linux-kernel - [PATCH 1/1] [INPUT/KEYPAD] gpio keypad: Replace current blackfin specific pfbutton driver with kernel generic gpio key driver

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Message-Id: <1210587437-9751-1-git-send-email-cooloney@kernel.org>
Date:	Mon, 12 May 2008 18:17:17 +0800
From:	Bryan Wu <cooloney@...nel.org>
To:	dbrownell@...rs.sourceforge.net, dmitry.torokhov@...il.com,
	philipp.zabel@...il.com
Cc:	linux-kernel@...r.kernel.org,
	Michael Hennerich <michael.hennerich@...log.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 1/1] [INPUT/KEYPAD] gpio keypad: Replace current blackfin specific pfbutton driver with kernel generic gpio key driver

From: Michael Hennerich <michael.hennerich@...log.com>

It's an actual deficiency in the hardware that we can't address,
so it needs to be worked around in software.

Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
 drivers/input/keyboard/gpio_keys.c |   15 ++++++++++++++-
 1 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index bbd00c3..d856eb9 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -26,6 +26,18 @@
 
 #include <asm/gpio.h>
 
+#if defined(CONFIG_BLACKFIN) && !defined(BF548_FAMILY)
+
+/*
+ * On some Blackfin CPUs reading edge triggered
+ * GPIOs doesn't return the current value
+ */
+
+#define GPIOKEYS_EDGE_SENSE(x) set_gpio_edge(gpio, x)
+#else
+#define GPIOKEYS_EDGE_SENSE(x) do {} while (0)
+#endif
+
 static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
 {
 	int i;
@@ -39,8 +51,9 @@ static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
 
 		if (irq == gpio_to_irq(gpio)) {
 			unsigned int type = button->type ?: EV_KEY;
+			GPIOKEYS_EDGE_SENSE(0);
 			int state = (gpio_get_value(gpio) ? 1 : 0) ^ button->active_low;
-
+			GPIOKEYS_EDGE_SENSE(1);
 			input_event(input, type, button->code, !!state);
 			input_sync(input);
 			return IRQ_HANDLED;
-- 
1.5.5

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