Re: how to gracefully unload an i2c driver if chip not detected?

[Wolfram Sang]

Hi,

thanks, that helped, I think:

>     //test for device presence
>     if(vcnl4010_read_transfer(data, VCNL4010_PROD_ID_VER, &reg_val, 1) !=0 )
>     {
>         pr_err("vcnl4010: Device not found!");
>         goto nochip;
>     }
> 
>     if(reg_val != 0x21)
>     {
>         pr_err("vcnl4010: Found device isn't a vcnl4010, is a vcnl4000 
> installed?");
>         goto badchip;
>     }

You should set 'ret = -Esomething' here. Currently, you return 0 which
means success, so the driver core thinks it may call the suspend
function.

Regards,

   Wolfram

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