linux-kernel - [PATCH v2 1/3] pinctrl: stm32: set pin to gpio input when used as interrupt

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Message-ID: <1496074653-2941-2-git-send-email-alexandre.torgue@st.com>
Date:   Mon, 29 May 2017 18:17:31 +0200
From:   Alexandre TORGUE <alexandre.torgue@...com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Patrice Chotard <patrice.chotard@...com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Rob Herring <robh+dt@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>
Subject: [PATCH v2 1/3] pinctrl: stm32: set pin to gpio input when used as interrupt

This patch ensures that pin is correctly set as gpio input when it is used
as an interrupt.

Signed-off-by: Alexandre TORGUE <alexandre.torgue@...com>

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index d3c5f5d..5a15c7d 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -219,12 +219,41 @@ static int stm32_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
 	.to_irq			= stm32_gpio_to_irq,
 };
 
+static int stm32_gpio_irq_request_resources(struct irq_data *irq_data)
+{
+	struct stm32_gpio_bank *bank = irq_data->domain->host_data;
+	struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
+	int ret;
+
+	ret = stm32_gpio_direction_input(&bank->gpio_chip, irq_data->hwirq);
+	if (ret)
+		return ret;
+
+	ret = gpiochip_lock_as_irq(&bank->gpio_chip, irq_data->hwirq);
+	if (ret) {
+		dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n",
+			irq_data->hwirq);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void stm32_gpio_irq_release_resources(struct irq_data *irq_data)
+{
+	struct stm32_gpio_bank *bank = irq_data->domain->host_data;
+
+	gpiochip_unlock_as_irq(&bank->gpio_chip, irq_data->hwirq);
+}
+
 static struct irq_chip stm32_gpio_irq_chip = {
 	.name           = "stm32gpio",
 	.irq_eoi	= irq_chip_eoi_parent,
 	.irq_mask       = irq_chip_mask_parent,
 	.irq_unmask     = irq_chip_unmask_parent,
 	.irq_set_type   = irq_chip_set_type_parent,
+	.irq_request_resources = stm32_gpio_irq_request_resources,
+	.irq_release_resources = stm32_gpio_irq_release_resources,
 };
 
 static int stm32_gpio_domain_translate(struct irq_domain *d,
@@ -248,15 +277,6 @@ static void stm32_gpio_domain_activate(struct irq_domain *d,
 	struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
 
 	regmap_field_write(pctl->irqmux[irq_data->hwirq], bank->bank_nr);
-	gpiochip_lock_as_irq(&bank->gpio_chip, irq_data->hwirq);
-}
-
-static void stm32_gpio_domain_deactivate(struct irq_domain *d,
-				       struct irq_data *irq_data)
-{
-	struct stm32_gpio_bank *bank = d->host_data;
-
-	gpiochip_unlock_as_irq(&bank->gpio_chip, irq_data->hwirq);
 }
 
 static int stm32_gpio_domain_alloc(struct irq_domain *d,
@@ -285,7 +305,6 @@ static int stm32_gpio_domain_alloc(struct irq_domain *d,
 	.alloc          = stm32_gpio_domain_alloc,
 	.free           = irq_domain_free_irqs_common,
 	.activate	= stm32_gpio_domain_activate,
-	.deactivate	= stm32_gpio_domain_deactivate,
 };
 
 /* Pinctrl functions */
-- 
1.9.1