linux-kernel - [PATCH 5/5] irq: generic-chip: provide devm_irq_setup_generic

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Message-Id: <1496246820-13250-6-git-send-email-brgl@bgdev.pl>
Date:   Wed, 31 May 2017 18:07:00 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Jonathan Corbet <corbet@....net>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: [PATCH 5/5] irq: generic-chip: provide devm_irq_setup_generic_chip()

Provide a resource managed variant of irq_setup_generic_chip().

Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
---
 Documentation/driver-model/devres.txt |  1 +
 include/linux/irq.h                   |  3 ++
 kernel/irq/devres.c                   | 52 +++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index d473be8..6a6618f 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -312,6 +312,7 @@ IRQ
   devm_irq_alloc_desc_from()
   devm_irq_alloc_descs_from()
   devm_irq_alloc_generic_chip()
+  devm_irq_setup_generic_chip()
 
 LED
   devm_led_classdev_register()
diff --git a/include/linux/irq.h b/include/linux/irq.h
index c6e70e9..4006ba1 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -956,6 +956,9 @@ struct irq_chip_generic *
 devm_irq_alloc_generic_chip(struct device *dev, const char *name, int num_ct,
 			    unsigned int irq_base, void __iomem *reg_base,
 			    irq_flow_handler_t handler);
+int devm_irq_setup_generic_chip(struct device *dev, struct irq_chip_generic *gc,
+				u32 msk, enum irq_gc_flags flags,
+				unsigned int clr, unsigned int set);
 
 struct irq_chip_generic *irq_get_domain_generic_chip(struct irq_domain *d, unsigned int hw_irq);
 
diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
index 21ee0ae..194c506 100644
--- a/kernel/irq/devres.c
+++ b/kernel/irq/devres.c
@@ -231,4 +231,56 @@ devm_irq_alloc_generic_chip(struct device *dev, const char *name, int num_ct,
 	return gc;
 }
 EXPORT_SYMBOL_GPL(devm_irq_alloc_generic_chip);
+
+struct irq_generic_chip_devres {
+	struct irq_chip_generic *gc;
+	u32 msk;
+	unsigned int clr;
+	unsigned int set;
+};
+
+static void devm_irq_remove_generic_chip(struct device *dev, void *res)
+{
+	struct irq_generic_chip_devres *this = res;
+
+	irq_remove_generic_chip(this->gc, this->msk, this->clr, this->set);
+}
+
+/**
+ * devm_irq_setup_generic_chip - Setup a range of interrupts with a generic
+ *                               chip for a managed device
+ *
+ * @dev:	Device to setup the generic chip for
+ * @gc:		Generic irq chip holding all data
+ * @msk:	Bitmask holding the irqs to initialize relative to gc->irq_base
+ * @flags:	Flags for initialization
+ * @clr:	IRQ_* bits to clear
+ * @set:	IRQ_* bits to set
+ *
+ * Set up max. 32 interrupts starting from gc->irq_base. Note, this
+ * initializes all interrupts to the primary irq_chip_type and its
+ * associated handler.
+ */
+int devm_irq_setup_generic_chip(struct device *dev, struct irq_chip_generic *gc,
+				u32 msk, enum irq_gc_flags flags,
+				unsigned int clr, unsigned int set)
+{
+	struct irq_generic_chip_devres *dr;
+
+	dr = devres_alloc(devm_irq_remove_generic_chip,
+			  sizeof(*dr), GFP_KERNEL);
+	if (!dr)
+		return -ENOMEM;
+
+	irq_setup_generic_chip(gc, msk, flags, clr, set);
+
+	dr->gc = gc;
+	dr->msk = msk;
+	dr->clr = clr;
+	dr->set = set;
+	devres_add(dev, dr);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_irq_setup_generic_chip);
 #endif /* CONFIG_GENERIC_IRQ_CHIP */
-- 
2.9.3