linux-kernel - [PATCH 06/21] gpio: ab8500: Add api to enable pulldown

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Message-Id: <1355501979-1157-7-git-send-email-lee.jones@linaro.org>
Date:	Fri, 14 Dec 2012 16:19:24 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	linus.walleij@...aro.org,
	Mian Yousaf Kaukab <mian.yousaf.kaukab@...ricsson.com>,
	Lee Jones <lee.jones@...aro.org>,
	Bibek Basu <bibek.basu@...ricsson.com>
Subject: [PATCH 06/21] gpio: ab8500: Add api to enable pulldown

From: Mian Yousaf Kaukab <mian.yousaf.kaukab@...ricsson.com>

Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Bibek Basu <bibek.basu@...ricsson.com>
Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@...ricsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@...ricsson.com>
Tested-by: Jonas ABERG <jonas.aberg@...ricsson.com>
---
 drivers/gpio/gpio-ab8500.c             |   17 +++++++++++++++++
 include/linux/mfd/abx500/ab8500-gpio.h |    3 +++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpio/gpio-ab8500.c b/drivers/gpio/gpio-ab8500.c
index dd95cb3..b71bb72 100644
--- a/drivers/gpio/gpio-ab8500.c
+++ b/drivers/gpio/gpio-ab8500.c
@@ -507,6 +507,23 @@ static int __devexit ab8500_gpio_remove(struct platform_device *pdev)
 	return 0;
 }
 
+int ab8500_config_pulldown(struct device *dev,
+				enum ab8500_pin gpio, bool enable)
+{
+	u8 offset =  gpio - AB8500_PIN_GPIO1;
+	u8 pos = offset % 8;
+	u8 val = enable ? 0 : 1;
+	u8 reg = AB8500_GPIO_PUD1_REG + (offset / 8);
+	int ret;
+
+	ret = abx500_mask_and_set_register_interruptible(dev,
+				AB8500_MISC, reg, 1 << pos, val << pos);
+	if (ret < 0)
+		dev_err(dev, "%s write failed\n", __func__);
+	return ret;
+}
+EXPORT_SYMBOL(ab8500_config_pulldown);
+
 /*
  * ab8500_gpio_config_select()
  *
diff --git a/include/linux/mfd/abx500/ab8500-gpio.h b/include/linux/mfd/abx500/ab8500-gpio.h
index 94e85ca..48325db 100644
--- a/include/linux/mfd/abx500/ab8500-gpio.h
+++ b/include/linux/mfd/abx500/ab8500-gpio.h
@@ -67,6 +67,9 @@ enum ab8500_pin {
 	AB8500_PIN_GPIO42,
 };
 
+int ab8500_config_pulldown(struct device *dev,
+				enum ab8500_pin gpio, bool enable);
+
 int ab8500_gpio_config_select(struct device *dev,
 				enum ab8500_pin gpio, bool gpio_select);
 
-- 
1.7.9.5

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