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Linux/LP55231: Issues with integrating LP55231 linux device driver

Aravindhan Gunasekaran
Prodigy 60 points
Part Number: LP55231

Tool/software: Linux

Hi All,

I am trying to integrate the LP55231 linux device driver with our ARM based board running openwrt. I am able to see /sys entries but when i try to load firmware i see the following error.

[ 6219.827586] lp5523x 0-0032: Direct firmware load for lp55231 failed with error -2
[ 6219.836484] lp5523x 0-0032: Falling back to user helper

I am trying to load the firmware with the following commands:-

echo 3 > /sys/bus/i2c/devices/0-0032/select_engine
echo 1 > /sys/class/firmware/lp55231/loading
echo "9d0740ff7e0040007e00a0010000" > /sys/class/firmware/lp55231/data
echo 0 > /sys/class/firmware/lp55231/loading
echo "000001100" > /sys/bus/i2c/devices/0-0032/engine3_leds
echo 1 > /sys/bus/i2c/devices/0-0032/run_engine

The following forum https://e2e.ti.com/support/power_management/led_driver/f/192/t/421131 

Can someone help here?

Thanks,

Aravind

  • 0
    Prodigy 60 points
    The following forum e2e.ti.com/.../421131 did not help (pls compare the errors)
  • 0
    TI__Expert 4445 points

    Hi Aravind,

    I am supporting this device but I am not the expert in Liunx.

    I have some sample code which can works in the Liunx.

    Could you send email to summer-su@ti.com, then I can send it to you for referecne.

    The other hand, I will contact TI internal Liunix expert to look in the issue.

    But I am not sure feedback, it may take 2 weeks.

    Let me know what is your thinking.

    Thanks!

    Summer Su 

  • 0 in reply to Aravindhan Gunasekaran
    TI__Intellectual 1120 points

    Aravindhan,

    Did you verify that things mentioned in thread you linked are done in your system?

    1) Kernel built with configuration option CONFIG_FW_LOADER_USER_HELPER=y

    2) You have patched version of led-lp55xx-common.c. Looking at kernel source tree, this patch shows first time in version 4.2. If you have older version, changes are you have to patch the driver by yourself.

    diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
    index f23c315..94b2cda 100644
    --- a/drivers/leds/leds-lp55xx-common.c
    +++ b/drivers/leds/leds-lp55xx-common.c
    @@ -237,7 +237,7 @@ static int lp55xx_request_firmware(struct lp55xx_chip *chip)
         const char *name = chip->cl->name;
         struct device *dev = &chip->cl->dev;
     
    -    return request_firmware_nowait(THIS_MODULE, true, name, dev,
    +    return request_firmware_nowait(THIS_MODULE, false, name, dev,
                     GFP_KERNEL, chip, lp55xx_firmware_loaded);
     }

    Regards,

    Juha

  • 0 in reply to Juha Karttunen
    Prodigy 60 points
    Juha,

    These items were taken care.
  • 0
    Prodigy 60 points
    Hi All,

    Identified the issue. The Device tree entry for current setting was very less. Increased the current values and is working fine now.

    And BTW, the error I mentioned in the description was just a warning. There are two methods to load firmware to LP55231 via the linux driver, 1. Firmware should be present in predefined location like /lib/firmware/updates/lp55231,etc . - this is for automatic firmware upgrade. 2. User can provide firmware on the fly at /sys/class/firmware/lp55231.

    If firmware is not available in predefined location, firmware loader falls back to User helper(option 2). Ideally, this is not error, just a info log.

    Regards,
    Aravindhan.