linux-kernel - Re: [PATCH 1/2] pwm: Add stubs for pwm operations

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Date:	Thu, 26 May 2011 17:01:13 +0530
From:	Mohan Pallaka <mpallaka@...eaurora.org>
To:	Mohan Pallaka <mpallaka@...eaurora.org>, dmitry.torokhov@...il.com,
	linux@....linux.org.uk, rmk+kernel@....linux.org.uk
CC:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH 1/2] pwm: Add stubs for pwm operations

  Hi Russell, please let me know if this patch looks okay for you.

Thanks, Mohan.

On 5/24/2011 4:34 PM, Mohan Pallaka wrote:
>  Ping.
>
> Hi Russell, please take sometime to review this patch.
>
> Thanks, Mohan.
>
> On 5/21/2011 8:00 PM, Mohan Pallaka wrote:
>>  On 5/20/2011 10:29 AM, Mohan Pallaka wrote:
>>> Chip drivers that support both pwm and non-pwm modes
>>> would encounter compilation errors if the platform doesn't
>>> have support for pwm, even though the chip is programmed
>>> to work in non-pwm mode. Add stubs for pwm functions to
>>> avoid compilation errors in these scenarios.
>>>
>>> Signed-off-by: Mohan Pallaka<mpallaka@...eaurora.org>
>>> ---
>>>   include/linux/pwm.h |   23 +++++++++++++++++++++++
>>>   1 files changed, 23 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/include/linux/pwm.h b/include/linux/pwm.h
>>> index 7c77575..54877f6 100644
>>> --- a/include/linux/pwm.h
>>> +++ b/include/linux/pwm.h
>>> @@ -3,6 +3,7 @@
>>>
>>>   struct pwm_device;
>>>
>>> +#if defined(CONFIG_HAVE_PWM)
>>>   /*
>>>    * pwm_request - request a PWM device
>>>    */
>>> @@ -28,4 +29,26 @@ int pwm_enable(struct pwm_device *pwm);
>>>    */
>>>   void pwm_disable(struct pwm_device *pwm);
>>>
>>> +#else
>>> +
>>> +struct pwm_device *pwm_request(int pwm_id, const char *label)
>>> +{
>>> +    return NULL;
>>> +}
>>> +
>>> +void pwm_free(struct pwm_device *pwm) { }
>>> +
>>> +int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
>>> +{
>>> +    return -EINVAL;
>>> +}
>>> +
>>> +int pwm_enable(struct pwm_device *pwm)
>>> +{
>>> +    return -EINVAL;
>>> +}
>>> +
>>> +void pwm_disable(struct pwm_device *pwm) { }
>>> +
>>> +#endif /* CONFIG_HAVE_PWM */
>>>   #endif /* __LINUX_PWM_H */
>>> -- 
>>> Sent by a consultant of the Qualcomm Innovation Center, Inc.
>>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
>>> Forum.
>> Hi Russell, please review this patch.
>>
>> --Mohan
>> -- 
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