linux-kernel - Re: [PATCH] mfd: Convert WM8350 to use request_threaded

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Date:	Thu, 17 Sep 2009 11:01:56 +0200
From:	Samuel Ortiz <sameo@...ux.intel.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: Convert WM8350 to use request_threaded_irq()

Hi Mark,

On Wed, Sep 16, 2009 at 07:07:32PM +0100, Mark Brown wrote:
> Instead of hand rolling our own variant.
Very nice. I expect many other mfd drivers will eventually go the same way.
I'll look at the ones I have HW for.

Applied, thanks.

Cheers,
Samuel.


> Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> ---
>  drivers/mfd/wm8350-core.c       |   24 ++++++------------------
>  include/linux/mfd/wm8350/core.h |    1 -
>  2 files changed, 6 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/mfd/wm8350-core.c b/drivers/mfd/wm8350-core.c
> index 9d662a5..ba27c9d 100644
> --- a/drivers/mfd/wm8350-core.c
> +++ b/drivers/mfd/wm8350-core.c
> @@ -353,15 +353,15 @@ static void wm8350_irq_call_handler(struct wm8350 *wm8350, int irq)
>  }
>  
>  /*
> - * wm8350_irq_worker actually handles the interrupts.  Since all
> + * This is a threaded IRQ handler so can access I2C/SPI.  Since all
>   * interrupts are clear on read the IRQ line will be reasserted and
>   * the physical IRQ will be handled again if another interrupt is
>   * asserted while we run - in the normal course of events this is a
>   * rare occurrence so we save I2C/SPI reads.
>   */
> -static void wm8350_irq_worker(struct work_struct *work)
> +static irqreturn_t wm8350_irq(int irq, void *data)
>  {
> -	struct wm8350 *wm8350 = container_of(work, struct wm8350, irq_work);
> +	struct wm8350 *wm8350 = data;
>  	u16 level_one, status1, status2, comp;
>  
>  	/* TODO: Use block reads to improve performance? */
> @@ -552,16 +552,6 @@ static void wm8350_irq_worker(struct work_struct *work)
>  		}
>  	}
>  
> -	enable_irq(wm8350->chip_irq);
> -}
> -
> -static irqreturn_t wm8350_irq(int irq, void *data)
> -{
> -	struct wm8350 *wm8350 = data;
> -
> -	disable_irq_nosync(irq);
> -	schedule_work(&wm8350->irq_work);
> -
>  	return IRQ_HANDLED;
>  }
>  
> @@ -1428,9 +1418,8 @@ int wm8350_device_init(struct wm8350 *wm8350, int irq,
>  
>  	mutex_init(&wm8350->auxadc_mutex);
>  	mutex_init(&wm8350->irq_mutex);
> -	INIT_WORK(&wm8350->irq_work, wm8350_irq_worker);
>  	if (irq) {
> -		int flags = 0;
> +		int flags = IRQF_ONESHOT;
>  
>  		if (pdata && pdata->irq_high) {
>  			flags |= IRQF_TRIGGER_HIGH;
> @@ -1444,8 +1433,8 @@ int wm8350_device_init(struct wm8350 *wm8350, int irq,
>  					  WM8350_IRQ_POL);
>  		}
>  
> -		ret = request_irq(irq, wm8350_irq, flags,
> -				  "wm8350", wm8350);
> +		ret = request_threaded_irq(irq, NULL, wm8350_irq, flags,
> +					   "wm8350", wm8350);
>  		if (ret != 0) {
>  			dev_err(wm8350->dev, "Failed to request IRQ: %d\n",
>  				ret);
> @@ -1505,7 +1494,6 @@ void wm8350_device_exit(struct wm8350 *wm8350)
>  	platform_device_unregister(wm8350->codec.pdev);
>  
>  	free_irq(wm8350->chip_irq, wm8350);
> -	flush_work(&wm8350->irq_work);
>  	kfree(wm8350->reg_cache);
>  }
>  EXPORT_SYMBOL_GPL(wm8350_device_exit);
> diff --git a/include/linux/mfd/wm8350/core.h b/include/linux/mfd/wm8350/core.h
> index 969b0b5..1d595de 100644
> --- a/include/linux/mfd/wm8350/core.h
> +++ b/include/linux/mfd/wm8350/core.h
> @@ -626,7 +626,6 @@ struct wm8350 {
>  	struct mutex auxadc_mutex;
>  
>  	/* Interrupt handling */
> -	struct work_struct irq_work;
>  	struct mutex irq_mutex; /* IRQ table mutex */
>  	struct wm8350_irq irq[WM8350_NUM_IRQ];
>  	int chip_irq;
> -- 
> 1.6.3.3
> 

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