From mboxrd@z Thu Jan 1 00:00:00 1970 From: Weike Chen Subject: [PATCH 3/4 v3] GPIO: gpio-dwapb: Support Debounce Date: Tue, 9 Sep 2014 11:08:00 -0700 Message-ID: <1410286081-16653-4-git-send-email-alvin.chen@intel.com> References: <1410286081-16653-1-git-send-email-alvin.chen@intel.com> Return-path: Received: from mga02.intel.com ([134.134.136.20]:51732 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756149AbaIIKQn (ORCPT ); Tue, 9 Sep 2014 06:16:43 -0400 In-Reply-To: <1410286081-16653-1-git-send-email-alvin.chen@intel.com> Sender: linux-gpio-owner@vger.kernel.org List-Id: linux-gpio@vger.kernel.org To: Linus Walleij , Alexandre Courbot , Grant Likely , Rob Herring , atull Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Boon Leong Ong , Hock Leong Kweh , Darren Hart , Sebastian Andrzej Siewior , Mika Westerberg , Andriy Shevchenko , Alvin Chen , Arnd Bergmann This patch enables 'debounce' for the designware GPIO, and it is based on Josef Ahmad's previous work. Reviewed-by: Hock Leong Kweh Reviewed-by: Shevchenko, Andriy Signed-off-by: Weike Chen --- drivers/gpio/gpio-dwapb.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c index c78a878..a90afb9 100644 --- a/drivers/gpio/gpio-dwapb.c +++ b/drivers/gpio/gpio-dwapb.c @@ -37,6 +37,7 @@ #define GPIO_INTTYPE_LEVEL 0x38 #define GPIO_INT_POLARITY 0x3c #define GPIO_INTSTATUS 0x40 +#define GPIO_PORTA_DEBOUNCE 0x48 #define GPIO_PORTA_EOI 0x4c #define GPIO_EXT_PORTA 0x50 #define GPIO_EXT_PORTB 0x54 @@ -235,6 +236,29 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type) return 0; } +static int dwapb_gpio_set_debounce(struct gpio_chip *gc, + unsigned offset, unsigned debounce) +{ + struct bgpio_chip *bgc = to_bgpio_chip(gc); + struct dwapb_gpio_port *port = + container_of(bgc, struct dwapb_gpio_port, bgc); + struct dwapb_gpio *gpio = port->gpio; + unsigned long flags, val_deb; + unsigned long mask = bgc->pin2mask(bgc, offset); + + spin_lock_irqsave(&bgc->lock, flags); + + val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE); + if (debounce) + dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, mask | val_deb); + else + dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ~mask & val_deb); + + spin_unlock_irqrestore(&bgc->lock, flags); + + return 0; +} + static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id) { u32 worked; @@ -373,6 +397,10 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio, port->bgc.gc.ngpio = pp->ngpio; port->bgc.gc.base = pp->gpio_base; + /* Only port A support debounce */ + if (pp->idx == 0) + port->bgc.gc.set_debounce = dwapb_gpio_set_debounce; + if (pp->irq) dwapb_configure_irqs(gpio, port, pp); -- 1.7.9.5