DevHeads IoT Integration Server•6mo ago

How can I resolve the "Failed to acquire I2C client" error in my kernel space I2C DAC implementation

@Middleware & OS How can I use the I2C bus(DAC) in kernel space, I have verified that the I2C adapter and address in kernel space, I expected to get a Successfully acquired i2c client message in my log but still getting the error Failed to acquire I2C client Here's my code

struct i2c_client *client;
struct i2c_adapter *adapter = i2c_get_adapter(1);
struct i2c_board_info info;
strlcpy(info.type, "i2c-dac", I2C_NAME_SIZE);
strlcpy(info.name, "My DAC", I2C_NAME_SIZE);
client = i2c_new_device(adapter, &info);
i2c_put_adapter(adapter);

struct i2c_client *client;
struct i2c_adapter *adapter = i2c_get_adapter(1);
struct i2c_board_info info;
strlcpy(info.type, "i2c-dac", I2C_NAME_SIZE);
strlcpy(info.name, "My DAC", I2C_NAME_SIZE);
client = i2c_new_device(adapter, &info);
i2c_put_adapter(adapter);

3 Replies

RED HAT•6mo ago

Hi @Boss lady , make sure that the I2C adapter index 1 is correct and that it corresponds to the correct I2C bus on your hardware. You can check this in the /sys/class/i2c-adapter directory.

Enthernet Code•6mo ago

@Boss lady check the value returned from the i2c_get_adapter of its correctly obtained, if it returns Null then there's issue with the adapter

Boss lady•6mo ago

Thanks @RED HAT I checked /sys/class/i2c-adapter and confirmed that index 1 is correct. I also enabled logging and saw that i2c_get_adapter is returning a valid pointer. The problem seems to be with i2c_new_device.

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How can I resolve the "Failed to acquire I2C client" error in my kernel space I2C DAC implementation