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[220.235.109.115]) by smtp.gmail.com with ESMTPSA id w14sm14671842pge.56.2019.10.20.07.44.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 20 Oct 2019 07:44:03 -0700 (PDT) From: Kent Gibson To: linux-gpio@vger.kernel.org, bgolaszewski@baylibre.com, linus.walleij@linaro.org, bamv2005@gmail.com Cc: drew@pdp7.com, Kent Gibson Subject: [PATCH v3 2/5] gpiolib: add support for pull up/down to lineevent_create Date: Sun, 20 Oct 2019 22:42:35 +0800 Message-Id: <20191020144238.14080-3-warthog618@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191020144238.14080-1-warthog618@gmail.com> References: <20191020144238.14080-1-warthog618@gmail.com> MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch adds support for pull up/down to lineevent_create. Use cases include receiving asynchronous presses from a push button without an external pull up/down. The patch also restricts the application of bias to lines explicitly requested as inputs to prevent bias being applied to as-is line requests. Signed-off-by: Kent Gibson --- drivers/gpio/gpiolib.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 604dc17b3207..eef964417521 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -554,6 +554,12 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip) (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))) return -EINVAL; + /* PULL_UP and PULL_DOWN flags only make sense for input mode. */ + if (!(lflags & GPIOHANDLE_REQUEST_INPUT) && + ((lflags & GPIOHANDLE_REQUEST_PULL_UP) || + (lflags & GPIOHANDLE_REQUEST_PULL_DOWN))) + return -EINVAL; + lh = kzalloc(sizeof(*lh), GFP_KERNEL); if (!lh) return -ENOMEM; @@ -944,6 +950,10 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) set_bit(FLAG_ACTIVE_LOW, &desc->flags); + if (lflags & GPIOHANDLE_REQUEST_PULL_DOWN) + set_bit(FLAG_PULL_DOWN, &desc->flags); + if (lflags & GPIOHANDLE_REQUEST_PULL_UP) + set_bit(FLAG_PULL_UP, &desc->flags); ret = gpiod_direction_input(desc); if (ret)