[PATCH 2/2] i2c/ACPI: Don't ignore IRQ flags

[Srinivas Pandruvada <srinivas.pandruvada-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

Currently irq flags from IRQ resources are ignored. They have important
IRQ configuration for level, trigger and sharable.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
 drivers/i2c/i2c-core.c | 6 +++++-
 include/linux/i2c.h    | 4 ++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index a69a7b4..cb72629 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1093,6 +1093,7 @@ struct i2c_resource_info {
 	unsigned short flags[MAX_CRS_ELEMENTS];
 	int count;
 	int common_irq;
+	int common_irq_flags;
 };
 
 static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data)
@@ -1116,8 +1117,10 @@ static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data)
 	} else if (rcs_info->common_irq < 0) {
 		struct resource r;
 
-		if (acpi_dev_resource_interrupt(ares, 0, &r))
+		if (acpi_dev_resource_interrupt(ares, 0, &r)) {
 			rcs_info->common_irq = r.start;
+			rcs_info->common_irq_flags = r.flags;
+		}
 	}
 
 	/* Tell the ACPI core to skip this resource */
@@ -1157,6 +1160,7 @@ static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
 
 	adev->power.flags.ignore_parent = true;
 	info.irq = rcs_info.common_irq;
+	info.irq_flags = rcs_info.common_irq_flags;
 	for (i = 0; i < rcs_info.count; ++i) {
 		if (!rcs_info.addr[i])
 			continue;
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index ce75c73..cea41ab 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -207,6 +207,7 @@ struct i2c_driver {
  * @adapter: manages the bus segment hosting this I2C device
  * @dev: Driver model device node for the slave.
  * @irq: indicates the IRQ generated by this device (if any)
+ * @irq_flags: indicates the IRQ flags (format: IORESOURCE_IRQ_XXXX)
  * @detected: member of an i2c_driver.clients list or i2c-core's
  *	userspace_devices list
  *
@@ -223,6 +224,7 @@ struct i2c_client {
 	struct i2c_adapter *adapter;	/* the adapter we sit on	*/
 	struct device dev;		/* the device structure		*/
 	int irq;			/* irq issued by device		*/
+	unsigned long irq_flags;	/* irq flags by device		*/
 	struct list_head detected;
 };
 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
@@ -256,6 +258,7 @@ static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
  * @of_node: pointer to OpenFirmware device node
  * @acpi_node: ACPI device node
  * @irq: stored in i2c_client.irq
+ * @irq_flags: indicates the IRQ flags (format: IORESOURCE_IRQ_XXXX)
  *
  * I2C doesn't actually support hardware probing, although controllers and
  * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
@@ -277,6 +280,7 @@ struct i2c_board_info {
 	struct device_node *of_node;
 	struct acpi_dev_node acpi_node;
 	int		irq;
+	unsigned long irq_flags;
 };
 
 /**
-- 
1.7.11.7