linux-kernel - Re: [PATCH v1] power: supply: smb347-charger: Fix interrupt usage if interrupt is unavailable

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Date:   Thu, 28 Jan 2021 01:34:27 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] power: supply: smb347-charger: Fix interrupt usage if
 interrupt is unavailable

Hi,

On Fri, Jan 22, 2021 at 10:17:34PM +0300, Dmitry Osipenko wrote:
> The IRQ=0 could be a valid interrupt number in kernel because interrupt
> numbers are virtual in a modern kernel. Hence fix the interrupt usage in
> a case if interrupt is unavailable by not overriding the interrupt number
> which is used by the driver.
> 
> Note that currently Nexus 7 is the only know device which uses SMB347
> kernel diver and it has a properly working interrupt, hence this patch
> doesn't fix any real problems, it's a minor cleanup/improvement.
> 
> Fixes: 99298de5df92 ("power: supply: smb347-charger: Replace mutex with IRQ disable/enable")
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---

Thanks, queued.

-- Sebastian

>  drivers/power/supply/smb347-charger.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/power/supply/smb347-charger.c b/drivers/power/supply/smb347-charger.c
> index d3bf35ed12ce..8cfbd8d6b478 100644
> --- a/drivers/power/supply/smb347-charger.c
> +++ b/drivers/power/supply/smb347-charger.c
> @@ -137,6 +137,7 @@
>   * @mains_online: is AC/DC input connected
>   * @usb_online: is USB input connected
>   * @charging_enabled: is charging enabled
> + * @irq_unsupported: is interrupt unsupported by SMB hardware
>   * @max_charge_current: maximum current (in uA) the battery can be charged
>   * @max_charge_voltage: maximum voltage (in uV) the battery can be charged
>   * @pre_charge_current: current (in uA) to use in pre-charging phase
> @@ -193,6 +194,7 @@ struct smb347_charger {
>  	bool			mains_online;
>  	bool			usb_online;
>  	bool			charging_enabled;
> +	bool			irq_unsupported;
>  
>  	unsigned int		max_charge_current;
>  	unsigned int		max_charge_voltage;
> @@ -862,6 +864,9 @@ static int smb347_irq_set(struct smb347_charger *smb, bool enable)
>  {
>  	int ret;
>  
> +	if (smb->irq_unsupported)
> +		return 0;
> +
>  	ret = smb347_set_writable(smb, true);
>  	if (ret < 0)
>  		return ret;
> @@ -923,8 +928,6 @@ static int smb347_irq_init(struct smb347_charger *smb,
>  	ret = regmap_update_bits(smb->regmap, CFG_STAT,
>  				 CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
>  				 CFG_STAT_DISABLED);
> -	if (ret < 0)
> -		client->irq = 0;
>  
>  	smb347_set_writable(smb, false);
>  
> @@ -1345,6 +1348,7 @@ static int smb347_probe(struct i2c_client *client,
>  		if (ret < 0) {
>  			dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
>  			dev_warn(dev, "disabling IRQ support\n");
> +			smb->irq_unsupported = true;
>  		} else {
>  			smb347_irq_enable(smb);
>  		}
> @@ -1357,8 +1361,8 @@ static int smb347_remove(struct i2c_client *client)
>  {
>  	struct smb347_charger *smb = i2c_get_clientdata(client);
>  
> -	if (client->irq)
> -		smb347_irq_disable(smb);
> +	smb347_irq_disable(smb);
> +
>  	return 0;
>  }
>  
> -- 
> 2.29.2
> 

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