linux-kernel - [PATCH 1/2] input: adp5588-keys - get value from data out when dir out

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Message-Id: <1334935921-13016-1-git-send-email-jeff.dagenais@gmail.com>
Date:	Fri, 20 Apr 2012 11:32:00 -0400
From:	Jean-François Dagenais <jeff.dagenais@...il.com>
To:	grant.likely@...retlab.ca, dtor@...l.ru, dmitry.torokhov@...il.com,
	linus.walleij@...ricsson.com, linux-kernel@...r.kernel.org
Cc:	linux-input@...r.kernel.org, michael.hennerich@...log.com,
	Jean-François Dagenais <jeff.dagenais@...il.com>
Subject: [PATCH 1/2] input: adp5588-keys - get value from data out when dir out

As discussed here: http://ez.analog.com/message/35852,
the 5587 revC and 5588 revB spec sheets contain a mistake
in the GPIO_DAT_STATx register description.

According to R.Shnell at ADI, as well as my own
observations, it should read:
"GPIO data status (shows GPIO state when read for inputs)".

This commit changes the get value function accordingly.

A similar patch for gpio-adp5588 follows.

Signed-off-by: Jean-François Dagenais <jeff.dagenais@...il.com>
Acked-by: Michael Hennerich <michael.hennerich@...log.com>
---
 drivers/input/keyboard/adp5588-keys.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/input/keyboard/adp5588-keys.c b/drivers/input/keyboard/adp5588-keys.c
index 6412ced..b7a0f1a 100644
--- a/drivers/input/keyboard/adp5588-keys.c
+++ b/drivers/input/keyboard/adp5588-keys.c
@@ -78,6 +78,13 @@ static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
 	unsigned int bank = ADP5588_BANK(kpad->gpiomap[off]);
 	unsigned int bit = ADP5588_BIT(kpad->gpiomap[off]);
 
+	mutex_lock(&kpad->gpio_lock);
+	if (kpad->dir[bank] & bit) {
+		int result = !!(kpad->dat_out[bank] & bit);
+		mutex_unlock(&kpad->gpio_lock);
+		return result;
+	}
+	mutex_unlock(&kpad->gpio_lock);
 	return !!(adp5588_read(kpad->client, GPIO_DAT_STAT1 + bank) & bit);
 }
 
-- 
1.7.9

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