linux-kernel - Re: [RFC v3 4/7] platform: x86: Add generic Intel IPC driver

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Date:   Tue, 3 Oct 2017 18:07:18 -0700
From:   sathyanarayanan kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        "x86@...nel.org" <x86@...nel.org>,
        Wim Van Sebroeck <wim@...ana.be>,
        Ingo Molnar <mingo@...hat.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Zha Qipeng <qipeng.zha@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "dvhart@...radead.org" <dvhart@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Lee Jones <lee.jones@...aro.org>,
        Andy Shevchenko <andy@...radead.org>,
        Souvik Kumar Chakravarty <souvik.k.chakravarty@...el.com>,
        linux-rtc@...r.kernel.org, linux-watchdog@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Sathyanarayanan Kuppuswamy Natarajan <sathyaosid@...il.com>
Subject: Re: [RFC v3 4/7] platform: x86: Add generic Intel IPC driver

Hi,


On 10/01/2017 07:59 AM, Andy Shevchenko wrote:
> On Tue, Sep 5, 2017 at 8:37 AM,
> <sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
>> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>>
>> Currently intel_scu_ipc.c, intel_pmc_ipc.c and intel_punit_ipc.c
>> redundantly implements the same IPC features and has lot of code
>> duplication between them. This driver addresses this issue by grouping
>> the common IPC functionalities under the same driver.
>> +static const char *ipc_dev_err_string(struct intel_ipc_dev *ipc_dev,
>> +       int error)
>> +{
>> +       switch (error) {
>> +       case IPC_DEV_ERR_NONE:
>> +               return "No error";
>> +       case IPC_DEV_ERR_CMD_NOT_SUPPORTED:
>> +               return "Command not-supported/Invalid";
>> +       case IPC_DEV_ERR_CMD_NOT_SERVICED:
>> +               return "Command not-serviced/Invalid param";
>> +       case IPC_DEV_ERR_UNABLE_TO_SERVICE:
>> +               return "Unable-to-service/Cmd-timeout";
>> +       case IPC_DEV_ERR_CMD_INVALID:
>> +               return "Command-invalid/Cmd-locked";
>> +       case IPC_DEV_ERR_CMD_FAILED:
>> +               return "Command-failed/Invalid-VR-id";
>> +       case IPC_DEV_ERR_EMSECURITY:
>> +               return "Invalid Battery/VR-Error";
>> +       case IPC_DEV_ERR_UNSIGNEDKERNEL:
>> +               return "Unsigned kernel";
>> +       default:
>> +               return "Unknown Command";
>> +       };
>> +}
> Since it's continuous list you can define an array of messages like
>
> const char * const *errors = {
>   [..._ERR_...] = "",
>   ...
>
> };
>
> Also you can use enum in the header and define _ERR_MAX there.
> Thus, code would be transformed to
>
> if (error < _ERR_MAX)
>   return errors[error];
>
> return "Unknown Command";
Thanks will fix it in next version.
>

-- 
Sathyanarayanan Kuppuswamy
Linux kernel developer