[PATCH v5 4/9] spi: Add API to count spi acpi resources

Stefan Binding
2022-01-21T14:33:53Z

Some ACPI nodes may have more than one Spi Resource.
To be able to handle these case, its necessary to have
a way of counting these resources.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
---
drivers/spi/spi.c | 40 ++++++++++++++++++++++++++++++++++++++++
include/linux/spi/spi.h | 1 +
2 files changed, 41 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 06c0a308b38b..ec9f2ed579e3 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2324,6 +2324,46 @@ struct acpi_spi_lookup {
int index;
};

+static int acpi_spi_count(struct acpi_resource *ares, void *data)
+{
+ struct acpi_resource_spi_serialbus *sb;
+ int *count = data;
+
+ if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
+ return 1;
+
+ sb = &ares->data.spi_serial_bus;
+ if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_SPI)
+ return 1;
+
+ *count = *count + 1;
+
+ return 1;
+}
+
+/**
+ * acpi_spi_count_resources - Count the number of SpiSerialBus resources
+ * @adev: ACPI device
+ *
+ * Returns the number of SpiSerialBus resources in the ACPI-device's
+ * resource-list; or a negative error code.
+ */
+int acpi_spi_count_resources(struct acpi_device *adev)
+{
+ LIST_HEAD(r);
+ int count = 0;
+ int ret;
+
+ ret = acpi_dev_get_resources(adev, &r, acpi_spi_count, &count);
+ if (ret < 0)
+ return ret;
+
+ acpi_dev_free_resource_list(&r);
+
+ return count;
+}
+EXPORT_SYMBOL_GPL(acpi_spi_count_resources);
+
static void acpi_spi_parse_apple_properties(struct acpi_device *dev,
struct acpi_spi_lookup *lookup)
{
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index e5bbb9cbd3d7..394b4241d989 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -764,6 +764,7 @@ extern void spi_unregister_controller(struct spi_controller *ctlr);
extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
struct acpi_device *adev,
int index);
+int acpi_spi_count_resources(struct acpi_device *adev);
#endif

/*
--
2.25.1