linux-kernel - [PATCH v4 2/7] i2c: acpi: Use available IRQ helper functions

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Date:   Tue, 11 Jun 2019 13:30:56 +0100
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     <wsa@...-dreams.de>, <mika.westerberg@...ux.intel.com>
CC:     <jarkko.nikula@...ux.intel.com>,
        <andriy.shevchenko@...ux.intel.com>, <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 v4 2/7] 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.

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
---

No changes since v3.

Apologies Andy but I really can't see a sensible way to split this
patch up. I have tried moving the resource_list_for_each_loop
into a function in one patch then switching to using
acpi_dev_resource_interrupt and i2c_dev_irq_from_resource, but the
function is basically a completely different function ie. all the
arguments are different and the purpose is different. So it makes
no sense, and it is very ping pong. I tried doing the switch to
i2c_dev_irq_from_resources as a separate patch which isn't so bad,
but feels pointless as it is such a small change, let me know if you
really want me to send that version.

Basically the switch to the helper function and the use of
acpi_dev_resource_interrupt are intrinsically linked, so there isn't
really a sensible way to split those up. If you still want some
changes I am afraid you will have to be more specific in what you are
looking for.

Thanks,
Charles

 drivers/i2c/i2c-core-acpi.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index f1d648962b223..47d5b1c5ec9e0 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -133,14 +133,25 @@ 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_info(struct acpi_device *adev,
 			     struct i2c_board_info *info,
 			     struct i2c_adapter *adapter,
 			     acpi_handle *adapter_handle)
 {
 	struct list_head resource_list;
-	struct resource_entry *entry;
 	struct i2c_acpi_lookup lookup;
+	int irq = -ENOENT;
 	int ret;

 	memset(&lookup, 0, sizeof(lookup));
@@ -172,16 +183,13 @@ static int i2c_acpi_get_info(struct acpi_device *adev,

 	/* Then fill IRQ number if any */
 	INIT_LIST_HEAD(&resource_list);
-	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) {
-			info->irq = entry->res->start;
-			break;
-		}
-	}
+	if (irq > 0)
+		info->irq = irq;

 	acpi_dev_free_resource_list(&resource_list);

-- 
2.11.0