linux-kernel - Re: [PATCH 7/8] mfd: pm8921: Implement irq_get_irqchip

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Date:	Thu, 18 Jun 2015 08:32:16 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Kumar Gala <galak@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>
CC:	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-soc@...r.kernel.org" <linux-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/8] mfd: pm8921: Implement irq_get_irqchip_state

Hi Bjorn,

On 18/06/15 07:47, Bjorn Andersson wrote:
> Implement irq_chip->irq_get_irqchip_state to make it possible for PMIC
> block drivers to access the IRQ real time status bits. The status bits
> are used for various kinds of input signals, e.g. GPIO.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> ---
> 
> This patch can be picked up independently of the rest of the series.
> 
>  drivers/mfd/pm8921-core.c | 43 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
> 
> diff --git a/drivers/mfd/pm8921-core.c b/drivers/mfd/pm8921-core.c
> index 5a92646a2ccb..5f81ba0c50f5 100644
> --- a/drivers/mfd/pm8921-core.c
> +++ b/drivers/mfd/pm8921-core.c
> @@ -236,11 +236,54 @@ static int pm8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
>  	return pm8xxx_config_irq(chip, block, config);
>  }
>  
> +static int pm8xxx_irq_get_irqchip_state(struct irq_data *d,
> +					enum irqchip_irq_state which,
> +					bool *state)
> +{
> +	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
> +	unsigned int pmirq = irqd_to_hwirq(d);
> +	unsigned int bits;
> +	int irq_bit;
> +	u8 block;
> +	int rc;
> +
> +	if (!chip) {
> +		pr_err("Failed to resolve pm_irq_chip\n");
> +		return -EINVAL;
> +	}

Why do you need to check this? Is there any code path that could
actually trigger this?

> +
> +	if (which != IRQCHIP_STATE_LINE_LEVEL)
> +		return -EINVAL;
> +
> +	block = pmirq / 8;
> +	irq_bit = pmirq % 8;
> +
> +	spin_lock(&chip->pm_irq_lock);
> +	rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, block);
> +	if (rc) {
> +		pr_err("Failed Selecting Block %d rc=%d\n", block, rc);
> +		goto bail;
> +	}
> +
> +	rc = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_RT_STATUS, &bits);
> +	if (rc) {
> +		pr_err("Failed Reading Status rc=%d\n", rc);
> +		goto bail;
> +	}
> +
> +	*state = !!(bits & BIT(irq_bit));
> +bail:
> +	spin_unlock(&chip->pm_irq_lock);
> +
> +	return rc ? rc : 0;

I think you can just have "return rc;" here.

> +}
> +
>  static struct irq_chip pm8xxx_irq_chip = {
>  	.name		= "pm8xxx",
>  	.irq_mask_ack	= pm8xxx_irq_mask_ack,
>  	.irq_unmask	= pm8xxx_irq_unmask,
>  	.irq_set_type	= pm8xxx_irq_set_type,
> +	.irq_get_irqchip_state = pm8xxx_irq_get_irqchip_state,
>  	.flags		= IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE,
>  };
>  
> 

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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