linux-kernel - [PATCH v2 1/3] gpio: pcf857x: change to devm_request_threaded

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Message-ID: <1377859713-13460-2-git-send-email-george.cherian@ti.com>
Date:	Fri, 30 Aug 2013 16:18:31 +0530
From:	George Cherian <george.cherian@...com>
To:	<linus.walleij@...aro.org>
CC:	<linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <kuninori.morimoto.gx@...esas.com>,
	<n.a.balandin@...il.com>, George Cherian <george.cherian@...com>
Subject: [PATCH v2 1/3] gpio: pcf857x: change to  devm_request_threaded_irq

Remove the request_irq and use devm_request_threaded_irq
also cleanup free_irq. devm_* takes care of that.

Signed-off-by: George Cherian <george.cherian@...com>
---
 arch/arm/boot/dts/dra7-evm.dts |  2 +-
 drivers/gpio/gpio-pcf857x.c    | 28 ++++++++++++++++++++++++----
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
index 8b0738a..39b44bc 100644
--- a/arch/arm/boot/dts/dra7-evm.dts
+++ b/arch/arm/boot/dts/dra7-evm.dts
@@ -65,7 +65,7 @@
 		n_latch = <0x1408>;
 		gpio-controller;
 		#gpio-cells = <2>;
-		interrupt-parent = <&pcf_20>;
+		interrupt-parent = <&gpio20>;
 		interrupts = <14 2>;
 		interrupt-controller;
 		#interrupt-cells = <2>;
diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index 947cff4..4d0d28c 100644
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -191,6 +191,25 @@ static int pcf857x_to_irq(struct gpio_chip *chip, unsigned offset)
 	return irq_create_mapping(gpio->irq_domain, offset);
 }
 
+static irqreturn_t pcf857x_irq(int irq, void *data)
+{
+	struct pcf857x  *gpio = data;
+	unsigned long change, i, status, flags;
+
+	status = gpio->read(gpio->client);
+
+	spin_lock_irqsave(&gpio->slock, flags);
+
+	change = gpio->status ^ status;
+	for_each_set_bit(i, &change, gpio->chip.ngpio)
+		generic_handle_irq(irq_find_mapping(gpio->irq_domain, i));
+	gpio->status = status;
+
+	spin_unlock_irqrestore(&gpio->slock, flags);
+
+	return IRQ_HANDLED;
+}
+
 static void pcf857x_irq_demux_work(struct work_struct *work)
 {
 	struct pcf857x *gpio = container_of(work,
@@ -241,8 +260,6 @@ static void pcf857x_irq_domain_cleanup(struct pcf857x *gpio)
 	if (gpio->irq_domain)
 		irq_domain_remove(gpio->irq_domain);
 
-	if (gpio->irq)
-		free_irq(gpio->irq, gpio);
 }
 
 static int pcf857x_irq_domain_init(struct pcf857x *gpio,
@@ -258,8 +275,11 @@ static int pcf857x_irq_domain_init(struct pcf857x *gpio,
 		goto fail;
 
 	/* enable real irq */
-	status = request_irq(client->irq, pcf857x_irq_demux, 0,
-			     dev_name(&client->dev), gpio);
+	status = devm_request_threaded_irq(&client->dev, client->irq,
+				NULL, pcf857x_irq, IRQF_ONESHOT |
+				IRQF_TRIGGER_FALLING,
+				dev_name(&client->dev), gpio);
+
 	if (status)
 		goto fail;
 
-- 
1.8.1.4

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