linux-kernel - [PATCH 2/5] i2c: acpi: Use available IRQ helper functions

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Message-ID: <20190520084936.10590-3-ckeepax@opensource.cirrus.com>
Date:   Mon, 20 May 2019 09:49:33 +0100
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     <wsa@...-dreams.de>, <mika.westerberg@...ux.intel.com>
CC:     <linux-i2c@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <benjamin.tissoires@...hat.com>,
        <jbroadus@...il.com>, <patches@...nsource.cirrus.com>
Subject: [PATCH 2/5] i2c: acpi: Use available IRQ helper functions

Use the available IRQ helper functions, most of the functions have
additional helpful side affects like configuring the trigger type of the
IRQ.

Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
---
 drivers/i2c/i2c-core-acpi.c | 23 ++++++++++++++---------
 drivers/i2c/i2c-core-base.c |  4 ++--
 drivers/i2c/i2c-core.h      |  2 ++
 3 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index c3ac3ea184317..764cd10420a74 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -137,25 +137,30 @@ static int i2c_acpi_do_lookup(struct acpi_device *adev,
 	return 0;
 }
 
+static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
+{
+	int *irq = data;
+	struct resource r;
+
+	if (*irq < 0 && acpi_dev_resource_interrupt(ares, 0, &r))
+		*irq = i2c_dev_irq_from_resources(&r, 1);
+
+	return 1; /* No need to add resource to the list */
+}
+
 static int i2c_acpi_get_irq(struct acpi_device *adev, int *irq)
 {
 	struct list_head resource_list;
-	struct resource_entry *entry;
 	int ret;
 
 	INIT_LIST_HEAD(&resource_list);
+	*irq = -ENOENT;
 
-	ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
+	ret = acpi_dev_get_resources(adev, &resource_list,
+				     i2c_acpi_add_resource, &irq);
 	if (ret < 0)
 		return -EINVAL;
 
-	resource_list_for_each_entry(entry, &resource_list) {
-		if (resource_type(entry->res) == IORESOURCE_IRQ) {
-			*irq = entry->res->start;
-			break;
-		}
-	}
-
 	acpi_dev_free_resource_list(&resource_list);
 
 	return 0;
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index d389d4fb0623a..84bf11b25a120 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -687,8 +687,8 @@ static void i2c_dev_set_name(struct i2c_adapter *adap,
 		     i2c_encode_flags_to_addr(client));
 }
 
-static int i2c_dev_irq_from_resources(const struct resource *resources,
-				      unsigned int num_resources)
+int i2c_dev_irq_from_resources(const struct resource *resources,
+			       unsigned int num_resources)
 {
 	struct irq_data *irqd;
 	int i;
diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h
index c88cfef813431..8f3a08dc73a25 100644
--- a/drivers/i2c/i2c-core.h
+++ b/drivers/i2c/i2c-core.h
@@ -28,6 +28,8 @@ extern struct list_head	__i2c_board_list;
 extern int		__i2c_first_dynamic_bus_num;
 
 int i2c_check_7bit_addr_validity_strict(unsigned short addr);
+int i2c_dev_irq_from_resources(const struct resource *resources,
+			       unsigned int num_resources);
 
 /*
  * We only allow atomic transfers for very late communication, e.g. to send
-- 
2.11.0