Modify struct i2c_acpi_lookup and i2c_acpi_fill_info() to allow
using them to get the info from a certain index in the ACPI-resource
list rather then taking the first I2cSerialBus resource.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
Changes in v2:
-No changes
Changes in v3:
-Increment number of found i2c busses for lookup-by-index after checking
the acpi-resource is an i2c bus rather then before
Changes in v4:
-No changes
---
drivers/i2c/i2c-core.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index d2402bb..f7faa99 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -112,6 +112,8 @@ struct i2c_acpi_lookup {
acpi_handle adapter_handle;
acpi_handle device_handle;
acpi_handle search_handle;
+ int n;
+ int index;
u32 speed;
u32 min_speed;
};
@@ -130,6 +132,9 @@ static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
return 1;
+ if (lookup->index != -1 && lookup->n++ != lookup->index)
+ return 1;
+
status = acpi_get_handle(lookup->device_handle,
sb->resource_source.string_ptr,
&lookup->adapter_handle);
@@ -182,6 +187,7 @@ static int i2c_acpi_get_info(struct acpi_device *adev,
memset(&lookup, 0, sizeof(lookup));
lookup.info = info;
+ lookup.index = -1;
ret = i2c_acpi_do_lookup(adev, &lookup);
if (ret)
@@ -328,6 +334,7 @@ u32 i2c_acpi_find_bus_speed(struct device *dev)
lookup.search_handle = ACPI_HANDLE(dev);
lookup.min_speed = UINT_MAX;
lookup.info = &dummy;
+ lookup.index = -1;
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
I2C_ACPI_MAX_SCAN_DEPTH,
--
2.9.3
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