linux-kernel - Re: [PATCH] power_supply: rt9455_charger: Properly notify userspace about charging events

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Message-ID: <CAJKOXPcbGLo9BvU_7+OdMZ_PcMp6+ZaUWh46APxgMg3nyZ-SdQ@mail.gmail.com>
Date:	Thu, 2 Jul 2015 09:49:46 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Anda-Maria Nicolae <anda-maria.nicolae@...el.com>
Cc:	sre@...nel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH] power_supply: rt9455_charger: Properly notify userspace
 about charging events

2015-06-18 1:28 GMT+09:00 Anda-Maria Nicolae <anda-maria.nicolae@...el.com>:
> Do not call power_supply_changed() when CHRVPI interrupt has occurred.

What I cannot find here is the answer to: why? I am not familiar with
the driver so this is just guessing that you wanted to notify
userspace about connected/disconnected charger. In both cases (before
and after the patch) this is achieved, isn't it?

Best regards,
Krzysztof


> CHRVPI interrupt occurs when the charger is connected to or disconnected
> from the power source. Call power_supply_changed() after PWR_RDY bit is
> read, to distinguish between connection to or disconnection from the power
> source.
> Also, call power_supply_changed() after the battery is reconnected to the
> charger, to notify userspace that the battery is no longer absent.
>
> Signed-off-by: Anda-Maria Nicolae <anda-maria.nicolae@...el.com>
> ---
>  drivers/power/rt9455_charger.c |   16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/power/rt9455_charger.c b/drivers/power/rt9455_charger.c
> index 08baac6..a49a9d4 100644
> --- a/drivers/power/rt9455_charger.c
> +++ b/drivers/power/rt9455_charger.c
> @@ -973,7 +973,6 @@ static int rt9455_irq_handler_check_irq2_register(struct rt9455_info *info,
>
>         if (irq2 & GET_MASK(F_CHRVPI)) {
>                 dev_dbg(dev, "Charger fault occurred\n");
> -               alert_userspace = true;
>                 /*
>                  * CHRVPI bit is set in 2 cases:
>                  * 1. when the power source is connected to the charger.
> @@ -981,6 +980,9 @@ static int rt9455_irq_handler_check_irq2_register(struct rt9455_info *info,
>                  * To identify the case, PWR_RDY bit is checked. Because
>                  * PWR_RDY bit is set / cleared after CHRVPI interrupt is
>                  * triggered, it is used delayed_work to later read PWR_RDY bit.
> +                * Also, do not set to true alert_userspace, because there is no
> +                * need to notify userspace when CHRVPI interrupt has occurred.
> +                * Userspace will be notified after PWR_RDY bit is read.
>                  */
>                 queue_delayed_work(system_power_efficient_wq,
>                                    &info->pwr_rdy_work,
> @@ -1178,7 +1180,7 @@ static irqreturn_t rt9455_irq_handler_thread(int irq, void *data)
>                 /*
>                  * Sometimes, an interrupt occurs while rt9455_probe() function
>                  * is executing and power_supply_register() is not yet called.
> -                * Do not call power_supply_charged() in this case.
> +                * Do not call power_supply_changed() in this case.
>                  */
>                 if (info->charger)
>                         power_supply_changed(info->charger);
> @@ -1478,6 +1480,11 @@ static void rt9455_pwr_rdy_work_callback(struct work_struct *work)
>                                    RT9455_MAX_CHARGING_TIME * HZ);
>                 break;
>         }
> +       /*
> +        * Notify userspace that the charger has been either connected to or
> +        * disconnected from the power source.
> +        */
> +       power_supply_changed(info->charger);
>  }
>
>  static void rt9455_max_charging_time_work_callback(struct work_struct *work)
> @@ -1533,6 +1540,11 @@ static void rt9455_batt_presence_work_callback(struct work_struct *work)
>                         if (ret)
>                                 dev_err(dev, "Failed to unmask BATAB interrupt\n");
>                 }
> +               /*
> +                * Notify userspace that the battery is now connected to the
> +                * charger.
> +                */
> +               power_supply_changed(info->charger);
>         }
>  }
>
> --
> 1.7.9.5
>
> --
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