linux-kernel - Re: [PATCH 2/2] usb: typec: tipd: Support wakeup

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Date:   Thu, 5 Jan 2023 13:49:08 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Jun Nie <jun.nie@...aro.org>
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        sven@...npeter.dev, shawn.guo@...aro.org,
        bryan.odonoghue@...aro.org
Subject: Re: [PATCH 2/2] usb: typec: tipd: Support wakeup

On Thu, Jan 05, 2023 at 03:50:58PM +0800, Jun Nie wrote:
> Enable wakeup when pluging or unpluging USB cable. It is up to other
> components to hold system in active mode, such as display, so that
> user can receive the notification.
> 
> Signed-off-by: Jun Nie <jun.nie@...aro.org>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/tipd/core.c | 38 +++++++++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 46a4d8b128f0..485b90c13078 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -95,6 +95,7 @@ struct tps6598x {
>  	struct power_supply_desc psy_desc;
>  	enum power_supply_usb_type usb_type;
>  
> +	int wakeup;
>  	u16 pwr_status;
>  };
>  
> @@ -846,6 +847,12 @@ static int tps6598x_probe(struct i2c_client *client)
>  	i2c_set_clientdata(client, tps);
>  	fwnode_handle_put(fwnode);
>  
> +	tps->wakeup = device_property_read_bool(tps->dev, "wakeup-source");
> +	if (tps->wakeup) {
> +		device_init_wakeup(&client->dev, true);
> +		enable_irq_wake(client->irq);
> +	}
> +
>  	return 0;
>  
>  err_disconnect:
> @@ -870,6 +877,36 @@ static void tps6598x_remove(struct i2c_client *client)
>  	usb_role_switch_put(tps->role_sw);
>  }
>  
> +static int __maybe_unused tps6598x_suspend(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct tps6598x *tps = i2c_get_clientdata(client);
> +
> +	if (tps->wakeup) {
> +		disable_irq(client->irq);
> +		enable_irq_wake(client->irq);
> +	}
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused tps6598x_resume(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct tps6598x *tps = i2c_get_clientdata(client);
> +
> +	if (tps->wakeup) {
> +		disable_irq_wake(client->irq);
> +		enable_irq(client->irq);
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops tps6598x_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(tps6598x_suspend, tps6598x_resume)
> +};
> +
>  static const struct of_device_id tps6598x_of_match[] = {
>  	{ .compatible = "ti,tps6598x", },
>  	{ .compatible = "apple,cd321x", },
> @@ -886,6 +923,7 @@ MODULE_DEVICE_TABLE(i2c, tps6598x_id);
>  static struct i2c_driver tps6598x_i2c_driver = {
>  	.driver = {
>  		.name = "tps6598x",
> +		.pm = &tps6598x_pm_ops,
>  		.of_match_table = tps6598x_of_match,
>  	},
>  	.probe_new = tps6598x_probe,
> -- 
> 2.34.1

thanks,

-- 
heikki