[PATCH 06/11] Input: synaptics-rmi4 - Add rmi_find_function()

[Benjamin Tissoires <benjamin.tissoires@redhat.com>]

If a function needs to communicate with an other, it's better to have
a way to retrieve this other.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
 drivers/input/rmi4/rmi_driver.c | 13 +++++++++++++
 drivers/input/rmi4/rmi_driver.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index faa295e..304f142 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -181,6 +181,19 @@ int rmi_process_interrupt_requests(struct rmi_device *rmi_dev)
 }
 EXPORT_SYMBOL_GPL(rmi_process_interrupt_requests);
 
+struct rmi_function *rmi_find_function(struct rmi_device *rmi_dev, u8 number)
+{
+	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
+	struct rmi_function *entry;
+
+	list_for_each_entry(entry, &data->function_list, node) {
+		if (entry->fd.function_number == number)
+			return entry;
+	}
+
+	return NULL;
+}
+
 static int suspend_one_function(struct rmi_function *fn)
 {
 	struct rmi_function_handler *fh;
diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h
index a7cb383..e4be773 100644
--- a/drivers/input/rmi4/rmi_driver.h
+++ b/drivers/input/rmi4/rmi_driver.h
@@ -95,6 +95,7 @@ bool rmi_register_desc_has_subpacket(const struct rmi_register_desc_item *item,
 bool rmi_is_physical_driver(struct device_driver *);
 int rmi_register_physical_driver(void);
 void rmi_unregister_physical_driver(void);
+struct rmi_function *rmi_find_function(struct rmi_device *rmi_dev, u8 number);
 
 char *rmi_f01_get_product_ID(struct rmi_function *fn);
 
-- 
2.5.5