From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755830Ab1KYOLn (ORCPT ); Fri, 25 Nov 2011 09:11:43 -0500 Received: from 8.mo2.mail-out.ovh.net ([188.165.52.147]:39964 "EHLO mo2.mail-out.ovh.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755785Ab1KYOLa (ORCPT ); Fri, 25 Nov 2011 09:11:30 -0500 From: Jean-Christophe PLAGNIOL-VILLARD To: linux-kernel@vger.kernel.org Cc: Jean-Christophe PLAGNIOL-VILLARD , Nicolas Ferre , Grant Likely X-Ovh-Mailout: 178.32.228.2 (mo2.mail-out.ovh.net) Subject: [PATCH 2/2] gpiolib: introduce gpio_set_deglitch Date: Fri, 25 Nov 2011 15:08:40 +0100 Message-Id: <1322230120-14120-2-git-send-email-plagnioj@jcrosoft.com> X-Mailer: git-send-email 1.7.2.3 In-Reply-To: <1322230120-14120-1-git-send-email-plagnioj@jcrosoft.com> References: <1322230120-14120-1-git-send-email-plagnioj@jcrosoft.com> X-Ovh-Tracer-Id: 11676707935440382744 X-Ovh-Remote: 213.251.161.87 (ns32433.ovh.net) X-Ovh-Local: 213.186.33.20 (ns0.ovh.net) X-OVH-SPAMSTATE: OK X-OVH-SPAMSCORE: -100 X-OVH-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeefiedrudduucetggdotefuucfrrhhofhhilhgvmecuqfggjfenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephffvufffkffojghfsedttdertdertddtnecuhfhrohhmpeflvggrnhdqvehhrhhishhtohhphhgvucfrnfetiffpkffqnfdqggfknffnteftffcuoehplhgrghhnihhojhesjhgtrhhoshhofhhtrdgtohhmqeenucffohhmrghinhepne X-Spam-Check: DONE|U 0.5/N X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -230 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeefhedrudehucetggdotefuucfrrhhofhhilhgvmecuqfggjfenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnehlihhnuhigfeigucdlqdeftddmnehvohhiugdpihhnthculddquddttddm Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org this will allow to manage the Glitch Input Filter as present on AT91 as example Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD Cc: Nicolas Ferre Cc: Grant Likely --- 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) +{ + unsigned long flags; + struct gpio_chip *chip; + struct gpio_desc *desc = &gpio_desc[gpio]; + int status = -EINVAL; + + spin_lock_irqsave(&gpio_lock, flags); + + if (!gpio_is_valid(gpio)) + goto fail; + chip = desc->chip; + if (!chip || !chip->set_deglitch) + goto fail; + gpio -= chip->base; + if (gpio >= chip->ngpio) + goto fail; + status = gpio_ensure_requested(desc, gpio); + if (status < 0) + goto fail; + + /* now we know the gpio is valid and chip won't vanish */ + + spin_unlock_irqrestore(&gpio_lock, flags); + + might_sleep_if(chip->can_sleep); + + return chip->set_deglitch(chip, gpio, deglitch); + +fail: + spin_unlock_irqrestore(&gpio_lock, flags); + if (status) + pr_debug("%s: gpio-%d status %d\n", + __func__, gpio, status); + + return status; +} +EXPORT_SYMBOL_GPL(gpio_set_deglitch); + /* I/O calls are only valid after configuration completed; the relevant * "is this a valid GPIO" error checks should already have been done. * diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 085ef16..20a9786 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -110,6 +110,9 @@ struct gpio_chip { int (*set_pullup)(struct gpio_chip *chip, unsigned offset, unsigned pullup); + int (*set_deglitch)(struct gpio_chip *chip, + unsigned offset, unsigned deglitch); + void (*set)(struct gpio_chip *chip, unsigned offset, int value); @@ -159,6 +162,7 @@ extern int gpio_direction_output(unsigned gpio, int value); extern int gpio_set_debounce(unsigned gpio, unsigned debounce); extern int gpio_set_pullup(unsigned gpio, unsigned pullup); +extern int gpio_set_deglitch(unsigned gpio, unsigned deglitch); extern int gpio_get_value_cansleep(unsigned gpio); extern void gpio_set_value_cansleep(unsigned gpio, int value); diff --git a/include/linux/gpio.h b/include/linux/gpio.h index 5c786e7..bfbc3d7 100644 --- a/include/linux/gpio.h +++ b/include/linux/gpio.h @@ -95,6 +95,11 @@ static inline int gpio_set_pullup(unsigned gpio, unsigned pullup) return -ENOSYS; } +static inline int gpio_set_deglitch(unsigned gpio, unsigned deglitch) +{ + return -ENOSYS; +} + static inline int gpio_get_value(unsigned gpio) { /* GPIO can never have been requested or set as {in,out}put */ -- 1.7.7