM186x_SPI) += snd-soc-pcm186x-spi.o

And of course I have added this lines to linux-folder/arch/arm/configs/tisdk_am57xx-evm_defconfig file:
CONFIG_SND_SOC_PCM186x=y
CONFIG_SND_SOC_PCM186x_I2C=y
CONFIG_SND_SOC_PCM186x_SPI=y

then I type 2 commands in terminal:
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- distclean
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- tisdk_am57xx-evm_defconfig

the last one makes .config file, but there are no my new lines about PCM186x configs.
Shell I add some else lines in other files?

Br,
Alexander.

over 8 years ago

0 Yordan Kovachev over 8 years ago

TI__Guru**** 161600 points

Hi Alexander,

You need to also modify the corresponding Kconfig files.

Best Regards,
Yordan

0 Alexander Romanovskiy over 8 years ago in reply to Yordan Kovachev

Intellectual 735 points

Hi,

I have modified kconfig files, PCM186x config lines appeared in xconfig, but there is no .o files, and no error messages.

So I tried to build out of tree module.

I made Makefile:

# Makefile – makefile of our first driver
 
# if KERNELRELEASE is defined, we've been invoked from the
# kernel build system and can use its language.
ifneq (${KERNELRELEASE},)
    obj-m := pcm186x-i2c.o
# Otherwise we were called directly from the command line.
# Invoke the kernel build system.
else
    KERNEL_SOURCE := /opt/ti-processor-sdk-linux-am57xx-evm-03.01.00.06/board-support/linux-4.4.19
    PWD := $(shell pwd)
default:
  ${MAKE} -C ${KERNEL_SOURCE} SUBDIRS=${PWD} modules
 
clean:
  ${MAKE} -C ${KERNEL_SOURCE} SUBDIRS=${PWD} clean
endif

and build it with make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- command.

It made .o and .ko file, but also it shows this warnings:
WARNING: "pcm186x_pm_ops" [/home/user1/Documents/pcm186x/pcm186x-i2c.ko] undefined!
WARNING: "pcm186x_probe" [/home/user1/Documents/pcm186x/pcm186x-i2c.ko] undefined!
WARNING: "pcm186x_regmap" [/home/user1/Documents/pcm186x/pcm186x-i2c.ko] undefined!
WARNING: "pcm186x_remove" [/home/user1/Documents/pcm186x/pcm186x-i2c.ko] undefined!

this variables are defined in pcm186x.c

So can you tell me please, how should I correctly build this driver?

Br,
Alexander

0 Tomas Vilda over 8 years ago in reply to Alexander Romanovskiy

Prodigy 45 points

Hello, you need pcm186x.o and pcm186x-i2c.o on obj-m line, here is my Makefile for building this driver out of tree

export ARCH:=arm
export CROSS_COMPILE:=arm-linux-gnueabihf-

ifneq ($(KERNELRELEASE),)
obj-m := pcm186x-i2c.o pcm186x.o pcm186x-spi.o
else
KDIR := /home/user/linux-y335x
all:
        $(MAKE) -C $(KDIR) M=$$PWD
clean:
        $(MAKE) -C $(KDIR) M=$$PWD clean
endif

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Linux/AM5728: How to add PCM186x driver to linux?