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

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Message-ID: <4DD7CC83.1020700@codeaurora.org>
Date:	Sat, 21 May 2011 20:00:27 +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

  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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