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

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Date:	Tue, 24 May 2011 16:34:57 +0530
From:	Mohan Pallaka <mpallaka@...eaurora.org>
To:	Mohan Pallaka <mpallaka@...eaurora.org>
CC:	dmitry.torokhov@...il.com, linux@....linux.org.uk,
	rmk+kernel@....linux.org.uk, 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, rmk@...-67.arm.linux.org.uk
Subject: Re: [PATCH 1/2] pwm: Add stubs for pwm operations

  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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