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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

Reviewed-by: Mika Westerberg <>
Signed-off-by: Charles Keepax <>

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.


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 */
- 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;


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