linux-kernel - Re: [PATCH v1] input: make use of the input_set

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Date:	Wed, 7 Jan 2015 00:26:03 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Olliver Schinagl <oliver@...inagl.nl>
Cc:	Olliver Schinagl <oliver+list@...inagl.nl>,
	Wolfram Sang <wsa@...-dreams.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Jingoo Han <jg1.han@...sung.com>,
	"David S. Miller" <davem@...emloft.net>,
	Sam Ravnborg <sam@...nborg.org>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] input: make use of the input_set_capability helper

On Wed, Jan 07, 2015 at 09:19:28AM +0100, Olliver Schinagl wrote:
> Hey Dmitry,
> 
> On 07-01-15 08:57, Dmitry Torokhov wrote:
> >Hi Olliver,
> >
> >On Wed, Jan 07, 2015 at 08:31:06AM +0100, Olliver Schinagl wrote:
> >>From: Olliver Schinagl <oliver@...inagl.nl>
> >>
> >>Almost all of the speaker drivers under input manipulate the ev bits
> >>directly, which is not needed, as there is a helper available.
> >>
> >>This patch makes use of the helper for the speaker drivers.
> >>
> >>Signed-off-by: Olliver Schinagl <oliver@...inagl.nl>
> >>---
> >>  drivers/input/misc/cm109.c         | 4 ++--
> >>  drivers/input/misc/ixp4xx-beeper.c | 5 ++---
> >>  drivers/input/misc/m68kspkr.c      | 5 ++---
> >>  drivers/input/misc/pcspkr.c        | 5 ++---
> >>  drivers/input/misc/pwm-beeper.c    | 5 +----
> >>  drivers/input/misc/sparcspkr.c     | 6 ++----
> >>  6 files changed, 11 insertions(+), 19 deletions(-)
> >>
> >>diff --git a/drivers/input/misc/cm109.c b/drivers/input/misc/cm109.c
> >>index 9365535..8e41070 100644
> >>--- a/drivers/input/misc/cm109.c
> >>+++ b/drivers/input/misc/cm109.c
> >>@@ -767,10 +767,10 @@ static int cm109_usb_probe(struct usb_interface *intf,
> >>  	input_dev->keycodesize = sizeof(unsigned char);
> >>  	input_dev->keycodemax = ARRAY_SIZE(dev->keymap);
> >>-	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_SND);
> >>-	input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
> >>+	input_set_capability(input_dev, EV_SND, SND_BELL | SND_TONE);
> >No, input_set_capability() takes single event code, not bitmask. The
> >fact that it works for these 2 values of SND events is pure coincidence
> >(the old code wasn't much better though).

Ah, not, it does not work at all. Instead of setting bits 1 and 2 your
code sets bit 3 in dev->sndbit.

> What do you suggest we should do then? Fix input_set_capability to
> take bit masks? or multiline events?
> I'm not sure why __set_bits() wouldn't work for bitmasks, could you
> educate me?

Call it once per event:

	input_set_capability(input_dev, EV_SND, SND_BELL);
	input_set_capability(input_dev, EV_SND, SND_TONE);


> >
> >>  	/* register available key events */
> >>+	input_dev->evbit[0] = BIT_MASK(EV_KEY);
> >Would prefer __set_bit(EV_KEY, input_dev->evbit); here instead.
> I only moved the EV_KEY bit from above to its appropiate place here.

The original code was setting combination of bits; here we set single
one and __set_bit() is cleaner IMO.

> I can change this one (and others) to use __set_bit() for now for
> v2?

Yes, please.

Thanks.

-- 
Dmitry
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