linux-kernel - Re: [PATCH] thermal: st: Add support for STiH41x thermal sensors

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Date:	Mon, 23 Sep 2013 13:56:20 +0530
From:	Ajit Pal Singh <ajitpal.singh@...com>
To:	Eduardo Valentin <eduardo.valentin@...com>
Cc:	"rui.zhang@...el.com" <rui.zhang@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rob@...dley.net" <rob@...dley.net>,
	Stephen GALLIMORE <stephen.gallimore@...com>,
	Srinivas KANDAGATLA <srinivas.kandagatla@...com>
Subject: Re: [PATCH] thermal: st: Add support for STiH41x thermal sensors

On Thursday 19 September 2013 01:32 AM, Eduardo Valentin wrote:
> On 18-09-2013 05:38, Ajit Pal Singh wrote:
>> Adds support for thermal sensors on STiH41x series SOCs.
>> Single trip point 'THERMAL_TRIP_CRITICAL' is supported.
>> STIH416 MPE sensor supports interrupt reporting when a preset
>> threshold temperature is crossed.
>> For rest of the thermal sensors a polling delay of 10000ms is
>> set.
>>
>> CC: Stephen Gallimore <stephen.gallimore@...com>
>> CC: Srinivas Kandagatla <srinivas.kandagatla@...com>
>> Signed-off-by: Ajit Pal Singh <ajitpal.singh@...com>
[snip]
>> +static irqreturn_t st_thermal_thresh_int(int irq, void *data)
>> +{
>> +	struct st_thermal_sensor *sensor = data;
>> +	struct device *dev = sensor_to_dev(sensor);
>> +
>> +	dev_dbg(dev, "%s,called\n", __func__);
>> +	thermal_zone_device_update(sensor->th_dev);
>
> Are you sure you want to do this here? The above call might sleep.

Have used devm_request_threaded_irq() to register the above threaded irq 
handler. Calling sleep-able calls from the threaded interrupt handler 
should be OK ?
>
>> +	return IRQ_HANDLED;
>> +}
[snip]
>> +static int st_thermal_notify(struct thermal_zone_device *th,
>> +			       int trip, enum thermal_trip_type type)
>> +{
>> +	struct st_thermal_sensor *sensor = thzone_to_sensor(th);
>> +	struct device *dev = sensor_to_dev(sensor);
>> +
>> +	switch (type) {
>> +	case THERMAL_TRIP_CRITICAL:
>> +		/* TODO: Send event to user space */
>
> It depends on what you mean by that. The core code will attempt to call
> the shutdown command, in user space.

Will remove the comment in the next version of the patch.
>
>> +		dev_err(dev, "Critical temp reached:Going for shutdown\n");
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +	return 0;
>> +}
>> +
[snip]
>> +module_platform_driver(st_thermal_driver);
>> +MODULE_AUTHOR("STMicroelectronics (R&D) Limited");
>> +MODULE_DESCRIPTION("STMicroelectronics STIH41x SOC thermal sensor driver");
>> +MODULE_LICENSE("GPL");
>
> GPL v2?

OK.Will make it GPLv2
>

Thanks
Ajit Pal Singh

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