linux-kernel - Re: [PATCH 3/9] power: supply: smb347-charger: Use resource-managed API

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Date:   Sun, 10 May 2020 18:33:26 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     David Heidelberg <david@...t.cz>
Cc:     Jonghwa Lee <jonghwa3.lee@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Myungjoo Ham <myungjoo.ham@...sung.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        Vinay Simha BN <simhavcs@...il.com>,
        mika.westerberg@...ux.intel.com, ramakrishna.pallala@...el.com,
        Dmitry Osipenko <digetx@...il.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/9] power: supply: smb347-charger: Use resource-managed
 API

Hi,

On Sun, Mar 29, 2020 at 06:15:46PM +0200, David Heidelberg wrote:
> Simplify code, more convenient to use with Device Tree.
> 
> Reviewed-by: Dmitry Osipenko <digetx@...il.com>
> Signed-off-by: David Heidelberg <david@...t.cz>
> ---

Generally I like this change a lot, but it changes the removal
order, so that the IRQ is only free'd after power-supply has
already been unregistered. While it is disabled in the sm347 I
think it's better to keep the previous order to be on the safe
side.

This can easily achieved by having another patch moving from
power_supply_register to devm_power_supply_register, which will
further cleanup the code as a nice side-effect.

-- Sebastian

>  drivers/power/supply/smb347-charger.c | 45 +++++++++++++--------------
>  1 file changed, 21 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/power/supply/smb347-charger.c b/drivers/power/supply/smb347-charger.c
> index f99026d81f2a..4add9f64ba90 100644
> --- a/drivers/power/supply/smb347-charger.c
> +++ b/drivers/power/supply/smb347-charger.c
> @@ -836,21 +836,31 @@ static int smb347_irq_init(struct smb347_charger *smb,
>  			   struct i2c_client *client)
>  {
>  	const struct smb347_charger_platform_data *pdata = smb->pdata;
> -	int ret, irq = gpio_to_irq(pdata->irq_gpio);
> +	unsigned long irqflags = IRQF_ONESHOT;
> +	int ret;
>  
> -	ret = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
> -	if (ret < 0)
> -		goto fail;
> +	/* Requesting GPIO for IRQ is only needed in non-DT way */
> +	if (!client->irq) {
> +		int irq = gpio_to_irq(pdata->irq_gpio);
> +
> +		ret = devm_gpio_request_one(smb->dev, pdata->irq_gpio,
> +					    GPIOF_IN, client->name);
> +		if (ret < 0)
> +			return ret;
> +
> +		irqflags |= IRQF_TRIGGER_FALLING;
> +		client->irq = irq;
> +	}
>  
> -	ret = request_threaded_irq(irq, NULL, smb347_interrupt,
> -				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> -				   client->name, smb);
> +	ret = devm_request_threaded_irq(smb->dev, client->irq, NULL,
> +					smb347_interrupt, irqflags,
> +					client->name, smb);
>  	if (ret < 0)
> -		goto fail_gpio;
> +		return ret;
>  
>  	ret = smb347_set_writable(smb, true);
>  	if (ret < 0)
> -		goto fail_irq;
> +		return ret;
>  
>  	/*
>  	 * Configure the STAT output to be suitable for interrupts: disable
> @@ -860,20 +870,10 @@ static int smb347_irq_init(struct smb347_charger *smb,
>  				 CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
>  				 CFG_STAT_DISABLED);
>  	if (ret < 0)
> -		goto fail_readonly;
> +		client->irq = 0;
>  
>  	smb347_set_writable(smb, false);
> -	client->irq = irq;
> -	return 0;
>  
> -fail_readonly:
> -	smb347_set_writable(smb, false);
> -fail_irq:
> -	free_irq(irq, smb);
> -fail_gpio:
> -	gpio_free(pdata->irq_gpio);
> -fail:
> -	client->irq = 0;
>  	return ret;
>  }
>  
> @@ -1299,11 +1299,8 @@ static int smb347_remove(struct i2c_client *client)
>  {
>  	struct smb347_charger *smb = i2c_get_clientdata(client);
>  
> -	if (client->irq) {
> +	if (client->irq)
>  		smb347_irq_disable(smb);
> -		free_irq(client->irq, smb);
> -		gpio_free(smb->pdata->irq_gpio);
> -	}
>  
>  	power_supply_unregister(smb->battery);
>  	if (smb->pdata->use_usb)
> -- 
> 2.25.0
> 

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