Messages in this thread | | | Date | Fri, 25 Nov 2011 16:00:49 +0100 | From | Jean-Christophe PLAGNIOL-VILLARD <> | Subject | Re: [PATCH 2/2] gpiolib: introduce gpio_set_deglitch |
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On 16:14 Fri 25 Nov , Felipe Balbi wrote: > Hi, > > On Fri, Nov 25, 2011 at 03:08:40PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote: > > this will allow to manage the Glitch Input Filter > > as present on AT91 as example > > > > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> > > Cc: Nicolas Ferre <nicolas.ferre@atmel.com> > > Cc: Grant Likely <grant.likely@secretlab.ca> > > --- > > drivers/gpio/gpiolib.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ > > include/asm-generic/gpio.h | 4 ++++ > > include/linux/gpio.h | 5 +++++ > > 3 files changed, 53 insertions(+), 0 deletions(-) > > > > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c > > index b7e5e75..d2b1833 100644 > > --- a/drivers/gpio/gpiolib.c > > +++ b/drivers/gpio/gpiolib.c > > @@ -1563,6 +1563,50 @@ fail: > > } > > EXPORT_SYMBOL_GPL(gpio_set_pullup); > > > > +/** > > + * gpio_set_deglitch - sets @deglitch for a @gpio > > + * @gpio: the gpio to set deglitch > > + * @deglitch: deglitch level > > + */ > > +int gpio_set_deglitch(unsigned gpio, unsigned deglitch) > > sounds a lot like debounce, what's the difference ? deglitch allow you to filter the fact that the line take time to be stable go to 1 and 0
debounce will set 2 different threshold for changing the state from 0 to 1 and invertly
Best Regards, J.
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