path: root/drivers/input/matrix-keymap.c
diff options
authorSimon Glass <sjg@chromium.org>2013-02-25 14:08:40 -0800
committerSamuel Ortiz <sameo@linux.intel.com>2013-04-05 11:20:13 +0200
commit43840415339f1600f281211cfb5400fab696536e (patch)
tree8626b6b605073a39004fa932d2065c36d53f5731 /drivers/input/matrix-keymap.c
parenta17d94f0b6e1581391378dcb11c18ddebf6dcf8e (diff)
input: matrix-keymap: Add function to read the new DT binding
We now have a binding which adds two parameters to the matrix keypad DT node. This is separate from the GPIO-driven matrix keypad binding, and unfortunately incompatible, since that uses row-gpios/col-gpios for the row and column counts. So the easiest option here is to provide a function for non-GPIO drivers to use to decode the binding. Note: We could in fact create an entirely separate structure to hold these two fields, but it does not seem worth it, yet. If we have more parameters then we can add this, and then refactor each driver to hold such a structure. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Tested-by: Sourav Poddar <sourav.poddar@ti.com> (v2) Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/input/matrix-keymap.c')
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/input/matrix-keymap.c b/drivers/input/matrix-keymap.c
index 3ae496ea5fe6..619b3824563c 100644
--- a/drivers/input/matrix-keymap.c
+++ b/drivers/input/matrix-keymap.c
@@ -50,6 +50,25 @@ static bool matrix_keypad_map_key(struct input_dev *input_dev,
#ifdef CONFIG_OF
+int matrix_keypad_parse_of_params(struct device *dev,
+ unsigned int *rows, unsigned int *cols)
+ struct device_node *np = dev->of_node;
+ if (!np) {
+ dev_err(dev, "missing DT data");
+ return -EINVAL;
+ }
+ of_property_read_u32(np, "keypad,num-rows", rows);
+ of_property_read_u32(np, "keypad,num-columns", cols);
+ if (!*rows || !*cols) {
+ dev_err(dev, "number of keypad rows/columns not specified\n");
+ return -EINVAL;
+ }
+ return 0;
static int matrix_keypad_parse_of_keymap(const char *propname,
unsigned int rows, unsigned int cols,
struct input_dev *input_dev)

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