linux-kernel - Re: [PATCH v2] Input: pwm-beeper: support customized freq for SND

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Date:   Tue, 28 Feb 2017 06:20:05 +0100
From:   Heiko Schocher <hs@...x.de>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-input@...r.kernel.org, Guan Ben <ben.guan@...bosch.com>,
        Mark Jonas <mark.jonas@...bosch.com>,
        devicetree@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        linux-kernel@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Manfred Schlaegl <manfred.schlaegl@....at>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2] Input: pwm-beeper: support customized freq for
 SND_BELL

Hello Rob,

Am 27.02.2017 um 20:10 schrieb Rob Herring:
> On Mon, Feb 20, 2017 at 09:37:43AM +0100, Heiko Schocher wrote:
>> From: Guan Ben <ben.guan@...bosch.com>
>>
>> extend the pwm-beeper driver to support customized frequency
>> for SND_BELL from device tree.
>>
>> Signed-off-by: Guan Ben <ben.guan@...bosch.com>
>> Signed-off-by: Mark Jonas <mark.jonas@...bosch.com>
>> [hs@...x.de: adapted to 4.10-rc7]
>> Signed-off-by: Heiko Schocher <hs@...x.de>
>>
>> ---
>>
>> Changes in v2:
>> - add comment from Rob Herring:
>>    rename property name "bell-frequency" to "beeper-hz"
>> - add comment from Dmitry Torokhov:
>>    use device_property_read_u32() instead of of_property_read_u32()
>> - rebased against c470abd4fde40ea6a0846a2beab642a578c0b8cd
>>    Linux 4.10
>>
>>   .../devicetree/bindings/input/pwm-beeper.txt       |  3 ++
>
> Acked-by: Rob Herring <robh@...nel.org>

Thanks!

> A few comments on the driver though.
>
>>   drivers/input/misc/pwm-beeper.c                    | 36 ++++++++++++++++------
>>   2 files changed, 30 insertions(+), 9 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/input/pwm-beeper.txt b/Documentation/devicetree/bindings/input/pwm-beeper.txt
>> index be332ae..4e4e128 100644
>> --- a/Documentation/devicetree/bindings/input/pwm-beeper.txt
>> +++ b/Documentation/devicetree/bindings/input/pwm-beeper.txt
>> @@ -5,3 +5,6 @@ Registers a PWM device as beeper.
>>   Required properties:
>>   - compatible: should be "pwm-beeper"
>>   - pwms: phandle to the physical PWM device
>> +
>> +optional properties:
>> +- beeper-hz:  bell frequency in Hz
>> diff --git a/drivers/input/misc/pwm-beeper.c b/drivers/input/misc/pwm-beeper.c
>> index 5f9655d..5ea6fda 100644
>> --- a/drivers/input/misc/pwm-beeper.c
>> +++ b/drivers/input/misc/pwm-beeper.c
>> @@ -27,6 +27,7 @@ struct pwm_beeper {
>>   	struct pwm_device *pwm;
>>   	struct work_struct work;
>>   	unsigned long period;
>> +	unsigned int bell_frequency;
>>   };
>>
>>   #define HZ_TO_NANOSECONDS(x) (1000000000UL/(x))
>> @@ -58,20 +59,17 @@ static int pwm_beeper_event(struct input_dev *input,
>>   	if (type != EV_SND || value < 0)
>>   		return -EINVAL;
>>
>> -	switch (code) {
>> -	case SND_BELL:
>> -		value = value ? 1000 : 0;
>> -		break;
>> -	case SND_TONE:
>> -		break;
>> -	default:
>> +	if (code != SND_BELL && code != SND_TONE)
>>   		return -EINVAL;
>> -	}
>>
>>   	if (value == 0)
>>   		beeper->period = 0;
>> -	else
>> +	else {
>> +		if (code == SND_BELL)
>> +			value = beeper->bell_frequency;
>> +
>>   		beeper->period = HZ_TO_NANOSECONDS(value);
>> +	}
>>
>>   	schedule_work(&beeper->work);
>>
>> @@ -93,6 +91,25 @@ static void pwm_beeper_close(struct input_dev *input)
>>   	pwm_beeper_stop(beeper);
>>   }
>>
>> +static void pwm_beeper_init_bell_frequency(struct device *dev,
>> +					   struct pwm_beeper *beeper)
>> +{
>> +	struct device_node *node;
>> +	unsigned int bell_frequency = 1000;
>> +	int err;
>> +
>> +	if (IS_ENABLED(CONFIG_OF)) {
>
> You don't really need this. There should be an empty version of the
> function.

removed, as also David mentioned this.

>
>> +		node = dev->of_node;
>
> You don't need this line.

Yep, removed.

>
>> +		err = device_property_read_u32(dev, "beeper-hz",
>> +					       &bell_frequency);
>> +		if (err < 0)
>> +			dev_dbg(dev, "Failed to read beeper-hz, using default: %u Hz\n",
>> +				bell_frequency);
>> +	}
>> +
>> +	beeper->bell_frequency = bell_frequency;
>> +}
>> +
>>   static int pwm_beeper_probe(struct platform_device *pdev)
>>   {
>>   	unsigned long pwm_id = (unsigned long)dev_get_platdata(&pdev->dev);
>> @@ -122,6 +139,7 @@ static int pwm_beeper_probe(struct platform_device *pdev)
>>   	pwm_apply_args(beeper->pwm);
>>
>>   	INIT_WORK(&beeper->work, pwm_beeper_work);
>> +	pwm_beeper_init_bell_frequency(&pdev->dev, beeper);
>>
>>   	beeper->input = input_allocate_device();
>>   	if (!beeper->input) {
>> --
>> 2.7.4
>>
>

Thanks!

bye,
Heiko
-- 
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