[PATCHv5 1/2] drivers: input: keypad: Add device tree support

[Sourav Poddar]

Update the Documentation with omap4 keypad device tree
binding information.
Add device tree support for omap4 keypad driver.

Tested on omap4430 sdp.

Cc: Benoit Cousson <b-cousson@xxxxxx>
Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
Cc: Felipe Balbi <balbi@xxxxxx>
Cc: Dmitry Torokhov <dtor@xxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
Signed-off-by: Sourav Poddar <sourav.poddar@xxxxxx>
---
changes since v4:
- Developed it on top of dmitry's 'next' branch due to
dependency on generic "matrix_keypad_build_keymap" api 
patches queued in that branch
- Adapted the driver to fill "keymap" in device tree
using "matrix_keypad_build_keymap" api defined in
drivers/input/matrix-keymap.c
 .../devicetree/bindings/input/omap-keypad.txt      |   31 ++++++
 drivers/input/keyboard/omap4-keypad.c              |  108 +++++++++++++++-----
 2 files changed, 111 insertions(+), 28 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/input/omap-keypad.txt

diff --git a/Documentation/devicetree/bindings/input/omap-keypad.txt b/Documentation/devicetree/bindings/input/omap-keypad.txt
new file mode 100644
index 0000000..722425b
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/omap-keypad.txt
@@ -0,0 +1,31 @@
+* TI's Keypad Controller device tree bindings
+
+TI's Keypad controller is used to interface a SoC with a matrix-type
+keypad device. The keypad controller supports multiple row and column lines.
+A key can be placed at each intersection of a unique row and a unique column.
+The keypad controller can sense a key-press and key-release and report the
+event using a interrupt to the cpu.
+
+Required SoC Specific Properties:
+- compatible: should be one of the following
+   - "ti,omap4-keypad": For controllers compatible with omap4 keypad
+      controller.
+
+Required Board Specific Properties, in addition to those specified by
+the shared matrix-keyboard bindings:
+- keypad,num-rows: Number of row lines connected to the keypad
+  controller.
+
+- keypad,num-columns: Number of column lines connected to the
+  keypad controller.
+
+Optional Properties specific to linux:
+- linux,keypad-no-autorepeat: do no enable autorepeat feature.
+
+Example:
+        keypad@4ae1c000{
+                compatible = "ti,omap4-keypad";
+                keypad,num-rows = <2>;
+                keypad,num-columns = <8>;
+		linux,keypad-no-autorepeat;
+	};
diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
index aed5f69..d5a2d1a 100644
--- a/drivers/input/keyboard/omap4-keypad.c
+++ b/drivers/input/keyboard/omap4-keypad.c
@@ -27,6 +27,7 @@
 #include <linux/platform_device.h>
 #include <linux/errno.h>
 #include <linux/io.h>
+#include <linux/of.h>
 #include <linux/input.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
@@ -75,6 +76,7 @@ enum {
 
 struct omap4_keypad {
 	struct input_dev *input;
+	struct matrix_keymap_data *keymap_data;
 
 	void __iomem *base;
 	unsigned int irq;
@@ -84,6 +86,7 @@ struct omap4_keypad {
 	u32 reg_offset;
 	u32 irqreg_offset;
 	unsigned int row_shift;
+	bool no_autorepeat;
 	unsigned char key_state[8];
 	unsigned short keymap[];
 };
@@ -208,25 +211,74 @@ static void omap4_keypad_close(struct input_dev *input)
 	pm_runtime_put_sync(input->dev.parent);
 }
 
+static struct omap4_keypad *omap_keypad_parse_dt(struct device *dev,
+				uint32_t rows, uint32_t cols,
+				struct input_dev *input_dev)
+{
+	struct device_node *np = dev->of_node;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
+	int error;
+
+	error = matrix_keypad_build_keymap(NULL, "linux,keymap",
+				rows, cols, keypad_data->keymap, input_dev);
+	if (error) {
+		dev_err(&pdev->dev, "failed to build keymap\n");
+		input_free_device(input_dev);
+	}
+
+	if (of_get_property(np, "linux,input-no-autorepeat", NULL))
+		keypad_data->no_autorepeat = true;
+
+	return keypad_data;
+}
+
 static int __devinit omap4_keypad_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
 	const struct omap4_keypad_platform_data *pdata;
 	struct omap4_keypad *keypad_data;
 	struct input_dev *input_dev;
 	struct resource *res;
 	resource_size_t size;
-	unsigned int row_shift, max_keys;
+	unsigned int row_shift = 0, max_keys = 0;
+	uint32_t num_rows = 0, num_cols = 0;
 	int rev;
 	int irq;
 	int error;
 
 	/* platform data */
 	pdata = pdev->dev.platform_data;
-	if (!pdata) {
+	if (np) {
+		of_property_read_u32(np, "keypad,num-rows", &num_rows);
+		of_property_read_u32(np, "keypad,num-columns", &num_cols);
+		if (!num_rows || !num_cols) {
+			dev_err(&pdev->dev, "number of keypad rows/columns not specified\n");
+			return -EINVAL;
+		}
+	} else if (pdata) {
+		num_rows = pdata->rows;
+		num_cols = pdata->cols;
+	} else {
 		dev_err(&pdev->dev, "no platform data defined\n");
 		return -EINVAL;
 	}
 
+	row_shift = get_count_order(num_cols);
+	max_keys = num_rows << row_shift;
+
+	keypad_data = devm_kzalloc(dev, sizeof(struct omap4_keypad) +
+			max_keys * sizeof(keypad_data->keymap[0]),
+				GFP_KERNEL);
+
+	if (!keypad_data) {
+		dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, keypad_data);
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "no base address specified\n");
@@ -239,22 +291,6 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	if (!pdata->keymap_data) {
-		dev_err(&pdev->dev, "no keymap data defined\n");
-		return -EINVAL;
-	}
-
-	row_shift = get_count_order(pdata->cols);
-	max_keys = pdata->rows << row_shift;
-
-	keypad_data = kzalloc(sizeof(struct omap4_keypad) +
-				max_keys * sizeof(keypad_data->keymap[0]),
-			      GFP_KERNEL);
-	if (!keypad_data) {
-		dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
-		return -ENOMEM;
-	}
-
 	size = resource_size(res);
 
 	res = request_mem_region(res->start, size, pdev->name);
@@ -271,10 +307,10 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
 		goto err_release_mem;
 	}
 
+	keypad_data->rows = num_rows;
+	keypad_data->cols = num_cols;
 	keypad_data->irq = irq;
 	keypad_data->row_shift = row_shift;
-	keypad_data->rows = pdata->rows;
-	keypad_data->cols = pdata->cols;
 
 	/*
 	* Enable clocks for the keypad module so that we can read
@@ -322,15 +358,25 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
 	input_dev->open = omap4_keypad_open;
 	input_dev->close = omap4_keypad_close;
 
-	error = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
-					   pdata->rows, pdata->cols,
-					   keypad_data->keymap, input_dev);
-	if (error) {
-		dev_err(&pdev->dev, "failed to build keymap\n");
-		goto err_free_input;
+	if (np) {
+		keypad_data = omap_keypad_parse_dt(&pdev->dev,
+				keypad_data->rows, keypad_data->cols,
+				input_dev);
+	} else {
+		keypad_data->keymap_data =
+			(struct matrix_keymap_data *)pdata->keymap_data;
+		error = matrix_keypad_build_keymap(keypad_data->keymap_data,
+				NULL, keypad_data->rows, keypad_data->cols,
+				keypad_data->keymap, input_dev);
+		if (error) {
+			dev_err(&pdev->dev, "failed to build keymap\n");
+			goto err_free_input;
+		}
 	}
 
-	__set_bit(EV_REP, input_dev->evbit);
+	if (!keypad_data->no_autorepeat)
+		__set_bit(EV_REP, input_dev->evbit);
+
 	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 
 	input_set_drvdata(input_dev, keypad_data);
@@ -351,7 +397,6 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
 		goto err_pm_disable;
 	}
 
-	platform_set_drvdata(pdev, keypad_data);
 	return 0;
 
 err_pm_disable:
@@ -392,12 +437,19 @@ static int __devexit omap4_keypad_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id omap_keypad_dt_match[] = {
+	{ .compatible = "ti,omap4-keypad" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
+
 static struct platform_driver omap4_keypad_driver = {
 	.probe		= omap4_keypad_probe,
 	.remove		= __devexit_p(omap4_keypad_remove),
 	.driver		= {
 		.name	= "omap4-keypad",
 		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(omap_keypad_dt_match),
 	},
 };
 module_platform_driver(omap4_keypad_driver);
-- 
1.7.1

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